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Cold Pulsed Operation of a Short Arc Lamp

IP.com Disclosure Number: IPCOM000095305D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Mix, AL: AUTHOR [+2]

Abstract

The device includes an arc lamp that is operated by high-repetition rate pulses. High-intensity spot illumination for use in photographic, stroboscopic, printing, or similar applications is realized. Point source, arc lamp 1 has anode, cathode, and trigger electrodes 2, 3, and 4. Lamp 1 is of the short arc variety, containing a noble gas, such as xenon, krypton, or similar gases under high pressure. Associated with lamp 1 is reflector 5. This is for focusing and directing light emitted during each cycle of operation of lamp 1 to a spot location 6 on a moving support member 7, the characteristics of which depend upon the application.

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Cold Pulsed Operation of a Short Arc Lamp

The device includes an arc lamp that is operated by high-repetition rate pulses. High-intensity spot illumination for use in photographic, stroboscopic, printing, or similar applications is realized. Point source, arc lamp 1 has anode, cathode, and trigger electrodes 2, 3, and 4. Lamp 1 is of the short arc variety, containing a noble gas, such as xenon, krypton, or similar gases under high pressure. Associated with lamp 1 is reflector 5. This is for focusing and directing light emitted during each cycle of operation of lamp 1 to a spot location 6 on a moving support member 7, the characteristics of which depend upon the application.

In operation, electrode 3 of lamp 1 is at ground reference point. Capacitor 8 charges through resistor 9 and is discharged through transformer 10 when the silicon-controlled rectifier 11 is triggered. Transformer 10 has proper turns ratio to provide approximately a 20KV pulse at electrode 4 of lamp 1 through capacitor
13. The resulting small spark ionizes lamp 1, allowing capacitor 14, previously charged to 1500 volts through resistor 15, to discharge through lamp 1, producing a bright flash of light. Capacitor 14, typically.01 micron fd., provides 11 millijoules of electrical energy per flash.

Lamp 1 is of the variety commonly designed for continuous arc duty. Using this lamp in cold-pulsed mode provides ignition and complete extinction of the conduction path within the lamp with each pulse....