CITIZEN FINETECH MIYOTA CO.,LTD.
CITIZEN Micro HumanTech
Technology
HOME > Technology > Lapping / Polishing

Lapping / Polishing

Lapping / Polishing

Our greatest advantage is the double sided ultra thin lapping and polishing technology. Moreover, we are able to supply stably.

We are able to stably supply ultra-thin, high precision double sided lapping and polishing brittle wafers, focusing on crystal. In lapping process, the both sides of a wafer are polished simultaneously between upper and lower surface plates. It realizes high removal efficiency and processing accuracy. In polishing process, abrasive cloths are attached on surfaces of upper and lower surface plates and polish the both sides of the wafer simultaneously with finer abrasive grain to finish up to an extremely smooth mirror surface.

Voice from engineers

Technology Division, Ministry of Hatai Tadashi crystal (left) and Takemura Kouzi (right)

Processing other materials besides crystal in the future is our aim.

Since we deal with ultra thin products such as 20 to 30 micron thick, we always work with the greatest care. Our advantage is double sided ultra thin lapping and polishing of large-sized wafer. Also as for brittle materials besides crystal, we already have experiences with processing optical glass and ceramics, so much more is gained for our technologies and know-how by dealing with other materials in the future.
Sadaaki Hatai, Crystal Devices Department

Fundamental technology

  • Double sided lapping & polishing of thin brittle materials
  • High precision process (reducing thickness variability)

Facilities in our factory

 
Double sided lapping / polishing Single sided lapping / polishing  

Capability

Crystal Wafer

Surface finish Wafer size Thickness Tolerance Cut angle
Lapping finish 15mm~
20mm~
0.020mm~
0.030mm~
±0.001mm~
±0.001mm~
AT&Z cut, etc.
Mirror finish 15mm~
25mm~
Φ4inch~
0.030mm~
0.043mm~
0.060mm~
±0.002mm~
±0.002mm~
±0.003mm~
AT&Z cut

* We will response to requests from each customer.

For more details

Please refer to the below PDF file for practical examples.

Technology: Lapping / Polishing (PDF file:127KB)

  • Ceramic Processing
  • Core technologies of Citizen Finetech Miyota
  • Technology Library Succeeding in various fields with original technologies
Get ADOBE READER
You need Adobe® Reader to see and print out PDF files. Please click this button and download free Adobe® Reader.
TO PAGE TOP