JP2014186225A5

JP2014186225A5 -

Info

Publication number: JP2014186225A5
Application number: JP2013062192A
Authority: JP
Filing date: 2013-03-25
Publication date: 2016-05-19
Anticipated expiration: 2033-03-25

Description

本発明に係るレンズ鏡筒は、光軸と直交する面を有するカム溝が形成されたカム筒と、前記カム溝の前記直交する面と線接触して前記カム溝と係合し、光軸方向に移動可能な係合部を有する回転位置検出部材とを備え、前記回転位置検出部材は、前記係合部が前記固定筒の内側を向くように前記固定筒の内径側に固定されており、前記カム筒の回転に応じて前記係合部が前記カム溝内を移動しながら前記光軸方向で移動するときの前記光軸方向の移動量に基づいて前記カム筒の回転位置を検出することを特徴とする。 A lens barrel according to the present invention, a cam barrel cam groove having a plane orthogonal to the optical axis is formed, and engaged with the cam groove the orthogonal contact surfaces with the line of the cam groove, the optical axis and a rotational position detecting member that having a engagement section movable in a direction, the rotational position detecting member, the engaging portion is fixed on the inner diameter side of the fixed barrel so as to face the inside of the fixed tube And the rotational position of the cam cylinder is determined based on the amount of movement in the optical axis direction when the engaging portion moves in the optical axis direction while moving in the cam groove according to the rotation of the cam cylinder. characterized in that it detects.

更に、図３に示す状態では、直進筒１５が最も撮像面側に位置している。このとき、直進筒１５に設けた切り欠き形状部１５ｂ内にリニアポジションセンサ２９が入り込む位置関係とすると、直進筒移動コロ３２を保持する保持部１５ａをより撮像面側に配置することが可能になる。これにより、直進筒１５のストロークを確保することができる。 Further, in the state shown in FIG. 3, the rectilinear cylinder 15 is located closest to the imaging surface. In this case, when a positional relationship in which the linear position sensor 29 enters the notched shape portion 15 b provided in the rectilinear barrel 15, is possible to arrange the holder 15 a for holding the rectilinear barrel moving roller 32 more on the imaging surface side It becomes possible. As a result, the stroke of the straight cylinder 15 can be ensured.

Claims

A fixed cylinder;
A cam cylinder in which a cam groove having a surface perpendicular to the optical axis is formed;
The contacts the surface perpendicular to the line of the cam grooves engaged with the cam groove, and a rotational position detecting member that having a engagement section movable in an optical axis direction,
The rotation position detection member is fixed to the inner diameter side of the fixed cylinder so that the engagement part faces the inside of the fixed cylinder, and the engagement part is located in the cam groove according to the rotation of the cam cylinder. a lens barrel, characterized in that it detects the rotational position of the cam barrel, based on the movement amount of the optical axis direction when moving the optical axis direction while moving.

A rotation operation member operated to rotate,
The lens barrel according to claim 1, wherein the cam barrel rotates integrally with the rotation operation member.

A straight cylinder arranged on the outer diameter side of the cam cylinder;
The rectilinear tube has a notch-shaped portion on the imaging surface side when the lens barrel is attached to the camera body,
Wherein when the straight barrel closer to the imaging surface side, a lens barrel according to claim 1 or 2, characterized in the early days write enters said rotational position detecting member in the shape of the cutout portion.

The cam cylinder has a cam groove for a rectilinear cylinder that engages with the rectilinear cylinder,
The rectilinear cylinder has a rectilinear cylinder moving roller that engages with the cam groove for the rectilinear cylinder,
4. The lens barrel according to claim 3, wherein in the rectilinear barrel, the rectilinear barrel moving roller is disposed on an imaging surface side when the lens barrel is attached to a camera body.

The fixed barrel, the lens barrel according to any one of claims 1 to 4, characterized in that it has an appearance portion exposed to the exterior.

Optical apparatus characterized by having a lens barrel according to any one of claims 1 to 5.