YDIT enthusiastically share the principle and composition of analog cameras

Source:YDIT 誉德 Release time:2019/9/20 9:01:00 Views:1483

 

The analog camera (paperless office system, ultra-thin integrated lifter, paperless conference system) is a device that converts the scene light into an electrical signal. The structure can be roughly divided into three parts: an optical system (mainly referred to as a lens), a photoelectric conversion system (mainly referred to as a camera tube or a solid-state imaging device), and a circuit system (mainly referred to as a video processing circuit). The analog camera is an important video signal source device for the film and television center and the program production department. Its function is to turn the external optical scene into a film and television signal that meets the needs.

The color image acquisition includes two processes. First, a color image is decomposed into red, green and blue primary color images by using a spectroscopic system, and then the three primary color images are respectively converted into corresponding three primary color electrical signals by using photoelectric conversion devices and scanning. .
(1) The composition of the analog camera
Although the analog cameras have a wide variety of appearances and different appearances, their basic components and working principles are roughly the same. From the mechanical structure, the lens, the viewfinder and the fuselage are the three main units that make up the analog camera. In addition, portable analog cameras also need to be equipped with accessories such as microphones, batteries, backpack video recorder connection cables; studio landlines are usually equipped with camera remote control (CCU), landline bracket, long-distance multi-core cable or fiber optic cable, zoom and adjustment Auxiliary equipment and devices such as telephoto lever and intercom headset. The lens portion is composed of 20 to 30 convex lenses of different curvatures and a plurality of servo motors. Its basic function is to image the optical image of the external scene and then project it onto the photosensitive surface of the imaging device. At present, most of the cameras use a zoom lens. In addition to changing the size of the aperture and the distance of the focus, the lens can easily adjust the length of the lens continuously. The lens portion of the camera is also referred to as the external optical system. The viewfinder, also known as the viewfinder, is an indispensable part of the camera's framing, composition and focusing. Its function is similar to that of the camera's viewfinder, except that the camera's viewfinder is pure optics, while the viewfinder is a small monitor. (4~7 inches). In addition, the viewfinder can also be used to check the camera's working status and image quality for proper adjustment and operation. The standard configuration of the camcorder's viewfinder display is 4 inches, and the viewfinder used in the studio camera is larger, usually 5 inches, 7 inches, and so on.
The fuselage is the main part of the camera. The inside of the fuselage includes a light splitting system (also known as an internal optical system), a photoelectric conversion device, a video processing amplifier, a sync signal generator, an encoder, and various automatic adjustment and control circuits. Figure 1-29 shows the basic structure of a typical three-chip CCD camera. The basic working process of the three cameras is that the light image of the subject enters the spectroscopic system through the zoom lens, where it is decomposed into three primary colors of red, green and blue, and imaged on the photosensitive surfaces of the three imaging devices. . The three imaging devices simultaneously perform photoelectric conversion, respectively outputting corresponding red, green, and blue primary color electrical signals, which are amplified and processed and sent to the encoder, and finally output a color full television signal from the encoder. (Paperless office system, ultra-thin integrated lifter, paperless conference system)
(2) The working principle of the analog camera
The optical system is equivalent to the eye of the camera, and the photoelectric conversion system is the core of the camera. The photoelectric conversion process is also the imaging process. After the camera system converts the optical image of the subject into a corresponding electrical signal, a recorded signal source is formed.
The working principle of the color camera is to use a spectroscopic system to decompose a color image into three primary color images of red, green and blue, and then convert the three primary color images into corresponding three primary color electrical signals by means of photoelectric conversion devices such as CCD, and then pass the video. Processing amplifiers, encoders, automatic control systems, sync signal generators, etc. (Paperless office system, ultra-thin integrated lifter, paperless conference system)