JP3987419B2 - Speaker integrated antenna, speaker integrated antenna mounting structure, electronic device, and speaker integrated antenna mounting method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker integrated antenna that can be used in electronic devices such as a mobile phone, a portable information terminal, a portable audio device, and a portable AV player equipped with a wireless communication function and a sound output function, and a mounting structure of the speaker integrated antenna. The present invention relates to a mounting method of an electronic device and a speaker integrated antenna.
[0002]
[Prior art]
In an electronic device equipped with a conventional wireless communication function and sound output function, both an antenna for transmitting and receiving radio communication radio waves and a speaker for sound output are separately mounted.
Patent Document 1 discloses an antenna / speaker device in which an antenna element is mounted on an electrically insulating vibrating body.
[0003]
[Patent Document 1]
JP 2001-217633 A (FIG. 1)
[0004]
[Problems to be solved by the invention]
Such electronic devices such as mobile phones having a conventional antenna and speaker or receiver have the following problems.
Since both the speaker and the antenna have a function of outputting radio waves or sound waves to the space, it is necessary to mount them in a specific part of the device to ensure the characteristics. However, in a portable small electronic device, the mounting part is limited in consideration of the display part, the operation part, and the place that is not blocked by hand in use. ,was difficult. For this reason, it was necessary to mount at the expense of performance, or to increase the size of the device.
[0005]
Since the speaker serving as an antenna described in Patent Document 1 uses a vibrating body surface of a speaker having a vibrating body with an insulating structure as an antenna substrate, the vibrating body needs to be insulative. In addition, since the antenna element has a structure that vibrates together with an acoustic signal, this speaker is mounted on the plane of the speaker diaphragm so that radio waves from the antenna element are transmitted and received in both the front and rear directions of the speaker vibration direction. Will be. Therefore, when mounted on a portable small electronic device, even if a metal approaches either the front or the back of the antenna, transmission / reception of the antenna is hindered and the antenna characteristics deteriorate. Could not be placed.
[0006]
There is also a problem that a metal net or a protective plate cannot be used to protect the diaphragm. Because metal nets and protective plates cannot be used, protection with an insulating protective plate that has the same strength as metal, or a strong non-metallic diaphragm is required to eliminate the need for a protective plate The cost and size were rising.
[0007]
Furthermore, since the antenna element moves with an acoustic signal, in communication using a high frequency or broadband communication using a high-speed digital signal, the center frequency of the antenna is shifted and the antenna gain is reduced. There is also a concern that wireless communication may be disturbed due to a fading change.
[0008]
Development issues with concurrent engineering have also arisen. The characteristics of the antenna greatly affect the situation of the main board. Therefore, it is necessary to adjust by providing a matching circuit on the main board or changing the wiring length for feeding the antenna. In concurrent engineering, both the main board and the antenna board are developed in parallel. Usually, the main board is larger and difficult to change, which may affect the entire device development schedule.
[0009]
The present invention has been made in view of such a problem, and it is possible to reduce the size of a device while maintaining the performance required by both the speaker and the antenna while maintaining the performance of both. It is an object of the present invention to provide a speaker integrated antenna, a speaker integrated antenna mounting structure, an electronic device, and a speaker integrated antenna mounting method.
[0010]
In addition, the present invention is a speaker integrated antenna, a mounting structure of the speaker integrated antenna, which can use a metal part to protect the diaphragm and the diaphragm, can ensure reliability and reduce costs, and can support concurrent engineering, It is an object of the present invention to provide a mounting method for an electronic device and a speaker integrated antenna.
[0011]
[Means for Solving the Problems]
The speaker-integrated antenna of the present invention has a flat conductor formed on one surface and a printed circuit board on which at least the speaker is mounted on the other surface, and a predetermined distance from the printed circuit board. a main substrate having a body, said comprising a conductor of the printed circuit board and a connector in which the connecting the conductor of the main board electrically, the conductor of the printed circuit board, conductor and the connector of the main board antenna It is characterized in that the element part of is constructed.
[0012]
The printed circuit board is plate-shaped conductor is formed on the surface, it is preferred electronic component on the rear surface can be implemented.
[0013]
The connector serves also as the antenna feed connector and the speaker power supply connector.
[0014]
Furthermore, an antenna matching circuit may be mounted on the back surface of the printed board or the main board.
Furthermore, an antenna transmission / reception frequency changing circuit may be mounted on the back surface of the printed circuit board or the main circuit board.
Furthermore, a speaker amplifier circuit may be mounted on the back surface of the printed board or the main board.
Furthermore, the printed circuit board, mounted acoustic transducer elements, said printed circuit board may be one that vibrates as an acoustic diaphragm.
[0016]
The electronic device of the present invention, an electronic apparatus having an antenna and a speaker, to form a flat conductor on one surface, a printed board mounted with at least a speaker on the other side, the printed circuit board with a predetermined distance They are spaced apart, comprising: a main substrate having a flat conductor and a connector for electrically connecting a conductor of the main substrate and the conductor of the printed circuit board, conductor of said printed circuit board, the main A speaker integrated antenna in which the conductor of the substrate and the connector constitute an element portion of the antenna is mounted as an antenna and a speaker.
[0017]
Moreover, implementation of a speaker integrated antenna of the present invention forms a flat conductor on one surface, a printed board mounted with at least a speaker on the other side, in parallel away the printed circuit board with a predetermined distance is arranged, a main substrate having a flat conductor, and a connector for electrically connecting a conductor of the main substrate and the conductor of the printed circuit board, conductor of said printed circuit board, the main board A method of mounting a speaker-integrated antenna in which a conductor and the connector constitute an element part of an antenna, wherein the speaker includes a speaker unit having a speaker terminal, and the speaker unit is mounted on the back surface of the printed circuit board. At the same time, it is characterized by being integrated with the printed circuit board by reflow soldering.
Further, the flat conductor of the printed board is formed by printing, painting, or pasting a conductive material such as metal.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a speaker integrated antenna, a speaker integrated antenna mounting structure, an electronic apparatus, and a speaker integrated antenna mounting method according to the present invention will be described in detail with reference to the accompanying drawings.
[0019]
1 to 3 are diagrams showing the configuration of a speaker integrated antenna according to an embodiment of the present invention. FIG. 1 is a side view thereof, FIG. 2 is an exploded perspective view showing the assembly process, and FIG. It is a perspective view of the antenna substrate. FIG. 4 is a circuit diagram of an electronic device on which the speaker integrated antenna is mounted, and FIG. 5 is a perspective view showing an appearance of a portable information terminal mounted with the speaker integrated antenna.
This is an example in which the present invention is applied to a portable information terminal such as a PDA (Personal Digital Assistants) as an electronic device on which the speaker integrated antenna is mounted.
[0020]
First, in FIG. 5, reference numeral 1 denotes a portable information terminal (electronic device). The portable information terminal 1 main body 1 a receives information such as a speaker-integrated antenna 10, guidance and reception information for operation, image and text information. The keyboard 3 is composed of an LCD display unit 2 to be displayed, function keys for switching functions, determining operations, cursor keys for moving a selection target in the vertical and horizontal directions, and alphanumeric keys.
[0021]
The upper part of the main body 1a of the portable information terminal 1 is a speaker / antenna area 4 that accommodates a speaker-integrated antenna, the central part of the main body 1a is a display area 5 that includes an LCD display 2 and the like, and the lower part of the main body 1a is an operation that includes a keyboard 3 and the like. Area 6.
[0022]
Since both the speaker and the antenna have a function of outputting radio waves or sound waves to the space, it is necessary to mount them in a specific part of the device to ensure the characteristics. Further, when using the LCD display unit 2 or the keyboard 3, it is necessary to consider a place that is not blocked by the hand. Therefore, in the present embodiment, as shown in FIG. 5, both the speaker and the antenna are mounted on the speaker / antenna area 4 above the main body 1a and away from the display area 5 and the operation area 6. To do. Since the size of the speaker / antenna area 4 greatly affects the overall size of the electronic apparatus 1, it is preferable to make it as small as possible.
[0023]
1 to 3, reference numeral 10 denotes a speaker integrated antenna, 11 denotes an antenna substrate 11 of the speaker integrated antenna 10, and 12 denotes a speaker unit 12 mounted on the antenna substrate 11.
[0024]
As shown in FIG. 1, the antenna substrate 11 is connected to the main substrate 15 via the power supply connector 13 and the GND connector 14. As shown in FIG. 1, the antenna substrate 11 is composed of a solid surface GNDa 11a (conductor of the antenna substrate) on the entire surface (one surface) and a signal component surface 11b on the back surface (the other surface) (see FIG. 1). 3).
As shown in the cross-sectional view of FIG. 1, the main substrate 15 has a three-layer structure having an entire surface solid GND surface 15a (conductor of the main substrate) on the inner layer.
[0025]
Thus, the antenna substrate 11 and the main substrate 15 are separated and arranged in parallel, and the entire solid GND surface 11a of the antenna substrate 11 is connected to the main substrate via the power supply connector 13 and the GND connector 14 having a predetermined line length. 15 is connected to the entire solid GND surface 15a of the inner layer. Therefore, as shown in the side view of FIG. 1, the metal conductor portion from the entire solid GND surface 11 a of the antenna substrate 11 to the entire solid GND surface 15 a of the inner layer of the main substrate 15 through the power supply connector 13 and the GND connector 14 is a plate. An element portion 20 of a metal antenna such as a plate-like inverted F antenna or a plate-like inverted L antenna is configured. Here, the plate shape indicates that the metal antenna portion of the entire solid GND surface 11a of the antenna substrate 11 or the entire solid GND surface 15a of the main substrate 15 is plate-shaped, and the reverse F or the reverse L Indicates that the metal antenna element 20 is in an inverted F shape or an inverted L shape when viewed from the side.
[0026]
The speaker unit 12 is mounted on the antenna substrate 11, and an audio signal is supplied from the main substrate 15 through the power supply connector 13 and the GND connector 14. As shown in FIG. 3, a speaker sound hole 16 is formed in the antenna substrate 11, and a speaker pad 17 and a chip capacitor 18 are attached to the signal component surface 11 b of the antenna substrate 11. A through hole 19 is formed between the signal component surface 11b of the antenna substrate 11 and the entire solid GND surface 11a. The speaker unit 12 is installed facing the speaker sound hole 16 and is connected to the speaker pad 17 to be supplied with power. The speaker pad 17 is divided into two according to the speaker terminal, one speaker pad 17 is connected to the power supply connector 13, and the other speaker pad 17 is formed on the entire solid GND surface 11 a through the through hole 19. Connected. The above-described configuration constitutes a power supply separation circuit 17A for supplying antenna power supply and speaker power supply by a single line.
As described above, the speaker unit 12 is mounted on the metal antenna element portion 20 such as a plate-like inverted F antenna or a plate-like inverted L antenna.
[0027]
Further, by realizing the antenna element portion 20 with a printed circuit board including the antenna substrate 11 and the main substrate 15, a power supply separation circuit 17A for supplying antenna power supply and speaker power supply with one line can be mounted, A connector for connecting to the substrate 15 is mounted. That is, a printed circuit board on which a power supply separation circuit 17A for supplying antenna power supply and speaker power supply with a single line (power supply connector 13) is used as the metal antenna element portion 20 and connected to the main board 15. Therefore, the printed circuit board on which the GND connector 14 is mounted is used as the metal antenna element portion 20.
FIG. 4 shows a circuit example of the antenna and speaker unit of the portable information terminal on which the speaker integrated antenna 10 is mounted.
[0028]
In FIG. 4, the main board 15 includes a resonance circuit 22 including an RF unit 21, inductors L1 and L2, and a capacitor C1, an audio amplifier 23 including an audio power IC that amplifies an audio signal, and capacitors C2 and C3. Is done. The main board 15 is connected to the antenna board 11 through the power supply connector 13 and the GNG connector 14. The antenna board 11 is characterized in that the speaker integrated antenna 10 antenna element portion is realized by a printed board as described above, and electrically includes an antenna 31 connected via the power supply connector 13 and the capacitor 18; The speaker 32 is connected between the power supply connector 13 and the GNG connector 14.
Hereinafter, the operation of the speaker-integrated antenna 10 configured as described above will be described.
[0029]
First, antenna operation will be described. A high-frequency signal fed from the power supply connector 13 to the signal component surface 11 b passes through the high-frequency capacitor 18 and is connected to the entire solid GND surface 11 a of the antenna substrate 11 through the through hole 19. Further, the GND signal is routed from the connection point to the vicinity of the main board side of the power supply connector 13 via the GND connector 14 and further through the main board inner layer solid GND 15a. As a result, an electric field is generated between the antenna substrate 11 and the sub-substrate, and the antenna operates as an antenna from which electromagnetic waves are emitted into space. Also, reception is the same operation in the opposite manner.
[0030]
Next, the speaker operation will be described. The power supply connector 13 is connected to the speaker unit 12, and the opposite terminal of the speaker unit 12 is directly connected to the antenna substrate 11 as GND. Since the audio signal has a sufficiently lower frequency than the high-frequency signal, it acts as a GND regardless of where it is connected on the entire solid GND surface 11a of the antenna substrate 11 that is the antenna element portion.
Next, the assembly of the antenna substrate 11 will be described with reference to the assembly diagram of FIG. 2 and the antenna substrate diagram of FIG.
[0031]
As shown in FIG. 3, the antenna substrate 11 has a speaker sound hole 16, and is supplied with power through a speaker pad 17. Soldering is performed by printing a solder paste for reflow on the pads, mounting the speaker unit 12 on the signal component surface 11b of the antenna substrate 11 by automatic mounting, as shown in FIG. Is done. At this time, the chip capacitor 18, the power supply connector 13, and the GND connector 14 are simultaneously mounted on the same surface, whereby the speaker integrated antenna 10 is completed.
[0032]
As shown in FIG. 2, the main board 15 and the antenna board 11 are mounted on the main board 15 by the power feeding connector 13.
The operation of the portable information terminal on which the speaker integrated antenna 10 is mounted will be described.
[0033]
As shown in FIG. 4, the signals output from the RF unit 21 and the audio amplifier 23 are synthesized by capacitors C1, C2, C3 and inductors L1, L2, respectively. Since these signal frequencies are significantly different, the audio signal can be simply cut with a capacitor and the high-frequency signal can be cut with an inductor. However, even if the high-frequency signal is sufficiently cut by the inductor on the audio side, the high-frequency GND potential differs, so that the high-frequency signal wraps around the input / output of the audio amplifier 23. At this time, since the transmission wave of the RF unit 21 is output and burst noise is generated due to the timing at which the output stops, capacitors C2 and C3 for taking high-frequency GND sufficiently before and after the audio amplifier 23 are necessary.
[0034]
The high frequency and audio signals synthesized as described above are fed to the antenna substrate 11 by the same feeding connector 13. The antenna side is fed via a capacitor 18. This is necessary so that the low-frequency component of the audio signal does not short to GND due to antenna feeding. Depending on the speaker, the audio line may affect the antenna. In this case, it is necessary to insert the inductor L3 in series in the speaker line.
[0035]
As described above, the speaker-integrated antenna 10 according to the present embodiment includes the antenna substrate 11 in which the entire solid GND surface 11a is formed on the front surface and the speaker unit 12 is mounted on the signal component surface 11b on the back surface, and the antenna substrate. 11, a main substrate 15 having a full solid GND surface 15a disposed in parallel with a predetermined distance, and a full solid GND surface 11a of the antenna substrate 11 and a full solid GND surface 15a of the main substrate 15 having a predetermined line length. Since the entire solid GND surface 11a of the antenna substrate 11, the entire solid GND surface 15a of the main substrate 15 and the GND connector 14 constitute the antenna element portion 20, the main power supply connector 13 and the GND connector 14 are connected. In an electronic apparatus having a substrate 15 and a metal antenna and speaker having a separation structure, The element portion 20 of the metal antenna such antennas and planar inverted-L antenna can implement a speaker unit 12, while securing the back volume of the speaker, it is possible to secure the antenna volume.
[0036]
In order to ensure the performance of the antenna and the speaker, a certain amount of volume is required respectively. In the plate-like inverted F antenna, a high-frequency electric field is generated between the antenna and the main board 15 on which the inverted F antenna is mounted, and operates as an antenna. Therefore, the larger the volume due to the area of the inverted F antenna and the distance between the main substrates, the higher the gain and bandwidth, which are antenna performance.
[0037]
Further, since the speaker unit 12 is a part of the antenna element and the inverted F antenna operates using the portion of the main board 15 facing the inverted F antenna as an antenna, a structure that blocks antenna transmission / reception is used in principle. Will not occur.
In addition, as for the performance of the speaker, if the volume on the back side of the speaker is small, the diaphragm cannot sufficiently vibrate, so it is necessary to ensure the back volume of the diaphragm.
[0038]
Therefore, by using the exclusive volume of the inverted F antenna as both the antenna and the rear volume of the speaker, it is possible to integrate them while ensuring the necessary volumes of both.
[0039]
In the present embodiment, the antenna element portion 20 of the speaker integrated antenna 10 is realized by the antenna substrate 11 made of a printed circuit board, so that a power feeding separation circuit for supplying antenna power feeding and speaker power feeding with one line is mounted. Or a connector for connecting to the main board, an antenna matching circuit, an antenna transmission / reception frequency changing circuit, or a speaker amplifier circuit can be easily mounted.
[0040]
In addition, mass production is possible by using a mounting method in which the speaker unit 12 having speaker terminals corresponding to automatic mounting is mounted on the antenna substrate 11 (printed substrate) and soldered and integrated by reflow. Further, by mounting the mounting components of the antenna substrate 11 on the surface of the antenna substrate 11 facing the main substrate 15 side, these components are not exposed to the outside, so that useless space does not occur.
[0041]
In addition, since a matching circuit can be mounted on the antenna board 11, it is possible to proceed with the development of the antenna in parallel with the design and development of the main board 15, and it can be handled by changing the antenna side even at the final adjustment stage. It is.
[0042]
If the antenna element 20 can vibrate even if the antenna element 20 vibrates, an acoustic vibration element is directly mounted on the antenna element 20 (for example, the antenna substrate 11), and the antenna element 20 is acoustically connected. It can also be operated as a diaphragm. Even in this case, the volume required for the antenna and the speaker can be secured.
[0043]
As other embodiments, the antenna element part is not an board but an example in which the antenna part is formed of a metal part for protecting a diaphragm of the speaker, or the speaker unit 12 in FIG. 11 can be configured as an acoustic diaphragm. In this example as well, it is possible to have a structure in which the volume of the antenna and the volume of the back surface of the speaker are shared while the speaker and the antenna are integrally formed by arranging them parallel to the main board as in FIG.
[0044]
Note that the speaker integrated antenna according to the above embodiment is an example applied to a portable information terminal such as a PDA, but a mobile phone, a portable audio device, a portable AV player equipped with a wireless communication function and a sound output function. Needless to say, the present invention can be applied to various devices such as a wireless transceiver and a TV video circuit.
[0045]
In the above embodiment, the name of the speaker-integrated antenna is used. However, this is for convenience of explanation. For example, an antenna / speaker, an antenna system, an antenna manufacturing method, or the like may be used. It may be incorporated in the part.
[0046]
Furthermore, the shape of the speaker-integrated antenna may be any shape such as a plate-shaped inverted F antenna or a plate-shaped inverted L antenna, such as an RF unit, an amplifier, a power feeding separation circuit, or the like constituting the speaker-integrated antenna and the electronic device. The type and number are not limited to the above-described embodiment. The conductor is preferably a metal, but may be another conductive material.
[0047]
【The invention's effect】
As described above in detail, according to the present invention, a speaker-integrated antenna can be realized while securing the volume required by both the speaker and the antenna while maintaining the performance of both. The size of a device to which the antenna is applied can be reduced.
[0048]
At this time, compared with the conventional technique in which the antenna element is mounted on the diaphragm, the antenna is not vibrated by an acoustic signal because the antenna is fixed, and the high-frequency electric field between the antenna element and the main board is facing. Therefore, it is effective as an antenna for high-speed digital wireless communication that has nothing to block during antenna transmission / reception and requires higher frequency, wider bandwidth, and higher efficiency.
[0049]
In addition, by using metal parts to protect the diaphragm and diaphragm, or by automatically mounting a speaker, it is possible to ensure reliability and reduce costs by mass production.
Furthermore, main board development and antenna development can be separated, and in the situation where today's development speed is required, concurrent engineering can be supported.
[Brief description of the drawings]
FIG. 1 is a side view showing a configuration of a speaker-integrated antenna according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing an assembly process of the speaker-integrated antenna of the present embodiment.
FIG. 3 is a perspective view of an antenna substrate of the speaker integrated antenna according to the present embodiment.
FIG. 4 is a circuit diagram of an electronic device on which the speaker integrated antenna according to the present embodiment is mounted.
FIG. 5 is a perspective view showing an appearance of a portable information terminal on which the speaker integrated antenna according to the present embodiment is mounted.
[Explanation of symbols]
1 Portable information terminal (electronic equipment)
DESCRIPTION OF SYMBOLS 1a Main body 2 LCD display part 3 Keyboard 4 Speaker / antenna area 5 Display area 6 Operation area 10 Speaker integrated antenna 11 Antenna board 12 Speaker unit 13 Power supply connector 14 GND connector 11a Whole surface solid GND surface (conductor of antenna board)
11b Signal component surface 15 Main substrate 15a Whole solid GND surface (conductor of main substrate)
16 Speaker hole 17 Speaker pad 17A Feed separation circuit 18 Chip capacitor 19 Through hole 20 Element element portion 21 RF portion 22 Resonant circuit 23 Audio amplifier 31 Antenna 32 Speaker L1, L2, L3 Inductor C1, C2, C3 Capacitor

Claims (10)

Forming a plate-shaped conductor on one surface, a printed board mounted with at least a speaker on the other side,
A main board which is arranged at a predetermined distance from the printed board and has a flat conductor;
A connector for electrically connecting the conductor of the printed board and the conductor of the main board;
The speaker integrated antenna, wherein the conductor of the printed board, the conductor of the main board, and the connector constitute an element portion of the antenna. The printed circuit board, the surface plate-shaped conductors are formed in the speaker integrated antenna according to claim 1, the electronic component on the rear surface is characterized in that it is implemented. The connector according to claim 1 or 2 loudspeakers integrated antenna according to, characterized in that also serves the antenna feed connector and the speaker power supply connector. 3. The speaker integrated antenna according to claim 2 , further comprising an antenna matching circuit mounted on a back surface of the printed board or the main board. 3. The speaker integrated antenna according to claim 2 , further comprising an antenna transmission / reception frequency changing circuit mounted on a back surface of the printed circuit board or the main circuit board. 3. The speaker integrated antenna according to claim 2 , further comprising a speaker amplifier circuit mounted on a back surface of the printed board or the main board. Furthermore, the the printed circuit board, mounted acoustic transducer elements, the speaker integrated antenna according to claim 2, wherein said printed circuit board and wherein the vibrating as an acoustic diaphragm. In an electronic device having an antenna and a speaker,
A printed circuit board in which a flat conductor is formed on one surface and at least a speaker is mounted on the other surface;
A main board which is arranged at a predetermined distance from the printed board and has a flat conductor;
A connector for electrically connecting the conductor of the printed board and the conductor of the main board;
An electronic apparatus in which a speaker integrated antenna in which the conductor of the printed circuit board, the conductor of the main substrate, and the connector constitute an element portion of the antenna is mounted as an antenna and a speaker. A printed circuit board in which a flat conductor is formed on one surface and at least a speaker is mounted on the other surface;
A main board that is arranged in parallel with the printed circuit board at a predetermined distance and has a flat conductor;
A connector for electrically connecting the conductor of the printed board and the conductor of the main board;
A method for mounting a speaker-integrated antenna in which the conductor of the printed board, the conductor of the main board, and the connector constitute an element part of the antenna,
The speaker comprises a speaker unit having a speaker terminal,
A method for mounting a speaker-integrated antenna, wherein the speaker unit is mounted on a back surface of the printed circuit board, and is integrated with the printed circuit board by reflow soldering. The flat conductor of the printed circuit board is
The method for mounting a speaker-integrated antenna according to claim 9 , wherein a conductive material such as a metal is printed, formed by painting, or pasted.

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