The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 02, 1989
Filed:
May. 05, 1987
Kiyoshi Watanuki, Yokohama, JP;
Yoichi Nakamura, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A terminal of the vertical deflection coil is connected to an integrating circuit, which generates a saw-tooth signal from the vertical deflection current for vertical synchronization. The saw-tooth signal is supplied to the clipping circuit having a diode so as to clip its waveform. The clipped signal and said parabolic signal are summed by an adding means in order to generate a correction signal. The correction signal is amplified with an amplifying transistors and supplied to the primary winding of the transformer, the secondary winding of which is serially connected to the horizontal deflection coil. The waveform of the signal that is summed up, is similar to the form of the pin cushion distortion indicated on the raster of a non-spherical CRT. Therefore, the correction singal modulates the amplitude of a current flowing through the horizontal deflection coil, so that the pin cushion distortion can be corrected on the luster.