The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 1990
Filed:
Aug. 29, 1989
Jorn Lutzeler, Zwingenberg, DE;
BTS Broadcast Television Systems GmbH, Darmstadt, DE;
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.