JPH0458433A - Assembly method for flat-type cathode-ray display apparatus - Google Patents

Abstract

PURPOSE:To elevate the precision of the positioning of an electrode structural body and a screen face by positioning the electrode structural body and the screen face on a front board using a magnetic positioning means in a casing and a magnetic position modulating means in the outside of the casing and fixing them. CONSTITUTION:After a plurality of magnetic positioning means 60 are assembled in a supporting substrate 44, the supporting substrate 44 is mounted on a height limiting means 46 and a first fixing means 56 and then the end part 45 of the supporting substrate 44 and the end part 15 of a back side plate 14 composing a casing 40 are roughly positioned and put together face to face and tentatively fixed by a plate fixing means 78. After that, a movable connecting means 52 is caught by an en bloc connecting jig and the connecting conductor 48, that is the end part, is connected with the end part of a horizontal control electrode 16 of the supporting substrate 44 and an electrode terminal 16a on a flange part 14c of the back side plate 14 by electric or optical connecting means such as supersonic wave, laser, high frequency, or low resistance welding or electric connecting means such as firing a conductive paste of e.g. silver, etc., in the way of being movable freely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flat cathode ray display device used for displaying characters and graphics, and particularly to a flat cathode ray display device used for displaying characters and graphics, and particularly to a flat cathode ray display device that is used to display characters and graphics. The present invention relates to an improvement in a method for assembling a flat panel cathode ray display device, which allows the display device to be assembled while easily positioning the display device.

[Conventional technology]

Various flat-type cathode ray display devices have been proposed in the past, and these display devices emit electrons from an electron source by applying a high voltage of several hundred to several kV to the cathode, which is placed in correspondence with the cathode. The phosphor layer integrated into the anode is irradiated to emit light. The electrode assembly consists of a plurality of electrodes that are placed between the cathode and the anode or on the back or side surfaces of the cathode to control the amount of electron beams emitted from the cathode or to deflect or focus the electron beams. ing.

An example of this display device will be described with reference to FIG. horizontal control electrode 16 provided perpendicular to the cathode 12;
, an electron extraction electrode 18 provided immediately before the cathode 12 and divided horizontally in substantially the same way as the cathode 12, a pair of vertical deflection electrodes 20 provided to sandwich the cathode 12, and a plurality of cathodes. The front plate 26 has a phosphor N24 which is disposed opposite to the surface constituted by 12 and has an anode 22 metal-backed on an insulating substrate such as glass. In the drawing, adjacent deflection electrodes of the pair of vertical deflection electrodes 20 are fused together. Further, in FIG. 1, in order to make the explanation clear, only the electrodes of each part are shown, and parts such as the envelope and getter are omitted except for the front plate and the back plate.

Next, the above constituent members and their functions will be explained.
The cathode 12 is, for example, a direct heating type in which a thin tungsten wire with a diameter of several tens of gm is directly coated with an electron radioactive substance such as (Ba, Sr, Ca)0, or a thin tungsten wire coated with a heat-resistant insulating material such as alumina. It is either an indirectly heated type in which the heater wire and a nickel sleeve covering the heater wire are coated with an electron radioactive material. Directly heated cathodes are directly energized, and indirectly heated cathodes are built-in. By energizing the heater wire, the electron radiation temperature is 600-8.
It is heated to 00℃. In addition, in the case of an indirectly heated cathode, the cathode is constantly energized, but in the case of a directly heated cathode, when the cathode is selected and emits an electron beam, the heater current is turned on occasionally. The cathode is cut off, and the potentials to other electrodes are made equal across the length of the cathode. FIG. 1 shows an indirectly heated cathode 12, which is denoted by 1.
2a is a heater wire, and 12b is a sleeve. The electron extraction electrode 18 is a single metal plate-shaped electrode or cathode 12 having a plurality of through holes 18a for passing electrons.
It consists of a plurality of strip-shaped electrodes divided horizontally in correspondence with each other, and is used to focus and extract electrons from the cathode 12 by applying a positive potential to the cathode 12 during electron emission. .

The vertical deflection electrodes 20 are arranged to sandwich the cathode 12,
A pair of metal electrodes or an insulator provided with a metal film, having a concave portion 20a substantially parallel to the screen surface of the front plate 24 and a deflection portion 20b inclined toward the cathode 12 or substantially perpendicular to the screen surface. It consists of a pair of electrodes, or a pair of electrodes formed by forming a metal plate or a metal film on an insulating substrate provided almost perpendicularly to the front plate 24, and which collects electrons extracted through the electron extraction electrode 18. It is focused and deflected in the vertical direction, and is used to deflect and scan a predetermined rask area of the phosphor screen surface provided on the front plate 24.

The horizontal control electrode 16 is located closer to the back plate 14 than the cathode 12,
Consisting of a plurality of electrodes arranged perpendicular to the stretching direction of the cathode 12, this horizontal control electrode 16 is vertically divided into approximately the same number as the horizontal resolution of this device, and
It is used to horizontally control a sheet-shaped beam taken out from the electron extraction electrode 18 or a plurality of divided beams divided by the plurality of through holes 18a of the electron extraction electrode 18 and deflected in the same direction. The horizontal control electrode 16 basically consists of an electrode piece formed on the back plate 14 by depositing or etching a metal or conductive material.

The front plate 26 is made of a transparent insulating material such as glass, and is provided substantially parallel to and facing the plane constituted by the plurality of cathodes 12, and has a phosphor layer integrated with the anode 22, such as thin film aluminum. 24 is provided all over this front plate 26.

Next, the driving method and operation of the device shown in FIG. 1 will be explained.
In this device, the set of cathode 12 and vertical deflection electrode 20 is used as a scanning electrode, and the horizontal control electrode 16 is used as a data electrode, and by performing line sequential scanning using these scanning electrodes and data electrodes, arbitrary 9 that can display images, for example, S shown in FIG.

S,,S2,S:1. To display an image on the screen surface by connecting the small areas S4, or to perform electron beam scanning, first, only the potential of the cathode 12 corresponding to the area S□ is made lower than the potential of the electron extraction electrode 18, and on the other hand, By setting the potential of the cathode in the remaining region 82 to 84 to a sufficiently deep negative cutoff potential with respect to the potential of the electron extraction electrode 18, electrons are extracted only from the cathode 12 of S□, and immediately after that, the cathode 12 A gradually increasing copper-covered, step-shaped, or triangular wave voltage is applied to one side of a pair of vertical deflection electrodes 20 arranged to sandwich the cathode 12, and the deflection electrode 20 on the opposite side facing with the cathode 12 in between is applied. By applying a voltage that gradually decreases to S, an area S is deflected and scanned on the screen surface.

Next, the shade ai12 corresponding to the area S2 is selected and similarly deflected and scanned, and then the areas S3 and S4 are sequentially scanned to form one frame. Also, a video signal is sent to the horizontal control electrode 16 in synchronization with the scanning timing of each area. As such, the anode 22 is made of a glass plate having a screen surface consisting of a metal-backed phosphor layer 24 and a tip tube 28 for evacuating the inside of the envelope. The cathode 12 also includes a cathode locking means 30 fixed to the concave portion 14a of the back plate 14 by sealing the glass with low melting point solder or by welding or the like, and a spring material for stretching and tensioning the cathode 12. cathode extension means 3 having
2, and is positioned in the vertical and height directions by a cathode positioning member 34 provided on the base portion 14b of the back plate 14.

Further, the horizontal control electrode 16 is fixedly provided on the base portion 14b of the back plate 14, and extends over the flange portion 14c extending from the base portion 14b. Electron extraction electrode 18
The vertical deflection electrode 20 is integrally fixed onto the horizontal control electrode 16 by a spacer (not shown). The electrode structure consists of these horizontal control electrodes 16. It includes an electron extraction electrode 18 and a vertical deflection electrode 20.

Furthermore, the back plate 14 and the front plate 26 are sealed together in a sealing jig (not shown) with positioning means 36 such as protrusions and brush markings provided on the side walls 14d and 26d, respectively. The parts 14e and 26e were fixed to each other by applying a low melting point solder glass paste and firing the paste.

[Invention or problem to be solved]

However, the display devices of the prior art have a problem of low accuracy in positioning the electrode structure with respect to the screen surface of the phosphor layer. That is, as described above, in the display device of the prior art, a front plate having a screen surface of a phosphor layer and a back plate integrally having an electrode structure including a plurality of electrodes such as a cathode and a deflection electrode, They are aligned and positioned by alignment means provided on the face plate and back plate. However, in the case of a monochrome phosphor screen where the phosphor screen surface is monochrome and does not have a guard band such as a black matrix made of a black conductor such as carbon, is this positioning means applicable?
, G, and B in the form of stripes with a width of 0.1 to 0.2 mm or in the form of dots with a diameter of 0.1 to 0.2 mm, and each of these phosphors In the case of a color phosphor screen in which a narrower guard hand is provided between the screens, it is extremely difficult to apply the above positioning means.

In addition, in the conventional technology, since the electrode structure is directly attached to the back plate, after assembly, the back plate and front plate are hermetically sealed with low melting point solder glass, and a process such as panel baking is performed. During the repeated heat treatment process at 400 to 480 degrees Celsius, the relative position between the electrode structure and the screen surface may change due to thermal expansion, and in such a case, the entire structure including the casing becomes defective. There was.

SUMMARY OF THE INVENTION In order to avoid the above-mentioned drawbacks, an object of the present invention is to provide a method for assembling a flat panel cathode ray display device, which has a simple structure and can achieve high positioning accuracy between the electrode structure and the screen surface.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an envelope including a front plate, a back plate, and a side wall having a screen surface with a plurality of phosphor patterns; A flat plate comprising an electrode assembly disposed within the container and supported directly or via a support substrate, and a lead-out terminal provided on the sealing surface of the envelope or outside the envelope and movably connected to the electrode assembly. type cathode ray display device, a magnetic positioning means and a first fixing means are provided on the electrode assembly or a support substrate supporting the electrode assembly, and a second fixing means is provided on a part of the inner surface of the envelope corresponding to the first fixing means. After the magnetic positioning means is precisely positioned by the magnetic positioning means installed outside the envelope using the positioning markers provided on the envelope and the electrode assembly or its supporting substrate, the magnetic positioning means is precisely positioned. The present invention provides a method for assembling a flat panel cathode ray display device, characterized in that the first and second fixing means are fixed by welding.

(Function) In this way, when the electrode assembly and the screen surface on the front plate are positioned and fixed by the magnetic positioning means inside the envelope and the magnetic potential HF1l adjustment means outside the envelope, the electrode assembly and the screen surface are aligned. The electrode assembly and envelope can be thermally expanded freely during the thermal process, so the manufacturing yield can be greatly increased without causing distortion or damage to the electrode assembly as in the case of conventional methods. You can improve.

(Embodiment) An embodiment of the present invention will be described in detail with reference to FIG. 3 and subsequent figures.A flat panel cathode ray display device 10 assembled according to the present invention has the same features as described in the prior art of FIG. The envelope 40 includes a front plate 26 having a screen surface with a plurality of phosphor patterns, a back plate 14, and a side wall formed of a side wall portion extending from the front plate 26 and the back plate 14.

The front plate 26 has a chip tube 28 penetrating its side wall portion, and the back plate 14 does not have a base portion 14b, but has a height on which a support substrate 44 that will be placed later is placed and regulates the height of this support substrate. It has a lower stage 46 of the restriction part.

In the illustrated embodiment, the electrode assembly 42 is supported not on the back plate 14 but on a pedestal 44a of a support substrate 44 housed between the front plate 26 and the back plate 14; This support substrate 44, which may be supported on the back plate 14 in the same manner as in the art, is made of an insulating material such as glass or a metal material with an insulating coating.

Similar to the conventional example shown in FIG.
Linear cathode 1 attached to support substrate 44 across 4a
Contains 2. The linear electrode 12 is the same as the conventional example,
It is stretched between a cathode locking means 30 and a cathode extension means 32 provided on both sides of the base portion 44a of the support substrate 44, and is positioned by a cathode positioning means 34. As shown in FIG. 4, the cathode 12 includes a cathode terminal 12a fixed to opposing edges of the back plate 14 and a cathode locking means 3.
0 or the cathode extension means 32 by a movable connection means 38 made of a thin wire of aluminum, gold, copper, etc., which is wire-bonded between the electrode and the cathode extension means 32. In addition, connecting means such as a movable connecting means for a cathode terminal may also be connected to the electron extraction electrode 18 (not shown) or to the lead-out terminal of a planar electrode used for electron beam focusing, monitor control, etc. can be applied.

As can be seen from FIG. 3, the back plate 14 has opposing flanges 14c, and these flanges 14c have electrode terminals connected to the horizontal control electrodes 16 provided on the base 44a of the support substrate 44. 16a is provided. When the support substrate 44 is placed on the height regulating means 46 of the back plate 14,
The plurality of horizontal control electrodes 16 on the support substrate 44
They correspond to the plurality of electrode terminals 16a on the flange portion 14c of No. 4, respectively, at the same height position. As shown in FIGS. 6(A) and 6(B), these corresponding horizontal control electrodes 16 and corresponding electrode terminals 16a are connected to a flexible insulating plate 50 having a connecting conductor 48 bonded across both. They are connected by a movable connecting means 52 consisting of. The connection conductor 48 is 0.1~
The connecting conductor 48 is made of a conductor made of 426 alloy, stainless steel, copper, silver, nickel, etc. or a plated striped or wire conductor with a thickness of several mm. The number of insulated conductors used is approximately the same as the number of electrodes 16, and the insulated conductor is formed by directly coating an insulating material such as SiO2 alumina, or by applying a thin insulating layer using alumina sol-gel coating or electrodeposition. The movable connecting means 52 is constructed by sandwiching and integrating a cross-shaped or sheet-shaped flexible heat-resistant insulating material made of glass, quartz, or the like several millimeters thick (see FIG. 5).

Next, describing the assembly method of the present invention, the cathode terminal 12a and the electrode terminal 16a are located at the sealed end surface of the back plate 14 and the front plate 26, and the recessed part 14a of the back plate 14 is temporarily fixed to be attached later. Through hole 54 with an outer diameter several mm thicker than the diameter of the pin
A first fixing means 56 consisting of a fixing member 54 made of metal such as 426 alloy having a magnetic field a is provided, and magnetic positioning means 60 consisting of permanent magnets 58 and a first fixing means 56 are provided on the support substrate 44 at its four corners. A second fixing means 64 made of a metal fixing plate 62 is provided correspondingly. The magnetic positioning means 60 in which the second fixing means 64 and the support substrate 44 are provided with through holes corresponding to the through holes 54a of the first fixing means 56 is shown in FIG. 7(A). In addition to a simple ferromagnetic material such as soft iron or permanent magnet 58, as shown in FIG.
) Magnetic shielding means 66 consisting of an enclosure of ferromagnetic material such as metal may also be provided. This magnetic shielding means 66 has an opening on the outer side of the envelope and is magnetically positioned through this opening, but in such a way that the magnetic flux does not penetrate the surrounding electrodes and affect the beam landing. It has a function. Moreover, the magnetic positioning means 6
0, as shown in FIG. 7(C), a coil 70 may be wound around the permanent magnet 58 and a current may be passed therethrough to cancel the magnetic flux. Furthermore, as shown in FIG. 7(D), the magnetic positioning means 60 may be in the form of an electromagnet in which a coil 74 is wound around a core 72 of a ferromagnetic material such as ferrite. It exhibits magnetism when energized. The external terminal of the coil 74 may also be used as the cathode terminal 12a connected to the cathode locking means 30, for example. In this way, it is preferable to move the support substrate 44 to a predetermined position only during positioning, and then cut the coil glue wire using a laser from outside the glass envelope, since there is no need to increase the number of electrodes. . Further, when an electromagnet is used, it is not necessary to provide any particular shielding means.

In order to prevent the support substrate 44 and the back plate 14 from coming apart, temporary fixing means 78 consisting of a temporary fixing pin 76 is used, and this temporary fixing pin 76 is provided on the first fixing means on the back plate 14. It fits loosely into the through hole 54a.

After assembling the plurality of magnetic positioning means 60 on the support substrate 44 and placing the support substrate 44 on the height regulating means 46 and the first fixing means 56, as shown in FIG. 6(A), Then, the end portion 45 of the support substrate 44 and the end portion 15 of the back plate 14 which will become the envelope 40 are roughly positioned and butted and temporarily fastened by the temporary fastening means 78. Thereafter, the movable connection means 52 is caught by a batch connection jig (not shown), and the connection conductor 48 at the end thereof is connected by electrical or optical connection means such as ultrasonic, laser, high frequency, or resistance welding, or by conductive paste such as silver. The ends of the horizontal control electrodes 16 on the support substrate 44 and the electrode terminals 16a on the flange portions 14c of the back plate 14 are movably connected by electrical connection means such as firing.

Next, the support substrate 44 and the screen surface 27 on the front plate 26 are positioned and fixed as described below.

FIG. 8 shows the state of the envelope 40 after being vacuum-sealed, and the electrode assembly 42 is shown with a broken line to simplify the explanation.

As shown in FIG. 8, a magnetic external positioning means 80 made of a ferromagnetic material, a permanent magnet, or an electromagnet is located on the support substrate 44 of the vacuum-sealed envelope 40 at a position substantially opposite the magnetic positioning means 60. put The supporting substrate 44 and the screen surface 27 are each provided with positioning markers (not shown), or minute holes are formed integrally with a pattern mask in which, for example, a color phosphor screen or a black guard pant is formed by an exposure method in a plane perpendicular to the screen surface 27. On the other hand, the electrode structure 42 is provided with a positioning hole when forming the electrode hole pattern, and the light or laser beam perpendicular to the screen surface 27 is incident from the outside of the envelope to maximize the amount of transmitted light. Is it possible to rotate the support substrate 44?
You can position both by moving them in a straight line.

Thereafter, as shown in FIG. 9(A), the first fixing means 56 in the back plate 14 and the second fixing means 6 on the support substrate 44
4 and a glass-transparent laser beam, for example, the wavelength is 0.
．． These two were irradiated with 6943gm ruby laser light.
The contact interface between the two fixing means 56,64 is welded. In this case, the through hole 54 provided in the first fixing means 56
The side wall of a and the surface of the second fixing means 64 are fixed by welding. At this time, the support substrate 44 of the second fixing means 64
11, it is desirable to provide a punch hole 44b in the support substrate 44 in order to release high temperature during welding. In addition, the support substrate 4
4 and the back plate 14, in this embodiment, pin-shaped temporary fixing means 78 provided on the support substrate 44 and the first The temporary fixing is done by a through hole 54a provided in the fixing means 56, or any suitable temporary fixing means can be used.

Further, in this embodiment, the periphery of the through hole of the fixing means 56, 64 through which the temporary fixing dowel 76 passes through to prevent the electrode assembly 42 and the back plate 14 from coming apart during the working process is fixed by welding. In addition to the temporary fixing pin 76, the height regulating means 46 may be of any shape, such as a U-shaped clip, as long as it can prevent dissociation without hindering the movement of the back plate 14 and the electrode assembly 42. As shown in FIG. 3, the height regulating means 46 may be omitted if the fixing means 56 and 64 can be precisely controlled in height. You may do so.

Further, in the above embodiment of the present invention, the electrode assembly 44 is fixed to the back plate 14, but as long as it does not interfere with the normal operation of the screen surface 27, it can be attached to the first
A second fixing means 56 is fixed to the side wall of the envelope on either side of the front plate 26 or the back plate 14, and a second fixing means 64 is provided on the support substrate 44 that supports the electrode structure 42, and This mating surface may be welded and fixed, or magnetic positioning means and fixing means may be provided in a part of the electrode or in the middle of the electrode structure 42 without attaching the electrode structure 42 to the support substrate 44. That is clear. Furthermore,
A plurality of supporting substrates and electrode assemblies may be provided in the envelope, and each may be individually positioned and fixed.

Further, in the above embodiment, a laser beam is used as the welding fixing means between the fixing means 56 and 64, or the first and second
An electrical connection terminal is connected to the fixing means 56 and 64, and the electrical connection terminal is passed through the envelope by the sealing surface of the envelope or by melt press-fitting, and after positioning and fixing it, energization is applied. It may be welded and fixed by resistance heating means.

〔Effect of the invention〕

According to the present invention, as described above, after all the assembly work steps in the envelope are completed, the electrode assembly and the screen surface on the front plate are positioned and fixed by the magnetic positioning means, and then the electrode assembly and the screen surface on the front plate are positioned and fixed. In addition to being able to precisely position the electrode structure and the screen surface, the electrode structure and envelope can thermally expand freely during the thermal process, so the electrode structure can be manufactured without distortion or damage as in conventional methods. There is a practical benefit of greatly improving yield.

[Brief explanation of the drawing]

1 and 2 are an exploded perspective view of a conventional flat panel cathode ray display device and a perspective view of its specific assembly structure with the front panel opened, and FIG. 3 is a flat panel cathode ray display device according to the present invention. An exploded perspective view of. FIG. 4 is a perspective view of the movable connection means for the cathode terminal, FIG. 5 is a plan view of the movable connection means for the horizontal control electrode, and FIG. 6(A)
(B) is a perspective view and a sectional view of the mounting state of the connecting means shown in FIG. 5, FIGS. 7(A) to (D) are perspective views of different examples of the magnetic positioning means, and FIG. 9A and 9B are perspective views showing different examples of states in which the first and second fixing means are welded and fixed. It is.

Claims (1)

[Claims] an envelope including a front plate, a back plate, and a side wall having a screen surface with a plurality of phosphor patterns; an electrode structure disposed within the envelope and supported directly or via a support substrate;
In a flat cathode ray display device comprising a sealing surface of the envelope or a lead-out terminal provided outside the envelope and movably connected to the electrode assembly, the electrode assembly or a support for supporting the electrode assembly; A magnetic positioning means and a first fixing means are provided on the substrate, and the first fixing means is provided on a part of the inner surface of the envelope.
A second fixing means is provided corresponding to the fixing means, and the magnetic position adjusting means installed outside the envelope uses a positioning marker provided on the envelope and the electrode assembly or its support substrate to A method for assembling a flat panel cathode ray display device, characterized in that after precisely positioning the positioning means, the first and second fixing means are fixed by welding.