JP5691718B2 - Sensitivity adjustment device and wireless communication device - Google Patents

Description

  The present invention relates to a sensitivity adjustment device and a wireless communication device.

In recent years, techniques for transmitting and receiving (communication) various types of data, such as exchanging data by a wireless method and synchronizing information between electronic devices having a wireless communication function, are spreading.
Data transmitted and received by such wireless communication may include a lot of personal information. For this reason, in order to protect personal privacy and the like, it is necessary to accurately transmit and receive data between specific electronic devices.

  However, when there are a plurality of electronic devices around the user, there is a possibility that interference with other electronic devices may occur and wireless communication cannot be performed accurately with the target electronic device. In particular, long-wavelength radio waves such as Bluetooth (registered trademark) are resistant to obstructions and the like, and are difficult to block radio waves, and thus easily interfere with other electronic devices.

  2. Description of the Related Art Conventionally, in a wireless communication system, as a method of appropriately pairing electronic devices that are desired to communicate while avoiding interference with other electronic devices, the electronic devices (electronic devices) that are desired to be paired are positioned close to each other. In addition, when an inquiry signal is transmitted from one electronic device and the other electronic device detects this inquiry signal, a response signal is transmitted. Then, based on the fact that the electronic device is the first electronic device that responds to the inquiry signal, a method of starting point-to-point connection between both electronic devices has been proposed (see, for example, Patent Document 1). ).

  However, with this method, it is necessary to arrange electronic devices to be paired in the vicinity of each other, which is troublesome for the user. Further, the position of the other electronic device to be paired may not be known, and it is not always possible to place both electronic devices in the vicinity.

  Therefore, in order to avoid interference with other electronic devices, it is conceivable that the reception sensitivity of the antenna is lowered so that communication is not established with a device other than the target electronic device.

Special table 2007-536852 gazette

  However, there are various purposes for transmitting and receiving data between electronic devices. For example, when various types of data are transmitted and received between a mobile terminal device that is an external device worn by the user and an electronic device such as a wristwatch. To some extent, such as when sending and receiving at a very short distance, and when searching for the location of an electronic device that the user has removed from the hand, or between a mobile terminal that is an external device owned by multiple friends In some cases, transmission / reception is performed with an electronic device that is an external device that is assumed to be located at a remote location.

In the former case, although there is sufficient transmission / reception sensitivity to transmit / receive various data between the mobile terminal device worn by the user and an electronic device such as a wristwatch, the reception sensitivity is excessive. If it is high, it is possible to communicate with an electronic device which is another external device existing in the vicinity of the user, which is inconvenient. Therefore, it is desired to reduce the reception sensitivity.
On the other hand, in the latter case, if the reception sensitivity is low, it is not possible to appropriately communicate with an electronic device that is an external device located at a certain distance. desired.
For this reason, it is required that the radio wave reception sensitivity when data is transmitted / received to / from an external electronic device, which is an external device, be appropriately switched according to the purpose and application.

In this regard, in mobile phones, personal computers, and the like, reception sensitivity is switched in a communication-related module such as a reception circuit.
However, especially in small electronic devices such as wristwatches, there is a limited battery storage space, so it is important to reduce power consumption as much as possible. This method increases the power consumption in communication-related modules. There is a problem with it.
Further, when switching the reception sensitivity in the communication-related module, there is a possibility that the impact resistance performance and the like may be limited due to the complicated internal mechanism of the module and the like.

  The present invention has been made in view of the above circumstances, and provides a sensitivity adjustment device and a wireless communication device capable of adjusting the sensitivity of an antenna with a simple configuration while suppressing power consumption. It is the purpose.

The present invention
A sensitivity adjustment device that adjusts the radio wave transmission / reception sensitivity of an antenna capable of transmitting and receiving radio signals to and from an external device,
A sensitivity adjusting member that is provided so as to be movable and has a shielding portion having a different radio wave shielding degree in the moving direction;
An adjustment member moving means capable of adjusting the radio wave transmission / reception sensitivity of the antenna by moving the sensitivity adjustment member with respect to the antenna and changing a radio wave shielding degree of the shielding portion in the sensitivity adjustment member with respect to the antenna; , Bei to give a
The shielding unit is a sensitivity adjusting device characterized in that the degree of radio wave transmission differs along the circumferential direction of the sensitivity adjusting member .

  According to the present invention, by moving the sensitivity adjustment member relative to the antenna by the adjustment member moving means, the radio wave transmission sensitivity can be quickly and reliably adjusted by changing the radio wave shielding degree. Further, since the sensitivity adjusting member is simply moved by the adjusting member moving means in order to change the radio wave shielding degree as described above, the configuration becomes simple and the power consumption can be suppressed.

1 is a front view of a wristwatch body of a wristwatch to which a wireless communication device according to an embodiment is applied. It is the II-II sectional view taken on the line of the wristwatch of FIG. It is the III-III sectional view taken on the line of the wristwatch of FIG. It is a block diagram which shows the internal circuit structure of the wristwatch of FIG. It is a perspective view which shows the sensitivity adjustment member of the wristwatch of FIG. 1, and its periphery. It is sectional drawing which shows the sensitivity adjustment member of the wristwatch of FIG. 1, and its periphery. It is a graph which shows the image of the relationship between the rotation angle of the circumferential direction of an example of the sensitivity adjustment member of the wristwatch of FIG. 1, and reception sensitivity. It is a graph which shows the image of the relationship between the rotation angle of the circumferential direction of another example of a sensitivity adjustment member, and reception sensitivity. FIGS. 2A and 2B are diagrams illustrating a main part of the wristwatch of FIG. 1, in which FIG. The state where the antenna is shielded by the area is shown, and (C) shows the state where the antenna is shielded by the shielding area where the radio wave shielding degree is minimum. It is principal part sectional drawing which shows the shielding degree of the electromagnetic wave by the sensitivity adjustment member corresponding to FIG. 9 (A)-FIG. 9 (C), respectively.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following, a case where the wireless communication device according to the present invention is applied to a wristwatch will be described, but embodiments to which the present invention can be applied are not limited to this.

1 is a front view of a wristwatch body of a wristwatch according to the present embodiment, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG.
The wristwatch 100 according to the present embodiment displays time by rotating the second hand 11a, the minute hand 11b, and the hour hand 11c by electrical driving.

  The wristwatch 100 includes a main body case 1 formed in a hollow short column shape. A band to which a watch band (not shown) is attached is attached to both upper and lower end portions (upper and lower end portions in FIGS. 2 and 3) of the main body case 1, that is, a 12 o'clock side end portion and a 6 o'clock side end portion. A mounting portion 2 is formed. In addition, a plurality of operation buttons 3 for inputting various operation instructions for performing time adjustment instructions, adjustment of transmission / reception sensitivity, and the like are provided on the outer peripheral portion of the main body case 1.

  The main body case 1 has an opening on the upper surface side and an opening on the lower surface side of the main body case 1. A windshield 4 formed of a material such as transparent glass is attached to the upper surface side opening of the main body case 1 so as to close the upper surface side opening. Are attached so that the back cover member 5 closes the lower surface side opening.

  A housing 6 made of, for example, resin is provided inside the main body case 1. The housing 6 incorporates a clock movement (not shown) for moving the second hand 11a, the minute hand 11b, and the hour hand 11c, which are hands 11, and a circuit board 12 on which various electronic components are mounted. A chip-shaped antenna 13 is mounted on the circuit board 12 that functions as a circuit board. The antenna support may not be the circuit board 12.

  In the body case 1, a dial plate 15 is disposed between the housing 6 and the windshield 4. The dial plate 15 includes an upper dial plate 15a and a lower dial plate 15b. The upper dial plate 15a is cut out at the 9 o'clock side. The edge of the notch has an arc shape so as to swell toward the center of the upper dial plate 15a. The lower dial plate 15b is exposed from the notch 15a-1. On the surface of the dial plate 15, time letters 16 are provided at twelve locations at approximately equal intervals in the circumferential direction.

  A parting member 17 is disposed between the windshield 4 and the dial 15 along the peripheral edge of the dial 15.

Next, the internal circuit configuration of the wristwatch 100 will be described.
As shown in FIG. 4, the wristwatch 100 includes an input unit 200 including a switch operated by the operation button 3 and the like, a CPU (Central Processing Unit) 201, a ROM (Read Only Memory) 202, a RAM (Random Access Memory) 203, The timer circuit unit 205, the oscillation circuit unit 206, a display drive circuit unit 207 for driving a motor (not shown) for driving the pointer, and the antenna 13 are provided.

The wristwatch 100 is provided with a sensitivity adjusting device 30.
As shown in FIGS. 5 and 6, the sensitivity adjustment device 30 includes a radio wave input / output path 31 that restricts the transmission / reception direction of radio waves, a sensitivity adjustment member 32 for changing the shielding of the antenna 13 by rotational movement, Adjusting member moving means 33 for moving the sensitivity adjusting member 32.

The radio wave input / output path 31 is provided with a recess 34 provided in the housing 6 and having a peripheral wall surface formed of a radio wave shield 34a, and a hole portion 35 opened above and below the lower dial 15b and having a peripheral wall surface formed of a radio wave shield 34b. It is made up of. The radio wave shields 34a and 34b in this case are configured by, for example, sticking a magnetic sheet.
The recess 34 is located below the notch 15a-1 of the upper dial 15a. The bottom of the recess 34 is constituted by the circuit board 12, and the antenna 13 is mounted on the circuit board 12.
On the other hand, the hole 35 is located above the recess 34. The upper end opening of the hole 35 is formed on the top surface of the rib 15b-1 erected on the upper surface side of the lower dial plate 15b. Further, the lower dial plate 25 b is in contact with the housing 6 at the place where the hole 35 is located. As a result, the hole 35 communicates with the recess 34 below.

The sensitivity adjustment member 32 is configured by attaching a magnetic sheet 32c made of a radio wave semi-transmissive material to a base material 32b made of a radio wave transmissive material such as a synthetic resin. Note that the sensitivity adjustment member 32 itself may be configured by containing magnetic powder in a radio wave transmitting material such as a synthetic resin.
The sensitivity adjusting member 32 is provided on the lower dial plate 15b. The sensitivity adjusting device 32 is formed in a disc shape. The diameter of the sensitivity adjusting member 32 is larger than twice the diameter of the radio wave entrance / exit 31a. The sensitivity adjusting device 32 is fixedly supported on the rotating shaft 37 so as to cover the radio wave entrance / exit 31a from above at a position off the center. The rotary shaft 37 extends through the lower dial plate 15 b into the housing 6 and is connected to the adjustment member moving means 33.
The sensitivity adjusting member 32 is configured such that the radio wave shielding degree of the shielding portion changes in six steps in the circumferential direction. Such a configuration can be obtained, for example, by changing the number of laminated magnetic sheets or the thickness of the magnetic sheet in the vertical direction stepwise in the circumferential direction. The sensitivity adjustment member 32 changes the sensitivity of the antenna 13 depending on the rotational movement position.
FIG. 7 is a graph showing an image of the relationship between the rotation angle of the sensitivity adjustment member 32 and the reception sensitivity. A, B, C, D, E, and F attached to the sensitivity adjustment member 32 indicate shielding regions having different radio wave shielding degrees of the sensitivity adjustment member 32, and the radio wave shielding degree decreases in this order. 7 shows the change in the thickness of the outer periphery of the sensitivity adjustment member 32.
Thus, according to the sensitivity adjusting member 32, the reception sensitivity of the antenna 13 is changed in six steps by selectively using the shielding areas A, B, C, D, E, and F for shielding the antenna 13. Can be made. If the adjacent shielding area is also used, the sensitivity of the antenna 13 can be changed more finely. Further, by using two of the shielding areas A, B, C, D, E, and F, it can be changed in two steps (for example, ON / OFF).
The sensitivity adjustment member 32 may be configured such that the radio wave shielding degree continuously changes in the circumferential direction as shown in the image diagram of FIG. 8 shows the change in the thickness of the outer periphery of the sensitivity adjustment member 32. In this case, the sensitivity of the antenna 13 can be changed steplessly.

The adjustment member moving means 33 refers to a group of devices and mechanisms that are directed to rotationally move the sensitivity adjustment member 32. In this embodiment, the adjustment member moving means 33 rotates a sensitivity adjustment circuit 33a controlled by the CPU 201 that executes the adjustment member movement program, a motor (not shown) driven by the sensitivity adjustment circuit 33a, and motor power. A power transmission mechanism (not shown) for transmitting to the shaft 37 is configured. The adjusting member moving means 33 may be configured to mechanically rotate the sensitivity adjusting member 32 by rotating the crown.
The adjustment member moving means 33 rotates the sensitivity adjustment member 32.

Next, a method for adjusting transmission / reception sensitivity by the wristwatch 100 will be described. Here, a case where sensitivity is adjusted in three stages using the sensitivity adjustment member 32 shown in FIG. 7 will be described.
For example, when communicating with an external device G that is in close proximity, the sensitivity adjustment member 32 is operated by a button operation so that the shielding area A having the maximum radio wave shielding degree matches the radio wave entrance / exit 31a (FIG. 9 ( A) and FIG. 10 (A)).
Further, when the person wearing the wristwatch 100 communicates with, for example, the external device G in the room, the sensitivity adjustment member 32 is operated by a button operation, and the shielding region C having a medium radio wave shielding degree is set. Match with the radio wave entrance / exit 31a (FIG. 9B and FIG. 10B).
When the person wearing the wristwatch 100 communicates with the external device G that is several tens of meters away, the sensitivity adjustment member 32 is operated by a button operation so that the shielding area F with the minimum radio wave shielding degree is set. They are matched (FIGS. 9C and 10C).

According to the sensitivity adjusting device 30 and the wristwatch 100, the following effects can be obtained.
That is, according to the sensitivity adjustment device 30 and the wristwatch 100, the sensitivity adjustment member 32 is simply moved by the adjustment member moving means 33 in order to change the radio wave shielding degree. The amount can be suppressed.
In addition, according to the sensitivity adjusting device 30 and the wristwatch 100, the radio wave transmission / reception direction is limited by the radio wave input / output path 31 whose peripheral wall is formed of a radio wave shield, so that the control accuracy of the transmission / reception sensitivity can be increased.
Further, according to the wristwatch 100, since the movement of the sensitivity adjusting member 32 can be visually recognized from the front side through the windshield 4, the transmission / reception sensitivity can be easily confirmed.

As mentioned above, although several embodiment of this invention was described, the scope of the present invention is not limited to the above-mentioned embodiment, The range of the invention described in the claim, and its equivalent range Including.
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.
[Appendix]
<Claim 1>
A sensitivity adjustment device that adjusts the radio wave transmission / reception sensitivity of an antenna capable of transmitting and receiving radio signals to and from an external device,
A sensitivity adjusting member that is provided so as to be movable and has a shielding portion having a different radio wave shielding degree in the moving direction;
An adjustment member moving means capable of adjusting the radio wave transmission / reception sensitivity of the antenna by moving the sensitivity adjustment member with respect to the antenna and changing a radio wave shielding degree of the shielding portion in the sensitivity adjustment member with respect to the antenna; ,
A sensitivity adjusting device comprising:
<Claim 2>
The sensitivity adjusting member is a plate-like member formed in a disc shape, and is configured to be rotatable around a central axis.
The sensitivity adjustment device according to claim 1, wherein the shielding portion has different radio wave transmission degrees along a circumferential direction of the sensitivity adjustment member.
<Claim 3>
The sensitivity adjusting device according to claim 2, wherein the shielding portions have different thicknesses in the axial direction of the center stepwise along a circumferential direction of the sensitivity adjusting member.
<Claim 4>
The sensitivity according to any one of claims 1 to 3, further comprising a radio wave input / output path in which a radio wave entrance / exit is formed at one end, a peripheral wall is configured by a radio wave shielding portion, and the antenna is installed at the other end. Adjustment device.
<Claim 5>
A wireless communication device comprising the sensitivity adjustment device according to any one of claims 1 to 4.

DESCRIPTION OF SYMBOLS 1 Main body case 4 Windshield 13 Antenna 15 Dial 30 Sensitivity adjustment device 31 Radio wave entrance / exit 31a Radio wave entrance / exit 32 Sensitivity adjustment member 33 Adjustment member moving means 100 Wristwatch

Claims (5)

A sensitivity adjustment device that adjusts the radio wave transmission / reception sensitivity of an antenna capable of transmitting and receiving radio signals to and from an external device,
A sensitivity adjusting member that is provided so as to be movable and has a shielding portion having a different radio wave shielding degree in the moving direction;
An adjustment member moving means capable of adjusting the radio wave transmission / reception sensitivity of the antenna by moving the sensitivity adjustment member with respect to the antenna and changing a radio wave shielding degree of the shielding portion in the sensitivity adjustment member with respect to the antenna; , Bei to give a
The sensitivity adjusting device according to claim 1, wherein the shielding portion has different radio wave transmission degrees along a circumferential direction of the sensitivity adjusting member . The sensitivity adjustment apparatus according to claim 1, wherein the sensitivity adjustment member is a plate-like member formed in a disc shape and is configured to be rotatable about a central axis. 3. The sensitivity adjustment device according to claim 1, wherein the shielding portions have different thicknesses in the axial direction of the center stepwise along a circumferential direction of the sensitivity adjustment member. .   4. The radio wave input / output path according to claim 1, further comprising a radio wave input / output path in which a radio wave entrance / exit is formed at one end, a peripheral wall is configured by a radio wave shielding portion, and the antenna is installed at the other end. Sensitivity adjustment device.   A wireless communication device comprising the sensitivity adjustment device according to any one of claims 1 to 4.

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