JP2012138606A - Manufacturing method and holding method of mount substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a holding method of a mount substrate which prevents damage even through mounted components interfere with support pins, easily removes unnecessary support parts, and has high followability for model change.SOLUTION: One surface of a substrate, on which electronic components are mounted, is supported from below by support members, and the substrate is held so that a flat surface is maintained. Then, electronic components are mounted on the other surface of the substrate. Multiple support pins, each of which has a tip formed into a spherical shape and is made of a foamed elastic material, are provided to hold the substrate. The support pins are elastically deformed to reduce the interference with the electronic components on the mount substrate.

Description

  The present invention relates to a surface mounting apparatus for mounting electronic components or the like on a substrate, a method for manufacturing a mounting substrate on which electronic components or the like are mounted, and a method for holding a mounting substrate for holding the substrate when manufacturing the mounting substrate. About.

  In general, surface mounting for mounting electronic components on a substrate is performed by, for example, transporting a mounting board one by one to a solder printer by a substrate supply device before the process by this apparatus for performing surface mounting. The solder is printed on the land of the mounting board. Then, after inspection with a solder printing state inspection machine that inspects the printing state of the solder as necessary, it is carried into a mounting machine (generally, there are a high-speed mounting machine and a general-purpose machine) as the apparatus.

  The mounting board carried into the mounting machine is positioned by the positioning pins that enter the positioning holes of the board in a state where both ends of the board are sandwiched on the mounting stage (XY table or the like) in the mounting machine. Positioned. After that, the block where pins etc. that correct the bending and warping of the board are arranged rises from the lower side of the board, and the board is supported from the lower side by the pins so as to keep the plane so as not to bend or warp. Hold. In this state, electronic components are mounted on the upper surface of the substrate from above, and when a predetermined mounting sequence is completed, the substrate is carried out toward the next mounting machine or the like.

  And the board | substrate which finished the mounting | wearing by a predetermined mounting machine is carried in to a reflow furnace after that, and when soldering of the electronic component there is completed, it will be transferred to an inspection machine and will be inspected. The inspection machine determines the position shift, missing item, standing, etc. of the parts by image processing using a camera, laser, etc., classifies the non-defective product and the defective product, displays the defective part, and then carries it out. This completes the surface mounting. In addition, when applying an adhesive, it is only different from the case where solder is applied in that a coating machine is used instead of the above-described printing machine and a curing furnace is used instead of a reflow furnace, and printing is otherwise performed. This is substantially the same as the case of.

  The mounting height of the electronic components to be mounted on the board is determined in advance by the thickness of the electronic components to be mounted, the height of the component pickup section, etc., and the surface of the board is properly positioned at the set height. If it is, it will be installed properly. However, the substrate warps downward during mounting. In that case, the electronic component does not reach the surface to which the solder (or adhesive) is applied, so that the component to be mounted may be in a state of being released into the air. There is a problem that it cannot be secured on the street.

  In addition, when inspecting a board on which electronic components are mounted using an inspection machine, if the board bends downward, the focus height of the camera of the inspection machine changes, so the image data is not accurately captured and an erroneous determination is made. There is a risk of bringing about. Therefore, when applying solder or an adhesive to a mounting substrate, mounting an electronic component on the mounting substrate to which the solder or adhesive is applied, and then inspecting the substrate on which the electronic component is mounted Therefore, it is necessary to support the substrate so as to keep a flat state from the lower side.

  As a first conventional example of supporting a substrate, a plate a having a large number of holes b arranged in a lattice shape as shown in FIG. 2 (A) is prepared, and each hole b is shown in FIG. 2 (B). Some support pins c made of metal or resin as shown are inserted, and the substrate is supported from below by these many support pins c. In some cases, a pin having a relief structure in the vertical direction with a compression spring inside is used.

  As a second conventional example, as shown in FIG. 3A, the plate d is made of a magnetic material, or the magnetic material is built in the plate d, and as shown in FIG. There is a support pin f in which e is embedded, the support pin f is held upward on the plate d by magnetic force, and the substrate is supported by the support pin f.

  As a third conventional example, as shown in FIG. 4, a block g made of a metal such as aluminum or a resin having irregularities formed on the upper surface in accordance with the shape of the lower surface of the mounting substrate is used. There is one in which the substrate is supported by the surface on which the unevenness is formed.

  As a fourth conventional example, as shown in FIG. 5, a block-shaped foam mat having conductivity is prepared, and one surface thereof is cut in a lattice shape to a certain depth so that a plurality of protrusions h are staggered, for example. There is a plate i that is arranged and supports the substrate by the plurality of protrusions h.

  Patent Document 1 describes a printed circuit board support device that can reduce the labor and cost of replacing a backup pin. Further, Patent Document 2 proposes a backup plate that prevents the electronic component and the printed circuit board from being damaged in the automatic mounting for the printed circuit board, the mounting of the electronic component of the inspection apparatus, or the measurement operation.

JP-A-8-148899 JP-A-8-204398

  By the way, the conventional substrate support jigs described above have drawbacks. And the seriousness of the shortcomings is becoming impossible to ignore. This is because the progress of surface mounting technology is not known to stop, and the mounting density, heightening, and precision of mounting are progressing, and the mounting substrate tends to become thinner, This is because warping and distortion are likely to occur due to heat during the curing process. Accordingly, the importance of high flatness and stability of the mounting surface of the electronic component on the substrate during solder cream or adhesive application, electronic component mounting, and inspection is increasing.

  Therefore, the drawbacks of the conventional example will be specifically described. In the first conventional example, when the mounting component is arranged on the lower surface of the substrate (particularly, the preceding mounting surface of the double-sided mounting substrate), the arrangement of the mounting component is arranged. The position and the height of parts vary depending on the model and specifications and are various, and each support pin c is subject to the restriction of the mounting position that it can only be mounted in the holes b arranged in a grid, so that the substrate is supported well. There is a drawback in that the support pin c may not be arranged at a support position necessary for the operation.

  Further, since the supporting pin c is hard and does not have elasticity, there is a possibility that the mounting component may be damaged or missing when it interferes with the mounting component depending on its arrangement position. In addition, when setting the position at the time of setup change, it is necessary to move the support pin c in accordance with the substrate each time the setup is changed, and this movement takes time that cannot be ignored. It is a major factor that hinders the shortening of time, and is also unsuitable for multi-product production.

  In the second conventional example, since the support pin f is held in a plate d shape by a magnetic force, the degree of freedom in setting the position is higher than in the first conventional example, but the support pin f Depending on the arrangement position, there is a drawback that the pin f and the mounted component may interfere with each other, which may cause problems such as breakage and missing. Further, the problem at the time of position setting at the time of setup change, that is, the point that it is necessary to move the support pin f in accordance with the substrate each time is the same as in the first conventional example.

  In the third conventional example, it takes time and cost to manufacture the block g for supporting the substrate, and the versatility and the model change followability are low, and when manufactured, there is a tendency to use a dedicated jig for the model. There is a serious drawback that it is strong and unsuitable for the production of a small variety of products that will increase in number.

  The fourth conventional example is an improvement of the disadvantages of each of the conventional examples described above. By cutting one surface of the block-shaped foam mat according to the model of the substrate to be supported, the support part is optimally adapted to that model. It is easy to arrange, and even if it is disposable, it costs little. It can be said that it is excellent in that respect. However, there is a drawback in that cut waste and dust are generated at the time of cutting, the cut waste and dust remain, and when the substrate is supported, the cut waste and dust may adhere to the substrate. Further, since a plate having elasticity is used, there is a problem that the shape is difficult to stabilize and the yield is reduced.

  The present invention has been made to solve such problems, and when the mounting substrate is placed on the substrate support jig, there is no damage even if it interferes with the mounted components, and unnecessary support portions An object of the present invention is to provide a mounting substrate manufacturing method and a holding method that are easy to remove and have high followability to model changes.

  The method for manufacturing a mounting board according to the present invention includes a step of holding a board so that one side of the board on which an electronic component is mounted on one side is supported by a support member from the lower side to keep the plane, and the other side of the board Mounting the electronic component on the surface of the mounting board. Then, the step of holding the substrate is performed by elastically deforming the support pin at a location where the electronic component mounted on one surface of the mounting substrate interferes with a plurality of support pins made of a foamed elastic material having a spherical tip. And supporting the process. Note that the support pin preferably has conductivity.

  In the substrate holding method of the present invention, when holding the substrate so that one surface of the substrate on which the electronic component is mounted on one surface is supported from the lower side by the support member, the tip is held. A plurality of support pins made of a foamed elastic material having a spherical shape are used to elastically deform and hold the support pins at locations that interfere with electronic components mounted on one surface.

  According to the present invention, since the plate portion and the support pin are integrally formed by molding, there is no possibility of generating scraps and dust as in the case where the support pin is formed by cutting, and the substrate is contaminated. There is no fear. Furthermore, since the substrate support jig is formed by integral molding, it can be manufactured easily and without variation in shape and dimensions, and the manufacturing cost can be reduced.

  In addition, since a plurality of support pins having the same height are formed on one main surface of the plate portion, it is possible to support the substrate flatly from below with the plurality of support pins having the same height. it can. Since the forming material is made of a foamed elastic material, for example, when a double-sided mounting board is supported on its pre-production surface, even if the electronic component on that surface interferes with the support pin (impacts), The supporting pin is compressed by its own elasticity. Therefore, since the supporting pins can be elastically deformed, a substrate holding method that does not damage the interfering electronic components can be obtained.

  Further, since the plate portion and the support pins are integrally formed by molding, the substrate support jig is formed by molding, so that it can be easily manufactured and the manufacturing cost can be reduced.

(A)-(F) shows the 1st Example of the board | substrate support jig | tool relevant to the embodiment of this invention, (A) is a top view, (B) is a rear view, (C) is (D) is a left side view, (E) is a right side view, and (F) is a bottom view. (A), (B) shows a first conventional example, (A) is a perspective view of a substrate support jig, (B) is a perspective view showing a support pin. (A), (B) shows the 2nd prior art example, (A) is a perspective view of a substrate support jig, and (B) is a perspective view of a support pin. It is a perspective view which shows a 3rd prior art example. It is a perspective view which shows a 4th prior art example.

BEST MODE FOR CARRYING OUT THE INVENTION

  In the present invention, basically, a plate portion made of a foamed elastic material and a plurality of support pins having the same height and formed integrally on one main surface of the plate portion are integrally formed. As the foamed elastic material, it is preferable to use a material having a hardness that facilitates excision of the support pins. For example, when the interference of the support pins for the electronic components generated when the double-sided mounting board is supported on the preceding production surface is too strong, the support pins should be appropriately cut to avoid the interference. Because you can. An example of a foamed elastic material suitable for satisfying such conditions is urethane foam. This is because it is inexpensive and has good workability.

  Moreover, it is good to use what has electroconductivity as a foaming elastic material. The reason is that charging is caused by friction or the like when solder or adhesive is applied to a substrate, mounting of an electronic component, etc., and charging that may cause destruction of the electronic component due to discharge of the charging is prevented. Because it can. The elastic modulus and compressibility of foamed elastic materials such as urethane foam can be changed according to the degree of foaming. Therefore, the appropriate elastic modulus and compressibility of the substrate support can be selected according to the type and condition of the substrate to be supported. Tools may be provided. In practice, it is possible to change the elastic modulus and compression rate of the substrate support jig in lot units.

  Here, the tip of the support pin is preferably formed in a spherical shape. This is because when the support pins are in contact with the lower surface of the substrate, damage to the lower surface can be further reduced.

<Example>
Hereinafter, the present invention will be described in detail according to illustrated embodiments. 1A to 1F show a first example of a substrate support jig related to an embodiment of the present invention. FIG. 1A is a plan view, FIG. 1B is a rear view, and FIG. ) Is a front view, (D) is a left side view, (E) is a right side view, and (F) is a bottom view. In the drawings, reference numeral 1 denotes a plate portion having a certain thickness (for example, 5 mm), and a planar shape being a rectangle (for example, 42 mm in length, 126 mm in width, for example).

  The supporting pin 2 is integrally formed on one main surface of the plate portion 1 and has a conical shape in which the diameter at the tip portion is slightly smaller than the diameter at the base portion (for example, 6 mm). Further, the top of the support pin 2 is formed in a spherical shape (dome shape), and the height from the surface of the plate portion 1 is, for example, 15 mm. The reason why the top portion of the support pin 2 is spherical is to reduce damage when it hits the lower surface of the substrate.

  A large number (for example, 39) of the support pins 2 are provided on one main surface of the plate portion 1, and the substrate is supported on the lower surface by the support pins 2, 2,. be able to. A substrate support jig in which a large number of support pins 2, 2,... Are integrally formed on the surface of the plate portion 1 is formed by molding with foamed urethane having conductivity.

  Such a substrate support jig can easily join the lower surface (the surface opposite to the main surface on which the support pins 2 of the plate part 1 are formed) to other plates and plates with an adhesive or the like. Can be easily adjusted to fit the equipment. In addition, by bonding the side surface of one plate portion 1 to the side surface of the plate portion 1 of another substrate support jig, a plurality of substrate support jigs can be integrated to enlarge the substrate support jig. The size of the support jig can be increased according to the substrate to be supported.

  And since a board | substrate support jig | tool consists of an integrally molded product of a urethane foam, a processing waste, refuse, etc. do not generate | occur | produce. Therefore, there is no possibility that the supporting substrate is contaminated with processing waste or dust.

  In addition, since each of the supporting pins 2 has a spherical tip surface, an electronic component is already mounted on the lower surface of the supporting substrate (the substrate is a double-sided mounting type, and the electronic component is already mounted on one surface, If the substrate is to be supported by the electronic component mounted surface with the surface down), even if interference occurs with the electronic component, there is little risk of damage to the electronic component. Moreover, even if the interference is slightly strong, each support pin 2 is made of urethane foam and has elasticity, so that the substrate can be supported without damaging the electronic components by compressing and deforming due to the elasticity. The substrate can be pushed up in the state.

  In addition, when the interference is too strong, for example, when the height of the electronic component mounted on the lower surface of the substrate is high, the supporting pins 2 related to the interference may be removed, and the removal is performed by supporting the substrate. Since the jig is made of urethane foam, it can be done easily. Therefore, there is no need to restrict the placement of the support pins 2 when designing the mounting board. For example, even if there is a placement error with respect to the support pins 2, the electronic component may be damaged or troublesome repair work may be required. do not do. A foamed elastic material such as foamed urethane is extremely inexpensive, and can be used at low cost by preparing and standardizing the number of arrangements and arrangement patterns of a large number of support pins 2.

  The softness of the substrate support jig for supporting the substrate against the substrate and the ease of removing the support pins 2 are largely determined by the elastic modulus and compression rate of the substrate support jig. The degree of foaming can be adjusted. Therefore, it is possible to change the elastic modulus and compression rate in units of lots, for example, so as to suit the type and state of the substrate to be supported. Further, the surface treatment can be performed at the time of foaming, and the durability can be enhanced by the surface treatment.

  In addition, since the urethane foam is made conductive by including, for example, a conductive powder material, it is possible to prevent charging due to friction between the substrate and the electronic component mounted thereon and the substrate support jig. Accordingly, it is possible to eliminate the possibility that the electronic component is destroyed by the discharge generated by charging.

In order to correct the warp of the substrate to be supported by the substrate support jig, the shape of the support pins or the shape or material of the tip may be changed according to the substrate to be supported. For example, the support pin is made into, for example, a quadrangular pyramid shape, the curvature of the curved surface of the tip surface is changed, the foaming degree is partially changed, the color is partially changed, display, mark, classification, etc. For example, it can be formed. It is also conceivable to add a conventional support pin to the substrate support jig and use it together with the conventional pin system.

  DESCRIPTION OF SYMBOLS 1 ... Plate part, 2 ... Supporting pin.

Claims (3)

A step of holding the substrate so that the one surface of the substrate on which the electronic component is mounted on one surface is supported by a supporting member from the lower side to keep the plane;
Mounting the electronic component on the other surface of the substrate, and a method for manufacturing the mounting substrate,
The holding step includes
A step of elastically deforming and supporting the support pin at a location where the electronic component mounted on the one surface interferes with a plurality of support pins made of a foamed elastic material having a spherical tip.
The manufacturing method of the mounting board | substrate characterized by including.   The method for manufacturing a mounting board according to claim 1, wherein the support pins have conductivity.   A plurality of foamed elastic materials having a spherical tip at the time of holding the substrate so that the one surface of the substrate on which the electronic component is mounted on one surface is supported by a supporting member from below to maintain a flat surface. The mounting substrate holding method, wherein the supporting pin is elastically deformed and supported by the supporting pin at a location that interferes with the electronic component mounted on the one surface.

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