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Cathode-ray tube apparatus

A technology for cathode ray tubes and tube shafts, applied in the direction of cathode ray tubes/electron beam tubes, electrode devices and related components, discharge tubes, etc., can solve problems such as impossibility and unevenness

Inactive Publication Date: 2005-09-07
MATSUSHITA TOSHIBA PICTURE DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the magnetic field generated by the magnetic ring of the CPU becomes uneven due to the influence of the ferromagnet placed inside the magnetic ring, and it is impossible to sufficiently obtain the effect of correcting the convergence by the CPU

Method used

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Embodiment Construction

[0019] According to the first and second cathode ray tube devices of the present invention, a spacer made of a magnetic body is placed between the magnetic rings of the CPU. Therefore, the magnetic flux density of the speed modulation coil can be increased, and the speed modulation sensitivity can be enhanced without disturbing the magnetic field of the magnetic ring of the CPU and without increasing the number of components. Thus, image quality can be significantly improved. Furthermore, the spacer made of a magnetic body does not affect the operation of correcting the degree of convergence performed by adjusting the rotation phase of the magnetic ring, so that a satisfactory degree of convergence is easily obtained with the magnetic ring.

[0020] Furthermore, in the first cathode ray tube device, at least one spacer is made of only one kind of magnetic body, so the spacer can be manufactured at low cost.

[0021] Furthermore, in the second cathode ray tube device, a non-me...

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Abstract

A plurality of magnet rings (13A, 13B, 14, 15) for correcting a convergence are arranged in a tube axis direction with spacers (16, 17, 18) interposed therebetween, on an outer circumferential surface of a neck (3). A velocity modulation coil (19) for modulating a scanning velocity in a horizontal direction of an electron beam is placed so that a position of the velocity modulation coil (19) in the tube axis direction is overlapped with those of the magnet rings (13A, 13B, 14, 15). At least one of the spacers (16, 17, 18) is made of only a magnetic substance. Alternatively, at least one of the spacers (16, 17, 18) is made of a magnetic substance, and the outermost surface in a radius direction of the spacer made of a magnetic substance is covered with a non-metallic material. Because of this, the magnetic field formed by the velocity modulation coil (19) can be intensified without disturbing the magnetic field of the magnet rings (13A, 13B, 14, 15) of a CPU.

Description

field of invention [0001] The present invention relates to a cathode ray tube device. Background technique [0002] Recently, in television receivers and the like, along with the increase in size, higher demands are placed on image quality. As a method of achieving this requirement, a cathode ray tube apparatus has been proposed in which a velocity modulation coil is installed to enhance image edges to improve the sharpness of image quality. The velocity modulation coil forms a magnetic field in the vertical scanning direction of the electron beam and changes the scanning velocity in the horizontal scanning direction of the electron beam, thereby enhancing image edges (for example, see JP 57(1982)-45650U). [0003] Furthermore, Japanese JP 2003-116019A explains that a pair of ferromagnets are arranged so as to face each other on the outer peripheral surface of the neck of the funnel in such a manner that they are respectively modulated with the velocity A pair of loop coil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/34H01F3/08H01F7/02H01J29/70H01J29/76
CPCH01J29/76H01J2229/5688H01F7/0278H01J29/703
Inventor 西山耕司森本泰治佐藤明岩崎胜世谷轮贤一郎
Owner MATSUSHITA TOSHIBA PICTURE DISPLAY CO LTD
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