EP4673784A1 - Système optique pour applications de réalité augmentée - Google Patents

Système optique pour applications de réalité augmentée

Info

Publication number
EP4673784A1
EP4673784A1 EP24709003.8A EP24709003A EP4673784A1 EP 4673784 A1 EP4673784 A1 EP 4673784A1 EP 24709003 A EP24709003 A EP 24709003A EP 4673784 A1 EP4673784 A1 EP 4673784A1
Authority
EP
European Patent Office
Prior art keywords
contact
prism facets
fresnel lens
optical waveguide
optical system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP24709003.8A
Other languages
German (de)
English (en)
Inventor
Richard Quintanilha
René HENSEL
Philipp Scheiderer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tooz Technologies GmbH
Original Assignee
Tooz Technologies GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tooz Technologies GmbH filed Critical Tooz Technologies GmbH
Publication of EP4673784A1 publication Critical patent/EP4673784A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens

Definitions

  • aspects of the disclosure pertain to optical systems for augmented reality applications that include an optical waveguide configured to form images as well as a Fresnel lens arranged along the optical waveguide.
  • Various aspects specifically relate to design aspects of the Fresnel lens and techniques of attaching the Fresnel lens to the optical waveguide.
  • Augmented reality applications create images in a line of sight of a user observing the environment.
  • the user has a field of view that includes, both, digitally created information depicted by the image as well as real-world surroundings, i.e. , environmental objects.
  • FIG. 1 illustrates an example optical system 100 for augmented reality applications.
  • the optical system 100 can be integrated in a spectacle lens or a head- up display.
  • the optical system 100 includes a see-through optical waveguide 122.
  • the see-through optical waveguide is configured to form images in a display region 125 thereof. For instance, holographic images can be formed.
  • a lens 111 is arranged on an eye-side 182 of the optical system 100 adjacent to the optical waveguide 122.
  • the lens 111 forms light exiting the optical waveguide 122.
  • the optical system 100 also includes a further lens 112 located at the real-world side 181 adjacent to the optical waveguide 122.
  • the lenses 111 , 112 form a conjugate pair of lenses and are sometimes referred to as push-pull lenses or push-pull system of lenses.
  • To implement the optical system 100 having compact dimensions along a thickness direction 191 it has been proposed to use Fresnel lenses for the lens 111 and/or the lens 112. See WO 2022/245447 A1 .
  • Fresnel lenses See WO 2022/245447 A1 .
  • the structural robustness of the optical system 100 can suffer from using Fresnel lenses.
  • optical properties of the optical system 100 can suffer from using Fresnel lenses.
  • An optical system for augmented reality applications is disclosed.
  • the optical system includes a Fresnel lens. It some examples, the optical system includes multiple Fresnel lenses, e.g., a negative and a positive Fresnel lens in a conjugated arrangement. More generally, the optical system includes a conjugate pair of Fresnel lenses. Two Fresnel lenses can sandwich an optical waveguide.
  • the one or more Fresnel lenses may have a circular design.
  • Prism facets can form circles or ellipses around a center of the respective Fresnel lens.
  • Each one of one or more Fresnel lens can have a flat circular design. One side of each one of the one or more Fresnel lens can be flat. The total thickness of each one of the one or more Fresnel lens can be smaller than its clear aperture.
  • the prism facets typically include a slope part and a draft part.
  • the prism facets can have a curved surface, to resemble an aspheric lens.
  • the outer prism facets can be linearized.
  • the one or more Fresnel lenses each include prism facets. These can be circular prism facets. A constant heigh design can be employed; all relevant prism facets have the same heigh. Alternatively, a constant width design is used; here the prism facets all have the same width.
  • some prism facets have a larger height than other prism facets. This enables to bring the respective Fresnel lens into contact with other optical objects, specifically an optical waveguide, only at some sections thereof, formed by those prism facets having the larger height.
  • FIG. 1 schematically illustrates an optical system for augmented reality applications including an optical waveguide sandwiched by a push-pull lens system according to various examples.
  • FIG. 2 schematically illustrates a reference implementation of a Fresnel lens arranged adjacent to and along an optical waveguide according to various examples.
  • FIG. 3 schematically illustrates a reference implementation of a Fresnel lens arranged adjacent to and along an optical waveguide according to various examples.
  • FIG. 4 schematically illustrates an example implementation of a relative arrangement of a Fresnel lens arranged adjacent to and along an optical waveguide according to various examples.
  • FIG. 5 schematically illustrates an example implementation of a relative arrangement of a Fresnel lens arranged adjacent to and along an optical waveguide according to various examples.
  • FIG. 6 is a top view of an example Fresnel lens.
  • FIG. 7 is a top view of an example Fresnel lens.
  • FIG. 8 is a top view of an example Fresnel lens.
  • FIG. 9 is a top view of an example Fresnel lens.
  • FIG. 10 schematically illustrates an example implementation of a relative arrangement of a Fresnel lens arranged adjacent to and along an optical waveguide according to various examples.
  • Images are created in the field of view of a user using see-through optics so that the user, both, perceives the digitally-created image as well as the environment.
  • the images can, depending on the particular use case, provide additional information to the user, e.g., text messages, information regarding objects in the environment that are visible to the user, etc.
  • Other use cases include depicting objects that seamlessly integrate into the environment, e.g., for games or route guidance for navigation use cases.
  • the particular type of augmented reality application is not germane to the techniques disclosed herein.
  • Optical systems include a see-through optical waveguide that is configured to form images in a display region of the optical waveguide.
  • the optical waveguide can form holographic images.
  • the optical waveguide includes a substrate region and a holographic optical element arranged adjacent to the substrate region.
  • the holographic optical element includes a periodic modulation of the refractive index. This enables to couple out light from the optical waveguide, to thereby form the image in the display region.
  • An image forming unit is configured to create the light and provide the light towards an entry region of the optical waveguide.
  • the image forming unit implements a display.
  • Internal reflections can guide the light within the optical waveguide from the entry region to the display region where the holographic optical element is arranged. Then, light can be coupled out from the waveguide by means of the holographic optical element at the display region.
  • the optical waveguide is see through, the user can perceive objects in the environment through the optical waveguide.
  • An example optical system 100 that can be employed in the various techniques disclosed herein as illustrated in FIG. 1 and has already been described above. Illustrated is the image forming unit 121 that generates the light that couples into the optical waveguide 122 in the input region. Then the light is guided from the input region to the display region 125 using multiple internal reflections between a real- world surface 132 and an eye-side surface 131 of the optical waveguide 122. This is achieved by total internal reflection due to the refractive index used by the optical waveguide 122.
  • the optical waveguide is made, e.g., from glass or silica material.
  • the Fresnel lenses 111 , 112 e.g., flat, circular lenses - are offset along a thickness direction 191 (or z-direction).
  • the optical waveguide 122 is sandwiched in-between the Fresnel lenses 111 , 112.
  • the optical waveguide 122 and the Fresnel lenses 111 , 112 extend laterally, i.e., along lateral directions 192 (x and y directions).
  • the Fresnel lens 111 is arranged along the optical waveguide 122 towards the eyeside 182 of the optical system 100. Images created by the optical waveguide 122 in the display region 125 are depicted/imaged by the Fresnel lens 111.
  • the Fresnel lens 111 shapes light exiting the optical waveguide 122.
  • the optical effect of the Fresnel lens 111 - here implemented as a negative lens - also acts upon light rays entering the optical system 100 from its surrounding at the real-world side 181.
  • the Fresnel lens 112 that compensates the optical effect of the Fresnel lens 111.
  • the Fresnel lens 112 is arranged along the optical waveguide 122 towards the real-world side 181 of the optical system 100.
  • the clear aperture 116 of the Fresnel lens 112 corresponds to the clear aperture 115 of the Fresnel lens 111 , but may differ in other scenarios.
  • the clear apertures 115, 116 can be as large as the field of view of the user.
  • the Fresnel lens 111 is a negative lens that creates diverging rays from light rays that exit the optical waveguide 122 to form the image in the display region.
  • a focal position of the negative lens 111 is arranged at a real-world side 181 of the optical system 100 (opposite to the eye side 182).
  • the optical effect of the negative lens 111 also acts upon light rays entering the optical system 100 from its surrounding at the real-world side 181 .
  • divergent rays of light are created from the image formed by the optical waveguide 122; this creates the perception of objects depicted in the image being located further away from the eye of the user in the environment of the optical system 100 than the actual distance between the eye and the optical waveguide 122. Objects are apparently “pushed” away from the observer. This is why the Fresnel lens 111 is referred to as “push lens”.
  • This optical functionality of the Fresnel lens 111 can be superimposed with corrective functionality to compensate for myopia or hyperopia of the observer.
  • the Fresnel lens may natively (without correcting for myopia or hyperopia) have a dioptrie of -0.53 to project the augmented-reality image at 2 m at the real- world side.
  • the push lens is +0.58 dioptrie to compensate that. If eye correction is +18, then this value is added to the dioptrie referred above.
  • Such addition can be achieved by appropriately shaping the Fresnel lens geometry; or using classic convex or concave lens geometries as a baseline for the Fresnel geometry.
  • astigmatism correction may be provided by the Fresnel lens 111.
  • the clear aperture 115 of the Fresnel lens 111 is larger than the display region 125.
  • the Fresnel lens 111 and the Fresnel lens 112 can be made of polymer or plastics.
  • Fresnel lenses offer the possibility of thin designs, i.e., small dimensions between an outer surface of the optical system 100 at the real-world side 181 and an outer surface of the optical system 100 at the eye side 182. This enables flexible system integration, e.g., into spectacle lenses. Volume and weight are reduced.
  • a thickness 861 , 862 of the Fresnel lenses 111 , 112 is smaller than a thickness 869 of the optical waveguide, 122.
  • Various disclosed techniques are based on the finding that the use of Fresnel lenses in an optical system for augmented reality applications according to reference implementations can cause optical imperfections due to stray light generated at discontinuities of the side profile of the Fresnel lens. Furthermore, it has been found that the use of Fresnel lenses can degrade the performance of the optical waveguide 122, e.g., reduce the internal reflection used for guiding the light towards the display region 125. Techniques are disclosed to mitigate such drawbacks.
  • the critical angle 0 c for total internal reflection associated with the optical waveguide 122 should be small.
  • the critical angle is given by: where t is the refractive index of the surrounding of the optical waveguide and n 2 is the refractive index of the material of the optical waveguide.
  • a design goal is: n x « n 2
  • the optical waveguide 122 is directly glued to the Fresnel lens 111 , at the surface 131.
  • the Fresnel lens 111 employs a so-called constant-height design.
  • the prism facets of the Fresnel lens 111 all have the same height (constant height design).
  • the refractive index in the surrounding of the optical waveguide 122 is that of the glue.
  • FIG. 3 To mitigate such drawbacks of the design of the optical system 100 in the scenario of FIG. 2, a further reference design as illustrated in FIG. 3 can be used.
  • the reference design of the optical system 100 as illustrated in FIG. 3 also employs a constantheight Fresnel lens 111 (as in FIG. 2).
  • none of the prism facets of the Fresnel lens 111 is in contact with the optical waveguide 122 or specifically the surface 131. This is because the Fresnel lens 111 is spaced apart by a gap 211 from the optical waveguide 122.
  • This gap 211 is filled with glue.
  • the gap 211 avoids light leakage due to direct contact between the prism facets of the Fresnel lens 111 with the optical waveguide 122 as in the scenario of FIG. 2.
  • the light-guiding performance of the optical waveguide 122 is degraded due to the surrounding of the optical waveguide 122 having the comparatively large refractive index of glue.
  • the Fresnel lens includes contact prism facets that are in contact with the eye-side surface 131 of the optical waveguide 122, but also includes non-contact prism facets that are not in contact with the eye-side surface 131 of the optical waveguide 122.
  • the non-contact prism facets are spaced apart from the optical waveguide 122.
  • the contact prism facets can have a constant height; they can be in contact with the eye side surface 131 along their entire length.
  • the contact prism facets alternatively have varying height along their length; and are, accordingly, in contact with the eye-side surface 131 only at certain sites or sections.
  • FIG. 4 illustrates an example design of the optical system 100, specifically of the Fresnel lens 111.
  • FIG. 4 schematically illustrates a profile of an example implementation of the Fresnel lens 111.
  • the Fresnel lens can be a flat circular Fresnel lens. This means that the prism facets can form circles or ellipses at a certain radius with respect to the center 595 of the Fresnel lens 111 (not shown in the side view of FIG. 1 ).
  • the Fresnel lens 111 in the scenario FIG. 4 includes contact prism facets 511 and non-contact prism facets 512. As illustrated in the scenario FIG. 4, the count of the contact prism facets 511 is significantly smaller than the count of the non-contact prism facets.
  • the ratio of the count of the contact prism facets to the count of the non-contact prism facets is not larger than 1 :4.
  • the Fresnel lens 111 can be attached to the optical waveguide 122 in a reliable manner. Specifically, an offset as in the scenario of FIG. 3 is not required across the entire clear aperture 115 of the Fresnel lens 111. Thereby, the relative arrangement of the Fresnel lens 111 to the optical waveguide 122 is well-designed and stable. Drifts due to expanding or contracting adhesive are avoided. Furthermore, light leakage due to an excessive number of prism facets of the Fresnel lens being in contact with the optical waveguide 122 can be avoided. The number of contact points can be minimized.
  • FIG. 4 includes an inset (dashed circle) that illustrates details with respect to one example implementation of the contact between the contact prism facets 511 and the eye-side surface 131 of the optical waveguide 122 (but the scenario of FIG. 4 is not tied to such implementation).
  • the contact prism facets 511 include a flat contact surface 555 (e.g., chopped/cut) that is arranged in-between and tilted with respect to both a draft part 505 and a slope part 506 of the contact prism facets 511.
  • the flat contact surface 555 engages the eye-side surface 131 , thereby creating a stable and robust contact.
  • the facet height 551 for a number of prism facets 511 , 512 Illustrated in FIG. 4 is the facet height 551 for a number of prism facets 511 , 512.
  • the facet height 551 of the non-contact prism facets 512 increases from the center 595 of the Fresnel lens 111 towards the edge of the Fresnel lens 111 , more specifically towards the edge of the clear aperture 115 of the Fresnel lens 111. This is in contrast to the constant-height reference designs of FIG.
  • the facet width 552 for a number of prism facets 511 , 512 is also illustrated in FIG. 4.
  • the non-contact prism facets 512 rather have a constant width 552.
  • a constant-width design is used.
  • the contact prism facets 511 have the same width 552 as the non-contact prism facets 512.
  • FIG. 4 a scenario is illustrated in which the two outmost prism facets are contact prism facets 511 in contact with the optical waveguide 122.
  • the two outmost prism facets are contact prism facets 511 in contact with the optical waveguide 122.
  • the contact prism facets 511 are all arranged at the edge of the clear aperture 115 of the Fresnel lens 111.
  • at least one of the contact prism facets may be arranged at the edge of the clear aperture 115.
  • Such arrangement creates a cavity 605 in-between the eye-side surface 131 of the optical waveguide 122 and the Fresnel lens 111 .
  • a low-index material can be arranged in the cavity 605.
  • the low-index material can be selected from the group including air, nitrogen, aerogel, liquid crystal, etc.
  • the aerogel can provide mechanical support.
  • the low-index material can have a refractive index that is smaller than 1 .35.
  • the low-index material can have a refractive index in the range of 1 -1 .2.
  • low-index glues or optical cements available that can be used to fill the cavity 605. Thereby, the critical angle for total reflection in the waveguide is small. The light-guiding properties are good.
  • the contact prism facets 511 surround the non-contact prism facets 512.
  • the contact prism facets 511 are arranged interleaved with the non-contact prism facets 512 in a radial direction (XY direction 192). Such scenarios illustrated in FIG. 5.
  • FIG. 5 schematically illustrates a profile of an example implementation of the Fresnel lens 111. While FIG. 5 illustrates a constant-height design of the non-contact prism facets 512, also a constant-width design of the non-contact prism facets 512 (e.g., as illustrated in FIG. 4) would be possible.
  • the contact prism facets 511 and the non-contact prism facets 512 are arranged interleaved with each other, along the lateral directions 192. Thereby, the stability of the optical waveguide and generally the optical system 100 can be increased. Bending of the optical waveguide 122 is prevented, due to the multiple contact positions provided by the interleaved contact prism facets 511. Also, bending of the Fresnel lens is prevented.
  • the Fresnel lens can be made from polymer or plastic material at greater flexibility than the optical waveguide, e.g., made of silica or other glass material having a high optical index.
  • FIG. 6 is a top view of the Fresnel lens 111.
  • the design of the Fresnel lens 111 illustrated in FIG. 6 corresponds to the design illustrated in FIG. 4.
  • the outmost two prism facets implement contact prism facets 511 ; while the inner prism facets are non-contact prism facets 512 (in FIG. 6 the contact prism facets, and more specifically sites at which the contact prism facets 511 are in contact with the side surface 131 of the optical waveguide 122, e.g., the contact regions 555 as discussed in the inset of FIG. 4 are illustrated with thick lines).
  • the contact prism facets 511 implement contact prism facets 511 ; while the inner prism facets are non-contact prism facets 512 (in FIG. 6 the contact prism facets, and more specifically sites at which the contact prism facets 511 are in contact with the side surface 131 of the optical waveguide 122, e.g., the contact regions 555 as discussed in the inset of FIG
  • the height 551 of the contact prism facets 511 does not vary as a function of the perimeter position, i.e. , does not vary in the circumferential direction of the contact prism facets 511 .
  • the contact regions 555 cover the entire 360° around the center 595. This is also the case for the scenario of the design/arrangement of the contact prism facets 511 and the non-contact prism in FIG. 7 (also a top view of the Fresnel lens 111 ).
  • the contact prism facets 511 and the non-contact prism facets 512 are arranged in an interleaved manner along the lateral directions 192 (cf. FIG. 5).
  • the height of some of the contact prism facets varies along its length, i.e., along the circumferential direction as a function of the perimeter position.
  • the respective contact prism facets 511 include, both, contact regions 555 (bold lines) and non-contact regions 556 (narrow lines). Only the contact regions 555 are in contact with the eye-side surface 131 . Such interleaved arrangement of the contact regions 555 and the non-contact regions 556 further reduces the total area where the optical waveguide 122 is in contact with the Fresnel lens 111. Thereby, light leakage can be further reduced.
  • the positions of the contact regions 555 can form a defined pattern or can be randomly placed.
  • FIG. 10 schematically illustrates a profile of an example implementation of the Fresnel lens 111.
  • the clear aperture 115 of the Fresnel lens 111 includes only non-contact prism facets 512.
  • a contact element 711 is provided outside of the clear aperture 115 of the Fresnel lens 111. The contact element 711 supports contact between the Fresnel lens 111 and the optical waveguide 122.
  • the contact element 711 may also be combined with any other design of the Fresnel lens, e.g., as discussed above.
  • the contact element 711 extends at the perimeter of the flat, circular Fresnel lens 111.
  • the contact element 711 and the Fresnel lens 111 are integrally formed. For instance, they could be formed from a single extrusion process or could be 3-D printed in a single printing process.
  • the contact element 711 forms a circumferential edge of the cavity 605 filled with the low-index material. In that sense, the scenario of FIG. 10 is different than the scenario of FIG. 3. While the scenarios of FIG. 10 and FIG.
  • the optical waveguide 122 in the display region is not in contact with the adhesive, but rather with the low-index material in the cavity 605.
  • this is enabled by the contact element 711 that includes a region 724 that can be configured to seal the cavity 605 with respect to the environment.
  • the region 724 engages and extends away from the eye-side surface 131 of the optical waveguide 122.
  • the region 724 separates a notch 723 from the Fresnel lens 111 and the cavity 605.
  • the notch (generally the contact element 711 ) extends around the full circumferential perimeter of the Fresnel lens 111.
  • the notch 723 is filled with adhesive that fixes the Fresnel lens 111 and the contact element 711 to the optical waveguide 122.
  • the exit channel 721 connects the notch 723 with the surrounding/environment of the optical system 100. Thereby, excess adhesive in the notch can be discharged.
  • the channel 721 can also extend along the entire circumferential perimeter of the Fresnel lens 111. Alternatively, it would be possible that multiple distinct channels are formed at different circumferential positions.
  • FIG. 10 illustrates a scenario in which the contact element 711 is combined with a constant-height Fresnel lens 111 , as a general rule, the contact element 711 could also be employed with other designs of the Fresnel lens such as those designs illustrated in connection with FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8 or FIG. 9.
  • a cavity can be provided between the optical waveguide and a Fresnel lens, the cavity including the low-index material such as air, aerogel, etc.
  • Techniques have been disclosed that facilitate a simplified assembly process, e.g., by providing notches of the Fresnel lenses that are filled with adhesive.
  • Fresnel lens designs have been disclosed such as constant height or constant width or a mixture thereof.
  • Techniques have been disclosed to use contact and non-contact prism facets. This enables to optimize the width of the prism facets and/or the height of the prism facets. Also, an angle of the sidewalls of the prism facets can be optimized.
  • the 2-D or 3-D profile of the Fresnel lens can be optimized. This enables to improve the performance of the Fresnel lens.
  • the optical quality of imaging can be increased. Certain mechanical properties can be enforced.
  • a compact push-pull system of Fresnel lenses can be used.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

Divers exemples de l'invention concernent un système optique pour des applications de réalité augmentée, par exemple, des lunettes ou un affichage tête haute. Une lentille de Fresnel (111, 112) est utilisée en combinaison avec un guide d'ondes optique (122). L'invention concerne également diverses conceptions de la lentille de Fresnel.
EP24709003.8A 2023-03-01 2024-02-29 Système optique pour applications de réalité augmentée Pending EP4673784A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102023105030.3A DE102023105030A1 (de) 2023-03-01 2023-03-01 Optisches system für anwendungen mit erweiterter realität
PCT/EP2024/055293 WO2024180194A1 (fr) 2023-03-01 2024-02-29 Système optique pour applications de réalité augmentée

Publications (1)

Publication Number Publication Date
EP4673784A1 true EP4673784A1 (fr) 2026-01-07

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EP24709003.8A Pending EP4673784A1 (fr) 2023-03-01 2024-02-29 Système optique pour applications de réalité augmentée

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EP (1) EP4673784A1 (fr)
CN (1) CN120712509A (fr)
DE (1) DE102023105030A1 (fr)
WO (1) WO2024180194A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102024104823A1 (de) * 2024-02-21 2025-08-21 tooz technologies GmbH Brillenglas für eine auf den Kopf eines Benutzers aufsetzbare und ein Bild erzeugende Anzeigevorrichtung sowie Anzeigevorrichtung mit einem solchen Brillenglas

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4741887B2 (ja) * 2005-06-24 2011-08-10 Ｎｅｃ液晶テクノロジー株式会社 光源装置、表示装置及び端末装置
DE102015114990B4 (de) * 2015-09-07 2022-05-12 tooz technologies GmbH Linsenanordnung, insbesondere Brillenglasanordnung, Anzeigevorrichtung und Verfahren zum Herstellen einer Linsenanordnung
WO2017057386A1 (fr) * 2015-09-29 2017-04-06 シャープ株式会社 Visiocasque
WO2020045517A1 (fr) * 2018-08-28 2020-03-05 株式会社ソニー・インタラクティブエンタテインメント Ensemble lentille et dispositif d'observation d'image
US11454747B1 (en) * 2019-02-11 2022-09-27 Meta Platforms Technologies, Llc Shadow-matched Fresnel lens doublet for reduced optical artifacts
US11397465B1 (en) 2021-05-17 2022-07-26 Microsoft Technology Licensing, Llc Glint-based eye tracker illumination using dual-sided and dual-layered architectures

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Publication number Publication date
CN120712509A (zh) 2025-09-26
WO2024180194A1 (fr) 2024-09-06
DE102023105030A1 (de) 2024-09-05

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