CN210181292U - Microscopic optical imaging lens for marine plankton - Google Patents

Abstract

The utility model discloses a micro-optical imaging lens of ocean plankton, including a water proof window and the zoom lens group and the formation of image CCD of constituteing by 8 lenses, the zoom lens group is from the thing side to the picture side and is done in proper order: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the water-proof window is of a horizontal structure, the first lens, the third lens, the fifth lens and the sixth lens are double-cemented lenses for correcting chromatic aberration, and the second lens and the fourth lens are aspheric lenses with negative focal power; the seventh lens is an aspheric lens with positive focal power, the eighth lens is a lens with positive focal power, the imaging lens disclosed by the invention has ideal imaging quality, relatively simple structure, unchanged numerical aperture in the zooming process and larger imaging range under water. And the optical lens has larger imaging distance, can be provided with a sealing window and meets the imaging requirement.

Description

Microscopic optical imaging lens for marine plankton

Technical Field

The utility model relates to a micro-optical imaging lens of ocean plankton, in particular to big relative aperture, special three grades of zoom lenses under water of plankton observation under water.

Background

The optical microscopic objective lens used in the air medium is assembled with a water-proof sealing window, and the optical microscopic objective lens works underwater, so that the aberration of the lens is too large, the field angle is reduced, and the requirement of imaging quality cannot be met. Therefore, in order to meet the requirement of imaging in seawater, an imaging lens special for plankton used in seawater needs to be designed.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a plankton microscopic optics imaging lens to reach the imaging quality who has the ideal, have the purpose of great imaging range under water.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

a microscopic optical imaging lens for marine plankton comprises a water-proof window, a zoom lens group consisting of 8 lenses and an imaging CCD, wherein the zoom lens group comprises the following components in sequence from an object side to an image side: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the water-proof window is of a horizontal structure, the first lens, the third lens, the fifth lens and the sixth lens are double-cemented lenses for correcting chromatic aberration, and the second lens and the fourth lens are aspheric lenses with negative focal power; the seventh lens is an aspherical lens having positive power, and the eighth lens is a lens having positive power.

In the above scheme, the refractive index n of the material of the water-proof window is 1.51, and the abbe coefficient v is 64.16; the refractive index n of the material of the first lens is 1.74 and 1.55, and the Abbe coefficient v is 34.95 and 63.45; the refractive index n of the material of the second lens is 1.62, and the Abbe coefficient v is 60.11; the refractive index n of the material of the third lens is 1.58 and 1.56, and the Abbe coefficient v is 64.59 and 42.84; the refractive index n of the material of the fourth lens is 1.5, and the Abbe coefficient v is 61.18; the refractive index n of the fifth lens double-cemented material is 1.71 and 1.69, and the abbe coefficient v is 29.51 and 53.2; the refractive index n of the material of the sixth lens is 1.61 and 1.51, and the Abbe coefficient v is 49.82 and 60.4; the refractive index n of the material of the seventh lens is 1.62, and the Abbe coefficient v is 60.11; the refractive index n of the material of the eighth lens is 1.62, and the abbe number v is 60.11.

In the above scheme, the magnification of the optical imaging lens is 4, 2 and 1, and the numerical aperture NA value in the zooming process is 0.15.

In the above scheme, the total length of the optical imaging lens is 400mm, and the maximum imaging range is 8mm × 6 mm.

In the above solution, the second, fourth and seventh lenses satisfy the following aspheric surface formula:

in the formula, Z is a rotational symmetry axis of the aspheric surface, the origin of coordinates is taken at the vertex, and h is a radial coordinate perpendicular to the optical axis direction; c is the vertex curvature, k is the conic constant; a is₂、a₄、a₆… is a high-order coefficient.

Through the technical scheme, the utility model provides a microscopic optics imaging lens of ocean plankton has the imaging quality of comparison ideal, and the structure is simple relatively, and zoom in-process numerical aperture keeps unchangeable, has great imaging range under water. And the optical lens has larger imaging distance, can be provided with a sealing window and meets the imaging requirement.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is a schematic view of the optical structure of the microscopic optical imaging lens for marine plankton according to the present invention with a magnification of 4 times;

FIG. 2 is a schematic diagram of MTF curve with magnification of 4 times of the imaging lens of the marine plankton microscopy optics of the present invention;

FIG. 3 is a schematic diagram of field curvature and distortion curve of the marine plankton microscopic optical imaging lens with magnification of 4 times;

fig. 4 is an optical structure diagram of the marine plankton microscopic optical imaging lens of the utility model with a magnification of 2 times;

FIG. 5 is a schematic view of MTF curve with magnification of 2 times of the imaging lens of the marine plankton microscopy optics of the present invention;

FIG. 6 is a schematic diagram of field curvature and distortion curve of the marine plankton microscopic optical imaging lens of the present invention with magnification of 2 times;

fig. 7 is an optical structure diagram of the magnification of the microscopic optical imaging lens for marine plankton of the present invention is 1 time;

FIG. 8 is a schematic view of MTF curve with magnification of 1 times of the imaging lens of the marine plankton microscopy optics of the present invention;

fig. 9 is a schematic view of the field curvature and distortion curve of the marine plankton microscopic optical imaging lens with magnification of 1 time.

In the figure, 1, a water-proof window; 2. a first lens; 3. a second lens; 4. a third lens; 5. a fourth lens; 6. a diaphragm; 7. a fifth lens; 8. a sixth lens; 9. a seventh lens; 10. an eighth lens; 11. and imaging the CCD.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The utility model provides a microscopic optics imaging lens of ocean plankton, as shown in figure 1, this camera lens simple structure has great imaging range.

As shown in fig. 1, 4 and 7, the marine plankton microscopic optical imaging lens includes a water-proof window 1, a zoom lens group composed of 8 lenses, and an imaging CCD 11, where the zoom lens group sequentially includes from an object side to an image side: a first lens 2, a second lens 3, a third lens 4, a fourth lens 5, a stop 6, a fifth lens 7, a sixth lens 8, a seventh lens 9, and an eighth lens 10; the water-proof window 1 is of a horizontal structure, the first lens 2, the third lens 4, the fifth lens 7 and the sixth lens 8 are double-cemented lenses for correcting chromatic aberration, and the second lens 3 and the fourth lens 5 are aspheric lenses with negative focal power; the seventh lens 9 is an aspherical lens having positive power, and the eighth lens 10 is a lens having positive power.

In the present embodiment, the refractive index N of the material of the water insulating window 1 is 1.51, and the abbe number v is 64.16(N-BK 7); the refractive index N of the material of the first lens 2 is 1.74 and 1.55, and the abbe number v is 34.95 and 63.45(LAFN7 and N-PSK 3); the refractive index n of the material of the second lens 3 is 1.62, and the abbe number v is 60.11(SK 55); the refractive index n of the material of the third lens 4 is 1.58 and 1.56, and the abbe number v is 64.59 and 42.84(PSK54 and LF6 HT); the refractive index N of the material of the fourth lens 5 is 1.5, and the abbe number v is 61.18(N-ZK 7); the refractive index n of the double-cemented material of the fifth lens 7 is 1.71 and 1.69, and the abbe number v is 29.51 and 53.2(SF1 and P-LAK 35); the refractive index N of the material of the sixth lens 8 is 1.61 or 1.51, and the abbe number v is 49.82 or 60.4(N-SSK8 or K7); the refractive index n of the material of the seventh lens 9 is 1.62, and the abbe number v is 60.11(SK 55); the refractive index n of the material of the eighth lens 10 is 1.62, and the abbe number v is 60.11(SK 55).

The utility model discloses an optical imaging lens's magnification is 4, 2 and 1, and the process numerical aperture NA value of becoming doubly is 0.15. The total length of the optical imaging lens is 400mm, and the maximum imaging range is 8mm x 6 mm.

The second, fourth and seventh lenses satisfy the following aspheric surface formula:

in the formula, Z is a rotational symmetry axis of the aspheric surface, the origin of coordinates is taken at the vertex, and h is a radial coordinate perpendicular to the optical axis direction; c is the vertex curvature, k is the conic constant; a is₂、a₄、a₆… is a high-order coefficient.

Referring to fig. 3, fig. 6 and fig. 9, the field curvature and distortion curve of the marine plankton micro-optical imaging lens of the present invention are schematically illustrated. The utility model discloses a field curvature control can satisfy the requirement of formation of image under water within reasonable scope.

Referring to fig. 2, fig. 5 and fig. 8, the MTF curve of the marine plankton micro-optical imaging lens of the present invention is relatively smooth, and the MTF value under 42lp/mm reaches 0.5.

The utility model discloses the structural parameter of the microscopic optical imaging camera lens of ocean plankton multiplying power 4 times is shown in table 1.

TABLE 1 structural parameters of marine plankton microscopic optical imaging lens multiplying 4 times

The utility model discloses the structural parameter of the microscopic optical imaging camera lens of ocean plankton multiplying power 2 times is shown in table 2.

TABLE 2 structural parameters of marine plankton microscopic optical imaging lens with 2 times multiplying power

The utility model discloses the structural parameter of the microscopic optical imaging camera lens of ocean plankton multiplying power 1 times is shown in table 3.

TABLE 3 structural parameters of marine plankton microscopic optical imaging lens multiplying power 1 time

The utility model discloses zoom lens under water's aspheric surface coefficient is shown as table 4.

TABLE 4 coefficients of aspherical lenses

	a2	a4	a6
				Second surface	-1.306E-05	6.561E-07	-7.72E-09
Fourth surface	1.119E-04	-2.483E-06	-1.726E-09
				Seventh aspect of the invention	-3.240E-03	-4.150E-05	4.441E-07

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. The microscopic optical imaging lens for the marine plankton is characterized by comprising a water-proof window, a zoom lens group and an imaging CCD, wherein the zoom lens group consists of 8 lenses, and the zoom lens group sequentially comprises the following components from an object side to an image side: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the water-proof window is of a horizontal structure, the first lens, the third lens, the fifth lens and the sixth lens are double-cemented lenses for correcting chromatic aberration, and the second lens and the fourth lens are aspheric lenses with negative focal power; the seventh lens is an aspherical lens having positive power, and the eighth lens is a lens having positive power.

2. The marine plankton microscopic optical imaging lens according to claim 1, wherein the refractive index n of the material of the water-proof window is 1.51, and the abbe coefficient v is 64.16; the refractive index n of the material of the first lens is 1.74 and 1.55, and the Abbe coefficient v is 34.95 and 63.45; the refractive index n of the material of the second lens is 1.62, and the Abbe coefficient v is 60.11; the refractive index n of the material of the third lens is 1.58 and 1.56, and the Abbe coefficient v is 64.59 and 42.84; the refractive index n of the material of the fourth lens is 1.5, and the Abbe coefficient v is 61.18; the refractive index n of the fifth lens double-cemented material is 1.71 and 1.69, and the abbe coefficient v is 29.51 and 53.2; the refractive index n of the material of the sixth lens is 1.61 and 1.51, and the Abbe coefficient v is 49.82 and 60.4; the refractive index n of the material of the seventh lens is 1.62, and the Abbe coefficient v is 60.11; the refractive index n of the material of the eighth lens is 1.62, and the abbe number v is 60.11.

3. The marine plankton microscopic optical imaging lens according to claim 1, characterized in that the magnification of the optical imaging lens is 4, 2 and 1, and the numerical aperture NA value in the zooming process is 0.15.

4. The marine plankton microscopic optical imaging lens according to claim 1, wherein the optical imaging lens has a total length of 400mm and a maximum imaging range of 8mm x 6 mm.

5. The marine plankton microscopic optical imaging lens according to claim 1, wherein the second, fourth and seventh lenses satisfy the following aspheric surface formula:

in the formula, Z is a rotational symmetry axis of the aspheric surface, the origin of coordinates is taken at the vertex, and h is a radial coordinate perpendicular to the optical axis direction; c is the vertex curvature, k is the conic constant; a is₂、a₄、a₆… is a high-order coefficient.

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