JP4218084B2 - Electronics - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to electronic devices such as general-use and OA personal computers, server devices, and raid devices, and more particularly, to an electronic device that has a key on a door and has countermeasures against electromagnetic interference (EMI) and electrostatic interference.
[0002]
[Prior art]
Conventionally, in a general disk side type personal computer, a cylinder lock is attached to a door. The cylinder lock is inserted into a hole formed in the door, and is fixed by being tightened with a nut from the inside of the door. Further, a ground wire is sandwiched between the door and the nut, and the cylinder lock and the ground wire are in a conductive state. This ground wire is connected to a metal part of the apparatus main body, discharges static electricity in the cylinder lock, and is provided as a countermeasure against electromagnetic interference.
[0003]
[Problems to be solved by the invention]
However, in the case of the electronic device described above, since the cylinder lock is attached by providing a hole in the door as a molded product, the hole for fixing the cylinder lock may be deformed when strongly tightened with a nut. When the hole is deformed, the direction of the cylinder lock is tilted, and it does not function normally as a lock. Also, the door may crack from the hole.
[0004]
In addition, as described above, the conventional device uses a grounding wire as a countermeasure against static electricity and EMI. However, the grounding wire is exposed, and there is a danger that a person touches the door again when the door is opened or the door is opened or closed. There is a risk of disconnection. Since the door as a molded product is not conductive, noise inside the apparatus body leaks out. For this reason, it is necessary to provide conductivity to the door that performs plating or aluminum deposition on the inside of the door. However, when plating or aluminum deposition is performed, there is a problem that the door cannot be recycled. Disposal of plated or aluminum-deposited molded parts directly leads to environmental pollution.
[0005]
[Means for Solving the Problems]
The present invention in order to solve the above problems, an electronic apparatus mounting the cylinder lock in a non-conducting door, a shield plate detachably mounted on the inside of the non-conducting door, cut and raised is formed in the shield plate portion And a conductive member that electrically connects a shield portion that is formed on the main body and that contacts the cut-and-raised portion when the non-conductive door is closed, and a key attached to the non-conductive door and the shield plate. A second hole smaller than the first hole formed in the non-conductive door, a reinforcing plate disposed inside the non-conductive door, and a positioning portion for positioning the reinforcing plate , The cylinder lock is inserted into the first and second holes, and the cylinder lock is tightened with a screw.
Even if the reinforcing plate is positioned by the door positioning portion and the cylinder lock is strongly tightened by the nut, the position is fixed by the second hole of the reinforcing plate, and the tightening force is not transmitted to the first hole of the door.
[0006]
Since the shield plate is provided inside the door, noise inside the apparatus main body does not leak to the outside, and the door can be recycled. In addition, by providing a conductive member between the door key and the shield plate, it is possible to take countermeasures against static electricity in the key portion.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Elements common to the drawings are denoted by the same reference numerals. 1 and 2 are external views showing an electronic apparatus according to an embodiment of the present invention. FIG. 1 shows a state in which the door is opened, and FIG. 2 shows a state in which the door is closed.
[0008]
1 and 2, the electronic device 1 has a door 2 that opens and closes, and the door 2 rotates around a fulcrum 3. In order to fix the door 2 to the main body 4, first, the tip of the fulcrum 3 is inserted into holes (not shown) formed at the top and bottom of the main body 4, and the fulcrum 3 is attached to the bosses provided above and below the door 2. The door 2 is attached so that it can be opened and closed. A shield plate 5 is attached to the inside of the door 2 with screws 6. The shield plate 5 covers most of the back surface of the door 2. The shield plate 5 has cut and raised portions 7 formed at intervals of about 100 mm.
[0009]
A plurality of ground springs 8 are attached to the front side of the main body 4. FIG. 3 shows the ground spring 8 attached. The ground spring 8 is fixed to the main frame 4a of the main body 4 with screws. The main frame 4a is in contact with the ground of the power source and has a low potential. Each of the ground springs 8 is fixed with a screw at a position facing the cut-and-raised portion 7 of the shield plate 5 when the door 2 is closed, and a part of the ground spring 8 is exposed from the hole 10 formed in the front panel 9 of the main body 4. It has become. That is, when the door 2 is closed, the earth spring 8 contacts the cut and raised portion 7.
[0010]
Of the electromagnetic wave noise generated from the boards and units mounted inside the main body 4, the noise coming out from the front of the apparatus hits the shield plate 5 attached to the door 2 or is reflected or is reflected on the shield plate 5. Try to come off. At that time, the shield plate 5 is in contact with the main frame 4a of the main body 4 through the earth spring 8, and the potential is low. Therefore, the electromagnetic wave noise that was about to be attenuated is attenuated in the shield plate 5 and only slightly appears on the surface.
[0011]
Since the shield plate 5 can be easily detached from the door 2, the door 2 can be recycled when the apparatus 1 is no longer needed. In addition, about the method of attaching the shield board 5 to the door 2, you may make it provide the door 2 and the shield board 5 with the latching claw and the hole corresponding to it instead of fixing with the screw | thread 6. FIG. With this structure, the shield plate 5 can be removed more easily.
[0012]
As shown in FIG. 2, a cylinder lock 11 is attached to the door 2. FIG. 4 is a side view showing the mounting structure of the cylinder lock. In FIG. 4, the cylinder lock 11 has a screw portion 12, and this screw portion 12 is inserted into a hole 13 formed in the door 2. The cylinder lock 11 is fixed by fitting the nut 14 into the threaded portion 12 of the cylinder lock, but the reinforcing plate 15 is sandwiched between the door 2 and the nut 14. A hole 16 is formed in the reinforcing plate 15, and the screw portion 12 is inserted into the hole 16. The position of the reinforcing plate 15 is fixed by a rib 21 formed on the door 2.
[0013]
The reinforcing plate 15 has a side crank shape, and a Schlegel 20 is attached to the tip of the reinforcing plate 15. The Schlegel 20 is provided so as to contact the shield plate 5. A key 17 is inserted into the base portion of the cylinder lock 11, and a cam plate 18 is fixed to the distal end portion with a screw 19. The cam plate 18 rotates in the same direction by rotating the key 17.
[0014]
FIG. 5 is an explanatory view showing a reinforcing plate, and FIG. 6 is an explanatory view showing a hole and a rib of the door. 5 and 6, the vertical length b of the hole 16 of the reinforcing plate 15 is the same as the vertical length B of the hole 13 of the door 2, but the width a of the hole 16 is equal to the width A of the hole 13. It is set smaller (a <A). The rib 21 formed on the door 2 is U-shaped, and its width C is the same as the width c of the reinforcing plate 15 so that the reinforcing plate 15 fits into the rib 21 just. Yes. The length d from the lower end of the reinforcing plate 15 to the center of the hole 16 is the same as the length D from the bottom of the rib 21 to the center of the hole 13. With the above configuration, the reinforcing plate 15 is firmly fixed in position with respect to the door 2.
[0015]
When the cylinder lock 11 is attached to the door 2, the reinforcing plate 15 is sandwiched and tightened with the nut 14, but the reinforcing plate 15 is not moved by the rib 21, and is tightened against the cylinder lock 11 by the force of tightening the nut 14. The force works in the direction of being. At this time, since the hole 16 of the reinforcing plate 15 is smaller than the hole 13 of the door 2, the rotating force applied to the cylinder lock 11 is transmitted to the reinforcing plate 15 and from the reinforcing plate 15 to the rib 21. It is transmitted. Since the rib 21 has sufficient strength and the contact area between the reinforcing plate 15 and the rib 21 is large, the reinforcing plate 15 is not rotated by the rotating force applied to the cylinder lock 11. Therefore, the rotating force applied to the cylinder lock 11 is not applied to the hole 13 of the door 2 and the hole 13 is not deformed.
[0016]
FIG. 7 is an explanatory view showing a lock. 7, two long holes 23 and 24 are formed in the cam plate 18, and one ends of shafts 25 and 26 are movably fitted into the long holes 23 and 24, respectively. The shaft 25 extends upward and is guided by a shaft guide 27 so as to protrude from the upper surface 2 a of the door 2. When the shaft 25 protrudes, it enters a hole (not shown) formed in the upper surface of the main body 4 shown in FIG. 1 and locks the door 2. The shaft 26 extends downward and is guided by a shaft guide 28 so as to protrude downward from the lower surface 2 b of the door 2. When the shaft 26 protrudes, it enters the hole 29 formed in the lower surface of the main body 4 shown in FIG. 1 and locks the door 2. The cam plate 18, the shafts 25 and 26, and the shaft guides 27 and 28 are arranged at positions where they do not contact the reinforcing plate 8.
[0017]
Here, the operation of the lock will be described with reference to FIGS. FIG. 8 is an explanatory diagram for explaining the operation of the lock. When the key 17 is inserted and rotated in the direction of arrow E shown in FIG. 7, the cam plate 18 also rotates in the same direction, the shaft 25 extends upward, is guided by the shaft guide 27, and protrudes from the upper surface 2 a of the door 2. When the shaft 25 protrudes, it enters a hole (not shown) formed in the upper surface of the main body 4 shown in FIG. Further, the shaft 26 extends downward by the rotation of the cam plate 18, is guided by the shaft guide 28, and projects downward from the lower surface 2 b of the door 2. By projecting the shaft 26, the shaft 26 enters the hole 29 formed in the lower surface of the main body 4 shown in FIG. Thereby, the door 2 is locked.
[0018]
Conversely, when the key 17 is turned in the direction of arrow F shown in FIG. 8, the cam plate 18 also rotates in the same direction, and the shaft 25 descends and comes out of the hole in the main body 4. Further, the shaft 26 rises and similarly comes out from the hole 29 of the main body 4. As a result, the door 2 can be opened.
[0019]
When the door 2 is closed, the shield plate 5 and the earth spring 8 are in contact with each other as described above, and the earth spring 8 is in contact with the main frame 4 a of the main body 4. Since the shield plate 5 is in contact with the reinforcing plate 15 via the Schlegel 20, and the reinforcing plate 15 is in contact with the cylinder lock 11, the key 17 is brought into contact with the main frame 4a by closing the door 2. Will be.
[0020]
When the door 2 is closed, the key 17 and the main body 4 come into contact with each other. Therefore, the electrostatic noise applied from the key 17 to the cylinder lock 11 passes through the reinforcing plate 15, the Schlegel 20, the shield plate 5, and the ground spring 8. It is transmitted directly to the frame 4a. Therefore, the applied electrostatic noise is dropped to the ground without affecting the boards and units mounted inside the apparatus. This eliminates the need for a ground wire and eliminates the possibility of the ground wire being disconnected.
[0021]
The electrostatic noise test method is based on JAIDA 52 “Information Device and System Immunity Test”. An outline of the electrostatic test field is shown in FIG. In FIG. 9, a wooden table 31 is placed on a reference ground plane 30, an insulating sheet 32 is laid thereon, and a device under test 33 is placed thereon. A “contact discharge test”, an “in-air discharge test”, and an “indirect discharge test” are performed on the device to be measured 33 placed on the table 31 using the discharge device 34 dedicated to the test.
[0022]
【The invention's effect】
As described above in detail, according to the present invention, in the electronic device in which the cylinder lock is attached to the door, the first hole for inserting the cylinder lock is formed in the door, and the cylinder lock is inserted and is smaller than the first hole. A reinforcing plate formed with a second hole and a positioning portion for positioning the reinforcing plate are formed inside the door, a cylinder lock is inserted into the first and second holes, and the cylinder lock is fixed with a screw. Since the tightening plate is positioned by the positioning portion of the door, the cylinder lock is fixed by the second hole of the reinforcing plate even if the cylinder lock is strongly tightened by the nut, and the tightening force is not applied to the first hole of the door. Not transmitted.
[0023]
The electronic device according to the present invention includes a shield plate attached to the inside of the door, a cut-and-raised portion formed on the shield plate, and a spring portion that is formed on the main body and contacts the cut-and-raised portion when the door is closed. Since it is provided, noise inside the apparatus main body does not leak to the outside, and the door can be recycled. Further, by providing a conductive member for electrically connecting the key attached to the door and the shield plate, it is possible to take countermeasures against static electricity of the key portion.
[Brief description of the drawings]
FIG. 1 is an external view illustrating an electronic apparatus according to an embodiment.
FIG. 2 is an external view illustrating an electronic apparatus according to an embodiment.
FIG. 3 is a perspective view showing an attachment state of an earth spring.
FIG. 4 is a side view showing the mounting structure of the cylinder lock.
FIG. 5 is an explanatory view showing a reinforcing plate.
FIG. 6 is an explanatory view showing a hole and a rib of the door.
FIG. 7 is an explanatory view showing a lock.
FIG. 8 is an explanatory diagram showing the operation of the lock.
FIG. 9 is an explanatory diagram showing an outline of an electrostatic test site.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electronic device 2 Door 4 Main body 5 Shield plate 7 Cut and raised part 8 Ground spring 11 Cylinder lock 13 Hole 15 Reinforcement plate 16 Hole 20 Schlegel 21 Rib

Claims (1)

In electronic devices that attach cylinder locks to non-conductive doors,
A removable shield plate attached to the inside of the non-conductive door;
A cut and raised portion formed on the shield plate;
A spring portion that is formed on the main body and contacts the cut-and-raised portion when the non-conductive door is closed;
A conductive member for electrically connecting a key attached to a non-conductive door and the shield plate, wherein a second hole smaller than the first hole formed in the non-conductive door is formed and non-conductive A reinforcing plate disposed inside the door ;
A positioning portion for positioning the reinforcing plate ;
An electronic apparatus comprising: the cylinder lock being inserted into the first and second holes, and the cylinder lock being tightened with a screw.

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