发明名称 |
Method and apparatus for determining beam dimensions at the screen of a shadow mask cathode-ray tube. |
摘要 |
<p>The dimensions and light output of a beam in a shadow mask cathode-ray tube are determined by means of an optical system 7 focussed on a phosphor dot to pick up and record the light generated by a ray 4 passing through a single aperture 6 in the shadow mask 2. The cathode-ray beam 1 is moved so that the whole cross-section of the beam passes the aperture 4. The detected light outputs are plotted to provide an accurate representation of the whole beam. Repeating the procedure for each gun gives a precise record of the misconvergence of the beam.</p> |
申请公布号 |
EP0030259(A1) |
申请公布日期 |
1981.06.17 |
申请号 |
EP19800106078 |
申请日期 |
1980.10.07 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
BURR, PETER;CHASE, BRIAN DAVID;PATON, ANDREW;SOWTER, BRIAN RAYMOND |
分类号 |
H04N17/04;(IPC1-7):04N9/62 |
主分类号 |
H04N17/04 |
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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