Position-input encoders

Claim 1

AN ENCODER FOR CONVERTING THE MOVEMENT OF AN INPUT MEMBER INTO A CODE OF DIGITAL SIGNALS AND COMPRISING: (A) A ROTATABLE DISC, (B) A CONTINUOUS CONDUCTOR HAVING THREE WAVES PATTERNS OF ONE, TEN AND ONE HUNDRED CYCLES, RESPECTIVELY, CONCENTRICALLY ARRANGED ON ONE FACE OF SAID DISC, (C) TEN DETECTOR COILS IN SPACED ARRANGEMENT ALONG THE PATHS OF MOVEMENT OF EACH OF SAID ONE AND TEN WAVE PATTERNS AND WITH COILS ASSOCIATED WITH EACH OF SUCH PATTERNS PAIRED IN V-SCAN ARRANGEMENT, (D) FIVE DETECTOR COILS IN THE PATH OF MOVEMENT OF SAID ONE HUNDRED CYCLE PATTERN AND SPACED THEREALONG AT INTERVALS OF N+1/10 WAVE PITCH WHERE N IS AN INTEGER, (E) MEANS FOR ENERGIZING SAID CONDUCTOR WITH HIGH FREQUENCY ALTERNATING CURRENT, (F) PLURALITIES OF PHASE SENSITIVE DETECTOR FOR DETECTING THE OUTPUTS OF SAID DETECTOR COILS AND PRODUCING A PREDETERMINED NUMBER OF PULSES FOR EACH WAVE LENGTH ADVANCE OF EACH WAVE PATTERN EFFECTED BY THE ROTATION OF SAID DISC, AND (G) DECODING MEANS CONNECTED TO THE OUTPUT OF SAID PHASE SENSITIVE DETECTORS AND PROVIDING OUTPUT SIGNALS IN A DESIRED DIGITAL CODE INDICATIVE OF THE ROTATIONAL POSITION OF SAID DISC.