| 摘要 |
PURPOSE:To protect a lens and to avoid the leakage of the laser beam, by putting a cover over the radiation surface of the laser beam in case on disk is set to a player. CONSTITUTION:When no disk is set to a player, a solenoid 11 sets a masking plate 8 over the radiation surface 7 of a lens 3. Thus the surface of the lens 3 is protected, and at the same time the leakage of the laser beam can be prevented. |
