Production of CCD cameras to learn how to select materials
First talk about the photosensitive chip: the photosensitive chip is a camera "eye" which directly determines the quality of camera imaging, especially infrared camera at night the light of the circumstances, it is particularly important. Photosensitive chip is divided into two kinds of CCD and CMOS, both of which are basically using silicon photosensitive diodes for photoelectric conversion. But because of the difference between the two structures: CMOS has independent amplifier for each pixel; CCD uses a charge transfer mode to output the signal, and all pixels use the same amplifier to amplify the signal. At present, the market conventional CCD sensors are: SONY, 633639405409 and other mainstream sensors, SHARP has: 24212321, COMS's main: 10301089 sensors. Type of font to print in the sensor on the back, if you want to know the true and false apart only read the sensor.
DSP chip: if the photosensitive chip is the camera's eye, the DSP camera is the "brain", which not only control the CCD signal acquisition and spectrum analysis of signals, digital filtering, intelligent analysis. Therefore, the function of DSP directly affects the quality of images. But before the use of DSP on the camera, the general Sony, sharp bundled CCD sales, resulting in even if other companies have good DSP image processing technology, it is difficult in the field of security cameras to show their fists. The current mainstream DSP SONY 3142317221634140, SHARP DSP: 3860338627, South Korea's 20302040 is the mainstream, there are a lot of DSP, now Taiwan, South Korea, Haiwei and domestic DSP, some DSP type selection of the time.
Infrared LED light board: the infrared camera three commonly used wavelengths of infrared light, infrared 810nm, 850nm, 940nm. 810nm is generally used for laser infrared light board, the laser light angle, light concentration, so laser infrared lamp is generally used in night long distance monitoring. The traditional LED lamp slowly use fewer people, now a lot of infrared lamp array, we recommend you choose must choose Jingyuan, don't buy cheap goods for months to hang. It's important to match the angle with the lens.
Lens: HD infrared camera lens selection, in addition to HD, the first is to choose the infrared lens with IR function, if not by common sense infrared lens, the infrared and visible light at night during the day up, resulting in lens focal shift, daytime image clear night blurred; and in the condition of a certain focal length next, try to use small aperture F lens, the aperture is small, the greater the amount of light into the. Choose the lens is critical, first, to produce the actual strength of the factory, two to hand during the day, evening test, see if running coke, compatibility is OK, and some lenses after aging blurred, and had to prevent ah.
Camera case: high-definition infrared camera housing mainly has three functions: 1, fixed on the PCB 2. PCB; 3. LED for waterproof protection; heat dissipation; fixed PCB function there is no doubt that the waterproof performance of PCB is very important, now there are two kinds of design ideas, or shell all is in prison, a little water vapor can enter or leave, vent, to ensure that the camera internal and atmospheric well convection by evaporation of the camera internal moisture quickly dispersed. The shell is embossed burr, the hole position is smooth.
Summary: the selection of raw materials is good we have the responsibility to customers, the high price is not good, only to choose, do not choose expensive, the price competition is so fierce in the period we must do every thing.