WO2021131874A1 - 眼鏡レンズ - Google Patents
眼鏡レンズ Download PDFInfo
- Publication number
- WO2021131874A1 WO2021131874A1 PCT/JP2020/046628 JP2020046628W WO2021131874A1 WO 2021131874 A1 WO2021131874 A1 WO 2021131874A1 JP 2020046628 W JP2020046628 W JP 2020046628W WO 2021131874 A1 WO2021131874 A1 WO 2021131874A1
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- WIPO (PCT)
- Prior art keywords
- base material
- convex portion
- coating
- spectacle lens
- lens
- Prior art date
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/022—Ophthalmic lenses having special refractive features achieved by special materials or material structures
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C2202/00—Generic optical aspects applicable to one or more of the subgroups of G02C7/00
- G02C2202/24—Myopia progression prevention
Definitions
- the present invention relates to a spectacle lens.
- Patent Document 1 describes a spectacle lens that suppresses the progression of refractive errors such as myopia.
- a spherical minute convex portion (convex portion of the base material in the present specification) having a diameter of about 1 mm is formed on the convex surface which is the surface of the spectacle lens on the object side.
- a light ray incident from a surface on the object side is usually emitted from a surface on the eyeball side to focus on the retina of the wearer (predetermined position A in the present specification).
- the light ray passing through the minute convex portion focuses the light ray incident on the spectacle lens at the position B closer to the object side than the predetermined position A.
- the progression of myopia is suppressed.
- An embodiment of the present invention aims to provide a technique capable of sufficiently exerting a myopia suppressing effect even after forming a film on a lens base material.
- the present inventor has made diligent studies to solve the above problems.
- the coating covers the surface having the convex portion of the base material. Then, the outermost surface shape of the coating film has a coating film convex portion derived from the base material convex portion.
- the present inventor came up with the following method. It was found that when the shape of the convex portion on the outermost surface of the spectacle lens is an approximate shape of the convex portion of the base material, the effect of suppressing myopia can be sufficiently exerted.
- the convex shape of the base material that is, the partial spherical shape
- the convex shape of the base material is virtualized from the actual convex shape of the coating film. It was found that when the difference between the virtual partial spherical shape and the actual coating convex shape remains at a predetermined value, the myopia suppression effect can be further exerted.
- the present invention has been devised based on the above findings.
- the first aspect of the present invention is In a spectacle lens that emits light rays incident from a surface on the object side from a surface on the eyeball side and converges them at a predetermined position A.
- a lens base material having a plurality of base material convex portions on at least one of the surface on the object side and the surface on the eyeball side.
- a coating film covering the surface having the convex portion of the base material is provided.
- the shape of the coating convex portion on the outermost surface of the spectacle lens on the side having the base material convex portion is a base material that converges the light rays incident on the spectacle lens to the position B closer to the object side than the predetermined position A. It is a spectacle lens that has a convex shape.
- the second aspect of the present invention is the aspect described in the first aspect.
- a large number of light rays obtained by ray tracing calculation that are evenly incident within a predetermined range of the surface of the spectacle lens on the object side and pass through the coating film, they do not pass near the predetermined position A and do not pass near the predetermined position A.
- the number of stray light rays that do not pass near the position B near the object side is 30% or less of the number of incident light rays.
- the fourth aspect of the present invention is the aspect described in the first to third aspects.
- a spectacle lens in which the maximum absolute value of the difference in the lens thickness direction between the spherical surface optimally approximated to the convex portion shape of the coating and the actual convex shape of the coating is 0.1 ⁇ m or less. ..
- a fifth aspect of the present invention is the aspect described in any one of the first to fourth aspects.
- the relationship between the protruding distance L c of the convex portion of the coating film and the protruding distance L l of the convex portion of the base material satisfies the following equation (1). 0.6 ⁇ L c / L l ⁇ 1.5 ... Equation (1)
- the convex portion of the coating converges the light rays incident on the spectacle lens to the position B which is closer to the object side than the predetermined position A within a range of more than 0 mm and 10 mm or less.
- the film has a ⁇ / 4 film in contact with the lens substrate, a hard coat film formed on the ⁇ / 4 film, and an antireflection film formed on the hard coat film.
- the refractive index of the lens base material is higher than that of the ⁇ / 4 film, and the refractive index of the ⁇ / 4 film is higher than that of the hard coat film.
- the maximum value of the absolute value of the difference in the lens thickness direction between the spherical surface optimally approximated to the convex portion shape of the coating and the actual convex shape of the coating is preferable. It is 0.06 ⁇ m or less.
- the outermost surface of the spectacle lens (that is, the outermost surface of the coating film) has a shape that converges the light rays incident on the spectacle lens to the position B which is closer to the object side than the predetermined position A within a range of more than 0 mm and 10 mm or less. ..
- the range is preferably 0.1 to 7 mm, more preferably 0.1 to 5 mm, and even more preferably 0.3 to 3 mm.
- Yet another aspect of the present invention is in a spectacle lens that emits light rays incident from a surface on the object side from a surface on the eyeball side and converges them at a predetermined position A.
- a lens base material having a plurality of base material convex portions on at least one of the surface on the object side and the surface on the eyeball side is provided.
- the spectacle lens has a configuration that suppresses the generation of stray light rays that do not pass near the predetermined position A and do not pass near the position B closer to the object than the predetermined position A.
- Yet another aspect of the present invention is in a spectacle lens that emits light rays incident from a surface on the object side from a surface on the eyeball side and converges them at a predetermined position A.
- a lens base material having a plurality of base material convex portions on at least one of the surface on the object side and the surface on the eyeball side.
- a coating film covering the surface having the convex portion of the base material is provided.
- the coating is a spectacle lens having a thickness of 3.0 ⁇ m or less.
- Yet another aspect of the present invention is in a spectacle lens that emits light rays incident from a surface on the object side from a surface on the eyeball side and converges them at a predetermined position A.
- a lens base material having a plurality of base material convex portions on at least one of the surface on the object side and the surface on the eyeball side.
- a coating film covering the surface having the convex portion of the base material is provided.
- the convex portion on the outermost surface of the spectacle lens on the side having the convex portion of the base material and the convex portion of the base material are spectacle lenses having common light ray focusing characteristics.
- FIG. 1 is a cross-sectional view showing an example of an spectacle lens according to an aspect of the present invention.
- FIG. 2 shows that the spectacle lens according to one aspect of the present invention emits light rays incident from the surface on the object side from the surface on the eyeball side by a portion other than the convex portion of the coating (that is, the base portion) on the retina of the eyeball. It is a schematic side sectional view which shows the state of converging to a predetermined position A.
- FIG. 3 shows that the spectacle lens according to one aspect of the present invention emits light rays incident from the surface on the object side from the surface on the eyeball side by the convex portion of the coating and converges on the position B closer to the object side than the predetermined position A.
- FIG. 4 is a schematic cross-sectional view showing a convex portion of the coating of an actual spectacle lens and a virtual partial spherical shape.
- FIG. 5 is a flowchart showing a flow of an inspection method for an spectacle lens according to one aspect of the present invention.
- FIG. 6 is a diagram (No. 1) for explaining a method of specifying a position where a light beam is focused.
- FIG. 7 is a diagram (No. 2) for explaining a method of specifying the position where the light beam is focused.
- FIG. 8 is a diagram (No. 3) for explaining a method of specifying the position where the light beam is focused.
- FIG. 1 is a diagram (No. 1) for explaining a method of specifying a position where a light beam is focused.
- FIG. 7 is a diagram (No. 2) for explaining a method of specifying the position where the light beam is focused.
- FIG. 8 is a diagram (No. 3) for explaining a method of specifying the position where the light beam
- FIG. 10 is a design value (that is, without a coating) and passes through the apex of the base material convex portion (that is, the center of the base material convex portion in a plan view) in the astigmatism distribution with respect to the base material convex portion and its vicinity. It is a figure which shows the plot (solid line) of the astigmatism distribution (that is, the astigmatism cross-section curve) in the cross section.
- FIG. 10 is a design value (that is, without a coating) and passes through the apex of the base material convex portion (that is, the center of the base material convex portion in a plan view) in the astigmatism distribution with respect to the base material convex portion and its vicinity. It is a figure which shows the plot (solid line) of the astigmatism distribution (that is, the astigmatism cross-section curve) in the cross section.
- FIG. 11 shows an astigmatism distribution (that is, astigmatism distribution) in a cross section passing through the apex of the coating convex portion (that is, the center of the coating convex portion in a plan view) in the astigmatism distribution with respect to the actual coating convex portion and its vicinity. It is a figure which shows the plot (solid line) of the abduction cross section curve).
- FIG. 12A is a schematic cross-sectional view showing a convex portion of the coating and a convex portion of the base material of an actual spectacle lens.
- FIG. 12B is a schematic cross-sectional view in which the apex of the convex portion of the coating and the apex of the convex portion of the base material are matched.
- FIG. 13 shows the defocus power (vertical) calculated from the value obtained by subtracting the surface refractive power of the base material base portion from the surface refractive power of the convex portion of the base material (horizontal axis) and the reciprocal of the focusing position. It is a plot which shows the correlation equation with (axis).
- FIG. 14A shows a case where independent discrete arrangement (the center of each coating convex portion is arranged at the apex of the honeycomb structure) is adopted so that the center of each coating convex portion becomes the apex of an equilateral triangle in a plan view.
- FIG. 14 (b) is a view when a structure in which the convex portions of the coating film are arranged in a row is adopted in a plan view.
- the spectacle lens 1 has a surface 3 on the object side and a surface 4 on the eyeball side.
- the "object-side surface 3" is a surface located on the object side (front side in the Z direction, front side) when the spectacles provided with the spectacle lens 1 are worn by the wearer, and is the "eyeball-side surface 4". Is the opposite, that is, the surface located on the eyeball side (rear side in the Z direction, back side) when the spectacles provided with the spectacle lens 1 are worn by the wearer.
- the left-right (horizontal) direction when the spectacle lens is viewed from the front is the X direction
- the vertical direction is the Y direction
- the lens thickness direction and the optical axis direction are the Z directions.
- the base portion of the lens base material 2 excluding the minute convex portion described in Patent Document 1 that is, the base material convex portion 6 described later and the coating convex portion 11 on the base material convex portion 11
- the base portion (base material base portion) and the base portion (coating base portion) on the outermost surface thereof are predetermined by emitting light rays incident from the surface 3 on the object side from the surface 4 on the eyeball side, as in the conventional spectacle lens 1. It has a function of converging to the position A (that is, a function of realizing a prescription frequency).
- Convergence as used herein means to converge in at least one of the vertical direction and the horizontal direction.
- FIG. 2 shows that the spectacle lens 1 according to one aspect of the present invention emits light rays incident from the surface 3 on the object side from the surface 4 on the eyeball side by a portion other than the convex portion 11 (that is, the coating base portion). It is a schematic side sectional view which shows how the eyeball 20 converges to a predetermined position A on the retina 20A.
- the spectacle lens 1 includes a lens base material 2.
- the lens base material 2 also has a surface 3 on the object side and a surface 4 on the eyeball side.
- the shape of both sides of the lens base material 2 may be determined according to the type of the spectacle lens 1, and may be any of a convex surface, a concave surface, a flat surface, or a combination thereof.
- a plurality of base material convex portions 6 are formed on at least one of the surface 3 on the object side and the surface 4 on the eyeball side.
- the film convex portion 11 is a spectacle lens 1. The light beam incident on the lens is converged to the position B closer to the object side than the predetermined position A.
- the shape of the convex portion (eg, the convex portion 11 of the coating film) on the outermost surface of the spectacle lens on the side having the convex portion 6 of the base material causes the light beam incident on the spectacle lens to be positioned at the predetermined position. It is an approximate shape of the convex portion of the base material that converges to the position B closer to the object side than A.
- the base material convex portion approximate shape refers to a shape in which the spherical surface (hereinafter referred to as a virtual partial spherical shape) optimally approximated to the coating convex portion 11 shape and the base material convex portion 6 shape are approximated.
- a spherical surface that is optimally approximated to the substantially spherical shape of the apex of the convex portion 11 of the coating is virtualized.
- a virtual partial spherical shape is obtained.
- the virtual partial spherical shape and the actual coating convex portion 11 shape are compared.
- FIG. 4 is a schematic cross-sectional view showing the coating convex portion 11 of the actual spectacle lens 1 and the virtual partial spherical shape.
- the solid line indicates the actual coating convex portion 11 of the spectacle lens 1
- the broken line indicates the virtual partial spherical shape
- the alternate long and short dash line indicates the actual coating base portion of the spectacle lens 1
- the horizontal line hatch portion indicates the virtual partial spherical shape. The difference in the lens thickness direction from the actual shape of the film convex portion 11 is shown.
- the specifics of the optimum approximation are as follows.
- the spherical shape is arranged so as to overlap the shape of the coating convex portion 11.
- Square. Set a virtual partial spherical shape that minimizes the sum of those values.
- a virtual partial spherical shape may be obtained from the positions of the apex of the coating convex portion 11 and a plurality of points in the vicinity thereof.
- the apex of the virtual partial spherical shape may be matched with the apex of the coating convex portion 11 of the actual spectacle lens 1 and the difference may be examined.
- the coating convex portion 11 is very close to the partially spherical shape. As a result, the effect of suppressing myopia can be fully exerted. Furthermore, by applying this regulation, in addition to being able to fully exert the effect of suppressing myopia, the cross section of the actually produced spectacle lens 1 is purposely exposed, and the convex portion of the coating is the convex shape of the base material. There is no need to confirm whether or not the image is faithfully reflected.
- the standing start portion from the shape of the base portion on the outermost surface, the point where the shape of the coating convex portion 11 is curved and turned to increase in the curve once differentiated may be used as the standing start portion. Further, the rising portion of the peak of the astigmatism cross-sectional curve shown in FIG. 11B, which will be described later, may be used as the rising starting portion.
- the standing end portion may be set in the same manner.
- the number of stray light rays that do not pass near the position B near the object side is set to 30% or less of the number of incident light rays.
- the stray light rate the ratio of the stray light ray
- the stray light ray is a light ray that is incident from the surface 3 on the object side of the spectacle lens 1 and is emitted from the surface 4 on the eyeball side, and does not pass near a predetermined position A where the light ray is converged by the spectacle lens 1 itself. It refers to a light beam that does not pass near the position B where the light beam converges due to the material convex portion 6 and thus the coating convex portion 11. Stray light rays cause blurring in the wearer's field of vision. Therefore, it is preferable to reduce the stray light rate in the light beam incident from the object-side surface 3 of the spectacle lens 1 and emitted from the eyeball-side surface 4.
- the stray light rate exceeds 0% (or 1% or more, and further 3% or more). Moreover, it may be set to 30% or less. Further, since it is preferable to reduce the stray light rate, it is preferably set to 20% or less, and more preferably 15% or less.
- FIG. 5 is a flowchart showing a flow of an inspection method for an spectacle lens according to one aspect of the present invention.
- step 103 an actual model of the spectacle lens 1 is set based on the curved surface data (model setting step).
- the eyeball model may use information related to the wearer (for example, axial length and accommodation amount of the eye).
- the spectacle lens model 30 with respect to the eyeball model 32 may be arranged in consideration of the inclination (forward tilt angle and frame tilt angle) of the spectacle lens when attached to the frame.
- step 104 the position where the light ray converges most when the light ray passes through the actual spectacle lens 1 is specified by the light ray tracing process (convergence position specifying step).
- PSF Point spread function
- FIG. 6 to 8 are diagrams for explaining a method of specifying the position where the light beam is focused.
- FIG. 9 is a flowchart showing a method of specifying a position where the light beam is focused.
- step 201 it is assumed that a light ray passes through the coating convex portion 36 on the model on the surface (convex surface) 33 on the object side on the model. Then, from the 0 mm position on the retina 32A of the eyeball model 32, from a predetermined distance (for example, a position of about 16 mm, which is the thickness of the vitreous body of the eyeball) to the retina 32A, a predetermined separation interval ⁇ d (for example, 0.1 mm). ) Intervals set the measurement surfaces P1,1 to P1, n.
- the separation interval ⁇ d may be 0.2 mm or 1/50 of the axial length.
- step 202 ray tracing processing is performed to calculate the density of light rays on each of the measurement surfaces P1,1 to P1, n.
- a grid-like grid for example, 0.1 mm ⁇ 0.1 mm
- the number of light rays passing through each grid may be calculated.
- step 203 in order to specify the measurement surface at which the light beam incident on the convex portion has the maximum density, the measurement surface having the first maximum density from the predetermined distance among the measurement surfaces P1,1 to P1, n Identify P1 and i.
- the calculation of the ray density was started from the measurement surface P1, and after the first maximum value was detected, the calculated value of the ray density decreased to about the intermediate value between the value on the measurement surface P1 and the first maximum value. By the way, the calculation in this step may be terminated.
- step 204 the measurement surfaces P2 and 1 and the measurement surfaces P2 and 2 are set at positions of the distance ⁇ d / 2 before and after the measurement surfaces P1 and i having the maximum density. Then, in step 205, the density of light rays on the measurement surfaces P2 and 1 and the measurement surfaces P2 and 2 is calculated. Next, in step 206, the measurement surface P2, 1, the measurement surface P2, 2 and the measurement surface having the maximum density on the measurement surface P1, i are specified.
- the number of light rays outside the range of, for example, a radius of 2.5 to 20 ⁇ m is calculated from the convergence position B of the light rays on the measurement surface.
- the range from the convergence position B to, for example, a radius of 2.5 to 20 ⁇ m is defined as the “neighborhood of position B”.
- the number of light rays after being subtracted does not converge near the position A where the light rays converge on the spectacle lens 1 itself, and does not converge near the position B near the object where the light rays converge at the film convex portion 11. ..
- Such light rays are referred to as stray light in the present specification. By setting this stray light rate to 30% or less, the effect of suppressing myopia can be sufficiently exerted even after the film is formed on the lens base material 2.
- the coating convex portion 11 converges the light beam incident on the spectacle lens 1 to the position B which is closer to the object side than the predetermined position A within a range of more than 0 mm and 10 mm or less.
- the outermost surface of the spectacle lens 1 of one aspect of the present invention (that is, the outermost surface of the coating film) causes light rays incident on the spectacle lens 1 to exceed 0 mm and 10 mm or less on the object side of the predetermined position A. It has a shape that converges to the position B that is close to the range of.
- the range is preferably 0.1 to 7 mm, more preferably 0.1 to 5 mm, and even more preferably 0.3 to 3 mm.
- the relationship between the protruding distance L c of the coating convex portion 11 and the protruding distance L l of the base material convex portion 6 satisfies the following formula (1). 0.6 ⁇ L c / L l ⁇ 1.5 ... Equation (1) If this condition is satisfied, even if a film is formed on the convex portion 6 of the base material, the convex portion 11 of the coating derived from the convex portion 6 of the base material sets the convergence position B of the light beam incident on the spectacle lens 1 to the predetermined predetermined position B. It is sufficiently moved toward the object side from the position A. This means that the coating convex portion 11 and thus the spectacle lens 1 of one aspect of the present invention can exert a sufficient myopia suppressing effect.
- the half width of the cross-sectional curve of the astigmatism at the root of the convex portion 11 of the coating in the astigmatism distribution with respect to the outermost surface shape of the coating is 0.20 mm or less.
- the "root of the convex portion of the coating (also referred to as the periphery)" means the boundary between the coating base portion on the outermost surface of the spectacle lens and the convex portion of the coating and the coating base portion in the vicinity thereof, and astigmatism suddenly increases. It refers to the part that begins to grow.
- Astigmatism (cross-sectional curve) in cross-sectional view with a spectacle lens can be measured by a technique called coherence correlation interference measurement.
- a substantially annular region separated from the boundary by 0.2 times the distance between the center and the boundary in the direction away from the center of the convex portion in the plan view may be used as the root of the convex portion of the coating.
- FIG. 10 shows design values (that is, no coating), and is the apex of the base material convex portion 6 (that is, the center of the base material convex portion 6 in a plan view) in the astigmatism distribution with respect to the base material convex portion 6 and its vicinity. It is a figure which shows the plot (solid line) of the astigmatism distribution (that is, the astigmatism cross-section curve) in the cross section passing through).
- FIG. 10 shows design values (that is, no coating), and is the apex of the base material convex portion 6 (that is, the center of the base material convex portion 6 in a plan view) in the astigmatism distribution with respect to the base material convex portion 6 and its vicinity. It is a figure which shows the plot (solid line) of the astigmatism distribution (that is, the astigmatism cross-section curve) in the cross section passing through).
- the astigmatism distribution that is, the astigmatism distribution in the cross section passing through the apex of the coating convex portion 11 (that is, the center of the coating convex portion in a plan view) in the astigmatism distribution with respect to the actual coating convex portion 11 and its vicinity. It is a figure which shows the plot (solid line) of the astigmatism cross section curve).
- the horizontal axis indicates the X-axis, that is, the horizontal position when the surface 3 of the spectacle lens 1 on the object side is viewed in a plane, and the unit is mm.
- the Y-axis that is, the vertical (top-bottom) direction when the surface 3 on the object side of the spectacle lens 1 is viewed in a plan view may be used.
- the left vertical axis shows the value of astigmatism (and average frequency), and the unit is diopter.
- the right vertical axis indicates the height of the coating convex portion 11 or the base material convex portion 6, and the unit is mm.
- the convex portion 11 of the coating film or the convex portion 6 of the base material is a portion of 0.3 to 1.3 mm on the horizontal axis.
- a plot (dotted line) of the average frequency distribution that is, the average frequency distribution cross-sectional curve
- a plot (broken line) of the height of the Z-axis of the coating convex portion 11 or the base material convex portion 6 are also shown.
- One of the causes of the stray light beam is that the shape of the convex portion 11 of the coating changes too slowly from the base portion of the coating. That is, if the coating base portion and the coating convex portion 11 are clearly separated, one of the causes of the stray light rays can be eliminated, and by extension, the myopia suppression effect is sufficiently exhibited even after the coating is formed on the lens base material 2. It will be possible. Therefore, the astigmatism cross-sectional curve is used to show that there is not much a half-shaped portion that is one of the causes of the stray light beam between the coating base portion and the coating convex portion 11. That is, the degree of change in the shape of the root of the convex portion 11 of the coating (that is, the change in the arrangement of the coating) is defined by the astigmatism cross-sectional curve with respect to the convex portion 11 of the coating.
- the peak width at the half-value of the peak apex value may be adopted.
- the spectacle lens 1 of one aspect of the present invention is abruptly changed from the base portion to the coating convex portion 11. However, it can exert a sufficient effect of suppressing myopia.
- the film is a ⁇ / 4 film (not shown) in contact with the lens base material 2, a hard coat film 8 formed on the ⁇ / 4 film, and a reflection formed on the hard coat film 8. It is preferable to have the prevention film 10.
- the ⁇ / 4 film is not particularly limited as long as it is a film optically having a thickness of ⁇ / 4, and a film used for an antireflection filter or the like may be used.
- the thickness may be 70 to 90 nm.
- the hard coat film 8 is not particularly limited as long as it improves the scratch resistance of the spectacle lens 1.
- a known antireflection film 10 may be used.
- the refractive index of the lens base material 2 is higher than that of the ⁇ / 4 film, and the refractive index of the ⁇ / 4 film is higher than that of the hard coat film 8.
- the size of the base material convex portion 6 and the mode of arrangement of the plurality of base material convex portions 6 on the surface of the lens base material 2 are not particularly limited.
- There is no limitation on the protrusion of the base material as long as it can mainly take the action of emitting the luminous flux incident from the surface on the object side from the surface on the eyeball side and converging it on the object side (front) of the retina.
- the size of the base material protrusion is not limited, and may be any size or shape that causes uneven distribution of the thickness of the coating film formed at the base of the base material protrusion.
- it may be circular in a plan view, or may be spherical as a three-dimensional shape. It may have an elliptical shape in a plan view, or may have a toric shape as a three-dimensional shape. This also applies to the shape of the convex portion of the coating.
- FIG. 14A shows a case where independent discrete arrangement (the center of each coating convex portion is arranged at the apex of the honeycomb structure) is adopted so that the center of each coating convex portion becomes the apex of an equilateral triangle in a plan view.
- FIG. 14 (b) is a view when a structure in which the convex portions of the coating film are arranged in a row is adopted in a plan view.
- the dotted line is an arbitrary circular area used when measuring the stray light rate (details will be described later).
- each base material is arranged independently so that the center of each base material protrusion is the apex of an equilateral triangle (each base material is placed at the apex of the honeycomb structure). (The center of the protruding portion is arranged) may be adopted.
- a structure in which the protrusions of the base materials are arranged in a row may be adopted in a plan view. Further, it is possible to adopt a structure in which each base material protrusion is arranged in a row and another base material protrusion is arranged adjacent to the row.
- the pitch between the base material protrusions in one row (distance between the centers of the base material protrusions, the same applies hereinafter), the base material protrusions in one row, and another row adjacent to the base material protrusions.
- the pitch between the base material and the protrusion of the base material may be different.
- the distance between the base material protrusions in one row and the distance between adjacent rows may be different.
- the height of the base material convex portion 6 may be, for example, 0.1 to 10 ⁇ m, or 0.5 to 2 ⁇ m (corresponding to the refractive power of 2.50 to 6.50 D of the base material protruding portion).
- the upper limit of the refractive power of the protrusion of the base material may be 5.50D or 5.00D, and the lower limit may be 3.00D.
- the radius of curvature of the surface of the convex portion 6 of the base material may be, for example, 50 to 250 mmR.
- the distance between the adjacent base material convex portions 6 is, for example, the base material convex portion. It may be about the same as the value of the radius of the part 6.
- the plurality of base material convex portions 6 can be arranged substantially uniformly, for example, in the vicinity of the center of the lens.
- a base material protruding portion may be formed in the central portion of the spectacle lens, or as shown in FIG. 1 of Patent Document 1, a base material may be formed in the central portion of the spectacle lens. It is not necessary to form a protrusion.
- the lens base material 2 may be, for example, a plastic lens base material or a glass lens base material.
- the glass lens base material may be, for example, a lens base material made of inorganic glass.
- a plastic lens base material is preferable from the viewpoint of being lightweight and hard to break.
- the plastic lens base material include styrene resins such as (meth) acrylic resins, polycarbonate resins, allyl resins, allyl carbonate resins such as diethylene glycol bisallyl carbonate resin (CR-39), vinyl resins, polyester resins, and polyether resins.
- Urethane resin obtained by reacting an isocyanate compound with a hydroxy compound such as diethylene glycol a thiourethane resin obtained by reacting an isocyanate compound with a polythiol compound, and a (thio) epoxy compound having one or more disulfide bonds in the molecule.
- a cured product generally referred to as a transparent resin
- the curable composition may be referred to as a polymerizable composition.
- an undyed lens colorless lens
- a dyed lens (dyed lens) may be used.
- a lens base material 2 having a base material convex portion 6 on at least one surface can be obtained. Be done.
- One aspect of the coating film formed on the surface of the lens base material 2 having the base material convex portion 6 is a cured film formed by curing a curable composition containing a curable compound.
- a curable composition containing a curable compound is generally called a hard coat film 8 and contributes to improving the durability of the spectacle lens 1.
- the curable compound means a compound having a curable functional group
- the curable composition means a composition containing one or more curable compounds.
- a curable composition containing an organosilicon compound as a curable compound can be mentioned, and a curable composition containing metal oxide particles together with the organosilicon compound can be mentioned.
- a curable composition capable of forming the cured film there is a curable composition described in JP-A-63-10640.
- organosilicon compound represented by the following general formula (I) and a hydrolyzate thereof can also be mentioned.
- R 1 represents an organic group having a glycidoxy group, an epoxy group, a vinyl group, a methacryloxy group, an acrylicoxy group, a mercapto group, an amino group, a phenyl group and the like
- R 2 has 1 carbon number. It represents an alkyl group of to 4 and an acyl group of 1 to 4 carbon atoms or an aryl group of 6 to 10 carbon atoms
- R 3 represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms.
- b represent 0 or 1, respectively.
- Alkyl group having 1 to 4 carbon atoms represented by R 2 is a linear or branched alkyl group. Specific examples include a methyl group, an ethyl group, a propyl group, a butyl group.
- the alkyl group having 1 to 6 carbon atoms represented by R 3 is a linear or branched alkyl group, and specific examples thereof include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group. Can be mentioned.
- Examples of the aryl group having 6 to 10 carbon atoms represented by R 3 include a phenyl group, a xsilyl group, a tolyl group and the like.
- Specific examples of the compound represented by the general formula (I) include the compounds described in paragraph 0073 of JP-A-2007-07737. Since the organosilicon compound represented by the general formula (I) has a curable group, the hard coat film 8 can be formed as a cured film by performing a curing treatment after coating.
- the metal oxide particles can contribute to adjusting the refractive index and improving the hardness of the cured film.
- Specific examples of the metal oxide particles include tungsten oxide (WO 3 ), zinc oxide (ZnO), silicon oxide (SiO 2 ), aluminum oxide (Al 2 O 3 ), titanium oxide (TiO 2 ), and zirconium oxide (ZrO). 2 ), particles such as tin oxide (SnO 2 ), beryllium oxide (BeO), and antimony oxide (Sb 2 O 5 ) can be mentioned, and can be used alone or in combination of two or more kinds of metal oxide particles.
- the particle size of the metal oxide particles is preferably in the range of 5 to 30 nm from the viewpoint of achieving both scratch resistance and optical properties of the cured film.
- the content of the metal oxide particles of the curable composition can be appropriately set in consideration of the refractive index and hardness of the cured film to be formed, and is usually about 5 to 80% by mass per solid content of the curable composition. May be. Further, the metal oxide particles are preferably colloidal particles from the viewpoint of dispersibility in the cured film.
- the cured film is a curable composition prepared by mixing, for example, the above components and, if necessary, an optional component such as an organic solvent, a surfactant (leveling agent), and a curing agent, and is used as a base material for the lens base material 2. It is applied directly to the surface having the convex portion 6 or indirectly applied through another film to form a coating film, and the coating film is subjected to a curing treatment (for example, heating and / or heating) according to the type of the curable compound. Alternatively, it can be formed by applying light irradiation). Details of the application of the curable composition will be described later.
- the lens base material 2 on which the coating film of the curable composition is formed is placed in the coating film in an environment of an atmospheric temperature of 50 to 150 ° C. for about 30 minutes to 2 hours.
- the curing reaction of the curable compound of is allowed to proceed.
- the viscosity of the curable composition for forming a film on the surface of the lens base material 2 having the base material convex portion 6 is in the range of 1 to 50 mPa ⁇ s from the viewpoint of application suitability by spin coating. It is preferably in the range of 1 to 40 mPa ⁇ s, more preferably in the range of 1 to 20 mPa ⁇ s.
- the viscosity in the present invention and the present specification refers to the viscosity at a liquid temperature of 25 ° C.
- a coating film generally called a primer film and contributing to improvement of adhesion between layers
- a coating liquid capable of forming such a film a composition in which a resin component such as a polyurethane resin is dispersed in a solvent (water, an organic solvent, or a mixed solvent thereof) (hereinafter, “dry solidifying composition”). ".) Can be mentioned.
- the solidification of such a composition proceeds by removing the solvent by drying. Drying can be performed by a drying process such as air drying or heat drying.
- the viscosity of the dry-solidifying composition for forming a film on the surface of the lens base material 2 having the base material convex portion 6 is in the range of 1 to 50 mPa ⁇ s from the viewpoint of application suitability by spin coating. Is preferable, the range is more preferably 1 to 40 mPa ⁇ s, and further preferably the range is 1 to 20 mPa ⁇ s.
- the coating liquid for forming a coating film on the surface of the lens base material 2 having the base material convex portion 6 is supplied by spin coating.
- spin coating By applying the coating by spin coating, it is possible to prevent the film thickness from becoming uneven due to the formation of liquid pools around the convex portion 6 of the base material.
- the lens base material 2 is arranged with the surface of the base material convex portion 6 facing vertically upward on the spin coater, and the lens base material 2 is rotated on the spin coater. This can be done by supplying the coating liquid from above (for example, discharging the coating liquid from a nozzle arranged above the surface).
- the rotation speed of the lens base material 2 in the spin coating is preferably in the range of 10 to 3000 rpm (rotations per minute), preferably in the range of 50 to 2500 rpm, from the viewpoint of forming a film having a more uniform film thickness. It is more preferable, and the range of 100 to 2000 rpm is further preferable.
- the present invention is not limited to the spin coating method, and may be realized by using a known method (for example, a dip method).
- a film can be formed by performing a treatment (for example, curing treatment, drying treatment, etc.) according to the type of coating liquid.
- a treatment for example, curing treatment, drying treatment, etc.
- the film thickness of the coating film formed through the above steps may be, for example, in the range of 0.5 to 100 ⁇ m. However, the film thickness of the coating film is determined according to the function required for the coating film, and is not limited to the above-exemplified range.
- the height of the convex portion of the coating film may be, for example, 0.1 to 10 ⁇ m, preferably 0.5 to 2 ⁇ m, as in the case of the protruding portion of the base material.
- the defocus power of the convex portion of the coating film may be 2.50 to 6.50 D of the refractive power of the protruding portion of the base material as well as the protruding portion of the base material.
- the upper limit of the defocus power may be 5.50D or 5.00D, and the lower limit may be 3.00D.
- the term "defocus power” refers to the difference between the refractive power of each defocus region and the refractive power of a portion other than each defocus region.
- the “defocus power” is the difference obtained by subtracting the refractive power of the base portion from the average value of the minimum refractive power and the maximum refractive power of a predetermined portion of the defocus region. In the present specification, a case where the defocus region is a convex region is illustrated.
- the "refractive power" in the present specification is an average value of the refractive power in the direction a in which the refractive power is the minimum and the refractive power in the direction b (perpendicular to the direction a) in which the refractive power is maximum. Refers to the refractive power.
- One or more coatings can be formed on the coating.
- a film examples include various films such as an antireflection film 10, a water-repellent or hydrophilic antifouling film, and an antifogging film.
- Known techniques can be applied to the method of forming these coatings.
- one or more coating films can be formed on the surface of such a lens base material 2.
- examples of such a coating film include various coating films usually provided on the spectacle lens 1 (for example, a hard coat film 8, a primer film, an antireflection film 10, an antifouling film, an antifogging film, etc.), and a method for forming these coating films.
- a known technique can be applied to.
- the maximum value of the absolute value of the difference in the lens thickness direction between the spherical surface optimally approximated to the shape of the convex portion 11 of the coating and the actual shape of the convex portion 11 of the coating is set to 0.
- the thickness is 1 ⁇ m or less
- the spectacle lens 1 according to the present invention is not limited to the regulation of this difference.
- the convex portion on the outermost surface of the spectacle lens 1 on the side having the convex portion 6 of the base material allows the light rays incident on the spectacle lens 1 to be transmitted at a predetermined position even after the film is formed.
- the gist of the present invention is to converge to the position B closer to the object side than A, and this gist is novel.
- the following provisions may be used.
- the number of stray light rays that do not pass near position B is set to 30% or less of the number of incident light rays.
- it has the following structure. "In a spectacle lens that emits a light ray incident from a surface on the object side from a surface on the eyeball side and converges it at a predetermined position A.
- a lens base material having a plurality of base material convex portions on at least one of the surface on the object side and the surface on the eyeball side is provided.
- the "configuration that suppresses the generation of stray light rays” may be related to the shape of the surface 3 on the object side or the surface 4 on the eyeball side of the spectacle lens 1, or may be related to the composition of the lens base material 2 or the coating film. It may be a thing.
- the maximum absolute value of the difference in the lens thickness direction between the actual coating convex shape and the actual base material convex shape is 0.1 ⁇ m or less (preferably 0.06 ⁇ m or less).
- the film convex portion 11 has a blunt shape as compared with the base material convex portion 6, at least the apex portion of the film convex portion 11 is the base material convex portion. It has a shape that follows 6.
- the substantially spherical shape of the actual coating convex portion 11 and the partial spherical shape of the actual lens base material 2 are compared.
- FIG. 12A is a schematic cross-sectional view showing the convex portion 11 of the coating and the convex portion 6 of the base material of the actual spectacle lens 1.
- FIG. 12B is a schematic cross-sectional view in which the apex of the coating convex portion 11 and the apex of the base material convex portion 6 are aligned with each other.
- the solid line indicates the actual coating convex portion 11 of the spectacle lens 1
- the broken line indicates the base material convex portion 6
- the vertical line portion indicates the lens thickness direction between the coating convex portion shape and the base material convex portion shape. Show the difference.
- FIG. 12B after aligning the apex of the coating convex portion 11 with the apex of the base material convex portion 6, the standing starts from the shape of the base portion of the base material convex portion 6 and then stands up toward the apex.
- the difference in the lens thickness direction (optical axis method) between the actual base material convex portion 6 up to the portion where the above is completed and the coating convex portion 11 of the actual spectacle lens 1 is examined.
- the maximum absolute value of this difference is 0.1 ⁇ m or less (preferably 0.06 ⁇ m or less), it is considered that the shape of the base material convex portion 6 existing under the coating film can be faithfully followed. As a result, it has been found that the effect of suppressing myopia can be sufficiently exerted. By applying this regulation, the effect of suppressing myopia can be fully exerted.
- the similarity ratio between the convex portion 11 shape of the coating film and the convex portion 6 shape of the base material may be defined.
- a spectacle lens that emits a light ray incident from a surface on the object side from a surface on the eyeball side and converges it at a predetermined position A.
- a lens base material having a plurality of base material convex portions on at least one of the surface on the object side and the surface on the eyeball side.
- a coating film covering the surface having the convex portion of the base material is provided.
- a spectacle lens having a coating film of 3.0 ⁇ m or less.
- a spectacle lens that emits a light ray incident from a surface on the object side from a surface on the eyeball side and converges it at a predetermined position A.
- a lens base material having a plurality of base material convex portions on at least one of the surface on the object side and the surface on the eyeball side.
- a coating film covering the surface having the convex portion of the base material is provided.
- the spectacle lens 1 according to this other aspect is not limited to the regulation of this difference.
- the purpose of this other aspect is that the convex portion on the outermost surface of the spectacle lens 1 on the side having the convex portion 6 of the base material and the convex portion 6 of the base material have common light ray focusing characteristics. There is, and this purpose is new.
- the “common ray converging characteristic” refers to a characteristic of converging a ray closer to the object side than a predetermined position A at which the base portion of the spectacle lens converges the ray. Since the shape of the convex portion on the outermost surface of the spectacle lens 1 on the side having the base material convex portion 6 follows the shape of the base material convex portion 6, the common light ray focusing characteristic is obtained.
- the distance closer to the object than the predetermined position A is not particularly limited.
- the position where the light beam is converged by the convex portion on the outermost surface of the spectacle lens 1 on the side having the base material convex portion 6 and the position where the light ray is converged by the base material convex portion 6 are set from a predetermined position A. It may be set in the above range, that is, a range exceeding 0 mm and 10 mm or less.
- the difference in the lens thickness direction between the convex portion 11 shape of the coating film and the convex portion 6 shape of the base material is defined.
- the spectacle lens 1 according to this other aspect does not specify this difference, but may specify the thickness of the coating itself.
- the thickness of the coating film is 3.0 ⁇ m or less (preferably 2.0 ⁇ m or less)
- the shape of the coating film convex portion 11 follows the shape of the base material convex portion 6 well.
- This regulation like the "common ray convergence characteristic", is a regulation that can increase the similarity.
- the provision that "the thickness of the coating film is 3.0 ⁇ m or less (preferably 2.0 ⁇ m or less)" is the same as the difference in the lens thickness direction between the convex portion 11 shape of the coating and the convex portion 6 shape of the base material. , Based on the technical idea that the convex portion of the coating faithfully follows the shape of the convex portion of the base material on the lens base material.
- the technical idea of the spectacle lens of one aspect of the present invention described above can also be applied to a spectacle lens having a hyperopia suppression function.
- the "convex portion" of the coating convex portion 11 and the base material convex portion 6 is changed to a "concave portion".
- the coating recess allows the light rays incident on the spectacle lens to be converged to the position B'closer to the "eyeball side” than the predetermined position A.
- the "convex portion” is changed to a "concave portion” so that the spectacle lens converges to a position B'closer to the "eyeball side” than the predetermined position A.
- lens base materials were prepared. It should be noted that the lens substrate is not laminated with other substances.
- the prescription power was 0.00D for S (spherical power) and 0.00D for C (astigmatism power).
- Forming surface of the convex part of the base material Surface on the object side
- a film was formed on both sides of this lens base material by adopting a spin coating method.
- the conditions of the spin coating method are as follows. Coating liquid: Thermosetting coating agent Rotation speed: 1300 rpm Drying method after spin coating: heating Drying temperature after spin coating: 110 ° C Drying time after spin coating: 90 min
- the defocus power was measured with respect to Example 1 and Comparative Example 1.
- the defocus power (unit: D) is a value indicating how far the light flux is focused from the retina, and can be measured by using ray tracing and a part of the above-mentioned stray light rate measurement method. Is.
- the stray light rate was measured by adopting the above-mentioned method.
- the stray light rate is represented by 100 ⁇ (number of stray light rays) / (number of incident light rays).
- the measurement results of defocus power and stray light rate were obtained as follows. In the range where the convex portion of the base material was formed (within a circle having a radius of 17 mm from the center of the lens), an arbitrary circular region including the entire seven convex portions of the coating film was assumed, and the value in the circular region was adopted as the measurement result.
- the spectacle model and the eyeball model were set by the above-mentioned method, and a large number of rays were incident on the circular region by the ray tracing method to specify the condensing position.
- the eye model and various other conditions are as follows. ⁇ Axial length: 24 mm ⁇ Accommodation of the eye: 0.0D ⁇ Cornea-lens apex distance (CVD): 12.0 mm ⁇ Distance from the apex of the cornea to the center of rotation of the eyeball: 13.0 mm
- CVD Cornea-lens apex distance
- the present invention is not limited to the above conditions.
- FIG. 14A an arbitrary circular region including the entire seven convex portions of the coating film is virtualized.
- FIG. 14B it may be a circular region including all three convex coating portions arranged in a row.
- This circular region may be, for example, a circular region centered on one coating convex portion (and by extension, the base material protruding portion) and including another coating convex portion at the shortest distance from the coating convex portion. In the present specification, this circular region is also referred to as a "minimum unit".
- this circular region may correspond to the diameter of the lens meter (PSF analysis range). Normally, the diameter of the lens meter is 4.0 mm.
- the pitch between the convex portions of the coating film is about the same as the diameter of the lens meter (for example, 4.0 mm)
- one convex portion of the coating film is present in the circular region, and this is the minimum unit. May be.
- the "stray light rate" in the present specification is a result obtained by measuring with respect to the above minimum unit. That is, the "stray light rate" in the present specification includes one coating convex portion (and thus the base material protruding portion) as a center and another coating convex portion at the shortest distance from the coating convex portion (for example, 4.0 mm in diameter).
- the spectacle lens in the present specification has a plurality of the above-mentioned minimum units. If the stray light rate satisfies the above numerical range in at least one of the minimum units of the spectacle lens, the effect of the present invention is exhibited. In a preferred order, the minimum number of the plurality of minimum units exceeding 50%, 80% or more, 90% or more, and 95% or more preferably satisfies the stray light rate regulation.
- the convex surface of the design spectacle model here has a base material base portion as a spherical surface, and the base material convex portion is formed by a spherical surface having a radius of curvature smaller than the radius of curvature of the base material base portion.
- a plurality of design shapes were set by discretely changing the radius of curvature of the convex portion of the base material with respect to the spherical surface of the base material portion having a constant curvature.
- FIG. 13 shows the defocus power (vertical) calculated from the value obtained by subtracting the surface refractive power of the base material base portion from the surface refractive power of the convex portion of the base material (horizontal axis) and the reciprocal of the focusing position. It is a plot which shows the correlation equation with (axis).
- Example 1 The defocus power in Example 1 was measured by using this correlation formula to obtain a value corresponding to the defocus power in the spectacle lens manufactured in Example 1.
- the stray light rate was also calculated from the PSF of the condensing position grasped by the method described in one aspect of the present invention.
- Example 1 and Comparative Example 1 it is assumed that there are seven regions where light rays are concentrated on a plane perpendicular to the optical axis direction at the condensing position (optical axis direction) obtained at the time of the defocus power measurement. Will be done. This is to virtualize an arbitrary circular region including the entire seven convex portions of the coating film. A grid-like grid is set on each measurement surface, the number of light rays passing through each grid is calculated, and when the grid that exceeds a certain level is examined, the light rays are densely distributed in seven regions. Is assumed.
- Example 1 and Comparative Example 1 the positions of the centers of gravity of each of these regions were obtained as a plurality of convergent positions B, and the light rays near the position A were subtracted from the light rays outside the range near the position B to obtain the number of stray light rays. .. From this number of stray light rays, the stray light rate was calculated by the method described in [Mode for carrying out the invention].
- the spectacle lens of Example 1 had a lower stray light rate than the spectacle lens of Comparative Example 1. Specifically, the spectacle lens of Example 1 had a defocus power of 3.51D and the stray light rate was 11.25%, which was 30% or less, whereas the spectacle lens of Comparative Example 1 could not satisfy the conditions. Further, the spectacle lens of Example 1 was able to secure sufficient defocus power as compared with the spectacle lens of Comparative Example 1.
- Example 1 ⁇ Cross-sectional curve of astigmatism at the base of the convex part of the coating> With respect to Example 1, a cross-sectional curve of astigmatism at the root of the convex portion of the coating in the distribution of astigmatism with respect to the outermost surface shape of the coating was obtained.
- the cross-sectional curve can be measured by a technique called coherence correlation interference measurement.
- Example 1 The result of Example 1 is shown in FIG. 11 mentioned above.
- the cross-sectional curve of the astigmatism at the root of the convex portion of the coating in the astigmatism distribution with respect to the outermost surface shape of the coating is 0.20 mm or less, while that of Comparative Example 1 The conditions could not be met.
- Eyeglass lens 2 Lens base material 3 Object side surface (convex surface) 4 Eyeball side surface (concave surface) 6 Substrate convex part 8 Hard coat film 10 Antireflection film 11 Film convex part 20 Eyeball 20A Retina 30 Eyeglass lens model 32 Eyeball model 32A Retina 33 Object-side surface (convex surface) on the model Convex part of the coating on the 36 model
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Abstract
Description
眼鏡レンズの最表面にある凸部の形状を基材凸部近似形状とする場合、近視抑制効果が十分に発揮可能となるという知見を得た。
好適には、実際の被膜凸部形状から基材凸部形状(すなわち部分球面形状)を仮想する。この仮想部分球面形状と実際の被膜凸部形状とを比べたときに差異が所定の値に留まる場合、近視抑制効果が更に発揮可能となるという知見を得た。
本発明の第1の態様は、
物体側の面から入射した光線を眼球側の面から出射させて所定の位置Aに収束させる眼鏡レンズにおいて、
前記物体側の面と前記眼球側の面とのうち少なくとも一方の面に基材凸部を複数有するレンズ基材と、
前記基材凸部を有する面を覆う被膜と、を備え、
前記基材凸部を有する側の眼鏡レンズの最表面にある被膜凸部の形状は、前記眼鏡レンズに入射した光線を、前記所定の位置Aよりも物体側寄りの位置Bに収束させる基材凸部近似形状である、眼鏡レンズである。
光線追跡計算により得られる、前記眼鏡レンズの前記物体側の面の所定範囲内に均等に入射して前記被膜を通過する多数の光線のうち、前記所定の位置A近傍を通過せず、且つ、前記物体側寄りの位置B近傍も通過しない迷光光線の本数は入射光線本数の30%以下である。
前記被膜の最表面形状に対する非点収差分布における前記被膜凸部の根元での非点収差の断面曲線が0.20mm以下である、眼鏡レンズである。
前記被膜凸部形状に対して最適近似させた球面と、実際の被膜凸部形状との間のレンズ厚さ方向での差の絶対値の最大値が0.1μm以下である、眼鏡レンズである。
前記被膜凸部の突出距離Lcと、前記基材凸部の突出距離Llとの関係が以下の式(1)を満たす。
0.6≦Lc/Ll≦1.5 ・・・式(1)
前記被膜凸部は、前記眼鏡レンズに入射した光線を、前記所定の位置Aよりも物体側に0mmを超え且つ10mm以下の範囲で寄せた位置Bに収束させる。
前記被膜は、前記レンズ基材と接するλ/4膜と、前記λ/4膜の上に形成されたハードコート膜と、前記ハードコート膜の上に形成された反射防止膜とを有する。
前記レンズ基材の屈折率は前記λ/4膜よりも高く、前記λ/4膜の屈折率は前記ハードコート膜よりも高い。
迷光率を0%超え(または1%以上、更には3%以上)且つ30%以下と設定しても構わない。また、迷光率を減らすのが好ましいことから、20%以下と設定するのが好ましく、15%以下と設定するのがより好ましい。
眼鏡レンズの最表面(すなわち被膜の最表面)は、眼鏡レンズに入射した光線を、所定の位置Aよりも物体側に0mmを超え且つ10mm以下の範囲で寄せた位置Bに収束させる形状を有する。なお、前記範囲は0.1~7mmが好ましく、0.1~5mmがより好ましく、0.3~3mmが更に好ましい。
物体側の面から入射した光線を眼球側の面から出射させて所定の位置Aに収束させる眼鏡レンズにおいて、
前記物体側の面と前記眼球側の面とのうち少なくとも一方の面に基材凸部を複数有するレンズ基材を備え、
前記所定の位置A近傍を通過せず、且つ、前記所定の位置Aよりも物体側寄りの位置B近傍も通過しない迷光光線の発生を抑制する構成を有する、眼鏡レンズである。
物体側の面から入射した光線を眼球側の面から出射させて所定の位置Aに収束させる眼鏡レンズにおいて、
前記物体側の面と前記眼球側の面とのうち少なくとも一方の面に基材凸部を複数有するレンズ基材と、
前記基材凸部を有する面を覆う被膜と、を備え、
前記被膜は3.0μm以下である、眼鏡レンズである。
物体側の面から入射した光線を眼球側の面から出射させて所定の位置Aに収束させる眼鏡レンズにおいて、
前記物体側の面と前記眼球側の面とのうち少なくとも一方の面に基材凸部を複数有するレンズ基材と、
前記基材凸部を有する面を覆う被膜と、を備え、
前記基材凸部を有する側の眼鏡レンズの最表面にある凸部と、前記基材凸部とは、共通した光線収束特性を有する、眼鏡レンズである。
図1では、物体側の面3が凸面であり、眼球側の面4が凹面である例(いわゆるメニスカスレンズの例)を挙げる。
本明細書においては、眼鏡レンズを正面視したときの左右(水平)方向をX方向、上下方向をY方向、レンズ厚さ方向且つ光軸方向をZ方向とする。
図5は、本発明の一態様による眼鏡レンズの検査方法の流れを示すフローチャートである。
以上の工程により、光軸方向(レンズ厚さ方向、Z軸)における、光線が集光する位置を特定可能となる。
0.6≦Lc/Ll≦1.5 ・・・式(1)
この条件を満たせば、基材凸部6に被膜が形成されたとしても、基材凸部6に由来する被膜凸部11は、眼鏡レンズ1に入射した光線の収束位置Bを、前記所定の位置Aよりも物体側に十分に寄せられる。これは、被膜凸部11ひいては本発明の一態様の眼鏡レンズ1が、十分な近視抑制効果を発揮できることを意味する。
図11は、実際の被膜凸部11およびその近傍に対する非点収差分布における、被膜凸部11の頂点(すなわち平面視での被膜凸部の中心)を通過する断面での非点収差分布(すなわち非点収差断面曲線)のプロット(実線)を示す図である。
左縦軸は非点収差(および平均度数)の値を示し単位はディオプターである。
右縦軸は被膜凸部11または基材凸部6の高さを示し単位はmmである。
なお、被膜凸部11または基材凸部6は横軸において0.3~1.3mmの部分である。また、平均度数分布(すなわち平均度数分布断面曲線)のプロット(点線)、および被膜凸部11または基材凸部6のZ軸の高さのプロット(破線)も示す。
基材凸部6のサイズおよびレンズ基材2の表面における複数の基材凸部6の配置の態様は、特に限定されるものではない。物体側の面から入射した光束を眼球側の面から出射させ、網膜よりも物体側(前方)に収束させる作用を主に担えれば、基材突出部には限定は無い。例えば、基材凸部6の外部からの視認性、基材凸部6によるデザイン性付与、基材凸部6による屈折力調整等の観点から決定できる。
上記のように基材突出部のサイズには限定は無く、基材突出部の根元に形成される被膜の厚さの偏在化をもたらす大きさまたは形状であればよい。例えば、平面視円形であってもよいし、三次元形状としては球面であってもよい。平面視楕円形状であってもよいし、三次元形状としてはトーリック形状であってもよい。これは、被膜凸部の形状についても当てはまる。
図14(a)は、平面視において、各被膜凸部の中心が正三角形の頂点となるよう各々独立した離散配置(ハニカム構造の頂点に各被膜凸部の中心が配置)を採用した場合の図であり、図14(b)は、平面視において、各被膜凸部が一列に配置された構造を採用した場合の図である。点線は、迷光率の測定の際に使用する任意の円形領域である(詳しくは後述)。
上記のように基材突出部の配置の態様には限定は無い。後掲の実施例1および図14(a)に示すように、平面視において、各基材突出部の中心が正三角形の頂点となるよう各々独立した離散配置(ハニカム構造の頂点に各基材突出部の中心が配置)を採用してもよい。
後掲の図14(b)に示すように、平面視において、各基材突出部が一列に配置された構造を採用してもよい。更に、各基材突出部が一列に配置されつつ、該列と隣接して別の基材突出部が配列された構造を採用してもよい。その際、一列内での基材突出部間のピッチ(基材突出部の中心間の距離、以降同様。)と、ある列の基材突出部と、該基材突出部隣接する別の列の基材突出部との間のピッチとが異なってもよい。また、一列内での基材突出部同士の間隔と、隣接する列同士の間隔とが異なってもよい。
基材凸部6の高さは、例えば0.1~10μmとしてもよく、0.5~2μm(基材突出部の屈折力2.50~6.50Dに相当)であってもよい。基材突出部の屈折力の上限は5.50Dまたは5.00Dであってもよく、下限は3.00Dであってもよい。基材凸部6の表面の曲率半径は、例えば50~250mmRとしてもよい。また、隣り合う基材凸部6間の距離(ある基材凸部6の端部とこの基材凸部6と隣り合う基材凸部6の端部との距離)は、例えば基材凸部6の半径の値と同じ程度としてもよい。また、複数の基材凸部6は、例えばレンズ中心付近にほぼ均一に配置できる。
特許文献1の図10に記載のように、眼鏡レンズの中央部に基材突出部を形成してもよいし、特許文献1の図1に記載のように、眼鏡レンズの中央部に基材突出部を形成しなくてもよい。
レンズ基材2の基材凸部6を有する表面上に形成される被膜の一態様としては、硬化性化合物を含む硬化性組成物を硬化して形成される硬化膜が挙げられる。かかる硬化膜は、一般にハードコート膜8と呼ばれ、眼鏡レンズ1の耐久性向上に寄与する。硬化性化合物とは硬化性官能基を有する化合物を意味し、硬化性組成物とは硬化性化合物を一種以上含む組成物を意味する。
(R1)a(R3)bSi(OR2)4-(a+b) ・・・(I)
R2で表される炭素数1~4のアシル基としては、例えば、アセチル基、プロピオニル基、オレイル基、ベンゾイル基等が挙げられる。
R2で表される炭素数6~10のアリール基としては、例えば、フェニル基、キシリル基、トリル基等が挙げられる。
R3で表される炭素数1~6のアルキル基は、直鎖または分岐のアルキル基であって、具体例としては、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基等が挙げられる。
R3で表される炭素数6~10のアリール基としては、例えば、フェニル基、キシリル基、トリル基等が挙げられる。
前記一般式(I)で表される化合物の具体例としては、特開2007-077327号公報の段落0073に記載されている化合物を挙げられる。一般式(I)で表される有機ケイ素化合物は硬化性基を有するため、塗布後に硬化処理を施すことにより、硬化膜としてハードコート膜8を形成できる。
レンズ基材2の基材凸部6を有する表面上に被膜を形成するための塗布液の供給は、スピンコートにより行われる。塗布をスピンコートで行うことにより、基材凸部6周辺に液溜まりが生じること等に起因して被膜の膜厚が不均一になることを抑制できる。スピンコートによる塗布は、例えば、スピンコーターに基材凸部6を有する表面を鉛直上方を向けてレンズ基材2を配置し、スピンコーター上でレンズ基材2を回転させた状態で、前記表面上に上方から塗布液を供給する(例えば前記表面の上方に配置されたノズルから塗布液を吐出する)ことにより行える。ここでスピンコートにおけるレンズ基材2の回転速度は、膜厚がより均一な被膜を形成する観点から、10~3000rpm(rotations per minute)の範囲とすることが好ましく、50~2500rpmの範囲とすることがより好ましく、100~2000rpmの範囲とすることが更に好ましい。但し、本発明はスピンコート法に限定されず、公知の手法(例えばディップ法)を使用して実現しても構わない。
被膜凸部の高さは、基材突出部と同様、例えば0.1~10μmとしてもよく、0.5~2μmが好ましい。被膜凸部のデフォーカスパワーも、基材突出部と同様、基材突出部の屈折力2.50~6.50Dであってもよい。デフォーカスパワーの上限は5.50Dまたは5.00Dであってもよく、下限は3.00Dであってもよい。
本明細書における「デフォーカスパワー」は、各デフォーカス領域の屈折力と、各デフォーカス領域以外の部分の屈折力との差を指す。別の言い方をすると、「デフォーカスパワー」とは、デフォーカス領域の所定箇所の最小屈折力と最大屈折力の平均値からベース部分の屈折力を差し引いた差分である。本明細書においては、デフォーカス領域が凸部領域である場合を例示する。
本明細書における「屈折力」は、屈折力が最小となる方向aの屈折力と、屈折力が最大となる方向b(方向aに対して垂直方向)の屈折力との平均値である平均屈折力を指す。
また、レンズ基材2の一方の表面が基材凸部6を有さない場合、そのようなレンズ基材2表面にも一層以上の被膜を形成できる。かかる被膜としては、眼鏡レンズ1に通常設けられる各種被膜(例えば、ハードコート膜8、プライマー膜、反射防止膜10、防汚膜、防曇膜等)を挙げることができ、これら被膜の形成方法についても公知技術を適用できる。
光線追跡計算により得られる、眼鏡レンズの物体側の面の所定範囲内に均等に入射して被膜を通過する多数の光線のうち、所定の位置A近傍を通過せず、且つ、物体側寄りの位置B近傍も通過しない迷光光線の本数は入射光線本数の30%以下に設定する。
言い方を変えると以下の構成である。
「物体側の面から入射した光線を眼球側の面から出射させて所定の位置Aに収束させる眼鏡レンズにおいて、
前記物体側の面と前記眼球側の面とのうち少なくとも一方の面に基材凸部を複数有するレンズ基材を備え、
前記所定の位置A近傍を通過せず、且つ、前記所定の位置Aよりも物体側寄りの位置B近傍も通過しない迷光光線の発生を抑制する構成を有する、眼鏡レンズ。」
別の一態様においては、実際の被膜凸部形状と実際の基材凸部形状との間のレンズ厚さ方向での差の絶対値の最大値が0.1μm以下(好ましくは0.06μm以下)とする。
「物体側の面から入射した光線を眼球側の面から出射させて所定の位置Aに収束させる眼鏡レンズにおいて、
前記物体側の面と前記眼球側の面とのうち少なくとも一方の面に基材凸部を複数有するレンズ基材と、
前記基材凸部を有する面を覆う被膜と、を備え、
前記被膜は3.0μm以下である、眼鏡レンズ。」
「物体側の面から入射した光線を眼球側の面から出射させて所定の位置Aに収束させる眼鏡レンズにおいて、
前記物体側の面と前記眼球側の面とのうち少なくとも一方の面に基材凸部を複数有するレンズ基材と、
前記基材凸部を有する面を覆う被膜と、を備え、
前記基材凸部を有する側の眼鏡レンズの最表面にある凸部と、前記基材凸部とは、共通した光線収束特性を有する、眼鏡レンズ。」
以下のレンズ基材を作製した。なお、レンズ基材に対する他物質による積層は行っていない。処方度数はS(球面度数)は0.00Dとし、C(乱視度数)は0.00Dとした。
レンズ基材の平面視での直径:100mm
レンズ基材の種類:PC(ポリカーボネート)
レンズ基材の屈折率:1.589
レンズ基材のベースカーブ:3.30D
基材凸部の形成面:物体側の面
基材凸部の平面視での形状:正円(直径1mm)
基材凸部の基材ベース部からの高さ:0.8mm
基材凸部の平面視での配置:各基材凸部の中心が正三角形の頂点となるよう各々独立して離散配置(ハニカム構造の頂点に各基材凸部の中心が配置)
基材凸部が形成された範囲:レンズ中心から半径17mmの円内
各基材凸部間のピッチ(基材凸部の中心間の距離):1.5mm
被膜用液:熱硬化型コーティング剤
回転数:1300rpm
スピンコート後の乾燥手法:加熱
スピンコート後の乾燥温度:110℃
スピンコート後の乾燥時間:90min
スピンコート法の条件は以下の通りとした。それ以外は実施例1と同様とした。
被膜用液:熱硬化型コーティング剤
回転数:800rpm
スピンコート後の乾燥手法:加熱
スピンコート後の乾燥温度:110℃
スピンコート後の乾燥時間:90min
実施例1および比較例1に対し、デフォーカスパワーを測定した。デフォーカスパワー(単位:D)は、網膜からどれだけ離れた距離にて光束が集光するかを示す値であり、光線追跡および上述の迷光率の測定手法の一部を利用して測定可能である。
・眼軸長:24mm
・眼の調節量:0.0D
・角膜-レンズ頂点間距離(CVD):12.0mm
・角膜頂点から眼球の回転中心までの距離:13.0mm
以降、特記無い限り、上記条件を採用する。但し、本発明は上記各条件に限定されない。
例えば、上記例では、図14(a)に示すような、被膜凸部を7個丸ごと含む任意の円形領域を仮想した。その一方、図14(b)に示すような、一列に並んだ被膜凸部を3個丸ごと含む円形領域でもよい。この円形領域は、例えば、一つの被膜凸部(ひいては基材突出部)を中心としてその被膜凸部から最短距離にある別の被膜凸部を丸ごと含む円形領域としてもよい。本明細書では、この円形領域のことを「最小単位」とも呼ぶ。図14(a)だと、該別の被膜凸部が6個存在し、図14(b)だと、該別の被膜凸部が2個存在することになる。
なお、この円形領域は、レンズメーター(PSF解析範囲)の直径に相当させてもよい。通常、レンズメーターの直径は4.0mmである。仮に、被膜凸部間(基材突出部間)のピッチがレンズメーターの直径(例えば4.0mm)と同程度だった場合、円形領域に1個の被膜凸部を存在させ、これを最小単位としてもよい。
本明細書における「迷光率」は、上記最小単位に対して測定して得られた結果である。つまり、本明細書における「迷光率」は、一つの被膜凸部(ひいては基材突出部)を中心としてその被膜凸部から最短距離にある別の被膜凸部を丸ごと含む(例えば直径4.0mmの)円形領域を最小単位とし、上記最小単位に対して測定して得られた結果である。
本明細書における眼鏡レンズには上記最小単位は複数存在する。該眼鏡レンズの少なくとも一つの上記最小単位において、迷光率が上記数値範囲を満たせば、本発明の効果は奏される。好適な順に、複数の上記最小単位のうち50%を超える数、80%以上、90%以上、95%以上の数の最小単位が上記迷光率の規定を満たすのが好ましい。
実施例1に対し、被膜の最表面形状に対する非点収差分布における被膜凸部の根元での非点収差の断面曲線を得た。該断面曲線は、コヒーレンス相関干渉測定という手法により測定可能である。
2 レンズ基材
3 物体側の面(凸面)
4 眼球側の面(凹面)
6 基材凸部
8 ハードコート膜
10 反射防止膜
11 被膜凸部
20 眼球
20A 網膜
30 眼鏡レンズモデル
32 眼球モデル
32A 網膜
33 モデル上での物体側の面(凸面)
36 モデル上での被膜凸部
Claims (5)
- 物体側の面から入射した光線を眼球側の面から出射させて所定の位置Aに収束させる眼鏡レンズにおいて、
前記物体側の面と前記眼球側の面とのうち少なくとも一方の面に基材凸部を複数有するレンズ基材と、
前記基材凸部を有する面を覆う被膜と、を備え、
前記基材凸部を有する側の眼鏡レンズの最表面にある被膜凸部の形状は、前記眼鏡レンズに入射した光線を、前記所定の位置Aよりも物体側寄りの位置Bに収束させる基材凸部近似形状である、眼鏡レンズ。 - 光線追跡計算により得られる、前記眼鏡レンズの前記物体側の面の所定範囲内に均等に入射して前記被膜を通過する多数の光線のうち、前記所定の位置A近傍を通過せず、且つ、前記物体側寄りの位置B近傍も通過しない迷光光線の本数は入射光線本数の30%以下である、請求項1に記載の眼鏡レンズ。
- 前記被膜の最表面形状に対する非点収差分布における前記被膜凸部の根元での非点収差の断面曲線が0.20mm以下である、請求項1または2に記載の眼鏡レンズ。
- 前記被膜凸部形状に対して最適近似させた球面と、実際の被膜凸部形状との間のレンズ厚さ方向での差の絶対値の最大値が0.1μm以下である、請求項1~3のいずれかに記載の眼鏡レンズ。
- 前記被膜凸部の突出距離Lcと、前記基材凸部の突出距離Llとの関係が以下の式(1)を満たす、請求項1~4のいずれかに記載の眼鏡レンズ。
0.6≦Lc/Ll≦1.5 ・・・式(1)
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US20170131567A1 (en) | 2015-11-06 | 2017-05-11 | Hoya Lens Thailand Ltd. | Spectacle Lens |
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WO2020079105A1 (en) * | 2018-10-16 | 2020-04-23 | Essilor International | Optical lens |
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EP3693737B1 (en) | 2015-03-27 | 2022-03-30 | Agilent Technologies, Inc. | Method and system for determining integrated metabolic baseline and potential of living cells |
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WO2021131454A1 (ja) | 2021-07-01 |
CN113064287A (zh) | 2021-07-02 |
US20230020067A1 (en) | 2023-01-19 |
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