Tape cassette drive
US4057839A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1975 |
| Grant date | Nov 8, 1977 |
| Priority date | — |
| Expiry date | Dec 22, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/675
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A drive for a magnetic tape cassette. Edge and corner blocks mounted on a planar frame receive the leading edge of a magnetic tape cassette adjacent the corners thereof and position the cassette with respect to drive spindles which engage tape reels in the cassette and to a transducer located with respect to the blocks. The cassette has a notch offset from the center in the railing edge thereof. In one of two operating positions of the cassette, the notch registers with a switch, so the switch is not actuated. In the other position, the bottom surface of the cassette actuates the switch. A second switch registers with a selectively plugged recess in the trailing edge of the cassette thereby to enable or disable writing operations. A light source, disposed in the frame, transmits light along a first axis toward a detector housing. A prism in the housing intercepts and redirects the light toward a photosensitive detector. The tape interrupts the light beam except when an aperture in the tape passes the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.