Patent ID: 9676048
Date: 2017-06-13
CPC Classifications: B23K,F04D,H05K

Claim:
1. A vacuum soldering apparatus comprising: a chamber that is capable of soldering a work under vacuum environment; an operation part that sets a condition of evacuating the chamber; a pump that evacuates the chamber based on the condition of evacuating the chamber; and a control portion that performs an evacuation control of the pump wherein a plurality of evacuation control properties with gradients θ are previously prepared, each gradient θ corresponding to a degree of vacuum in relation to evacuation time when the chamber is evacuated by a predetermined pump output, and the control portion changes from the evacuation control property of a first pump output to the evacuation control property of a second pump output based on an initially set gradient θ in the evacuation control property, wherein the second pump output is greater than the first pump output.