Lens Actuator

Patent metadata

Field	Value
Publication number	US-2016018624-A1
Application number	US-201414771683-A
Country	US
Kind code	A1
Filing date	Mar 14, 2014
Priority date	Mar 14, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

A lens actuator is disclosed. The lens actuator, according to the present invention, comprises: a carrier in which a lens is accommodated, and which has a plurality of first sides; magnets including first magnets respectively arranged on the outer side of the plurality of first sides of the carrier, and second magnets arranged to be spaced from the first magnets; a housing having a plurality of second sides facing the first sides; a plurality of correction coils formed at positions corresponding to the first and second magnets; and a gap-adjusting coil arranged on the lower part of the first magnets.

First claim

What is claimed is:

1 . A lens actuator, the lens actuator comprising:
a carrier accommodating a lens and formed with a plurality of first lateral surfaces; a magnet including a first magnet arranged at an outside of each of the plurality of first lateral surfaces of the carrier, and a second magnet discretely arranged from the first magnet; a housing formed with a plurality of second lateral surfaces opposite to the first lateral surfaces; a plurality of shim coils formed at a position corresponding to that of the first and second magnets; and
a gap adjusting coil arranged at a bottom portion of the first magnet.

2 . The lens actuator of claim 1 , wherein the first lateral surfaces of the carrier are formed with first and second reception grooves to accommodate the first and second magnets.

3 . The lens actuator of claim 1 , wherein a length of the second magnet to an optical axis is longer than that of the first magnet.

4 . The lens actuator of claim 1 , wherein each of the magnets is arranged at a corner portion by being discrete from a center of the first lateral surfaces.

5 . The lens actuator of claim 1 , wherein the gap adjusting coil is formed therein with an opening, and formed along an edge of a bottom surface of the carrier.

6 . The lens actuator of claim 1 , wherein an outside surface of the first and second magnets is formed with a flat surface, and a part of an inner lateral surface includes a slope.

7 . The lens actuator of claim 1 , wherein the second lateral surface is formed with a through hole to expose the shim coil, and the through hole is formed at a periphery thereof with a breakaway prevention unit to prevent the shim coil from breaking away.

8 . The lens actuator of claim 1 , further comprising a leaf spring arranged at an upper surface and a bottom surface of the housing to support an upper surface and a bottom surface of the carrier.

9 . The lens actuator of claim 8 , wherein a coupling protruder coupled to the leaf spring is formed at the upper surface and the bottom surface of the carrier.

10 . The lens actuator of claim 8 , wherein the leaf spring includes an inner leaf spring unit coupled to the carrier, an outer leaf spring unit discretely formed from the inner leaf spring unit to be coupled to the housing, and a connection unit connecting the inner leaf spring unit and the outer leaf spring unit.

11 . The lens actuator of claim 10 , wherein the connection unit includes a straight line-shaped first connection unit connected to the outer leaf spring unit, and a straight line-shaped second connection unit connected to the first connection unit and connected to the inner leaf spring unit.

12 . The lens actuator of claim 1 , further comprising a base unit accommodated by the gap adjusting coil.

13 . The lens actuator of claim 12 , wherein the base unit is formed with an opening formed at an area corresponding to that of the lens and with a ring-shaped groove arranged at a periphery of the opening to accommodate the gap adjusting coil.

14 . The lens actuator of claim 13 , wherein an area corresponding to that of the shim coil on an upper surface of the base unit is formed with an escape groove.

15 . The lens actuator of claim 1 , further comprising a circuit substrate formed with an opening to expose the gap adjusting coil.

16 . The lens actuator of claim 15 , wherein the circuit substrate includes a first terminal electrically connected to the gap adjusting coil and a second terminal electrically connected to the shim coil.

17 . The lens actuator of claim 1 , further comprising a cover can configured to wrap the gap adjusting coil and the shim coil.

Assignees

• Lg Innotek Co Ltd

Inventors

• Yeo In Jae

Classifications

• H04N23/687

  by shifting the lens or sensor position · CPC title

• G02B27/646

  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

• G03B5/00

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title

• G03B2205/0069

  using electromagnetic actuators, e.g. voice coils · CPC title

• G02B7/102 Primary

  controlled by a microcomputer (cameras with interchangeable lenses G03B17/14) · CPC title