Optical fiber is a light transmission tool that uses the principle of total reflection of light in fibers made of glass or plastic. Since the transmission loss of light in optical fibers is much lower than that of electricity in wires, optical fibers are used as Long-distance information transmission is widely used in modern industry. Therefore, many industrial chains based on optical fibers have grown, including light detection laser pointers used to detect optical fiber failures. Lasers are emitted from one end of the optical fiber and received at the other end for detection. Whether the optical fiber is broken, the traditional optical fiber detection laser pointer focuses on the function, and there are many shortcomings in the design and man-machine, and the green laser pointer color cannot be changed, which has been unable to meet people's needs well.
Various laser pointers are already known and have appeared on the market. As shown in the figure. Figure 6 illustrates the laser module and the laser emitting lens assembly for the laser pointer according to the prior art. This laser emitting lens assembly includes a lens holder for fixing the laser shooting lens. This laser module includes a laser diode controlled to generate a high powered laser beam. The external thread on one end of the lens holder is screwed into the internal thread on the lens holder. Laser module. Adjust the focal length of the module in either direction of the laser by turning the lens holder. Because the lens holder and laser module are manufactured separately and then fixed together, it is difficult to obtain the concentricity accurately.