Optical glass, optical preform and optical element

An optical glass and summation technology, applied in optical components, optics, instruments, etc., can solve the problems of low production yield, white turbid glass surface, inability to make optical components, etc., and achieve the effect of improving yield and molding performance.

Active Publication Date: 2018-01-05
CDGM OPTICAL GLASS
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  • Abstract
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Problems solved by technology

[0003] In the prior art, fluorophosphate optical glass with a refractive index of 1.46-1.53 ​​and an Abbe number in the range of 77-84 is prone to breakage or cracks during the precision molding process, and often accompanied by white turbidity and Fogging, unable to make effective optical components, low production yield

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  • Optical glass, optical preform and optical element
  • Optical glass, optical preform and optical element
  • Optical glass, optical preform and optical element

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Embodiment Construction

[0027] The optical glass of the present invention contains P 5+ 、Al 3+ and alkaline earth metals as cationic components, containing O 2- and F - As an anionic component, where F - The molar percentage of content relative to the total amount of anions and P 5+ The ratio F of the content relative to the molar percentage of the total amount of cations - / P 5+ 2.5 or more, and the refractive index (nd) is 1.46-1.53, the Abbe number (ν d ) is 77-84.

[0028] Ⅰ. Optical glass

[0029] Each component which comprises the optical glass of this invention is demonstrated.

[0030] In this specification, unless otherwise specified, the content of each component is expressed by the percentage of the cation in the total moles of the cations, and the percentage of the anion in the total moles of the anions. . In addition, in the following description, when referring to a predetermined value or less or a predetermined value or more, the predetermined value is also included.

[0031...

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Abstract

The invention provides optical glass with excellent precise molding properties, a refractive index of 1.46 to 1.53 and an Abbe number of 77 to 84. The optical glass comprises the following cations bymol: 10-30% of P<5+>,10-35% of Al<3+>, 1-20% of Ba<2+>, 15-35% of Sr<2+>, 1-20% of Ca<2+>, 0-10% of Gd<3+> and 0-10% of Na<+>, wherein a ratio of Sr<2+>/(Gd<3+> + Na<+>) is 1-30. The optical glass comprises the following anions: F<-> and O<2->. A ratio F<->/P<5+> of the molar percentage of F<-> relative to the total amount of the anions and the molar percentage of P<5+> relative to the total amount of the cations is 2.5 or more. According to the invention, through reasonable adjustment of the ratio of components, the moldability of the optical glass is improved, the problems of damage and fogging in the molding process are overcome, and the yield of production of the optical element is greatly improved.

Description

technical field [0001] The invention relates to a low-refraction and low-dispersion optical glass, in particular to a low-refraction and low-dispersion fluorophosphate optical glass, an optical prefabricated part and an optical element. Background technique [0002] In recent years, with the rapid popularization of digital cameras, video cameras and camera phones, optical materials have also developed rapidly in the direction of high precision and miniaturization. In order to meet the above requirements, the use of aspheric lenses for optical design has become the mainstream; At the same time, more and more attention has been paid to the precision molding technology with low cost and high yield in the manufacture of optical components. As a new type of glass material widely used, fluorophosphate optical glass has the characteristics of low dispersion and low refractive index. In the optical system, it can eliminate the special dispersion of the secondary spectrum, improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C4/00C03C3/247G02B1/00
Inventor 匡波
Owner CDGM OPTICAL GLASS
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