JP5470866B2 - Glass antenna for vehicles - Google Patents

Description

  The present invention relates to a glass antenna in which an AM radio broadcast wave receiving antenna and an FM radio broadcast wave receiving antenna provided on a rear window glass of a vehicle such as an automobile are separate antennas, and more particularly, radio waves of FM radio broadcast waves in Japan and overseas. It is related with the glass antenna suitable for receiving.

  Conventionally, glass antennas for receiving AM radio broadcast waves and FM radio broadcast waves require a relatively large area in order to obtain a good reception gain, and are often provided on the rear window glass of an automobile. The rear window glass of an automobile is often provided with a heating line for anti-fogging in the central region for securing a rear view during running in rainy weather. For this reason, when providing a glass antenna in a rear window glass, it had to be provided in the upper margin part and lower margin part of the said heating wire for anti-fogging.

  Furthermore, for receiving radio waves of AM radio waves and FM radio broadcast waves, both radio waves are received by a single antenna provided in the upper margin of the antifogging heating wire, and these AM radio band / FM radio band Most antennas that receive radio waves have a grounded antenna pattern that shares one feeding point.

  When such AM radio broadcast wave and FM radio broadcast wave are received by a single glass antenna, an antenna amplifier is usually provided between the antenna feed point and the tuner, and this is not possible for input to the tuner. In general, ample electromotive force is amplified and input to the tuner.

  In addition, an impedance matching circuit is provided to minimize the loss of reception gain due to the feeder line between the antenna feed point and the tuner, and the device is designed to input to the tuner while maintaining an electromotive force sufficient to input to the tuner. Was also done.

  When the AM broadcast wave and FM broadcast wave antennas are shared, the AM broadcast wave amplifier and the FM broadcast wave amplifier are separately provided for the amplifier, and the received power is amplified and input to the tuner. There are many cases. Alternatively, with respect to the impedance matching circuit, there is a case in which the AM broadcast wave impedance matching circuit and the FM broadcast wave impedance matching circuit suppress a reduction due to loss of reception sensitivity through a path for transmitting the radio wave received by the antenna to the tuner. Many.

  A glass antenna is provided in the upper margin of the rear window glass of a vehicle and is amplified by an amplifier. For example, a microfilm disclosed in Japanese Utility Model No. 63-89982 (Japanese Utility Model Publication No. 2-13311) includes an automobile window. A glass antenna having an antenna conductor provided at a predetermined position of the glass plate; and an amplifier for amplifying the reception sensitivity of the glass antenna, the amplifier being soldered and brazed to a feeding terminal portion of the glass antenna. Or an amplifier mounting structure for an automotive glass antenna that is directly connected by means such as attaching a conductive adhesive, thereby reducing gain loss due to capacity loss in the feeder line portion between the glass antenna and the amplifier. (Patent Document 1).

Furthermore, Japanese Patent Application Laid-Open No. 11-205023 discloses a first coil, a second coil, a first antenna conductor provided on a window glass plate of a vehicle, and a second antenna conductor provided on the window glass plate. A first resonance including the impedance of the first antenna conductor and the inductance of the first coil as a resonance element, and the impedance of the second antenna conductor and the inductance of the second coil as a resonance element. The second antenna conductor has a conductor length and a conductor shape for the first reception frequency band, and the first antenna conductor is higher than the first reception frequency band. It has a conductor length and shape for the second reception frequency band of the frequency, and the resonance frequency of the first resonance and the resonance frequency of the second resonance are more sensitive to the sensitivity of the first reception frequency band, respectively. A frequency such that a first and second antenna conductors have been described for the glass antenna device for a vehicle, characterized by being electrically connected (Patent Document 2).
Microfilm of actual application No. 63-89982 (No. 2-13311) JP 11-205023 A

  In Patent Document 1, an antenna for receiving an AM broadcast wave and an FM broadcast wave is provided in a margin of a rear window glass of an automobile, and the receiving sensitivity of the glass antenna is provided at a feeding terminal of the antenna. A structure in which an amplifier for amplifying the signal is attached is described.

  However, when such an AM antenna and FM antenna are the same antenna, tuning must be performed to satisfy both the AM band and the FM band, and the tuning work becomes complicated. Problems such as enormous work man-hours and reception of both FM radio broadcast wave bands and AM radio broadcast wave bands with one antenna, high reception sensitivity cannot be obtained when receiving FM radio broadcast waves There was a problem.

  On the other hand, in Patent Document 2, two broadcast wave band antennas, a first antenna for a high band and a second antenna for a low band, are provided on an upper part of a defogger of a rear window glass of an automobile. The antenna is capacitively coupled, and the sensitivity of the two frequency bands is improved by using different resonances for each antenna, and both the AM radio band and FM radio band are tuned separately. Therefore, the tuning operation can be simplified. However, when the glass antenna of the present invention is mass-produced, there is a problem that satisfactory reception characteristics cannot always be obtained due to variations in elements of each circuit.

  The present invention aims to solve the above-mentioned problem, that is, in an antenna for receiving an AM broadcast wave and an FM broadcast wave provided in a blank portion of an antifogging heating strip on a rear window glass of an automobile, particularly for an FM radio broadcast wave. An antenna having a high reception gain and an excellent directivity is provided.

That is, the present invention is an AM broadcast wave receiving antenna and an FM broadcast wave receiving antenna provided separately in the upper margin of the antifogging heating filament of the rear window glass of the vehicle,
(A) A plurality of horizontal filaments provided at intervals, and at least two vertical filaments perpendicular to the horizontal filaments are provided apart from each other,
An antenna for receiving an AM broadcast wave having a position between the vertical lines and a position on the uppermost horizontal line or a position provided from the uppermost horizontal line via a lead line;
(B) the upper position than the horizontal strip of the top of the AM broadcast wave receiving antenna, and the outermost peripheral portion of the two said AM broadcast wave receiving antenna from the FM feeding point provided on the left and right sides of the AM feeding point A second horizontal line of the pair of FM broadcast wave receiving antennas along a part of the second horizontal line, a second vertical line extending from the end of the second horizontal line, and a second vertical line extending from the end of the second vertical line The folded horizontal filaments folded in a letter shape are provided in the clockwise and counterclockwise directions so as to be opposite to each other,
(C) and each of the second of the AM broadcast wave receiving antenna the length of the vertical strip portion by differently extended left and right pair of the FM broadcast wave receiving antenna of the pair of left and right FM broadcast wave receiving antenna While enclosing the vicinity of the outermost ends of the horizontal line of
(D) said second horizontal strip and the fold-back horizontal strip, and so each adjacent to and capacitively coupled to horizontal strips and horizontal strips at the bottom of the top of the antenna for the AM broadcast wave receiving it, wherein It is a glass antenna for vehicles.

  Alternatively, the present invention is the above-described glass antenna for a vehicle, wherein a distance between centers of the terminals of the two FM broadcast feeding points is set to 100 mm or more and 400 mm or less.

  Alternatively, in the present invention, the distance between the center between the AM feeding point and the FM broadcasting feeding point is provided at a position of 50 mm or more and 350 mm or less. It is a glass antenna.

  Alternatively, the present invention is the glass antenna for a vehicle according to any one of the above, wherein the FM broadcast wave receiving antenna has a loop shape.

  Alternatively, in the present invention, the loop shape of the FM broadcast wave receiving antenna is present in an upper position, a lower position, or both of the AM broadcast wave receiving antenna. Glass antenna.

  Alternatively, the present invention is the glass antenna for a vehicle according to any one of the above, wherein the two types of FM broadcast wave receiving antennas receive diversity reception or phase diversity reception.

  Alternatively, in the present invention, the horizontal line of the AM broadcast wave receiving antenna is capacitively coupled in proximity to the horizontal line of the antifogging heating line. It is a glass antenna for vehicles.

  Alternatively, in the present invention, the auxiliary vertical wire extending upward from the upper end of the bus bar of the antifogging heating wire is close to the outside of the second vertical wire of the FM broadcast wave receiving antenna. The glass antenna for a vehicle according to any one of the above, wherein the glass antenna is capacitively coupled.

  Alternatively, the present invention has at least a horizontal auxiliary line that branches off from a substantially central part of the lowermost heating line of the anti-fogging heating line and extends in one of the left and right directions or in the horizontal direction of both directions. The glass antenna for a vehicle according to any one of the above-described features.

  Alternatively, the present invention provides the glass antenna for a vehicle described above, wherein the horizontal auxiliary line at the bottom of the horizontal auxiliary line is close to the opening of the body flange and capacitively coupled. is there.

Alternatively, according to the present invention, the total wire length from the FM feeding point to the tip of the FM broadcast wave receiving antenna can be set to a frequency of 76 to 90 MHz in Japan and 88 to 108 MHz in Japan. For all overseas markets, the antenna length is 800 to 2,500 mm.
The second horizontal line of the antenna for receiving FM broadcast waves and the uppermost horizontal line of the antenna for receiving AM broadcast waves are close to each other, and the total length of the horizontal lines of the capacitively coupled portion; and The distance between the strips of the part is set to 800 mm to 2500 mm and 2 to 30 mm for FM broadcast wave receiving antennas for the frequency 76 to 90 MHz band in Japan and the 88 to 108 MHz band outside Japan. The glass antenna for a vehicle according to any one of the above-described features.

  Alternatively, the present invention provides the vehicle for a vehicle according to any one of the above, wherein at least one vertical filament provided so as to cross a plurality of horizontal filaments of the antifogging heating filament is provided. It is a glass antenna.

  According to the present invention, the AM broadcast wave receiving antenna provided in the upper margin of the antifogging heating filament (defogger) of the rear window glass of the vehicle and the pair of left and right FM broadcast waves provided on both sides thereof are provided. Since the antennas are provided separately, the man-hours and time required for tuning each antenna can be greatly reduced.

  Also, an AM broadcast wave receiving antenna is provided so as to be surrounded by an FM broadcast wave receiving antenna in which the length of each of the pair of left and right vertical lines provided on both sides thereof is extended to be different. The second horizontal line of the antenna is capacitively coupled in proximity to the top horizontal line of the AM broadcast wave receiving antenna, and the folded horizontal line is connected to the bottom horizontal line or bottom of the AM broadcast wave receiving antenna. The reception sensitivity of the FM broadcast wave receiving antenna is greatly improved by capacitive coupling in the vicinity of a part of the horizontal line near the bottom.

  Further, since the FM broadcast wave receiving antenna is extended so that the lengths of the pair of left and right second vertical lines provided on both sides of the AM broadcast wave receiving antenna are different, the diversity reception and phase This is effective for receiving diversity.

  In addition, since the uppermost horizontal filament of the antifogging heating filament (defogger) and the lowermost horizontal filament of the AM broadcast wave receiving antenna are brought close to each other and capacitively coupled, the antifogging heating filament ( The AM broadcast wave received by the defogger) can be picked up, and the reception characteristics can be further improved as compared with the case where the AM broadcast wave is received only by the antenna 4 for receiving the AM broadcast wave.

  Further, the folded wire strips 5c and 5c 'positioned at the bottom of the main antenna 5 and the sub-antenna 5' for receiving FM broadcast waves are brought close to the top horizontal strip of the antifogging heating wire (defogger). Since the capacitive coupling is performed, it is possible to pick up the FM broadcast wave received by the antifogging heating wire (defogger), compared with the case where the main antenna 5 and the sub-antenna 5 ′ for receiving the FM broadcast wave are received alone. As a result, reception characteristics can be improved.

  As described above, the AM broadcast wave receiving antenna 4 and the FM broadcast wave receiving antennas 5 and 5 ′ are divided into two antennas, so that each of the AM broadcast wave receiving antenna and the FM broadcast wave receiving antenna is provided. Independent tuning makes it easier and easier to tune, and can be tuned with fewer man-hours.

  In the present invention, the two antennas, the AM broadcast wave receiving antenna 4 and the FM broadcast wave receiving antenna 5, are completely separated from the upper margin of the antifogging heating wire 2 of the rear window glass 1 for the vehicle. An antenna provided in the system. The antifogging heating wire 2 (commonly referred to as defogger) has a plurality of substantially horizontal heating wires 2a arranged in parallel in the central region of the rear window glass 1 for a vehicle, and both ends thereof are electrically conductive bus bars. 3 and 3 'are connected to evaporate moisture on the surface of the window glass by energization heating, thereby providing a function of removing fogging.

  As shown in FIGS. 1 to 4, the AM broadcast wave receiving antenna 4 is provided with a plurality of horizontal filaments provided at intervals, orthogonal to the horizontal filaments, and at least two apart from each other. A power supply for AM that includes a vertical line and is provided between the at least two vertical lines and on the uppermost horizontal line or via the lead line from the uppermost horizontal line. This is point 7.

  At least two vertical filaments of the AM broadcast wave receiving antenna 4 start from the horizontal filament at the uppermost position and extend so that at least one vertical filament is orthogonal to all the horizontal filaments, and the other vertical filaments. The wire is connected perpendicularly to all or part of the horizontal wire.

  Also, the vertical lines 4b, 4b 'intersecting and connecting with the plurality of horizontal lines 4a, 4a, ... are in the vicinity of a position where the plurality of horizontal lines 4a, 4a, ... are divided into approximately three equal parts. However, the plurality of horizontal filaments 4a, 4a,... May not be the same length, may be shifted to the left or right, or the length of one of the left and right may be slightly shorter. good.

  In addition, the vicinity of the position to be approximately divided into three is the vicinity of the position in which the maximum width of the horizontal lines 4a, 4a,. It is good also as the position which moved further to the position of the position of the left-right both sides of a substantially equal part position, and further separating.

  The lowest horizontal line 4a of the AM broadcast wave receiving antenna 4 or the horizontal line 4a 'connected to the lower end of one vertical line is close to the uppermost horizontal line 2a of the antifogging heating line 2. If capacitive coupling is performed, it is desirable because radio waves for AM radio broadcast waves placed on the defogger 2 can be picked up.

  Further, the FM broadcast wave receiving antennas 5 and 5 ′ are located above the uppermost horizontal line 4 a of the AM broadcast wave antenna 4, and two FM feeds provided on both the left and right sides of the AM feed point 7. A pair of FM broadcast wave receiving antennas 5 and 5 ′ are rotated clockwise or counterclockwise so as to be opposite to each other along a part of the outermost periphery of the AM broadcast wave receiving antenna 4 from the points 8 and 8 ′. The AM broadcast wave receiving antenna 4 is surrounded by a pair of left and right FM broadcast wave receiving antennas 5, 5 ′ and at least one of the horizontal stripes 4 a of the AM broadcast wave receiving antenna 4. It is designed to be close and capacitively coupled to the part.

  The lengths of the horizontal lines 4a, 4a,... Of the AM broadcast wave receiving antenna 4 are not necessarily the same, and the number of horizontal lines at the left and right ends of the AM broadcast wave receiving antenna 4 is not necessarily the same. May be different. Therefore, the lengths of the second vertical wires 5b and 5b 'of the pair of left and right FM broadcast wave receiving antennas 5 and 5' that surround the vicinity of both side ends of the AM broadcast wave receiving antenna 4 are all enclosed. The length is different for the left and right, which is convenient when performing diversity reception and phase diversity reception.

  The second horizontal filaments 5a and 5a 'extended from the FM feed points 8 and 8' of the FM broadcast wave receiving antennas 5 and 5 'are the uppermost horizontal stripes 4a of the antenna 4 for receiving the AM broadcast waves. And in a substantially vertical direction along the outline outline of the plurality of horizontal lines 4a, 4a,... Of the AM broadcast wave receiving antenna 4 from the tip of the second horizontal line 5a. Alternatively, the second vertical filament 5b extending in an arc shape is provided, and the folded horizontal filaments 5c and 5c ′ folded in a U-shape from the tip of the second vertical filament 5b are used as the antenna 4 for receiving the AM broadcast wave. The horizontal line 4a is preferably close to the lower part of the horizontal line 4a, but the horizontal line 4a at the uppermost horizontal line 4a and the middle part of the lowermost horizontal line 4a at both end positions of the antenna 4 for receiving the AM broadcast wave. 4a, 4a,... It may be engaged.

  Further, the two second horizontal filaments 5a may be provided, and further, the two tip ends of the two second horizontal filaments 5a and 5a may be connected to form a closed loop shape.

  It is preferable that the distance between the centers of the terminals of the two FM broadcast feed points 8, 8 ′ is 100 mm or more and 400 mm or less, and the AM feed point 7 and the FM broadcast feed points 8, 8 ′. It is convenient to provide the distance between the centers at a position of 50 mm or more and 350 mm or less.

  In other words, if the distance between the AM feeding point 7 and one FM broadcasting feeding point 8 is 50 mm, for example, the distance between the AM feeding point 7 and the other FM broadcasting feeding point 8 ' The distance between the centers is preferably 50 to 350 mm.

  This is because the terminal itself has a width, so the distance between the centers of the two feeding points cannot be made 50 mm or less, and if they are too close, there is a possibility of adversely affecting each other. It is inconvenient.

  The FM broadcast wave receiving antenna 5 has one or two folded horizontal filaments 5c, and a part of the folded one or two folded horizontal filaments 5c is used for the AM broadcast wave receiving antenna 4. Of the horizontal wires 4a, 4a,... Moreover, as shown in FIG. 2, FIG. 3, it can also be set as the closed loop shape which connected the both front-end | tips of two folding | returning filaments.

  As shown in FIGS. 1 to 4, each of the FM broadcast wave receiving antennas 5, 5 ′ has a closed loop-shaped filament, and is provided at an upper position or a lower position of the AM broadcast wave receiving antenna 4. However, as shown in FIGS. 2 and 3, the AM broadcast wave receiving antenna 4 may have a closed loop portion at both the upper position and the lower position.

  Also, as shown in FIG. 4, the auxiliary vertical wires 2c and 2c ′ extending upward from the upper ends of the bus bars 3 and 3 ′ of the antifogging heating wire 2 are connected to the FM broadcast wave receiving antenna 5. It is desirable that they are close to each other along the outside of at least the second vertical filament 5b and capacitively coupled. This is because the radio waves for FM radio broadcast waves placed on the antifogging heating wire 2 can be picked up via the auxiliary vertical wires 2c, 2c '.

  An AM feed point 7 of the AM broadcast wave receiving antenna 4 is sandwiched between two FM feed points 8 and 8 'provided on both sides of the AM feed point 7 on the outermost peripheral portion of the AM broadcast wave receiving antenna 4. The FM broadcast wave receiving antennas 5 and 5 ′, which are extended in the counterclockwise direction and the counterclockwise direction, are configured to receive diversity reception or phase diversity reception.

  The wire length from the FM feed points 8 and 8 'to the tip of the FM broadcast wave receiving antennas 5 and 5' is set to the frequency of 76 to 90 MHz in Japan and 88 to 108 MHz in Japan. The antenna length is 800 to 2,500 mm for all overseas markets.

  Also, the second horizontal line 5a, 5a 'of the antenna for receiving FM broadcast waves, the uppermost horizontal line of the antenna for receiving AM broadcast waves, the folded horizontal lines 5c, 5c', and the AM The horizontal line at the bottom of the antenna for receiving a broadcast wave is close to each other, and the total length of each horizontal line in the portion to be capacitively coupled and the interval between the lines in the portion are in the frequency range of 76 to 90 MHz. The glass antenna for a vehicle according to any one of the above, wherein the antenna for receiving FM broadcast waves for domestic use and for 88-108 MHz band outside Japan is set to 800 to 2500 mm and 2 to 30 mm. .

  The FM broadcast wave receiving antennas 5 and 5 ′ have a sufficiently satisfactory reception characteristic even when only one of them is used. However, one of the antennas 5 and 5 ′ is used as a main antenna and the other is used as a sub-antenna to receive diversity reception or phase diversity reception. (Not shown) is preferable because the directivity is improved as compared with the case where the signal is received by only one of the FM broadcast wave receiving antennas 5 and 5 'and inputted to the tuner (not shown).

  The antifogging heating wire 2 is provided in the central region of the rear window glass 1, and a plurality of substantially horizontal heating wires 2a are arranged substantially horizontally, and both ends thereof are electrically conductive bus bars 3, 3 Connected with 'and heated by energization with a DC power source (not shown).

  Further, the vertical strip 2b connecting the points obtained by dividing each of the plurality of substantially horizontal strips 2a of the heating strip 2 for anti-fogging into approximately three equal parts is a neutral strip that is not energized and is used for anti-fogging. The entire anti-fogging heating wire 2 functions as an antenna, not the heating wire, and improves the reception gain of the AM / FM broadcast wave using the radio wave received by the anti-fogging heating wire 2 However, it is not always necessary.

  Furthermore, the horizontal auxiliary filaments 2d and 2d 'branched from the substantially central part of the lowermost heating filament of the anti-fogging heating filament 2 are extended at one place in any one of the left and right, or two places in both directions. By providing the horizontal auxiliary filaments 2d and 2d ′, the directivity characteristics of each antenna can be improved. The horizontal auxiliary wires 2d and 2d ′ are provided in two upper and lower portions, the impedance is adjusted by the upper horizontal auxiliary wires 2d and 2d ′, and the rear window of the metal body is formed by the lower horizontal auxiliary wires 2d and 2d ′. It is desirable that the radio wave for AM radio wave and the radio wave for FM radio broadcast wave placed on the body can be picked up in close proximity to the flange frame 9 for use.

  As shown in FIG. 4, the auxiliary vertical filaments 2c and 2c ′ extending upward from the upper ends of the two bus bars 3 and 3 ′ of the antifogging heating filament 2 are not necessarily required. Although there is no auxiliary vertical line 2c, 2c ', the outside of the second vertical line 5b, 5b' of the FM broadcast wave receiving antenna 5, 5 'and the upper part of the second horizontal line 5a, 5a' FM radio wave receiving antennas 5 placed on the antifogging heating wire 2 via the auxiliary vertical wires 2c and 2c ′ by being close to each other and capacitively coupled. 5 'can be picked up, and effectively works to widen the frequency characteristics and improve the reception sensitivity.

  The FM broadcast wave receiving antennas 5 and 5 'according to the present invention are not required to connect an amplifier or an impedance matching circuit between the FM feed point of the FM broadcast wave receiving antennas 5 and 5' and the tuner. Needless to say, a further improvement in reception sensitivity can be obtained by connecting an amplifier or an impedance matching circuit.

  Then, the effect | action of this invention is demonstrated.

  In the present invention, the AM broadcast wave receiving antenna 4 and the FM broadcast wave receiving antenna 5 are provided as separate and independent antennas, and therefore can be tuned to a line length suitable for each reception frequency. Tuning work is also easy.

  FMs along the outermost periphery of the AM broadcast wave receiving antenna from the two FM feed points provided above the horizontal line at the top of the AM broadcast wave receiving antenna and on the left and right sides of the AM feed point. The broadcast wave receiving antennas are extended in the clockwise and counterclockwise directions so as to be opposite to each other, and the left and right ends of the horizontal lines of the AM broadcast wave receiving antenna are provided on the left and right sides thereof. The antenna is sandwiched between a pair of FM broadcast wave receiving antennas and is close to and capacitively coupled to the horizontal line of the AM broadcast wave receiving antenna.

  That is, the outermost ends of the plurality of horizontal wires of the AM broadcast wave receiving antenna 4 are sandwiched and surrounded by a pair of left and right FM broadcast wave receiving antennas 5, 5 ′, and the AM broadcast wave receiving antenna 4 The second horizontal line 5a, 5a 'of each of the FM broadcast wave receiving antennas 5, 5' is close and capacitively coupled to the uppermost horizontal line 4a, and the lowermost part of the AM broadcast wave receiving antenna 4 is coupled. The FM broadcast wave band received by the AM broadcast wave antenna 4 can be more surely capacitively coupled by close and capacitively coupling the folded horizontal stripes 5c and 5c ′ to the outside of the horizontal line 4a on the side, that is, the lower side. Can be picked up by the antennas 5 and 5 'for FM broadcast waves, thereby improving the reception sensitivity of the antennas 5 and 5' for receiving FM broadcast waves and obtaining stable performance.

    As shown in FIG. 4, auxiliary vertical wires 2c and 2c 'extending upward from the upper ends of the bus bars 3 and 3' of the heating conductive wire 2 are connected to at least a second of the FM broadcast wave receiving antenna 5. The vertical lines 5b and 5b 'are adjacent to each other along the outer side and capacitively coupled so that the radio waves for FM radio broadcast waves placed on the antifogging heating line 2 are transmitted to the auxiliary vertical lines 2c and 2c. This is because the pickup can be picked up through and the reception gain can be improved.

  The two antennas for receiving FM broadcast waves are, for convenience, one main antenna 5 and the other sub-antenna 5 ', but either may be the main antenna.

  If the sub-antenna 5 'for receiving FM broadcast waves is arranged in the upper margin of the anti-fogging heating wire 2, the antenna sensitivity of substantially the same level as the main antenna 5 for receiving FM broadcast waves can be obtained. By receiving diversity reception or phase diversity reception for the main antenna 5 and the sub-antenna 5 ′, it is possible to complement the reception characteristics and the portion with low directivity characteristics.

  2 to 4, a plurality of horizontal heating wires 2a, 2a,... As shown in FIG. 1 are omitted and are not described. Although it is a figure, it is considered that there are a plurality of heating filaments 2a similar to the anti-fogging heating filament of FIG.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

[Example 1]
As shown in FIG. 1, an AM broadcast wave receiving antenna 4 and an FM broadcast wave band for domestic use in the frequency range of 76 MHz to 90 MHz are formed in the upper margin of the antifogging heating wire 2 of the rear window glass for an automobile. The main and sub FM broadcast wave receiving antennas 5 and 5 'are provided.

  The AM broadcast wave receiving antenna 4 includes eight horizontal wires 4a, 4a,... Provided at intervals and two vertical wires provided so as to be orthogonal to the horizontal wires 4a, 4a,. 4b and 4b ', and the two vertical filaments 4b and 4b' are provided at positions that divide the horizontal filament 4a into approximately three equal parts, and the vertical filament 4b on one side is 8 from the top to the bottom. The other horizontal strip 4b 'is orthogonal to the horizontal strips 4a, 4a,. The horizontal strips 4a, 4a,... Are counted from the upper side of the horizontal strips 4a, 4a,. The horizontal filaments 4a ', 4a', which are different from the horizontal filaments 4a, 4a,... Are connected from the respective leading ends and middle portions of the vertical filaments extending in the upper direction from the upper ends of the vertical filaments 4b '. Furthermore, an AM broadcast wave receiving antenna is provided from the upper end of the vertical wire 4b through a lead wire. Connected to the AM feed point 7 provided above the container 4.

  Of the plurality of horizontal filaments 4a, 4a,..., The length of the first horizontal filament 4a from the top and the first horizontal filament 4a from the bottom is equal to the length of the middle horizontal filament 4a, 4a,. .. Another horizontal line 4a ′, 4a ′ connected to the vertical line 4b ′ is arranged in an empty area due to the shortening compared to the short line, and the lowermost part of the other horizontal line 4a ′ The horizontal filament 4a 'was capacitively coupled in proximity to the uppermost heating filament 2a of the antifogging heating filament 2.

  On the other hand, the main FM broadcast wave receiving antenna 5 has an FM feed point 8 provided in the vicinity of the upper end position of the vertical line 4b of the AM broadcast wave receive antenna 4 and in the vicinity of the AM feed point 7. In a more counterclockwise direction, along the uppermost horizontal line 4a of the AM broadcast wave receiving antenna 4, the second horizontal line 5a is extended so as to be close to each other and capacitively coupled. A second vertical line 5b extending in a substantially vertical direction is extended so as to surround the ends of the horizontal lines extending to the outermost ends of all the horizontal lines 4a, 4a,. This is a U-shaped antenna wire provided with two folded horizontal filaments 5c and 5c which are folded back, and the folded horizontal filaments 5c and 5c are close to each other below the lowermost horizontal filament 4a and capacitively coupled. , The two second horizontal lines 5a, and a closed loop by connecting the ends of 5a.

  Further, the sub FM broadcast wave receiving antenna 5 ′ is arranged in the clockwise direction from the FM feeding point 8 ′ provided in the vicinity of the upper end position of the vertical line 4b ′ of the AM broadcast wave receiving antenna 4. The second horizontal line 5a ′ is extended along the uppermost horizontal line 4a ′ of the AM broadcast wave receiving antenna 4 so as to be close to each other and capacitively coupled, and each horizontal line of the AM broadcast wave receiving antenna 4 is further extended. .., 4a, 4a,... 4a, 4a,..., 4a, 4a,... 5c ′ is a substantially U-shaped antenna wire that is capacitively coupled to the lowermost horizontal wire 4a, and connects both ends of the two second horizontal wires 5a ′ and 5a ′. Closed loop.

  The AM broadcast wave receiving antenna 4 is connected to an AM feeding point 7 and a tuner (not shown), and FM broadcast wave receiving antennas 5 and 5 'are not shown in the same manner as the FM feeding points 8 and 8'. Connected to the tuner.

The glass plate 1 has a substantially trapezoidal shape, and its approximate dimensions are 1,200 mm for the upper side and 1,360 for the lower side.
The inner diameter of the flange of the window frame is 1,100 mm for the upper side, 1,100 mm for the lower side, and 400 mm for the height.

  Moreover, each filament length of the AM broadcast wave receiving antenna 4 of the present invention is as follows.

Each length of the first and second horizontal filaments 4a from the top side = 650mm, 495mm
Each length of the third to sixth horizontal filaments 4a from the upper side = 1,100 mm
Length of first and second horizontal filaments 4a from the bottom side = 650mm, 650mm
Each length of the first and second horizontal filaments 4a 'from the top side = 370mm, 495mm
Spacing between horizontal filaments 4a = 10mm
Each length of the vertical filaments 4b and 4b ′ = 100 mm, 80 mm
Each interval between the vertical filaments 4b and 4b ′ = 310 mm
Moreover, the length of each filament of FM broadcast wave receiving antennas 5 and 5 'of the present invention is as follows.

Each length of the second horizontal filament 5a, 5a ′ = 300 mm, 350 mm
Each length of the second vertical filament 5b, 5b ′ = 90 mm, 80 mm
Lengths of folded horizontal filaments 5c and 5c ′ = 400 mm and 210 mm
The distance between the second horizontal line 5a, 5a 'of the FM broadcast wave receiving antenna 5, 5' and the uppermost horizontal line 4a of the AM broadcast wave receiving antenna 4, and the FM broadcast wave receiving antenna 5 ' The spacing between the folded horizontal filaments 5c and 5c ′ and the horizontal filament 4a at the bottom of the AM broadcast wave receiving antenna 4 was 5 mm.

  The position of the AM feeding point 7 is located 120 mm to the left of the center line of the glass plate 1, and this position is a substantial extension of the vertical line 4 b of the AM broadcast wave receiving antenna 4 and the vertical line 2 b ′ of the defogger 2. It is above.

  On the other hand, the second horizontal line 5a of the FM broadcast wave receiving main antenna 5 is close to the left end of the uppermost horizontal line 4a of the AM broadcast wave receiving antenna 4 by a length of 290 mm. The AM broadcast wave receiving antenna 4 is made to approach the left end of the lowermost horizontal filament 4a by a length of 400 mm.

  Further, the second horizontal line 5a ′ of the FM broadcast wave receiving sub-antenna 5 ′ and the uppermost horizontal line 4a ′ of the AM broadcast wave receiving antenna 4 are close to each other by a length of 345 mm, and the folded horizontal line 5c ′ and the AM broadcast wave receiving antenna 4 were placed close to each other by a length of 210 mm from the right end of the lowermost horizontal filament 4a.

  The distance between the uppermost horizontal line 4a of the AM broadcast wave receiving antenna 4 and the inner side of the upper side of the body flange 9 is 30 mm, and the distance between the lowermost horizontal line 4a and the uppermost heating line 2a. About 20 mm away.

  These AM broadcast wave receiving antenna 4, FM broadcast wave receiving main antenna 5, FM broadcast wave receiving sub-antenna 5 ′, heating conductive wire 2, feed points 7, 8, 8 ′, bus bar 3, 3 ′ is formed by printing on a glass plate surface with a conductive paste such as silver paste and baking.

  The window glass plate thus obtained is mounted on the rear window of the automobile, and further connected to a tuner (not shown) by a feeder line from the AM feed point of the AM broadcast wave receiving antenna 4, and the FM broadcast wave receiving antenna. As for 5 and 5 ', FM feed points 8 and 8' were connected to a tuner (not shown) through feeder lines, respectively.

  The FM broadcast wave receiving main antenna 5 and sub-antenna 5 ′ are configured to receive diversity reception or phase diversity reception in order to improve directivity, and any of them may be a main antenna. .

As a result of receiving each of the FM main antenna 5 and the FM sub-antenna 5 ′, as shown in FIG. 5, the average reception gain of the horizontal polarization of the FM broadcast wave band for Japan from 76 MHz to 90 MHz is Respectively, the frequency becomes -16.2 dBd (dipole antenna ratio), and the result of diversity reception with the two FM antennas, the FM main antenna 5 and the FM sub-antenna 5 ', shows that the 76 MHz to 90 MHz FM broadcast It was found that the average reception gain of the horizontally polarized wave in the waveband was −13.1 dBd (dipole antenna ratio), and a reception gain much superior to the conventional one was obtained.

  Further, the AM broadcast wave is amplified by an AM broadcast wave band amplifier as in the prior art, so there is no practical problem.

  As shown in FIG. 1, the AM broadcast wave receiving antenna horizontal FM line and the second horizontal line of the FM broadcast wave receiving antenna are closely and capacitively coupled as shown in FIG. In both cases, the reception characteristics improved.

[Example 2]
In the second embodiment shown in FIG. 2, an AM broadcast wave receiving antenna 4 and a frequency of 88 MHz to 108 MHz in the United States, Europe, Australia are provided in the upper margin of the anti-fogging heating wire 2 of the rear window glass for automobiles. The main and sub FM broadcast wave receiving antennas 5 and 5 ′ of the FM broadcast wave band for foreign countries including the above are provided.

  As in the first embodiment, the AM broadcast wave receiving antenna 4 including seven horizontal filaments provided in the upper margin of the antifogging heating filament and two vertical filaments orthogonal thereto, and the AM broadcast A substantially U-shaped FM broadcast wave receiving main antenna 5 and a sub-antenna 5 ′, which are sandwiched from both sides of the wave receiving antenna 4, are provided close to each other.

  The difference from the first embodiment is that there are seven horizontal lines of AM broadcast wave receiving antennas, and the lengths of the two folded horizontal lines 5c of the main antenna 5 for FM broadcast wave reception are approximately doubled. The middle part is connected to form a closed loop, and the vertical line 4b ′ of the AM broadcast wave receiving antenna 4 is extended upward, and one horizontal line 4a ′ is provided in an L shape at the upper end. The second horizontal line 5a ′ of the sub FM broadcast wave receiving antenna 5 ′ is brought close to the horizontal line 4a ′ and capacitively coupled.

  Moreover, each filament length of the AM broadcast wave receiving antenna 4 of the present invention is as follows.

The length of the first horizontal filament 4a from the upper side = 555mm
Each length of the 2-5th horizontal filament 4a from the upper side = each 1,100 mm
Length of the 6th horizontal filament 4a from the top side = 900mm
Length of the seventh horizontal filament 4a from the upper side = 690mm
Length of the first horizontal filament 4a 'from the upper side = 345mm
Spacing between horizontal filaments 4a = 10mm
Each length of vertical filament 4b, 4b '= 95mm, 80mm
Each interval between the vertical filaments 4b and 4b ′ = 310 mm
Moreover, the length of each filament of FM broadcast wave receiving antennas 5 and 5 'of the present invention is as follows.

Each length of the second horizontal filament 5a, 5a ′ = 310 mm, 350 mm
Each length of the second vertical filament 5b, 5b ′ = 90 mm, 80 mm
Each length of the folded horizontal filament 5c = 700 mm, 700 mm
Each length of the folded horizontal filament 5c ′ = 390 mm, 390 mm
The spacing between the second horizontal wires 5a, 5a 'of the FM broadcast wave receiving antennas 5, 5' and the uppermost horizontal wires 4a, 4a 'of the AM broadcast wave receiving antenna 4, and the FM broadcast wave receiving antenna The distance between the upper horizontal strips 5 and 5 ′ of the folded horizontal strips 5c, 5c and 5c ′ and 5c ′ and the horizontal strip 4a at the bottom of the AM broadcast wave receiving antenna 4 was 5 mm.

  The distance between the folded horizontal filaments 5c and 5c 'of the FM broadcast wave receiving antennas 5 and 5' and the uppermost heating filament 2a of the antifogging heating filament 2 is set to 10 mm as in the first embodiment. The positions of the feeding point 7 and the FM feeding points 8 and 8 ′ were provided at substantially the same positions as in the first embodiment.

On the other hand, the second horizontal line 5a of the FM broadcast wave receiving main antenna 5 is close to the left end of the uppermost horizontal line 4a of the AM broadcast wave receiving antenna 4 by a length of 280 mm, and is used for FM broadcast wave reception. The second horizontal line 5a ′ of the sub-antenna 5 ′ is brought close to the uppermost horizontal line 4a ′ of the AM broadcast wave receiving antenna 4 by a length of 345 mm, and the folded horizontal line 5c is the AM broadcast wave receiving antenna 4 The horizontal horizontal line 5c ′ is closer to the left end of the lower horizontal line 4a by 690 mm, and the folded horizontal line 5c ′ is closer to the right end of the lowermost horizontal line 4a of the AM broadcast wave receiving antenna 4 by a length of 380 mm. I tried to make it.
The distance between the uppermost horizontal line 4a of the AM broadcast wave receiving antenna 4 and the inner side of the upper side of the flange (not shown) is 30 mm, and the distance between the lowermost horizontal line 4a and the uppermost heating line 2a. About 20 mm away.

  These AM broadcast wave receiving antenna 4, FM broadcast wave receiving main antenna 5, FM broadcast wave receiving sub-antenna 5 ′, and heating conductive wire 2, each feeding point, and bus bar are made of conductive paste such as silver paste. It is formed by printing on a glass plate surface and firing.

  The window glass plate thus obtained is attached to the rear window of the automobile, and, similarly to the first embodiment, the AM feeding point of the AM broadcast wave receiving antenna 4, and the FM broadcast wave receiving antenna 5, 5 'FM feed points 8, 8' were each connected to a tuner (not shown) by feeder lines.

As a result of the reception by the FM main antenna 5 and the FM sub antenna 5 ′, as shown in FIG. 6, the average reception gain of the vertically polarized FM broadcast wave band for the outside of 88 MHz to 108 MHz is −10.8 dBd and −11.0 dBd (dipole antenna ratio), and the result of diversity reception with the FM main antenna 5 and the FM sub-antenna 5 ′ in the two FM antennas is 88 MHz˜ The average reception gain of vertically polarized waves in the FM broadcast wave band of 108 MHz is −9.7 dBd (dipole antenna ratio), and it has been found that the reception gain can be greatly improved compared to the conventional case.

  Further, the AM broadcast wave is amplified by an AM broadcast wave band amplifier as in the prior art, so there is no practical problem.

  Such an AM broadcast wave receiving antenna horizontal line 4a, 4a 'and an FM broadcast wave receiving antenna second horizontal line 5a, 5a' or folded horizontal line 5c, 5c 'as shown in FIG. In addition, due to capacitive coupling, high reception characteristics were obtained for both AM broadcast waves and FM broadcast waves.

[Example 3]
The third embodiment shown in FIG. 3 is a modification of the second embodiment. The main antenna 5 and the sub-antenna 5 ′ used for receiving FM broadcast waves for the overseas frequency band 88 to 108 MHz are substantially U-shaped. The AM broadcast wave receiving antenna is provided so as to be surrounded from both sides, and an auxiliary horizontal line 2d branched from the lowest line of the antifogging heating line is provided, and the auxiliary horizontal line 2d is provided on the body. The point close to the lower side of the opening of the flange is greatly different. The AM broadcast wave receiving antenna 4 and the FM broadcast wave receiving antennas 5 and 5 'are the first from the top of the AM broadcast wave receiving antenna. Almost implemented except that the length of the horizontal line 4a is slightly shortened and the length of the line adjacent to the anti-fogging heating line of the folded horizontal line 5c of the FM broadcast wave receiving antenna 5 is slightly shortened. Same as example 2 Pattern, is the dimension.

  Compared with the first and second embodiments in which the auxiliary horizontal filament 2d is not provided by providing the auxiliary horizontal filament 2d that branches off from the lowest line of the antifogging heating filament, the radio waves of the FM broadcast wave are horizontally polarized and vertical. The directivity characteristics have greatly improved outside of Japan such as North America and Europe where polarized waves are present.

Each of the FM main antenna 5 and the FM sub-antenna 5 'in this embodiment is 88.
As a result of receiving FM broadcast waves for MHz to 108 MHz overseas, the average reception gains of vertically polarized waves are −10.2 dBd and −11.6 dBd (dipole antenna ratio), respectively, and the main antenna 5 for FM, As a result of diversity reception using two FM antennas, the FM sub-antenna 5 ', the average reception gain of the vertically polarized wave of the FM broadcast wave band is -7.7 dBd (dipole antenna ratio), which is compared with the conventional case. As a result, it was found that the reception gain was greatly improved.

  Further, the AM broadcast wave is amplified by an AM broadcast wave band amplifier as in the prior art, so there is no practical problem.

  Such an AM broadcast wave receiving antenna horizontal line 4a, 4a 'and an FM broadcast wave receiving antenna second horizontal line 5a, 5a' or folded horizontal line 5c, 5c 'as shown in FIG. In addition, due to capacitive coupling, high reception characteristics were obtained for both AM broadcast waves and FM broadcast waves.

[Example 4]
The fourth embodiment shown in FIG. 4 is a modification of the first embodiment. The main antenna 5 and the sub-antenna 5 ′ used for receiving FM broadcast waves in the frequency band of 76 to 90 MHz for Japan are substantially connected. As a letter-like pattern, the AM horizontal wave receiving antenna is provided so as to surround all horizontal lines from the outermost ends, and the auxiliary horizontal line 2d branched from the lowest line of the antifogging heating line is provided. The auxiliary vertical wires 2c and 2c 'extending above the upper ends of the two bus bars 3 and 3' of the antifogging heating wire are provided on the FM broadcast wave receiving antennas 5 and 5 '. Example 1 is different from Example 1 except that the second vertical filaments 5b, 5b ′ and the second horizontal filaments 5a, 5a ′ are close to each other along the outside and capacitively coupled. It is almost the same.

  Compared to the first and second embodiments in which the auxiliary horizontal filament 2d is not provided by providing the auxiliary horizontal filament 2d branched from the lowest line of the antifogging heating filament, the FM broadcast wave is horizontally polarized, The directivity characteristics have greatly improved outside of Japan, such as North America and Europe, which are vertically polarized.

  Further, auxiliary vertical wires 2c and 2c ′ extending upward from the upper end portions of the two bus bars of the antifogging heating wire are provided as second vertical wires 5b and 5b ′ of the FM broadcast wave receiving antenna. Capacitive coupling with the defogger compared to the first to third embodiments in which the auxiliary vertical filaments 2c and 2c ′ are not provided by being close and capacitively coupled along the outside of the second horizontal filaments 5a and 5a ′. As a result, the FM broadcast wave on the defogger could be effectively picked up, and the reception performance was greatly improved.

76 in each of the FM main antenna 5 and the FM sub-antenna 5 'in this embodiment.
As a result of receiving FM broadcast waves for domestic use at ~ 90 MHz, the average reception gain of horizontally polarized waves is equivalent to that of Examples 1 to 3, and it can be seen that the reception gain can be greatly improved compared to the conventional case. It was.

  Further, the AM broadcast wave is amplified by an AM broadcast wave band amplifier as in the prior art, so there is no practical problem.

  Such an AM broadcast wave receiving antenna horizontal line 4a, 4a 'and an FM broadcast wave receiving antenna second horizontal line 5a, 5a' or folded horizontal line 5c, 5c 'are close as shown in FIG. In addition, due to capacitive coupling, high reception characteristics were obtained for both AM broadcast waves and FM broadcast waves.

The front view which shows Example 1 provided in the rear window glass for vehicles of this invention. The front view which shows Example 2 provided in the rear window glass for vehicles of this invention. The front view which shows Example 3 provided in the rear window glass for vehicles of this invention. The front view which shows Example 4 provided in the rear window glass for vehicles of this invention. The frequency characteristic figure of the horizontal polarization of Example 1 of this invention. The frequency characteristic figure of the vertical polarization of Example 2 of this invention.

DESCRIPTION OF SYMBOLS 1 Window glass plate 2 Heating strip for anti-fog 2a Heating strip 2b, 2b 'Vertical strip 2c, 2c' Auxiliary vertical strip 2d, 2d 'Auxiliary horizontal strip 3, 3' Bus bar 4 AM broadcast wave receiving antenna 4a 4a ′ horizontal line 4b, 4b ′ vertical line 5, 5 ′ FM broadcast wave receiving antenna 5a, 5a ′ second horizontal line 5b, 5b ′ second vertical line 5c, 5c ′ folded horizontal line 7 AM Feed point 8, 8 'FM feed point 9 Flange frame

Claims (12)

An AM broadcast wave receiving antenna and an FM broadcast wave receiving antenna provided separately in the upper margin of the heating wire for anti-fogging of the rear window glass of the vehicle,
(A) A plurality of horizontal filaments provided at intervals, and at least two vertical filaments perpendicular to the horizontal filaments are provided apart from each other,
An antenna for receiving an AM broadcast wave having a position between the vertical lines and a position on the uppermost horizontal line or a position provided from the uppermost horizontal line via a lead line;
(B) the upper position than the horizontal strip of the top of the AM broadcast wave receiving antenna, and the outermost peripheral portion of the two said AM broadcast wave receiving antenna from the FM feeding point provided on the left and right sides of the AM feeding point A second horizontal line of the pair of FM broadcast wave receiving antennas along a part of the second horizontal line, a second vertical line extending from the end of the second horizontal line, and a second vertical line extending from the end of the second vertical line The folded horizontal filaments folded in a letter shape are provided in the clockwise and counterclockwise directions so as to be opposite to each other,
(C) and each of the second of the AM broadcast wave receiving antenna the length of the vertical strip portion by differently extended left and right pair of the FM broadcast wave receiving antenna of the pair of left and right FM broadcast wave receiving antenna While enclosing the vicinity of the outermost ends of the horizontal line of
(D) The second horizontal line and the folded horizontal line are respectively close to and capacitively coupled to the uppermost horizontal line and the lowermost horizontal line of the AM broadcast wave receiving antenna .
The glass antenna for vehicles characterized by the above-mentioned. 2. The glass antenna for a vehicle according to claim 1, wherein a distance between centers of the terminals of the two FM broadcast feeding points is 100 mm or more and 400 mm or less. The glass antenna for a vehicle according to claim 1 or 2 , wherein a distance between the AM feeding point and the center between the FM broadcasting feeding point is provided at a position of 50 mm or more and 350 mm or less. The glass antenna for a vehicle according to any one of claims 1 to 3 , wherein the FM broadcast wave receiving antenna has a loop shape. The glass antenna for a vehicle according to claim 4 , wherein the loop shape of the FM broadcast wave receiving antenna exists at an upper position, a lower position, or both of the AM broadcast wave receiving antenna. The glass antenna for a vehicle according to any one of claims 1 to 5 , wherein the two types of FM broadcast wave receiving antennas receive diversity reception or phase diversity reception. The horizontal strip of the AM broadcast wave receiving antenna, a vehicle according to any one of claims 1 to 6, characterized in that so as to be in close proximity capacitive coupling to the horizontal strip of the defogging heater strips Glass antenna. An auxiliary vertical wire extending upward from the upper end of the bus bar of the antifogging heating wire is close to the outside of the second vertical wire of the FM broadcast wave receiving antenna and is capacitively coupled. glass antenna for a vehicle according to any one of claims 1 to 7, characterized in that the. The at least horizontal auxiliary filament that branches off from a substantially central portion of the lowest heating filament of the anti-fogging heating filament and extends in one of the left and right directions or in the horizontal direction of both directions. The glass antenna for vehicles in any one of 1 thru | or 8 . The glass antenna for a vehicle according to claim 9 , wherein the horizontal auxiliary line at the bottom of the horizontal auxiliary line is close to the opening of the body flange and is capacitively coupled. The total wire length from the FM feed point to the tip of the FM broadcast wave receiving antenna is the antenna length for both domestic and overseas frequencies of 76-90 MHz and 88-108 MHz. 800 to 2,500 mm, and the second horizontal line of the FM broadcast wave receiving antenna and the uppermost horizontal line of the AM broadcast wave receiving antenna are close to each other and capacitively coupled. The total length of the horizontal stripes and the interval between the stripes of the horizontal stripes are set to 800 mm to 2, for both FM domestic and overseas antennas for frequency broadcasts in the 76 to 90 MHz band and in the 88 to 108 MHz band outside Japan. The glass antenna for a vehicle according to any one of claims 1 to 10 , wherein the glass antenna is 500 mm and 2 to 30 mm. The glass antenna for a vehicle according to any one of claims 1 to 11 , wherein at least one vertical wire provided so as to cross a plurality of horizontal wires of the antifogging heating wire is provided.