Polarizing lens for spectacles, and sunglasses including the same

Abstract

To provide a polarizing lens for spectacles that allows easy recognition of a difference in the grain of the glass in golf.SOLUTION: A polarizing lens for spectacles (1) processed in accordance with the shape of a spectacle frame (3) comprises: a first lens base material (11) that forms an object-side surface; a second lens base material (12) that forms an eye ball-side surface; and a polarized film (13) that is arranged between the first lens base material and the second lens base material. When the polarizing lens is put into the spectacle frame, it is arranged such that an absorption axis (P) of the polarized film is directed to the vertical direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a polarizing lens for glasses and sunglasses equipped with the same, and particularly to a polarizing lens for glasses that is arranged such that the polarization axis of the polarizing film faces the vertical direction when it is framed in a glasses frame, and sunglasses equipped with the same.

Background Art

[0002] Conventionally, a polarizing lens for glasses that aligns the incident direction of light by means of a polarization function has been put into practical use. Since such a polarizing lens for glasses can suppress glare and reflection and prevent twinkling, and can provide a comfortable visual field, it is used in various applications such as driving a car, operating an aircraft, fishing, and golf.

[0003] A polarizing lens for glasses generally has a polarizing film inside a lens substrate, and shields / transmits polarized light by the absorption axis (polarization axis) of the polarizing film. However, reflected light from a road or a water surface contains a lot of polarized light parallel to the interface (that is, horizontally polarized light), which causes glare and reflection. Therefore, the absorption axis of the polarizing film is arranged to be in the horizontal direction of the glasses and framed in a glasses frame (for example, Patent Document 1).

[0004] For example, Patent Document 1 describes a polarizing lens created by bending a polarizing laminate made by laminating a cast molding sheet, a linear polarizer, and a thermal bonding sheet in this order and attaching the layers using an adhesive or an adhesive, and sunglasses in which the polarizing lens is framed with the stretching direction of the polarizer aligned with the horizontal direction of the glasses.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The polarizing lens described in Patent Document 1 is framed so that the stretching direction of the polarizer (i.e., the absorption axis) is in the horizontal direction of the glasses. Therefore, it can preferably absorb reflected light from roads or water surfaces (i.e., horizontally polarized light), and when used for applications such as driving a car, operating an aircraft, or fishing, it is possible to obtain a comfortable field of view. However, for example, when looking at the grass in golf, in certain applications, it was not always possible to obtain a comfortable (desired) field of view.

[0007] The present invention has been made in view of such circumstances, and an object thereof is to provide a polarizing lens for glasses that can easily recognize differences in grass in golf and the like, and to provide sunglasses equipped with such a polarizing lens for glasses.

Means for Solving the Problems

[0008] Then, as a result of intensive studies by the present inventors to achieve the above object, in certain applications, it was found that reflected light from an object incident on the eye may contain a large amount of vertically polarized light, and arranging the stretching direction of the polarizer (i.e., the absorption axis) to be in the vertical direction of the glasses can obtain a more comfortable (desired) field of view than when arranged to be in the horizontal direction. The present invention has been made based on such findings.

[0009] That is, the polarizing lens for glasses of the present invention is a polarizing lens for glasses processed according to the shape of the glasses frame, and includes a first lens substrate forming the side surface of the object, a second lens substrate forming the side surface of the eyeball, and a polarizing film disposed between the first lens substrate and the second lens substrate. When framed in the glasses frame, the absorption axis of the polarizing film is arranged to face the vertical direction.

[0010] According to such a configuration, when looking at the turf in golf or the like, when the reflected light from the object incident on the eye contains a lot of vertically polarized light, a comfortable (desired) visual field can be obtained.

[0011] Further, at least one of the first lens substrate and the second lens substrate is a translucent plastic substrate containing a resin and an absorption dye, and in the spectral transmittance curve, it preferably has a minimum value between 550 and 600 nm. Also, in this case, the minimum value is preferably 12 to 34%.

[0012] Further, the resin is preferably at least one selected from the group consisting of urethane-based thermosetting resins, (meth)acrylic-based thermosetting resins, polycarbonate resins, and polyamide resins.

[0013] Further, the absorption dye preferably contains a tetraazaporphyrin-based dye whose maximum absorption wavelength is in the range of 565 to 605 nm. Also, in this case, the concentration of the tetraazaporphyrin-based dye is preferably 1.0 to 7.0 ppm.

[0014] Also, the visual transmittance is preferably 24 to 30%.

[0015] Further, a functional film is provided on at least one of the object side surface and the eyeball side surface, and the functional film is preferably one or more thin film layers selected from the group consisting of a primer layer, a hard coat layer, an antireflection layer, and a water / oil repellent layer.

[0016] Further, from another viewpoint, the sunglasses of the present invention are characterized by including any one of the above-mentioned polarizing lenses for glasses.

Advantages of the Invention

[0017] As described above, according to the present invention, a polarizing lens for glasses capable of easily recognizing differences in turf in golf or the like is realized. Also, sunglasses equipped with such a polarizing lens for glasses are realized.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their descriptions will not be repeated.

[0020] Figure 1 is a diagram for explaining the configuration of a polarizing lens 10 (polarizing lens for glasses) according to an embodiment of the present invention. Figure 1(a) is a diagram showing sunglasses 1 in which a pair of polarizing lenses 10 are framed, and Figure 1(b) is a cross-sectional view taken along line A-A of the polarizing lens 10 in Figure 1(a). The polarizing lens 10 of the present embodiment is a lens for glasses that aligns the incident direction of light by a polarizing function, and can obtain a comfortable (desired) visual field particularly when viewing a lawn in golf or the like, when the reflected light from an object incident on the eye contains a large amount of vertically polarized light.

[0021] [Configuration of Polarizing Lens] As shown in FIG. 1(b), the polarizing lens 10 of the present embodiment includes a first lens substrate 11 that forms the side surface of the object (the surface located on the object side), a second lens substrate 12 that forms the side surface of the eyeball (the surface located on the eyeball side), and a polarizing film 13 disposed between the first lens substrate 11 and the second lens substrate 12. As shown in FIG. 1(a), when the polarizing lens 10 is framed in the frame 3 (eyeglass frame) of the sunglasses 1, the absorption axis P of the polarizing film 13 is arranged to face the vertical direction. In the present embodiment, a functional film 14 is formed on the object side surface of the first lens substrate 11, and a functional film 15 is formed on the eyeball side surface of the second lens substrate 12 (FIG. 1(b)).

[0022] [Lens Substrate] The first lens substrate 11 and the second lens substrate 12 of the present embodiment are light-transmissive plastic substrates made of a transparent resin material, and are obtained by molding a predetermined resin material into a predetermined shape (for example, the shape of an eyeglass lens). As the resin material, for example, it is preferably at least one selected from the group consisting of urethane-based thermosetting resins, (meth)acrylic-based thermosetting resins, polycarbonate resins, polyamide resins, ADC (allyl diglycol carbonate) resins, and ultraviolet curable resins. Further, the first lens substrate 11 and the second lens substrate 12 may be dyed in a predetermined color. For example, they may contain an absorption dye that absorbs light of a specific wavelength so as to have anti-glare properties. As the dyeing method for the first lens substrate 11 and the second lens substrate 12, conventionally known dip methods, transfer dyeing methods, etc. can be used. Moreover, as the absorption dye that exhibits an anti-glare function, for example, a dye (for example, a tetraazaporphyrin-based dye) having an absorption peak (maximum absorption wavelength) in the range of 565 to 605 nm and a half-value width of the peak of 20 to 40 nm is known (for example, refer to Japanese Patent No. 5778109). The concentration of the absorption dye is preferably 1.0 to 7.0 ppm, more preferably 2.0 to 6.0 ppm, with respect to the resin (monomer) of the resin material.

[0023] [Polarizing Film] The polarizing film 13 of this embodiment is a uniform resin sheet with a thickness of 0.1 mm or less. For example, it is a polarizing film obtained by adsorbing or impregnating iodine or a dichroic dye on a uniaxially stretched polyvinyl alcohol (PVA) film. As the polarizing film 13, for example, light smoke 70 (thickness: 30 - 40 μm, parallel transmittance: 17.49%, orthogonal transmittance: 1.23%, degree of polarization: 93.2%) can be used. [Functional film] The functional films 14 and 15 of this embodiment are, for example, one or more thin film layers selected from the group consisting of a primer layer, a hard coat layer, an antireflection layer, and a water / oil repellent layer. In this embodiment, the functional film 14 is formed on the object side surface of the first lens substrate 11, and the functional film 15 is formed on the eyeball side surface of the second lens substrate 12. However, the functional films 14 and 15 are not necessarily required and may be formed on at least one of the object side surface of the first lens substrate 11 and the eyeball side surface of the second lens substrate 12. Note that the functional films 14 and 15 are formed by a conventionally known spin coating method, dip method, vapor deposition method, or the like. [Configuration of sunglasses] As shown in Fig. 1(a), the sunglasses 1 of this embodiment are configured by framing a pair of polarizing lenses 10 in a frame 3. When the polarizing lenses 10 are framed in the frame 3 of the sunglasses 1, the absorption axis P of the polarizing film 13 is arranged to face the vertical direction.

[0024] Thus, since the polarizing lenses 10 of this embodiment are arranged such that the absorption axis P of the polarizing film 13 faces the vertical direction when the polarizing lenses 10 are framed in the frame 3 of the sunglasses 1, it is possible to obtain a comfortable (desired) visual field particularly when looking at the grass in golf and other situations where the reflected light from an object incident on the eye contains a large amount of vertically polarized light. Further, when the first lens substrate 11 or the second lens substrate 12 of the polarizing lens 10 contains an absorbing dye (for example, a tetraazaporphyrin-based dye), the polarizing lens 10 has an antiglare function. Also, when the polarizing lens 10 has the functional films 14 and 15, the polarizing lens 10 has functions corresponding to the functional films 14 and 15.

[0025] [Manufacturing Method of Polarizing Lens] The polarizing lens 10 of the present embodiment is manufactured, for example, by the following injection molding process. (1) Prepare a predetermined polarizing film 13 and place it in the mold of the polarizing lens 10. (2) Inject the resin constituting the first lens substrate 11 and the second lens substrate 12 into the mold, and cool and solidify it. (3) Form the functional films 14 and 15 on the molded lens obtained in (2) by spin coating.

[0026] [Manufacturing Method of Sunglasses] The sunglasses 1 of the present embodiment are obtained by molding the polarizing lens 10 so that the absorption axis P of the polarizing film 13 faces the vertical direction and fits into the frame 3, and then fitting the molded polarizing lens 10 into the frame 3.

[0027] Hereinafter, the polarizing lens 10 of the present embodiment will be further described with reference to Examples 1 to 3 and Comparative Example 1. Note that the present invention is not limited to the following examples.

[0028] Table 1 shows the materials (lens substrates, absorption dyes, polarizing films, functional films), the directions of the absorption axes P, the visual transmittance (%), the parallel transmittance (%), the orthogonal transmittance (%), the degree of polarization (%), and the minimum value (%) and its wavelength in the spectral transmittance curve in the range of 550 to 600 nm of each polarizing lens 10 of Examples 1 to 3 and the polarizing lens of Comparative Example 1. Also, FIG. 2 is a diagram showing the spectral transmittance curves of each polarizing lens 10 of Examples 1 to 3 and the polarizing lens of Comparative Example 1. In FIG. 2, the horizontal axis represents the wavelength (nm), and the vertical axis represents the spectral transmittance (%). In the measurement of the spectral transmittance, a spectrophotometer U-4100 manufactured by Hitachi, Ltd. was used. In the measurement of the visual transmittance, parallel transmittance, orthogonal transmittance, and degree of polarization, an integrating sphere type spectral transmittance meter DOT-3 manufactured by Murakami Color Technology Research Institute Co., Ltd. was used.

[0029]

Table 1

[0030] (Example 1) In the polarizing lens 10 of Example 1, a urethane resin (MR-8) manufactured by Mitsui Chemicals, Inc. was selected as the first lens substrate 11 and the second lens substrate 12, and Light Smoke 70 (parallel transmittance: 17.49%, orthogonal transmittance: 1.23%, degree of polarization: 93.2%) was selected as the polarizing film 13. Then, according to the above manufacturing method, a sample (direct line 70 mm, thickness 2 mm) of the polarizing lens 10 of Example 1 was created. Further, as the functional film 14, a hard coat was vapor-deposited, and as the functional film 15, an antireflection coat was vapor-deposited. As a result (Table 1), a sample of the polarizing lens 10 with a visual transmittance of 30.16%, parallel transmittance of 17.49%, orthogonal transmittance of 1.23%, and degree of polarization of 93.2% was obtained. Then, the sample of this polarizing lens 10 was molded so that the absorption axis P of the polarizing film 13 faced the vertical direction and fit into the frame 3, and the molded polarizing lens 10 was framed in the frame 3 to create the sunglasses 1. In this way, the polarizing lens 10 of Example 1 is arranged so that the absorption axis P of the polarizing film 13 faces the vertical direction. Note that in the polarizing lens 10 of Example 1, since the first lens substrate 11 and the second lens substrate 12 do not contain an absorption dye, no absorption peak occurs at 550 to 600 nm in the spectral transmittance curve (Figure 2, Table 1).

[0031] (Example 2) In the polarizing lens 10 of Example 2, urethane resin (MR-8) manufactured by Mitsui Chemicals, Inc. was selected as the first lens substrate 11 and the second lens substrate 12, and tetraazaporphyrin-based dye (PD-311S: 200 ppm) manufactured by Yamamoto Chemical Co., Ltd. was selected as the absorption dye, and light smoke 70 (parallel transmittance: 17.49%, orthogonal transmittance: 1.23%, degree of polarization: 93.2%) was selected as the polarizing film 13. Then, according to the above manufacturing method, a sample (direct line 70 mm, thickness 2 mm) of the polarizing lens 10 of Example 2 was created, and further, a hard coat was vapor-deposited as the functional film 14, and an antireflection coat was vapor-deposited as the functional film 15. As a result (Table 1), a sample of the polarizing lens 10 with a visual transmittance of 27.01%, a parallel transmittance of 14.24%, an orthogonal transmittance of 1.23%, and a degree of polarization of 93.4% was obtained. Then, the sample of this polarizing lens 10 was molded so that the absorption axis P of the polarizing film 13 faced the vertical direction and fit into the frame 3, and the molded polarizing lens 10 was framed in the frame 3 to create the sunglasses 1. In this way, the polarizing lens 10 of Example 2 is arranged so that the absorption axis P of the polarizing film 13 faces the vertical direction. In the polarizing lens 10 of Example 2, since the absorption dye (PD-311S: 200 ppm) is contained in the first lens substrate 11 and the second lens substrate 12, an absorption peak occurs at 550 to 600 nm in the spectral transmittance curve, and its minimum value is 22.19% (@586 nm) (Figure 2, Table 1). In this way, since the transmittance near the wavelength of 586 nm is suppressed to be low (for example, 35% or less), antiglare property is imparted and the contrast is enhanced.

[0032] (Example 3) In the polarizing lens 10 of Example 3, urethane resin (MR-8) manufactured by Mitsui Chemicals, Inc. was selected as the first lens substrate 11 and the second lens substrate 12, and tetraazaporphyrin-based dye (PD-311S: 500 ppm) manufactured by Yamamoto Chemical Co., Ltd. was selected as the absorption dye, and light smoke 70 (parallel transmittance: 17.49%, orthogonal transmittance: 1.23%, degree of polarization: 93.2%) was selected as the polarizing film 13. Then, according to the above manufacturing method, a sample of the polarizing lens 10 of Example 3 (direct line 70 mm, thickness 2 mm) was prepared. Further, as the functional film 14, a hard coat was vapor-deposited, and as the functional film 15, an antireflection coat was vapor-deposited. As a result (Table 1), a sample of the polarizing lens 10 with a visual transmittance of 24.34%, a parallel transmittance of 11.64%, a perpendicular transmittance of 0.73%, and a polarization degree of 93.9% was obtained. Then, this sample of the polarizing lens 10 was molded so that the absorption axis P of the polarizing film 13 faced the vertical direction and was fitted into the frame 3, and the molded polarizing lens 10 was framed in the frame 3 to produce the sunglasses 1. In this way, the polarizing lens 10 of Example 3 is arranged so that the absorption axis P of the polarizing film 13 faces the vertical direction. In addition, in the polarizing lens 10 of Example 3, since the first lens substrate 11 and the second lens substrate 12 contain an absorption dye (PD-311S: 500 ppm), an absorption peak occurs at 550 - 600 nm in the spectral transmittance curve, and its minimum value is 11.74% (@586 nm) (Figure 2, Table 1). In this way, since the transmittance near the wavelength of 586 nm is suppressed to be low (for example, 35% or less), antiglare property is imparted and the contrast is enhanced.

[0033] (Comparative Example 1) In the polarizing lens of Comparative Example 1, a urethane resin (MR-8) manufactured by Mitsui Chemicals, Inc. was selected as the first lens substrate 11 and the second lens substrate 12, and Light Smoke 70 (parallel transmittance: 17.49%, perpendicular transmittance: 1.23%, polarization degree: 93.2%) was selected as the polarizing film 13. Then, according to the above manufacturing method, a sample of the polarizing lens of Comparative Example 1 (direct line 70 mm, thickness 2 mm) was prepared. Further, as the functional film 14, a hard coat was vapor-deposited, and as the functional film 15, an antireflection coat was vapor-deposited. As a result (Table 1), a sample of the polarizing lens with a visual transmittance of 31.58%, a parallel transmittance of 18.21%, a perpendicular transmittance of 1.29%, and a polarization degree of 93.2% was obtained. Then, a sample of this polarizing lens was molded so that the absorption axis P of the polarizing film 13 faced the horizontal direction and fit within the frame 3, and the molded polarizing lens was framed in the frame 3 to create the sunglasses 1. Thus, in the polarizing lens of Comparative Example 1, the absorption axis P of the polarizing film 13 is arranged to face the horizontal direction. Note that in the polarizing lens of Comparative Example 1, since the first lens substrate 11 and the second lens substrate 12 do not contain an absorption dye, in the spectral transmittance curve, an absorption peak does not occur at 550 to 600 nm (FIG. 2, Table 1).

[0034] [Effect Confirmation Experiment] FIGS. 3 to 6 are diagrams showing the effect confirmation experiment and the results of evaluating each of the polarizing lenses 10 of Examples 1 to 3 and the polarizing lens of Comparative Example 1 conducted by the present inventors. FIG. 3 is a diagram explaining the experimental model (experimental environment) of the effect confirmation experiment. FIG. 4 shows the results of a quantitative evaluation of "recognition of grass patterns" by the VAS (Visual Analogue Scale) evaluation method. FIG. 5 shows the results of a quantitative evaluation of "awareness of photophobia" by the VAS evaluation method. FIG. 6 shows the results of a quantitative evaluation of "natural appearance" by the VAS evaluation method. Note that this effect confirmation experiment was conducted on 12 subjects S, and the vertical axis of each graph in FIGS. 4 to 6 shows the average value of the subjective evaluation values (VAS values) of the 12 subjects S.

[0035] As shown in FIG. 3(a), in the effect confirmation experiment, a test chart C (FIG. 3(b)) was placed on a desk, and an illumination device B (artificial sun lighting lamp (manufactured by Seric Co., Ltd.: XC-500)) was placed at a position 50 cm above the test chart C. The test chart C was illuminated by illumination light L1 incident at an angle of approximately 45° obliquely from the illumination device B. The subject S observed the test chart C (that is, the reflected light L2 from the test chart C) at a position approximately 2 m away from the test chart C using the sunglasses 1 in which any one of the polarizing lenses 10 of Examples 1 to 3 and the polarizing lens of Comparative Example 1 was framed.

[0036] As shown in FIG. 3(b), the test chart C is an A3-sized plate-shaped chart on which two types of artificial turf G1 and G2 imitating the green of a golf course are arranged. The artificial turf G1 has turf patterns formed from bottom (front) to top (back side) (so-called, in the normal direction), and the artificial turf G2 has turf patterns formed from top to bottom (so-called, in the reverse direction). Note that the illuminance on the test chart C was adjusted to be about 20,000 lux.

[0037] [Evaluation of "Recognition of Turf Patterns"] As the "Recognition of Turf Patterns" evaluation, each subject S observed the test chart C in order using each of the polarizing lenses 10 of Examples 1 to 3 and the sunglasses 1 in which the polarizing lens of Comparative Example 1 was framed, and evaluated on a 10-point scale the degree to which the boundary between the artificial turfs G1 and G2 could be recognized, recording it as a subjective evaluation value (VAS value). FIG. 4 shows the average values of the VAS values of the "Recognition of Turf Patterns" evaluation obtained by 12 subjects S for each of the polarizing lenses 10 of Examples 1 to 3 and the polarizing lens of Comparative Example 1. As shown in FIG. 4, the VAS values of the "Recognition of Turf Patterns" evaluation were 5.24 for Comparative Example 1, 8.43 for Example 1, 6.48 for Example 2, and 6.58 for Example 3. Thus, since the VAS values of Examples 1 to 3 were larger than the VAS value of Comparative Example 1, when looking at turf patterns in golf, the reflected light L2 from the object incident on the eye (that is, the test chart C) contains a lot of vertically polarized light, and it was found that it is easier to "recognize turf patterns" when the absorption axis P of the polarizing film 13 is arranged in the vertical direction than when it is arranged in the horizontal direction.

[0038] [Evaluation of "Sensation of Photophobia"] As the "Sensation of Photophobia" evaluation, each subject S observed the test chart C in order using each of the polarizing lenses 10 of Examples 1 to 3 and the sunglasses 1 in which the polarizing lens of Comparative Example 1 was framed, and evaluated on a 10-point scale the degree of glare of the artificial turfs G1 and G2, recording it as a subjective evaluation value (VAS value). Figure 5 shows the average VAS values of the "sensation of glare" evaluations obtained by 12 subjects S for each of the polarizing lenses 10 of Examples 1 to 3 and the polarizing lens of Comparative Example 1. As shown in Figure 5, the respective VAS values of the "sensation of glare" evaluations were 6.92 for Comparative Example 1, 7.13 for Example 1, 7.42 for Example 2, and 6.92 for Example 3. Thus, the VAS value of Example 1 became larger than the VAS value of Comparative Example 1. This is presumably due to arranging the absorption axis P of the polarizing film 13 to be in the vertical direction. Also, the VAS value of Example 2 became larger than the VAS value of Example 1. This is presumably due to the anti-glare effect of the absorption dyes contained in the first lens substrate 11 and the second lens substrate 12. Also, the VAS value of Example 3 became smaller than the VAS value of Example 2 and became equivalent to the VAS value of Comparative Example 1. From this, it is considered that if the amount of absorption dyes contained in the first lens substrate 11 and the second lens substrate 12 is increased too much (that is, if the minimum value at 550 to 600 nm becomes too small), the anti-glare effect by the absorption dyes will decrease. Therefore, it was found that in order to obtain the anti-glare effect by the absorption dyes, the content of the absorption dyes in Example 3 (500 ppm) is preferably adjusted to be approximately the maximum so that the minimum value at 550 to 600 nm is 12% or more. In addition, in the spectral transmittance curve of Example 1, since the spectral transmittance at 586 nm was 34.16% (Figure 2), it is preferable that the content of the absorption dyes is adjusted within the range where the minimum value at 550 to 600 nm is 12 to 34%.

[0039] [Evaluation of "Natural Appearance"] As the "evaluation of natural appearance", each subject S used the sunglasses 1 with the polarizing lenses 10 of Examples 1 to 3 and the polarizing lens of Comparative Example 1 framed in order to observe the test chart C, and evaluated the natural appearance of the artificial turf G1 and G2 on a 10-point scale and recorded it as the subjective evaluation value (VAS value). Figure 6 shows the average VAS values of the "evaluation of natural appearance" obtained by 12 subjects S for each of the polarizing lenses 10 of Examples 1 to 3 and the polarizing lens of Comparative Example 1. As shown in Fig. 6, the VAS values of the "natural appearance" evaluation were 5.73 in Comparative Example 1, 6.44 in Example 1, 3.85 in Example 2, and 3.76 in Example 3. Thus, the VAS value of Example 1 was larger than that of Comparative Example 1, while the VAS values of Examples 2 and 3 were smaller than that of Comparative Example 1. This is presumably mainly due to the influence of the absorbing dyes contained in the first lens substrate 11 and the second lens substrate 12. However, since it is an evaluation of the color tone through the sunglasses 1, all were evaluated to be at a practical level.

[0040] Thus, the polarizing lens 10 of the present embodiment (Examples 1 to 3) has the same antiglare effect as the conventional one (i.e., the one with the absorption axis P of the polarizing film 13 in the horizontal direction) while improving the "checkerboard recognition" by arranging the absorption axis P of the polarizing film 13 in the vertical direction. Therefore, if the polarizing lens 10 is applied to applications such as the sunglasses 1 for golf, which contain a large amount of vertically polarized light in the reflected light from an object incident on the eye, a comfortable (desired) visual field can be obtained.

[0041] The above is the description of the embodiment of the present invention. However, the present invention is not limited to the configuration of the above embodiment, and various modifications are possible within the scope of its technical idea.

[0042] For example, the polarizing lens 10 of the present embodiment (Examples 1 to 3) was manufactured by integrally molding a resin (i.e., the first lens substrate 11 and the second lens substrate 12) by an injection molding process, but it is not limited to such a manufacturing method. Also, in the present embodiment (Examples 1 to 3), the polarizing lens 10 has been described as having a five-layer structure composed of the first lens substrate 11, the second lens substrate 12, the polarizing film 13, and the functional films 14 and 15, but it is not necessarily limited to such a configuration. For example, the polarizing lenses 10 of Examples 2 and 3 contain absorption dyes in the first lens substrate 11 and the second lens substrate 12. However, instead of such a configuration, a resin layer containing an absorption dye may be separately formed on at least one surface of the first lens substrate 11 and the second lens substrate 12 to form a five-layer or six-layer structure. In this case, the resin layer is formed on the surfaces of the first lens substrate 11 and the second lens substrate 12 by, for example, the spin coating method.

[0043] In addition, in this embodiment (Examples 1 to 3), the polarizing lens 10 has been described as being usable for the sunglasses 1. However, it is not necessarily limited to such applications and can be applied to various applications such as ordinary glasses and goggles (for swimming, skiing, riding, etc., for all sports).

[0044] It should be noted that the embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the scope of claims, and it is intended that all modifications within the meaning and scope equivalent to the scope of claims are included.

Explanation of Reference Numerals

[0045] 1: Sunglasses 3: Frame 10: Polarizing lens 11: First lens substrate 12: Second lens substrate 13: Polarizing film 14: Functional film 15: Functional film 22: Absorption dye B: Lighting device C: Test chart G1: Artificial turf G2: Artificial turf L1: Illumination light L2: Reflected light P: Absorption axis S: Subject

Claims

1. A polarizing lens for glasses, which is processed according to the shape of the glasses frame, a first lens substrate forming the side of the object, a second lens substrate forming the side of the eyeball, a polarizing film disposed between the first lens substrate and the second lens substrate, and comprising when framed in the glasses frame, it is arranged such that the absorption axis of the polarizing film faces the vertical direction A polarizing lens for glasses, characterized in that.

2. At least one of the first lens substrate and the second lens substrate is a translucent plastic substrate containing a resin and an absorption dye, In the spectral transmittance curve, it has a minimum value between 550 and 600 nm, The polarizing lens for glasses according to claim 1, characterized in that.

3. The polarizing lens for glasses according to claim 2, characterized in that the minimum value is 12 - 34%.

4. The resin is at least one selected from the group consisting of urethane-based thermosetting resins, (meth)acrylic-based thermosetting resins, polycarbonate resins, and polyamide resins. The polarizing lens for glasses according to claim 2, characterized in that.

5. The absorption dye contains a tetraazaporphyrin-based dye whose maximum absorption wavelength is in the range of 565 - 605 nm. The polarizing lens for glasses according to claim 2, characterized in that.

6. The polarizing lens for glasses according to claim 5, characterized in that the concentration of the tetraazaporphyrin-based dye is 1.0 - 7.0 ppm.

7. The polarizing lens for glasses according to claim 1, characterized in that the visual transmittance is 24 - 30%.

8. It has a functional film on at least one of the side of the object and the side of the eyeball, The functional film is one or more thin film layers selected from the group consisting of a primer layer, a hard coat layer, an antireflection layer, and a water / oil repellent layer. The polarizing lens for glasses according to claim 1, characterized in that.

9. Sunglasses comprising the polarizing lens for glasses according to any one of claims 1 to 8.

Images