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

A technology of fluorophosphoric acid glass and optical components, which is applied in the direction of optical components, 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 methods of manufacturing the same
  • Fluorophosphate glass, precision press molding preform, optical element blank, optical element and methods of manufacturing the same
  • Fluorophosphate glass, precision press molding preform, optical element blank, optical element and methods of manufacturing the same

Examples

Experimental program
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Embodiment

[0187] 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

[0188] Example 1 and Comparative Example 1 (Manufacturing Example of Fluorophosphate Glass)

[0189] In order to manufacture fluorophosphate glasses No. 1 to No. 4 and comparative fluorophosphate glasses having the compositions shown in Table 1, raw materials such as phosphates such as diphosphates and fluorides corresponding to the respective glass components were weighed, and Mix well. O in each mixed raw material 2- The total content and P 5+ The ratio of the total content (O 2- / P 5+ ) and the content ratio of rare earth elements (cation %) are described together. 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 glasses No. 1 to No. 4.

[0190] In the manufacture of each fluorophosphoric acid glass of fluorophosphoric acid glass No.1 to No.4, as shown in Table 1, O 2- The total content and P 5+ The rati...

Embodiment 2

[0209] Example 2 (Manufacturing Example of Preform for Precision Compression Molding)

[0210] The gob of molten glass was separated by a method in which the molten glass formed from each of the fluorophosphate glasses No. 1 to No. 4 shown in Table 1 was cooled from the temperature without devitrification of the glass. Flow out at a constant flow rate from a platinum alloy pipe adjusted to a temperature range capable of stably flowing out, and drop glass gobs; or use a support to support the tip of the flow of molten glass, then suddenly lower the support to separate the glass gobs. 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.

[0211] 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 forming them to produce a preform for precision press m...

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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 30 to 50 cationic % of a phosphorus ingredient in terms of P5+, the glass having, in a nuclear magnetic resonance spectrum, a resonance spectrum which is generated near a reference frequency of 31P and has a shape of Gaussian function. 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 its properties such as low dispersion, abnormal dispersion, and high light transmittance in 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 effective 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 blocking near-infrared light, ...

Claims

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Application Information

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IPC IPC(8): C03C3/247G02B1/00C03B11/08
Inventor 池西干男
Owner HOYA CORP
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