Title:
VOICE COIL MOTOR DRIVING CIRCUIT, LENS MODULE USING SAME, AND ELECTRONIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/174853
Kind Code:
A1
Abstract:
When the driving current, reference voltage, and gain of a voice coil motor driving circuit are denoted by IDRV, VREF, and k, respectively, a current detection circuit (10) generates a detection voltage (Vs) given by the equation Vs = VREF + k × IDRV. An error amplifier (20) amplifies the error between a control voltage (VCNT) for specifying the displacement of a VCM (200) and the detection voltage (Vs), thereby generating an error voltage (VERR). A first driver (30) sources or sinks the driving current (IDRV) to or from one end of a coil (L1) in accordance with the error voltage (VERR). A second driver (40) sinks or sources the driving current (IDRV) from or to the other end of the coil (L1) in accordance with the error voltage (VERR). The driving circuit (2) is configured so that the level of the reference voltage (VREF) can be set from the outside.
Inventors:
NINOMIYA TATSUYA (JP)
Application Number:
PCT/JP2014/002340
Publication Date:
October 30, 2014
Filing Date:
April 25, 2014
Export Citation:
Assignee:
ROHM CO LTD (JP)
International Classes:
H02P25/06; G02B7/04; G02B7/08; H02P25/034
Domestic Patent References:
| WO2009150794A1 | 2009-12-17 |
Foreign References:
| JP2003052194A | 2003-02-21 | |||
| JP2011135732A | 2011-07-07 | |||
| JP2012141377A | 2012-07-26 | |||
| JP2008152851A | 2008-07-03 | |||
| US5838515A | 1998-11-17 |
Attorney, Agent or Firm:
MORISHITA, SAKAKI (JP)
Sakaki Morishita (JP)
Sakaki Morishita (JP)
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