Near infrared lens

A near-infrared and lens technology, applied in the field of near-infrared lenses, can solve the problems of non-conformance, complex lens structure, increased cost, etc., and achieve the effect of athermalization and excellent optical performance.

Active Publication Date: 2011-10-12
ZHEJIANG SUNNY OPTICAL CO LTD
View PDF9 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the most common lens in optical instruments, in order to achieve athermalization, generally start with the above three methods, but these methods make the lens structure more complicated, resulting in problems such as increased cost and larger lens volume, which are not suitable for portable lenses. requirement is not met

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
  • Near infrared lens
  • Near infrared lens
  • Near infrared lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0066] The focal length of each eyeglass of the near-infrared lens of embodiment 2 is as follows:

[0067] f1=-6.80; f2=23.53; f3=6.53; f4=8.47; f=2.27.

[0068] The near-infrared lens of Example 2 also adopts a glass-plastic mixed structure to overcome the heat dissipation difference. And the lens satisfies the following expression:

[0069] dn1 / dt=dn2 / dt=-1.022E-4, dn3 / dt=4.65E-6

[0070] Table 3 and Table 4 list the relevant parameters of the lenses in Example 2, including the surface type and radius of curvature of the lens surface, as well as the thickness, material, effective diameter and conic coefficient of each lens.

[0071] System parameters: 1 / 4″ photosensitive device aperture value 1.0

[0072] table 3

[0073] Surface number S

[0074] S12

[0075] Table 4 shows the aspheric high-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspheric lenses of Example 2.

[0076] Table 4

[0077] Face number

[0078] Figure 9 ...

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 near infrared lens, which comprises four groups of lenses along an optical axis from an object space to an image space, wherein a first lens is a falcate lens with negative power; the convex surface of the first lens faces to the object space and is a non-spherical surface; a second lens is a falcate lens with positive or negative power; the convex surface of the second lens faces to the image space; a third lens is a lenticular, convexo-plane or falcate lens with positive power; when the third lens is convexo-plane or falcate, the convex surface of the third lens faces to the object space; and a four lens is a lens with positive power and is a non-spherical surface. Due to the adoption of the design, the requirement of image quality is met under the condition of ensuring a large hole diameter and a large field coverage angle, and the technical effect of small distortion is achieved.

Description

technical field [0001] The invention relates to a near-infrared lens, in particular to a large-aperture, wide-angle, and small-distortion near-infrared lens composed of four groups of lenses. Background technique [0002] The optical lenses used in existing digital products generally adopt ordinary optical lenses, which have a small viewing angle and low image quality. This shortcoming can be overcome by using a wide-angle lens, but the biggest problem with an ordinary wide-angle lens is that the image of an object will be distorted after the optical action of the lens. In the past, there was only spherical glass. Or called barrel deformation, that is, the closer the image is to the edge, the more the image will expand and the straight line will bend into an arc). Eliminate this gap. Ordinary wide-angle lenses need 8 to 10 lenses when the lens angle of view is 80 degrees, and more than 10 to 12 lenses when the lens angle of view is above 100 degrees, resulting in too long ...

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): G02B13/18G02B13/06G02B13/14G02B13/00G02B1/00G02B1/04
Inventor 黄林戴付建
Owner ZHEJIANG SUNNY OPTICAL CO LTD
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