Camera unit and endoscope

Abstract

The imaging unit (30) has: the observation optical system (33) of the focus switching mode, which includes a fixed lens (56a, 56b) and a movable lens (66); ) to hold; the moving frame (65), which is configured to move forward and backward freely along the direction of the photographing optical axis (O) of the observation optical system (33), holds the moving lens (66); and the correction frame (47), which is fixed in the fixed frame (55, 57), so that the movable frame (65) can be accommodated in a way that the movable frame (65) can move forward and backward freely, and the correction frame (47) has a passage and a movable frame (65) Abutting against the stopper (60) that restricts the movement of the moving frame (65) towards one direction of the photographic optical axis (O), the correction frame (47) can be finely adjusted to achieve a focal length of the observation optical system (33).

Description

technical field [0001] The present invention relates to an imaging unit capable of changing the optical characteristics of an observation optical system, and an endoscope provided with the imaging unit. Background technique [0002] As is well known, endoscopes are widely used for observation, treatment, and the like in living bodies (inside body cavities), and for inspection, repair, and the like in industrial plants. [0003] In recent years, among such endoscopes, there are endoscopes that use an imaging unit that uses a focus function for photographic imaging or a zoom function for adjusting magnifications such as wide-angle / telephoto by using an observation optical system Move in the direction of the photographic optical axis to change the focal length. In addition, the technology of an imaging unit capable of changing the focal length in this way is not limited to being used in an endoscope, but can be used in various imaging devices. [0004] For example, as disclos...

AI Technical Summary

Problems solved by technology

[0008] However, in the optical fine adjustment technique disclosed in Japanese Patent Application Laid-Open No. 2009-300761, since the position where the adjustment member comes into contact with the end of the connecting rod of the moving lens frame is finely adjusted, there is a tendency for the moving lens frame to tilt. This leads to issues such as axis misalignment

As a result, there is a problem that high-quality captured images cannot be obtained

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