Claims
- 1. In an electrographic printing system wherein a latent image is electrographically transferred to a dielectric record member from an image-bearing electrode in close proximity to said member, which image may be subsequently rendered visible by application of a toner and permanently fixed into said member, the improvement which is characterized in that:
- (a) said dielectric record member is a transparent dielectric film comprising:
- (i) a transparent resin film base,
- (ii) a transparent permanently conductive layer on said base, and
- (iii) a transparent dielectric coating having a thickness of about 1.4-10 micrometers on said layer, and, wherein
- (b) means are provided to transport said film record member at a controlled rapid rate across said electrode, thereby to provide clear, sharp, high contrast images on said film.
- 2. The electrographic printing system according to claim 1 wherein said dielectric coating includes an anti-blocking material to enable said film record member to be unrolled without sticking.
- 3. The electrographic printing system according to claim 2 wherein said anti-blocking material is polyethylene or silica particles which comprise about 0.1-25% by weight of said dielectric resin.
- 4. The electrographic printing system according to claim 1 wherein the dielectric coating is selected from acrylics, styrenated acrylics, polyolefins, alkyd resins, polyester resins, polyvinyl resins, cellulose acetates, epoxide resins, copolymers of the above, and shellacs.
- 5. The electrographic printing system according to claim 1 wherein said electrode is a character, pin or stylus electrode.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of co-pending application Ser. No. 017,131, filed Mar. 5, 1979, which is a continuation of application Ser. No. 806,379, filed June 14, 1977, abandoned, which is a divisional of application Ser. No. 718,361, filed Aug. 27, 1976 now U.S. Pat. No. 4,112,172, which is a continuation-in-part of Ser. No. 669,675, filed Mar. 23, 1976, abandoned.
US Referenced Citations (5)
Divisions (1)
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Date |
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718361 |
Aug 1976 |
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Continuations (1)
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Date |
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Parent |
806379 |
Jun 1977 |
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Continuation in Parts (2)
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17131 |
Mar 1979 |
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Parent |
669675 |
Mar 1976 |
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