US3853553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for image transfer using persistent internal polarization
Assignee: Minolta Co Ltd
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Filing: 1969-11-24
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Granted: 1974-12-10
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Expires: 1989-11-24
Abstract
Abstract 1. A photosensitive plate comprising a photoconductive layer having persistent internal polarization characteristics is interposed between an electrically insulating layer and an electrically conductive layer and used in a method for forming a latent electrostatic image on the photosensitive plate by first exposing the image onto the photoconductive layer and simultaneously applying a DC. corona discharge to the photoconductive layer. An AC. corona discharge is then applied to the dark patterns of the latent electrostatic image and the photosensitive plate is then uniformly irradiated to enhance the contrast of the latent electrostatic image.
Inventors
- 👤 T Yasuie
- 👤 K Seino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:17
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/024; G03G13/00; G03G13/056; G03G5/14; G03G5/147
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
37 words
AN ELECTRONIC PHOTOGRAPHING METHOD FOR A PHOTOSENSITIVE PLATE OF THE TYPE WHEREIN A PHOTOCONDUCTIVE LAYER HAVING A PERSISTENT INTERNAL POLARIZATION CHARACTERISTIC IS INTERPOSED BETWEEN AN ELECTRICALLY INSULATING LAYER AND AN ELECTRICALLY CONDUCTIVE LAYER, COMPRISING THE STEP OF:
Claim 2
Dependent Claim
37 words
AN ELECTRONIC PHOTOGRAPHING METHOD FOR A PHOTOSENSITIVE PLATE OF THE TYPE WHEREIN A PHOTOCONDUCTIVE LAYER HAVING A PERSISTENT INTERNAL POLARIZATION CHARACTERISTIC IS INTERPOSED BETWEEN AN ELECTRICALLY INSULATING LAYER AND AN ELECTRICALLY CONDUCTIVE LAYER, COMPRISING THE STEP OF:
Claim 3
Dependent Claim
67 words
EXPOSING AN ORIGINAL IMAGE ONTO SAID PHOTOCONDUCTIVE LAYER AND SIMULTANEOUSLY CHARGING SAID ELECTRICALLY INSULATING LAYER BY THE DIFFERENCE OF SURFACE ELECTRIC POBY PERSISTENT INTERNAL POLARIZATION OF SAID PHOTOCONDUCTIVE LAYER ACCORDING TO THE LIGHT PORTION OF SAID ORIGINAL IMAGE AND AN ELECTROSTATIC IMAGE ON SAID ELECTRICALLY INSULATING LAYER BY THE DIFFERENCE OF SURFACE ELECTRIC POTENTIAL PRODUCED IN ACCORDANCE WITH THE LIGHT AND DARK PATTERNS OF SAID ORIGINAL IMAGES,
Claim 4
Dependent Claim
67 words
EXPOSING AN ORIGINAL IMAGE ONTO SAID PHOTOCONDUCTIVE LAYER AND SIMULTANEOUSLY CHARGING SAID ELECTRICALLY INSULATING LAYER BY THE DIFFERENCE OF SURFACE ELECTRIC POBY PERSISTENT INTERNAL POLARIZATION OF SAID PHOTOCONDUCTIVE LAYER ACCORDING TO THE LIGHT PORTION OF SAID ORIGINAL IMAGE AND AN ELECTROSTATIC IMAGE ON SAID ELECTRICALLY INSULATING LAYER BY THE DIFFERENCE OF SURFACE ELECTRIC POTENTIAL PRODUCED IN ACCORDANCE WITH THE LIGHT AND DARK PATTERNS OF SAID ORIGINAL IMAGES,
Claim 5
Dependent Claim
35 words
APPLYING AN AC. CORONA DISCHARGE TO THE DARK PATTERN OF SAID ELECTRICALLY INSULATING LAYER THEREBY LEAVING AN ELECTRIC CHARGE ONLY ON SAID ELECTRICALLY INSULATING LAYER CORRESPONDNG TO THE LIGHT PORTION OF THE LIGHT IMAGE, AND
Claim 6
Dependent Claim
35 words
APPLYING AN AC. CORONA DISCHARGE TO THE DARK PATTERN OF SAID ELECTRICALLY INSULATING LAYER THEREBY LEAVING AN ELECTRIC CHARGE ONLY ON SAID ELECTRICALLY INSULATING LAYER CORRESPONDNG TO THE LIGHT PORTION OF THE LIGHT IMAGE, AND
Claim 7
Dependent Claim
28 words
A method as claimed in claim 1, wherein said conductive layer has photo-transmissible characteristics, and said photoconductive layer is exposed with said conductive layer facing said original image.
Claim 8
Dependent Claim
35 words
applying an AC. corona discharge to the dark pattern of said electrically insulating layer thereby leaving an electric charge only on said electrically insulating layer corresponding to the light portion of the light image, and
Claim 9
Dependent Claim
35 words
applying an AC. corona discharge to the dark pattern of said electrically insulating layer thereby leaving an electric charge only on said electrically insulating layer corresponding to the light portion of the light image, and
Claim 10
Dependent Claim
40 words
uniformly irradiating said photosensitive plate to reduce the surface electric potential of the dark pattern of electrically insulating layer to zero potential and the surface electric potential of said light pattern of said electrically insulating layer to a high potential.
Claim 11
Dependent Claim
40 words
uniformly irradiating said photosensitive plate to reduce the surface electric potential of the dark pattern of electrically insulating layer to zero potential and the surface electric potential of said light pattern of said electrically insulating layer to a high potential.
Claim 12
Dependent Claim
17 words
A method as claimed in claim 1, wherein said photoconductive layer is composed of a P-type photosemiconductor.
Claim 13
Dependent Claim
40 words
UNIFORMLY IRRADIATING SAID PHOTOSENSITIVE PLATE TO REDUCE THE SURFACE ELECTRIC POTENTIAL OF THE DARK PATTERN OF ELECTRICALLY INSULTAING LAYER TO ZERO POTENTIAL AND THE SURFACE ELECTRIC POTENTIAL OF SAID LIGHT PATTERN OF SAID ELECTRICALLY INSULATING LAYER TO A HIGH POTENTIAL.
Claim 14
Dependent Claim
40 words
UNIFORMLY IRRADIATING SAID PHOTOSENSITIVE PLATE TO REDUCE THE SURFACE ELECTRIC POTENTIAL OF THE DARK PATTERN OF ELECTRICALLY INSULTAING LAYER TO ZERO POTENTIAL AND THE SURFACE ELECTRIC POTENTIAL OF SAID LIGHT PATTERN OF SAID ELECTRICALLY INSULATING LAYER TO A HIGH POTENTIAL.
Claim 15
Dependent Claim
30 words
A method as claimed in claim 1, wherein said electrically insulating layer has photo-transmissible characteristics, and said photoconductive layer is exposed with said electrically insulating layer facing said original image.
Claim 16
Dependent Claim
17 words
A method as claimed in claim 4, wherein said photoconductive layer is composed of an N-type photosemiconductor.
References Cited (Backward Citations)
US3438706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |