EP0062529A2
Expired / Lapsed
EP
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Delay compensation in electromagnetic deflection systems
Assignee: Tektronix Inc
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Filing: 1982-04-05
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Granted: —
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Expires: 2002-04-05
Abstract
Abstract An electromagnetic deflection circuit is disclosed. The deflection circuit includes a plurality of loss elements. These loss elements are responsible for the production of an inherent time delay ( t D) between the energization of the circuit by an input signal (x, y) and the generation of a magnetic flux ( B d) used to deflect an electron beam within a cathode-ray tube (22). According to an exemplified embodiment of the invention, a DC level shift signal generator (32, Fig. 6), a beam position input signal generator (24, Fig. 6), and an adder (10) for adding the DC level shift signal to the beam position input signal produce an input signal that energizes the correction deflection circuit (14). The introduction of the DC level to the beam position input signal effectively advances, in time, the output signal from the convergence correction signal generator. This advance compensates for the various time delays present in the deflection circuit.
Inventors
- 👤 Clayton Charles Wahlquist
- 👤 Harold Wayne Olmstead
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 12:57
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/28; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/233; H04N3/2335
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
An electron beam deflection circuit for a cathode ray tube, the circuit including a deflection coil and a signal generator coupled to the coil, the generator providing an ' output signal derived from a beam position-related input signal, characterized by the addition to the input signal of a further signal to effect a time advance of the output signal sufficient to substantially cancel time delays inherent in the deflection circuit.
Claim 2
Dependent Claim
70 words
An electron beam deflection circuit for a cathode ray tube, the circuit including a deflection coil and a signal generator coupled to the coil, the generator providing an ' output signal derived from a beam position-related input signal, characterized by the addition to the input signal of a further signal to effect a time advance of the output signal sufficient to substantially cancel time delays inherent in the deflection circuit.
Claim 3
Dependent Claim
22 words
The circuit of claim 1, wherein said beam position-related signal is a ramp signal, and said further signal is a d.c. potential.
Claim 4
Dependent Claim
188 words
An electromagnetic deflection circuit for deflecting an electron beam being generated in the neck of a cathode ray tube, said deflection circuit having inherent time delays inclusive therein due to a plurality of loss elements in said deflection circuit, comprising: means for developing an input signal, said input signal energizing said electromagnetic deflection circuit, the means for developing an input signal including, means for generating a beam position input signal, means for generating a shift signal representative of a DC level increment; and adder means responsive to said beam position input signal and to said shift signal for adding said shift signal to said beam position input signal thereby introducing said DC level increment into said beam position input signal and producing said input signal in response thereto; and means responsive to said input signal for developing a magnetic field, said magnetic field deflecting said electron beam being generated in the neck of said cathode ray tube; whereby the introduction of said DC level increment into said beam position input signal compensates for the inherent time delays produced by the plurality of loss elements in said deflection circuit.
Claim 5
Dependent Claim
188 words
An electromagnetic deflection circuit for deflecting an electron beam being generated in the neck of a cathode ray tube, said deflection circuit having inherent time delays inclusive therein due to a plurality of loss elements in said deflection circuit, comprising: means for developing an input signal, said input signal energizing said electromagnetic deflection circuit, the means for developing an input signal including, means for generating a beam position input signal, means for generating a shift signal representative of a DC level increment; and adder means responsive to said beam position input signal and to said shift signal for adding said shift signal to said beam position input signal thereby introducing said DC level increment into said beam position input signal and producing said input signal in response thereto; and means responsive to said input signal for developing a magnetic field, said magnetic field deflecting said electron beam being generated in the neck of said cathode ray tube; whereby the introduction of said DC level increment into said beam position input signal compensates for the inherent time delays produced by the plurality of loss elements in said deflection circuit.
Claim 6
Dependent Claim
80 words
An electromagnetic deflection circuit in accordance with claim 3 wherein three electron beams are generated in the neck of said CRT tube; and wherein the means for developing a magnetic field comprises: correction signal generating means responsive to said input signal for generating a correction signal representative of the amount of correction needed to converge said three electron beams, said correction signal being advanced along the time axis in response to said shift signal representative of said DC level increment.
Claim 7
Dependent Claim
61 words
An electromagnetic deflection circuit in accordance with claim 4 wherein the means for developing further comprises; means responsive to said correction signal for amplifying said signal; and deflection means responsive to the amplified correction signal for generating a magnetic field, said magnetic field deflecting at least one of the electron beams being generated in the neck of said cathode ray tube.
Claim 8
Dependent Claim
66 words
An electromagnetic deflection circuit in accordance with claim 5 wherein the means for amplifying comprises an operational amplifier, one input terminal being connected to a ground potential, another input terminal. being responsive to said correction signal, said another input terminal being connected to a resistor-capacitor parallel combination, the output terminal of said operational amplifier and said another input terminal being connected together via a feedback resistor.
References Cited (Backward Citations)
No citation records indexed.
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