Zoom lens, camera and portable information terminal device

Abstract

The present invention relates to a zoom lens, a camera and a portable information terminal device. Provided is a small-sized zoom lens consisting of about 10 lenses, wherein the lens has a half angle more than 38 degrees during wide angle, has a magnification more than 8 times, and has a resolution capable of dealing with a shooting component having 10 mega-pixel to 15 mega-pixel. The zoom lens is characterized in that: first to fourth group of lenses (G1- G4) respectively having a positive refractive power, a negative refractive power, a positive refractive power and a negative refractive power are arranged from an object side, a diaphragm (S) is arranged between the G2 and the G3, when zoom is performed from the wide angle to telescope, the lenses move to increase a space between the G1 and the G2, reduce a space between the G2 and the G3, and increase a space between the G3 and the G4, wherein the G1 and the G3 are closer to the object side during telescope than during the wide angle, a material of at least two positive lenses contained by the G1 satisfies the conditions as follows: 1.52 < nd < 1.65, 65.0 < vd < 75.0, 0.005 < Pg, F - (-0.001802vd + 0.6483) < 0.050.

Description

technical field [0001] The present invention relates to a zoom lens, a camera, and a portable information terminal device. [0002] The zoom lens of the present invention is suitable not only for photographic optical systems of digital cameras and video cameras, but also for photographic optical systems of silver halide cameras. Background technique [0003] In recent years, user requirements for digital cameras have been diversifying, among which high image quality and miniaturization require the use of zoom lenses as photographic lenses while achieving high performance and miniaturization. [0004] From the perspective of miniaturization, it is first required to shorten the overall length of the lens in use (the distance between the mirror surface on the subject side, that is, the distance between the mirror surface on the object side and the imaging image plane). The overall length becomes a very important topic. [0005] From the viewpoint of high performance, it is re...

AI Technical Summary

Problems solved by technology

[0012] Although the zoom lens disclosed in Patent Document 1 increases the half angle of view at wide-angle to 37°, the lens group is composed of 14 lenses in total. Therefore, the number of lenses, miniaturization (shortening the overall length when storing), cost, etc. There is still room for improvement

[0013] Although the lens group disclosed in Patent Document 2 achieves wide-angle and high zoom with a relatively simple structure, it still needs improvement in terms of miniaturization due to its long overall length when telephoto.

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