Convergence device for color television receiver
First Claim
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1. A convergence device for a color television receiver capable of enlarging part of a picture focused on a screen, comprising:
- a first horizontal dynamic convergence circuit adapted to effect the convergence adjustment with parabolic current, anda second horizontal dynamic convergence circuit adapted to effect the convergence adjustment with part of a sinusoidal current, whereby convergence coil means through which convergence current flows when part of a picture is enlarged are connected through switch means to said second horizontal dynamic convergence circuit.
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Abstract
Disclosed are a convergence device consisting of a circuit for generating a signal in synchronism with the horizontal sync signal and a circuit for generating a sinusoidal waveform current in response to the output signal from the signal generating circuit so that part of the sinusoidal waveform current may be used as a convergence correction or adjustment current, and a color television receiver incorporating the convergence device of the type described and capable of enlarging part of a picture.
25 Citations
10 Claims
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1. A convergence device for a color television receiver capable of enlarging part of a picture focused on a screen, comprising:
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a first horizontal dynamic convergence circuit adapted to effect the convergence adjustment with parabolic current, and a second horizontal dynamic convergence circuit adapted to effect the convergence adjustment with part of a sinusoidal current, whereby convergence coil means through which convergence current flows when part of a picture is enlarged are connected through switch means to said second horizontal dynamic convergence circuit. - View Dependent Claims (2, 3)
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4. A convergence device for a color television receiver capable of enlarging part of a color television picture generated by electron beams focused on a screen, comprising:
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a first horizontal dynamic convergence circuit utilizing a parabolic current waveform to control the convergence of said electron beams; a second horizontal dynamic convergence circuit utilizing a sinusoidal current waveform to control the convergence of said electron beams; a common convergence coil means for applying a time-varying convergence magnetic field to said electron beams; and switching means for selectively connecting said convergence coil means to (i) said first horizontal dynamic convergence circuit when said picture is not enlarged, and (ii) said second horizontal dynamic convergence circuit when part of said picture is enlarged. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification