WINDSHIELD INCLUDING VEHICLE-MOUNTED RADAR
A windshield includes a radar that detects an object around the radar with transmitted and received radio waves in a millimeter band and a radar window on which at least a portion of the radio waves is incident. The windshield includes a windshield main body including a single glass layer or at least one glass layer on which a resin layer is laminated. Both of the windshield main body and the radar window are plate-shaped. An area of the radar window is smaller than an area of the windshield main body. A dielectric constant of the radar window is smaller than a dielectric constant of the glass layer. At least a portion of a side surface connecting an outer surface and an inner surface of the radar window is in contact with a side surface connecting an outer surface and an inner surface of the windshield main body.
1 . A windshield comprising:
a vehicle-mounted radar that detects an object around the vehicle-mounted radar with transmitted and received radio waves in a millimeter band;
a radar window on which at least a portion of the radio waves is incident; and
a windshield main body including a single glass layer or at least one glass layer on which a resin layer is laminated; wherein
both of the windshield main body and the radar window are plate-shaped;
an area of the radar window is smaller than an area of the windshield main body;
a dielectric constant of the radar window is smaller than a dielectric constant of the glass layer; and
at least a portion of a side surface connecting an outer surface and an inner surface of the radar window is in contact with a side surface connecting an outer surface and an inner surface of the windshield main body.
2 . The windshield according to claim 1 , wherein the outer surface of the radar window and the outer surface of the windshield main body define a single continuous surface.
3 . The windshield according to claim 1 , wherein
the windshield main body includes upper and lower edges extending in a lateral direction and left and right edges extending in an up-down direction and the lower edge is longer than the upper edge; and
the radar window increases in width toward the lower edge from the upper edge of the windshield main body.
4 . The windshield according to claim 2 , wherein
the windshield main body includes an upper edge and a lower edge both extending in a lateral direction and a left edge and a right edge both extending in an up-down direction and lower sides of the upper edge and the lower edge are longer than upper sides of the upper edge and the lower edge; and
the radar window increases in width toward the lower edge from the upper edge of the windshield main body.
5 . The windshield according to claim 1 , wherein
the side surface of the radar window includes a flange expanding along the outer surface or the inner surface of the windshield main body on an outer surface side or an inner surface side of the radar window; and
the flange adheres to the outer surface or the inner surface of the windshield main body.
6 . The windshield according to claim 2 , wherein
the side surface of the radar window includes a flange expanding along the outer surface or the inner surface of the windshield main body on an outer surface side or an inner surface side of the radar window; and
the flange adheres to the outer surface or the inner surface of the windshield main body.
7 . The windshield according to claim 3 , wherein
the side surface of the radar window includes a flange expanding along the outer surface or the inner surface of the windshield main body on an outer surface side or an inner surface side of the radar window; and
the flange adheres to the outer surface or the inner surface of the windshield main body.
8 . The windshield according to claim 4 , wherein
the side surface of the radar window includes a flange expanding along the outer surface or the inner surface of the windshield main body on an outer surface side or an inner surface side of the radar window; and
the flange adheres to the outer surface or the inner surface of the windshield main body.
9 . A radar system that detects an object around the radar system with transmitted and received radio waves in a millimeter band, the radar system comprising:
a vehicle-mounted radar; and
a windshield disposed on a side where the radio waves are radiated by the radar; wherein
the windshield includes a windshield main body including a single glass layer or at least one glass layer on which a resin layer is laminated;
the windshield includes a radar window on which at least a portion of the radio waves is incident;
both of the windshield main body and the radar window are plate-shaped;
an area of the radar window is smaller than an area of the windshield main body;
a dielectric constant of the radar window is smaller than a dielectric constant of the glass layer; and
at least a portion of a side surface connecting an outer surface and an inner surface of the radar window is in contact with a side surface connecting an outer surface and an inner surface of the windshield main body.
10 . The radar system according to claim 9 , wherein
the vehicle-mounted radar includes an antenna that transmits and receives the radio waves; and
at least a portion of the radar window is connected to the antenna.
11 . The radar system according to claim 10 , wherein a lower edge of an aperture of the antenna is located farther on a lower side than the inner surface of the windshield main body.
12 . The radar system according to claim 10 , wherein an aperture surface of the antenna expands along the inner surface of the windshield main body.
13 . The radar system according to claim 9 , wherein a vertically polarized wave component is smaller than a horizontally polarized wave component in the radio waves.
14 . The radar system according to claim 10 , wherein a vertically polarized wave component is smaller than a horizontally polarized wave component in the radio waves.
15 . The radar system according to claim 11 , wherein a vertically polarized wave component is smaller than a horizontally polarized wave component in the radio waves.
16 . The radar system according to claim 12 , wherein a vertically polarized wave component is smaller than a horizontally polarized wave component in the radio waves.
17 . The radar system according to claim 9 , wherein the side surface of the radar window includes a flange expanding along the outer surface or the inner surface of the windshield main body on an outer surface side or an inner surface side of the radar window; and
the flange adheres to the outer surface or the inner surface of the windshield main body.
18 . A vehicle mounted with the radar system according to claim 9 , wherein
the vehicle includes a rear view mirror in a vehicle interior; and
the vehicle-mounted radar is disposed between the radar window and the rear view mirror.
19 . The vehicle according to claim 9 , wherein an angle defined by the windshield and a traveling direction of the radio waves is less than 40°.