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Imaging lens and imaging apparatus

一种成像透镜、透镜的技术，应用在安装、仪器、光学等方向，能够解决机构复杂、昂贵制造成本、没有充分满足小型化等问题，达到简化装置结构的效果

Active Publication Date: 2017-08-25
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lens system described in Patent Document 1 cannot assert that the total lens length is sufficiently short
The lens systems of Examples 1 to 5 of Patent Document 2 also have a large ratio of the total lens length to the size of the image sensor in the state of focusing on an object at infinity, and do not fully meet the recent demand for miniaturization.
In addition, the lens systems of Examples 1 to 3 of Patent Document 2 employ a floating focus system, so the mechanism for moving the lens group becomes complicated, resulting in an increase in the size of the lens barrel and high manufacturing costs.

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

[0126] A sectional view of the imaging lens of Example 1 is figure 1 The structure and illustration method of the imaging lens shown are the same as those described above, so repeated descriptions are omitted here. The imaging lens of Example 1 adopts, as a group structure, a first lens group G1 having a positive diopter, an aperture stop St, a second lens group G2 having a positive diopter, and a third lens group G3 having a positive diopter in order from the object side. 3 groups of structures. When focusing from an object at infinity to an object at the shortest distance, the first lens group G1 , the aperture stop St, and the second lens group G2 move toward the object side integrally, and the third lens group G3 is fixed with respect to the image plane Sim. The first lens group G1 includes three lenses, lenses L11 to L13, in order from the object side, the second lens group G2 includes four lenses, lenses L21 to L24, in order from the object side, and the third lens grou...

Embodiment 2

[0140] A sectional view of the imaging lens of Example 2 is shown in figure 2 middle. The group structure of the imaging lens of Example 2 is the same as that of Example 1. The first lens group G1 includes three lenses of lenses L11 to L13 in order from the object side, the second lens group G2 includes four lenses of lenses L21 to L24 in order from the object side, and the third lens group G3 includes lens L31 in order from the object side ~ L33 these 3 lenses. The basic lens data of the imaging lens of Example 2 are shown in Table 3, the specifications are shown in Table 4, and the aberration diagrams are shown in Figure 10 middle.

[0141] [table 3]

[0142] Example 2

[0143] Si Ri Di Ndj υdj 1 31.8182 3.5800 1.95375 32.32 2 72.8369 0.2900 3 24.3719 4.4900 1.51633 64.14 4 178.2414 0.0390 5 147.5914 1.5300 1.69895 30.13 6 17.1429 8.8100 7(St) ∞ 9.2900 8 -20.9076 2.8500 1.59282 ...

Embodiment 3

[0148] A sectional view of the imaging lens of Example 3 is shown in image 3 middle. The group structure of the imaging lens of Example 3 is the same as that of Example 1. The first lens group G1 includes three lenses of lenses L11 to L13 in order from the object side, the second lens group G2 includes four lenses of lenses L21 to L24 in order from the object side, and the third lens group G3 includes lens L31 in order from the object side ~ L33 these 3 lenses. The basic lens data of the imaging lens of Example 3 are shown in Table 5, the specifications are shown in Table 6, and the aberration diagrams are shown in Table 6. Figure 11 middle.

[0149] [table 5]

[0150] Example 3

[0151] Si Ri Di Ndj υdj 1 25.9959 4.5800 1.83481 42.72 2 67.9810 0.2000 3 24.4138 4.3100 1.51633 64.14 4 149.7073 0.0390 5 140.7795 0.8400 1.63980 34.47 6 15.8829 10.1617 7(St) ∞ 7.5000 8 -18.1394 2.9400 ...

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Abstract

The imaging lens consists of, in order from the object side, a first lens group G1 having a positive power, a diaphragm, a second lens group G2 having a positive power, and a third lens group G3. Each of the lens groups includes three or more lenses. A positive lens is disposed on a most object side in the first lens group G1, and a meniscus lens, which is concave toward the object side, is disposed to be closest to the object side in the second lens group G2. During focusing from an infinite distance object to a close-range object, elements ranging from the first lens group G1 to the second lens group G2 integrally move toward the object side, and the third lens group G3 remains stationary. The imaging lens satisfies a conditional expression about a radius of curvature of an air lens of the first lens group G1.

Description

technical field [0001] The present invention relates to an imaging lens suitable for a digital camera and / or a video camera, etc., and an imaging device including the imaging lens. Background technique [0002] Conventionally, lenses described in Patent Document 1 and Patent Document 2 below, for example, have been proposed as imaging lenses that can be used in cameras in the above-mentioned fields. Patent Document 1 describes that the first lens group having a positive diopter, the second lens group having a negative diopter, the third lens group, and the fourth lens group having a positive diopter are sequentially included from the object side, and that on the object side of the aperture stop, A lens system with a cemented lens is arranged on the front. [0003] Patent Document 2 describes an imaging lens of a front focus system that focuses by moving a lens group on the object side. In the imaging lenses of Examples 4 to 5 of Patent Document 2, when focusing, the lens g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/163
CPCG02B15/163G02B9/64G02B13/16G02B7/10G02B9/12G02B13/001
Inventor 近藤雅人
Owner FUJIFILM CORP