Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1994-12-15
1996-08-27
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315396, 315408, G09G 104, H01J 2970
Patent
active
055504426
ABSTRACT:
A horizontal deflection circuit is provided which is useful in a television receiver and a video apparatus using a cathode ray tube, and which generates a deflection current for horizontally deflecting electron beams by changing a magnetic field applied to the cathode ray tube, and in which a resonance circuit using LC parts is not employed, and the vertical line distortion correction and the control of the horizontal deflection current in the multiscan are conducted by changing the duty ratios of switch elements, thereby simplifying the circuit configuration, and reducing the cost and the loss. [CONSTRUCTION] The horizontal deflection circuit has: a series circuit of first and second switch means and connected to positive and negative terminals of a DC power source; a series circuit of a horizontal deflection coil and a first capacitor and connected across the first switch means; control means for controlling closing and opening operations of the first and second switch means; and first and second diodes respectively connected across the first and second switch means. The control means controls the first and second switch means so that the first and second switch means are alternately closed and opened in synchronism with a horizontal synchronizing signal. The control means further controls the first and second switch means so that close and open periods of the first and second switch means are changed in synchronism with a vertical synchronizing signal. Accordingly, a horizontal deflection circuit which is simplified in configuration, minituarized, and reduced in cost and loss is obtained.
REFERENCES:
patent: 4206388 (1980-06-01), Ishigaki et al.
patent: 5285133 (1994-02-01), Ogura
Nagagata Nobuyoshi
Ueyama Toshinari
Issing Gregory C.
Matsushita Electric - Industrial Co., Ltd.
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