Automatic focus adjusting apparatus
US5923371A · kind A · utility
11Cited by
10References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1995 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Mar 27, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/672
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An automatic focus adjusting apparatus comprises: a focus detecting circuit for detecting a focusing state and generating a signal according to the focusing state; a speed control circuit to switch a focus adjusting speed to a plurality of stages on the basis of an output of the focus detecting circuit; a depth detecting circuit to detect a depth of field; and a control circuit to change a threshold value of a speed switching point in the speed control circuit on the basis of an output of the depth detecting circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.