- Patent Title: Apparatus and method for controlling auto focus of camera module
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Application No.: US15455018Application Date: 2017-03-09
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Publication No.: US09883098B2Publication Date: 2018-01-30
- Inventor: Haejin Park , Sungdu Kwon , Youngman Kwon , Jayong Lee , Taegil Cho , Salkmann Ji , Samnyol Hong
- Applicant: LG ELECTRONICS INC.
- Applicant Address: KR Seoul
- Assignee: LG ELECTRONICS INC.
- Current Assignee: LG ELECTRONICS INC.
- Current Assignee Address: KR Seoul
- Agency: Lee Hong Degerman Kang & Waimey
- Priority: KR10-2016-0028174 20160309; KR10-2016-0117824 20160913
- Main IPC: H04N5/228
- IPC: H04N5/228 ; G03B13/34 ; H04N5/232 ; G02B7/28 ; H02P7/025 ; H02P29/64 ; G05D3/14

Abstract:
Disclosed are an apparatus and method for controlling auto focus of a camera module. The present invention includes a lens unit, a moving coil, a fixed coil, and a controller configured to provide a signal comprising first frequency signal and second frequency signal to the moving coil, the fixed coil receiving the variable current or the variable voltage through the second frequency signal, calculate a focus position value based on the received variable current or the variable voltage and an image signal, and control the lens unit to move by applying the first frequency signal to the moving coil according to the calculated focus position value, wherein the controller is further configured to detect a temperature change of the fixed coil and to correct a focus position of the lens unit corresponding to the detected temperature change of the fixed coil.
Public/Granted literature
- US20170264813A1 APPARATUS AND METHOD FOR CONTROLLING AUTO FOCUS OF CAMERA MODULE Public/Granted day:2017-09-14
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