I. Deeply understand the importance of accelerating the scientific and technological progress of the non-ferrous metal industry Scientific and technological progress has always been a powerful driving force for the development of China's non-ferrous metal industry. First of all, we must profoundly understand the new trends in the development of science and technology in the world. The world economy has just experienced the worst financial crisis in nearly a century. Historical experience shows that financial crises are often the catalyst for the new technological revolution and the industrial revolution. Since the crisis, developed countries have started a new round of competition to seize the commanding heights of science and technology and industrial development. In the past two centuries, mankind has created more wealth than the sum of the past few thousand years. However, it is precisely because of this rapid development that the contradiction between energy, resources, environment and space has become increasingly acute. The future scientific and technological revolution bears the mission of finding new energy, new materials and new environment. It must not only support human development, but also achieve environmental protection, green, intensive and sustainable development. The process of the three industrial revolutions is also the process of expanding the use of metal materials. The first industrial revolution was mainly the use of steel, the second industrial revolution expanded the use of copper and aluminum, and the third industrial revolution expanded the use of semiconductor materials, electroplating materials, and rare metals. However, in a large family such as non-ferrous metals, the use of most metals has yet to be further developed. With the depletion of existing metal resources, the advancement of mining technology, and the development of materials science, the pace of replacing new basic materials with traditional functional materials will be further accelerated, which will further enhance the importance and superiority of existing color metals. Non-ferrous metals are the supporting materials for the development of high technology, and the industrial correlation is as high as 90%. Since the new century, material science, information technology, materials science and technology, life sciences, ecological science and technology, ocean and space science and technology have all produced exciting and major breakthroughs, which will open up a wide space for the application of non-ferrous metals. In the foreseeable future, the non-ferrous metals industry will be closely related to the global industrial revolution. Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
Meniscus Lenses: The Positive Meniscus can increase the NA of the system while only adding slightly to the total spherical aberrations. The Negative Meniscus Lens is used to increase the focal length of another lens while maintaining the angular resolution of the optical assembly. This lens shape is best used when one conjugate is relatively far from the lens. The meniscus lens plays a divergent role in the optical path, and is commonly used in photographic system, objective lens system and laser measuring system.
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Specification of our optical meniscus spherical lens as follow:
*Material BK7,CaF2 crystal,MgF2,Ge,BaF2 lens,ZnSe or other optical materials
*Dimension Tolerance +0.0 - -0.1mm
*Center Thickness +/-0.1mm
*Focal Length Tolerance+/-1%
*Surface Quality:60/40
*Surface Figure:lambda/2 at 633nm on plano side
*Clear Aperture >90%
*Chamfer 0.25mm at 45 degree typical
*Coating Optional
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