Reflex type optical sheet sensor having a dustproof plate with a

Details Reflex type optical sheet sensor having a dustproof plate with a Reflex type optical sheet sensor having a dustproof plate with a

1991-11-25

1992-12-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250216, 2502221, G01N 2186

Patent

active

051720035

ABSTRACT:
An optically transparent dustproof plate provided to a reflex type optical sheet sensor being for detecting passage of a sheet, transferred in front of the sheet sensor, by irradiating light from a light source provided in the sheet sensor to the sheet and receiving light reflected from the sheet at a light sensor provided in the sheet sensor, the sheet sensor being for protecting the light source and the light sensor from dust and having an outer surface, which faces outside of the dustproof plate, roughed for dispersing the irradiating light so as to decrease light reflected at the outer surface and received to the light sensor and an inner surface, which faces inside of the sheet sensor, inclined against the irradiating light so as to prevent light reflected at the inner surface from directing to the light sensor.

REFERENCES:
patent: 4540887 (1985-09-01), Minerd et al.
patent: 4701613 (1987-10-01), Watanabe et al.

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