KR20080050808A - Fixing jig for pcb - Google Patents

Abstract

A fixing jig for a PCB(Printed Circuit Board) is provided to prevent unnecessary friction between a support pin and a guide pin even though an angle of the support pin is changed in the course of move-up and down of the support pin by making an installation separation distance between a lower case and the guide pin larger than the distance between the support pin and a through-hole of an upper case. A fixing jig for a PCB includes a body(100), guide pins(40), elastic members(50), a sliding member(60), an operation member(70), and a support pin(30). The sliding member has through-holes for housing the guide pin and the elastic members. The sliding member is held in a lower case(10) to be slid in a horizontal direction. The operation member allows the sliding member to be slid and fixed. The support pin is connected to a top portion of each of the guide pins and is installed to penetrate an upper case(20). The guide pin is installed in the lower case by a non-fixing method to vary with angles of the support pint and the guide pin by a gap between the support pin and the through-hole of the upper case.

Description

Fixing jig for PCB {Fixing jig for PCB}

1a to 1c is a partial cross-sectional view showing the coupling and operation of the support pin and the guide pin of the conventional fixed support

2 is an exploded perspective view of the present invention;

Figure 3 is an exploded perspective view showing the bottom of the present invention

Figure 4 is a cross-sectional view showing the overall coupling state of the present invention

5 is a perspective view showing the appearance of the present invention

Figure 6 is a cross-sectional view showing a state where the PCB substrate is raised in the present invention

7a and 7b is an enlarged partial cross-sectional view showing a coupling and operation state between the support pin and the guide pin of the present invention

8 and 9 is a cross-sectional view and a plan view showing a state of fixing the position of the support pin through the fixing lever and the sliding means

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

  10: lower case 14: insertion groove

 20: upper case 30: support pin

  32: seating piece 34: insertion hole

  40: guide pin 42: guide

  44: insertion unit

In general, the PCB substrate is subjected to a soldering process through equipment such as a screen printer or chip mounter during the manufacturing process.

When the soldering process is performed, the PCB substrate should be fixed in a state where it is accurately leveled to prevent bending of the substrate and to prevent installation of the electronic chip installed on the substrate.

As a conventional apparatus for horizontally fixing PCB substrates in the soldering process, a board fixing apparatus of one type can be maintained by simply placing support pins of the same length on the upper surface of the main body so that the upper PCB substrate is placed thereon. It is proposed.

However, in the conventional fixing device, when various chips or parts of the PCB board are placed on each support pin, the parts without the chip of the PCB board are floating in the air at a predetermined distance from the support pin, and thus the fixing state is unstable. In the soldering process, the load is concentrated on the chip, which may be damaged.

In order to prevent this, the support pin supporting the chip of the board is removed while the PCB board is mounted on the fixing device so that the support pin can support only the board, but this also removes the support pin supporting the chip. There was a problem that the process itself is delayed because it has to be carried out separately.

In order to eliminate the problems of the prior art as described above, the height adjustment of each support pin can be made separately, so that the fixing paper that can support the chip and the substrate together without having to remove the support pin for supporting the chip Earth has been proposed.

Such a conventional circuit board fixing support includes Korean Patent Application No. 2005-52869 "Jig device for fixing a printed circuit board."

The prior art is a plurality of guide pins (2) integrally standing on the lower case (1) as shown in Figure 1a and 1b, and

An elastic means 3 inserted into the guide pin;

A support pin (4a) having a lower end seated on each elastic means (3) and into which a guide pin (2) can be inserted, is formed through the through hole (5a) of the upper case (5). 4) and,

The sliding means 6 is positioned between the support pins 4 and installed to be in contact with and spaced apart from the support pins 4.

In this configuration, when the PCB substrate 7 is placed on the support pins 4, the support pins 4 are lowered by the weight of the PCB board 7, wherein each support pin 4 is individually Since the state is seated on the elastic means 3, the falling length of the support pin for supporting the chip and the support pin for supporting the substrate is different due to the height difference between the chip 7a and the substrate 7b.

In this state, although not shown in the drawing, the sliding member 6 is moved to fix the position of the supporting pin 4 by pressing the seating portion 4b of the supporting pin 4.

As a result, each support pin 4 can support both of the chip 7a and the substrate 7b regardless of the height difference, so that the horizontal state of the PCB 7 can be maintained accurately.

However, this conventional technology has the following problems.

First, in order for the support pins 4 to be smoothly moved up and down along the through holes 5a of the upper case 5, an appropriate installation tolerance between the through holes 5a and the support pins 4, that is, a certain distance between each other (A) ) Must be formed, and the spacing (B) should also be formed between the insertion hole (4a) and the guide pin (2) of the support pin (4).

Therefore, the support pin 4 is lowered in a state in which the support pin 4 is inclined at a predetermined angle (C) rather than in the vertical direction during the ascending and descending intervals (A).

On the other hand, as shown in the drawings, the guide pin 2 is integrally installed with the lower case 1, and thus maintains the vertical state at all times, so that the support pins 4 and the guide pins 2 are as shown in FIG. It is in a state of being distorted at a certain angle rather than collinear.

Therefore, the lower end of the support pin 4, the upper end of the guide pin 2 and the inner wall surface of the insertion hole (4a) of the support pin 4 hit each other, there is a problem that the lifting and lowering is not made smoothly by the locking phenomenon .

Of course, this problem may be solved by increasing the separation distance (B) between the insertion hole (4a) and the guide pin (2), but if the separation distance (B) is excessively increased, the support pin (which is a fundamental function of the guide pin (2) ( 4) There is a problem in that the lifting guide can not act.

Second, since the elastic means (3) used in the prior art is compressed in the form of a general straight spring form when stacked in the form of compression, even if the state is completely compressed by the lowering of the support pin (4) to maintain a certain height (D) do.

Therefore, when the support pin 4 supports a particularly high part of the components attached to the PCB board 7, the support pin 4 cannot be lowered to the proper position by the height of the elastic means 3. The problem that the substrate 7 is not level is generated.

Third, the seating portion 4b of the support pin 4 has a rectangular shape, and at one side thereof, a protrusion 4c is formed in direct contact with the sliding member.

If any one of these support pins 4 is lowered in the rotated state as shown in FIG. 1C and the seating edge is in contact with the sliding member 6, the contact between the remaining support pins and the sliding cannot be made and the rest of the support pins cannot be made. Since the position is not fixed, there is a problem in that the fixing function of the circuit board cannot be exhibited at all.

The present invention is to solve the problems of the prior art as described above,

First, by improving the shape of the guide pin and the coupling method of the case, even if the support pin is raised and lowered in the tilted state to minimize the jamming phenomenon between the support pin, the guide pin and the case printing that can be raised and lowered smoothly It is an object to provide a fixed support for a circuit board.

Second, by improving the structure of the elastic means to maximize the falling length of the support pin, it is an object of the present invention to provide a fixed support of the printed circuit board that can be applied to various types of PCB board.

By improving the structure of the set material, the support pins to ensure constant contact with the sliding means at all times even when the support pin is rotated, to provide a fixed support of the printed circuit board that can solve the conventional problem that the position of the support pin is not fixed The purpose.

The fixed support of the printed circuit board of the present invention proposed to solve the above object is the main body consisting of upper and lower cases,

Guide pins coupled to the lower case,

Elastic means inserted into the guide pins;

Sliding means is installed in the lower case so as to be located between each guide pin;

A support pin which is lifted up and down along the guide pin while penetrating the upper case and having one end coupled to each of the guide pins;

By operating the sliding means has a basic configuration comprising an operation means for fixing and releasing the position of the support pin.

In this basic configuration, the guide pin is installed on the lower case in a non-fixed manner, but is installed to be inclined together according to the inclination angle of the support pin.

With reference to the configuration illustrated in the drawings to describe an embodiment of the specific configuration and operation of the present invention.

For reference, the spacing interval between the through-hole and the support pin of the case shown in the drawings, the spacing interval between the guide pin and the lower case installation groove is shown exaggerated, this is for convenience of explanation and understanding, the present invention regardless of the spacing interval Applicable.

The fixed support 100 of the printed circuit board of the present invention includes a support pin 30 supporting the PCB 200 in a state in which the main body 100 and all the components 100 are installed in the main body 100 and the support pins. Guide pin 40 for guiding the lifting and lowering of the 30, the elastic means 50 for the automatic lifting of the support pin 30, the sliding means 60 for fixing and releasing the position of the support pin 30 And an operating means 70 for operating the sliding means 60.

As shown in FIG. 2, the main body 100 includes the support pin 30, the sliding means 60, the lower case 10 in which the elastic means 50 is accommodated, and the support pin 30 are installed. It is divided into an upper case 20.

The lower case 10 is a rectangular parallelepiped enclosure, and both sides of the upper surface are provided with fixing protrusions 12 and bolt holes 13 for coupling with the upper case 14.

And the inner bottom surface is formed with a plurality of insertion grooves 14 for installing a guide pin 40 to be described later at a predetermined interval. The insertion groove 14 is formed to form a step, that is, the guide pin 40 is formed in the form of the auxiliary groove is not formed deeper than the insertion groove around the insertion groove 14 is inserted directly.

In addition, as shown in FIG. 3, the outer bottom surface of the lower case 10 is formed with a predetermined depth of the recess groove 15 at intervals, the embed groove 15 in the magnet for fixing the main body 100 to the work table ( M) is buried.

The reason for embedding the magnet (M) is to prevent the position of the fixed support in the process of mounting the PCB substrate on the fixed support during soldering operation. That is, because the device such as a screen printer or a chip mounter in which the fixing support is installed is made of metal, it is possible to easily fix the position and detachment by magnetic force without using a separate fixing bolt for fixing the fixing support.

In addition, the magnet (M) is to be removable to the lower case 10 through a bolt (not shown) to be able to adjust the number to obtain a desired fixing force.

The upper case 20 is coupled to the upper portion of the lower case 10,

The upper case 20 has the same shape as the lower case 10, and fixing grooves 22 corresponding to the fixing protrusions 12 of the lower case 10 are formed on both sides of the bottom surface, and the fixing grooves 22 On both sides of the) is formed a bolt hole 23 in communication with the bolt hole 13 of the lower case (10).

In addition, an inner bottom surface of the support ribs 24 protrudes in the same line as the insertion groove of the lower case, and each support rib 24 has a through hole 25 to which the support pins 30 to be described later are formed. It is ..

And one side of the upper case 20 is provided with an operating means 70 consisting of a cam-shaped fixing lever 72 and a fixing rod 74 for operating the sliding member 60 to be described later.

Before the main body 100 described above, the upper and lower cases 20 and 10, the support pin 30 and the elastic means 50 and the guide pin 40, the upper and lower cases 20 ( First install in 10).

The guide pin 40 is composed of a guide portion 42 which serves as a guide of the support pin 30 in the form of a rod as a whole and an insertion portion 44 inserted into the insertion groove 14 of the lower case 10.

The guide portion 42 has a jar shape in which the diameter (E) of the upper end portion and the diameter (F) of the lower end portion are the same, but the diameter (G) increases toward the middle portion. At this time, the diameter difference between the middle part and the upper and lower ends is manufactured to be more than about 0.05mm. However, the diameter difference is not limited to the above dimensions but may be adjusted upward or downward according to the overall size of the fixed support.

And the insertion portion 44 is located at the lower end of the guide portion 42, is formed larger than the maximum diameter of the guide portion 42 but artificially smaller than the diameter of the insertion groove 14 insertion groove 14 Produced so as to form a constant spacing and (H). At this time, the clearance between the insertion groove 14 and the insertion portion 44 is to be formed artificially larger than the spacing (I) between the support pin 30 and the through-hole 25 of the upper case 20 to be described later.

The reason for producing the guide portion 42 and the insertion portion 14 of the guide pin 40 in the form as described above is to help the smooth lifting of the support pin 30, the detailed description will be described in the operation process to be described later do.

The guide pin 40 made of this configuration is coupled to the elastic means 50 for the automatic lifting of the support pin 30, the elastic means 50 is a general compression spring form the diameter of the larger toward the upper end from the lower end It consists of forms.

At this time, the diameter of the lower end is almost the same as the diameter of the lower end (F) of the guide pin (40) guide 42, the diameter of the upper end is almost the same as the diameter (J) of the mounting piece 32 of the support pin 30 to be described later By making it so as to prevent the elastic means 50 from shaking when inserted into the guide pin 40, the support area of the support pin 30 is widened as much as possible so that it can be squeezed stably when the support pin 30 is lowered. do.

The support pin 30 is installed to penetrate a part of the through-hole 25 of the upper case 20, a rod shape similar to the guide pin 40 and the insertion hole for the insertion of the guide pin 40 therein 34 is formed.

And the lower portion is provided with a seating piece 32 of a flange shape larger than the diameter of the upper case 20 through hole 25, the seating piece 32 is seated on the upper end of the elastic means 50 as described above As a part, unlike the seating part of the prior art, it consists of a disk shape.

In addition, the upper end of the support pin 30, that is, the portion in contact with the PCB substrate is covered with a soft cap 36 to prevent the substrate from being damaged when the PCB substrate is seated.

The sliding means 60 is located between the lower case 10 and the upper case 20 in which the guide pin 40, the elastic means 50, and the support pins 30 are installed.

The sliding means 60 is a device for fixing the position of the support pin 30 lowered by the PCB substrate, it is made shorter than the length of the inner space of the lower case 10 and the upper case 20.

In the middle of the upper surface, a plurality of first through holes 62 through which the support pins 30 and the guide pins 40 can pass are formed in the longitudinal direction, and on one side of each of the first through holes 62. The semi-circular second through hole 64 is formed to communicate with the first through hole 62.

In addition, as shown in FIG. 3, each of the second through holes 64 has a rod-shaped contact piece 66 having a diameter substantially equal to the diameter of the second through holes 64. That is, since the second through hole 66 has a semicircular shape, half of the contact piece 66 is coupled in a state of protruding into the first through hole 62.

The contact piece 66 is a part in direct contact with the support pin 30 for fixing the support pin 30. The contact piece 66 is contacted with the support pin 30 using a urethane and soft material. In addition, it is preferable to prevent damage to the support pin 30.

The same through-holes are formed on both sides of the first and second through-holes 62 and 64 formed at the center of the sliding means 60. In this case, each of the third through-holes 68 formed on both sides has an outer wall surface open. Produced in the form to reduce the overall weight of the sliding means (60).

In addition, a spring 80 is provided between one end of the sliding means 60 and the inner wall of the lower case 10 to automatically return the changed position of the sliding means 60.

Hereinafter, a description will be given of the coupling process between the above components.

First, the insertion portion 44 of the guide pin 40 is inserted into each insertion groove 14 of the lower case 10 as shown in FIG. At this time, the entire guide pin 40 including the insertion portion 44 by the separation distance (H) between each insertion groove 14 and the insertion portion 44 can be moved in a constant distance in all directions in the insertion groove (14). In addition, the angle change can be made freely.

Then, the lower end of the elastic means 50 is extrapolated to the guide portion 42 of each guide pin 40 to be seated on the upper surface of the insertion portion 44. At this time, the diameter of the lower end of the elastic means 50 is almost the same as the lower diameter (F) of the guide portion 42 of the guide pin 40 so as not to shake from side to side in the coupled state.

When the coupling of the guide pin 40 and the elastic means 50 is completed, the guide means 40 are inserted into each of the first through holes 62 of the sliding means 60 so that the sliding means 60 is lowered. It is to be seated on the inner bottom surface of the case (10).

At this time, since the height of the sliding means 60 is made higher than the inner height of the lower case 10, a portion of the upper side of the sliding means 60 is positioned so as to rise from the lower case 10.

In addition, since the length of the sliding means 60 is made shorter than the length of the inner space of the lower case 10, a gap portion K of a predetermined distance is formed between one end of the seated sliding means 60 and the lower case 10. The spring 80 is inserted into the gap portion K.

The sliding means 60 is pushed in the opposite direction by the force of the spring 80, the opposite end of the sliding means 60 is pushed toward the inner wall surface of the lower case 10 to be in contact with the wall surface.

When the coupling of the sliding means 60 is completed, each of the support pins 30 passes through the through hole 25 of the upper case 20 thereafter, and each of the support pins 30 is a seating piece ( 32) is prevented from being caught by the support ribs and exiting upwards.

Then, in the state in which the support pins 30 are coupled to each other, the upper case 20 is combined in a form of covering the upper surface of the lower case 10, wherein each fixing protrusion 12 of the lower case 10 is an upper case. Coupling so as to be inserted into the fixing groove 22 of the (20) and fasten a separate fixing bolt (not shown) to the bolt hole to fix the upper and lower cases 20, 10 coupled to each other.

In this process, the support rib 24 of the upper case 20 is inserted into the first through hole 62 of the sliding means 60, and the seating piece 32 of the support pin 30 is elastic means 50 The upper part of the guide pin 40 is seated in the insertion hole 34 of the support pin 30 is seated on the upper end of the).

In this case, since the upper end diameter F of the guide pin 40 is smaller than the middle portion diameter G, a predetermined gap L is formed between the upper end of the guide pin 40 and the inner wall surface of the insertion hole 34 of the support pin 30. ) Is formed.

When the assembly is completed as described above, as shown in FIG. 5, each of the support pins 30 protrudes on the upper case 20.

Hereinafter will be described the operation and effects of the present invention so coupled.

First, the fixed support coupled to the soldering apparatus is installed at an appropriate position. At this time, the position is easily fixed by the magnet M installed in the lower case 10.

Thereafter, as shown in FIG. 6, when the PCB 200 is placed on the upper end of the support pin 30, each support pin 30 is lowered to some extent by the weight of the PCB 200, but the substrate 210 is lowered. By the height difference between the chip 220 and the support pin for supporting the chip 220 is lowered than the support pin for supporting the substrate can be maintained as a whole horizontal.

As the support pin 30 descends as described above, the support pin 30 is in the upper case 20 according to the contact state of the substrate 210 or the chip 220 as shown in FIGS. 7A and 7B. In the spaced distance (I) with the through hole 25 of the down occurs in a state inclined at a predetermined angle (N),

At this time, the upper end of the guide pin 40 is inserted into the insertion hole 34 of the support pin 30, and between the insertion portion 44 of the guide pin 40 and the insertion groove 14 of the lower case 10. Since the separation distance H is made larger than the separation distance I between the support pin 30 and the through-hole 25 of the upper case 20, the guide pin 40 has the same slope as the support pin 30. It will be inclined to.

When the support pin 30 comes down in this state, as shown in FIG. 7b, the support pin 30 and the guide pin 40 are inclined at the same angle, so that the support pin 30 is positioned on the same line. The upper end of the guide pin 40 is not caught by the inner wall of the insertion hole 34.

If the separation distance between the guide pin 40 insertion portion 44 and the lower case 10 insertion groove 14 is smaller than the separation distance between the support pin 30 and the through hole 25, the guide pin () is a support pin Since it can be inclined only within an angle smaller than the inclination of (), the guide pin 40 and the support pin 30 are not positioned on the same line as the problems of the prior art, so the upper end of the guide pin 40 in the ascending and descending process. And interlocking between insertion holes 34 of the support pins 30 occur.

In addition, when the angle difference between the support pin 30 and the guide pin 40 becomes too large, an excessive load is applied to the support pin 30 or the insertion portion 44 of the guide pin 40 is inserted into the groove 14. There exists a possibility that the phenomenon which deviates from may arise.

Thus, the present invention, unlike the prior art, the guide pin 40 is installed in a non-fixed manner to the lower case 10, the installation clearance between the lower case 10 and the guide pin 40 support pin and the upper One of the greatest features of the present invention is to prevent unnecessary friction with the guide pin 40 during the ascending and descending process of the support pin 30 by artificially forming a larger distance than the separation distance between the case 20 through holes 25. .

And as shown in Fig. 9b, the guide pin 40 has a diameter G of the middle portion of which is substantially the same as the diameter of the insertion hole 34 of the support pin 30, but the upper and lower end diameters E and F are formed smaller than that. Since the support pin is lowered by the gap P formed between the inner wall of the insertion hole 34 and the upper end of the guide pin 40, the phenomenon that the upper end of the guide pin 40 is caught by the inner wall of the insertion hole 34 is further prevented. do.

In this way, by improving the guide pin 40 to have a smaller diameter (E) (F) of the upper and lower ends compared to the middle portion, it is to help the ascending and descending of the support pin 30 more smoothly among the other features of the present invention One.

In addition, as the support pin 30 descends, the elastic means 50 supporting the seating piece 32 of the support pin 30 is also squeezed together, wherein the elastic means 50 has an upper end diameter compared to the lower end diameter. Since it is largely formed, when the maximum compression is performed, the tension portion of each spring tension portion having a larger diameter is compressed in a form that is extrapolated to a tension portion of a smaller diameter, so that the top end of the elastic means 50 is eventually guide pin ( Compression is possible even to the extent down to the upper surface of the insertion portion 44 of the 40.

That is, even if the support pin 30 supports the chip which protrudes a lot, the length of the descending length is increased, so that the upper end of the elastic means 50 can be compressed to the floor as described above. Even if the compression is maintained a certain height can solve the problem that the support pin is no longer lowered by the spring.

In addition, the lower end diameter of the elastic means 50 is made almost the same as the diameter (F) of the lower end of the guide portion (40) of the guide pin 40, the elastic means 50 in the process of pressing the elastic means 50 is not shaken Not only can be squeezed stably, but also the upper end diameter is made almost the same as the diameter of the seating piece 32 of the support pin 30 can support the seating piece 32 over a larger area, more stable crimping There is also an advantage that can be achieved.

If the PCB substrate 200 is maintained horizontal through this process, it is necessary to fix the position of the support pins 30 for the horizontal maintenance of the PCB substrate 200 before the soldering process. To this end, as shown in FIG. 8, when the fixing lever 72 is folded upward, the fixing rod 74 is protruded by the fixing lever 72 to push out one end of the sliding means 60, and eventually the sliding means 60. ) The whole will move to the other side.

In this process, as shown in FIGS. 8 and 9, the contact pieces 66 installed in the second through holes 64 of the sliding means 60 are in contact with the seating pieces 32 of the support pin 30. The piece 66 is continuously pushed to one side. By this force, the support pin 30 does not rise and is fixed at the position.

At this time, even if the support pin 30 is rotated in the descending process, since the seating piece 32 is in the shape of a disc, the contact surface with the contact piece 66 is always the same. Therefore, as the conventional mounting piece 32 is made of a square, it is possible to prevent the phenomenon that the fixing of the support pin 30 is not made.

 Then, after the soldering process is completed, the PCB 200 is separated from the fixing support, and when the fixing lever 72 is operated in reverse, the force pushing the sliding means 60 as the fixing rod 74 retreats backward. Simultaneously with the release, the sliding means 60 is slid to the opposite side by the elastic force of the other spring 80.

In this process, the seating piece 32 of the support pin 30 and the contact piece 66 of the sliding means 60 are separated, and the support pin 30 is elevated by the elastic force of the elastic means 50 to its original position. Is returned.

Various features of the fixing support of the printed circuit board according to the present invention described with reference to the drawings can be variously modified and combined by those skilled in the art, these modifications and combinations are coupled to the guide pin and the lower case in a non-fixed manner However, if it is always associated with the configuration and effects combined so that the support pin and guide pin to form the same angle should be interpreted as belonging to the protection scope of the present invention.

As described above, the fixing support of the printed circuit board according to the present invention,

First, the guide pin is installed in the lower case in a non-fixed manner, but the support pin in the ascending and descending process of the support pin by artificially forming the distance between the lower case and the guide pin artificially larger than the distance between the support pin and the upper case through space. Even if the angle of is changed, there is an advantage that can prevent unnecessary friction with the guide pin.

Second, the guide pin is improved so that the diameter of the upper and lower ends is smaller than that of the middle part so that a gap is formed between the inner wall of the insertion hole of the support pin and the upper end of the guide pin. There is an advantage that the contact between the upper end and the support pin can be more easily prevented.

Third, the elastic means is manufactured in the form of a light-lower strait, which not only prevents the elastic means from shaking during the pressing process but also supports the support pin more stably, and also compresses the elastic means so that the height thereof is hardly formed. Since the rate can be obtained, there is an advantage that the lowering length of the support pin can be secured longer.

Fourth, by implementing the seating piece of the support pin in the form of a flange of the disc, even if the support pin rotates in the process of falling can always be made uniform contact with the sliding means there is an advantage that the position of the support pin can be smoothly made.

Claims (5)

The main body is divided into an upper case and a lower case, A guide pin positioned in a form erected on the lower case, An elastic means inserted into the guide pin along a length direction; Sliding means is formed on the lower case so that the guide pin and the through-hole receiving the elastic means is formed to slide in a horizontal direction; An operation means installed on the main body for sliding and fixing the sliding means; A lower end portion is connected to the upper portion of the guide pin and includes a printed circuit board fixing support configured to include a support pin installed through the upper case, The guide pins are installed in a non-fixed manner with the lower case so that the angles of the support pins and the guide pins may be changed together by the clearance between the support pins and the upper case through-spaces. Earth. The method of claim 1, An installation groove is formed in the lower case, and the guide pin includes an insertion portion inserted into the installation groove and a guide portion protruding from the insertion portion. The tolerance between the diameter of the installation groove and the insertion portion diameter is Printed circuit board fixing support, characterized in that formed to be more than the tolerance between the diameter of the through hole and the diameter of the support pin. The method of claim 2, The guide portion of the guide pin is fixed to the printed circuit board, characterized in that configured in the form of a larger diameter toward the middle portion from the upper end and the lower end. The method of claim 1, The lower portion of the support pin is a printed circuit board fixing support, characterized in that the disk-like mounting piece is formed along the outer circumference, the seating piece is seated on the upper end of the elastic means. The method of claim 1, wherein The elastic means is in the form of a spring, the diameter of the lower end is almost the same as the diameter of the lower end of the guide pin, the diameter becomes larger toward the upper end consisting of the diameter of the upper end is almost the same as the seating piece diameter of the support pin Printed circuit board fixing support.

Images