Imaging unit and endoscope

Abstract

An imaging unit 30 is provided with: a focal-point-switching observation optical system 33 including fixed lenses 56a, 56b and a moving lens 66; fixing frames 55, 57 for retaining the fixed lenses 56a, 56b; a moving frame 65 for retaining the moving lens 66, the moving frame 65 being provided so as to be able to move in advancing and retreating fashion in a direction along the imaging optical axis O of the observation optical system 33; and a correction frame 47 which is finely adjustable so as to realize one focal distance of the observation optical system 33, the correction frame 47 being fixed inside the fixing frames 55, 57, the correction frame 47 accommodating the moving frame 65 so that the moving frame 65 can advance and retreat, and the correction frame 47 being provided with a stopper 60 for coming in contact with the moving frame 65 and thereby restricting movement thereof in one direction of the imaging optical axis O.

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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