US 12,228,848 B2
Optical deflection apparatus and image projection apparatus
Tsukasa Yamada, Tokyo (JP)
Assigned to MITSUMI ELECTRIC CO., LTD., Tokyo (JP)
Filed by Tsukasa Yamada, Tokyo (JP)
Filed on Jan. 11, 2022, as Appl. No. 17/647,612.
Claims priority of application No. 2021-004947 (JP), filed on Jan. 15, 2021.
Prior Publication US 2022/0229356 A1, Jul. 21, 2022
Int. Cl. G03B 21/20 (2006.01); G02B 26/10 (2006.01)
CPC G03B 21/2066 (2013.01) [G02B 26/101 (2013.01); G03B 21/2006 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An optical deflection apparatus comprising:
an optical deflection part configured to deflect light incident on a reflection surface by swinging the reflection surface about a swing axis; and
a light transmission plate configured to transmit the light deflected by the optical deflection part and project an image on a scan-target surface,
wherein an inclination angle of the light transmission plate with reference to a reference surface is equal to or greater than twice a maximum swing angle of the reflection surface with reference to the reference surface, the inclination angle of the light transmission plate being configured such that the light, which is reflected by a surface of the light transmission plate and goes back to the optical deflection part, is prevented from reaching the scan-target surface.