Optical unit with shake correction function

Patent metadata

Field	Value
Publication number	US-11656477-B2
Application number	US-202117352347-A
Country	US
Kind code	B2
Filing date	Jun 20, 2021
Priority date	Jun 22, 2020
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

An optical unit with a shake correction function includes a movable body having an optical element, a swing support mechanism swingably supporting the movable body, a fixed body supporting the movable body through the swing support mechanism, and a magnetic drive mechanism structured to swing the movable body. The magnetic drive mechanism includes a coil fixed to one of the movable body and the fixed body, and a magnet fixed to the other of the movable body and the fixed body. The swing support mechanism includes a first plate spring connecting an end part of the movable body on one side in an optical axis direction with the fixed body, and a second plate spring connecting the other end part of the movable body in the optical axis direction with the fixed body. The magnet and the coil are disposed between the first plate spring and the second plate spring.

First claim

What is claimed is:

1. An optical unit with a shake correction function, comprising:
a movable body comprising an optical element;
a swing support mechanism which swingably supports the movable body;
a fixed body which comprises a case surrounding an outer peripheral side of the movable body and supports the movable body through the swing support mechanism; and
a magnetic drive mechanism structured to swing the movable body;
wherein the magnetic drive mechanism comprises:
a first magnetic drive mechanism structured to swing the movable body around a first swing axis intersecting an optical axis of the optical element; and
a second magnetic drive mechanism structured to swing the movable body around a second swing axis which intersects the optical axis and intersects the first swing axis; and
wherein each of the first magnetic drive mechanism and the second magnetic drive mechanism comprises:
a coil, fixed to one of the movable body and the case; and
a magnet, fixed to an other of the movable body and the case;

wherein the magnet and the coil face each other in a direction intersecting the optical axis of the optical element;
wherein the swing support mechanism comprises:
a first plate spring which connects an end part of the movable body on one side in a direction of the optical axis with the case; and
a second plate spring which connects an end part of the movable body on an other side in the direction of the optical axis with the case; and

wherein each of the first plate spring and the second plate spring comprises:
a movable body side connecting part connected with the movable body;
a fixed body side connection part connected with the case; and
an arm part which connects the movable body side connecting part with the fixed body side connection part;

wherein the magnet and the coil of each of the first magnetic drive mechanism and the second magnetic drive mechanism are disposed between the first plate spring and the second plate spring when viewed in a direction intersecting the optical axis; and
wherein, when viewed in a direction of the optical axis, the fixed body side connection parts and the arm parts of the first plate spring and the second plate spring are disposed between the magnet and the coil facing each other of the first magnetic drive mechanism and the magnet and the coil facing each other of the second magnetic drive mechanism.

2. The optical unit with a shake correction function according to claim 1 , wherein
a swing center of the movable body is located between the first plate spring and the second plate spring, when viewed in a direction perpendicular to the optical axis.

3. The optical unit with a shake correction function according to claim 1 , wherein
the arm part is extended in a plane intersecting the optical axis.

4. The optical unit with a shake correction function according to claim 1 , wherein
the arm part of the first plate spring is inclined in a direction toward the one side in the direction of the optical axis as going from the movable body side connecting part to the fixed body side connection part, and
the arm part of the second plate spring is inclined in a direction toward the other side in the direction of the optical axis as going from the movable body side connecting part to the fixed body side connection part.

5. The optical unit with a shake correction function according to claim 4 , wherein
the first plate spring and the second plate spring are formed in a same shape, and
the first plate spring and the second plate spring are reversely disposed in the direction of the optical axis.

Assignees

• Nidec Sankyo Corp

Inventors

• Sue Takeshi
• Minamisawa Shinji
• Arai Tsutomu

Classifications

• G02B7/02

  for lenses {(supports for magnifying lenses G02B25/002)} · CPC title

• G03B2205/0007

  Movement of one or more optical elements for control of motion blur · CPC title

• G03B2205/0069

  using electromagnetic actuators, e.g. voice coils · 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

• G03B5/06

  Swinging lens about normal to the optical axis · CPC title