JP2002111271A - Shelf shield structure - Google Patents

Abstract

An object of the present invention is to provide a shelf shield structure that can sufficiently suppress electromagnetic wave noise in a shelf of an electronic device on which a substrate having an ejector is mounted. SOLUTION: In a board unit 5, a pair of shield blocks 37a to 37d are provided on the surface of a printed board 9 at positions closer to the inside of the shelf 1 than the ejectors 11, 13 corresponding to the pair of ejectors 11, 13, respectively. Attached. Further, a shield front panel 39 is attached to the front side of the printed circuit board 9 so as to fit between the attachment positions of the ejectors 11 and 13. The shield front panel 39 is electrically connected to the shield blocks 37a to 37d. Shield block 37a-37
d and the shield front panel 39 with the ejectors 11, 1
The shield is configured without hindering the rotation of the third.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure of a shelf for mounting a substrate on an electronic device.

[0002]

2. Description of the Related Art Conventionally, in a shelf used for electronic equipment, a front panel attached to a printed circuit board inserted into the shelf is screwed to a frame of the shelf.
Shelf is shielded to prevent electromagnetic wave leakage.
However, since screwing is not easy to remove, a so-called ejector (also referred to as a card plastic) is used instead of a screw as a member that is easy to remove.

The ejector is attached to the printed circuit board so as to be rotatable about a rotation axis. One end of the ejector is provided with an engagement projection that engages with a groove provided on the shelf. When the printed circuit board is inserted into the shelf, the user lifts the lever with the lever provided at the other end of the ejector. In this state, when the printed circuit board is inserted into the shelf and the printed circuit board is inserted to a predetermined position, the lever portion is pushed down, and the engaging protrusion is engaged with the groove. Further, a lock attached to the printed circuit board is inserted into and engaged with a lock engagement portion provided on the lever portion. As a result, the printed circuit board is fixed to the shelf, and the displacement of the printed circuit board can be prevented.

On the other hand, when the printed circuit board is to be removed, the lever is lifted and the ejector is rotated. When the ejector is rotated, the printing is performed according to the principle of leverage with the contact projection provided slightly on the front side than the engagement projection as a fulcrum. The substrate can be easily removed from the shelf.

[0005]

However, in the above-mentioned conventional ejector structure of the shelf, it is necessary to rotate the ejector, and it is necessary to form a notch in the front panel to secure the clearance. Providing the notch on the front panel as described above has a problem that leakage of electromagnetic wave noise cannot be suppressed.

The above-described ejector structure is merely an example, and there are various structures. Therefore, it is necessary to take measures against leakage of electromagnetic wave noise according to each structure.

Further, in an electronic device having a shelf, it is often necessary to take measures against static electricity and noise when a hot wire is inserted, and a shield structure which is effective also in this respect is desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shelf shield structure that can sufficiently suppress electromagnetic wave noise in a shelf of an electronic device on which boards having various structures of ejectors are mounted. Aim.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a shelf in which a plurality of substrates are detachably inserted into an outer frame by means of ejectors which are rotatably attached to both front ends thereof. A pair of shield blocks attached to a position closer to the inside of the shelf than the ejectors, corresponding to each of the pair of ejectors on the surface of the substrate, and a front side of the substrate. A front panel is attached while securing a space for the ejector to rotate, and is electrically connected to the pair of shield blocks.

According to this configuration, the shield structure is provided inside the ejector by the pair of shield blocks and the front panel. Therefore, even if the rotation space of the ejector is provided outside the shield structure, the electromagnetic and physical shields are provided. Sex can be maintained. As a result, it is possible to prevent leakage of electromagnetic noise from an electronic circuit mounted on the substrate without affecting the movement of the ejector.

Further, in the present invention, one shield block attached to a certain substrate may have a contact point which makes electrical contact with another shield block attached to another adjacent substrate.

According to this configuration, since the adjacent shield blocks are electrically connected, the shielding performance is further improved.

Further, in the present invention, one front panel attached to a certain substrate may have a contact that makes electrical contact with another front panel attached to another adjacent substrate.

According to this configuration, since the adjacent front panels are electrically connected, the shielding performance is further improved.

Further, in the present invention, the one front panel inserted into the outer frame and the other front panel inserted separately from the one front panel are electrically connected to each other. A blank panel to be connected may be further provided.

With this configuration, when the board is not mounted on the shelf, this space is covered with a blank panel, and the front panels that are separated from each other are electrically connected, so that the shielding performance can be maintained.

Further, in the present invention, the outer frame may have a contact which makes electrical contact with the shield block when the substrate is inserted into a predetermined position in the outer frame.

According to this structure, the shield structure including the shield block and the front panel can be connected to the outer frame to secure a discharge path for electrostatic energy.

Further, in the present invention, a wiring for electrically connecting a pair of shield blocks attached to the substrate may be further provided. Further, the wiring may be a conductive pattern formed on the substrate.

With this configuration, the conductivity between the shield blocks can be increased, and the shield performance can be improved. Further, when the wiring is a conductive pattern formed on the substrate, the wiring can be provided easily and in a space-saving manner.

Further, in the present invention, when the substrate is inserted into the outer frame, the outer frame is not electrically connected to the terminal provided on the outer frame and the terminal provided on the substrate. The shield block may have a contact point for making electrical contact with the body.

According to this configuration, when the board is inserted into the shelf, the shield block and the shelf are electrically connected before the so-called hot wire insertion, so that the static energy or the like of the human body can be discharged when the hot wire is inserted. .

In the present invention, the contact may be formed of a conductive spring.

With this configuration, the conductive spring comes into close contact with the contact object by its elastic force, so that a gap at the contact position can be eliminated and unnecessary radiation noise can be prevented from leaking.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a shelf of an electronic device according to an embodiment of the present invention. As shown in FIG. 1, the shelf 1 includes an outer frame 3,
A plurality of board units 5 can be inserted into the outer frame 3 at predetermined positions. A blank front panel 7 is detachably attached to a position where the board unit 5 is not inserted. The outer frame 3 is made of a conductive material such as a conductive metal or a conductive resin. The outer frame 3 is grounded.

Next, an insertion mechanism of the board unit in the shelf according to the present embodiment will be described.

FIG. 2 is a perspective view showing the insertion of the board unit into the outer frame of the shelf according to the above embodiment. FIG. 3 is an enlarged view showing a board unit in the shelf according to the embodiment. FIG. 4 is an enlarged view showing an ejector in the shelf according to the embodiment.

As shown in FIG. 2, in the board unit 5, a pair of ejectors 11 and 13 are provided on both ends of the printed circuit board 9 on the front side (indicated by an arrow A in FIG. 2) of the shelf 1.
Are attached respectively. As shown in FIG. 3, the ejectors 11 and 13 are attached to the printed
It is attached so as to be rotatable around. Ejector 1
At one end of each of the first and the third members 13, a fitting projection 19 that fits into a fixing groove 17 provided on the outer frame body 3 is provided. Further, a contact protrusion 21 is provided slightly on the front side than the fitting protrusion 19. In addition, the ejectors 11 and 13
Is provided at the other end thereof, and a lock engagement portion 27 for engaging a lock 25 attached to the printed circuit board 9 is provided on the lever portion 23.

On the other hand, as shown in FIG. 2, a slide groove 31 for slidably mounting the board unit 5 is formed on the ceiling surface (not shown) and the bottom surface 29 of the outer frame 3 respectively. . Along the upper and lower edges on the front side of the outer frame 3, fixing grooves 17 into which the fitting projections 19 are fitted are respectively formed.

The attachment and detachment of the board unit 5 having such an insertion mechanism will be described. The substrate unit 5 is connected to the outer frame 3
When inserted into the levers 23 of the ejectors 11 and 13
Is pulled up (indicated by a dashed line in FIG. 3), the substrate unit 5 is inserted along the slide groove 31 from the front side toward the backboard 33. The lever unit 23 is pushed down while the board unit 5 is inserted to a predetermined position in the outer frame 3. Thereby, the fitting projections 19 of the ejectors 11 and 13 are fitted into the fixing grooves 17 of the outer frame 3.
Further, the lock 25 is inserted and engaged with the lock engagement portion 27 provided on the lever portion 23. Thereby, the board unit 5 is fixed to the outer frame 3.

On the other hand, when removing the board unit 5 from the outer frame body 3, when the lever portion 23 is pulled up, the fitting projection 19 comes off from the fixing groove 17 as shown in FIG.
When the contact protrusion 21 contacts the front edge 35 of the outer frame 3 and the lever 23 is further pulled up, the board unit 5 is pushed out to the front side by the leverage principle. At the same time, the lock 25 is disengaged from the lock engagement portion 27 of the lever portion 23. Thereafter, the board unit 5 is removed from the outer frame 3 by pulling out the board unit 5 along the slide groove 31.

Next, a shield structure in the shelf for electronic equipment according to the present embodiment will be described. The board unit 5 shown in FIG.
7d and a shield front panel 39 are attached. FIG. 5 is an exploded perspective view showing a shield block in the shelf according to the embodiment. The shield blocks 37 a to 37 d are attached near both ends on the front side of the printed circuit board 9 and on both sides. The shield blocks 37a to 37d have a key-like shape, and screw holes 41a and 41b for screwing are formed at both ends thereof. In addition, conductive springs 43 and 45 made of a conductive material are attached to the shield blocks 37a and 37c on one side of the printed circuit board 9.

FIG. 6 is a plan view showing a conductive connection pattern on a printed circuit board in the shelf according to the above embodiment. As shown in FIG. 6, a conductive pattern 4 for electrically connecting the shield blocks 37a to 37d is provided at the mounting position of the shield blocks 37a to 37d on the printed circuit board 9.
7 are formed. Therefore, the shield block 37a
37d are electrically connected to each other by the conductive pattern 47.

The formation of the conductive pattern 47 can be performed by avoiding application of a resist to a region where the conductive pattern 47 is to be formed in a resist coating step in forming a wiring pattern on the printed circuit board 9.

FIG. 7 is a perspective view showing a shield front panel of a board unit in the shelf according to the above embodiment. The shield front panel 39 is formed of a U-shaped flat plate member made of a conductive material. The size of the shield front panel 39 is set between the mounting positions of the pair of ejectors 11 and 13. This is to secure a rotation space for the ejectors 11 and 13.

The shield front panel 39 is provided with screw fixing pieces 49 and 51 corresponding to the screw holes 41b on the front side of the shield blocks 37a to 37d. On one side surface of the shield front panel 39, conductive springs 53, 54, 55, 56 made of a conductive material are attached. Here, the conductive springs 53 to 56 are divided into four, but all may be continuous.

The above-described pair of shield blocks 37a, 3
The printed circuit board 9 is sandwiched between the front and back sides by 7b, 37c and 37d, and the shield front panel 39 is arranged at a predetermined position. In this state, the shield blocks 37a-37
d, printed circuit board 9, and shield front panel 39
Are screwed together.

Next, the relationship between the board unit 5 and the outer frame 3 when the board unit 5 is inserted into the shelf 1 will be described. FIG. 8 is a schematic diagram illustrating a state where the board unit is inserted into the shelf according to the embodiment.

Shelf conductive springs 59 and 61 are provided on the ceiling surface 57 and the bottom surface 29 of the outer frame 3 of the shelf 1, respectively. These shelf conductive springs 59,
When the board unit 5 is inserted to a predetermined position in the shelf 1, the abutment 61 contacts the inner front end portions of the shield blocks 37a to 37d. As a result, the outer frame 3 and the shield blocks 37a to 37d are electrically connected, and the ceiling surface 57, one of the shield blocks 37a and 37b, the shield front panel 39, and the other shield block 37 are provided.
c, 37d, and the bottom surface portion 29 are integrated to form a shield structure.

Such a shield structure is provided by the ejector 1
Since it is located on the inner side of the shelf 1 than the ejectors 11 and 13, even if the rotation space for the ejectors 11 and 13 is provided outside of the shelf 1 (specifically, the size of the shield front panel 39 is Electromagnetic and physical shielding can be maintained, even if shortened to fit between locations). As a result, the leakage of the electromagnetic noise of the electronic circuit mounted on the printed circuit board 9 can be prevented without affecting the movement of the ejectors 11 and 13.

Next, the relationship between the plurality of substrate units 5 will be described. FIG. 9 is an enlarged view showing a connection state between the shield blocks of the board unit in the shelf according to the embodiment. FIG. 10 is an enlarged view showing a connection state between the shield front panels of the board unit in the shelf according to the above embodiment.

In the present embodiment, the conductive springs 43 and 45 are mounted on the shield blocks 37a to 37d mounted on one side of the printed circuit board 9. Thus, when a plurality of board units 5 are inserted into the shelf 1, as shown in FIG. 9, the conductive springs 43, 45 connect the other shield blocks 37c,
Contact the surface of 37d. As a result, the shield blocks 37a to 37d of the plurality of board units 5 are electrically connected to each other.

Also, conductive springs 53 to 56 are provided on one side surface of the shield front panel 39. Thus, when a plurality of board units 5 are inserted into the shelf 1, as shown in FIG. 10, the conductive spring 43 comes into contact with the surface of the adjacent board unit 5 on the side opposite to the shield front panel 39. . As a result, the shield front panels 39 of the plurality of board units 5 are electrically connected to each other.

The connection of the shield structure between the board units 5 prevents leakage of electromagnetic wave noise from between the adjacent board units 5 when a plurality of board units 5 are inserted into the shelf. .

FIG. 11 is a perspective view showing a blank panel in the shelf according to the above embodiment. The blank front panel 7 is attached to a portion of the outer frame 3 of the shelf 1 where the board unit 5 is not inserted. The blank front panel 7 is formed of a U-shaped flat plate member made of a conductive material, like the shield front panel 39.
Screw holes 63 and 65 for screwing the outer frame 3 with the screws 62 are formed on the upper and lower portions of the outer frame 3.
69. Further, conductive springs 73 to 77 are attached to one side surface portion 71 of the blank front panel 7.

When this blank front panel 7 is attached to the outer frame 3, as shown in FIG. 10, the shield front panel 39 of the adjacent board unit 5 and the conductive springs 73 to 7 are connected.
7 are electrically connected. As a result, the space between the shield front panels 39 which are separated from each other is closed by the blank front panel 7 and both are electrically connected, so that leakage of electromagnetic noise at a portion where the board unit 5 is not mounted is prevented, The shield performance of the shelf 1 can be maintained.

FIG. 12 is a schematic diagram showing the positional relationship among the backboard, the shelf conductive spring, and the shield block in the shelf according to the above embodiment. When the board unit 5 is inserted into the shelf 1,
The connector 73 provided on the printed circuit board 9 is inserted into the socket 72 provided on the printed circuit board 9 so that the shield blocks 37a to 37d and the shelf conductive springs 59 and 61 come into contact with each other before a so-called hot wire is inserted. By setting the positional relationship, the static energy or the like of the human body is discharged to the shelf 1 when the hot wire is inserted, so that the influence of noise and the like due to the static energy can be prevented.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the size of the shield front panel 39 is shortened so as to fit between the mounting positions of the ejectors 11 and 13 in order to secure a rotation space for the ejectors 11 and 13. However, the present invention is not limited to this. As shown in FIG. 13, notches 81 and 83 may be provided at both ends of the shield front panel 39 to secure a rotation space for the ejectors 11 and 13.

In the above embodiment, the shield blocks 37a to 37d have a key-like shape as described above. This is for the purpose of securing a movable space for the ejectors 11 and 13, enabling contact with the ceiling surface and the bottom surface of the outer frame 3, and securing a mounting space for the board unit 5. It is because. Therefore, the shapes of the shield blocks 37a to 37d do not need to be particularly limited to this example.

In the above embodiment, the conduction pattern 47 is formed on the printed circuit board 9 in order to obtain electrical conduction between the pair of upper and lower shield blocks 37a to 37d. However, the present invention is not particularly limited. For example, the shield blocks 37a to 37a-3
The same improvement in the shielding performance can be obtained by electrically connecting 7d. However, the above embodiment is excellent in that wiring can be easily and space-savingly provided.

[0051]

As described above, according to the present invention,
Since the shield structure is provided inside the ejector by a pair of shield blocks and the front panel, the electromagnetic circuit noise leakage of the electronic circuit mounted on the board without affecting the rotation of the ejector, and the live line This has the effect of preventing the intrusion of static electricity noise during insertion.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a shelf of an electronic device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing insertion of a board unit into an outer frame in the shelf according to the embodiment.

FIG. 3 is an enlarged view showing a board unit in the shelf according to the embodiment.

FIG. 4 is an enlarged view showing an ejector in the shelf according to the embodiment.

FIG. 5 is an exploded perspective view showing a shield block in the shelf according to the embodiment.

FIG. 6 is a plan view showing a conductive connection pattern of a printed circuit board in the shelf according to the embodiment.

FIG. 7 is a perspective view showing a shield front panel of a board unit in the shelf according to the embodiment.

FIG. 8 is a schematic view showing a state where a board unit is inserted into the shelf according to the embodiment.

FIG. 9 is an enlarged view showing a connection state between shield blocks of a board unit in the shelf according to the embodiment.

FIG. 10 is an enlarged view showing a connection state between shield front panels of a board unit in the shelf according to the embodiment.

FIG. 11 is a perspective view showing a blank panel in the shelf according to the embodiment.

FIG. 12 is a schematic diagram showing a positional relationship among a backboard, a shelf conductive spring, and a shield block in the shelf according to the embodiment.

FIG. 13 is a perspective view showing a modification of the shield front panel in the shelf according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shelf 3 Outer frame 5 Board unit 7 Blank front panel 9 Printed circuit board 11, 13 Ejector 17 Fixing groove part 19 Fitting protrusion part 21 Contact protrusion part 23 Lever part 25 Lock 27 Lock engagement part 29 Bottom part 31 Slide groove part 33 Backboard 35 Front edge 37a-37d Shield block 39 Shield front panel 43,45 Conductive spring 47 Conductive pattern 53-56 Conductive spring 59,61 Shelf conductive spring

Claims (9)

[Claims] 1. A shelf shield structure in which a plurality of substrates are detachably inserted into an outer frame body by ejectors rotatably attached to both ends on the front side thereof, wherein the pair of ejectors are mounted on a surface of the substrate. Corresponding to each of a pair of shield blocks attached to a position closer to the inside of the shelf than the ejector, attached to the front side of the substrate while securing a space for the ejector to rotate, And a front panel electrically connected to the pair of shield blocks. 2. The shelf according to claim 1, wherein one shield block attached to one substrate has a contact point that makes electrical contact with another shield block attached to another adjacent substrate. Shield structure. 3. A front panel attached to one substrate has a contact for making electrical contact with another front panel attached to another adjacent substrate. 2. The shield structure of the shelf according to 2. 4. A blank panel disposed between one front panel inserted into the outer frame body and another front panel separately inserted from the one front panel and electrically connected to both. The shelf shield structure according to claim 3, further comprising: 5. The outer frame body according to claim 1, wherein the outer frame body has a contact that is in electrical contact with the shield block when the substrate is inserted into a predetermined position in the outer frame body. The shield structure of the shelf according to any of the above. 6. The shelf shield structure according to claim 1, further comprising a wiring for electrically connecting a pair of shield blocks attached to the substrate. 7. The shelf shield structure according to claim 6, wherein the wiring is a conductive pattern formed on the substrate. 8. When the substrate is inserted into the outer frame, the outer frame and the shield are connected before the terminal provided on the outer frame is electrically connected to the terminal provided on the substrate. The shelf shield structure according to any one of claims 1 to 7, wherein the block has a contact that makes electrical contact with the block. 9. The shield structure for a shelf according to claim 2, wherein the contact is formed by a conductive spring.