Surface acoustic wave device, method for manufacturing, and electronic circuit device
First Claim
1. A surface acoustic wave device comprising:
- a piezoelectric substrate,a comb-like electrode provided on a main surface of said piezoelectric substrate,a space formation member provided on said comb-like electrode portion,a plurality of bump electrodes provided on said main surface of said piezoelectric substrate, anda plurality of terminal electrodes coupled to said plurality of bump electrodes, respectivelythe piezoelectric substrate and the terminal electrodes are resin-sealed to form a sealed body, wherein a main face of each of said terminal electrodes are exposed and a side face of each of the terminal electrodes is flush with one of a plurality of side surfaces of the sealed body.
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Accused Products
Abstract
A surface acoustic wave device which occupies a small mounting area and has a low profile, yet having an improved reliability, and can be made available at low cost. The surface acoustic wave device comprises a piezoelectric substrate, a function region formed of comb-like electrodes for exciting surface acoustic wave provided on a main surface of the piezoelectric substrate, a space formation member covering the function region, a plurality of bump electrodes provided on a main surface of the piezoelectric substrate and a terminal electrode provided opposed to the main surface of piezoelectric substrate. The bump electrode and the terminal electrode are having a direct electrical connection, and a space between piezoelectric substrate and terminal electrode is filled with resin. When the above-configured acoustic wave device is applied for a frequency filter, a resonator, in a portable telephone unit, a keyless entry or the like communication apparatus, the overall size of such apparatus can be reduced and a higher reliability is implemented.
43 Citations
23 Claims
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1. A surface acoustic wave device comprising:
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a piezoelectric substrate, a comb-like electrode provided on a main surface of said piezoelectric substrate, a space formation member provided on said comb-like electrode portion, a plurality of bump electrodes provided on said main surface of said piezoelectric substrate, and a plurality of terminal electrodes coupled to said plurality of bump electrodes, respectively the piezoelectric substrate and the terminal electrodes are resin-sealed to form a sealed body, wherein a main face of each of said terminal electrodes are exposed and a side face of each of the terminal electrodes is flush with one of a plurality of side surfaces of the sealed body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An electronic circuit device comprising:
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a surface acoustic wave device including piezoelectric substrate, a comb-like electrode provided on a main surface of said piezoelectric substrate, a wall surrounding said comb-like electrode portion, a plurality of bump electrodes provided on said main surface of said piezoelectric substrate, and a plurality of terminal electrodes coupled to said plurality of bump electrodes, respectively, wherein the piezoelectric substrate and the terminal electrodes are resin-sealed to form a sealed body, wherein a main face of each of said terminal electrodes are exposed and a side face of each of the terminal electrodes is flush with one of a plurality of side surfaces of the sealed body; and a circuit board provided with a wiring conductor line, wherein said surface acoustic wave device is mounted on said circuit board and the terminal electrodes of said surface acoustic wave device are connected with said wiring conductor line. - View Dependent Claims (22, 23)
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Specification