TW201618617A - Circuit board holder - Google Patents

Abstract

A circuit board holder includes a first carrier board, a second carrier board, and two magnetic attraction members. The first carrier board includes a first hole. The second carrier board includes a second hole. The two holes are respectively disposed in the first hole and the second hole. When the first carrier board and the second carrier board are stacked mutually, the two magnetic attraction members generate a magnetic attraction force to be attracted with each other so that a printed circuit board is allowed to be tightly sandwiched between the first carrier board and the second carrier board. At this moment, the printed circuit board is located between the two magnetic attraction members, and the magnetic attraction force is between 168 gauss and 550 gauss.

Description

Circuit board fixture

The present invention relates to a circuit board fixture.

Due to the stress deformation and temperature change of the printed circuit board, the process often causes inconvenience in the process, and the printed circuit board must be clamped by the circuit board fixture, thereby pressing the printed circuit board to make it unable to warp. , shifting or morphing, thus avoiding problems such as difficulty in machining and inaccurate offset of parts.

However, since the electronic circuit of the current printed circuit board is quite precise, if the clamping force of the circuit board fixture is too large, the circuit board may be damaged, resulting in damage to the electronic circuit design on the printed circuit board.

In view of this, how to provide a solution that can effectively improve the above-mentioned shortcomings and inconveniences is an important issue that the relevant industry is currently unable to delay.

SUMMARY OF THE INVENTION The present invention is directed to a circuit board fixture for solving the inconveniences and drawbacks mentioned in the prior art.

The circuit board fixture includes a first carrier board and a second carrier a plate, at least one first magnetic body and at least one second magnetic body. The first carrier plate has at least one first slot. The second carrier plate has at least one second slot. The first magnetic body and the second magnetic body are disposed in the first and second holes, respectively. In this way, when the first carrier plate and the second carrier plate are covered with each other, the first magnetic body and the second magnetic body are magnetically attracted to each other, so that a printed circuit board can be clamped to the first carrier plate and the second carrier plate. between. At this time, the printed circuit board is interposed between the first magnetic body and the second magnetic body.

The circuit board jig of the invention utilizes the magnetic attraction principle to make the first carrier plate and the second carrier plate closely attract, so that the printed circuit board is pressed to make it unable to warp, shift or deform, thereby effectively improving the printed circuit board Problems such as songs, shifts or variants.

In addition, since the inventors have found that the magnetic attraction generated by the magnetic interaction between the first magnetic body and the second magnetic body is too large, the printed circuit board is pressed or even damaged, resulting in the design of the electronic circuit on the printed circuit board. damage. Therefore, after many experiments, the inventors finally found out that once the magnetic attraction strength of the first magnetic body and the second magnetic body is between 168 gauss and 550 gauss, the printed circuit board can be firmly clamped to Between the first carrier plate and the second carrier plate, but not damaged.

In accordance with one or more embodiments of the present invention, the first carrier plate has two opposing first and second faces. The first hole slot is located on the first side of the first carrier plate. The second carrier plate has two opposite third and fourth faces. The second slot is located on the third side of the second carrier. Therefore, when the first carrier board and the second carrier board are covered with each other, the first side of the first carrier board and the third side of the second carrier board respectively touch the printed circuit board.

According to one or more embodiments of the present invention, the first carrier plate further has at least one first fine hole. The first fine hole is located on the second surface of the first carrier plate, and the first hole is opened. The diameter of the first pore is smaller than the diameter of the first orifice.

According to one or more embodiments of the present invention, the second carrier plate further has at least one second hole, and the second hole is located on the opposite fourth side of the second carrier plate, and the second hole is opened. The diameter of the second pore is smaller than the diameter of the second orifice.

According to one or more embodiments of the present invention, the first carrier plate further has at least one first opening. The first opening penetrates the first surface and the second surface of the first carrier. When the printed circuit board is sandwiched between the first carrier and the second carrier, the first opening exposes a portion of the printed circuit board.

According to one or more embodiments of the present invention, the second carrier plate further has at least one second opening. The second opening penetrates through the third surface and the fourth surface of the second carrier plate. When the printed circuit board is sandwiched between the first carrier and the second carrier, the second opening exposes a portion of the printed circuit board.

According to one or more embodiments of the present invention, the first aperture has a first depth. The second slot has a second depth. The first depth and the second depth are respectively in the range of 2.1 mm to 2.8 mm.

In accordance with one or more embodiments of the present invention, the first magnetic body has a first thickness that is less than the first depth, and the second magnetic body has a second thickness that is less than the second depth. The first thickness and the second thickness are respectively in the range of 1.8 mm to 2.0 mm.

According to one or more embodiments of the present invention, the first slot has a first depth, the first magnetic body has a first thickness smaller than the first depth, wherein the first depth and the first thickness are in a range of 0.3 mm to 0.7 mm, and the first magnetic body The magnetic attraction strength produced by the body ranges from 200 Gauss to 260 Gauss.

According to one or more embodiments of the present invention, the minimum linear distance between the top surfaces of the first magnetic body and the second magnetic body facing each other is in a range formed by 0.6 mm to 1.4 mm, and The magnetic attraction strength generated by the first magnetic body ranges from 200 gauss to 520 gauss.

According to one or more embodiments of the present invention, the first magnetic body is matched and fitted into the first hole by means of riveting and die casting. More specifically, the inner wall of the first hole is pressed against a side of the first magnetic body exposing a notch of the first hole, wherein a minimum diameter of the notch of the first hole is smaller than the first A maximum width of the magnetic body.

According to one or more embodiments of the present invention, the second magnetic body is matingly fitted into the second hole by means of riveting and die casting. More specifically, the inner wall of the second hole is pressed against the side of the second magnetic body exposing one of the slots of the second hole, wherein a minimum diameter of the notch of the second hole is smaller than the second A maximum width of the magnetic body.

10, 11‧‧‧ circuit board fixture

100‧‧‧First carrier board

110‧‧‧ first side

120‧‧‧ second side

130‧‧‧first opening

140‧‧‧First slot

141‧‧‧ notch

150‧‧‧ first pore

160‧‧‧First magnetic body

200‧‧‧Second carrier board

210‧‧‧ third side

220‧‧‧ fourth side

230‧‧‧second opening

240‧‧‧Second hole

250‧‧‧Second pores

260‧‧‧Second magnetic body

300‧‧‧Printed circuit board

A1‧‧‧first depth

A2‧‧‧second depth

T1‧‧‧first thickness

T2‧‧‧second thickness

W1‧‧‧ first width

W2‧‧‧ second width

1 is an exploded view of a circuit board fixture according to an embodiment of the present invention.

Fig. 2 is a combination diagram of Fig. 1.

Fig. 3 is a cross-sectional view taken along line AA of Fig. 2.

Fig. 4 is a cross-sectional view showing a circuit board fixture according to another embodiment of the present invention, the cross-sectional position of which is the same as that of Fig. 3.

The spirit and scope of the present invention will be apparent from the following description of the preferred embodiments of the invention. The spirit and scope of the invention are not departed.

In order to solve the problems of warpage, displacement or modification of the conventional printed circuit board, the present invention provides a circuit board fixture to effectively improve the problem. 1 is an exploded view of a circuit board fixture 10 according to an embodiment of the present invention. Fig. 2 is a combination diagram of Fig. 1. Fig. 3 is a cross-sectional view taken along line AA of Fig. 2.

Please also refer to Figure 1, Figure 2 and Figure 3. The circuit board fixture 10 includes a first carrier board 100, a second carrier board 200, a plurality of first magnetic bodies 160 and a plurality of second magnetic bodies 260. The first carrier plate 100 has a plurality of first aperture slots 140. The second carrier plate 200 has a plurality of second holes 240. The first magnetic body 160 and the second magnetic body 260 are disposed in the first hole 140 and the second hole 240, respectively. When the first carrier plate 100 and the second carrier plate 200 are covered with each other, the first magnetic body 160 and the second magnetic body 260 are magnetically attracted to each other, so that at least one printed circuit board 300 can be clamped to the first carrier plate 100 and Between the second carrier plates 200. At this time, the printed circuit board 300 is interposed between the first magnetic body 160 and the second magnetic body 260. So when printing When the brush circuit board 300 is processed (e.g., by a tin furnace) with the circuit board fixture 10, the printed circuit board 300 cannot be warped, displaced, or deformed between the first carrier board 100 and the second carrier board 200. Generally, the first magnetic body 160 and the second magnetic body 260 are respectively adhered to the first hole 140 and the second hole 240 through water glue (not shown), however, the invention is not limited thereto. The first magnetic body 160 and the second magnetic body 260 may also adhere to the first hole 140 and the second hole 240 without passing through the water glue, and only rely on the frictional force of the magnetic body in the hole.

In the present embodiment, more specifically, as shown in FIGS. 2 and 3, the first carrier plate 100 has a plate shape and has two opposing first faces 110 and second faces 120. The first hole 140 is located on the first face 110 of the first carrier plate 100. The second carrier plate 200 has a plate shape and has two opposite third faces 210 and fourth faces 220. The second hole 240 is located on the third surface 210 of the second carrier 200. As such, when the first carrier 100 and the second carrier 200 are in contact with each other, the first surface 110 of the first carrier 100 and the third surface 210 of the second carrier 200 respectively touch the printed circuit board 300.

In the present embodiment, as shown in FIGS. 2 and 3 , the first carrier plate 100 further has a plurality of first openings 130 . The first opening 130 penetrates the first surface 110 and the second surface 120 of the first carrier 100 and is spaced apart according to an array. Likewise, the second carrier plate 200 further has a plurality of second openings 230. The second opening 230 extends through the third surface 210 and the fourth surface 220 of the second carrier 200 and is spaced apart according to an array. As such, when the first carrier board 100 and the second carrier board 200 are used to clamp the printed circuit board 300, each of the first openings 130 is aligned with the corresponding second opening 230. And the first opening 130 exposes a portion of the printed circuit board 300, for example, a circuit on a portion of one side of the printed circuit board 300, and the second opening 230 exposes a portion of the printed circuit board 300, for example, the printed circuit board 300 The circuit on a part of the surface.

Thus, when the printed circuit board 300 is processed along with the circuit board fixture 10 (for example, through a tin furnace), the electronic component can be connected to the printed circuit from a circuit in which the first opening 130 and/or the second opening 230 are exposed. On the board 300. In the present embodiment, the first opening 130 and the second opening 230 are both rectangular, however, the present invention is not limited to this shape.

In addition, as shown in FIG. 3, the first carrier plate 100 further has at least one first fine hole 150. The first fine hole 150 is located on the second surface 120 of the first carrier plate 100 and turns on the first hole 140. The diameter of the first fine hole 150 is smaller than the diameter of the first hole 140. The second carrier 200 further has at least one second hole 250. The second hole 250 is located on the opposite side of the second surface 220 of the second carrier 200 and is connected to the second slot 240. The diameter of the second pore 250 is smaller than the diameter of the second orifice 240. In this embodiment, since the first magnetic body 160 or/and the second magnetic body 260 are in the shape of a pie, the shape of the first hole 140 or/and the second hole 240 is different from the first magnetic body 160 or/and the second The shape of the magnetic body 260 is substantially matched. As such, when the first magnetic body 160 or/and the second magnetic body 260 are loaded into the first hole 140 or/and the second hole 240, the gas in the first hole 140 or/and the second hole 240 may be Exclusion from the first pores 150 or/and the second pores 250. In addition, when the first magnetic body 160 or/and the second magnetic body 260 need to be replaced due to demagnetization or other factors, in the consideration of removing the first magnetic body 160 or/and the second magnetic body 260, a needle is used. (eg top a needle (not shown) extends into the first hole 150 or/and the second hole 250, and the first magnetic body 160 or/and the second magnetic body 260 may be respectively from the first hole 140 or/and the second The slot 240 is disengaged from the first carrier plate 100 or/and the second carrier plate 200.

However, the present invention is not limited thereto. In other embodiments, the first fine holes 150 or/and the second fine holes 250 may also be omitted, so that the first holes 140 or/and the second holes 240 are changed to blind holes. Further, the present invention is not limited to the shape of the first hole 140 or/and the second hole 240 and the first magnetic body 160 or/and the second magnetic body 260.

Since the clamping force of the circuit board fixture 10 is too large, which may cause damage to the electronic circuit design on the printed circuit board 300, the inventors have found that each of the first magnetic body 160 and the second magnetic body 260 is magnetically attracted to each other. If the magnetic attraction generated is too large, the corresponding area of the printed circuit board 300 will be pressed or even damaged, resulting in damage to the electronic circuit design on the printed circuit board 300. Therefore, after many experiments, the inventors finally found out that once the magnetic attraction strength of the magnetic attraction between the first magnetic body 160 and the second magnetic body 260 is in the range of 168 Gauss to 550 Gauss, the printed circuit board 300 can be stabilized. The ground is sandwiched between the first carrier plate 100 and the second carrier plate 200, but the printed circuit board 300 is not damaged due to excessive magnetic attraction.

In practice, the inventors control the magnetic interaction between the first magnetic body 160 and the second magnetic body 260 by adjusting the thickness of the magnetic body and/or the minimum linear distance from the bottom of the hole to the printed circuit board 300 (ie, the depth of the groove). Magnetic attraction strength. The minimum linear distance from the bottom of the slot to the printed circuit board 300 (ie, the depth of the slot) and the magnetic attraction of the first magnetic body 160 and the second magnetic body 260 The force strength is inversely proportional. The thickness of the first magnetic body 160 and the second magnetic body 260 is substantially proportional to the magnetic attraction strength of the magnetic attraction between the first magnetic body 160 and the second magnetic body 260.

Specifically, as shown in FIG. 3, the first hole 140 has a first depth A1. The first magnetic body 160 has a first thickness T1 that is smaller than the first depth A1. The second hole 240 has a second depth A2. The second magnetic body 260 has a second thickness T2 that is smaller than the second depth A2.

Table 1 below shows various magnetic attraction strengths obtained by testing the Gaussmeter for the depth of the first hole 140 from 2.1 mm to 2.8 mm and the thickness of the first magnetic body 160 to 1.8 mm to 2.0 mm. As can be seen from Table 1, the first depth A1 is in the range formed by 2.1 mm to 2.8 mm, respectively. The first thickness T1 is in the range of 1.8 mm to 2.0 mm, respectively.

As can be seen from Table 1, for example, when the first thickness T1 is 2.0 mm, and the first depth A1 is 2.5 mm, the magnetic attraction strength is 250 Gauss, or the magnetic attraction strength is 250 Gauss ± 10 (ie, 240 Gauss ~ 260 Gauss) in the range formed. For another example, when the first thickness T1 is 1.8 mm and the first depth A1 is 2.35 mm, the magnetic attraction strength is 230 Gauss, or the magnetic attraction strength is 230 Gauss ± 10 (ie 220 Gauss ~ 240 Gauss) is formed in the range.

In this embodiment, the first hole 140 and the second hole 240 have the same size specifications, and the second thickness T2 and the second depth A2 are similar to each other. The data of the thickness T1 and the first depth A1, so after referring to the data of the first thickness T1 and the first depth A1 of Table 1, the magnetic attraction generated by the mutual magnetic attraction of the first magnetic body 160 and the second magnetic body 260 The intensity is substantially between 1 and 2 times the magnetic attraction strength of the first magnetic body 160. Therefore, the magnetic attraction generated by the magnetic attraction between the first magnetic body 160 and the second magnetic body 260 can be derived from Table 1. The highest value of intensity is roughly regarded as 275 Gauss ~ 550 (275 * 2), the lowest value is roughly regarded as 168 Gauss ~ 336 Gauss (168 * 2), that is, its maximum range can be roughly regarded as 168 Gauss ~ 550 Gauss.

In addition, when the thickness of the printed circuit board 300 is small enough to be temporarily ignored, and the types of the first magnetic body 160 and the second magnetic body 260 are identical, the top surfaces of the first magnetic body 160 and the second magnetic body 260 facing each other are mutually The minimum linear distance between the spaces may determine the first magnetic body 160 and the second magnetic body 260 The magnetic attraction strength generated by mutual magnetic attraction. For example, a minimum linear distance of the first magnetic body 160 facing one surface of the second magnetic body 260 to a surface of the first carrier plate 100 facing the second carrier plate 200 is in a range of 0.3 mm to 0.7 mm, in other words, The difference between the first depth A1 and the first thickness T1 is in a range of 0.3 mm to 0.7 mm. Thus, the range of the output magnetic strength of the first magnetic body 160 is substantially between 200 Gauss and 260 Gauss. .

Since the first hole 140 and the second hole 240 have the same size specifications, and the second thickness T2 approximates the data of the first thickness T1, the first depth A1 of the first carrier 100 and the first thickness T1 are The phase difference is between 0.3 mm and 0.7 mm, and the minimum linear distance between the top surfaces of the first magnetic body 160 and the second magnetic body 260 facing each other can be derived (that is, the first depth A1 - first The thickness T1 + the second depth A2 - the second thickness T2) is in a range formed by 0.6 mm to 1.4 mm. Since the range of the magnetic attraction strength of the first magnetic body 160 is substantially between 200 gauss and 260 gauss, the maximum value of the magnetic attraction strength generated by the magnetic interaction between the first magnetic body 160 and the second magnetic body 260 is substantially the same. Considered to be between 260 Gauss ~ 520 Gauss (260 * 2), the lowest value is roughly between 200 Gauss ~ 400 Gauss (200 * 2), that is, its maximum range can be roughly regarded as 200 Gauss ~ 520 Gauss.

Since the circuit board fixture 10 of FIG. 1 is processed, for example, by a tin furnace, the water gel may be affected by high temperature and cannot effectively grasp the first magnetic body 160 in the first hole 140 and the second hole 240. The second magnetic body 260. In this regard, as shown in FIG. 4, FIG. 4 illustrates another embodiment of the present invention. A cross-sectional view of the circuit board jig 11 of the mode has the same cross-sectional position as that of FIG. The circuit board jig 11 of the present embodiment is substantially the same as the circuit board jig 10 of the first embodiment. One of the differences is that the first magnetic body 160 is hard pressed into the first hole by riveting and die casting. In the groove 140, the first magnetic body 160 is fitted to the first hole 140 in a mating manner, so that the first hole 140 cannot be separated from the first hole 140. More specifically, after the first magnetic body 160 is hard pressed into the first hole 140, the inner wall of the first hole 140 is pressed against the side of the first magnetic body 160 exposing the notch 141 of the first hole 140, That is, the minimum width W2 of the notch 141 of the first hole 140 is smaller than the maximum width W1 of the first magnetic body 160. Thus, regardless of whether the first magnetic body 160 is fixed in the first hole 140 by water glue, the first magnetic body 160 is not detached from the notch 141 by the magnetic mutual attraction. Similarly, the second magnetic body is also hard pressed into the second hole by means of riveting and die casting. Please refer to the other embodiment described above, and no further details are provided herein.

It should be understood that the present embodiment is intended to illustrate the number of holes and magnetic bodies, which may be changed according to the clamping force required to clamp the printed circuit board during the process, that is, the first magnetic body and the second magnetic body. The number is less than or equal to the number of the first hole and the second hole respectively. However, the present invention does not limit the number of the first hole and the second hole to be the same as or different from the number of the first magnetic body and the second magnetic body. . Further, the above-mentioned magnetic body, such as a magnet, is a permanent super-magnetic substance, and may be made of barium ferrite, barium ferrite, neodymium iron boron, aluminum nickel cobalt, and other materials which can be permanently magnetized. However, the invention is not limited to the kind or material of the magnetic body. Furthermore, the material of the first carrier plate and the second carrier plate is aluminum, and the expansion coefficient of the aluminum and the printed circuit board is similar, More effective in solving the problem of printed circuit board deformation. It should be noted that the materials of the first carrier board and the second carrier board listed above are merely exemplified, and are not intended to limit the present invention. Those having ordinary knowledge in the technical field of the present invention should select an appropriate material according to actual needs. .

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

10‧‧‧Circuit fixtures

100‧‧‧First carrier board

140‧‧‧First slot

150‧‧‧ first pore

160‧‧‧First magnetic body

200‧‧‧Second carrier board

240‧‧‧Second hole

250‧‧‧Second pores

260‧‧‧Second magnetic body

300‧‧‧Printed circuit board

A1‧‧‧first depth

A2‧‧‧second depth

T1‧‧‧first thickness

T2‧‧‧second thickness

Claims (14)

A circuit board fixture comprising: a first carrier plate having at least one first slot; a second carrier having at least one second slot; at least one first magnetic body disposed in the first slot And the at least one second magnetic body is disposed in the second hole, wherein when the first carrier and the second carrier are covered with each other, the first magnetic body and the second magnetic body are mutually Magnetizing to generate a magnetic attraction strength such that a printed circuit board can be sandwiched between the first carrier plate and the second carrier plate, wherein the printed circuit board is interposed between the first magnetic body and the second magnetic body Between the bodies, and the magnetic attraction strength is between 168 Gauss and 550 Gauss. The circuit board fixture of claim 1, wherein the first carrier has two opposite first and second faces, the first slot is located on the first side of the first carrier, the second The carrier plate has two opposite third and fourth faces, and the second hole is located on the third face of the second carrier, wherein when the first carrier and the second carrier are covered with each other, The first side of the first carrier board and the third side of the second carrier board respectively touch the printed circuit board. The circuit board fixture of claim 2, wherein the first carrier further has at least one first hole, the first hole is located on the second side of the first carrier, and the first is turned on a hole groove, wherein the first hole has a small diameter The diameter of the first hole. The circuit board fixture of claim 2, wherein the second carrier further has at least one second hole, the second hole is located on the second carrier opposite the fourth surface, and the second is turned on The hole groove, wherein the diameter of the second hole is smaller than the diameter of the second hole. The circuit board fixture of claim 2, wherein the first carrier plate further has at least one first opening, the first opening penetrating the first side and the second side of the first carrier board, wherein When the printed circuit board is sandwiched between the first carrier and the second carrier, the first opening exposes a portion of the printed circuit board. The circuit board fixture of claim 2, wherein the second carrier plate further has at least one second opening, the second opening extending through the third surface and the fourth surface of the second carrier board, wherein When the printed circuit board is sandwiched between the first carrier and the second carrier, the second opening exposes a portion of the printed circuit board. The circuit board fixture of claim 1, wherein the first hole has a first depth, the second hole has a second depth, and the first depth and the second depth are respectively 2.1 mm. Within 2.8 mm of the range formed. The circuit board fixture of claim 7, wherein the first magnetic body has a first thickness smaller than the first depth, and the second magnetic body has a second thickness smaller than the second depth, wherein the first A thickness and the second thickness are respectively in the range of 1.8 mm to 2.0 mm. The circuit board fixture of claim 1, wherein the first hole has a first depth, the first magnetic body has a first thickness smaller than the first depth, wherein the first depth and the first The difference in thickness is in the range of 0.3 mm to 0.7 mm, and the magnetic attraction force generated by the first magnetic body ranges from 200 gauss to 260 gauss. The circuit board fixture of claim 1, wherein a minimum linear distance between the top surfaces of the first magnetic body and the second magnetic body facing each other is in a range of 0.6 mm to 1.4 mm. The magnetic attraction force generated by the first magnetic body ranges from 200 Gauss to 520 Gauss. The circuit board fixture of claim 1, wherein the first magnetic body is matingly fitted into the first hole by means of riveting and die casting. The circuit board fixture of claim 11, wherein the inner wall of the first hole is pressed against a side of the first magnetic body exposing a notch of the first hole, wherein the first hole is A minimum diameter of the slot is less than a maximum width of the first magnetic body. The circuit board fixture of claim 1, wherein the second magnetic body is matingly fitted into the second hole by means of riveting and die casting. The circuit board fixture of claim 13, wherein the inner wall of the second hole is pressed against a side of the second magnetic body that exposes a notch of the second hole, wherein the second hole A minimum diameter of the notch is less than a maximum width of the second magnetic body.