JP4558004B2 - Electronic components, shield covers, mother boards for multi-cavity, wiring boards and electronic equipment - Google Patents

Description

  The present invention relates to a communication device such as a mobile phone or a personal computer, an electronic component used by being incorporated in an electronic device, and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, electronic components including various electric circuits have been used in communication devices such as mobile phones, electronic devices, and the like.

  As such a conventional electronic component, for example, as shown in FIG. 8, an internal wiring conductor (not shown) such as a strip line or a ground wiring is formed inside a substantially rectangular multilayer wiring board 51 formed by laminating a plurality of insulating layers. ) Is embedded, and various electronic component elements (not shown) such as chip capacitors and diodes are mounted on the upper surface of the multilayer wiring board 51, and these are covered with a metal shield cover 52. Yes.

  The shield cover 52 has a rectangular top plate 52a, a side wall 52b provided on the outer periphery of the top plate 52a, and is arranged corresponding to the center position of each side of the top plate 52a. And four joint legs 52c.

  Then, the shield cover 52 is attached to the multilayer wiring board 51 at the center position of each side of the multilayer wiring board 51 among the plurality of end surface through holes 54 formed on the side surface of the multilayer wiring board 51. The four joint legs 52c are accommodated one by one in each end face through hole 54, and the joint leg 52c and the end face electrode conductor 55 attached to the inner surface of the end face through hole 54 are connected via solder. This is done by bonding.

  The end surface through hole 54 is formed so as to penetrate the side surface of the multilayer wiring substrate 51 from the upper surface to the lower surface of the multilayer wiring substrate 51, and the end surface electrode conductor 55 is deposited on the entire inner surface. These end face electrode conductors 55 are connected to connection pads on the motherboard side via solder when the electronic component 50 is mounted on the motherboard.

Note that the end surface electrode conductor 55 attached to the four end surface through holes 54 in which the joint legs 52c are accommodated functions as a ground terminal so that the shield cover 52 is held at the ground potential when the electronic component is used. It has become.

Thus, the circuit can be stably operated by shielding electromagnetic waves from the outside.

  Next, a method for manufacturing the above-described conventional electronic component will be described.

As a method for manufacturing such a conventional electronic component, a multi-cavity method is used in which individual electronic components are obtained by dividing a large mother board partitioned into a plurality of substrate regions, as shown below. In addition, there is a case where a margin area is provided between the substrate areas and a case where a margin area is not provided.

  First, a case where a marginal area is provided between the substrate areas will be described with reference to FIG.

9A is a plan view of a state in which the shield cover 52 is placed on the mother board 100, and FIG. 9B is a cross-sectional view taken along the line a-a 'of FIG. 9A.

9A shows a state where the shield cover 52 is placed on a part of the mother board.

  In this method of manufacturing an electronic component, first, a mother board 100 having a substrate area arranged in a matrix with a marginal area 102 interposed therebetween is prepared, and the substrate area is abandoned at the center outside the substrate area. After the through hole 101 is formed so as to straddle the boundary 103 between the regions, the conductor film 104 is deposited by plating the inner surface of the through hole. Next, cream solder 106 is filled into the through hole 101 and the electronic component element 105 is mounted on each substrate region. After that, a plurality of shield covers 52 are prepared, and one joint leg 52c of the shield cover 52 is inserted into each through hole 101 one by one, and the solder paste 105 is melted and hardened to form the joint leg 52c inside the through hole. Bonded to the conductor film 104 deposited on the substrate. Finally, the mother board 100 is cut along the boundary 103 to obtain individual electronic components as shown in FIG. 8 (see, for example, Patent Document 1).

  Next, a case where no surplus area is provided between the substrate areas will be described with reference to FIG. FIG. 10A is a plan view of a state in which the shield cover 52 is placed on the mother board 100, and FIG. 10B is a cross-sectional view taken along the line a-a 'in FIG. FIG. 10A shows a state where the shield cover 52 is placed on a part of the mother board.

In such an electronic component manufacturing method, first, a mother substrate 100 having a plurality of substrate regions in which substrate regions are arranged close to each other without providing a marginal region therebetween is prepared, and then is formed at a central portion outside the substrate region. The through hole 101 is formed so as to straddle the boundary 103 between the adjacent substrate regions. Next, the solder paste 106 is filled in the through hole 101 and the electronic component element 105 is mounted on each substrate region. Next, a plurality of the shield covers 52 described above are prepared, and these shield covers 52 are placed on the corresponding substrate regions of the mother board 100, and the adjacent joint legs of the adjacent shield covers 52 are made the same. After inserting into the through hole 101 and then melting and hardening the cream solder 106, the joint leg 52c is soldered to the conductor film 104 attached to the inner surface of the through hole. Finally, by cutting the mother board 100 along the boundary 103, individual electronic components are obtained (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 10-13078 Japanese Patent Laid-Open No. 11-31893

  By the way, the conventional electronic component described above is provided such that the joint leg portion 52c standing at the lower end portion of the side wall 52b of the shield cover 52 is arranged at the center of each side of the top plate 52a. Therefore, the end surface through hole 54 formed on the side surface of the multilayer wiring board in which the joining leg portion 52 c is accommodated is formed at the center position of each side of the multilayer wiring board 51. In such an electronic component, the following problems occur when a large number of electronic components are taken using the mother board 100 having a plurality of substrate regions.

  First, in the case where the separation region 102 is provided between the substrate regions of the mother substrate 100, the end surface through hole 54 that accommodates the joining leg portion 52 c of the shield cover 52 is formed at the center position of each side of the multilayer wiring substrate 51. If so, the adjacent through holes are arranged in parallel to one side of the mother board 100. In this case, if the width d of the marginal area 102 is narrowed, adjacent through-hole portions will come into contact with each other. Therefore, the width d of the marginalization region is widened so that the through-hole portions do not contact each other. A sufficient space must be provided between the two through holes inside. As a result, the ratio of the abandoned area 102 occupying the mother board 100 is increased, and the number of electronic components that can be acquired from one mother board is reduced, resulting in a problem that the production efficiency of the electronic parts is lowered.

On the other hand, when the replacement area 102 is not provided between the substrate areas of the mother board 100, a larger number of board areas can be secured in the mother board 100. Therefore, a problem that occurs when the above-described board area is provided with a replacement area. Is resolved. However, in this case, the joining leg portions of adjacent shield covers 52 are inserted into one through hole 101 formed so as to straddle the boundary 103 between the substrate regions. Thus with respect to one through-hole 101, the joint leg 5 2c separate shield cover 52 is inserted, when the molten solder paste filled in the through hole 101, solder wetting between the shield cover Differences in the amount of solder adhering to the joining leg portion 52c occur due to differences in properties. As a result, on the shield cover side having low solder wettability among the adjacent shield covers 52, the amount of solder adhering to the joint leg 52c is insufficient, and the connection strength of the shield cover 52 is reduced. As a result, there arises a problem that the reliability of the electronic component is lowered due to the shield cover 52 being easily removed when an impact is applied to the electronic component or when a thermal stress is applied. Further, on the shield cover side having high solder wettability among the adjacent shield covers 52, the solder adhering to the joining leg portion 52c is excessively supplied. Therefore, there arises a problem that the productivity of the electronic component is lowered by causing a short circuit between the wirings on the multilayer wiring board or between the shield cover 52 and the other wirings by an excessive amount of solder.

  The present invention has been devised in view of the above problems. The purpose of the present invention is to increase the connection reliability of the shield cover regardless of whether or not to provide a spare area between board areas when a large number of electronic components are taken. An object of the present invention is to provide an electronic component that can be maintained and that is excellent in productivity and a method for manufacturing the same.

The multi-chip mother board of the present invention is for picking up a large number of electronic components, and has a plurality of rectangular substrate areas arranged in a row, and a boundary portion between adjacent board areas. Includes one circular hole formed so as to straddle the outer periphery of at least one substrate region, and the other circular hole formed so as to straddle the outer periphery of at least the other substrate region. Are formed independently of each other, and the one hole and the other hole are arranged at a substantially point-symmetrical position with respect to the center point of the boundary, and sandwich the boundary In the outer periphery of the adjacent substrate region, no hole is present at a position facing each of the arrangement positions of the one hole and the other hole.

Multi-piece for the mother board of the present invention, the distance between the centers of the said one of the holes and the other hole portion, according to claim 1, characterized in that larger than the diameter of these holes Mother board for multi-cavity .

  According to the present invention, the pair of legs provided on the opposing sides of the rectangular top plate constituting the shield cover is substantially point-symmetric with respect to the centroid when the top plate is viewed in plan, and the opposing sides Since there is a spare area between the board areas of the mother board when picking up a large number of electronic components, the spare area is smaller than the conventional area. Width d can be greatly reduced. That is, between the adjacent substrate regions, one hole and the other hole are arranged so as to be substantially point-symmetric with respect to the center point of the boundary portion, so that both holes do not contact each other. The width d of the abandonment area can be reduced. As a result, the ratio of the abandoned area to the mother board is reduced, and as a result, a larger board area can be secured, thereby increasing the number of electronic parts that can be acquired from one mother board and improving the productivity of electronic parts. To be able to. Moreover, when there is no surplus area between board | substrate area | regions, when attaching a shield cover, the leg part of an adjacent shield cover can be inserted in a separate through-hole.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the present embodiment, a voltage controlled oscillator will be described as an example of the electronic component.

  FIG. 1 is a perspective view of an electronic component according to the present invention. FIGS. 2A and 2B are side views of the electronic component shown in FIG. 1 when viewed from the A direction and the B direction, respectively. FIG. 2 is a cross-sectional view taken along line CC ′ of the electronic component shown in FIG. 1. The electronic component shown in the figure is generally composed of a multilayer wiring board 1 and a shield cover 2.

  As shown in FIG. 3, the multilayer wiring board 1 is constituted by a substantially rectangular laminated body in which a plurality of insulating layers 1a to 1c are laminated in the thickness direction. Between these insulating layers, ground wiring or A number of internal wiring conductors 5 such as strip lines and internal wiring conductors are interposed, and these internal wiring conductors 5 are electrically connected to each other through via-hole conductors 6 embedded in an insulating layer.

  On the upper surface of the multilayer wiring board 1, various electronic component elements 7 constituting a voltage-controlled oscillator circuit such as a chip capacitor, a diode, and a transistor are mounted. These electronic component elements 7 are electrically connected to a surface wiring conductor (not shown) formed on the upper surface of the multilayer wiring board via a conductive adhesive such as solder or a bonding material such as a fine metal wire. Furthermore, a predetermined electric circuit is configured by electrically connecting the surface wiring conductor and the internal wiring conductor 5 via a via-hole conductor or the like.

  As a material of the insulating layers 1a to 1c constituting the insulating layer 1 constituting such a multilayer wiring substrate 1, a ceramic material such as glass ceramic is used, and the thickness of each insulating layer is set to 50 μm to 300 μm, for example. Is done.

  In addition, when the insulating layer is made of a ceramic material, the multilayer wiring board 1 is obtained by laminating a predetermined number of ceramic green sheets obtained by adding and mixing an appropriate organic solvent, an organic solvent, etc. to the ceramic raw material powder. It is manufactured by press-molding this, and then firing the laminate at a high temperature and processing the outer shape.

  The internal wiring conductor 5 and the surface wiring conductor provided on the multilayer circuit board 1 are made of a conductive material such as silver or copper, and the thickness thereof is set to, for example, 5 μm to 30 μm. The via-hole conductor is similarly made of a conductive material such as silver or copper, and its diameter is set to 20 μm to 100 μm, for example.

  When the multilayer wiring board 1 is manufactured, the internal wiring conductors 5 and the surface wiring conductors are formed by applying a conductive paste containing conductive material powder such as silver or the like by conventional screen printing before the ceramic green sheets are laminated. It is formed by printing / coating a predetermined pattern on the surface of the ceramic and simultaneously firing the ceramic green sheet.

  The via-hole conductor 6 is formed by applying and filling a conductive paste by screen printing or the like in a through-hole previously provided in the ceramic green sheet, and simultaneously firing the ceramic green sheet at the time of firing. The

  On the other hand, various terminal electrodes 8 are provided on the lower surface of the multilayer wiring board 1. In the present embodiment, eight terminal electrodes are provided, four terminal electrodes functioning as ground terminals are provided at the center of each side of the lower surface, and input terminals, output terminals, power supplies are provided at the lower four corners. Terminal electrodes functioning as terminals and signal control terminals are formed. These terminal electrodes 8 are made of, for example, a conductive material such as silver or copper, and the thickness of each terminal electrode 8 is set to, for example, 5 μm to 20 μm.

  On the side surface of the multilayer wiring board 1, a notch 4 is formed for accommodating a joint leg 2 b provided on a shield cover 2 described later. The notch 4 is formed by providing a through hole in the end surface of the insulating layer 1a disposed on the uppermost layer of the multilayer wiring board and exposing the upper surface of the second insulating layer 1b. That is, the notch 4 has a depth in the stacking direction corresponding to the thickness of the insulating layer 1a, the upper end of which opens on the upper surface of the multilayer wiring board 1, and the lower end of the notch 4 corresponds to the upper surface of the insulating layer 1b. Will be located. If the notch 4 is formed in this way, the region below the notch 4 of the insulating layers 1b and 1c is compared with the case where the notch 4 is formed so as to penetrate the side surface of the multilayer wiring board. In addition, since a space for providing an internal wiring conductor, a via-hole conductor, and the like can be secured, the inside of the multilayer wiring board 1 can be effectively used for wiring.

  A bonding conductor 5a is led out on the upper surface of the insulating layer 2b exposed by the notch 4. The bonding conductor 5a is for mechanically and electrically connecting the shield cover 2 to the multilayer wiring board 1, and is connected to the bonding leg 2b of the shield cover 2 via the solder 3. The bonding conductor 5a is electrically connected to a ground terminal provided on the lower surface of the multilayer wiring board 1 via a via-hole conductor or the like so that the shield cover 2 is held at the ground potential when the electronic component is used. Will be able to. Thus, the conductor for connecting the joining leg 2b of the shield cover 2 is exposed from the cutout portion 4 without being subjected to a complicated process such as plating. Therefore, the productivity of electronic parts can be improved.

  The notch 4 has, for example, a semi-cylindrical shape, and its lateral width is set to be equal to or less than half the lateral width of the side surface of the multilayer wiring board on which the notch 4 is formed.

  On the other hand, the shield cover 2 is placed on the multilayer wiring board so as to cover the electronic component element 7. The shield cover 2 includes a top plate 2a made of a rectangular flat plate, and a pair of joining leg portions 2b and a pair of contact leg portions 2c that are erected on the outer peripheral portion of the top plate 2a.

  FIG. 4 is a plan view of the shield cover 2 as viewed from the surface on which the multilayer wiring board is placed, and the pair of joint legs 2b are only on one of the two opposing sides of the top plate 2a. The pair of joint legs 2b are substantially point-symmetric with respect to the center of the centroid G when the top plate 2a is viewed in plan, and are shifted in a predetermined direction from the centers M1 to M4 of the opposite sides. Are arranged. Here, the centroid when the flat plate 2a is viewed in plan refers to the intersection of diagonal lines of the top plate 2a.

Because it is coordinated only such bonded leg 2b to the one of the opposing sides of the two pairs of opposing sides of the top plate 2a, a multilayer wiring board notches 4 for accommodating the joint leg 2 b The number of notches 4 formed in the multilayer wiring board 1 is reduced, and a space or an electronic component element for forming a wiring conductor inside or on the upper surface of the multilayer wiring board 1 is sufficient. The space for mounting is sufficiently secured, and the electronic component can be miniaturized.

  In addition, a pair of contact legs 2 c that are in contact with the upper surface of the multilayer wiring board 1 are provided upright on the other opposing side where the joining legs 2 b are not arranged. The contact legs 2c are arranged substantially symmetrically with respect to the centroid of the top plate 2a, and when the shield cover 2 is attached, the shield cover 2 is effectively prevented from being tilted to stabilize the shield cover 2. In this state, it can be attached to the multilayer wiring board 1.

  Further, the position where the pair of joint legs 2b and the pair of contact legs 2c are shifted by a substantially equal distance t from the midpoint of each side of the top plate 2a counterclockwise along the outer periphery of the top plate 2a. The shield cover 2 can be attached to the multilayer wiring board 1 in a more stable state.

  Such a shield cover 2 is made of a known metal processing so that the top plate 2a has a rectangular shape slightly smaller than the outer shape of the multilayer wiring board 1 by using a metal material such as 42 alloy, Kovar, phosphor bronze, or iron. Produced by the law.

  The shield cover 2 is attached to the multilayer wiring board 1 by first applying and filling cream solder with a dispenser or the like in the formation region of the cutout portion 4 where the bonding conductor 5a is led out. In addition, the shield cover 2 is placed on the multilayer wiring board in a state where the contact leg 2c is in contact with the upper surface of the multilayer wiring board, and the joint leg 2b is accommodated in the notch 4, and the cream solder is melted. Then, the bonding leg 2b and the bonding conductor 5a are bonded to each other through solder, and at the same time, the ground terminal and the shield cover 2 are electrically connected.

  Thus, when the electronic component described above is used, the shield cover 2 is held at the ground potential, and the electromagnetic wave from the outside is well shielded by the shield cover 2 so that the electronic component can be operated stably. Will be able to. In this embodiment, as shown in FIG. 2, there is a portion where the side surface side of the electronic component element is not covered by the shield cover 2, but if the upper surface of the electronic component element is covered by the top plate 2a, The electromagnetic wave from the can be sufficiently shielded. Further, in this case, the shield case 2 can be easily manufactured only by erecting the joint leg 2b and the contact leg 2c on the flat top plate 2a.

  Next, a method for manufacturing the electronic component described above will be described with reference to FIG. 5A is a plan view of the state in which the shield cover 2 is placed on the mother board 20, and FIG. 5B is a cross-sectional view taken along the line aa ′ in FIG. 5A. 5A shows a state where the shield cover 2 is placed on a part of the mother board 20. FIG.

(Process A)
First, a plurality of rectangular substrate regions are arranged in a line, and at least one other hole 21a is formed at the boundary between adjacent substrate regions so as to straddle the outer periphery of at least one substrate region. The other hole 21b is arranged so as to straddle the outer periphery of the substrate area at a position where both the holes are substantially point-symmetric with respect to the center point of the boundary part and deviated from the center point in a predetermined direction. A mother substrate 20 formed as described above is prepared.

  The mother board 20 is formed, for example, by laminating a plurality of insulating sheets 20a to 20c made of a ceramic material such as glass-ceramic or alumina ceramic via a conductor pattern serving as an internal wiring conductor. A conductor pattern to be a surface wiring conductor is deposited and formed on each substrate region on the upper surface of the substrate.

  The insulating sheets 20a to 20c constituting the mother substrate 20 are, for example, a predetermined slurry by a conventionally known doctor blade method or the like obtained by adding and mixing an appropriate organic binder, organic solvent or the like to ceramic material powder. The tape is molded into a thickness to form a semi-cured ceramic green sheet, which is laminated and press-molded, and then fired at a high temperature.

  In addition, a conductor pattern to be an internal wiring conductor or a surface wiring conductor is manufactured by printing and applying a conductive paste in a predetermined pattern on the surface of a ceramic green sheet and firing it at a high temperature with an insulating sheet. As the conductive paste, for example, an Ag-based powder such as Ag, Ag-Pd, or Ag-Pt, a borosilicate low-melting glass frit, an organic binder such as ethyl cellulose, and an organic solvent are used.

  One hole 21a is formed so as to straddle one substrate region and the other hole 21b is formed so as to straddle the other substrate region at the boundary between adjacent substrate regions of the mother substrate 20 thus obtained. Is formed so that one hole 21a and the other hole 21b are positioned substantially symmetrically with respect to the center point of the boundary. Here, the boundary portion refers to a rectangular marginal region 22 sandwiched between adjacent substrate regions, and the center point of the boundary portion refers to a point where diagonal lines of the marginal region 22 intersect. In addition, when one substrate region is viewed, the pair of hole portions arranged through the substrate region are substantially point-symmetric with respect to the centroid when the substrate region is viewed in plan, and the hole portion 21. Is positioned so as to be shifted in the opposite direction along the outer periphery from the midpoint of the outer periphery of the substrate region where the substrate is formed.

  The center-to-center distance x between the one hole 21a and the other hole 21b is set to be larger than the diameter of the hole 21.

  By positioning the hole 21 in this manner, the width d of the marginal region 22 can be greatly reduced. That is, since the one hole portion 21a and the other hole portion 21b are arranged so as to be substantially point-symmetric with respect to the center point of the boundary portion, both holes are formed even if the width d of the marginal region 22 is reduced. The parts never touch. As a result, the proportion of the abandoned area 22 occupying the mother board 20 can be reduced, and the number of electronic components that can be acquired from the mother board 20 can be increased correspondingly, so that the productivity of the electronic parts can be improved. It becomes like this.

  Prior to laminating the insulating sheets 20a to 20c, such a hole 21 is formed by previously forming a through hole by punching, laser or the like at a predetermined position as described above of the insulating sheet 20a disposed in the uppermost layer. The insulating sheet 20a is formed by placing the insulating sheet 20a on the insulating sheet 20b so that the bonding conductor 5a provided on the upper surface of the second insulating sheet 20b is exposed from the through hole. .

(Process B)
Next, the electronic component element 7 is mounted on each board region of the mother board 20. The mounting of the electronic component element 7 is performed by first applying a conductive adhesive such as cream solder to the surface wiring conductor for mounting the electronic component element provided on the upper surface of the mother board by screen printing or the like. Various electronic component elements such as capacitors, diodes, and transistors are placed on a surface wiring conductor coated with a conductive adhesive, and finally cream solder is melted and cured.

(Process C)
Next, a plurality of shield covers 2 each having a rectangular shape and provided with a pair of joint legs 2b on opposite sides are placed on the corresponding substrate region, and one of the adjacent shield covers The joining leg 2b of the shield cover 2 is inserted into the one hole 21, and the joining leg 2b of the other shield cover 2 is inserted into the other hole 21, respectively.

  The shield cover 2 includes a rectangular top plate 2a, and a joining leg portion 2b and a contact leg portion 2c provided upright on the outer periphery of the top plate 2a. The joint leg 2b is disposed only on one of the two opposing sides of the top plate 2a, and the pair of joint legs 2b is the center of the centroid when the top plate 2a is viewed in plan view. Are arranged symmetrically with respect to each other and shifted in a predetermined direction from the centers of the opposite sides.

  In addition, a pair of contact legs 2 c that are in contact with the upper surface of the multilayer wiring board 1 are provided upright on the other opposing side where the joining legs 2 b are not arranged. The contact legs 2c are arranged substantially symmetrically with respect to the centroid of the top plate 2a, and when the shield cover 2 is attached, the shield cover 2 is effectively prevented from being tilted to stabilize the shield cover 2. In this state, it can be attached to the multilayer wiring board.

  Such a shield cover 2 is manufactured by a conventionally well-known metal processing method so that the top plate 2a has a slightly smaller rectangular shape than the substrate region by using a metal material such as 42 alloy, Kovar, phosphor bronze, or iron. Is done.

(Process D)
Next, the joining leg 2b and the joining conductor 5a provided on the inner surface of the hole 21 are joined via solder.

In order to attach the shield cover 2 to the multilayer wiring board 1, first, cream solder 23 is applied and filled into the formation region of the hole 21 from which the bonding conductor 5a is led out using a dispenser or the like. Next, the shield cover 2 is placed on the multilayer wiring board in a state where the contact leg 2c is in contact with the board area on the upper surface of the mother board, and each joining leg 2b is inserted into the hole 21 one by one. To do. Finally, so that the joining legs 2b by the curing by melting the cream solder 23 is mechanically and electrically connected via the solder bonding conductor 5a.

(Process E)
Finally, the mother board 20 is divided into a plurality of electronic components by collectively cutting along the outer periphery of each board area.

  The mother substrate 20 is cut by recognizing the cutting position by reading the marking on the outer periphery of the mother substrate with an image recognition device, and then using a dicer or the like in a matrix form along the outer periphery of each substrate region. A plurality of electronic components as shown in FIG. 1 can be obtained at the same time.

  In addition, this invention is not limited to the above-mentioned embodiment, A various change, improvement, etc. are possible in the range which does not deviate from the summary of this invention.

  In the embodiment described above, the upper end of the notch 4 is opened at the upper surface of the multilayer wiring board 1 and the lower end is positioned at a height corresponding to the upper surface of the insulating layer 1b located at the second layer of the multilayer wiring board 1. However, the notch portion 4 may be formed so that the lower end thereof is positioned at a height corresponding to the upper surface of the insulating layer 1c located at the lowermost layer. You may form so that a lower end may open to the lower surface of the multilayer wiring board 1, ie, it may penetrate from the upper surface of the multilayer wiring board 1 to a lower surface.

  Further, in the embodiment described above, the shield cover 2 is formed by the flat top plate 2a and the joining leg portion 2b and the contact leg portion 2c which are erected directly on the top plate 2a. However, as shown in FIG. The side wall 10 may be provided on the outer periphery of the plate 2a, and the joint leg 2b and the contact leg 2c may be erected on the lower end of the side wall 10. In this case, since the side surface side of the electronic component element 7 is also covered with the shield cover 2, electromagnetic waves from the outside can be shielded more effectively.

  Furthermore, in the embodiment described above, the cutout portion 4 is formed so as to have a semi-cylindrical shape, but the shape of the cutout portion 4 is not limited to this, and may be formed in other shapes such as a quadrangular prism shape, for example. It doesn't matter.

Further, in the above-described embodiment, the separation region is provided between the substrate regions of the mother substrate 20, but as shown in FIG. 7, the substrate regions are arranged close to each other without providing any separation region. It doesn't matter if you do. In this case, the boundary portion indicates the outer periphery of the substrate region, and the center point of the boundary portion indicates the middle point of the outer periphery. Accordingly, the one hole portion 21a and the other hole portion 21b are formed so as to straddle both of the adjacent substrate regions, and the both hole portions are arranged symmetrically with respect to the midpoint of the periphery outside the substrate region. After preparing the mother board 20 in which such holes 21 are formed (process A ), a plurality of electronic components can be obtained by performing processes B to E similar to those in the above-described embodiment. Even in the case where the abandoned area is not provided as described above, the joint leg 2b of one shield cover 2 of the adjacent shield covers 2 is used as one hole 21a and the joint leg 2b of the other shield cover 2 is used. By inserting each into the other hole 21b, a predetermined amount of solder can be uniformly attached to each joint leg 2b, improving the connection reliability of the shield cover 2 and the productivity of electronic parts. It becomes possible to make it. Further, in this case, since there is almost no marginal area, it becomes possible to secure a larger board area on the mother board 20, thereby improving the productivity of electronic components.

It is a perspective view of the electronic component which concerns on one Embodiment of this invention. (A) is a side view when the electronic component in FIG. 1 is viewed from the A direction, and (b) is a side view when the electronic component in FIG. 1 is viewed from the B direction. It is sectional drawing when the electronic component of FIG. 1 is cut | disconnected by the C-C 'line | wire. It is a top view when the shield cover of the electronic component of FIG. 1 is seen from the mounting surface side on the multilayer wiring board. It is a figure for demonstrating the manufacturing method of the electronic component which concerns on one Embodiment of this invention, (a) is a top view which shows the state which mounted the shield cover in the mother board, (b) is aa It is sectional drawing of a line. It is a perspective view of the electronic component which concerns on other embodiment of this invention. It is a figure for demonstrating the manufacturing method of the electronic component which concerns on other embodiment of this invention, (a) is a top view which shows the state which mounted the shield cover in the mother board, (b) is a- It is sectional drawing of a 'line. It is a disassembled perspective view of the conventional electronic component. It is a figure for demonstrating the manufacturing method of the conventional electronic component, (a) is a top view which shows the state which mounted the shield cover in the mother board, (b) is sectional drawing of aa 'line. is there. It is a figure for demonstrating the manufacturing method of the conventional electronic component, (a) is a top view which shows the state which mounted the shield cover in the mother board, (b) is sectional drawing of aa 'line. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... multilayer wiring board 2 ... shield cover 3 ... solder 4 ... notch part 7 ... electronic component element 20 ... mother board 21 ... hole

Claims (2)

A mother board for taking a large number of electronic components, and has a plurality of rectangular board areas arranged in a row, and at the boundary between adjacent board areas, at least one of the board areas. One circular hole formed so as to straddle the periphery and the other circular hole formed so as to straddle the outer periphery of at least the other substrate region are formed independently. The one hole part and the other hole part are arranged at a substantially point-symmetrical position with respect to the center point of the boundary part, and on the outer periphery of the substrate region adjacent to the boundary part. Is a mother board for multi-piece production, wherein no hole is present at a position facing each of the arrangement positions of the one hole and the other hole.
Multi-piece for the mother substrate according to claim 1, the distance between the centers of and the one of the holes the other hole portion, being larger than the diameter of these holes.

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