US 11,927,742 B2
Illumination device having wedge prisms and driving portion with multiple gears
Ritsuya Oshima, Tokyo (JP); Masashige Suwa, Tokyo (JP); Akinori Heishi, Tokyo (JP); Muneharu Kuwata, Tokyo (JP); and Kuniko Kojima, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/056,771
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jun. 4, 2018, PCT No. PCT/JP2018/021374
§ 371(c)(1), (2) Date Nov. 19, 2020,
PCT Pub. No. WO2019/234796, PCT Pub. Date Dec. 12, 2019.
Prior Publication US 2021/0263301 A1, Aug. 26, 2021
Int. Cl. G02F 1/29 (2006.01); B60Q 1/04 (2006.01); F21V 5/02 (2006.01); G02B 26/10 (2006.01); G03B 21/13 (2006.01); G03B 21/14 (2006.01)
CPC G02B 26/10 (2013.01) [B60Q 1/04 (2013.01); F21V 5/02 (2013.01); G02F 1/29 (2013.01); G03B 21/13 (2013.01); G03B 21/14 (2013.01); G03B 21/142 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An illumination device comprising:
a light source to emit light;
a pair of wedge prisms to receive the light and deflect the received light; and
a driving portion including a first gear and a second gear, the driving portion causing the pair of wedge prisms to rotate about a first rotation axis of the pair of wedge prisms by using the first gear and the second gear,
wherein the pair of wedge prisms include a first wedge prism held by a first barrel and a second wedge prism held by a second barrel;
wherein the first barrel is disposed inside the second barrel;
wherein a third gear whose center axis is the first rotation axis is provided on an outer periphery of the first barrel;
wherein a fourth gear whose center axis is the first rotation axis is provided on an inner periphery of the second barrel;
wherein the first gear is disposed on an outer peripheral side of the third gear and meshes with the third gear; and
wherein the second gear is disposed on an inner peripheral side of the fourth gear and meshes with the fourth gear.