Browse Prior Art Database

LASER JET PRINTER CONCEPT

IP.com Disclosure Number: IPCOM000025464D
Original Publication Date: 1985-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 205K

Publishing Venue

Xerox Disclosure Journal

Abstract

A laser jet printer uses a laser to deliver the necessary energy to the ink-containing ribbon in order to deliver ink therefrom to the recording medium, such as paper in the form of microdrops. There are two basic concepts to accomplish laser jet printing. The first is with a single pulsed laser which is deflected by a refractor, and the second is with an array of pulsed lasers which cover the desired print-swath height on a laser per pixel basis. No refractor is necessary, of course, for the array of lasers in the second concept.

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LASER JET PRINTER CONCEPT Proposed David M. Markham Classification

US. CI. 346/75

Int. Cl. Gold 15/18

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Volume 10 Number 4 July/August 1985 207

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LASER JET PRINTER CONCEPT (Cont'd)

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   XEROX DISCLOSURE JOURNAL Volume 10 Number 4 JulylAugust 1985

208

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Page 3 of 4

LASER JET PRINTER CONCEPT (Cont'd)

A laser jet printer uses a laser to deliver the necessary energy to the ink- containing ribbon in order to deliver ink therefrom to the recording medium, such as paper in the form of microdrops. There are two basic concepts to accomplish laser jet printing. The first is with a single pulsed laser which is deflected by a refractor, and the second is with an array of pulsed lasers which cover the desired print-swath height on a laser per pixel basis. No refractor is necessary, of course, for the array of lasers in the second concept.

The first concept is schematicized in Figure 1, wherein the laser jet printer 10 comprises a pulsed laser 12 which produces short bursts of beams 13 that are shaped by the appropriate shaping optics 14. The shaped beams 15 pass through refractor 16, where the refractive index is varied by modulating the beam intensity or by electro-mechanically stressing the refractor. The deflected beam bursts 17 strike the absorptive back surface of the ink containing ribbon 18, discussed more fully later, transferring their bursts of energy to the ribbon where each burst causes a quantity of microdrops 19 of ink to be ejected from the ribbon and propelled to the recording medium 20. The ribbon is described later with respect to Figures 3 and 4. Microdrop sensors 22 are used to calibrate the refractor by sensing the high and low beam deflections via well known sensing circuitry (not shown) in conjunction with the controller 24. The controller provides the digital/analog driver and timing electronics for the laser 12 and the refractor 16. Either the laser, shaping optics, and refractor are mounted on a carriage (not shown) for reciprocating movement back and forth across the recording medium in a direction perpendicular to the direction of periodic stepping by the .recording medium (see. arrow 23), or they are fixed and the recording medium 20 is moved in the direction perpendicularly into the surface of Figure 1, as indicated by arrow 21, until each swath of printing is completed, then stepped the distance "H" of one swath height in the direction of arrow 23.

In the second concept of a laser jet printer 30 shown in Figure 2, an array of pulsed lasers 32 is employed one for each pixel location in a column of pixel locations "H" high on recording medium 20. Instead of deflecting the beam bursts 35, each laser in the array addresses a p...