JP4873127B2 - Filter cover mounting method and antenna device - Google Patents

Description

  The present invention relates to an antenna device for receiving radio waves of digital radio broadcasting and a filter cover mounting method used for the antenna device.

  Recently, a digital radio receiver that can receive a digital radio broadcast by receiving a satellite wave or a ground wave has been developed and put into practical use in the United States. This digital radio receiver is mounted on a mobile station such as an automobile, and can receive radio waves by receiving radio waves having a frequency of about 2.3 GHz. That is, the digital radio receiver is a radio receiver capable of listening to mobile broadcasts. Since the frequency of the received radio wave is about 2.3 GHz, the reception wavelength (resonance wavelength) λ at that time is about 128.3 mm. The terrestrial wave is a satellite wave that is once received by the earth station, then slightly shifted in frequency, and retransmitted with linearly polarized waves.

  A reception system for receiving this type of satellite wave or terrestrial wave includes an antenna unit (antenna device) and a tuner unit (satellite radio tuner). The antenna unit (antenna device) receives a satellite wave or a ground wave and outputs a high-frequency reception signal. The tuner unit (satellite radio tuner) includes a frequency conversion unit that converts a received signal into a frequency converted signal having a frequency lower than the frequency of the received signal. Specifically, this frequency conversion signal is an intermediate frequency (IF) signal, and is a signal having a frequency in the 23 MHz band. The tuner unit (satellite radio tuner) has a SAW (Surface Acoustic Wave) filter in order to pass the frequency conversion signal. The SAW filter applies the frequency conversion signal to a demodulation unit, and causes the demodulation unit to convert the frequency conversion signal into an audio signal.

  In a conventional receiving system, an antenna unit (antenna device) and a tuner unit (satellite radio tuner) are configured in a state of being separated from each other. In other words, the conventional antenna device includes an antenna element that receives a satellite wave or a terrestrial wave, and a low noise amplifier (LNA) that amplifies the radio wave received by the antenna element and outputs a received signal. It is composed of

  On the other hand, the receiver main body (head unit) is classified into a tuner-mounted head unit equipped with a satellite radio tuner and a tuner-uninstalled head unit not equipped with a satellite radio tuner.

  1 and 2 show first and second conventional receiving systems, respectively. A first conventional receiving system 10A shown in FIG. 1 uses a tuner-mounted head unit 30A as a head unit. A second conventional receiving system 10B shown in FIG. The mounting head unit 30B is used.

  As shown in FIG. 1, the first conventional receiving system 10A includes an antenna device 20A and a tuner-mounted head unit 30A. The antenna device 20A and the tuner-mounted head unit 30A are connected via an RF coaxial cable 40A. The antenna device 20 </ b> A includes an antenna element 21 and a low noise amplifier (LNA) 22. The tuner-mounted head unit 30A is equipped with a satellite radio tuner 60A.

  As shown in FIG. 2, the second conventional reception system 10 </ b> B includes an antenna device 20 </ b> A, a tuner-uninstalled head unit 30 </ b> B, and a satellite radio receiver 50. The antenna device 20A and the satellite radio receiver 50 are connected via an RF coaxial cable 40A. The satellite radio receiver 50 and the tuner-uninstalled head unit 30B are connected via a bus cable 40B. The satellite radio receiver 50 is equipped with a satellite radio tuner 60A.

  In the first conventional receiving system 10A having the configuration shown in FIG. 1, a set maker uses a head unit (external device) 30A when designing a satellite radio tuner compatible model regardless of a satellite radio broadcast viewing contract. It is necessary to mount the satellite radio tuner 60A.

  On the other hand, in the second conventional receiving system 10B shown in FIG. 2, a satellite radio receiver 50 equipped with a satellite radio tuner 60A is required in addition to the head unit (external device) 30B.

  Further, since the RF coaxial cable 40A has gain loss, there is also a problem that the cable length cannot be made too long.

  Therefore, the present applicants proposed an antenna device that does not require a satellite radio tuner to be installed in an external device and listens to satellite radio broadcasts, and that does not require a satellite radio receiver (Japanese Patent Application 2005). No. 20537).

  The antenna device includes an antenna unit that receives a satellite wave or a ground wave and outputs a reception signal, a frequency conversion unit that converts the reception signal into a frequency conversion signal having a frequency lower than the frequency of the reception signal, and a frequency conversion A demodulating unit that converts the signal into an audio signal and an interface unit that converts the audio signal into an output signal for sending to an external device are provided. The frequency conversion unit includes a filter that passes the frequency conversion signal.

  More specifically, the antenna device has a circuit board having first and second main surfaces. The antenna unit is mounted on the first main surface, and the frequency conversion unit, the demodulation unit, the interface unit, and the filter are mounted on the second main surface.

  A filter cover that performs electromagnetic shielding of the filter is mounted on the second main surface. Further, an outer shield cover (aluminum die casting) is mounted on the second main surface so as to cover the frequency conversion unit, the demodulation unit, the interface unit, and the filter cover. The external shield cover serves as an electromagnetic shield for the frequency conversion unit, the demodulation unit, the interface unit, and the filter cover.

  The filter cover includes a cover main body and an earth spring for grounding the cover main body by making contact with the outer shield cover.

  A first conventional filter cover will be described with reference to FIGS. 3, 4, and 5. In this filter cover, the cover main body 121 and the earth spring 122 are separate bodies, and are manually attached with solder 123 or the like, and the cover main body 121 and the earth spring 122 have an integral structure. In this structure, manual attachment with solder 123 or the like is necessary.

  Referring to FIG. 6, a second conventional filter cover is shown. In this filter cover, the cover main body 121 and the earth spring 122 are integrated without being soldered. This filter cover is obtained by cutting and raising the ground spring 122 from the cover main body 121. However, in this structure, a hole is opened in the cover main body 121 due to the springing up of the ground spring 122. Opening a hole in the cover main body 121 degrades the effect of the electromagnetic shielding of the filter cover.

  In Patent Document 1, a slit that can be positioned by the outer shape of an electronic component is provided around the shield cover. When the shield cover is mounted, the slit is fitted into the gap between the electronic component and the flange around the shield cover. The shield structure of the electronic device is shown in which the flange is brought into contact with the copper foil around the reference potential of the substrate. However, since this shield cover has a structure in which a slit is fitted in the gap between the electronic components and mounted, a plurality of electronic components are required for mounting, and there is no flexibility in mounting the shield cover.

  Patent Document 2 discloses a spring member that protrudes from the upper surface side of the shield case and electrically contacts a metal sheet. However, in this structure, the shield case and the spring member are formed as separate parts, and then an operation for forming an integral structure is required.

  Patent Document 3 discloses a shield case in which a tongue piece for grounding is raised from a lid. However, in this structure, as with the filter cover of FIG. 6, a hole is opened in the lid by cutting and raising.

  Patent Document 4 discloses a tongue-shaped ground claw formed by cutting and raising on the surface of a base cover. This also opens a hole in the lid.

  Patent Document 5 discloses a shield case in which the lid body is grounded through a tongue piece cut and raised from the lid body. This also opens a hole in the lid.

JP 2000-59065 A JP 2000-244168 A JP 2002-299875 A Japanese Patent Laid-Open No. 6-2751979 JP-A-8-139487

As described above, conventionally, it is not possible to obtain a filter cover in which the cover main body and the earth spring are integrally structured, the hole is not opened, and the electromagnetic shielding effect is good.
Accordingly, the first object of the present invention is to obtain a filter cover in which the cover body and the ground spring are integrated, the cover upper plate of the cover body is not perforated, and the electromagnetic shielding effect is good. is there.

  A second object of the present invention is to provide a method for mounting a filter cover that achieves the first object on a circuit board.

  A third problem of the present invention is to provide an antenna device having a filter cover that has achieved the first problem.

According to the first embodiment of the present invention,
A method of mounting a filter cover for electromagnetic shielding of a filter mounted on a main surface of a circuit board on the main surface,
The filter cover covers the upper portion of the filter, a cover upper plate which is not holed, and a cover plate of at least three sides covering at least part of the side of the filter, from said end portion of said cover upper plate Extending along the upper surface of the cover upper plate toward the opposite end of the cover upper plate and contacting the plate surface of the plate-like outer shield cover parallel to the main surface, the filter cover In the filter cover mounting method having a shape having a ground leaf spring for grounding,
A flat cover having an upper plate portion having no holes, to be the cover upper plate, a side plate portion to be the cover side plate of the at least three surfaces, and a plate spring portion to be the ground leaf spring; Steps to prepare,
Bending the flat cover into the shape to obtain the filter cover;
In the state where the flat cover is folded into the shape, the cover upper plate covers the upper portion of the filter, and the at least three cover side plates cover the side of the filter. And a step of mounting on the main surface.

According to the second embodiment of the present invention,
A method of mounting a filter cover for electromagnetic shielding of a filter mounted on a main surface of a circuit board on the main surface,
The filter cover includes a cover upper plate that does not have a hole covering the upper portion of the filter, a four-side cover side plate that covers a side portion of the filter, and an end of the cover upper plate that faces the cover upper plate. An earth for grounding the filter cover by extending along the upper surface of the cover upper plate toward the end and contacting the plate surface of the plate-like outer shield cover parallel to the main surface. In the filter cover mounting method having a shape having a leaf spring,
A flat cover having an upper plate portion having no holes, to be the cover upper plate, a side plate portion to be the four-side cover side plate, and a leaf spring portion to be the ground leaf spring; Steps to prepare,
Bending the flat cover into the shape to obtain the filter cover;
In the state where the filter cover is folded in the shape of the flat cover, the cover upper plate covers the upper portion of the filter, and the four cover side plates cover the side portions of the filter. A filter cover mounting method comprising: mounting on the main surface.

According to the third embodiment of the present invention,
An antenna unit that receives a satellite wave or a terrestrial wave and outputs a reception signal; and when the reception signal is converted into a frequency conversion signal having a frequency lower than the frequency of the reception signal, the frequency conversion signal is passed through. A filter used in the above, a demodulator that converts the frequency-converted signal into an audio signal, and a circuit board having first and second main surfaces facing each other,
The antenna unit is mounted on the first main surface,
The filter and the demodulation unit are antenna devices mounted on the second main surface,
The antenna device is mounted on the second main surface and mounted so as to cover the demodulator and the filter cover on the second main surface, and a filter cover for electromagnetically shielding the filter. And an outer shield cover for performing electromagnetic shielding between the demodulator and the filter cover ,
The filter cover covers the upper portion of the filter, a cover upper plate which is not holed, and a cover plate of at least three sides covering at least part of the side of the filter, from said end portion of said cover upper plate By extending along the upper surface of the cover upper plate toward the opposite end of the cover upper plate and contacting the plate surface of the plate-like outer shield cover parallel to the second main surface, And having a shape having a ground leaf spring for grounding the filter cover,
The filter cover includes, in advance, an upper plate portion having no holes, which is to be the cover upper plate, a side plate portion to be the cover side plate of the at least three surfaces, and a leaf spring portion to be the ground leaf spring. An antenna device is obtained in which a flat cover having a shape is mounted on the second main surface in a state where the cover is bent into the shape described above.

According to a fourth embodiment of the invention,
An antenna unit that receives a satellite wave or a terrestrial wave and outputs a reception signal; and when the reception signal is converted into a frequency conversion signal having a frequency lower than the frequency of the reception signal, the frequency conversion signal is passed through. A filter used in the above, a demodulator that converts the frequency-converted signal into an audio signal, and a circuit board having first and second main surfaces facing each other,
The antenna unit is mounted on the first main surface,
The filter and the demodulation unit are antenna devices mounted on the second main surface,
The antenna device is mounted on the second main surface and mounted so as to cover the demodulator and the filter cover on the second main surface, and a filter cover for electromagnetically shielding the filter. And an outer shield cover for performing electromagnetic shielding between the demodulator and the filter cover ,
The filter cover includes a cover upper plate that does not have a hole covering the upper portion of the filter, a four-side cover side plate that covers a side portion of the filter, and an end of the cover upper plate that faces the cover upper plate. The filter cover is grounded by extending along the upper surface of the cover upper plate toward the end and in contact with the plate surface of the plate-like outer shield cover parallel to the second main surface. Having a shape with a grounding leaf spring to remove,
The filter cover includes, in advance, an upper plate portion that does not have a hole to be the cover upper plate, a side plate portion that is to be the cover side plate of the four surfaces, and a leaf spring portion that is to be the ground leaf spring. An antenna device is obtained in which a flat cover having a flat cover is mounted on the second main surface in a state where the cover is bent into the shape described above.

According to a fifth embodiment of the invention,
An antenna unit that receives a satellite wave or a ground wave and outputs a reception signal, a frequency conversion unit that converts the reception signal into a frequency conversion signal having a frequency lower than the frequency of the reception signal, and the frequency conversion signal as audio A demodulator for converting the signal, an interface unit for converting the audio signal into an output signal for sending to an external device, and a circuit board having first and second main surfaces facing each other,
The frequency conversion unit includes a filter that passes the frequency conversion signal,
The antenna unit is mounted on the first main surface,
The frequency conversion unit, the demodulation unit, the interface unit, and the filter are antenna devices mounted on the second main surface,
The antenna device is mounted on the second main surface, and a filter cover for electromagnetically shielding the filter; on the second main surface, the frequency converter, the demodulator, the interface, and the interface An outer shield cover that is mounted so as to cover the filter cover, and that electromagnetically shields the frequency conversion unit, the demodulation unit, the interface unit, and the filter cover;
The filter cover covers the upper portion of the filter, a cover upper plate which is not holed, and a cover plate of at least three sides covering at least part of the side of the filter, from said end portion of said cover upper plate By extending along the upper surface of the cover upper plate toward the opposite end of the cover upper plate and contacting the plate surface of the plate-like outer shield cover parallel to the second main surface , And having a shape having a ground leaf spring for grounding the filter cover,
The filter cover includes, in advance, an upper plate portion having no holes, which is to be the cover upper plate, a side plate portion to be the cover side plate of the at least three surfaces, and a leaf spring portion to be the ground leaf spring. An antenna device is obtained in which a flat cover having a shape is mounted on the second main surface in a state where the cover is bent into the shape described above.

According to the sixth embodiment of the present invention,
An antenna unit that receives a satellite wave or a ground wave and outputs a reception signal, a frequency conversion unit that converts the reception signal into a frequency conversion signal having a frequency lower than the frequency of the reception signal, and the frequency conversion signal as audio A demodulator for converting the signal, an interface unit for converting the audio signal into an output signal for sending to an external device, and a circuit board having first and second main surfaces facing each other,
The frequency conversion unit includes a filter that passes the frequency conversion signal,
The antenna unit is mounted on the first main surface,
The frequency conversion unit, the demodulation unit, the interface unit, and the filter are antenna devices mounted on the second main surface,
The antenna device is mounted on the second main surface, and a filter cover for electromagnetically shielding the filter; on the second main surface, the frequency converter, the demodulator, the interface, and the interface An outer shield cover that is mounted so as to cover the filter cover, and that electromagnetically shields the frequency conversion unit, the demodulation unit, the interface unit, and the filter cover;
The filter cover includes a cover upper plate that does not have a hole covering the upper portion of the filter, a four-side cover side plate that covers a side portion of the filter, and an end of the cover upper plate that faces the cover upper plate. The filter cover is grounded by extending along the upper surface of the cover upper plate toward the end and in contact with the plate surface of the plate-like outer shield cover parallel to the second main surface. Having a shape with a grounding leaf spring to remove,
The filter cover includes, in advance, an upper plate portion that does not have a hole to be the cover upper plate, a side plate portion that is to be the cover side plate of the four surfaces, and a leaf spring portion that is to be the ground leaf spring. An antenna device is obtained in which a flat cover having a flat cover is mounted on the second main surface in a state where the cover is bent into the shape described above.

  In the filter cover mounting method and the antenna device described above, the filter may be a SAW (Surface Acoustic Wave) filter.

According to the present invention, a filter cover that has an integrated structure of a cover body composed of a cover upper plate and a cover side plate and a ground spring, does not open a hole in the cover upper plate of the cover body, and has a good electromagnetic shielding effect. Obtainable.

Furthermore, according to the present invention, the cover main body composed of the cover upper plate and the cover side plate and the ground spring are integrated, the filter does not have a hole in the cover upper plate of the cover main body , and the electromagnetic shielding effect is good. The cover can be mounted on the circuit board.

Further, according to the present invention, the cover main body composed of the cover upper plate and the cover side plate and the ground spring are integrated, the filter does not have a hole in the cover upper plate of the cover main body , and the electromagnetic shielding effect is good. An antenna device having a cover can be obtained.

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

  With reference to FIG. 7, a reception system 10 including an antenna device 20 according to an embodiment of the present invention will be described.

  The illustrated receiving system 10 includes an antenna device 20 on which a satellite radio tuner 60 is mounted, and a head unit 30 that is not equipped with a tuner, which is an external device. The antenna device 20 and the head unit 30 that is not equipped with a tuner have a serial bus cable 40. Connected through. The antenna device 20 has an antenna element 21.

  Referring to FIG. 8 in addition to FIG. 7, the satellite radio tuner 60 mounted on the antenna device 20 includes a satellite radio tuner unit 61, a demodulation unit 62, an interface unit 63, and a CPU 64.

  The satellite radio tuner unit 61 converts a received signal (a high frequency signal of about 2.3 GHz band) received by the antenna element 21 into a frequency conversion unit (later described) having a frequency lower than the frequency of the received signal. Will be described in detail). Specifically, this frequency conversion signal is an intermediate frequency (IF) signal, and is a signal having a frequency in the 23 MHz band. The frequency conversion signal is converted into an audio signal by the demodulation unit 62 and supplied to the interface unit 63. The interface unit 63 converts the audio signal into an output signal for sending to the head unit 30 that is an external device. The interface unit 63 functions as an audio / serial conversion unit that converts an audio signal into a serial signal. The serial signal is sent to the head unit 30 via the serial bus cable 40. The CPU 64 controls the demodulation unit 62 and the interface unit 63.

  On the other hand, the head unit 30 includes an interface unit 31 that receives a serial signal transmitted from the antenna device 20 via the serial bus cable 40. The interface unit 31 functions as a serial / audio conversion unit that converts the received serial signal into an audio signal.

  Thus, in this receiving system, the audio signal is converted into a serial signal on the antenna device 20 side, and the serial signal is converted again into an audio signal on the head unit 30 side.

  According to such a configuration, the user can purchase the satellite radio compatible head unit 30 at low cost. Then, after deciding to view the satellite radio broadcast, the user can easily view the satellite radio broadcast by purchasing the antenna device 20. In addition, since data is exchanged between the antenna device 20 and the head unit 30 via the serial bus cable 40, there is no need to consider the loss of gain of the conventional RF coaxial cable 40A. Therefore, the length of the serial bus cable 40 can be increased.

  Next, the configuration of the antenna device 20 will be described with reference to FIGS. 9 to 12. The illustrated antenna device 20 is a planar antenna. The antenna device 20 includes a planar antenna element 21 made of a rectangular metal plate. A circuit board 23 is disposed in parallel to the planar antenna element 21 and at a predetermined interval. The circuit board 23 has an upper surface (first main surface) 23a and a back surface (second main surface) 23b facing each other. A ground pattern is formed on the upper surface of the circuit board 23. A feeding conductor 24 is disposed between the planar antenna element 21 and the circuit board 23.

  Referring to FIG. 13, on the back surface (bottom surface) 23b of the circuit board 23, various electronic components including the above-described satellite radio tuner unit 61, demodulation unit 62, interface unit 63, and CPU 64 are arranged. The demodulator 62 is composed of a baseband IC. The interface unit 63 is composed of an interface chip.

  The satellite radio tuner unit 61 includes a low noise amplifier (LNA) 22, a tuner IC 611, a local oscillator 612, and a SAW filter 100. The low noise amplifier 22 amplifies a reception signal (a high frequency signal of about 2.3 GHz band) received by the antenna element 21. The tuner IC 611, the local oscillator 612, and the SAW filter 100 are frequency converters that convert the output signal of the low noise amplifier 22 into a frequency conversion signal (an intermediate frequency signal in the 23 MHz band) having a lower frequency than the output signal. Parts. The frequency of the frequency conversion signal is determined by the frequency of the output signal of the low noise amplifier 22 and the local oscillation frequency of the local oscillator 612. The SAW filter 100 is a filter that passes the frequency conversion signal.

  Referring to FIG. 14, on the back surface (second main surface) 23b of circuit board 23, filter cover 110 for electromagnetic shielding of SAW filter 100 (FIG. 13) is mounted.

  Referring to FIG. 15, the filter cover 110 includes a cover upper plate 111 that covers an upper portion of the filter 100 (FIG. 13), and at least three cover side plates 1121, 1122, and 1123 that cover at least three sides of the filter 110. The filter cover 110 is grounded by extending from the end of the cover upper plate 111 to the upper side of the cover upper plate 111 and making contact with the outer shield cover (25 in FIGS. 9, 11, and 12). It has the shape which has the earth leaf | plate spring 113 which carries out.

  The external shield cover (25 in FIGS. 9, 11, and 12) is placed on the back surface (second main surface) 23b of the circuit board 23, and the satellite radio tuner unit (including the frequency conversion unit) 61 in FIG. It is mounted so as to cover the demodulation unit 62, the interface unit 63, and the filter cover 110, and an electromagnetic shield of the satellite radio tuner unit (including the frequency conversion unit) 61, the demodulation unit 62, the interface unit 63, and the filter cover 110 is provided. To do.

  Referring to FIG. 16, when mounting the filter cover 110 on the back surface (second main surface) 23b of the circuit board 23, a flat cover 110 'is first prepared. The flat cover 110 ′ includes an upper plate portion 111 ′ to be a cover upper plate, side plate portions 1121 ′, 1122 ′, and 1123 ′ to be cover side plates of at least three surfaces, and a plate spring to be a ground leaf spring. Part 113 '. Next, the flat cover 110 ′ is bent into the above shape to obtain the filter cover 110. At this time, the filter cover 110 is bent so that the leaf spring portion 113 ′ extends above the upper plate portion 111 ′ with respect to the upper plate portion 111 ′, and the side plate portions 1121 ′, 1122 ′, and 1123 ′ are formed. The upper plate portion 111 ′ is formed by being bent on the back side of the upper plate portion 111 ′ so as to be orthogonal to the upper plate portion 111 ′.

  Next, as shown in FIG. 17, the filter cover 110 is mounted on the back surface (second main surface) 23 b of the circuit board 23 in a state where the flat cover 110 ′ is bent into the above shape. In the illustrated example, three bottom portions of the filter cover 110 are mounted on the back surface 23 b of the circuit board 23 using the solder 120.

  In this way, in FIG. 17, the filter cover 110 of FIG. 15 is mounted on the back surface 23 b of the circuit board 23 using the solder 120.

  Here, in FIG. 17, instead of the filter cover 110 of FIG. 15, the filter cover 110 having another shape of FIG. 18 may be mounted on the back surface 23 b of the circuit board 23 using the solder 120. Hereinafter, the filter cover 110 having another shape of FIG. 18 will be described.

  In FIG. 18, the filter cover 110 includes a cover upper plate 111 that covers the upper portion of the filter 100 (FIG. 13), four cover side plates 1121, 1122, 1123, and 1124 that cover the sides of the filter 110, and a cover upper plate. An earth plate that extends from the end of 111 to above the cover upper plate 111 and contacts the outer shield cover (25 in FIGS. 9, 11, and 12) to ground the filter cover 110. It has a shape having a spring 113.

  Referring to FIG. 19, when mounting the filter cover 110 on the back surface (second main surface) 23b of the circuit board 23, a flat cover 110 'is first prepared. The flat cover 110 ′ should be an upper plate portion 111 ′ to be a cover upper plate, side plate portions 1121 ′, 1122 ′, 1123 ′, 1124 ′ to be cover side plates of four surfaces, and a ground leaf spring. And a leaf spring portion 113 '. Next, the flat cover 110 ′ is bent into the above shape to obtain the filter cover 110. At this time, the filter cover 110 is bent so that the leaf spring portion 113 ′ extends above the upper plate portion 111 ′ with respect to the upper plate portion 111 ′, and the side plate portions 1121 ′, 1122 ′, and 1123 ′ are formed. It is bent to the back side of the upper plate portion 111 ′ so as to be orthogonal to the upper plate portion 111 ′, and the side plate portion 1124 ′ is orthogonal to the side plate portions 1122 ′, 1123 ′, and the upper plate portion 111 ′. Are bent and formed so as to be orthogonal to each other.

  Returning to FIG. 9, these various electronic components are covered with a metal cover for electromagnetic shielding (for example, an outer shield cover made of aluminum die casting) 25. Each component described above is housed in a case formed by the upper case 26 and the lower case 27. Reference numeral 28 denotes packing, and reference numeral 29 denotes a cable and a bushing.

  Returning to FIG. 12, the upper case 26 and the antenna element 21 are positioned by the four protrusions 261 that protrude integrally with the upper case 26. The antenna element 21 is fixed to the upper case 26 by welding the tip of the protrusion 261.

  The circuit board 23 is screwed to four protrusions 262 that are integrally provided on the upper case 26 so that the distance in the height direction from the antenna element 21 is positioned.

  The packing 28 is provided with a groove 281 in an annular shape. The upper case 26 is provided with a wall portion 263 that is integrally formed and protrudes annularly around the antenna unit. The packing 28 is attached by inserting the wall portion 263 of the upper case 26 into the groove 281, and is crushed between the wall portion 271 formed integrally with the inner wall of the lower case 27 to form a waterproof structure.

  Eight columnar members 264 are integrally provided around the wall portion 263 of the upper case 26. The lower case 27 is also provided with columnar members 272 at positions corresponding to these columnar members 264. The upper case 26 and the lower case 27 are fixed by screwing both the columnar members 264 and 272.

  The wall portion 271 of the lower case 27 is formed with a U-shaped notch 271a into which the cable and the bushing of the bushing 29 are press-fitted. The bushing of the cable and bushing 29 has a U-shaped groove 291 into which the notch 271a portion of the lower case 27 is inserted. And the packing 28 is crushed by the upper surface of this bushing, and it is set as the waterproof structure.

  Although the present invention has been described above with reference to preferred embodiments, it is needless to say that the present invention is not limited to the above-described embodiments. The antenna device according to the present invention can be used in a wide range of fields such as in-vehicle appliances, household appliances, portable devices, game machines, personal computers, and the like. In addition, by using a display controller, satellite radio broadcasts can be viewed even on devices that do not support satellite radio.

It is a block diagram which shows a 1st conventional receiving system. It is a block diagram which shows the 2nd conventional receiving system. It is a 4th page figure of the cover main part of the 1st conventional filter cover. It is a 3rd page figure of the ground spring of the 1st conventional filter cover. It is a 3rd page figure of the 1st conventional filter cover. It is a 5th page figure of the 2nd conventional filter cover. It is a block diagram which shows the receiving system provided with the antenna device which concerns on one embodiment of this invention. It is a block diagram which shows the structure of the antenna apparatus used for the receiving system shown by FIG. It is a disassembled perspective view of the antenna apparatus used for the receiving system shown by FIG. FIG. 10 is an assembled perspective view showing the antenna device shown in FIG. 9 with the upper case removed. FIG. 10 is an assembled perspective view showing the antenna device shown in FIG. 9 with a lower case removed. FIG. 10 is a cross-sectional view of the antenna device shown in FIG. 9. It is a top view which shows the various electronic components mounted in the back surface of the circuit board used for the antenna apparatus shown by FIG. 9 in the state before filter cover mounting. It is a top view which shows the various electronic components mounted in the back surface of the circuit board used for the antenna apparatus shown by FIG. 9 in the state after filter cover mounting. FIG. 15 is a five-side view of the filter cover shown in FIG. 14. FIG. 16 is a development view of the filter cover shown in FIG. 15. FIG. 16 is a two-side view illustrating a mounting state of the filter cover illustrated in FIG. 15 on the back surface of the circuit board. FIG. 15 is a five-side view of another filter cover mounted on a circuit board instead of the filter cover shown in FIG. 14. FIG. 19 is a development view of the filter cover shown in FIG. 18.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Reception system 20 Antenna apparatus 21 Antenna element 22 Low noise amplifier (LNA)
23 Circuit board 23a Upper surface (first main surface)
23b Back surface (second main surface)
24 Feeder conductor 25 Metal cover 26 Upper case 27 Lower case 30 Head unit (external device)
31 Interface section (serial / voice conversion section)
40 serial bus cable 60 satellite radio tuner 61 tuner section 62 demodulation section 63 interface section (voice / serial conversion section)
64 CPU
100 SAW filter 110 Filter cover 111 Cover upper plate 1121, 1122, 1123, 1124 Cover side plate 113 Ground leaf spring 111 'Upper plate portion 1121', 1122 ', 1123', 1124 'Side plate portion 113' Leaf spring portion

Claims (9)

A method of mounting a filter cover for electromagnetic shielding of a filter mounted on a main surface of a circuit board on the main surface,
The filter cover covers the upper portion of the filter, a cover upper plate which is not holed, and a cover plate of at least three sides covering at least part of the side of the filter, from said end portion of said cover upper plate Extending along the upper surface of the cover upper plate toward the opposite end of the cover upper plate and contacting the plate surface of the plate-like outer shield cover parallel to the main surface, the filter cover In the filter cover mounting method having a shape having a ground leaf spring for grounding,
A flat cover having an upper plate portion having no holes, to be the cover upper plate, a side plate portion to be the cover side plate of the at least three surfaces, and a plate spring portion to be the ground leaf spring; Steps to prepare,
Bending the flat cover into the shape to obtain the filter cover;
In the state where the flat cover is folded into the shape, the cover upper plate covers the upper portion of the filter, and the at least three cover side plates cover the side of the filter. And a method of mounting the filter cover on the main surface. A method of mounting a filter cover for electromagnetic shielding of a filter mounted on a main surface of a circuit board on the main surface,
The filter cover includes a cover upper plate that does not have a hole covering the upper portion of the filter, a four-side cover side plate that covers a side portion of the filter, and an end of the cover upper plate that faces the cover upper plate. An earth for grounding the filter cover by extending along the upper surface of the cover upper plate toward the end and contacting the plate surface of the plate-like outer shield cover parallel to the main surface. In the filter cover mounting method having a shape having a leaf spring,
A flat cover having an upper plate portion having no holes, to be the cover upper plate, a side plate portion to be the four-side cover side plate, and a leaf spring portion to be the ground leaf spring; Steps to prepare,
Bending the flat cover into the shape to obtain the filter cover;
In the state where the filter cover is folded in the shape of the flat cover, the cover upper plate covers the upper portion of the filter, and the four cover side plates cover the side portions of the filter. Mounting the filter cover on the main surface. In the filter cover mounting method according to claim 1 or 2 ,
The filter cover mounting method, wherein the filter is a SAW (Surface Acoustic Wave) filter. An antenna unit that receives a satellite wave or a terrestrial wave and outputs a reception signal; and when the reception signal is converted into a frequency conversion signal having a frequency lower than the frequency of the reception signal, the frequency conversion signal is passed through. A filter used in the above, a demodulator that converts the frequency-converted signal into an audio signal, and a circuit board having first and second main surfaces facing each other,
The antenna unit is mounted on the first main surface,
The filter and the demodulation unit are antenna devices mounted on the second main surface,
The antenna device is mounted on the second main surface and mounted so as to cover the demodulator and the filter cover on the second main surface, and a filter cover for electromagnetically shielding the filter. And an outer shield cover for performing electromagnetic shielding between the demodulator and the filter cover ,
The filter cover covers the upper portion of the filter, a cover upper plate which is not holed, and a cover plate of at least three sides covering at least part of the side of the filter, from said end portion of said cover upper plate By extending along the upper surface of the cover upper plate toward the opposite end of the cover upper plate and contacting the plate surface of the plate-like outer shield cover parallel to the second main surface, And having a shape having a ground leaf spring for grounding the filter cover,
The filter cover includes, in advance, an upper plate portion having no holes, which is to be the cover upper plate, a side plate portion to be the cover side plate of the at least three surfaces, and a leaf spring portion to be the ground leaf spring. An antenna device, wherein a flat cover having a shape is mounted on the second main surface in a state where the cover is bent into the above-mentioned shape. An antenna unit that receives a satellite wave or a terrestrial wave and outputs a reception signal; and when the reception signal is converted into a frequency conversion signal having a frequency lower than the frequency of the reception signal, the frequency conversion signal is passed through. A filter used in the above, a demodulator that converts the frequency-converted signal into an audio signal, and a circuit board having first and second main surfaces facing each other,
The antenna unit is mounted on the first main surface,
The filter and the demodulation unit are antenna devices mounted on the second main surface,
The antenna device is mounted on the second main surface and mounted so as to cover the demodulator and the filter cover on the second main surface, and a filter cover for electromagnetically shielding the filter. And an outer shield cover for performing electromagnetic shielding between the demodulator and the filter cover ,
The filter cover includes a cover upper plate that does not have a hole covering the upper portion of the filter, a four-side cover side plate that covers a side portion of the filter, and an end of the cover upper plate that faces the cover upper plate. The filter cover is grounded by extending along the upper surface of the cover upper plate toward the end and in contact with the plate surface of the plate-like outer shield cover parallel to the second main surface. Having a shape with a grounding leaf spring to remove,
The filter cover includes, in advance, an upper plate portion that does not have a hole to be the cover upper plate, a side plate portion that is to be the cover side plate of the four surfaces, and a leaf spring portion that is to be the ground leaf spring. An antenna device, wherein a flat cover having a flat plate shape is mounted on the second main surface in a state where the cover is bent into the shape. An antenna unit that receives a satellite wave or a ground wave and outputs a reception signal, a frequency conversion unit that converts the reception signal into a frequency conversion signal having a frequency lower than the frequency of the reception signal, and the frequency conversion signal as audio A demodulator for converting the signal, an interface unit for converting the audio signal into an output signal for sending to an external device, and a circuit board having first and second main surfaces facing each other,
The frequency conversion unit includes a filter that passes the frequency conversion signal,
The antenna unit is mounted on the first main surface,
The frequency conversion unit, the demodulation unit, the interface unit, and the filter are antenna devices mounted on the second main surface,
The antenna device is mounted on the second main surface, and a filter cover for electromagnetically shielding the filter; on the second main surface, the frequency converter, the demodulator, the interface, and the interface An outer shield cover that is mounted so as to cover the filter cover, and that electromagnetically shields the frequency conversion unit, the demodulation unit, the interface unit, and the filter cover;
The filter cover covers the upper portion of the filter, a cover upper plate which is not holed, and a cover plate of at least three sides covering at least part of the side of the filter, from said end portion of said cover upper plate By extending along the upper surface of the cover upper plate toward the opposite end of the cover upper plate and contacting the plate surface of the plate-like outer shield cover parallel to the second main surface , And having a shape having a ground leaf spring for grounding the filter cover,
The filter cover includes, in advance, an upper plate portion having no holes, which is to be the cover upper plate, a side plate portion to be the cover side plate of the at least three surfaces, and a leaf spring portion to be the ground leaf spring. An antenna device, wherein a flat cover having a shape is mounted on the second main surface in a state where the cover is bent into the above-mentioned shape. An antenna unit that receives a satellite wave or a ground wave and outputs a reception signal, a frequency conversion unit that converts the reception signal into a frequency conversion signal having a frequency lower than the frequency of the reception signal, and the frequency conversion signal as audio A demodulator for converting the signal, an interface unit for converting the audio signal into an output signal for sending to an external device, and a circuit board having first and second main surfaces facing each other,
The frequency conversion unit includes a filter that passes the frequency conversion signal,
The antenna unit is mounted on the first main surface,
The frequency conversion unit, the demodulation unit, the interface unit, and the filter are antenna devices mounted on the second main surface,
The antenna device is mounted on the second main surface, and a filter cover for electromagnetically shielding the filter; on the second main surface, the frequency converter, the demodulator, the interface, and the interface An outer shield cover that is mounted so as to cover the filter cover, and that electromagnetically shields the frequency conversion unit, the demodulation unit, the interface unit, and the filter cover;
The filter cover includes a cover upper plate that does not have a hole covering the upper portion of the filter, a four-side cover side plate that covers a side portion of the filter, and an end of the cover upper plate that faces the cover upper plate. The filter cover is grounded by extending along the upper surface of the cover upper plate toward the end and in contact with the plate surface of the plate-like outer shield cover parallel to the second main surface. Having a shape with a grounding leaf spring to remove,
The filter cover includes, in advance, an upper plate portion that does not have a hole to be the cover upper plate, a side plate portion that is to be the cover side plate of the four surfaces, and a leaf spring portion that is to be the ground leaf spring. An antenna device, wherein a flat cover having a flat plate shape is mounted on the second main surface in a state where the cover is bent into the shape. The antenna device according to any one of claims 4 to 7 ,
The antenna device according to claim 1, wherein the filter is a SAW (Surface Acoustic Wave) filter. The antenna device according to claim 6, wherein
The antenna device further includes an amplifier that is mounted on the second main surface and that gives the frequency conversion unit in a state where the reception signal is amplified,
The antenna device according to claim 1, wherein the filter cover is mounted on the second main surface so that the at least three cover side plates cover at least a side portion of the filter closest to the amplifier.

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