Method and apparatus for sensing the presence of a sheet by shee

Details Method and apparatus for sensing the presence of a sheet by shee Method and apparatus for sensing the presence of a sheet by shee

1992-09-02

1993-11-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250319, 250561, G01V 904, H01J 4014

Patent

active

052586103

ABSTRACT:
A sheet detection apparatus (10) capable of detecting the presence of a sheet (18). The sheet detection apparatus (10) employs a heater (11) as a thermal emission source that emits radiant energy of a particular wavelength and a detector (12) having an output response that is a function of the particular wavelength and the intensity of the radiant energy of the heater (11). A sheet (18) inserted between the heater (11) and the detector (12) attenuates the emitted radiant received by the detector (12). The sheet detection apparatus (10) is capable of detecting sheets that are either opaque or transparent to visible light.

REFERENCES:
patent: 4034186 (1977-07-01), Bestenreiner et al.
patent: 4049947 (1977-09-01), Bestenreiner et al.
patent: 4323775 (1982-04-01), Hasegawa et al.
patent: 4352988 (1982-10-01), Ishida
patent: 4540887 (1985-09-01), Minerd et al.
patent: 4760790 (1988-08-01), Birkett
patent: 4841154 (1989-06-01), Yoshikawa et al.

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