| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical axis adjustment device capable of detecting the position of a drive rod and realizing downsizing. SOLUTION: The optical axis adjustment device 1 is provided with a drive rod 2 of which one end side in center axis direction is connected to a lighting apparatus, a driving device 3 which is connected to the other end side in center direction of the drive rod 2 and moves the drive rod 2 to the center axis direction, a hollow detection coil 5 which is arranged between the one end side in center axis direction and the other end side and in which the drive rod 2 is installed movably in the center axis direction, and a detection circuit part 7 which outputs an output signal showing the position information of the drive rod 2 based on the output of the detection coil 5. The drive rod 2 is made by jointing a shaft part 20 and a core 21 which are members having different magnetic permeability in the center axis direction, and the jointing portion P of the drive rod 2 is located inside the detection coil 5 within the movement range of the drive rod 2. COPYRIGHT: (C)2008,JPO&INPIT |
