Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3655379 A
Publication typeGrant
Publication dateApr 11, 1972
Filing dateOct 29, 1969
Priority dateOct 29, 1969
Also published asCA929351A1, DE2053002A1, DE2053002B2, DE2053002C3
Publication numberUS 3655379 A, US 3655379A, US-A-3655379, US3655379 A, US3655379A
InventorsGundlach Robert W
Original AssigneeXerox Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Printing by vapor propulsion
US 3655379 A
Abstract
A liquid ink layer is formed on the surface of a transparent substrate. The ink layer is exposed through the substrate to high energy radiation causing exposed ink areas to move to a receiver sheet. It is believed that the ink is transferred by the rapid expansion of vapor.
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent Gundlac'h [15] 3,655,379 [451 Apr. 11, 1972 [54] PRINTING BY VAPOR PROPULSION [72] Inventor: Robert W. Gundlach, Victor, NY. A

[73] Assignee: Xerox Corporation, Rochester, N.Y.

[22] Filed: Oct. 29, 1969 [21 1. Appl. No.: 872,135

3,207,602 9/1965 Shely 3,280,735 10/1966 Clark et a1. 3,360,367 12/1967 Stricklin ..96/27 X 3,408,216 10/1968 Mott et a1. ..117/37 X 3,446,617 5/1969 Stricklin ..96/ 27 3,455,687 7/1969 Holstead et a1. ....250/65.1 X

3,490,371 l/1970 Games ..250/65.1 X

OTHER PUBLICATIONS Rositon et al., IBM Technical Disc. Bull, Vol. 7, N0. 3, Aug. 1964, page 224.

Primary Examiner-John T. Goolkasian Assistant Examiner.loseph C. Gil

Attorney-James .1. Ralabate, Richard A. Tomlin and David C.

Petre [5 7] ABSTRACT A liquid ink layer is formed on the surface of a transparent substrate. The ink layer is exposed through the substrate to high energy radiation causing exposed ink areas to move to a receiver sheet. 1t isbelieved that the ink is' transferred by the rapid expansion of vapor.

8 Claims, 2 Drawing Figures PATENTEDAPR H I972 INVENTOR ROBERT w. GUNDLACH fiww ATTORNEY PRINTING BY VAPOR PROPULSION BACKGROUND OF THE INVENTION This invention relates in general to image formation and more specifically to the formation of images by the transfer of liquid from a donor member to a receiver member in response.

to imagewise high energy electromagnetic radiation.

Many methods are known for producing visible images including printing and photographic methods where the color of a light sensitive chemical is changed by the action of light. Other methods of forming a visible image are known where light is used to alter the hardness, tackiness, solvent resistance, or ink receptivity of a suitable material. Other methods include electrostatic methods where an electrostatic charge pattern is formed on the surface of a material and is developed by electroscopic material. Further methods are known where high energy light is used to cause the evaporation of a material in image configuration from a donor sheet with subsequent condensation in image configuration on a receiver sheet. An additional process is shown in U.S. Pat. No. 2,503,759 to A. Murray in which a material is evaporated from a substrate in image configuration leaving behind a positive image. The above processes all require complex image forming and developing steps or the evaporation of a material to form a final print.

Another method of forming an image is disclosed in copending application Ser. No. 783,059 filed Dec. 11, 1968 by W. E. L. Haas et al. in which a layer of radiation absorbing particles is placed on a donor sheet and exposed to an imagewise pattern of high intensity short duration radiation which propells the particles from the donor sheet in an imagewise pattern to a receiving sheet. The donor layers used in this process are, however, difficult to reconstitute and are disposed.

SUMMARY OF THE INVENTION It is an object of this invention to provide an imaging system which overcomes the above mentioned disadvantages.

It is another object of this invention to provide a relatively simple imaging system.

It is another object of this invention to provide an imaging system which requires no chemical developing step.

It is another object of this invention to provide an imaging system which does not require complex chemicals or charge patterns.

It is another object of this invention to provide a method for printing images without the necessity for preparing printing plates.

The above objects and others are accomplished in accordance with this invention by providing a'layer of liquid ink on the surface of a transparent member. A receiver sheet is placed close to the liquid layer. The liquid layer is then exposed to high energy electromagnetic radiation in image configuration. It has been found that when these steps are completed the liquid in light struck areas jumps across a gap to the receiver sheet in image configuration. The image on the receiver sheet may then be fixed by allowing the ink to dry or the receiver sheet may be somewhat porous allowing the liquid to permeate therein. By exposing the liquid layer to radiation projected through a negative transparency a positive image may be formed on the receiver sheet. In a preferred embodiment the substrate on which the liquid layer is formed is in the form of a gravure or grooved plate. The grooves or cups are filled with the liquid and the raised areas which contact the receiver are substantially free of ink. The receiver sheet may then be placed in contact with the raised areas of the gravure or grooved plate. Sharper images are obtained when the liquid layer is in the ,form of a series of minute, discrete pools rather than in the form of a uniform liquid layer. A further advantage exists in that since the receiver sheet is in contact with the raised areas of the plate it is almost in contact with the liquid thereby requiring less light energy to move the liquid to the receiver sheet than would be required if the receiver sheet were placed at some distance from the liquid layer and also provides sharper images.

Although the exact mechanism which causes the layer to be transferred to the receiver sheet is not known, apparently small pockets of vapor are formed in image areas by the conversion of radiant energy to heat energy upon absorption near the interface between the transparent member and the liquid layer. The rapid expansion of these vapor pockets propels the liquid away from the transparent member. It has been found that images may be formed across as much as a V; inch gap. Since evaporation of more than a very small'fraction of the liquid layer is not required to cause transfer, the energy requirements are much less than for those systems which require the evaporation and condensation of an entire layer.

It is desirable to use a relatively short period of illumination to cause transfer. The energy provided by an extended low level of illumination would tend to be dissipated by conduction to the substrate or surrounding ink layer. A preferred illumination would have an energy of less than about 1.0 joules/cm. for a time not greater than about 10 sec., depending on the thickness of the'layer, the nature of the layer, the gap to be traversed and whether blowing agents are incorporated in the layer. For example, where the illumination time is reduced to about 4 X 10 seconds an energy level of about 0.3 joules/cm. is sufficient.

Images may be formed in any color depending only on the color of the liquid ink used. Further, full color images may be prepared by using color separation transparencies and superimpo sing a succession of colored images on a single receiver sheet.

Fixing of the image produced may be aided by utilizing a liquid ink in which a paraffin or wax-like material has been dissolved. On evaporation of the liquid component the waxlike material will form a binder for the final image. Or the liquid layer may be a material which is a liquid at elevated temperatures and where fixing is accomplished by allowing the image to cool.

The liquid layer may be a dispersion, a suspension, or a solution and may be of one or more phases. The liquid layer may be a printing ink such as a mixture of finely divided pigment such as carbon black suspended in a drying oil such as heatbodied linseed oil. Alkyds, phenol-formaldehyde or other synthetic resins and cobalt, manganese, and lead soaps may be added to achieve rapid drying by oxidation and polymerization. Inks which dry by evaporation of a volatile solvent such as mineral oil may be used. For colored inks pigmented or dyed inks such as inks containing chrome yellows, benzidine yellows or lithol reds may be used.

A preferred liquid layer comprises a suspension of carbon black in isopropyl alcohol. This liquid layer is preferred because it gives dark black images and dries rapidly.

To aid transfer blowing agents whether gaseous, liquid or solid may be incorporated into the inks. Blowing agents or foaming agents are those materials which produce an inert gas such as nitrogen or carbon dioxide when heated. Typical blowing agents include pentane, hexane, isohexane, methylene chloride and trichlorotrifluoroethane.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages of this improved method of imaging will become apparent upon consideration of the detailed disclosure of the invention, especially when taken in conjunction with the accompanying drawings wherein:

FIG. 1 shows a side view of a simple exemplary system for carrying out the process of this invention wherein a transparency is placed on the inside of a transparent drum and exposure is made through the transparency. The thickness of the liquid ink layer has been greatly exaggerated for purposes of clarity.

FIG. 2 shows an enlarged cross sectional side view of an exemplary imaging station in accordance with this invention. Sizes and distances have been distorted for purposes of clarity.

Referring now to FIG. 1 there is seen transparent drum 1 which may be for example glass, plastic, or other suitable transparent material. Liquid ink 2 is applied to the surface of drum 1 by applicator roller 3. The thickness and uniformity of liquid ink 2 is controlled by flexible doctor blade 4. A transparency 5 is placed on the inside of transparent drum 1. This arrangement is exemplary, many other arrangements would provide similar results. Preferably the surface of drum 1 is in the form of a gravure or grooved plate, which provides cleaner separation between image and non-image areas. Light source 7 which may be, for example, a laser or other collimated light source and lens 9 are used to provide a high energy source of radiation which is focused in a fine line on the inner surface of liquid ink layer 2. In dark areas of transparency 5 sufficient energy is absorbed to prevent transfer of ink layer 2. In transparent areas of transparency 5 sufficient energy is imparted to liquid ink 2 to cause it to move across the gap to receiver sheet which may be, for example, paper. Receiver sheet 15 in this exemplary instance is entrained over drum 17. A positive image 19, that is the image which has light and dark areas corresponding to light and dark areas of transparency 5 is formed on drum 1. This image may be transferred and retained where desired. Negative image 21, that is the image which has dark areas corresponding to light areas of transparency 5 is formed on the surface of receiver sheet 15.

Referring now to FIG. 2 there is seen a greatly enlarged cross sectional area of a preferred imaging station for use in this invention. Transparent donor layer 23 is provided with small grooves or dimples 25. Grooves 25 are filled with liquid ink 26 and doctored such that when receiving member 27 is placed in contact with donor 23 no ink transfers without the application of light 29 which is focused to a fine line by cylindrical lens 30. Transparency 33 having image areas 34 provides imagewise illumination of the donor member 23.

DESCRIPTION OF PREFERRED EMBODIMENTS The following examples further specifically illustrate the improved imaging process of this invention. All parts and percentages are based on weight unless otherwise stated. The following examples are intended to illustrate various preferred embodiments of the improved imaging process.

EXAMPLE I Approximately 50 parts by weight of finely divided carbon black is dispersed in about 50 parts isopropanol. A glass slide is prepared by placing 3 mil tape on its ends. The space between the tape is coated with about a 25 microns thick layer of the suspension. The slide is placed face down over a piece of paper. The tape provides a gap between the ink and the paper of about 2 mils. A stencil is placed on the top side of the glass. The liquid ink is illuminated through the stencil and glass slide by a flash from a gas discharge lamp which provides an energy level of about 0.4 joules/cm. over a time of about 3 X 10 sec. On separation of the glass slide and paper receiver an image is found on the paper corresponding to the stencil.

EXAMPLE II The experiment of Example I is repeated except that the glass slide is placed ink side up, the paper is placed over the slide and the stencil is placed under the slide. That is the paper, slide, stencil combination of Example I is turned over. The ink is exposed through the stencil as in Example I. An image corresponding to the stencil is again found on the paper. This demonstrates that the ink may be driven against the force of gravity.

EXAMPLE III The experiment of Example I is repeated except that the carbon black is replaced by a carbon black pigmented copolymer of polystyrene and n-butylmethacrylate available as xerographic toner. The image is fixed by application of heat providing a rub'resistant high quality image.

EXAMPLE IV A glass plate is provided having about I50 grooves to the linear inch both horizontally and vertically. The grooves are approximately 3 mils deep providing a raised area of about l0 percent of the total area. The plate is inked with the ink of Example I using a doctor blade which provides an ink level about /2 mil below the level of the raised areas. A smooth surfaced paper receiver sheet is placed in contact with the plate. The liquid ink is illuminated through a stencil as in Example I providing an image on the receiver paper. This image is compared to the image prepared in Example I and found to be of higher resolution evidencing cleaner separation between illuminated and non-illuminated areas.

EXAMPLE V In this Example an opaque black donor member is used and the radiation is directed through the receiver sheet and ink layer before being converted to heat energy by the black donor member. A donor member is' made by forming about 200 parallel grooves per linear inch in black anodized aluminum and at about a right angle to the parallel grooves another about 200 parallel grooves per linear inch are made providing a donor member similar to that of Example IV. The grooves are about 1 mil deep. The inking is doctored so that a /2 mil deep layer of ink is formed in the grooves. A translucent receiver sheet is placed over the inked aluminum donor plate. Illumination is made through a template using infrared radiation of about 0.4 joules/cm. 2 for about 4 X 10 seconds providing an image on the surface of the translucent paper. A

and the image transferred to paper if desired.

EXAMPLES Vl-IX The experiments of Examples I-IV are repeated using an illumination of 0.2 joules/cm. for l X 10 seconds. The images are found not to be of as high quality as those of Examples I-IV.

Although specific components and proportions have been stated in the above description of preferred embodiments of the invention other typical materials as listed above, where suitable, may be used with similar results. In addition, other materials may be added to the ink to synergize, enhance or otherwise modify the properties of the ink. For example, polymerization initiators activated by light may be added to assist the fixing of the final image.

Other modifications and ramifications of the present invention will occur to those skilled in the art upon a reading of the disclosure. These are intended to be included within the scope of this invention.

What is claimed is:

1. An imaging process comprising:

a. providing a donor member;

b. applying a layer of a liquid ink to said donor member;

and,

c. exposing at least a portion of the interface of said liquid ink layer and said donor member to a pattern of electromagnetic radiation until an image is formed by the vapor propulsion of liquid from said donor member.

2. The process of claim 1 including the additional step of:

(1. providing a receiver member to intercept the ink which is removed from said donor member at least prior to or con currently with step (c).

3. The process of claim 1 wherein said electromagnetic radiation is collimated light.

4. The process of claim 1 wherein said donor member comprises a transparent member having recessed areas.

5. The process of claim 1 wherein said donor member comprises an opaque member having recessed areas.

6. The process of claim 1 wherein said ink comprises finely divided particles of pigment dispersed in a liquid.

7. The process of claim 1 wherein said ink comprises a dye solution.

8. The method of claim 1 wherein said donor member is transparent and said radiation is projected through said transparent donor member.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2543047 *May 21, 1947Feb 27, 1951Eastman Kodak CoMethod of printing through cellular plates
US2616961 *Nov 26, 1947Nov 4, 1952Groak JosefPrinting
US3207602 *Dec 29, 1961Sep 21, 1965Minnesota Mining & MfgCopysheet and method for making copies therefrom
US3280735 *Apr 13, 1964Oct 25, 1966Minnesota Mining & MfgHeat-copying process
US3360367 *Mar 15, 1966Dec 26, 1967Minnesota Mining & MfgCopying of graphic images
US3408216 *Dec 2, 1964Oct 29, 1968Xerox CorpImage reproduction
US3446617 *Mar 15, 1966May 27, 1969Minnesota Mining & MfgThermographic copying process
US3455687 *Sep 3, 1965Jul 15, 1969Eastman Kodak CoPhotothermographic copying process
US3490371 *Oct 4, 1965Jan 20, 1970Imagic LtdCopying processes
Non-Patent Citations
Reference
1 *Rositon et al., IBM Technical Disc. Bull., Vol. 7, No. 3, Aug. 1964, page 224.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3787210 *Sep 30, 1971Jan 22, 1974NcrLaser recording technique using combustible blow-off
US3978247 *Jan 28, 1974Aug 31, 1976Rca CorporationTransfer recording process
US4021818 *Sep 22, 1975May 3, 1977Arthur D. Little, Inc.Liquid printing device
US4032691 *Mar 21, 1975Jun 28, 1977Fuji Photo Film Co., Ltd.Insulating, porous resin layer and a thermally deformed metal, dye, or resin
US4080897 *Jan 7, 1977Mar 28, 1978Xerox CorporationSelective tack imaging and printing
US4081653 *Dec 27, 1976Mar 28, 1978Western Electric Co., Inc.Removal of thin films from substrates by laser induced explosion
US4111646 *Jan 24, 1977Sep 5, 1978Armstrong Cork CompanyMethod of no-contact printing of carpet with a transfer sheet
US4312009 *Feb 5, 1980Jan 19, 1982Smh-AdrexDevice for projecting ink droplets onto a medium
US4607267 *Dec 13, 1984Aug 19, 1986Ricoh Company, Ltd.Optical ink jet head for ink jet printer
US4630075 *May 7, 1985Dec 16, 1986Elm Co. Ltd.Cassette-type printing head
US4675694 *Mar 12, 1986Jun 23, 1987Exxon Printing Systems, Inc.Method and apparatus for a high density array printer using hot melt inks
US4725860 *May 14, 1986Feb 16, 1988Kabushiki Kaisha ToshibaInk carrier film in use with ink jet recording device
US4782347 *Mar 31, 1987Nov 1, 1988Canon Kabushiki KaishaRecording head using a plurality of ink storing portions and method of carrying out recording with the use of the same
US4785311 *Jan 27, 1987Nov 15, 1988Canon Kabushiki KaishaRecording head apparatus and method having pluralities of crossed electrodes
US4911733 *Dec 13, 1983Mar 27, 1990Canon Kabushiki KaishaElectrical device; solid pickup element with a plurality of sensors
US5021808 *Oct 6, 1989Jun 4, 1991Kabushiki Kaisha ToshibaLaser actuated recording apparatus
US5045697 *May 24, 1990Sep 3, 1991Man Roland Druckmaschinen AgDirectly image printing or form cylinder, and method of imaging
US5122814 *Sep 7, 1990Jun 16, 1992Canon Kabushiki KaishaBubble jet recording apparatus actuated by interface means
US5159349 *Oct 3, 1991Oct 27, 1992Canon Kabushiki KaishaRecording apparatus which projects droplets of liquid through generation of bubbles in a liquid flow path in response to signals received from a photosensor
US5278023 *Nov 16, 1992Jan 11, 1994Minnesota Mining And Manufacturing CompanyPropellant-containing thermal transfer donor elements
US5342817 *Jun 29, 1992Aug 30, 1994Eastman Kodak CompanyDye receiving element having ridge formed along periphery for receiving dye donor element
US5760808 *Nov 29, 1994Jun 2, 1998Oce Printing Systems GmbhThermoelectric printing unit for transferring an ink onto a recording medium
US6027849 *Mar 23, 1992Feb 22, 2000Imation Corp.Substrate coated with photosensitive layer comprising a radiation absorbing material and polyglycidyl azide capable solvent-free relief image development; printing plates
US6045980 *Sep 27, 1996Apr 4, 2000Leybold Systems GmbhOptical digital media recording and reproduction system
US6309060 *Mar 12, 1999Oct 30, 2001Oce-Technologies B.V.Inkjet printing device, a method of applying hotmelt ink, image-wise to a receiving material and a hotmelt ink suitable for use in such a device and method
US6752488 *Jun 10, 2002Jun 22, 2004Hewlett-Packard Development Company, L.P.Inkjet print head
US7201102 *Jun 28, 2000Apr 10, 2007Oce Printing Systems GmbhMethod and printer device for transferring printing fluid onto a carrier material as well as appertaining printing drum
US8040364Jul 14, 2009Oct 18, 2011Palo Alto Research Center IncorporatedLatent resistive image layer for high speed thermal printing applications
US8487970Oct 3, 2008Jul 16, 2013Palo Alto Research Center IncorporatedDigital imaging of marking materials by thermally induced pattern-wise transfer
DE2858822C2 *Oct 3, 1978Aug 7, 1997Canon KkInk jet printer with nozzle chamber heater
DE2858823C2 *Oct 3, 1978Nov 7, 1996Canon KkVerfahren und Vorrichtung zur Flüssigkeitsstrahl-Aufzeichnung
DE3702643A1 *Jan 29, 1987Aug 13, 1987Toshiba Kawasaki KkTintenstrahlschreiber sowie schreibkopf und schreibkopfkassette dafuer
Classifications
U.S. Classification250/315.3, 347/91, 430/201, 347/224, 250/318, 347/51, 346/140.1
International ClassificationB41M5/46, G03G17/00, B41M5/40, G03G17/04, G03C5/56, B41M5/382, B41M5/26, G03F7/34, G03C5/00, B41J2/05
Cooperative ClassificationB41M5/38207, B41M5/46
European ClassificationB41M5/382A, B41M5/46