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Browse Prior Art Database

Printhead to Driver Card Connection Scheme

IP.com Disclosure Number: IPCOM000042886D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Barina, RM: AUTHOR [+3]

Abstract

The printhead in a thermal printer consists of 800 resistor elements spaced along a glass rod so that one dot exists for every possible dot along a line of dots on a thermal paper medium. The circuit pads on both the printhead and the glass epoxy cards must meet correctly and contact properly to insure that each of the 800 resistor elements will activate. The apparatus shown in the figure constitutes the connection and includes the 800-resistor-element printhead 10, upper and lower glass epoxy driver cards 12 and 14, upper and lower silicone rubber strips 16 and 18, upper and lower clamp bars 20 and 22, upper and lower wave washers 24 and 26, all held together by screw 28 and nut 30. It is necessary to install the apparatus shown in the figure in the proper sequence and to torque the fasteners to 100 oz.

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Printhead to Driver Card Connection Scheme

The printhead in a thermal printer consists of 800 resistor elements spaced along a glass rod so that one dot exists for every possible dot along a line of dots on a thermal paper medium. The circuit pads on both the printhead and the glass epoxy cards must meet correctly and contact properly to insure that each of the 800 resistor elements will activate. The apparatus shown in the figure constitutes the connection and includes the 800-resistor-element printhead 10, upper and lower glass epoxy driver cards 12 and 14, upper and lower silicone rubber strips 16 and 18, upper and lower clamp bars 20 and 22, upper and lower wave washers 24 and 26, all held together by screw 28 and nut 30. It is necessary to install the apparatus shown in the figure in the proper sequence and to torque the fasteners to 100 oz. inches to give an even pressure load over the entire contact connection area. The driver card circuits mate with the printhead driver circuits. The silicone rubber strips 16 and 18 allow the proper contact pressure with moderate compression set and the clamp bars 20 and 22 reinforce the assembly and distribute the torque pressure over the entire connection surface. The wave washers 24 and 26 take up the silicone compression set.

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