Zoom lens and optical apparatus

A zoom lens and lens group technology, applied in optics, optical components, instruments, etc., can solve the problems of large optical system size, small F value, and difficult to realize the structure of the F value optical system, and achieve good optical performance and small F value Effect

Active Publication Date: 2016-05-25
FUJIFILM CORP
View PDF10 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the F value of the zoom lenses described in Patent Documents 1 to 3 is 4 or more, so it cannot be considered that the F value is small.
In the above-mentioned lens system, the second lens group of the moving group arranged next to the reduction side of the first lens group, which is the fixed group, is set as a negative lens group, so it is difficult to realize the structure of an optical system with a small F value.
In the zoom lens described in Patent Document 4, the size of the optical system is large relative to the focal length, and it cannot be considered that it can meet the demands for miniaturization in recent years.

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
  • Zoom lens and optical apparatus
  • Zoom lens and optical apparatus
  • Zoom lens and optical apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] The structural diagram of the zoom lens of embodiment 1 is as figure 1 , figure 2 shown. The zoom lens of Example 1 has a six-group structure composed of the first lens group G1 to the sixth lens group G6. The first lens group G1 has negative refractive power as a whole, and is composed of a front group G1A and a rear group G1B. The front group G1A is composed of lenses L11 to L14. The rear group G1B is composed of lenses L15 to L18. The second lens group G2 is composed of only the lens L21. The third lens group G3 is composed of lenses L31 to L32. The fourth lens group G4 is composed of lenses L41 to L44. The fifth lens group G5 is composed of lenses L51 to L52. The sixth lens group G6 is composed of only the lens L61. Focusing is performed by moving only the front group G1A in the optical axis direction.

[0101] Table 1 and Table 2 respectively show the basic lens data and the value of the variable surface interval of the zoom lens of Example 1. In the Si ...

Embodiment 2

[0115] image 3 A lens configuration diagram showing the zoom lens of Example 2, Figure 4 The optical path diagram at the wide-angle end is shown. The zoom lens of Example 2 has a six-group structure composed of the first lens group G1 to the sixth lens group G6. The first lens group G1 has negative refractive power as a whole, and is composed of a front group G1A and a rear group G1B. The front group G1A is composed of lenses L11 to L14. The rear group G1B is composed of lenses L15 to L18. The second lens group G2 is composed of only the lens L21. The third lens group G3 is composed of lenses L31 to L32. The fourth lens group G4 is composed of lenses L41 to L44. The fifth lens group G5 is composed of lenses L51 to L52. The sixth lens group G6 is composed of only the lens L61. Focusing is performed by moving only the rear group G1B in the optical axis direction.

[0116] Table 3 and Table 4 respectively show the basic lens data and the value of the variable surface i...

Embodiment 3

[0125] Figure 5 A lens configuration diagram showing the zoom lens of Example 3, Figure 6 The optical path diagram at the wide-angle end is shown. The zoom lens of Example 3 has a five-group structure composed of the first lens group G1 to the fifth lens group G5. The first lens group G1 has negative refractive power as a whole, and is composed of a front group G1A and a rear group G1B. The front group G1A is composed of lenses L11 to L14. The rear group G1B is composed of lenses L15 to L18. The second lens group G2 is composed of only the lens L21. The third lens group G3 is composed of lenses L31 to L32. The fourth lens group G4 is composed of lenses L41 to L46. The fifth lens group G5 is composed of only the lens L51. A floating focus method in which focusing is performed by moving the front group G1A and the rear group G1B in the optical axis direction so that the distance between the front group G1A and the rear group G1B changes.

[0126] Table 5 and Table 6 sh...

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

A zoom lens is equipped with: a first lens group, which is fixed when changing magnification, provided most toward the magnification side; and a second lens group having a positive refractive power, which moves when changing magnification, provided adjacent to the first lens group at the reduction side thereof. The first lens group is constituted essentially by, in order from the magnification side to the reduction side, a front group having a positive refractive power and a rear group having a negative refractive power. Focusing operations are performed by changing the distance between the front group and the rear group. Conditional Formula (1): -0.3 5<=flb / ft<0 related to the focal length flb of the rear group and the focal length ft of the entire lens system at the telephoto end is satisfied.

Description

technical field [0001] The present invention relates to a zoom lens and an optical device, and more specifically, to a zoom lens suitable as a projection optical system used in a projection display device or an imaging optical system used in a digital camera, video camera, etc. And an optical device equipped with the zoom lens. Background technique [0002] Conventionally, cameras in the above-mentioned fields have used an imaging optical system that captures an image of a subject on the magnification side and forms an image on an imaging element on the reduction side. In addition, conventionally, in a projection display device, a projection optical system for projecting an optical image of light modulated by a modulation element disposed on the reduction side toward the enlargement side is used. In such a projection optical system and an imaging optical system, a zoom lens capable of realizing various focal lengths with a single optical system is mainly used. [0003] Amo...

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): G02B15/16
CPCG02B15/142G02B15/1465G02B27/646
Inventor 山本力
Owner FUJIFILM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap