Offset spectra lens system for a two spectra automatic focusing system
US5973846A · kind A · utility
19Cited by
12References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1998 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Nov 30, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/285
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved auto-focus system for a digital camera has a lens designed to have the focus of two spectra offset from each other by a predetermined amount. The two offset spectra are used to calculate two focus signals. Once the two focus signals are calculated the correct direction to move the lens system to set the optimum focus can be determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.