JP3961610B2 - Shield plate for helmet and helmet incorporating this shield plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield plate that is attached to the head-mounted body for a windshield or the like in a helmet equipped with a head-mounted body that is mounted on the head by a motorcycle rider or the like to protect the head. It also relates to helmets incorporating this shield plate.
[0002]
[Prior art]
As is well known in the art, a full-face helmet is a full-face-type head-mounted body that is worn on the head of a motorcycle such as a rider, and between a forehead and a jaw (such as a face). And a shield plate that can open and close a window hole formed on the front surface of the head-mounted body. And this shield board is rotatably attached to the head mounting body by a pair of left and right attachment shafts.
[0003]
Conventionally, such a shield plate is obtained by cutting a plate-like body made of polycarbonate resin or amorphous polyester resin having good water repellency into a predetermined shape and heat-molding, or by injection molding from these resin materials. It is made by doing. Therefore, even when the motorcycle rider travels in the rain, raindrops that fall on the outer surface of the shield plate are repelled well on the outer surface, so that the raindrop flow adheres to the outer surface. Therefore, the visibility of the rider through the shield plate is not particularly deteriorated. Further, when a hardened surface film made of silicone or acrylic resin is formed on the outer surface of the shield plate made of polycarbonate resin or amorphous polyester resin, it is possible to impart even better water repellency to the shield plate.
[0004]
[Problems to be solved by the invention]
However, the present inventor is able to form a cured film as described above even if the shield plate is made of polycarbonate resin or amorphous polyester resin, which is generally considered to have good water repellency. Even with this, it has been found that the shield plate does not necessarily exhibit sufficient water repellency when the rider of a motorcycle runs in the rain for a long time. That is, when the rider of a motorcycle travels in the rain for a long time, rainwater adheres to the part where raindrops flow on the outer surface of the shield plate and refraction occurs in this part. Found that is not necessarily good.
[0005]
And this inventor confirmed this fact by experimenting to take out from the water after immersing the above-mentioned conventional shield plate for helmets in water for about 2 hours. In this case, before dipping in water, the contact angle of the water droplets on the surface of the shield plate was very large and showed good water repellency. However, after removing from the water, the surface of the shield plate is wiped clean to absorb water while the polycarbonate resin or amorphous polyester resin constituting the shield plate is immersed in water for about 2 hours. However, the water droplets adhered to this surface and the contact angle of the water droplets on the surface of the shield plate became very small. For this reason, good water repellency was not exhibited. Further, this point was not improved so much even when the surface hardened film as described above was formed on the surface of the shield plate.
[0006]
The present invention makes it possible to remedy the above-mentioned drawbacks of the conventional shield plate for helmets very effectively with a very simple structure.
[0007]
[Means for Solving the Problems]
The present invention includes a substrate made of a hard synthetic resin and a highly water-repellent film formed on at least the outer surface of the substrate, and the substrate is made of a polycarbonate resin or an amorphous polyester resin, The aqueous film is made of SiO ₂ or SiO _x (where 1 <x <2), and the surface-cured film on the substrate side and the wavelength on the high water-repellent film side are between the substrate and the highly water-repellent film. The present invention relates to a shield plate for a helmet characterized in that the highly water-repellent film functions as a wavelength-dependent reflection control film while interposing an independent reflection film . The present invention also relates to a helmet in which such a shield plate is incorporated.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment in which the present invention is applied to a full-face helmet will be described with reference to FIGS.
[0009]
As shown in FIG. 1, the full-face helmet 1 includes a full-face head-mounted body 2 that is mounted on the head of a motorcycle such as a rider, and a head-mounted body that faces the face of a rider or the like. 2 and a pair of left and right chin rest bands attached to the inside of the head mounting body 2 (in FIG. 1, the inside of the head mounting body 2). (It is not shown in the figure because it fits in the above), but it may be a well-known one). The shield plate 4 is rotatably attached to the head mounting body 2 by a pair of left and right mounting screws 5 as is well known in the art. The shield plate 4 closes the window hole 3 at the backward rotation position, and opens the window hole 3 at the forward rotation position rotated upward from the backward rotation position. In this position, the window hole 3 can be partially opened. Further, the head-mounted body 2 may be a conventionally known one and may incorporate a single type or a plurality of types of ventilator mechanisms as necessary, but the description and illustration thereof are omitted in the text. To do.
[0010]
As shown in FIG. 2, the shield plate 4 is made of a transparent or translucent hard synthetic resin made of polycarbonate resin or amorphous polyester resin , preferably with a thickness of 0.5 to 10 mm, more preferably 1 to 5 mm. The substrate 11 and a plurality of films 12 to 17 which are sequentially stacked and deposited on the substantially entire surface of the outer surface 11a of the substrate 11. The substrate 11 can be manufactured by cutting a polycarbonate resin or an amorphous polyester resin plate into a predetermined shape and thermoforming it, or by injection-molding from these resin materials. As shown in FIG. 1, it may have the same outer shape as a conventionally known shield plate.
[0011]
A plurality of films 12 to 17 which are laminated and deposited on almost the entire surface of the outer surface 11a of the substrate 11 are, in order from the outer surface 11a side of the substrate 11, a hardened surface film 12, an inner silicon dioxide (SiO2). ) Film 13, inner titanium element (Ti) film 14, intermediate SiO2 film 15, outer Ti film 16 and outer SiO2 film 17. That is, on the almost entire surface of the outer surface 11a of the substrate 11, first, a surface cured film 12 made of silicone, which is a polymer of an organosilicon compound, or a crosslinked polymer of an acrylic resin, is preferably applied by dipping or spraying. Is deposited to a thickness of 1 to 30 μm, more preferably 3 to 20 μm. Incidentally, the surface hardening layer 12, improves the surface hardness of the hard synthetic resin substrate 11 made of polycarbonate resin or amorphous polyester resin, such as the inside of the SiO2 film 13 is deposited by vapor deposition on the surface Has a function to facilitate.
[0012]
Next, an SiO ₂ film 13, a Ti film 14, an SiO ₂ film 15, a Ti film 16 and an SiO ₂ film 17 are successively deposited on the entire outer surface of the surface cured film 12. The SiO ₂ films 13, 15, and 17 can be deposited by vapor deposition, sputtering, ion plating, or the like with a thickness of preferably 400 to 2,000 mm, more preferably 600 to 1,500 mm. The Ti films 14 and 16 can be deposited by vapor deposition, sputtering, ion plating, or the like, preferably in a thickness of 50 to 300 mm, more preferably 80 to 200 mm. Further, the total thickness of the laminated film composed of the SiO ₂ films 13, 15, 17 and the Ti films 14, 16 is preferably 1,000 to 8,000 mm, and preferably 2,000 to 6,000 mm. Further preferred.
[0013]
In the shield plate 4 shown in FIG. 2, the SiO2 films 13, 15, and 17 are wavelength-dependent reflection control films that have a function of preventing or enhancing reflection of specific wavelength components in sunlight by utilizing the interference action of light. As each is configured. Therefore, when the SiO2 films 13, 15, and 17 are configured as antireflection films, the thickness d is
d≈ (2n-1) λ / (4n1)
Selected. Here, n1 is a relative refractive index of the SiO2 films 13, 15 and 17, n is a positive integer, and λ is a wavelength of a specific wavelength component in sunlight for preventing reflection. When the SiO2 films 13, 15, and 17 are configured as reflection enhancing films, the thickness d is
d≈ (2n-1) λ / (2n1)
Selected. Here, λ is the wavelength of a specific wavelength component in sunlight that enhances reflection. In particular, the outermost SiO2 film 17 imparts high water repellency to the outer surface 11a of the substrate 11 made of a hard synthetic resin such as a polycarbonate resin or an amorphous polyester resin. If the thickness of the SiO2 films 13, 15 and 17 is smaller than the above-mentioned range, the ratio of pinholes is not large, and particularly in the case of the outermost SiO2 film 17, there is a hard water repellency. It becomes difficult to obtain. Further, if the thickness of the SiO2 films 13, 15 and 17 is larger than the above-mentioned range, the SiO2 films 13, 15 and 17 are liable to be peeled off due to a difference in thermal expansion and the like, and the transparency of the shield plate 4 may be adversely affected.
[0014]
In addition, the Ti films 14 and 16 have a function of extremely effectively preventing the generation of pinholes in the SiO ₂ films 13, 15, and 17 and improving the strength of the entire laminated films 12 to 17. Further, it also has a function of further improving the water repellency of the outer surface 11 a of the substrate 11. Further, the Ti films 14 and 16 also function as a wavelength-independent reflection film that reflects all wavelength components in sunlight almost uniformly. If the thickness of the Ti films 14 and 16 is smaller than the above-described range, the ratio of pinholes increases, and the functions of the Ti films 14 and 16 as described above are not sufficiently obtained. . Furthermore, when the thickness of the Ti films 14 and 16 is larger than the above-described range, the amount of visible light absorption increases, and the light transmittance is likely to decrease. For this reason, the motorcycle through the shield plate 4 is easily reduced. There is a risk that the visibility of the lidar and the like may be reduced.
[0015]
In the shield plate 4 shown in FIG. 2 configured as described above, the SiO ₂ films 13, 15, 17 and the Ti films 14, 16 can all function as highly water-repellent films. Further, if the thickness d of each of the SiO ₂ films 13, 15, and 17 is appropriately selected, for example, the reflection of the blue component in sunlight is selectively enhanced by any one of the SiO ₂ films 13, 15, and 17, for example. At the same time, any one of the remaining SiO ₂ films 13, 15, and 17 can selectively prevent reflection of components other than the blue component in sunlight. Therefore, in this case, the shield plate 4 appears to glow blue and white. Further, in the shield plate 4 shown in FIG. 2, the outermost layer is the SiO ₂ film 17. Between the SiO ₂ film 17 and the substrate 11, there are a Ti film 16, a SiO ₂ film 15, a Ti film 14, Since the SiO ₂ film 13 and the surface hardened film 12 are interposed, high water repellency can be imparted to the outer surface of the shield plate 4. Therefore, even if the rider of the motorcycle travels in the rain for a long time, the rider's field of view through the shield plate 4 can always be kept good.
[0017]
In the above-described embodiment shown in FIG. 2 , in particular, by mixing a large number of inorganic fibers such as glass fibers having a length of preferably 1 to 10 mm, more preferably 2 to 6 mm, in the outermost inorganic oxide film 17 . The outermost layer can also be fiber reinforced. In this case, the strength of the outermost layer can be further increased, the outermost layer is more difficult to peel off, and the water repellency of the outermost layer can be further increased.
[0018]
In the above-described embodiment, the inner SiO ₂ film 13 can be made of silicon oxide made of SiOx (where 1 <x <2). In this case, since the SiOx film 13 contains less oxygen than the SiO ₂ film 13, there is no possibility that the SiOx film 13 adheres very well to the surface cured film 12 made of a crosslinked polymer of silicone, acrylic resin, or the like and peels off. .
[0019]
In the above-described embodiment, one, two, or all of the SiO ₂ films 13, 15, 17 are made of aluminum oxide (Al ₂ O ₃ ), tin oxide (SnO ₂ ), indium oxide (In ₂ O ₃ ), It can also be comprised from other inorganic oxides, such as zinc oxide (ZnO). In this case, the inorganic oxide layers 13, 15, and 17 can function as a wavelength-dependent reflection control film similar to the SiO ₂ films 13, 15, and 17.
[0020]
In the above-described embodiment, one or both of the Ti films 14 and 16 can be made of titanium dioxide (TiO ₂ ). In this case, the refractive index n of the TiO ₂ films 14 and 16 is 2.65, and the refractive index n of the SiO ₂ films 13, 15 and 17 is 1.47. The function of preventing reflection and / or enhancing reflection with respect to the light incident on the shield plate 4 can be further improved. The TiO ₂ films 14 and 16 can be formed by vapor deposition, sputtering, ion plating, etc., with a thickness of preferably 200 to 2,000 mm, more preferably 300 to 1,600 mm. Further, one or both of the Ti films 14 and 16 may be made of other metal elements such as copper (Cu), aluminum (Al), gold (Au), silver (Ag), palladium (Pd), rhodium (Rb), silicon ( It can also be composed of inorganic elements such as other non-metallic elements such as Si) and germanium (Ge). In this case, such inorganic element films 14 and 16 can function as a wavelength-independent reflection film.
[0021]
In the above-described embodiment, the lower Ti film 14 and the intermediate SiO ₂ layer 15 can be omitted as necessary.
[0022]
In the above-described embodiment, the plurality of films 12 to 17 are formed only on the outer surface of the shield plate 4. However, the films 12 to 17 can be formed on the inner surface in the same manner. It can also be formed on the entire surface including.
[0023]
Further, in the above-described embodiment, the present invention is applied to the shield plate 4 of the full-face helmet 1, but the present invention can also be applied to a shield plate of a jet type, semi-jet type or the like helmet.
[0024]
【The invention's effect】
According to the present invention, even if the rider of the motorcycle travels for a long time in rainy weather, the water repellency of the outer surface of the shield plate is not impaired, so the rider's visibility through the shield plate is always good. For this reason, it is possible to reliably prevent an accident caused by poor visibility and difficulty in traveling.
[0025]
Further, according to the present invention , since the shield plate can be selected in a desired color tone, a helmet with very high fashionability can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view of an entire helmet in one embodiment in which the present invention is applied to a full-face helmet.
FIG. 2 is an enlarged cross-sectional view of a part of a shield plate taken along line II-II in FIG.
[Explanation of symbols]
1 Full Face Helmet 4 Shield Plate 11 Hard Synthetic Resin Substrate 12 Surface Cured Film 13 SiO ₂ Film 14 Ti Film 15 SiO ₂ Film 16 Ti Film 17 SiO ₂ Film

Claims (2)

A substrate made of hard synthetic resin;
A highly water-repellent film formed on at least the outer surface of the substrate,
The substrate is made of polycarbonate resin or amorphous polyester resin,
The highly water-repellent film is made of SiO ₂ or SiO _x (for example, 1 <x <2),
Between the substrate and the highly water-repellent film, a surface-cured film on the substrate side and a wavelength-independent reflective film on the highly water-repellent film side, respectively,
A shield plate for a helmet, wherein the highly water-repellent film functions as a wavelength-dependent reflection control film . A helmet incorporating the shield plate according to claim 1 .

Images