Abstract: A membrane circuit structure having a plurality of switch regions includes first, second and third membranes and a spacer layer. The second membrane is beneath the first membrane, and a lower surface of the second membrane is provided with a conductive pattern in at least one of the switch regions. The spacer layer is disposed between the first and second membranes. The third membrane is beneath the second membrane, and an upper surface of the third membrane is provided with first and second trigger portions separated from each other in the at least one of the switch regions, and the conductive pattern is able to be in contact with the first and second trigger portions, so that the first and second trigger portions are able to be electrically connected to each other through the conductive pattern.

Abstract: A key structure includes a base plate, a switch element, a key pedestal and a keycap. The key pedestal includes an opening, a first hooking structure and a second hooking structure. The keycap includes an edge part, a triggering post, a third hooking structure and a fourth hooking structure. The third hooking structure and the fourth hooking structure are installed on the edge part. The switch element is installed on the base plate. The key pedestal is installed on the base plate. The triggering post is inserted into the opening to trigger the switch element. The third hooking structure of the keycap is movably connected with the first hooking structure of the key pedestal. The fourth hooking structure of the keycap is movably connected with the second hooking structure of the key pedestal. Consequently, the keycap is maintained in a horizontal state and not tilted.

Abstract: A key structure includes a membrane circuit board, an elastic element and a high impedance layer. The membrane circuit board includes a lower plate, an upper plate, a spacer plate and a circuit layer. The upper plate is located over the lower plate. The upper plate has an opening through the upper plate. The spacer plate is arranged between the lower plate and the upper plate. The circuit layer is arranged between the spacer plate and the upper plate. The elastic element is disposed on the membrane circuit board and substantially aligned with opening. The high impedance layer is disposed on a bottom surface of a bottom part of the elastic element and disposed within the opening of the upper plate. The high impedance layer is in contact with a part of the circuit layer.

Abstract: A keyboard device includes plural key structures. Each key structure includes a keycap, a membrane circuit board, a key frame, an elastic conduction element and a connecting member. The membrane circuit board is located under the keycap. The key frame is arranged between the keycap and the membrane circuit board. The key frame includes a frame body and a bottom plate. The bottom plate is arranged between the key frame and the membrane circuit board. The bottom plate includes a perforation. The elastic conduction element is arranged between the keycap and the bottom plate of the key frame. The perforation is covered by the elastic conduction element. The connecting member is arranged between the keycap and the bottom plate of the key frame. The keycap is movable upwardly or downwardly relative to the bottom plate of the key frame through the connecting member.

Abstract: A key structure includes a circuit board, a triggering part and an elastic element. The elastic element includes an upper support portion, a lower support portion, an upper elastic portion and a lower elastic portion. The lower support portion is located beneath the upper support portion and connected to a peripheral region of the circuit board. The upper elastic portion is connected between the triggering part and the upper support portion. The lower elastic portion is connected between the upper support portion and the lower support portion. The lower elastic portion includes a first section and a second section connected to each other. The first section is connected to the upper support portion. The second section is connected to the lower support portion. There is a vacant space between the second section and the circuit board.

Abstract: A keyboard device includes plural key structures. Each key structure includes a supporting plate, a keycap, a connecting member and a hook element. The keycap is located over the supporting plate, and movable upwardly or downwardly relative to the supporting plate. The connecting member is connected between the supporting plate and the keycap. The hook element is installed on the supporting plate. The connecting member is connected with the supporting plate through the hook element. The supporting plate is made of a first material with a first specific gravity. The hook element is made of a second material with a second specific gravity. The second specific gravity is higher than the first specific gravity.

Abstract: A keycap forming method includes the following steps. Firstly, a stabilizer bar is formed through a first male mold and a first female mold according to an injection molding process, and a keycap is formed through a second male mold and a second female mold according to the injection molding process. Then, the stabilizer bar is fixed on the first male mold, and the keycap is fixed on the second female mold. Then, the first male mold and the second female mold are stacked on each other, so that the stabilizer bar and the keycap are combined together. Then, the first male mold and the second female mold are separated from each other, so that the stabilizer bar is detached from the first male mold. By using the keycap forming method, it is not necessary to manually assemble the stabilizer bar with the keycap.

Abstract: A key structure includes a keycap, a supporting plate, a connecting element, a circuit board and an elastic element. The circuit board is disposed on the supporting plate. The circuit board includes a switch element. A first switch unit of the switch element is formed on a top surface of a first film layer of the circuit board. A second switch unit of the switch element is formed on a top surface of a second film layer of the switch element. When the keycap is depressed in response to an external force, the elastic element is subjected to deformation. Consequently, the first switch unit and the second switch unit are selectively turned on to generate a first key signal and a second key signal.

Abstract: The present invention provides a keyboard device, including a plurality of keys, thin film circuit boards, and key bottom plates. A connection component of the key is connected between a keycap of the key and a bottom plate connection portion of key bottom plate, and the bottom plate connection portion has a connection portion surface corresponding to the keycap and a raised portion formed on the connection portion surface. When the keycap moves downward relative to the thin film circuit board, a lower surface of the keycap knocks the raised portion.

Abstract: A keycap forming method includes the following steps. Firstly, a stabilizer bar is formed through a first male mold and a first female mold according to an injection molding process, and a keycap is formed through a second male mold and a second female mold according to the injection molding process. Then, the stabilizer bar is fixed on the first male mold, and the keycap is fixed on the second female mold. Then, the first male mold and the second female mold are stacked on each other, so that the stabilizer bar and the keycap are combined together. Then, the first male mold and the second female mold are separated from each other, so that the stabilizer bar is detached from the first male mold. By using the keycap forming method, it is not necessary to manually assemble the stabilizer bar with the keycap.

Abstract: The present invention provides a keyboard device, including a plurality of keys, thin film circuit boards, and key bottom plates. A connection component of the key is connected between a keycap of the key and a bottom plate connection portion of key bottom plate, and the bottom plate connection portion has a connection portion surface corresponding to the keycap and a raised portion formed on the connection portion surface. When the keycap moves downward relative to the thin film circuit board, a lower surface of the keycap knocks the raised portion.

Abstract: The present invention relates to a keyboard, including a base plate, a switch circuit board, a connecting element, a keycap, and a connecting shaft. The switch circuit board is disposed on the base plate, the connecting element is located on the switch circuit board and is separately connected to the keycap and the base plate, the connecting shaft is disposed on the connecting element and extends from the connecting element to be connected to the base plate. When the keycap is pressed and the connecting element swings, the connecting shaft rotates and is separately in contact with the base plate and the switch circuit board, so as to weaken the shake of the connecting element. Therefore, the operation stability of the keyboard can be improved.

Abstract: A luminous keyboard includes an illumination module, a keycap and plural light-guiding structures. The illumination module generates a light beam. The keycap includes a character/symbol region. The plural light-guiding structures are disposed on a bottom surface of the specified keycap and aligned with the character/symbol region. The light beam to be projected to the specified keycap is guided to the character/symbol region by the light-guiding structures. The light-guiding structures of the luminous keyboard are arranged according to the layout of the character/symbol regions in different countries. It is not necessary to change the light-guiding structures of the light guide plate according to the layout of the character/symbol regions of different countries.