Optical system for magnetic tape end detection
US4862305A · kind A · utility
14Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1987 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Jun 29, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/08721
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic tape cassette having a locking member locking the tape reels and a prism for transmitting light reflected therein across a tape transport path to detect the end of the tape. The prism receives and transmits the light through two holes in the cassette case. A projection on the locking member moves between the holes when the reels are unlocked to block light spuriously reflected from the incident surface of the prism from being detected as light transmitted through the prism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.