JPH078945U - Fluorescent display tube - Google Patents

Abstract

(57) [Abstract] [Purpose] Even in a fluorescent display tube in which the terminal part of the external terminal is placed close to the container part and outside the substrate in order to improve the display density, the insulation inspection between the terminal parts is facilitated. To be able to do it. [Structure] The wiring 8 on the substrate 3 is covered with an insulating layer 12. The anode 16 and the grid 17 on the insulating layer are connected to the wiring through the through hole 18. There is a terminal portion 9 covered with the sealing material 7 at the end of the wiring. The inner end portion of the external terminal 10 contacts the terminal portion and is sandwiched between the substrate to be sealed and the container portion 6. The external wiring 11 provided outside the sealing material on the substrate and reaching the outer edge portion of the substrate is connected to the wiring at the terminal portion 9. Since the terminal part is close to the sealing part of the container part and is therefore covered with the sealing material, the pins 200 of the insulation inspection jig 201 can be brought into contact with the external wiring extended to the outside thereof, and Insulation inspection of each electrode can be performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention has terminals for various electrodes inside the envelope, and the inner end of an external terminal that penetrates the sealed portion of the envelope in an airtight manner is brought into contact with this terminal to bring it outside the envelope. The present invention relates to a fluorescent display tube having an electrically derivable structure.

[0002]

[Prior art]

 As shown in part by an imaginary line in FIG. 3, the envelope 101 of the fluorescent display tube 100 includes an insulating substrate 102, and a container portion 104 that is hermetically fixed to the upper surface of the substrate 102 with a sealing material 103. have.

Wirings 105 made of an aluminum thin film are provided on the inner surface of the substrate 102. An insulating layer 106 is laminated on the wiring 105 and the substrate 102. The insulating layer 106 is provided to shield light from the outer surface side of the substrate 102, protect the wiring 105, and prevent unnecessary contact / conduction in the wiring 105.

On the insulating layer 106, an anode conductor 107 and a terminal 108 for an inlaid grid are printed and formed of a conductive material. A phosphor layer 109 is provided on the anode conductor 107 to form an anode 110 as a light emitting display section. Further, a grid grid 111 is attached to the terminal 108 on the insulating layer 106. The insulating layer 106 prevents short-circuiting between the adjacent anode conductors and the terminals for the grid to be attached to each other.

Through holes 112 are formed in the insulating layer 106 at important points, and the through holes 112 are filled with a conductive paste. As a result, the anode conductor 107 is electrically connected to the corresponding wiring 105, and the inlaid grid 11 1 is also electrically connected to the corresponding wiring 105.

A terminal portion 113 is formed at the end of the wiring 105. Before assembling the envelope 101, the terminal portion 113 is covered with a sealing material 103 as shown in FIG. Then, as shown in FIG. 4, the inner end portion of the external terminal 114 is abutted against the terminal portion 113, and the container portion 104 and the substrate 102 are hermetically sealed with the sealing material 103 by sandwiching the external terminal 114. Fixed.

Meanwhile, in the manufacture of the fluorescent display tube 100, after various electrodes are formed on the substrate 102, an insulation test between the terminal portions 113 and 113 is performed. This insulation test is performed in order to confirm that each terminal portion 113 is electrically connected to a predetermined anode 110 or a grid grid 111 via a predetermined wiring 105, and is connected to another anode or grid grid. It is to check whether or not the insulation is maintained.

An insulation inspection jig 201 having a plurality of pins 200 as shown in FIG. 3 is used for the insulation inspection. The pin 200 of the jig 201 is stood between the terminal portions 113, 113 on the substrate 102, and a predetermined voltage is applied between the pins to measure the resistance. If the insulation is good, it shows a constant resistance value, but if there is any inconvenient short circuit, the resistance value will decrease, so you can tell from which resistance value the short circuit occurs. Through this inspection, defective products can be excluded from the process at the final stage just before the envelope is sealed.

[0009]

[Problems to be solved by the device]

 According to the conventional fluorescent display tube 100 having the above-described structure, in order to increase the display density in the envelope 101, the terminal portion 113 of the external terminal 114 is located on the substrate 102 as close to the outer container portion 104 as possible. Was set up in. Then, the external terminal 114 is sandwiched between the container portion 104 and the substrate 102 and is in contact with the terminal portion 113.

That is, since the terminal portion 113 on the substrate 102 and the sealed portion of the envelope 101 are close to each other, the sealing material 103 previously provided on the outer peripheral portion of the substrate 102 for sealing the container portion 104 and the substrate 102 is As shown in FIG. 3, the upper surface of the terminal portion 113 will be adhered. Therefore, there is a problem that the terminal portion 113 becomes invisible and the insulation test cannot be performed.

The present invention makes it possible to easily perform insulation inspection between terminal portions even in a fluorescent display tube in which the terminal portions of external terminals are arranged close to the container portion and arranged outside the substrate in order to improve display density. The purpose is to do so.

[0012]

[Means for Solving the Problems]

 The fluorescent display of the present invention includes an envelope in which a substrate and a container are sealed with a sealing material, wiring formed on the upper surface of the substrate in the envelope, and a container close to the container. Then, in a fluorescent display tube having a terminal portion provided at an end portion of the wiring and an external terminal penetrating the sealing material and electrically leading the terminal portion to the outside of the envelope. It is characterized in that the upper surface of the terminal portion is covered with the sealing material, and external wiring extends from the terminal portion to the outside of the sealing material on the substrate.

[0013]

[Action]

 The external wiring that conducts to the terminals covered with the sealing material is extended to the outside of the sealing material on the board, and the insulation test for measuring the resistance between the terminals is performed on the external wiring part. It can be carried out.

[0014]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the envelope 2 of the fluorescent display tube 1 is composed of an insulating substrate 3 and a lid-shaped container portion 6 composed of a side plate 4 and a front plate 5. The open lower end surface of the container portion 6 and the outer peripheral portion of the upper surface of the substrate 3 are fixed by a sealing material 7. The inside of the envelope 2 is evacuated and kept in a vacuum state.

Wirings 8 made of an aluminum thin film are provided on the inner surface of the substrate 3. To form the wiring 8, an aluminum thin film may be formed on the substrate 3 by a sputtering method or the like and processed into a desired pattern by photoetching.

In the envelope 2, a terminal portion 9 is formed at an end of the wiring 8. The terminal portion 9 is made of a conductive paste deposited on the end portion of the wiring 8. As shown in FIG. 1, in order to secure a sufficiently large display portion inside the substrate 3, this terminal portion 9 is arranged at an outer position on the substrate 3, and an inner surface of the side plate 4 of the container portion 6 is provided. Is close to. The inner end portion of the external terminal 10 contacts the terminal portion 9, and the external terminal 10 is sandwiched between the container portion 6 and the substrate 3 which are hermetically fixed by the sealing material 7. Therefore, in the board 3 before assembly shown in FIG. 2, the terminal portion 9 is covered with the sealing material 7 which is circumferentially arranged on the outer edge portion of the board 3.

An external wiring 11 extends from the terminal portion 9 to the outside of the sealing material 7 on the substrate 3. The external wiring 11 is connected to the wiring 8 at the terminal portion 9, penetrates the sealing material 7 that covers the terminal portion 9, and reaches the outer edge portion of the substrate 3. The external wiring 11 is integrally formed with the wiring 8 in the same step. The external wiring 11 is a portion for contacting the pin 200 of the insulation inspection jig 201 in the insulation inspection, and its pattern can be arbitrarily determined. That is, it may be formed linearly in a continuous shape with the wiring 8, or may be formed by bending in a predetermined direction according to the convenience of the insulation inspection.

An insulating layer 12 is laminated on the wiring 8 and the substrate 3. The insulating layer 12 is provided to block light incident from the outer surface side of the substrate 3, protect the wiring 8, and prevent unnecessary contact / conduction in the wiring 8.

On the insulating layer 12, an anode conductor 13 and terminals 14 for an inlaid grid are formed by printing. The anode conductor 13 is made of a conductive material such as graphite. A phosphor layer 15 is provided on the anode conductor 13 to form an anode 16 as a light emitting display section. The terminal 14 for the inlaid grid is made of a conductive paste containing silver and is formed in the same process as the terminal portion 9. An insole grid 17 is attached to the terminal 14 on the insulating layer 12. The insulating layer 12 prevents short-circuiting between the adjacent anode conductors and the terminals for the inlaid grid.

Through holes 18 are formed in the insulating layer 12 at important points, and the through holes 18 are filled with a conductive paste. As a result, the anode conductor 13 is electrically connected to the corresponding wiring 8 and the inlaid grid 17 is also electrically connected to the corresponding wiring 8.

A linear cathode 19 which is an electron source is provided above the inlaid grid 17. The various electrodes and the like are housed in the envelope 2 and are electrically led out of the envelope 2 by the external terminals 10 that hermetically penetrate the sealed portion of the envelope 2.

According to the above configuration, after the electrodes such as the anode 16 and the grid grid 17 are formed on the substrate 3, and the sealing material 7 is applied to the outer peripheral portion of the substrate 3 by the printing method, Insulation inspection of the substrate 3 can be performed.

As shown in FIG. 2, when the sealing material 7 is applied to the outer peripheral portion of the completed substrate 3, the sealing material 7 covers the terminal portion 9. However, since the external wiring 11 that conducts to the wiring 8 is provided on the substrate 3 outside the sealing material 7, the pin 200 of the insulation inspection jig 201 is applied to the external wiring 11 instead of the terminal portion 9. Insulation inspection can be performed by touching.

In the above configuration, when the outer shape of the substrate 3 having the external wiring 11 is slightly larger than the outer shape of the container part 6, the insulation inspection of the substrate 3 is completed and the container part 6 is attached to the substrate 3. After sealing, a part of the substrate 3 protruding outward from the side plate 4 of the container 6 may be cut and removed.

[0025]

[Effect of device]

 The fluorescent display tube of the present invention is a fluorescent display tube in which the terminal portion of the external terminal is arranged on the outside of the substrate so as to be close to the inner surface of the container portion in order to improve the display density, but it is covered with the sealing material. Since the external wiring that conducts to the terminals is extended to a position outside the sealing material on the board, the insulation between the external wiring is checked so that the terminals are covered by the sealing material. However, there is an effect that it is possible to easily carry out an insulation inspection of the electrodes and wirings formed on the substrate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fluorescent display tube according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing insulation inspection of a substrate in a manufacturing process of a fluorescent display tube which is an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing an insulation inspection of a substrate in a conventional manufacturing process of a fluorescent display tube.

FIG. 4 is an enlarged cross-sectional view of a sealed portion of an envelope in a conventional fluorescent display tube.

[Explanation of symbols]

 1 Fluorescent Display Tube 2 Envelope 3 Substrate 6 Container 7 Sealing Material 8 Wiring 9 Terminal 10 External Terminal 11 External Wiring

Claims (1)

[Scope of utility model registration request] 1. An envelope in which a substrate and a container are sealed with a sealing material, wiring formed on the upper surface of the substrate in the envelope, and the container close to the container. In a fluorescent display tube having a terminal portion provided at an end portion of the wiring and an external terminal penetrating the sealing material to electrically lead the terminal portion to the outside of the envelope, A fluorescent display tube, wherein an upper surface is covered with the sealing material, and external wiring extends from the terminal portion to the outside of the sealing material on the substrate.