Camera with an automatic focusing device
US4367934A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1981 |
| Grant date | Jan 11, 1983 |
| Priority date | — |
| Expiry date | Jul 22, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/40
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A distance detecting device for close-up photography applicable to a range finding device of the type wherein light emitted from a light source is projected onto an object through a projecting lens, and the light reflected from the object impinges upon one of a plurality of light receiving elements via a light receiving lens for detecting which one of a plurality of zones the object is located, depending on which one of the light receiving elements receives the light. The device in accordance with the present invention generates a single light pulse for ordinary photography and light pulses successively for close-up photography, indicating whether a camera-to-target-object distance matches a predetermined distance for close-up photography or deviates therefrom. The successive light pulses for close-up photography may be weaker in intensity than the single light pulse for ordinary photography.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.