Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Kouhei Gamada

Kazunori Ohta

Masayuki Suizu

Shuji Tamaru

A projector includes a plurality of light sources; a controller which controls dimming of the plurality of light sources individually; a light modulator which synthesizes light emitted from each of the plurality of light sources to generate synthetic light, and modulates the synthetic light to generate an optical image; and a projecting optical system which projects the optical image generated by the light modulator. The plurality of light sources include a first light source and a second light source, and when the controller causes the plurality of light sources to emit dimmed light, the controller causes the first light source to emit light with supplied power greater than or equal to 50% of rated power and causes the second light source to emit light with supplied power less than 50% of the rated power or turn off.

Projector with a plurality of light sources having dimming capabilities

The present invention aims to provide a small-sized high-efficiency high pressure discharge lamp that exhibits favorable light intensity distribution properties and is less likely to cause breakage of an arc tube. The present invention is a high pressure discharge lampcomprising: an arc tubethat includes; a light-emitting parthaving a substantially spherical shape and having mercury enclosed therein; and a pair of sealing partsextending from opposite sides of the light-emitting part; and a pair of electrodesthat are arranged in the arc tubesuch that an end of each electrode is sealed by a respective sealing part and the other ends of the electrodes oppose each other in the light-emitting part. The enclosed mercury has a density of 0.2 to 0.4 [mg/mm] inclusive. A distance W from a contact point S to a center O is 3.0 to 5.0 [mm] inclusive. A distance Cfrom a contact point Tto the center O is 1.5 to 3.0 [mm] inclusive. The distance Cand a distance Csatisfy a relation C/C&#x2267;0.8, and a minimum thickness X [mm] and a maximum outer diameter D [mm] satisfy a relation X/D&#x2267;0.2.

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Osaka, Japan

Kouhei Gamada