Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1986-04-15
1987-10-13
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 8, 315397, H01J 2970, H01J 2972
Patent
active
047001143
ABSTRACT:
A vertical deflection amplifier of a video display apparatus includes first and second transistor amplifier output stages arranged in a totem-pole, push-pull configuration. A vertical deflection winding is coupled to the output stages at a deflection amplifier output terminal. An S-capacitor is coupled to the deflection winding at a second terminal remote from the output terminal. A source of deflection rate signals is coupled to the deflection amplifier for generating a deflection current in the deflection winding. A base current generating circuit is coupled to one of the transistor amplifier output stages for providing base current thereto. The S-capacitor voltage is applied to the base current generating circuit for enabling conduction of base current in the one amplifier output stage. When the video display apparatus is first turned on, the initially discharged S-capacitor is slowly charged from a DC voltage supply to delay generation of vertical deflection past completion of picture tube degaussing.
REFERENCES:
patent: 3727096 (1973-04-01), Wilcox
patent: 3735192 (1973-05-01), Avery
patent: 4052645 (1977-10-01), Fujita
patent: 4096416 (1978-06-01), Henley
patent: 4147963 (1979-04-01), Shiotani
patent: 4289994 (1981-09-01), Beaumont et al.
patent: 4535270 (1985-08-01), Frantz et al.
Report MRZ-305, "Resonant Degaussing Circuit", by P. Haferl, Laboratories RCA Ltd., Zurich, Switzerland, dated Mar. 1986.
U.S. patent application, Ser. No. 853,421, P. E. Haferl, entitled "Resonant Degaussing Apparatus", filed Apr. 18, 1986.
Training Manual WC 21, CTC 108 Television Workshop, Servicing the CTC 108 XL-100 Color Chassis, published by RCA Corporation Consumer Electronics, dated 1980, pp. 42-47 inclusive.
RCA Television Service Data, Chassis CTC 108 Series, published by RCA Corporation Consumer Electronics, dated 1981, pp. 11 and 24-28 inclusive.
Blum Theodore M.
Laks Joseph J.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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