JP2008044133A - Optical article, image pick-up device equipped therewith, electronic instrument, and timer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical article such as a lens cover in which a water-repellent antifouling layer is formed and which can watertightly be joined to a fitted part. <P>SOLUTION: A cover member 20 as the optical article is composed of a light transmitting substrate 11, an antireflection layer 12, the water-repellent antifouling layer 13, and a light transmission preventing layer 14. The antireflection layer 12 is formed on the surface 11a of the substrate 11. The water-repellent antifouling layer 13 is formed on the upper surface of the antireflection layer 12. The light transmission preventing layer 14 in which an approximately circular through hole 18 is formed in the middle is formed on a fitting surface 11b in an inside and outside relationship with the surface 11a of the substrate 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an optical article in which a water-repellent antifouling layer is formed on a light-transmitting substrate surface, and an imaging device, an electronic device, and a timing device including the optical article.

When an optical article such as a lens is used, dirt due to adhesion of dirt, fingerprints, sweat, cosmetics, etc. is easily noticeable, and it is difficult to remove the dirt. Therefore, in order to make it difficult to get dirt or to easily wipe off dirt, functional films such as water repellent and antifouling are provided as water repellent and antifouling layers on the front and back surfaces (for example, Patent Document 1 and Patent Document 2). reference).
In particular, digital still cameras and security cameras that are often used outdoors may have a problem of raindrops appearing in the captured image if raindrops or the like adhere to optical lenses. there were. In order to prevent the adhesion of raindrops, a configuration in which an optical article such as a lens cover having a water-repellent antifouling layer formed on the surface thereof is mounted in a watertight manner so as to be an outer surface is used.

JP 2006-126782 A JP 2003-238777 A

However, a bonding agent such as an adhesive used for mounting the lens cover described above is repelled by the water-repellent antifouling layer if the water-repellent antifouling layer is formed on the front and back surfaces of the lens cover. It had the problem that it was difficult to join and mount.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an optical article such as a lens cover that is formed with a water-repellent antifouling layer and can be watertightly bonded to a mounted portion. And

The optical article of the present invention has a light-transmitting substrate, a water-repellent antifouling layer formed on one surface of the substrate, and an antifogging layer on the other surface of the substrate that has a front-back relationship with the one surface. It is characterized by being.

According to the optical article of the present invention, the water-repellent antifouling layer formed on one surface of the light-transmitting substrate removes attached water and water droplets, and further the antifogging layer formed on the other surface of the substrate. This makes it possible to prevent the substrate from fogging. As a result, it is possible to prevent light transmission from being hindered by water, water droplets, or cloudiness.

Moreover, it is desirable that the water-repellent antifouling layer is formed on the entire surface of the one surface and the antifogging layer is formed on a part of the other surface.

In this way, since the anti-fogging layer is formed on a part of the other surface, it is possible to mount the optical article at a portion where the anti-fogging layer is not formed. Thereby, joining with the to-be-mounted part in which an optical article is mounted | worn is performed reliably, and it becomes possible to obtain high watertightness.

In addition, it is desirable to have a light transmission preventing layer formed on the other surface so as to surround the light transmission portion of the substrate.

In this case, since the light transmission preventing layer is formed on the mounting surface so as to surround the light transmitting portion of the substrate, the mounting portion of the optical article cannot be visually recognized from the surface, so that the appearance can be improved. .

The water-repellent antifouling layer is preferably a film containing a fluorine-containing silane compound.

  Moreover, the said fluorine-containing silane compound is good also as being represented by following General formula (1).

（但し、式中、Ｒ_fは炭素数１〜１６の直鎖状または分岐状パーフルオロアルキル基、
Ｘはヨウ素または水素、Ｙは水素または低級アルキル基、Ｚはフッ素またはトリフルオロ
メチル基、Ｒ¹は加水分解可能な基、Ｒ²は水素または不活性な一価の有機基、ａ、ｂ、ｃ
、ｄは０〜２００の整数、ｅは０または１、ｍおよびｎは０〜２の整数、ｐは１〜１０の
整数を表す。）

(In the formula, R _f is a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms,
X is iodine or hydrogen, Y is hydrogen or a lower alkyl group, Z is a fluorine or trifluoromethyl group, R ¹ is a hydrolyzable group, R ² is hydrogen or an inert monovalent organic group, a, b, c
, D is an integer of 0-200, e is 0 or 1, m and n are integers of 0-2, and p is an integer of 1-10. )

If it does in this way, manufacture of the antifouling optical article which improved water-repellent antifouling property remarkably conventionally will be attained.

  Further, an antireflection layer may be formed below the water-repellent antifouling layer.

In this way, it is possible to form a water-repellent antifouling layer having stable performance and greatly improved durability without being affected by changes in the humidity of the atmosphere due to seasonal changes, climate changes, and the like.

In addition, the imaging apparatus of the present invention is characterized in that the above-described optical article is mounted on a configured optical system.

According to the imaging apparatus of the present invention, water and water droplets attached due to high water repellency and antifouling properties are removed by the mounted optical article, so that reflection of water and water droplets is prevented and an optical system such as a lens is used. It is possible to provide an imaging device that can ensure watertightness.

In addition, an electronic device according to the present invention is characterized in that the above-described optical article is mounted on a display portion.

According to the electronic device of the present invention, water or water droplets attached due to high water repellency and antifouling properties are removed by the mounted optical article, so that the image on the display unit can be viewed without being disturbed by water or water droplets. Thus, it is possible to provide an electronic device that can secure the water tightness of the display portion.

In addition, the timing device of the present invention is characterized in that the above-described optical article is mounted on the timing display section.

According to the timing device of the present invention, water or water droplets attached due to high water repellency and antifouling properties are removed by the mounted optical article, so that the time display unit can be visually recognized without being disturbed by water or water droplets. It is possible to provide a timing device that can be used and can secure the water tightness of the timing display unit.

Hereinafter, embodiments of an optical article according to the present invention will be described with reference to the drawings. In this embodiment, a cover member that protects an optical system such as a lens, a visual recognition unit, or a timing unit will be described as an example of the optical article of the present invention. FIG. 1 is a front sectional view showing a schematic structure of the first embodiment of the cover member. FIG. 2 is a diagram showing a schematic structure of the second embodiment of the cover member.
a) is a front sectional view, and (b) is a bottom view. FIG. 3 is a front sectional view showing a schematic structure of the third embodiment of the cover member.
(First embodiment)

As shown in FIG. 1, the cover member 10 as the first embodiment is a substrate 1 having light transmittance.
1, an antireflection layer 12 and a water-repellent antifouling layer 13.

The substrate 11 is made of inorganic glass formed so as to transmit light. The substrate 11 may be a plastic that can transmit light.
Examples of the plastic include diethylene glycol bisallyl carbonate (CR-39) resin, polyurethane resin, thiourethane resin, polycarbonate resin, and acrylic resin. When plastic is employed as the substrate 11, a hard coat film may be provided to prevent scratches.

An antireflection layer 12 is formed on the surface 11 a of the substrate 11. Here, the antireflection layer 12
Details will be described. The antireflection layer 12 is composed of a single layer or multiple layers of an inorganic coating or an organic coating. As the material of the inorganic coating, SiO ₂ , SiO, ZrO ₂ , TiO ₂ , TiO, Ti ₂
O ₃ , Ti ₂ O ₅ , Al ₂ O ₃ , Ta ₂ O ₅ , CeO ₂ , MgO, Y ₂ O ₃ , SnO ₂ , MgF ₂ , W
Examples thereof include inorganic substances such as O ₃ , and these can be used alone or in combination of two or more. When the substrate 11 is a plastic substrate, SiO ₂ , Z that can be vacuum-deposited at a low temperature
_{rO 2, TiO 2, Ta 2} O 5 is preferred. In the case of a multilayer structure, the outermost layer is SiO.
₂ is preferable.

As the multilayer film of the inorganic coating, the total optical film thickness of the ZrO ₂ layer and the SiO ₂ layer from the substrate side is λ / 4.
A four-layer structure in which the optical film thickness of the ZrO ₂ layer is λ / 4 and the optical film thickness of the uppermost SiO ₂ layer is λ / 4 can be exemplified. Here, λ is a design wavelength, and usually 520 nm is used.

As a method for forming the inorganic film, for example, a vacuum deposition method, an ion plating method, a sputtering method, a CVD method, a method of depositing by a chemical reaction in a saturated solution, or the like can be employed.

The material of the organic coating is selected in consideration of the refractive index of the glass substrate or plastic substrate and the hard coat film, and is formed by a coating method with excellent mass productivity such as spin coating and dip coating in addition to the vacuum deposition method. can do.

A water-repellent antifouling layer 13 is formed on the upper surface of the antireflection layer 12. The water-repellent antifouling layer 13 is preferably formed using a fluorine-containing silane compound represented by the following general formula (1).

一般式（１）中のＲ_fは炭素数１〜１６の直鎖状または分岐状パーフルオロアルキル基
であるが、好ましくはＣＦ₃−，Ｃ₂Ｆ₅−，Ｃ₃Ｆ₇−である。Ｒ¹は加水分解可能な基であ
り、例えばハロゲン、−ＯＲ³、−ＯＣＯＲ³、−ＯＣ（Ｒ³）＝Ｃ（Ｒ⁴）₂、−ＯＮ＝Ｃ
（Ｒ³）₂、−ＯＮ＝ＣＲ⁵が好ましい。さらに好ましくは、塩素、−ＯＣＨ₃、−ＯＣ₂Ｈ₅
である。ここで、Ｒ³は脂肪族炭化水素基または芳香族炭化水素基、Ｒ⁴は水素または低級
脂肪族炭化水素基、Ｒ⁵は炭素数３〜６の二価の脂肪族炭化水素基である。Ｒ²は水素また
は不活性な一価の有機基であるが、好ましくは、炭素数１〜４の一価の炭化水素基である
。ａ、ｂ、ｃ、ｄは０〜２００の整数であるが、好ましくは１〜５０であり、ｅは０また
は１である。ｍおよびｎは０〜２の整数であるが、好ましくは０である。ｐは１以上の整
数であり、好ましくは１〜１０の整数である。また、分子量は５×１０²〜１×１０⁵であ
るが、好ましくは５×１０²〜１×１０⁴である。

R _f in the general formula (1) is a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms, preferably CF ₃ —, C ₂ F ₅ —, C ₃ F ₇ —. R ¹ is a hydrolyzable group, for example, halogen, —OR ³ , —OCOR ³ , —OC (R ³ ) ═C (R ⁴ ) ₂ , —ON═C
_{^{(R 3) 2, -ON =}} CR 5 is preferred. More preferably, chlorine, —OCH ₃ , —OC ₂ H ₅
It is. Here, R ³ is an aliphatic hydrocarbon group or an aromatic hydrocarbon group, R ⁴ is hydrogen or a lower aliphatic hydrocarbon group, and R ⁵ is a C 3-6 divalent aliphatic hydrocarbon group. R ² is hydrogen or an inert monovalent organic group, and is preferably a monovalent hydrocarbon group having 1 to 4 carbon atoms. a, b, c and d are integers of 0 to 200, preferably 1 to 50, and e is 0 or 1. m and n are integers of 0 to 2, but preferably 0. p is an integer greater than or equal to 1, Preferably it is an integer of 1-10. Moreover, although molecular weight is 5 * 10 < ² > -1 * 10 < ⁵ >, Preferably it is 5 * 10 < ² > -1 * 10 < ⁴ >.

Moreover, what is shown by following General formula (2) is mentioned as a thing of the preferable structure of the fluorine-containing silane compound shown by the said General formula (1).

上記式中、Ｙは水素または低級アルキル基、Ｒ¹は加水分解可能な基、ｑは１〜５０の
整数を、ｍは０〜２の整数、ｒは１〜１０の整数を表す。

In the above formula, Y represents hydrogen or a lower alkyl group, R ¹ represents a hydrolyzable group, q represents an integer of 1 to 50, m represents an integer of 0 to 2, and r represents an integer of 1 to 10.

In order to form the water-repellent antifouling layer 13 on the substrate 11 using the fluorine-containing silane compound, a method in which the fluorine-containing silane compound is dissolved in an organic solvent and applied to the surface of the optical article can be employed. Application methods include dipping, spin coating, spraying, flow, doctor blade, roll coating, gravure coating, curtain flow coating,
Brush coating or the like is used. Examples of the organic solvent include perfluorohexane, perfluorocyclobutane, perfluorooctane, perfluorodecane, perfluoromethylcyclohexane, perfluoro-1,3-dimethylcyclohexane, and the like.
In addition, the water-repellent antifouling layer 13 can be formed on the substrate 11 by using a vacuum evaporation method.

The concentration when diluted with an organic solvent is preferably in the range of 0.03 to 1 wt%. If the concentration is too low, it may be difficult to form a sufficiently thick antifouling layer and a sufficient antifouling effect may not be obtained. On the other hand, if the concentration is too high, the antifouling layer may become too thick. There is a risk of increasing the burden of rinsing work to eliminate post-coating unevenness.

The film thickness of the water-repellent antifouling layer 13 is not particularly limited, but is preferably 0.001 to 0.5 μm.
In addition, Preferably it is 0.001-0.03 micrometer. If the water-repellent antifouling layer 13 is too thin, the water-repellent antifouling effect is poor, and if it is too thick, the surface becomes sticky, which is not preferable. Further, when the water repellent antifouling layer 13 is provided on the surface of the antireflection layer 12, the water repellent antifouling layer 13 has a thickness of 0.03 μm.
If it is thicker, the antireflection effect is lowered, which is not preferable.

The cover member 10 is mounted by a connection performed using an adhesive 16 or the like on the mounted portion 15 where the mounting surface 11b of the substrate 11 is indicated by an imaginary line (two-dot chain line) in the drawing. This mounting surface 1
1b has the front and back relationship with the surface 11a of the substrate. The space formed inside the adhesive 16 in plan view by this connection ensures water tightness.

According to the cover member 10 of the first embodiment described above, water or water droplets attached by the water-repellent antifouling layer 13 formed on the surface 11a side of the substrate 11 is water-repellent. Can be prevented. Further, since the water-repellent antifouling layer 13 is not formed on the mounting surface 11b, the mounting surface 11b is reliably joined to the mounted portion 15 to which the cover member 10 is mounted, and high water tightness can be obtained.
(Second embodiment)

2nd embodiment of the cover member as an optical article of this invention is described along FIG. In addition,
The same components as those in the first embodiment described above are denoted by the same reference numerals in FIG.

As shown in FIG. 2, the cover member 20 as the second embodiment is a substrate 1 having optical transparency.
1, an antireflection layer 12, a water repellent and antifouling layer 13, and a light transmission preventing layer 14.

The substrate 11 is made of inorganic glass formed so as to transmit light. An antireflection layer 12 is formed on the surface 11 a of the substrate 11. A water-repellent antifouling layer 13 is formed on the upper surface of the antireflection layer 12. A light transmission preventing layer 14 having a substantially circular through hole 18 in the center is formed on the mounting surface 11b that forms a front-back relationship with the front surface 11a of the substrate 11. The light transmission preventing layer 14 is used for preventing light transmission. That is, when the substrate 11 is viewed from the front surface 11a side, the portion of the through hole 18 is visible to the front, but the portion where the light transmission preventing layer 14 is formed is blocked by the light transmission preventing layer 14 and the other side. Cannot be seen.

The light transmission preventing layer 14 is formed by applying a resin such as black ink using a mask printing method and then drying and solidifying the resin. The thickness of the light transmission preventing layer 14 may be a thickness that does not transmit light. The light transmission preventing layer 14 can also be formed by vacuum deposition or the like, for example, a metal thin film that does not transmit light, such as aluminum, nickel, and chromium.

The cover member 20 is mounted by connecting the light transmission preventing layer 14 formed on the mounting surface 11b of the substrate 11 to the mounted portion 15 indicated by an imaginary line (two-dot chain line) in the drawing using an adhesive 16 or the like. Is done. The mounting surface 11b has a front-back relationship with the front surface 11a of the substrate. The adhesive 16 is applied so as to have a circumferential shape around the outer periphery of the light transmission preventing layer 14, and the space formed inside the adhesive 16 in plan view by this connection ensures water tightness.

According to the cover member 20 of the above-described second embodiment, water or water droplets attached by the water-repellent antifouling layer 13 formed on the surface 11a side of the substrate 11 are water-repellent. Can be prevented. Further, since the water-repellent antifouling layer 13 is not formed on the mounting surface 11b, the mounting surface 11b is reliably joined to the mounted portion 15 to which the cover member 20 is mounted, and high water tightness can be obtained. In addition, since the light transmission preventing layer 14 is formed on the mounting surface 11b so as to surround the light transmitting portion of the substrate 11, variations such as the solidified shape of the adhesive 16 in the mounting portion of the cover member 20 are observed from the surface 11a side. Since it cannot be visually recognized, it is possible to improve the appearance.
(Third embodiment)

3rd Embodiment of the cover member as an optical article of this invention is described along FIG. In addition,
The same components as those in the first embodiment described above are denoted by the same reference numerals in FIG.

As shown in FIG. 3, the cover member 25 as the third embodiment is a substrate 1 having optical transparency.
1, an antireflection layer 12, a water repellent and antifouling layer 13, a light transmission preventing layer 14, and an antifogging layer 17.

The substrate 11 is made of inorganic glass formed so as to transmit light. An antireflection layer 12 is formed on the surface 11 a of the substrate 11. A water-repellent antifouling layer 13 is formed on the upper surface of the antireflection layer 12. A light transmission preventing layer 14 having a substantially circular through hole 18 in the center is formed on the mounting surface 11b that forms a front-back relationship with the front surface 11a of the substrate 11. An antifogging layer 17 is formed on the mounting surface 11 b that is inside the through hole 18. This anti-fogging layer 17 is a so-called anti-fogging layer for preventing dew condensation and fogging of the exposed portion of the mounting surface 11b caused by the ingress of moisture when the cover member 25 is mounted on a mounted portion (not shown). It is a processing layer.

According to the cover member 25 of the third embodiment described above, the anti-fogging layer 17 as the anti-fogging treatment layer is provided in the portion where the mounting surface 11b of the substrate 11 is exposed. Thereby, in addition to the effects of the first embodiment and the second embodiment described above, when the cover member 25 is mounted on the mounted portion (not shown), the exposed portion of the mounting surface 11b is exposed due to a temperature change or the like. It is possible to prevent the condensation phenomenon that occurs, so-called fogging. Therefore, the transmission of light is always properly performed and the image to be visually recognized,
Or it becomes possible to prevent generation | occurrence | production of malfunctions, such as distortion and disorder of a captured image.

In the description of the first embodiment to the third embodiment described above, the configuration in which the antireflection layer 12 is provided between the substrate 11 and the water-repellent antifouling layer 13 has been described, but the configuration in which the antireflection layer 12 is not provided is also possible. Good. Even if the water-repellent antifouling layer 13 is directly formed on the surface 11a of the substrate 11, the same effect is obtained.

Next, configuration examples of various devices using the cover members described in the first to third embodiments will be described with reference to FIGS. 4, 5, and 6.

First, the configuration of a digital still camera that captures a still image as an example of an imaging device with a cover member attached will be described with reference to FIG. 4A and 4B schematically show a digital still camera, in which FIG. 4A is a perspective view and FIG. 4B is a cross-sectional view of an optical system portion including a lens and the like.

As shown in FIG. 4, the cover member 3 is disposed on the outermost part of the optical system 31 of the digital still camera 30.
2 is provided. The optical system 31 includes a lens 38 and a lens holder 39 that holds the lens.
And a housing 36 as a mounting portion of the cover member 32 and the like. The cover member 32 is
A water-repellent antifouling layer 34 is formed on the surface exposed to the outside of the light-transmitting substrate 33, and a light transmission preventing layer 35 is formed on the mounting surface of the front surface and the back surface. Layer 35
On the surface, it is connected to the housing 36 with a bonding material such as an adhesive 37. The adhesive 37 is provided in a circumferential shape so as to surround a light transmitting portion, thereby ensuring water tightness of a space including the surface of the lens 38, the mounting surface of the cover member 32, and the like. Become.

According to the digital still camera 30 of this example, the cover member 32 is attached to the optical system 31 such as the lens 38. Water and water droplets adhering to the cover member 32 are removed due to the high water repellency and antifouling property of the water repellent and antifouling layer 34 formed on the cover member 32, so that reflection of water and water droplets can be prevented. .
Further, the cover member 32 is connected to the light transmission preventing layer 35 in which the water-repellent antifouling layer 34 is not formed.
Since it is carried out with the housing | casing 36 on the surface, it becomes firmly connected firmly and it becomes possible to obtain higher watertightness. Accordingly, it is possible to prevent condensation on the optical system 31 such as the lens 38.
Moreover, since the light transmission prevention layer 35 is formed, the user cannot visually recognize the adhesion portion of the adhesive 37. Application of the adhesive 37 is difficult to perform uniformly due to its properties, and often causes variations. Therefore, it is possible to obtain a suitable appearance by making this portion invisible.
According to this example, it is possible to provide the digital still camera 30 having the above-described effects.

In the above description, the digital still camera is used as an example of the imaging device, but the present invention is not limited to this. For example, a security camera, a video camera, a telescope, a binoculars, etc. may be used. In particular, in outdoor use equipment where rainwater is frequently attached, the attached rainwater is repelled by the water-repellent antifouling layer 34 formed on the cover member 32. Therefore, it has a remarkable effect by preventing reflection of water and water droplets.

Next, the configuration of a mobile phone as an example of an electronic device to which a cover member is attached will be described with reference to FIG. 5A and 5B schematically show a mobile phone, where FIG. 5A is a perspective view and FIG. 5B is a cross-sectional view of a display unit.

As shown in FIG. 5, the mobile phone 50 includes a cover member 5 exposed on the outer surface of the display unit 57.
1 is provided.
The cover member 51 has a water-repellent antifouling layer 53 formed on the surface exposed to the outside of the light-transmitting substrate 52, and the light transmission preventing layer 54 is formed on the mounting surface of the front surface and the back surface. ,
On the surface of the light transmission preventing layer 54, it is connected to a case body 56, which is a mounting portion, by a bonding material such as an adhesive 55.
The adhesive 55 is provided in a circumferential shape so as to surround the outer periphery of the display portion 57 (the window opening portion of the case body 56), thereby including the surface of the display portion 57, the mounting surface of the cover member 51, and the like. The water tightness of the space will be ensured.

According to the mobile phone 50 of this example, the cover member 51 is attached to the display unit 57. Due to the high water-repellent antifouling property of the water-repellent antifouling layer 53 formed on the cover member 51, the cover member 5
Since water or water droplets attached to 1 are removed, it is possible to prevent image distortion due to water or water droplets and provide suitable image visibility.
Further, the cover member 51 is connected to the light transmission preventing layer 54 in which the water-repellent antifouling layer 53 is not formed.
Since it is carried out with the case body 56 on the surface, it is securely connected firmly and higher water tightness can be obtained. Accordingly, it is possible to prevent condensation on the display unit 57 and the like.
Further, since the light transmission preventing layer 54 is formed, the user cannot visually recognize the attached portion of the adhesive 55. Since the application of the adhesive 55 is difficult to perform uniformly and often causes variations, a favorable appearance can be obtained by making this portion invisible.
According to this example, it is possible to provide the mobile phone 50 as an electronic device having the above-described effects.

In the above description, the mobile phone is used as an example of the electronic device, but the present invention is not limited to this.
For example, it may be used for a display unit such as a navigation device, a game device, or an audio device. Especially in a portable device that frequently attaches rainwater, the attached rainwater is repelled by a water-repellent antifouling layer 53 formed on the cover member 51. Therefore, it has a more remarkable effect in preventing visual distortion of images due to water or water droplets.

Next, the configuration of a wristwatch as an example of a time measuring device with a cover member attached will be described with reference to FIG. FIG. 6 schematically shows a wristwatch, where (a) is a front view and (b) is a cross-sectional view of a time display unit. As shown in FIG. 6, the wristwatch 70 is provided with a cover member 61 that is exposed on the outer surface of a time display unit 68 having hands 67 and the like. The cover member 61 has a water-repellent antifouling layer 63 formed on the surface exposed to the outside of the light-transmitting substrate 62, and the light transmission preventing layer 64 is formed on the mounting surface of the front surface and the back surface. The surface of the light transmission preventing layer 64 is connected to a case 66 that is a mounted portion with a bonding material such as an adhesive 65. The adhesive 65 is provided in a circumferential shape so as to surround the outer periphery of the time display unit 68, thereby ensuring the watertightness of the space including the surface of the time display unit 68 and the mounting surface of the cover member 61. Will be.

According to the wristwatch 70 of this example, the cover member 61 is attached to the time display unit 68. Since the water and water droplets attached to the cover member 61 are removed by the high water repellency and antifouling property of the water repellent and antifouling layer 63 formed on the cover member 61, image distortion due to water and water droplets is prevented. The visibility of a suitable time display can be obtained.
Further, since the cover member 61 is connected to the case 66 on the surface of the light transmission preventing layer 64 where the water repellent and antifouling layer 63 is not formed, the cover member 61 is securely and securely connected, so that higher water tightness can be obtained. It becomes. Therefore, it is possible to prevent dew condensation on the time display unit 68 and the mounting surface of the substrate 62.
In addition, since the light transmission preventing layer 64 is formed, the user cannot visually recognize the attached portion of the adhesive 65. Since the application of the adhesive 65 is difficult to perform uniformly and often causes variations, a favorable appearance can be obtained by making this portion invisible.
According to this example, it is possible to provide a wristwatch 70 as a timing device having the above-described effects.

In the above description, the wristwatch 70 is used as an example of the timing device, but the present invention is not limited to this. For example, a diver watch that is used in seawater and has a high frequency of seawater adherence, or a stopwatch that has a lot of water or raindrops attached to it when used outdoors can prevent distortion of the time display due to water or waterdrops. It becomes possible to provide the visibility of a suitable time display.

The front sectional view showing the schematic structure of the first embodiment of the cover member of the present invention. It is a figure which shows schematic structure of 2nd embodiment of the cover member of this invention, (a) is front sectional drawing, (b) is a bottom view. The front sectional view showing the schematic structure of the third embodiment of the cover member of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS The structure of the digital still camera as an example of the imaging device with which the cover member of this invention was mounted | worn is shown typically, (a) is a perspective view, (b) is sectional drawing of the optical system part containing a lens. The structure of the mobile telephone as an example of the electronic device with which the cover member of this invention was mounted | worn is shown typically, (a) is a perspective view, (b) is sectional drawing of a display part. The structure of the wristwatch as an example of the timing device with which the cover member of this invention was mounted | worn is shown typically, (a) is a front view, (b) is sectional drawing of a time display part.

Explanation of symbols

10, 20, 25, 32, 51, 61 ... Cover members as optical articles, 11, 33, 5
2, 62 ... substrate, 11a ... surface, 11b ... mounting surface, 12 ... antireflection layer, 13, 34, 53
, 63 ... water-repellent antifouling layer, 14, 35, 54, 64 ... light transmission preventing layer, 15 ... attached portion, 16,
37, 55, 65 ... adhesive, 17 ... anti-fogging layer, 18 ... through-hole, 30 ... digital still camera as an imaging device, 31 ... optical system, 36 ... casing as attached portion, 38 ... lens, 39
... Lens holder, 50 ... Mobile phone as electronic device, 56 ... Case body as attached part,
57: Display unit, 66: Case as attached portion, 67: Needle, 70: Wristwatch as timing device.

Claims (9)

A substrate having optical transparency;
A water-repellent antifouling layer formed on one surface of the substrate;
An optical article comprising an anti-fogging layer on the other surface of the substrate that forms a front-back relationship with the one surface. The optical article according to claim 1.
An optical article, wherein the water-repellent antifouling layer is formed on the entire surface of the one surface, and the antifogging layer is formed on a part of the other surface. The optical article according to claim 1.
An optical article comprising a light transmission preventing layer formed on the other surface so as to surround a light transmission portion of the substrate. In the optical article according to any one of claims 1 to 3,
The optical article, wherein the water-repellent antifouling layer is a film containing a fluorine-containing silane compound. The optical article according to claim 4,
The said fluorine-containing silane compound is represented by following General formula (1), The optical article characterized by the above-mentioned.

(In the formula, R _f is a linear or branched perfluoroalkyl group having 1 to 16 carbon atoms,
X is iodine or hydrogen, Y is hydrogen or a lower alkyl group, Z is a fluorine or trifluoromethyl group, R ¹ is a hydrolyzable group, R ² is hydrogen or an inert monovalent organic group, a, b, c
, D is an integer of 0-200, e is 0 or 1, m and n are integers of 0-2, and p is an integer of 1-10. ) In the optical article according to any one of claims 1 to 5,
An optical article, wherein an antireflection layer is formed below the water-repellent antifouling layer. An imaging device, wherein the optical article according to any one of claims 1 to 6 is mounted on a configured optical system. An electronic device comprising the optical article according to any one of claims 1 to 6 mounted on a display portion. A timekeeping device in which the optical article according to any one of claims 1 to 6 is mounted on a timekeeping display section.

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