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United States Patent 5,841,096
Takahashi, et. al. Nov. 24, 1998
Laser machining apparatus and method of controlling same

Abstract

A laser machining apparatus according to the present invention describes characteristics of a laser oscillator with a function including laser power, pulse frequency and duty ratio, computes a command for a power supply unit in a feed forward control section according to a command based on the function and on the power, duty ratio and frequency, computes a command for a power supply unit in the feedback control section from a power command value and a power measurement value from the power sensor, and inputs these command to the power supply unit. Also the laser machining apparatus detects changes in characteristics in the laser oscillator and corrects the function for characteristics of the laser oscillator.

Inventors: Takahashi; Teiji (Hyogo, JP); Imai; Yoshihito (Hyogo, JP); Morita; Atsushi (Hyogo, JP); Matsubara; Masato (Nagoya, JP); Nagano; Osamu (Nagoya, JP); Fukushima; Tsukasa (Nagoya, JP).
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP).
Appl. No.: 928,226
Filed: Sept. 12, 1997

Related U.S. Application Data
Division of Ser No. 429,208, Apr. 26, 1995, abandoned.

Foreign Application Priority Data
Apr. 27, 1994 [JP] 6-089919
Apr. 30, 1994 [JP] 6-114558
Oct. 19, 1994 [JP] 6-253624
Apr. 18, 1995 [JP] 7-92137
Intl. Cl. : B23K 26/00
Current U.S. Cl.: 219/121.62; 219/121.6; 219/121.67; 364/474.08
Field of Search: 219/121.6, 121.61, 121.62, 121.67, 121.83; 364/474.08; 372/25, 29, 31, 38
References Cited | [Referenced By]
U.S. Patent Documents
3,806,829Apr., 1974Duston et al. 219/121.61
4,545,018Oct., 1985Clements et al. 219/121.61
4,780,590Oct., 1988Griner et al. 219/121.61
4,856,012Aug., 1989Takenaka 372/38
5,059,760Oct., 1991Iehisa et al. 219/121.62
5,065,329Nov., 1991Yamazaki et al. 364/474.08
5,081,635Jan., 1992Wakabayashi et al.
5,091,914Feb., 1992Maeda et al. 372/34
5,142,543Aug., 1992Wakabayashi et al.
5,408,482Apr., 1995Nagano et al. 372/31
5,499,257Mar., 1996Nagano et al. 372/31

Foreign Patent Documents
0328656Aug., 1989EP
61-209790Sept., 1986JP
62-104087May, 1987JP
62-104088May, 1987JP
2-143481Jun., 1990JP
3-124086May, 1991JP
Other References

Patent Abstract of Japan, JPA No. 63-239502, Oct. 5, 1988.

Patent Abstract of Japan, JPA No. 64-48101, Feb. 22, 1989.

Patent Abstract of Japan, JPA No. 64-44501, Feb. 16, 1989.

Patent Abstract of Japan, JPA No. 63-101902, May 6, 1988.

Patent Abstract of Japan, JPA No. 61-21505, Jan. 30, 1986.

Patent Abstract of Japan, JPA No. 2-22702, Jan. 25, 1990.


Primary Examiner: Mills; Gregory L.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
4 Claims, 75 Drawing Figures
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