US4392719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming method and apparatus
Assignee: Fujifilm Business Innovation Corp
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Filing: 1980-07-15
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Granted: 1983-07-12
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Expires: 2000-07-15
Abstract
Abstract An image forming method and device for use in a document copier in which an optical image is projected upon a memory liquid crystal cell. A voltage is applied to the cell to determine whether the image recorded thereupon is a positive or negative image. The image recorded upon the memory liquid crystal cell is then projected upon a recording medium. A second image can be combined with that from the memory liquid crystal cell and projected therewith onto the recording medium.
Inventors
- 👤 Sohichi Sekimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:16
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/04009; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1238; G06K15/1276
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
246 words
A system for forming an image onto a photosensitive recording medium comprising: a memory liquid crystal cell having a layer of nematic-cholesteric phase transition type memory liquid crystals, a photoconductive layer disposed adjacent said memory liquid crystal layer, and transparent electrodes sandwiching said memory liquid crystal layer and said photoconductive layer; means for projecting an optical image onto said memory liquid crystal cell comprising first means to project a positive original optical image on said memory liquid crystal cell for recording as a latent image and second means for projecting a negative original optical image either onto said memory liquid crystal cell as a latent image or onto said photosensitive recording medium without forming a latent image; means for applying a predetermined voltage to said memory liquid crystal cell to determine the polarity of an image recorded thereon; wherein said means for applying a predetermined voltage comprises, a voltage source and circuit means for applying a bias voltage from said source having a polarity determined by whether the original image is a positive or negative original optical image means for projecting an optical image from said memory liquid crystal cell to said photosensitive recording medium comprising a light source, a first lens, a half-silvered mirror positioned to direct light from said light source focused through said first lens onto the surface of said memory liquid crystal cell, and a second lens receiving light transmitted through said half-silvered mirror and focusing it onto said photosensitive recording medium.
Claim 2
Independent Claim
246 words
A system for forming an image onto a photosensitive recording medium comprising: a memory liquid crystal cell having a layer of nematic-cholesteric phase transition type memory liquid crystals, a photoconductive layer disposed adjacent said memory liquid crystal layer, and transparent electrodes sandwiching said memory liquid crystal layer and said photoconductive layer; means for projecting an optical image onto said memory liquid crystal cell comprising first means to project a positive original optical image on said memory liquid crystal cell for recording as a latent image and second means for projecting a negative original optical image either onto said memory liquid crystal cell as a latent image or onto said photosensitive recording medium without forming a latent image; means for applying a predetermined voltage to said memory liquid crystal cell to determine the polarity of an image recorded thereon; wherein said means for applying a predetermined voltage comprises, a voltage source and circuit means for applying a bias voltage from said source having a polarity determined by whether the original image is a positive or negative original optical image means for projecting an optical image from said memory liquid crystal cell to said photosensitive recording medium comprising a light source, a first lens, a half-silvered mirror positioned to direct light from said light source focused through said first lens onto the surface of said memory liquid crystal cell, and a second lens receiving light transmitted through said half-silvered mirror and focusing it onto said photosensitive recording medium.
Claim 3
Dependent Claim
21 words
The recording device of claim 1 further comprising means for combining an image with the image transmitted through said half-silvered mirror.
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) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |