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Variable power optical system, optical device, and method for producing variable power optical system

A technology of an optical system and a manufacturing method, which is applied in the field of variable magnification optical systems and can solve problems such as insufficient optical performance

Active Publication Date: 2018-08-03
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventional zoom optical system, the optical performance is insufficient

Method used

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  • Variable power optical system, optical device, and method for producing variable power optical system
  • Variable power optical system, optical device, and method for producing variable power optical system
  • Variable power optical system, optical device, and method for producing variable power optical system

Examples

Experimental program
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Effect test

Embodiment

[0096] 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 It is a cross-sectional view showing the structure and power distribution of the variable power optical system ZL{ZL(1)-ZL(6)} of the first to sixth embodiments. In the lower part of the cross-sectional views of the variable power optical systems ZL(1) to ZL(6), arrows show the trailing light of each lens group when zooming from the wide-angle end state (W) to the telephoto end state (T). The direction of movement of the axis. Furthermore, the moving direction of the follow-up side lens group GRP2 as the focusing lens group when focusing from infinity to a close-distance object is indicated by an arrow together with the word "focus".

[0097] In these figure 1 , Figure 6 , Figure 11 , Figure 16 , Figure 21 , Figure 26 In , e...

no. 1 Embodiment

[0107] use Figure 1 to Figure 5 And Table 1 describes the first embodiment. 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 the first embodiment consists of the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, and the second lens group G2 with positive optical power arranged in order from the object side. The power third lens group G3, the aperture stop S, the fourth lens group G4 having positive power, and the fifth lens group G5 having negative power constitute. When zooming from the wide-angle end state (W) to the telephoto end state (T), the first to fifth lens groups G1 to G5 respectively figure 1 Move in the direction indicated by the arrow. In this embodiment, the second lens group G2 constitutes the middle group GM, the third lens group G3 and the aperture stop S constitute the midd...

no. 2 Embodiment

[0136] use Figure 6 ~ Figure 10 And Table 2 describes the second embodiment. Figure 6 It is a figure which shows the lens structure of the variable power optical system of the 2nd Example of this embodiment. The variable power optical system ZL(2) of the second embodiment consists of the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, and the second lens group G2 with positive optical power arranged in order from the object side. The power third lens group G3, the aperture stop S, the fourth lens group G4 having positive power, and the fifth lens group G5 having negative power constitute. When zooming from the wide-angle end state (W) to the telephoto end state (T), the first to fifth lens groups G1 to G5 respectively Figure 6 Move in the direction indicated by the arrow. In this embodiment, the second lens group G2 constitutes the middle group GM, the third lens group G3 and the aperture stop S constitute the ...

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Abstract

This variable power optical system (ZL) is configured so as to have the following arranged in order from the object side: a first lens group (G1) having a positive refractive power; an intermediate group (GM) having at least one lens group and having an overall negative refractive power; an intermediate-side lens group (GRP1) having a positive refractive power; a successive-side lens group (GRP2)having a positive refractive power; and a successive group (GR) configured from at least one lens group. When focusing, the successive-side lens group (GRP2) moves. Furthermore, the following conditional expression is satisfied: 2.5<f1 / fRP1<5.0, wherein f1 is the focal length of the first lens group (G1), and fRP1 is the focal length of the intermediate-side lens group (GRP1).

Description

technical field [0001] The present invention relates to a variable power optical system, an optical device using the variable power optical system, and a manufacturing method of the variable power optical system. Background technique [0002] Conventionally, variable power optical systems suitable for photographic cameras, electronic still cameras, video cameras, and the like have been proposed (for example, refer to Patent Document 1). However, the conventional zoom optical system has insufficient optical performance. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Application Laid-Open No. 4-293007 Contents of the invention [0006] The variable power optical system of the present invention comprises a first lens group with positive refractive power arranged in order from the object side, an intermediate group having at least one lens group and having negative refractive power as a whole, and an intermediate group wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/20
CPCG02B27/646G02B15/145113G02B15/1461G02B5/005G02B9/62G02B13/009G02B13/02G02B13/18G02B15/14G02B15/20
Inventor 町田幸介
Owner NIKON CORP
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