JP2010197621A5

JP2010197621A5 -

Info

Publication number: JP2010197621A5
Application number: JP2009041396A
Authority: JP
Filing date: 2009-02-24
Publication date: 2013-04-11
Anticipated expiration: 2029-02-24

Description

そこで、上記課題を解決すべく、本発明の第１の態様として、固定筒に対して変位する光学部品を含む光学系と、光学部品を保持する保持枠と、保持枠に結合され、光学系の光軸と平行に延在する案内軸と、合焦する場合に案内軸を光軸方向に移動させ、変倍する場合に案内軸を保持する直進駆動部と、直進駆動部を保持し、変倍する場合に固定筒に対して移動可能な保持筒とを備えるレンズ鏡筒が提供される。

Accordingly, in order to solve the above problems, as a first aspect of the present invention, an optical system including an optical component that is displaced with respect to a fixed cylinder, a holding frame that holds the optical component, and a holding frame are coupled to the optical system. A guide shaft extending in parallel with the optical axis of the optical axis, moving the guide shaft in the optical axis direction when focusing and holding the guide shaft when zooming, and holding the linear drive portion , A lens barrel is provided that includes a holding barrel that is movable relative to a stationary barrel when zooming.

Claims

An optical system including an optical component that is displaced with respect to the fixed cylinder;
A holding frame for holding the optical component;
A guide shaft coupled to the holding frame and extending parallel to the optical axis of the optical system;
A linear drive unit that moves the guide shaft in the optical axis direction when focusing and holds the guide shaft when zooming;
Wherein the linear driving unit holds a lens barrel and a movable holding tube relative to the fixed cylinder when the magnification is changed.

Having one of a cam groove that is inclined with respect to the optical axis and a cam pin that engages with the cam groove, and includes a drive ring that rotates around the optical axis when zooming;
The lens barrel according to claim 1, wherein the holding cylinder has the other of the cam groove and the cam pin and moves in the optical axis direction when zooming.

The lens barrel according to claim 2, wherein the cam pin is disposed in the vicinity of the guide shaft in a circumferential direction of the optical component.

The lens mirror according to any one of claims 1 to 3, wherein the guide shaft is inserted into a fitting hole having a shape complementary to a peripheral surface of the guide shaft, and is slidably positioned in the axial direction. Tube.

The holding cylinder has a pair of fitting parts arranged with the rectilinear drive part sandwiched in the optical axis direction,
The lens barrel according to claim 4, wherein each of the pair of fitting portions has a fitting hole having a shape complementary to a peripheral surface of the guide shaft.

An operation ring that is operated from the outside of the lens barrel and rotates around the optical axis;
A rotation detector for detecting the amount of rotation of the operation ring,
The lens barrel according to any one of claims 1 to 5, wherein the rectilinear drive unit moves the guide shaft in the optical axis direction according to the rotation amount detected by the rotation detection unit.

A rectilinear detection unit for detecting a movement amount of the guide shaft driven by the rectilinear drive unit;
The lens barrel according to any one of claims 1 to 6, further comprising: a control unit that controls a drive amount of the rectilinear drive unit according to a detection result of the rectilinear detection unit.

The lens barrel according to any one of claims 1 to 7,
An imaging device comprising: an imaging unit that records an image formed by the lens barrel.