At the end of the 18th century, human beings began to study electric light sources.
In the early 19th century, British H. David invented the carbon arc lamp.
In 1879, T.A. Edison of the United States invented the carbon filament incandescent lamp with practical value, which made human beings enter the era of electric lighting from the long fire lighting.
In 1907, drawn tungsten wire was selected as the incandescent body.
In 1912, I. Langmuir and others in the United States conducted research on gas-filled incandescent lamps, which improved the luminous power of incandescent lamps, extended their lifespan, and expanded the use of incandescent lamps.
In the early 1930s, low-pressure sodium lamps were successfully developed.
In 1938, Europe and the United States developed fluorescent lamps, whose luminous power and lifespan are more than three times those of incandescent lamps, which is a major breakthrough in electric light source technology.
In the 1940s, high-pressure mercury lamps entered a stage of practical use. In the late 1950s, halogen tungsten lamps with extremely small volume and light decay came out, which changed the sluggish development of thermal radiation light source technology, and was another major breakthrough in electric light source technology. In the 1960s, metal halide lamps and high-pressure sodium lamps were developed, and their luminous power is much higher than that of high-pressure mercury lamps.
In the 1980s, small-diameter compact energy-saving fluorescent lamps, low-power high-pressure sodium lamps, and low-power metal halide lamps appeared, which made electric light sources enter a new era of miniaturization, energy-saving and electronization.
1. Industry chain of machine vision
Machine vision is widely used in life and plays an important role in the fields of transportation, hydrological observation, and early warning and identification of geological disasters. From a microscopic point of view, the fastest-growing sub-industries are face recognition and image recognition.
These two branch occupations are more concentrated in the fields of finance, security, and transportation. Most of the investors in these sub-categories have their own technical advantages and will provide solutions for various scenarios to make a profit.
2. Current situation of Machine vision in China
The machine vision industry in China started relatively late, and the degree of concentration is not very high. In the beginning, companies in China mainly played as the agency of foreign brands. In recent years, many dealers began to develop products independently, but there was a certain distance from foreign companies in the fields of occupational distribution, channel distribution, and sophisticated automation.
The quality and technical content of relatively sophisticated automatic products of China's machine vision system are low, and the market is far from saturated.
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