Title:
CATHODE-RAY TUBE
Document Type and Number:
WIPO Patent Application WO/1999/046794
Kind Code:
A1
Abstract:
An electron gun of a cathode-ray tube has a main electron lens portion comprising at least four electrodes, i.e., first, second, third, and fourth grids (5, 6, 7, 8) arranged in this order. An intermediate-level first voltage is applied to the first grid (5), and an anode voltage is applied to the fourth grid (8). The mutually adjacent second and third grids (6, 7) are interconnected through a resistor (100). Substantially the same second and third voltages higher than the intermediate-level first voltage and lower than the anode voltage are applied to the second and third grids (6, 7), respectively. An asymmetrical lens is provided between the second and third grids (6, 7). A voltage varying synchronously with a deflection magnetic field is applied to the first grid (5). Lateral crushing of the electron beam caused in the peripheral part of the screen because of the difference between the lens magnifications in the horizontal and vertical directions hardly occurs, and good picture characteristics are imparted to the whole screen of the cathode-ray tube.
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Inventors:
KIMIYA JUNICHI (JP)
AWANO TAKASHI (JP)
SUGAWARA SHIGERU (JP)
AWANO TAKASHI (JP)
SUGAWARA SHIGERU (JP)
Application Number:
PCT/JP1999/001219
Publication Date:
September 16, 1999
Filing Date:
March 12, 1999
Export Citation:
Assignee:
TOSHIBA KK (JP)
KIMIYA JUNICHI (JP)
AWANO TAKASHI (JP)
SUGAWARA SHIGERU (JP)
KIMIYA JUNICHI (JP)
AWANO TAKASHI (JP)
SUGAWARA SHIGERU (JP)
International Classes:
H01J29/50; (IPC1-7): H01J29/50
Foreign References:
| JPH04147545A | 1992-05-21 | |||
| JPH07220648A | 1995-08-18 | |||
| JPH06223738A | 1994-08-12 | |||
| JPH10162752A | 1998-06-19 | |||
| JPH10172465A | 1998-06-26 | |||
| JPH11120934A | 1999-04-30 |
Other References:
See also references of EP 0996140A4
Attorney, Agent or Firm:
Suzuye, Takehiko (Kasumigaseki 3-chome Chiyoda-ku Tokyo, JP)
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