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Fluorophosphate glass, precision press molding preform, optical element blank, optical element and method of manufacturing the same

A fluorophosphoric acid glass, optical element technology, applied in optical elements, glass pressing, glass manufacturing equipment, etc., to achieve the effect of excellent uniformity

Active Publication Date: 2009-09-30
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention disclosed in Japanese Patent Application Laid-Open No. 2007-76958 is a very excellent technology for solving the problems inherent in fluorophosphate glass, but further improvement is desired from the following viewpoints

Method used

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  • Fluorophosphate glass, precision press molding preform, optical element blank, optical element and method of manufacturing the same
  • Fluorophosphate glass, precision press molding preform, optical element blank, optical element and method of manufacturing the same
  • Fluorophosphate glass, precision press molding preform, optical element blank, optical element and method of manufacturing the same

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Embodiment

[0183] Hereinafter, the present invention will be described in further detail through examples, but the present invention is not limited by these examples at all.

Embodiment 1

[0184] Example 1 and Comparative Example 1 (Manufacturing Example of Fluorophosphate Glass)

[0185] In order to manufacture fluorophosphoric acid glass Nos. 1 to 17 and comparative fluorophosphoric acid glass Nos. 1 and 2 having the compositions shown in Table 1-1 to Table 1-5, weigh the diphosphate corresponding to each glass composition. and other raw materials such as phosphate and fluoride, and thoroughly mix them. O in each mixed raw material 2- The total content and P 5+ The ratio of the total content (O 2- / P 5+ ), the total content of alkaline earth metal components and the total content of rare earth components are described in Table 1-1 to Table 1-5 together with the composition and characteristics of each glass. The above-mentioned mixed raw materials were put into a platinum crucible, stirred in an electric furnace at 900°C, heated and melted for 1 to 3 hours, clarified and homogenized, thereby obtaining fluorophosphate glass Nos. 1 to 17.

[0186] In the man...

Embodiment 2

[0221] Example 2 (Manufacturing Example of Preform for Precision Compression Molding)

[0222] The lump of molten glass was separated by a method in which the molten glass formed from each of the fluorophosphate glasses No. 1 to 17 shown in Table 1-1 to Table 1-5 was not devitrified in the glass. In some cases, the molten glass flows out at a certain flow rate from a platinum alloy pipe whose temperature is adjusted to a temperature range where it can flow out stably, and the glass block drops; or after the support body is used to support the top of the molten glass flow, the support body is suddenly lowered and separated. glass block. Each obtained molten-glass gob has the weight which added the weight of the removal part mentioned later to the weight of one target preform.

[0223] Next, each of the obtained molten glass gobs was received in a support mold having a gas ejection port at the bottom, and gas was ejected from the gas ejection port to float the glass gobs while ...

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Abstract

The invnetion provides fluoroposphate glass, precision press molding preform, optical element blank, optical element and method of manufacturing the same. A fluorophosphate glass of the invention contains more than 3 cationic % and 30 cationic % or less of a phosphorus ingredient in terms of P<5+>, the glass having a ratio I(1) / I(0) of equal to or less than 0.08 in which I(0) is a strength of a resonance peak generated near a reference frequency of <31>P in a nuclear magnetic resonance spectrum and I(1) is a strength of a first-order side band peak of the resonance peak. The glass of the invention is reduced in volatility and erosiveness.

Description

technical field [0001] The present invention relates to fluorophosphate glass suitable as a material for optical elements such as lenses, prisms, and filters, a preform for precision press molding made of the glass, an optical element blank, an optical element, and methods for producing the same. Background technique [0002] Fluorophosphate glass is in great demand due to properties such as low dispersion, anomalous dispersion, and high light transmittance over a wide range of the visible region. Low dispersion and abnormal dispersion are more effective for correcting chromatic aberration, and excellent high light transmittance is not only used as an optical element material constituting an imaging optical system, but also as an optical element material for guiding short-wavelength light such as near ultraviolet light. It is effective, and by adding copper ions to the fluorophosphate glass, it is possible to provide a filter function for cutting off near-infrared light, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/247G02B1/00C03B11/08
Inventor 池西干男
Owner HOYA CORP
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