US3611006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube system
Assignee: ANACOMP Inc 11550 NORTH MERIDAN STREET CARMEL INDIANA 46032 A CORP OF INDIANA
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Filing: 1969-07-14
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Granted: 1971-10-05
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Expires: 1989-07-14
Abstract
Abstract A cathode-ray tube system is described for producing a graphic image having areas of different tone levels. The image is produced by a plurality of dots of different sizes, each size corresponding to one of the tone levels. The cross section of the electron beam is shaped by passing it through an aperture, and the size of the cross section is regulated by controlling the degree of magnification thereof.
Inventors
- 👤 Joseph E Eichberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:30
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
179 words
A cathode-ray tube system for producing a graphic image having areas of different tone levels, comprising, an electron beam source adapted to issue a beam of a substantially constant current, an electron opaque member having at least one aperture therein to form at least a portion of the cross section of the beam into a predetermined shape, an electron responsive target screen for displaying the image, means for forming an electron image of said aperture on said screen at a selected one of a plurality of magnifications corresponding to different image tone levels, means for selecting a magnification in accordance with a desired tone level in an area of the image being reproduced, and means for directing the beam to a succession of predetermined areas on the target screen and means for varying the time duration which the beam impinges on each of the succession of predetermined areas on the target screen according to the dot area, thereby to define a graphic image by means of a plurality of dots having sizes corresponding to the desired image tone levels.
Claim 2
Dependent Claim
179 words
A cathode-ray tube system for producing a graphic image having areas of different tone levels, comprising, an electron beam source adapted to issue a beam of a substantially constant current, an electron opaque member having at least one aperture therein to form at least a portion of the cross section of the beam into a predetermined shape, an electron responsive target screen for displaying the image, means for forming an electron image of said aperture on said screen at a selected one of a plurality of magnifications corresponding to different image tone levels, means for selecting a magnification in accordance with a desired tone level in an area of the image being reproduced, and means for directing the beam to a succession of predetermined areas on the target screen and means for varying the time duration which the beam impinges on each of the succession of predetermined areas on the target screen according to the dot area, thereby to define a graphic image by means of a plurality of dots having sizes corresponding to the desired image tone levels.
Claim 3
Dependent Claim
37 words
A cathode-ray tube system according to claim 1 wherein said focusing means define at least two electron lenses, and wherein said selecting means include means for varying the effective focal length of each of said electron lenses.
Claim 4
Dependent Claim
45 words
A cathode-ray tube system according to claim 1 wherein said aperture is of a polygonal shape capable of being distributed in a pattern in which the shapes complement each other to leave no space therebetween and to provide no overlap areas at the largest magnification.
Claim 5
Dependent Claim
38 words
A cathode-ray tube system according to claim 1 wherein said electron opaque member includes a plurality of further apertures shaped to define characters, whereby said tube may be operated to display written information as well as graphic images.
Claim 6
Dependent Claim
28 words
A cathode-ray tube system according to claim 1 wherein said beam directing means are adapted to distribute the dots within each row with uniform center to center spacing.
Claim 7
Dependent Claim
42 words
A cathode-ray tube system according to claim 5 whErein said beam directing means are adapted to distribute the dots in a rectilinear pattern in which the dots in each horizontal row are offset from the dots in the immediately adjacent horizontal rows.
References Cited (Backward Citations)
US3354335A
Cited
US3501673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |