JPS6419168U - - Google Patents

Description

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a schematic structural explanatory diagram of a synchronous detector, and FIGS. 2 a to 2 d are time charts. 1, 2...Rotating body (shaft), 3...Clutch, 4, 5...Gear, 6, 7...Pickup means, 6a, 7a...Pickup element, 8...Counter, 9...Basic clock generation Vessel, 10... Judgment means.

Claims (1)

[Scope of utility model registration request] a first pick-up means for extracting counter pulses with a period proportional to the rotational speed of the first rotating body; and a counter pulse with a period proportional to the rotational speed of the second rotating body at the same rate as the first pickup means. A second pickup means for taking out pulses, a basic clock generator for generating clock pulses of a constant period, and a counter pulse taken out from the first pickup means as an addition gate signal, and the basic clock is generated within the gate time. a counter capable of counting up the number of clock pulses generated by the basic clock generator, and using the counter pulses taken out from the second pickup means as a subtraction gate signal, and counting down the number of clock pulses generated by the basic clock generator within the gate time; , and determining means for comparing the final value of the counter after performing both counts with the initial value and outputting an output corresponding to the difference.