Abstract: A light emitting device, which includes a plurality of light emitting elements each having a different chromaticity of emission light, to emit mixed light produced by mixing the respective emission light of the plurality of light emitting elements together, includes a receiving section to obtain command information on the mixed light, a driving section to perform a PWM drive on the plurality of light emitting elements on the basis of the command information, and a storing section to store correction information to be set on the basis of measurement results on the respective emission light of the plurality of light emitting elements. The driving section is being configured in such a manner as to, on the basis of the correction information, correct a duty ratio in the PWM drive to be set in accordance with the command information, and perform the PWM drive on the plurality of light emitting elements.

Abstract: An illumination device includes: an elongated light guide; a first light source; a second light source; and a controller. A first increase beginning time point at which the brightness of the first light source begins to increase from zero is prior to a second increase beginning time point at which the brightness of the second light source begins to increase from zero. A first increase finish time point at which the brightness of the first light source finishes increasing to the first set brightness is simultaneous with or prior to a second increase finish time point at which the brightness of the second light source finishes increasing to the second set brightness. A time from the first increase beginning time point to the second increase finish time point is not more than 0.2 seconds.

Abstract: An illumination device includes: an elongated light guide; a first light source; a second light source; and a controller. A first increase beginning time point at which the brightness of the first light source begins to increase from zero is prior to a second increase beginning time point at which the brightness of the second light source begins to increase from zero. A first increase finish time point at which the brightness of the first light source finishes increasing to the first set brightness is simultaneous with or prior to a second increase finish time point at which the brightness of the second light source finishes increasing to the second set brightness. A time from the first increase beginning time point to the second increase finish time point is not more than 0.2 seconds.

Abstract: A lighting power supply device receives a voltage converted from an alternating current to a direct current by a rectifying circuit rectifying the alternating current whose phase is controlled by a phase control type dimmer, and generates and outputs a direct current voltage/current to be supplied to a load. The lighting power supply device includes: a control circuit, and the control circuit gradually decreases a current drawn from the rectifying circuit from a predetermined current value set in advance, determines a current value immediately before detecting a malfunction of the phase control type dimmer as a drawn current value, and performs current control so as to maintain the determined current value.

Abstract: A power source controlling IC controlling a current flown through the primary side winding of a transformer is provided with an external terminal to which a detected voltage from the secondary side is fed back through a photocoupler; a control circuit generating and outputting a control signal of a switching element controlling the current according to an input voltage; a voltage generating circuit generating an internal reference voltage based on the input voltage; a pull-up section connected to the terminal to pull up the potential of the terminal to the internal reference voltage to give a bias voltage to a light receiving element of the photocoupler; and a voltage comparing circuit comparing the voltage of the external terminal and a predetermined reference voltage, wherein the control circuit stops outputting the control signal based on the output of the first voltage comparing circuit when detecting an abnormality.

Abstract: A lighting power supply device receives a voltage converted from an alternating current to a direct current by a rectifying circuit rectifying the alternating current whose phase is controlled by a phase control type dimmer, and generates and outputs a direct current voltage/current to be supplied to a load. The lighting power supply device includes: a control circuit, and the control circuit gradually decreases a current drawn from the rectifying circuit from a predetermined current value set in advance, determines a current value immediately before detecting a malfunction of the phase control type dimmer as a drawn current value, and performs current control so as to maintain the determined current value.

Abstract: A power source controlling IC controlling a current flown through the primary side winding of a transformer is provided with an external terminal to which a detected voltage from the secondary side is fed back through a photocoupler; a control circuit generating and outputting a control signal of a switching element controlling the current according to an input voltage; a voltage generating circuit generating an internal reference voltage based on the input voltage; a pull-up section connected to the terminal to pull up the potential of the terminal to the internal reference voltage to give a bias voltage to a light receiving element of the photocoupler; and a voltage comparing circuit comparing the voltage of the external terminal and a predetermined reference voltage, wherein the control circuit stops outputting the control signal based on the output of the first voltage comparing circuit when detecting an abnormality.