Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Platen With Imbedded Transducers For Print Hammer Testing

IP.com Disclosure Number: IPCOM000048756D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Chen, WT: AUTHOR [+3]

Abstract

The printer platen 10 has a transducer strip 11 of metallized polyvinaldenefluoride (PVF(2)) sandwiched between face plate 12 and platen bar 13. The transducer strip 11 operates on the principle that PVF(2) produces a voltage when subjected to pressure, such as during hammer impacts, which is inversely proportional to the transducer capacitance. In turn the film capacitance is directly proportional to area and inversely proportional to film thickness.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 61% of the total text.

Page 1 of 2

Platen With Imbedded Transducers For Print Hammer Testing

The printer platen 10 has a transducer strip 11 of metallized polyvinaldenefluoride (PVF(2)) sandwiched between face plate 12 and platen bar
13. The transducer strip 11 operates on the principle that PVF(2) produces a voltage when subjected to pressure, such as during hammer impacts, which is inversely proportional to the transducer capacitance. In turn the film capacitance is directly proportional to area and inversely proportional to film thickness.

As seen in Fig. 2, the transducer strip 11 comprises a film strip 14 of PVF(2) having plural metallized segments 15 connected with metallized address lines 16 to an external connector 17 at the left end of the strip. The bottom surface of film 14 has metal segments 18 which coincide with the segments 14 on the top surface thereof. Address lines may be provided on the bottom surface of film 14 or they may be completely absent depending on the specific construction to be used.

In the construction of Fig. 3, face plate 12 is undercut to provide a central pressure ridge 19 which engages the transducer segments 15 on the upper surface of film 14. Segments 18 are in contact with the top surface of platen bar 13 and are thereby grounded. Epoxy beads 20 and 21 isolate plate 12 from platen bar 13.

In Fig. 4, the bottom surface of face plate 12 is not undercut and has a coating 21 of TEFLON* or KAPTON* insulation material. This configuration isolates transducer segment...