Title:
APPARATUS FOR CONTROLLING OPERATION OF VOICE COIL MOTOR AND METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2018/004037
Kind Code:
A3
Abstract:
The present invention relates to the control of an operation of a voice coil motor (hereinafter referred to as "VCM") for moving a lens of a camera module and, particularly, to a method for controlling an operation of a VCM, which can reduce noise and shorten a movement time of a lens during the initial operation or landing of the lens. The method comprises the steps of: applying, to a VCM, a current which linearly increases with a first slope to a predetermined first inflection point in response to a camera operation command; and moving a lens to an infinite position by applying, to the VCM, a current which linearly increases with a second slope smaller than the first slope from the inflection point to the infinite position.
Inventors:
LEE SEUNG KWON (KR)
LEE SUN PYO (KR)
LEE HO JUN (KR)
CHO SIN WON (KR)
LEE SUN PYO (KR)
LEE HO JUN (KR)
CHO SIN WON (KR)
Application Number:
PCT/KR2016/007074
Publication Date:
March 08, 2018
Filing Date:
June 30, 2016
Export Citation:
Assignee:
DONGWOON ANATECH CO LTD (KR)
International Classes:
H02P25/02; G02B7/04
Foreign References:
| KR20130124699A | 2013-11-15 | |||
| JP2008178206A | 2008-07-31 | |||
| US20120063019A1 | 2012-03-15 | |||
| JP2012053292A | 2012-03-15 | |||
| JP2013081294A | 2013-05-02 |
Attorney, Agent or Firm:
DARAE IP FIRM (KR)
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