JP4659625B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic apparatus provided with a metal plate arranged for the countermeasure against EMI (electromagnetic wave interference) around an electronic component such as a communication connector.

  An electronic device mounted on an image forming apparatus such as an electrophotographic copying machine includes a metal casing, and a system board is accommodated therein. Various electronic components such as a communication connector such as a LAN, an enabler, and a USB are mounted on the system board.

  By the way, in an electronic device, as an EMI countermeasure, a metal plate is disposed around an electronic component such as a communication connector. This metal plate is screwed to the housing to prevent noise leakage. However, noise from the system board cannot be accurately estimated unless the product is actually completed. Therefore, it is difficult to determine the arrangement and shape of the metal plate at the design stage of the electronic device. Therefore, at present, after the product is completed, the arrangement and shape of the metal plate are determined so that the leaked noise satisfies the EMI standard.

In recent years, as an EMI countermeasure, an EMI countermeasure apparatus in which a connector frame is arranged around a connector has been disclosed (see, for example, Patent Document 1). In the above-mentioned EMI countermeasure device, the connector frame is screwed to the chassis or the housing through the leaf spring and the grounding hardware.
JP-A-11-16639

  By the way, the arrangement and shape of the metal plate are determined after the product is completed as described above. Therefore, depending on the shape of the metal plate, the metal plate may be screwed at two or more locations. If it becomes like this, the positioning operation | work and fixing operation | work of a metal plate will become difficult, and it may also consider that the assembly efficiency of an electronic device falls as a result. Moreover, if the connector frame, the leaf spring, and the grounding hardware are separate bodies as in the conventional EMI apparatus, the assembly efficiency is further reduced.

  The present invention provides an electronic device in which a conducting member can be easily attached without adding a new member.

  In order to solve the above problems and achieve the object, an electronic apparatus according to the present invention is configured as follows.

(1) In an electronic device to which another member is fixed, a metal housing, an electronic component that is housed in the metal housing and includes a metal portion, and is connected to the metal housing, and the separate member is screwed. A first attachment sheet metal, a second attachment sheet metal connected to the metal casing and disposed on the side of the electronic component and screwed to the other member, and supported by the first attachment sheet metal A grounding metal having a first portion that is formed and a second portion that is disposed between the electronic component and the second mounting sheet metal and has a hole at a position corresponding to the second mounting sheet metal A metal spring portion connected to the grounding metal plate portion, contacting a metal portion of the electronic component, and urging the grounding metal plate portion to contact the second mounting sheet metal; Formed on the second mounting sheet metal, It is provided with a protrusion for positioning the second portion of the ground plate portion projects into the part.

(2) In the electronic device described in (1), the protruding portion is a burring portion formed to screw the separate member onto the second mounting sheet metal.

(3) In the electronic device described in (1), the electronic device further includes an engaging portion that is formed on the first attachment metal plate and positions the first portion of the metal plate for grounding.

(4) In the electronic device described in (3), the engagement portion is a protrusion formed to position the separate member.

(5) In the electronic device described in (1), the first portion of the grounding metal plate is sandwiched between the separate member and the first mounting sheet metal.

(6) In the electronic device described in (1), the grounding metal plate portion and the metal spring portion are integral parts.

(7) In the electronic device described in (1), the electronic component is a connector for communication.

  According to the present invention, the positioning of the conductive member is simplified in the assembly work of the electronic device. In addition, it is not necessary to add a new member.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of an electronic device 1 on which a hard disk drive H according to an embodiment of the present invention is mounted, and FIG. 2 is a perspective view of a bracket B to which the hard disk drive H is attached in the same embodiment.

  As shown in FIGS. 1 and 2, an electronic apparatus 1 according to this embodiment is mounted on an electrophotographic copying machine, and a hard disk drive H is mounted on a metal casing 10 by a bracket (separate member) B. Fixed. The bracket B has a frame structure composed of a plurality of steel materials b, and each steel material b is fixed to the electronic device 1 with screws N. In this embodiment, the hard disk drive H is mounted on the bracket B, but the present invention is not limited to this.

  FIG. 3 is a perspective view of the electronic apparatus 1 in the embodiment. As shown in FIG. 3, the electronic device 1 includes a metal housing 10, a system board 20, three communication connectors (electronic components) 30, and a conduction member 40. As the communication connector 30, for example, a LAN connector, an enabler connector, a USB connector, or the like is assumed. However, the electronic component in the present invention is not limited to the communication connector 30 and includes a metal portion and the like in which charging becomes a problem.

  The metal housing 10 includes a rectangular bottom wall 11 and first to fourth side walls 12 to 15 connected to respective edges of the bottom wall 11. As a material of the metal casing 10, a steel material having conductivity is used. The first to fourth side walls 12 to 15 are arranged almost at right angles to the bottom wall 11, and a lid (not shown) or the like is fixed to the end opposite to the bottom wall 11. A lid metal plate 16 is formed.

  The first side wall 12 and the second side wall 13 are separated from the lid sheet metal 16 described above, respectively, by a first hard disk sheet metal (first attachment sheet metal) 17 and a second hard disk sheet metal (second attachment sheet metal). 18. The first hard disk metal plate 17 and the second hard disk metal plate 18 are portions to which the steel material b of the bracket B is screwed, and the interval corresponds to the interval between the adjacent steel materials b.

  FIG. 4 is a perspective view of the periphery of the first side wall 12 to which the conducting member 40 is not attached in the same embodiment, and shows the enclosure A in FIG. 3 in an enlarged manner. As shown in FIG. 4, the first hard disk metal plate 17 extends almost in parallel with the bottom wall 11 toward the inside of the metal housing 10, and a burring portion 171 is formed at the center position thereof. The burring portion 171 protrudes from the first hard disk metal plate 17 toward the bottom wall 11, and a female screw portion (not shown) into which a screw N is screwed is formed on the inner surface thereof.

  The first hard disk metal plate 17 includes a hook portion (projection portion) 172 in the vicinity of the burring portion 171. Note that the hook portion 172 includes only the first hard disk metal plate 17 formed on the first side wall 12, and does not include the first hard disk metal plate 17 formed on the second side wall 13.

  The hook portion 172 protrudes from the first hard disk sheet metal 17 toward the outside of the metal housing 10, and an engagement protrusion 173 is formed at the tip thereof. The engagement protrusion 173 protrudes toward the fourth wall portion 15, and a recess 174 larger than the thickness of the main plate 41 of the conductive member 40 is provided between the first hard disk sheet metal 17 and the engagement protrusion 173. Is formed.

  The second hard disk metal plate 18 extends almost in parallel with the bottom wall 11 toward the inside of the metal housing 10, and a burring portion 181 is formed at the center position thereof. The burring portion 181 protrudes from the second hard disk metal plate 18 toward the bottom wall 11, and a female screw portion (not shown) into which a screw N is screwed is formed on the inner surface thereof.

  The first side wall 12 includes three connector openings 121 in the vicinity of the second hard disk sheet metal 18. These connector openings 121 are formed on the opposite side of the bottom wall 11 with respect to the system board 20, and are almost lined up along the plate surface of the system board 20.

  The system board 20 is disposed in the metal housing 10 almost in parallel with the bottom wall 11. The communication connector 30 is mounted in the vicinity of the second hard disk metal plate 18 on the plate surface of the system board 20, and is connected to the outside of the metal housing 10 through three connector openings 121 formed in the first side wall 12. Is exposed. In the present embodiment, three communication connectors 30 exist, but at least one communication connector 30 may be provided.

  The communication connector 30 includes a metal case (metal part) 31 for ground connection. The metal case 31 is in point contact with the edge of the connector opening 21 at a plurality of locations, and is electrically connected to a ground member (not shown) mounted on the electrophotographic copying machine through the metal housing 10. As a material of the metal case 31, a steel material having conductivity is used.

  Although the size of the metal case 31 varies depending on the type, the size of the metal case 31 is smaller than the distance between the system board 20 and the second hard disk metal plate 18. Thereby, a gap S is formed between the second hard disk metal plate 18 and the communication connector 30.

  FIG. 5 is a perspective view of the conducting member 40 in the same embodiment. As shown in FIG. 5, the conduction member 40 includes a main plate 41 and three spring plates 42. The main plate (ground metal plate portion) 41 and the spring plate (metal spring portion) 42 are folded back at the connecting portion, and are almost V-shaped when viewed from the side. As the material of the conducting member 40, a stainless steel material having conductivity is used.

  The main plate 41 is formed in a band shape, and includes a first portion 411 and a second portion 412 at both sides in the longitudinal direction. The first portion 411 is a portion that engages with the first hard disk sheet metal 17 and includes a round hole 411 a at a position corresponding to the burring portion 171 and a long hole 411 b at a position corresponding to the hook portion 172. Yes. The second portion 412 is a portion that engages with the second hard disk metal plate 18 and includes a round hole (hole portion) 412 a at a position corresponding to the burring portion 181. The spring plate 42 is formed at the same interval as the three communication connectors 30 mounted on the system board 20, and has a contact portion 421 extending almost in parallel with the main plate 41 at the tip thereof.

  FIG. 6 is a perspective view of the periphery of the first side wall 12 to which the conducting member 40 is attached in the same embodiment, and shows the enclosure A in FIG. 3 in an enlarged manner. As shown in FIG. 6, the main plate 41 is arranged from the first hard disk sheet 17 to the second hard disk sheet 18.

  The first portion 411 is superposed on the outer surface of the first hard disk metal plate 17 and is sandwiched between the first hard disk metal plate 17 and the steel material b of the bracket B to be fixed later. At this time, the hook portion 172 formed on the first hard disk metal plate 17 is engaged with the steel material b of the bracket B through the long hole 411 b formed in the first portion 411. At the same time, the round hole 411 a formed in the first portion 411 of the main plate 41 coincides with the position of the female screw portion (not shown) formed in the first hard disk sheet metal 17.

  The second portion 412 is superposed on the inner surface of the second hard disk sheet metal 18. At this time, the burring portion 181 formed in the second hard disk sheet metal 18 enters the round hole 412a formed in the second portion 412 of the main plate 41 as shown in FIG.

  The spring plate 42 is accommodated in the gap S between the second hard disk metal plate 18 and the communication connector 30, is in close contact with the metal case 31 of the communication connector 30, and biases the main plate 41 to form the second hard disk metal plate 18. Press against the inner surface.

(Attaching the conductive member 40)
When the system board 20 on which electronic components such as the communication connector 30 are mounted is mounted on the metal casing 10, a noise test is performed. In the noise test, if the noise exceeds the EMI standard, the conductive member 40 is attached to a site where the noise should be reduced. The shape, size, and position of the conductive member 40 are appropriately determined based on the result of the noise test.

  In attaching the conductive member 40, first, the first portion 411 of the main plate 41 is superposed on the outer surface of the first hard disk metal plate 17. As a result, the hook portion 172 formed in the first hard disk metal plate 17 is inserted into the long hole 411b formed in the first portion 411 of the main plate 41, and the main plate is engaged by the engagement between the hook portion 172 and the long hole 411b. 41 first portions 411 are positioned.

  Next, in a state where the spring plate 42 is compressed, the second portion 412 of the main plate 41 is inserted into the gap S between the second hard disk metal plate 18 and the communication connector 30 together with the spring plate 42. Then, the second portion 412 of the main plate 41 is superposed on the inner surface of the second hard disk metal plate 18 by urging from the spring plate 42. As a result, the burring portion 181 formed in the second hard disk sheet metal 18 is inserted into the round hole 412a formed in the main plate 41, and the second portion of the main plate 41 is engaged by the engagement between the burring portion 181 and the round hole 412a. 412 is positioned.

  FIG. 7 is a cross-sectional view taken along the FF plane shown in FIG. As shown in FIG. 7, the second portion 412 of the main plate 41 is pressed against the inner surface of the second hard disk metal plate 18 by urging from the spring plate 42. Therefore, once the burring portion 181 enters the round hole 412a, these engagement states are not released.

  When the first portion 411 and the second portion 412 of the main plate 41 are positioned, the bracket B of the metal housing 10 is mounted, and the steel material b of the bracket B is screwed onto the first side wall 12 and the second side wall 13 with a screw N. Fixed by. As a result, the first portion 411 of the main plate 41 superimposed on the outer surface of the first hard disk metal plate 17 is sandwiched between the steel material b of the bracket B and the first hard disk metal plate 17, and is firmly attached to the metal housing 10. Fixed. At this time, the conduction member 40 is so-called detented by engagement between the burring portion 181 formed on the second hard disk metal plate 18 and the round hole 412a formed on the second portion 412 of the main plate 41. In the fixing operation between the metal housing 10 and the bracket B, the displacement of the conducting member 40 does not occur.

  The second portion 412 of the main plate 41 is only superposed on the inner surface of the second hard disk metal plate 18 and is not sandwiched between the bracket B and the second hard disk metal plate 18. Since the 1st part 411 is being firmly fixed to the metal housing | casing 10, problems, such as dropping of the conduction | electrical_connection member 40, do not arise.

(Operation by this embodiment)
In the electronic apparatus 1 according to the present embodiment, the burring portion 181 formed on the second hard disk sheet metal 18 enters a round hole 412 a formed in the second portion 412 of the main plate 41. Moreover, the second portion 412 of the main plate 41 is pressed against the inner surface of the second hard disk metal plate 18 by the urging force from the spring plate 42, so that the burring portion 181 is difficult to escape from the round hole 412a. Therefore, since the second portion 412 of the main plate 41 does not move unintentionally due to the engagement between the burring portion 181 and the round hole 412a, the conducting member for fixing the metal casing 10 and the bracket B is prevented. The positioning of 40 is very simple.

  Moreover, the burring portion 181 is an existing portion formed to screw the metal casing 10 and the bracket B together. Therefore, it is not necessary to add a new part to the metal housing 10 for positioning the first part 411 of the main plate 41.

  In the conductive member 40 in the present embodiment, the first portion 411 of the main plate 41 is sandwiched between the first hard disk metal plate 17 and the bracket B. Therefore, there is no fear of the conduction member 40 dropping off. In addition, since the main plate 41 and the first hard disk metal plate 17 are firmly attached, sufficient conduction between the communication connector 30 and the metal housing 10 can be obtained.

  In the conductive member 40 in the present embodiment, the first portion 411 of the main plate 41 is positioned by a hook portion 172 formed on the first hard disk sheet metal 17. Therefore, attachment of the conduction member 40 is simplified.

  In addition, the hook portion 172 is an existing portion formed to position the bracket B with respect to the metal housing 10. Therefore, it is not necessary to add a new part to the metal housing 10 for positioning the first part 411 of the main plate 41.

  Further, the hook portion 172 includes an engagement protrusion 173. Therefore, once the hook part 172 is inserted into the long hole 411b, the presence of the engagement protrusion 173 prevents the conduction member 40 from dropping off.

  In the conducting member 40 of the present embodiment, the main plate 41 and the spring plate 42 are integral parts formed from a single plate material. Therefore, the manufacture of the conduction member 40 is simple.

  In the present embodiment, the first portion 411 of the main plate 41 is sandwiched between the metal casing 10 and the bracket B, but the present invention is not limited to this. For example, the first portion 411 of the main plate 41 may be superposed on the inner surface of the first hard disk metal plate 17. In this case, the burring portion 171 formed in the first hard disk sheet metal 17 enters the round hole 411 a formed in the first portion 411 of the main plate 41 to position the first portion 411 of the main plate 41. Become. If the urging force from the spring plate 42 does not reach the second portion 412 of the main plate 41, a new spring plate may be added.

  In the present embodiment, the electronic apparatus 1 mounted on the image forming apparatus is described. However, the present invention is not limited to this, and any type of EMI countermeasure is required. It may be an electronic device. Further, in the present embodiment, the main plate 41 and the spring plate 42 are integral parts, but may be separate parts.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

1 is a perspective view of an electronic device equipped with a hard disk drive according to an embodiment of the present invention. The perspective view of the bracket with which the hard-disk drive in the same embodiment was attached. The perspective view of the electronic device in the embodiment. The perspective view of the periphery of the 1st side wall in which the conduction | electrical_connection member in the same embodiment is not attached. The perspective view of the conduction member in the embodiment. The perspective view of the periphery of the 1st side wall to which the conduction | electrical_connection member in the same embodiment was attached. Sectional drawing which cut | disconnects and shows the principal part structure in the same embodiment in the FF surface shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electronic device, 10 ... Metal housing, 17 ... 1st hard disk sheet metal (1st attachment sheet metal), 18 ... 2nd hard disk sheet metal (2nd attachment sheet metal), 31 ... Metal case (metal part), DESCRIPTION OF SYMBOLS 30 ... Communication connector (electronic component), 41 ... Main plate (ground metal plate part), 42 ... Spring plate (metal spring part), 411 ... 1st part, 412 ... 2nd part, 412a ... Round hole ( Hole part), 172... Hook part (projection part), 181... Burring part (protrusion part). B: Bracket (separate member).

Claims (7)

In an electronic device to which another member is fixed,
A metal housing;
An electronic component housed in the metal housing and provided with a metal portion;
A first mounting sheet metal connected to the metal housing and screwed to the other member;
A second attachment metal plate connected to the metal housing and disposed on the side of the electronic component, and the separate member is screwed;
A second portion provided between the first portion supported by the first mounting sheet metal, the electronic component and the second mounting sheet metal, and having a hole at a position corresponding to the second mounting sheet metal. A metal plate portion for grounding having a portion of
A metal spring portion coupled to the ground metal plate portion and contacting a metal portion of the electronic component, and urging the ground metal plate portion to contact the second mounting sheet metal;
An electronic apparatus comprising: a protrusion formed on the second mounting sheet metal and protruding into the hole to position the second portion of the ground metal plate.   The electronic device according to claim 1, wherein the protruding portion is a burring portion formed to screw the another member onto the second mounting sheet metal.   The electronic device according to claim 1, further comprising an engaging portion that is formed on the first mounting sheet metal and positions the first portion of the ground metal plate portion.   The electronic apparatus according to claim 3, wherein the engaging portion is a protrusion formed to position the separate member.   2. The electronic device according to claim 1, wherein the first portion of the grounding metal plate is sandwiched between the separate member and the first mounting sheet metal.   The electronic device according to claim 1, wherein the grounding metal plate portion and the metal spring portion are integral parts.   The electronic device according to claim 1, wherein the electronic component is a communication connector.

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