Browse Prior Art Database

SHOCK ISOLATOR INSTALLATION INDICATOR

IP.com Disclosure Number: IPCOM000006422D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2002-Jan-02
Document File: 2 page(s) / 84K

Publishing Venue

Motorola

Related People

David A. Tribbey: AUTHOR [+3]

Abstract

This paper describes a method, other than weighing or visual inspection, for the detection of missing shock isolators, (snubbers), in products. Shock isolators 'are used to increase mechanical and electrical reliability of the product. Historically, the most frequent fioished prod- uct defect is the missing shock isolator.

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MOTOROLA INC. Technical Developments Volume 15 May 1992

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SHOCK ISOLATOR INSTALLATION INDICATOR

by David A. Tribbey, Allen D. Hertz L? Harold Holden

  This paper describes a method, other than weighing or visual inspection, for the detection of missing shock isolators, (snubbers), in products. Shock isolators 'are used to increase mechanical and electrical reliability of the product. Historically, the most frequent fioished prod- uct defect is the missing shock isolator.

A means is provided for detecting the absence of shock isolators after the product is ftished and "closed up" by

adding a circuit that includes a probe from the antenna plate to a pad on the substrate that will cause a functional electrical failure (preferred embodiment would be to dis- able the operation of the unit) to prevent radio power up if closed unit is closed without snubber. One embodiment of this principle is shown in Figure A. This is designed pri- marily for a low profde (credit card) product. As shown, the shock isolator, when located in position, prevents the closing of the power up circuit as shown in Figure B.

Metal Cover

Populated Board

\ indicator Pad Set

Figure A

To Microprocessor

4 I m Clock crystal

I

Figure B

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MOTOROLA INC. Technical Developments Volume 15 May 1992

  Another embodiment ofthe shock isolator detector on one board in alignment &ith a reception pad located is shown in Figure C. This is pa...