HORIZONTAL SIZE CORRECTING CIRCUIT

PROBLEM TO BE SOLVED: To provide a horizontal size correcting circuit by which change due to high voltage change is restricted in a horizontal size while utilizing a picture tube which does not require a pin cushion correcting circuit and a diode modulator circuit. SOLUTION: An operation amplifier O...

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Bibliographic Details
Main Author YAMAGA HIROSHI
Format Patent
LanguageEnglish
Published 03.10.2003
Edition7
Subjects
ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
CRYPTOGRAPHY
DISPLAY
EDUCATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
SEALS
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Summary:PROBLEM TO BE SOLVED: To provide a horizontal size correcting circuit by which change due to high voltage change is restricted in a horizontal size while utilizing a picture tube which does not require a pin cushion correcting circuit and a diode modulator circuit. SOLUTION: An operation amplifier OP adopts partial pressure by resistances R21 and R22 as an input voltage, and generates an output current corresponding to the input voltage. The output current is supplied to one end at the primary side of a correction coil L. When a screen is bright, an anode current is increased in the picture tube, so that a high voltage is lowered. The high voltage lowering is recognized by the reduction of an input voltage in the OP, a current flowing to the primary side of the correction coil L is decreased in response to the reduction, and impedance at the secondary side of the correction coil L is increased. Thus, a resonance frequency with an S shape correction capacitor C2 is reduced, and, then, a correction is performed to reduce the horizontal size. COPYRIGHT: (C)2004,JPO
Bibliography:Application Number: JP20020087456