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Camera lens and camera device

A camera lens, lens technology, applied in optical components, instruments, optics, etc., can solve the problem of small shooting magnification, and achieve the effect of large shooting magnification

Active Publication Date: 2020-03-03
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the imaging magnification obtained by the lens systems described in Patent Documents 1 and 2 is small.

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

[0192] figure 1 The lens structure and the optical path of the imaging lens of Example 1 are shown, and the method of illustration is as described above, so repeated descriptions are omitted here. The imaging lens of Example 1 is composed of, in order from the object side, a first lens group G1 having positive refractive power, an aperture stop St, a second lens group G2 having negative refractive power, and a third lens group having positive refractive power G3 composition. The focusing group is only the second lens group G2, and when focusing from an object at infinity to the closest object, the second lens group G2 moves to the image side. It should be noted that the three-group structure mentioned here, the sign of the refractive power of each lens group, and the method of focusing are the same for the imaging lenses of Examples 2 to 6 to be described later.

[0193] In the imaging lens of Example 1, the first lens group G1 is composed of a first lens group front group G...

Embodiment 2

[0217] figure 2 The lens structure and optical path of the imaging lens of Example 2 are shown. In the imaging lens of Example 2, the first lens group G1 is composed of a first lens group front group G1A and a first lens group rear group G1B in order from the object side, and the first lens group front group G1A is composed of, in order from the object side, Lenses L11 to L12 are composed of two lenses, the rear group G1B of the first lens group is composed of six lenses L13 to L18 in order from the object side, and the second lens group G2 is composed of two lenses L21 to L22 in order from the object side The third lens group G3 is composed of four lenses, lenses L31 to L34, in order from the object side. Table 4 shows basic lens data of the imaging lens of Example 2, Table 5 shows aspheric coefficients, and Table 6 shows various factors and values ​​of variable surface spacing. Figure 8 Aberration diagrams of the imaging lens of Example 2 are shown.

[0218] 【Table 4】 ...

Embodiment 3

[0228] image 3 The lens structure and optical path of the imaging lens of Example 3 are shown. In the imaging lens of Example 3, the first lens group G1 is composed of a first lens group front group G1A and a first lens group rear group G1B in order from the object side, and the first lens group front group G1A is composed of, in order from the object side, Lenses L11 to L12 are composed of two lenses, the rear group G1B of the first lens group is composed of six lenses L13 to L18 in order from the object side, and the second lens group G2 is composed of two lenses L21 to L22 in order from the object side The third lens group G3 is composed of four lenses, lenses L31 to L34, in order from the object side. Table 7 shows basic lens data of the imaging lens of Example 3, Table 8 shows aspheric coefficients, and Table 9 shows various factors and values ​​of variable surface spacing. Figure 9 Aberration diagrams of the imaging lens of Example 3 are shown.

[0229] 【Table 7】

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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 stop; a negative second lens group; and a positive third lens group. Only the second lens group moves in the direction of the optical axis to perform focusing operations. The first lens group is constituted by, in order from the object side to the image side, a first lens group front group and a first lens group rear group. The first lens group front group is constituted by, in order from the object side to the image side, one positive lens and one negative lens, the first lens group rear group includes at least two negative lenses and at least three positive lenses. The second lens group is constituted by one or two positive lenses and one negative lens.

Description

technical field [0001] The present invention relates to an imaging lens and an imaging device, and more particularly, to an imaging lens suitable for digital cameras, video cameras, and the like, and an imaging device including such an imaging lens. Background technique [0002] Conventionally, as imaging lenses used in cameras in the above-mentioned fields, there have been proposed imaging lenses of an inner focus type in which a part of the lens group in the middle portion of the lens system is moved and focused. Compared with the entire group extraction method, which moves the entire lens system to focus, the internal focus method can easily reduce the weight of the focus group that moves during focusing, so that highly operable focusing and rapid autofocus control can be realized. In recent years, the use of digital cameras for photographing movies has increased, and an inner focus lens system having such an advantage is useful. [0003] As the lens system of the intern...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00
CPCG02B13/0045G02B9/64G02B13/16G02B5/005G02B9/00G02B9/08G02B9/12G02B9/14G02B13/0035G02B13/18
Inventor 孙萍
Owner FUJIFILM CORP
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