JP3152352U - Whip antenna device - Google Patents

Abstract

A whip antenna for a portable terminal capable of receiving a VHF band broadcast wave in a size used for receiving a one-segment broadcasting in a UHF band by using a mobile phone or the like. A flexible linear first element 4 having an antenna top 2 fixed to an upper end and a sliding spring 3 fixed to a lower end, and the sliding spring 3 freely slides inside. It has the 2nd element 10 which has the flexibility stored so. There is a plate-like portion 13 provided with a hole for inserting a support shaft at the lower part of the lower cylindrical holding portion 11 fixed to the lower end portion of the second element 10, and the recess and the support shaft 12 that can accommodate the plate-like portion are provided. There is a base portion 14 provided with a pair of holes that can be inserted. A hinge portion 15 is formed by connecting the base portion 14 and the plate-like portion 13 with the support shaft 12. A flat coil spring constituting the second element 10 is coarsely wound. [Selection] Figure 1

Description

  The present invention relates to a whip antenna device for a portable terminal for receiving a VHF band broadcast wave.

  The conventional general whip antenna shown in FIG. 5 is flexible and has an antenna top fixed at the tip inside a second element 31 in which a flat plate is tightly wound, and a sliding spring (not shown) at the lower end. The first element 33 to which is attached) is incorporated so as to expand and contract to form a whip antenna.

  In addition, the whip antenna is provided with a hinge 39 at the lower end so that the angle of the antenna can be adjusted, and is further attached to the holder 40 attached to the casing of the portable terminal so as to be retractable and extendable. Therefore, it is used for a mobile phone or the like for receiving one-segment broadcasting using a UHF band frequency that has been widespread in recent years.

In particular, it is known that the second element 31 in FIG. 5 is widely used as an antenna of a mobile terminal for receiving one-segment broadcasting of UHF band broadcasting. Since the metal flat plate is formed into a pipe shape, it has no loading effect, but has a structure that is strong against a lateral load or the like.
However, terrestrial analog TV broadcasting stopped in July 2011 and entered into the age of complete digital broadcasting, but the VHF frequency band vacated by digitization is used for multimedia broadcasting for other portable terminals, etc. I have a plan.

Thus, there is a demand for commercialization of a VHF band antenna that is close to the size of a conventional UHF band one-seg broadcast receiving terminal antenna but has a lower frequency.
As a technique closest to the present invention, Japanese Patent Application Laid-Open No. 2007-214673 “Antenna for portable electronic device” described in the column of Patent Document 1 is known.
In FIG. 26, it is known that a pipe-like antenna is formed by tight winding of a plate-like coil spring.

JP 2007-214673 A

  By the way, recent advances in thinning, miniaturization, and weight reduction of mobile phones are remarkable. Small-sized terminals are also expected to be put on the market for broadcast wave receiving terminals using the VHF band, which are newly started in 2011.

However, when receiving a broadcast wave in the VHF band, the antenna size is naturally larger than that of a one-segment broadcast receiving antenna in the UHF band.
However, it is inevitable that an antenna having almost the same size as the current one-seg receiving whip antenna is required in terms of carrying, operation, miniaturization and weight reduction.

By the way, since the current one-segment broadcasting reception antenna using the UHF band is UHF band reception, a whip antenna having an overall length of about 150 mm is used.
If this antenna of about 150 mm is used in the VHF band, the antenna length is naturally extremely short when compared with an antenna that resonates at a frequency in the VHF band, and does not reach the electrical length that resonates with the VHF. The bandwidth in the antenna performance is reduced, and problems such as difficulty in securing the expected value of the gain arise.

  In order to solve the above-mentioned problem, the whip antenna device according to claim 1 is configured such that the flexible linear first element and the metal flat plate are wound around the coiled element with a coarse winding instead of being densely packed. It is suitable for a VHF band antenna having a low frequency and a long frequency.

  In the whip antenna device according to claim 2, the inner diameter of the first element is larger than the diameter of the sliding spring, and when the first element is extended to the uppermost end, the sliding spring is formed on the inner peripheral surface of the spacer. Because the sliding spring does not stop near the center of the second element of the flat coil spring when the first element is pushed down, the second element is greatly curved. However, there is no risk of deformation of the sliding spring.

  The whip antenna device according to claim 3 is a second element in which a flexible linear first element and a helical antenna are wound around an outer periphery of a resin pipe and an insulating tube is attached around the helical element. Therefore, since the resin pipe serves to reinforce the second antenna, it has a sufficient bending force even when a lateral force is applied.

  In the whip antenna device according to claim 4, the inner diameter of the resin pipe disposed on the inner peripheral surface of the linear helical coil constituting the second element is made larger than the diameter of the sliding spring provided on the first element. Therefore, when the first element is pushed down, the sliding spring of the first element is not held near the central portion of the resin pipe, so that the first antenna may be used without being fully extended. Absent. Therefore, even if a lateral load is applied to the second element and it is bent, there is no possibility that the sliding spring of the first element will be deformed.

  As described above, according to the present invention, a two-stage telescopic whip antenna, which has been widely used to receive one-segment broadcasting of UHF band broadcast waves, is used. Since it is formed as a winding, it can not only gain electric length while having the same length in terms of mechanical dimensions, but also a flat metal plate made into a helical shape with a coarse winding in a coil shape. In contrast, the stress is large unlike a general linear coil.

  In addition, since the four corners of the flat coil spring are chamfered so as to be oval, the damage to the sliding spring that slides in the flat coil spring is small even with rough winding.

  Furthermore, a spacer is attached to the upper end of the flat coil spring, and the sliding spring is stretched and held on the inner peripheral surface, so that electrical conduction is reliable, and the diameter of the sliding spring is larger than the inner diameter of the flat coil spring. Because it is small, it does not stop near the middle part. For this reason, even if the flat coil spring is greatly curved, there is no fear that the shape of the sliding spring will be deformed.

  In addition, since the second element is formed with a coarse winding with a pitch as a linear helical antenna, it is possible to earn more electrical length and a resin reinforcing pipe is inserted inside the helical antenna, Strong enough to withstand loads from

Further, since the sliding spring is inserted into the spring accommodating hole of the upper cylindrical holding portion when the antenna is extended to hold the first element, electrical conduction is ensured.
Further, since the inner diameter of the resin reinforcing pipe is made larger than the diameter of the spring accommodating hole, the sliding spring does not stop in the reinforcing pipe, and the first antenna is extended to the uppermost portion so that it does not conduct with the second element. Many effects can be expected such as there is no situation and the user can easily operate the antenna.

"It is sectional drawing which showed one Embodiment of the whip antenna apparatus concerning this invention." "It is sectional drawing of the flat coil spring shown in FIG. 1." “It is a diagram in which a spacer is mounted inside the upper end of the flat spring shown in FIG. 1.” "It is sectional drawing which showed other embodiment of the whip antenna apparatus based on this invention." “It is a front view of a whip antenna device showing a conventional example.”

FIG. 1 shows an embodiment of a whip antenna device according to the present invention, which corresponds to claim 1.
An antenna 1 installed in a wireless device casing 15 such as a cellular phone has an outer shape made of NiTi (nickel titanium) or the like in which an antenna top 2 is fixed to one end and a lantern-like sliding spring 3 is secured to the other end. A flexible first element 4 having dimensions of 0.7 mm to 1.0 mm and a flat plate coil spring 5 made of metal and having a substantially oval cross section are fixed to an upper cylindrical holding portion 7 having a small end portion 6 at the upper end portion. The sliding spring 3 of the first element 4 is incorporated so as to slide on the inner peripheral surface of the flat coil spring 5, and is provided adjacent to the antenna top 2 side of the sliding spring 3. A flange portion 8 is incorporated by being prevented from being pulled out by the small edge portion 6 of the upper cylindrical holding portion 7.

An insulating tube 9 is placed around the flat coil spring 5 to prevent intrusion of rainwater, dust, etc. The outer dimension is about 2.0 to 3.5 mm, which is referred to as a second element 10.
A cylindrical portion of the lower cylindrical holding portion 11 accommodates and fixes the lower portion of the second element 10 at the lower end portion of the second element 10 and has a hole into which the support shaft 12 is inserted on the opposite side. A plate-like portion 13 is formed.

  A hole is formed in the plate-like portion 13 and a base portion 14 on which the support shaft 12 can be mounted with the plate-like portion 13 being sandwiched between them. A hinge part 15 that can be positioned is constructed.

  The base portion 14 has a concave groove sandwiching the plate-like portion 13 and has holes for stopping both ends of the support shaft, and these are prevented from being detached by inserting the support shaft 12.

  This base portion 14 has a coil spring 16 inside, and the pressing member 18 is pressed against the end of the plate-like portion 13 by this, and the angle of the antenna 1 is held at a free position by this pressing force. Is done.

  A stopper 19 is attached to the lower end of the coil spring to prevent the antenna 1 from falling off the radio housing 17 when the antenna 1 is pulled out. The stopper 19 is a holder having a drum-shaped spring 20 inside. While being held off by the portion 21, the antenna 1 can be rotated while having an inclination angle.

Such a telescopic and rotatable antenna 1 is such that the flat coil spring 5 of the second element 10 is roughly wound in the present invention.
Further, the cross section of the flat coil spring 5 is chamfered at four corners as shown in FIG.
Moreover, since it is carrying out rough winding, the adjacent cross section is not contacting.
Even if the sliding spring 3 of the first element 4 slides on such an inner surface, the oval cross section is not damaged, and a smooth sliding force can be maintained even in long-term use.

  Further, according to FIG. 3, since the spacer 22 having an opening is pressed into the upper end of the flat coil spring 5, the sliding spring 3 is held by the inner surface of the spacer 22 when the first element is pulled out. .

  This means that when the first element 4 is stretched, the electrical connection with the second element can be secured, and when the first element is pushed down, the outer dimensions of the sliding spring 3 are the same as those of the plate coil spring 5. Since it is made smaller than the inner diameter, the first element 4 falls to the lower part of the second element at a stretch and does not stop in the middle.

  This is because, when the second element 10 is bent in the related art, if a sliding spring is positioned near the intermediate portion, there is a tendency that the spring force is changed due to the plasticity deformed into the spring shape. However, this point can be solved.

FIG. 4 shows another embodiment.
In FIG. 4, the same names as those in FIG.
The second element 10 is provided with a linear helical coil 25, and a resin pipe 23 for reinforcing the flexibility of the linear helical coil 25 is inserted along the inner surface of the helical coil 25.
As a result, the weak bending due to the lateral load is eliminated.

The helical coil 25 is covered with an insulating tube 9 on its front surface, and a metallic upper cylindrical holding portion 7 is fixed to its upper end.
The diameter of the spring accommodating hole 24 of the upper cylindrical holding portion 7 is configured to be smaller than the inner diameter portion of the resin pipe 23 and smaller than the diameter of the small opening portion 6 of the upper cylindrical holding portion 7.

Therefore, when the first element 4 is stretched along the inside of the second element 10, the sliding spring 3 provided at the lower end portion of the first element 4 is held inside the spring accommodating hole 24 of the upper cylindrical holding portion 7. The
When the first element 4 is pushed down, the sliding spring 3 falls off the spring housing hole 24 and does not stop in the middle of the resin pipe 23. Therefore, even in the case of the linear helical coil 25, there is no fear that even if the second element 10 is curved, the sliding spring 3 is plastically deformed to impair the sliding force of the spring.

  In this embodiment, an example of a two-stage telescopic whip antenna including a flexible first element 4 and a cylindrical second element 10 has been shown. However, the second element and the first element may be used as necessary. The present invention can also be applied to a three-stage, four-stage or more multistage antenna with a metal pipe slidably mounted therebetween.

  The helical coil according to claim 3 is an embodiment having a linear helical coil around a resin pipe, but a helical antenna may be printed around the resin pipe, or a film-like sheet on which a helical element is printed. It may be configured by winding.

  Along with the digitization of wireless communications, the transition to the digital system of broadcast waves is also planned for audio broadcasting following TV broadcasting.

  After the current VHF television broadcast has shifted to full digital broadcast, multimedia broadcasting for mobile terminals is planned to start, and if the receiving terminal becomes a mobile phone-sized terminal, the whip for receiving 1Seg broadcasts It seems that an antenna length of about 150 mm of the antenna is required. However, since the one-segment broadcasting is in the UHF band, the present invention is useful for enabling reception in the VHF band with the length of the one-segment broadcasting receiving antenna.

Reference explanation

DESCRIPTION OF SYMBOLS 1 ... Antenna 2 ... Antenna top 3 ... Sliding spring 4 ... 1st element 5 ... Flat coil spring 6 ... Small edge part 7 ... Upper cylindrical holding part 8 ... Flange 9 ... Insulating tube 10 ... Second element 11 ... Lower cylindrical holder 12 ... Support shaft 13 ... Plate-like part 14 ... Base 15 ... Hinge 16 ... .... Coil spring 17 ... Radio equipment casing 18 ... Presser 19 ... Stopper 20 ... Drum spring 21 ... Holder part 22 ... Spacer 23 ... Resin pipe 24 ...・ Spring storage hole 25 ... Helical coil

Claims (4)

A flexible linear first element having an antenna top fixed to the upper end and a sliding spring fixed to the lower end, and the sliding spring of the first element freely sliding inside A second element having flexibility, wherein an upper cylindrical holding portion having a small opening is fixed to an upper end portion of the second element, and the first element is prevented from being detached. A lower cylindrical holding part is fixed to the lower end of the two elements, and a lower part of the lower cylindrical holding part has a plate-like part provided with a hole for inserting a support shaft. A whip antenna that constitutes a hinge part by connecting a concave part that can be accommodated and a pair of holes into which the spindle can be inserted, and connecting the base part and the plate-like part with a spindle. , The flat plate core constituting the second element Whip antenna apparatus characterized by the Le spring constituted by the rough winding When a cylindrical spacer is mounted inside the upper end of the flat coil spring and the first element is extended, the sliding spring of the first element is positioned on the inner peripheral surface of the spacer to maintain the extension of the first element. 2. The whip antenna device according to claim 1, wherein A flexible linear first element having an antenna top fixed to the upper end and a sliding spring fixed to the lower end, and the sliding spring of the first element freely sliding inside A second element having flexibility, wherein an upper cylindrical holding portion having a small opening is fixed to an upper end portion of the second element, and the first element is prevented from being detached. A lower cylindrical holding part is fixed to the lower end of the two elements, and a lower part of the lower cylindrical holding part has a plate-like part provided with a hole for inserting a support shaft. A whip antenna that constitutes a hinge part by connecting a concave part that can be accommodated and a pair of holes into which the spindle can be inserted, and connecting the base part and the plate-like part with a spindle. The second element is the length of the center Whip antenna device the resin pipe is mounted, the helical coil is formed on the outer periphery of the resin pipe, further characterized in that fitted with plastic tubing to the outer periphery. The whip antenna device according to claim 3, wherein an inner diameter of the resin pipe is larger than a diameter of a spring housing hole in which the sliding spring of the upper cylindrical holding portion is held.

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