Patent ID: 6301436
Filing Date: 2001-10-09
Classification: B23K

Abstract:
A photothermic desoldering unit, comprising a console on which a switch and a temperature control knob are provided, and an open-topped working frame mounted on a top of said console, the open-topped working frame having a top edge;said photothermic desoldering unit being characterized in that said working frame includes an internal light source and a reflective aluminum plate horizontally fixed at a location within the working frame spaced from the top edge of said working frame to close an open top of said working frame and reflect light emitted from said light source;said aluminum plate being provided at an inner side with temperature sensors to sense a surface temperature of said aluminum plate, said switch controlling power supply to said console and accordingly said internal light source, and said temperature control knob controlling a luminance of said internal light source;whereby when a surface temperature of said aluminum plate sensed by said temperature sensors is the same as a temperature value set through said temperature control knob, power supply to said light source is disconnected;and support means for supporting a circuit board at a predetermined distance from the aluminum plate so that the circuit board is out of contact with the aluminum plate.