Optical lens and optical device

Abstract

Disclosed is an optical lens and an optical device, which includes: a first lens group, a second lens group and an imaging sensor in order from the object side to the imaging side along the optical axis, and also includes a beam splitter element arranged between the first lens group and the imaging sensor, the first lens group is used to collimate the light after the plane of the object to be measured enters the lens, the first lens group includes a front lens group and a rear lens group, the front lens group has a negative refractive power, the rear lens group has a positive refractive power, the second lens group includes a lens group of a symmetrical double-glued structure, and the beam splitter element and the second lens group are used to image the collimated light on the imaging sensor according to different bands. The optical lens is compact and can be applied to hyperspectral imaging and detection cameras, and has strong practicality.

Description

[0001] Related Applications

[0002] This application is a divisional of the Chinese patent application with application number 201980014279.X filed on September 4, 2019, and the entire contents of the application are incorporated herein by reference. Technical Field

[0003] The present invention relates to the field of optical lenses, and in particular to an optical lens and an optical device. Background Art

[0004] The camera lens can collect external light and form an image on the sensor, but this method can only observe the appearance characteristics of the object to be tested and cannot detect and analyze its components. Hyperspectral imaging technology allows us to objectively observe and analyze the photographed objects from another dimension - the spectral dimension - based on imaging technology, and can be applied to different occasions according to different needs.

[0005] Hyperspectral imaging detection systems generally include components such as lighting and spectroscopic imaging. The spectroscopic method is generally grating spectroscopic or interference spectroscopic. The spectroscopic element also has special requirements for the camera used with it, with the premise of not affecting the spectral resolution. Currently, the cameras on the market are mostly used for imaging, which may not meet the requirements of the spectroscopic element, and the available bands may not meet the requirements of hyperspectral imaging bands. Summary of the invention

[0006] The invention provides an optical lens and an optical device.

[0007] According to one aspect of the present invention, an optical lens is proposed, which includes: a first lens group, a second lens group and an imaging sensor in order along the optical axis from the object side to the imaging side, and also includes a spectroscopic element arranged between the first lens group and the imaging sensor, the first lens group is used to collimate the light after the plane of the object to be measured enters the lens, the first lens group includes a front lens group and a rear lens group, the front lens group has a negative refractive power, the rear lens group has a positive refractive power, the second lens group includes a lens group of a symmetrical double-glued structure, and the spectroscopic element and the second lens group are used to image the collimated light on the imaging sensor according to different bands. By combining the spectroscopic element, the spectral resolution can be guaranteed and high-spectral imaging can be achieved, so that the lens has the advantages of small size and large field of view.

[0008] In some optional embodiments, a filter element is further included, and the filter element is arranged between the first lens group and the imaging sensor.

[0009] In some preferred embodiments, the beam splitter element is a beam splitter based on the Fabry-Perot interference principle. The beam splitter based on the Fabry-Perot interference principle can be matched with the lens to ensure the feasibility of hyperspectral imaging.

[0010] In some preferred embodiments, the lenses in the first lens group and the second lens group are glass lenses. The lens is made of glass, which can increase the degree of freedom of the refractive power configuration of the optical lens group.

[0011] In some specific embodiments, the first lens group includes, from the object side to the imaging side, a plano-convex positive lens, a biconcave negative lens, a meniscus positive lens, and a plano-convex positive lens, and the second lens group includes, from the object side to the imaging side, a meniscus positive lens, a doublet lens consisting of a biconcave negative lens and a biconvex positive lens, and a doublet lens consisting of a biconvex positive lens and a biconcave negative lens.

[0012] In a further preferred embodiment, the focal length f of the plano-convex positive lens is A1 , the focal length f of the biconcave negative lens A2 , the focal length f of the meniscus positive lens A3 , the focal length f of the plano-convex positive lens A4 , the focal length f of the meniscus positive lens A5 , the focal length f of the biconcave negative lens A6 , the focal length f of the biconvex positive lens A7 , the focal length f of the biconvex positive lens A8 and the focal length f of the biconcave negative lens A9 Satisfy the following conditions: 20 <f A1 <50, -15 <f A2 <-5,60 <f A3 <90,40 <f A4 <70, 15 <f A5 <35, -20 <f A6 <-4,15 <f A7 <40,140 <f A8 <170, -20 <f A9 <-3.

[0013] In a further preferred embodiment, the refractive index n of the plano-convex positive lens is A1 , the refractive index n of the biconcave negative lens A2 , the refractive index n of the meniscus positive lens A3 , the refractive index n of the plano-convex positive lens A4 , the refractive index n of the meniscus positive lens A5 , the refractive index n of the biconcave negative lens A6 , the refractive index n of the biconvex positive lens A7 , the refractive index n of the biconvex positive lens A8 and the refractive index n of the biconcave negative lens 39 Satisfy the following conditions: 1.4 <n A1 <1.6, 1.9 <n A2 <2.1, 1.4 <n A3<1.6, 1.4 <n A4 <1.6, 1.55 <n A5 <1.75, 1.4 <n A6 <1.6, 1.4 <n A7 <1.55, 1.4 <n A8 <1.55, 1.7 <n A9 <2.0.

[0014] In a further preferred embodiment, the Abbe number V of the plano-convex positive lens is A1 , the Abbe number V of the biconcave negative lens A2 , the Abbe number V of the meniscus positive lens A3 , the Abbe number V of the plano-convex positive lens A4 , the Abbe number V of the meniscus positive lens A5 , the Abbe number V of the biconcave negative lens A6 , the Abbe number V of the biconvex positive lens A7 , the Abbe number V of the biconvex positive lens A8 and the Abbe number V of the biconcave negative lens A9 Satisfy the following conditions: 55 <V A1 <75,20 <V A2 <40,55 <V A3 <75,55 <V A4 <75,15 <V A5 <35,50 <V A6 <70, 60 <V A7 <80,75 <V A8 <95,20 <V A9 <40.

[0015] In a further preferred embodiment, the field of view FOV of the optical lens is greater than 30°, the diopter of the first lens group is in the range of -100 to -70, and the diopter of the second lens group is in the range of 10 to 60. With the above parameter settings, the visible and infrared bands can be confocalized, and there is no need to refocus when changing the band.

[0016] In another specific embodiment, the first lens group includes, from the object side to the imaging side, a meniscus negative lens, a cemented lens composed of a meniscus negative lens and a biconvex positive lens, and the second lens group includes, from the object side to the imaging side, a biconvex positive lens, a double cemented lens composed of a biconcave negative lens and a biconvex positive lens, a cemented lens composed of a biconvex positive lens and a biconcave negative lens, and a biconvex positive lens.

[0017] In a further preferred embodiment, the focal length f of the meniscus negative lens is B1 , the focal length f of the meniscus negative lens B2 , the focal length f of the meniscus negative lens B3, the focal length f of the biconvex positive lens B4 , the focal length f of the biconvex positive lens B5 , the focal length f of the biconcave negative lens B6 , the focal length f of the biconvex positive lens B7 , the focal length f of the biconvex positive lens B8 , the focal length f of the biconcave negative lens B9 and the focal length f of the biconvex positive lens B10 Satisfies the following conditions: -50 <f B1 <-12, -40 <f B2 <-4, -30 <f B3 <-5,8 <f B4 <25,5 <f B5 <25, -25 <f B6 <-1,5 <f B7 <30,5 <f B8 <30, -20 <f B9 <-1, 1 <f B10 <20.

[0018] In a further preferred embodiment, the refractive index n of the meniscus negative lens is B1 , the refractive index n of the meniscus negative lens B2 , the refractive index n of the meniscus negative lens B3 , the refractive index n of the biconvex positive lens B4 , the refractive index n of the biconvex positive lens B5 , the refractive index n of the biconcave negative lens B6 , the refractive index n of the biconvex positive lens B7 and the refractive index n of the biconvex positive lens B8 , the refractive index n of the biconcave negative lens B9 and the refractive index n of the biconvex positive lens B10 Satisfy the following conditions: 1.5 <n B1 <1.7, 1.5 <n B2 <1.7, 1.8 <n B3 <2.0, 1.5 <n B4 <1.7, 1.8 <n B5 <2.0, 1.75 <n B6 <1.85, 1.4 <n B7 <1.6, 1.4 <n B8 <1.6, 1.8 <n B9 <2.0,1.55 <n B10 <1.65.

[0019] In a further preferred embodiment, the Abbe number V of the meniscus negative lens is B1 , the Abbe number V of the meniscus negative lens B2 , the Abbe number V of the meniscus negative lensB3 , the Abbe number V of the biconvex positive lens B4 , the Abbe number V of the biconvex positive lens B5 , the Abbe number V of the biconcave negative lens B6 , the Abbe number V of the biconvex positive lens B7 and the Abbe number V of the biconvex positive lens B8 , the Abbe number V of the biconcave negative lens B9 and the Abbe number V of the biconvex positive lens B10 Satisfy the following conditions: 40 <V B1 <60,50 <V B2 <70,10 <V B3 <30,45 <V B4 <65,10 <V B5 <30, 20 <V B6 <40,75 <V B7 <95,60 <V B8 <80,15 <V B9 <35,50 <V B10 <70.

[0020] In a further preferred embodiment, the field of view FOV of the optical lens is greater than 60°, the diopter of the first lens group is in the range of -100 to -200, and the diopter of the second lens group is in the range of 10 to 80. With the above parameter settings, the visible and infrared bands can be confocal, and there is no need to refocus when changing the band.

[0021] In another specific embodiment, the first lens group includes, from the object side to the imaging side, a meniscus positive lens, a biconcave negative lens, a biconcave negative lens, a cemented lens composed of a meniscus negative lens and a biconvex positive lens, and the second lens group includes, from the object side to the imaging side, a biconvex positive lens, a double cemented lens composed of a biconcave negative lens and a biconvex positive lens, a cemented lens composed of a biconvex positive lens, a biconcave negative lens and a biconvex positive lens.

[0022] In a further preferred embodiment, the focal length f of the meniscus positive lens is C1 , the focal length f of the biconcave negative lens C2 , the focal length f of the biconcave negative lens C3 , the focal length f of the meniscus negative lens C4 , the focal length f of the biconvex positive lens C5 , the focal length f of the biconvex positive lens C6 , the focal length f of the biconcave negative lens C7 , the focal length f of the biconvex positive lens C8 , the focal length f of the biconvex positive lens C9 , the focal length f of the biconcave negative lens C10 and the focal length f of the biconvex positive lens C11 Satisfy the following conditions: 55 <fC1 <95, -30 <f C2 <-10, -30 <f C3 <-10, -32 <f C4 <-8,15 <f C5 <35,10 <f C6 <30, -30 <f C7 <-5,5 <f C8 <30,3 <f C9 <30, -30 <f C10 <-3,3 <f C11 <30.

[0023] In a further preferred embodiment, the refractive index n of the meniscus positive lens is C1 , the refractive index n of the biconcave negative lens C2 , the refractive index n of the biconcave negative lens C3 , the refractive index n of the meniscus negative lens C4 , the refractive index n of the biconvex positive lens C5 , the refractive index n of the biconvex positive lens C6 , the refractive index n of the biconcave negative lens C7 , the refractive index n of the biconvex positive lens C8 , the refractive index n of the biconvex positive lens C9 , the refractive index n of the biconcave negative lens C10 and the refractive index n of the biconvex positive lens C11 Satisfy the following conditions: 1.5 <n C1 <1.7, 1.5 <n C2 <1.7, 1.5 <n C3 <1.7, 1.8 <n C4 <2.0, 1.4 <n C5 <1.6, 1.45 <n C6 <1.7, 1.8 <n C7 <2.0, 1.6 <n C8 <1.8, 1.4 <n C9 <1.7, 1.8 <n C10 <2.0, 1.5 <n C11 <1.7.

[0024] In a further preferred embodiment, the Abbe number V of the meniscus positive lens is C1 , the Abbe number V of the biconcave negative lens C2 , the Abbe number V of the biconcave negative lens C3 , the Abbe number V of the meniscus negative lens C4 , the Abbe number V of the biconvex positive lens C5 , the Abbe number V of the biconvex positive lens C6 , the Abbe number V of the biconcave negative lens C7, the Abbe number V of the biconvex positive lens C8 , the Abbe number V of the biconvex positive lens C9 , the Abbe number V of the biconcave negative lens C10 and the Abbe number V of the biconvex positive lens C11 Satisfy the following conditions: 40 <V C1 <60,50 <V C2 <70,45 <V C3 <65,10 <V C4 <30,50 <V C5 <70,10 <V C6 <30, 25 <V C7 <45, 60 <V C8 <80,60 <V C9 <80,15 <V C10 <35,50 <V C11 <70.

[0025] In a further preferred embodiment, the field of view FOV of the optical lens is greater than 90°, the diopter of the first lens group is in the range of -250 to -80, and the diopter of the second lens group is in the range of 5 to 60. With the above parameter settings, the visible and infrared bands can be co-focused, and there is no need to refocus when changing the band.

[0026] According to another aspect of the present invention, an optical device is provided. The optical device is equipped with the optical lens as described above.

[0027] The optical lens of the present invention includes a first lens group for collimating the light entering the lens from the plane of the object to be measured, a second lens group for imaging the collimated light on the imaging sensor according to different bands, a spectroscopic element and an imaging sensor. The spectroscopic element is arranged between the first lens group and the imaging sensor. The first lens group includes a front lens group with negative refractive power and a rear lens group with positive refractive power. A suitable filter element can also be selected according to demand and arranged before and after the spectroscopic element or before the imaging sensor. The design parameters of the optical lens meet the requirements of the spectroscopic element for the incident light angle, incident size, etc., to ensure high spectral resolution, and each band is imaged through the spectroscopic element to achieve scanning imaging of the spectral dimension, which is convenient for processing by the spectral algorithm, thereby obtaining the spectral information of the object to be measured, and realizing imaging and detection of the object to be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate the embodiments and are used together with the description to explain the principles of the present invention. It will be easy to recognize other embodiments and many expected advantages of the embodiments because they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale with each other. The same reference numerals refer to corresponding similar parts.

[0029] Figure 1a is a schematic structural diagram of an optical lens according to an embodiment of the present invention;

[0030] Figure 1b is a schematic structural diagram of an optical lens according to another embodiment of the present invention;

[0031] Figure 2 is a schematic diagram of the lens structure of an optical lens according to a first specific embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of the lens structure of an optical lens according to a second specific embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of the lens structure of an optical lens according to a third specific embodiment of the present invention;

[0034] Figure 5 is a schematic diagram of an optical device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In the following detailed description, reference is made to the accompanying drawings, which form a part of the detailed description and are shown by illustrative specific embodiments in which the present invention can be put into practice. To this end, directional terms, such as "top", "bottom", "left", "right", "up", "down", etc., are used with reference to the orientation of the figures described. Because the parts of the embodiments can be positioned in several different orientations, directional terms are used for the purpose of illustration and are by no means limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present invention. Therefore, the following detailed description should not be adopted in a limiting sense, and the scope of the present invention is defined by the appended claims.

[0036] Figure 1a FIG. 2 shows a schematic diagram of the structure of an optical lens according to an embodiment of the present invention. Figure 1aAs shown, the optical lens includes a first lens group 1, a spectroscopic element 2, a second lens group 3 and an imaging sensor 4 in order from the object side to the image side. The spectroscopic element 2 can be a grating spectroscopic type, an acousto-optic tunable filter spectroscopic type, a prism spectroscopic type, etc. based on different principles. Preferably, the present invention adopts a spectroscopic plate based on the Fabry-Perot interference principle, so that the continuous spectrum of visible infrared is split by the spectroscopic element 2 according to a certain step length, and all the separated bands are imaged on the imaging sensor 4 by the lens. The spectral information of the object to be measured can be obtained by spectral algorithm processing, thereby realizing hyperspectral imaging technology. In an alternative embodiment, as Figure 1b As shown, the optical lens may also be configured to include a first lens group 1, a second lens group 3, a beam splitter 2 and an imaging sensor 4 in sequence from the object side to the image side, and this may also achieve the technical effect of the present invention.

[0037] In a specific embodiment, the first lens group 1 is used to collimate the light after the plane of the object to be measured enters the lens, the first lens group 1 includes a front lens group and a rear lens group, the front lens group has a negative refractive power, and the rear lens group has a positive refractive power. The second lens group 3 includes a lens group of a symmetrical double-cemented structure, and the beam splitter 2 and the second lens group 3 are used to image the collimated light according to different wavelengths on the imaging sensor 4. By combining the beam splitter 2, the spectral resolution can be guaranteed and high-spectral imaging can be achieved, so that the lens has the advantages of small size and large field of view.

[0038] In an optional embodiment, a suitable filter element can be selected as needed and placed before or after the light splitting element 2 or before the imaging sensor 4. The filter element can be coated according to the actual application scenario to change the surface reflectivity, change the propagation direction of light, separate light waves, and synthesize light waves to achieve high transmittance of the filter light and filter out excess light.

[0039] In a preferred embodiment, the lens material of the first lens group 1 and the second lens group 3 is glass. The use of glass lenses can improve the optical performance of the lenses and increase the degree of freedom of the configuration of the refractive power of the optical lens group. It should be recognized that the material of the lenses in the first lens group 1 and the second lens group 3 can also be set to plastic material. The use of plastic material can greatly reduce the production cost. It is necessary to adjust the parameters such as the focal length and refractive index of the lens according to the corresponding imaging requirements, and the technical effect of the present invention can also be achieved.

[0040] Figure 2 FIG. 2 shows a schematic diagram of the lens structure of an optical lens according to a first specific embodiment of the present invention. Figure 2As shown, the optical lens includes a first lens group 100, an aperture 140, a beam splitter 120, a second lens group 110 and an imaging sensor 130 from the object side to the image side. The first lens group 100 includes a front lens group 100a and a rear lens group 100b. The front lens group 100a includes a plano-convex positive lens L101 and a biconcave negative lens L102 from the object side to the image side along the optical axis, the rear lens group 100b includes a meniscus positive lens L103 and a plano-convex positive lens L104 from the object side to the image side along the optical axis, and the second lens group 110 includes a double-cemented lens composed of a meniscus positive lens L105, a biconcave negative lens L106 and a biconvex positive lens L107, and a double-cemented lens composed of a biconvex positive lens L108 and a biconcave negative lens L109 from the object side to the image side along the optical axis. With the combination of the above lenses, confocalization can be achieved in the visible and infrared bands, and there is no need to refocus when changing the band.

[0041] In a specific embodiment, the field of view FOV of the optical lens is greater than 30°, and the visible and infrared bands are co-focused in real time, and there is no need to refocus when changing the band for shooting. The diopter of the first lens group 100a is taken from the range of -100 to -70, and the diopter of the second lens group 100b is taken from the range of 10 to 60. With the diopter settings of the first lens group 100a and the second lens group 100b, the first lens group 100 can achieve the collimation effect of the light, and at the same time reduce the angle of the incident light beam. The collimated light is incident on the beam splitter 120, and the light beam emitted from the beam splitter 120 enters the second lens group 110, and finally the imaging of the spatial dimension is realized on the imaging sensor 130.

[0042] In a specific embodiment, the focal length f of the plano-convex positive lens L101 is A1 , the focal length f of the biconcave negative lens L102 A2 , the focal length f of the meniscus positive lens L103 A3 , the focal length f of the plano-convex positive lens L104 A4 , the focal length f of the meniscus positive lens L105 A5 , the focal length f of the biconcave negative lens L106 A6 , the focal length f of the biconvex positive lens L107 A7 , the focal length f of the biconvex positive lens L108 A8 and the focal length f of the biconcave negative lens L109 A9 Satisfy the following conditions: 20 <f A1 <50, -15 <f A2 <-5,60 <f A3 <90,40 <f A4 <70, 15 <f A5 <35, -20 <f A6 <-4,15 <f A7 <40,140 <f A8<170, -20 <f A9 <-3. With this focal length setting, the entire module structure can be made more compact and smaller, making it easy to integrate into optical devices such as mobile phones.

[0043] In a specific embodiment, the refractive index n of the plano-convex positive lens L101 is A1 , the refractive index n of the biconcave negative lens L102 A2 , the refractive index n of the meniscus positive lens L103 A3 , the refractive index n of the plano-convex positive lens L104 A4 , the refractive index n of the meniscus positive lens L105 A5 , the refractive index n of the biconcave negative lens L106 A6 , the refractive index n of the biconvex positive lens L107 A7 , the refractive index n of the biconvex positive lens L108 A8 and the refractive index n of the biconcave negative lens L109 A9 Satisfy the following conditions: 1.4 <n A1 <1.6, 1.9 <n A2 <2.1, 1.4 <n A3 <1.6, 1.4 <n A4 <1.6, 1.55 <n A5 <1.75, 1.4 <n A6 <1.6, 1.4 <n A7 <1.55, 1.4 <n A8 <1.55, 1.7 <n A9 <2.0. In this way, lenses can be selected based on different materials, and with appropriate data matching, the optical lens can achieve better imaging effects.

[0044] In a specific embodiment, the Abbe number V of the plano-convex positive lens L101 is A1 , the Abbe number V of the biconcave negative lens L102 A2 , Abbe number V of the meniscus positive lens L103 A3 , Abbe number V of plano-convex positive lens L104 A4 , Abbe number V of the meniscus positive lens L105 A5 , the Abbe number V of the biconcave negative lens L106 A6 , the Abbe number V of the biconvex positive lens L107 A7 , the Abbe number V of the biconvex positive lens L108 A8 and the Abbe number V of the biconcave negative lens L109 A9 Satisfy the following conditions: 55 <V A1 <75,20 <V A2 <40,55 <V A3 <75,55 <V A4 <75,15 <VA5 <35,50 <V A6 <70, 60 <V A7 <80,75 <V A8 <95,20 <V A9 <40. . With the reasonable configuration of Abbe number, the optical chromatic aberration phenomenon during optical lens imaging can be effectively suppressed.

[0045] In a preferred embodiment, Table 1 shows the specific parameters of the optical lens of the first embodiment of the present invention:

[0046] Table 1:

[0047]

[0048]

[0049] Among them, R1 and R2 are the object side and image side of the plano-convex positive lens L101, R3 and R4 are the object side and image side of the biconcave negative lens L102, R5 and R6 are the object side and image side of the meniscus positive lens L103, R7 and R8 are the object side and image side of the plano-convex positive lens L104. R9 and R10 are the object side and image side of the meniscus positive lens L105, R11 is the object side of the biconcave negative lens L106, R12 and R13 are the object side and image side of the biconvex positive lens, R14 is the object side of the biconvex positive lens L108, R15 and R16 are the object side and image side of the biconcave negative lens L109, and the meanings of other symbols are as follows:

[0050] d1: thickness of plano-convex positive lens L101 on the optical axis;

[0051] d2: the distance on the optical axis from the image side of the plano-convex positive lens L101 to the object side of the biconcave negative lens L102;

[0052] d3: thickness of the biconcave negative lens L102 on the optical axis;

[0053] d4: the distance on the optical axis from the image side surface of the biconcave negative lens L102 to the object side surface of the plano-convex positive lens L103;

[0054] d5: thickness of the meniscus positive lens L103 on the optical axis;

[0055] d6: the distance on the optical axis from the image side surface of the plano-convex positive lens L103 to the object side surface of the plano-convex positive lens L104;

[0056] d7: thickness of the plano-convex positive lens L104 on the optical axis;

[0057] d8: distance from the image side of the plano-convex positive lens L104 to the aperture on the optical axis;

[0058] d9: distance between the aperture 140 and the beam splitter 120 on the optical axis;

[0059] d 10 : The thickness of the meniscus positive lens L105 on the optical axis;

[0060] d 11 : The distance on the optical axis from the image side of the plano-convex positive lens L105 to the object side of the biconcave negative lens L106;

[0061] d 12 : The thickness of the biconcave negative lens L106 on the optical axis;

[0062] d 13 : The thickness of the biconvex positive lens L107 on the optical axis;

[0063] d 14 : The distance on the optical axis from the image side surface of the biconvex positive lens L107 to the object side surface of the biconvex positive lens L108;

[0064] d 15 : The thickness of the biconvex positive lens L108 on the optical axis;

[0065] d 16 : The thickness of the biconcave negative lens L109 on the optical axis;

[0066] d 17 : The distance from the image side surface of the biconcave negative lens L109 to the imaging sensor 130 on the optical axis;

[0067] n1, n2, n3, n4, n5, n6, n7, n8, and n9 respectively represent the refractive indices of plano-convex positive lens L101, biconcave negative lens L102, meniscus positive lens L103, plano-convex positive lens L104, meniscus positive lens L105, biconcave negative lens L106, biconvex positive lens L107, biconvex positive lens L108, and biconcave negative lens L109.

[0068] Continue to refer Figure 3 , Figure 3 FIG. 2 shows a schematic diagram of the lens structure of an optical lens according to a second specific embodiment of the present invention. Figure 3As shown, the optical lens comprises a first lens group 200, a beam splitter 220, a second lens group 210 and an imaging sensor 230 in order from the object side to the image side. The first lens group 200 comprises a front lens group 200a and a rear lens group 200b. The front lens group 200a comprises a meniscus negative lens L201 and a meniscus negative lens L202 in order from the object side to the image side along the optical axis, the rear lens group 200b comprises a cemented lens composed of a meniscus negative lens L203 and a biconvex positive lens L204 in order from the object side to the image side along the optical axis, and the second lens group 210 comprises a double cemented lens composed of a biconvex positive lens L205, a biconcave negative lens L206 and a biconvex positive lens L207, a cemented lens composed of a biconvex positive lens L208 and a biconcave negative lens L209, and a biconvex positive lens L210 in order from the object side to the image side along the optical axis. The second lens group 210 adopts a multi-group symmetrical double-glued structure, which can reduce the chromatic aberration between different bands.

[0069] In a specific embodiment, the field of view FOV of the optical lens is greater than 60°, and the visible and infrared bands are co-focused in real time, and there is no need to refocus when changing the band for shooting. The diopter of the first lens group 200a is taken from the range of -200 to -100, and the diopter of the second lens group 200b is taken from the range of 10 to 80. With the diopter settings of the first lens group 200a and the second lens group 200b, the first lens group 200 can achieve the collimation effect of the light, and at the same time reduce the angle of the incident light beam. The collimated light is incident on the beam splitter 220, and the light beam emitted from the beam splitter 220 enters the second lens group 210, and finally the imaging of the spatial dimension is realized on the imaging sensor 230.

[0070] In a specific embodiment, the focal length f of the meniscus negative lens L201 is B1 , the focal length f of the meniscus negative lens L202 B2 , the focal length f of the meniscus negative lens L203 B3 , the focal length f of the biconvex positive lens L204 B4 , the focal length f of the biconvex positive lens L205 B5 , the focal length f of the biconcave negative lens L206 B6 , the focal length f of the biconvex positive lens L207 B7 and the focal length f of the biconvex positive lens L208 B8 , the focal length f of the biconcave negative lens L209 B9 and the focal length f of the biconvex positive lens L210 B10 Satisfies the following conditions: -50 <f B1 <-12, -40 <f B2 <-4, -30 <f B3 <-5,8 <f B4 <25,5 <f B5 <25, -25 <f B6 <-1,5 <fB7 <30,5 <f B8 <30, -20 <f B9 <-1, 1 <f B10 <20. With this focal length setting, the entire module structure can be made more compact and smaller, making it easy to integrate into optical devices such as mobile phones and cameras.

[0071] In a specific embodiment, the refractive index n of the meniscus negative lens L201 is B1 , the refractive index n of the meniscus negative lens L202 B2 , the refractive index n of the meniscus negative lens L203 B3 , the refractive index n of the biconvex positive lens L204 B4 , the refractive index n of the biconvex positive lens L205 B5 , the refractive index n of the biconcave negative lens L206 B6 , the refractive index n of the biconvex positive lens L207 B7 and the refractive index n of the biconvex positive lens L208 B8 , the refractive index n of the biconcave negative lens L209 B9 and the refractive index n of the biconvex positive lens L210 B10 Satisfy the following conditions: 1.5 <n B1 <1.7, 1.5 <n B2 <1.7, 1.8 <n B3 <2.0, 1.5 <n B4 <1.7, 1.8 <n B5 <2.0, 1.75 <n B6 <1.85, 1.4 <n B7 <1.6, 1.4 <n B8 <1.6, 1.8 <n B9 <2.0,1.55 <n B10 <1.65. In this way, lenses can be selected based on different materials, and with appropriate data matching, the optical lens can achieve better imaging effects.

[0072] In a specific embodiment, the Abbe number V of the meniscus negative lens L201 is B1 , the Abbe number V of the meniscus negative lens L202 B2 , the Abbe number V of the meniscus negative lens L203 B3 , the Abbe number V of the biconvex positive lens L204 B4 , the Abbe number V of the biconvex positive lens L205 B5 , the Abbe number V of the biconcave negative lens L206 B6 , the Abbe number V of the biconvex positive lens L207 B7 and the Abbe number V of the biconvex positive lens L208 B8 , the Abbe number V of the biconcave negative lens L209B9 and the Abbe number V of the biconvex positive lens L210 B10 Satisfy the following conditions: 40 <V B1 <60,50 <V B2 <70,10 <V B3 <30,45 <V B4 <65,10 <V B5 <30, 20 <V B6 <40,75 <V B7 <95,60 <V B8 <80,15 <V B9 <35,50 <V B10 <70. With the reasonable configuration of Abbe number, the optical chromatic aberration phenomenon during optical lens imaging can be effectively suppressed.

[0073] Continue to refer Figure 4 , Figure 4 FIG. 2 shows a schematic diagram of the lens structure of an optical lens according to a third specific embodiment of the present invention. Figure 4 As shown, the optical lens comprises a first lens group 300, a beam splitter 320, a second lens group 310 and an imaging sensor 330 in order from the object side to the image side. The first lens group 300 comprises a front lens group 300a and a rear lens group 300b. The front lens group 300a comprises a meniscus positive lens L301, a biconcave negative lens L302 and a biconcave negative lens L303 in order from the object side to the image side along the optical axis, the rear lens group 300b comprises a cemented lens composed of a meniscus negative lens L304 and a biconvex positive lens L305 in order from the object side to the image side along the optical axis, and the second lens group 310 comprises a double cemented lens composed of a biconvex positive lens L306, a biconcave negative lens L307 and a biconvex positive lens L308, and a cemented lens composed of a biconvex positive lens L309, a biconcave negative lens L310 and a biconvex positive lens L311 in order from the object side to the image side along the optical axis.

[0074] In a specific embodiment, the field of view FOV of the optical lens is greater than 90°, and the visible and infrared bands are co-focused in real time, and there is no need to refocus when changing the band for shooting. The diopter of the first lens group 300a is taken from the range of -250 to -80, and the diopter of the second lens group 300b is taken from the range of 5 to 60. With the diopter settings of the first lens group 300a and the second lens group 300b, the first lens group 300 can achieve the collimation effect of the light, and at the same time reduce the angle of the incident light beam. The collimated light is incident on the beam splitter 320, and the light beam emitted from the beam splitter 320 enters the second lens group 310, and finally the imaging of the spatial dimension is realized on the imaging sensor 330.

[0075] In a specific embodiment, the focal length f of the meniscus positive lens L301 is C1 , the focal length f of the biconcave negative lens L302C2 , the focal length f of the biconcave negative lens L303 C3 , the focal length f of the meniscus negative lens L304 C4 , the focal length f of the biconvex positive lens L305 C5 , the focal length f of the biconvex positive lens L306 C6 , the focal length f of the biconcave negative lens L307 C7 , the focal length f of the biconvex positive lens L308 C8 and the focal length f of the biconvex positive lens L309 C9 , the focal length f of the biconcave negative lens L310 C10 and the focal length f of the biconvex positive lens L311 C11 Satisfy the following conditions: 55 <f C1 <95, -30 <f C2 <-10, -30 <f C3 <-10, -32 <f C4 <-8,15 <f C5 <35,10 <f C6 <30, -30 <f C7 <-5,5 <f C8 <30,3 <f C9 <30, -30 <f C10 <-3,3 <f C11 <30. With this focal length setting, the entire module structure can be made more compact and smaller, making it easy to integrate into optical devices such as mobile phones.

[0076] In a specific embodiment, the refractive index n of the meniscus positive lens L301 is C1 , the refractive index n of the biconcave negative lens L302 C2 , the refractive index n of the biconcave negative lens L303 C3 , the refractive index n of the meniscus negative lens L304 C4 , the refractive index n of the biconvex positive lens L305 C5 , the refractive index n of the biconvex positive lens L306 C6 , the refractive index n of the biconcave negative lens L307 C7 , the refractive index n of the biconvex positive lens L308 C8 and the refractive index n of the biconvex positive lens L309 C9 , the refractive index n of the biconcave negative lens L310 C10 and the refractive index n of the biconvex positive lens L311 C11 Satisfy the following conditions: 1.5 <n C1 <1.7, 1.5 <n C2 <1.7, 1.5 <n C3 <1.7, 1.8 <n C4 <2.0, 1.4 <n C5<1.6, 1.45 <n C6 <1.7, 1.8 <n C7 <2.0, 1.6 <n C8 <1.8, 1.4 <n C9 <1.7, 1.8 <n C10 <2.0, 1.5 <n C11 <1.7. In this way, lenses can be selected based on different materials, and with appropriate data matching, the optical lens can achieve better imaging effects.

[0077] In a specific embodiment, the Abbe number V of the meniscus positive lens L301 is C1 , the Abbe number V of the biconcave negative lens L302 C2 , the Abbe number V of the biconcave negative lens L303 C3 , the Abbe number V of the meniscus negative lens L304 C4 , the Abbe number V of the biconvex positive lens L305 C5 , the Abbe number V of the biconvex positive lens L306 C6 , the Abbe number V of the biconcave negative lens L307 C7 , the Abbe number V of the biconvex positive lens L308 C8 and the Abbe number V of the biconvex positive lens L309 C9 , the Abbe number V of the biconcave negative lens L310 C10 and the Abbe number V of the biconvex positive lens L311 C11 Satisfy the following conditions: 40 <V C1 <60,50 <V C2 <70,45 <V C3 <65,10 <V C4 <30,50 <V C5 <70,10 <V C6 <30, 25 <V C7 <45, 60 <V C8 <80,60 <V C9 <80,15 <V C10 <35,50 <V C11 <70. With the reasonable configuration of Abbe number, the optical chromatic aberration phenomenon during optical lens imaging can be effectively suppressed.

[0078] Continue to refer to Figure 5 , which is a schematic diagram of an optical device according to an embodiment of the present invention. The optical device is a camera 10, including an image capturing device 20, and the image capturing device 20 includes an optical lens according to the present invention (not disclosed in the figure, please refer to Figure 2 , Figure 3 , Figure 4 Schematic diagram shown in the corresponding embodiment).

[0079] The optical lens of the present invention includes a first lens group for collimating the light entering the lens from the plane of the object to be tested, a second lens group for imaging the collimated light on the imaging sensor according to different bands, a spectroscopic element and an imaging sensor. The spectroscopic element is arranged between the first lens group and the imaging sensor. The first lens group includes a front lens group with negative refractive power and a rear lens group with positive refractive power. It is also possible to select a suitable filter element according to demand and arrange it before and after the spectroscopic element or before the imaging sensor. The design parameters of the optical lens meet the requirements of the spectroscopic element for the angle of incident light, the incident size, etc., to ensure high spectral resolution, and to image each band through the spectroscopic element to achieve scanning imaging of the spectral dimension, which is convenient for processing by the spectral algorithm, thereby obtaining the spectral information of the object to be tested, and realizing imaging and detection of the object to be tested. At the same time, the camera module based on the lens can have various specifications and parameters, and users can choose different specifications according to their needs to meet the use requirements.

[0080] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and changes are within the scope of the claims of the present invention and their equivalents, the present invention is also intended to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are recorded in mutually different dependent claims does not indicate that the combination of these measures cannot be used to profit. Any reference numerals in the claims should not be considered to limit the scope.

Claims

1. An optical lens, characterized in that: The device includes, in order from the object side to the imaging side along the optical axis: a first lens group, a second lens group and an imaging sensor, and also includes a beam splitter element arranged between the first lens group and the imaging sensor, the first lens group is used to collimate the light after the plane of the object to be measured enters the lens, the first lens group includes a front lens group and a rear lens group, the front lens group has a negative refractive power, the rear lens group has a positive refractive power, the second lens group includes a lens group of a symmetrical double-cemented structure, and the beam splitter element and the second lens group are used to image the collimated light on the imaging sensor according to different wavelength bands; The first lens group includes, from the object side to the imaging side, a meniscus positive lens, a first biconcave negative lens, a second biconcave negative lens, a cemented lens composed of a meniscus negative lens and a first biconvex positive lens, and the second lens group includes, from the object side to the imaging side, a cemented lens composed of a second biconvex positive lens, a third biconcave negative lens and a third biconvex positive lens, a fourth biconvex positive lens, a fourth biconcave negative lens and a fifth biconvex positive lens; The focal length f of the meniscus positive lens C1 , the focal length f of the first biconcave negative lens C2 , the focal length f of the second biconcave negative lens C3 , the focal length of the meniscus negative lens is f C4 , the focal length f of the first biconvex positive lens C5 , the focal length f of the second biconvex positive lens C6 , the focal length f of the third biconcave negative lens C7 , the focal length f of the third biconvex positive lens C8 and the focal length f of the fourth biconvex positive lens C9 , the focal length f of the fourth biconcave negative lens C10 and the focal length f of the fifth biconvex positive lens C11 Satisfies the following condition: 55<f C1 <95,-30<f C2 <-10,-30<f C3 <-10,-32<f C4 <-8,15<f C5 <35,10<f C6 <30,-30<f C7 <-5,5<f C8 <30,3<f C9 <30,-30<f C10 <-3,3<f C11 <30; The Abbe number V of the meniscus positive lens C1 , the Abbe number V of the first biconcave negative lens C2 , the Abbe number V of the second biconcave negative lens C3 , the Abbe number V of the meniscus negative lens C4 , the Abbe number V of the first biconvex positive lens C5 , the Abbe number V of the second biconvex positive lens C6 , the Abbe number V of the third biconcave negative lens C7 , the Abbe number V of the third biconvex positive lens C8 and the Abbe number V of the fourth biconvex positive lens C9 , the Abbe number V of the fourth biconcave negative lens C10 and the Abbe number V of the fifth biconvex positive lens C11 Satisfy the following condition: 40<V C1 <60,50<V C2 <70,45<V C3 <65,10<V C4 <30,50<V C5 <70,10<V C6 <30,25<V C7 <45,60<V C8 <80,60<V C9 <80,15<V C10 <35,50<V C11 <70.

2. The optical lens according to claim 1, characterized in that: The system also includes a filter element, which is disposed between the first lens group and the imaging sensor.

3. The optical lens according to claim 1, characterized in that: The spectroscopic element is specifically a spectroscopic plate based on the Fabry-Perot interference principle.

4. The optical lens according to claim 1, characterized in that: The lenses in the first lens group and the second lens group are glass lenses.

5. The optical lens according to claim 1, characterized in that: The refractive index n of the meniscus positive lens C1 , the refractive index n of the first biconcave negative lens C2 , the refractive index of the second biconcave negative lens is n C3 , the refractive index n of the meniscus negative lens C4 , the refractive index n of the first biconvex positive lens C5 , the refractive index of the second biconvex positive lens is n C6 , the refractive index n of the third biconcave negative lens C7 , the refractive index n of the third biconvex positive lens C8 and the refractive index n of the fourth biconvex positive lens C9 , the refractive index n of the fourth biconcave negative lens C10 and the refractive index n of the fifth biconvex positive lens C11 Satisfy the following condition: 1.5<n C1 <1.7,1.5<n C2 <1.7,1.5<n C3 <1.7,1.8<n C4 <2.0,1.4<n C5 <1.6,1.45<n C6 <1.7,1.8<n C7 <2.0,1.6<n C8 <1.8,1.4<n C9 <1.7,1.8<n C10 <2.0,1.5<n C11 <1.

7.

6. The optical lens according to claim 1, characterized in that: The field of view FOV of the optical lens is greater than 90°, the diopter of the first lens group is in the range of -250 to -80, and the diopter of the second lens group is in the range of 5 to 60.

7. An optical device, characterized in that: The optical device is equipped with an optical lens as described in any one of claims 1-6.

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