In-car rotation detecting apparatus

摘要

A rotation detecting device which issues a plurality of code signals by a simple configuration so as to detect the rotational angle position and the direction of rotation of a rotor according to the code signals. The rotation detecting device has a knob member (6) which is rotatably attached to a part of an enclosure, a plurality of projections (7) which are formed on the periphery of one end of the knob member (6), and two detection switches (18,19) which selectively engage with the projections to turn ON/OFF and issue signals. These detection switches (18,19) are disposed on a printed circuit board (4) in such a manner that they turn ON/OFF at different timings as the knob member (6) rotates. Thus, the rotational position and the direction of rotation of the knob member (6) are detected by the combinations of the ON/OFF signals of the detection switches (18,19).