JPH11149063A - Spectacle lens with antireflection film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide spectacle lenses with antireflection films having the appearance equal to the appearance of conventional spectacle lenses and antireflection function and further, having an electromagnetic wave shielding function. SOLUTION: The spectacle lens 1A with the antireflection films is constituted by providing the spectacle lens 2 having a refractive index of 1.55 to 1.75 with a reflection preventive film 9 composing a layer 3 consisting of SiO2 of an optical film thickness 46 to 60 nm as the first layer of the layer nearest the spectacle lens face, a layer 4 consisting of an ITO film of an optical film thickness 65 to 79 nm as a second layer, a layer 5 consisting of SiO2 of an optical film thickness 18 to 22 nm as a third layer, a layer 6 consisting of a material contg. at least one among TiO2 , ZrO2 , Ta2 O5 of an optical film thickness 200 to 254 nm as a fourth layer and a layer 7 consisting of SiO2 of an optical film thickness 105 to 126 nm as a fifth layer. The spectacle lens 2 may be provided with a hard-coating layer 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectacle lens with an antireflection film, and more particularly to a spectacle lens with an antireflection film having an electromagnetic wave shielding function.

[0002]

2. Description of the Related Art Generally, a spectacle lens has a refractive index at an optical interface between an air and a spectacle lens in order to prevent scattering of light of the spectacle lens substrate itself and maintain a good visibility, or to adjust a refractive index at an optical interface between the air and the spectacle lens. An anti-reflection film is formed on the surface for the purpose.
Such an antireflection film is usually formed by alternately laminating a high refractive index layer and a low refractive index layer.

In recent years, with the spread of OA equipment such as computers and personal computers, the effect of electromagnetic waves emitted from a display device using a cathode ray tube (CRT) on the human body has become a problem. However, when facing the display screen, there is no special protection for the eyes that are expected to be strongly affected by electromagnetic waves, and a spectacle lens with an antireflection film that simultaneously provides an antireflection function and an electromagnetic wave shielding function is required. Have been.

On the other hand, as means for protecting a human body from electromagnetic waves emitted from a CRT, an anti-reflection film or the like to be adhered to a screen surface of a CRT display device has been devised. For example, Japanese Patent Application Laid-Open No. 9-80205 discloses a CRT having an ITO film functioning as a high refractive index layer on a plastic substrate and having an electromagnetic wave shielding function by being laminated with a low refractive index layer.
An anti-reflection film for panels and the like is disclosed.

However, the light reflection preventing film for a CRT panel disclosed in Japanese Patent Application Laid-Open No. 9-80205 has an antireflection function and an electromagnetic wave shielding function. In the case where it is provided, it cannot exhibit the same transmittance, reflectance, and reflection characteristics as reflected color such as conventional spectacle lenses, and is insufficient for use in eyeglasses.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a CR
Protects the human body, especially the eyes, from the electromagnetic waves emitted from T, and maintains the reflection characteristics such as the reflection color of the conventional spectacle lens and the high transmittance in the visible region (around 400 nm to 700 nm), and the appearance of the conventional spectacle lens It is another object of the present invention to provide a spectacle lens with an anti-reflection film that has the same functional characteristics and can further simplify the configuration of the anti-reflection film.

[0007]

This and other objects are achieved by the present invention which is defined below as (1) to (13).

(1) In a spectacle lens with an antireflection film having a spectacle lens serving as a base material and an antireflection film in which a plurality of layers are laminated, the antireflection film includes at least one transparent conductive film. Wherein the total optical thickness of the transparent conductive film is 40 to 220 nm.

(2) The spectacle lens with the anti-reflection film according to the above (1), wherein the anti-reflection film is configured such that a refractive index change between adjacent layers alternates between an increase and a decrease.

(3) The antireflection film has a refractive index of 1.5.
The spectacle lens with an antireflection film according to the above (1) or (2), comprising at least one low refractive index layer and at least one high refractive index layer having a refractive index of 2 or more.

(4) The high refractive index layer is made of TiO ₂ , Zr
The spectacle lens with an anti-reflection film according to the above (3), which is made of a material containing at least one of O ₂ and Ta ₂ O ₅ .

(5) The spectacle lens with an antireflection film according to any one of (1) to (4), wherein the number of layers of the antireflection film is 3 to 7.

(6) The transparent conductive film has both surfaces in contact with one of the other layers constituting the anti-reflection film, or at a position in the anti-reflection film closest to the spectacle lens. The spectacle lens with an antireflection film according to any one of the above (1) to (5).

(7) The spectacle lens with an antireflection film according to any one of (1) to (6), wherein the luminous reflectance is 2% or less.

(8) The spectacle lens with an antireflection film according to any one of (1) to (7), wherein in the visible region, the difference between the reflectances of light beams having different incident directions is 0.5% or less.

(9) In the spectacle lens, a layer closest to the spectacle lens is used as a first layer, and an S layer having an optical film thickness of 46 to 60 nm is used.
a layer made of iO _2, and a second layer having an optical thickness of 65 to 7
A 9-nm layer made of an ITO film, a third layer made of SiO ₂ having an optical thickness of 18 to 22 nm, and a fourth layer made of TiO ₂ , ZrO ₂ , and Ta having an optical thickness of 200 to 254 nm.
_A layer made of a material containing at least one of ₂ O ₅ ,
A spectacle lens with an anti-reflection film, wherein an anti-reflection film composed of a fifth layer and a layer made of SiO ₂ having an optical film thickness of 103 to 126 nm is provided.

(10) An optical film thickness of 25.2-46.8, with the layer closest to the spectacle lens as the first layer.
and a second layer having an optical film thickness of 1 nm.
A layer made of SiO ₂ having a thickness of 2.0 to 26.0 nm, and TiO ₂ and Zr having an optical thickness of 52.5 to 97.5 nm as a third layer.
A layer made of a material containing at least one of O ₂ and Ta ₂ O ₅ , and a fourth layer having an optical thickness of 25.2 to 46.8.
a layer made of an ITO film having a thickness of 5 nm and an optical film thickness of 6 as a fifth layer.
TiO ₂ of 1.2~113.8nm, ZrO _2, Ta ₂ O
_A layer made of a material containing at least one of
SiO ₂ having an optical film thickness of 87.5 to 162.5 nm as a layer
A spectacle lens with an anti-reflection film, comprising an anti-reflection film constituted by a layer comprising:

(11) The spectacle lens has a refractive index of 1.5
The spectacle lens with an antireflection film according to any one of the above (1) to (10), wherein the number is 5 to 1.75.

(12) The spectacle lens with an antireflection film according to any one of (1) to (11), wherein the spectacle lens is provided with a hard coat layer.

(13) The hard coat layer has a thickness of 1.
The spectacle lens with an anti-reflection film according to the above (12), which has a refractive index of 0 to 2.5 μm and the same refractive index as the spectacle lens.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spectacle lens with an antireflection film according to the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings.

FIG. 1 is a partial sectional view showing an embodiment of a spectacle lens with an antireflection film according to the present invention. As shown in the figure,
The spectacle lens 1A with an antireflection film of the present invention is roughly divided into the spectacle lens 2, a hard coat layer 8, and an antireflection film 9 composed of a laminate of five layers.

Hereinafter, each of these components will be sequentially described. The base material of the spectacle lens 2 is not particularly limited, and includes, for example, various colorless or colored transparent glass materials or plastic materials. Specific examples of the plastic material include acrylic resin, polycarbonate resin,
Polystyrene-based resins, polyvinyl ester-based resins, polyurethane-based resins, and the like are included.

The refractive index of the spectacle lens 2 is not particularly limited, but is preferably about 1.55-1.75. Here, the refractive index means a refractive index at a wavelength of 550 nm (the same applies hereinafter).

The surface shape of the spectacle lens 2 on which the antireflection film 9 is provided may be flat as shown in FIG. 1 or may be curved.

The spectacle lens 2 is preferably provided with a hard coat layer 8. Thereby, the spectacle lens 2
Can improve physical properties such as surface hardness, and can improve the adhesion (adhesion strength) between the spectacle lens 2 and the antireflection film 9 described later. The hard coat layer 8 preferably has a thickness of 1.0 to 2.5 μm and has the same refractive index as the spectacle lens 2. By setting the thickness in this range, the above-described effect can be obtained without changing the transmittance of the spectacle lens 2. Further, by having the same refractive index as the spectacle lens 2, it becomes easy to maintain the optical characteristics of the spectacle lens substrate.

The constituent material of the hard coat layer 8 is not particularly limited, and may be a silicon material, a polyfunctional acrylic material,
Examples include urethane resin-based materials and melamine resin-based materials.

Examples of the silicon-based material include a co-hydrolyzate of a tetraalkoxysilane or an alkyltrialkoxysilane and a silane coupling agent having a functional group such as an epoxy group or a methacryl group.

The polyfunctional acrylic material includes, for example, polyol acrylate, polyester acrylate, urethane acrylate, epoxy acrylate and the like. Further, as the urethane-based material, melamine polyurethane and the like can be mentioned.

The method of forming the hard coat layer 8 is not particularly limited. For example, the hard coat layer 8 can be formed by various coating methods such as a dipping coating method, a spin coating method, a spray coating method, and a flow coating method.

The spectacle lens 2 is provided with an antireflection film 9 in which a plurality of layers are laminated. It is preferable that the antireflection film 9 is configured so that the refractive index change between adjacent layers alternates between increasing and decreasing. With such a configuration, an antireflection effect can be obtained,
Further, the layer configuration of the antireflection film 9 can be simplified.

Further, it is possible to minimize the difference between the reflectance and the reflection color of light rays having different incident directions with respect to the spectacle lens, for example, visible light incident from the front and back surfaces of the spectacle lens. In particular, when the antireflection film 9 includes two or more ITO films, this effect is more effectively exhibited.

For example, it is preferable to include at least one low refractive index layer having a refractive index of 1.5 or less and at least one high refractive index layer having a refractive index of 2 or more. Thereby, the anti-reflection effect can be further improved.

The constituent material of the high refractive index layer is not particularly limited. For example, the high refractive index layer is preferably formed of a material containing at least one of TiO ₂ , ZrO ₂ and Ta ₂ O ₅ .

By using such a material, a thin film having high refractive index and high durability can be formed.

The optical thickness of each high refractive index layer is preferably about 50 to 270 nm, more preferably about 60 to 245 nm in terms of optical thickness. By setting the optical film thickness in this range, a sufficient antireflection film effect can be obtained without impairing the characteristics of the spectacle lens 2.

When a plurality of high refractive index layers are formed, the constituent materials and the optical film thickness of each layer may be the same or different.

The low refractive index layer of the material is not particularly limited configured, for example, preferably it is composed of a material containing at least one of SiO _2, MgF _2, etc., among others of SiO ₂ Are particularly preferred. By using such a material, a laminate having high durability and good adhesion to an adjacent layer can be obtained.

The optical film thickness of each low refractive index layer is preferably about 5 to 200 nm, more preferably about 10 to 120 nm. By setting the optical film thickness in this range, a sufficient antireflection effect can be obtained without impairing the characteristics of the spectacle lens 2.

When a plurality of low refractive index layers are formed, the constituent materials and optical thicknesses of each layer may be the same or different.

The method of forming the high refractive index layer and the low refractive index layer is not particularly limited, and is performed by, for example, various vapor deposition methods such as vacuum deposition, plasma deposition, sputtering, and ion plating. Is preferred. The refractive index, the optical film thickness, the film configuration, and the like can be easily controlled by selecting these film forming methods and film forming conditions.

The number of layers of the antireflection film 9 is preferably 3 to 7. If the number of layers is less than three, it is difficult to obtain a film having both the antireflection function and the electromagnetic wave shielding function. On the other hand, when the number of layers exceeds seven, the structure of the film cannot be simplified, the manufacturing process becomes complicated, and the cost increases.

The antireflection film 9 includes at least one transparent conductive film 4, and the total optical thickness of the transparent conductive film 4 is 40 to 220 nm.

The transparent conductive film 4 is a film having a property of transmitting visible light and having conductivity. Thereby, the antireflection film 9 can have antireflection characteristics and electromagnetic wave shielding characteristics.

Further, the total optical thickness of the transparent conductive film 4 is 40 to 220 nm. If the total optical film thickness is less than 40 nm, a sufficient electromagnetic wave shielding effect cannot be obtained. If the total optical film thickness exceeds 220 nm, the transmittance of light (visible light) deteriorates, and the reflection characteristics deteriorate (the antireflection effect decreases). There is a risk.
Furthermore, the production cost is high.

The material of the transparent conductive film 4 is not particularly limited, but may be indium tin oxide (IT
O) (Sn-doped I ₂ O ₃ ) is preferred. ITO
The film is transparent and has a low specific resistance, so that electromagnetic waves can be more effectively shielded.

The transparent conductive film 4 is provided at a position where both surfaces thereof are in contact with one of the other layers constituting the anti-reflection film 9 or in the anti-reflection film 9 in the position closest to the spectacle lens 2. Is preferred. That is, it is preferable that the antireflection film 9 is provided at a position other than the outermost layer (surface). Thereby, the antireflection effect of the antireflection film 9 is more effectively exhibited, and the surface hardness of the antireflection film 9 can be sufficiently maintained.

The transparent conductive film 4 may be formed by a usual film forming method, for example, various vapor deposition methods, plasma deposition methods, sputtering methods, ion plating methods, vapor phase film forming methods such as CVD. Is preferred. Thus, the transparent conductive film 4 can be easily made to have a predetermined optical film thickness and film configuration by selecting the above-described film forming method and film forming conditions.

The luminous reflectance of the spectacle lens 1 with the anti-reflection film on which the anti-reflection film 9 is formed is preferably 2% or less, particularly preferably 1% or less. When the luminous reflectance exceeds 2%, the antireflection function is not sufficient for use as a spectacle lens.

Further, in the visible region, the difference between the reflectances of light beams having different incident directions with respect to the spectacle lens with an antireflection film is preferably 0.5% or less, more preferably 0.3% or less. preferable. Thereby, the appearance as a spectacle lens can be more favorably maintained.

[0051]

Next, a specific embodiment of the present invention will be described with reference to the drawings.

1. Production of spectacle lens with antireflection film (Example 1)

On the spectacle lens 2 (refractive index = 1.66), a hard coat layer 8 (silane coupling agent (to which a metal sol was added), refractive index = 1.66, thickness = about 2 μm)
m) After applying the material by dipping and drying,
It was formed by a curing treatment.

Further, an antireflection film 9 consisting of five layers of 3 to 7 as shown in Table 1 was formed thereon by a vacuum evaporation method, to obtain a spectacle lens 1A with a double-sided antireflection film.

[0055]

[Table 1]

(Example 2) As shown in Table 2, an anti-reflection film 9 was formed in the same manner as in Example 1 except that the material of the high refractive index layer 6 was Ta ₂ O _5. An eyeglass lens 1A was obtained.

[0057]

[Table 2]

Example 3 As shown in Table 3, an antireflection film 9 was formed in the same manner as in Example 1 except that the material of the high refractive index layer 6 was ZrO _2, and a spectacle lens with an antireflection film was formed. 1
A was obtained.

[0059]

[Table 3]

Example 4 Eyeglass lens 2 (refractive index = 1.
66), a hard coat layer 8 (silane coupling agent (to which a metal sol is added), refractive index = 1.66, thickness = about 2 μm) is coated with a material by dipping, dried, and then cured. Formed by processing.

Further, an antireflection film 29 consisting of six layers 23 to 28 as shown in Table 4 and FIG. 2 is formed thereon by a vacuum evaporation method, and the spectacle lens 1B having a double-sided antireflection film is formed.
I got

[0062]

[Table 4]

(Example 5) As shown in Table 5, an antireflection film 29 was formed in the same manner as in Example 4 except that the material of the high refractive index layers 25 and 27 was Ta ₂ O _5. A spectacle lens 1B with a film was obtained.

[0064]

[Table 5]

Example 6 As shown in Table 6, an antireflection film 29 was formed in the same manner as in Example 4 except that the material of the high refractive index layers 25 and 27 was ZrO ₂ , An eyeglass lens 1B was obtained.

[0066]

[Table 6]

(Comparative Example) Instead of the transparent conductive film 4, Ti
A spectacle lens with an antireflection film was obtained in the same manner as in Example 1 except that the O ₂ layer was provided.

2. Evaluation of Spectral Reflection Characteristics The spectral characteristics of light reflected by the antireflection film of the spectacle lens with the antireflection film obtained in Examples 1 to 6 and Comparative Example were evaluated. Each spectral reflectance curve is shown in FIGS. 3 to 5 (Examples 1 to 3) and FIG. 19 (Comparative Example). 6 to 8 show the spectral reflectance curves of the front and back surfaces of the spectacle lens with the anti-reflection film for Examples 4 to 6, respectively. The measurement of the spectral reflectance was performed at an incident angle of 5 °.

The spectral reflection characteristics of the spectacle lenses with an antireflection film obtained in Examples 1 to 3 and Comparative Example were evaluated using a CIE chromaticity diagram.

C of reflected light of each spectacle lens with an antireflection film
Chromaticity diagrams showing positions on the IE chromaticity coordinates are shown in FIGS. 9 to 11 (Examples 1 to 3) and FIG. 20 (Comparative Example).

The spectacle lenses with anti-reflection coatings of Examples 4 to 6 were subjected to CIE for the front and back surfaces, respectively.
The spectral reflection characteristics were evaluated using a chromaticity diagram.

FIG. 12 to FIG. 17 (Examples 4 to 6) show chromaticity diagrams showing the positions on the CIE chromaticity coordinates of the reflected light on the front surface and the back surface of each spectacle lens 1B with an antireflection film.

3. Evaluation of Electromagnetic Wave Shielding Function The spectacle lenses with an antireflection film obtained in Example 1 and Comparative Example were evaluated for electromagnetic wave shielding function. FIG. 18 shows the result.

The evaluation of the electromagnetic wave shielding function was carried out in an anechoic chamber using an apparatus schematically shown in FIG.

First, a signal generator 12 (ROHDE &
SCHWARZ) via cable 13
An electromagnetic wave of a specific wavelength (frequency) was radiated from the antenna 14 surrounded by the metal cover 18. The electromagnetic wave is received by a receiver 17 ([EMI Receiver] manufactured by HP) via an antenna 15 and a cable 16 surrounded by a metal cover 18 on the receiving side.
And measures the wavelength of the received electromagnetic wave.

Next, the test lens 10 is set in the window 19, and the antenna 14 irradiates the test lens 10 with an electromagnetic wave having the same specific wavelength. The electromagnetic wave transmitted through the test lens 10 is received by the antenna 15, and the wavelength of the electromagnetic wave is measured by the receiver 17. The test lens 1 is calculated by taking the ratio of the two measured values.
An electromagnetic wave shielding effect (attenuation amount) of 0 is calculated. The measurement was performed several times in the same manner while changing the frequency (wavelength) of the electromagnetic wave.

From the above results, the spectacle lenses with anti-reflection coatings of Examples 1 to 6 have the same amount of reflected light and the same color as the spectacle lens of the comparative example, and have almost no difference in transmittance. It was found to have similar optical properties. In the case of Examples 4 to 6, when the incident direction of light to the spectacle lens with an antireflection film is different, for example, the difference between the reflectance and the reflection color on the front and back surfaces of the spectacle lens is extremely small,
A better appearance as a spectacle lens was obtained.

Further, it was found that the spectacle lens with the antireflection film of Example 1 exhibited an electromagnetic wave shielding function. In particular, the electromagnetic wave range emitted from the CRT is 1 to 100 [MHz.
], Attenuation of electromagnetic waves was observed. When the same electromagnetic wave shielding function evaluation was performed on the spectacle lenses with an antireflection film of Examples 2 to 6, almost the same results were obtained.

On the other hand, the spectacle lens with the anti-reflection film of the comparative example showed almost no attenuation of electromagnetic waves.

The spectacle lens with an anti-reflection film of the present invention has been described above. However, the present invention is not limited to these.
In order to obtain an antistatic effect or the like, another intermediate layer, a surface layer, an underlayer, or the like may be provided. In addition, an element necessary for improving adhesion or the like may be added to a constituent material of each layer of the antireflection film as long as the effects of the present invention are not impaired.

Further, the antireflection films provided on both surfaces of the spectacle lens may have the same or different configurations.

[0082]

As described above, according to the spectacle lens with the antireflection film of the present invention, the electromagnetic wave emitted from the CRT or the like is shielded while having the same appearance and antireflection function as the conventional spectacle lens. Function can be demonstrated,
The effect of electromagnetic waves on the human body, especially on the eyes, can be reduced.

Although the spectacle lens is newly provided with an electromagnetic wave shielding function, the feeling of wearing, the feeling of use, etc. are not different from those of the conventional product. Further, when the incident direction of light to the spectacle lens is different, for example, the reflectance and the reflected color of the incident light on the front surface and the back surface of the lens are almost the same as those of the conventional one, and are not used only for work in front of the display screen of the OA device. Instead, it can also be used as normal eyesight correction glasses.

Further, since the transparent conductive film is provided in the antireflection film, it is not necessary to form a special layer structure.
The configuration of the antireflection film can be simplified, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a configuration example of a spectacle lens with an antireflection film of the present invention.

FIG. 2 is a schematic sectional view showing another example of the configuration of the spectacle lens with an antireflection film of the present invention.

FIG. 3 is a view showing a spectral reflectance curve of the spectacle lens with an antireflection film shown in FIG.

FIG. 4 is a diagram showing a spectral reflectance curve of the spectacle lens with an antireflection film of Example 2.

FIG. 5 is a diagram showing a spectral reflectance curve of the spectacle lens with an antireflection film of Example 3.

FIG. 6 is a diagram showing a spectral reflectance curve of the spectacle lens with an antireflection film of Example 4.

FIG. 7 is a diagram showing a spectral reflectance curve of the spectacle lens with an antireflection film of Example 5.

FIG. 8 is a diagram showing a spectral reflectance curve of the spectacle lens with an antireflection film of Example 6.

9 is a diagram showing a CIE chromaticity diagram of reflected light of the spectacle lens with the antireflection film shown in FIG.

FIG. 10 is a diagram showing a CIE chromaticity diagram of reflected light of the spectacle lens with an antireflection film of Example 2.

FIG. 11 is a diagram showing a CIE chromaticity diagram of reflected light of the spectacle lens with an antireflection film of Example 3.

FIG. 12 is a diagram showing a CIE chromaticity diagram of the reflected light on the surface of the spectacle lens with an antireflection film of Example 4.

FIG. 13 is a diagram showing a CIE chromaticity diagram of the reflected light on the back surface of the spectacle lens with an antireflection film of Example 4.

FIG. 14 is a diagram showing a CIE chromaticity diagram of the reflected light on the surface of the spectacle lens with an antireflection film of Example 5.

FIG. 15 is a diagram showing a CIE chromaticity diagram of the reflected light on the back surface of the spectacle lens with the antireflection film of Example 5.

FIG. 16 is a diagram showing a CIE chromaticity diagram of the reflected light on the surface of the spectacle lens with an antireflection film of Example 6.

FIG. 17 is a diagram showing a CIE chromaticity diagram of the reflected light on the back surface of the spectacle lens with the antireflection film of Example 6.

FIG. 18 is a diagram showing attenuation of an electromagnetic wave transmitted through a spectacle lens with an antireflection film.

FIG. 19 is a diagram showing a spectral reflectance curve of a conventional spectacle lens with an antireflection film.

FIG. 20 is a diagram showing a CIE chromaticity diagram of reflected light of a conventional spectacle lens with an antireflection film.

FIG. 21 is a schematic view of an apparatus used for evaluating an electromagnetic wave shielding function.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1A Eyeglass lens with an antireflection film 1B Eyeglass lens with an antireflection film 2 Eyeglass lens 3 Low refractive index layer (SiO ₂ film) 4 Transparent conductive film (ITO) 5 Low refractive index layer (SiO ₂ film) 6 High refractive index layer (TiO ₂ film) 7 Low refractive index layer (SiO ₂ film) 8 Hard coat layer 9 Anti-reflection film 10 Test lens 12 Signal generator 13 Cable 14 Antenna 15 Antenna 16 Cable 17 Receiver 18 Cover 19 Window 23 Transparent conductive film ( (ITO) 24 Low refractive index layer (SiO ₂ film) 25 High refractive index layer (TiO ₂ film) 26 Transparent conductive film (ITO) 27 High refractive index layer (TiO ₂ film) 28 Low refractive index layer (SiO ₂ film) 29 Anti-reflective coating

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 16, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction contents]

The material of the transparent conductive film 4 is not particularly limited, but may be indium tin oxide (IT
O) (Sn-doped In ₂ O ₃ ) is preferred. IT
The O film is transparent, has a low specific resistance value, and can more effectively shield electromagnetic waves.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0075

[Correction method] Change

[Correction contents]

First, a signal generator (signal generator) without the test lens 10 is used.
Signals were transmitted from a cable 12 (manufactured by ROHDE & SCHWARZ) via a cable 13, and an electromagnetic wave having a specific wavelength (frequency) was radiated from an antenna 14 surrounded by a metal cover 18. This electromagnetic wave is received by a receiver 17 via a cable 16 and an antenna 15 surrounded by a metal cover 18 on the receiving side.
([EMI Receiver] HP) and measure the power of the received electromagnetic wave.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0076

[Correction method] Change

[Correction contents]

Next, the test lens 10 is set in the window 19, and the antenna 14 irradiates the test lens 10 with an electromagnetic wave having the same specific wavelength. The electromagnetic wave transmitted through the test lens 10 is received by the antenna 15 and the power of the electromagnetic wave is measured by the receiver 17. The test lens 1 is calculated by taking the ratio of the two measured values.
An electromagnetic wave shielding effect (attenuation amount) of 0 is calculated. The measurement was performed several times in the same manner while changing the frequency (wavelength) of the electromagnetic wave.

Claims (13)

[Claims] 1. A spectacle lens having an antireflection film having a spectacle lens serving as a base material and an antireflection film in which a plurality of layers are laminated, wherein the antireflection film includes at least one transparent conductive film. And the total optical thickness of the transparent conductive film is 40 to 22.
A spectacle lens with an antireflection film, characterized in that the thickness is 0 nm. 2. The spectacle lens with an anti-reflection film according to claim 1, wherein the anti-reflection film is configured such that a refractive index change between adjacent layers alternately increases and decreases. 3. The reflection according to claim 1, wherein the antireflection film includes at least one low refractive index layer having a refractive index of 1.5 or less and at least one high refractive index layer having a refractive index of 2 or more. A spectacle lens with a protective film. 4. The high refractive index layer is made of TiO ₂ , ZrO ₂ ,
With antireflection film spectacle lens according to claim 3 which is made of a material containing at least one of Ta ₂ O _5. 5. The spectacle lens with an antireflection film according to claim 1, wherein the number of layers of the antireflection film is 3 to 7. 6. The transparent conductive film is provided at a position where both surfaces thereof are in contact with one of the other layers constituting the antireflection film or in the antireflection film closest to the spectacle lens. The spectacle lens with an antireflection film according to any one of claims 1 to 5, wherein 7. The spectacle lens with an antireflection film according to claim 1, wherein the luminous reflectance is 2% or less. 8. The spectacle lens with an anti-reflection film according to claim 1, wherein a difference between reflectances of light rays having different incident directions in a visible region is 0.5% or less. 9. A spectacle lens, the layer closest to the spectacle lens lens as the first layer, SiO optical thickness 46～60Nm ₂
A second layer made of an ITO film having an optical thickness of 65 to 79 nm, a third layer made of SiO ₂ having an optical thickness of 18 to 22 nm, and a fourth layer made of an optical film. 200-254 nm thick TiO ₂ ,
An anti-reflection film comprising a layer made of a material containing at least one of ZrO ₂ and Ta ₂ O ₅ and a fifth layer made of SiO ₂ having an optical film thickness of 103 to 126 nm is provided. A spectacle lens with an anti-reflective coating. 10. A spectacle lens, a layer closest to the spectacle lens as a first layer, an ITO film having an optical film thickness of 25.2-46.8 nm, and a second layer having an optical film thickness of 12.2. 0-26.0 nm SiO
A layer comprising the _2, TiO optical thickness 52.5~97.5nm as the third layer
₂ , a layer made of a material containing at least one of ZrO ₂ and Ta ₂ O ₅ , and a fourth layer of ITO having an optical film thickness of 25.2 to 46.8 nm.
And a fifth layer of Ti having an optical film thickness of 61.2 to 113.8 nm.
A layer made of a material containing at least one of O ₂ , ZrO ₂ , and Ta ₂ O ₅ ; and a sixth layer made of Si having an optical film thickness of 87.5 to 162.5 nm
A spectacle lens with an anti-reflection film, comprising an anti-reflection film comprising an O ₂ layer. 11. The spectacle lens having a refractive index of 1.55 to 1.55.
The spectacle lens with an antireflection film according to any one of claims 1 to 10, which has a ratio of 1.75. 12. The spectacle lens with an antireflection film according to claim 1, wherein a hard coat layer is provided on the spectacle lens. 13. The hard coat layer has a thickness of 1.0 to 1.0.
The spectacle lens with an antireflection film according to claim 12, which has a refractive index of 2.5 µm and the same refractive index as the spectacle lens.