Optical pickup device

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	Optical pickup device
其他题名	Optical pickup device
	MINEMURA KOUICHI
	1983-09-12
专利权人	NIPPON DENKI KK
公开日期	1983-09-12
授权国家	日本
专利类型	发明申请
摘要	PURPOSE:To reduce noise by driving a semiconductor laser by a current containing an AC component, and thus decreasing variation ratio of the longitudinal oscillation mode of the semiconductor laser. CONSTITUTION:To the semiconductor laser 1, a sine-wave signal source 2 is connected through a resistance 3 and a capacitor 4 and a DC current is applied through a resistance 5 to obtain an impulsive output of about 60MHz in frequency. Part of the light output is monitored by a photodetector 6, whose mean output level is compared with the reference level at a terminal 7 by a comparing circuit 8; and a DC bias current is controlled so that the difference between the both is eliminated, thus holding the output power of the semiconductor laser 1 constant. Then, this output is passed through a lens 10, polarization prism 11, quarter-wavelength plate 12, and lens 13 to illuminate an optical disk 14. Reflected light from the optical disk 14 is reflected by the prism 11 and guided to a photodetector 15. Consequently, the number of longitudinal oscillation modes of the semiconductor laser 1 is a large number, so the variation ratio of the longitudinal modes is small, and the generation of noise is less.
其他摘要	用途：通过包含AC分量的电流驱动半导体激光器来降低噪声，从而降低半导体激光器的纵向振荡模式的变化率。组成：对于半导体激光器1，正弦波信号源2通过电阻3和电容器4连接，并且通过电阻5施加直流电流，以获得频率约为60MHz的脉冲输出。部分光输出由光电探测器6监视，光电探测器6的平均输出电平通过比较电路8与端子7处的参考电平进行比较。并且控制DC偏置电流，以便消除两者之间的差异，从而保持半导体激光器1的输出功率恒定。然后，该输出通过透镜10，偏振棱镜11，四分之一波长板12和透镜13以照射光盘14.来自光盘14的反射光被棱镜11反射并被引导到光电探测器15。因此，半导体激光器1的纵向振荡模式的数量是大量的，因此纵向模式的变化率小，并且噪声的产生较少。
申请日期	1982-03-05
专利号	JP1983153239A
专利状态	失效
申请号	JP1982034696
公开（公告）号	JP1983153239A
IPC 分类号	G06K7/10 \| G11B7/125 \| G11B7/126 \| H01S5/042 \| H01S5/0683 \| G11B7/12 \| H01S3/10
专利代理人	-
代理机构	-
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/68652
专题	半导体激光器专利数据库
作者单位	NIPPON DENKI KK
推荐引用方式 GB/T 7714	MINEMURA KOUICHI. Optical pickup device. JP1983153239A[P]. 1983-09-12.

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