| 摘要 |
PURPOSE:To drastically miniaturize and lighten the unit by forming an objective lens and its supporting member (inclusive of coil bobbin) in one body. CONSTITUTION:The objective lens supporting member 6, objective lens 7, and coil bobbin 8 are formed as an integral body with, for instance, plastic. Additionally, the lens 7 is formed in aspheric form at least in one surface. Or at least its one surface is formed with unequal-interval diffraction grating, and hence the lens is a grating lens. Because the objective lens 7, the objective lens supporter part 6, and the coil bobbin 8 are formed in an integral body, the moving part is miniaturized and lightened.
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