Piezoelectric resonator, method of manufacturing...

Wave transmission lines and networks – Plural channel systems – Having branched circuits

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C333S187000, C333S189000, C029S025350

Reexamination Certificate

active

07113055

ABSTRACT:
A piezoeletric resonator includes: a substrate; a lower electrode formed on or above the substrate; a piezoeletric body formed on or above the lower electrode; an upper electrode formed on or above the piezoeletric body; and a cavity under a vibrating portion formed by the lower electrode, the piezoeletric body, and the upper electrode. Where a resonant frequency of vibration with a thickness of the vibrating portion being a half of a wavelength is taken as fr, an average of ultrasonic velocity in a material forming the cavity is taken as Vc, and a value determined based on the resonant frequency fr and the average of ultrasonic velocity Vc is taken as λc (=Vc/fr), a depth of the cavity is set so as to be equal to or larger than n×λc/2−λc/8 and equal to or smaller than n×λc/2+λc/8.

REFERENCES:
patent: 6355498 (2002-03-01), Chan et al.
patent: 6377137 (2002-04-01), Ruby
patent: 6842088 (2005-01-01), Yamada et al.
patent: 2003/0088960 (2003-05-01), Seo et al.
patent: 60-68710 (1985-04-01), None
patent: 60-68711 (1985-04-01), None
patent: 2002-198758 (2002-07-01), None
patent: 2003-32060 (2003-01-01), None
Hiroyuki Nakamura et al., U.S. Appl. No. 10/979,276, filed Nov. 3, 2004.
Hiroshi Yamaguchi et al., U.S. Appl. No. 10/979,277, filed Nov. 3, 2004.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Piezoelectric resonator, method of manufacturing... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Piezoelectric resonator, method of manufacturing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Piezoelectric resonator, method of manufacturing... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3542002

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.