Analyzing a four-component mechanically compensated zoom lens, it is discussed the first-order focus-shift during zooming process caused by production errors. The two-point and three-point compensations are studied.
It is derived the relation between input and output Gaussian beam parameters (beam waist size, spot size at reference plane, radius of curvature of wave-front and distance between reference plane and beam waist) in terms of Gaussian brackets.
The philosophy for human resources development in CANON Inc is based on the three-self spirit (Self-motivation, Self- awareness and Self-management). The Canon's R&D engineers are required a positive attitude, creativity and courage to research and to develop products of innovation. Educational measures in optics being in effect in Canon consist of the in-house training courses, studying abroad, publication and others.
Assuming that exit pupil position is fixed, it is presented a zoom lens having a focusing mechanism which does not give rise to any changes in the angular field of view. A frontal part set in front of the zooming part consists of two movable components for focusing. The paraxial condition in which no focus breathing phenomena exist is, in general, derived. Explicit expressions of component-displacement are obtained together with the relation to one-movable component focusing method. According to the analysis, a zoom lens is designed to show the usefulness of the analysis.
It is analyzed a mechanically compensated zoom lens in which the second and fourth components are movable to attain zooming effects, while the first, third and fifth components are fixed during zooming. It is derived a set of quartic and two (or four) elements simultaneous zoom equations each of which simultaneously satisfies two paraxial conditions; continuous change of magnification (or focal length) and constant object-image distance. Analytical solutions are obtained together with an approximate zoom equation in the vicinity of a critical point and that near a singular point. Numerical example is added to show the effectiveness of the analysis.
It is discussed zooming loci of movable components in several types of mechanically compensated zoom lenses. They are a fundamental type (a variable afocal converter), a basic two-component type and a standard four-component type. A simultaneous zoom equation for each type, which satisfies simultaneously two paraxial requirements for zooming, namely, variation of paraxial value and stationary distance between an object and its image is derived. A set of analytical solutions to each type is obtained together with a numerical example. More general discussion is also added.
This paper summarizes two subjects; one is theoretical development of zoom lenses and another is their configurational advances.In the former part, a general zoom equation is presented and its paraxial analysis is, in general, derived. In the latter part, it is enumerated and analyzed newly developed configurations of zoom lenses, such as a built-in range extender, an electronically compensated zoomlens, a two-component telephoto type and others.
The HRD philosophy in R&D in Canon is based on the three-self spirit (self-motivation, self-awareness and self-management). The Canon's R&D engineers are required a positive attitude, creativity and courage to research and to develop new products. Educational measures in optics being in effect in Canon consist of the in-house training courses, studying abroad, publication and others. Several matters which should be noted in education in optics are also discussed; for example, the relationship among geometrical, physical and quantum optics.
It is proposed a process to formally linearise a constrained nonlinear susematic lens design problem formulated by the penalty function method, together with solutions given by the QR transformation method.