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Optical glass refers to a quality of glass suitable for the manufacture of optical systems such as optical lenses, prisms or mirrors.Unlike window glass or crystal, whose formula is adapted to the desired aesthetic effect, optical glass contains additives designed to modify certain optical or mechanical properties of the glass: refractive index, dispersion, transmittance, thermal expansion and ...
Ohara Inc. (株式会社オハラ, Kabushiki-gaisha Ohara) is a Japanese global glass manufacturing company. It 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.
Target Optical was founded by the Cole National Corporation in 1995 [1] in Cleveland, Ohio. In 2004, the Cole National Corporation was acquired by the Italian Luxottica S.p.A. along with other Cole National Corporation holdings such as Pearle Vision. Luxottica folded Cole's operations into its North American Retail Group and the Cole structure ...
The LCD glass substrate is produced without heavy metals. Corning is a leading manufacturer of the glass used in liquid crystal displays. [23] The company continues to produce optical fiber and cable for the communications industry at its Wilmington and Concord plants in North Carolina.
Zenni Optical mail order. Zenni Optical was founded in 2003 by Tibor Laczay and Julia Zhen. [1] [2] Before being renamed to Zenni Optical when it began offering $7 and $8 glasses, the company was named 19dollareyeglasses.com. [3] [4] [5] Around 2014, co-founder Zhen acquired the building occupied by the Marin Independent Journal to house Zenni. [6]
The international glass code is based on U.S. military standard MIL-G-174, and is a six-digit number specifying the glass according to its refractive index n d at the Fraunhofer d- (or D 3-) line, 589.3 nm, and its Abbe number V d also taken at that line.
Glasses are classified using the Schott Glass letter-number code to reflect their composition and position on the diagram. Flint glass is optical glass that has relatively high refractive index and low Abbe number (high dispersion). Flint glasses are arbitrarily defined as having an Abbe number of 50 to 55 or less.
Low-dispersion glass (LD glass) is a type of glass with reduced chromatic aberration, meaning the refractive index does not change as strongly with different wavelengths of light. In other words, the light passing through the glass has a smaller spread or dispersion between its constituent colors, resulting in a reduced " rainbow effect" at ...
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