Tape end detecting device for tape decks using center and side prisms for directing light
US5311030A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1992 |
| Grant date | May 10, 1994 |
| Priority date | — |
| Expiry date | Sep 2, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tape end detecting device for detecting the end of the tape enclosed within a cassette includes a light emitting element for generating a light pulse signal, a pair of light receiving element, a light guide means comprising a central prism and a pair of side prisms disposed at both sides of said cassette loaded in position, and a tape end signal generating circuit adopted for generating a tape end detecting signal only when it receives the light pulse signal. Therefore, the tape end detecting device operates to generate an output upon receipt of the light signal, but does not generate when the light coming from outside is received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.