US Patent 8371866 Card connector

The present invention discloses a card connector which comprises an insulating body, a plurality of conductive terminals, an ejection mechanism, a tray, and a metal shell. The insulating body has a substrate. One side of the substrate is perforated to form a guide groove of which a bottom surface is a cylindrical surface. The ejection mechanism comprises a pushing shaft, a plurality of balls, a sliding bulk, and a pressing element. The pushing shaft, the plural balls, and the sliding bulk are slidably disposed in the guide groove. The plural balls are located between the pushing shaft and the sliding bulk and can be rolled sequentially. By the design of the ejection mechanism constructed by the pushing shaft, the plural balls, the sliding bulk, and the pressing element, the present invention has an advantage of making the card connector to be of a small size.