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Electrical Connector Assembly in Rotating Mobile Hand Phone

IP.com Disclosure Number: IPCOM000030874D
Original Publication Date: 2004-Aug-31
Included in the Prior Art Database: 2004-Aug-31
Document File: 4 page(s) / 251K

Publishing Venue

Motorola

Related People

Budi Juswardy: AUTHOR

Abstract

This report presents an electrical connector assembly for a closeable portable telephone phone having a two part rotatable housing and variations of such structures. Electrical connection between the two housing parts is achieved by employing ball-bearing as means to conduct electrical signals. Some issues regarding electrical connector assemblies currently used two part rotatable housings, and how this proposed structure addresses those issues, are also discussed.

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Title:

Electrical Connector Assembly in Rotating Mobile Hand Phone

Author:

Budi Juswardy

Abstract:

This report presents an electrical connector assembly for a closeable  portable telephone phone having  a two part rotatable housing and variations of such structures. Electrical connection between the two housing parts is achieved by employing ball-bearing as means to conduct electrical signals. Some issues regarding electrical connector assemblies currently used two part rotatable housings, and how this proposed structure addresses those issues, are also discussed.

            The proposed structure can be used in some applications where there is a need to provide many electrical connections to two part housings capable of turning for 360o or more (both in clockwise and counter clockwise directions). Such connections could be used in phones, cameras/ security surveillance systems, any devices that need electrical connection for the rotatable housings and in robotic applications.

Description

In most mobile phones having two part rotatable housings the connectors currently employed, to connect the circuitry on the Printed Circuit Board (PCB) inside body of the phone (one of the housings) with circuitry inside a blade/ rotating part (the other one of the housings), are mostly wires with board-to-board (B2B) pin connectors. These connectors have some limitations. Firstly, in most cases, rotation is limited in one direction and up to a maximum angle of 270 degrees and only into one direction, either clockwise or counter clockwise. Secondly, the number of electrical connections is limited by the number of board-to-board (B2B) connector pins. Moreover, reliability of the B2B pin connector is poor during drop testing.   Furthermore, the ground path of the circuitry on the blade is limited by the availability of the B2B pins. This results in poor performance for Electrostatic Discharge (ESD) immunity. Also, because of rotational motion, the wires need to be bent and coiled resulting in electrical lines having long paths, which is not desired for ESD immunity, Electro Magnetic Compatibility (EMC), and high speed digital signal data integrity.

            Figure 1 and Figure 2 show the electrical connector assembly having connectors  using ball bearings. The electrical connector assembly has a main Printed Circuit Board (PCB) and electrical connection is implemented by means of Surface Mount Technology (SMT) pins/ Ball Grid Arrays (BGA) or any other standard board-to-pin interface. Next ...