Light deflector, image projection apparatus, laser headlamp, head-mounted display, distance measurement apparatus, and mobile object

Patent metadata

Field	Value
Publication number	US-12379587-B2
Application number	US-202217654263-A
Country	US
Kind code	B2
Filing date	Mar 10, 2022
Priority date	Mar 22, 2021
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A light deflector includes: a movable portion; a support having one end connected to the movable portion to elastically support the movable portion, the support including a support thick portion; a drive beam connected to the other end of the support to deform the support to cause the movable portion to oscillate about an oscillation axis; a connecting portion connecting the other end of the support to the drive beam, the connecting portion including a connecting thick portion; and a support frame supporting the drive beam via a fixing portion. The support thick portion and the connecting thick portion are connected to each other.

First claim

The invention claimed is:

1. A light deflector comprising:
a movable member;
a support having one end connected to the movable member to elastically support the movable member;
a drive beam connected to another end of the support to deform the support to cause the movable member to oscillate about an oscillation axis;
a connector disposed between the another end of the support and the drive beam; and
a support frame supporting the drive beam via a fixing member, wherein
the support includes a first support and a second support, the second support having a thickness larger than a thickness of the first support in a first direction perpendicular to the oscillation axis, the second support having a width smaller than a width of the first support in a second direction perpendicular to the oscillation axis, the first direction being different from the second direction.

2. The light deflector according to claim 1 ,
wherein the connector includes a first connector and a second connector, the second connector having a thickness larger than a thickness of the first connector, the second connector being connected to the second support, and
wherein the drive beam includes a first drive beam portion and a second drive beam, the second drive beam having a thickness larger than a thickness of the first drive beam, the second drive beam being connected to the second connector.

3. The light deflector according to claim 1 ,
wherein the movable member includes a first movable member and a second movable member, the second movable member having a thickness larger than a thickness of the first movable member, the second movable member being connected to the second support.

4. The light deflector according to claim 1 ,
wherein the second connector extends toward the fixing member.

5. The light deflector according to claim 4 ,
wherein the second connector has a first width and a second width along the oscillation axis, the first width being larger than the second width such that the second connector becomes wider toward the support.

6. An image projection apparatus comprising:
a light source unit to emit light;
the light deflector according to claim 1 to deflect the light emitted from the light source unit; and
an optical system to form an image with the light deflected by the light deflector and project the image.

7. The image projection apparatus according to claim 6 ,
wherein the light source unit includes:
multiple light sources to emit light beams having different wavelengths; and
a combiner to combine the light beams emitted from the multiple light sources into one light beam to be deflected by the light deflector and projected by the image projection apparatus.

8. The image projection apparatus according to claim 7 ,
wherein the image projection apparatus is a head-up display.

9. A laser headlamp comprising:
a light source to emit light;
the light deflector according to claim 1 to deflect the light emitted from the light source; and
a transparent plate having a surface covered with fluorescent material, the transparent plate to transmit the light deflected by the light deflector to convert the light transmitted through the transparent plate into white light and allow the white light to be emitted therefrom.

10. A head-mounted display comprising:
a light source to emit light;
the light deflector according to claim 1 to deflect the light emitted from the light source;
a light guide plate to guide the light deflected by the light deflector; and
a mirror to reflect the light guided by the light guide plate to eyes of a user wearing the head-mounted display to allow the user to observe an image formed with the light.

11. A distance measurement apparatus comprising:
a light source to emit light;
the light deflector according to claim 1 to deflect the light emitted from the light source to irradiate an object with the deflected light;
a photosensor to receive light reflected from the object; and
circuitry to obtain output based on the received light from the photosensor and calculate a distance to the object based on the output.

12. A mobile object comprising the image projection apparatus according to claim 8 .

13. A mobile object comprising the laser headlamp according to claim 9 .

14. A mobile object comprising the distance measurement apparatus according to claim 11 .

15. The light deflector according to claim 1 ,
wherein the first support is a silicon active layer, and
wherein the second support is disposed below the silicon active layer.

Assignees

• Akanuma Goichi
• Ricoh Co Ltd

Inventors

• Akanuma Goichi

Classifications

• B60K35/80

  Arrangements for controlling instruments · CPC title

• G02B2027/0154

  with movable elements · CPC title

• B60K35/23

  Head-up displays [HUD] (optical aspects of head-up displays G02B27/01) · CPC title

• B60K2360/334

  Projection means · CPC title

• B60K2360/23

  using reflectors · CPC title