Abstract: A key top comprising a key stem provided at a lower portion of the key top to be inserted into a rubber cup unit; and a first spring provided at a lower end of the key stem, and comprising a plate spring, wherein the key top is pushed down by finger pressure to turn on a contact point, thus executing key-in operation.

Abstract: A key top comprising a key stem provided at a lower portion of the key top to be inserted into a rubber cup unit; and a first spring provided at a lower end of the key stem, and comprising a plate spring, wherein the key top is pushed down by finger pressure to turn on a contact point, thus executing key-in operation.

Abstract: The key switch includes a key, a linkage assembly having first and second linking members with arms connected to outer ends thereof, and a bow-shaped elastic object connected between the arms, which is lowered and raised with the key, the first and second linking members including a coupling recess and a coupling protrusion and inner end thereof and hinge protrusions at side surfaces thereof, the coupling recess and protrusion being engaged with each other to constitute a linkage rotating shaft, a frame including hinge hooks engaged with the hinge protrusions, and an FPC placed on the frame for operation by contact with the linkage assembly. As the key is operated, the arms rotated downward while the linkage rotating shaft rises, and the elastic object gradually flattens and then bends into an upwardly convex bow shape, thereby providing a clicking sensation and a restoring force to the linkage assembly.

Abstract: A key switch adapted to raise or lower a key top according to need is disclosed. The key switch includes a key top, a link assembly comprised of two link members and operatively connected to the key top, which is retracted by a pressure on the key top and extended by release of the pressure and which has an elastic member at its lower end, an FPC placed on a frame of a keyboard to recognize pressing of the key top, and a plate movably placed on the FPC, to which a lower end of one of the link members is connected, and which has an elastic supporting member being in contact with the elastic member of the link assembly. When the key top is pressed down, the link assembly is retracted while compressing the elastic member of the link assembly and the elastic supporting member of the plate.

Abstract: A key switch able to provide a clicking sensation via a simplified structure is disclosed. The key switch includes a key to be pressed down, a linkage assembly having first and second linking members with arms connected to outer ends thereof, and a bow-shaped elastic object connected between the arms of the first and second linking members, which is lowered by pressure of the key and is raised together with the key by release of a pressure acting on the key, the first and second linking members including a coupling recess and a coupling protrusion at inner end thereof and hinge protrusions at side surfaces thereof, the coupling recess and protrusion being engaged with each other to constitute a linkage rotating shaft, a frame including hinge hooks engaged with the hinge protrusions of the first and second linking members, and an FPC placed on the frame to recognize a key-input operation by contact with the linkage assembly.

Abstract: A key switch adapted to raise or lower a key top according to need is disclosed. The key switch includes a key top, a link assembly comprised of two link members and operatively connected to the key top, which is retracted by a pressure on the key top and extended by release of the pressure and which has an elastic member at its lower end, an FPC placed on a frame of a keyboard to recognize pressing of the key top, and a plate movably placed on the FPC, to which a lower end of one of the link members is connected, and which has an elastic supporting member being in contact with the elastic member of the link assembly. When the key top is pressed down, the link assembly is retracted while compressing the elastic member of the link assembly and the elastic supporting member of the plate.

Abstract: Disclosed is a key switch comprising a key top for receiving pressure from a user's finger, a link for lowering the key top when pressure is applied to the key top and pushing the key top upwardly when the pressure is released, and a flexible printed circuit (FPC) provided on an upper surface of a keyboard frame for recognizing the key action by a pressing-contact of the link therewith. The link has first and second legs pivot-coupled with each other, a return plate spring applying a returning force to the key top, and a contact plate spring coming into pressing-contact with the FPC. The key switch has a simple structure and imparts a sufficient clicking sensation.

Abstract: Disclosed is a key switch comprising a key top for receiving pressure from a user's finger, a link for lowering the key top when pressure is applied to the key top and pushing the key top upwardly when the pressure is released, and a flexible printed circuit (FPC) provided on an upper surface of a keyboard frame for recognizing the key action by a pressing-contact of the link therewith. The link has first and second legs pivot-coupled with each other, a return plate spring applying a returning force to the key top, and a contact plate spring coming into pressing-contact with the FPC. The key switch of this invention has a simple structure and imparts a sufficient clicking sensation.