# US 4,397,928 A · Process of producing color solid image pickup element base plates

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- Number: US 4,397,928 A
- Document ID: US4397928A
- Status: Granted
- Kind: A
- Application number: 06/399,080
- Filed: 1982-07-16
- Granted: 1983-08-09
- Earliest claimed: 1981-07-16
- Assignees: Fuji Photo Film Co., Ltd.
- Inventors: Masamichi Sato; Eiichi Hasegawa; Koji Shimanuki
- Web page: https://patentgrep.com/patent/US4397928A

## CPC

- H10F 77/331: {for filtering or shielding light, e.g. multicolour filters for photodetectors}
- G03C 7/12: by photo-exposure {(photomechanical production of optical colour artifacts such as colour screens, for purposes other than for additive colour photography G03F7/0007)}
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G)

## Abstract

A multicolor solid image pickup element base plate having bonding pat portions is produced by an on-wafer method utilizing a silver halide photographic emulsion. A solvent permeation preventing layer is formed on a solid image pickup element base plate having an array of a number of image elements. A silver halide emulsion layer is formed on that layer. A micro color filter composed of two or more color separation filter elements is then formed on the emulsion layer. The filter is formed by repeatedly applying a pattern exposure and color development onto the emulsion layer. A protective layer is formed over the entire surface of the base plate. The protective layer, silver halide emulsion layer, and solvent permeation preventing layer are then successively removed. Blackened silver portions may be formed in the emulsion layer at portions corresponding to bonding pat portions prior to the formation of the protective layer by applying thereto a pattern exposure followed by black and white development.

## Claims

### Claim 1

A process of producing a color solid image pickup element base plate comprising the steps of;
coating a solvent permeation preventing layer formed on the surface of a solid image pickup element base plate with a silver halide emulsion layer,
forming a micro color filter composed of at least two-color color separation filter elements by repeatedly applying an image exposure and a color development to the silver halide emulsion layer for each color,
forming a protective layer on the whole surface of the solid image pickup element base plate having the micro color filter thus formed thereon, and
removing the protective layer, the silver halide emulsion layer, and the solvent permeation preventing layer in this order at least the portions corresponding to bonding pat portions of the solid image pickup element base plate having the protective layer thus formed to reveal the bonding pat portions.

### Claim 2 (depends on 1)

The process of producing a color solid image pickup element base plate as claimed in claim 1 wherein a blackened silver pattern is formed in the silver halide emulsion layer at the portions corresponding to the bonding pat portions by applying a light exposure and a black and white development to the portions after the formation of the micro color filter and before the formation of the protective layer.

### Claim 3 (depends on 1)

The process of producing a color solid image pickup element base plate as claimed in claim 1, wherein the silver halide emulsion layer has a thickness from about 0.8 .mu.m to about 10 .mu.m.

### Claim 4 (depends on 1)

The process of producing a color solid image pickup element base plate as claimed in claim 1, wherein a subbing layer is positioned between the silver halide emulsion layer and the solvent permeation preventing layer.