Matsushita Electric Industrial Co., Ltd.

Keisuke Miyoshi

Toshitaka Yukumoto

Matsuo Ochi

Naoki Shibano

Kenshiro Sumi

A translucent projection screen for a rear-type image projection system comprising a flat plate or sheet of transparent resin into which are uniformly dispersed or distributed spherical glass beads, which are light diffusing materials. Such screen as described above is fabricated by dispersing or distributing spherical glass beads into a transparent resin, extruding and cutting the resin into pellets and forming these pellets into a flat plate or sheet by compression molding. A translucent projection screen having a Fresnel lens surface and a lenticular lens surface can be also molded by one step.

Translucent projection screen for rear-type image projection system and

A projection tube projects in front a visible light image produced by irradiating a target having a fluorescent screen formed on one surface thereof with an electron beam emitted from an electron gun. The projection tube includes an X-ray shield disposed to cover the surface of the target excluding the fluorescent screen, whereby the X-ray generated by irradiating the fluorescent screen on the target with the electron beam are shielded to prevent the transmission of the X-rays to the front of the projection tube, and also the X-ray shield has the effect of dissipating the heat from the target and simplifying the target positioning operation in the manufacture of projection tubes.

Projection tube with X-ray shielding means on target

A television image projecting system for projecting a television image on a screen at a magnified scale includes a plurality of projector systems of different colors sealed in one cathode ray tube. Electron beams of the projector systems are simultaneously deflected by a common deflecting device and spherical reflecting mirrors of the projecting systems are disposed closely to each other to partially overlap each other, and the overlapped portions are removed. The plurality of projector systems are in-line arranged, whereby color-stability and color balance over a wide range are attained.

Television image projecting system

A high voltage generator comprising a high voltage generating transformer having a primary winding and first and second secondary windings, a first rectifier having one end connected to one end of the first secondary winding, a capacitor connected to the other end of the first rectifier and adapted to be charged with the voltage appearing at the other end of the first rectifier, a second rectifier connected between the connection point between said first rectifier and said capacitor and one end of the second secondary winding, and a third rectifier for high voltage rectification connected to the other end of the second secondary winding. With this construction variation of the output high voltage with change in load current can be reduced.

Growing community of inventors

Katano, Japan

Keisuke Miyoshi