Distance measuring apparatus
US4527892A · kind A · utility
9Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1982 |
| Grant date | Jul 9, 1985 |
| Priority date | — |
| Expiry date | Dec 1, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C3/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A distance measuring apparatus for automatically measuring the distance from a reference point to a subject of interest, such as a subject to be photographed, is provided. The present apparatus includes a position sensitive detector, a differential circuit and a pair of detecting/extracting circuits each connected between the detector and the differential circuit, whereby each of the detecting/extracting circuits includes electronic switches which change the mode of operation of the apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.