JP2001290112A - Mirror coated lens made of plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide mirror coated lenses which are made of plastic, are enhanced in the antireflection effect of the concave surfaces of the lenses and are lessened in reflection without impairing the reflection increasing effect of the convex surfaces of the lenses. SOLUTION: Function films of the lenses which are provided with function films on the convex surfaces of a plastic substrate for the lenses and of which the convex surfaces have the reflection increasing effect and the concave surfaces have the antireflection effect are the films laminated with a first layer to a sixth layer successively from the surface of the plastic substrate. The respective layers consist of specified material and have specific film thicknesses and transmittance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic mirror-coated lens, and more particularly, to a lens surface (convex surface) having a reflection increasing effect, a lens back surface (concave surface) having an anti-reflection effect, and further having a light absorbing property. The present invention relates to a plastic mirror-coated lens having:

[0002]

2. Description of the Related Art Various types of sunglasses for leisure use are commercially available. Recently, especially overseas, an increasing number of sunglasses have a mirror-coated glass surface to give a metallic luster. In the sunglasses, the convex surface of the lens surface has an effect of increasing reflection, the concave surface of the back surface of the lens has an antireflection effect, and has a light absorption characteristic of a metal layer provided on the surface. For this reason, when worn as a spectacle lens, this lens has a function of being invisible to others and a mirror-like function, while having a function of viewing the scenery from the wearer. As an example of these, for example, Japanese Patent Publication No. 8-1481 and Japanese Patent Publication No. 8-1482, a lens having the above function is used as a mirror.
A lens having a specific film configuration, called a coat lens, is disclosed. However, the lenses described in these publications have a concave surface reflectance of about 4%. In addition, depending on the shape of the concave lens or the color tone of the lens due to metal absorption, the lens wearer sometimes sees the scene behind the lens wearer due to reflection on the back surface of the lens.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems. In a plastic mirror-coated lens, the effect of increasing the reflection of the convex surface of the lens and the effect of preventing the reflection of the concave lens surface are improved. Another object of the present invention is to provide a plastic mirror-coated lens with reduced reflection.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to develop a plastic mirror-coated lens having the above-mentioned preferable properties. As a result, a functional film composed of a plurality of layers is provided on the convex surface of the lens. Have been found to improve the antireflection effect of the lens concave surface by setting the specific material, film thickness, and transmittance to, and completed the present invention.

That is, the present invention relates to a plastic lens for a lens.
The functional film is provided on the convex surface of the substrate, and the convex surface increases the reflection.
Having a concave surface having an anti-reflection effect,
The functional film is formed from a first layer to a surface in order from the surface of the plastic substrate.
The sixth layer is a laminated film, and the first layer is Ta_TwoO_Five,
ZrO_Two, Y_TwoO_Three, TiO_Two, Nb_TwoO_FiveAnd Al _Two
O_ThreeAt least one metal oxide selected from
Having a thickness of 0.01 to 0.25λ (where λ is the wavelength of the irradiation light).
Long, λ = 450 to 550 nm) high refractive index layer, second layer
But SiO_TwoConsisting of 0.01 to 0.25λ
(Λ = 450-550 nm) low refractive index layer and third layer
Cr, Ta, Nb, Ti and Zr
At least one kind of metal has a transmittance (λ = 450 to 5
(50 nm) is 90-50%, and the fourth layer is Ta.
_TwoO_Five, ZrO_Two, Y_TwoO_Three, TiO_Two, Nb_TwoO_FivePassing
And Al_TwoO_ThreeAt least one metal selected from
It is made of an oxide and has a thickness of 0.01 to 0.50λ (λ = 4
50 to 550 nm), the fifth layer is made of Cr, T
at least one selected from a, Nb, Ti and Zr
Of different kinds of metals, transmittance (λ = 450 to 550n)
m) is 50 to 10% of the layer, and the sixth layer is SiO 2_TwoFrom
And the film thickness is 0.01 to 0.50λ (λ = 450 to 550).
(nm) low refractive index layer.
It is intended to provide a mirror-coated lens made of glass.

[0006] The present invention also relates to a method for manufacturing a semiconductor device, comprising the steps of:
A film in which the seventh layer and the eighth layer are laminated in this order,
But Ta_TwoO_Five, ZrO_Two, Y_TwoO_Three, TiO_Two, Nb
_TwoO _FiveAnd Al_TwoO_ThreeAt least one selected from
Metal oxides having a thickness of 0.01 to 0.50λ
(Λ is the wavelength of the irradiation light, λ = 450 to 550 nm)
The refractive index layer and the eighth layer are made of SiO_TwoConsisting of 0.0
Low refractive index layer of 5 to 1.0λ (λ = 450 to 550 nm)
Plastic mirror coating
Offer

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The functional film of the plastic mirror-coated lens of the present invention has a six-layer or eight-layer structure, but the first and second layers function as a medium-refractive index layer of a two-layer equivalent film. , The third to fifth layers function as high-refractive-index layers of a three-layer equivalent film, the sixth layer functions as a low-refractive-index layer, and the seventh and eighth layers function as layers providing enhanced reflection. I do. On the basis of the concave surface of the lens, the first to sixth layers basically function as a λ / 4-λ / 2-λ / 4 antireflection film. The seventh and eighth layers do not contribute to any increase in reflection or antireflection from the concave surface of the lens.

The first and second layers constitute a two-layer equivalent film.
, The refractive index is about 1.75 to 1.85.
Forming a refractive index layer to obtain a reflectance equivalent to a film thickness of λ / 4.
You. The first layer is Ta_TwoO_Five, ZrO_Two, Y_TwoO_Three, Ti
O_Two, Nb_TwoO_FiveAnd Al _TwoO_ThreeFew selected from
At least one kind of metal oxide, Ta_TwoO_FiveIs
Is preferred. The thickness is 0.01 to 0.25λ (where λ is
(Λ = 450 to 550 nm in the wavelength of irradiation light, the same applies hereinafter)
And preferably 0.05 to 0.1λ. Film thickness
If it is less than 0.01λ, the film thickness is too thin and uniform film quality cannot be obtained.
If it exceeds 0.25λ, the desired refractive index cannot be obtained.
No. The second layer is made of SiO_TwoConsisting of 0.01 to
0.25λ, preferably 0.03-0.15λ
New If the film thickness is less than 0.01λ, the film thickness is too thin and uniform
Film quality cannot be obtained, and film thickness control is difficult.
If it exceeds, it does not function as a composite layer.

The third, fourth and fifth layers form a three-layer equivalent film to form a high refractive index layer having a refractive index of about 1.90 to 2.20 and a thickness of λ / 2. It is manufactured by taking into account the lens color tone utilizing the light absorption characteristics of metal and the transmittance of the lens. The third layer and the fifth layer are made of a metal film because the lens is provided with a color tone by utilizing the absorption of light of a specific wavelength and the refractive index of the metal, which are the characteristics of the metal, and at the same time, the high refractive index layer is used. Is formed.

The third layer is composed of Cr, Ta, Nb, Ti and Z
r is a metal film layer made of at least one metal selected from the group consisting of r and 90 to 50%, preferably 80 to 60%. If the transmittance is less than 50%, the effect as an anti-reflection film is reduced. If it exceeds 90%, the reflectance on the concave side is increased. easily influenced. The third layer can be formed by an evaporation method or a sputtering method.
When using Ti, a vapor deposition method is suitable, and Zr, T
When a and Nb are used, a sputtering method is suitable.

The fourth layer is made of Ta_TwoO_Five, ZrO_Two, Y_TwoO
_Three, TiO_Two, Nb_TwoO_FiveAnd Al _TwoO_ThreeChoose from
Ta at least one kind of metal oxide_TwoO
_FiveIs preferable. The thickness is 0.01 to 0.50.
λ, and preferably 0.20 to 0.30λ. film
If the thickness is less than 0.01λ, the film thickness is too thin and uniform film quality is obtained.
If it cannot be obtained and exceeds 0.50λ, it will
The effect decreases.

The fifth layer is composed of Cr, Ta, Nb, Ti and Z
r is a layer of a metal film made of at least one metal selected from the group consisting of r and has a transmittance of 50 to 10%, preferably 40 to 20%. When the transmittance is less than 10%, the reflectivity on the concave side increases, and when it exceeds 50%, the reflectivity on the concave side increases. Easy to receive. The fifth layer can be formed by a vapor deposition method or a sputtering method similarly to the third layer, and the metal is C
When using r and Ti, a vapor deposition method is suitable, and Zr,
When Ta or Nb is used, a sputtering method is suitable.

The sixth layer is made of SiO ₂ in order to form a low refractive index layer having a refractive index of about 1.44 to 1.47, and has a film thickness of about 0.40.
01 to 0.50λ, and preferably 0.22 to 0.27λ. If the film thickness is less than 0.01λ, the film thickness is too thin to obtain a uniform film quality, and if it exceeds 0.50λ, the effect as an antireflection film is reduced.

The seventh and eighth layers affect the reflection of the concave surface
, But gives further enhanced reflection to the convex surface. these
By changing the reflection of blue, silver, gold
Gives colors, greens, etc., and makes the wearer's eyes invisible
You. The seventh layer is Ta_TwoO_Five, ZrO_Two, Y_TwoO_Three, Ti
O_Two, Nb_TwoO_FiveAnd Al _TwoO_ThreeFew selected from
At least one kind of metal oxide, Ta_TwoO_FiveIs
Is preferred. The thickness is 0.01 to 0.50λ (where λ is
(Λ = 450 to 550 nm in the wavelength of irradiation light, the same applies hereinafter)
And preferably 0.02 to 0.30λ. Film thickness
Is less than 0.01λ, the film thickness is too thin to obtain uniform film quality.
If it exceeds 0.50λ, the color of the reflected light of the convex mirror
Degree decreases. The eighth layer is made of SiO_TwoConsisting of
0.05 to 1.0λ, and 0.1 to 0.80λ
Is preferred. If the film thickness is less than 0.05λ, the desired mirror
-No reflected light, poor wear resistance, exceeding 1.0λ
In this case, the desired mirror reflected light cannot be obtained, and the heat resistance decreases.
I do. As a method for forming the functional film in the present invention, vacuum
An evaporation method, a sputtering method, or the like is used.

The plastic substrate used in the present invention is not particularly limited. For example, methyl methacrylate homopolymer,
Copolymers of methyl methacrylate with one or more other monomers, homopolymers of diethylene glycol bisallyl carbonate, and copolymers of diethylene glycol bisallyl carbonate with one or more other monomers Examples include polymers, sulfur-containing copolymers, halogen copolymers, polycarbonates, polystyrene, polyvinyl chloride, unsaturated polyester, polyethylene terephthalate, polyurethane, and polythiourethane.

In the present invention, an organic hard coat layer for improving the scratch resistance of the plastic lens may be provided between the plastic substrate and the functional film. Examples of the material of the organic hard coat layer include an organic silicon compound, an acrylic compound, an epoxy compound, and the like, and may contain a particulate inorganic oxide such as silicon oxide, titanium oxide, and tin oxide. Further, in order to improve physical properties such as adhesion between the functional film and the organic hard coat layer, an organic hard coat layer is formed on the organic hard coat layer.
Known plasma processing, ion gun processing, and electronic processing may be performed. In the case of ion gun treatment, oxygen gas or argon is used, and the ion acceleration voltage is 200 to 500 V.
Is preferred.

In the present invention, a primer layer for improving impact resistance and adhesion may be provided between the plastic substrate and the hard coat layer. As the material of the primer layer, specific sulfur compounds having a dithiane ring skeleton described in JP-A-2000-2801 and / or
Or a composition comprising a specific sulfur compound having a benzene ring and a polyfunctional thiol, a compound represented by the general formula (I) R-O-CO-[-O- described in JP-A-11-228802.
R ¹ -O-CO-] n -OR (I) wherein R
Represents an unsaturated group, R ¹ represents a divalent aliphatic or aromatic group, and n represents a number of 1 to 9], (B) a general formula (II) R ² — (−SH) m ・ ・ ・ (I
I) wherein R ² represents a polyvalent organic group and m represents an integer of 2 or more; and 60 to 95% by weight of a polymerizable composition containing a polythiol and (C) a photopolymerization initiator. And a composition comprising 5 to 40% by weight of a metal compound sol having a high refractive index,
Active hydrogen selected from alkylene glycols, polyalkylene glycols, poly (alkylene adipates), poly-ε-caprolactone, polybutadiene glycols, poly (alkylene carbonate) s and silicone polyols described in JP-B-6-79084 Polyurethane resins obtained from the containing compound and polyisocyanate are exemplified.

[0018]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The evaluation of the physical properties of the plastic lenses obtained in Examples and Comparative Examples was performed as follows. (1) Luminous reflectance The luminous reflectance Y of the surface of the plastic lens was measured using Hitachi spectrophotometer U-3410 by applying black magic on the inner surface and removing reflection. The luminous reflectance Y on the back side of the plastic lens is determined by Hitachi spectrophotometer U-
First, the luminous reflectance of a lens provided with an anti-reflection film on the concave side was measured using a 3410, and the same luminous reflectance was provided. The convex surface was coated with black magic, and the reflection was removed. (Including the back side luminous reflectance), subtract the luminous reflectance measured earlier from the concave luminous reflectance of the comparative product,
The back surface side luminous reflectance Y was set. (2) Adhesion 100 squares of 1 mm x 1 mm were formed on the surface of the plastic lens with a razor, a cellophane tape was stuck on the squares, the tape was peeled off at a stretch, and the number of remaining squares was evaluated. In the table, it is described by the number of remaining cells / 100. (3) Abrasion resistance 1kg steel wool on plastic lens surface
A load of f / cm ² was applied, rubbed for 20 strokes, and evaluated according to the following criteria according to the surface condition. UA: almost no scratches A: several small scratches B: many small scratches, several thick scratches C: many small scratches, many thick scratches D: almost film peeling (4) Heat resistance Plastic lens in dry oven Heat for one hour,
The crack generation temperature was measured. (5) Alkali Resistance A plastic lens was immersed in a 10% NaOH aqueous solution for 1 hour, and evaluated according to the following criteria according to the surface condition. UA: Almost no change A: There are several point-like film bale B: Point-like film bale is on the entire surface C: Point-like bale is all over, there are several planar bale D: Almost all the film bale

Examples 1 to 9 and 13 to 20 In a glass container, colloidal silica (Sno-Tex-
40, Nissan Chemical) 90 parts by weight, 81.6 parts by weight of methyltrimethoxysilane as an organosilicon compound, 176 parts by weight of γ-glycidoxypropyltrimethoxysilane, 0.5N
A solution obtained by adding 2.0 parts by weight of hydrochloric acid, 20 parts by weight of acetic acid and 90 parts by weight of water was stirred at room temperature for 8 hours, and then left at room temperature for 16 hours to obtain a hydrolysis solution. To this solution, 120 parts by weight of isopropyl alcohol, 120 parts by weight of n-butyl alcohol, 16 parts by weight of aluminum acetylacetone, 0.2 parts by weight of a silicone-based surfactant, and 0.1 part of an ultraviolet absorber
The mixture was stirred at room temperature for 8 hours and then aged at room temperature for 24 hours to obtain a coating liquid. Plastic lens substrate pre-treated with an aqueous alkaline solution (manufactured by HOYA Corporation)
Plastic lenses for spectacles (material: diethylene glycol-
Rubis allyl carbonate) and a refractive index of 1.50) are immersed in the coating solution, and after the immersion, the plastic lens pulled up at a pulling rate of 20 cm / min is heated at 120 ° C. for 2 hours to form a cured film. Formed. afterwards,
An ion gun treatment was performed using oxygen (O ₂ ) gas under the conditions of the ion acceleration voltage and irradiation time shown in Tables 1 to 5 to form a hard coat layer (A layer). Next, a functional film composed of the first to sixth layers or a functional film composed of the first to eighth layers described in Tables 1 to 5 is formed on the hard coat A layer by a vacuum evaporation method. I got a plastic lens. The obtained plastic lenses were evaluated for (1) to (5) above, and the results are shown in Tables 1 to 5. In the table, λ
Represents the wavelength of the irradiation light, λ = 500 nm, and T represents the transmittance in luminous transmittance.

Examples 10 and 11 and Examples 21 to 24 142 parts by weight of an organosilicon compound, γ-glycidoxypropylmethoxysilane, are added to a glass container and, with stirring, 1.4 parts by weight of 0.01 N hydrochloric acid. And 32 parts by weight of water were added dropwise. After completion of the dropwise addition, the mixture was stirred for 24 hours to obtain a hydrolysis solution of γ-glycidoxypropyltrimethoxysilane. In this solution, 460 parts by weight of a stannic oxide-zirconium oxide composite sol (methanol dispersion, 31.5% by weight of all metal oxides, average particle diameter of 10 to 15 millimicrons), 300 parts by weight of ethyl cellosolve, and as a lubricant 0.7 parts by weight of a silicone-based surfactant and 8 parts by weight of aluminum acetylacetonate as a curing agent were added, sufficiently stirred, and then filtered to obtain a coating liquid. Plastic lens substrate (H
Plastic lens for spectacles (trade name: OYA Corporation)
EYAS) and a refractive index of 1.60) were immersed in the coating solution, and after the immersion was completed, a lifting speed of 20 cm /
The plastic lens pulled up in minutes was heated at 120 ° C. for 2 hours to form a cured film. Then, oxygen (O ₂ ) was obtained under the conditions of ion acceleration voltage and irradiation time shown in Tables 3 and 6.
A hard coat layer (B
Layer). Next, the first layer to the first layer described in Table 3 and Table 6 were formed on the hard coat B layer by a vacuum evaporation method.
A functional film consisting of the eighth layer was formed to obtain a plastic lens. About the obtained plastic lens, the above (1)
(5) was evaluated, and the results are shown in Tables 3 and 6. In the table, λ is the wavelength of the irradiation light, λ = 500 nm,
T indicates the luminous transmittance.

Example 12 100 parts by weight of an organosilicon compound, γ-glycidoxypropyltrimethoxysilane, was added to a glass container, and 1.4 parts by weight of 0.01 N hydrochloric acid and 23 parts by weight of water were added dropwise with stirring. . After completion of the dropwise addition, the mixture was stirred for 24 hours to obtain a hydrolysis solution of γ-glycidoxypropyltrimethoxysilane. Next, as a particulate inorganic substance, a composite particulate sol mainly composed of titanium oxide, zirconium oxide and silicon oxide (methanol dispersion, total solid content 20% by weight, average particle size 5
１５15 mm, atomic ratio of nuclear fine particles Ti / Si = 1
0, weight ratio of coated part to core part 0.25) 200
Parts by weight, 100 parts by weight of ethyl cellosolve, 0.5 parts by weight of a silicone surfactant as a lubricant, and 3 parts by weight of aluminum acetylacetonate as a curing agent,
After being added to the hydrolysis solution and sufficiently stirred, filtration was performed to obtain a coating liquid. A plastic lens substrate (a plastic lens for eyeglasses (trade name: TESLA), refractive index: 1.71 manufactured by HOYA CORPORATION) pretreated with an aqueous alkali solution is immersed in the coating solution, and after the immersion, the lifting speed is increased. The plastic lens pulled up at 20 cm / min was heated at 120 ° C. for 2 hours to form a cured film. Thereafter, an ion gun treatment was performed using oxygen (O ₂ ) gas under the conditions of the ion acceleration voltage and irradiation time shown in Table 3 to form a hard coat layer (C layer). Next, a functional film composed of the first to eighth layers shown in Table 3 was formed on the hard coat C layer by a vacuum evaporation method to obtain a plastic lens. The above plastic lenses were evaluated for the above (1) to (5), and the results are shown in Table 3. In the table, λ is the wavelength of the irradiation light, and λ = 50
0 nm and T indicate the luminous transmittance.

Comparative Examples 1 to 8 On the hard coat A layer prepared in Example 1, a functional film consisting of the first to sixth layers shown in Table 7 and the first to sixth layers A functional film composed of eight layers or a functional film composed of the first to third layers shown in Table 8 was formed to obtain a plastic lens. The above plastic lenses were evaluated for (1) to (5) above, and the results are shown in Tables 7 and 8. In the table, λ is the wavelength of the irradiation light, and λ = 5.
00 nm and T indicate transmittance in luminous transmittance.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

[Table 3]

[0026]

[Table 4]

[0027]

[Table 5]

[0028]

[Table 6]

[0029]

[Table 7]

[0030]

[Table 8]

As shown in Tables 1 to 6, Examples 1 to 24
Plastic lens has a rear surface reflectivity of 1.3 to 2.0.
%, And heat resistance, scratch resistance, heat resistance, and alkali resistance were also good. On the other hand, as shown in Tables 7 and 8, the plastic lenses of Comparative Examples 1 to 8 had a very high back surface reflectance of 10 to 37%.

[0032]

As described above in detail, the plastic mirror-coated lens of the present invention has a high reflectance on the front surface (convex surface) and a very low reflectance on the back surface (concave surface) to prevent reflection. High effect. Further, the lens of the present invention has high heat resistance, abrasion resistance, heat resistance, and alkali resistance, so that it has sufficient performance for practical use, and has both the fashionability of the mirror effect and the optical property of suppressing backside reflection. Therefore, it is suitable for an eyeglass lens.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroki Takei 2-7-5 Nakaochiai, Shinjuku-ku, Tokyo F-term in Hoya Corporation (reference) 2H006 BE05 2K009 AA02 AA09 AA15 BB14 BB24 BB25 CC03 CC09 CC14 CC24 CC42 DD03 DD04

Claims (6)

[Claims] 1. A lens having a functional film provided on a convex surface of a plastic substrate for a lens, wherein the convex surface has a reflection increasing effect, and the concave surface has an antireflection effect, and the functional films are sequentially arranged from the surface of the plastic substrate. A film in which first to sixth layers are stacked, and the first layer is made of Ta ₂ O ₅ , ZrO ₂ , Y
₂ O ₃ , TiO ₂ , Nb ₂ O _5, and at least one metal oxide selected from Al ₂ O ₃ , having a thickness of 0.01 to 0.25λ (where λ is the wavelength of irradiation light, λ = 4
(50-550 nm) high refractive index layer, the second layer is SiO ₂
And a film thickness of 0.01 to 0.25λ (λ = 450 to
550 nm), the third layer is composed of Cr, Ta, N
b, made of at least one metal selected from Ti and Zr, and having a transmittance (λ = 450 to 550 nm) of 9
The layer of 0 to 50% and the fourth layer are made of Ta ₂ O ₅ , ZrO ₂ , Y
_It is made of at least one kind of metal oxide selected from ₂ O ₃ , TiO ₂ , Nb ₂ O ₅ and Al ₂ O ₃ , and has a high film thickness of 0.01 to 0.50 λ (λ = 450 to 550 nm). The refractive index layer and the fifth layer are made of Cr, Ta, Nb, Ti and Z.
at least one metal selected from the group consisting of
The layer having a transmittance (λ = 450 to 550 nm) of 50 to 10%, the sixth layer is made of SiO ₂ , and has a thickness of 0.01 to
A plastic mirror-coated lens characterized by being a low refractive index layer having a 0.50λ (λ = 450 to 550 nm). 2. The plastic mirror-coated lens according to claim 1, wherein the functional film is formed on a sixth layer.
Further, a seventh layer and an eighth layer are films laminated in this order, and the seventh layer is composed of Ta ₂ O ₅ , ZrO ₂ , Y ₂ O ₃ , and Ti.
O ₂ , Nb ₂ O ₅ and Al ₂ O ₃ are made of at least one kind of metal oxide selected from the group consisting of
0.50λ (λ is the wavelength of irradiation light, λ = 450 to 550
high refractive index layer of nm), a plastic mirror layer 8 is made of SiO _2, the thickness is characterized by a low refractive index layer of 0.05~1.0λ (λ = 450~550nm) Coated lens. 3. The method according to claim 1, wherein the metal oxide of the first and fourth layers is Ta ₂
Plastic Mirror Coat lens according to claim 1, characterized in that the O _5. 4. The plastic mirror-coated lens according to claim 2, wherein the metal oxide of the first, fourth and seventh layers is Ta ₂ O ₅ . 5. A core between the plastic substrate and the functional film for improving abrasion resistance of a plastic lens.
The plastic mirror-coated lens according to any one of claims 1 to 4, further comprising a coating layer. 6. The plastic substrate and the hard disk.
6. A plastic mirror-coated lens according to claim 5, wherein a primer layer for improving impact resistance and adhesion is provided between the mirror layer and the plastic layer.