Controller for oscillating output of semiconductor laser

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	Controller for oscillating output of semiconductor laser
其他题名	Controller for oscillating output of semiconductor laser
	GOJIMA KENJI; HIRASAWA KAZUO
	1982-11-02
专利权人	MITSUBISHI DENKI KK
公开日期	1982-11-02
授权国家	日本
专利类型	发明申请
摘要	PURPOSE:To correct the level-down of information regenerative signals in the inner circumference of a recording carrier by controlling the oscillating output of the semiconductor laser in response to control signals correlating to the level of reflected light from the recording carrier. CONSTITUTION:Beams C reflected from a disk are changed into FM signals corresponding to a video synchronous signal component through an optical detector 9, a pre-amplifier 10 and a band-pass filter 11, and the envelope level of the FM signals is detected by means of an AM detector 12. The output of the detector 12 and the reference voltage of a reference voltage source 13 are compared by means of a comparator 14, and the comparison output is given to a power amplifier 7 through a low-pass filter 15 as the control signals of the oscillating output. Accordingly, the power of the oscillating output of the semiconductor laser is controlled so that the regenerative signals obtain a level in the same extent as the outer circumference even when laser beam spots are positioned at any location of the disk 7.
其他摘要	目的：通过响应于与来自记录载体的反射光水平相关的控制信号控制半导体激光器的振荡输出，来校正记录载体内圆周中信息再生信号的电平降低。组成：从光盘反射的光束C通过光学检测器9，前置放大器10和带通滤波器11变为对应于视频同步信号分量的FM信号，并且通过以下方式检测FM信号的包络电平：通过比较器14比较检测器12的输出和参考电压源13的参考电压，并且通过低通滤波器15将比较输出提供给功率放大器7。作为振荡输出的控制信号。因此，控制半导体激光器的振荡输出的功率，使得即使当激光束斑点位于盘7的任何位置时，再生信号也获得与外圆周相同程度的水平。
主权项	-
申请日期	1981-04-28
专利号	JP1982178391A
专利状态	失效
申请号	JP1981064608
公开（公告）号	JP1982178391A
IPC 分类号	G11B7/00 \| G11B7/005 \| H01S5/068 \| H01S5/0683 \| H01S3/096
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/181661/59272
专题	半导体激光器专利数据库
作者单位	MITSUBISHI DENKI KK
推荐引用方式 GB/T 7714	GOJIMA KENJI,HIRASAWA KAZUO. Controller for oscillating output of semiconductor laser. JP1982178391A[P]. 1982-11-02.

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