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Optical glass, optical element and preformed body

A technology for optical glass and optical components, applied in the field of optical components, preforms, and optical glass, can solve the problems of difficult glass processing, easy damage to glass, etc. Effect

Active Publication Date: 2011-03-30
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In addition, when using the glass disclosed in Patent Document 1, when an optical element is obtained by grinding a glass molded product after reheating and press molding, or when grinding a gob or a glass gob, the Glass is easily damaged, so glass handling is difficult

Method used

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  • Optical glass, optical element and preformed body
  • Optical glass, optical element and preformed body
  • Optical glass, optical element and preformed body

Examples

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Embodiment

[0104] The composition and refractive index (n d ), Abbe number (ν d ), partial dispersion ratio (θg, F), anomalous dispersion (Δθg, F) ​​and wear degree are shown in Table 1. It should be noted that the following examples are for illustrative purposes only, and the present invention is not limited to these examples.

[0105] For the optical glass of the examples (No.1-No.5) of the present invention and the glass of the comparative example (No.1), oxides, carbonates, nitrates, fluorides, and metaphosphoric acid compounds corresponding to each component are selected. The high-purity raw materials used in common fluorophosphate glass are weighed and mixed uniformly according to the composition ratios of the examples and comparative examples shown in Table 1 as the raw materials of each component. Then put the mixture of raw materials into a platinum crucible, and according to the melting difficulty of the glass composition, melt it in an electric furnace at a temperature range...

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Abstract

The present invention provides an optical glass having a specific high refractivity and low chromatic dispersion (high Abbe number), and capable of being easily grinded to process and correcting chromatic dispersion of a lens with high precision, an optical element and a preformed body. The optical glass contains P, at least more than two alkaline-earth metal elements and more than one rare-earth elements as anion component, contains O and F as anion component; and has a refractivity (nd) more than 1.50 and less than 1.65, and an Abbe number (vd) more than 60 and less than 77. The invention also provides the optical element made of the optical glass.

Description

technical field [0001] The present invention relates to optical glass, optical element and preform. Background technique [0002] Usually, the lens system of an optical instrument is designed by combining multiple glass lenses with different optical properties. In recent years, in order to further expand the design freedom of lens systems of various optical instruments, optical glass with optical characteristics that cannot be used in the past has been used as optical elements such as spherical and aspheric lenses. In particular, glasses with various refractive indices and dispersion tendencies are being developed to reduce chromatic aberration in the entire optical system during optical design. Among them, optical elements made of optical glass with a high partial dispersion ratio (θg, F) ​​have high anomalous dispersion properties (Δθg, F) ​​as described below, so they can significantly correct the effect of chromatic aberration, And the degree of freedom of optical desi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/04C03C3/247C03B11/08
Inventor 吉川健
Owner OHARA
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