| 摘要 |
A coma aberration correcting method in an optical pickup for generating a plurality of light beams forming a plurality of light focused points is provided with processes of: measuring an optimum angle which is an angle with respect to respective one of the information record media of the pickup body by tilting the pickup body while irradiating each of the light beams under a condition where the actuator is fixed on the pickup body; calculating a pickup body fixing angle on the basis of (i) a first variation rate measured in case that only the actuator is tilted with respect to respective media, (ii) a second variation rate measured in case that the actuator is fixed on the pickup body and that the pickup body as a whole is tilted with respect to respective one of the information record media, and (iii) the measured optimum angle; calculating an actuator fixing angle; and fixing the pickup body so as to have the calculated pickup body fixing angle, and fixing the actuator on the pickup body so as to have the calculated actuator fixing angle.
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