US 12,117,561 B2
Optical apparatus, and in-vehicle system and moving apparatus each including the same
Masatsugu Nakano, Tochigi (JP); Ryo Iijima, Tochigi (JP); and Shin Kuwashiro, Tochigi (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jan. 13, 2022, as Appl. No. 17/575,216.
Claims priority of application No. 2021-007468 (JP), filed on Jan. 20, 2021; application No. 2021-007469 (JP), filed on Jan. 20, 2021; and application No. 2021-007470 (JP), filed on Jan. 20, 2021.
Prior Publication US 2022/0229156 A1, Jul. 21, 2022
Int. Cl. G01S 7/481 (2006.01); G01S 17/931 (2020.01)
CPC G01S 7/4811 (2013.01) [G01S 7/4817 (2013.01); G01S 17/931 (2020.01)] 20 Claims
OG exemplary drawing
 
1. An optical apparatus comprising:
a deflection unit configured to deflect illumination light from a light source to scan an object and to deflect reflected light from the object;
a light guiding unit configured to guide the illumination light from the light source to the deflection unit and to guide the reflected light from the deflection unit to a light receiving element; and
an optical system configured to guide the illumination light from the deflection unit to the object and to guide the reflected light from the object to the deflection unit,
wherein the optical system includes a front lens unit that is configured to form an intermediate image of the object and consists of lenses located closer to the object than the intermediate image and a rear lens unit that consists of lenses located closer to the deflection unit than the intermediate image,
wherein the rear lens unit consists of three or more and five or less positive lenses, and
wherein the following conditional expression is satisfied:

OG Complex Work Unit Math
where R1B1 is a curvature radius of a lens surface on the object side for a first lens closest to the deflection unit in the rear lens unit, and R2B1 is a curvature radius of a lens surface on the deflection unit side for the first lens.