| 摘要 |
PURPOSE:To prevent a adhesive agent from being sticked to an optical recording film and to make the coating of the adhesive agent and assembling work easy, by providing grooves which absorb the excessive agent on a plane to be bonded between an element disc and a spacer. CONSTITUTION:A device hole 6 which pieces element discs 1, 2 is drilled at the center of an inner spacer 4 and circular grooves 8 are engraved on a bonded plane 7 of the spacer 4 at intervals concentrically. An adhesive agent 9 is coated between the grooves 8, 8 on the plane 7, and bonding is made by overlapping the discs 1, 2 on the plane 7. At this time, the excessive adhesive agent is pushed around at each plane 7 and absorbed in the grooves 8 and can not flow out at inner and outer circumferences of the spacer 4. No adhesive agent 9 is stuck on an internal optical recording film 3. |
