Abstract: A key structure includes a base plate, a keycap, a membrane circuit board and an elastic plate. The keycap is located over the base plate. The keycap includes a top wall and a skirt part. The membrane circuit board is arranged between the keycap and the base plate. The membrane circuit board includes a pressure sensing structure. The elastic plate is arranged between the keycap and the membrane circuit board. The elastic plate includes a triggering part. The triggering part is extended toward the membrane circuit board and aligned with the pressure sensing structure. While the keycap is moved downwardly toward the elastic plate, the skirt part of the keycap is correspondingly moved to press the elastic plate. Consequently, the triggering part is moved downwardly to press the pressure sensing structure.

Abstract: A manufacturing method of a membrane circuit board includes the following steps. Firstly, a screen plate, a first substrate body and a second substrate body are provided. Then, a conductive paste and a first circuit pattern are formed on the screen plate. Then, the conductive paste and the first circuit pattern are simultaneously printed on the first substrate body by a screen printing process. The first substrate body, the first circuit pattern and the conductive paste are collaboratively formed as a first membrane substrate. Then, a second circuit pattern is formed on the screen plate. Then, the second circuit pattern is printed on the second substrate body by the screen printing process. The second substrate body and the second circuit pattern are collaboratively formed as a second membrane substrate. Then, the second membrane substrate is aligned with the first membrane substrate.

Abstract: The present disclosure provides a keycap, including: a light-guiding microstructure layer made of a first material, the light-guiding microstructure layer including a base layer and a plurality of microstructures disposed on a lower surface of the base layer; and a light-transmitting layer disposed over the light-guiding microstructure layer and in contact with the base layer, the light-transmitting layer being made of a second material different from the first material. The present disclosure further provides a method of manufacturing the above-mentioned keycap and a key structure including the above-mentioned keycap.

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 keycap, a scissors-type connecting element, a first knocking part, a resilience element and a second knocking part. The scissors-type connecting element is coupled to a bottom surface of the keycap. The scissors-type connecting element includes an inner frame and an outer frame. The first knocking part is disposed within a space surrounded by the inner frame. The resilience element is located under the first knocking part. The second knocking part is coupled to the bottom surface of the keycap and faces the first knocking part. While the keycap is pressed down, the second knocking part knocks on the first knocking part, and the first knocking part is moved downwardly. When the keycap is not pressed down, the first knocking part is moved upwardly and returned to an original position in response to an elastic force of the resilience element.

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 key structure includes a keycap, a scissors-type connecting element, a first knocking part, a resilience element and a second knocking part. The scissors-type connecting element is coupled to a bottom surface of the keycap. The scissors-type connecting element includes an inner frame and an outer frame. The first knocking part is disposed within a space surrounded by the inner frame. The resilience element is located under the first knocking part. The second knocking part is coupled to the bottom surface of the keycap and faces the first knocking part. While the keycap is pressed down, the second knocking part knocks on the first knocking part, and the first knocking part is moved downwardly. When the keycap is not pressed down, the first knocking part is moved upwardly and returned to an original position in response to an elastic force of the resilience element.

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 base plate, a supporting element, a resilience arm and a keycap. The keycap includes a bulge. The supporting element is installed on the base plate. The resilience arm is connected with the supporting element and aligned with the bulge of the keycap. The keycap is connected with the supporting element. When the keycap is moved toward the base plate, the bulge is moved downwardly to push the resilience arm. After the resilience arm is pushed by the bulge, the resilience arm is subjected to elastic deformation and separated from the bulge. After the resilience arm is separated from the bulge, the resilience arm knocks on the keycap, so that a sound is generated.

Abstract: A keyboard device includes plural key structures. Each key structure includes a base plate, a keycap, a connecting member and at least one raised structure. The keycap is located over the base plate. The connecting member is arranged between the base plate and the keycap. The keycap is movable upwardly or downwardly relative to the base plate through the connecting member. The connecting member includes at least one first hook part. The raised structure is installed on the base plate. The first hook part is connected with the raised structure. The raised structure includes a top wall, a lateral wall and a perforation. The lateral wall is connected between the top wall and the base plate. The perforation is formed in the lateral wall. The first hook part is penetrated through the perforation and contacted with the top wall.

Abstract: A key structure includes a membrane switch, a keycap and an elastic conduction element. The keycap is located over the membrane switch. The elastic conduction element is arranged between the keycap and the membrane switch. The elastic conduction element includes a supporting cover and a conduction post. The conduction post is connected with the supporting cover and disposed within an accommodation space of the supporting cover. The conduction post includes a first contacting part, a second contacting part and a concave part. While the keycap is moved downwardly relative to the membrane switch, the supporting cover is compressed by the keycap and the conduction post is correspondingly moved downwardly. Consequently, the first contacting part and the second contacting part are contacted with the membrane switch, and a suction force between the concave part and the membrane switch is generated.

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 key structure includes a keycap, a membrane circuit board, and a rubber dome between the keycap and the membrane circuit board. The rubber dome includes a ring-shaped structure, a lower foundation structure, a contacting post, a first inclined wall and a second inclined wall. The ring-shaped structure includes a first top surface. The first top surface is upwardly pushed against the keycap. The lower foundation structure includes a first bottom surface. The first bottom surface is pushed downwardly pushed against the membrane circuit board. The contacting post is connected with the ring-shaped structure. The first inclined wall is connected with the ring-shaped structure and the lower foundation structure. The second inclined wall is connected with the ring-shaped structure and the contacting post. There is a first included angle ?1 between the second inclined wall and the first bottom surface. Preferably, 30°??1?85°.

Abstract: A key structure includes a keycap and a scissors-type connecting element. The scissors-type connecting element is connected with the keycap. The scissors-type connecting element includes an inner frame and an outer frame. A first end of the inner frame is connected with the keycap. The outer frame is connected with the inner frame and swingable relative to the inner frame. A first end of the outer frame is connected with the keycap and located near a second end of the inner frame. A second end of the inner frame includes a first protrusion. A first end of the outer frame includes a second protrusion near the first protrusion. The first protrusion includes a first knocking surface. The second protrusion includes a second knocking surface. While the keycap is pressed down, the first knocking surface and the second knocking surface knock on each other.

Abstract: A luminous keyboard includes a keyboard module and a backlight module. The backlight module is located under the keyboard module. The backlight module includes a light source, a light guide plate and a reflecting plate. The light source includes a conductive substrate and plural light-emitting elements. The light guide plate includes a light input surface, a light exit surface, a bottom surface and a first slot. The light input surface is disposed within the first slot. The reflecting plate is disposed on the bottom surface of the light guide plate. The reflecting plate includes a second slot. The second slot is in communication with the first slot. The conductive substrate is penetrated through the second slot and the first slot. Consequently, the plural light-emitting elements are accommodated within the first slot and aligned with the light input surface.

Abstract: A keyboard device includes plural key structures. Each key structure includes a plate assembly, a keycap assembly, an elastic element, a connecting member and a signal generator. The plate assembly includes a membrane switch. The keycap assembly is located over the plate assembly. The elastic element is arranged between the plate assembly and the keycap assembly. The connecting member is arranged between the plate assembly and the keycap assembly. The connecting member includes a triggering part. The signal generator is installed on the plate assembly. While the keycap assembly is moved toward the plate assembly through the connecting member, the triggering part is moved downwardly to trigger the signal generator to generate a first signal. After the signal generator is triggered, the keycap assembly is continuously moved downwardly and the membrane switch is triggered to generate a second signal.

Abstract: A key structure includes a keycap, a base plate and a wing-type supporting element. When the keycap is depressed in response to an external force, a first frame and a second frame of the wing-type supporting element are pushed by each other through protrusion structures and rotating shafts. Consequently, the first frame and the second frame can be swung relative to 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 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.