JP2005159144A - Shielding case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily mount a shielding case on a circuit board which is built into an electronic apparatus and to improve re-workability. <P>SOLUTION: The shielding case is constructed of a side plate 170 and a top plate 160. The side plate has a shape of a frame having a side 171 fixed on the circuit board, and has a plane 174 horizontally extending from the upper end of the side and having a predetermined area. The top plate 160 has a shape of a lid which can fit the side plate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shield case suitable for being applied to a shield case attached to a circuit board built in a small electronic device such as a mobile phone terminal.

  Conventionally, in various electronic devices equipped with a circuit board inside, the electromagnetic wave from the electronic circuit on the circuit board is prevented from radiating to the outside, and conversely, the external electromagnetic wave is prevented from adversely affecting the electronic circuit on the board. For this purpose, it is common practice to prevent these problems by covering the circuit board with a shield case.

On the other hand, in the case of a small portable electronic device such as a mobile phone terminal, there is a high demand for downsizing of the device, and it is necessary to efficiently arrange a circuit board in a casing constituting the device. For this reason, in the case of this type of small electronic device, it is necessary to reduce the size of the shield case. For example, instead of covering the entire circuit board with the shield case, there is a circuit that needs to be shielded on the circuit board. A small shield case is attached only to the assembled part. Japanese Patent Application Laid-Open No. H10-228667 discloses a small shield case attached to a part of a circuit board.
JP-A-6-338695

  By the way, the work of attaching the shield case to the circuit board has a problem that the workability is not so good. In other words, circuit components (so-called chip components) such as integrated circuits, resistors, and capacitors mounted on the circuit board are arranged at necessary locations on the circuit board by using a chip mounting device called a chip mounter. After that, in the soldering process, the arranged components are connected and fixed to the circuit on the substrate, and automatic manufacturing without human intervention is possible. On the other hand, for the shield case, for example, it is necessary to mount a plurality of shield case fixing members such as leaf springs for attaching the shield case on the circuit board, and to attach the shield case to the fixing member. There was a problem that installation was very troublesome.

  In some cases, the shield case itself may be fixed to the circuit board by soldering. In this case, a fixing member is not required, so that the mounting workability is slightly improved. Since it is necessary to arrange and solder on the top, improvement in workability as in the case of mounting circuit components cannot be expected. In addition, when the shield case itself is directly soldered, for example, when performing repairs such as replacing circuit parts in the shield case, it is necessary to remove the shield case fixed by soldering. There is a bad problem.

  The present invention has been made in view of these points, and an object of the present invention is to easily attach a shield case to a circuit board built in an electronic apparatus and to improve reworkability.

  The shield case of the present invention comprises a side plate portion and a top plate portion, and has a frame shape having a side portion fixed on the circuit board as the side plate portion, and extends substantially horizontally from the upper end of the side portion to a predetermined area. It is made into the shape which has a shape which has this flat part, and can be fitted to a side plate part as a top plate part, and can be covered.

  With this configuration, the side plate can be attached to the circuit board relatively easily, for example, by soldering the side plate on the circuit board, and the top plate is fitted to the side plate attached to the circuit board. It can be assembled as a shield case by covering them together. In addition, by having a flat portion extending from the upper end of the side plate portion, for example, using a chip mounting device, it is possible to pick up the flat portion and lift the frame-shaped side plate portion, and the automatic side plate portion Can be implemented.

  According to the present invention, for example, after the side plate portion is fixed on the circuit board, the top plate portion is fitted to the side plate portion, and the lid is simply assembled as a shield case. Assembling workability can be improved. Further, at the time of reworking such as replacement of circuit parts in the shield case, it is only necessary to remove the fitted top plate, and reworkability can be improved.

  In this case, the plane portion has an area that can be sucked by the chip mounting device that sucks the chip components on the circuit board, and is arranged at a position that is substantially the center of gravity of the side plate portion. Can be easily arranged on a circuit board, and automatic assembly becomes possible.

  Further, by providing a fitting projection on one of the side plate portion and the top plate portion and providing a fitting hole or recess on the other, it becomes possible to easily fit the side plate portion and the top plate portion.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
In this example, the shield case is attached to a circuit board to be built in a mobile phone terminal. FIG. 3 is a diagram showing a configuration example of the cellular phone terminal 100 of this example. The cellular phone terminal 100 of this example shown in FIG. 3 is configured by joining a first casing 110 and a second casing 120 so as to be freely opened and closed. The operation unit and display unit used as the mobile phone function are arranged on the back side in FIG. The description of the mechanism for opening and closing the first housing 110 and the second housing 120 is also omitted here.

  The mobile phone terminal 100 of this example incorporates a camera unit 200 (see FIG. 4) on the second housing 120 side, and a transparent member (on the outside of the housing where the camera unit is disposed) A filter 121 made of glass, resin, or the like is attached. The filter 121 functions as a protective member for the camera unit. Further, a mirror 122 and an illumination unit 123 are disposed adjacent to the filter 121. The mirror 122 is for a person (subject) looking at the camera to check the shooting angle of view when shooting with the camera unit 200. The illumination unit 123 is a light source used when photographing in a dark situation, and for example, a light emitting diode is used.

  In addition, a lens cover 130 is attached to the outside of the second housing 120 in which the filter 121, the mirror 122, and the illumination unit 123 are arranged so as to be movable in the longitudinal direction of the housing 120. 3 and 4, the lens cover 130 is shown in an opened position. When the lens cover 130 is closed, the lens cover 130 is positioned on the filter 121, the mirror 122, and the illumination unit 123.

  FIG. 4 is a view showing the inside of the second housing 120. The second housing 120 can be divided into two, an upper housing 120a and a lower housing 120b, and a circuit board 140 is disposed therein. The circuit board 140 is a set of circuits necessary for communication processing as a mobile phone terminal, and circuit components 151 for the circuits are attached by soldering or the like. In this case, some circuit components on the circuit board are directly covered with a relatively small shield case, and a shield top plate 160 as a member constituting the shield case is attached. Note that a camera unit mounting cutout 141 is provided at a position where the camera unit 200 of the circuit board 140 in the second housing 120 is disposed, and the box-shaped camera unit 200 is placed in the housing 120. It can be arranged.

  Next, the shield case part comprised in the circuit board 140 of this example is demonstrated with reference to FIG. 1, FIG. FIG. 1 is an exploded view showing a shield case portion formed on the circuit board 140 of this example. The shield case of this example is configured by a side plate portion and a top plate portion. That is, the board includes a shield side plate 170 made of a shield member (metal plate) fixed to the circuit board 140 by soldering, and a shield top plate 160 made of a metal plate fitted to the shield side plate 170. The circuit component 152 at a predetermined location on the 140 is shielded.

  The shield side plate 170 has a side portion 171 formed with a height of several millimeters over almost the entire circumference of the shield case, and the lower end of the side portion 171 is fixed to the circuit board 140 by soldering. And from the upper end of the side part 171, the upper edge part 172 is formed in several millimeter width horizontally inside. Further, a beam portion 173 is formed so as to connect the two places of the upper edge portion 172, and a substantially circular plane portion 174 having a predetermined area is formed in the approximate center of the beam portion 173. A plurality of projections 175 are formed on the side portion 171 at a predetermined interval.

  The flat portion 174 is disposed at a substantially central position that becomes the center of gravity when the shield side plate 170 is lifted, and the area of the circular flat portion 174 is absorbed by a chip mounting device that mounts chip components on a circuit board. The area that can be done.

  A shield top plate 160 that is a top plate portion to be fitted to the shield side plate 170 is formed of a shield member (metal plate), and extends almost entirely from the top plate portion 161 and the peripheral portion of the top plate portion 161. And upright sides 162. The side part 162 is provided with a through-hole 163 at a position corresponding to the protrusion 175 of the side part 171 of the shield side plate 170. The state where the shield top plate 160 is fitted to the shield side plate 170 is maintained by fitting the through holes 163 to the protrusions 175.

  FIG. 2 is a view showing a state in which the shield top plate 160 is fitted to the shield side plate 170. By assembling and assembling in this way, the circuit component 152 that needs to be shielded as shown in FIG. 1 is covered with a shield case composed of the shield top plate 160 and the shield side plate 170, and the shielding effect is achieved. Is obtained.

  According to the shield case configured in this manner, assembly can be easily performed. That is, at the time of assembly, for example, when the other circuit components 151 and 152 on the circuit board 140 are arranged by the chip mounting device, the planar portion 174 provided on the beam portion 173 of the shield side plate 170 is also provided for the shield side plate 170. It can be automatically arranged at a specified position using the chip mounting device by being picked up and lifted by the suction portion of the chip mounting device. The shield side plate 170 disposed on the substrate may be fixed to the substrate by soldering at the same time when soldering each circuit component on the circuit board 140, and the shield side plate 170 can be easily attached. Then, by simply fitting the through hole 163 of the shield top plate 160 into the projection 175 of the soldered shield side plate 170, the shield top plate 160 can be attached, and a separate shield case fixing member or the like is prepared. And can be easily installed.

  Further, the shield top plate 160 attached to the shield side plate 170 can be easily removed simply by removing the fitting state of the protrusions 175 into the through holes 163. Therefore, for example, even when it is necessary to replace the shielded internal circuit component 152, the inside can be easily opened, and reworkability can be improved.

  In the above-described embodiment, the shield top plate and the shield side plate are provided with projections on the shield side plate side, and through holes to be fitted with the projections on the shield top plate side. In addition, a through hole may be provided on the side plate side, and a protrusion may be provided on the top plate side for fitting. Moreover, you may make it provide the recessed part fitted with a processus | protrusion instead of a through-hole.

  In the above-described embodiments, the circuit board is built in a mobile phone terminal. However, it is needless to say that the present invention can be applied to circuit boards built in other various small electronic devices.

It is a perspective view which decomposes | disassembles and shows the structural example of the shield part by one embodiment of this invention. It is a perspective view which shows the structural example of the shield part by one embodiment of this invention. It is a perspective view which shows the structural example of the portable terminal by one embodiment of this invention. It is a perspective view which shows the example of the board | substrate arrangement | positioning state of the portable terminal by one embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Cell-phone terminal, 110 ... 1st housing | casing, 120 ... 2nd housing | casing, 130 ... Lens cover, 140 ... Circuit board, 141 ... Notch part for camera unit attachment, 151, 152 ... Circuit component, 160 ... Shield top plate, 161 ... Top plate portion, 162 ... Side portion, 163 ... Through hole, 170 ... Shield side plate, 171 ... Side portion, 172 ... Upper edge portion, 173 ... Beam portion, 174 ... Plane portion, 174 ... Protrusion 200, camera unit

Claims (3)

In the shield case attached to the place where the circuit that needs to be shielded on the circuit board is assembled,
A side plate portion formed of a frame-shaped shield member having a side portion fixed on the circuit board, and extending substantially horizontally from an upper end of the side portion and having a plane portion having a predetermined area;
A shield case comprising a top plate portion formed of a shield member having a shape that can be fitted to the side plate portion and can be covered. The shield case according to claim 1,
The said planar part has the area which can be adsorb | sucked with the chip | tip mounting apparatus which adsorb | sucks the chip components on a circuit board, and is arrange | positioned in the position used as the substantially gravity center of the said side-plate part. The shield case according to claim 1,
One of the side plate portion and the top plate portion is provided with a fitting protrusion, and the other is provided with a fitting hole or recess.

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