Throttle-opening sensor

A throttle-opening sensor, comprising:

• a detect shaft rotatable about an axis in conjunction with a throttle grip;
• a pair of rotation terminals respectively disposed on different positions in the same circle with the rotation axis of the detect shaft as a center thereof, the pair of rotation terminals being rotatable together with the detect shaft;
• first and second contact pieces disposed on each of the rotation terminals at predetermined intervals in a rotation-radius direction of the pair of rotation terminals;
• a printed circuit including a first conducting pattern portion printed along sliding loci of the first contact pieces and a second conducting pattern portion printed along sliding loci of the second contact pieces;
• a resistance portion printed in a sliding range of the first or second contact piece of the first or second conducting pattern portion, and generating a resistance against a current flowing in the first or second conducting pattern portion,
• wherein at least two detection signals variable in mutually opposite directions according to the rotation angles of the throttle grip are generated due to that the first and second contact pieces respectively allow the first and second conducting pattern portions to conduct therebetween;
• and
• a second resistance portion that is connected in series with the resistance portion.