Apparatus for detecting sheet-formed support material

Details Apparatus for detecting sheet-formed support material Apparatus for detecting sheet-formed support material

1979-06-18

1981-07-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, G02F 101

Patent

active

042812445

ABSTRACT:
In an electrophotographic copying apparatus of a powder image transfer type, apparatus for detecting a transparent copy sheet passing along a predetermined transporting path including a light source provided with a first polarizing filter, and a photoresponsive element provided with a second polarizing filter; the relative spacing relationship between a plane of polarization of the first polarizing filter and a plane of polarization of the second polarizing filter is so arranged that the amount of a light received by the photoresponsive element is increased when the transparent copy sheet is passed across a light path originating from the light source.

REFERENCES:
patent: 3124637 (1964-03-01), Heitzer
patent: 3609737 (1971-09-01), Lustig
patent: 3693969 (1972-09-01), Sakamaki et al.
patent: 3963348 (1976-06-01), Nakatani et al.
patent: 4027155 (1977-05-01), Rappaport
patent: 4072854 (1978-02-01), Oshima et al.

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