Pressure actuated light pen

Details Pressure actuated light pen Pressure actuated light pen

1977-04-25

1978-08-22

Dahl, Lawrence J.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235472, 350 9618, G02B 514

Patent

active

041091469

ABSTRACT:
A pressure actuated light pen attached to the end of an optical fibre bundle has a retractable tip in which is formed an aperture. No image is focussed onto the ends of the fibres until the tip, with the aperture, is retracted to a predetermined position. At this position, the aperture is effectively focussed onto the ends of the fibres, to give an image of sufficient brightness for detection, and processing, by associated circuitry.

REFERENCES:
patent: 3749932 (1973-07-01), Jones
patent: 3947088 (1976-03-01), French

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