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:
Sep. 01, 1987
Filed:
Jun. 05, 1986
Applicant:
Inventor:
Shigeru Kashiwagi, Iwai, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315371 ;
Abstract
In a horizontal pincushion distortion correcting circuit using a parabolic wave signal of vertical deflection period for use with CRT drive circuit, a d.c. voltage proportional to vertical deflection period is produced, and then the parabolic wave signal is amplitude-modulated by the d.c. voltage so that a resultant parabolic wave signal has a substantially constant amplitude irrespective of the change in vertical sync frequency. The d.c. voltage may be produced by frequency-converting the vertical sync signal or by detecting an envelope of the horizontal deflection current modulated by the resultant parabolic wave signal.