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Design method and lens group of progressive power lens

A design method and lens technology, applied in the directions of glasses/goggles, optics, optical components, etc., can solve the problems of large changes in the add-on power, deterioration of aberration distribution, deterioration of optical performance, etc.

Active Publication Date: 2019-06-14
HOYA LENS THAILAND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, since the prescribed underaddition varies depending on the wearer, there are problems in the case where the prescribed underaddition is small: the change in the underaddition from the start point of the progressive band to the vicinity of the fitting point is large, like Deterioration of differential distribution, deterioration of optical performance

Method used

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  • Design method and lens group of progressive power lens
  • Design method and lens group of progressive power lens
  • Design method and lens group of progressive power lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] exist figure 2 Example 1 is shown in .

[0080] exist figure 2, it shows that the first diopter D1 is fixed at 4.00 diopters (D), and the prescription addition ADD is set from 0.50 diopters (D) to 3.50 diopters (D) with a difference of 0.25 diopters (D). In a progressive power lens, the relationship between the position on the main meridian and the dioptric power. In the case where the ADD under the prescription is 0.50 diopters (D), the second dioptric power D2 is 3.50 diopters (D), and under the condition that the ADD under the prescription is 3.50 diopters (D), the second dioptric power D2 is 0.50 diopters (D). which is, figure 2 The lens set shown in is mainly intended for indoor use and is suitable for medium-near lenses for viewing medium distances (about 3m to about 5m) to close at hand. In intermediate and near lenses, it is possible to continuously view intermediate distances to near distances by moving the line of sight up and down.

[0081] In Exampl...

Embodiment 2

[0094] exist Figure 4 Example 2 is shown in .

[0095] Compared with Example 1, the target addition FAD is different in Example 2, and the other conditions are the same as in Example 1.

[0096] In Example 2, the target distance d is 1 m, and the target addition FAD is 1.00 diopters.

[0097] In the case where the prescribed addition ADD is 0.50 diopters (D), the addition MAD at the position corresponding to the fitting point FP is 0.20 diopters (D), and the target addition FAD is 1.00 diopters (D) bigger.

[0098] In the case where the prescription addition ADD is 2.25 diopters (D), the addition addition MAD at the position corresponding to the fitting point FP is {A / (A+B)}×ADD=0.4×2.25=0.90 diopters (D), the 1.00 diopter (D) of the target addition FAD is relatively large.

[0099] In the case where the prescription addition ADD is 2.50 diopters (D), the addition addition MAD at the position corresponding to the fitting point FP is {A / (A+B)}×ADD=0.4×2.50=1.00 diopters (...

Embodiment 3

[0108] exist Figure 6 Example 3 is shown in .

[0109] exist Figure 6 In the figure, it shows that the first diopter D1 is fixed at 4.00 diopters (D), and the prescribed addition ADD is set from 1.00 diopters (D) to 2.50 diopters (D) with a sequential difference of 0.25 diopters (D). In progressive power lenses, the relationship between the position on the main meridian and the dioptric power. The principal meridian C of the first area 1A is on the Y axis, and the fitting point FP is at the position of O which is the origin of the Y axis.

[0110] In the case where the ADD under the prescription is 1.00 diopters (D), the second dioptric power D2 is 3.00 diopters (D), and under the condition that the ADD under the prescription is 2.50 diopters (D), the second dioptric power D2 is 1.50 diopters (D).

[0111] In Example 3, the target distance d is 2 m, and the target addition FAD is 0.50 diopters. Set dimension A to 8mm and dimension B to 12mm.

[0112] In the case where ...

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Abstract

In the case where the lower addition (MAD) of the position corresponding to the fitting point (FP) in the prescription lower addition (ADD) is greater than the target lower addition (FAD) set according to the target distance, the target Additive power (FAD) is set to the lower additive power between the asymptotic start point (PS) and the asymptotic end point (PE) in the main meridian, and is set to the asymptotic start point (PS) and the fitting point (FP) The mean gradient of the lower add power between is different from the mean gradient of the lower add power between the Fit Point (FP) and the Progressive End Point (PE). Asymptotic start point in the prime meridian if the prescribed subaddition (ADD) at the location corresponding to the fitting point (FP) has an inferior additon (MAD) less than or equal to the target subaddition (FAD) The gradient of the down-addition power is made constant in a partial region including at least the fitting point (FP) between the (PS) and the progressive end point (PE).

Description

technical field [0001] The invention relates to a design method of a progressive diopter lens and a lens group. Background technique [0002] In addition to single focus lenses, there are progressive dioptric power lenses in spectacle lenses. [0003] As a conventional progressive power lens, there is a spectacle lens having a progressive zone in which the radius of curvature gradually changes along a principal meridian passing through the approximate center of the lens, between the distance center and the near center on the principal meridian There is a prescribed downlight addition between them (Patent Document 1). [0004] In the progressive power lens of Patent Document 1, a fitting point is set between the starting point and the ending point of the progressive zone, and the average gradient of the added power from the starting point of the progressive zone to the vicinity of the fitting point is the same as that from the fitting point. The average gradient of the addi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02C7/06
CPCG02C7/06G02C7/065G02C7/025G02C7/027G02C7/028G02C7/061
Inventor 浅见博伊藤步
Owner HOYA LENS THAILAND LTD