Zooming lens

Abstract

The disclosed zoom lens comprises: from object end to image end, the first lens group with positive focus, the second lens group with positive lens group, the third lens group with positive focus to move and share the compensation function with the fourth, and the fourth lens group with positive lens group. This invention has high scaling factor and pixel, reduces lens number and cost, and fit to different request.

Description

technical field [0001] The invention relates to a lens, in particular to a zoom lens applied to an image capturing device. Background technique [0002] With the progress of photosensitive element (CMOS / CCD) production technology, the image capture device is developed in the direction of high pixel and small size. Common image capture devices such as camera phone (Phone Camera), digital video camera (Digital Video Camera, DVC), Digital still cameras (Digital Still Camera, DSC) and digital single-lens reflex cameras (Digital Signal Lens Reflex, DSLR), etc., all meet the needs of consumers by increasing the number of pixels. [0003] As far as the current technical trend of image capture devices is concerned, in addition to the continuous shrinking of the unit size of the photosensitive element (CMOS / CCD) and the continuous increase of the sensitivity, the digital pixel size of the camera must also meet people's needs. When increasing the pixels, it is also necessary to incre...

AI Technical Summary

Problems solved by technology

[0009] However, the technique of moving the second, third, and fourth lens groups mentioned above is generally insufficient in zoom magnification, and there is a maximum aperture value (F no ) is too high or there are too many lenses, so the miniaturization problem of the zoom lens in the previous US patent still cannot be solved

At the same time, none of these U.S. patents can further improve the brightness, viewing angle and / or reduce the number of lenses while miniaturizing the lens, so they cannot reduce the cost, and cannot provide the required zoom lens according to the needs of different product levels.

[0010] Due to the shortcomings of the above-mentioned prior art, such as the inability to take into account the miniaturization of the product, maintaining the image quality of the lens, and high manufacturing costs, it cannot meet the demand for lenses for digital cameras / video cameras.

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