CA1145980A - Electrophotographic slide and method of making same - Google Patents
Electrophotographic slide and method of making sameInfo
- Publication number
- CA1145980A CA1145980A CA000370221A CA370221A CA1145980A CA 1145980 A CA1145980 A CA 1145980A CA 000370221 A CA000370221 A CA 000370221A CA 370221 A CA370221 A CA 370221A CA 1145980 A CA1145980 A CA 1145980A
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- Prior art keywords
- film
- slide
- electrophotographic
- panel
- panels
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Abstract
JJD:hph ELECTROPHOTOGRAPHIC SLIDE AND
METHOD OF MAKING SAME
ABSTRACT
An improved slide for electrophotographic film which comprises a pair of slide frame forming panels hingedly connected along adjacent edges enabling the panels to be folded together in superposed relation. The inner surfaces of each panel is coated with a pressure sensitive adhesive which bonds an electrophotographic film to one panel. A transparent pro-tective film or a second photographic film may be bonded to the other panel. A conductive foil strip is affixed along an edge of the film for providing a grounding contact required for imaging the film in 3 duplicating camera and a release paper is disposed over the adhesive coating of the other panel. Sub-sequent to imaging, a slide is formed by stripping off the release paper and folding the panels so that the adhesive coating bonds the inner surface together with the film being retained therebetween.
METHOD OF MAKING SAME
ABSTRACT
An improved slide for electrophotographic film which comprises a pair of slide frame forming panels hingedly connected along adjacent edges enabling the panels to be folded together in superposed relation. The inner surfaces of each panel is coated with a pressure sensitive adhesive which bonds an electrophotographic film to one panel. A transparent pro-tective film or a second photographic film may be bonded to the other panel. A conductive foil strip is affixed along an edge of the film for providing a grounding contact required for imaging the film in 3 duplicating camera and a release paper is disposed over the adhesive coating of the other panel. Sub-sequent to imaging, a slide is formed by stripping off the release paper and folding the panels so that the adhesive coating bonds the inner surface together with the film being retained therebetween.
Description
~S~38~
The use of slide transparencies has in recent years become increasingly popular, particularly in the field of visual communications. Those involve~ in the dissemination of ideas for such purposes as educational courses and business, professional and governmental semi-nars are continually seeking new ways to present infor-mation visually. One of the most convenient and readily available techniques for such presentation involves the use of standard 35 mm slide transparencies. For maximum utilization of such slide transparencies a simple and convenient method must be available for reproducing variou~
printed materials as projectable images on slide transparen-cies.
While silver halide and diazo film have been used in making such slide transparencies, the imaging and de-veloping processes for such film are generally time con-suming and require trained operators. On the other hand, electrophotography while capable of producing e~cellent high resolution images in a convenient and economical manner, lacks effective methods and means for utilizing electrophotographic film in slide transparencies projec-table in 35 mm projectors.
The only commercially available electrophotogra-phic slide processing system employs fully mounted sllde frames. These frames consist of a film laminated between two window apertured paperboard frames, the plane of the film being recessed inwardly of the outer surface of the frames. A hole is provided through one of the frames for 38~
contact with the photoconductive layer of the film~ In the use of these slides some imaging deficiencies have been encountered, particularly along the outer edges of the film adjacent the window edge of the frame. It is believed this difficulty results from the surface tension of the liquid toner which is applied at the toning head of the slide processor system. Inasmuch as the outer surfaces of the frame and filrn are not coplanar, there is a ten-dency due to surface tension for the toner to bridge areas of the film adjacent the edges of the frame. At-tempts to alleviate this problem have involved the use of paperboard frames sufficiently absorbent to wick up the toner liquid so that the full imaging potential of the film area is utilized. Unfortunately~ the frames remain wet or damp as they emerge from the processor ~nit and tend to warp on drying. As a consequence, it has been the prac-tice to make these frames considerably thicker than the standard 35 mm photographic slide used in the most commer-cially popular slide projectors, thereby mandating the use of less popular slide projectors or projectors espe-cially adapted for use with these particular slide frames.
Furthermore, this non-coplanar configuration of such prior art slides renders it inconvenien-t if not im-possible to place such slides in surface-to-surface contact with other photographic films such as silver halide or diazo films. Such surface-to-surface contact is desira-ble for exarnple in the reproduction of an electrophoto-graphic filrn image onto another type of film or in the superpositioning and simultaneous projection of an elec-trophotographic film image and a second background image.
~s~
It is the principal object of this invention to provide slide transpareneies eonstrueted for use in an eleetrophotographic slide processor which overcome the drawbaeks of eommereially available slide transparencies.
Another object of this invention is to provide slide transparencies of open frame construction wherein the electrophotographic film provides a wholly planar surface for imaging and toning.
It is a further objeet of this invention to provide slide transparencies of the above type wherein the planar proeessing surface is provided with a fully exposed electrieally eonduetive layer.
Yet another object of this invention is to pro-vide a slide transpareney frame construetion whieh lends itself to efficient and economical manufacturing proeedu-res, each of use in a slide proeessor unit and after pro-eessing is readily converted to a fully mounted slide frame for projection in standard 35 mm slide projectors.
A further object of the present invention is to provide such a slide transpareney whieh ean be assembled without heat sealing.
It is another objeet of the present invention to provide a slide transpareney of the above type wherein the transpareney image may be eonveniently eontact du-plieated onto another photographie film sueh as a diazo or silver halide eolor film.
~ . .
It is yet a further object to provide a slide transparency in which images on a pair oE ~ilm surfaces are disposed in superposed registration with one another for simultaneous projection of a composite image.
In accordance with a particular embodiment of the invention there is provided a slide transparency for electrophotographic film which includes an electrically conductive layer comprising a generally planar frame including a pair of panels defined by a hinge therebetween.
Each panel lies in generally the same plane before folcl-ing and each has a window shape projection aperture therethrough registrable when the panels are folded together about the hinge. The ~irst of these panels has an electrographic film disposed thereon spanning the window aperture therein, while the inner surface of the - second panel has an adhesive thereon ~or bonding the two panels together in superposed relation when ~olded about the hinge. An electrically conductiva strip is disposed on the film for grounding the electrically conductive layer of the film when imaging the film before the frame is ~olded.
From a difEerent aspect, an embodiment o~ the invention comprises a me~hod of fabricating slide trans-parencies for electrophotographic film. The method includes the steps o~ cutting and scoring an elongated strip o~ sheet material with two laterally spaced rows oE
rectangular apertures. m e apertures in each row are disposed on opposite sides of a fold line extending from end to end of the strip. The apertures in each row are longitudinally spaced and disposed to register with the apertures oE the other row. The method further includes the steps of laminating the length o~ the electrophotographic film onto the strip in spanning relation to one o~ the rows of apertures. The ~ilm has a grounding strip of electricall~ conductive m~terial carried along the edge of the film. The method still -4a-further includes the step of transversely sever:ing the unitary strip between adjacent apertures of rows whereby a plurality of individual slide transparencies are obtained.
mese and other objects will become more readily apparent from the following detailed description taken in connection with the accompanying drawings wherein:
Fig, 1 is a perspective view of an electro-photographic slide frame transparency of open, foldable construction embodying this invention, Fig. 2 is a sectional view on an enlarged scale taken along line ~-2 of Fig. 1, Fig~ 3 is a partial elevational view of a modified form of the slide transparency of the present invention' Fib. 4 is a plan view of continuous strip of slide frame transparencies of the type embodying this invention, and Fig. 5 is a perspective view of a fully mounted slide transparency.
Re~erring to the drawings and particularly to Figs. 1-3, an electrophotographic film transparency of open, foldable construction is shown generally at 10 and comprises a pair of relatively rigid panels 15 and 20 having window apertures. The panels are foldable along fold or score line 25 to foxm a slide mount. A strip of electrophotographic film 30 is laminated in , 3~
edge-to-edge relati3n on the inner surface of the panel 15.
A conductive str;p 35 is bonded onto f~lm 30 in contact with the photoconductive layer of the film. The inner surface of panel 20 is coated with a pressure sensitive adhesive 40 ~Fig. 2), which is covered by release paper 45 and in the embodiment shown a transparent cover sheet 32 such as acetate or polyester is carried on the outer surface of panel 20 to protect unfixed images on the film 30 when the panels are folded together. The protective film 32 renders unnecessary the fixa-tion of image as by use of a xenon flash. A photographic film transpareney 33 may be disposed in the inner surface of panel Z0 so that its image side will contact the image side of film 30 when the frame panels are folded together. Film transparency 33 may be any suitable type of fi~m imaged for composite projection with the image on the film 30.
For imaging of the electrophotographi c film as describèd in my copending Application Serial No. 938, 695 for "Electrophotographic Apparatus", filed-August 31, 1978, now US Patent No. 4202~19 issued May 13, 1980, the photoconductive layer of the film 30 is charged as by a corona, imaged by a light source and then toned as with a toner comprising a liquid carrying suspension of toner particles of carbon black or the like. The toned image may then be "fixed" as with a xenon flash. After imaging a slide transparency mount is formed by removal of the release paper and the folding together of the tw~ p~nels so that the film is permanently laminated between the frame panels as shown in Fig. 5.
Panel~ 15 and 20 are formed from a relatively rigid material such as paperboard, synthetic plastic or the like with a fold or hinge 11ne 25 disposed midway between the outer ends ,, of the panels so that when folded together the panels will register in superposed edye-to-edge relation to form a fully mounted slide7 preferably of standard (35 mm) size.
Each panel includes a window ~8 and ~9 which are adapted to coincide when the panels are folded together. As best seen in Fig. 1, the dimensions of window 4~, such that when the frame members are folded together, the ed~es of window 48 lie within and parallel to the e~ges of window 49.
This coaxial window arrangement insures full unimpeded projection of images on the film 30, particularly those portions adjacent the edges of the window ~8 should the windows become somehow misaligned.
As be~t shown in Fig. 2, the inner surface of the frame panels is coated with pressure sensitive ad-hesive 40 which on panel 20 is protected by release strip45. In the preferred embodiment film 30 is generally co-extensive with edges of panel lS and is laminated onto the inner surface thereof by the adhesive 40. The inner edge of the film is spaced slightly from hinge line 25 so as not to interfere with the folding of the frame panels.
The film 30 and release paper meet along a line 41 adjacent hinge 25 on panel 15~ The upper surfaces of the film and paper are generally coplanar, thus providing a smooth uniform surface which facilitates handling and imaging of the film in a slide processor system.
Conductive strip 35 or other suitable conductive means is disposed along the outer edge of the film 30 opposite hinge line 25. I'he conductive strip may be any electrically conductive material such as a metallic foil which is bonded by an electrically conductive adhesive onto the film and in contact with the electrically conductive layer of the film 30 shown on an , enlarged scale at 55 in Fig. 3. The film illus-trated also ineludes a base layer 50 and photoeonducting layer 60.
The foil 35 enables grounding during imaging of the layer 55 to the frame of the processing equipment. This is aecomplished by scribing the upper surface of strip 35, preferably aluminum foil, sufficiently to cause portions of the foil to penetrate the upper film layer and contact the e~nduetive layer 5~. During fabrication of the side frames, the foil is seribed by a mechanism which depresses a plurality of laterally spaced seribe marks 63, as best illustrated in Figs. 1 and 3. This eonstruetion insures grounding of the eleetrieally eonduetive layer 55 during eorona charging of the photoeonduetive layer 60.
An alternate embodiment of the grounding strip 35 is shown at 135 in Fig. 3. The strip 135 may be a me-tallic foil whieh is folded over the outer edge portion frame panel 15 and may be scribed as at 63 for contact with the electrieally eonductive layer 55 of the film 30 in the same manner as foil 35. This eons-truetion while requiring the use of greater quantities of metal foil may be advantageous for firmly bonding the grounding strip to the edge of the slide frame.
Film 33 as discussed above may be an imaged pho-tographic film sueh as a diazo, silver halide or a seeond strip of eleetrophotographie film sueh that when panels 15 and 20 are folded together, films 30 and 33 are dis-posed in surfaee-to-surfaee contaet with one another for eomposite projeetion. Film 33 may be a diazo eolor film and after development remain as part of the transparency as a baekground image simulataneously projectable with the image on the photoeonductive film.
~5~3BO
The structural characteristics of slides embodying this invention are such that the slides may be fabricated by mass production techniques. As illustrated in Fig. 49 a continuous strip or web 75 of fiberboard material is coated with a suitable pressure sensitive adhesive 40 which in turn is covered with a suitable release paper. The transparency frame is then punched and creased to form a plurality of spaced windows 48 and 49 on opposite sides of fold line 25. The release paper overlying the strip in which windows 48 have been cut is then removed and a strip of electrophotographic film is mounted on the exposed pressure sensitive adhesive. In the preferred embodiment, film strip 130 to which conductive strip 235 has been previously bonded is then mounted onto the card stock. The conductive foil strip is bonded onto the edge of the film strip using an electrically conductive adhesive and by a scribing technique the foil is made to penetrate the film and contact the conductive layer.
The inner edges of the film strip 130 and the release strip 145 abut along line 41 spaced ~ om hinge line 25 toward windows 48. The outer surface of the strip 75 may be laminated with a trans-parent protecti~7e strip 132. Strip 132 is only appLied on side-frames fabricated for use in a slide processor in which the image will remain "unfixed", thus being subject to smudging or : - . .
' . . . ~ - . - .
::
eradication with careless handlingn For slides adapted to be used in slide processing e~lipment having a xenon light for fixing the image, the protective transparent sheet would be eliminated.
Various alternative configurations will, from the present disclosure, suggest themselves to those skilled in the art. For example, the card stock may be coated with ad-hesive on both sides thereof for the bonding of protective film 132 and conductive member 135 to the frame panels.
Furthermore, the release paper disposed over that portion of the card stock containing windows 49 may be unpunched so as to protect film 132 during processing of the transparency. For enhanced grounding capability the release paper may be pro-vided with a conductive portion adapted to connect with con-ductive means 235.
Individual slide frames 10 are provided by simply cutting the completed multi-ply unitary strip of Fi~. 4 into separate lengths whereby open slide frames, as shown in Fig.
1, are produced. Alternatively, should the mass processing of a multiplicity of slides be requiredl a multiplicity of such slides may be processed in roll form prior to the sep-aration of the individual slides 10 from one another.
In using the slide frames of the type shown in Fig. 1, the slide may be simply inserted in its open condition film side down in a slide processing apparatus. The film is charged by the corona charging head as it enters the unit and ~S~38V
is then imaged by exposure to an imaging light source within the unit~ After imaging, the film is toned as the slide is retracted from the unit and may ~e permanently fixed by exposure to a ~enon light source. On withdrawal from the apparatus, release paper 45 is simply peeled off the inner surface of the frame panel 20 and the two panels are folded together and adhesively bonded by the adhesive 40. This forms a completed fully mounted slide, as shown in Fig. 5, which is ready for projection in a 35 mm pro-jector.
Another film such as a diazo or silver halidefilm may be similarly mounted on the same type of slide frame and used for duplicating the image from the elec-tro~hotographic filmO For this purpose, the slide mounted electrophotographic film is used as a master which can be duplicated on another film also mounted on a foldable slide frame. The frames provide a registration system for holding the two films in surface-to-surface contact.
After imaging the second slide may be folded and projected in any conventional manner.
. . . . , .. . . . , ~ . . .
': ~ : . . . :
:; . . ' . . ' .. ' . ' ': ' :
. ~
The use of slide transparencies has in recent years become increasingly popular, particularly in the field of visual communications. Those involve~ in the dissemination of ideas for such purposes as educational courses and business, professional and governmental semi-nars are continually seeking new ways to present infor-mation visually. One of the most convenient and readily available techniques for such presentation involves the use of standard 35 mm slide transparencies. For maximum utilization of such slide transparencies a simple and convenient method must be available for reproducing variou~
printed materials as projectable images on slide transparen-cies.
While silver halide and diazo film have been used in making such slide transparencies, the imaging and de-veloping processes for such film are generally time con-suming and require trained operators. On the other hand, electrophotography while capable of producing e~cellent high resolution images in a convenient and economical manner, lacks effective methods and means for utilizing electrophotographic film in slide transparencies projec-table in 35 mm projectors.
The only commercially available electrophotogra-phic slide processing system employs fully mounted sllde frames. These frames consist of a film laminated between two window apertured paperboard frames, the plane of the film being recessed inwardly of the outer surface of the frames. A hole is provided through one of the frames for 38~
contact with the photoconductive layer of the film~ In the use of these slides some imaging deficiencies have been encountered, particularly along the outer edges of the film adjacent the window edge of the frame. It is believed this difficulty results from the surface tension of the liquid toner which is applied at the toning head of the slide processor system. Inasmuch as the outer surfaces of the frame and filrn are not coplanar, there is a ten-dency due to surface tension for the toner to bridge areas of the film adjacent the edges of the frame. At-tempts to alleviate this problem have involved the use of paperboard frames sufficiently absorbent to wick up the toner liquid so that the full imaging potential of the film area is utilized. Unfortunately~ the frames remain wet or damp as they emerge from the processor ~nit and tend to warp on drying. As a consequence, it has been the prac-tice to make these frames considerably thicker than the standard 35 mm photographic slide used in the most commer-cially popular slide projectors, thereby mandating the use of less popular slide projectors or projectors espe-cially adapted for use with these particular slide frames.
Furthermore, this non-coplanar configuration of such prior art slides renders it inconvenien-t if not im-possible to place such slides in surface-to-surface contact with other photographic films such as silver halide or diazo films. Such surface-to-surface contact is desira-ble for exarnple in the reproduction of an electrophoto-graphic filrn image onto another type of film or in the superpositioning and simultaneous projection of an elec-trophotographic film image and a second background image.
~s~
It is the principal object of this invention to provide slide transpareneies eonstrueted for use in an eleetrophotographic slide processor which overcome the drawbaeks of eommereially available slide transparencies.
Another object of this invention is to provide slide transparencies of open frame construction wherein the electrophotographic film provides a wholly planar surface for imaging and toning.
It is a further objeet of this invention to provide slide transparencies of the above type wherein the planar proeessing surface is provided with a fully exposed electrieally eonduetive layer.
Yet another object of this invention is to pro-vide a slide transpareney frame construetion whieh lends itself to efficient and economical manufacturing proeedu-res, each of use in a slide proeessor unit and after pro-eessing is readily converted to a fully mounted slide frame for projection in standard 35 mm slide projectors.
A further object of the present invention is to provide such a slide transpareney whieh ean be assembled without heat sealing.
It is another objeet of the present invention to provide a slide transpareney of the above type wherein the transpareney image may be eonveniently eontact du-plieated onto another photographie film sueh as a diazo or silver halide eolor film.
~ . .
It is yet a further object to provide a slide transparency in which images on a pair oE ~ilm surfaces are disposed in superposed registration with one another for simultaneous projection of a composite image.
In accordance with a particular embodiment of the invention there is provided a slide transparency for electrophotographic film which includes an electrically conductive layer comprising a generally planar frame including a pair of panels defined by a hinge therebetween.
Each panel lies in generally the same plane before folcl-ing and each has a window shape projection aperture therethrough registrable when the panels are folded together about the hinge. The ~irst of these panels has an electrographic film disposed thereon spanning the window aperture therein, while the inner surface of the - second panel has an adhesive thereon ~or bonding the two panels together in superposed relation when ~olded about the hinge. An electrically conductiva strip is disposed on the film for grounding the electrically conductive layer of the film when imaging the film before the frame is ~olded.
From a difEerent aspect, an embodiment o~ the invention comprises a me~hod of fabricating slide trans-parencies for electrophotographic film. The method includes the steps o~ cutting and scoring an elongated strip o~ sheet material with two laterally spaced rows oE
rectangular apertures. m e apertures in each row are disposed on opposite sides of a fold line extending from end to end of the strip. The apertures in each row are longitudinally spaced and disposed to register with the apertures oE the other row. The method further includes the steps of laminating the length o~ the electrophotographic film onto the strip in spanning relation to one o~ the rows of apertures. The ~ilm has a grounding strip of electricall~ conductive m~terial carried along the edge of the film. The method still -4a-further includes the step of transversely sever:ing the unitary strip between adjacent apertures of rows whereby a plurality of individual slide transparencies are obtained.
mese and other objects will become more readily apparent from the following detailed description taken in connection with the accompanying drawings wherein:
Fig, 1 is a perspective view of an electro-photographic slide frame transparency of open, foldable construction embodying this invention, Fig. 2 is a sectional view on an enlarged scale taken along line ~-2 of Fig. 1, Fig~ 3 is a partial elevational view of a modified form of the slide transparency of the present invention' Fib. 4 is a plan view of continuous strip of slide frame transparencies of the type embodying this invention, and Fig. 5 is a perspective view of a fully mounted slide transparency.
Re~erring to the drawings and particularly to Figs. 1-3, an electrophotographic film transparency of open, foldable construction is shown generally at 10 and comprises a pair of relatively rigid panels 15 and 20 having window apertures. The panels are foldable along fold or score line 25 to foxm a slide mount. A strip of electrophotographic film 30 is laminated in , 3~
edge-to-edge relati3n on the inner surface of the panel 15.
A conductive str;p 35 is bonded onto f~lm 30 in contact with the photoconductive layer of the film. The inner surface of panel 20 is coated with a pressure sensitive adhesive 40 ~Fig. 2), which is covered by release paper 45 and in the embodiment shown a transparent cover sheet 32 such as acetate or polyester is carried on the outer surface of panel 20 to protect unfixed images on the film 30 when the panels are folded together. The protective film 32 renders unnecessary the fixa-tion of image as by use of a xenon flash. A photographic film transpareney 33 may be disposed in the inner surface of panel Z0 so that its image side will contact the image side of film 30 when the frame panels are folded together. Film transparency 33 may be any suitable type of fi~m imaged for composite projection with the image on the film 30.
For imaging of the electrophotographi c film as describèd in my copending Application Serial No. 938, 695 for "Electrophotographic Apparatus", filed-August 31, 1978, now US Patent No. 4202~19 issued May 13, 1980, the photoconductive layer of the film 30 is charged as by a corona, imaged by a light source and then toned as with a toner comprising a liquid carrying suspension of toner particles of carbon black or the like. The toned image may then be "fixed" as with a xenon flash. After imaging a slide transparency mount is formed by removal of the release paper and the folding together of the tw~ p~nels so that the film is permanently laminated between the frame panels as shown in Fig. 5.
Panel~ 15 and 20 are formed from a relatively rigid material such as paperboard, synthetic plastic or the like with a fold or hinge 11ne 25 disposed midway between the outer ends ,, of the panels so that when folded together the panels will register in superposed edye-to-edge relation to form a fully mounted slide7 preferably of standard (35 mm) size.
Each panel includes a window ~8 and ~9 which are adapted to coincide when the panels are folded together. As best seen in Fig. 1, the dimensions of window 4~, such that when the frame members are folded together, the ed~es of window 48 lie within and parallel to the e~ges of window 49.
This coaxial window arrangement insures full unimpeded projection of images on the film 30, particularly those portions adjacent the edges of the window ~8 should the windows become somehow misaligned.
As be~t shown in Fig. 2, the inner surface of the frame panels is coated with pressure sensitive ad-hesive 40 which on panel 20 is protected by release strip45. In the preferred embodiment film 30 is generally co-extensive with edges of panel lS and is laminated onto the inner surface thereof by the adhesive 40. The inner edge of the film is spaced slightly from hinge line 25 so as not to interfere with the folding of the frame panels.
The film 30 and release paper meet along a line 41 adjacent hinge 25 on panel 15~ The upper surfaces of the film and paper are generally coplanar, thus providing a smooth uniform surface which facilitates handling and imaging of the film in a slide processor system.
Conductive strip 35 or other suitable conductive means is disposed along the outer edge of the film 30 opposite hinge line 25. I'he conductive strip may be any electrically conductive material such as a metallic foil which is bonded by an electrically conductive adhesive onto the film and in contact with the electrically conductive layer of the film 30 shown on an , enlarged scale at 55 in Fig. 3. The film illus-trated also ineludes a base layer 50 and photoeonducting layer 60.
The foil 35 enables grounding during imaging of the layer 55 to the frame of the processing equipment. This is aecomplished by scribing the upper surface of strip 35, preferably aluminum foil, sufficiently to cause portions of the foil to penetrate the upper film layer and contact the e~nduetive layer 5~. During fabrication of the side frames, the foil is seribed by a mechanism which depresses a plurality of laterally spaced seribe marks 63, as best illustrated in Figs. 1 and 3. This eonstruetion insures grounding of the eleetrieally eonduetive layer 55 during eorona charging of the photoeonduetive layer 60.
An alternate embodiment of the grounding strip 35 is shown at 135 in Fig. 3. The strip 135 may be a me-tallic foil whieh is folded over the outer edge portion frame panel 15 and may be scribed as at 63 for contact with the electrieally eonductive layer 55 of the film 30 in the same manner as foil 35. This eons-truetion while requiring the use of greater quantities of metal foil may be advantageous for firmly bonding the grounding strip to the edge of the slide frame.
Film 33 as discussed above may be an imaged pho-tographic film sueh as a diazo, silver halide or a seeond strip of eleetrophotographie film sueh that when panels 15 and 20 are folded together, films 30 and 33 are dis-posed in surfaee-to-surfaee contaet with one another for eomposite projeetion. Film 33 may be a diazo eolor film and after development remain as part of the transparency as a baekground image simulataneously projectable with the image on the photoeonductive film.
~5~3BO
The structural characteristics of slides embodying this invention are such that the slides may be fabricated by mass production techniques. As illustrated in Fig. 49 a continuous strip or web 75 of fiberboard material is coated with a suitable pressure sensitive adhesive 40 which in turn is covered with a suitable release paper. The transparency frame is then punched and creased to form a plurality of spaced windows 48 and 49 on opposite sides of fold line 25. The release paper overlying the strip in which windows 48 have been cut is then removed and a strip of electrophotographic film is mounted on the exposed pressure sensitive adhesive. In the preferred embodiment, film strip 130 to which conductive strip 235 has been previously bonded is then mounted onto the card stock. The conductive foil strip is bonded onto the edge of the film strip using an electrically conductive adhesive and by a scribing technique the foil is made to penetrate the film and contact the conductive layer.
The inner edges of the film strip 130 and the release strip 145 abut along line 41 spaced ~ om hinge line 25 toward windows 48. The outer surface of the strip 75 may be laminated with a trans-parent protecti~7e strip 132. Strip 132 is only appLied on side-frames fabricated for use in a slide processor in which the image will remain "unfixed", thus being subject to smudging or : - . .
' . . . ~ - . - .
::
eradication with careless handlingn For slides adapted to be used in slide processing e~lipment having a xenon light for fixing the image, the protective transparent sheet would be eliminated.
Various alternative configurations will, from the present disclosure, suggest themselves to those skilled in the art. For example, the card stock may be coated with ad-hesive on both sides thereof for the bonding of protective film 132 and conductive member 135 to the frame panels.
Furthermore, the release paper disposed over that portion of the card stock containing windows 49 may be unpunched so as to protect film 132 during processing of the transparency. For enhanced grounding capability the release paper may be pro-vided with a conductive portion adapted to connect with con-ductive means 235.
Individual slide frames 10 are provided by simply cutting the completed multi-ply unitary strip of Fi~. 4 into separate lengths whereby open slide frames, as shown in Fig.
1, are produced. Alternatively, should the mass processing of a multiplicity of slides be requiredl a multiplicity of such slides may be processed in roll form prior to the sep-aration of the individual slides 10 from one another.
In using the slide frames of the type shown in Fig. 1, the slide may be simply inserted in its open condition film side down in a slide processing apparatus. The film is charged by the corona charging head as it enters the unit and ~S~38V
is then imaged by exposure to an imaging light source within the unit~ After imaging, the film is toned as the slide is retracted from the unit and may ~e permanently fixed by exposure to a ~enon light source. On withdrawal from the apparatus, release paper 45 is simply peeled off the inner surface of the frame panel 20 and the two panels are folded together and adhesively bonded by the adhesive 40. This forms a completed fully mounted slide, as shown in Fig. 5, which is ready for projection in a 35 mm pro-jector.
Another film such as a diazo or silver halidefilm may be similarly mounted on the same type of slide frame and used for duplicating the image from the elec-tro~hotographic filmO For this purpose, the slide mounted electrophotographic film is used as a master which can be duplicated on another film also mounted on a foldable slide frame. The frames provide a registration system for holding the two films in surface-to-surface contact.
After imaging the second slide may be folded and projected in any conventional manner.
. . . . , .. . . . , ~ . . .
': ~ : . . . :
:; . . ' . . ' .. ' . ' ': ' :
. ~
Claims (15)
1. Slide transparency for electrophotographic film which includes an electrically conductive layer comprising a generally planar frame including a pair of panels defined by a hinge therebetween and each lying in generally the same plane before folding and each having a window shaped projection aperture therethrough registrable when the panels are folded together about said hinge, the first of said panels having an electrophotographic film disposed thereon spanning the window aperture therein, the inner surface of the second panel having an adhesive thereon for bonding the two panels together in superposed relation when folded about said hinge, and an electric-ally conductive strip disposed on said film for grounding said electrically conductive layer of the film when imaging said film before said frame is folded.
2. Slide transparency for electrophotographic film as set forth in Claim 1 wherein said film is disposed on the inner surface of said first panel and said adhesive is a pressure sensitive adhesive disposed on the second panel, a release material removably covering said adhesive and peelable therefrom for binding the two panels together.
3. Slide transparency for electrophotographic film as set forth in Claim 2 in which said electrically conductive material is a metallic foil disposed on the surface of said electrophotographic film.
4. Slide transparency for electrophotographic film as set forth in Claim 3 wherein said foil is scribed to cause por-tions thereof to be deformed into electrical contact with said electrically conductive layer.
5. Slide transparency for electrophotographic film as set forth in Claim 3 wherein said release material and film are generally coplanar.
6. Slide transparency for an electrophotographic film as set forth in Claim 5 wherein said film is generally coextensive with said first frame panel and terminates in contiguous relation with said release material along a line on said first panel spaced from said hinge whereby the release material spans the hinge area of said slide transparency.
7. Slide transparency for an electrophotographic film as set forth in Claim 5 wherein the opening in said second panel is covered with a transparent material for protecting an unfixed image on said electrophotographic film when said frame panels are folded and bonded together.
8. Slide transparency for electrophotographic film as set forth in Claim 5 wherein the dimensions of the apertures in said second panel are greater than the corresponding dimen-sions of the apertures of the first panel so that light trans-mitted through said second panel will project over the entire image imprinted on said film despite some misalignment of the two panels when bonded together.
9. Slide transparency for electrophotographic film as set forth in Claim 1 and further including a photographic film disposed on the second of said panels, spanning the window therein, such that said photographic film and said electrophoto-graphlc film are disposed in surface-to-surface aligned contact when said two panels are bonded together.
10. Slide transparency for electrophotographic film as set forth in Claim 9 wherein said photographic film is a pre-imaged color transparency projectable with said electro-photographic film to produce a composite color image.
11. Method of fabricating slide transparencies for electrophotographic film comprising the steps of cutting and scoring an elongated strip of sheet material with two laterally spaced rows of rectangular apertures, the apertures in each row being disposed on opposite sides of a fold line extending from end-to-end of said strip, the apertures in each row being longitudinally spaced and disposed to register with the apertures of the other row:
laminating the length of the electrophotographic film onto said strip in spanning relation to one of said rows of apertures, said film having a grounding strip of electrically conductive material carried along an edge of said film; and transversely severing the unitary strip between adjacent apertures of rows whereby a plurality of individual slide trans-parencies are obtained.
laminating the length of the electrophotographic film onto said strip in spanning relation to one of said rows of apertures, said film having a grounding strip of electrically conductive material carried along an edge of said film; and transversely severing the unitary strip between adjacent apertures of rows whereby a plurality of individual slide trans-parencies are obtained.
12. Method of fabricating slide transparencies for electrophotographic film as set forth in Claim 11, including the steps of coating one surface of said unitary strip with a pressure sensitive adhesive and thereafter applying a release material onto a portion of said adhesive and bonding said length of electro-photographic film to said strip by that portion of said adhesive not covered by said release material, said film and release paper being generally coplanar and having their adjacent edges in contiguous relation on the film side of said hinge line and apply-ing a second film over the apertures on the side of said strip opposite said electrophotographic film.
13. Method of fabricating slide transparencies for electrophotographic film as set forth in Claim 12 wherein said second film is an imaged color transparency.
14. Method of fabricating slide transparencies of electrophotographic film as set forth in Claim 12 wherein said film is a clear transparent material for protecting unfixed images on said electrophotographic film.
15. Method of fabricating slide transparencies of electrophotographic film as set forth in Claim 12 wherein said film is an unexposed diazo film upon which images on said electrophotographic film can be reproduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000370221A CA1145980A (en) | 1981-02-05 | 1981-02-05 | Electrophotographic slide and method of making same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000370221A CA1145980A (en) | 1981-02-05 | 1981-02-05 | Electrophotographic slide and method of making same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1145980A true CA1145980A (en) | 1983-05-10 |
Family
ID=4119096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000370221A Expired CA1145980A (en) | 1981-02-05 | 1981-02-05 | Electrophotographic slide and method of making same |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1145980A (en) |
-
1981
- 1981-02-05 CA CA000370221A patent/CA1145980A/en not_active Expired
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