OPTICAL IMAGE STABLILIZER

• US 20130163085A1
• Filed: 08/13/2012
• Published: 06/27/2013
• Est. Priority Date: 12/22/2011
• Status: Active Grant

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Lim, Soo Cheol, Kang, Byung Woo, On, Sang Min
• Granted Patent: US 9,134,587 B2
• Time in Patent Office: Days
• US Class Current: 359/557
• CPC Class Codes: G01D 5/142 using Hall-effect devices measuring magnetic variables using Hall-effect or other galvanomagnetic devices G01R33/06
• CPC Class Codes: G02B 27/646 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 Class Codes: G02B 7/08 adapted to co-operate with a remote control mechanism
• CPC Class Codes: G03B 2205/0015 by displacing one or more optical elements normal to the optical axis
• CPC Class Codes: G03B 2205/0053 Driving means for the movement of one or more optical element
• CPC Class Codes: G03B 3/10 Power-operated focusing
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing
• CPC Class Codes: H01F 7/0205 Magnetic circuits with PM in general
• CPC Class Codes: H02K 41/0356 moving along a straight path

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.

Claims

1. An optical image stabilizer comprising:

a drive unit including a magnet 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 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.