JPS6032842B2 - Manufacturing method of color separation filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a color separation filter used in a color imaging device or the like.

Some single-tube color image devices require color separation filters with special patterns.

For example, as a color separation filter, as shown in Fig. 1, in a dyed filter consisting of multiple color filter components, such as striped green, red, and blue filter components IG, IR, and IB, partial There is a color separation filter 3 having a decolorizing part (transparent part) 2. By the way, when creating a color separation filter with such a special pattern, for example, as in the past, an organic base to be dyed is selectively dyed with green, red, and blue dyes to form striped filter components IG of each color. , IR and IB, and then simultaneously decolorizes all the dyes in the part of the filter component to be decolorized and crosses each filter component.
In such a method, a precise pattern of bleached portions 2
is not obtained. In other words, since the bleaching time (bleaching speed) of each dye is different, if three color dyes are bleached at the same time, the bleaching times will not be the same, and if the dye has a fast bleaching rate, the bleaching will progress to areas other than the bleached area. Resulting in. For example, normal green and red dyes take longer to bleach than blue dyes, so when all colors are bleached at the same time, by the time the green and red dyes are completely bleached, the blue dye has spread to areas other than the bleached area. The color is bleached, ie, so-called over-bleaching occurs, and eventually the pattern accuracy of the bleached portion deteriorates. On the other hand, when bleaching is performed by shortening the bleaching time and monitoring the dye in order to improve pattern accuracy, other dyes that require a long bleaching time cannot be completely bleached, resulting in so-called bleaching under-coloring, which deteriorates the filter characteristics of the bleaching section. In view of the above, the present invention provides a method for manufacturing a color separation filter that allows manufacturing a color separation filter having a partially decolorized portion with good pattern accuracy and filter characteristics. .

In the present invention, when manufacturing a color separation filter that is made of dyed filter components of multiple colors and has partially bleached parts (transparent parts), dyes that are difficult to bleach (bleach time is long) are pre-dyed. After forming one dyed area corresponding to a dyed filter component of a predetermined color, a portion of the dyed area to be bleached is partially bleached in advance.

This partial bleaching is carried out to the extent that the bleaching time of the remaining dye becomes the same as the bleaching time of the dye that is easiest to bleach (the bleaching time is short) among the other dyed filter components. Next, a dye that is easy to bleach is post-dyed to form another dyed area corresponding to the other dyed filter components, and then the part of this other dyed area to be bleached and the above partially bleached area are simultaneously dyed. It is designed to completely bleach the color to form a bleached area. According to this manufacturing method, all colors can be simultaneously and completely bleached without causing local over- or under-bleaching when forming bleached areas that cross or straddle each dyeing filter component, improving pattern accuracy and bleaching areas. An excellent color separation filter with good filter characteristics can be obtained.

Next, referring to FIG. 2, a case will be described in which an embodiment of the present invention is applied to manufacturing a color separation filter having the pattern shown in FIG. 1.

First, as shown in FIGS. 2A and A', a dyeing base of an organic substance, such as gelatin base 11, is deposited on, for example, a glass substrate 10, and then the gelatin base 11 is coated with a first dye that takes a long time to decolorize. The entire surface is dyed with a dye of a certain color, for example green, to form a green dyed area 12G.

Next, a photoresist mask 14 is formed on the entire surface of the green dyed base 11 except for the portion 13R where a second color, for example, red dyeing filter component is to be formed.
The green staining in the area 13R is bleached (FIGS. 2B and B').

For this decolorization, for example, an oxidation-reduction decolorization method using an aqueous solution of potassium permanganate and an aqueous solution of sodium bisulfite can be used. After bleaching, the bleached portion 13R is dyed with a red dye to form a red dyed region 12R. This stained region 12R will later become the red dyed filter component IR (FIG. 2 C and C'). It should be noted that, like the green dye, the red dye takes a long time to decolorize.Next, the red dye is selectively applied to the entire surface of the base 11, except for the area 2 to be decolorized, crossing the green and red dyed areas 12G and 12R. After applying a photoresist mask (not shown), the respective green and red stains in the portion 2 are partially bleached using the redox bleaching method described above to form partially bleached regions 15.

This partial decolorization is carried out until the decolorization conditions are met for the blue dye that will be dyed later (○ and ○ in Figure 2). Next, a photoresist mask 1 is applied to the entire surface of the base 11 except for a portion 13B where a dye filter component of the third color, for example, blue, is to be formed.
4, and the green dyeing of the portion 138 is bleached using the redox decolorization method described above (Fig. 2 E and E'), and then this portion 13B is dyed with a blue dye to obtain a blue dye. Staining area 12
form 8.

This dyeing area 12B is the blue dyeing filter component I.
B (FIG. 2, F and F'). After that,
A photoresist mask (not shown) is applied again to the entire surface of the base 11 except for the area 2 where the three colors intersect and should be bleached, and a blue dyed area 12B and green and red partially bleached areas 15 are formed.
Both are bleached according to the bleaching conditions of the blue dye.

By doing so, the parts 2 to be bleached in each of the green, red, and blue stained areas 12G, 12R, and 12B are completely and accurately bleached in a pattern, as shown in FIG. 2G and ○.
Green, red and blue dye filter components IG, IR and I
The desired color separation filter 3 having a decolorizing section 2 that partially intersects B and each color is obtained. As described above, according to the present invention, it is possible to shorten the decolorization time, post-dye the dye, partially decolorize the previously dyed parts that require a long decolorization time, and finally shorten the decolorization time. However, by simultaneously decolorizing the previously partially decolorized dye when decolorizing the dye, the above-mentioned special pattern color separation filter can be manufactured with high precision.

In the above example, the green, red, and blue dyed filter components are formed in a stripe shape, and the decolorization section 2 is provided across the stripes.
It goes without saying that the present invention can also be applied to a case where a partially decolorized portion is provided so as to span two adjacent dyed filter components.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a color separation filter applied to the present invention, Figs. are respectively shown in Figure 2A~
It is a sectional view on the aa line of G. IG, IR, and IB are green, red, and blue dyeing filter components, respectively, 2 is a decolorizing section, 3 is a color separation filter unit, 10 is a glass substrate, 11 is a base to be dyed, 12G, 12R, 12B
are green, red, and blue dyed areas, respectively, and 16 is a partially bleached area. Fig. 1 Fig. 2 A Fig. 2 A Fig. 2 8 Fig. 2 8 Fig. 2. Figure 2G Figure 2. D' Ear Ear 1 F 3Z P' G Q'

Claims (1)

[Claims] 1. When manufacturing a color separation filter that is made of dyed filter components of multiple colors and has partially bleached parts, one dyed area corresponding to a predetermined dyed filter component is formed by pre-dying with a dye that takes a long bleaching time. a step of partially decolorizing a portion of the dyed region corresponding to the decolorized portion; a step of post-dying a dye with a short decolorization time to form another dyed region corresponding to another dyed filter component; A method for manufacturing a color separation filter, comprising the step of simultaneously completely bleaching the partially bleached region and a portion of the other dyed region corresponding to the bleached portion.