Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-09-10
1988-05-24
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250578, 356326, 356308, H01J 516, H01J 4014
Patent
active
047467932
ABSTRACT:
A photodiode assembly including a photodiode array having a linear arrangement of photodiodes, and a mask associated with the photodiode array to shade one or more selected photodiodes from incoming light of a particular frequency. The mask includes a frame provided with an elongated slot, and at least one bridge formed across the slot for shading the selected photodiode. The bridge portion is sufficiently wide to fully cover the selected photodiode and to partially cover the two adjacent photodiodes. An aperture is provided through the bridge in alignment with the selected photodiode to allow a portion of the incident light to impinge upon the selected photodiode.
REFERENCES:
patent: 3547542 (1970-12-01), Bulpitt et al.
patent: 4425501 (1984-01-01), Stauffer
Hewlett--Packard Company
Hickman Paul L.
Nelms David C.
Oen William L.
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