CN1007767B - Bar antenna device - Google Patents

Abstract

A strip antenna having a ferrite core divided into at least two parts, the divided ferrite cores being connected by a flexible connection member, such as a double-coated tape or a silicone rubber containing magnetic powder. Therefore, when an external force is directly applied to the antenna through the case, the ferrite core can be bent to some extent, so that the bar antenna can be prevented from being broken.

Description

Bar antenna device

The present invention relates to a kind of stick antenna, particularly a kind of thin ferrimagnetism stick antenna.

The stick antenna that receives amplitude-modulated wave is housed in the small-sized personal radio shell.This stick antenna is a kind of magnetic core coil.Do fuse with the ferrite that a kind of magnetic conductivity is strong.The received electromagnetic wave value of antenna is directly proportional with the basal area and the length of antenna core.In order to obtain very high sensitivity, need with big fuse.But, because installing space is limited, in fact, in slim personal radio, be used for stick antenna be as shown in Figure 5 length and thin ferrite fuse 40.

Under the situation near shell inner surface in aforesaid stick antenna is contained in slim wireless injection-moulded housing, the external force that puts on housing acts directly on the stick antenna equally, thereby causes the problem of ferrite fuse 40 fractures.If 40 fracture of ferrite fuse, the sensitivity reduction even the afunction of antenna.In addition, also exist the danger that the fracture fragment falls into printed substrate, this can be to All other routes element such as variable resistor, and variable capacitance etc. produce injurious effects.

Therefore, consider these problems, primary and foremost purpose of the present invention provide a kind of in addition its ferrite fuse very thin, the bar antenna device that it also can not break when broadcast receiver is subjected to external force.

In order to achieve the above object, in bar antenna device according to the present invention, the ferrite fuse is divided into one first ferrite fuse 2 and one second ferrite fuse 3 at least, has then disposed a flexible connecting member 4 between the same end face of the second ferrite fuse 3 of the end face of the first ferrite fuse 2.

In bar antenna device of the present invention, because the ferrite fuse is divided into two parts at least, and the ferrite fuse that separates is that when external force acted on the antenna, the ferrite fuse is bending to a certain extent with a flexible connecting member connection.Therefore, the ferrite fuse just may not broken by external force, thereby can prevent that the broadcast receiver sensitivity reduction or the antenna function that produce owing to day thread breakage lost efficacy, and prevents that the antenna fragment is attached on the All other routes element and the adverse effect that produces.

The brief introduction of accompanying drawing is as follows.

Fig. 1 is the longitudinal sectional view of first embodiment of the invention.

Fig. 2 is for explaining many perspective views of first embodiment of the invention installation step.

Fig. 3 A is the cutaway view that is assemblied in the first embodiment of the invention in the broadcast receiver.

Fig. 3 B is the vertical view that is assemblied in the first embodiment of the invention in the broadcast receiver.

Fig. 4 is the cutaway view of second embodiment of the invention.

Fig. 5 is the perspective view that is used for the ferrite fuse of conventional strip antenna.

Below describe first embodiment of the invention with reference to the accompanying drawings.Fig. 1 is the cutaway view of first embodiment of the invention.Label 1 expression entire antenna device.Stick antenna comprises two ferrite fuses 2 and 3.These two ferrite fuses 2 and 3 all are slim, and for example length is 25 millimeters, and thickness is 1.4 millimeters.In other words, to have with length be that 50 millimeters thickness are the characteristic that 1.4 millimeters stick antenna equates to present embodiment.These two ferrite fuses 2 are connected with a flexible connecting member 4 with 3 end face.Can be with pressure-sensitive band material (adhesive double coated tape) or the silicon rubber that scribbles double spread is done connector 4.For this example, can also in silicon rubber, sneak into some Magnaglos.Label 5 expression between ferrite fuse 2 and 3 separately end face with the adhesion layer between the connector 4.Distance between ferrite fuse 2 and 3 the end face should be lacked as much as possible, can be decided to be 0.5 to 2 millimeter.Be that wireless sensitivity reduces about 1 decibel under the about 1 millimeter situation for example in distance.Sensitivity reduces by 1 decibel and not serious in actual applications, because people's ear can not pick out 2 to 3 decibels variation.

On the total length surface of the ferrite 2 that couples together by connector 4 and 3, by tack coat 7 with a film of synthetic resin 6(flexible mylar of 0.1 millimeters thick for example) adhere to.Because the existence of film 6, two ferrite fuses 2 and 3 vertically can keep its position flexibly.The elementary winding 8 of antenna is on the approximate mid-section of ferrite fuse 2, and secondary winding 9 is on the approximate mid-section of ferrite fuse 3.

First embodiment of above-mentioned bar antenna device 1 assembles according to shown in Figure 2.At first, two ferrite fuses 2 shown in Fig. 2 A are connected its end face with 3 usefulness connectors 4, form apperance shown in Fig. 2 B.Secondly, shown in Fig. 2 C, on a whole vertical surface of ferrite fuse 2 and 3, be stained with one deck flexible synthetic resin film 6.After two ferrite fuses 2 and 3 usefulness connectors 4 and film of synthetic resin connected into the antenna element of an integral body, shown in Fig. 2 D, around last, bar antenna device 1 had just assembled like this with the elementary winding 8 of aerial coil and secondary winding 9.

Cutaway view when Fig. 3 A represents that embodiments of the invention are installed on the broadcast receiver.Fig. 3 B represents the vertical view after a wireless half-shells is removed.In Fig. 3, label 20 expression radio receiver shells.Shell 20 usefulness synthetic resin are injection molded, comprise loam cake and lower cover, approximately for example 1 millimeter of wall thickness.Whole wireless thickness is about 5 millimeters.

Label 21 and for example resin strutting piece of nylon injection-molding of 22 expressions, they cooperate with the two ends of stick antenna 1 respectively.An incision and protuberance 23 are arranged on strutting piece 21, stretch in the groove with ferrite 2 cooperations.Because the existence of this incision and protuberance 23 just can be held stick antenna 1 owing to the crooked change in size that produces length.Strutting piece 21 and 22 respective thickness equate with the inside dimension of housing 20.Strutting piece is bonded on the housing 20 with binding agent.

The corresponding external part soldering of the elementary winding 8 of stick antenna and secondary winding 9 is on the printed wire figure connector of making on the printed substrate 24.

Also have, when needing, be preferably in being coated with in appearance of stick antenna 1 that is installed in the above-mentioned housing 20 and wax.

The above-mentioned ferrite fuse 2 of the stick antenna 1 in the housing 20 and the connector 4 of ferrite fuse 3 of being installed in roughly is positioned at half places of housing 20 width dimensionally.Therefore, be subjected to external force at housing 20 and do the time spent, stick antenna 1 makes the connector bending and is out of shape along with the distortion of housing 20, thereby can prevent ferrite fuse 2 and 3 fractures.

Fig. 4 represents the cutaway view of second embodiment of the invention.In the present embodiment, the ferrite fuse 2 that is wound with elementary winding 8 is connected with resin lower support element 31 with the ferrite fuse 3 usefulness resin upper supporting pieces 30 that are wound with secondary winding 9.Upper supporting piece 30 and lower support element 31 have a V-notch 32 and 33 respectively at the middle part of its outer surface.In the present embodiment, when external force acted on upper supporting piece 30 and the lower support element 31, antenna was in breach 32 and the bending of 33 places, thereby also can prevent the fracture of ferrite fuse 2 and 3.

In above-mentioned these embodiment, also the ferrite fuse can be divided into again two sections or multistage more.And the fuse of segmentation connected into an integrated antenna.

Also have, in a second embodiment, can also be with each ferrite fuse is inserted the form of short strutting piece and two ferrite fuses are linked to be an integrated antenna.In addition, the present invention can be used for having the bar antenna device of clavate ferrite fuse equally.

Because antenna is divided at least two ferrite fuses, even external force puts on the antenna, because antenna has flexibility or distortion and can prevent fracture with external force.

Claims (6)

1, a kind of thin bar antenna device, it is characterized in that, have the ferrite fuse of a predetermined length to be divided at least one first ferrite fuse and one second ferrite fuse, and flexible connecting member is disposed between the end face of the end face of the first ferrite fuse and the second ferrite fuse.

2, thin bar antenna device according to claim 1 is characterized in that, above-mentioned connector is a band material that double spread is arranged.

3, thin bar antenna device according to claim 1 is characterized in that, above-mentioned connector is a silicon rubber.

4, thin bar antenna device according to claim 3 is characterized in that, above-mentioned silicon rubber is mixed with Magnaglo.

5, thin bar antenna device according to claim 1 is characterized in that, is stained with one deck film of synthetic resin on a longitudinal terminal surface total length of ferrite fuse.

6, thin bar antenna device according to claim 5 is characterized in that, above-mentioned film of synthetic resin is a polyester.