Focus detecting method
专利汇可以提供Focus detecting method专利检索，专利查询，专利分析的服务。并且PURPOSE: To detect a focus state accurately all the time by arranging a relay lens between an optical member and a photodetector.
CONSTITUTION: A polarized beam radiated from a light source 21 is made into parallel luminous flux by a collimator lens 22, and a disk 26 is irradiated with it as a spot through a polarizing prism 23, a quarter-wavelength plate 24 and an objective lens 25. Reflected light from the disk 26 is condensed by the objective lens 25 and made incident to a detection prism 27 through the quarter-wavelength plate 24 and polarizing prism 23. The reflecting surface 27a of this detection prism 27 is set nearly at a critical angle to the parallel incident luminous flux in an infocus state, and the light reflected by the reflecting surface 27a is made incident to a photodetector 29 through a relay lens 28. This photodetector 29 has two-split photodetection areas 28A and 28B, and a difference between the outputs of those photodetection areas 28A and 28B is found by a differential amplifier 30 to obtain a focus error signal at an output terminal 31.
COPYRIGHT: (C)1982,JPO&Japio，下面是Focus detecting method专利的具体信息内容。
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6 电池单元
