CN114326151A

CN114326151A - Method for producing multifocal spectacle lenses and multifocal spectacles

Info

Publication number: CN114326151A
Application number: CN202111595216.3A
Authority: CN
Inventors: 刘万里; 郑昱; 赵鑫
Original assignee: Journey Technology Ltd
Current assignee: Journey Technology Ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-04-12
Anticipated expiration: 2041-12-23
Also published as: CN114326151B

Abstract

The present application provides a method of making a multifocal ophthalmic lens and multifocal ophthalmic lenses, the method comprising: shooting on the same grating recording material by using N groups of light to obtain a grating element with a plurality of optical focuses, wherein the grating element can be HOE or DOE, for example; manufacturing a multifocal spectacle lens by using the grating element; each of the N groups of lights includes an object light and a reference light, the object light in different groups corresponds to a near vision power or a far vision power (i.e., diopter) of a user, the reference light in different groups corresponds to different preset viewing distances, and each group of light corresponds to a focus or diopter. According to the method for manufacturing the multifocal spectacle lenses, the multifocal lenses are manufactured based on the angle multiplexing grating element technology, the diopter controllable step change of the lenses is realized, the multifocal spectacle lenses with smaller step change range are realized, and the use efficiency and the user experience of multifocal spectacles are improved.

Description

Method for producing multifocal spectacle lenses and multifocal spectacles

Technical Field

The present application relates to the field of eyewear, and more particularly, to a method of making multifocal ophthalmic lenses and multifocal ophthalmic lenses.

Background

Progressive addition spectacles (or also referred to as multifocal spectacles) may have different powers required to see distance, intermediate distance, and near simultaneously. A pair of multifocal eyeglasses corresponds to a plurality of eyeglasses of different powers. The multi-focus glasses solve the troubles that vision correctors need to change the glasses frequently because different diopters are needed when the vision correctors see objects at different distances. A pair of multifocal eyeglasses can see both distant objects, objects in distance, and near objects.

Currently, a multi-focus function is generally realized by dividing a multi-focus spectacle lens into zones, wherein different zones correspond to different focal lengths (or may also be referred to as diopters and focuses), but in this way, because the area of the spectacle lens is limited, the spectacle lens cannot be divided into a plurality of zones, so that the focal lengths (or diopters) corresponding to the different zones are greatly changed in a jumping manner, and when a user wears multi-focus spectacles manufactured in this way for a long time, fatigue of eyes is caused, and eye health is hurt. In addition, when the multi-focus glasses are used, the area of only one region can be used at the same time, so that the field of view (FOV) of human eyes is greatly limited, the use in an actual scene is influenced, and the use efficiency of the multi-focus glasses is reduced.

Disclosure of Invention

The application provides a method for manufacturing multifocal spectacle lenses and multifocal spectacles, the multifocal lenses are manufactured based on an angle multiplexing grating element technology, diopter controllable step change of the lenses is realized, the multifocal spectacles are manufactured by utilizing the lenses, the gradual change multifocal spectacles with smaller step change range are realized, the progressive multifocal spectacle can be better adapted to switching use among different application conditions such as far vision, intermediate vision and near vision, visual fatigue caused by overlarge diopter change range during switching of the far vision and the near vision is not easy to cause, eyes are better protected, and the use efficiency and user experience of the multifocal spectacles are improved.

In a first aspect, there is provided a method of making a multifocal ophthalmic lens, the method comprising: shooting on the same grating recording material by using N groups of light to obtain a grating element with a plurality of focuses; manufacturing a multifocal spectacle lens by using the grating element; each group of light in the N groups of light comprises object light and reference light, the object light in each group of light corresponds to the near vision degree or the far vision degree of a user, the reference light in each group of light corresponds to different preset viewing distances, each group of light corresponds to one focus, the N groups of light correspond to M focuses, M is an integer smaller than or equal to N, the reference light in the N groups of light comprises parallel reference light and non-parallel reference light, the preset distance corresponding to the parallel reference light is infinite, M is an integer larger than or equal to 2, and the multi-focus spectacle lens has M different focuses.

In the method for manufacturing a multifocal spectacle lens according to the first aspect, a predetermined plurality of sets of light are photographed on the same grating recording material, and a grating is recorded on the grating recording material, so that a grating element having a plurality of focuses (which may also be referred to as optical focuses) is obtained. Each group of light comprises object light and reference light, the reference light of different groups corresponds to different preset viewing distances, the reference light of different groups has different divergence angles or convergence angles, the object light of each group of light corresponds to the near-sighted degree or far-sighted degree of a user, different object light corresponds to different preset focuses (or can also be called diopter or focal length), each group of object light and reference light correspond to a preset focus, and the focuses corresponding to the multiple groups of light are recorded on the same grating recording material. In this way, a grating element with a plurality of focal points (or focal lengths, dioptres) can be produced. Then, the grating element is used for manufacturing the multifocal spectacle lens, so that the problems that the diopter change range is large and the FOV of human eyes is limited due to the fact that the multifocal spectacle lens manufactured by dividing the spectacle lens into regions with different focal lengths in the prior art is solved, the progressive multifocal spectacle lens with a smaller step change range can be better adapted to switching use among different application conditions such as far vision, intermediate vision and near vision, visual fatigue caused by overlarge diopter change range when the far vision and the near vision are switched is not easy to cause, the eyes are better protected, and the use efficiency and the user experience of multifocal spectacles are improved.

Illustratively, in the embodiments of the present application, the grating element may include: any one of HOE, DOE, surface relief grating and super surface grating structure.

Illustratively, the grating recording material may include: soft film materials (lower hardness) and dry plate materials (higher hardness); alternatively, the grating recording material may include a grating recording material made of silver salt, photopolymer, or polymer dispersed liquid crystal (including, for example, HPDLC), or the like.

In a possible implementation manner of the first aspect, before shooting on the same piece of grating recording material by using N sets of lights, the method further includes: determining M object lights according to the myopia degree and the hyperopia degree of a user, wherein the sum of the number of the myopia degree and the hyperopia degree is M; determining N reference lights corresponding to N different preset viewing distances; and respectively combining any one of the N reference lights and any one of the M object lights to obtain N groups of lights.

In a possible implementation manner of the first aspect, when N and M are equal, the object lights in any two sets of lights correspond to different near-sightedness degrees or far-sightedness degrees of the user, and the focuses corresponding to different sets of lights are different.

In a possible implementation manner of the first aspect, when N and M are not equal, the focal points corresponding to the multiple groups of light including the same object light are the same, and the near-sighted power or the far-sighted power corresponding to the user are the same for the same object light. That is, among the N sets of light, there are two or more sets of light corresponding to the same focal point.

In a possible implementation manner of the first aspect, the determining M object lights according to the near-vision power and the far-vision power of the user includes: according to the near vision degree and the far vision degree of the user, determining a focus and a focal length which respectively correspond to each near vision degree and each far vision degree; according to the focus corresponding to each myopia degree and each hyperopia degree, determining the divergence angle or the convergence angle of the diffracted light corresponding to each focus, wherein the number of the diffracted lights is M; determining the divergence angle or the convergence angle of the object light corresponding to each diffracted light according to the divergence angle or the convergence angle of each diffracted light; and determining the M object lights according to the divergence angles or the convergence angles corresponding to the M object lights respectively.

In a possible implementation manner of the first aspect, taking a picture on the same piece of grating recording material by using N sets of lights includes: generating a first light beam by using a laser light source, and enabling the first light beam to be incident into a first beam splitter; the first beam splitter divides the first light beam into first reference light and first object light, the first reference light and the first object light are any one of N groups of light, the first beam splitter enables the first reference light to be incident into the first reflecting mirror, the first object light is incident into the second reflecting mirror, the first reference light is any one of the N reference light, and the first object light is any one of the N object light; the first reflector enables the first reference light to be incident into a first spatial filter, the first spatial filter enables the first reference light to be incident into a first Fourier lens, the first Fourier lens enables the first reference light to be incident into a second beam splitter, the divergence angle or the convergence angle of the first reference light, which is incident into the second beam splitter, of the first Fourier lens is the same as that of the first reference light in the N reference lights, and the second beam splitter enables the first reference light from the first Fourier lens to be transmitted onto the grating recording material; the second reflector enables the first object light to be incident into the second spatial filter, the second spatial filter enables the first object light to be incident into the second Fourier lens, the second Fourier lens enables the first object light to be incident into the second beam splitter, the divergence angle or the convergence angle of the first object light, which is incident into the second beam splitter, of the second Fourier lens is the same as the divergence angle or the convergence angle of the first object light in the N object lights, and the second beam splitter reflects the first object light from the second Fourier lens onto the grating recording material.

In a possible implementation manner of the first aspect, the laser light source includes: red light laser light source, blue light laser light source, green laser light source, this method still includes: the red light laser light source emits the generated red light into the third reflector, the third reflector reflects the red light into the first dichroic mirror, the first dichroic mirror transmits the red light into the second dichroic mirror, and the second dichroic mirror reflects the red light into the first beam splitter; the green laser light source emits the generated green light into the first dichroic mirror, the green light is reflected into the second dichroic mirror in the first dichroic mirror, and the green light is reflected into the first beam splitter by the second dichroic mirror; the blue light laser light source emits the generated blue light into the second dichroic mirror, and the second dichroic mirror transmits the blue light into the first beam splitter. In the implementation mode, the grating element made of the grating recording material does not form color difference in the use process, wavelength is used for multiplexing, and the use effect is better.

In a second aspect, there is provided a multifocal ophthalmic lens formed by the method of the first aspect, or any one of the possible implementations of the first aspect, having M distinct focal points.

The multifocal spectacle lens provided by the second aspect has a plurality of different focal lengths (or diopters), so that the problems that the diopter change range is large and the FOV of human eyes is limited due to the fact that the multifocal lens manufactured by dividing the lens into regions with different focal lengths in the prior art are solved, a smaller step change range is realized, the multifocal spectacle lens can be better adapted to switching use among different application conditions such as far vision, intermediate vision and near vision, visual fatigue caused by overlarge diopter change range during switching of far vision and near vision is not easy to cause, the eyes are better protected, and the use efficiency and the user experience of the multifocal lens are improved.

In a third aspect, there is provided multifocal ophthalmic lenses comprising the multifocal ophthalmic lenses of the second aspect, the multifocal ophthalmic lenses having M distinct foci, M being an integer greater than or equal to 2.

The multifocal spectacles provided by the third aspect realize the gradual change multifocal spectacles with smaller step change range, can better adapt to the switching use among different application conditions such as far vision, intermediate vision and near vision, is not easy to cause visual fatigue caused by overlarge diopter change range when the far vision and the near vision are switched, better protects eyes, and improves the use efficiency and user experience of the multifocal spectacles.

In a fourth aspect, there is provided a method of using multifocal ophthalmic lenses comprising the multifocal ophthalmic lenses provided in the second aspect above, the multifocal ophthalmic lenses having M distinct foci, the method comprising:

determining a distance to view an object for using the multi-focus glasses; when the distance is equal to a first preset distance in the preset viewing distance, the focal length of the multi-focal glasses is a first focal length corresponding to the first preset distance, and the power of the multi-focal glasses is a near-sighted power or a far-sighted power corresponding to the first focal length.

In the using method of the multi-focal glasses provided by the fourth aspect, when the distance from the user to the object is the same as any one of the preset viewing distances in the process that the user uses the multi-focal glasses to view objects with different distances, diffracted light corresponding to the preset distance can appear on the lens, so that a focus and a focal length corresponding to the diffracted light are formed, and the function of the multi-focal glasses is realized.

In a possible implementation manner of the fourth aspect, the preset viewing distance includes N different viewing distances, the N different viewing distances correspond to N groups of lights, each group of the N groups of lights includes object light and reference light, the object light in each group of lights corresponds to a near vision power or a far vision power of a user, the reference light in each group of lights corresponds to a different preset viewing distance, each group of lights corresponds to one focus, the N groups of lights correspond to M focuses, M is an integer less than or equal to N, the reference light in the N groups of lights includes parallel reference light and non-parallel reference light, and the preset distance corresponding to the parallel reference light is infinity.

In a possible implementation manner of the fourth aspect, when N and M are equal, object lights in any two groups of lights are different, different object lights correspond to different near-sighted degrees or far-sighted degrees of a user, and corresponding focuses of different groups of lights are different; or when N and M are not equal, the corresponding focuses of the multiple groups of lights including the same object light are the same, and the corresponding near-sighted powers or far-sighted powers of the user of the same object light are the same.

Drawings

Fig. 1 is a schematic view of an example of a structure of a multifocal ophthalmic lens.

Fig. 2 is a schematic flow chart of an example of a method for manufacturing a multifocal ophthalmic lens according to an embodiment of the present application.

Fig. 3 is a schematic diagram of optical paths for determining object light and reference light in a design process according to another example provided in this embodiment.

Fig. 4 is a schematic diagram of optical paths of an example of the reference light 1 and the object light 1 in the process of shooting on the grating recording material according to the embodiment of the present application.

Fig. 5 is a schematic diagram of optical paths of an example of the reference light 2 and the object light 2 during shooting on a grating recording material according to the embodiment of the present application.

Fig. 6 is a schematic diagram of optical paths of an example of the reference light 3 and the object light 3 in the process of shooting on the grating recording material according to the embodiment of the present application.

Fig. 7 is a schematic diagram of an example of an optical path when a user uses multi-focus glasses according to an embodiment of the present disclosure.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

In the description of the embodiments of the present application, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present embodiment, "a plurality" means two or more unless otherwise specified.

The progressive multi-focus glasses are invented by 'looking at the road' 61 years ago, and are named as 'trillione' according to the road. The multi-focus glasses are characterized in that the far light area and the near light area of the same lens are organically connected together in a progressive diopter change mode from the far diopter number to the near diopter number, so that different diopters required for watching far distance, medium distance and near distance can be simultaneously possessed on one lens. A pair of multifocal eyeglasses corresponds to a plurality of eyeglasses of different powers.

The multi-focus glasses solve the troubles that middle-aged and elderly people need to change the glasses frequently when watching objects with different distances and need to change the glasses with different diopters. A pair of multifocal eyeglasses can see both distant objects, objects in distance, and near objects.

Fig. 1 is a schematic view showing an example of a structure of a multifocal ophthalmic lens. As shown in fig. 1, the multifocal ophthalmic lens is divided into three functional zones, namely a far-viewing zone, a middle-viewing zone and a near-viewing zone, and different zones correspond to different focal lengths (or may be referred to as diopters and focuses).

Wherein, the far-looking area is the power needed by looking at the object at the far position and is positioned at the upper part of the lens. The near zone is the power needed for seeing a near object and is positioned at the lower part of the lens. The part connecting the near-viewing zone and the far-viewing zone is a middle-viewing zone (or can be also called a gradual change zone), and the middle-viewing zone can be used for viewing the middle-viewing distance object. In other words, in the example shown in fig. 1, the same multifocal spectacle lens corresponds to a plurality of different focal lengths. From the appearance, progressive addition lenses are not distinguished from ordinary lenses.

In the technical scheme shown in fig. 1, the lenses of the glasses are divided into three areas with different diopters through optical design, so as to achieve the purpose of multi-focus glasses. However, in the solution shown in fig. 1, although three different areas on the same lens correspond to different focal lengths, the difference between the focal lengths corresponding to the three different areas is still relatively large, which causes a large jump change between the focal lengths (or diopters) corresponding to the three areas, and thus, when a user wears the multi-focal glasses manufactured in this way for a long time, fatigue of the eyes may be caused, and the health of the eyes may be damaged. In addition, since the area of the lenses of the glasses is limited, the variation range of the diopter of different areas cannot be reduced to a small range by the zone division mode.

On the other hand, the lens is divided into three different areas, so that the area of only one area can be used at the same time when the glasses are used, the field of view (FOV) of human eyes is greatly limited, and the use in an actual scene is influenced (for example, when a user uses an outdoor scene, the user cannot see the outdoor scene completely, and the risk of falling down, traffic accidents and the like easily occurs). In addition, due to the limited area of the lens, the lens is divided into three areas with different focal lengths, so that observation areas with more focal lengths (or focal points) cannot be realized, and the use efficiency of the multi-focal-point glasses is reduced.

At present, the lens can be divided into more areas in the related art. For example, the lens may be divided into a distance vision zone, a near vision zone, a middle distance vision zone, and first and second progressive zones. The far distance visual area, the near distance visual area and the middle distance visual area are three areas with different diopters respectively, the area between the far distance visual area and the middle distance visual area is a first gradual change area, and the area between the middle distance visual area and the near distance visual area is a second gradual change area. By adopting the mode, the diopter difference steps of the two adjacent visual areas have transition areas, the progressive multifocal glasses are realized in a real sense, and the visual fatigue caused by overlarge diopter change when the visual areas are replaced is avoided.

By adopting the scheme, the lens is divided into five areas, and a user can only use the area of one area at the same time when using the lens, so that the FOV of human eyes is limited greatly, and the use in an actual scene is influenced (for example, when the user uses an outdoor scene, the user cannot see the outdoor scene completely, and the danger of falling or traffic accidents and the like easily occurs). In addition, due to the limited area of the lens of the spectacles, the lens is divided into three visual areas and limited multifocal areas such as two gradual change areas, so that observation areas with more focal lengths (or focal points) cannot be realized, and the use efficiency of multifocal spectacles is reduced.

In view of the above, the present application provides a method for manufacturing multifocal spectacle lenses and multifocal spectacles, in which a multifocal lens is manufactured based on an angle multiplexing grating element technology, a diopter controllable step change of the lens is implemented, and multifocal spectacles are manufactured by using the lens, so that the problems of large diopter change range and limitation of FOV of human eyes caused by multifocal spectacles manufactured by dividing the lens into different focal length regions in the prior art are solved, and the progressive multifocal spectacles with a smaller step change range are implemented, which can better adapt to switching use among different application conditions such as far vision, intermediate vision and near vision, and are not easy to cause visual fatigue caused by too large diopter change range when far vision and near vision are switched, thereby better protecting the eyes, and improving the use efficiency and user experience of the multifocal spectacles.

In the method for manufacturing a multifocal spectacle lens provided by the present application, a predetermined plurality of sets of light are imaged on the same grating recording material, and a grating is recorded on the grating recording material, thereby obtaining a grating element (the grating element may be referred to as a grating film, a grating optical element, or the like) having a plurality of light focuses (light focuses may be referred to as foci). Each group of light comprises object light and reference light, the reference light of different groups corresponds to different preset viewing distances, the reference light of different groups has different divergence angles, the object light of each group corresponds to the near-sighted degree or far-sighted degree of a user, the near-sighted degree or far-sighted degree corresponding to different object light is different, different object light corresponds to different preset focuses (or can also be called diopter or focal length), different object light has different divergence angles or convergence angles, each group of light corresponds to a preset focus, so that the focuses corresponding to the multiple groups of light respectively are recorded on the same grating recording material, and grating elements with multiple focuses (or can also be called focal length and diopter) can be manufactured by using the method. And then, manufacturing a multi-focus spectacle lens by using the grating element. When a user uses the multi-focus glasses to see objects with different distances, when the distance from the user to the object is the same as any one of preset viewing distances, diffraction light corresponding to the preset distance can appear on the lens, so that a focus and a focal length corresponding to the diffraction light are formed, and the function of the multi-focus glasses is realized.

Optionally, in this embodiment, the grating element may include: any one of a Holographic Optical Element (HOE), a Diffractive Optical Element (DOE), a surface relief grating, and a super-surface grating structure. It should be understood that this should not be limiting for the grating elements in the embodiments of the present application, for example, in other embodiments of the present application, the grating elements may be other types or forms of grating elements, etc. The embodiments of the present application are not limited thereto.

The method for manufacturing a multifocal ophthalmic lens provided by the present application will be described below with reference to specific examples.

Fig. 2 is a schematic flow chart illustrating an example of a method for manufacturing a multifocal ophthalmic lens according to the present application. As shown in fig. 2, the method includes: s110 to S140.

And S110, determining a plurality of different object lights according to the near vision degree and the far vision degree of the user.

In some possible implementations, the divergence or convergence angle of each of the plurality of different object lights may be determined according to the near vision power and the far vision power (or also referred to as diopters) of the vision correction user (or also referred to as user).

In other possible implementation manners, the near vision degree and the far vision degree applicable to the multi-focus glasses may also be preset in advance, and then the divergence angle or the convergence angle corresponding to each of the plurality of different object lights is determined according to the preset near vision degree and the preset far vision degree.

The following description will be given taking as an example the case of correcting the degree of myopia and hyperopia of a user.

In some possible embodiments, S110 may include the following steps S111 to S113.

And S111, determining the focus and the focal length corresponding to different degrees according to the near vision degree and the far vision degree of the user.

For example, a plurality of different lens focal lengths may be determined according to equation (1) and equation (2) as follows.

S＝100×D (2)

In formula (1), f represents a focal length, in formula (1) and formula (2), D represents diopter, and in formula (2), S represents the power of eyeglasses. Wherein, for the myopic degree, f and D are both negative values, which means that the lens is set as a myopic lens (or a concave lens) without real focus, and the focus of the lens is a virtual focus at the moment, and the focus is the focus of the virtual focus. For distance power, f and D are both positive, indicating that the lens is set as a telescopic mirror (or convex lens), with (there is) a real focus, the focal length being that of the real focus.

Because the myopic eye and the hyperopic eye power of the vision correction user can be determined in advance, the diopter can be determined according to the myopic eye and the hyperopic eye power S of the vision correction user, and the focal lengths corresponding to different powers are further determined according to the calculated diopter.

For example. Suppose that: the far vision power of the vision correction user is 800 degrees, and the near vision power is 300 degrees and 500 degrees respectively.

For a distance vision power of 800 degrees. Calculated using equations (1) and (2): f. of₁＝0.125m，D₁Wherein, f₁The focal length of diffracted light after light reflected by an object is incident on an eyeglass lens when a user looks at the object using eyeglasses with a distance vision power of 800 degrees.

For 300 degrees of myopia. Calculated using equations (1) and (2): f. of₂＝-0.333m，D₂Is-3, wherein f₂The focal length of diffracted light after light reflected by an object is incident on an eyeglass lens when a user looks at the object using eyeglasses with 300 degrees of near vision.

For 500 degrees of myopia. Calculated using equations (1) and (2): f. of₃＝-0.2m，D₃-5 wherein, f₃The focal length of diffracted light after light reflected by an object is incident on an eyeglass lens when a user looks at the object using eyeglasses with 500 degrees of near vision.

Illustratively, in the embodiments of the present application, the focal length f₁Corresponding focal point F₁Denotes, focal length f₂Corresponding focal point F₂Denotes, focal length f₃Corresponding focal point F₃And (4) showing. F₁Corresponding to a hyperopia degree of 800 degrees, which is a real focus;F₂corresponding to 300 degrees of myopia as a virtual focus, F₃Corresponding to 500 degrees of myopia, which is a virtual focus.

Focal point F₁Distance from grating element (focal length f)₁) 0.125m, focal point F₂Distance from grating element (focal length f)₂) 0.333m, focus F₃Distance from grating element (focal length f)₃) Is 0.2 m.

And S112, determining the divergence angle or the convergence angle of the diffracted light according to the focus or the focal length respectively corresponding to different degrees.

Since the positions of a plurality of different focal points, which are generated by the diffracted light, have been determined, the divergence angle or the convergence angle of the diffracted light can be inversely estimated.

It is understood that the divergent angle or the convergent angle of the diffracted light is different for different focal points.

In the following description, the method of the present application will be specifically described by taking the grating element as HOE as an example, but it should be understood that this should not be construed as limiting the grating element in the embodiments of the present application. For example, in other embodiments of the present application, the grating element may also be a DOE, a surface relief grating, or a super-surface grating structure, etc. The embodiments of the present application are not limited thereto.

In some possible embodiments of the present application, since the relative positions of the raster element (taking HOE as an example) placed during production and during use are the same, the HOE area is determined and unique, and the area of the preset produced HOE area can be determined. For example, fig. 3 is a schematic diagram illustrating the optical paths of the object light and the reference light determined in the design process, and the process shown in fig. 3 can be understood as an optical path diagram during the HOE design stage, which is not an actual optical path diagram when glasses made by the HOE are actually used.

As shown in fig. 3, the shaded area of the HOE is a preset HOE area (or may also be referred to as an effective area of the HOE), which is set in advance, and the relative position where the HOE is placed when the HOE is used and manufactured for shooting is the same, so that the boundary line of the diffracted light can be determined according to a plurality of known different focal points or focal lengths, and the convergence angle or the divergence angle of the diffracted light can be determined.

For example, in conjunction with the above example, in S111, F has been determined₁、F₂、F₃(or f)₁、f₂、f₃) Then and F can be determined separately₁、F₂、F₃The respective boundary lines of diffracted light 1, diffracted light 2, and diffracted light 3, as shown in fig. 3, further, the divergence angle or convergence angle of diffracted light 1, diffracted light 2, and diffracted light 3 can be determined from the boundary lines of diffracted light 1, diffracted light 2, and diffracted light 3. As shown in FIG. 2, angle 1 is shown as being equal to F₁The corresponding divergence angle of diffracted light 1, angle 2 being F₂The corresponding convergence angle of the diffracted light 2, angle 3 being equal to F₃The corresponding convergence angle of the diffracted light 3.

It is to be understood that diffracted light 1, diffracted light 2, and diffracted light 3 shown in fig. 3 represent boundaries of diffracted light, and that in practice, angle 1, angle 2, and angle 3 are all spatial cone angles, diffracted light is also a cone-range beam, and diffracted light shown in fig. 3 represents boundaries of diffracted light.

And S113, determining the divergence angle or the convergence angle of the object light according to the divergence angle or the convergence angle of the diffracted light.

According to the characteristics of diffraction optics, the divergence angle or the convergence angle of the diffracted light in use is determined by the divergence angle or the convergence angle of the object light, and the boundary of the diffracted light is collinear with the boundary of the object light, so that the divergence angle or the convergence angle of the diffracted light is equal to the divergence angle or the convergence angle of the object light, and the divergence angle or the convergence angle of the object light can be determined according to the divergence angle or the convergence angle of the diffracted light, thereby further determining a plurality of object lights.

For example, in combination with the above example, as shown in fig. 3, the object beam 1, the object beam 2, and the object beam 3 shown in fig. 3 are all boundary lines of the object beam. The boundary of the diffracted light 1 and the boundary of the object light 1 are collinear, so that the boundary of the object light 1 can be determined, and further the divergence angle of the object light 1 is determined, and the included angle formed by the reverse extension lines of the boundary of the object light 1 is an angle 1 (namely the divergence angle of the object light 1); the boundary of the diffracted light 2 and the boundary of the object light 2 are collinear, so that the boundary of the object light 2 can be determined, and further the convergence angle of the object light 2 is determined, and the included angle formed by the boundaries of the object light 2 is an angle 2 (namely the convergence angle of the object light 2); the boundary of the diffracted light 3 and the boundary of the object light 3 are collinear, so that the boundary of the object light 3 can be determined, and further the convergence angle of the object light 3 can be determined, and the included angle formed by the boundaries of the object light 3 is the angle 3 (namely the convergence angle of the object light 3). After the divergence angle or the convergence angle of the object light is determined, and thus three different object lights are determined.

And S120, determining a plurality of different reference lights according to different preset distances for watching the object when the glasses are used.

When the user views an object using the multi-focus glasses, the following may be preset in advance: a plurality of different distances between a multifocal spectacle lens (made of a lenticular element HOE) and an object being viewed in a multifocal spectacle scenario are used.

For example, assume that: when the multi-focus glasses are used, the distance between the multi-focus glasses (i.e. the grating element) and the object is L respectively₁、L₂、L₃，L₁Indicating that the user is watching L using multifocal glasses₁Object at distance, L₂Indicating that the user is watching L using multifocal glasses₂Object at distance, L₃Indicating that the user is watching L using multifocal glasses₃Object at distance, assume: l is₁Is 40cm, L₂Is 5m, L₃Representing an infinite distance. In other words, L₁Indicating that the distance between the HOE and the object is close, L₂Indicating that the distance between the HOE and the object is a medium distance, L₃Indicating that the HOE is at an infinite distance from the object. Since the position of the HOE is fixed and the area photographed on the HOE is also set in advance, according to L₁、L₂、L₃Respectively, and L can be determined₁、L₂、L₃Corresponding different reference light boundaries, e.g. as shown in FIG. 3, with L₁Corresponding to reference light 1, and L₂Corresponding to reference light 2, and L₃Corresponding to the reference light 3. After the boundaries of the different reference lights are determined, the respective corresponding divergence angles or convergence angles of the different reference lights can be determined, and after the divergence angles or the convergence angles of the reference lights are determined, a plurality of reference lights can be further determined. In other words, the divergence angle or the convergence angle of different reference lights is determined according to the preset different use distances.

For example, as shown in fig. 3, the divergence angle of the reference beam 1 is angle 4, the divergence angle of the reference beam 2 is angle 5, and since the reference beam 3 is parallel, the divergence angle of the reference beam 3 is 0 degree, that is, three different reference beams are determined.

It is understood that in the embodiments of the present application, L₁And L₂Other values are also possible, as long as L is satisfied₁Is less than L₂The value of (b) is not limited herein.

It is understood that S110 to S120 describe the process for the HOE design phase.

And S130, shooting on the same grating recording material by using a plurality of groups of light, and recording a grating on the grating recording material to obtain the HOE with a plurality of light focuses, wherein each group of light comprises object light and reference light.

For example, in the embodiments of the present application, the grating recording material may be classified into: soft film materials (lower hardness) and dry plate materials (higher hardness); the method can be divided into the following components according to the reaction mechanism: a grating recording material made of silver salt, photopolymer, or polymer dispersed liquid crystal (including, for example, HPDLC), or the like. It should be understood that in other embodiments of the present application, the grating recording material can be made of other similar materials, and the embodiments of the present application are not limited herein.

It should also be understood that, in other embodiments of the present application, the grating element obtained after the grating recording material is exposed (photographed) may also be a DOE, a surface relief grating, a super-surface grating structure, or the like, according to different processes of manufacturing and exposing the grating recording material, and embodiments of the present application are not limited herein. In the following examples, a grating element obtained by exposure on a grating recording material will be described as an example of an HOE.

For example, in the embodiment of the present application, a group of lights is composed of any one of the plurality of different object lights and any one of the plurality of different reference lights determined as described above, and an image is captured on the same grating recording material using all the groups of lights, and a grating (holographic grating) is recorded on the grating recording material, thereby obtaining an HOE.

For example, in connection with the above example, assume:

reference light 1 and object light 1 are arranged in one group, reference light 1 is arranged as divergent light with a divergence angle of 4, object light 1 is arranged as focal length f₁Divergent light of 12.5cm with an angle of divergence of 1;

the reference light 2 and the object light 2 are set as a set, the reference light 2 is set as divergent light having a divergent angle of 5, and the object light 2 is set as a virtual focal length f₂The concentration light is 33.3cm and the concentration angle is angle 2;

the reference light 3 and the object light 3 are set as a set, the reference light 3 is set as a parallel light, the object light 3 is set as a virtual focal length f₃20cm, and the convergence angle is the angle 3;

it should be understood that, in the above example, the case where the number of the reference light and the number of the object light are the same is taken as an example for explanation, for example: the reference lights are respectively: and L₁Correspondingly, the reference light 1; and L₂Correspondingly, the reference light 2; and L₃Corresponding to the reference light 3. The object light is respectively: the object light 1 is set to the focal length f₁Divergent light of 12.5cm with a divergence angle of 1. The object light 2 is set to a virtual focal length f₂The concentration light is 33.3cm and the concentration angle is angle 2; the object light 3 is set to a virtual focal length f₃20cm, converging at an angle of 3. Thus, the above three groups of lights are respectively composed, and the three groups of lights correspond to 3 different focal points (diopters).

In other embodiments of the present application, the number of reference lights and the number of object lights may be different, for example, the number of reference lights may be greater than the number of object lights.

For example: suppose that: the object light is respectively: object light 1 arrangementIs the focal length f₁Divergent light of 12.5cm with an angle of divergence of 1; the object light 2 is set to a virtual focal length f₂The concentration light is 33.3cm and the concentration angle is angle 2; the object light 3 is set to a virtual focal length f₃20cm, converging at an angle of 3. And the reference light is: and L₁Corresponding to reference light 1, and L₂Corresponding to reference light 2, and L₃Corresponding to reference light 3, and L₄Correspondingly, the reference light 4; wherein L is₁、L₂、L₃、L₄Corresponding to different preset viewing distances, in this case, four groups of light can still be combined, wherein the object light in two groups of light is the same, the two groups of light correspond to the same focal point (diopter), and the four groups of light correspond to three different focal points or diopters. In other words, the number of groups of combined light is determined by the number of reference light, and the focal point (diopter) corresponding to each group of light is determined by the object light in the group of light, and if the object light in the two groups of light is the same, the focal points (diopter) corresponding to the two groups of light are the same.

In the following examples, the case where the number of reference beams is the same as the number of object beams will be described as an example.

Fig. 4 is a schematic diagram illustrating optical paths of an example of the reference light 1 and the object light 1 provided by the present application during photographing on a grating recording material.

As shown in fig. 4, laser B is used to produce blue light, laser G is used to produce green light, and laser R is used to produce red light. The laser R generates red light to be incident on the reflecting mirror 1, the red light is reflected by the reflecting mirror 1 and then is incident on the dichroic mirror 1, the laser G generates green light to be incident on the dichroic mirror 1, and the dichroic mirror 1 is used for reflecting the green light and transmitting the red light, so that the light emitted by the dichroic mirror 1 is red light and green light. The red light and the green light emitted by the dichroic mirror 1 are incident into the dichroic mirror 2, the blue light generated by the laser B is also incident into the dichroic mirror 2, and the dichroic mirror 2 is used for transmitting the blue light and reflecting the red light and the green light, so that the light emitted by the dichroic mirror 2 is the blue light, the red light and the green light, in other words, the blue light, the red light and the green light are combined into one light by the dichroic mirror 2. Light (including blue light, red light and green light) emitted by the dichroic mirror 2 enters the beam splitter 1, and the beam splitter 1 splits the light from the dichroic mirror 2 into reference light 1 and object light 1.

Reference light 1 is incident on a reflector 2, is incident in a spatial filter 1 after being reflected by the reflector 2, the spatial filter 1 filters and expands the reference light 1, and the filtered and expanded reference light 1 is incident in a Fourier lens 1, and the divergence angle of the reference light 1 emitted by the Fourier lens 1 is equal to an angle 4 shown in FIG. 3 by adjusting the relative position between the spatial filter 1 and the Fourier lens 1. Reference light 1 emitted by the Fourier lens 1 is incident into a beam splitter 2, the beam splitter 2 transmits the reference light from the Fourier lens 1, and the transmitted reference light 1 is incident on a grating recording material.

The object light 1 is incident into the attenuation sheet, the light intensity of the object light 1 is attenuated, the attenuation sheet is used for enabling the object light 1 with the attenuated intensity to be incident onto the reflector 3, the object light is incident into the spatial filter 2 after being reflected by the reflector 3, the spatial filter 2 is used for filtering and expanding the object light 1, the object light 1 after being filtered and expanded is incident into the Fourier lens 2, and the divergence angle of the object light 1 emitted by the Fourier lens 2 is equal to the divergence angle 1 shown in the figure 3 by adjusting the relative position between the spatial filter 2 and the Fourier lens 2. The object light 1 emitted from the fourier lens 2 is incident on the beam splitter 2, the beam splitter 2 reflects the object light from the fourier lens 2, so that the reflected object light 1 is incident on the grating recording material, and an extension line of a boundary of the object light 1 reflected on the grating recording material intersects with a point on the right side of the grating recording material, and the point corresponds to a focal point F in fig. 3₁。

It should be understood that the attenuation sheet shown in fig. 4 is optional, i.e., the optical path structure in fig. 4 may not include an attenuation sheet. The attenuation sheet is used for adjusting the light intensity of the object light 1, so that the light intensity of the object light 1 reflected to the grating recording material is the same as that of the reference light 1 transmitted to the grating recording material.

In the manner shown in fig. 4, the photographing of the reference light 1 and the object light 1 on the grating recording material is completed. In other words, after the photographing process (or also referred to as an exposure process) shown in fig. 4, a holographic grating is recorded on the grating recording material, and the photographing process shown in fig. 4 may also be referred to as a holographic exposure.

The holographic grating obtained after the exposure process shown in FIG. 4 has a corresponding focus F shown in FIG. 3₁Focal length f₁0.125 m. Suppose that: l is₁The distance between the holographic grating and the object is 40cm, the holographic grating is used for manufacturing a multifocal spectacle lens, when a wearer uses the multifocal spectacle to look at the object with the distance of 40cm, the multifocal spectacle lens diffracts diffracted light 1, and the diffracted light 1 generates a focus F₁Corresponding focal length f₁0.125m, the glasses are 800 degrees distance vision glasses.

In connection with the above example, the reference light 2 and the object light 2 are set as a set, the reference light 2 is set as divergent light having a divergent angle of 5, the object light 2 is set as convergent light having a virtual focal length of 33.3cm and a convergent angle of 2, and after the reference light 1 and the object light 1 are photographed on the grating recording material, the reference light 2 and the object light 2 are continuously photographed on the grating recording material, that is, the reference light 1 and the object light 1, and the reference light 2 and the object light 2 are photographed on the same grating recording material, respectively. Fig. 5 is a schematic diagram illustrating optical paths of an example of the reference light 2 and the object light 2 provided by the present application during photographing on a grating recording material. Among them, the grating recording material shown in fig. 5 is a grating recording material obtained after having been photographed in the manner shown in fig. 4.

As shown in fig. 5, laser B is used to produce blue light, laser G is used to produce green light, and laser R is used to produce red light. The laser R generates red light to be incident on the reflecting mirror 1, the red light is reflected by the reflecting mirror 1 and then is incident on the dichroic mirror 1, the laser G generates green light to be incident on the dichroic mirror 1, and the dichroic mirror 1 is used for reflecting the green light and transmitting the red light, so that the light emitted by the dichroic mirror 1 is red light and green light. The red light and the green light emitted by the dichroic mirror 1 are incident into the dichroic mirror 2, the blue light generated by the laser B is also incident into the dichroic mirror 2, and the dichroic mirror 2 is used for transmitting the blue light and reflecting the red light and the green light, so that the light emitted by the dichroic mirror 2 is the blue light, the red light and the green light, in other words, the blue light, the red light and the green light are combined into one light by the dichroic mirror 2. Light (including blue light, red light and green light) emitted by the dichroic mirror 2 enters the beam splitter 1, and the beam splitter 1 splits the light from the dichroic mirror 2 into reference light 2 and object light 2.

The reference light 2 is incident on the reflector 2, is incident in the spatial filter 1 after being reflected by the reflector 2, the spatial filter 1 filters and expands the reference light 2, and the filtered and expanded reference light 2 is incident in the Fourier lens 1, and the divergence angle of the reference light 2 emitted by the Fourier lens 1 is equal to an angle 5 shown in FIG. 3 by adjusting the relative position between the spatial filter 1 and the Fourier lens 1. Reference light 2 emitted by the Fourier lens 1 is incident into the beam splitter 2, the beam splitter 2 transmits the reference light from the Fourier lens 1, and the transmitted reference light is incident on the grating recording material.

The object light 2 is incident into the attenuation sheet, the light intensity of the object light 2 is attenuated, the attenuation sheet is used for enabling the object light 2 with the attenuated intensity to be incident onto the reflector 3, the object light is incident into the spatial filter 2 after being reflected by the reflector 3, the spatial filter 2 is used for filtering and expanding the object light 2, the object light 2 after being filtered and expanded is incident into the Fourier lens 2, and the convergence angle of the object light 2 emitted by the Fourier lens 2 is equal to the angle 2 shown in the figure 3 by adjusting the relative position between the spatial filter 2 and the Fourier lens 2. The object light 2 emitted from the fourier lens 2 is incident on the beam splitter 2, the beam splitter 2 reflects the object light from the fourier lens 2, so that the reflected object light 2 is incident on the grating recording material, and the reverse extension line of the boundary of the object light 2 reflected on the grating recording material intersects with a point on the left side of the grating recording material, and the point is equivalent to a virtual focus F in fig. 3₂。

It should be understood that the attenuation sheet shown in fig. 5 is optional, i.e., the optical path structure in fig. 5 may not include an attenuation sheet.

In the manner shown in fig. 5, the photographing of the reference light 2 and the object light 2 on the grating recording material is completed. In other words, after the photographing process shown in fig. 5, the corresponding focal points of the grating recording material (or may be referred to as a holographic grating) include: focal point F shown in FIG. 3₁Focal length f₁0.125m, and shown in fig. 3Virtual focus F₂Focal length f₂33.3 cm. Suppose that: l is₁Is 40cm, L₂5m, when a wearer looks at an object at 40cm by using the multifocal spectacles, the multifocal spectacle lens diffracts diffracted light 1, and the diffracted light 1 generates a focus F₁Corresponding focal length f₁0.125m, the glasses are 800 degrees distance vision glasses; when a wearer looks at an object with a distance of 5m by using glasses, the multifocal spectacle lens diffracts the diffracted light 2, and the diffracted light 2 generates a focus F₂Corresponding focal length f₂The glasses are 300 degree distance vision glasses 33.3 cm.

In connection with the above example, the reference light 3 and the object light 3 are set as a set, the reference light 3 is set as a parallel light, the object light 3 is set as a converging light having a virtual focal length of 20cm and a converging angle of 3, and after photographing of the reference light 1 and the object light 1, and the reference light 2 and the object light 2 on the same piece of grating recording material is completed, the reference light 3 and the object light 3 are photographed on the grating recording material, that is, the reference light 1 and the object light 1, the reference light 2 and the object light 2, and the reference light 3 and the object light 3 are photographed on the same piece of grating recording material, respectively. Fig. 6 is a schematic diagram illustrating optical paths of an example of the reference light 3 and the object light 3 provided by the present application during photographing on a grating recording material. Among them, the grating recording material shown in fig. 6 is a grating recording material obtained after having been photographed in the manner shown in fig. 5.

As shown in fig. 6, laser B is used to produce blue light, laser G is used to produce green light, and laser R is used to produce red light. The laser R generates red light to be incident on the reflecting mirror 1, the red light is reflected by the reflecting mirror 1 and then is incident on the dichroic mirror 1, the laser G generates green light to be incident on the dichroic mirror 1, and the dichroic mirror 1 is used for reflecting the green light and transmitting the red light, so that the light emitted by the dichroic mirror 1 is red light and green light. The red light and the green light emitted by the dichroic mirror 1 are incident into the dichroic mirror 2, the blue light generated by the laser B is also incident into the dichroic mirror 2, and the dichroic mirror 2 is used for transmitting the blue light and reflecting the red light and the green light, so that the light emitted by the dichroic mirror 2 is the blue light, the red light and the green light, in other words, the blue light, the red light and the green light are combined into one light by the dichroic mirror 2. Light (including blue light, red light and green light) emitted by the dichroic mirror 2 enters the beam splitter 1, and the beam splitter 1 splits the light from the dichroic mirror 2 into reference light 3 and object light 3.

Reference light 3 is incident on the reflector 2, is incident in the spatial filter 1 after the reflection of the reflector 2, and the spatial filter 1 filters and expands the reference light 2, and is incident in the Fourier lens 1 with the reference light 2 after filtering and expanding, and through adjusting the relative position between the spatial filter 1 and the Fourier lens 1, the reference light 3 that makes the Fourier lens 1 emergent is the parallel light. The reference light 3 emitted from the fourier lens 1 is incident on the beam splitter 2, and the beam splitter 2 transmits the reference light from the fourier lens 1 and emits the transmitted reference light onto the grating recording material.

The object light 3 is incident into the attenuation sheet, the light intensity of the object light 3 is attenuated, the attenuation sheet is used for enabling the object light 3 with the attenuated intensity to be incident onto the reflector 3, the object light is incident into the spatial filter 2 after being reflected by the reflector 3, the spatial filter 2 is used for filtering and expanding the object light 3, the object light 3 after being filtered and expanded is incident into the Fourier lens 2, and the convergence angle of the object light 3 emitted by the Fourier lens 2 is equal to the angle 3 shown in the figure 3 by adjusting the relative position between the spatial filter 2 and the Fourier lens 2. The object light 3 emitted from the fourier lens 2 is incident on the beam splitter 2, the beam splitter 2 reflects the object light from the fourier lens 2, so that the reflected object light 3 is incident on the grating recording material, and the reverse extension line of the boundary of the object light 3 reflected on the grating recording material intersects with a point on the left side of the grating recording material, and the point is equivalent to a virtual focus F in fig. 3₃。

In the manner shown in fig. 6, the photographing of the reference light 3 and the object light 3 on the grating recording material is completed. In other words, after going through the photographing process shown in fig. 6, the corresponding focal point of the grating recording material includes: focal point F shown in FIG. 3₁Focal length f₁0.125 m; the virtual focus F shown in FIG. 3₂Focal length f₂33.3cm, the virtual focus F shown in FIG. 3₃Focal length f₃20 cm. Suppose that: l is₁Is 40cm，L₂Is 5m, L₃At infinite distance. When a wearer looks at an object at 40cm by using the multifocal spectacles, the multifocal spectacle lens diffracts diffracted light 1, and the diffracted light 1 generates a focus F₁Corresponding focal length f₁0.125m, the glasses are 800 degrees distance vision glasses; when a wearer looks at an object with a distance of 5m by using glasses, the multifocal spectacle lens diffracts the diffracted light 2, and the diffracted light 2 generates a focus F₂Corresponding focal length f₂33.3cm, the glasses are 300 degree distance vision glasses; when a wearer looks at an object at infinity when using the glasses, the multifocal spectacle lenses will diffract the diffracted light 3, and the diffracted light 3 will generate the focus F₃Corresponding focal length f₃The glasses are 500 degree distance vision glasses, 20 cm.

After S130, an HOE having multiple focal powers (or may also be referred to as a focal point) can be obtained, which is an angle-multiplexed HOE having multiple focal points.

For example, in connection with the above example, the HOE has three different focal points, respectively focal point F₁Virtual focus F₂And a virtual focus F₃Different focal points correspond to different focal lengths.

It will be appreciated that S130, as well as fig. 4-6, illustrate a process of fabricating an HOE according to the HOE design process described in S110-S120.

It should be understood that the order of photographing the plurality of sets of light is not limited in the process of photographing on the same piece of grating recording material using the plurality of sets of light. The method and the device only need to shoot a plurality of groups of light on the same grating recording material in sequence, and the embodiment of the application is not limited herein.

And S140, manufacturing a multifocal spectacle lens by using the HOE.

After S140, angle multiplexed HOE-based multifocal ophthalmic lenses are produced.

For example, in combination with the specific examples in S110 to S130 described above, that is, when photographing is performed on a grating recording material, the object light and the reference light used are:

the reference light 1 and the object light 1 are arranged into a group, the reference light 1 is arranged into divergent light with a divergence angle of 4, and the object light 1 is arranged into divergent light with a focal length of 12.5cm and a divergence angle of 1;

the reference light 2 and the object light 2 are arranged into a group, the reference light 2 is arranged into divergent light with a divergent angle of 5, and the object light 2 is arranged into convergent light with a virtual focal length of 33.3cm and a convergent angle of 2;

the reference light 3 and the object light 3 are set as a set, the reference light 3 is set as parallel light, and the object light 3 is set as converging light with a virtual focal length of 20cm and a converging angle of 3.

The multifocal spectacle lenses have three different focal lengths or diopters corresponding to a distance vision power of 800 degrees, a near vision power of 300 degrees and a near vision power of 500 degrees, respectively.

The method for manufacturing the multifocal spectacle lenses provided by the embodiment of the application is used for manufacturing the multifocal spectacle lenses based on the angle multiplexing grating element technology. Shooting on the same grating recording material through a plurality of groups of preset light, and recording a grating on the grating recording material to obtain a grating element. Each set of light includes object light and reference light. The reference lights of different groups correspond to different preset viewing distances, the object lights in different groups correspond to the near-sighted degree or the far-sighted degree of a user, different object lights correspond to different preset focuses, each group of object lights and the reference lights correspond to one preset focus, and therefore the focuses corresponding to the multiple groups of lights respectively are recorded on the same grating recording material. The method can be used for manufacturing the grating element with a plurality of focuses, the grating element is used for manufacturing the multifocal spectacle lenses, the diopter controllable step change of the lenses is realized, the gradual change multifocal spectacle lenses with smaller step change range are realized, the visual fatigue caused by overlarge diopter change range during the switching of far vision and near vision is not easy to cause, the eyes are better protected, and the use efficiency and the user experience of the multifocal spectacle are improved.

Embodiments of the present application also provide a multifocal ophthalmic lens manufactured by the method of manufacturing a multifocal ophthalmic lens according to any of the embodiments of the present application, the multifocal ophthalmic lens having a plurality of different focal lengths (dioptres).

Embodiments of the present application also provide multifocal ophthalmic lenses that include any of the multifocal ophthalmic lenses provided by embodiments of the present application.

The multifocal spectacles provided by the embodiment of the application comprise multifocal lenses manufactured by a grating element technology based on angle multiplexing, and diopter controllable step change of the lenses is realized, so that the problems that the diopter change range of the multifocal spectacles is large and the FOV of human eyes is limited due to the fact that the lenses are divided into areas with different focal lengths in the prior art are solved, the progressive multifocal spectacles with smaller step change range are realized, the progressive multifocal spectacles can be better adapted to far vision, switching between different application conditions such as middle vision and near vision and the like can be used, visual fatigue caused by overlarge diopter change range when far vision and near vision are switched is less prone to being caused, eyes are better protected, and the use efficiency and the user experience of the multifocal spectacles are improved.

For example, in the case of combining the above examples, when the user actually uses the multifocal eyeglasses, if the reference light 1, the reference light 2, and the reference light 3 are given to the multifocal eyeglasses according to the characteristics of the diffractive optics (that is, when the user views different objects, the light reflected by the multifocal eyeglasses by the different objects is the reference light 1, the reference light 2, and the reference light 3), the HOE will diffract the diffracted light 1, the diffracted light 2, and the diffracted light 3 which completely match the design process. The diffracted light 1 will generate a focus F₁Corresponding focal length f₁0.125 m; the diffracted light 2 will generate a virtual focus F₂Corresponding focal length f₂33.3 cm; the diffracted light 3 will generate a virtual focus F₃Corresponding focal length f₃＝20cm。

For example as shown in fig. 7:

when a user wears the multifocal eyeglasses to see an object with the same distance as a preset distance L1 (e.g., 40cm), after light reflected by the object (with the same divergence angle as that of reference light 1) is diffracted by the spectacle lens of the multifocal eyeglasses, actual diffracted light is consistent with diffracted light 1 at the time of design, and the multifocal eyeglasses have corresponding diopter D1 (e.g., D1 is 8) or diopter (800-degree distance vision mirror);

when the user wears the multifocal eyeglasses to watch an object with the same distance as the preset distance L2 (for example, 5m), after the light reflected by the object (with the same divergence angle as the reference light 2) is diffracted by the spectacle lens of the multifocal eyeglasses, the actual diffracted light is consistent with the diffracted light 2 at the time of design, and the multifocal eyeglasses have corresponding diopter D2 (for example, D2-3) or diopter (300-degree myopia glasses);

when a user wears the multifocal spectacles to watch an object with the same distance as a preset distance L3 (such as infinity), after light (parallel light and the divergence angle of the reference light 3) reflected by the object is diffracted by the spectacle lenses of the multifocal spectacles, the actual diffracted light is consistent with the diffracted light 3 at the time of design, and has corresponding diopter D3 (such as D2-5) or diopter (500-degree myopia glasses);

in other words, the multifocal function is achieved by multifocal spectacles fabricated using the lenticular elements (e.g., HOEs) provided herein.

It should also be understood that, in the above example, only three sets of object light and reference light are taken as an example for illustration, and in other embodiments of the present application, a grating may also be recorded by shooting on the same piece of grating recording material with more sets of object light and reference light. For example, assume that the preset near-sightedness and far-sightedness powers of the vision correction user are respectively: 200 degrees of myopia, 250 degrees of myopia, 300 degrees of myopia, 350 degrees of myopia, 400 degrees of myopia, 450 degrees of myopia, 500 degrees of myopia, 550 degrees of myopia, 400 degrees of hyperopia, 500 degrees of hyperopia and 600 degrees of hyperopia, object lights corresponding to the myopia degrees and the hyperopia degrees respectively can be set respectively, namely, focal lengths corresponding to the myopia degrees and the hyperopia degrees exist, and the variation range among different focal lengths can be reduced. In this case, the number of different preset viewing distances of the user may be set to be the same as the number of the object lights, or may be greater than the number of the object lights, so that more groups of object lights and reference lights are respectively photographed on the same grating recording material, gratings are recorded, grating elements with more focal lengths are manufactured, and the multi-focal glasses manufactured by using the grating elements have more different focal lengths or diopters.

It will also be appreciated that if the wearer of the multifocal ophthalmic lenses has a single degree of distance vision and near vision, i.e. looks at objects at different distancesIn the case where there is only one far vision power and one near vision power, the focal length (or diopter) of the multiplexed near vision glasses may be set to f₁＝f₂＝……＝f_nSetting the focal length of the multiplex telescope to f₁’＝f₂’＝……＝f_n' that is, when a user looks at an object at a different location using the multi-focal spectacles, the spectacles have only two focal lengths (or may also be referred to as diopters or focal points): myopia glasses f₁And a distant vision mirror f₁'. In this case, the number of object lights is two (one corresponding to far-vision power and one corresponding to near-vision power), and the number of different viewing distances of a preset user may be more than two, and when photographing is performed on the same piece of grating recording material using a plurality of sets of lights, each of which includes one object light and one reference light, the number of the plurality of sets of lights and the number of the viewing distances are the same, and among the plurality of sets of lights, there are several sets of lights having the same focal point or diopter (i.e., the object lights in the plurality of sets of lights are all the same).

It should also be understood that in the embodiment of the present application, when the n reference lights and the n object lights can be combined at will and then photographed on the same grating recording material, it is only necessary to satisfy that one object light corresponds to one reference light.

For example, in the above example, the object beam 1 may be set as a set with the reference beam 2, or the object beam 1 may be set as a set with the reference beam 3;

alternatively, the object beam 2 may be set as a group with the reference beam 1, or the object beam 2 may be set as a group with the reference beam 3;

alternatively, the object beam 3 may be provided as a group with the reference beam 1, or the object beam 3 may be provided as a group with the reference beam 2.

Alternatively, in the above example, it is assumed that there are only two object lights (object light 1 and object light 2), that is, two different degrees correspond to the user, and in this case, when 3 reference lights and 2 object lights can be combined at will and photographed on the same piece of grating recording material, one object light may correspond to a plurality of reference lights. For example: it is also possible to provide: the object light 1 and the reference light 1 are set as one group, the object light 1 and the reference light 2 are set as one group, and the object light 2 and the reference light 3 are set as one group. In this case, three sets of light correspond to two focal points, wherein the focal points corresponding to two sets of light including the object light 1 are the same, and the grating element obtained after photographing the same piece of grating recording material using the three sets of light has two different focal points.

It should also be understood that in the above embodiment, during shooting on the same piece of grating recording material, only shooting is performed with three wavelengths, namely RGB for each set of reference light and object light, so that the grating element made of the grating recording material can be used without color difference during use, and can be used with better effect by multiplexing with wavelengths. It should be understood that in other embodiments of the present application, the light sources for generating the reference light and the object light may be other types or forms of light sources, and the present application is not limited thereto.

It should also be understood that, in the embodiment of the present application, grouping and multiplexing a plurality of different reference lights according to different preset distances when a user views different objects may cause that the grouping during the shooting process is not fine enough, and the object viewed by the user using the multi-focus glasses is exactly between the two preset distances, which may cause that the actual diopter (or degree) of the focus glasses does not accord with the preset value. For example: suppose L corresponding to reference light 1₁(preset distance to an object when viewing the object using glasses) is set to 20cm, and L corresponds to reference light 2₂Set to 40cm (preset distance to the object when watching the object by using the glasses), and the user watches the object at the distance of 30cm by using the multi-focus glasses when actually using, at this time, the diopter of the multi-focus glasses is not equal to L₁Focal length f corresponding to object light 1 of the same group₁Nor with L₂Focal length f corresponding to object light 2 of the same group₂. This is due to the fact that the preset used distance subdivision is not fine enough. According to the multiplexing theory, the multiplexing times are not limited to specific times, therefore, in other embodiments of the present application, the preset distance for viewing the object can be determined according to the distance range and the fineness requirement of the preset viewing object when in useThe distance is divided more finely, so that the distance from the user to view the object in actual use is included in the preset distance from the user to view the object. For example, the preset distance from the object when the object is viewed is as follows: 20cm, 30cm, 40cm, etc., so that, when a user views an object at a distance of 30cm using the multifocal lenses in actual use, the diopter of the multifocal lenses is a diopter corresponding to a preset 30 cm.

In addition, when the distance to the preset object is refined to a sufficient degree when the object is viewed, and the actual distance L of the object is not the same as the preset distance when the object is viewed, for example: preset L₁＝20cm，L₂22cm, and the actual user views the object at a position of 21cm, the change of the focal point F or focal length F of the multifocal spectacles caused by the change is extremely small, and the change of the power caused by the change is far less than 50 degrees, and even if the person with the abnormal diopter adjustment capability (such as the myopic eye or the hyperopic eye), the eye of the person has a diopter self-adaptive range (generally greater than or equal to 50 degrees), so the change of the focal point F or focal length F caused by the change is completely in the diopter self-adaptive range of the human eye (including the person with the abnormal diopter adjustment capability), and the realization and the use of the multifocal spectacles function are not influenced.

It should be understood that the above description is only for the purpose of helping those skilled in the art better understand the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application. Various equivalent modifications or changes will be apparent to those skilled in the art from the examples given above, for example, some steps in the methods described above may not be necessary, or some steps may be newly added, etc. Or a combination of any two or more of the above embodiments. Such modifications, variations, or combinations are also within the scope of the embodiments of the present application.

It should also be understood that the various numerical references referred to in the examples of the present application are merely for ease of description and distinction and are not intended to limit the scope of the examples of the present application. The sequence numbers of the above processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not be limited in any way to the implementation process of the embodiments of the present application.

It is also to be understood that the terminology and/or the description of the various embodiments herein is consistent and mutually inconsistent if no specific statement or logic conflicts exists, and that the technical features of the various embodiments may be combined to form new embodiments based on their inherent logical relationships.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, apparatuses and units described above may refer to the corresponding processes in the foregoing embodiments, and are not described herein again.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of making a multifocal ophthalmic lens, the method comprising:

shooting on the same grating recording material by using N groups of light to obtain a grating element with a plurality of focuses;

manufacturing a multifocal spectacle lens by using the grating element;

each of the N groups of lights includes an object light and a reference light, the object light in each group of lights corresponds to a near vision power or a far vision power of a user, the reference light in different groups of lights corresponds to different preset viewing distances, each group of lights corresponds to a focus, the N groups of lights correspond to M focuses, M is an integer less than or equal to N, the reference light in the N groups of lights includes a parallel reference light and a non-parallel reference light, the preset distance corresponding to the parallel reference light is infinity, M is an integer greater than or equal to 2, and the multifocal spectacle lens has M different focuses.

2. The method of claim 1, wherein prior to taking a shot on the same piece of lenticular recording material with N sets of light, the method further comprises:

determining M object lights according to the myopia degree and the hyperopia degree of the user, wherein the sum of the number of the myopia degree and the number of the hyperopia degree is M;

determining N reference lights corresponding to N different preset viewing distances;

and respectively combining any one of the N reference lights and any one of the M object lights to obtain the N groups of lights.

3. The method of claim 2, wherein when N and M are equal, the object rays in any two sets of rays are different, the different object rays corresponding to different degrees of near or far vision of the user, the different sets of rays corresponding to different focal points; alternatively, the first and second electrodes may be,

when N and M are not equal, the corresponding focuses of the multiple groups of light comprising the same object light are the same, and the corresponding near vision power or far vision power of the same object light to the user is the same.

4. The method of claim 2 or 3, wherein said determining M object lights from the user's near and far vision powers comprises:

according to the near vision degree and the far vision degree of the user, determining a focus and a focal length which respectively correspond to each near vision degree and each far vision degree;

determining a diffraction light divergence angle or a diffraction light convergence angle corresponding to each focus according to the focus corresponding to each myopia degree and each hyperopia degree;

determining the divergence angle or the convergence angle of the object light corresponding to each diffraction light according to the divergence angle or the convergence angle of each diffraction light, wherein the number of the diffraction lights is M;

and determining the M object lights according to the divergence angles or the convergence angles corresponding to the M object lights respectively.

5. The method of claim 4, wherein said taking a picture on the same piece of lenticular recording material using N sets of light comprises:

generating a first light beam by using a laser light source, and enabling the first light beam to be incident into a first beam splitter;

the first beam splitter splits the first light beam into first reference light and first object light, the first reference light and the first object light are any one of the N groups of light, the first beam splitter makes the first reference light incident into a first reflector and makes the first object light incident into a second reflector, the first reference light is any one of the N reference lights, and the first object light is any one of the M object lights;

the first reflector is used for making the first reference light incident into a first spatial filter, the first spatial filter is used for making the first reference light incident into a first Fourier lens, the first Fourier lens is used for making the first reference light incident into a second beam splitter, the divergence angle or the convergence angle of the first reference light incident into the second beam splitter by the first Fourier lens is the same as that of the first reference light, and the second beam splitter is used for transmitting the first reference light from the first Fourier lens onto the grating recording material;

the second reflector emits the first object light into a second spatial filter, the second spatial filter emits the first object light into a second fourier lens, the second fourier lens emits the first object light into the second beam splitter, a divergence angle or a convergence angle of the first object light emitted from the second fourier lens into the second beam splitter is the same as a divergence angle or a convergence angle of the first object light, and the second beam splitter reflects the first object light emitted from the second fourier lens onto the grating recording material.

6. The method of claim 5, wherein the laser light source comprises: red laser light source, blue laser light source, green laser light source, the method still includes:

the red light laser light source emits the generated red light into a third reflector, the third reflector reflects the red light into a first dichroic mirror, the first dichroic mirror transmits the red light into a second dichroic mirror, and the second dichroic mirror reflects the red light into the first beam splitter;

the green laser light source emits the generated green light into the first dichroic mirror, the first dichroic mirror reflects the green light into the second dichroic mirror, and the second dichroic mirror reflects the green light into the first beam splitter;

the blue light laser light source emits the generated blue light into the second dichroic mirror, and the second dichroic mirror transmits the blue light into the first beam splitter.

7. The method of any of claims 1 to 3, wherein the grating element comprises: any one of HOE, DOE, surface relief grating and super surface grating structure.

8. A multifocal ophthalmic lens produced by a method for producing a multifocal ophthalmic lens according to any one of claims 1 to 7, said multifocal ophthalmic lens having M distinct foci, M being an integer greater than or equal to 2.

9. Multifocal ophthalmic lens, characterized in that it comprises a multifocal ophthalmic lens according to claim 8, said multifocal ophthalmic lens having M distinct foci, M being an integer greater than or equal to 2.