Ultraminiature zoom lens

Abstract

A zoom lens of subminiature type is prepared as setting the first negative diopter lens set formed by a negative lens and a positive lens as well as the second positive diopter lens set formed by a glued group and a negative lens in sequence from object space to image space, setting position of said first lens set to imaging surface to be fixed and moving said second lens set to vary distance to the first one for realizing verifocus function.

Description

technical field [0001] The invention relates to a zoom lens system, in particular to an ultra-small zoom lens with high zoom ratio composed of two lens groups. Background technique [0002] Most of the zoom lenses currently used in camera phones and digital cameras use three lens groups. For example, the "zoom lens" with Chinese Patent No. 200410078895.7 is a zoom lens with negative, negative and positive lens groups. The first lens group The position is fixed, changing the distance between the second lens group and the first lens group changes the focal length of the entire lens, and the change of the position of the third lens group compensates for the movement of the imaging surface after zooming, so that the position of the imaging surface remains fixed all the time No change, although the zoom lens of the three lens groups can meet the needs of shooting far and near angles of view, and the optical zoom can reach nearly 2 times, but as a small, especially an ultra-small ...

AI Technical Summary

Problems solved by technology

[0002] Most of the zoom lenses currently used in camera phones and digital cameras use three lens groups. For example, the "zoom lens" with Chinese Patent No. 200410078895.7 is a zoom lens with negative, negative and positive lens groups. The first lens group The position is fixed, changing the distance between the second lens group and the first lens group changes the focal length of the entire lens, and the change of the position of the third lens group compensates for the movement of the imaging surface after zooming, so that the position of the imaging surface remains fixed all the time No change, although the zoom lens of the three lens groups can meet the needs of shooting far and near angles of view, and the optical zoom can reach nearly 2 times, but as a small, especially an ultra-small mobile phone or digital camera, the volume is still relatively large. The movement of the second and third lens groups requires two micro motors to drive together, which not only increases the production cost, but also wastes more battery power; for this reason, the industry has also designed a second lens driven by only one motor. Group lens groups, one lens group is fixed, and the other lens group is driven by a motor to zoom, such as the "zoom lens" of the disclosed Chinese Patent No. 95115883. However, there are still many defects exposed in the actual use process. For example, when the general shooting state is switched to the far-angle or close-angle shooting state, or when the far-angle is changed to the close-angle, the total length of the entire lens will change with the shooting state. This kind of zoom lens whose overall length will change is not suitable for ordinary mobile phones. First, it is difficult to fit into the components of the mobile phone. Second, it is easy to wear the lens of the mobile phone, and the zoom lens The two lens groups require more lenses, which virtually increases the weight of the mobile phone

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