Apparatus for proximity detection of an opaque pattern on a tran

Details Apparatus for proximity detection of an opaque pattern on a tran Apparatus for proximity detection of an opaque pattern on a tran

1984-06-29

1986-03-18

Morgenstern, Norman

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250550, 350166, H01J 314

Patent

active

045770999

ABSTRACT:
The physical separation between a rear illuminated opaque pattern on a translucent substrate and an optical pattern sensing device viewing the shadow image of the opaque pattern is increased without any corresponding loss of resolution (and/or resolution may be increased without any corresponding reduction in the physical separation between the optical pattern sensing device and the opaque pattern) by positioning a narrow spectral band pass interference filter between the opaque pattern and the optical pattern sensing device, and using as the rear illumination, light having a spectrally narrow band which substantially matches the pass band of the interference filter.

REFERENCES:
patent: 3278752 (1966-10-01), Brixner
patent: 3761184 (1973-09-01), McLaughlin
patent: 4184749 (1980-01-01), Grossman

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