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Control circuit for modulated laser beam

阅读:784发布:2022-05-14

专利汇可以提供Control circuit for modulated laser beam专利检索,专利查询,专利分析的服务。并且PURPOSE:To perform fast, accurate control operation and set a preset level with test pulses without recording control by replacing the light emission power of a semiconductor laser beam source which is modulated with recording data with a digital counted value. CONSTITUTION:When a recording start signal is inputted from a control circuit, a U/D counter 6 and a D/A converter 7 are reset and a mode changeover switch 8 is placed at the side of a terminal Ts to test pulses P1, P2, P3...PN shown by PM to a modulator 2. Consequently, a semiconductor laser light source 3 emits light intermittently to irradiate the surface S of a rotating optical disk through a lens L. The test pulses P1-P3 inputted to the terminal CLK of the U/D counter 6 are summed up successively and the output of the D/A converter 7 increases. Consequently, the supply current of a variable power source 1 increases gradually and the light emission power of the semiconductor light source 3 increases at intervals of the test pulses P1, P2, P3... and a detector 4 outputs a detection signal with a light emission power level shown by a waveform PD.,下面是Control circuit for modulated laser beam专利的具体信息内容。

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