JPH087768A - Fluorescent display tube and inspection method for fluorescent display tube - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fluorescent display tube capable of surely and easily performing insulation inspection of an anode conductor. [Arrangement] The anode substrate 3 of the envelope 5 of the fluorescent display tube 1 has a protruding portion 6 which has one end protruding outward. The wiring conductor connected to the anode conductor in the envelope is continuous with the extension conductor 7 formed on the upper surface of the protrusion 6. Each of the extension conductors 7 is covered with a plurality of rectangular first insulating films 8 along the direction orthogonal to the longitudinal direction of the extension conductors 7 every other line. The uncovered portion between the first insulating films 8 is the first exposed portion 9. Next to the first exposed portion 9, a second exposed portion 11 is formed by the second insulating film 10 while being displaced by one extension conductor.
Conductive rubbers 12, 1 are provided on the first and second exposed portions 9, 11, respectively.
3 is contacted and the insulation resistance between the conductive rubbers 12 and 13 is measured. If the insulation resistance is large enough, the adjacent extension conductor
Insulation between 7,7, that is, insulation between adjacent wiring conductors in the envelope 5 is guaranteed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube having a structure capable of easily inspecting the insulation of a wiring conductor in an envelope, and a method for inspecting the insulation of the wiring conductor in the fluorescent display tube. .

[0002]

2. Description of the Related Art A fluorescent display tube has, in addition to an anode, which is a light emitting display section, various electrodes and the like inside an envelope. A plurality of wiring conductors respectively connected to the plurality of anode conductors are formed on the inner surface of the anode substrate forming a part of this envelope. These wiring conductors are generally formed of an aluminum thin film.

In recent fluorescent display tubes, the display density of the display section provided in the envelope is high, and this tends to increase the number of wiring conductors connected to the anode conductor. As shown in FIG. 5, in order to lead these many wiring conductors out of the envelope 100, a part of the anode substrate 101 is enclosed.
There is a case where a plurality of extension conductors 102, each of which is continuous with the wiring conductor, is formed on the surface of the protrusion 101a as the protrusion 101a protruding from the outer shape of 0.

In this case, since the number of wiring conductors in the envelope 100 is large, the line width and pitch of the extension conductors 102 are set to be considerably small. For example, the line width is 200 to 300.
μm, and the pitch thereof may be about 400 to 600 μm. An external lead wire (not shown) is connected to the end of the extension conductor 102, and the anode conductor inside the envelope 100 is connected to an external drive circuit or the like.

In order to inspect the insulation between the anode conductors in the above-described fluorescent display tube, the fluorescent display tube is attached to an inspection jig (not shown), and each extension of the protrusion 101a of the anode substrate 101 is extended as shown in FIG. Pins 10 on each conductor 102
3 is applied and the insulation resistance between the adjacent pins 103 and 103 is measured.

[0006]

Since the line width / pitch of the extension conductor 102 is small, when the fluorescent conductor is attached to the inspection jig, the extension conductor 102 is extended with the pin 103 when the position of the extension conductor 102 is displaced in the juxtaposed direction. The conductor 102 cannot be electrically connected and the insulation inspection cannot be performed. Therefore, there is a problem that it takes time to align the fluorescent display tube and the pin 103, and the work efficiency is not good.

Further, since the line width and pitch of the extension conductor 102 are different for each type of fluorescent display tube, it is necessary to prepare an inspection jig for each type of fluorescent display tube, which causes a problem of increase in equipment cost. It was

The present invention provides a fluorescent display tube and a method for inspecting a fluorescent display tube capable of reliably and easily inspecting the insulation of the anode conductor regardless of the line width or pitch of the extension conductor. Has an aim.

[0009]

According to a first aspect of the present invention, there is provided a fluorescent display tube, wherein a substrate constituting a part of the envelope is projected from an outer shape of the envelope, and the envelope is provided. And a plurality of extension conductors connected to the plurality of wiring conductors arranged side by side in parallel with each other on the protruding portion, and two different sets of extension conductors connected to every other wiring conductor. However, each of the protruding portions constitutes two exposed portions arranged in parallel in a predetermined direction.

In the fluorescent display tube according to a second aspect of the present invention, the substrate forming a part of the envelope has a projecting portion projecting from the outer shape of the envelope, and a plurality of protrusions inside the envelope. A plurality of extension conductors connected to the wiring conductor of FIG. 2 and arranged in parallel on the protruding portion, and two exposed portions of the extension conductors that appear every other one along a predetermined direction are offset from each other at two locations. And an insulating film that covers every other one of the extension conductors.

According to a third aspect of the present invention, there is provided the fluorescent display tube according to the second aspect, further comprising a protective insulating film for covering the extension conductor other than the exposed portion.

According to a fourth aspect of the present invention, there is provided a fluorescent display tube having first and second projecting portions formed by projecting a substrate forming a part of the envelope at two locations from an outer shape of the envelope. A first plurality of extension conductors connected to every other plurality of wiring conductors inside the envelope and extending to the first protrusion, and the first plurality of extension conductors And a second plurality of extension conductors connected to a wiring conductor different from that connected to and extended to the second protrusion.

According to a fifth aspect of the present invention, there is provided a method for inspecting a fluorescent display tube, wherein a substrate forming a part of the envelope has a projecting portion projecting from an outer shape of the envelope and an inside of the envelope. A plurality of extension conductors that are connected to a plurality of wiring conductors that are arranged in parallel and that are arranged in parallel on the protrusion, and two different sets of extension conductors that are connected to every other wiring conductor, In a method of inspecting a fluorescent display tube that comprises two exposed portions arranged in parallel in a predetermined direction in a protruding portion, each of the extended conductors of both sets is electrically connected by a common conductive member in the both exposed portions, It is characterized in that the insulation between the conductive members is measured to measure the insulation between adjacent wiring conductors in the envelope.

[0014]

In the projecting portion of the substrate of the fluorescent display tube, two sets of different extension conductors connected to the wiring conductors at different intervals form two exposed portions. When a conductive member is brought into contact with each exposed portion and the insulation resistance between the two conductive members is measured, the insulation between adjacent wiring conductors in the envelope can be determined.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fluorescent display tube of a first embodiment and an inspection method therefor will be described with reference to FIGS. The fluorescent display tube 1 of the present embodiment includes a flat box-shaped envelope 5 composed of a front substrate 2 and an anode substrate 3 facing each other, and a side plate 4 provided between the substrates 2 and 3. Have However, one short side portion of the rectangular anode substrate 3 is a protruding portion 6 that protrudes outward from the box-shaped outer shape of the envelope 5.

Although not shown, inside the envelope 5, an anode, which is a light emitting display portion provided on the anode substrate 3, a control electrode provided above the anode, and further provided above the control electrode. Various electrodes such as a filamentary cathode are provided. The anode has an anode conductor formed on the inner surface of the anode substrate 3 and a phosphor layer provided on the upper surface of the anode conductor.

In the envelope 5, wiring conductors formed on the anode substrate 3 are connected to the respective anode conductors. Each wiring conductor is continuous with the extension conductor 7 formed on the upper surface of the protruding portion 6 of the anode substrate 3, and is led out to the outside of the envelope 5. The line width and the pitch of the extension conductor 7 are the same as the conventional one.

As shown in FIG. 1, the extension conductor 7 on the protrusion 6 is formed by a plurality of rectangular first insulating films 8.
Every other line along the direction orthogonal to the longitudinal direction of the. A portion of the extension conductor 7 that is arranged in the direction orthogonal to the longitudinal direction and that is not covered with the first insulating film 8 is left as the first exposed portion 9.

A second exposed portion 11 is formed next to the first exposed portion 9 in the longitudinal direction of the extension conductor 7. Like the first exposed portion 9, the second exposed portion 11 is formed by covering the extension conductors 7 with every other one of the plurality of rectangular second insulating films 10, but the extended conductors 7 are covered.
And, the extending conductor 7 that is exposed is offset by one line with respect to the first exposed portion 9.

In order to carry out the insulation inspection of the anode conductor of the fluorescent display tube 1, as shown in FIG. 2, the first and second exposed portions 9 and 11 provided on the extension conductor 7 of the protrusion 6 are exposed. , And conductive rubbers 12 and 13 as conductive members are brought into contact with each other. The conductive rubbers 12 and 13 have an elongated rectangular rod shape and allow the extension conductors 7 appearing in the exposed portions 9 and 11 to conduct.

The insulation resistance between the two conductive rubbers 12 and 13 contacting the exposed portions 9 and 11 is measured. If the insulation resistance between the conductive rubbers 12 and 13 is sufficiently large, the insulation between the adjacent extension conductors 7 and 7, that is, the insulation between the adjacent wiring conductors in the envelope 5 is sufficiently maintained. Is confirmed.

Further, in the first embodiment, the insulating films 8 and 1 are
Except for the portion covered by 0, the extension conductors 7 other than the exposed portions 9 and 11 were entirely exposed on the protruding portion 6. However, as shown by the broken line in FIG. 1, the extension conductor 7 in the relevant portion may be covered with the protective insulating film 14.

After the insulation inspection of the anode conductor is completed, external lead wires 15 are soldered to the ends of the extension conductors 7 of the protrusions 6 as shown in FIG.

FIG. 3 shows a fluorescent display tube 21 of the second embodiment. In the fluorescent display tube 21, both ends of an anode substrate 23, which is a part of the envelope 22, are formed as projecting portions 24 a and 24 b protruding outward from the box-shaped outer shape of the envelope 22.

The wiring conductors formed on the anode substrate 23 in the envelope 22 are continuous with the extension conductors 25 formed on the upper surfaces of both the protruding portions 24a and 24b.
Has been outsourced.

The extension conductors 25 of one of the protrusions 24a are covered with the first insulating film 26 having a plurality of rectangular patterns every other one along the direction orthogonal to the longitudinal direction of the extension conductors. A portion that is not covered with the first insulating film 26 that is arranged in the direction orthogonal to the longitudinal direction of the extension conductor is left as the first exposed portion 27. An external lead wire 28 is soldered to the end of the extension conductor 25 left as the first exposed portion 27.

The second exposed portion 2 is formed on the other protruding portion 24b.
9 are configured. Like the first exposed portion 27, the second exposed portion 29 is formed by covering the extension conductors 25 every other one with a plurality of rectangular second insulating films 30, but the extended conductors 25 are covered. The extending conductor 25 that is exposed is offset by one line with respect to the first exposed portion 27. Second
At the end of the extension conductor 25 left as the exposed portion 29,
The external lead wire 28 is soldered.

In order to perform an insulation inspection of the anode conductor of the fluorescent display tube 21, the first projections provided on both the protruding portions 24a and 24b are used.
Conductive rubber as a conductive member is brought into contact with the second exposed portions 27 and 29, and the insulation resistance between the two conductive rubbers is measured. If the insulation resistance between both conductive rubbers is sufficiently large, it is confirmed that the insulation between adjacent extension conductors, that is, the insulation between adjacent wiring conductors in the envelope is sufficiently maintained. . The structure of the conductive rubber is the same as that of the first embodiment.

According to this embodiment, the same effect as that of the first embodiment can be obtained, and the extension conductors 25 connected to the wiring conductors are distributed to both ends of the anode substrate 23 so that the external lead wires 28 are connected. Therefore, there is an effect that the work of soldering the external lead wire 28 is easy.

In the first and second embodiments, the frit glass mixed with a pigment to form a paste is screen-printed and fired to form the insulating films 8, 10, 26, 30.
However, any material can be used as the insulating film as long as it can cover the extension conductor on the protrusion with a desired shape and has sufficient insulation.

FIG. 4 shows a fluorescent display tube 31 of the third embodiment. In the fluorescent display tube 31, both ends of the anode substrate 33, which is a part of the envelope 32, are formed as protrusions 34a and 34b protruding outward from the box-shaped outer shape of the envelope 32.

The wiring conductors arranged in parallel on the anode substrate 33 in the envelope 32 have one or the other protruding portion 34.
a and 34b are alternately extended to form a first plurality of extension conductors 35a provided on the first protrusion 34a, and a wiring conductor to which the first plurality of extension conductors 35a are connected. Are connected to different wiring conductors and are connected to the second protrusion 34b.
And a second plurality of extension conductors 35b provided in the.

In order to inspect the insulation of the anode conductor of the fluorescent display tube 31, the first projections provided on both protrusions 34a and 34b are used.
Then, a conductive rubber as a conductive member is brought into contact with each of the second extension conductors 35a and 35b, and the insulation resistance between the two conductive rubbers is measured. If the insulation resistance between both conductive rubbers is sufficiently large, it is confirmed that the insulation between adjacent extension conductors, that is, the insulation between adjacent wiring conductors in the envelope is sufficiently maintained. . The structure of the conductive rubber is the same as in the first and second embodiments.

In each of the embodiments described above, the conductive rubber is used as the conductive member, but any conductive member made of a material that surely contacts the extension conductor or the exposed portion of the extension conductor may be used. For example, a metal member may be used.

In each of the embodiments described above, the short side of the rectangular anode substrate is the protruding portion provided with the extension conductor.
The present invention is also applicable to a fluorescent display tube in which the long side is projected and the wiring conductor is drawn out. Further, not only the extension conductor connected to the wiring conductor of the anode conductor but also the fluorescent display tube having the extension conductor connected to the wiring conductor of other electrodes or the like can be similarly applied.

The wiring conductors provided on the substrate inside the envelope do not necessarily have to be a large number of straight lines (strips) arranged in parallel at a predetermined pitch. The wiring conductor may be formed in an arbitrary pattern according to the shape of the anode formed on the anode substrate.

[0037]

According to the fluorescent display tube of the present invention, the extension conductor continuous with the wiring conductor in the envelope is provided on the protruding portion of the substrate outside the envelope, and the extension conductor is the wiring conductor. Since it is divided into two different sets that are connected every other line, if you check the insulation between both conductive members by contacting each set with a conductive member, the insulation resistance between adjacent wiring conductors Can be measured.

Therefore, unlike the conventional method in which the pins are brought into contact with the respective extension conductors, even if the position of the conductive member is slightly displaced during the inspection, the measurement is not affected, and the fluorescent display tube is attached to the inspection jig. The workability is improved by eliminating the influence of the misalignment.

Further, conventionally, an inspection device having a size according to the line width and pitch of the extension conductor was required, but according to the present invention, insulation inspection can be performed regardless of the line width and pitch of the extension conductor.

[Brief description of drawings]

FIG. 1 is a partially enlarged perspective view of a phosphor display tube according to a first embodiment.

FIG. 2 is a perspective view showing a state of insulation inspection in the fluorescent display tube of the first embodiment.

FIG. 3 is a plan view of a phosphor display tube according to a second embodiment.

FIG. 4 is a plan view of a phosphor display tube according to a third embodiment.

FIG. 5 is a perspective view showing a conventional fluorescent display tube inspection method.

[Explanation of symbols]

 1, 21, 31 Fluorescent display tube 3, 23, 33 Anode substrate as a substrate 5, 22, 32 Envelope 6, 24a, 24b, 34a, 34b Projection part 7, 25, 35a, 35b Extension conductor 8, 26th 1 Insulating film 10,30 2nd insulating film 9,27 1st exposed part 11,29 2nd exposed part 14 Protective insulating film

Claims (5)

[Claims] 1. A substrate forming a part of the envelope is connected to a projecting portion projecting from the outer shape of the envelope and a plurality of wiring conductors arranged in parallel inside the envelope. A plurality of extension conductors arranged in parallel on the protrusion, and two different sets of extension conductors connected to the wiring conductors at intervals of two are respectively arranged in a predetermined direction on the protrusion. A fluorescent display tube comprising an exposed portion. 2. A projecting portion formed by projecting a substrate, which constitutes a part of the envelope, from an outer shape of the envelope, and the projecting portion connected to a plurality of wiring conductors inside the envelope. A plurality of extension conductors juxtaposed in parallel with each other, and one extension conductor in such a manner that the exposed portions of the extension conductors appearing every other along the predetermined direction are displaced from each other at two locations. A fluorescent display tube comprising: an insulating film that covers each other. 3. The fluorescent display tube according to claim 2, further comprising a protective insulating film that covers the extension conductor other than the exposed portion. 4. A first and a second projecting portion formed by projecting a substrate forming a part of the envelope at two locations from an outer shape of the envelope, and a plurality of pieces inside the envelope. Wirings different from the first plurality of extension conductors connected to the other wiring conductors and extended to the first protrusion, and the wiring conductors to which the first plurality of extension conductors are connected. Second connected to the conductor
And a second plurality of extension conductors extended to the protrusions of the fluorescent display tube. 5. A substrate forming a part of the envelope is connected to a projecting portion projecting from the outer shape of the envelope and a plurality of wiring conductors arranged side by side inside the envelope. A plurality of extension conductors arranged in parallel on the protrusion, and two different sets of extension conductors connected to the wiring conductors at intervals of two are respectively arranged in a predetermined direction on the protrusion. In a method of inspecting a fluorescent display tube that constitutes an exposed portion, by connecting the extension conductors of both sets with a common conductive member at the both exposed portions, and measuring the insulation resistance between the conductive members. A method of inspecting a fluorescent display tube for inspecting insulation between adjacent wiring conductors in an envelope.