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A kind of preparation method of large-diameter aspheric lens

An aspheric lens, large-diameter technology, used in glass manufacturing equipment, manufacturing tools, glass pressing, etc., can solve the problems of large diameter and high-precision aspheric lens size and volume, and achieve low internal stress and heat transfer distance. Short, reduce the effect of poor structure

Active Publication Date: 2021-06-11
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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  • A kind of preparation method of large-diameter aspheric lens
  • A kind of preparation method of large-diameter aspheric lens
  • A kind of 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 aspheric 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 aspheric 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: injec...

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Abstract

The invention discloses a method for preparing a large-diameter aspheric lens, which comprises the following steps: (1), making a mold core and glass nitrate material; (2), putting the glass nitrate material into the mold core; (3), putting the mold core into a molding station (4), vacuum pumping at the station; (5), nitrogen injection at the station; (6), temperature rise; (7), temperature soaking; (8), compression molding; (9), annealing; (10), Cool down; (11), exhaust nitrogen; (12), take out the mold core; (13), take out the product. The invention completes the adjustment of the internal structure of the lens through a relatively slow cooling process, reduces the structural difference between the various parts of the glass, releases the residual stress inside the lens, and fixes the aspheric surface profile of the molded body at the status quo that has been completed in the molding stage. The residual stress is reduced to a reasonable range to prevent the molded lens from cracking due to uneven temperature distribution in the subsequent quenching process.

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 Patents(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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