Electronic part and electronic equipment with electronic part

Details Electronic part and electronic equipment with electronic part Electronic part and electronic equipment with electronic part

2008-12-12

2010-12-21

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C310S31300R, C310S31300R, C333S195000

Reexamination Certificate

active

07855619

ABSTRACT:
An electronic part, an object of which is to improve temperature characteristics and electrical properties, includes a substrate (1), a comb-type electrode (2) that is disposed on the upper surface of the substrate (1), and a protective film (4) that covers the comb-type electrode (2) and has an uneven shape at its top surface. If the pitch width of one pitch in the uneven shape of the protective film (4) is L, the width of one pitch of a convex portion (4a) of the unevenness in the uneven shape of the protective film (4) is L1, the width of one pitch of a concave portion (4b) thereof is L2, the pitch width of one pitch of the comb-type electrode (2) is p, the width of one of electrode fingers which form the comb-type electrode (2) is p1and the width between the electrode fingers is p2, then each parameter is set so that the following expressions are satisfied, L1≦p1and L2≧p2(herein, the correlations of L≈p, p1+p2=p and L1+L2=L are satisfied).

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Supplementary European Search Report issued Mar. 26, 2008 in European Application No. EP 03 78 2874.
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Result of Consultation issued by the European Patent Office on May 4, 2010 in European Application No. 03 782 874.6, which is a foreign counterpart of the present patent application.

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