Photoelectric key switch device with notched rotor

Details Photoelectric key switch device with notched rotor Photoelectric key switch device with notched rotor

1984-05-31

1986-06-10

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

70DIG51, 307 10AT, E05B 3500, H01H 2700

Patent

active

045945055

ABSTRACT:
A photoelectric key switch device for preventing error of the output timing of electrical signals from a group of light-receiving elements, while operating an electric processing unit by signals that are simultaneously produced. The device is provided with a rotor having a notch that forms optical paths between the elements of a group of light-emitting and light-receiving elements, other than one set of elements, when a key is inserted into the rotor and the rotor is rotated through a pre-determined angle. Another notch forms an optical path between the set of elements and the aforementioned one set of elements when the rotor is additionally rotated through an angle .alpha..

REFERENCES:
patent: 3870895 (1975-03-01), Lax et al.
patent: 3889501 (1975-06-01), Fort

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