Browse Prior Art Database

REMOTE ACCESSORY PACK

IP.com Disclosure Number: IPCOM000009740D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2002-Sep-16
Document File: 4 page(s) / 170K

Publishing Venue

Motorola

Related People

Mark Constable: AUTHOR

Abstract

This paper describes a system/device that can be employed to increase the functionality of a primary electronic device with a negligible increase in weight, volume and dimensions of the primary device as well as a lower design cost. The system uses either a cord or a radio frequency link to com- municate with a remote accessory device rather than adding internal circuitry or a large snap-on sec- ondary module. This allows increased functionality without the need to significantly increase the size of the primary device and the design challenges of including it with the primary device.

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0 M M-LA Technical Developments

REMOTE ACCESSORY PACK

by Mark Constable

ABSTRACT

  This paper describes a system/device that can be employed to increase the functionality of a primary electronic device with a negligible increase in weight, volume and dimensions of the primary device as well as a lower design cost. The system uses either a cord or a radio frequency link to com- municate with a remote accessory device rather than adding internal circuitry or a large snap-on sec- ondary module. This allows increased functionality without the need to significantly increase the size of the primary device and the design challenges of including it with the primary device.

PROBLEM IDENTIFICATION

  l Portable electronics are growing increasingly complex and at the same time device size and weight requirements are shrinking. The market is continually demanding reduced size and increased performance. These opposing requirements typical- ly result in reduced functionality to meet product size requirements.

  Increasing functionality on an existing portable wireless electronic device is typically accomplished one of 3 ways: 1) Redesign the entire unit to include the added functionality. 2) Add new printed wiring board assemblies to the existing package and modi- fy the housing and internal cabling as needed. 3) Design a new module that attaches to the primary device exterior as shown in Figure 1. All three con- cepts have significant design problems associated with them. Developing either the module or addi- tional circuitry is complicated and expensive. A sig- nificant amount of the cost is integrating the mechanical packages together. This applies to a separate module that attaches to a primary device or integration of additional circuitry into the device. In addition to the cost of the mechanical integration, the additional circuitry will also cause crosstalk

problems, added weight, added bulk, reduced drop shock resistance, increased thermal problems, added load on the battery and inconvenience to the cus- tomer due to a larger weight and volume.

  A solution to this problem is to design the added functionality into a remote module. Communication to the remote module is accomplished with either a low power radio frequency link or a cord. The remote module solves several problems:

  l It's remote location results in elimination or a significant reduction in crosstalk problems.

  l The separate module allows a separate battery, reducing the load on the primary battery.

   If an RF link is employed, the module doesn't have to be carried with the primary device. It has only to be located within the range of the RF trans- ceiver such as in a pocket, on a belt, in a purse, or in a briefcase.

  l The cost of mechanical integration of the attached module or the additional circuitry to the primary device is significantly reduced. A separate module which houses the bulk of the circuitry is sig- nificantly less expensive because primary device geometry matching, cosm...