HEAD-UP DISPLAY AND MOVING BODY EQUIPPED WITH HEAD-UP DISPLAY

• US 20180039077A1
• Filed: 10/10/2017
• Published: 02/08/2018
• Est. Priority Date: 06/26/2015
• Status: Active Grant

• Current Assignee: Panasonic Automotive Systems Company of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: KUZUHARA, SATOSHI, SUEYOSHI, MASAFUMI, OKAYAMA, HIROAKI, HAYASHI, KATSUHIKO
• Granted Patent: US 10,281,722 B2
• Time in Patent Office: Days
• CPC Class Codes: B60K 35/00 Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
• CPC Class Codes: B60R 11/02 for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
• CPC Class Codes: G02B 17/0663 off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements
• CPC Class Codes: G02B 17/0816 off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements
• CPC Class Codes: G02B 2027/011 comprising device for correcting geometrical aberrations, distortion
• CPC Class Codes: G02B 2027/013 comprising a combiner of particular shape, e.g. curvature
• CPC Class Codes: G02B 2027/014 comprising information/image processing systems
• CPC Class Codes: G02B 2027/0145 creating an intermediate image
• CPC Class Codes: G02B 2027/0154 with movable elements
• CPC Class Codes: G02B 2027/0185 Displaying image at variable distance
• CPC Class Codes: G02B 27/01 Head-up displays
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 27/0176 characterised by mechanical features
• CPC Class Codes: G02B 27/0179 Display position adjusting means not related to the information to be displayed

Abstract

A head-up display projects an image on a windshield to allow a viewer to visually observe a virtual image. The head-up display includes a display device, a relay optical system, and a projection optical system. The display device displays an image. The relay optical system provides the image displayed by the display device as an intermediate image. The projection optical system reflects the intermediate image provided by the relay optical system to project the intermediate image on the windshield.

Claims

1. A head-up display configured to project an image on a transmissive reflection member to allow an observer to visually observe the image as a virtual image, the head-up display comprising:

a display device configured to display an image;

a relay optical system including a first relay mirror having a concave reflection surface, and configured to provide the image displayed by the display device as an intermediate image; and

a projection optical system including a first projection mirror having a concave reflection surface, and configured to reflect the intermediate image provided by the relay optical system to project the intermediate image on the reflection member.

2. The head-up display according to claim 1, wherein:

the relay optical system includes a second relay mirror between the first relay mirror and the projection optical system along an optical path from the display device to the reflection member; and

the projection optical system includes a second projection mirror between the relay optical system and the first projection mirror along the optical path.

3. The head-up display according to claim 2, wherein each of the second relay mirror and the second projection mirror has a convex reflection surface.

4. The head-up display according to claim 2, wherein the first relay mirror has higher power than any other mirror disposed in the relay optical system and the projection optical system.

5. The head-up display according to claim 1, wherein the intermediate image provided by the relay optical system is larger than the image displayed by the display device.

6. The head-up display according to claim 1, wherein the relay optical system as a whole has a positive power.

7. The head-up display according to claim 1, wherein the projection optical system as a whole has a positive power.

8. The head-up display according to claim 1, wherein the display device includes an image display unit and a drive unit configured to shifting the image display unit.

9. The head-up display according to claim 1, wherein the relay optical system satisfies a conditional expression (1):

1.4<

β

<

4.0 

 

(1)

where δ

is a lateral magnification of the relay optical system.

10. The head-up display according to claim 1, wherein, among light rays emanating from the display device, a reference light ray reaching a center of a viewpoint region for the viewer is inclined with respect to a line orthogonal to a display surface of the display device.

11. A moving body comprising:

a main body;

a driving unit configured to move the main body; and

the head-up display as defined in claim 1, and mounted to the main body.