发明名称 |
Optical information recording and reproducing apparatus |
摘要 |
In an optical information recording and reproducing apparatus having a laser light source and an optical system so that a beam from the laser light source is irradiated through the optical system on an information recording medium to record and reproduce information, an accousto-optic modulator is disposed in the optical system for receiving the beam from the laser light source, and a modulation unit is provided which comprises an oscillator for generating a plurality of signals at different frequencies, a modulator for modulating the outputs of the oscillator and an adder for adding together the outputs of the modulator.
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申请公布号 |
US4656618(A) |
申请公布日期 |
1987.04.07 |
申请号 |
US19840639004 |
申请日期 |
1984.08.09 |
申请人 |
HITACHI, LTD. |
发明人 |
KAKU, TOSHIMITSU;KATAOKA, KEIJI;TSUNODA, YOSHITO;SHIGEMATSU, KAZUO |
分类号 |
G11B7/004;G11B7/09;G11B7/12;G11B7/125;G11B27/36;(IPC1-7):G11B7/125 |
主分类号 |
G11B7/004 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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