LED ILLUMINATION DEVICE

PROBLEM TO BE SOLVED: To provide an LED illumination device emitting white-color light with stable brightness. SOLUTION: An input pulse signal D is turned into a drive pulse signal Dg shifted in phase by a time constant tg by a resistor Rg and a capacitor Cg. The drive pulse signal Dg is inputted in...

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Bibliographische Detailangaben
1. Verfasser:	KOBORI HIROSHI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS BLASTING ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF HEATING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED LIGHTING MECHANICAL ENGINEERING NON-PORTABLE LIGHTING DEVICES SEMICONDUCTOR DEVICES STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR SYSTEMS THEREOF VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an LED illumination device emitting white-color light with stable brightness. SOLUTION: An input pulse signal D is turned into a drive pulse signal Dg shifted in phase by a time constant tg by a resistor Rg and a capacitor Cg. The drive pulse signal Dg is inputted into a base of a transistor Tr10, a collector is connected to a current limiting resistor Rg' through an LED 12, and the current limiting resistor Rg' is connected to a power supply voltage Vcc. When the pulse drive signal Gf is H, the transistor Tr10 is turned on for a drive current to flow, and a light-emitting efficiency of the LED 12 is controlled by the current limiting resistor Rg'. Likewise, when the input pulse D is H, the drive signals Dg, Dr, Db are time-shifted in turn to become H, and LEDs 12, 14, 16 of RGB are lit in turn. Since resistance values of current limiting resistors Rg', Rr', Rb' are set in accordance with forward-direction voltages Vf of the LEDs 12, 14, 16, the light-emitting efficiency of the LEDs at light emission is made uniform. COPYRIGHT: (C)2006,JPO&NCIPI