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Process for the production of precision press-molding preform and process for the production of optical element

A technology of preforms and precision pressure, which is applied in the field of manufacturing preforms for precision pressure forming, and can solve problems such as easy to produce

Inactive Publication Date: 2006-09-06
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The above problems especially in forming containing P 2 o 5 , Nb 2 o 5 and Li 2 O optical glass, containing B 2 o 3 , La 2 o 5 High refractive index glass such as optical glass, fluorine-containing glass is easy to produce

Method used

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  • Process for the production of precision press-molding preform and process for the production of optical element
  • Process for the production of precision press-molding preform and process for the production of optical element

Examples

Experimental program
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Effect test

Embodiment

[0252] Hereinafter, the present invention will be described in further detail through examples, but the present invention is not limited to this example.

[0253] Example

[0254] (1) Manufacturing containing P 2 o 5 , Nb 2 o 5 , Li 2 O optical glass

[0255] Tables 1 to 5 show the composition of the glass material used to manufacture the preform and its properties: refractive index (nd), Abbe number (υd), transition temperature (Tg), yield point (Ts) and liquidus temperature (L.T.). As the raw materials of each component, corresponding oxides, fluorides, hydroxides, carbonates, and nitrates were used. After vitrification, the compositions shown in Table 1 to Table 5 were weighed, mixed thoroughly, and then put into In the platinum crucible, use an electric furnace to melt, clarify, stir and homogenize within the temperature range of 1050-1200 °C, pour it into a mold preheated to an appropriate temperature, cool to the glass transition temperature, and then immediately ...

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PUM

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Abstract

A process for producing a precision press-molding preform having a predetermined weight from a molten glass, wherein the molten glass is shaped into a glass gob and the above glass gob is etched to remove a surface layer of the glass gob to produce the precision press-molding preform formed of an optical glass having said weight, and further wherein said surface layer has a thickness of 0.5 mum or more.

Description

technical field [0001] The present invention relates to a method for manufacturing a preform for precision press molding and a method for manufacturing an optical element. More specifically, the present invention relates to the production of high-quality preforms for precision press molding with high productivity by utilizing thermoforming of glass A method for manufacturing a preform; and a method for manufacturing a high-quality optical element with high productivity by subjecting the preform manufactured by the aforementioned method to precise press-forming. Background technique [0002] The demand for optical glass lenses is rapidly increasing with the spread of digital cameras and mobile phones. In order to meet this need, people are paying attention to precision press forming technology that can manufacture optical elements made of glass with high productivity. [0003] The precision pressure forming method uses pressure forming to transfer the forming surface of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B11/00C03C15/00C03C3/066G02B3/00
CPCY02P40/57
Inventor 池西干男邹学禄
Owner HOYA CORP
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