Abstract: A key triggering method is provided. The key triggering method is sensitive to trigger and suitable for fast repeated pressing. The key triggering method includes: presetting a trigger threshold; detecting, by a combination of a main controller and a sensor, a displacement stroke and displacement direction of a key; determining whether a movement distance of the key in a current displacement direction is greater than the trigger threshold; and switching the key between an on state and an off state according to a determination result. The key triggering method can sensitively identify a user's action for fast repeated pressing.

Abstract: The present disclosure belongs to the technical field of 3D printers, and a sunken 3D printer and a 3D printing method are disclosed. The sunken 3D printer comprises a main platform, a first linear driving mechanism, a second linear driving mechanism, a printing platform and an optical machine scraper assembly. The main platform comprises a horizontal platform and a vertical platform which are perpendicular to each other, and a resin tank is provided in the horizontal platform; and the first linear driving mechanism and the second linear driving mechanism are installed at the two ends of the vertical platform, the first linear driving mechanism is used for driving the printing platform to move up and down, and the second linear driving mechanism is used for driving the optical machine scraper assembly to move up and down.

Abstract: Disclosed is an amorphous nanocrystalline alloy strip. When the amorphous nanocrystalline alloy strip is cut into a plurality of narrow strips having a same width of less than or equal to 10 mm, a relative length difference among the plurality of narrow strips is not greater than 0.50%. Further disclosed is a method for manufacturing the amorphous nanocrystalline alloy strip. The amorphous nanocrystalline alloy strip has good surface flatness. The transverse temperature non-uniformity of molten steel inside a melting pool and the surface temperature non-uniformity of a cooling roller within a strip manufacturing position range are controlled in a process of manufacturing the amorphous nanocrystalline alloy strip, so that the surface flatness of the manufactured strip is improved. The manufacturing process is simple and convenient.

Abstract: The present disclosure belongs to the technical field of 3D printers, and a sunken 3D printer and a 3D printing method are disclosed. The sunken 3D printer comprises a main platform, a first linear driving mechanism, a second linear driving mechanism, a printing platform and an optical machine scraper assembly. The main platform comprises a horizontal platform and a vertical platform which are perpendicular to each other, and a resin tank is provided in the horizontal platform; and the first linear driving mechanism and the second linear driving mechanism are installed at the two ends of the vertical platform, the first linear driving mechanism is used for driving the printing platform to move up and down, and the second linear driving mechanism is used for driving the optical machine scraper assembly to move up and down.

Abstract: A key includes a cap, a spring, a magnet, a spring supporting device, an upper limit device, a lower limit device, a displacement detection device, and a displacement determination device; the spring is located below the cap and, the spring is disposed on the spring supporting device; the magnet is placed on either of the upper limit device or lower limit device; the spring is magnetically pressed against the magnet; the displacement detection device is mounted on the spring and moves between the upper limit device and lower limit device following deformation of the spring; the cap is configured to generate a click motion; the displacement determination device is located at one side of the displacement detection device; the device moves back and forth with respect to the displacement determination device following the movement of the spring; and the displacement determination device is electrically connected with an external circuit.

Abstract: A key includes a cap, a spring, a magnet, a spring supporting device, an upper limit device, a lower limit device, a displacement detection device, and a displacement determination device; the spring is located below the cap and, the spring is disposed on the spring supporting device; the magnet is placed on either of the upper limit device or lower limit device; the spring is magnetically pressed against the magnet; the displacement detection device is mounted on the spring and moves between the upper limit device and lower limit device following deformation of the spring; the cap is configured to generate a click motion; the displacement determination device is located at one side of the displacement detection device; the device moves back and forth with respect to the displacement determination device following the movement of the spring; and the displacement determination device is electrically connected with an external circuit.

Abstract: A gear-type key switch of a keyboard device of the present invention includes a key top, a holder member, four gears, a spring member, a film circuit board and a supporting plate. The spring member and the holder member are located above the supporting plate and below the key top. The film circuit board is located between the supporting plate and the spring member. The holder member forms four pairs of shafts and the four gears are respectively rotatably assembled to the four pairs of shafts. The key top forms at least four rack supporting members on a bottom thereof. The rack supporting members are respectively parallel to the four gears and engage with the four gears to provide the upward and downward movement of the key top. The gear-type key switch of a keyboard device is simple in structure, with low friction force and decreased height.