Tuner for television receiver

Details Tuner for television receiver Tuner for television receiver

H - Electricity

03

J

365/9

H03J 5/24 (2006.01) H03J 5/02 (2006.01) H04B 1/08 (2006.01)

Patent

CA 1238433

ABSTRACT OF THE DISCLOSURE A tuner for television receiver is disclosed, which includes a common shielding case, an electronic tuning tuner section having tuning circuits formed by using a vari-cap diode, a plurality of oscillators corresponding to the different receiving bands or the electronic tuning tuner section and receiving a desired frequency by switching a plurality of bands, a PLL (phase locked loop) system channel selection circuit section for supplying a predetermined tuning voltage to the tuning circuits, the electronic tuning tuner section and the PLL system channel selection circuit section both being incorporated in the common shielding case, the plurality of local oscillators and the PLL system channel selection circuit section being located within the common shielding case at its one end portion and substantially on one straight line, external connection terminals aligned on one side plane of the common shielding case for setting the electronic tuning tuner section and the PLL system channel selection circuit section in a desired condition, a shielding plate located within the common shielding case in the direction substantially perpendicular to the arranging line of the external connection terminals and bent at its predetermined portion so as to surround the PLL system channel selection circuit section, a high frequency input terminal and an intermediate frequency output terminal located to the side of the electronic tuning tuner section with respect to the connection point of the shielding plate to the shielding case and a terminal for a channel selection control digital signal located to the side of the PLL system channel selection circuit section with respect to the above connection point.

497468

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