Zoom lens, imaging device, and personal digital assistant

Abstract

The invention provides a zoom lens capable of achieving a half angle of view over 38 degrees at the wide-angle end, a magnification ratio 6.5 to 10 or more, and a resolving power corresponding to an imaging element of 5 to 8 million pixels, with a configuration of as few as 10 to 11 pieces of lenses. The zoom lens of the invention includes a first lens group through a third lens group I to III of positive / negative / positive in order from the object side, or further includes a fourth lens group of positive IV. In the zoom lens, when changing magnification from a wide-angle end toward a telephoto end, a spacing between the first lens group and the second lens group increases and a spacing between the second lens group and the third lens group decreases.

Description

[0001] priority [0002] This application claims the priority of Japanese Patent Application No. 2006-172466 filed with Japan Patent Office on June 22, 2006 and Japanese Patent Application No. 2006-210240 filed with Japan Patent Office on August 1, 2006 , the contents of which are hereby incorporated by reference in their entirety. technical field [0003] The present invention relates to zoom lenses, imaging devices and personal digital assistants. Background technique [0004] With the widespread spread of imaging devices typified by digital cameras, there is a general tendency to seek further improvement in imaging quality and smaller-sized device bodies, and to pursue higher-quality and smaller-sized zoom lenses used as imaging lenses. [0005] For a smaller-sized zoom lens, first, it is necessary to shorten the total lens length used (the distance from the lens surface on the closest object side to the image plane), and to shorten the thickness of each lens group and c...

AI Technical Summary

Problems solved by technology

The zoom lens disclosed in Patent Document 3 has a half angle of view at the wide-angle end of approximately 37 degrees, which is sufficient to be considered a wide-angle, but as many as 14 lenses in total are required to obtain this effect, and there is obviously a downsizing (reducing total length when retracted) and room for cost reduction

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