Portable length probe with improved wheel pick-up arrangement

Details Portable length probe with improved wheel pick-up arrangement Portable length probe with improved wheel pick-up arrangement

1982-09-29

1984-09-25

Smith, Alfred E.

Geometrical instruments

Area integrators

Electrical

33142, 250231SE, 250340, 250351, 377 24, 328 20, G01B 704

Patent

active

044728816

ABSTRACT:
A portable length probe having a length measuring wheel with light transmission holes at equally spaced angular intervals thereon, which wheel is rotatably mounted in an integral one piece nose body having a photo-responsive element and a light-emitting element disposed in aligned facing relation in a common bore formed in the nose body transverse to the wheel. The photo-responsive element is an infrared sensitive photo-transistor and the light emitting element is an infrared light emitting diode (LED), and both are encased in cylindrical opaque cases which fit in generally complementary sliding relation within the bore, the cases each having an optically open end facing one another. Increased accuracy is provided by employing frequency doubler circuitry in conjunction with the wheel, in which the wheel light transmission holes are substantially uniform in angular width and are spaced apart a distance substantially equal to such hole angular width.

REFERENCES:
patent: 3601585 (1971-08-01), Paulsen
patent: 3735142 (1973-05-01), Harr et al.
patent: 3790761 (1974-02-01), Crabtree
patent: 3821896 (1974-07-01), Grob
patent: 3846647 (1974-11-01), Tanimoto
patent: 3886354 (1975-05-01), Swiden et al.
patent: 4033883 (1977-07-01), Zinmeyer et al.
patent: 4156190 (1979-05-01), Chittenden et al.
patent: 4237617 (1980-12-01), Goussios
Sapwell, "Inexpensive Frequency Doubler", New Electron., (GB), 12(24), Dec. 11, 1979, p. 43.

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