Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Reexamination Certificate
2006-09-05
2006-09-05
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
C315S382000
Reexamination Certificate
active
07102302
ABSTRACT:
A parabola generator for providing dynamic correction includes a capacitor source of a parabolic input signal at a frequency related to a horizontal deflection frequency coupled to a first terminal of the capacitor. A diode switch is coupled to a voltage at a reference level and to a second terminal of the capacitor for periodically clamping a peak level of a signal developed at the second terminal. A transistor switch is responsive to a periodic switch control signal and coupled to the second terminal of the capacitor for periodically clamping a signal applied from the second terminal, during retrace, for removing a parasitic parabolic voltage portion to generate a dynamic correction signal. The dynamic correction signal is coupled to the cathode ray tube to vary a field in a beam path of an electron beam of the cathode ray tube for providing dynamic correction.
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Copy of Search Report Dated Jun. 20, 2003.
Fried Harvey D.
Johnson Christine
Laks Joseph J.
Thomson Licensing
Tran Thuy Vinh
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