| 摘要 |
PURPOSE:To increase the extended processing performance of CPU and simplify a circuit composition by outputting an objective value for bias current against the first luminous amount control system and an objective value for oscillation current against the second luminous amount control system selectively from a common output port, and outputting the objective values for bias current and oscillation current to the first or second luminous amount control system while maintaining the both objective values using an analog circuit. CONSTITUTION:An objective value for bias current Db or an objective value for oscillation current Dp which are output CPU 21 acting as a luminous energy control means concurrently, is converted by a D/A converter, and the first or second objective voltage signal for analog luminous energy which is converted by the D/A converter is output to a back stage analog switching circuit 2. The first objective voltage signal for analog luminous amount converted by the D/A converter is output to a voltage holding circuit 3a, and the second objective voltage signal for analog luminous amount converted by the D/A converter is output to a voltage holding circuit 3b. In addition, the voltage holding circuits 3a, 3b hold the first or second voltage signal for analog luminous amount control converted by the D/A converter for a prearranged time. |
