Title:
COLOR CATHODE-RAY TUBE
Document Type and Number:
WIPO Patent Application WO/1998/043272
Kind Code:
A1
Abstract:
A cathode-ray tube that has an electron gun comprising a last-stage main lens made up of a last accelerating electrode (6) and the focusing electrode (5) and having a focus function stronger in horizontal direction than in vertical direction, an electron lens of the first kind formed inside the focus electrode (5) and having a focus function stronger in vertical direction than in horizontal direction to vary the cross sectional shape of an electron beam with an increase of the deflection amount, an electron lens of the second kind formed inside the focus electrode (5) for weakening the lens strength with an increase of the deflection amount of an electron beam, and an electron lens of the third kind made up of at least one electrode constituting a three electrode section and having a focus function stronger in horizontal direction than in vertical direction. The dynamic focus voltage which decreases with an increasing deflection amount is reduced. The horizontal diameter of an electron beam spot is reduced on the central area of the screen.
Inventors:
NOGUCHI KAZUNARI (JP)
SHIRAI SHOJI (JP)
INOUE YUICHI (JP)
SHIRAI SHOJI (JP)
INOUE YUICHI (JP)
Application Number:
PCT/JP1997/001009
Publication Date:
October 01, 1998
Filing Date:
March 26, 1997
Export Citation:
Assignee:
HITACHI LTD (JP)
NOGUCHI KAZUNARI (JP)
SHIRAI SHOJI (JP)
INOUE YUICHI (JP)
NOGUCHI KAZUNARI (JP)
SHIRAI SHOJI (JP)
INOUE YUICHI (JP)
International Classes:
H01J29/50; (IPC1-7): H01J29/50
Foreign References:
| JPH07161309A | 1995-06-23 | |||
| JPH08129967A | 1996-05-21 | |||
| JPH0721936A | 1995-01-24 |
Attorney, Agent or Firm:
Ogawa, Katsuo (5-1, Marunouchi 1-chom, Chiyoda-ku Tokyo 100, JP)
Download PDF:
Previous Patent: PLASMA DISPLAY
Next Patent: A LARGE TELEVISION DISPLAY SCREEN WITHOUT BUTTING PART AND MANUFACTURING THE SAME
Next Patent: A LARGE TELEVISION DISPLAY SCREEN WITHOUT BUTTING PART AND MANUFACTURING THE SAME