Mitsubishi Heavy Industries Limited

Denso Corporation

Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.

Ryu Suzuki

Takashi Ishide

Saneyuki Goya

Toshiya Watanabe

Yoshihito Fujita

Makoto Yamasaki

Tsugumaru Yamashita

Kohei Kanaoka

Akimitsu Sugiura

Kenji Kanehara

Minoru Danno

Akihiro Yuuki

Masato Kinouchi

Nobuyuki Taguchi

Tomohiro Noguchi

Naoki Kido

Minoru Ichihara

In a laser ignition device which is mounted in an internal combustion engine and at least includes a laser spark plug equipped with an optical window which protects an optical device from high temperature and high pressure generated in a combustion chamber and a prechamber cap equipped with a cylindrical prechamber, a prechamber throat portion that is a bottomed cylinder with a sectional area smaller than that of the prechamber, and a plurality of prechamber spray holes which communicate with a combustion chamber on a side of a closed end of the prechamber throat portion, the prechamber cap is arranged between the optical window and the combustion chamber. A converging point FP is located inside the prechamber to ignite an air-fuel mixture delivered into the prechamber, thereby jetting combustion flames from the prechamber into the combustion chamber to fire the internal combustion engine. The center axis AXof the prechamber is oriented horizontally eccentrically from the center axis AXof the prechamber throat portion.

Laser ignition device

A processing apparatus and a processing method which perform processing more accurately with a simple structure are provided. The processing apparatus includes an irradiation headand a control device. The irradiation headincludes a laser turning unitand a condensing optical system. The laser turning unitincludes a first prism, a second prism, a first rotating mechanism, and a second rotating mechanism. The control device adjusts the differences between rotation speeds and phase angles of the first prismand the second prismbased on a relation between at least a heat affected layer of a workpiece and a turning speed of laser.

Processing apparatus and processing method

Provided are a machining device and a machining method in which machining of higher precision can be performed with a simple configuration. The machining device has an irradiation head () and a controller; and the irradiation head () can be divided into a collimate optical system, a laser revolving unit (), and a light collection optical system (). The laser revolving unit () has a first prism (), a second prism (), a first rotation mechanism (), and a second rotation mechanism (). The controller controls the rotational speeds and the difference in phase angles of the first prism () and the second prism (), on the basis of at least the relationship between a heat affected layer of a member to be machined and the revolving speed of the laser.

Machining device and machining method

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Tokyo, Japan

Ryu Suzuki