# US 2018/0024357 A1 · Head-up display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0024357 A1 - Document ID: US20180024357A1 - Status: Published application - Kind: A1 - Application number: 15/624,281 - Filed: 2017-06-15 - Published: 2018-01-25 - Earliest claimed: 2016-07-25 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Chikara YAMAMOTO - Web page: https://patentgrep.com/patent/US20180024357A1 ## CPC - G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)} - G02B 13/16: for use in conjunction with image converters or intensifiers {, or for use with projectors, e.g. objectives for projection TV} - G02B 27/0149: {characterised by mechanical features (G02B27/0176 takes precedence)} - G02B 27/0179: {Display position adjusting means not related to the information to be displayed} - G06T 3/20: Linear translation of whole images or parts thereof, e.g. panning - G06T 3/40: Scaling of whole images or parts thereof, e.g. expanding or contracting - G02B 2027/0145: {creating an intermediate image} - G02B 2027/0154: {with movable elements} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract There is provided a head-up display device that reflects and enlarges an image, which is displayed on an image display element, by a curved mirror, allows an observer to visually recognize the image as a virtual image, can change a virtual image display position, and is small. A head-up display device, which reflects and enlarges a displayed primary display image by a curved mirror and allows an observer to visually recognize the primary display image as a virtual image, includes a virtual-image-position change portion of changing a distance between the observer and the virtual image and a display-size change portion of changing the display size of the primary display image, and is adapted to satisfy the following conditional expression (1). 2.5<(Hf/Hn)/(Bf/Bn)<15.0 (1) ## Claims ### Claim 1 A head-up display device that reflects and enlarges a displayed primary display image by a curved mirror to allow an observer to visually recognize the primary display image as a virtual image, the head-up display device comprising: a virtual-image-position change portion of changing a distance between the observer and the virtual image; and a display-size change portion of changing a display size of the primary display image, wherein the following conditional expression (1) is satisfied. 2.5<(Hf/Hn)/(Bf/Bn)<15.0 (1) where, Hf: the size of the primary display image in an arbitrary direction when the virtual image is displayed at a position of the farthest point farthest from the observer Hn: the size of the primary display image in the arbitrary direction when the virtual image is displayed at a position of the closest point closest to the observer Bf: the display magnification of the virtual image at the position of the farthest point Bn: the display magnification of the virtual image at the position of the closest point. ### Claim 2 (depends on 1) The head-up display device according to claim 1, wherein the following conditional expression (1-1) is satisfied. 3.5<(Hf/Hn)/(Bf/Bn)<12.0 (1-1) ### Claim 3 (depends on 1) The head-up display device according to claim 1, wherein the primary display image is an image that is formed as an intermediate image on the basis of image information by an optical system. ### Claim 4 (depends on 2) The head-up display device according to claim 2, wherein the primary display image is an image that is formed as an intermediate image on the basis of image information by an optical system. ### Claim 5 (depends on 3) The head-up display device according to claim 3, further comprising: a diffuser that is provided at a formation position of the intermediate image. ### Claim 6 (depends on 4) The head-up display device according to claim 4, further comprising: a diffuser that is provided at a formation position of the intermediate image. ### Claim 7 (depends on 3) The head-up display device according to claim 3, wherein the optical system is a projection optical system that forms an image, which is displayed on an image display element, as the intermediate image, and the projection optical system includes a plurality of lenses, changes the position of the virtual image by moving at least a part of the lenses along an optical axis to move the formation position of the intermediate image, and functions as the virtual-image-position change portion. ### Claim 8 (depends on 4) The head-up display device according to claim 4, wherein the optical system is a projection optical system that forms an image, which is displayed on an image display element, as the intermediate image, and the projection optical system includes a plurality of lenses, changes the position of the virtual image by moving at least a part of the lenses along an optical axis to move the formation position of the intermediate image, and functions as the virtual-image-position change portion. ### Claim 9 (depends on 5) The head-up display device according to claim 5, wherein the optical system is a projection optical system that forms an image, which is displayed on an image display element, as the intermediate image, and the projection optical system includes a plurality of lenses, changes the position of the virtual image by moving at least a part of the lenses along an optical axis to move the formation position of the intermediate image, and functions as the virtual-image-position change portion. ### Claim 10 (depends on 6) The head-up display device according to claim 6, wherein the optical system is a projection optical system that forms an image, which is displayed on an image display element, as the intermediate image, and the projection optical system includes a plurality of lenses, changes the position of the virtual image by moving at least a part of the lenses along an optical axis to move the formation position of the intermediate image, and functions as the virtual-image-position change portion. ### Claim 11 (depends on 3) The head-up display device according to claim 3, wherein the optical system is a projection optical system that forms an image, which is displayed on the image display element, as the intermediate image, and the projection optical system includes a plurality of lenses, changes the display size of the intermediate image by moving at least a part of the lenses along the optical axis, and functions as the display-size change portion. ### Claim 12 (depends on 4) The head-up display device according to claim 4, wherein the optical system is a projection optical system that forms an image, which is displayed on the image display element, as the intermediate image, and the projection optical system includes a plurality of lenses, changes the display size of the intermediate image by moving at least a part of the lenses along the optical axis, and functions as the display-size change portion. ### Claim 13 (depends on 5) The head-up display device according to claim 5, wherein the optical system is a projection optical system that forms an image, which is displayed on the image display element, as the intermediate image, and the projection optical system includes a plurality of lenses, changes the display size of the intermediate image by moving at least a part of the lenses along the optical axis, and functions as the display-size change portion. ### Claim 14 (depends on 6) The head-up display device according to claim 6, wherein the optical system is a projection optical system that forms an image, which is displayed on the image display element, as the intermediate image, and the projection optical system includes a plurality of lenses, changes the display size of the intermediate image by moving at least a part of the lenses along the optical axis, and functions as the display-size change portion. ### Claim 15 (depends on 7) The head-up display device according to claim 7, wherein the optical system is a projection optical system that forms an image, which is displayed on the image display element, as the intermediate image, and the projection optical system includes a plurality of lenses, changes the display size of the intermediate image by moving at least a part of the lenses along the optical axis, and functions as the display-size change portion. ### Claim 16 (depends on 8) The head-up display device according to claim 8, wherein the optical system is a projection optical system that forms an image, which is displayed on the image display element, as the intermediate image, and the projection optical system includes a plurality of lenses, changes the display size of the intermediate image by moving at least a part of the lenses along the optical axis, and functions as the display-size change portion. ### Claim 17 (depends on 1) The head-up display device according to claim 1, wherein the primary display image is an image displayed on an image display element. ### Claim 18 (depends on 1) The head-up display device according to claim 1, wherein a reflecting member, which is provided on a light path between the primary display image and the curved mirror and changes the length of the light path between the primary display image and the curved mirror, is provided as the virtual-image-position change portion. ### Claim 19 (depends on 1) The head-up display device according to claim 1, wherein a transparent medium, which is provided on a light path between the primary display image and the curved mirror and changes the length of an air-conversion-light path between the primary display image and the curved mirror, is provided as the virtual-image-position change portion. ### Claim 20 (depends on 1) The head-up display device according to claim 1, wherein a lens, which is provided on a light path between the primary display image and the curved mirror and changes a projection magnification of the primary display image at the curved mirror, is provided as the virtual-image-position change portion.