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Camera Device
- Apr 03, 2018 -

A device that performs image decomposition and photoelectric signal conversion. Image decomposition is the process of decomposing a complete image into a number of individual pixels (the smallest unit of a television image). In general, the greater the number of pixels, the clearer the image. Each pixel is represented by a single color and brightness. The imaging device can convert the optical signal of each pixel in the image into a corresponding electrical signal and transmit it to the output in a certain order. The camera device is divided into two major categories of camera tubes and solid (semiconductor) imaging devices.

A camera tube, electron beam device, and is divided into the resolution tube, photomultiplier imaging tube, super positive imaging tube and light guide camera tube and so on. The new camera uses a small lead oxide photoelectric camera. Each camera tube has a vacuum bulb with a target surface and an electron gun. The imaged object is imaged on the target surface through the window on the glass bulb, and the illuminance distribution at each point of the target surface is converted into a corresponding potential distribution by using the photoemission effect or photoconductive effect of the target surface, and the light image is converted into an electric image. Under the driving of the deflection coil outside the tube, the electron beam scans the target surface line by line, and the potential signals of the pixels on the scanning path are sequentially output.

2 solid-state imaging devices, a new type of charge coupled device (CCD). Hundreds of thousands of device units are arranged in a plane, and the surface layer has photosensitivity characteristics. The imaged scene is imaged on the front, and the amount of charge stored by each unit is proportional to the illuminance. By using the clock pulse and the shift control signal, the signals of each unit of the array are shifted out in a certain order, and an image electric signal whose intensity changes with time can be obtained.

The preamplifier amplifies the weak signal output from the camera device to a video amplifier of a specified amplitude. To ensure a good signal-to-noise ratio, the preamplifier is required to have as small a noise figure as possible.