Most of laser pointer are wrapped with plastic or metal

 Most of laser pointer are wrapped with plastic or metal.
Series of emerging high-tech weaponry, who have advanced military technology, national security during the military struggle, will have greater and greater combat effectiveness of the initiative. Existence and development of military technology fundamental purpose is to combat and eliminate the impact on national security threats faced by a series of military, maintenance and protection of national security and interests. The latest developments in military technology will bring to the new national security threats. Modern technology, especially military reconnaissance satellites, remote sensing technology, satellites above the Earth over a thousand types of reconnaissance and communications satellites, the rest of the world was round, full-spectrum, full-time, full-dimensional surveillance and detection, the National Military sovereignty and border security threats facing the invisible invasion. laser pointer is normally varnished with superior oil paint.
Laser welding filler wire used, can greatly reduce the space requirements of the assembly. For example, thickness 2mm aluminum plate, if not using filler wire, sheet gap must be zero in order to obtain a good shape, such as the use φ1.6mm the wire as a filler metal, even if the gap to 1.0mm, but also to ensure that the weld good shape. In addition, the filler wire can also adjust the chemical composition or thick multi-layer welding.The composition of the laser head can be divided into two major parts, namely, ACT (torque control) section and the HS (base) part. ACT is the first implementation of laser components, real-time adjustment of the deviation between the objective lens and the disc is the core component of the laser head. It is divided into a fixed part of the movable part and fixed part of the main ACT frame, PCB, yoke, magnet, movable part of a lens, coil, four SPG (hanging line). The wilderness explorers can use laser pointer to guide themselves.
PCB board's function is flexible PCB cable to the feedback signal is passed to the hanging wire, so that the movable part of the ACT have focus and tracing exercise, find the disc channel. Magnet produces a magnetic field, so that energized coil in a magnetic field movement. Beam converging lens is matched with the CD-ROM information pits spot, DVD and VCD is a CD derived and developed laser digital video disc players, only through the objective lens to focus the laser transmitter LD information on the disc surface scan. In recent years, annual sales volume of China's growing trend VCD, laser head in the non-spherical lens all imported.
Laser power of negative feedback into real-time and non real-time negative feedback negative feedback two.