JPH0661677A - Structure of printed board containing shelf - Google Patents

Abstract

PURPOSE:To obtain a printed board containing shelf in which radiation of spurious radio wave is prevented. CONSTITUTION:The structure of printed board containing shelf comprises a cable introduction hole 36 made at a desired position of a shelf side board 31, a rectangular pan type body 51 having one open side face, flanges 52 provided for three side board members of the body 51, and a metal guide cover 50 for closing the front face of the cable introduction hole 36 with the body 51 when the flanges 52 are secured tightly to the inner side face of the sheld side board 31. A cable 7 is pulled through the introduction hole 36 into the metal guide cover 50 thence through an opening 53 thereof into a shelf and a cable connector 7A is plugged into a printed board connector 9 mounted on a printed board 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed board storage shelf, and more particularly to an electromagnetic wave leakage prevention structure.

As shown in FIG. 5, a video conference apparatus has a reception monitor 2 in the center of a self-standing type housing 1, a transmission monitor 3, a panoramic camera 4, a portrait camera 5, etc. above the reception monitor 2. It is mounted, and further, these device parts are connected to a shelf in which a plurality of printed boards (image coder, decoder) for digitally converting or reversely converting analog image data are mounted in a lower portion of the housing 1. Images and voices are sent and received with the other party through the line.

Since a printed board used in such an electronic device performs high-speed digital image processing, unnecessary radio waves are radiated (noise radiation). Therefore, a shelf for housing the printed circuit board is required to have a structure for shielding noise radiation.

[0004]

2. Description of the Related Art A conventional structure of a printed board accommodating shelf as described above is shown in FIGS. FIG. 6 is a diagram of a conventional example,
(A) is a perspective view of the shelf, (B) is a perspective view of the front cover,
FIG. 7 is a cross-sectional view of the essential parts of the conventional example.

In the figure, reference numeral 10 is a box-shaped shelf having an open front surface, which is composed of a shelf side plate 11, a lower plate, an upper plate 12 and a shelf rear plate 13, each of which is a metal plate. Guide grooves facing each other are provided on the lower surface of the upper plate and the upper surface of the lower plate of the shelf 10, and the backboard printed board 15 is attached at a position near the shelf rear plate 13.

By inserting the upper edge and the lower edge of the printed board 8 into the guide groove of the shelf 10 and plugging the connector mounted on the rear side edge into the connector mounted on the backboard printed board, a large number of printed boards 8 are formed. Are accommodated side by side in the shelf 10.

A printed board connector 9 for connecting to an external device is mounted near the front edge of at least one of the left and right printed boards 8. 20 is a front plate member 21 and 4
A front cover made of a shallow box-shaped metal plate including a frame edge member 22.

A cutout 25 is provided in the front cover 20 from the selected frame edge member 22 of the front cover 20 to the front plate member 21 by cutting and cutting a part thereof. Neck screws 29 are attached to the four corners of the front plate member 21 of the front cover 20.

The cable 7 connected to the external device from the front opening is drawn into the shelf 10 and the cable connector 7A is plugged into the printed board connector 9 to connect the external device to a predetermined printed board 8. .

Thereafter, the cable 7 is passed through the cutout 25, the front cover 20 is aligned with the front opening of the shelf 10, and the end face of the frame edge member 22 is brought into contact with the shelf edge frame 16,
In this state, the screw 29 with a neck is screwed into the screw hole of the shelf edge frame 16 to close the front opening of the shelf 10 with the front cover 20.

[0011]

By the way, it is difficult to completely bring the end faces of the frame edge members of the front cover into complete contact with the shelf edge frame without a gap in view of the accuracy of machining of the shelf and the front cover, and Due to the fact that the front cover was provided with a notch for introducing the cable,
There is a problem that noise is radiated to the outside of the shelf and adversely affects other electronic devices.

The present invention was created in view of the above points, and it is an object of the present invention to provide a printed board accommodating shelf in which unnecessary radio waves are not radiated.

[0013]

In order to achieve the above object, the present invention is a box in which a printed board is plugged in a backboard printed board to mount and accommodate a large number of printed boards in parallel and which has a shallow front opening. In a box-shaped shelf that is closed by a front cover of a shape, as shown in FIG.
A cable introduction hole 36 provided at a desired position of 31 and a flange 52 provided on each of the three side plate members of the square dish body 51 and the square dish body 51 having one side open,
By fixing 52 to the inner surface of the shelf side plate 31 in close contact, the square plate-shaped main body 51 is provided with a metal guide cover 50 that closes the front surface of the cable introduction hole 36, and the cable 7 is inserted through the cable introduction hole 36 to form a metal. The guide cover 50 is drawn in, introduced into the shelf through the opening 53 of the metal guide cover 50, and the cable connector 7A is plugged into the printed board connector 9 mounted on the printed board 8.

A front cover for closing the front of the shelf 30
40 is a shallow box-shaped cover main body 41 in which the end surface of the frame edge member 41A abuts on the shelf edge frame 32, a lower overlap plate 42 in close contact with the lower surface of the shelf lower plate, and an upper surface of the shelf upper plate. The upper overlap plate 43, the side overlap metal fitting 44 that is planted near one end in the cover body 41 and is inserted parallel to the inside of one shelf side plate 31, and the other end in the cover body 41. The front cover 40 has a structure in which the other side overlap fittings 45 are planted close to the other side and inserted in parallel with the inside of the other shelf side plate 31.
Shall be removably fixed to the shelf 30 by screw means.

Alternatively, a short-circuit leaf spring 60 that contacts the inner surface of the opposite shelf side plate 31 is attached to each of the side overlap fittings 44 and 45.

[0016]

According to the present invention, the cable introduction hole is provided in the shelf side plate, and the metal guide cover for covering the front portion of the cable introduction hole is attached inside the shelf side plate.

Therefore, since the path of noise leakage is complicated and long, noise radiation from the cable introduction hole is almost eliminated. Further, by providing the side overlap metal fittings and the upper and lower overlap plates on the front cover, the noise leakage path becomes complicated and long, so that the noise radiation from the front opening of the shelf is reduced.

Further, by providing the short-circuit leaf spring, noise radiation from the front opening of the shelf is almost eliminated.

[0019]

The present invention will be described in detail with reference to the drawings. The same reference numerals denote the same objects throughout the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of a metal guide cover, FIG. 3 is a perspective view of a front cover of the embodiment of the present invention, and FIG. 4 is a perspective view of a short-circuit leaf spring. Is.
In the figure, reference numeral 30 denotes a box-shaped shelf having an open front surface, which is composed of a shelf side plate 31, a lower plate, an upper plate, and a shelf rear plate 33 each made of a metal plate.

Guide grooves (not shown) facing each other are provided on the lower surface of the upper plate and the upper surface of the lower plate of the shelf 30, and the backboard printed board 15 is attached to a position near the shelf rear plate 33.

By inserting the upper and lower edges of the printed board 8 into the guide grooves of the shelf 30 and plugging the connector mounted on the rear edge into the connector mounted on the backboard printed board 15, a large number of printed boards can be obtained. 8 are accommodated in the shelf 30 side by side.

A printed board connector 9 for connecting to an external device is mounted near the front edge of at least one of the left and right printed boards 8. A cable introduction hole 36 is formed at a desired position of the shelf side plate 31 of the shelf 30.

Reference numeral 50 is a metal guide cover made of a metal plate, which is attached to the inside of the shelf side plate 31 so as to face the cable introduction hole 36. The metal guide cover 50, as shown in detail in FIG. 2, has a square dish-shaped body having an opening 53 on one side surface.
51, and a flange 52 formed by bending the three side plate members of the square dish-shaped body 51 outward.

This opening 53 connects the cable 7 to the printed board 8
It is an outlet for pulling out to the side. And this opening
A conductive rubber 55 is attached to the inside of 53 so as to be in close contact with the periphery of the cable 7.

After the cable 7 is drawn into the shelf 30 through the cable introduction hole 36, the cable 7 is bent so as to pass between the opening 53 and the shelf side plate 31, and the opening 53 becomes the front cover side, and the square plate body 51 is formed. The metal guide cover 50 so that it blocks the front of the cable introduction hole 36.
Align the flange 52 with the shelf side plate 31
The metal guide cover 50 is fixed to the shelf side plate 31 by closely contacting it to the inner side surface of the plate and fixing the flange 52 and the shelf side plate 31 with screws.

The cable connector 7A attached to the tip of the cable 7 is plugged into the printed board connector 9 mounted on the printed board 8. On the other hand, in the front cover 40 made of a metal plate that closes the front surface of the shelf 30, as shown in detail in FIG. 3, the end surface of the frame edge member 41A is the shelf edge frame 32.
A shallow box-shaped cover main body 41 that abuts against, a lower overlap plate 42 that closely contacts the lower surface of the shelf lower plate, an upper overlap plate 43 that closely contacts the upper surface of the shelf upper plate, and one end within the cover main body 41. Side overlap metal fittings 44 that are planted near the sides and are inserted parallel to the inside of one shelf side plate 31
And another side overlap fitting 45 that is planted near the other end in the cover body 41 and is inserted in parallel with the inside of the other shelf side plate 31.

The front cover 40 has screw head screws (neck screw 29 in FIG. 6) mounted at four corners of the cover body 41 screwed into the screw holes of the shelf edge frame 32, so that the end surface of the frame edge member 41A. Is affixed to the shelf 30 in a detachable manner while being in contact with the shelf edge frame 32.

Further, two pieces are provided on the outer surfaces of the side overlap fittings 44, 45, that is, on the surfaces facing the shelf side plates 31, respectively.
The short circuit leaf springs 60 are fixed. As shown in detail in FIG. 4, the short-circuit leaf spring 60 includes a rectangular plate-shaped seating plate portion 61, which is closely attached to the side overlap fitting and fixed by spot welding or screw means, and a tip of the seating plate portion 61. It is composed of several tongue pieces 62 which are bent in a U shape on the shelf side plate side and are cut at the tip thereof.

Therefore, when the front cover 40 is attached to the shelf 30, the side overlap metal fitting is inserted inside the shelf side plate, and the tongue piece 62 of the short-circuit leaf spring 60 is pressed against the inner surface of the shelf side plate 31.

The present invention, as described above, uses the cable introduction hole 36.
The metal guide cover 50 is attached to the portion, the side cover metal fittings 44 and 45 and the upper and lower overlap plates are provided on the front cover 40, and the short-circuit leaf spring 60 is attached to the side overlap metal fitting, so that the cable introduction hole 36 The path of noise leakage in the part becomes complicated and long, and the path of noise leakage becomes complicated and long from the gap between the front cover and the shelf frame, so that noise radiation from the shelf is almost eliminated.

[0032]

As described above, according to the present invention, the cable introduction hole is provided in the shelf side plate, and the metal guide cover for covering the front part of the cable introduction hole is attached to the inside of the shelf side plate. It has an effect that the noise radiation from is almost eliminated.

Further, the side cover metal fittings and the upper and lower overlapping plates are provided on the front cover, and the short-circuit leaf springs are attached to the side overlap metal fittings, so that there is almost no noise radiation from the front opening of the shelf. It has an excellent effect on the above.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of a metal guide cover.

FIG. 3 is a perspective view of a front cover according to an embodiment of the present invention.

FIG. 4 is a perspective view of a short-circuit leaf spring.

FIG. 5 is a front view of the video conference device.

FIG. 6 is a view of a conventional example, (A) is a perspective view of a shelf, and (B) is a perspective view of a front cover.

FIG. 7 is a sectional view of a key part of a conventional example.

[Explanation of symbols]

7 cables, 7A cable connector 8 printed board 9 printed board connector 10,30 shelf 11,31 shelf side board 15 backboard printed board 20,40 front cover 16,32 shelf edge frame 13,33 shelf back board 36 cable introduction hole 41 cover Body 42 Lower overlap plate 43 Upper overlap plate 44,45 Side overlap metal fitting 50 Metal guide cover 51 Square plate body 55 Conductive rubber 60 Short-circuit leaf spring

Claims (3)

[Claims] 1. A box-shaped shelf in which a printed board is plugged into a backboard printed board, a large number of printed boards are mounted and accommodated in parallel, and a front opening is closed by a shallow box-shaped front cover. 31) Cable introduction hole provided at the desired position
(36), and a square dish-shaped body (51) having an opening on one side and the square dish-shaped body
(51) consisting of a flange (52) provided on each of the three side plate members, and by closely fixing the flange (52) to the inner side surface of the shelf side plate (31), the rectangular dish body (51) And a metal guide cover (50) for closing the front surface of the cable introduction hole (36), and the cable (7) is drawn into the metal guide cover (50) through the cable introduction hole (36), Guide cover (50)
The cable connector (7A) is introduced into the shelf through the opening (53), and is configured to be plugged into the printed board connector (9) mounted on the printed board (8). Structure of printed board storage shelf. 2. A front cover (4) for closing the front of the shelf (30).
0), the end surface of the frame edge member (41A) contacts the shelf edge frame (32),
Shallow box-shaped cover body (41) and lower overlap plate (42) that closely contacts the lower surface of the shelf lower plate
And an upper overlap plate (43) that closely adheres to the top of the shelf top plate
And a side overlap metal fitting (44) which is planted near one end in the cover body (41) and is inserted parallel to the inside of one shelf side plate (31), and the cover body (41) The other side overlap metal fitting (45) which is planted near the other end of the shelf and is inserted in parallel with the inside of the other side plate (31) of the shelf. 2. The structure of a printed board storage shelf according to claim 1, wherein the structure is detachably fixed to the (30) by screw means. 3. A short-circuit leaf spring (60) contacting the inner surface of the opposite shelf side plate (31) is attached to each side overlap fitting (44, 45) according to claim 2. Structure of printed board storage shelf.