Electro-optical rotary coupling suitable for tape scanners

Recorders – Record receiver deforming

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350 9620, 346 33A, 439164, 360 55, 369 4411, G02B 626, G01D 900, H01R 300

Patent

active

049731238

ABSTRACT:
A device for transmission of signals between a stationary element and an element rotating about an axis (8), such as the headwheel (20) of a videotape apparatus, features optical transmission. At least two opto-electrical converters such as photodiodes (9, 10) are provided on one part (6, 7). At least two electro-optical converters such as laser diodes (4, 5) are provided on the other part (1, 34, 42), arranged such that beams (11, 12; 28, 29) generated by the electro-optical converters (4, 5) strike the opto-electrical converters (9, 10) at an acute angle to their axis (8). Preferably, a ring-shaped transparent body (26-31) with a trapezoidal or prism-shaped cross-section surrounds each photodiode and serves to bend the light beam toward the axis (8). Electrical connecting leads (14, 15, 16) which connect the opto-electrical converters (9, 10) to further elements (65) on their part are placed at least partially off the axis (8) of that part (6, 7). Based on the recognition that each magnetic head (65) is generally out of operative relation with the magnetic tape (64) for a portion of each revolution, the optical transmission paths can be harmlessly interrupted (FIG. 4) during said portion (62-63), and thus can be arranged diagonally, rather than axially, as in the prior art. This permits multiple data channels without multiplexing a single axially directed optical transmission.

REFERENCES:
patent: 2935573 (1960-05-01), Haarler et al.
patent: 3588218 (1971-06-01), Hunt
patent: 3823276 (1974-07-01), Maslowski et al.
patent: 4109998 (1978-08-01), Iverson
patent: 4190775 (1980-02-01), Sakurai et al.
patent: 4511934 (1985-04-01), Ohira et al.
patent: 4753506 (1988-06-01), Einhorn et al.

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