JPH0588013A - Production of multicolor optical filter - Google Patents

Abstract

PURPOSE:To obtain the multicolor optical filter having a prescribed resolution and the sharp edges of patterns by subjecting the silver halide emulsion layer on a substrate to photoirradiation, developing and fixing, thereby forming a black pattern consisting of silver. CONSTITUTION:An emulsion 2 consisting of a binder and silver halide is applied on a transparent base 1 and is dried; thereafter, the emulsion is exposed by irradiation with light to the shape of the pattern to be obtd. This emulsion is then developed and fixed. Red, green and blue patterns are formed on the black pattern obtd. in such a manner, by which the multicolor optical filter is obtd. Namely, the emulsion 2 consisting of the silver halide and the binder is applied on the transparent base 1 and is irradiated with the patterned light, by which the silver halide is activated and a latent image is formed. The latent image is made into metallic silver 7 by development. The silver halide of the unexposed parts is removed by fixing and only the binder remains and the black pattern is obtd. Since the black pattern is the metallic silver, the resolution is as high as <=10mum and the sharp edges are obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor optical filter used for a color image pickup tube, a color solid-state image pickup device and the like.

[0002]

2. Description of the Related Art A multicolor optical filter having a multicolor stripe shape or a multicolor mosaic shape is used for a color image pickup tube and a color solid-state image pickup element. The filter used at this time is usually three colors of red, green, and blue, which are regularly arranged in a stripe pattern. In addition to these three colors, a black pattern formed in a grid pattern is generally widely used. Has been.

This multicolor optical filter is obtained by printing black, red, green and blue patterns on a transparent support or by vapor-depositing chromium or the like on the transparent support by a sputtering method or the like. This is etched into the desired black pattern to form a black pattern. Next, a paste consisting of red, green, and blue dyes or pigments and a binder is printed, or red, green, and blue are placed on the transparent support.
It is prepared by applying a polymer material containing blue and green dyes, applying photoresist, pattern exposure with precise mask alignment, developing etching, coloring or bleaching, and then removing the photoresist. ing.

[0004]

However, the red, green,
When all blue and black are formed by the printing method, the black pattern requires a developing degree of 20 μm, but in the printing methods such as intaglio and letterpress, 20 μm is the limit value in the experimental stage, and thus it is produced at the production site. The black pattern has a high defect rate. Further, in the printing method, it is difficult to obtain a clear pattern because the edge portion of the pattern does not easily become a straight line. Further, in the method of depositing chrome on a transparent support and then etching this to form a black pattern, and then forming red, green and blue patterns on this, the resolution in the black pattern and the linearity of the edge part are There is no problem. However, when forming a black pattern, chromium is deposited on the transparent support in a vacuum by sputtering, etc., then a resist is applied, and this is exposed and then etched, but these are very complicated and production efficiency is high. Is dropping. Further, in the latter method, chromium becomes a convex surface on the transparent support, which causes the flatness of the filter surface to deteriorate.

Therefore, the object of the present invention is to simplify the process,
It is intended to provide a method for producing a multicolor optical filter using a method for producing a black pattern in which a resolution of 0 μm or more can be obtained, a pattern edge is sharp, and the flatness of the filter surface is not deteriorated.

[0006]

According to the present invention, a transparent support is coated with an emulsion comprising a binder and silver halide, dried, and then exposed to light in a pattern to be obtained and then developed. ， Red on the black pattern obtained by fixing,
A green and blue pattern is formed to obtain a multicolor optical filter.

[0007]

In the present invention, a silver halide and a binder are coated on a transparent support, and the silver halide is activated by irradiation with patterned light to form a latent image. The latent image becomes metallic silver by developing. Further, the silver halide in the unexposed portion is only the binder removed by fixing, and a black pattern can be obtained as described above. Since the black pattern at this time is metallic silver, the resolution can be 10 μm or less and the edge can be sharpened. Further, since the binder remains in areas other than the black portion, the surface of the black pattern layer formed by using the emulsion is very uniform. Therefore, by using this, a multicolor optical filter having a very uniform surface can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing a method for producing a multicolor optical filter according to the present invention. Hereinafter, a method for manufacturing the multicolor optical filter will be described with reference to FIG. First, 8 g of potassium bromide and 0.3 g of potassium iodide were placed on the glass substrate 1.
g and 20 g of gelatin are dissolved in 60 ml of water, and a silver bromide emulsion obtained by mixing 100 ml of solution B which is a 0.1 moUl silver nitrate aqueous solution is coated to obtain emulsion layer 2 (FIG. 1A). This is dried in an atmosphere at 60 ° C. as shown in FIG. 1B. After that, the light of the light source 4 is patterned and irradiated using the mask 3 in a black pattern shape to be obtained as shown in FIG. 1C. The portion irradiated with this light is excited by silver halide to form a latent image and becomes the latent image forming portion 5. As shown in FIG. 1D, this was a solution A obtained by dissolving 1.25 g of hydroquinone, 1.25 g of bisulfite and 1.25 g of potassium bromide in 50 ml of water,
Processing is carried out in the developer 6 obtained by mixing the solution B obtained by dissolving 1.25 g of sodium hydroxide in 50 ml of water. As a result, the latent image in the latent image forming section 5 becomes metallic silver 7. After washing with water, it is treated in a fixing agent 8 obtained by dissolving 25 g of sodium thiosulfate (pentahydrate) in 100 ml of water as shown in FIG. 1E. As a result, the silver bromide in the emulsion layer 2 in the non-irradiated area is melted to become the binder area 9 consisting of gelatin only. Next, this is washed with water and dried, and then a red pattern 10, a green pattern 11 and a blue pattern 12 are formed as shown in FIG. 1F, whereby a multicolor optical filter 13 can be obtained.

In this example, after the emulsion was coated on the transparent support, a black pattern was formed, and then a red pattern, a green pattern and a blue pattern were provided. However, a red pattern, a green pattern and a blue pattern were provided on the transparent support. After providing the pattern, the emulsion may be applied to form a black pattern. Further, in this embodiment, gelatin was used as the binder of the emulsion, but polyvinyl alcohol, polyvinylpyrrolidinone, or the like may be used. Further, silver chloride or silver iodide may be used as the silver halide in the emulsion.

[0010]

As described above, according to the present invention, an emulsion comprising a binder and silver halide is coated on a transparent support to form an emulsion layer, and the emulsion layer is irradiated with light to develop the pattern. Fixing is performed to form a black pattern, and red, green, and blue patterns are provided on the black pattern to fabricate a multicolor optical filter. The black pattern at this time is 10 with metallic silver.
The pattern edge portion was also sharp. The surface of the black pattern is also very uniform, ± 0.1 μm
Met. In addition, there is no defect rate in the black pattern formation, and the number of steps is simplified to 1/2 compared with the conventional method of etching the chromium to obtain the black pattern, and as a result, the production efficiency can be improved. became.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the steps of a method for producing a multicolor optical filter in an example of the present invention.

[Explanation of symbols]

 1 Substrate 2 Emulsion Layer 3 Mask 4 Light Source 5 Latent Image Forming Part 6 Developer 7 Metal Silver 8 Fixing Agent 9 Binder Part 10 Red Pattern 11 Green Pattern 12 Blue Pattern 13 Multicolor Optical Filter

Claims (1)

[Claims] 1. A silver obtained by providing an emulsion layer comprising a binder and silver halide on a substrate, irradiating the same with a black pattern to be obtained, and then developing and fixing the same. A method for producing a multicolor optical filter using a black pattern.