JPH05276056A - Wrist band type loop antenna and wrist watch type radio receiver using the antenna - Google Patents

Abstract

PURPOSE:To always and normally receive a radio signal independently of attachment/detachment of the receiver to/from the wrist of the user. CONSTITUTION:A wrist watch type pager 1 consists of a main body case 2, a liquid crystal display panel 3, a speaker 5, an LED 6, a push button switch 7 and a wrist band 8. The list band 8 is made up of an antenna member 8-1 having a proper elasticity (expansion contraction property) and formed to be a spiral spring so as to be easily attached to/detached from an arm (wrist), and up of a rubber elastic member 8-2 coating the entire antenna member 8-1 so as to prevent adhesion of sweat or water caused in life environment and prevent the effect of static electricity and in well matching with the expansion/ contraction performance of the antenna member 8-1 at the attachment/ detachment. The antenna member 8-1 has proper stiffness and is well fitted to the arm in operation and formed to be a loop similarly to the case with the fitting even when the member 8-1 is not fitted to the arm. Since the antenna member 8-1 forms a loop at all times regardless of the antenna member 8-1 whether it is fitted to the wrist or not, a radio wave is always stably received normally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wristband type loop antenna and a wristwatch type radio receiver using the same.

[0002]

2. Description of the Related Art A conventional wristwatch type radio receiver, for example, a wristwatch type radio controlled timepiece which receives time data by radio waves and displays an accurate time, and a wristwatch type pager which displays and notifies by radio call or received data are provided at 12:00. The band members separated into two directions, the 6-direction and the 6 o'clock direction, are attached to the main body case, and an antenna member is provided on each band member. Then, when the wristwatch type receiver is attached to the wrist, the band members separated into two are connected, and the antenna members provided on these band members are also connected to form a loop antenna. It

[0003]

[Problems of the prior art] Generally, a loop antenna has high performance. Therefore, when the wristwatch type radio receiver is worn on an arm (wrist), the antenna forms a loop and therefore the reception sensitivity is high. Is high and the incoming quality of wireless signals is good. However, when removed from the arm, the band
Since the loop state of the antenna built into the band is released, the reception sensitivity of the antenna is lowered, the incoming quality is deteriorated, and the radio signal cannot be normally received.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wristwatch type wireless receiver which can always receive a wireless signal normally regardless of whether it is attached to or detached from an arm. It is in.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides:
The main point is that the band is composed of an antenna member so that the band can always form a loop.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of a wristwatch type pager according to an embodiment of the present invention.

In the figure, the wristwatch-type pager 1 has a liquid crystal panel 3 which is covered with a watch glass 4 and displays a received message in the center of the upper surface of a main body case 2. On the upper right side of the main body case 2, a light emitting diode (LED) 6 that blinks or lights up to inform that a radio addressed to itself is received, on the lower left side of the edge, a speaker 5 that also notifies the reception of a buzzer, and a side surface. Two push-button type switches are provided in the 3 o'clock direction. A wristband 8 for mounting the wristwatch-type pager 1 on the wrist is attached to both sides of the body case 2 on the sides 12 o'clock and 6 o'clock to form a loop.

FIG. 2 (a) is a top view of the wristwatch type pager 1, and FIG. 2 (b) is a sectional view of the wrist band 8 taken along the line AA '. As shown in FIG. 2B, the wristband 8 is an antenna member 8-1 formed in a spiral spring shape.
And a rubber-like elastic member 8-2 that covers the entire antenna member 8-1.

The antenna member 8-1 is made of a conductor,
It has a moderate elasticity (stretchability) so that it can be easily attached to and detached from the arm (wrist). It also has an appropriate rigidity and is easy to attach to the arm during use, and therefore can fall off. Moreover, due to its moderate rigidity, it is configured to maintain a loop shape even when not attached, as in the case of attachment.

The rubber-like elastic member 8-2 is constructed so as to fit well with the elasticity of the antenna member 8-1 at the time of attachment / detachment, and also prevents perspiration and daily water from adhering to prevent the influence of the movement of static electricity. It is configured to prevent the antenna member 8-1 and maintain a high reception function of the antenna member 8-1.

FIG. 3 is a block diagram showing the configuration of the internal circuit of the wristwatch type pager 1. In the figure, the CPU
The (central processing unit) 31 controls the entire device based on a microprogram stored in a built-in ROM (read only memory) (not shown).

The CPU 31 is connected to a decoder 32, a drive unit 33 for driving the speaker 5 to sound, a key input unit 34 for transmitting a key operation signal of a push button type switch to the CPU 31, and a display unit 35 for displaying and driving the liquid crystal panel 3. It

The decoder 32 has an ID-ROM 36 which is a fixed memory for storing its own calling number, and an RF amplifier (radio frequency amplification circuit), a detection circuit, and an internal circuit.
Receiving unit 33 having demodulation circuit, call number matching circuit, etc.
Are connected.

In contrast to the internal circuit of the wristwatch type pager 1 described above, one end of the antenna member 8-1 has a fixed capacitor 38.
-1 is connected to the receiving unit 33 and the variable capacitor 38-2 is connected to the ground side of the internal circuit, and the other end of the antenna member 8-1 is connected to another fixed capacitor 38-3.
Connected to the ground side of the internal circuit.

The fixed capacitors 38-1, 38-3,
An impedance matching circuit is formed by the variable capacitor 38-2 and the like, and the capacity of the variable capacitor 38-2 is adjusted at the time of factory shipment, and the impedance of the loop antenna formed by the antenna member 8-1 and
The balance with the input impedance of the RF amplifier in the receiver 37 is adjusted to be optimum.

The operation of the wristwatch-type pager 1 having the above-mentioned structure will be described.
The description will be made again with reference to FIGS. 1 and 3. The band 8 composed of the antenna member 8-1 covered with the rubber-like elastic member 8-2 forms a loop regardless of whether it is worn on the human wrist or not, and the radio transmitted from the base station at all times. A signal (radio wave) is received, and the received signal is sent to the receiving unit 37 via the impedance matching circuit.

The receiving unit 37 is activated by a control signal input from the decoder 32, detects, amplifies and demodulates the received signal to generate serial digital data of "0" and "1", and The digital data is output to the decoder 32.

The decoder 32 synchronizes the input of the received data output from the receiving unit 33 and performs error correction and the like, and further, the calling number indicated by the received data is I.
It is determined whether or not the calling number stored in the D-ROM 36 matches, and when the calling number matches, a reception interrupt command is output to the CPU 31, and
The message information received subsequently to the calling number is converted into parallel data and output to the CPU 31.
On the other hand, when the calling numbers do not match, the reception unit 37 is instructed to terminate the reception.

The key input section 34 has the two push button type switches 7 shown in FIG. 1, and is operated to switch from the sleep mode to the wireless reception mode and to stop the reception notification sound and the like. The key input signal of the switch is output to the CPU 31.

The display section 35 has a decoder, a drive circuit, etc. inside thereof, and has the liquid crystal panel 3 shown in FIG. 1 outside thereof. Then, based on the display signal input from the CPU 31, the received message and other data are displayed on the liquid crystal panel 3.

The LED 6 and the speaker 5 are used by the CPU when the calling radio wave is detected in the radio reception mode.
31 drives for a fixed time, for example, 10 seconds. CP
U31 is the reception interrupt command or push button type switch 7
Various processes are executed based on a key input signal from the. For example, processing such as displaying a received message on the display unit 35 is performed.

As described above, when the antenna member 8-1 is attached to the wrist or detached from the wrist, the antenna member 8-1 always forms a loop in any case.
The operation based on the wireless reception described above is always performed stably.
Therefore, the user can normally receive the radio signal both when wearing the wristwatch-type pager and when detached from the wrist.

In this embodiment, the antenna member is formed in the shape of a spiral spring, but a linear elastic member folded in multiple stages can be used, and various applications can be considered.

[0024]

As described above, according to the present invention, since the wristband is composed of the antenna member having the detachable elasticity and the appropriate rigidity, the wristband can be worn in the same manner as when it is not worn. Since it keeps a loop shape, it becomes possible to always form a loop antenna with a wristband. Further, since the wristwatch type pager can be configured by using the wristband type antenna member, it is possible to provide the wristwatch type pager in which wireless reception is always performed normally and stably regardless of whether or not the wristband type antenna is attached to the wrist. Become.

[Brief description of drawings]

FIG. 1 is an external perspective view of a wristwatch type pager according to an embodiment of the present invention.

2A is a top view of a wristwatch type pager, and FIG. 2B is a partial sectional view of a wristband thereof.

FIG. 3 is a block diagram showing a configuration of an internal circuit of a wristwatch type pager.

[Explanation of symbols]

 1 Wrist Watch Pager 2 Body Case 3 Liquid Crystal Panel 4 Watch Glass 5 Speaker 6 Light Emitting Diode (LED) 7 Push Button Type Switch 8 Wristband 8-1 Antenna Member 8-2 Rubber Covering Member 31 CPU (Central Processing Unit) 32 Decoder 33 drive section 34 key input section 35 display section 36 ID-ROM 37 receiving section

Claims (3)

[Claims] 1. An antenna member that forms a loop when attached to a wristwatch body case and has elasticity and rigidity that is detachable to a wrist of a human body and has both rigidity and is attached to a wrist of a human body. Is a wristband type loop antenna that is also characterized by receiving radio waves. 2. A reception processing circuit is built in the main body case,
A wristband type that is formed of an antenna member that forms a loop on the outside of the main body case and is detachably attached to the wrist of the human body and has both elasticity and rigidity, and that similarly receives radio waves when the human body is attached or not attached. A wristwatch type wireless receiver with a loop antenna attached. 3. The wristband type loop antenna according to claim 1, wherein the wristband type loop antenna has a spiral spring structure and the outside is covered with a rubber-like elastic member.