JP2018146993A5

JP2018146993A5 - interchangeable lens

Info

Publication number: JP2018146993A5
Application number: JP2018126622A
Authority: JP
Filing date: 2018-07-03
Publication date: 2018-12-06
Anticipated expiration: 2033-10-09

Claims

A moving lens that moves in a moving direction substantially parallel to the optical axis of the optical system to change the characteristics of the optical system;
A moving lens holding frame for holding the moving lens;
A voice coil fixed relative to the movable lens holding frame,
Three or more arranged apart from each other along the circumferential direction of the moving lens , each extending substantially parallel to the moving direction, and a permanent magnet that generates a driving force when the voice coil is energized ;
A cylindrical member to which the permanent magnet is fixed;
With
An interchangeable lens in which a fixed lens whose relative distance to the moving lens is fixed is fixed to the cylindrical member.

A moving lens that moves in a moving direction substantially parallel to the optical axis of the optical system to change the characteristics of the optical system;
A moving lens holding frame for holding the moving lens;
A voice coil fixed to the moving lens holding frame;
Three or more arranged apart from each other along the circumferential direction of the moving lens, each extending substantially parallel to the moving direction, and a permanent magnet that generates a driving force when the voice coil is energized;
A cylindrical member to which the permanent magnet is fixed;
An outer cylindrical member disposed on the outer peripheral side of the cylindrical member;
With
The outer peripheral side cylindrical member is an interchangeable lens that moves relative to the cylindrical member in the optical axis direction.

In interchangeable lenses that can be attached to and detached from the camera body,
A mount unit coupled to the camera body;
A moving lens that moves in a moving direction substantially parallel to the optical axis of the optical system to change the characteristics of the optical system;
A moving lens holding frame for holding the moving lens;
A voice coil fixed to the moving lens holding frame;
Three or more arranged apart from each other along the circumferential direction of the moving lens, each extending substantially parallel to the moving direction, and a permanent magnet that generates a driving force when the voice coil is energized;
A cylindrical member fixed with the permanent magnet and movable relative to the mount;
Interchangeable lens with

4. The voice coil according to claim 1, wherein the voice coil has a current path that surrounds the moving lens by circling around the optical axis, and generates a magnetic field that acts in common on the permanent magnet. The interchangeable lens according to item 1.

5. The interchangeable lens according to claim 4 , wherein the current path forms a straight line between one of the permanent magnets and another adjacent permanent magnet in a circumferential direction of the moving lens .

The circumferential direction of the movable lens, wherein at least one of the intervals between the permanent magnets, the interchangeable lens according to any one of claims 1 different from the other one to Claim 5.

The circumferential direction of the moving lens, the disposed position away from any permanent magnet, claim 1 further comprising a position sensor for detecting the position along the optical axis of the movable lens holding frame to claim 6 The interchangeable lens as described in any one of.

With respect to the circumferential direction of the moving lens, it extends in a direction substantially parallel to the optical axis at a position away from any of the permanent magnets, fits with the moving lens holding frame, and moves in the moving direction. The interchangeable lens according to any one of claims 1 to 7 , further comprising a main guide shaft that guides the lens holding frame.

Regarding the circumferential direction of the movable lens, the movable lens is held in the same space as the space where the main guide shaft is disposed among the spaces formed between one of the permanent magnets and another adjacent permanent magnet. The interchangeable lens according to claim 8 , further comprising a position sensor that detects a position of the frame in the optical axis direction.

With respect to the circumferential direction of the moving lens, the light is arranged in a space formed between one of the permanent magnets and another permanent magnet adjacent to the space where the main guide shaft is arranged, and the light It extends axially substantially parallel to the direction engaging the movable lens holding frame, in claim 8 or claim 9 further comprising a sub-guide shaft for restricting the rotation with respect to the main guide shaft of the movable lens holding frame The interchangeable lens described.

The interchangeable lens according to any one of claims 8 to 10, wherein the main guide shaft is fixed to the cylindrical member.

The cylindrical member has a substantially cylindrical shape,
The interchangeable lens according to any one of claims 1 to 11, wherein a drive circuit for moving the movable lens holding frame is fixed to at least a part of an outer peripheral surface of the cylindrical member.

The cylindrical member has a substantially cylindrical shape,
The interchangeable lens according to any one of claims 1 to 12, wherein a driving pin for moving the cylindrical member is fixed to at least a part of an outer peripheral surface of the cylindrical member.

Other lenses are fixed so that the cylindrical member is disposed at a position closer to the image plane side than the moving lens holding frame,
The interchangeable lens according to any one of claims 1 to 13, wherein the cylindrical member and the other lens are integrally movable along the optical axis direction.