# US 2013/0153283 A1 · Flexible Flat Cable

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- Number: US 2013/0153283 A1
- Document ID: US20130153283A1
- Status: Published application
- Kind: A1
- Application number: 13/628,317
- Filed: 2012-09-27
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: Hosiden Corporation
- Inventors: Hayato Kondo
- Web page: https://patentgrep.com/patent/US20130153283A1

## CPC

- H01B 7/04: Flexible cables, conductors, or cords, e.g. trailing cables
- H05K 1/0253: {Impedance adaptations of transmission lines by special lay-out of power planes, e.g. providing openings (H05K1/0251 takes precedence)}
- H05K 1/0225: {Single or multiple openings in a shielding, ground or power plane (H05K1/0227 takes precedence)}
- H05K 1/118: {specially for flexible printed circuits, e.g. using folded portions}
- H05K 2201/0715: provided by an outer layer of PCB
- H05K 2201/09681: Mesh conductors, e.g. as a ground plane
- H05K 2201/0969: Apertured conductors
- H05K 2201/2009: Reinforced areas, e.g. for a specific part of a flexible printed circuit
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A plurality of linear conductors arranged in parallel with each other are covered from the upper and lower sides thereof by first and second insulator layers. On the upper side of the first insulator layer, a first adjustment material layer is formed with forming a predetermined gap relative to an end of the flat cable. And, at this gap, a reinforcement plate is provided. A shield member is provided for covering the upper side of the reinforcement plate and a portion of the upper side of the first adjustment material layer. From the upper side of the shield member to the upper side of the first adjustment material layer, a first shield layer is provided in such a manner to expose the upper side of the portion of the shield member where the reinforcement plate is present. A second insulator layer is configured to expose the conductors at the end of the flat cable. The shield member includes an impedance adjusting arrangement.

## Claims

### Claim 1

A flexible flat cable comprising:
a first sheet-like insulator layer;
a second sheet-like insulator layer disposed in opposition to the first insulator layer;
a plurality of linear conductors disposed in parallel with each other between the first insulator layer and the second insulator layer;
a first adjustment material layer disposed on the side of the first insulator layer opposite the conductors and spaced from an end of the flexible flat cable with a predetermined distance;
a reinforcement plate provided on the side of the first insulator layer opposite the conductors and between the end of the flexible flat cable and the first adjustment material layer;
a shield member disposed so as to cover the side of the reinforcement plate opposite the first insulator layer and the side of the first adjustment material layer opposite the first insulator layer;
a first shield layer disposed from the side of the shield member opposite the reinforcement plate to the side of the first adjustment material layer opposite the first insulator layer, with exposing a portion of the side of the shield member opposite the reinforcement plate;
wherein the second insulator layer is arranged to expose the conductors at the end of the flexible flat cable;
the exposed conductors and the exposed shield member come into contact with signal terminals and a ground terminal of a connector; and
the shield member includes an impedance adjusting means.

### Claim 2 (depends on 1)

The flexible flat cable according to claim 1, wherein the impedance adjusting means is configured to decrease the surface area of the side of the shield member opposite the reinforcement plate.

### Claim 3 (depends on 2)

The flexible flat cable according to claim 2, wherein:
a gap is formed between the reinforcement plate and the first adjustment material layer;
the shield member comes into contact with the first insulator layer at the gap; and
the rate of decrease in the area at the gap is set greater than the rate of decrease in the area at the portion of the shield member covering the reinforcement member.

### Claim 4 (depends on 2)

The flexible flat cable according to claim 2, wherein the decrease of the area of the shield member is realized by formation of a through hole extending through the shield member.

### Claim 5 (depends on 4)

The flexible flat cable according to claim 4, wherein the through hole is formed at the position overlapped with the conductors as seen in the plane view.

### Claim 6 (depends on 1)

The flexible flat cable according to claim 1, further comprising:
a second adjustment material layer provided on the side of the second insulator layer opposite the conductors and spaced from the end of the flexible flat cable with a predetermined distance; and
a second shield layer provided on the side of the second adjustment material layer opposite the second insulator layer and spaced from the end of the flexible flat cable with a predetermined distance.