Toshiba Lighting & Technology Corporation

Kouichi Honda

Kiyoshi Nishimura

Yuichiro Takahara

Masuo Shibuya

The invention provides a projection device comprising a screen constituted in a layered structure with a light-transmissive screen panel and a light-transmissive reinforcing panel, wherein a front panel in the screen has a plane wider than residual panels on the back of the screen, an image projector for projecting an image on the screen, a screen frame fit on the peripheral edges of the residual back panels with a plane smaller than the front panel, a double-side adhesive tape inserted between residual back panels and the screen frame for uniting them together, a single-side adhesive tape applied across the peripheral edges of the front panel and the screen frame for uniting them together, and a housing for accommodating therein the image projector and for holding at its opening the screen via the screen frame so as that the front panel of the screen exposes outside.

Projection device and large-screen display apparatus using the same

An internal electrode ( ) is formed on the inner wall surface of a tube-shaped light emitting body ( ) along the longitudinal direction of the light emitting tube ( ). An external electrode ( ) is formed on the exterior surface of the light emitting tube ( ) along the longitudinal direction of the light emitting tube ( ). An electric discharge starts between the internal electrode ( ) and the external electrode ( ) by applying a high-frequency voltage therebetween. Only one tube wall of the light emitting tube ( ) lies between the internal electrode ( ) and the external electrode ( ), and the internal electrode ( ) and the external electrode ( ) can be brought close to each other. The limitation of an electric current running between the internal electrode ( ) and the external electrode ( ) can be reduced, and a starting voltage or a discharge-maintaining voltage can be lowered. In addition, the internal electrode ( ) can be easily processed with high accuracy.

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Kanagawa-ken, Japan

Kouichi Honda