Pressure actuated light pen

Details Pressure actuated light pen Pressure actuated light pen

1977-04-25

1978-08-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235472, G06K 710

Patent

active

041075404

ABSTRACT:
A pressure actuated light pen attached to the end of an optical fiber bundle has a retractable shutter mechanism at its forward end. The shutter mechanism comprises a plurality of wedge-shaped sections, resiliently urged in a forward direction to at least substantially close off light admittance, and moveable rearwards along inclined paths to produce an aperture at their forward ends, the light pattern at the aperture focussed on the ends of the fibres.

REFERENCES:
patent: 3892974 (1975-07-01), Ellefson et al.
patent: 3911270 (1975-10-01), Traub
patent: 3920959 (1975-11-01), Wefers et al.

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