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Patent Searching and Data


Title:
照明装置およびLED式スポットライト
Document Type and Number:
Japanese Patent JP4661292
Kind Code:
B2
Abstract:
The invention provides a lighting system that can easily achieve a desired color rendering property or color temperature even if there are variations in optical characteristics among a plurality of LEDs. A setting means 22 sets an output value of light emitted from LEDs and a duty ratio in association with each other for each group of LEDs having different emission colors so that the color temperature of a color mixture of a plurality of LEDs 13 reaches a predetermined value. A converting means 23 converts an inputted light modulation signal to a PWM signal. A PWM controlling means 24 controls lighting of each group of LEDs having different emission colors through a driver 21 based on the same PWM signal outputted from the converting means 23.

Inventors:
Keitaro Kosaka
Koji Umeda
Koichi Honda
Junya Murata
Application Number:
JP2005085521A
Publication Date:
March 30, 2011
Filing Date:
March 24, 2005
Export Citation:
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Assignee:
Toshiba Lighting & Technology Corporation
International Classes:
H05B37/02; F21S2/00; H05B41/36
Domestic Patent References:
JP2001307502A
JP2001514432A
Attorney, Agent or Firm:
Mitani Megumi