Image pickup unit for endoscope

摘要

An image pickup unit includes a dioptric system that reflects a luminous flux of an optical image incident on an optical lens group and performs optical path conversion, an image sensor in a bare state that is joined to the dioptric system, and includes a light receiving element that forms the optical image, and a light shielding member that is placed to be opposed to and cover at least surfaces around an optical axis of the optical lens group, except for a joining surface of the dioptric system to the image sensor, so that an air gap apart from the image sensor by a predetermined distance is provided, shields incidence of a harmful light onto the light receiving element, and is formed from a metal thin film.

主权项

1. An image pickup unit for an endoscope, comprising:
a prism that reflects a luminous flux of an optical image incident on an optical lens group and performs optical path conversion; an image sensor in a bare state that is joined to the prism, and includes a light receiving element on which the luminous flux is incident and forms the optical image; and a light shielding member that is placed to be opposed to and cover at least surfaces of the prism around an optical axis of the optical lens group, except for a joining surface of the prism to the image sensor so that an air gap apart from the image sensor by a predetermined distance is provided, shields incidence of a harmful light onto the light receiving element, and is formed from a metal thin film, wherein the light shielding member covers an inside of a same surface as a light receiving surface of the light receiving element and is provided to extend to a position where the light shielding member is superimposed on both side surfaces of the image sensor by a predetermined length with respect to the light receiving surface, the light shielding member being opposed to at least the surfaces of the prism around the optical axis of the optical lens group except for the joining surface of the prism to the image sensor to be apart therefrom with a first separation distance, and extended to a position where the light shielding member is superimposed on the both side surfaces of the image sensor by a second separation distance.