Crystal Device

Cutting Brittle Material

When a crystal unit is cut from artificial quartz rock, the characteristics obtained differ considerably according to the angle with respect to the crystallographic plane.
To achieve the angle and thickness targeted in order to obtain the crystal unit characteristics that match the customers’ requirements, we use wire-saw cutting technology with our own original tweaks.
Wire-saw cutting is a form of cutting in which abrasive grains are supplied between a very fine wire that reciprocates at high speed and the artificial quartz, so there is less cutting allowance than with a blade saw, and high productivity and cutting accuracy can be obtained.

• Cutting off

Polishing Brittle Material

By lapping and polishing wafers cut to high accuracy, we can give the outline shape and thickness an even higher level of accuracy. We achieve high cutting accuracy by adopting fixtures and tooling designed in-house and passing down the technology we have built up.
For lapping, we use a double-sided lapping technique that gives high productivity, and provide surfaces that meet the needs of our customers, from a #4,000 finish to a mirror finish by polishing.

• Lapping / Polishing Technology

Etching

This is a technology that cuts materials by using the corrosive effects of chemicals such as hydrofluoric acid.
It is an essential elemental technology for modifying the surface obtained by lapping, or successfully processing compact, high-accuracy crystal unit chips that are difficult to achieve by machining.

• Etching Details

Assembly

This is assembly to provide piezoelectric devices with external electrical conduction.
Assembly accuracy plays an important role affecting quality, and as part of this we make use of higher technology in our automated machines, using reflow, lasers and so on, to enable mass production with a small amount of equipment.
We also use various assembly methods depending on the product type, such as the adhesion method which improves the damper effect to stabilize oscillation.

Vacuum Sealing

Sealing plays an important role such as preventing deterioration of product features in manufacturing process.
We adopt the most appropriate sealing method for each product including the press-fit type, the adherence type that uses melted brazing filler metal on a lid, and resistance welding (seam welding), which seals by applying a current.
In sealing, the key is how to maintain airtightness, and our high technology is fully utilized here.

• Vacuum Sealing Details