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Title:
A TRANSPARENT OPTICAL DEVICE ELEMENT COMPRISING MEANS FOR SELECTIVELY TRANSMITTING ELECTROMAGNETIC RADIATION
Document Type and Number:
WIPO Patent Application WO/2019/002565
Kind Code:
A1
Abstract:
The present invention relates to transparent optical device elements comprising means for selectively transmitting electromagnetic radiation. Furthermore, the present invention relates to a camera comprising one or more of the transparent optical device elements and to a phone casing comprising such a camera.

Inventors:
HENRIKSEN, Lars (Planetveien 6, Tønsberg, N-3113, NO)
TALLARON, Nicolas (6 Montée Bonafous, Lyon, F-69004, FR)
CRAEN, Pierre (40 chemin du carmel, Embourg, B-4053, BE)
Application Number:
EP2018/067613
Publication Date:
January 03, 2019
Filing Date:
June 29, 2018
Export Citation:
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Assignee:
POLIGHT AS (Kongeveien 77, Horten, N-3188, NO)
International Classes:
G02B1/04; G02B3/12; G02B3/14; G02C7/10; H04M1/02
Domestic Patent References:
WO2008150817A12008-12-11
WO2008035983A12008-03-27
Foreign References:
EP2781939A12014-09-24
US20130293772A12013-11-07
Other References:
None
Attorney, Agent or Firm:
PLOUGMANN VINGTOFT A/S (Strandvejen 70, 2900 Hellerup, 2300, DK)
Download PDF:
Claims:
CLAIMS

1. A camera module (CM) comprising atransparent optical device element, wherein said transparent optical device element comprises:

- at least one deformable lens body ;

- a bendable transparent cover member in contact with a first surface of said at least one deformable lens body;

- actuators, for shaping said bendable transparent cover member into a desired shape, said actuators located on a top surface of said bendable transparent cover member,

wherein said at least one deformable lens body has

o (a) an elastic modulus larger than 300 Pa;

o (b) the refractive index is above 1.35 ;

- one or more means for selectively transmitting electromagnetic radiation passing through said deformable lens body.

2. A CM according to claim 1, wherein said deformable lens body comprises:

o a polymer network of cross-linked or partly cross-linked polymers; o a miscible oil or combination of oils. 3. A CM according to any of the claims 1 or 2, wherein said one or more means for selectively transmitting electromagnetic radiation is in contact with a second surface of said at least one deformable lens body, said second surface being opposite to said first surface. 4. A CM according to any of the preceding claims, wherein said one or more means for selectively transmitting electromagnetic radiation is in contact with said first surface of said at least one deformable lens body.

5. A CM according to any of the preceding claims, wherein said bendable transparent cover member comprises said one or more means for selectively transmitting electromagnetic radiation.

6. A CM according to any of the preceding claims, wherein said at least one deformable lens body comprises said one or more means for selectively transmitting electromagnetic radiation.

7. A CM according to any of the preceding claims 2-6, wherein said polymer network of cross-linked or partly cross-linked polymers comprises said one or more means for selectively transmitting electromagnetic radiation.

8. A CM according to any of the preceding claims 2-7, wherein said miscible oil or combination of oils comprises said one or more means for selectively transmitting electromagnetic radiation. 9. A CM according to any of the preceding claims, wherein said one or more means for selectively transmitting electromagnetic radiation is an optical filter, such as an absorptive filter, an interference filter or a dichroic filter.

10. A CM according to any of the preceding claims, wherein said at least one deformable lens body has

o (c) the absorbance in the visible range less than 10% per millimetre thickness of said deformable lens body.

11. A CM according to any of the preceding claims, wherein said one or more means for selectively transmitting electromagnetic radiation has a cut-off wavelength in the range between 0,55 μηη and 0.75 μΠΊ .

12. A CM according to any of the preceding claims, wherein said one or more means for selectively transmitting electromagnetic radiation has a bandwidth of 0.5 μΓΠ .

13. A CM according to any of the preceding claims, wherein said one or more means for selectively transmitting electromagnetic radiation, has an absorbance in the range between 0.75 to 7 μηη higher than 10% per millimetre thickness.

14. A CM according to any of the preceding claims, wherein said one or more means for selectively transmitting electromagnetic radiation is or comprise a dye or a pigment.

15. A CM according to claim 14, wherein said dye is an organic dye.

16. A CM according to any of the preceding claims, wherein said one or more means for selectively transmitting electromagnetic radiation is or comprise cynine dyes, such as phthalocyanines, naphthalocyanines or carbocyanines, or a

5 combination thereof.

17. A CM according to any of the preceding claims, wherein said one or more means for selectively transmitting electromagnetic radiation is or comprise metal phthalocyanines such as Copper Phthalocynine or Zinc Phthalocynine or a

10 combination thereof.

18. A CM according to any of the preceding claims, wherein said one or more means for selectively transmitting electromagnetic radiation is or comprise organometallic complexes comprising transition or post transition metals such as

15 Ni, Co, Ga, Ti, Mn, Zn, In, Cu or a combination thereof.

19. A CM according to any of the preceding claims 9-18, wherein said optical filter is a substrate in contact with said at least one deformable lens body.

20 20. A CM according to to any of the preceding claims, wherein said substrate is a cover glass of said camera.

21. A phone casing comprising said camera according to any of the preceding claims.

Description:
A TRANSPARENT OPTICAL DEVICE ELEMENT COMPRISING MEANS FOR

SELECTIVELY TRANSMITTING ELECTROMAGNETIC RADIATION

The present invention relates to transparent optical device elements comprising means for selectively transmitting electromagnetic radiation . Furthermore, the present invention relates to a Camera Module (CM) comprising one or more of the transparent optical device elements and to a phone casing comprising such a CM .

BACKGROUND OF THE INVENTION

Smart mobile phone thickness is crucially dependent on the components contained into mobile phone housing . Within these components, mobile phone thickness is generally limited by the thickness of the main integrated CM . This generally sets the minimum thickness of the smart phones.

In red ucing smart phone thickness is thus of critical importance to red uce thickness of integrated CM .

Hence, there is a clear need for solutions reducing the thickness of integrated CM in smart phones.

Current integ rated CM solutions includes auto focus features provided by VCM (Voice Coil Motor) systems. These solutions are not optimal as increasing the thickness of CM by several millimetres due to the need of moving the lens along the optical axis to provide correct focus.

Alternative solutions may employ tuneable lenses, such as Polight TLens®. TLens® has several advantages over VCM, such as faster response time, lower power consumption, constant field of view, higher optical axis stability and smaller footprint, enabling an easier integration of CM in smart phones.

Furthermore, TLens® impact on CM thickness is lower since TLens® are thinner than current VCM solutions.

However, improvements towards even thinner solutions are needed to enhance

CM integration in thinner smart phones.

Indeed solutions that allow the red uction between 0.2 to 0.4 mm of total thickness of CM may be very valuable in reducing the total thickness of smart phones. Current solutions employing tuneable lenses of VCM are generally implemented by positioning the tuneable lenses in between the CM and the cover glass of the phone casing. The cover glass of the phone casing may be a blue glass. The use of blue glasses add a further disadvantage namely introduces moist sensitive elements that due to low stability towards moist may reduce the lifetime of the CM and in turn of the smart phone.

Hence, an improved transparent optical device element suitable for reducing thickness of CM would be advantageous, and in particular, a transparent optical device element overcoming the drawbacks of current blue glass solutions applied to phone casing would be advantageous.

OBJECT OF THE INVENTION

An object of the current invention is to reduce total thickness of smart phones. A further object of the current invention is to reduce thickness of CM integrated into smart phones.

An object of the current invention is to improve versatility and reduce and/or avoid the disadvantages of current means for selectively transmitting

electromagnetic radiation, such as Infra-Red (IR) filters, applied to transparent optical device elements and CM.

It is an object of the present invention to wholly or partly overcome the above disadvantages and drawbacks of the prior art.

In particular, it may be seen as a further object of the present invention to provide a solution that solves the above mentioned problems of the prior art in reducing thickness of CM by applying means for selectively transmitting electromagnetic radiation applied to transparent optical device elements integrated in a CM.

More specifically, it is an object of the current invention to overcome the low stability towards moist of current blue glass filter applied to transparent optical device elements. A further object of the present invention is to provide an alternative to the prior art.

SUMMARY OF THE INVENTION

Thus, the above described object and several other objects are intended to be obtained in a first aspect of the invention by providing a transparent optical device element comprising : at least one deformable lens body; a bendable transparent cover member in contact with a first surface of the at least one deformable lens body; actuators for shaping the bendable transparent cover member into a desired shape, the actuators located on a top surface of the bendable transparent cover member, wherein the at least one deformable lens body has: (a) an elastic modulus larger than 300 Pa, thereby avoiding deformation due to gravitational forces in normal operation of the transparent optical device element; (b) the refractive index is above 1.35. The transparent optical device element comprises also one or more means for selectively transmitting electromagnetic radiation passing through the deformable lens body.

The at least one deformable lens body may be surrounded by a sidewall.

The idea of the invention is based on the inclusion of one or more means for selectively transmitting electromagnetic radiation within a transparent optical device element. This allows for integration in CM allowing reduction of the thickness of the CM.

In general, the invention provides advantages on reducing complexity and costs of transparent optical device elements.

The invention improves versatility and reduces and/or avoids the disadvantages of current means for selectively transmitting electromagnetic radiation applied to transparent optical device elements, such as blue glass filters, which have been shown having very low stability towards moist.

The current invention propose an alternative solution to the use of standard current means for selectively transmitting electromagnetic radiation applied to transparent optical device elements.

In particular, the current invention proposes to substitute the blue glass filters with either a dye or a pigment in the lens body, i.e. within its bulk, or by coating the first or second surface of the lens body. In some embodiments, the dye or a pigment may be coated or contained within a substrate or a back window on which the lens body mig ht be supported . In some embodiments, the dye or a pigment may be coated or contained within the bendable transparent cover member.

This solution allows for an easier and better integration of a transparent optical device, such as a TLens®, in a CM .

The at least one deformable, non-fluid lens body is preferably made from an elastic material . Since the lens body is non-fluid, no tight enclosure is needed to hold the lens body, and there are no risk of leakage . In a preferred embod iment, the lens body is made from a soft polymer, which may include a number of different materials, such as silicone, polymer gels, a polymer network of cross- linked or partly cross-linked polymers, and a miscible oil or combination of oils. Using a soft polymer makes it possible to produce lenses where the polymer is in contact with air, thus requiring much less force when adjusting the focal length of the lens. It also eases the production, as the polymer will keep in place even if the different production steps are localized in d ifferent positions or facilities. As mentioned above it also makes it possible to provide leakage channels or bubbles of compressible gas in order to reduce the required force necessary to adjust the lens and to reduce the strains caused by temperature and pressure fluctuations in the environment.

Thus, in some embodiments, the deformable lens body comprises a polymer network of cross-linked or partly cross-linked polymers and a miscible oil or combination of oils. In some further embod iments, the polymer network of cross-linked or partly cross-linked polymers comprises the one or more means for selectively

transmitting electromagnetic radiation .

In some other embodiments, the miscible oil or combination of oils comprises the one or more means for selectively transmitting electromagnetic rad iation . To keep the lens body in place, and to focus its deformation to the regions just under the cover membrane, the lens assembly may further comprises structural elements adapted to restrain the change of shape of a part of the lens body opposite the cover membrane. These structural elements may be located on the back window and in contact with the lens body.

These structural elements may be one or more rods or pillars of a material having a refractive index identical or similar to the lens body. However, the structural element has a different material parameter, e.g . a Young's modulus higher than the lens body.

In some embodiments, these structural elements may be central members positioned within or adjacent to the lens body and on the optical axis. The central member may cause the lens body to provide a radial variation in reaction forces from the lens body when the bendable transparent cover member is actuated in the second direction, the reaction forces decreasing with increasing radius. This radial variation may be a result of:

- a variation in the stiffness of the lens body, in which case the central member may be part of the lens body having a different material parameter (e.g .

Young's modulus);

- a object different from and stiffer than the lens body positioned within the lens body and centred on the optical axis;

- a radial variation in the thickness of the lens body caused by a central member being stiffer than the lens body and positioned below the lens body to impress a centre-symmetric concave shape in the end of the lens body facing the back window.

The effect of all these implementations is that the central part of the lens body will feel stiffer when pushed at from above, and this stiffer 'core' of the lens body is a pivot point and support for the central region of the lens cover.

The sidewall surrounds the lens body and may be in contact with the lens body.

The bendable transparent cover member is in contact with, such as attached to, the first surface of the at least one deformable lens body. The cover member or membrane may be floating on the lens body, possibly held in place by the actuators depending on how these are designed to attach to or engage with the cover member.

The cover member may be a thin and flexible glass membrane having flat or curved surface.

The actuators may be different type of actuators, e.g. piezoelectric actuators, having the function of shaping the bendable transparent cover member so as to provide focus adjustment and image stabilisation.

Another type of actuators may preferably each involve a coil and a magnet, and the addressing of an actuator involves drawing a current through the coil.

Young's modulus, also known as the tensile modulus or called the elastic modulus, being the most common elastic modulus, is a measure of the stiffness of an elastic material. It is defined as the ratio of the uniaxial stress over the uniaxial strain in the range of stress. In solid mechanics, the slope of the stress-strain curve at any point is called the tangent modulus. The tangent modulus of the initial, linear portion of a stress-strain curve is called Young's modulus (E). It can be

experimentally determined from the slope of a stress-strain curve created during tensile tests conducted on a sample of the material.

For applications of the deformable lens body in an adjustable autofocus camera lens, there will be a minimum required stiffness or modulus. The device must withstand significant deformation due to gravity and gravitational forces that might occur during the working life of the autofocus camera. The inventors have observed that a shear modulus of larger than 100 Pa is required.

Thus, the elastic modulus should be above a desired minimum value of 300 Pa, thereby avoiding deformation due to gravitational forces in normal operation of the transparent optical device element. According to the relation above the preferred range of shear modulus between 100 Pa and 100 KPa gives a preferred range of the elastic modulus between 300 Pa and 300 KPa. In search for controlling, such as reducing the hardness or stiffness of a polymer network, a solution of the invention may be to introd uce variations in the polymer chain so as to obtain polymers network with reduced shear modulus. Since a lens by definition is refracting the light, thereby changing for example the focal point of light passing through it, having a controlled refractive index is crucial . In order to make a more efficient refraction of light, both with respect to the physical dimensions of the lens and for adjustable lenses, to have a large change in refraction at various positions of the lens, it is often highly

advantageous to have a high refractive index. It is advantageous to have a hig h refractive index of the flexible lens body, since hig her change in refraction is achieved with a given actuation .

However, polymers having a hig h refractive index may not have the mechanical properties required for being employed in a lens.

In some embodiments, the refractive index ratio between the transparent polymer network of cross-linked or partly cross-linked polymers and the oil or combination of oils is between 0.8 and 1.

In some further embodiments, the d ifference in refractive index ratio between the transparent polymer network of cross-linked or partly cross-linked polymers and the oil or combination of oils is between 0.01 and 0.30.

In some even further embodiments, the oil or combination of oils has a refractive index that is at least 0.02 units higher than the refractive index of the transparent polymer network of cross-linked or partly cross-linked polymers.

Transparent is herein defined as having a high transmittance, or consequently a low absorbance, such as lower than 10% per mm in the visible range of the electromag netic spectrum . The visible range may include near infrared (N .I . R.) and at least part of the UV spectrum .

The invention is particularly, but not exclusively, advantageous for obtaining a transparent optical device element having a high refractive index, RI. The refractive index is the measure for the speed of light in a material, relative to the speed of light in vacuum - a refractive index of 1.5 is for example equivalent to saying that the speed of light in that material is 50% less than in vacuum. The refractive index is an important physical parameter with practical use, especially in optics, where effects such as refraction and reflection both depend on the refractive index of materials and the interfaces of such materials. The refractive index is theoretically linked to the dielectric properties of the material. The dielectric properties are also very much correlated with the polarity of a chemical compound and also the miscibility of materials.

Generally the refractive index of a lens body is limited by the RI of the polymer used to produce the lens body, thus polymer with high RI are desired . However, these polymers generally do not have the desired properties so as to comply with the requirement for lens body to be used as adjustable optical lens.

According to the first aspect of the invention oil or a combination of oils are added to a polymer lens or a polymer composition for a lens to increase the RI of a lens body.

Introducing an oil or combination of oils into a polymer network of cross-linked or partially cross-linked polymers has also the great advantage of enhancing the refractive index of the polymer network used.

Preferably, the lens body should have a refractive index being as high as possible, e.g. in the range of 1.35-1.90. Accordingly, the refractive index of the lens body should be at least 1.35, e.g. in the range between 1.35-1.75, such as in the range between 1.35 and 1.55. In some further embodiments, the one or more means for selectively transmitting electromagnetic radiation is in contact with a second surface of the at least one deformable lens body, the second surface being opposite to said first surface.

The one or more means for selectively transmitting electromagnetic radiation passing through the deformable lens body may thus be located onto the second surface being opposite to the first surface.

In some other embodiments, the one or more means for selectively transmitting electromagnetic radiation is in contact with the first surface of the at least one deformable lens body. The one or more means for selectively transmitting electromagnetic radiation may be located onto the first surface of the at least one deformable lens body. In some embodiments, the bendable transparent cover member comprises the one or more means for selectively transmitting electromagnetic radiation, such as the one or more means for selectively transmitting electromagnetic radiation is coated onto one or more surfaces of the bendable transparent cover member. The one or more means for selectively transmitting electromagnetic radiation may be or be included in a coating deposited on the first and/or second surface of the at least one deformable lens body, and/or onto one or more surfaces of the bendable transparent cover member. The at least one deformable lens body may comprises the one or more means for selectively transmitting electromagnetic radiation.

The one or more means for selectively transmitting electromagnetic radiation may be within the bulk of the at least one deformable lens body. In some embodiments, the one or more means for selectively transmitting electromagnetic radiation is an optical filter, such as an absorptive filter, an interference filter or a dichroic filter.

In some embodiments the at least one deformable lens body has: (c) the absorbance in the visible range less than 10% per millimetre thickness of the deformable lens body.

The absorbance less than 10% per millimetre thickness of the deformable lens body may be in the visible region, such as between 0.4 μηη and 0.74 μΠΊ .

The one or more means for selectively transmitting electromagnetic radiation may act as a filter in the infrared region, such as below 7 μΠΊ, for example in the Near infrared (N.I.R.) region, for example between 0.75 and 1.4 μΠΊ . In some embodiments, the one or more means for selectively transmitting electromagnetic radiation has a cut-off wavelength in the range between 0,55 μηη and 0.75 μΠΊ, i.e. the wavelength at which the transmission decreases to 50% throughput in a high-pass or shortpass filter.

In some embodiments, the one or more means for selectively transmitting electromagnetic radiation has a transmittance lower than 10% in the wavelength range between 0.65 μηη and 1.5 μΓΠ . In some other embodiments, the one or more means for selectively transmitting electromagnetic radiation has a cut-on wavelength in the range between 0,55 μηη and 0.75 μΠΊ, i.e. the wavelength at which at which the transmission increases to 50% throughput in a low-pass or longpass filter. In some embodiments, the one or more means for selectively transmitting electromagnetic radiation has a transmittance lower than 10% in the wavelength range between 0.35 μηη and 0.65 μΓΠ .

In some further embodiments, the one or more means for selectively transmitting electromagnetic radiation has a bandwidth at 0.5 μΠΊ, i. e. the Full Width at Half Maximum (FWHM) in a bandpass filter.

In some other embodiments, the one or more means for selectively transmitting electromagnetic radiation has an absorbance between 0.75 to 7 μηη higher than 10% per millimetre thickness.

In some other embodiments, the one or more means for selectively transmitting electromagnetic radiation is or comprise a dye or a pigment. In some further embodiments, the dye is an organic dye.

The one or more means for selectively transmitting electromagnetic radiation may comprise azo compounds, cyanine dyes, anthraquinone, dihydrodiketo

anthracene, phthalocyanines, naphthalocyanines, carbocyanines, croconium dyes, squarylium dyes, thiophene based dyes or a combination thereof. Cyanine dyes may also comprise metal phthalocyanines such as Copper

Phthalocynine or Zinc Phthalocynine or a combination thereof.

Phthalocyanines are structurally related to other tetrapyrrole macrocyles including porphyrins and porphyrazines. Thus, cyanine dyes may also comprise tetrapyrrole macrocyles including porphyrins, metal porphyrins and porphyrazines. An example of metal porphyrin suitable to be used as means for selectively transmitting electromagnetic radiation

is chlorophyll or chlorophyll derived structured or a combination thereof.

Suitable dyes or pigments may be organometallic complexes comprising transition or post transition metals such as Ni, Co, Ga, Ti, Mn, Zn, In, Cu or a combination thereof.

For example, suitable organometallic complexes may be bis (dithiobenzil) nickel complex or bis((4-dimethylamino) dithiobenzil) nickel complex. Dyes and pigments may be modified so as to ensure the required solubility, e.g. to allow appropriate solubility into the silicone based polymer of the lens body, keeping the appropriate required softness of the lens body.

For example, azobiscyanopentanamide, croconium dyes squarylium dyes are used, and cyanine dyes have shown the potential of being incorporated in silicone polymer networks.

The required solubility may be minimal as the desired selective transmittance of electromagnetic radiation may be achieved at concentration of dye or pigments as low as 0.005% to reduce transmittance in the near infra red, i.e. between 800 and 1000 nm, to 60% on average.

In some other emdodiments, the required solubility may be minimal as the desired selective transmittance of electromagnetic radiation may be achieved at concentration of dye or pigments as low as 0.001% to reduce transmittance in the near infra red, i.e. between 800 and 1000 nm, to substantial zero% on average. In some embodiments, the combination of two or more dyes or pigments produces the desired reduction in transmittance due to complementary absorption of the two or more dyes or pigments.

In some further embodiments, the combination of at least one dye or pigment and an optical filter produces the desired reduction in transmittance due to complementary absorption of the at least one dye or pigment and the optical filter.

Optimization in incorporating dyes or pigments into silicone polymers could be directed towards solutions providing high index of refraction, appropriate softness and required IR absorption.

The back window is in contact with lens body.

The surface of the back window opposite the lens body may be concave or convex and improve the (de)focusing effect of the lens. The back window is preferably of high optical quality and preferably made from glass or regular optical plastic like polycarbonate.

The back window may form the cover glass for a device involving the lens assembly, such as a mobile phone camera. This will reduce the number of layers and improve the optical quality by reducing flare and improving transmittance. The back window may have an anti-reflect coating (ARC) and also provide an IR filter function, possibly combined with filtering properties of the lens body or of the bedable transparent cover member.

The back window is preferably a plane, transparent substrate of e.g . S1O2 or glass. The back window preferably has a flat surface facing the lens body. The opposite surface facing away from the lens body may be flat or may have a convex or concave, e.g. spherical shape to constitute a backside of the lens. In other embodiments, however, the back window might be a curved substrate, such as a spherical surface section as well as aspheric shape.

In another embodiment, the back window forms part of a transparent substrate of a touch screen. Such touch screens are standard in many electronic devices, such as a mobile phones, tablets, computer monitors, GPS, media players, watches, etc. Such a touch sensitive screen may be based on different touch screen technologies such as resistive systems, capacitive systems, surface acoustic wave systems, infrared systems, etc., all of which involves a transparent substrate at its base. In some further embodiments, the optical filter is a substrate in contact with the at least one deformable lens body.

One or more surface of the back window may be coated with the one or more means for selectively transmitting electromagnetic radiation.

In some further embodiments, one or more surface of the back window are further coated with multilayer coatings such as an ARC or other multilayer coatings. The presence of the multilayer coatings provide properties to the back windows which in turn allow for the absence of a cover blue glass when the transparent optical device element is integrated in a CM and in a phone casing.

In some embodiments, the one or more means for selectively transmitting electromagnetic radiation may be contained, thus within, the back window. In a second aspect, the invention relates to a camera or CM comprising the transparent optical device element according to the first aspect of the invention. The substrate in contact with the at least one deformable lens body may be a cover glass of the camera or CM. In a third aspect the invention relates to a phone casing comprising the camera according to the second aspect of the invention.

The first, second and other aspects and embodiments of the present invention may each be combined with any of the other aspects and embodiments. These and other aspects and embodiments of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.

BRIEF DESCRIPTION OF THE FIGURES

The transparent optical device element according to the invention will now be described in more detail with regard to the accompanying figures. The figures show one way of implementing the present invention and is not to be construed as being limiting to other possible embodiments falling within the scope of the attached claim set.

Figure 1 shows a schematic representation of a phone casing including a CM. Figure 2 shows a schematic representation of a transparent optical device element comprising a back window.

Figure 3 shows a schematic representation of a phone casing with an integrated CM and a transparent optical device element located onto the CM between the CM and the cover-glass of the phone casing and the CM.

Figure 4 a schematic representation of a transparent optical device element having a blue glass as back window substrate.

Figure 5 show a schematic representation of a phone casing with integrated CM and an integrated transparent optical device element wherein the back window substrate is an integrated cover blue glass of the phone casing.

Figure 6 shows transmittance spectra of a Polight TLens ® as in figure 2 having a Near Infra Red (NIR) filter as back window (solid line) and with a clear glass back window (dotted line).

Figure 7 shows transmittance spectra of Copper(II)phthalocyanine in a silicone based polymer.

Figure 8 shows an estimate of the transmittance spectra of

Copper(II)phthalocyanine in the pure 300μηΊ silicone based polymer.

DETAILED DESCRIPTION OF AN EMBODIMENT Figure 1 shows a schematic representation 1 of a CM 30 located inside a phone casing 3. The phone casing 3 has a front cover glass 2 allowing incident light to enter the phone casing and pass through the lens stack 7.

The CM 30 comprises auto focus features provided, for example by a VCM 5. The CM comprises also an I.R. filter 6, such as a blue glass located at the end of the lens stack 7 having the function of removing part of the visible and Near Infra Red component from the incident light before it reaches the sensor 8 located on a substrate 9.

Figure 1 shows a known assembly where a phone casing 3 comprises a CM 30. Figure 2 shows a schematic representation of a transparent optical device element 10, such as a Polight TLens ® .

The transparent optical device element illustrated in Figure 2 comprises a deformable lens body 15, actuators 11 arranged on a bedable transparent cover member sucha as a thin flexible glass member 14 supported by continuous or semi-continuous rigid sidewalls 12.

The deformable lens body 15 is in contact with the thin flexible glass member 14 on one side and a support 13, such as the device back window, on the opposite side.

The thin flexible glass member 14 and/or the support 13 may have a flat surface facing the lens body. The opposite surface facing away from the lens body of both glass surface 14 and support 13 may be flat or may have a convex or concave, e.g. spherical shape to constitute a backside of the lens. In other embodiments, the back window might be a curved substrate, such as a spherical surface section as well as aspheric shape.

Figure 3 shows a schematic representation of a phone casing 20 with an integrated CM as in figure 1 and a transparent optical device element 10 as in figure 2 located onto the CM between the CM and the cover-glass of the phone casing.

Figure 4 shows a schematic representation of a further embodiment of a transparent optical device element, such as a Polight TLens ® .

In figure 4 the transparent optical device element 16 comprises a deformable lens body 21, actuators 18 arranged on a thin, flexible glass surface or membrane 19 arranged in a package 22 wired 17 in the four corner to actuators 18 and the bedable transparent cover member 19.

The transparent optical device element 16 of figure 4 has as substrate 23 a blue glass. This allows for optimal integration of the transparent optical device element When integrated in a phone casing the substrate 23, i.e. the blue glass, of the transparent optical device element 16 of figure 4 will substitute the cover glass of the phone casing thus allowing for reduction of total thickness of the phone casing and potentially avoiding the need of a further IR filter between the lens stack and the below sensor.

Figure 5 show a schematic representation 24 according to the invention wherein the back window of a transparent optical device element integrated is the cover blue glass of a phone casing in which both a CM and the transparent optical device element are located.

Figure 6 shows transmittance spectra of a Polight TLens ® as in figure 2 having a Near Infra Red (NIR) filter as back window 26 and with a clear glass back window 25.

The Polight TLens ® showing transmittance spectrum 26 has as support a IR blue glass filter while the Polight TLens ® showing transmittance spectrum 25 has as support or a regular borosilicate glass. The spectra were obtained using a Cary 50 UV/VIS photospectrometer. The spectra clearly show the effect of the presence on the support of means for selectively transmitting electromagnetic radiation passing through the deformable lens body, i.e. the reduction of the transmittance of the light irradiation below 10% at wavelengthes above 685 nm. Figure 7 shows transmittance spectra of Copper(II)phthalocyanine in a silicone based polymer, such as a polymer network of cross-linked or partly cross-linked polymers and a miscible oil or combination of oils.

The spectra were collected from 10mm samples in glass cuvettes, without reference, i.e. the transmittance includes the reflectance and absorbance in the glass cuvette used.

The different spectra have been collected for samples having 0%, 0.005%.

0.01%, 0,025%, 0,05% and 0.1% w/w of Copper(II)phthalocyanine in the silicone based polymer. It can be noticed that already a minimum amount of 0.01% w/w of Copper(II)phthalocyanine desolved in the silicone based polymer allow for the reduction of the transmittance below 40% in the infrared range between 800 and 1100 nm .

Figure 8 shows an estimate of the transmittance spectra of

Copper(II)phthalocyanine in the pure 300μηΊ silicone based polymer assuming constant reflectance over wavelength, and disregarding absorbance due to the cuvette walls. The silicone based polymer, such as a polymer network of cross- linked or partly cross-linked polymers, may be a polydimethylsiloxane network, a poly-co(diphenyl dimethyl) siloxane network or a poly-co(d iphenyl dimethyl) siloxane networks. In some embodiments, the polymer network of cross-linked or partly cross-linked polymers is a polymer network of cross-linked or partly cross-linked polysiloxanes, such as vinyl-containing polysiloxanes containing between 2 and 5 vinyl groups per molecule. Vinyl-containing polysiloxanes can preferably be chosen from the group of polydimethyl siloxanes, poly(methyl phenyl) siloxanes, poly co-(dimethyl diphenyl) siloxanes, poly ter-(dimethyl diphenyl methylphenyl) siloxanes, containing between 2-5 vinyl groups per molecule.

Although the present invention has been described in connection with the specified embod iments, it should not be construed as being in any way limited to the presented examples. The scope of the present invention is set out by the accompanying claim set. In the context of the claims, the terms "comprising" or "comprises" do not exclude other possible elements or steps. Also, the mentioning of references such as "a" or "an" etc. should not be construed as exclud ing a plurality. The use of reference signs in the claims with respect to elements indicated in the fig ures shall also not be construed as limiting the scope of the invention . Furthermore, individual features mentioned in different claims, may possibly be advantageously combined, and the mentioning of these features in different claims does not exclude that a combination of features is not possible and advantageous.