JP5007208B2 - Electronic equipment grounding structure - Google Patents

Description

  The present invention relates to a ground structure for an electronic device such as a wireless communication device.

Conventionally, some electronic devices such as wireless communication devices have a plurality of units mounted in a housing called a shelf.
Since such an electronic device employs a structure in which a plurality of units are mounted in the housing from the front of the housing, the unit-side electrical circuit and the housing-side electrical circuit are connected to the back of the unit. A backboard and connectors are provided.
On the other hand, in the electronic device having the above structure, in order to stably operate the unit mounted on the housing, it is necessary to reliably conduct the ground of the electric circuit provided on the unit side to the ground on the housing side.
In particular, in an electronic device in which a high-frequency amplifier circuit or the like is provided in the unit, it is important that the unit-side ground and the housing-side ground are securely connected.

For this reason, for example, Patent Document 1 proposes a guide rail structure capable of stably grounding the electronic device unit and the subrack.
In the guide rail structure of Patent Document 1, an earth plate made of an elastic body is provided on a guide rail made of resin, and the earth plate is curved in a substantially arcuate shape.
Also, the guide rail is provided with a protrusion. By fitting this protrusion into the hole on the subrack side, the guide rail is attached to the subrack, and the electronic device unit is inserted from the front side of the subrack. Then, the ground plate is elastically brought into contact with the upper and lower surfaces of the electronic device unit so that the ground on the electronic device unit side and the ground on the subrack side are conducted.

And, when mounting the electronic device unit on the subrack with the above configuration, the contact portion is not damaged by the resin guide rail or metal powder is not generated. By providing a slit in the contact point, it is possible to increase the contact point between the electronic device unit and the earth plate.
JP 2002-26545 A

However, the guide rail structure described in Patent Document 1 has the following problems.
In other words, because the guide rail is made of resin, no metal powder is generated from the guide rail even if the guide rail is worn, but the ground plate is made of a metal plate and Because of the structure in sliding contact with the upper and lower surfaces of the equipment unit, the ground plate may be worn and metal powder may be generated from the ground plate.
In addition, since the ground plate and the electronic device unit are connected only by the elasticity of the ground plate, if the elasticity of the ground plate is weak, the continuity becomes unstable, and conversely if too strong, the contact surface pressure with the unit increases and the unit There is a problem in that metal wear of the ground plate increases when removing and attaching the metal, and as a result, metal powder that causes failure is likely to be generated.
The present invention has been made to remedy such a problem, and it is intended to provide an electronic device grounding structure that does not generate metal powder that causes a failure and that can reliably conduct grounding between the unit and the housing. It is the purpose.

  The ground structure of an electronic device according to the present invention is a ground structure of an electronic device in which a plurality of units are detachably mounted in a housing of an electronic device body, and is a unit that is laid in the housing and is inserted and removed. A guide rail made of resin that guides the unit, a ground rail that is supported in a vertically movable manner below the unit mounted in the casing, and has a contact member made of a metal elastic body on the upper surface, and the unit in the casing It is provided in the vicinity of the fixing tool to be fixed, and is composed of a pushing-up means for pushing up the earth rail by pressing the fastening tool to press the contact member against the unit and electrically connecting the unit and the housing.

With the above configuration, when the unit is mounted on the housing, the contact member that is separated from the bottom surface of the case is pressed against the case by tightening the fixing tool, and the unit-side ground and the housing-side ground are electrically connected. Therefore, the ground on the unit side and the ground on the housing side can be reliably conducted, so that the functional components in the unit can be operated in a stable state, and the influence of electromagnetic waves generated in other units can be reduced. Can be reduced.
In addition, when the unit is attached to and detached from the housing, the case and the guide rail, and the case and the contact member do not come into metal contact, so that it is possible to reliably prevent the generation of metal powder that causes a failure.

  In the ground structure of the electronic device according to the present invention, the push-up means includes a ground block that is in contact with an inclined surface formed at the end of the ground rail and is supported by the horizontal pin so as to be movable in the horizontal direction. The fixing tool is configured to press in the direction in which the ground rail is pushed up, and biasing means for biasing the ground block in the direction in which the unit is pulled out.

  With the above configuration, the contact member can be brought into contact with the bottom surface of the case almost uniformly, so that the electrical circuit on the unit side can be reliably conducted to the electrical circuit on the housing 2 side, thereby being provided in the unit. Further, the operation of the functional parts can be further stabilized, and the influence of electromagnetic waves generated from other units can be further reduced.

  According to the grounding structure of the electronic device of the present invention, when the unit is mounted on the housing, the contact member that is separated from the bottom surface of the case is pressed against the case by tightening the fixing tool and is grounded on the unit side. Since the ground on the housing side is connected to the ground on the unit side, the ground on the unit side and the ground on the housing side can be surely conducted, so that the functional components in the unit can be operated in a stable state, and other units Can reduce the influence of electromagnetic waves and the like generated by the.

Embodiments of the present invention will be described in detail with reference to the drawings.
1 is a front view of an electronic device comprising a wireless communication device, FIG. 2 is an enlarged front view of a unit portion, FIG. 3 is a side view thereof, FIG. 4 is an enlarged front view of a ground structure, and FIG.
An electronic device main body 1 shown in FIG. 1 includes a housing 2 and a plurality of units 3 mounted in the housing 2.
The casing 2 is formed of a vertically long rectangular body having an opening 2a on the entire surface, and is entirely formed of a metal molded body. A plurality of shelves 2b are provided in the vertical direction inside.
A front panel 4 is detachably attached to the front opening 2a of the housing 2 for each step by a fixing tool 5 such as a screw. An operation means 6 such as a dial is provided on the uppermost front panel 4. The second-stage front panel 4 has, for example, a meter 7, the third-stage front panel 4 has, for example, a plurality of units 3, and the lowermost-stage front panel 4 has a net, for example, to block the vent 4 a. A body 8 is attached.

As shown in FIGS. 2 and 3, the unit 3 attached to the front panel 4 at the third stage from the top has a unit panel 3a having a slightly larger area than the mounting opening 4b opened in the front panel 4. The front end surface of the case 3b is attached to the back surface of the unit panel 3a.
The case 3b is entirely formed in a box shape with a metal plate, and houses therein a functional component 18 such as a high frequency amplifier, and an opening 3c opened on the side surface of the case 3b is a detachable cover. It is closed by 3d.
A box-shaped connecting means 9 provided with a backboard, a connector and the like is attached to the back surface of the case 3b. When the unit 3 is mounted in the casing 2, the connecting means provided on the casing 2 side. The connecting means 9 on the unit 3 side is fitted to (not shown) so that the electric circuit on the unit 3 side and the electric circuit on the housing 2 side are connected.

The case 3 b of the unit 3 is formed in an elongated rectangular shape in the insertion / removal direction A of the unit 3, and the case 3 b of the unit 3 is inserted into the housing 2 from the mounting opening 4 b opened in the front panel 4. At this time, a pair of guide rails 10 are laid in the insertion / removal direction A of the unit 3 on the upper surface of the shelf 2b in order to prevent the bottom surface of the case 3b from slidingly contacting the upper surface of the shelf 2b.
The guide rail 10 is formed in a L-shaped cross section as shown in FIG. 4 with a resin having lubricity, for example, a Teflon (registered trademark) resin, and is separated in the width direction of the housing 2 and is parallel to each other. By fitting the corners on both sides of the bottom portion of the case 3b to the stepped portions 10a facing each other, the unit 3 can be smoothly put in and out of the housing 2 and at the same time the case 3b The bottom surface and the top surface of the shelf 2b are prevented from sliding.

On the other hand, on the shelf 2b that supports the unit 3 from below, one or more openings 2c that are elongated in the front-rear direction are opened along the guide rail 10, and a ground rail 12 is provided in these openings 2c. ing.
The earth rail 12 is formed by bending a metal plate, and a plurality of long holes 12a are formed in an oblique direction before and after both side surfaces.
These long holes 12a are fitted with guide pins 13 projecting horizontally from the shelf 2b side, and supported by these guide pins 13 so that the ground rail 12 can move up and down while maintaining the horizontal state. The contact member 14 is provided on the upper surface of the guide rail 10 in the unit insertion / removal direction A.
The contact member 14 electrically connects the bottom surface of the case 3 b of the unit 3 and the ground rail 12. For example, a leaf spring formed in a substantially corrugated shape is used, and the contact member 14 is provided so as to protrude upward from the upper surface of the guide rail 10. The plurality of protrusions 14a are elastically in contact with the bottom surface of the case 3b.

In addition, inclined surfaces 12b and 12c are formed at the front and rear end portions of the guide rail 10 by bending the end portions in opposite directions, and the inclined surface 15b of the ground block 15a of the push-up means 15 is formed on the front inclined surface 12b. The inclined guide 2d formed by bending from the shelf 2b is in contact with the rear inclined surface 12c.
The push-up means 15 pushes up the earth rail 12 supported on the shelf 2b through the guide pins 13 so as to be movable up and down while maintaining the horizontal state. The push-up means 15 projects horizontally from the front surface of the shelf 2b. An earth block 15a made of metal is supported on the pin 15c so as to be movable back and forth.
An urging means 15d such as a coil spring for urging the ground block 15a forward, that is, in the pulling-out direction of the unit 3 is fitted to the tip of the horizontal pin 15c. The front end of a fixing tool 16 made of a screw or the like for fixing the panel 3a to the front surface of the shelf 2b is in contact.
The fixing tool 16 is screwed into a screw hole 2d formed on the front surface of the shelf 2b. When the fixing tool 16 is tightened to fix the unit panel 3a to the front panel 4, the tip of the fixing tool 16 is moved. The ground block 15a is pressed backward against the biasing means 15d.

Next, the operation of the ground structure of the electronic device constructed as described above will be described.
In the case 3 b of the unit 3, functional components 18 for performing wireless communication and the like are accommodated as shown in FIG. 4, and these components can be operated in a stable state, In order not to be affected by the generated electromagnetic wave or the like, it is necessary to reliably connect the ground on the unit 3 side and the ground on the housing 2 side.
In mounting the unit 3 in the housing 2, the rear portion of the case 3b of the unit 3 is inserted from the mounting port 4b of the front panel 4 covering the front opening 2a of the housing 2, and at this time, the both sides of the bottom portion of the case 3b are inserted. The corner 3 is fitted to the step portion 10a of each guide rail 10, and the bottom of the case 3b of the unit 3 is guided to the guide rail 10 by pushing the unit 3 in this state. Can be easily inserted.

Further, since the guide rail 10 is formed of a resin having slipperiness, the case 3b does not come into metal contact with the shelf 2b or the like, and the ground rail 15 has its own weight until the contact member 14 does not come into contact with the bottom surface of the case 3b. Because of this, the bottom surface of the case 3b and the contact member 14 do not make metal contact, so that when the unit 3 is mounted in the housing 2, no metal powder that causes a failure is generated. .
After the unit 3 is mounted in the housing 2, in order to attach the unit panel 3a to the front panel 4 with the fixing tool 16, the fixing tool 16 is screwed into a screw hole 2d formed on the front surface of the shelf board 2b and tightened. When the tip of the fixing tool 16 near the push-up means 15 comes into contact with the ground block 15b of the push-up means 15 as shown in FIG. 5, the ground block 15b is pushed backward.

As a result, the inclined surface 15b of the earth block 15 is pressed against the inclined guide 2c by the inclined surface 15b of the earth rail 15 pressing the inclined surface 12b formed on the front end surface of the earth rail 12. While the inclined long holes 12a formed on both sides of the ground rail 12 are guided by the guide pins 13, the ground rail 12 is pushed up while maintaining the horizontal state as shown in FIG. The protrusion 14a of the contact member 14 protruding from the upper surface of the ground rail 12 is elastically pressed against the bottom surface of the case 4b, and the case 4b and the ground rail 15 are electrically connected.
That is, when the unit 3 is mounted on the housing 2, the contact member 14 that is separated from the bottom surface of the case 3 b is pressed against the bottom surface of the case 3 b by tightening the fixing tool 16, so that the ground and housing on the unit 3 side are connected. When the unit 3 is mounted on the housing 2, the case 3 b and the contact member 14 do not come into metal contact with each other, so that it is possible to reliably prevent the generation of metal powder that causes failure. be able to.

On the other hand, when the unit 3 is removed from the housing 2 for maintenance or replacement with another unit 3, the grounding block 15b is attached to the unit 3 by the biasing means 15d when the fixing member 16 that fixes the unit panel 3a is first removed. Therefore, the earth rail 12 is lowered by its own weight, and the contact member 14 is separated from the bottom surface of the case 3b.
Next, when the unit 3 is extracted from the housing 2 in this state, the case 3b and the contact member 14 do not come into metal contact, so that metal powder is generated when the unit 3 is removed from the housing 2. There is nothing.
Further, after the unit 3 is mounted in the housing 2, the grounding rail 12 is pushed up by the push-up means 15 so that the contact member 14 is pressed against the bottom surface of the case 3b, so that the contact member 14 is almost uniformly placed on the bottom surface of the case 3b. Therefore, the electrical circuit on the unit 3 side can be reliably conducted to the electrical circuit on the housing 2 side, thereby stabilizing the operation of the functional component provided in the unit 3. In addition, the influence of electromagnetic waves generated from the other units 3 can be reduced.

It is a front view of the electronic device which employ | adopted the earth structure which becomes embodiment of this invention. It is an enlarged front view of the unit mounted in the housing | casing of the electronic device which employ | adopted the earth structure which becomes embodiment of this invention. It is an expanded side view of the unit mounted in the housing | casing of the electronic device which employ | adopted the earth structure which becomes embodiment of this invention. It is an enlarged front view which shows the earth structure of the electronic device which becomes embodiment of this invention. It is an enlarged side view which shows the earth structure of the electronic device which becomes embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic device main body 2 Case 3 Unit 10 Guide rail 12 Ground rail 12b Inclined surface 14 Contact member 15 Push-up means 15a Ground block 15b Inclined surface 15c Horizontal pin 15d Energizing means 16 Fixing tool

Claims (2)

  A grounding structure of an electronic device in which a plurality of units are detachably mounted in a housing of the electronic device main body, the guide being made of a resin that is laid in the housing and guides the unit when the unit is inserted and removed A rail, a ground rail that is supported in a vertically movable manner below the unit mounted in the housing, and provided with a contact member made of a metal elastic body on the upper surface, and an adhesive that fixes the unit to the housing And a push-up means that is provided in the vicinity of a tool and pushes up the ground rail by pressing the fixing tool to press-contact the contact member against the unit, thereby electrically connecting the unit and the housing. A grounding structure for electronic equipment.   The push-up means is in contact with an inclined surface formed at an end of the earth rail and is supported by a horizontal pin so as to be movable in the horizontal direction, and the earth block is pushed in the push-up direction of the earth rail. The earth structure of the electronic device according to claim 1, wherein the earthing structure of the electronic device is constituted by a fixing tool to be pressed and an urging means for urging the earth block in a direction in which the unit is pulled out.

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