JP2016121282A - Water repellent mechanism, and display device and signal having the water repellent mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water repellent mechanism capable of maintaining water repellency for a long period of time, and a display device and a signal having the water repellent mechanism.SOLUTION: A water repellent mechanism 10 includes: an optical member 5 configured to transmit or reflect light; and a patterned film 1 having a plurality of fine projections formed with intervals on one side. The patterned film 1 is adhered on a surface of the optical member 5, with the one side facing opposite to the optical member 5. A display device and a signal having a water repellent mechanism 10 are also provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water repellent mechanism, and a display device and a traffic light equipped with the water repellent mechanism.

  When a display device such as a traffic light is used in a snowy area, there is a problem that the visibility of the display surface is lowered due to water droplets, snow, frost and ice adhering to the display surface. In order to solve this problem, it has been proposed to apply a water-repellent paint mainly composed of fluororesin fine particles and fluorine-based varnish to the surface of the display device or the surface of the hood provided on the display device ( For example, Patent Document 1).

  On the other hand, there is also a problem that visibility is lowered when an optical member such as a windshield, a side glass, a door mirror, or a fender mirror of an automobile or an optical member such as a road mirror is subjected to rain or splash. In order to solve this problem, it has been proposed to form a surface layer containing photocatalytic oxide particles, silicone, and a water-repellent fluororesin on an optical member (for example, Patent Document 2).

JP-A-10-255195 JP-A-10-237431

  However, the methods disclosed in Patent Document 1 and Patent Document 2 only apply a water-repellent paint to the surface of the display device or the surface of the optical element. Deteriorates and water repellency decreases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a water-repellent mechanism capable of maintaining water repellency over a long period of time, and a display device and a traffic light equipped with the water-repellent mechanism. There is to do.

(1) A water-repellent mechanism for solving the above-described problem includes an optical member that transmits or reflects light, and a shaped film in which a plurality of fine convex portions are formed on one surface at intervals. The shaped film is affixed to the surface of the optical member with the one surface facing away from the optical member.

  The water-repellent mechanism having this configuration is provided with a shaping film on which the structurally fine protrusions are formed on the surface of the optical member. However, the shaped film does not deteriorate extremely. Therefore, the water repellent function can be maintained over a long period.

(2) A display device for solving the above-described problem is a display device having the above-described water-repellent mechanism, and includes a housing that partitions the inside and the outside, and a light emitter provided inside the housing. A display surface that transmits the light of the light emitter to the outside of the housing, and the optical member is the display surface.

  Since the display device having this configuration applies the above water-repellent mechanism to the display surface, the water-repellent function of the display surface can be maintained for a long period of time. Therefore, it is possible to ensure the visibility of the display device over a long period of time.

(3) A traffic light for solving the above-described problems is characterized in that the display device includes the light emitter that emits light of one color or two colors.

  Since the traffic signal having this configuration applies the above water-repellent mechanism to the display surface, the water-repellent function of the display surface of the traffic signal can be maintained for a long period of time. Therefore, it is possible to ensure the visibility in the traffic light for a long period.

  According to the water repellent mechanism according to the present invention, and the display device and traffic signal device including the water repellent mechanism, the water repellency can be maintained over a long period of time.

It is sectional drawing of a part of water-repellent mechanism. It is an expanded sectional view of a part of a shaped film. It is an expanded sectional view of a part of a shaping film provided with a fluororesin layer. It is a perspective view of the traffic signal as a display apparatus provided with the water repellent mechanism using a shaping film. It is a side view of one light-emitting device which comprises the traffic signal as a display apparatus. It is the fragmentary sectional view of the traffic light which looked at the light-emitting device from the side in the position of the light-emitting device. It is the structure figure which showed the internal structure of the display apparatus typically. It is a front view of the vehicle provided with articles | goods other than the display apparatus to which a water repellent mechanism is applied.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited only to the following description and drawings. The optical member described below means a member that transmits light such as glass or a member that reflects light such as a mirror. In addition, the display device, for example, causes a light emitter to emit light such as a traffic signal installed on a road or a railway, an electric bulletin board installed on a road, a road sign, a signboard installed on a storefront, etc. Means a device intended for The traffic light is one of display devices.

[1] Water Repellent Mechanism First, the basic configuration of the water repellent mechanism 10 will be described with reference to FIG. FIG. 1 is a cross-sectional view of a part of the water repellent mechanism 10.

  As shown in FIG. 1, the water repellent mechanism 10 includes an optical member 5 that transmits or reflects light and a shaping film 1. The optical member 5 is, for example, a member that transmits light such as glass or a lens, or a member that reflects light such as a mirror. The shaped film 1 is a film in which a plurality of fine convex portions 2 are formed on one side thereof with a space P therebetween, and is attached to the surface of an optical member 5 such as glass or a mirror. At that time, one surface provided with the plurality of convex portions 2 is directed to the opposite side to the optical member 5 such as glass or mirror, and the other surface opposite to the one surface is attached to the optical member 5. ing.

[2] Shaped Film Next, details of the shaped film 1 will be described with reference to FIG. FIG. 2 is an enlarged cross-sectional view of a part of the shaped film 1.

  The shaped film 1 has a plurality of fine protrusions 2 on one surface thereof. The plurality of convex portions 2 are arranged in parallel. On the other hand, the other surface that is the surface opposite to one surface of the shaped film 1 is formed flat. There is a constant interval P between the convex portion 2 and the convex portion 2. A plurality of concave portions 3 are formed between the convex portions 2 and the convex portions 2. The interval P between the convex portions 2 is 100 nm or more and 600 nm or less. Moreover, the height H of the convex part 2 is 50 nm or more and 1 micrometer or less. The interval P between the protrusions 2 is preferably 150 nm or more and 300 nm or less, and the height H of the protrusions 2 is preferably 50 nm or more and 300 nm or less.

  In the shaped film 1, the water contact angle of the film itself as a raw material before the plurality of fine convex portions 2 are formed is 70 degrees or more. When the water contact angle of the film itself constituting the shaped film 1 is 70 degrees or more, it is possible to easily control the water repellency to 100 degrees or more. On the other hand, the shaped film 1 has a water contact angle of 130 degrees or more by forming a plurality of fine convex portions 2. When the water contact angle of the shaped film 1 is 130 degrees or more, it is possible to effectively prevent water droplets, snow, frost and ice from adhering to one surface.

  The plurality of convex portions 2 provided on one surface of the shaped film 1 can function as guiding means for guiding moisture, frost, and snow attached to the one surface. Specifically, stripes are formed by the convex portions 2 by extending the plurality of convex portions 2 in parallel with each other. The convex portions 2 forming the stripes serve as guiding means for guiding moisture, frost and snow adhering to one surface in the direction in which the stripes extend. The stripe can be guided to a position where snow or the like attached to one surface is to be guided by extending the stripe toward the position where snow or the like is to be guided in the water repellent mechanism 10 provided with the shaping film 1.

  The shaped film 1 having the above structure is preferably composed of a material having excellent total light transmittance. Examples of such materials include polyester, polyolefin, cellulose derivative, poly (meth) acrylic acid and its ester compound, urethane resin, polycarbonate, and ethylene vinyl acetate copolymer (EVA).

  As shown in FIG. 3, a fluororesin layer 4 can be provided on one surface of the shaped film 1. FIG. 3 is an enlarged cross-sectional view of a part of the shaped film 1 provided with the fluororesin layer 4.

  The fluorine purpose layer 4 is formed to have a thickness of 10 nm or more and 2 μm or less. The thickness of the fluorine purpose layer 4 is preferably 100 nm or more and 300 nm or less. This fluororesin layer 4 has improved water repellency.

[3] Display device provided with water repellent mechanism [3.1] Signal device Next, the signal device 20 as the display device 40 including the water repellent mechanism 10 using the above-described shaped film 1 will be described with reference to FIGS. Will be described with reference to FIG. 4 is a perspective view of the traffic signal 20 as the display device 40 provided with the water repellent mechanism 10 using the shaping film 1. FIG. 5 is one light emission constituting the traffic signal 20 as the display device 40. 3 is a side view of the device 30. FIG. FIG. 6 is a partial cross-sectional view of the traffic light 20 when the traffic light 20 as the display device 40 is viewed from the side of the light emitting device 30 at the position of the light emitting device 30.

  As shown in FIGS. 4 and 5, the traffic light 20 as the display device 40 includes a casing 21 that forms an outer shell and partitions the inside and the outside, and a light emitting device 30 that emits blue, yellow, and red light. ing. The traffic light 20 is provided with a display surface 31 for irradiating the light of each light emitting device 30 to the front for each light emitting device 30. In addition, the traffic light 20 has a hood cover 23 protruding forward from the front thereof.

  The housing 21 is divided into three portions 22, and the interior is divided into three spaces. A light emitting device 30 is provided in each of the three portions 22. However, the housing | casing 21 is not limited to the form partitioned for every part provided with the light-emitting device 30, The inside may be formed by 1 space.

  As shown in FIG. 5, the light emitting device 30 includes a light emitter (not shown), a dome-shaped display surface 31 that forms a front portion, and a case 32 for housing the light emitter inside.

  The display surface 31 is made of glass, a transparent resin material, or the like, and transmits light from the light emitter to the outside. The display surface 31 constitutes the optical member 5 of the water repellent mechanism 10 described above. The shaping film 1 is provided on the outer surface of the display surface 31.

  As described above, the shaped film 1 has a water contact angle of 70 degrees or more, preferably 130 degrees or more. Therefore, the shaping film 1 effectively prevents water droplets, snow, frost and ice from adhering to the outer surface of the display surface 31.

  In addition, by forming the guiding means formed by the convex portion 2 on one surface of the shaping film 1, water droplets, snow, frost and ice that have adhered to the outer surface of the display surface 31 are effective from the outer surface of the display surface 31. Can be removed. When the guiding means is formed on one surface of the shaped film 1, it is preferable to form a vertically extending stripe by extending the plurality of convex portions 2 in the vertical direction. By forming stripes extending vertically, the guiding means constituted by the plurality of convex portions 2 guides water droplets, snow, frost, and ice attached to the outer surface of the display surface 31 to the lower side of the display surface 31. As a result, the guiding means removes water droplets, snow, frost and ice from the outer surface of the display surface 31.

  The light emitter is configured by a light emitting diode, a halogen lamp, or the like. The halogen lamp can melt snow or the like attached to the display surface 31 by generating heat when it is issued. Therefore, there is not much snow on the display surface 31 for a long time. On the other hand, since the light emitting diode generates only a small amount of heat during light emission, it is difficult to melt snow or the like attached to the display surface 31. Therefore, by applying the water repellent mechanism 10 using a shape film to the traffic light 20 whose light emitter is a light emitting diode, it is possible to effectively prevent water droplets, snow, frost, ice and the like from adhering to the display surface 31. be able to.

  The hood cover 23 protrudes forward on the upper side of each light emitting device 30 on the front surface of the traffic light 20. The hood cover 23 is provided along the outer peripheral edge of the display surface 31 of each light emitting device 30, and the shape in plan view is an arc shape. The hood cover 23 prevents snow from directly accumulating on the display surface 31 of each light emitting device 30.

  In addition, in the traffic light 20, there is the traffic light 20 in a form in which a shielding plate 25 is provided in front of each light emitting device 30, as shown in FIG. 6 is a partial cross-sectional view of the traffic light 20 when the light emitting device 30 in the traffic light 20 as the display device 40 is viewed from the side.

  The shielding plate 25 is attached to the hood cover 23 while being inclined obliquely below the hood cover 23. Specifically, the upper part of the shielding plate 25 is located in front of the light emitting device 30 with respect to the lower part, and the outer surface is directed obliquely downward. The shielding plate 25 is made of a transparent member, transmits light from the light emitting device 30 to the outside, and prevents the display surface 31 of the light emitting device 30 from being exposed to water drops, snow, frost, ice, and the like. Yes.

  In the traffic signal 20 shown in FIG. 6, the shaping film 1 is provided on the outer surface of the shielding plate 25. That is, in this traffic light 20, the shielding plate 25 including the shaping film 1 is configured as the water repellent mechanism 10. When the shaping film 1 is provided on the outer surface of the shielding plate 25, a plurality of convex portions 2 provided on one surface of the shaping film 1 are formed so as to extend in the vertical direction, thereby forming a stripe extending in the vertical direction. By forming stripes extending vertically, the plurality of convex portions 2 function as guiding means for guiding water droplets, snow, frost and ice attached to the outer surface of the shielding plate 25 to the lower side of the shielding plate 25.

  In addition, since the fixed range of the upper side of the shielding board 25 is covered with the hood cover 23, snow hardly hits directly. Therefore, when the shaping film 1 is provided on the outer surface of the shielding plate 25, it may be provided within a certain range from the lower end of the shielding plate 25 as represented by the symbol A in FIG. 6. However, the shaping film 1 may be provided on the entire outer surface of the shielding plate 25.

  In the traffic light 20 described above, depending on the hood cover 23, it is not possible to prevent the precipitation or snowfall from hitting, and the shaping film 1 can also be provided at a site where the rain or snowfall hits directly. For example, in the front of the traffic light 20, it can be provided on a portion where it is not possible to prevent precipitation or snowfall, the upper surface of the hood cover 23, and the upper surface or side surface of the housing 21.

  In addition, when providing the shaping film 1 on the upper surface of the hood cover 23, it is good to form the stripe extended in the circumferential direction by forming the some convex part 2 extending in the circumferential direction of the circular arc-shaped hood cover 23. FIG. By forming stripes extending in the circumferential direction, the plurality of convex portions 2 function as guiding means for guiding water droplets, snow, frost and ice attached to the outer surface of the display surface 31 along the circumferential direction of the hood cover 23. To do.

  In addition, the shaping film 1 can use the shaping film 1 shown in FIG. 2, and can also use the shaping film 1 which provided the fluororesin layer 4 on the surface shown in FIG.

  The signal device 20 has been described as an example of the display device 40. However, the above-described water repellent mechanism 10 can be applied to the display device 40 other than the traffic light 20.

[3.2] Display Device Other than Traffic Light An example in which the water repellent mechanism 10 is applied to a display device 40 other than the traffic light 20 will be described with reference to FIG. FIG. 7 is a structural diagram schematically showing the internal structure of the display device 40.

  The display device 40 has an outer shell, a housing 41 that partitions the inside and the outside of the display device 40, a light emitting diode 44 provided in the housing 41, and a front surface of the display device 40. A front plate 43 serving as a display surface 42 that transmits the light of the diode 44 to the outside is provided.

  The housing 41 forms an outer shell of the display device 40 and partitions the inside and the outside of the display device 40. The interior of the housing 41 is a space. The housing 41 is configured by a polyhedron having a plurality of surfaces such as a rectangular parallelepiped, for example. At least one of the plurality of surfaces is the display surface 42. The display device 40 shown in FIG. 7 has a front surface configured as a display surface 42. The display surface 42 is constituted by a front plate 43 and transmits light emitted from the light emitting diode 44 to the outside of the housing 41.

  A plurality of light emitting diodes 44 are mounted on the substrate 45 inside the housing 41. In the example shown in FIG. 7, the light-emitting diode 44 is mounted on the substrate 45 so as to face the front plate 43 constituting the display surface 42. Each light emitting diode 44 is connected in series or in parallel depending on the application of the display device 40 or the like.

  The display surface 42 is configured by a front plate 43. The front plate 43 is formed of a transparent member, such as glass or resin, and transmits light from the light emitting diode 44 to the outside. The shaping film 1 is provided on the outer surface of the front plate 43. That is, the front plate 43 constitutes the optical member 5 of the water repellent mechanism 10, and the front plate 43 provided with the shaping film 1 constitutes the water repellent mechanism 10.

  According to the display device 40 configured as described above, it is possible to prevent water droplets, snow, frost and ice from adhering to the front plate 43. That is, the shaping film 1 provided on the outer surface of the front plate 43 has a water contact angle of 70 degrees or more, preferably 130 degrees or more, as described above. Therefore, the shaping film 1 can effectively prevent water droplets, snow, frost and ice from adhering to the outer surface of the front plate 43.

  The display device 40 can also function as guiding means for guiding water droplets, snow, frost, and ice attached to the outer surface of the front plate 43 to be removed from the front plate 43. For example, when the shaping film 1 is provided on the outer surface of the front plate 43, a plurality of convex portions 2 provided on one surface of the shaping film 1 are formed so as to extend in the vertical direction, thereby forming a vertically extending stripe. . By forming stripes extending vertically, the plurality of convex portions 2 function as guiding means for guiding water droplets, snow, frost, and ice attached to the outer surface of the front plate 43 to the lower side of the front plate 43.

  In addition, the shaping film 1 can use the shaping film 1 shown in FIG. 2, and can also use the shaping film 1 which provided the fluororesin layer 4 on the surface shown in FIG.

[4] Articles other than the display device to which the water-repellent mechanism is applied The water-repellent mechanism 10 can be applied to devices other than the display device. Articles other than the display device to which the water repellent mechanism 10 is applied will be described with reference to FIG. FIG. 8 is a front view of the vehicle 50 provided with an article other than the display device to which the water repellent mechanism 10 is applied.

  The water repellent mechanism 10 can also be applied to the side mirror 51, the windshield 52, the headlight 53, etc. of the vehicle 50 shown in FIG.

  In the side mirror 51, the mirror itself constitutes the optical member 5 of the water repellent mechanism 10, and the mirror provided with the shaping film 1 constitutes the water repellent mechanism 10. The side mirror 51 protrudes sideways from the door of the vehicle 50, and it is easy for snow to accumulate on the upper part of the side mirror 51. Further, the side mirror 51 is liable to have water droplets, snow, frost, ice and the like attached to the surface of the mirror itself. By providing the above-described shaping film 1 on the surface of the mirror itself of the side mirror 51, it is possible to effectively prevent water droplets, snow, frost, ice and the like from adhering to the surface of the mirror itself. is there.

  In addition, when providing the shaping film 1 on the surface of a mirror, the stripe extended in the up-down direction is formed by extending the several convex part 2 provided in one surface of the shaping film 1 to the up-down direction. By forming stripes extending vertically, the plurality of convex portions 2 function as guiding means for guiding water droplets, snow, frost and ice attached to the surface of the mirror to the lower side of the mirror.

  In the windshield 52, the windshield 52 itself constitutes the optical member 5 of the water repellent mechanism 10, and the windshield 52 provided with the shaping film 1 constitutes the water repellent mechanism 10. The lower part of the windshield 52 is positioned in front of the upper part, and the outer surface is inclined obliquely upward. Therefore, it has a structure that makes it easy to accumulate snow. Moreover, rainwater, frost, and ice are likely to adhere to the windshield 52. By providing the above-described shaping film 1 on the outer surface of the windshield 52, it is possible to effectively prevent water droplets, snow, frost, ice and the like from adhering to the outer surface of the windshield 52. is there.

  When the shaping film 1 is provided on the outer surface of the windshield 52, a plurality of convex portions 2 provided on one surface of the shaping film 1 are formed to extend in the vertical direction, thereby forming a stripe extending in the vertical direction. By forming stripes extending vertically, the plurality of convex portions 2 function as guiding means for guiding water droplets, snow, frost and ice attached to the outer surface of the windshield 52 to the lower side of the windshield 52.

  In addition, when providing the shaping film 1 in the outer surface of the windshield 52, the direction where a stripe extends can also be divided with the area | region of the windshield 52. FIG. For example, in the central region in the left-right direction of the windshield 52, a stripe extending vertically is formed as described above. On the other hand, in the regions on both sides of the windshield 52, the direction in which the stripe extends may be inclined obliquely to induce snow or the like below the side portion of the windshield 52.

  In the headlight 53, the resin cover of the headlight 53 constitutes the optical member 5 of the water repellent mechanism 10, and the resin cover provided with the shaping film 1 constitutes the water repellent mechanism 10. By providing the above-described shaping film 1 on the outer surface of the resin cover of the headlight 53, it is possible to effectively prevent water droplets, snow, frost, ice and the like from adhering to the outer surface of the resin cover. It is.

  In addition, the shaping film 1 can use the shaping film 1 shown in FIG. 2, and can also use the shaping film 1 which provided the fluororesin layer 4 on the surface shown in FIG.

  The case where the water repellent mechanism 10 is applied to the side mirror 51, the windshield 52, and the headlight 53 has been described above, but the present invention can also be applied to other articles such as a rear glass and a tail lamp.

  The case where the water repellent mechanism 10 is configured by the optical member 5 has been described above as an example. However, the water repellent mechanism 10 can also be configured by providing the shaping film 1 on a member different from the optical member 5. For example, the shaping film 1 can be provided on the upper surface of the roof tile, and the roof tile can be configured as the water repellent mechanism 10.

  In that case, the shaping film 1 can function as a guiding means for guiding the snow or the like accumulated on the upper surface of the roof tile to be removed from the roof tile. For example, when the roof tile is installed on the roof, the shaping film 1 is provided so that the stripe extends downward, thereby functioning as guiding means for guiding snow accumulated on the roof tile downward.

DESCRIPTION OF SYMBOLS 1 Shaped film 2 Convex part 3 Concave part 4 Fluororesin layer 5 Optical member 10 Water repellent mechanism 20 Traffic light 21 Case 23 Hood cover 25 Shielding board 30 Light-emitting device 31 Display surface 32 Case 40 Display device 41 Case 42 Display surface 43 Front plate 44 Light emitting diode 45 Substrate 50 Vehicle 51 Side mirror 52 Windshield 53 Headlight

Claims (9)

An optical member that transmits or reflects light;
A plurality of fine projections formed on one surface with a gap, and a shaped film,
The water-repellent mechanism, wherein the shaped film is attached to the surface of the optical member with the one surface facing away from the optical member.   The water repellent mechanism according to claim 1, wherein a water contact angle of the shaped film before forming the plurality of fine convex portions is 70 degrees or more.   The water repellent mechanism according to claim 2, wherein a water contact angle of the shaped film on which the plurality of fine convex portions are formed is 130 degrees or more.   The water repellent mechanism according to any one of claims 1 to 3, wherein the plurality of fine convex portions form a stripe.   5. The water repellent mechanism according to claim 4, wherein the plurality of fine convex portions form a guide passage that guides moisture, frost, and snow adhering to the one surface in a direction in which the stripe extends.   The water repellent mechanism according to claim 1, wherein a fluororesin layer is formed on the surface of the one surface. A display device comprising the water repellent mechanism according to claim 1,
A housing that divides the inside and the outside;
A light emitter provided inside the housing;
A display surface that transmits the light of the light emitter to the outside of the housing,
A display device, wherein the optical member is a display plate constituting the display surface. A hood cover that protrudes outward from the display surface above the display surface,
The display device according to claim 7, wherein the shaping film is provided on a portion of the outer surface of the display device that is directly exposed to precipitation or snowfall.   The signal device as the display device according to claim 7 or 8, wherein the display device is a signal device including the light emitter that emits light of one color or two colors or more.

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