JP2017167511A5

JP2017167511A5 -

Info

Publication number: JP2017167511A5
Application number: JP2016218973A
Authority: JP
Filing date: 2016-11-09
Publication date: 2019-12-19
Anticipated expiration: 2036-11-09

Description

上記目的を達成するために、本発明のレンズ鏡筒は、当該レンズ鏡筒の光軸方向に移動する第１の光学部材と、前記光軸方向に移動する第２の光学部材と、前記第１の光学部材および前記第２の光学部材の各々とカム係合し、光軸に平行なカム軸の周りに回転可能に保持されるカム部材と、前記第１の光学部材を駆動するリニアアクチュエータと、を備え、前記カム部材は、前記カム部材と前記リニアアクチュエータにて光軸方向に移動する前記第１の光学部材とのカム作用により回転し、前記第２の光学部材は、前記カム部材が回転することで、前記第２の光学部材と前記カム部材とのカム作用により光軸方向に移動し、前記カム部材は前記第１の光学部材の外周部に配置されることを特徴とする。 To achieve the above object, a lens barrel of the present invention includes a first optical member which moves in the optical axis direction of the lens barrel, and a second optical member that moves in the optical axis direction, the first respectively and a cam engaging the first optical member and the second optical member, a cam member that will be rotatably held around the parallel cam shaft to the optical axis, the linear actuator to drive said first optical member When, wherein the cam member, the rotated by the cam action between the first optical member that moves in the cam member and the linear actuator in the optical axis direction, the second optical member, the cam member by but rotating, moves in the optical axis direction by the cam action between the cam member and the second optical member, wherein the cam member is characterized Rukoto disposed on an outer peripheral portion of the first optical member .

Claims

A first optical member that moves in the optical axis direction of the lens barrel ;
A second optical member that moves in the optical axis direction;
Wherein respectively the cam engagement of the first optical member and the second optical member, a cam member that will be rotatably held around the parallel cam shaft to the optical axis,
A linear actuator for driving the first optical member,
Said cam member is rotated by the cam action between the first optical member that moves in the optical axis direction by the cam member and the linear actuator,
The second optical member moves in the optical axis direction by a cam action of the second optical member and the cam member as the cam member rotates ,
The lens barrel wherein the cam member is characterized by Rukoto disposed on an outer peripheral portion of the first optical member.

The cam member has a first cam groove in which a cam pin constituting the first optical member is engaged, and a second cam groove in which a cam pin constituting the second optical member is engaged. ,
The lens barrel according to claim 1, wherein the cam inclination angle of the first cam groove is larger than the cam inclination angle of the second cam groove.

A guide bar that guides each of the first optical member and the second optical member in an optical axis direction;
The lens barrel according to claim 1, wherein the cam member , the guide bar, and the linear actuator are arranged in one direction orthogonal to an optical axis.

4. The moving direction of the first optical member with respect to the cam member when the first optical member moves from a wide position to a tele position is only one direction. The lens barrel according to claim 1.

An imaging apparatus comprising the lens barrel according to any one of claims 1 to 4.

The lens barrel according to any one of claims 1 to 4, wherein the cam shaft is arranged at a position opposite to the linear actuator about the optical axis.

A lens barrel that changes a photographing magnification from a wide position to a telephoto position by moving at least a first optical member and a second optical member in an optical axis direction,
A first cam groove with which the first optical member is engaged, and a second cam groove with which the second optical member is engaged on an outer peripheral portion; a cam member rotatable by 120 ° or more ;
A driving device for rotating the cam member,
The first optical member and the second optical member move in the optical axis direction with the rotation of the cam member,
A movement trajectory when the first cam groove is developed with a predetermined diameter is a straight line whose angle with a direction orthogonal to the optical axis is a predetermined inclination angle,
The first cam groove has a groove shape having two surfaces that engage with a cam pin of the first optical member,
The movement trajectory when the second cam groove is developed with a predetermined diameter is non-linear,
The second cam groove has a projection having a surface provided on the side where the first cam groove is provided, and the surface engages with a cam pin of the second optical member,
A lens barrel , wherein a diameter of a portion of the cam member where the first cam groove is formed is different from a diameter of a portion of the cam member where the second cam groove is formed .

The lens barrel according to claim 7, wherein the cam member is disposed on an outer peripheral portion of the first optical member and the second optical member, and has a stepped shaft shape.

8. The wedge-shaped cam groove, wherein one of the first cam groove and the second cam groove has a groove width that increases as the center of rotation of the cam member approaches. Or the lens barrel according to 8.

A first optical member that moves in the optical axis direction of the lens barrel;
A second optical member that moves in the optical axis direction;
A cam member engaged with each of the first optical member and the second optical member and rotatably held around a cam axis parallel to the optical axis;
An actuator for driving the first optical member,
The cam member is rotated by a cam action between the cam member and the first optical member moving in the optical axis direction by the actuator,
The second optical member moves in the optical axis direction by a cam action of the second optical member and the cam member as the cam member rotates,
The cam member includes a first cam engaging member that is formed by itself and engages a second cam engaging member that constitutes the first optical member, and a second cam member that constitutes the second optical member. And a third cam engaging member with which the fourth cam engaging member is engaged.
A lens barrel, wherein a cam inclination angle of the first cam engagement member is larger than a cam inclination angle of the third cam engagement member.

Each of the first cam engaging member and the third cam engaging member includes a cam groove, and each of the second cam engaging member and the fourth cam engaging member includes a cam pin. The lens barrel according to claim 10, wherein:

Changing the photographing magnification from a wide position to a tele position by moving at least the first optical member and the second optical member in the optical axis direction of the lens barrel;
The first cam engaging member has a first cam groove, the third cam engaging member has a second cam groove,
12. The lens barrel according to claim 10, further comprising a drive unit that rotates the cam member.

The first cam groove has a groove shape whose two surfaces engage with the first optical member,
The lens according to claim 12, wherein the second cam groove has a convex portion provided with a surface that engages with the second optical member on a side where the first cam groove is provided. Lens barrel.

14. The lens barrel according to claim 13 , wherein the second cam groove includes a falling-off preventing portion for preventing the second cam groove from being disengaged from the second optical member.

The diameter of a portion of the cam member where the first cam groove is formed and the diameter of a portion of the cam member where the second cam groove is formed are different from each other. The lens barrel according to any one of the above.

The said 1st cam groove and the said 2nd cam groove are formed by one rotation cutting piece, when shaping the said cam member, The one of Claim 12 thru | or 15 characterized by the above-mentioned. Lens barrel.

The said cam member is arrange | positioned at the outer peripheral part of the said 1st optical member and the said 2nd optical member, and is a shaft shape with a level | step difference, The Claims any one of Claims 12 thru | or 16 characterized by the above-mentioned. Lens barrel.

Said first cam groove and one of the cam groove of the second cam groove, claim, characterized in that as the groove width is in the wedge-shaped widened close to the center of rotation of the cam member 12 18. The lens barrel according to any one of claims 17 to 17 .