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Large-view-field hemispherical airspace fisheye lens system

An airspace fish and eye lens technology, applied in optical components, optics, instruments, etc., can solve the problem of loss of real-time information and achieve an effect that is beneficial to processing

Pending Publication Date: 2021-12-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic and foreign technologies to expand the range of human field of view are mainly rotary / step scanning technology, multi-lens stitching technology, and ultra-wide-angle staring technology. The main disadvantage of the first two technologies is the loss of real-time information acquisition, while ultra-wide-angle Staring technology can meet the functions of full airspace inclusion and real-time information acquisition in all time domains. The fisheye lens belongs to this type of ultra-wide-angle lens, and its field of view can reach or exceed the range of 180°, which is especially in line with the needs of modern warfare for information acquisition. Countries are competing to develop advanced technologies, so fisheye lenses have been widely used in national defense and military fields. Fisheye lenses have also been widely used in photography, dome projection, weather monitoring, security monitoring, engineering measurement, and tiny intelligent systems. Applications

Method used

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  • Large-view-field hemispherical airspace fisheye lens system
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  • Large-view-field hemispherical airspace fisheye lens system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, see figure 1 , a large field of view hemispherical space fisheye lens system, along the direction of the optical axis, from the object side to the image side, sequentially includes a front lens group with negative refractive power and a rear lens group with positive refractive power;

[0027] The front lens group sequentially includes a first lens (1) with negative refractive power, a second lens (2) with negative refractive power, and a second lens (2) with negative refractive power in the direction of the optical axis from the object side to the image side. Three lenses (3), a fourth lens (4) with negative power and a fifth lens (5) with positive power;

[0028] The rear lens group sequentially includes a sixth lens (6) with positive refractive power, a seventh lens (7) with positive refractive power, and an eighth lens with negative refractive power in the direction of the optical axis from the object side to the image side Lens (8), aperture stop (...

Embodiment 2

[0031] This embodiment is basically the same as Embodiment 1, especially in that:

[0032] In this embodiment, the seventh lens (7) and the eighth lens (8) are combined into a doublet lens by cementing.

[0033] In this embodiment, the ninth lens (9) and the tenth lens (10) are combined into a doublet lens by cementing.

[0034] In this embodiment, the eleventh lens (11) and the twelfth lens (12) are combined into a doublet lens by cementing.

[0035] In this embodiment, the field angle of the lens of the system is 180°±5°, the total focal length is 6.740mm±0.1mm, the F number is 2.8±0.05, the total length is 210.36mm±5mm, and the detectable wavelength range It is 486-656nm, and the dominant wavelength is 588nm±10nm.

[0036] In this embodiment, the fisheye lens system with large field of view and hemispheric space balances the aberration of the front lens group and the aberration of the rear lens group as much as possible, so that the imaging quality meets the requirements....

Embodiment 3

[0038] This embodiment is basically the same as the above-mentioned embodiment, and the special features are:

[0039] In this embodiment, the lens of the system has an angle of view of 180°, a total focal length of 6.740 mm, an F number of 2.±0.05, a total length of 210.36 mm, a detectable wavelength range of 486-656 nm, and a dominant wavelength 588nm.

[0040] The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the first lens The materials of the nine lenses 9, the tenth lens 10, the eleventh lens 11 and the twelfth lens 12 are respectively H-K9L, H-K9L, H-K9L, H-ZK9B, ZF4, ZF1, H- KF6, H-ZBAF52, H-K10, H-ZLAF52, H-ZF3, H-K9L.

[0041] The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the first lens The refractive indices n of the nine lenses 9, the tenth lens 10, the eleventh l...

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Abstract

The invention discloses a large-view-field hemispherical airspace fisheye lens system and belongs to the technical field of optics. The large-view-field hemispherical airspace fisheye lens system comprises a front lens group with negative focal power and a rear lens group with positive focal power in sequence from an object side to an image side along the direction of an optical axis; the front lens group sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power and a fifth lens with positive focal power from the object space to the image space in the direction of the optical axis; and the rear lens group sequentially comprises a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, an aperture diaphragm, a ninth lens with positive focal power, a tenth lens with negative focal power, an eleventh lens with negative focal power and a twelfth lens with positive focal power from the object space to the image space in the direction of the optical axis. The imaging quality can meet the requirements through a mode that the aberration of the front lens group and the aberration of the rear lens group are mutually balanced.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a large field of view hemispherical space fisheye lens system. Background technique [0002] Fisheye lens is a kind of bionic system that imitates the eyes of underwater fish to look up at the hemispherical airspace above the water surface. By designing this function of fisheye into the form of optical instruments, it becomes a fisheye lens, which can satisfy people as much as possible. The purpose of obtaining information from a large field of view. It is generally considered that a lens with a field of view exceeding 140° is considered a fisheye lens. At present, domestic and foreign technologies to expand the range of human field of view are mainly rotary / step scanning technology, multi-lens stitching technology, and ultra-wide-angle staring technology. The main disadvantage of the first two technologies is the loss of real-time information acquisition, while ultra-wi...

Claims

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Application Information

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IPC IPC(8): G02B13/06G02B1/00
CPCG02B13/06G02B1/00
Inventor 侯国柱吕丽军
Owner SHANGHAI UNIV
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