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Variable magnification optical system and image pickup apparatus using the same

An optical system, optical axis technology, applied in the field of variable magnification optical system, camera device, to achieve the effect of large field of view

Inactive Publication Date: 2017-10-20
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in Patent Documents 1 to 3, it is impossible to ensure a large angle of view at the wide-angle end, secure a small F-number, and correct various aberrations at the same time.

Method used

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  • Variable magnification optical system and image pickup apparatus using the same
  • Variable magnification optical system and image pickup apparatus using the same
  • Variable magnification optical system and image pickup apparatus using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0600] The variable magnification optical system of Example 1 is composed of a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, and a lens group G3 having negative refractive power in order from the object side. The fourth lens group G4, the fifth lens group G5 having positive refractive power, and the sixth lens group G6 having positive refractive power. The aperture stop S is disposed between the second lens group G2 and the third lens group G3.

[0601] The first lens group G1 is composed of a negative meniscus lens L1 with a convex surface facing the object side, a positive meniscus lens L2 with a convex surface facing the object side, and a positive meniscus lens L3 with a convex surface facing the object side. Here, negative meniscus lens L1 and positive meniscus lens L2 are bonded.

[0602] The second lens group G2 is composed of a negative meniscus len...

Embodiment 2

[0610] The variable magnification optical system of Embodiment 2 consists of the first lens group G1 having positive refractive power, the second lens group G2 having negative refractive power, the third lens group G3 having positive refractive power, and the fourth lens group G3 having negative refractive power from the object side. The lens group G4, the fifth lens group G5 having positive refractive power, and the sixth lens group G6 having positive refractive power constitute. The aperture stop S is disposed between the second lens group G2 and the third lens group G3.

[0611] The first lens group G1 is composed of a negative meniscus lens L1 with a convex surface facing the object side, a positive meniscus lens L2 with a convex surface facing the object side, and a positive meniscus lens L3 with a convex surface facing the object side. Here, negative meniscus lens L1 and positive meniscus lens L2 are bonded.

[0612] The second lens group G2 is composed of a negative me...

Embodiment 3

[0620] The variable power optical system of Embodiment 3 consists of the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, the third lens group G3 with positive refractive power, and the fourth lens group G3 with negative refractive power from the object side. The lens group G4, the fifth lens group G5 having positive refractive power, and the sixth lens group G6 having positive refractive power constitute. The aperture stop S is disposed between the second lens group G2 and the third lens group G3.

[0621] The first lens group G1 is composed of a negative meniscus lens L1 with a convex surface facing the object side, a positive meniscus lens L2 with a convex surface facing the object side, and a positive meniscus lens L3 with a convex surface facing the object side. Here, negative meniscus lens L1 and positive meniscus lens L2 are bonded.

[0622] The second lens group G2 is composed of a negative meniscus lens L4 w...

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Abstract

A variable magnification optical system includes, sequentially from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit, and a fifth lens unit having a positive refractive power, and each of the lens units makes a different movement relatively to a lens unit that is adjacently positioned at least at one of a time of changing magnification, a time of focusing, and a time of image stabilization.

Description

technical field [0001] The present invention relates to a variable power optical system and an imaging device with the variable power optical system. Background technique [0002] In recent years, imaging optical systems have been used in a wide range of fields, such as digital cameras, video cameras, surveillance cameras, cameras for video conference systems, and the like. [0003] A zoom optical system is used in such an imaging optical system. As the zoom optical system, there are zoom optical systems disclosed in Patent Document 1, Patent Document 2, and Patent Document 3. The zoom optical system of Patent Document 1 includes a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power in order from the object side. [0004] The zoom optical systems disclosed in Patent Document 2 and Patent Document 3 include, in or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/173
CPCG02B15/1461G02B27/646G02B15/16G02B15/163G02B27/0025
Inventor 河村一辉
Owner OLYMPUS CORP