Lens drive device

Patent metadata

Field	Value
Publication number	US-10409085-B2
Application number	US-201715659100-A
Country	US
Kind code	B2
Filing date	Jul 25, 2017
Priority date	Jul 29, 2016
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

An X-axis movable object holding portion to hold an X-axis movable object is provided at a position facing an X-axis actuator in a base member. A Y-axis movable object holding portion to hold a Y-axis movable object is provided at a position facing a Y-axis actuator in the X-axis movable object. An X-axis stopper mechanism for restricting a movement range of the X-axis movable object is provided in the base member. A Y-axis stopper mechanism for restricting a movement range of the Y-axis movable object is provided in the X-axis movable object.

First claim

What is claimed is:

1. A lens drive device for driving a lens, comprising:
a base member;
an X-axis actuator configured to be provided in the base member and have an X-axis piezoelectric element expanding and contracting in an X-axis direction orthogonal to a direction of an optical axis of the lens when the lens is being driven by the lens drive device and an X-axis drive shaft fixed on one end portion of the X-axis direction in the X-axis piezoelectric element;
an X-axis movable object configured to be disposed to overlap the base member in the direction of the optical axis of the lens when the lens is being driven by the lens drive device and have an X-axis friction engagement portion frictionally engaging with outer circumference of the X-axis drive shaft;
an X-axis movable object holding portion configured to be provided at a position facing the X-axis actuator with the optical axis of the lens between the X-axis movable object holding portion and the X-axis actuator in the base member when the lens is being driven by the lens drive device and hold the X-axis movable object to be movable in the X-axis direction with respect to the base member;
a Y-axis actuator configured to be provided in the X-axis movable object and have a Y-axis piezoelectric element expanding and contracting in a Y-axis direction orthogonal to the direction of the optical axis of the lens when the lens is being driven by the lens drive device and crossing the X-axis direction and a Y-axis drive shaft fixed on one end portion of the Y-axis direction in the Y-axis piezoelectric element;
a Y-axis movable object configured to be disposed to overlap the X-axis movable object at the side opposite to the side provided with the base member in the direction of the optical axis of the lens when the lens is being driven by the lens drive device and have a Y-axis friction engagement portion frictionally engaging with outer circumference of the Y-axis drive shaft;
a Y-axis movable object holding portion configured to be provided at a position facing the Y-axis actuator with the optical axis of the lens between the Y-axis movable object holding portion and the Y-axis actuator in the X-axis movable object when the lens is being driven by the lens drive device and hold the Y-axis movable object to be movable in the Y-axis direction with respect to the X-axis movable object; and
a lens carrier configured to be disposed to overlap the Y-axis movable object at the side opposite to the side provided with the X-axis movable object in the direction of the optical axis of the lens when the lens is being driven by the lens drive device and have a lens attachment portion to attach the lens;
wherein:
an X-axis stopper mechanism for restricting a movement range of the X-axis direction in the X-axis movable object is provided in the base member;
a Y-axis stopper mechanism for restricting a movement range of the Y-axis direction in the Y-axis movable object is provided in the X-axis movable object;
the base member has a base body portion, a first convex portion provided on a surface of the base body portion at the side of the X-axis movable object, and a second convex portion provided on the surface of the base body portion at the side of the X-axis movable object in a state in which a predetermined gap is provided in the X-axis direction between the first convex portion and the second convex portion of the base member;
the X-axis stopper mechanism is configured using the first convex portion and the second convex portion of the base member;
the X-axis friction engagement portion is located between the first convex portion and the second convex portion of the base member; and
a length of the X-axis direction in the X-axis friction engagement portion is shorter than a length of the predetermined gap between the first convex portion and the second convex portion of the base member.

2. The lens drive device according to claim 1 , wherein
the first convex portion and the second convex portion of the base member hold the X-axis drive shaft to be movable in the X-axis direction.

3. A lens drive device for driving a lens, comprising:
a base member;
an X-axis actuator configured to be provided in the base member and have an X-axis piezoelectric element expanding and contracting in an X-axis direction orthogonal to a direction of an optical axis of the lens when the lens is being driven by the lens drive device and an X-axis drive shaft fixed on one end portion of the X-axis direction in the X-axis piezoelectric element;
an X-axis movable object configured to be disposed to overlap the base member in the direction of the optical axis of the lens when the lens is being driven by the lens drive device and have an X-axis friction engagement portion frictionally engaging with outer circumference of the X-axis drive shaft;
an X-axis movable object holding portion configured to be provided at a position facing the X-axis actuator with the optical axis of the lens between the X-axis movable object holding portion and the X-axis actuator in the base member when the lens is being driven by the lens drive device and hold the X-axis movable object to be movable in the X-axis direction with respect to the base member;
a Y-axis actuator configured to be provided in the X-axis movable object and have a Y-axis piezoelectric element expanding and contracting in a Y-axis direction orthogonal to the direction of the optical axis of the lens when the lens is being driven by the lens drive device and crossing the X-axis direction and a Y-axis drive shaft fixed on one end portion of the Y-axis direction in the Y-axis piezoelectric element;
a Y-axis movable object configured to be disposed to overlap the X-axis movable object at the side opposite to the side provided with the base member in the direction of the optical axis of the lens when the lens is being driven by the lens drive device and have a Y-axis friction engagement portion frictionally engaging with outer circumference of the Y-axis drive shaft;
a Y-axis movable object holding portion configured to be provided at a position facing the Y-axis actuator with the optical axis of the lens between the Y-axis movable object holding portion and the Y-axis actuator in the X-axis movable object when the lens is being driven by the lens drive device and hold the Y-axis movable object to be movable in the Y-axis direction with respect to the X-axis movable object;
a lens carrier configured to be disposed to overlap the Y-axis movable object at the side opposite to the side provided with the X-axis movable object in the direction of the optical axis of the lens when the lens is being driven by the lens drive device and have a lens attachment portion to attach the lens;
wherein:
an X-axis stopper mechanism for restricting a movement range of the X-axis direction in the X-axis movable object is provided in the base member;
a Y-axis stopper mechanism for restricting a movement range of the Y-axis direction in the Y-axis movable object is provided in the X-axis movable object;
the X-axis movable object further has an X-axis movable object body portion provided with the X-axis friction engagement portion, a first convex portion provided on a surface of the X-axis movable object body portion at the side of the Y-axis movable object, and a second convex portion provided on the surface of the X-axis movable object body portion at the side of the Y-axis movable object in a state in which a predetermined gap is provided in the Y-axis direction between the first convex portion and the second convex portion of the X-axis movable object;
the Y-axis stopper mechanism is configured using the first convex portion and the second convex portion of the X-axis movable object;
the Y-axis friction engagement portion is located between the first convex portion and the second convex portion

Assignees

• Tdk Corp

Inventors

• Hosokawa Masahiro
• Horii Takuto
• Yusa Naoki

Classifications

• H02N2/025

  Inertial sliding motors · CPC title

• H02N2/028

  along multiple or arbitrary translation directions, e.g. XYZ stages · CPC title

• G03B5/02

  Lateral adjustment of lens · 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

• H02N2/043

  Mechanical transmission means, e.g. for stroke amplification · CPC title