JPH0690107A - Antenna system for radio equipment - Google Patents

Abstract

PURPOSE:To provide an arm mounted radio equipment which can provide a stable antenna gain without being affected by a band size. CONSTITUTION:When the band for arm mounting of the arm mounted radio equipment is loop-shaped through an end buckle 31 provided with a metal electrode panel 32, the loop-shaped antenna body is composed of first and second conductor panels 5L and 5R. An area change part 15 is provided on the head side of the first conductor panel 5L and when the link position of the band is changed corresponding to the thickness of the arm of a mounting person, the facing area (electric coupling capacity) of the first conductor panel 5L and the metal electrode panel 31 is changed corresponding to the change of the inductance of the antenna body so as to compensate the shift of a resonance frequency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio antenna device having an antenna body integrally formed with a band body for mounting on an arm or the like.

[0002]

2. Description of the Related Art Among wireless devices such as portable transmitters and portable receivers, an antenna device for a wrist-worn wireless device that can be carried while worn on an arm has, for example, a structure shown in FIG. Has been devised. In this figure, a wrist-worn radio device 90 includes a case body 92 (radio device body) in which a circuit board for the radio device is stored, and an insulating first band body 91a and a first band body 91a connected to both sides thereof. Band body 2
1b and an arm mounting band 91, and these first and second band bodies 91a, 91b,
Inside thereof, there are strip-shaped first and second conductor plates 93a,
93b is fixed. Here, the first conductor plate 93
Both a and the second conductor plate 93b are conductively connected to the radio device circuit provided therein on the side of the case body 92, while on the free end side thereof, the first and second conductor plates 93b
Also, it is conductively connected to the band connector portions 91c and 91d of the second band members 91a and 91b. Therefore, the first and second band connector portions 91c and 91d are interposed.
When the band members 91a and 91b of No. 1 are connected, as shown in the equivalent circuit of FIG.
a and 93b form a loop through the radio device circuit 94 and the band connector portions 91c and 91d inside the case body 92, and an antenna body 95 that is a one-loop antenna is formed.
Will be configured. Here, in the radio device circuit 94, a high-frequency amplifier circuit 94b is conductively connected to the first conductor plate 93a side via a coupling capacitor 94a, and is connected to the ground potential. A variable capacitor 94c is loaded. The side of the second conductor plate 93b is fixed at the ground potential.

[0003]

However, in the conventional antenna body 95 for a wrist-worn radio, since the thickness of the arm differs depending on the wearer, the first and second band bodies 91a and 91b are connected to each other. There is a problem in that the perimeter of the antenna changes depending on the position, and the inductance value of the antenna changes, so that the antenna gain decreases. That is, in the antenna body 95, when the band size is changed by the wearer and the inductance value of the antenna body 95 is changed, the resonance frequency is shifted and the antenna gain is reduced.

In view of the above problems, the object of the present invention is to
An object of the present invention is to realize an antenna device for a wrist-worn wireless device that can obtain a stable antenna gain without being affected by the difference in band size depending on the wearer.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, the measures taken in the antenna device for a radio device according to the present invention include a band in which the free end side of an insulating band member is separated and connected. A band connector portion that allows the body to be worn on an arm and the like, a conductor plate that is fixed to the band body and that forms a loop-shaped antenna body in a state where the band body is connected by the band connector portion, and a band. Corresponding to the change in the inductance value of the antenna body caused by the connecting position on the free end side of the body, the connecting position on the free end side of the band body configures between the conductor plate and the electrode section provided on the band connector section. And a resonance frequency compensating means for changing the capacitance value of the electrical coupling capacitance.

Here, as the resonance frequency compensating means, a conductor plate for changing the capacitance value of the electric coupling capacitance by changing the facing area of the electrode portion and the conductor plate depending on the connection position on the free end side of the band body. It is possible to employ a device utilizing the area changing part on the side, the dielectric constant changing part on the band body side, or the wall thickness changing part on the band body side.

In the present invention, it is preferable to form a groove in the lengthwise direction of the conductor plate so that the antenna body also functions as a slot antenna.

[0008]

In the antenna device for a radio device according to the present invention having the above means, the conductor plate forms a loop-shaped antenna body in a state where the band body is connected by the band connector portion. Changes depending on the thickness of the arm, etc., so the inductance value of the antenna changes. Here, with respect to the electrical coupling capacitance formed between the conductor plate and the electrode portion on the band connector portion side, for example, depending on the connection position on the free end side of the band body, for example, the electrode portion and the conductor plate Since there is a resonance frequency compensating means for changing the facing area, the permittivity between the electrode portion and the conductor plate or the facing distance between the electrode portion and the conductor plate, the antenna body is connected depending on the connecting position on the free end side of the band body. Even if the inductance value changes, the electric coupling capacitance also changes in accordance with the change, so that the product of the inductance value and the capacitance value of the electric coupling capacitance is kept constant, and the resonance frequency does not change. Therefore, a stable antenna gain can be obtained without being affected by the difference in band size depending on the wearer.

Further, when the groove is formed in the length direction of the conductor plate constituting the antenna body, an antenna body which functions as a slot antenna is formed, and the antenna body is grooved toward the outer periphery. As a result, the directivity in the circumferential direction of the antenna body is improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1] FIG. 1 is a cross-sectional view showing the overall structure of an arm-mounted radio device (antenna device for arm-mounted radio device) according to Embodiment 1 of the present invention, and FIG. And FIG. 3 is a vertical sectional view of the band body extended.

In these figures, a wrist-worn radio device 1 of this example is a receiver main body 2 having a circuit board 22 and a radio device circuit block 23 (reception circuit block) in an outer case 21, and a receiver main body 2 thereof. It has a wrist-attached band 3 including a first band body 3L and a second band body 3R made of leather, a silicon resin molded body, a urethane resin molded body, etc., which are connected to the side portions of the main body 2. A metal buckle 31 (middle clasp) is attached to an end portion of the second band body 3R of the arm wearing band 3, and by this buckle 31, the free end of the first band body 3L is fixed. A band connector portion 30 that is connected to the end portion of the second band body 3R is configured.

Here, the first band body 3L and the second band body 3R are constructed by stitching or insulating an insulating sheet made of leather, silicon resin, urethane resin or the like. , A first conductor plate 5L and a second conductor plate 5R inside them, respectively.
And are fixed together. In addition, FIG. 1 shows a state in which the first band body 3L and the second band body 3R are connected via the buckle 31 of the arm mounting band 3 and in this state, the first band body 3L and the first band body 3L are connected to each other. A loop can be formed with the second band body 3R. Here, the first conductor plate 5L and the second conductor plate 5R are in a state of conductive connection on the side of the receiver body 2. That is, inside the outer case 21, the circuit board 22 and the radio circuit block 23 are provided.
Of which, in the wiring pattern of the circuit board 22,
While the antenna input terminal 24 is conductively connected by soldering or the like, as shown in FIG. 4, the through conductor 25 penetrating the outer case 21 is conductively connected to the antenna input terminal 24. Against the first
The second conductor plates 5L and 5R are electrically conductive. The insulating members 261 and 261 are provided around the through conductor 25.
62 is arranged, and the insulation and airtightness there are ensured. In addition, as shown in FIG.
A battery 213 for supplying power is provided between the back cover 212 and the circuit board 22 inside the battery.
3 is provided with an electrode plate 214 for making a wiring connection from the negative side electrode 215 and an electrode plate 217 for making a wiring connection from the positive side electrode 216. Here, the electrode plate 217 is in a state of being biased toward the positive electrode 216 by the coil spring 218. On the other hand, as shown in FIG. 5, FIG. 6, FIG. 7 and FIG. 8 in addition to FIGS. 1 to 4, on the free end side of the second band body 3R, the metal buckle 31 is provided with the screw 321. The buckle 31 is integrally formed with a metal electrode plate 32. Here, the metal electrode plate 32 is the second band body 3
Conductive connection is made to the end of R via a screw 321. Therefore, as shown in FIG. 5, when the first band body 3L is passed along the arrow A from the free end side of the frame body 311 of the buckle 31, the first band connector portion 30 The band body 3L and the second band body 3R are connected to each other, and the metal electrode plate 32 is in surface contact with the first band body 3L as shown in FIG.
The band body 3L faces the first conductor plate 5L via the resin layer 441. Here, the first band body 3
Since the L resin layer 441 functions as a dielectric layer, the electrical coupling capacitance 6 is formed between the metal electrode plate 32 and the first conductor plate 5L. That is, as shown in FIG. 1, by connecting the first band body 3L and the second band body 3R via the buckle 31 to make the arm-wearing band 3 into a loop shape, it is fixed inside the band. The first and second conductor plates 5L and 5R also have a loop shape, but the first and second conductor plates 5L and 5R are conductively connected on the receiver body 2 side, while the band connector portion 3 is used.
At 0, the antenna body 5 in which the electric coupling capacitance 6 is inserted between the first and second conductor plates 5L and 5R is formed. Therefore, the configuration diagram of the antenna body 5 is shown in FIG.
And its equivalent circuit is shown in FIG. That is, in the antenna circuit 10, in the antenna body 5, the electrical coupling capacitance 6 is inserted in the band connector portion 30, while on the receiver body 2 side, the receiving circuit 231 (wireless) formed inside thereof is provided. Circuit block 2
3) are connected, and the first conductor plate 5L is represented by an inductance L1 and the second conductor plate 5R is represented by an inductance L2, these inductors L1 and L2 and the electrical coupling capacitance 6 are high frequency. It is in a state of serial connection. In FIGS. 9A and 9B, the antenna body 5 has
The variable capacitor 232 of the receiving circuit 231 is in a state of being connected in series. This variable capacitor 232 is
It is used to adjust its resonant frequency by changing its capacitance value, which is in a fixed state. In addition, one side of the antenna body 5 (the first conductor plate 5
L) is connected to a terminal 234 for connection with a high frequency circuit via a coupling capacitor 233, while the other side of the antenna body 5 (second conductor plate 5R) is grounded. The reception circuit 231 is an unbalanced circuit type.

Here, in the arm-mounted wireless device 1 of this example, as shown in FIG. 2, on the side of the first belt body 3L,
The first that functions as one electrode of the electrical coupling capacitor 6
On the other hand, the end of the conductor plate 5L has a narrow area changing portion 15 toward the front end side, while the second belt body 3R functions as the other electrode of the electrical coupling capacitance 6. The metal electrode plate 32 for carrying the
Has a constant area and is sufficiently wide. Therefore, when used by a wearer with a narrow arm, the first conductor plate 5L mechanically engages with the buckle 31 at a position closer to the case body 21 from its free end. That is, since the metal electrode plate 32 faces the relatively wide region of the first conductor plate 5L, the capacitance value C1 of the electrical coupling capacitance 6 becomes large. On the other hand, when used by a user with a thick arm, the buckle 31 is placed at a position near the free end of the first conductor plate 5L.
Mechanically engages. That is, since the metal electrode plate 32 faces the region where the width of the first conductor plate 5L is relatively narrow, the capacitance value C1 of the electrical coupling capacitance 6 becomes small. The resonance frequency compensation structure for compensating for the deviation of the resonance frequency f is configured by using the first conductor plate 5L having such an area changing portion 15, and its operation will be described in detail later. Regarding the connection method of the receiving circuit 231 to the antenna body 5, as shown in FIGS.
It is also possible to connect the reception circuit 231 to both terminals (first and second conductor plates 5L and 5R) of the variable capacitor 232 to form a balanced circuit system. As shown in the block diagram of FIG. 11, the receiving circuit 231 has a high-frequency amplifier circuit 231b that is connected to the terminal 234 and amplifies a signal that has passed through the antenna circuit 10, and the high-frequency amplifier circuit 231.
A mixing circuit 231d that mixes the signal that has passed through b with the signal from the local oscillation circuit 231c and converts it to an intermediate frequency, and an intermediate frequency amplifier circuit 231e that amplifies this intermediate frequency.
A detection circuit 231f for detecting the signal amplified by the intermediate frequency amplification circuit 231e, and the detection circuit 231f.
And a reproduction circuit 231g which reproduces the demodulated signal detected in.

In the wrist-worn radio device 1 having such a structure, the resonance frequency f in the antenna circuit 10 shown in FIG. 9B is as shown in the following equation (1), that is, the resonance frequency f of the first conductor plate 5L. Inductance L1 and second conductor plate 5R
Inductance L2 and the capacitance value C of the electrical coupling capacitance 6
1 and the combined capacitance Ct of the capacitance value C2 of the variable capacitance 232.

[0016]

[Equation 1]

[0017]

[Equation 2]

Therefore, in order to keep the resonance frequency f constant,
It suffices to maintain the relation that Expression (1) holds.

[0019]

[Equation 3]

Here, the inductance L1 and the inductance L2 are connected in a high frequency manner via a buckle 31, and one inductance (antenna inductance)
The antenna inductance Lt can be considered as
Is expressed by equation (3).

[0021]

[Equation 4]

Where K is the Nagaoka coefficient, μ ₀ is the magnetic permeability in vacuum, S is the loop area of the antenna body 5 when the first and second band bodies 3L and 3R are connected via the buckle 31, and N is The number of turns of the antenna body 5, M is the width of the antenna body 5.

Here, the loop area S of the antenna body 5 is
When the opening is circular and the radius is a, it is expressed by the equation (5).

[0024]

[Equation 5]

Therefore, if the loop length α of the antenna body 5 is slightly shortened, if the shortened amount is Δα,
The opening area Sa is expressed by equation (6).

[0026]

[Equation 6]

Therefore, by substituting the equation (6) into the equation (4), the ratio ΔLt of the antenna inductance Lt before and after the antenna body 5 is shortened is represented by the equation (7).

[0028]

[Equation 7]

As shown in the equation (7), when Δα increases (the loop length of the antenna body 5 decreases),
.DELTA.Lt is smaller than 1. That is, the antenna body 5
It can be seen that the value of the antenna inductance Lt is smaller than that when the loop length of is unchanged (when Δα = 0). On the other hand, when the loop length of the antenna body 5 becomes long (Δα <0), the antenna inductance Lt
The value of increases. Therefore, in order to keep the resonance frequency f constant, the value of the antenna inductance Lt becomes small when Δα becomes large (when the loop length of the antenna body 5 becomes short) in the equation (3). Capacity C
While it is necessary to increase t, when Δα becomes small and passes through 0 to become negative (when the loop length of the antenna body 5 becomes long), the antenna inductance L
Since the value of t becomes large, it is necessary to reduce the combined capacitance Ct.

Here, the capacitance value C1 of the electrical coupling capacitance 6 that defines the combined capacitance Ct and the variable capacitance capacitor 232.
As described above, the capacitance value C1 of the electrical coupling capacitance 6 that fluctuates as the length of the antenna body 5 changes is expressed by the equation (8). It

[0031]

[Equation 8]

Here, ε is the dielectric constant of the substance existing between the metal electrode plate 32 and the first conductor plate 5L, A is the facing area between the metal electrode plate 32 and the first conductor plate 5L, and d is This is the facing distance between the metal electrode plate 32 and the first conductor plate 5L.

When C1 << C2, the antenna inductance Ct which affects the resonance frequency f is given by the equation (9).
As shown by, it can be approximated to the capacitance value C1 of the electrical coupling capacitance 6.

[0034]

[Equation 9]

Here, in order to compensate the deviation of the resonance frequency f, it is necessary to make the product of the antenna inductance Lt and the combined capacitance Ct constant as shown in the equations (3) and (4). That is, the value of the change ratio ΔLt of the antenna inductance Lt may be compensated by the ratio ΔCt of the combined capacitance Ct. Equation (10) and equation (11) are obtained by transforming equation (3) to express this condition.

[0036]

[Equation 10]

[0037]

[Equation 11]

Therefore, from equations (7) and (11),
It is a condition for compensating the resonance frequency f that the ratio of change in the ratio ΔCt of the combined capacitance Ct follows the equation (12).

[0039]

[Equation 12]

Here, when the expression (9) is established, the value of ΔCt can be replaced by the change amount of the area A of the electrical coupling capacitance C1 from the expressions (8) and (9).
That is, the area A is regarded as a function of Δα, and the equation (12)
By transforming, the equation (13) is obtained.

[0041]

[Equation 13]

However, β is the area when Δα = 0. Therefore, when the loop length of the antenna body 5 is shortened (Δα> 0 and the absolute value thereof is increased), A
Since the value of (.DELTA..alpha.) Increases and the value of the capacitance value C1 of the electrical coupling capacitance 6 increases, the effect of the change in the antenna inductance Lt on the resonance frequency f is compensated.

Therefore, in the wrist-worn radio device 1 of this example, as shown in FIG. 2, on the side of the first belt body 3L,
A shape that satisfies the expression (13) with respect to the end portion of the first conductor plate 5L that functions as one electrode of the electrical coupling capacitance C1, that is, the area changing portion 15 that becomes thinner toward the tip side. Is provided. For example, as shown in FIG. 12A, a state in which the metal electrode plate 32 faces a relatively wide area of the first conductor plate 5L is set as a reference state. As shown in the figure, when the metal electrode plate 32 is used by a wearer with a thick arm to face the tip side of the first conductor plate 5L (a region where the width is relatively narrow), the value of the antenna inductance Lt is reduced. Although it shifts to a larger direction, the facing area between the first conductor plate 5L and the metal electrode plate 32 shifts to a smaller direction, and the capacitance value C1 (combined capacitance Ct) of the electrical coupling capacitors 6 becomes smaller. . Here, since the shift amount (change ratio ΔCt) of the combined capacitance Ct corresponds to the shift amount (change ratio ΔLt) of the antenna inductance Lt so as to satisfy the equation (11), the antenna inductance Lt The influence on the resonance frequency f can be compensated.

An example of the result of the trial calculation will be described first from the case where the capacitance value C2 of the variable capacitor 232 is large, for example, 1000 pF, and its influence on the combined capacitance Ct can be ignored. Here, in order to make the handling of the area change portion 15 of the first conductor plate 5L in the trial calculation easy to understand,
The area changing portion 15 of the first conductor plate 5L is shown in FIG.
Further, as shown in FIG. 13B, the width dimension is considered to be gradually narrowed toward the tip side, and the width changes every 10 mm in the longitudinal direction. Further, from the state shown in FIG. 13A, the facing position of the metal electrode plate 32 with respect to the first conductor plate 5L is 1
It shall move every 0 mm. The width of the first conductor plate 5L in the reference region A-0 is 7 mm, and the facing distance between the metal electrode plate 32 and the first conductor plate 5L, that is, the metal electrode plate 32 and the first conductor plate 5L. The thickness of the resin layer 441 of the first belt body 3L interposed between the body plate 5L and the body plate 5L is 1.8 ×
It is 10 ⁻³ m, 1.8 × 10 ⁻⁴ m or 1.6 × 10 ⁻⁵ m, and the relative permittivity ε _r is 3 when the permittivity of air of the substance is 1. The resin layer 441 has a wall thickness of 1.8 × 10 ⁻³ m under the condition that the capacitance value C1 of the electrical coupling capacitance 6 in the reference region A-0 is set to about 1 pF. The condition of 8 × 10 ⁻⁴ m is the condition of setting the capacitance value C1 of the electrical coupling capacitance 6 in the reference region A-0 to about 10 pF, and the condition of the wall thickness of 1.6 × 10 ⁻⁵ m is the reference region A−. The capacitance value C1 of the electrical coupling capacitance 6 at 0 is about 10
This is the condition for setting to 0 pF. In addition, the above condition setting is performed when the relative permittivity ε _r of the first belt body 3L interposed between the metal electrode plate 32 and the first conductor plate 5L is 5.
The wall thickness is 3 × 10 ^-3 m, 3 × 10 ^-4 m and 2.7 ×
This corresponds to the case of 10 ^-5 m. Under such conditions, when the wearer's arm is thick, from the state shown in FIG. 13A, the metal electrode plate 32 has regions A-1 and A- on the tip side of the first conductor plate 5L. Slide 10 mm toward 2 to decrease the facing area A (Δα),
When the wearer's arm is thin, the metal electrode plate 32 moves toward the regions A + 1, A + 2 on the base end side of the first conductor plate 5L by 1
The facing area A (Δα) increases by sliding by 0 mm. The areas A-1 to A + of the area changing unit 15 capable of compensating for the change in the antenna inductance Lt that occurs at that time.
Table 1 shows the result of trial calculation of the width of 2.

[0045]

[Table 1]

On the other hand, the case where the capacitance value C2 of the capacitance 232 is as small as 8 pF and the influence on the synthetic capacitance Ct cannot be ignored will be described. In this case, since it is necessary to calculate including the capacitance value C2 of the variable capacitor 232, the trial calculation formula is represented by the following formula.

[0047]

[Equation 14]

Here again, the first conductor plate 5 in the trial calculation is used.
In order to facilitate the handling of L, in the first conductor plate 5L, as shown in FIGS. 13 (a) and 13 (b), the width dimension of the area changing portion 15 becomes gradually narrower toward the tip side. It is considered to be Here, based on the state shown in FIG.
Similar to the above-mentioned trial calculation, from this state, the metal electrode plate 32
Is the width of each of the regions A-2 to A + 2 of the area changing unit 15 capable of compensating for the change in the antenna inductance Lt due to the sliding of 10 mm toward the regions A-1, A-2 or the regions A + 1, A + 2. Table 2 shows the results of trial calculation. The facing distance d between the metal electrode plate 32 and the first conductor plate 5L, that is, the metal electrode plate 32 and the first conductor plate 5L
A dielectric constant epsilon _r of the first band member 3L is 3 interposed between the conductor plates 5L, the thickness of the resin layer 441, 2.0 × 10 ^-3 m, 9.2 × 10 ^-4 m, 4.6 × 1
^0-4 m, 2.3 × 10 ^-4 m or 1.16 × 10 ^-4 m, and the combined capacitance Ct in the reference state is 0.8 pF, 1.6 pF, 2.6 pF, 4.0 pF, respectively. Alternatively, it is a condition for setting to 5.3 pF. Further, these conditions are such that when the relative permittivity ε _r of the first belt body 3L interposed between the metal electrode plate 32 and the first conductor plate 5L is 5, the wall thickness thereof is 3.4. × 10 ^-3 m, 1.5 × 10 ^-4
m, 7.7 × 10 ^-4 m, 3.8 × 10 ^-4 m and 1.9
This corresponds to the case of × 10 ^-4 m.

[0049]

[Table 2]

As described above, in the wrist-worn radio device 1 of this example, the first band member 3L and the second band member 3R are connected by the buckle 31 and the first conductor plate 5L.
The second conductor plate 5R is a loop-shaped antenna body 5
Make up. Here, since the loop length of the antenna body 5 changes depending on the thickness of the arm, the inductance value (L) of the antenna body changes. In the arm-mounted wireless device 1 of this example, a deviation of the resonance frequency f caused by a change in the loop length of the antenna body 5 is configured between the first conductor plate 5L and the metal electrode plate 32 of the buckle 31. The electric coupling capacitance C1 is changed to compensate. That is, based on the change in the loop length of the antenna body 5, the first conductor plate 5
By changing the facing area of L, the product of the antenna inductance L that defines the resonance frequency f and the combined capacitance Ct of the electrical coupling capacitances C1 and C2 is held constant, so the loop length changes. However, the resonance frequency f does not change. Therefore, a stable antenna gain can be obtained without being affected by the difference in band size depending on the wearer.

(Modification of Embodiment 1) In the arm-mounted wireless device 1 of Embodiment 1, the shape of the area changing portion 15 of the first conductor plate 5L is as shown in FIG. 14 (a). , Both sides 151, 152 have a curved shape, and the width narrows toward the tip side. Instead of this shape,
As shown in FIG. 14B, one side 153 is a straight line and only the other side 154 has a curved shape, so that the width becomes narrower toward the tip side. May be. In addition, as shown in FIG. 14 (c), both sides 155, 156 have a stepwise curved shape, and the width gradually narrows toward the leading edge, as shown in FIG. 14 (d). As shown, having a groove 158 cut from the central portion of the leading edge 157, FIG.
As shown in (e), the groove 159 has a step shape, and as shown in FIG. 14 (f), one side 160 is a straight line and only the other side 161 has a step. It may be one that has become. Alternatively, the area facing the metal electrode plate 32 may be changed by intermittently forming holes or the like in the large conductor plate 5L or the like.

(Embodiment 2) FIG. 15 shows an arm-mounted radio device (antenna device for arm-mounted radio device) according to a second embodiment of the present invention.
FIG. 4 is an explanatory view showing the structure of the tip side of the first band body of the above. This arm-mounted wireless device has the same configuration as that of the arm-mounted wireless device according to the first embodiment except the structure (resonance frequency correction means) on the tip side of the first band body. Portions having corresponding functions are designated by the same reference numerals, and detailed description thereof will be omitted.

The arm-mounted wireless device 40 of this embodiment has the same overall structure as the arm-mounted wireless device according to the first embodiment, as shown in FIG. Receiver main body 2 including a circuit block 23 for a receiver
And the first band body 3L connected to the receiver body 2
And a wrist-mounting band 3 having a second band body 3R, of which the metal buckle 31 attached to the end of the second band body 3R.
The band connector portion in which the free end sides of the first band body 3L and the second band body 3R are separated and connected by the (clasp) so that the arm wearing band 3 can be worn on the arm or the like. 30 are configured. Here, the first band body 3L and the second band body 3R are made of leather, silicone resin, urethane resin, or the like as the band constituent material. Further, a first conductor plate 5L and a second conductor plate 5R are integrally fixed to the first band body 3L and the second band body 3R, respectively. By connecting the second band body 3R to each other, the first band body 3L and the second band body 3R can form a loop-shaped antenna body 5.

Here, as shown in FIG. 15A, the antenna body 5 has a buckle 31 in the band connector portion 30.
The metal electrode plate 32 integrally formed with the buckle 31 and the first conductor plate 5 on the side of the first band body 3L mechanically engaged with the buckle 31.
Since it has an electrical coupling capacitance 6 formed between L and L, as shown in FIGS. 9 and 10, the antenna body 5 has an inductance L1 and a second inductance L1 as a first conductor plate 5L. For the inductance L2 which is the conductor plate 5R,
The electrical coupling capacitance 6 of the band connector portion 30 and the variable capacitance capacitor 232 are connected in series at high frequencies.

Also in the arm-mounted radio 40 having such a structure, the inductance L1 and the inductance L2 are combined by changing the loop length (loop area) of the antenna body 5 depending on the thickness of the wearer's arm. The antenna inductance L changes, and the resonance frequency f changes. Therefore, in the arm-mounted wireless device 40 of this example, the antenna inductance L with respect to the resonance frequency f
It has a resonance frequency compensation structure for compensating for the influence of the above by changing the capacitance value C1 of the electrical coupling capacitance 6. That is, the capacitance value C1 of the electrical coupling capacitance 6 is defined by the facing area A of the electrodes, the permittivity ε, and the facing distance d, as expressed by the above-mentioned formula (8), so Radio 4
At 0, the width of the first conductor plate 5L and the wall thickness of the first band body 3L are constant, but the first dielectric plate 5L has a constant thickness.
The band body 3L is provided with the dielectric constant changing portion 45 in which the band resin layer 451 does not partially exist and remains as the air layer 452, and the metal electrode is connected depending on the connection position on the free end side of the arm wearing band 3. A structure for compensating the influence of the antenna inductance L on the resonance frequency f by changing the dielectric constant of the capacitance value C1 of the electrical coupling capacitance 6 formed between the plate 32 and the first conductor plate 5L. It has become. Therefore, since the width of the first conductor plate 5L and the thickness of the first band body 3L are constant, the facing area A and the facing distance d are constant, but the metal electrode plate 32 and the first conductor are Between the plate 5L and the area, the ratio of the resin layer 451 as a dielectric and the air layer 452 existing is changed depending on the region. Therefore, the electrical coupling capacitance 6
Is substantially the same as the capacitance value Ca1 of the capacitance component constituted by the portion where the resin layer 451 exists, and the air layer 452.
Is expressed by the equation (14) as a combined capacity of the capacity value Ca2 of the capacity component constituted by the portion where is present.

[0056]

[Equation 15]

Where ε ₁ is the dielectric constant of the resin layer 451 and ε
₂ is the dielectric constant of the air layer, d is the resin layer 4 of the first band body 6
The thickness of 51, that is, the facing distance between the first conductor plate 5L and the metal electrode plate 32, A ₁ is the first conductor plate 5L and the metal electrode plate 32 corresponding to the portion where the resin layer 451 exists. facing area, a ₂ is an air layer 45 in the absence of a resin layer 451
2 is a facing area of the first conductor plate 5L and the metal electrode plate 32 corresponding to a portion where 2 exists.

The capacitance values Ca1 and Ca2 expressed in this way
Of the air layer 45 compared with the dielectric constant ε ₁ of the resin layer 451
The permittivity ε ₂ of ₂ is extremely small, and the ratio of the area A ₁ to the area A ₂ changes depending on the connecting position of the arm mounting band 3. Therefore, the capacitance value C 1 of the electrical coupling capacitance 6 is It can be regarded as a function of the connection position of band 3.
For example, with reference to the state shown in FIG. 15A, when the length of the antenna body 5 is increased by Δα from this state, the first conductor plate corresponding to the portion where the resin layer 451 is present. The ratio of the facing area A ₁ between 5 L and the metal electrode plate 32 decreases, and the capacitance value C 1 of the electrical coupling capacitance 6 decreases.
Becomes smaller. That is, since both the antenna inductance L and the capacitance value C1 of the electrical coupling capacitance 6 are functions of Δα as the amount of deviation from the reference position, the connection of the arm mounting band 3 depending on the thickness of the arm of the wearer. Even if the position changes, the product of the antenna inductance L and the combined capacitance Ct is kept constant, so that the antenna inductance L
The influence of the change in the resonance frequency f on the electrical coupling capacitance 6
The capacitance value C1 of 1 will compensate.

Here, a trial calculation result regarding the structure of the dielectric constant changing portion 45 of the first band body 3L will be described. In addition, in the result of this trial calculation, the capacitance C2 of the variable capacitor 232 is
Is as small as 8 pF, and its influence on the combined capacitance Ct cannot be ignored. In order to make it easier to understand the handling of the dielectric constant changing portion 45 of the first band body 3L in the trial calculation, in the dielectric constant changing portion 45, the portion where the resin layer 451 exists every 10 mm toward the tip side thereof. Is narrowed, and the facing position of the metal electrode plate 32 is assumed to move every 10 mm from the state shown in FIG. Here, the width of the first conductor plate 5L is 7
mm, and the width of the resin layer 451 there is 3.5 mm. The capacitance value C1 of the electrical coupling capacitance 6 in the reference state shown in FIG. 15 (a) is set to be 2 pF and 0.8 pF, of which the capacitance value C1 is 2 pF.
In the case of, the facing distance between the metal electrode plate 32 and the first conductor plate 5L, that is, the resin layer 45 of the first belt body 3L.
When the wall thickness of 1 is 1.7 × 10 ⁻³ m, 9.2 × 10 ⁻⁴ m or 6.1 × 10 ⁻⁴ m, a trial calculation is performed. When the capacitance value C1 is 0.8 pF, Resin layer 4 of belt body 3L of 1
The calculation is made for the case where the wall thickness of 51 is 4.26 × 10 ⁻³ m, 2.3 × 10 ⁻³ m or 1.5 × 10 ⁻³ m. Further, although the trial calculation is made for the case where the relative permittivity ε _r of the resin layer 451 is 10, 5 or 3, the relative permittivity of the air layer 452 is treated as 1. Under such conditions, when the wearer's arm is thick, from the state shown in FIG. 15A, the metal electrode plate 32 has regions A-1 and A- on the tip side of the first conductor plate 5L. Slide 10 mm toward 2,
When the permittivity ε decreases and the wearer's arm is thin, the metal electrode plate 32 slides toward the regions A + 1 and A + 2 on the base end side of the first conductor plate 5L by 10 mm, and the dielectric constant Table 3 and Table 4 show the results of trial calculation of the width of the resin layer 451 in each of the regions A-2 to A + 2 in the dielectric constant changing portion 15 capable of compensating for the change in the antenna inductance Lt that occurs when the ratio ε increases. Show.

[0060]

[Table 3]

[0061]

[Table 4]

As described above, the wrist-worn radio device 40 of this example
In the above, both the antenna inductance L and the capacitance value C1 of the electrical coupling capacitance 6 depend on the connecting position of the arm-wearing band 3 and Δ is a deviation amount from the reference position.
This capacitance value C1 is a function of α
Based on the structure of the dielectric constant changing portion 45 of L, the antenna inductance L changes in response to the change. For this reason,
Even if the connecting position of the arm mounting band 3 changes depending on the thickness of the arm of the wearer, the antenna inductance L and the combined capacitance C
Since the product of t is held constant, the capacitance value C1 of the electrical coupling capacitance 6 can compensate the influence of the change in the antenna inductance L on the resonance frequency f.

(Modification of Embodiment 2) As to the structure of the dielectric constant changing portion 45 of the wrist-worn radio device 40 of Embodiment 2, as shown in FIG. 16 (f), the first band member 3L is used. In place of the structure in which the width of the portion where is present is narrowed stepwise toward the tip side, as shown in FIG. 16A, the resin layer 451 existing in the central region of the first conductor plate 5L is formed. The width of which gradually narrows toward the tip side, FIG.
As shown in (b), the resin layer 451 has the first conductor plate 5
Those which are biased toward the side of L, as shown in FIG. 16C, the width of the resin layer 451 present in the central region of the first band body 3L narrows stepwise toward the tip side. As shown in FIG. 16 (d), the resin layer 451 is on both sides of the first conductor plate 5L, and the opening width of the groove 453 between them is gradually widened toward the tip side. As shown in FIG. 16 (e), the resin layer 451 may be provided on both sides of the first conductor plate 5L, and the opening width of the groove 454 between them may be widened stepwise toward the tip side. You can

Further, the first conductor plate 5L and the metal electrode plate 3
In changing the dielectric constant between the resin layer 45 and the resin layer 451 of the first band body 3L,
The permittivity may be changed by regularly including a material having a permittivity different from 1.

(Embodiment 3) FIG. 17 shows an arm-mounted radio device (antenna device for arm-mounted radio device) according to a third embodiment of the present invention.
It is an explanatory view showing the structure of the tip side of the first band body. In this wrist-worn radio device, the first band member is excluded from the structure on the tip side of the first band member.
Since it has the same configuration as the wrist-worn radio device according to
Portions having corresponding functions are designated by the same reference numerals, and detailed description thereof will be omitted.

In the arm-mounted radio device 46 of this example, a circuit board 22 and a radio device circuit block 23 are provided in the outer case 21 as in the arm-mounted radio device according to the first embodiment shown in FIG. The receiver main body 2 and the arm mounting band 3 including the first band body 3L and the second band body 3R connected to the side portion of the receiver main body 2 are provided, and the arm mounting band 3 is included. A metal buckle 31 (clasp) is attached to the end of the second band body 3R. Further, the first conductor plate 5L and the second conductor plate 5R are integrally fixed to the first band body 3L and the second band body 3R, respectively.

Here, the arm mounting band 3 is connectable via the buckle 31 in the band connector portion 30 thereof, and in the connected state, the first band body 3L and the second band body 3L are connected. A loop can be formed with 3R.

Here, in the band connector portion 30 of the antenna body 5, an electrical coupling capacitance 6 is formed between the end portion of the first conductor plate 5L and the metal electrode plate 32 integrally formed with the buckle 31. Is configured, and FIG. 9A and FIG.
As shown in (b), the inductance L1 as the first conductor plate 5L and the inductance L1 as the second conductor plate 5R
For 2, the electric coupling capacitor 6 and the variable capacitor 232 are in a state of being connected in series at a high frequency.

Also in the arm-mounted type radio device 46 having such a configuration, the loop length of the antenna body 5 changes depending on the thickness of the wearer's arm, so that the first conductor plate 5L (inductance L1) and the first conductor plate 5L The antenna inductance L formed by the second conductor plate 5R (inductance L2) changes, and the resonance frequency f shifts. Therefore, the arm-mounted radio device 46 of this example is configured to compensate for the shift of the resonance frequency f by changing the capacitance value C1 of the electrical coupling capacitance 6 in association with the shift of the antenna inductance L. ing. That is, the electrical coupling capacitance 6 is represented by the above-mentioned formula (8), and its capacitance value C1 is defined by the facing area A of the electrodes, the dielectric constant ε and the facing distance d. Since the thickness of the first conductor plate 5L becomes thinner toward the front end side, the wireless device 46 has the wall thickness changing portion 47 in which the thickness of the resin layer 461 of the first band body 3L becomes thicker. In the wall thickness changing portion 47, the facing area A and the dielectric constant of the electrical coupling capacitance 6 are constant depending on the facing position of the metal electrode plate 32 and the first conductor plate 5L. The facing distance d between the electrode plate 32 and the first conductor plate 5L changes. Therefore, in the wrist-worn radio device 46 of this example, as the loop length of the antenna body 5 becomes longer, the value of the antenna inductance L becomes larger, but the capacitance value C1 of the electrical coupling capacitance 6 becomes larger.
Since the value of becomes small, the antenna inductance L and
The capacitance value C1 of the electrical coupling capacitance 6 and the variable capacitance capacitor 2
The product of the capacitance value C2 of 32 and the combined capacitance Ct is kept constant, and the resonance frequency f does not change depending on the thickness of the wearer's arm.

Here, a trial calculation result regarding the structure of the wall thickness changing portion 47 of the first band body 3L will be described. The case where the capacitance C2 of the variable capacitor 232 is as small as 8 pF in the result of this trial calculation and the influence on the combined capacitance Ct cannot be ignored will be described. In order to make the handling of the wall thickness changing portion 47 of the first band body 3L in the trial calculation easy to understand, in the wall thickness changing portion 47, the first conductor plate 5L is displaced by 10 mm toward the tip side thereof. It is assumed that the resin layer 461 is thin and the resin layer 461 is thick, and the facing position of the metal electrode plate 32 is moved every 10 mm from the state shown in FIG. 17A.
Here, the width of the first conductor plate 5L is 7 mm, and the thickness (opposing distance d) of the resin layer 461 there is 3.00 mm.
Is.

The combined capacitance Ct of the capacitance value C1 of the electric coupling capacitance 6 and the capacitance value C2 of the variable capacitance capacitor 232 in the reference state shown in FIG. 17A is 0.8 pF,
1.6 pF, 2.6 pF, 4.0 pF or 5.3 pF
The total capacity is Ct
Is 0.8 pF, the relative dielectric constant of the resin layer 461 is 4.35, and when the combined capacitance Ct is 1.6 pF, the relative dielectric constant of the resin layer 461 is 9.68 and the combined capacitance Ct is 2. .6
In the case of pF, the relative dielectric constant of the resin layer 461 is 19.3.
6. When the combined capacitance Ct is 4.0 pF, the resin layer 46
1 has a relative permittivity of 38.72 and a synthetic capacitance Ct of 5.3 pF.
In this case, the relative dielectric constant of the resin layer 461 is set to 77.44. Under such a condition, when the wearer's arm is thick, the metal electrode plate 32 moves from the state shown in FIG. 17A to the regions A-1, A on the tip side of the first conductor plate 5L.
When the wearer's arm is thin while the facing distance d is increased by sliding 10 mm toward −2, the metal electrode plate 32 causes the metal electrode plate 32 to be a region A + on the base end side of the first conductor plate 5L.
By sliding 10 mm toward 1 and A + 2, the facing distance d becomes smaller. Therefore, the wall thickness changing portion 4 capable of compensating for the change in the antenna inductance Lt that occurs at that time.
Table 5 shows the results of trial calculation of the thickness of the resin layer 461 in each of the areas A-2 to A + 2 in No. 7.

[0072]

[Table 5]

As described above, the wrist-worn radio device 46 of this example
In the above, both the antenna inductance L and the capacitance value C1 of the electrical coupling capacitance 6 depend on the connecting position of the arm-wearing band 3 and Δ is a deviation amount from the reference position.
This capacitance value C1 is a function of α
Since the antenna inductance L changes according to the structure of the wall thickness changing portion 47 of L, the antenna inductance L and the antenna inductance L are changed even if the connecting position of the arm wearing band 3 changes depending on the thickness of the arm of the wearer. Since the product of the combined capacitance Ct is held constant, the capacitance value C1 of the electrical coupling capacitance 6 can compensate the influence of the change in the antenna inductance L on the resonance frequency f.

The first conductor plate 5L and the metal electrode plate 3
In changing the facing distance to the first conductor plate 5L, the thickness of the first conductor plate 5L is kept constant and the first band member 3L is changed.
Only the thickness of the resin layer 461 may be changed.

[Fourth Embodiment] FIG. 18 is a wrist-worn radio device (antenna device for a wrist-worn radio device) according to a fourth embodiment of the present invention.
FIG. 19 is a schematic horizontal sectional view from the back side of FIG.

In these figures, a wrist-worn radio device 50 of this example includes a case body 51 (radio device main body) in which a radio circuit block 56 is housed, and leather and silicone connected to the sides thereof. First band body 52L and second band body 52 made of a resin molded body, urethane resin molded body, or the like
An arm-wearing band 52 with R,
A conductor plate 53 arranged so as to traverse the inside of the case body 51 is integrally molded and fixed to the band body 52L and the second band body 52R. A slit 53a is formed in the lengthwise direction of the conductor plate 53, and the conductor plate 5 having the slit 53a is formed.
The antenna body 54 of the arm-mounted wireless device 50 is configured by 3. Here, the conductor plate 53 is provided inside the first band body 52L and the second band body 52R such as a sewn sheet-shaped insulating molded body or a laminated sheet-shaped insulating molded body. Has been. In addition, the conductor plate 53 is a thin plate-like member that can be bent when the arm mounting band 52 is mounted on the arm, and as a material thereof, conductivity is set for the purpose of reducing loss of the antenna body 54. High ones are used. Further, as shown in FIG. 19, the conductor plate 53 is arranged inside the case body 51 so as to pass through the lower surface side of the radio circuit block 56. Further, a metallic clasp 521 is attached to the end of the first band body 52L, while a clasp 522 to which the clasp 521 can be mechanically coupled is attached to the side of the second band body 52R. Is fixed and the metal electrode plate 5 is
32 is fixed. Here, the metal electrode plate 532 is
Conductive connection to the inner retainer 522, but the conductor plate 53
Since they are opposed to each other via the resin layer 520 of the second band body 52R, the metal electrode plate 532 and the conductor plate 53 are opposed to each other.
Is not conductively connected to. The connection structure of the band connector portion will be described in detail later, but when the arm-mounted wireless device 50 is mounted on the arm via the arm mounting band 52, the inner clasp 521 is placed inside the inner clasp receiver 522. Even when inserted, the clasp 521 does not conductively connect to the conductor plate 53 inside the clasp receiver 522. However, in this state, the conductor plate 53, the metal electrode plate 532, and the clasp 522 are opposed to each other via the second band body 52R. Therefore, when mounting the arm-mounted wireless device 50 on the arm, when the inner clasp 521 and the inner clasp receiver 522 are connected to each other and the arm-mounting band 52 is looped, the block diagram is shown. As schematically shown in 20, a loop-shaped antenna body 5 having a slit 53a opened on the outer circumference
4 is formed, and the clasp 521 is attached to the antenna body 54.
And band connector portion 5 using the clasp receiver 522
5 has a structure in which the electrical coupling capacitance 6 formed between the conductor plate 53, the metal electrode plate 532 and the clasp receiver 522 is interposed. Here, as shown in an enlarged view of the inside of the case body 51 in FIG. 21, in the inside of the case body 51, the circuit case 566 has the circuit board 5 for the wireless device inside.
67, the variable circuit capacitor 569 for adjusting the antenna resonance frequency is provided on the upper surface side of the wireless device circuit board 567, and the battery 564 as a power supply unit for the wireless device circuit block 56 is provided on the lower surface side thereof. Further, a conductor plate 53 is arranged on the lower side of the back cover 59 with an insulating plate 568 therebetween, and the conductor plate 53 and the radio circuit board 567 side are electrically conductive. Sex terminal 56
Wired by 3. Further, as shown in FIGS. 20 and 22, the variable capacitor 569 is wire-connected to a structure in which both sides of the slit 53a of the conductor plate 53 are loaded. Further, the high-frequency amplifier circuit portion 571 formed on the wireless device circuit board 567 of the wireless device circuit block 56 has a coupling capacitor 570 on either side of the slit 53 a formed in the conductor plate 53. However, the other side is fixed to the ground state to form an unbalanced power feeding structure. Here, as shown in FIG. 23, the high-frequency amplifier circuit portion 571 configured on the radio device circuit board 567 of the radio device circuit block 56 is provided with coupling capacitors on both sides of the slit 53 a formed in the conductor plate 53. 57
It is also possible to form a balanced power supply structure by conducting connection through 0. The radio circuit block 56 is provided with a timing circuit and a display circuit for displaying the timing information, while a liquid crystal display panel or the like is provided on the upper surface side of the case body 51 to provide a wristwatch-type radio function. The structure is given to 50.

For example, as shown in the block diagram of FIG. 24, a radio receiving circuit 62, a decoding circuit 63, and a power supply control circuit for controlling the power supply to the radio receiving circuit 62 and the decoding circuit 63 with respect to the antenna body 54. 64 and a control unit 65 that controls the power supply control circuit 64. further,
A PROM (Programmable Read Only Memory) 66 in which the unique call number to be compared in the control unit 65 is stored, an LCD drive circuit 70 for driving an LCD (Liquid Crystal Display) 72 for displaying information, and this LCD.
The oscillator circuit 71 includes a crystal oscillator that generates a clock signal used to control the drive circuit 70. Further, the control unit 65 is connected to an external operation unit 69 for inputting a command from the outside to the control unit 65, while being connected to a RAM 74 for storing transmission information and reference time information associated with the fixed call number. The RAM 74, the oscillator circuit 71, the LCD drive circuit 70, the control unit 65, and the power supply control circuit 64 form a message processing unit 60.

In the arm-mounting type radio device 50 having such a structure, the positions of the intermediate clasp 522 and the metal electrode plate 532 with respect to the second band body 52R are changed depending on the thickness of the arm of the user. For example, when the second band body 52R is worn on a thin arm, the second band body 52R is fixed at a position moved from the tip side toward the case body 51 at regular intervals. That is, as shown in FIG. 25, in the band connector portion 55, the clasps 521 are the conductor plates 5
3 is connected via a screw 525, the tip end side of which can be rotated around the axis of the rotary shaft 523 while being hooked on the shaft 524, while the fastener 527 of the middle retainer 522 is connected to the rotary shaft 528. It is possible to rotate around the axis of. Here, FIG. 25 shows a state in which the metal fastener plate 529 is constrained by rotating the fastener 527 in the direction of arrow B, and when the fastener 527 is rotated in the direction of arrow C from this state. The restraint state of the restraining plate 529 to the second belt body 52R by the fastener 527 is released.
In this released state, the second band body 52R is moved with respect to the inner clasp receiver 522 according to the thickness of the arm to adjust the loop length of the arm mounting band 52. The position after the movement of the second band body 52R at this time is limited to each position where the protrusion 531 of the restraining plate 529 engages with the recess 530 formed intermittently on the surface thereof.

Here, when the fastening position for the second band body 52R is adjusted according to the thickness of the arm, the middle fastening receiver 52
Since the portion penetrating through 2 does not contribute to the loop length of the antenna body 54, the loop length of the antenna body 54 changes depending on the thickness of the user's arm. Therefore, the resonance frequency f of the wrist-worn wireless device 50 shifts. Therefore, in the arm-mounted wireless device 50 of this example, as shown in FIG. 18, the second band body 52R of the conductor plate 53 is used.
An area changing portion 551 whose width is narrowed toward the tip side is formed at the end portion on the side of, and the facing area between the metal electrode plate 532 and the conductor plate 53 is determined by the fastening position with respect to the second band body 52R. Will change.

That is, when a user with a thick arm is used, the loop length of the antenna body 54 is extended and the opening area thereof is expanded, so that the value of the antenna inductance L is shifted in the direction of increasing. On the other hand, the facing area between the conductor plate 53 and the metal electrode plate 532 becomes smaller, and the capacitance value C1 of the electrical coupling capacitance 6 formed between the metal electrode plate 532 and the conductor plate 53 becomes smaller. . Therefore, the antenna inductance L and the electrical coupling capacitance 6
Since the product of the capacitance value C1 of the above and the combined capacitance Ct of the variable capacitor 569 is kept constant and the resonance frequency f does not shift, the antenna gain is kept high.

Further, in the wrist-worn radio device 50 of this example, the conductors fixed inside the first band body 53L and the second band body 53R are connected in a loop shape. The plate 53 constitutes a loop antenna, and further constitutes a slot antenna in which the slit 53a opens toward the outer peripheral side. Therefore, in the arm-mounted radio device 50 of this example, as shown in FIG. 26 (b), in addition to being able to respond to the magnetic field component H1 toward the opening direction of the antenna body 54 as a loop antenna, FIG. 26
As shown in (a), the magnetic field component H along the circumferential direction
Sensitive to 2. Therefore, as shown in FIG.
Under the condition that the electric field component E in the vertical direction is present, the antenna directivity in a state in which the arm mounting type wireless device 50 is left alone with the arm mounting band 52 in the horizontal direction is as shown in FIG.
As shown by the solid line 611 in (c), it is omnidirectional, and as shown in FIG. 27 (b), even when the arm-mounted wireless device 50 is worn on the arm and the arm hangs down, The directivity of the antenna is omnidirectional, as indicated by the solid line 612 in FIG. Moreover, since the arm-mounted wireless device 50 of the present example is a magnetic field detection type, it has higher sensitivity when mounted on the human body, and is therefore suitable for carrying. Further, as shown in FIG. 28, even when the arm is extended horizontally while being worn on the arm, the magnetic field component H2 in the circumferential direction is sensitive to the slot antenna in correspondence with the electric field component E in the vertical direction. Here, as shown in FIG. 29 (a), the arm-mounted wireless device 50
Is left alone with the case body 51 facing upward, the directivity thereof is a directivity obtained by combining the directivity of the loop antenna and the directivity of the slot antenna as shown by the solid line 613 in FIG. However, unlike the directivity of the loop antenna shown as the comparative example (the directivity is shown by a broken line 615), there is no bias in the directivity. Also, FIG.
As shown in (b), the magnetic field component (indicated by arrow E) and the electric field component (indicated by arrow H) in a state in which the arm is bent on the front surface of the body while the arm-mounted wireless device 50 is attached to the arm. It is considered that the distribution of () is a complicated distribution as shown in FIG. 30, for example, but its directivity is such that the magnetic field component from the back side is blocked as shown by the solid line 614 in FIG. 29 (c). Direction is expressed slightly, but the magnetic field component is enhanced by the human body,
It has been confirmed that it is almost omnidirectional. Note that FIG.
As shown in, when the arm is positioned to the side of the body,
Since it is less blocked by the body, it is more omnidirectional.

[Modification of Fourth Embodiment] FIG. 32 shows a configuration around a case body of an arm-mounted radio device (antenna device for arm-mounted radio device) according to a modification of the fourth embodiment of the present invention. FIG. 33 is a horizontal sectional view and FIG. 33 is a vertical sectional view thereof. In the arm-mounted wireless device of this example, as for the structure of the arm-mounted band, antenna body (conductor plate), etc., which are not shown, the loop antenna is the same as in the arm-mounted wireless device according to the fourth embodiment. Also, the structure is such that it can function as any of a slot antenna and a slot antenna. In addition, regarding the structure of the arm mounting band, as in the arm mounting type wireless device according to the fourth embodiment, the width of the conductor plate is narrowed toward the front end side and the facing area changing portion and the metal electrode plate. Since the capacitance value of the electrical coupling capacitance that is formed between the resonance frequency compensation structure changes according to the antenna inductance depending on the connection position of the arm wearing band, it depends on the thickness of the wearer's arm. Even if the loop length of the loop antenna changes, the change in the antenna inductance is compensated for by the change in the capacitance value of the electrical coupling capacitance so that the resonance frequency does not shift.

32 and 33, a wrist-worn radio device 80 of this example is connected to a case body 81 (radio device body) in which a radio device circuit block 86 is arranged, and a side portion thereof. First band body 82 made of a resin molded body or the like
L and a second band body 82R for arm mounting, and the first band body 82L and the second band body 82R have a first conductor plate 831 and a second conductor plate. 832 is in a state of being integrally molded and fixed. In addition, slits 83 are formed in the length direction on either side of the first conductor plate 831 and the second conductor plate 832.
a, 83b are formed, and the slits 83a, 8b
By the first conductor plate 831 and the second conductor plate 832 having 3b, the antenna body 8 of the arm-mounted wireless device 80 is provided.
4 are configured.

Here, the slits 83a and 83b are formed from the end edges of the first conductor plate 831 and the second conductor plate 832 on the side of the case body 81 to the first conductor plate 831 and the second conductor plate. 832 is formed in the length direction of 832, and the case body 8 of the first conductor plate 831 and the second conductor plate 832.
The slits 83a and 83b are open ends at the edge on the first side. Therefore, the slits 83a and 83b allow the side of the first conductor plate 831 to face the one end 831.
a and the other side end portion 831b, the second conductor plate 832 side is also separated into the one side end portion 832a and the other side end portion 832.
32b is separated. Then, the first conductor plate 83
The one end 831a of the first conductor plate 832 and the one end 832a of the second conductor plate 832 are connected to each other inside the case body 81 by wiring, and the other end 831b of the first conductor plate 831 is connected. And the other end 832 of the second conductor plate 832.
a is in a state of being wire-connected inside the case body 81. That is, in the case body 81, two conductive terminals 821a, 821b, 8 are provided on each of both side surfaces thereof.
21c and 821d are integrally formed, and one end 83 of one side of the first conductor plate 831 is formed with respect to each end thereof.
1a, the other end 831b, the second conductor plate 832
The one end 832a and the other end 832b are conductively connected by soldering or the like. The conductive terminal 821a and the conductive terminal 821c are conductively connected to each other via the one-side circuit pattern 867a of the wireless device circuit board 867 forming the wireless device circuit block 86, and are also electrically connected to the conductive terminal 821b. The conductive terminal 821d is conductively connected via the other side circuit pattern 867b of the wireless device circuit board 867. Also, as shown in FIG.
The conductive terminals 821a, 821b, 821c, 821d have a bent portion on the side of the conductive connection position with the wireless device circuit block 86, and the one-sided circuit pattern of the wireless device circuit board 867 has springiness due to this bent portion. 867a and the circuit pattern 867b on the other side are conductively connected. Therefore, vibration or the like does not propagate to the inside of the case body 81. In addition, one side circuit pattern 8
67a and the other side circuit pattern 867b are loaded with a variable capacitor 869 for adjusting the antenna resonance frequency, and a battery 864 is provided on the lower surface side of the radio device circuit board 867.
Are arranged.

In the arm-mounted radio device 80 having such a structure, the resonance frequency does not shift due to the thickness of the arm of the wearer, so that the antenna gain can be kept high.
In addition to the effect obtained in the wrist-worn radio device according to
The following effects are also achieved. That is, the first conductor plate 831
And the second conductor plate 832 are both formed on the side of the first band body 82L or the second band body 82R,
The case body 81 side means conductive terminals 821a, 821b,
Conductive connection is made via 821c and 821d, and the case body 81 side and the arm wearing band side are separate bodies. Therefore, when only the arm mounting band side is damaged while the arm mounting type wireless device 80 is used, it is easy to remove the arm mounting band side from the case body 81 and replace it. .

Since the arm-mounted radio 80 can be manufactured for each member, it has an effect of high productivity.

In any of the wrist-worn radios according to the fourth embodiment and the modification of the fourth embodiment, the resonance frequency compensating means uses the area change on the conductor plate side. Instead, by changing the ratio (dielectric constant changing portion) and wall thickness (wall thickness changing portion) of the resin layer of the band body for each region, the resonance frequency shift caused by the thickness of the arm of the wearer is changed. May be compensated.

[0088]

As described above, in the wrist-worn radio device according to the present invention, the resonance frequency shift caused by the change in the loop length of the antenna body is caused by the conductor plate and the electrode portion formed in the band connector portion. It is characterized in that a resonance frequency compensating means for compensating by changing the facing area, the dielectric constant or the facing distance of the electrical coupling capacitance configured between the two is configured. Therefore, according to the present invention, even if the loop length changes depending on the thickness of the arm and the inductance value changes, the capacitance value of the electrical coupling capacitance changes, so that the product is maintained at a constant value. Since the resonance frequency does not shift, the antenna gain can be maintained high.

When the groove is formed in the length direction of the conductor plate constituting the antenna body, it also functions as a slot antenna, so that the directional characteristic of the antenna body is improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of an arm-mounted wireless device according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the wrist-worn radio device shown in FIG.

FIG. 3 is a schematic vertical sectional view of the wrist-worn radio device shown in FIG.

FIG. 4 is a schematic vertical cross-sectional view around a case body of the arm-mounted wireless device shown in FIG.

5 is a perspective view around the clasp of the arm-mounted wireless device shown in FIG. 1. FIG.

FIG. 6 is an exploded view of the clasp shown in FIG.

FIG. 7 is a side view of the clasp shown in FIG.

8 is an explanatory view showing a state in which the band body is connected by the clasp shown in FIG.

9A is a block diagram of an antenna section of the arm-mounted wireless device shown in FIG. 1, and FIG. 9B is an equivalent circuit diagram thereof.

10A is a block diagram of an antenna device different from the wrist-worn radio device shown in FIG. 9, and FIG. 10B is an equivalent circuit diagram thereof.

11 is a block diagram of a circuit block of the wrist-worn radio device shown in FIG.

12A is an explanatory diagram of an electrical coupling capacitance in the arm-mounted wireless device shown in FIG. 1, and FIG. 12B is an explanatory diagram of the electrical coupling capacitance in another state.

13 (a) is an explanatory view showing a change in electrical coupling capacity in the wrist-worn radio device shown in FIG. 1, and FIG. 13 (b) is an explanatory view showing a shape of a conductor plate for realizing the change. Is.

14 (a) to (f) are explanatory views showing another structure of a conductor plate that enables a change in the electric coupling capacitance thereof in the wrist-worn radio device shown in FIG. .

FIG. 15A is an explanatory view showing that the electrical coupling capacitance changes in the wrist-worn radio device according to the second embodiment of the present invention, and FIG. 15B is the shape of the band body for realizing it. FIG.

16 (a) to 16 (f) are explanatory views showing another structure of a conductor plate that enables a change in the electric coupling capacity of the arm-mounted radio device shown in FIG. .

FIG. 17 (a) is an explanatory view showing that the electric coupling capacity changes in the wrist-worn radio device according to the third embodiment of the present invention, and FIG. 17 (b) shows the shape of the band body for realizing it. FIG.

FIG. 18 is a schematic lateral cross-sectional view from the back side of the arm-mounted wireless device according to the fourth embodiment of the present invention.

19 is a schematic vertical sectional view of the wrist-worn radio device shown in FIG.

20 is a block diagram of an antenna unit of the wrist-worn radio device shown in FIG.

21 is a schematic vertical cross-sectional view showing the inside of the case body of the arm-mounted wireless device shown in FIG.

22 is a block diagram showing a circuit configuration of the wrist-worn radio device shown in FIG.

23 is a block diagram showing a circuit configuration different from the circuit configuration of the wrist-worn radio device shown in FIG.

FIG. 24 is a block diagram of a circuit configured inside a case body of the arm-mounted wireless device shown in FIG.

25 is a cross-sectional view showing a mode of use of the clasp of the arm-mounted wireless device shown in FIG.

26A is an explanatory diagram showing the directivity of the arm-mounted wireless device shown in FIG. 18, and FIG. 26B is an explanatory diagram for explaining the difference from that.

27A is an explanatory view showing a state in which the arm-mounted wireless device is left alone in the directivity evaluation of the arm-mounted wireless device shown in FIG. 18, and FIG. FIG. 6 is an explanatory diagram showing the states in which the directivity is evaluated, and (c) is a graph showing the directivity evaluation results in those states.

28 is an explanatory diagram showing a state in which the arm is horizontally extended while the arm-mounted wireless device is attached to the arm in the evaluation of the directivity of the arm-mounted wireless device shown in FIG.

FIG. 29 (a) is an explanatory view showing a state in which the arm-mounted wireless device is left alone in the directivity evaluation of the arm-mounted wireless device shown in FIG. 18, and FIG. FIG. 6 is an explanatory diagram showing the states in which the directivity is evaluated, and (c) is a graph showing the directivity evaluation results in those states.

30 is an explanatory view showing a state in which the arm is bent on the front surface of the body in a state where the arm-mounted wireless device is attached to the arm in the evaluation of the directivity of the arm-mounted wireless device shown in FIG.

31 is an explanatory diagram showing a state in which the arm is bent along the side surface of the body in a state where the arm-mounted wireless device is attached to the arm in the evaluation of the directivity of the arm-mounted wireless device shown in FIG.

FIG. 32 is a schematic cross-sectional view of an arm-mounted wireless device according to an improved example of the fourth embodiment of the present invention.

FIG. 33 is a schematic vertical sectional view of the wrist-worn radio device shown in FIG. 32.

FIG. 34 is a perspective view showing an overall configuration of a conventional wrist-worn radio device.

35 is a block diagram of the wrist-worn radio device shown in FIG. 34.

[Explanation of symbols]

 1,40,46,50,80 ... Warm-mounted radio 2 ... Receiver body 3,52 ... Wrist-mounted band 3L, 52L, 82L ... First band body 3R, 52R , 82R ... Second band body 5, 54, 84 ... Antenna body 5L, 831 ... First conductor plate 5R, 832 ... Second conductor plate 6 ... Electrical Coupling capacitance 10 ... Antenna circuit 15 ... Area changing part 21 ... Exterior case 22 ... Circuit board 23, 56, 86 ... Radio device circuit block 24 ... Antenna input terminal 30, 55・ ・ ・ Band connector part 31 ・ ・ ・ Buckle (middle clasp) 32,532 ・ ・ ・ Metal electrode plate 45 ・ ・ ・ Dielectric constant changing part 47 ・ ・ ・ Thickness changing part 51,81 ・ ・ ・ Case body 53 ・..Conductor plates 53a, 83a, 83b ... Slits 232, 5 9,869 ... Variable capacitor 233, 570 ... Coupling capacitor 441, 451, 461 ... Resin layer 452 ... Air layer 521 ... Inner clasp 522 ... Inner clasp 520 ... ..Resin layer 566 ... Circuit case 551 ... Area change parts H1, H2 ... Magnetic field component E ... Electric field component

Claims (5)

[Claims] 1. A band connector portion, which is fixed to the band body, in which the free end side of the insulating band body is separated and connected so that the band body can be mounted on an arm or the like. A conductor plate forming a loop-shaped antenna body in a state where the band body is connected by a band connector part, and an electrode part provided on the conductor plate and the band connector part depending on a connecting position of the band body. An antenna device for a wireless device, comprising: a resonance frequency compensating unit configured to change a capacitance value of an electrical coupling capacitance formed between the resonance frequency compensating unit and the resonance frequency compensating unit. 2. The resonance frequency compensating means according to claim 1, wherein a facing area between the electrode portion and the conductor plate is changed according to a connection position of the band body to change a capacitance value of the electrical coupling capacitance. An antenna device for a wireless device, comprising: an area changing portion on the side of the conductor plate. 3. The resonance frequency compensating means according to claim 1, wherein the resonance frequency compensating portion changes a dielectric constant between the electrode portion and the conductor plate depending on a connection position of the band body. An antenna device for a wireless device having. 4. The thickness variation part on the band body side according to claim 1, wherein the resonance frequency compensating means changes a facing distance between the electrode part and the conductor plate depending on a connection position of the band body. An antenna device for a wireless device, characterized by: 5. The antenna device for a radio device according to claim 1, wherein a groove is formed in the conductor plate in a length direction thereof.