Photographic reprint system with dual indicia sensor for synchronization recovery
US4264197A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1980 |
| Grant date | Apr 28, 1981 |
| Priority date | — |
| Expiry date | Jan 4, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/80
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic reprint system includes a preparation station at which film segments or strips are attached to an elongated tab. Indicia (typically in the form of holes) are formed in the tab to indicate the location of each film frame, to signify the end of the film segment, the end of a customer order, and the end of a reel. Information relating to the printing of each film frame, including the number of holes in the tab adjacent that frame, is stored in a storage medium such as a floppy disk. At a photographic printer, the tab and attached film segments are advanced sequentially to a print gate, where printing occurs based upon the data which is sequentially retrieved from the storage medium. A first hole sensor located upstream of the print gate counts the number of holes in the tab as each frame is advanced to the print gate, and this number is compared with the stored number which has been retrieved from the storage medium. Even if the numbers disagree, however, the film frame is still printed, but the number of holes is also counted by a second hole sensor adjacent the print gate. If the number of holes sensed by the second sensor also disagrees with the stored number, furthe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.