Chip-type piezoelectric-resonator and method of manufacturing the same
First Claim
1. A chip-type piezoelectric-resonator comprising:
- a piezoelectric resonance element including a piezoelectric substrate, vibrating electrodes that are opposite to each other through said piezoelectric substrate, and terminal electrodes that are connected with said vibrating electrodes, respectively;
peripheral walls of adhesive layers provided on respective major surfaces of said piezoelectric substrate so as to enclose a vibrating region of said piezoelectric resonance element;
cover sheets having outer and inner major surfaces, said inner major surfaces being arranged on respective said adhesive layers for defining cavities between the cover sheets and said vibrating region, each said cavity having a periphery and a thickness corresponding to a thickness of said respective adhesive layers thereby providing spaces for vibration of said vibrating region; and
protective resin members in contact with and extending into a space defined between said cover sheets and said major surfaces of said piezoelectric substrate outside said adhesive layers and along the entire periphery of each said cavity, said protective resin members thereby sealing said cavities.
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Abstract
In order to regularly properly define cavities for vibrating spaces in a chip-type piezoelectric-resonator which is protected with resin to be capable of surface mounting, a mother substrate comprising a piezoelectric substrate, a plurality of piezoelectric resonance elements formed thereon is prepared and bank-shaped adhesive layers are formed on respective major surfaces of the mother substrate to enclose the vibrating region, and mother sheets provided with plural cover sheets are arranged to cover both major surfaces of the mother substrate, thereby defining cavities for vibrating spaces. Then, protective resin members are applied to cover both major surfaces of the mother substrate, which in turn is divided to obtain a plurality of chip-type piezoelectric-resonators.
28 Citations
17 Claims
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1. A chip-type piezoelectric-resonator comprising:
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a piezoelectric resonance element including a piezoelectric substrate, vibrating electrodes that are opposite to each other through said piezoelectric substrate, and terminal electrodes that are connected with said vibrating electrodes, respectively; peripheral walls of adhesive layers provided on respective major surfaces of said piezoelectric substrate so as to enclose a vibrating region of said piezoelectric resonance element; cover sheets having outer and inner major surfaces, said inner major surfaces being arranged on respective said adhesive layers for defining cavities between the cover sheets and said vibrating region, each said cavity having a periphery and a thickness corresponding to a thickness of said respective adhesive layers thereby providing spaces for vibration of said vibrating region; and protective resin members in contact with and extending into a space defined between said cover sheets and said major surfaces of said piezoelectric substrate outside said adhesive layers and along the entire periphery of each said cavity, said protective resin members thereby sealing said cavities. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification