Ushio Denki Kabushiki Kaisha

Toshiya Ukai

Yoshio Okazaki

Mitsuo Narita

Shuhei Miwata

A light source apparatus, comprises a discharge lamp and an auxiliary start-up light source provided in a base for the discharge lamp, wherein first and second external electrodes of the auxiliary start-up light source are formed on an outer face of a discharge container thereof, wherein a first lamp power feeder connected to a first external lead extending from one of the sealing portions of the discharge lamp and a first auxiliary light source power feeder connected to the first external electrode of the auxiliary start-up light source are connected to the first power supply terminal, and wherein a second lamp power feeder connected to a second external lead extending from the other sealing portion of the discharge lamp and a second auxiliary light source power feeder connected to a second external electrode of the auxiliary start-up light source are connected to the second power supply terminal.

Light source apparatus

A reflector used for a light source material of a liquid crystal video projector provides a good projection image and causes no color shading to occur in the periphery of a screen. The reflector has a surface on which a dielectric multifilm coating is deposited. The reflector reflects only visible light beams and has a wavelength .lambda..sub.1, which has a spectral transmittance on a short wave side (with normal incidence) of 20% and is equal to or smaller than 440 nm and, at the same time, has a wavelength .lambda..sub.2, which has a spectral transmittance on a long wave side (with normal incidence) of 50% and is equal to or greater than 820 nm.

Growing community of inventors

Hyogo, Japan

Toshiya Ukai