Patent ID: 9307125
Filing Date: 2016-04-05
CPC Classification: G01D,G01P,G01S,G02B,H04N

Claim Text:
1. A position detection device comprising: a detection unit configured to have a photo-reflector including a light emitter and a light receiver, the light receiver receiving light emitted from the light emitter and reflected by a reflective surface moved in a predetermined direction, the detection unit detecting a movement amount of the reflective surface based on a change in intensity of the received light; and a transparent member configured to be disposed between the reflective surface and the detection unit and to move together with the reflective surface, the transparent member being provided with a light blocking surface configured to block light and a light transmitting surface configured to transmit light, the light blocking surface and the light transmitting surface being arranged in a moving direction of the reflective surface, wherein a distance from the reflective surface to the photo-reflector is longer than a distance from the light blocking surface to the photo-reflector.