US 5,708,886 A · Camera

Abstract

A camera is applied to a compact camera or a VTR integrated with a simplified camera. A cam cylinder is used as lens driving mechanisms for a photographing optical system and a finder optical system. A moving lens frame and a connecting member provided with a cam dependent moving member are connected with an elastic member for forcing in a direction approaching each other, and then when an external force is added to the moving lens frame, the zoom lens system can be prevented from being damaged. A space near a focal surface is sealed up by a taking lens frame and a concave portion of a case, whereby the focal surface can be kept from collecting dust. Further, both end portions of a guide pole for guiding the taking lens frame so as to move back and forth in the case are press fitted into through holes formed at front and rear ends of the case and supported, whereby the guide pole can be assembled easily. Plural cylindric pins are formed at corner portions of a rectangular lens, and then the pins come in contact with flat portions formed at corner portions of an adjacent lens, so that plural lenses can be held in predetermined intervals without an interval ring. Further, a back focus can be adjusted from the front of the zoom lens system and the focus of image can be kept though the case expands or contracts because of a temperature change.

Claims13

Dependent claims

A camera comprises:

a photographing optical system for holding taking lens groups and provided with a taking lens frame which is movable back and forth along a photographing optical axis;
a finder optical system for holding finder lens groups and provided with a finder lens frame which is movable back and forth along a finder optical axis;
a connecting member provided with a cam follower;
a cam cylinder provided with cam grooves on a peripheral surface, into which respective cam followers projected from said connecting member and said finder lens frame are put;
and
an elastic member for connecting said taking lens frame and said connecting member by forcing in a direction approaching each other;
wherein said cam cylinder is rotated so as to move said taking lens frame back and forth through said elastic member and said connecting member and said finder lens frame back and forth along said cam grooves respectively, so that a photographing magnification and a finder magnification are changed and corresponded;
said cam cylinder being a side cam cylinder, which is parallel to said photographing optical axis of said photographing optical system and said finder optical axis of said finder optical system, and which is rotatably arranged around an axis that is different from said photographing axis and said finder optical axis.

5 more elements

Dependencies are inferred from the claim text.

Camera

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Camera

Life of this patent

Abstract

Claims13