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Zoom lens and image pickup unit

A zoom lens and lens group technology, applied in the field of zoom lenses, can solve the problem of high magnification design difficulty and achieve high magnification, small image blur compensation effect, and high image quality

Inactive Publication Date: 2013-12-25
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is extremely difficult to design to meet such demands as small size, high image quality, high magnification, and optical image blur compensation function at present

Method used

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  • Zoom lens and image pickup unit
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  • Zoom lens and image pickup unit

Examples

Experimental program
Comparison scheme
Effect test

example

[0092] [4. Numerical example of lens]

[0093]Specific numerical examples of the zoom lens according to the present embodiment will now be described. It should be pointed out that the meaning of each mark in the table and description is as follows. Assuming that the surface of the element closest to the object is the first surface, the notation "Ri" indicates the paraxial radius of curvature (mm) of the ith surface that is incrementally marked with respect to the image. The notation "Di" indicates the interval (mm) on the optical axis between the i-th surface and the (i+1)-th surface. The notation "Ni" indicates the value of the refractive index of the d-line 587.6 nm (nanometer) in the wavelength of the material (medium) constituting the i-th lens. The notation "νi" indicates the value of the dispersion coefficient (Abbe number) at the d-line of the material constituting the i-th lens. It should be noted that “DFL” represents the spacing of the filter FL, “NFL” represents ...

example 1

[0101] The zoom lens 1A according to Numerical Example 1 as a whole consists of figure 1 The 14 lens configuration shown. The first lens group GR1 has a positive refractive index as a whole, and is composed of four lenses, ie, first to fourth lenses L1-L4. It should be noted that the second lens L2 and the third lens L3 constitute a bonded lens having a bonding surface whose curvature radius is R4. Specifically, the concave surface on the image plane side of second lens L2 and the convex surface on the object side side of third lens L3 are bonded together with the same curvature radius R4. The surface on the side close to the image plane of first lens L1 and both surfaces of fourth lens L4 are each composed of an aspheric surface.

[0102] The second lens group GR2 has a negative refractive index as a whole, and is composed of three lenses, ie, fifth to seventh lenses L5-L7. The second lens group GR2 is mainly used to change the magnification, and its position can be moved ...

example 2

[0120] Like the zoom lens 1A according to Numerical Example 1, the zoom lens 1B according to Numerical Example 2 as a whole consists of Figure 5 The 14 lens configuration shown. The zoom lens 1B is different from the zoom lens 1A according to Numerical Example 1 in that the group is moved when the magnification is changed. In the zoom lens 1B, each of the first lens group GR1 , the second lens group GR2 , and the third lens group GR3 moves along the optical axis direction at the time of the magnification changing operation. The fourth lens group GR4 moves along the optical axis direction to compensate for focus position shift associated with changing magnification operation and for focusing. Other basic configurations are similar to those of the zoom lens 1A according to Numerical Example 1.

[0121] Tables 5-7 show specific lens data for the zoom lens 1B. In particular, Table 5 shows the basic lens data of the zoom lens 1B, and Table 7 shows the data of the aspheric surfa...

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PUM

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Abstract

A zoom lens includes: a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; a fourth lens group having a positive refracting power; and a fifth lens group having a positive refracting power and configured of sub lens groups. The first, the second, the third, the fourth, and the fifth lens groups are arranged in this order from an object plane. The third lens group serves as a first compensation lens group, and one or more of the plurality of sub lens groups serves as a second compensation lens group. Each of the first compensation lens group and the second compensation lens group independently shifts in a direction perpendicular to a light axis to allow an image formed on an image plane to be shifted in the direction perpendicular to the light axis.

Description

technical field [0001] The present invention relates to a zoom lens suitable for a compact digital video camera or digital still camera having a zoom factor of, for example, about 10-15 magnification, and an image pickup unit using such a zoom lens. In particular, the present invention contemplates a zoom lens having an optical image blur compensation function and an image pickup unit using the zoom lens. Background technique [0002] Recently, small image pickup units such as digital video cameras and digital still cameras have been widely used as home units. It is generally required to reduce the size of such a compact image pickup unit for portability, improve image quality, and increase magnification. Therefore, a photographic lens mounted in such a compact image pickup unit, especially a zoom lens, is also required to be downsized by reducing the overall length and depth, and to improve the performance of the lens. Also, recently, zoom lenses are highly demanded to ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/173G02B15/20G02B27/64
CPCG02B27/646G02B15/145129G02B13/009
Inventor 丰田浩司
Owner SONY CORP