US3355308A - Projection transparency having a transparent powder image - Google Patents
Projection transparency having a transparent powder image Download PDFInfo
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- US3355308A US3355308A US42087064A US3355308A US 3355308 A US3355308 A US 3355308A US 42087064 A US42087064 A US 42087064A US 3355308 A US3355308 A US 3355308A
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- 239000000843 powder Substances 0.000 title claims description 16
- 239000012780 transparent material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 description 16
- 239000002904 solvent Substances 0.000 description 9
- 238000000149 argon plasma sintering Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- GBRBMTNGQBKBQE-UHFFFAOYSA-L copper;diiodide Chemical compound I[Cu]I GBRBMTNGQBKBQE-UHFFFAOYSA-L 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000005337 ground glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000012260 resinous material Substances 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/022—Layers for surface-deformation imaging, e.g. frost imaging
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G16/00—Electrographic processes using deformation of thermoplastic layers; Apparatus therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/10—Bases for charge-receiving or other layers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
- G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
Definitions
- This invention relates to xerography, in general, and to the development and display of images, in particular.
- Xerography has become a well-known process for producing copies of printed matter, pictures, writings, and other scenes.
- a xerographic copy comprises a powder image of pigmented resin, or toner, on a support base such as paper, plastics, and the like.
- the support base will be transparent, translucent or opaque, and the toner image viewed by transmitted or reflected light.
- Suitability of a xerographic copy is generally related to the density of the toner image. For instance, a black toner image on white paper must absorb sufiicient light to be readable. Similarly, a xerographically produced transparency must be sufliciently dense to block light projected through it so that the image may be viewed on a projection screen or other imaging surface.
- toner is selectively attracted to the support base by electrostatic forces, it is sometimes difficult to achieve sutficient image density especially when the image is made up of very fine lines. If too little toner is attracted, the copy, or a projection of it, will be lacking in contrast, or even totally unreadable. Hence, imaging independent of toner density is a highly useful contribution to the art.
- a novel xerographic transparency and method for making it are also objects of this invention.
- the present invention requires the use of xerographic toner and image support bases having specially selected properties.
- An especially suitable support base comprises normally transparent material having a light scattering surface.
- a toner image is formed on a xerographic plate and transferred, after a tackifying step, to the light scattering surface of a support base. The transferred toner image is then processed to render the light scattering surface selectively transparent.
- the present invention may be used for making copies directly viewable by reflected light, its probably greater value resides in slides or transparencies viewable by projection.
- FIG. 1 illustrates a light scattering member
- FIG. 2A and FIG. 2B illustrate the process of making the light scattering member selectively transparent
- FIG. 3 illustrates image projection
- FIG. 4 illustrates electrostatic transfer of a xerographic toner image
- FIG. 5 illustrates apparatus and method for continuous reproduction of images
- FIG. 6 illustrates an image web for use in the present invention.
- FIG. 1 illustrates support base 10 made of glass, clear plastic or other normally transparent material.
- One surface of support base 10 must be sufficiently frost-like or reticulated to be substantially light scattering, and such surface is shown in FIG. 1 as image surface 11.
- a suitable support base therefore, may comprise ground glass, ground plastic, frosted polyethylene films, and the like.
- Image surface 11 is preferably sufliciently light diffusing such that if used in a stereopticon or slide projector support base 10 would allow only a small portion of the collimated light directed toward it to reach the viewing screen. Thus, the image areas of surface 11 focused on a viewing screen by the objective lens would appear nearly black.
- FIG. 2A illustrates the first step in rendering support base 10 selectively transparent according to the present invention.
- Image surface 11 is shown in contact with xerographic plate 15 on which has been formed toner image 12.
- Toner image 12 conforms to a document or other original scene, and is formed by any one of a number of methods Well-known to the art of xerography.
- xerographic plate 15 comprising a photoconductive layer 16 overlying conductive backing 17 is uniformly charged in darkness by means :of a corona discharge device. Exposure to a pattern of light and shadow selectively discharges the plate and forms a latent electrostatic image.
- the latent electrostatic image is made visible as toner image 12 by dusting photoconductive layer 16 with finely divided electrically charged resin powder particles.
- the powder particles are charged to a polarity opposite to that of the latent electrostatic image so that the particles are attracted by, and adhere to, charged areas of plate 15.
- like rather than opposite polarities may be selected so that the powder particles will be attracted to the discharged areas of plate 15 instead.
- Other xerographic techniques may be used in place of the one described as the particular method of forming toner image 12 does not constitute a part of this invention.
- powder image 12 is made more tacky or adhesive. This may be done by heating powder image 12, or more desirably, by exposing powder image 12 to the vapors of a volatile liquid which act as a solvent for the resinous material.
- Tackifying toner image 12 with solvent vapor is illustrated by FIG. 2B.
- Support base 15 bearing toner image 12 may be immersed in solvent vapor 18 contained in vapor chamber 19.
- suitable solvents include, but are in no way limited to, chloroform, carbon tetrachloride, trichloroethylene and other chlorinated solvents.
- Aromatic and aliphatic hydrocarbons such as benzene, toluene, gasoline and gasoline fractions, and other alcohols and oxygenated solvents may be used.
- Image surface 11 of support base 10 is simply placed in contact with the tackified image under mild pressure, for example, by pressing with the hands. Plate 15 and support base 10 are then separated and sufficient toner will adhere to image surface 11 for purposes of the present invention.
- support base 10 with toner image 12 on its image surface 11 comprises an image member which may be used as a slide or transparency in a stereopicon, slide projector or other similar viewing device.
- FIG. 3 illustrates one use of an image member made in accordance with the present invention. Converging beam 21, produced from light source 22 by condensing.
- system 25 illuminates image surface 11 of support base 10.
- Objective lens 23 is positioned to focus image surface 11 in an image plane, such as viewing screen 24. Since image surface 11 is transparent in areas of toner image 12, light is transmitted in image configuration and appears on projection screen 24. The non-image areas of image surface 11 remain light scattering and light directed thereon is essentially lost from the optical system. Thus, there is caused to appear on screen 24 a bright display, corresponding to toner image 12, on a dark background.
- toner image 12 comprises a transparent resin or other material which may be softened by heat, vapor solvent, or other controllable element. If desired, the toner material may be dyed. Image contrast is enhanced by using a toner image 12 of nearly the same index of refraction as that of support base 19 although readable images may also be made with other images.
- Commercially available nonpigmented xerogrphic toners have been successfully used in the present invention.
- FIG. 4 illustrates an alternative method for transferring toner image 12 to image surface 11. This embodiment dispenses with the transfer softening step described in connection with FIG. 2.
- Image surface 11 is again shown in contact with xerographic plate 15 hearing toner image 12.
- An electrostatic charge opposite in polarity to that of toner image 12 is applied to the non-diffusing surface 13 of support base 10 by means of charging device 26.
- Any suitable charging device known to the art of xerography may be used, and the one schematically represented in FIG. 4 comprises conductive strand 27 partly surrounded by grounded shield 28. Conductive strand 27 is raised to a high potential by means of power supply 29 resulting in the uniform charging of surface 13 through slit 30 as charging device 26 is moved in the direction shown by the arrow.
- Other suitable devices are described, for example in US. Patents 2,777,- 957 and 2,836,725. Whatever charging method is employed, or whatever other transfer technique is employed, it is only necessary that the attraction of toner image 12 for photoconductive layer 16 be overcome and toner image 12 transferred to image surface 11 of support base 10.
- FIG. illustrates an embodiment for the continuous production of transparencies according to the present invention.
- this embodiment incorporates an electrostatic frosting process to form the light diffusing surface of the transparency, it should be noted that the frosting process may be dispensed with when a pre-frosted image web 32 is used.
- FIG. 6 more clearly illustrates the composition of image web 32.
- web 32 comprises a photoconductive deformable layer 33 overlying support layer 34. Both layers are necessarily flexible and transparent.
- a thin transparent conductive layer 35 need be incorporated into the structure only if support layer 34 is electrically non-conductive.
- a highly suitable web 32 may comprise a support layer 34 of Mylar polyester film (E. I. du Pont de Nemours & Co.), copper iodide layer 35, and a photoconductive deformable layer 33 of a photoconductor corresponding to Formula 2 of Canadian Patent No. 568,707 mixed with Staybelite 10 (Hercules Powder Company).
- image web 32 is fed from supply roll 37 through various process stations.
- a light diffusing surface is first imported to web 32 in the manner fully described in copending patent application Ser. No. 193,277, now Patent No. 3,196,011. Successive portions of web 32 are electrostatically charged in the absence of light by means of corona charging device 38 which is connected to high voltage power supply 39. Deformable layer 33 is next softened so that it becomes physically altered by the mechanical force associated with the electrical field existing across layer 33 as a result of the aforementioned charging. Softening is most commonly done by exposing web 32 to an atmosphere of solvent vapors for the materials of layer 33, or by heating as illustrated in FIG. 5. Heating element 53 is shown positioned below web 32.
- layer 33 As the material of layer 33 is softened it is enabled to flow in response to the electrostatic forces acting upon it, and the softened layer 33 develops a microscopically uneven surface having a frosted appearance.
- This surface is sufficiently light diffusing for use in the present invention. It is referred to as image surface 40 in connection with the remaining steps shown in FIG. 5.
- Successive portions of web 32 are again electrostatically charged in the absence of light, as schematically represented by charging device 41 connected to high voltage power supply 42.
- Web 32 is then exposed to a light and shadow pattern of a document 43, or other original, for example, by projection of reflected light 44 from lamp 45 through lens 46. Since layer 33 is photoconductive, exposure causes selective dissipation of the electrostatic charge leaving a latent electrostatic image which may be developed or made visible at xerographic developing stattion 50.
- toner image 51 is appropriately softened to create an intimate bond between individual particles and with image surface 40.
- image web 32 passes through focusing chamber 55 in which it is exposed to an atmosphere to solvent vapors for toner image 51.
- image web 32 is suitable for use as a transparency for the projection display of the image thereon.
- image web 32 may be stored for later use as on roller 67, or it may pass through viewing station 60 for quick projection display as illustrated in FIG. 5.
- image surface 40 is illuminated by convergent beam 61 produced from light source 63 by condensing system 62. Light is freely transmitted by the transparent or image areas of image surface 40 but is nearly completely blocked by diffusion as the non-transparent or non-image areas. There results a high contrast projected image on screen 64.
- a projection transparency comprising:
- a projection slide comprising:
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing Agents For Electrophotography (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
Description
Nov. 28, 1967 L. E. WALKUP 3,355,308
1 PROJECTION TRANSPARENCY HAVING A TRANS-PARENT POWDER IMAGE Original Filed June 24, 1963 2 Sheets-Sheet 1 FIG. 1 IN i as a:
J4 Fl 6. 6
l 1 "1i mvsmon I2 I; LEWIS c. WALKUP PROJECTION TRANSPARENCY HAVING A TRANSPARENT POWDER IMAGE Original Filed June 24, 1963 2 Sheets-Sheet 2 Nov. 28, 1967. E. WALKUP 3,355,308
WQ. 1 64 in: j Cg) gag: Q J 2,; 5r
4, W as 44 A A l A l (4? T T INVENTOR. 5 LEWIS LKUP United States Patent 3,355,308 PRGJECTION TRANSPARENCY HAVING A TRANSPARENT POWDER IMAGE Lewis E. Walkup, Columbus, Ohio, assignor, by mesne assignments, to Xerox Corporation, Rochester, N.Y., a corporation of New York Original application June 24, 1963, Ser. No. 289,904, now Patent No. 3,196,765. Divided and this application Dec. 24, 1964, Ser. No. 42i),87tl
3 Qiaims. (Cl. 117-9) This application is a division of my copending application Ser. No. 289,904, led June 24, 1963, now Patent No. 3,196,765.
This invention relates to xerography, in general, and to the development and display of images, in particular.
Xerography has become a well-known process for producing copies of printed matter, pictures, writings, and other scenes. Typically, a xerographic copy comprises a powder image of pigmented resin, or toner, on a support base such as paper, plastics, and the like. Depending upon the particular application, the support base will be transparent, translucent or opaque, and the toner image viewed by transmitted or reflected light.
Suitability of a xerographic copy is generally related to the density of the toner image. For instance, a black toner image on white paper must absorb sufiicient light to be readable. Similarly, a xerographically produced transparency must be sufliciently dense to block light projected through it so that the image may be viewed on a projection screen or other imaging surface.
Because the toner is selectively attracted to the support base by electrostatic forces, it is sometimes difficult to achieve sutficient image density especially when the image is made up of very fine lines. If too little toner is attracted, the copy, or a projection of it, will be lacking in contrast, or even totally unreadable. Hence, imaging independent of toner density is a highly useful contribution to the art.
Accordingly, a new and improved method of xerographic imaging independent of toner density is an object of this invention.
A novel xerographic transparency and method for making it are also objects of this invention.
Other objects of this invention include: high resolution image projection; high contrast image projection; the application of xerography to reduced size image pr0jection; quick display of optical images, and novel apparatus therefore.
As explained in detail below, the present invention requires the use of xerographic toner and image support bases having specially selected properties. An especially suitable support base comprises normally transparent material having a light scattering surface. According to one embodiment of the present invention, a toner image is formed on a xerographic plate and transferred, after a tackifying step, to the light scattering surface of a support base. The transferred toner image is then processed to render the light scattering surface selectively transparent. Although the present invention may be used for making copies directly viewable by reflected light, its probably greater value resides in slides or transparencies viewable by projection. These and other embodiments of the present invention are described in detail in connection with the drawing in which:
FIG. 1 illustrates a light scattering member;
FIG. 2A and FIG. 2B illustrate the process of making the light scattering member selectively transparent;
FIG. 3 illustrates image projection;
FIG. 4 illustrates electrostatic transfer of a xerographic toner image;
FIG. 5 illustrates apparatus and method for continuous reproduction of images; and,
FIG. 6 illustrates an image web for use in the present invention.
FIG. 1 illustrates support base 10 made of glass, clear plastic or other normally transparent material. One surface of support base 10 must be sufficiently frost-like or reticulated to be substantially light scattering, and such surface is shown in FIG. 1 as image surface 11. A suitable support base, therefore, may comprise ground glass, ground plastic, frosted polyethylene films, and the like. Image surface 11 is preferably sufliciently light diffusing such that if used in a stereopticon or slide projector support base 10 would allow only a small portion of the collimated light directed toward it to reach the viewing screen. Thus, the image areas of surface 11 focused on a viewing screen by the objective lens would appear nearly black.
FIG. 2A illustrates the first step in rendering support base 10 selectively transparent according to the present invention. Image surface 11 is shown in contact with xerographic plate 15 on which has been formed toner image 12. Toner image 12 conforms to a document or other original scene, and is formed by any one of a number of methods Well-known to the art of xerography. For instance, according to one well-known method, xerographic plate 15 comprising a photoconductive layer 16 overlying conductive backing 17 is uniformly charged in darkness by means :of a corona discharge device. Exposure to a pattern of light and shadow selectively discharges the plate and forms a latent electrostatic image. The latent electrostatic image is made visible as toner image 12 by dusting photoconductive layer 16 with finely divided electrically charged resin powder particles. Usually, the powder particles are charged to a polarity opposite to that of the latent electrostatic image so that the particles are attracted by, and adhere to, charged areas of plate 15. However, if desired for a particular application, like rather than opposite polarities may be selected so that the powder particles will be attracted to the discharged areas of plate 15 instead. Other xerographic techniques may be used in place of the one described as the particular method of forming toner image 12 does not constitute a part of this invention.
To facilitate transfer of toner image 12 to image surface 11 of support base 10, powder image 12 is made more tacky or adhesive. This may be done by heating powder image 12, or more desirably, by exposing powder image 12 to the vapors of a volatile liquid which act as a solvent for the resinous material.
Image surface 11 of support base 10 is simply placed in contact with the tackified image under mild pressure, for example, by pressing with the hands. Plate 15 and support base 10 are then separated and sufficient toner will adhere to image surface 11 for purposes of the present invention.
It has been found that support base 10 with toner image 12 on its image surface 11 comprises an image member which may be used as a slide or transparency in a stereopicon, slide projector or other similar viewing device.
FIG. 3 illustrates one use of an image member made in accordance with the present invention. Converging beam 21, produced from light source 22 by condensing.
As used in the present invention, toner image 12 comprises a transparent resin or other material which may be softened by heat, vapor solvent, or other controllable element. If desired, the toner material may be dyed. Image contrast is enhanced by using a toner image 12 of nearly the same index of refraction as that of support base 19 although readable images may also be made with other images. Commercially available nonpigmented xerogrphic toners have been successfully used in the present invention.
FIG. 4 illustrates an alternative method for transferring toner image 12 to image surface 11. This embodiment dispenses with the transfer softening step described in connection with FIG. 2.
Image surface 11 is again shown in contact with xerographic plate 15 hearing toner image 12. An electrostatic charge opposite in polarity to that of toner image 12 is applied to the non-diffusing surface 13 of support base 10 by means of charging device 26. Any suitable charging device known to the art of xerography may be used, and the one schematically represented in FIG. 4 comprises conductive strand 27 partly surrounded by grounded shield 28. Conductive strand 27 is raised to a high potential by means of power supply 29 resulting in the uniform charging of surface 13 through slit 30 as charging device 26 is moved in the direction shown by the arrow. Other suitable devices are described, for example in US. Patents 2,777,- 957 and 2,836,725. Whatever charging method is employed, or whatever other transfer technique is employed, it is only necessary that the attraction of toner image 12 for photoconductive layer 16 be overcome and toner image 12 transferred to image surface 11 of support base 10.
Atlhough carrying out the steps just described in connection with FIG. 4 will produce an image member suitable for projection purposes, it has been found that an additional fusing step results in a superior slide or transparency. Fusing of the transferred toner image 12 may be accomplished in the manner of transfer softening described in connection with FIG. 2B. It is believed that the fusing step causes the powder comprising toner image 12 to fill in the tiny pockets of image surface 11 thereby removing the diffusing property of those areas and rendering them highly transparent. Image members having fused toner images have been found to produce projection images that are of higher contrast and much brighter than images produced by image members having non-fused toner images.
FIG. illustrates an embodiment for the continuous production of transparencies according to the present invention. Although this embodiment incorporates an electrostatic frosting process to form the light diffusing surface of the transparency, it should be noted that the frosting process may be dispensed with when a pre-frosted image web 32 is used.
To fully describe the present invention, reference is first made to FIG. 6 which more clearly illustrates the composition of image web 32. As shown, web 32 comprises a photoconductive deformable layer 33 overlying support layer 34. Both layers are necessarily flexible and transparent. A thin transparent conductive layer 35 need be incorporated into the structure only if support layer 34 is electrically non-conductive.
Specifically, a highly suitable web 32 may comprise a support layer 34 of Mylar polyester film (E. I. du Pont de Nemours & Co.), copper iodide layer 35, and a photoconductive deformable layer 33 of a photoconductor corresponding to Formula 2 of Canadian Patent No. 568,707 mixed with Staybelite 10 (Hercules Powder Company).
Referring to FIG. 5, image web 32 is fed from supply roll 37 through various process stations.
A light diffusing surface is first imported to web 32 in the manner fully described in copending patent application Ser. No. 193,277, now Patent No. 3,196,011. Successive portions of web 32 are electrostatically charged in the absence of light by means of corona charging device 38 which is connected to high voltage power supply 39. Deformable layer 33 is next softened so that it becomes physically altered by the mechanical force associated with the electrical field existing across layer 33 as a result of the aforementioned charging. Softening is most commonly done by exposing web 32 to an atmosphere of solvent vapors for the materials of layer 33, or by heating as illustrated in FIG. 5. Heating element 53 is shown positioned below web 32. As the material of layer 33 is softened it is enabled to flow in response to the electrostatic forces acting upon it, and the softened layer 33 develops a microscopically uneven surface having a frosted appearance. This surface is sufficiently light diffusing for use in the present invention. It is referred to as image surface 40 in connection with the remaining steps shown in FIG. 5.
Successive portions of web 32 are again electrostatically charged in the absence of light, as schematically represented by charging device 41 connected to high voltage power supply 42.
The developing method known in the art of xerography as cascade development is highly suitable for the present invention and is fully described in US. Patents 2,618,551; 2,618,552; and 2,638,416. A mixture of tiny electrically charged resin toner particles and grossly larger carrier material is cascaded or poured across image surface 40 of web 32. Powder cloud developement or liquid development, as known to the art, are also useful developing systems depending on the image being formed. According to the illustrated embodiment, the resin particles are attracted by and adhere to the charged areas of image web 32 forming toner image 51.
In a manner similar to that explained in connection with FIGS. 2 and 4, toner image 51 is appropriately softened to create an intimate bond between individual particles and with image surface 40. As illustrated in FIG. 5, image web 32 passes through focusing chamber 55 in which it is exposed to an atmosphere to solvent vapors for toner image 51. Thus rendered selectively transparent in image configuration, image web 32 is suitable for use as a transparency for the projection display of the image thereon. After it leaves fusing chamber 55, image web 32 may be stored for later use as on roller 67, or it may pass through viewing station 60 for quick projection display as illustrated in FIG. 5. At viewing station 60 image surface 40 is illuminated by convergent beam 61 produced from light source 63 by condensing system 62. Light is freely transmitted by the transparent or image areas of image surface 40 but is nearly completely blocked by diffusion as the non-transparent or non-image areas. There results a high contrast projected image on screen 64.
Various modifications and adaptations of the present invention are within the capability of those skilled in the art. Therefore, it is intended that the following claims be interpreted broadly to cover all embodiments of the present invention as well as the specific embodiments illustrated herein.
What is claimed is:
1. A projection transparency comprising:
(a) a support member of normally transparent material having a light diffusing surface; and
(b) a transparent powder image on said surface.
2. A projection slide comprising:
(a) a support member or normally transparent material having a reticulated light-scattering surface; and,
(b) a transparent fused powder image on said surface.
3. A projection slide according to claim 2 in which said powder image and said support member have substantially the same indexes of refraction.
References Cited UNITED STATES PATENTS 584,107 6/1897 Brown 1611 789,697 5/1905 Kyle 161--5 874,885 12/1907 Dodge 161-1 1,580,921 4/1926 Scherer 1179 1,973,792 11/1930 Barrows 1611 2,362,980 9/1941 Ball 16l6 2,386,626 10/1945 Nadeau et a1. 11'729 2,545,896 1/1948 Pipkin 117-18 2,682,478 6/1954 Howsc 11723 2,719,098 9/1955 Goldman 881 2,818,354 12/1957 Pritikin et a1. 117-159 3,108,895 10/1963 Howell et a1. 11717.5 X 3,113,179 12/1963 Glenn 117-17.5 X 3,147,136 9/1964 Huttenbach et a1. 1l7159 864,387 8/1907 Pfister 11723 X 2,444,863 7/1948 Tornberg 11713 2,681,473 6/1954 Carlson 11717.5 X 2,992,937 7/1961 Davis 117-13 3,241,957 3/1966 Fauser et a1. 1l737 X WILLIAM D. MARTIN, Primary Examiner.
Assistant Examiners.
Claims (1)
1. A PROJECTION TRANSPARENCY COMPRISING: (A) A SUPPORT MEMBER OF NORMALLY TRANSPARENT MATERIAL HAIVNG A LIGHT DIFFUSING SURFACE; AND (B) A TRANSPARENT POWDER RINGS ON SAID SURFACE.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US42087064 US3355308A (en) | 1963-06-24 | 1964-12-24 | Projection transparency having a transparent powder image |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US28990463 US3196765A (en) | 1963-06-24 | 1963-06-24 | Image development and projection |
US42087064 US3355308A (en) | 1963-06-24 | 1964-12-24 | Projection transparency having a transparent powder image |
Publications (1)
Publication Number | Publication Date |
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US3355308A true US3355308A (en) | 1967-11-28 |
Family
ID=26965905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US42087064 Expired - Lifetime US3355308A (en) | 1963-06-24 | 1964-12-24 | Projection transparency having a transparent powder image |
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US (1) | US3355308A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3514305A (en) * | 1965-10-20 | 1970-05-26 | Us Plywood Champ Papers Inc | Reproduction of images from printed surfaces |
US3854942A (en) * | 1972-03-21 | 1974-12-17 | Xerox Corp | Transparency for multi-color electrostatic copying |
EP2101200A1 (en) * | 2008-03-14 | 2009-09-16 | Oki Data Corporation | Lenticular lens medium |
US8190042B1 (en) | 2008-05-16 | 2012-05-29 | Oki Data Americas, Inc. | Electrophotographic printing apparatus |
Citations (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US584107A (en) * | 1897-06-08 | Colored flashed ornamental glass | ||
US789697A (en) * | 1902-05-29 | 1905-05-09 | Joseph D Kyle | Decoration and process of making same. |
US864387A (en) * | 1906-04-25 | 1907-08-27 | Theophil Pfister | Method of making decorative cloisonne designs. |
US874885A (en) * | 1906-08-30 | 1907-12-24 | Ozias Dodge | Film. |
US1580921A (en) * | 1925-02-10 | 1926-04-13 | Scherer Adolph | Method of ornamenting articles |
US1973792A (en) * | 1930-11-07 | 1934-09-18 | Donald S Barrows | Translucent panel |
US2362980A (en) * | 1941-09-02 | 1944-11-21 | Walt Disney Prod | Cartoon cell and method of making same |
US2386626A (en) * | 1943-01-30 | 1945-10-09 | Eastman Kodak Co | Drawing surface |
US2444863A (en) * | 1945-06-28 | 1948-07-06 | Dadson Entpr Inc | Method for mechanically simulating genuine oil paintings |
US2545896A (en) * | 1947-02-15 | 1951-03-20 | Gen Electric | Electric lamp, light diffusing coating therefor and method of manufacture |
US2681473A (en) * | 1948-12-30 | 1954-06-22 | Chester F Carlson | Manufacture of plaques and the like |
US2682478A (en) * | 1950-09-11 | 1954-06-29 | Technicolor Motion Picture | Method of forming television screens |
US2719098A (en) * | 1953-05-11 | 1955-09-27 | Westinghouse Electric Corp | Ground glass surfaces with protective and stabilizing thermoset polysiloxane coating |
US2818354A (en) * | 1954-12-17 | 1957-12-31 | Pritikin | Electrical resistor and method of making same |
US2992937A (en) * | 1958-03-19 | 1961-07-18 | Itt | Film printing |
US3108895A (en) * | 1959-12-24 | 1963-10-29 | Burroughs Corp | Method and apparatus for erasing developed images |
US3113179A (en) * | 1957-11-22 | 1963-12-03 | Gen Electric | Method and apparatus for recording |
US3147136A (en) * | 1961-01-11 | 1964-09-01 | Owens Illinois Glass Co | Process for forming a grit-blasted and methyl methacrylate-epoxy resin coated glass surface |
US3241957A (en) * | 1961-06-08 | 1966-03-22 | Harris Intertype Corp | Method of developing electrostatic images and liquid developer |
-
1964
- 1964-12-24 US US42087064 patent/US3355308A/en not_active Expired - Lifetime
Patent Citations (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US584107A (en) * | 1897-06-08 | Colored flashed ornamental glass | ||
US789697A (en) * | 1902-05-29 | 1905-05-09 | Joseph D Kyle | Decoration and process of making same. |
US864387A (en) * | 1906-04-25 | 1907-08-27 | Theophil Pfister | Method of making decorative cloisonne designs. |
US874885A (en) * | 1906-08-30 | 1907-12-24 | Ozias Dodge | Film. |
US1580921A (en) * | 1925-02-10 | 1926-04-13 | Scherer Adolph | Method of ornamenting articles |
US1973792A (en) * | 1930-11-07 | 1934-09-18 | Donald S Barrows | Translucent panel |
US2362980A (en) * | 1941-09-02 | 1944-11-21 | Walt Disney Prod | Cartoon cell and method of making same |
US2386626A (en) * | 1943-01-30 | 1945-10-09 | Eastman Kodak Co | Drawing surface |
US2444863A (en) * | 1945-06-28 | 1948-07-06 | Dadson Entpr Inc | Method for mechanically simulating genuine oil paintings |
US2545896A (en) * | 1947-02-15 | 1951-03-20 | Gen Electric | Electric lamp, light diffusing coating therefor and method of manufacture |
US2681473A (en) * | 1948-12-30 | 1954-06-22 | Chester F Carlson | Manufacture of plaques and the like |
US2682478A (en) * | 1950-09-11 | 1954-06-29 | Technicolor Motion Picture | Method of forming television screens |
US2719098A (en) * | 1953-05-11 | 1955-09-27 | Westinghouse Electric Corp | Ground glass surfaces with protective and stabilizing thermoset polysiloxane coating |
US2818354A (en) * | 1954-12-17 | 1957-12-31 | Pritikin | Electrical resistor and method of making same |
US3113179A (en) * | 1957-11-22 | 1963-12-03 | Gen Electric | Method and apparatus for recording |
US2992937A (en) * | 1958-03-19 | 1961-07-18 | Itt | Film printing |
US3108895A (en) * | 1959-12-24 | 1963-10-29 | Burroughs Corp | Method and apparatus for erasing developed images |
US3147136A (en) * | 1961-01-11 | 1964-09-01 | Owens Illinois Glass Co | Process for forming a grit-blasted and methyl methacrylate-epoxy resin coated glass surface |
US3241957A (en) * | 1961-06-08 | 1966-03-22 | Harris Intertype Corp | Method of developing electrostatic images and liquid developer |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3514305A (en) * | 1965-10-20 | 1970-05-26 | Us Plywood Champ Papers Inc | Reproduction of images from printed surfaces |
US3854942A (en) * | 1972-03-21 | 1974-12-17 | Xerox Corp | Transparency for multi-color electrostatic copying |
EP2101200A1 (en) * | 2008-03-14 | 2009-09-16 | Oki Data Corporation | Lenticular lens medium |
EP2101199A1 (en) * | 2008-03-14 | 2009-09-16 | Oki Data Corporation | Lenticular lens medium |
US20090231717A1 (en) * | 2008-03-14 | 2009-09-17 | Oki Data Corporation | Lenticular lens medium |
US20090231716A1 (en) * | 2008-03-14 | 2009-09-17 | Oki Data Corporation | Lenticular lens medium |
US7852563B2 (en) | 2008-03-14 | 2010-12-14 | Oki Data Corporation | Lenticular lens medium |
US7872805B2 (en) | 2008-03-14 | 2011-01-18 | Oki Data Corporation | Lenticular lens medium |
US8190042B1 (en) | 2008-05-16 | 2012-05-29 | Oki Data Americas, Inc. | Electrophotographic printing apparatus |
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