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

Thermal Printing With Ceramic Tipped Printhead

IP.com Disclosure Number: IPCOM000039962D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Findlay, HT: AUTHOR [+4]

Abstract

A ribbon consisting of a thermal ink on a 1000-angstrom aluminum layer is driven by electrodes having a semiconductive ceramic tip which contacts the aluminum layer. The printhead is resistant to wear, and the ribbon is thin and economical. Fig. 1 illustrates standard resistive ribbon printing in which an electrode contacts a conductive polycarbonate layer, while a 1000-angstrom aluminum layer is positioned between the ink layer and the polycarbonate layer. Current passes in a relatively low resistance path from the electrode into the polycarbonate, where it creates heat primarily in the more resistive portions of the ribbon. Such printing is shown in more detail, for example, in U.S. Patent 4,345,845. Fig. 2 illustrates printing with the ceramic tipped printhead. The polycarbonate layer is eliminated.

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 100% of the total text.

Page 1 of 2

Thermal Printing With Ceramic Tipped Printhead

A ribbon consisting of a thermal ink on a 1000-angstrom aluminum layer is driven by electrodes having a semiconductive ceramic tip which contacts the aluminum layer. The printhead is resistant to wear, and the ribbon is thin and economical. Fig. 1 illustrates standard resistive ribbon printing in which an electrode contacts a conductive polycarbonate layer, while a 1000-angstrom aluminum layer is positioned between the ink layer and the polycarbonate layer. Current passes in a relatively low resistance path from the electrode into the polycarbonate, where it creates heat primarily in the more resistive portions of the ribbon. Such printing is shown in more detail, for example, in U.S. Patent 4,345,845. Fig. 2 illustrates printing with the ceramic tipped printhead. The polycarbonate layer is eliminated. The ribbon may have an ink layer the same thickness as that of Fig. 1, and the ribbon is therefore thinner. A thinner ribbon is generally less expensive and yields printing of high detail. The ceramic is semiconductive and therefore resistive. Current from the electrode produces heat for printing both in the ceramic and in the aluminum oxide layer which occurs inherently on the outside of the aluminum. The ceramic is a hard structure which is resistant to wear, whereas the standard printhead without the hard tip is sensitive to wear.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]