CN100337367C - Antenna and wireless equipment utilizing same - Google Patents

Abstract

The present invention provides an antenna and a wireless device using the same. It is a built-in type antenna that is placed in wireless equipment represented by mobile phones. It is a small antenna that is smaller than the inverted F type and does not need to be placed on the wiring board of the equipment. The antenna of the present invention has a base part and an antenna unit made of metal fixed to a connecting part protruding toward the side of the base part on the base part, and the base part is limited to a position with a specific distance from the wiring substrate. For mounting, the connection portion makes elastic electrical connection with respect to the wiring substrate. The wireless device of the present invention has a base part, a metal antenna unit having a connecting part, a wiring board electrically connected to the connecting part, and a frame housing the base part, the antenna unit, and the wiring board. , are limited to a specific distance apart for installation.

Description

Antennas and wireless devices using them

technical field

The present invention relates to a built-in antenna used in a wireless device represented by a mobile phone and a wireless device using the same.

Background technique

In recent years, the popularization of wireless devices represented by mobile phones has become more and more remarkable, and such devices that are small and light are especially popular.

Accordingly, wireless devices are generally equipped with antennas for transmitting and receiving radio waves, and built-in antennas that are arranged in the housings of the devices have also become popular.

Such a conventional built-in antenna will be described with reference to FIGS. 6 and 7 .

Fig. 6 is an external perspective view of a conventional built-in antenna. In FIG. 6, an antenna unit 102 made of a thin metal plate is fixed on the upper surface of a base portion 101 formed in a substantially rectangular parallelepiped box made of molded resin.

The antenna unit 102 is processed into a shape corresponding to a certain transmission and reception frequency, and a power supply terminal 102A and a ground terminal 102B are provided at the ends thereof.

FIG. 7 schematically shows a plan view of installing the thus constituted antenna in a wireless device. As shown in the plan view of FIG. 7 , the antenna thus constituted is mounted on a wiring board 111 fixed at a fixed position in a housing 110 of a wireless device. Then, the power supply terminal 102A is connected to the power supply line 111A of the wiring substrate 111 , and the ground terminal 102B is connected to the ground line 111B of the wiring substrate 111 .

The prior art antenna configured as described above is called a so-called inverted F type, and this inverted F type antenna is widely used at present.

Furthermore, the above-mentioned prior art antennas are disclosed in, for example, JP-A-2001-352212 and JP-A-2002-330023.

However, the above-mentioned existing reverse F-type antenna supports the frequency bandwidth of the PDC (Personal Digital Cellular) method currently used in Japan, the GSM (Global System for Mobile Communication) method and the DCS (Digital Cellular System) method used in foreign countries, although the radio wave is maintained. However, it is very difficult to miniaturize the shape and volume of the base portion 101, the antenna unit 102, and the like. Furthermore, since this antenna is usually mounted on the wiring board 111, there is also a problem that the thickness of the wireless device becomes thicker.

Contents of the invention

In order to solve the above-mentioned conventional problems, an object of the present invention is to provide an economical and compact built-in antenna and a wireless device using the same, which reduce the size of the inverted F type device and eliminate the need for disposing it on the wiring board of the wireless device.

In order to achieve the above objects, it has the following constitutions.

The antenna has:

Base part made of resin;

Antenna unit made of metal fixed on the base part and having a connection part protruding to the rear of the base part;

The base part is mounted in a housing of the device that is positioned at a constant interval with respect to the wiring board, and the connection part is elastically electrically connected to the wiring board.

Wireless devices have:

Base part made of resin;

Antenna unit made of metal fixed on the base part and having a connection part protruding to the rear of the base part;

a wiring substrate elastically and electrically connected to the connection portion;

a frame housing the base portion, the antenna unit, and the wiring substrate,

The base portion is mounted in a housing of the device whose position is restricted with respect to the wiring board at a constant interval.

Description of drawings

FIG. 1 is an external perspective view from the front of an antenna according to an embodiment of the present invention.

Fig. 2 is an external perspective view from the rear of the antenna according to one embodiment of the present invention.

Fig. 3 is a plan view showing a state in which an antenna according to an embodiment of the present invention is arranged in a housing.

Fig. 4 is an appearance perspective view from the rear of an antenna having an antenna element portion having another shape according to an embodiment of the present invention.

5 is a plan view showing a state in which an antenna having a main part of an antenna according to an embodiment of the present invention, in which a protrusion-shaped restricting portion is provided in a base portion, is arranged in a housing of a wireless device.

FIG. 6 is a perspective view showing the appearance of a built-in antenna in the prior art.

FIG. 7 is a plan view showing a state in which a conventional antenna is arranged in a housing of a wireless device.

Detailed ways

Hereinafter, an embodiment of the present invention will be described using FIGS. 1 to 5 .

(implementation mode)

FIG. 1 is an external perspective view from the front of an antenna according to an embodiment of the present invention. Fig. 2 is an external perspective view from the rear of the antenna according to one embodiment of the present invention. FIG. 3 is a plan view showing a state in which an antenna according to an embodiment of the present invention is arranged in a housing of a wireless device. In these figures, the base portion 21 is formed of molded resin. In the base portion 21 , an elastic thin metal plate is pierced through the processed antenna unit 31 to be fixed.

Then, the central position of the base part 21 is bent to form a horizontally long substantially rectangular parallelepiped in a state protruding from the front side, and the two ends of the rear side part 22 are respectively provided with protrusions 41 having through holes for connection. The reason why the central position of the base portion 21 is formed into a curved, horizontally long substantially rectangular parallelepiped in a state protruding about the front side is to improve compatibility between the housing of the wireless device equipped with the antenna and the state inside the wireless device. This point will be described in more detail later together with FIG. 3 .

Then, on one end side of the side surface of the base portion 21, the frame-like portion 32 of the antenna unit 31 is fixed by insert molding, caulking, or the like. One side of the frame of the frame-shaped portion 32 is open.

The frame-shaped portion 32 is fixed to the rear side portion 22 of the base portion 21 , the upper portion 23 , and the front side portion 24 opposite to the rear side portion 22 with the same width.

Also, the frame-shaped portion 32 is not fixed in the lower portion 25 of the base portion 21 formed on a flat surface.

Thus, the antenna unit 31 has a first unit portion 33 . The first unit portion 33 is extended from a portion corresponding to the lower position of the front side portion 24 of the base portion 21 in the frame portion 32, and branched along the length direction of the base portion 21 parallel to the lower portion 25. stick out.

The first unit portion 33 is composed of a branch portion 33A and a connection portion 33B. There are a plurality of branched portions 33A which are thin webs in parallel relationship to the underlying portion 25 . Then, the branched portion 33A is connected to the connection portion 33B in the up-down direction on the side end side and the middle portion of the base portion 21 . The first unit portion 33 is constructed in a so-called monopole antenna-type folded form.

Therefore, the spacing between the branch portions 33A of the first unit portion 33 and the position of the connection portion 33B are configured in consideration of capacitive coupling and the like according to the reception and transmission frequency bandwidth.

In addition, the first unit portion 33 and the like can be easily and precisely formed into a desired shape by punching a metal plate, thereby improving production efficiency.

Such a first unit portion 33 is configured to be closely folded back in a zigzag shape on the same plane on all the front side portions 24 . Therefore, the area at which the first unit 33 is provided becomes small. Accordingly, the base portion 21 also becomes a substantially rectangular parallelepiped that is smaller in volume than conventional ones.

Also, it is easy to process the first unit portion 33 into a curved state. Therefore, the front side portion 24 and the like, which are curved in a protruding state on the approximately front side from such a central position, constitute the shape of the arrangement surface of the first unit portion 33 in a curved shape conforming to the external shape of the wireless device to be used. , the first unit portion 33 can be easily arranged along the above-mentioned arrangement plane.

As such a shaped antenna with a housing shape, the antenna can be mounted in a compact storage state in the housing, and contributes to the natural miniaturization of a wireless device using the antenna.

Therefore, the antenna unit 31 also has a second unit portion 34 extended from the upper portion of the frame portion 32 to the vicinity of the middle position from the upper portion 23 of the base portion 21 to the other end side portions.

Further, on a portion of the side portion 22 corresponding to the rear of the frame portion 32, a connection portion 35 is formed.

The connecting portion 35 has the following structure: an elastic arm portion 35A formed by connecting the frame portion 32 with a certain width to extend downward with a tongue shape having elasticity; a front end portion bent almost at right angles at its lower end position 35B. The front end portion 35B is a flat surface with a specific area or has protrusions and concavities and convexities on it. When the antenna is not installed, the front end portion 35B is formed at a position lower than the lower portion 25 of the base portion 21 .

With the built-in antenna of the present embodiment configured in this way, as shown in FIG. 3 , it is installed in a wireless device of a device using this type of antenna. Next, the state of loading to the wireless device using FIG. 3 will be described.

The housing 51 on the lower side of the wireless device has a rectangular box shape with an upper opening when viewed from above, formed in a central portion on the front side (corresponding to the upper side in FIG. 3 ) in a curved shape with several protrusions. Then, the position of the wiring board 52 in the wireless device is determined and accommodated at a position excluding the front portion of the internal space.

Furthermore, various electronic components and the like for operating wireless equipment are mounted on this wiring board 52 . In addition, an upper side housing or the like which is an operating part of the wireless device is also necessary. However, description and illustration of the upper side housing and the like are omitted.

Then, the antennas described above are arranged side by side at a constant distance from the wiring board 52 to the base portion 21 at the front portion of the housing 51 where the wiring board 52 is not disposed, and are housed and fixed in the housing 51 .

At this time, the first unit portion 33 side of the antenna is arranged from the front side of the housing 51 to the outer side. Such an arrangement is set in consideration of improvement in the transmission/reception performance of radio waves, the provision of a plurality of antenna units, and the like. A position-limited protruding portion 51A is provided in the frame body 51 . In this state, the antenna is mounted such that the central portion of the rear side portion 22 of the base portion 21 is positionally defined corresponding to the rear and left-right directions by the protruding portion 51A.

The central position of the rear side portion 22 of the antenna is in a shape protruding forward. Therefore, it is desirable to have a certain space in the rear portion of the rear side portion 22 in the above-described configuration state, using which space the protruding portion 51A that restricts the position of the antenna can be easily provided. In addition, it is possible to configure a device with high area efficiency.

At this time, by corresponding to the shape of the rear side part 22 of the antenna, the front side of the protruding part 51A that restricts the position of the antenna is formed. The location is limited.

Moreover, there is also a specific space near the two ends of the front side portion 24 of the current antenna, and a protruding portion for limiting the antenna position is also provided in this space, so that it is also possible to limit the antenna position.

Therefore, when the above arrangement is adopted, the respective protrusions 41 provided on the rear side portion 22 of the antenna are respectively mounted on the two fixing protrusions 53 provided on the frame body 51 . Screws (not shown) are tightened from above the protrusions 41, and the protrusions 41 and the fixing protrusions 53 are fixed.

Also, the front end portion 35B of the connection portion 35 of the antenna unit 31 is elastically and electrically connected to the signal mode portion 52A arranged on the wiring substrate 52 . If the antenna of the present application is electrically connected to the signal mode portion 52A of the wiring substrate through elastic, man-hours and materials for soldering operations are not required, and the exchange operation when a mismatch occurs is relatively easy and does not require labor and time.

At this time, the upper surface of the wiring board 52 is inserted at a position higher than the lower surface portion 25 of the antenna, and the above-mentioned current mounted state of the antenna is screwed together. By doing so, the elastic arm portion 35A of the connecting device 35 on the wiring substrate 52 generates a certain elastic force by bending on the upper side. As a result, the current spliced portion can be stably connected by this sprung force. For example, a convex portion and unevenness are provided on the front end portion 35B so that the contact point can be contacted therewith, so that the effect is further improved.

With the above configuration, the wireless device equipped with the antenna according to the present embodiment transmits and receives radio waves of a predetermined specific frequency bandwidth using the current antenna.

For example, when receiving radio waves, the function of the first unit part 33 and the second unit part 34 is to receive the current radio wave, and transmit it to the signal mode part 52A of the wiring substrate 52 through the connection device 35, and the circuit board formed in the wiring substrate 52 The control device (not shown in the figure) performs specific processing and performs functional operations corresponding to the receiving state.

On the other hand, when radio waves are transmitted, the signal transmitted from the signal mode portion 52A of the wiring board 52 is transmitted to the first unit portion 33 and the second unit portion 34 through the connection portion 35, and is transmitted as radio waves.

At this time, the current antenna sets the first unit part 33 and the second unit part 34 at the same time, and sets the respective electrical lengths to different lengths. Therefore, transmission and reception can be performed satisfactorily in at least two frequency bandwidths.

Thus, when the antenna in the present embodiment is mounted on the housing 51 of the wireless device, the antenna can be efficiently arranged in an area and reduced in size, thereby contributing to the miniaturization of the device. In addition, when the front antenna is not mounted on the wiring board 52, it is directly mounted on the bottom surface of the frame body 51 in a position-limited state at a position with a certain distance from the wiring board to obtain electrical conduction. Therefore, there is particularly an effect that the thickness of the housing 51, that is, the thickness of the entire wireless device can be easily reduced.

Also, the present antenna described above has the first unit part 33 and the second unit part 34 as an embodiment, but the number, shape and material of the unit parts are not limited thereto. An antenna according to the present invention in which the number, shape, material, etc. of element portions are different from those shown in FIGS. 1 to 3 will be described with reference to FIG. 4 .

For example, as shown in the external perspective view of FIG. 4 , the antenna unit 61 may be fixed to a rod-shaped base portion 62 in the shape of a conductive coil having a connection portion 61A at one end. In this case, it is easy to make a compact structure within the volume of the antenna unit portion which reduces the required electrical length, and it can also be downsized.

Furthermore, the mounting state of the wireless device to the current coil-shaped antenna is the same as that of the above-mentioned monopole type, and the wiring boards 52 corresponding to the current antenna are arranged in parallel. At the same time, the connection part 61A is mounted by springing onto the signal mode part 52A, and screwed from above the protruding part 62A (not shown in the figure). Therefore, the same effect of reducing the thickness of the wireless device can be obtained.

Also, methods other than fixing the antenna with screws to the housing 51 and the like may be used. At least in a state where the parallel arrangement relationship with the wiring board 52 is reliably maintained, the antenna is arranged corresponding to the wiring board 52, and if the connecting portion 35 (61A) of the antenna is in a spring-connected state with the stable signal pattern portion 52A OK.

FIG. 5 shows an embodiment in which the limit state of the antenna is further reliably determined in the frame body 51 . As shown in the top view of FIG. 5 , a convex portion 51A for limiting the position of the antenna installed in the frame body 51 is added, and a frame-shaped protrusion is provided on the antenna side and the rear side surface 22 of the base portion 21 in the direction viewed from above. Restriction Section 71. It is also possible to connect the rear surface 71A of the protruding restricting portion 71 to the end surface of the wiring board 52, or to mount it with a slight gap.

In this case, the juxtaposition state of the antenna and the wiring board 52 can be reliably maintained by the protruding restricting portion 71 . As a result, the positional accuracy of the connecting device 35 of the antenna unit 31 is improved corresponding to the wiring board 52 , so that the state of electrical connection during antenna mounting is further stabilized.

1, 2, 3, and 5 illustrate the case where the antenna unit 31 is made of sheet metal, but the antenna unit 31 of the present invention is not limited to sheet metal, and may be made of metal.

According to the present invention as described above, the size of the antenna can be reduced, and the miniaturization of the antenna disposed on the wiring board of the wireless device can be realized. Therefore, advantageous effects such as being able to contribute to thinning of the wireless device can be obtained.

Claims (10)

1, a kind of antenna is characterized in that:

Have:

The matrix part that resin is made;

Be fixed on the above-mentioned matrix part, have metal antenna element to the connecting portion of the rear of above-mentioned matrix part projection;

Above-mentioned matrix part is limited on the position of specific spacing distance with respect to circuit board, is installed in the framework of equipment, and the corresponding above-mentioned circuit board of above-mentioned connecting portion flexibly is electrically connected.

2, antenna according to claim 1 is characterized in that:

Above-mentioned antenna element has the folded state of zigzag and the first module portion of the one pole type that constitutes.

3, antenna according to claim 2 is characterized in that:

Above-mentioned first module portion is positioned on the front side face of above-mentioned matrix part.

4, antenna according to claim 2 is characterized in that:

Above-mentioned antenna element also has the second unit portion that keeps with the different resonance frequencys of resonance frequency of above-mentioned first module portion.

5, antenna according to claim 1 is characterized in that:

The front side face of above-mentioned matrix part is made for above-mentioned framework shape.

6, antenna according to claim 1 is characterized in that:

Rear side face towards the above-mentioned matrix part of above-mentioned circuit board side has to keep having between above-mentioned matrix part and the above-mentioned circuit board the prominent shape limited section of certain distance.

7, antenna according to claim 1 is characterized in that:

Above-mentioned antenna element is a sheet metal system.

8, antenna according to claim 1 is characterized in that:

Above-mentioned antenna element is the shape of coiled type.

9, a kind of wireless device has:

The matrix part that resin is made;

Be fixed on the above-mentioned matrix part, have metal antenna element to the outstanding connecting portion in the rear of above-mentioned matrix part;

The circuit board that is electrically connected with above-mentioned connecting portion elasticity;

Take in the framework of above-mentioned matrix part, above-mentioned antenna element and above-mentioned circuit board,

Above-mentioned matrix part is limited on the position of specific spacing distance with respect to above-mentioned circuit board, is installed in the above-mentioned framework.

10, wireless device according to claim 9, wherein:

Above-mentioned framework also comprises protuberance,

Above-mentioned matrix part, is limited on the position of specific spacing distance with respect to above-mentioned circuit board by described protuberance.

Images