KR100450943B1 - Retractable/extendable reduction module with integrated rolling means for automatic antenna and automatic retractable/extendable antenna system therewith - Google Patents

Abstract

The present invention discloses a pull in / out speed reduction module for an automatic antenna and an automatic pull / out antenna system employing the same. The disclosed deceleration module includes a drive motor, a deceleration unit for decelerating a rotational speed of the drive motor, and a deceleration module connected to the deceleration unit for introducing or drawing a whip antenna, the motor unit; A reduction gear configured coaxially with the first reduction gear and the second reduction gear including an inner gear provided with teeth along an inner surface to engage and decelerate to surround the first reduction gear; And a rolling part which is injection molded integrally from the second reduction gear and coaxially arranged.

Description

Retractable / retractable reduction module for automatic antenna provided with rolling means integrally and automatic retractable / retractable antenna system employing the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device of a portable terminal, and more particularly, to an automatic antenna provided with an integrated rolling means which provides a force capable of automatically drawing in or drawing out a rod-type whip antenna by reducing the rotational speed of a drive motor. A deceleration module and an automatic draw / draw antenna system employing the same are provided.

A typical cellular phone refers to a portable terminal capable of performing wireless communication with a counterpart while performing wireless communication with a base station. Such a portable terminal has an antenna device and converts high frequency energy transmitted from a transmitter into energy of a radio wave and radiates it into a space, and when receiving, absorbs energy of a radio wave that transmits a space and converts it into electric power to supply the receiver. .

A rod type whip antenna and a helical antenna are mainly adopted as the antenna device of the portable terminal, and in particular, the rod type whip antenna has a structure in which an antenna is introduced or drawn out from the main body housing.

However, in the antenna device employed in the portable terminal, in particular, the rod type whip antenna and the helical antenna, the operation of drawing or drawing the rod type whip antenna in order to improve the reception sensitivity is very cumbersome and inconvenient. Thus, an automatic draw / draw antenna system is disclosed that can automatically pull or pull a whip antenna out of a body housing.

A pull-in / out antenna system according to a conventional embodiment is disclosed in detail in Korean Patent Application No. 1998-24444 (1998.06.26). However, the automatic pull-in / out antenna system disclosed in Korean Patent Application No. 1998-24444 has a problem of occupying too much internal space of the main body housing when mounted in the main body housing. In other words, the portable terminal has resulted in the contrary to the trend of miniaturization. In particular, the automatic pull-in / out antenna system disclosed in Korean Patent Application No. 1998-24444 has caused an excessive number of parts, resulting in assemblability and reduced productivity, and resulted in a burden on manufacturing costs.

An automatic drawing / drawing antenna system according to another exemplary embodiment is disclosed in detail in Korean Patent Application No. 1999-26766 (1999.07.03). However, when the automatic pull-in / out antenna system disclosed in Korean Patent Application No. 1999-26766 is also mounted on the main body housing, a problem that occupies too much internal space of the main body housing occurs. In particular, the automatic pull-in / out antenna system disclosed in Korean Patent Application No. 1999-26766 has caused excessive assembly numbers and reduced productivity, resulting in a burden on manufacturing costs.

Accordingly, an object of the present invention is to provide a pull-in / out module for an automatic antenna, which is advantageous for miniaturization of a portable terminal by minimizing a space mounted on a main body housing.

Another object of the present invention is to provide a pull-in / pull-out reduction module for an automatic antenna that can reduce the number of parts to improve the assembly and productivity.

Still another object of the present invention is to provide an induction / outtake reduction module for an automatic antenna in which the reduction unit and the rolling unit are integrally formed.

It is still another object of the present invention to provide an automatic draw / draw antenna system employing a pull / draw deceleration module for an automatic antenna.

In order to achieve the above object, the present invention provides a drive motor, a deceleration unit for reducing the rotational speed of the drive motor, and a deceleration module connected to the deceleration unit for introducing or withdrawing a whip antenna,

A motor unit;

A reduction gear comprising a first reduction gear and a second reduction gear including an inner gear provided with teeth along an inner surface to engage and decelerately enclose the first reduction gear, the reduction gear being provided coaxially from the motor part; And

It is composed of a rolling portion coaxially disposed by injection molding integrally from the second reduction gear.

Furthermore, the present invention provides an antenna system for automatically drawing / drawing a whip antenna,

(a) a motor unit; A reduction gear configured coaxially with the first reduction gear, the second reduction gear including an inner gear provided with teeth along an inner surface to engage and decelerately envelop the first reduction gear; A reduction module composed of a rolling part which is integrally injection-molded and coaxially formed from the second gear; And

(b) an auxiliary roller disposed in a state spaced apart from the rolling part and in contact with the whip antenna.

1 is a perspective view illustrating a portable terminal in which a whip antenna is retracted by adopting a preferred automatic retract / retract antenna system of the present invention.

2 is a perspective view illustrating a portable terminal in which a whip antenna is pulled out by adopting a preferred automatic draw / draw antenna system according to the present invention;

3 is a plan view showing a state in which the automatic antenna pull-in / pull-out reduction module according to the first embodiment of the present invention is mounted to the main body housing.

Figure 4 is a side cross-sectional view showing a configuration of the main body housing the pull-in / pull-out reduction module for an automatic antenna according to a first embodiment of the present invention.

FIG. 5 is an enlarged perspective view of an appearance of a pull-in / out speed reduction module for an automatic antenna according to a first embodiment of the present invention; FIG.

6 is a side view of FIG. 5;

7 is a plan view of FIG.

8 is a cross-sectional view of the line X-X in FIG.

9 is a cross-sectional view showing the gear arrangement of the reduction module according to the first embodiment of the present invention.

FIG. 10 is an enlarged perspective view of an appearance of a pull-in / out speed reduction module for an automatic antenna provided with a rolling means integrally according to a second preferred embodiment of the present invention; FIG.

FIG. 11 is a front view of FIG. 10; FIG.

12 is a plan view of FIG. 10.

13 is a cross-sectional view of the line Y-Y of FIG. 12.

14 is a perspective view showing a gear box of a reduction module according to a second embodiment of the present invention.

15 is a front sectional view showing an engaged state between the planetary gear and the inner fixed gear of the gear box according to the second embodiment of the present invention.

Figure 16 is an exploded perspective view showing a state in which the reduction module provided integrally with the rolling means according to the second embodiment of the present invention is coupled to the mounting bracket and the auxiliary bracket.

17 is an assembled perspective view illustrating a state in which a reduction module in which a rolling means according to a second embodiment of the present invention is integrally coupled to a mounting bracket and an auxiliary bracket.

18 is a plan view showing a state in which the reduction module according to the second embodiment of the present invention is mounted in the main body housing.

19 is a side cross-sectional view of FIG. 18;

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As shown in FIGS. 1 to 3, a portable terminal, specifically a flip type terminal illustrated in FIG. 1, rotatably connects the main body housing 10, the flip 20, and the main body housing 10 and the flip 20. And a hinge device (not shown). The body housing 10 includes an antenna device (only a whip antenna is shown), an ear piece 12, an LCD 13, a keypad 14, and a microphone device 15. The flip 20 is opened and closed at a predetermined angle in the body housing 10 about the hinge axis A1.

At this time, the automatic antenna pull-in / draw-out module 30 (shown in FIG. 3) according to the present invention is applied to a portable terminal employing an antenna device having a rod-type whip antenna 11. It should be noted that the automatic antenna pull-in / out speed reduction module 30 according to the present invention does not need to be limited to a flip-type portable terminal, but may be similarly applied to a folding-type portable terminal.

1 to 3, a portable terminal equipped with an automatic in / out antenna system having an in / out speed reduction module for an automatic antenna according to the present invention ends a call so that the flip 20 is connected to the main body housing ( 20, the whip antenna 11 is pulled into the main housing 10 (in the direction of the arrow ①), and when the flip 20 is opened in the main housing 10 to make a call, the whip antenna 11 It serves to take out (arrow ② direction) out of the body housing (10).

The above-mentioned pull-in operation of the whip antenna 11 refers to the whip antenna 11 automatically entering the antenna housing 10a when the call is closed and the flip 20 is closed. The withdrawal operation means that when the flip 20 is opened to make a call, the whip antenna is automatically withdrawn from the antenna housing 10a. Of course, if a separate call operation button (not shown) is provided regardless of whether the flip 20 is opened or closed, the whip antenna 11 may be drawn in or drawn out according to whether the call operation button is pressed. The deceleration module 30 provides the pulling force or the pulling force of the whip antenna 11.

The automatic antenna pull-in / out speed reduction module 30 is mounted at a predetermined position of the portable terminal and performs a function of automatically drawing or drawing the whip antenna 11. Specifically, the pull-in / out speed reduction module 30 (hereinafter abbreviated as "deceleration module") for the automatic antenna is mounted at a distance close to the whip antenna 11 of the portable terminal, in particular below the antenna housing 10a. This is because the deceleration module 30 is the place where the transfer force of the pulling force or the withdrawal force can be most effectively performed when the deceleration module 30 performs the operation of pulling in or out of the body housing 10.

The deceleration module 30 is mounted on the bottom of the main housing 10 by using a separate fastening bracket 40, a fastening part 42 and a screw S provided to the bracket, as shown in FIG. In addition, it is combined with a separate auxiliary roller 50 and the leaf spring 44 to implement an automatic pull-in / pull-out antenna system. Since the deceleration module 30 is mounted directly under the antenna housing 10a, the whip antenna 11 is pulled in / out in the direction of arrow ③. The roller (not shown) provided in the deceleration module 30 rotates in the direction of arrow ④ about the rotation axis A2.

A detailed configuration of the reduction module 30 according to an embodiment of the present invention will be described with reference to FIGS. 5 to 7. As shown in FIGS. 5 to 7, the deceleration module 30 according to the present invention includes a motor unit 310, a deceleration unit 320 for decelerating the rotational speed of the motor unit 310, and the deceleration unit. It is composed of a rolling unit 330 provided integrally with (320).

The motor unit 310 is composed of a general rotary motor 311. In addition, the reduction unit 320 may include only a center gear 312 provided to the motor unit 310 and at least one planetary gear 322 and 323 disposed in engagement with the center gear 312. And an inner gear 325 engaged with the planetary gear 322. The deceleration module 30 decelerates the rotational speed provided by the motor unit 310 at least once to provide the rotational force reduced by the rolling unit 330. In addition, the deceleration part 320 is protected by the case 321. Reference numerals A3 and A4 denote rotation axes of the planetary gears.

The rolling unit 330 has already been described as being integrally formed with the reduction unit 320. Specifically, the rolling unit 330 is injection molded integrally with the inner gear 325 to extend out of the case 321. do. That is, the inner gear 325 and the rolling part 330 are provided integrally at the time of injection molding. In particular, a shaft portion 324 is provided and connected between the inner gear 325 and the rolling portion 330. At this time, the rolling unit 330 extends coaxially with the center gear 312, the hinge shaft 332 is formed at its end. In addition, the rolling unit 330 is additionally provided with a rubber 334 in order to maximize the friction force generated in contact with the whip antenna. The rubber 334 is overlaid on the roller 331 of the rolling part 330. Preferably, the roller 331 is provided in a failure type to maximize the contact area with the whip antenna.

When the rubber 334 is in contact with the outer circumferential surface of the whip antenna to perform the drawing / drawing operation, a certain amount of pressure is generated at both interfaces, and the generated pressure is formed in the groove 333 formed on the outer circumferential surface of the roller 331. By being absorbed by, the contact area between the rubber 334 and the whip antenna is maximized.

Hereinafter, the deceleration principle and the deceleration operation of the deceleration unit 320 of the deceleration module 30 according to the present invention will be described with reference to FIG. 8. As shown in Fig. 8, a plurality of planetary gears 322, 323, 324 are engaged with a center gear 312 connected to the motor unit. Each of the planet gears 322, 323, 324 is engaged. The central axes 322a, 323a, and 324a are disposed at an angle of 120 ° with respect to the center axis of the center gear 312, and are arranged at equal intervals. The planetary gears 322, 323, and 324 mesh with each other, and the first, second, and third planetary gears 322, 323, and 324 rotate as the center gear 312 rotates. Each of the 322, 323, and 324 meshes with an internal gear 325. The inner gear 325 is provided with teeth on the inner surface 325a, and the provided teeth are the respective first, second, and third planetary gears. 322, 323, 324 and a predetermined distance between the center gear 312 is rotated, the first and second meshes with the center gear 312 respectively. The three planetary gears rotate, and the inner gear 325 meshing with the one, two, three planetary gears rotates, wherein each of the first, second, and three planetary gears ( The number of teeth of 322, 323, and 324 is large, and the deceleration operation occurs because the number of teeth of the inner gear 325 is larger than that of the first, second, and third planetary gears 322, 323, and 324.

When the center gear 312 is engaged with the first, second, and third planetary gears 322, 323, and 324 to transmit power, the first deceleration occurs, and the first, second, and third planetary gears are engaged with the inner gear 325. Secondary deceleration occurs when power is transmitted. That is, in the present invention, two decelerations are generated in the process of transmitting power from the motor unit 310 to the rolling unit 330. The deceleration may achieve a desired reduction ratio by adjusting teeth of the center gear 312, the first, second, and third planetary gears 322, 323, and 324 and the inner gear 325.

10 to 13 are views illustrating a reduction module 410 (hereinafter, referred to as a "deceleration module") provided integrally with a rolling means 430 according to a second embodiment of the present invention. As shown in FIGS. 10 to 13, the reduction module 410 according to the second embodiment of the present invention includes a driving motor 411 and a reduction unit 412 fastened to the driving motor 411. The reduction unit 412 is provided with a rolling means 430 integrally. In addition, the reduction unit 412 is further provided with a case 421 to be fastened to the drive motor 411 to protect a plurality of gears constituting the reduction module from the external environment. In this case, the case 421 accommodates the reduction unit 412, but does not receive the rolling means 430. The case 421 includes a fastening end 421a and a fastening hole 421b for fastening to the driving motor 411.

The drive motor 411 is a power source, the rotation direction and the rotation speed is controlled by a controller not shown, it means a rotary drive motor. The deceleration part 412 is engaged with the gear box 422 provided with the rotational force of the rotation shaft 411a of the driving motor, and the inner fixed gear 440 which rotates the gear box 422 by meshing with the gears of the gear box 422. ), An inner rotary gear 442 that is decelerated by engaging with the gears of the gear box 422, and a rolling means 430 that is injection molded integrally with the inner rotary gear 442.

13 and 14, the gear box includes a gear housing 422, a center shaft 425 coupled with a shaft 411a of a drive motor, and the center in a state of being restrained by the gear housing 422. It consists of three planetary gears 423, 424, 425 that engage at equal intervals with the shaft 425. The planetary gear 423 includes a first gear part 423a having different gear teeth and a second gear part 423b extending from the first gear part 423a. The other two planetary gears 424 and 425 also have the same configuration as the planetary gear.

The rolling means 430 is composed of a roller 431, a rubber 434 mounted to surround the outer circumference of the roller 431, and a hinge 432 extending in the rotational central axis direction of the rolling. The roller 431 is made smaller in diameter as it goes in the middle than the upper and lower ends, and made larger in diameter as it goes toward the upper and lower ends. That is, the roller 431 is configured of a failure type.

Preferably, the support member 413 is further provided between the drive motor 411 and the reduction unit 412. The support member 413 is mounted to the driving motor 411 to restrain the inner fixing gear 440, and the fastening protrusion 413a that engages with the fastening hole 421b formed in the fastening end 421a of the case 421. ). A plurality of fastening protrusions 413a are formed along the outer circumference of the support member.

The structure of the gear box will be described in detail with reference to FIG. 13. The gear box includes a center gear 426, a gear housing 422, and at least one or more planetary gears provided in the gear housing 422 and engaged with the center gear 426. Three planetary gears 423, 424, 425 are shown in the figure. The gear housing 422 is composed of upper and lower plates 422a and 422b and a connecting body 422c connecting the upper and lower plates. The connector 422c is provided with three, and two connectors are shown in the drawing. An opening is formed between the connecting bodies 422c so that a part of each planetary gear protrudes from the gear housing. The central rotation axes of the three planetary gears 423, 424, 425 around the gear housing 422 are provided at equal intervals with an angle difference of 120 degrees about the rotation axis of the gear housing 422.

Since the three planetary gears 423, 424, 425 have the same configuration, only one planetary gear 423 will be described. The one planetary gear 423 includes a first gear part 423a and a second gear part 423b connected to the first gear part 423a. The number of teeth of the first gear part 423a and the second gear part 423b is different. The number of teeth of the first gear part 423a is greater than the number of teeth of the second gear part 423b. The tooth differences of the first and second gear parts 423a and 423b are provided for the third deceleration.

The first gear part 423a is engaged with the inner fixed gear, and the second gear part 423b is engaged with the inner rotation gear. The rotational force of the drive motor transmitted to each of the planetary gears 423, 424, 425 is engaged with the fixed gear so that the gear box rotates at a reduced speed so that secondary deceleration occurs, and the inner rotary gear and the second gear part 423b are rotated. As the engagement, third deceleration occurs.

As mentioned above, the first gear portion 423a and the second gear portion 423b are decelerated because the gear teeth are different.

A deceleration operation of the deceleration module according to the second embodiment of the present invention according to the above configuration will be described in detail with reference to FIG. 13. When the drive motor rotates, the motor shaft 411a extending from the drive motor 411 rotates. Subsequently, the center gear 426 of the gear box connected to the motor shaft 411a rotates. Planetary gears of the gear box meshed with the center gear 426 rotate. At this time, the first deceleration is generated according to the tooth number difference between the center gear 426 and the first gear parts 423a and 423b of the respective planetary gears. Of course, the number of teeth of the first gear portion of the planetary gear is larger than the number of teeth of the center gear 426. Simultaneously, since the first gear portion of the planetary gear is engaged with the inner fixed gear 440, the gear box 422 rotates. At this time, the gear box is rotated at a second reduced speed. Subsequently, the inner rotary gear 442 meshed with the second gear parts 423b and 424b of the planetary gear rotates. The second decelerated gear box is engaged with the inner rotary gear to transmit the third decelerated rotational force generated by the teeth number difference of the first and second gear parts to the rolling means 430. Of course, the teeth of the first gear portion and the second gear portion of the planetary gear are different. In order to decelerate once more, the number of teeth of the second gear portion is smaller than that of the first gear portion.

As a result, the number of revolutions transmitted to the rolling means 430 starts three times by starting from the driving motor 411.

Hereinafter, a configuration for mounting the reduction module to the main body housing will be described. As shown in FIG. 16 and FIG. 17, the reduction module 410 in which the rolling means 430 is integrally provided according to the second embodiment of the present invention may be a body housing predetermined position using two brackets, specifically an antenna housing. It is mounted right underneath. The two brackets are composed of a fastening bracket 50 and an auxiliary bracket 60 fastened to the fastening bracket 50. The fastening bracket 50 surrounds the deceleration unit 413 and the rolling means 430 of the reduction module, and the auxiliary bracket 60 surrounds the rolling means wrapped by the fastening bracket 50. The fastening bracket 50 includes a first portion 51 surrounding the deceleration part 413 and a second portion 52 surrounding the rolling means 430. The first and second portions 51 and 52 are integrally made of a metal material, but may be made of a plastic material. Two fastening pieces 56 (only one is shown in the figure) are formed in the first part 51, and fastening holes are formed in the fastening pieces 56. The second portion 52 is provided with an open end at an upper end thereof, a hinge hole 54 at a rear end thereof, and an opening 55 at the lower end thereof for the rod antenna to pull in and pull out. In addition, the fastening protrusion 53 is formed symmetrically at the side end of the second portion 52. The fastening protrusion 53 is formed to be coupled to the auxiliary bracket 60. When the auxiliary bracket 60 is coupled to the fastening protrusion 53, the auxiliary bracket 60 forms an integral part with the fastening bracket 50.

The auxiliary bracket 60 has an upper end 61 at a closed end, a fastening hole 62 at a side end, and a protruding portion 64 at the lower end 63. The protruding portion 64 is a portion in contact with or sliding with the rod antenna. The auxiliary bracket 60 is manufactured by pressing and bending a thin metal plate, and thus retains elasticity by itself.

18 and 19 show a state in which the automatic in / out antenna system having the above-described configuration is mounted on the main body housing. When the fastening hole is fastened to the two groups by using a screw in the fastening hole, the reduction module is mounted in the main body housing. In addition, the rod antenna is positioned between the rolling portion and the protrusion of the auxiliary bracket to perform the drawing operation or the drawing operation in the direction of the arrow.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but it will be apparent to those skilled in the art that various modifications are possible without departing from the scope of the present invention.

As described above, the reduction module according to the present invention is composed of a motor driving unit and a rolling portion integrally reduced in overall size, it is also advantageous in miniaturization of the main body housing. In particular, the reduction module according to the present invention has reduced the number of parts to improve the assembly and productivity, and achieved the effect of reducing the manufacturing cost.

Claims (28)

In the drive motor, the deceleration unit for reducing the rotational speed of the drive motor, and the deceleration module connected to the deceleration unit for introducing or drawing the whip antenna, A motor unit; A reduction gear configured coaxially from the motor and configured of a second reduction gear including an inner gear provided with a toothed gear along an inner surface to engage and decelerate the first reduction gear and the first reduction gear; And Reduction module, characterized in that consisting of a rolling portion coaxially disposed by injection molding integrally from the second reduction gear. The reduction module according to claim 1, wherein the rolling part includes a roller, and the roller is formed in a failure type to maximize friction with the whip antenna. The reduction module as claimed in claim 1, wherein the rolling unit further includes a rubber. The method of claim 1, wherein the reduction unit A center gear provided at the motor unit; A first deceleration gear that decelerates the rotational speed transmitted from the center gear first; And And a second reduction gear configured to engage with the first reduction gear to secondly reduce the first reduced rotational speed to transmit the secondly reduced rotational speed to the rolling part. delete delete 5. The reduction module according to claim 4, wherein the first reduction gear is composed of at least one planetary gear engaged with the outer circumference of the center gear. 8. The reduction module according to claim 7, wherein the planetary gears are arranged at three equal intervals in the radial direction about the center gear. delete The reduction module according to claim 1, wherein the reduction unit is wrapped and protected by a case and is assembled to the motor unit. The deceleration module according to claim 1, wherein the direction in which the rotation axis of the rolling part faces and the direction in which the whip antenna is pulled in or pulled out are perpendicular to each other. An antenna system for automatically introducing / drawing a whip antenna, (a) a motor unit; A reduction gear configured coaxially with the first reduction gear and the second reduction gear including an inner gear provided with teeth along an inner surface to engage and decelerate to surround the first reduction gear; A reduction module comprising a rolling part coaxially injection molded from the second gear and coaxially disposed; And (b) an automatic retracting / drawing antenna system, comprising: an auxiliary roller disposed to be spaced apart from the rolling part and in contact with the whip antenna. delete In the deceleration module comprising a drive motor, a deceleration unit for reducing the rotational speed of the drive motor, and a roller connected to the deceleration unit for pulling in / out the whip antenna, (a) a drive motor; (b) a gear box comprising an inner fixed gear and a plurality of planetary gears rotating in engagement with the inner fixed gear and an inner rotary gear that is engaged with the gear box to decelerate and is disposed coaxially from the drive motor; (c) rolling means integrally injection molded from said inner rotary gear; (d) a case surrounding the reduction unit; And (e) a reduction module, which is provided between the drive motor and the reduction unit, and is composed of a support member for restraining the case and the reduction unit. 15. The method of claim 14, wherein the rolling means roller; And And a roller and an injection molded hinge, wherein the roller is configured as a failure type. 15. The reduction module according to claim 14, wherein the rolling means further includes a rubber, and the rubber is mounted to surround the outer circumference of the roller. delete The method of claim 14, wherein the gear box Gear housing; At least two planetary gears accommodated in the gear housing and disposed radially at equal intervals about the rotation axis; And And a center shaft engaged with the planetary gear and coupled to the shaft of the drive motor. 19. The reduction module according to claim 18, wherein three planetary gears are disposed at equal intervals in the radial direction about the center gear. 19. The reduction module according to claim 18, wherein each of the planetary gears further includes a reduction means. The method of claim 20, wherein the deceleration means A first gear portion having a predetermined diameter size and teeth number and engaged with the inner fixed gear; And Reduction module, characterized in that the gear tooth number and diameter size is smaller than the first gear portion, the second gear portion engaging with the inner rotary gear. 19. The device of claim 18, wherein the gear housing is Upper and lower plates; And The deceleration module is connected to the upper and lower plates, characterized in that composed of at least two or more connecting elements arranged at equal intervals. In the automatic pull in / pull out antenna system for pulling in / out the load antenna of the portable terminal, (a) a deceleration composed of a drive motor, a gear box composed of a coaxially disposed from the drive motor and a plurality of planetary gears rotating in engagement with the inner fixed gear, and an inner rotation gear engaged with the gear box and decelerating. A deceleration module, comprising: a rolling means extending from the inner rotary gear and integrally injection molded; (b) a fastening bracket comprising a first part surrounding the deceleration part and a second part extending from the first part to surround the rolling means and mounted at a predetermined position in the main body housing; And (c) an automatic pull-in / out antenna system, comprising: an auxiliary bracket fastened to the fastening bracket and surrounding the second part. 24. The system of claim 23, wherein the fastening bracket further has an opening at the bottom for opening / dripping the whip antenna. 24. The system of claim 23, wherein each of the fastening brackets further includes fastening protrusions at side ends thereof. 24. The system of claim 23, wherein the auxiliary bracket further includes a fastening hole at a side end and a protrusion at a lower end thereof. 24. The system of claim 23, wherein the fastening bracket is made of metal. 24. The system of claim 23, wherein the auxiliary bracket is made of sheet metal.