The meniscus lens is a kind of lens with aspheric shape. Its materials include K9 glass, fused silica, zinc selenide, zinc sulfide, germanium, silicon, lithium fluoride, magnesium fluoride, calcium fluoride, barium fluoride and other optical materials. What is the centering coefficient of the meniscus lens? Let's take a look together!
The centering coefficient (also known as Z-coefficient) of a crescent lens is not a fixed value, but is calculated based on the specific design parameters of the lens. The centering coefficient is a parameter used to reflect the difficulty of lens centering, and its calculation formula involves the diameter (or aperture) and curvature radius of the front and rear surfaces of the lens.
The formula for calculating the centering coefficient of a crescent lens is: Z=(D1/R1)+(D2/R2)
Among them, D1 and D2 are the diameters (or apertures) of the front and rear surfaces of the lens, respectively, and R1 and R2 are the curvature radii of the corresponding surfaces. When both sides of the lens are concave or convex, the positive or negative sign is taken as the positive sign; When it is convex and concave, the positive and negative signs are taken as negative signs. Based on the value of the centering coefficient, the difficulty of centering the lens can be determined. Generally speaking, the smaller the Z value, the more difficult it is to center and process. The specific level of difficulty in centering is usually classified as: difficulty in centering when Z<0.05; When 0.05 ≤ Z<0.15, it is generally centered; When 0.15 ≤ Z, centering is easy. The centering coefficient of a lunar lens is related to its specific design parameters, so different lunar lenses may have different centering coefficients. In the design phase of optical systems, it is necessary to comprehensively consider the centering coefficient of the lens and other factors to ensure the performance and processing feasibility of the system.
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