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Camera lens and camera device

A camera lens and lens technology, applied in focusing devices, instruments, optics, etc., can solve the problems of large focal length of the lens, large chromatic aberration of the lens system, and the inability to fully meet the current requirements of small size, etc., to achieve high optical performance, wide field of view, The effect of high-speed focus

Active Publication Date: 2020-06-12
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the lens system described in Patent Document 1, the value of the total length of the lens is relatively large relative to the focal length of the entire system, and cannot sufficiently meet the current demand for compactness.
The lens system described in Patent Document 2 assumes a telephoto lens, and may not be said to have a sufficiently large angle of view depending on the required specifications of the lens system.
The lens system described in Patent Document 3 has large chromatic aberration

Method used

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  • Camera lens and camera device
  • Camera lens and camera device
  • Camera lens and camera device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] figure 2 A cross-sectional view of the imaging lens of Example 1 is shown. The imaging lens of Example 1 adopts the following three-group structure as a group configuration: the first lens group G1 having positive refractive power, the second lens group G2 having negative refractive power, and the aperture stop St , and a third lens group G3 with positive refractive power. When focusing from an object at infinity to the nearest object, the first lens group G1, the aperture stop St, and the third lens group G3 are fixed relative to the image plane Sim, and the second lens group G2 moves from the object side to the image side. It should be noted, figure 2 The shown aperture stop St does not necessarily indicate the size or shape, but indicates the position on the optical axis Z.

[0158] In the imaging lens of Example 1, the first lens group G1 is composed of three lenses, lenses L11 to L13, in order from the object side; It is composed of five lenses of lenses L31 ...

Embodiment 2

[0181] image 3 A cross-sectional view of the imaging lens of Example 2 is shown. The group structure of the imaging lens of the second embodiment, the components that move during focusing, and the moving directions thereof are the same as those of the first embodiment. In the imaging lens of Example 2, the first lens group G1 is composed of three lenses, lenses L11 to L13, in order from the object side; It is constituted by four lenses of lenses L31 to L34 in order from the side. Table 3 shows the basic lens data of the imaging lens of Embodiment 2, and Table 4 shows the aspheric coefficients, Figure 12 Each aberration diagram in a state of focusing on an object at infinity is shown.

[0182] 【table 3】

[0183] Example 2

[0184] f=36.431, FNo.=2.06, 2ω=44.2°

[0185] Si Ri Di Ndj vdj 1 53.85025 2.500 1.81600 46.62 2 211.65751 0.200 3 27.76456 4.010 1.81600 46.62 4 -231.53413 0.950 1.95906 17.47 5 123.04063 2.76...

Embodiment 3

[0190] Figure 4 A cross-sectional view of the imaging lens of Example 3 is shown. The configuration of the imaging lens group of the third embodiment, the components that move during focusing, and the moving directions thereof are the same as those of the first embodiment. In the imaging lens of Example 3, the first lens group G1 is composed of three lenses, lenses L11 to L13, in order from the object side; It is composed of five lenses of lenses L31 to L35 in order from the side. Table 5 shows the basic lens data of the imaging lens of Embodiment 3, and Table 6 shows the aspheric coefficients, Figure 13 Each aberration diagram in a state of focusing on an object at infinity is shown.

[0191] 【table 5】

[0192] Example 3

[0193] f=37.710, FNo.=2.10, 2ω=42.0°

[0194] Si Ri Di Ndj vdj 1 35.97790 3.000 1.88300 40.76 2 258.33611 0.100 3 29.92078 4.135 1.75500 52.32 4 -609.75609 1.750 1.89286 20.36 5 62.70949 4.25...

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Abstract

An imaging lens is constituted by, in order from the object side to the image side, a positive first lens group, a negative second lens group, and a positive third lens group. During focusing operations, the first lens group and the third lens group are fixed, while the second lens group moves. The first lens group has a cemented lens formed by cementing a positive lens and a negative lens together. The second lens group is constituted by two or fewer lenses. The third lens group is constituted by three or more lenses. The surface toward the object side of at least one of the first and second lenses from the object side within the third lens group is concave. A negative lens having a concave surface toward the object side is provided most toward the image side. A predetermined conditional formula is satisfied.

Description

technical field [0001] The present invention relates to an imaging lens and an imaging device, and particularly relates to an imaging lens suitable for a digital camera, a video camera, and the like, and an imaging device including such an imaging lens. Background technique [0002] Conventionally, as a lens for an interchangeable lens digital camera, an internal focus type imaging lens in which focusing is performed by moving a part of the lens group in the middle portion of the lens system has been proposed. For example, in the following patent documents 1 to 3, there are described lens systems of the inner focus type as follows: from the object side, a first lens group having positive refractive power, a second lens group having negative refractive power, and a second lens group having The third lens group with positive refractive power is configured to move the second lens group from the object side to the image side to focus from an object at infinity to the nearest obj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/06G02B13/18
CPCG02B13/0035G02B13/06G02B13/18G02B13/0045G02B13/006G02B27/0025G03B13/36
Inventor 近藤雅人铃木隆
Owner FUJIFILM CORP