Molded light pen with lens with water impervious housing

Details Molded light pen with lens with water impervious housing Molded light pen with lens with water impervious housing

1983-09-14

1986-03-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235472, H01J 516

Patent

active

045756279

ABSTRACT:
A fibre optic light pen including a hollow elongate cylindrical housing having a tip portion and a base portion, and having an elongate cylindrical actuator positioned for axial movement relative to and within said housing tip portion is described. The actuator is operable between an extended position at which the actuator point portion projects outwardly from the housing tip portion, and a retracted position at which the actuator point portion is pressed within the housing hollow tip portion. An axial bore extends through the actuator and contains therein a light conductive rod which extends axially along said bore from the actuator's point portion to the actuator's base portion. A fibre optic light conductor is secured within the hollow housing base portion in such a manner that the light conductive rod focuses light on the light conductor when the actuator is recessed within the hollow tip portion of the housing. When the actuator extends from the hollow tip housing portion, the light conductive rod is moved by the actuator away from the fibre optic light conductor such that light is not transmitted to the light conductor from the light conductive rod. The invention also includes a switch that produces a switching signal when the actuator is recessed within the hollow housing.

REFERENCES:
patent: 3749932 (1973-07-01), Jones
patent: 3758782 (1973-09-01), Radford et al.
patent: 3761620 (1973-09-01), Graven
patent: 4039845 (1977-08-01), Oberhansli et al.
patent: 4109146 (1978-08-01), Hillman
patent: 4152075 (1979-05-01), Rellstab et al.
patent: 4490607 (1984-12-01), Pease et al.

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