Matsushita Electronics Corporation

Chisato Kurusu

Masao Natsuhara

Hiroshi Suzuki

The present invention relates to a cathode ray tube apparatus which can reduce an astigmatism caused from the deflection distortion by providing its focusing grid in two parts and producing a dynamic focusing lens of a quadrupole between the opposing faces of the two focusing grid parts. One focusing grid preferably has vertically disposed oblong through holes, while the other focusing grid preferably has one or more horizontally disposed oblong through holes.

Cathode ray tube apparatus having focusing grids with horizontally and

Distance between the second grid (G2) and the third grid (G3) is selected very short and electron beam passing apertures of the second grid (G2) and the third grid (G3) are selected small; the cathode ray tube has small beam spot both at small current and large current operations.

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Suita, Japan

Chisato Kurusu