US4860115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital copier with a facsimile function
Assignee: Ricoh Co Ltd
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Filing: 1988-05-09
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Granted: 1989-08-22
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Expires: 2008-05-09
Abstract
Abstract A digital copier or like image forming apparatus having a facsimile function is provided with two different matrices for halftone processing which are selectively used depending upon the operation mode, i.e., a copy mode or a facsimile mode.
Inventors
- 👤 Masaaki Ogura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:03
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/32; H04N1/333; H04N1/33307; H04N1/33315; H04N1/00002; H04N1/00007; H04N1/00071; H04N1/00074; H04N1/00079; H04N1/00567; H04N1/0062; H04N1/00623; H04N1/00681; H04N1/00684; H04N1/00708; H04N1/00713; H04N1/00729; H04N1/00763; H04N1/00771; H04N1/00774; H04N1/32358; H04N1/32443; H04N1/32448; H04N1/32496; H04N1/33338; H04N1/40; H04N1/405; H04N1/00127; H04N1/00344
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
An image forming apparatus comprising: image reading means for reading and converting an image carried on an original document into an electric signal to produce an image signal; first reference signal generating means for outputting a first reference signal according to a first rule; second reference signal generating means for producing a second reference signal according to a second rule which is different from said first rule; selecting means for selecting one of the first and second reference signals to produce a selection signal; comparing means for comparing the image signal and the selection signal to produce a comparison signal; density converting means for converting the comparison signal with respect to density; and control means for applying selection command signals to said selecting means and to said density converting means.
Claim 2
Dependent Claim
130 words
An image forming apparatus comprising: image reading means for reading and converting an image carried on an original document into an electric signal to produce an image signal; first reference signal generating means for outputting a first reference signal according to a first rule; second reference signal generating means for producing a second reference signal according to a second rule which is different from said first rule; selecting means for selecting one of the first and second reference signals to produce a selection signal; comparing means for comparing the image signal and the selection signal to produce a comparison signal; density converting means for converting the comparison signal with respect to density; and control means for applying selection command signals to said selecting means and to said density converting means.
Claim 3
Dependent Claim
24 words
An image forming apparatus as claimed in claim 1, wherein said control means applies a density conversion command signal to said density converting means.
Claim 4
Dependent Claim
31 words
An image forming apparatus as claimed in claim 2, wherein said control means applied to said selecting means a selection command signal which is associated with the density conversion command signal.
Claim 5
Dependent Claim
53 words
An image forming apparatus as claimed in claim 3, further comprising: image recording means for recording an image in response to the image signal; image transmitting means for transmitting the image signal; and commanding means for producing a command signal which selects one of said image recording means and said image transmitting means.
Claim 6
Dependent Claim
26 words
An image forming apparatus as claimed in claim 4, wherein said control means produces a density conversion command signal which is associated with the command signal.
References Cited (Backward Citations)
US4651293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |