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Technology
100% Testing and Inspection
To ensure maximum lifetime in your process and stable and accurate rate control, each crystal is examined for:
Resistance-Resistance is checked to assure measurement stability and longer coating life. Resistance is an indicator of electrical contact and electrode adhesion.- Frequency-Starting frequency within a small specification range is verified to ensure accurate thickness measurement.
- Curvature-An electrical test for curvature is performed to assure resonance stability. Poor curvature results in measurement stability degrading more rapidly.
- Visual Conformity-Each crystal is inspected for electrode uniformity, surface flaws, and other imperfections that are indicators of poor electrode adhesion and contamination.
Right Crystal - Thickness Controller
JJK quartz monitor crystals meet all your requirements for reliability, availability and affordability. JJK monitoring crystals are produced 100% in house – from blank quartz crystals to the finished product-ensuring unparalleled quality no other company can guarantee.
Advantages
Plano-convex configuration suppresses unwanted modes for greater accuracy.AT-cut crystal orientation enhances
stability over a wide range of operating
temperatures.Improving of adhesion underlayer
from electrode-to-crystal assures the
crystals' reliability and long-life.Gold or silver electrode coating for
maximum electrode life.100% testing of each crystal'
s frequency and activity (series
resistance).Compatibility with all JJK sensor
heads and most other manufactures
instruments.Clean room processing to avoid
particulate contamination.
Delivering Just the Right Crystal
Available in 5 and 6 MHz with
gold, silver, or stress reducing alloy
electrodes, JJK quartz monitor
crystals are produced to stringent
specifications and carefully inspected
to assure high yields and optimum
reliability.Our AT-cut plano-convex design
reduces errors in deposition rate and
thickness by minimizing spurious
vibrational modes.We have abundant inventory to
meet both your immediate and long-
term requirements.We also offer the flexibility to
produce crystals to your specific sizes
and frequencies.
How to Choose the Right Crystal
Our continuing research into
quartz crystal characteristics results
in ongoing improvements to offer the
highest reliability in your process.We recommend gold crystals for
most applications.They have low
contact resistance, high chemical
stability. The gold electrodes crystals
are best suited for low stress material
coating monitoring, such as gold, silver,
copper film thickness control.Silver crystals will provide superior
performance in processes with high
heat loads, such as sputtering.They
may also improve the deposition of
oxides.Alloy crystals are recommended for
optical coating with dielectric materials
and for semiconductor processes with
high-stress materials，such as SiO,
SiO 2 , MgF 2 , TiO 2 and so on.