专利汇可以提供Track pitch detector for optical information recording medium and optical information recording medium driver专利检索,专利查询,专利分析的服务。并且PURPOSE: To know statistically track pitch by using diffracted light from an information track of an optical information recording medium so as to form an image of Fraunhofer onto a photodetector, thereby observing the intensity distribution of the diffracted light.
CONSTITUTION: Laser light 7 from a light source 2 is made into collimated light via a half mirror 3 and a lens 4 and projected on an optical information recording disk D. The beam 7 is reflected in a reflection film S and the image is formed again onto a photodetector 5 through the lens 4 and the half mirror 3 again. In such a case, the information track T formed on the disk D becomes a diffraction grating to diffract the beam 7 and its reflected light 8 is subject to Fourier transformation by the lens 4 and a Fraunhofer image is formed onto the photodetector 5. Since the intensity distribution of the image is fluctuated by the pitch of the track T, the track pitch is obtained statistically by a data processing unit 6 from the fluctuation.
COPYRIGHT: (C)1988,JPO&Japio,下面是Track pitch detector for optical information recording medium and optical information recording medium driver专利的具体信息内容。
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