Patent ID: 8334478

Claim:
A laser type soldering apparatus which has a laser oscillator outputting a laser beam and a plurality of optical lenses converting the laser beam output from the laser oscillator to a laser beam having a required diameter and shape to perform soldering by projecting the laser beam through the optical lenses on a to-be-soldered object, wherein one of the optical lenses is a conical lens, the conical lens has a planar incident surface and an emitting surface with a convex conical surface, and a central portion thereof has a central hole having a diameter smaller than that of a circular laser beam that is incident to the conical lens, and the conical lens is disposed such that the emitting surface having the conical surface faces the to-be-soldered object at a position where the conical lens among a sequence of a plurality of optical lenses is closest to the to-be-soldered object, and the conical lens converts the circular laser beam to a double circular beam having a ring portion with a circular ring shape and a spot portion located at a center of the ring portion so that the double circular beam is projected on the to-be-soldered object.