Patent ID: 7777421

Claim:
A light emitting device comprising one or more light emitting diodes and a lighting circuit for lighting said light emitting diodes, wherein; said lighting circuit has; a switching regulator for converting a DC power into a pulse power, an output control portion for lowering the voltage of a pulse power converted by said switching regulator, a pulse width adjusting oscillation means for adjusting the pulse width of a pulse power lowered in voltage by said output control portion, and a limiting resistor for limiting in current a pulse power adjusted in pulse width by said pulse width adjusting oscillation means and outputting the pulse power to said light emitting diodes and wherein said output control portion has a first resistor one end of which is connected to a compared voltage input of a voltage comparator of said switching regulator and the other end of which is grounded through a waveform shaping capacitor, and a second resistor one end of which is connected to the compared voltage input of said voltage comparator and the other end of which is grounded, wherein said first resistor has a resistance value of 3.0 kΩ to 9.0 kΩ, said second resistor has a resistance value of 1.0 kΩ to 2.0 kΩ, the ratio of the resistance value of said first resistor to the resistance value of said second resistor is 1.5 to 9.0, and said limiting resistor has a resistance value of 1.0 Ω to 100.0 Ω.