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Camera lens and camera device

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

Active Publication Date: 2020-04-03
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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  • Camera lens and camera device
  • Camera lens and camera device
  • Camera lens and camera device

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 method of illustration is as described above, so repeated description is omitted here. The imaging lens of Example 1 consists 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, the sign of the refractive power of each lens group, and the focusing method mentioned here are 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 first l...

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 the first lens group front group G1A in order from the object side. The first lens group and the rear group G1B are composed of six lenses, L13 to L18, in order from the object side, and the second lens group G2 is composed of 2 lenses, L21 to L22, in order from the object side. The third lens group G3 is composed of four lenses, namely lenses L31 to L34, in this 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. ...

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 in order from the object side, and the first lens group front group G1A is composed of the first lens group front group G1A in order from the object side. The first lens group and the rear group G1B are composed of six lenses, L13 to L18, in order from the object side, and the second lens group G2 is composed of 2 lenses, L21 to L22, in order from the object side. The third lens group G3 is composed of four lenses, namely lenses L31 to L34, in this 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 values ​​of various factors and variable surface intervals. Figure 9 Various aberration diagrams of the imaging lens of Example 3 are shown. ...

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Abstract

The present invention provides an imaging lens of an inner focus type that achieves a large imaging magnification, has small aberration fluctuations during focusing, and has good optical performance, and an imaging device including the imaging lens. The imaging lens is composed of a positive first lens group ( G1 ), a stop, a negative second lens group ( G2 ) and a positive third lens group ( G3 ) sequentially from the object side. Focusing is performed by moving only the second lens group (G2) in the optical axis direction. The second lens group (G2) consists of one or two positive lenses and one negative lens. The third lens group (G3) is composed of two or three positive lenses and one negative lens in order from the object side.

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 an imaging lens used in a camera in the above-mentioned field, an imaging lens of an inner focus system for focusing is proposed by moving a part of the lens group in the middle portion of the lens system. Compared with the group extraction method in which the entire lens system is moved to focus, the inner focus method can easily reduce the weight of the focus group that moves during focusing, and thus can achieve focusing with high operability and rapid autofocus control. In recent years, moving pictures using digital cameras have been increasing, and an inner focus system lens system having such advantages is useful. [0003] As the lens system of the inner focus system, fo...

Claims

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Application Information

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Patent Type & Authority Patents(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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