JPH0621293U - Shield case for printed circuit board - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a shield case for a printed circuit board in which the upper and lower covers used for the electromagnetic shield can be easily removed. A shielded case for a printed board for electromagnetically shielding an electric part attached to a printed board, and a case frame 4 having a size large enough to accommodate the electric part and fixed to the printed board 3. , Case frame 4
To the case frame 4, a lower cover 2 made of a magnetic material that is detachably mounted to the case frame 4, and a case frame 4 and the upper cover 1 are removable. Provided on the case frame 4 to be fixed to the case frame 4, the projection piece 5A, the claw 1A and the hole 1B provided on the upper cover 1, and the case frame 4 to detachably fix the case frame 4 and the lower cover 2 Protrusion 6 and protrusion piece 6A, and claw 2A and hole 2 provided in lower cover 2
A configuration comprising B and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shield case for electromagnetically shielding electric parts mounted on a printed circuit board, and more particularly to a shield case that can be easily removed.

[0002]

[Prior art]

 Conventionally, in this type of shield device, after fixing electrical components that need to be electromagnetically shielded to the printed circuit board by, for example, soldering, first, a case frame with an upper cover made of a magnetic material is used on the printed circuit board using solder or the like. Then, if necessary, the lower cover is soldered to the printed circuit board from the back side of the printed circuit board. In addition, instead of soldering the lower cover, it has also been practiced to hook and fix a plurality of claws to prevent the lower cover from falling off.

[0003]

[Problems to be solved by the device]

 According to the conventional technique described above, when the electric parts housed inside the shield case are to be inspected or the electric parts are to be replaced, the solder fixing the shield case is soldered. There was the inconvenience that it had to be melted and then removed. Further, when the claws for preventing the falling are hooked and fixed to the printed circuit board, it is necessary to provide a space for the claws to be caught in the printed circuit board, which makes it difficult to miniaturize the printed circuit board.

[0004]

[Means for Solving the Problems]

 The present invention is intended to solve the above-mentioned problems of the conventional art, and in order to achieve the object, a printed board shield case for electromagnetically shielding an electric part mounted on a printed circuit board is provided. A case frame that is large enough to accommodate the case and that is fixed to the printed circuit board; an upper cover made of a magnetic material that is detachably attached to the case frame; and a case frame that is removable from the case frame. A configuration including a lower cover made of a magnetic material to be mounted, a first fixing unit that detachably fixes the case frame and the upper cover, and a second fixing unit that detachably fixes the case frame and the lower cover. Is characterized by.

[0005]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

In the figure, a plurality of electric parts (not shown) are mounted on a printed circuit board 3, and a case frame 4 made of a magnetic material having a size enough to completely surround these electric parts is provided on the printed circuit board. It is fixed at 3. That is, after the plurality of legs 4A provided on the case frame 4 are inserted into the plurality of holes 3A provided at positions corresponding to the positions of the legs 4A on the printed circuit board 3, the printed circuit board 3 is attached to the printed circuit board 3 by using, for example, solder. Fixed.

A plurality of projections 5 and projection pieces 5A are formed on the two side surface portions of the case frame 4 (two side surface portions facing each other if possible), for example, by stamping using a press machine. Two of the protrusions 5 form a pair, and a protrusion piece 5A is arranged substantially in the center of the two protrusions 5.

The upper cover 1 made of a magnetic material is provided with a plurality of claws 1A and holes 1B having elastic force to be coupled to the protrusion 5 and the protrusion piece 5A, respectively. As shown in FIG. 2, when the upper cover 1 is covered with the upper cover 1, the claw 1A of the upper cover 1 is coupled with the protrusion 5 of the case frame 4, and at the same time, the protruding piece 5A uses its elastic force to cover the upper cover 1. It is automatically slid and fixed in the provided hole 1B. In this way, since the protruding piece 5A is caught in the hole 1B, the upper cover 1 is prevented from falling off.

On the other hand, the lower cover 2 is also provided with claws 2A and holes 2B that are exactly the same as the claws 1A and holes 1B described above. Further, the projection 6 and the projection piece 6A which are respectively coupled to the claw 2A and the hole 2B are provided in the same manner as the projection 5 and the projection piece 5A described above. Here, the protrusion 5 and the protrusion piece 5A of the case frame 4 used for mounting the upper cover 1 and the claws 1A and the holes 1B of the upper cover 1 are provided on the two side surfaces facing each other. Are arranged on the four side surfaces as shown.

Therefore, when the lower cover 2 is fitted into the printed circuit board 3 from below, the claws 2A and the holes 2B penetrate through the plurality of through holes 3B provided in the printed circuit board 3 in advance, and then, as shown in FIG. As shown, the claw 2A is coupled with the projection 6, and at the same time, the projection piece 6A having an elastic force is automatically slid and fixed in the hole 2B.

FIG. 3 shows another embodiment of the present invention, which is an embodiment of the type in which the plurality of through holes 3B described in FIG. 1 are not provided. That is, since the size of the printed circuit board 7 is set to be substantially the same as the outer frame of the case frame 4, the through hole 3B described in FIG. 1 becomes unnecessary when the lower cover 2 is mounted. The embodiment shown in FIG. 3 can reduce the size of the printed circuit board as compared with the embodiment shown in FIG.

When removing the upper cover 1 attached to the case frame 4, the upper cover 1 may be pulled up while lifting the claws 1A of the upper cover 1. Similarly, when the lower cover 2 is to be removed, The lower cover 2 may be pulled down while lifting the claws 2A of the lower cover 2. The upper and lower covers can be removed with this simple operation.

[0013]

[Effect of device]

 As described above, according to the present invention, since the upper and lower covers can be easily removed, it is possible to easily inspect and replace the electric components housed inside the shield frame, and to downsize the print substrate.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a structure of a shield case for a printed circuit board according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view showing a state in which upper and lower covers are attached to a case frame in the present embodiment.

FIG. 3 is an exploded perspective view showing a configuration of a printed circuit board shield case according to another embodiment of the present invention.

[Explanation of symbols]

 1 Upper cover 1A, 2A Claws 1B, 2B Hole 2 Lower cover 3,7 Printed circuit board 3A Hole 3B Through hole 4 Case frame 4A Feet 5,6 Protrusion 5A, 6A Protrusion piece

Claims (3)

[Scope of utility model registration request] 1. A shielded case for a printed board for electromagnetically shielding an electric part attached to a printed board, the case having a size large enough to accommodate the electric part and fixed to the printed board. A frame, an upper cover made of a magnetic material detachably attached to the case frame, a lower cover made of a magnetic substance detachably attached to the case frame, the case frame and the upper cover A shield case for a printed circuit board, comprising: a first fixing means for removably fixing and a second fixing means for removably fixing the case frame and the lower cover. 2. The claw and the hole provided in the upper cover, and the projection and the projection piece provided on the case frame at a position where the first fixing means engages with the claw and the hole. A shield case for a printed circuit board, comprising: 3. The claw and the hole provided in the lower cover, and the projection and the projection piece provided on the case frame at a position where the second fixing means engages with the claw and the hole. A shield case for a printed circuit board, comprising: