-cone Lens is a typical aspheric Optics element, with a conical rotational symmetry structure and axial symmetry, its central axis and Optical Axis coincide, can achieve the beam of linear focus. A beam of parallel light is vertically irradiated onto the cone Lens, and the cone Lens is converted into a Bessel beam. Bessel beam is a special non-Diffraction beam with small spot size and large focus depth. The positive cone Lens is used to produce a non-Diffraction Bessel beam, and the negative cone Lens is used to diverge the beam.