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P-SF67 Lead- and Arsenic-Free Glass

Photonics.com
Oct 2006
SCHOTT North America Inc., Advanced OpticsRequest Info
 
DURYEA, Pa., Oct. 4, 2006 -- Schott North America has introduced its new lead- and arsenic-free P-SF67 glass to North American manufacturers of compact lens systems.

P-SF67 possesses a high refractive index of nd = 1.90680, a low glass transformation temperature of 493 °C, and an abbe number of vd = 21.40. P-SF67 has been developed to achieve the ultimate in image quality and compactness for consumer and industrial optic applications, the company said.

SchottGobs.jpgAspherical lenses are increasingly being used to build the compact high-performance lens systems found in camera phones, digital cameras, sport optic devices and medical devices. A single aspherical lens is able to compensate for image distortion and spherical aberration as efficiently as several spherical lenses. The use of an aspherical lens reduces the optical devices’ size and weight, meeting the market’s demand for smaller optical devices.

Aspherical lenses are made by pressing a polished or fire-polished preform made from low Tg glasses in a precision mold at temperatures typically between 400 and 600 °C. Low Tg glasses with low transformation temperatures lengthen the lifetime of the mold and provide a higher output of aspherical lenses, reducing costs for the precision mold process.

P-SF67 is currently available to Schott North American customers as polished preforms.

For more information, visit: http://us.schott.com; e-mail: info@us.schott.com 

Schott North America Inc.
555 Taxter Rd.
Elmsford, NY 10523
Phone: (914) 831-2200
Fax: (914) 831-2201



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GLOSSARY
glass
A noncrystalline, inorganic mixture of various metallic oxides fused by heating with glassifiers such as silica, or boric or phosphoric oxides. Common window or bottle glass is a mixture of soda, lime and sand, melted and cast, rolled or blown to shape. Most glasses are transparent in the visible spectrum and up to about 2.5 µm in the infrared, but some are opaque such as natural obsidian; these are, nevertheless, useful as mirror blanks. Traces of some elements such as cobalt, copper and...
image
In optics, an image is the reconstruction of light rays from a source or object when light from that source or object is passed through a system of optics and onto an image forming plane. Light rays passing through an optical system tend to either converge (real image) or diverge (virtual image) to a plane (also called the image plane) in which a visual reproduction of the object is formed. This reconstructed pictorial representation of the object is called an image.
lens
A transparent optical component consisting of one or more pieces of optical glass with surfaces so curved (usually spherical) that they serve to converge or diverge the transmitted rays from an object, thus forming a real or virtual image of that object.
preform
A glass structure from which an optical fiber waveguide may be drawn.
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