Die forming pre-compensation method for aspheric glass lens

An aspheric lens, molding technology, applied in the direction of design optimization/simulation, etc., can solve the problem of reducing the reliability of pre-compensation parameters, affecting the lens deviation value, etc., to achieve compensation for profile deviation, strong practical value, and saving numerical simulation effect of steps

Active Publication Date: 2020-03-17
TIANJIN UNIV
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Problems solved by technology

However, although the method of material simulation can quickly obtain the pre-compensation value, there is still a big difference between the theoretical calculation and the actual production conditions, and some uncontrollable factors may still affect the deviation value of the lens, making the prediction obtained by theoretical calculation Reduced confidence in compensation parameters

Method used

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  • Die forming pre-compensation method for aspheric glass lens
  • Die forming pre-compensation method for aspheric glass lens
  • Die forming pre-compensation method for aspheric glass lens

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Experimental program
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Embodiment

[0037] 1. Lens surface characterization and compensation value determination

[0038] For glass aspheric lenses, the profile is generally expressed by the following formula:

[0039]

[0040] Among them, the parameters c, k, a 2 , a 4 , a 6 , a 8 , a 10 , a 12 Can uniquely identify a specific aspheric lens. Its aspherical height h=y(r).

[0041] Here, through empirical data collected in actual production, compensation schemes for two different lenses are obtained. The lens radius r, the target surface parameters and the mold surface parameters after compensation are shown in the table below, and the general mold surface compensation method can be deduced accordingly.

[0042] Table 1 The original and compensated profiles of the two lenses

[0043]

[0044] It can be seen from practical experience that the radius of curvature R and the conic coefficient k of the aspheric surface are generally not changed during mold compensation, but only a series of polynomial c...

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PUM

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Abstract

The invention discloses a die forming pre-compensation method for an aspheric lens. The die forming pre-compensation method comprises the steps of representing a lens profile, measuring a compensationvalue and determining the weight of the compensation value, wherein the lens profile representation and compensation value measurement comprises the following steps: establishing a parameter libraryby collecting a reference lens and pre-compensation parameters of the reference lens, and then establishing a pre-compensation mathematical model, wherein the step of determining the weight of the compensation value is to compare the parameter similarity of the lens to be produced and the reference lens, calculate the aspheric surface parameter of the lens to be produced corresponding to the pre-compensation mold, and obtain the weight to be determined in the pre-compensation mathematical model, thereby obtaining the pre-compensation molded surface. Based on standard compensation amount data in production, a mold compensation scheme is determined by endowing different weights to the standard compensation amount data. According to the method, the profile deviation of the aspheric lens can be well compensated, redundant numerical simulation steps are omitted, and the method has high practical value.

Description

technical field [0001] The invention belongs to the field of precision processing of optical glass, in particular to a compensation method for molding optical glass. Background technique [0002] The production process of glass lenses involves heat treatment and molding. Due to the viscoelastic properties of the glass material itself, after thermoforming, the lens made by the molding method often has a gap with the expected surface, that is, there is a gap between the lens and the mold. Perfect fit. Especially for the precise forming of aspheric lenses, the impact of small deviations on the surface on the final optical quality cannot be ignored. In order to make the lens to achieve the expected shape, it is usually necessary to compensate the mold. The traditional compensation method uses repeated molding experiments to compensate the lens deviation obtained in this experiment to the next experiment mold, and so on. Because the molding experiment is time-consuming and lab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20
CPCY02P40/57
Inventor 宋乐张越宋雨濛谢琮玖房丰洲
Owner TIANJIN UNIV
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