# US 6,720,120 B2 · Substrate having fine lines, method for manufacturing the same, electron-source substrate, and image display apparatus

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- Number: US 6,720,120 B2
- Document ID: US6720120B2
- Status: Granted
- Kind: B2
- Application number: 10/003,236
- Filed: 2001-12-06
- Published: 2002-06-20
- Granted: 2004-04-13
- Earliest claimed: 2000-12-15
- Assignees: Canon Kabushiki Kaisha
- Inventors: Yoshimi Uda; Kazuya Ishiwata; Shinsaku Kubo; Yasuyuki Watanabe
- Web page: https://patentgrep.com/patent/US6720120B2

## CPC

- H01J 31/123: {Flat display tubes}
- H01J 9/02: Manufacture of electrodes or electrode systems
- H01J 2217/49207: Electrodes
- H05K 1/092: {Dispersed materials, e.g. conductive pastes or inks}
- H05K 3/02: in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A substrate includes fine lines. The fine lines are obtained according to a fine-line forming process, which includes a process of projecting light from above the substrate onto predetermined regions on a photosensitive material provided on the substrate and a developing process after the light projection process. A narrow-width portion is provided at an end portion of each of the fine lines in a longitudinal direction of the fine line. The width of the narrow-width portion is smaller than the width of a portion adjacent to the narrow-width portion.

## Claims

### Claim 1

A substrate comprising:
fine line formed on the substrate,
wherein the fine line has a narrow-width portion at an end portion of said fine line in a longitudinal direction of said fine line, and
a width of the narrow-width portion is smaller than a width of a portion adjacent to the narrow-width portion;
in a section of said fine line cut in the direction of a normal line on the face forming said fine line on said substrate, the section comprises a part which is away from the substrate-side-end of said section, a length of a part of the section in the parallel direction to said substrate face is longer than a length of the substrate-side-end of said section in the parallel direction to said substrate face; and
the fine line has a thickness of at least 5 μm.

### Claim 2 (depends on 1)

A substrate according claim 1, wherein the fine line is conductive.

### Claim 3 (depends on 2)

A substrate according claim 2, wherein the fine line is wire.

### Claim 4 (depends on 1)

A substrate according to claim 1, wherein the end portion has a cut provided from distal end of the end portion such that the end portion is divided into at least two portions.

### Claim 5 (depends on 1)

A substrate according to claim 1, wherein the end portion is chamfered from a distal end of the end portion.

### Claim 6 (depends on 1)

A substrate according to claim 1, wherein a length of the narrow-width portion in the longitudinal direction is at least half a width of a portion adjacent to the narrow-width portion.

### Claim 7 (depends on 1)

A substrate according to claim 1, wherein the end portion includes a portion where the width gradually decreases toward a distal end of the end portion.

### Claim 8 (depends on 1)

An electron-source substrate comprising:
a substrate according to claim 1; and
electron emitting device provided on said substrate,
wherein said fine line is wire for supplying said electron emitting device with a signal for driving s id electron emitting device.

### Claim 9 (depends on 8)

An electron-source substrate according to claim 8, wherein a plurality of said electron emitting devices are provided, wherein said plurality of electron emitting devices are arranged in the shape of a matrix, and wherein a plurality of said wires perform matrix connection of said plurality of electron emitting devices arranged in the shape of the matrix.

### Claim 10 (depends on 8, 9)

An image display apparatus comprising:
an electron-source substrate according to claim 8 or 9; and
phosphor for emitting light by electrons emitted from said electron emitting device.

### Claim 11 (depends on 1)

An image display apparatus comprising:
a substrate according to claim 1; and
image display devices,
wherein said -fine lines are wires for supplying said image display devices with a signal for driving said image display devices.