Light beam heating apparatus

Details Light beam heating apparatus Light beam heating apparatus

1995-10-31

1998-04-14

Hoang, Tu B.

Electric resistance heating devices

Heating devices

Radiant heater

347175, 355208, 392418, 219497, 219510, F21V 700

Patent

active

057403139

ABSTRACT:
During a preheating period of a light beam heating apparatus for heating a material locally with a light beam, fans for cooling a lamp for generating a light beam are not operated. A power source supplies current to a lamp. A current detector detects the current supplied to the lamp from the power source. A delay circuit delays a current detection value from the current detector for a predetermined time period and then sends the value to a controller. Then, the controller starts to activate fans for cooling the lamp. Alternately, a temperature detector is provided to detect the temperature of the lamp. When the temperature reaches a prescribed temperature, the controller starts to activate fans for cooling the lamp. Thus, the internal temperature of the lamp reaches the thermal saturation temperature in a shorter period of time, and the optical energy for heating can be stabilized after preheating.

REFERENCES:
patent: 4283658 (1981-08-01), Parker
patent: 4518895 (1985-05-01), Lehman
patent: 4630182 (1986-12-01), Moroi et al.
patent: 4695714 (1987-09-01), Kimizuka et al.
patent: 5063284 (1991-11-01), Sunada
patent: 5150154 (1992-09-01), Kuwabara
patent: 5332869 (1994-07-01), Hagiwara
patent: 5565903 (1996-10-01), Ueda

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