# US 11,906,744 B2 · Display lens manufacturing apparatus and method, and head-mounted display device comprising display lens manufactured thereby > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,744 B2 - Document ID: US11906744B2 - Status: Granted - Kind: B2 - Application number: 17/607,663 - Filed: 2020-09-23 - Published: 2022-07-07 - Granted: 2024-02-20 - Earliest claimed: 2019-09-27 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Jae Jin Kim; Byung Mook Kim; Dae Han Seo; Min Soo Song; Bu Gon Shin - Web page: https://patentgrep.com/patent/US11906744B2 ## CPC - G02B 27/0172: {characterised by optical features} - G03H 1/0465: {Particular recording light; Beam shape or geometry (G03H1/06 takes precedence)} - G02B 3/0012: {characterised by the manufacturing method} - G02B 5/32: Holograms used as optical elements - G02B 27/0103: {comprising holographic elements} - G03H 1/0005: {Adaptation of holography to specific applications (holographic optical element G02B5/32; holographic scanner G02B26/106; recognition using holographic mask G06V10/88; holographic memories G11B7/0065, G11C13/042)} - G03H 1/04: Processes or apparatus for producing holograms (G03H1/26 takes precedence) - G03H 1/041: {Optical element in the object space affecting the object beam, not otherwise provided for} - G02B 2027/0109: {comprising details concerning the making of holograms} - G02B 2027/0174: {holographic} - G03H 2001/0415: {for recording reflection holograms} - G03H 2001/0439: {for recording Holographic Optical Element [HOE]} - G03H 2223/12: Amplitude mask, e.g. diaphragm, Louver filter - G03H 2223/19: Microoptic array, e.g. lens array - G03H 2260/30: Details of photosensitive recording material not otherwise provided for - G03H 2270/55: being an optical element, e.g. spectacles - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G03H: HOLOGRAPHIC PROCESSES OR APPARATUS (holograms, e.g. point holograms, used as ordinary optical elements G02B5/32; producing stereoscopic or other three-dimensional effects G02B30/00; diffraction-grating systems G02B27/44; systems using moiré fringes G02B27/60; optical logic elements G02F3/00; stereo-photography G03B35/00; photosensitive materials or processes for photographic purposes G03C; {stereo-photographic or similar processes G03C9/00}; apparatus for processing exposed photographic materials G03D; analogue computers performing mathematical operations with the aid of optical elements G06E3/00; authentication by radiation, of concealed information carried by holograms or diffraction gratings G06K19/16; holographic storage G11B7/0065, G11C13/04; {stereoscopic or other three dimensional effects in television systems H04N13/00}) ## Abstract An embodiment according to an aspect of the present disclosure provides a device for manufacturing a display lens, a method for manufacturing a display lens using the device, and a head-mounted display device including the display lens manufactured thereby. The device for manufacturing a display lens including a holographic optical element formed by recording a hologram on a photosensitive substrate, in which a substrate is coated with a photosensitive material, through irradiation of laser beams includes: a first laser light incidence unit configured to cause first laser light, converging along an irradiation direction, to be incident on one surface of the photosensitive substrate; and a second laser light incidence unit configured to cause second laser light, diverging at a plurality of points along an irradiation direction, to be incident on the other surface of the photosensitive substrate. ## Claims ### Claim 1 A device for manufacturing a display lens including a holographic optical element formed by recording a hologram on a photosensitive substrate, in which a substrate is coated with a photosensitive material, through irradiation of laser beams, the device comprising: a first laser light incidence unit configured to cause a first laser light, converging along a first irradiation direction, to be incident on a first surface of the photosensitive substrate; and a second laser light incidence unit configured to cause a second laser light, diverging at a plurality of points along a second irradiation direction, to be incident on a second surface of the photosensitive substrate, the second surface being opposite from the first surface, wherein the second laser light incidence unit includes a lens array having a top surface on which a plurality of lens portions configured to convert parallel light into diverging light are arranged, the device being configured such that the parallel light incident on the lens array is radiated as the second laser light, which is diverging light, toward the second surface of the photosensitive substrate at the plurality of points through the respective lens portions. ### Claim 2 (depends on 1) The device according to claim 1, wherein a non-light-transmissive mask is disposed outside of a region underlying each lens portion on a bottom surface of the lens array that is opposite to the top surface. ### Claim 3 (depends on 1) The device according to claim 1, wherein a distance between centers of adjacent ones of the plurality of lens portions is 4 to 6 mm. ### Claim 4 (depends on 1) The device according to claim 1, wherein a focal length of each of the plurality of lens portions is 2 to 10 mm. ### Claim 5 (depends on 4) The device according to claim 4, wherein a radius of curvature of each of the plurality of lens portions satisfies the following Equation: 1/F=(n−1)*(1/R) where F represents the focal length of the lens portion, n represents a refractive index of the lens array, and R represents the radius of curvature of the lens portion. ### Claim 6 (depends on 1) The device according to claim 1, wherein a diameter of each of the plurality of lens portions is 1 to 3 mm. ### Claim 7 A method for manufacturing a display lens including a holographic optical element, the method comprising: a step (a) of causing a first laser light, converging along a first irradiation direction, to be incident on a first surface of a photosensitive substrate in which a substrate is coated with a photosensitive material; and a step (b) of causing a second laser light, diverging along a second irradiation direction, to be incident on a second surface of the photosensitive substrate while the step (a) is performed, the second surface being opposite from the first surface, wherein during the step (b), parallel light is incident on a lens array having a top surface on which a plurality of lens portions configured to convert the parallel light into diverging light is arranged, such that the second laser light is radiated toward the second surface of the photosensitive substrate at a plurality of points through respective ones of the plurality of lens portions. ### Claim 8 (depends on 7) The method according to claim 7, wherein the substrate is a light-transmissive lens. ### Claim 9 (depends on 7) The method according to claim 7, further comprising a step (c) of stacking the photosensitive substrate and a light-transmissive lens by interposing a light-transmissive adhesive between the photosensitive substrate and the light-transmissive lens, wherein the photosensitive substrate is a light-transmissive film. ### Claim 10 (depends on 7) A head-mounted display device comprising: the display lens manufactured by the method according to claim 7; and an optical engine configured to cause image light, diverging along a third irradiation direction, to be incident on a holographic optical element included in the display lens. ### Claim 11 (depends on 10) The head-mounted display device according to claim 10, wherein an interval between centers of adjacent ones of a plurality of exit pupils formed in the display lens is 4 to 6 mm.