| 摘要 |
PROBLEM TO BE SOLVED: To make a mount face flat in a laminated type piezoelectric filter that is made thin, where a resonator is electrically and mechanically protected and manufacture and assembling are facilitated. SOLUTION: A plurality of resonators are respectively surrounded by frame spacers 2a, 2b, 2c and laminated via intermediate printed circuit boards 3a, 3b. A top printed circuit board 4 is formed to an uppermost position and a bottom printed circuit board 5, whose lower face is formed with a plurality of connection electrodes, is placed to lowermost position, each frame spacer, the top printed circuit board, the bottom printed circuit board are adhered by each adhesion sheet 6, a conductive pattern formed to each printed circuit board is connected to electrodes of each resonator, and the conductive pattern is connected to one of connection electrodes via conductive slots 11L, 11R, 11B formed to edges of the printed circuit boards 3a, 3b, 4, 5 to configure the filter circuit.
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