Automated focusing of a camera module in production
US9516302B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2014 |
| Grant date | Dec 6, 2016 |
| Priority date | — |
| Expiry date | May 18, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/67
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Embodiments of the disclosure permit automated focusing of a camera module during assembly. The camera module can include an imaging device and a lens assembly that is movably mounted to a housing of the camera module. In certain embodiments, the automated focusing can include iteratively imaging a fixed set of reference markings, and successively quantifying the focusing quality of the camera module based at least on a defocus metric defined as a difference between a current spacing and a calibrated spacing among two of the imaged reference markings. The magnitude and sign of the defocus metric can guide, respectively, a magnitude and direction of the movement of the lens assembly relative to the imaging device. After successive adjustments yield a desired focusing quality of the camera module, the lens assembly can be locked in position and can be further processed according to a suitable camera module integration flow.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.