CN1231496A

CN1231496A - High brightness and resolution double-beam electron gun for projection tube

Info

Publication number: CN1231496A
Application number: CN 99105544
Authority: CN
Inventors: 朱锦林; 肖顺禄; 林岱恩
Original assignee: ZHENMEI AUDIO AND VIDEO TECHNOLOGIES Co Ltd BEIJING
Current assignee: ZHENMEI AUDIO AND VIDEO TECHNOLOGIES Co Ltd BEIJING
Priority date: 1999-04-14
Filing date: 1999-04-14
Publication date: 1999-10-13
Anticipated expiration: 2019-04-14
Also published as: CN1110062C

Abstract

The high-intensity high-resolution double-beam electron gun for projection tube is mainly characterized by that a double-modulating electrode is set after shared single cathode to form a group of cathode lenses, and a correcting electrode is set between the accelerating electrode and first anode so as to form the combined lens of prefocusing lens and refracting prisms. The dual electronic beams share a main lens formed from first anode, focusing electrode and anode, so that it can keep smaller spacing of objective points and deflection astigmation, and can obtain high intensity and high resolution.

Description

Projection tube high brightness, high-resolution double-beam electron gun

The invention belongs to the electric vacuum display device field, specially refer to the high brightness that projection tube uses, the use of high-resolution double-beam electron gun.

The picture tube that is used for the high definition projection TV set, hereinafter referred to as projection tube, the color picture tube more used than general general television set has higher brightness and resolution, but in same device, relation between high brightness and the high-resolution is conflicting, improve the brightness meeting and reduce resolution, when improving resolution, brightness will reduce again, institute represents each electrode of used electron gun and homogeneous tube structure chart in the projection tube to Fig. 1, and Fig. 2 represents the line value (directly shadow brightness) of the projection tube electron gun of four kinds of structures and the relation between the spot definition (directly influencing resolution); As can be known, line is big, and spot diameter is big, and promptly resolution reduces.Follow in order to overcome this lance, people are in being engaged in the research of colorful visualization tube electron gun, once, put forward multiple scheme, wherein a kind of is exactly the electron beam in the electron gun to be annotated by single beam electrons change into two-beam or multi beam notes, the electron gun of this scheme has enough current values, and the bright spot size of line on phosphor screen also is controlled at less numerical value, this multi beam electron gun that is used for colored picture tube has appeared in the newspapers and has led, United States Patent (USP) " the multi electron beam electron gun that is used for color picture tube " US NO5 wherein, 350,978, this is two-beam and tri-barrel electron gun that a kind of yi word pattern is arranged, see Fig. 3, the scan mode that it adopts is also column scan, be characterized in that two-beam or three beams are parallel to each other, be difficult to realize with a shared optical lens, and its line is generally less than 500 μ A, only be suitable for general color picture tube, for projection tube, for brightness and the resolution that improves projection tube, adopt the electron-optical system of custom-designed two-beam commons large cylinder, produce the two-beam or the multibeam electron that intersect and annotate, improve the brightness of bundle spot on the screen exponentially, and obtain little beam spot size.

Purpose of the present invention, be in order to overcome the image brightness that in projection TV, improves projection tube and to improve existing contradiction between the resolution, being the minimizing aberration again simultaneously, and designing a kind of two-beam or multi beam electron gun, make projection tube can obtain high brightness, high-resolution excellent image quality performance simultaneously.

The present invention relies on following technical proposals to realize, a kind of projection tube high brightness, high-resolution double-beam electron gun, arrange routinely successively by cathode assembly, Wehnelt electrode, the gathering utmost point, anode, it is characterized in that, after shared single negative electrode, a double modulation utmost point G1 is set, constitutes one group of cathode lens; Between intensifying ring G2 and first anode anode G3, correcting electrode G2 ' is set, forms the compound lens of prefocus lens and refracting prisms; The shared main lens of forming by first anode G3, focusing electrode G4 and anode G5 of twin-cathode ray beam; Regulate each electrode potential, make electron beam in rifle, intersect at regulation a bit, according to the accent current potential, this point can be adjusted near the deflection center, formation Hi-BPF electron gun structure; Also can be adjusted near the saddle point of UPF field, constitute the Hi-UPF electron gun structure.

Set double modulation utmost point G1 is the electrode slice of two semicircles, along both sides, diameter center, respectively has the aperture that a line passes through, shown in Fig. 5 b; Set correction utmost point G1 ' is for the center has the aperture that two lines arranged side by side pass through, shown in Fig. 5 c.

Double-beam electron gun according to this programme constitutes owing to add refracting prisms in the electron-optical system, has reduced the object point spacing, thereby has reduced the deflection aberration that electronics is annotated, and has improved resolution, and this rifle in use can adopt two kinds of scan modes.

Major advantage of the present invention is, this double-beam electron gun can make two beam electrons annotate as using in a projection tube simultaneously, also can use simultaneously as two single beam tubes respectively or use in turn, thereby improved useful life exponentially, high line value can be provided again, thereby this double-beam electron gun solved that the lance between high brightness, the high-resolution follows relation in the common projection tube, below its performance and common tube done one relatively:

The cast brightness spot-size resolution beam electronic current negative electrode load fluorescent screen glazing point load life-span
	Common single beam tube A ₀???D ₀??????K ₀????I ₀????JK ₀??????????P ₀???????T ₀
Two-beam tube A ₀???D ₀/2????2K ₀???I ₀????JK ₀/2????????P ₀/2??2T ₀Above 2A ₀???D ₀???????K ₀??2I ₀????JK ₀??????????P ₀???????T ₀

Simultaneously, this double-beam electron gun can make projection tube image four corner resolutions improve non-jitter, flicker free; The application mode of this double-beam electron gun can be selected two-beam scan mode arranged side by side and the two-beam order horizontal sweep mode of going together for use.

Further specify embodiment below in conjunction with accompanying drawing:

Description of drawings:

Fig. 1 is each electrode of used electron gun and a homogeneous tube structure chart in the projection tube;

Fig. 2 is for concerning between the line of common several projection tube structure electron guns and the spot definition;

Fig. 3 is the tri-barrel electron gun that yi word pattern is arranged in the general color picture tube;

Fig. 4 is an electron-optical system schematic diagram in the double-beam electron gun;

Fig. 5 a is a two-beam Hi-UPF electron gun structure schematic diagram;

Fig. 5 b is a G1 Wehnelt electrode shape in the electron gun;

Fig. 5 c is a G1 ' correction utmost point shape in the electron gun;

Fig. 6 is the effect that refracting prisms reduce the equivalent dot spacing in the double speed electron gun optical system

Fig. 7 is pack into homogeneous tube structure in the projection tube of two-beam Hi-UPF electron gun;

Fig. 8 is the two-beam Hi-BPF electron gun homogeneous tube structure in the projection tube of packing into.

The foundation cathode assembly K of projection tube electron gun wherein, label is 1, centrally assembling G1 modulator electrode 2 along axle, G2 accelerating electrode 3, G2 ' correcting electrode 3 ', the G3 first anode 4, G4 focusing electrode 5, it is an end among 6 the anode G5 that the bore of focusing electrode has extend into label, the other end of G5 is connecting anode top board 7 and getter assembly 8, this assembly is comprising getter and is propping up tube 8.1 and getter 8.2, whole electron gun and glass bulb sealing-in, anode G5 contacts with the interior graphite linings 10 of glass bulb neck by spring leaf and is connected to glass bulb cone place and contacts with anode cap 14, and glass bulb inwall coated continuously graphite linings 10, glass awl flange is 11, cone-shaped glass shell with bore junction between the end phosphor screen 13 and be provided with that glass bulb is explosion-proof is with 12.

In an embodiment, adopted the Hi-UPF electron gun structure, by this double-beam electron gun experiment, can compare, when electron beam current is constant, promptly keep brightness constant, the resolution of two-beam rifle doubles, and when requiring projection tube resolution constant, electron gun electron beam flow is that brightness improves nearly one times.

Claims

1, a kind of projection tube is arranged by cathode assembly, Wehnelt electrode, the gathering utmost point, anode successively routinely with high brightness, high-resolution double-beam electron gun, it is characterized in that, after shared single negative electrode, a double modulation utmost point G1 is set, and constitutes one group of cathode lens; Between intensifying ring G2 and first anode anode G3, correcting electrode G2 ' is set, forms the compound lens of prefocus lens and refracting prisms; The shared main lens of forming by first anode G3, focusing electrode G4 and anode G5 of twin-cathode ray beam; Regulate each electrode potential, make electron beam in rifle, intersect at regulation a bit, according to the accent current potential, this point can be adjusted near the deflection center, formation Hi-BPF electron gun structure; Also can be adjusted near the saddle point of UPF field, constitute the Hi-UPF electron gun structure.

2, according to the described double-beam electron gun of claim 1, it is characterized in that, double modulation utmost point G1 set in the rifle is the electrode slice of two semicircles, along both sides, diameter center, respectively have the aperture that a line passes through, set correction utmost point G1 ' is for the center has the aperture that two lines arranged side by side pass through.

According to the described double-beam electron gun of claim 1, it is characterized in that 3, this rifle in use can be selected two-beam scan mode arranged side by side and the two-beam order horizontal sweep mode of going together for use.