Zero index for electro-optical measuring device

Details Zero index for electro-optical measuring device Zero index for electro-optical measuring device

1977-02-09

1978-06-27

Mullins, James B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, H01J 314

Patent

active

040977340

ABSTRACT:
Means for producing a counter reset pulse at the precise zero datum in an electro-optical measuring device comprises a sub-assembly including a light source, a patterned reticle, and a pair of photosensors, and a cooperating imaging reflector element. Each of the sub-assembly and reflector element are respectively mounted on the separate portions of the measuring device between which relative movement is effected during the measuring operation. Light from the source illuminates a pair of parallel transparent slots in the reticle pattern and is imaged back upon a second pair of transparent windows in the same reticle by the reflector element and is incident upon a pair of photosensors, each of which is associated with one of the windows. Equal illumination of each of the photosensors establishes the precise zero datum in the device and associated electronics provides a counter resetting pulse at that position.

REFERENCES:
patent: 3154688 (1964-10-01), Shepherd
patent: 3612881 (1971-10-01), King

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