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Zoom lens and imaging apparatus

A zoom lens and zoom position technology, which is applied to optical elements, instruments, optics, etc., can solve the problems of insufficient suppression of aberration fluctuations, and it is difficult to take into account the fluctuations of image surface curvature. Effect

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

In the above-mentioned types, if the increase in magnification is promoted, the variation amount of field curvature at the time of focusing differs depending on the zoom area, so it is difficult to suppress the variation of field curvature at the time of focusing satisfactorily and maintain good performance in the entire zoom area. Realize high magnification at the same time
[0006] In the lens system described in Patent Document 1, since the focusing lens group with negative refractive power closest to the image side is not configured to move according to the zoom position, it is difficult to take into account the curvature of field at the zoom position of the intermediate focal length. Suppression of fluctuations and correction of spherical aberration at the telephoto end
In the lens system described in Patent Document 2, the suppression of aberration variation during focusing at the zoom position of the intermediate focal length is insufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] A cross-sectional view showing the structure of the zoom lens of Example 1 and a moving track are shown in figure 1 , and its illustration method and structure are as described above, so a part of repeated description is omitted here. The zoom lens of Example 1 includes a focus group GF, a variable magnification group GV, and a subsequent group GR in order from the object side toward the image side. The focus group GF sequentially includes a focus group front group GFf, a focus group middle group GFm, and a focus group rear group GFr from the object side toward the image side. The front group GFf of the focusing group is fixed relative to the image plane Sim during zooming and focusing. The group GFm in the focusing group includes a lens group, and moves along the optical axis Z when zooming and focusing. The rear group GFr of the focusing group moves along the optical axis Z when zooming and focusing. The zoom group GV includes three lens groups, the first zoom grou...

Embodiment 1

[0136] Example 1 Specifications

[0137] wide-angle end middle telephoto end Zr 1.00 3.84 40.50 f 10.003 38.383 405.111 FNo. 2.06 2.06 3.85 2ω(°) 60.36 15.90 1.54

[0138] [table 3]

Embodiment 1

[0139] Embodiment 1 group interval

[0140] Infinity object focus state

[0141] wide-angle end middle telephoto end DD[4] 12.193 12.143 12.193 DD[10] 1.200 0.845 12.178 DD[12] 1.500 81.385 121.772 DD[17] 36.985 1.350 4.891 DD[22] 104.216 48.276 8.672 DD[27] 5.008 17.103 1.395

[0142] The closest (2.8m) object focus status

[0143] wide-angle end middle telephoto end DD[4] 1.693 3.693 1.651 DD[10] 12.055 25.309 22.772 DD[12] 1.145 65.371 121.721 DD[17] 36.985 1.350 4.891 DD[22] 104.216 48.276 8.672 DD[27] 5.008 17.103 1.395

[0144] [Table 4]

[0145] The amount of movement when focusing in Example 1

[0146] wide-angle end middle telephoto end GFm -10.500 -8.450 -10.542 GR 0.355 16.014 0.052

[0147] Figure 11 Each aberration diagram of the state where the zoom lens of Example 1 is in focus on an obj...

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PUM

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Abstract

The invention provides a zoom lens and an imaging apparatus including the zoom lens. The zoom lens is capable of maintaining high optical performance and realizing high magnification by well suppressing variation of image surface bending during focusing in the whole zoom region. The zoom lens consists of, in order from an object side, a focusing group, a zoom group, and a subsequent group. The focusing group consists of, in order from the object side, a front focusing group which does not move with respect to the image plane during zooming and focusing, a middle focusing group which consists of one or two positive lens groups each moving during focusing, and a rear focusing group which consists of a negative lens group moving during zooming and focusing. The rear focusing group has a zoomrange in which the amount of movement during focusing changes in accordance with the zoom position and the rear focusing group moves to the image side during focusing from the object at infinity to the closest object. Predetermined conditional expressions relating to the amount of movement of the rear focusing group are satisfied.

Description

technical field [0001] The invention relates to a zoom lens and an imaging device. Background technique [0002] Conventionally, as a zoom lens used in a video camera for broadcasting, a movie camera, a digital camera, etc., it is known that a focus group including a lens group for focusing, a zoom group including a lens group for zooming, and a zoom lens group including a lens group for zooming are arranged in order from the most object side. The type of trunk group. For example, the following Patent Document 1 describes a zoom lens that includes, in order from the object side, a first lens group that includes a focusing lens group and that does not move when changing magnification, a second lens group that moves when changing magnification, and a lens group that does not move when changing magnification. One or more lens groups, aperture diaphragms and imaging lens groups that move in time. Also, Patent Document 2 describes a zoom lens that includes, in order from the ob...

Claims

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Application Information

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IPC IPC(8): G02B15/16
CPCG02B15/16G02B15/1465G02B15/167G02B15/177G02B15/144507G02B15/20
Inventor 米泽贤大田基在
Owner FUJIFILM CORP