Method of manufacturing cathode-ray tube

专利摘要:
Before a CRT is tipped off following exhaustion of gases to a low pressure, at least a portion of one of the electrodes of the mount assembly (e.g., the grid electrode facing the anode) is heated to high temperatures, preferably about 700 DEG to 800 DEG C., in an atmosphere having a partial pressure of oxygen.
公开号:SU1242003A3
申请号:SU823457849
申请日:1982-07-01
公开日:1986-06-30
发明作者:Герхард Хернквист Карл
申请人:Рка Корпорейшн (Фирма)；
IPC主号:

专利说明:

one
The invention relates to the electron-Fjofi technique and can be used in the fabrication of the spin; electron beam tubes (CRT.
The aim of the invention is to improve the quality of the tube by eliminating afterglow therein.
On fz; D.1 shows part of the installation for pumping, redoing for 12120033
focusing electrode 9 (Fig.2 and 3). The assembly of fittings-8 can be any cong structure.
Installation 10 for pumping on the design of the pumping trolley. The CRT is supported in an installation of 10 ° C, part of which is shown in Fig. 1) on the support brackets 1I, which rest on the onopj yj frame 2 mounted on
the proposed method, the vertical support struts 13, is attached 1 le - g: a sectional view of FIG. 2 - assembly to the heat insulating platform 14. s; the near-frequency catulp and installation for the Ustanoik 10 includes a suction pump
pumping in position for heating 1: b of the branded parts of the reinforcement assembly;
affinity (not shown), which is connected to the compressors
licitelno at the beginning of pumping CRT; On FL.Z - the same, in the 1stLocation of CRT.
The proposed method is the implementation of the Iuschetol - IUT in a non-pushed installation, that is, pumping HjTii in a flow device, the Point-iohe device c. Contains a series of pumping out and, 1X steps, moving along a closed circuit, iv this circuit. Tunnel kiln - figurative .pho) we are located P; 1d b i.iCTb O p da teleh; ek takp - to cover the flasks and pacTiiy6 CRT, which are processed, but the legs n adjacent parts of their orloins are shells . Tunnel with zones that are heated to.-Given temperatures, tag; That dnis), e-bulb and bell cal; doy CRT, moving through the tunnel, sprays the action of the required profile pagreya. About . the input end, as well as near the output to the opts of the inner part of the tunnel P1; and the deposit is - very hourly energy of 1C. the mouth of the CRT, gossip is dispersed; outside the tunnel.
Single body, g: sa flow pumping device works like a non-dvu: pa, cyclic installation. Pumping body 1; kchch or ipodvil; ia installation (fpg.3). It may be possible to take one CRT. . ELT 1 containing a flask, including day 11; e flask 2, welded to the races. pipe 3, which has a well-worn one-piece 1P1 glass and a mouth A. The neck 4 is closed at one end of a glass; kk .5 (Fig. 2 and H), which is; m (et metal pins 6 Nolski and glass 1 ltngel 7, external 1). You.water b} 1shok also go inwards and support the armature assembly 8 (Fig. 2) of a CRT. Armature node 8 VA; There are three electrodes, each containing an indirectly heated cathode. a few after, tsovatel;: about spaced electrodes, 1,
affinity (not shown), which is connected to the compressors
five
J passing through a hole in the platform 14. The upper end of the kompression- uoii of the heads 15 is provided with a knot-; 16 pumping-out of the first time, in which he sets his lijTenrojHj / s time; n; th vacuum-density 20 HOii. Dependence. Electric ifarpe: 1 17 for welding is installed on platform 4 with the help of a heater rack 18. for brewing and Kpo.HDiTeiHia 19. llariK-.BaTOjHj 17 surrounds lUTCHrejnj 7, next to 5 and to soften and close the steeaSl 7- for zavarokavarii and: sealing the CRT after the last, pgr 1 C} P1 stage otrsachki. Node 20 coil Byso;: of the base heater.
30 is supported above platform 14 when
25
nomoi and high frequency
| a1 rewatel and bracket 22. Knot 20 of the high-frequency heater katupgki having 1 toroidal pho)) - 1y, spgtbzhen.
11, en1 is a hole with a hole, into which j can be installed the neck 4 of the CRT 1. Node 20 contains a toroidal coil 23 and the toroidal ferromagnetic part of the same shape as the torus.
24 and the upper part of Katz shki 23 in ele-troizol by cyopny, heat-resistant container1) e. As shown in FIG. 2 and 3, the container contains the bottom plate: well 25, the upper plate 26 and the distal ring. The node 20 includes a cooling coil (not shown) j H. irraeivbm circulating, cooling. (By means of a tube through a pipe 28. Coil 23 high frequency heater
on It is found for selected periods of time during the heating cycle, for heating selected metal parts of the ap: -Tray 8 assembly.
Pagrevu nodvergatsya various
Selected parts of the reinforcement assembly with high-frequency power at the beginning of the cycle and in the KOJH; e cycle. For this purpose, a means dd regulativz-3 is provided.
and the length of the rack 21 of the coil of the high-frequency heater above the platform 14 and, thereby, adjusting the position of the node 20 of the coil of the high-frequency heater relative to the neck 4.
The specified equipment works in the usual way. Installation 10 includes a heat insulating jacket 29, which can be raised and lowered onto. platform 14. In practice, the shell 29 is lifted and the CRT 1 is mounted on the support brackets 11 of the installation 10. The height of the CRT above the platform is adjusted to the exhaust channel assembly 16 is temporarily sealed with the pinge 7. Then the shell 29 is lowered, the bottom of the bulb 2 and the socket 3 are heated to ZOO-AZO C range. During the heating cycle, the internal cavity of the CRT is continuously pumped out through the shtagel 7.
At the beginning of the pumping out cycle, when the partial oxygen pressure in the flask is (1.3-3.9) U Pa, the coil assembly 20 is positioned as shown in Fig. 2 and feeds for 2 minutes from the high-frequency source approximately 1.2 kHz. This heats the upper part of the electrode 9, facing the anode, up to approximately 750 s. If the electrode 9 is made of a chromium-based alloy, the heating oxidizes the surfaces of the parts that are subjected to heating, creating a chromium oxide layer that is resistant to heating at least to. The effect of this heating is to oxidize the surface of the electrode 9, changing it from metallic gray to yellow-yellow solenoid, when it is next at room temperature. At the end of the heating cycle, the high-frequency clock 23 is positioned as shown in FIG. 3, and is powered by high-frequency energy of 1.2 kHz for 5 min. This induces eddy currents in the metal parts of the valve assembly 8., which heat the metal parts between the leg 5 and the electrode 9 to a temperature in the range from 500 to 850, depending on the heating time.
After completing the high-frequency heating cycle, the welding heater 17 is turned on to heat a small area of the pinge 7 for 42003
The glass is softened, which due to the atmospheric pressure, is deposited and sealed, sealing the internal part of CRT I from the external medium. The CRT .1 is cooled and excess part of the shingnel 7 is broken off. The sheath 29 is then raised and the CRT is released and removed from the installation. The base (not shown) is then attached to the legs 6 of the legs, the getter (not shown) in the CRT ignites and the assembly 8 is subjected to an electrode treatment program, including activation of the cathode, electrical
5 aging and puncturing.
High-frequency heating in the channel of the heating cycle is used to oxidize the upper part of electrode 9. This process (heating part of electrode 9) in the initial stages of pumping, when the partial pressure of oxygen is (1.3-3.9) -10 Pa, reduces the percentage of oxygen. CRTs that have an afterglow. This heating process creates a thin layer of metal oxide on parts of the valve assembly that can be sources of electrons.
The upper part of the electrode 9 | fo6pa0 schenna to ab ode), heat up for 2 minutes (less duration
 heating does not lead to the formation
oxide layer) at 700 ° С in the vacuum at CRT pumping, and then carried out at room temperature and pressure
0
SRI. When heated, the pressure was v-lO Pa gas, with a partial pressure of oxygen of 2-10 Pa. These conditions caused a light brown discoloration of the surface of the electrode 9 during the observation process at a constant temperature. After the usual treatment, including pumping and welding of the CRT, no change in color was observed and the damping voltage was approximately 35 kV. The quenching voltage is the highest residual voltage between the electrode 9 and the anode, at which no afterglow is observed with the naked eye. A damping test was carried out in a dark room with dark-adapted eyes. If the NRT CRT is an afterglow, the damping voltage is typically H1> 25 kV. As a result, after the test, high-frequency heating of the electrode 9 was carried out at a pressure of 10 Pa with
0
five
approximately 15 nins, which is not a cause of a visible change in the color of the electric rod (2 9.
Oxxi film on metallic noBepxiiocTii increases the work function. Guerchiostat, Guvish, an energy barrier for emitting electrons and an afterglow of E. Some oxides of high volatile gases, high temperatures in vacuum, leading to loss of oxide. II afterglow increases. An electrO7 e 9 layer creates an oxide layer that does not evaporate in jcyyMG at high-frequency ps heating temperatures. The method can be applied to any metal or alloy that forms a oxide that is not resistant to the nose, oOr processing.
In the case of manufactured stainless steel electrodes, g-sterial, commonly used for electro-1 .DE EV CRT, oxide layer. mainly iron oxide, it is created; -;:; at temperatures of HJDKO. These oicncji iron are sparged under vacuum at temperatures higher. and, this is the 1G / disappear in the subsequent stages of conventional CRT processing, and the CRT has an increased afterglow. The window film formed at higher temperatures (nano-scale 700-) is mainly chromium-based, and the rotor is not present at normal conditions of pumping and high-frequency heating. When e. X is not formed, a film of oxide is not formed, 1; the ri- t process is not controlled, the CRT therefore preserves and,:.; Metal oxide and metal and has a afterglow.
In order to classify the degree of oxidation of the electrode 9 from the first hp; all of the steel, soil samples, was heated in air for 30 gs by PGs and various temperatures, as shown in. the table. Tubes of the bynas were assembled and the electrode 9 of each tube was. oxidized in forevacuum by you-. sub-frequency heating to even out the color of the surface from the specimen-and 1.3 and 5. In T1) slabs with dan-fi .. el-gs damping voltages of 3.4 kV or more.
З- №
Heating in air for 30 minutes at a temperature of, C
Color when heated


Light Yellow / Kelty
Light brown
Copper Purple

The thin oxide on the electrode 9 is easily damaged when the surface comes into contact with a mechanical tool such as. as Bb paBHHBiiiOD.i; ee methods used in the production of push k. So about (5 times, it is necessary that the oxidation is carried out after complete assembly of the reinforcement. The thickness of the oxide is a flue of the heating temperature, heating time and partial oxygen pressure. Ecjn oxidation at high temperatures is carried out at atmospheric pressure, the rate of formation of oxide of the eye, kets 1 is higher than necessary, and effective control of the Process. An excessive thickness of the layer of oxide leads to the formation of an electrically insulating layer, which is not , because normal operation of the electron gun is disrupted. By electrolamping it is meant a layer that keeps the charge within six minutes. On the other hand, if the oxygen pressure is too low, a long period of time is required to obtain the desired layer. let off the oxidized H.uej until a yellowish oxide layer is formed. This can be obtained by heating at 700 for 2 min at a pressure of oxygen. yes (1.3 - 3.9} 10 Pa .. Oxidation can also be performed in a conventional furnace. At an atmospheric pressure of 105 Pa.
in a mixture, for example, 0.013-10 Pa, with the aim of improving the quality of the tube,

权利要求:
Claims (2)
[1]
spirit and 0.987 Pa Argon. Invention Formula
By selective pumping, I selectively heat at least a part of the focusing electrode of the assembly to a temperature of 5, a range of 700-800 C in the atmosphere,
before pumping out, at least a part of the focusing electrode is heated selectively: the electrode assembly is at a temperature of 5 ° C in the range of 700-800 ° C in the atmosphere and has 1. A method of manufacturing a cathode ray tube, including assembling an armature assembly from successively spaced electrodes, welding the assembly into a flask, pumping out gases from the flask U to a pressure not higher than 1.3 to 10 Pa, and then heating at the same pressure the conductive parts of the fittings to a temperature higher than 50 ° C, characterized in that, with a tube 15 expanded to the anode.
29
partial pressure (1.3-3, 10 Pa for at least 2 minutes of oxidation).
[2]
2. The method according to claim I, about and with the fact that the village heating is carried out on a part of the focusing elec
/
ten
L-tli- ::::: - -3 5,, TTQ
7 6 2/8
lif 5
(rig. /
Anode tube expanded.
reducing parasitic oxygen pressure (1.3-3, 10 Pa for a period of at least 2 min. of surface oxidation).
2. The method according to p. I, that is, and that with the selective heating of the focusing electrode, about (rig. /
fie.Z
Editor 10. Sereda
Compiled by B.Aleksandrov
Tehred. I.Popovich Proofreader O.Lugov
Order 3618/60 Tiral 643Subscription
VPIIPI USSR State Committee
for inventions and discoveries 113035, Moscow, L {-35, Raushsk nab. 4/5
. Production and printing company, Uzhgorod, Projecto st., 4

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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US06/279,740|US4406637A|1981-07-02|1981-07-02|Processing the mount assembly of a CRT to suppress afterglow|

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