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Low-cost broad-spectrum optical system of day-night confocal trigger lens

An optical system and wide-spectrum technology, applied in the field of digital display, can solve the problems of low light intensity of visible light that cannot meet imaging requirements, inconsistent image plane position, poor imaging quality, etc., and achieve size reduction, control system chromatic aberration, and low cost Effect

Active Publication Date: 2012-11-14
NANYANG LIDA PHOTOELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in many surveillance situations, there is no visible light at night or the light intensity of visible light is too low to meet the imaging requirements, which requires near-infrared light to help imaging
Because the wavelength of near-infrared light is different from that of visible light, ordinary lenses are not optimized for imaging in the near-infrared band during design. Blurred imaging and poor imaging quality under infrared light conditions

Method used

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  • Low-cost broad-spectrum optical system of day-night confocal trigger lens
  • Low-cost broad-spectrum optical system of day-night confocal trigger lens
  • Low-cost broad-spectrum optical system of day-night confocal trigger lens

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Experimental program
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Embodiment Construction

[0037] combine figure 1 , the low-cost wide-spectrum day and night confocal trigger lens optical system is in order from the object side to the image side along the optical axis: the first lens L1 with positive power, the second lens L2 with negative power, and the lens with positive power The third lens L3, the fourth lens L4 with positive refractive power, and the optical low-pass filter (OLPF) L5 adopt a structure of four spherical lenses and one OLPF.

[0038] The first lens L1 is a meniscus lens convex to the object side, with positive refractive power, made of barium flint glass,

[0039] Its focal length f1, material refractive index Nd1, and material Abbe constant Vd1 satisfy:

[0040] f1>10mm, 1.6

[0041] The second lens L2 is a double-concave lens with a negative power, made of heavy flint glass, and has a focal length of f2,

[0042] The refractive index Nd2 of the material and the Abbe constant Vd2 of the material satisfy:

[004...

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Abstract

The invention relates to a low-cost broad-spectrum optical system of a day-night confocal trigger lens. The optical system is composed of a positive power first lens L1, a negative power second lens L2, a positive power third lens L3, a positive power fourth lens L4 and an optical low pass filter (OLPF) L5, wherein L1, L2, L3, L4 and L5 are sequentially distributed from the object to be shot to an image plane side along an optical axis, and the objects to be shot different in distance can be integrally moved through the lens to achieve clear imaging on the image plane portion. The optical system has the advantages of being capable of enabling visible wave band and near-infrared band to image clearly and simultaneously and being low in cost and suitable for batch production, and the lenses are all spherical lenses and made of common crown glass or flint glass.

Description

technical field [0001] The invention belongs to the technical field of digital display, in particular to a low-cost wide-spectrum day and night confocal trigger lens optical system. Background technique [0002] In recent years, with the rapid integration of photographic optics and digital technology, the combination of photoelectric technology has also promoted the rapid development of photographic equipment, the rapid development of micro-processing technology in the electronics industry, the high speed of CPU and the high integration of storage media, making it Can handle larger capacity image information. At the same time, as the CCD of the photosensitive element, CMOS has also achieved smaller size, higher integration, and higher spatial frequency. These are all conducive to the miniaturization of the lens. [0003] With the development of society, people's awareness of safety precautions has been continuously improved, and night monitoring has gradually been valued b...

Claims

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Application Information

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IPC IPC(8): G02B13/14G02B13/00G02B1/00
Inventor 赵武李智超何春生董站岗赵伦
Owner NANYANG LIDA PHOTOELECTRIC
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