JPS60257046A - Fluorescent character display tube - Google Patents

Abstract

PURPOSE:To prevent disconnection of wiring patterns at the time of soldering for lead terminals by providing a slit to each electrode conductive terminal. CONSTITUTION:The leadout part 6a of wiring pattern 6 formed on an anode substrate 2 corresponding to each electrode and electrode conductive terminal 7 are guided to the outside of vacuum case and a slit 20 is provided to each electrode conductive terminal 7. Since the solder area of each electrode conductive terminal 7 is small and amount of solder to be placed is reduced at the time of soldering the lead terminals, concentration of soldered area during the cooling process by temperature drop after the solder dip is small and strain is also small, disconnection by crack generated on the wiring pattern can be prevented. Moreover, since each electrode conductive terminal 7 is plitted at the slit portion 20, if crack 30 is generated at a local area of the one piece, continuity can be assured with the other piece.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a fluorescent display tube, and particularly relates to wiring that occurs when a lead terminal is soldered and connected to an electrode conduction terminal led out of the tube through wiring. This invention relates to a lead extraction structure for a fluorescent display tube that prevents breakage.

[Prior art]

FIGS. 1 and 2 show a partially cutaway sectional view of a conventional fluorescent display tube and a sectional view of its lead terminal portion. The fluorescent display tube includes a wiring pattern 6 formed on an insulating glass substrate 1 by thick film printing of silver paste, for example, and an anode 8 coated with a phosphor. Each electrode such as a grid 9 and a cathode 10 is mounted to form an anode substrate 2, and a face glass 3 as an envelope is sealed on this anode substrate 2 with a frit glass 4 to form a vacuum container 5.

At this time, the respective electrodes mounted on the anode substrate 2 in the vacuum container 5 are led out to the vacuum container 5 through the wiring patterns 6 formed by corresponding to these electrodes, and Electrode conduction terminals T are formed at each end.Next, after evacuating the inside of the vacuum container 5,
A lead terminal 11 called a clip pin is soldered onto each of the electrode conduction terminals 7 to make a connection 1-, and then a resin mold 12 for mounting reinforcement is applied to the lead terminal 11. ing. In addition, in FIG. 1 and FIG. 2, 13- is the wiring pattern 6K on the glass substrate 2.
An insulating layer formed as an overcoat layer, 14 a solder layer connecting each electrode conduction terminal 7 and lead terminal 11, 15 (
4 exhaust pipes and 16 a getter inside the vacuum container 5.

By the way, each electrode conduction terminal T has the shape shown in FIG. 3, and its width W1 has the same dimension as the width of the lead terminal 11. , a derived portion 6 with a width W corresponding to the lead of the wiring pattern 6
aI''i Considering the prevention of disconnection during thick film printing and the internal wiring density e, etc. (~, usually, Wl)W, it is formed with the following relationship.In addition, in FIG. The sealing boundary between the frit glass 4 and the face glass 3 is shown.

However, in the conventional lead lead-out structure described above, when the electrode conduction terminal 7 made of a silver layer and the lead terminal 11 are connected by solder dipping in the process of soldering the lead terminal 11, each electrode conduction terminal After the solder dip, the surface 11 shrinks as the temperature decreases, leaving behind the electrode conduction terminal surface at the soldered portion. Therefore, the joint part between the electrode conduction terminal 7 and the lead-out part 6a of the wiring patch 6, which has a sudden change in shape (see the part A surrounded by the dashed-dotted line in FIG. This often caused problems such as disconnections in the wiring patterns. This problem was particularly noticeable as the area of the electrode conduction terminal became larger.

[Summary of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to provide a fluorescent display tube that prevents the wiring pattern from breaking when soldering the lead terminal.

In order to achieve such an object, one aspect of the present invention is to provide an anode formed by an anode substrate and an envelope sealed on the substrate;
An electrode conduction terminal forming a part of the wiring pattern drawn out corresponding to each electrode such as an anode, a grid, and a cathode on an anode substrate outside the vacuum chamber, and a conduction terminal for each of these electrodes. Part 1 on the terminal. In this lead extraction structure for a fluorescent display tube, which is provided with J1 soldered and -de terminals, a slit portion is provided in each of the electrode conduction terminals.

Another aspect of the present invention is that in the lead lead-out structure of the fluorescent display tube, each electrode conduction terminal has a width approximately equal to that of the lead terminal, and its longitudinal direction is connected to the seal between the anode substrate and the envelope. These electrode conduction terminals are provided with slits in order to form a plurality of wiring leads to the lead terminals near the boundary of the sealing part.

Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

FIG. 4 shows a third embodiment of the fluorescent display tube according to the present invention.
It is a plan view of the electrode conduction terminal portion corresponding to the figure, and in the figure, the same or corresponding parts as in FIGS. 1 to 3 are designated by the same reference numerals 1 to 3. The fluorescent display tube of this embodiment has an anode substrate 2
The lead-out portion 6a of the wiring pattern 6 and the electrode conduction terminal 7 formed on the top corresponding to each electrode are led out of the vacuum container 5, and then the lead terminal 11 is placed on each electrode conduction terminal 7.
The point that the terminals are connected by soldering is similar to the conventional one shown in FIGS. It is provided. In this case, each electrode conduction terminal 7 has the same dimensions as the conventional example, and the width W2 of the slit portion 20 is 2W to 3W.
By providing the slit portion 20 in each electrode conduction terminal 7 in this way, the lead terminal 11 has the same size as the conventional one.
- When attaching the electrode conduction terminals 7 in a semicircular manner, the area of each electrode conduction terminal 7 is small and the amount of solder applied is also reduced. It is possible to reduce the size of the wire, and prevent wire breakage due to cracks occurring in the -C1 wiring pattern. However, each electrode conduction terminal 7 has a divided structure at the slit portion 20, so even if a crack 30 occurs in one local part as shown in Fig. 1, continuity can be established in one part. , is effective in preventing wire breakage.

FIG. 5 is a plan view of the electrode conduction terminal portion corresponding to FIG. 1, showing another embodiment of the fluorescent display tube according to the present invention. The difference from the embodiment shown in FIG. 4 is that wiring patterns 60 are drawn out on the anode substrate 2 outside the vacuum vessel 5 in correspondence with each electrode.
As an electrode conduction terminal, it has a width approximately equal to that of the lead terminal 11, and its longitudinal direction is connected to the anode substrate 2 and the face glass 3.
Electrode conduction terminals 7A extending into the sealed portion with the electrode conduction terminals 7A are formed, and the boundary 1 of the sealed portion is formed on these electrode conduction terminals 7A.
7, a slit portion 21 is provided for the lead terminal 11 in order to form two terminal portions 7A+ and 7A2 for the wiring drawers 1 to 1.

In this way, each electrode conduction terminal 7A has a slit portion 2.
1, when soldering the lead terminals 11 in the same manner as described above, the soldering area of each electrode conduction terminal 7A is small and the amount of solder applied is also reduced, and each terminal portion 7A+,
Since 7A and 2 are parallel to each other and there is no sudden change in shape near the boundary of the sealing line, the shrinkage effect of the soldering part during cooling after soldering is small, and it is the same as the above-mentioned embodiment 1-DA. It is possible to prevent disconnection of the wiring pattern. In this embodiment, in addition to providing one slit portion 21 in each electrode conduction terminal 7A, the width may be further reduced to provide a plurality of slit portions.

In this series, the wiring pattern on the anode substrate is formed by a thick film printing method using silver paste. [Effects of the Invention] ``Explained below'': 1Lrc, According to the fluorescent display tube of the present invention, the half-IB attachment of the lead terminal prevents disconnection due to cracks that sometimes occur in the wiring pattern. In addition, there is less solder buildup on the lead terminals, and the amount of conductor paste used can be reduced, so reliability, yield, and quality can be improved when manufacturing fluorescent display tubes. It has excellent effects.

[Brief Description of the Drawings] Figures 1 and 2 are a partially cutaway sectional view of a conventional fluorescent display tube and a sectional view of its lead terminal portion, and Figure 3 is a cross-sectional view of one of the conventional fluorescent display tubes shown in Figure 1. FIG. 4 is an enlarged plan view of the electrode conduction terminal portion, FIG. 4 is a plan view of the electrode conduction terminal portion corresponding to FIG. 3 showing one embodiment of the fluorescent display tube according to the present invention, and FIG. 5 is another embodiment of the present invention. FIG. 3 is a plan view of an electrode conduction terminal portion showing an example. 1...Glass substrate, 2...Anode substrate, 3...
・Face glass, 4... frit glass, 5...
...Vacuum container, 6...Wiring pattern, 7,7A...
... Electrode conduction terminal, 11 ... Lead terminal, 20.2
1...Slit part. Patent applicant: Masazono Yamakawa (and 2 others), agent of Ise Electronics T Gyo Co., Ltd.

Claims (2)

[Claims] (1) Anode substrate and an envelope sealed on the substrate: A vacuum vessel (formed by K) and each electrode (anode, grid, cathode, etc. 1. An electrode conduction terminal forming a part of the drawn wiring pattern, and a conduction terminal soldered to each of these electrode conduction terminals, and each of the above-mentioned A fluorescent display tube characterized in that a slit portion is provided in the electrode conduction terminal. (2) A vacuum container formed by an anode substrate and an envelope sealed on the substrate, and a vacuum container formed by an anode substrate outside the vacuum container corresponding to each electrode such as an anode, a grid, and a cathode. 7. Electrode conduction terminals forming a part of the derived wiring pattern, and lead terminals with half EB attached to each of these electrode conduction terminals are provided, and electrode conduction of each of the above 2. The terminals have approximately the same width as the lead terminals, and are extended in the longitudinal direction within the sealing area 1 between the anode substrate and the envelope. A fluorescent display tube characterized in that a slit portion is provided to form a plurality of wiring drawers for a lead terminal.