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Optical glass with abnormal dispersity

An anomalous dispersion and optical glass technology, applied in optics, optical components, instruments, etc., can solve problems such as poor chemical durability, poor light transmittance, and glass without abnormal dispersibility

Inactive Publication Date: 2003-10-29
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Poor chemical durability
(3) Difference in light transmittance on the short-wave side of the visible light wavelength region
(4) Poor meltability, it must be melted at high temperature, so fluorine volatilizes, it is difficult to obtain homogeneous glass with desired optical properties
[0011] In addition, JP-A-8-290936 discloses several optical constants with a refractive index (nd) of 1.48 to less than 1.55 and an Abbe number (νd) of 45 to 55, without PbO and As 2 o 3 Specific composition of glasses, but these glasses do not have positive anomalous dispersion, or have problems with glass coloring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] The compositions of optical glass examples (1-8) with positive anomalous dispersibility of the present invention and conventional optical glass comparative examples (A-F) are as shown in Table 2-Table 5, wherein each embodiment and Refractive index (nd), Abbe number (νd), θg, F, Δθg, F of the glass of each comparative example, the glass with a thickness of 10 ± 0.1mm can pass through the glass with a light transmittance of 80% including reflection loss wavelength of light (T 80 ), transition temperature (Tg), water resistance (level) and the results of reheating tests. However, since all the glasses of Comparative Example (D) were brown, the above physical properties were not listed.

[0040] In addition, in Table 2 and Table 3, (K 2 The value in column O) indicates the K replaced by fluoride 2 The mass % of O, column (F) indicates that K is replaced 2 The amount (mass %) of F of the fluoride of O.

[0041] Here, θg, F and Δθg, F are calculated based on the aforeme...

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Abstract

An optical glass having a positive anomalous dispersion comprises, in mass %, is free of PbO and As2O3 except for unavoidable mixing of these compounds as impurities, has optical constants of a refractive index (nd) within the range from 1.48 to less than 1.55 and an Abbe number ( nu d) within the range from 45 to 55, and has an anomalous dispersion ( DELTA &thetas; g,F) of + 0.0010 or over.

Description

technical field [0001] The present invention relates to optical constants having a refractive index (nd) of 1.48 to less than 1.55, an Abbe number (νd) of 45 to 55, Δθg representing anomalous dispersibility, an F value of +0.0010 or more, and positive anomalous dispersibility. It is especially suitable for reheating and forming optical glass. Background technique [0002] Lenses for optical instruments, usually designed as a combination of several glass lenses with different optical properties, lenses using positive or negative anomalous dispersion glass are usually used to correct secondary spectra, low refractive index with positive anomalous dispersion Glass is not produced in a large amount, but it is technically important in order to broaden the degree of freedom in the design of lenses for various optical instruments. [0003] From the perspective of being economically applicable to a small amount of production of many varieties, the method of preparing optical elemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00C03C3/118C03C4/00
CPCC03C3/118Y10S501/903
Inventor 石冈顺子小野泽雅浩
Owner OHARA
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