CN113960756B

CN113960756B - Fish-eye lens

Info

Publication number: CN113960756B
Application number: CN202111280758.1A
Authority: CN
Inventors: 张冰锐; 金腾; 张振; 张巨涛; 陶玉
Original assignee: Tianjin Jinhang Institute of Technical Physics
Current assignee: Tianjin Jinhang Institute of Technical Physics
Priority date: 2021-11-01
Filing date: 2021-11-01
Publication date: 2023-07-21
Anticipated expiration: 2041-11-01
Also published as: CN113960756A

Abstract

The application provides a fisheye lens, including 10 optical glass lens lenses of different specifications, adopt the form of anti-long-range, the operating band scope is widened to 450nm ~ 1000nm, under the condition of deciding F number 1.8, cooperate low-illuminance CMOS detector, the diagonal visual field can reach 210, the image is about 24mm to the angular line size, and the F-theta distortion is less than 5% in the 180 visual field, can satisfy 45 lp/mm's spatial resolution's operation requirement in-40 °to +80 DEG temperature range, can realize imaging under the condition of 0.001Lux, satisfy the operation of condition round clock, compare the fisheye lens of equal visual field, have the wave band wide, the light ring is big, the image plane is big characteristics.

Description

Fish-eye lens

Technical Field

The invention belongs to the technical field of optical systems, and particularly relates to a wide-image-plane broadband fisheye lens.

Background

The fisheye lens is a special optical lens, and can enable scenes close to or exceeding the hemispherical space to be imaged on an image plane by introducing a large amount of negative distortion, the field angle of the fisheye lens can be generally more than 180 degrees, and the fisheye lens can acquire scene information in a large range and can be applied to the fields of security monitoring, vehicle-mounted panoramic auxiliary driving and the like. The working wave band range of the existing fisheye lens is mostly 450nm-650nm, the F number is usually 2-2.8, the size of an image surface angle line is usually smaller than 15mm, the working wave band range is small, and the image surface is smaller.

Disclosure of Invention

In view of the above-mentioned defects or shortcomings in the prior art, the application aims to provide a fisheye lens, which is composed of 10 optical glass lenses with different specifications in a reverse distance mode, and has the characteristics of wide wave band, large aperture and large image plane compared with the fisheye lens with the same view field.

The application provides a fish-eye lens, which consists of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and a detector assembly from outside to inside in sequence; the first lens is a meniscus negative lens protruding towards the object, the second lens is a biconcave lens, the third lens is a biconvex lens, the fourth lens is a meniscus positive lens protruding towards the image, the fifth lens is a biconvex lens, the sixth lens is a biconvex lens, the seventh lens is a biconcave lens, the eighth lens is a biconvex lens, the ninth lens is a biconvex lens, and the tenth lens is a meniscus negative lens protruding towards the image; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are all optical glass lenses.

Further, the mirror radius of the first lens is 56-57 mm relatively close to the object side, and the mirror radius of the first lens is 15-16 mm relatively far away from the object side; the mirror radius of the second lens is 129-130 mm relatively close to the object space, and the mirror radius of the second lens relatively far away from the object space is 12-13 mm; the third lens has a mirror radius of 34-35 mm relatively close to the object space and a mirror radius of 60-61 mm relatively far away from the object space; the mirror radius of the fourth lens is 17-18 mm relatively close to the object side, and the mirror radius of the fourth lens relatively far away from the object side is 19.57mm; the mirror radius of the fifth lens is 17-18 mm relatively close to the object space, and the mirror radius of the fifth lens is 38-39 mm relatively far away from the object space; the radius of the mirror surface of the sixth lens relatively close to the object space is 15-16 mm, and the radius of the mirror surface relatively far away from the object space is 10-11 mm; the mirror radius of the seventh lens is 10-11 mm relatively close to the object space, and the mirror radius of the seventh lens relatively far away from the object space is 17-18 mm; the mirror radius of the eighth lens is 164-165 mm relatively close to the object space, and the mirror radius of the eighth lens relatively far away from the object space is 30-31 mm; the mirror radius of the ninth lens is 42-43 mm relatively close to the object side, and the mirror radius of the ninth lens is 19-20 mm relatively far away from the object side; the mirror radius of the tenth lens is 11-12 mm relatively close to the object side, and the mirror radius of the tenth lens is 29-30 mm relatively far away from the object side.

Further, the aperture of the first lens is respectively that the mirror surface relatively close to the object side and the mirror surface relatively far away from the object sideAnd->The aperture of the second lens is +.>And-> The aperture of the third lens is +.>The aperture of the fourth lens is +.>And->The aperture of the fifth lens is +.>And-> The aperture of the sixth lens is respectively that the mirror surface relatively close to the object space and the mirror surface relatively far away from the object spaceAnd->The aperture of the seventh lens is +.>And->The aperture of the eighth lens is +.>And->The aperture of the ninth lens is +.>And->The aperture of the tenth lens is +.>And

further, the thickness of the first lens is 4.5-4.6 mm; the thickness of the second lens is 2.5-2.6 mm; the thickness of the third lens is 4.2-4.3 mm; the thickness of the fourth lens is 6.7-6.8 mm; the thickness of the fifth lens is 9.7-9.8 mm; the thickness of the sixth lens is 3.5-3.6 mm; the thickness of the seventh lens is 1.4-1.5 mm; the thickness of the eighth lens is 2.7-2.8 mm; the thickness of the ninth lens is 4.1-4.2 mm; the thickness of the tenth lens is 1.5-1.6 mm.

Further, the distance between the first lens and the second lens is 11.9-12 mm; the distance between the second lens and the third lens is 4.5-4.6 mm; the distance between the third lens and the fourth lens is 2.9-3 mm; the distance between the fourth lens and the fifth lens is 0.2-0.3 mm; the distance between the fifth lens and the sixth lens is 0.5-0.6 mm; the distance between the seventh lens and the eighth lens is 1.1-1.2 mm; the distance between the eighth lens and the ninth lens is 0.1-0.2 mm; the distance between the ninth lens and the tenth lens is 2.3-2.4 mm.

Further, the sixth lens and the seventh lens constitute a cemented lens.

Further, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, and the mirror surface relatively close to the object side and the mirror surface relatively far from the object side are spherical surfaces.

Further, the detector assembly is a CMOS low-light detector.

Further, the optical glass mark of the first lens is LAF10LA; the optical glass mark of the second lens is HLAK5A; the third-transmission optical glass has a lens mark of HZLAF56B; the optical glass mark of the fourth lens is HZK9B; the optical glass mark of the fifth lens is HLAK59A; the optical glass brand of the sixth lens is HFK61; the optical glass mark of the seventh lens is HZF6; the optical glass mark of the eighth lens is HLAK53B; the optical glass mark of the ninth lens is HLAK5A; the optical glass of the tenth lens is HZF6.

Compared with the prior art, the fish-eye lens has the beneficial effects that: through 10 optical glass lens lenses with different specifications, the working wave band range is widened to 450-1000 nm by adopting inverse long-distance form combination, under the condition of a fixed F number of 1.8, the diagonal view field can reach 210 degrees, the size of an image facing angle line is about 24mm, F-theta distortion is less than 5 percent within the 180-degree view field, the working requirement within the temperature range of-40 degrees to +80 degrees is met, and the low-illumination CMOS detector is matched, so that the working under the day and night condition can be met, and compared with the fisheye lens with the same view field, the fisheye lens has the characteristics of wide wave band, large aperture and large image surface.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings.

Fig. 1 is a schematic structural diagram of an embodiment of a fisheye lens.

Fig. 2 and 3 are graphs of optical transfer function values at +20℃.

Fig. 4 and 5 are graphs of optical transfer function values at-40 c for the fisheye lens of the embodiment.

Fig. 6 and 7 are graphs of optical transfer function values at +80℃.

Fig. 8 is a distortion curve of the fisheye lens of the embodiment.

In the figure: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a sixth lens; 7. a seventh lens; 8. an eighth lens; 9. a ninth lens; 10. a tenth lens; 11. a detector assembly.

Detailed Description

The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. In addition, for convenience of description, only the part related to the invention is shown in the drawings, and the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

A preferred embodiment of the present invention will be further described with reference to the accompanying drawings, as shown in fig. 1, a fisheye lens, which includes, in order from an object side to an image side, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, and a detector assembly 11; the first lens 1 is a meniscus negative lens convex to an object, the second lens 2 is a biconcave lens, the third lens 3 is a biconvex lens, the fourth lens 4 is a meniscus positive lens convex to an image, the fifth lens 5 is a biconvex lens, the sixth lens 6 is a biconvex lens, the seventh lens 7 is a biconcave lens, the eighth lens 8 is a biconvex lens, the ninth lens 9 is a biconvex lens, and the tenth lens 10 is a meniscus negative lens convex to the image; 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 ninth lens 9, and the tenth lens 10 are all optical glass lenses. Specifically, the design is performed in a reverse remote mode.

Optimally, the mirror radius of the first lens 1 is 56.977mm relatively close to the object side, and the mirror radius of the first lens 1 is 15.32mm relatively far away from the object side; the mirror radius of the second lens 2 is 129.9mm relatively close to the object side, and the mirror radius of the second lens 2 is 12.273mm relatively far away from the object side; the mirror radius of the third lens 3 is 34.27mm relatively close to the object side, and the mirror radius of the third lens 3 is 60.28mm relatively far away from the object side; the mirror radius of the fourth lens 4 is 17.83mm relatively close to the object side, and the mirror radius of the fourth lens 4 is 19.57mm relatively far away from the object side; the mirror radius of the fifth lens 5 is 17.65mm relatively close to the object side, and the mirror radius of the fifth lens 5 is 38.73mm relatively far away from the object side; the mirror radius of the sixth lens 6 is 15.74mm relatively close to the object side, and the mirror radius of the sixth lens 6 is 10.069mm relatively far away from the object side; the seventh lens 7 has a mirror radius of 10.069mm relatively close to the object side and a mirror radius of 17.55mm relatively far from the object side; the mirror radius of the eighth lens 8 is 164.23mm relatively close to the object side and 30.2mm relatively far away from the object side; the mirror radius of the ninth lens 9 is 42.24mm relatively close to the object side, and the mirror radius of the ninth lens 9 is 19.57mm relatively far away from the object side; the tenth lens 10 has a mirror radius of 11.34mm relatively close to the object side and a mirror radius of 29.05mm relatively far from the object side.

Optimally, the aperture of the first lens 1 is respectively that of the mirror surface relatively close to the object side and the aperture of the mirror surface relatively far away from the object sideAnd->The aperture of the second lens 2 is +.>And->The aperture of the third lens 3 is +.>And->The aperture of the fourth lens 4 is +.>And->The aperture of the fifth lens 5 is +.>And->The aperture of the sixth lens 6 is +.>Andthe aperture of the seventh lens 7 is respectively that of the mirror surface relatively close to the object side and the mirror surface relatively far away from the object sideAnd->The aperture of the eighth lens 8 is +.>And->The aperture of the ninth lens 9 is +.>And->The tenth lens 10 has a mirror surface relatively close to the object side and a mirror surface relatively far from the object side with light apertures of +.>And->

Preferably, the thickness of the first lens 1 is 4.5mm; the thickness of the second lens 2 is 2.5mm; the thickness of the third lens 3 is 4.25mm; the thickness of the fourth lens 4 is 6.72mm; the thickness of the fifth lens 5 is 9.7mm; the thickness of the sixth lens 6 is 3.52mm; the thickness of the seventh lens 7 is 1.5mm; the thickness of the eighth lens 8 is 2.8mm; the thickness of the ninth lens 9 is 4.14mm; the tenth lens 10 has a thickness of 1.58mm.

Preferably, the distance between the first lens 1 and the second lens 2 is 11.9mm; the distance between the second lens 2 and the third lens 3 is 4.55mm; the distance between the third lens 3 and the fourth lens 4 is 2.92mm; a distance between the fourth lens 4 and the fifth lens 5 is 0.21mm; a distance between the fifth lens 5 and the sixth lens 6 is 0.57mm; a distance between the seventh lens 7 and the eighth lens 8 is 1.17mm; a distance between the eighth lens 8 and the ninth lens 9 is 0.1mm; the distance between the ninth lens 9 and the tenth lens 10 is 2.33mm. Specifically, an optical passive athermalization design is adopted within a design temperature range of-40 ℃ to +80 ℃, and the temperature coefficient matching of refractive indexes of different optical glass lenses is combined with the expansion and contraction of an optical machine structure to realize the stable image plane position in a full temperature zone without a focusing mechanism.

Preferably, the sixth lens 6 and the seventh lens 7 form a cemented lens.

Preferably, 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 ninth lens 9, and the tenth lens 10 are spherical surfaces.

Preferably, the detector assembly 11 is a CMOS low-light detector. Specifically, the target surface of the detector component 11 is 21.12mm multiplied by 11.88mm, the resolution is 1920 multiplied by 1080, the pixel size is 11 μm, and the light source can be acquired at night, so that better imaging quality is obtained.

Optimally, the optical glass brand of the first lens 1 is LAF10LA; the optical glass mark of the second lens 2 is HLAK5A; the optical glass of the third lens 3 is of the brand HZLAF56B; the optical glass mark of the fourth lens 4 is HZK9B; the optical glass mark of the fifth lens 5 is HLAK59A; the optical glass of the sixth lens 6 is provided with a lens mark HFK61; the optical glass of the seventh lens 7 is HZF6; the optical glass mark of the eighth lens 8 is HLAK53B; the optical glass mark of the ninth lens 9 is HLAK5A; the optical glass of the tenth lens 10 is HZF6.

In this embodiment, the F-number of the optical lens is 1.8 and the focal length is 6.8mm. Table 1 shows the imaging quality of the fisheye lens of the embodiment under different environmental temperatures (MTF@45 lp/mm), and the imaging quality in the field of view is good due to the fact that the design of optical passive athermalization is realized in the temperature range of-40 ℃ to +80 ℃.

TABLE 1

Fig. 2 to 7 are diagrams of optical transfer function values of the optical lens according to the preferred embodiments manufactured by the Code V optical design software at +20 ℃, -40 ℃ and +80 ℃ respectively, the design inputs are wavelengths of 450nm, 500nm, 550nm, 600nm, 650nm, 700nm, 750nm, 800nm, 850nm, 900nm and 1000nm, half fields of view are 0 °, 30 °, 50 °, 70 °, 90 ° and 105 °, and F-numbers are 1.8. Since the image quality of the positive and negative fields of view in the sagittal plane is the same, the positive field of view may be taken only when input. In the figure, the abscissa indicates spatial frequency, and the ordinate indicates an optical transfer function value. It can be seen that the MTF@45lp/mm is greater than 0.4 within 50 degrees of half field angle at normal temperature, the maximum field MTF@45lp/mm is greater than 0.1, and the MTF is greater than 0.4 at half Nyquist frequency (23 lp/mm). The half view field of the lens is within 100 degrees, the imaging quality is good, and the marginal view field also has higher resolution capability.

Fig. 8 is an F- θ distortion curve of the fisheye lens according to the present embodiment using Code V optical design software. From the figure, it can be seen that the lens has small F-theta distortion, F-theta distortion is less than 1.2% in half field of view 90 DEG, F-theta distortion is less than 5% in the maximum field of view, and distortion is easily corrected by image processing.

In summary, the working band range is widened to 450-1000 nm by combining 10 optical glass lens lenses with different specifications in a reverse remote mode, under the condition of a fixed F number of 1.8, a target surface of 21.12mm multiplied by 11.88mm, a resolution of 1920 multiplied by 1080 and a pixel size of 11 mu m are matched with a low-illumination CMOS detector, a diagonal view field can reach 210 degrees, an image surface has an angular line size of about 24mm, F-theta distortion is less than 5% within a 180-degree view field, the working requirement of spatial resolution of 45lp/mm can be met within a temperature range of-40 DEG to +80 DEG, imaging under the condition of 0.001Lux can be realized, the day and night condition work is met, and compared with a fisheye lens with the same view field, the fisheye lens has the characteristics of wide band, large aperture and large image surface.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

1. The utility model provides a fish-eye lens which characterized in that: the lens system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and a detector assembly in sequence from an object side to an image side along the direction of an optical axis; the first lens is a meniscus negative lens protruding towards the object, the second lens is a biconcave lens, the third lens is a biconvex lens, the fourth lens is a meniscus positive lens protruding towards the image, the fifth lens is a biconvex lens, the sixth lens is a biconvex lens, the seventh lens is a biconcave lens, the eighth lens is a biconvex lens, the ninth lens is a biconvex lens, and the tenth lens is a meniscus negative lens protruding towards the image;

the mirror radius of the first lens is 56-57 mm relatively close to the object space, and the mirror radius of the first lens is 15-16 mm relatively far away from the object space; the mirror radius of the second lens is 129-130 mm relatively close to the object space, and the mirror radius of the second lens relatively far away from the object space is 12-13 mm; the third lens has a mirror radius of 34-35 mm relatively close to the object space and a mirror radius of 60-61 mm relatively far away from the object space; the mirror radius of the fourth lens is 17-18 mm relatively close to the object side, and the mirror radius of the fourth lens relatively far away from the object side is 19.57mm; the mirror radius of the fifth lens is 17-18 mm relatively close to the object space, and the mirror radius of the fifth lens is 38-39 mm relatively far away from the object space; the radius of the mirror surface of the sixth lens relatively close to the object space is 15-16 mm, and the radius of the mirror surface relatively far away from the object space is 10-11 mm; the mirror radius of the seventh lens is 10-11 mm relatively close to the object space, and the mirror radius of the seventh lens relatively far away from the object space is 17-18 mm; the mirror radius of the eighth lens is 164-165 mm relatively close to the object space, and the mirror radius of the eighth lens relatively far away from the object space is 30-31 mm; the mirror radius of the ninth lens is 42-43 mm relatively close to the object side, and the mirror radius of the ninth lens is 19-20 mm relatively far away from the object side; the mirror radius of the tenth lens is 11-12 mm relatively close to the object space, and the mirror radius of the tenth lens is 29-30 mm relatively far away from the object space;

the aperture of the first lens is respectively that the mirror surface relatively close to the object space and the mirror surface relatively far away from the object spaceAnd->The aperture of the second lens is +.>And->The aperture of the third lens is +.> The aperture of the fourth lens is +.>And->The aperture of the fifth lens is +.>Andthe aperture of the sixth lens is +.> And->The aperture of the seventh lens is +.>And->The eighth lens is relatively close to the mirror surface and the object sideThe aperture of the mirror surface which is relatively far away from the object is +.>And->The aperture of the ninth lens is +.>And->The aperture of the tenth lens is +.>And->

The thickness of the first lens is 4.5-4.6 mm; the thickness of the second lens is 2.5-2.6 mm; the thickness of the third lens is 4.2-4.3 mm; the thickness of the fourth lens is 6.7-6.8 mm; the thickness of the fifth lens is 9.7-9.8 mm; the thickness of the sixth lens is 3.5-3.6 mm; the thickness of the seventh lens is 1.4-1.5 mm; the thickness of the eighth lens is 2.7-2.8 mm; the thickness of the ninth lens is 4.1-4.2 mm; the thickness of the tenth lens is 1.5-1.6 mm;

the distance between the first lens and the second lens is 11.9-12 mm; the distance between the second lens and the third lens is 4.5-4.6 mm; the distance between the third lens and the fourth lens is 2.9-3 mm; the distance between the fourth lens and the fifth lens is 0.2-0.3 mm; the distance between the fifth lens and the sixth lens is 0.5-0.6 mm; the distance between the seventh lens and the eighth lens is 1.1-1.2 mm; the distance between the eighth lens and the ninth lens is 0.1-0.2 mm; the distance between the ninth lens and the tenth lens is 2.3-2.4 mm.

2. A fish-eye lens as claimed in claim 1, wherein: the sixth lens and the seventh lens form a cemented lens.

3. A fish-eye lens as claimed in claim 1, wherein: the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are spherical surfaces.

4. A fish-eye lens as claimed in claim 1, wherein: the detector component is a CMOS low-illumination detector.

5. A fish-eye lens as claimed in claim 1, wherein: the optical glass mark of the first lens is LAF10LA; the optical glass mark of the second lens is HLAK5A; the optical glass brand of the third lens is HZLAF56B; the optical glass mark of the fourth lens is HZK9B; the optical glass mark of the fifth lens is HLAK59A; the optical glass brand of the sixth lens is HFK61; the optical glass mark of the seventh lens is HZF6; the optical glass mark of the eighth lens is HLAK53B; the optical glass mark of the ninth lens is HLAK5A; the optical glass of the tenth lens is HZF6.