Source: https://patents.google.com/patent/WO2016143317A1/en
Timestamp: 2020-01-18 19:43:50
Document Index: 165709282

Matched Legal Cases: ['Application No. 2015', 'art 400', 'art 400', 'art 400', 'art 400', 'art 400', 'art 400', 'art 410']

WO2016143317A1 - Electronic device and manufacturing method thereof - Google Patents
WO2016143317A1
WO2016143317A1 PCT/JP2016/001203 JP2016001203W WO2016143317A1 WO 2016143317 A1 WO2016143317 A1 WO 2016143317A1 JP 2016001203 W JP2016001203 W JP 2016001203W WO 2016143317 A1 WO2016143317 A1 WO 2016143317A1
PCT/JP2016/001203
2015-03-12 Priority to JP2015-049820 priority Critical
2015-03-12 Priority to JP2015049820A priority patent/JP6365360B2/en
2016-03-04 Application filed by 株式会社デンソー filed Critical 株式会社デンソー
2016-09-15 Publication of WO2016143317A1 publication Critical patent/WO2016143317A1/en
229920000642 polymers Polymers 0 abstract claims description 182
239000011347 resins Substances 0 abstract claims description 182
230000001681 protective Effects 0 claims description 77
238000000465 moulding Methods 0 claims description 55
An electronic device (100) according to the present invention has circuit elements (21, 22) mounted on a circuit board (10), and the mount surface, the circuit elements (21, 22), etc., are sealed by a mold resin (30). In addition, a dummy wiring (40) is provided on the mount surface of the circuit board (10) along the edges of the mold resin (30), and astride the inside and outside of the mold resin (30). Still further, a protection resin (50) is provided on the dummy wiring (40). The protection resin (50) is provided astride the inside and outside of the mold resin (30), and a portion thereof disposed outside the mold resin (30) covers the dummy wiring (40) without being in contact with the circuit board (10). Consequently, according to the electronic device (100), it is possible to suppress the protection resin (50) from cracking.
Electronic device and manufacturing method thereof Cross-reference of related applications
This application is based on Japanese Application No. 2015-49820 filed on Mar. 12, 2015, the contents of which are incorporated herein by reference.
The present disclosure relates to an electronic device in which a circuit board on which electronic components are mounted is sealed with a mold resin, and a manufacturing method thereof.
Conventionally, there is a mold package disclosed in Patent Document 1 as an example of the electronic device as described above. In the mold package, a resin film (hereinafter referred to as a protective resin) is provided between one surface of the circuit board and an end portion of the mold resin as an integrated material for covering the wiring. This protective resin includes a portion that is crushed by a mold during the molding process.
Incidentally, in the mold package, a protective resin is provided over the circuit board and the wiring outside the mold resin. That is, the protective resin includes a portion disposed on the wiring and a portion disposed on the circuit board without being disposed on the wiring outside the mold resin. For this reason, a difference arises in the amount of expansion and contraction between the two parts of the protective resin due to a change in ambient temperature. Therefore, the protective resin may cause cracks due to stress concentration due to the difference in the amount of expansion / contraction between the two parts.
This disclosure is intended to provide an electronic device that can suppress the occurrence of cracks in a protective resin, and a method for manufacturing the same.
According to the first aspect of the present disclosure, an electronic device is mounted on a circuit board having an insulating base and wiring provided on the insulating base, and is electrically connected to the wiring. A mold resin that seals the circuit element, the circuit element, and a mounting surface of the circuit board on which the circuit element is mounted, and is provided on the mounting surface of the circuit board, along the edge of the mold resin And a dummy wiring provided over the inside and outside of the mold resin, and a protective resin provided on the dummy wiring. The protective resin is provided between the inside and the outside of the mold resin, and the portion arranged outside the mold resin covers the dummy wiring without touching the circuit board.
Thus, according to the first aspect of the present disclosure, the protective resin covers the dummy wiring outside the mold resin without touching the circuit board. For this reason, in the protective resin provided outside the mold resin, it is possible to reduce the portion where the difference in expansion and contraction occurs. Therefore, it can suppress that a crack generate | occur | produces in protective resin.
According to the second aspect of the present disclosure, a method for manufacturing an electronic device includes a circuit board having an insulating base and wiring provided on the insulating base, and mounted on the circuit board and electrically connected to the wiring. And a dummy wiring provided inside and outside the formation region along the edge of the molding resin formation region on the mounting surface of the circuit board on which the circuit element is mounted. Prepare a structure, and form protective resin on the dummy wiring so that it covers the inside and outside of the forming area and does not touch the circuit board at the part arranged outside the forming area. And a molding die having a cavity corresponding to the outer shape of the mold resin, by molding the mold resin in a state where the cavity faces the mounting surface in the structure in which the protective resin is formed. , Mounting surface, Comprising a to seal a portion of the protection resin. In the sealing, the molding resin is molded in a state in which the outside of the formation region of the protective resin is crushed by the pressing portion that holds down the mounting surface side of the structure on which the protective resin is formed in the mold.
Thus, according to the second aspect of the present disclosure, when the protective resin is formed on the dummy wiring over the inside and the outside of the formation region where the mold resin is formed, The part arranged outside is formed without touching the circuit board. Then, with the pressing part that holds down the mounting surface side of the structure in which the protective resin is formed in the mold, the molding resin is molded in a state in which the outside of the forming region where the molding resin is formed is crushed. Do. For this reason, in the protective resin provided outside the mold resin, it is possible to reduce the portion where the difference in expansion and contraction occurs. Therefore, it is possible to manufacture an electronic device in which cracks are unlikely to occur in the protective resin.
The above and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings.
Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, portions corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals and redundant description may be omitted. In each embodiment, when only a part of the configuration is described, the other configurations described above can be applied to other portions of the configuration.
The circuit board 10 has an insulating base 11 and wiring provided on the insulating base 11. The circuit board 10 has a semiconductor element 21 and a passive element 22 mounted on one surface. Therefore, it can be said that one surface of the circuit board 10 is a mounting surface S1. The circuit board 10 can employ a printed circuit board composed mainly of a resin such as an epoxy resin or a glass epoxy resin as the insulating base material 11, or a ceramic board composed mainly of ceramics as the insulating base material 11. The circuit board 10 can employ a through-hole board or a build-up board. The wiring is composed mainly of a metal such as copper. Although not shown in FIG. 2, the wiring is a wiring normally used for a circuit board. For example, a configuration as shown in FIG. 9 may be adopted.
The semiconductor element 21 and the passive element 22 are mounted on the mounting surface S1 and correspond to circuit elements. The semiconductor element 21 and the passive element 22 are electrically connected to the wiring of the circuit board 10 via a conductive adhesive member such as solder. The semiconductor element 21 is a MOSFET, a microcomputer, a control element, or the like. The passive element 22 is a chip resistor, a chip capacitor, a crystal resonator, or the like. However, the semiconductor element 21 and the passive element 22 are not limited to these, and any circuit element that is electrically connected to the wiring of the circuit board 10 can be employed.
The mold resin 30 may be a thermosetting epoxy resin, for example. Further, the mold resin 30 can be used even if the epoxy resin contains a filler such as alumina or silica in an epoxy resin as necessary. The mold resin 30 is formed by a transfer molding method, a compression molding method, or the like in a molding process described later.
The dummy wiring 40 is a part that is pressed by the mold clamping unit 400 during the molding process described later. The dummy wiring 40 is formed mainly of a metal such as copper and is provided on the mounting surface S1. The dummy wiring 40 is provided across the inside and outside of the mold resin 30 along the edge (in other words, the side wall) of the mold resin 30. In the present embodiment, two dummy wirings 40 that are provided along two opposite sides of the circuit board 10 and along the other two opposite sides are employed. Further, it can be said that the dummy wiring 40 includes a portion disposed in a region surrounded by a virtual plane along the side wall of the mold resin 30 and a portion provided outside the region.
The protective resin 50 is a resin for preventing the mold resin from leaking due to a gap between the circuit board 10 and the clamp part 400 of the mold during the molding process. In other words, the protective resin 50 is a resin for increasing the area facing the clamp unit 400.
The portion of the protective resin 50 covered with the mold resin 30 may be formed on the shoulder portion of the dummy wiring 40 and may be in contact with the circuit board 10. Since the portion of the protective resin 50 covered with the mold resin 30 is covered with the mold resin 30, stress concentrates on the interface between the portion in contact with the circuit board 10 and the portion on the dummy wiring 40. Can be suppressed. Therefore, the electronic device 100 can secure an area in contact with the clamp part 400 while suppressing the generation of cracks in the protective resin 50 in the mold resin 30.
The protective resin 50 can employ, for example, an insulating solder resist. The circuit board 10 may have a solder resist formed around a solder connection portion such as the semiconductor element 21. In the electronic device 100 in this case, the solder resist and the protective resin 50 provided around the solder connection portion and the like can be formed simultaneously. However, the protective resin 50 is not limited to this, and may be a resin such as polyimide, acrylic resin, or epoxy resin that is different from the solder resist provided around the solder connection portion or the like.
The dummy wiring 40 and the protective resin 50 are portions that are pressed by the mold clamping unit 400 in the molding process described later, and can be said to be a mold stepping unit. Regarding this type stepping portion, refer to Japanese Unexamined Patent Application Publication No. 2014-220305 (WO 2014-181509 A1). The dummy wiring 40 and the protective resin 50 may be provided along the outline of the mold resin 30.
In the electronic device 100, a part of the circuit board 10 is exposed from the mold resin 30 as shown in FIG. The part exposed from the mold resin 30 in the circuit board 10 can be said to be an ear part. Therefore, in the electronic device 100, a through hole may be formed in the ear portion. The through hole is a through hole that penetrates the circuit board 10 in the thickness direction and is covered with a conductor that is a part of the wiring, and is a connection portion used for electrical connection.
Next, a method for manufacturing the electronic device 100 according to the present embodiment will be described with reference to FIGS. In this manufacturing method, a circuit board 10 in a multiple state in which a plurality of circuit boards 10 in the electronic device 100 are integrally connected is used. In this manufacturing method, the semiconductor element 21 and the passive element 22 are mounted on the circuit board 10 in a multiple state, and after the molding resin 30 is molded, the circuit board 10 is cut together with the molding resin 30 so that each electron The device 100 is divided into pieces. That is, this manufacturing method employs so-called Mold Array Package (MAP) molding. However, the manufacturing method can be applied even when one circuit board 10 in the electronic device 100 is used. Moreover, in FIG.3, FIG.4, FIG.6, the code | symbol of the component after individualization is provided to each component before individualization.
First, the manufacturing method performs a preparation process for preparing the first pre-mold structure 200a shown in FIG. The first pre-mold structure 200a corresponds to a first structure. The first pre-mold structure 200 a includes a circuit board 10, a semiconductor element 21, a passive element 22, and a dummy wiring 40.
The circuit board 10 has an insulating base material 11 and wiring provided on the insulating base material 11, and is in a multiple state in which the circuit boards 10 in the three electronic devices 100 are integrated. The semiconductor element 21 and the passive element 22 are mounted for each region where the electronic device 100 is formed on the circuit board 10 by reflow soldering or the like. And the dummy wiring 40 is provided over the inside and outside of a formation area along the edge part of the formation area of the mold resin 30 in the mounting surface S1 of the circuit board 10 by patterning a conductor layer. Further, as shown in FIG. 3, the dummy wiring 40 is formed in an annular shape in the state of the first pre-mold structure 200a.
Next, the manufacturing method performs a protective resin forming step for forming the second pre-mold structure 200b shown in FIG. In the protective resin forming step, the protective resin 50 is formed on the dummy wiring 40 in the first pre-molding structure 200a by the well-known solder resist forming method or the like over the inside and outside of the molding resin 30 forming region. Further, as shown in FIG. 4, the protective resin 50 is formed in an annular shape in the state of the second pre-mold structure 200b.
In the protective resin forming step, the protective resin 50 is formed without touching the circuit board 10 with a portion of the protective resin 50 arranged outside the formation region. In the protective resin forming step, the second pre-mold structure 200b is thus formed. The second pre-mold structure 200b is the first pre-mold structure 200a on which the protective resin 50 is formed.
Thus, in this manufacturing method, the second pre-mold structure 200b can be manufactured by performing the preparation process and the protective resin formation process. This preparation process and protective resin formation process can be said to be a substrate manufacturing process with respect to the molding process described later. That is, in this manufacturing method, a preparation process and a protective resin formation process can be collectively called a substrate manufacturing process.
Then, this manufacturing method performs the molding process shown in FIG. Here, the compression molding method is adopted. However, the present embodiment can be adopted even with the transfer mold method.
In the molding process, molding dies 400 and 410 having cavities corresponding to the outer shape of the mold resin 30 are used. The mold 400 is a clamp portion that holds down the second pre-mold structure 200b. The mold 410 is a movable part that compresses the constituent material of the mold resin 30 disposed in the cavity. The clamp part 400 corresponds to a pressing part. Further, the clamp part 400 is a part that holds down the mounting surface S1 side of the first pre-mold structure 200a.
As described above, the electronic device 100 covers the dummy wiring 40 without the protective resin 50 touching the circuit board 10 outside the mold resin 30. For this reason, the electronic device 100 can reduce the part where the difference in expansion / contraction amount occurs in the protective resin 50 provided outside the mold resin 30. Therefore, the electronic device 100 can suppress the generation of cracks in the protective resin 50. In other words, even when the electronic device 100 is used in a cold environment, the protective resin 50 is less likely to cause a difference in expansion and contraction and can suppress the occurrence of cracks. The cold environment is an environment that repeatedly changes, for example, at a low temperature such as below freezing and at a high temperature exceeding 100 degrees.
For example, when the protective resin is provided on the circuit board and the surface conductor outside the mold resin, cracks may occur as described above. In this case, in the electronic device, it is conceivable that stress is applied to the circuit board due to the occurrence of cracks in the protective resin. However, since the electronic device 100 can suppress the generation of cracks in the protective resin 50, it is possible to suppress the application of stress to the circuit board 10 due to the cracks in the protective resin 50.
As described above, in the present manufacturing method, when the protective resin 50 is formed on the dummy wiring 40 over the inside and outside of the formation region of the mold resin 30, the protection resin 50 is disposed outside the formation region. The protective resin 50 is formed without touching the circuit board 10. Then, in the present manufacturing method, the mold resin 30 is molded in the state in which the outside of the formation region of the mold resin 30 in the protective resin 50 is crushed by the clamp portion 400. For this reason, this manufacturing method can reduce the site | part in which the difference in expansion-contraction amount arises in the protective resin 50 provided in the exterior of the mold resin 30. FIG. Therefore, this manufacturing method can manufacture the electronic device 100 in which the occurrence of cracks in the protective resin 50 is suppressed.
The embodiment of the present disclosure has been described above. However, the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure. Hereinafter, modifications 1 and 2 of the present disclosure will be described. The above-described embodiment and Modifications 1 and 2 can be implemented independently, but can also be implemented in appropriate combination. The present disclosure is not limited to the combinations shown in the embodiments, and can be implemented by various combinations.
With reference to FIGS. 7 and 8, an electronic device 100 a according to Modification 1 and a method for manufacturing the same will be described. The electronic device 100a differs from the electronic device 100 in the shapes of the mold resin 30a and the protective resin 50a.
As shown in FIG. 7, the mold resin 30a includes on the dummy wiring 40 a first tapered portion 31a that becomes wider as the dummy wiring 40 is approached. The protective resin 50a includes a second tapered portion 51a that is inclined along the first tapered portion 31a. Such a shape is formed in the clamp part 400a used when performing a molding process.
In the manufacturing method of this modification, as shown in FIG. 8, a clamp part 400a and a movable part 410a, which are molds, are used. In particular, the clamp portion 400a has a die taper portion 401a that is inclined so that the opening area of the cavity becomes wider as the dummy wiring 40 is approached.
The electronic device 100b according to the second modification will be described with reference to FIG. The electronic device 100b is different from the electronic device 100 in the configuration of the circuit board 10a.
The inner layer pattern 12 and the interlayer connection portion 13 correspond to inner layer wiring. The inner layer pattern 12 is provided in the insulating base material 11 so as to intersect with the dummy wiring 40 via the insulating base material 11. The inner layer pattern 12 is electrically and mechanically connected to the interlayer connection portion 13. The interlayer connection portion 13 is electrically and mechanically connected to the first surface wiring 14 and is electrically and mechanically connected to the second surface wiring 15.
A circuit board (10, 10a) having an insulating base (11) and wirings (12 to 15) provided on the insulating base;
The electronic device in which the protective resin is provided over the inside and outside of the mold resin, and a portion disposed outside the mold resin covers the dummy wiring without touching the circuit board.
The circuit board (10a) is used as the wiring (12 to 15).
A circuit board (10, 10a) having an insulating base (11) and wirings (12 to 15) provided on the insulating base, and a circuit mounted on the circuit board and electrically connected to the wiring It is provided over the inside and outside of the formation region along the edge of the formation region of the mold resin (30, 30a) on the mounting surface of the element (21, 22) and the circuit element on the circuit board. Preparing a first structure (200a) having a dummy wiring (40),
A protective resin (50, 50a) is formed on the dummy wiring so as to extend from the inside of the formation region to the outside and so that a portion disposed outside the formation region does not touch the circuit board. And
A molding die (400, 410, 400a, 410a) having a cavity corresponding to the outer shape of the mold resin is made to face the mounting surface of the first structure on which the protective resin is formed. Sealing the circuit element, the mounting surface, and a part of the protective resin by molding the mold resin in a state,
In the sealing, a pressing portion (400, 400a) that holds down the mounting surface side of the first structure on which the protective resin is formed in the mold, the outside of the formation region of the protective resin is formed. A method for manufacturing an electronic device, wherein the molding resin is molded in a crushed state.
The said pressing part (400a) in the said metal mold | die (400a, 410a) has the metal mold | die taper part (401a) inclined so that the opening area of the said cavity may become large as it approaches the said dummy wiring. The manufacturing method of the electronic device as described in any one of.
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JP2015-049820 2015-03-12
WO2016143317A1 true WO2016143317A1 (en) 2016-09-15
JP6520889B2 (en) * 2016-11-01 2019-05-29 株式会社デンソー Electronic device
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US8106521B2 (en) 2012-01-31 Semiconductor device mounted structure with an underfill sealing-bonding resin with voids
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