LIGHTING SYSTEM

Japanese Patent JP2934926

B2

PURPOSE: To improve visual work efficiency and accuracy by radiating light of not delaying an appearance latent time of a positive event related electric potential making its appearance after a latent time of around 300 milliseconds is paused when visual work and so on are carried out under a certain light illumination.
CONSTITUTION: When an electric power supply is turned on, a microcomputer 3 forms pulses at a zero crossover being detected by a zero crossover detecting function, and discriminates frequency of an alternating current electric power supply from its time interval. Next, driving pulses being delayed by a constant time from a leading or a trailing edges of the alternating current electric power supply are supplied to a control pole G of a two-way electrical continuity control rectifying element DCR, so that the DCR is ignited. A phase angle of these driving pulses is small at first, but is increased gradually in a constant time. Thereby, a main electric current of the DCR is increased with the lapse of time, and this is smoothed by means of a capacitor C1 through a diode bridge D1. Thereby, a direct current being increased gradually with the lapse of time is impressed upon both ends of an incandescent lamp 1. Both end voltage of the lamp 1 being increased gradually in a constant time after the electric power supply is turned on is set by means of a light dimming variable resistance VR. This light dimming range is within 20-130%.

MATSUDA OSAMU
OGIMOTO NAOTO
IWASHIMA HIROYOSHI

JP18575592A

August 16, 1999

June 22, 1992

Click for automatic bibliography generation  

HAYASHIBARA TAKESHI

F21S2/00; H05B39/04; H05B39/00; H05B39/08; (IPC1-7): H05B39/00; F21S1/00

JP359994A
JP6295154A
JP57206935A

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