Ohara Inc.

Native name	株式会社オハラ
Company type	Public (K.K)
Traded as	TYO: 5218
ISIN	JP3197630001
Industry	Glass Ceramics
Founded	October 1, 1935; 88 years ago (1935-10-01)
Founder	Jinpachi Ohara
Headquarters	Chuo-ku, Sagamihara, Kanagawa 252-5286 , Japan
Area served	Worldwide
Key people	Hirokazu Saito (President)
Products	Optical glass materials Lens materials Quartz glass
Revenue	JPY 28.2 billion (FY 2018) (US$ 255 million)
Net income	JPY 3.2 billion (FY 2018) (US$ 29.15 million)
Owner	Seiko Group (41.1%) Canon (19.3%)
Number of employees	1,702 (consolidated, as of October 31, 2018)
Website	Official website
Footnotes / references [1][2][3]

Ohara Inc. (株式会社オハラ, Kabushiki-gaisha Ohara) is a Japanese global glass manufacturing company. The company is headquartered in Sagamihara with subsidiaries in a number of countries, including Japan, the United States, Germany, Hong Kong, Malaysia, Taiwan, and China, with Ohara Corporation being the U.S. subsidiary of the Ohara Group. Ohara manufactures glasses since 1935, the year of its founding.

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.^[4] 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 dispersion 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, the purest optical glass in the world,^[5] to be cast into the blank of the primary and tertiary mirror of the Large Synoptic Survey Telescope.^[6]

E6 glass was also used to manufacture the mirror of the Giant Magellan Telescope^[7] and the Large Binocular Telescope,^[8] both having a primary mirror 8.4 m wide.