Ohara Corporation

Ohara Corporation is the U.S. subsidiary of the Japanese optical manufacturer Ohara Group.

The parent company is headquartered in Japan. There are subsidiaries in a number of countries, including Japan, the United States, Germany, Hong Kong, Maylasia, Taiwan, and China.

Ohara manufactures glasses since 1935.

Their web site lists areas of specialization, including:

• Optical Glass
• Polished Substates
• Fused Silica and Quartz
• IR Materials and Optical Crystals
• Low Expansion Glass
• Glass Ceramics
• Measurement Services

Optical glass

Among other things, Ohara is a major supplier of optical glass. Lens design programs will typically include glasses in the Ohara catalog among their stock material choices, along with, for example, glasses in the Schott catalog.^[1]

On their website, Ohara describes a line of more than 130 environmentally safe glasses, produced without lead and arsenic.

They produce more than 300 tons of optical glass a month (against 10800 tons/month for Schott and over 108000 tons/month for Corning). The glass is available in a variety of forms, including strip, slab, cut blanks, and pressings.

Ohara includes in its catalog the famous E6 borosilicate (similar to Corning's Pyrex), ClearCeram-Z (a vitroceramic similar to Schott's Zerodur), and two well-known low dipersion glasses : FPL51 (the UD glass used by Canon) and FPL53 showing properties close to fluorite.

Telescope mirror glass

Ohara supplied over 23.5 tons of their E6 borosilicate glass to be cast into the blank of the primary and tertiary mirror of the LSST^[2]

E6 glass was also used to manufacture the mirror of the Giant Magellan Telescope (GMT) and the Large Binocular Telescope (LBT), both having a primary mirror 8.4 m wide.

References

External links

• Ohara Group