| 摘要 |
PURPOSE:To fix tightly a tracking spring and a focus spring with thin adhesives and to improve stability in a servo system by dividing some of a lens supporting member, an intermediate supporting body and a fixed supporting body with the fitting part of a tracking spring and a focus spring as a part of a boundary. CONSTITUTION:An objective lens lens-barrel 11 is divided into an inside part 11a and an outside part 11b with the fitting part of a tracking direction moving parallel spring 12 as a boundary, and to the part, the upper edge part of a tracking spring is respectively bonded. In this case, while the inside part 11a and the outside part 11b are divided, respective parts can be processed independently, and therefore, they can be processed to an arbitrary thickness in accordance with the thickness of the tracking spring 12. Thus, the thickness of the adhesives to bond the tracking spring 12 can be made very thin, the spring constant of the adhesives can be much larger than the spring constant in the focus direction of the tracking spring 12.
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