| 摘要 |
PROBLEM TO BE SOLVED: To precisely perform the positioning of a 2nd lens to a 1st lens of two lenses of a group even if contours of the 1st and 2nd lenses have errors. SOLUTION: The tilt detecting device is provided with two lenses of a group composed of the 1st lens 22 and the 2nd lens with a counter face 27 faced to an optical recording medium, a reference plane on which the two lenses of a group 21 are mounted, and a condenser lens 5 for irradiating the counter face 27 of the 2nd lens 23 with laser light emitted from a laser light source 2 in a focused state, and radiates the focused laser light toward the counter face 27 of the 2nd lens 23, and detects, in the neighborhood of the focal point of the light reflected by this counter face 27, a tilt of the above 2nd lens to the 1st lens by detecting a position on a plane perpendicular to the optical axis of the reflected light. COPYRIGHT: (C)2005,JPO&NCIPI
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