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Browse Prior Art Database

Differential Optical Sensor

IP.com Disclosure Number: IPCOM000052632D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Buchholz, MH: AUTHOR

Abstract

The tape tension transducer, shown in the figure, functions to provide differential control signal to a servo system which regulates the tension on tape being transferred between reels of a reel-to-reel magnetic tape transport.

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Differential Optical Sensor

The tape tension transducer, shown in the figure, functions to provide differential control signal to a servo system which regulates the tension on tape being transferred between reels of a reel-to-reel magnetic tape transport.

Differential control signals are provided by the differential optical sensor 11 which comprises a sensor mounting 12, a pair of optical emitters 13A and 13B, and a pair of optical sensors 14A and 14B. Tension arm 15 is pivotally mounted at point 17 and is provided with a roller 18 at the distal end 19 of arm 15. The transducer is positioned in the tape path of a tape transport such that tape 20 is in a substantially 180Degrees wrap relationship to roller 18. Variation in tape tension results in arm 15 pivoting about point 17 which moves a flag member 22 relative to each emitter-sensor pair. Differential signals are, therefore, provided at the output of the sensors as a result of one sensor seeing more energy and the other sensor seeing less energy when the movement of flag 22 results from a change in tape tension. The signals are related to the amount of area 1 and area 2 covered by flag members 22. The differential control signals can then regulate the servo system to return the tension to some predetermined optimum condition.

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