Film canister to facilitate diameter sensing
US5153625A · kind A · utility
15Cited by
10References
34Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1990 |
| Grant date | Oct 6, 1992 |
| Priority date | — |
| Expiry date | Mar 29, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B1/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film canister with non-contacting means for indicating and facilitating sensing and calculation of film roll diameter and length of film left in the canister, and providing indication of film-out. The system for sensing the roll diameter comprises the canister, an inductive sensor and metered feed rollers. The system for calculating the film diameter and length and determining film-out comprises a microprocessor with visual indicating means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.