| 摘要 |
PURPOSE:To improve reliability and working property by using laser beams vertically incident on a rotary shaft to center a hologram disc and the rotary shaft. CONSTITUTION:A laser beam 7' is vertically irradiated on a boss 4 centered in the same direction as the axial direction of the rotary shaft 3 fixed on a board 3 to center the boss 4 and a square glass dry plate 1' forming the hologram disc 1 is mounted on the boss 4. Then, laser beams 7a-7c are made vertically incident to match the center positions and then a pin point 2b is formed on photosensitive paper 13 adhered to the center part of the disc 1 by the beam 7' to execute disc working of the dry plate 1' around the point 2b. The worked disc 1 is mounted on the boss 4 provided with a flange 5, the beam 7' is matched with the point 2b by adjusting screws 6 or the like fitted to an edge end part 5a and the center part of the flange 5, the edge end part 5a and the disc 1 are adhered and hardened. |
