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United States Patent 6,433,304
Okumura ,   et al. August 13, 2002
Perforating machining method with laser beam

Abstract

Assuming that t1 represents a period of time until a detection signal is outputted after a sensor senses a laser beam passed through a through-hole of a workpiece, t2 represents a period of time until the detection signal derived from the sensor exceeds a preset threshold value, and t3 represents a period of time until radiation of the laser beam is actually stopped after the threshold value is exceeded, a total period of time (t1+t2+t3) of the periods of time t1 to t3 is set to be shorter than a time difference (T2-T3) between a pulse width (T3) and one cycle (T2) of a pulse signal for constructing a laser output command signal.

Inventors: Okumura; Tokuji (Hasuda, JP); Wakabayashi; Kazushiro (Utsunomiya, JP); Isogai; Kazuo (Sayama, JP); Takekuma; Hideshi (Utsunomiya, JP); Otake; Tsuneo (Sakado, JP)
Assignee: Honda Giken Kogyo Kabushiki Kaisha (Tokyo, JP)
Appl. No.: 742094
Filed: December 22, 2000
Foreign Application Priority Data
Dec 22, 1999[JP]11-365484
Dec 22, 1999[JP]11-365485

Current U.S. Class: 219/121.71
Intern'l Class: B23K 026/00; B60R 021/20
Field of Search: 219/121.6,121.61,121.62,121.7,121.71,121.83,121.85 264/400

References Cite
U.S. Patent Documents
5744776Apr., 1998Bauer.
5882572Mar., 1999Lutze et al.
Foreign Patent Documents
58-16784Jan., 1983JP.
8-282420Oct., 1996JP.
10-85966Apr., 1998JP.

Primary Examiner: Heinrich; Samuel M.
Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch, LLP
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