Abstract
Optical freeform surface components have attracted much attention due to their high degree of design freedom and small size. However, the design and processing difficulty of such components limit its wide application in optics industry. In recent years, diamond turning has been considered an efficient method for processing optical freeform surfaces, but the research on tool path generation of this processing method is not systematic. Progressive addition lens (PAL) is a typical optical freeform surface and is widely used to correct people’s vision problems. Firstly, this paper introduces a method of designing PAL. Then, an optimized tool path generation method for diamond turning of the optical freeform surface is proposed, the equal angle method is used to select the discrete points, and a tool nose radius compensation method suitable for both slow slide servo (SSS) and fast tool servo (FTS) is adopted. Finally, the turning experiment is carried out with a single point diamond lathe, and a PAL surface with a roughness of 0.087 μm was obtained. The power and astigmatism distributions were measured using a Rotlex freeform verifier to verify the rationality of the optical design.
Highlights
An optical freeform surface is defined as any nonrotationally symmetric surface or a symmetrical surface that rotates around an asymmetrical axis [1]
As early as 1983, Douglas of the University of Tennessee in the United States used an fast tool servo (FTS) device based on air-floating guides and linear motors to machine off-axis parabolic mirrors [14], which made FTS technology truly used in optical freeform surface machining
Conclusions is paper presents a Progressive addition lens (PAL) design method based on mathematical principles, which is different from the freeform surface model formed by spline interpolation to obtain more accurate calculation data
Summary
An optical freeform surface is defined as any nonrotationally symmetric surface or a symmetrical surface that rotates around an asymmetrical axis [1]. Such surfaces can be designed in any shape, and in most cases, these surfaces have submicron profile accuracy and nanoscale surface quality [2]. Ese components have a large number of requirements in the aerospace, biomedical, and scientific industries. It has a lot of daily applications, such as automotive lighting systems, F-theta lenses in laser printers, and mobile phone cameras [3, 4]. As early as 1983, Douglas of the University of Tennessee in the United States used an FTS device based on air-floating guides and linear motors to machine off-axis parabolic mirrors [14], which made FTS technology truly used in optical freeform surface machining
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