US4468442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing half-tone printing plates
Assignee: Dainippon Screen Manufacturing Co Ltd
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Filing: 1982-07-30
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Granted: 1984-08-28
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Expires: 2002-07-30
Abstract
Abstract The proposed method for making half-tone images on printing plates comprises a step of individually controlling light beams to switch them on and off according to whether a reference value representing a photographic density of minute point of an original picture is or is not smaller than numeral signals allotted to many divisional elements constituting each of many small dots, wherein a unit area corresponding to single dot area is divided into plural fine network patterns each having its own tone reproduction characteristic different from those of other patterns whereby the resulting soft dots can be dot-etched for color retouching of the half-tone images.
Inventors
- 👤 Takashi Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:06
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40081; H04N1/405; H04N1/4055
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
A method for making half-tone printing plates, the method comprising a step of controlling individually each of plural fine lighting points disposed above recording films transversely of the scanning direction of light beams in such a manner as to switch on and off the lighting points in accordance with such image signals or dot signals corresponding thereto that originate from an original picture to be recorded, characterized in that a unit area corresponding to a single dot area is divided into plural fine network patterns wherein the patterns are different from each other in their tone reproduction characteristics and are respectively composed of many divisional elements defined so as not to overlap each other, and that the light beams are controlled to be switched on and off according to a reference signal corresponding to one of said sequential image signals and also according to other signals from said fine network patterns wherein the latter signals are defined to alter in correspondence with such positions in the single dot unit area that are to be exposed to said light beams.
Claim 2
Independent Claim
179 words
A method for making half-tone printing plates, the method comprising a step of controlling individually each of plural fine lighting points disposed above recording films transversely of the scanning direction of light beams in such a manner as to switch on and off the lighting points in accordance with such image signals or dot signals corresponding thereto that originate from an original picture to be recorded, characterized in that a unit area corresponding to a single dot area is divided into plural fine network patterns wherein the patterns are different from each other in their tone reproduction characteristics and are respectively composed of many divisional elements defined so as not to overlap each other, and that the light beams are controlled to be switched on and off according to a reference signal corresponding to one of said sequential image signals and also according to other signals from said fine network patterns wherein the latter signals are defined to alter in correspondence with such positions in the single dot unit area that are to be exposed to said light beams.
Claim 3
Dependent Claim
47 words
A method as set forth in claim 1 wherein said plural fine network patterns each having a tone reproduction characteristic different from each other are charged into a single memory device, the patterns being composed of the divisional elements defined so as not to overlap each other.
Claim 4
Dependent Claim
47 words
A method as set forth in claim 1 wherein said plural fine network patterns each having a tone reproduction characteristic different from each other are respectively charged into different memory devices, the patterns being composed of the divisional elements defined so as not to overlap each other.
Claim 5
Independent Claim
52 words
A method as set forth in any of claims 1 to 3 wherein the diameters of said light beams to be irradiated onto the recording films are determined such that the divisional elements to be prevented from being exposed are also exposed to the light beams irradiating onto the neighboring divisional elements.
References Cited (Backward Citations)
US4025189A
Cited
JPS5233523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |