FRONT CURVE DESIGN METHOD FOR PREPARING RESIN LENS WITH HIGH REFRACTIVE INDEX

Abstract

A front curve design method for preparing a resin lens with a high refractive index. The method includes within a myopia power range of −1.00 to −15.00, designing the maximum design front curve to be −4.00 D from −1.00 to −3.50; designing the maximum design front curve to be −3.00 D from −3.75 to −5.50; designing the maximum design front curve to be −2.00 D from −5.75 to −8.75; and designing the maximum design front curve to be −1.50 D from −9.00 to −15.00. The method of the present invention is mainly suitable for resin lenses with a refractive index of 1.60, 1.67 or 1.74.

Claims

1. A front curve design method for preparing a resin lens with a high refractive index, comprising within a myopia power range of −1.00 to −15.00, designing the maximum design front curve to be −4.00 D from −1.00 to −3.50; designing the maximum design front curve to be −3.00 D from −3.75 to −5.50; designing the maximum design front curve to be −2.00 D from −5.75 to −8.75; and designing the maximum design front curve to be −1.50 D from −9.00 to −15.00.

2. The front curve design method for preparing a resin lens with a high refractive index according to claim 1, wherein the maximum design front curve is the curve of a geometric center point of a lens.

3. The front curve design method for preparing a resin lens with a high refractive index according to claim 1, wherein the front curve design is used for a spherical lens, an aspheric lens or a multifocal lens.

4. The front curve design method for preparing a resin lens with a high refractive index according to claim 1, wherein the resin lens with a high refractive index is a lens with a refractive index of 1.60, 1.67 or 1.74.

5. The front curve design method for preparing a resin lens with a high refractive index according to claim 4, wherein the lens with a refractive index of 1.60 comprises a mixture of 2,5 (or 2,6)-bis(isocyanatomethyl)bicyclo[2.2.1]heptane, hexamethylene diisocyanate, pentaerythritol tetra(3-mercaptopropionate), and 4-mercaptomethyl-3,6-dithia-1,8-octanedithiol as a monomer and an organotin catalyst as a catalyst.

6. The front curve design method for preparing a resin lens with a high refractive index according to claim 4, wherein the lens with a refractive index of 1.67 comprises 1,3-bis(isocyanatomethyl)benzene and bis(mercaptomethyl)-3,6,9-trithiaundecane-1,11-dithiol as a monomer and an organotin catalyst as a catalyst.

7. The front curve design method for preparing a resin lens with a high refractive index according to claim 4, wherein the lens with a refractive index of 1.74 comprises bis(2,3-epithiopropyl)disulfide and bis(mercaptomethyl)-3,6,9-trithiaundecane-1,11-dithiol as a monomer and an amine catalyst as a catalyst.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 shows schematic structural diagrams of two resin lenses in Example 1 of the present invention.

[0017] FIG. 2 shows an SEQ diagram and a CYL diagram of the two resin lenses in Example 1 of the present invention.

[0018] FIG. 3 shows schematic structural diagrams of two resin lenses in Example 2 of the present invention.

[0019] FIG. 4 shows an SEQ diagram and a CYL diagram of the two resin lenses in Example 2 of the present invention.

[0020] FIG. 5 shows schematic structural diagrams of two resin lenses in Example 3 of the present invention.

[0021] FIG. 6 shows an SEQ diagram and a CYL diagram of the two resin lenses in Example 3 of the present invention.

[0022] FIG. 7 shows a value range of front curve of a resin lens with the change of power in the design method of the present invention.

DETAILED DESCRIPTION

[0023] The following further describes the present invention in detail with reference to the accompanying drawings. The following embodiments are only used to describe the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0024] In the present invention, a resin lens with a refractive index of 1.67 is selected and prepared into two lenses with the same power and different front curves. SEQ and CYL of the lenses are tested respectively, and results are as follows.

Example 1

[0025] Two resin lenses with a refractive index of 1.67, the power of −3.00 and different front curves were shown in FIG. 1. Parameters were shown in Table 1. The SEQ and CYL of the lenses were tested respectively, as shown in FIG. 2.

TABLE-US-00001 TABLE 1 Two resin lenses with a refractive index of 1.67, the power of −3.00 and different front curves BC(D) R.sub.1 R.sub.2 P.sub.1(D) P.sub.2(D) n = 1.530 (mm) (mm) n = 1.667 n = 1.667 t.sub.edg(mm) 1.58 335.44 133.60 1.99 −4.99 4.64 4 132.50 82.74 5.03 −8.06 4.86

[0026] In the table: BC is base curve, R1 and R2 are semicircle diameters based on two roundnesses, P1 is front curve, P2 is back curve (the refractive index used in the test was 1.667), t is the edge thickness of the lens, and 667/530*BC=P1.

[0027] As shown in FIG. 2, the smaller the SEQ of the resin lens with the design curve of −4.00 D, the better the CYL.

Example 2

[0028] Two resin lenses with a refractive index of 1.67, the power of −4.25 and different front curves were shown in FIG. 3. Parameters were shown in Table 2. The SEQ and CYL of the lenses were tested respectively, as shown in FIG. 4.

TABLE-US-00002 TABLE 2 Two resin lenses with a refractive index of 1.67, the power of −4.25 and different front curves BC(D) R.sub.1 R.sub.2 P.sub.1(D) P.sub.2(D) n = 1.530 (mm) (mm) n = 1.667 n = 1.667 t.sub.edg(mm) 1.38 384.06 111.35 1.74 −5.99 5.85 3 176.67 82.95 3.78 −8.04 6.04

[0029] In the table: BC is base curve, R1 and R2 are semicircle diameters based on two roundnesses, P1 is front curve, P2 is back curve (the refractive index used in the test was 1.667), t is the edge thickness of the lens, and 667/530*BC=P1.

[0030] As shown in FIG. 4, the smaller the SEQ of the resin lens with the design curve of −3.00 D, the better the CYL.

Example 3

[0031] Two resin lenses with a refractive index of 1.67, the power of −8.50 and different front curves were shown in FIG. 5. Parameters were shown in Table 3. The SEQ and CYL of the lenses were tested respectively, as shown in FIG. 6.

TABLE-US-00003 TABLE 3 Two resin lenses with a refractive index of 1.67, the power of −8.50 and different front curves BC(D) R.sub.1 R.sub.2 P.sub.1(D) P.sub.2(D) n = 1.530 (mm) (mm) n = 1.667 n = 1.667 t.sub.edg(mm) 0.58 913.79 72.26 0.73 −9.23 10.17 2 265.00 60.51 2.52 −11.02 10.63

[0032] In the table: BC is base curve, R1 and R2 are semicircle diameters based on two roundnesses, P1 is front curve, P2 is back curve (the refractive index used in the test was 1.667), t is the edge thickness of the lens, and 667/530*BC=P1.

[0033] As shown in FIG. 6, the smaller the SEQ of the resin lens with the design curve of 2 was smaller, the better the CYL.

Example 4

[0034] A spherical lens with a refractive index of 1.60 included a mixture of 2,5 (or 2,6)-bis(isocyanatomethyl)bicyclo[2.2.1]heptane, hexamethylene diisocyanate, pentaerythritol tetra(3-mercaptopropionate) and 4-mercaptomethyl-3,6-dithia-1,8-octanedithiol as a monomer and an organotin catalyst as a catalyst. The front curve of a geometric center point of the lens with the change of power was shown in FIG. 7.

Example 5

[0035] An aspheric lens with a refractive index of 1.67 included 1,3-bis(isocyanatomethyl)benzene and bis(mercaptomethyl)-3,6,9-trithiaundecane-1,11-dithiol as a monomer and an organotin catalyst as a catalyst. The front curve of a geometric center point of the lens with the change of power was shown in FIG. 7.

Example 6

[0036] An aspheric lens with a refractive index of 1.74 included bis(2,3-epithiopropyl)disulfide and bis(mercaptomethyl)-3,6,9-trithiaundecane-1,11-dithiol as a monomer and an amine catalyst as a catalyst. The front curve of a geometric center point of the lens with the change of power was shown in FIG. 7.

[0037] The foregoing descriptions are only exemplary implementations of the present invention. A person of ordinary skill in the art may make some improvements and variations without departing from the technical principle of the present invention and the improvements and variations shall fall within the protection scope of the present invention.