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In this paper, a method of constructing smooth surface based on quadrilateral mesh by using C-curves is presented. Instead of using the conventional basis {t3, t2, t, 1}, C-curves are developed by using the basis {sint, cost, t, 1}. Compared with the traditional cubic curves, C-curves can represent transcendental curves exactly such as the helix and the(More)
A systematic approach for the aberration design of a zoom lens system using a thick lens module is presented. Each component is treated as a thick lens module at the beginning of the design. A thick lens module refers to a thick lens component with a real lens structure, like lens materials, lens curvatures, lens thicknesses, and lens interval distances.(More)
A systematic approach for the aberration design of a four-component double-sided telecentric zoom lens system is presented. The Gaussian structure of the zoom system is specified previously which means the powers and movements of components are known. Each component is treated as a lens module during the design stage with specified first-order properties(More)
A general method for the calculation of paraxial design parameters of a double-sided telecentric zoom lens system with three components is given. Formulas that define the interval distances between components while zooming, the extremum of magnification, and the magnification of each component are derived. The kinetic property of the zoom system is also(More)
A method of constructing piecewise G/sup 1/ continuous spline surface using boundary C-curves is presented. C-curves are developed by the basis (sin t, cos t, t, 1), and it overcomes some shortcomings of the nonuniform rational B-splines (NURBS) model. How to develop C-curve into surface becomes a very important problem. Using the convex combination method(More)
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