发明名称 |
Cathode-ray tube device |
摘要 |
An auxiliary grid which is formed with one or more elongated slits through which pass electron beams is disposed in a prefocusing system in a cathode-ray tube, and a dynamic voltage which varies in level with increase in horizontal deflection angle is applied to the auxiliary grid so that axial asymmetry of the prefocusing system can be increased with increase in the horizontal deflection angle. As a consequence, the beam spot can be maintained substantially in the form of a true circle not only at the center of the screen but also at the portions adjacent to the peripheries thereof. Thus, the resolution at the portions adjacent to the peripheries of the screen can be improved and consequently high-quality images can be represented over the whole surface of the screen.
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申请公布号 |
US4473775(A) |
申请公布日期 |
1984.09.25 |
申请号 |
US19810298993 |
申请日期 |
1981.09.03 |
申请人 |
MATSUSHITA ELECTRONICS CORPORATION |
发明人 |
HOSOKOSHI, KAKUICHIRO;ASHIZAKI, SHIGEYA;SUGAWARA, KOICHI;NATSUHARA, MASAO |
分类号 |
H01J29/48;H01J29/50;H01J29/56;(IPC1-7):H01J29/46 |
主分类号 |
H01J29/48 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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