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US3742281A Expired / Lapsed US ⏱️ 0.0 years remaining

Controlled spectrum flash lamp

Assignee: Xerox Corp
•
Filing: 1971-03-22
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Granted: 1973-06-26
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Expires: 1991-03-22
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Abstract

Abstract A high intensity inert gas flash lamp adapted to be operated with a predetermined energy input, said lamp comprising a sealed elongated envelope formed of light transmitting material having a high melting point, electrodes operatively disposed within said envelope and adapted to sustain a pulsed arc discharge therebetween, a predetermined amount of a rare gas disposed within said envelope and a predetermined amount of at least one ionizable low vapor pressure metal or metal compound additive disposed on the tube wall, the relationship of the dimensions of said envelope and the amount of metal or metal compound additive in said envelope being such that during operation of said lamp sufficient power is supplied accorss the electrodes to form a shock wave of sufficient amplitude to evaporate substantially all of said ionizable additive material from the tube wall, providing high intensity flash illumination, the emission range of which can be tailored by the addition of several emission modifying additives in combination.

Inventors

  • 👤 Inally J Mc

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 18:14
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/24

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 142 words
A high intensity inert gas flash lamp adapted to be operated with a predetermined power input, said lamp comprising a sealed elongated envelope formed of light transmitting material having a high melting point, electrodes operatively disposed within said envelope and adapted to sustain a pulsed arc discharge therebetween, power means for applying said predetermined power input across said electrodes, a predetermined amount of rare gas and a predetermined Amount of an ionizable additive disposed within said envelope, the relationship of the dimensions of said envelope and the amount of additive in said envelope being such that during operation of said lamp sufficient pulsed energy is supplied by said power means across the electrodes to form an acoustical shock wave of sufficient amplitude to evaporate said ionizable additive and produce a spectral emission characteristic of both the rare gas and the ionizable additive.
Claim 2
Dependent Claim 142 words
A high intensity inert gas flash lamp adapted to be operated with a predetermined power input, said lamp comprising a sealed elongated envelope formed of light transmitting material having a high melting point, electrodes operatively disposed within said envelope and adapted to sustain a pulsed arc discharge therebetween, power means for applying said predetermined power input across said electrodes, a predetermined amount of rare gas and a predetermined Amount of an ionizable additive disposed within said envelope, the relationship of the dimensions of said envelope and the amount of additive in said envelope being such that during operation of said lamp sufficient pulsed energy is supplied by said power means across the electrodes to form an acoustical shock wave of sufficient amplitude to evaporate said ionizable additive and produce a spectral emission characteristic of both the rare gas and the ionizable additive.
Claim 3
Dependent Claim 25 words
The lamp of claim 1 in which the pressure of rare gas within the lamp is in the range of about 50 to 1,200 torr.
Claim 4
Dependent Claim 12 words
The lamp of claim 1 in which the additive is thallium iodide.
Claim 5
Dependent Claim 11 words
The lamp of claim 1 in which the additive is thallium.
Claim 6
Dependent Claim 27 words
The lamp of claim 4 having a length of at least 7 mm and adapted to be operated at an energy level of at least 45 Joules/cm.
Claim 7
Dependent Claim 17 words
The lamp of claim 3 in which mercury is disposed within the envelope along with thallium iodide.
Claim 8
Dependent Claim 11 words
The lamp of claim 1 in which the additive is aluminum.
Claim 9
Dependent Claim 16 words
The lamp of claim 1 in which the additive is a combination of lead and cadmium.
Claim 10
Dependent Claim 16 words
The lamp of claim 1 in which the additive is a combination of thallium and europium.
Claim 11
Dependent Claim 11 words
The lamp of claim 1 wherein the rare gas is xenon.
Claim 12
Dependent Claim 32 words
The lamp of claim 1 wherein said ionizable additive is coated upon the inner wall of said envelope, and wherein said shock wave evaporates said additive from the envelope wall during operation.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-06-25 1976-12-25 1977-06-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-06-25 1980-12-25 1981-06-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-06-25 1984-12-25 1985-06-26 $7700.00 Window Closed / Lapsed

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