# US 10,371,942 B2 · Heads-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 10,371,942 B2 - Document ID: US10371942B2 - Status: Granted - Kind: B2 - Application number: 15/624,281 - Filed: 2017-06-15 - Published: 2018-01-25 - Granted: 2019-08-06 - Earliest claimed: 2016-07-25 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Chikara Yamamoto - Web page: https://patentgrep.com/patent/US10371942B2 ## 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 changer configured to change a distance between the observer and the virtual image; and a display-size changer configured to change 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: a size of the primary display image in an arbitrary direction when the virtual image is displayed at a position 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 closest to the observer, Bf: a display magnification of the virtual image at the position farthest from the observer, and Bn: the display magnification of the virtual image at the position closest to the observer, and wherein the size of the primary display image in the arbitrary direction indicates the size of either of a horizontal size and a vertical size of the primary display image corresponding to a horizontal direction and a vertical direction at a time of display of a virtual image, and the display magnification of the virtual image pertains to a ratio of the size of the primary display image in relation to the display size of the virtual image in the arbitrary direction. ### 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 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 4 (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 5 (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 changer. ### Claim 6 (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 changer. ### 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 changer. ### Claim 8 (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 changer. ### Claim 9 (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 changer. ### Claim 10 (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 11 (depends on 10) The head-up display device according to claim 10, further comprising: a diffuser that is provided at a formation position of the intermediate image. ### Claim 12 (depends on 11) The head-up display device according to claim 11, 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 changer. ### Claim 13 (depends on 11) The head-up display device according to claim 11, 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 changer. ### Claim 14 (depends on 10) The head-up display device according to claim 10, 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 changer. ### Claim 15 (depends on 14) The head-up display device according to claim 14, 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 changer. ### Claim 16 (depends on 10) The head-up display device according to claim 10, 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 changer. ### 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 reflector, 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 changer. ### 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 changer. ### 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 changer.