Lens inspection sheet

Abstract

To provide a lens inspection sheet for accurately identifying the geometric center of a multi-segment lens. [Solution] A lens inspection sheet 10 used to inspect multi-segment lenses attached to eyeglasses, comprising a sheet body 12 that can be attached to the surface of the multi-segment lens, and a mark 14 formed on the sheet body 12, wherein the mark 14 comprises a plurality of circular portions 16 arranged concentrically and a central portion 18 that indicates the central position of the plurality of circular portions 16.

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 having a sheet body that can be attached to the surface of the multi-segment lens and a mark formed on the sheet body, the mark having a plurality of circular portions arranged concentrically and a central portion that indicates the central position of the plurality of circular portions. [Brief explanation of the drawings]

[0005] [Figure 1] FIG. 1 is a diagram showing eyeglasses with multi-segment lenses. [Figure 2] 10 is a diagram showing the positional relationship between the geometric center of a multi-segment lens and the center of the pupil. FIG. [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 illustrates the lens inspection procedure, showing a multi-segment lens with dot-like marks on the lenslets. [Figure 5B] FIG. 2 is a second diagram showing the procedure for lens inspection, illustrating how the lens inspection sheet is attached to the lens to be inspected. [Figure 5C] FIG. 3 illustrates the lens inspection procedure, showing a multi-segment lens with a mark indicating its geometric center. 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, it 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 annular lenslet arrays 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 causes a light beam that has entered 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, and may be, for example, spherical.

[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 (also called the geometric lens center).

[0012] Each of the multiple lenslet rows 34 is an annular region arranged concentrically around the central clear region 32, and is visible when the multi-segment lens 30 is viewed from a predetermined angle, as shown in Figure 1. Each lenslet row 34 is an array 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, that is, functions as a single-vision lens. Furthermore, because the peripheral clear region 36 is provided so as to surround the lenslet rows 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. If this tolerance is not met, the segmented lens 30 will need to be reworked or the eyeglass frame 38 will need to be adjusted.

[0016] For the above reasons, the multi-segment lens 30 provided in the eyeglasses 40 is inspected by measuring the distance between its geometric center and the center of the pupil 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 for the purpose of accurately identifying the geometric center of the multi-segment lens 30 when inspecting the multi-segment lens 30 (lens inspection).

[0017] The lens inspection sheet 10 is a sheet-like member having a size that can be held by an inspector, and as shown in Fig. 3, has a sheet body 12 and marks 14. The lens inspection sheet 10 may be distributed as a single product separated into individual pieces, or as a product in which multiple pieces are bundled together. In the latter case, multiple lens inspection sheets 10 may be releasably attached to release paper or a backing sheet.

[0018] The sheet body 12 is a sheet formed into a substantially circular shape, and has, for example, the same size as the multi-segment lens 30 before the edging process or a size one size larger or larger. The sheet body 12 can be attached to the first or second surface of the multi-segment lens 30 when it is attached to the eyeglasses 40, that is, when it is fitted into the eyeglass frame 38 (see, for example, FIG. 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] Furthermore, the sheet body 12 may be made of a material that does not transmit light, a material with low light transmittance such as paper, or a material with light transmittance such as a transparent film. However, from the viewpoint of making the mark 14 more clearly visible when the sheet body 12 is attached to the multi-segment lens 30, it is preferable to make the sheet body 12 of a material that does not transmit light or a material with low light transmittance.

[0021] The mark 14 is a pattern and mark formed on the sheet body 12, and as shown in FIG. 3, has a plurality of circular portions 16 arranged concentrically and a central portion 18 indicating the central position of the plurality of circular portions 16.

[0022] The plurality of circular portions 16 are formed to correspond to the plurality of lenslet rows 34 in the multi-segment lens 30. Specifically, the diameter of the circular portion 16 arranged innermost among the plurality of circular portions 16 (hereinafter referred to as the innermost circular portion 16a) is approximately the same as the diameter of the lenslet row 34 arranged innermost among the plurality of lenslet rows 34 (hereinafter referred to as the innermost lenslet row 34a).

[0023] Similarly, the diameter of the nth (n is a natural number greater than or equal to 2) circular portion 16 counting from the inside is substantially the same as the diameter of the nth mark 14 counting from the inside. With this configuration, the distance between two adjacent circular portions 16 among the plurality of circular portions 16 is a length corresponding to the distance between two adjacent lenslet rows 34 among the plurality of lenslet rows 34 (strictly speaking, the two lenslet rows 34 that are in the same order as the two circular portions 16 counting from the inside), specifically, the same length as that distance.

[0024] 3, at least some of the plurality of circular portions 16, specifically, the circular portions 16 other than the two outermost circular portions 16, are each configured with a plurality of circular patterns 20 arranged in a circle. The plurality of circular patterns 20 may be, for example, a pattern having the same outer shape and size as the plurality of lenslets that make up the lenslet array 34. Note that the plurality of patterns that make up each circular portion 16 may be a pattern other than a circle, such as a polygon or a star. Furthermore, each circular portion 16 may be configured with a simple line that describes a circle, in which case the line that describes the circular portion 16 may be a solid line or a dashed line.

[0025] The center portion 18 is located at the common center of the plurality of circular portions 16 and is, for example, a circular dot as shown in FIG. 3. 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 lens center of the central clear region 32). The shape of the center portion 18 is not particularly limited, and it may be a mark other than a circle, such as a polygon, star, or X-shape, or a punched hole may be used as the center portion 18. The size of the center portion 18 is also not particularly limited, as long as it is large enough to clearly indicate the geometric center of the multi-segment lens 30.

[0026] The means for forming the marks 14 on the sheet body 12 is not particularly limited, and the marks 14 may be formed on the sheet body 12 by, for example, printing, laser printing, transferring, embossing, laser marking, etc. From the viewpoint of making the marks 14 more clearly visible when the sheet body 12 is attached to the multi-segment lens 30, it is more preferable to form the marks 14 using a colored pigment or dye.

[0027] [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.

[0028] During lens inspection, first, as shown in FIG. 5A, the examiner visually checks the multiple lenslet rows 34 in the multi-segment lens 30 of the eyeglasses 40, and then places marks (hereinafter referred to as alignment marks T) with a water-based pen or the like at at least two points on the innermost lenslet row 34a.

[0029] Next, the inspector grasps the lens inspection sheet 10 and attaches it to the multi-segment lens 30 along the second surface of the multi-segment lens 30, as shown in Fig. 5B. At this time, the main sheet body 12 is attached to the surface of the multi-segment lens 30 so that two or more alignment marks T made with a water-based pen or the like are positioned on the innermost circular portion 16a of the multiple circular portions 16. In other words, the main sheet body 12 is attached to the surface of the multi-segment lens 30 with the innermost circular portion 16a overlapping the innermost lenslet row 34a of the multiple lenslet rows 34 of the multi-segment lens 30. This causes the center of the innermost circular portion 16a to coincide with the center of the innermost lenslet row 34a. The lens inspection sheet 10 may be attached to the first surface of the multi-segment lens 30 instead of the second surface.

[0030] 5C, the inspector checks the position of center portion 18, which is one of marks 14, on lens inspection sheet 10 attached to multi-segment lens 30, and makes a dot-like mark (hereinafter, center mark C) at that position using a water-based pen or the like from the first surface side of multi-segment lens 30. This center mark C is a mark that indicates the geometric center of multi-segment lens 30.

[0031] Next, the examiner has the wearer wear the eyeglasses 40 equipped with the multi-segment lens 30 marked with the center mark C, and has the wearer look into the distance and straight ahead while maintaining a natural body and head position. In this state, the examiner looks at the center mark C marked on the multi-segment lens 30 and the wearer's pupil as seen through the multi-segment lens 30, and determines whether the positions of the two are aligned. This makes it possible to check whether the positional deviation between the geometric center of the multi-segment lens 30 and the center of the pupil is within an acceptable range.

[0032] According to the above procedure, by using the lens inspection sheet 10, the geometric center of the multi-segment lens 30 can be accurately identified, and as a result, lens inspection can be performed with high precision.

[0033] To explain more specifically, let us assume that marks similar to the marks 14 on the lens inspection sheet 10 (i.e., marks corresponding to the multiple circular portions 16 and the center portion 18) are printed on a paper medium, and that the paper medium is used to perform lens inspection using the same procedure as described above. 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 innermost lenslet row 34a and the mark corresponding to the circular portions 16 (more specifically, the innermost circular portion 16a) printed on the paper medium are superimposed, their centers will be slightly misaligned. Therefore, in lens inspection using the above paper medium, there is a risk that the geometric center of the multi-segment lens 30 will be identified at a position slightly offset from its original position.

[0034] In contrast, by using the lens inspection sheet 10, the sheet body 12 can be attached along the surface of the multi-segment lens 30, and by overlapping the innermost lenslet row 34a with the innermost circular portion 16a, the centers of the two can be accurately aligned. This makes it possible to accurately identify the geometric center of the multi-segment lens 30, and as a result, lens inspection can be performed with high precision. Furthermore, in the case of the multi-segmented lens 30 to which the sheet body 12 is attached, the layout of the multiple lenslet rows 34 provided in the multi-segmented lens 30 (i.e., the lenslet arrangement pattern) can be roughly confirmed by looking at the multiple circular portions 16 formed in a concentric arrangement on the sheet body 12. Furthermore, since the sheet body 12 can be attached to and detached from the multi-segment lens 30, one lens inspection sheet 10 can be used for multiple lens inspections. [Explanation of symbols]

[0035] 10 Lens inspection sheet 12 Seat body 14 marks 16 Circle 16a Innermost circle 18 Center 20 circular patterns 22 Adhesive layer 30 Multi-segment Lens 32 Central clear area 34 Lenslet Array 34a Innermost lenslet row 36 Peripheral clear area 38 eyeglass frames 40 glasses C center mark T alignment mark

Claims

1. A lens inspection sheet used to inspect multi-segment lenses provided in spectacles, a sheet body that can be attached to the surface of the multi-segment lens; a mark formed on the sheet body, The mark on the lens inspection sheet includes a plurality of circular portions arranged concentrically and a center portion indicating the center position of the plurality of circular portions.

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 attached to the surface of the multi-segment lens in a state in which the innermost circular portion of the plurality of circular portions overlaps the innermost lenslet row of the plurality of lenslet rows that are visible in the multi-segment lens and arranged concentrically.

4. 4. The lens inspection sheet according to claim 3, wherein the distance between two adjacent circular portions among the plurality of circular portions is a length corresponding to the distance between two adjacent lenslet rows among the plurality of lenslet rows.

5. 2. The lens inspection sheet according to claim 1, wherein at least some of the plurality of circular portions are configured by a plurality of circular patterns arranged in a circle.

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