JPS62160639A - Face plate with color separation filter for monotube type camera tube and manufacture thereof - Google Patents

Abstract

PURPOSE:To make pollution due to emission gas out of an adhesive layer of a photoconductive film supressible, by setting thickness of the adhesive layer to be thinner than that of a substrate central part at the peripheral part of a glass substrate, for example, less than one a half. CONSTITUTION:After forming a color separation strip filter 2 on a glass substrate 1, if an organic adhesive agent 4 is applied, this agent 4 flows to be thicker at the central part of the glass substrate 1 but thiner at the peripheral part, thus an adhesive layer 4a approximate to the desired thickness distribution is formed there. Next, filter protective sheet glass 3 is bent to some extent so as to keep a form of this adhesive layer 4a intact, making it adhere to the substrate, and finally an outer surface of the sheet glass 3 is polished whereby it is finished up to such sheet glass 3a that comes to a plane surface in its outer surface. With this constitution, an interval in a peripheral part of the glass substrate 1 between the glass substrate 1 and the protective sheet glass 3 becomes narrowed, whereby a gas quantity to be emitted during evaporation forming work for a target part is reducible.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is a single-tube type in which a color separation filter has already been formed on a glass substrate, and a thin glass plate for protection is bonded onto the filter and the glass substrate. When forming a photoconductive film, etc. on the surface of the glass substrate of the VTR image pickup tube face plate opposite to the filter, the adhesive layer between the glass substrate and the glass thin plate is heated during the process of forming the photoconductive film, etc. The present invention relates to a face plate with a color separation filter for a single-tube type image pickup tube, which reduces the amount of gas released and suppresses contamination of a photoconductive film by the gas, and a method for manufacturing the same.

<Conventional technology> Color VTR cameras (so-called video cameras) for home use, which are most important to be small, lightweight, and easy to handle, use a face plate with a photoconductive film for photoelectric conversion formed on its inner surface. A so-called single-tube color image pickup tube is used in which a striped color separation filter is formed on the outer surface of the tube.

The above color separation filter is formed on the outer surface of the glass substrate of the face plate, and is usually made of organic material, which is not very strong mechanically or chemically, so it is attached to the glass substrate and on top of it. The outside of the color separation filter is protected by covering it with a thin plate of glass bonded with an adhesive (Proceedings of the 6th National Conference of Television Technology Society, p. 59).

FIG. 2 shows a side sectional view of such a conventionally used face plate with a color separation filter for a single-tube type image pickup tube. In the figure,
1 is a transparent glass substrate, 2 is a color separation stripe filter, 3 is a transparent thin plate glass for protecting the filter, and 4 is an adhesive layer (adhesive).

In order to function as a face plate, a so-called target portion made of a transparent electrode or a photoconductive film that controls photoelectric conversion must be formed on the inside of the face plate, that is, on the surface of the glass substrate opposite to the filter. During the process of forming a photoconductive film (usually by vapor deposition), the temperature of the glass substrate rises considerably, so that gas is released from the adhesive layer 4 (hardened organic adhesive) and this gas increases during the formation process. This is an accident in which the photoconductive film of the camera is contaminated and its characteristics deteriorate, causing the video signal obtained by the photoelectric conversion action of the photoconductive film to display a dirty image on the screen of the television receiver. There was a problem of inviting

<Problems to be Solved by the Invention> The present invention provides that the photoconductive film of the face plate with the color separation filter of the conventional single-tube image pickup tube, as described above, is
The purpose of the present invention is to prevent contamination caused by gas emission from a protective thin glass adhesive layer and to solve the problem of an accident in which a dirty image is displayed.

Means for Solving the Problems> In order to solve the above problems, in the present invention, when forming a target portion on the back surface of the glass substrate of the face plate, a thin plate for protecting the color separation filter on the surface of the glass substrate is removed. We decided to reduce gas emission from the glass adhesive layer and reduce gas contamination of the photoconductive film. Specifically, it was decided that the thickness of the adhesive layer at the periphery of the glass substrate is thinner than at the center of the substrate, for example, 1/2 or less.

In addition, in order to make the thickness of the adhesive layer thicker at the center of the face plate (glass substrate) and thinner at the periphery as described above, the thin glass for filter protection must be made so that the adhesive layer has the desired thickness. It is easier to do the gluing work by bending the However, if the surface of the thin glass covering the surface of the face plate remains curved, distortion will occur in the image of the subject formed by the optical system on the target section on the back of the face plate, so after the bonding process, the outer surface of the thin glass is polished. to make a flat surface.

<Function> Since the gas emitted from the adhesive layer cannot pass through the glass substrate or the thin glass plate for protecting the filter, the gap between the glass substrate and the thin glass plate for protection, which serves as an outlet for the emitted gas, should be narrowed around the glass substrate. For example, it is possible to reduce the amount of gas emitted from a target portion made of a transparent electrode or a photoconductive film during the vapor deposition process, and therefore, contamination of the photoconductive film by this gas can also be reduced.

<Embodiment> FIG. 1 shows a side sectional view of a face plate according to an embodiment of the present invention, and in the figure,
1 is a translucent glass substrate, 2 is a color separation filter, 3a is a translucent thin plate glass for protecting the filter according to the present invention, and 4a is an adhesive layer that is thick in the center and thin in the periphery according to the present invention.

FIG. 3 is an explanatory diagram of the method for manufacturing the face plate of the present invention. first,
As shown in Figure (a), after forming a color separation stripe filter on a glass substrate 1 (usually by pasting an organic filter film), an organic adhesive 4 is applied (dropped as shown). Then, as shown in Figure (b), the adhesive flows thicker at the center of the glass substrate 1 and thinner at the periphery, forming an adhesive layer 4a having a thickness distribution close to the desired one. Next, as shown in FIG. ,
(can be deformed quite freely). Finally, the outer surface of the thin glass 3 is polished and
), the thin glass 3 whose outer surface is flat
Finish to a.

<Effects of the Invention> As explained above, according to the present invention, contamination due to gas released from the adhesive layer of the photoconductive film formed on the back surface of the face plate is suppressed, and single-tube image pickup tubes with good image quality can be obtained at a high yield. You will be able to do it.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of a face plate according to an embodiment of the present invention, Fig. 2 is a side sectional view of a conventional face plate with a color separation filter, and Figs.
(d) is an explanatory diagram of a method for manufacturing the face plate of the present invention. 1-i3 optical glass substrate, 2-color separation strip drive filter, 3-.-transparent thin plate glass, 3a-thin glass according to the present invention, one side of which has been made flat by polishing, 4
-Adhesive layer, 4a-An adhesive layer that is thicker at the center and thinner at the periphery of the substrate according to the present invention. Agent Patent Attorney Katsuma Ogawa 1. Be 7F...゛・1、-、、-7 1st fig. Gemanrho is trash 4 --- Senbushi Kimono Cup No. 31 (in)

Claims (1)

[Claims] 1. A protective transparent thin plate glass is bonded via an adhesive layer onto the color separation filter formed on a transparent glass substrate, and the thickness of this adhesive layer is adjusted to the thickness of the glass substrate. A face plate with a color separation filter for a single-tube image pickup tube, characterized in that the peripheral part of the board is thinner than the center part of the board. 2. A face plate with a color separation filter for a single-tube image pickup tube according to claim 1, wherein the thickness of the adhesive layer at the peripheral portion of the substrate is less than 1/2 of the thickness of the adhesive layer at the central portion. 3. A transparent thin plate glass for protecting the color separation filter is placed on the transparent glass substrate and the color separation filter formed thereon via an adhesive layer, so that the thickness of the adhesive layer is around the periphery of the glass substrate. The color for single-tube image pickup tubes is characterized in that the thin glass is curved and bonded so that it is thinner than the center of the substrate, and then the surface of the thin glass on the side that is not in contact with the adhesive layer is polished to make it flat. Method for manufacturing a face plate with a decomposition filter.