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Title:
DEVICE FOR APPLYING A COSMETIC PRODUCT
Document Type and Number:
WIPO Patent Application WO/2015/086334
Kind Code:
A1
Abstract:
The invention relates to a device for applying a cosmetic product to a body surface of a user, of the type having: - a holder for gripping the device, - an applicator connected to a stem and intended to come into contact with the body surface of the user, - a motor housed in the holder and a means for converting the movement of the motor into a translational back-and-forth movement of the applicator, According to the invention, the back-and-forth movement of the applicator while it passes from its rest position, that is to say when the applicator is in its most retracted position, to its end-of-travel position along a longitudinal axis X-X' has a frequency of between 5 hertz and 50 hertz, an amplitude of movement of the applicator of preferably 2 mm to 20 mm and an average acceleration of the applicator of preferably between 3 m/s2 and 50 m/s2.

Inventors:
DURU, Nicolas (4 rue d'Arsonval, Paris, F-75015, FR)
JOLLET, Frédéric (4 rue du jeu de l'arc, Cressonsacq, F-60190, FR)
LIMONGI, Michel (61 rue d'Alsace, Clichy, F-92110, FR)
Application Number:
EP2014/075847
Publication Date:
June 18, 2015
Filing Date:
November 27, 2014
Export Citation:
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Assignee:
L'OREAL (14 rue Royale, Paris, Paris, F-75008, FR)
International Classes:
A46B13/02; A45D34/04
Domestic Patent References:
WO2013077284A12013-05-30
WO2006130644A22006-12-07
Foreign References:
JPS60109429U1985-07-25
KR20100060730A2010-06-07
Attorney, Agent or Firm:
KHAIRALLAH, Murielle (L'oreal, D.I.P.I.25-29 Quai Aulagnier, Asnieres-sur-Seine Cedex, F-92665, FR)
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Claims:
Claims

1 . Device (1 ) for applying a cosmetic product to a body surface of a user, of the type having:

- a holder for gripping (2) the device,

- an applicator (20) connected to a stem (24) and intended to come into contact with the body surface of the user,

- a motor (10) housed in the holder and a means for converting the movement of the motor (30) into a translational back-and-forth movement of the applicator, characterized in that the back-and-forth movement of the applicator while it passes from its rest position, that is to say when the applicator is in its most retracted position, to its end-of-travel position along a longitudinal axis X- X' has a frequency of between 5 hertz and 50 hertz, an amplitude of movement of the applicator of preferably 2 mm to 20 mm and an average acceleration of the applicator of preferably between 3 m/s2 and 50 m/s2.

2. Device according to Claim 1 , characterized in that the stiffness of the damper (70) of the applicator defined by its pressure force at a given distance is preferentially between 300 N/m and 2000 N/m, preferably around 800 N/m.

3. Device according to either of the preceding claims, characterized in that the applicator has a frequency of between 5 hertz and 50 hertz, preferably around 16 hertz.

4. Device according to any one of the preceding claims, characterized in that the amplitude of movement of the applicator is between 2 mm and 20 mm, preferably around 8 mm.

5. Device according to any one of the preceding claims, characterized in that the average acceleration of the applicator is between 3 m/s2 and 50 m/s2, preferably between 5 m/s2 and 20 m/s2, preferably around 7 m/s2.

6. Device according to any one of the preceding claims, characterized in that the motor sets an output shaft of the motor (14) into rotation about a longitudinal axis A-A' perpendicular to the axis X-X' and said output shaft of the motor subsequently drives a cam mechanism, connecting rod mechanism and/or gear mechanism.

7. Device according to any one of the preceding claims, characterized in that the conversion means is made up of elliptical gears.

8. Device according to Claim 7, characterized in that the stem of the applicator is connected to a secondary wheel (32) of the gears, at the periphery of the secondary wheel.

9. Device according to any one of the preceding claims, characterized in that the applicator comprises a flat surface (23) connected to a damper between the stem and the applicator so as to ensure damping during contact with the body surface of the user.

10. Device according to Claim 9, characterized in that the damper is a spring, a foam, a liquid or a gel.

1 1 . Method for applying a cosmetic product to a body surface of a user, comprising the following steps of:

- providing a device according to any one of the preceding claims,

- providing a cosmetic product, - applying the cosmetic product to the body surface with the aid of the device.

Description:
Device for applying a cosmetic product

The present invention relates to a device for applying a cosmetic product to a body surface of a user, and to the associated method. More specifically, the invention relates to a device having an applicator intended to come into contact with the body surface of the user while effecting back-and- forth movements.

The product applied by the device is in particular a makeup product, advantageously intended to be applied to the skin or body fibres of a user, such as the eyelashes or eyebrows.

In a variant, the cosmetic product is a care product, in particular a face cream or body cream formula, a shampoo, a hair mask, a makeup removing oil, a treatment oil, a cleansing cream, an exfoliant, a mask or a sunscreen.

More generally, the expression "cosmetic product" is understood to mean any product as defined in Regulation (EC) No 1223/2009 of the European Parliament and Council of 30 November 2009 relating to cosmetic products.

The device according to the invention is in particular intended to apply the cosmetic product to the body surface of the user or, by contrast, to cleanse this body surface with the aid of the cosmetic product.

In the former case, it is common to use passive application devices that have an applicator member on which the cosmetic product is disposed.

During the application of the product, the user manually moves the applicator member with respect to the body surface using different movements.

In order to apply makeup, the cosmetic product can be disposed on an applicator member, and the user taps on his skin with the aid of the applicator member in order to apply the product so as to carry out a touch up or care treatment.

In the prior art, there are devices that are capable of tapping on the body surface of the user. From a mechanical point of view, this tapping is generally achieved with the aid of a rotary cam that is intended to convert a rotary movement of a motor into a vibratory movement of an applicator along the tapping axis.

The document KR2010-0060730 describes a device of the abovementioned type, in which the cam has a surface with an elongate and rounded shape and is in permanent contact with the applicator.

However, if the applicator becomes blocked, this solution sometimes causes the motor to break. This can happen for example when the user stresses the applicator by pressing it.

Other types of devices that are suitable for producing oscillations or vibrations on the body surface of the user are also known.

The patent KR20120078856 describes a motorized toothbrush comprising a body, a motor housed in the body, a stem and an applicator fixed to the end of the stem. The motor is connected to a gear system that brings about a rotational movement of the applicator.

The document US5033150 describes a motorized toothbrush comprising an applicator and a stem inserted into a case. The case also comprises a rotating motor coupled to the stem. The rotational movement of the motor brings about an oscillating movement of the applicator.

The document WO2010095830 describes an electric mascara in which the mascara brush is made to move from left to right. The motor is connected to a gear system. One of the wheels has a protuberance which is inserted into a hole in the mascara brush, bringing about the movement thereof from left to right.

However, these devices are not satisfactory from a technical point of view because the applicator is made to rotate or oscillate and not to carry out a back-and-forth movement. The application of the product will not be homogeneous. Moreover, the movement does not reproduce the desired "whiplash" gestures, that is to say an extremely quick movement which allows a "whiplash" type application of product.

Therefore, the aim of our invention is to provide a makeup tool with a back-and-forth movement on the body surface of the user which is rapid, a tool made to carry out a movement which imitates the extremely quick gestures that are characteristic of "whiplash", an amplitude of movement of the applicator which is large, and damping of the applicator in order to obtain a "soft" effect. These four characteristics make it possible to best imitate human gestures during the application of makeup by tapping.

To this end, the invention proposes a device for applying a cosmetic product to a body surface of a user, of the type having:

- a holder for gripping the device,

- an applicator connected to a stem and intended to come into contact with the body surface of the user,

- a motor housed in the holder and a means for converting the

movement of the motor into a translational back-and-forth movement of the applicator,

According to the invention, the back-and-forth movement of the applicator while it passes from its rest position, that is to say when the applicator is in its most retracted position, to its end-of-travel position along a longitudinal axis X-X' has a frequency of between 5 hertz and 50 hertz, an amplitude of movement of the applicator of preferably 2 mm to 20 mm and an average acceleration of the applicator of preferably between 3 m/s 2 and 50 m/s 2 .

The stiffness of the damper of the applicator defined by its pressure force at a given distance may be preferentially between 300 N/m and 2000 N/m, preferably around 800 N/m.

The applicator may have a frequency of between 5 hertz and 50 hertz, preferably around 16 hertz.

The amplitude of movement of the applicator may be between 2 mm and 20 mm, preferably around 8 mm.

The average acceleration of the applicator may be between 3 m/s 2 and 50 m/s 2 , preferably between 5 m/s 2 and 20 m/s 2 , preferably around 7 m/s 2 .

All of these defined features make it possible to obtain an application of makeup that imitates human gestures. The motor may set an output shaft of the motor into rotation about a longitudinal axis A-A' perpendicular to the axis X-X' and said output shaft of the motor subsequently drives a cam mechanism, connecting rod mechanism and/or gear mechanism.

The conversion means may be made up of elliptical gears.

The stem of the applicator may be connected to a secondary wheel of the gears, at the periphery of the secondary wheel.

The applicator may comprise a flat surface connected to a damper between the stem and the applicator so as to ensure damping during contact with the body surface of the user.

The damper may be a spring, a foam, a liquid or a gel.

This damper makes it possible to obtain the same movement as that obtained by the user's gestures, that is to say slight damping of the applicator on the body surface of the user on account of the softness of the fingers.

A further subject of the invention is a method for applying a cosmetic product to a body surface of a user, comprising the following steps of:

- providing a device according to any one of the preceding claims,

- providing a cosmetic product,

- applying the cosmetic product to the body surface with the aid of the device.

The invention will be better understood on reading the following description, given solely by way of example, and with reference to the drawings, in which:

- Figure 1 is a profile view of the device for applying a cosmetic product according to one exemplary embodiment of the invention,

- Figure 2 is a sectional view of the inside of the device according to Figure 1 ,

- Figure 3 is a front view of the inside of the device according to one exemplary embodiment of the invention, - Figure 4 is a sectional view of the operation of the applicator according to Figure 3,

- Figure 5 is a curve showing the amplitude of movement of the applicator over time according to Figure 3,

- Figure 6 is a front view of the device according to one exemplary embodiment of the invention,

- Figure 7 is a sectional view of the operation of the applicator according to Figure 6,

- Figure 8 is a curve showing the amplitude of movement of the applicator over time according to Figure 6,

- Figure 9 is a variant of the device according to Figure 6 in front view,

- Figure 10 is a curve showing the amplitude of movement of the applicator over time according to Figure 9,

- Figure 1 1 is a sectional view of the applicator according to the invention with a damper.

The expression "rest position" is understood to mean the position in which most of the stem of the applicator is located in the device for applying a cosmetic product. The expression "end-of-travel position" is understood to mean the position in which most of the stem of the applicator is located outside the device for applying product.

Figure 1 shows a simplified device 1 for applying a cosmetic product. Such a device 1 is intended to apply a cosmetic product to a body surface of a user.

The cosmetic product is advantageously a makeup product, advantageously intended to be applied to a body surface of a user.

In a variant, the cosmetic product is a care product, in particular a face cream or body cream formula, a shampoo, a hair mask, a makeup removing oil, a treatment oil, a cleansing cream, an exfoliant, a mask or a sunscreen.

The body surface is for example the skin of a user, or keratin fibres such as hair, eyelashes or eyebrows. With reference to Figures 1 , 2, 3, 6 and 9, the device 1 is a hollow body with a polygonal cross section. In a variant, the device 1 may have a cross section which is circular, oval or any other shape.

With reference to Figures 1 , 2 and 3, the device 1 has a longitudinal axis of elongation A-A'. The device 1 comprises a base 3 and an applicator 20 opposite the base 3.

The device 1 is intended to be used in a manner parallel to the longitudinal axis A-A', that is to say parallel to the body surface of the user. The base 3 of the device 1 is the bottom 4 of the device 1 and the applicator 20 is the top 5 of the device 1 . Thus, the applicator 20 is intended to come into contact with the body surface of the user and is able to effect a back-and-forth movement along an axis X-X' perpendicular to the axis A-A'.

The device 1 is made up of a gripping holder 2 intended to be grasped manually by the user, a motor 10 housed in the gripping holder 2 and a means 30 for converting the movement of the motor 10 into a back-and-forth movement of the applicator 20.

The gripping holder 2 covers a motor body 1 1 located in the lower half of the device 1 . The motor body 1 1 comprises a motor 1 0 that is capable of producing a rotational movement about the axis A-A'.

The motor 10 can be powered by batteries, for example rechargeable batteries (not shown in the figures). In a variant, it can be powered by a suitable electric current.

The motor 10 can be turned on for example with the aid of a switch (not shown) located on the gripping holder 2 of the device 1 .

The switch may be associated with a means for the user to adjust the back-and-forth speed of the applicator.

The rotational movement of the motor 10 is transmitted to an output shaft 14 of the motor that rotates about the axis A-A'. The output shaft 14 of the motor is formed for example by a stem of axis A-A' that projects from the motor 10. The output shaft 14 of the motor is connected to the conversion means 30. As a result, the output shaft 14 of the motor can drive a cam mechanism, connecting rod mechanism and/or gear mechanism.

The conversion means 30 comprises a gear system made up of two wheels: a driving wheel 31 and a secondary wheel 32.

The driving wheel 31 comprises a cutout 33 into which the output shaft 14 of the motor will be introduced. The rotation of the output shaft 14 of the motor about the axis A-A' rotates the driving wheel 31 in the same direction of rotation about the axis A-A'.

The rotation axis of the driving wheel 31 is off-centre with respect to the driving wheel 31 .

The driving wheel 31 comprises protuberances 34 in the form of teeth.

The secondary wheel 32 also comprises protuberances 35 in the form of teeth. The protuberances 34 on the driving wheel 31 are complementary to the protuberances 35 on the secondary wheel 32. Thus, the secondary wheel 32 is driven in rotation by the driving wheel 31 in an opposite direction to the rotational movement of the driving wheel 31 about the axis A-A'.

The rotation axis of the secondary wheel 32 is off-centre with respect to the secondary wheel 32.

The driving wheel 31 and the secondary wheel 32 are elliptical in shape. In a variant, the wheels may have a non-circular shape, such as oval shapes, square shapes, heart shapes, cross shapes or any other shape.

With reference to Figure 2, a connecting rod 36 is coupled to the secondary wheel 32 by way of a pivot pin 37. The pivot pin 37 is fixed to the periphery of the secondary wheel 32, that is to say in the region of the outer part 38 of the secondary wheel 32. Figure 3 is a simplified figure, since the presence of the connecting rod 36 is not shown.

The ring 41 of the connecting rod is fixed by way of a pivot pin 39 to a stem 24, which is itself connected to the applicator 20.

A spring 40 is fixed to the stem 24 so as to ensure permanent contact between the driving wheel 31 and the secondary wheel 32. The stem 24 is included in a guideway 25 so as to convert the movement of the connecting rod 36 into a translational back-and-forth movement along the axis X-X' perpendicular to the axis A-A'.

The applicator 20 has a product applicator member 21 that projects out of the device 1 .

The applicator member 21 projects transversely at one end of the device 1 .

The applicator member 21 has a flat surface 23 designed to receive an applicator body 22 for a cosmetic product, such as a foam for example, able to come into contact with the body surface of the user.

Thus, the applicator 20 is able to move in translation along the axis X- X' in order to produce a back-and-forth movement between a rest position and an end-of-travel position.

Figure 4 presents the sequence of the movement carried out by the connecting rod 36 during the rotation of the driving wheel 31 and the secondary wheel 32. Thus, the "rest position" of the applicator is presented at the top of the diagram when the connecting rod 36 is in a horizontal position with the two driving wheels, the pivot pin 37 of the secondary wheel 32 being closest to the driving wheel 31 . The "end-of-travel position" is presented in the centre of the diagram when the connecting rod 36 is in a horizontal position with the two driving wheels, the pivot pin 37 of the secondary wheel 32 being farthest away from the driving wheel 31 .

The stem 24 sliding in its guideway 25 (not shown in this figure) is attached to the end of the connecting rod 36 at the pivot pin 39.

With reference to Figure 5, the motor 10 has a frequency of rotation which is constant over time. Given the geometry of the elliptical wheels, the translational movement of the applicator 20 varies greatly. Thus, the curve in Figure 5 shows a complex "whiplash" movement, as desired, that is to say a very rapid approach and a very rapid return of the applicator 20 with a reduced movement between each pulse. The very large movement dynamic of the applicator, an effect induced by the principle of the "whiplash" movement, can be seen. The back-and-forth movement of the applicator as it passes from its rest position to its end-of-travel position along the axis X-X' has a frequency of preferentially between 5 and 50 hertz. Preferably, the most suitable frequency for obtaining a "whiplash" effect is 16 hertz.

An average acceleration of the applicator is preferentially between 3 m/s 2 and 50 m/s 2 , preferably between 5 m/s 2 and 20 m/s 2 , preferably around 7 m/s 2 . The measurement is taken in "true RMS (root mean square)" using a laser vibrometer of the type Polytec PDV100. The Polytec PVD100 appliance takes a high resolution digital measurement of vibration speed. The Polytec PVD100 is positioned opposite the device 1 and measures the speed of the back-and-forth movement of the applicator 20 of the device 1 in the non-contact state. A root mean square is thus calculated, and an average acceleration of the applicator is obtained.

Figure 6 is a variant of the invention according to Figure 3. The device 62 comprises a motor 50.

The motor 50 has an output shaft 51 of the motor, which is connected to a conversion means 52.

The conversion means 52 consists of a driving wheel 53. The driving wheel 53 has the particular feature of having protuberances 54 on only a part of its outer surface. Thus, the driving wheel 53 has a smooth part surface 55.

A stem 56 comprises protuberances 58 in the form of teeth on its rear part 57. The protuberances 58 on the stem 56 are complementary to the protuberances 54 on the driving wheel 53.

The end of the front part 60 of the stem 56 is connected to an applicator 59. The applicator 59 is identical to the one presented in Figures 1 and 2.

The end of the rear part 57 of the stem 56 is connected to the front part 63 of a spring 61 . The rear part 64 of the spring 61 is fixed to the device 62.

The rotational movement of the motor 50 about an axis B-B' will bring about a translational back-and-forth movement of the applicator 59 along a longitudinal axis Y-Y' perpendicular to the axis B-B' between its rest position and its end-of-travel position. With reference to Figure 7, the operation of the device 62 will be described.

The starting up of the motor 50 causes the motor 50, the output shaft 51 of the motor and thus the driving wheel 53 to rotate.

In state No 1 , the rotational movement of the protuberances 54 on the driving wheel 53 that are complementary to the protuberances 58 on the stem 56 brings about the translational movement of the stem 56 towards its rest position. At the same time, the stem 56 will compress the spring 61 .

In state No 2, the spring 61 is fully compressed and the stem 56 is in its minimum rest position, that is to say almost entirely introduced into the device 62 along the axis Y-Y'.

In state No 3, the driving wheel 53 continues its rotational movement such that the smooth part surface 55 of the driving wheel 53 is opposite the stem 56. Thus, the driving wheel 53 no longer has protuberances 54 complementary to the protuberances 58 on the stem 56. No force retains the applicator 59 in its rest position. Consequently, since the spring 61 is compressed, it will relax, resulting in the translational movement of the applicator 59 towards its end-of-travel position.

In state No 4, the spring moves along the axis Y-Y in order to reach its entirely relaxed position. The releasing of the spring brings about the translational movement of the applicator 59 towards its end-of-travel position along the axis Y-Y. The driving wheel 53 continues its rotational movement, the smooth part surface 55 is still located opposite the protuberances 58 on the stem 56.

In state No 5, the spring 61 is in a fully relaxed state and the stem 56 is in its maximum end-of-travel position, that is to say located almost entirely outside the device 62 along the axis Y-Y. The protuberances 54 on the driving wheel 53 are again opposite the protuberances 58 on the stem 56. This will make it possible for the stem 56 to return to the rest position and thus to start a fresh cycle again.

With reference to Figure 8, the back-and-forth movement of the applicator 59 that is obtained by the mechanism presented above is an "abrupt" movement, as shown by the curve. The arrows indicate the passage from the rest position to the end-of-travel position of the applicator 59 which carries this out very rapidly. Thus, a movement with a rapid approach of the applicator in the region of the body surface of the user and a slower return of the applicator is obtained so as to imitate traditional hand gestures.

The back-and-forth movement of the applicator as it passes from its rest position to its end-of-travel position along the axis X-X' has a frequency of preferentially between 5 and 50 hertz. Preferably, the frequency is 16 hertz.

Figure 9 is a variant of Figure 6. The front part 63 of the spring 61 is fixed to the rear part 57 of the stem 56 such that the rear part 64 of the spring 61 is located parallel to the stem 56, that is to say at the same level as the stem 56.

The rotational movement of the driving wheel 53 brings about the translational movement of the applicator 59 towards its end-of-travel position along the axis Y-Y'. The translational movement of the applicator 59 brings about the compression of the spring 61 by the stem 56. Thus, when the smooth part surface 55 of the driving wheel 53 is located opposite the stem 56, no force retains the applicator 59 in its end-of-travel position. Consequently, since the spring 61 is compressed, it will relax, resulting in the translational movement of the applicator 59 towards its rest position.

With reference to Figure 10, the back-and-forth movement of the applicator 59 that is obtained by the mechanism presented above is an "abrupt" movement, as shown by the curve. The arrows indicate the passage from the end-of-travel position to the rest position of the applicator 59 which carries this out very rapidly. Thus, a movement with a slow approach of the applicator in the region of the body surface of the user and a more rapid return of the applicator is obtained so as to imitate traditional hand gestures.

The back-and-forth movement of the applicator as it passes from its rest position to its end-of-travel position along the axis X-X' has a frequency of preferentially between 5 and 50 hertz. Preferably, the frequency is 16 hertz.

In all of the embodiments, the amplitude of movement of the applicator is preferentially between 2 and 20 mm, preferably around 8 mm. In a variant, the number of protuberances 54 lacking on the driving wheel 53 in order to create the smooth part surface 55 can vary depending on the time required for pressing against the body surface of the user.

In a variant, it is possible for the stem not to be straight and to have a warped shape or any other shape.

With reference to Figure 1 1 , the applicator 20 can be connected to a damper 70 so as to reproduce the damping effect of the fingers. The effect obtained is a "soft" effect, that is to say the contact of the applicator with the user's skin is damped.

Thus, the damper 70 is a spring. In a variant, the damper 70 may be a foam, a liquid or a gel.

The damper 70 is included between the stem 24 and the applicator

20.

The stiffness of the damper 70 of the applicator defined by its pressure force at a given distance may be preferentially between 300 N/m and 2000 N/m, preferably around 800 N/m. The stiffness is the characteristic which indicates the resistance of a body such as the damper to elastic deformation.

If K is the stiffness, K=F/x, where

F= the force applied at a point (in Newtons)

x= the deflection of the device at a point in question (in m)

A method for applying a cosmetic product to a body surface of a user may also be described. This method consists first of all in:

- providing a device as presented in Figures 1 , 2, 3, 6 and 9,

- applying a cosmetic product directly to the user's skin or to the applicator 20 of the device 1 ,

- starting up such a device so as to position the applicator 20 next to the body surface of the user, that is to say along the axis X-X' of the applicator 20.

The values of frequency, amplitude, speed and damping are automatically incorporated into the device in order to reproduce human gestures. The values allow perfect application of makeup that is most suitable for the user. Thus, a tool which:

- is made to carry out an extremely quick movement of the "whiplash" type,

- allows a rapid back-and-forth movement,

- with a large amplitude of movement and

- damping of the applicator so as to obtain a "soft" effect, is obtained.

The invention is not limited to the examples illustrated. The features of the various examples can in particular be combined as parts of variants which are not illustrated.