CCD is currently the most commonly used image sensor for machine vision inspection systems manufacturers. It integrates photoelectric conversion and charge storage, charge transfer, and signal reading. It is a typical solid-state imaging device. The prominent feature of CCDs is the use of charge as a signal, unlike other devices that use current or voltage as a signal. Such an imaging device forms a charge packet by photoelectric conversion, and then transfers and amplifies the output image signal under the action of a driving pulse. A typical CCD camera consists of an optical lens, timing and sync signal generator, vertical driver, and analog/digital signal processing circuitry. As a functional device, CCD has the advantages of no burn, no hysteresis, low voltage operation and low power consumption compared with vacuum tubes.
Industrial lenses are important imaging components in machine vision systems. If the system wants to fully perform its functions, industrial lenses must be able to meet the requirements.
The telecentric lens selected when detecting the bottle mouth can correct the parallax of the traditional industrial lens, and it can make the image magnification not change within a certain object distance range. The situation that is not on the same surface is a very important application. Due to its unique parallel light path design, the telecentric lens is ideal for high precision machine vision applications.
Fig. 3-1 Comparison of lens shooting effects
3) Light source
Specially customized according to requirements to ensure the best image. The top ring light source provides different angles of illumination, which can highlight the three-dimensional information of the object and effectively solve the diagonal illumination problem. The surrounding surface adopts knurling design to expand the heat dissipation area to ensure the service life of the light source. Different diffusing plates are available depending on the PET preform specifications.
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