Photosensitive drum is the core part of laser printer. Panel Receipt Printer is a photosensitive device, mainly made of optical materials. Its basic working principle is the process of "photoelectric conversion". Small Portable Receipt Printer is used as a consumer material in laser printers, and it is also relatively expensive. Photosensitive semiconductor has the common character of semiconductor, if be stimulated by heat, after doping, change electrical conductivity. In addition, it has a "photoconductive" property that no other semiconductor has. The conductivity of a photosensitive semiconductor can be increased by several orders of magnitude when exposed to light. In terms of energy bands, electrons in its valence band absorb the energy of light and jump into the conduction band, producing electron-hole pairs. This pair of electron-hole pairs produced by light is called "photo-borne carrier". As the number of "photo-generated carriers" in a photosensitive semiconductor increases, its electrical conductivity increases. This improved conductivity after exposure to light is called "intrinsic photoconductivity". In practice, the photosensitive semiconductor material needs to be doped before it can be made into the semiconductor material used in laser. Therefore, in addition to the intrinsic photoconductivity, Portable Printer Supplier is also necessary to have the properties of the impurity photoconductivity formed by electrons or holes on the photoexcited impurity level. In some photosensitive semiconductors, "impurity photoconductivity" plays a major role.

The "carrier mobility" (Portable Printer China) in an object can be changed to different degrees after being irradiated by light. The "conductance" that marks an object's ability to conduct electricity is equal to carrier density times mobility. Mobility is increased, conductivity is improved, and conductivity is determined by the values of intrinsic photoconductivity, impurity photoconductivity and mobility, but under certain conditions, some of the factors are the main factors.

All kinds of optical conductors used in practice have different sensitivity to light. The conductivity of a photoconductor is directly proportional to its sensitivity to light. So the optical inductance of a photoconductor is very important. Light conductors have different sensitivity to light. A light conductor that is sensitive to only the light of a particular region of the spectrum may lose its light sensitivity if it leaves that region.

A photosensitive semiconductor forms an absorption peak for light in the range of light wavelengths suitable for it. Photoconductivity is best in this peak range. It also has to do with illumination. The higher the illumination, the more carriers produced, the higher the photoconductivity. However, each optical conductor has different characteristics, so the illumination required to achieve the same photoconductivity index under the same conditions is different.

The common photoconductive materials used for photosensitive drum are cadmium sulfide (CdS) and Se-As. Organic photoconductive material (opc), etc.