Automated neon tube evacuation and gas filling system and proces

Electric lamp or space discharge component or device manufacturi – Process – With testing or adjusting

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Details

445 6, 445 72, H01J 9395

Patent

active

053521439

ABSTRACT:
A system and method for automatically evacuating and filling neon tubing is disclosed wherein an electrical controller is provided to automatically control the evacuation and fill cycles. For this purpose, pneumatic actuator valves are utilized in the manifold system to selectively control the flow functions in the process during the evacuation and fill cycles. A bombarder signal is delivered to a bombarder unit by the controller, which generates electrical current through the electrodes of the tubing being processed to heat the tubing. A pressure gauge is placed in the manifold system to sense tube pressure and generate an electrical pressure signal which is transmitted to the electronic controller. A temperature sensor is placed in temperature sensing relation with the tubing to sense the temperature of the tubing and generate an electrical temperature signal also transmitted to the controller. As the tubing heats, the pressure is controlled by opening and closing a pump valve to automatically provide desired pressure conditions in the tubing as it is heated. When the tubing reaches a second temperature, the pump valve is opened to evacuate the tubing. At the same time, the bombarder current is automatically terminated by the controller. The tubing is evacuated until a first pressure is reached. At that time, the controller automatically closes a first pump valve and opens a diffusion pump valve to switch the evacuation process to a diffusion pump which draws down the pressure to about 1 micron or less. After the evacuation process is over, the diffusion pump is closed by the controller. When the tubing cools to a filling temperature, as sensed by the temperature sensor, the controller receives the fill temperature signal, and opens up a gas valve to back fill the tubing until a desired filling pressure is reached.

REFERENCES:
patent: 2992058 (1961-07-01), Mullan
patent: 4371224 (1983-02-01), Murphy et al.
patent: 5114372 (1992-05-01), Fuchs

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