| 摘要 |
A lens inspection system for evaluating an objective lens system of an optical data recording/reproducing device by measuring a wave front of a light beam emerged from the objective lens system is provided with a laser source and a conversion lens. A laser beam is emitted by the laser source, and is incident on the objective optical system of the optical data recording/reproducing device. Further provided is an interferometer for measuring the wave front. A numerical aperture of an objective lens of the interferometer is smaller than a numerical aperture of the objective lens system of the optical data recording/reproducing device. The conversion lens receives the light beam emerged from the objective lens system of the optical data recording/reproducing device and emerges a light beam to the objective lens of the interferometer such that all the light beam emerged from the conversion lens enters the objective lens of the interferometer.
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