Electronic device with conductive resilient sheet

An electronic device includes a supporting member, a circuit board fixed to the supporting member, a bottom cover assembled with the supporting member, and at least one conductive resilient sheet fixed on the circuit board. The conductive resilient sheet includes a fixing portion fixed on the circuit board and a conductive portion. The conductive portion defines a first elastic sheet and a second elastic sheet. The bottom cover is fixed between the first elastic sheet resisting the outer side of the bottom cover and the second elastic sheet resisting the inner side of the bottom cover.

BACKGROUND

1. Technical Field

The present disclosure relates to electronic devices, particularly to an electronic device with a plurality of conductive resilient sheets for electromagnetic interference (EMI) shielding.

2. Description of Related Art

In the enclosure of a typical electronic device, there are many kinds of electronic components, such as central processing units and accelerated chips, mounted in a circuit board of the enclosure. The electronic components may emit electromagnetic radiation when operating, such that electromagnetic interference between the electronic components occurs. Some of the electronic components in the enclosure may work abnormally due to EMI. To decrease or overcome the EMI of the enclosure, a conductive resilient sheet is provided to connect the circuit board of an electronic device with the housing. The conductive resilient sheet can reduce or even stop EMI that is produced by the circuit board effectively.

However, poor contact of the conductive resilient sheet and the housing often occurs when an external force shakes the electronic device.

Therefore, there is room for improvement in the art.

DETAILED DESCRIPTION

Referring toFIG. 1andFIG. 2, an embodiment of an electronic device100includes a supporting member12, a circuit board13fixed to the supporting member12, a bottom cover14and two conductive resilient sheets16for EMI shielding. The supporting member12is fixed to the bottom cover14at one side of the bottom cover14. The two conductive resilient sheets16are both fixed on the circuit board13and resist the bottom cover14. The electronic device100may be a notebook computer, a desktop computer, a liquid crystal display, or other electronic devices. In the illustrated embodiment, the electronic device100is a DVD video player.

The supporting member12can be a substantially elongated rectangular sheet. The supporting member12includes a base portion120and four side walls121,122,123,124extending upward from four edges of the base portion120. The base portion120and the four side walls121,122,123,124cooperatively define a cavity125to receive the circuit board13. The side walls122,124are opposite to each other. Each of the side walls122,124forms an engaging portion1220extending out from a top end of the side walls122,124. Each of the engaging portions1220defines a locking hole1222and a latching hole1224aligned separate from the locking hole1222adjacent to a top of each of the engaging portions1220.

The bottom cover14includes a bottom plate142, a first side frame144and a second side frame146extending upward from two opposite edges of the bottom plate142. Each of the side frames144,146forms a latching hook1440corresponding to the latching holes1224of the two engaging portions1220. Each of the latching hooks1440is formed at an end of each side frames144,146adjacent to the supporting member12. Each side frames144,146further defines a positioning hole1442corresponding to one locking hole1222adjacent to and apart from the latching hook1440.

Referring toFIG. 3, the conductive resilient sheet16is made of conductive materials and can be formed by punching. Each of the sheets16includes a fixing portion162, a U-shaped connecting portion163, and a conductive portion164. The conductive portion164extends from an end of the connecting portion163along the same plane. The fixing portion162extends from the other end of the connecting portion163and bends outward substantially perpendicularly to the conductive portion164. The fixing portion162defines two fixing holes1622arranged apart. The sheet16is fixed on the circuit board13with two screws (not shown) extending through the corresponding fixing holes1622. The conductive portion164defines a first through hole1640and a second through hole1641. The two through holes1640,1641are arranged apart and adjacent to an edge of the conductive portion164and away from the connecting portion163. A first elastic sheet1642and a second elastic sheet1644are formed on the conductive portion164toward the fixing portion162. The sheet1642extends out from an inner side wall1643of the through hole1640apart from the connecting portion163. The sheet1644extends out from an inner side wall1645of the through hole1641adjacent to the connecting portion163.

During the assembly of the electronic device100, the circuit board13is fixed in the cavity125, and the sheet16is fixed on the circuit board13with two screws extending through the corresponding fixing holes1622. The bottom cover14moves toward the supporting member12until the latching hooks1440engage with the latching holes1224correspondingly. Two bolts (not shown) extend through the locking holes1222,1442correspondingly to lock the supporting member12to the bottom cover14.

Referring toFIG. 4, the fixing portion162is fixed on the circuit board13. The supporting member12is fixed to the bottom cover14at one side of the bottom cover14, and an edge of the bottom plate142adjacent to the supporting member12is inserted between the sheet1642and the sheet1644. At this time, the first elastic sheet1642resists an outer surface of the bottom plate142and the second elastic sheet1644resists an inner surface of the bottom plate142. When an external force shakes the electronic device100, the bottom cover14will always maintain contact with the circuit board13.