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Camera Module, also known as Camera Compact Module, abbreviated as CCM, contains four major components: lens, sensor, FPC, and DSP. The important parts to decide a camera is good or bad are: lens, DSP, and sensor.The key technologies of CCM are: optical design technology, aspherical mirror production technology, optical coating technology.
Lens is a device that can receive light signals and converge light signals in the sensor CMOS/CCD. lens determines the light harvesting rate of the sensor, its overall effect relative to a convex lens. Optical lens structure is: lens barrel (Barrel), lens group (P / G), lens protection layer (gasket), filter, lens holder (Holder).
Camera module lens is divided into plastic lens (PLASTIC) and glass lens (GLASS), the general camera lens consists of several lenses, usually the lens for camera module is: 1P, 2P, 3P, 1G1P, 1G2P, 2G2P, 4G, etc.. The more the number of lenses, the higher the cost; in general, the glass lens will have better imaging effect compared with the plastic lens. However, the glass lens will be more expensive than the plastic lens.
There are various wavelengths of light in nature, the human eye to identify the wavelength range of light between 320nm-760nm, more than 320nm-760nm light the human eye can not see; and the camera imaging components CCD or CMOS can see most of the wavelengths of light. Due to the involvement of a variety of light, the color restored by the camera and the naked eye in the color deviation. Such as green plants become gray, red pictures become light red, black becomes purple, etc.. At night due to the filtering effect of the bimodal filter, so that the CCD can not take full advantage of all the light, not to produce snow noise phenomenon and its low-light performance is difficult to be satisfactory. To solve this problem, the use of IR-CUT double filter.
IR-CUT dual filter is a set of filters built into the camera lens set, when the lens outside the infrared sensor point to detect changes in the intensity of light, the built-in IR-CUT automatic switching filter can be based on the strength of external light and then automatically switch, so that the image to achieve the best results. In other words, the dual filters can automatically switch filters in daytime or nighttime, so that the best imaging effect can be obtained whether in daytime or nighttime.
camera moodule - VCM
Full name Voice Coil Montor, electronics inside the voice coil motor, is a kind of motor. Because the principle is similar to the speaker, so called voice coil motor, with high frequency response, high precision characteristics. Its main principle is in a permanent magnetic field, by changing the size of the DC current in the motor coil to control the stretching position of the spring, so as to drive the up and down movement. Camera compact module widely use VCM to realize the autofocus function, and the position of the lens can be adjusted by VCM to present clear images.
Image sensor is a semiconductor chip, its surface has millions to tens of millions of photodiodes, photodiodes by the light will generate an electric charge, the light will be converted into electrical signals. Its function is similar to the human eye, so the performance of sensor will directly affect the performance of camera.
Digital Signal Processor (DSP) is a microprocessor especially suitable for digital signal processing operations, and its main application is the real-time and rapid implementation of various digital signal processing algorithms.
Function: The main purpose is to optimize the digital image signal parameters through a series of complex mathematical algorithms, and to transmit the processed signal to cell phones, computers and other devices via USB and other interfaces.
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