Window glass apparatus for vehicle
A window glass apparatus for a vehicle including a first bus bar provided in or on the glass plate and including an upper portion extending in a direction along an upper edge of the glass plate; a second bus bar provided in or on the glass plate and including a lower portion extending in a direction along a lower edge of the glass plate; and an antenna disposed in a space near the upper portion and configured to transmit and receive a radio wave having a certain frequency; wherein the glass plate has a heating area extending between the upper portion and the lower portion, and a non-heating area extending above the upper portion; wherein the heating area is an area where a conductive member is disposed, the conductive member being configured to flow a direct current in an up-down direction.
1 . A window glass apparatus for a vehicle comprising:
a glass plate for a vehicle;
a first bus bar provided in or on the glass plate and including an upper portion extending in a direction along an upper edge of the glass plate;
a second bus bar provided in or on the glass plate and including a lower portion extending in a direction along a lower edge of the glass plate; and
an antenna disposed in a space near the upper portion and configured to transmit and receive a radio wave having a certain frequency;
wherein the glass plate has a heating area extending between the upper portion and the lower portion, and a non-heating area extending above the upper portion;
wherein the heating area is an area where a conductive member is disposed, the conductive member being configured to flow a direct current in an up-down direction by applying the direct voltage between the first bus bar and the second bus bar by a power supply such that the heating area is heated by heat generation of the conductive member;
wherein the antenna has a conductor spaced apart from the glass plate and opposed to the glass plate;
wherein there is a gap between the conductor and the upper portion as viewed in a horizontal direction from a vehicle interior side; and
wherein the following formula is satisfied:
(¼)×λ≤ D
wherein the antenna is configured to transmit and receive a radio wave having a wavelength λ in air, and the gap has a length D in a vertical direction.
2 . The window glass apparatus for a vehicle according to claim 1 , wherein the non-heating area has a recessed portion descending downward as viewed in a horizontal direction from the vehicle interior side; and
wherein the recessed portion is configured to overlap with a projected plane formed by projecting the conductor onto the glass plate in the horizontal direction.
3 . The window glass apparatus for a vehicle according to claim 1 , wherein an angle formed between a horizontal plane and a plane connecting a lower end of the conductor and an upper end of the upper portion is at least 5°.
4 . The window glass apparatus for a vehicle according to claim 1 , wherein the length D is at least 13 mm.
5 . The window glass apparatus for a vehicle according to claim 1 , wherein the following formula is satisfied:
W≥ 0.15×λ
wherein the antenna is configured to transmit and receive a radio wave having a wavelength λ in air, and the conductive member includes a plurality of linear conductors disposed at intervals W as viewed in the projected plane in the horizontal direction.
6 . The window glass apparatus for a vehicle according to claim 5 , wherein the intervals W are at least 8 mm.
7 . The window glass apparatus for a vehicle according to claim 5 , wherein a gap length G between the projected plane and the upper portion in a vertical direction is at least λ/4 in plan view of the glass plate.
8 . The window glass apparatus for a vehicle according to claim 1 , wherein:
the antenna has a radiating surface radiating the radio wave, and
a dielectric having a relative dielectric constant of greater than 1 is disposed between the glass plate and the radiating surface.
9 . The window glass apparatus for a vehicle according to claim 8 , wherein the dielectric includes a resin.
10 . The window glass apparatus for a vehicle according to claim 1 , wherein:
the antenna has a radiating surface radiating the radio wave, and
the radiating surface is disposed substantially parallel to the glass plate.
11 . The window glass apparatus for a vehicle according to claim 1 , wherein:
the antenna has a radiating surface radiating the radio wave, and
the radiating surface is disposed substantially parallel to a vertical direction.
12 . The window glass apparatus for a vehicle according to claim 1 , wherein
the antenna comprises a patch antenna.
13 . The window glass apparatus for a vehicle according to claim 1 , wherein the antenna is disposed in a space near the upper portion in a central portion of the glass plate in a horizontal direction.
14 . The window glass apparatus for a vehicle according to claim 1 , wherein the glass plate is disposed at an angle of at least 20° and at most 30° with respect to a horizontal plane.
15 . The window glass apparatus for a vehicle according to claim 1 , wherein the antenna is configured to transmit and receive the radio wave in at least one of a 5.8 GHz band or a 5.9 GHz band.
16 . A window glass apparatus for a vehicle comprising:
a glass plate for a vehicle;
a first bus bar provided in or on the glass plate and including an upper portion extending in a direction along an upper edge of the glass plate;
a second bus bar provided in or on the glass plate and including a lower portion extending in a direction along a lower edge of the glass plate; and
an antenna disposed in a space near the upper portion and configured to transmit and receive a radio wave having a certain frequency;
wherein the glass plate has a heating area extending between the upper portion and the lower portion, and a non-heating area extending above the upper portion;
wherein the heating area is an area where a conductive member is disposed, the conductive member being configured to flow a direct current in an up-down direction by applying the direct voltage between the first bus bar and the second bus bar by a power supply such that the heating area is heated by heat generation of the conductive member;
wherein the antenna has a conductor spaced apart from the glass plate and opposed to the glass plate;
wherein the antenna is configured to transmit and receive a vertically polarized wave; and
wherein a projected surface on which the conductor is projected horizontally onto the glass plate overlaps the heating area.
17 . The window glass apparatus for a vehicle according to claim 16 , wherein the following formula is satisfied:
W≥ 0.15×λ
wherein the antenna is configured to transmit and receive a radio wave having a wavelength λ in air, and the conductive member includes a plurality of linear conductors disposed at intervals W as viewed in the projected plane in the horizontal direction.
18 . The window glass apparatus for a vehicle according to claim 17 , wherein the intervals W are at least 8 mm.
19 . The window glass apparatus for a vehicle according to claim 17 , wherein a gap length G between the projected plane and the upper portion in a vertical direction is at least λ/4 in plan view of the glass plate.