JP3179696B2 - Antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD OF THE INVENTION

[0002] The present invention relates to an antenna device provided in a portable wireless device such as a portable telephone, and more particularly to an antenna device in which an antenna is mounted so as to be housed in a housing of the portable wireless device.

[0003]

2. Description of the Related Art In a portable wireless device such as a portable telephone which is used while being carried, an antenna protruding from a casing of the portable wireless device is housed in the casing so as to have a shape as compact as possible while moving. ing.

[0004] However, in this type of portable radio, transmission and reception cannot be performed sufficiently when the antenna is housed in the housing, and the reception sensitivity of the calling signal deteriorates. Sometimes I had to pull out the antenna.

In order to solve this drawback, for example, Japanese Patent Application Laid-Open
As disclosed in No. 245603, an antenna device capable of transmitting and receiving even when a rod antenna unit is housed in a housing has been developed.

[0006] This conventional antenna device will be described with reference to FIGS. 11 to 13.

As shown in FIG. 11, a power supply fitting 102 is attached to an upper surface of a housing 101 of a portable wireless device 110, and a rod antenna of the antenna apparatus is inserted through a support hole formed in the power supply fitting 102. The element 103 can come and go in the housing 101.

[0010] As shown in FIG. 12, a spiral helical antenna element 104 is attached to the tip of the rod antenna element 103, and the frequency f at which the rod antenna element 103 and the helical antenna element 104 communicate with each other with the portable wireless device 110. One of the wireless signals
Since the rod antenna element 103 is pulled out of the housing 101 since it has a length of 波長 wavelength, the antenna has a length of 波長 wavelength of the radio signal.

In this state, the rod antenna element 10
The base end of 3 is in electrical contact with the power supply fitting 102, and the power supply fitting 102 is further connected to a transmission / reception circuit (not shown) on the circuit board 106 via the power supply line 105.

When the rod antenna element 103 is housed in the housing 101, the connecting portion between the rod antenna element 103 and the helical antenna element 104 is connected to the power supply fitting 102 as shown in FIG. The helical antenna element 104 acts as a quarter wavelength antenna.

Therefore, even in this state in which the rod antenna element is housed, the radio signal of the frequency f can be transmitted and received.

[0012]

As described above, according to the conventional antenna device, transmission and reception can be performed even when the antenna is housed, but the rod antenna element 103 is connected to the power supply fitting 1.
02 is stored in the housing 101 while being connected to the H.02, and if transmission is attempted from the portable wireless device 110 in this state, a high-frequency signal is radiated also from the rod antenna element 103, resulting in noise and This has an adverse effect on each circuit.

Further, even when receiving in this state, there is a problem that the wavelength of the helical antenna element 104 shifts from 1/4 wavelength due to the influence of the rod antenna element 103, and the receiving sensitivity deteriorates.

For this reason, in the conventional example, as shown in FIG. 14, when the rod antenna element 103 is stored, the base end 103a of the rod antenna element 103 is brought into contact with the grounding piece 107 so that the impedance viewed from the power supply fitting 102 is infinite. As the rod antenna element 10
3 does not function as an antenna.

However, in order to ground the base end 103a of the rod antenna element 103 as described above,
It is necessary to provide an extra ground circuit in addition to the ground piece 107, and the structure becomes complicated.

Further, the rod antenna element 103
Since the upper end is only supported by the power supply fitting 102 at the time of storage, the position of the base end 103a is unstable and
There is a problem that it does not always contact with 07.

Further, as shown in FIG. 12, even when the rod antenna element 103 is pulled out of the housing 101, only one resonance frequency can be obtained. On the other hand, both the receiving sensitivity and the radiation power at the time of transmission could not be improved.

Accordingly, the present applicant has filed a Japanese patent application No.
In No. 97, with the sliding antenna part pulled out,
We have applied for an invention relating to an antenna device that can obtain two resonance frequencies.

The antenna device 120 will be described with reference to FIG. 15. The sliding antenna portion 2 into which the support hole 10 of the power supply fitting 9 is inserted includes a rod antenna 20 and a rod antenna 20.
And a connection fitting 22 fixed to the base end of the rod antenna 20.

A fixed antenna 14 composed of a helical antenna element is attached to the power supply fitting 9, and a contact spring 18 elastically contacting the outer surface of the sliding antenna unit 2 faces the support hole 10. Attached.

The contact spring 18 comes into contact with the position of the insulating coating 11 of the sliding antenna section 2 in a state where the sliding antenna section 2 is pushed in, and the electrical connection with the rod antenna 20 is cut off. Therefore, only the fixed antenna 14 functions as an antenna and is not affected by the rod antenna 20.
On the other hand, when the sliding antenna portion is pulled out, the contact spring 18 makes conductive contact with the connection fitting 22 connected to the base end of the rod antenna 20, and the two kinds of antennas of the rod antenna 20 and the fixed antenna 14 are provided on the power supply fitting 9. Are connected, and two different resonance frequencies corresponding to transmission and reception can be obtained.

However, even in the antenna device 120 configured as described above, only one resonance frequency from the fixed antenna 14 can be obtained when the sliding antenna portion is housed. Therefore, when this antenna device 120 is used for a mobile phone,
If the resonance frequency is adjusted to one of the reception frequency and the transmission frequency, and if the resonance frequency is adjusted to an intermediate frequency between the two, the transmission / reception sensitivity is extremely poor because the fixed antenna 14 is a helical antenna. It was a different thing.

The present invention has been made in order to solve the above-mentioned problems, and has a structure in which an antenna can be housed. In both cases when the antenna is housed and when the antenna is extended, two types of resonance frequencies are used in a portable radio. An object is to provide an antenna device capable of transmitting and receiving.

[0024]

According to a first aspect of the present invention, there is provided an antenna apparatus comprising: a first antenna comprising a helical antenna element covered with an insulating knob;
A second antenna composed of a rod antenna element is insulated from each other, and is electrically connected to the first antenna and a sliding antenna portion continuously provided on the same axis, and is exposed to the outer surface of the sliding antenna portion below the insulating knob. A first movable contact portion;
A second movable contact portion which is electrically connected to the antenna and is exposed at the base end of the second antenna to the outer side surface of the sliding antenna portion; A power supply fitting having a contact spring that elastically makes contact with the outer surface of the sliding antenna part and a helical antenna element, and a fixed connection part at the base end is supplied with electric power by fitting the dynamic antenna part into and out of the housing. A fixed antenna attached to a bracket is provided, and when the sliding antenna section is pushed into the housing, the contact spring contacts at the position of the first movable contact section of the sliding antenna section, and the first antenna and the fixed antenna supply power. When the sliding antenna portion is pulled out of the housing in parallel with the metal fitting, the contact spring contacts at the position of the second movable contact portion of the sliding antenna portion, and the second antenna and the fixed antenna are connected to the power feeding cable. Characterized by electrically connecting in parallel to the.

According to the first aspect of the present invention, the sliding antenna portion is pushed into the housing or pulled out of the housing by being inserted into a support hole of a power supply fitting attached to the housing of the portable wireless device.

A contact spring makes elastic contact with the outer surface of the sliding antenna unit, holds the sliding antenna unit in a pushed or pulled state, and contacts the first movable contact unit of the sliding antenna unit. It contacts one of the second movable contact portions.

In a state where the sliding antenna section is pushed in, the contact spring contacts the first movable contact section electrically connected to the first antenna, and the power supply fitting includes a fixed antenna that is always protruding from the housing and an insulating knob. And the first antenna left outside the housing is electrically connected in parallel. Therefore, the fixed antenna and the first antenna each act as an antenna of the portable wireless device, and can transmit and receive wireless signals of two kinds of frequencies. At this time, the electrical connection between the stored second antenna and the power supply fitting is cut off, and the second antenna is not affected by noise or the like.

Since both the fixed antenna and the first antenna protruding from the housing are constituted by helical antenna elements, they do not protrude greatly from the housing and do not become an obstacle when being carried as a portable wireless device.

With the sliding antenna portion pulled out of the housing, the contact spring contacts the second movable contact portion fixed to the base end of the second antenna, and the power supply fitting always projects from the housing. Fixed antenna and the second pulled out of the housing
The antenna is electrically connected in parallel. Therefore, the fixed antenna and the second antenna function as antennas of the portable wireless device, respectively, and can transmit and receive wireless signals of two different frequencies.

Since the second antenna drawn out of the housing is constituted by a rod antenna element, better sensitivity is obtained in transmission / reception, and a non-grounded 1/2 wavelength or 5/8 which is not biased in directivity. It can be a wavelength antenna.

Further, in the antenna device according to the present invention, a cylindrical insulating cover for covering the outer surface of the fixed antenna is mounted on the power supply fitting, and the insulating knob has a diameter larger than the inner diameter of the insertion hole of the insulating cover. It is characterized in that it is a storage stopper.

Since the fixed antenna constituted by the helical antenna element is covered with the cylindrical insulating cover,
The appearance is not impaired, and the helical antenna element is not deformed by external force.

When the sliding antenna unit is stored, the storage stopper contacts the upper end surface of the insulating cover, the sliding antenna unit does not fall into the housing, and the storage stopper is further contacted with the insulating cover. Thus, it is possible to position the contact spring such that the contact spring is elastically contacted at the position of the first movable contact portion in a state where the sliding antenna portion is pushed in.

Further, in the antenna device according to the third aspect, the second movable contact portion includes a support portion to be inserted into the support hole and a pull-out stopper having a base end of the support portion having an enlarged diameter. When being pulled out, the drawer stopper is brought into contact with the base end face of the power supply fitting.

When pulling out the sliding antenna section from the housing,
The drawer stopper abuts against the base end surface of the power supply fitting, and the sliding antenna section does not fall out of the housing. In addition, the position where the sliding antenna section is pulled out is determined by the contact position, and the contact spring reliably makes conductive contact with the second movable contact section.

Since the support portion of the second movable contact portion is inserted into the support hole, it supports the sliding antenna portion projecting from the housing without play.

Further, in the antenna device according to the fourth aspect, a plurality of portions on the side surface of the cylindrical metal fitting are cut and raised inward to form a contact spring, and the cylindrical metal fitting is fitted into an annular concave groove formed in the inner surface of the power supply metal fitting. It is characterized by having made it.

A plurality of contact springs come into contact with the outer surface of the sliding antenna section from different positions around the sliding antenna section, thereby holding the sliding antenna section without bias, and a plurality of contact springs on the first movable contact section or the second movable contact section. Elastic contact and secure electrical connection.

The cylindrical metal fitting whose contact spring has been cut and raised can be easily attached by fitting it into the annular groove of the power supply metal fitting.

Further, since the cylindrical fitting can be easily attached and detached, the contact spring can be easily replaced when the contact spring is plastically deformed.

Further, in the antenna device according to the fifth aspect, a contact spring is formed by a plurality of tongues integral with the power supply fitting, and the contact spring is cantilevered so as to elastically contact the outer surface of the sliding antenna portion. It is characterized by being supported.

A plurality of contact springs come into contact with the outer side surface of the sliding antenna section from different positions around the sliding antenna section, thereby holding the sliding antenna section without bias, and a plurality of contact springs on the first movable contact section or the second movable contact section. Elastic contact and secure electrical connection.

Since the contact spring is formed integrally with the power supply fitting, the number of parts does not increase and the antenna device can be easily assembled.

[0044]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The same components as those of the antenna device 120 shown in FIG. 15 will be described with the same reference numerals.

As shown in FIG. 7, in the antenna device according to the present embodiment, when the portable radio device 5 is moved, the sliding antenna section 2 is placed inside the housing 4 of the portable radio device while leaving the insulating knob 13. It is in a stored state (hereinafter simply referred to as a stored state). When performing normal communication from this stored state, the insulating knob 13 is pulled up, and the sliding antenna unit 2 is pulled out of the housing 4 (hereinafter simply referred to as an extended state) as shown by a two-dot chain line in FIG. Is what you do.

FIG. 1 is a sectional view of a main part showing this stored state.
FIG. 2 is a sectional view of a main part showing an extended state, and FIG. 3 is a partially exploded sectional view showing each component of the antenna device.

In the figure, reference numeral 6 denotes a transmission circuit of the portable radio,
A circuit board on which high-frequency circuit components (not shown) constituting a receiving circuit, an antenna coupling circuit and the like are mounted;
The antenna coupling circuit is electrically connected to a mounting ring 8 mounted on the upper surface of the housing 4 via a feeder line 7.

A female screw 8 a is threaded on the inner surface of the mounting ring 8, and the power supply fitting 9 is screwed into the mounting ring 8 until the flange portion 9 c provided on the outer surface thereof contacts the housing 4. Attach it. The power supply fitting 9
The support hole 10 is a substantially cylindrical metal fitting having a support hole 10 formed in the center. The support hole 10 is fitted with a slide antenna unit 2 described later, and the slide antenna unit 2 is extended and retracted.
Has the same inner diameter as the outer diameter of the sliding antenna section 2.

An annular groove 9e is formed in the inner surface of the power supply fitting 9 (see FIG. 3), and a cylindrical fitting 17 shown in FIG. 6 is fitted into the annular groove 9e. The cylindrical fitting 17 has a part of the cylinder divided by a slit and is capable of expanding and contracting in the radial direction. The cylindrical fitting 17 is fitted in the annular groove 9e while reducing the diameter of the cylinder.

On the side surface of the cylinder, a plurality of contact springs 18 are cut and raised inwardly at equal intervals on the circumference, and the plurality of contact springs 18 are inserted into the support holes 10 in a sliding antenna portion. The outer surface 2 is elastically contacted from a plurality of different positions.

As shown in FIG. 3, the upper cylindrical portion 9 of the power supply fitting 9 is provided.
In order to support the fixed connection portion 14a of the helical antenna element 14, the outer diameter is made equal to the diameter of the helix of the helical antenna 14, and the externally threaded portion 9b on the outer surface thereof is connected to the helical pitch of the helical antenna element 14. It is adjusted to.

The helical antenna element 14 serves as a fixed antenna in the present invention, and is formed by spirally winding a piano wire having a length of 1/4 wavelength of a reception signal of a portable wireless device. For example, when the mobile wireless device 5 is a mobile phone of a car phone, the reception frequency band is 869 to 894 MHz, and the center frequency f ₁ (881 MHz) is used.
The piano wire is spirally wound so as to resonate in z) to form a 1/4 wavelength antenna. The inner diameter of the spiral is sufficiently larger than the outer diameter of the sliding antenna section 2 so that the sliding antenna section 2 penetrates the helical antenna element 14 without contact.

Reference numeral 19 denotes a cylindrical insulating cover which covers the entire helical antenna element 14 and is made of a synthetic resin such as a hard plastic in order to protect the helical antenna element 14 from external force. The base end portion 19a of the insulating cover 19 is fixed to an attachment cylinder portion 9d having a diameter larger than that of the upper cylindrical portion 9a of the power supply fitting 9 by an adhesive.
Is mounted on the flange portion 9c.

FIG. 5 shows a state in which the insulating cover 19 is attached to the power supply fitting 9 in this manner. As shown in FIG. 5, the support hole 10 of the power supply fitting 9 and the helical antenna element 14 are coaxial. The sliding antenna unit 2 is arranged on a line, and the sliding antenna unit 2 is inserted on the axis.

As shown in FIGS. 3 and 4, the sliding antenna section 2 includes a first antenna 30 composed of a helical antenna element covered with an insulating knob 13 and a rod-shaped rod antenna element 20 serving as a second antenna. Are provided on the same axis, and the first antenna 30 and the second antenna 20 are insulated from each other by the insulating coating 11.

The helical antenna element 14 spirally winds a piano wire, and the rod antenna element 20
Are formed by forming elastic wires in a straight line, and their lengths are adjusted so as to resonate with the frequency of the transmission signal of the portable wireless device. For example, when the portable wireless device 5 is a mobile phone of a car phone, the transmission frequency band is 8
24 to 849 MHz, and its center frequency f ₂ (836
MHz) so as to resonate at (MHz).

The periphery of the helical antenna element 30 is covered with an insulating knob 13 made of synthetic resin except for the base end 30a. The outer diameter of the insulating knob 13 is larger than the inner diameter of the insertion hole 16 of the insulating cover 19 described above.
Even when the sliding antenna section 2 is pushed into the housing 4, the insulating knob 13 abuts on the insulating cover 19 and does not fall into the housing 4. When pulling out the sliding antenna section 2, the insulating knob 13 is gripped and pulled out.

In this embodiment, when forming the insulating knob 13, both are integrally formed by insert molding. However, the insulating knob 13 divided into two so as to enclose the helical antenna element 30 is engaged with each other. You may assemble by other methods, such as combining and assembling.

The base end 30a projects downward on the helical central axis of the helical antenna element 30, and
And is fixed to the connection fitting 3. The connection fitting 3 serves as a first movable contact portion, and is supported by the support hole 10 so as to fit into the support hole 10 of the power supply fitting 9.
Is formed in a cylindrical shape having an outer diameter substantially equal to the inner diameter of the housing, and in a stored state where the insulating knob 13 contacts the insulating cover 19,
The contact spring 18 elastically contacts the outer surface.

A female screw portion 3b is threaded on the bottom surface of the connection fitting 3, and the male screw portion 11a at the upper end of the insulating coating portion 11 is screwed to the female screw portion 3b, so that the insulation coating is provided below the connection fitting 3. The part 11 is connected. Insulation coating 1
Numeral 1 is formed of an insulating elastomer such as hard synthetic rubber, and covers the periphery of the rod antenna element 20 except for a part of the base end 20a.

The rod antenna element 20 is insulated from the helical antenna element 30 serving as the first antenna by the insulating covering portion 11 and its surroundings are insulated and protected. 9 are also insulated. The outer diameter of the intermediate portion of the insulating coating portion 11 is slightly smaller in order to facilitate pulling out or storing the sliding antenna portion 2.

Base end 2 of rod antenna element 20
A connection fitting 22 composed of a support portion 22a and a pull-out stopper 22b is fixed to 0a, and the rod antenna element 20 and the connection fitting 22 are electrically connected.

First, the connection fitting 22 is fixed to the insulating coating portion 1.
1 is covered with the support portion 22a of the connection fitting 22 and caulked together with the rod antenna element 20, and then the base end 20a of the rod antenna element 20 is directly connected to the connection fitting 2
2 and crimp.

The connection fitting 22 serves as a second movable contact portion, and its support portion 22a has an outer diameter substantially equal to the inner diameter of the support hole 10 so as to make elastic contact with the contact spring 18. At the base end side of the connection fitting 22, the diameter of the support portion 22a is enlarged to serve as a pull-out stopper 22b. The outer diameter of the pull-out stopper 22b is equal to the support hole 10 of the power supply fitting 9.
Is larger than the inner diameter of

Therefore, when the sliding knob 2 is pulled out by gripping the insulating knob 13, the pull-out stopper 22b comes into contact with the base end surface of the power supply fitting 9, and the sliding antenna 2 does not come off as it is. The contact spring 18 comes into contact with the connection fitting 22 as the second movable contact portion as the extension position in the extended state (see FIG. 2). In this extended state, the support portion 22a is fitted into the support hole 10, so that the sliding antenna portion 2 protruding from the housing 4 is supported without play.

The operation of the antenna device thus configured in the housed state and the extended state will be described.

As shown in FIG. 1, in the stored state, the insulating knob 13 contacts the insulating cover 19, and the rod antenna element 20 of the sliding antenna unit 2 is stored in the housing 4. At this time, the connecting bracket 3 of the sliding antenna unit 2 is
Since the sliding antenna unit 2 is fitted into the support hole 10 of the power supply fitting 9, the sliding antenna unit 2 is supported without play.

Since the contact spring 18 makes conductive contact with the connection fitting 3 serving as the first movable contact portion, the resonance frequency is applied to the power supply fitting 9 as shown in FIG. a 1/4 wavelength first antenna 30 adjusted to f ₂ ,
Quarter wave adjusted to the reception frequency f ₁ fixed antenna 1
4 are electrically connected to each other. Therefore,
As shown in FIG. 2C, the antenna device including the first antenna 30 and the fixed antenna 14 has a transmission frequency f _2.
(836 MHz) and a two-frequency antenna that resonates at the reception frequency f ₁ (881 MHz).

Since the first antenna 30 and the fixed antenna 14 both protrude outside the housing 4 and their resonance frequencies are adjusted to the transmission frequency and the reception frequency, respectively, the radiated power is large by the first antenna 30. A transmission signal can be output, and good reception sensitivity can be obtained by the fixed antenna 14.

On the other hand, the periphery of the rod antenna element 20 as the second antenna is covered with the insulating cover portion 11, so that there is no conductive contact with the first antenna 30 and the contact spring 18. Therefore, the second antenna 20 is insulated from the power supply fitting 9 and the second antenna 20 in the housing 4 during transmission.
, No high-frequency signal is radiated, and the fixed antenna 14 is not affected even during reception.

When the rod antenna element 20 is located below the power supply fitting 9 in the housed state, there is no danger of contact with the power supply fitting 9. 1
There is no need to cover with 1.

When the insulation knob 13 is grasped from the stored state and pulled out until the pull-out stopper 22b of the connection fitting 22 comes into contact with the base end face of the power supply fitting 9, the connection fitting 22 makes elastic contact with the contact spring 18 as shown in FIG. I do. At this time, the support portion 22a of the connection fitting 3 is connected to the support hole 10 of the power supply fitting 9.
, The sliding antenna portion 2 protruding from the housing 4 is supported without play.

Since the contact spring 18 is in conductive contact with the connection fitting 22 serving as the second movable contact portion, the resonance frequency is applied to the power supply fitting 9 as shown in FIG.ア ン テ ナ wavelength second antenna 20 adjusted to f ₂
And the fixed antennas of the quarter wavelength adjusted to the reception frequency f ₁ are electrically connected to each other. Therefore, even in this extended state, the antenna device including the second antenna 20 and the fixed antenna 14 resonates at the transmission frequency f ₂ (836 MHz) and the reception frequency f ₁ (881 MHz), as shown in FIG. Acts as a two-frequency antenna.

Since both the second antenna 20 and the fixed antenna 14 protrude outside the housing 4 and their resonance frequencies are adjusted to the transmission frequency and the reception frequency, respectively, the radiated power is large due to the second antenna 20. A transmission signal can be output, and good reception sensitivity can be obtained by the fixed antenna 14.

On the other hand, since the first antenna 30 projects in the air while being insulated from the second antenna 20, the first antenna 30 does not affect transmission and reception.

FIG. 9 shows a power supply fitting 24 according to a second embodiment of the present invention.
It is formed in one piece. The contact spring 25 is composed of two opposing tongue pieces having an arc-shaped cross section.
After each of the power supply fittings 24 is inclined downward inward from the lower end face thereof, the leading end thereof is turned outward to smoothly slide the sliding antenna section 2 held by the contact spring 25. .

FIG. 10 shows an antenna device using the power supply fitting 24. When the sliding antenna portion 2 is inserted into the support hole 26 of the power supply fitting 24 configured as described above, the contact spring 25 Since it is inclined to the right, it comes into elastic contact with the outer peripheral surface of the sliding antenna unit 2, makes conductive contact with the connection fitting 3 in the stored state, and makes conductive contact with the connection fitting 22 in the extended state.

Therefore, the same function and effect as those of the first embodiment can be obtained. Further, in the second embodiment, since the contact spring 25 is formed integrally with the power supply fitting 24, the assembly process is simplified without increasing the number of components.

The present invention can be variously modified without being limited to the above embodiment. In the above embodiment,
Although the second antenna 20 is a 波長 wavelength antenna, the second antenna 20 may be a non-grounded 波長 wavelength or ／ wavelength rod antenna element.

The contact spring does not need to be cut and raised in the form of a tongue, as long as it comes into elastic contact with the outer surface of the sliding antenna portion 2. The bulge may be used as a contact spring.

Also, contrary to the above embodiment, the fixed antenna is adjusted so as to resonate at the transmission frequency f ₂ , and the first antenna is adjusted.
Antenna 30 may be adjusted so as to resonate the second antenna 20 at each reception frequency f _1.

[0082]

According to the first aspect of the present invention, when the lot antenna element 20 is stored in the housing 4 of the portable wireless device 5, the first antenna 30 and the fixed antenna 14 protruding from the housing 4 are either Is also constituted by a helical antenna element, so that the portable wireless device 5 is not obstructed when it is accommodated and carried without largely protruding from the housing 4.

Moreover, since the first antenna 30 and the fixed antenna 14 projecting from these housings are electrically connected in parallel to the power supply fitting 9, one of the two antennas is connected to the transmission frequency f _{2 of the} portable radio 5. a,, combined the other to the reception frequency f _1, increases the radiation power of the transmission, can receive sensitivity of the receiver is a good antenna device. Therefore, even in a standby state in which the rod antenna of the portable wireless device 5 is stored, it is possible to perform good transmission and reception communication.

Further, in the stored state, the second antenna 2
0 is insulated by the insulating coating portion 11, so that the high-frequency signal is radiated from the second antenna 20 at the time of transmission and does not become a noise to adversely affect each circuit in the housing 4. 20 has no effect,
The receiving sensitivity does not deteriorate.

On the other hand, even in the extended state, the two antennas, the second antenna 20 and the fixed antenna 14, are electrically connected to the power supply fitting 9, so that one of the two antennas is connected to the transmission frequency f _{2 of the} portable wireless device 5. And the other receives the frequency f ₁
According to the above, it is possible to provide an antenna device having high transmission radiation power and good reception sensitivity for reception.

In particular, the second antenna 2 protruding from the housing 4
0 is composed of a rod antenna element,
The second antenna 20 can be a non-grounded antenna without biased directivity as a half-wavelength or 5 / 8-wavelength antenna.

According to the second aspect of the present invention, the fixed antenna 1
4 is covered with the cylindrical insulating cover 19, so that it is not deformed by an inadvertent external force.

Further, the contact spring 18 is brought into contact with the first movable contact portion 3 at a position where the insulating knob 13 comes into contact with the upper end surface of the insulating cover 19, so that the first movable contact portion 3 can be reliably held in the housed state.
The antenna 30 can be electrically connected to the power supply fitting 9.

Further, since the insulating knob 13 functions as a storage stopper, the sliding antenna 2 does not fall into the housing 4.

According to the third aspect of the present invention, the contact spring 18 is brought into contact with the second movable contact portion 3 at the position where the pull-out stopper 22b of the connection fitting 22 contacts the base end face of the power supply fitting 9. 2nd antenna 2 surely in the extended state
0 can be electrically connected to the power supply fitting 9.

Further, when the sliding antenna section 2 is pulled out, the pull-out stopper 22b comes into contact with the base end face of the power supply fitting 9, so that the sliding antenna section 2 does not fall out of the housing 4.

According to the fourth aspect of the present invention, a plurality of contact springs 1 are provided on the outer surface of the sliding antenna section 2 from different positions around the sliding antenna section.
Because the elastic contact 8 is provided, the sliding antenna section 2 can be held without bias and the conductive contact is reliably made with the first movable contact section 3 or the second movable contact section 22.

The cylindrical metal fitting 1 with the contact spring 18 cut and raised.
7 can be easily attached by fitting it into the annular groove 9e of the power supply fitting 9.

Further, since the attachment / detachment of the cylindrical fitting 17 is easy,
When the contact spring 18 is plastically deformed, the contact spring 1
8 can be exchanged.

According to the fifth aspect of the present invention, a plurality of contact springs 2 are provided on the outer surface of the sliding antenna 2 from different positions around the sliding antenna 2.
5 makes contact, the sliding antenna section 2 can be held without bias, and the first movable contact section 3 or the second movable contact section 22 is reliably brought into conductive contact.

Since the contact spring 25 is formed integrally with the power supply fitting 24, the number of parts does not increase and the antenna device can be easily assembled.

[0097]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a stored state of an antenna device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing an extended state of the antenna device.

FIG. 3 is a partially exploded sectional view showing each component of the antenna device.

FIG. 4 is a partially exploded perspective view illustrating the assembly of the first antenna 30.

FIG. 5 is a cross-sectional view showing a state where an insulating cover 19 is attached to the power supply fitting 9;

FIG. 6 is a perspective view of a cylindrical fitting 17;

FIG. 7 is a front view of the portable wireless device 5.

8A is an equivalent circuit diagram of the antenna device 120 of the portable wireless device 5 in a housed state, FIG. 8B is an equivalent circuit diagram of an extended state, and FIG. 8C is a frequency characteristic diagram. .

FIG. 9 is a perspective view of a power supply fitting 24 according to a second embodiment of the present invention.

FIG. 10 is a partial cross-sectional view showing a state in which a sliding antenna unit 2 is fitted into a power supply fitting 24 according to a second embodiment.

FIG. 11 shows a portable wireless device 11 equipped with a conventional antenna device.
FIG.

FIG. 12 is a sectional view showing an extended state of a conventional antenna device.

FIG. 13 is a cross-sectional view showing a stored state of the antenna device.

FIG. 14 is a schematic diagram showing a state in which the ground piece 107 is in contact with the rod antenna element 103 in the housed state.

FIG. 15 is a cross-sectional view of a main part of an antenna device that can obtain two resonance frequencies in an extended state.

[Explanation of symbols]

2 Sliding antenna part 3 First movable contact part (connection metal fitting) 4 Housing 5 Portable wireless device 9, 24 Power supply metal fitting 9e Annular concave groove 10 Support hole 11 Insulation coating part 13 Insulation knob 14 Fixed antenna (helical antenna element) 14a Fixed Connecting part 16 Insertion hole 18, 25 Contact spring 19 Insulating cover 20 Second antenna (rod antenna element) 20a Base end 20b Upper end 22 Second movable contact part (connecting fitting) 22a Support part 22b Pull-out stopper 30 First antenna ( Helical antenna element)

Claims (5)

(57) [Claims] 1. A first antenna (30) comprising a helical antenna element covered with an insulating knob (13) and a second antenna (20) comprising a rod antenna element.
Are electrically insulated from each other, and are electrically connected to the first antenna (30) and the insulating knob (13).
Exposed on the outer surface of the sliding antenna section (2) below
The movable contact part (3) is electrically connected to the second antenna (20), and the second antenna (2)
A second movable contact portion (22) exposed on the outer surface of the sliding antenna portion (2) at the base end portion (20a) of the portable wireless device (5), and is attached to the housing (4) of the portable wireless device (5). The sliding antenna part (2) is inserted into the support hole (10).
Into the housing (4) so that it can
A power supply fitting (9) (24) having contact springs (18) (25) elastically in contact with the outer surface of the sliding antenna part (2), and a helical antenna element, and a fixed connection part (14a) at a base end is provided. A fixed antenna (14) attached to the power supply fittings (9) and (24), and when the sliding antenna section (2) is pushed into the housing (4), the contact springs (18) and (25) slide. The first antenna (30) and the fixed antenna (14) are electrically connected in parallel to the power supply fitting (9) in contact with the first movable contact portion (3) of the antenna portion (2), and the sliding antenna portion ( When 2) is pulled out of the housing (4), the contact springs (18) and (25) come into contact at the position of the second movable contact portion (22) of the sliding antenna portion (2), and
An antenna device, wherein an antenna (20) and a fixed antenna (14) are electrically connected in parallel to a power supply fitting (9). 2. A fixed antenna (1) on a power supply fitting (9).
4) Attach the cylindrical insulating cover (19) covering the outer surface, and make the insulating knob (13) larger than the inner diameter of the insertion hole (16) of the insulating cover (19) to store the sliding antenna part (2). The antenna device according to claim 1, wherein the antenna device is a stopper. The second movable contact portion (22) includes a support portion (22a) fitted into the support hole (10) and a support portion (22).
The drawer stopper (22) having the base end side of (a) enlarged in diameter.
3. The method according to claim 1, wherein when the sliding antenna portion is pulled out, the pull-out stopper is brought into contact with the base end surface of the power supply fitting. Antenna device. 4. A plurality of side surfaces of a cylindrical metal fitting (17) are cut and raised inward to form a contact spring (18), and a cylindrical groove (9e) formed in the inner surface of the power supply metal fitting (9) is formed into a cylindrical shape. The antenna device according to any one of claims 1 to 3, wherein a fitting (17) is fitted. 5. A contact spring (25) is formed by a plurality of tongues integral with a power supply fitting (24), and power is supplied so that the contact spring (25) elastically contacts the outer surface of the sliding antenna section (2). 2. A cantilevered support for a metal fitting (24).
The antenna device according to any one of claims 3 to 3.