Browse Prior Art Database

AN INTEGRATED MIRCROPHONE AND LOUDSPEAKER

IP.com Disclosure Number: IPCOM000008920D
Original Publication Date: 1999-Jan-01
Included in the Prior Art Database: 2002-Jul-24
Document File: 2 page(s) / 95K

Publishing Venue

Motorola

Related People

Paul Collis: AUTHOR

Abstract

A microphone is integrated into the structure of a loudspeaker. Spring contacts provide the micro- phone connections, thereby eliminating wires, flex- es, connectors, or soldered contacts. This arrange- ment can be used in a portable radio.

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MOTOROLA Technical Developments

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AN INTEGRATED MIRCROPHONE AND LOUDSPEAKER

by Paul Collis

ABSTRACT

  A microphone is integrated into the structure of a loudspeaker. Spring contacts provide the micro- phone connections, thereby eliminating wires, flex- es, connectors, or soldered contacts. This arrange- ment can be used in a portable radio.

INTRODUCTION

Improved mounting arrangements for micro- phones are proposed.

PROBLEM TO BE SOLVED

  Portable radios need a loudspeaker and a micro- phone. The assembly process for the loudspeaker can be simplified by using spring contacts on the back of tlte speaker which make contact with pads on the PCB. This eliminates the need for wires or a flex and the associated soldered contacts. See Figure 1 on next page.

  Microphone capsules, however, need to be sol- dered either to a flex or directly on a PCB. This is an additional processing step during manufacture. It also results in some degradation in quality because of the heat from reflow. Alternatively, a special type of microphone suitable for mounting in a socket can

be used. This is however more costly, and it increases the part count by one.

PROPOSED SOLUTION TO THE PROBLEM

  The basic idea is to integrate the microphone into the loudspeaker structure and use the same spring contact concept for the microphone connec- tions, thereby eliminating any requirement for wires, flexes, connectors, soldered contacts etc.

  The first proposal is shown in Figure 2. The microphone capsule is m...