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Fiberoptic Probe Actuate Switch

IP.com Disclosure Number: IPCOM000077884D
Original Publication Date: 1972-Oct-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Johnson, RB: AUTHOR

Abstract

This assembly provides an actuate switch for an optical-fiber conduit used as a light-sensing probe with an optical display.

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Fiberoptic Probe Actuate Switch

This assembly provides an actuate switch for an optical-fiber conduit used as a light-sensing probe with an optical display.

The assembly comprises a flexible, protective sheath 10 having one end fastened to a wall member 12 of a display. A conventional optical-fiber bundle 14 and vinyl jacket 16 is arranged within the sheath 10, with one end protruding slightly and the other end held in a housing 18 behind the wall member 12. A photosensitive device 20 is arranged in the housing 18 for receiving light from the bundle 14, and for delivering electric current at terminals 21, 22 to an amplifier
23. The housing 18 has a shoulder 24, on which a tongue 26 depends. A cap 28 is arranged about the housing 18 and the tongue 26. with the housing 18 urged forward of a switch 30 by a spring 32.

In operation, the flexible sheath 10 is held in the fingers similar to the way in which a pen is held. When the sheath 10 is urged toward the display (a cathode- ray tube, for example) and the bundle 14 is pressed against the CRT face, the fiber optic-light bundle 14 retracts inside the sheath 10, lifting the housing 18 off the stop and closing the switch 30 across terminals 33, 34. This will permit the light level available in the light bundle 14, as sensed by the photosensitive device 20, to be transmitted to utilization circuitry by way of an AND gating circuit 36.

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