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Zoom lens and camera device

A zoom lens and lens group technology, which is applied in image communication, television, optics, etc., can solve the problems of lens total length becoming longer, plastic lens, lens manufacturing error, etc., to achieve the suppression of manufacturing/assembly error and full aberration correction effect , good cost reduction effect

Inactive Publication Date: 2011-03-16
FUJI PHOTO OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] For example, the second lens group described in Patent Document 3 uses an aspheric lens having a negative refractive power on the most object side, but since the refractive power of this lens is large, it is difficult to form the lens from plastic.
[0011] In addition, plastics generally have a low refractive index, so there is a problem that the curvature of the lens becomes large, and the performance degradation due to the manufacturing error or assembly error of the lens becomes very large.
If the refractive power of the second lens group is reduced and the refractive power of each negative lens of the second lens group is reduced, it can also be made of plastic. There is a problem that the total length of the lens becomes longer when the amount of movement becomes larger
In addition, the diameter of the front lens (the diameter of the most object-side lens in the entire system) is also increased, which is contrary to miniaturization.

Method used

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  • Zoom lens and camera device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0131] Next, numerical examples of the zoom lens of the present invention will be described. The lens sectional view of the zoom lens of Example 1 is shown in figure 1 . Each lens sectional view of the zoom lens of Examples 2-9 is shown in Figure 2 to Figure 9 . Figure 2 to Figure 9 The graphical method and figure 1 same.

[0132] Table 1 shows the basic lens data of the zoom lens according to Example 1, Table 2 shows the data related to zooming (magnification), and Table 3 shows the aspheric surface data. Similarly, basic data, data related to zooming, and aspheric surface data of the zoom lenses according to Examples 2 to 9 are shown in Tables 4 to 27. Hereinafter, the meanings of the symbols in the tables will be described by taking Example 1 as an example, but the same applies to Examples 2 to 9 as well.

[0133] In the basic lens data in Table 1, Si represents the i-th (i=1, 2, 3, . number, Ri represents the radius of curvature of the i-th surface, and Di represe...

Embodiment 3

[0168] The zoom lens of Example 3 is greatly different from the zoom lens of Example 1 in that the first lens group G1 is composed of three elements including a negative lens L11, a positive lens L12, and a positive lens L13.

[0169] [Table 10]

[0170]

[0171] (*:Aspherical)

[0172] [Table 11]

[0173]

[0174] [Table 12]

[0175]

[0176] [Table 13]

[0177]

[0178] (*:Aspherical)

[0179] [Table 14]

[0180]

[0181] [Table 15]

[0182]

Embodiment 5

[0183] The zoom lens of Example 5 is greatly different from the zoom lens of Example 1 in that the first lens group G1 is composed of three elements including a negative lens L11, a positive lens L12, and a positive lens L13.

[0184] [Table 16]

[0185]

[0186] (*:Aspherical)

[0187] [Table 17]

[0188]

[0189] [Table 18]

[0190]

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PUM

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Abstract

The invention provides a zoom lens in small structure with good optical performance in low cost. The zoom lens comprises a first positive lens set (G1), a second negative lens set (G2) capable of moving to zoom, a diaphragm, a third positive lens set (G3), a fourth positive lens set (G4) for correcting and focusing the image surface position following with zooming, which are arranged in turn fromobject side. The second lens set (G2) at least comprises two negative lens. A plastic aspherical lens is arranged at the position most closed to the image side of the second lens set (G2). The focal length of the plastic aspherical lens is f2a and the focal length of the second lens set (G2) is f2 and the following conditions are satisfied: 2.4<absolute value of f2a / f2<10.0...(1).

Description

technical field [0001] The present invention relates to a zoom lens and an imaging device, and more particularly relates to a zoom lens suitably used for a video camera, an electronic still camera, a surveillance camera, and the like, and an imaging device including the zoom lens. Background technique [0002] In the past, four-group or five-group zoom lenses have been frequently proposed as zoom lenses for consumer video cameras, surveillance video cameras, and the like. Furthermore, a zoom lens using an aspheric lens has been proposed as a solution that can respond to these demands for miniaturization and high performance. Among the 4-group and 5-group zoom lenses in the above fields, there are many examples of using aspherical lenses as the positive lens of the third lens group. [0003] As another example, as described in Patent Documents 1 to 3, there is an example in which an aspheric lens is used for the second lens group of the magnification variable group in a quad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/16G02B1/04H04N5/225
Inventor 河村大树
Owner FUJI PHOTO OPTICAL CO LTD