Browse Prior Art Database

Thermal Printing Media

IP.com Disclosure Number: IPCOM000047516D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Schierhorst, AE: AUTHOR

Abstract

Adding a dielectric coating to conventional thermal printing paper permits imaging by electrostatic means, rather than conventional thermal heads, and allows for faster printing operations. As shown in the above figure paper 1 contains a thermally sensitive marking layer 2 and a dielectric coating layer 3. As the paper feeds in the direction of arrow 4, it successively passes imaging station 5, developing station 6, and heating station 7. An electrostatic head at imaging station 5 produces a patterned image of electrostatic charges in coating layer 3 which causes a heat-absorbing powder to adhere by electrostatic attraction (at developing station 6) in the pattern of the pre-formed charges. At heating station 7 the paper and adhered powder are irradiated by thermal energy insufficient per se to mark the paper.

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 Media

Adding a dielectric coating to conventional thermal printing paper permits imaging by electrostatic means, rather than conventional thermal heads, and allows for faster printing operations. As shown in the above figure paper 1 contains a thermally sensitive marking layer 2 and a dielectric coating layer 3. As the paper feeds in the direction of arrow 4, it successively passes imaging station 5, developing station 6, and heating station 7. An electrostatic head at imaging station 5 produces a patterned image of electrostatic charges in coating layer 3 which causes a heat-absorbing powder to adhere by electrostatic attraction (at developing station 6) in the pattern of the pre-formed charges. At heating station 7 the paper and adhered powder are irradiated by thermal energy insufficient per se to mark the paper. The heat is retained by the powder and also neutralizes the electrostatic charges on the paper so that the powder falls by gravity into a collecting pan (not shown) when the paper reaches position 8. However, between the heating station 7 and position 8 the powder cumulatively transfers sufficient heat to adjacent areas of the paper to produce the required markings. By means (not shown), powder released at position 8 may be returned to the developing assembly for re-use, and the paper may be cut as required at a exiting station (not shown).

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]