CN2524367Y - Electronic gun for projection tube with high resolution - Google Patents

Abstract

The utility model relates to an electronic gun for projection tube with high resolution which simulates the size and interval of each grid confirmed by experiment through electric contrail. The utility model comprises a modulation electrode G1, and an acceleration grid G2, a pre-focusing electrode cylinder G3 and a focusing electrode cylinder G4 which are orderly and longitudinally arrayed, as well as an anode cylinder G5 which is surrounded at the outer side of the G4. The electronic gun can get electronic beams with smallest radiation angles under big current work state so that the projection tube assembled by the electronic gun has the excellent performance of high brightness and high definition.

Description

A kind of high-resolution projection tube electron gun

The utility model belongs to the electric vacuum display device field, specially refers to a kind of electron gun parts that is used for the high-resolution projection tube.

Projection tube is the core components and parts of large-curtain projecting TV set, seek out the projection TV effect of high brightness, high definition high-quality picture, one of its key technology is indexs such as the resolution that is to improve projection tube, brightness, and electron gun is one of the parts of the most critical of decision projection tube performance quality, this patent promptly is that the electron gun that centers on a kind of low astigmatism of projection tube is optimized design, the performance of this electron gun determines the principal element of definition (resolution), brightness and the contrast of projection tube and even whole projection TV exactly.This patent has adopted the design people's the patent in first to file " 99207795.8 ", a kind of heavy caliber electron gun structure that is used for projection tube, utilize the electron optics special-purpose software to carry out optimal design between each pole piece of whole electron gun, adjust the best fit between the length of the diaphragm thickness at each electrode slice center bore place and main lens, even if seek a kind of under the situation that increases beam electronic current, also can obtain the pencil electron-baem spot that the desirable angle of divergence forms at phosphor screen, obtain high-resolution performance under the high brightness to be desirably in.

The purpose of this utility model is in order to overcome in the prior art along with electron beam current strengthens the defective of electron gun resolution with regard to descend thereupon, and redesign a kind of electron gun, make electron beam under the exemplary operation state, existing enough big beam electronic current has high-resolution performance again.

The utility model relies on following technical proposals to realize, a kind of high-resolution projection tube electron gun, comprise electron gun stem stem, cathode heater assembly, each grid and anode, it is characterized in that, this rifle grid includes Wehnelt electrode G1, vertically is arranged with accelerating grid electrode G2, prefocus utmost point tube G3, focusing electrode tube G4 and be centered around the anode tube G5 in the G4 outside successively, is welded with the spring spacer in this peripheral upper end.

Described accelerating grid electrode G2, its shape can adopt the bowl structure that has central through hole, also can adopt slice structure.

Described focusing electrode G4 is made of two parts of different-diameter, and the lower part diameter is identical with the barrel dliameter of prefocus utmost point G3, and the top diameter is the heavy caliber part that extend into anode tube inside.

Good effect of the present utility model, be that this electron gun can make electron gun obtain to have the pencil electron beam of the well focussed of minimum divergence angle under big current work voltage status, thereby also have high-resolution good characteristic under the line greatly with the projection tube of this electron gun assembling.

Further specify embodiment below in conjunction with accompanying drawing:

Description of drawings:

Fig. 1 is the high resolution electron gun general assembly schematic diagram that is used for projection tube;

Fig. 2 is the schematic diagram of the electron gun focusing utmost point.

Among the figure, 1 is standard-sized octal glass stem, on it, shelving the cathode assembly 2 that comprises filament, assembling G1 modulation grid 3, G2 intensifying ring 4, the G3 prefocus utmost point 5 and G4 focusing electrode above the negative electrode successively, its underpart is 6, and top is divided into 7, and they stretch into the inside of anode tube 8, anode tube outside is welded with spring spacer 9, and every rifle can be with 3 or 4 spacers.The size range of this electron gun the best is, the material thickness of the central hole of G2 is 0.5 ± 0.05mm, and the lower part length of G4 focusing electrode is 45.0-47.0mm, and top length is 8.0-15.0mm.

Claims (3)

1, a kind of high-resolution projection tube electron gun, comprise electron gun stem stem, cathode heater assembly, each grid and anode, it is characterized in that, this rifle grid includes Wehnelt electrode G1, vertically is arranged with accelerating grid electrode G2, prefocus utmost point tube G3, focusing electrode tube G4 and be centered around the anode tube G5 in the G4 outside successively, is welded with the spring spacer in this peripheral upper end.

2, electron gun according to claim 1 is characterized in that, described accelerating grid electrode G1, and its shape can adopt the bowl structure of central through hole, also can adopt slice structure, also can adopt slice structure.

3, electron gun according to claim 1 is characterized in that, described focusing electrode tube G4 is made of two parts of different-diameter, and the lower part diameter is identical with the barrel dliameter of prefocus utmost point G3, and the top diameter is the heavy caliber part that is deep into anode tube inside.