Patent ID: 11953665
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G  B | IPC B  G

Claim 18:
19. An apparatus comprising:
a first reflection optical system comprising a plurality of reflecting surfaces which reflects a light; and
a frame,
wherein a part of the plurality of reflecting surfaces is a reflecting surface provided on the frame,
wherein, among the plurality of reflecting surfaces, a final-stage reflecting surface configured to reflect the light toward a first final focusing surface is a first reflecting surface formed on a surface of a first member, and
wherein a change of peripheral light quantity of the light at a predetermined position in a case where a position and orientation of the first reflecting surface with respect to the frame is changed is greater than a change of peripheral light quantity of the light at the predetermined position in a case where a position and orientation of the reflecting surface provided on the frame with respect to the frame is changed.