Imaging lens and imaging apparatus

A camera lens and lens technology, applied in instruments, subcutaneous biometrics, computing, etc., can solve the problem of small shooting magnification and achieve the effect of large shooting magnification

Active Publication Date: 2016-12-21
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The lens systems described in Patent Documents 1 to 4 are telephoto lenses, and the shooting magnification obtained is small.

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

[0190] figure 1 The lens structure and optical path of the imaging lens of Example 1 are shown, and the illustration method is as described above, so repeated descriptions are omitted here. The imaging lens of Example 1 is composed of 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 in order from the object side. G3 composition. The focusing group is only the second lens group G2, and when focusing from an object at infinity to the nearest 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 also the same for the imaging lenses of Examples 2 to 6 described later.

[0191] In the imaging lens of Example 1, the first lens group G1 is composed of the first lens group front group G1A and the ...

Embodiment 2

[0215] 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 the first lens group front group G1A and the first lens group rear group G1B in order from the object side, and the first lens group front group G1A is composed of Lenses L11 to L12 are composed of two lenses. The first lens group rear group G1B is composed of six lenses L13 to L18 in order from the object side, and the second lens group G2 is composed of lenses L21 to L22 in order from the object side. The third lens group G3 is composed of four lenses of 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 values ​​of various factors and variable surface intervals. Figure 8 Various aberration diagrams of the imaging lens of Example 2 are shown.

[0216] 【Table 4】

[0217] Example 2

[0218] Si ...

Embodiment 3

[0226] 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 the first lens group front group G1A and the first lens group rear group G1B sequentially from the object side, and the first lens group front group G1A is composed of Lenses L11 to L12 are composed of two lenses. The first lens group rear group G1B is composed of six lenses L13 to L18 in order from the object side, and the second lens group G2 is composed of lenses L21 to L22 in order from the object side. The third lens group G3 is composed of four lenses of lenses L31 to L34 in order from the object side. Table 7 shows the basic lens data of the imaging lens of Example 3, Table 8 shows aspheric coefficients, and Table 9 shows the values ​​of various factors and variable surface intervals. Picture 9 Various aberration diagrams of the imaging lens of Example 3 are shown.

[0227] 【Table 7】

[0228] Example 3

[0...

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PUM

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Abstract

The present disclosure provides an imaging lens that adopts the inner focus method that is capable of obtaining a large reproduction ratio, in which fluctuations in aberrations caused by focusing operations is small, and which has favorable optical performance. The present disclosure also provides an imaging apparatus to which this imaging lens is applied. The imaging lens is constituted by, in order from the object side to the image side: a positive first lens group (G1); a stop; a negative second lens group (G2); and a positive third lens group (G3). Only the second lens group (G2) moves in the direction of the optical axis to perform focusing operations. The second lens group (G2) is constituted by one or two positive lenses and one negative lens. The third lens group (G3) is constituted by, in order from the object side to the image side, two or three 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 a digital camera, a video camera, etc., and an imaging device including such an imaging lens. Background technique [0002] Conventionally, as an imaging lens used in a camera in the above-mentioned field, an imaging lens of an internal focus method in which a part of the lens group in the middle portion of the lens system is moved to perform focusing has been proposed. Compared with the entire group extraction method in which the entire lens system is moved to perform focusing, the inner focusing method can easily lighten the focus group that moves during focusing, and therefore can achieve highly operable focusing and rapid autofocus control. In recent years, the use of digital cameras for movie shooting has increased, and the lens system of the internal focusing method having such advantages is useful. [0003] As the lens system o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/16
CPCG02B15/16G02B13/16G02B9/64G02B9/08G02B9/12G02B13/0045G02B13/0035G02B5/005G02B13/008G02B9/14G02B27/0081G02B13/18G02B27/0025G06V40/10G06V40/14
Inventor 孙萍
Owner FUJIFILM CORP
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