Electromagnetic wave shielding system for optical sensor having

Details Electromagnetic wave shielding system for optical sensor having Electromagnetic wave shielding system for optical sensor having

1990-03-23

1991-09-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Housings

250216, 250237R, H01J 502, H01J 314

Patent

active

050497413

ABSTRACT:
An electromagnetic wave shielding system for an optical sensor includes: a sensor body having an aperture through which an optical signal is made incident on the sensor body; a shielding plate disposed within the sensor body, the shielding plate having an opening having a dimension of at most about one-half of the wavelength of electromagnetic waves; an optical system for gathering the optical signal which passes through the aperture of the sensor body to the dimension of the opening in the shielding plate so that it can pass through the opening; and a detecting/processing unit for detecting and processing the optical signal which passes through the opening in the shielding plate. Thus, the electromagnetic waves which have entered are prevented from passing through or are remarkably attenuated by the opening in the shielding plate, and are thereby prevented from reaching the detecting/processing unit.

REFERENCES:
patent: 3090831 (1963-05-01), Schepler
patent: 3448274 (1969-06-01), Altman
patent: 3827806 (1974-08-01), Skagerlund
patent: 3936149 (1976-02-01), Imai
patent: 4015897 (1977-04-01), Konoma et al.
patent: 4040751 (1977-08-01), Baker et al.
patent: 4708444 (1987-11-01), Tsuji
patent: 4948969 (1990-08-01), Yokota

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