# US 10,502,972 B2 · Image display device and mobile object > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,972 B2 - Document ID: US10502972B2 - Status: Granted - Kind: B2 - Application number: 16/011,209 - Filed: 2018-06-18 - Published: 2018-10-25 - Granted: 2019-12-10 - Earliest claimed: 2014-02-05 - Assignees: Ricoh Company, Ltd. - Applicants: Ricoh Company, Ltd. - Inventors: Kenichiroh Saisho; Makoto Inamoto - Web page: https://patentgrep.com/patent/US10502972B2 ## CPC - G02B 27/48: Laser speckle optics - G02B 3/0006: {Arrays (G02B3/02, G02B5/188 take precedence)} - G02B 27/0081: {with means for altering, e.g. enlarging, the entrance or exit pupil} - G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)} - G03B 21/2073: {Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197)} - H04N 9/3129: {scanning a light beam on the display screen (scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161)} - H04N 9/3161: {using laser light sources (using laser beams scanning the display screen H04N9/3129)} - G02B 3/0056: {arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses (G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085)} - G02B 26/101: {with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129)} - G02B 27/0905: {Dividing and/or superposing multiple light beams} - G02B 27/0911: {Anamorphotic systems} - G02B 27/0961: {Lens arrays (lens arrays per se G02B3/0006)} - G02B 27/1033: {having a single light modulator for all colour channels} - G02B 2027/0114: {comprising dichroic elements} - G02B 2027/0118: {comprising devices for improving the contrast of the display / brillance control visibility} - G02B 2027/0123: {comprising devices increasing the field of view} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An image display device including a laser light source; an optical element; and a transmitting-reflecting member, the image display device which displays an image by forming the image by light which is emitted from the laser light source and making image light after forming the image to be incident on the transmitting-reflecting member, wherein the laser light source is arranged such that there are more S polarization components of the image light which is incident on the transmitting-reflecting member with respect to the transmitting-reflecting member than P polarization components, and a mobile object including the image display device. ## Claims ### Claim 1 An image display device, comprising: a laser light source; an optical element; and a transmitting-reflecting member, wherein the image display device displays an image by forming the image by light that is emitted from the laser light source and makes image light after forming the image be incident on the transmitting-reflecting member, wherein the laser light source is arranged such that there are more S polarization components of the image light that is incident on the transmitting-reflecting member with respect to the transmitting-reflecting member than P polarization components, wherein the optical element is arranged on an optical path between the laser light source and the transmitting-reflecting member, and is a lens array which includes a plurality of lenses on which the image is formed, an effective cross-section of the light that is emitted from the laser light source is one of vertically long and horizontally long with respect to the transmitting-reflecting member, and an effective cross-section of light that has been transmitted through the lens array is the other of horizontally long and vertically long with respect to the transmitting-reflecting member. ### Claim 2 (depends on 1) The image display device according to claim 1, wherein each of the plurality of lenses is arranged such that the direction of a long diameter and the direction of a short diameter of the effective cross-section of the light which is emitted from the laser light source are reversed before and after the light which is emitted from the laser light source is transmitted through each of the lenses. ### Claim 3 (depends on 2) The image display device according to claim 2, wherein each of the plurality of lenses has different curvatures regarding first and second directions which are perpendicular to each other in a plane perpendicular to an optical axis. ### Claim 4 (depends on 3) The image display device according to claim 3, wherein the direction of the short diameter of the effective cross-section of the light which is emitted from the laser light source coincides with a direction of one of the first and second directions of each of the lenses in which a curvature is larger. ### Claim 5 (depends on 2) The image display device according to claim 2, wherein the image includes a long axis direction and a short axis direction and the long axis direction of the image is aligned with a long diameter direction of an effective cross-section of light which passed through the plurality of lenses. ### Claim 6 (depends on 1) The image display device according to claim 1, wherein an effective cross-section of the image light which is incident on the transmitting-reflecting member is horizontally long. ### Claim 7 (depends on 1) The image display device according to claim 1, wherein the effective cross-section is a portion in which a relative intensity is 20% to 80% in a cross-section of light in the optical path between the laser light source and the transmitting-reflecting member. ### Claim 8 (depends on 1) The image display device according to claim 1, wherein the image is horizontally long. ### Claim 9 (depends on 1) The image display device according to claim 1, wherein a ratio of the S polarization components to the light which is emitted from the laser light source is 100%. ### Claim 10 (depends on 1) The image display device according to claim 1, wherein an incidence angle of the image light which is incident on the transmitting-reflecting member is approximately Brewster's angle. ### Claim 11 (depends on 1) The image display device according to claim 1, wherein the laser light source is a semiconductor laser. ### Claim 12 (depends on 1) A mobile object which is driven by a driver, comprising: the image display device according to claim 1, wherein the driver visually recognizes a virtual image of the image via the transmitting-reflecting member. ### Claim 13 (depends on 12) The mobile object according to claim 12, wherein the transmitting-reflecting member is a window member through which the driver visually recognizes outside of the mobile object.