KR20060074130A - Apparatus for testing reliability of bending of a flexible pcb - Google Patents

Abstract

An apparatus for testing the bending reliability of a flexible substrate used in a mobile terminal such as a cellular phone or a printer cable is provided.

Flexural reliability test apparatus for a flexible substrate according to the present invention, the clamping one side end of the flexible substrate, the rotation means mounted to the base to be rotatable around the rotation axis; Support means for fixing the other end of the flexible substrate with a clamp; Jig means for simulating the part shape of the finished product on which the flexible substrate is mounted between the rotation means and the support means, and the flexible substrate passes through the inside thereof; and a flexible substrate connected to the rotation means to impart a driving force. It comprises a; drive means for achieving a repeating bending operation, including a state in which the flexible substrate is mounted on the finished product is configured to bend test. According to the present invention, the flexural reliability of the flexible substrate is more accurately by subjecting the flexural test under the same conditions as before the manufacture of the finished product using a jig that simulates the shape of the device actually applied in the process of testing the flexural reliability of the flexible substrate. The effect of testing is obtained.

Flexible board, Flexural reliability tester, Clamp, Rotating means, Jig means, Finished product

Description

Apparatus for Testing Reliability of Bending of A Flexible PCB

1 is a block diagram showing a flexible PCB for a mobile phone according to the prior art;

2 is a perspective view showing an overall bending reliability test apparatus of a flexible substrate according to the prior art;

Figure 3 a), b) is a detailed view showing a state in which a flexible substrate for a mobile phone is mounted in the bending reliability test apparatus of a flexible substrate according to the prior art;

4 is an enlarged detailed view of a main part of a bending reliability test apparatus for a flexible substrate according to the present invention;

5 is an explanatory diagram showing a state in which the jig means provided in the bending reliability test apparatus of the flexible substrate according to the present invention simulates the hinge portion of the mobile phone;

6 is an exploded perspective view showing a state in which the jig means provided in the bending reliability test apparatus of the flexible substrate according to the present invention is coaxial to the rotation axis;

7 is a side view showing a state in which the flexible substrate is mounted on the bending reliability test apparatus of the flexible substrate according to the present invention;

A), b) and c) of FIG. 8 are operation explanatory diagrams showing the state in which the bending reliability test apparatus of the flexible substrate according to the present invention performs the bending performance test step by step.

       <Description of the symbols for the main parts of the drawings>

1 .... Bending reliability test apparatus for flexible substrates according to the present invention

5 .... flexible substrate 5a .... one end of flexible substrate

5b .... The other end of the flexible board 10 .... Rotating means

10a ... rotating plate 12 .... clamp

14 .... rotating shaft 20 .... supporting means

20a ... support plate 30 .... jig

32,34 ... First and second jigs 33a, 35a ... First and second cylindrical parts

33b, 35b ... opening 33c, 35c ... first and second connection

50 .... angle adjustment means 52 .... support

54 .... Adjusting bolt 56 .... Shock absorber

70 .... Rotating speed control means 72 .... Anchor member

74 .... spring means 100 .... flexible board

110 .... Hard board 120 .... Connector

150 .... Bending reliability tester of conventional flexible board

160 .... rotating plate 162,172 .... clamp

164 .... Base 166 .... Spindle

170 .... base 180 .... power transmission

190 .... Counter 195 .... Resistance meter

197 .... Monitor L1, L2, L3 ... spring means length

S1, S3 ... Deceleration section S2, S4 ... Acceleration section

The present invention relates to a device for testing the bending reliability of a flexible substrate used in a mobile terminal such as a mobile phone or a printer cable, and more specifically, to simulate the shape of the device that is actually applied in the process of testing the bending reliability of the flexible substrate. (Iii) The present invention relates to an improved flexural reliability testing apparatus for flexible substrates, in which the flexural test of flexible substrates can be more accurately tested by performing a bending test under the same conditions as before the manufacture of the finished product.

In general, a flexible PCB is used for a cellular phone or printer cable of a folding type used as a mobile communication terminal.

Such flexible PCB is a core part of electric and electronic products that makes it easy to assemble parts and produce reliable products by forming several to dozens of electric wirings on one board for printed circuit disc. These flexible boards are important parts that can be compared to the nervous system, and are electronic parts developed with miniaturization and light weight of electronic products, and have excellent workability, heat resistance, bending resistance, chemical resistance, and especially heat resistance. It is widely used in communication equipment and industrial equipment.

The clamshell-type mobile phone using the flexible board as described above includes a main body and a folder that rotate and open around a hinge, and the main body includes a transmitter including a microphone, and a plurality of key buttons. The keypad (Key-pad) is provided, the folder portion includes a liquid crystal display and a receiving unit including a speaker and the like indicating the letters and numbers.

Such a folding mobile phone is a flexible substrate for supplying various electrical signals and power by connecting the main body and the folder, and an example thereof is illustrated in FIG. 1. The flexible substrate 100 is connected to one end of the rigid substrate 110 is disposed in the folder portion, the other end is connected to the connector 120 and the like for mounting to the main body. In addition, the flexible substrate 100 generally includes a point where the middle portion is bent according to the folder structure of the cellular phone to be mounted.

The flexible substrate 100 must be subjected to a bending test before assembling to a mobile phone. Such a bending test is such that the flexible substrate 100 is repeatedly bent while using a device such as a mobile phone. Because of this, equipment failure due to electrical shorts, etc. occurs, so that the bending test is performed in advance to detect it early.

As such, an apparatus 150 for testing flexural reliability of flexible substrate 100 is shown in FIGS. 2 and 3. The flexural test using the apparatus 150 is performed at the flexible substrate manufacturer side before the flexible substrate 100 is mounted on the apparatus using the apparatus. The flexible substrate 100 is fixed in the test apparatus and repeatedly subjected to the flexural test. will be.

The conventional flexural reliability test apparatus 150 of the flexible substrate as described above has a rotating plate 160 on which the rigid substrate 110 forming one side of the flexible substrate 100 is fixed by the clamp 162 on the base 164. And a support plate 170 on which the connector 120 is fixed by the clamp 172 on the base 164 is disposed so as to be rotatable about the rotation shaft 166, and is opposed to the rigid substrate 110. And the portion of the flexible substrate 100 located between the connector 120 is to be bent freely.

In addition, the rotating plate 160 is driven by a driving means (not shown) provided at one side thereof, for example, an electric motor (not shown) built in the base 164, and the rotating shaft of the rotating plate 160 ( 166 is connected to the drive means by the power transmission means 180 so as to enable power transmission.

The power transmission means 180 includes, for example, a crank shaft that is connected to the rotation shaft of the driving means and a piston rod that is linearly connected to the crank shaft to form a rack gear. In addition, the pinion gear which is engaged with the rack gear is formed on the rotation shaft 166 of the rotating plate 160.

Therefore, when the crank shaft rotates by the operation of the driving means, the rotating plate 160 converts the rotational movement into a linear reciprocating motion through the piston rod, and the linear reciprocating motion is performed through the rack gear and the pinion gear. 166) forward and reverse rotation.

By using the power transmission mechanism, the power transmission means 180 is rotated toward the support plate 170, or vice versa, as shown in Figure 3b) by the operation of the drive means. The operation will be repeated repeatedly.

In addition, the number of bendings and the like made during such an operation is output numerically by the counter 190 provided on one side of the base 164.

In addition, in the conventional test apparatus 150, a resistance measuring device 195 and a monitor 197 are disposed on the flexible substrate 100 to detect the breakage of the flexible substrate 100. The resistance measurement device 195 detects when the flexible substrate 100 is electrically shorted or broken and evaluates the bending reliability of the flexible substrate 100.

However, the bending reliability test apparatus 150 of the conventional flexible substrate as described above can test the bending performance of the flexible substrate 100 to some extent, but this is a state in which the flexible substrate 100 is mounted on a mobile phone or the like. There was a limit that could not be fully simulated.

The conventional test apparatus 150 is to fix the flexible substrate 110 and the connector 120, and to freely bend the flexible substrate 100 connecting therebetween, without any obstacle during the bending of the flexible substrate 100. The bend is made free.

However, when the flexible substrate 100 is mounted on a mobile phone or the like, the flexible substrate 100 passes through a hollow hole that is usually formed in the same portion as the hinge portion, so that the flexible substrate 100 is not bent freely by interference with the mobile phone components forming the hinge portion. I can't.

That is, the flexible substrate 100 is not only bent during the bending operation, but also according to the form of the device on which the flexible substrate 100 is mounted, for example, a mounting part such as a hinge part of a mobile phone, a bending operation or a torsion operation. , Through a complex operation such as a pulling operation or a compression operation, and is subjected to a combination of various external forces by a variety of operations such as to act on the fracture of the flexible substrate (100).

In particular, the bending life is largely dependent on the strain during bending, and the bending strain is affected by the bending radius, and the bending radius is different for each device or device on which the flexible substrate is mounted.

Therefore, since the flexible substrate 100 is bent in the state of bending the flexural reliability test apparatus 150 of the conventional flexible substrate, the bending of the flexible substrate 100 is greatly limited. There is a big difference from the flexural substrate bending performance in the device, and as a result there is a problem that does not guarantee the quality of the equipment or device actually mounted.

The present invention is to solve the above-mentioned conventional problems, the purpose of the flexural reliability of the flexible substrate more accurately by undergoing a bending test under the same conditions as the actual device in the process of testing the bending reliability of the flexible substrate The present invention provides an apparatus for testing flexural reliability of flexible substrates that can be improved.

In addition, another object of the present invention, by accurately grasp the bending reliability of the flexible substrate can be more perfect in the design of the finished product on which the flexible substrate is mounted to improve the flexible substrate to secure an advantage in the technical competitiveness of the finished product To provide a bending reliability tester.

In order to achieve the above object, the present invention, in the device for testing the bending reliability of the flexible substrate,

A rotation means fixed to one end of the flexible substrate by a clamp and mounted to the base to be rotatable about a rotation axis;

Support means for fixing the other end of the flexible substrate with a clamp;

Jig means for simulating the shape of the part of the finished product on which the flexible substrate is mounted between the rotation means and the supporting means, and allows the flexible substrate to pass through therein; And

And a driving means connected to the rotation means to impart a driving force to allow the flexible substrate to repeatedly perform the bending operation. The bending of the flexible substrate is configured to simulate the state in which the flexible substrate is mounted on the finished product. By providing a reliability test apparatus.

Preferably, the present invention is characterized in that the jig means comprises a first jig fixed to the pivot means and a second jig fixed to the support means, wherein the flexible substrate is passed into the first and second jig. By providing a bending reliability test apparatus of the flexible substrate.

And, more preferably, the present invention is to provide a bending reliability test apparatus of the flexible substrate, characterized in that the first and second jigs are arranged to be coaxial with the rotation axis of the jig means.

In still another aspect, the present invention provides an apparatus for flexural reliability testing of a flexible substrate, further comprising an angle adjusting means for adjusting the angle of rotation of the rotating means.

More preferably, the present invention further includes a flexural reliability test of the flexible substrate, wherein the rotation means further includes a rotational speed adjusting means configured to change the rotational speed by passing the deceleration section and the acceleration section during the rotational operation. By providing a device.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

The bending reliability test apparatus 1 of the flexible substrate according to the present invention is to test the flexible substrate 5 by simulating a mobile phone as an example, as shown in FIG.

Flexure reliability test apparatus 1 of the flexible substrate according to the present invention is fixed to one end (5a) of the flexible substrate (5) by the clamp 12, the base 164 to be rotated around the rotating shaft (14) It is provided with a rotating means 10 mounted to.

The rotating means 10 is made of, for example, a rotating plate 10a, and a clamp 12 is mounted on the rear surface thereof to fix one end 5a of the flexible substrate 5, for example, a rigid substrate. The lower end of the rotary shaft 14 is rotatably mounted on the base 164.

In addition, the rotating shaft 14 is connected to a rotating shaft (not shown) of the driving means, which will be described later, and the rotating means 10 performs the repetitive bending operation by the driving means.

In addition, the present invention includes a support means 20 for fixing the other end 5b of the flexible substrate 5, the support means 20 is a support plate protruding on the base 164, for example ( 20a). The supporting means 20 fixes the other end 5b of the flexible substrate 5, for example, a connector portion, on the upper portion of the supporting plate 20a.

In addition, the present invention simulates the part shape of the finished product on which the flexible substrate 5 is mounted between the rotation means 10 and the support means 20, and allows the flexible substrate 5 to pass through the inside thereof. Jig means 30 is provided.

The jig means 30 includes first and second jigs 32, 34 that simulate the hinge portion 210 of the mobile phone 200, as illustratively shown in FIG. The first jig 32 has a structure that simulates the hinge portion 210 of the cellular phone folder portion 212, and opens the first cylindrical portion 33a and the first cylindrical portion 33a to one side. One opening 33b and a first connecting portion 33c for bolting the first cylindrical portion 33a to the pivoting means 10 are included.

In addition, the second jig 34 has a structure that simulates the hinge portion 210 of the mobile phone main body 214 to open the second cylindrical portion 35a and the second cylindrical portion 35a to one side. The second opening 35b and the second connecting portion 35c for bolting the second cylindrical portion 35a to the supporting means 20 are included.

As shown in FIG. 4, the first and second jigs 32 and 34 have first and second cylindrical portions 33a and 35a on the rotating shaft 14 of the rotating means 10. The flexible substrate 5 is arranged side by side to be coaxial, and the first and second cylindrical portions 33a, 35a of the first and second jigs 32, 34 are first and second. It is configured to pass through the interior of the opening (33b) (35b).

In addition, the present invention includes a driving means connected to the rotation means 10 to impart a driving force, thereby allowing the flexible substrate 5 to perform a repetitive bending operation. The drive means is built in the base 164 and its rotation shaft is connected to the rotation shaft 14 of the rotation means 10 through the power transmission means 180.

The drive means is made of a conventional forward and reverse rotation electric motor and the like, the power transmission means 180 is a structure including a crank shaft, a piston rod and rack gear and pinion gears as described above, Of course, it can be achieved by a different power transmission mechanism.

Therefore, since the rotating shaft 14 operatively connected to the driving means through the power transmission means 180 is connected to the bearing block 14a provided in the base 164 so as to be rotatable, the operation of the driving means. Repeated rotation operation to measure the bending performance.

And, the present invention further includes an angle adjusting means 50 that can adjust the rotation angle of the rotating means 10, as shown in FIG.

The angle adjusting means 50 is a support 52 protruding toward the rear surface of the rotating means 10 on the base 164 and the adjusting bolt 54 screwed to the upper end of the support 52, and the adjusting bolt And the buffer material 56 etc. which were formed in the head part of 54. The shock absorbing material 56 is made of a material such as rubber, so as to mitigate noise and impact even when the rear surface of the rotation means 10 is contacted during the rotation operation.

Such an angle adjusting means 50 is able to adjust the length of the buffer member 56 protrudes upwards by adjusting the screwing depth of the adjusting bolt 54 on the support 52, the angle of the rotation means 10 Can be adjusted.

In addition, the present invention further includes a rotational speed adjusting means 70 such that the rotational means 10 undergoes the deceleration section and the acceleration section during the rotational operation so as to change the rotational speed. As shown in FIG. 7, the rotation speed adjusting means 70 has an anchor member 72 fixed to the base 164, one end of which is fixed to the anchor member 72, and the other end of the rotation means ( 10 includes a spring means 74 connected to one side of the anchor member 72, the position of which is located directly below the rotating shaft 14 of the rotation means 10.

Accordingly, the rotational speed adjusting means 70 is shown in FIG. 8B, as shown in FIG. 8A, rather than the tensile length L1 of the spring means 74 when the pivoting means 10 is turned back. As shown in FIG. 8C, the length L2 of the spring means 74 is longer when the rotating means 10 is positioned upright, as shown in FIG. 8C. The length L3 of the spring means 74 when in close contact is shorter than the length L2 when positioned in the upright position.

Therefore, the rotating means 10 is rotated from the state of FIG. 8A) to the state of FIG. 8B) in the bending operation process in the section S1 by increasing the elastic force as the length of the spring means 74 gradually increases. While the means 10 forms a deceleration section that rotates gradually, and while rotating from the state of FIG. 8B) to the state of FIG. 8C), the restoring force increases as the length of the spring means 74 gradually decreases, thereby rotating the means. The acceleration section S2 closes quickly.

In addition, in contrast to the above, in the section S3 rotating from the state of FIG. 8C) to the state of FIG. 8B), the elastic force increases as the length of the spring means 74 gradually increases, and the rotating means 10 gradually rotates. Acceleration section S4 is formed to form a deceleration section, and the restoring force is increased by reducing the length of the spring means 74 while rotating from the state of Fig. 8b) to the state of Fig. 8a) (S4). ).

Such acceleration sections S2 and S4 and deceleration sections S1 and S3 are as if the folder part 212 of the mobile phone 200 rotates about the hinge part 210 with respect to the main body part 214. To simulate more and more similarly.

The bending reliability test apparatus 1 of the flexible substrate according to the present invention configured as described above has one side end 5a of the flexible substrate 5 as shown in FIGS. 6 and 7 in the rotation means 10. It is fixed using the back clamp 12, the flexible substrate 5 is the first and second cylindrical portion (33a) provided in the first and second jig 32, 34 of the jig means 30 ( After passing through 35a), the other end 5b of the flexible substrate 5 is fixed to the support means 20.

In this process, the other end 5b of the flexible substrate 5 has a plurality of jigs 34 of the jig means 30 on the support plate 20a of the support means 20, as shown in FIG. 6. Since the connecting portion 35c is mounted through the bolts 24 of the coupling member, the connecting portion 35c is squeezed between the supporting plate 20a and the connecting portion 35c to be fixed by the bolt 24 or the like.

When the flexible substrate 5 is mounted as described above, the hinge part 210 of which the first and second jigs 32 and 34 of the jig means 30 are connected to the folder part 212 of the mobile phone 200, respectively. And because it has a structure to simulate the hinge portion 210 connected to the main body portion 214, the effect is as if mounted on the mobile phone 200 of the finished product.

That is, the first and second cylindrical portions 33a and 35a of the first and second jigs 32 and 34 correspond to the hinge portion 210 of the mobile phone 200, as shown in FIG. It is provided with a size, a standard, and the like, which are arranged side by side and coaxially coincide with each of the rotation shafts 14 of the pivoting means 10, so that the hinge portion 210 of the mobile phone 200 is accurately simulated.

In the mounted state, the operator operates the driving means of the present invention to repeatedly operate the rotation means 10 as shown in FIGS. 8A to 8C.

In this process, the number of bends of the flexible substrate 5 by the rotation means 10 is counted through the counter 190 as in the prior art, and at the same time, the flexible substrate 5 is connected to the resistance measuring instrument 195 and the monitor. Since electrical connection is made to the reference numeral 197, the time when the flexible substrate 5 is electrically shorted or broken is detected through these, and the bending reliability of the flexible substrate 5 is evaluated.

In addition, the present invention can adjust the angle of rotation of the rotation means 10 through the angle adjustment means 50 can be carried out a flexural test in a state that more and more simulated the bending angle of the mobile phone (200).

In addition, the present invention includes a rotation speed adjusting means 70 to pass through the deceleration section (S1) (S3) and the acceleration section (S2) (S4) during the bending operation more and more similar to the mobile phone of the actual finished product You can run

On the other hand, the present invention is configured in the jig means 30 on the assumption that the flexible substrate 5 is used in the mobile phone, but this is just described by way of example, it can be seen that the present invention is not limited thereto. .

It should be noted that the jig means 30 in the present invention is not limited to the mobile phone alone, but simulates the parts of the device on which the flexible substrate 5 to be tested is mounted.

For example, the present invention simulates the components used in the finished products of notebook computers, mobile phones of different models, various home appliances, communication devices, and industrial devices, and configures the jig means 30 to actually produce the flexible substrate 5. The bend test can be performed as in the state attached to the.

According to the present invention as described above, in the process of testing the bending reliability of the flexible substrate, the flexible substrate 5 is subjected to the bending test by using the jig means 30, which simulates the same conditions as the apparatus to be actually applied The bending reliability of the flexible substrate 5 in the state where the flexible substrate 5 is mounted can be tested, thereby improving the reliability of the test.

In addition, according to the present invention, by more accurately grasp the bending reliability of the flexible substrate (5) as described above, it can be more perfect in the design of the finished product on which the flexible substrate (5) is mounted can achieve the quality of the finished product Of course, the effect that can secure an advantage in technological competitiveness is obtained.                     

While the above has been described in detail with respect to specific preferred embodiments of the invention, the invention is not limited thereto. Although those skilled in the art can make various modifications or equivalent structures of the present invention different from the above embodiments through the description of the specification or the drawings, these are all included in the technical idea of the present invention. In particular, the material change of the components of the present invention, the addition of a simple function, a simple shape change or a dimension change may be presented in various ways, but it is obvious that they are all included within the scope of the present invention.

Claims (13)

In the apparatus for testing the bending reliability of the flexible substrate, A rotation means fixed to one end of the flexible substrate by a clamp and mounted to the base to be rotatable about a rotation axis; Support means for fixing the other end of the flexible substrate with a clamp; Jig means for simulating the shape of the part of the finished product on which the flexible substrate is mounted between the rotation means and the supporting means, and allows the flexible substrate to pass through therein; And And a driving means connected to the rotation means to impart a driving force to allow the flexible substrate to repeatedly perform the bending operation. The bending of the flexible substrate is configured to simulate the state in which the flexible substrate is mounted on the finished product. Reliability Tester.       The jig means according to claim 1, wherein the jig means comprises a first jig fixed to the rotation means and a second jig fixed to the support means, wherein the flexible substrate is passed into the first and second jig. Flexibility reliability test apparatus for flexible substrates.       The bending reliability test apparatus according to claim 2, wherein the first and second jigs are arranged to be coaxial with the rotation axis of the jig means.       3. The first jig has a structure designed to simulate a hinge portion of a cellular phone folder portion, a first cylindrical portion, a first opening for opening the first cylindrical portion to one side, and a rotation means for rotating the first cylindrical portion. A first connection for bolting to The second jig has a structure designed to simulate the hinge portion of the mobile phone main body portion, a second cylindrical portion, a second opening for opening the second cylindrical portion to one side, and a second portion for bolting the second cylindrical portion to the supporting means. Flexural reliability test apparatus for a flexible substrate comprising a connecting portion.       The second jig of the jig means has a connecting portion mounted on the supporting plate of the supporting means through a plurality of bolts, thereby securing the other end of the flexible substrate between the supporting plate and the connecting portion. Flexibility reliability test apparatus of the flexible substrate, characterized in that configured to.       The bending reliability test apparatus according to claim 1, further comprising an angle adjustment means for adjusting a rotation angle of the rotation means. The rotating means according to claim 6, wherein the angle adjusting means includes a support projecting from the base toward the rear surface of the pivoting means, an adjusting bolt screwed to an upper end of the support, and a cushioning material formed on the head of the adjusting bolt. Flexibility testing device for a flexible substrate, characterized in that the rear surface of the flexible substrate is configured to mitigate noise and impact even when the contact.       The bending reliability test apparatus according to claim 1, further comprising a rotation speed adjusting means configured to change the rotation speed by passing the deceleration section and the acceleration section during the rotation operation.       According to claim 8, The rotational speed control means is a flexible member characterized in that it comprises an anchor member fixed to the base, one end is fixed to the anchor member, the other end is connected to one side of the rotation means Bending reliability tester of substrate. 10. The bending reliability test apparatus according to claim 9, wherein the anchor member is positioned directly under the rotation shaft of the pivoting means.       9. The rotational speed adjusting means according to claim 8, wherein the rotational speed adjusting means has a longer length of the spring means when the rotating means is positioned upright than the tension length of the spring means when the rotating means is turned rearward. The length of the spring means when in close contact with the support means is formed shorter than the length when it is located in the upright to form a deceleration section and the acceleration section, characterized in that the flexural reliability testing apparatus of the flexible substrate.       The apparatus of claim 1, further comprising a counter for counting the number of bends of the flexible substrate by the pivoting means.       The apparatus of claim 1, further comprising a resistance meter and a monitor electrically connected to the flexible substrate to detect an electrical short or break of the flexible substrate.

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