Mitsui Petrochemical Industries, Ltd.

Miyachi Technos Corporation

Seigoh Murakami

Mitsugu Terada

Takahiro Uchida

Minoru Kojima

Hiroyuki Okuyama

A laser output unit according to the present invention comprises a body having a laser output port at an extreme and thereof, lenses provided within said body to condense laser beam introduced to emit it from the laser output port, and a protective glass provided between said laser output port and said lens within said body. A gas jet port and a gas exhaust port opposed to said gas jet port are provided at said body portion between said protective glass and said laser output port. A gas crosses at a position between the protective glass and the laser output port. Flying matter is blown away by the gas and does not arrive at the protective glass.

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Sodegaura, Japan

Seigoh Murakami