KR19980014542A - Finger strip for electromagnetic wave shielding and front panel structure equipped with it - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clip-on finger strip capable of preventing leakage or intrusion of electromagnetic waves and an improved front panel structure on which the finger strip is mounted.

To this end, the present invention provides a support structure comprising a common base portion having a predetermined width and a length, a support portion connected to one end of the base portion via a first connection portion and extending to the other end of the base portion, A finger strip including a plurality of unit fingers connected to the one end via a second connection portion and having an elastic contact portion extending to the other end of the base portion and a height maintaining means extending to the elastic contact portion; A first side wall formed at one end of the front portion, a fixed body formed at the other end of the front portion and substantially perpendicular to the front portion, and a recess formed in the fixed body, And a second sidewall portion extending parallel to the front portion and having a strip height fixing portion forming a predetermined space portion together with the fixed portion body, wherein the base portion, 2 connection portion and the support portion are fitted to the fixed body, the release preventing means is accommodated in the recess portion, and the height fixing means is accommodated in the elevation portion of the strip.

Description

FINGER STRIP FOR ELECTROMAGNETIC WAVE SHIELDING AND FRONT PANEL STRUCTURE USING THE FINGER STRIP FOR ELECTROMAGNETIC WAVE SHIELD (FINGER STRIP FOR SHIELDING ELECTROMAGNETIC WAVE AND FRONT PANEL STRUCTURE MOUNTING THE SAME)

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a finger strip for shielding electromagnetic waves and a front panel structure for mounting the finger strip, and more particularly, To a clip-on finger strip capable of preventing leakage or penetration of electromagnetic waves from a joint between the panels, and to an improved front panel structure on which the finger strip is mounted.

With the development of the telecommunication industry and the construction of the information society, modern household appliances, industrial electronic devices and information communication devices are downsized, have fast processing power and low power consumption, More devices were installed in the space. As a result, it is gradually exposed to radio noise and various measures have been taken to solve this problem.

The main parts of the equipment in which electromagnetic waves leak and penetrate include a connection part of the device, a cable, a transparent display panel, and a connector connection part. In order to shield the electromagnetic wave generated from the cable, the cable itself is shielded or grounded, and the electric wire inside the cable, that is, the core is twisted as possible. In addition, in order to shield electromagnetic waves leaking from the transparent display panel, a transparent display panel is manufactured using a transparent insulating material such as acryl, a metal fabric mesh and a conductive mesh are embedded in a transparent display panel, or a conductive material is vacuum- Evaporated and shielded.

In such a region, electromagnetic waves can be shielded to a certain extent, but shielding of the connecting portion of the device is not satisfactory enough.

The electromagnetic wave shielding at the connection portion of the device is mainly performed to prevent the electromagnetic waves generated from the outside from intruding into the inside of the device through the atmosphere or to prevent the electromagnetic wave generated inside the device from leaking to the outside. In order to maximize the shielding of the electromagnetic wave at the connection portion of the device, it is optimal to design the joint so that there is no seam. In practice, it is impossible to make the joint at the connecting portion of the device free. Therefore, electromagnetic wave intrusion or leakage at the connection portion of the device is inevitable. To prevent this, an electromagnetic wave shield is mounted between the joints.

Generally, in the case of exchanges, transmission equipment, and communication equipment, when the system is constructed, when the demand is increased considering the expandability, a method of adding modules is mainly used.

For example, as shown in FIG. 1, a plurality of sub racks 2 are installed in a main rack 1, and a plurality of expansion modules 3 are inserted in a sub rack. The expansion module 3 usually comprises an expansion board 4 and a front panel 10 for fixing the board and facilitating handling. A number of expansion modules are plugged into one sub rack, so be careful to maintain a constant gap between the modules and to prevent leakage or intrusion of electromagnetic waves through gaps between the modules. In other words, when a module is inserted into the entire sub rack in a state where a predetermined interval is not maintained between the modules, the module inserted in the latter part receives an excessive force because the space is not secured. In addition, when a shield is not installed between gaps between modules, if electromagnetic waves leak or intrude, external devices or expansion boards in the sub rack are affected and malfunctions.

Generally, the interval between the modules is determined by the distance between the front panels. The front panel generally includes a front wall and a side wall vertically formed at both ends. Therefore, in order to install the shielding member in the clearance between the front panels, it is common to insert a shielding member into either side of both side wall portions and insert the shielding member into the sub rack. At this time, in order to maintain a constant interval between the front panels, the height of the shield must be kept constant. It is also important to install shields that are always of constant height and are not easily deformed, even if modules are frequently inserted and removed.

Fig. 2 shows an example of a conventional front panel and a shield mounted thereon.

As shown in the figure, a slot 22 having a semicircular cross section is formed along the outer side of one side wall of the front panel 10. The cross-sectional shape of the slot is not necessarily limited to a circle, but a circular cross-section is usually used because of ease of assembly. In this slot, a conductive shield 24 of a diameter slightly greater than or equal to the diameter of the slot is inserted. As the conductive shield, conductive rubber or a soft material is usually used to facilitate insertion. Next, the module in which the shield member 24 is mounted on the front panel 10 is inserted into the sub rack, and the adjacent module is inserted again.

In this state, the space between the modules is spaced by about 0.3 mm, which substantially coincides with the height of the shield 24 protruding outside the slot 22 (i.e., the radius of the shield). Therefore, it is possible to shield the electromagnetic waves leaking between the modules.

However, there are some problems in this structure.

First, it is difficult to process the slot. The front panel itself is extrusion-molded, and it is difficult to precisely adjust the machining tolerance in order to have the same slot depth.

Secondly, since the shield material is made of a soft material, it may be torn by friction with an adjacent front panel during use, and electromagnetic wave shielding may not be efficiently performed.

Further, there is a problem in that it is difficult to uniformly adjust the height of the shielding body protruding outside the slot by the machining tolerance of the shielding body itself, in addition to the slot machining tolerance.

In order to eliminate the problem of such a structure, a clip type finger strip shield has been developed. An example of a conventional conventional clip type finger strip and front panel coupling structure is shown in Fig.

Figure 3A shows a portion of a clip-type finger strip, which is actually used in a plurality of connected states via a common base portion. For the sake of explanation, only a part of it is explained here. The elastic contact portion 36 and the support portion 34 extend independently from the base portion 32 through the first connection portion 37 and the second connection portion 38. As shown in FIG.

The base portion 32, the first connection portion 38, and the support portion 34 are substantially clip-shaped to be mounted on the finger strip. Therefore, the first connection portion 38 operates as a spring plate having a restoring force acting in the first direction. Further, the base portion 32, the second connection portion 37, and the elastic contact portion 36 are formed in a tweezer shape so as to absorb an impact against an external force. Accordingly, the second connecting portion 37 acts as a spring plate having a restoring force acting in a second direction opposite to the first connecting portion 38. [

Next, a front panel for mounting a finger strip having such a structure will be described.

The side wall portion 13 of the front panel 10 has a first portion 31 having a predetermined thickness, a second portion 32 having a thickness that gradually extends from the first portion, And an end portion 35 having a constant curvature. The end portion 35 has approximately the same curvature as the first connecting portion 38 of the corresponding finger strip. A jaw 15 is formed at the boundary between the front portion 10 of the front panel 10 and the side wall portion 13 in the extending direction of the front portion.

Referring to FIG. 3C, a first connection portion 38 of the finger strip 30 is connected to the end portion 35 of the front panel. After touching, push it with force. As the thickness of the second portion of the side wall portion gradually decreases, the restoring force of the first connecting portion 38 acts, and consequently the clip shape of the finger strip Portion is tightly coupled to the second portion 33 of the side wall portion. Place the module with the fingerstrips in the front panel into the sub rack, then re-insert the adjacent modules. At this time, the side wall portion of the adjacent module, to which the finger strip is not attached, is inserted while pushing the elastic contact portion 36 of the finger strip into the space portion 39 formed by the jaw portion 15. After the insertion is completed, the restoring force of the second connection part 37 is transmitted to the side wall part of the adjacent module so as to make a uniform interval as a whole, to prevent the adjacent module from moving, and to prevent leakage of electromagnetic waves between the modules .

However, the conventional clip type finger strip has several problems. First, when the adjacent module is inserted into the sub rack, the elastic contact portion of the finger strip is lifted without being pushed into the space portion, resulting in a case where the finger is completely bent at 180 degrees by the force in the insertion direction of the module. When the insertion is completed without detecting such a state, the shielding effect is not properly generated. Further, even if the elastic contact portion is returned to its original state by sensing the elastic contact portion, it is difficult to equalize the height of the elastic contact portion with the adjacent elastic contact portion. That is, when the height of the elastic contact portion returned to the original state is lower than the height of the other elastic contact portions, the shielding effect is not effective. Also, if the second connection is broken by repeating this operation, it is necessary to replace with a new finger strip.

Secondly, there is a problem that the clip-shaped portion of the finger strip is pulled out from the side wall by the force in the insertion direction of the module without being pushed into the space and lifted up as described above. Therefore, in this case, it is troublesome to remove the module and reattach the finger strip.

SUMMARY OF THE INVENTION An object of the present invention is to provide an improved finger strip that can be stably mounted on a front panel.

Another object of the present invention is to provide a finger strip having an elastic contact structure which is difficult to deform when the module is inserted into a sub rack, and a front panel structure for accommodating the finger strip.

Another object of the present invention is to provide a finger strip that can easily return to a state having the same height as other elastic contact portions even when the elastic contact portion of the finger strip is deformed, and a front panel structure for accommodating the finger strip.

1 schematically shows a general structure of a main rack, a sub rack and a module

2 is a cross-sectional view of a conventional finger strip for electromagnetic shielding and a front panel structure

Fig. 3 shows a conventional finger strip for electromagnetic shielding and a front panel

By structure

3A is a perspective view of a conventional finger strip

3B is a sectional view of a conventional front panel

Figure 3C illustrates a conventional finger strip-front panel assembly structure

4 is a view showing a finger strip according to the present invention

4A is a top view of the finger strip of the present invention

4B is a cross-sectional view of the finger strip of the present invention

5 is a sectional view of the front panel according to the present invention

FIG. 6 is a perspective view of a finger strip-front panel assembly structure according to the present invention.

7 is a cross-sectional view showing various modifications according to the present invention

According to an aspect of the present invention, a clip type finger strip of the present invention includes: a common base portion having a predetermined width and length; A support portion connected to one end of the base portion via a first connection portion and extending to the other end of the base portion; an anti-departure prevention means extending to the support portion; a second connection portion connected to one end of the base portion via a second connection portion, And a plurality of unit fingers provided with height maintaining means extending to the elastic contact portion.

According to another aspect of the present invention, a front panel structure of the present invention includes a strip separation prevention part having a fixed body substantially perpendicular to a front part, a first side wall part and a front part and a recess part formed in the fixed body, And a second sidewall portion extending parallel to the front portion and including a strip height fixing portion forming a predetermined space together with the fixed portion body.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

4A is a plan view of a portion of one embodiment of a finger strip according to the present invention, and FIG. 4B is a cross-sectional view taken along line A-A of FIG. 4A. Practically, this part of the finger strip is used in a plurality of connected state via the common base part. For the sake of explanation, only one part is removed here.

4A and 4B, the finger strip 40 of the present invention is entirely bonded to the elastic contact portion 46 and the support portion 44 through the first connection portion 47 and the second connection portion 48 from the base portion 34. [ Respectively.

The base portion 42, the first connection portion 48 extending to the base portion 42 and the support portion 44 extending to the first connection portion 48 are formed in a substantially clip shape so as to be mounted on the finger strip. Although the first connection portion 48 is formed between the second connection portions 47 and 47 in this embodiment, the first connection portion 48 may be formed at a position opposite thereto as the case may be. The first connection portion 48 has a predetermined curvature and is preferably formed with an elastic reinforcing projection 49 on the outside. The elastic reinforcing projection 49 may be formed by stamping the first connecting portion 48 itself or may be newly attached. The first connecting portion 38 acts as a spring plate having a restoring force acting in the first direction and has a restoring force that is further enhanced by the action of the elastic reinforcing projection 49. [ The support portion 44 extends in the first connection portion 48 in such a manner that the distance from the base portion 42 is reduced and the bent portion 41 is formed at a predetermined position near the edge portion. A stopper 45 is preferably formed to protrude outwardly from the outer circumferential surface. The stopper 45 may be formed by stamping the bending portion 41, or may be newly attached to the stopper 45.

The second connecting portions 47 and 47 extending to the base portion 42 and the base portion 42 and the elastic contact portions 46 extending to the respective second connecting portions 47 and 47 are formed into a tweezer shape, So that the impact can be absorbed. The second connection portions 47 and 47 have substantially the same curvature as the first connection portion 48 and the elastic contact portion 46 extends to the second connection portion in such a shape that the distance from the base portion 42 increases. Accordingly, the second connection portions 47 and 47 act like a spring plate having a restoring force acting in a second direction opposite to the first connection portion 48. [ In the finger strip according to the present invention, the end portion of the elastic contact portion 46 has a constant curvature, and the guide portion 43 is extended therefrom. The guide portion 43 has a predetermined length and may have a predetermined inclination angle so as to match the shape of the guide protrusion of the front panel as described later.

Referring to Fig. 5, an embodiment of a front panel of a structure suitable for accommodating the finger strip of the present invention is shown.

As shown in the figure, the front panel 50 includes a front portion 52, a first sidewall portion 51, and a second sidewall portion 53.

The front part 52 is provided with various display parts and input / output terminals for indicating the operating state of the module. The first side wall portion 51 extending vertically at one side end of the front portion 52 is formed to have a shorter length on the outer side, and a cross section of the end portion has a scraper shape.

The second side wall portion 53 extends substantially vertically to the other end portion of the front portion 52. The second sidewall portion 53 largely consists of a strip separation preventing portion and a strip height fixing portion.

The strip separation preventing portion is formed so as to be perpendicular to the front portion as a portion that does not allow the clip strip portion of the finger strip to be received and removed. The strip separation preventing portion is composed of a fixed body 54 and a recess portion 58 formed on the outer surface of the body and having a stepped portion 60 at a predetermined height on one side. The end of the fixed body 54 has a curvature approximately equal to the curvature of the first connecting portion and the second connecting portion of the finger strip. Also, preferably, an inclined angle is provided on the inner surface of the fixed body 54 so that a predetermined step 59 is formed in a portion corresponding to the base portion of the finger strip. Also, preferably, the outer side surface from the end of the fixed body 54 to the recessed portion 58 may have a predetermined inclination angle, and the thickness of the body may be reduced. The recess portion 58 can take any form as long as it can accommodate the bending portion or the stopper of the finger strip. And may be formed into a shape that can be attached to the fixing member to the edge portion including the bent portion of the finger strip. In this case, the thickness of the fixed body may vary depending on the position as a whole.

The strip height fixing portion is formed substantially in a direction parallel to the front portion 52 and comprises a guide portion body 55 and a guide protrusion 56 perpendicular thereto. A predetermined space 57 is formed by the fixed body 54 of the strip separation preventing portion and the guide body 55 and the guide projection 56 of the strip height fixing portion.

Next, referring to FIG. 6, a method of mounting the finger strip according to the present invention having such a structure to the front panel will be described.

When an external force is applied by opposing the end portions of the fixing portion body 54 of the second side wall portion 53 of the front panel 50 at certain intervals between the base portion 42 and the support portion 44 of the finger strip 40, The finger strip is inserted along the second side wall portion 53 fixed body 54 as the gap between the base portion 42 and the support portion 44 spreads. At this time, when the elastic contact portion 46 of the finger strip is pressed after the insertion, the first and second connection portions of the finger strip are completely inserted until they contact the end portion of the fixed body.

The guide portion 43 of the finger strip is completely inserted into the space portion 57 under the guide projection portion 56 and then the restoring force by the second connecting portions 47 and 47 But is blocked by the guide projections 56 and consequently has a structure that faces the guide projections 56 with a constant force. The bent portion 41 formed on the support portion 44 of the finger strip is completely received in the recess portion 58 of the fixed body and the stopper 45 is caught by the step 60 of the recess portion.

Next, effects of the finger strip according to the present invention and the front panel structure for accommodating the finger strip will be described.

The clip portion of the finger strip according to the present invention is fixed to the recess portion formed in the fixed body of the second side wall portion of the front panel of the support portion to prevent the finger strip from being pulled out when the adjacent module is inserted have. Furthermore, the effect can be further improved by the action of the stopper formed in the bent portion. In addition, by selectively providing an inclination angle so that a predetermined step is formed on the inner surface of the fixed body, the finger strip can be more stably fixed to the fixed body of the front panel by positioning the base portion of the finger strip thereon.

Also, since the guide portions of the finger strips are aligned while pressing the guide projection portions of the second side wall portions with a constant force, the elastic contact portions of the finger strips can always be constant and have the same height. Further, even when the adjacent module is inserted, since the guide portion is substantially fixed by the guide projection, the elastic contact portion is lifted and can be prevented from being bent by 180 degrees. Further, even if the guide portion is once removed, if the guide portion is pushed back below the guide projection portion, the guide protrusion portion is pushed by a certain force due to the restoring force of the guide portion.

Further, since the first side wall portion of the front panel is formed to have a shorter length on the outer side surface and the cross section of the end portion has a scraper shape, when the module is inserted, the friction between the end portion and the finger strip elastic contact portion of the inserted adjacent module is minimized So that the deformation of the elastic contact portion can be minimized.

FIG. 7 shows various modifications of the present invention. As shown in FIG. 7A, the shape of the guide protrusion may be a shape in which one side is inclined or a side in which one side has a predetermined curvature . At this time, the guide portions of the finger strips opposed to the one side surface may be deformed to match the modification. Further, as shown in Fig. 7C, the bent portion of the finger strip may be formed in a semicircular shape.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (20)

CLAIMS What is claimed is: 1. A clip type finger strip mounted on said expansion module for preventing leakage or intrusion of electromagnetic waves between a plurality of expansion modules, A common base portion having a predetermined width and a predetermined length; A support portion connected to one end of the base portion via a first connection portion and extending to the other end of the base portion; an anti-departure prevention means extending to the support portion; a second connection portion connected to one end of the base portion via a second connection portion, And a plurality of unit fingers having an elastic contact portion extending to the elastic contact portion and a height maintaining means extending to the elastic contact portion. The clip-type finger strip according to claim 1, wherein the first connection part has a restoring force in a first direction, and the second connection part has a restoring force in a second direction opposite to the first direction. The clip-type finger strip according to claim 1, wherein the release preventing means is a bent portion formed at an end portion of the support portion. The clip-type finger strip according to claim 3, wherein a stopper is formed on a surface of the bent portion opposite to the base. The clip-type finger strip according to claim 4, wherein the stopper is formed by stamping the bent portion. The clip-type finger strip according to claim 3, wherein the bent portion has an arc shape in cross section. The clip-type finger strip according to claim 1, wherein the height maintaining means has a predetermined length and a predetermined inclination angle. And a second sidewall portion formed at the other end portion of the front surface portion, the first sidewall portion being formed at one side end of the front surface portion and the second side surface portion for fixing the extension board of the extension module and mounting the finger strip for shielding electromagnetic waves, The second side wall portion including a fixed body substantially perpendicular to the front portion and a recess portion formed in the fixed body; And a strip height fixing portion extending parallel to the front surface portion and forming a predetermined space portion together with the fixing portion body. The front panel structure according to claim 8, wherein the strip height fixing portion includes a strip guide body extending parallel to the front portion and a strip guide protrusion formed perpendicularly to the guide body. The front panel structure according to claim 7 or 8, wherein the first side wall portion has a shorter outer side surface and an end portion in a scraper shape in cross section. 11. The front panel structure according to claim 10, wherein the recess portion has a predetermined stepped portion on one side. 12. The front panel structure according to claim 11, wherein an inner side surface of the fixed body is formed with a step at a predetermined position so as to have a predetermined inclination angle from an end of the fixed body. A finger strip-front panel assembly of a front panel for fixing an extension board of an extension module and mounting an electromagnetic wave shielding finger strip and the finger strip, The finger strip (1) a common base portion having a predetermined width and length; (2) a support portion connected to one end of the base portion via a first connection portion and extending to the other end of the base portion, a deviation preventive means extending to the support portion, and a second connection portion connected to one end of the base portion via a second connection portion, An elastic contact portion extending to the other end of the base portion, and a plurality of unit fingers provided with height maintaining means extending to the elastic contact portion, The front panel (3) a front portion; (4) a first side wall formed at one end of the front portion; (5) a strip separation prevention part formed at the other end of the front part and having a recessed part formed in the fixed part body and a fixed body substantially perpendicular to the front part, And a second sidewall portion having a strip height fixing portion forming a predetermined space portion together with the fixed body, Wherein the base portion, the first and second connection portions, and the support portion are fitted to the fixed body, the release preventing means is received in the recess portion, Gt; a < / RTI > front panel assembly. 14. The finger strip-front panel assembly of claim 13, wherein the release preventing means is a bent portion formed at an end of the support portion. 15. The finger strip-front panel assembly according to claim 14, wherein a stopper is formed on a surface of the bent portion opposite to the base. 16. The finger strip-front panel assembly according to claim 15, wherein the stopper is formed by stamping the bent portion. The finger strip-front panel assembly according to claim 16, wherein the recess portion has a predetermined stepped portion at one side thereof, and the stopper is received in the recess portion. 17. The finger strip-front panel assembly of claim 16, wherein the bent portion has an arc shape in cross section. 14. The apparatus of claim 13, wherein the strip height fixing portion includes a strip guide body extending parallel to the front portion and a strip guide protrusion formed perpendicularly to the guide portion body, Wherein the guide protrusion is in contact with the guide protrusion with a predetermined force. 20. The finger strip-front panel assembly of claim 19, wherein the first sidewall portion has a shorter outer surface and an end portion in the form of a scraper.