JP2011165899A - Method of manufacturing wiring board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a wiring board capable of reliably reducing deformation of a metal frame, and warpage and cracks of a multiple-pattern base board when tentatively mounting the metal frame on a metalized layer formed on a surface of each wiring board and having a rectangular shape in a plan view, in a manufacturing method by multiple patterning of a wiring board. <P>SOLUTION: The method of manufacturing a wiring board 8 includes a tentatively-mounting step of mounting a metal frame 16 having a rectangular shape in a plan view and arranged with a brazing material layer 15 on the bottom surface on a metalized layer 14 formed along respective sides of a surface 3 for each wiring board 8 and having an oblong (rectangular) frame-like shape in a plan view, individually bringing a pair of electrodes 18 into contact with two parts on the upper surface of the metal frame 16 to carry a current thereto, and melting/solidifying only a part of the brazing material layer 15, thereby fixing the metal frame 16 to the surface 3 of the wiring board 8. In the tentatively-mounting step of the method of manufacturing a wiring board 8, the current is carried to the pair of electrodes 18 in the state individually brought into contact with positions in the vicinities of both ends of one long side without becoming point-symmetrical with respect to the center cp of four sides constituting the metal frame 16 in a plan view out of the upper surfaces of the four sides. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a wiring board that is entirely box-shaped and sealed on a metal frame provided in the opening with a cover plate, or a metal board that is entirely plate-shaped and provided along the periphery of the surface. The present invention relates to a method of manufacturing a plurality of wiring boards sealed with a box-shaped lid.

For example, a metallized layer sealing material is formed on the upper surface of a rectangular package in a box-shaped package containing electronic components such as a crystal resonator inside, and Au-Sn provided along the sealing material After the low melting point metal such as an alloy or solder is point-sealed in two or four points that are symmetrical with respect to each other in a plan view and temporarily attached, the whole of the low melting point metal is thermally fused. A method for sealing a small electronic component package in which a metal lid placed on a sealing portion is fixed has been proposed (for example, see Patent Document 1).
Furthermore, in order to temporarily fix a metal ring similar to this on a rectangular metal layer formed on the ceramic substrate in a required posture, a temporary fixing agent made of an acrylic resin is at least on the opposite side of the metal layer. A pair of (point-symmetrical positions) or more is applied in the form of a dot, and a rectangular metal ring clad with a frame-shaped metal layer and a metal solder having the same plan view is placed on the plurality of temporary fixing agents, There has also been proposed a brazing method for a rectangular metal ring in which the metal braze is melted and the temporary fixing agent is evaporated or thermally decomposed to join a metal ring onto a ceramic substrate (see, for example, Patent Document 2).

By the way, when a similar metal frame is fixed on a rectangular metal layer formed on the surface of a substrate made of an insulating material, as in the rectangular metal ring brazing method described in Patent Document 2. If a temporary fixing agent made of a resin is used, a fine gap may be generated at the temporarily fixed position, which may impair the sealing performance between the metal layer and the rectangular metal ring.
On the other hand, instead of the resin temporary fixing agent, it is possible to temporarily attach using a low melting point metal such as solder as disclosed in Patent Document 1.
However, in a manufacturing method using a large number of wiring boards, at least one pair of the low melting point metals is melted at a point-symmetrical position between a metal layer and a metal frame that are rectangular in plan view, and temporarily attached. In such a case, warp and cracks may occur in the base substrate for taking a large number of pieces, or the metal frame may be deformed due to the stress generated as the low melting point metal melts and solidifies. Due to this, the sealing performance between the metal frame and the metal lid may be impaired.

JP 2004-6457 A (pages 1 to 4, FIGS. 1 to 3) JP 2007-237239 A (pages 1 to 15, FIGS. 1 to 4)

  The present invention solves the problems described in the background art and temporarily attaches a metal frame on a metallized layer having a rectangular shape in plan view formed on the surface of each wiring board in a method of manufacturing a wiring board by multi-cavity. In doing so, it is an object to provide a method of manufacturing a wiring board that reliably reduces the deformation of the metal frame and the occurrence of warping and cracking of a base substrate for taking multiple pieces.

Means for Solving the Problems and Effects of the Invention

In order to solve the above-mentioned problem, the present invention temporarily fixes the brazing material by melting and solidifying at only one place between the metallized layer and the metal frame having a rectangular plan view formed on the surface of each wiring board. It was created with the idea in mind.
That is, a method for manufacturing a wiring board according to the present invention (Claim 1) is a multi-piece manufacturing method in which a plurality of wiring boards made of an insulating material and having a front surface and a back surface that are rectangular in plan view are arranged along a vertical and horizontal plane direction. On the base substrate, a metal frame having a rectangular shape in plan view and a brazing material layer disposed on the bottom surface is mounted on the metallized layer having a rectangular shape in plan view formed along each side of the surface of each wiring board. A pair of electrodes are individually contacted and energized at two locations on the upper surface of the metal frame, and only a part of the brazing material layer is melted and solidified, whereby the metal frame is placed on the surface of the wiring board. A method of manufacturing a wiring board including a fixing step of fixing, wherein in the temporary fixing step, the pair of electrodes are mutually connected to the center of the four sides of the upper surface of the four sides constituting the metal frame in a plan view. Individual at two positions that are not point-symmetric It is energized in contact with, and wherein the.

According to this, the current supplied from the pair of electrodes flows through a relatively short path among the two paths separating the pair of electrodes on the four sides constituting the metal frame in plan view. The thermal energy is highest at an intermediate position that bisects the short path and at a position farthest from each electrode. As a result, only one (partial) brazing material layer at the intermediate position melts into a small circle (dot). Since the metal frame is temporarily attached to the metallized layer through only a part of the molten and solidified brazing material layer, the brazing material is compared with the conventional method of temporarily attaching at two or more point symmetrical positions. The stress generated in the metal frame and the base substrate for taking a large number due to melting and solidification of the metal is reduced. Therefore, defects such as warpage and cracks in the base substrate and thermal deformation of the metal frame can be reliably reduced, and a wiring substrate with high sealing performance can be efficiently manufactured.
After the temporary (brazing) step, a metallized layer for each wiring board is formed by a main (brazing) step of melting and solidifying the entire brazing material layer in a heating furnace with a base substrate for multi-piece taking. A metal frame is fixed along these entire circumferences.

The insulating material includes various ceramics or various resins.
The rectangle includes a rectangle and a square.
Furthermore, the surface of the wiring board has a flat surface, four side walls along the four sides of the surface in plan view, and a rectangular shape in which the plan view surrounded by these is substantially similar to the surface. A form having a cavity having a bottom surface is also possible.
The pair of electrodes may be in the form of a pin in addition to a rollable roller.
In addition, the part where a part of the brazing material layer is melted and solidified includes not only the circular shape but also an elliptical shape.

In the present invention, in the tacking step, the pair of electrodes are in contact with the vicinity of both ends of any one of the four sides constituting the metal frame in a plan view, or a pair of adjacent pairs. Also included is a method of manufacturing a wiring board in which power is supplied while being in contact with the middle positions of the sides (claim 2).
According to this, by the current fed from the pair of electrodes, an intermediate position that bisects any one of the four sides constituting the metal frame, or between the middle of a pair of adjacent sides. At an intermediate position that bisects (in the case of a metal frame having a square shape, near its corner), the thermal energy is highest, and only one brazing material layer at these positions is melted and solidified into a small circular shape. As a result, compared to the conventional method, the stress generated in the metal frame and the base substrate for multi-cavity is reduced, so that the base substrate is warped or cracked, or the metal frame is thermally deformed. It becomes possible to reduce it reliably.

Further, according to the present invention, in the tacking step, the pair of electrodes includes an intermediate position of one side of the pair of adjacent sides of the metal frame in a plan view, and the other side and from one side. Also included is a method for manufacturing a wiring board in which power is supplied in contact with a remote end (claim 3).
According to this, the current fed from the pair of electrodes is separated from the middle position of one side and the other side and from one side of a pair of adjacent sides of the four sides constituting the metal frame. At an intermediate position that bisects the edge, the heat energy is highest, and only one brazing material layer at this position is melted and solidified in a small circular shape. As a result, it is possible to reliably reduce the same problems as described above.

Further, according to the present invention, the surfaces of the plurality of wiring boards are rectangular in plan view, and in the tacking step, the pair of electrodes are a pair of opposing ones of the four sides constituting the metal frame in plan view. Also included is a method for manufacturing a wiring board in which power is supplied in a state of being individually in contact with different positions excluding the vicinity of the center in the longitudinal direction for each short side.
According to this, by the electric current supplied from the pair of electrodes, the long side sandwiched between the pair of opposing short sides among the four sides constituting the metal frame, and the distance between the contact positions of the electrodes is almost equal. At the intermediate position to be divided, the voltage and heat energy are highest, and only one brazing material layer at this position is melted and solidified in a small circular shape. As a result, it is possible to reliably reduce the same problems as described above.

In addition, according to the present invention, the pair of electrodes used in the tacking step can be moved toward and away from the surfaces of the plurality of wiring boards and can be moved along the surfaces of the wiring boards. A method of manufacturing a wiring board which is a roller electrode is also included.
According to this, the upper surface of the metal frame with respect to the wiring substrate which is arranged along the plane direction in the vertical and horizontal directions on the multi-piece base substrate and the metal frame with the brazing material layer is placed on the metallized layer. A pair of roller electrodes are individually brought into contact with the two positions in the substrate and energized, and a part of the brazing material layer at the intermediate position is melted and solidified into a circular shape, and then separated from the wiring board and further adjacent Can be sequentially moved to the wiring board side. Therefore, it becomes easy to perform the temporary attachment automatically by sequentially bringing a pair of roller electrodes into contact with each wiring board on which the metal frame is placed on the metallized layer. In addition, since the roller electrode can roll on the metal frame, it is less likely to be worn and superior in durability compared to the pin-shaped electrode, so that maintenance is also facilitated.
In addition, by using at least one of the relative distance and the arrangement of the pair of electrodes as an adjustable welding (joining) device, it is easy to cope with various types of wiring boards.

The top view which shows the multi-piece wiring board of one form used as the object of this invention. The enlarged plan view of the dashed-dotted line part X in FIG. Sectional drawing along the arrow of the YY line in FIG. The fragmentary sectional view which shows the outline of one manufacturing process of this invention. The fragmentary sectional view which shows the outline of the manufacturing process following FIG. Schematic which shows each manufacturing process of FIG. 4, FIG. The partial top view which shows the contact position of a pair of electrode in the manufacturing process of FIG. FIG. 6 is a partial plan view showing different contact positions of a pair of electrodes in the manufacturing process of FIG. 5. FIG. 6 is a partial plan view showing further different contact positions of a pair of electrodes in the manufacturing process of FIG. 5. The fragmentary top view which shows another contact position of a pair of electrode in the manufacturing process of FIG. The fragmentary top view which shows a different contact position of a pair of electrode in the manufacturing process of FIG. The partial top view which shows the contact position in the method of the comparative example similar to the past. The top view which shows the multi-piece wiring board by which the manufacturing method of the Example was given. The top view which shows the multi-piece wiring board by which the manufacturing method of the comparative example was given. The top view which shows the multi-cavity wiring board of the different form used as the object of this invention. The partial enlarged plan view which shows two wiring boards adjacent in FIG. Sectional drawing along the arrow of the VV line in FIG.

Hereinafter, modes for carrying out the present invention will be described.
FIG. 1 is a plan view showing a multi-piece base substrate 1 according to an embodiment of the present invention, FIG. 2 is an enlarged plan view of a one-dot chain line portion X in FIG. 1, and FIG. 3 is in FIG. It is sectional drawing along the arrow of the YY line.
The base substrate 1 is made of ceramic (insulating material) such as alumina, and as shown in FIGS. 1 to 3, in a plate-like substrate body 2 having a front surface 3 and a rear surface 4 that are square (rectangular) in plan view, A plurality of wiring boards 8 are arranged along the vertical and horizontal plane directions, each having an ear portion 5 positioned at a certain width along the four sides, and a front surface 3 and a rear surface 4 that are surrounded by these and are rectangular (rectangular) in plan view. And a product area 6. Hereinafter, the front surface 3 and the back surface 4 are used in common for the substrate body 2, the ear portion 5, and each wiring substrate 8.

As shown in FIGS. 2 and 3, the wiring substrate 8 has a cavity 9 that opens in a similar shape to a rectangular surface 3 of about 2 mm × 1 mm. The cavity 9 is composed of a bottom surface 10 having a rectangular shape in plan view and four side walls 11 surrounding the bottom surface 10, and ceramics are formed on inner corners at both ends of one short side (left side in the drawing) of the bottom surface 10. A pair of step portions 12 are formed, and a pair of connection terminals 13 are individually formed on the upper surfaces thereof. The pair of connection terminals 13 and electrodes of an electronic component (not shown) such as a crystal resonator which is inserted into the cavity 9 later are joined individually via a brazing material so that the electronic component is It is mounted on the pair of connection terminals 13.
In addition, between the wiring boards 8 and 8 and between the wiring board 8 and the ear portion 5, a dividing groove 7 having a substantially V-shaped cross section that opens toward the surface 3 is formed in a lattice frame shape in plan view. Between the groove 7 and the back surface 4, a planned cutting surface (virtual surface) cf for separating each wiring substrate 8 later is located. Further, an arbitrary number of wiring layers and via conductors (not shown) may be formed between the bottom surface 10 of the cavity 9 and the back surface 4 of the wiring substrate 8, and the connection terminals 13 are formed on the back surface 4 of the wiring substrate 8. An external terminal that is electrically connected to the terminal may be formed.
On the surface 3 of each wiring substrate 8, a metallized layer 14 having a rectangular (rectangular) frame shape in plan view is formed along each side. The metallized layer 14, the connection terminal 13, the wiring layer, and the via conductor are made of any of metals such as W, Mo, Cu, and Ag.

The base substrate 1 for multi-piece production as described above includes a ceramic component such as alumina, a flat green sheet having a required number of layers, and a green sheet having a required number of layers in which through holes such as rectangles are formed vertically and horizontally. And then fired and manufactured. A conductive paste containing W powder or the like is printed on the surface of any of the green sheets in advance, and between the wiring boards 8 and 8 and between the wiring board 8 and the ear portion 5 after the above-described stacking is performed by an inserted blade. The division grooves 7 are formed in a lattice shape.
As shown in FIG. 4, on the metallized layer 14 positioned on the surface 3 of the left wiring board 8 in the drawing, the planar view is already a rectangle (rectangle) similar to the metallized layer 14 and the entire bottom surface. A metal frame 16 on which the brazing material layer 15 is disposed is temporarily attached.
The metal frame (metal ring) 16 is made of, for example, 42 alloy (Fe-42% Ni), 194 alloy (Cu-2.3% Fe-0.03% P), or the like, For example, it is made of Sn—Au, silver solder, solder or the like.

On the metallized layer 14 located on the surface 3 of the wiring substrate 8 shown in the center in FIG. 4, as shown by a thick arrow in the figure, air is sucked into a ring mounter (not shown) whose posture is controlled in advance. The metal frame 16 with the brazing material layer 15 is positioned and placed. As a result, as shown in FIG. 5, the metal frame 16 with the brazing material layer 15 was placed on the metallized layer 14.
Next, a pair of roller electrodes (electrodes) 18 shown in FIGS. 5 and 6 were prepared. The roller electrode 18 is fixed to the ends of the pair of shafts 17 and is supported by a bearing portion 19 that is located between the shafts 17 and 17 and can be moved up and down and horizontally moved. That is, as shown by the one-dot chain line and two-dot chain line arrows in FIG. 6, the pair of roller electrodes 18 can approach (lower) and separate (up) the surface 3 of each wiring board 8, and It can be moved (horizontal) along the surface 3 of each wiring board 8.

In such a state, on the upper surface of the metal frame 16, positions that are not point-symmetric with respect to the center cp of the four sides constituting the metal frame 16, for example, near both ends of one long side as shown in FIG. After the lowermost portions of the pair of roller electrodes 18 are individually brought into contact (positions that are not point-symmetric with respect to the center cp of the four sides constituting the metal frame 16), a voltage is applied between the pair of roller electrodes 18 and 18. (About 75V) was applied.
The center of the long side, which is a position that bisects the contact positions of the pair of roller electrodes 18 and 18 by the current flowing between the electrodes 18 and 18 and is the most distant from each roller electrode 18 In the vicinity of the part, the maximum heat energy is locally generated. As a result, as shown in FIG. 7, in the vicinity of the central portion of the long side of the brazing material layer 15 having a lower melting point than the metal frame 16 and the metallized layer 14, only a part of the brazing material layer 15 is circular or elliptical. By melting into a shape and further solidifying by stopping the energization, a small brazed part bp was formed in one place. The metal frame 16 was temporarily fixed in a predetermined posture on the metallized layer 14 only through the one brazing part bp (temporary attaching step).
The temporary attachment process is sequentially performed on the plurality of wiring boards 8 by moving the pair of roller electrodes 18 to the adjacent wiring boards 8.

FIG. 8 is a partial plan view showing different contact positions of the pair of roller electrodes 18.
Similarly to the above, on the upper surface of the metal frame 16 with the brazing material layer 15 placed on the metallized layer 14 of the wiring substrate 8, as shown in FIG. The lowermost portions of the pair of roller electrodes 18 were brought into contact with each other (positions that were not point-symmetric with respect to the center cp of the four sides constituting the metal frame 16).
As a result, one brazing part bp similar to the above is formed in the vicinity of the central part of the long side of the brazing material layer 15 that is an intermediate position between the pair of roller electrodes 18, 18, so that the metal frame 16 is metallized. Temporarily fixed to the upper surface of the layer 14.

FIG. 9 is a partial plan view showing further different contact positions of the pair of roller electrodes 18.
Similarly to the above, on the upper surface of the metal frame 16 with the brazing material layer 15 placed on the metallized layer 14 of the wiring board 8, as shown in FIG. And a position in the vicinity of the corner portion between the long sides sandwiched between these two short sides (positions that are not point-symmetric with respect to the center cp of the four sides constituting the metal frame 16) While the lowermost portion of the roller electrode 18 was in contact, the same voltage as described above was applied to energize.
As a result, one (one) brazing portion bp similar to the above was formed at an intermediate position slightly on the left side of the long side of the brazing material layer 15 that is an intermediate position between the pair of roller electrodes 18 and 18. Thus, the metal frame 16 was temporarily fixed to the upper surface of the metallized layer 14.

FIG. 10 is a partial plan view showing different contact positions of the pair of roller electrodes 18.
Similarly to the above, on the upper surface of the metal frame 16 with the brazing material layer 15 placed on the metallized layer 14 of the wiring board 8, as shown in FIG. In a state where the lowermost portions of the pair of roller electrodes 18 are in contact with an intermediate position of the long side adjacent to the short side (a position that is not point-symmetric with respect to the center cp of the four sides constituting the metal frame 16), The same voltage as above was applied and energized.
As a result, one brazing portion bp similar to the above is formed at a position near the corner between the short side and the long side of the brazing material layer 15 which is an intermediate position between the pair of roller electrodes 18 and 18. As a result, the metal frame 16 was temporarily fixed to the upper surface of the metallized layer 14.

FIG. 11 is a partial plan view showing another contact position of the pair of roller electrodes 18.
Similarly to the above, on the upper surface of the metal frame 16 with the brazing material layer 15 placed on the metallized layer 14 of the wiring board 8, as shown in FIG. Energization is performed by applying the same voltage as described above in a state where the lowermost portions of the pair of roller electrodes 18 are brought into contact with nearby positions (positions that are not point-symmetric with respect to the center cp of the four sides constituting the metal frame 16). did.
As a result, one brazing part bp similar to the above is formed in the vicinity of the central part of the short side of the brazing material layer 15 which is an intermediate position between the pair of roller electrodes 18, 18. A metal frame 16 was temporarily fixed to the upper surface of the metallized layer 14.

According to the tacking process as described above, the current between the pair of roller electrodes 18 and 18 is substantially divided into two parts between the contact positions of the pair of roller electrodes 18 and 18 in the brazing material layer 15. The brazing material layer 15 is located farthest from each roller electrode 18 and is asymmetric with respect to the center cp of the four sides constituting the rectangle of the metal frame 16, brazing material layer 15, and metallization layer 14. One local (one place) brazed part bp melted and solidified could be formed. Since the metallization layer 14 and the metal frame 16 for each wiring board 8 can be temporarily fixed via the brazing part bp, the conventional method of temporarily attaching at two or more point-symmetrical positions can be used. In comparison, the stress generated in each metal frame 16 and the substrate body 2 due to the solidification of the brazing material is reduced, the metal frame 16 is thermally deformed, the substrate body 2 and the base substrate 1 are warped, and cracks are generated. Defects could be reduced.
Accordingly, since a flat metal lid (not shown) for sealing can be reliably bonded to the metal frame 16 with high airtightness, it is possible to efficiently manufacture the wiring substrate 8 having high sealing performance. It became.

Here, specific examples of the present invention will be described together with comparative examples.
It is mainly made of alumina, and the front and back surfaces 3 and 4 having a plan view of 2 mm × 1.4 mm, and the wiring board 8 having the same size cavity 9 is arranged vertically 9 × 6 horizontally along the plane direction. Twenty multi-base substrates (1) having a product region 6 and including four ears 5 and having a square shape of 20 mm on one side in a plan view and a thickness of 0.6 mm were manufactured.
Among these, the same metal frame 16 with the brazing layer material 15 made of 42 alloy is placed on the metallized layer 14 for each of the wiring substrates 8 in the ten base substrates 1, and the pair of roller electrodes 18 are connected to the pair of roller electrodes 18 shown in FIG. Each position shown in Fig. 1 was contacted and energized. As a result, only one spot-like brazing part bp was provided on the brazing material layer 15 immediately below the center of one long side of the metal frame 16 to perform the temporary attachment process. A plan view of the base substrate 1 after the temporary attachment is shown in FIG. A set of these ten base substrates 1 was taken as an example.

  On the other hand, the same metal frame 16 is also placed on the metallized layer 14 for each wiring board 8z in the remaining 10 base substrates 1z, and the same pair of roller electrodes 18 as shown in FIG. In the vicinity of the center of the pair of short sides facing each other in the frame 16, the same current as that described above was applied in contact with the center cp of the metal frame 16 in point symmetry. The current flows in parallel between two upper and lower paths separating the pair of electrodes 18 among the four sides constituting the metal frame 16, and the maximum thermal energy is obtained at an intermediate position that bisects these paths. occured. As a result, as shown in FIG. 12, the temporary attachment process was performed by providing two dotted brazing portions bp for each brazing material layer 15 immediately below the center of the pair of long sides of the metal frame 16. . A plan view of the base substrate 1z after the temporary attachment is shown in FIG. A set of these ten base substrates 1z was used as a comparative example.

The amount of warpage due to the tacking step was measured for all of the 20 base substrates 1 and 1z for each set of Examples and Comparative Examples. That is, the individual base substrates 1 and 1z were placed on the surface plate with the recessed surface 3 side having a substantially concave cross section facing upward, and the distance most deviated in the thickness direction was measured as the amount of warpage. Then, 10 average values of the example and 10 average values of the comparative example were calculated from the warpage amount.
As a result, the average value of the amount of warpage in the example was 363 μm.
On the other hand, the average value of the amount of warpage in the comparative example was 734 μm.
In other words, the warpage amount of the base substrate 1 of the example was 50% or less of the warpage amount of the base substrate 1z of the comparative example.
According to the results of the embodiment as described above, by using the temporary attachment process of the present invention, a single point (circle) brazing portion formed by a current supplied between the pair of roller electrodes 18 and 18 is used. Since the stress caused by bp could be suppressed, it is estimated that the amount of warpage can be almost halved compared to the comparative example. Furthermore, it is estimated that the thermal deformation of the metal frame 16 for each wiring board 8 is also reduced by suppressing the stress.
Therefore, it can be understood that the superiority of the present invention is supported by the above embodiment.

FIG. 15 is a plan view schematically showing a multi-piece base substrate 20 of a different form to which the present invention is applied, and FIG. 16 is an enlarged view showing two adjacent wiring boards 28 provided in the base substrate 20. 17 is a cross-sectional view taken along the line VV in FIG.
The base substrate 20 is made of an epoxy-based resin (insulating material) and, as shown in FIGS. 15 to 17, in a plate-like substrate body 22 having a front surface 23 and a rear surface 24 that are square (rectangular) in plan view. A plurality of wiring boards 28 having a front surface 23 and a rear surface 24 which are surrounded by the edge portions 25 having a constant width along the four sides and are rectangular (rectangular) in plan view are arranged along the vertical and horizontal plane directions. Product area 26.
In the following description, the front surface 23 and the back surface 24 are used in common for the substrate body 22, the ear portion 25, and each wiring substrate 28.

Each wiring board 28 is surrounded by a rectangular (rectangular) planned cutting surface (virtual surface) cf in plan view and is adjacent to the planned cutting surface cf, as indicated by a broken line in FIGS. A space is formed between the substrates 28 or the ears 25.
As shown in FIGS. 16 and 17, the wiring substrate 28 has a flat surface 23, a metallized layer 34 having a similar shape in plan view along the four sides of the surface 23, and an inner side of the metallized layer 34. In addition, a convex portion 30 having a rectangular shape in plan view formed at a position close to the short side on the right side thereof, and a pair of connection terminals 32 formed on both ends of the upper surface of the convex portion 30 are provided. On the pair of connection terminals 32, electrodes of an electronic component (not shown) such as a crystal resonator are brazed, and the electronic component is supported and mounted in a cantilever manner. The metallized layer 34 and the connection terminal 32 are made of Cu, Ag, or the like.

16 and 17, a metal frame 36 with a brazing material layer 35 having the same shape as that of the metallized layer 34 is already fixed on the upper surface of the metallized layer 34, as shown on the left side wiring board 28. Yes. That is, as shown in FIG. 16, a pair of roller electrodes 18 similar to the above are brought into contact with two positions on the upper surface of the metal frame 36 that is asymmetric with respect to the center cp of the four sides of the metal frame 36, and the electrodes 18. The metal frame 36 is fixed to the metallized layer 34 by temporary attachment by forming a small brazing part bp in a part of the brazing material layer 35 by performing a temporary attachment process in which a current is applied between the metallized layers 34. ing.
Also for the right side wiring board 28 in FIG. 17, a metal frame 36 having a brazing material layer 35 formed on the entire bottom surface is placed on the metallized layer 34 as shown by the arrows in FIG. By performing the temporary attachment step, the metal frame 36 can be temporarily fixed on the metallized layer 34.

In the temporary attachment step for fixing the metal frame 36 on the metallized layer 34 of the wiring board 28, the positions where the lowermost portions of the pair of electrodes 18 are brought into contact with the two positions on the upper surface of the metal frame 36 are as shown in FIG. Any of the positions shown in FIG. 11 may be selected.
Then, the base substrate 20 that has been subjected to the temporary attachment process for all the wiring boards 28 is inserted into a heating furnace (not shown), and the entire brazing material layer 35 for each wiring board 28 is melted and solidified. When the attaching process was performed, problems such as the base substrate 20 being warped and the metal frame 36 being thermally deformed could be reduced. Accordingly, since a box-shaped metal lid (not shown) for sealing can be reliably bonded to the metal frame 36 with high airtightness, it is possible to efficiently manufacture the wiring board 28 with high sealing performance. It became.

The present invention is not limited to the above embodiments and examples.
For example, the insulating material constituting the substrate bodies 2 and 22 of the base substrates 1 and 20 may be a high-temperature fired ceramic such as aluminum nitride or mullite, a low-temperature fired ceramic such as glass-ceramic, or a resin other than epoxy. good.
Further, the front surfaces 3 and 23 and the back surfaces 4 and 24 of the wiring boards 8 and 28 may have a square shape or a substantially square rectangle in plan view, and according to this, the metallized layers 14 and 34 and the brazing material layer 15 and 35 and the metal frames 16 and 36 are also square or substantially square in plan view.
Further, the pair of electrodes may be in the form of a pin that can be moved up and down.
In addition, the electronic component mounted in the cavity 9 of the wiring board 8 or on the surface 23 of the wiring board 28 may be a piezoelectric element, a semiconductor integrated circuit, a SAW filter, a high frequency switch module, or the like.

  According to the present invention, in the method for manufacturing a wiring board by multi-cavity, when the metal frame is temporarily attached on the rectangular metal layer in plan view formed on the surface of each wiring board, the deformation of the metal frame, It is possible to reliably reduce warpage and cracks in the base substrate and the wiring substrate for multi-piece production.

DESCRIPTION OF SYMBOLS 1,20 ... Base substrate 3,23 ... Front surface 4, 24 ... Back surface 8, 28 ... Wiring substrate 14, 34 ... Metallized layer 15, 35 ... Brazing material layer 16, 36 ... Metal frame 18 ......... Roller electrode cp ………… Center bp ………… Brass (part of brazing material layer)

Claims (5)

In a multi-piece base substrate that is made of an insulating material and has a plurality of wiring boards arranged in a vertical and horizontal plane direction having a rectangular front surface and back surface in a plan view,
A metal frame having a rectangular shape in plan view and a brazing material layer disposed on the bottom surface is placed on the metallized layer in a plan view formed along each side of the surface of each wiring board. Temporarily attaching the metal frame to the surface of the wiring board by individually contacting and energizing a pair of electrodes at two locations on the upper surface of the metal frame to melt and solidify only a part of the brazing material layer A method of manufacturing a wiring board including steps,
In the tacking step, the pair of electrodes are energized while individually contacting two positions that are not point-symmetric with respect to the center of the four sides of the four sides constituting the metal frame in plan view. To be
A method for manufacturing a wiring board. In the tacking step, the pair of electrodes is in contact with the vicinity of both ends of any one of the four sides constituting the metal frame in plan view, or at a position between the adjacent pair of sides. Energized in contact,
The method for manufacturing a wiring board according to claim 1. In the tacking step, the pair of electrodes are in contact with an intermediate position of one side of the pair of adjacent sides of the metal frame in plan view and an end portion on the other side and away from the one side. Energized in a state,
The method for manufacturing a wiring board according to claim 1. The surfaces of the plurality of wiring boards are rectangular in plan view, and in the tacking step, the pair of electrodes are in the longitudinal direction for each pair of opposing short sides among the four sides constituting the metal frame in plan view. Energized in a state of individual contact with different positions except near the center of
The method for manufacturing a wiring board according to any one of claims 1 to 3, wherein The pair of electrodes used in the tacking step is a pair of roller electrodes that can be moved toward and away from the surfaces of the plurality of wiring boards and can be moved along the surfaces of the wiring boards.
The method for manufacturing a wiring board according to any one of claims 1 to 4, wherein:

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