Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
1999-09-17
2001-08-21
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S677000, C359S683000
Reexamination Certificate
active
06278558
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a transverse zooming lens set, and especially to a zooming lens set in which the focus change is performed without adjusting the longitudinal (optical axis) direction distance between lenses in the lens set.
2. Description of the Prior Art
In current camera, telescope and other photo lens systems, a zooming lens set can be adjusted to make the object being imaged appear gradually bigger or smaller so that it seems to be getting steadily closer or more distant. In these devices, by longitudinal movement of the lenses along the optical axis, the focus is changed for making up the images in different sizes. Changing focus is to adjust the distance between lenses or lens sets by moving the lenses or lens sets along the optical axis. However, the traditional way of changing focus is very difficult and complicated. One primary reason is that the relation between the track of the lenses with respect to the focus is nonlinear. Thus, a very precise guiding track (cam) is necessary for adjusting the relative distance between the lens sets. There are optic problems as well as mechanical difficulty in manufacturing a complete lens set with variable focus.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide a zooming lens set with a fixed distance between lenses comprising at least one gradually changed curvature. Each of the lenses may include different gradually changed curvatures. Each curvature may have a gradient radius. In assembling, the gradually changed curvature lens or gradually changed curvature lens sets are installed within a system so that the lenses are retained within a fixed distance. Thereby, the gradually changed curvature lens on lenses may be adjusted to have a desired curvature by relative movement in the transverse direction to the optical axis or rotation in the vertical plane to the optical axis so that the focus of the system is changed.
REFERENCES:
patent: 3583790 (1971-06-01), Baker
patent: 4650292 (1987-03-01), Baker et al.
patent: 4925281 (1990-05-01), Baker
Epps Georgia
Thompson Tim
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