CN111929811B - A lens - Google Patents
A lens Download PDFInfo
- Publication number
- CN111929811B CN111929811B CN202010771779.2A CN202010771779A CN111929811B CN 111929811 B CN111929811 B CN 111929811B CN 202010771779 A CN202010771779 A CN 202010771779A CN 111929811 B CN111929811 B CN 111929811B
- Authority
- CN
- China
- Prior art keywords
- lens
- light beam
- curvature
- radius
- lens group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1445—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative
- G02B15/144513—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative arranged --++
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/106—Beam splitting or combining systems for splitting or combining a plurality of identical beams or images, e.g. image replication
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B11/00—Filters or other obturators specially adapted for photographic purposes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
本发明公开了一种镜头，包括：第一透镜组、第二透镜组、第三透镜组、第四透镜组、分光装置、滤光装置和识别装置，第一透镜组、第二透镜组、第三透镜组、第四透镜组、分光装置、滤光装置和识别装置依次设置在物体侧和成像侧之间；分光装置的入口与第四透镜组的出口衔接，分光装置的出口与滤光装置的入口衔接，用于将第四透镜组的出口处的光束分隔成水平光束和竖直光束，并将水平光束和竖直光束独立发送至滤光装置；滤光装置用于接收水平光束和竖直光束，并对水平光束和竖直光束进行滤光处理，以及将被滤光处理的水平光束和竖直光束独立发送至识别装置；识别装置用于接收并识别被滤光处理的水平光束和竖直光束。
The invention discloses a lens, comprising: a first lens group, a second lens group, a third lens group, a fourth lens group, a spectroscopic device, a filtering device and an identification device, wherein the first lens group, the second lens group, the third lens group, the fourth lens group, the spectroscopic device, the filtering device and the identification device are sequentially arranged between the object side and the imaging side; the inlet of the spectroscopic device is connected with the outlet of the fourth lens group, and the outlet of the spectroscopic device is connected with the inlet of the filtering device, so as to separate the light beam at the outlet of the fourth lens group into a horizontal light beam and a vertical light beam, and independently send the horizontal light beam and the vertical light beam to the filtering device; the filtering device is used to receive the horizontal light beam and the vertical light beam, filter the horizontal light beam and the vertical light beam, and independently send the filtered horizontal light beam and the vertical light beam to the identification device; the identification device is used to receive and identify the filtered horizontal light beam and the vertical light beam.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens.
Background
With the development of society, the safety precaution consciousness of people is continuously improved, the security monitoring industry is also developed at a high speed, and the monitoring function is also increased. Zoom lenses have been practically designed and used in the last century, and as lens design technology develops, the application occasions of the zoom lenses are gradually increased. Nowadays, the zoom lens is widely applied to the fields of civil products, security monitoring and the like. For example, high-pixel, wide-band and large-aperture 3D recognition lenses are mostly used in the fields of vehicle-mounted, machine vision, public safety, monitoring and the like, and in public safety recognition, a dual-lens mode is mostly adopted to respectively recognize visible light and infrared light through dual CMOS (Complementary Metal Oxide Semiconductor complementary metal oxide semiconductor), but dual lenses involve software splicing and complex algorithm processing, and have complex structure, high cost and adverse effect on improving market competitiveness.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art.
Therefore, the invention provides the lens which can be used for independently identifying the visible light and the infrared light, has a simple structure and is beneficial to reducing the cost.
The lens comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a light splitting device, a light filtering device and a recognition device, wherein the first lens group, the second lens group, the third lens group, the fourth lens group, the light splitting device, the light filtering device and the recognition device are sequentially arranged between an object side and an imaging side; the light splitting device is arranged between the fourth lens group and the light filtering device, an inlet of the light splitting device is connected with an outlet of the fourth lens group, an outlet of the light splitting device is connected with an inlet of the light filtering device, and the light splitting device is used for dividing a light beam at the outlet of the fourth lens group into a horizontal light beam and a vertical light beam and independently sending the horizontal light beam and the vertical light beam to the light filtering device;
The light filtering device is arranged between the light splitting device and the identification device and is used for receiving the horizontal light beam and the vertical light beam, filtering the horizontal light beam and the vertical light beam, and independently transmitting the filtered horizontal light beam and vertical light beam to the identification device;
the identification device is used for receiving and identifying the filtered horizontal light beam and the filtered vertical light beam.
The lens provided by the embodiment of the invention has the advantages that the aberration is reduced by the plurality of groups of lens groups, the imaging quality is improved, the light beams passing through the plurality of groups of lens groups are separated into horizontal light beams and vertical light beams by the light splitting device, the horizontal light beams and the vertical light beams are independently transmitted to the light filtering device for filtering treatment, the light filtering device respectively independently transmits the horizontal light beams and the vertical light beams which are subjected to filtering treatment to the identification device for independent identification imaging, and the lens in the technical scheme can be used for independent identification of visible light and infrared light, has the function of double lenses, is simple in structure, and is beneficial to cost reduction.
According to some embodiments of the invention, the first lens group comprises a first lens and a second lens, wherein the first lens and the second lens are both negative focal power lenses, the first lens and the second lens are crescent-shaped, the convex side of the first lens faces the object side, and the concave side of the first lens faces the convex side of the second lens.
According to some embodiments of the invention, the first lens satisfies the following conditions-44 < f (100) < -25;1.7< D 1/R2＜1.82;1.7＜Nd1 <1.8, where f (100) is the focal length of the first lens, nd 1 is the refractive index of the first lens, D 1 is the diameter of the concave side of the first lens, and R 2 is the radius of curvature of the concave side of the first lens.
According to some embodiments of the invention, the second lens group comprises a third lens and a fourth lens, wherein edges of the third lens and the fourth lens are glued to form a negative power lens, the third lens is crescent-shaped, the fourth lens is a biconcave lens, the concave side of the third lens faces the concave side of the second lens, the convex side of the third lens faces the fourth lens, and the radius of curvature of the concave side of the fourth lens facing the third lens is the same as the radius of curvature of the convex side of the third lens.
According to some embodiments of the present invention, the third lens group comprises a fifth lens and a sixth lens, wherein the fifth lens and the sixth lens are both biconvex lenses and are both positive power lenses, and the fifth lens is disposed between the fourth lens and the sixth lens.
According to some embodiments of the invention, the fifth lens and the sixth lens satisfy the condition 1.1< |f (500)/f (600) | <2.2, where f (500) is a focal length of the fifth lens and f (600) is a focal length of the sixth lens.
According to some embodiments of the invention, the fourth lens group comprises a seventh lens and an eighth lens, wherein edges of the seventh lens and the eighth lens are glued to form a positive power lens, the seventh lens is a meniscus lens, the eighth lens is a biconvex lens, a convex side of the seventh lens faces the sixth lens, a concave side of the seventh lens faces a convex side of the eighth lens, and a radius of curvature of the concave side of the seventh lens is the same as a radius of curvature of the convex side of the eighth lens.
According to some embodiments of the invention, the third, sixth and seventh lenses meet the condition 2.6< |R 31/R61+R71 | <4, where R 31 is the radius of curvature of the concave side of the third lens, R 61 is the radius of curvature of the sixth lens towards the fifth lens, and R 71 is the radius of curvature of the convex side of the seventh lens.
According to some embodiments of the invention, the first lens and the seventh lens meet the condition R 12＞R72, wherein R 12 is the radius of curvature of the concave side of the first lens and R 72 is the radius of curvature of the concave side of the seventh lens.
According to some embodiments of the invention, the fourth lens group further comprises a ninth lens and a tenth lens, wherein edges of the ninth lens and the tenth lens are glued to form a negative power lens, the ninth lens is a biconcave lens, the tenth lens is a biconvex lens, and a radius of curvature of the ninth lens towards a concave side of the tenth lens is the same as a radius of curvature of the tenth lens towards a convex side of the ninth lens.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of a lens barrel according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a path of a light beam through a lens according to an embodiment of the present invention;
FIG. 3 is a schematic view illustrating a lens structure according to another embodiment of the present invention;
FIG. 4 is a diagram illustrating a path of a light beam through a lens according to another embodiment of the present invention;
FIG. 5 is a graph of a transfer function (MTF) of a lens at 400-700nm according to an embodiment of the present invention;
Fig. 6 is a graph of a transfer function (MTF) of a lens at 800-1000nm according to an embodiment of the present invention.
Reference numerals:
A first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a first lens 100, a second lens 200, a third lens 300, a fourth lens 400, a fifth lens 500, a sixth lens 600, a seventh lens 700, an eighth lens 800, a ninth lens 900, a tenth lens 110, an eleventh lens 120, a twelfth lens 130, a spectroscopic device 140, a filter device 150, a first filter 1501, a second filter 1502, a recognition device 160, a first chip 1601, a second chip 1602, a first protective window 1603, a second protective window 1604
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that, with reference to the description of the orientation, the terms "center, longitudinal, lateral, length, width, thickness, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner, outer, circumferential, radial, circumferential", etc., refer to the orientation or positional relationship as indicated on the basis of the drawings, merely for convenience of describing the present invention and for simplicity of description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
A lens barrel according to an embodiment of the present invention is described below with reference to fig. 1 and 3.
As shown in fig. 1 and 3, a lens barrel according to an embodiment of the present invention includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a light splitting device 140, a light filtering device 150, and a recognition device 160, the first lens group G1, the second lens group G2, the third lens group G3, the fourth lens group G4, the light splitting device 140, the light filtering device 150, and the recognition device 160 being disposed in this order between an object side and an imaging side.
Specifically, the beam splitting device 140 is disposed between the fourth lens group G4 and the optical filtering device 150, the inlet of the beam splitting device 140 is engaged with the outlet of the fourth lens group G4, the outlet of the beam splitting device 140 is engaged with the inlet of the optical filtering device 150, as shown in fig. 2 and 4, the beam splitting device 140 is configured to split the light beam at the outlet of the fourth lens group G4 into a horizontal light beam and a vertical light beam, and send the horizontal light beam and the vertical light beam to the optical filtering device 150 independently. The filtering device 150 is disposed between the beam splitting device 140 and the recognition device 160, and the filtering device 150 is configured to receive the horizontal beam and the vertical beam, perform filtering processing on the horizontal beam and the vertical beam, and independently transmit the filtered horizontal beam and vertical beam to the recognition device 160. The recognition device 160 is used to receive and recognize the filtered horizontal and vertical beams and to image the beams.
The lens groups are beneficial to weakening aberration and improving imaging quality; the beam passing through the plurality of groups of lens groups is separated into horizontal beams and vertical beams by the beam splitting device 140, the horizontal beams and the vertical beams are independently transmitted to the filtering device 150 for filtering treatment, the filtering device 150 respectively independently transmits the filtered horizontal beams and the filtered vertical beams to the identifying device 160 for independent identification imaging, and the lens in the technical scheme can be used for independent identification of visible light and infrared light, has the function of double lenses, is simple in structure and is beneficial to cost reduction.
In some embodiments of the present invention, the first lens group G1 includes a first lens 100 and a second lens 200, each of the first lens 100 and the second lens 200 is a negative power lens, each of the first lens 100 and the second lens 200 is crescent-shaped, a convex side of the first lens 100 faces an object side, and a concave side of the first lens 100 faces a convex side of the second lens 200.
Further, the first lens satisfies the following conditions that-44 < f (100) < -25;1.7< D1/R2<1.82;
1.7< nd1<1.8, where f (100) is the focal length of the first lens 100, nd1 is the refractive index of the first lens 100, D1 is the diameter of the concave side of the first lens (100), i.e. the diameter of the meniscus (the effective clear aperture on the right of the lens) of the first lens (100), and R2 is the radius of curvature of the concave side of the first lens (100).
In some embodiments of the present invention, the second lens group G2 includes a third lens 300 and a fourth lens 400, edges of the third lens 300 and the fourth lens 400 are cemented to form a negative power lens, the third lens 300 is crescent-shaped, the fourth lens 400 is a biconcave lens, a concave side of the third lens 300 faces a concave side of the second lens 200, a convex side of the third lens 300 faces the fourth lens 400, and a radius of curvature of the fourth lens 400 toward the concave side of the third lens 300 is the same as a radius of curvature of the convex side of the third lens 300.
In some embodiments of the present invention, the third lens group G3 includes a fifth lens 500 and a sixth lens 600, the fifth lens 500 and the sixth lens 600 are both biconvex lenses and are both positive power lenses, and the fifth lens 500 is disposed between the fourth lens 400 and the sixth lens 600.
Further, the fifth lens 500 and the sixth lens 600 satisfy the condition of 1.1< |f (500)/f (600) | <2.2, where f (500) is the focal length of the fifth lens 500 and f (600) is the focal length of the sixth lens 600.
Further, abbe number Abbe of the fifth lens 500 satisfies 30< Abbe <40.
In some embodiments of the present invention, the fourth lens group G4 includes a seventh lens 700 and an eighth lens 800, the seventh lens 700 is a negative power lens, the eighth lens 800 is a positive power lens, edges of the seventh lens 700 and the eighth lens 800 are cemented to form a positive power lens, the seventh lens 700 is a meniscus lens (left convex right concave), the eighth lens 800 is a biconvex lens, a convex side of the seventh lens 700 faces the sixth lens 600, a concave side of the seventh lens 700 faces a convex side of the eighth lens 800, and a radius of curvature of the concave side of the seventh lens 700 is the same as a radius of curvature of the convex side of the eighth lens 800.
Further, the third lens 300, the sixth lens 600 and the seventh lens 700 satisfy the condition of 2.6< -R 31/R61+R71 <4 >, wherein R 31 is the radius of curvature of the concave side of the third lens 300, R 61 is the radius of curvature of the sixth lens 600 towards the fifth lens 500, and R 71 is the radius of curvature of the convex side of the seventh lens 700.
Further, the first lens 100 and the seventh lens 700 satisfy the following condition R 12＞R72, wherein R 12 is a radius of curvature of a concave side of the first lens 100, and R 72 is a radius of curvature of a concave side of the seventh lens 700.
Further, abbe number Abbe of seventh lens 700 satisfies 30< Abbe <40.
Further, a diaphragm, which is now luminous flux and corrects aberration, is provided between the sixth lens 600 and the seventh lens 700.
In some embodiments of the present invention, the fourth lens group G4 further comprises a ninth lens 900 and a tenth lens 110, wherein the ninth lens 900 is a negative power lens, the tenth lens 110 is a positive power lens, edges of the ninth lens 900 and the tenth lens 110 are cemented to form the negative power lens, the ninth lens 900 is a biconcave lens, the tenth lens 110 is a biconvex lens, and a radius of curvature of a concave side of the ninth lens 900 toward the tenth lens 110 is the same as a radius of curvature of a convex side of the tenth lens 110 toward the ninth lens 900.
Further, the refractive index Nd 10 of the tenth lens 110 satisfies 1.5< Nd 10 <1.70, and the refractive index Nd 70 of the seventh lens 700 satisfies Nd 70 >1.8.
In some embodiments of the present invention, the fourth lens group G4 further comprises an eleventh lens 120, the eleventh lens 120 being a biconvex lens and being a positive power lens, the first lens 100 and the eleventh lens 120 satisfying the condition 1.3< |f (100)/f (120) <2.5, wherein f (100) is a focal length of the first lens 100 and f (120) is a focal length of the eleventh lens 120.
In some embodiments of the present invention, the fourth lens group G4 further includes a twelfth lens 130, and the twelfth lens 130 is a biconvex lens and a positive power lens.
In some embodiments of the present invention, the beam splitting device 140 is a wavelength beam splitting device, which may be a cubic beam splitting mirror, and is glued by two 45-degree rectangular prisms, and the glued surface is a beam splitting surface. In other embodiments, the beam splitting device 140 may also be a planar flat beam splitter, but needs to be placed at 45 degrees. The light splitting device 140 splits light of (400-760) nm and (800-1100) nm into two different wave bands, and the optical axes of the light of the two wave bands are mutually perpendicular after light splitting. In the present embodiment, it is not limited to which specific wavelength band is the horizontal beam or the vertical beam, but the filter device 150 and the identification device 160 corresponding to the corresponding wavelength band are required.
Further, the Abbe number Abbe of the third lens 300 is smaller than the Abbe number Abbe of the spectroscopic device 140.
In some embodiments of the present invention, the filtering device 150 includes a first filter 1501 and a second filter 1502, the first filter 1501 is configured to receive the horizontal light beam and filter the horizontal light beam and transmit the filtered horizontal light beam to the recognition device 160, and the second filter 1502 is configured to receive the vertical light beam and filter the vertical light beam and transmit the filtered vertical light beam to the recognition device 160.
In some embodiments of the present invention, the recognition device 160 includes a first chip 1601 and a second chip 1602, the first chip 1601 is configured to receive and recognize the filtered horizontal beam, and the second chip 1602 is configured to receive and recognize the filtered vertical beam, and to fusion process the horizontal beam image and the vertical beam image through an image fusion algorithm. In this embodiment, the first chip 1601 and the second chip 1602 are both CMOS chips.
In some embodiments of the present invention, a first protective window 1603 for dust protection is provided on the first chip 1601, and a second protective window 1604 for dust protection is provided on the second chip 1602
In some embodiments of the invention, the optical back focus BF of the lens and the focal length of the lens satisfy BF/f >4.
Further, an aperture coefficient of the lens is 1.4 or more.
Further, the angle of view of the lens is 120 °.
The optical transfer function is used for evaluating an imaging quality of the imaging system in a more accurate, visual and common mode, and the higher and smoother the curve is, which shows that the better the imaging quality of the system is, the better correction is carried out on various aberrations (such as spherical aberration, coma aberration, astigmatism, field curvature, axial chromatic aberration, vertical chromatic aberration and the like).
As shown in FIG. 5, the optical transfer function (MTF) curve of the lens in the wide-angle state of the visible light band (400-700 nm) is shown, the abscissa thereof is the resolution, the unit is 1p/mm, and the ordinate thereof is the MTF value. As shown in fig. 5, the visible light curve smoothly drops and concentrates. At 250p/mm, an MTF value of greater than 0.2 can still be ensured. Therefore, the lens performance of the system can reach higher pixel resolution under visible light.
As shown in FIG. 6, the optical transfer function (MTF) curve of the lens in the wide-angle state of infrared light (800-1000 nm) is shown, the abscissa thereof is the resolution, the unit is 1p/mm, and the ordinate thereof is the MTF value. As shown in fig. 6, the infrared light curve smoothly drops and concentrates. At 250p/mm, the MTF value can still be ensured to be larger than 0.2, and the whole MTF value is equivalent to that in a visible light state.
Other constructions and operations of a lens according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (4)
1. A lens comprises a first lens group (G1), a second lens group (G2), a third lens group (G3), a fourth lens group (G4), a light splitting device (140), a light filtering device (150) and an identification device (160), wherein the first lens group (G1), the second lens group (G2), the third lens group (G3), the fourth lens group (G4), the light splitting device (140), the light filtering device (150) and the identification device (160) are sequentially arranged between an object side and an imaging side,
The light splitting device (140) is arranged between the fourth lens group (G4) and the light filtering device (150), an inlet of the light splitting device (140) is connected with an outlet of the fourth lens group (G4), an outlet of the light splitting device (140) is connected with an inlet of the light filtering device (150), and the light splitting device is used for splitting a light beam at the outlet of the fourth lens group (G4) into a horizontal light beam and a vertical light beam and independently sending the horizontal light beam and the vertical light beam to the light filtering device (150);
The filtering device (150) is arranged between the beam splitting device (140) and the identification device (160) and is used for receiving the horizontal light beam and the vertical light beam, filtering the horizontal light beam and the vertical light beam, and independently transmitting the filtered horizontal light beam and vertical light beam to the identification device (160);
-said identification means (160) for receiving and identifying said filtered horizontal and vertical beams;
The first lens group (G1) comprises a first lens (100) and a second lens (200), wherein the first lens (100) and the second lens (200) are both negative-power lenses, the shapes of the first lens (100) and the second lens (200) are crescent shapes, the convex side of the first lens (100) faces the object side, and the concave side of the first lens (100) faces the convex side of the second lens (200);
the first lens (100) satisfies the following condition:
-44<f(100)<-25;
1.7<D1/R2<1.82;
1.7<Nd1<1.8;
Wherein f (100) is a focal length of the first lens (100), nd 1 is a refractive index of the first lens (100), D 1 is a diameter of a concave side of the first lens (100), and R 2 is a radius of curvature of the concave side of the first lens (100);
The second lens group (G2) comprises a third lens (300) and a fourth lens (400), wherein edges of the third lens (300) and the fourth lens (400) are glued to form a negative power lens, the third lens (300) is crescent-shaped, the fourth lens (400) is a biconcave lens, the concave side of the third lens (300) faces the concave side of the second lens (200), the convex side of the third lens (300) faces the fourth lens (400), and the curvature radius of the fourth lens (400) facing the concave side of the third lens (300) is the same as the curvature radius of the convex side of the third lens (300);
The fourth lens group (G4) comprises a seventh lens (700) and an eighth lens (800), wherein edges of the seventh lens (700) and the eighth lens (800) are glued to form a positive power lens, the seventh lens (700) is a meniscus lens, the eighth lens (800) is a biconvex lens, the convex side of the seventh lens (700) faces the sixth lens (600), the concave side of the seventh lens (700) faces the convex side of the eighth lens (800), and the radius of curvature of the concave side of the seventh lens (700) is the same as the radius of curvature of the convex side of the eighth lens (800).
2. The lens according to claim 1, characterized in that the third lens (300), the sixth lens (600) and the seventh lens (700) fulfil the following condition:
2.6<∣R31/R61+R71∣<4;
Wherein R 31 is a radius of curvature of the concave side of the third lens (300), R 61 is a radius of curvature of the sixth lens (600) toward the fifth lens (500), and R 71 is a radius of curvature of the convex side of the seventh lens (700).
3. A lens according to claim 2, characterized in that the first lens (100) and the seventh lens (700) fulfil the following condition:
R12＞R72;
Wherein R 12 is a radius of curvature of the concave side of the first lens (100), and R 72 is a radius of curvature of the concave side of the seventh lens (700).
4. A lens barrel according to claim 3, wherein the fourth lens group (G4) further comprises a ninth lens (900) and a tenth lens (110), wherein,
The edges of the ninth lens (900) and the tenth lens (110) are glued to form a negative power lens, the ninth lens (900) is a biconcave lens, the tenth lens (110) is a biconvex lens, and the radius of curvature of the ninth lens (900) toward the concave side of the tenth lens (110) is the same as the radius of curvature of the tenth lens (110) toward the convex side of the ninth lens (900).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010771779.2A CN111929811B (en) | 2020-08-04 | 2020-08-04 | A lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010771779.2A CN111929811B (en) | 2020-08-04 | 2020-08-04 | A lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111929811A CN111929811A (en) | 2020-11-13 |
| CN111929811B true CN111929811B (en) | 2025-01-10 |
Family
ID=73307223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010771779.2A Active CN111929811B (en) | 2020-08-04 | 2020-08-04 | A lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111929811B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212723504U (en) * | 2020-08-04 | 2021-03-16 | 湖北禾口光电有限公司 | Lens |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI431317B (en) * | 2011-12-15 | 2014-03-21 | Young Optics Inc | Lens module and image apparatus |
| CN104871061B (en) * | 2012-12-21 | 2017-03-08 | 富士胶片株式会社 | Camera lens and camera device |
| CN110058384B (en) * | 2019-05-30 | 2021-08-27 | 浙江大华技术股份有限公司 | Lens |
| CN110542991B (en) * | 2019-08-22 | 2021-07-20 | 浙江大华技术股份有限公司 | Lens |
| CN110749987B (en) * | 2019-10-23 | 2021-07-20 | 浙江大华技术股份有限公司 | Lens |
-
2020
- 2020-08-04 CN CN202010771779.2A patent/CN111929811B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212723504U (en) * | 2020-08-04 | 2021-03-16 | 湖北禾口光电有限公司 | Lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111929811A (en) | 2020-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9690080B2 (en) | Wide angle lens | |
| US7821720B2 (en) | Endoscope objective lens with large entrance pupil diameter and high numerical aperture | |
| EP2490061B1 (en) | Imaging lens, camera and personal digital assistant | |
| EP1387199B1 (en) | Image pickup lens | |
| CN110646920B (en) | A long focal length vehicle-mounted optical lens and its working method | |
| EP2913696A1 (en) | Wide-angle lens | |
| JPH0996759A (en) | Retro-focus type lens | |
| US7558008B2 (en) | Photographing lens unit including plurality of lenses and imaging apparatus with the same | |
| EP3465314B1 (en) | Imaging optical system and imaging apparatus | |
| WO2019093377A1 (en) | Imaging lens system and imaging device | |
| CN109416459A (en) | Endoscope objective optical system | |
| CN108761740A (en) | Ultra-wide angle optical camera lens group | |
| JP4125179B2 (en) | Single focus lens for visible and near infrared light | |
| CN108139568A (en) | Objective lens optical system for endoscope | |
| CN210626769U (en) | an optical imaging lens | |
| CN101339289A (en) | Wide-angle lens | |
| CN212723504U (en) | Lens | |
| CN116699798A (en) | fixed focus imaging lens | |
| EP4137858B1 (en) | Optical imaging lens | |
| CN208654420U (en) | Ultra wide-angle optical camera lens group | |
| CN113376803B (en) | Large-target-surface vehicle-mounted ADAS lens and image pickup device | |
| CN111929811B (en) | A lens | |
| US20050057795A1 (en) | Ultraviolet imaging system | |
| JP2004163986A (en) | Lens system | |
| JPH04163509A (en) | Endoscope object optical system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20241206 Address after: Room 1404, Unit 2, Building 7, Huijing Kailun Garden, No. 187 Houjie Avenue West, Houjie Town, Dongguan City, Guangdong Province, 523000 Applicant after: Dongguan Hengxin Technology Information Co.,Ltd. Country or region after: China Address before: 441800 Huazhong Optoelectronic Industrial Park, south of mengtu Road, laochengcun, Guanghua office, Laohekou City, Xiangyang City, Hubei Province Applicant before: Hubei Hekou photoelectric Co.,Ltd. Country or region before: China |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20250317 Address after: Room 7A27, Building 7, No. 85 Chaoyang Road, Chaoyang District, Beijing 100000 Patentee after: KO FILM RENTAL BEIJING Co.,Ltd. Country or region after: China Address before: Room 1404, Unit 2, Building 7, Huijing Kailun Garden, No. 187 Houjie Avenue West, Houjie Town, Dongguan City, Guangdong Province, 523000 Patentee before: Dongguan Hengxin Technology Information Co.,Ltd. Country or region before: China |
|
| TR01 | Transfer of patent right |