Optical Components

Abstract

To provide a technology that suppresses a change of hue of an optical member that is caused by a change of angle of a visual line to the optical member.SOLUTION: An optical member comprises a transparent substrate that passes a visible ray therethrough, and an optical multilayer film that is provided on at least one of the principal planes of the transparent substrate. The optical multilayer film provided on one of the principal planes of the transparent substrate has the characteristics: (A) a maximum reflectance R(5°)450-650max to light at an incidence angle 5° and 450 nm to 650 nm in wavelength is 2.00% or less; (B) a maximum reflectance R(30°)450-650max to light at an incidence angle 30° and 450 nm to 650 nm in wavelength is 2.00% or less; (C) the wavelength λ(5°) of light at an incidence angle 5° that indicates a reflectance 30% is 365 nm to 425 nm, and the wavelength λ(30°) of light at an incidence angle 30° that indicates a reflectance 30% is 365 nm to 425 nm.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to optical members. [Background technology]

[0002] In recent years, wearable devices such as AR (Augmented Reality) devices and MR (Mixed Reality) devices have been developed (Patent Document 1). The wearable device includes an optical member. The optical member includes a transparent substrate that transmits visible light and an optical multilayer film provided on at least one main surface of the transparent substrate.

[0003] The optical multilayer film is not particularly limited, but may be, for example, an anti-reflection film. An anti-reflection film is formed by alternately laminating a first layer made of a dielectric material with a high refractive index (e.g., TiO2) and a second layer made of a dielectric material with a low refractive index (e.g., SiO2), and utilizes the interference effect of light to suppress reflection of visible light. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2020-533721 Summary of the Invention [Problem to be solved by the invention]

[0005] It is known that the optical properties of optical multilayer coatings are highly dependent on the angle of incidence. As the angle of incidence changes, the optical path length changes, and the optical properties also change. For example, as the angle of incidence changes, the reflectance of a specific wavelength changes. As a result, the color of the optical component can change depending on the angle of the line of sight relative to the optical component.

[0006] For example, if a wearable device has optical elements for the right and left eyes, and the viewer is standing to the right or left of the center of the wearable device in the horizontal direction, the angle of the viewer's line of sight with respect to the optical elements for the right and left eyes will be different, which may cause the optical elements for the right and left eyes to appear in different colors.

[0007] One aspect of the present disclosure provides a technique for suppressing changes in the color tone of an optical element due to changes in the angle of the line of sight relative to the optical element. [Means for solving the problem]

[0008] An optical member according to one aspect of the present disclosure includes a transparent substrate that transmits visible light and an optical multilayer film provided on at least one main surface of the transparent substrate, wherein the optical multilayer film provided on the one main surface of the transparent substrate has (A) a maximum reflectance R(5°) for light having a wavelength of 450 nm to 650 nm at an incident angle of 5°. 450~650max (B) the maximum reflectance R(30°) for light having a wavelength of 450 nm to 650 nm at an incident angle of 30° is 2.00% or less; 450~650max (C) the wavelength λ(5°) of light at an incident angle of 5° that exhibits a reflectance of 30% is 365 nm to 425 nm, and (D) the wavelength λ(30°) of light at an incident angle of 30° that exhibits a reflectance of 30% is 365 nm to 425 nm. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, it is possible to suppress changes in the color tone of an optical member caused by changes in the angle of the line of sight relative to the optical member. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view of an optical member according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing an example of an optical multilayer film. [Figure 3] FIG. 3 is a diagram showing the reflectance of the optical multilayer film of Example 1. [Figure 4]FIG. 4 is a diagram showing the reflectance of the optical multilayer film of Example 2. [Figure 5] FIG. 5 is a diagram showing the reflectance of the optical multilayer film of Example 3. [Figure 6] FIG. 6 is a diagram showing the reflectance of the optical multilayer film of Example 4. [Figure 7] FIG. 7 is a diagram showing the reflectance of the optical multilayer film of Example 5. [Figure 8] FIG. 8 is a diagram showing the reflectance of the optical multilayer film of Example 6. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or corresponding components are denoted by the same reference numerals, and their description may be omitted. In the specification, the symbol "to" indicating a range of values ​​means that the values ​​before and after it are included as the lower and upper limits.

[0012] First, an optical member 1 according to one embodiment will be described with reference to Fig. 1. The use of the optical member 1 is not particularly limited, but for example, it is a wearable device. The wearable device may be an AR (Augmented Reality) device or an MR (Mixed Reality) device.

[0013] The optical member 1 may be used in an image display device such as a display or electronic paper. The display may be, for example, an LCD (Liquid Crystal Display), an LCOS (Liquid Crystal On Silicon), an OLED (Organic Light Emitting Diode), or a MEMS (Micro Electro Mechanical System).

[0014] The optical member 1 includes a transparent substrate 2 that transmits visible light. The transparent substrate 2 has a first main surface 21 and a second main surface 22 facing opposite to the first main surface 21. The thickness of the transparent substrate 2 is preferably 0.1 mm or more and 5.0 mm or less, and more preferably 0.1 mm to 1.0 mm, from the viewpoints of (A) reducing warping that occurs when depositing the first optical multilayer film 3A and the second optical multilayer film 3B, etc., (B) achieving a thinner substrate, and (C) preventing cracking.

[0015] The material of the transparent substrate 2 is not particularly limited, and may be either an organic material or an inorganic material as long as it transmits visible light. The transparent substrate 2 may be a composite of multiple different materials. The transparent substrate 2 may have a single-layer structure or a multi-layer structure. As the inorganic material of the transparent substrate 2, glass or a crystalline material is preferably used.

[0016] The glass is soda-lime glass, borosilicate glass, alkali-free glass, quartz glass, or aluminosilicate glass. The glass may be chemically strengthened glass. Chemically strengthened glass is glass in which a compressive stress layer is formed on the surface by ion exchange at a temperature below the glass transition point. The compressive stress layer is formed by exchanging alkali metal ions with a small ionic radius contained in the glass for alkali ions with a larger ionic radius.

[0017] The crystalline material may be a birefringent crystal, for example silicon dioxide, lithium niobate, or sapphire.

[0018] The optical member 1 includes, for example, a first optical multilayer film 3A and a second optical multilayer film 3B. The first optical multilayer film 3A is formed on a first main surface 21 of a transparent substrate 2. The second optical multilayer film 3B is formed on a second main surface 22 of the transparent substrate 2. It is sufficient that the optical member 1 includes at least one of the first optical multilayer film 3A and the second optical multilayer film 3B.

[0019] Next, the configuration of the first optical multilayer coating 3A will be described with reference to Fig. 2. The configuration of the second optical multilayer coating 3B is similar to that of the first optical multilayer coating 3A, and therefore description thereof will be omitted. The first optical multilayer coating 3A is, for example, an anti-reflection coating formed by alternately laminating first layers 31 and second layers 32 having different refractive indices, and utilizes the interference effect of light to suppress reflection of visible light.

[0020] The second layer 32 has a higher refractive index than the first layer 31. In other words, the first layer 31 is a low refractive index layer, and the second layer 32 is a high refractive index layer. In this specification, when the term "refractive index" is simply used, it refers to the refractive index of light with a wavelength of 500 nm.

[0021] The refractive index of the first layer 31 is preferably less than 1.60, and more preferably 1.45 to 1.55. The material of the first layer 31 is, for example, silicon oxide (for example, silicon dioxide: SiO2), magnesium fluoride (for example, MgF2), or silicon oxynitride.

[0022] The refractive index of the second layer 32 is preferably 1.60 or more, and more preferably 2.20 to 2.50. The material of the second layer 32 is, for example, tantalum oxide (for example, tantalum pentoxide: Ta2O5), titanium oxide (for example, titanium dioxide: TiO2), or niobium oxide (for example, niobium pentoxide: Nb2O5).

[0023] The first optical multilayer coating 3A may include a third layer (not shown) in addition to the first layer 31 and the second layer 32. The third layer has a refractive index different from that of the first layer 31 and the second layer 32. The first optical multilayer coating 3A may include the first layer 31, the second layer 32, and the third layer in any desired order. The same applies to the second optical multilayer coating 3B.

[0024] The first optical multilayer film 3A has the following physical properties (A) to (D): (A) maximum reflectance R(5°) for light having a wavelength of 450 nm to 650 nm at an incident angle of 5° 450~650max (B) The maximum reflectance R(30°) for light with a wavelength of 450 nm to 650 nm at an incident angle of 30° is 2.00% or less. 450~650max(C) The wavelength λ(5°) of light at an incident angle of 5° that exhibits a reflectance of 30% is 365 nm to 425 nm. (D) The wavelength λ(30°) of light at an incident angle of 30° that exhibits a reflectance of 30% is 365 nm to 425 nm.

[0025] The reflectance of the first optical multilayer film 3A is the ratio of the intensity of light reflected by the first optical multilayer film 3A (including the interface between the first optical multilayer film 3A and the transparent substrate 2) to the intensity of light incident on the first optical multilayer film 3A at a desired angle of incidence from the side opposite the transparent substrate 2 (the left side in FIG. 2). Here, "reflected light" includes only specularly reflected light and does not include diffusely reflected light.

[0026] The light reflected by the first optical multilayer film 3A does not include light reflected by the second optical multilayer film 3B (including the interface between the second optical multilayer film 3B and the transparent substrate 2). Furthermore, if the second optical multilayer film 3B is not present, the light reflected by the first optical multilayer film 3A does not include light reflected by the second main surface 22 of the transparent substrate 2. In this specification, the reflectance of the first optical multilayer film 3A means the reflectance of one side of the optical element 1, not the reflectance of both sides of the optical element 1.

[0027] The reflectance of the first optical multilayer film 3A is calculated by a simulation using, for example, optical thin film calculation software (TFCalc (registered trademark) manufactured by Software Spectra, Inc.).

[0028] The reflectance of the first optical multilayer coating 3A can also be measured using a commercially available spectrophotometer. When measuring the reflectance of the first optical multilayer coating 3A using a commercially available spectrophotometer, the second optical multilayer coating 3B is removed, and then the second main surface 22 of the transparent substrate 2 is roughened to scatter light, or black ink is applied to the second main surface 22 of the transparent substrate 2 to absorb light. As described above, the second optical multilayer coating 3B may have any configuration and may not be formed. Examples of commercially available spectrophotometers include an ultraviolet-visible-near-infrared spectrophotometer (manufactured by Hitachi High-Tech Corporation, product name UH-4150) or an ultraviolet-visible-near-infrared spectrophotometer (manufactured by JASCO Corporation, V-770).

[0029] The first optical multilayer film 3A has the physical properties (A) to (D) described above, so that the reflectance of visible light from blue to red (visible light with wavelengths of 450 nm to 650 nm) can be suppressed to 2.00% over a wide range of incident angles, while maintaining the reflectance of violet visible light at 30% or more. As a result, even if the angle of the line of sight to the optical member 1 changes, the change in the color of the optical member 1 can be suppressed. More specifically, even if the angle of the line of sight to the optical member 1 changes, the color of the optical member 1 can be maintained in the range from purple to blue.

[0030] It should be noted that, as a means of suppressing changes in the color of the optical member 1 due to changes in the angle of the line of sight relative to the optical member 1, it is conceivable to maintain the color of the optical member 1 in red even when the angle of the line of sight relative to the optical member 1 changes, but this is more difficult to achieve than maintaining the color in the range from purple to blue. This is clear from Figures 3 to 8.

[0031] 3 to 8 are diagrams showing the reflectance of the optical multilayer coatings of Examples 1 to 6, which will be described later. As is clear from these figures, as the angle of incidence increases, the wavelength range in which the reflectance is 2.00% or less shifts toward shorter wavelengths. Furthermore, this shift is more pronounced in the red wavelength range than in the blue wavelength range. That is, in the red wavelength range, the wavelength at which the reflectance is maximum changes with a change in the angle of incidence more than in the blue wavelength range, and the color of the reflected light also changes more with a change in the angle of incidence. Therefore, it is difficult to maintain the color of the optical member 1 in red while suppressing the reflectance to 2.00% or less over a wide wavelength range from 450 nm to 650 nm.

[0032] Furthermore, as a means for suppressing changes in the color tone of the optical member 1 due to changes in the angle of the line of sight relative to the optical member 1, it is conceivable to configure an optical multilayer film so that a specific color tone is not visible on the optical member 1 even when the angle of the line of sight relative to the optical member 1 changes (i.e., so that the reflected light is colorless). However, in order to configure an optical multilayer film so that the reflected light is colorless, the optical multilayer film is configured so that the maximum reflectance in the wavelength range of visible light is below a certain level (for example, 1% or less) even when the angle of incidence increases. This would require a large number of layers in the optical multilayer film, which is difficult to achieve in terms of manufacturing cost, productivity, warping, etc.

[0033] According to this embodiment, the first optical multilayer film 3A has the physical properties (A) to (D) described above so that the color of the optical member 1 is not colorless but is intentionally maintained between purple and blue even when the angle of the line of sight relative to the optical member 1 changes. Therefore, according to this embodiment, even when the angle of the line of sight relative to the optical member 1 changes, it is possible to suppress changes in the color of the optical member 1. This effect is remarkable when the optical member 1 is used in a wearable device.

[0034] For example, if a wearable device includes an optical member 1 for the right eye and an optical member 1 for the left eye, and the observer is standing to the right or left of the center of the wearable device in the horizontal direction, the angle of the observer's line of sight with respect to the optical members for the right eye and the left eye will be different. Even in this case, the optical members 1 for the right eye and the left eye will appear to have the same color, which is good for design.

[0035] R(5°) 450~650max is, for example, 0.01% to 2.00%, preferably 0.05% to 1.50%, and more preferably 0.10 to 1.20%. 450~650max If R(5°) is 2.00% or less, it is easy to maintain the color of reflected light in the purple to blue range. 450~650max If the ratio is 0.01% or more, the number of layers in the optical multilayer film can be reduced, resulting in good manufacturing costs and productivity.

[0036] R(30°) 450~650maxis, for example, 0.01% to 2.00%, preferably 0.05% to 1.50%, and more preferably 0.10 to 1.20%. R(30°) 450~650max If R(30°) is 2.00% or less, it is easy to maintain the color of reflected light in the purple to blue range. 450~650max If the ratio is 0.01% or more, the number of layers in the optical multilayer film can be reduced, resulting in good manufacturing costs and productivity.

[0037] λ(5°) is, for example, 365 nm to 425 nm, and preferably 380 nm to 410 nm. λ(30°) is, for example, 365 nm to 425 nm, and preferably 380 nm to 410 nm. If λ(5°) and λ(30°) are 365 nm to 425 nm, it is easy to maintain the color tone of the reflected light in the purple to blue range.

[0038] The first optical multilayer film 3A preferably has the following physical properties (E) to (F) in addition to the above properties (A) to (D): (E) Reflectance R(5°) for light with a wavelength of 950 nm at an incident angle of 5° 950 (F) Reflectance R(5°) for light with a wavelength of 1350 nm at an incident angle of 5° is 10.00% or less. 1350 is 15.00% or less.

[0039] The first optical multilayer film 3A having the above physical properties (E) to (F) can transmit near-infrared light, and can be suitably used as an optical component for sensing using near-infrared light. In this case, the transparent substrate 2 transmits not only visible light but also near-infrared light.

[0040] R(5°) 950 is, for example, 0.01% to 10.00%, and preferably 0.10% to 8.00%. 1350 is, for example, 0.01% to 15.00%, and preferably 0.10% to 11.00%.

[0041] The first optical multilayer film 3A is only required to have the properties (A) to (D) above, and does not necessarily have the properties (E) to (F) above. In addition to anti-reflection of visible light, the first optical multilayer film 3A may also have functions such as blocking infrared or ultraviolet light, anti-fouling, anti-dust, or improving durability.

[0042] From the viewpoint of improving productivity and suppressing warpage, the number of layers in the first optical multilayer film 3A is preferably 15 or less, and more preferably 13 or less. Moreover, from the viewpoint of low reflectivity of visible light, the number of layers in the first optical multilayer film 3A is preferably 5 or more, and more preferably 7 or more.

[0043] The thickness of the first optical multilayer film 3A is preferably 1000 nm or less, more preferably 700 nm or less, from the viewpoint of improving productivity and suppressing warpage, and is preferably 300 nm or more, more preferably 400 nm or more, from the viewpoint of low reflectivity of visible light.

[0044] The first optical multilayer coating 3A may be formed by either a dry method or a wet method. Dry methods include sputtering, ion-assisted deposition (IAD), and thermal evaporation. Wet methods include spraying and dipping.

[0045] In this embodiment, the optical member 1 does not include anything between the first optical multilayer film 3A and the transparent substrate 2, but may include an adhesion-strengthening film or the like. The adhesion-strengthening film increases the adhesion between the first optical multilayer film 3A and the transparent substrate 2. In addition, an ultraviolet absorbing film or an ultraviolet reflective film may be formed between the first optical multilayer film 3A and the transparent substrate 2.

[0046] The warpage of the optical member 1 is preferably 20 μm to 120 μm. If the warpage of the optical member 1 is 120 μm or less, the influence of distortion on the transmission image is small. On the other hand, if the warpage of the optical member 1 is 20 μm or more, the physical film thickness of the optical multilayer film, which is a factor in the occurrence of warpage of the optical member 1, can be increased, making it easier to obtain desired optical characteristics. Furthermore, if the warpage of the optical member 1 is 20 μm or more, there is no longer any restriction to provide optical multilayer films of approximately the same physical film thickness on both sides of the transparent substrate 2 in consideration of the warpage of the optical member 1, and manufacturing costs are reduced. The warpage of the optical member 1 is more preferably 22 μm to 110 μm.

[0047] The warpage of the optical element 1 is measured using the Dyvoce surface profile measurement system (model number: K2-310) manufactured by Kohzu Seiki Co., Ltd., as follows: First, the periphery of the rear surface of the optical element 1 (e.g., the second principal surface 22 of the transparent substrate 2) is supported at three points, and the shape of the surface of the optical element 1 (e.g., the surface of the first optical multilayer film 3A) is measured using a laser displacement meter. The warpage is calculated using the Dyvoce system from the measurement results. The warpage is calculated by using a plane that approximates the surface of the optical element 1 using the least squares method as the reference height, and then subtracting the component of self-weight deflection of the optical element 1 from the height difference (>0) between the highest and lowest points on the surface of the optical element 1. To subtract the component of self-weight deflection, the optical element 1 is turned upside down and the periphery of the surface of the optical element 1 is supported at three points. The shape of the rear surface of the optical element 1 is measured using a laser displacement meter, and the difference between the rear surface shape and the surface shape is calculated, thereby eliminating the component of self-weight deflection. [Example]

[0048] Experimental data will be explained below. Examples 1 to 3 below are working examples, and Examples 4 to 6 are comparative examples.

[0049] (Examples 1 to 6) In Examples 1 to 6, a glass substrate was prepared as a transparent substrate, and an optical multilayer film (more specifically, an anti-reflection film) was formed only on the first main surface of the glass substrate by sputtering to produce an optical member. The glass substrate prepared in Examples 1 to 6 was a soda-lime glass substrate (manufactured by AGC Corporation, product name AS2, length 100 mm, width 100 mm, thickness 0.4 mm). The anti-reflection film formed in Examples 1 to 6 was an alternating laminate of a first layer made of SiO2 (refractive index 1.48) and a second layer made of TiO2 (refractive index 2.47).

[0050] The layer structure of the optical multilayer film of Example 1 is shown in Table 1. The film thicknesses shown in Tables 1 to 6 are physical film thicknesses.

[0051] [Table 1] In Table 1, the layer numbers of the optical multilayer film indicate the order in which the layers were stacked. In the optical multilayer film, the layer with layer number 1 was in contact with the first main surface of the glass substrate, and the layer with layer number 11 was in contact with air. The optical multilayer film of Example 1 had 11 layers and a film thickness of 651.12 nm.

[0052] The layer structure of the optical multilayer film of Example 2 is shown in Table 2.

[0053] [Table 2] In Table 2, the layer numbers of the optical multilayer film indicate the order in which the layers were stacked. In the optical multilayer film, the layer with layer number 1 was in contact with the first main surface of the glass substrate, and the layer with layer number 10 was in contact with air. The optical multilayer film of Example 2 had 10 layers and a film thickness of 415.12 nm.

[0054] The layer structure of the optical multilayer film of Example 3 is shown in Table 3.

[0055] [Table 3] In Table 3, the layer numbers of the optical multilayer film indicate the order in which the layers were stacked. In the optical multilayer film, the layer with layer number 1 was in contact with the first main surface of the glass substrate, and the layer with layer number 11 was in contact with air. The optical multilayer film of Example 3 had 11 layers and a film thickness of 532.98 nm.

[0056] The layer structure of the optical multilayer film of Example 4 is shown in Table 4.

[0057] [Table 4] In Table 4, the layer numbers of the optical multilayer film indicate the order in which the layers were stacked. In the optical multilayer film, the layer with layer number 1 was in contact with the first main surface of the glass substrate, and the layer with layer number 9 was in contact with air. The optical multilayer film of Example 4 had 9 layers and a film thickness of 445.46 nm.

[0058] The layer structure of the optical multilayer film of Example 5 is shown in Table 5.

[0059] [Table 5] In Table 5, the layer numbers of the optical multilayer film indicate the order in which the layers were stacked. In the optical multilayer film, the layer with layer number 1 was in contact with the first main surface of the glass substrate, and the layer with layer number 7 was in contact with air. The optical multilayer film of Example 5 had seven layers and a film thickness of 833.10 nm.

[0060] The layer structure of the optical multilayer film of Example 6 is shown in Table 6.

[0061] [Table 6] In Table 6, the layer numbers of the optical multilayer film indicate the order in which the layers were stacked. In the optical multilayer film, the layer with layer number 1 was in contact with the first main surface of the glass substrate, and the layer with layer number 5 was in contact with air. The optical multilayer film of Example 6 had five layers and a film thickness of 304.67 nm.

[0062] (Optical properties) The optical properties of the optical members produced in Examples 1 to 6 will be described below, mainly with reference to Figures 3 to 8 and Table 7. The reflectances shown in Figures 3 to 8 and Table 7 and the color of reflected light shown in Table 7 were calculated by simulation using optical thin film calculation software (TFCalc (registered trademark) manufactured by Software Spectra, Inc.).

[0063] [Table 7] In Table 7, "color of 5° reflected light" refers to the color of light reflected by the optical multilayer film at a reflection angle of 5° when white light is incident perpendicularly (i.e., at an incident angle of 0°) on the optical multilayer film from the side opposite the transparent substrate. Similarly, "color of 30° reflected light" refers to the color of light reflected by the optical multilayer film at a reflection angle of 30° when white light is incident perpendicularly on the optical multilayer film from the side opposite the transparent substrate. Color is measured according to CIE 1976 (L * ,a * ,b * ) It is expressed as color space coordinates and the apparent color.

[0064] As shown in Table 7, the optical multilayer films of Examples 1 to 3 had all of the above physical properties (A) to (D), unlike the optical multilayer films of Examples 4 to 6. That is, the optical multilayer films of Examples 1 to 3 had R(5°) 450~650max is 2.00% or less, R(30°) 450~650max was 2.00% or less, λ(5°) was 365 nm to 425 nm, and λ(30°) was 365 nm to 425 nm. As a result, unlike the optical multilayer films of Examples 4 to 6, the optical multilayer films of Examples 1 to 3 were able to maintain the color tone of the optical member from purple to blue even when the angle of the line of sight to the optical member changed.

[0065] Although the optical member according to the present disclosure has been described above, the present disclosure is not limited to the above-described embodiments, etc. Various changes, modifications, substitutions, additions, deletions, and combinations are possible within the scope of the claims. These naturally fall within the technical scope of the present disclosure. [Explanation of symbols]

[0066] 1 Optical components 2 transparent substrate 21 Main side 1 22 2nd main side 3A First Optical Multilayer Film (Optical Multilayer Film) 3B Second optical multilayer film (optical multilayer film) 31. First Floor 32. Second Floor

Claims

1. An optical member comprising a transparent substrate that transmits visible light and an optical multilayer film provided on at least one main surface of the transparent substrate, The optical multilayer film provided on the one main surface of the transparent substrate has: (A) a maximum reflectance R(5°) for light having a wavelength of 450 nm to 650 nm at an incident angle of 5° ４５０～６５０ｍａｘ (B) the maximum reflectance R(30°) for light having a wavelength of 450 nm to 650 nm at an incident angle of 30° is 2.00% or less; ４５０～６５０ｍａｘ (C) the wavelength λ(5°) of light at an incident angle of 5°, which exhibits a reflectance of 30%, is in the range of 365 nm to 425 nm, and (D) the wavelength λ(30°) of light at an incident angle of 30°, which exhibits a reflectance of 30%, is in the range of 365 nm to 425 nm.

2. The optical multilayer film provided on the one main surface of the transparent substrate has a reflectance R(5°) for light having a wavelength of 950 nm at an incident angle of 5°. ９５０ (F) reflectance R(5°) for light having a wavelength of 1350 nm at an incident angle of 5° １３５０ The optical member according to claim 1 , wherein the ratio of the total surface area to the total surface area is 15.00% or less.

3. The optical member according to claim 1 , wherein the transparent substrate is a glass substrate.

4. The optical member according to claim 1 , wherein the optical multilayer film provided on the one main surface of the transparent substrate has 15 or less layers.

5. 2. The optical member according to claim 1, wherein the warpage of the optical member is 20 μm to 120 μm.

6. The optical member according to claim 1 , which is used in a wearable device.

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