Apparatus and method controlling position of camera module with a single coil
US11036026B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2018 |
| Grant date | Jun 15, 2021 |
| Priority date | — |
| Expiry date | Jan 16, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2205/0069
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus controlling a position of a camera module includes an operating coil disposed on a housing of the camera module to face a magnetic member disposed on a lens barrel of the camera module, a driving circuit providing a driving current to the operating coil, a capacitor circuit having a capacitor value to form a resonance circuit together with the operating coil to resonate at a resonance frequency varied depending on an inductance value of the operating coil; a resonance maintaining circuit maintaining a level of a resonance signal generated by the operating coil and the capacitor circuit, a resonance frequency detecting circuit detecting a resonance frequency signal from the resonance signal generated by the operating coil and the capacitor circuit, and a control circuit configured to control the driving circuit in response to the resonance frequency signal from the resonance frequency detecting circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.