Structure of laser module

Claim 1

A laser module of the type comprising: a hollow, cylindrical casing having a tapered laser beam emitting hole at one end made gradually bigger toward the outside, a lens holder coupling portion at an opposite end, a lens coupling portion communicated between said tapered laser beam emitting hole and said lens holder coupling portion; a cushion ring mounted in said lens coupling portion; a lens holder having one end fitted into said lens holder coupling portion and an opposite end made with an inner thread; a lens mounted in said lens coupling portion and retained between said cushion ring and said lens holder; a control circuit board; a laser diode chip controlled by said control circuit to emit a laser beam out of said tapered laser beam emitting hole of said casing through said lens; a photo detector controlled by said control circuit board to detect the intensity of the laser beam of said laser diode chip; and a control circuit holder means coupled to said lens holder to hold said control circuit board; wherein said control circuit holder means comprises a focus adjustment socket having an outer thread at one end threaded into the inner thread of said lens holder and a coupling portion at an opposite end, and a locating cap fastened to the coupling portion of said focus adjustment socket to hold said control circuit board inside said focus adjustment socket; said laser diode chip and said photo detector are mounted on said control circuit board and disposed inside said focus adjustment socket; said laser diode chip having a front end protruding over a front side of said control circuit board.