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Fixture for Resistance Heater Vaporizer

IP.com Disclosure Number: IPCOM000091535D
Original Publication Date: 1968-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Beavan, LA: AUTHOR [+3]

Abstract

This vaporizer mounting fixture provides large values of DC to a resistance evaporator to vaporize metals with the following advantages. The high temperatures of the vaporizer are confined inside the fixture. The fixture highly attenuates the magnetic fields produced by the evaporator current. The mounting has an expansion compensation joint to maintain a relatively fixed position of the vaporizer over a large range of temperatures. The arrangement achieves collimation of the evaporated metal.

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Fixture for Resistance Heater Vaporizer

This vaporizer mounting fixture provides large values of DC to a resistance evaporator to vaporize metals with the following advantages. The high temperatures of the vaporizer are confined inside the fixture. The fixture highly attenuates the magnetic fields produced by the evaporator current. The mounting has an expansion compensation joint to maintain a relatively fixed position of the vaporizer over a large range of temperatures. The arrangement achieves collimation of the evaporated metal.

DC is passed to vaporizer A through nonmagnetic conducting cup 1, first rod assembly 3 and 4, and second rod assembly 5 and 6 which connect to current leads 7. Vaporizer A heats up spewing metal vapors through holes provided in tantalum radiation shield 8, conducting cup 1, and outer cup 9. These holes collimate the vapor stream. Shutter 10, actuated by solenoid 11, controllably blocks the hole in cup 9 effectively turning the vapor stream on and off. Cup 1 creates a coaxial effect in the area above insulating and support base 12, greatly reducing the magnetic fields produced. Cup 1 is attached to three rods 13, spaced at 120 degree intervals, which make contact with high current connections 14. The spacing of rods 13 provides a semicoaxial shielding effect.

As vaporizer A and rod assembly 3 and 4 expand with the heat, cup 1 and rods 13 are forced to rise against springs 15 on each rod.

Springs 15 allow rods 13 to move upward inside guides 16. The spring compression maintains a constant downward pull which results in a suitable contact pressure on vaporizer A. Expansion collar 7, attached at the top of base 12, expands downward while conduc...