Surface Characteristics of Aspheric Lenses .pdf
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Aspheric lenses are becoming more and more important in some highprecision optical systems. And, like other optical lenses, the
surface must meet the same quality standards in terms of surface
shape accuracy and surface roughness. In this paper, are aspheric
less studied deeply from the theory of surface characteristics, the
calculation method of surface features of aspheric lenses, aspheric
lenses surface characteristics, and calculation formula are given,
and the characteristics of surface fitting error of aspheric lenses
are analyzed. Taking K9 glass aspheric optical lens, for example, the
surface characteristic function is discussed in detail. The results
show that the surface characteristic function of aspheric lenses has
higher precision, and its fitting error is better than + 30nm
Keyword: aspheric surface, surface characteristic, fitting
As an important optical element, aspheric lenses occupies an
important position in the optical system. Aspheric lenses function
in 3-4 times than spherical lenses in the optical system. Mainly
because of spherical aberration of aspherical lenses in the optical
system, such as lateral deviation, axis deviation and angle
deviation, which limits the application of spherical lens in the
optical system. The aspheric lens has the ability to eliminate
spherical aberration, thus greatly improving the sphere of use of
aspheric lenses in the optical system.
The research of aspheric lenses is mainly in two aspects. 1 using the
optical design software (such as CODE V and ZEMAX) design of aspheric
lenses, so as to solve the problem of light propagation and imaging
in the aspheric lens; the research mainly focuses on the production
process of an aspheric surface.
In foreign countries, the surface fitting of the aspheric surface has
been studied deeply, and the fitting method of the aspheric surface
is less. Hector proposed a curve algorithm suitable for conic
aspheric; based on linear least squares method, ZHANG proposed
aspheric parameters calculation algorithm; By changing the conic
constant values of K and using the max-min value of the least squares
method, G ugsa gets the surface contour standard. The above method
considers only the surface of a single standard surface. When
measuring the aspheric surface in the day, the estimation of the cone
constant K will be biased due to the different coefficients of the
polynomial. In this paper, the surface characteristic function of the
aspheric surface is established by theoretical analysis. The surface
characteristic function of the aspheric surface is discussed by
taking K9 glass as an example, and the fitting error is analyzed.