JP2009054431A - Grounding structure of electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a grounding structure of an electronic device, improving assembly workability and reducing cost. <P>SOLUTION: A window 10 for a grounding spring is provided on a rear end of a case 8, a printed board 9 having a grounding spring 12 mounted by a mounting spring 13 is inserted from a front end of the case 8 to form a module 16. The grounding spring 12 is projected from the window 10 for a grounding spring. A base 15 is mounted on the rear end of the case 8, and a grounding part 15b of the base 15 is made in contact with the grounding spring 12 projected from the window 10 for a grounding spring. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a grounding structure between a module and a base in an electronic device such as a programmable controller.

  FIG. 6 shows a grounding structure of a conventional electronic device, and the metal block 2 becomes a grounding portion of the printed board 1 by attaching the metal block 2 to the printed board 1 provided with a grounding portion on the surface with screws 3. Further, the printed board 1 is inserted into the case 5 to which the metal plate 4 is attached, and the metal block 2 is stopped by the screw 6 inserted into the case 5 through the metal plate 4 so that the metal plate 4 is connected to the grounding portion of the printed board 1. Become. Further, when the module including the case 5 and the printed board 1 is attached to the base 7, the base 7 is securely grounded to the metal plate 4 by being attached with the screws 6.

Prior art document information relating to the invention of this application includes the following.
JP-A-8-181462

  However, the grounding structure of the conventional electronic device shown in FIG. 6 has to be screwed at two places, the screw 3 and the screw 6, and the workability is poor and the cost is high. In addition, the metal block 2 and the metal plate 4 are required, which also increases the cost.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a grounding structure for an electronic device that can be assembled easily and can be inexpensively manufactured.

  According to a first aspect of the present invention, there is provided a grounding structure for an electronic device, a case provided with a grounding spring window at one end thereof, a grounding spring attached by a screw, and inserted into the case to form a module. Is provided with a printed circuit board protruding from the ground spring window, and a base attached to the ground spring window side of the case and in contact with the ground spring protruding from the ground spring window.

  The ground structure of the electronic device according to claim 2 is such that the ground spring is formed in a U shape having a shoulder portion, and one end thereof is slidably engaged with a guide hole provided in the printed board.

  According to a third aspect of the present invention, there is provided a grounding structure for an electronic device, wherein a shoulder support for placing a shoulder portion of the grounding spring is provided on a grounding spring window of the case, a tapered portion is provided on the inner side of the shoulder support, and a tapered portion is provided. A taper portion is provided on the outside when the ground spring is pulled out.

  According to a fourth aspect of the present invention, there is provided a grounding structure for an electronic device in which a grounding spring barrier that protects the projecting grounding spring from external force is provided around the grounding spring window of the case.

  As described above, according to the first aspect of the present invention, the grounding spring is attached to the printed board with screws, the printed board is inserted into the case, and the grounding spring protruding from the grounding spring window of the case is brought into contact with the base. By doing so, the module is grounded to the base via a grounding spring. Therefore, it is not necessary to attach the ground spring to the case with screws, so that the assembly workability can be improved and the cost can be reduced.

  According to the second aspect of the present invention, the ground spring is formed in a U shape having a shoulder portion, and one end of the ground spring is slidably engaged with a guide hole provided in the printed board. Therefore, it is possible to easily cope with dimensional errors.

  According to the third aspect, the shoulder support for placing the shoulder portion of the ground spring is provided on the ground spring window of the case, the tapered portion is provided on the inside of the shoulder support when the ground spring is inserted, and the ground spring is provided on the outside of the shoulder support. A taper part is provided at the time of extraction, and it is possible to easily check whether the assembly is done normally by placing the shoulder part of the grounding spring on the shoulder rest of the case, and inserting the grounding spring into the shoulder rest Since the time taper portion and the time taper portion are provided, it is easy to attach and remove the printed board to which the ground spring is attached.

  According to the fourth aspect, the ground spring barrier is provided around the ground spring window of the case, and the ground spring protruding from the ground spring window can be protected from external force.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 2 is a perspective view of the case 8 and the printed board 9, and FIGS. 3A and 3B are a case where a printed board with a ground spring attached is mounted, that is, a rear view and a vertical side view of the lower part of the module. A ground spring window 10 is provided at the rear end of 8, and a ground spring barrier 11 is provided on both the left and right sides of the ground spring window 10. Reference numeral 12 denotes a ground spring attached to the ground spring support 9a of the printed board 9 with a mounting screw 13. The ground spring 12 is formed in a U shape having both end portions 12a and 12b as shown in FIG. A shoulder 12c is formed at the rear end, a protrusion 12d is formed at one end 12a, and a mounting hole 12e for the mounting screw 13 is formed near the other end 12b. A shoulder receiver 14 for receiving a shoulder portion 12 c is provided at the lower edge of the ground spring window 10 of the case 8. Reference numerals 14a and 14b denote a taper portion at the time of insertion and a taper portion at the time of extraction provided on the inner side and the outer side of the shoulder rest 14 of the case 8, and 9b is provided on the printed board 9 so that the protruding portion 12d of the ground spring 12 can slide. It is a guide hole of the grounding spring 12 engaged.

  The grounding spring 12 is provided in a portion in contact with the pattern of the grounding portion of the printed board 9, and the grounding spring 12 is fixed to the grounding spring support portion 9a by a mounting screw 13 inserted into the mounting hole 12e. Part. The ground spring 12 does not need to be screwed to the case 8. When the printed board 9 to which the ground spring 12 is attached is inserted into the case 8, the shoulder 12 c of the ground spring 12 is moved over the shoulder rest 14. The printed board 9 is fitted and fixed to the case 8 simply by being inserted into the case 8. In order to make it easier to get over the shoulder 12c of the ground spring 12 over the shoulder receiver 14 of the case 8, a tapered portion 14a is provided inside the shoulder receiver 14 during insertion. Similarly, a taper portion 14b at the time of extraction is provided outside the shoulder support 14 in order to facilitate extraction when the shoulder portion 12c of the ground spring 12 is extracted. By doing so, the ground spring 12 can be inserted and removed. The ground spring barrier 11 is provided so that an external force is applied to the ground spring 12 from the outer surface of the case 8 and the ground spring 12 is not shrunk and plastically deformed. When the printed board 9 is inserted from the front end of the case 8, the ground spring 12 protrudes from the ground spring window 10 of the case 8.

  Next, grounding between the module 16 formed by inserting the printed board 9 into the case 8 and the base 15 will be described with reference to FIGS. FIG. 1 is a side view of an electronic apparatus having a grounding structure according to the best mode, and FIG. 15a is a hook provided on the base 15, and 17 is a hook provided on the rear end of the case 8. The hooks 15a and 17 are hooked, and the module 16 is rotated around the hook 15a. The module 16 is fixed to the base 15 with the fixing screw 18. At that time, the ground spring 12 contacts the ground portion 15 b of the base 15, and the modulo 16 is grounded to the base 15 through the ground spring 12. When the grounding spring 12 comes into contact with the grounding part 15b of the base 15, the projecting part 12d of the grounding spring 12 slides rearward along the guide hole 9b of the printed board 9, and both end parts 12a and 12b rotate upward. Meanwhile, the rear end of the ground spring 12 continues to contact the ground portion 15b of the base 15.

  In the embodiment, the ground spring 12 is attached to the printed board 9 with the mounting screw 13, the printed board 9 inserted into the case 8 is fitted and fixed in the case 8, and the ground spring window 10 of the case 8 is fixed. The protruding grounding spring 12 is in contact with the grounding part 15 b of the base 15, and the module 16 including the printed board 9 and the case 8 is grounded to the base 15 through the grounding spring 12. For this reason, it is not necessary to attach the ground spring 12 to the case 8 with a screw, so that the assembly workability can be improved and the cost can be reduced. The ground spring 12 is formed in a U shape having a shoulder portion 12c, and the projecting portion 12d at one end 12a is slidably engaged with a guide hole 9b provided in the printed board 9, so that the ground spring 12 The deformation is easy, the contact pressure of the ground spring 12 with the bail 15 can be adjusted, and it is possible to easily cope with dimensional errors and the like.

  Further, a shoulder support 14 for placing the shoulder 12c of the ground spring 12 is provided on the ground spring window 10 of the case 8, and a taper portion 14a when the installation spring 12 is inserted and a taper portion 14b when the installation spring 12 is pulled out are provided inside and outside the shoulder support 14. Easily confirms whether or not the assembly is normally performed by placing the shoulder 12c of the ground spring 12 on the shoulder receiver 14 of the case 8, that is, whether or not the ground spring 12 is caught on the way. In addition, by providing the taper portion 14a at the time of insertion and the taper portion 14b at the time of extraction, it is possible to easily attach and detach the printed board 9 to which the ground spring 12 is attached. Further, the installation spring barriers 11 are provided on both the left and right sides of the ground spring window 10 of the case 8, and the ground spring 12 can be prevented from being plastically deformed by an unexpected external force.

1 is a side view of an electronic apparatus having a ground structure according to the best mode for carrying out the invention. 1 is a perspective view of a case and a printed board according to the best embodiment of the present invention. It is the rear view and vertical side view of the lower part of the case which mounted the printed circuit board by this Embodiment best mode. 1 is a perspective view of a ground spring according to a best mode of the present invention. FIG. It is a vertical side view of the lower part of the state which attached the case by this Embodiment to the base. It is a disassembled perspective view of the grounding structure of the conventional electronic device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 8 ... Case 9 ... Printed board 9a ... Ground spring support part 9b ... Guide hole 10 ... Ground spring window 11 ... Ground spring barrier 12 ... Ground spring 12c ... Shoulder part 13 ... Mounting screw 14 ... Shoulder support 14a ... Taper at the time of insertion Part 14b ... Tapered part at the time of withdrawal 15 ... Base 15a, 17 ... Hook 15b ... Grounding part 16 ... Module 18 ... Fixing screw

Claims (4)

  A case provided with a ground spring window at one end, a ground spring attached with a screw, and inserted into the case to form a module, the ground spring projecting from the ground spring window, and the grounding of the case A grounding structure for an electronic device, comprising: a base attached to a spring window side; and a base in contact with a grounding spring protruding from the grounding spring window.   2. The grounding structure for an electronic device according to claim 1, wherein the grounding spring is formed in a U-shape having a shoulder portion, and one end thereof is slidably engaged with a guide hole provided in the printed board.   A shoulder support for placing the shoulder of the grounding spring on the grounding spring window of the case is provided. A taper is provided inside the shoulder support when the grounding spring is inserted, and a taper is provided outside the shoulder support when the grounding spring is pulled out. The grounding structure for an electronic device according to claim 1 or 2,   The grounding structure for an electronic device according to any one of claims 1 to 3, wherein a grounding spring barrier that protects the projecting grounding spring from external force is provided around the grounding spring window of the case.

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