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Imaging lens and imaging apparatus

A camera lens and lens technology, applied in optical elements, instruments, optics, etc., can solve the problems of inability to cope with the miniaturization of the camera device and the lengthening of the overall optical length, and achieve the effects of good optical performance, small size, and low cost.

Active Publication Date: 2014-11-12
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a type of imaging lens, if a long back focus and optical performance are to be secured at the same time, the total optical length will inevitably become longer, and it cannot cope with the miniaturization of imaging devices expected in recent years.

Method used

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  • Imaging lens and imaging apparatus
  • Imaging lens and imaging apparatus
  • Imaging lens and imaging apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0148] The lens sectional view of the imaging lens of embodiment 1 is as follows figure 1 shown. figure 1 method of illustration, figure 1 The detailed descriptions of the lens group and each lens in the configuration example shown are as above, so repeated descriptions are omitted here.

[0149] Table 1 and Table 2 show basic lens data and aspheric coefficients of the imaging lens of Example 1, respectively. f described in the box of Table 1 represents the focal length of the entire system, BF represents the back focal length (air-converted length), 2ω represents the full field of view, and Fno. represents the F number, all of which are related to the d line.

[0150] In Table 1, the Si column shows the first surface number when the surface number of the component element closest to the object side is the first, and the surface number increases sequentially as it goes toward the image side. i (i=1, 2, 3, . . . ) face numbers. The radius of curvature of the i-th surface is...

Embodiment 2

[0170] The lens sectional view of the imaging lens of embodiment 2 is as follows figure 2 shown. Table 3 and Table 4 show basic lens data and aspheric coefficients of the imaging lens of Example 2, respectively. Figure 7 (A)~ Figure 7 (D) shows various aberration diagrams of the imaging lens of Example 2.

[0171] 【table 3】

[0172] Example 2 Basic Lens Data

[0173] f=24.83, BF=11.22, 2ω=61.0, Fno.=2.88

[0174]

[0175] 【Table 4】

[0176] Embodiment 2 Aspheric coefficient

[0177]

Embodiment 3

[0179] The lens sectional view of the imaging lens of embodiment 3 is as follows image 3 shown. Table 5 and Table 6 show basic lens data and aspheric coefficients of the imaging lens of Example 3, respectively. Figure 8 (A)~ Figure 8 (D) shows various aberration diagrams of the imaging lens of Example 3. FIG.

[0180] 【table 5】

[0181] Embodiment 3 basic lens data

[0182] f=21.82, BF=11.23, 2ω=67.4, Fno.=2.88

[0183]

[0184] 【Table 6】

[0185] Embodiment 3 Aspheric coefficient

[0186]

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Abstract

An imaging lens composed of a positive first lens group, an aperture stop, a positive second lens group, and a positive third lens group disposed in order from the object side. The first lens group includes one negative lens and one positive lens disposed in order from the object side. The second lens group includes one negative lens and one positive lens, has at least one aspherical surface, and is composed of three lenses or less, in which the most object side surface and the most image side surface of the second lens group are concave and convex surfaces respectively. The third lens group is composed of a negative lens with a concave surface on the object side and one or more positive lenses disposed in order from the object side.

Description

technical field [0001] The present invention relates to an imaging lens and an imaging device, and more specifically, to an imaging lens applicable to an electronic camera or the like, and an imaging device including such an imaging lens. Background technique [0002] In recent years, a large number of digital cameras equipped with a large image sensor conforming to the APS format or the 4 / 3 format, for example, have been supplied to the market. Recently, not only single-lens reflex cameras, but also interchangeable-lens digital cameras and compact cameras that use the above-mentioned large image sensor and do not have a reflective viewfinder have been provided. The advantages of these cameras are high image quality, and the overall compactness and portability of the system. [0003] As a compact imaging lens corresponding to such a large imaging element with a small number of lenses, imaging lenses described in Patent Documents 1 to 5, for example, have been proposed. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B13/00
CPCG02B13/0045G02B13/02
Inventor 铃木隆
Owner FUJIFILM CORP