Shake correction device and imaging apparatus

Patent metadata

Field	Value
Publication number	US-12470823-B2
Application number	US-202418586587-A
Country	US
Kind code	B2
Filing date	Feb 26, 2024
Priority date	Feb 28, 2023
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

A shake correction device according to an aspect of the present invention includes: an imaging element; a fixed unit that includes a magnet member and a yoke member; a movable unit that includes a holding frame holding the imaging element and a coil member, in which the holding frame is supported to be movable within a plane intersecting an optical axis of the imaging element; and a ball that is disposed between the fixed unit and the movable unit, in which the yoke member includes a first yoke to which the magnet member is provided and a second yoke that is disposed to be spaced apart from the first yoke, the first yoke has a first ball receiving surface that is in contact with the ball, and the first ball receiving surface is a partial region of the first yoke and is a protruding portion toward a movable unit side.

First claim

What is claimed is:

1 . A shake correction device comprising:
an imaging element; a fixed unit that includes a magnet member and a yoke member; a movable unit that includes a holding frame holding the imaging element and a coil member, in which the holding frame is supported to be movable within a plane intersecting an optical axis of the imaging element; and a ball that is disposed between the fixed unit and the movable unit, wherein the yoke member includes a first yoke to which the magnet member is provided and a second yoke that is disposed to be spaced apart from the first yoke, the first yoke has a first ball receiving surface that is in contact with the ball, and the first ball receiving surface is a partial region of the first yoke and is a protruding portion toward a movable unit side.

2 . The shake correction device according to claim 1 ,
wherein the first ball receiving surface is a surface formed by machining the protruding portion.

3 . The shake correction device according to claim 1 ,
wherein the protruding portion is a protruding portion formed by press-working a member constituting the first yoke.

4 . The shake correction device according to claim 1 ,
wherein the first yoke is disposed on a subject side with respect to the imaging element, and the movable unit is biased to the first yoke.

5 . The shake correction device according to claim 4 , further comprising:
a biasing member that biases the movable unit to a first yoke side.

6 . The shake correction device according to claim 1 ,
wherein the first yoke is formed of a material having a saturation magnetic flux density of 0.6 T or more and a surface hardness of 290 Hv or more.

7 . The shake correction device according to claim 6 ,
wherein the first yoke is formed of a material having a surface hardness of 350 Hv or more.

8 . The shake correction device according to claim 1 ,
wherein a ball holding portion that holds the ball is formed in the movable unit, and the ball held by the ball holding portion rolls on the first ball receiving surface.

9 . An imaging apparatus comprising:
the shake correction device according to claim 1 ; and an optical system that forms an optical image of a subject on the imaging element, wherein the movable unit corrects an image shake by moving within a plane intersecting an optical axis of the imaging element.

10 . The imaging apparatus according to claim 9 ,
wherein a surface of the first yoke on a subject side is a mounting surface, and the shake correction device is attached to a main body of the imaging apparatus via the mounting surface.

11 . The imaging apparatus according to claim 10 ,
wherein the imaging element and the main body are in contact with each other via the movable unit, a second ball receiving surface formed on the movable unit, the ball, and the first yoke.

12 . The imaging apparatus according to claim 9 ,
wherein the movable unit includes an optical member disposed in a direction from an imaging surface of the imaging element toward the first yoke, and the optical member moves away from a rearmost lens in a case where an external force is applied in a direction opposite to a direction in which the movable unit is biased.

13 . The imaging apparatus according to claim 12 ,
wherein other optical components are not interposed between the optical member and the rearmost lens in a direction of the optical axis.

14 . The imaging apparatus according to claim 9 ,
wherein the imaging apparatus is a lens-integrated imaging apparatus.

Assignees

• Fujifilm Corp

Inventors

• Matsushita Shuhei
• Abe Yuta
• Abe Takuro
• Awazu Kouhei
• Matsushima Atsushi

Classifications

• H04N23/55

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

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title

• H04N23/687 Primary

  by shifting the lens or sensor position · CPC title