Large-view-field long-rear-intercept zoom system with rear group focusing and optical zoom lens

A zoom system and back intercept technology, applied in optics, optical components, instruments, etc., can solve problems such as large aperture and weight, overall length change, field of view and back intercept limitation, etc., to reduce focusing structural parts and drive Structure, ease of assembly, effect of improving imaging performance

Pending Publication Date: 2020-06-23
湖南谱峰光电有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The focusing structure in the traditional zoom system is generally realized by moving the front fixed focal length lens group. The front fixed focal length lens group has relatively large caliber and weight, and the overall length will change accordingly. There will be certain problems in application. There will be certain limitations on the back intercept

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
  • Large-view-field long-rear-intercept zoom system with rear group focusing and optical zoom lens
  • Large-view-field long-rear-intercept zoom system with rear group focusing and optical zoom lens
  • Large-view-field long-rear-intercept zoom system with rear group focusing and optical zoom lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as Figure 1 to Figure 3 The large field of view and long rear focus zoom system shown in the rear group focus includes the first lens group 1, the second lens group 2, and the third lens group arranged in sequence from left to right and in the same optical axis direction 3. Diaphragm 6, fourth lens group 4 and full target surface 5; wherein, the first lens group 1, the third lens group 3 and the fourth lens group 4 all have positive refractive power, and the second lens Group 2 has a negative refractive power, the fourth lens group 4 includes a focusing group 42 with positive refractive power, the first lens group 1 and the fourth lens group 4 are fixed fixed focal length lens groups, and the The second lens group 2 and the third lens group 3 are variable focal length lens groups that can move along the optical axis direction. Moving further achieves the purpose of zooming; by moving the second lens group 2 and the third lens group 3 to change the distance betwee...

Embodiment 2

[0065] Such as Figure 1 to Figure 3 Another large-field-of-view and long-focus zoom system shown in the rear group includes the first lens group 1, the second lens group 2, and the third lens that are arranged in sequence from left to right and in the same optical axis direction Group 3, diaphragm 6, fourth lens group 4 and full target surface 5; wherein, the first lens group 1, the third lens group 3 and the fourth lens group 4 all have positive refractive power, and the second The lens group 2 has a negative refractive power, the fourth lens group 4 includes a focusing group 42 with a positive refractive power, and the first lens group 1 and the fourth lens group 4 are fixed fixed focal length lens groups, so The second lens group 2 and the third lens group 3 are variable focal length lens groups that can move along the optical axis direction, and are installed on mechanical devices such as space cams in the lens barrel to realize the second lens group 2 and the third lens ...

Embodiment 3

[0071] Such as Figure 1 to Figure 3Another large-field-of-view and long-focus zoom system shown in the rear group includes a first lens group 1, a second lens group 2, and a third lens set in sequence from left to right and in the same optical axis direction Group 3, diaphragm 6, fourth lens group 4 and full target surface 5; wherein, the first lens group 1, the third lens group 3 and the fourth lens group 4 all have positive refractive power, and the second The lens group 2 has a negative refractive power, the fourth lens group 4 includes a focusing group 42 with a positive refractive power, and the first lens group 1 and the fourth lens group 4 are fixed fixed focal length lens groups, so The second lens group 2 and the third lens group 3 are variable focal length lens groups that can move along the optical axis direction, and are installed on mechanical devices such as space cams in the lens barrel to realize the second lens group 2 and the third lens group 3 The movement...

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

The invention discloses a large-view-field long-rear-intercept zoom system with rear group focusing and an optical zoom lens. The large-view-field long-rear-intercept zoom system comprises a first lens group, a second lens group, a third lens group, a diaphragm device, a fourth lens group and a full target surface, wherein the first lens group, the third lens group and the fourth lens group all have positive focal power, the second lens group has negative focal power, and the fourth lens group comprises a focusing group with positive focal power; zooming is performed by moving the second lensgroup and the third lens group to change the interval of each lens group; and the position change of the image plane is corrected by moving the focusing group under the condition of different object distances. According to the invention, zooming is carried out by changing the interval of each lens group; the position change of the image surface is corrected by moving the focusing group; focusing of the zoom system can be realized by selecting a single lens as the focusing group, focusing structural parts and driving structures are reduced, the cost of the system is greatly reduced, and the practicability is high; miniaturization, large view field and long back intercept zooming process are realized through movement of the two variable focal length lens groups according to a certain mode.

Description

technical field [0001] The invention relates to the technical field of monitoring devices, in particular to a large field of view and long back focus zoom system with rear group focusing and an optical zoom lens. Background technique [0002] Imaging systems are widely used in military and civilian fields. In some imaging systems, such as reconnaissance systems and ground remote sensing systems, in order to complete target capture and tracking, it is necessary to integrate a zoom system in the system to obtain clear images of targets at different object distances and different fields of view; The tracking target will be lost, and the appropriate size of the field of view can be selected according to the target characteristics, which greatly improves the tracking and monitoring effects. [0003] The traditional zoom system is only composed of one or more fixed focal length lens groups and one or more variable focal length lens groups. Mechanical devices such as space cams ar...

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): G02B15/173
CPCG02B15/173
Inventor 路晓伟王晓峰李金侠
Owner 湖南谱峰光电有限公司
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