Digital control system for automatic-focus cameras
US4314187A · kind A · utility
1Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1980 |
| Grant date | Feb 2, 1982 |
| Priority date | — |
| Expiry date | Jul 3, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A digital control circuit for use in automatic-focus cameras is disclosed, which is suitable for use in self-focusing systems which determine focus by means of triangulation. The system corrects for motor oscillation about a state of proper focus, defocusing caused by inertia, and for an inability to evaluate proper state of focus caused by large distances between the camera and a subject.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.