JP4526429B2 - Portable radio - Google Patents

Description

  The present invention relates to a portable wireless device suitable for application to, for example, a mobile phone terminal, and more particularly to a portable wireless device in which a terminal body is composed of two housings.

  In recent years, with the widespread use of mobile phone terminals, terminals having various configurations have been developed. That is, as a casing constituting the mobile phone terminal, it is configured by two casings of a first casing and a second casing, and the two casings are different in a closed state and an opened state. As a practical example, an open state and a closed state can be selected according to the purpose of use. Specifically, a folding type terminal that folds and stores two cases, a rotary type terminal that can be turned from a closed state by rotating one of the two cases, and two cases A slide-type terminal that can be slid linearly upward or downward from a closed state to an open state has been put to practical use.

  The terminals having these shapes are not necessarily increased in size due to the mounting of a mechanism for obtaining these shapes, and the terminals having the same size or smaller than the conventional ones are required and put into practical use.

  Along with the miniaturization of the terminal size, the size required for the antenna provided in the mobile phone terminal is also reduced, and it is inevitably difficult to satisfy the radiation characteristics. As an antenna for solving this problem, for example, an auxiliary antenna called a short stub is arranged in a mobile phone terminal separately from a main antenna to improve antenna characteristics.

  FIG. 6 is a cross-sectional view showing an example in which a short stub is arranged on a slide-type mobile phone terminal. FIG. 6A shows a state in which the terminal is closed, The lower housing 2 is almost overlapped. FIG. 6B shows a state in which the terminal is opened, and is an example in which the upper casing 1 is linearly slid upward about several centimeters relative to the lower casing 2. As shown in FIG. 6, the upper casing 1 has a circuit board 1a disposed therein and a display panel 1b disposed on the surface thereof. A circuit board 2a is disposed inside the lower housing 2, and circuits necessary for communication processing are assembled on the circuit board 2a. The circuit boards 1a and 2a in the two casings 1 and 2 are electrically connected by a flexible board 3.

  An antenna element 2b is attached to the upper end inside the lower housing 2, and radio signals are transmitted and received by the antenna element 2b. A short stub 2c as an auxiliary antenna is arranged on the surface side (upper housing side) of the substrate 2a inside the lower housing 2. The short stub 2c has, for example, a shape as a plate-shaped monopole antenna configured by attaching a conductive plate to a resin housing. It is connected with. The length of the short stub 2c is set to approximately λ / 4 of the frequency of the radio signal handled by this terminal.

  The terminal shown in FIG. 6 can be used in either the closed state shown in FIG. 6 (a) or the open state shown in FIG. 6 (b). Are arranged on the upper housing 1 side so that they can be operated even in the closed state, and other keys such as numeric keys are arranged on the lower housing 2 side so that they can be operated only in the opened state. It is.

  Here, since the short stub 2c is arranged on the inner surface side of the lower housing 2, the directivity of the built-in antenna 2b is set opposite to the surface (that is, the surface on which the display panel 1b is attached). Can be directed to the side opposite to the user's head during normal use, and directivity can be imparted to the side away from the side close to the user's head. That is, the antenna 2b operates as a substantially non-directional monopole antenna in the horizontal plane with the circuit board 2a as the ground. The short stub 2c is electrically coupled to the antenna 2b and operates as an auxiliary antenna of the antenna 2b with the circuit board 2a as the ground. With the operation as the auxiliary antenna, the antenna characteristics can be widened and gained.

Patent Document 1 describes an example of a communication terminal provided with a short stub.
JP-A-4-314201

  By the way, when two housings 1 and 2 are provided as shown in FIG. 6 and the antenna 2b is arranged on the upper portion of the lower housing 2, the case of the closed state shown in FIG. There is no problem, but in the open state shown in FIG. 6B, the upper housing 1 is present on the front side of the antenna 2b and the short stub 2c, and the antenna characteristics are not improved sufficiently. there were.

  In the above description, the case of the so-called slide-type terminal configuration illustrated in FIG. 6 has been described as an example. However, in the case of a wireless communication terminal in which the terminal body is configured by two housings, Even with an open / close structure, there are similar problems.

  The present invention has been made in view of the above points, and an object of the present invention is to obtain good antenna characteristics regardless of whether the casing constituting the terminal body is in an open state or a closed state.

The present invention relates to a portable wireless device that includes a first housing and a second housing and connects the first housing and the second housing so as to be freely opened and closed. The main antenna is attached in the long axis direction with the first and second housings open , one end is exposed on the connection surface with the first housing, attached, and a short stub is attached to the second housing. and Fit takes substantially linear conductive member which serves as an antenna. Then, the first and second housings are in a closed position so that the conductive member functions as a short stub and is in contact with one end of the conductive member to be connected to the ground potential portion in the first housing. 1 in contact with one end of the conductive member so that the conductive member functions as an antenna at a position where the connection member 1 and the first and second housings are opened. A second connecting member to be connected.

  By doing in this way, when the 1st case and the 2nd case are closed, a conductive member comes to function as a short stub, and the 1st case and the 2nd case When the is opened, the conductive member functions as an antenna connected to the antenna feeding point, and good antenna characteristics can be obtained in each state.

  According to the present invention, the conductive member is switched between a case where it functions as a short stub and a case where it functions as an antenna itself depending on the open / closed state of the first housing and the second housing, and good antenna characteristics are obtained in each state. And good antenna characteristics can be ensured both in the closed state and in the open state.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In this example, the present invention is applied to a portable wireless device configured as a mobile phone terminal. A relatively high frequency band such as 800 MHz or 1.5 GHz is used as a frequency band in which the mobile phone terminal of this example wirelessly communicates with the base station.

  FIG. 1 is a cross-sectional view of the configuration of the mobile phone terminal of this example, and FIGS. 2 and 3 are diagrams showing examples of the outer shape, in which FIG. 2 is closed and FIG. 3 is open. Is shown. In this example, the present invention is applied to a slide-type mobile phone terminal. As shown in FIGS. 2 and 3, the upper housing 10 and the lower housing 20 are connected so as to be slidable up and down. is there. The slide hinge, which is a slidably connecting mechanism, is not particularly shown here, but various configurations conventionally used are applicable.

  As shown in FIG. 1, circuit boards 11 and 21 are arranged in the upper housing 10 and the lower housing 20, respectively, and circuit components necessary as a mobile phone terminal are incorporated on the substrates. For example, a wireless communication processing circuit that generates a transmission signal, demodulates a reception signal, and the like is configured by components attached to the circuit board 21. A display panel 12 is disposed on the surface side of the upper housing 10, and a circuit or the like necessary for performing display or the like is assembled on the circuit board 11 on the upper housing 10 side. The two circuit boards 11 and 21 are electrically connected to the flexible board 30 by connection connectors 31 and 32.

  As shown in FIGS. 2 and 3, operation units 10 a and 20 a configured with operation keys and the like are arranged on the surfaces of the housings 10 and 20. Here, the operation unit 20a on the housing 20 side is exposed to the outside only when the housing is open (the state shown in FIG. 3), and when the housing is closed (the state shown in FIG. 2) It is configured to be housed in the joint surface of the housings 10 and 20.

  A conductive member 13 is disposed on the back side of the circuit board 11 in the upper housing 10. For example, the conductive member 13 is formed in a long and narrow line by attaching a conductive plate to a resin housing, and the lower end portion 13a of the conductive member 13 is exposed on the connection surface with the lower housing 20. , Function as a short stub or antenna. In the case of this example, when the upper housing 10 and the lower housing 20 are closed, they are connected so as to function as a short stub, and the upper housing 10 and the lower housing 20 are opened. In the state, it is connected to function as an antenna. The specific connection configuration will be described later. The conductive member 13 is disposed beside the display panel 12 in the housing 10 as indicated by a broken line in FIGS. 2 and 3, for example, and has a length of, for example, one wavelength of a signal used for wireless communication When λ is λ, the length is set to a relationship of λ / 4.

  An antenna 22 that functions as a main antenna is disposed in the upper part of the lower housing 20 and is configured to be connected to an antenna feeding point 21 a on the circuit board 21 via a changeover switch 23. The antenna 22 is configured to function as, for example, a linear inverted L antenna in which a conductive plate is attached to a resin housing. One of the changeover switches 23 is connected to the antenna 22, and the other is connected to the end of the connection pin 24. The changeover switch 23 is switched according to the sliding state of the casings 10 and 20. That is, when the upper housing 10 and the lower housing 20 are closed, the antenna 22 is connected to the feeding point 21a, and when the upper housing 10 and the lower housing 20 are opened, the connection pin 24 is connected. It is set as the structure switched so that it may connect with the feed point 21a. The switch 23 may be switched mechanically by sliding the casings 10 and 20 or may be switched electrically by detecting the state of the casing.

  The connection pin 24 is made of a spring member, and is pressed against the upper housing 10 that is in contact with the contact pin 24 with a certain amount of pressure.

  In addition, a connection pin 25 is disposed at a position below the connection pin 24, and an end portion of the connection pin 25 is connected to a ground portion (ground potential portion) of the circuit board 21. The connection pin 23 is also composed of a spring member, and is pressed against the contacted upper housing 10 side with a certain amount of pressure. Note that the tips 24a and 25a of the two connection pins 24 and 25 overlap with the upper housing 20 regardless of the sliding position of the upper housing 20, and the tips 24a and 25a of the connection pins 24 and 25 are located. Is a positional relationship that is not exposed to the outside.

  As shown in FIG. 1 (a), when the terminal is closed, the tip 25a of the lower connection pin 25 of the two connection pins 24, 25 prepared in the lower housing 20 is The positional relationship is in contact with the lower end portion 13 a of the conductive member 13 in the upper housing 10. As shown in FIG. 1B, when the terminal is opened, the tip 24a of the upper connection pin 24 of the two connection pins 24, 25 prepared in the lower housing 20 is located on the upper side. The positional relationship is in contact with the lower end 13 a of the conductive member 13 in the housing 10.

  With such a configuration, the conductive member 13 in the upper housing 10 functions as a short stub when the terminal is closed, and functions as an antenna when the terminal is opened. FIG. 4 is a diagram showing a state in which an antenna is connected to the communication circuit 26 on the circuit board 21, FIG. 4 (a) is a connection with the terminal closed, and FIG. 4 (b) is a connection with the terminal. An open connection. As shown in FIG. 4A, when the terminal is closed, the communication circuit 26 is connected to the antenna 22 via the changeover switch 23, and the antenna 22 is used for communication as the main antenna. The antenna 22 functions as a substantially non-directional monopole antenna in the horizontal plane with the circuit board 21 as the ground. In this state, as shown in FIG. 1A, the conductive member 13 is connected to the ground portion of the circuit board 21 via the connection pin 25, and is electrically coupled to the antenna 22, so that the conductive member 13 is short-circuited. It functions as a stub and becomes an auxiliary antenna of the antenna 22 that is the main antenna. By having the conductive member 13 as a short stub, the antenna characteristics of the terminal can be widened and gained, and good antenna characteristics are ensured.

  As shown in FIG. 4B, when the terminal is opened, the communication circuit 26 is connected to the conductive member 13 via the changeover switch 23, and the conductive member 13 functions as a monopole antenna. The antenna 22 is disconnected from the communication circuit 26. At the time of this connection, as shown in FIG. 1B, it is in a state of being connected via the connection pin 24. As the positional relationship between the housings 10 and 20 at this time, as shown in FIG. 1B, the upper end of the upper housing 10 protrudes above the arrangement position of the antenna 22 of the lower housing 20. Since the conductive member 13 protruding upward is an antenna, the antenna characteristics of the terminal can be widened and gained, and good antenna characteristics are ensured.

  In this way, good antenna characteristics are ensured regardless of whether the slide-type wireless communication terminal is in the closed state or in the open state, and good wireless communication is possible in any use form. Become.

  In the above-described embodiment, when the terminal is opened, the antenna 22 is separated from the antenna feeding point so that only the conductive member 13 is used as the antenna. However, for example, the antenna 22 and the conductive member 13 are used. These two may be used together as an antenna. For example, diversity reception may be performed using the two antennas. In this case, for example, the antenna formed of the conductive member 13 may be a reception-only antenna. Alternatively, the antenna formed of the conductive member 13 may be a transmission-dedicated antenna.

  In the above-described embodiment, the present invention is applied to a slide-type wireless communication terminal. However, a closed state and an open state can be selected by connecting two housings with other mechanisms (shapes). In the case of a terminal shape, a configuration in which a state in which the conductive member is a short stub connected to the ground and a state in which the antenna is connected to the antenna feeding point may be switched depending on each state.

  For example, FIG. 5 shows an example applied to a wireless telephone terminal on the rotating side. In this example, the upper housing 50 and the lower housing 60 are connected to a state where the upper housing 50 and the lower housing 60 can be rotated by the rotation shaft member 70, and the upper housing 50 can be rotated (rotated) with respect to the lower housing 60. The configuration is connected to. In the closed state, as shown in FIG. 5A, the two casings 50 and 60 are in a positional relationship where they substantially overlap each other. In the opened state, the casing 50 is inverted as shown in FIG. 5B. It comes to be located above the housing 60.

  Circuit boards 51 and 61 are disposed in the upper casing 50 and the lower casing 60, respectively, and circuit components necessary as a mobile phone terminal are incorporated on the boards. For example, a wireless communication processing circuit that generates a transmission signal, demodulates a reception signal, and the like is configured with components attached to a circuit board 61. A display panel 52 is arranged on the surface side of the upper casing 50, and a circuit necessary for performing display or the like is assembled on the circuit board 51 on the upper casing 50 side. The two circuit boards 51 and 61 are electrically connected by a flexible board (not shown) that has passed through the rotary shaft member 70.

  An antenna 62 that functions as a main antenna is disposed in the upper part of the lower housing 60. A conductive member 53 is disposed on the back side of the circuit board 51 in the upper housing 50. For example, the conductive member 53 is formed in an elongated linear shape by attaching a conductive plate to a resin housing, and one end 53a and the other end 53b of the conductive member 53 are connected to the connection surface with the lower housing 60. It has an exposed configuration and functions as a short stub or an antenna. In the case of this example, when the upper casing 50 and the lower casing 60 are closed, they are connected so as to function as a short stub, and the upper casing 50 and the lower casing 60 are opened. In the state, it is configured to be connected so as to function as an antenna.

  As a connection configuration of the conductive member 53, as shown in FIG. 5A, the connection pin 63 connected to the ground portion of the circuit board 61 in the lower housing 60 is located away from the rotary shaft member 70. In the state where the terminal is closed, the tip 63a of the connection pin 63 is brought into contact with the one end 53a of the conductive member 53 so that the conductive member 53 functions as a short stub. Further, as shown in FIG. 5B, the connection pin 64 connected to the antenna feeding point of the circuit board 61 in the lower housing 60 is prepared at a position close to the rotating shaft member 70, and the terminal is opened. In this state, the tip 64a of the connection pin 64 is brought into contact with the other end 53b of the conductive member 53 so that the conductive member 53 functions as an antenna.

  In this way, the present invention can also be applied to a rotary portable wireless device.

  In the description so far, the conductive member functioning as a short stub or an antenna is formed of a conductive plate, but may be formed of other various conductive materials or metal plating.

  In the example of FIG. 1 described above, the main antenna is a plate-shaped monopole antenna. However, the present invention is not limited to this, and for example, a meander antenna, a helical antenna, an inverted F antenna, an inverted antenna, etc. The main antenna may be configured by an L antenna or the like.

It is sectional drawing which shows the structural example by one embodiment of this invention. It is the perspective view which showed the example of the state which closed the terminal by one embodiment of this invention. It is the perspective view which showed the example of the state which opened the terminal by one embodiment of this invention. It is explanatory drawing which showed the example of the antenna connection by one embodiment of this invention. It is sectional drawing which showed the structural example by other embodiment of this invention. It is sectional drawing which showed the example of the conventional portable radio | wireless machine.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Upper housing | casing, 11 ... Circuit board, 12 ... Display panel, 13 ... Conductive member (short stub or antenna), 20 ... Lower housing | casing, 21 ... Circuit board, 21a ... Antenna feeding point, 22 ... Antenna, 23 ... Switch, 24, 25 ... Connection pin, 26 ... Communication circuit, 30 ... Flexible board for relay, 50 ... Upper housing, 51 ... Circuit board, 52 ... Display panel, 53 ... Conductive member (short stub or antenna) , 60 ... lower housing, 61 ... circuit board, 62 ... antenna, 63 ... first connection pin, 64 ... second connection pin, 70 ... rotating shaft member

Claims (3)

In a portable wireless device composed of a first housing and a second housing, wherein the first housing and the second housing are connected in an openable and closable manner,
A main antenna is attached to the first housing,
A substantially linear conductive member functioning as a short stub and an antenna is attached to the second housing in the major axis direction with the first and second housings open , and one end of the first housing is attached to the first housing . Exposed on the connecting surface with the housing,
Connected to the ground potential portion in the first casing in contact with one end of the conductive member so that the conductive member functions as a short stub in a position where the first and second casings are closed. A first connecting member to be
In a position where the first and second housings are opened , the conductive member contacts one end of the conductive member so as to function as an antenna, and is connected to an antenna feeding point in the first housing. A portable wireless device comprising a second connecting member. The portable wireless device according to claim 1, wherein
The state in which the first and second housings are closed is a state in which the first and second housings are substantially overlapped, and the state in which the first and second housings are closed is in a closed state. said second housing and linearly slide upward from Ri state der open,
A part of the conductive member is arranged in the second casing at a position above the upper end of the first casing by sliding in the open state. Portable radio. The portable wireless device according to claim 1 or 2 ,
When the first and second housings are closed, the main antenna is connected to an antenna feeding point, and when the first and second housings are opened, the main antenna is replaced with the main antenna. A portable wireless device comprising a conductive member connected to an antenna feeding point.

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