Patent ID: 8411289

Claim:
An optical position detection device adapted to optically detect a position of a target object, comprising: a position detecting light source adapted to emit at least one detection light beam toward one side in a Z-axis direction intersecting an X-axis direction and a Y-axis direction intersecting each other; a first light detector having a light receiving section directed to the one side in the Z-axis direction; a second light detector located at a position on the one side in the Z-axis direction, the position being distant from the position detecting light source and the first light detector, and having alight receiving section directed to the one side in the Z-axis direction; and a position derivation section adapted to derive a position of a target object located in a first space between the first light detector and the second light detector and a position of a target object located in a second space on the one side of the second light detector in the Z-axis direction based on a light receiving result in the first light detector and a light receiving result in the second light detector.