DISCHARGE LAMP, LAMP DEVICE, LIGHTING DEVICE AND LIQUID CRYSTAL PROJECTOR

Japanese Patent JP3665160

B2

PROBLEM TO BE SOLVED: To satisfy a condition preventing generation of a crack in a bulb of a discharge lamp caused by a root discharge, and prevent devitrification caused by a temperature rise.
SOLUTION: In a discharge lamp 1 formed by sealing a discharge medium containing at least metal halide and mutually opposed anode 9 and cathode 12 in a bulb 2 formed by quartz glass, a heat insulating film 13 is provided, which heat insulates partly a total periphery in a side of a cathode 12 of the bulb 2 in a range of necessary minimum limit enough for preventing a root discharge between a tip end of the anode 9 and in the vicinity of a root of the cathode at the time of lighting beginning. Accordingly, generation of a crack in the bulb 2, caused by the root discharge, can be prevented. At lighting time, a temperature of the bulb 2 in an upper part is generated higher than in a lower part by convection, but by limiting a heat insulating region of the periphery in a side of the cathode 12 of the bulb 2 by the heat insulating film 13, in the case of a use condition of horizontal lighting in a condition of the heat insulating film 13 facing a down side, heat radiating action in the upper part of the bulb 2 is promoted, devitrification can be prevented.

JP2000180955	PROJECTOR DEVICE AND ITS LENS DRIVING DEVICE
JP2011205492	MOBILE TERMINAL APPARATUS
JP2008065277	PROJECTION-TYPE DISPLAY DEVICE

Murase Nanao
Yasuhiro Iwato
Hiromichi Kawashima
Mamoru Furuya

JP34997196A

June 29, 2005

December 27, 1996

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Harrison Toshiba Lighting Corp.

G03B21/00; F21S2/00; G03B21/20; H01J61/35; H01J61/52; (IPC1-7): H01J61/35; F21S2/00; G03B21/00; G03B21/20

JP8069775A
JP4206437A
JP8241694A
JP60072154A

Shinji Kashiwagi
Naoto Koyama
Akira Kashiwagi

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