Optical image stabilizer detecting x direction displacement and y direction displacement of lens group

Patent metadata

Field	Value
Publication number	US-2016004091-A1
Application number	US-201514853620-A
Country	US
Kind code	A1
Filing date	Sep 14, 2015
Priority date	Dec 22, 2011
Publication date	Jan 7, 2016
Grant date	—

Abstract

An optical image stabilizer, in which a magnet and a coil are arranges such that they oppose each other. The Hall sensor is arranged such that one face thereof is opposed to one face of the magnet. The Hall sensor can easily detect the location of a group of lenses by generating a corresponding signal in response to a variation in magnetic force following a variation in the gap between magnets depending on the direction in which a group of lenses is driven, and simultaneously, in response to a variation in magnetic force that occurs when the group of lenses is displaced in the direction that intersects the direction of the gap.

First claim

What is claimed is:

1 . An optical image stabilizer comprising:
a drive unit including a magnet used for the optical image stabilizer and a coil, the magnet being disposed along an optical axis of a camera module; and a Hall sensor, a face of the Hall sensor being opposed to a face of the magnet.

2 . The optical image stabilizer of claim 1 , wherein the Hall sensor is smaller than the thickness of the coil.

3 . The optical image stabilizer of claim 1 , wherein the Hall sensor is disposed inside or outside the coil.

4 . The optical image stabilizer of claim 3 , wherein the Hall sensor is disposed between an S pole and an N pole of the magnet.

5 . An optical image stabilizer comprising:
a magnet used for the optical image stabilizer provided in an auto-focusing unit, which includes an autofocus device so that a lens barrel is linearly movable, the magnet being disposed along an optical axis; a coil provided in a housing, which is provided inside the auto-focusing unit, the coil being opposed to the magnet; and a Hall sensor provided in the housing, a face of the Hall sensor being opposed to a face of the magnet.

6 . The optical image stabilizer of claim 5 , comprising a plurality of the coils, wherein the coils are arranged about the lens barrel such that the coils intersect each other.

7 . The optical image stabilizer of claim 6 , comprising a plurality of the coils, the Hall sensor being provided in at least two of the coils.

8 . The optical image stabilizer of claim 7 , wherein the Hall sensor is arranged inside or outside the coil.

9 . The optical image stabilizer of claim 8 , wherein the Hall sensor is smaller than the thickness of the coil.

10 . The optical image stabilizer of claim 7 , wherein the Hall sensor is disposed between an S pole and an N pole of the magnet.

Assignees

• Samsung Electro Mech

Inventors

• Lim Soo Cheol
• Kang Byung Woo
• Oh Sang Min

Classifications

• H01F7/0205

  Magnetic circuits with PM in general · CPC title

• G03B5/00

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

• G01D5/142

  using Hall-effect devices (measuring magnetic variables using Hall-effect or other galvanomagnetic devices G01R33/06) · 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

• G03B3/10 Primary

  Power-operated focusing · CPC title