An optical lens is an optical element made of transparent material, such as K9 glass, crystal, etc., which affects the wavefront curvature of light. Optical lens is a kind of optical device that can converge or disperse light. The resulting image has both real and virtual images. Therefore, its application range is very wide, mainly in security, digital photography, laser industry, Optical instrument and other precision fields. These fields also have very large requirements for optics. Today, we will mainly look at one of the parameters. What is the flatness of K9 optical plano convex lens?
Optical lenses mainly include various ordinary colorless optical glasses made of fused silica, Calcium fluoride, Magnesium fluoride, silicon, germanium, Zinc selenide and other materials, as well as planoconvex lenses, biconvex lenses, planoconvex lenses, biconvex lenses, hemispherical lenses, spherical lenses, meniscus lenses, cylindrical mirrors, rod mirrors, glued lenses, etc., which are made according to the refraction law of light, also called refractors, Its refractive surface is a transparent body with two spherical surfaces or one spherical surface and one plane.
The flatness of K9 planoconvex lens is the plane deviation of the lens, which can be measured using an optical flat crystal, which is a high-quality and high-precision Plane of reference used to compare the smoothness of the lens. When the plane of the tested optical product is placed against the optical flat crystal, stripes will appear, indicating the surface smoothness of the tested optical product. If these stripes are equally spaced and parallel in straight lines, then the detected optical surface is at least as flat as the reference optical plane. If the stripe is curved, the number of stripes between two dashed lines (one tangent to the midpoint of the stripe, and the other passing through the endpoint of the same stripe) will indicate an error in smoothness. The deviation of smoothness is usually measured by the ripple value (lambda;), which is composed of multiple wavelength test sources. A stripe corresponds to 1/2 of the wavelength. Smoothness of 1 lambda;, Represents the general quality level; Smoothness of 1/4 lambda;, Represents the precise quality level; Smoothness of 1/20 lambda;, Represents a high-precision quality level.