Patent US5084656A successfully refreshed from Google Patents.
US5084656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CRT beam deflection control system
Assignee: MAC ACQUISITION I Inc (CO CORP)
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Filing: 1991-02-05
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Granted: 1992-01-28
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Expires: 2011-02-05
Abstract
Abstract Disclosed is a system having a vertical position register and a horizontal deflection controller to position an electron beam within a CRT used to project an image onto a photographic medium for printing. When data is being displayed on the CRT, the beam is positioned vertically to the desired color phosphor row and then swept across the face of the CRT while the data is used to modulate the beam. During retrace, the beam is stopped at the center of the CRT and displaced vertically to a home position while waiting for the next dot row of information. The home position is located above the center of the phosphor area so that no leakage occurs if the beam remains in the home position for extended periods. Furthermore, while in the home position at the center of the CRT, the horizontal deflection amplifier dissipates a minimum amount of power.
Inventors
- 👤 Thomas A. Sturm
- 👤 James L. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:06
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/98; G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1233
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
142 words
A beam deflection system for a CRT having an electron beam for illuminating a phosphor area on the face of the CRT, said beam deflection system comprising: vertical positioning means for producing vertical deflection control data for positioning the electron beam at one of a plurality of predefined vertical positions on the face of the CRT; horizontal positioning means for producing horizontal deflection control data for sweeping the electron beam from a left side position on the face of the CRT to a right side position on the face of the CRT; and home positioning means for controlling said vertical positioning means and said horizontal positioning means to place the electron beam at a home position outside the phosphor area during an idle period of the electron beam and for maintaining the electron beam in said home position during said idle period.
Claim 2
Dependent Claim
142 words
A beam deflection system for a CRT having an electron beam for illuminating a phosphor area on the face of the CRT, said beam deflection system comprising: vertical positioning means for producing vertical deflection control data for positioning the electron beam at one of a plurality of predefined vertical positions on the face of the CRT; horizontal positioning means for producing horizontal deflection control data for sweeping the electron beam from a left side position on the face of the CRT to a right side position on the face of the CRT; and home positioning means for controlling said vertical positioning means and said horizontal positioning means to place the electron beam at a home position outside the phosphor area during an idle period of the electron beam and for maintaining the electron beam in said home position during said idle period.
Claim 3
Dependent Claim
20 words
The system of claim 1 wherein said home position is located at a horizontal center outside of the phosphor area.
Claim 4
Dependent Claim
37 words
The system of claim 1 wherein said home positioning means further comprises: means for forcing said vertical deflection control data to a predetermined value; and means for holding said horizontal deflection control data at a predetermined value.
Claim 5
Dependent Claim
44 words
The system of claim 3 wherein said means for forcing said vertical deflection control data to a predetermine value comprises: means for disabling an output of said vertical positioning control data onto a bus; and means for forcing said bus to said predetermined value.
Claim 6
Dependent Claim
32 words
The system of claim 3 wherein said means for holding said horizontal deflection control data at a predetermined value comprises means for interrupting a counter that produces said horizontal deflection control data.
Claim 7
Dependent Claim
57 words
The system of claim 1 wherein said home positioning means places said electron beam at said home position by interrupting a retrace of said electron beam and further wherein a new deflection cycle will start by completing said retrace, whereby dynamic deflection errors caused by inconsistent initial conditions at the start of a horizontal trace are eliminated.
Claim 8
Dependent Claim
163 words
A deflection system for a cathode ray tube having an electron beam for illuminating a phosphor area on the face of the cathode ray tube and having a fiber optic faceplate for conducting light from said phosphor area to a viewing area beyond said phosphor area, said system comprising: vertical positioning means for producing vertical deflection control data for positioning the electron beam at one of a plurality of predefined vertical positions; horizontal positioning means for producing horizontal deflection control data for sweeping the electron beam from a left side position on the fiber optic faceplate of the CRT to a right side position on the fiber optic faceplate of the CRT; and home positioning means for controlling said vertical positioning means and said horizontal positioning means to place the electron beam at a home position outside the fiber optic faceplate during an idle period of the electron beam and for maintaining the electron beam in said home position during said idle period.
Claim 9
Dependent Claim
163 words
A deflection system for a cathode ray tube having an electron beam for illuminating a phosphor area on the face of the cathode ray tube and having a fiber optic faceplate for conducting light from said phosphor area to a viewing area beyond said phosphor area, said system comprising: vertical positioning means for producing vertical deflection control data for positioning the electron beam at one of a plurality of predefined vertical positions; horizontal positioning means for producing horizontal deflection control data for sweeping the electron beam from a left side position on the fiber optic faceplate of the CRT to a right side position on the fiber optic faceplate of the CRT; and home positioning means for controlling said vertical positioning means and said horizontal positioning means to place the electron beam at a home position outside the fiber optic faceplate during an idle period of the electron beam and for maintaining the electron beam in said home position during said idle period.
Claim 10
Dependent Claim
37 words
The system of claim 7 wherein said home positioning means further comprises: means for forcing said vertical deflection control data to a predetermined value; and means for holding said horizontal deflection control data at a predetermined value.
Claim 11
Dependent Claim
44 words
The system of claim 8 wherein said means for forcing said vertical deflection control data to a predetermine value comprises: means for disabling an output of said vertical positioning control data onto a bus; and means for forcing said bus to said predetermined value.
Claim 12
Dependent Claim
32 words
The system of claim 8 wherein said means for holding said horizontal deflection control data at a predetermined value comprises means for interrupting a counter that produces said horizontal deflection control data.
Claim 13
Dependent Claim
57 words
The system of claim 7 wherein said home positioning means places said electron beam at said home position by interrupting a retrace of said electron beam and further wherein a new deflection cycle will start by completing said retrace, whereby dynamic deflection errors caused by inconsistent initial conditions at the start of a horizontal trace are eliminated.
Claim 14
Dependent Claim
119 words
A deflection method for a cathode ray tube having an electron beam for illuminating a phosphor area on the face of the cathode ray tube, said method comprising the steps of: (a) producing vertical deflection control data for positioning the electron beam at one of a plurality of predefined vertical positions; (b) producing horizontal deflection control data for sweeping the electron beam from a left side position on the face of the CRT to a right side position on the face of the CRT; (c) placing the electron beam at a home position outside the phosphor area during an idle period of the electron beam; and (d) maintaining the electron beam in said home position during said idle period.
Claim 15
Dependent Claim
119 words
A deflection method for a cathode ray tube having an electron beam for illuminating a phosphor area on the face of the cathode ray tube, said method comprising the steps of: (a) producing vertical deflection control data for positioning the electron beam at one of a plurality of predefined vertical positions; (b) producing horizontal deflection control data for sweeping the electron beam from a left side position on the face of the CRT to a right side position on the face of the CRT; (c) placing the electron beam at a home position outside the phosphor area during an idle period of the electron beam; and (d) maintaining the electron beam in said home position during said idle period.
Claim 16
Dependent Claim
29 words
The method of claim 12 wherein step (c) further comprises the step of defining said home position to be located at a horizontal center outside of the phosphor area.
Claim 17
Dependent Claim
38 words
The method of claim 12 wherein steps (c) and (d) further comprise the steps of: (c1) forcing said vertical deflection control data to a predetermined value; and (d1) holding said horizontal deflection control data at a predetermined value.
Claim 18
Dependent Claim
41 words
The method of claim 14 wherein step (cl) further comprise the disabling an output of said vertical positioning control (c1a) disabling an output of said vertical positioning control data onto a bus; and (c1b) forcing said bus to said predetermined value.
Claim 19
Dependent Claim
23 words
The method of claim 14 wherein step (dl) further comprises the step of interrupting a counter that produces said horizontal deflection control data.
Claim 20
Dependent Claim
56 words
The method of claim 12 wherein step (c) further comprises the step of placing said electron beam at said home position by interrupting a retrace of said electron beam at a position near a midpoint of said retrace, whereby dynamic deflection errors caused by inconsistent initial conditions at the start of a horizontal trace are eliminated.
References Cited (Backward Citations)
US3860753A
Cited
US3739224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-27 | 1995-07-29 | 1996-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-27 | 1999-07-29 | 2000-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-27 | 2003-07-29 | 2004-01-28 | $7700.00 | Window Closed / Lapsed |