WO2023188558A1 - 眼鏡レンズおよび眼鏡レンズの設計方法 - Google Patents
眼鏡レンズおよび眼鏡レンズの設計方法 Download PDFInfo
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- WO2023188558A1 WO2023188558A1 PCT/JP2022/045392 JP2022045392W WO2023188558A1 WO 2023188558 A1 WO2023188558 A1 WO 2023188558A1 JP 2022045392 W JP2022045392 W JP 2022045392W WO 2023188558 A1 WO2023188558 A1 WO 2023188558A1
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- Prior art keywords
- defocus
- eyeball
- object side
- base surface
- power
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 22
- 238000013461 design Methods 0.000 title description 8
- 210000005252 bulbus oculi Anatomy 0.000 claims abstract description 102
- 230000003287 optical effect Effects 0.000 claims abstract description 61
- 210000001525 retina Anatomy 0.000 claims abstract description 39
- 230000004907 flux Effects 0.000 claims description 46
- 239000000463 material Substances 0.000 claims description 23
- 201000006318 hyperopia Diseases 0.000 description 35
- 230000004305 hyperopia Effects 0.000 description 35
- 238000004519 manufacturing process Methods 0.000 description 17
- 238000005520 cutting process Methods 0.000 description 14
- 230000009467 reduction Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000003754 machining Methods 0.000 description 6
- 210000001747 pupil Anatomy 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 206010020675 Hypermetropia Diseases 0.000 description 4
- 230000004075 alteration Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 210000001508 eye Anatomy 0.000 description 3
- 208000014733 refractive error Diseases 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 206010010071 Coma Diseases 0.000 description 1
- 241000385223 Villosa iris Species 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
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
- G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
Definitions
- the present invention relates to a spectacle lens and a method of designing a spectacle lens.
- One type of spectacle lens that has the function of reducing farsightedness is one in which a local concave portion (segment surface) with a power is added to the normally prescribed lens surface (base surface).
- Patent Document 1 describes a defocus area that has the effect of converging a light flux to a position farther from the object side than position A on the retina (that is, further back than position A) in the direction of light travel. There is a description of the constructed spectacle lens.
- An object of the present invention is to provide a technique suitable for realizing a farsightedness reducing function by means of local concave portions on the lens surface of a spectacle lens.
- the first aspect of the present invention is At least one of the two optical surfaces, one on the object side and one on the eyeball side, a base surface that emits a light flux incident from the object side to the eyeball side and converges it at a position A on the retina of the eyeball; a plurality of defocus surfaces that emit a light flux incident from the object side toward the eyeball side and converge it at a position B that is farther from the object side than the position A; It is composed of The spectacle lens is such that the power Pb of the base surface and the defocus power Ps of the defocus surface satisfy the relationship -0.25Ps ⁇ Pb ⁇ -Ps.
- the second aspect of the invention is At least one of the two optical surfaces, one on the object side and one on the eyeball side, a base surface that emits a light flux incident from the object side to the eyeball side and converges it at a position A on the retina of the eyeball; a plurality of defocus surfaces that emit a light flux incident from the object side toward the eyeball side and converge it at a position B that is farther from the object side than the position A; It is composed of The power Pb of the base surface, the defocus power Ps of the defocus surface, and the refractive index N of the lens base material on which the optical surface is based satisfy Pb ⁇ -0.5(N-1)-Ps. It is a spectacle lens that satisfies the relationship.
- the third aspect of the present invention is At least one of the two optical surfaces, one on the object side and one on the eyeball side, a base surface that emits a light flux incident from the object side to the eyeball side and converges it at a position A on the retina of the eyeball; a plurality of defocus surfaces that emit a light flux incident from the object side toward the eyeball side and converge it at a position B that is farther from the object side than the position A; It is composed of The power Pb of the base surface, the defocus power Ps of the defocus surface, the arrangement pitch L of the defocus surface, and the plane size ⁇ of the defocus surface are (-Ps ⁇ 2 )/L 2 This is a spectacle lens that satisfies the relationship ⁇ Pb.
- the fourth aspect of the present invention is At least one of the two optical surfaces, one on the object side and the other on the eyeball side, has a base surface that directs the light flux incident from the object side to the eyeball side and converges on position A on the retina of the eyeball, and a base surface that directs the light flux incident from the object side to the eyeball side.
- a step of designing the optical surface so as to have a plurality of defocus surfaces that emit light to the side and converge at a position B that is farther from the object side than the position A;
- the base surface and This is a method of designing a spectacle lens, in which the defocus surface is designed.
- the fifth aspect of the present invention is At least one of the two optical surfaces, one on the object side and the other on the eyeball side, has a base surface that directs the light flux incident from the object side to the eyeball side and converges on position A on the retina of the eyeball, and a base surface that directs the light flux incident from the object side to the eyeball side.
- a step of designing the optical surface so as to have a plurality of defocus surfaces that emit light to the side and converge at a position B that is farther from the object side than the position A;
- the power Pb of the base surface, the defocus power Ps of the defocus surface, and the refractive index N of the lens base material on which the optical surface is based satisfy Pb ⁇ -0.
- 5(N-1)-Ps the base surface and the defocus surface are designed to satisfy the relationship: 5(N-1)-Ps.
- the sixth aspect of the present invention is At least one of the two optical surfaces, one on the object side and the other on the eyeball side, has a base surface that directs the light flux incident from the object side to the eyeball side and converges on position A on the retina of the eyeball, and a base surface that directs the light flux incident from the object side to the eyeball side.
- the optical surface so as to have a plurality of defocus surfaces that emit light to the side and converge at a position B that is farther from the object side than the position A;
- the power Pb of the base surface, the defocus power Ps of the defocus surface, the arrangement pitch L of the defocus surface, and the plane size ⁇ of the defocus surface are ( -Ps ⁇ 2 )/L 2 ⁇ Pb
- the base surface and the defocus surface are designed to satisfy the relationship: -Ps ⁇ 2 )/L 2 ⁇ Pb.
- the localized concave portions on the lens surface of the spectacle lens are suitable for realizing a farsightedness reducing function.
- FIG. 2 is a side cross-sectional view showing an example of a main part configuration of one form of a spectacle lens that exhibits a farsightedness reduction function.
- FIG. 2 is an explanatory diagram showing one form of mold processing for a spectacle lens that exhibits a farsightedness reducing function.
- FIG. 2 is an explanatory diagram showing one form of external view of a spectacle lens that exhibits a farsightedness reducing function.
- FIG. 2 is an explanatory diagram showing one form of shape measurement of a spectacle lens that performs a farsightedness reduction function.
- FIG. 7 is an explanatory diagram showing another form of shape measurement of a spectacle lens that performs a farsightedness reduction function.
- FIG. 2 is a plan view showing one form of an object-side surface of a spectacle lens that exhibits a farsightedness reduction function.
- FIG. 2 is an explanatory diagram schematically illustrating the optical characteristics of a spectacle lens that exhibits a farsightedness reducing function.
- FIG. 1 is a side sectional view showing an example of the main part configuration of one form of a spectacle lens that exhibits a farsightedness reduction function. As shown in the illustrated example, there is a spectacle lens that has a function of reducing farsightedness in which a local recess (segment surface) 12 is added to a lens surface (base surface) 11.
- a local recess segment surface 12
- base surface base surface
- the base surface 11 is designed to achieve a refractive power appropriately designed based on the wearer's prescription so as to focus on the retina.
- the light that has passed through the segment plane 12 is focused at a position farther from the object side than on the retina (that is, position B, which is farther back than position A).
- the segment surface 12 has a defocus power Ps that is deviated from the base surface 11 so that it is focused at a position defocused from the position A, and thus has a refractive power different from that of the base surface 11. is now being realized.
- the segment plane may also be referred to as a "defocus plane.”
- the base surface 11 converges the light beam at position A on the retina, while the segment surface 12 converges the light beam at position B on the back side of the retina.
- spectacle lenses have a function of reducing farsightedness among the refractive errors of the wearer's eyes (that is, farsightedness reducing function).
- the lens base material that constitutes the spectacle lens is usually manufactured by molding using a mold.
- the mold used for manufacturing the lens base material is formed by cutting according to the surface shape of the lens base material.
- cutting will be performed sequentially by drilling the base surface shape and then adding the segment surface shape. is possible.
- the segment surface has a concave shape, it is impossible to perform sequential cutting using such a procedure, and it is necessary to form the base surface shape and the segment surface shape at the same time.
- FIG. 2 is an explanatory diagram showing one form of mold processing for a spectacle lens that exhibits a farsightedness reducing function.
- machining molds for example, use a round-tipped cutting tool for curved surfaces with negative and small curvatures (tight concave curves), and use round-tipped cutting tools for molds with large negative curvatures (gentle convex curves or gentle concave curves).
- round-tipped cutting tools for molds with large negative curvatures (gentle convex curves or gentle concave curves).
- the corresponding portion of the base surface shape and the corresponding portion of the segment surface shape in the mold 20 are in a relationship that requires the use of the flat cutting tool 21 and the round tip cutting tool 22. In some cases, the productivity (efficiency) of mold processing may be reduced. On the other hand, as shown in FIG. 2(b), if each corresponding part of the mold 20 can be processed with the same cutting tool 23, the decrease in productivity can be suppressed. However, even if productivity reduction can be suppressed, if the shape of the tip of the cutting tool 23 is not suitable for the curved surface shape to be processed, there is a risk that machining marks periodically formed according to the feed pitch of the cutting tool 23 may remain.
- machining marks can cause light diffraction and cause reflections like interference colors called rainbows, which can lead to deterioration in machining quality, so their occurrence should be prevented. be.
- the mold 20 can be processed with the same tool, and the tip shape of the tool is suitable for each curved surface shape. It is preferable that the
- FIG. 3 is an explanatory diagram showing one form of an external view of a spectacle lens that exhibits a farsightedness reducing function.
- a wearer of a spectacle lens that has a function of reducing farsightedness may face another person while maintaining a certain distance (for example, a distance of about 2 meters that should be maintained as a social distance). In this case, for example, as shown in FIG.
- the concave shape constituting the segment surface is such that the reflected light from the outside is focused on the person facing the other person (for example, a gentle concave curve). If the lens is an object), there may be an inconvenience that the other person facing the eyeglass lens (that is, the person viewing the eyeglass lens from the outside) may feel glare.
- the concave shape that forms the segment surface as shown in FIG. 3(b), reflected light from the outside is focused on the side closer to the person facing the other person and turned into diverging light. It is preferable that it be of a shape (for example, a shape with a tight concave curve).
- FIG. 4 is an explanatory diagram showing one form of shape measurement of a spectacle lens that performs a farsightedness reduction function.
- FIG. 5 is an explanatory diagram showing another form of shape measurement of a spectacle lens that performs a farsightedness reduction function.
- the shape measurement of the surface shape of a spectacle lens is performed using, for example, a white interferometer.
- a white interferometer measures the shape of a surface by converting information on interference fringes obtained from optical path differences caused by surface irregularities into height information.
- the interference depth of white light is as narrow as about 2 ⁇ m. Therefore, for example, if the sag amount of the base surface shape is large as shown in FIG. 4(a) or the sag amount of the segment surface shape is large as shown in FIG. 4(b), the white color used for shape measurement There may be a problem that the surface shape cannot be detected at the depth of the interferometer. In other words, in order to be able to measure the shape regardless of the depth of the white interferometer, it is advantageous for both the base surface shape and the segment surface shape to have a small sag amount, as shown in FIG. 4(c). . When measuring the position of a segment plane on the surface of a spectacle lens, for example, as shown in FIG. It will be done.
- the center position of the segment plane by taking into account the minimum point of the segment plane in addition to the boundary position, as shown in FIG. 5(b).
- the segment surface in order to correctly identify the center position of the segment surface, the segment surface needs to have a shape that allows the minimum point to be identified.
- the relationship between the base surface shape and the segment surface shape must be such that both have a small amount of sag and a segment surface shape that allows the minimum point to be identified. It is preferable that there be.
- the present invention was devised based on the inventor's knowledge explained above, and provides a technique suitable for realizing a farsightedness reduction function by means of local concave portions on the lens surface of an eyeglass lens. . This technique will be specifically described below in this embodiment.
- the spectacle lens 1 has an object-side surface 2 and an eyeball-side surface 3 as two optical surfaces.
- the "object-side surface” is a surface located on the object side when glasses equipped with the spectacle lenses 1 are worn by a wearer.
- the "eyeball side surface” is the opposite, that is, the surface located on the eyeball side when the glasses equipped with the spectacle lenses 1 are worn by a wearer.
- the spectacle lens 1 is configured to include a lens base material.
- the lens base material is formed of a thermosetting resin material such as thiourethane, allyl, acrylic, or epithio. Note that as the resin material constituting the lens base material, other resin materials that provide a desired refractive index may be selected. Furthermore, the lens base material may be made of inorganic glass instead of resin material.
- a coating is formed on at least one of the object-side surface and the eyeball-side surface of the lens base material.
- the film include a hard coat film and an antireflection film (AR film), but in addition to these, other films may also be formed.
- the hard coat film is formed using, for example, a thermoplastic resin or a UV curable resin.
- the hard coat film can be formed by immersing the lens substrate in a hard coat liquid, using spin coating, or the like. By coating with such a hard coat film, the durability of the spectacle lens 1 can be improved.
- the antireflection film is formed by, for example, forming an antireflection agent such as ZrO 2 , MgF 2 , Al 2 O 3 by vacuum deposition. By coating with such an antireflection film, it becomes possible to improve the visibility of the image transmitted through the spectacle lens 1.
- the surface shape of the eyeglass lens 1, which will be described later, may be realized by the lens base material that constitutes the eyeglass lens 1, or may be realized by a coating that covers the lens base material. good.
- the spectacle lens 1 is a farsightedness reducing lens that has a farsightedness reducing function.
- the spectacle lens 1 is configured such that at least one of two optical surfaces, an object-side surface 2 and an eyeball-side surface 3, has a base surface 11 and a plurality of defocus surfaces 12.
- a base surface 11 and a defocus surface 12 are provided on the object side surface 2.
- the base surface 11 and the plurality of defocus surfaces 12 constitute the object-side surface 2 .
- the present invention is not limited thereto, and the object-side surface 2 may have a surface other than these in addition to the base surface 11 and the defocus surface 12.
- the base surface 11 is a surface that constitutes a region on the lens designed based on the prescribed refractive power of the wearer.
- the spectacle lens 1 allows the light flux that has entered the base surface 11 from the object side to exit from the eyeball side surface 3, and passes through the pupil of the wearer's eyeball onto the retina. is configured to converge at a predetermined position (position A).
- the base surface 11 is a surface located on the object side, and is constituted by a convex surface that protrudes toward the object side.
- the convex surface constituting the base surface 11 is not particularly limited in its surface shape as long as it can achieve the prescribed refractive power of the wearer and does not impair the purpose of the present invention. That is, the surface shape of the base surface 11 may be, for example, a spherical shape, an aspherical shape, a toric surface shape, or a mixed shape thereof. In this embodiment, a case where the base surface 11 has a spherical shape is illustrated.
- the prescription refractive power realized by the base surface 11 may be set to have a weak or strong refractive power depending on the wearer's adaptability to the glasses, preference, etc. In that case, the position at which the light beam converges is not strictly above the retina, but is slightly shifted, but in this specification it is regarded as convergence on the retina.
- Each of the plurality of defocus surfaces 12 is a surface that constitutes a region on the lens designed to function as a segment surface with a power different from that of the base surface 11.
- the spectacle lens 1 allows the light flux that has entered the defocus surface 12 from the object side to exit from the eyeball side surface 3, and passes through the pupil of the wearer's eyeball.
- the light beam is configured to converge at a position farther from the object side than position A (that is, position B, which is deeper on the retina than position A).
- the defocus surface 12 is a surface located on the object side like the base surface 11, but has a different surface shape from the base surface 11, so that the light beam is directed to the condensing position by the base surface 11. is constructed so as not to collect light.
- the defocus surface 12 is configured as a locally concave segment surface. Due to such a difference in surface shape, the defocus surface 12 has a difference in luminous flux even if the surface 3 on the eyeball side has the same surface shape in the area facing the base surface 11 and the area facing the defocus surface 12. This means that the light can be converged at a position different from the position at which the light is focused by the base surface 11 (specifically, position B, which is deeper than position A on the retina).
- the power of the base surface 11 is Pb (unit: D, diopter) and the defocus power of the defocus surface 12 is Ps (unit: D, diopter)
- the power Pb and the defocus power Ps are Ps ⁇ - 0.25 and satisfies the relationship of Pb+Ps ⁇ 0.
- the defocus power Ps of the defocus surface 12 is not simply a "power” but a "defocus power”, so the deviation of the curve of the defocus surface 12 from the base surface 11 is expressed in units of D (diopter). It is expressed as In other words, the defocus power Ps corresponds to the relative difference between the defocus surface 12 and the base surface 11. Therefore, Pb+Ps becomes the power of the defocused surface 12.
- the surface shape of the defocus surface 12 may be, for example, a spherical shape, but it is not limited to this, and other surface shapes may be used.
- the center and peripheral parts of the segment are made into an aspherical surface with different curvatures, and in order to add astigmatism that matches the ocular aberration, the curvature is changed by the cross section in the segment.
- the segments may have different toroidal shapes, the segments may have an asymmetric shape to add a depth expansion effect due to coma aberration, or the segments may have a shape that is a combination of the above shapes to compound the aberrations.
- FIG. 6 is a plan view showing one form of the object-side surface of a spectacle lens that exhibits a farsightedness reducing function.
- the object-side surface of the spectacle lens 1 includes the base surface 11 and a plurality of defocus surfaces 12.
- the plurality of defocus surfaces 12 are formed, for example, in a circular shape in a plan view, as shown in FIG. It is located.
- the defocus surfaces 12 are arranged discretely (that is, they are not continuous, but scattered).
- the case where all of the defocus surfaces 12 are arranged in an island shape is illustrated here, the case is not limited to this, and the outer edges of adjacent regions may be connected or in contact with each other.
- Each defocus surface 12 may be arranged in the other direction. In either case, it is preferable that the arrangement of each defocus surface 12 has periodicity. Thereby, discomfort such as blurring in a specific direction can be suppressed, and the wearing comfort of the spectacle lens 1 can be improved.
- the number of defocus surfaces 12 arranged is not particularly limited, but is, for example, 20 or more and 500 or less.
- each of the plurality of defocus surfaces 12 may be formed over the entire lens area of the spectacle lens 1, for example, as shown in FIG. 6(a), but the present invention is not limited thereto.
- it may be formed to surround the lens center (geometric center, optical center, or centering center) of the spectacle lens 1, except for the area near the lens center.
- it may be partially formed in another partial area (for example, only in the area near the center of the lens).
- it may be formed in a predetermined area excluding the vicinity of the center and the vicinity of the outer edge of the spectacle lens 1.
- FIG. 7 is an explanatory diagram schematically illustrating the optical characteristics of a spectacle lens that exhibits a farsightedness reducing function.
- the spectacle lens 1 having the above-described configuration includes the base surface 11 and the plurality of defocus surfaces 12, thereby realizing the following optical characteristics.
- the base surface 11 is designed to achieve a refractive power appropriately designed based on the wearer's prescription so as to focus on the retina 32 at position A.
- the defocus surface 12 passes through the pupil 31 of the wearer's eyeball 30 to a position farther from the object side than the position A (i.e., The focus is set at position B), which is deeper on the retina than position A.
- the defocus surface 12 has a defocus power Ps that is different from the base surface 11 so that the focus is focused on the defocused position B from the position A, and this makes the defocus surface 12 different from the base surface 11. It is designed to achieve refractive power.
- focusing here means that the light is concentrated to form an image, but it does not necessarily have to be an aberration-free image, and it does not necessarily have to be an aberration-free image. It's okay.
- the base surface 11 of the spectacle lens 1 converges the light beam on the position A on the retina 32, while in the part where the defocus surface 12 is arranged, it Converge the light beam at position B.
- the spectacle lens 1 has a function of reducing farsightedness among the refractive errors of the wearer's eyes (that is, farsightedness reducing function).
- the surface shape of the base surface 11 i.e., the base surface shape
- the surface shape of the defocused surface 12 that is, the segment surface shape
- the refractive index of the lens base material constituting the spectacle lens 1 is N
- the power of the base surface 11 is Pb [D (diopter)]
- the defocus power of the defocus surface 12 is Ps [D].
- the refractive power [D] of the defocus surface 12 is expressed as Pb+Ps.
- the curvature [1/M] of the defocused surface 12 is expressed as (Pb+Ps)/(N-1).
- the refractive index N refers to the refractive index Ne at e-line (wavelength 546.1 nm).
- the minimum required defocus power Ps[D] is as follows in order to converge the light flux from position A to position B on the back side of the retina. It is defined by equation (1).
- the defocus surface 12 has a concave shape, in order to avoid any inconvenience in manufacturing the lens, it is conceivable to make the absolute values of the curvatures of the base surface 11 and the defocus surface 12 the same. . This is because if the respective curvatures are the same, the mold 20 can be processed with the same cutting tool.
- the power Pb of the base surface 11 is approximately 1 ⁇ Pb ⁇ 3
- the power Pb and the defocus power Ps are set to have a relationship defined by the following equation (2)′. Good too.
- the base is adjusted so that the power Pb of the base surface 11 and the defocus power Ps of the defocus surface 12 satisfy at least the relationship of -0.25Ps ⁇ Pb ⁇ -Ps.
- a surface shape and a segment surface shape are each set. Therefore, according to the spectacle lens 1 according to the present embodiment, even if the defocus surface 12 has a concave shape, it is possible to reliably perform the farsightedness reducing function and avoid any inconveniences in lens manufacturing. It becomes possible.
- the present invention is also applicable to a design method and manufacturing method of the spectacle lens 1.
- the design method of the eyeglass lens 1 is such that at least one of the two optical surfaces 2 and 3 on the object side and the eyeball side emits a light flux incident from the object side to the eyeball side, so that the light beam enters the eyeball at a position A on the retina 32 of the eyeball 30.
- the optical surface has a base surface 11 that makes the light beam incident from the object side converge to the eyeball side, and a plurality of defocus surfaces 12 that make the light beam incident from the object side exit toward the eyeball side and converge at a position B that is farther from the object side than the position A. 2 and 3.
- the power Pb of the base surface 11 and the defocus power Ps of the defocus surface 12 have a relationship of at least -0.25Ps ⁇ Pb ⁇ -Ps, more preferably -
- the base surface 11 and the defocus surface 12 are designed to satisfy the relationship 0.25Ps ⁇ Pb ⁇ -0.5Ps.
- the method for manufacturing the eyeglass lens 1 is also substantially the same, and the eyeglass lens 1 is manufactured through the above-mentioned steps. Note that steps other than those described here may be implemented using known techniques.
- the spectacle lens 1 according to the present embodiment can be obtained by using the design method or manufacturing method of the spectacle lens 1 as described above.
- the spectacle lens 1 has a base surface 11 and a plurality of defocus surfaces 12, and while the base surface 11 converges the light beam to a position A on the retina 32, the defocus surface 12 The light beam is converged from position A to position B on the back side of the retina 32.
- the spectacle lens 1 has a function of reducing farsightedness among the refractive errors of the wearer's eyes (that is, farsightedness reducing function).
- the spectacle lens 1 is configured such that the power Pb of the base surface 11 and the defocus power Ps of the defocus surface 12 satisfy the relationship of at least -0.25Ps ⁇ Pb ⁇ -Ps.
- a base surface shape and a segment surface shape are each set. Therefore, even if the defocus surface 12 has a concave shape, with the aspect of this embodiment, it is possible to avoid problems in manufacturing the lens.
- the local recesses on the lens surface of the spectacle lens 1 are suitable for realizing the hyperopia reduction function. Become.
- the base surface shape and the segment surface shape are set such that the base surface 11 and the defocus surface 12 satisfy the relationship described below. are set respectively.
- a person wearing a spectacle lens may face another person while maintaining a certain distance (for example, a distance of about 2 meters that should be maintained as a social distance) (see FIG. 3).
- a certain distance for example, a distance of about 2 meters that should be maintained as a social distance
- the defocus surface 12 has a concave shape
- the light be condensed and converted into diverging light (see FIG. 3(b)). This is because if the reflected light from the outside light is changed to diverging light, the other person facing the eyeglass lens 1 will not feel dazzled, and any inconveniences in appearance of the spectacle lens 1 can be avoided.
- the power Pb of the base surface 11, the defocus power Ps of the defocus surface 12, and the refractive index N of the lens base material on which the optical surfaces 2 and 3 are based are Pb
- the base surface shape and the segment surface shape are each set so as to satisfy the relationship of ⁇ -0.5(N-1)-Ps. Therefore, according to the spectacle lens 1 according to the present embodiment, even if the defocus surface 12 has a concave shape, it can reliably perform the function of reducing farsightedness, while preventing the appearance of the spectacle lens 1 from causing any inconvenience. It is possible to avoid this.
- this embodiment can also be applied to a method of designing or manufacturing a spectacle lens 1, as in the case of the first embodiment.
- the design method of the eyeglass lens 1 at least one of the two optical surfaces 2 and 3 on the object side and the eyeball side emits a light flux incident from the object side to the eyeball side so that the light beam is directed onto the retina 32 of the eyeball 30. It has a base surface 11 that converges on position A, and a plurality of defocus surfaces 12 that emit a luminous flux incident from the object side toward the eyeball side and converge on position B that is farther from the object side than position A.
- a step of designing the optical surfaces 2 and 3 is provided.
- the power Pb of the base surface 11, the defocus power Ps of the defocus surface 12, and the refractive index N of the lens base material on which the optical surfaces 2 and 3 are based are determined.
- Pb ⁇ -0.5(N-1)-Ps, the base surface 11 and the defocus surface 12 are designed to satisfy the following relationships.
- the method for manufacturing the spectacle lens 1 is also substantially the same.
- the base surface shape is adjusted so that the base surface 11 and the defocus surface 12 satisfy the relationship described below.
- the segment surface shape is set respectively.
- both the base surface shape and the segment surface shape it is advantageous for both the base surface shape and the segment surface shape to have a small sag amount (see FIG. 4).
- the defocus surface 12 has a concave shape
- the defocus surface 12 when measuring the position of the defocus surface 12, it is preferable that the defocus surface 12 has a segment surface shape that allows the minimum point to be specified (see FIG. 5).
- the arrangement pitch of the defocus surface 12 is L [mm] and the plane size of the defocus surface 12 is ⁇ [mm]
- the relationship between the power Pb of the base surface 11 and the defocus power Ps of the defocus surface 12 is can be expressed by the following equation (4).
- the arrangement pitch L is a value representing the size of the interval between the segment centers of the two defocus surfaces 12 that are arranged closest to each other.
- the plane size ⁇ is a value representing the plane size of the defocus surface 12, and for example, in the case of a plane circular shape, the diameter size corresponds to the plane size ⁇ .
- the power Pb of the base surface 11, the defocus power Ps of the defocus surface 12, the arrangement pitch L of the defocus surface 12, and the plane size ⁇ of the defocus surface 12 are , (-Ps ⁇ 2 )/L 2 ⁇ Pb, the base surface shape and the segment surface shape are respectively set. Therefore, according to the spectacle lens 1 according to the present embodiment, even if the defocus surface 12 has a concave shape, it is inconvenient to measure the shape of the spectacle lens 1 while reliably performing the hyperopia reduction function. It is possible to avoid this.
- the hyperopia reduction function is realized by the local recesses on the lens surface of the eyeglass lens 1. This makes it suitable for
- this embodiment can also be applied to a method of designing or manufacturing a spectacle lens 1, as in the case of the first embodiment or the second embodiment.
- the design method of the eyeglass lens 1 at least one of the two optical surfaces 2 and 3 on the object side and the eyeball side emits a light flux incident from the object side to the eyeball side so that the light beam is directed onto the retina 32 of the eyeball 30. It has a base surface 11 that converges on position A, and a plurality of defocus surfaces 12 that emit a luminous flux incident from the object side toward the eyeball side and converge on position B that is farther from the object side than position A.
- a step of designing the optical surfaces 2 and 3 is provided.
- the power Pb of the base surface 11, the defocus power Ps of the defocus surface 12, the arrangement pitch L of the defocus surface 12, and the plane size ⁇ of the defocus surface 12 are determined.
- the base surface 11 and the defocus surface 12 are designed so that (-Ps ⁇ 2 )/L 2 ⁇ Pb.
- the method for manufacturing the spectacle lens 1 is also substantially the same.
- At least one of the two optical surfaces on the object side and the eyeball side a base surface that emits a light flux incident from the object side to the eyeball side and converges it at a position A on the retina of the eyeball; a plurality of defocus surfaces that emit a light flux incident from the object side toward the eyeball side and converge it at a position B that is farther from the object side than the position A; It is composed of The power Pb of the base surface, the defocus power Ps of the defocus surface, and the refractive index N of the lens base material on which the optical surface is based satisfy Pb ⁇ -0.5(N-1)-Ps. Eyeglass lenses that satisfy relationships.
- At least one of the two optical surfaces on the object side and the eyeball side a base surface that emits a light flux incident from the object side to the eyeball side and converges it at a position A on the retina of the eyeball; a plurality of defocus surfaces that emit a light flux incident from the object side toward the eyeball side and converge it at a position B that is farther from the object side than the position A; It is composed of The power Pb of the base surface, the defocus power Ps of the defocus surface, the arrangement pitch L of the defocus surface, and the plane size ⁇ of the defocus surface are (-Ps ⁇ 2 )/L 2 Spectacle lenses that satisfy the relationship ⁇ Pb.
- each of the first to third embodiments described above is not limited to being implemented individually, and a plurality of them may be implemented in an appropriate combination. do not have.
- the defocus surface 12 may be disposed at a plurality of locations on the lens, and the manner in which the defocus surface 12 is disposed is not limited to a particular manner.
- the base surface 11 can have a shape designed based on prescription information of the wearer.
- the spectacle lens 1 has a prescription power (in a standard wearing state, substantially above the retina). It may be possible to exhibit a power determined to form an image.
- the shape of the defocus surface 12 can be similarly designed based on prescription information of the wearer.
- the effects of the present invention can be obtained by implementing the design measures specified in the claims.
- the base surface 11 and the defocus surface 12 are provided on the object side surface, but the present invention is not limited to this.
- many eyeglass lenses have a convex surface on the object side, so the base surface 11 and the defocus surface 12 can be provided on the object side surface.
- the base surface 11 and the defocus surface 12 may be arranged on the eyeball side surface.
- the spectacle lens 1 is configured by the object-side surface 2 and the eyeball-side surface 3; however, the present invention is not limited to this, and other aspects (for example, a lens having a polygonal bonding structure including a functional film such as a polarizing film inside the lens is also included within the technical scope of the present invention.
- the power provided by the base surface 11 and the defocus surface 12, and part or all of the defocus power can be recorded on either surface of the lens by engraving or the like. Further, at least a portion of other information regarding the lens (for example, wearer information described below) can also be recorded on the spectacle lens 1 by the same or different means.
- the spectacle lens 1 may be managed in a state where it is linked to wearer information regarding the wearer of the lens. That is, the eyeglass lens 1 and the wearer information may be handled as a lens product or may be traded. In that case, for example, wearer information may be recorded on a lens bag used in the lens transaction process, or may be recorded on a recording medium owned by a trader including an optician, or may be recorded on a storage medium that allows lenses to be verified. can be provided or conveyed by electronic communication lines.
- Wearer information may include prescription information for the wearer (e.g., spherical power, cylindrical power, astigmatism axis, etc.), or wear parameters (e.g., the wearer's interpupillary distance, wear time determined by the frame used). (anterior tilt angle, frame intercorneal distance, etc.).
- prescription information for the wearer e.g., spherical power, cylindrical power, astigmatism axis, etc.
- wear parameters e.g., the wearer's interpupillary distance, wear time determined by the frame used. (anterior tilt angle, frame intercorneal distance, etc.).
- the technical scope of the present invention includes the following spectacle lenses.
- It is composed of A spectacle lens, wherein the power Pb of the base surface and the defocus power Ps of the defocus surface satisfy the relationship -0.25Ps ⁇ Pb ⁇ -Ps.
- At least one of the two optical surfaces on the object side and the eyeball side a base surface that emits a light flux incident from the object side toward the eyeball side and converges it at position A; a plurality of defocus surfaces that emit a light flux incident from the object side toward the eyeball side and converge it at a position B that is farther from the object side than the position A; It is composed of The power Pb of the base surface, the defocus power Ps of the defocus surface, and the refractive index N of the lens base material on which the optical surface is based satisfy Pb ⁇ -0.5(N-1)-Ps. Eyeglass lenses that satisfy relationships.
- At least one of the two optical surfaces on the object side and the eyeball side a base surface that emits a light flux incident from the object side toward the eyeball side and converges it at position A; a plurality of defocus surfaces that emit a light flux incident from the object side toward the eyeball side and converge it at a position B that is farther from the object side than the position A; It is composed of The power Pb of the base surface, the defocus power Ps of the defocus surface, the arrangement pitch L of the defocus surface, and the plane size ⁇ of the defocus surface are (-Ps ⁇ 2 )/L 2 Spectacle lenses that satisfy the relationship ⁇ Pb.
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Abstract
Description
物体側と眼球側の二つの光学面の少なくとも一方が、
物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psとが、-0.25Ps<Pb<-Psの関係を満足する
眼鏡レンズである。
物体側と眼球側の二つの光学面の少なくとも一方が、
物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記光学面の基になるレンズ基材の屈折率Nとが、Pb<-0.5(N-1)-Psの関係を満足する
眼鏡レンズである。
物体側と眼球側の二つの光学面の少なくとも一方が、
物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記デフォーカス面の配置ピッチLと、前記デフォーカス面の平面サイズφとが、(-Ps×φ2)/L2<Pbの関係を満足する
眼鏡レンズである。
物体側と眼球側の二つの光学面の少なくとも一方について、物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、を有するように、前記光学面を設計する工程を備え、
前記光学面を設計する工程では、前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psとが、-0.25Ps<Pb<-Psの関係を満足するように、前記ベース面および前記デフォーカス面を設計する
眼鏡レンズの設計方法である。
物体側と眼球側の二つの光学面の少なくとも一方について、物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、を有するように、前記光学面を設計する工程を備え、
前記光学面を設計する工程では、前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記光学面の基になるレンズ基材の屈折率Nとが、Pb<-0.5(N-1)-Psの関係を満足するように、前記ベース面および前記デフォーカス面を設計する
眼鏡レンズの設計方法である。
物体側と眼球側の二つの光学面の少なくとも一方について、物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、を有するように、前記光学面を設計する工程を備え、
前記光学面を設計する工程では、前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記デフォーカス面の配置ピッチLと、前記デフォーカス面の平面サイズφとが、(-Ps×φ2)/L2<Pbの関係を満足するように、前記ベース面および前記デフォーカス面を設計する
眼鏡レンズの設計方法。
ここで、本発明の実施形態の説明に先立ち、発明者が得た知見について説明する。
図2は、遠視軽減機能を奏する眼鏡レンズの金型加工の一形態を示す説明図である。
金型加工にあたっては、例えば、金型において曲率が負かつ小さい(凹カーブがきつい)曲面形状については先丸バイトを用い、曲率が正または負であっても大きい(凸カーブまたは凹カーブが緩い)曲面形状については平バイトを用いるといったように、形成する曲面形状に応じて先端形状の異なるバイトを使い分けることが一般的である。そのため、例えば、図2(a)に示すように、金型20におけるベース面形状の対応部分とセグメント面形状の対応部分とが、平バイト21と先丸バイト22とを使い分ける必要がある関係である場合には、金型加工の生産性(効率)の低下を招くおそれがある。これに対し、図2(b)に示すように、金型20におけるそれぞれの対応部分を同一バイト23で加工可能であれば、生産性低下は抑制できる。しかしながら、生産性低下を抑制できても、仮に加工すべき曲面形状にバイト23の先端形状が適していないと、バイト23の送りピッチに従って周期的にできた加工痕が残ってしまうおそれがある。このような加工痕は、光の回折作用を起こして虹目と呼ばれる干渉色のような反射を見せる要因となる可能性があり、加工品質の低下を招き得るので、その発生を抑止すべきである。
つまり、ベース面形状とセグメント面形状との関係については、レンズ製造上の不都合を回避すべく、金型20を同一バイトで加工可能であり、しかもそのバイトの先端形状がそれぞれの曲面形状に適したものであることが好ましい。
図3は、遠視軽減機能を奏する眼鏡レンズの外観視の一形態を示す説明図である。
遠視軽減機能を奏する眼鏡レンズの装用者は、一定の距離間隔(例えば、ソーシャルディスタンスとして確保すべき2m程度の間隔)を保った状態で、他者と対面することがあり得る。その場合に、例えば、図3(a)に示すように、セグメント面を構成する凹形状の態様が、外光の反射光を対面する他者に集光させる態様のもの(例えば緩い凹カーブのもの)であると、対面する他者(すなわち、眼鏡レンズを外観視する者)が眩しさを感じてしまうといった不都合が生じ得る。
つまり、セグメント面を構成する凹形状の態様については、図3(b)に示すように、外光の反射光が対面する他者よりも手前側で集光して発散光に変わるようにするもの(例えばきつい凹カーブのもの)であることが好ましい。外光の反射光が発散光に変われば、対面する他者が眩しさを感じてしまうことがなく、眼鏡レンズの外観視上の不都合を回避し得るからである。
なお、このような現象は、凹形状ならではのものであり、図3(c)に示すように、セグメント面が凹形状以外(凸形状や平坦形状等)であれば問題とはならない。
図4は、遠視軽減機能を奏する眼鏡レンズの形状測定の一形態を示す説明図である。図5は、遠視軽減機能を奏する眼鏡レンズの形状測定の他の一形態を示す説明図である。
眼鏡レンズの表面形状の形状測定は、例えば、白色干渉計を用いて行う。白色干渉計は、表面の凹凸によって生じる光路差で得られる干渉縞の情報を高さ情報に変換することで、表面形状の形状測定を行う。ただし、白色光の干渉深度は、2μm程度と狭い。そのため、例えば、図4(a)に示すようなベース面形状のサグ量が大きい場合や、図4(b)に示すようなセグメント面形状のサグ量が大きい場合には、形状測定に用いる白色干渉計の深度では表面形状を検出できないといった不都合が生じてしまうおそれがある。つまり、白色干渉計の深度によらず形状測定を行えるようにするためには、図4(c)に示すように、ベース面形状とセグメント面形状とのいずれもサグ量が小さいほうが有利である。
眼鏡レンズの表面におけるセグメント面の位置測定に際しては、例えば、図5(a)に示すように、ベース面とセグメント面との境界位置を手掛かりにして当該セグメント面の中心位置を特定することが考えられる。しかしながら、その場合には、境界位置がダレていると中心位置が正しく分からなくなるといった不都合が生じてしまうおそれがある。したがって、セグメント面の中心位置は、図5(b)に示すように、境界位置に加えてセグメント面の極小点も加味した上で特定することが好ましい。つまり、セグメント面の中心位置を正しく特定し得るようにするためには、極小点を特定し得るセグメント面形状である必要がある。
以上のように、形状測定を行う上での不都合を回避するためには、ベース面形状とセグメント面形状との関係が、いずれもサグ量が小さく、しかも極小点を特定し得るセグメント面形状であることが好ましい。
まず、本発明の第1実施形態について説明する。
本実施形態に係る眼鏡レンズ1は、図1に示すように、物体側の面2と眼球側の面3とを二つの光学面として有する。「物体側の面」は、眼鏡レンズ1を備えた眼鏡が装用者に装用された際に物体側に位置する表面である。「眼球側の面」は、その反対、すなわち眼鏡レンズ1を備えた眼鏡が装用者に装用された際に眼球側に位置する表面である。
ハードコート膜は、例えば、熱可塑性樹脂またはUV硬化性樹脂を用いて形成されている。ハードコート膜は、ハードコート液にレンズ基材を浸漬させる方法や、スピンコート等を使用することにより、形成することができる。このようなハードコート膜の被覆によって、眼鏡レンズ1の耐久性向上が図れるようになる。
反射防止膜は、例えば、ZrO2、MgF2、Al2O3等の反射防止剤を真空蒸着により成膜することにより、形成されている。このような反射防止膜の被覆によって、眼鏡レンズ1を透した像の視認性向上が図れるようになる。
ベース面11は、装用者の処方屈折力に基づいて設計されたレンズ上の領域部分を構成する面である。ベース面11を有することで、本実施形態に係る眼鏡レンズ1は、物体側からベース面11に入射した光束を、眼球側の面3から出射させ、装用者の眼球の瞳孔を介して網膜上の所定の位置(位置A)に収束させるように構成されている。
複数のデフォーカス面12は、それぞれが、ベース面11とは異なる度数のセグメント面として機能するように設計されたレンズ上の領域部分を構成する面である。デフォーカス面12を有することで、本実施形態に係る眼鏡レンズ1は、物体側からデフォーカス面12に入射した光束を、眼球側の面3から出射させ、装用者の眼球の瞳孔を介して位置Aよりも物体側から離れた位置(すなわち、位置Aより網膜の奥側の位置B)に収束させるように構成されている。
ここで、ベース面11の度数Pbは、ベース面11のカーブを単位:D(ディオプタ)で表したものであり、Pb=1000/{曲率半径×(屈折率-1)}の関係を満足するものである。
また、デフォーカス面12のデフォーカス度数Psは、単なる「度数」ではなく「デフォーカス度数」と称していることから、デフォーカス面12のカーブのベース面11に対する乖離を単位:D(ディオプタ)で表したものである。つまり、デフォーカス度数Psは、デフォーカス面12におけるベース面11との相対的な差分に相当する。したがって、Pb+Psがデフォーカス面12の度数となる。
上述のように、本実施形態において、眼鏡レンズ1の物体側の面は、ベース面11と、複数のデフォーカス面12と、を備えて構成されている。
これらのうち、複数のデフォーカス面12は、図6に示すように、例えば、平面視で円形状に形成されており、それぞれが島状に(つまり、互いに隣接することなく離間した状態で)配置されている。つまり、各デフォーカス面12は、それぞれが離散的(すなわち、それぞれが連続しておらず、ばらばらに散らばった状態で)配置されている。ただし、ここでは、各デフォーカス面12の全てが島状に配置される場合を例示するが、これに限定されることはなく、隣り合う領域の外縁同士が連結する、あるいは接するものを含むように各デフォーカス面12が配置されていてもよい。いずれの場合においても、各デフォーカス面12の配置態様は、周期性を有することが好ましい。これにより、特定の方向にぼやける等の不快感を抑制し、眼鏡レンズ1の装用感を向上させることができる。なお、デフォーカス面12の配置個数は、特に限定されないが、例えば、20個以上500個以下である。
次に、上述した構成の眼鏡レンズ1の光学特性について説明する。
図7は、遠視軽減機能を奏する眼鏡レンズの光学特性を模式的に例示する説明図である。
例えば、図7(a)に示すように、ベース面11を通過した光は、装用者の眼球30の瞳孔31を介して網膜32上の位置Aに焦点を結ぶ。つまり、ベース面11は、位置Aである網膜32上に焦点を結ぶように、装用者の処方を基に適宜設計された屈折力を実現するようになっている。
次に、以上のような光学特性を有する眼鏡レンズ1のデフォーカス面12について、その面形状の具体的な態様を説明する。
本発明は、眼鏡レンズ1の設計方法、または、製造方法にも適用可能である。
本実施形態によれば、以下に示す1つまたは複数の効果を奏する。
次に、本発明の第2実施形態について説明する。なお、ここでは、主として第1実施形態の場合との相違点について説明する。
例えば、眼鏡レンズ1の設計方法であれば、物体側と眼球側の二つの光学面2,3の少なくとも一方について、物体側から入射した光束を眼球側へ出射させて眼球30の網膜32上の位置Aに収束させるベース面11と、物体側から入射した光束を眼球側へ出射させて位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面12と、を有するように、光学面2,3を設計する工程を備える。そして、光学面2,3を設計する工程では、ベース面11の度数Pbと、デフォーカス面12のデフォーカス度数Psと、光学面2,3の基になるレンズ基材の屈折率Nとが、Pb<-0.5(N-1)-Psの関係を満足するように、ベース面11およびデフォーカス面12を設計する。
眼鏡レンズ1の製造方法についても略同様である。
次に、本発明の第3実施形態について説明する。なお、ここでも、主として第1実施形態または第2実施形態の場合との相違点について説明する。
例えば、眼鏡レンズ1の設計方法であれば、物体側と眼球側の二つの光学面2,3の少なくとも一方について、物体側から入射した光束を眼球側へ出射させて眼球30の網膜32上の位置Aに収束させるベース面11と、物体側から入射した光束を眼球側へ出射させて位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面12と、を有するように、光学面2,3を設計する工程を備える。そして、光学面2,3を設計する工程では、ベース面11の度数Pbと、デフォーカス面12のデフォーカス度数Psと、デフォーカス面12の配置ピッチLと、デフォーカス面12の平面サイズφとが、(-Ps×φ2)/L2<Pbの関係を満足するように、ベース面11およびデフォーカス面12を設計する。
眼鏡レンズ1の製造方法についても略同様である。
以上に本発明の各実施形態を説明したが、本発明の技術的範囲は、上述の例示的な開示内容に限定されるものではなく、その要旨を逸脱しない範囲で種々変更可能である。
物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psとが、-0.25Ps<Pb<-Psの関係を満足する
眼鏡レンズ。
また、例えば、物体側と眼球側の二つの光学面の少なくとも一方が、
物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記光学面の基になるレンズ基材の屈折率Nとが、Pb<-0.5(N-1)-Psの関係を満足する
眼鏡レンズ。
また、例えば、物体側と眼球側の二つの光学面の少なくとも一方が、
物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記デフォーカス面の配置ピッチLと、前記デフォーカス面の平面サイズφとが、(-Ps×φ2)/L2<Pbの関係を満足する
眼鏡レンズ。
つまり、ベース面11は、装用者の処方情報を基に設計された形状を有するものとすることができる。例えば、ベース面11(例えば物体側面)と、これに対向する他方の面(たとえば眼球側の面)を備えることによって、眼鏡レンズ1は、処方度数(標準的装用状態で、実質的に網膜上に結像するように決定された度数)を発揮するものとすることができる。また、デフォーカス面12の形状についても、同様に装用者の処方情報を基に設計された形状とすることができる。そのうえで、請求項に規定された設計上の工夫を行うことで、本発明の作用効果が得られる。
一般に、多くの眼鏡レンズは、物体側に凸面を有するので、その物体側の面に、ベース面11およびデフォーカス面12を設けることができる。ただし、眼球側の面に凸面を有する場合には、その眼球側の面に、ベース面11およびデフォーカス面12を配置してもよい。
その場合に、例えば、装用者情報は、レンズの取引過程で使用される、レンズ袋に記録され、又は、眼鏡店を含む取引業者の有する記録媒体に記録され、又は、レンズの照合が可能な状態で、電子通信回線によって提供され、又は伝達されることができる。
装用者情報は、当該装用者の処方情報(例えば、球面度数、円柱度数、乱視軸など)を含んでもよく、又は、装用パラメータ(装用者の瞳孔間距離、使用するフレームにより決定される装用時前傾角、フレーム角膜間距離など)を含んでもよい。
例えば、物体側と眼球側の二つの光学面の少なくとも一方が、
物体側から入射した光束を眼球側へ出射させて位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psとが、-0.25Ps<Pb<-Psの関係を満足する
眼鏡レンズ。
また、例えば、物体側と眼球側の二つの光学面の少なくとも一方が、
物体側から入射した光束を眼球側へ出射させて位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記光学面の基になるレンズ基材の屈折率Nとが、Pb<-0.5(N-1)-Psの関係を満足する
眼鏡レンズ。
また、例えば、物体側と眼球側の二つの光学面の少なくとも一方が、
物体側から入射した光束を眼球側へ出射させて位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記デフォーカス面の配置ピッチLと、前記デフォーカス面の平面サイズφとが、(-Ps×φ2)/L2<Pbの関係を満足する
眼鏡レンズ。
Claims (6)
- 物体側と眼球側の二つの光学面の少なくとも一方が、
物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psとが、-0.25Ps<Pb<-Psの関係を満足する
眼鏡レンズ。 - 物体側と眼球側の二つの光学面の少なくとも一方が、
物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記光学面の基になるレンズ基材の屈折率Nとが、Pb<-0.5(N-1)-Psの関係を満足する
眼鏡レンズ。 - 物体側と眼球側の二つの光学面の少なくとも一方が、
物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、
物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、
を有して構成されており、
前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記デフォーカス面の配置ピッチLと、前記デフォーカス面の平面サイズφとが、(-Ps×φ2)/L2<Pbの関係を満足する
眼鏡レンズ。 - 物体側と眼球側の二つの光学面の少なくとも一方について、物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、を有するように、前記光学面を設計する工程を備え、
前記光学面を設計する工程では、前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psとが、-0.25Ps<Pb<-Psの関係を満足するように、前記ベース面および前記デフォーカス面を設計する
眼鏡レンズの設計方法。 - 物体側と眼球側の二つの光学面の少なくとも一方について、物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、を有するように、前記光学面を設計する工程を備え、
前記光学面を設計する工程では、前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記光学面の基になるレンズ基材の屈折率Nとが、Pb<-0.5(N-1)-Psの関係を満足するように、前記ベース面および前記デフォーカス面を設計する
眼鏡レンズの設計方法。 - 物体側と眼球側の二つの光学面の少なくとも一方について、物体側から入射した光束を眼球側へ出射させて眼球の網膜上の位置Aに収束させるベース面と、物体側から入射した光束を眼球側へ出射させて前記位置Aよりも物体側から離れた位置Bに収束させる複数のデフォーカス面と、を有するように、前記光学面を設計する工程を備え、
前記光学面を設計する工程では、前記ベース面の度数Pbと、前記デフォーカス面のデフォーカス度数Psと、前記デフォーカス面の配置ピッチLと、前記デフォーカス面の平面サイズφとが、(-Ps×φ2)/L2<Pbの関係を満足するように、前記ベース面および前記デフォーカス面を設計する
眼鏡レンズの設計方法。
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US10442774B1 (en) * | 2012-11-06 | 2019-10-15 | Valve Corporation | Adaptive optical path with variable focal length |
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JP2021157126A (ja) * | 2020-03-30 | 2021-10-07 | ホヤ レンズ タイランド リミテッドHOYA Lens Thailand Ltd | 眼鏡レンズ |
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US10442774B1 (en) * | 2012-11-06 | 2019-10-15 | Valve Corporation | Adaptive optical path with variable focal length |
WO2020067028A1 (ja) | 2018-09-28 | 2020-04-02 | ホヤ レンズ タイランド リミテッド | 曲面形状評価方法、眼鏡レンズの製造方法および眼鏡レンズ |
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