Title:
AUTO-FOCUSING ADJUSTMENT DEVICE, AND IMAGING DEVICE INCLUDING THE SAME
Document Type and Number:
Japanese Patent JP2015172748
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an auto-focusing adjustment device which has a high-speed auto-focusing function by performing a closed loop control of an applied current, and to provide an imaging system including the same.SOLUTION: An auto-focusing adjustment device 100 includes: an equalizer 30 which generates a control signal for matching a state of a lens 10 to a target value for the state of the lens 10, on the basis of a difference between the target value and an actual measurement value; a PWM modulation unit 40 which generates a PWM signal; an H bridge drive unit 50 which generates a drive current for driving a driving element 12 which changes the state of the lens 10, according to the PWM signal generated by the PWM modulation unit 40; and a closed loop current control unit 60 which uses the PWM signal outputted from the PWM modulation unit 40 to estimate a current applied to the H bridge drive unit 50 and uses the estimated current to control the PWM modulation unit 40 so that the current applied to the H bridge drive unit 50 increases or decreases according to the control signal generated by the equalizer 30.
Inventors:
HA KEUN SOO
Application Number:
JP2015035163A
Publication Date:
October 01, 2015
Filing Date:
February 25, 2015
Export Citation:
Assignee:
SAMSUNG ELECTRO MECH
International Classes:
G02B7/36; G02B7/08; G03B13/36; H04N5/232
Domestic Patent References:
| JP2011039495A | 2011-02-24 | |||
| JP2001128488A | 2001-05-11 |
Attorney, Agent or Firm:
Ippei Watanabe
Hiroyuki Sato
Shigeru Koike
Hiroyuki Sato
Shigeru Koike
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