# US 8,543,175 B2 · Mobile terminal device

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- Number: US 8,543,175 B2
- Document ID: US8543175B2
- Status: Granted
- Kind: B2
- Application number: 11/991,154
- Filed: 2005-09-16
- Published: 2009-10-22
- Granted: 2013-09-24
- Earliest claimed: 2005-09-16
- Assignees: Fujitsu Limited
- Applicants: Hidekatsu Kobayashi; Wataru Murata; Hiroaki Matsuda; Yoshifumi Kajiwara; Masamichi Watanabe; Tatsuhito Araki; Yoshiaki Kato
- Inventors: Hidekatsu Kobayashi; Wataru Murata; Hiroaki Matsuda; Yoshifumi Kajiwara; Masamichi Watanabe; Tatsuhito Araki; Yoshiaki Kato
- Web page: https://patentgrep.com/patent/US8543175B2

## CPC

- H04B 15/00: Suppression or limitation of noise or interference (by means associated with receiver H04B1/10)
- H05K 1/0218: {by printed shielding conductors, ground planes or power plane (H05K1/0236 takes precedence)}
- H04M 1/0216: {Foldable in one direction, i.e. using a one degree of freedom hinge}
- H05K 1/0254: {High voltage adaptations; Electrical insulation details; Overvoltage or electrostatic discharge protection (electrostatic discharge protection for electric apparatus in general H05K9/0067, H05K9/0079); Arrangements for regulating voltages or for using plural voltages}
- H05K 1/0393: {Flexible materials (H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups)}
- H05K 1/147: {at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit (H05K1/148 takes precedence)}
- H05K 1/148: {Arrangements of two or more hingeably connected rigid printed circuit boards, i.e. connected by flexible means}
- H05K 2201/041: Stacked PCBs, i.e. having neither an empty space nor mounted components in between
- H05K 2201/051: Rolled
- H04B: TRANSMISSION
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)

## Abstract

To provide a mobile terminal device that can eliminate influence of static electricity upon signal lines of a signal-line flexible board that is placed through a connecting unit that connects two casings to be able to overlie one another. In the mobile terminal device, one of the casings and the other casing are connected through a connecting unit to be able to overlie one another, and a signal-line flexible board that connects circuit boards housed in one of the casings and the other casing, respectively, is placed through the connecting unit. The mobile terminal device includes a pair of frame-grounded flexible boards that are formed wider than the signal-line flexible board to have a conductor pattern frame grounded, and sandwich both outer surfaces of the signal-line flexible board therebetween.

## Claims

### Claim 1

A mobile terminal device comprising:
two casings, each containing a circuit board, connected through a connecting unit to be able to overlie one another;
a signal-line flexible board that is provided through the connecting unit to connect the circuit boards of the casings; and
a pair of frame-grounded flexible boards that are formed wider than the signal-line flexible board to have a conductor pattern frame grounded, and sandwich both outer surfaces of the signal-line flexible board therebetween,
wherein the frame-grounded flexible boards have a reinforcement of a nonconductor material on both sides of an outer surface not facing to the signal-line flexible board, and edge faces of the reinforcement wider than the signal-line flexible board are intermittently peeled in the longitudinal direction of the frame-grounded flexible boards to expose the conductor pattern.

### Claim 2 (depends on 1)

The mobile terminal device according to claim 1, wherein
the connecting unit has a foldable hinge structure, and armored cases of the casings are metallic cases, and
a part of the armored cases in the hinge structure at which the signal-line flexible board is placed, is made of a resin material.

### Claim 3 (depends on 1)

The mobile terminal device according to claim 1, wherein
one of the casings includes a grounded antenna plate near the connecting unit, and
the antenna plate includes an extended plate member that is extended into the connecting unit to turn around outside of the signal-line flexible board from a part of the antenna plate.

### Claim 4 (depends on 3)

The mobile terminal device according to claim 3, wherein the extended plate member is formed wider than the signal-line flexible board.

### Claim 5 (depends on 1)

The mobile terminal device according to claim 1, wherein the signal-line flexible board includes plural boards.

### Claim 6 (depends on 1)

The mobile terminal device according to claim 1, wherein the connecting unit has a foldable hinge structure, and the signal-line flexible board is curled to make one turn in the hinge structure.