Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1982-02-16
1984-10-09
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
250231SE, 340347M, G01D 534, H03D 1300
Patent
active
044764570
ABSTRACT:
A rotary encoder for producing a pair of pulse trains with a desired phase difference therebetween is provided. The encoder comprises a rotary plate provided with a plurality of slits arranged in the form of a ring and a stationary slit plate provided with two sets of slits spaced apart at a particular distance. In accordance with the present invention, a single light source and a pair of light-receiving elements are provided, and the rotary and stationary slit plates are provided such that their distance may be appropriately adjusted. With such a structure, a phase difference between the two signals obtained by the light-receiving elements may be precisely adjusted to an intended value.
REFERENCES:
patent: 4184071 (1980-01-01), Fryer et al.
Alps Electric Co. ,Ltd.
Shoup Guy W.
Sloyan T. J.
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