JPS63265842A - Production of condensing lens plate for gas discharge display panel - Google Patents

Abstract

PURPOSE:To produce the title lens plate with excellent display luminance by etching a transparent substrate with a resist layer formed on the substrate as a mask, and then forming a ground condensing lens. CONSTITUTION:The resist layers 3a and 3b of a dot matrix shape having 0.4-0.6mm dot diameter and 0.6-0.8mm dot pitch are formed on both surfaces of the transparent substrate 2 consisting of glass and having 0.2-0.4mm thickness in the pattern corresponding to the discharge cell arrangement pattern. The transparent substrate 2 is etched with the resist layers 3a and 3b as a mask, and protrusions 4a and 4b having an almost trapezoidal cross section are formed on both surfaces of the substrate 2 at the part corresponding to the discharge cell. After the resist layers 3a and 3b of the substrate 2 are removed, the substrate is dipped in a grinding soln. having a lower concn. than the etching soln. and chemically ground to round off the angles of the protrusions 4a and 4b, and condensing lenses 5a and 5b having the same focal distance are formed on both surfaces of the substrate 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a condenser lens plate that is incorporated into a gas discharge display panel and used in order to improve the display brightness of the panel. The present invention relates to a method of manufacturing a condensing lens plate for a gas discharge display panel in which a condensing lens is formed in a portion corresponding to a discharge cell by etching a transparent substrate.

[Prior Art] Conventionally, this kind of gas discharge display panel has a front substrate and a rear substrate made of glass facing each other at a predetermined interval to form an airtight envelope, and a gas discharge display panel has a front substrate and a rear substrate made of glass facing each other at a predetermined interval to form an airtight envelope. , has a structure in which a plurality of cathodes and anodes facing each other across a discharge gap are sealed together with a discharge gas. Further, discharge cells are formed in the opposing portions of the cathode and anode, and these cells are arranged in a predetermined pattern depending on the type of gas discharge display panel.

When a voltage is selectively applied between the cathode and anode, the discharge cell in the opposing portion of the selected cathode and anode is discharged, and the emitted light is emitted to the outside through the front substrate to produce the desired effect. A display pattern is formed.

[Problems to be Solved by the Invention] By the way, since the above-mentioned front substrate is a main component of the airtight envelope, it needs mechanical strength, and a relatively thick one of about several m1 is used. . Therefore, there is a problem in that a portion of the light from the discharge cells is diffused into the inside of the front substrate while passing through the front substrate, and display brightness is lowered due to a decrease in the amount of light emitted from the front substrate to the outside.

The present invention has been devised in view of the above points, and is a condensing lens that is used by being incorporated into a panel in order to condense light from discharge cells and suppress the diffusion of light inside the front substrate. The purpose is to realize a method for manufacturing plates.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the method for manufacturing a condensing lens plate for a gas discharge display panel of the present invention includes a resist having a pattern corresponding to a discharge cell arrangement pattern of a gas discharge display panel. 1) 5 is formed on a transparent substrate, the transparent substrate is etched using the resist layer as a mask, and the surface of the transparent substrate is polished to form a condenser lens in the portion corresponding to the discharge cell. That is.

[Function] Since the method of the present invention has the above-described configuration, the resist layer is formed by etching the portion of the transparent substrate where the resist layer is not formed and the peripheral portion of the portion where the resist layer is formed. The central part of the removed part remains as a protrusion. Further, by polishing, the corners of the protrusions are worn away, the entire substrate is made transparent, and convex condensing lenses are formed in the portions of the transparent substrate corresponding to the discharge cells.

Therefore, if this condensing lens plate is disposed between the discharge cells and the front substrate of the gas discharge display panel, the light from the discharge cells will be condensed by the condensing lenses formed on the transparent substrate. The light enters the front substrate and is emitted to the outside without being diffused within the substrate.

[Example] Hereinafter, a method for manufacturing a condenser lens plate for a gas discharge display panel according to an example of the present invention will be described based on the drawings.

[Example 1] This example is applied to a matrix-type gas discharge display panel, and the manufacturing process is shown in Figure 1 (
Shown in A) to (E).

When manufacturing the condensing lens plate 1 for a gas discharge display panel, first, as shown in FIGS. 1(A) and (B), a thickness of 0.2
to Q, resist layers 3a and 3b are respectively formed on both sides of a transparent substrate 2 made of thin plate glass of about 4 mm in a pattern corresponding to the discharge cell arrangement pattern of the gas discharge display panel. That is, a photosensitive etching-resistant material such as polybiphenyl alcohol resin is coated with a dot diameter of 0.4 to 0.6.
The resist layers 3a and 3b are deposited in a dot matrix shape with a dot pitch of about 0.6 to 0.8 m by means of screen printing or the like. In this case, since the condensing lens plate l is placed in close proximity to the part where electric discharge occurs, the material of the transparent substrate that is its constituent material must be inorganic, and from the viewpoint of transparency, the above-mentioned glass is preferable. Optimal.

Next, the transparent substrate 2 on which the resist layers 3a and 3b are formed is immersed in an etching solution such as hydrofluoric acid to perform chemical etching. Since the etching effect of chemical etching is isotropic, if over-etching is performed intentionally, the resist layer 3a of the transparent substrate 2 will be damaged.

Not only the portion where resist layer 3b is not formed, but also the portion where resist layer 3b is not formed.
The etching action also progresses from the lateral direction on the portions where numerals a and 3b are formed, and protrusions having a substantially trapezoidal cross section as shown in FIG. 4a and 4b are formed.

After that, the resists N3a and 3b on the transparent substrate 2 are removed with xylene or the like, and then chemically polished by immersing them in a polishing solution made of hydrofluoric acid or the like having a lower concentration than the etching solution, as shown in FIG. 1(D). As shown in (E), the corners of the protrusions 4a and 4b are worn away, and convex condensing lenses 5a and 5b with equal focal lengths are formed on both sides of the substrate 2, respectively, and the substrate roughened by etching is removed. The surface of 2 becomes smooth and the transparency improves.

When manufacturing the condensing lens plate I, the degree of etching of the substrate 2 is appropriately controlled by selecting the thickness of the transparent substrate 2, the dot diameter of the resist layers 3a and 3b, and the etching solution concentration, temperature, etching time, etc. By setting
It is possible to obtain condensing lenses 5a and 5b having a thickness, diameter, and focal length that are compatible with the gas discharge display panel used.

As shown in FIG. 2, the condensing lens plate 1 for a gas discharge display panel is placed in an airtight container formed with a front substrate 6 and a rear substrate 7 made of glass slopes facing each other at a predetermined interval, with a discharge gap in between. The gas discharge display panel 10 is arranged between the front substrate 6 and the cathode 8 in a gas discharge display panel 10, which is constructed by sealing a plurality of cathodes 8 and anodes 9, which are disposed orthogonally facing each other, together with a discharge gas.

When a voltage is applied between the selected cathode 8 and anode 9, the discharge cell 1) formed between the two electrodes 8 and 9 discharges, and the light is focused on the condenser lens plate 1. The light is focused by the lenses 5a and 5b, enters the front substrate 6, and is emitted to the outside.

[Embodiment 2] FIG. 3 shows another embodiment of the present invention, in which a condenser lens 5a formed on the upper surface and a lower surface of the transparent substrate 2,
5b have different diameters and their focal lengths are different from each other.

In this embodiment, as shown in FIG. 3(A), a resist layer 3a having a large dot diameter is first formed on the upper surface of the transparent substrate 2.
A resist layer 3b with a small dot diameter is formed in a matrix on the lower surface, and chemical etching is performed on this resist layer 3b as shown in Fig. 3 (B).
), a large-diameter protrusion 4a and a small-diameter protrusion 4b are formed on the upper and lower surfaces of the transparent substrate 2, respectively.
After removing the resists N3a and 3b formed on the transparent substrate 2, the protrusions 4a and 4b are rounded and made transparent by chemical polishing, and a large diameter convex condenser lens 5a is formed on the upper surface of the substrate 2.
, a small diameter convex condenser lens 5b is formed on the lower surface.

[Embodiment 3] FIG. 4 shows still another embodiment of the present invention, in which a condenser lens 5a is formed only on the upper surface of the transparent substrate 2.

In this embodiment, as shown in FIG. 4(A), a dot-shaped resist layer 3a is first formed in a matrix on the upper surface of the transparent substrate 2, and a resist layer 3b is formed on the entire lower surface of the transparent substrate 2. Cover with Next, this is chemically etched to form protrusions 4a on the upper surface of the transparent substrate 2, as shown in FIG. 4(B). After that, resist layers 3a, 3
b is removed and the protrusions 4a are rounded and made transparent by chemical polishing, thereby forming a convex condensing lens 5a on the upper surface of the transparent substrate 2.

[Example 4] In the example described above, a method for manufacturing a condensing lens plate used in a donmatrix type discharge display panel was shown, but this example is suitable for a Hargraph type gas discharge display panel. It is something.

In the case of this embodiment, first a resist layer is formed in stripes on the upper surface of the transparent substrate 2, the entire lower surface is covered with the resist layer and chemically etched, and then the resist layer is removed and chemically polished. As shown in Figure 5, the transparent substrate 2
A condensing lens plate 1 having a large number of semicylindrical condensing lenses 5a arranged in parallel on the upper surface is obtained.

[Effects of the Invention] As described in detail above, the method for manufacturing a condensing lens plate for a gas discharge display panel of the present invention involves forming a resist Fi on a transparent substrate, etching it, and then polishing the transparent substrate. Since a condensing lens is formed in the part corresponding to the discharge cell,
A condensing lens plate can be easily obtained by simply selecting appropriate notching conditions: the thickness of the transparent substrate, the pattern shape and processing of the resist layer. If the condensing lens plate manufactured by the method of the present invention is installed between the front substrate and the cathode of a gas discharge display panel, the light from the discharge cell will be emitted to the outside with almost no loss, so that the gas It becomes possible to improve the display brightness of the discharge display panel.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the method of the present invention, FIGS. 1(B) to (D) are cross-sectional views for explaining the manufacturing process, and FIGS. 1(A) and (E) are sectional views for explaining the manufacturing process. , FIG. 2 is an exploded perspective view showing a state where the condenser lens plate is assembled into a gas discharge display panel, and FIGS. (C) is a cross-sectional view for explaining the manufacturing process of another example, FIGS. 4(A) to (C) are cross-sectional views for explaining the manufacturing process of still another example, and FIG. The figure is a perspective view showing an example of the shape of a condensing lens plate. DESCRIPTION OF SYMBOLS 1... Condenser lens for gas discharge display panels, 2... Transparent substrate, 3a, 3b... Resist layer, 4a, 4b...
-Protrusions, 5a, 5b...Condenser lens, 10...Gas discharge display panel, 1)...Discharge cell.

Claims (5)

[Claims] (1) A resist layer having a pattern corresponding to the discharge cell arrangement pattern of a gas discharge display panel is formed on a transparent substrate, the transparent substrate is etched using the resist layer as a mask, and the surface of the transparent substrate is polished. A method for manufacturing a condensing lens plate for a gas discharge display panel, characterized in that a condensing lens is formed in the portion corresponding to the discharge cell. (2) The method for manufacturing a condensing lens plate for a gas discharge display panel according to claim 1, wherein condensing lenses are formed on both sides of the transparent substrate. (3) The method for manufacturing a condenser lens plate for a gas discharge display panel according to claim 2, characterized in that the focal lengths of the condenser lenses formed on both sides of the transparent substrate are made equal to each other. (4) The method for manufacturing a condenser lens plate for a gas discharge display panel according to claim 2, wherein the condenser lenses formed on both sides of the transparent substrate have different focal lengths. (5) A method for manufacturing a condensing lens plate for a gas discharge display panel according to claim 1, characterized in that a condensing lens is formed on one side of a transparent substrate. (6) A condenser lens plate for a gas discharge display panel according to any one of claims 1 to 5, wherein the resist layer is formed in a pattern in which a plurality of dots are arranged in a matrix. manufacturing method. (7) The condensing lens for a gas discharge display panel according to any one of claims 1 to 5, wherein the resist layer is formed in a pattern in which a plurality of bands are arranged in parallel.