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US3824012A
Expired / Lapsed
US
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Process and apparatus for transferring electrostatic latent images in electrophotography
Assignee: Minolta Co Ltd
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Filing: 1973-02-08
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Granted: 1974-07-16
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Expires: 1993-02-08
Abstract
Abstract A dielectric layer of copy paper is brought into contact with an electrostatic latent image bearing surface of a photosensitive plate by a first roller having an electric resistance value substantially higher than the rear face resistance value of the copy paper, the photosensitive plate having on its front face a dielectric layer for forming the latent image thereon and driven by a grounded roller. An electrically conductive lining element of the copy paper is substantially grounded by an electrically conductive second roller to transfer the electrostatic latent image by air-breakdown discharge under the influence of the first and second rollers. The gap between the photosensitive plate and the copy paper has a width for air-breakdown discharge according to Paschen''s law.
Inventors
- 👤 I Iizaka
- 👤 T Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:27
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
145 words
A METHOD OF PREPARING A MONOCRYSTALLINE OXIDE OF INCREASED PARTICLE SIZE OF AT LEAST OE ELEMENT SELECTED FROM THE GROUP CONSISTING OF YTTRIUM, LANTHANUM AND THE LANTHANIDES COMPRISING PREPARING A MIXTURE OF A POLYCRYSTALLINE POWDER OF AT LEAST ONE OF SAID OXIDES AND FORM 0.1 TO 2 MOL PER MOL OF SAID OXIDES OF AT LEAST ONE CARBONATE OF AN ALKALI METAL SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, RUBIDIUM AND CESIUM AND HEATING SAID MIXTURE AT A TEMPERATURE OF ABOUT 1000*C. TO 1400*C. TIVE PLATE BY A FIRST ROLLER HAVING AN ELECTRIC RESISTANCE VALUE SUBSTANTIALLY HIGHER THAN THE REAR FACE RESISTANCE VALUE OF THE COPY PAPER, THE PHOTOSENSITIVE PLATE HAVING ON ITS FRONT FACE A DIELECTRIC LAYER FOR FORMING THE LATENT IMAGE THEREON AND DRIVEN BY A GROUNDED ROLLER. AN ELECTRICALLY CONDUCTIVE LINING ELEMENT OF THE COPY PAPER IS SUBSTANTIALLY GROUNDED BY AN
Claim 2
Independent Claim
145 words
A METHOD OF PREPARING A MONOCRYSTALLINE OXIDE OF INCREASED PARTICLE SIZE OF AT LEAST OE ELEMENT SELECTED FROM THE GROUP CONSISTING OF YTTRIUM, LANTHANUM AND THE LANTHANIDES COMPRISING PREPARING A MIXTURE OF A POLYCRYSTALLINE POWDER OF AT LEAST ONE OF SAID OXIDES AND FORM 0.1 TO 2 MOL PER MOL OF SAID OXIDES OF AT LEAST ONE CARBONATE OF AN ALKALI METAL SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, RUBIDIUM AND CESIUM AND HEATING SAID MIXTURE AT A TEMPERATURE OF ABOUT 1000*C. TO 1400*C. TIVE PLATE BY A FIRST ROLLER HAVING AN ELECTRIC RESISTANCE VALUE SUBSTANTIALLY HIGHER THAN THE REAR FACE RESISTANCE VALUE OF THE COPY PAPER, THE PHOTOSENSITIVE PLATE HAVING ON ITS FRONT FACE A DIELECTRIC LAYER FOR FORMING THE LATENT IMAGE THEREON AND DRIVEN BY A GROUNDED ROLLER. AN ELECTRICALLY CONDUCTIVE LINING ELEMENT OF THE COPY PAPER IS SUBSTANTIALLY GROUNDED BY AN
Claim 3
Dependent Claim
40 words
The apparatus as set forth in claim 1 wherein the first and second rollers are controlled to provide a gap of at least 10 microns between the photosensitive plate and the copy paper to complete the transfer across the gap.
Claim 4
Dependent Claim
22 words
The apparatus as set forth in claim 1 wherein the first roller is substantially a highly insulating roller which is electrically ungrounded.
Claim 5
Dependent Claim
32 words
The apparatus as set forth in claim 1 wherein the first roller is grounded by way of a resistor having a resistance higher than the rear face resistance of the copy paper.
Claim 6
Dependent Claim
15 words
The apparatus as set forth in claim 4 wherein the resistor is a variable resistor.
Claim 7
Dependent Claim
20 words
The apparatus as set forth in claim 1 wherein the first roller is made of an electrically highly insulating material.
Claim 8
Dependent Claim
25 words
The apparatus as set forth in claim 1 wherein the first roller is made of an electrically conductive material and is ungrounded and substantially insulated.
Claim 9
Dependent Claim
40 words
The apparatus as set forth in claim 1 wherein the first roller is made of an electrically conductive material and is grounded by way of a resistor having a resistance higher than the rear face resistance of the copy paper.
Claim 10
Dependent Claim
65 words
The apparatus as set forth in claim 1 wherein a guide member is provided between the first roller and the second roller for supporting the rear face of the copy paper travelling in contact with the photosensitive plate to guide the paper, the guide member being made of a material having a high resistance not lower than the rear face resistance of the copy paper.
Claim 11
Dependent Claim
39 words
The apparatus as set forth in claim 9 wherein the guide member comprises endless belts reeved around the first and second rollers and having an electric resistance value approximately lower than the rear face resistance of the copy paper.
Claim 12
Dependent Claim
73 words
The apparatus as set forth in claim 9 wherein the guide member comprises narrow belts reeved around the first roller and the second roller and engaged in a suitable number of grooves formed in the peripheral surface of the first roller so as to be positioned in place, the belts having a resistance substantially higher than the rear face resistance of the copy paper and being made of a flexible soft elastic material.
Claim 13
Dependent Claim
30 words
The apparatus as set forth in claim 11 wherein the narrow belts are made of a substantially electrically insulating material and have a width of not greater than 5 mm.
Claim 14
Dependent Claim
51 words
The apparatus as set forth in claim 9 wherein the guide member comprises an assembly of several guide blades having guide edges along the path of travel of the copy paper between the first roller and the second roller and the guide blades are made of a substantially highly insulating material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |