JP2001217633A - Speaker system serving also as antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrate the antenna and speaker of radio equipment into one. SOLUTION: A substrate for an antenna is used in common, which comprises a flat plate type electric insulating vibrator with one or more driving devices, open loops and closed loops wired in plane along its surface, and branch lines.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a general radio communication device for transmitting an acoustic signal using a radio wave as a medium, such as a television receiver, an FM broadcast receiver, and a radio receiver, and more particularly to such a receiver.

[0002]

2. Description of the Related Art Conventionally, in a radio communication device for transmitting an acoustic signal using a radio wave as a medium, an antenna and a speaker or a receiver are included as essential components together with other articles. These may have speakers built into the communication equipment, for example, the television receiver itself,
It is often installed and connected independently as an external device. Most antennas are installed and connected as external devices of communication equipment.

[0003]

SUMMARY OF THE INVENTION The present invention eliminates the inconvenience of an installation place and the complicated handling which are caused by the configuration of a plurality of external devices of a communication apparatus main body as described above, and has an integrated function. Only one external device
It is intended to satisfy the essential functions of communication equipment.
Further, the external device can be used as a part of a display device for displaying a video, an image, and the like, and is intended to provide many conveniences.

[0004]

The present invention consists of independently realizing two functions and integrating them as a single unit. The first is a speaker having a flat vibrating body. 1, a schematic diagram is shown in FIG. 1. In FIG. 1, 11 is a vibrating body, 12 is a vibrating body driving device 1, 13 is a vibrating body driving device 2, 14 is a frame, and 15 is a connecting line 1.
FIG. 2 is a perspective view of the vibrating body driving devices 1 and 1 shown in FIG.
3 is a cross-sectional view showing the cylindrical structure of the vibrating body driving device 2. Numerals 12 and 13 have substantially the same structure, which is the same as a general dynamic speaker driving portion. Is a yoke, 23 is a voice coil 24, a connecting wire, 25 is a center pole, 26 is a center holding plate, and 27 is a drive contact. The vibrating body 11 in FIG. It is well known that the fundamental mode takes a form having a maximum value at the center as indicated by 31 in FIG. 3, and the second mode takes a vibration mode with a node at the center as indicated by 32. The modes resonate according to their natural frequencies according to their natural frequencies. This is a very well-known physical phenomenon. On the other hand, when this vibrating body is forcibly vibrated by a driving device as shown in FIG. 2, for example, the resonance frequency of free vibration and the vibration The magnitude of the acoustic signal radiated by the posture changes, and irregularities occur on the frequency characteristics.The shape also depends on the installation location of the drive on the vibrating body. (1) The present invention employs such a principle and places a plurality of driving devices on a node in a plurality of free vibration modes of a vibrating body. In the fundamental mode, in which the resonance in the vibration mode is suppressed by distributing the arrangement, the node is only in the periphery, so driving any other point does not suppress the fundamental mode. As described above, according to the present invention, since vibration and acoustic radiation are generated only in the fundamental mode over a wide frequency range, a flat speaker having excellent characteristics over a wide frequency range is realized. (3) Next, the antenna function, which is the second element of the present invention, will be described. When the above-mentioned flat vibrator is used only as a speaker, there is no problem whether it is a conductor or an insulator. There is no. However, in the present invention, as described in the claims, it is an important component that this is limited to an insulator. The above-mentioned plate-shaped vibrator is made of an electrical insulator, and an antenna is formed along the surface thereof. As is well known, the conventional television receiving antenna is mainly configured with a dipole having a length corresponding to the wavelength of the electromagnetic wave to be used, and in some cases, a waveguide and a reflector installed before and after the dipole are used. Because it is formed, and therefore bulky, takes up space, is heavy, and therefore not only places great restrictions on the installation site, but also has a nearly single resonance type corresponding to the wavelength of the electromagnetic wave used by the structure, There is a limitation on the band used, for example, VH
F (100-300 MHz) and UHF (300-1)
000 MHz) cannot be shared, and often require different antenna devices. The antenna according to the present invention is different from a simple dipole in that the elements are expanded in two directions, so that the directional characteristics are broad, and there is a feature that the directionality is flexible, such as installation on a wall surface.
Because it is a multi-resonance type, one device can support all the wavelengths to be used, and since the element is close to the insulator, that is, the dielectric, there is also a size reduction effect due to its dielectric constant,
For this reason, the present invention will be described with reference to the accompanying drawings, which realizes a small-sized, lightweight, and wide-band antenna. FIG. 4 shows a structure which forms the basis of the present invention. In FIG. 4, 41 is a connection terminal, 42 is a first open loop conductor,
3 is a second open loop conductor, 44 is a first closed loop, 45
Is a second closed loop, and 46 is one of the branch lines. These may be formed by attaching a metal layer on an insulating plate 47, which is a second invention element which can be manufactured very easily. In the structure of FIG. Is an antenna corresponding to one wavelength, and the second open loop 43 is an antenna corresponding to another wavelength. Also, with respect to the second open loop, the first and second closed loops are each loaded with the dielectric of the substrate, and thus can support a longer wavelength. Similarly, the third, fourth,. By increasing the number of open loops, the number of closed loops inevitably increases, and an antenna device corresponding to a wide range of wavelengths is constructed. The branch line connected to the loop conductor has the effect of increasing the effective length of the antenna and the effect of loading the open loop, and contributes to the complementary characteristics of the corresponding range of each loop (2).

[0006]

FIG. 5 shows an embodiment of the present invention. In FIG. 5, reference numeral 51 denotes a speaker driving device including the support described above, 52 denotes a vibrator / antenna board, 53 denotes an open and closed loop group, 54 denotes a connection terminal, 55 denotes a balanced-unbalanced converter, and 56 denotes an audio device. The signal blocking capacitor 57 is a high frequency blocking coil, 59 is a frame, and 60 is a main body side frequency separation circuit.

[0007]

As described above, the present invention is characterized in that the vibrating body surface of a speaker having a vibrating body made of an insulator is used as an antenna substrate. Since the radio frequencies are completely separated, they can be shared by the same terminal line and can provide a device that is extremely easy to handle. On the other hand, since the antenna used in the present invention has a two-dimensional configuration, it has two main axes as compared with a general dipole. In other words, since the null point direction is only one direction, the antenna has a high degree of freedom in the installation direction. That can be shared with speakers

[0008]

[References]

(1) Toshio Hayasaka: "Acoustic Engineering" Nikkan Kogyo Shimbun (2) Yasuto Mushike: Self
Complementary Antenna, Spr
inger, London (3) Y. Riko: Normal Function
n Driven Electrostatic Lo
udspeaker with Motional F
eedback 6 ^th ICA D-3-6 1986

[Brief description of the drawings]

FIG. 1 is a speaker device which is a part of the present invention.

FIG. 2 is a vibrating body driving device.

FIG. 3 is a free vibration mode of a vibrating body.

FIG. 4 shows an antenna structure forming the basis of the present invention.

FIG. 5 shows one embodiment of the present invention.

[Explanation of symbols]

11 is a vibrating body, 12 is a vibrating body driving device 1, 13 is a vibrating body driving device, 14 is a frame, 15 is a connecting line 16 and 1
7 is a driving device support, 21 is a magnet, 22 is a yoke, 23 is a voice coil, 24 is a connection wire, 25 is a center pole, 26 is a center holder, 27 is a driving contact, 31
Vibration mode in the fundamental free vibration mode of the vibrating body 32 is the vibration mode in the second mode 41 is the connection terminal, 4
2 is a first open loop conductor, 43 is a second open loop conductor,
444 is a first closed loop, 45 is a second closed loop, 46
Is a branch line, 47 is a board made of an insulator, 51 is a speaker driving device and its support 52 is a vibrator / antenna board 53 is an open and closed loop group, 54 is a connection terminal, 55 is a balanced-unbalanced conversion 56, an audio signal blocking capacitor 57, a high frequency blocking coil 59, a frame 60, a main body side frequency separation circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 1/08 H04B 1/08 A H04N 5/64 551 H04N 5/64 551Z H04R 1/02 102 H04R 1 / 02 102Z 103 103Z F term (reference) 5D017 AE22 AE28 5J046 AA04 AA12 AB11 PA07 PA09 5J047 AA03 AA12 AB11 EF05 FC01 5K016 AA04 BA11 BA13 BA14 CA01 CC01 DA04

Claims (2)

[Claims] 1. A loudspeaker (hereinafter simply referred to as a loudspeaker) device having a flat acoustic radiation vibrator (hereinafter simply referred to as a vibrator) made of an electrical insulator driven at one or more points. A plurality of closed loops composed of conductors, open loops connecting these, and branch lines connected to them are laid in a plane along the surface of the vibrating body to form an antenna having both ends of the open loop as connection terminals. Antenna and speaker device characterized by the following: 2. The speaker device according to claim 1, wherein the surface of the vibrator is white and the screen of the projection type image device is also used, or a display function is provided by printed matter.