Contact lens die and contact lens

Abstract

The invention relates to a contact lens mold which comprises a male mold and a female mold. The male die comprises a male base and a protruding part protruding outwards from the central axis of the male base, and at least one locating pin part protruding outwards in the radial direction is formed in the circumferential direction of the male base. The female die comprises a female base and a concave part which is axially concave inwards from the center of the female base. The female base comprises a first subarea and a second subarea which are sequentially distributed in the circumferential direction of the female base, and N first positioning groove parts are formed in the first subarea; n-1 first positioning groove parts are formed in the first subarea, N-1 second positioning groove parts are formed in the second subarea, the circumferential distance between every two adjacent first positioning groove parts and the circumferential distance between every two adjacent second positioning groove parts are both 180 degrees / N, the circumferential distance between every two adjacent first positioning groove parts and second positioning groove parts is 540 degrees / (2N), and the concave part is of a symmetrical structure. The contact lens mold has the characteristics of convenience in operation and accuracy in positioning.

Description

Technical Field

[0001] This disclosure relates to the field of manufacturing ophthalmic devices, and more particularly to a contact lens mold and a contact lens, which are designed to enable the simple and precise fabrication of a contact lens with astigmatism correction function. Background Technology

[0002] Due to both congenital and acquired factors, the human eye is usually unable to focus parallel light rays from infinity, forming two focal lines along different meridians. This condition is called "astigmatism." Astigmatism primarily manifests as decreased vision and eye strain. The degree of visual impairment is related to the type, degree, and axis of astigmatism: physiological astigmatism usually does not affect vision; high astigmatism is often accompanied by amblyopia, making correction difficult; mild astigmatism can easily lead to eye strain due to long-term compensatory movements (such as squinting or torticollis), while high astigmatism, due to the inability to self-accommodate, often results in milder symptoms. External factors such as frequent eye rubbing can alter the curvature of the lower cornea, increasing the risk of astigmatism, especially in adolescents. Due to the prevalence of astigmatism, various methods exist to correct / treat it, as follows: 1. Corneal laser surgery. This type of surgery mainly includes excimer laser refractive keratomileusis (LASIK), laser-assisted subepithelial keratomileusis (LASIK), and femtosecond laser-assisted small incision lenticule extraction (LASIK). These surgeries correct astigmatism by reshaping the cornea. Surgical treatments are usually performed incidentally alongside refractive surgery.

[0003] 2. Intraocular lens implantation or replacement surgery is divided into two types: ICL and IOL. ICL involves implanting an additional lens to correct myopia, astigmatism, and other problems without removing the original lens of the eye. IOL, on the other hand, replaces the original lens and is usually accompanied by cataract treatment.

[0004] 3. Lens correction. Currently, the most widespread and the choice for most people is wearing eyeglasses, including spectacles, rigid gas permeable (RWP) contact lenses, and soft hydrophilic contact lenses.

[0005] Soft hydrophilic contact lenses are one of the most comfortable and convenient treatments for astigmatism, typically used for low to moderate corneal astigmatism. Because soft hydrophilic contact lenses involve many parameters such as refractive power, astigmatism power, and astigmatic axis, the most common manufacturing process is currently the cutting method. However, the cutting method is time-consuming and inefficient, resulting in high lens costs and difficulties in widespread adoption.

[0006] Some companies have developed a molding process for astigmatic lenses, primarily involving setting the optical area of ​​the male mold to be non-rotationally symmetric with two radii of curvature; while the optical area of ​​the female mold is positioned with either thinned top and bottom or with a bottom-heavy configuration. In this method, workers need to select male molds for different astigmatism levels and manipulate the different deflection angles when the male and female molds are joined to determine different astigmatism powers and axes. However, in current molding astigmatic lens manufacturing, the determination of the astigmatic axis mainly relies on the angular deflection of the mold-joining equipment, which is highly susceptible to deviations and errors in the astigmatic axis, resulting in significant waste.

[0007] In view of this, it is necessary to provide a new type of mold to improve the current situation.

[0008] Public content In view of the above-mentioned situation in the preparation of contact lenses according to the prior art, one of the objectives of this disclosure is to provide a contact lens mold that is easy to operate and improves the production accuracy and efficiency of contact lenses.

[0009] This objective is achieved by disclosing a contact lens mold of the following form for preparing a contact lens used to correct astigmatism. The contact lens mold includes: A male mold includes a male base and a protrusion projecting axially from the central axis of the male base. The male base has at least one radially outwardly projecting locating pin portion formed thereon. The outer surface of the protrusion is used to form the inner surface of the contact lens. The female mold includes a female base and a recessed portion axially recessed from the center of the female base. The inner surface of the recessed portion is used to form the outer surface of the contact lens. The female base includes a first section and a second section distributed sequentially in its circumference. The first section forms N first positioning grooves; the second section forms N-1 second positioning grooves. The circumferential spacing between adjacent first positioning grooves and the circumferential spacing between adjacent second positioning grooves are both 180° / N. The shapes of the first positioning grooves and the second positioning grooves are matched with the positioning pins, respectively. The circumferential spacing between adjacent first positioning grooves and second positioning grooves is: 540° / (2 N), Where N is set to ensure that 180° / N is an integer, Furthermore, the inner surface of the recess is symmetrical with respect to at least one radial plane.

[0010] Unlike conventional mechanical manufacturing, where positioning designs are strictly based on equal spacing, the positioning grooves in the mold are not equally spaced in the design described in this application. This allows the mold to achieve more accurate positioning with a smaller number of positioning grooves.

[0011] Preferably, the male mold includes a pair of locating pins, and the circumferential spacing between the pairs of locating pins is: (180°) (2) N-1)) / (2 N).

[0012] Preferably, the outer surface of the protrusion defines a first radial plane at the position of its maximum surface curvature radius, and the circumferential center of at least one of the locating pins is coplanar with the first radial plane.

[0013] Preferably, the outer surface of the protrusion defines the astigmatism function of the contact lens, and the inner surface of the concave portion defines the positioning function of the contact lens.

[0014] Preferably, the master mold includes a scale for characterizing the circumferential positions of the first positioning groove and the second positioning groove, wherein the scale is marked at a position corresponding to the temporal or nasal side in the horizontal direction of the human eye as 0°, and the scale is marked with a maximum interval of 180° / N within the first and second partitions.

[0015] Preferably, a Cartesian coordinate system is defined on the master mold based on the 0° mark. The range of 0° to 180° is marked on the +Y axis region of the Cartesian coordinate system, with the graduations increasing counter-clockwise. Similarly, the range of 0° to 180° is marked on the -Y axis region of the Cartesian coordinate system, with the graduations increasing counter-clockwise. The boundary between the first partition and the second partition is located at 135° and 315° in the Cartesian coordinate system, or at 45° and 225° in the Cartesian coordinate system.

[0016] Preferably, the positioning pin includes a main positioning pin and an auxiliary positioning pin that is radially opposite to the main positioning pin, wherein the radial length of the main positioning pin is greater than the radial length of the auxiliary positioning pin.

[0017] Preferably, the radial length of the main locating pin is 1.5 to 2.5 times the radial length of the auxiliary locating pin.

[0018] Preferably, the circumferential width of the locating pin portion is not equal in the radial direction of the male base.

[0019] Preferably, in the radially outward direction of the male base, the circumferential width of the locating pin gradually increases or is distributed in a wavy shape.

[0020] Preferably, the width of the first positioning groove and / or the second positioning groove gradually decreases from the groove surface to the groove bottom.

[0021] In addition, this disclosure also relates to a contact lens made based on any of the above-mentioned contact lens molds.

[0022] Based on common knowledge in the field, the above-mentioned preferred embodiments can be combined arbitrarily to obtain various preferred examples of this disclosure.

[0023] In the contact lens mold designed in this disclosure, thanks to the specially designed and mutually matching locating pins and locating grooves on the male and female molds respectively, operators or machines can quickly and accurately align the male and female molds. This improves the production efficiency of contact lenses. Attached Figure Description

[0024] To better understand the above and other objects, features, advantages, and functions of this disclosure, reference can be made to the preferred embodiments shown in the accompanying drawings. Like reference numerals in the drawings refer to like parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of this disclosure and are not intended to limit the scope of this disclosure; the parts in the drawings are not drawn to scale.

[0025] Figure 1 This is a schematic diagram of the overall structure of the male mold according to a first preferred embodiment of the contact lens mold of this disclosure.

[0026] Figure 2 yes Figure 1 Top view.

[0027] Figure 3 This is a top view of the male mold of the second preferred embodiment of the contact lens mold disclosed herein.

[0028] Figure 4 This is a top view of the master mold according to a first preferred embodiment of the contact lens mold of this disclosure.

[0029] Figure 5 It is along Figure 4 A perspective view along the AA direction.

[0030] Figure 6 It has graduations. Figure 4 A schematic diagram of the master mold.

[0031] Figure 7 This is a top view of the master mold according to a second preferred embodiment of the contact lens mold of the present disclosure.

[0032] Figure 8 yes Figure 4 A magnified view of a portion of the image.

[0033] Figure 9 This is a schematic diagram of the overall structure of a contact lens mold according to a preferred embodiment of the present disclosure.

[0034] Figure 10 yes Figure 9 A sectional view of the radial plane.

[0035] Figure 11 This is a top view of the contact mirror mold with the male and female molds in the first positioning position (0°).

[0036] Figure 12 This is a top view of the contact mirror mold with the male and female molds in the second positioning position (20°).

[0037] Figure 13 This is a top view of the contact mirror mold with the male and female molds in the third positioning position (165°). Detailed Implementation

[0038] The present disclosure will now be described in detail with reference to the accompanying drawings. The embodiments described herein are merely preferred embodiments based on the present disclosure; those skilled in the art will conceive of other ways to implement the present disclosure based on these preferred embodiments, and such other ways also fall within the scope of the present disclosure. In the following detailed description, directional terms such as “up,” “down,” “inner,” “outer,” “longitudinal,” and “transverse” are used with reference to the directions described in the accompanying drawings. Components of embodiments of the present disclosure may be placed in various different orientations; the directional terms are for illustrative purposes and not restrictive.

[0039] The term "contact lens" as used in this disclosure, also known as "visual lens," broadly refers to ophthalmic lenses that are worn close to the surface of the eye. These contact lenses can be corneal contact lenses, scleral contact lenses, corneoscleral contact lenses, etc. Corneal contact lenses typically land on the cornea or limbus of the eye; scleral contact lenses typically land on the sclera; corneoscleral contact lenses typically land on the limbus or on both the limbus and sclera. The contact lens can be a soft contact lens, such as a hydrogel contact lens or a silicone hydrogel contact lens; it can be a rigid contact lens, such as a lens made of rigid materials like polymethyl methacrylate (PMMA) or siloxane methacrylate (SiMA); or it can be a lens made from a combination of soft and rigid materials.

[0040] The front view of the contact lens corresponds to the viewing angle directly in front of the center of the contact lens. The front of the contact lens is the surface away from the human eye (called the "outer surface" or "front surface"); the back of the contact lens is the surface that comes into contact with the human eye (called the "inner surface" or "rear surface"). The front view of the contact lens corresponds to a schematic diagram of its axial direction, which represents the shape of the contact lens at different radial positions, etc.

[0041] The outer surface of the male mold of the contact lens mold is opposite to the inner surface of the contact lens; the inner surface of the female mold of the contact lens mold is opposite to the outer surface of the contact lens. The radial directions of the male and female molds of the contact lens mold correspond to the radial directions of the contact lens, and the axial directions correspond to the axial directions of the contact lens.

[0042] The following description, in conjunction with the accompanying drawings, illustrates the innovations of this disclosure. For example... Figure 1-5 As shown, the contact lens mold 100 of this disclosure includes a male mold 10, a female mold 20, etc. See also... Figure 1-3 The male mold 10 of the contact lens mold 100 includes a male base 11 and a protrusion 12 projecting axially from the center of the male base 11. The male base 11 can generally be manufactured with, for example... Figure 1-3 The overall shape shown is circular with a circular outer surface. For ease of manufacture and placement, the male base 11 is designed as a flat plate. The male base 11 has a circumferentially formed... Figure 1 , 2 The two shown, or as shown Figure 3 A locating pin portion 13 protrudes radially outward, as shown. The radial end of the locating pin portion 13 can be, for example, Figure 1-3 The circular structure shown.

[0043] The outer surface of the protrusion 12 of the male mold 10 is used to form the inner surface of the contact mirror 200.

[0044] See Figure 4-5 The contact lens mold 100 includes a female base 21 and a recess 22 axially recessed from the center of the female base 21. The inner surface of the recess 22 of the female mold 20 is used to form the outer surface of the contact lens 200, and the inner surface of the recess 22 is symmetrical with respect to at least one radial plane of itself. The female base 21 includes a first section and a second section distributed sequentially in its circumference, and the first section and the second section meet at the partition 25. The first section forms N first positioning grooves 23; the second section forms N-1 second positioning grooves 24, and the circumferential spacing between adjacent first positioning grooves 23 and adjacent second positioning grooves 24 is 180° / N. Each first positioning groove 23 and second positioning groove 24 is shaped to match the positioning pin 13. The circumferential spacing between adjacent first positioning grooves 23 and second positioning grooves 24 is 540° / (2 N).

[0045] For N mentioned above, its value can be set to ensure that 180° is divisible by N. For example, N can take values ​​of 9, 18, 36, etc. When N is 18, it means that the circumferential distance between adjacent first positioning grooves 23 and adjacent second positioning grooves 24 is 10°, and the circumferential distance between adjacent first positioning grooves 23 and adjacent second positioning grooves 24 is 15°. At this time, the distribution of the first positioning grooves 23 and the second positioning grooves 24 is as follows: Figure 4 , 6 As shown in Figure 7, the first positioning groove 23 has 18 grooves and the second positioning groove 24 has 17 grooves.

[0046] It should be noted that, for any part not otherwise specified in this document, the various spacings between different regions or components refer to the spacing between their respective geometric centers. For example, "circumferential spacing between adjacent first positioning grooves 23" means "circumferential spacing between the circumferential center positions of adjacent first positioning grooves 23".

[0047] It is understood that in the above design disclosed herein, the positioning grooves in the female mold 20 are not set at equal intervals. Combined with the symmetrical design of the concave surface of the female mold 20 relative to the radial plane, this allows the female mold 20 to achieve more accurate positioning of the relative positioning between the male mold 10 and the female mold 20 with a smaller number of positioning grooves. Figure 6 The example shown is N=18. For the above design, since the positioning grooves 23 and 24 of the mother mold 20 are arranged in a special non-equal spacing in the circumferential direction, that is, the circumferential spacing between adjacent first positioning grooves 23 and adjacent second positioning grooves 24 in the first and second sections is set to 10°, while the circumferential spacing between adjacent first positioning grooves 23 and adjacent second positioning grooves 24 is set to 15° (the span of 15° is the circumferential extension dimension of the partition 25), the partition 25 between the first and second sections can adjust the circumferential symmetry of each positioning groove. When the locating pin 13 (or one of multiple locating pins 13 if applicable) is aligned with the first locating groove 23 in the first partition, the contact lens mold 100 can produce a contact lens 200 with an astigmatic axis of an integer multiple of ten degrees; when the locating pin 13 (or one of multiple locating pins 13 if applicable) is aligned with the first partition, the contact lens mold 100 can produce a contact lens 200 with an astigmatic axis of an integer multiple of ten degrees (e.g., 10°, 30°, etc.); and when the locating pin 13 (or one of multiple locating pins 13 if applicable) is aligned with the second partition, the contact lens mold 100 can produce a contact lens 200 with an astigmatic axis of an integer multiple of five degrees (e.g., 15°, 25°, etc.). In conjunction with this disclosure, the concave surface of the female mold 20 is symmetrical in a radial plane ( Figure 6In this design, the concave surface is approximately symmetrical with respect to the Y-axis radial plane 26 defined by the Y-axis (i.e., the concave surfaces in each half of the +X-axis and -X-axis are mutually symmetrical). This design allows the contact lens mold 100 to be matched with a contact lens 200 requiring a 5° accuracy by setting a 10° circumferential spacing. For producing contact lenses 200 with smaller dimensions, operators (or machines) can determine the relative positions of the male mold 10 and female mold 20 without needing to use tools such as magnifying glasses, thus facilitating convenient alignment of the male mold 10 and female mold 20.

[0048] It should be noted that the above explanation is merely for the purpose of illustrating the concept of this disclosure, using the example of "N being 18 and the plane of symmetry of the concave surface of the female mold 20 being a radial plane in the Y direction". It can be understood that, provided that "180° is divisible by N; the inner surface of the recess 22 is symmetrical with respect to at least one radial plane", the value of N and the symmetry of the inner surface of the recess 22 can be arbitrarily adjusted. For example, N can also be 36, in which case the manufacturing accuracy of the contact mirror mold 100 can reach 2.5°; the plane of symmetry of the recess 22 can also be set as... Figure 6 The radial planes at 30° and 50°, etc., will not be elaborated here.

[0049] See Figure 1-2 In a preferred embodiment, the male mold 10 includes a pair of locating pins 13, the circumferential distance between the pair of locating pins 13 being (180°). (2) N-1)) / (2 N). In Figure 6 In the example where N is 18, the circumferential spacing between the locating pins 13 is 175°. In this embodiment, the two locating pins 13 can be divided into a main locating pin 13A and an auxiliary locating pin 13B radially opposite to the main locating pin 13A, wherein the radial length of the main locating pin 13A is greater than the radial length of the auxiliary locating pin 13B. Preferably, the radial length of the main locating pin 13A is set to 1.5 to 2.5 times the radial length of the auxiliary locating pin 13B. In this embodiment, the longer main locating pin 13A can be conveniently used as an alignment reference. The shorter auxiliary locating pin 13B can work in conjunction with the main locating pin 13A to maintain the relative position of the male mold 10 and the female mold 20; on the other hand, this significant difference in design between the shorter auxiliary locating pin 13B and the longer main locating pin 13A is particularly beneficial for machine (or human) identification for automated alignment.

[0050] See Figure 3This illustrates another preferred embodiment of the locating pin 13 design, in which the male mold 10 has only one locating pin 13. This locating pin 13 can be configured to have the same shape as the main locating pin 13A in the above embodiment. Clearly, this embodiment further simplifies the mold alignment process.

[0051] As a contact lens mold 100 for manufacturing a contact lens 200 used for correction, the outer surface of the protrusion 12 of the male mold 10 disclosed herein defines the astigmatism function of the contact lens 200. See also... Figure 2 Alternatively, the outer surface of the protrusion 12 defines a first radial plane 14 at its maximum surface curvature radius, and a second axial direction orthogonal to the first radial plane 14. The first radial plane 14 is defined as the first radial plane 14 containing the X-axis; correspondingly, the second radial plane 15 is the second radial plane 15 containing the Y-axis. Preferably, the circumferential center of the locating pin portion 13 (main locating pin portion 13A) of the male mold 10 is coplanar with the aforementioned first radial plane 14. In this case, the locating pin portion 13 (main locating pin portion 13A) serves as the locating reference surface (X-axis reference surface) of the male mold 10.

[0052] In this application, the inner surface of the recess 22 of the female mold 20 is configured to have a shape that defines the positioning function of the contact lens 200. The positioning function of the contact lens 200 is directly related to its astigmatism correction effect. To achieve the positioning function of the contact lens 200, designs such as prism ballast, double slab-off, and truncation can be used on the concave surface of the female mold 20. These designs can be found in publications such as CN109937376A and US20210208423A1. The innovation of this disclosure lies in applying the above-mentioned positioning designs to the concave surface of the female mold 20 and realizing the astigmatism correction function of the contact lens 200 on the male mold 10. At this time, the contact lens mold 100 using this design is particularly suitable for manufacturing soft contact lenses 200, or contact lenses 200 using soft materials only in the landing area. The reason is that, in the contact lens 200 made from the contact lens mold 100 designed above, the relevant design for positioning is concentrated on the inner surface (i.e., the rear surface) of the landing area of ​​the contact lens 200, which can avoid deformation interference caused by eyelid pressure. At the same time, the astigmatism design of the contact lens 200 is concentrated on its outer surface, rather than on the inner surface together with the positioning design of the contact lens 200, which can greatly simplify the complexity of the mold surface morphology of the contact lens mold 100.

[0053] To facilitate operators or sensors in visually determining the alignment status of the male mold 10 and the female mold 20, in one embodiment, a scale can be provided on the female mold 20 to characterize the circumferential positions of the first positioning groove 23 and the second positioning groove 24. This scale may optionally be in the form of an angle. Specifically, the scale is marked as 0° at a position corresponding to the temporal or nasal side in the horizontal direction of the human eye, and the scale is marked at intervals of up to 180° / N within the first and second partitions. When N is set to 18 as described above, the circumferential distance between adjacent first and second positioning grooves 23 and 24 in the first and second partitions corresponds to a scale of 10°.

[0054] Based on this, see Figure 6-7 A Cartesian coordinate system can be defined on the mother mold 20 with 0° as the reference. The range from 0° to 180° is marked on the +Y axis region of the Cartesian coordinate system, with graduations increasing counter-clockwise. The range from 0° to 180° is also marked on the -Y axis region of the Cartesian coordinate system, with graduations increasing counter-clockwise. This is explained below. Figure 6 , 7 The various scale markings shown are for clear illustration purposes, and arrows indicate the specific degree of each scale marking. In fact, each scale marking can be optionally set at the radial outer edge corresponding to the circumferential center of each positioning groove 23, 24, or directly at the bottom of the positioning groove 23, 24, or at other locations that are easy for operators (or machine sensors) to identify.

[0055] In the above design, to provide relatively high positioning accuracy on the small-sized master mold 20, which can be easily verified by the operator (or the machine's sensors), the applicant provides a partition 25 with a special circumferential span (15° in the example where N is 18) between the first and second partitions. At this time, combined with... Figure 4 It is understood that without special settings at the boundary between the first and second sections, there is a possibility that the positioning pin 13 of the common mold 10 may need to fall into the partition 25. In this case, the operator would need to replace the contact lens mold 100 to resolve the issue. To minimize the occurrence of such situations, the applicant has made special settings at the boundary between the first and second sections, specifically: see [link to relevant documentation]. Figure 6 The boundary between the first and second partitions is set at 135° and 315° in the Cartesian coordinate system; or as follows: Figure 7As shown, it is positioned at 45° and 225° in the Cartesian coordinate system. The reason for this design is that the applicant found that the astigmatic axis of more than 95% of astigmatic patients is between -30° (150°) and 30° and between 60° and 120°, that is, near the X-axis and Y-axis. When the boundary between the first and second zones of the above design is exactly at the oblique axis position, it can effectively avoid the situation where the positioning pin 13 (or the main positioning pin 13A) has to be aligned with the partition 25.

[0056] See also Figure 2 , 3 In the radial direction of the male base 11, the circumferential width of the locating pin portion 13 is not uniform. Specifically, the locating pin portion 13 can be configured such that its circumferential width gradually increases or is distributed in a wavy shape in the radial outward direction of the male base 11. The first locating groove portion 23 and the second locating groove portion 24, which are mutually matched in shape with the locating pin portion 13, have corresponding shapes. When the locating pin portion 13 is seated in the corresponding first locating groove portion 23 and second locating groove portion 24, the locating pin portion 13, the first locating groove portion 23, and the second locating groove portion 24 with the above-described shapes can ensure that the relative movement between the male mold 10 and the female mold 20 is reduced.

[0057] See Figure 8 and combined Figure 5 Preferably, the widths of the first positioning groove 23 and the second positioning groove 24 are preferably set to gradually decrease from the groove surface to the groove bottom. The positioning shaft, which matches the shape of the positioning groove, naturally has a corresponding shape. During mold closing, the first positioning groove 23 and the second positioning groove 24 can serve as guides.

[0058] See Figure 9-13 It shows according to Figure 3-6 The various viewing angles and mating relationships of the male mold 10 and female mold 20 of the contact lens mold 100 during mold closing are shown in the above figures. The concept and how to use the contact lens mold 100 of this application can be clearly understood from the figures. Figure 9 It shows that Figure 3 The male mold 10 shown is Figure 3-6 The diagram shown is a three-dimensional representation of the master mold 20 after it has been assembled. Figure 10 It shows Figure 9 A schematic diagram of the radial section. Figure 11-13 This illustrates contact lenses 200 with different astigmatic axes fabricated by mating male mold 10 and female mold 20, wherein female mold 20 adopts... Figure 6 The scale distribution method, Figure 11-12 use Figure 3 The public mold shown, Figure 13 use Figure 1-2 The public mold shown. See also Figure 11It shows the mating angle of the male mold 10 and the female mold 20 when preparing a contact lens 200 with a 0° / 180° astigmatic axis; Figure 12 The mating angle of the male mold 10 and the female mold 20 is shown when preparing a contact lens 200 with a 20° astigmatic axis. Figure 13 The mating angle of the male mold 10 and female mold 20 is shown when fabricating a contact lens 200 with a 165° astigmatic axis. In this example, the mating angle is... Figure 1-2 The public mold shown. Combined Figure 11-13 and Figure 3 , 6 It is understandable that operators (or the machine's sensors) can accurately align the male mold 10 and the female mold 20 in a very simple way.

[0059] For the female mold 20 of this application, it is preferably made of PP material and formed by injection molding; more preferably, it is made of homopolymer PP particles. The male mold 10 is preferably made of PP or PBT material and formed by injection molding. Advantageously, when the contact lens to be prepared is a hydrogel material, the male mold 10 can be optionally made of PP or PBT material; when the contact lens to be prepared is a silicone hydrogel material, the male mold 10 is made of PP material.

[0060] Other notes It should be noted that although the term "radial" is used in the above description, this "radial" refers only to the vertical direction relative to the circumference. It indicates the direction of extension from the center of the contact mirror mold 100 (male mold 10 or female mold 20) outward, and does not necessarily imply the potential meaning that "the radial periphery of the male mold 10 or female mold 20 of the contact mirror mold 100 is circular." For example, the radial periphery of the female mold 20 can be any shape, such as a rectangle, a hexagon, or other polygonal shape, or an ellipse or other arbitrary size.

[0061] The scope of protection of this disclosure is defined only by the claims. Thanks to the teachings of this disclosure, those skilled in the art will readily recognize that alternative structures to the structures disclosed herein can be used as feasible alternative implementations, and that the implementations disclosed herein can be combined to produce new implementations, which also fall within the scope of the appended claims.

[0062] Explanation of reference numerals in the attached figures: Male model: 10.

[0063] Male base of the male mold: 11.

[0064] The convex part of the male mold: 12.

[0065] Positioning pin of the public mold: 13.

[0066] Main Positioning Department: 13A.

[0067] Auxiliary positioning pin: 13B.

[0068] First radial plane: 14.

[0069] Second radial plane: 15.

[0070] Master mold: 20.

[0071] Female base of the female mold: 21.

[0072] The concave part of the master mold: 22.

[0073] First positioning groove: 23.

[0074] Second positioning groove: 24.

[0075] Divider section: 25.

[0076] The Y-axis radial plane (symmetry plane) of the female mold: 26.

[0077] The radial plane of the female mold in the X direction: 27.

[0078] Contact lens mold: 100.

[0079] Contact lens: 200.

Claims

1. A contact lens mold, said contact lens mold being used to manufacture a contact lens for correcting astigmatism, characterized in that, The contact lens mold includes: A male mold includes a male base and a protrusion extending outward from the central axis of the male base. The male base has at least one radially outwardly protruding locating pin portion formed thereon. The outer surface of the protrusion is used to form the inner surface of the contact lens. The female mold includes a female base and a recessed portion axially recessed from the center of the female base. The inner surface of the recessed portion is used to form the outer surface of the contact lens. The female base includes a first section and a second section distributed sequentially in its circumference. The first section forms N first positioning grooves; the second section forms N-1 second positioning grooves. The circumferential spacing between adjacent first positioning grooves and the circumferential spacing between adjacent second positioning grooves are both 180° / N. The shapes of the first positioning grooves and the second positioning grooves are matched with the positioning pins, respectively. The circumferential spacing between adjacent first positioning grooves and second positioning grooves is: 540° / (2 N)， Where N is set to ensure that 180° / N is an integer, Furthermore, the inner surface of the recess is symmetrical with respect to at least one radial plane.

2. The contact lens mold according to claim 1, wherein, The male mold includes a pair of locating pins, and the circumferential spacing between the pairs of locating pins is: (180° (2 N-1)) / (2 N)。 3. The contact lens mold according to claim 1, wherein, The outer surface of the protrusion defines a first radial plane at the position of its maximum surface curvature radius, and the circumferential center of at least one of the locating pins is coplanar with the first radial plane.

4. The contact lens mold according to any one of claims 1-3, wherein, The outer surface of the protrusion defines the astigmatism function of the contact lens, and the inner surface of the concave portion defines the positioning function of the contact lens.

5. The contact lens mold according to claim 4, wherein, The master mold includes a scale for characterizing the circumferential positions of the first positioning groove and the second positioning groove, wherein the scale is marked at a position corresponding to the temporal or nasal side in the horizontal direction of the human eye as 0°, and the scale is marked at a maximum interval of 180° / N within the first and second partitions.

6. The contact lens mold according to claim 5, wherein, A Cartesian coordinate system is defined on the master mold with the 0° mark as a reference. The range from 0° to 180° is marked on the +Y axis region of the Cartesian coordinate system and the scale is marked in a counterclockwise increment. The scale is marked on the -Y axis region of the Cartesian coordinate system, ranging from 0° to 180°, with increments in a counter-clockwise manner; and The boundary between the first partition and the second partition is located at 135° and 315° in the Cartesian coordinate system, or at 45° and 225° in the Cartesian coordinate system.

7. The contact lens mold according to claim 2, wherein, The positioning pin includes a main positioning pin and an auxiliary positioning pin that are radially opposite to the main positioning pin. The radial length of the main positioning pin is greater than the radial length of the auxiliary positioning pin.

8. The contact lens mold according to claim 7, wherein, The radial length of the main locating pin is 1.5 to 2.5 times the radial length of the auxiliary locating pin.

9. The contact lens mold according to claim 1, wherein, The circumferential width of the locating pin is not equal in the radial direction of the male base.

10. The contact lens mold according to claim 9, wherein, In the radially outward direction of the male base, the circumferential width of the locating pin gradually increases or is distributed in a wavy shape.

11. The contact lens mold according to any one of claims 1, 5-10, wherein, The width of the first positioning groove and / or the second positioning groove gradually decreases from the groove surface to the groove bottom.

12. A contact lens, characterized in that, The contact lens is prepared by the contact lens mold according to any one of claims 1-11.

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