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Day-night confocal optical lens and imaging equipment

An optical lens, confocal technology, applied in optics, optical components, image communication, etc., can solve the problems of high cost of imaging equipment, blurred imaging, inconsistent image plane position, etc., to achieve excellent imaging performance, low cost, and fewer lenses. Effect

Pending Publication Date: 2020-02-25
江苏林兴光学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working spectrum of the imaging system is the visible spectrum during the day, and the near-infrared spectrum at night; usually, due to the change of the refractive index with the wavelength, the image plane positions of the visible light band and the near-infrared band are inconsistent, resulting in blurred imaging. Therefore, the day and night confocal imaging equipment requires that the optical lens matched with it can clearly image in the visible spectrum and the near-infrared spectrum. The infrared band is optimized at the same time. For the existing day and night confocal imaging equipment, most of the existing technologies contain multiple aspheric lenses, resulting in high cost of imaging equipment

Method used

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  • Day-night confocal optical lens and imaging equipment
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  • Day-night confocal optical lens and imaging equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0047] see Figure 1~5, in Embodiment 1 of the present invention, a day and night confocal optical lens, comprising a first lens group G1 with positive refractive power, an aperture stop ST, and a lens group with negative refractive power arranged in sequence along the optical axis from the object plane to the image plane The second lens group G2, the third lens group G3 with positive refractive power, the third lens group G3 moves along the optical axis during the focusing process, and the day and night confocal optical lens satisfies the following conditional formula:

[0048] 33≤F 1 *F 3 / F 2 ≤61 (1);

[0049] 4.512 / F≤20 (2);

[0050] where F 1 , F 2 and F 3 represent the focal lengths of the first lens group G1, the second lens group G2 and the third lens group G3 respectively, F represents the focal length of the day and night confocal optical lens 1, F 12 represents the combined focal length of the first lens group G1 and the second lens group G2.

[0051] Spec...

Embodiment 2

[0071] Figure 6 It is a sectional view along the optical axis showing the day and night confocal optical lens of Example 2. The optical lens is composed of the following lens groups arranged sequentially from the object side shown in the figure: the first lens group G1 with positive refractive power; the second lens group G2 with negative refractive power; the second lens group G2 with positive refractive power Three-lens group G3. In addition, an aperture stop ST having a predetermined aperture is disposed between the first lens group G1 and the second lens group G2.

[0072] The first lens group G1 is configured such that a positive lens L1, a second positive lens L2, and a negative lens L3 are arranged in this order from the object side. In addition, the first lens group G1 and the second lens group G2 are fixed and do not move during focusing, and the third lens group G3 moves from the imaging plane IMG to the object side along the optical axis to achieve a focus state ...

Embodiment 3

[0082] Figure 10 It is a sectional view along the optical axis showing the day and night confocal optical lens of Example 3. The optical lens is composed of the following lens groups arranged sequentially from the object side shown in the figure: the first lens group G1 with positive refractive power; the second lens group G2 with negative refractive power; the second lens group G2 with positive refractive power Three-lens group G3. In addition, an aperture stop ST having a predetermined aperture is disposed between the first lens group G1 and the second lens group G2.

[0083] The first lens group G1 is configured such that a positive lens L1, a second positive lens L2, and a negative lens L3 are arranged in this order from the object side. In addition, the first lens group G1 and the second lens group G2 are fixed and do not move during focusing, and the third lens group G3 moves from the imaging plane IMG to the object side along the optical axis to achieve a focus state...

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Abstract

The invention discloses a day-night confocal optical lens and imaging equipment. The day-night confocal optical lens comprises a first lens group with positive focal power, an aperture diaphragm, a second lens group with negative focal power and a third lens group with positive focal power which are sequentially arranged along an optical axis from an object plane to an image plane. The third lensgroup moves along the optical axis in a focusing process, the day-night confocal optical lens satisfies the following conditional expressions that F1*F3 / F2 is larger than or equal to 33 and smaller than or equal to 61, F12 / F is larger than or equal to 4.5 and smaller than or equal to 20, wherein F1, F2 and F3 represent the focal lengths of the first lens group, the second lens group and the thirdlens group respectively, F represents the focal length of the day-night confocal optical lens, and F12 represents the synthetic focal length of the first lens group and the second lens group. The invention has the advantages that the day-night confocal optical lens can achieve clear imaging under a visible spectrum and a near infrared spectrum, both the day-night confocal optical lens and the imaging equipment have excellent imaging performance, the number of contained lenses is small, and the cost is low.

Description

technical field [0001] The invention relates to the field of imaging equipment, in particular to a day and night confocal optical lens and imaging equipment. Background technique [0002] With the construction of the safety project, people's awareness of safety precautions has been continuously improved, and people have gradually paid attention to nighttime monitoring. Day and night confocal imaging equipment refers to an imaging system that can image clearly during the day and night. The working spectrum of the imaging system is the visible spectrum during the day, and the near-infrared spectrum at night; usually, due to the change of the refractive index with the wavelength, the image plane positions of the visible light band and the near-infrared band are inconsistent, resulting in blurred imaging. Therefore, the day and night confocal imaging equipment requires that the matching optical lens can clearly image in the visible spectrum and the near-infrared spectrum. The i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/173G02B13/14H04N5/225
CPCG02B15/173G02B13/14H04N23/55
Inventor 张国林
Owner 江苏林兴光学有限公司