Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1974-10-04
1976-01-06
Lawrence, James W.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
235 6111E, 250568, G06K 710
Patent
active
039315240
ABSTRACT:
There is disclosed apparatus for scanning a concave coded record which is adapted to be disposed in the inside of an open-ended tube. A rotor carries a source of illumination which illuminates the record. Light reflected from the record is reflected onto a mirror carried by the rotor and passes along the axis of rotation of the rotor through a suitable lens or lenses and is focused on a mask. The mask has an aperture through which light passes to a light receptor such as a photodetector. The light receptor is stationarily mounted to the frame. The frame also mounts a motor for driving the rotor and bearings for rotatably mounting the rotor. A cover adapted to abut the end of the tube is mounted for movement between one position in which the cover is in the reflected light path and another position in which the cover is out of the reflected light path. A spring normally urges the cover into the one position but when the cover is moved into contact with the end of the tube the cover is moved to the other position at which the light receptor can receive light reflected from the coded record.
REFERENCES:
patent: 3413447 (1968-11-01), Lamers
patent: 3474234 (1969-10-01), Rieger
patent: 3735142 (1973-05-01), Harr
Grass Joseph J.
Lawrence James W.
Monarch Marking Systems, Inc.
Nelms D. C.
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