Apparatus and method for making a reference exposure on a leading and/or trailing portion of a filmstrip
US5452055A · kind A · utility
12Cited by
12References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1994 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Jul 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/243
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
To locate a reference exposure on a non-perforated leading and/or trailing portion of a filmstrip in conformity with scene exposures associated with respective exposure locating perforations in the filmstrip, a pair of perforation sensors are spaced apart a distance which is the same as the pitch of the exposure locating perforations. When one of the two sensors detects an exposure locating perforation and the other does not, the leading or trailing portion is determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.