Apparatus for automatic lapping control
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 29, 1980
Issued Date -
N/A
app pub date -
Feb 9, 1979
filing date -
Jul 17, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for automatic lapping control, based on imbedding an electrode of special construction in a lapping plate of a lapping machine, including at least one piezoelectric wafer in the lapping load, sensing the resonance frequency of the piezoelectric wafers as they pass by the electrode, and automatically terminating the lapping when the resonance frequency equals or exceeds a target frequency; the special electrode construction comprising a facing of a dielectric material with a high dielectric constant and surrounded by an insulator having a low dielectric constant and an average wall thickness larger than its wall thickness at the surface of the lapping plate.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully