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US 2017/0290497 A1Published application
Image pickup unit and endoscope
AssigneeOlympus Corporation
InventorsYuichi WATAYA, Akira MURAMATSU, Yuki Nakayama
Life of this patent
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Abstract
To provide an image pickup unit that can prevent axis deviation of a movable lens barrel and obtain high-quality picked-up image, a stopper member is positioned and fixed in a state in which the stopper member is abutted against an outer circumferential surface of a rear group lens barrel, movement of a movable lens barrel to a retraction side along a photographing optical axis is restricted by contact of a stopper section of the stopper member and an operation rod, and a movable lens is held in a position for realizing a second focal length.
Claims9
An image pickup unit comprising:
- an observation optical system of a focus switching type including a fixed lens and a movable lens;
- a fixed barrel that holds the fixed lens;
- a movable barrel disposed in the fixed barrel to be capable of advancing and retracting in a direction along a photographing optical axis of the observation optical system, the movable barrel holding the movable lens;
- and
- a stopper member positioned and fixed in a state in which the stopper member is abutted against an outer circumferential surface of the fixed barrel by surface contact, the stopper member restricting movement of the movable barrel in one direction of the photographing optical axis through contact with the movable barrel to thereby hold the movable lens in a position for realizing one focal length of the observation optical system.
2 more elements
Dependencies are inferred from the claim text.