JPH04245699A - Electromagnetic wave shield device for rotary shaft - Google Patents

Abstract

PURPOSE:To enhance rotation performance and electromagnetic shield performance by passing a signal cable and a power source cable into a cylindrical rotary shaft of a display and installing a contact plate which forms electrical contact with the cylinder-shaped shaft. CONSTITUTION:A bushing 1 is inserted into a hole board on the head of a case 5 which houses a display 18 and a hole 9 bored in a case 8 on the side of an equipment main body so that the bushing 1 may be mounted with a socket 6 installed to the case 5 with screws 17. A signal cable 15 and a power source cable 16 are passed through the bushing 1, thereby connecting the display 18 with the equipment main body. A contact plate 11 is inserted into a hook claw 10 installed to the case 8 of the equipment main body from the circumferential direction. This construction makes it possible to place the bushing 1 into electrical contact with the contact plate 11 and the case 8 and maintain a satisfactory contact state even when the case 5 and the bushing 1 are rotated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for connecting signal cables and power cables between a display and a main body when the display rotates in a general-purpose computer, and for shielding these electromagnetic waves.

0002

2. Description of the Related Art Conventionally, when opening and closing the display, the rotating shaft was divided and connected to the display and the main body to connect the signal cable and the power cable, and the rotating shaft was nickel-plated to shield electromagnetic waves.

0003

However, this conventional technique has the following drawbacks.

First, in order to divide the rotating shaft, electromagnetic waves leak from the gap between the divisions. Further, abnormal noise is generated due to rotational contact with the mating parts of the divisions. Then, due to the rotational contact between the contact portion with the plated surface and the circumferential direction, the plating peels off, resulting in poor contact and damage.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide an electromagnetic shielding device for a rotating shaft that has excellent rotational performance and electromagnetic shielding performance.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a cylindrical bush 1 on the rotating shaft of the display, and passes a signal cable 15 and a power cable 16 inside the bush 1 to connect it to the bush 1 for electrical conductivity. Contact plate 11 that makes contact
This is an electromagnetic shielding device for rotating shafts consisting of:

[0007]

[Operation] With the above structure, the case 5 and the bush 1 are fixed and make a conductive contact, and the bush 1 makes a conductive contact with the contact plate 11 and the case 8, and even if the case 5 and the bush 1 rotate, they are in contact. The state can be maintained.

[0008]

[Embodiment] An embodiment of the present invention will be described with reference to FIG.

The bush 1 is inserted into the hole 7 provided in the neck 19 of the case 5 containing the display 18 and the hole 9 provided in the case 8 on the device body side, and the bush 1 is inserted into the boss 6 provided in the case 5. Attach with screw 17.

A signal cable 15 and a power cable 16 are passed inside the bush 1 to connect the display 18 and the main body of the device. The contact plate 11 is inserted in the circumferential direction into the hook part 10 provided on the case 8 on the side of the main body of the device.

[0011]

Effects of the Invention In the electromagnetic wave shielding device for a rotating shaft of the present invention, since the signal cable and the power cable are passed through the inside of the bush, the signal cable and the power cable are not visible from the outside even when the case is rotated.

Further, the cylindrical surface of the bushing and the dowel at the tip of the radial contact piece of the contact plate are in point contact with the cylindrical surface of the bushing, and since the contact piece is a cantilevered leaf spring, the elasticity of the spring causes the cylindrical surface to There is no contact failure due to uneven rotation, and the contact has good electrical conductivity and spring elasticity, which absorbs contact resistance and reduces abnormal noise.

[Brief explanation of the drawing]

[Fig. 1] An exploded perspective view of an electromagnetic shielding device for a rotating shaft according to the present invention.

[Explanation of symbols]

1 Cylindrical bush 5 Case 6 Boss 7 Hole 8　Device main body side case 9 holes 10 Hook part 11 Contact plate 15 Signal cable 16 Power cable 17 Screw

Claims (1)

[Claims] 1. An electromagnetic wave shielding device for a rotating shaft, in which the rotating shaft of a display is cylindrical, a signal cable and a power cable are passed through the rotating shaft, and a contact plate is provided to make electrical contact with the cylindrical shaft.