JP5428486B2 - Shield mounting board and shield board mounting method - Google Patents

Description

  The present invention relates to a shield mounting board and a shield board mounting method, and more particularly to a shield mounting board and a shield board mounting method for mounting a plurality of shield cases on a printed circuit board in which a component mounting area for mounting a shield case is limited.

  Conventionally, when a receiver having a communication function is mounted, in order to block unnecessary noise from surrounding components, for example, as disclosed in Japanese Patent Application Laid-Open No. 2003-209386, “Shield case structure of high-frequency components”. The receiver is mounted with a shield case on the receiver.

  As shown in FIG. 9, the basic shape of the shield case is a lunch box shape in which four sides of a single plate are bent to form a four-side wall as shown in FIG. Therefore, when the shield case is made, if the walls on the four sides are not straight, a cutout hole is generated in the shield case. FIG. 9 is a schematic diagram for explaining a bent portion of a metal plate for forming a conventional shield case, and FIG. 10 shows a basic structure of a conventional lunch box-shaped shield case having four side walls. It is a schematic diagram for demonstrating.

  Further, the shield case can be made of a complicated shape by metal welding in addition to the case made by cutting out from a single sheet metal as in the shape of a lunch box in FIG. However, the more complicated the shape is, the higher the processing cost becomes, leading to an increase in cost.

  In the case of a miniaturized device such as a mobile phone, the component mounting area of the printed circuit board is small, and the area for mounting a shield case for preventing noise is limited. For this reason, in the case of a printed circuit board that needs to mount two box-shaped metal shield cases with four side walls, it may not be possible to mount the two metal shield cases in a limited space. Alternatively, in order to forcibly secure the mounting area, a notch is formed in the wall of one of the shield cases 1A and 2A (the shield case of the shield 1A in the example of FIG. 11) as shown in FIG. In some cases, two shield cases are mounted. FIG. 11 is a schematic diagram showing the shape of a shield case when two metal shield cases having four side walls are mounted on a substrate.

JP 2003-209386 A (page 2-3)

  However, as shown in FIG. 11, when a notch is formed on the wall of one of the shield cases (the shield case of the shield 1A in the example of FIG. 11) in order to mount two shield cases, As a result of forming the notch in the wall, there is a risk that noise may enter the components in the shield case from the hole in which the notch is formed, and cause deterioration of electrical characteristics such as a communication function. The risk increases as the amount of cutout increases. Also, if the electrical characteristics such as the communication function cannot be secured, it is necessary to change the land formation position for mounting the shield case when trying to change the shield case to be cut out. Thus, there arises a problem that the printed circuit board needs to be revised.

  SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a shield mounting board and a shield board in which a plurality of shield cases are mounted with a simple shield case structure, and no revision of the printed board is required even when the notch is changed. Provide an implementation method.

  In order to solve the above-described problems, the shield mounting board and the shield board mounting method according to the present invention employ the following characteristic configuration. The numbers (1) and (4) below correspond to the item numbers in the claims.

(1) In a shield mounting board on which a plurality of shield cases are mounted on a printed board, any one or a plurality of shield cases among the plurality of shield cases is formed as a cutout shield case. When mounted on the printed circuit board, the one side of the cutout shield case having the cutout and the one side of the cutout shield case having the cutout are arranged as opposing shield cases. A shield mounting board in which one side of a plurality of other shield cases is arranged on the same straight line.
(4) In a shield board mounting method for mounting a plurality of shield cases on a printed circuit board, any one or a plurality of shield cases among the plurality of shield cases is formed as a cutout shield case in which a cutout is partially formed. Thus, when mounting on the printed circuit board, the one side of the cutout shield case having the cutout and the one side of the cutout shield case having the cutout are arranged as an opposing shield case 1. Or a shield substrate mounting method in which one side of a plurality of other shield cases is arranged on the same straight line.

  According to the shield mounting substrate and the shield substrate mounting method of the present invention, the following effects can be obtained.

  In a printed circuit board that mounts a plurality of metal shield cases having four side walls, if the mounting area of components on the printed circuit board is insufficient, a mounting space is secured by cutting out one of the shield cases. When arranging a plurality of shield cases on a printed circuit board, by arranging one of the four sides of each shield case so as to be aligned on the same straight line, the cutout amount of the shield case is minimized. It is possible to prevent the noise from entering the shield case.

  Also, by adopting the arrangement method of each shield case in which one of the four sides is aligned on the same straight line, the land on the printed circuit board can be arranged on the same straight line, and the shield to be cut out Even when the case is changed, the shield case to be cut out can be changed without the revision of the printed circuit board.

  Thus, the shield case to be cut out can be freely selected, and the risk at the time of countermeasure when the electrical characteristics deteriorate due to the noise to the circuit in the shield case can be reduced. Furthermore, since the shape of the shield case is not complicated, it is possible to produce the shield case at a low cost.

It is a schematic diagram which shows an example of the shielding board mounting method of this invention. It is a schematic diagram which shows an example of the shield mounting board | substrate of this invention. It is a schematic diagram which shows the example different from FIG. 1 of the shielding board mounting method of this invention. It is a schematic diagram which shows the example different from FIG. 2 of the shield mounting board | substrate of this invention. It is a schematic diagram which shows the example different from FIG. 1, FIG. 3 of the shield substrate mounting method of this invention. It is a schematic diagram which shows the example different from FIG. 2, FIG. 4 of the shield mounting board | substrate of this invention. It is a schematic diagram which shows the example different from FIG. 5 of the shielding board mounting method of this invention. It is a schematic diagram which shows the example different from FIG. 6 of the shield mounting board | substrate of this invention. It is a schematic diagram for demonstrating the bending part of the metal plate for forming the conventional shield case. It is a schematic diagram for demonstrating the basic structure of the lunch box-shaped shield case which formed the conventional 4 side wall. It is a schematic diagram which shows the shape of the shield case in the case of mounting two metal shield cases with four side walls on a substrate.

  Hereinafter, preferred embodiments of a shield mounting board and a shield board mounting method according to the present invention will be described with reference to the accompanying drawings.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, the features of the present invention will be described first. In the printed circuit board on which a plurality of metal shield cases having four side walls as described above with reference to FIG. 10 are mounted, if any mounting area of components on the printed circuit board is insufficient, any one of the shields is provided. A mounting space is secured by cutting out the case, and when arranging each of the plurality of shield cases on the printed circuit board, one of the four sides of each shield case is arranged so as to be aligned on the same straight line. As a result, the cutout amount of the shield case can be minimized, and noise can be prevented from entering the shield case.

  Also, by adopting the arrangement method of each shield case in which one of the four sides is aligned on the same straight line, the land on the printed circuit board can be arranged on the same straight line, and the shield to be cut out Even when the case is changed, the shield case to be cut out can be changed without the revision of the printed circuit board. Thus, the shield case to be cut out can be freely selected, and the risk at the time of countermeasure when the electrical characteristics deteriorate due to the noise to the circuit in the shield case can be reduced. Furthermore, since the shape of the shield case is not complicated, it is possible to produce the shield case at a low cost.

(Configuration example of embodiment)
Next, a configuration example of one embodiment of the present invention will be described. FIG. 1 is a schematic diagram showing an example of a shield board mounting method according to the present invention, showing a notch forming method and a method of arranging each shield case when two shield cases are mounted on a printed board. Yes.

  As shown in FIG. 1, when two shield cases of the first shield 1 and the second shield 2 are mounted on a printed board, the component mounting area of the printed board is limited. When mounting the case by forming a notch in the case, one side where the notch is formed in the first shield 1 serving as a notch shield case in which a notch is formed in a part of the four side walls, and the one side One side facing the one side where the cutout of the first shield 1 is formed out of the four sides of the second shield 2 which are arranged opposite to each other as a opposing shield case and has a complete four-side wall is the same straight line L By arranging the second shields 2 so as to be lined up, the second shield 2 is shielded by a complete wall, and the cutout amount of the first shield 1 on the other side can be minimized.

  When the shield case as shown in FIG. 1 is arranged, lands 3 and 4 for mounting the shield case as shown in FIG. 2 are formed on the printed circuit board, and two pieces of first and second shields 1 and 2 are formed. Will be equipped with a shield case. FIG. 2 is a schematic view showing an example of the shield mounting board of the present invention, and illustrates the formation positions of lands for mounting two shield cases shown in the shield board mounting method of FIG. As shown in FIG. 2, the land 3 for the first shield and the land 4 for the second shield have a complete four side wall with the land 3 on one side where the cutout of the first shield 1 is formed. The land 4 on the opposite side of the second shield 2 is also arranged on the same straight line L of the printed circuit board.

  As shown in FIG. 2, the same printed circuit board is used by forming lands 3 and 4 for mounting the two shield cases of the first shield 1 and the second shield 2 on the same straight line L of the printed circuit board. As shown in FIG. 3, the shield case forming the notch is reversed from the case of FIG. 1 and cut into one side of the first shield 5 having a complete four-side wall and a part of the four-side wall. It is also possible to arrange on the same straight line L the one side where the cutout of the second shield 6 formed with the cutout is formed. FIG. 3 is a schematic view showing an example different from FIG. 1 of the shield board mounting method of the present invention. The notch forming method and the arrangement of each shield case when two shield cases are mounted on a printed board. As for the method, an example is shown in which a notch is formed on one side of the shield case different from that in FIG. 1, that is, on the same straight line L of the second shield 6.

  When two shield cases of the first and second shields 5 and 6 as shown in FIG. 3 are arranged on the printed board, the land is placed on the printed board at the same position as in FIG. 2 as shown in FIG. It is possible to mount the two shield cases of the first and second shields 5 and 6 while keeping the state of forming 3 and 4. FIG. 4 is a schematic view showing an example of the shield mounting board of the present invention different from that of FIG. 2, and the land for mounting the two shield cases shown in the shield board mounting method of FIG. The same formation position is illustrated.

  Thus, in the method of mounting the shield case as shown in FIG. 1, when noise wraps around the circuit components in the first shield 1 in which the notch is formed and a problem occurs in electrical characteristics, As shown in FIG. 3, the printed circuit board is revised by forming a notch on the opposite side of the second shield 6 and using a shield case having a complete wall for the first shield 5. It is possible to prevent noise from entering the first shield 5 without changing the land position of the printed circuit board. As described above, by making it possible to mount any of the two types of shield cases on the same printed circuit board, it is possible to reduce the risk of quality degradation due to noise.

(Description of operation of embodiment)
The operation of the shield case mounting method of FIGS. 1 and 3 and the land layout of the shield case mounting printed circuit boards of FIGS. 2 and 4 will be further described. In the case where noise circulates to the circuit components in the first shield 1 in which the notch is formed as shown in FIG. 1 and a problem of electrical characteristics occurs, as described above, as shown in FIG. By making the shield case forming the second shield 6 side instead of the first shield 5 side, the first shield 5 can be changed to a shield structure covered with four side walls. Intrusion of noise into circuit components in one shield 5 can be completely blocked.

(Explanation of effect of embodiment)
As described above, in the present embodiment, the following effects can be obtained.

  In the above-described embodiment, in order to mount two bento box-shaped shield cases having four side walls on a printed circuit board having a limited mounting area, a cutout is made in a part of one shield case. In the mounting method that secures the mounting area of the two shield cases on the printed circuit board, noise wraps around the circuit parts in the shield case where the cutouts are formed, causing problems in electrical characteristics If this is the case, use the printed circuit board as it is, and instead of using the shield case, form a notch in the wall of a part of the other shield case. It is possible to form a complete four-side wall and prevent noise from entering the shield case. As a result, it is possible to reduce the risk of occurrence of problems in electrical characteristics without revision of the printed circuit board.

(Other embodiments of the present invention)
As another embodiment of the present invention, a method for mounting a shield case on a printed circuit board on which three shield cases are mounted will be described with reference to FIGS. In the embodiment described above, the case where two shield cases are mounted is described. Here, a case where three shield cases are mounted will be described. More generally, when mounting a plurality of shield cases, the same mounting method as that described here can be adopted.

  FIG. 5 is a schematic view showing an example different from FIGS. 1 and 3 of the shield board mounting method of the present invention. The notch forming method and each shield when three shield cases are mounted on a printed board. The case arrangement method is shown.

  As shown in FIG. 5, among the three shield cases of the first shield 7, the second shield 8, and the third shield 9, the first shield 7 and the third shield 9 at both ends are completely four. By forming a cutout in a part of the four side walls of the central second shield 8 sandwiched between the two shield cases of the first shield 7 and the third shield 9 as a shield case having side walls, Three shield cases of the first shield 7, the second shield 8, and the third shield 9 can be mounted on the printed circuit board.

  In such a case, as shown in FIG. 5, one side where the cutout is formed in the second shield 8 which is a cutout shield case in which a cutout is formed in a part of the four side walls, and the one side is opposed to the one side. 1 facing the one side where the cutout of the second shield 8 is formed among the four sides of the first shield 7 and the third shield 9 at both ends having a complete four-side wall. The sides are arranged on the same straight line L.

  By mounting the shield case in such an arrangement, the shield case mounting lands 10, 11, 12 as shown in FIG. 6 are formed on the printed circuit board, and the first, second, second Three shield cases of three shields 7, 8, and 9 are mounted. FIG. 6 is a schematic diagram showing an example of the shield mounting board of the present invention different from FIGS. 2 and 4, and the land formation positions for mounting three shield cases shown in the shield board mounting method of FIG. Is illustrated. As shown in FIG. 6, the first shield land 10, the second shield land 11, and the third shield land 12 are on one side where the cutout of the second shield 8 is formed. The lands 11 and the lands 10 and 12 on one side opposite to the first and third shields 7 and 9 having complete four side walls are also arranged on the same straight line L of the printed circuit board.

  As shown in FIG. 6, lands 10, 11, and 12 for mounting three shield cases of the first shield 7, the second shield 8, and the third shield 9 are formed on the same straight line L of the printed circuit board. By using the same printed circuit board, as shown in FIG. 7, the shield case forming the notch is reversed from the case of FIG. 5, and one side of the second shield 14 having a complete four-side wall It is also possible to arrange the two sides of the first and third shields 13 and 15 in which notches are formed in a part of the four side walls on the same straight line L. FIG. 7 is a schematic view showing an example different from FIG. 5 of the shield board mounting method of the present invention. The notch forming method and the arrangement of each shield case when three shield cases are mounted on a printed board. FIG. 5 shows an example in which a notch is formed on one side of the shield case different from that shown in FIG. 5, that is, on the same straight line L of the first and third shields 13 and 15.

  When three shield cases of the first, second, and third shields 13, 14, and 15 as shown in FIG. 7 are arranged on the printed board, the printed board is shown in FIG. It is possible to mount the three shield cases of the first, second, and third shields 13, 14, and 15 while the lands 10, 11, and 12 are formed at the same position. FIG. 8 is a schematic diagram showing an example of the shield mounting board of the present invention different from that of FIG. 6, and the land for mounting the three shield cases shown in the shield board mounting method of FIG. The same formation position is illustrated.

  Thus, in the mounting method of the shield case as shown in FIG. 5, when noise wraps around the circuit components in the second shield 8 where the notch is formed and a problem occurs in the electrical characteristics, 7, a notch is formed on the first and third shields 13 and 15 on the opposite side, and a shield case having a complete wall is used for the second shield 14. It is possible to prevent noise from entering the second shield 14 without revising (ie, without changing the land position of the printed circuit board). As described above, by making it possible to mount any of the two types of shield cases on the same printed circuit board, it is possible to reduce the risk of quality degradation due to noise.

The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention. For example, the embodiment of the present invention can be expressed as the following configurations in addition to the configurations (1) and (4) in the means for solving the problems. The numbers (2)-(3) and (5)-(6) below correspond to the item numbers in the claims.
(2) As a land formation position of the printed circuit board for mounting the plurality of shield cases, one side having the cutout of the cutout shield case, and 1 having the cutout of the cutout shield case The shield mounting board according to (1), wherein the lands for mounting each of the opposing shield cases arranged to face the sides are arranged on the same straight line.
(3) When the notch shield case and the opposing shield case are replaced with a shield case that forms a notch, the notch shield case has a complete shield structure, and the notch is formed in the opposing shield case, The shield mounting board according to (2), wherein a notch is formed on one side of the opposed shield case that is arranged on the same straight line as one side of the cutout shield case.
(5) As a formation position of the land of the printed circuit board for mounting a plurality of the shield cases, one side having the cutout of the cutout shield case and the cutout of the cutout shield case 1 (4) The shield substrate mounting method according to (4), wherein the lands for mounting one side of the opposing shield case arranged to face each side are arranged so as to be arranged on the same straight line.
(6) For the cutout shield case and the opposed shield case, the shield case that forms the cutout is replaced, the cutout shield case has a complete shield structure, and the cutout is formed in the opposed shield case. The shield substrate mounting method according to the above (5), wherein a notch is formed on one side of the opposing shield case that is arranged on the same straight line as one side of the notch shield case.

DESCRIPTION OF SYMBOLS 1 1st shield 1A Shield 2A Shield 2 2nd shield 3 Land 4 Land 5 1st shield 6 2nd shield 7 1st shield 8 2nd shield 9 3rd shield 10 Land 11 Land 12 Land 13 1st 1 shield 14 2nd shield 15 3rd shield

Claims (2)

In a shield substrate mounting method in which a plurality of shield cases each having a plurality of side walls are mounted on a printed circuit board adjacent to each other ,
Among the plurality of shield cases , at least one shield case is a not-cut shield case that does not form a notch, and the remaining one or more shield cases are notch shield cases that are partially formed with a notch , the notch and one side surface which is newly formed by lack the cut of the shield case, the cutout shield case of the notch in the engaged is the notch unshielded case viewed from the same straight line and one side wall of the When mounting a plurality of the shield cases on the printed circuit board by arranging them in a line ,
When noise enters a circuit component in one or a plurality of the cutout shield cases to cause a problem in electrical characteristics, the cutout shield case is replaced with the cutout shield case, and the shield case A method for mounting a shield board , comprising: replacing the notched shield fitted in the notch with the notched shield case . As a land formation position of the printed circuit board for mounting the plurality of shield cases, the side wall having the cutout of the cutout shield case and the cutout of the cutout shield case are fitted to the cutout 2. The shield substrate mounting method according to claim 1 , wherein the lands for mounting one side wall of the shield case without cutout are formed so as to be arranged on the same straight line in plan view .

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