Evaluation method of free cambered lens with high curvature and large caliber and design processing method thereof

An evaluation method and a large-caliber technology, applied in the fields of glasses/goggles, optics, instruments, etc., which can solve the problems of inability to accurately evaluate the quality of lenses and large deviation of theoretical values.

Active Publication Date: 2014-01-01
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for high-curvature and large-aperture free-form surface lenses, in the area far away from the center of the lens, the evaluation results obtained by this evaluation method deviate greatly from the theoretical value, and the quality of the lens cannot be accurately evaluated.

Method used

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  • Evaluation method of free cambered lens with high curvature and large caliber and design processing method thereof
  • Evaluation method of free cambered lens with high curvature and large caliber and design processing method thereof
  • Evaluation method of free cambered lens with high curvature and large caliber and design processing method thereof

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Experimental program
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Embodiment 1

[0059] In the first embodiment, the optometry obtained the parameters of the lens to be processed: the power of the aspheric lens is 8 diopters, the aspheric coefficient k=-5, the diameter is 72 mm, and the refractive index is 1.55.

[0060] The evaluation method of a high-curvature large-aperture free-form surface lens provided in the first embodiment, the specific steps are:

[0061] (1) In this embodiment, the maximum curvature k of each point on the lens is calculated according to the initial sagittal height distribution data z(x,y) of the lens according to the method disclosed in Chinese patent (200510033935.0) max (x,y) and minimum curvature k min (x,y), and the corresponding direction of maximum curvature θ max (x,y) and the direction of minimum curvature θ min (x,y), the calculation steps are as follows:

[0062] (a) In the Cartesian coordinate system o-xyz, a point P(x i ,y i ,z i ) projection on the xoy plane is P 0 (x i ,y i ,0), ν is the point P(x i ,y i...

Embodiment 2

[0101] In this embodiment, the power of the aspheric lens is 10 diopters, the aspheric coefficient k=-5, the diameter is 72 mm, and the refractive index is 1.55.

[0102] The implementation steps of embodiment two are as embodiment one, and the implementation steps of comparison reference example two are as comparison reference one, the data that obtains by described steps, drawing accompanying drawing is as follows:

[0103] Figure 9 It is the spherical light distribution diagram of the aspheric lens of the second embodiment of the present invention.

[0104] Figure 10 It is the astigmatism distribution diagram of the aspheric lens of the second embodiment of the present invention.

[0105] Figure 11 It is the distribution diagram of the spherical light intensity of the aspheric lens of the reference example 2 for comparison.

[0106] Figure 12 It is the astigmatism distribution diagram of the aspheric lens of the comparison reference example 2.

[0107] Figure 13...

Embodiment 3

[0119] In this embodiment, the parameters of the progressive multifocal lens designed by the Winthrop method are as follows: the spherical power of the far vision zone is 6 diopters, the additional diopter is 1 diopter, the diameter is 60 mm, and the refractive index is 1.55.

[0120] The implementation steps of embodiment three are as embodiment one, and the implementation steps of comparison reference example three are as comparison reference one, the data that obtains by described steps, drawing accompanying drawing is as follows:

[0121] Figure 17 It is the spherical light distribution diagram of the progressive addition lens of the third embodiment of the present invention.

[0122] Figure 18 It is the astigmatism distribution diagram of the progressive addition lens of the third embodiment of the present invention.

[0123] Figure 19 It is a graph of spherical power distribution of the progressive multifocal lens of Reference Example 3 for comparison.

[0124] ...

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Abstract

The invention discloses an evaluation method of a free cambered lens with high curvature and large caliber and a design processing method thereof. With the adoption of the technical scheme, an ordinary free cambered lens can be evaluated, besides, the free cambered lens with the high curvature and the large caliber can be evaluated; and for a high-degree lens or a lens edge position, an evaluation result is more close to a theoretical value, not only can spherical photometric values and astigmatic degree values of all points of the lens be given, but also astigmatic directions of all points can be given. At the same time, the method can evaluate the lens accurately in a design process, design parameters are adjusted according to the evaluation result and by combining actual processing errors, and processing is performed again, so that the processing rejection rate can be decreased, the product yield is increased, and industrial popularization and application are facilitated.

Description

technical field [0001] The invention relates to an evaluation method of a free-form lens and a design and processing method thereof, in particular to an evaluation method of a high-curvature large-diameter free-form lens and a design and processing method thereof. Background technique [0002] Freeform surface technology is the technology used for surface processing of asymmetric complex optical design. Over the years, this technology has been widely used in the international high-end ophthalmic lens industry. At present, international first-class brand lens manufacturers have launched a variety of free-form lenses with different design principles according to their own technical characteristics and market needs. Free-form lenses are mainly represented by aspherical lenses and progressive multi-focal lenses. In actual processing, it is found that there are certain difficulties in the design and processing of high curvature and large aperture free-form surface lenses. In o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02C7/02
Inventor 秦琳玲陈晓羿余浩墨
Owner SUZHOU UNIV
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