EP2299538A1 - Fensterglas für ein auto - Google Patents

Fensterglas für ein auto Download PDF

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Publication number
EP2299538A1
EP2299538A1 EP09770003A EP09770003A EP2299538A1 EP 2299538 A1 EP2299538 A1 EP 2299538A1 EP 09770003 A EP09770003 A EP 09770003A EP 09770003 A EP09770003 A EP 09770003A EP 2299538 A1 EP2299538 A1 EP 2299538A1
Authority
EP
European Patent Office
Prior art keywords
antenna
heating wire
dtv
wire pattern
pattern portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09770003A
Other languages
English (en)
French (fr)
Inventor
Hiromasa Morishita
Hitoshi Kakizawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Sheet Glass Co Ltd
Original Assignee
Nippon Sheet Glass Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Sheet Glass Co Ltd filed Critical Nippon Sheet Glass Co Ltd
Publication of EP2299538A1 publication Critical patent/EP2299538A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/1271—Supports; Mounting means for mounting on windscreens
    • H01Q1/1278—Supports; Mounting means for mounting on windscreens in association with heating wires or layers

Definitions

  • the present invention relates to a window glass for vehicles, particularly to a window glass for vehicles provided with a defogger for preventing fogging and antennas.
  • antennas When antennas are mounted on a rear window provided with a defogger, the antennas are provided in a narrow space between the defogger and a metal part of a vehicle body roof.
  • Mounted antennas include an AM antenna and an FM antenna, as disclosed in Japanese Unexamined Patent Application Publication No. 2003-500870 .
  • the AM antenna When a DTV antenna, an AM antenna and an FM antenna, specifically, a DTV antenna and an AM antenna are provided in a narrow space between a defogger and a vehicle body roof, the AM antenna is located near the DTV antenna.
  • the sensitivity of the DTV antenna is reduced.
  • the sensitivity of the DTV antenna is reduced. This is because the directionality of the elevation angle of the DTV antenna relative to the horizontally-polarized wave is changed from the horizontal to the zenith direction due to the influence of the horizontal antenna element, which is disadvantage to reception of the terrestrial wave and results in reduction in the sensitivity.
  • the AM antenna cannot be provided close to and under the DTV antenna, a footprint of the antenna element cannot be ensured and as a result, the sensitivity of the AM antenna cannot be ensured sufficiently.
  • the present invention to provide a window glass for vehicles by which a highly-sensitive DTV antenna can be obtained even if the AM antenna and the FM antenna are installed under the DTV antenna and the sensitivity of the AM antenna and the FM antenna can be ensured.
  • the heating wire pattern of the defogger has a shape having a convex heating wire pattern portion, the upper middle portion of the convex heating wire pattern portion being raised in the state where a window glass is mounted on a vehicle. Both sides of the convex heating wire pattern portion recede and a non-heat generating area is ensured between the DTV antenna and the heating wire pattern portion that recedes downwardly.
  • the AM antenna has a plurality of first elements facing the convex heating wire pattern portion and being parallel to the heating wire that forms the convex heating wire pattern portion and a second element disposed in the non-heat generating area. Thus the distance is kept between the DTV antenna and the second element of the AM antenna located under the DTV antenna, thereby reducing the influence of the AM antenna to the reception of horizontally-polarized wave by the DTV.
  • the pattern of the second element of the AM antenna disposed under the DTV antenna has a meandering shape or a comb shape, thereby further reducing the influence of the AM antenna to the reception of horizontally-polarized wave by the DTV.
  • the AM antenna requires a footprint
  • the second element of the AM antenna can be disposed in the non-heat generating area. Thus the footprint can be ensured, thereby ensuring the sensitivity of the AM antenna.
  • an element of the FM antenna disposed under the second element of the AM antenna has a pattern that is formed along the convex heating wire pattern portion.
  • a window glass for vehicles by which a highly-sensitive DTV antenna can be obtained even if an AM antenna is installed under the DTV antenna, and the sensitivity of the AM antenna can be ensured is realized. Further, since power can be fed to the AM antenna from the sides of the rear window, an AM amplifier can be mounted on a vehicle, thereby enhancing a degree of freedom in designing a vehicle.
  • FIG.1 is a diagram showing one embodiment of a window glass for vehicles according to the present invention.
  • the window glass for vehicles 10 of the present embodiment has a defogger 14 formed on the vehicle interior surface of a rear window 12.
  • the defogger 14 consists of a plurality of heating wires 18 connected laterally between bus bars 16a and 16b provided on both sides of the rear window 12.
  • the pattern of these heating wires has a convex heating wire pattern portion in which the upper middle portion rises and both sides thereof recede downwardly in the sate where the window glass for vehicles 10 is mounted on a vehicle.
  • the convex portion (convex heating wire pattern portion) 30 includes five lateral heating wires 18 and both sides of the convex heating wire pattern portion are provided with vertical heating wires 20a and 20b to which these five lateral heating wires 18 are connected. Lower portions of the vertical heating wires 20a and 20b are connected respectively to the upper end portions of the bus bars 16a and 16b through lateral heating wires 22a and 22b.
  • the heating wires 20a and 22a, and 20b and 22b that connect the convex heating wire pattern portion 30 to the bus bars carry current for the five lateral heating wires. Therefore, if they have the same wire width as that of the lateral heating wire 18, the heat generating amount will be greater than that generated by other portions. To avoid this, wire width of these heating wires should be greater than that of the lateral heating wire 18.
  • a non-heat generating area where antennas can be provided stretches out between the defogger 14 in a shape of such convex heating wire pattern and the upper hem 24 of the glass adjacent to the metal part of the vehicle body roof.
  • a wide non-heat generating area stretches out under the upper hem 24 of the glass.
  • a DTV antenna, an AM antenna and an FM antenna formed respectively by conductive lines are disposed.
  • DTV antennas are provided respectively on both sides of the upper portion of the vehicle interior surface of the rear window 12, and consist respectively of U-shaped DTV antenna elements 32a and 32b that are disposed near the upper hem 24 of the window glass. These DTV antenna elements are disposed in the upper portion of the wide non-heat generating area that stretches out on both sides of the convex heating wire pattern portion 30. Power feeding terminals 34a and 34b are connected respectively to these DTV antenna elements.
  • FM antennas are provided respectively on both sides of the defogger along the convex heating wire pattern portion 30 thereof and consist respectively of L-shape antenna elements 26a and 26b. Power feeding terminals 28a and 28b are connected respectively to these FM antenna elements.
  • the DTV antennas and the FM antennas are disposed symmetrically so that they can constitute diversity.
  • the AM antenna is disposed above the defogger 14 and the FM antenna and under the DTV antenna.
  • the AM antenna consists of a rectangular antenna element (first element) 36 that is formed by arranging a plurality of conductive lines in parallel in a lateral direction and disposed above the convex heating wire pattern portion 30 of the defogger 14, and meander-shaped antenna elements (second elements) 38a and 38b disposed respectively on both sides of the rectangular antenna element.
  • the second elements 38a and 38b meander vertically and laterally in a rectangular pattern, and each one end of the elements is connected to the first element 36, other end of the second element 38a is connected to the power feeding terminal 40 and other end of the second element 38b is open.
  • the second elements 38a and 38b of the AM antenna are disposed respectively under the DTV antenna elements 32a and 32b in the non-heat generating area formed on both sides of the convex heating wire pattern portion. In this manner, since the second elements located respectively under the DTV antenna elements 32a and 32b meander, the influence to the sensitivity of the DTV antenna is reduced.
  • the non-heat generating area that is sufficient to dispose the FM antenna elements and the AM antenna elements is ensured on both sides of the convex heating wire pattern portion 30 of the defogger 14.
  • the distances between the DTV antenna element 32a and the AM antenna second element 38a, and between 32b and 38b can be kept respectively, thereby further reducing the influence of the second element of the AM antenna to the sensitivity of the DTV antenna.
  • the meandering shape of the second element of the AM antenna is not limited to the rectangular meandering shape as shown in the diagram, and it can be a sinusoidal meandering shape. Further, the vertical meander width does not have to be constant, and may vary depending on the meandering. Moreover, the shape of the second element located under the DTV antenna element is not limited to a meandering shape, and can be, for example, a comb shape. It does not have to be a meandering shape to keep a predetermined distance between the AM antenna and the DTV antenna and, thus the influence of the AM antenna to the sensitivity of the DTV antenna can be reduced.
  • a window glass for vehicles provided with AM antenna elements 36, 38a and 38b having a meandering shape and DTV antenna elements 32a and 32b located above a normal type defogger 60 forming no convex heating wire pattern portion is prepared as a comparative example, and average sensitivity of each of the AM antenna and DTV antenna is measured with respect to the embodiment 1 and the comparative example.
  • Table 1 shows measured values of the average sensitivity of each AM antenna.
  • Table 1 Average Comparative example Embodiment 1 value (dBuV) 41.5 47.5
  • Table 2 shows the average sensitivity of each DTV antenna.
  • FIG.3 shows another embodiment of a window glass for vehicles where the second elements of the AM antennas located under DTV antenna elements have a comb shape.
  • the comb shaped second elements are indicated as 42a and 42b.
  • the second elements are shaped like a comb with teeth facing upward.
  • Other structures are the same as the embodiment shown in FIG.1 .
  • the components that are the same as those in FIG.1 are assigned with the same reference numerals.
  • both ends of the five lateral heating wires 18 in the convex heating wire pattern portion are connected respectively to the heating wires 20a and 22a, and the heating wires 20b and 22b.
  • the wire width of the lateral heating wire 18 is 1mm
  • abnormal heat generation occurs if each of the heating wires of 20a, 22a, 20b and 22b is 8mm in width.
  • the wire width is set to be 15.5mm. In this case, since the wire width is large, it lacks design aesthetics.
  • FIG.4 is a partial enlarged view of the left side of the defogger including a convex heating wire pattern portion 50.
  • the defogger is symmetric, thus only the left side portion is described.
  • the five lateral heating wires 18 constituting the convex heating wire pattern portion 50 are divided into three wires on the upper side and two wires on the lower side.
  • the three lateral heating wires on the upper side are connected to the vertical heating wire 20a of large wire width, which is connected to the lateral heating wire 22a.
  • the two lateral heating wires on the lower side are connected to the lateral heating wire 46a of large wire width.
  • the lateral heating wires 22a and 46a of large wire width are connected respectively to the bus bar 16a.
  • wire width of the lateral heating wire 18 When the wire width of the lateral heating wire 18 is 1mm, wire width of each of the heating wires 20a and 22a generating no abnormal heat is 7.7mm and wire width of the heating wire 46a generating no abnormal heat is 6.5mm. Thus, since the wire width can be reduced compared to the case where five lateral heating wires 18 are connected to one heating wire of large wire width, design aesthetics can be improved.
  • five lateral heating wires are divided into three on the upper portion and two on the lower portion, and this can be two on the upper portion and three on the lower portion. Further, when the number of lateral heating wires constituting the convex heating wire pattern portion is four, they may be divided into two on the upper portion and two on the lower portion. In addition, when the number of lateral heating wires constituting the convex heating wire pattern portion is six, they may be divided into three on the upper portion and three on the lower portion.

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  • Details Of Aerials (AREA)
EP09770003A 2008-06-26 2009-06-05 Fensterglas für ein auto Withdrawn EP2299538A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008167102A JP5213544B2 (ja) 2008-06-26 2008-06-26 自動車用窓ガラス
PCT/JP2009/060372 WO2009157293A1 (ja) 2008-06-26 2009-06-05 自動車用窓ガラス

Publications (1)

Publication Number Publication Date
EP2299538A1 true EP2299538A1 (de) 2011-03-23

Family

ID=41444362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09770003A Withdrawn EP2299538A1 (de) 2008-06-26 2009-06-05 Fensterglas für ein auto

Country Status (4)

Country Link
EP (1) EP2299538A1 (de)
JP (1) JP5213544B2 (de)
CN (1) CN102067379A (de)
WO (1) WO2009157293A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2913889A4 (de) * 2012-10-25 2016-05-11 Asahi Glass Co Ltd Fahrzeugfensterscheibe und befestigungsstruktur dafür
US10686245B2 (en) 2016-03-22 2020-06-16 AGC Inc. Back door, and glass antenna
US10985438B2 (en) 2016-07-01 2021-04-20 Nippon Sheet Glass Company, Limited Vehicle window glass

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6926721B2 (ja) * 2017-06-27 2021-08-25 Ａｇｃ株式会社 ガラスアンテナ及び車両用窓ガラス

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4200487B2 (ja) * 2003-09-24 2008-12-24 セントラル硝子株式会社 車両用後部窓ガラス
JP2006197184A (ja) * 2005-01-13 2006-07-27 Asahi Glass Co Ltd 車両用ガラスアンテナ
JP2008067300A (ja) * 2006-09-11 2008-03-21 Nippon Sheet Glass Co Ltd 車両用後部窓ガラス

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009157293A1 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2913889A4 (de) * 2012-10-25 2016-05-11 Asahi Glass Co Ltd Fahrzeugfensterscheibe und befestigungsstruktur dafür
US9986601B2 (en) 2012-10-25 2018-05-29 Asahi Glass Company, Limited Window glass for vehicle and mounting structure for same
US10686245B2 (en) 2016-03-22 2020-06-16 AGC Inc. Back door, and glass antenna
US10985438B2 (en) 2016-07-01 2021-04-20 Nippon Sheet Glass Company, Limited Vehicle window glass

Also Published As

Publication number Publication date
JP5213544B2 (ja) 2013-06-19
CN102067379A (zh) 2011-05-18
WO2009157293A1 (ja) 2009-12-30
JP2010011005A (ja) 2010-01-14

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