| 摘要 |
PURPOSE:To adjust the optical axis of an objective lens and to make the whole optical head compact by forming an abutting face between collar formed on the periphery of the objective lens and a supporting plate like a curve. CONSTITUTION:The abutting face 18 of the collar 14 or the abutting face of the supporting plate 10 or the abutting face between them is formed like a curve and constituted so as to have line contact with the abutted target. Consequently, the optical axis 5 is easily inclined, an adjusting mechanism is made unnecessary in an objective lens mechanism and the whole optical head is made compact. |
