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

High variable power zoom lens

A variable focus lens, variable technology, applied in the direction of optical components, optics, instruments, etc., can solve the problems of reduced productivity, unfavorable zoom lens focus, obstruction, etc.

Active Publication Date: 2010-02-10
TAMRON
View PDF2 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the variable magnification of the zoom lens is increased to 13 times, in some cases, it will disadvantageously cause the zoom lens to focus at the changed focal length, thereby reducing the magnification of the third lens group to as low as -1 times
In addition, the third lens group becomes more sensitive to aberrations, and dealing with this hinders and reduces productivity

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
  • High variable power zoom lens
  • High variable power zoom lens
  • High variable power zoom lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0094] Preferred embodiments of the high variable magnification zoom lens according to the present invention will be described below.

[0095] Focal length f=18.40~71.10~264.21mm

[0096] Fno=3.50~5.24~6.32

[0097] 2ω=76.5~23.1~6.3°

[0098] Number R D Nd vd

[0099] 1 94.3524 1.5000 1.84666 23.78

[0100] 2 66.4807 8.0000 1.49700 81.61

[0101] 3 -1326.8193 0.2000 1.00000

[0102] 4 72.3127 4.5000 1.61800 63.39

[0103] 5 180.4067 D5 1.00000

[0104] 6 90.3327 0.2000 1.51460 49.96

[0105] 7 83.8997 1.2000 1.80400 46.58

[0106] 8 14.845 6.4000 1.00000

[0107] 9 -34.8049 1.0000 1.80400 46.58

[0108] 10 47.2288 0.8000 1.00000

[0109] 11 34.7194 4.8000 1.84666 23.78

[0110] 12 -33.6597 1.2000 1.00000

[0111] 13 -25.046 1.0000 1.88300 40.78

[0112] 14 -207.5416 D14 1.00000

[0113] 15 0.0000 1.0000 1.00000

[0114] 16 37.3663 1.0000 1.84666 23.78

[0115] 17 26.4946 4.0000 1.48749 70.21

[0116] 18 -1075.5953 0.2000 1.00000

[0117] 19 32.6392 3.2918 1....

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 compact and lightweight, high variable power zoom lens especially suitable for single-lens reflex digital cameras, which is 75 degrees or even wider in field angle at the wide-angle end, approximately 3 to 4 in F-number at the wide-angle end and approximately 6 to 7 at the telephoto end, and about 15x in variable power ratio. The zoom lens of four groups of lens pieces respectively exerting positive, negative, positive, and positive refractivities varies the power from the wide-angle end to the telephoto end as a result of the 1st and 2nd lens groups being split more, the 2nd and 3rd lens groups coming closer to each other, and the 3rd and 4th lens groups also coming closer to each other. The 3rd lens group has the leading set of lens pieces of positive refractivity closer to objects andthe trailing set of lens pieces of negative refractivity, and the trailing set alone are moved to be orthogonal to the optical axis to compensate for defocus in the imaging plane caused by a tremor of the user's hand(s). The 2nd lens group are displaced closer to objects for the focusing.

Description

technical field [0001] The present invention relates to a high variable power zoom lens suitable for a single-lens reflex camera, and more particularly, to a compact and lightweight high variable power zoom lens capable of Sufficient back focal length (back focal length), suitable for single-lens reflex cameras, and has advantages in incorporating an optical stabilizer or anti-shake mechanism, the zoom lens has an angle of view of 75 degrees or wider at the wide-angle end, and has an angle of view at the wide-angle end The F-number at the telephoto end is about 3 to 4, and the F-number at the telephoto end is about 6 to 7, and the zoom ratio is about 15 times. Background technique [0002] Recently, rapid advances in optical design technology and optical manufacturing technology have made zoom lenses smaller in size and improved in variable magnification. For example, one type of zoom lens in the prior art has a design that increases the variable magnification and can incor...

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
IPC IPC(8): G02B15/16
Inventor 荒川明男村松雄一
Owner TAMRON
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