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Zoom lens and imaging apparatus

A zoom lens and lens technology, which is applied in the fields of zoom lenses and camera devices, can solve the problems of insufficient chromatic aberration correction, large first lens group, insufficient lens chromatic aberration correction, etc., and achieve high performance in chromatic aberration and miniaturization of the device

Inactive Publication Date: 2016-10-05
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the lenses of Patent Documents 1 to 3 all have the problem that the first lens group is much larger than the image size.
In addition, the lens of Patent Document 1 has a long overall length, and in order to shorten the overall length, it is necessary to increase the refractive power of the first lens group, and accordingly, there is a problem of insufficient chromatic aberration correction.
In addition, the lenses of Patent Documents 2 and 3 are not sufficient for chromatic aberration correction.

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

[0138] The zoom lens of Example 1 is sequentially composed of the first lens group G1 which is fixed when zooming and has positive refractive power when zooming, and the first lens group G1 which moves so that the interval with the adjacent group in the optical axis direction changes when zooming. 2 lens groups G2 to 4th lens group G4 (moving lens group), and the 5th lens group G5 (final lens group) with positive refractive power which is arranged on the most image side and is fixed when changing magnification.

[0139] Table 1 shows the basic lens data of the zoom lens of Example 1, Table 2 shows the data related to various factors, Table 3 shows the data related to the changed surface interval, and Table 4 shows the data related to the aspheric coefficient data. Hereinafter, the meanings of the symbols in the tables will be described by taking the contents of Example 1 as an example, but the same applies to Examples 2 to 4.

[0140] In the lens data in Table 1, the column o...

Embodiment 2

[0174] Example 2 Lens data

[0175]

[0176]

[0177] 【Table 6】

[0178] Example 2. Various factors (d line)

[0179]

[0180] 【Table 7】

[0181] Example 2. Zoom interval

[0182]

[0183] 【Table 8】

[0184] Embodiment 2. Aspheric coefficient

[0185] face number

[0186] face number

Embodiment 3

[0188] Example 3 Lens data

[0189]

[0190]

[0191] 【Table 10】

[0192] Example 3 Various factors (d line)

[0193]

[0194] 【Table 11】

[0195] Example 3. Zoom interval

[0196]

[0197] 【Table 12】

[0198] Embodiment 3. Aspheric coefficient

[0199] face number

[0200] face number

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PUM

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Abstract

The present disclosure provides a compact and high performance zoom lens with successfully corrected chromatic aberration, and an imaging apparatus provided with the zoom lens. A zoom lens consists of, in order from the object side, a positive first lens group (G1) that is fixed during magnification change, at least two movable lens groups that are moved during magnification change, and a positive end lens group that is disposed at the most image side and is fixed during magnification change. The first lens group (G1) consists of, in order from the object side, a negative first-a lens group (G1a) that is fixed during focusing, a positive first-b lens group (G1b) that is moved during focusing, and a positive first-c lens group (G1c). The first-a lens group (G1a) includes at least two negative lenses, where the most object-side negative lens has a meniscus shape with the convex surface toward the object side, and a first-n lens, which is at least one negative lens of the rest of the negative lenses of the first-a lens group, satisfies given condition expressions (1) to (3).

Description

technical field [0001] The present invention relates to a zoom lens used in electronic cameras such as digital video cameras, video cameras, broadcast cameras, and surveillance cameras, and an imaging device equipped with the zoom lens. Background technique [0002] In video cameras for broadcasting and video cameras, because the change of the angle of view caused by focusing is disgusting, the following method is often used: the first lens group of the zoom lens is divided into the first lens group that is fixed at the time of focusing and has negative refractive power. - a lens group, a 1-b lens group having positive refractive power, and a 1-c lens group having positive refractive power, focusing is performed by moving the 1-b lens group. The zoom lenses of Patent Documents 1 to 3 are proposed as the zoom lens of the above-mentioned aspect. [0003] prior art literature [0004] Patent Document 1: Japanese Patent No. 5615143 [0005] Patent Document 2: Japanese Patent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/167
CPCG02B15/167G02B15/145119G02B27/0025
Inventor 米泽贤远山信明
Owner FUJIFILM CORP