Mobile telephone set

Abstract

In a portable telephone having a rechargeable battery, an electrically conductive outer cover of the rechargeable battery is connected at a plurality of locations to a ground layer of a circuit board provided within the portable telephone.

Description

technical field [0001] The present invention relates to portable telephones, and more particularly to portable telephones having a rechargeable battery as a power source. Background technique [0002] A conventional portable phone or cellular phone having a rechargeable battery as a power source will be described with reference to FIGS. 1A, 1B, 2 and 3. Referring to FIG. Fig. 1A is a front view of a conventional portable telephone and Fig. 1B is a rear view thereof. A rechargeable battery 2 having a charging terminal 3 is attached to the back of the mobile phone 1 . [0003] Fig. 2 is a cross-sectional view of the mobile phone shown in Figs. 1A and 1B. A rechargeable battery 2 is provided in the housing of the body of the portable telephone 1 and supplies power through a pair of power supply pins 6 to a circuit board 4 (such as a multilayer printed circuit board) including a radio circuit disposed therein. , receiving circuit, transmitting circuit and control circuit and ...

AI Technical Summary

Problems solved by technology

In the area defined between the circuit board 4 and the rechargeable battery 2, a large amount of high-frequency current flowing through the circuit board 4 is shunted to an LSI (Large Scale Integration) provided on the circuit board 4, resulting in failure of the LSI

For example, there may be a case where the voice quality in a conversation over the telephone is degraded due to impulse noise in the voice signal, which is generated from a high-frequency current spurious from a circuit board in an LSI constituting a receiving circuit

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