Synthetic Quartz Crystals
Quartz Crystals
Natural quartz crystals have been used in wireless communication devices, such as crystal oscillators and transmitters, but the demand for high-precision quartz crystals led to the creation of synthetic quartz crystals with fewer impurities.
Natural Quartz Crystal
- ・Many impurities and defects
- ・Variation in shape and size
In mines where raw materials are mined, colored crystals are also collected and sold for decoration.
Natural crystal for the production of synthetic quartz crystal is carefully selected and transported by local workers who check for clarity.
Synthetic Quartz Crystal
- ・Less impurities and defects
- ・Uniform crystal direction
- ・Controllable shape and size
Synthetic quartz crystals, which have piezoelectric, birefringent, and polarizing properties, are used in a variety of electronic and optical devices.
Main Lineup of Synthetic Quartz Crystals
| Use | Type | As-grown maximum size | Seed crystal direction | Inclusion density (JIS grade) |
Etch channel density (JIS grade) | α-value (JIS grade) | ||
| Seed Xs (mm) | Z (mm) | Seed Ys (mm) | ||||||
| Oscillator | Z | 80 | 55 | 230 | 1°00'~ 3°30' | Ⅰ | Ⅰ a | C |
| Z | 104 | 55 | 260 | 1°00'~ 3°30' | Ⅰ | 1 | C | |
| SAW | Z | 104 | 110 | 250~280 | 0° | Ⅱ | 1 | C |
| Optics | Z | 104 | 30~35 | 250 | 0° | Ⅰ a | 2 | - |
| Z | 70 | 30~45 | 180~200 | 0° | Ⅰ a | 1 | - | |
| X | 35 | 90 | 250 | 0° | Ⅰ a | 2 | - | |
JIS Grade Standard
| Inclusion density | Grade | Ⅰa | Ⅰb | Ⅰ | Ⅱ | Ⅲ | - | - | ||
| pcs/c㎥ | 100μm or more | 0 | 1 | 2 | 3 | 4 | - | - | ||
| 70~100μm | 0 | 1 | 2 | 4 | 6 | - | - | |||
| 30~70μm | 1 | 2 | 4 | 5 | 8 | - | - | |||
| 10~30μm | 2 | 3 | 6 | 9 | 12 | - | - | |||
| Etch channel density | Grade | 1aa | 1a | 1 | 2 | 3 | 4 | 5 | ||
| pcs/cm2 | 2 | 5 | 10 | 30 | 100 | 300 | 600 | |||
| α-value | Grade | Aa | A | B | C | D | E | - | ||
| α3585 | 0.015 | 0.024 | 0.050 | 0.068 | 0.100 | 0.140 | - | |||
Low-Cost Mass Growth Using the World's Largest Pressure Vessel (Autoclave)
Our unique growth technique, which can produce 2,000-2,500 kg of synthetic quartz crystals at a time with a high yield and low variation in quality, enables us to produce high quality crystals at low cost.
Low Impurity Growth Using Ultra-High Purity Raw Materials, etc.
The low impurity quartz crystals are grown by controlling the raw materials to meet our own standards of purity and grain size, thoroughly controlling the cleaning autoclaves and various growing components, and other controls.
Low Etch Channel Density Growth with High Quality Seeds
Our unique growth technology with high quality seed crystals enables low etch channel density growth. In addition, the quality of the seed crystals is not only improved, but also thoroughly controlled for quality maintenance, as the dislocations and etch channel density will increase with repeated duplication of the seed crystals.
High Q value and Low Density Inclusion Growth Using Our Unique Technology
The quality and cost of synthetic quartz crystals are basically in a trade-off relationship. We are developing our own unique technologies to reduce costs while maintaining high quality levels to further improve our competitive edge.
Skilled Maintenance of Pressure Vessels to Maintain High Pressure Conditions During Crystal
Growth.
We have inherited the pressure vessel maintenance technology from one of our group companies, Japan Steel Works M&E, Inc., and have continued to improve this technology, supporting the growth of synthetic quartz crystals with our advanced technologies.
