# US 5,345,673 A · Method of manufacturing a printed wiring board

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- Number: US 5,345,673 A
- Document ID: US5345673A
- Status: Granted
- Kind: A
- Application number: 08/163,569
- Filed: 1993-12-08
- Granted: 1994-09-13
- Earliest claimed: 1989-07-12
- Inventors: Yoshitaka Saitoh
- Web page: https://patentgrep.com/patent/US5345673A

## CPC

- H05K 9/0039: {Galvanic coupling of ground layer on printed circuit board [PCB] to conductive casing (printed shielding conductors, ground planes or power planes for reduction of cross-talk or noise in printed circuits H05K1/0218)}
- H05K 1/0218: {by printed shielding conductors, ground planes or power plane (H05K1/0236 takes precedence)}
- H05K 2201/0715: provided by an outer layer of PCB
- Y10T 29/49155: Manufacturing circuit on or in base
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of manufacturing a printed wiring board is disclosed. The method comprises the steps of forming a printed circuit on a substrate, coating an insulating layer on at least a part of the printed circuit, coating a shield layer on at least a part of the insulating layer, and forming the shield layer by a halftone dot.

## Claims

### Claim 1

A method of manufacturing a printed wiring board which comprises the steps of forming a printed circuit on a substrate, coating an insulating layer on at least a part of the printed circuit, and coating a shield layer on at least a part of the insulating layer by applying a pattern of halftone dots.

### Claim 2 (depends on 1)

A method of manufacturing a printed wiring board as claimed in claim 1, wherein the pattern of halftone dots is in a shape of a netting formed in a continuous fine strip.

### Claim 3 (depends on 1)

A method of manufacturing a printed wiring board as claimed in claim 1, wherein the halftone dot pattern comprises a number of discontinuous dots.

### Claim 4

A method of producing a printed circuit board, comprising:
forming a circuit on a substrate;
covering at least a portion of the circuit with an insulating layer; and
applying a shield layer of halftone dots on at least a portion of the insulating layer.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the halftone dots have a continuous net-like pattern.

### Claim 6 (depends on 4)

The method according to claim 4, wherein the half-tone dots are discontinuous.