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Near infrared lens

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

Active Publication Date: 2013-04-10
ZHEJIANG SUNNY OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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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=-1.022×10 -4 , dn3 / dt=4.65×10 -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] Table 4 shows the aspheric high-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspheric lenses of Example 2.

[0075] Table 4

[0076] Face number

[0077] S10

[0078] ...

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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 the object will be distorted after the optical action of the lens. 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). It is necessary to install multiple crescent negative lenses or crescent positive lenses at the front of the lens to 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/18G02B13/06G02B13/14G02B13/00G02B1/00G02B1/04
Inventor 黄林戴付建
Owner ZHEJIANG SUNNY OPTICAL CO LTD
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