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Variable magnification optical system, optical device, imaging device, and manufacturing method of variable magnification optical system

一种光学系统、光焦度的技术，应用在变倍光学系统领域，能够解决对焦透镜组轻量化不充分等问题

Active Publication Date: 2019-07-02
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in the conventional variable power optical system, the weight reduction of the focusing lens group was insufficient

Method used

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  • Variable magnification optical system, optical device, imaging device, and manufacturing method of variable magnification optical system
  • Variable magnification optical system, optical device, imaging device, and manufacturing method of variable magnification optical system
  • Variable magnification optical system, optical device, imaging device, and manufacturing method of variable magnification optical system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0197] Hereinafter, a variable power optical system (zoom lens) ZL according to an example of the present embodiment will be described with reference to the drawings. figure 1 , Figure 6 , Figure 11 , Figure 16 , Figure 21 , Figure 26 , Figure 31 , Figure 36 , Figure 41 , Figure 46 , Figure 51 , Figure 54 , Figure 57 It is a cross-sectional view showing the configuration and distribution of power of the variable power optical system ZL {ZL(1) to ZL(13)} of the first to thirteenth embodiments. In the lower part of the cross-sectional views of the variable power optical systems ZL(1)~ZL(13), the arrows show the lengths of each lens group along the optical axis when zooming from the wide-angle end state (W) to the telephoto end state (T) direction of movement. Furthermore, arrows are used together with the words "focus" to indicate the moving direction of the focus group GRN when focusing from infinity to a close object.

[0198] in the above figure 1 , ...

no. 1 Embodiment

[0208] use figure 1 The first embodiment will be described with Table 1. figure 1 It is a figure which shows the lens structure of the variable power optical system of the 1st Example of this embodiment. The variable power optical system ZL(1) of this embodiment consists of the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, and the third lens group G3 with positive refractive power from the object side. , a fourth lens group G4 with negative refractive power and a fifth lens group G5 with positive refractive power. The sign (+) or (-) attached to the symbol of each lens group represents the refractive power of each lens group, and this is the same in all the following examples.

[0209] As the relationship between this structure and the above-mentioned embodiment, the first lens group G1 corresponds to the front lens group GFS, the second lens group G2 corresponds to the M1 lens group GM1, the third lens group G3 ...

no. 2 Embodiment

[0243] Figure 6 It is a figure which shows the lens structure of the variable power optical system of the 2nd Example of this application. The variable power optical system of this embodiment consists of the first lens group G1 with positive power, the second lens group G2 with negative power, the third lens group G3 with negative power, and the third lens group G3 with positive power from the object side. The 4th lens group G4 with a refractive power, the 5th lens group G5 with a negative refractive power, and the 6th lens group G6 with a positive refractive power are comprised.

[0244] As the relationship between this structure and the above-mentioned embodiment, the first lens group G1 corresponds to the front lens group GFS, the second lens group G2 and the third lens group G3 correspond to the M1 lens group GM1, and the fourth lens group G4 corresponds to the M2 lens. In the group GM2, the fifth lens group G5 corresponds to the RN lens group GRN, and the sixth lens gro...

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Abstract

This variable magnification optical system comprises, in order from the object side, a front lens group (GFS) having positive refractive power, an M1 lens group (GM1) having negative refractive power,an M2 lens group (GM2) having positive refractive power, an RN lens group (GRN) having negative refractive power, and a subsequent lens group (GRS). When changing magnification, the interval betweenthe front lens group (GFS) and the M1 lens group (GM1) changes, the interval between the M1 lens group (GM1) and the M2 lens group (GM2) changes, and the interval between the M2 lens group (GM2) and the RN lens group (GRN) changes, and, when focusing from an object at infinity to a near object, the RN lens group (GRN) moves.

Description

technical field [0001] The present invention relates to a variable magnification optical system, an optical device and an imaging device using the variable magnification optical system, and a manufacturing method of the variable magnification optical system. Background technique [0002] Conventionally, variable magnification optical systems suitable for photographic cameras, electronic still cameras, video cameras, and the like have been disclosed (for example, refer to Patent Document 1). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Application Laid-Open No. 4-293007 [0006] However, in the conventional variable power optical system, the weight reduction of the focus lens group is insufficient. Contents of the invention [0007] The variable magnification optical system of the present invention comprises, from the object side, a front side lens group with positive refractive power, an M1 lens group with negative ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/20
CPCG02B27/646G02B15/20G02B15/145121G02B9/60G02B9/62G02B9/64G02B15/173G02B15/1451G02B15/145105G02B15/145125G02B15/146
Inventor 町田幸介
Owner NIKON CORP
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