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Zoom lens

A zoom lens and lens technology, applied in the field of zoom lenses, can solve problems such as inability to achieve clear and complex images, and achieve the effects of good optical imaging quality, simple structure, and high zoom ratio.

Inactive Publication Date: 2011-05-18
CORETRONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the traditional stage lights output the light from the light source through a simple lens to form a spot, or add a simple pattern on the light path and form an image with a simple pattern on the stage, but cannot achieve clear and complex image

Method used

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Examples

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Embodiment Construction

[0046] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.

[0047] Figure 1A It is a structural schematic diagram of a zoom lens in an embodiment of the present invention at the wide-end (wide-end), Figure 1B for Figure 1A The structural diagram of the zoom lens in the middle position (middle), and Figure 1C for Figure 1A Schematic diagram of the structure of the zoom lens at the tele-end. Please refer to Figure 1A to Figure 1C, the zoom lens 100 of this embodiment is suitable to be disposed between a zoom-in side and a zoom-out side, and is suit...

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Abstract

The invention discloses a zoom lens suitable to be arranged between a magnifying side and a narrowing side. The zoom lens comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and an aperture diaphragm, wherein the first lens group is arranged between the magnifying side and the narrowing side and has positive diopter; the second lens group is arranged between the first lens group and the narrowing side and has negative diopter; the third lens group is arranged between the second lens group and the narrowing side and has positive diopter; the fourth lens group is arranged between the third lens group and the narrowing side and has positive diopter; the fifth lens group is arranged between the fourth lens group and the narrowing side and has positive diopter; and the aperture diaphragm is arranged between the second lens group and the third lens group. The zoom lens meets that: f1 / TT is more than 0.3 and less than 0.7, wherein the f1 is an effective focal length of the first lens group; and the TT is the total length of the zoom lens. The zoom lens has a simple architecture and high zooming ratio.

Description

【Technical field】 [0001] The present invention relates to a lens, and in particular to a zoom lens. 【Background technique】 [0002] Existing zoom projection lenses usually achieve zooming by means of more than two groups of movable lens groups. However, generally speaking, the higher the zoom ratio, the larger the number of movable lens groups. In addition, there are very few lenses with a zoom ratio exceeding 2x, and these lenses add many aspherical surfaces to achieve resolution and shorten the overall length of the lens. As a result, not only the overall mechanism is quite complicated, but also the cost is greatly increased. This happens especially when zoom lenses are used on stage projectors, where higher zoom ratios are usually required. In addition, the traditional stage lights output the light from the light source through a simple lens to form a spot, or add a simple pattern on the light path and form an image with a simple pattern on the stage, but cannot achiev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/16
Inventor 廖陈成
Owner CORETRONIC
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