TECHNICAL FIELD

[0001] The present disclosure relates generally to smart glasses, and more specifically to audio output in a smart glasses device.

BACKGROUND

[0002] With rapid advances in technology, manufacturers of mobile devices (e.g., head mounted displays, smart glasses, etc.) are continually challenged to add greater functional capability in smaller form to achieve convenience of mobility. For instance, beyond the already advanced capabilities of mobile devices, there is a need for a smart glasses device having integrated audio functions to accompany a virtual display.

[0003] Head-Mounted Displays (HMD’s) are being developed for a range of diverse uses, including military, commercial, industrial, fire-fighting, and entertainment applications. For many of these applications, there is particular value in providing audio capability.

SUMMARY

[0004] The present disclosure provides for a smart glasses device having an integrated speaker and audio ports located remote from the audio driver.

[0005] In a first exemplary embodiment, the present disclosure provides for a smart glasses device including a temple arm having a proximal end and a distal end. The smart glasses device having an optical system coupled with the temple arm proximal end, and a speaker located at least partially in the temple arm distal end. The smart glasses also having a compartment located at least partially about the speaker, wherein the compartment forms a back volume. A passageway located at least partially within the temple arm, wherein the passageway is in acoustic communication with the compartment, and one or more audio ports located in the temple arm, wherein the one or more audio ports are in acoustic communication with the passageway. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The accompanying drawings are incorporated herein as part of the specification. The drawings described herein illustrate embodiments of the presently disclosed subject matter and are illustrative of selected principles and teachings of the present disclosure. However, the drawings do not illustrate all possible implementations of the presently disclosed subject matter and are not intended to limit the scope of the present disclosure in any way.

[0007] FIG. 1 shows smart glasses device according to an embodiment of the present disclosure.

[0008] FIG. 2 shows a perspective view of a smart glasses device according to an embodiment of the present disclosure.

[0009] FIG. 3A shows a right side perspective view of a portion of the smart glasses device according to FIG. 2.

[0010] FIG. 3B shows a right side perspective cutaway view of a portion of the smart glasses device according to FIG. 2.

[0011] FIG. 4 shows a right side perspective view of a portion of the smart glasses device according to FIG. 2 and a wearer’s ear.

[0012] FIG. 5 shows a right side perspective view of a portion of the smart glasses device audio channel according to FIG. 2.

[0013] FIG. 6 shows a left side perspective view of a portion of the smart glasses device audio channel according to FIG. 2.

[0014] FIG. 7 shows a left side perspective view of the portion of the smart glasses device according to FIG. 2.

[0015] FIG. 8 shows a top cross-sectional perspective view of a portion of the smart glasses device according to FIG. 2.

[0016] FIG. 9 shows a top cross-sectional view of a portion of the smart glasses device according to FIG. 2. DETAILED DESCRIPTION

[0017] It is to be understood that the invention may assume various alternative orientations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific assemblies and systems illustrated in the attached drawings and described in the following specification are simply exemplary embodiments of the inventive concepts defined herein. Hence, specific dimensions, directions, or other physical characteristics relating to the embodiments disclosed are not to be considered as limiting, unless expressly stated otherwise. Also, although they may not be, like elements in various embodiments described herein may be commonly referred to with like reference numerals within this section of the application.

[0018] Where they are used herein, the terms “first”, “second”, and so on, do not necessarily denote any ordinal, sequential, or priority relation, but are simply used to more clearly distinguish one element or set of elements from another, unless specified otherwise.

[0019] Where they are used herein, the terms “viewer”, “operator”, "observer", and “user” are considered to be equivalent and refer to the person or machine that wears and/or views images using an electronic device.

[0020] Where used herein, the term “set” refers to a non-empty set, as the concept of a collection of elements or members of a set is widely understood in elementary mathematics. Where used herein, the term “subset”, unless otherwise explicitly stated, refers to a nonempty proper subset, that is, to a subset of the larger set, having one or more members. For a set S, a subset may comprise the complete set S. A “proper subset” of set S, however, is strictly contained in set S and excludes at least one member of set S.

[0021] Head-Mounted Displays (HMD’s) are developed for a range of diverse uses, including military, commercial, industrial, fire-fighting, and entertainment applications. An HMD is operable to form a virtual color image that can be visually superimposed over the real-world image that lies in the field of view of the HMD user. Optically transparent flat parallel plate waveguides, also called planar waveguides, convey image-bearing light generated by a polychromatic, or monochromatic, projector system to the HMD user. The planar waveguides convey the image-bearing light in a narrow space to direct the image to the HMD user's pupil and enable the superposition of the virtual image over the real-world image that lies in the field of view of the HMD user. [0022] In imaging light guides, collimated, relatively angularly encoded light beams from a color image projector source are coupled into an optically transparent planar waveguide assembly by an input coupling optic, such as an in-coupling diffractive optic, which can be mounted or formed on a surface of the parallel plate planar waveguide or disposed within the waveguide. Such diffractive optics can be formed as, but are not limited to, diffraction gratings or holographic optical elements. For example, the diffraction grating can be formed as a surface relief grating. After propagating along the planar waveguide, the diffracted color image-bearing light can be directed back out of the planar waveguide by a similar output grating, which may be arranged to provide pupil expansion along one or more directions. In addition, one or more intermediate diffractive optics (e.g., turning gratings) may be positioned along the waveguide optically between the input and output gratings to provide pupil expansion in one or more directions. The image-bearing light output from the parallel plate planar waveguide provides a virtual image within an expanded eyebox for the viewer.

[0023] In contrast to methods for forming a real image, a virtual image is not formed on a display surface. That is, if a display surface were positioned at the perceived location of a virtual image, no image would be formed on that surface. Virtual image display has a number of inherent advantages for augmented reality presentation. For example, the apparent size of a virtual image is not limited by the size or location of a display surface. Additionally, the source object for a virtual image may be small; for example, a magnifying glass provides a virtual image of an object. In comparison with systems that project a real image, a more realistic viewing experience can be provided by forming a virtual image that appears to be some distance away. Providing a virtual image also obviates the need to compensate for screen artifacts, as may be necessary when projecting a real image. The augmented reality (AR) smart glasses device(s) described herein provide integrated audio functionality to accompany the virtual image functionality thereof.

[0024] As illustrated in FIG. 1, in an embodiment, a display system operable for augmented reality viewing comprises smart glasses 10. The smart glasses 10 include at least a right temple arm 12 and a processing unit 14 having memory operable to store data and computer programs. The processing unit 14 is also operable to execute the computer programs. The smart glasses 10 may include a right eye optical system 20 having an image light guide 22. The smart glasses 10 include an image source 24 such as, but not limited to, a picoprojector, microLED projector, or similar device, energizable to generate an image. The virtual image that is formed by the smart glasses 10 can appear to be superimposed or overlaid onto the real-world scene content as seen by the viewer through the image light guide 22. Additional components familiar to those skilled in the augmented reality visualization arts, such as one or more cameras mounted on the frame of the HMD for viewing scene content and/or viewer gaze tracking, can also be provided.

[0025] As illustrated in FIGS. 1-3, in an embodiment, the right temple arm 12 includes a proximal end 12A located adjacent to the right eye optical system 20, and a distal end 12B located opposite the proximal end 12A. A power source 16, such as a battery, and the speaker 18 are located in the temple arm distal end 12B. The processing unit 14 is in electrical communication with the power source 16 and the speaker 18. For example, the speaker 18 may be an electroacoustic transducer having an audio driver.

[0026] Referring now to FIGS. 3-4, in an embodiment, the speaker 18 is located between the power source 16 and the temple arm proximal end 12A. A compartment 30 is located between, and is at least partially defined by, the power source 16 and the speaker 18. In another embodiment, the compartment 30 may be defined by the material of the temple arm 12 and the speaker 18, but not by the power source 16. The compartment 30 is in fluid (e.g., air) communication with an audio channel 32.

[0027] The audio channel 32 is located through at least a portion of the temple arm 12. One or more audio ports 34 are located in the temple arm 12 and are in acoustic communication with the speaker 18 via the audio channel 32. Acoustic waves are operable to propagate through the air in the audio channel 32. In an embodiment, the audio ports 34 are located generally forward of the wearer’s auricle 50 (the outer ear) and above the wearer’s ear canal 52, while the speaker 18 is located generally behind, or rearward of, the wearer’s auricle 50. In an embodiment, the audio channel 32 includes a generally rectangular passageway 36 in acoustic communication with the speaker 18. The compartment 30 forms a sealed back volume. In other embodiments, the passageway 36 may comprise cross-sectional geometries such as, but not limited to, circular, elliptical, and triangular. The passageway 36 is also in acoustic communication with the audio ports 34. The one or more audio ports 34 are located generally in the bottom of the temple arm 12. In an embodiment, to reduce destructive interference of the sound waves propagated through the audio channel 32 to the audio ports 34, the passageway 36 includes an angled surface 38 oriented to deflect the sound waves toward the audio ports 34. The angled surface 38 deflects sound waves propagating in a generally horizontal direction in a generally vertical direction toward the one or more audio ports 34. Sound waves 54 exit the one or more audio ports 34 and are incident upon the wearer’s ear canal 52. In an embodiment, the speaker 18 is positioned such that the audio driver is operable to oscillate in a direction generally perpendicular to the passageway 36.

[0028] By locating the speaker 18 in the distal end 12B of the of temple arm 12 remote from the wearer’s ear canal, the compartment 30 can have a size operable to form a back volume around the speaker 18, without creating discomfort for the wearer due to the size of the temple arm 12. The audio channel 32 is operable to transmit sound waves from the speaker 18 along at least a portion of the length of the temple arm 12 to the audio ports 34. In other words, the audio channel 32 enables the audio ports 34 to be located at any position along the temple arm 12, independent of the speaker 18 location.

[0029] In an embodiment, the interface between a front volume and the passageway 36 defines an aperture 40. The aperture 40 has a first width wi and the passageway 36 has a second width W2, wherein the second width W2 is greater than the first width wi. In an embodiment, the passageway 36 gradually increases in width from the smallest width of the aperture 40. In an embodiment, the compartment 30 gradually increases in width from the smallest width of the aperture 40.

[0030] Referring now to FIGS. 5, 6 and 8, in an embodiment, the temple arm 12 includes an acoustic guide 60. The acoustic guide 60 defines at least a portion of the audio channel passageway 36. In an embodiment, the acoustic guide includes a channel arm 35 connected with a speaker plate 62. In one embodiment, the acoustic guide channel arm 35 forms three surfaces of the rectangular passageway 36 and the outward facing portion of the temple arm 12 forms the fourth surface of the rectangular passageway 36. The acoustic guide speaker plate 62 is located in the compartment 30 and abutting, or coupled with, the speaker 18. The speaker plate 62 and an inward facing portion of the temple arm 12 at least partly define the front volume. The speaker plate 62 includes an aperture 64 through which the driver of the speaker 18 is in acoustic communication with the front volume. The acoustic guide 60 defines an aperture 41 between the speaker plate 62 and the channel arm 35. The aperture 41 provides fluid communication between the front volume and the aperture 40 and/or the passageway 36. As shown in FIG. 9, in an embodiment, acoustic waves AW1 generated by the speaker 18 propagate through the front volume, and through the apertures 41, 40 into the passageway 36. [0031] In an embodiment, an acoustic material operable to filter acoustic waves of a predetermined pressure is located at, or adjacent to, the aperture 40. In an embodiment, an acoustically transparent material through which acoustic waves travel without substantial effect is located at, or adjacent to, the one or more audio ports 34 to prevent dust, dirt, liquids and similar debris from entering the passageway 36.

[0032] In an embodiment, as illustrated in FIG. 2, the smart glasses 10 may also include a left temple arm 13 having a proximal end 13A and a distal end 13B, the temple arm 13 including a second speaker 18 and audio channel 32 as described with regard to the right temple arm 12. Having a speaker 18 and audio channel 32 in each temple arm 12, 13 enables stereophonic sound.

[0033] One or more features of the embodiments described herein may be combined to create additional embodiments which are not depicted. While various embodiments have been described in detail above, it should be understood that they have been presented by way of example, and not limitation. It will be apparent to persons skilled in the relevant arts that the disclosed subject matter may be embodied in other specific forms, variations, and modifications without departing from the scope, spirit, or essential characteristics thereof. The embodiments described above are therefore to be considered in all respects as illustrative, and not restrictive. The scope of the invention is indicated by the appended claims, and all changes that come within the meaning and range of equivalents thereof are intended to be embraced therein.