Optical sensor arrangement for tape cassette

Details Optical sensor arrangement for tape cassette Optical sensor arrangement for tape cassette

1990-01-12

1992-06-09

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record medium

In container

360 746, G11B 2302, G11B 1548

Patent

active

051212757

ABSTRACT:
A cassette tape having on both ends thereof a leader and player tape which transmits a greater amount of light than the tape body is wound and contained in a cassette body so that it can travel therein. The cassette body is provided with a detection beam path including a prism, a prism light window, and a transmitting light window. When the leader and player tape has reached the detection beam path, the detection beam is detected by a light receiving portion disposed on a cassette deck by a difference in the amount of transmitted light between the tape body and the leader and player tape, thereby allowing the start and/or end portions of the tape to be detected. The detection beam path includes light-shielding means for preventing extraneous light other than the detection beam from reaching it. This light-shielding means serves to eliminate the effect of the extraneous light on the detection beam receiving portion disposed on the cassette deck, thus contributing to improving the tape end detection accuracy.

REFERENCES:
patent: 4763217 (1988-08-01), Oishi
patent: 4862305 (1989-08-01), Katagiri et al.
patent: 4901171 (1990-02-01), Urayama et al.

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