CN114326151B - Method for producing multifocal spectacle lenses and multifocal spectacles - Google Patents

Abstract

The application provides a method for manufacturing a multifocal spectacle lens and multifocal spectacles, wherein the method comprises the following steps: shooting with N groups of light on the same piece of grating recording material to obtain a grating element with a plurality of light focuses, wherein the grating element can be an HOE or a DOE; manufacturing a multifocal spectacle lens by utilizing the grating element; each of the N groups of light includes object light and reference light, the object light in different groups corresponds to a near vision degree or a far vision degree (i.e. diopter) of a user, the reference light in different groups corresponds to different preset viewing distances, and each group 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 service efficiency and the user experience of the multifocal spectacles are improved.

Description

Method for producing multifocal spectacle lenses and multifocal spectacles

Technical Field

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

Background

Progressive addition lenses (or alternatively referred to as multifocal lenses) can have different optical powers required for looking at distance, intermediate distance and near distance simultaneously. A pair of multifocal spectacles corresponds to a plurality of spectacles of different powers. The multifocal glasses solve the trouble that vision correcting people need different diopters to see objects with different distances and frequent glasses replacement is needed. A pair of multifocal spectacles can be used for watching objects at far positions and objects at middle distances and also can be used for watching objects at near positions.

At present, a multifocal function is generally realized by partitioning a multifocal spectacle lens in such a way that different areas correspond to different focal lengths (or may also be called diopters or focuses), but in this way, because the area of the spectacle lens is limited, the multifocal spectacle lens cannot be partitioned into a plurality of areas, so that a great jump change exists between focal lengths (or diopters) corresponding to the different areas respectively, and a user wears the multifocal spectacle lens manufactured by using the method for a long time, so that fatigue of eyes is caused, and eye health is damaged. In addition, when the multi-focus glasses are used, the area of one area can be always used at the same time, so that the angle of view (FOV) of human eyes is greatly limited, the use in an actual scene is affected, 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, wherein the multifocal lenses are manufactured based on angle multiplexing grating element technology, the controllable step change of diopter 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 method can be better suitable for switching use among different application conditions such as hyperopia, middle vision and myopia, visual fatigue caused by overlarge diopter change amplitude during the switching of hyperopia and myopia 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 piece of grating recording material by utilizing N groups of light to obtain a grating element with a plurality of focuses; manufacturing a multifocal spectacle lens by utilizing the grating element; each of the N groups of light comprises object light and reference light, the object light in each group of light corresponds to the myopia degree or the hyperopia 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 corresponds 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 infinity, M is an integer larger than or equal to 2, and the multi-focus spectacle lens has M different focuses.

The method for manufacturing a multifocal spectacle lens according to the first aspect is a method for manufacturing a multifocal spectacle lens, wherein a predetermined plurality of sets of light are captured on the same grating recording material, and a grating is recorded on the grating recording material, thereby obtaining a grating element having a plurality of focuses (which may also be referred to as optical focuses). 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 corresponds to the myopia degree or hyperopia degree of a user, the different object light corresponds to different preset focuses (or diopters or focal distances), each group of object light and the reference light corresponds to one preset focus, and focuses corresponding to multiple groups of light respectively are recorded on the same grating recording material. In this way a grating element with multiple focal points (or also called focal lengths, diopters) can be made. And then, the grating element is used for manufacturing the multifocal spectacle lens, so that the problems of large diopter change amplitude and limiting of the FOV of human eyes caused by the multifocal lens manufactured by dividing the lens into areas with different focal lengths in the prior art are solved, the gradual change multifocal lens with smaller step change range is realized, the gradual change multifocal spectacle lens can be better adapted to the switching use among different application conditions such as hyperopia, middle vision and myopia, the visual fatigue caused by overlarge diopter change amplitude during the switching of the hyperopia and the myopia is not easy to be caused, the eyes are better protected, and the use efficiency and the user experience of the multifocal spectacle are improved.

Illustratively, in an embodiment of the present application, the grating element may include: any one of HOE, DOE, surface relief grating, 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 HPDLC, for example), or the like.

In a possible implementation manner of the first aspect, before shooting on the same piece of grating recording material with N sets of light, the method further includes: according to the myopia degree and the hyperopia degree of a user, M object lights are determined, and 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 N groups of lights.

In a possible implementation manner of the first aspect, when N and M are equal, object light in any two groups of light corresponds to a user with different myopia or hyperopia degrees, and focal points corresponding to different groups of light 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 lights including the same object light are the same, and the myopia degree or hyperopia degree corresponding to the same object light is the same for the user. I.e. there are two or more groups of light corresponding to the same focal point among the N groups of light.

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

In a possible implementation manner of the first aspect, shooting with N sets of light on the same piece of grating recording material includes: generating a first light beam by using a laser light source, and making the first light beam incident into a first beam splitter; the first beam splitter splits a first light beam into first reference light and first object light, wherein the first reference light and the first object light are any one of N groups of light, the first beam splitter makes the first reference light incident into the first reflector, makes the first object light incident into the second reflector, the first reference light is any one of N reference lights, and the first object light is any one of N object lights; the first reflector is used for making the first reference light incident into the first spatial filter, the first spatial filter is used for making the first reference light incident into the first Fourier lens, the first Fourier lens is used for making the first reference light incident into the second beam splitter, the divergence angle or convergence angle of the first reference light incident into the second beam splitter by the first Fourier lens is the same as the divergence angle or convergence angle of the first reference light in the N reference lights, and the second beam splitter is used for transmitting the first reference light from the first Fourier lens to the grating recording material; the second reflector is used for making the first object light incident into the second spatial filter, the second spatial filter is used for making the first object light incident into the second Fourier lens, the second Fourier lens is used for making the first object light incident into the second beam splitter, the divergence angle or convergence angle of the first object light incident into the second beam splitter by the second Fourier lens is the same as the divergence angle or convergence angle of the first object light in the N object lights, and the second beam splitter is used for reflecting 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: a red laser source, a blue laser source, a green laser source, the method further comprising: the red laser light source emits the generated red light into a third reflecting mirror, the third reflecting mirror 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 a first beam splitter; the green laser light source emits the generated green light into a first dichroic mirror, the first dichroic mirror reflects the green light into a second dichroic mirror, and the second dichroic mirror reflects the green light into a first beam splitter; the blue laser light source emits the generated blue light into a 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 made by the method of the first aspect, or of any one of the possible implementations of the first aspect, the multifocal ophthalmic lens having M different focal points.

The multifocal spectacle lens provided in the second aspect has a plurality of different focal lengths (or diopters), so that the problems of large diopter change amplitude and limiting of the FOV of eyes caused by utilizing a multifocal lens manufactured by dividing the lens into areas 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 the switching use among different application conditions such as hyperopia, middle vision and myopia, and visual fatigue caused by overlarge diopter change amplitude during the switching of hyperopia and myopia is also difficult to be caused, eyes are better protected, and the use efficiency and user experience of the multifocal lens are improved.

In a third aspect, there is provided a multifocal ophthalmic lens comprising a multifocal ophthalmic lens provided in the second aspect described above, the multifocal ophthalmic lens having M different focal points, M being an integer greater than or equal to 2.

The multifocal spectacles provided by the third aspect realize gradual change multifocal spectacles with smaller step change range, can be better adapted to switching use among different application conditions such as hyperopia, middle vision and myopia, is not easy to cause visual fatigue caused by overlarge diopter change amplitude during switching of hyperopia and myopia, protects eyes better, and improves the use efficiency and user experience of the multifocal spectacles.

In a fourth aspect, there is provided a method of using a multifocal ophthalmic lens comprising a multifocal ophthalmic lens provided in the second aspect described above, the multifocal ophthalmic lens having M different focal points, the method comprising:

determining a distance from a viewing object when using the multifocal eyewear; when the distance is equal to a first preset distance in the preset viewing distances, the focal length of the multi-focus glasses is a first focal length corresponding to the first preset distance, and the degree of the multi-focus glasses is a near-vision degree or a far-vision degree corresponding to the first focal length.

In the method for using the multifocal spectacles provided in the fourth aspect, when the distance between the user and the object is the same as any one of the preset viewing distances in the process that the user uses the multifocal spectacles to see the objects at different distances, diffracted light corresponding to the preset distances 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 multifocal spectacles is realized.

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

In a possible implementation manner of the fourth aspect, when N and M are equal, the object light in any two groups of light is different, different object light corresponds to different myopia or hyperopia degrees of the user, and the focus corresponding to different groups of light is different; or when N and M are not equal, the focuses of the multiple groups of lights including the same object light are the same, and the myopia degree or hyperopia degree of the user corresponding to the same object light is the same.

Drawings

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

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

Fig. 3 is a schematic diagram of determining optical paths of object light and reference light in a design process according to another embodiment of the present application.

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

Fig. 5 is a schematic diagram of an optical path of an example of the reference light 2 and the object light 2 in the process of photographing on the grating recording material according to the embodiment of the present application.

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

Fig. 7 is a schematic view of an optical path when a user uses multifocal spectacles according to an embodiment of the present application.

Detailed Description

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

In the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in the description of the embodiments of the present application, "plurality" means two or more than two.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

Progressive multifocal spectacles were invented by "line of sight" in 61 years ago, which was named "Wanli" in line of sight. The multi-focus glasses are characterized in that the distance light area and the near light area of the same lens are organically connected together in a way of gradually changing diopter from the distance power to the near power, so that different diopters required for watching distance, medium distance and near distance can be simultaneously provided on one lens. A pair of multifocal spectacles corresponds to a plurality of spectacles of different powers.

The multifocal glasses solve the trouble that the middle-aged and the elderly need to change glasses frequently because different diopters are needed for looking at objects with different distances. A pair of multifocal spectacles can be used for watching objects at far positions and objects at middle distances and also can be used for watching objects at near positions.

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

The distance viewing area is the degree required by the object at the distance, and is positioned at the upper part of the lens. The near zone is the power required to see the near object, and is located in the lower portion of the lens. The portion connecting the near zone and the far zone is the middle zone (or may also be referred to as the progressive zone), which will allow the middle zone to be used to see objects at a clear distance. 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, the progressive addition lens is not different from the normal lens.

In the technical scheme shown in fig. 1, the lens of the glasses is divided into three areas with different diopters through optical design, so as to achieve the purpose of realizing the multifocal glasses. However, in the scheme shown in fig. 1, although three different areas on the same lens correspond to different focal lengths respectively, the difference between the focal lengths corresponding to the three different areas is relatively large, so that a great jump change exists between the focal lengths (or diopters) corresponding to the three areas respectively, and a user wears the multifocal glasses manufactured by using the method for a long time, so that fatigue of eyes is caused, and eye health is damaged. In addition, since the lens area of the glasses is limited, the variation range of diopter of different areas cannot be reduced to a smaller range by a zoning mode.

On the other hand, the lens is divided into three different areas, so that the area of one area can always be used at the same time when the glasses are used, the angle of view (FOV) of human eyes is greatly limited, and the use in actual scenes is influenced (for example, when a user uses outdoor scenes, dangers such as falling or car accidents easily occur due to insufficient external scenes). In addition, due to the limited lens area, the lens is divided into three areas with different focal lengths, so that more observation areas with different focal lengths (or focal points) cannot be realized, and the use efficiency of the multifocal spectacles is reduced.

Currently, the related art may also divide the lens into more areas. 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 distance vision zone, the near distance vision zone and the intermediate distance vision zone are respectively three areas with different diopters, the area between the distance vision zone and the intermediate distance vision zone is a first gradual change area, and the area between the intermediate distance vision zone and the near distance vision zone is a second gradual change area. By adopting the mode, the diopter difference between two adjacent visual areas is stepped to have an excessive area, so that the progressive multifocal glasses in the true sense are realized, 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 always use the area of one area at the same time when using the lens, so that the FOV of eyes is limited more, and the use in an actual scene is influenced (for example, when the user uses an outdoor scene, dangers such as falling or car accidents easily occur due to incomplete external views). In addition, due to the fact that the area of the glasses lens is limited, the lens is divided into three visual areas and two gradually-changed areas and other limited multi-focus areas, observation areas with more focal distances (or focal points) cannot be achieved, and the service efficiency of the multi-focus glasses is reduced.

In view of the above, the present application provides a method for manufacturing a lens of a multifocal spectacle and a multifocal spectacle, which manufacture a multifocal lens based on an angle multiplexing grating element technology, and realize controllable step change of diopter of the lens, and manufacture a multifocal spectacle by using the lens, thereby solving the problems of large diopter change amplitude and limiting FOV of eyes caused by using a multifocal spectacle manufactured by dividing the lens into different focal length areas in the prior art, realizing a progressive multifocal spectacle with a smaller step change range, being capable of better adapting to switching use among different application conditions such as hyperopia, middle vision and myopia, and being difficult to cause visual fatigue caused by overlarge diopter change amplitude during switching of hyperopia and myopia, better protecting eyes, and improving use efficiency and user experience of the multifocal spectacle.

The method for manufacturing the multifocal spectacle lens provided by the application comprises the steps of shooting a plurality of preset groups of light on the same grating recording material, and recording a grating on the grating recording material to obtain a grating element (the grating element can also be called as a grating film, a grating optical element and the like) with a plurality of light focuses (the light focuses can also be called as focuses). 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 myopia degree or the hyperopia degree of a user, the myopia degree or the hyperopia degree corresponding to different object light is different, the different object light corresponds to different preset focuses (or can also be called diopters or focal lengths), the different object light has different divergence angles or convergence angles, each group of light corresponds to one preset focus, so that focuses corresponding to multiple groups of light respectively are recorded on the same piece of grating recording material, and a grating element with multiple focuses (or can also be called focal lengths or diopters) can be manufactured in this way. Then, the grating element is used to manufacture multifocal spectacle lenses. In the process that a user uses the multi-focus glasses to watch objects at different distances, when the distance between the user and the object is the same as any one of preset watching distances, diffracted light corresponding to the preset distances 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-focus glasses is realized.

Alternatively, in an embodiment of the present application, the grating element may include: holographic optical element (holographic optical elements, HOE), diffractive optical element (difractive optical element, DOE), surface relief grating, super surface grating structure. It should be understood that this should not be limiting with respect to the grating elements of 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 herein.

The method of making a multifocal ophthalmic lens provided herein is described below with reference to specific examples.

Fig. 2 is a schematic flow chart of an example of a method of making a multifocal ophthalmic lens provided herein. As shown in fig. 2, the method includes: s110 to S140.

And S110, determining a plurality of different object lights according to the myopia degree and the hyperopia degree of the user.

In some possible implementations, the divergence or convergence angle corresponding to each of the plurality of different object lights may be determined based on the near vision power and the far vision power (or diopters) of a vision correcting user (or user).

In other possible implementations, the near-vision degree and far-vision degree applicable to the multifocal glasses may be preset in advance, and then the divergence angle or the convergence angle corresponding to the different object lights may be determined according to the preset near-vision degree and far-vision degree.

The case of correcting the user's near-sightedness and far-sightedness will be described below as an example.

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

S111, determining focuses and focal lengths corresponding to different degrees respectively according to the myopia degree and the hyperopia degree of the user.

For example, a plurality of different lens focal lengths may be determined according to the following equations (1) and (2).

S＝100×D (2)

In formula (1), f represents a focal length, D represents diopter in formula (1) and formula (2), and S represents the power of glasses in formula (2). For the myopic degree, f and D are both negative, which means that the lens is set as a myopic lens (or concave lens) without a real focus, and the focus of the lens is a virtual focus, and the focal length is the focal length of the virtual focus. For presbyopia degrees, both f and D are positive, meaning that the lens is configured as a presbyopic lens (or convex lens) with (and in) a real focal point, the focal length being that of the real focal point.

Since the myopic and hyperopic eye numbers of the vision correction user can be determined in advance, the diopter can be determined according to the myopic and hyperopic eye numbers S of the correction user, and the focal lengths corresponding to the different diopters can be further determined according to the calculated diopters.

For example. Assume that: the vision correcting user has a far vision power of 800 degrees and a near vision power of 300 degrees and 500 degrees, respectively.

For a distance vision power of 800 degrees. Calculated using equations (1) and (2): f (f) ₁ ＝0.125m，D ₁ =8, where f ₁ It is also understood that when a user looks at an object using glasses with a far vision power of 800 degrees, the light reflected by the object is incident on the focal length of the diffracted light behind the glasses lens.

For a myopic degree of 300 degrees. Calculated using equations (1) and (2): f (f) ₂ ＝-0.333m，D ₂ = -3, wherein f ₂ It can also be understood that when a user looks at an object using glasses with a degree of myopia of 300 degrees, light reflected by the object is incident on the focal length of diffracted light behind the glasses lens.

For a myopic degree of 500 degrees. Calculated using equations (1) and (2): f (f) ₃ ＝-0.2m，D ₃ = -5, wherein f ₃ It is also understood that when a user looks at an object using glasses with a degree of myopia of 500 degrees, light reflected by the object is incident on the focal length of diffracted light behind the glasses lens.

Exemplary, in the present embodiment, focal length f ₁ F for corresponding focus ₁ Indicating the focal length f ₂ F for corresponding focus ₂ Indicating the focal length f ₃ F for corresponding focus ₃ And (3) representing. F (F) ₁ The corresponding distance vision degree is 800 degrees, which is the real focus; f (F) ₂ Corresponding to a myopia degree of 300 degrees, which is a virtual focus, F ₃ The corresponding myopia degree is 500 degrees, which is the virtual focus.

Focus F ₁ Distance from grating element (focal length f ₁ ) 0.125m, focus F ₂ Distance from grating element (focal length f ₂ ) 0.333m, focus F ₃ Distance from grating element (focal length f ₃ ) 0.2m.

S112, determining the divergence angle or convergence angle of the diffracted light according to the focuses or focal lengths corresponding to the 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 convergence angle of the diffracted light can be extrapolated.

It will be appreciated that the angle of divergence or convergence of diffracted light for different focal points is different.

In the following description, the method of the present application will be specifically described using the grating element as an HOE, 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 herein.

In some possible embodiments of the present application, since the relative positions of the grating elements (HOE for example) placed at the time of photographing fabrication and at the time of use are the same, the determined and unique HOE area region of the preset fabrication can be determined. For example, fig. 3 is a schematic diagram illustrating an example of determining the optical paths of object light and reference light during the design process, and the process shown in fig. 3 can be understood as an optical path diagram during the HOE design stage, not an actual optical path diagram when glasses made of the HOE are actually used.

As shown in fig. 3, the portion of the HOE with the shadow is a pre-set HOE area (or may also be referred to as an effective area of the HOE) that is set in advance, and the relative positions of the HOE are the same when the HOE is used and is photographed, so that the boundary line of the diffracted light can be determined from a plurality of known different focuses or focal lengths, and the convergence angle or divergence angle of the diffracted light can be determined.

For example, in combination with the above example, in S111, F has been determined ₁ 、F ₂ 、F ₃ (or f) ₁ 、f ₂ 、f ₃ ) Then it can be separately determined with F ₁ 、F ₂ 、F ₃ The respective boundary lines of the diffracted light 1, the diffracted light 2, and the diffracted light 3, as shown in fig. 3, further from the boundary lines of the diffracted light 1, the diffracted light 2, and the diffracted light 3, the divergence angle or convergence angle of the diffracted light 1, the diffracted light 2, and the diffracted light 3 can be determined. As shown in FIG. 2, angle 1 represents F ₁ Corresponding toThe divergence angle of the diffracted light 1 of (2) is equal to F ₂ The corresponding convergence angle of diffracted light 2, angle 3 representing the sum F ₃ The corresponding convergence angle of the diffracted light 3.

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

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

According to the characteristics of the diffraction optics, the divergence angle or the convergence angle of the diffraction light during use is determined by the divergence angle or the convergence angle of the object light, and the boundary of the diffraction light and the boundary of the object light are collinear, so that the divergence angle or the convergence angle of the diffraction 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 diffraction light, thereby further determining a plurality of object lights.

For example, in connection with the above example, as shown in fig. 3, object light 1, object light 2, and object light 3 shown in fig. 3 are boundary lines of object light. 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 the divergence angle of the object light 1 is further determined, wherein an 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 the convergence angle of the object light 2 can be further determined, wherein the included angle formed by the boundary 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 boundary of the object light 3 is the angle 3 (i.e., the convergence angle of the object light 3). After the divergence angle or convergence angle of the object light is determined, and thus three different object lights are determined.

S120, determining a plurality of different reference lights according to different preset distances of objects watched by using the glasses.

When a user views an object by using the multi-focus glasses, the method can preset in advance: a plurality of different distances between the multifocal spectacle lenses (made of grating elements HOE) and the objects being viewed in a multifocal spectacle scene are used.

For example, assume that: when the multifocal spectacles are used in a preset mode, the distance between the multifocal spectacles (namely the grating elements) and the object is L respectively ₁ 、L ₂ 、L ₃ ，L ₁ Representing a user viewing L using multifocal eyewear ₁ Objects at a distance, L ₂ Representing a user viewing L using multifocal eyewear ₂ Objects at a distance, L ₃ Representing a user viewing L using multifocal eyewear ₃ Object at distance, assuming: l (L) ₁ 40cm, L ₂ 5m, L ₃ Representing an infinite distance. In other words, L ₁ Indicating the distance between the HOE and the object is short distance, L ₂ Representing the distance between the HOE and the object as the intermediate distance, L ₃ Representing the distance between the HOE and the object at infinity. Since the position of the HOE is fixed and the area photographed on the HOE is also set in advance, according to L ₁ 、L ₂ 、L ₃ Can respectively determine and be L ₁ 、L ₂ 、L ₃ Corresponding to different reference light boundaries, e.g. as shown in FIG. 3, with L ₁ Corresponding to reference light 1 and L ₂ Corresponding to reference light 2 and L ₃ Corresponding to reference light 3. After determining the boundaries of different reference lights, the divergence angle or convergence angle of the different reference lights can be determined, and after determining the divergence angle or convergence angle of the reference lights, a plurality of reference lights can be further determined. In other words, the divergence angle or convergence angle of the different reference lights is determined according to different preset use distances.

For example, as shown in fig. 3, the divergence angle of the reference light 1 is the angle 4, the divergence angle of the reference light 2 is the angle 5, and since the reference light 3 is parallel light, the divergence angle corresponding to the reference light 3 is 0 degrees, that is, three different reference lights are determined.

It will be appreciated that in embodiments of the present application, L ₁ And L ₂ Other values are also possible, provided that L is satisfied ₁ Is less than L ₂ As long as the values of (2) are given, the examples of the present application are not limited herein.

It is to be appreciated that S110 through S120 describe the process for the HOE design phase.

And S130, shooting the same piece of grating recording material by utilizing 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.

Illustratively, in the embodiment of the present application, the grating recording material may be classified into: soft film materials (lower hardness) and dry plate materials (higher hardness); the components and reaction mechanisms can be divided into: a grating recording material made of silver salt, photopolymer, or polymer dispersed liquid crystal (including HPDLC, for example), or the like. It should be understood that in other embodiments of the present application, the grating recording material may be made of other similar materials, and 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 exposing (shooting) the grating recording material may also be a DOE, a surface relief grating, or a super-surface grating structure, according to the process of manufacturing and exposing the grating recording material, which embodiments of the present application are not limited herein. In the following examples, an example will be described in which a grating element obtained by exposure on a grating recording material is referred to as HOE.

For example, in the embodiment of the present application, a group of light is formed by using any one of the above-determined plurality of different object lights and any one of the plurality of different reference lights, and all the group of light is used to photograph on the same piece of grating recording material, and a grating (holographic grating) is recorded on the grating recording material, so as to obtain the HOE.

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

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

the reference light 2 and the object light 2 are set as a group, the reference light 2 is set as divergent light with a divergence angle of angle 5, and the object light 2 is set as a virtual focal length f ₂ A converging light with a converging angle of 2 and a converging angle of 33.3 cm;

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

it should be understood that, in the above example, the case where the number of reference lights is the same as the number of object lights is taken as an example, for example: the reference lights are respectively: and L is equal to ₁ The corresponding reference light 1; and L is equal to ₂ The corresponding reference light 2; and L is equal to ₃ Corresponding to reference light 3. The object light is respectively as follows: the object light 1 is set as a focal length f ₁ A divergence angle of 12.5cm and a divergence angle of 1. The object light 2 is set as a virtual focal length f ₂ A converging light with a converging angle of 2 and a converging angle of 33.3 cm; the object light 3 is set as a virtual focal length f ₃ 20cm, and a converging angle of angle 3. Thus, the above three groups of light are respectively composed, and the three groups of light 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 also be different, for example, the number of reference lights may be greater than the number of object lights.

For example: assume that: the object light is respectively as follows: the object light 1 is set as a focal length f ₁ Divergent light of 12.5cm with a divergence angle of 1; the object light 2 is set as a virtual focal length f ₂ A converging light with a converging angle of 2 and a converging angle of 33.3 cm; the object light 3 is set as a virtual focal length f ₃ 20cm, and a converging angle of angle 3. And the reference light is: and L is equal to ₁ Corresponding to reference light 1 and L ₂ Corresponding to reference light 2 and L ₃ Corresponding to the reference light 3 and L ₄ The corresponding reference light 4; wherein L is ₁ 、L ₂ 、L ₃ 、L ₄ Corresponding to different preset viewing distances, in this case, four groups of light can be combined, wherein the object light in two groups of light are identical, the two groups of light correspond to the same focal point (diopter), and the four groups of light correspond to threeA different focus or diopter. In other words, the number of groups of light combined is determined by the number of reference lights, 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 (diopters) corresponding to the two groups of light are the same.

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

Fig. 4 is a schematic diagram of an optical path of an example of the reference light 1 and the object light 1 provided in the present application in a process of photographing on a grating recording material.

As shown in fig. 4, laser B is used to generate blue light, laser G is used to generate green light, and laser R is used to generate red light. The red light generated by the laser R is incident on the reflecting mirror 1, reflected by the reflecting mirror 1 and then incident on the dichroic mirror 1, the green light generated by the laser G is also incident on the dichroic mirror 1, the dichroic mirror 1 is used for reflecting the green light and transmitting the red light, and therefore, the light emitted by the dichroic mirror 1 is red light and green light. The dichroic mirror 1 emits red light and green light to be incident into the dichroic mirror 2, and the blue light generated by the laser B is also incident into the dichroic mirror 2, and the dichroic mirror 2 is configured to transmit the blue light and reflect the red light and the green light, so that the light emitted from the dichroic mirror 2 is the blue light, the red light, and the green light, in other words, the dichroic mirror 2 combines the blue light, the red light, and the green light into one light. The light (including blue light, red light, and green light) emitted from the dichroic mirror 2 is incident on 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.

The reference light 1 is incident on the reflecting mirror 2, reflected by the reflecting mirror 2 and then incident on the spatial filter 1, the spatial filter 1 filters and expands the reference light 1, and the filtered and expanded reference light 1 is incident on the fourier lens 1, and the relative position between the spatial filter 1 and the fourier lens 1 is adjusted so that the divergence angle of the reference light 1 emitted from the fourier lens 1 is equal to the angle 4 shown in fig. 3. The reference light 1 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 then the transmitted reference light 1 is incident on the grating recording material.

The object light 1 is incident into an attenuation sheet, the light intensity of the object light 1 is attenuated, the attenuation sheet is used for making the object light 1 with the attenuated intensity incident onto a reflecting mirror 3, the object light 1 is reflected by the reflecting mirror 3 and then is incident into a spatial filter 2, the spatial filter 2 is used for filtering and expanding the object light 1, the filtered and expanded object light 1 is incident into a Fourier lens 2, and the divergence angle of the object light 1 emitted by the Fourier lens 2 is equal to the angle 1 shown in fig. 3 by adjusting the relative position between the spatial filter 2 and the Fourier lens 2. The object light 1 emitted by the Fourier lens 2 is incident into 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 the extension line of the boundary of the object light 1 reflected on the grating recording material intersects at a point on the right side of the grating recording material, which is equivalent to the focal point F in FIG. 3 ₁ 。

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 the light intensity 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 passing through the photographing process (or may be also referred to as an exposure process) shown in fig. 4, a hologram grating is recorded on the grating recording material, and the photographing process shown in fig. 4 may be also referred to as a hologram exposure.

A holographic grating obtained after the exposure process shown in fig. 4, the holographic grating corresponding to the focal point F shown in fig. 3 ₁ Focal length f ₁ =0.125 m. Assume that: l (L) ₁ When a wearer looks at an object at a position of 40cm using the multifocal spectacles, the multifocal spectacles diffract diffracted light 1, and the diffracted light 1 generates a focus F at 40cm ₁ Corresponding focal length f ₁ =0.125 m, the glasses are 800 degree presbyopic glasses.

In combination with the above example, the reference light 2 and the object light 2 are set as a group, the reference light 2 is set as a divergent light having a divergence angle of 5, the object light 2 is set as a convergent light having a virtual focal length of 33.3cm and a convergence 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 piece of grating recording material, respectively. Fig. 5 is a schematic diagram of an optical path of an example of the reference light 2 and the object light 2 provided in the present application during the shooting process on the grating recording material. The grating recording material shown in fig. 5 is a grating recording material obtained after photographing has been performed in the manner shown in fig. 4.

As shown in fig. 5, laser B is used to generate blue light, laser G is used to generate green light, and laser R is used to generate red light. The red light generated by the laser R is incident on the reflecting mirror 1, reflected by the reflecting mirror 1 and then incident on the dichroic mirror 1, the green light generated by the laser G is also incident on the dichroic mirror 1, the dichroic mirror 1 is used for reflecting the green light and transmitting the red light, and therefore, the light emitted by the dichroic mirror 1 is red light and green light. The dichroic mirror 1 emits red light and green light to be incident into the dichroic mirror 2, and the blue light generated by the laser B is also incident into the dichroic mirror 2, and the dichroic mirror 2 is configured to transmit the blue light and reflect the red light and the green light, so that the light emitted from the dichroic mirror 2 is the blue light, the red light, and the green light, in other words, the dichroic mirror 2 combines the blue light, the red light, and the green light into one light. The light (including blue light, red light, and green light) emitted from the dichroic mirror 2 is incident on 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 reflecting mirror 2, reflected by the reflecting mirror 2 and then incident on the spatial filter 1, the spatial filter 1 filters and expands the reference light 2, and the filtered and expanded reference light 2 is incident on the fourier lens 1, and the divergence angle of the reference light 2 emitted from the fourier lens 1 is made equal to the angle 5 shown in fig. 3 by adjusting the relative positions between the spatial filter 1 and the fourier lens 1. The reference light 2 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 then the transmitted reference light is incident on the grating recording material.

The object light 2 is incident into an attenuation sheet, the light intensity of the object light 2 is attenuated, the attenuation sheet is used for making the object light 2 with the attenuated intensity incident onto the reflecting mirror 3, the object light 2 is reflected by the reflecting mirror 3 and then is incident into the spatial filter 2, the spatial filter 2 is used for filtering and expanding the object light 2, the filtered and expanded object light 2 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 fig. 3 by adjusting the relative position between the spatial filter 2 and the Fourier lens 2. The object light 2 emitted by the Fourier lens 2 is incident into 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 at a point on the left side of the grating recording material, which is equivalent to the virtual focus F in FIG. 3 ₂ 。

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 passing through the photographing process shown in fig. 5, the corresponding focal points of the grating recording material (or may be referred to as a hologram grating) include: focus F shown in fig. 3 ₁ Focal length f ₁ =0.125 m, and virtual focus F shown in fig. 3 ₂ Focal length f ₂ =33.3 cm. Assume that: l (L) ₁ 40cm, L ₂ When the grating recording material is used for manufacturing a multifocal spectacle lens with the length of 5m, a wearer can diffract diffracted light 1 when looking at an object at a position of 40cm when using the multifocal spectacle lens, and the diffracted light 1 can generate a focus F ₁ Corresponding focal length f ₁ =0.125 m, the glasses being 800 degree presbyopic glasses; when a wearer looks at an object at 5m when using the glasses, the multifocal spectacle lens will diffract diffracted light 2, and the diffracted light 2 will generate a focal point F ₂ Corresponding focal length f ₂ =33.3 cm, the glasses are 300-degree presbyopic glasses.

In combination with the above example, the reference light 3 and the object light 3 are set as a group, the reference light 3 is set as parallel light, the object light 3 is set as convergent light with a virtual focal length of 20cm and a convergence angle of 3, and after the reference light 1 and the object light 1, and the reference light 2 and the object light 2 are shot on the same piece of grating recording material, the reference light 3 and the object light 3 are shot 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 shot on the same piece of grating recording material, respectively. Fig. 6 is a schematic diagram of an optical path of an example of the reference light 3 and the object light 3 provided in the present application during the shooting process on the grating recording material. The grating recording material shown in fig. 6 is a grating recording material obtained after photographing has been performed in the manner shown in fig. 5.

As shown in fig. 6, laser B is used to generate blue light, laser G is used to generate green light, and laser R is used to generate red light. The red light generated by the laser R is incident on the reflecting mirror 1, reflected by the reflecting mirror 1 and then incident on the dichroic mirror 1, the green light generated by the laser G is also incident on the dichroic mirror 1, the dichroic mirror 1 is used for reflecting the green light and transmitting the red light, and therefore, the light emitted by the dichroic mirror 1 is red light and green light. The dichroic mirror 1 emits red light and green light to be incident into the dichroic mirror 2, and the blue light generated by the laser B is also incident into the dichroic mirror 2, and the dichroic mirror 2 is configured to transmit the blue light and reflect the red light and the green light, so that the light emitted from the dichroic mirror 2 is the blue light, the red light, and the green light, in other words, the dichroic mirror 2 combines the blue light, the red light, and the green light into one light. The light (including blue light, red light, and green light) emitted from the dichroic mirror 2 is incident on 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.

The reference light 3 is incident on the reflector 2, reflected by the reflector 2 and then incident on the spatial filter 1, the spatial filter 1 filters and expands the reference light 2, the filtered and expanded reference light 2 is incident on the fourier lens 1, and the reference light 3 emitted from the fourier lens 1 is parallel light by adjusting the relative positions between the spatial filter 1 and the fourier lens 1. 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 then the transmitted reference light is incident on the grating recording material.

The object light 3 is incident into an attenuation sheet, the light intensity of the object light 3 is attenuated, the attenuation sheet is used for making the object light 3 with the attenuated intensity incident onto the reflecting mirror 3, the object light 3 is reflected by the reflecting mirror 3 and then is incident into the spatial filter 2, the spatial filter 2 is used for filtering and expanding the object light 3, the filtered and expanded object light 3 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 fig. 3 by adjusting the relative position between the spatial filter 2 and the Fourier lens 2. The object light 3 emitted by the Fourier lens 2 is incident into 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 at a point on the left side of the grating recording material, which is equivalent to the virtual focus F in FIG. 3 ₃ 。

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 passing through the photographing process shown in fig. 6, the focus corresponding to the grating recording material includes: focus F shown in fig. 3 ₁ Focal length f ₁ =0.125 m; virtual focus F shown in FIG. 3 ₂ Focal length f ₂ =33.3 cm, virtual focus F shown in fig. 3 ₃ Focal length f ₃ =20 cm. Assume that: l (L) ₁ 40cm, L ₂ 5m, L ₃ Is an infinite distance. When the grating recording material is used for manufacturing the multifocal spectacle lens, a wearer can diffract diffracted light 1 when looking at an object at a position of 40cm when using the multifocal spectacle lens, and the diffracted light 1 can generate focus F ₁ Corresponding focal length f ₁ =0.125 m, the glasses being 800 degree presbyopic glasses; when a wearer looks at an object at 5m when using the glasses, the multifocal spectacle lens will diffract diffracted light 2, and the diffracted light 2 will generate a focal point F ₂ Corresponding focal length f ₂ =33.3 cm, the glasses are 300 degree presbyopic glasses; when a wearer looks at an object at infinity while using the glasses, the multifocal spectacle lens diffracts diffracted light 3, and the diffracted light 3 generates a focal pointF ₃ Corresponding focal length f ₃ =20cm, the glasses are hyperopic lenses of 500 degrees.

After S130, an HOE having a plurality of optical powers (or may be referred to as focal points) is obtained, and the HOE is an angle-multiplexed HOE, and has multiple focal points.

For example, in conjunction with the above example, the HOE has three different foci, focus F ₁ Virtual focus F ₂ Virtual focus F ₃ Different focal points correspond to different focal lengths.

It will be appreciated that S130 and fig. 4-6 illustrate a process for fabricating an HOE according to the HOE design process described in S110-120.

It should be appreciated that the order of photographing the plurality of sets of light is not limited during photographing the same piece of grating recording material with the plurality of sets of light. The multiple groups of light are only required to be shot on the same grating recording material in sequence, and the embodiment of the application is not limited herein.

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

After S140, a multifocal spectacle lens based on the angle multiplexed HOE is produced.

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

the reference light 1 and the object light 1 are arranged as a group, the reference light 1 is arranged as divergent light with a divergence angle of 4, and the object light 1 is arranged as 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 as a group, the reference light 2 is arranged as divergent light with a divergence angle of 5, the object light 2 is arranged as convergent light with a virtual focal length of 33.3cm and a convergence angle of 2;

the reference light 3 and the object light 3 are set as a group, 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 ophthalmic lens has three different focal lengths or diopters corresponding to 800 degrees of distance vision, 300 degrees of near vision and 500 degrees of near vision, respectively.

The method for manufacturing the multifocal spectacle lenses provided by the embodiment of the application is based on the angle multiplexing grating element technology. Shooting the same piece of 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 light of different groups corresponds to different preset viewing distances, the object light of different groups corresponds to the myopia degree or the hyperopia degree of a user, the object light of different groups corresponds to different preset focuses, each group of object light and the reference light corresponds to a preset focus, and focuses corresponding to multiple groups of light 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 amplitude during far vision and myopia switching is not easy to be caused, 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 made using a method of making a multifocal ophthalmic lens provided by any of the embodiments of the present application, the multifocal ophthalmic lens having a plurality of different focal lengths (diopters).

The embodiment of the application also provides the multifocal spectacles, which comprise any of the multifocal spectacle lenses provided by the embodiment of the application.

The multifocal spectacles provided by the embodiment of the application comprise a multifocal lens manufactured by an angle multiplexing-based grating element technology, and the controllable step change of diopter of the lens is realized, so that the problems that diopter change amplitude of the multifocal spectacles is large and FOV of eyes of people are limited due to the mode of dividing the lens 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 the switching use among different application conditions such as far vision, middle vision and myopia, and visual fatigue caused by overlarge diopter change amplitude during far vision and myopia switching is also less likely to be caused, the eyes are better protected, and the use efficiency and user experience of the multifocal spectacles are improved.

For example, in combination with the above examples, in the actual use of the multifocal spectacles by the user, according to the characteristics of the diffractive optics, if the multifocal spectacles are given reference light 1, reference light 2, and reference light 3 (i.e., when the user views different objects, the light reflected by the different objects to the multifocal spectacles is reference light 1, reference light 2, and reference light 3), the HOE diffracts diffracted light 1, diffracted light 2, and diffracted light 3 that are completely consistent with the design process. The diffracted light 1 will generate a focal point F ₁ Corresponding focal length f ₁ =0.125 m; the diffracted light 2 will produce a virtual focus F ₂ Corresponding focal length f ₂ =33.3 cm; the diffracted light 3 will produce a virtual focus F ₃ Corresponding focal length f ₃ ＝20cm。

For example as shown in fig. 7:

when a user wears the multifocal spectacles to watch an object with the same viewing distance as a preset distance L1 (for example, 40 cm), after the light reflected by the object (with the same divergence angle as that of the reference light 1) is diffracted by the spectacle lenses of the multifocal spectacles, the actual diffracted light is consistent with the diffracted light 1 when designed, and the corresponding diopter D1 (for example, D1=8) or power (800-degree hyperopia) is provided;

when a user wears an object with the same viewing distance as a preset distance L2 (for example, 5 m), after light reflected by the object (with the same divergence angle as that of the reference light 2) is diffracted by the lens of the multifocal glasses, the actual diffracted light is consistent with the diffracted light 2 when designed, and has corresponding diopter D2 (for example, d2= -3) or power (300-degree myopic glasses);

When a user wears the multi-focus glasses to watch an object with the same viewing distance as a preset distance L3 (such as infinity), after light reflected by the object (parallel light and the same divergence angle of reference light 3) are diffracted by the glasses lens of the multi-focus glasses, the actual diffracted light is consistent with the diffracted light 3 when designed, and the multi-focus glasses have corresponding diopter D3 (such as D2= -5) or degree (500-degree myopic glasses);

in other words, the function of multifocal is achieved by using multifocal spectacles made of the grating 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 described as an example, and in other embodiments of the present application, more sets of object light and reference light may be used to capture and record a grating on the same piece of grating recording material. For example, assume that the presbyopia and presbyopia powers of a preset vision correcting 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 can be respectively set, object light respectively corresponding to each degree of myopia and each degree of hyperopia can be respectively set, and the object light is equivalent to the existence of focal distances corresponding to each degree of myopia, so that the variation amplitude between different focal distances can be reduced. In this case, the number of different viewing distances of the preset user may be set to be the same as the number of the object lights, or may be larger than the number of the object lights, so that the object lights and the reference lights of more groups are respectively shot on the same grating recording material, the grating is recorded, the grating element with more focal lengths is manufactured, and the multi-focus glasses are manufactured by using the grating element, and will have more different focal lengths or diopters.

It will also be appreciated that if the distance vision and near vision power of the wearer of the multifocal spectacles are single, i.e. when looking at objects of different distances, there is only one distance vision power and one near vision power, in which case the focal length (or diopter) of the multiplexed near vision mirror may be set to f ₁ ＝f ₂ ＝……＝f _n Setting the multiplexed distance view focal length to f ₁ ’＝f ₂ ’＝……＝f _n ' i.e. the user uses the multifocal spectacles to see objects in different positions, the spectacles have only two focal lengths (or may also be referred to as diopters or foci): near vision mirror f ₁ And presbyopic glasses f ₁ '. In this case, the number of object lights is two (one corresponding to far vision degree and one corresponding to near vision degree), and the number of preset different viewing distances of the user can be more than two, and multiple groups of lights are used for recording in the same gratingWhen shooting is performed on a material, the number of the plurality of groups of light (each group of light comprises one object light and one reference light) and the number of the viewing distances are the same, and in the plurality of groups of light, a plurality of groups of light with the same corresponding focal point or diopter exist (namely, the object light in the plurality of groups of light is the same).

It should be further understood that in the embodiment of the present application, when n reference lights and n object lights may be optionally combined and then photographed on the same optical grating recording material, only one object light is required to correspond to one reference light.

For example, in the above example, the object light 1 may be set to a group with the reference light 2, or the object light 1 may be set to a group with the reference light 3;

alternatively, the object light 2 may be set together with the reference light 1, or the object light 2 may be set together with the reference light 3;

alternatively, the object light 3 may be combined with the reference light 1 and set together, or the object light 3 may be combined with the reference light 2 and set together.

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 corresponding to the user, in which case, 3 reference lights and 2 object lights may be combined at will and then photographed on the same raster recording material, or 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 a group, the object light 1 and the reference light 2 are set as a group, and the object light 2 and the reference light 3 are set as a group. In this case, three sets of light correspond to two focal points, wherein the focal points corresponding to the two sets of light including the object light 1 are the same, and after photographing with the same piece of grating recording material using the three sets of light, the resulting grating element has two different focal points.

It should be further understood that in the above embodiment, in the process of photographing on the same grating recording material, only three wavelengths of RGB are used as each group of reference light and object light, so that the grating element made of the grating recording material does not form color difference in the use process, and the wavelength is used for multiplexing, so that the use effect is better. It should be understood that in other embodiments of the present application, the light source used to generate the reference light and the object light may also be other types or forms of light sources, and the present application is not limited herein.

It should also be understood that in the embodiment of the present application, the grouping multiplexing is performed on a plurality of different reference lights according to different distances when a preset user views different objects, which may be the case that the grouping is not fine enough in the shooting process, and the objects viewed by the multifocal glasses are just between two preset distances when the user uses the multifocal glasses, so that the diopters (or degrees) in the focal glasses are inconsistent with the preset. For example: let L corresponding to reference light 1 ₁ (distance from the object when the object is viewed by the preset glasses) is set to 20cm, L corresponding to the reference light 2 ₂ Set to 40cm (preset distance from the object when viewing the object with the glasses), and the user views the object at a distance of 30cm with the multifocal glasses in actual use, at which time the diopter of the multifocal glasses is neither the same as L ₁ Focal length f corresponding to object light 1 of the same group ₁ Nor with L ₂ Focal length f corresponding to object light 2 of the same group ₂ . The reason for this is that the preset use distance is finely subdivided. According to the multiplexing theory, the multiplexing times are not limited to specific times, so in other embodiments of the application, the distance between the preset object to be watched and the preset object to be watched can be divided more finely according to the distance range and the fineness requirement of the preset object to be watched in use, so that the distance between the preset object to be watched and the preset object to be watched in actual use is included. For example, the distance from the object when the object is viewed is preset as follows: 20cm, 30cm, 40cm, etc., so that a user views an object at a distance of 30cm using the multifocal spectacles when in actual use, the diopter of the multifocal spectacles is a diopter corresponding to a preset 30 cm.

In addition, when the distance from the object is thinned to a sufficient extent when the object is viewed in advance, in a case where the actual distance L from the object is not the same as the predetermined distance, for example: preset L ₁ ＝20cm，L ₂ 22cm, while the object actually viewed by the user is located at 21cmThe change of the focal point F or the focal length F of the multifocal spectacles and the tiny change thereof are caused, the change of the degree can be far less than 50 degrees, and even if the diopter adjustment capability is abnormal (such as myopia or hyperopia), the eyes of the people are provided with diopter self-adapting ranges (generally more than or equal to 50 degrees), so that the change of the focal point F or the focal length F caused at the moment is completely in the self-adapting range of human eyes (including people with the diopter adjustment capability), and the realization and the use of the functions of the multifocal spectacles are not influenced.

It should be understood that the foregoing is only intended to assist those skilled in the art in better understanding the embodiments of the present application and is not intended to limit the scope of the embodiments of the present application. It will be apparent to those skilled in the art from the foregoing examples that various equivalent modifications or variations can be made, for example, in which some steps of the methods described above are not required, or in which some steps are newly added, etc. Or a combination of any two or more of the above. Such modifications, variations, or combinations are also within the scope of embodiments of the present application.

It should also be understood that the various numbers referred to in the embodiments of the present application are merely descriptive convenience and are not intended to limit the scope of the embodiments of the present application. The sequence numbers of the above-mentioned processes do not mean the sequence of execution sequence, and the execution sequence of each process should be determined by its functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

It is also to be understood that in the various embodiments of the application, terms and/or descriptions of the various embodiments are consistent and may be referenced to one another in the absence of a particular explanation or logic conflict, and that the features of the various embodiments may be combined to form new embodiments in accordance with their inherent logic relationships.

It will be clear to those skilled in the art that, for convenience and brevity of description, the specific working procedures of the systems, apparatuses and units described above may refer to the corresponding procedures in the foregoing embodiments, and are not repeated here.

The foregoing is merely 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 think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to 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 (9)

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

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

manufacturing a multifocal spectacle lens by utilizing the grating element;

each of the N groups of light comprises object light and reference light, the object light in each group of light corresponds to the myopia degree or the hyperopia degree of a user, the reference light in different groups of light corresponds to different preset viewing distances, each group of light corresponds to one focus, the N groups of light corresponds 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 infinity, M is an integer larger than or equal to 2, and the multifocal spectacle lens has M different focuses.

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

according to the myopia degree and the hyperopia degree of the user, M object lights are determined, and the sum 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 the N groups of lights.

3. The method of claim 2, wherein when N and M are equal, the object light in any two groups of light is different, the different object light corresponds to a user with different near vision or far vision, and the focus corresponding to the different group of light is different; or,

when N and M are not equal, the focuses of the multiple groups of light corresponding to the same object light are the same, and the myopia degree or hyperopia degree of the user corresponding to the same object light is the same.

4. A method according to claim 2 or 3, wherein said determining M object lights from the user's near vision power and far vision power comprises:

determining a focus and a focal length corresponding to each myopia degree and hyperopia degree respectively according to the myopia degree and the hyperopia degree of the user;

according to the focuses corresponding to each near-sighted degree and far-sighted degree respectively, determining the diffraction light divergence angle or convergence angle corresponding to each focus;

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

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

5. The method of claim 4, wherein the photographing with N sets of light on the same piece of grating recording material comprises:

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

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

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 convergence angle of the first reference light incident into the second beam splitter is the same as the divergence angle or convergence angle of the first reference light, and the second beam splitter is used for transmitting the first reference light from the first Fourier lens to the grating recording material;

The second reflector is used for making the first object light incident into a second spatial filter, the second spatial filter is used for making the first object light incident into a second Fourier lens, the second Fourier lens is used for making the first object light incident into a second beam splitter, the divergence angle or convergence angle of the first object light incident into the second beam splitter is the same as the divergence angle or convergence angle of the first object light, and the second beam splitter is used for reflecting the first object light from the second Fourier lens onto the grating recording material.

6. The method of claim 5, wherein the laser light source comprises: a red laser source, a blue laser source, a green laser source, the first light beam comprising: the red light laser light source will produce red light, the green light laser light source will produce green light, and the blue light laser light source will produce blue light, the method further comprising:

the red laser light source emits the generated red light into a third reflecting mirror, the third reflecting mirror 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. A method according to any one of claims 1 to 3, wherein the grating element comprises: any one of HOE, DOE, surface relief grating, super surface grating structure.

8. A multifocal spectacle lens, characterized in that it is produced by means of a method for producing a multifocal spectacle lens according to any one of claims 1 to 7, said multifocal spectacle lens having M distinct focal points, M being an integer greater than or equal to 2.

9. A multifocal ophthalmic lens comprising the multifocal ophthalmic lens of claim 8, said multifocal ophthalmic lens having M distinct foci, M being an integer greater than or equal to 2.