JP3019944U - Fluorescent display tube - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a phosphor layer that does not require through-hole alignment of the insulating layer and has good positional accuracy and good shape. [Structure] The first insulating layer 13 is formed in the formation region of the phosphor layer 8.
Of the first insulating layer 13 and the second insulating layer 15 is a through layer of the first insulating layer 13 in the formation region of the metal electrode 10. It is formed with an opening 14a having an opening diameter larger than that of the hole 12a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fluorescent display tube having an anode substrate structure in which a wiring pattern, an insulating layer and a phosphor layer are formed on an insulating substrate, and more particularly to a laminated structure of insulating layers.

[0002]

[Prior art]

 FIG. 2 is an enlarged sectional view of an essential part showing the structure of an anode substrate applied to a conventional fluorescent display tube. In FIG. 2, thin film electrode wiring patterns 2 and anode patterns 3 are selectively deposited on the surface of a glass substrate 1. The first insulating layer 5 having through holes 4 a and 4 b at positions corresponding to the wiring pattern 2 and the anode pattern 3 is formed on the entire surface of the glass substrate 1 including the wiring pattern 2 and the anode pattern 3. Also, the second insulating layer 7 having the through holes 6a and 6b is sequentially laminated by connecting the vertical through holes.

Further, a phosphor layer 8 is deposited on the communicating through holes 4 b and 6 b corresponding to the anode pattern 3 to form an anode substrate 9. Further, a metal electrode 10 such as a filament support or a grid is bonded and arranged by a conductive paste 11 on the through holes 4a and 6a communicating with each other corresponding to the wiring pattern 2 of the anode substrate 9 and electrically connected. It is connected.

In this case, the insulating layer for stacking the first insulating layer 5 and the second insulating layer 7 on the glass substrate 1 has a two-layer structure (or a three-layer structure or more). The conductive paste 11 injected into the through holes 4a and 6a communicating with each other for connection with the wiring pattern 2 when the wiring density becomes high increases the total thickness of the insulating layer and increases the thickness of the holes. Since the depth becomes deeper, it is prevented from protruding outside the hole and coming into contact with another wiring pattern (not shown) adjacent to the hole or the like to cause a short circuit.

[0005]

[Problems to be solved by the device]

 However, since the anode substrate 9 configured in this way has a laminated structure of two or more insulating layers, it has the following problems. Since the vertical alignment accuracy of each through hole formed in communication with the stacked body of the first insulating layer 5 and the second insulating layer 7 is required, the manufacturing process becomes complicated. When the phosphor layer 8 is formed, the entire thickness of the first insulating layer 5 and the second insulating layer 7 is large, so the phosphor does not sufficiently enter the through holes 4b and 6b that communicate with each other, and the phosphor layer 8 causes a defective shape.

Therefore, the present invention has been made in order to solve the above-mentioned conventional problems, and the purpose thereof is to eliminate the need for through-hole alignment of the insulating layer, and to improve the positional accuracy and shape. It is to provide a fluorescent display tube in which a phosphor layer is obtained.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention has a two-layer structure of an insulating layer formed on an insulating substrate, the first layer covers almost the entire surface of the insulating substrate, and the second layer is a phosphor layer. The coating is applied to the portion other than the formation area of the.

[0008]

[Action]

 In the present invention, since the phosphor layer forming region has only one insulating layer, no alignment is required, so that the phosphor layer does not have a defective shape.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of an essential part of an anode substrate for explaining a structure of an embodiment of a fluorescent display tube according to the present invention based on a manufacturing method. The same parts as those in FIG. 2 described above are designated by the same reference numerals. . In FIG. 1, an Al thin film having a thickness of 1.2 μm is formed by a sputtering method on the glass substrate 1 cut and washed to 30 × 120 × 1.2 t (m / m), and photoetching The wiring pattern 2 and the anode pattern 3 having predetermined dimensions are formed by the method.

Further, on the glass substrate 1, an insulating paste containing a low melting point frit glass and a photosensitive liquid as main components is applied over the entire surface, dried, and then applied to the wiring pattern 2 and the positive electrode pattern 3. A predetermined pattern is exposed, developed, and baked at the respective positions to form the first insulating layer 13 having the through holes 12a and 12b.

Similar to the first insulating layer 13, the first insulating layer 13 has a region other than the region where the phosphor layer 8 is formed in a region where the metal electrode 10 such as a filament support or a grid is formed. The second insulating layer 15 having an opening 14a having a larger opening diameter than the through hole 12a is formed in a frame shape by communicating the opening 14a with the through hole 12a. . The second insulating layer 15 having the opening 14a may be formed by, for example, a screen printing method.

Further, the phosphor layer 8 is formed in the through hole 12 b formed in the first insulating layer 13 to form the anode substrate 9 A. Further, a metal electrode 10 such as a filament support or a grid is bonded and arranged by a conductive paste 11 to the through hole 12a and the opening 14a which are communicated with each other on the anode substrate 9A, and they are electrically connected.

In such a configuration, only the first insulating layer 13 is formed in the peripheral portion of the phosphor layer 8 and the thickness thereof is thin, and the step difference is small. The body can sufficiently enter, therefore the phosphor layer 8 can be easily formed, and a phosphor screen having a good shape can be formed.

Here, the first insulating layer 13 has a thickness of about 8 μm after firing, and has a thickness of a conventional insulating layer (thickness of the first insulating layer 5 and the second insulating layer 7). (Added value) of about 15 μm or more, the phosphor layer 8 can be easily formed, and its shape is also good.

Further, in such a configuration, the opening 14a of the second insulating layer 15 communicating with the through hole 12a of the first insulating layer 13 has an opening diameter larger than that of the through hole 12a. Since the conductive paste 11 is formed, it is difficult for the conductive paste 11 to protrude to the outside, and it is possible to prevent the occurrence of a short circuit due to contact with another adjacent wiring pattern (not shown).

[0016]

[Effect of device]

 As described above, according to the present invention, since the thickness of the insulating layer in the phosphor layer forming region becomes thin, it is possible to form a phosphor layer having good positional accuracy and good shape, which is extremely excellent. The effect is obtained. Further, since the insulating layer in the peripheral portion of the phosphor layer is one layer, there is no need for alignment as in the conventional case, and extremely excellent effects such as simplification of the manufacturing process can be obtained.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing a structure of an anode substrate of a fluorescent display tube according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part showing a configuration of an anode substrate of a conventional fluorescent display tube.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Glass substrate, 2 ... Wiring pattern, 3 ... Anode pattern, 8 ... Phosphor layer, 9A ... Anode substrate, 10 ... Metal electrode,
11 ... Conductive paste, 12a, 12b ... Through hole, 13 ... First insulating layer, 14a ... Opening, 15 ... Second
Insulation layer.

Claims (1)

[Scope of utility model registration request] 1. A fluorescent display tube having an anode substrate structure in which a wiring pattern, an insulating layer and a phosphor layer are formed on an insulating substrate, wherein the insulating layer has a two-layer structure consisting of a first layer and a second layer. A first layer of the insulating layer covers substantially the entire surface of the insulating substrate, and a second layer of the insulating layer covers a portion other than a region where the phosphor layer is formed. tube.