OPTICAL PICKUP AND INFORMATION EQUIPMENT

专利名称：OPTICAL PICKUP AND INFORMATION

EQUIPMENT

发明人：Makoto Kawamura申请号：US12440138申请日：20060929

公开号：US20090316560A1公开日：20091224

专利附图：

摘要：An optical pickup () includes: an irradiating device () for irradiating a laser beam(LB); a first light focusing device () for focusing the laser beam on the recording medium(); a collimator device () which is disposed on the optical path between the irradiating

device and the first light focusing device and which can be displaced along the opticalpath of the laser beam; a splitting device () which reflects one portion of the laser beamand transmits therethrough another portion of the laser beam; a light receiving device ()for receiving the reflected one portion of the laser beam; and a second light focusingdevice () for focusing, on the light receiving device, the reflected one portion of the laserbeam, the light receiving device and the first light focusing device is disposed at a positionat which rate of change in light density of the laser beam on the first light focusing devicebefore and after displacement of the collimator device is substantially the same as thaton the light receiving device before and after the displacement of the collimator device.

申请人：Makoto Kawamura

地址：Saitama JP

国籍：JP

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