Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-03-26
1977-12-20
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
250231SE, G08C 906
Patent
active
040645045
ABSTRACT:
In a digital angle coder, a revolving disc bears a first series of marks ularly spaced around its axis, capable of being read by two diametrically-opposed fixed heads, and a second series of marks equal in number to the first, regularly spaced around the axis and capable of being read by two diametrically opposed movable heads. Each of the heads includes, for example, a grid reproducing a portion of the series of marks, a photo-emission element and a photo-receiving element. A first auxiliary mark may be read by a fixed auxiliary head and a second auxiliary mark may be read by a movable auxiliary head.
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patent: 2734188 (1956-02-01), Jacobs
patent: 2770798 (1956-11-01), Roth
patent: 2775755 (1956-12-01), Sink
patent: 2901170 (1959-08-01), Poole
patent: 3098152 (1963-07-01), Von Mathes
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patent: 3831169 (1974-08-01), Raser
Angelle Philippe
Bodin Jacques
DU Boisbaudry Dominique
Lepetit Marc
Levine Alan H.
Sloyan Thomas J.
Societe d'Etudes, Recherches et Constructions Electroniques - SE
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