Electronic device and slide positioning mechanism thereof

A slide positioning mechanism for an electronic device which includes a base cover with a concealed area, and a cover plate that has a front marginal region and that is slidable relative to the base cover in a longitudinal direction among a closed position, where the front marginal region covers the concealed area, an open position, where the front marginal region exposes the concealed area, and a transition position between the closed and open positions, said slide positioning mechanism being disposed between the base cover and the cover plate to permit the cover plate to be slidably positioned relative to said base cover in a selected one of the closed and open positions, slide positioning mechanism comprising:

• a base frame mounted on the base cover;
• a guided frame mounted beneath the cover plate to slide therewith, and configured to be slidably guided by said base frame so as to permit the cover plate to be guided to slide relative to the base cover;
• and
• at least one positioning assembly including a first magnetically attractive unit and a second magnetically attractive unit, said first magnetically attractive unit being mounted on and outboard of said base frame, and having a plurality of first magnetically attractive members arranged in tandem in the longitudinal direction, said second magnetically attractive unit being mounted beneath the cover plate to slide therewith, and having a plurality of second magnetically attractive members arranged in tandem in the longitudinal direction, said first and second magnetically attractive members respectively having north poles and south poles oriented such that when the cover plate is moved to the selected one of the closed and open positions, a relatively strong force of attraction is generated between said first and second magnetically attractive units so as to position the cover plate in the selected one of the closed and open positions, and such that once the cover plate is displaced to the transition position, a relatively strong force of repulsion is generated between said first and second magnetically attractive units to facilitate movement of the cover plate away from the transition position,
• wherein
• said base frame has
• a base body with two body ends opposite to each other in a transverse direction relative to the longitudinal direction,
• a pair of groove bottom walls each extending from a respective one of said body ends in a direction transverse to both the longitudinal direction and the transverse direction to terminate at a wall edge, and
• a pair of groove lateral walls extending respectively from said wall edges of said groove bottom walls toward each other to form, in cooperation with base body and said groove bottom walls, two elongated grooves which respectively extend in the longitudinal direction;
• said guided frame has two guided marginal regions configured to be slidably retained in said elongated grooves, respectively, so as to permit said cover plate to be guided to slide relative to said base cover;
• said positioning assembly further includes
• a first mounting seat disposed on and outboard of one of said groove bottom walls, and having a first mounting surface, and
• a second mounting seat mounted beneath said cover plate to slide therewith, and having a second mounting surface which confronts said first mounting surface, and
• said first and second magnetically attractive units are respectively mounted on said first and second mounting surfaces to confront each other.