Ladder-type piezoelectric filter with lid providing predetermine

Details Ladder-type piezoelectric filter with lid providing predetermine Ladder-type piezoelectric filter with lid providing predetermine

1999-04-05

2000-05-09

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310348, 29 2535, H03H 958, H03H 910, H03H 302

Patent

active

06060963&

ABSTRACT:
An input terminal and a first output terminal having lead portions are juxtaposed at the bottom of the case of a ladder-type piezoelectric filter, and substantially rectangular series resonators adapted to vibrate in a longitudinal vibration mode are disposed on the input terminal and the first output terminal. A connection terminal having no lead portion is placed on the series resonators, and one parallel resonator is placed on the connection terminal. Subsequently, a ground terminal having a lead portion is placed on the parallel resonator. Subsequently, the other parallel resonator is placed on the ground terminal, and a second output terminal having a lead portion is placed on the parallel resonator. The lead portions of the terminals are fitted into grooves that are formed on the inner surface of the case and extend in the depth direction, so that the lead portions are positioned. A lid is fitted into the opening portion of the case and welded to the inner surface of the opening portion in a state in which the components accommodated in the case are pressed in the thickness direction. Resin is disposed into a concave space formed between the lid and the opening portion of the case.

REFERENCES:
patent: 4353045 (1982-10-01), Matsui et al.
patent: 4532451 (1985-07-01), Inoue
patent: 4656385 (1987-04-01), Tanaka
patent: 5543763 (1996-08-01), Oyama
patent: 5565824 (1996-10-01), Nagano
patent: 5598133 (1997-01-01), Fuse
patent: 5705880 (1998-01-01), Shimura et al.

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