Auto-focusing camera
US7764878B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2007 |
| Grant date | Jul 27, 2010 |
| Priority date | — |
| Expiry date | Aug 26, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B13/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An auto-focusing camera includes a pair of drive units (100, 200) arranged back-to-back. Each one of the drive units includes a lens unit (11), a permanent magnet (12) mounted around the lens unit, upper and lower coil seats (15a, 15b) arranged at upper and lower sides of the permanent magnet, and upper and lower coils (14a, 14b) wound around the upper and lower coil seats, respectively. The upper and lower coils are used for inducing the upper and lower yokes (10c, 10d) to generate magnetic fields when electric currents are applied to the first and second coils. The magnetic fields generated by the upper and lower yokes interact with the magnetic field of the permanent magnet to drive the lens unit into movement between its focal points. The permanent magnet is fixed to and telescopes inwardly or outwardly with the lens unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.