WO2024117101A1 - Lentille de polarisation - Google Patents

Lentille de polarisation Download PDF

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Publication number
WO2024117101A1
WO2024117101A1 PCT/JP2023/042449 JP2023042449W WO2024117101A1 WO 2024117101 A1 WO2024117101 A1 WO 2024117101A1 JP 2023042449 W JP2023042449 W JP 2023042449W WO 2024117101 A1 WO2024117101 A1 WO 2024117101A1
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region
lens
degree
along
curvature
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PCT/JP2023/042449
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English (en)
Japanese (ja)
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能拓 安田
隆二 渡辺
浩一 安田
和也 高島
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株式会社ウインテック
能拓 安田
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Publication of WO2024117101A1 publication Critical patent/WO2024117101A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/12—Polarisers

Definitions

  • This disclosure relates to polarized lenses used, for example, in sunglasses, goggles, etc.
  • sunglasses 100 include a pair of lens balls 101 and a frame 102 into which the pair of lens balls 101 are attached.
  • Frame 102 has a pair of lens frames 103 into which lens balls 101 are fitted.
  • Lens balls 101 are manufactured by cutting a polarized lens to fit the shape of lens frames 103.
  • Polarized lenses are manufactured, for example, by bending a horizontally elongated laminate in which polycarbonate support plates are laminated on both sides of a polarizing film.
  • the frame 102 is designed with a width greater than a height to be fashionable, and the lens frame 103 is curved significantly in the left-right direction to accommodate light incident not only from the front but also from the side. Therefore, the lens ball 101 must also be curved significantly to match the curvature of the lens frame 103.
  • a spherically curved polarized lens is known in which the degree of curvature along the horizontal axis and the degree of curvature along the vertical axis (the direction perpendicular to the polarization axis) are both set to 8R.
  • a curvature of "1R” means that the focal length is 1m and the refractive power is 1.00, and if the polarized lens is made of glass, the radius of curvature is 523mm.
  • the value that represents the magnitude of this curvature is inversely proportional to the radius of curvature, so the smaller the value, the gentler the curve, and the larger the value, the steeper the curve.
  • a spherically curved lens ball 101 in which the degree of curvature along the horizontal axis and the vertical axis are both set to 6R, and the lens frame 103 of the frame 102 in which this lens ball 101 can be attached has reduced curvature along the left-right direction.
  • a polarized lens that is highly curved into an 8R x 8R spherical shape has a large difference between the degree of curvature of the convex surface on the front side and the concave surface on the back side.
  • This increases the refractive power of light, so if lenses made from this polarized lens are used in sunglasses, it can have a detrimental effect on the eyes, affecting vision and causing eye fatigue.
  • Reducing the thickness of the polarized lens can reduce the refractive power of light, but this also reduces the strength of the lens.
  • Reducing the degree of curvature of the polarized lens can also reduce the refractive power of light, but this also makes the curvature of the lens more gentle, making it difficult to fit the lens into a frame with a highly curved lens frame.
  • the present disclosure aims to address the above-mentioned issues and provide polarized lenses for producing lenses that have low optical refractive power and can be attached to existing frames.
  • a polarized lens that reduces the refractive power of light at least in the area of the polarized lens where the user's pupil hits, suppresses adverse effects on the eyes, and can be fitted to frames that are compatible with existing spherically curved polarized lenses, by adjusting the degree of curvature along the horizontal axis and the degree of curvature along the vertical axis in the assumed eye point area that exists inward from the center of the lens along the horizontal axis according to the refractive index of the polarized lens material and the thickness of the polarized lens, while taking the degree of curvature of a spherically curved polarized lens as a base.
  • the polarized lenses disclosed herein are directed to the polarized lenses described in Section 1 below.
  • a polarized lens for single-eye use that is curved so that the front side is convex and the back side is concave, the degree of curvature along the horizontal axis and the vertical axis of at least the eye point region in a region inside the lens center, which is the intersection of the horizontal axis and the vertical axis, is smaller than the degree of curvature along the horizontal axis and the vertical axis of a region outside the lens center, the assumed eyepoint region is a virtual region that can be obtained by moving a virtual circle having a diameter of 20 mm in the inner region so that the center of the virtual circle reaches a position that is a first distance d1 away from the lens center in the horizontal axis direction to a position that is a second distance d2 away from the lens center, the first distance D1 being 8 mm or more and 11 mm or less, and the second distance D2 being 18 mm or more and 21 mm or less, A polarizing lens in which the spherical power of the assumed
  • the polarized lenses disclosed herein also include the polarized lenses described in Item 2 below as preferred embodiments of the polarized lenses described in Item 1 above.
  • the outer region is divided along the direction of the horizontal axis into a central region on the lens center side and a side region on the outer edge side of the polarizing lens, Item 2.
  • the polarized lens according to item 1 wherein the degree of curvature of the central region along the direction of the horizontal axis is smaller than the degree of curvature of the side regions along the direction of the horizontal axis.
  • the polarized lenses of the present disclosure also include the polarized lenses described in the following item 3 as preferred embodiments of the polarized lenses described in items 1 and 2 above.
  • the inner region is divided into an inner first region, an inner second region, and an inner third region from the horizontal axis toward the upper edge and the lower edge of the polarizing lens, the degree of bending along the longitudinal axis direction increases in the order of the inner first region, the inner second region, and the inner third region; Item 3.
  • the polarized lenses of the present disclosure also include the polarized lenses described in the following item 4 as preferred embodiments of the polarized lenses described in the above item 3.
  • Item 4 The polarized lens according to item 3, in which the degree of curvature of the first inner region along the vertical axis and the degree of curvature of the inner region along the horizontal axis are equal.
  • the polarized lenses disclosed herein also include the polarized lenses described in Item 5 below as preferred embodiments of the polarized lenses described in Item 2 above.
  • the central region is divided into a central first region and a central second region from the horizontal axis toward the upper edge and the lower edge of the polarizing lens, 3.
  • the polarized lens according to item 2 wherein the degree of curvature of the central second region along the direction of the vertical axis is greater than the degree of curvature of the central first region along the direction of the vertical axis.
  • the polarized lenses of the present disclosure also include the polarized lenses described in the following item 6 as preferred embodiments of the polarized lenses described in items 2 and 5 above.
  • Item 6 A polarized lens according to item 2 or 5, in which the degree of curvature of the side region along the horizontal axis and the degree of curvature of the side region along the vertical axis are equal.
  • the polarized lenses of the present disclosure also include the polarized lenses described in the following item 7 as preferred embodiments of the polarized lenses described in items 1 to 6 above.
  • Item 7 The polarizing lens according to any one of items 1 to 7, in which the astigmatism power of the assumed eyepoint area is 0.12 or less.
  • the polarized lenses of the present disclosure also include the polarized lenses described in the following item 8 as preferred embodiments of the polarized lenses described in items 1 to 7 above.
  • the polarizing lens according to any one of items 1 to 7,
  • the polarizing lens is composed of a laminate in which polycarbonate support plates are laminated on both sides of a polarizing film,
  • the thickness of the polarized lens is 0.9 mm
  • the curvature degree of the curved surface along the horizontal axis direction of the eyepoint assumed area and the curvature degree of the curved surface along the vertical axis direction are 6R or less
  • a polarized lens wherein the degree of curvature of the curved surface of the side region in the outer region along the horizontal axis and the degree of curvature of the curved surface along the vertical axis are 8R.
  • the polarized lenses of the present disclosure also include the polarized lenses described in the following item 9 as preferred embodiments of the polarized lenses described in items 1 to 7 above.
  • the polarizing lens according to any one of items 1 to 7,
  • the polarizing lens is composed of a laminate in which polycarbonate support plates are laminated on both sides of a polarizing film,
  • the thickness of the polarized lens is 1.5 mm
  • the curvature degree of the curved surface along the horizontal axis direction of the eyepoint assumed area and the curvature degree of the curved surface along the vertical axis direction are 5R or less
  • a polarized lens wherein the degree of curvature of the curved surface in the outer region along the horizontal axis of the side region and the degree of curvature of the curved surface in the vertical axis direction are 6R.
  • the polarized lens of the present disclosure maintains the degree of curvature of a spherically curved polarized lens at least in the outer region, while making the degree of curvature along the horizontal axis and the degree of curvature along the vertical axis in the inner region, where the eyepoint is expected to hit the user's pupil, smaller than in the outer region, to set the spherical power of the eyepoint expected region to between -0.12 and +0.12. This reduces the refractive power of light in the eyepoint expected region, so the polarized lens of the present disclosure can suppress adverse effects on the eyes and can be attached to frames that are compatible with existing spherically curved polarized lenses.
  • FIG. 1 is a perspective view of a polarizing lens.
  • FIG. 2 is a front view of a polarizing lens.
  • FIG. 3 is a perspective view of the laminate.
  • FIG. 4 is a vertical cross-sectional view of a portion of a polarizing lens.
  • FIG. 5(A) is a cross-sectional view of a polarizing lens
  • FIG. 5(B) is a vertical cross-sectional view of the inner region of the polarizing lens
  • FIG. 5(C) is a vertical cross-sectional view of the central region of the outer region of the polarizing lens.
  • FIG. 6 is a diagram for explaining an assumed eye point area.
  • FIG. 7 is a diagram illustrating a spectacle frame.
  • FIG. 8 is a perspective view of sunglasses.
  • the polarized lenses disclosed herein are used, for example, in sunglasses and goggles.
  • sunglasses and goggles One embodiment of the polarized lenses disclosed herein is described below with reference to the attached drawings.
  • FIGS. 1 and 2 show the appearance of polarizing lens 1.
  • Polarizing lens 1 is for monocular use.
  • the horizontal axis X of polarizing lens 1 is set in the direction of the polarization axis, and the vertical axis Y is set in a direction perpendicular to the polarization axis.
  • the intersection of horizontal axis X and vertical axis Y is the lens center C of polarizing lens 1.
  • the polarized lens 1 is formed by bending the laminate 11, which is elongated in the direction of the horizontal axis X shown in FIG. 3, multiple times while heating it.
  • the laminate 11 is subjected to a first bending process to form an intermediate product having a smaller degree of bending along the horizontal axis X and along the vertical axis Y than the final product, and then the intermediate product is subjected to a second bending process to make the degree of bending along the horizontal axis X and along the vertical axis Y greater than that of the intermediate product and the same as that of the final product, thereby manufacturing the polarized lens 1.
  • the bending process can be performed by a conventionally known method.
  • the outer shape of the laminate 11 is a horizontally elongated rectangular shape, but it does not necessarily have to be rectangular and may be, for example, elliptical.
  • the polarizing lens 1 and laminate 11 are structured by laminating support plates 13 on both sides of a polarizing film 12.
  • the thickness of the polarizing lens 1 and laminate 11 is not particularly limited, but is, for example, 0.9 mm or more and 1.5 mm or less.
  • the thickness of the polarizing lens 1 and laminate 11 can be measured, for example, using a film thickness meter or vernier calipers.
  • the polarizing film 12 is not particularly limited, but may be, for example, a dichroic dye oriented on a polymer film such as polyvinyl alcohol.
  • the thickness of the polarizing film 12 is not particularly limited, but may be, for example, 0.02 mm or more and 0.04 mm or less.
  • the support plate 13 is not particularly limited, but may be, for example, made of glass, polycarbonate (PC), acrylic resin (PMMA), polyamide resin (PA), triacetate, etc.
  • polarizing lens 1 is curved so that the front surface is convex 10A and the back surface is concave 10B.
  • polarizing lens 1 is curved so as to describe a smooth curve along the horizontal axis X in a cross-sectional view perpendicular to the vertical axis Y
  • polarizing lens 1 is curved so as to describe a smooth curve along the vertical axis Y in a cross-sectional view perpendicular to the horizontal axis X.
  • Polarizing lens 1 is curved in an aspheric shape, and the convex surface 10A on the front side and the concave surface 10B on the back side of polarizing lens 1 are aspheric.
  • the dashed dotted line indicates the outer shape of the lens ball formed by cutting away the outer periphery of the polarized lens 1 to fit a lens frame in, for example, a sunglasses frame.
  • the outer periphery of the polarized lens 1 is the portion having a predetermined width from the upper, lower, inner and outer edges of the polarized lens 1 toward the lens center C.
  • FIG. 1 shows a polarized lens for the left eye, with the right side of FIG. 1 corresponding to the temple side of the frame (the side closest to the user's ear) and the left side corresponding to the bridge side of the frame (the side closest to the user's nose).
  • the temple side of the polarized lens 1 is referred to as the "outside" and the bridge side as the "inside.”
  • the degree of curvature along the horizontal axis X of the region 2 inside the lens center C i.e., the region 2 from the vertical axis Y to the inner edge of the polarizing lens 1
  • the degree of curvature along the horizontal axis X of the region 3 outside the lens center C i.e., the region 3 from the vertical axis Y to the outer edge of the polarizing lens 1. Therefore, the inner region 2 of the polarizing lens 1 has a gentler curve along the horizontal axis X than the outer region 3.
  • the width of the inner region (length along the horizontal axis X) and the width of the outer region (length along the horizontal axis X) are approximately equal.
  • the dashed line indicates a state in which the polarizing lens 1 is curved along the horizontal axis X up to the inner region 2 with a degree of curvature along the horizontal axis X of the side region 31 in the outer region 3.
  • the degree of curvature along the horizontal axis X is preferably a constant value throughout the entire region, but does not necessarily have to be a constant value throughout the entire region.
  • a portion of the inner edge side of the polarized lens 1, or a portion of the upper edge side and/or lower edge side of the polarized lens 1 may have a steeper or gentler curve along the horizontal axis X than other portions.
  • the degree of curvature along the direction of the horizontal axis X preferably changes so as to increase from the lens center C toward the outer edge of the polarized lens 1.
  • the outer region 3 is divided into two regions: a central region 30 on the lens center C side, and a lateral region 31 on the outer edge side of the polarized lens 1.
  • the degree of curvature of the central region 30 along the direction of the horizontal axis X is smaller than the degree of curvature of the lateral region 31 along the direction of the horizontal axis X. Therefore, in the outer region 3, the central region 30 curves more gently along the direction of the horizontal axis X than the lateral region 31.
  • the degree of curvature of the polarized lens 1 along the horizontal axis X is preferably greatest in the side regions 31 of the outer region 3, next greatest in the central region 30 of the outer region 3, and least in the inner region 2. Therefore, the degree of curvature of the polarized lens 1 along the horizontal axis X varies so as to decrease from the outer edge of the polarized lens 1 to the lens center C and the inner edge of the polarized lens 1, and the curve along the horizontal axis X from the outer side to the inner side becomes gradually gentler.
  • the degree of curvature along the horizontal axis X is preferably a constant value throughout each region, but does not necessarily have to be a constant value throughout each region.
  • the curve along the horizontal axis X may be steeper or gentler for a portion of the upper edge and/or lower edge of the polarized lens 1 than for other portions.
  • the curve along the horizontal axis X may be steeper or gentler for a portion of the outer edge of the polarized lens 1 than for other portions.
  • the degree of curvature along the vertical axis Y preferably changes so as to increase from the horizontal axis X toward the upper and lower edges of the polarized lens 1.
  • the inner region 2 is divided into three regions, the inner first region 20, the inner second region 21, and the inner third region 22, from the horizontal axis X toward the upper and lower edges of the polarized lens 1.
  • the degree of curvature along the vertical axis Y increases in the order of the inner first region 20, the inner second region 21, and the inner third region 22.
  • the curve along the vertical axis Y is the gentlest in the inner first region 20
  • the curve along the vertical axis Y is steeper in the inner second region 21 than in the inner first region 20
  • the curve along the vertical axis Y is the steepest in the inner third region 22.
  • the vertical width (length along the vertical axis Y) of the first inner region 20, the vertical width (length along the vertical axis Y) of the second inner region 21, and the vertical width (length along the vertical axis Y) of the third inner region 22 are not particularly limited, but are generally equal.
  • the degree of bending along the direction of the vertical axis Y is preferably a constant value throughout each region, but does not necessarily have to be a constant value throughout the entire region.
  • the degree of curvature of the central region 30 along the vertical axis Y preferably changes so as to increase from the horizontal axis X toward the upper and lower edges of the polarized lens 1.
  • the central region 30 is divided into two regions, a central first region 300 and a central second region 301, from the horizontal axis X toward the upper and lower edges of the polarized lens 1.
  • the degree of curvature along the vertical axis Y increases in the order of the central first region 300 and the central second region 301. Therefore, in the central region 30, the curve along the vertical axis Y is steeper in the central second region 301 than in the central first region 30.
  • the vertical width (length along the vertical axis Y) of the central first region 300 and the vertical width (length along the vertical axis Y) of the central second region 301 are not particularly limited, but are generally equal.
  • the degree of bending along the direction of the vertical axis Y is preferably a constant value throughout each region, but does not necessarily have to be a constant value throughout the region.
  • the degree of bending along the direction of the vertical axis Y of the side region 31 is preferably a constant value throughout the entire region, but does not necessarily have to be a constant value throughout the entire region.
  • the degree of bending of the polarized lens 1 along the direction of the vertical axis Y is greatest in the lateral regions 31 of the outer region 3, and is preferably also greatest in the central second region 301 in the central region 30 of the outer region 3 and the inner third region 22 of the inner region 2.
  • the degree of bending of the polarized lens 1 along the direction of the vertical axis Y is preferably next greatest in the central first region 300 in the central region 30 of the outer region 3 and the inner second region 21 of the inner region 2.
  • the degree of bending of the polarized lens 1 along the direction of the vertical axis Y is preferably smallest in the inner first region 20 of the inner region 2.
  • the relationship between the degree of curvature along the horizontal axis X of the polarized lens 1 and the degree of curvature along the vertical axis Y is preferably such that the largest degrees of curvature are approximately equal in value, the next largest degrees of curvature are approximately equal in value, and the smallest degrees of curvature are approximately equal in value.
  • the degree of curvature along the horizontal axis X and the degree of curvature along the vertical axis Y are approximately equal, and the lateral regions 30 are highly curved and spherically curved.
  • the degree of curvature along the horizontal axis X and the degree of curvature along the vertical axis Y are approximately equal, and the central first region 300 is moderately curved and spherically curved.
  • the degree of curvature along the horizontal axis X and the degree of curvature along the vertical axis Y are approximately equal, and the central first region 20 is curved spherically with a small curve.
  • the inner region 2 includes an assumed eyepoint region 4, as shown in Figures 1 and 2.
  • the assumed eyepoint region 4 is a virtual region where it is assumed that the user's pupil will hit when the lens is attached to the frame.
  • the assumed eyepoint region 4 is set with reference to the fact that the distance between a person's left and right eyes is generally 32 mm.
  • a virtual circle 5 having a diameter of 20 mm is moved so that the center of the virtual circle 5 reaches a position from a position away from the lens center C in the direction of the horizontal axis X from a position away from the lens center C by a first distance D1 to a position away from the lens center C by a second distance D2.
  • the virtual region traced by the virtual circle 5 is the assumed eyepoint region 4.
  • the first distance D1 is 8 mm or more and 11 mm or less, preferably 9 mm or more and 11 mm or less, and most preferably 10 mm.
  • the second distance D2 is 18 mm or more and 21 mm or less.
  • the first distance D1 and the second distance D2 can be measured using a computer lens meter CL-2000 manufactured by Topcon Corporation.
  • the expected eyepoint region 4 is preferably included in the first inner region 20 of the inner region 2.
  • the expected eyepoint region 4 is included in the region of the polarized lens 1 where the degree of bending along the horizontal axis X and the degree of bending along the vertical axis Y are the smallest.
  • the spherical power is -0.12 or more and +0.12 or less, and preferably -0.09 or more and +0.09 or less.
  • the spherical power is expressed as (d1 + d2)/2, where d1 is the power of the refractive power of light caused by the difference in magnitude between the degree of curvature along the horizontal axis X of the convex surface on the front side of the polarizing lens 1 and the degree of curvature along the horizontal axis X of the concave surface on the back side, and d2 is the power of the refractive power of light caused by the difference in magnitude between the degree of curvature along the vertical axis Y of the convex surface on the front side of the polarizing lens 1 and the degree of curvature along the vertical axis Y of the concave surface on the back side.
  • a value of -0.12 or more and +0.12 or less is the pass standard, and the closer to zero the s
  • the spherical power mentioned above is determined mainly by the refractive index of the material (support plate 13) of polarizing lens 1, the thickness of polarizing lens 1, the degree of curvature (radius of curvature) of convex surface 10A on the front side of polarizing lens 1, and the degree of curvature (radius of curvature) of concave surface 10B on the back side of polarizing lens 1.
  • the refractive index of the material (support plate 13) of polarizing lens 1 the thickness of polarizing lens 1
  • the degree of curvature (radius of curvature) of convex surface 10A on the front side of polarizing lens 1 the degree of curvature (radius of curvature) of concave surface 10B on the back side of polarizing lens 1.
  • the spherical power of the assumed eyepoint area 4 is calculated based on these factors.
  • a polarizing lens 1 can be made using a 0.9 mm thick laminate 11 in which polycarbonate support plates 13 are laminated on both sides of a polarizing film 12, and the degree of curvature of the expected eyepoint area 4 along the horizontal axis X and along the vertical axis Y are both 6R or less.
  • the degree of curvature refers to the degree of curvature of the convex surface 10A on the front side of the polarizing lens 1.
  • polarized lens 1 can be designed with the degree of curvature shown in Example 1-2 in Table 1 below.
  • Polarized lens 1 having the degree of curvature shown in Example 1-2 can also be attached to existing frames that fit polarized lenses curved into a spherical shape of 8R x 8R, because the side regions 31 of the outer region 3 are curved into a spherical shape of 8R x 8R.
  • a polarizing lens 1 constructed using a 1.5 mm thick laminate 11 in which polycarbonate support plates 13 are laminated on both sides of a polarizing film 12, and in which the degree of curvature of the expected eyepoint area 4 along the horizontal axis X and along the vertical axis Y are both 5R or less.
  • the degree of curvature refers to the degree of curvature of the convex surface 10A on the front side of the polarizing lens 1.
  • polarized lens 1 can be designed with the degree of curvature shown in Example 3-4 of Table 2 below.
  • Polarized lens 1 having the degree of curvature shown in Example 3-4 has a 6R x 6R spherically curved side region of the outer region, and therefore can be attached to existing frames that fit 6R x 6R spherically curved polarized lenses.
  • the refractive index of polycarbonate (PC) is approximately 1.583, which is greater than the refractive index of glass (approximately 1.523), acrylic resin (PMMA) (approximately 1.492), and polyamide resin (PA) (approximately 1.530). Therefore, if polarized lens 1 is designed with the degree of curvature shown in Example 1-4 above, it is easy to recognize that the spherical power of the expected eyepoint area 4 can be made between -0.12 and +0.12 even if the material of the support plate 13 is not polycarbonate but, for example, glass, acrylic resin, polyamide resin, polyvinyl alcohol, etc.
  • the spherical power can be measured using measuring equipment conforming to ISO standards, such as a telescope, eyepiece, and measurement chart, with the polarizing lens 1 tilted horizontally and vertically, assuming that a lens ball made from the polarizing lens 1 is attached to a frame.
  • the telescope can be, for example, a LiNOS reading telescope (focusing range 1200 mm to infinity, axial observation, 1.2x magnification without eyepiece), the eyepiece can be, for example, a LiNOS eyepiece (10x magnification), and the measurement chart can be, for example, a 4.4 mm Power & Prism Chart.
  • the measurement chart can also be displayed on a computer using, for example, an ELECOM UVC WEB camera (maximum pixel count 1600 x 1200 pixels).
  • the astigmatism power is preferably 0.12 or less.
  • the astigmatism power represents the difference in refractive power between d1 and d2,
  • a smaller value of the astigmatism power is preferable, as it means that the distortion is smaller. Small lens distortion can prevent adverse effects on the user's eyes.
  • the astigmatism power can be calculated from the formula
  • the degree of curvature of at least the side regions 31 of the outer region 3 is maintained at the same level as that of a spherically curved polarized lens, for example 8R x 8R or 6R x 6R, while the degree of curvature along the horizontal axis X and along the vertical axis Y in the eyepoint assumed region 4 in the inner region 2, where the user's pupil is assumed to be, is made smaller than that of the outer region 3, and the spherical power of the eyepoint assumed region 4 is set to -0.12 or more and +0.12 or less, preferably -0.09 or more and +0.09 or less. This reduces the refractive power of light in the eyepoint assumed region 4, so that the polarized lens 1 of this embodiment can suppress adverse effects on the eyes and can be attached to frames that are compatible with existing spherically curved polarized lenses.
  • a spherically curved polarized lens for example 8R x 8R or 6R x 6R
  • the outer region 3 is divided along the horizontal axis X into a central region 30 on the lens center C side and a side region 31 on the outer edge side of the polarized lens 1, and the degree of curvature along the horizontal axis X of the central region 30 is smaller than the degree of curvature along the horizontal axis X of the side region 31. Therefore, according to the polarized lens 1 of this embodiment, the degree of curvature along the horizontal axis X changes so as to become smaller in stages from the outer edge of the polarized lens 1 to the lens center C to the inner edge of the polarized lens 1, and the curve along the horizontal axis X from the outside to the inside becomes gradually gentler. This allows the polarized lens 1 to be curved smoothly along the horizontal axis X.
  • the inner region 2 is divided into an inner first region 20, an inner second region 21, and an inner third region 22 from the horizontal axis X toward the upper and lower edges of the polarized lens 1, respectively, with the degree of curvature along the vertical axis Y increasing in the order of the inner first region 20, the inner second region 21, and the inner third region 22.
  • the central region 30 in the outer region 3 is divided into a central first region 300 and a central second region 301 from the horizontal axis X toward the upper and lower edges of the polarized lens 1, respectively, with the degree of curvature along the vertical axis Y of the central second region 301 being greater than the degree of curvature along the vertical axis Y of the central first region 300. Therefore, according to the polarized lens 1 of this embodiment, the degree of curvature along the vertical axis Y of the polarized lens 1 changes so as to become gradually smaller from the largest lateral region 31 of the outer region 3 to the smallest inner first region 20 of the inner region 2, with the curve along the vertical axis Y gradually becoming gentler. This allows the polarizing lens 1 to be smoothly curved along the direction of the vertical axis Y.
  • the astigmatism power in the assumed eyepoint region 4 is 0.12 or less. Therefore, with the polarized lens 1 of this embodiment, lens distortion is small, making it possible to suppress adverse effects on the user's eyes.
  • the polarized lens of the present disclosure is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present disclosure.
  • the polarized lens of Example 1 is a 0.9 mm thick laminated plate, in which a 0.4 mm thick polycarbonate support plate is laminated on both sides of a polarizing film, and curved into an aspheric shape by bending.
  • the size of the polarized lens is 80 mm in the horizontal axis direction and 60 mm in the vertical axis direction. As shown in FIG. 2, the polarized lens is divided into an inner region and an outer region with the center of the lens as the boundary.
  • the inner region is also divided into an inner third region, an inner second region, an inner first region, an inner second region, and an inner third region along the vertical axis between the upper edge and the lower edge of the polarized lens, and the lengths of the respective regions in the vertical axis direction are 10 mm, 10 mm, 20 mm, 10 mm, and 10 mm.
  • the outer region is divided into a central region and a side region, and the lengths of the respective regions in the horizontal axis direction are 20 mm and 20 mm.
  • the central region is divided into a central second region, a central first region, and a central second region between the upper edge and the lower edge along the vertical axis, and the lengths of these regions along the vertical axis are 20 mm, 20 mm, and 20 mm, respectively.
  • the eyepoint assumed region is a virtual region in the inner region that is created by moving a virtual circle with a diameter of 20 mm so that the center of the virtual circle reaches a position 10 mm away from the center of the lens in the horizontal axis direction to a position 21 mm away, and is included in the inner first region.
  • Example 1 Each region of the polarized lens in Example 1 has the degree of curvature shown in Example 1 of Table 1 above.
  • the polarized lens of Example 2 is a 1.5 mm thick laminated plate, in which a 0.7 mm thick polycarbonate support plate is laminated on both sides of a polarizing film, and is curved into an aspheric shape by bending.
  • the size of the polarized lens is 80 mm in the horizontal axis direction and 60 mm in the vertical axis direction. As shown in FIG. 2, the polarized lens is divided into an inner region and an outer region with the center of the lens as the boundary.
  • the inner region is also divided into an inner third region, an inner second region, an inner first region, an inner second region, and an inner third region along the vertical axis between the upper edge and the lower edge of the polarized lens, and the lengths of the respective regions in the vertical axis direction are 10 mm, 10 mm, 20 mm, 10 mm, and 10 mm.
  • the outer region is divided into a central region and a side region, and the lengths of the respective regions in the horizontal axis direction are 20 mm and 20 mm.
  • the central region is divided into a central second region, a central first region, and a central second region between the upper edge and the lower edge along the vertical axis, and the lengths of these regions along the vertical axis are 20 mm, 20 mm, and 20 mm, respectively.
  • the eyepoint assumption region is a virtual region in the inner region that is created by moving a virtual circle with a diameter of 20 mm so that the center of the virtual circle reaches a position 10 mm away from the center of the lens in the horizontal axis direction to a position 18 mm away, and is included in the inner first region.
  • Each region of the polarized lens of Example 2 has the degree of curvature shown in Example 3 of Table 2 above.
  • the polarized lens of Example 3 is a 1.1 mm thick laminated plate, in which a 0.5 mm thick polycarbonate support plate is laminated on both sides of a polarizing film, and curved into an aspheric shape by bending.
  • the size of the polarized lens is 80 mm in the horizontal axis direction and 60 mm in the vertical axis direction. As shown in FIG. 2, the polarized lens is divided into an inner region and an outer region with the center of the lens as the boundary.
  • the inner region is also divided into an inner third region, an inner second region, an inner first region, an inner second region, and an inner third region along the vertical axis between the upper edge and the lower edge of the polarized lens, and the lengths of the respective regions in the vertical axis direction are 10 mm, 10 mm, 20 mm, 10 mm, and 10 mm.
  • the outer region is divided into a central region and a side region, and the lengths of the respective regions in the horizontal axis direction are 20 mm and 20 mm.
  • the central region is divided into a central second region, a central first region, and a central second region between the upper edge and the lower edge along the vertical axis, and the lengths of these regions along the vertical axis are 20 mm, 20 mm, and 20 mm, respectively.
  • the eyepoint assumed region is a virtual region in the inner region that is created by moving a virtual circle with a diameter of 20 mm so that the center of the virtual circle reaches a position 10 mm away from the center of the lens in the horizontal axis direction to a position 21 mm away, and is included in the inner first region.
  • Each region of the polarized lens of Example 3 has the degree of curvature shown in Example 1 of Table 1 above.
  • the polarized lens of Comparative Example 1 is made by bending a 0.9 mm thick laminated plate, with 0.4 mm thick polycarbonate support plates laminated on both sides of a polarizing film, into a spherical shape with a curvature of 8R along both the horizontal and vertical axes.
  • the size of the polarized lens is 80 mm in the horizontal direction and 60 mm in the vertical direction.
  • the polarized lens of Comparative Example 2 is made by bending a 1.5 mm thick laminated plate, with 0.7 mm thick polycarbonate support plates laminated on both sides of a polarizing film, into a spherical shape with a curvature of 6R along both the horizontal and vertical axes.
  • the size of the polarized lens is 80 mm in length along the horizontal axis and 60 mm in length along the vertical axis.
  • the polarized lens of Comparative Example 3 is made by bending a 1.1 mm thick laminate with a 0.5 mm thick polycarbonate support plate laminated on both sides of a polarizing film into a spherical shape with a curvature of 8R along both the horizontal and vertical axes.
  • the size of the polarized lens is 80 mm in the horizontal direction and 60 mm in the vertical direction.
  • the spherical power and astigmatism power were measured using measuring equipment conforming to ISO standards at a position 10 mm inward from the center of the lens along the horizontal axis (see P1 in Figure 6(B)) and at a position 21 mm inward from the center of the lens along the horizontal axis (see P2 in Figure 6(B)).
  • the spherical power and astigmatism power were measured using measuring equipment conforming to ISO standards at a position 10 mm inward from the center of the lens along the horizontal axis (see P1 in Figure 6(B)) and at a position 18 mm inward from the center of the lens along the horizontal axis (see P2 in Figure 6(B)).
  • the spherical power and astigmatism power were measured using a measuring device conforming to ISO standards at a position 10 mm inward from the center of the lens along the horizontal axis (see P1 in Figure 6(B)) and at a position 21 mm inward from the center of the lens along the horizontal axis (see P2 in Figure 6(B)).
  • Tables 4 to 6 show that the aspherically curved polarized lenses of Examples 1-3 of the present disclosure have a spherical power in the expected eyepoint area that is within the range of ⁇ 0.12 and meets the ISO standard passing criteria, whereas the simply spherically curved polarized lenses of Comparative Examples 1-3 have a spherical power in the expected eyepoint area that is outside the range of ⁇ 0.12 and cannot meet the ISO standard passing criteria.
  • the aspherically curved polarized lenses of Examples 1-3 of the present disclosure have spherical powers at the lens center within the range of ⁇ 0.12, which meets the ISO standard passing criteria, whereas the simply spherically curved polarized lenses of Comparative Examples 1-3 have spherical powers at the lens center outside the range of ⁇ 0.12, which is confirmed to be unable to meet the ISO standard passing criteria.
  • the polarized lens was actually cut to the shape of the rim of the eyeglass frame and attached to the rim, and the spherical power and astigmatism power at the eye point position of the eyeglass frame were measured using measuring equipment conforming to ISO standards.
  • the polarized lens is a 1.1 mm thick laminated plate, with 0.5 mm thick polycarbonate support plates laminated on both sides of the polarizing film, which is then bent into an aspheric shape by bending.
  • the size of the polarized lens is 80 mm in the horizontal direction and 60 mm in the vertical direction. As shown in Figure 2, the polarized lens is divided into an inner region and an outer region, with the center of the lens as the boundary.
  • the inner region is also divided into an inner third region, an inner second region, an inner first region, an inner second region, and an inner third region along the vertical axis between the upper and lower edges of the polarized lens, with the lengths of the respective regions along the vertical axis being 10 mm, 10 mm, 20 mm, 10 mm, and 10 mm.
  • the outer region is divided into a central region and a side region, with the lengths of the respective regions along the horizontal axis being 20 mm and 20 mm.
  • the central region is divided into a central second region, a central first region, and a central second region between the upper edge and the lower edge along the vertical axis, and the lengths of these regions along the vertical axis are 20 mm, 20 mm, and 20 mm, respectively.
  • the eyepoint assumed region is a virtual region in the inner region that is created by moving a virtual circle with a diameter of 20 mm so that the center of the virtual circle reaches a position 10 mm away from the center of the lens in the horizontal axis direction to a position 21 mm away, and is included in the inner first region.
  • the spherical power and astigmatism power of the polarized lens before it is attached to the rim of the eyeglass frame are as shown in Table 8 below, and the spherical power in the expected eyepoint area (a position 8 mm to 21 mm inward from the center of the lens) is within the range of ⁇ 0.12.
  • the polarized lens was edge-cut so that the lens center coincided with the center of the rim of the eyeglass frame and matched the shape of the rim, and after cutting, it was attached to the rim of the eyeglass frame.
  • the eyeglass frame used was the eyeglass frame of Example 4-9 below, which has a general shape and size.
  • the eye point of the eyeglass frame is located 32 mm outward from the center of the bridge, assuming a human interpupillary distance of 64 mm.
  • Example 4 (Oakley eyeglass frame) ⁇ Bridge width: 20mm - Rim width: 60mm Temple inclination: 5° forward inclination Rim inclination: Front inclination 16° Horizontal inclination 25° - Rim curve: approx. 7R Eye point position: 8 mm inward from the center of the rim (center of the lens) (2)
  • Example 5 (Carrera eyeglass frame) ⁇ Bridge width: 20mm - Rim width: 62mm Temple inclination: forward inclination 8° Rim inclination: Front inclination 16° Horizontal inclination 25° - Rim curve: approx.
  • Example 8 (eyeglass frame manufactured by CLEAR LAKE) Bridge width: 22mm - Rim width: 62mm Temple inclination: forward inclination 7° Rim inclination: Front inclination 18° Horizontal inclination 26° - Rim curve: approx. 7R Eye point position: 10 mm inward from the center of the rim (center of the lens) (6)
  • Example 9 (Timberland eyeglass frame) Bridge width: 21mm - Rim width: 59mm Temple inclination: forward inclination 1° Rim inclination: Front inclination 16° Horizontal inclination 26° - Rim curve: approx. 7R Eye point position: 8 mm inward from the center of the rim (center of the lens)
  • the expected eyepoint area for a polarized lens is within a range of 8mm to 21mm inward from the center of the lens, when the polarized lens is cut to fit the shape of the rim of a typical eyeglass frame of a typical shape and size and attached to the rim, the actual eyepoint of the eyeglass frame coincides with the expected eyepoint area, and the spherical power at the eyepoint position is within a range of ⁇ 0.12, clearing the ISO standard passing criteria. It can therefore be seen that the polarized lens of the present invention can suppress adverse effects on the eyes.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Health & Medical Sciences (AREA)
  • Polarising Elements (AREA)

Abstract

Le but de la présente invention est de fournir une lentille de polarisation pour fabriquer une lentille qui a une faible puissance de réfraction de lumière et peut être montée sur des montures existantes. Le degré de courbe le long de la direction d'un axe horizontal X et le degré de courbe le long de la direction d'un axe vertical Y d'au moins une région de point d'œil 4 dans une région interne 2 à l'intérieur d'un centre de lentille C sont inférieurs au degré de courbe le long de la direction de l'axe horizontal X et le degré de courbe le long de la direction de l'axe vertical Y d'une région externe 3 à l'extérieur du centre de lentille C. Une région supposée de point d'œil 4 est une région virtuelle qui peut être formée par déplacement d'un cercle virtuel avec un diamètre de 20 mm dans la région interne 2 de telle sorte que le centre du cercle virtuel atteint une position à une seconde distance d2 d'une position à une première distance d1 du centre de lentille C dans la direction de l'axe horizontal X, la première distance D1 est de 8 à 11 mm, la seconde distance D2 est de 18 à 21 mm, et la puissance sphérique de la région supposée de point d'œil 4 est de -0,12 à +0,12.
PCT/JP2023/042449 2022-11-28 2023-11-28 Lentille de polarisation WO2024117101A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000171761A (ja) * 1998-12-07 2000-06-23 Wintec International Japan:Kk サングラス用偏光レンズおよびその製法並びにその製造装置
JP2006047586A (ja) * 2004-08-03 2006-02-16 Wintec International Japan:Kk 度付き偏光プラスチックレンズ用偏光シート、その偏光シートの製法、その偏光シートの製造装置、および度付き偏光プラスチックレンズ
JP2006301553A (ja) * 2005-03-25 2006-11-02 Optical Ventures Inc サングラス用レンズおよびその製法並びにその製造装置
JP2011180265A (ja) * 2010-02-26 2011-09-15 Yamamoto Kogaku Co Ltd １眼タイプ偏光眼鏡

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000171761A (ja) * 1998-12-07 2000-06-23 Wintec International Japan:Kk サングラス用偏光レンズおよびその製法並びにその製造装置
JP2006047586A (ja) * 2004-08-03 2006-02-16 Wintec International Japan:Kk 度付き偏光プラスチックレンズ用偏光シート、その偏光シートの製法、その偏光シートの製造装置、および度付き偏光プラスチックレンズ
JP2006301553A (ja) * 2005-03-25 2006-11-02 Optical Ventures Inc サングラス用レンズおよびその製法並びにその製造装置
JP2011180265A (ja) * 2010-02-26 2011-09-15 Yamamoto Kogaku Co Ltd １眼タイプ偏光眼鏡

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