Lens driving device, camera device and electronic apparatus

Patent metadata

Field	Value
Publication number	US-12547013-B2
Application number	US-202217703451-A
Country	US
Kind code	B2
Filing date	Mar 24, 2022
Priority date	Apr 14, 2021
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A lens driving device includes a lens holding portion, a driving shaft, a vibration member, and a straight-ahead cam mechanism. The lens holding portion has a holding portion for holding a lens body and is movable in an optical axis direction of the lens body. The driving shaft extends and is supported in a direction orthogonal to the optical axis direction. The vibration member is connected to one end of the driving shaft and causes the driving shaft to micro-vibrate. The straight-ahead cam mechanism is supported by the driving shaft and is movable in an axial direction of the driving shaft. The straight-ahead cam mechanism includes a first sliding surface and the lens holding portion is provided with a second sliding surface. By sliding the first sliding surface with respect to the second sliding surface, force is converted to move the lens holding portion in the optical axis direction.

First claim

What is claimed is:

1 . A lens driving device comprising:
a base having a rear plate and a plurality of column portions rising from the rear plate and a support member fixed to the rear plate; a lens holding portion having a through hole into which a lens body is fitted, the lens body through which light is incident along an optical axis direction and a protrusion portion provided on a lower surface of the lens holding portion, the protrusion portion having a second sliding surface, the lens holding portion is supported so as to be movable in the optical axis direction of the lens body; a driving shaft extending and supported by a column portion of the base and the support member in a direction orthogonal to the optical axis direction; a vibration member comprising a laminated first piezoelectric element, an elastic thin plate, and a second piezoelectric element, the vibration member connected to one end of the driving shaft and causing the driving shaft to micro-vibrate so as to repeat a fine reciprocating movement in an axial direction of the driving shaft orthogonal to the optical axis direction; and a straight-ahead cam mechanism having a spring member accommodated in a groove provided within a rear surface thereof and frictionally engaged with the driving shaft, and a protrusion portion provided with a first sliding surface on an upper side of the groove, the straight-ahead cam mechanism supported by the driving shaft so as to be movable in the axial direction of the driving shaft, wherein by sliding of the first sliding surface with respect to the second sliding surface, a force by which the straight-ahead cam mechanism moves in the axial direction is converted into a force for moving the lens holding portion in the optical axis direction.

2 . The lens driving device according to claim 1 , further comprising a preload portion that applies a preload to the lens holding portion in the optical axis direction.

3 . The lens driving device according to claim 2 , further comprising a guide shaft extending in the optical axis direction, wherein the lens holding portion is provided with a guide hole, and the guide shaft is passed through the guide hole.

4 . The lens driving device according to claim 3 , wherein two guide holes are provided so as to sandwich the second sliding surface therebetween.

5 . The lens driving device according to claim 3 , wherein the preload portion is a coil spring, and the guide shaft penetrates a hollow portion thereof.

6 . The lens driving device according to claim 1 , wherein the first sliding surface formed on an end surface of the protrusion portion of the straight-ahead cam mechanism is a flat surface of which a normal direction is oriented in a direction between the axial direction of the driving shaft and the optical axis direction and the second sliding surface formed on an end surface of the protrusion portion of the lens holding portion is a surface having the same inclination as the first sliding surface.

7 . The lens driving device according to claim 6 , wherein the second sliding surface is a flat surface, and the normal direction of the first sliding surface and a normal direction of the second sliding surface are the same in direction and opposite in orientation.

8 . The lens driving device according to claim 6 , wherein the second sliding surface is a curved surface, and wherein upon sliding the second sliding surface across the first sliding surface, the normal direction of the first sliding surface and a normal direction of the second sliding surface are the same in direction and opposite in orientation.

9 . The lens driving device according to claim 1 , further comprising a support shaft extending in the axial direction, wherein the straight-ahead cam mechanism is provided with a support hole, and the support shaft is passed through the support hole.

10 . The lens driving device according to claim 1 , wherein:
in the straight-ahead cam mechanism, the protrusion portion with the first sliding surface protrudes in the optical axis direction from the upper side of the groove, and in the lens holding portion, the protrusion portion with the second sliding surface protrudes from the lower surface of the lens holding portion.

11 . The lens driving device according to claim 1 , further comprising a pressing portion that presses the lens holding portion toward the axial direction.

12 . The lens driving device according to claim 11 , wherein:
the pressing portion comprises: a magnet provided at the lens holding portion; and
a magnetic material plate provided to face the magnet and applies an attraction force to the magnet,
and
the lens holding portion presses a guide shaft extending in the optical axis direction by the attraction force.

13 . The lens driving device according to claim 12 , wherein two guide shafts are provided, one guide shaft is arranged at a position between the second sliding surface and the pressing portion, and the other guide shaft is arranged at a position along the axial direction on a side opposite to the one guide shaft with the second sliding surface sandwiched therebetween.

14 . The lens driving device according to claim 12 , further comprising a position sensor, wherein the position sensor is positioned between the magnet and the magnetic material plate, and faces the magnet to detect a magnetic field of the magnet.

15 . A camera device comprising the lens driving device of claim 1 .

16 . An electronic apparatus comprising the camera device of claim 15 .

Assignees

• New Shicoh Motor Co Ltd

Inventors

• Onodera Kei
• Naito Kazuhiko

Classifications

• G02B7/02

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

• H02N2/005

  Mechanical details, e.g. housings (casings for dynamo-electric machines H02K5/00) · CPC title

• H02N2/001

  Driving devices, e.g. vibrators · CPC title

• H02N2/04

  Constructional details · CPC title

• G03B13/36

  Autofocus systems · CPC title