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Optical system, optical apparatus equipped therewith, and method for manufacturing optical system

一种光学系统、光焦度的技术，应用在光学系统领域，能够解决像差校正不充分等问题，达到优良光学性能的效果

Active Publication Date: 2012-04-11
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, when the vibration reduction mechanism is applied to a conventional wide-angle optical system, aberration correction at the time of vibration reduction is insufficient
In addition, there is a problem that reflected light that produces ghost images and stray light is easily generated from the optical surface in such an optical system

Method used

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  • Optical system, optical apparatus equipped therewith, and method for manufacturing optical system
  • Optical system, optical apparatus equipped therewith, and method for manufacturing optical system
  • Optical system, optical apparatus equipped therewith, and method for manufacturing optical system

Examples

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no. 1 example

[0069] An optical system according to a first embodiment of the present application is explained below.

[0070] The optical system according to the first embodiment of the present application includes, in order from the object side, a first lens group, a second lens group having negative refractive power, and a third lens group having positive refractive power. The second lens group is movable in a direction including a component perpendicular to the optical axis. This optical system satisfies the following conditional expression (1):

[0071] 0.30

[0072] Here f represents the focal length of the optical system when focusing on an object at infinity, and f23 represents the combined focal length of the second lens group and the third lens group when focusing on an object at infinity.

[0073] In a short focal length lens, in order to secure a back focus distance sufficient for a single-lens reflex camera and a digital camera, it has been known that it is eff...

no. 2 example

[0142] Then, an optical system according to a second embodiment of the present application is explained below. An optical system according to a second embodiment includes a first lens group; a lens having a negative refraction that is placed on the image side of the first lens group and is movably placed in a direction including a component perpendicular to the optical axis power of the second lens group; a third lens group having positive refractive power placed on the image side of the second lens group; and an aperture stop placed on the image side of the second lens group . The second lens group includes a positive lens having a convex surface facing the object side.

[0143] In the optical system according to the second embodiment of the present application, by disposing the vibration reduction lens group which is the second lens group on the image side of the first lens group, it becomes possible to realize excellent aberration correction.

[0144] When performing vibr...

no. 3 example

[0211] Then, a third embodiment according to the present application is explained below. An optical system according to a third embodiment of the present application includes, in order from the object side, a first lens group, a second lens group having negative refractive power, and a third lens group having positive refractive power. The second lens group is a vibration reduction lens group that moves in a direction including a component perpendicular to the optical axis, thereby moving an image.

[0212] Also, the optical system according to the third embodiment of the present application satisfies the following conditional expression (8):

[0213] 2.00<∑dvr / f<5.00 (8)

[0214] Here Σdvr represents the distance between the most image-side lens surface of the second lens group and the paraxial focal plane of the optical system when focusing on an object at infinity, and f represents the entire optical system when focusing on an object at infinity focal length.

[0215] In...

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Abstract

The invention relates to an optical system, an optical apparatus equipped therewith, and a method for manufacturing the optical system. The optical system SL installed in a single-lens reflex camera includes, in order from an object side, a first lens group G1, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The second lens group G2 is disposed movably in a direction including a component perpendicular to an optical axis, and a given conditional expression is satisfied, thereby providing an optical system having excellent optical performance with excellent vibration reduction performance, an optical apparatus equipped with the optical system, and a method for manufacturing the optical system.

Description

[0001] The disclosures of the following priority applications are hereby incorporated by reference: [0002] Japanese Patent Application No. 2010-208867 filed on September 17, 2010; [0003] Japanese Patent Application No. 2010-208868 filed on September 17, 2010; [0004] Japanese Patent Application No. 2010-208869 filed on September 17, 2010; [0005] Japanese Patent Application No. 2011-141797 filed on June 27, 2011; [0006] Japanese Patent Application No. 2011-141811 filed on June 27, 2011; [0007] Japanese Patent Application No. 2011-151505 filed on July 8, 2011; [0008] Japanese Patent Application No. 2011-151506 filed on July 8, 2011; [0009] Japanese Patent Application No. 2011-151507 filed on July 8, 2011; and [0010] Japanese Patent Application No. 2011-173866 filed on Aug. 9, 2011. technical field [0011] The present invention relates to an optical system, an optical device equipped with the optical system, and a method for manufacturing the optical syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18G02B13/06G02B1/11G03B19/12
CPCG03B19/12G02B15/177G02B27/646G02B15/143505Y10T29/49885
Inventor 原田壮基田中一政
Owner NIKON CORP
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