Actuator and position control apparatus using voice coil motor method with temperature compensation function
US10637375B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 2018 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Sep 28, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/54
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A actuator using a voice coil motor (VCM) method includes a coil configured to face a magnetic member disposed on a lateral surface of a lens carrier, and be spaced apart from the magnetic member, a driving circuit configured to supply a composite current including a driving current and a position detection current to the coil based on a composite voltage input to the driving circuit, and an impedance/digital conversion circuit configured to convert an alternating current (AC) voltage signal including a specific frequency component acquired at opposite ends of the coil via a demodulation scheme, extract a low-frequency signal having an inductance component of the coil, and detect a position signal based on the low-frequency signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.