Abstract: A precision-enhanced laser engraving device includes a working platform, which defines at least one axial direction, a laser emission port being arranged at one side of the working platform; a magnetic scale, which is arranged in the axial direction and is provided with graduations; a focusing lens set, which is movably arranged on the magnetic scale; a driver mechanism, which drives the focusing lens set to move on the magnetic scale; and a reader, which is arranged on the focusing lens set and reads the graduations of the magnetic scale to provide an instantaneous position signal. By means of a combination of the magnetic scale and the reader, the instantaneous position signal can be acquired directly from the focusing lens set to thereby eliminate an issue of errors of the driver mechanism, such as a backlash of a belt, so as to realize precise movement of a laser engraving device.

Abstract: An electronic device includes a first body, a second body and a hinge assembly. The hinge assembly includes a bearing base, a movable base, a first hinge mechanism, a second hinge mechanism and a switching member. The bearing base is connected to the first body and has a first engaging portion. The first hinge mechanism is connected between the movable base and the second body. The second hinge mechanism is connected between the movable base and the bearing base. The first and second hinge mechanisms are connected to adjacent sides of the movable base. The switching member includes a main body slidably connected to the movable base in a switching direction, a second engaging portion engaged with or disengaged from the first engaging portion as the main body moves, and an interference portion entering or exiting the first hinge mechanism as the main body moves.

Abstract: An electronic device includes a first body, a second body and a hinge assembly. The hinge assembly includes a bearing base, a movable base, a first hinge mechanism, a second hinge mechanism and a switching member. The bearing base is connected to the first body and has a first engaging portion. The first hinge mechanism is connected between the movable base and the second body. The second hinge mechanism is connected between the movable base and the bearing base. The first and second hinge mechanisms are connected to adjacent sides of the movable base. The switching member includes a main body slidably connected to the movable base in a switching direction, a second engaging portion engaged with or disengaged from the first engaging portion as the main body moves, and an interference portion entering or exiting the first hinge mechanism as the main body moves.

Abstract: A metal housing (10) includes a base (110) and an outer layer (120). The base is made of a thin metal plate. The outer layer includes a plurality of first sections (121) and second sections (122). The material of the first sections is different from that of the second sections. The first sections and the second sections are arranged on the base in an interleaving manner.

Abstract: A metal housing (10) includes a base (110) and an outer layer (120). The base is made of a thin metal plate. The outer layer includes a plurality of first sections (121) and second sections (122). The material of the first sections is different from that of the second sections. The first sections and the second sections are arranged on the base in an interleaving manner.

Abstract: A metal housing (10) includes a first metal layer (11) and a second metal layer (12). The material of the first metal layer is selected from the group consisting of stainless steel, titanium and titanium alloy. The material of the second metal layer is selected from the group consisting of aluminum, aluminum alloy and magnesium alloy. The second metal layer is integrally formed with the first metal layer.