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| Crystal Blank |
|
Crystal Blank Crystal Oscillator |
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Cutting
and
Measuring
cutting angle |
A synthetically grown quartz
bar is lumbered into thin quartz
wafers
according to the specified
cutting angle, which has direct
relationship to the frequency vs.
temperature characteristic. |
|
Base Plating |
The electrode, used for applying
an electric field to the crystal
blank,
is formed by vacuum metal
deposition using silver on
the top of the crystal blank. |
|
Dimensioning
the
blank |
Depending on the oscillator
package, the blank is rounded or
cut into rectangular shape. |
|
Mounting
crystal
blank into
substrate |
The crystal blank is mounted on
supporting springs with silver
paste making electrical contact to
the electrodes on each side of the
blank. |
|
| Lapping |
Lapping machine grind the wafer
surfaces using abrasives while
maintaining flatness.
The thinner the blank, the higher
the frequency. |
|
Final Plating |
The frequency of each oscillator
is measured while silver is
evaporated onto one side of an
exposed electrode until the target
frequency is reached. |
|
| Beveling |
To cause vibrations to occur
at the center, the crystal piece is
shaped into the form of lens. |
|
Sealing by
Resistance
Welding |
The inside of a oscillator is
evacuated and filled with the inert
Nitrogen gas to prevent electrodes
from being oxidized or influenced
by ambient temperature. |
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Etching and
Cleaning |
The quartz blanks are etched in
a solution to improve the surfaces
finish and reduce the spread in
frequency of the production batch. |
|
Aging and
Electrical test |
After aging at an elevated
temperature for a period of time,
the electrical specifications are
tested. |
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