Patent ID: 7649694
Filing Date: 2010-01-19
Classification: G02B

Abstract:
1. A zoom lens, suitable for imaging an object on a photosensitive device, comprising: a first lens group; a second lens group, located between the first lens group and the photosensitive device; a third lens group, located between the second lens group and the photosensitive device; and a fourth lens group, located between the third lens group and the photosensitive device, wherein the second lens group and the third lens group move between the first lens group and the fourth lens group, the first lens group, the second lens group, the third lens group and the fourth lens group comprise at least a glass lens and a plurality of plastic lenses, and the number of plastic lenses is greater than the number of glass lens, a distance between the first lens group and the photosensitive device is D and the field of view angle of the zoom lens is θ, and when the magnification of the zoom lens is switched to a wide-end configuration, 4<θ/D<5.