JP2942918B2 - Structure of electronic circuit package board and rack unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electronic circuit package board and a rack unit in an electronic device unit for preventing noise, static electricity and the like which may be emitted from the outside or the electronic device itself. Things.

[0002]

2. Description of the Related Art In an electronic apparatus, a printed circuit board (electronic circuit package board) on which an electronic circuit is mounted is mounted, for example, on a bookshelf. The object is achieved by arranging and operating the insertion / extraction lever at the end of the printed circuit board. Unless there is a particular problem, a resin molded product sufficiently performs its function and is inexpensive, so it is widely used.

[0003] With the recent trend toward higher performance and higher functionality of electronic devices, there has been a problem of influence on the electronic devices caused by electromagnetic waves radiated by the electronic devices themselves or attracted from the outside of the electronic devices. One of the important issues in the development of electronic devices is how to reduce the emission or attraction of light.

In order to take measures against electromagnetic interference, if the entire device is shielded with a metal shell without any gap, the intended purpose can be achieved, but the assemblability, expandability and maintainability of the electronic device are improved. Considering that, it is not preferable to cover the entire device with a metal shell. Therefore, the shielding structure takes into account the above-mentioned ease of access to the electronic device, and an optimal structure is selected among them.

[0005] In a method of preventing electromagnetic interference, which is mainly used for bookshelf mounting and adds a function of a shielding effect, a material of an insertion / extraction lever is formed of a conductive resin or a metal. It comes in contact with the contact piece provided on the frame, and the insertion / extraction lever and the metal front plate are connected via the ground wiring pattern on the electronic circuit package board,
The intended purpose of the shield effect can be achieved.
As a result, it becomes possible for the electronic device unit to maintain the same ease of handling as the structure of the electronic circuit package board having no shielding effect.

[0006]

In the above-described shield configuration for preventing electromagnetic interference, if the insertion / extraction lever is made of a conductive resin, there is a concern that the strength of the insertion / extraction lever during operation of the insertion / extraction lever may be limited due to the mixture. You. In the case of conductive resin, it is expected that the shielding effect is inferior to that of metal. Further, in order to use the above-mentioned insertion / extraction lever which can be regarded as a semi-rigid body, it is necessary to provide an elastic contact piece on the rack unit side of the electronic device. In the above-described method, it is not easy to take measures against electromagnetic interference on the premise that an existing rack unit is used, and a large modification of the rack unit is required, and the cost for that is increased.

In the method of once dropping the frame ground to the wiring pattern on the package board and connecting to the front plate through the wiring pattern, the same solder plating as the component mounting part is used for plating the contact part of the wiring pattern. If it is applied, there is a possibility that a contact failure due to solder creep may occur, and there is a concern about long-term reliability in connection with the front plate. If the type of plating is changed, improvement in reliability can be expected, but the process becomes complicated and cost increases.

According to the present invention, a metal plate is mounted on the front surface of an insertion / extraction lever on a package board to overcome the above-mentioned drawbacks, and the metal plate, the metal front plate of the package board and the unit frame are electrically connected. Incorporating a metal piece to be connected and using a configuration that connects to the frame ground, simply replacing the front and rear plates with the insertion / extraction levers on the currently used electronic equipment rack unit and electronic circuit package board provides the same shielding effect as before. The purpose is to demonstrate.

[0009]

According to the present invention, a metal plate is attached to a front surface of a resin insertion / extraction lever on a package board, and a metal front plate and a rack unit frame are arranged on the metal plate and the package board. Incorporate a piece of metal that electrically connects the Alternatively, a metal piece that electrically connects a metal front plate and a rack unit frame arranged on a package board is incorporated in a metal insertion / extraction lever. The method of connecting to the frame ground by using these insertion / extraction lever assemblies is used to reduce the effects of external noise, static electricity, etc., or the electromagnetic waves, noise, etc. emitted by the electronic device itself.

That is, according to the present invention, in a rack unit for housing an electronic device and an electronic circuit package board incorporated in the rack unit, a metal front plate is provided on the electronic circuit package board. An insertion / extraction lever is attached to the electronic circuit package board, and the insertion / extraction lever has a front plate side contact that contacts the front plate and a unit frame side contact that contacts the rack unit. An elastic metal piece that electrically connects to the rack unit is detachably incorporated,
The front plate, the insertion / extraction lever, and the rack unit
Is elastically connected by the elastic metal piece, and by the operation of the insertion / extraction lever, after the incorporation of the electronic circuit package board into the rack unit is completed, the front plate and the rack unit are electrically connected to each other. By connecting the unit to a frame ground, the structure of the electronic circuit package board and the rack unit, wherein the shielding effect of the entire rack unit is improved, is obtained.

According to the present invention, there is provided an insertion / extraction lever having a metal plate attached to a front surface used for an electronic circuit package board incorporated in a rack unit accommodating an electronic device. It has a front plate side contact that contacts a metal front plate provided on a circuit package board, and a unit frame side contact that contacts the rack unit, and electrically connects the front plate and the rack unit. An elastic metal piece is removably incorporated into the front plate, the insertion / extraction lever, and the rack unit.
The elasticity is improved by the elastic metal piece, and the metal plate, the front plate, and the elastic metal piece are connected to a frame ground to improve the shielding effect of the entire rack unit. The structure of the electronic circuit package board and the rack unit is obtained.

Still further, according to the present invention, the body of an insertion / extraction lever used for an electronic circuit package board incorporated in a rack unit accommodating an electronic device is made of metal, and the electronic circuit package is attached to the insertion / extraction lever. An elastic metal that has a front plate side contact that contacts a metal front plate provided on a board and a unit frame side contact that contacts the rack unit and electrically connects the front plate and the rack unit. piece is incorporated into detachable, the positive
The face plate, the insertion / extraction lever, and the rack unit are
An electronic circuit package having an improved shielding effect of the entire rack unit by being elastically connected by an elastic metal piece and connecting the main body of the insertion / extraction lever, the front plate and the elastic metal piece to a frame ground; The structure of the board and the rack unit is obtained.

Further, according to the present invention, there is provided an insertion / extraction lever assembly characterized in that the electromagnetic shielding effect is improved by replacing parts of an existing unit. Still further, according to the present invention, by forming the metal plate and the metal piece having a contact point to the metal plate into a two-piece structure, when one of the two metal pieces is damaged, the insertion / extraction lever body can be replaced. Instead, the insertion / extraction lever assembly is characterized in that the function of the metal piece before the breakage is restored by replacing the built-in metal piece.

Further, according to the present invention, the contact portion which comes into contact with the metal plate is divided into two parts and the tips of the beams constituting the contact portion are connected to improve the reliability at the time of contact. An insertion / extraction lever assembly having a structure for preventing deformation or the like during assembly of the lever assembly is obtained.

[0015]

[0016]

The present invention reduces the effects of external noise, static electricity, etc., or the electromagnetic waves emitted by the electronic device itself by taking the above-described method, and at the same time reduces the existing insertion / extraction operation mechanism of the electronic device. By replacing the components of the package board, that is, the insertion / extraction lever assembly, it is possible to maintain the same insertion / extraction operation as before.

[0017]

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

One embodiment of the present invention is shown in FIGS.
FIG. 1 is a partially cutaway perspective view of an electronic circuit unit, and FIG.
FIG. 3 is a perspective view of the insertion / extraction lever assembly according to claim 1 of the present invention in which a shield measure has been taken, and FIG. 4 is a perspective view of the insert / extract lever assembly in which the electronic circuit package board has been incorporated in the unit. FIG. 5 is a perspective view of the insertion / extraction lever assembly of FIG. 1 viewed from the contact side of the front plate, and FIG. FIG. 6 is a cross-sectional view taken along the line AA of FIG. 2 to show how the metal piece according to the embodiment of the present invention is incorporated.

In FIG. 1, reference numeral 1 denotes a rack unit such as an electronic communication device, which is made of metal. The rack unit 1 has a hollow rectangular parallelepiped shape including an opening and a backboard 2 forming a bottom. A plurality of receptacle connectors 3 are provided on the back board 2. Guide rails 4 are provided on upper and lower plates of the rack unit 1 so as to correspond to the receptacle connectors 3 on the backboard 2. The package board 5 has electronic components 9 mounted thereon, and a plug connector 6 is provided at an end on the insertion side indicated by an arrow in FIG.
Reference numeral 8 denotes an insertion / extraction lever assembly, which is inserted using a lever to reduce the insertion force and the extraction force of the plurality of plug connectors 6 when the package board 5 is inserted into or detached from the rack unit 1. In addition, it has a mechanism for fixing the insertion / extraction lever, and when the insertion is completed, it is locked. Reference numeral 10 denotes a front plate, which is made of metal, and is electrically connected to the rack unit 1 in order to reduce the influence of static electricity or noise when the package board 5 is installed in the rack unit 1.

In FIG. 2, a metal plate is attached to the front surface of the insertion / extraction lever 8, and the metal plate is a metal piece 14 (FIG. 8) in which the unit frame side contact 12 and the front plate side contact 13 are integrally formed. Reference). The front plate side contact 13 is in contact with the front plate 10 arranged on the package board 5 as shown in FIG. With the above configuration, the rack unit 1 that houses the electronic device, the front plate 10 provided on the package board 5, and the insertion / extraction lever assembly are electrically connected.

In the embodiment, the invention described in claim 1 has been described in detail for the insertion / extraction lever. However, as in the invention described in claim 2, a metal plate is attached to the front surface of the insertion / extraction lever. There is no problem if the insertion / extraction lever is made of metal and the insertion / extraction lever incorporating the contact having the above-mentioned contact is constructed. Unit frame side contacts and front plate side contacts
It can also be formed in one piece. In addition, a method of performing surface treatment on the insertion / extraction lever 8 and the lock 11 to achieve conduction is also conceivable. Further, it is more preferable that the lock 11 be provided with a contact point and connected to the front plate 10.

As shown in FIG. 5, the beam is divided into two beams at the contact portion 12 of a metal piece that comes into contact with the rack unit and is incorporated in the insertion / extraction lever assembly of the present invention. Furthermore, since the beam ends are connected, it contributes to improvement of contact reliability and prevention of deformation at the time of assembling and removing the lever assembly.

FIG. 7 is a partially cutaway perspective view showing the state of assembling the metal piece of the above embodiment. FIG. 8 is a partially broken perspective view showing the disassembled state of the insertion / extraction lever main body and the metal piece of the above embodiment.

In FIG. 8, when the metal piece 14 of the insertion / extraction lever assembly is assembled into the insertion / extraction lever assembly, the metal piece 14 of the insertion / extraction lever body is placed at a predetermined position over the step 16 of the metal piece housing portion. The metal piece 14 in this position does not come off during the normal operation of the insertion / extraction lever assembly, as shown in FIG.
If the metal piece 14 is damaged for some reason, the metal piece 14 can be easily replaced as shown in FIG.

[0025]

As described above, according to the present invention, the insertion / extraction lever or the all-metal insertion / extraction lever having a metal plate mounted on the front surface thereof is provided on the package board. A structure is used in which a metal piece for electrically connecting the board metal front plate and the metal unit frame is incorporated and connected to the frame ground.

Therefore, the shielding effect can be improved only by replacing the components on the package board with the currently used rack unit as it is.

Further, since the signal ground and the frame ground can be separately obtained, malfunction or destruction of the electronic components on the package board can be prevented, and the reliability of the electronic device is improved.

Further, depending on the shape of the metal piece incorporated in the insertion / extraction lever and the shape of the insertion / extraction lever body, if the metal piece is damaged, it can be easily replaced, and the function before the damage can be restored.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of an electronic circuit unit according to an embodiment of the present invention.

FIG. 2 is a state diagram when the package board of one embodiment of the present invention is incorporated in a unit.

FIG. 3 is a perspective view of an insertion / extraction lever assembly with a shield measure according to an embodiment of the present invention.

FIG. 4 is a perspective view of the insertion / extraction lever assembly with a shield measure, viewed from the front plate side contact, according to the embodiment of the present invention.

FIG. 5 is a perspective view of the insertion / extraction lever assembly with a shield measure, viewed from the unit side contact, according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view taken along the line AA of FIG. 2, showing a state of assembling a metal piece according to the embodiment of the present invention.

FIG. 7 is a partially cutaway perspective view showing a state of assembling a metal piece according to the embodiment of the present invention.

FIG. 8 is a partially broken perspective view showing a disassembled state of the insertion / extraction lever main body and the metal piece according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rack unit 2 Backboard 3 Receptacle connector 4 Guide rail 5 Package board 6 Plug connector 7 Slot 8 Insertion / extraction lever 9 Electronic component 10 Front plate 11 Lock 12 Unit frame side contact 13 Front plate side contact 14 Metal piece 15 Lock of contact piece Projection 16 Step of metal piece storage part

──────────────────────────────────────────────────続 き Continuing from the front page (72) Kazufumi Kamata, 1-5-5, Kiyonobukuro, Hirosaki-shi, Aomori Prefecture Inside Hirosaki Aviation Electronics Co., Ltd. (72) Inventor Toru Kishimoto 3-19 Nishishinjuku, Shinjuku-ku, Tokyo No. 2 Within Nippon Telegraph and Telephone Corporation (72) Katsumi Kaizu Inventor, Nippon Telegraph and Telephone Corporation 3-9-1, Nishishinjuku 3-chome, Shinjuku-ku, Tokyo (56) References JP-A-7-142884 (JP, A) JP-A-7-176879 (JP, A) JP-A-60-103893 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H05K 7/14 H05K 9/00

Claims (6)

(57) [Claims] A rack unit accommodating an electronic device;
In the electronic circuit package board incorporated in the rack unit, a metal front plate is provided on the electronic circuit package board, and an insertion / extraction lever is attached to the electronic circuit package board. elastic metal piece for electrically connecting integrated into removably with said rack unit and said front plate and a unit frame side contacts that contact with the front plate side contact that contacts the front plate to said rack unit, wherein Front plate and insertion and removal
The lever and the rack unit are connected by the elastic metal piece.
After the assembly of the electronic circuit package board into the rack unit is completed by the operation of the insertion / extraction lever, the front plate and the rack unit are electrically connected, and the rack unit is connected to a frame ground. A structure of the electronic circuit package board and the rack unit, wherein the shielding effect of the entire rack unit is improved. 2. An insertion / extraction lever having a metal plate attached to a front surface used for an electronic circuit package board incorporated in a rack unit accommodating an electronic device, wherein the insertion / extraction lever is provided on the electronic circuit package board. An elastic metal piece that has a front plate side contact that contacts the metal front plate and a unit frame side contact that contacts the rack unit and that electrically connects the front plate and the rack unit is removable. built into the front plate and the front
The insertion / extraction lever and the rack unit are provided with the elastic metal
An electronic circuit package board and a rack unit , wherein the metal plate, the front plate, and the elastic metal piece are connected to a frame ground to improve a shielding effect of the entire rack unit. Structure. 3. A main body of an insertion / extraction lever used for an electronic circuit package board incorporated in a rack unit accommodating an electronic device is made of metal, and the insertion / extraction lever is provided with a metal provided on the electronic circuit package board. An elastic metal piece having a front plate side contact in contact with a front plate made of a metal and a unit frame side contact in contact with the rack unit and electrically connecting the front plate and the rack unit is removed.
Freely assembled, the front plate, the insertion / extraction lever and the
The rack unit is elastically connected by the elastic metal piece.
Is, the body of the insertion levers, the front plate and the structure of the elastic metal piece electronic circuit package board and a rack unit, characterized in that to improve the shielding effect of the entire rack unit by being connected to the frame ground . 4. The insertion / extraction lever assembly according to claim 1, wherein an electromagnetic shielding effect is improved by replacing parts of an existing unit. 5. A two-piece structure of a metal plate and a metal piece having a contact point to the metal plate, so that when one of the two metal pieces is damaged, the insertion / extraction lever body is not replaced.
The function before damage of the metal piece is restored by replacing the built-in metal piece.
Or the insertion / extraction lever assembly according to 3. 6. The contact part in contact with the metal plate is divided into two parts, and the tip of the beam forming the contact part is connected to improve the reliability at the time of contact and the deformation at the time of assembling the lever assembly. 4. An insertion / extraction lever assembly according to claim 1, wherein the lever has a structure for preventing the insertion / extraction.