| 摘要 |
PURPOSE:To protect a plastic lens and to remove easily dirt and dust evem if they are stuck to a glass plate, by providing the glass plate between the plastic lens and a disc. CONSTITUTION:In an optical head device where the lens which condenses an optical beam onto a disc information face cnsists of a synthetic resin such as plastics or the like, a glass plate 5 is provided between a plastic lens 3 and the disc. The optical beam is condensed onto an information face 2 of a disc 1 by the plastic lens 3. The plastic lens is fixed to a case 4. The glass plate 5 is fixed to the case in the disc side of the plastic lens 3. A retaining ring 6 is provided for the glass plate 5. |
