US 5,705,897 AGranted

Apparatus for lighting alternating current discharge lamp

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorsYasumasa Hanazaki, Kenji Nakamura

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Abstract

An alternating current discharge lamp lighting apparatus including discharge lamp, tube wall temperature measuring unit, internal temperature inferring unit and period setting unit. The tube wall temperature measuring unit measures temperature of the tube wall of the discharge lamp. The internal temperature inferring unit infers internal temperature of the discharge lamp before discharge is started based on the tube wall temperature measured by the tube wall temperature measuring unit. The period setting unit sets a direct current voltage applying period based on the inferred internal temperature by the internal temperature inferring unit.

Claims27

Dependent claims

An apparatus for lighting a discharge lamp, comprising:

direct current power generating means for generating direct current power;
first internal state inferring means for inferring a first internal state of said discharge lamp;
adjusting means for adjusting a direct current voltage applying period during which said direct current voltage is applied to said discharge lamp based on said inferred first internal state, said adjusting means adjusting said direct current voltage applying period before applying said direct current voltage to said discharge lamp for the first time after receiving an instruction to start lighting said discharge lamp;
and
applying means for applying said direct current voltage and an alternating current voltage to said discharge lamp by switching said direct current power, said applying means applying said direct current voltage to said discharge lamp for said adjusted direct current voltage applying period upon receiving said instruction to start lighting said discharge lamp and for applying said alternating current voltage to said discharge lamp after said direct current voltage applying period elapses.

2 more elements

An apparatus for lighting a discharge lamp comprising:

a voltage applying unit which applies a direct current voltage to said discharge lamp;
a first internal condition inferring unit which infers a first internal condition of said discharge lamp;
an adjusting unit which adjusts a direct current voltage applying time period to apply said direct current voltage to said discharge lamp based on said first internal condition, said adjusting unit adjusting said direct current voltage applying period before applying said direct current voltage to said discharge lamp for the first time after receiving an instruction to start lighting said discharge lamp;
and
a controlling unit which controls said voltage applying unit to apply said direct current voltage to said discharge lamp for said adjusted direct current voltage applying time period after receiving said instruction to turn on said discharge lamp.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/795,134Filed 7 Feb 1997 · continuation
Priority: JP 6-16036412 Jul 1994
Granted: 6 Jan 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H05B 41/2882
Load circuits; Control thereof: the control resulting from an action on the static converter
H05B 41/386
During the transitional start-up phase: for speeding-up the lighting-up
H05B 41/388
During the transitional start-up phase: for a transition from glow to arc
Y10S 315/07
Electric lamp and discharge devices: systems: starting and control circuits for gas discharge lamp using transistors

Family

Serial345,829Parent of this continuation · filed 21 Nov 1994
US 5,705,897 AThis patent

From the US filing history. Foreign family members aren’t listed.

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