Patent US3564131A successfully refreshed from Google Patents.
US3564131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spatially modulated halftone dot image generation system
Assignee: RCA Corp
•
Filing: 1967-12-22
•
Granted: 1971-02-16
•
Expires: 1987-12-22
Abstract
Abstract A halftone image generation system produces a replica of an original continuous tone pattern by utilizing halftone dots of substantially the same size. The continuous tones in the original pattern are duplicated in the halftone image thereof by varying the spacing between the halftone dots. The spaces between the halftone dots are, for example, small when a dense tone is duplicated, whereas the spacing is made larger when a less dense tone is duplicated. The halftone dot generator in the system may, for example, comprise an electronic imaging device that generates the halftone dots in the form of light radiation for focusing onto photographic film; or an optical device, such as a laser, that forms the halftone dots a indentations or cavities on a printing plate, or similar devices.
Inventors
- 👤 Edward W Herold
- 👤 Kenneth H Fischbeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:28
CPC Classifications
G; G02; G02F; G02F1/00; B; B23; B23K; B23K26/00; B23K26/08; B23K26/083; B23K26/0853; H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4051
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
71 words
A system to provide an image of a continuous tone pattern comprising in combination: means for optically scanning said pattern to produce optical image signals, means for transducing said image signals into electronic pulses having pulse repetition rates that are inversely proportional to the desired brightness of said image, and means for introducing into said electronic pulses random pulse timing that is directly proportional to the desired brightness of said image.
Claim 2
Independent Claim
71 words
A system to provide an image of a continuous tone pattern comprising in combination: means for optically scanning said pattern to produce optical image signals, means for transducing said image signals into electronic pulses having pulse repetition rates that are inversely proportional to the desired brightness of said image, and means for introducing into said electronic pulses random pulse timing that is directly proportional to the desired brightness of said image.
Claim 3
Independent Claim
100 words
A system to reproduce on a surface having a given spectrally-dependent reflectance patterns of variable light reflectances comprising in combination: means providing a plurality of similar visually subliminal areas having a spectrally-dependent reflectance that differs from said given reflectance of said surface, means for varying the spacing between said subliminal areas in portions of said surface to provide average spacings in said portions that are substantially inversely proportional to desired changes in said given reflectance of said surface, and means for introducing random variations into said spacings with said random variations being proportional to the average spacings in said portions.
Claim 4
Independent Claim
100 words
A system to reproduce on a surface having a given spectrally-dependent reflectance patterns of variable light reflectances comprising in combination: means providing a plurality of similar visually subliminal areas having a spectrally-dependent reflectance that differs from said given reflectance of said surface, means for varying the spacing between said subliminal areas in portions of said surface to provide average spacings in said portions that are substantially inversely proportional to desired changes in said given reflectance of said surface, and means for introducing random variations into said spacings with said random variations being proportional to the average spacings in said portions.
Claim 5
Dependent Claim
25 words
A system in accordance with claim 2 wherein said subliminal areas are formed by exposing a photosensitive surface to light created in an imaging device.
References Cited (Backward Citations)
US2060778A
Cited
US2136340A
Cited
US2892887A
Cited
US3197558A
Cited
US3461229A
Cited
US3517119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |