Abstract: A membrane circuit board includes a first membrane substrate, a spacer substrate, a second membrane substrate and a third membrane substrate. The first membrane substrate includes a first gas channel and a first conductive contact. The spacer substrate includes a first gas hole and a second gas hole. The second membrane substrate includes a second gas channel, a second conductive contact, a third gas hole and a fourth gas hole. The second gas channel is in communication with the third gas hole and the fourth gas hole. The second gas channel is in communication with the first gas channel through the first gas hole and the second gas hole. The third membrane substrate includes a third gas channel. The third gas channel is in communication with the second gas channel through the third gas hole and the fourth gas hole.

Abstract: A membrane circuit board includes a first membrane substrate, a spacer substrate, a second membrane substrate and a third membrane substrate. The first membrane substrate includes a first gas channel and a first conductive contact. The spacer substrate includes a first gas hole and a second gas hole. The second membrane substrate includes a second gas channel, a second conductive contact, a third gas hole and a fourth gas hole. The second gas channel is communication between the third gas hole and the fourth gas hole. The second gas channel is in communication with the first gas channel through the first gas hole and the second gas hole. The third membrane substrate includes a third gas channel. The third gas channel is in communication with the second gas channel through the third gas hole and the fourth gas hole.

Abstract: A key structure includes a base plate, a key pedestal, a switch element and a keycap. The key pedestal includes an opening and at least one elastic element. The keycap includes a triggering post and at least one contacting part. The key pedestal is installed on the base plate. The switch element is installed on the base plate and disposed within the opening of the key pedestal. The triggering post of the keycap is inserted into the opening of the key pedestal. The switch element can be triggered by the triggering post. The elastic element of the key pedestal is aligned with the corresponding contacting part. The contacting part of the keycap is continuously pushed against the corresponding elastic element of the key pedestal. Consequently, the keycap is maintained in a horizontal state and not tilted.

Abstract: A keyboard device includes plural key structures. Each key structure includes a base plate, a keycap, a membrane circuit board, a connecting member and an elastic element. The keycap includes a pressing post. The membrane circuit board is arranged between the base plate and the keycap. The connecting member is penetrated through the membrane circuit board and connected between the keycap and the base plate. The keycap is movable upwardly or downwardly relative to the membrane circuit board. The elastic element is arranged between the keycap and the membrane circuit board. The elastic element includes a resilience piece and plural supporting ribs. The plural supporting ribs are arranged between the resilience piece and the keycap. The plural supporting ribs are contacted with the pressing post of the keycap. Consequently, there is a gap between the pressing post and the resilience piece.

Abstract: A key structure includes a keycap, a base plate and a connecting element. The keycap includes a sliding groove located at a bottom side the keycap. A top surface of the sliding groove faces a portion of the bottom surface of the keycap. Moreover, at least one of the top surface of the sliding groove and the portion of the bottom surface of the keycap is a slant surface. The base plate is located under the keycap. The connecting element is connected between the keycap and the base plate.

Abstract: A keyboard device includes a base plate, a membrane circuit board and a key. The key includes a keycap, a connecting assembly, a first stabilizer bar and a second stabilizer bar. The connecting assembly is connected between the keycap and the base plate. The first stabilizer bar and the second stabilizer bar are connected between the keycap and the connecting assembly. While the keycap is moved upwardly or downwardly relative to the base plate, the first stabilizer bar and the second stabilizer bar are swung to stabilize the key. Since the first stabilizer bar and the second stabilizer bar are connected between the keycap and the connecting assembly, the first stabilizer bar and the second stabilizer bar will not readily collide with or knock on the base plate. During the operation, the generated noise is reduced. Consequently, the operating comfort to the user is enhanced.

Abstract: A keyboard device includes a base, a wing-type connecting element and a keycap. The base plate includes a close-type connecting bracket. The wing-type connecting element includes a first frame and a second frame. A connecting shaft of the second frame is received within the close-type connecting bracket. Consequently, the wing-type connecting element is connected with the base plate. While the keycap is depressed, the connecting shaft is only allowed to be rotated and limited within the close-type connecting bracket. Since the swinging range of the wing-type connecting element is reduced, the keyboard device of the present invention is capable of improving the depressing stability of the keycap.

Abstract: A keyboard device includes a base, a wing-type connecting element and a keycap. The base plate includes a close-type connecting bracket. The wing-type connecting element includes a first frame and a second frame. A connecting shaft of the second frame is received within the close-type connecting bracket. Consequently, the wing-type connecting element is connected with the base plate. While the keycap is depressed, the connecting shaft is only allowed to be rotated and limited within the close-type connecting bracket. Since the swinging range of the wing-type connecting element is reduced, the keyboard device of the present invention is capable of improving the depressing stability of the keycap.

Abstract: A key structure includes a base plate, a structural plate, a sound generation assembly and a keycap. The structural plate is installed on the base plate. The sound generation assembly includes a shaft body and a cantilever element. The cantilever element is protruded from a side of the shaft body. The structural plate is covered by the keycap. The keycap includes a first protrusion post and a second protrusion post. A first space and a second space are formed between the first protrusion post and the second protrusion post. The first space and the second space are not aligned with each other. The cantilever element is movable within the first space and the second space. Consequently, the feedback of a click sound is generated.

Abstract: A key structure includes a base plate, a structural plate, a sound generation assembly and a keycap. The structural plate is installed on the base plate. The sound generation assembly includes a shaft body and a cantilever element. The cantilever element is protruded from a side of the shaft body. The structural plate is covered by the keycap. The keycap includes a first protrusion post and a second protrusion post. A first space and a second space are formed between the first protrusion post and the second protrusion post. The first space and the second space are not aligned with each other. The cantilever element is movable within the first space and the second space. Consequently, the feedback of a click sound is generated.

Abstract: The present invention relates to a keyboard, including a baseboard, connecting elements, and replaceable keys. The replaceable key includes a connecting plate and a key cap. The connecting plate has a first fixing portion, and the key cap has a second fixing portion. The connecting element is separately connected to the baseboard and the connecting plate, and the key cap and the connecting plate may be combined by means of the first fixing portion and the second fixing portion. Therefore, the user does not contact a connecting element when disassembling a key cap, so that the connecting element is not damaged and the key cap is easy to disassemble and assemble.

Abstract: A key structure includes a base, a triggering element, a keycap and a scissors-type connecting element. The keycap is disposed over the triggering element. When an external force is applied to the keycap, the triggering element is pushed by the keycap. The scissors-type connecting element is connected with the keycap and the base. The scissors-type connecting element includes a first frame and a second frame. The first frame includes a keycap post, a base post and a bulge. The bulge is externally extended from a first end of the first frame and located at a side of the keycap post, and the bulge is protruded from a sidewall of the first frame. Due to the bulge, the structured strength of the keycap post is enhanced.

Abstract: A key structure includes a connecting plate, a keycap, a triggering element, a scissors-type connecting element, a membrane switch circuit member, and a supporting plate. The keycap includes a protrusion part. The supporting plate includes an accommodation part and an elastic structure. The elastic structure is aligned with the protrusion part and disposed within the accommodation part. When the keycap is depressed, the protrusion part is moved with the keycap to push the triggering element. Consequently, the membrane switch circuit member is triggered by the triggering element. Moreover, as the protrusion part is moved with the keycap, the protrusion part collides with the elastic structure to generate a sound.

Abstract: A key structure includes a connecting plate, a keycap, a triggering element, a scissors-type connecting element, a membrane switch circuit member, and a supporting plate. The keycap includes a protrusion part. The supporting plate includes an accommodation part and an elastic structure. The elastic structure is aligned with the protrusion part and disposed within the accommodation part. When the keycap is depressed, the protrusion part is moved with the keycap to push the triggering element. Consequently, the membrane switch circuit member is triggered by the triggering element. Moreover, as the protrusion part is moved with the keycap, the protrusion part collides with the elastic structure to generate a sound.

Abstract: A key structure includes a base, a triggering element, a keycap and a scissors-type connecting element. The keycap is disposed over the triggering element. When an external force is applied to the keycap, the triggering element is pushed by the keycap. The scissors-type connecting element is connected with the keycap and the base. The scissors-type connecting element includes a first frame and a second frame. The first frame includes a keycap post, a base post and a bulge. The bulge is externally extended from a first end of the first frame and located at a side of the keycap post, and the bulge is protruded from a sidewall of the first frame. Due to the bulge, the structured strength of the keycap post is enhanced.

Abstract: A microswitch keyboard includes a circuit board, a supporting plate and plural keys. Each of the keys includes a keycap, a microswitch element and a connecting element. The supporting plate is disposed on the circuit board. The plural keys are connected with the supporting plate. The microswitch element of each key is disposed under the keycap and connected with the circuit board. The connecting element is disposed under the keycap and arranged around the microswitch element. Moreover, by the connecting element, the keycap is fixed on the supporting plate and guided to be moved upwardly or downwardly relative to the supporting plate. When the keycap is pressed, the microswitch element is triggered to generate a corresponding switch signal.

Abstract: A keycap structure includes a reinforcement element and a keycap body. The reinforcement element includes two long segments and two short segments. The keycap body includes plural fixing parts and two protruding parts. The plural fixing parts are used for fixing two ends of each long segment of the reinforcement element. The two protruding parts are used for pushing the two short segments of the reinforcement element, so that the reinforcement element is subjected to deformation. Consequently, the reinforcement element generates a reacting force to push against the bilateral sides of the keycap body. Under this circumstance, the top surface of the keycap body is formed as a downwardly-concave arc-shaped surface, so that the shape of the keycap structure is effectively corrected.

Abstract: A keycap structure includes a reinforcement element and a keycap body. The reinforcement element includes two long segments and two short segments. The keycap body includes plural fixing parts and two protruding parts. The plural fixing parts are used for fixing two ends of each long segment of the reinforcement element. The two protruding parts are used for pushing the two short segments of the reinforcement element, so that the reinforcement element is subjected to deformation. Consequently, the reinforcement element generates a reacting force to push against the bilateral sides of the keycap body. Under this circumstance, the top surface of the keycap body is formed as a downwardly-concave arc-shaped surface, so that the shape of the keycap structure is effectively corrected.

Abstract: A key structure with a scissors-type connecting member is provided. The key structure includes a base plate, a scissors-type connecting member, and a keycap. The scissors-type connecting member includes a first frame and a second frame. The first frame includes a rotating shaft and an extension bulge. The second frame includes a receiving recess and a position-limiting cavity. For combining the first frame with the second frame, the rotating shaft is inserted into the receiving recess and the extension bulge is inserted into the position-limiting cavity. Consequently, a rotating range of the extension bulge is limited.

Abstract: A key structure with a scissors-type connecting member is provided. The scissors-type connecting member includes a first frame and a second frame. The first frame includes a rotating shaft and a pushing bulge. After the first frame is stacked on the second frame, if the second frame may be pushed by the pushing bulge, the second frame is subject to deformation to facilitate combining the first frame and the second frame together.