Zoom lens, lens unit and camera

A zoom lens and lens technology, applied in optical elements, instruments, optics, etc., can solve the problems of not being able to achieve wide-angle focal length, not being able to meet wide-angle focal length and brightness at the same time, and large F-number at the wide-angle end. Ensure the relative aperture, the effect of good correction of various aberrations

Inactive Publication Date: 2015-06-10
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the zoom lens described in Patent Document 1 has a relatively simple four-group structure, but there is a problem that it cannot achieve a wider angle of focal length.
In addition, the zoom lens described in Patent Document 2 has a five-group structure and can achieve a wide-angle focal length, but has the problem of a large (dark) F-number at the wide-angle end, and cannot satisfy wide-angle focal length and brightness at the same time.

Method used

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  • Zoom lens, lens unit and camera
  • Zoom lens, lens unit and camera
  • Zoom lens, lens unit and camera

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] Table 1 shows the lens data of the zoom lens of Example 1. in addition, image 3 (a) represents the sectional view of the wide-angle end of the zoom lens of embodiment 1, image 3 (b) shows a sectional view of the middle of the zoom lens of Example 1, image 3 (c) is a sectional view showing the telephoto end of the zoom lens of Example 1. FIG. and, Figure 4 (a) an aberration diagram showing spherical aberration, astigmatism, and distortion at the wide-angle end of the zoom lens of Example 1, Figure 4 (b) an aberration diagram showing intermediate spherical aberration, astigmatism, and distortion of the zoom lens of Example 1, Figure 4 (c) An aberration diagram showing spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens of Example 1. FIG. In addition, in the following aberration diagrams, in the spherical aberration diagram, the solid line indicates the d-line, and the dotted line indicates the g-line, and in the astigmatism d...

Embodiment 2

[0148] The lens data of the zoom lens of Example 2 are shown in Table 2. in addition, Figure 5 (a) shows a sectional view of the wide-angle end of the zoom lens of Example 2, Figure 5 (b) shows a cross-sectional view of the middle of the zoom lens of Example 2, Figure 5 (c) shows a sectional view of the telephoto end of the zoom lens of Example 2. and, Figure 6 (a) an aberration diagram showing spherical aberration, astigmatism, and distortion at the wide-angle end of the zoom lens of Example 2, Figure 6 (b) an aberration diagram showing intermediate spherical aberration, astigmatism, and distortion of the zoom lens of Example 2, Figure 6 (c) An aberration diagram showing spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens of Example 2.

[0149] 【Table 2】

[0150] Example 2

[0151] f=4.43-9.65-21.05[wide angle, middle, telephoto]

[0152] Fno=2.88-4.46-5.17[wide angle, middle, telephoto]

[0153] Zoom ratio = 4.75

[0154] ...

Embodiment 3

[0166] The lens data of the zoom lens of Example 3 are shown in Table 3. in addition, Figure 7 (a) shows a cross-sectional view of the wide-angle end of the zoom lens of Example 3, Figure 7 (b) shows a cross-sectional view of the middle of the zoom lens of Example 3, Figure 7 (c) is a sectional view showing the telephoto end of the zoom lens of Example 3. FIG. and, Figure 8 (a) an aberration diagram showing spherical aberration, astigmatism, and distortion at the wide-angle end of the zoom lens of Example 3, Figure 8 (b) an aberration diagram showing intermediate spherical aberration, astigmatism, and distortion of the zoom lens of Example 3, Figure 8 (c) An aberration diagram showing spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens of Example 3. FIG.

[0167] 【table 3】

[0168] Example 3

[0169] f=4.42-9.66-20.98[wide angle, middle, telephoto]

[0170] Fno=2.88-4.49-5.01[wide angle, middle, telephoto]

[0171] Zoom rati...

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Abstract

The invention provides a zoom lens, a lens unit having the zoom lens and a camera, thus matching wide angle and ensuring large relative hole diameter, and excellent correcting each aberration; the zoom lens comprises first to fifth lens assemblies arranged from the object side in sequence; the first lens assembly has a refraction part; the fourth lens assembly comprises a 41 lens and a 42 lens arranged in sequence from the object side; the fifth lens assembly comprises a 51 lens, a 52 lens and a 53lens arranged in sequence from the object side; a formula is followed, wherein f2 refers to the focus length of the second lens assembly; f4 refers to the focus length of the fourth lens; fw refers to the combined focus length of the whole system; beta 4w refers to a transverse amplification rate of a wide angel of the fourth lens assembly; beta 4T refers to a transverse amplification rate of a telescope end of the fourth lens assembly.

Description

technical field [0001] The present invention relates to a zoom lens, a lens unit, and an imaging device, such as an optical unit for capturing a still image or a moving image of a subject with an imaging element, and more particularly relates to a zoom lens, a lens unit, and an image blur correction function capable of miniaturization. , a thinner and wider-angle zoom lens, a lens unit including the zoom lens, and an imaging device. Background technique [0002] Conventionally, as an optical system capable of reducing the thickness of a camera, a curved optical system in which the first lens group, which is the lens group closest to the object side of a zoom lens, is widely used. By mounting such a bending optical system in a camera, it is possible to take pictures without protruding the lens from the camera body during use, and thus the waterproofness and impact resistance of the camera can be improved. [0003] On the other hand, in view of the demand for thinner imaging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/14
CPCG02B15/173
Inventor 广瀬卓万
Owner KONICA MINOLTA INC
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