JP2983843B2 - Ground connection structure for electronic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground connection structure for an electronic device such as a VTR.

[0002]

2. Description of the Related Art Conventionally, as a method of earthing a cover top and a cover bottom in an electronic device, that is, a so-called loop earthing method, one of a cover top and a cover bottom is connected to an earth, and both are connected to a chassis by screws. Tightening has been done. As a ground connection means in that case, a conductive metal fitting connected to the ground portion of the power supply circuit,
Alternatively, a lead wire or the like is used as a relay member.

[0003]

SUMMARY OF THE INVENTION Parts as a relay member for loop-earthing outer conductors such as a cover bottom and a cover top and the number of assembling operations thereof are reduced, and the storage space (volume) of the cover bottom and its transportation. Reduce costs, etc.

[0004]

Therefore, according to the present invention, there is provided a shield case which is connected to a ground portion and shields a power supply portion, a chassis having mounting bosses on left, right and side surfaces and a rear surface, and a shield case mounted on a rear portion; A rear panel attached to the rear of the vehicle, a first tongue on the front left and right side edges and a second tongue on the rear edge to face the rear panel, a cover bottom for covering the bottom surface of the chassis, and a top surface of the chassis. The shield case is provided with a projecting piece that penetrates the rear panel and looks out to the outside.When the rear panel, cover bottom and cover top are fitted and screwed to the chassis in order, the projecting piece becomes Abuts on the tongue piece 2 and is connected to ground. Further, the first tongue is bent at approximately 45 ° to enable stacking of the cover bottoms.

[0005]

With the above arrangement, the cover bottoms are stacked and stored in a small space, and have a small volume at the time of transportation, so that the transportation cost is reduced. Also, when the rear panel, cover bottom and cover top are assembled to the chassis, the projecting piece of the shield case contacts the tongue of the cover bottom and is grounded, and the cover top is also grounded via the tongue. The loop ground of the electronic device is established.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment will be described below with reference to the drawings. 1 is an exploded perspective view, FIG. 2 is an explanatory view of stacking the cover bottom, and FIG. 3 is an exploded perspective view of a ground connection portion.

In FIG. 1, reference numeral 1 denotes a chassis in which protruding walls 2 and 2 are integrally formed by resin molding at the rear. A mechanism base 3 is mounted on the chassis 1, and a front panel 4 is further provided on the front. Has been attached. A shield case 5 that electromagnetically shields a power supply unit (not shown) is attached to the rear surface. The shield case 5 is usually attached to the chassis 1 in a state of being soldered to a printed circuit board (not shown). 1a is a boss provided on the front left and right side surfaces of the chassis 1, 2a is a boss provided on the protruding wall 2, and 2b is a projection. In addition, as shown in FIG.
A bent tongue piece 5a having a serrated tip 5b and a through hole 5c is formed.

Reference numeral 6 denotes a resin-molded rear panel.
a, 6a, 6b, 6c, 6c. Reference numeral 7 denotes a conductive cover bottom provided with tongue pieces 8, 8 having through holes 8a on the front left and right side surfaces and tongue pieces 9, 9 having through holes 9a on the right and left rear edges. Incidentally, the tongue pieces 8, 8 have θ as shown in FIG.
° (in the present case, 45 °) and the tongue pieces 9, 9 are bent at a right angle, so that when they are stacked, they can be almost overlapped with the thickness of the cover bottom 7, thus saving space during storage and transportation. To make it easier to handle. 10 is a through hole 10
It is a conductive cover top having a, 10a, 10b, and 10b.

Next, the assembly of the electronic device of the present invention will be described. When the rear panel 6 is fitted from the rear surface of the chassis 1, the through holes 6c, 6c engage with the projections 2b, 2b. At the same time, the sawtooth-shaped tip portion 5b of the shield case 5 penetrates the through hole 6b and peeks out. When the cover bottom 7 is put on the bottom surface of the chassis 1, the tongue pieces 8, 8 are bosses 1a, 1
a, the tongue pieces 9, 9 face the bosses 2a, 2a.

At this time, the saw-toothed tip portion 5b contacts the tongue piece 9. Also, since the tongue pieces 8, 8 are previously bent to 45 °, they are further bent to 90 ° by a finger or a jig or the like, covered with the cover top 10, and placed at predetermined locations 10a, 10a, 10b, 10b.
b and the like are screwed with the screw 11, and the above-described serrated tip 5
b reliably contacts the tongue piece 9. As a result, the cover bottom 7 is connected to the ground via the tongue piece 5a of the shield case 5 grounded to the power supply unit. Also, cover top 10
Is in contact with the tongue pieces 8, 8, 9, 9 and is grounded. According to the above configuration, the loop bottom of the cover bottom 7 and the cover top 10 can be reliably grounded without using a relay member for grounding.

[0011]

According to the present invention, the shield case connected to the ground of the power supply unit is provided with a tongue piece that looks out to the outer shell of the set, so that the cover member of the outer shell of the device can be easily looped without using a relay member for grounding. Grounding is possible, and the number of parts and the number of assembly operations are reduced. or,
Since the cover bottom can be stacked to approximately the plate thickness,
Space saving during transportation is achieved, and there is a cost advantage.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view.

FIG. 2 is an explanatory diagram of stacking cover bottoms.

FIG. 3 is an exploded perspective view of a ground connection portion.

[Explanation of symbols]

 Reference Signs List 1 chassis 1a boss 2a boss 5 shield case 5a projecting piece 6 rear panel 7 cover bottom 8 first tongue 9 second tongue 10 cover top

Claims (2)

(57) [Claims] 1. A shield case which is connected to the ground and shields a power supply unit, a chassis having mounting bosses on left, right and side surfaces and a rear surface, wherein the shield case is mounted on a rear portion, and attached to a rear portion of the chassis. A rear panel; a first tongue on the front left and right side edges; and a second tongue on the rear edge in contact with the rear panel, a cover bottom covering the bottom surface of the chassis, and a cover top covering the top surface of the chassis. The shield case is provided with a protruding piece penetrating through the rear panel and peeping out, and the chassis has a rear panel,
The ground connection structure for an electronic device, wherein when the cover bottom and the cover top are sequentially fitted and screwed, the protruding piece comes into contact with the second tongue piece. 2. The ground connection structure for an electronic device according to claim 1, wherein said first tongue is bent at approximately 45 °.