Apparatus for initializing a frame counter from a random setting
US4755842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1988 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Jan 6, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Each time an actuator is rotated in engagement with respective teeth of a frame counter in a disposable camera, the counter is rotated the equivalent of one frame to its next setting. To initialize the counter from a random setting during factory prewinding of an unexposed filmstrip onto a take-up spool, the counter includes an elongate rise located between two of its teeth. When the counter is rotated sufficiently in a prewinding direction to locate the elongate rise immediately ahead of the actuator, the counter is initialized. Since the actuator cannot surmount the elongate rise, continued rotation of the actuator in a prewinding direction will not rotate the counter to another setting. Thus as the filmstrip continues to be factory prewound onto the take-up spool the counter remains initialized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.