US4189752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic screening with galvanometer recorders
Assignee: Printing Developments Inc
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Filing: 1978-08-25
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Granted: 1980-02-19
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Expires: 1998-08-25
Abstract
Abstract A continuous-tone image, which can be in full color, is scanned to produce color-separation images in halftone dots. Edges of features in the scanned image are sensed, and the positions and shapes of the halftone dots that define corresponding edges in the halftone reproductions are adjusted so that they conform better to the feature edges. This reduces or eliminates the apparent serrations or roughness of feature edges in the halftone reproductions otherwise caused by misalignment of the halftone dots with the feature edges and improves image definition.
Inventors
- 👤 William W. Moe
- 👤 Robert W. Lotz
- 👤 Ethan R. Green
- 👤 Rodolfo Fazio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:32
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/52; H04N1/40; H04N1/40093; H04N1/405; H04N1/4055; H04N1/4058
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
125 words
Apparatus comprising means for optically scanning an input image, a radiation-sensitive output film, means for generating a beam of electromagnetic radiation for forming halftone dots on said output film by which at least one output image corresponding to said input image is constituted, means including a position mirror and modulator means controlling the orientation of said position mirror for controlling the position of said beam on said output film, and means including a width mirror, modulator means controlling the orientation of said width mirror, and chopper means for independently controlling the width of said beam on said output, said position mirror being optically between said chopper means and said output film and said width mirror being optically between said generating means and said chopper means.
Claim 2
Dependent Claim
125 words
Apparatus comprising means for optically scanning an input image, a radiation-sensitive output film, means for generating a beam of electromagnetic radiation for forming halftone dots on said output film by which at least one output image corresponding to said input image is constituted, means including a position mirror and modulator means controlling the orientation of said position mirror for controlling the position of said beam on said output film, and means including a width mirror, modulator means controlling the orientation of said width mirror, and chopper means for independently controlling the width of said beam on said output, said position mirror being optically between said chopper means and said output film and said width mirror being optically between said generating means and said chopper means.
Claim 3
Dependent Claim
25 words
Apparatus according to claim 1 wherein said means for generating electromagnetic radiation is a laser and said beam of electromagnetic radiation is a laser beam.
Claim 4
Dependent Claim
31 words
Apparatus according to claim 1 wherein said chopper means comprises knife edge means for intercepting at least a portion of the width of said beam as reflected by said width mirror.
Claim 5
Dependent Claim
30 words
Apparatus according to claim 1 wherein said chopper means comprises chopper mirror means for reflecting a variable proportion of the width of said beam as reflected by said width mirror.
Claim 6
Dependent Claim
24 words
Apparatus according to claim 1 wherein said modulator means for said position mirror and said modulator means for said width mirror comprise galvanometer means.
Claim 7
Dependent Claim
16 words
Apparatus according to claim 5 further comprising galvanometer drive amplifier means for controlling said galvanometer means.
Claim 8
Dependent Claim
25 words
Apparatus according to claim 6 further comprising dot-forming circuit means for generating at least two output signals for input to said galvanometer drive amplifier means.
References Cited (Backward Citations)
GB656235A
Cited
US2818465A
Cited
US3197558A
Cited
US3153698A
Cited
US3413411A
Cited
GB1181153A
Cited
DE1772022A1
Cited
NL6804028A
Cited
GB1206681A
Cited
FR1605174A
Cited
US3506779A
Cited
US3646262A
Cited
US3636251A
Cited
US3627908A
Cited
DE2012728A1
Cited
DE2208658A1
Cited
US3887939A
Cited
US3956587A
Cited
US3983319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |