BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be described below in detail with reference to the accompanying drawings in which:
FIG. 1 is a longitudinal sectional view of a retractable zoom lens of a digital camera according to the present invention, wherein an upper half portion and a lower half portion of the zoom lens from a photographing optical axis thereof show ready-to-photograph states of the zoom lens set at the wide-angle extremity and the telephoto extremity, respectively;
FIG. 2 is a longitudinal sectional view of the zoom lens shown in FIG. 1 in the fully retracted state thereof;
FIG. 3 is a longitudinal sectional view of the optical elements and associated elements thereof shown in FIG. 1, showing the relative positions of the optical elements in two ready-to-photograph states of the zoom lens;
FIG. 4 is a longitudinal sectional view of the optical elements and associated elements thereof shown in FIG. 2, showing the relative positions of the optical elements in the fully retracted state of the zoom lens;
FIG. 5 is a longitudinal sectional view of the second lens group, the third lens group, the second lens group support ring and the third lens group support ring showing the relative positions thereof in a state immediately before the second lens group and the third lens group are rotated to be retracted to the radially retracted positions thereof in between a ready-to-photograph state and the fully retracted state of the zoom lens;
FIG. 6 is a longitudinal sectional view of the second lens group and the third lens group, showing the relative positions thereof, in a state where the second lens group and the third lens group are being rotated so as to be retracted to the respective radially retracted positions thereof in between a ready-to-photograph state and the fully retracted state of the zoom lens;
FIG. 7 is a longitudinal sectional view of the second lens group and the third lens group showing the relative positions thereof, in a state where the second lens group and the third lens group are further moved rearward in the optical axis direction from the positions shown in FIG. 6 and have been retracted to respective radially retracted positions thereof (zoom lens not yet fully retracted);
FIG. 8 is a longitudinal sectional view of the second lens group, the third lens group, the second lens group support ring and the third lens group support ring showing the relative positions thereof in the fully retracted state of the zoom lens;
FIG. 9 is an exploded perspective view of the second lens group frame, the second lens group support ring, the third lens group frame and the third lens group support ring in a state where the second lens group frame and the third lens group frame are held in the respective photographing positions thereof;
FIG. 10 is a view similar to that of FIG. 9, showing the second lens group frame, the second lens group support ring, the third lens group frame and the third lens group support ring in a state where the second lens group frame and the third lens group frame are held in the respective radially retracted positions thereof;
FIG. 11 is an exploded perspective view of the second lens group frame, the second lens group support ring, the third lens group frame and the third lens group support ring in a state where the second lens group frame and the third lens group frame are held in the respective photographing positions thereof, viewed from an angle different from the angle shown in FIG. 9;
FIG. 12 is an exploded perspective view of the second lens group frame, the second lens group support ring, the third lens group frame and the third lens group support ring in a state where the second lens group frame and the third lens group frame are held in the respective photographing positions thereof, viewed from an angle different from the angle shown in FIG. 10;
FIG. 13 is an exploded perspective view of the second lens group frame and the third lens group support ring, showing the shape of the retracting cam formed on the third lens group support ring;
FIG. 14 is an exploded perspective view of the third lens group frame and the second lens group support ring, showing the shape of the retracting cam formed on the second lens group support ring;
FIG. 15 is a front elevational view of the second lens group frame, the third lens group frame and other elements, showing the relative positions of the second lens group frame and the third lens group frame in a ready-to-photograph state of the zoom lens;
FIG. 16 is a view similar to that of FIG. 15, showing the relative positions of the second lens group frame and the third lens group frame in the fully retracted state of the zoom lens;
FIG. 17 is a front elevational view of the third lens group support ring and the second lens group frame, showing the relative positions thereof in a ready-to-photograph state of the zoom lens, viewed from the front in an optical axis direction;
FIG. 18 is a view similar to that of FIG. 17, showing the relative positions of the third lens group support ring and the second lens group frame in the fully retracted state of the zoom lens, viewed from the front in the optical axis direction;
FIG. 19 is a front elevational view of the second lens group support ring and the third lens group frame in a ready-to-photograph state of the zoom lens, showing the relative positions of the second lens group support ring and the third lens group frame, viewed from the rear in the optical axis direction;
FIG. 20 is a view similar to that of FIG. 19, showing the relative positions of the second lens group support ring and the third lens group frame in the fully retracted state of the zoom lens, viewed from the rear in the optical axis direction;
FIG. 21 is a perspective view of the second lens group frame and the third lens group frame in which two position-control cam projections are integrally formed, respectively, of another embodiment of the retracting device of the zoom lens; and
FIG. 22 is a perspective view of the second lens group frame and the third lens group frame which are shown in FIG. 21 and illustrates a state where the second lens group frame and the third lens group frame have been rotated to the respective radially retracted positions thereof by control of the position-control cam projections.