Head-up display device

Patent metadata

Field	Value
Publication number	US-2018024357-A1
Application number	US-201715624281-A
Country	US
Kind code	A1
Filing date	Jun 15, 2017
Priority date	Jul 25, 2016
Publication date	Jan 25, 2018
Grant date	—

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)

First claim

What is claimed is:

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.

2 . 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)

3 . 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.

4 . 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.

5 . The head-up display device according to claim 3 , further comprising:
a diffuser that is provided at a formation position of the intermediate image.

6 . The head-up display device according to claim 4 , further comprising:
a diffuser that is provided at a formation position of the intermediate image.

7 . 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.

8 . 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.

9 . 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.

10 . 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.

11 . 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.

12 . 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.

13 . 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.

14 . 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.

15 . 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.

16 . 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.

17 . The head-up display device according to claim 1 ,
wherein the primary display image is an image displayed on an image display element.

18 . 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.

19 . 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.

20 . The head-up display device according to claim 1 ,
wherein a lens, which i

Assignees

• Fujifilm Corp

Inventors

• Yamamoto Chikara

Classifications

• G06T3/20

  Linear translation of whole images or parts thereof, e.g. panning · CPC title

• G02B27/0101 Primary

  characterised by optical features (G02B27/0172 takes precedence) · CPC title

• G02B13/16

  for use in conjunction with image converters or intensifiers {, or for use with projectors, e.g. objectives for projection TV} · CPC title

• G06T3/40

  Scaling of whole images or parts thereof, e.g. expanding or contracting · CPC title

• G02B2027/0145

  creating an intermediate image · CPC title