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Zoom lens and imaging apparatus

A zoom lens and lens technology, applied in optical elements, instruments, optics, etc., can solve the problems of insufficient suppression and insufficient miniaturization, and achieve the effect of good change in chromatic aberration

Active Publication Date: 2020-02-28
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lens system described in Patent Document 2 also does not sufficiently suppress variation in axial chromatic aberration from the wide-angle end to the intermediate region, and the miniaturization of the entire system is also insufficient.

Method used

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  • Zoom lens and imaging apparatus
  • Zoom lens and imaging apparatus
  • Zoom lens and imaging apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] A sectional view showing the structure of the zoom lens of Example 1 is shown in figure 1 In , its illustration method and structure are as described above, so a part of repetitive description is omitted here. The zoom lens of Embodiment 1 includes, from the object side toward the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having negative refractive power, and a fourth lens group G3 having positive refractive power. Lens group G4. The middle group Gm includes the second lens group G2 and the third lens group G3. The subsequent group Gs includes a fourth lens group G4. When zooming, the first lens group G1 and the fourth lens group G4 are fixed relative to the image plane Sim, and the second lens group G2 and the third lens group G3 change the distance between adjacent lens groups to move along the optical axis Z .

[0134] The first lens group G1 includes 11 lense...

Embodiment 2

[0162] A sectional view showing the structure of the zoom lens of Example 2 is shown in image 3 middle. The zoom lens of Example 2 includes, from the object side toward the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having negative refractive power, and a fourth lens group G3 having negative refractive power. Lens group G4 and a fifth lens group G5 with negative refractive power. The middle group Gm includes the second lens group G2, the third lens group G3, and the fourth lens group G4. The subsequent group Gs includes a fifth lens group G5. When zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim, and the second lens group G2, the third lens group G3, and the fourth lens group G4 change the distance between adjacent lens groups while moving along the optical axis Z.

[0163] The first lens group G1 includes five lense...

Embodiment 3

[0178] A cross-sectional view showing the structure of the zoom lens of Example 3 is shown in Figure 4 middle. The zoom lens of Example 3 includes, from the object side toward the image side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having negative refractive power, and a fourth lens group G3 having negative refractive power. Lens group G4, fifth lens group G5 with negative refractive power, and sixth lens group G6 with positive refractive power. The middle group Gm includes the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5. The subsequent group Gs includes a sixth lens group G6. When zooming, the first lens group G1 and the sixth lens group G6 are fixed relative to the image plane Sim, and the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 change the positions adjacent to e...

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Abstract

The invention provides a zoom lens and an imaging apparatus including the zoom lens, wherein the zoom lens is miniaturized, variation of chromatic aberration on an axis from a wide-angle end to an intermediate region is well suppressed, and the zoom lens has high optical performance. The zoom lens consists of, in order from an object side: a positive first lens group that does not move during zooming; a middle group that consists of two or more movable lens groups moving during zooming; and a subsequent group that has a lens group including a stop at a position closest to the object side. Themiddle group has at least two negative movable lens groups. The subsequent group includes at least one positive LA lens that satisfies predetermined conditional expressions relating to the refractiveindex, the Abbe number, and the partial dispersion ratio.

Description

technical field [0001] The invention relates to a zoom lens and an imaging device. Background technique [0002] Conventionally, as zoom lenses used in broadcast cameras, movie cameras, and digital cameras, etc., a lens group having a positive refractive power, a moving lens group that moves when changing magnification, and a subsequent group including a diaphragm are known in order from the most object side. , and the type that keeps the total length of the lens system constant when changing magnification. For example, Patent Document 1 and Patent Document 2 described below describe a zoom lens having a 5-group or 6-group structure of the above type. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2016-071141 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2016-109952 [0005] Zoom lenses used in the above-mentioned cameras are required to be compact and high in performance. In order to achieve a compact and high-performance configuration, it is impo...

Claims

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Application Information

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IPC IPC(8): G02B15/17
CPCG02B15/17G02B15/167G02B15/1465G02B15/144109
Inventor 米泽贤小松大树椚濑高志
Owner FUJIFILM CORP
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