CN2669361Y - Getter device for projection tube electronic gun - Google Patents

Abstract

The utility model discloses a getter device for projection tube comprising a glass cone and an electronic gun. The electronic gun extends into the tube neck of the glass cone, and the top end of the anode G5 of the electronic gun is provided with a getter. The getter is connected with the anode G5 of the electronic gun through a support bracket, the length of the support bracket is increased, the support bracket is provided with an evapotranspiration cover, an inner cylinder is arranged on the evapotranspiration cover, and the inner cylinder is sheathed on the cylinder of the top end of the anode G5. The evapotranspiration cover is supported through the getter, and steam Ba in the getter in the baking process is adhered on the tube neck and the inner wall of the cone part to prevent the steam of the getter adhering on a fluorescent surface and prevent producing a film Ba to influence the brightness of a projection tube. The purpose of enlarging the adhering area of the Ba film is achieved through the three shapes of the evapotranspiration cover of the getter to prevent producing the influence to the vacuum degree at the late period and the cathode life of the projection tube. The inner cylinder structure of the evapotranspiration cover of the getter effectively prevents the film Ba evapotranspiring inversely to produce the parasitic emission after the evapotranspiration cover is added on the getter.

Description

Projection tube electron gun getter device

Technical field

The utility model relates to projection tube electron gun getter and evapotranspires, particularly projection tube electron gun getter device.

Background technology

Electron gun and glass bulb are two kinds of vitals that projection tube is produced, electron gun mainly is made up of G1 (Wehnelt electrode), G2 (intensifying ring), G3 (anode), G4 (focusing electrode), G5 (anode), negative electrode, heated filament and getter, in the projection tube production process, need electron gun be encapsulated into the projection tube glass bulb at sealing process, and glass bulb is vacuumized at deairing step, glass bulb inside is in high vacuum state, makes the electron gun can emitting electrons at vacuum state.In order to keep the high vacuum in projection tube later stage, need the agent of deairing step nonevaporable getter, the gas of releasing in the projection tube use is in time absorbed, to keep condition of high vacuum degree in the pipe by getter.

Because the getter of projection tube belongs to the neck evaporable air-absorbing agent, it is welded on the electron gun anode G5 top, and the direction of evapotranspiring is directly in the face of the glass bulb face, and with the face close together, has only 11cm, than near many of other cast, there is not shadow mask to stop again, therefore in getter evapotranspires process, high temperature evapotranspires getter, produced Ba steam, the Ba steam of part upwards has been attached to the face, has formed the Ba film.Make behind the projection tube because the influence of Ba film makes projection tube brightness descend about 8%, projection tube light-emitting phosphor decrease in efficiency, homogeneous tube brightness reduces.

The utility model content

The purpose of this utility model is to provide a kind of projection tube electron gun getter device that can effectively improve the brightness of projection tube.

The realization the technical solution adopted in the utility model is: a kind of projection tube electron gun getter device, comprise glass awl, electron gun, electron gun stretches in the neck of glass awl, the G5 anode top of electron gun is provided with getter, and getter is connected with electron gun G5 anode by support, and its improvements are, increase the length of support, support is provided with the lid that evapotranspires, and is provided with inner core evapotranspiring to cover, and inner core is enclosed within on the cylinder of G5 anode top.

Owing to be provided with the lid that evapotranspires in getter the place ahead, can reduce the roasting back Ba steam that disappears of getter at the adhesion amount of face, the roasting brightness decay that disappears front and back is dropped to below 2.5% by 8%, improved the brightness of projection tube effectively.

Description of drawings

Fig. 1 be have getter evapotranspire the lid electron gun be installed in the pipe in structural representation;

Fig. 2 the utility model evapotranspires and covers plane structure chart and vertical view; Wherein Fig. 2 (a) evapotranspires to cover plane structure chart, and Fig. 2 (b) evapotranspires to cover vertical view;

Fig. 3 the utility model evapotranspires and covers 30 ° of structure charts of perk and vertical view; Wherein Fig. 3 (a) evapotranspires to cover 30 ° of structure charts of perk, and Fig. 3 (b) evapotranspires to cover the vertical view of 30 ° of perks;

Fig. 4 the utility model corrugated is evapotranspired and is covered structure chart and vertical view; Wherein Fig. 4 (a) evapotranspires to cover wave structure figure; Fig. 4 (b) is that corrugated is evapotranspired and covered vertical view;

Fig. 5 is that the utility model lid that evapotranspires is installed in structural representation on the electron gun.

Embodiment

Below in conjunction with accompanying drawing structure of the present utility model and operation principle are described in further detail, other two kinds of structures together.

Referring to Fig. 1, Fig. 2, shown in Figure 5, the utility model comprises glass awl 5, electron gun 6, electron gun 6 stretches in the neck of glass awl 5, G5 anode 1 top of electron gun 6 is provided with getter 2, getter 2 is connected with electron gun G5 anode 1 by support 3, increases the length of support 3, and support 3 is provided with to evapotranspire and covers 4, evapotranspire and cover 4 and be provided with inner core 8, inner core 8 is enclosed within on the G5 anode 1 top cylinder 9.

Evapotranspire cover 4 and getter 2 between spacing at 1mm-5mm, evapotranspiring and covering 4 external diameter is φ 18-φ 25mm, inner core 8 diameters are φ 5-φ 10mm.

The cylinder 9 on G5 anode 1 top is nested into getter and evapotranspires and cover in the inner core 8, and keeps above overlapping of 1mm at least.

As shown in Figure 4, evapotranspire and cover 4 peripheral portions and adopt wave structure.As shown in Figure 3, evapotranspire cover 4 can be along axis both sides perk in 0-30 degree scope.

After getter evapotranspires, under 4 the effect of covering of evapotranspiring, Ba steam direction of advance is spread by original changing into towards the face to both sides, thereby makes the Ba film that produces after the Ba steam cooled attached to tube neck and glass bulb tapering inwall, has reached the effect of Ba film attached to the face that prevent.Simultaneously, the Ba film also is guaranteed at the bond area in neck and glass bulb tapering, can not have influence on the interior vacuum degree of pipe of projection tube, also just can not exert an influence in the target life-span.

As shown in Figure 4, getter evapotranspires and covers peripheral portion and can adopt wave structure, and wave structure is similar to beer bottle cap.The purpose of this structure is to make the Ba steam can be more attached to the glass bulb tapering, thereby has enlarged bond area, increases the adhesive strength of Ba film.If use planar structure, because getter 2 and evapotranspiring covers under the reference line that 4 positions all are positioned at neck, getter evapotranspires the back because 4 the effect of covering of evapotranspiring, Ba steam major part will be attached to tube neck, make the Ba membrane area of generation less, and thicker, influenced the getter gettering rate, will have influence on the later stage vacuum degree of projection tube, thereby the cathode life of projection tube is gradually given birth to influence.Adopt wave structure, effectively enlarged the Ba membrane area, overcome the shortcoming of evapotranspiring and cover in the plane.

As shown in Figure 3, evapotranspire cover 4 can be along axis A-B perk in 0-30 degree scope, evapotranspire and cover 4 C, D point perk, A, B means of spot welds are on support.The purpose of this structure is to make the Ba steam can be attached to glass bulb tapering and tube neck equally.In addition, utilize projection pipe range limit and minor face difference dimensionally, enlarged the evapotranspire area of getter in the minor face tapering, thereby enlarged Ba film bond area, principle is the same.

As shown in Figure 5, the evapotranspiring to cover of getter 2 has inner core 8 on 4, and its diameter is greater than cylinder 9 diameters on anode G5 top 1, and getter evapotranspires after lid installs, and getter evapotranspires and covers inner core 8 and will put G5 anode top cylinder 9, and guarantees more than the overlapping 1mm.So just can prevent effectively that Ba steam is counter in the roasting process that disappears evapotranspires below the G5 anode top that is diffused into electron gun, has prevented that Ba steam is attached on other part of electron gun and the generation of the parasitic emission that causes.

Exhaust is in nonevaporable getter agent process, coreless induction furnace heats getter 2, when getter 2 temperature reach 800 ℃, getter 2 self reacts, discharge a large amount of heats, make getter 2 temperature reach 1200 ℃, getter 2 produces Ba steam, Ba steam upwards runs into getter and evapotranspires and cover 4 backs and change directions, run into cold objects such as neck and tapering inwall after, become the Ba film, attached to neck and tapering inwall, thereby prevented the Ba film attached on the face 7, will reduce the Ba film and brightness be impacted attached on the face 7 time, improved the brightness of projection tube.

Claims (6)

1, a kind of projection tube electron gun getter device, comprise glass awl (5), electron gun (6), electron gun (6) stretches in the neck of glass awl (5), G5 anode (1) top of electron gun (6) is provided with getter (2), getter (2) is connected the front end of electron gun G5 anode (1) by support (3), it is characterized in that support (3) is provided with the lid (4) that evapotranspires, the lid (4) that evapotranspires is provided with inner core (8), and inner core (8) is enclosed within on G5 anode (1) the top cylinder (9).

2, projection tube electron gun getter device according to claim 1 is characterized in that, evapotranspires that spacing is at 1mm-5mm between lid (4) and the getter (2), and the external diameter of the lid (4) that evapotranspires is φ 18-φ 25mm.

3, projection tube electron gun getter device according to claim 1 is characterized in that, the cylinder (9) on G5 anode (1) top is nested into getter and evapotranspires and cover in the inner core (8), and keeps above overlapping of 1mm at least.

4, projection tube electron gun getter device according to claim 1 is characterized in that, lid (4) peripheral portion that evapotranspires adopts wave structure.

According to claim 1 or 4 described projection tube electron gun getter devices, it is characterized in that 5, the lid (4) that evapotranspires is along axis both sides perk in 0-30 degree scope.

6, projection tube electron gun getter device according to claim 1 and 2 is characterized in that, inner core (8) diameter is φ 5-φ 10mm.

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