CN214954391U - Double-sided composite aspheric lens and preparation mold thereof - Google Patents

Double-sided composite aspheric lens and preparation mold thereof Download PDF

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CN214954391U
CN214954391U CN202121501506.2U CN202121501506U CN214954391U CN 214954391 U CN214954391 U CN 214954391U CN 202121501506 U CN202121501506 U CN 202121501506U CN 214954391 U CN214954391 U CN 214954391U
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diopter
aspheric
lens
astigmatism
double
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余浩墨
陈晓翌
冯涛
李德
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Jiangsu Mingshi Optical Technology Co ltd
Suzhou Mingshi Optical Technology Co ltd
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Jiangsu Mingshi Optical Technology Co ltd
Suzhou Mingshi Optical Technology Co ltd
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Abstract

The utility model provides a two-sided compound aspheric surface lens and preparation mould thereof. The lens comprises a central visual field area, an oblique vision astigmatism optimization area and a cosmetic thinness control area; in the central vision field area and the strabismus astigmatism optimization area, the astigmatism of the spectacle lens formed by compounding two surfaces is obviously lower than the diopter variable quantity through diopter reduction amount control and astigmatism optimization of one surface and reverse offset of astigmatism of the other surface, and the strabismus astigmatism is obviously reduced; in the cosmetic thinning functional area, the cosmetic thinning effect of thinning the edge or reducing the middle thickness of the spectacle lens formed by compounding the two surfaces is obviously enhanced through the fact that the diopter of one surface is accelerated to be reduced and the diopter of the other surface is increased from the reduction direction. The double-sided composite spectacle lens provided by the utility model not only has the appearance characteristics of light weight, thinness and flatness, but also keeps enough wearing comfort and adaptability.

Description

Double-sided composite aspheric lens and preparation mold thereof
Technical Field
The utility model relates to a two-sided compound aspheric surface lens and preparation mould thereof.
Background
Although the spectacle lens is designed and processed into an integral face type, the use functions of each area of the spectacle lens are different in the actual use process. In the 35-degree field angle of the wearer, the corresponding lens is taken as a central field area within the 20 mm caliber range, and is directly related to the definition of an object to be viewed and the adaptability of wearing glasses; the 20 mm to 50 mm caliber range is an oblique object viewing area, and the astigmatism of the area is related to the peripheral visual effect of the object viewed by a wearer, so that the comfort and adaptability of wearing the glasses are influenced. The thickness control area is from the aperture of 50 mm to the edge of the lens, and the design requirement achieves the aim of making the lens thin and light. The existing aspheric lens or double-sided aspheric lens does not relate to a partition design concept with clear optical performance and cosmetic function, if the optical performance of the whole lens is considered when designing the aspheric lens, the flat and thin beautiful effect cannot be considered to a great extent, the astigmatism is gradually increased along with the reduction of the design thickness of the lens when designing the double-sided aspheric lens, and the cosmetic effect is achieved while a part of peripheral visual effect is usually sacrificed. In addition, in the prior art, the aspheric lenses produced in mass production by mold casting are designed according to the theoretical value of parallel light incidence imaging on the far-point spherical surface of the retina, and when the spectacle frame of a wearer deviates from the theoretical design position, the aspheric lenses are often uncomfortable due to the deviation of compensatory astigmatism, and in severe cases, the aspheric lenses are not as comfortable as the spherical lenses.
Disclosure of Invention
The utility model discloses not enough to prior art exists, provide a lens that adopts two compound matchs of aspheric surface to constitute and preparation mould thereof, the lens possesses optical property and the clear subregion of beautiful thin function, and the astigmatic variable quantity in district is looked to the slant is showing and is being less than the diopter variable quantity, and thickness control district reaches the flat thin effect of lens, makes the lens lighter for traditional aspheric lens, thin, under the prerequisite of flat outward appearance advantage, still keeps sufficient wearing travelling comfort and adaptability.
The technical scheme for realizing the purpose of the utility model is to provide a double-sided compound aspheric lens, one surface of which is an aspheric surface type P surface, the other surface is an aspheric surface type W surface, and the central curvature of the P surface is less than the W surface;
in the spectacle lens, a circular area from the center of the spectacle lens to the caliber equal to 20 mm is a central view field area, an annular area from the caliber larger than 20 mm to the caliber equal to 50 mm is an oblique astigmatism optimization area, and an annular area from the caliber larger than 50 mm to the edge of the spectacle lens is an American thin control area;
the astigmatism of each part of the lens is smaller than the absolute value of diopter variation at the same position; from the center of the lens to the outside, the diopter absolute value is decreased, and the difference between the diopter variation absolute value and the astigmatism of the lens is increased;
the surface diopter change of the P surface is gradually reduced at a constant speed and then gradually increased from the center to the outside, and the inflection point appears in the caliber of 52-56 mm; the astigmatism is larger than the diopter variation absolute value from the center to the outer part of the aperture of 40 mm;
the change rate of the surface diopter of the W surface is greater than that of the P surface diopter; the diopter of the surface decreases progressively at a constant speed from the center to the caliber of 50 mm, and the diopter decreasing rate increases from the caliber of 50 mm to the outside; at the aperture of 40mm, the diopter variation absolute value is 0.10-0.20 of the central diopter;
the astigmatism of each position of the W surface is smaller than the absolute value of diopter variation at the same position;
the aspheric surface type P surface and the aspheric surface type W surface are aspheric surfaces with even-order terms.
The utility model provides a double-sided compound aspheric lens, which takes an aspheric P surface as a front surface and an aspheric W surface as a rear surface to form a double-sided compound aspheric myopia lens; or the aspheric surface W surface is used as the front surface, and the aspheric surface P surface is used as the rear surface to form the double-sided compound aspheric far-vision spectacle lens.
The technical proposal of the utility model also comprises a mould for preparing the double-sided compound aspheric lens, the mould is a glass mould for casting resin lens, and comprises a concave mould base with a working surface of an aspheric P surface and a convex mould base with a working surface of an aspheric W surface; or comprises a concave die holder with an aspheric W surface and a convex die holder with an aspheric P surface. Double-sided composite aspheric lens
In the present invention, the diopter of each position of the lens is the average value of the maximum diopter value and the minimum diopter value of the lens in different directions; the diopter variation quantity of each position of the lens is the diopter value of the position of the lens minus the diopter value of the center of the lens; the diopter of the P surface and the W surface is the product of the average value of two main curvatures at a certain position of the surface multiplied by the refractive index minus 1 of the lens material, and the main curvature is larger than zero and is a positive diopter value.
According to the technical scheme of the utility model, the myopia glasses lens is composed of a front surface with smaller curvature and a rear surface with larger curvature, the absolute value of the negative diopter is reduced from the center to the outside, and the myopia degree is reduced; the far-vision spectacle lens is composed of a front surface with a large curvature and a rear surface with a small curvature, wherein the positive diopter is reduced from the center to the outside, and the far-vision diopter is reduced.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. the utility model discloses a subregion design concept, 20 millimeters bore within range are central visual field region, and 20 millimeters to 50 millimeters bore ranges look the object region for the slant, and these two regions are guaranteed and are openly looked object and slant and look definition and comfort level of object. The caliber of 50 mm to the edge of the lens is a thinning functional area, aiming at reducing the edge thickness or the middle thickness of the lens. The designed lens has clear functions in all areas, good optical performance and visual effect, and light and thin appearance.
2. The front and back surfaces of the lens are aspheric surfaces with special requirements, wherein a relatively flat surface P surface is gradually flattened from the center to the outside, a relatively curved surface is gradually flattened from the center to the outside, and the flattening speed is far higher than that of the P surface, so that the edge of the formed myopia lens is thinned, the edge of the formed far vision lens is thick, the central thickness can be reduced, and the light and thin effect of the lens is achieved.
3. The front and back surfaces of the lens are gradually flattened from the center to the outside, the directions of the astigmatism of the front and back surfaces caused by diopter change are consistent, the astigmatism values of the front and back surfaces of the lens are subtracted, the astigmatism is mutually buffered, the astigmatism of a visual function area is reduced, the astigmatism of the P surface from the center to the outside of a 40mm caliber is larger than the diopter change, and the astigmatism buffering effect is further increased.
4. Both the front and back surfaces of the lens are flattened from the center outward, actually adversely affecting the cosmetic function of the lens. To overcome this weakness, the P-surface with a smaller curvature (flatter) is designed to have an inflection point in the zone of cosmetic thinness (aperture 52-56 mm) and the diopter increases gradually after the inflection point to compensate for the effect on the cosmetic thinness of the lens due to the decrease in diopter.
Drawings
Fig. 1 is a schematic structural diagram of a double-sided composite aspheric spectacle lens according to an embodiment of the present invention;
in the figure, 1, a central view field region; 2. an oblique vision astigmatism optimization area; 3. a beauty and thinness control area;
fig. 2 is a radial variation curve diagram of the W-plane diopter variation absolute value and the astigmatism provided by the first embodiment of the present invention;
fig. 3 is a graph showing the variation of the P-plane diopter variation absolute value and the astigmatism along the radial direction according to the first embodiment of the present invention;
fig. 4 is a graph showing the variation of diopter and the variation of astigmatism along the radial direction of a double-sided composite aspheric near vision lens according to an embodiment of the present invention;
FIG. 5 is a schematic view of the thinning function of the double-sided composite aspheric myopia lens provided by the present invention;
fig. 6 is a radial variation curve diagram of the W-plane diopter variation absolute value and the astigmatism provided by the second embodiment of the present invention;
fig. 7 is a graph showing the variation of the P-plane diopter variation absolute value and the astigmatism along the radial direction according to the second embodiment of the present invention;
fig. 8 is a graph showing the variation of diopter and the variation of astigmatism along the radial direction of the double-sided compound aspheric near vision lens according to the second embodiment of the present invention;
fig. 9 is a radial variation curve diagram of the absolute value of diopter variation and the astigmatism of the double-sided compound aspheric surface telephoto mirror provided by the third embodiment of the present invention;
fig. 10 is a functional schematic diagram of the beauty thin double-sided compound aspheric surface televiewing mirror provided by the present invention.
Detailed Description
The technical solution of the present invention will be further described with reference to the accompanying drawings and examples.
Example one
The lens provided by the embodiment is as follows: 6.00D double-sided aspherical myopic lenses, with the P face of the central diopter value 0.75D with the smaller curvature as the anterior surface and the W face of the central diopter value 6.75D with the larger curvature as the posterior surface, the refractive index of the lens being 1.56 and the central thickness being 1.2 mm.
Referring to fig. 1, it is a schematic structural diagram of a double-sided compound aspheric myopic lens provided in this embodiment; the optical lens comprises a central view field region 1, an oblique vision astigmatism optimization region 2 and a cosmetic thinness control region 3; a circular area from the center of the lens to the caliber equal to 20 mm is a central visual field area, an annular area from the caliber larger than 20 mm to the caliber equal to 50 mm is a strabismus astigmatism optimization area, and an annular area from the caliber larger than 50 mm to the edge of the lens is an American thin control area.
The astigmatism of each part of the lens is smaller than the absolute value of diopter variation at the same position; from the center of the lens to the outside, the diopter absolute value is decreased, and the difference between the diopter variation absolute value and the astigmatism of the lens is increased;
the P surface of the lens is outward from the center, the surface diopter change of the lens is gradually increased after being gradually decreased at a constant speed, and the inflection point appears in the caliber of 52-56 mm; the astigmatism is larger than the diopter variation absolute value from the center to the outer part of the aperture of 40 mm;
the change rate of the surface diopter of the W surface of the lens is greater than that of the P surface diopter; the diopter of the surface decreases progressively at a constant speed from the center to the caliber of 50 mm, and the diopter decreasing rate increases from the caliber of 50 mm to the outside; at the aperture of 40mm, the diopter variation absolute value is 0.10-0.20 of the central diopter; and the astigmatism of each W surface is smaller than the absolute value of diopter change at the same position.
In this embodiment, the aspheric surface P surface and W surface are aspheric surfaces containing only even high-order terms, and the surface rise is determined by the following functional formula (1):
Figure DEST_PATH_IMAGE001
(1)
wherein,
Figure 983013DEST_PATH_IMAGE002
is the radial position coordinate of the lens;
Figure DEST_PATH_IMAGE003
is the central curvature of the aspheric surface;kconic coefficient which is aspherical;
Figure 493629DEST_PATH_IMAGE004
the coefficient of the even higher-order term of the aspheric surface.
In the present embodiment, the central curvature of the W face (rear face) is setC =12.054m-1(ii) a The diopter value at 40mm aperture is 5.90D (0.85D less than the central diopter value, varying by 0.126 of the central diopter). The diopter change characteristics of the W surface are as follows: the diopter of the surface decreases at a constant speed from the center to the caliber of 50 mm, the diopter decreasing rate increases from the caliber of 50 mm to the outside, and the aspheric cone coefficient is searched by adopting a mode search methodkAnd high even-order term aspheric coefficient
Figure DEST_PATH_IMAGE005
Obtaining the diopter variation absolute of the W surfaceThe variation of the values and the cylindrical power along the radial direction is shown in fig. 2. The diopter change, minus the central diopter value, at 40mm calibre is a negative value, with an absolute value of 0.9354D, which is 0.139 times the central diopter, with 50 mm calibre-initiated edge diopter acceleration reduction; the astigmatism is smaller than the diopter change.
Setting the center curvature of the P-plane (front surface)C =1.339m-1From the center to the outside, the surface diopter change is gradually decreased at a constant speed and then gradually increased, the inflection point is arranged at the aperture of 54 mm, and the astigmatism is greater than the diopter change absolute value within the aperture of 40 mm. The optimization design obtains the variation curve of the diopter variation absolute value and the astigmatism along the radial direction of the P surface as shown in figure 3. Diopter has an inflection point at 54 mm caliber, and the astigmatism is greater than the absolute value of diopter change from the center to the outer surface to 40mm caliber.
In this embodiment, the P surface is the front surface, the W surface is the back surface, and the variation curves of the astigmatism and the diopter change of the myopic lens along the radial direction are shown in fig. 4. The astigmatism of the lens formed by the P surface and the W surface is lower than that of the W surface because the astigmatism axes of the P surface and the W surface are consistent and the P surface and the W surface are mutually cancelled after subtraction. The specific data is that the diopter change at 40mm caliber is 0.8541D, which is 0.142 times the absolute value of the central diopter-6D.
The front surface of the myopic lens is flattened to be not beneficial to thinning the edge of the lens, and the embodiment adopts two measures to achieve the goal of lens thinning, namely, the rate of diopter decrease from the center of the lens to the outer side of the back surface W surface is greater than that of the front surface, namely, the surface flattening speed is far greater than that of the front surface; another measure is to design an inflection point at 54 mm caliber on the P surface of the front surface, the diopter increases from the inflection point to the edge, namely, the flattening of the lens is slowed down, and the combined myopic lens has thinner edge thickness. The thinning function schematic diagram of the double-sided compound aspheric near-sighted lens is shown in the attached figure 5.
Compared with the spherical lens with the same parameters (the central diopter of the front and back surfaces is the same, and the refractive index is the same), the thickness reduction of the lens at the aperture of 70 mm is 0.835 mm, and the reduction value of the thickness of the edge of the spherical lens is called as the thinning amount. The diopter change and astigmatism characteristic parameters of the lens of the embodiment are compared with those of a single-sided aspheric lens with the same front surface central diopter of 0.75D in the first table. The data in table one shows that, on the premise that the thinning amount of the double-sided compound aspheric near-sighted spectacle lens designed by overlapping and buffering on two sides is increased, although the diopter variation of the caliber of 40mm is increased, the effect that the astigmatism is superior to that of the traditional single-sided aspheric lens is achieved.
Watch 1
Figure DEST_PATH_IMAGE007
In the preparation of the double-sided composite spectacle lens designed in this embodiment, a resin lens is cast by a glass mold and directly cured and molded or a semi-finished product is cast and molded by grinding and processing the rear surface. The glass die comprises a P die holder and a W die holder. The double-sided composite aspheric myopia spectacle lens is cast by a die combined by a concave die holder with a P-shaped working surface and a convex die holder with a W-shaped working surface.
Example two
A piece of 6.00D double-sided aspheric near-sighted lens is designed, the same as the first embodiment is carried out, the P surface with the central diopter value of 0.75D is the front surface, the W surface with the central diopter value of 6.75D is the rear surface, the refractive index of the lens is 1.56, and the central thickness is 1.2 mm.
The specific optimization setup and embodiment one are changed as follows: the diopter change of the W surface 40mm aperture is increased from 0.85D to 1.2D, and the diopter change of the P surface 40mm aperture is slightly decreased by 0.015D. The designed variation curve of the W surface (back surface) diopter variation absolute value and the astigmatism along the radial direction is shown in figure 6, the diopter variation absolute value at the aperture of 40mm is 1.234D, which is 0.182 times of the central diopter, and the aperture of 50 mm plays the role of edge diopter acceleration reduction; the astigmatism is smaller than the diopter change. The absolute value of the P-plane (front surface) diopter change and the change curve of the astigmatism along the radial direction are designed as shown in fig. 7. The diopter change and the astigmatism of the double-sided composite aspheric near-vision lens along the radial variation curve are shown in figure 8, and the specific data is that the diopter change at the caliber of 40mm is 1.179D, which is 0.197 times of the absolute value of the central diopter-6D. From the center outward, the astigmatism throughout the lens is less than the diopter change.
The amount of diopter change and the astigmatism of the conventional double-sided aspheric surface having the same aperture reduction amount of 70 mm as that of the present embodiment are compared in table two.
Watch two
Figure DEST_PATH_IMAGE009
The double-sided compound aspheric lens designed by the two-sided superposition buffer design has the same 70 mm caliber thinning-out amount of 1.1 mm as the traditional double-sided aspheric lens, but the diopter variation of 40mm caliber and the astigmatism of 30 and 40mm caliber are smaller than those of the traditional double-sided aspheric lens, and the performance of the double-sided compound aspheric lens in a central visual field area or a peripheral oblique visual area is superior to that of the traditional single-sided aspheric lens.
EXAMPLE III
This example provides a 6.00D piece of double-sided compound aspheric presbyopic lens designed with a central diopter value of 6.75D on the W side as the front surface, a central diopter value of 0.75D on the P side as the back surface, a refractive index of 1.56, and a central thickness of 5.88 mm.
The P surface and the W surface are designed according to the second technical solution of the embodiment, and the absolute value of diopter variation and the variation curve of astigmatism along the radial direction, which are compounded to form the double-sided aspheric far vision lens, are as shown in fig. 9, and the variation form of the curve corresponding to the double-sided compounded aspheric near vision lens of the embodiment shown in fig. 8 is completely the same. The rate of power reduction of the double-sided compound aspheric distance vision lens is much greater on the anterior (W-side) than on the posterior (P-side) side, which thickens the edge of the lens, as shown in figure 10. By adopting the technical scheme of the embodiment, the center thickness can be reduced under the condition of ensuring that the edge thickness reaches 1 mm or 1.5 mm, so that the weight of the spectacle lens can be reduced. Under the condition that the thickness of the aperture side of 60 mm is 1.5 mm, the central thickness of the spherical lens formed by the same central diopter of the front surface and the back surface reaches 6.51 mm, while the central thickness of the far vision lens of the embodiment can be reduced by 0.63 mm to 5.88 mm.
In the preparation of the double-sided composite aspheric far vision spectacle lens designed by the embodiment, the resin lens is cast by a glass mold and directly cured and molded or a semi-finished product is cast and processed and molded by grinding the rear surface. The glass die comprises a P die holder and a W die holder. The double-sided composite aspheric far vision spectacle lens is cast by a die combined by a concave die holder with a W-shaped working surface and a convex die holder with a P-shaped working surface.

Claims (3)

1. A double-sided compound aspheric surface spectacle lens is characterized in that: one surface of the device is an aspheric surface P surface, the other surface of the device is an aspheric surface W surface, and the central curvature of the P surface is smaller than that of the W surface;
in the spectacle lens, a circular area from the center of the spectacle lens to the caliber equal to 20 mm is a central visual field area (1), an annular area from the caliber larger than 20 mm to the caliber equal to 50 mm is a squint astigmatism optimization area (2), and an annular area from the caliber larger than 50 mm to the edge of the spectacle lens is a cosmetic thinness control area (3);
the astigmatism of each part of the lens is smaller than the absolute value of diopter variation at the same position; from the center of the lens to the outside, the diopter absolute value is decreased, and the difference between the diopter variation absolute value and the astigmatism of the lens is increased;
the surface diopter change of the P surface is gradually reduced at a constant speed and then gradually increased from the center to the outside, and the inflection point appears in the caliber of 52-56 mm; the astigmatism is larger than the diopter variation absolute value from the center to the outer part of the aperture of 40 mm;
the change rate of the surface diopter of the W surface is greater than that of the P surface diopter; the diopter of the surface decreases progressively at a constant speed from the center to the caliber of 50 mm, and the diopter decreasing rate increases from the caliber of 50 mm to the outside; at the aperture of 40mm, the diopter variation absolute value is 0.10-0.20 of the central diopter;
the astigmatism of each position of the W surface is smaller than the absolute value of diopter variation at the same position;
the aspheric surface type P surface and the aspheric surface type W surface are aspheric surfaces with even-order terms.
2. The double-sided compound aspheric ophthalmic lens as defined in claim 1, characterized in that: the aspheric P surface is used as the front surface, and the aspheric W surface is used as the rear surface to form the double-sided compound aspheric myopia spectacle lens; or the aspheric surface W surface is used as the front surface, and the aspheric surface P surface is used as the rear surface to form the double-sided compound aspheric far-vision spectacle lens.
3. A mold for manufacturing the aspherical double-sided composite lens according to claim 1, which is a glass mold for molding a cast resin lens, wherein: the die comprises a concave die holder with an aspheric P surface and a convex die holder with an aspheric W surface; or comprises a concave die holder with an aspheric W surface and a convex die holder with an aspheric P surface.
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