Correction optical device and imaging device

Patent metadata

Field	Value
Publication number	US-10165187-B2
Application number	US-201715765278-A
Country	US
Kind code	B2
Filing date	Mar 8, 2017
Priority date	Mar 10, 2016
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A correction optical device comprises an OIS frame, and an OIS lock ring that restricts a movement of the OIS frame. The OIS lock ring rotates so that a position of a first protrusion reciprocates between a lock position and an unlock position. The first protrusion and the second protrusion are formed into such shapes that generate a component force acting on the first protrusion in a direction from the unlock position toward the lock position when a force causing the first protrusion and the second protrusion to push against each other is generated between the first protrusion and the second protrusion.

First claim

The invention claimed is:

1. A correction optical device for correcting an image blur, comprising:
a movable member that moves along a plane perpendicular to an optical axis of the correction optical device to change a relative positional relation between a lens and an image sensor which receives light through the lens; and
a restriction member that is disposed rotatably about an axis parallel to the optical axis to restrict a movement of the movable member,
wherein the restriction member rotates so that a first protrusion formed on the restriction member reciprocates between a restricting position and a releasing position;
wherein, when the first protrusion is in the restricting position, the first protrusion and a second protrusion formed on the movable member oppose to each other to restrict a movement of the movable member along an opposing direction in which the first and second protrusions oppose to each other; and
wherein, when the first protrusion is in the releasing position, the first protrusion and the second protrusion do not oppose to each other to release restriction of the movement of the movable member along the opposing direction, and
wherein the first protrusion and the second protrusion are formed into such shapes that generate a component force acting on the first protrusion in a direction from the releasing position toward the restricting position when a force causing the first protrusion and the second protrusion to push against each other along the opposing direction is generated between the first protrusion and the second protrusion.

2. The correction optical device according to claim 1 , wherein shapes of the first and second protrusions viewed from a direction of the optical axis are such that a tangent line to the first and second protrusions at a contact point at which the first protrusion is in contact with the second protrusion when the first protrusion is in the restricting position is inclined relative to a straight line which is perpendicular to a straight line connecting the contact point and a rotational center of the restriction member so that the tangent line is closer on a side of the releasing position to the rotational center than on a side of the restricting position.

3. The correction optical device according to claim 2 , wherein a contour of each of the first and second protrusions passing through the contact point viewed from the direction of the optical axis is an arc.

4. The correction optical device according to claim 3 , wherein a radius of the arc of the first protrusion is larger than a radius of the arc of the second protrusion.

5. The correction optical device according to claim 1 , wherein the movable member holds the lens, and moves in a state of holding the lens.

6. The correction optical device according to claim 5 , wherein the restriction member has a ring portion having an approximately annular shape, and a plurality of the first protrusions that are protruding outward from a periphery of the ring portion,
wherein the movable member has a frame portion having an approximately annular shape and holding the lens at a center of the ring portion, and a plurality of the second protrusions that are protruding from the frame portion in a direction of the optical axis, and
wherein the restriction member is disposed relative to the movable member so that the lens is exposed from a hollow of the ring portion and that the plurality of the second protrusions surround the restriction member.

7. The correction optical device according to claim 6 , further comprising:
a holding member that holds the movable member; and;
a plurality of balls disposed between the movable member and the holding member,
wherein each of the plurality of the second protrusions is connected to the holding member through an elastic member.

8. The correction optical device according to claim 1 , wherein at least three first protrusions each being the first protrusion are formed on the restriction member,
wherein at least three second protrusions each being the second protrusion are formed on the movable member, and
wherein, when the first protrusions are each in the restricting position, the first protrusions and the second protrusions oppose to each other at three or more positions.

9. The correction optical device according to claim 1 , wherein the movable member holds the image sensor, and moves in a state of holding the image sensor.

10. An imaging apparatus comprising the correction optical device according to claim 1 .

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kadowaki Keita

Classifications

• H04N23/687 Primary

  by shifting the lens or sensor position · CPC title

• G03B5/02 Primary

  Lateral adjustment of lens · CPC title

• H04N23/50

  Constructional details · CPC title

• H04N23/60

  Control of cameras or camera modules · CPC title

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title