Ushio Denki Kabushiki Kaisha

Kenichi Yoshida

Kazuhiro Goto

Atsushi Imamura

Light source device, including an alternating current high-pressure mercury lamp having a pair of opposed electrodes within a spherical light-emitting part containing at least 0.15 mg/mmof mercury and 10&#x3bc;mol/mmto 10&#x3bc;mol/mmof halogen, and cylindrical hermetically sealed portions extending from both ends of the light-emitting part. External leads protrude from the ends of the light-emitting part. A reflecting mirror has a concave reflecting part surrounding the light-emitting part and a cylindrical neck part. An adhesive fills a periphery one of the hermetically sealed portions in the area of the external leads in a manner fulfilling the relationship L/R&#x2267;0.5 where L(mm) is the length along the hermetically sealed portion filled with an adhesive and R (mm) is the diameter of the hermetically sealed portions. Feed wires connect to the external leads and openings for the feed wires can be formed in the reflecting part with flexible tubes between them.

Light source device

A light source device, including an alternating current high-pressure mercury lamp having a pair of electrodes opposite each other with a spherical light-emitting part having at least 0.15 mg/mmof mercury and halogen at 10&#x3bc;mol/mmto 10&#x3bc;mol/mm, and cylindrical hermetically sealed parts extending from both ends of the light-emitting part. External leads protrude from the ends of the light-emitting part for receiving alternating current. A reflecting mirror having a concave reflecting part surrounds the light-emitting part and a cylindrical neck part. An adhesive for securing the mercury lamp and the reflecting mirror fills a periphery of the hermetically sealed parts of the mercury lamp. The distance L(mm) from a center in between the electrodes to the adhesive is set at a value of one of 16 mm or less and 20 mm or greater.

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Himeji, Japan

Kenichi Yoshida