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Zoom lens

A zoom lens and lens group technology, applied in the zoom lens field, can solve the problem that the zoom lens cannot take into account miniaturization and high zoom magnification, and achieve the effects of reduced volume, high magnification, and high optical efficiency

Active Publication Date: 2015-01-28
ASIA OPTICAL CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a zoom lens that can not only effectively achieve the purpose of miniaturization but also have a high zoom ratio in view of the defect that zoom lenses in the prior art cannot take into account both miniaturization and high zoom ratio with high optical efficiency

Method used

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Experimental program
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Embodiment Construction

[0046] In order to illustrate the present invention more clearly, preferred embodiments are given and described in detail with accompanying drawings as follows.

[0047] see figure 1 , is the lens configuration diagram of the zoom lens 1 according to the first preferred embodiment of the present invention. The zoom lens 1 includes a first mirror group G1, a second mirror group G2, a diaphragm ST, a third mirror group G3, a fourth mirror group G4, a fifth Lens group G5 and imaging surface IMA. In addition, according to the needs of use, a cover glass CG (Cover Glass), which is flat glass, can be further provided between the fifth mirror group G5 and the imaging surface IMA. in:

[0048] The first lens group G1 has positive refractive power and includes a first lens L1 , a second lens L2 and a third lens L3 arranged in sequence from the object side to the image side. The first lens L1 is a crescent lens with negative refractive power, and its convex surface S1 is facing the ...

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Abstract

The invention relates to a zoom lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and an imaging face sequentially arranged along the optical axis from an object side to an image side. The first lens group has positive refractive power and comprises three lenses, wherein two of the lenses have positive refractive power. The second lens group has negative refractive power and comprises four lenses. The third lens group has positive refractive power and comprises two lenses, wherein one of the lenses has positive refractive power. The fourth lens group has positive refractive power and comprises five lenses, wherein three of the lenses have positive refractive power. The fifth lens group has positive refractive power and comprises two lenses, wherein one of the lenses has positive refractive power. The purposes of miniaturization and high multiplying power are realized by the above configuration.

Description

technical field [0001] The present invention relates to a lens, and more specifically refers to a zoom lens. Background technique [0002] In recent years, with the advancement of technology, imaging devices such as cameras, video cameras, microscopes or scanners have gradually become smaller and lighter in order to facilitate people's portability and use. Therefore, it is greatly reduced. In addition, in addition to miniaturization and light weight, it is also necessary to have higher optical performance in order to achieve high zoom ratio, high resolution and high contrast images. Therefore, miniaturization and high optical performance are two indispensable elements for the development of today's zoom lenses. However, in order to achieve high zoom magnification and high optical performance, the zoom lenses currently used in imaging devices are nothing more than using multiple sets of lens groups, and even some lenses have more than 20 lenses in total, which cannot effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/173G02B3/02
Inventor 张裕民
Owner ASIA OPTICAL CO INC