WO2022070600A1

WO2022070600A1 - Transmissive diffractive optical element, bonding optical element, intraocular lens, contact lens, and method for manufacturing transmissive diffractive optical element

Info

Publication number: WO2022070600A1
Application number: PCT/JP2021/028838
Authority: WO
Inventors: 耕基中林
Original assignee: 富士フイルム株式会社
Priority date: 2020-09-30
Filing date: 2021-08-03
Publication date: 2022-04-07
Also published as: JP7408831B2; JPWO2022070600A1

Abstract

This transmissive diffractive optical element comprises a layer in which a refractive index distribution due to a concentration ratio among at least two materials is formed, wherein the refractive index distribution is a blazed-type distribution from the center of the transmissive diffractive optical element toward the outside.

Description

Method for manufacturing transmission type diffractive optical element, junction optical element, intraocular lens, contact lens, and transmission type diffractive optical element

The technique of the present disclosure relates to a transmission type diffractive optical element, a junction optical element, an intraocular lens, a contact lens, and a method for manufacturing a transmission type diffractive optical element.

Japanese Unexamined Patent Publication No. 2011-107586 discloses a diffractive optical element in which a plurality of diffraction gratings made of at least three types of materials are laminated. In the diffractive optical element described in JP-A-2011-107586, the plurality of diffraction gratings are made of materials M1A and M1B different from each other, and the lattice side edges of the grating portions are in contact with each other or arranged close to each other in the lattice pitch direction2. A first combination portion consisting of one diffraction grating and a second one consisting of two diffraction gratings made of materials M2A and M2B different from each other, unlike the material of the two diffraction gratings whose material is at least one of the first combination parts. It has a combination part. Then, the d-line of the materials M1A and M1B forming the first combination portion, the refractive indexes N1Aw and N1Bw at a certain wavelength w (nm), the Abbe numbers ν1A and ν1B, and the materials M2A and M2B forming the second combination portion. The values of the refractive indexes N2Ad and N2Bd, and the Abbe numbers ν2A and ν2B are appropriately set.

Japanese Patent Application Laid-Open No. 2009-530689 discloses a method for producing a wavefront avelator with increased stability against exposure to heat and / or sunlight.

The method for manufacturing the wavefront avelator described in JP-T-2009-530689 is described in a. A step of forming a layer of a polymerizable material with at least one polymer and one or more monomers between the two transparent plates, wherein the polymerizable material has an initial index of refraction, b. The polymerizable material is simultaneously subjected to thermal stimulation and variable photostimulation, and the polymerizable material is subjected to (i) variable pattern polymerization without completely consuming one or more monomers. (Ii) A step of achieving a first intermediate variable index profile, and c. By heating the partially cured polymerizable material of (b), the diffusion step is promoted, and the uncured monomer is diffused from the region where the curing is less to the region where the curing is more advanced, and the second intermediate. Steps to achieve a variable index of refraction profile and d. The partially cured polymerizable material of (c) is simultaneously subjected to thermal stimulation and uniform photostimulation to cure substantially all of the remaining one or more monomers, resulting in a variable refractive index. The steps to achieve the profile include, thereby making the wave surface aberator stable to thermal and / or sunlight conditions.

One embodiment according to the technique of the present disclosure is to suppress ghosts caused by incident light as compared with a transmission type diffractive optical element that diffracts light by utilizing a blazed physical surface structure. Provided are a method for manufacturing a transmission type diffractive optical element, a junction optical element, an intraocular lens, a contact lens, and a transmission type diffractive optical element.

The first aspect according to the technique of the present disclosure is a transmission type diffraction optical element, comprising a layer in which a refractive index distribution is formed by a concentration ratio of at least two materials, and the refractive index distribution is a transmission type diffraction optical element. It is a transmission type diffractive optical element having a blazed distribution from the center to the outside.

The second aspect according to the technique of the present disclosure is the transmission type diffractive optical element according to the first aspect, wherein the refractive index of one of the two materials is higher than the refractive index of the other material.

The third aspect according to the technique of the present disclosure is the transmission type diffractive optical element according to the second aspect, in which the wavelength dispersion of one material is lower than the wavelength dispersion of the other material.

A fourth aspect according to the technique of the present disclosure is two types of cured resins in which two materials are cured by reacting with energy given from the outside, and the two types of cured resins have a reaction rate to energy. It is a transmission type diffractive optical element according to any one of the first aspect to the third aspect, which is a cured resin different from each other.

A fifth aspect according to the technique of the present disclosure is a permeation according to a fourth aspect comprising a first inorganic nanoparticles in which at least two materials react with one of the cured resins of the two types of cured resin. It is a type diffractive optical element.

A sixth aspect according to the technique of the present disclosure is the transmission diffractive optical element according to the fifth aspect, wherein the first inorganic nanoparticles are nanoparticles having the same reactive group as one of the cured resins surface-modified. be.

A seventh aspect according to the technique of the present disclosure is a fifth aspect or a sixth aspect comprising a second inorganic nanoparticles in which at least two materials react with the other cured resin of the two cured resins. The transmission type diffractive optical element according to the above embodiment.

Eighth aspect according to the technique of the present disclosure is the transmission type diffractive optical element according to the seventh aspect, wherein the second inorganic nanoparticles are nanoparticles having the same reactive group as the other cured resin surface-modified. be.

In the ninth aspect according to the technique of the present disclosure, the blaze-type refractive index distribution has a first refractive index change range in which the refractive index changes at the first rate of change and a second aspect in which the refractive index is larger than the first rate of change. The transmissive diffractive optical element according to any one of the first to eighth aspects, which is a distribution in which the second refractive index change range in which the refractive index changes according to the rate of change is alternately connected.

The tenth aspect according to the technique of the present disclosure is the transmission type diffractive optical element according to the ninth aspect in which the second rate of change is the rate of change in the direction opposite to the first rate of change.

The eleventh aspect according to the technique of the present disclosure is the transmission according to the ninth aspect or the tenth aspect in which the refractive index of the second refractive index change range changes at the second rate of change from the center to the outside. It is a type diffractive optical element.

In the twelfth aspect of the technique of the present disclosure, the blaze-type refractive index distribution has a first refractive index change range in which the refractive index changes at the first rate of change and a second aspect in which the refractive index is larger than the first rate of change. It is a distribution in which the second refractive index change range in which the refractive index changes according to the rate of change is alternately connected. In the refractive index distribution, the minimum refractive index is Na, the maximum refractive index is Nb, and the second refractive index. From the first aspect to the eleventh aspect, when the change width of the change range is t and the layer thickness is h, the inequality of h <t · tan θc and the equation of θc = asin (Na / Nb) are established. A transmissive diffractive optical element according to any one of the embodiments.

A thirteenth aspect according to the technique of the present disclosure is a transmissive diffractive optical element according to any one of the first to twelfth aspects, wherein the layer is formed in a film shape by at least two materials. be.

A fourteenth aspect according to the technique of the present disclosure comprises a transmission type diffractive optical element according to any one of the first to thirteenth aspects, and at least one optical element, and comprises transmission type diffractive optics. The element is a bonded optical element that is bonded to at least one optical element.

A fifteenth aspect according to the technique of the present disclosure is an intraocular lens embedded in an eye, the transmissive diffractive optical element according to any one of the first to thirteenth aspects, and a first aspect. An intraocular lens comprising a lens and a second lens, wherein the transmissive diffractive optical element is a junction layer between the first lens and the second lens.

A sixteenth aspect according to the technique of the present disclosure is a contact lens that comes into contact with the cornea and includes a transmission type diffractive optical element according to any one of the first to thirteenth aspects. ..

A seventeenth aspect according to the technique of the present disclosure is a transmissive diffractive optical element, comprising a layer in which a refractive index distribution is formed according to a concentration ratio of at least two materials, and the refractive index distribution has a first rate of change. It is a distribution in which the first refractive index change range in which the refractive index changes and the second refractive index change range in which the refractive index changes at a second change rate larger than the first change rate are alternately connected. , A transmissive diffractive optical element.

An eighteenth aspect according to the technique of the present disclosure is to apply a solution having at least two materials to a predetermined surface, and to cure the at least two materials to obtain a refractive index distribution based on the concentration ratio of the at least two materials. A method for manufacturing a transmission type diffraction optical element, which comprises forming a layer formed in a blazed shape.

A nineteenth aspect according to the technique of the present disclosure is two types of cured resins in which two materials are cured by reacting with energy given from the outside, and the two types of cured resins have a reaction rate to energy. It is a method for manufacturing a transmission type diffractive optical element according to an eighteenth aspect, which comprises applying energy to at least two materials with an energy distribution corresponding to the shape of a refractive index distribution, which are cured resins different from each other.

A twentieth aspect according to the technique of the present disclosure is a transmission type diffraction according to the nineteenth aspect, wherein the energy distribution is a distribution obtained by deforming a blazed reference energy distribution according to the distribution of concentrations of at least two materials. This is a method for manufacturing an optical element.

A twenty-first aspect according to the technique of the present disclosure is a method for manufacturing a transmission type diffractive optical element according to a nineteenth aspect or a twentieth aspect, which comprises applying energy to at least two materials while changing an energy distribution. Is.

A 22nd aspect according to the technique of the present disclosure is a 19th aspect comprising applying energy to at least two materials in an energy distribution and then applying energy to at least two materials in a uniform distribution. It is a method of manufacturing a transmission type diffractive optical element according to any one aspect of the 21st aspect.

A 23rd aspect according to the technique of the present disclosure includes applying energy to at least two materials in an energy distribution and then applying energy to at least two materials in a distribution opposite to the energy distribution. It is a method for manufacturing a transmission type diffractive optical element according to any one of 19th to 21st aspects.

In the twenty-fourth aspect of the technique of the present disclosure, the blaze-type refractive index distribution has a first refractive index change range in which the refractive index changes at the first rate of change and a second range in which the refractive index changes larger than the first rate of change. It is a distribution in which the second refractive index change range in which the refractive index changes according to the rate of change is alternately connected. In the refractive index distribution, the minimum refractive index is Na, the maximum refractive index is Nb, and the second refractive index. A first including the generation of a layer in which the inequality of h <t · tan θc and the equation of θc = asin (Na / Nb) are satisfied when the change width of the change range is t and the thickness of the layer is h. It is a method of manufacturing a transmission type refraction optical element which concerns on any one of 18th to 23rd aspects.

It is a schematic block diagram which shows an example of the appearance of the manufacturing apparatus which manufactures a junction optical element. It is a schematic perspective view which shows an example of the appearance of a plano-concave lens. It is a schematic perspective view which shows an example of the appearance of a plano-convex lens. It is a conceptual diagram which shows an example of the structure of the conventional laminated blazed diffraction optical element. It is a conceptual diagram which shows the mode example of the scattering which occurs when the subject light is incident on the conventional laminated blazed diffraction optical element. It is a conceptual diagram which shows the mode example of the ghost by the refraction which occurs when the subject light is incident on the conventional laminated blazed diffraction optical element. It is a conceptual diagram which shows the mode example of the ghost by the total reflection generated when the subject light is incident on the conventional laminated blazed diffraction optical element. It is a flowchart which shows an example of the procedure of the manufacturing method of a junction optical element. It is a flowchart which shows an example of the content of the filling process included in the procedure of the manufacturing method of a junction optical element. A schematic cross section showing an example of the cross-sectional structure of a junction optical element when the adhesive filled between the plano-concave lens and the plano-convex lens transitions to a state before curing, a gelled state, and a completely cured state in order. It is a figure. It is a conceptual diagram which shows an example of an embodiment in which the same reactive group as a polymer is surface-modified to inorganic nanoparticles. It is explanatory drawing used for the explanation of the composition ratio of the polymer (for example, a polymer) produced by the copolymerization reaction when two kinds of monomers are mixed. 6 is a copolymer composition curve showing an example of the correlation between the concentration of the monomer before curing and the composition ratio of the monomer in the polymer when the copolymerization reaction by two kinds of monomers is carried out. It is a block diagram which shows an example of the structure of a manufacturing apparatus main body. It is a block diagram which shows an example of the structure of a control device. It is a block diagram which mainly shows an example of the function of the CPU of a control device. It is a conceptual diagram which shows an example of the structure of a setting screen. It is a conceptual diagram which shows an example of the junction optical element and the refractive index distribution information. It is a conceptual diagram which shows an example of the structure of an irradiation profile. It is a conceptual diagram which shows an example of the correspondence relation between the illuminance distribution and the refractive index distribution. It is a conceptual diagram which shows an example of the aspect of the transmitted wavefront of a junction optical element. It is a schematic cross-sectional view which shows an example of the cross-sectional structure of a junction optical element. It is a schematic cross-sectional view which shows an example of the cross-sectional structure of a junction optical element. It is a conceptual diagram which shows the modification of the illuminance distribution used in this curing process. It is a conceptual diagram which shows the modification of the illuminance distribution used in the density distribution formation process. It is a conceptual diagram which shows an example of the structure of an intraocular lens. It is a conceptual diagram which shows an example of the structure of a contact lens.

Hereinafter, an example of an embodiment of a method for manufacturing a transmission type diffractive optical element, a junction optical element, an intraocular lens, a contact lens, and a transmission type diffractive optical element according to the technique of the present disclosure will be described with reference to the attached drawings.

In the description of the present specification, "vertical" is an error generally allowed in the technical field to which the technology of the present disclosure belongs, in addition to the perfect verticality, which is contrary to the purpose of the technology of the present disclosure. It refers to the vertical in the sense that it includes an error that does not occur. Further, in the description of the present specification, "orthogonal" is an error generally allowed in the technical field to which the technique of the present disclosure belongs, in addition to the perfect orthogonality, which is contrary to the purpose of the technique of the present disclosure. It refers to orthogonality in the sense that it includes an error that does not occur. Further, in the description of the present specification, "parallel" is an error generally allowed in the technical field to which the technology of the present disclosure belongs, in addition to the perfect parallelism, which is contrary to the purpose of the technology of the present disclosure. It refers to parallelism in the sense that it includes an error that does not occur. Further, in the description of the present specification, "identical" is an error generally allowed in the technical field to which the technology of the present disclosure belongs, in addition to being completely the same, which is contrary to the purpose of the technology of the present disclosure. It refers to the same in the sense that it includes an error to the extent that it does not occur.

As an example, as shown in FIG. 1, the manufacturing apparatus 2 is an apparatus for manufacturing a junction optical element 10, and includes a manufacturing apparatus main body (hereinafter, also simply referred to as “main body”) 11 and a control device 12. The control device 12 is communicably connected to the main body 11. The control device 12 is, for example, a personal computer (in the example shown in FIG. 1, a desktop personal computer), and controls the operation of the main body 11.

The junction optical element 10 is used, for example, as a lens of an optical device (for example, a digital camera, a projector, a microscope, etc.) and a lens of a vision correction tool (for example, a lens of eyeglasses and an intraocular lens). The junction optical element 10 includes a pair of lenses. The pair of lenses included in the junction optical element 10 is a glass lens and transmits ultraviolet UV rays (see FIGS. 10 and 14). In the example shown in FIG. 1, a plano-concave lens 13 (see also FIG. 2) and a plano-convex lens 14 (see also FIG. 3) are shown as a pair of lenses. The plano-concave lens 13 and the plano-convex lens 14 are examples of "at least one optical element" according to the technique of the present disclosure.

Here, a combination of a plano-concave lens 13 and a plano-convex lens 14 is illustrated as a pair of lenses, but this is only an example, and the pair of lenses is a combination of other types of lenses (for example, a plano-convex lens). It may be a combination with a biconcave lens, a combination of a biconvex lens and a plano-concave lens, etc.). Further, the pair of lenses does not have to be made of glass, and may be made of resin. Further, although a pair of lenses is illustrated here, the technique of the present disclosure is not limited to this, and only one lens may be used. Further, instead of the lens or together with the lens, an optical element such as a transparent substrate and / or a mirror may be applied.

In the following, for convenience of explanation, the thickness direction of the plano-concave lens 13 and the plano-convex lens 14 is the Z direction, the width direction of the plano-concave lens 13 and the plano-convex lens 14 is the X direction, and the depth in the figure of the plano-concave lens 13 and the plano-convex lens 14. The direction, that is, the direction orthogonal to the Z direction and the X direction will be described as the Y direction.

The bonding optical element 10 includes a bonding layer 15. The bonding layer 15 is an example of a "transmission type diffractive optical element" and a "layer" according to the technique of the present disclosure. The bonding layer 15 is interposed between the concave surface 13A of the plano-concave lens 13 and the convex surface 14A of the plano-convex lens 14, and the concave surface 13A and the convex surface 14A are bonded via the bonding layer 15. The bonding layer 15 is formed in a film shape between the concave surface 13A and the convex surface 14A.

Although a detailed configuration example will be described later, the bonding layer 15 is a transmission type diffraction optical element that exhibits maximum diffraction efficiency at a specific diffraction order (for example, +1st order light). That is, the bonding layer 15 has a function of minimizing the amount of light to be contained in a specific diffraction order and the amount of light to be lost to other diffraction orders (for example, 0th-order light and -1st-order light, etc.). It is a layer to have.

As an example, as shown in FIG. 2, the concave surface 13A of the plano-concave lens 13 has a spherical shape before being joined by the joining layer 15. Similarly, as shown in FIG. 3 as an example, the convex surface 14A of the plano-convex lens 14 has a spherical shape before being joined by the joining layer 15. The plano-concave lens 13 and the plano-convex lens 14 transmit ultraviolet UV (see FIGS. 10 and 14) given from the outside. Ultraviolet UV is an example of "energy" according to the technique of the present disclosure.

Here, a conventionally known junction optical element 500 will be described with reference to FIGS. 4 to 7. In the examples shown in FIGS. 4 to 7, it is assumed that the junction optical element 500 is used in the image pickup optical system of a digital camera.

As an example, as shown in FIG. 4, the junction optical element 500 includes a plano-convex lens 502 having a convex surface on the subject side, a plano-concave lens 504 having a concave surface on the image sensor side, and a laminated blazed diffraction grating element 506. The laminated blazed diffraction optical element 506 is a known laminated blazed diffraction optical element. The laminated blazed diffraction grating 506 is interposed between the plano-convex lens 502 and the plano-concave lens 504, and joins the plano-convex lens 502 and the plano-concave lens 504. The subject light indicating the subject is incident on the junction optical element 500 from the convex side of the plano-convex lens 502, and is emitted from the concave surface of the plano-concave lens 504.

As an example, as shown in FIG. 5, the laminated blazed diffraction grating 506 is formed by a pair of blazed members. In the example shown in FIG. 5, a first blazed member 508 and a second blazed member 510 are shown as a pair of blazed members.

The first blazed member 508 has a first serrated surface 512. The first blazed member 508 has a first reference plane 508A. The first reference plane 508A is a virtually set plane, for example, a plane parallel to the convex plane of the plano-convex lens 502 (see FIG. 4).

The first serrated surface 512 is formed by the first steep slope 512A and the first gentle slope 512B. The first gentle slope 512B is a surface having a gentler slope with respect to the first reference surface 508A than the first steep slope 512A. The first steep slope 512A is a plane perpendicular to the first reference plane 508A, and the height of the first steep slope 512A from the first reference plane 508A is the lattice height of the first blazed member 508. The first steep slope 512A does not have to be perpendicular to the first reference surface 512A. This is because, in the optical system used, the angle of the first steep slope 512A is appropriately determined so as to have the highest diffraction efficiency with respect to the direction of the main incident light beam.

The second blazed member 510 has a second serrated surface 514. The second blazed member 514 has a second reference plane 510A. The second reference surface 510A is a virtually set surface, for example, a surface parallel to the concave surface of the plano-concave lens 504 (see FIG. 4).

The second serrated surface 514 is formed by the second steep slope 514A and the second gentle slope 514B. The second gentle slope 514B is a surface having a gentler slope with respect to the second reference surface 510A than the second steep slope 514A. The second steep slope 514A is a plane perpendicular to the second reference plane 510A, and the height of the second steep slope 514A from the second reference plane 510A is the lattice height of the second blazed member 510.

The first serrated surface 512 of the first blazed member 508 is directly engaged with the second serrated surface 514 of the second blazed member 510. In this case, the first steep slope 512A is in direct contact with the second steep slope 514A, and the first gentle slope 512B is in direct contact with the second gentle slope 514B.

In the examples shown in FIGS. 5 to 7, when it is not necessary to distinguish between the first steep slope 512A and the second steep slope 514A for convenience of explanation, they are referred to as “steep slopes” without reference numerals and are referred to as the first steep slope. When it is not necessary to distinguish between the gentle slope 512B and the second gentle slope 514B, it is referred to as "gentle slope" without a reference numeral.

The refractive index of the first blazed member 508 is higher than the refractive index of the second blazed member 510, and in the examples shown in FIGS. 5 to 7, "1.58" is shown as the refractive index of the first blazed member 508. The refractive index of the second blazed member 510 is shown as "1.56".

In the example shown in FIG. 5, a mode in which processing marks remain on the steep slope of the laminated blazed diffraction optical element 506 is shown. In this case, from the first blaze member 508 side, that is, the layer side with a high refractive index (for example, refractive index = 1.58) to the second blaze member 510 side, that is, the low refractive index (for example, refractive index = 1.). When the subject light is applied to the layer side of 56), scattered light is generated on a steep slope due to the processing marks. That is, the subject light transmitted through the laminated blazed diffraction optical element 506 includes scattered light. The subject light including the scattered light is imaged on the image sensor of the digital camera, and the scattered surface is reflected in the captured image obtained by capturing the subject light by the image sensor.

Further, in the laminated blazed grating element 506, as shown in FIG. 6 as an example, the subject light is transmitted from the first blazed member 508 (a layer having a refractive index of “1.58”) to the second blazed member via a gentle slope. It is incident on 510 (a layer having a refractive index of "1.56"), again incident on the first blazed member 508 via the steep slope, and then incident on the second blazed member 510 via the gentle slope. Here, the subject light is refracted on the steep slope depending on the angle θ1 at which the subject light is incident on the steep slope. In the example shown in FIG. 6, the angle θ1 at which the subject light is incident on the steep slope is 5 degrees, and the angle θ2 at which the subject light is refracted on the steep slope is 7 degrees. As a result, the ghost due to the refraction of the subject light is reflected in the captured image obtained by capturing the subject light by the image sensor.

In the example shown in FIG. 6, the subject light transmitted from the first blazed member 508 through the gentle slope is incident on the steep slope, but in the example shown in FIG. 7, the subject light incident on the first blazed member 508 is incident on the gentle slope. The steep slope is directly irradiated without going through. In this case, depending on the angle θ1, the subject light is totally reflected on the steep slope. For example, when the angle θ1 is in the range of 0 degrees or more and 11 degrees or less, the subject light is totally reflected on a steep slope. As a result, the ghost due to the total reflection of the subject light is reflected in the captured image obtained by capturing the subject light by the image sensor.

In view of such circumstances, in the present embodiment, the manufacturing apparatus 2 (see FIG. 1) manufactures the junction optical element 10 (see FIG. 1). FIG. 8 shows an example of a procedure for manufacturing the junction optical element 10 by the manufacturing apparatus 2.

In the example shown in FIG. 8, first, in step ST100, the manufacturing apparatus 2 fills a liquid adhesive 20 (see FIG. 10) between the plano-concave lens 13 and the plano-convex lens 14. As will be described in detail later, the liquid adhesive 20 is a solution in which two types of adhesives (first adhesive 20A and second adhesive 20B described later) are mixed.

The adhesive 20 is an ultraviolet curable resin and is cured by being irradiated with ultraviolet UV (see FIG. 10). Therefore, when the filling step of step ST100 is completed, in the next step ST200, the manufacturing apparatus 2 is charged with two kinds of adhesives in a liquid state between the plano-concave lens 13 and the plano-convex lens 14 in step ST100 (described later). It forms a concentration distribution of the first adhesive 20A and the second adhesive 20B) (for example, substantially the concentration distribution of the first monomer 23A and the second monomer 23B described later). In order to realize the formation of the concentration distributions of the two types of adhesives, the manufacturing apparatus 2 has an illuminance distribution 112 (FIG. 2) described later with respect to the adhesive 20 filled between the plano-concave lens 13 and the plano-convex lens 14. By irradiating with ultraviolet UV according to 19 and FIG. 20), the adhesive 20 is started to be cured, and the concentration distribution forming step is started (see FIG. 10).

Then, in step ST300, the manufacturing apparatus 2 further cures the adhesive 20 by irradiating the adhesive 20 for which the concentration distribution forming step has been completed with ultraviolet UV rays according to the illuminance distribution 113 (see FIG. 19) described later. To make it solid (see FIG. 10). This produces a layer in which the refractive index distribution is blazed (see FIGS. 18 and 20).

As an example, as shown in FIG. 9, in the filling step of step ST100, first, in step ST110, the manufacturing apparatus 2 cleans up the concave surface 13A of the plano-concave lens 13 and the convex surface 14A of the plano-convex lens 14. In the next step ST120, the manufacturing apparatus 2 applies the adhesive 20 in a liquid state to the concave surface 13A (an example of the “default surface” according to the technique of the present disclosure). In the next step ST130, the manufacturing apparatus 2 attaches the concave surface 13A and the convex surface 14A. In the next step ST140, the manufacturing apparatus 2 rubs the concave surface 13A and the convex surface 14A to remove air bubbles from the adhesive 20, and spreads the adhesive 20 thinly on the entire surfaces of the concave surface 13A and the convex surface 14A. Then, in step ST150, the manufacturing apparatus 2 removes the adhesive 20 protruding from the end face.

In the following, for convenience of explanation, the combination of the plano-concave lens 13 and the plano-convex lens 14 in which the adhesive 20 in a liquid state is filled between the concave surface 13A and the convex surface 14A is also referred to as a pre-bonding optical element 10X. It should be noted that at least one of the plurality of steps included in the filling step of step ST100 may be performed manually without using the manufacturing apparatus 2.

As an example, as shown in FIG. 10, in the pre-bonding optical element 10X, the adhesive 20 filled between the plano-concave lens 13 and the plano-convex lens 14 is in a liquid state, and the liquid state first adhesive 20A and the liquid state. It is a solution mixed with the second adhesive 20B in the state. The liquid adhesive 20 is an example of a "solution" according to the technique of the present disclosure.

The adhesive 20 contains an ultraviolet curable resin 21 in a liquid state (before curing). The UV curable resin 21 has a monomer 23 and a polymerization initiator 24. Although the monomer 23 is illustrated here, the ultraviolet curable resin 21 may contain an oligomer in addition to the monomer 23.

The monomer 23 is roughly classified into a first monomer 23A and a second monomer 23B. The first monomer 23A and the second monomer 23B are examples of "two materials" and "two kinds of cured resins" according to the technique of the present disclosure. The first monomer 23A and the second monomer 23B are cured by reacting with ultraviolet UV given from the outside. Further, the first monomer 23A and the second monomer 23B have different reaction rates to ultraviolet UV. An example of the first monomer 23A is a methacrylic acid-based monomer (for example, methyl methacrylate). An example of the second monomer 23B is an acrylic acid-based monomer (for example, methyl acrylate).

When the adhesive 20 thus configured is filled between the plano-concave lens 13 and the plano-convex lens 14, for example, when ultraviolet UV is irradiated from the plano-concave lens 13 side, the ultraviolet UV transmitted through the plano-concave lens 13. Causes the polymerization initiator 24 to generate radicals. As a result, the radical polymerization reaction of the monomer 23 centered on the polymerization initiator 24 is started, and the ultraviolet curable resin 21 is gradually polymerized by repeating the chained addition reaction of the monomer 23.

At the initial stage of UV UV irradiation, the UV curable resin 21 is still in a liquid state, and the UV curable resin 21 is formed with a system having a large number of isolated small molecular weight molecular chains. When the radical polymerization reaction proceeds with the passage of time, the ultraviolet curable resin 21 becomes a gel.

When the radical polymerization reaction further proceeds, substantially all the monomers 23 are polymerized, and the radical polymerization reaction is stopped, the ultraviolet curable resin 21 becomes a solid state.

The refractive index when the first adhesive 20A is cured and becomes a solid state is higher than the refractive index when the second adhesive 20B is cured and becomes a solid state. Further, the wavelength dispersion when the first adhesive 20A is cured and becomes a solid state is lower than the wavelength dispersion when the second adhesive 20B is cured and becomes a solid state. That is, it can be said that the first adhesive 20A in the solid state is a material having a high refractive index and low dispersion when compared with the second adhesive 20B in the solid state. On the contrary, the solid state second adhesive 20B can be said to be a low refractive index and high dispersion material when compared with the solid state first adhesive 20A.

By the way, since the reaction rate of the first monomer 23A to ultraviolet UV and the reaction rate of the second monomer 23B to ultraviolet UV are different, the curing rate by irradiation with ultraviolet UV is also different from that of the first monomer 23A. It is different from the second monomer 23B. Since the main component of the first adhesive 20A is the first monomer 23A and the main component of the second adhesive 20B is the second monomer 23B, the first monomer 23A and the second monomer 23B are cured. The difference in the rate means that the rate of curing of the first adhesive 20A and the rate of curing of the second adhesive 20B are different.

Due to the difference between the curing rate of the first adhesive 20A and the curing rate of the second adhesive 20B, the first adhesive in the bonding layer 15 is in the process of transitioning from the liquid state to the solid state of the adhesive 20. There is a difference between the concentration of 20A and the concentration of the second adhesive 20B. The difference between the concentration of the first adhesive 20A and the concentration of the second adhesive 20B in the bonding layer 15 is the refractive index distribution 114 (see FIG. 20) in the bonding layer 15 in which the adhesive 20 is in a solid state. Appears. That is, in the bonding layer 15, the radical polymerization reaction of the monomer 23 is started, and the refractive index distribution 114 based on the concentration ratio of the first adhesive 20A and the second adhesive 20B is repeated by repeating the chained addition reaction of the monomer 23 (FIG. 20). See) is formed. Since the main component of the first adhesive 20A is the first monomer 23A and the main component of the second adhesive 20B is the second monomer 23B, the bonding layer in which the adhesive 20 is in a solid state In 15, the concentration ratio of the first monomer 23A and the second monomer 23B appears as a refractive index distribution 114 (see FIG. 20).

In order to increase the degree of freedom in designing the refractive index and wavelength dispersion of the bonding layer 15, the first adhesive 20A contains the first inorganic nanoparticles 25A, and the second adhesive 20B contains the second inorganic nanoparticles. It is preferable that 25B is contained. When the metal nanoparticles are not contained, the silane coupling agent 26 becomes unnecessary. If the inorganic nanoparticles 25 and the silane coupling agent 26 are not required in this way, it is possible to contribute to the reduction of material cost.

When the first adhesive 20A contains the first inorganic nanoparticles 25A and the second adhesive 20B contains the second inorganic nanoparticles 25B, the first adhesive 20A is the first monomer. It has 23A and 25A of first inorganic nanoparticles. The inorganic nanoparticles 25A are surface-modified with the first silane coupling agent 26A. The second adhesive 20B has a second monomer 23B and a second inorganic nanoparticles 25B. The second inorganic nanoparticles 25B are surface-modified with the second silane coupling agent 26B. The first inorganic nanoparticles 25A are nanoparticles that react with the first monomer 23A. As an example of the _first inorganic nanoparticles 25A, metal oxide nanoparticles such as ZrO2 nanoparticles can be mentioned. The second inorganic nanoparticles 25B are nanoparticles that react with the second monomer 23B. Examples of the second inorganic nanoparticles 25B include metal oxide nanoparticles such as ITO (Indium Tin Oxide) nanoparticles. The inorganic nanoparticles may be metal nanoparticles or nanoparticles in which a metal and a metal oxide are combined, for example, nanoparticles having a core-shell structure.

In the following, for convenience of explanation, when it is not necessary to particularly distinguish between the first inorganic nanoparticles 25A and the second inorganic nanoparticles 25B, they are referred to as "inorganic nanoparticles 25". Further, in the following, for convenience of explanation, when it is not necessary to particularly distinguish between the first silane coupling agent 26A and the second silane coupling agent 26B, it is referred to as "silane coupling agent 26".

As will be described in detail later, the silane coupling agent 26 has a reactive group that binds to the organic material and the inorganic material (for example, a reactive group that binds to the organic material and a reactive group that binds to the inorganic material) in the molecule. , The organic material and the inorganic material are bonded using a reactive group.

The inorganic nanoparticles 25 bind to the monomer 23 via the silane coupling agent 26 to control the refractive index in the bonding layer 15 and control the wavelength dispersion in the bonding layer 15.

As an example, as shown in FIG. 11, the first inorganic nanoparticles 25A are different from the first polymer 27A produced by radical polymerization reaction of a plurality of first monomers 23A (see FIG. 10). It is bound via the silane coupling agent 26A of 1.

The first silane coupling agent 26A has an organic reactive group X1 which is the same reactive group as the first polymer 27A, and the organic reactive group X1 is chemically reacted with the first polymer 27A (radical polymerization reaction). By allowing it to bind to the first polymer 27A. Further, the first silane coupling agent 26A has an inorganic reactive group R1 and is bonded to the first inorganic nanoparticles 25A by chemically reacting the inorganic reactive group R1 with the first inorganic nanoparticles 25A. do. As described above, the first silane coupling agent 26A chemically reacts with the first polymer 27A and the first inorganic nanoparticles 25A, whereby the organic reactive group X1 with respect to the first inorganic nanoparticles 25A. Is surface-modified.

In the example shown in FIG. 11, a methacrylic acid-based polymer is shown as an example of the first polymer 27A. In this case, for example, a methacrylic group is used as the organic reaction group X1. Moreover, as an example of the inorganic reaction group R1, a methoxy group, an ethoxy group and the like can be mentioned.

The second inorganic nanoparticles 25B are formed by subjecting a plurality of second monomers 23B (see FIG. 10) to a radical polymerization reaction with respect to the second polymer 27B via a second silane coupling agent 26B. Is combined.

The second silane coupling agent 26B has an organic reactive group X2 which is the same reactive group as the second polymer 27B, and the organic reactive group X2 is chemically reacted with the second polymer 27B (radical polymerization reaction). By letting it bind to the second polymer 27B. Further, the second silane coupling agent 26B has an inorganic reactive group R2, and by chemically reacting the inorganic reactive group R2 with the second inorganic nanoparticles 25B, it binds to the second inorganic nanoparticles 25B. do. As described above, the second silane coupling agent 26B chemically reacts with the second polymer 27B and the second inorganic nanoparticles 25B, whereby the organic reactive group X2 with respect to the second inorganic nanoparticles 25B. Is surface-modified.

In the example shown in FIG. 11, an acrylic acid-based polymer is shown as an example of the second polymer 27B. In this case, for example, an acryloyl group is used as the organic reaction group X2. Moreover, as an example of an inorganic reaction group R2, a methoxy group, an ethoxy group and the like can be mentioned.

Here, with reference to FIGS. 12 and 13, the characteristics of the copolymerization reaction when the two types of monomers A and B are mixed will be described.

FIG. 12 schematically shows an example of a copolymerization reaction using two types of monomers, monomer A and monomer B. In the example shown in FIG. 12, _kAA is a reaction rate coefficient when the radical of the monomer A added to the polymer R and the monomer A react and bond with each other, and _KAB is added to the polymer R. It is a reaction rate coefficient when the radical of the monomer A and the monomer B are reacted and bonded, and _KBA is the case where the radical of the monomer B added to the polymer R and the monomer A are reacted and bonded. It is a reaction rate coefficient, and _KBB is a reaction rate coefficient when the radical of the monomer B added to the polymer R and the monomer B react and bond with each other. The reaction ratio r1 is the ratio of the reaction rate coefficient _kAA to _KAB , and the reaction ratio r2 is the ratio of _KBA to _KBB .

The reactivity ratio r1 indicates the ease of reaction between the monomers A, and the reactivity ratio r2 indicates the ease of reaction between the monomers B. Therefore, in the copolymerization reaction between the monomer A and the monomer B, the concentration ratios of the monomer A and the monomer B change depending on the reactivity ratios r1 and r2. If the concentration ratio of the monomer A and the monomer B changes, the composition ratio of the monomer A and the monomer B in the polymer also changes.

In order to determine the composition ratio of the monomer A and the monomer B in the polymer, for example, the concentration of the monomer A before curing and the monomer in the polymer obtained by the copolymerization reaction using the monomer A and the monomer B It is important to understand the correspondence with the composition ratio of A in advance. The relationship between the concentration of the monomer A before curing and the composition ratio of the monomer A in the polymer (occupancy of the monomer A in the polymer) is, for example, as shown in FIG. 13, the copolymer composition curves F1 to F5. Commonly known as. The copolymerization composition curves F1 to F5 are curves when the monomer A is common and the types of the monomers B are different. In the example shown in FIG. 13, the copolymer composition curves F1 to F5 corresponding to the five types of monomers B are shown. In the copolymer composition curves F1 to F5, the horizontal axis shows the concentration of the monomer A before curing, and the vertical axis shows the composition ratio of the monomer A in the polymer.

In the example shown in FIG. 13, the copolymerization composition curve F1 is a curve in which the reactivity ratio r1> 1 and the reactivity ratio r2 <1 are established. The copolymerization composition curve F1 shows a characteristic that the composition ratio of the monomer A is higher than that of the monomer B in the polymer even if the concentrations of the monomer A and the monomer B before curing are the same. The copolymer composition curve F1 is a copolymer composition curve when the monomer A is methyl methacrylate and the monomer B is methyl acrylate. The reactivity ratio r1 of methyl methacrylate is "1.91" and the reactivity ratio r2 of methyl acrylate is "0.50".

As an example, as shown in FIG. 14, the main body 11 has a light source 30, an irradiation optical system 31, an intensity modulation element 32, and a stage 33. The light source 30 emits ultraviolet UV under the control of the light source driver 35. The light source 30 is, for example, an LED (Light Emitting Diode) and / or a black light. The irradiation optical system 31 irradiates the ultraviolet UV emitted from the light source 30 toward the pre-bonding optical element 10X. The intensity modulation element 32 modulates the intensity of ultraviolet UV rays that have passed through the irradiation optical system 31 under the control of the intensity modulation element driver 36. The intensity modulation element 32 is, for example, an element using a liquid crystal display, and can increase or decrease the intensity of ultraviolet UV rays in a specific region of the pre-junction optical element 10X as compared with other regions. The stage 33 holds the pre-junction optical element 10X. The intensity modulation element 32 may be an element using a DMD (Digital Micromirror Device).

The main body 11 further includes a receiving unit 37, a read / write (hereinafter abbreviated as RW (Read Write)) control unit 38, a storage unit 39, and a main control unit 40. The receiving unit 37 receives the ultraviolet UV irradiation profile 41 from the control device 12. The receiving unit 37 outputs the irradiation profile 41 to the RW control unit 38.

The RW control unit 38 stores the irradiation profile 41 in the storage unit 39. Further, the RW control unit 38 reads out the irradiation profile 41 from the storage unit 39 and outputs the irradiation profile 41 to the main control unit 40. The RW control unit 38 rewrites the irradiation profile 41 of the storage unit 39 each time a new irradiation profile 41 is received by the receiving unit 37. The storage unit 39 is also referred to as a memory or a storage device, and is, for example, a flash memory.

The main control unit 40 controls the overall operation of the main body 11. Specifically, the main control unit 40 operates the light source driver 35 and the intensity modulation element driver 36 according to the irradiation profile 41. The main control unit 40 is a computer equipped with a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory).

As an example, as shown in FIG. 15, the control device 12 is a device realized by a computer, and the control device 12 includes a storage device 50, a memory 51, a CPU 52, a communication unit 53, a display 54, and an input device 55. ing. These are interconnected via a bus 56.

The storage device 50 is a hard disk drive built in the control device 12. The storage device 50 stores control programs such as an operating system, various application programs, and various data associated with these programs. Here, the control device 12 has a built-in hard disk drive, but the present invention is not limited to this, and the hard disk drive may be connected to the control device 12 via a cable and / or a network or the like. Further, a solid state drive may be used instead of the hard disk drive.

The memory 51 is a work memory used by the CPU 52. The CPU 52 comprehensively controls each part of the computer by loading the program stored in the storage device 50 into the memory 51 and executing the processing according to the program.

The communication unit 53 is a network interface that controls transmission of various information via a network such as a LAN (Local Area Network). The communication unit 53 is responsible for communication with the main body 11. The display 54 displays various screens under the control of the CPU 52. The control device 12 receives input of an operation instruction from the input device 55 through various screens. The input device 55 is a keyboard, a mouse, a touch panel, or the like.

The operation program 60 is stored in the storage device 50 of the control device 12. The operation program 60 is an application program for operating the computer as the control device 12. The storage device 50 also stores the irradiation profile 41 and the generation reference information 61.

When the operation program 60 is started, the CPU 52 operates as a display control unit 65, a reception unit 66, a generation unit 67, an RW control unit 68, and a transmission unit 69 in cooperation with the memory 51 and the like.

The display control unit 65 controls the display of various screens on the display 54. The various screens include a setting screen 80 (see FIG. 17) used for setting the refractive index distribution information 75 and the like.

The reception unit 66 receives the refractive index distribution information 75, the first optical element information 76, the second optical element information 77, and the adhesive information 78 set by the input device 55 through the setting screen 80. The reception unit 66 outputs the refractive index distribution information 75, the first optical element information 76, the second optical element information 77, and the adhesive information 78 to the generation unit 67.

The generation unit 67 generates an irradiation profile 41 from the refractive index distribution information 75, the first optical element information 76, the second optical element information 77, and the adhesive information 78 with reference to the generation reference information 61. The generation reference information 61 is a data table, a function, and a data table having the refractive index distribution information 75, the first optical element information 76, the second optical element information 77, and the adhesive information 78 as input data, and the irradiation profile 41 as output data. / Or a machine learning model or the like. The generation unit 67 outputs the irradiation profile 41 to the RW control unit 68.

The RW control unit 68 controls the storage of various data in the storage device 50 and the reading of various data in the storage device 50. For example, the RW control unit 68 reads the generation reference information 61 from the storage device 50 and outputs it to the generation unit 67.

The RW control unit 68 stores the irradiation profile 41 from the generation unit 67 in the storage device 50. Further, the RW control unit 68 reads the irradiation profile 41 from the storage device 50 and outputs the irradiation profile 41 to the transmission unit 69. The transmission unit 69 transmits the irradiation profile 41 to the main body 11.

As an example, as shown in FIG. 17, the setting screen 80 has a refractive index distribution information input area 81, a first optical element information input area 82, a second optical element information input area 83, a first adhesive information input area 84, and A graphic user interface having a second adhesive information input area 85.

The refractive index distribution information input area 81 is a screen area used for inputting the refractive index distribution information 75. The refractive index distribution information 75 is information showing the refractive index distribution 114 (see FIGS. 18 and 20) described later. As will be described in detail later, the refractive index distribution 114 is a necessary condition for the subject light to pass within the film thickness of the bonding layer 15, and is an inequality of “h <t · tan θc” (see FIG. 20) and “θc =”. The distribution is such that the equation of "asin (Na / Nb)" (see FIG. 20) holds.

The refractive index distribution information input area 81 is provided with an input box 87 and a reference button 88. The input box 87 is a box in which a file name representing the refractive index distribution information 75 is input. The reference button 88 is a button that is turned on when searching a file representing the refractive index distribution information 75 from the file directory.

The first optical element information input area 82 and the second optical element information input area 83 are information about the first optical element and the second optical element, that is, the first optical element information 76 (see FIG. 16) and the second optical element information. This is a screen area used for inputting 77 (see FIG. 16). Here, the first optical element and the second optical element refer to, for example, a pair of lenses used in the junction optical element 10. In this embodiment, a plano-concave lens 13 (see FIGS. 1 and 2) is used as the first optical element, and a plano-convex lens 14 (see FIGS. 1 and 3) is used as the second optical element. ing.

The pull-

down menu boxes

89 and 90 are provided in the first optical element information input area 82. When the menu button of the pull-down menu box 89 is turned on, a pull-down menu listing a plurality of types of lenses that can be used as the first optical element is displayed. The plurality of lens types displayed in the pull-down menu are selectively selected according to the instructions received by the input device 55 (see FIGS. 15 and 16), and the selected lens type is displayed in the pull-down menu box 89. It is displayed in the column.

When the menu button of the pull-down menu box 90 is turned on, a pull-down menu listing the materials of the lenses selected using the pull-down menu box 89 is displayed. The plurality of materials displayed in the pull-down menu are selectively selected according to the instructions received by the input device 55 (see FIGS. 15 and 16), and the selected material is displayed in the display field of the pull-down menu box 90. To.

Input boxes

91, 92 and 93 are provided in the first optical element information input area 82. The outer diameter of the lens selected using the pull-down menu box 89 is input to the input box 91 according to the instructions accepted by the input device 55 (see FIGS. 15 and 16). In the input box 92, the thickness of the lens selected using the pull-down menu box 89 (denoted as “center thickness” in the example shown in FIG. 17) is an instruction received by the input device 55 (see FIGS. 15 and 16). Is entered according to. In the input box 93, the radius of curvature of the lens selected using the pull-down menu box 89 is input according to the instructions accepted by the input device 55 (see FIGS. 15 and 16). The unit of the outer diameter of the lens, the thickness of the center of the lens, and the radius of curvature of the lens is mm.

The second optical element information input area 83 is a screen area used for the same purpose as the first optical element information input area 82 for the second optical element information 77, and is a pull-down menu box 94 corresponding to the pull-down menu box 89. It has a pull-down menu box 95 corresponding to the menu box 90, an input box 96 corresponding to the input box 91, an input box 97 corresponding to the input box 92, and an input box 98 corresponding to the input box 93.

The first adhesive information input area 84 and the second adhesive information input area 85 are screen areas used for inputting the adhesive information 78 (see FIG. 16). The adhesive information 78 is information about the first adhesive 20A and information about the second adhesive 20B.

The first adhesive information input area 84 is a screen area used for inputting information regarding the first adhesive 20A. The first adhesive information input area 84 is provided with pull-

down menu boxes

99, 100 and 101. When the menu button of the pull-down menu box 99 is turned on, a pull-down menu listing the types of monomers used in the first adhesive 20A is displayed. The plurality of monomer types displayed in the pull-down menu are selectively selected according to the instructions received by the input device 55 (see FIGS. 15 and 16), and the selected monomer type is displayed in the pull-down menu box 99. It is displayed in the column.

When the menu button of the pull-down menu box 100 is turned on, a pull-down menu listing the types of inorganic particles used in the first adhesive 20A is displayed. The plurality of inorganic particle types displayed in the pull-down menu are selectively selected according to the instructions received by the input device 55 (see FIGS. 15 and 16), and the selected inorganic particle type is selected in the pull-down menu box 100. It is displayed in the display field of.

When the menu button of the pull-down menu box 101 is turned on, a pull-down menu listing the types of organic reactive groups used in the first adhesive 20A is displayed. The types of the plurality of organic reactive groups displayed in the pull-down menu are selectively selected according to the instructions received by the input device 55 (see FIGS. 15 and 16), and the selected organic reactive group types are selected in the pull-down menu. It is displayed in the display field of the box 101.

The second adhesive information input area 85 is a screen area used for the same purpose as the first adhesive information input area 84 for the second adhesive 20B, and is a pull-down menu box corresponding to the pull-

down menu boxes

99, 100, and 101. It has 102, 103 and 104.

After input to the refractive index distribution information input area 81, the first optical element information input area 82, the second optical element information input area 83, the first adhesive information input area 84, and the second adhesive information input area 85 is completed. , The setting button 110 is turned on. As a result, the refractive index distribution information 75, the first optical element information 76, the second optical element information 77, and the adhesive information 78 are received by the reception unit 66 (see FIG. 16).

As shown in FIG. 18 as an example, the refractive index distribution information 75 is a numerical value representing a refractive index distribution 111 that changes in a blazed manner from the center of the bonding layer 15 in a plan view to the outer periphery of the bonding layer 15 in a plan view. Here, the refractive index that changes from the center of the bonding layer 15 in the plan view toward the outer periphery of the bonding layer 15 in a plan view is, in other words, the refractive index that changes from the center of the bonding optical element 10 to the outside. It means the refractive index. In order to realize such a blazed refractive index distribution 111, the irradiation profile 41 shown in FIG. 19 is used by the main control unit 40 (see FIG. 14) as an example.

The irradiation profile 41 has an irradiation profile 41A for the concentration distribution forming step and an irradiation profile 41B for the main curing step. The irradiation profile 41A for the concentration distribution forming step is used in the concentration distribution forming step (see FIG. 8), and the irradiation profile 41B for the main curing step is used in the main curing step (see FIG. 8).

The concentration distribution forming step is shown in FIG. 10 as an example by irradiating the liquid adhesive 20 filled between the plano-concave lens 13 and the plano-convex lens 14 with ultraviolet UV rays by the filling step exemplified in FIG. This is a step of forming a concentration distribution in the adhesive 20 as described above. The concentration distribution forming step may be referred to as a temporary curing step in the sense of contrasting with the main curing step.

In the concentration distribution forming step, the illuminance of the ultraviolet UV is changed by the intensity modulation element 32 according to the irradiation profile 41A for the concentration distribution forming step, so that the curing speed of the adhesive 20 is made different in a plurality of regions. In the concentration distribution forming step, for example, ultraviolet UV having a center wavelength of 365 nm is irradiated.

As an example, as shown in FIG. 19, the irradiation profile 41A for the concentration distribution forming step has an irradiation time 41A1 and an illuminance distribution information 41A2. The irradiation time 41A1 is the time during which the ultraviolet UV is irradiated to the adhesive 20 in the concentration distribution forming step (for example, the time during which the ultraviolet UV is irradiated for each region R_A to R_K described later). An example of the irradiation time 41A1 is several tens of seconds (for example, 90 seconds).

The illuminance distribution information 41A2 is numerical data representing the illuminance distribution 112. The illuminance distribution 112 is an example of the "energy distribution corresponding to the shape of the refractive index distribution" and the "blazeed type reference energy distribution" according to the technique of the present disclosure. The illuminance distribution 112 is the distribution of the illuminance of ultraviolet UV rays irradiated to the adhesive 20 in the concentration distribution forming step. The shape of the illuminance distribution 112 corresponds to the shape of the refractive index distribution 111 (see FIG. 18). That is, in the illuminance distribution 112, the illuminance of the ultraviolet UV changes in a blazed shape from the center of the bonding layer 15 in a plan view to the outside.

The joining layer 15 is concentrically divided into a plurality of regions in a plan view. In the example shown in FIG. 19, the bonding layer 15 is divided into a plurality of regions R_A to R_K from the center in a plan view to the outside. The rate of change in the illuminance of ultraviolet UV is one of two different rates of change, the first rate of change in illuminance and the second rate of change in illuminance. The second illuminance change rate is larger than the first illuminance change rate. The illuminance distribution 112 includes a second irradiation range 112B, which is a range in which ultraviolet UV rays are irradiated at a second illuminance change rate from the center to the outside in the entire region of the junction layer 15 in a plan view, and a first illuminance change. It is a blaze-type distribution in which the first irradiation range 112A, which is the range in which ultraviolet rays and UV rays are irradiated at a rate, are alternately connected. In other words, the second illuminance change rate is the rate of change in the direction opposite to the first illuminance change rate (change rate of the opposite polarity), and the first irradiation range 112A and the second irradiation range 112B are regions. From R_A to the region R_K, the illuminance is alternately alternated in region units while maintaining the continuity of the illuminance.

In the main curing step, the illuminance of ultraviolet UV is controlled by the intensity modulation element 32 according to the irradiation profile 41B for the main curing step. In this curing step, for example, ultraviolet UV having a wavelength of 310 nm to 400 nm is irradiated. No heating is performed before the main curing step.

The irradiation profile 41B for the main curing step has an irradiation time 41B1 and an illuminance distribution information 41B2. The irradiation time 41B1 is the time during which the ultraviolet UV is irradiated to the adhesive 20 (for example, the time during which the ultraviolet UV is irradiated for each region R_A to R_K) in the main curing step. An example of the irradiation time 41B1 is several tens of minutes (for example, 30 minutes).

The illuminance distribution information 41B2 is numerical data representing the illuminance distribution 113. The illuminance distribution 113 is the distribution of the illuminance of ultraviolet UV rays irradiated to the adhesive 20 in the main curing step. In the illuminance distribution 113, the illuminance of ultraviolet UV rays is uniformly distributed from the center of the bonding layer 15 in a plan view to the outside.

As described above, when the adhesive 20 is irradiated with ultraviolet UV according to the illuminance distribution 112 in the concentration distribution forming step and then the ultraviolet UV is irradiated to the adhesive 20 according to the illuminance distribution 113 in the main curing step, FIG. 20 shows as an example. As shown, the refractive index distribution 114 is obtained. The shape of the refractive index distribution 114 is a blazed type and corresponds to the shape of the irradiation distribution 112. That is, the refractive index of the bonding layer 15 changes in a blazed shape from the center of the bonding layer 15 in a plan view to the outside.

The refractive index distribution 114 is a distribution in which the first refractive index change range 114A corresponding to the first irradiation range 112A and the second refractive index change range 114B corresponding to the second irradiation range 112B are alternately connected. .. The first refractive index change range 114A is a range in which the refractive index changes at the first rate of change corresponding to the first illuminance change rate. The second refractive index change range 114B is a range in which the refractive index changes at the second rate of change corresponding to the second illuminance change rate. That is, in the refractive index distribution 114 as well as the illuminance distribution 112, the first refractive index change range 114A and the second refractive index change range 114B extend from the region R_A to the region R_K (see FIG. 19), and the refractive index is continuous. While maintaining the sex, they are alternately alternated in area units.

Here, the fact that the first rate of change corresponds to the first rate of change in illuminance means that the tendency of the distribution of the illuminance of ultraviolet UV rays irradiated by the first rate of change in illuminance and the range of change in the first refractive index. It means that the tendency of the distribution of the refractive index at 114A is in agreement. Further, the fact that the second rate of change corresponds to the second rate of change in illuminance means that the tendency of the distribution of the illuminance of the ultraviolet UV irradiated at the second rate of change in illuminance and the second range of change in the refractive index 114B. It means that the tendency of the distribution of the refractive index in. This means that in the plan view of the bonding layer 15, the first refractive index change range 114A and the first irradiation range 112A coincide with each other, and the second refractive index change range 112B and the second irradiation range 112B coincide with each other. , It means that the second rate of change is a larger rate of change than the first rate of change, and the second rate of change is the rate of change in the opposite direction to the first rate of change (the rate of change of the opposite polarity). do.

The illuminance of the ultraviolet UV rays in the second irradiation range 112B changes from the center of the plan view of the bonding layer 15 to the outside at the second illuminance change rate for each region corresponding to the second irradiation range 112B. There is. Therefore, as described above, the second refractive index change range 114B corresponds to the second irradiation range 112B, and the second change rate corresponds to the second illuminance change rate. The refractive index of the refractive index change range 114B of 2 is also a region corresponding to the second refractive index change range 114B from the center of the bonding layer 15 in a plan view to the outside (along the radial direction of the bonding optical element 10). Each time, it changes at the second rate of change.

The refractive index distribution 114 has an inequality of "h <t · tan θc" and an equation of "θc = asin (Na / Nb)" as necessary conditions for the subject light to pass within the film thickness of the bonding layer 15. It is said that the distribution holds. Here, "Na" is the minimum refractive index. "Nb" is the maximum refractive index. “T” is the change width of the second refractive index change range 114B, that is, the radial length of the second refractive index change range 114B in the plan view of the bonding layer 15. Here, the radial direction refers to the radial direction of the bonding layer 15, that is, the radial direction of the bonding optical element 10. “H” is the thickness of the bonding layer 15, that is, the film thickness of the bonding layer 15. “Θc” is a critical angle. The angle of incidence is the optical path of the subject light incident on the junction surface of adjacent layers (for example, the junction surface between the plano-concave lens 13 and the junction layer 15 and the junction surface between the junction layer 15 and the plano-convex lens 14). Refers to an angle. The angle of the optical path of the subject light incident on the joint surface of the adjacent layer refers to the angle of the joint surface with respect to the normal.

As an example, as shown in FIG. 21, the refractive index of the bonding layer 15 is "N _λ ", the refractive index of the first adhesive 20A is "NA _λ ", and the refractive index of the second adhesive 20B is "NB". When " _λ " is used and the concentration of the first adhesive 20A is "α", the equation "N _λ = α · NA _λ + (1-α) · NB _λ " is established. Further, when the film thickness of the bonding layer 15 is "d", the transmitted wavefront (phase difference) of the bonding layer 15 can be represented by "N _λ · d". The transmitted wavefront of the bonding layer 15 appears in a blazed shape having a height corresponding to the wavelength λ of the light incident on the bonding layer 15 from the center of the plan view of the bonding layer 15 to the outside.

Next, the operation of the junction optical element 10 will be described.

The bonding layer 15 included in the bonding optical element 10 has a blazed refractive index distribution 114 (see FIGS. 18 and 20) from the center of the bonding layer 15 to the outside in a plan view. Therefore, the bonding layer 15 exhibits the maximum diffraction efficiency at a specific diffraction order (for example, +1 order) without using a physical surface structure having a blazed shape as in the laminated blazed diffraction optical element 506.

Further, in the examples shown in FIGS. 5 to 7, since the laminated blazed diffraction grating element 506 diffracts light using the physical surface structure of the blazed shape, it is processed into a steep slope forming the blazed shape. If the marks remain, scattering will occur due to the processing marks. On the other hand, the bonding layer 15 does not have a blazed physical surface structure. That is, there is no room for processing marks on the joint layer 15. The bonding layer 15 is less likely to cause scattering than the laminated blazed diffraction optical element 506.

Further, as shown in FIG. 22 as an example, since the bonding layer 15 does not have a blazed-shaped physical surface structure, the degree of refraction of the subject light incident on the bonding layer 15 is the laminated blazed diffraction. It is smaller than the degree of refraction of the subject light on the steep slope of the optical element 506 (see "conventional reflected light path" shown in FIG. 23). Therefore, the subject light refracted on the steep slope of the laminated blazed diffraction optical element 506 does not fit in the specific diffraction order and appears as a ghost, but most of the subject light incident on the bonding layer 15 has a specific diffraction. It is within the order and the loss of the amount of light to other diffraction orders (eg, 0th order light, -1st order light, etc.) is minimized. Therefore, the bonding layer 15 can suppress ghosts caused by refracted light as compared with the laminated blazed diffraction optical element 506 that diffracts light by utilizing a blazed-shaped physical surface structure.

Further, as shown in FIG. 23 as an example, since the bonding layer 15 does not have a blazed-shaped physical surface structure unlike the laminated blazed grating optical element 506, it has a blazed-shaped physical surface structure. Compared to the laminated blazed grating 506 that uses and diffracts light, the subject light is less likely to be totally reflected. Therefore, the subject light totally reflected on the steep slope of the laminated blazed diffractive optical element 506 does not fit in the specific diffraction order and appears as a ghost, but the amount of most of the subject light incident on the bonding layer 15 is specific. It fits in the diffraction order, and the loss of the light amount to other diffraction orders (for example, 0th order light and -1st order light) is minimized. Therefore, the bonding layer 15 can suppress ghosts caused by reflected light as compared with the laminated blazed diffraction optical element 506 that diffracts light by utilizing a blazed-shaped physical surface structure.

As described above, in the bonding optical element 10, a blazed refractive index distribution 111 (see FIGS. 18 and 20) is formed in the bonding layer 15 from the center of the bonding layer 15 in a plan view to the outside. Therefore, according to this configuration, ghosts caused by incident light can be suppressed as compared with a transmission type diffraction optical element that diffracts light by utilizing a blazed-shaped physical surface structure. Further, according to the method for manufacturing the junction optical element 10 as described above, it is possible to manufacture a diffractive optical element capable of suppressing wavelength dispersion more easily than before.

Further, in the bonding optical element 10, the refractive index of the polymerized first adhesive 20A in the bonding layer 15 is higher than the refractive index of the polymerized second adhesive 20B. Therefore, according to this configuration, it becomes easier to form a blazed-type refractive index distribution from the center in the plan view to the outside of the bonding layer 15 as compared with the case where only one type of adhesive is used.

Further, in the bonding optical element 10, the wavelength dispersion of the polymerized first adhesive 20A in the bonding layer 15 is lower than the wavelength dispersion of the polymerized second adhesive 20B. Therefore, according to this configuration, it becomes easier to form a blazed wavelength dispersion distribution from the center in a plan view to the outside of the bonding layer 15 as compared with the case where only one type of adhesive is used.

Further, in the bonding optical element 10, in the bonding layer 15, the reaction rate of the first monomer 23A contained in the first adhesive 20A with respect to ultraviolet UV and the reaction rate of the second monomer 23B contained in the second adhesive 20B with respect to ultraviolet UV of the second monomer 23B. The reaction rate is different. Therefore, according to this configuration, it is possible to easily adjust the concentration ratio of the first monomer 23A and the second monomer 23B as compared with the case where the reaction rates of the two types of monomers are the same.

Further, in the bonding optical element 10, in the bonding layer 15, the first adhesive 20A contains the first inorganic nanoparticles 25A that react with the first monomer 23A (see FIG. 10). Therefore, according to this configuration, the refractive index and the refractive index when the plurality of first monomers 23A are polymerized as compared with the case where the first adhesive 20A is composed of only the first monomer 23A and the polymerization initiator 24. The degree of freedom in determining the dispersion characteristics can be increased.

Further, in the bonding optical element 10, in the bonding layer 15, the same organic reactive group X1 as the first monomer 23A is surface-modified to the first inorganic nanoparticles 25A (see FIG. 11). Therefore, according to this configuration, it is possible to polymerize the first polymer 27A obtained by curing the plurality of first monomers 23A and the first inorganic nanoparticles 25A.

Further, in the bonding optical element 10, in the bonding layer 15, the second adhesive 20B contains the second inorganic nanoparticles 25B that react with the second monomer 23B (see FIG. 10). Therefore, according to this configuration, the refractive index and the refractive index when the plurality of second monomers 23B are polymerized as compared with the case where the second adhesive 20B is composed of only the second monomer 23B and the polymerization initiator 24. The degree of freedom in determining the dispersion characteristics can be increased.

Further, in the bonding optical element 10, in the bonding layer 15, the same organic reactive group X2 as the second monomer 23B is surface-modified to the second inorganic nanoparticles 25B (see FIG. 11). Therefore, according to this configuration, it is possible to polymerize the second polymer 27B obtained by curing the plurality of second monomers 23B and the second inorganic nanoparticles 25B.

Further, in the bonding optical element 10, in the bonding layer 15, the blaze-type refractive index distribution 114 is larger than the first refractive index change range 114A and the first rate of change in which the refractive index changes at the first rate of change. The distribution is such that the second refractive index change range 114B, in which the refractive index changes at the second rate of change, is alternately connected. That is, the bonding layer 15 does not diffract light by using a blazed-shaped physical surface structure, but diffracts light by using a blazed-type refractive index distribution 114. Therefore, according to this configuration, since the bonding layer 15 does not have a blazed-shaped physical surface structure, it is compared with a transmission type diffraction optical element that diffracts light by using the blazed-shaped physical surface structure. , Scattering can be suppressed.

Further, in the bonding optical element 10, the second rate of change in the bonding layer 15 is the rate of change in the direction opposite to the first rate of change. Therefore, according to this configuration, higher diffraction efficiency can be realized as compared with the case where the second rate of change is the rate of change in the same direction as the first rate of change.

Further, in the bonding optical element 10, in the bonding layer 15, the refractive index of the second refractive index change range 114B changes at the second rate of change from the center of the bonding layer 15 in a plan view to the outside. Therefore, according to this configuration, the refractive index of the second refractive index change range 114B does not change outward from the center of the plan view of the bonding layer 15, as compared with the case where the light incident on the bonding layer 15 does not change. The degree of scattering, refraction, and reflection can be moderated.

Further, in the bonding optical element 10, in the bonding layer 15, "Na" is the minimum refractive index, "Nb" is the maximum refractive index, "t" is the change width of the second refractive index change range 114B, and "h". When "" is the thickness of the bonding layer 15 and "θc" is the critical angle, the refractive index distribution 114 is set to "h <t. Tan θc" as a necessary condition for the subject light to pass within the film thickness of the bonding layer 15. The distribution is such that the inequality of "" and the equation of "θc = asin (Na / Nb)" are satisfied. Therefore, according to this configuration, the change width of the second refractive index change range 114B is used under the condition that the inequality of “h <t ・ tanθc” and the equation of “θc = asin (Na / Nb)” do not hold. Compared with the case where the thickness of the bonding layer 15 is determined, the change width of the second refractive index change range 114B and the thickness of the bonding layer 15 where ghosts are less likely to occur can be easily determined.

Further, in the bonding optical element 10, the bonding layer 15 is formed in a film shape. Therefore, according to this configuration, it is possible to make refraction and reflection less likely to occur as compared with the case where a bonding layer having a thickness thicker than that of a film is formed. Further, it can contribute to the thinning of the junction optical element 10.

Further, in the method for manufacturing the bonding layer 15, ultraviolet UV rays are applied to the adhesive 20 with an illuminance distribution 112 (see FIGS. 19 and 20) corresponding to the shape of the refractive index distribution 114. Therefore, according to this configuration, the blazed type refraction intended by the designer or the like is compared with the case where the adhesive 20 is irradiated with ultraviolet rays with an illuminance distribution having a shape completely unrelated to the shape of the refractive index distribution 114. The rate distribution 114 can be easily made.

Further, in the method for manufacturing the bonding layer 15, in the main curing step, the illuminance of the ultraviolet UV is uniformly distributed from the center in the plan view of the bonding layer 15 to the outside as the distribution of the illuminance of the ultraviolet UV applied to the adhesive 20. The illuminance distribution 113 is used. Therefore, according to this configuration, the control content of irradiating the adhesive 20 with ultraviolet UV is simplified as compared with the case where the adhesive 20 is irradiated with ultraviolet UV according to a distribution having a shape more complicated than the illuminance distribution 113. Can be transformed into.

In the above embodiment, as the distribution of the illuminance of the ultraviolet UV irradiated to the adhesive 20 in the main curing step, the illuminance of the ultraviolet UV is uniformly distributed from the center in the plan view of the bonding layer 15 to the outside. Although the embodiment using the illuminance distribution 113 has been described, the technique of the present disclosure is not limited to this. For example, as shown in FIG. 24, in the main curing step, the ultraviolet UV is applied to the adhesive 20 according to the illuminance distribution 115 in which the illuminance distribution of the ultraviolet UV is opposite to the irradiation distribution 112 used in the concentration distribution forming step. It may be irradiated against it. In this case, the adhesive filled between the plano-concave lens 13 and the plano-convex lens 14 in the main curing step is compared with the case where ultraviolet UV rays are applied to the adhesive 20 according to the illuminance distribution 113 in the main curing step. Of the 20 parts, the portion that has not yet been polymerized can be efficiently irradiated with ultraviolet UV rays.

Further, in the above embodiment, the distribution of the concentrations of the first adhesive 20A and the second adhesive 20B on the concave surface 13A (for example, substantially the distribution of the concentrations of the first monomer 23A and the second monomer 23B). ), The technique of the present disclosure is not limited to this, although the embodiment in which the ultraviolet UV is irradiated to the adhesive 20 according to the illuminance distribution 112 in which the illuminance distribution is fixed has been described. For example, as shown in FIG. 25, ultraviolet UV rays are applied to the adhesive 20 according to the illuminance distribution 116 in which the illuminance distribution 112 is deformed according to the distribution of the concentrations of the first adhesive 20A and the second adhesive 20B on the concave surface 13A. It may be irradiated against it. The distribution of the concentrations of the first adhesive 20A and the second adhesive 20B on the concave surface 13A is a distribution derived in advance by, for example, a test and / or a computer simulation.

Further, the concentration change rate of the first adhesive 20A and the second adhesive 20B on the concave surface 13A is constant in the initial state, but changes as the reaction progresses. Therefore, the change mode of the reaction rates of the first adhesive 20A and the second adhesive 20B on the concave surface 13A due to the irradiation of ultraviolet UV is grasped in advance by a test and / or a computer simulation or the like, and on the concave surface 13A. The illuminance distribution 116 may be deformed over time according to the mode of change in the reaction rates of the first adhesive 20A and the second adhesive 20B over time.

As described above, in the example shown in FIG. 25, the ultraviolet UV is an adhesive according to the illuminance distribution 116 in which the illuminance distribution 112 is deformed according to the distribution of the concentrations of the first adhesive 20A and the second adhesive 20B on the concave surface 13A. 20 is irradiated. Therefore, according to this configuration, a highly accurate refractive index distribution 114 can be obtained as compared with the case where the distribution of the concentrations of the first adhesive 20A and the second adhesive 20B on the concave surface 13A is not considered at all. ..

Further, in the example shown in FIG. 25, the illuminance distribution 116 is deformed over time according to the change mode of the concentration distributions of the first adhesive 20A and the second adhesive 20B on the concave surface 13A. Therefore, according to this configuration, a highly accurate refractive index distribution 114 can be obtained as compared with the case where the distribution of the concentrations of the first adhesive 20A and the second adhesive 20B on the concave surface 13A is not considered at all. ..

Further, in the above embodiment, an example of a form in which ultraviolet UV rays are irradiated from the concave surface 13A side (see FIG. 10) has been described, but the technique of the present disclosure is not limited to this. For example, ultraviolet UV may be irradiated from the convex surface 14A side.

Further, in the above embodiment, the ultraviolet curable resin 21 (see FIG. 10) is exemplified, but the technique of the present disclosure is not limited to this. For example, it may be a photo-curing resin that cures in response to light having a wavelength different from that of ultraviolet rays, or it may be a heat-curing resin, and energy given from the outside (for example, light energy and / or heat energy, etc.) may be used. ) Can be used as long as it is a cured resin that cures by reacting with).

Further, in the above embodiment, a pair of lenses is applied to the junction optical element 10, but the technique of the present disclosure is not limited to this, and any optical element that transmits light is an optical element other than the lens. You may.

Further, in the above embodiment, the junction optical element 10 has been described, but the technique of the present disclosure is not limited to this, and the technique of the present disclosure may be applied to an intraocular lens. As shown in FIG. 26 as an example, the diffractive multifocal intraocular lens 198, which is an example of the “intraocular lens” according to the technique of the present disclosure, is incorporated in the eyeball 200 (hereinafter, also referred to as “intraocular”). Used for. For example, the diffractive multifocal intraocular lens 198 is implanted in the eye in place of the crystalline lens that is clouded by cataracts. In the example shown in FIG. 26, a diffractive multifocal intraocular lens 198 is arranged in place of the crystalline lens, and the diffractive multifocal intraocular lens 198 is fixed in the eye by a fixing member 99. The fixing member 99 is, for example, an arc-shaped elastic member, and supports and fixes the diffractive multifocal intraocular lens 198 from the outer peripheral side of the diffractive multifocal intraocular lens 198. The diffractive multifocal intraocular lens 198 includes a first lens 198A and a second lens 198B. The first lens 198A is arranged on the cornea 202 side, and the second lens 198B is arranged on the retina 204 side. A bonding layer 198C corresponding to the bonding layer 15 described in the above embodiment is interposed between the first lens 198A and the second lens 198B, and the bonding layer 198C is the first lens 198A and the second lens 198B. And are joined.

As described above, by applying the bonding layer 198C corresponding to the bonding layer 15 described in the above embodiment to the diffractive multifocal intraocular lens 198, the diffractive multifocal intraocular lens 198 is also described in the above embodiment. The same effect as that of the junction optical element 10 described in the above can be obtained.

Although the morphological example in which the diffractive multifocal intraocular lens 198 is embedded in the eye and used is described here, the technique of the present disclosure is not limited to this. For example, a diffractive multifocal intraocular lens 198 may be applied to the eye model 250.

The eyeball model 250 is an eyeball model used in an experimental stage for manufacturing a device (for example, an ophthalmic observation device or an ophthalmic laser treatment device) used for diagnosis or treatment of diabetic retinopathy or retinal detachment. It may be an eyeball model used for skill training for medical students or doctors to perform various ophthalmic operations or various examinations.

Further, as shown in FIG. 27 as an example, the technique of the present disclosure may be applied to the contact lens 206 used for the eyeball 200. The contact lens 206 is a film-shaped resin lens corresponding to the bonding layer 15 described in the above embodiment, and is used in contact with the cornea 202. In this case as well, the same effect as that of the junction optical element 10 described in the above embodiment can be obtained for the contact lens 206.

It should be noted that the technique of the present disclosure can be appropriately combined with the above-described embodiment and various modified examples. Further, it is of course not limited to the above embodiment, and various configurations can be adopted as long as they do not deviate from the gist.

The description and illustrations shown above are detailed explanations of the parts related to the technology of the present disclosure, and are merely examples of the technology of the present disclosure. For example, the description of the configuration, function, action, and effect described above is an example of the configuration, function, action, and effect of a portion of the art of the present disclosure. Therefore, unnecessary parts may be deleted, new elements may be added, or replacements may be made to the contents described above and the contents shown above within a range not deviating from the gist of the technique of the present disclosure. Needless to say. In addition, in order to avoid complications and facilitate understanding of the parts relating to the technology of the present disclosure, the contents described above and the contents shown above require special explanation in order to enable the implementation of the technology of the present disclosure. Explanations regarding common technical knowledge, etc. are omitted.

In the present specification, "A and / or B" is synonymous with "at least one of A and B". That is, "A and / or B" means that it may be only A, it may be only B, or it may be a combination of A and B. Further, in the present specification, when three or more matters are connected and expressed by "and / or", the same concept as "A and / or B" is applied.

All documents, patent applications and technical standards described herein are to the same extent as if it were specifically and individually stated that the individual documents, patent applications and technical standards are incorporated by reference. Incorporated by reference in the book.

Claims

It is a transmission type diffractive optical element.
It comprises a layer in which a refractive index distribution is formed by the concentration ratio of at least two materials.
The refractive index distribution is a transmission type diffraction optical element which is a blazed distribution from the center of the transmission type diffraction optical element toward the outside.
The transmissive diffractive optical element according to claim 1, wherein the refractive index of one of the two materials is higher than the refractive index of the other material.
The transmissive diffractive optical element according to claim 2, wherein the wavelength dispersion of the one material is lower than the wavelength dispersion of the other material.
The two materials are two types of curable resins that cure by reacting with energy given from the outside.
The transmissive diffractive optical element according to any one of claims 1 to 3, wherein the two types of cured resins are cured resins having different reaction rates to the energy.
The transmissive diffractive optical element according to claim 4, wherein the at least two materials include first inorganic nanoparticles that react with one of the two types of curable resins.
The transmissive diffractive optical element according to claim 5, wherein the first inorganic nanoparticles are nanoparticles having the same reactive group as the one cured resin surface-modified.
The transmissive diffractive optical element according to claim 5 or 6, wherein the at least two materials include second inorganic nanoparticles that react with the other cured resin of the two types of cured resins.
The transmissive diffractive optical element according to claim 7, wherein the second inorganic nanoparticles are nanoparticles having the same reactive group as the other cured resin surface-modified.
The refractive index distribution of the blazed type is
The first refractive index change range in which the refractive index changes at the first rate of change, and
The invention according to any one of claims 1 to 8, which is a distribution in which the second refractive index change range in which the refractive index changes at a second rate of change larger than the first rate of change is alternately connected. Transmission type diffractive optical element.
The transmissive diffractive optical element according to claim 9, wherein the second rate of change is a rate of change in the direction opposite to the first rate of change.
The transmissive diffractive optical element according to claim 9, wherein the refractive index in the second refractive index change range changes from the center toward the outside at the second rate of change.
The refractive index distribution of the blazed type is
The first refractive index change range in which the refractive index changes at the first rate of change, and
It is a distribution in which the second refractive index change range in which the refractive index changes at a second rate of change larger than the first rate of change is alternately connected.
In the refractive index distribution,
The minimum refractive index is Na,
The maximum refractive index is Nb, and
Let t be the change width of the second refractive index change range.
When the thickness of the layer is h,
The transmissive diffractive optical element according to any one of claims 1 to 11, wherein the inequality of h <t · tan θc and the equation of θc = asin (Na / Nb) are satisfied.
The transmissive diffractive optical element according to any one of claims 1 to 12, wherein the layer is formed in a film shape by the at least two materials.
The transmission type diffractive optical element according to any one of claims 1 to 13.
With at least one optical element,
The transmission type diffractive optical element is a bonded optical element bonded to the at least one optical element.
An intraocular lens that is embedded in the eye
The transmission type diffractive optical element according to any one of claims 1 to 13.
With the first lens
With a second lens,
The transmissive diffractive optical element is an intraocular lens that is a junction layer between the first lens and the second lens.
A contact lens that comes into contact with the cornea
A contact lens comprising the transmissive diffractive optical element according to any one of claims 1 to 13.
It is a transmission type diffractive optical element.
It comprises a layer in which a refractive index distribution is formed by the concentration ratio of at least two materials.
The refractive index distribution includes a first refractive index change range in which the refractive index changes at the first rate of change, and a second refractive index in which the refractive index changes at a second rate of change larger than the first rate of change. A transmissive diffractive optical element that has a distribution in which the rate change range is alternately connected.
Applying a solution with at least two materials to a predetermined surface, and
A method for manufacturing a transmission type diffractive optical element, which comprises curing the at least two materials to form a layer in which a refractive index distribution based on the concentration ratio of the at least two materials is formed in a blazed shape.
The two materials are two types of curable resins that cure by reacting with energy given from the outside.
The two types of cured resins are cured resins having different reaction rates to the energy.
The method for manufacturing a transmission type diffractive optical element according to claim 18, wherein the energy is applied to the at least two materials with an energy distribution corresponding to the shape of the refractive index distribution.
The method for manufacturing a transmission type diffraction optical element according to claim 19, wherein the energy distribution is a distribution obtained by deforming a blazed reference energy distribution according to the distribution of concentrations of at least two materials.
The method for manufacturing a transmission type diffractive optical element according to claim 19, which comprises applying the energy to the at least two materials while changing the energy distribution.
Any one of claims 19 to 21, which comprises applying the energy to the at least two materials in the energy distribution and then applying the energy to the at least two materials in a uniform distribution. The method for manufacturing a transmission type diffractive optical element according to the above item.
19. Claims 19 to claim that the energy distribution comprises applying the energy to the at least two materials and then applying the energy to the at least two materials in a distribution opposite to the energy distribution. 21. The method for manufacturing a transmission type diffractive optical element according to any one of items.
The refractive index distribution of the blazed type is
The first refractive index change range in which the refractive index changes at the first rate of change, and
It is a distribution in which the second refractive index change range in which the refractive index changes at a second rate of change larger than the first rate of change is alternately connected.
In the refractive index distribution,
The minimum refractive index is Na,
The maximum refractive index is Nb, and
Let t be the change width of the second refractive index change range.
When the thickness of the layer is h,
The transmissive diffractive optics according to any one of claims 18 to 23, which comprises forming the layer in which the inequality of h <t · tan θc and the equation of θc = asin (Na / Nb) are satisfied. Manufacturing method of the element.