Patent ID: 9106848
Filing Date: 2015-08-11
Classification: A61B,G02B,H04N

Abstract:
1. An optical unit comprising: a plurality of lenses that form an object image on an image plane that is a light-receiving surface of a solid-state image pickup device; an aperture diaphragm; and an optical member disposed on the image plane side relative to the aperture diaphragm, the optical member including a coating surface resulting from a multi-layer interference film that transmits visible light and cuts off light having a particular wavelength being formed thereon, wherein an F number FNO, a maximum image height IH, and a distance Δd between a paraxial image formation position in a ghost optical path on which a light beam emitted from the aperture diaphragm is reflected by the image plane and further reflected by the coating surface and reaches the image plane again and the image plane satisfy (Expression 1):