Optical glass, optical element and process for the production thereof

A technology for optical glass and optical components, applied in glass manufacturing equipment, glass pressing, manufacturing tools, etc., to achieve good workability and suppress chromatic aberration
CN1903765AInactive Publication Date: 2007-01-31HOYA CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HOYA CORP
Publication Date
2007-01-31
Estimated Expiration
Not applicable Β· inactive patent
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Abstract

Provided are an optical glass having high-refractivity, low-dispersion and anomalous partial dispersion properties, having excellent processability, being excellent as an anomalous partial dispersion glass for suppressing chromatic aberration, containing P5+, Al3+ and alkaline earth metal ions selected from the group consisting of Mg2+, Ca2+, Sr2+ and Ba2+ as essential cationic components and F- and O2- as essential anionic components, wherein the ratio of content of Ba2+ to the total content R2+ of Mg2+, Ca2+, Sr2+ and Ba2+, Ba2+ / R2+, is 0.01 or more but less than 0.5 on the basis of cationic %, and having an Abbe's number (nud) of 68 or more, optical glass having an Abbe's number (nud) of 68 or more, a partial dispersion ratio of 0.535 or more and a frictional abrasion of 500 or less and an optical glass which is to be polished in a polishing step for producing an optical element and which is a fluorophosphate glass having a frictional abrasion of 500 or less.
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Description

technical field

[0001] The invention relates to optical glass, an optical element and a manufacturing method thereof. More particularly, the present invention relates to an optical glass having a high refractive index, low dispersion, and anomalous partial dispersion properties, an optical element formed from the above glass, and a method for manufacturing the optical element, the glass being suitable for use in It is used for the glass of camera or projector lens, and has excellent processability. Background technique

[0002] In optical systems such as cameras etc., a design is often used for "achromaticity" in which glasses with different Abbe numbers are combined to remove chromatic aberration of the lens. Combining glasses with very different Abbe numbers can have a dramatic effect on the removal described above. In particular, secondary achromats require anomalous partial dispersion glass that has a different partial dispersion ratio than conventional optical glasses...

Claims

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