US4926200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic printer
Assignee: Koki Holdings Co Ltd
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Filing: 1989-07-28
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Granted: 1990-05-15
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Expires: 2009-07-28
Abstract
Abstract In an electrophotographic printer, a photoconductive drum is scanned with a light spot provided by scanning light sources to electrostatically form a latent image with dot on it. The light sources comprise at least two LED print heads different in linear density are provided to print out data different in linear density on one and the same page.
Inventors
- 👤 Mineo Ohyama
- 👤 Shigenobu Katagiri
- 👤 Hiroomi Kozawa
- 👤 Koutaro Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:13
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1238; G06K15/1242; G06K15/1247; G03; G03G; G03G15/00; G03G15/04; G03G15/04036; G03G15/04045; G03G15/04054; G03G15/22; G03G15/32; G03G15/326
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
An electrophotographic printer for printing data on a printing sheet, comprising: photo-conductive means having a surface to be charged; means for electrically charging the surface of said photo-conductive means; scanning light source means for scanning a light spot on said photo-conductive means to electrostatically form a latent image of print data with dots thereon, said scanning light source means including at least two scanning light sources different in dot density from each other; means for developing the latent image into toner image on said photo-conductive means; means for transferring said toner image onto a printing sheet; and means for fixing said toner image on said printing sheet by pressing and heating operation.
Claim 2
Dependent Claim
112 words
An electrophotographic printer for printing data on a printing sheet, comprising: photo-conductive means having a surface to be charged; means for electrically charging the surface of said photo-conductive means; scanning light source means for scanning a light spot on said photo-conductive means to electrostatically form a latent image of print data with dots thereon, said scanning light source means including at least two scanning light sources different in dot density from each other; means for developing the latent image into toner image on said photo-conductive means; means for transferring said toner image onto a printing sheet; and means for fixing said toner image on said printing sheet by pressing and heating operation.
Claim 3
Dependent Claim
20 words
An electrophotographic printer as claimed in claim 1, wherein each of said scanning light sources comprises an LED print head.
Claim 4
Dependent Claim
33 words
An electrophotographic printer as claimed in claim 1, wherein said scanning light source means comprises an LED head, and said scanning light sources comprise at least two LED arrays provided said LED head.
Claim 5
Dependent Claim
39 words
An electrophotographic printer as claimed in claim 1, wherein said print data comprise EDP data and image data, and one of said two scanning light sources being for the EDP data and the other being for the image data.
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) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |