Voice coil motor control device and method of driving the same, image pickup device
US7760442B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2005 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Mar 25, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/034
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention provides a control device capable of improving hysteresis characteristics of a voice coil motor (31) and attaining a suitable lens position without complicating the structure of the control device. As solving means of the invention, a voice coil motor control device (30) includes a driving current control part (34) that controls a driving current supplied to the voice coil motor (31) in accordance with a driving pulse subjected to pulse width modulation, and a driving pulse control part (32) that divides a drive period of the voice coil motor (31) into a movement period and a holding period, and controls the driving pulse by changing the duty ratio of the driving pulse during the movement period in accordance with a duty setting value and fixing the duty ratio of the driving pulse during the holding period to the duty setting value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.