Patent ID: 7091474
Filing Date: 2006-08-15
Classification: G01D

Abstract:
1. A rotation angle detecting device comprising: a housing that is formed by snap-connecting a cover to a case having an opening for allowing a rotating body to be rotatably supported; a resistance board that is fixed on an inner surface of the cover to have an opening into which the rotating body inserted; a slider rotating plate that has an opening into which the rotating body is inserted, that is disposed to be opposite to the resistance board, and that is rotatably supported by the cover; a first gear that is formed in the slider rotating plate; a slider that is fixed on the slider rotating plate and is slidably brought into contact with the resistance board; a code wheel that has a code pattern string thereon, that rotatably holds the slider rotating plate, and that is rotatably held in the cover and the case; a second gear formed in the code wheel; a circuit board that is fixed to the case; a plurality of signal detecting elements that are electrically connected to the circuit board to detect signals from the code pattern string; and a gear that is supported by the case, that has a third gear which is meshed with a first gear formed in the slider rotating plate and a fourth gear which is meshed with the second gear formed in the code wheel, and that decelerates the rotation of the code wheel to transmit the rotation to the slider rotating plate, wherein circular pin insertion holes through which a fixing pin passes so as to fix the code wheel in a position where an absolute angle is 0° are respectively formed in positions where the code wheel, the case, and the cover face each other, and in a position where the slider rotating plate and the pin insertion hole face each other, a pin insertion hole having a long-circular-arc shape in a circumferential direction of the slider rotating plate is formed to enable the slider rotating plate to be rotated within a predetermined angle range in a state where the fixing pin is inserted.