CA1044081A - Electrostatic duplicating method and apparatus utilizing wet developing - Google Patents
Electrostatic duplicating method and apparatus utilizing wet developingInfo
- Publication number
- CA1044081A CA1044081A CA208,641A CA208641A CA1044081A CA 1044081 A CA1044081 A CA 1044081A CA 208641 A CA208641 A CA 208641A CA 1044081 A CA1044081 A CA 1044081A
- Authority
- CA
- Canada
- Prior art keywords
- ink
- supply member
- electroconductive
- latent image
- elastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Wet Developing In Electrophotography (AREA)
Abstract
ABSTRACT
Apparatus for wet-developing an electrostatic latent image comprising an electroconductive, ink supply member having an uneven surface comprising a plurality of raised portion and depressions below the raised portion, at least the surface of the ink supply member being electroconductive; means for supplying ink to the ink supply member so that the ink is held in the depressions; an electrophotographic member bearing the electrostatic latent image; and elastic, electroconductive support member for the electrophotographic member; and means for bringing the ink supply member and electrophotographic member into substantial contact with one another so that the ink is attracted to the electrostatic latent image to thereby develop the image while minimizing damage to the electrophotographic member because of the elasticity of said elastic support member.
Apparatus for wet-developing an electrostatic latent image comprising an electroconductive, ink supply member having an uneven surface comprising a plurality of raised portion and depressions below the raised portion, at least the surface of the ink supply member being electroconductive; means for supplying ink to the ink supply member so that the ink is held in the depressions; an electrophotographic member bearing the electrostatic latent image; and elastic, electroconductive support member for the electrophotographic member; and means for bringing the ink supply member and electrophotographic member into substantial contact with one another so that the ink is attracted to the electrostatic latent image to thereby develop the image while minimizing damage to the electrophotographic member because of the elasticity of said elastic support member.
Description
~ ~ ~Q~
BACKGROUND OF THE INVENTION
(1) Field Of The Invention The present invention relates to an electrostatic .
duplicating process and apparatus and, in particular, to the improved development of electrostatic latent images in such processes and apparatus. --The term "electrostatic duplicating process"
as used herein this specification includes all duplicating processes which include the formation of an electrostatic latent image. For example, there would be included electro- ~~photographic duplicating processes where an electrostatic latent image is formed by electrifying the surface of a photoconductor and subjecting it to imagewise exposure;
electrostatic recording processes where an electrostatic latent image is formed by scanning the surface of a .
dielectric with a needle electrode; duplicating processes where an electrostatic latent image is formed by imagewise exposing a photoconductor while applying thereto a by-pass electric potential and the like.
BACKGROUND OF THE INVENTION
(1) Field Of The Invention The present invention relates to an electrostatic .
duplicating process and apparatus and, in particular, to the improved development of electrostatic latent images in such processes and apparatus. --The term "electrostatic duplicating process"
as used herein this specification includes all duplicating processes which include the formation of an electrostatic latent image. For example, there would be included electro- ~~photographic duplicating processes where an electrostatic latent image is formed by electrifying the surface of a photoconductor and subjecting it to imagewise exposure;
electrostatic recording processes where an electrostatic latent image is formed by scanning the surface of a .
dielectric with a needle electrode; duplicating processes where an electrostatic latent image is formed by imagewise exposing a photoconductor while applying thereto a by-pass electric potential and the like.
(2) Descr~iption Of The Prior Art Heretofore, electrostatic latent images on a photoconductive member have been developed with ink-supplying members having a fine, uneven peripheral portion such as disclosed in United States Patent No. 3,084, 043. In such ~' processes, liquid ink is held in the depressions formed on the `:
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ink-supplying member, and the raised portions thereof are positioned against or close to the surface of the electro- , static latent image-bearing photoconductive member, whereby the ink in the depressions is transferred via the raised portions to the surface bearing the electrostatic latent -image by the electrostatic attracting force of the electro-static charge on the photoconductive member to develop the latent image. The ink-supplying member may be prepared by forming slots or grooves, for example, on the surface of a ,~
hard, electroconductive substance such as an iron pipe or by forming hardened resin dot patterns on a metal plate. Since the ink-supplying member is in physical contact with the -~
photoconductive member or can contact it if positioned close thereto, the surface of the photoconductive member is subject to damage, which in turn results in image ~uality deteriora-tion. ;A . ~ ' SUMMARY OF THE INVEN~ION
In accordance with one aspect of this inventlon there is provided apparatus for wet-developing an electrostatic latent image comprising an electroconductive ink-supply `
member having an uneven surface comprising a plurality of raised portions and depressions below said raised portions, at least the surface of said ink-supply member being electro- ~`
conductive; means for supplying ink to said ink-supply member so that the ink is held in said depressions; an electrophoto-graphic member bearing said electrostatic latent image; an elastic, electroconductive support member for said electro-photographic member, the support member having a resistivity no greater than 1~1 ohm. cm; and means for bringing the ink-supply membe-r~and the electrophotographic member into ~, ~3~8~
,:. ' substantial contact with one another so that said ink is attracted to said electrostatic latent image to thereby develop the image while minimizing damage to the electro-photographic member because of the elasticity of said elastic support member.
In accordance with another aspect of this invention there is provided a method of wet-developing an electro-static latent image comprising selecting an electroconductive, ink-supply member having an uneven surface comprising a plurality of raised portions and depressions below said raised portions, at least the surface of said ink-supply member being electroconductive; supplying ink to said ink-supply member so that the ink is held in said depressions; selecting an electrophotographic member bearing said electrostatic latent - image; selecting an elastic, electroconductive support member for said electrophotographic member, the support membe~ having a resistivity no greater than 101 ohm. cm; and bringing the ink-supply member and the electrophotographic member into substantial contact with one another so that said ink is attracted to said electrostatic latent image to thereby develop ,~
the image while minimizing damage to the electrophotographic member because of the elasticity of said elastic support member.
BRIEF DESCRIPTION OF THE DR~WING
Figure 1 is a diagrammatic view of an ink-supplying member applying ink to an illustrative embodiment of an electrophotographic member in accordance with this invention.
Figure 2 is a diagrammatic view of an electrophoto-graphic apparatus utilizing the wet-developing process of -this invention.
~ ' ,`',' :
8~ ;
`DETAI'-LED DES'~RIPTI'ON :~F PREFE~ EMBO'DIMENTS ,' '`
OF INVENTI`ON ,,.,:
Referring to Figures 1 and 2, various illustra- . -tive embodiments of the invention will now be described.
An ink-supply member 10 is provided which may be inelastic (as shown in Figure 1) or elastic and have a fine, uneven surface. Thus, ink-supply member 10 may comprise an elastomer having electroconductivity at least at the surface thereof. A liquid ink 12 is supplied to the ink-supply member 10 by ink-supplying means (typically com prising ink container 14 and inking roller 16) to the depressions or valleys 18 formed on the ink-supplying 'r': ` ' member. The raised portions of the ink-supplying member are brought into contact with the electrostatic latent image-bearing surface a light-sensitive member, which ~`
comprises a light-sensitive layer 22 on the surface of an electroconductive elastic support 24, which may be grounded. ~;
The liquid ink thus held in the depressions 18 is supplied to the latent image-bearing surface via the raised portions of the ink-supply member 10 by the electrostatic attracting action of the electrostatic charge on the light-sensitive layer 22. A thin metallic layer 26 may be provided between the electroconductive, elastic support 24 and the light-sensitive layer 22. Since the latent image-forming surface of the light-sensitive member is supported by an elastomer, there is little, if any, probability of the surface of the light-sensitive layer 22 being damaged upon contact with the ink-supply member 10. Thus, the durability of the light-sensitive layer 22 is greatly enhanced and, in addition, the '~?,:`
distinctness of the resulting image is markedly improved.
The resistivity of the electroconductive elastic support 24 should be no greater than 101ohm.cm and preferably no ` ' .
:, .. -.. . ` ,. ., - ; , . .. , . . .. ". ., ., . . . . . :
greater than lOfi oh~.cm and the thickness should be sufficient to provide elasticity and should be at least 1 mm.
Several illustrative examples of the invention will now be described, there being no intent to limit the scope thereof. -Rxample 1 Silcone rubber having a Shore hardness of 75 and electric resistivity of 1 x 103 ohm.cm was utilized as support member 24 and wound around an aluminum pipe of 200 mm. outside diameter and 300 mm. width in thickness of 10 mm. A photoconductive substance of cadmium sulfide was utilized as the light-sensitive layer 22 and coated the pipe to a thickness of 40~to prepare a light-sensitive mem-ber. An electrostatic latent image 20 was formed thereon in a conventional manner such as by uniform charging means 28 and image e~posing means 30 of Figure 2. Separate slots of 0.1 mm. in pitch and 0.1 mm. in depth were formed on the surface of an iron pipe of 40 mm. outside diameter to thereby provide an ink-supply member 10. Liquid ink was supplied to the slots formed on the ink-supply member.
After removing excess ink by a doctor blade 32, the ink-supply member 10 was brought into substantial contact with the sur-face of light-sensitive member 22 to effect development.
In this instance, it is not necessary to mechanically bring the two members into contact with each other, but it is , sufficient to position them close enough to each other for the liquid ink to move from one to the other. Thus, even in the foregoing instance, the ink-supply member and the light-sensitive member can be considered to be in "sub-stantial contact" with one another for the purpose of this `~
specification and claims. Even when the members are not ;~
in physical contact, there is a high probability that the ink-supply member and the light-sensitive member will physi-cally contact each other and thus damage the light-sensitive mem~er. However, since an elastic support member 24 is provided for the light-sensitive member 22, no damage of the light sensitive member is observed and images of high quality are formed on the photoconductive surface.
The ink-supply member lO may be replaced by one which is prepared by winding an elastomer, which has electro-conductivity at least at the surface layer, around an iron pipe and having a fine uneven portion over the entire surface on the elastomer. In this case, both the light-sensitive member and the ink-supplying member possess elasticity and damage to the light-sensitive member can be further reduced.
Example 2 Silicone rubber having a Shore hardness of 75 and a resistivity of 1 x 103 ohm.cm was wound around an aluminum pipe of 200 mm. outside diameter and 300 mm. width in a thickness of 10 mm. Nickel (corresponding to layer 26) was plated thereon in a thickness f 5h~ and selenium was further vacuum deposited thereon in a thick- `
ness of 80~to prepare the light-sensitive member on which an electrostatic latent image was formed in a conventional manner. Thereafter, liquid ink was supplied to the ink slots formed on the ink-supplying member made of iron pipe des-cribed in Example 1, and this ink-supplying member was brought into contact with the surface of the above-described light-sensitive member. There was obtained a good ;~
image on the photoconductive surface without damaging the selenium layer on the surface of the light-sensitive member.
Example 3 Silicone rubber having a Shore hardness of 75 3i~
and electric reisitivity of 1 x 10 ohn.cm was wound around an aluminum pipe of 200 mm. outside diameter and 300 mm. ~' width in a thickness of 10 mm. Nickel was ~lated thereon in a thickness of 5~ and a photoconductive surface of cadmium sulfide was further coated thereon in a thickness of 40~to prepare the light-sensitive member on which an electrostatic latent image was formed in a usual manner. Thereafter, liquid ink was supplied to the slots formed on the ink-supply member made of iron pipe described in Example 1, and this ink-supply member was brought into contact with the surface of the above-described light-sensitive member.
There was obtained a more distinct image than in Example 1 without damaging the surface of the light-sensitive member of cadmium sulfide.
Example 4 Urethane'rubber having a Shbre hardness o 75 -`
and electric resistivity of 1 x 103 ohm.cm was used instead of the silicone rubber used in Example 1, and a photoconduc- ~
tive substance of cadmium sulfide was coated thereon in ~^
a thickness of 40~ to prepare the light-sensitive member, to which liquid ink was applied by the same ink-supplying member as described in Example 1. There was obtained the same image quality as in Example 1 with no damage to the photoconductive layer.
In all of the above-described Examples, image quality can be stabilized by electrically grounding the ink-supply member 10, and further a more improved image -can be obtained by pressing, upon transferring at station ~ ' 34, the transfer paper by a rubber roller 36. The above operations can then be repeated at cleaning station 38. ' The liquid ink used in each of the foregoing '~
examples typically has a volume resistance of 1 x 105 to '~
';', ' ' ,. ~.
"
1 x 10 ohm.cm and a viscosity of from aibout lon ~ps. to . .
about 10,000 cps. and comprises a single phase. Examples of , thie composition are as follows: ..
(A) Polypropylene glycol (molecular ;. :-weight: 1025) 60% by weight ~:~
Microlith* CT Black (predespersed .: .
carbon black, made by Ciba :-.
Limited) . 25% by weight ~
RucofleX* TG-8 (triethylene : :.
glycol aicaprilate, made by . ~ :.
Hooker Chemical Co.)15~ by weight .~
(B) Light liquid ~araffin45% hy weighit :.
Microlith* CT Black (same as . ,:
in (A)) 25% by weight ~ ~ :
Ganex* V-216 (alkylated ,~:
polyvinylpyrrolidone, made by.C-eneral.Anyline25% by weight Solid paraffin 5~ by weight Numerous modifications of the invention will become apparent to one of ordinary skill in the art upon .. :
reading the foregoing disclosure. During such a reading .
it will be evident that this invention provides a unique apparatus and method utilizing wet-developing for accomplish- ~.
ing the objects and advantages hereinstated.
*trade marks ' :
- . ' ;, :., .. . . . . ..
~k ~
-2- ~
,~, .
ink-supplying member, and the raised portions thereof are positioned against or close to the surface of the electro- , static latent image-bearing photoconductive member, whereby the ink in the depressions is transferred via the raised portions to the surface bearing the electrostatic latent -image by the electrostatic attracting force of the electro-static charge on the photoconductive member to develop the latent image. The ink-supplying member may be prepared by forming slots or grooves, for example, on the surface of a ,~
hard, electroconductive substance such as an iron pipe or by forming hardened resin dot patterns on a metal plate. Since the ink-supplying member is in physical contact with the -~
photoconductive member or can contact it if positioned close thereto, the surface of the photoconductive member is subject to damage, which in turn results in image ~uality deteriora-tion. ;A . ~ ' SUMMARY OF THE INVEN~ION
In accordance with one aspect of this inventlon there is provided apparatus for wet-developing an electrostatic latent image comprising an electroconductive ink-supply `
member having an uneven surface comprising a plurality of raised portions and depressions below said raised portions, at least the surface of said ink-supply member being electro- ~`
conductive; means for supplying ink to said ink-supply member so that the ink is held in said depressions; an electrophoto-graphic member bearing said electrostatic latent image; an elastic, electroconductive support member for said electro-photographic member, the support member having a resistivity no greater than 1~1 ohm. cm; and means for bringing the ink-supply membe-r~and the electrophotographic member into ~, ~3~8~
,:. ' substantial contact with one another so that said ink is attracted to said electrostatic latent image to thereby develop the image while minimizing damage to the electro-photographic member because of the elasticity of said elastic support member.
In accordance with another aspect of this invention there is provided a method of wet-developing an electro-static latent image comprising selecting an electroconductive, ink-supply member having an uneven surface comprising a plurality of raised portions and depressions below said raised portions, at least the surface of said ink-supply member being electroconductive; supplying ink to said ink-supply member so that the ink is held in said depressions; selecting an electrophotographic member bearing said electrostatic latent - image; selecting an elastic, electroconductive support member for said electrophotographic member, the support membe~ having a resistivity no greater than 101 ohm. cm; and bringing the ink-supply member and the electrophotographic member into substantial contact with one another so that said ink is attracted to said electrostatic latent image to thereby develop ,~
the image while minimizing damage to the electrophotographic member because of the elasticity of said elastic support member.
BRIEF DESCRIPTION OF THE DR~WING
Figure 1 is a diagrammatic view of an ink-supplying member applying ink to an illustrative embodiment of an electrophotographic member in accordance with this invention.
Figure 2 is a diagrammatic view of an electrophoto-graphic apparatus utilizing the wet-developing process of -this invention.
~ ' ,`',' :
8~ ;
`DETAI'-LED DES'~RIPTI'ON :~F PREFE~ EMBO'DIMENTS ,' '`
OF INVENTI`ON ,,.,:
Referring to Figures 1 and 2, various illustra- . -tive embodiments of the invention will now be described.
An ink-supply member 10 is provided which may be inelastic (as shown in Figure 1) or elastic and have a fine, uneven surface. Thus, ink-supply member 10 may comprise an elastomer having electroconductivity at least at the surface thereof. A liquid ink 12 is supplied to the ink-supply member 10 by ink-supplying means (typically com prising ink container 14 and inking roller 16) to the depressions or valleys 18 formed on the ink-supplying 'r': ` ' member. The raised portions of the ink-supplying member are brought into contact with the electrostatic latent image-bearing surface a light-sensitive member, which ~`
comprises a light-sensitive layer 22 on the surface of an electroconductive elastic support 24, which may be grounded. ~;
The liquid ink thus held in the depressions 18 is supplied to the latent image-bearing surface via the raised portions of the ink-supply member 10 by the electrostatic attracting action of the electrostatic charge on the light-sensitive layer 22. A thin metallic layer 26 may be provided between the electroconductive, elastic support 24 and the light-sensitive layer 22. Since the latent image-forming surface of the light-sensitive member is supported by an elastomer, there is little, if any, probability of the surface of the light-sensitive layer 22 being damaged upon contact with the ink-supply member 10. Thus, the durability of the light-sensitive layer 22 is greatly enhanced and, in addition, the '~?,:`
distinctness of the resulting image is markedly improved.
The resistivity of the electroconductive elastic support 24 should be no greater than 101ohm.cm and preferably no ` ' .
:, .. -.. . ` ,. ., - ; , . .. , . . .. ". ., ., . . . . . :
greater than lOfi oh~.cm and the thickness should be sufficient to provide elasticity and should be at least 1 mm.
Several illustrative examples of the invention will now be described, there being no intent to limit the scope thereof. -Rxample 1 Silcone rubber having a Shore hardness of 75 and electric resistivity of 1 x 103 ohm.cm was utilized as support member 24 and wound around an aluminum pipe of 200 mm. outside diameter and 300 mm. width in thickness of 10 mm. A photoconductive substance of cadmium sulfide was utilized as the light-sensitive layer 22 and coated the pipe to a thickness of 40~to prepare a light-sensitive mem-ber. An electrostatic latent image 20 was formed thereon in a conventional manner such as by uniform charging means 28 and image e~posing means 30 of Figure 2. Separate slots of 0.1 mm. in pitch and 0.1 mm. in depth were formed on the surface of an iron pipe of 40 mm. outside diameter to thereby provide an ink-supply member 10. Liquid ink was supplied to the slots formed on the ink-supply member.
After removing excess ink by a doctor blade 32, the ink-supply member 10 was brought into substantial contact with the sur-face of light-sensitive member 22 to effect development.
In this instance, it is not necessary to mechanically bring the two members into contact with each other, but it is , sufficient to position them close enough to each other for the liquid ink to move from one to the other. Thus, even in the foregoing instance, the ink-supply member and the light-sensitive member can be considered to be in "sub-stantial contact" with one another for the purpose of this `~
specification and claims. Even when the members are not ;~
in physical contact, there is a high probability that the ink-supply member and the light-sensitive member will physi-cally contact each other and thus damage the light-sensitive mem~er. However, since an elastic support member 24 is provided for the light-sensitive member 22, no damage of the light sensitive member is observed and images of high quality are formed on the photoconductive surface.
The ink-supply member lO may be replaced by one which is prepared by winding an elastomer, which has electro-conductivity at least at the surface layer, around an iron pipe and having a fine uneven portion over the entire surface on the elastomer. In this case, both the light-sensitive member and the ink-supplying member possess elasticity and damage to the light-sensitive member can be further reduced.
Example 2 Silicone rubber having a Shore hardness of 75 and a resistivity of 1 x 103 ohm.cm was wound around an aluminum pipe of 200 mm. outside diameter and 300 mm. width in a thickness of 10 mm. Nickel (corresponding to layer 26) was plated thereon in a thickness f 5h~ and selenium was further vacuum deposited thereon in a thick- `
ness of 80~to prepare the light-sensitive member on which an electrostatic latent image was formed in a conventional manner. Thereafter, liquid ink was supplied to the ink slots formed on the ink-supplying member made of iron pipe des-cribed in Example 1, and this ink-supplying member was brought into contact with the surface of the above-described light-sensitive member. There was obtained a good ;~
image on the photoconductive surface without damaging the selenium layer on the surface of the light-sensitive member.
Example 3 Silicone rubber having a Shore hardness of 75 3i~
and electric reisitivity of 1 x 10 ohn.cm was wound around an aluminum pipe of 200 mm. outside diameter and 300 mm. ~' width in a thickness of 10 mm. Nickel was ~lated thereon in a thickness of 5~ and a photoconductive surface of cadmium sulfide was further coated thereon in a thickness of 40~to prepare the light-sensitive member on which an electrostatic latent image was formed in a usual manner. Thereafter, liquid ink was supplied to the slots formed on the ink-supply member made of iron pipe described in Example 1, and this ink-supply member was brought into contact with the surface of the above-described light-sensitive member.
There was obtained a more distinct image than in Example 1 without damaging the surface of the light-sensitive member of cadmium sulfide.
Example 4 Urethane'rubber having a Shbre hardness o 75 -`
and electric resistivity of 1 x 103 ohm.cm was used instead of the silicone rubber used in Example 1, and a photoconduc- ~
tive substance of cadmium sulfide was coated thereon in ~^
a thickness of 40~ to prepare the light-sensitive member, to which liquid ink was applied by the same ink-supplying member as described in Example 1. There was obtained the same image quality as in Example 1 with no damage to the photoconductive layer.
In all of the above-described Examples, image quality can be stabilized by electrically grounding the ink-supply member 10, and further a more improved image -can be obtained by pressing, upon transferring at station ~ ' 34, the transfer paper by a rubber roller 36. The above operations can then be repeated at cleaning station 38. ' The liquid ink used in each of the foregoing '~
examples typically has a volume resistance of 1 x 105 to '~
';', ' ' ,. ~.
"
1 x 10 ohm.cm and a viscosity of from aibout lon ~ps. to . .
about 10,000 cps. and comprises a single phase. Examples of , thie composition are as follows: ..
(A) Polypropylene glycol (molecular ;. :-weight: 1025) 60% by weight ~:~
Microlith* CT Black (predespersed .: .
carbon black, made by Ciba :-.
Limited) . 25% by weight ~
RucofleX* TG-8 (triethylene : :.
glycol aicaprilate, made by . ~ :.
Hooker Chemical Co.)15~ by weight .~
(B) Light liquid ~araffin45% hy weighit :.
Microlith* CT Black (same as . ,:
in (A)) 25% by weight ~ ~ :
Ganex* V-216 (alkylated ,~:
polyvinylpyrrolidone, made by.C-eneral.Anyline25% by weight Solid paraffin 5~ by weight Numerous modifications of the invention will become apparent to one of ordinary skill in the art upon .. :
reading the foregoing disclosure. During such a reading .
it will be evident that this invention provides a unique apparatus and method utilizing wet-developing for accomplish- ~.
ing the objects and advantages hereinstated.
*trade marks ' :
- . ' ;, :., .. . . . . ..
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Apparatus for wet-developing an electrostatic latent image comprising:
an electroconductive ink-supply member having an uneven surface comprising a plurality of raised portions and depressions below said raised portions, at least the surface of said ink-supply member being electroconductive;
means for supplying ink to said ink-supply member so that the ink is held in said depressions;
an electrophotographic member bearing said electro-static latent image;
an elastic, electroconductive support member for said electrophotographic member, said support member having a resistivity no greater than 1010 ohm. cm; and means for bringing the ink-supply member and the electrophotographic member into substantial contact with one another so that said ink is attracted to said electro-static latent image to thereby develop the image while minimizing damage to the electrophotographic member because of the elasticity of said elastic support member.
an electroconductive ink-supply member having an uneven surface comprising a plurality of raised portions and depressions below said raised portions, at least the surface of said ink-supply member being electroconductive;
means for supplying ink to said ink-supply member so that the ink is held in said depressions;
an electrophotographic member bearing said electro-static latent image;
an elastic, electroconductive support member for said electrophotographic member, said support member having a resistivity no greater than 1010 ohm. cm; and means for bringing the ink-supply member and the electrophotographic member into substantial contact with one another so that said ink is attracted to said electro-static latent image to thereby develop the image while minimizing damage to the electrophotographic member because of the elasticity of said elastic support member.
2. Apparatus as in claim 1 where said ink-supply member includes an elastic portion; said uneven surface being the surface of said elastic portion and at least the surface of said elastic portion being electroconductive.
3. Apparatus as in claim 2 where said elastic, electro-conductive support member is electrically grounded.
4. Apparatus as in claim 1 where said ink-supply member is electrically grounded.
5. A method of wet-developing an electrostatic latent image comprising:
selecting an electroconductive, ink-supply member having an uneven surface comprising a plurality of raised portions and depressions below said raised portions, at least the surface of said ink-supply member being electroconductive;
supplying ink to said ink-supply member so that the ink is held in said depressions;
selecting an electrophotographic member bearing said electrostatic latent image;
selecting an elastic, electroconductive support mem-ber for said electrophotographic member, said support member having a resistivity no greater than 1010 ohm. cm; and bringing the ink-supply member and the electrophoto-graphic member into substantial contact with one another so that said ink is attracted to said electrostatic latent image to thereby develop the image while minimizing damage to the electrophotographic member because of the elasticity of said elastic support member.
selecting an electroconductive, ink-supply member having an uneven surface comprising a plurality of raised portions and depressions below said raised portions, at least the surface of said ink-supply member being electroconductive;
supplying ink to said ink-supply member so that the ink is held in said depressions;
selecting an electrophotographic member bearing said electrostatic latent image;
selecting an elastic, electroconductive support mem-ber for said electrophotographic member, said support member having a resistivity no greater than 1010 ohm. cm; and bringing the ink-supply member and the electrophoto-graphic member into substantial contact with one another so that said ink is attracted to said electrostatic latent image to thereby develop the image while minimizing damage to the electrophotographic member because of the elasticity of said elastic support member.
6. A method as in claim 5 where said ink-supply member includes an elastic portion, said uneven surface being disposed in on the surface of said elastic portion and at least the surface of said elastic portion being electro-conductive.
7. A method as in claim 6 where said elastic, electro-conductive support member is electrically grounded.
8. A method as in claim 5 where said ink-supply member is electrically grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA208,641A CA1044081A (en) | 1974-09-06 | 1974-09-06 | Electrostatic duplicating method and apparatus utilizing wet developing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA208,641A CA1044081A (en) | 1974-09-06 | 1974-09-06 | Electrostatic duplicating method and apparatus utilizing wet developing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1044081A true CA1044081A (en) | 1978-12-12 |
Family
ID=4101062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA208,641A Expired CA1044081A (en) | 1974-09-06 | 1974-09-06 | Electrostatic duplicating method and apparatus utilizing wet developing |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1044081A (en) |
-
1974
- 1974-09-06 CA CA208,641A patent/CA1044081A/en not_active Expired
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