Mark detection apparatus for a micro-roll film
US4607950A · kind A · utility
11Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1985 |
| Grant date | Aug 26, 1986 |
| Priority date | — |
| Expiry date | Apr 25, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/113
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A mark detecting apparatus for a micro-roll film including one photoelectric element for detecting marks of different sizes provided on one edge portion of a micro-roll film for respective frames of the film, a pulse generating unit which generates pulses by radial slits formed in a disc adapted to be driven for rotation by contacting the micro-roll film, and a mark size judging circuit which counts the pulses produced from the pulse generating unit during the photoelectric element for the mark is detecting the mark of the film for judging the size of the mark by the counted value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.