Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

A technology of optical system and manufacturing method, applied in the field of variable power optical system, capable of solving problems such as insufficient optical performance

Active Publication Date: 2018-07-17
NIKON CORP
View PDF5 Cites 5 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
Effect test

Embodiment

[0105] 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".

[0106] In these figure 1 , Figure 6 , Figure 11 , Figure 16 , Figure 21 , Figure 26 In , e...

no. 1 Embodiment

[0116] 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 1Move 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 middl...

no. 2 Embodiment

[0146] 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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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. Furthermore, the intermediate group (GM) has a partial group that satisfies the following conditional expressions: 1.4<fvr / fMt<2.5, and 0.15<(-fvr) / ft<0.35, wherein fvr is the focal length of the partial group, fMt is the focal length of the intermediate group (GM) in the telescoping end state,and ft is the focal length of the variable power optical system (ZL) when in the telescoping end state.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/20
CPCG02B15/145113G02B15/1461G02B13/02
Inventor 町田幸介
Owner NIKON CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com