Preparation method of large-diameter aspheric lens

A technology of aspheric lens and large diameter, applied in glass manufacturing equipment, manufacturing tools, glass pressing, etc., can solve the problems of large diameter and high precision aspheric lens size and volume, achieve low internal stress and reduce structure Poor, fast heat conduction effect

Active Publication Date: 2017-10-27
深圳市天阳谷科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Large-diameter high-precision aspheric lenses are not suitable for small-diameter lenses due to their huge size and volume. Multi-station high-temperature molding process

Method used

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  • Preparation method of large-diameter aspheric lens
  • Preparation method of large-diameter aspheric lens
  • Preparation method of large-diameter aspheric lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The glass material of the glass material is K~VC89, the diameter of the glass material is 120mm, and the diameter of the aspheric lens after molding is 150mm:

[0044] (1) Making mold cores and glass materials: making mold cores and glass materials for molding large-diameter aspheric lenses. The inner diameter of the molding cavity of the mold core is 150 mm, and the diameter of the glass material is 120 mm;

[0045] (2) Put the glass nitrate material into the mold core: put the glass nitrate material into the mold core, the spherical surface of the glass nitrate material corresponds to the aspherical surface of the mold core;

[0046] (3) Put the mold core into the molding station: put the mold core filled with glass nitrate material into the lower working surface of the molding station;

[0047] (4) Vacuuming the station: seal the molding station and evacuate it, and stop vacuuming when the vacuum degree reaches 5×10-1Pa;

[0048] (5) Inject nitrogen into the station...

Embodiment 2

[0061] The glass material of the glass material is K~PBK40, the diameter of the glass material is 40mm, and the diameter of the aspheric lens after molding is 50mm;

[0062] (1) Making mold cores and glass materials: making mold cores and glass materials for molding large-diameter aspheric lenses. The inner diameter of the molding cavity of the mold core is 50 mm, and the diameter of the glass material is 40 mm;

[0063] (2) Put the glass nitrate material into the mold core: put the glass nitrate material into the mold core, the spherical surface of the glass nitrate material corresponds to the aspherical surface of the mold core;

[0064] (3) Put the mold core into the molding station: put the mold core filled with glass nitrate material into the lower working surface of the molding station;

[0065] (4) Vacuuming the station: seal the molding station and evacuate it, and stop vacuuming when the vacuum degree reaches 6×10-1Pa;

[0066] (5) Inject nitrogen into the station: i...

Embodiment 3

[0079] The glass material of the glass material is D~ZK3, the diameter of the glass material is 70mm, and the diameter of the aspheric lens after molding is 80mm:

[0080] (1) Making mold cores and glass materials: making mold cores and glass materials for molding large-diameter aspheric lenses. The inner diameter of the molding cavity of the mold cores is 80 mm, and the diameter of the glass materials is 70 mm;

[0081] (2) Put the glass nitrate material into the mold core: put the glass nitrate material into the mold core, the spherical surface of the glass nitrate material corresponds to the aspherical surface of the mold core;

[0082] (3) Put the mold core into the molding station: put the mold core filled with glass nitrate material into the lower working surface of the molding station;

[0083] (4) Vacuuming the station: seal the molding station and evacuate it, and stop vacuuming when the vacuum degree reaches 6×10-1Pa;

[0084] (5) Inject nitrogen into the station: inj...

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Abstract

The invention discloses a preparation method of a large-diameter aspheric lens. The preparation method comprises the following steps: (1) making a die kernel and a glass nitrate material; (2) putting the glass nitrate material in the die kernel; (3) putting the die kernel on a die pressing station; (4) vacuum-pumping the station; (5) injecting nitrogen gas into the station; (6) increasing the temperature; (7) enabling the temperature to be uniform; (8) molding by die pressing; (9) annealing; (10) reducing the temperature; (11) discharging the nitrogen gas; (12) taking out the die kernel; (13) taking out a product. The preparation method disclosed by the invention has the benefits that the adjustment of an internal structure of the lens is finished through the relatively-slow temperature reducing process, so that a structural difference among all parts of glass is reduced; the residual stress inside the lens is released, so that an aspheric outline of a molding body is fixed on the status quo of the completed die-pressing stage; the residual stress inside the lens is reduced to a reasonable range so as to prevent the molded lens from cracking due to non-uniform temperature distribution in the subsequent quenching procedure.

Description

technical field [0001] The invention belongs to the technical field of optical components, and relates to a method for preparing a large-diameter aspherical lens. Background technique [0002] Large-diameter high-precision aspheric lenses are not suitable for the multi-station high-temperature molding process of small-diameter lenses due to their huge size and volume. When large-diameter lenses are molded, under the effect of huge molding pressure and glass structure relaxation at the transition point temperature, the residual stress inside the lens is huge, which can easily cause large-diameter lenses to break after cooling, or be affected by the extreme environment during use. , leading to cracking of large-diameter lenses, which is a fatal flaw in military and aerospace systems. Therefore, the internal residual stress of large-diameter lenses must be minimized during the molding stage to ensure that large-diameter lenses meet the requirements of military and aerospace sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B11/00C03B11/08
CPCC03B11/00C03B11/08
Inventor 黄燕平李立周小平张怀忠
Owner 深圳市天阳谷科技发展有限公司
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