Image stabilization apparatus, lens apparatus having image stabilization apparatus, and image pickup apparatus having image stabilization apparatus

Patent metadata

Field	Value
Publication number	US-10324308-B2
Application number	US-201715466997-A
Country	US
Kind code	B2
Filing date	Mar 23, 2017
Priority date	Mar 31, 2016
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

An image stabilization apparatus for a lens apparatus that moves an image stabilizing lens perpendicularly to optical axis includes a fixed barrel, a lens moving frame holding the image stabilizing lens and movable relative to the fixed barrel perpendicularly to the optical axis, an actuator that drives the lens moving frame relative to the fixed barrel, and the encoders used to determine the position of the lens moving frame relative to the fixed barrel. Each encoder includes a scale fixed to either the lens moving frame or the fixed barrel and a detector fixed to the other, the scale is arranged so that its grating is arranged in a radial direction about the optical axis so that the encoder has sensitivity to radial displacement of the lens moving frame about the optical axis which is higher than sensitivity to rotational displacement of the lens moving frame about the optical axis.

First claim

What is claimed is:

1. An image stabilization apparatus, for a lens apparatus, that moves an image stabilizing lens in a moving direction having, as a component thereof, a direction perpendicular to an optical axis of the image stabilizing lens, the image stabilization apparatus comprising:
a fixed lens barrel;
a lens moving frame holding the image stabilizing lens and movable relative to the fixed lens barrel in the moving direction;
an actuator configured to move the lens moving frame in the moving direction; and
an encoder for detecting a position of the lens moving frame in the moving direction,
wherein the encoder includes a scale fixed to one of the lens moving frame and the fixed lens barrel and a detector fixed to the other of the lens moving frame and the fixed lens barrel, and the scale is arranged on the one of the lens moving frame and the fixed lens barrel and on a radial ray with respect to the optical axis such that grating elements of the scale are arranged along the radial ray.

2. The image stabilization apparatus according to claim 1 , wherein the scale is fixed to the lens moving frame and the detector is fixed to the fixed lens barrel.

3. The image stabilization apparatus according to claim 1 , wherein two of the detectors are respectively arranged along two of the radial rays.

4. The image stabilization apparatus according to claim 1 , wherein one of the grating elements has a shape of a circular arc with respect to the optical axis.

5. The image stabilization apparatus according to claim 1 , wherein two of the detectors are respectively arranged at two of the radial rays.

6. A lens apparatus comprising:
an image stabilizing lens; and
an image stabilization apparatus that moves the image stabilizing lens in a moving direction having, as a component thereof, a direction perpendicular to an optical axis of the image stabilizing lens, the image stabilization apparatus comprising:
a fixed lens barrel;
a lens moving frame holding the image stabilizing lens and movable relative to the fixed lens barrel in the moving direction;
an actuator configured to move the lens moving frame in the moving direction; and
an encoder for detecting a position of the lens moving frame in the moving direction,
wherein the encoder includes a scale fixed to one of the lens moving frame and the fixed lens barrel and a detector fixed to the other of the lens moving frame and the fixed lens barrel, and the scale is arranged on the one of the lens moving frame and the fixed lens barrel and on a radial ray with respect to the optical axis such that grating elements of the scale are arranged along the radial ray.

7. An image pickup apparatus comprising:
a lens apparatus; and
an image pickup element configured to receive an image formed by the lens apparatus,
wherein the lens apparatus comprises:
an image stabilizing lens; and
an image stabilization apparatus that moves the image stabilizing lens in a moving direction having, as a component thereof, a direction perpendicular to an optical axis of the image stabilizing lens, the image stabilization apparatus comprising:
a fixed lens barrel;
a lens moving frame holding the image stabilizing lens and movable relative to the fixed lens barrel in the moving direction;
an actuator configured to move the lens moving frame in the moving direction; and
an encoder for detecting a position of the lens moving frame in the moving direction,
wherein the encoder includes a scale fixed to one of the lens moving frame and the fixed lens barrel and a detector fixed to the other of the lens moving frame and the fixed lens barrel, and the scale is arranged on the one of the lens moving frame and the fixed lens barrel and on a radial ray with respect to the optical axis such that grating elements of the scale are arranged along the radial ray.

Assignees

• Canon Kk

Inventors

• Isaka Mitsuhiro

Classifications

• G03B17/12

  with means for supporting objectives, supplementary lenses, filters, masks, or turrets · CPC title

• G03B2205/0015

  by displacing one or more optical elements normal to the optical axis · CPC title

• G02B27/646 Primary

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · CPC title

• H04N23/687

  by shifting the lens or sensor position · CPC title

• H04N5/23287

  Electricity · mapped topic