JP2002009417A - Substrate mount component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable automatic mounting of a component in which a screw insertion hole is formed, by using an automated mounting machine, prevent deterioration of mounting efficiency, and realize compact formation. SOLUTION: A metal foil 20 in which screw engaging segments 23 are stretched inward and reduce the aperture area of the screw insertion hole 11 in order to enable suction with a suction nozzle of the automated mounting machine is fixed on the upper part of a base part 10. When a screw is inserted, the screw engaging segments 23 of the metal foil 20 are deformed, and the screw is inserted. The tips 23a of the deformed screw engaging segments 23 engage with a thread ridge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board-mounted component which is surface-mounted on a printed wiring board and into which screws are inserted to fasten other members in the mounted state.

[0002]

2. Description of the Related Art Heretofore, there has been known a board-mounted component of a type which is surface-mounted on a printed wiring board and into which screws for fastening other members can be inserted. For example, a so-called lug terminal for establishing electrical continuity with a spacer or a housing mounted on a substrate corresponds to this. For example, the board mounting spacer is soldered to a pattern of a printed wiring board with its lower surface serving as a bonding surface. A screw hole is formed in the upper surface facing the lower surface, and another member such as a printed wiring board is fixed to the upper surface with a screw.

[0003]

In the above-described board-mounted component having the screw insertion hole formed therein, the screw hole is formed on the upper surface facing the joint surface to be soldered to the printed wiring board. As it is, suction by an automatic mounting machine using a suction nozzle cannot be performed.

Conventionally, the following method has been used. There has been a method of mounting a cap or a polyimide film so as to cover the opening of the screw hole. However, in this case, it is necessary to remove these members prior to insertion of the screw, which is troublesome and may result in forgetting to remove. As a result, the efficiency of the mounting operation is reduced.

There has also been a method of providing a suction surface in a portion different from the screw hole portion. However, in this case, it is not possible to reduce the size of the components, and there remains a problem, especially when considering adoption in recent small electric devices. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a compact board-mounted component which enables automatic mounting by an automatic mounting machine and does not cause a reduction in mounting work efficiency. And

[0006]

Means for Solving the Problems and Effects of the Invention The board mounted component according to the first aspect of the present invention, which has been made to achieve the above object, is mounted on a printed wiring board by soldering. In the mounted state, a screw for fastening and fixing another member is inserted.

In the present invention, in particular, the board-mounted component has a base and a metal foil fixed to the base. The base has a joining surface below it, which is to be soldered to the printed wiring board. Further, a screw insertion hole for passing a screw is formed in the base. It is conceivable that the screw insertion hole is a hole having a slightly larger diameter than the screw, for simply passing the screw. Further, a so-called screw hole into which a screw thread is formed and a screw is screwed may be used.

On the other hand, the metal foil is fixed above the base, that is, on the opposite side of the bonding surface below. Then, upon insertion of the screw, the screw is deformed and passed through. In addition, this metal foil covers the screw insertion hole so as to reduce the opening area of the screw insertion hole in order to enable suction by an automatic mounting machine before inserting the screw.

That is, in the present invention, a metal foil that covers the screw insertion hole is used so as to reduce the opening area of the screw insertion hole.
At the opening of the screw insertion hole, suction by the automatic mounting machine was made possible. That is, automatic mounting by an automatic mounting machine can be performed. When the screw is inserted, the metal foil is deformed and the screw is passed. Therefore, unlike the related art, there is no need to remove the cap or the film after mounting. In addition, since the screw insertion hole is generally formed in the center portion of the component, if the suction is performed at the opening portion, the suction can be reliably performed in a well-balanced manner. It doesn't grow.

Further, the thread portion of the screw is engaged with the deformed metal foil. Therefore, if the thickness of the metal foil is made appropriate, the screws can be temporarily fixed in a stage before the screws are rotated and fastened and fixed. Further, even after fastening and fixing, the backlash of the screws can be prevented.

The metal foil may be any metal foil that reduces the opening area of the screw insertion hole to the extent that it can be sucked by an automatic mounting machine. The screw insertion hole may be completely closed, but in this case, although the suction efficiency is improved, easy deformation at the time of screw insertion cannot be expected.

Therefore, it is conceivable to provide a hole of a predetermined shape in the metal foil to make it easy to pass a screw. The predetermined shape may be a cross shape, a triangular shape, a square shape, or the like, but may be easily deformed by abutment of a screw, and the shape is not particularly limited. However, it is desirable that the shape be such that it engages with the screw thread with good balance after deformation. Specifically, it is conceivable that the shape is point-symmetric with respect to the center of the opening of the screw insertion hole. If the threads are engaged with the threads in a well-balanced manner, the screws can be securely temporarily fixed, and rattling of the screws can be further prevented.

In terms of the size of the hole provided in the metal foil, generally, the larger the hole in the metal foil, the lower the suction efficiency, and conversely, the screw can be inserted with a relatively small force.
However, the suction efficiency also changes depending on the weight of the component, the diameter of the suction port of the suction nozzle, and the suction force. Further, since the metal foil is easily deformed when it becomes thin, the screw can be inserted with a relatively small force. Therefore, the size of the hole provided in the metal foil may be determined in consideration of the weight of the entire component, the diameter of the suction nozzle, the suction power, the thickness of the metal foil, and the like.

[0014] From a similar viewpoint, a metal foil may be provided with a slit having a predetermined shape for facilitating the passage of a screw. The slit referred to here is a linear groove formed at least on one surface of the metal foil and cut so deeply as not to penetrate. If such a slit is provided, the screw insertion hole is completely closed, so that the suction efficiency is improved, and when the screw abuts, this slit portion is broken and deformed in accordance with the slit. Easy deformation of time is also realized.

It is conceivable that such a metal foil is fixed to the base, for example, as described in claim 4. That is, a fixing hole is provided in the metal foil, and a projection corresponding to the fixing hole is provided on the base. The fixing hole is, for example, 3
It is conceivable to provide a plurality of holes of about 0 microns. The projection has a slightly smaller diameter than the fixing hole. Then, the tip of the projection inserted into the fixing hole and penetrating the metal foil is crushed to fix the metal foil to the base. In this way, the metal foil can be easily fixed to the base.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 shows a "board mounted component" of a first embodiment.
FIG. 1 is a schematic perspective view showing an appearance of a lug terminal 1 as an example.

The lug terminal 1 has a base 10 and a metal foil 20. The base 10 is a metal member that is thicker than the metal foil 20, and has a circular plate-shaped ring portion 12 provided with a screw insertion hole 11 in the center portion, and a joining piece 13 protruding from the ring portion 12. And The diameter of the screw insertion hole 11 is slightly larger than the diameter of the screw. The joining pieces 13 have a rectangular shape, and four projecting pieces are provided at intervals of 90 degrees from the outer periphery of the ring portion 12 toward the side surface. The lower surface of the joint piece 13 is a joint surface 13a to be soldered to the ground pattern of the printed wiring board. In consideration of the soldering performance, conductivity, strength, and the like on the joint surface 13a, such a base 10 may be plated with iron or made of copper.

On the other hand, the metal foil 20 is a so-called “foil” which is thinner than the base 10. The metal foil 20 may be, for example, a gold foil, a silver foil, a copper foil, a stainless steel foil, an aluminum foil, a beryllium copper foil, or the like. Gold foil is suitable in consideration of conductivity and the like, but may be appropriately selected in consideration of cost and the like.

The metal foil 20 is formed by providing a hole 21 having a predetermined shape in a circular foil having a smaller diameter than the outer diameter of the ring portion 12 and a larger diameter than the inner diameter. The hole 21 includes a circular hole in the center portion smaller than the diameter of the screw to be inserted, and six holes cut radially outward from the circular hole. Due to the holes 21, the metal foil 20 has a shape having a circular portion 22 that is just arranged on the upper surface of the ring portion 12 and six screw engaging pieces 23 extending inward from the circular portion 22. .

A fixing hole 24 of about 30 microns is provided outside the central portion of each screw engaging piece 23. The metal foil 20 is placed so that a corresponding projection (not shown) on the upper surface of the ring portion 12 passes through the fixing hole 24, and the tip of the projection is crushed and fixed to the base 10.

By fixing the metal foil 20 on the upper surface of the base 10 in this manner, the lug terminal 1 can
The screw engaging piece 23 reduces the opening area of the screw insertion hole 11 of the base 10 so that the upper surface of the lug terminal 1 can be sucked by the automatic mounting machine.

Therefore, the lug terminal 1 is mounted on a predetermined position of the printed wiring board by adsorbing the upper surface of the metal foil 20 by the suction nozzle of the automatic mounting machine. It is mounted by soldering on the surface 13a. Specifically, cream solder is printed and supplied on the ground pattern, and is soldered by reflow soldering.

FIG. 2 shows a state of being mounted on a printed wiring board. FIG. 2 is an explanatory diagram showing a schematic cross section on a vertical plane passing through a one-dot chain line D1 in FIG. As shown in FIG. 2, in the mounted state, a screw is further inserted from below the printed wiring board, and tightened and fixed to a boss of a metal housing having a screw hole. When the screw is inserted, the screw engaging piece 23 is deformed so as to be bent upward as shown by a two-dot chain line in FIG. 2, and the screw is passed through, and the tip 23a of the deformed screw engaging piece 23 engages with the thread portion. I do. The metal foil 20 of the lug terminal 1 is pressed into contact with the boss of the housing by the fastening with such screws, and the ground pattern of the printed wiring board is grounded to the housing.

As described above, in the lug terminal 1 of the first embodiment, since the metal foil 20 for reducing the opening area of the screw insertion hole 11 provided in the base 10 is used, automatic mounting by an automatic mounting machine can be performed. When the screw is inserted, the screw engaging piece 23 of the metal foil 20 is deformed and the screw passes. Therefore, unlike the related art, there is no need to remove the cap or the film after mounting. Further, since the suction is performed on the upper surface portion of the lug terminal 1, the suction can be balanced and surely performed, and the components do not become large as compared with a configuration in which the suction surface is separately provided.

Further, the tip 2 of the deformed screw engaging piece 23
3a engages the thread. Therefore, it is possible to temporarily fix the screw in a stage before the screw is rotated and fastened and fixed. Further, even after fastening and fixing, the backlash of the screws can be prevented. In the lug terminal 1, the metal foil 20
Since the metal foil 20 is easily deformed when a screw is inserted by providing a hole 21 having a predetermined shape, the screw can be inserted with a relatively small force, in addition to enabling suction by an automatic mounting machine.

Furthermore, in the lug terminal 1, the metal foil 20
Was provided with a fixing hole 24, the projection on the upper surface of the ring portion 12 of the base 10 was penetrated through the metal foil 20, and the tip was crushed and fixed. Therefore, the formation of the lug terminal 1 is simplified in terms of fixing the metal foil 20.

[Second Embodiment] FIG. 3 is a schematic perspective view showing the appearance of a board-mounted spacer 3 as a "board-mounted component" in a second embodiment. The board mounting spacer 3 includes a base 30.
And a metal foil 40.

The base 30 is a metal member that is thicker than the metal foil 40, and is a cylindrical member having a screw insertion hole 31 provided at the center. The lower surface of the base 30 is a joining surface 30a to be soldered to the ground pattern of the printed wiring board. Such a base 30 is similar to the above-described embodiment.
In consideration of soldering, conductivity, strength, and the like at the joint surface 30a, it is conceivable to use iron as plating or copper. In addition, a triangular cutout 34 is provided below the base 30 of the board mounting spacer 3 of this embodiment in order to reduce the weight and maintain the strength.

On the other hand, the material and shape of the metal foil 40 are the same as those in the above embodiment. That is, the material of the metal foil 40 may be gold, silver, copper, stainless steel, aluminum, beryllium copper, or the like. The metal foil 40 is provided with a hole 41 of a predetermined shape, and the hole 41 allows the metal foil 40 to have a circular portion 42 just disposed on the upper surface of the cylindrical base 30 and an inward direction from the circular portion 42. Extended 6
And two screw engagement pieces 43.

A fixing hole 44 of about 30 μm is provided outside the central portion of each screw engagement piece 43. The metal foil 40 is mounted on the base 30 so that a corresponding projection (not shown) on the upper surface of the base 30 penetrates the fixing hole 44, and the tip of the projection is crushed and fixed to the base 30.

By fixing the metal foil 40 to the upper surface of the base 30 in this manner, in the board mounting spacer 3, the screw engagement piece 43 of the metal foil 40 reduces the opening area of the screw insertion hole 31 of the base 30. And the board mounting spacer 3
The suction by the automatic mounting machine on the upper surface of the was enabled.

Accordingly, the substrate mounting spacer 3 is mounted on a predetermined position of a printed wiring board such as a motherboard by adsorbing the upper surface of the metal foil 40 to the suction nozzle of the automatic mounting machine.
The printed circuit board is mounted on the ground pattern of the printed wiring board by soldering at the joint surface 30a. FIG. 4 shows a state of being mounted on a printed wiring board. FIG. 4 is an explanatory diagram showing a schematic cross section in a vertical plane passing through a one-dot chain line D2 in FIG. A screw thread is cut inside the base 30 and a screw is screwed therein. However, the inner diameter of the upper part is wider than the diameter of the screw. Then, a plate-like member such as a printed wiring board is tightened and fixed together with screws from above in the mounted state. At the time of screw insertion, as shown by a two-dot chain line in FIG.
Is deformed to allow the screw to pass therethrough, and the tip end 43a of the deformed screw engaging piece 43 is engaged with the thread portion. The reason why the inner diameter of the base 30 is increased in the upper portion as described above is to facilitate the deformation of the screw engagement piece 43. By tightening and fixing with such screws, a space at the height of the substrate mounting spacer 3 is secured between the printed wiring board and the plate member.

The same effect as in the first embodiment can be obtained in the substrate mounting spacer 3 of the second embodiment as described above. That is, since the metal foil 40 for reducing the opening area of the screw insertion hole 31 is used, automatic mounting by an automatic mounting machine can be performed. When the screw is inserted, the screw engaging piece 43 of the metal foil 40 is deformed to allow the screw to pass. Therefore, unlike the related art, there is no need to remove the cap or the film after mounting. In addition, since the suction is performed on the upper surface portion of the board mounting spacer 3, a stable and reliable suction can be achieved, and the component does not become large as compared with a configuration in which the suction surface is separately provided.

Further, the tip 4 of the deformed screw engagement piece 43
3a engages the thread. Therefore, the screw can be temporarily fixed before the screw is rotated and fastened and fixed. Further, even after fastening and fixing, the backlash of the screws can be prevented. Also, in the board mounting spacer 3, similarly to the above-described embodiment, the metal foil 40 is provided with the hole 41 of a predetermined shape so that the metal foil 40 is easily deformed at the time of screw insertion, so that the suction by the automatic mounting machine is prevented. Not only is it possible, but the screw can be inserted with relatively little force.

Further, a fixing hole 44 was provided in the metal foil 40, a protrusion on the upper surface of the base 30 was penetrated through the metal foil 40, and the tip was crushed and fixed. Therefore, the formation of the substrate mounting spacer 3 is simplified in terms of fixing the metal foil 40. [Others] As described above, the present invention is not limited to such embodiments at all, and can be implemented in various forms without departing from the gist of the present invention.

For example, in the above embodiment, the metal foils 20 and 40
Are provided with holes 21 and 41 of a predetermined shape to facilitate deformation at the time of screw insertion. On the other hand, the metal foils 20 and 40 may be provided with slits. The slit referred to here is at least the metal foil 2
It means a linear groove formed on one surface of 0, 40 and deeply cut so as not to penetrate. Such a slit can be formed in units of microns by laser processing.
If the slit is provided, the openings of the screw insertion holes 11 and 31 are completely closed, so that the suction efficiency is improved, and when the screw comes into contact, the slit portion is broken and deformed according to the shape of the slit. Therefore, easy deformation at the time of screw insertion is also realized.

Further, the metal foils 20 and 4 in the above embodiment are used.
The shape of the zero holes 21 and 41 and the shape of the slit are not particularly limited. This is because it is only necessary to deform easily by the contact of the screw. However, it is desirable that the shape be such that it engages with the screw thread with good balance after deformation.

For example, as shown in FIGS. 5A to 5C, a cross-shaped hole 51 is formed, a triangular hole 52 is formed, or a square hole 53 is formed. It is conceivable that. FIG. 5 (b) and (c)
In the case shown in (1), the ends of the holes 52 and 53 break when the screws are inserted. Also, as shown in FIGS. 5D and 5E, a cross-shaped slit 61 or a radial slit 62 may be formed.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a lug terminal of a first embodiment.

FIG. 2 is an explanatory diagram showing a schematic cross section of a use state of a lug terminal.

FIG. 3 is a schematic perspective view showing a substrate mounting spacer of a second embodiment.

FIG. 4 is an explanatory diagram showing a schematic cross section of a usage state of the substrate mounting spacer.

FIG. 5 is an explanatory view illustrating holes / slits provided in a metal foil;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lug terminal 3 ... Board mounting spacer 10, 30 ... Base 11, 31 ... Screw insertion hole 12 ... Ring part 13 ... Joint piece 13a, 30a ... Joint surface 34 ... Notch 20, 40 ... Metal foil 21, 41 ... Hole 22, 42: Circular part 23, 43: Screw joint piece 23a, 43a: Tip 24, 44 ... Fixing hole 51, 52, 53 ... Hole 61, 62 ... Slit

Claims (4)

[Claims] 1. A board mounted component which is soldered and mounted on a printed wiring board and in which a screw for tightening and fixing another member is inserted in the mounted state, the bonding surface to be soldered downward. A base having a screw insertion hole for passing the screw formed therein, and a metal foil fixed above the base, deformed upon insertion of the screw and passing the screw, and before insertion of the screw. And a metal foil covering the screw insertion hole so as to reduce the opening area of the screw insertion hole in order to enable suction by an automatic mounting machine. 2. The board-mounted component according to claim 1, wherein the metal foil is provided with a hole having a predetermined shape for facilitating the passage of the screw. 3. The board-mounted component according to claim 1, wherein the metal foil is provided with a slit of a predetermined shape for facilitating the passage of the screw. 4. The board-mounted component according to claim 1, wherein a fixing hole is provided in the metal foil, and a protrusion corresponding to the fixing hole is provided on the base, and the metal foil is inserted into the fixing hole. A board-mounted component, wherein a tip portion of the projection penetrating the metal foil is crushed to fix the metal foil to the base.