No drive is needed to be installed for laser pointer

So why do we also see non-luminous objects? Because the light emission of the light shines on them, non-luminous objects by light, the diffuse reflection of light in all directions into the goal of our eyes so we can also see non-luminous objects. Of laser light and ordinary light is significantly different. Such as ordinary incandescent light source is the current heated tungsten atom to the excited state, in the excited states of atomic spontaneous emission and light-emitting. This ordinary light scattering and diffuse, and can not control the formation of the focused beam, it can not be used in laser printers. The laser beam laser printer must have the following characteristics. No drive is needed to be installed for laser pointer .
A certain kind of light conductor, only the light of a regional spectrum of light perception high, leaving the region, possible loss of light sensitivity. Photosensitive semiconductor optical wavelength range applicable, will light the formation of an absorption peak. Photoconductivity peak within the best results. It with light illumination. The higher illumination, the carrier generated by the more, the optical conductivity is higher. However, the characteristics of each photoconductor different under the same conditions, to achieve the illumination of the same optical conductivity indicators are different. Drum commonly used photoconductive material cadmium sulfide (CdS), selenium - arsenic (Se-As). Organic photoconductive material (the opc) and several. The warranty of laser pointer contains the replacement requirement of laser pointer .   Production of drum used in the photoconductive material, should have the following characteristics: good wear resistance. Photoconductor surface to have a certain hardness to withstand the mechanical wear in the developing transfer and cleaning process. If the drum (photoconductor) is worn or scratched, will lead to the decline in print quality or destruction of the drum, badly worn, only scrapped. Scrapped due to wear and tear, scratches and drum in the actual work. Now a new type of long-life ceramic drum (a-Si) has been applied, you can print more than 300,000. Good temperature stability. The performance of the photoconductor easily affected by temperature, so in the performance of laser printers, with particular emphasis on the environment have the right temperature and humidity, otherwise it will affect print quality. The strike between dots of laser pointer will be formed.
Photoconductivity. Photoconductivity is an important indicator of the drum, it directly affects the print quality is good or bad. The drum work continuously in the charge and discharge cycle, the requirements of the charging potential rising fast, the surface saturation potential is higher than the application potential; Otherwise, the initial potential do not increase, will also affect print quality. Charging drum after dark decay should be small, otherwise maintain not to the surface potential, can not form the necessary potential difference between the latent image.