Lens inspection sheet

Abstract

A lens inspection sheet for accurately identifying the geometric center of a multi-segment lens is provided. [Solution] A lens inspection sheet 10 used to inspect a multi-segment lens 30 provided in spectacles 40, the lens inspection sheet having a sheet body 12 that is translucent and can be attached to the surface of the multi-segment lens 30, and a mark 14 formed on the sheet body 12, the mark 14 having a circular portion 16 and a central portion 18 that indicates the center position of the circular portion 16, the circular portion 16 being visible on the multi-segment lens 30 when the sheet body 12 is attached with the central portion 18 aligned with the center of the multi-segment lens 30, and having a size such that the outer edge of the circular portion 16 is adjacent to the innermost lenslet row 34 of multiple lenslet rows 34 arranged concentrically.

Description

[Technical Field]

[0001] The present disclosure relates to a lens inspection sheet. [Background technology]

[0002] Patent Document 1 describes a method for identifying lens elements used in eyeglasses. In this method, fitting data for the eyeglasses is identified based on frame data representing an eyeglass frame to which the lens elements are attached and wearer data representing parameters of the wearer's face, and parameters of the optical elements in the lens elements are optimized based on the fitting data. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2024-527108 Summary of the Invention

[0004] The present disclosure relates to a lens inspection sheet used to inspect multi-segment lenses attached to eyeglasses, the lens inspection sheet comprising a translucent sheet body that can be attached to the surface of the multi-segment lens, and a mark formed on the sheet body, the mark comprising a circular portion and a central portion that indicates the center position of the circular portion, the circular portion being visible in the multi-segment lens when the sheet body is attached with the central portion coinciding with the center of the multi-segment lens, and having a size such that the outer edge of the circular portion is adjacent to the innermost lenslet among a plurality of lenslets arranged concentrically. [Brief explanation of the drawings]

[0005] [Figure 1] FIG. 1 is a diagram showing eyeglasses equipped with multi-segment lenses. [Figure 2] FIG. 2 is a diagram showing the positional relationship between the geometric center of the lens and the center of the pupil. [Figure 3] FIG. 1 is a plan view of a lens inspection sheet according to an example of the present disclosure. [Figure 4] 4 is a schematic view showing a cross section II of the lens inspection sheet shown in FIG. 3. FIG. [Figure 5A] FIG. 1 is a diagram showing the procedure for lens inspection, illustrating how the sheet body is attached to the lens to be inspected. [Figure 5B] FIG. 2 is a second diagram showing the procedure for lens inspection, showing a lens to be inspected with the sheet body attached. [Figure 5C] FIG. 3 shows the procedure for lens inspection, illustrating the procedure for determining whether the position of the geometric center of the lens being inspected coincides with the position of the center of the wearer's pupil as seen through the lens. [Figure 6] FIG. 10 is a plan view of a lens inspection sheet according to a modified example of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0006] An example of the present disclosure is described below. A lens inspection sheet according to one example of the present disclosure (hereinafter referred to as lens inspection sheet 10) is used to inspect multi-segment lenses (hereinafter referred to as multi-segment lenses 30) provided in spectacles. After explaining the multi-segment lenses 30, the configuration of the lens inspection sheet 10 and how to use it will be described below.

[0007] The lens inspection sheet of the present disclosure is not limited to the following embodiments, and may be modified or improved without departing from the spirit and scope of the present disclosure. Furthermore, the lens inspection sheet of the present disclosure may include equivalents.

[0008] [Multi-segment lens] The multi-segment lens 30 is a spectacle lens, and as shown in FIG. 1, is fitted into a spectacle frame 38 after being beveled to form a pair of glasses 40. The multi-segment lens 30 has a first surface and a second surface, each of which is aspherical or spherical. The first surface is the surface that faces the eyeball of a wearer wearing spectacles 40 having the multi-segment lens 30, and the second surface is the surface opposite the first surface, i.e., the surface that faces the object side when the spectacles 40 are worn by a wearer.

[0009] As shown in FIGS. 1 and 2, the multi-segment lens 30 has a circular central clear area 32, a plurality of lenslet rows 34, and an annular peripheral clear area 36.

[0010] The central clear region 32 is a transparent portion of the multi-segment lens 30 that has a smooth surface shape, and functions as a single-vision lens together with the peripheral clear region 36. In other words, the central clear region 32 directs a light beam that enters the second surface of the multi-segment lens 30 to exit the first surface of the multi-segment lens 30, enter the wearer's pupil, and converge on the retina. The surface shape of the central clear region 32 is not particularly limited, but may be, for example, a spherical shape. The diameter of the central clear region 32 is also not particularly limited, but may be, for example, approximately 9 mm.

[0011] Furthermore, in the multi-segment lens 30, which is circular before processing, the central clear area 32 is located in the center of the multi-segment lens 30. The center of the central clear area 32 corresponds to the geometric center of the multi-segment lens 30 (i.e., the geometric lens center).

[0012] Each of the multiple lenslet arrays 34 is annular regions arranged concentrically around the central clear region 11, and as shown in Fig. 1, is visible when the multi-segment lens 30 is viewed from a predetermined angle. Each lenslet array 34 is made up of multiple lenslets (optical elements) arranged in a circle, and the multiple lenslets cause a light beam incident on the second surface of the multi-segment lens 30 to exit from the first surface of the multi-segment lens 30, while preventing at least a portion of the light beam incident on the wearer's pupil from converging onto the retina. The surface shape of the lenslets is not particularly limited, and may be, for example, aspherical.

[0013] The peripheral clear region 36 is an annular region located between two adjacent lenslet rows 34 among the multiple concentrically arranged lenslet rows 34. Each peripheral clear region 36 performs the same function as the central clear region 32. Furthermore, because the peripheral clear region 36 is provided so as to surround the lenslet row 34, a minimum level of peripheral vision can be ensured.

[0014] [Lens inspection sheet configuration] According to the "Guidelines for Myopia Management Eyeglasses (Multi-Segment Lenses) (1st Edition)" created by the Myopia Management Eyeglasses Guideline Creation Committee, the center of central clear area 32 must coincide with the pupil center (i.e., eye point) of the wearer of eyeglasses 40 having multi-segment lenses 30 when the wearer looks straight ahead at a distance while maintaining a natural body and head posture. Therefore, when multi-segment lenses 30 are processed and attached to eyeglass frame 38, the geometric center of multi-segment lens 30 is centered relative to the pupil center of the wearer.

[0015] According to the above guidelines, the tolerance for centering is set to 1 mm or less in both the horizontal and vertical directions, and if this tolerance is not met, the lenses will need to be reprocessed or the eyeglass frame 38 will need to be adjusted.

[0016] For the above reasons, the distance between the geometric center and the pupil center of the multi-segment lens 30 provided in the spectacles 40 is inspected (more specifically, measured) in the horizontal and vertical directions, and when carrying out the inspection, it is necessary to accurately identify the geometric center of the multi-segment lens 30. The lens inspection sheet 10 is used as a tool for accurately identifying the geometric center of the multi-segment lens 30 when inspecting the multi-segment lens 30.

[0017] The lens inspection sheet 10 is a sheet-like member having a size that can be held by an inspector, and has a sheet body 12 and marks 14 as shown in FIG.

[0018] The sheet body 12 can be attached to the surface of the multi-segment lens 30, specifically, it can be attached to the first or second surface of the multi-segment lens 30 when it is attached to the eyeglasses 40, i.e., when it is fitted into the eyeglass frame 38 (see, for example, Figure 5A).

[0019] 4, an adhesive layer 22 is provided on the surface of the sheet body 12 that is attached to the surface of the multi-segment lens 30, and this adhesive layer 22 allows the sheet body 12 to be repeatedly attached in a detachable manner to the surface of the multi-segment lens 30. The material that makes up the adhesive layer 22 is not particularly limited as long as it has an adhesive strength that allows the sheet body 12 to be repeatedly attached in a detachable manner to the surface of the multi-segment lens 30, and for example, an acrylic adhesive may be used.

[0020] The sheet body 12 is translucent and is made of a material such as a transparent film. The color of the sheet body 12 is not particularly limited as long as it is translucent, and it may be colored, for example. However, it is more preferable that the main sheet body 12 is colorless and transparent. This allows the position of the wearer's pupils to be easily visible even when the eyeglasses 40 equipped with the segmented lenses 30 to which the main sheet body 12 is attached are worn by the wearer, i.e., even when the main sheet body 12 and the pupils of the wearer of the eyeglasses 40 overlap.

[0021] The lens inspection sheet 10 may further include a backing sheet (release paper) not shown. Specifically, the lens inspection sheet 10 may be a sheet in which the main sheet body 12 is attached to a backing sheet, that is, a sheet in which the main sheet body 12, the adhesive layer 22, and the backing sheet are laminated in this order. In this case, multiple main sheets 12 may be attached to one backing sheet; in other words, the lens inspection sheet 10 may include multiple main sheets 12.

[0022] To explain the seat body 12 in more detail, as shown in FIG. 3, the seat body 12 has a first portion 12a and a second portion 12b.

[0023] The first portion 12a has, for example, a circular shape, and a mark 14 is formed on its surface (the surface opposite to the adhesive layer 22). In the example shown in FIG. 3, the diameter (size) of the first portion 12a is the same as the diameter of a circular portion 16 of the mark 14, which will be described later. That is, the circular portion 16 is formed along the outer edge of the first portion 12a. However, this is not limited to this, and the diameter of the first portion 12a may be larger than the diameter of the circular portion 16. Furthermore, the shape of the first portion 12a is not limited to a circle, and may be, for example, a polygon, etc., as long as the size allows the circular portion 16 to be formed on the surface of the first portion 12a.

[0024] The second portion 12b is a separate portion from the first portion 12a and is a portion to be held by the user. The second portion 12b extends from the first portion 12a and has, for example, a substantially rectangular shape. The length, width, and shape of the second portion 12b are not particularly limited, and may be any length, width, and shape that allows the second portion 12b to be held by the user. The number of second portions 12b is also not limited, and for example, two second portions 12b may extend from the first portion 12a in opposite directions in a predetermined direction.

[0025] The mark 14 is a mark formed on the sheet body 12 (first portion 12a), and has a circular portion 16 and a central portion 18 indicating the center position of the circular portion 16, as shown in FIG.

[0026] Circular portion 16 is a circular mark. As shown in Fig. 5B, circular portion 16 is formed to correspond to the innermost lenslet row (hereinafter referred to as innermost lenslet row 34a) among the multiple lenslet rows 34 that are visible and arranged concentrically in multi-segment lens 30. In other words, circular portion 16 has a diameter that is the same as or slightly smaller than the diameter of the circle defined by the inner edge of innermost lenslet row 34a.

[0027] 5B, when the sheet body 12 is attached to the multi-segment lens 30 with the center position of the circular portion 16 (i.e., the center portion 18) coinciding with the center of the multi-segment lens 30, the circular portion 16 is sized so that the outer edge of the circular portion 16 is adjacent to the innermost lenslet row 34a. In other words, the circular portion 16 is sized so that it does not overlap with the innermost lenslet row 34a and there is no or only a small gap between the circular portion 16 and the innermost lenslet row 34a. For this reason, it is preferable that the difference in diameter between the circle defined by the inner edge of the innermost lenslet row 34a and the diameter of the circular portion 16 be in the range of 0 mm or more and 0.2 mm or less.

[0028] The line that depicts the circular portion 16 may be a solid line, a dashed line, or the like. In other words, the line that depicts the circular portion 16 may be a continuous line around the entire circumference, or an intermittent line with a portion of the circumference missing. The thickness of the line that depicts the circular portion 16 is not particularly limited, and may be any size that allows the outer edge of the circular portion 16 to be adjacent to the innermost lenslet row 34a.

[0029] As shown in FIG. 3 , the center portion 18 is configured, for example, as a circular dot 24 provided at the center of the circular portion 16. When the lens inspection sheet 10 is used as described below, the center portion 18 indicates the position of the geometric center of the multi-segment lens 30 (more specifically, the center of the central clear region 32). This makes it easy to find the geometric center of the multi-segment lens 30 when the lens inspection sheet 10 is used as described below. The shape of the dot 24 is not particularly limited, and marks other than circles, such as polygons and stars, may also be used. The size of the dot 24 is also not particularly limited, as long as it is large enough to clearly indicate the center position of the circular portion 16.

[0030] The means for forming the marks 14 on the sheet body 12 is not particularly limited, but the marks 14 may be formed on the sheet body 12 by, for example, printing, laser printing, transferring, embossing, laser marking, or the like.

[0031] Furthermore, it is preferable to form the marks 14 using a colored pigment or dye so that the marks 14 can be more clearly seen when the sheet body 12 is attached to the multi-segment lens 30. The color of the marks 14 is not particularly limited, and the marks 14 may be formed in colors such as magenta, red, purple, yellow, or white.

[0032] [How to use the lens inspection sheet] Next, a method of using the lens inspection sheet 10 having the above-described configuration, that is, a lens inspection method, will be described with reference to FIGS. 5A to 5C. The lens inspection using the lens inspection sheet 10 (hereinafter simply referred to as lens inspection) is carried out on the processed multi-segment lens 30 provided on the spectacles 40.

[0033] During lens inspection, an inspector first peels off the main sheet 12 of the lens inspection sheet 10 from the mount (not shown), and as shown in Fig. 5A, grasps the second portion 12b of the main sheet 12, and attaches the main sheet 12 to the second surface of the multi-segment lens 30. At this time, as shown in Fig. 5B, the main sheet 12 is attached to the second surface of the multi-segment lens 30 so that the outer edge of the circular portion 16 is adjacent to the innermost lenslet row 34a, that is, so that the circular portion 16 does not overlap the innermost lenslet row 34a and is positioned as close to the innermost lenslet row 34a as possible. The sheet body 12 may be attached to the first surface of the multi-segment lens 30 instead of the second surface.

[0034] 5C, the examiner has the wearer wear eyeglasses 40 equipped with multi-segment lenses 30 to which the main sheet 12 is attached, and then has the wearer look into the distance and straight ahead while maintaining a natural body and head posture. In this state, the examiner looks at dot 24 on the main sheet 12, which indicates the geometric center of multi-segment lenses 30, and at the wearer's pupil (pupil center P) as seen through the multi-segment lenses 30, and determines whether the positions of the two are aligned. More specifically, in accordance with the aforementioned guidelines, the examiner determines whether the distance between dot 24 and pupil center P is 1 mm or less in both the horizontal and vertical directions. If this is not the case, the examiner will rework the multi-segment lenses 30 or adjust the eyeglass frame 38.

[0035] According to the above procedure, by using the lens inspection sheet 10, the geometric center of the multi-segment lens 30 can be identified with high precision, and lens inspection can be performed with high precision.

[0036] To explain more specifically, let us assume that a mark similar to mark 14 on lens inspection sheet 10 (i.e., a mark corresponding to multiple circular portions 16 and center portion 18) is printed on a paper medium, and lens inspection is carried out using that paper medium.

[0037] As an example of the procedure in this case, the examiner first places a dotted mark (hereinafter referred to as mark A) on the multi-segment lens 30 with a water-based pen or the like at the position of the mark corresponding to the center 18, with the outer edge of the mark corresponding to the circular portion 16 printed on the paper medium next to the innermost lenslet row 34a. Next, the examiner has the wearer wear eyeglasses 40 equipped with the multi-segment lens 30 with mark A marked on it, and looks at mark A and the center of the wearer's pupil as seen through the multi-segment lens 30 to determine whether the positions of the two are aligned.

[0038] In this case, the surface of the multi-segment lens 30 is curved, while the paper medium on which the marks are printed is flat. Therefore, even if the outer edge of the mark corresponding to the circular portion 16 printed on the paper medium is aligned with the innermost lenslet row 34a, the mark A will be placed at a position slightly offset from the geometric center of the multi-segment lens 30. As a result, the geometric center of the multi-segment lens 30 may be identified at a position slightly offset.

[0039] In contrast, if the lens inspection sheet 10 is used, the sheet body 12 can be attached along the surface of the multi-segment lens 30, and the centers of the two can be precisely aligned by aligning the outer edge of the circular portion 16 with the innermost lenslet row 34a. This allows the geometric center of the multi-segment lens 30 to be identified with high precision. Furthermore, the sheet body 12 can be attached to the multi-segment lens 30 in a detachable manner, and therefore can be used for multiple lens inspections. Furthermore, by gripping the second portion 12b of the sheet body 12, the sheet body 12 can be easily attached to and detached from the multi-segment lens 30.

[0040] [Other disclosures] In the above disclosure, the central portion 18 is configured with dots 24 as shown in Fig. 3. However, the present invention is not limited to this, and the central portion 18 may have any shape as long as it can clearly indicate the center position of the circular portion 16, and may have, for example, the shape shown in Fig. 6.

[0041] In the lens inspection sheet 10A shown in FIG. 6, the center portion 18 is made up of multiple lines 26 (two in FIG. 6) that intersect at the center position of the circular portion 16. The two lines 26 intersect with each other to form a cross shape (X-shape) at the center portion 18. Note that each end of each line 26 may or may not reach the circular portion 16. This makes it possible, when the lens inspection sheet 10 is used in the manner described above, to easily find the center position of the circular portion 16, i.e., the geometric center of the multi-segment lens 30, from the intersection of the multiple lines 26. [Explanation of symbols]

[0042] 10,10A Lens inspection sheet 12 Seat body 12a Part 1 12b Part 2 14 marks 16 Circle 16a Innermost circle 18 Center 22 Adhesive layer 24 dots 26 lines 28 holes 30 Multi-segment Lens 32 Central clear area 34 Lenslet Array 34a Innermost lenslet row 36 Peripheral clear area 38 eyeglass frames 40 glasses P pupil center

Claims

1. A lens inspection sheet used to inspect multi-segment lenses provided in spectacles, a sheet body that is translucent and can be attached to the surface of the multi-segment lens; a mark formed on the sheet body, the mark includes a circular portion and a center portion indicating a center position of the circular portion, The circular portion is a lens inspection sheet having a size such that, when the sheet body is attached with the center aligned with the center of the multi-segment lens, the circular portion is visible in the multi-segment lens and the outer edge of the circular portion is adjacent to the innermost lenslet row among multiple lenslet rows arranged concentrically.

2. an adhesive layer is provided on the surface of the sheet body that is to be attached to the surface of the multi-segment lens; 2. The lens inspection sheet according to claim 1, wherein the sheet body can be detachably attached to the surface of the multi-segment lens by the adhesive layer.

3. 2. The lens inspection sheet according to claim 1, wherein the sheet body is colorless and transparent.

4. 2. The lens inspection sheet according to claim 1, wherein the sheet body has a first portion on which the mark is formed, and a second portion that is separate from the first portion and is to be held by a user.

5. 2. The lens inspection sheet according to claim 1, wherein the central portion is formed by a dot provided at the central position or a plurality of lines intersecting at the central position.

6. 2. The lens inspection sheet according to claim 1, wherein the marks are formed in magenta, red, purple, yellow, or white.

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