JP2011061513A - Extensible antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extensible antenna in which a configuration for tilting an element is downsized and the length of the element is made larger when the element is extended. <P>SOLUTION: The extensible antenna 1 is provided with three-staged elements, from a first element 11 to a third element 13, and the lower portion of the third element 13 is fixed on a joint 20. A plate-like holding piece 23a formed on the upper portion of a shaft 23 is held and pivoted by a pair of holding parts 20a formed in the joint 20. A coil spring 24 is accommodated while being compacted between a flange part 23b formed in the shaft 23 and the upper surface of a base 22, and the shaft 23 is energized downward by the coil spring 24. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a telescopic antenna provided in a mobile communication device having at least a receiving function, particularly a mobile phone.

  Although mobile phones are widespread, this mobile phone is equipped with an antenna for transmitting and receiving calls and information. The antenna is built in the casing of the mobile phone or attached along the side of the casing. The antenna is extendable with respect to the casing of the mobile phone so that it can be easily carried when it is on standby. Such a conventional telescopic antenna has a telescope type configuration, except for the lowermost element, it is in a pipe shape, and the lower element is slidably accommodated in the upper element, It is a telescopic antenna. In addition, the conventional telescopic antenna has a linear whip antenna part made of a material having elasticity, and the tip side of this whip antenna part is inserted, and can slide along the whip antenna part. And an upper cylindrical antenna portion held by the whip antenna portion. The telescopic antenna is extended by sliding the cylindrical antenna portion upward with respect to the whip antenna portion, and the telescopic antenna is accommodated by sliding the cylindrical antenna portion downward with respect to the whip antenna portion. become. In such a telescopic antenna, since the joint portion between the device housing and the telescopic antenna where stress due to external force is concentrated is an elastic whip antenna unit, external force is applied to the stretched telescopic antenna from the lateral direction. At this time, the whip antenna portion is bent to absorb the external force, and when the external force disappears, the original self-standing state is restored.

An example of the configuration of a conventional telescopic antenna having three-stage elements is shown in FIG. The telescopic antenna 100 shown in FIG. 5 shows a state where all the three-stage elements are extended.
The extendable antenna 100 shown in this figure includes a first element 111 in the form of a metal pipe, and a second element inserted into the first element 111 from below and slidably inserted into the first element 111. 112 and a third element 113 inserted into the second element 112 from below and slidably inserted into the second element 112. The second element 112 is also formed in a metal pipe shape, and has an outer diameter slightly smaller than that of the first element 111 so that the second element 112 can be accommodated in the first element 111. The third element 113 is made of a linear metal material having flexibility. The lower end of the third element 113 is fixed to the antenna base 114, and the antenna base 114 holds the three-stage element in a tiltable manner. A top portion 110 is provided at the tip of the first element 111 for gripping and expanding and contracting the element. The antenna base 114 is slidably held by a holder 115. When the extendable antenna 100 is extended by attaching the holder 115 to a housing of a wireless device such as a mobile phone, the antenna base 114 is expanded and contracted by the action of the antenna base 114. The antenna 100 is attached to the housing so as to be tiltable and rotatable. Further, when an external force is applied from the lateral direction to the stretchable telescopic antenna 100 shown in FIG. 5, the flexible third element 113 absorbs the external force, and when the external force disappears, the telescopic antenna 100 The original upright state is restored.

FIG. 6 is a cross-sectional view showing a detailed configuration of the antenna base 114, but the joint 120 is partially shown in a half cross section.
As shown in this figure, the third element 113 is configured by covering a flexible element conductor 113a made of a superelastic alloy with a flexible insulating tube 113b. The lower part of the element conductor 113a is fitted from the upper end into a hole formed in the joint 120 substantially along the central axis, and the outer peripheral surface of the joint 120 is subjected to caulking so that the element conductor 113a is attached to the joint 120. It is fixed. In the lower part of the joint 120, both sides of the outer peripheral surface are scraped to form a plate-shaped clamping piece 120a. An insertion hole is formed in the sandwiching piece 120a. The outer diameter of the base 121 is substantially the same as the outer diameter of the first element 111 and is slidably held by the holder 115 when the telescopic antenna 100 is extended. A pair of sandwiching portions 121a is formed by forming a groove in the upper portion of the base 121. By inserting the clamping piece 120a formed on the joint 120 into the groove, the clamping piece 120a is clamped by the clamping part 121a. Then, when the pin 122 is inserted into the insertion hole formed so as to communicate with the pair of clamping portions 121a, the pin 122 is also inserted into the insertion hole formed in the clamping piece 120a in the groove portion. The tip of the inserted pin 122 is processed so as not to come out of the insertion hole. As a result, the joint 120 is pivotally supported by the base 121.

  The base 121 is formed with a hole whose lower end is opened to a position directly below the holding part 121a, and the lower surface of the holding piece 120a pivotally supported by the holding part 121a protrudes into the hole. A push rod 123 whose upper diameter is increased so as to come into contact with the lower end surface of the holding piece 120a protruding into the hole is inserted into the hole so as to be movable in the axial direction. A fitting insertion portion 123a with a reduced diameter is formed in the lower portion of the push rod 123, and a coil spring 124 inserted into the hole is fitted around the fitting insertion portion 123a. The length of the coil spring 124 is such that the lower portion extends downward from the fitting insertion portion 123a, and the lower end of the coil spring 124 comes into contact with the upper surface of the stopper 126 inserted into the hole portion, thereby the coil spring 124. Is shrunk. A ring-shaped groove is formed on the outer peripheral surface of the lower portion of the stopper 126, and the outer peripheral surface of the base 121 corresponding to the ring-shaped groove is subjected to crimping. As a result, a caulking portion 121 b is formed on the outer peripheral surface of the base 121, and a portion protruding inside the caulking portion 121 b is engaged with the ring-shaped groove of the stopper 126, so that the stopper 126 fits inside the hole of the base 121. It is fixed to.

In this case, the coil spring 124 is compressed and urges the push rod 123 upward. As a result, the clamping piece 120a of the joint 120 is urged from below by the push rod 123, and is securely held at a desired angle when the joint 120 pivotally supported by the base 121 is tilted. With this structure, as shown by a broken line in FIG. 5, the telescopic antenna 100 can be tilted from an upright state until it becomes almost horizontal on both sides. The maximum angle of the tilt angle θ is about 90 °. When the tilt angle θ is tilted to a desired tilt angle θ, the elements including the three stages are reliably held at the angle by the biasing force of the coil spring 124. When the telescopic antenna 100 is extended, the engagement piece 121c formed at the lower end of the base 121 is engaged with the lower end of the holder 115 so that it cannot be extended any further.
In addition, the holder 115 is formed in a cylindrical shape having a through-hole formed throughout, and a collar portion 115 a having an increased outer diameter is formed on the upper portion of the holder 115. A screw portion is formed on the outer peripheral surface of a portion below the flange portion 115a, and is further extended downward from the screw portion. A concave portion is formed in the inner peripheral surface of the holder 115, and a drum spring 125 is accommodated in the concave portion, and an engaging portion 115 b to which the engaging piece 121 c engages is formed on the inner peripheral surface of the lower portion of the holder 115. Is formed. When the telescopic antenna 100 is extended, it is securely held by the drum spring 125 elastically in contact with the outer peripheral surface of the base 121 while maintaining the extended state of the telescopic antenna 100.

Next, FIG. 7 shows another example of a configuration of a telescopic antenna having a conventional three-stage element. The telescopic antenna 200 shown in FIG. 7 shows a state where all the three-stage elements are extended.
The telescopic antenna 200 shown in this figure is similar to the telescopic antenna 100, the first element 111, and the second element 112 inserted into the first element 111 from below and slidably inserted into the first element 111. The third element 113 is inserted into the second element 112 from below and is slidably inserted into the second element 112. Since the configuration of these elements is the same as the configuration of the telescopic antenna 100, the description thereof is omitted, but the lower end of the third element 113 is fixed to the antenna base portion 134, and the antenna base portion 134 has three stages. The element is tiltably held. The base 144 in the antenna base 134 is attached to a housing of a wireless device such as a mobile phone, and the telescopic antenna 200 is attached to be tiltable with respect to the housing. Further, when an external force is applied from the lateral direction to the stretchable antenna 200 shown in FIG. 7, the flexible third element 113 absorbs the external force, and when the external force disappears, the telescopic antenna 200 The original upright state is restored.

FIG. 8 is a sectional view showing a detailed configuration of the antenna base 134.
As shown in this figure, the third element 113 is configured by covering a flexible element conductor 113a with a flexible insulating tube 113b. The lower part of the element conductor 113a is inserted from the upper end into a hole formed substantially along the central axis of the stopper 140, and a part of the outer peripheral surface of the stopper 140 is subjected to caulking so that the element conductor 113a is It is fixed to the stopper 140. A screw portion is formed on the outer peripheral surface of the lower portion of the stopper 140, and this screw portion is screwed to a screw portion formed on the inner peripheral surface of the hole portion formed in the joint 141, so The lower half is screwed into the joint 141. A pair of clamping parts 141a is formed by forming a groove part in the lower part of the joint 141, and a hole part with an open upper end formed in the joint 141 is formed up to just above the clamping part 141a. A push rod 142 having an outer diameter substantially equal to the inner diameter of the hole portion is slidably inserted into the hole portion, and the outer diameter of the lower portion of the push rod 142 is slightly increased. A fitting insertion portion 142a having a reduced diameter is formed on the upper portion of the push rod 142, and a coil spring 143 inserted into the hole is fitted around the fitting insertion portion 142a. The length of the coil spring 143 is such that the upper portion extends upward from the insertion portion 142a, and the upper end of the coil spring 143 comes into contact with the lower surface of the stopper 140 inserted into the hole portion, so that the coil spring 143 Is shrunk.

  A plate-like sandwiching piece 144a is erected on the upper surface of the base 144 that is bent in an L shape and is attached to the casing of the wireless device. An insertion hole is formed in the clamping piece 144a. The clamping piece 144a is inserted into a groove formed in the lower part of the joint 141, so that the clamping piece 144a is clamped by the clamping part 141a. Then, the pin 145 is inserted into the insertion hole formed in the holding piece 144a in the groove portion by inserting the pin 145 into the insertion hole formed to communicate with the pair of holding portions 141a. The tip of the pin 145 is processed so as not to come out of the insertion hole. As a result, the joint 141 is pivotally supported by the base 144. The front end of the holding piece 144 a held by the holding portion 141 a protrudes into the hole of the joint 141, and the front end is in contact with the lower end surface of the push rod 142. In this case, the coil spring 143 is compressed and urges the push rod 142 downward. As a result, the clamping piece 144a of the joint 141 is urged from above by the push rod 142, and is securely held at a desired angle when the joint 141 pivotally supported by the base 144 is tilted. With this structure, as shown by a broken line in FIG. 7, the telescopic antenna 200 can be tilted from an upright state until it becomes almost horizontal on both sides. The maximum angle of the tilt angle θ is about 90 °. When the tilt angle θ is tilted to a desired tilt angle θ, the element composed of the three stages is reliably held at that angle by the biasing force of the coil spring 143. The L-shaped base 144 is formed with a screw insertion hole. By inserting a screw into the insertion hole and screwing the screw into the housing, the telescopic antenna 200 is attached to the housing. Become.

JP 2007-300525 A

In the conventional telescopic antenna 100 described above, the configuration in which the three-stage element is tilted requires components of the base 121, the push rod 123, the coil spring 124, and the stopper 126, and the tilt is increased as the number of components increases. There was a problem that would increase. Also, in the conventional telescopic antenna 200, the components of the joint 141, the push rod, 142, the coil spring 143, and the base 144 are required to tilt the three-stage element, and the tilting is performed when the number of components increases. There was a problem that would increase. As described above, when the tilting configuration is increased, the length when the element is retracted cannot be increased, and the length when extended is shortened.
Accordingly, an object of the present invention is to provide a telescopic antenna capable of reducing the size of the configuration for tilting the element and extending the length when the element is extended.

  The antenna of the present invention includes a linear lower element having flexibility, a pipe-like upper element that can be accommodated therein, and is slidably expanded and contracted with respect to the lower element; A lower part of the lower element is fixed, a joint having a pair of sandwiching parts formed at the lower part, and a sandwiching piece pivoted and supported between the pair of sandwiching parts of the joint are formed at the upper part. A shaft having a flange portion with an increased outer diameter at the lower end, an insertion hole through which the clamping piece is inserted, and a substantially cylindrical shape, with the shaft inserted therein. A base formed with a stopper protruding outward at the lower end, and disposed around the shaft so that the lower end contacts the upper surface of the flange portion of the shaft, and the upper end is A coil spring that is compressed and housed in the base so as to abut the inner surface of the upper surface of the sleeve, and the base that is slid when extended is elastically held and can be attached to the housing The most important feature is that it is equipped with a holder.

  According to the present invention, the configuration for tilting the extendable element requires only joints, shafts, coil springs, and base components, so that the number of components can be reduced and the tilting configuration can be downsized. be able to. Accordingly, since the length when the element is contracted can be increased, the length when the element is expanded can be increased.

It is a figure which shows the structure of the expansion-contraction antenna of 1st Example of this invention. It is sectional drawing which shows the detailed structure of the antenna base in the telescopic antenna of 1st Example of this invention. It is a figure which shows the structure of the expansion-contraction antenna of 2nd Example of this invention. It is sectional drawing which shows the detailed structure of the antenna base in the expansion-contraction antenna of 2nd Example of this invention. It is a figure which shows an example of a structure of the conventional expansion-contraction antenna. It is sectional drawing which shows the detailed structure of the antenna base part in the conventional expansion-contraction antenna. It is a figure which shows the other example of a structure of the conventional expansion-contraction antenna. It is sectional drawing which shows the detailed structure of the antenna base in the other conventional expansion-contraction antenna.

FIG. 1 shows the overall configuration of the telescopic antenna 1 according to the first embodiment of the present invention. FIG. 1 is a view showing a state where the telescopic antenna 1 is extended.
In the telescopic antenna 1 of the first embodiment shown in this figure, a top portion 10 is fitted to the tip of a first element 11, and a first element 11 in the form of a metal pipe, The second element 12 is inserted from below into the first element 11 and is slidably inserted into the first element 11. The second element 12 is inserted into the second element 12 from below and is slidably inserted into the second element 12. Three elements 13 are provided. The second element 12 is also made of a metal pipe and has an outer diameter slightly smaller than that of the first element 11 so that the second element 12 can be accommodated in the first element 11. The third element 13 is made of a flexible linear metal material such as a superelastic alloy. The lower end of the third element 13 is fixed to the antenna base 14, and the antenna base 14 allows the three-stage extendable element composed of the first element 11 to the third element 13 to be slidable and tiltable with respect to the holder 15. It is said that. The top part 10 is a part that is gripped when the telescopic antenna 1 is telescopic. The holder 15 is attached to a casing of a wireless device such as a mobile phone. When the holder 15 is attached to the casing, the telescopic antenna 1 can be stored in the casing and attached to the casing so as to be tiltable.

The telescopic antenna 1 according to the first embodiment of the present invention can be used in a state where all the stages are extended as shown in FIG. Further, when not in use, the entire stage is contracted and the telescopic antenna 1 is accommodated in the housing. At this time, the top portion 10 is slid and held in the holder 15.
FIG. 2 is a sectional view showing a detailed configuration of the antenna base 14 in the telescopic antenna 1 of the first embodiment. In FIG. 2, the joint 20 is partially shown in a half section.
As shown in FIG. 2, the third element 13 is configured by covering a flexible element conductor 13a made of a superelastic alloy with a flexible insulating tube 13b. The lower part of the element conductor 13a is fitted from the upper end into a hole formed in the joint 20 substantially along the central axis, and the outer peripheral surface of the joint 20 is subjected to caulking so that the element conductor 13a is attached to the joint 20. It is fixed. The joint 20 has a substantially circular cross-sectional shape and is made of metal. A hole having a predetermined depth is formed from the upper end of the joint 20, and a lower outer diameter is formed.

  Further, in the lower part of the joint 20 whose outer diameter is increased, a groove part is formed in the axial direction in the substantially central part, and a pair of sandwiching parts 20a is formed by forming the groove part. The cross-sectional shape of the clamping part 20a is substantially semicircular, and insertion holes that communicate with the pair of clamping parts 20a are formed in the lateral direction. By inserting a flat plate-like sandwiching piece 23a formed in the upper part of the shaft 23 into the groove portion of the joint 20, the sandwiching piece 23a is sandwiched between the pair of sandwiching portions 20a. Then, when the pin 21 is inserted into the insertion hole formed so as to communicate with the pair of holding portions 20a, the pin 21 is also inserted into the insertion hole formed in the holding piece 23a in the groove portion. The tip of the inserted pin 21 is processed so as not to come out of the insertion hole. As a result, the joint 20 is pivotally supported by the shaft 23. The shaft 23 is made of metal and has a substantially circular cross-sectional shape, and both sides of the outer peripheral surface of the upper part are shaved to form a plate-like sandwiching piece 23a. An insertion hole through which the pin 21 is inserted is formed in the clamping piece 23a.

  The shaft 23 is inserted into a base 22 made of a cylindrical metal whose upper end is closed. In this case, a rectangular groove is formed on the closed upper surface of the base 22, and a flat plate-shaped holding piece 23 a of the shaft 23 is inserted into the rectangular groove, and the holding piece 23 a is the upper surface of the base 22. And is sandwiched between the sandwiching portions 20a as described above. At the lower end of the shaft 23, a flange portion 23b having an increased outer diameter is formed. A coil spring 24 housed in the base 22 is disposed around the shaft 23, and the lower end of the coil spring 24 abuts on the upper end of the flange 23 b and the upper end abuts on the inner surface of the upper surface of the base 22. Yes. The length of the coil spring 24 accommodated in the base 22 is set to a length that generates a predetermined urging force when the coil spring 24 is retracted. The shaft 23 is urged downward by the urging force of the coil spring 24, and the lower surface of the clamping portion 20 a of the joint 20 connected to the shaft 23 comes into elastic contact with the upper surface of the base 22. Thereby, when the joint 20 pivotally supported by the shaft 23 is tilted, the joint 20 is reliably held at a desired angle. With this structure, as shown by a broken line in FIG. 1, the telescopic antenna 1 can be tilted from an upright state until it becomes almost horizontal on both sides. The maximum angle of tilt angle θ is about 90 °, and when tilted to the desired tilt angle θ, even if the three-stage element is fully extended by the biasing force of coil spring 24, it is securely held at that angle. Will come to be.

  The base 22 is made of metal and has a cylindrical shape in which a rectangular groove is formed on a closed upper surface. As described above, the holding piece 23a is inserted into the rectangular groove so as to be freely inserted and removed. At the lower end of the base 22, a stopper 22b that protrudes in the lateral direction is formed. When the telescopic antenna 1 is extended, the base 22 is inserted into the holder 15 from below and is elastically held by the holder 15. Further, when extended, the stopper 22b formed at the lower end of the base 22 engages with the inner side of the lower end of the holder 15 so that it cannot be extended any further. The holder 15 is made of metal, has a cylindrical shape with a through hole formed throughout, and has a flange portion 15 b with an increased outer diameter formed on the upper portion of the holder 15. A screw portion is formed on the outer peripheral surface of the main body portion 15a below the flange portion 15b, and extends slightly downward from the screw portion. A storage recess is formed on the inner peripheral surface of the holder 15, and a drum spring 25 is stored in the storage recess. Further, an engaging portion 15c with which the stopper 22b is engaged is formed on the inner peripheral surface of the lower portion of the holder 15. The extendable antenna 1 can be attached to the housing by screwing the holder 15 into a screw hole formed in the housing of a mobile phone or the like until the lower surface of the flange portion 15b comes into contact.

The drum spring 25 is formed by processing a metal plate having elasticity such as phosphor bronze to form a plurality of elastic pieces, and the whole is bent into a cylindrical shape so that the distorted elastic pieces are inside, and the holder 15 is stored. It is stored in the recess. When the telescopic antenna 1 is extended, the drum spring 25 is elastically brought into contact with the outer peripheral surface of the base 22 inserted into the holder 15 so that the extended telescopic antenna 1 is securely held. When the telescopic antenna 1 is retracted, the top portion 10 is inserted into the holder 15 from above, and the upper portion of the top portion 10 is brought into contact with the upper surface of the flange portion 15b. At this time, the retractable telescopic antenna 1 is securely held by the drum spring 25 elastically in contact with the outer peripheral surface of the top portion 10.
The telescopic antenna 1 according to the first embodiment of the present invention can be tilted at an arbitrary tilt angle from an upright state to a horizontal direction with respect to the housing when the holder 15 is attached to the housing such as a mobile phone. Since the base 22 can be rotated with respect to the holder 15 with the longitudinal axis as a rotation axis, the telescopic antenna 1 can be rotated with respect to the casing in a horizontal plane. In the telescopic antenna 1 of the first embodiment, the push rod or the stopper part in the conventional telescopic antenna can be omitted, and the number of parts is reduced, so that the length of the base 22 is made as shown in FIG. It can be shorter than the telescopic antenna. Then, even if the length of the 1st element 11 in which the 2nd element 12 and the 3rd element 13 are accommodated is lengthened by the part which the base 22 became short, the space which can accommodate the expansion-contraction antenna 1 prepared in the housing | casing Thus, the length of the telescopic antenna 1 can be increased when all the stages are extended.

Next, FIG. 3 shows the entire configuration of the telescopic antenna 2 according to the second embodiment of the present invention. FIG. 3 is a view showing a state where the telescopic antenna 2 is extended.
The telescopic antenna 2 of the second embodiment shown in this figure has a top portion 10 fitted to the tip of the first element 11 in the same manner as the telescopic antenna 1 of the first embodiment, and has a metal pipe shape. The first element 11, the second element 12 inserted from below into the first element 11 and slidably inserted into the first element 11, and the second element 12 inserted from below into the second element 12. 12 includes a third element 13 slidably inserted in 12. The configuration of the three-stage telescopic element composed of the first element 11 to the third element 13 is the same as that of the telescopic antenna of the first embodiment, so that the description thereof is omitted, but the lower end of the third element 13 Is fixed to the antenna base 16, and the antenna base 16 enables a three-stage extendable element composed of the first element 11 to the third element 13 to be tilted with respect to the base 32. The base 32 is attached to a housing of a wireless device such as a mobile phone. When the base 32 is attached to the casing, the telescopic antenna 2 is attached to be tiltable with respect to the casing.

The telescopic antenna 2 according to the second embodiment of the present invention can be used in a state where all the stages are extended as shown in FIG. Further, when not in use, all the stages are contracted, and the telescopic antenna 2 is folded and stored along the casing.
FIG. 4 is a cross-sectional view showing a detailed configuration of the antenna base 16 in the telescopic antenna 2 of the second embodiment. In FIG. 4, the joint 20 is partially shown in a half cross section.
As shown in FIG. 4, the third element 13 is configured by covering a flexible element conductor 13a made of a superelastic alloy with a flexible insulating tube 13b. The lower part of the element conductor 13a is fitted from the upper end into a hole formed in the joint 20 substantially along the central axis, and the outer peripheral surface of the joint 20 is subjected to caulking so that the element conductor 13a is attached to the joint 20. It is fixed. The joint 20 has a substantially circular cross-sectional shape and is made of metal. A hole having a predetermined depth is formed from the upper end of the joint 20, and a lower outer diameter is formed.

  Further, in the lower part of the joint 20 whose outer diameter is increased, a groove part is formed in the axial direction in the substantially central part, and a pair of sandwiching parts 20a is formed by forming the groove part. The cross-sectional shape of the clamping part 20a is substantially semicircular, and insertion holes that communicate with the pair of clamping parts 20a are formed in the lateral direction. By inserting a flat plate-shaped sandwiching piece 33b formed on the upper portion of the shaft 33 into the groove portion of the joint 20, the sandwiching piece 33b is sandwiched between the pair of sandwiching portions 20a. Then, when the pin 21 is inserted into the insertion hole formed so as to communicate with the pair of holding portions 20a, the pin 21 is also inserted into the insertion hole formed in the holding piece 33b in the groove portion. The tip of the pin 21 is processed so as not to come out of the insertion hole. As a result, the joint 20 is pivotally supported by the shaft 33. The shaft 33 is made of metal, and the main body portion 33a has a substantially circular cross-sectional shape. Both sides of the outer peripheral surface of the upper portion of the main body portion 33a are shaved to form a plate-like sandwiching piece 33b. An insertion hole through which the pin 21 is inserted is formed in the clamping piece 33b. Moreover, the collar part 33c with which the outer diameter was enlarged is formed in the lower end of a main-body part.

  The flat sandwiching piece 33b of the shaft 33 is slidably inserted into a rectangular groove formed in a flat base 32 made of metal from the lower surface side. A coil spring 34 is disposed around the body 33 a of the shaft 33, and the lower end of the coil spring 34 abuts on the upper end of the flange 33 c and the upper end abuts on the lower surface of the base 32. The length of the coil spring 34 is a length that is arranged around the main body portion 33a and is compressed to generate a predetermined urging force when the holding piece 33b is held by the holding portion 20a. The shaft 33 is urged downward by the urging force of the coil spring 34. As a result, the lower surface of the clamping portion 20a of the joint 20 comes into elastic contact with the upper surface of the base 32. When the joint 20 pivotally supported by the shaft 33 attached to the base 32 is tilted, a desired state is obtained. It will be held securely at an angle. With this structure, as shown by a broken line in FIG. 3, the telescopic antenna 2 can be tilted from an upright state until it becomes almost horizontal on both sides. The maximum angle of tilt angle θ is about 90 °, and when tilted to the desired tilt angle θ, even if the three-stage element is fully extended by the biasing force of coil spring 34, it is securely held at that angle. become able to.

An attachment hole 32a is formed in the flat base 32, and the telescopic antenna 2 can be attached to the case by inserting a screw into the attachment hole 32a and screwing the screw into a case such as a cellular phone. it can. In this case, a space for storing the shaft 33 is prepared in the housing.
The telescopic antenna 2 according to the second embodiment of the present invention can be tilted at an arbitrary tilt angle from an upright state to a horizontal direction with respect to the housing when the base 32 is attached to the housing such as a mobile phone. become. In the telescopic antenna 2 of the second embodiment, the push rod or stopper component in other conventional telescopic antennas can be omitted, and the number of components is reduced, so that the length of the base 32 as shown in FIG. Can be made shorter than a conventional telescopic antenna. Then, even if the length of the 1st element 11 in which the 2nd element 12 and the 3rd element 13 are accommodated is lengthened by the part which the base 32 became short, the space which can accommodate the expansion-contraction antenna 2 prepared in the housing | casing And the length of the telescopic antenna 2 can be increased when all the stages are extended.

The telescopic antenna according to the present invention described above can be used as a telescopic antenna of a mobile phone or the like that can receive a one-segment partial reception service of digital terrestrial television broadcasting, but is not limited thereto. The telescopic antenna according to the present invention can be applied to a telescopic antenna in general. In addition, although the telescopic antenna of the present invention is a three-stage telescopic antenna including the first element to the third element, the element portion may be a telescopic antenna that can be telescopic in two stages.
Furthermore, in the telescopic antenna according to the present invention, by forming a flat portion on the lower end surface of the clamping portion, when the element is tilted, a click feeling can be obtained when the flat portion comes into contact with the upper surface of the base. At the same time, the tilt angle is maintained. Therefore, by making the lower end surface of the clamping part a quadrangle or a polygon, it is possible to obtain a click feeling when the predetermined tilt angle is reached, and to hold the tilt at the tilt angle.

DESCRIPTION OF SYMBOLS 1 Telescopic antenna, 2 Telescopic antenna, 10 Top part, 11 1st element, 12 2nd element, 13 3rd element, 13a Element conductor, 13b Insulation tube, 14 Antenna base, 15 Holder, 15a Main body part, 15b Gutter part, 15c engaging portion, 16 antenna base, 20 joint, 20a clamping portion, 21 pin, 22 base, 22b stopper, 23 shaft, 23a clamping piece, 23b collar, 24 coil spring, 25 drum spring, 32 base, 32a mounting hole , 33 shaft, 33a main body part, 33b clamping piece, 33c collar part, 34 coil spring, 100 telescopic antenna, 110 top part, 111 first element, 112 second element, 113 third element, 113a element guide 113b Insulating tube, 114 antenna base, 115 holder, 115a collar, 115b engaging part, 120 joint, 120a clamping piece, 121 base, 121a clamping part, 121b crimping part, 121c engaging piece, 122 pin, 123 push rod , 123a insertion part, 124 coil spring, 125 drum spring, 126 stopper, 134 antenna base part, 140 stopper, 141 joint, 141a clamping part, 142 push rod, 142a insertion part, 143 coil spring, 144 base, 144a clamping part 145 pin, 200 telescopic antenna

Claims (2)

A linear lower element having flexibility;
A pipe-like upper element that is capable of being accommodated therein and is slidably expanded and contracted with respect to the lower element;
A joint in which the lower part of the lower element is fixed and a pair of clamping parts are formed in the lower part,
A shaft in which a clamping piece that is clamped and pivotally supported between the pair of clamping parts of the joint is formed in the upper part, and a flange part in which the outer diameter is increased is formed in the lower end;
An insertion hole through which the clamping piece is inserted is formed on the upper surface, the base is formed in a substantially cylindrical shape, the shaft is inserted therein, and a stopper protruding outward is formed at the lower end,
A coil that is disposed around the shaft so that the lower end abuts on the upper surface of the flange portion of the shaft, and is compressed and stored in the base so that the upper end abuts on the inner side of the upper surface of the base. Springs,
A holder that elastically holds the base inserted when stretched and is attachable to a housing;
A telescopic antenna, comprising: A linear lower element having flexibility;
A pipe-like upper element that is capable of being accommodated therein and is slidably expanded and contracted with respect to the lower element;
A joint in which the lower part of the lower element is fixed and a pair of clamping parts are formed in the lower part,
A shaft in which a clamping piece that is clamped and pivotally supported between the pair of clamping parts of the joint is formed in the upper part, and a flange part in which the outer diameter is increased is formed in the lower end;
An insertion hole through which the clamping piece is inserted is formed, and a base that can be attached to the housing;
A coil spring disposed at the periphery of the shaft, the lower end abutting on the upper surface of the flange portion of the shaft and the upper end of the shaft being compressed to be in contact with the lower surface of the base;
A telescopic antenna, comprising:

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