JP2006325098A - Slidable mobile telephone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slidable mobile telephone which obtains an antenna radiation characteristic over a wide band and secures a better communication performance. <P>SOLUTION: The slidable mobile telephone couples case 1 for a displaying unit and a case for operating unit 2 together slidably by a slide module 17. A moving element 19 of the slide module 17 always has the same position relation to a substrate 10 for operating unit. The moving element 19 is connected to the substrate 10 for the operating unit through a free reactance element 24 (including 0 Ω and open). The reactance element 24 is connected to a ground of the substrate 10 for the operating unit. A connection point of the moving element 19 and the substrate 10 for the operating unit of a feeding point 25 is regarded as a feeding-point connection point 26, and the connection point of the moving element 19 and the substrate 10 for the operating unit of the opposite side to the feeding point 25 is regarded as a feeding-point connection point 27 at an opposite side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to antenna radiation characteristics of a slide-type mobile phone.

  In a conventional slide type mobile phone, a current as a radiation source flows from the antenna to both the KEY (operation) side and LCD (display) side substrates through a flexible cable. In order to meet the recent demand for thinning, it is necessary to reduce the distance between the two substrates. In this case, the distance between the flexible cable and both substrates is reduced, and a large current flows through the flexible cable. Further, in order to realize the slide mechanism of the display unit casing and the operation unit casing, a slide module that enables sliding is required. Some slide modules have a spring portion to assist opening and closing of the slide. In this case, since the spring portion is made of a conductor, a radiated current flows. Due to these factors, the slide-type mobile phone has a very complicated current distribution, and radiation is suppressed to have narrow band radiation characteristics.

  In order to improve these factors, it is necessary to control the current flowing in the flexible cable. Specifically, it is necessary to obtain the optimum conditions for the width and length of the flexible cable, the distance between both substrates, or the connection position to both substrates.

  However, it is very difficult to find the optimum condition for a flexible cable that meets the mechanical and design requirements. In addition, the antenna has a problem that the optimum flexible cable conditions differ when the slide is opened and closed. Furthermore, in the design of a multiband antenna, the optimum condition of the flexible cable differs depending on the frequency band, and optimization is very difficult.

  In addition, there is provided a folding cellular phone that changes an emission pattern (directivity) by providing an element that is not connected to the ground in a part of the folding housing and coupling the antenna element and the element when closed (for example, , See Patent Document 1). However, due to structural differences, the present technology cannot be directly applied to a sliding mobile phone.

JP 2003-37415 A

  Since the conventional slide type mobile phone is configured as described above, there is a problem that the antenna radiation characteristic becomes a narrow band.

  The present invention has been made to solve the above-described problems, and provides a slide-type mobile phone that can obtain wide-band antenna radiation characteristics by using a slide module and can secure better communication performance. For the purpose.

  A slide-type mobile phone according to the present invention includes a first housing, a second housing, a slide module that slidably connects the first housing and the second housing, and the slide A reactance element that connects the module and the substrate housed in the first or second housing;

  According to the present invention, by connecting the slide module and the substrate via the reactance element, the impedance characteristic can be improved and the antenna radiation characteristic can be widened.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below. FIG. 1 is a schematic view of a sliding mobile phone according to Embodiment 1 of the present invention. In FIG. 1, the slide type mobile phone includes a display unit casing 1 and an operation unit casing 2. On the surface of the display unit housing 1, a display unit 3 such as an LCD is provided in the center, and a receiving unit 4 and a transmitting unit 5 are provided on both sides thereof. On the surface of the operation unit housing 2, an operation unit 6 made of an operation key and the like and a transmitter 7 on one side thereof are provided. Further, the operation unit housing 2 is provided with an antenna storage unit 8 on the other side.

  FIG. 2 is a diagram showing an internal configuration of each of the display unit housing 1 and the operation unit housing 2 of FIG. In FIG. 2, the display unit housing 1 includes a display unit substrate 9, and the operation unit housing 2 includes an operation unit substrate 10. The display unit substrate 9 is connected to the display unit 3, and the operation unit substrate 10 is connected to the operation unit 6. The display unit substrate 9 and the operation unit substrate 10 are connected via a flexible cable 11. An antenna element 12 is accommodated in the antenna accommodating portion 8 of FIG.

  FIG. 3 is a detailed view of the operation unit substrate 9 in FIG. FIG. 3A is a diagram in which the antenna element 12 is formed on a dielectric base 16, and FIG. 3B is a diagram in which the antenna element 12 is formed on the operation unit substrate 10. In FIG. 3, the operation unit substrate 10 is provided with an RF circuit unit 13, and an output line from the RF circuit unit 13 is connected to an antenna. Here, the term “antenna” refers to a portion from the portion where the ground 15 is removed to the pattern of the antenna element 12 in the output transmission line from the RF circuit portion 13. That is, the feed point is a portion where the ground 15 is removed from the output transmission line from the RF circuit unit 13. The pattern formation of the antenna element 12 may be performed by any of the methods shown in FIGS.

  FIG. 4 is a diagram showing an antenna system that can be mounted on the sliding mobile phone according to the first embodiment. 4A to 4D show a plate antenna, a meander antenna, a whip antenna, and a helical antenna, respectively. The antenna system uses a type of antenna (monopole antenna) that allows current to flow through the substrate. As long as it is a monopole antenna, any of the antenna systems shown in FIGS.

  FIG. 5 is a diagram showing a slide module mounted on the slide type mobile phone according to the first embodiment. FIGS. 5A to 5F show a slide mechanism using a slide module, and FIGS. 5G to 5K show details of the slide module. 5A to 5F, a pair of slide modules 17 are arranged on the left and right sides of the display unit housing 1 to constitute a slide mechanism of the present slide type mobile phone. The slide module 17 has a spring part 20 that can be expanded and contracted. In addition, a movable portion 19 is attached to one end of the spring portion 20, and the movable portion 19 is attached to the operation unit casing 2. 5C to 5F, the slide guide 21 of the slide module 17 is fixed to the resin case of the display unit housing 1, and the movable unit 19 is fixed to the resin case of the operation unit housing 2.

  5 (g) to 5 (k), the slide module 17 accommodates the spring 23 that constitutes the spring portion 20 and its inner core 22, the movable portion 19 that is slidable with respect to the inserted inner core 22, and the like. A slide guide 21 is provided. Therefore, when the movable part 19 moves in the slide guide 21 against the expansion and contraction force of the spring 23, the opening and closing of the slide mechanism is realized. Then, by using the elastic force of the spring, it is possible to smoothly switch from the slide closed time to the open time.

  The spring 23, the inner core 22, the movable part 19, and the slide guide 21 are all conductors. In FIG. 5G, the movable portion 19 is electrically connected to the inner core 22 inserted inside. 5 (h) and 5 (i), both ends of the inner core 22 are electrically connected to the inner wall of the slide guide 21. That is, the movable portion 19 and the slide guide 21 are electrically connected via the inner core 22.

  Next, a configuration for realizing a wide band of the slide type mobile phone will be described. In the first embodiment, the current flowing through the slide module 17 is controlled to achieve a broad band of radiation characteristics. FIG. 6 is a diagram showing a configuration and operation for realizing a wide band in the slide type mobile phone according to Embodiment 1 of the present invention. FIGS. 6A and 6B show the configuration of each part when the slide is opened and closed. FIG. 6C is a longitudinal sectional view when the slide is opened and a configuration diagram of the operation unit substrate 10.

  6A to 6C, the movable portion 19 of the slide module 17 is always in the same positional relationship with respect to the operation portion substrate 10. Therefore, the movable portion 19 is connected to the operation portion substrate 10 via an arbitrary reactance element 24 (including 0Ω and open). The reactance element 24 is connected to the ground of the operation unit substrate 10. Here, “open” means “the reactance element 24 is not electrically connected”. The connection point between the movable part 19 on the feeding point 25 side and the operation part substrate 10 is a feeding point side connection point 26, and the connection point between the movable part 19 on the opposite side to the feeding point 25 and the operation part substrate 10 is connected on the reverse side of the feeding point. Point 27.

  Next, the operation will be described. FIG. 6D is a block diagram illustrating electrical connection between the slide guide 21 to the operation unit substrate 10. In FIG. 6D, the effect (impedance characteristic change) of the electrical connection between the movable portion 19 and the operation portion substrate 10 is determined by the positional relationship with the feeding point 25. That is, the current flowing through the slide module 17 can be controlled by adjusting the value of the reactance element 24 at the feeding point side connection point 26 or the feeding point reverse side connection point 27. As a result, a resonance point is generated in the impedance, and the antenna radiation characteristic can be widened.

  FIG. 7 is a diagram showing impedance characteristics when the movable portion 19 of the slide module 17 in FIG. 6 and the operation portion substrate 10 are not electrically connected. The thick line in FIG. 7 is a communication use band. The return loss is as bad as about 3 dB in the band. Generally, in order to perform good communication, it is desirable that the return loss is 6 dB or more.

  FIG. 8 is a diagram showing a change in impedance characteristics when the value of the reactance element 24 is changed at the feed point reverse side connection point 27 in FIG. 6. FIG. 8A shows the case where the reactance element 24 is an inductor, and FIG. 8B shows the case where the reactance element 24 is a capacitor. In FIG. 8, it can be seen that a resonance point is generated in the impedance and the return loss is improved. In FIG. 8A, the best impedance characteristic can be obtained by setting the reactance element 24 to 0Ω, and the return loss within the band is 6 dB or more.

  FIG. 9 is a diagram showing a change in impedance characteristics when the value of the reactance element 24 is changed at the feeding point side connection point 26 in FIG. 6. FIG. 9A shows a case where the reactance element 24 is an inductor, and FIG. 9B shows a case where the reactance element 24 is a capacitor. In FIG. 9, there is almost no change in impedance characteristics within the band.

  8 and 9, it can be seen that the positional relationship between the movable portion 19 and the operation portion substrate 10 and the feeding point 25 is important. In addition, it is considered that the return loss is improved by the resonance of the radiation current between the length from the feeding point 25 to the movable part and the slide module 17. The return loss is most improved and the bandwidth is widened by setting the feed point reverse side connection point 27 to 0Ω.

  FIG. 10 is a diagram showing a change in radiation efficiency when the reactance element 24 is open and 0Ω at the feeding point reverse side connection point 27 in FIG. 6. In FIG. 10, the radiation efficiency of 0Ω is improved by 1.2 dB at a frequency of 1950 MHz and 1.5 dB at 2150 MHz than the radiation efficiency of open.

  As described above, according to the first embodiment, by connecting the movable part 19 and the operation part substrate 10 via the reactance element 24 at the feeding point reverse side connection point 27, a wide band of antenna radiation characteristics is obtained. Can be realized.

Embodiment 2. FIG.
The second embodiment of the present invention will be described below. Since the movable portion 19 and the operation portion substrate 10 are connected when both slides are opened and closed, the connection between the two also affects the impedance characteristics when the slide is closed. In other words, the optimum reactance element 24 (Embodiment 1) when the slide is opened is not always optimum when the slide is closed. The slide-type mobile phone according to the second embodiment is designed to optimize both when the slide is opened and closed. The configuration from FIGS. 1 to 5 is the same as that of the first embodiment, and a description thereof will be omitted.

  FIG. 11 is a diagram showing details of the operation unit substrate 10 in the slide type mobile phone according to Embodiment 2 of the present invention. FIG. 11A is a configuration diagram of the operation unit substrate 10. In FIG. 11A, a single input double output SPDT (single pole double throw) switch 28 for slide opening / closing switching is provided between the movable portion 19 and the operation portion substrate 10. A reactance element 29 for opening the slide and a reactance element 30 for closing the slide are connected to the output side of each SPDT switch 28, and the movable portion 19 is connected to the input side. The reactance elements 29 and 30 are connected to the ground of the operation unit substrate 10. Instead of the SPDT switch 28, a MEMS (Micro Electro Mechanical System) switch or a semiconductor switch may be provided.

  Next, the operation will be described. FIG. 11B is a block diagram showing an electrical connection between the slide guide 21 and the operation unit substrate 10. In FIG. 11 (b), when the movable portion 19 slides within the slide guide 21, a slide open / close detection signal is input to the SPDT switch 28. The SPDT switch 28 determines a path according to the same signal corresponding to both opening and closing, and switches to the optimum reactance element (for slide opening) 29 and reactance element (for slide closing) 30 in each case.

  FIG. 12 is a diagram showing a change in radiation efficiency when the reactance element 30 is open and 0Ω when the slide is closed at the feeding point reverse side connection point 27 in FIG. 11. In FIG. 12, it can be seen that at 2150 MHz, the radiation efficiency of 0Ω is 1.1 dB lower than the radiation efficiency of open. In this case, by switching the SPDT switch 28 so that the reactance element 30 is open at the feeding point side connection point 26 and the feeding point reverse side connection point 27, it is possible to prevent deterioration in radiation efficiency when the slide is closed.

  As described above, according to the second embodiment, the antenna radiation characteristics can be obtained by switching the optimum reactance elements 29 and 30 in the respective cases when the slide is opened and closed by the SPDT switch 28 at the feeding point reverse side connection point 27. Can be realized.

Embodiment 3 FIG.
The third embodiment of the present invention will be described below. When a multiband antenna is mounted, the optimum reactance element is different in each frequency band. In this case, as in the second embodiment, an SPDT switch or a single input 3 output SP3T (Single Pole 3 Throw) switch can be provided between the operation unit board and the slide module. 1 to 5 are the same as those in the first and second embodiments, and a description thereof will be omitted.

  FIG. 13 is a diagram showing details of the operation unit substrate 10 in the slide type mobile phone according to Embodiment 3 of the present invention. FIG. 13A is a configuration diagram of the operation unit substrate 10. In FIG. 13A, an SPDT switch 28 for switching the selection frequency is provided between the movable portion 19 and the operation portion substrate 10. An optimum reactance element (for f1) 31 and reactance element (for f2) 32 (including 0Ω and open) are connected to each output side of the SPDT switch 28 in each frequency band (for example, f1 <f2), A movable portion 19 is connected to the input side. The reactance elements 31 and 32 are connected to the ground of the operation unit substrate 10. In FIG. 6A, SPDT is mounted, but SP3T is the same except that the number of reactance elements is increased. The SPDT and SP3T switches may be MEMS or semiconductor switches.

  Next, the operation will be described. FIG. 13B is a block diagram showing electrical connection between the slide guide 21 and the operation unit substrate 10. In FIG. 13B, the selection frequency detection signal is input to the SPDT switch 28 by switching the selection frequency. The SPDT switch determines a path according to the same signal corresponding to the selected frequencies f1 and f2, and switches to the optimum reactance elements 31 and 32 in each case.

  Further, a lumped constant filter can be used without using the configuration of FIG. FIG. 13C is a configuration diagram of the operation unit substrate 10 provided with a filter 33 based on a lumped constant instead of the SPDT switch 28 and the reactance elements 31 and 32 of FIG. FIG. 13D is a block diagram showing electrical connection between the slide guide 21 to the operation unit substrate 10. 13C and 13D, the filter 33 obtains a reactance value for f1 for the selected frequency f1 and a reactance value for f2 for the selected frequency f2. Since other configurations and operations are the same as described above (FIGS. 13A and 13B), description thereof is omitted.

  FIG. 14 is a diagram showing impedance characteristics when the corresponding reactance element 31 is open and 0Ω at the feed point reverse side connection point 27 in FIG. 13. In FIG. 14, a dual-band antenna having a use frequency band of 2 GHz and 800 MHz is used. In FIG. 14, the 0 Ω reactance element (see FIG. 8A), which was optimal in the 2 GHz band (when the slide is open), is open at 800 to 900 MHz.

  FIG. 15 is a diagram showing a change in radiation efficiency when the reactance element 31 is open and 0Ω at the feed point reverse side connection point 27 in FIG. 13. In FIG. 15, at 885 MHz, the radiation efficiency of 0Ω is degraded by 0.7 dB from the radiation efficiency of open. 14 and 15, by switching the reactance element 32 for 2 GHz to 0Ω and the reactance element 31 for 800 MHz by the SPDT switch 28 so as to be open in FIG. 13, it is possible to prevent deterioration of radiation efficiency in the 800 MHz band. it can.

  Further, from FIG. 8 (a), the return loss near 1.8 GHz is improved by setting the reactance element to 0Ω at the feeding point reverse side connection point 27. Therefore, the SP3T switch is used to provide 800 MHz and 1.8 GHz. It is also possible to support a 2 GHz triple band.

  As described above, according to the third embodiment, the reactance elements 31 and 32 that are optimum for the respective selected frequencies are provided by the SPDT switch 28 at the feed point reverse side connection point 27 at the feed point reverse side connection point 27. By switching, it is possible to realize a broadband antenna radiation characteristic.

Embodiment 4 FIG.
The fourth embodiment of the present invention will be described below. FIG. 16 is a configuration diagram of a sliding mobile phone according to Embodiment 4 of the present invention. In FIG. 16, the slide module 17 is fixed to the resin case of the operation unit housing 2, and the movable unit 19 and the display unit substrate 9 are connected to each other at a connection point 35 via an optional reactance element 34. The reactance element 34 is connected to the ground of the display unit substrate 9. The fourth embodiment has the same effect as that of the first embodiment, but the configurations of the second and third embodiments can also be applied.

  As described above, according to the fourth embodiment, the slide module 17 is fixed to the resin case of the operation unit housing 2 and the movable unit 19 is connected to the display unit substrate 9 via the reactance element 34. As in the first embodiment, it is possible to realize a wide band of antenna radiation characteristics.

1 is an external view of a sliding mobile phone according to Embodiment 1 of the present invention. FIG. 2 is a diagram illustrating an internal configuration of each of a display unit housing 1 and an operation unit housing 2 in FIG. 1. FIG. 3 is a detailed view of an operation unit substrate 9 in FIG. 2. It is the figure which showed the antenna system which can be mounted in the slide type mobile telephone of FIG. It is the figure which showed the slide module mounted in the slide type mobile telephone of FIG. FIG. 3 is a diagram showing a configuration and an operation for realizing a wide band in the sliding mobile phone according to Embodiment 1 of the present invention. It is the figure which showed the impedance characteristic when the movable part 19 of the slide module 17 in FIG. 6 and the operation part board | substrate 10 are not electrically connected. FIG. 7 is a diagram showing a change in impedance characteristics when the value of the reactance element 24 is changed at a feeding point reverse side connection point 27 in FIG. 6. It is the figure which showed the change of the impedance characteristic at the time of changing the value of the reactance element 24 in the feed point side connection point 26 in FIG. FIG. 7 is a diagram showing a change in radiation efficiency depending on the presence or absence of a reactance element 24 at a feeding point reverse side connection point 27 in FIG. 6. FIG. 6 is a diagram showing details of an operation unit substrate 10 in a slide type mobile phone according to Embodiment 2 of the present invention. It is the figure which showed the change of the radiation efficiency by the presence or absence of the SPDT switch 28 at the time of a slide closing in the feeding point reverse side connection point 27 in FIG. FIG. 6 is a diagram showing details of an operation unit substrate 10 in a slide type mobile phone according to Embodiment 3 of the present invention. It is the figure which showed the impedance characteristic when the corresponding reactance element 31 is set to open and 0 (ohm) in the feed point reverse side connection point 27 in FIG. It is the figure which showed the change of the radiation efficiency in case the reactance element 31 is set to open and 0 (ohm) in the feed point reverse side connection point 27 in FIG. It is a block diagram of the slide-type mobile phone which concerns on Embodiment 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display part housing | casing, 2 Operation part housing | casing, 3 Display part, 4 Reception part, 5 Transmission part, 6 Operation part, 7 Transmission part, 8 Antenna accommodating part, 9 Display part board | substrate, 10 Operation part board | substrate, 11 Flexible cable, 12 Antenna element, 13 RF circuit part, 14 Feeding pin, 15 Ground, 16 Base, 17 Slide module, 18 Resin case, 19 Movable part, 20, Spring part, 21 Slide guide, 22 Inner core, 23 Spring, 24 reactance elements, 25 feed points, 26 feed point side connection points, 27 feed point reverse side connection points, 28 SPDT switches, 29 reactance elements (for slide opening), 30 reactance elements (for slide closing), 31 reactance elements (For f1), 32 reactance elements (for f2), 33 filters, 34 reactance elements, 35 connection points.

Claims (5)

A first housing;
A second housing;
A slide module that slidably connects the first housing and the second housing;
A slide type mobile phone comprising a reactance element for connecting the slide module and a substrate housed in the first or second housing. An open reactance element connected to the substrate and corresponding to a slide open;
A reactance element for closing that is connected to the substrate and corresponds to when the slide is closed;
A 1-input 2-output switch that connects the reactance element for opening and the reactance element for close time to an output side, and connects the slide module to an input side;
2. The sliding mobile phone according to claim 1, wherein the one-input two-output switch switches between the opening reactance and the closing reactance in accordance with an open / closed state of the sliding mobile phone. A plurality of reactance elements connected to the substrate, each corresponding to a predetermined frequency;
A plurality of reactance elements connected to the output side, and a one-input multi-output switch connecting the slide module to the input side,
The one-input multi-output switch switches a reactance element corresponding to the selected frequency among the plurality of reactance elements according to a selected frequency of the slide-type mobile phone. The described sliding mobile phone. The slide module is
A slide guide extending in the sliding direction of the sliding mobile phone;
An inner core accommodated in the slide guide, extending in the length direction of the slide guide and connecting both ends to the inner wall of the slide guide;
A spring housed in the slide guide and inserted through the inner core;
The movable part which is inserted along the inner core and slides along the slide guide between the spring and one end of the slide guide is provided. A sliding mobile phone according to any one of the preceding claims. The slide guide is fixed to the first or second housing;
5. The slide type mobile phone according to claim 4, wherein the movable portion is fixed to a case different from the case to which the slide guide is fixed.

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