Optical device and camera device

Abstract

The present invention provides an optical device and a camera device, wherein a lens unit is provided with a ganged plate (204), having a ganged key (203) extending in an optical axis direction and rotating gangedly along with a rotation of a zooming loop; a rear element lens frame (107), having a helical part (201) on an external circumference surface containing an arris extending in a direction inclined relative to the optical axis direction, and a key groove (202) jointed with the ganged key (203) rotating along with the rotation of the ganged plate (204); and a back lens cone, arranged on an external side of the rear element lens frame (107) and showing a approximate cylinder shape, and having helical parts for forming a helical mechanism by conjoining with the helical part (201) on an inner circumference surface, so as to support the rear element lens frame (107), the ganged key (203) and the key groove (202) movably in the optical axis direction through the helical mechanism, inclined in a direction different from the helical part (201) relative to the optical axis direction. Thereby, by means of a simple structure, it is capable of preventing the position of the optical component from departure caused by a clearance between the helical part and the helical support part, and the mobile performance of the optical component will not be reduced.

Description

technical field [0001] The present invention relates to an optical device that uses a screw mechanism to move an optical member in an optical axis direction, and an imaging device including the optical device. Background technique [0002] Conventionally, there is a lens barrel in which the lens frame is displaced along the edge of the spiral portion by engaging the outer peripheral surface of the lens frame provided in the lens barrel with the inner peripheral surface of the lens barrel, thereby displacing the lens frame. Move the lens frame in the direction of the optical axis. There is a technique in which, in such a lens barrel, an interlocking key rotatable about the optical axis is engaged with a key groove provided on the outer periphery of the lens frame, and the lens frame is rotated as the interlocking plate rotates. [0003] In such a technique, when a gap (gutter, gutter) occurs between the helical parts provided on the outer peripheral surface of the lens frame...

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Problems solved by technology

[0007] However, in the prior art described in the above-mentioned Patent Document 1, since it is necessary to add an active part for the interlocking key to act on the side of the mating surface between the lens frame and the interlocking key, there is an increase in the number of parts and the manufacturing cost of the lens barrel. additional questions

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