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Method for making glass product

A manufacturing method and technology of glass products, applied in glass manufacturing equipment, glass molding, glass pressing, etc., can solve problems such as sharp increase in defect rate and uneven surface layer state of glass raw materials

Inactive Publication Date: 2004-05-12
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to this method, although there is a certain effect, due to the method of so-called heat treatment under reduced pressure, the state of the surface layer of the glass raw material for molding is not uniform, or repeated molding with the same metal mold, for example, if more than 500 times In continuous molding, heat sticking may partially occur on the surface of the metal mold or the surface of the release film provided on the metal mold, and the defective rate will increase sharply, so satisfactory results cannot be obtained.

Method used

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  • Method for making glass product
  • Method for making glass product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] For optical element molding raw materials that have been washed with high precision by the wet cleaning method with a commercially available precision cleaning machine for optics, and stored in a high-clean environment in nitrogen after washing, sampling inspections are performed for each washing and storage lot. With pure water and CH 2 I 2 The wetting angle was determined by the Owens-Wendt-Kaelble method to evaluate the surface free energy. Minimum surface free energy value of 68mJ / m for all batches 2 Above, the surface free energy that satisfies the claims of the present invention is at 60mJ / m 2 above.

[0140] In addition, high-precision washing by the wet washing method is performed as follows.

[0141] ①Tap water tank (ultrasonic) for 1 minute→②Tap water tank (ultrasonic) for 1 minute→③Washing tank (ultrasonic) for 1 minute→④Pure water tank (ultrasonic) for 1 minute→⑤Pure water tank (ultrasonic) for 1 minute→⑥Isopropanol tank (Ultrasonic) for 1 minute → ⑦ Is...

Embodiment 2

[0151] Except that cleaning was not carried out after washing, and the total organic carbon concentration in the air was stored for 2 days in a room with a total organic carbon concentration of 8000 μgC / L, it was carried out in the same manner as in Example 1. For the prepared optical element molding raw material, it was carried out in the same manner as in Example 1. Sampling inspection of each washing and storage lot, for pure water and CH 2 I 2 The wetting angle was determined by the Owens-Wendt-Kaelble method to evaluate the surface free energy. The minimum surface free energy is 45mJ / m 2 , in addition, the minimum value of surface free energy is less than 60mJ / m 2 The bulk volume accounted for 19%. The minimum value of surface free energy is less than 60mJ / m 2 of batches, only the minimum value of the surface free energy is 60mJ / m 2 The above batches of optical element molding raw materials were continuously press-molded in the same manner as in Example 1.

[0152] ...

Embodiment 3

[0154] Same as embodiment 2, only the minimum value of surface free energy is 60mJ / m 2 The above-mentioned batches of optical element molding raw materials were formed into a film with a film thickness of 1 nm by a-C:H by thermal decomposition CVD method of acetylene gas.

[0155] The molded raw materials were stored in the same room as in Example 2 for 2 days, and the environment of the molded raw materials being transported had a total organic carbon concentration of 500 μgC / L and a cleanliness level of ISO 6. In addition, in the following CVD apparatus, the total organic carbon concentration is 2000 μgC / L, and the cleanliness level is ISO class 5.

[0156] The CVD method by thermal decomposition of acetylene gas is performed as follows.

[0157] The glass raw material was placed in a quartz shallow dish and placed in a glass bell jar (reaction vessel). After degassing the inside of the glass bell jar to below 0.5 Torr with a vacuum pump, it was heated and maintained at 48...

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Abstract

A method of manufacturing a glass article comprises the steps of heat softening a glass material that has been preformed and press molding the glass material with a pressing mold. A glass material having a surface free energy of greater than or equal to 60 mJ / m<2 >is fed to the heat softening step, and then fed to the press molding step. Alternatively, a surface layer is formed on a preformed glass material having a surface free energy of greater than or equal to 60 mJ / m<2>, and then the preformed glass material is fed to the heat softening step and press molding step. Provided is a method of manufacturing glass products capable of easily obtaining glass products without surface fogging, clouding and cracking without large scale facility.

Description

technical field [0001] The present invention relates to a method for manufacturing a glass product, especially a glass optical element, which is formed by pressing a heated and softened glass raw material in a molding die. Background technique [0002] As a more productive molding method for simplifying precision optical glass elements, there is a press molding method. The compression molding method is to put the glass raw material for forming into a predetermined shape by melting and solidifying or cold processing the glass in advance, and put it into the forming mold, soften it by heating and extrude it in a state that can be formed, so as to keep it in the mold. A method of cooling the state of the glass element to obtain the glass element. If this method is used, the formed glass element does not require grinding processing for the use of a precision-machined metal mold. [0003] When forming a glass element by press molding, the glass material for forming and the meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B40/02
CPCC03B2215/17C03B2215/66C03B40/02C03B2215/24C03B2215/22Y02P40/57
Inventor 白石幸一郎近江成明
Owner HOYA CORP
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