| 摘要 |
PURPOSE:To control the wavelength of emitted light by receiving the temperature information from a temperature measuring means and the driving-power information from a a driving-power control means, computing the wavelength of the emitted light of a light emitting element and controlling the driving-power control means based on the result of the computation. CONSTITUTION:The temperature signal, which is detected from an LED lamp, is converted into an LED-temperature measuring means 4 having a voltmeter and an A/D converter. The temperature information is inputted into an operating means 5. Meanwhile, the voltage value and the current value, which are applied on the LED from an LED-driving-current measuring/controlling means 2 and an LED-applied-voltage measuring/ controlling means 3, are inputted into the operating means. Operation is performed with the operating means 5 based on the expression I. The energy of the wavelength of the present emitted light is computed. The difference from the wavelength of the light is obtained with an emitted-light-wavelength controlling means 6 based on the result of the computation. The current measuring/controlling means 2 and/or the voltage measuring/controlling means 3 are controlled, and the wavelength of the emitted light is controlled based on the expression I. In the expression I, coefficient alpha and beta are values obtained by experiments. |
