CN116520528A - Optical lens - Google Patents

Optical lens Download PDF

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Publication number
CN116520528A
CN116520528A CN202310056525.6A CN202310056525A CN116520528A CN 116520528 A CN116520528 A CN 116520528A CN 202310056525 A CN202310056525 A CN 202310056525A CN 116520528 A CN116520528 A CN 116520528A
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CN
China
Prior art keywords
lens
optical lens
optical
positive
aspheric
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.)
Pending
Application number
CN202310056525.6A
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Chinese (zh)
Inventor
李明燐
陈信德
王国权
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Young Optics Inc
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Young Optics Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Publication of CN116520528A publication Critical patent/CN116520528A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/265—Composite lenses; Lenses with a patch-like shape
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

Abstract

The invention discloses an optical lens applied to a car lamp, which comprises three lenses closest to the amplifying side of the lens, a first lens with positive diopter value, a second lens with negative diopter value and a third lens in sequence. The three lenses at least comprise two aspheric lenses, and diopter values of the two aspheric lenses are positive and negative. The aspherical lens with positive diopter value has the same positive and negative curvature radius in the first direction and the second direction, and the first direction and the second direction are perpendicular to each other. The lens closest to the lens reduction side and having diopter is a spherical glass lens. The field angle of the lens is between 25 degrees and 45 degrees. The lens includes at most 5 lenses.

Description

Optical lens
The present application claims priority from taiwan patent application (application number 111104106) having application date 2022, 1 month and 28 days. The present application refers to the entirety of the taiwan patent application mentioned above.
Technical Field
The present invention relates to an optical lens, and more particularly to an optical lens applicable to a headlight of a vehicle.
Background
The effect of the car lamp is not only to provide the environment state in front of driving identification, but also to provide surrounding personnel with knowledge of the current position of the driver, and to achieve a considerable warning effect. At present, intelligent car lamps are available on the market, which can be adjusted according to the ambient light and the driving condition to reduce the glare to the oncoming car or project an indication picture to assist driving. Therefore, there is a need for an optical lens that can achieve a good resolution and a small amount of distortion while satisfying the illumination range required by traffic regulations.
Disclosure of Invention
Other objects and advantages of the present invention will be further understood from the technical features disclosed in the embodiments of the present invention.
An embodiment of the invention provides an optical lens applicable to a vehicle lamp, which comprises three lenses closest to a lens magnification side, a first lens with positive diopter value, a second lens with negative diopter value and a third lens in sequence. The three lenses at least comprise two aspheric lenses, and diopter values of the two aspheric lenses are positive and negative. The aspherical lens with positive diopter value has the same positive and negative curvature radius in the first direction and the second direction, and the first direction and the second direction are perpendicular to each other. The lens closest to the lens reduction side and having diopter is a spherical glass lens. The field angle of the lens is between 25 degrees and 45 degrees. And the lens includes at most 5 lenses.
Another embodiment of the present invention provides an optical lens assembly including, in order from a lens magnification side to a lens reduction side, a first lens group, an aperture, and a second lens group. The first lens group comprises 1-2 lenses with diopters, wherein the 1-2 lenses with diopters comprise a first aspheric lens. The second lens group comprises 2-3 lenses with diopters, wherein the 2-3 lenses with diopters comprise a second aspheric lens and a spherical glass lens, and the spherical glass lens is the lens closest to the lens reducing side and has diopters. Diopter values of the first aspheric lens and the second aspheric lens are positive and negative. The aspherical lens with positive diopter value has the same positive and negative curvature radius in the first direction and the second direction, and the first direction and the second direction are perpendicular to each other. The lens satisfies the following conditions: 25 degrees < FOV <45 degrees, and FOV is the field angle of the lens; EFL/BFL is 3, EFL is the effective focal length of the lens, BFL is the back focal length of the lens; and the lens includes at most 5 lenses.
Based on the above, the optical lens of the present invention has at least one of the following advantages. By means of the design of the embodiment of the invention, the lens design which meets the requirements of traffic regulations, has the characteristics of illumination range, high resolution, low distortion, miniaturization and the like, and can be applied to the automobile head lamp with lower manufacturing cost and better imaging quality can be provided.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
Fig. 1 is a schematic view of a projection apparatus according to an embodiment of the invention.
Fig. 2 is an optical structure diagram of an optical lens according to a first embodiment of the present invention.
Fig. 3 is an optical structure diagram of an optical lens according to a second embodiment of the present invention.
Fig. 4 is an optical structure diagram of an optical lens according to a third embodiment of the present invention.
Fig. 5 is an optical structure diagram of an optical lens according to a fourth embodiment of the present invention.
Fig. 6 is an optical block diagram of an optical lens according to a fifth embodiment of the present invention.
Fig. 7 is an optical block diagram of an optical lens according to a sixth embodiment of the present invention.
Fig. 8 is an optical structure diagram of an optical lens according to a seventh embodiment of the present invention.
Fig. 9 is an optical structure diagram of an optical lens according to an eighth embodiment of the present invention.
Fig. 10 is an optical block diagram of an optical lens according to a ninth embodiment of the present invention.
Fig. 11 is an optical structure diagram of an optical lens according to a tenth embodiment of the present invention.
Fig. 12 is an optical structure diagram of an optical lens according to an eleventh embodiment of the present invention.
Fig. 13 is an optical structure diagram of an optical lens according to a twelfth embodiment of the present invention.
Fig. 14 is a graph of a modulation transfer function of the optical lens of fig. 2, and fig. 15 is a distortion diagram of the optical lens of fig. 2.
Fig. 16 is a graph of a modulation transfer function of the optical lens of fig. 6, and fig. 17 is a distortion diagram of the optical lens of fig. 6.
Fig. 18 is a graph of a modulation transfer function of the optical lens of fig. 12, and fig. 19 is a distortion diagram of the optical lens of fig. 12.
Fig. 20A and 20B are schematic perspective views illustrating the lens profile according to an embodiment of the present invention.
Detailed Description
The terms "first" and "second" used in the following embodiments are used in conjunction with the detailed description of the embodiments with reference to the drawings, in order to identify the same or similar technical aspects, features and effects of the present invention. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the attached drawings. Thus, the directional terminology is used for purposes of illustration and is not intended to be limiting of the invention. In order to show the features of the present embodiment, only the structure related to the present embodiment is shown, and the remaining structures are omitted.
The lens according to the present invention is a lens comprising a part or all of a transparent material and having a refractive power (power), and is typically composed of glass or plastic. May include general lenses (lens), prisms (prism), diaphragms, cylindrical lenses, biconic lenses, cylindrical array lenses, wedge plates (wedge), or combinations of the foregoing elements.
When the lens is used in a projection system, the magnified side refers to the side of the optical path that is closer to the imaging surface (e.g., screen), and the diminished side refers to the side of the optical path that is closer to the light source or light valve.
The object-side (or image-side) of a lens has a convex (or concave) portion in a region, meaning that the region is more "convex" in a direction parallel to the optical axis (or "concave") than the region radially immediately outside the region.
Fig. 1 is a schematic view of a projection apparatus according to an embodiment of the invention. Referring to fig. 1, a projection apparatus 100 of the present embodiment is applicable to a vehicle lamp and includes an image source 120 and an optical lens 10. The image source 120 includes a light source such as a μ -LED (micro light emitting diode), a laser (laser), or an LED (light emitting diode). In addition, in the present embodiment, a prism 130 (or a reflecting mirror) may be disposed on the reducing side of the optical lens 10, and the image beam I may be deflected by the prism 130 (or the reflecting mirror) and then enter the optical lens 10, so as to obtain the effect of turning the optical path to reduce the space occupied by the entire projection apparatus 100. In one embodiment, the reduced side of the optical lens 10 may be provided with the image source 120 directly facing the optical lens 10, and the image beam I directly enters the optical lens 10 from the image source 120.
Fig. 2 is an optical structure diagram of an optical lens according to a first embodiment of the present invention. Referring to fig. 2, in the present embodiment, the optical lens 10a IS disposed between the lens magnification side OS and the lens reduction side IS, the optical lens 10a has a lens barrel (not shown) in which the lens L1, the lens L2, the diaphragm 14, the lens L3 and the lens L4 are sequentially arranged from the magnification side OS to the reduction side IS, and the image source 120 IS located at a position corresponding to the reduction side IS. In the present embodiment, the optical lens 10a is substantially composed of four lenses, and the refractive powers of the lenses L1 to L4 on the optical axis 12 are positive, negative, positive, and positive, respectively. The lenses L2 and L3 are aspherical plastic lenses, and the lenses L1 and L4 are spherical glass lenses. In the present embodiment, the lens L1 and the lens L2 may form the lens group G1, and the lens L3 and the lens L4 may form the lens group G2 having positive diopter.
According to the design of the embodiment of the invention, the diopter value of the aspheric plastic lens L2 and the diopter value of the aspheric plastic lens L3 are positive and negative. For example, in this example lens L2 has negative diopter and lens L3 has positive diopter, and in other lens designs lens L2 may have positive diopter and lens L3 may have negative diopter. Furthermore, according to the design of the embodiment of the present invention, the positive and negative values of the curvature radius (diopter) of the surface of the aspheric plastic lens L2 in a first direction and a second direction are the same, and the first direction and the second direction are perpendicular to each other, and the positive and negative values of the curvature radius (diopter) of the surface of the aspheric plastic lens L3 in the first direction and the second direction are the same, but the embodiment of the present invention is not limited thereto. For example, as shown in fig. 20A and 20B, the first direction may be the X-axis direction and the second direction may be the Y-axis direction, the positive and negative values of the curvature radius of the surface of the lens shown in fig. 20A in the X-axis direction and the Y-axis direction are the same (both positive), and the positive and negative values of the curvature radius of the surface of the lens shown in fig. 20B in the X-axis direction and the Y-axis direction are the same (both negative).
Furthermore, in the embodiments of the present invention, the number of lenses, the shape and the optical characteristics of the lenses can be designed differently according to practical requirements. The enlargement side OS of each embodiment of the present invention IS disposed on the left side of each drawing, and the image reduction side IS disposed on the right side of each drawing, which will not be repeated.
The Aperture 14 is an Aperture Stop (Aperture Stop), and the Aperture 14 is a separate component, but the invention is not limited thereto, and the Aperture 14 may be integrated with other optical components. In this embodiment, the aperture 14 is similar to the aperture by blocking the peripheral light and leaving the middle portion transparent, and the machine member may be adjustable. By adjustable, it is meant that the position, shape or transparency of the machine element is adjusted. Alternatively, the diaphragm 14 may be coated with an opaque light-absorbing material on the surface of the lens, and the central portion thereof is kept transparent to limit the light path. When the aperture of the diaphragm 14 is larger, the optical lens 10a may correspond to a smaller aperture value (F-number). According to an embodiment of the present invention, the diaphragm 14 may be disposed between the lens closest to the lens magnification side and the lens reduction side.
Spherical lens means that the surfaces of the front and rear of the lens are each part of a spherical surface, and the curvature of the spherical surface is fixed. The lens design parameters and the appearance of the optical lens 10a are shown in table one. However, the following description is not intended to limit the invention, and one skilled in the art will recognize that the parameters or settings may be modified appropriately after referencing the present invention, while still remaining within the scope of the present invention.
Table one describes the values of the optical parameters of the lenses in the optical system, the numbers in the surface numbers represent that the surface is an aspherical surface; otherwise, if no number exists in the surface numbers, the surface numbers are spherical. The radius of curvature, pitch/thickness units in table one are millimeters (mm).
List one
In table one, the radius of curvature (mm) refers to the radius of curvature of the corresponding surface, and the pitch (mm) refers to the linear distance between two adjacent surfaces on the optical axis 12. For example, the distance between the surfaces S1, i.e. the distance between the surfaces S1 and S2, the distance between the surfaces S9, i.e. the distance between the surfaces S9 and S10, is shown in the column for the thickness, refractive index and abbe number of each lens and each optical element, and refer to the values corresponding to the distance, refractive index and abbe number in the column. The surfaces S1 and S2 are both surfaces of the lens L1. The surfaces S3 and S4 are two surfaces of the second lens L2. For values of parameters such as radius of curvature and spacing of the surfaces, please refer to table one, and will not be repeated here.
The radius of curvature refers to the inverse of the curvature. The radius of curvature is positive, and the center of sphere of the lens surface is in the direction of the reduction side of the lens. When the radius of curvature is negative, the center of sphere of the lens surface is in the direction of the enlargement side of the lens, and the convex-concave of each lens is visible in the above table.
The aperture value of this embodiment is represented by F/# (F-number), as indicated in the above table. According to the design of the embodiment of the invention, the aperture value (F-number) of the optical lens can be between 0.4 and 0.86, and the absolute value of the distortion of the optical lens is less than 5%. In the present embodiment, the aperture value (F-number) of the optical lens 10a is 0.59, and the distortion amount is about-3%.
EFL is the effective focal length of the optical lens 10a, and in this embodiment, the effective focal length EFL of the optical lens 10a is 24.4mm, |efl/bfl|=9.57. BFL is the back focal length of an optical lens, and wikipedia explains BFL as described below, "thick lens (lens with a thickness that cannot be ignored), or a system of several lenses or mirrors (such as a camera lens or telescope), the focal length is usually expressed in terms of effective focal length (EFL, effective focal length) to distinguish from the commonly used parameters: … back focal length (BFD) or Back Focal Length (BFL) is the distance from the last optical surface vertex of the system to the back focal point. ", i.e., the spacing of S9 in Table I was 2.55mm. When the optical lens is used as an image capturing lens, BFL is the distance from the vertex of the optical surface of the optical lens closest to the reduction side of the lens to the rear imaging surface, and at this time, the object distance of the lens is set to infinity or zero-degree parallel light is incident on the optical lens on the magnification side of the lens. The optical lens of the embodiment of the invention can meet the condition of |EFL/BFL| >3.8, and can avoid excessive reduction of imaging resolution under a large aperture when meeting the condition, and is preferably |EFL/BFL| >4.5, and more preferably |EFL/BFL| >5.
The full field angle FOV refers to the angle of acceptance of the optical surface S1 closest to the magnification side OS, i.e., the field of view (full field of view) measured diagonally. According to the design of the embodiment of the invention, the full view angle can be more than 25 degrees and less than 45 degrees, preferably more than 26 degrees and less than 42 degrees, and more preferably more than 28 degrees and less than 40 degrees. In the present embodiment, the full field angle FOV of the optical lens 10a is 31.6 degrees. According to the design of the embodiment of the invention, the Total Length (TTL) of the optical lens is smaller than 90mm, namely the distance from the vertex of the optical surface of the optical lens closest to the lens magnification side to the rear imaging surface (image source).
According to the embodiment of the invention, the refractive index of the first aspheric plastic lens L1 and the second aspheric plastic lens L2 can be between 1.47 and 1.6, preferably between 1.50 and 1.6, and more preferably between 1.57 and 1.6. The material of the aspherical plastic lens may be, for example, polymethyl methacrylate (PMMA) or Polycarbonate (PC).
Spherical lens means that the surfaces of the front and rear of the lens are each part of a spherical surface, and the curvature of the spherical surface is fixed. The aspheric lens refers to at least one of the front and rear surfaces of the lens, wherein the radius of curvature of at least one surface varies along with the central axis, and can be used for correcting aberration. In the following embodiments of the present invention, the aspherical polynomial may be expressed by the following formula:
in the above formula, Z is the offset (sag) in the direction of the optical axis, c is the inverse of the radius of the sphere of revolution (osculating sphere), i.e., the inverse of the radius of curvature near the optical axis, k is the conic coefficient (conic), and r is the aspherical height, i.e., the height from the center of the lens to the edge of the lens. A-G of Table II represents the coefficient values of the 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order and 16 th order of the aspherical polynomial respectively. However, the following description is not intended to limit the invention, and one skilled in the art will recognize that the parameters or settings may be modified appropriately after referencing the present invention, while still remaining within the scope of the present invention.
Watch II
Surface of the body K A B C D E F
S3* -2.023E+00 1.448E-04 -1.088E-06 4.577E-09 -1.105E-11 1.425E-14 -7.650E-18
S4* -8.197E-01 2.260E-04 -9.185E-07 1.724E-09 8.628E-13 -6.872E-15 6.024E-18
S6* 0.000E+00 -1.640E-04 1.142E-06 -6.496E-09 2.051E-11 -3.090E-14 1.740E-17
S7* 0.000E+00 2.381E-05 -2.605E-07 1.941E-09 -9.114E-12 2.298E-14 -2.163E-17
Fig. 14 and 15 are imaging optical simulation data diagrams of the optical lens 10a of fig. 2. Referring to fig. 14, fig. 14 is a graph of modulation transfer function (modulation transfer function, MTF) with the horizontal axis representing spatial frequency per millimeter (spatial frequency in cycles per millimeter) and the vertical axis representing the modulus of the optical transfer function (modulus of the OTF). Fig. 15 is a distortion (displacement) diagram of the optical lens 10a of fig. 2. Since the patterns shown in fig. 14 and 15 are within the required range, it can be verified that the optical lens 10a of the present embodiment can achieve a good imaging effect.
Fig. 3 is an optical structure diagram of an optical lens 10b according to a second embodiment of the present invention. In the present embodiment, the lens L1, the lens L2, the diaphragm 14, the lens L3, the lens L4 and the lens L5 are sequentially arranged from the magnification side OS to the reduction side IS, and the refractive powers of the lenses L1 to L5 on the optical axis 12 are positive, negative, positive and negative, respectively. The lens L2 and the lens L3 are aspheric plastic lenses, and the lens L1, the lens L4 and the lens L5 are spherical glass lenses, and the lens L4 and the lens L5 can form a cemented lens. In the present embodiment, the full field angle FOV of the optical lens 10b is 31.6 degrees, the aperture value (F-number) is 0.59, the effective focal length EFL of the optical lens 10b is 24.4mm, and |efl/bfl|=8.87. In the present embodiment, the lens L1 and the lens L2 may form the lens group G1, and the lens L3, the lens L4 and the lens L5 may form the lens group G2 having positive diopter. The design parameters of the lens and its peripheral elements of the optical lens 10b are shown in table three, and the conic coefficient and the aspherical coefficient of each aspherical surface are shown in table four.
Watch III
Table four
Surface of the body K A B C D E F
S3* -1.650E+00 4.295E-05 -1.528E-07 6.902E-10 -1.986E-12 2.766E-15 -1.539E-18
S4* -8.864E-01 9.630E-05 -6.055E-08 -1.408E-10 1.105E-12 -2.437E-15 1.686E-18
S6* 0.000E+00 -1.049E-04 5.060E-07 -2.158E-09 6.768E-12 -1.130E-14 7.863E-18
S7* 0.000E+00 -4.509E-05 2.082E-07 -1.073E-09 4.042E-12 -7.751E-15 6.466E-18
Fig. 4 is an optical structure diagram of an optical lens 10c according to a third embodiment of the present invention. In the present embodiment, the optical lens 10c sequentially arranges the lens L1, the lens L2, the aperture 14, the lens L3, and the lens L4 from the magnification side OS to the reduction side IS, and the refractive powers of the lens L1 to the lens L4 on the optical axis 12 are positive, negative, positive, and positive, respectively. The lens L2 and the lens L3 are aspherical plastic lenses, and the lens L1 and the lens L4 are spherical glass lenses. In the present embodiment, the lens L1 and the lens L2 may form the lens group G1, and the lens L3 and the lens L4 may form the lens group G2 having positive diopter. In the present embodiment, the full field angle FOV of the optical lens 10c is 31.8 degrees, the aperture value (F-number) is 0.6, the effective focal length EFL of the optical lens 10c is 24.4mm, |efl/bfl|=8.53. The design parameters of the lens and its peripheral elements of the optical lens 10c are shown in table five, and the conic coefficients and aspheric coefficients of the respective aspheric surfaces are shown in table six.
TABLE five
TABLE six
Fig. 5 is an optical structure diagram of an optical lens 10d according to a fourth embodiment of the present invention. In the present embodiment, the optical lens 10d sequentially arranges the lens L1, the lens L2, the aperture 14, the lens L3, and the lens L4 from the magnification side OS to the reduction side IS, and the refractive powers of the lens L1 to the lens L4 on the optical axis 12 are positive, negative, positive, and positive, respectively. The lens L2 and the lens L3 are aspherical plastic lenses, and the lens L1 and the lens L4 are spherical glass lenses. In the present embodiment, the lens L1 and the lens L2 may form the lens group G1, and the lens L3 and the lens L4 may form the lens group G2 having positive diopter. In the present embodiment, the full field angle FOV of the optical lens 10d is 31.8 degrees, the aperture value (F-number) is 0.59, the effective focal length EFL of the optical lens 10d is 24.5mm, |efl/bfl|=10.21. The design parameters of the lens and its peripheral elements of the optical lens 10d are shown in table seven, and the conic coefficients and aspherical coefficients of the respective aspherical surfaces are shown in table eight.
Watch seven
Table eight
Surface of the body K A B C D E F
S3* -3.711E+00 1.063E-05 7.840E-09 -2.020E-10 8.543E-13 -1.678E-15 1.257E-18
S4* -1.167E+01 -4.544E-05 5.305E-07 -2.760E-09 8.160E-12 -1.307E-14 8.686E-18
S6* -1.668E+00 -9.509E-05 2.973E-06 -2.819E-08 1.634E-10 -5.141E-13 6.149E-16
S7* -1.361E+00 7.972E-05 2.836E-06 -5.527E-08 6.304E-10 -3.647E-12 7.770E-15
Fig. 6 is an optical structure diagram of an optical lens 10e according to a fifth embodiment of the present invention. In the present embodiment, the optical lens 10e sequentially arranges the lens L1, the lens L2, the aperture 14, the lens L3, and the lens L4 from the magnification side OS to the reduction side IS, and the refractive powers of the lens L1 to the lens L4 on the optical axis 12 are positive, negative, positive, and positive, respectively. The lens L2 and the lens L3 are aspherical plastic lenses, and the lens L1 and the lens L4 are spherical glass lenses. In the present embodiment, the lens L1 and the lens L2 may form the lens group G1, and the lens L3 and the lens L4 may form the lens group G2 having positive diopter. In the present embodiment, the full field angle FOV of the optical lens 10e is 31.6 degrees, the aperture value (F-number) is 0.59, the effective focal length EFL of the optical lens 10e is 24.5mm, |efl/bfl|=10.34. The design parameters of the lens of the optical lens 10e and its peripheral elements are shown in table nine, and the conic coefficients and aspherical coefficients of the respective aspherical surfaces are shown in table ten.
Table nine
Ten meters
Surface of the body K A B C D E F
S3* -3.570E+00 -3.423E-05 3.742E-07 -1.869E-09 5.715E-12 -9.559E-15 6.555E-18
S4* -7.270E+00 -1.143E-04 1.068E-06 -5.187E-09 1.519E-11 -2.422E-14 1.599E-17
S6* -1.330E+00 -8.178E-05 5.802E-07 2.345E-09 -3.650E-11 1.535E-13 -2.293E-16
S7* -1.500E+00 3.060E-05 1.242E-06 -1.482E-08 1.516E-10 -7.559E-13 1.228E-15
Fig. 16 and 17 are imaging optical simulation data diagrams of the optical lens 10e of fig. 6. Fig. 16 is a graph (modulation transfer function, MTF) of the modulation transfer function of the optical lens 10e of fig. 6, and fig. 17 is a distortion (displacement) graph of the optical lens 10e of fig. 6. Since the patterns shown in fig. 16 and 17 are within the required range, it can be verified that the optical lens 10e of the present embodiment can achieve a good imaging effect.
Fig. 7 is an optical structure diagram of an optical lens 10f according to a sixth embodiment of the present invention. In the present embodiment, the optical lens 10f sequentially arranges the lens L1, the lens L2, the aperture 14, the lens L3, and the lens L4 from the magnification side OS to the reduction side IS, and the refractive powers of the lens L1 to the lens L4 on the optical axis 12 are positive, negative, positive, and positive, respectively. The lens L1, the lens L2 and the lens L3 are aspherical plastic lenses, and the lens L4 is a spherical glass lens. In the present embodiment, the lens L1 and the lens L2 may form the lens group G1, and the lens L3 and the lens L4 may form the lens group G2 having positive diopter. In the present embodiment, the full field angle FOV of the optical lens 10F is 32 degrees, the aperture value (F-number) is 0.6, the effective focal length EFL of the optical lens 10F is 24.5mm, |efl/bfl|=9.01. The design parameters of the lens and its peripheral elements of the optical lens 10f are shown in table eleven, and the conic coefficients and aspherical coefficients of the respective aspherical surfaces are shown in table twelve.
Table eleven
Twelve watches
Surface of the body K A B C D E F
S1* -9.111E-03 2.191E-06 -8.511E-09 2.295E-12 8.174E-15 0 0
S2* -9.356E+00 3.620E-06 -2.424E-08 5.162E-11 -3.680E-14 0 0
S3* -3.341E+00 -2.340E-05 2.553E-07 -1.108E-09 2.701E-12 -3.561E-15 1.954E-18
S4* -4.554E+00 -4.423E-05 5.157E-07 -2.510E-09 6.972E-12 -1.047E-14 6.520E-18
S6* -1.011E+00 -1.164E-05 -2.725E-07 9.143E-09 -5.161E-11 4.466E-14 8.261E-17
S7* -1.103E+00 -2.827E-04 8.375E-06 -1.037E-07 8.840E-10 -4.793E-12 1.075E-14
Fig. 8 is an optical structure diagram of an optical lens 10g according to a seventh embodiment of the present invention. In the present embodiment, the optical lens 10g sequentially arranges the lens L1, the lens L2, the aperture 14, the lens L3, and the lens L4 from the magnification side OS to the reduction side IS, and the refractive powers of the lens L1 to the lens L4 on the optical axis 12 are positive, negative, positive, and positive, respectively. The lens L2 and the lens L3 are aspheric plastic lenses, and the lens L1 and the lens L4 are spherical glass lenses. In the present embodiment, the lens L1 and the lens L2 may form the lens group G1, and the lens L3 and the lens L4 may form the lens group G2 having positive diopter. In the present embodiment, the full field angle FOV of the optical lens 10F is 31.8 degrees, the aperture value (F-number) is 0.6, the effective focal length EFL of the optical lens 10F is 24.5mm, |efl/bfl|=10.04. The design parameters of the lens and its peripheral elements of the optical lens 10g are shown in table thirteen, and the conic coefficient and aspherical coefficient of each aspherical surface are shown in table fourteen.
Watch thirteen
Fourteen watch
Fig. 9 is an optical structure diagram of an optical lens 10h according to an eighth embodiment of the present invention. In the present embodiment, the optical lens 10h sequentially arranges the lens L1, the lens L2, and the lens L3 from the magnification side OS to the reduction side IS, and the refractive powers of the lens L1 to the lens L3 on the optical axis 12 are positive, negative, and positive, respectively. The lens L1 and the lens L2 are aspheric plastic lenses, and the lens L3 is a spherical glass lens. In the present embodiment, the diaphragm 14 is located on the surface S1 of the lens L1. In the present embodiment, the full field angle FOV of the optical lens 10h is 35.2 degrees, the aperture value (F-number) is 0.65, the effective focal length EFL of the optical lens 10h is 21.9mm, and |efl/bfl|=5.43. The design parameters of the lens and its peripheral elements of the optical lens 10h are shown in table fifteen, and the conic coefficients and aspherical coefficients of the respective aspherical surfaces are shown in table sixteen.
Table fifteen
Sixteen watch
Fig. 10 is an optical structure diagram of an optical lens 10i according to a ninth embodiment of the present invention. In the present embodiment, the optical lens 10i sequentially arranges the lens L1, the lens L2, the lens L3, the lens L4 and the lens L5 from the magnification side OS to the reduction side IS, and the refractive powers of the lens L1 to the lens L5 on the optical axis 12 are positive, negative, positive, negative and positive, respectively. The lens L1 and the lens L2 are aspheric plastic lenses, and the lens L3, the lens L4 and the lens L5 are spherical glass lenses, and the lens L4 and the lens L5 can form a cemented lens. In the present embodiment, the diaphragm 14 is located on the surface S4 of the lens L2. In the present embodiment, the full field angle FOV of the optical lens 10i is 31.2 degrees, the aperture value (F-number) is 0.59, the effective focal length EFL of the optical lens 10i is 24mm, and |efl/bfl|=4.6. In the present embodiment, the lens L1 and the lens L2 may form the lens group G1, and the lens L3, the lens L4 and the lens L5 may form the lens group G2 having positive diopter. Design parameters of the lens and peripheral elements of the optical lens 10i are shown in table seventeen, and cone coefficients and aspherical coefficients of the respective aspherical surfaces are shown in table eighteen.
Seventeen of the table
Watch eighteen
Surface of the body K A B C D E F G
S1* 9.900E+01 1.404E-05 -1.858E-07 1.155E-09 -4.325E-12 9.407E-15 -1.036E-17 4.536E-21
S2* -5.483E+00 -1.244E-05 3.247E-08 2.114E-10 -2.421E-12 1.013E-14 -1.976E-17 1.577E-20
S3* -6.998E-01 -3.696E-04 2.862E-06 -2.083E-08 1.007E-10 -3.056E-13 5.199E-16 -3.815E-19
S4* -2.194E+00 3.636E-06 -3.307E-07 2.193E-09 -8.343E-12 1.974E-14 -2.654E-17 1.534E-20
Fig. 11 is an optical structure diagram of an optical lens 10j according to a tenth embodiment of the present invention. In the present embodiment, the optical lens 10j sequentially arranges the lens L1, the lens L2, the lens L3 and the lens L4 from the magnification side OS to the reduction side IS, and the refractive powers of the lens L1 to the lens L4 on the optical axis 12 are positive, negative, positive and positive, respectively. The lens L1 and the lens L2 are aspheric plastic lenses, and the lens L3 and the lens L4 are spherical glass lenses. In the present embodiment, the lens L1 forms a lens group G1, and the lens L2, the lens L3 and the lens L4 form a lens group G2 with positive diopter. In the present embodiment, the diaphragm 14 is located on the surface S3 of the lens L2. In the present embodiment, the full field angle FOV of the optical lens 10j is 30.4 degrees, the aperture value (F-number) is 0.61, the effective focal length EFL of the optical lens 10j is 24mm, |efl/bfl|=4.54. The design parameters of the lens of the optical lens 10j and its peripheral elements are shown in table nineteenth, and the conic coefficients and aspherical coefficients of the respective aspherical surfaces are shown in table twenty.
Nineteen table
Watch twenty
Surface of the body K A B C D E F
S1* -9.900E+01 3.659E-05 -3.120E-07 1.490E-09 -4.404E-12 6.986E-15 -4.251E-18
S2* -8.121E-01 1.520E-04 -7.866E-07 3.076E-09 -7.328E-12 9.251E-15 -4.172E-18
S3* -4.722E+00 -6.066E-05 2.143E-07 -2.332E-10 -6.189E-13 1.482E-15 -2.263E-19
S4* -1.802E+00 -5.101E-05 3.964E-07 -1.535E-09 3.406E-12 -3.715E-15 0.000E+00
Fig. 12 is an optical structure diagram of an optical lens 10k according to an eleventh embodiment of the present invention. In the present embodiment, the optical lens 10k sequentially arranges the lens L1, the lens L2, the lens L3, and the lens L4 from the magnification side OS to the reduction side IS, and the refractive powers of the lens L1 to the lens L4 on the optical axis 12 are positive, negative, positive, and positive, respectively. The lens L1 and the lens L2 are aspheric plastic lenses, and the lens L3 and the lens L4 are spherical glass lenses. In the present embodiment, the lens L1 forms a lens group G1, and the lens L2, the lens L3 and the lens L4 form a lens group G2 with positive diopter. In the present embodiment, the diaphragm 14 is located on the surface S3 of the lens L2. In the present embodiment, the full field angle FOV of the optical lens 10k is 31.8 degrees, the aperture value (F-number) is 0.85, the effective focal length EFL of the optical lens 10k is 33mm, |efl/bfl|=5.53. Design parameters of the lens and peripheral elements of the optical lens 10k are shown in table twenty-first, and cone coefficients and aspherical coefficients of the respective aspherical surfaces are shown in table twenty-second.
Twenty-one of the table
/>
Twenty-two watch
Surface of the body K A B C D E F
S1* -3.338E-01 5.677E-06 -3.072E-08 1.495E-10 -4.611E-13 7.085E-16 -5.196E-19
S2* -9.470E+00 1.115E-05 -1.258E-08 -1.043E-13 -7.534E-14 1.672E-16 -1.424E-19
S3* -9.270E+00 -3.546E-06 -5.426E-08 2.821E-10 -6.253E-13 -6.958E-16 3.165E-18
S4* -2.154E+00 -1.495E-05 9.798E-08 -2.133E-11 -4.091E-12 2.123E-14 -3.339E-17
Fig. 18 and 19 are imaging optical simulation data diagrams of the optical lens 10k of fig. 12. Fig. 18 is a graph (modulation transfer function, MTF) of the modulation transfer function of the optical lens 10k of fig. 12, and fig. 19 is a graph of distortion (displacement) of the optical lens 10k of fig. 12. Since the patterns shown in fig. 18 and 19 are within the required range, it can be verified that the optical lens 10k of the present embodiment can achieve a good imaging effect.
Fig. 13 is an optical structure diagram of an optical lens 10l according to a twelfth embodiment of the present invention. In the present embodiment, the optical lens 10L includes a lens L1, a lens L2, an aperture 14, a lens L3, a lens L4 and a lens L5 sequentially arranged from an enlargement side OS to a reduction side IS, and refractive powers of the lens L1 to the lens L5 on an optical axis 12 are positive, negative, positive and negative, respectively. The lens L2 and the lens L3 are aspheric plastic lenses, and the lens L1, the lens L4 and the lens L5 are spherical glass lenses, and the lens L4 and the lens L5 can form a cemented lens. In the present embodiment, the full field angle FOV of the optical lens 10i is 31.8 degrees, the aperture value (F-number) is 0.6, the effective focal length EFL of the optical lens 10i is 24.2mm, and |efl/bfl|=6.95. In the present embodiment, the lens L1 and the lens L2 may form the lens group G1, and the lens L3, the lens L4 and the lens L5 may form the lens group G2 having positive diopter. Design parameters of the lens and peripheral elements of the optical lens 10l are shown in twenty-third table, and cone coefficients and aspherical coefficients of the respective aspherical surfaces are shown in twenty-fourth table.
Twenty-third table
Twenty-four of the table
The embodiment of the invention can provide lower manufacturing cost but still has good imaging quality by making the material of at least two lenses of the first lens L1, the second lens L2 and the third lens L3 be plastic and be an aspheric lens, and in addition, the aim of low manufacturing cost can be achieved by making the optical lens substantially composed of 3 to 5 lenses. In addition, the lens close to the shrinking side is selected to be made of glass materials, so that the lens has a wider working temperature range. In summary, the optical lens of the present invention has at least one of the following advantages: by means of the design of the embodiment of the invention, the lens design which meets the requirements of traffic regulations, has the characteristics of illumination range, high resolution, low distortion, miniaturization and the like, and can be applied to the automobile head lamp with lower manufacturing cost and better imaging quality can be provided.
While the invention has been described with respect to preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention, and that any such changes and modifications as described in the above embodiments are intended to be within the scope of the invention.

Claims (10)

1. An optical lens applied to a car lamp, comprising:
the three lenses closest to the amplifying side of the optical lens are a first lens with positive diopter value, a second lens with negative diopter value and a third lens in sequence, and the optical lens comprises at most 5 lenses;
the three lenses at least comprise a first aspheric lens and a second aspheric lens, and diopter values of the first aspheric lens and the second aspheric lens are positive and negative;
the positive and negative values of the curvature radius of the first aspheric lens or the second aspheric lens with positive diopter value in a first direction and a second direction are the same, and the first direction and the second direction are mutually perpendicular;
the lens closest to the shrinking side of the optical lens and having diopter is a spherical glass lens; and
the angle of view of the optical lens is greater than 25 degrees and less than 45 degrees.
2. An optical lens, the optical lens comprising:
the optical lens comprises a first lens group, an aperture and a second lens group in sequence from the optical lens enlarging side to the optical lens reducing side;
the first lens group comprises 1-2 lenses with diopters, and the 1-2 lenses with diopters comprise a first aspheric lens;
the second lens group comprises 2-3 lenses with diopters, wherein the 2-3 lenses with diopters comprise a second aspheric lens and a spherical glass lens, and the spherical glass lens is the lens closest to the optical lens shrinking side and has diopters;
diopter values of the first aspheric lens and the second aspheric lens, one is positive and the other is negative;
the positive and negative values of the curvature radius of the first aspheric lens or the second aspheric lens with positive diopter value in a first direction and a second direction are the same, and the first direction and the second direction are mutually perpendicular;
the optical lens satisfies the following conditions:
25 degrees < the field angle of the optical lens <45 degrees;
the effective focal length of the optical lens/the back focal length of the optical lens is 3.8; and
the optical lens includes at most 5 lenses.
3. The optical lens of any one of claims 1-2, wherein the optical lens satisfies one of the following conditions: (1) The absolute value of the distortion of the optical lens is less than 5 percent, and (2) the aperture value of the optical lens is between 0.4 and 0.86.
4. The optical lens of any one of claims 1-2, wherein the optical lens satisfies one of the following conditions: (1) The aperture is arranged between the optical lens magnifying side and the third lens, (2) the optical lens reducing side is provided with a prism or a reflecting mirror.
5. The optical lens of any one of claims 1-2, wherein the optical lens satisfies one of the following conditions: the refractive indices of the first aspheric lens and the second aspheric lens are 1.47-1.6, (3) the curvature radius of the surface of the first aspheric lens facing the amplifying side of the optical lens is positive, (4) the curvature radius values of the first aspheric lens and the second aspheric lens in the first direction and the second direction are the same.
6. The optical lens of any of claims 1-2, wherein the optical lens comprises a cemented lens.
7. The optical lens according to any one of claims 1 to 2, wherein the optical lens satisfies one of the following conditions from the optical lens enlargement side to the optical lens reduction side: (1) a biconvex, aspherical, meniscus lens in order from the direction, (2) a biconvex, aspherical, biconvex, biconcave lens in order from the direction, (3) a meniscus, aspherical, meniscus lens in order from the direction, (4) aspherical, meniscus lens in order from the direction, (5) aspherical, biconvex, meniscus lens in order from the direction, (6) aspherical, biconvex, meniscus lenses in order from the direction, (7) aspherical, plano-convex lenses in order from the direction.
8. The optical lens according to any one of claims 1 to 2, wherein the optical lens satisfies one of the following conditions from the optical lens enlargement side to the optical lens reduction side: (1) positive, negative, positive, and positive, respectively, in order from the refractive power of the direction lens, (2) positive, negative, positive, and negative, respectively, in order from the refractive power of the direction lens, (3) positive, negative, and positive, respectively, in order from the refractive power of the direction lens, and (4) positive, negative, and positive, respectively, in order from the refractive power of the direction lens.
9. The optical lens of any of claims 1-2, wherein the optical lens has an overall length of less than 90mm.
10. The optical lens of any one of claims 1-2, wherein the optical lens satisfies one of the following conditions: (1) The first aspheric lens and the second aspheric lens are made of plastic, and the optical lens (2) is of a glass-plastic mixed structure.
CN202310056525.6A 2022-01-28 2023-01-19 Optical lens Pending CN116520528A (en)

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WO2012176433A1 (en) * 2011-06-22 2012-12-27 富士フイルム株式会社 Imaging lens and imaging device
JP6873741B2 (en) * 2017-02-24 2021-05-19 オリンパス株式会社 Imaging device
CN112666676A (en) * 2019-10-15 2021-04-16 曼德电子电器有限公司 Imaging lens and pixel projection imaging device
TWI717218B (en) * 2020-02-27 2021-01-21 揚明光學股份有限公司 Lens and fabrication method thereof and vehicle lamp

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