High voltage incandescent lamp with low-pressure Kr/N.sub.2 gas fill
First Claim
1. An incandescent lamp, to be operated at a voltage of 200 to 275 volts, which comprises:
- a glass envelope bearing a tungsten filament and having an inner volume of about 0.2-2 ml/operating watt; and
a filling composition consisting of about 80-95% by volume of krypton gas and about 5-20% by volume of nitrogen gas, said filling composition being enclosed in the glass envelope in an amount of about 0.7-0.9 ml per ml of volume at standard temperature and pressure;
which lamp gives a color temperature of about 2,780 K. or higher in emitted light and has a life expectancy of approximately 150 hours or longer when operated a dc voltage of approximately 250 V.
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Accused Products
Abstract
An incandescent lamp which is operable at about 200-275 V is obtainable by enclosing a filling composition consisting of about 80-95% by volume of krypton gas and about 5-20% by volume of nitrogen gas in a glass envelope bearing a tungsten filament and an inner volume of about 0.2-1.2 ml/operating wattage in an amount of about 0.7-0.9 ml/ml of the inner volume. The incandescent lamp exhibits satisfactory luminous characteristics and an extended life expectancy without causing arc discharge even when operated at a voltage of about 200-275 V. Thus a lighting device which comprises such an incandescent lamp as the luminous source and a power source capable of energizing it at a voltage of about 200-275 V is very useful in general and special illumination.
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Citations
5 Claims
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1. An incandescent lamp, to be operated at a voltage of 200 to 275 volts, which comprises:
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a glass envelope bearing a tungsten filament and having an inner volume of about 0.2-2 ml/operating watt; and a filling composition consisting of about 80-95% by volume of krypton gas and about 5-20% by volume of nitrogen gas, said filling composition being enclosed in the glass envelope in an amount of about 0.7-0.9 ml per ml of volume at standard temperature and pressure;
which lamp gives a color temperature of about 2,780 K. or higher in emitted light and has a life expectancy of approximately 150 hours or longer when operated a dc voltage of approximately 250 V. - View Dependent Claims (2, 3, 4, 5)
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Specification
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- Resources
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Current AssigneeKen Hayashibara
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Original AssigneeKen Hayashibara
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InventorsMatsuda, Osamu, Yaguchi, Takahiro
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Primary Examiner(s)Pascal, Robert
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Assistant Examiner(s)Philogene, Haissa
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Application NumberUS08/266,598Time in Patent Office749 DaysField of Search315/291, 315/200 R, 315/205, 315/DIG. 7, 315/71, 315/56, 313/113, 313/115, 313/315, 313/317, 313/344, 313/578, 313/579, 313/643, 313/569, 313/636, 313/637US Class Current315/200.00RCPC Class CodesH01K 1/50 Selection of substances for...
