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Zoom lens

A zoom lens and lens technology, applied in the field of zoom lenses, can solve the problems of difficult to improve the overall pass rate, unfavorable yield pass rate, serious tolerance accumulation, etc., and achieve the effects of saving material cost, reducing tolerance accumulation, and improving production pass rate

Inactive Publication Date: 2007-10-10
YOUNG OPTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the zoom lens 100, since the lens group 130 is composed of one aspheric molded glass lens and two spherical lenses, it is difficult to improve the overall pass rate during mass production.
In addition, the aspherical molded glass lens is very important for correcting aberrations, but in the lens group 130, the aspheric molded glass lens is combined with two high-refractive-index spherical lenses, which will cause the accumulation of tolerances to be too serious, which is not conducive to the overall The qualification rate of the output will increase the production cost

Method used

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Embodiment Construction

[0035] 2A to 2C are structural schematic diagrams of the zoom lens according to an embodiment of the present invention at different zoom ratios, wherein FIG. 2A shows the structure of the zoom lens at the wide-end (wide-end), and FIG. 2B shows the zoom lens The structure when the lens is in the middle position (middle), and Fig. 2C shows the structure when the zoom lens is in the tele-end (tele-end). Please refer to FIG. 2A to FIG. 2C at the same time. The zoom lens 200 of this embodiment is suitable for imaging an object on a photosensitive element 50, wherein the photosensitive element 50 is, for example, a charge-coupled device or a complementary metal-oxide semiconductor (Complementary Metal-Oxide Semiconductor, CMOS ). The zoom lens 200 includes a first lens group 210 , a second lens group 220 , a third lens group 230 and a fourth lens group 240 . Wherein, the second lens group 220 is located between the first lens group 210 and the photosensitive element 50, the third l...

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Abstract

A 200m lens is prepared for setting the second lens group between the first lens group and photosensitive element as well as the third lens group between the second lens group and photosensitive element; moving the second lens group between the first and the third ones; forming third lens group by two lens with positive optical diopter; setting the fourth lens group between the third lens group and photosensitive element and in addition setting optical diopter of the first to the fourth lens groups in sequence to be positive, negative, positive and positive.

Description

technical field [0001] The invention relates to a zoom lens (Zoom Lens), in particular to a low-cost zoom lens. Background technique [0002] With the advancement of modern video technology, image devices such as digital video cameras (Digital Video Camera, DVC) and digital cameras (Digital Camera, DC) have been widely used. One of the core components in these image devices is a zoom lens, with the help of the optical zoom of the zoom lens, the image can be clearly focused on the Charge Coupled Device (CCD) for imaging, so the optical performance of the zoom lens and image imaging quality is closely related. In the fiercely competitive market, various manufacturers are all committed to improving the quality of the zoom lens and reducing its production cost, so as to enhance the competitive advantage of the imaging device. [0003] Please refer to FIG. 1 , which is a schematic structural diagram of an existing zoom lens. US Patent No. 5,583,697 discloses a zoom lens. As s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/177G02B15/16
Inventor 庄福明王国权
Owner YOUNG OPTICS
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