Patent ID: 6493512
Filing Date: 2002-12-10
Classification: G03B

Abstract:
A step zoom lens camera comprising:a rotatable cam ring; a cam groove formed on the cam ring, said cam groove comprising a plurality of step areas, formed by splitting a focal length from the wide angle extremity to the telephoto extremity, and transit areas which connect said plurality of step areas to form a step zoom path; a linear movement member which is connected to the cam ring so as to rotate relative thereto and to move together in the optical axis direction; and a cam-guided lens group which is guided by the linear movement member to move linearly in the optical axis direction in accordance with the cam groove so as to move to an in-focus position of an object, from an infinite object distance to a closest object distance, within each step area of said cam groove; wherein said cam ring is provided on the rear end surface thereof with a plurality of step area indicating indexes which are spaced from one another in the circumferential direction to represent the corresponding step areas; and wherein said linear movement member is provided with a reference index at a predetermined circumferential position thereof, so that the position of use of the cam groove can be visually confirmed by viewing the position of the step area indicating indexes relative to the reference index.