JP4530091B2 - Shield structure - Google Patents

Description

  The present invention relates to a shield structure that covers and shields a shield target portion on a substrate surface of a circuit board.

  FIG. 13a shows a schematic perspective view of an example of the shield case (see, for example, Patent Document 1), and FIG. 13b shows the shield case of FIG. 13a in an exploded state. The shield case 40 covers and shields a portion to be shielded on the board surface 41a of the circuit board 41. In this example, the shield case 40 has a frame 42 made of a conductor and a cover 43 made of a conductor. Configured.

  The frame 42 is configured by a peripheral wall that surrounds a shield target portion on the circuit board surface 41a. The frame 42 is provided with a joining terminal 44 that is formed so as to extend outward along the circuit board surface 41a from the lower edge that contacts the circuit board surface 41a. As shown in the schematic cross-sectional view of FIG. 13c, the bonding terminal 44 is bonded to the circuit board surface 41a by the solder 45 interposed between the bonding terminal 44 and the circuit board surface 41a. 42 is fixed to the circuit board surface 41a. On the circuit board surface 41a, a ground electrode (not shown) is formed at the joint portion of the joint terminal 44. The joining terminal 44 is joined to the circuit board surface 41a by the solder 45 and connected to the grounding electrode, whereby the joining terminal 44 (frame 42) is grounded to the circuit board 41 via the grounding electrode on the circuit board surface 41a. Grounded.

  The cover 43 is provided with a peripheral wall portion 46 that fits with the outer peripheral surface of the frame 42. The cover 43 has a peripheral wall portion 46 fitted to the outer peripheral surface of the frame 42 and integrally combined with the frame 42 to cover the shield target portion of the circuit board surface 41a. The cover 43 is grounded to the ground of the circuit board 41 through the frame 42 by a combination by fitting with the frame 42, and shields a shield target portion of the circuit board surface 41a.

  Note that reference numeral 47 in FIG. 13 a and FIG. 13 b indicates an electrical component for circuit configuration mounted on the circuit board 41.

JP-A-7-147495 Japanese Utility Model Publication No. 1-165697 JP-A-6-13522

  By the way, in the step of joining the frame 42 to the circuit board 41, the solder 45 melted by heating excessively wets the outer peripheral surface of the frame 42, and the solder 45 may be cooled and cured in this state. In this case, when the cover 43 is combined with the frame 42 after the joining process of the frame 42 to the circuit board 41, the solder 45 is included between the frame 42 and the cover 43 in the fitting portion. In some cases, flux, which is an insulating material, is interposed. If flux intervenes in the fitting portion between the frame 42 and the cover 43, the electrical connection (conduction) between the frame 42 and the cover 43 becomes unstable, and the cover 43 is stably grounded to the ground. I can't. Thereby, the problem that the shield performance of the shield object part by the cover 43 will deteriorate generate | occur | produces.

The present invention has the following configuration as means for solving the above problems. That is, this invention
In the shield structure having a shield cover that covers and shields the shield target part on the circuit board surface of the circuit board,
On the circuit board surface, a plurality of columnar base members are arranged on the periphery of the shield target portion so as to surround the shield target portion with a space between each other, and each columnar base member is fixed to the circuit board surface with solder. Is grounded to the ground formed on the circuit board,
Shield cover has a peripheral wall which is Shin設from the peripheral edge portion of the cover surface which covers a shielding target portion of the circuit board toward the periphery of the shield target portion of the circuit board surface, the peripheral wall portion, the base members The elastic wall portion is formed to correspond to each of the arrangement positions, and the elastic wall portion presses the side surface of the base member with an elastic force to fix the shield cover to the base member and press contact with the base member. The shield cover is grounded to the ground of the circuit board through the part,
The elastic wall portion includes one elastic wall portion that elastically presses one side of the side surface portions of the base member that face each other, and the other side surface of the base member that forms a pair with the elastic wall portion. An elastic wall portion that elastically presses the part, and the elastic wall portion that forms a pair of the one elastic wall portion and the other elastic wall portion sandwiches a common base member from both sides by elastic force, and The shield cover is fixed to the base member and grounded to the ground of the circuit board, and one or both of the elastic wall portions forming the pair includes at least a pressing contact portion with the base member. An edge is provided in part, and the edge is characterized in that when the shield cover is fitted to the base member , the edge is slidably fitted and brought into direct contact with the base member .

In addition, this invention
In the shield structure having a shield cover that covers and shields the shield target part on the circuit board surface of the circuit board,
On the circuit board surface of the circuit board, a frame arranged upright at the periphery of the shield target part is joined and fixed by solder, and the frame is grounded to the ground formed on the circuit board via the solder,
The shield cover has a peripheral wall portion extending from the peripheral end portion of the cover surface covering the shield target portion of the circuit board toward the peripheral edge portion of the shield target portion of the circuit board surface, and the peripheral wall portion is formed on the frame. The standing wall surface is pressed by an elastic force to fix the shield cover to the frame and has an elastic wall portion for grounding the shield cover to the ground of the circuit board via a pressing contact portion with the frame. It has a tongue piece shape extended from the peripheral end portion of the cover surface toward the peripheral portion of the shield target portion of the circuit board surface, and the edge on at least one side in the width direction of the tongue piece shape is the frame. The bent tip forms an edge, and the edge is slidably fitted when the shield cover is fitted to the frame and directly contacts the frame. It is also features a.
Furthermore, this invention
In the shield structure having a shield cover that covers and shields the shield target part on the circuit board surface of the circuit board,
On the circuit board surface, a plurality of columnar base members are arranged on the periphery of the shield target portion so as to surround the shield target portion with a space between each other, and each columnar base member is fixed to the circuit board surface with solder. Is grounded to the ground formed on the circuit board,
The shield cover has a peripheral wall portion extending from the peripheral end portion of the cover surface covering the shield target portion of the circuit board toward the peripheral edge portion of the shield target portion of the circuit board surface. The elastic wall portion is formed to correspond to each of the arrangement positions, and the elastic wall portion presses the side surface of the base member with an elastic force to fix the shield cover to the base member and press contact with the base member. The shield cover is grounded to the ground of the circuit board through the part, and the elastic wall portion extends from the peripheral end portion of the cover surface toward the peripheral portion of the shield target portion of the circuit board surface. had tongue shape, the width direction of at least one side edge of the tongue-shaped bent toward the base member, form the bent tip and edge, that edge is the shield to the base member That directly contacts the base member slides fitted move when fitting the bar are also characterized.

  According to this invention, at least a part of the pressing contact portion with the frame or the base member in the elastic wall portion of the shield cover is formed as an edge. The edge is removed so as to scrape off the insulator (for example, flux or oxide (for example, rust)) adhering to the frame standing wall or the side of the base member during the sliding fitting movement with the frame or the base member. It functions as a removal unit. For this reason, a flame | frame or a base member and a shield cover contact | abut directly, without being interrupted by the said insulator. Accordingly, the shield cover can be electrically and stably connected to the frame or the base member, and is stably grounded to the ground of the circuit board. That is, it is possible to suppress a problem of deterioration of the shield performance of the shield cover due to an insulator such as flux or rust remaining on the wall surface of the frame or the base member, and it is possible to provide a shield structure with high shield performance. .

It is a typical perspective view of the shield structure of 1st Example. FIG. 1b is a schematic exploded view of the shield structure of FIG. 1a. It is the top view which extracted and extracted the characteristic component part in the shield structure of 1st Example typically. FIG. 2b is a schematic side view of the component shown in FIG. 2a of the shield structure. It is a figure showing the shield cover which comprises the shield structure of 1st Example. It is a figure showing the flame | frame which comprises the shield structure of 1st Example. It is a typical exploded view for explaining the shield structure of the 2nd example. It is a typical top view for demonstrating the shield structure of 2nd Example. It is the model figure which extracted and represented the characteristic component part in the shield structure of 2nd Example. It is the top view showing the example of the form which looked at the component represented by FIG. 7 from the upper side. It is the perspective view which represented typically the specific component part of the shield cover which comprises the shield structure of 2nd Example. It is the typical perspective view which extracted and represented the characteristic part in the shield structure of 3rd Example. It is the figure which represented typically the example of the form of the shield structure seen from the FF part of FIG. 10a. It is a figure for demonstrating the shield structure of 4th Example. It is a figure for demonstrating the other Example. It is a perspective view of an example of the conventional shield structure. FIG. 13b is a schematic exploded view of the shield structure of FIG. 13a. It is typical sectional drawing for demonstrating the joining state example of the flame | frame and circuit board which comprise the shield structure of FIG. 13a.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,20 Shield structure 2 Frame 3,23 Shield cover 4,21 Circuit board 14,27,28,29 Elastic wall part 15,30 Introduction part 22 Base member

  Embodiments according to the present invention will be described below with reference to the drawings.

  FIG. 1a shows a schematic perspective view of the shield structure of the first embodiment, and FIG. 1b schematically shows the shield structure in an exploded state. FIG. 2a shows a region A surrounded by a dotted line in FIG. 1a as a schematic plan view seen from above, and FIG. 2b shows the shield structure in the direction of arrow B in FIG. 2a. A side view of is shown. The shield structure 1 of the first embodiment has a frame 2 made of conductors as shown below and a shield cover 3 made of conductors. FIG. 3 is a plan view showing the shield cover 3 as viewed from above and from the side. FIG. 4 is a plan view showing a state in which the frame 2 is viewed from the upper side and the side surface.

  The frame 2 has a form of a peripheral wall that stands upright at a peripheral portion of a predetermined shield target portion (shaded portion shown in FIG. 1 b) X on the substrate surface 4 a of the circuit board 4. In the first embodiment, an electrode 6 is formed on the periphery of the shield target portion X on the circuit board surface 4a. The electrode 6 is electrically connected to a ground (not shown) formed on the circuit board 4 by connection means not shown. The lower end edge of the frame 2 is fixed to the circuit board 4 by being joined to the electrode 6 on the circuit board surface 4a by solder (not shown). For this reason, the frame 2 is grounded to the ground of the circuit board 4 via the solder and the electrode 6.

  In the first embodiment, the frame 2 is a component that can handle automatic mounting. That is, the suction target surface portion 7 is disposed at the center portion of the upper surface opening of the frame 2 in a state where it is supported on the peripheral wall of the frame 2 by the connecting portion 8. The suction target surface portion 7 has a surface with a large area to be sucked by a suction nozzle for parts conveyance. By sucking the suction target surface portion 7 by a component transport suction nozzle, it is possible to automatically transport the frame 2 from, for example, a component storage tray onto the circuit board surface 4a. The formation position of the suction target surface portion 7 is designed in consideration of the position of the center of gravity of the frame 2 so that the frame 2 has a stable posture without being tilted when the suction target surface portion 7 is sucked by the suction nozzle. .

  At the lower end edge of the frame 2, a positioning protrusion 10 is formed protruding downward. In the first embodiment, the positioning protrusions 10 are arranged in a scattered manner at a plurality of locations on the lower end edge of the frame 2 with a space therebetween. A positioning hole 11 is formed in the circuit board 4 at a position corresponding to the positioning protrusion 10 of the frame 2. The frame 2 is positioned on the circuit board surface 4 a by fitting the positioning protrusions 10 of the frame 2 into the corresponding holes 11 of the circuit board 4. That is, when the frame 2 is disposed on the circuit board surface 4a by a human hand, or when the frame 2 is automatically transported and disposed on the circuit board surface 4a, the projecting portion for positioning the frame 2 is used. The frame 2 can be positioned with high accuracy at a predetermined mounting position on the circuit board surface 4a simply by fitting 10 into the positioning hole 11 of the circuit board.

  The shield cover 3 extends in a flat cover surface 12 that covers the shield target portion X of the circuit board surface 4a, and extends from the peripheral end of the cover surface 12 toward the peripheral portion of the shield target portion X of the circuit board surface 4a. And a peripheral wall portion 13. The shield cover 3 is assembled to the frame 2 with the peripheral wall portion 13 fitting to the outer peripheral surface of the standing wall surface of the frame 2. In this 1st Example, the surrounding wall part 13 is comprised by the some elastic wall part 14 of the tongue piece shape. Each elastic wall portion 14 is bent at both sides in the width direction of the tongue piece shape toward the standing wall surface of the frame 2. The bent front end portions 14E on both sides press the standing wall surface of the frame 2 by elastic force (see FIGS. 2a and 2b). The shield cover 3 is fixed to the frame 2 by elastic pressing of the elastic wall portions 14 to the frame 2. The circuit board 4 is grounded. As a result, the shield cover 3 shields the shield target portion X of the circuit board 4.

  By the way, in this 1st Example, the press contact site | part 14E of the elastic wall part 14 to the flame | frame 2 has comprised the edge. For this reason, the solder flux wets up to the contact portion with the elastic wall portion 14 on the standing wall surface of the frame 2 due to excessive wetting of the solder when soldering the frame 2 to the circuit board 4. In such a case, during the relative sliding fitting movement between the pressing contact portion 14E of the elastic wall portion 14 and the standing wall surface of the frame 2 when the shield cover 3 is fitted to the frame 2, the elastic wall portion 14 The edge 14E of the pressing contact portion is removed so that the flux on the standing wall surface of the frame 2 is scraped off. In addition, when there is an insulator other than the flux or an oxide such as rust on the standing wall surface of the frame 2, similarly to the above, the relative relationship between the pressing contact portion 14E and the standing wall surface of the frame 2 is similar. During the sliding fitting movement, the edge 14E of the pressing contact portion of the elastic wall portion 14 is removed so that the insulator on the standing wall surface of the frame 2 is scraped off. Thereby, the edge 14E can contact | abut directly to the flame | frame 2 without being interrupted by the insulator on the standing wall surface of the flame | frame 2. FIG. That is, the edge 14E functions as an insulating material removal portion. As described above, in the first embodiment, the edge in the width direction of the tongue-shaped elastic wall portion 14 of the shield cover 3 is bent toward the frame 2, and the edge 14 </ b> E of the bent tip functions as an insulator removal portion. Let With this configuration, the insulator of the fitting portion between the shield cover 3 and the frame 2 can be removed while preventing the shape of the elastic wall portion 14 from becoming complicated, and stable electric power between the shield cover 3 and the frame 2 can be removed. Connection can be obtained.

  In the first embodiment, the corner portion on the lower end side of the elastic wall portion 14 is cut in order to make it easier to fit the shield cover 3 to the frame 2. The cut portion 15 serves as an introduction portion that guides the pressing contact portion 14E of the elastic wall portion 14 to the standing wall surface of the frame 2 when the shield cover 3 is fitted to the frame 2 (see, for example, FIG. 2b). As described above, since the elastic wall portion 14 of the shield cover 3 is provided with the introduction portion 15 to the pressing contact portion 14E, the shield cover 3 can be easily fitted to the frame 2. As a result, the elastic wall portion 14 of the shield cover 3 is deformed in an attempt to force the shield cover 3 to fit into the frame 2, and the fitting state between the shield cover 3 and the frame 2 becomes poor, The problem that work efficiency falls can be avoided.

  In the first embodiment, both sides in the width direction of the tongue-shaped shape constituting the elastic wall portion 14 are bent toward the frame 2, and the bent tip portions on both sides are elastic forces on the standing wall surface of the frame 2. However, for example, only one side in the width direction of the tongue-shaped portion constituting the elastic wall portion 14 is directed to the frame 2. In this case, only the bent tip portion may be pressed against the frame 2 and the pressed contact portion may be an edge that functions as an insulator removing portion.

  Further, in this first embodiment, the corner portion on the lower edge side of the elastic wall portion 14 is cut to form the introduction portion 15, and the cut surface of the introduction portion 15 is planar, but the introduction portion 15. The cut surface is not particularly limited as long as it can smoothly guide the pressing contact portion 14E of the elastic wall portion 14 to the standing wall surface of the frame 2. For example, the cut surface of the introduction portion 15 is a curved surface. The shape (R surface) may be sufficient. Further, in the first embodiment, the introduction portion 15 is formed, but the introduction portion 15 may not be provided in some cases.

  The second embodiment will be described below. In the description of the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and a duplicate description of the common portions is omitted.

  FIG. 5 shows a schematic exploded view of the shield structure of the second embodiment. FIG. 6 shows a plan view when the shield structure of the second embodiment is viewed from above and from the side. Further, FIG. 7 shows a schematic cross-sectional view of the CC portion of FIG. 6, and FIG. 8 shows an enlarged view of the portion surrounded by the dotted line D of FIG. The shield structure 20 according to the second embodiment includes a plurality of columnar base members 22 fixed to the circuit board 21 and a shield cover 23 that covers the shield target portion X of the circuit board 21.

  In this second embodiment, the base member 22 is made of a conductor and has a rectangular parallelepiped shape or a rectangular shape that is a regular quadrangular prism shape. In the case where the base member 22 has a rectangular parallelepiped shape, in the second embodiment, the base member 22 has a rectangular parallelepiped shape with a cross section when the base member 22 is cut along a plane orthogonal to the longitudinal direction.

The plurality of base members 22 are arranged sideways along the circuit board surface 21a in an arrangement form that surrounds the shield target part X along the peripheral edge of the shield target part X of the circuit board surface 21a while being spaced apart from each other. It is fixed to the circuit board surface 21a by soldering. An electrode pad (not shown) is formed at each position on the circuit board surface 2 1 a to which each base member 22 is fixed. Each electrode pad is grounded to the ground (not shown) of the circuit board 21. Accordingly, each base member 22 is grounded to the ground of the circuit board 21 by soldering each base member 22 to each electrode pad.

  In the second embodiment, the base member 22 has a cubic shape or a rectangular parallelepiped shape with a square cross section. For this reason, when joining the base member 22 to the circuit board 21, the base member 22 can be arranged and joined to the circuit board 22 without worrying about the orientation of the top and the like of the base member 22.

  The shield cover 23 is manufactured by processing a conductor plate. The shield cover 23 is shielded from a flat cover surface 25 covering the shield target portion X of the circuit board 21 and a peripheral end portion of the cover surface 25. And a peripheral wall portion 26 formed to extend toward the peripheral edge portion of the target portion X. FIG. 9 is a schematic perspective view showing a portion of the shield cover 23 corresponding to the position where the base member 22 is arranged. In the second embodiment, in the portions corresponding to the arrangement positions of the base members 22 in the shield cover 23, they enter the edge portion of the cover surface 25 from the middle of the peripheral wall portion 26 toward the upper edge. The portion up to the position is cut and raised inside the cover from the edge side of the cover surface 25 to form a tongue piece 27. The tongue piece 27 is formed as an elastic wall portion that can be elastically deformed in the inner and outer directions of the cover. Both sides of the tongue shape of the elastic wall portion 27 in the width direction are bent toward the base member 22, and the bent tip portion 27E presses and contacts the side surface of the base member 22 with an elastic force (for example, see FIG. 8).

  Further, the lower end edge side portion of the peripheral wall portion 26 with respect to the portion where the tongue piece portion (elastic wall portion) 27 is cut and raised is cut along the vertical direction, and both side portions of the cutting position are bent toward the base member 22 respectively. Thus, elastic wall portions 28a and 28b are formed. The respective distal end portions 28E of the elastic wall portions 28a and 28b press and contact the side surfaces of the base member 22 by elastic force. The side surface of the base member 22 to which the elastic wall portions 28a and 28b are pressed and abutted is opposed to the side surface of the base member 22 to which the elastic wall portion 27 is pressed and abutted.

  In other words, in this second embodiment, the pair of elastic wall portions 28a and 28b and the elastic wall portion 27 form a pair and sandwich the common base member 22 from both sides by elastic force, whereby the shield cover 23 is fixed to the base member 22 and attached to the circuit board 21. The shield cover 23 is fixed to the base member 22 by the elastic wall portions 27, 28 a, and 28 b, so that the shield cover 23 is interposed between the elastic wall portions 27, 28 a, and 28 b and the base member 22. Thus, the shielded portion X of the circuit board 21 is shielded by being grounded to the ground of the circuit board 21. It should be noted that the elastic wall portion 27 has an elastic pressing force applied to the base member 22 by the elastic wall portion 27 so that the elastic pressing force applied to the base member 22 by the set of the elastic wall portions 28a and 28b is approximately the same. 27, 28a and 28b are preferably formed. Thereby, the stability of attachment of the shield cover 23 can be improved.

  In the second embodiment, as described above, the shield cover 23 is configured such that the pair of elastic wall portions 28a and 28b and the elastic wall portion 27 form a pair so that the base member 22 is sandwiched by elastic force. The structure is fixed to the member 22. With this configuration, the following effects can be obtained. For example, even if the arrangement position of the base member 22 is shifted, if at least one of the set of the elastic wall portions 28a and 28b and the elastic wall portion 27 can press the side surface of the base member 23, the shield cover 23 is connected to the circuit. It can be attached to the substrate 21. For this reason, it is not necessary to fix the base member 22 to the circuit board 21 with a high positional accuracy, and the base member 22 can be easily fixed to the circuit board 21. Further, since the pressing force is applied from both sides of the base member 22, the pressing forces are canceled out, thereby preventing the stress caused by the pressing force from being applied to the joint portion between the base member 22 and the circuit board 21. can do. For this reason, a crack or the like occurs in the joint portion between the base member 22 and the circuit board 21 due to the pressing force from the elastic wall portions 28a, 28b, 27 of the shield cover 23 to the base member 22, and the base member 22 becomes a circuit. The problem of easy peeling from the substrate 21 can be avoided.

  In this 2nd Example, the press contact part 27E to the base member 22 of the elastic wall part 27 has comprised the edge. Further, the pressing contact portion 28E of the elastic wall portions 28a, 28b to the base member 22 also forms an edge. The edges 27E and 28E are fluxes or oxides adhering to the side surface of the base member 22 during soldering during the sliding fitting movement of the side surface of the base member 22 when the shield cover 23 is fitted to the base member 22. The insulating material removal part which scrapes off insulations, such as etc., and contact | abuts directly to the base member 22 is comprised. As described above, in the second embodiment, the edge portions of the elastic wall portions 27, 28 a, and 28 b are bent toward the base member 22, and the edges 27 </ b> E and 28 </ b> E at the bent tips adhere to the surface of the base member 22. It consists of an object removal section. Since the structure of the removal portion is simple, the insulator at the pressing contact portion between the shield cover 23 and the base member 22 can be easily removed while suppressing the complexity of the shape of the shield cover 23. A stable electrical connection between the shield cover 23 and the base member 22 can be obtained. Thereby, by providing the structure of 2nd Example, the reliable shield structure with respect to shield performance can be provided.

  In the second embodiment, the corner portion on the lower end side of the elastic wall portion 27 is cut in order to make it easier to fit the shield cover 23 to the base member 22. The cut portion 30 is an introduction portion that guides the pressing contact portion 27E of the elastic wall portion 27 to the side surface of the base member 22 when the shield cover 23 is fitted to the base member 22 (see, for example, FIG. 7). As described above, since the elastic wall portion 27 of the shield cover 23 is provided with the introduction portion 30 to the pressing contact portion 27E, the shield cover 23 can be easily fitted to the base member 22. For this reason, the work efficiency of fitting with the shield cover 23 and the base member 22 can be improved. Further, for example, when the shield cover 23 is fitted to the base member 22, the elastic wall portions 27, 28 a and 28 b of the shield cover 23 are deformed so as to force the shield cover 23 to be fitted to the base member 22. Further, it is possible to avoid the problem that the fitting and fitting state of the shield cover 23 and the base member 22 becomes poor.

  In the second embodiment, both sides in the width direction of the elastic wall portion 27 are bent toward the base member 22, and the pressing contact portions of the bent leading end portions on the both sides to the base member 22 are respectively insulator removal portions. For example, the elastic wall portion 27 is bent only on one side in the width direction, the bent tip portion is a pressing contact portion to the base member 22, and the pressing contact portion is an insulator removing portion. As an edge that functions as: Furthermore, the elastic wall part that forms a pair with the elastic wall part 27 is configured by a set of elastic wall parts 28a and 28b. For example, the elastic wall part that forms a pair with the elastic wall part 27 includes the elastic wall part 28a, Either one of 28b may be sufficient.

  Moreover, in this 2nd Example, although the corner | angular part by the side of the lower end edge of the elastic wall part 27 was cut, the introduction part 30 was formed, and the cut surface of the introduction part 30 was planar, However, The introduction part 30 The cut surface is not particularly limited as long as it can smoothly guide the pressing contact portion 27E of the elastic wall portion 27 to the side surface of the base member 22. For example, the cut surface of the introduction portion 30 is a curved surface. The shape (R surface) may be sufficient. Furthermore, in the second embodiment, the introduction portion 30 is provided in the elastic wall portion 27, but the introduction portion 30 may not be provided in some cases.

  The third embodiment will be described below. In the description of the third embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and duplicate descriptions of common portions are omitted.

  In the third embodiment, as in the second embodiment, a portion corresponding to the arrangement position of the base member 22 is cut and raised on the peripheral wall portion 26 of the shield cover 23, and as shown in FIG. The elastic wall part 27 which consists of a part is formed. Further, in this third embodiment, the entire peripheral wall portion 26 is formed as an elastic wall portion 29 that can be elastically deformed inward and outward of the cover with the base end side of the extension formation as a fulcrum. The elastic wall portion 29 is bent outward at the position of the lower end edge of the cut and raised portion for the tongue piece portion of the elastic wall portion 27, and the portion of the cut and raised opening edge at the bent portion is With the elastic force, the side surface of the base member 22 is pressed and contacted. That is, in the third embodiment, the elastic wall 27 and the elastic wall 29 form a pair, and the common base member 22 is sandwiched by elastic force from both sides to fix the shield cover 23 to the base member 22. At the same time, it is grounded to the ground of the circuit board 21 through the pressing contact portion with the base member 22 and the base member 22.

  In the third embodiment, as described above, the shield cover 23 is configured such that the pair of elastic wall portions 27 and 29 are fitted and attached to the base member 22 by sandwiching the common base member 22 from both sides. It has. For this reason, the effect obtained from the configuration in which the shield cover 23 is fitted and attached to the base member 22 by the set of elastic wall portions 28a and 28b and the elastic wall portion 27 as described in the second embodiment. Similar effects can be obtained.

  In the third embodiment, as shown in FIG. 10b showing a model view seen from the FF portion of FIG. 10a, the pressing contact portion 29E of the elastic wall portion 29 to the base member 22 is formed of a cut surface. It is comprised by the edge and functions as an insulator removal part. That is, when the shield cover 23 is fitted to the base member 22, the edge of the pressing contact portion 29 </ b> E of the elastic wall portion 29 slides while pressing the side surface of the base member 22. If solder flux has adhered to the side surface of the base member 22 during solder joining, the edge of the pressing contact portion 29E of the elastic wall portion 29 is scraped off from the flux, and the pressing contact of the elastic wall portion 29 is performed. The edge of the portion 29 </ b> E can directly contact the side surface of the base member 22. For this reason, the favorable electrical connection of the elastic wall part 29 and the base member 22 can be obtained. Also in the third embodiment, similarly to the second embodiment, the edges 27E of the bent leading end portions on both sides of the elastic wall portion 27 function as an insulator removing portion.

  Other configurations of the shield structure 20 of the third embodiment are the same as those of the second embodiment.

  The fourth embodiment will be described below. In the description of the fourth embodiment, the same components as those in the second and third embodiments will be denoted by the same reference numerals, and overlapping description of the common portions will be omitted.

  In the fourth embodiment, as shown in the model diagram of FIG. 11, the edge 29 </ b> E as the insulator removing portion of the elastic wall portion 29 has a plurality of tips formed at the pressing contact portion toward the base member 22. It consists of parts. The configuration of the shield structure 20 of the fourth embodiment other than this configuration is the same as that of the third embodiment. In the fourth embodiment, when the shield cover 23 is fitted and attached to the base member 22, the pointed portion of the elastic wall portion 29 slides on the side surface of the base member 22 and adheres to the side surface of the base member 22. Remove any insulation. Thereby, the elastic wall portion 29 of the shield cover 23 can directly abut on the side surface of the base member 22 without being obstructed by the insulator. As a result, as in the second and third embodiments, a good electrical connection between the shield cover 23 and the base member 22 can be obtained, and the reliability of the shield structure with respect to the shield performance can be improved. it can.

In addition, this invention is not limited to the form of each 1st-4th Example, Various embodiment can be taken. For example, in the first embodiment, the peripheral wall portion 13 of the shield cover 3 is constituted only by the elastic wall portion 14, but the peripheral wall portion 13 is constituted by the elastic wall portion 14 and a wall portion that is not elastically deformed. May be. In the first embodiment, the suction target surface portion 7 is provided on the frame 2. For example, when the frame 2 is transported by other transport means that does not use the suction nozzle, the suction target surface portion is provided on the frame 2. 7 may not be provided. Further, in the first embodiment, the elastic wall portion 14 of the shield cover 3 has a configuration in which the outer peripheral surface of the frame 2 is elastically pressed to fix the shield cover 3 to the frame 2. the wall portion 14, but it may also be configured to fix the shield cover 3 elastically presses the inner wall surface of the frame 2 to the frame 2.

  Further, in the first embodiment, the edge as the insulator removing portion of the pressing contact portion 14E of the elastic wall portion 14 is linear, but for example, the pressing contact portion of the elastic wall portion 14 is directed to the frame 2 toward the pressing contact portion. The edge as the insulator removing portion may be provided by one or more pointed portions as shown in the fourth embodiment.

Furthermore, in each of the first to fourth embodiments, the shield target portion X is a quadrangular shape, but of course, the shape of the shield target portion X may be another shape, and the shield covers 3 and 23 are It has a shape corresponding to the shape of the shield target portion X, and is not limited to the shape shown in FIG. 1a , FIG . 1b , FIG.

  Furthermore, in each of the second to fourth embodiments, an edge functioning as an insulator removing portion is provided at both pressing contact portions of the elastic wall portion forming a pair provided on the peripheral wall portion 26 of the shield cover 23. Although it was the structure, it is good also as a structure by which the edge as an insulator removal part is provided only in one side of the elastic wall part which comprises a pair.

Furthermore, in each of the second to fourth embodiments, the peripheral wall portion 26 of the shield cover 23 is formed with a pair of elastic wall portions, and the base member 22 is sandwiched from both sides by the pair of elastic wall portions to shield the shield cover. 23 is fixed to the base member 22, for example, the outer side surface portion of the base member 22 is elastically formed on the peripheral wall portion 26 of the shield cover 23 at a portion corresponding to the arrangement position of the base member 22. It is good also as a structure which provides only the elastic wall part to press and fixes the shield cover 23 to the base member 22 with the said elastic wall part. Moreover, it is good also as a structure which provides only the elastic wall part which elastically presses the inward side surface part of the base member 22, and fixes the shield cover 23 to the base member 22 with the said elastic wall part. Thus, the structure of the elastic wall part provided in the shield cover 23 is not limited to the form shown in the second to fourth embodiments.
However, as described above, when only the elastic wall portion that elastically presses one of the outward side surface portion and the inward side surface portion of the base member 22 is provided, the elastic wall portion is connected to the circuit from the peripheral end portion of the cover surface. It has a tongue piece shape extending toward the peripheral edge of the shield target portion of the substrate surface, and at least one edge in the width direction of the tongue piece shape is bent toward the base member, and the bent tip is Make an edge.

  Furthermore, the pressing contact portion 14E of the elastic wall portion 14 shown in the first embodiment to the frame 2 and the pressing contact portion of the elastic wall portion 27 shown in each of the second to fourth embodiments to the base member 22 are applied. The portion 27E is a straight line extending in the vertical direction, and the whole is an edge as an insulator removing portion. For example, as shown in the model diagram of FIG. 12, the elastic wall portion 14 is pressed against the frame 2 The contact part and the pressing contact part of the elastic wall portion 27 to the base member 22 are configured to be elastically pressed and contacted with the frame 2 or the base member 22 by a surface, and the lower edge of the surface of the pressing contact part Only the edge 14E (27E) may function as an insulator removing unit.

Furthermore, in each of the second to fourth embodiments, the base member 22 has a rectangular parallelepiped shape, but the base member 22 may have, for example, a columnar shape or a polygonal shape having five or more corners. Even in such a case, the base member 22 is soldered to the circuit board 21 with the side surface of the base member 22 being along the circuit board surface 21a. Also, of course, the shape of the pressing contact portion of the base member of the resilient wall Ru Tei a shape in consideration of the side shape of the base member.

  Furthermore, in each of the second to fourth embodiments, the four base members 22 are disposed on the peripheral portion of the shield target portion X of the circuit board 21, but the base disposed on the peripheral portion of the shield target portion X is provided. The number of the members 22 is not limited, and an appropriate number of base members 22 may be disposed in consideration of the shape, size, etc. of the shield target portion X.

  Since the present invention can stabilize the shield performance, it is suitable as a shield structure provided on a circuit board provided with a high-frequency circuit that requires high shield performance.

Claims (7)

In the shield structure having a shield cover that covers and shields the shield target part on the circuit board surface of the circuit board,
On the circuit board surface, a plurality of columnar base members are arranged on the periphery of the shield target portion so as to surround the shield target portion with a space between each other, and each columnar base member is fixed to the circuit board surface with solder. Is grounded to the ground formed on the circuit board,
The shield cover has a peripheral wall portion extending from the peripheral end portion of the cover surface covering the shield target portion of the circuit board toward the peripheral edge portion of the shield target portion of the circuit board surface. The elastic wall portion is formed to correspond to each of the arrangement positions, and the elastic wall portion presses the side surface of the base member with an elastic force to fix the shield cover to the base member and press contact with the base member. The shield cover is grounded to the ground of the circuit board through the part,
The elastic wall portion includes one elastic wall portion that elastically presses one side of the side surface portions of the base member that face each other, and the other side surface of the base member that forms a pair with the elastic wall portion. An elastic wall portion that elastically presses the part, and the elastic wall portion that forms a pair of the one elastic wall portion and the other elastic wall portion sandwiches a common base member from both sides by elastic force, and The shield cover is fixed to the base member and grounded to the ground of the circuit board, and one or both of the elastic wall portions forming the pair includes at least a pressing contact portion with the base member. A shield structure characterized in that an edge is provided in a part, and the edge is slidably fitted and brought into direct contact with the base member when the shield cover is fitted to the base member.   The elastic wall portion has a tongue piece shape extending from the peripheral end portion of the cover surface toward the peripheral portion of the shield target portion of the circuit board surface, and the edge of at least one side in the width direction of the tongue piece shape 2. The shield structure according to claim 1, wherein the shield is bent toward the base member, and the bent tip forms an edge. In the shield structure having a shield cover that covers and shields the shield target part on the circuit board surface of the circuit board,
On the circuit board surface of the circuit board, a frame arranged upright at the periphery of the shield target part is joined and fixed by solder, and the frame is grounded to the ground formed on the circuit board via the solder,
The shield cover has a peripheral wall portion extending from the peripheral end portion of the cover surface covering the shield target portion of the circuit board toward the peripheral edge portion of the shield target portion of the circuit board surface, and the peripheral wall portion is formed on the frame. The standing wall surface is pressed by an elastic force to fix the shield cover to the frame and has an elastic wall portion for grounding the shield cover to the ground of the circuit board via a pressing contact portion with the frame. It has a tongue piece shape extended from the peripheral end portion of the cover surface toward the peripheral portion of the shield target portion of the circuit board surface, and the edge on at least one side in the width direction of the tongue piece shape is the frame. The bent tip forms an edge, and the edge is slidably fitted when the shield cover is fitted to the frame and directly contacts the frame. Shield structure, characterized by that. In the shield structure having a shield cover that covers and shields the shield target part on the circuit board surface of the circuit board,
On the circuit board surface, a plurality of columnar base members are arranged on the periphery of the shield target portion so as to surround the shield target portion with a space between each other, and each columnar base member is fixed to the circuit board surface with solder. Is grounded to the ground formed on the circuit board,
The shield cover has a peripheral wall portion extending from the peripheral end portion of the cover surface covering the shield target portion of the circuit board toward the peripheral edge portion of the shield target portion of the circuit board surface. The elastic wall portion is formed to correspond to each of the arrangement positions, and the elastic wall portion presses the side surface of the base member with an elastic force to fix the shield cover to the base member and press contact with the base member. The shield cover is grounded to the ground of the circuit board through the part, and the elastic wall portion extends from the peripheral end portion of the cover surface toward the peripheral portion of the shield target portion of the circuit board surface. And the edge of at least one side in the width direction of the tongue shape is bent toward the base member, the bent tip forms an edge, and the edge shields the base member. Shielding structure characterized in that directly contacts the base member slides fitted move when fitting the bar.   3. The elastic wall portion is provided with an introduction portion for guiding a pressing contact portion of the elastic wall portion to a side surface of the base member when the shield cover is fitted to the base member. Or the shield structure of Claim 4. Shield structure according to claim 3 edge of the elastic wall, which the pressing contact portion, characterized in that it is constituted by one or more pointed part formed toward the off rate arm. Edge of the elastic wall, the pressing contact portion, claim, characterized in that it is constituted by one or more pointed part formed toward the base over the scan element 1 or claim 2 or claim 4 Or the shield structure of Claim 5 .

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