JP5557764B2 - Electromagnetic shield structure - Google Patents

Description

  The present invention relates to an electromagnetic shield structure using a substrate panel and a gasket in a sub-rack of a communication device, and relates to prevention of gasket peeling and damage when the substrate is inserted.

In general, a communication device uses a sub-rack in which a plurality of substrates are arranged in parallel and inserted into a slot provided in a rectangular opening in order to store a substrate on which electronic components and circuits are mounted with high density. In order to perform electromagnetic shielding at the subrack opening, a panel having a substantially U-shaped cross section having conductivity is attached to the front surface of the substrate.
A gasket having conductivity and elasticity is attached to one side surface portion of the panel. A gasket is also attached to one inner surface of the subrack.

  When a board (insertion board) with a panel as described above is inserted into the subrack, the board (adjacent to the gasket mounting surface of the insertion board) that is already inserted into the adjacent slot (adjacent to the gasket pressing face) Substrate) gasket or subrack gasket is compressed and pressed. The gasket of the insertion board is compressed and pressed against the gasket pressing surface of the adjacent board or the inner side surface of the subrack. Thereby, the electrical contact between each panel and the sub-rack is taken to constitute an electromagnetic shield.

  However, in the above structure, the gasket mounting direction and the substrate insertion direction are orthogonal. Further, the width dimension of the panel (the width dimension from the gasket pressing surface to the gasket tip) is larger than the width dimension assigned to one substrate in the subrack. Therefore, when inserting the board, the gasket pressing surface of the insertion board hits the base of the gasket of the adjacent board, and part of the board insertion force is converted into a force to peel off the gasket, and the gasket is peeled off from the panel. There was a problem that there is a risk of damage.

  On the other hand, there is one in which a gasket mounting surface can be slid in a direction perpendicular to the substrate insertion direction by a thumb screw (see, for example, Patent Document 1). In the method disclosed in Patent Document 1, first, before inserting the substrate, the thumbscrew is loosened to move the gasket mounting surface to the inside of the panel. This prevents the gasket pressing surface of the insertion substrate from coming into contact with the gasket of the adjacent substrate or the subrack gasket. Then, after inserting the substrate, the gasket mounting surface is moved to the outside of the panel, and the thumbscrews are fastened and fixed to obtain electrical contact. Thereby, gasket peeling and damage can be prevented.

JP 2001-168572 A

  However, in the method disclosed in Patent Document 1, since the gasket mounting surface is divided from the panel so as to be slidable, the number of parts increases, and the parts manufacturing cost and board assembly cost increase. There is. In addition to the substrate insertion, a separate slide operation for contacting the gasket is necessary, which increases the cost of substrate insertion operation into the subrack. Furthermore, there is a problem that the subrack gasket cannot be peeled off or damaged.

  The present invention has been made to solve the above-described problems, and can reduce the number of components and the cost, and can prevent the panel and the subrack from being peeled or damaged when the board is inserted. An object is to provide an electromagnetic shield structure.

The electromagnetic shield structure according to the present invention includes a subrack into which a plurality of substrates are inserted, a front part that is attached to the substrate and is positioned on the subrack opening side when the substrate is inserted into the subrack, and a substrate surface. An electrically conductive panel having opposite side surfaces, a first gasket attached to the side of the panel and making electrical contact with another opposing panel or subrack, and a first gasket mounting position of the panel A first gasket protection part formed on the front surface side and projecting to the first gasket side, and the first gasket protection part is formed by cutting and raising from the panel to form at least two parts. the cut-and-raised hole formed when cutting and raising parts used as vents, and cut-and-raised holes, intended to be formed so as not to be visible from the panel front That.

  According to the present invention, since it is configured as described above, it is possible to prevent the panel and the subrack gasket from being peeled or damaged when the board is inserted while reducing the number of parts and the cost.

It is a perspective view which shows the structure of the subrack of the communication apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the panel in Embodiment 1 of this invention. It is a top view which shows the state of the gasket before the board | substrate insertion in Embodiment 1 of this invention. It is a top view which shows the dimensional relationship of each part of the panel in Embodiment 1 of this invention. It is a top view which shows the state of the panel in the board | substrate insertion in Embodiment 1 of this invention. It is a top view which shows the state of the panel after the board | substrate insertion in Embodiment 1 of this invention. It is a perspective view which shows the structure of the subrack of the communication apparatus which concerns on Embodiment 2 of this invention. It is a perspective view which shows the structure of the panel in Embodiment 2 of this invention. It is a top view which shows the structure of the panel in Embodiment 3 of this invention. It is a top view which shows the state of the panel in the board | substrate insertion in Embodiment 3 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a perspective view showing a configuration of a subrack 1 of a communication apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view showing a configuration of a panel 3.
In general, in a communication device, as shown in FIG. 1, in order to accommodate a board 2 mounted with electronic components and circuits with high density, a plurality of boards 2 are arranged in parallel and inserted into a slot provided in a rectangular slot 11. 1 is used. A conductive panel 3 is attached to the front surface (subrack opening side when the substrate 2 is inserted into the subrack 1) of the substrate 2 inserted into the subrack 1.

  As shown in FIG. 2, the panel 3 includes a front surface portion 31 perpendicular to the surface of the substrate 2, a gasket mounting portion 32 that is one side surface along the surface of the substrate 2, and a gasket that is the other side surface portion. A substantially U-shaped cross section including the pressing portion 33 is formed. In addition, although the gasket attachment part 32 may be arrange | positioned in the left or right side of the front part 31, the case where it arrange | positions in the left side of the front part 31 is demonstrated below.

In addition, a gasket (first gasket) 4 having a substantially semicircular cross section and having conductivity and elasticity is attached to the gasket attachment portion 32. The gasket 4 constitutes an electromagnetic shield by making electrical contact with the panel 3 (gasket pressing portion 33) of the adjacent substrate or the subrack 1 when the substrate 2 is inserted into the subrack 1. is there.
Due to the mounting structure of the gasket 4, as shown in FIG. 3, an angle θ between the gasket surface 41 and the gasket mounting portion 32 is 90 ° or less, a gasket base portion 42 that exceeds 90 °, and a gasket tip portion 43 that exceeds 90 °. Is present.

  Further, as shown in FIG. 2, the panel 3 has a gasket protection part (second gasket protection part) 5 protruding from the gasket 4 side to the front face 31 side and the gasket 4 side. It is integrally formed. The gasket protection portion 5 is configured to prevent the gasket pressing portion 33 of another substrate 2 from being automatically inserted when another substrate 2 is inserted into an adjacent slot on the gasket 4 side in a state where the substrate 2 is inserted into the subrack 1. It is guided to the gasket tip 43 side so as not to contact the gasket base portion 42 of the substrate 2.

  On the other hand, as shown in FIG. 1, a gasket (second gasket) 6 similar to that of the substrate 2 is also attached to the right inner surface 12 of the subrack opening 11. Further, a gasket protection part (second gasket protection part) 7 projecting toward the gasket 6 is formed integrally with the subrack 1 on the opening side from the attachment position of the gasket 6 of the subrack 1.

Next, the dimensional relationship of each part of the panel 3 configured as described above will be described.
As shown in FIG. 4, the width dimension T2 of the panel 3 (the width dimension from the gasket pressing portion 33 to the tip of the gasket 4) T2 is the width dimension T1 assigned to one substrate 2 in the subrack 1 (see FIG. 6). ) Is configured larger. In addition, the width dimension T3 from the gasket pressing part 33 to the tip of the gasket protection part 5 is smaller than the width dimension T1 assigned to one substrate 2 in the subrack 1, and the distance from the gasket pressing part 33 to the gasket root part 42 is small. It is configured to be larger than the width dimension T4.
The same applies to the dimensional relationship between the gasket 6 attached to the sub-rack 1 and the gasket protection portion 7, and the description thereof is omitted.

Next, an operation when the substrate 2 to which the panel 3 configured as described above is attached is inserted into the subrack 1 will be described.
FIG. 5 is a plan view showing the state of panel 3 during board insertion in Embodiment 1 of the present invention, and FIG. 6 is a plan view showing the state of panel 3 after board insertion. In the following description, a case where a substrate (inserted substrate 2c) is inserted between substrates already inserted in the subrack 1 (adjacent substrates 2a, 2b) will be described. The same applies to the case of inserting.

  In the board insertion operation, as shown in FIG. 5, when the insertion board 2c starts to be inserted into the slot of the subrack 1, the gasket 4 of the insertion board 2c comes into contact with the gasket pressing portion 33 of the adjacent board 2a, and the insertion board 2c The gasket pressing part 33 contacts the gasket 4 of the adjacent substrate 2b. At this time, the gasket pressing portion 33 of the insertion substrate 2c is guided by the gasket protection portion 5 of the adjacent substrate 2b so as to contact only the gasket tip portion 43 of the adjacent substrate 2b. That is, the gasket pressing portion 33 of the insertion substrate 2c does not come into contact with the gasket root portion 42 of the adjacent substrate 2b.

  Therefore, although the board insertion force F1 acts on the gasket 4 of the adjacent board 2b, the board insertion force F1 is not converted into the force F2 that tries to peel off the gasket 4 of the adjacent board 2b from the panel 3. Further, a part of the substrate insertion force F1 is converted into a force F3 that compresses the gasket 4 in a direction perpendicular to the substrate insertion direction. Therefore, the substrate can be inserted without causing the gasket 4 to be peeled off or damaged.

  Thereafter, when the insertion of the insertion board 2c is further advanced and the housing into the sub-rack 1 is completed, the panel 3 of the insertion board 2c is placed in the direction perpendicular to the board insertion direction on both side surfaces 32 and 33 as shown in FIG. The compressed gasket 4 makes electrical contact with the panels 3 of the adjacent substrates 2a and 2b. This constitutes an electromagnetic shield.

As described above, according to the first embodiment, since the gasket protection portion 5 protruding to the gasket 4 side is provided on the front portion 31 side from the mounting position of the gasket 4 of the panel 3, the substrate Since the gasket pressing portion 33 contacts only the gasket tip portion 43 of the adjacent substrate 2a when inserting, the gasket 4 is smoothly compressed, and the substrate can be inserted without causing the gasket to peel or break. Further, since the sub-rack 1 is configured to be provided with the same gasket protection portion 7 as that of the panel 3, it is possible to prevent the sub-rack 1 from being peeled off or damaged.
Further, since the gasket protection portions 5 and 7 are formed integrally with the panel 3 and the subrack 1, the number of parts can be reduced compared to the conventional method as disclosed in Patent Document 1, Subrack assembly cost can be reduced. Further, since a gasket contact operation separate from the substrate insertion operation is not required, the substrate insertion operation cost can be reduced.

Embodiment 2. FIG.
In the first embodiment, the case where the gasket protection portions 5 and 7 are integrally formed with the panel 3 and the sub-rack 1 is shown. However, in the second embodiment, the panel 3 and the sub-rack 1 are made of sheet metal to protect the gasket. A case where the portions 5 and 7 are cut and raised by sheet metal processing will be described.
FIG. 7 is a perspective view showing the configuration of the subrack 1 of the communication apparatus according to Embodiment 2 of the present invention, and FIG. 8 is a perspective view showing the configuration of the panel 3.

As shown in FIGS. 7 and 8, the gasket protection part 5 is formed by being cut and raised from the panel 3 by sheet metal processing. This gasket protection part 5 is partially provided at least in two places at the top and bottom.
Similarly, the gasket protection portion 7 is formed by being cut and raised from the sub-rack 1 by sheet metal processing. This gasket protection part 7 is also partially provided at least in two places at the top and bottom.

  The panel 3 may be provided with a vent hole in the front portion 31 for the purpose of cooling the substrate 2 or the like, but is used as a vent hole formed when the gasket protection portion 5 is cut up. be able to. Thereby, a board | substrate manufacture cost can be reduced rather than the case where a ventilation port is provided independently. Moreover, it is possible to prevent the design of the front portion 31 from being impaired by performing sheet metal processing so that the cut-and-raised hole 8 is not visible from the front of the panel.

  In addition, the dimensional relationship of each part of the panel 3 comprised as mentioned above and the subrack 1 is the same as that shown in FIG. Also, the board insertion operation is the same as the board insertion operation shown in FIGS.

  As described above, according to the second embodiment, since the gasket protection portions 5 and 7 are formed by cutting and raising from the panel 3 and the subrack 1 by sheet metal processing, in addition to the effects of the first embodiment. Thus, the production cost of the substrate / subrack component can be reduced. Further, by using the cut-and-raised hole 8 formed when the gasket protection portion 5 is raised and raised as a ventilation opening, it is possible to reduce the board manufacturing cost when the ventilation opening is provided. Moreover, it is possible to prevent the design of the front portion 31 from being impaired by performing sheet metal processing so that the cut-and-raised hole 8 is not visible from the front of the panel.

Embodiment 3 FIG.
FIG. 9 is a plan view showing a configuration of panel 3 according to Embodiment 3 of the present invention.
The panel 3 according to the third embodiment shown in FIG. 9 is obtained by adding an inclined portion 9 that is inclined inward of the panel 3 to the end of the gasket pressing portion 33 according to the first embodiment shown in FIG. Other configurations are the same, and the same reference numerals are given and description thereof is omitted.

Next, an operation when the substrate 2 to which the panel 3 configured as described above is attached is inserted into the subrack 1 will be described.
FIG. 10 is a plan view showing a state of panel 3 during board insertion in the third embodiment of the present invention. In the following description, a case where a substrate (inserted substrate 2c) is inserted between substrates already inserted in the subrack 1 (adjacent substrates 2a, 2b) will be described. The same applies to the case of inserting.

In the board insertion operation, as shown in FIG. 10, when the insertion board 2c starts to be inserted into the slot of the subrack 1, the gasket 4 of the insertion board 2c comes into contact with the gasket pressing portion 33 of the adjacent board 2a, and the insertion board 2c The gasket pressing part 33 contacts the gasket protection part 5 of the adjacent substrate 2b. At this time, the gasket pressing portion 33 of the insertion substrate 2c is smoothly guided by the inclined portion 9 to the gasket protection portion 5 of the adjacent substrate 2b.
When the insertion substrate 2c is further inserted, the inclined portion 9 starts to contact the gasket tip portion 43 of the adjacent substrate 2b. However, since the contact surface is inclined, the substrate insertion force F1 causes the gasket 4 of the adjacent substrate 2b to move from the panel 3. Without being converted into the force to be peeled off, the force is converted into the force F3 that compresses the gasket 4 in the direction perpendicular to the substrate insertion direction more smoothly than in the first embodiment.

  Thereafter, when the insertion of the insertion board 2c is further advanced and the housing into the subrack 1 is completed, the panel 3 of the insertion board 2c is adjacent to the side surfaces 32 and 33 by the gasket 4 compressed in the direction perpendicular to the board insertion direction. Electrical contact is made with the panel 3 of the substrates 2a, 2b. This constitutes an electromagnetic shield.

  As described above, according to the third embodiment, since the inclined portion 9 that assists the function of the gasket protection portion 5 is provided at the end of the gasket pressing portion 33, the effect of the first embodiment is achieved. In addition, it is possible to insert the substrate more reliably without causing gasket peeling or damage. Further, the inclined portion 9 can be realized as a single part with the panel 3 by sheet metal processing, and can reduce the number of parts compared to the conventional method as disclosed in Patent Document 1, and the parts manufacturing cost / substrate Assembly cost can be reduced. Further, the board insertion work becomes smooth, and the board insertion work cost can be reduced.

  In the present invention, within the scope of the invention, any combination of the embodiments, or any modification of any component in each embodiment, or omission of any component in each embodiment is possible. .

  1 Subrack, 2 Substrate, 2a, 2b Adjacent Substrate, 2c Insertion Substrate, 3 Panel, 4 Gasket (First Gasket), 5 Gasket Protection (First Gasket Protection), 6 Gasket (Second Gasket), 7 Gasket Protective part (second gasket protective part), 8 cut-and-raised hole, 9 inclined part, 11 rectangular frontage, 12 right inner surface, 31 front part, 32 gasket mounting part, 33 gasket pressing part, 41 gasket surface, 42 gasket root part , 43 Gasket tip.

Claims (4)

Subrack into which multiple boards are inserted,
A conductive panel attached to the substrate and having a front portion located on the subrack opening side when the substrate is inserted into the subrack, and both side portions along the substrate surface;
A first gasket attached to the side of the panel and taking electrical contact with another opposing panel or subrack;
A first gasket protection part formed on the front side from the first gasket mounting position of the panel and projecting to the first gasket side ;
The first gasket protection part is formed from at least two parts by being cut and raised from the panel, and is used as a vent through a cut and raised hole formed when the first gasket protection part is cut and raised, and The electromagnetic shield structure is characterized in that the cut-and-raised hole is formed so as not to be seen from the front of the panel . A second gasket attached to the inner surface of the subrack and in electrical contact with the opposing panel;
2. The electromagnetic shield structure according to claim 1, further comprising: a second gasket protection portion formed on the opening side of the subrack from the second gasket attachment position and projecting toward the second gasket side. The electromagnetic shield structure according to claim 2, wherein the second gasket protection part is formed at least two locations by being cut and raised from the subrack. The electromagnetic shield structure according to claim 1, wherein an inclined portion inclined toward the inside of the panel is formed at an end portion of the side surface portion opposite to the first gasket mounting surface of the panel.

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