CN114964495A - Optical lens and optical equipment - Google Patents
Optical lens and optical equipment Download PDFInfo
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- CN114964495A CN114964495A CN202210643587.2A CN202210643587A CN114964495A CN 114964495 A CN114964495 A CN 114964495A CN 202210643587 A CN202210643587 A CN 202210643587A CN 114964495 A CN114964495 A CN 114964495A
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- 238000000701 chemical imaging Methods 0.000 abstract description 9
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- 230000003595 spectral effect Effects 0.000 description 13
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0208—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/021—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using plane or convex mirrors, parallel phase plates, or particular reflectors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
Abstract
Disclosed are an optical lens and an optical apparatus, which sequentially include, from an object side to an imaging side along an optical axis: the first lens group, second lens group and image sensor, still including setting up the light splitting element between first lens group and image sensor, first lens group is used for the light collimation behind the object plane entering camera lens that awaits measuring, first lens group includes preceding lens group and back lens group, preceding lens group has negative diopter, back lens group has positive diopter, the second lens group includes the lens group of two glued structures of symmetry formula, light splitting element and second lens group are used for imaging on image sensor according to the different wave bands with the light after the collimation. The optical lens has compact and small volume, can be applied to a hyperspectral imaging and detection camera, and has strong practicability.
Description
RELATED APPLICATIONS
This application is a divisional chinese patent application No. 201980014279.X filed on 04.9.9.2019, the entire contents of which are incorporated herein by reference.
Technical Field
The present invention relates to the field of optical lenses, and more particularly, to an optical lens and an optical apparatus.
Background
The camera lens can collect external light and image on the sensor, but the method only can view the external surface characteristics of the object to be measured and cannot detect and analyze the components contained in the object to be measured, and the hyperspectral imaging technology enables people to objectively view and analyze a shot object from another dimension, namely a spectral dimension, on the basis of the imaging technology and is applied to different occasions according to different requirements.
The hyperspectral imaging detection system generally comprises components such as illumination, spectroscopic imaging and the like, and the light splitting mode is generally grating light splitting or interference light splitting. The light splitting original piece also has special requirements for a camera matched with the light splitting original piece for use, so that the light splitting original piece is not influenced in spectrum resolution as a precondition, the camera on the market at present is mostly used for imaging, the use requirement of the light splitting original piece is not necessarily met, and the requirement of a hyperspectral imaging wave band can not necessarily be met by utilizing the wave band.
Disclosure of Invention
The invention provides an optical lens and an optical apparatus.
According to an aspect of the present invention, an optical lens is provided, which comprises, in order along an optical axis from an object side to an image side: the first lens group, second lens group and image sensor, still including setting up the light splitting element between first lens group and image sensor, first lens group is used for the light collimation behind the object plane entering camera lens that awaits measuring, first lens group includes preceding lens group and back lens group, preceding lens group has negative diopter, back lens group has positive diopter, the second lens group includes the lens group of two glued structures of symmetry formula, light splitting element and second lens group are used for imaging on image sensor according to the different wave bands with the light after the collimation. By combining the light splitting element, the spectral resolution can be ensured, the hyperspectral imaging can be realized, and the lens has the advantages of small volume and large field angle.
In some optional embodiments, the imaging lens further comprises a filter element disposed between the first lens group and the imaging sensor.
In some preferred embodiments, the light splitting element is a beam splitter based on the fabry-perot interference principle. The beam splitter based on the Fabry-Perot interference principle can be adapted to a lens, so that the feasibility of hyperspectral imaging is ensured.
In some preferred embodiments, the lenses of the first lens group and the second lens group are glass lenses. The lens is made of glass, so that the degree of freedom of the refractive power configuration of the optical lens group can be increased.
In some embodiments, the first lens group comprises, in order from the object side to the image side: plano-convex positive lens, biconcave negative lens, meniscus positive lens and plano-convex positive lens, the second lens group includes in proper order from the object side to the image side: a double-cemented lens consisting of a meniscus positive lens, a double-concave negative lens and a double-convex positive lens, and a double-cemented lens consisting of a double-convex positive lens and a double-concave negative lens.
In a further preferred embodiment, the focal length f of the plano-convex positive lens A1 Focal length f of biconcave negative lens A2 Focal length f of meniscus positive lens A3 Focal length f of plano-convex positive lens A4 Focal length f of meniscus positive lens A5 Focal length f of biconcave negative lens A6 Focal length f of biconvex positive lens A7 Focal length f of biconvex positive lens A8 And focal length f of biconcave negative lens A9 The following conditional expressions are satisfied: 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。
In a further preferred embodiment, the refractive index n of the plano-convex positive lens A1 Of, twoRefractive index n of concave negative lens A2 Refractive index n of meniscus positive lens A3 Refractive index n of plano-convex positive lens A4 Refractive index n of meniscus positive lens A5 Refractive index n of biconcave negative lens A6 Refractive index n of biconvex positive lens A7 Refractive index n of biconvex positive lens A8 And refractive index n of biconcave negative lens 39 The following conditional expressions are satisfied: 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 a further preferred embodiment, the Abbe number V of the plano-convex positive lens A1 Abbe number V of biconcave negative lens A2 Abbe number V of meniscus positive lens A3 Abbe number V of plano-convex positive lens A4 Abbe number V of meniscus positive lens A5 Abbe number V of biconcave negative lens A6 Abbe number V of biconvex positive lens A7 Abbe number V of biconvex positive lens A8 And Abbe number V of biconcave negative lens A9 The following conditional expressions are satisfied: 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。
In a further preferred embodiment, the FOV is greater than 30 degrees, the diopter of the first lens group is in the range of-100 diopter to-70 diopter, and the diopter of the second lens group is in the range of 10 diopter to 60 diopter. By means of the setting of the parameters, the confocal performance of the visible and infrared bands can be realized, and the band-changing shooting is not required to be focused again.
In another embodiment, the first lens group comprises, in order from an object side to an image side: the second lens group comprises in order from the object side to the imaging side: a double-cemented lens consisting of a double-convex positive lens, a double-concave negative lens and a double-convex positive lens, a cemented lens consisting of a double-convex positive lens and a double-concave negative lens, and a double-convex positive lens.
In a further preferred embodiment, the focal length f of the meniscus negative lens B1 Focal length f of negative meniscus lens B2 Focal length f of negative meniscus lens B3 Focal length f of biconvex positive lens B4 Focal length f of biconvex positive lens B5 Focal length f of biconcave negative lens B6 Focal length f of biconvex positive lens B7 Focal length f of biconvex positive lens B8 Focal length f of biconcave negative lens B9 And focal length f of biconvex positive lens B10 The following conditional expressions are satisfied: -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。
In a further preferred embodiment, the refractive index n of the meniscus negative lens B1 Refractive index n of meniscus negative lens B2 Refractive index n of meniscus negative lens B3 Refractive index n of biconvex positive lens B4 Refractive index n of biconvex positive lens B5 Refractive index n of biconcave negative lens B6 Refractive index n of biconvex positive lens B7 And refractive index n of biconvex positive lens B8 Refractive index n of biconcave negative lens B9 And refractive index n of biconvex positive lens B10 The following conditional expressions are satisfied: 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 a further preferred embodiment, the abbe number V of the negative meniscus lens B1 Abbe number V of negative meniscus lens B2 Abbe number V of negative meniscus lens B3 Abbe number V of biconvex positive lens B4 Abbe number V of biconvex positive lens B5 Double concaveAbbe number V of negative lens B6 Abbe number V of biconvex positive lens B7 And Abbe number V of biconvex positive lens B8 Abbe number V of biconcave negative lens B9 And Abbe number V of biconvex positive lens B10 The following conditional expressions are satisfied: 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。
In a further preferred embodiment, the field angle FOV of the optical lens is larger than 60 degrees, the diopter of the first lens group is in the range of-100 diopter to-200 diopter, and the diopter of the second lens group is in the range of 10 diopter to 80 diopter. By means of the setting of the parameters, the confocal performance of the visible and infrared bands can be realized, and the band-changing shooting is not required to be focused again.
In another specific embodiment, the first lens group comprises, in order from an object side to an image side: the second lens group includes in order from the object side to the imaging side: the lens comprises a double-cemented lens consisting of a double-convex positive lens, a double-concave negative lens and a double-convex positive lens, and a cemented lens consisting of a double-convex positive lens, a double-concave negative lens and a double-convex positive lens.
In a further preferred embodiment, the focal length f of the positive meniscus lens C1 Focal length f of biconcave negative lens C2 Focal length f of biconcave negative lens C3 Focal length f of negative meniscus lens C4 Focal length f of biconvex positive lens C5 Focal length f of biconvex positive lens C6 Focal length f of biconcave negative lens C7 Focal length f of biconvex positive lens C8 Focal length f of biconvex positive lens C9 Focal length f of biconcave negative lens C10 And focal length f of biconvex positive lens C11 The following conditional expressions are satisfied: 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。
In a further preferred embodiment, the refractive index n of the meniscus positive lens C1 Refractive index n of biconcave negative lens C2 Refractive index n of biconcave negative lens C3 Refractive index n of meniscus negative lens C4 Refractive index n of biconvex positive lens C5 Refractive index n of biconvex positive lens C6 Refractive index n of biconcave negative lens C7 Refractive index n of biconvex positive lens C8 Refractive index n of biconvex positive lens C9 Refractive index n of biconcave negative lens C10 And refractive index n of biconvex positive lens C11 The following conditional expressions are satisfied: 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 a further preferred embodiment, the abbe number V of the positive meniscus lens C1 Abbe number V of biconcave negative lens C2 Abbe number V of biconcave negative lens C3 Abbe number V of negative meniscus lens C4 Abbe number V of biconvex positive lens C5 Abbe number V of biconvex positive lens C6 Abbe number V of biconcave negative lens C7 Abbe number V of biconvex positive lens C8 Abbe number V of biconvex positive lens C9 Abbe number V of biconcave negative lens C10 And Abbe number V of biconvex positive lens C11 The following conditional expressions are satisfied: 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。
In a further preferred embodiment, the FOV is greater than 90 DEG, the diopter of the first lens group is in the range of-250 diopter to-80 diopter, and the diopter of the second lens group is in the range of 5 diopter to 60 diopter. By means of the setting of the parameters, the confocal performance of the visible and infrared bands can be realized, and the band-changing shooting is not required to be focused again.
According to another aspect of the present invention, there is provided an optical apparatus equipped with the optical lens described above.
The optical lens comprises a first lens group for collimating light entering the lens from an object plane to be measured, a second lens group for imaging the light on time and later on an imaging sensor according to different wave bands, a light splitting element and an imaging sensor, wherein the light splitting element is arranged between the first lens group and the imaging sensor, the first lens group comprises a front lens group with negative diopter and a rear lens group with positive diopter, and a proper filter element can be selected according to requirements and arranged in front of and behind the light splitting element or in front of the imaging sensor. The design parameters of the optical lens meet the requirements of the light splitting element on incident light angle, incident size and the like, high spectral resolution is guaranteed, imaging is carried out on each wave band through the light splitting element, scanning imaging of spectral dimensions is achieved, processing of a spectral algorithm is facilitated, spectral information of an object to be detected is obtained, and imaging and detection of the object to be detected are achieved.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and together with the description serve to explain the principles of the invention. Other embodiments and many of the intended advantages of embodiments will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.
FIG. 1a is a schematic diagram of an optical lens according to an embodiment of the present invention;
FIG. 1b is a schematic diagram of an optical lens according to another embodiment of the invention;
FIG. 2 is a schematic diagram of a lens structure of an optical lens according to a first embodiment of the invention;
FIG. 3 is a schematic diagram of a lens structure of an optical lens according to a second embodiment of the present invention;
fig. 4 is a schematic view of a lens structure of an optical lens according to a third embodiment of the present invention;
fig. 5 is a schematic diagram of an optical device according to an embodiment of the present invention.
Detailed Description
In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as "top," "bottom," "left," "right," "up," "down," etc., is used with reference to the orientation of the figures being described. Because components of embodiments can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and logical changes may be made without departing from the scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
Fig. 1a shows a schematic structural diagram of an optical lens according to an embodiment of the present invention. As shown in fig. 1a, the optical lens assembly includes, in order from an object side to an image side, a first lens group 1, a light splitting element 2, a second lens group 3 and an imaging sensor 4. The light splitting element 2 can be a grating light splitting type, an acousto-optic tunable filter light splitting type, a prism light splitting type and the like based on different principles. Preferably, the invention adopts a beam splitter based on the Fabry-Perot interference principle, visible infrared continuous spectrum is split by the beam splitter element 2 according to a certain step length, all the split wave bands are imaged on the imaging sensor 4 by the lens, and the spectral information of the object to be measured can be obtained by applying spectral algorithm processing, so that the hyperspectral imaging technology is realized. In an alternative embodiment, as shown in fig. 1b, it is also possible to arrange the optical lens to include the first lens group 1, the second lens group 3, the spectroscopic element 2, and the imaging sensor 4 in order from the object side to the image side, and this can achieve the technical effects of the present invention as well.
In a specific embodiment, the first lens group 1 is used for collimating light entering the lens from an object plane to be measured, the first lens group 1 includes a front lens group and a rear lens group, the front lens group has a negative diopter, the rear lens group has a positive diopter, the second lens group 3 includes a symmetrical lens group with a double-cemented structure, and the beam splitter 2 and the second lens group 3 are used for imaging the collimated light on the imaging sensor 4 according to different bands. By combining the light splitting element 2, the spectral resolution can be ensured, the hyperspectral imaging can be realized, and the lens has the advantages of small volume and large field angle.
In alternative embodiments, suitable filter elements may be selected as desired, placed before and after the spectroscopic element 2 or before the imaging sensor 4. The light filtering element can be coated according to practical application scenes so as to change the surface reflectivity, change the light transmission direction, separate light waves, synthesize the light waves to realize the high transmittance of the light rays of the light filtering sheet and filter out redundant light rays.
In a preferred embodiment, the first lens group 1 and the second lens group 3 are made of glass, and the optical performance of the lenses can be improved by using glass lenses, so as to increase the degree of freedom of the refractive power configuration of the optical lens groups. It should be appreciated that the material of the lenses in the first lens group 1 and the second lens group 3 can also be plastic, the use of plastic can greatly reduce the production cost, and the parameters such as the focal length and the refractive index of the lens need to be adjusted correspondingly to the corresponding imaging requirements, so as to achieve the technical effects of the present invention.
Fig. 2 shows a schematic lens structure of an optical lens according to a first specific embodiment of the present invention. As shown in fig. 2, the optical lens assembly includes, in order from an object side to an image side, a first lens group 100, a stop 140, a beam splitter 120, a second lens group 110 and an imaging sensor 130. The first lens group 100 includes a front lens group 100a and a rear lens group 100 b. The front lens group 100a sequentially includes a plano-convex positive lens element L101 and a biconcave negative lens element L102 along an optical axis from an object side to an image side, the rear lens group 100b sequentially includes a meniscus positive lens element L103 and a plano-convex positive lens element L104 along an optical axis from an object side to an image side, and the second lens group 110 sequentially includes a meniscus positive lens element L105, a biconcave negative lens element L106, a biconvex positive lens element L108, and a biconcave negative lens element L109 along an optical axis from an object side to an image side. By means of the combination arrangement of the lenses, confocal implementation of visible and infrared bands can be realized, and band-changing shooting is not required to be refocused.
In a specific embodiment, the field angle FOV of the optical lens is larger than 30 degrees, visible and infrared bands are confocal in real time, and refocusing is not needed during band-changing shooting. The diopter of the first lens group 100a is in a range of-100 to-70, and the diopter of the second lens group 100b is in a range of 10 to 60. By means of the diopter arrangement of the first lens group 100a and the second lens group 100b, the first lens group 100 can achieve the light collimation effect, and simultaneously reduce the incident beam angle, the collimated light beam enters the light splitting element 120, the light beam emitted from the light splitting element 120 enters the second lens group 110, and finally the imaging of the spatial dimension is achieved on the imaging sensor 130.
In a specific embodiment, the focal length f of the plano-convex positive lens L101 A1 Focal length f of biconcave negative lens L102 A2 Focal length f of meniscus positive lens L103 A3 Focal length f of plano-convex positive lens L104 A4 Focal length f of meniscus positive lens L105 A5 Focal length f of biconcave negative lens L106 A6 Focal length f of biconvex positive lens L107 A7 Focal length f of biconvex positive lens L108 A8 And focal length f of biconcave negative lens L109 A9 The following conditional expressions are satisfied: 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. By means of the arrangement of the focal length, the whole module structure is more compact, the size is smaller and more ingenious, and the whole module is easy to integrate to optical equipment such as a mobile phone.
In a specific embodiment, the refractive index n of the plano-convex positive lens L101 A1 Refractive index n of biconcave negative lens L102 A2 Refractive index n of meniscus positive lens L103 A3 Refractive index n of plano-convex positive lens L104 A4 Moon (R)Refractive index n of positive lens L105 A5 Refractive index n of biconcave negative lens L106 A6 Refractive index n of biconvex positive lens L107 A7 Refractive index n of biconvex positive lens L108 A8 And refractive index n of biconcave negative lens L109 A9 The following conditional expressions are satisfied: 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. Therefore, the lens can be selected based on different materials, and the optical lens can obtain a better imaging effect by means of proper data matching.
In a specific embodiment, the Abbe number V of the plano-convex positive lens L101 A1 Abbe number V of biconcave negative lens L102 A2 Abbe number V of meniscus positive lens L103 A3 Abbe number V of plano-convex positive lens L104 A4 Abbe number V of meniscus Positive lens L105 A5 Abbe number V of biconcave negative lens L106 A6 Abbe number V of biconvex positive lens L107 A7 Abbe number V of biconvex positive lens L108 A8 And Abbe number V of biconcave negative lens L109 A9 The following conditional expressions are satisfied: 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. . By means of reasonable configuration of the Abbe number, the optical chromatic aberration phenomenon during imaging of the optical lens can be effectively inhibited.
In a preferred embodiment, table 1 shows specific parameters of an optical lens of the first embodiment of the present invention:
table 1:
wherein, R1 and R2 are the object side and the image side of the plano-convex positive lens L101, R3 and R4 are the object side and the image side of the double concave negative lens L102, R5 and R6 are the object side and the image side of the meniscus positive lens L103, and R7 and R8 are the object side and the image side of the plano-convex positive lens L104. R9 and R10 are the object side surface and the image side surface of the meniscus positive lens L105, R11 is the object side surface of the biconcave negative lens L106, R12 and R13 are the object side surface and the image side surface of the biconvex positive lens, R14 is the object side surface of the biconvex positive lens L108, R15 and R16 are the object side surface and the image side surface of the biconcave negative lens L109, and the meanings of other symbols are as follows:
d 1 : the thickness of the plano-convex positive lens L101 on the optical axis;
d 2 : the distance on the optical axis from the image side surface of the plano-convex positive lens L101 to the object side surface of the biconcave negative lens L102;
d 3 : the thickness of the biconcave negative lens L102 on the optical axis;
d 4 : the distance on the optical axis from the image side surface of the double concave negative lens L102 to the object side surface of the plano-convex positive lens L103;
d 5 : the thickness of the positive meniscus lens L103 on the optical axis;
d 6 : 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;
d 7 : the thickness of the plano-convex positive lens L104 on the optical axis;
d 8 : the distance from the image side surface of the plano-convex positive lens L104 to the diaphragm on the optical axis;
d 9 : the distance on the optical axis from the diaphragm 140 to the spectroscopic sheet 120;
d 10 : the thickness of the meniscus positive lens L105 on the optical axis;
d 11 : the distance from the image side surface of the plano-convex positive lens L105 to the object side surface optical axis of the biconcave negative lens L106;
d 12 : the thickness of the biconcave negative lens L106 on the optical axis;
d 13 : biconvex positive lens L107A thickness on the shaft;
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;
d 15 : the thickness of the biconvex positive lens L108 on the optical axis;
d 16 : the thickness of the biconcave negative lens L109 on the optical axis;
d 17 : the distance on the optical axis from the image-side surface of the double concave negative lens L109 to the imaging sensor 130;
n 1 、n 2 、n 3 、n 4 、n 5 、n 6 、n 7 、n 8 、n 9 refractive indices of a plano-convex positive lens L101, a biconcave negative lens L102, a meniscus positive lens L103, a plano-convex positive lens L104, a meniscus positive lens L105, a biconcave negative lens L106, a biconvex positive lens L107, a biconvex positive lens L108, and a biconcave negative lens L109 are respectively indicated.
With continued reference to fig. 3, fig. 3 shows a schematic lens structure of an optical lens according to a second embodiment of the present invention. As shown in fig. 3, the optical lens assembly includes, in order from an object side to an image side, a first lens group 200, a light splitting element 220, a second lens group 210 and an imaging sensor 230. The first lens group 200 includes a front lens group 200a and a rear lens group 200 b. The front lens group 200a sequentially includes a negative meniscus lens element L201 and a negative meniscus lens element L202 from the object side to the image side along the optical axis, the rear lens group 200b sequentially includes a cemented lens element formed by a negative meniscus lens element L203 and a double convex positive lens element L204 from the object side to the image side along the optical axis, and the second lens group 210 sequentially includes a double cemented lens element formed by a double convex positive lens element L205, a double concave negative lens element L206 and a double convex positive lens element L207, a cemented lens element formed by a double convex positive lens element L208 and a double concave negative lens element L209, and a double convex positive lens element L210 from the object side to the image side along the optical axis. The second lens group 210 adopts a multi-group symmetrical double-cemented structure, which can reduce the chromatic aberration between different bands.
In a specific embodiment, the field angle FOV of the optical lens is larger than 60 degrees, visible and infrared bands are confocal in real time, and refocusing is not needed during band-changing shooting. The diopter of the first lens group 200a is in a range of-200 to-100, and the diopter of the second lens group 200b is in a range of 10 to 80. By means of the diopter arrangement of the first lens group 200a and the second lens group 200b, the first lens group 200 can achieve the light collimation effect, and at the same time, the incident beam angle is reduced, the collimated light beam enters the light splitting element 220, the light beam emitted from the light splitting element 220 enters the second lens group 210, and finally, the imaging of the spatial dimension is achieved on the imaging sensor 230.
In a specific embodiment, the focal length f of the meniscus negative lens L201 B1 Focal length f of the negative meniscus lens L202 B2 Focal length f of the negative meniscus lens L203 B3 Focal length f of biconvex positive lens L204 B4 Focal length f of biconvex positive lens L205 B5 Focal length f of biconcave negative lens L206 B6 Focal length f of biconvex positive lens L207 B7 And focal length f of biconvex positive lens L208 B8 Focal length f of biconcave negative lens L209 B9 And focal length f of biconvex positive lens L210 B10 The following conditional expressions are satisfied: -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. By means of the arrangement of the focal length, the whole module structure is more compact, the size is smaller and more ingenious, and the whole module is easy to integrate to optical equipment such as a mobile phone and a camera.
In a specific embodiment, the refractive index n of the negative meniscus lens L201 B1 Refractive index n of negative meniscus lens L202 B2 Refractive index n of negative meniscus lens L203 B3 Refractive index n of biconvex positive lens L204 B4 Refractive index n of biconvex positive lens L205 B5 Refractive index n of biconcave negative lens L206 B6 Refractive index n of biconvex positive lens L207 B7 And refractive index n of biconvex positive lens L208 B8 Refractive index n of biconcave negative lens L209 B9 And refractive index n of the biconvex positive lens L210 B10 The following conditional expressions are satisfied: 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. Therefore, the lens can be selected based on different materials, and the optical lens can obtain a better imaging effect by means of proper data matching.
In a specific embodiment, abbe number V of meniscus negative lens L201 B1 Abbe number V of meniscus negative lens L202 B2 Abbe number V of meniscus negative lens L203 B3 Abbe number V of biconvex positive lens L204 B4 Abbe number V of biconvex positive lens L205 B5 Abbe number V of biconcave negative lens L206 B6 Abbe number V of biconvex positive lens L207 B7 And Abbe number V of biconvex positive lens L208 B8 Abbe number V of biconcave negative lens L209 B9 And Abbe number V of biconvex positive lens L210 B10 The following conditional expressions are satisfied: 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. By means of reasonable configuration of the Abbe number, the optical chromatic aberration phenomenon during imaging of the optical lens can be effectively inhibited.
With continued reference to fig. 4, fig. 4 shows a schematic lens structure of an optical lens according to a third embodiment of the present invention. As shown in fig. 4, the optical lens assembly includes, in order from an object side to an image side, a first lens group 300, a light splitting element 320, a second lens group 310 and an imaging sensor 330. The first lens group 300 includes a front lens group 300a and a rear lens group 300 b. The front lens group 300a sequentially includes a positive meniscus lens element L301, a negative meniscus lens element L302, and a negative meniscus lens element L303 along an optical axis from an object side to an image side, the rear lens group 300b sequentially includes a cemented lens element formed by a negative meniscus lens element L304 and a positive biconvex lens element L305 along an optical axis from an object side to an image side, and the second lens group 310 sequentially includes a cemented lens element formed by a positive biconvex lens element L306, a negative biconcave lens element L307, and a positive biconvex lens element L308, a positive biconvex lens element L309, a negative biconcave lens element L310, and a positive biconvex lens element L311 along an optical axis from an object side to an image side.
In a specific embodiment, the field angle FOV of the optical lens is larger than 90 degrees, visible and infrared bands are confocal in real time, and refocusing is not needed when the band is changed for shooting. The diopter of the first lens set 300a is in a range from-250 diopter to-80 diopter, and the diopter of the second lens set 300b is in a range from 5 diopter to 60 diopter. By means of the diopter arrangement of the first lens group 300a and the second lens group 300b, the first lens group 300 can achieve the light collimation effect, and simultaneously reduce the incident beam angle, the collimated light enters the light splitting element 320, the light beam emitted from the light splitting element 320 enters the second lens group 310, and finally the imaging of the spatial dimension is achieved on the imaging sensor 330.
In a specific embodiment, the focal length f of the meniscus positive lens L301 C1 Focal length f of biconcave negative lens L302 C2 Focal length f of biconcave negative lens L303 C3 Focal length f of negative meniscus lens L304 C4 Focal length f of biconvex positive lens L305 C5 Focal length f of biconvex positive lens L306 C6 Focal length f of biconcave negative lens L307 C7 Focal length f of biconvex positive lens L308 C8 And focal length f of biconvex positive lens L309 C9 Focal length f of biconcave negative lens L310 C10 And focal length f of biconvex positive lens L311 C11 The following conditional expressions are satisfied: 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. By means of the arrangement of the focal length, the whole module structure is more compact, the size is smaller and more ingenious, and the whole module is easy to integrate to optical equipment such as a mobile phone.
In a specific embodiment, the refractive index n of the meniscus positive lens L301 C1 Refractive index n of biconcave negative lens L302 C2 Refractive index n of biconcave negative lens L303 C3 Refractive index n of negative meniscus lens L304 C4 Refractive index n of biconvex positive lens L305 C5 Refractive index n of biconvex positive lens L306 C6 Double concave negative lensRefractive index n of L307 C7 Refractive index n of biconvex positive lens L308 C8 And refractive index n of biconvex positive lens L309 C9 Refractive index n of biconcave negative lens L310 C10 And refractive index n of biconvex positive lens L311 C11 The following conditional expressions are satisfied: 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. Therefore, the lens can be selected based on different materials, and the optical lens can obtain a better imaging effect by means of proper data matching.
In a specific embodiment, the abbe number V of the meniscus positive lens L301 C1 Abbe number V of biconcave negative lens L302 C2 Abbe number V of biconcave negative lens L303 C3 Abbe number V of meniscus negative lens L304 C4 Abbe number V of biconvex positive lens L305 C5 Abbe number V of biconvex positive lens L306 C6 Abbe number V of biconcave negative lens L307 C7 Abbe number V of biconvex positive lens L308 C8 And Abbe number V of biconvex positive lens L309 C9 Abbe number V of biconcave negative lens L310 C10 And Abbe number V of biconvex positive lens L311 C11 The following conditional expressions are satisfied: 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. By means of reasonable configuration of the Abbe number, the optical chromatic aberration phenomenon during imaging of the optical lens can be effectively inhibited.
Referring to fig. 5, a schematic diagram of an optical apparatus according to an embodiment of the invention is shown. The optical apparatus is a camera 10, and includes an image capturing device 20, and the image capturing device 20 includes an optical lens according to the present invention (not shown, please refer to the schematic diagrams shown in the embodiments corresponding to fig. 2, fig. 3, and fig. 4).
The optical lens comprises a first lens group for collimating light entering the lens from an object plane to be measured, a second lens group for imaging the light on time on an imaging sensor according to different wave bands, a light splitting element and an imaging sensor, wherein the light splitting element is arranged between the first lens group and the imaging sensor, the first lens group comprises a front lens group with negative diopter and a rear lens group with positive diopter, and a proper filter element can be selected according to requirements and arranged in front of and behind the light splitting element or in front of the imaging sensor. The design parameters of the optical lens meet the requirements of the light splitting element on incident light angles, incident sizes and the like, high spectral resolution is guaranteed, imaging is carried out on each wave band through the light splitting element, scanning imaging of spectral dimensions is achieved, processing of a spectral algorithm is facilitated, spectral information of an object to be detected is obtained, imaging and detection of the object to be detected are achieved, meanwhile, a camera module based on the lens can have various specification parameters, and a user can select different specifications according to requirements to meet use requirements.
It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present invention without departing from the spirit and scope of the 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 than those listed in a claim. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims shall not be construed as limiting the scope.
Claims (7)
1. An optical lens, comprising, in order along an optical axis from an object side to an image side: the lens comprises a first lens group, a second lens group and an imaging sensor, and further comprises a light splitting element arranged between the first lens group and the imaging sensor, wherein the first lens group is used for collimating light rays entering a lens from an object plane to be measured, the first lens group comprises a front lens group and a rear lens group, the front lens group has negative diopter, the rear lens group has positive diopter, the second lens group comprises a lens group with a symmetrical double-gluing structure, and the light splitting element and the second lens group are used for imaging the collimated light rays on the imaging sensor according to different wave bands;
the first lens group comprises in order from an object side to an image side: the second lens group comprises, in order from the object side to the image side: a double cemented lens composed of a second biconvex positive lens, a third biconcave negative lens and a third biconvex positive lens, and a cemented lens composed of a fourth biconvex positive lens, a fourth biconcave negative lens and a fifth biconvex positive lens;
focal length f of the meniscus positive lens C1 Focal length f of the first biconcave negative lens C2 Focal length f of the second biconcave negative lens C3 Focal length f of said negative meniscus lens C4 Focal length f of the first biconvex positive lens C5 Focal length f of the second biconvex positive lens C6 Focal length f of the third biconcave negative lens C7 A focal length f of the third biconvex positive lens C8 And a focal length f of the fourth biconvex positive lens C9 Focal length f of the fourth biconcave negative lens C10 And a focal length f of the fifth biconvex positive lens C11 The following conditional expressions are satisfied: 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；
Abbe number V of the meniscus positive lens C1 Abbe number V of the first biconcave negative lens C2 Abbe number V of the second biconcave negative lens C3 Abbe number V of the meniscus negative lens C4 Abbe number V of the first biconvex positive lens C5 Abbe number V of the second biconvex positive lens C6 Abbe number V of the third biconcave negative lens C7 Abbe number V of the third biconvex positive lens C8 And an Abbe number V of the fourth biconvex positive lens C9 Abbe number V of the fourth biconcave negative lens C10 And an Abbe number V of the fifth biconvex positive lens C11 The following conditional expressions are satisfied: 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. An optical lens as recited in claim 1, further comprising a filter element disposed between the first lens group and the imaging sensor.
3. An optical lens according to claim 1, characterized in that the beam splitting element is in particular a beam splitter based on the fabry-perot interference principle.
4. An optical lens according to claim 1, wherein the lenses of the first lens group and the second lens group are glass lenses.
5. An optical lens according to claim 1, characterized in that the refractive index n of the meniscus positive lens C1 Refractive index n of the first biconcave negative lens C2 Refractive index n of the second biconcave negative lens C3 Refractive index n of said negative meniscus lens C4 Refractive index n of the first biconvex positive lens C5 Refractive index n of the second biconvex positive lens C6 Refractive index n of the third biconcave negative lens C7 Refractive index n of the third biconvex positive lens C8 And a refractive index n of the fourth biconvex positive lens C9 Refractive index n of the fourth biconcave negative lens C10 And refraction of the fifth biconvex positive lensRate n C11 The following conditional expressions are satisfied: n is more than 1.5 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. An optical lens according to claim 1, wherein the field angle FOV of the optical lens is greater than 90 °, the diopter of the first lens group is taken from the range of-250 to-80, and the diopter of the second lens group is taken from the range of 5 to 60.
7. An optical apparatus equipped with the optical lens according to any one of claims 1 to 6.
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