Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-03-10
1999-07-06
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310344, 310348, H01L 4108
Patent
active
059201428
ABSTRACT:
The present invention relates to an electronic part used for mobile communications apparatuses and the like, and more particularly to an electronic part, such as an acoustic surface-wave device, a piezoelectric ceramic device or the like, which requires an oscillation space near the surface of the functional device chip thereof, and a method of production thereof. With this method, a space retainer for forming a sealed space at the functional portion of the chip can be hermetically sealed and have high moisture resistance, and the process of forming the space retainer can be carried out easily.
The electronic part of the present invention comprises a functional device chip, a space retainer for forming a sealed space at the functional portion of the chip, a circuit substrate to which the chip is secured, electrode interconnection portions for establishing electric connection between the chip and the circuit substrate, and a sealing resin for covering and sealing at least the space retainer, wherein the space retainer comprises a support layer made of a synthetic resin film, provided with an opening enclosing the functional portion and joined onto the main surface, and a cover formed and joined onto the support layer so as to cover the functional portion and form a sealed space between the cover and the functional portion.
REFERENCES:
patent: 4047129 (1977-09-01), Ishiyama
patent: 4734608 (1988-03-01), Takoshima
patent: 5623236 (1997-04-01), Yoshinaga et al.
K. Onishi et al., "A 1.5 GHz-Band SAW Filter Using Flip-Chip-Bonding Technique", IEEE, 1993 Japan Int'l Manufacturing Technology Symposium, pp. 109-112.
European Search Report for Int'l Appln No. EP 97 10 3617 dated Apr. 16, 1998.
Bessho Yoshihiro
Eda Kazuo
Iwaki Hideki
Kawasaki Osamu
Onishi Keiji
Budd Mark O.
Matsushita Electric - Industrial Co., Ltd.
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