Abstract: A fiber optical coupler, configured to couple two optical fibers, includes a base and a lens. The base has an accommodation chamber and two light passing openings. The light passing openings are respectively connected to two opposite sides of the accommodation chamber. The lens is disposed in the accommodation chamber and located between the light passing openings. The optical fibers are configured to be respectively disposed on two opposite sides of the lens and respectively aligned with the light passing openings. Each of the two optical fibers has a core sharing an optical axis of the lens. When a numerical aperture is NA, an axial distance between the optical fiber and the lens is D, an effective radius of the lens is H, a focal length of the lens is f, half of a maximum angle of cone is ?, the following conditions are satisfied: ?=sin?1(NA); and D=2f=H/(2*tan ?).

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.

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.

Abstract: A separating electrical control water faucet is provided. The separating electrical control water faucet employs a water pipe in a hollow body of the faucet, and an electrical control module on an upper end of the body at a position higher than the water pipe, in which the electrical control module is positioned at a position higher than the water pipe. In such a way, even when a leakage occurs at the water pipe, the water leakage would not damage the electrical components or circuits of the electrical control module. A lifespan of the electrical control water faucet is thus prolonged.