JPH08335813A - Housing structure for draw-out type antenna - Google Patents

Abstract

PURPOSE: To provide a housing structure of a draw-out type antenna which can improve the antenna efficiency in its small size for a portable radio communication device and also secures the smooth draw-out/housing operations of the antenna. CONSTITUTION: A connection terminal 13 is loaded into a through hole 11a of a easing 11, and a protection tube 14 is attached to the terminal 13. The inner circumference surface of the tube 14 is coated with fluororesin and bent in a prescribed shape. An antenna 12 includes a rod part 12a using an elastic resin and is bent according to the shape of the tube 14 when it is housed. Thus the distance (h) between both ends of the antenna 12 is smaller than the antenna length L, and the size of the easing 11 can be reduced. When the antenna 12 is moved, a stopper 12d touches the inner circumference surface of the tube 14 and partly scrapes the surface to generate the fluororesin powder. This powder gets into a part between the stopper 12d and the tube 14 and functions as a roller to secure smooth movements of the antenna 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retractable antenna housing structure, and more particularly to a structure for housing a transmitting / receiving antenna used in a portable wireless communication device or the like. is there.

[0002]

2. Description of the Related Art Currently, cordless telephones, mobile telephones,
A linear antenna such as a whip antenna is generally used as a transmitting / receiving antenna used in a portable wireless communication device such as a PHS that can be carried around. In addition, in order to improve portability while improving the performance (efficiency) of the antenna, the antenna can be housed in the housing. That is, during standby, the antenna is housed in the housing to improve portability. On the other hand, when making a call using such a portable wireless communication device, the antenna is pulled out to secure a predetermined antenna length. Signals are sent and received in this state.

As a storage structure for such a retractable antenna, for example, a protective tube is installed in the housing in order to prevent the stored antenna from coming into contact with other electronic parts mounted in the housing to cause conduction or short circuit. There is a structure in which the antenna is housed inside the protective tube.

As an example, as shown in FIG. 4, a cylindrical connecting terminal 3 is mounted in a mounting hole of an antenna 2 formed on an upper end surface of a casing 1 of a portable wireless communication device, and the connection is made. The upper end of a protective tube 4 whose both ends are open is fixed to the terminal 3. Then, the other end of the protective tube 4 is fixed at a predetermined position in the housing 1 by a locking member (not shown) or the like, and is arranged linearly as shown.

In the antenna 2, a disk-shaped antenna top 2b is attached to the upper end of a rod portion 2a having a predetermined length which determines the antenna efficiency, and a conductor portion 2c which is electrically connected to the connection terminal 3 is attached to the lower end of the rod portion 2a. In addition, a disk-shaped stopper 2d is provided at the lower end of the conductor portion 2c.

The outer diameter of the conductor portion 2c is set to be substantially equal to the inner diameter of the connection terminal 3, and both of them coincide with each other in the pulled-out state. The outer diameter of the rod portion 2a is set to be sufficiently smaller than the inner diameter of the connection terminal 3 so that the rod portion 2a can move smoothly when it is pulled out and stored.

Further, the operation of pulling out and storing the antenna 2 is carried out along the axial direction of the rod portion 2a and linearly moved. Further, since the protective tube 4 serves to insulate the antenna 2 from the electronic components as described above, the inner diameter of the protective tube 4 is set to the stopper of the antenna 2 in order to smoothly move the antenna 2. It is set sufficiently larger than the outer diameter of 2d. As a result, when the antenna 2 is pulled out (or stored), the stopper 2
d does not get caught on the inner peripheral surface of the protective tube 4,
The smooth movement of the antenna 2 is ensured.

Further, as described above, the antenna 2 merely moves linearly in the protective tube 4 in the vertical direction (axial direction of the rod portion 2a) and does not contact the inner peripheral surface of the protective tube 4, so the protective tube 4 For the material, PVC (vinyl chloride), PE (polyethylene) or the like, which is inferior in durability but is inexpensive, is used.

[0009]

However, the above-mentioned conventional retractable antenna housing structure has the following problems. That is, in the portable wireless communication device,
Although miniaturization is required in order to improve convenience of carrying, as described above, when the antenna 2 is configured by one rod portion 2a that does not expand and contract, the housing 1 of the housing 1 in the antenna housing direction is not provided. The length (height) cannot be less than or equal to the length of the antenna 2. Since the optimum length of the antenna 2 is determined based on the frequency to be transmitted / received, when priority is given to downsizing specifications, the length of the antenna 2 is shortened while allowing reduction in antenna efficiency. Will correspond. However, in reality, there are often demands for both miniaturization and improvement of quality / characteristics, and the above-mentioned countermeasures for reducing the antenna efficiency are not preferable. Moreover, there is a limit to the shortening of the antenna length, and if the antenna 2 is further shortened in order to further reduce the size, it may not be able to function as an antenna.

Therefore, the present inventor has been accommodating the miniaturization of a portable radio communication device or the like for a long time, and the accommodating of the above-described linear antenna, which has been standardized by a person skilled in the art, has been standardized. Breaking down the technical idea of structure,
A structure was considered in which the rod portion 2a of the antenna 2 is housed in the housing 1 while being curved and bent. This makes it possible to make the length of the housing 1 in the housing direction shorter than the entire length of the antenna 2 by the amount of the curved shape.

However, it has been found that simply bending the conventional protective tube 4 and installing it in the housing 1 poses the following problems and cannot be put to practical use. That is, when the antenna 2 is pulled out and used, the rod portion 2a extends linearly, and when it is stored, it is necessary to bend it into a predetermined shape. Therefore, the antenna 2 needs to have an elastic restoring force (self-restoring function), which can be sufficiently dealt with by the elastic force of the whip antenna formed using the current shape memory alloy.

However, while the antenna 2 is being pulled out and housed, the stopper 2d of the antenna 2 comes into contact with the inner peripheral surface of the bent protective tube, and the contact friction with the protective tube increases, so that the antenna is housed. I cannot pull out smoothly.

Further, the protective tube 4 made of PVC is weak in strength, and even if the protective tube 4 is curved and arranged in the housing 2, the elastic restoring force of the antenna 2 should be maintained and the linear shape should be maintained. The force to
There is a possibility that the antenna 2 cannot be housed in a curved shape along the curved shape of the protection tube 4.

Further, in the conventional retractable antenna storage structure, the conductor portion 2c and the contact terminal 3 are in agreement with each other to maintain a stable state when the antenna 2 is completely pulled out, but during storage or during movement between them. Since the outer diameter of the rod portion 2a is smaller than the inner diameter of the contact terminal 3 and the outer diameter of the stopper 2d is smaller than the inner diameter of the protective tube 4, the antenna 2 is rattled and cannot be held in a predetermined stationary state.

Further, since the antenna 2 rattles as described above, even if the inner diameter of the protective tube 4 is set larger than the outer diameter of the stopper 2d, the stopper 2d actually moves in an oblique direction and the stopper 2d is moved. It contacts the inner peripheral surface of the protective tube 4. Then, since PVC is fragile, it is scraped by the stopper 2d, and shavings are generated.
Then, the shavings are scattered outside the protective tube 4, that is, inside the housing 1 from the lower end open portion of the protective tube 4. Further, since PVC is an insulator, there is a problem that if it penetrates into the contacts of switches, it causes conduction failure.

The present invention has been made in view of the above background, and an object of the present invention is to solve the above problems and to improve the antenna efficiency of a portable radio communication device or the like and to reduce the size thereof. In addition, the antenna can be pulled out or stored smoothly, no rattling occurs when the antenna is pulled out or stored, and even if the material forming the protective tube is scraped, shavings are removed. An object of the present invention is to provide a retractable antenna storage structure that does not adversely affect electronic components and the like in the housing even if it occurs.

[0017]

In order to achieve the above-mentioned object, in a retractable antenna housing structure according to the present invention, a rod-shaped antenna is provided through a through hole formed at a predetermined position of a housing containing a predetermined circuit. Is housed in the housing, and the housed antenna part is inserted into a protective tube arranged in the housing. It is made of a material that has elasticity and is elastically recoverable.
At least the inner peripheral surface of the protection tube is made of a material having a low friction coefficient, and the shape thereof is bent and / or curved to a predetermined shape. Then, the outer shape of the guide member provided at a predetermined position of the portion of the antenna accommodated in the protective tube and the inner shape of the protective tube are substantially matched. Further, a closing means for closing the end of the protective tube that does not face the through hole is provided (claim 1).

Preferably, a fluorine resin is used as the material having the low friction coefficient (claim 2). Furthermore, in addition to the configuration of claim 1 or 2, it is more preferable to provide a locking member having a contact surface capable of contacting the outer peripheral edge of the antenna in the vicinity of the through hole (claim 3).

Here, having the elasticity as a condition of the material forming the antenna and being self-supporting means that the antenna can be bent along the shape of the bent / curved protective tube,
In addition, it means that it has an elastic force to the extent that it can return to its original state (generally linear) when it is pulled out from the protective tube and no longer receives external force. Therefore, it is relatively determined in relation to the strength of the protective tube.

In the case of the linear antenna, as described in detail in the embodiment, the antenna head and the internal circuit are electrically connected to both ends of the rod portion having a predetermined length for exhibiting the function as a normal antenna. The present invention is intended to bend / bend the antenna along the shape of the protective tube. Therefore, at least while bending the antenna inside the protective tube. It just needs to be able to be stored in.
Therefore, it is not necessary to form all of the antenna with the above-mentioned predetermined material (shape memory alloy in the embodiment), and the antenna may be used at least at a position necessary for being housed in the protective tube. And, as an example, it is to form the rod portion of a predetermined length that determines the performance of the above-mentioned antenna with the above-mentioned predetermined material (of course, it is not hindered that all are made of such a material).

The low coefficient of friction in the present invention may be a coefficient of friction such that when the guide member comes into contact with the inner peripheral surface of the protective tube, the guide member does not get caught there and become immovable. The shape of the contact surface of the guide member,
An appropriate material is selected depending on the material and the angle at which they come into contact (depending on the degree of bending / bending of the protective tube).
However, it is necessary that the material is such that the inner peripheral surface is scraped by the above movement to generate powder. In any case, when the fluorine-based resin is used as in claim 2, the condition is satisfied.

The guide member has a function of contacting the inner peripheral surface of the protective tube and moving the antenna along the diameter of the protective tube. At the same time, the guide member is made of a material having a low coefficient of friction. It also has the function of cutting off a part. Therefore, regarding the material and the shape,
It is necessary to make it possible to scrape the inner peripheral surface having a low friction coefficient. In the embodiment, the stopper integrally formed on the lower end side of the antenna is also used as the guide member,
Although the number of parts is reduced, it may be formed separately from the stopper.

[0023]

When the antenna is stored in the protective tube, the antenna bends along the shape of the protective tube. Therefore, the distance between both ends of the antenna in the housed state is shorter than the total length of the antenna, so that the length of the housing can be made equal to or less than the antenna length. Further, when the antenna is pulled out, the biasing force (reaction force against the elastic force of the antenna) received from the protective tube is released, so that the antenna elastically returns to its original state (usually linear). Therefore, the antenna efficiency is increased by setting the antenna length to a length that matches the frequency band for transmission and reception.

When the antenna is housed in the protective tube or pulled out from the protective tube,
The guide member formed on the antenna comes into contact with the inner peripheral surface of the protective tube, causing friction between the guide member and the inner peripheral surface of the protective tube. When the antenna is moved in this state, the guide member rubs the inner peripheral surface of the protective tube and scrapes off a part thereof to generate powder.

Since the outer shape of the guide member and the inner shape of the protective tube are almost the same, the generated powder accumulates on the upper portion of the guide member. Then, as the antenna moves, the powder enters the gap between the guide member and the inner peripheral surface of the protective tube, and exhibits the same function as that of "rollers" and "balls" of the bearing. Reduces contact resistance. Since powder is generated every time the antenna is pulled out / stored, the more it is used, the better the slippage when the antenna moves.

Further, although the position of the generated powder moves to the lower side of the guide member, since the protective tube is closed by the closing means, the powder remains in the protective tube and does not scatter in the housing.

When a fluorine-based resin is used as the material forming the inner peripheral surface of the protective tube, the condition of low friction coefficient is satisfied, and the particle size and shape of the powder generated by scraping is the above-mentioned "roller". Since it is suitable for exerting the functions such as, and has a certain degree of strength, it is possible to configure a single body by adjusting the wall thickness. Further, since the resin coating can be easily performed, the same action and effect can be exhibited by forming the shape of the protective tube using a material that can easily form a bent shape and coating at least the inner surface of the tube. Since such a coating technique is generally known as so-called Teflon (registered trademark) processing, it can be easily performed.

Further, since the guide member has substantially the same shape as the inner shape of the protective tube, when the locking member is provided as in claim 3, the locking member makes contact with the outer peripheral surface of the antenna,
Horizontal direction of antenna (direction orthogonal to the axial direction of antenna)
It is supported so that it does not shift to. Therefore, since the antenna is supported by the above two points, rattling of the antenna during movement of the antenna or during storage is eliminated.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a retractable antenna storage structure according to the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a first embodiment of a retractable antenna storage structure according to the present invention. As shown in the figure,
Internal circuits for communication such as portable wireless communication devices
A through hole 11a is formed and opened at a predetermined position of an upper end surface of a housing 11 containing various electronic components, and an antenna 12 is inserted and arranged in the through hole 11a so as to be axially movable. Then, in the through hole 11a, a cylindrical connecting terminal 13 having upper and lower open ends is mounted, and the connecting terminal 13 and the through hole 11a are arranged concentrically around the antenna 12. .

As the antenna 12, a whip antenna is used as in the prior art, and its structure is a rod-shaped rod portion 12a having a small diameter and a predetermined length, an antenna top 12b formed at the upper end of the rod portion 12a, and a rod. A conductor portion 12c formed at the lower end of the portion 12a and the conductor portion 12c
And a stopper 12d formed on the bottom surface of the. The rod portion 12a is made of a material that has elasticity, is elastically deformable, and has a self-restoring function. For example, a shape memory alloy is used. Although not shown, the periphery thereof is covered with an insulator (coating).

On the other hand, the connection terminal 13 has a flange portion 13a protruding outward at the upper end thereof, and is securely fixed to the housing 11 via the flange portion 13a. Further, the diameter of the upper end of the hole 13b is reduced and a locking piece 13c is integrally formed. The locking piece 13c is formed over the entire circumference of the hole 13b. And
The connection terminal 13 is electrically connected to the internal circuit.

The relative dimensions of the connecting terminal 13 and the components of the antenna 12 are as follows. First, the outer diameter of the rod portion 12a and the locking piece 13c
The inner diameters of are set to be almost equal. Along with this, the connection terminal 13 may be entirely formed of metal as in the conventional case, but since the rod portion 12a and the locking piece 13c come into contact with each other, in order to suppress damage to the contact portion as much as possible. Alternatively, for example, the connection terminal 13 may be molded of resin or the like, and a lead piece or the like that is electrically connected to the conductor portion 12c of the antenna 12 may be mounted on the inner peripheral surface of the hole 13b.

Further, the antenna top 12b is formed so that its outer diameter is larger than the inner diameter of the hole 13b formed in the connection terminal 13 (at least the inner diameter of the locking piece 13c). As a result, when storing the antenna 12,
The antenna top 12b is locked by the connection terminal 13 so that the antenna 12 does not enter the inside of the housing 11 too much.

The conductor portion 12c is formed to have an outer diameter substantially equal to the inner diameter of the hole portion 13b formed in the connection terminal 13, and when the antenna 12 is completely pulled out, the conductor portion 12c is formed in the hole portion 13b. It is inserted and electrically and mechanically connected to the connection terminal 13. Then, the rod portion 12a and the internal circuit are electrically connected via the connection terminal 13 to enable transmission / reception of signals.

The outer diameter of the stopper 12d is the same as that of the connection terminal 13
The inner diameter of the hole 13b is larger than that of the hole 13b so that the antenna 12 is not pulled out too much when the antenna 12 is pulled out, as shown in FIG.

Further, the protective tube 14 is attached to the lower portion of the connection terminal 13 (the portion protruding into the housing 11). That is, the connection terminal 13 is inserted and fixed in the upper end 14 a of the protective tube 14. The antenna 12 described above is housed in the protective tube 14.

Here, in the present invention, the protective tube 14 is
At least the inner peripheral surface of the protective tube 14 is made of a material having a low coefficient of friction, and is bent into an appropriate shape.
The distance h between a and the lower end 14b was set shorter than the total length of the tube. Further, the protection tube 14 is positioned and fixed at a predetermined position in the housing 11 by the ribs 15 formed on the inner peripheral surface of the housing 11 while maintaining the bent shape.

The protective tube 14 will be described in more detail. In this embodiment, a fluororesin such as Teflon (registered trademark) is used as a material having a low friction coefficient, and more specifically, PTFE (tetrafluoroethylene resin) is used. ), FEP (tetrafluoroethylene-6-fluoropropylene copolymer resin), PF
A (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin), ETFE (tetrafluoroethylene-ethylene copolymer resin) or the like can be used. These resins have the lowest level static friction coefficient in solids, the smaller the coefficient of static friction as the load increases, the more excellent self-lubricating property, and the more excellent abrasion resistance.
It is one of the most suitable materials in view of the operation principle (action) described later.

The shape of the protective tube 14 is as follows.
A straight tube is bent at two places,
The upper end 14a side and the lower end 14b side are formed in a linear shape orthogonal to the upper end surface of the housing 11, and both parts are connected by an inclined intermediate portion 14c. Further, by increasing the wall thickness of the protective tube 14, desired strength can be exerted, and the stopper 12 can be used even when the antenna is housed.
Even if d hits the side of the intermediate portion 14c or the lower end 14b and urges the inner peripheral surface, the predetermined bending shape can be maintained without being excessively deformed due to the urging force.

Further, the protective tube 14 is not composed of only the fluorocarbon resin as described above, but is double (or multiple) in which the inner peripheral surface of the cylindrical body having a desired strength is coated with the fluorocarbon resin. A cylindrical structure may be used.

Further, in the present invention, the inner diameter of the protective tube 14 is made substantially equal to or slightly larger than the outer diameter of the stopper 12d. As a result, the stopper 12d comes into contact with the inner peripheral surface of the protective tube 14 at a predetermined pressure while the antenna 12 is moving. Along with this, the upper and lower ends of the outer peripheral surface of the stopper 12d are rounded to reduce the contact resistance with the protective tube 14.

On the other hand, a bottom lid 16 as a closing means is attached to the lower end 14b of the protective tube 14 to close the lower side of the protective tube 14. The bottom lid 16 can be attached by various methods such as adhesive fixing, or by forming a threaded portion on the inner peripheral surface of the bottom lid 16 and the outer peripheral surface of the protective tube 14 and fastening the threaded portion. In any case, the bottom lid 16 does not easily come off from the protective tube 14, and a passage that connects the internal space of the protective tube 14 and the internal space of the housing 11 is provided. It is preferable not to provide (gap).

Next, the operation of the pull-out antenna having the above-mentioned structure will be described in detail. First, as shown in FIG. 1A, since the antenna 12 has elasticity and the protective tube 14 has appropriate rigidity, almost the entire length of the antenna 12 is inside the protective tube 14. When housed, the rod portion 12a is bent according to the shape of the protective tube 14.

On the other hand, since the elasticity of the antenna 12 is self-supporting due to the elastic restoring force, when the antenna 12 is completely pulled out, the reaction force from the protective tube 14 is not received. As shown in B), the rod portion 12a elastically returns to a linear shape. Then, the length L in such a linear shape becomes a length suitable for the frequency of transmission and reception, and this is the end portion 14 of the protection tube 14.
It is longer than the distance h between a and 14b. As a result, the housing 1
The height of 1 (the length in the housing direction of the antenna 12) can be made shorter than the length of the antenna 12, and the housing 11 can be downsized while keeping the antenna efficiency in a desired state.

When the antenna 12 is pulled out or stored, since the protective tube 14 is formed in a bent shape, when the antenna 12 is moved in the axial direction, the stopper 12d hits the inner peripheral surface of the protective tube 14. , Press in a predetermined direction. Since the rod portion 12a of the antenna 12 is made of an elastic material such as a shape memory alloy, the rod portion 12a is elastically deformed by the reaction force from the protective tube 14. This causes the rod portion 12a to bend along the shape of the protective tube 14 as described above.

Further, since the protective tube 14 is made of fluorine resin having a low coefficient of friction, and the upper and lower ends of the side surface of the stopper 12d are rounded, the frictional resistance at the time of contact is reduced, so that the protective tube 14 can be moved during movement. Stopper 12d
Can be moved smoothly without being caught in the protective tube 14.

Moreover, since the protective tube 14 is made of fluorine resin, it has some hardness, but the material (metal) of the stopper 12d formed on the antenna 12 is stronger. Therefore, when the stopper 12d moves while coming into contact with the inner peripheral surface of the protective tube 14, the periphery of the stopper 12d slightly scrapes the inner peripheral surface of the protective tube during the movement, and powder 17 is generated (see FIG. 2).
Then, the powder 17 increases every time the antenna 12 is pulled out (or stored) and accumulates on the stopper 12d.

Then, as shown in FIG. 7B, since the powder 17 is a very fine particle, a small amount of the powder 17 enters the slight gap between the inner peripheral surface of the protective tube 14 and the stopper 12d. And the powder 17 that has entered is the "roll"
Also, the "ball" function of the bearing is exerted, and the friction generated between the stopper 12d and the inner peripheral surface of the protective tube 14 is further reduced. That is, the user can move the antenna more smoothly by repeatedly pulling out (or storing) the antenna, and the operability is improved as the antenna is used.

Further, the powder 1 generated as described above
Part of 7 moves below the stopper 12d and reaches the lower end 14b of the protective tube 14, but since the bottom lid 16 is attached and closed at this portion, the powder 17
However, it does not leak to the outside of the protective tube 14 and enter a predetermined circuit provided inside the housing 11 to cause a failure.

Further, since the inner diameter of the locking piece 13c of the connection terminal 13 and the outer diameter of the rod portion 12a of the antenna 12 are made substantially equal to each other, there is almost no gap between them, and the powder 17 generated above is used as the connection terminal. Leakage to the outside through the hole 13b of 13 is also suppressed as much as possible. Therefore, the surroundings are not polluted and the scraped powder 17 can be used efficiently and effectively.

Further, since there is almost no gap between the rod portion 12a and the locking piece 13c, and there is almost no gap between the stopper 121d and the protective tube 14, the antenna 12 is supported at two points. No rattling even when moving or storing.

FIG. 3 shows a second embodiment of the present invention.
In the present embodiment, unlike the above-mentioned embodiment, the protective tube 14 'is largely curved, and the bent portion of the intermediate portion 14'c is arcuate (center angle is 90 degrees). As a result, the upper end 14'a side of the protective tube 14 'extends in the direction orthogonal to the upper end surface of the housing 11', and the lower end 14'b.
The side extends in a direction parallel to the upper end surface. Therefore, the distance h'between the upper end 14'a and the lower end 14'b is determined by the antenna 12
Can be very short compared to the total length of (about half),
It is possible to further reduce the size of the housing 11 '. Since the other configurations, functions and effects are the same as those of the first embodiment described above, the same reference numerals are given and the description thereof is omitted.

In each of the above-mentioned embodiments, the bottom tube 16 formed separately from the protection tube 14 is used to close the lower end of the protection tube 14. However, the present invention is not limited to this, and the protection tube is not limited to this. 14 itself may be closed and closed. In such a case, the protection tube 14 also serves as a closing means.

Although the locking piece 13c is integrally provided on the inner circumference of the upper end of the connection terminal 13, a locking member formed separately from the connection terminal 13 may be attached. In that case, the shape of the locking member is preferably an endless shape (the outer shape is arbitrary) having an inner peripheral edge having an inner diameter substantially equal to the outer diameter of the antenna rod 12a. This is preferable because the effect of prevention and the effect of supporting the antenna 12 can be exhibited at the same time, but in the case of exhibiting only the supporting function, it may be partially cut out or composed of a plurality of members.

[0055]

As described above, in the retractable antenna storage structure according to the present invention, the guide member formed on the antenna is brought into contact with the protective tube, and the antenna is pulled out (or stored) several times. By causing the generated powder to enter the contact portion between the guide member and the protective tube, it is possible to reduce friction at the contact portion between the antenna and the protective tube.

Therefore, since a bent / curved protective tube can be used to house at least a part of the antenna in a bent / curved state in the housing, the antenna length should be set in consideration of antenna efficiency. The length of the housing is less than or equal to the antenna length, and the size is reduced to the desired length.
A device with good portability can be manufactured.

Moreover, as the movement of the antenna is repeated, powder for improving the slip is generated, and the operability is improved as the antenna is used. Then, the generated powder stays in the protective tube by the closing means, and thus scatters in the housing,
It can be used stably for a long time without adversely affecting the internal circuit. That is, in the present invention, by positively utilizing the phenomenon that has been recognized as a conventional defect that powder is generated when the protection tube is scraped, it is possible to improve the antenna efficiency and reduce the size, which cannot be solved conventionally. You will be able to solve contradictory issues at the same time.

In the case of the third aspect of the invention, the antenna is held at two points, that is, the installation position of the guide member and the vicinity of the through hole (locking member installation position) provided in the housing. A stable state with no sideways movement is maintained and does not rattle during movement or storage. Therefore, mechanical / structural durability is also improved.

[Brief description of drawings]

FIG. 1A is a sectional view showing a retractable antenna storage structure according to a first embodiment of the present invention when the antenna is stored. FIG. 3B is a cross-sectional view showing an antenna withdrawn in the embodiment of the retractable antenna storage structure according to the present invention.

FIG. 2A is an enlarged cross-sectional view showing a stopper portion of the antenna. (B) is an enlarged sectional view thereof.

FIG. 3 is a sectional view showing a second embodiment of the retractable antenna storage structure according to the present invention.

FIG. 4A is a cross-sectional view showing a conventional retractable antenna storage structure. (B) is an enlarged sectional view thereof.

[Explanation of symbols]

 11, 11 'Housing 12 Antenna 12d Stopper 13 Connection terminal 13c Locking piece 14, 14' Protective tube 16 Bottom lid 17 Powder

Claims (3)

[Claims] 1. A rod-shaped antenna can be housed in the housing through a through hole formed at a predetermined position of a housing containing a predetermined circuit, and the housed antenna portion is arranged in the housing. In the retractable antenna storage structure that is inserted into the protective tube, the antenna is made of a material that has elasticity and is elastically restored so as to be self-supporting, and at least the inner peripheral surface of the protective tube is made low. The outer shape of the guide member, which is made of a material having a friction coefficient, is bent and / or curved in a predetermined shape, and is provided at a predetermined position of a portion of the antenna to be housed in the protection tube, and the inner shape of the protection tube. Storage of the pull-out type antenna, characterized in that the shape is substantially the same and a closing means for closing the end of the protective tube that does not face the through hole is provided. Elephants. 2. The retractable antenna storage structure according to claim 1, wherein the material having a low friction coefficient is a fluororesin. 3. The retractable antenna storage device according to claim 1, wherein a locking member having a contact surface capable of contacting an outer peripheral edge of the antenna is provided in the vicinity of the through hole. Construction.