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TRANSDUCER/LABEL

IP.com Disclosure Number: IPCOM000006775D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2002-Jan-31
Document File: 2 page(s) / 96K

Publishing Venue

Motorola

Related People

Christopher McCarley: AUTHOR [+2]

Abstract

The concept is to use a polyvinylidene fluoride (PVDF) material as a transducer/label combination in a consumer device requiring both an audible alert and iden- tifier label. A good example product is a pager. The con- tinuing emphasis on size reduction in electronic devices has resulted in high priced miniature transducers. The transducer/label allows the transducer to move to the exterior, freeing up valuable space inside the unit. The high priced miniature transducer is replaced by a less expensive piece of PVDF material.

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MOlOROLA INC. Technical Developments Volume 18 March 1993

TRANSDUCER/LABEL ~

by Christopher McCarley and Andy Johnson i

INTRODUCTION:

  The concept is to use a polyvinylidene fluoride (PVDF) material as a transducer/label combination in a consumer device requiring both an audible alert and iden- tifier label. A good example product is a pager. The con- tinuing emphasis on size reduction in electronic devices has resulted in high priced miniature transducers. The transducer/label allows the transducer to move to the exterior, freeing up valuable space inside the unit. The high priced miniature transducer is replaced by a less expensive piece of PVDF material.

DESCRIPTION OF PVDF MATERIAL:

  The transducer/label utilizes the technology of a poly- vinylidene fluoride (PVDF) material that exhibits the piezoelectric effect. This piezoelectric material is uniquely suited for creating transducers in a thin, flexible, sheet form. Kynar is a commercially available example of this material.

  PVDF, lie other piezoelectric materials, produces mechanical motion in response to an applied AC voltge, and as a result acoustical energy (Figure 1).

APPLICATIONS:

  The PVDF transducer will be attached to the unit housing (Figure 2), over its electrical contacts, using a semi-permanent adhesive (label adhesive). A conduc- tive adhesive may or may not be necessary depending on the contacting scheme.~ The exact arrangement of the contacts on (or through) #the unit housing depends on the geometry of the electrodes on the PVDF film.

SAUPLE DEYOCE

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ELECTRODE GEOMETF?Y:

  A number of possible geometries/designs arc pos- sible for the PVDF fti (Pigums 3a, 3b, 3~). It is likely that both transducer electrodes will need to be on the same side, i.e. the outsideielectrode must be "routed" to the other side. Some posstble designs are:

* Figure 1

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