Tuners – Combined diverse-type tuners
Reexamination Certificate
2008-10-24
2010-12-14
Lee, Benny (Department: 2817)
Tuners
Combined diverse-type tuners
C334S015000, C348S731000, C455S180400, C455S191200, C455S302000
Reexamination Certificate
active
07852177
ABSTRACT:
In a double-tuning circuit including a primary tuning circuit having a first inductor and a first variable capacitive element connected in parallel and a secondary tuning circuit having a second inductor and a second variable capacitive element connected in parallel, a fixed part of a copper-foil pattern is connected to a connection point at which the double-tuning circuit is connected to an input terminal of a frequency mixing circuit, and a tip part of the copper-foil pattern extends to near the first inductor, whereby a trap circuit for attenuating an image frequency component is formed. A pattern is formed between a ground-side terminal of the first inductor and the ground, and a capacitor is connected between a connection point at which the first inductor is connected to one terminal of the pattern and a ground-side terminal of the second variable capacitive element.
REFERENCES:
patent: 5285179 (1994-02-01), Wignot et al.
patent: 6950152 (2005-09-01), Yamamoto
patent: 0 584 732 (1994-03-01), None
patent: 1 931 028 (2008-06-01), None
patent: 5-235703 (1993-09-01), None
patent: 3108713 (2005-02-01), None
patent: 00/11783 (2000-03-01), None
European Search Report dated Mar. 24, 2009 from European Application No. 08021919.9.
ALPS Electric Co. Ltd.
Beyer Law Group LLP
Lee Benny
LandOfFree
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