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US20190384042A1 - Lens assembly - Google Patents

Lens assembly Download PDF

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Publication number
US20190384042A1
US20190384042A1 US16/160,987 US201816160987A US2019384042A1 US 20190384042 A1 US20190384042 A1 US 20190384042A1 US 201816160987 A US201816160987 A US 201816160987A US 2019384042 A1 US2019384042 A1 US 2019384042A1
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United States
Prior art keywords
lens
positive
convex
concave
image
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.)
Abandoned
Application number
US16/160,987
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English (en)
Inventor
Ying-Hsiu Lin
Hung-You Cheng
Kuo-Chuan Wang
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.)
Rays Optics Inc
Original Assignee
Rays Optics Inc
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Filing date
Publication date
Application filed by Rays Optics Inc filed Critical Rays Optics Inc
Assigned to RAYS OPTICS INC. reassignment RAYS OPTICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHENG, HUNG-YOU, LIN, YING-HSIU, WANG, KUO-CHUAN
Publication of US20190384042A1 publication Critical patent/US20190384042A1/en
Priority to US17/218,210 priority Critical patent/US11808927B2/en
Abandoned legal-status Critical Current

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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
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • 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
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components

Definitions

  • the invention relates in general to a lens assembly.
  • the lens used in vehicles is a commonly seen lens.
  • higher and higher requirements such as thinness and better optical features, are expected of the lens.
  • the lens basically needs to possess the features of lower cost, higher resolution, larger aperture, larger target surface and lighter weight. Therefore, it has become a prominent task for the industries to provide an image lens having the features of lighter weight, lower manufacturing cost, and better optical quality.
  • a lens assembly including 4 ⁇ 7 lenses with a refractive power.
  • D1 is the diameter of a lens surface farthest away from the image plane of the lens assembly.
  • DL is the diameter of a lens surface closest to the image plane of the lens assembly.
  • LT is the length on an optical axis of the lens from the lens surface farthest away from the image plane of the lens assembly to the lens surface closest to the image plane of the lens assembly.
  • the lens assembly satisfies the following conditions: (1) 6 mm ⁇ DL ⁇ 20 mm, 1.5 ⁇ LT/DL ⁇ 2.4 and D1/DL>0.6 or (2) 6 mm ⁇ DL ⁇ 20 mm, 1.25 ⁇ LT/DL ⁇ 1.7 and D1/DL>0.4.
  • the lens includes 4 ⁇ 7 lenses which can be divided into a front lens group and a rear lens group.
  • the rear lens group includes an aspheric lens.
  • a lens assembly including a combined lens, a spherical lens and an aspheric lens.
  • the combined lens is formed of two lenses and includes corresponding adjacent surfaces whose radii of curvature are substantially identical.
  • the aspheric lens is closer to the image plane of the lens assembly than the combined lens. At most one lens is disposed between the aspheric lens and the image plane of the lens assembly.
  • the lens includes 4 ⁇ 7 lenses with a refractive power.
  • DFOV is the diagonal field of view of the lens.
  • DL is the diameter of a lens surface closest to the image plane of the lens assembly.
  • LT is the length on an optical axis of the lens from a lens surface farthest away from the image plane of the lens assembly to the lens surface closest to the image plane of the lens assembly.
  • the lens assembly satisfies the following conditions: 40° ⁇ DFOV ⁇ 60°, 6 mm ⁇ DL ⁇ 20 mm, 1.5 ⁇ LT/DL ⁇ 2.4.
  • the lens includes 4 ⁇ 7 lenses including a spherical lens, a combined lens and an aspheric lens.
  • a lens assembly including a combined lens, a spherical lens and an aspheric lens.
  • the combined lens is formed of two lenses and includes corresponding adjacent surfaces whose radii of curvature are substantially identical.
  • the aspheric lens is closer to the image plane of the lens assembly than the combined lens. At most one lens is disposed between the aspheric lens and the image plane of the lens assembly.
  • the lens includes 4 ⁇ 7 lenses with a refractive power.
  • the Abbe number of at least one lens of the combined lens and the Abbe number of the aspheric lens both are greater than 60.
  • the surface of the aspheric lens facing the image plane of the lens assembly on the lens optical path is protruded towards the image plane of the lens assembly.
  • the lens includes 4 ⁇ 7 lenses including a spherical lens, a combined lens and an aspheric lens.
  • a spherical lens including a spherical lens, a combined lens and an aspheric lens.
  • an image lens possessing the optical features of excellent optical quality and light weight and capable of reducing manufacturing cost and improving optical quality is provided.
  • FIG. 1 is a schematic diagram of a lens assembly 10 a according to a first embodiment of the present invention.
  • FIGS. 2 ⁇ 3 respectively are a ray fan plot and a longitudinal aberration graph of the lens assembly 10 a.
  • FIG. 4 is a schematic diagram of a lens assembly 10 b according to a second embodiment of the present invention.
  • FIGS. 5 ⁇ 6 respectively are a ray fan plot and a longitudinal aberration graph of the lens assembly 10 b.
  • FIG. 7 is a schematic diagram of a lens assembly 10 c according to a third embodiment of the present invention.
  • FIGS. 8 ⁇ 9 respectively are a ray fan plot and a longitudinal aberration graph of the lens assembly 10 c.
  • FIG. 10 is a schematic diagram of a lens assembly 10 d according to a fourth embodiment of the present invention.
  • FIGS. 11 ⁇ 12 respectively are a ray fan plot and a longitudinal aberration graph of the lens assembly 10 d.
  • FIG. 13 is a schematic diagram of a lens assembly 10 e according to a fifth embodiment of the present invention.
  • FIGS. 14 ⁇ 15 respectively are a ray fan plot and a longitudinal aberration graph of the lens assembly 10 e.
  • FIG. 16 is a schematic diagram of a lens assembly 10 f according to a sixth embodiment of the present invention.
  • FIGS. 17 ⁇ 18 respectively are a ray fan plot and a longitudinal aberration graph of the lens assembly 10 f.
  • optical elements in the present invention refer to the elements partly or completely of reflective or transmissive materials normally including glass or plastics.
  • Examples of the optical elements include lens, prism or aperture.
  • the image magnification side refers to the side of the lens assembly closer to the object to be shot on the optical path
  • image reduction side refers to the side of the lens assembly closer to the sensor on the optical path
  • the image magnification side (or the image reduction side) of a lens has a convex portion (or a concave portion) at a particular area, this implies that the said area is more protruded (or recessed) towards a direction parallel to the optical path than outer area adjacent to the said area.
  • FIG. 1 is a schematic diagram of a lens assembly 10 a according to a first embodiment of the present invention.
  • the lens assembly 10 a includes a lens barrel (not illustrated), within which a first lens L 1 , a second lens L 2 , a third lens L 3 , an aperture 14 and a fourth lens L 4 , a fifth lens L 5 and a sixth lens L 6 are arranged from the first side (the image magnification side/object side/OS) to the second side (the image reduction side/imaging side/IS).
  • the first lens L 1 , the second lens L 2 and the third lens L 3 form a first lens group (such as a front group) 20 with a negative refractive power.
  • the fourth lens L 4 , the fifth lens L 5 and the sixth lens L 6 form a second lens group (such as a rear lens group) 30 with a positive refractive power.
  • a filter 16 and an image sensor are disposed on the image reduction side IS.
  • the image plane of the lens assembly 10 a of a visible light at an effective focal length is designated by 18 .
  • the filter 16 is disposed between the second lens group 30 and the image plane 18 of the lens assembly 10 a of a visible light at an effective focal length.
  • the refractive powers of the first lens L 1 to the sixth lens L 6 sequentially are: positive (+), negative ( ⁇ ), positive, negative, positive, positive, and the sixth lens is an aspheric glass lens.
  • aspheric glass lenses can be replaced by aspheric plastics lenses.
  • the lenses whose adjacent surfaces have substantially identical radius of curvature (the difference in the radius of curvature is less than 0.005 mm) or completely identical radius of curvature can form one combined lens/glued lens/doublet lens/triplet lens.
  • the first lens L 1 and the second lens L 2 form one combined lens
  • the fourth lens L 4 and the fifth lens L 5 also form the other combined lens, but the present invention are not limited thereto.
  • the image magnification side OS is located at the left-hand side and the image reduction side IS is located at the right-hand side, and the similarities are not repeated here.
  • the aperture 14 refers to an aperture stop.
  • the aperture is an independent element or is integrated in other optical elements.
  • the aperture achieves a similar effect by blocking the light on the peripheral part using a mechanism member but keeping the central part permeable to the light.
  • the said mechanism member can be adjustable, which means the position, shape and transparency of the mechanism member can be adjusted.
  • the aperture can limit the optical path by coating an opaque light absorbing material on the surface of the lens but keeping the central part permeable to the light.
  • Each lens has a surface diameter.
  • the surface diameter of a lens refers to the distance (such as surface diameter D), in a direction perpendicular to an optical axis, between two edge turning points P and Q at the two ends of the optical axis 12 of the lens.
  • the surface S 1 has a diameter of 10 mm
  • the surface S 11 has a diameter of 6.2 mm.
  • the aspheric polynomial can be expressed as:
  • columns A-G respectively represent the values of the coefficients of the 4 th , the 6 th , the 8 th , the 10 th , the 12 th , the 14 th , and the 16 th order terms of the spherical polynomial.
  • the data exemplified below are not for limiting the present invention. Any person ordinary skilled in the technology field can make necessary modifications or adjustments to the parameters or setting of the present invention, and the said modifications or adjustments are still within the scope of the present invention.
  • the interval of the surface S 1 is the distance on the optical axis 12 from the surface S 1 to the surface S 2 .
  • the interval of the surface S 2 is the distance on the optical axis 12 from the surface S 2 to the surface S 3 .
  • the interval of the surface S 13 is the distance on the optical axis 12 from the surface S 13 to the image plane 18 of a visible light at an effective focal length.
  • the surface with a * sign is an aspheric surface
  • the surface without the * sign is a spherical surface
  • the radius of curvature refers to the reciprocal of the curvature.
  • the radius of curvature is positive, the sphere center of the lens surface is located at the image reduction side of the lens assembly.
  • the radius of curvature is negative, the sphere center of the lens surface is located at the image magnification side of the lens assembly.
  • the aperture value of the present invention is represented by F/# as indicated in above tables.
  • the image plane is a light valve surface.
  • the image plane refers to the surface of the sensor.
  • the image height IMH is 1 ⁇ 2 of the length of the image circle on the image plane as indicated in above tables.
  • the total length of the lens is represented by LT as indicated in above tables.
  • the total length refers to the distance on the optical axis 12 of the lens assembly 10 a from the optical surface S 1 closest to the image magnification side to the optical surface S 11 closest to the image reduction side.
  • the total length (LT) of the lens is less than 23 mm.
  • the diagonal field of view DFOV refers to the receiving angle of the optical surface S 1 closest to the image magnification end, that is, the field of view measured using the image circle as indicated in above tables.
  • FIGS. 2 ⁇ 3 are based on the simulation data of the lens assembly 10 a of the present embodiment.
  • FIG. 2 is a ray fan plot of a visible light, wherein X axis represents the position at which a ray enters the pupil, Y axis represents a relative value of the position at which the chief ray is projected to an image plane (such as the image plane 18 ).
  • FIG. 3 is a graph of longitudinal aberration of the lens assembly 10 a , wherein the three curves from left to right are generated by an incident light having a wavelength of: 0.486 ⁇ m, 0.588 ⁇ m, 0.656 ⁇ m, respectively.
  • the simulation data as illustrated in FIGS. 2 ⁇ 3 are all within standard ranges and suffice to verify that the lens assembly 10 a of the present embodiment really possesses excellent optical quality.
  • the lens assembly according to an embodiment of the present invention includes a front lens group and a rear lens group.
  • the front group includes two lenses for receiving the light, but the present invention is not limited thereto.
  • the aperture value of the lens is greater than or equivalent to 2.6.
  • the rear group includes a combined lens (a glued lens or a doublet lens) and an aspheric lens for correcting aberration and color aberration.
  • the minimum distance between the two lenses of the doublet lens along the optical axis is less than 0.05 mm.
  • the doublet lens can be replaced by a triplet lens, but the present invention is not limited thereto.
  • Each of the doublet lens, the glued lens, the combined lens, and the triplet lens has corresponding adjacent surfaces whose radii of curvature are substantially identical or similar.
  • the lens includes 4 ⁇ 7 lenses with a refractive power, and at least two lenses have an Abbe number greater than 60.
  • the lens assembly satisfies the following condition: 6 mm ⁇ DL ⁇ 20 mm. In another embodiment, the lens assembly satisfies the following condition: 6.5 mm ⁇ DL ⁇ 19 mm. In an alternate embodiment, the lens assembly satisfies the following condition: 7 mm ⁇ DL ⁇ 18 mm.
  • DL represents the diameter of the lens surface closest to the image plane of the lens assembly, so that the imaging light entering the lens can converge to be near the size of the image sensor, and a better optical effect can be obtained in a finite space.
  • the lens assembly satisfies the following conditions: 0.6 ⁇ D1/DL and 1.5 ⁇ LT/DL ⁇ 2.4. In another embodiment, the lens assembly satisfies the following conditions: 0.62 ⁇ D1/DL and 1.55 ⁇ LT/DL ⁇ 2.35. In an alternate embodiment, the lens assembly satisfies the following conditions: 0.64 ⁇ D1/DL and 1.6 ⁇ LT/DL ⁇ 2.3.
  • D1 is the diameter of a lens surface farthest away from the image plane of the lens assembly.
  • DL is the diameter of a lens surface closest to the image plane of the lens assembly.
  • LT is the distance on the optical axis from the optical surface lens closest to the image magnification side to the optical surface closest to the image reduction side.
  • the lens assembly satisfies the following conditions: 0.4 ⁇ D1/DL and 1.25 ⁇ LT/DL ⁇ 1.7. In another embodiment, the lens assembly satisfies the following conditions: 0.42 ⁇ D1/DL and 1.27 ⁇ LT/DL ⁇ 1.68. In an alternate embodiment, the lens assembly satisfies the following conditions: 0.44 ⁇ D1/DL and 1.29 ⁇ LT/DL ⁇ 1.66.
  • the image sensor corresponds to a better design range of the total length of the lenses.
  • D1 is the diameter of a lens surface farthest away from the image plane of the lens assembly.
  • DL is the diameter of a lens surface closest to the image plane of the lens assembly.
  • LT is the distance on the optical axis from the optical surface lens closest to the image magnification side to the optical surface closest to the image reduction side.
  • FIG. 4 is a schematic diagram of a lens assembly 10 b according to a second embodiment of the present invention.
  • the first lens L 1 and the second lens L 2 form a first lens group (such as a front lens group) 20 with a negative refractive power.
  • the third lens L 3 , the fourth lens L 4 and the fifth lens L 5 form a second lens group (such as a rear lens group) 30 with a positive refractive power.
  • the refractive powers of the first lens L 1 to the fifth lens L 5 of the lens assembly 10 b sequentially are: positive, negative, negative, positive, positive, all lenses are formed of glass, and the fifth lens L 5 is an aspheric lens.
  • the aspheric lens is formed by the glass molding method.
  • aspheric glass lenses can be replaced by aspheric plastics lenses.
  • the third lens L 3 and the fourth lens L 4 also form one combined lens, but the present invention is not limited thereto.
  • the surface S 1 has a diameter of 11.12 mm
  • the surface S 10 has a diameter of 8.68 mm.
  • the design parameters of the lens assembly 10 b and the peripheral elements are listed in Table 3.
  • the interval of the surface S 1 is the distance on the optical axis 12 from the surface S 1 to the surface S 2 .
  • the interval of the surface S 2 is the distance on the optical axis 12 from the surface S 2 to the surface S 3 .
  • the interval of the surface S 12 is the distance on the optical path 12 from the surface S 12 to the image plane 18 of a visible light at an effective focal length.
  • the lens assembly includes at least two lenses whose Abbe numbers are greater than 60.
  • FIGS. 5 ⁇ 6 are based on the simulation data of the lens assembly 10 b of the present embodiment.
  • FIG. 5 is a ray fan plot of a visible light, wherein X axis represents the position at which a ray enters the pupil, Y axis represents a relative value of the position at which the chief ray is projected to an image plane (such as the image plane 18 ).
  • FIG. 6 is a graph of longitudinal aberration of the lens assembly 10 b , wherein the three curves from left to right are generated by an incident light having a wavelength of: 0.486 ⁇ m, 0.588 ⁇ m, 0.656 ⁇ m, respectively.
  • the simulation data as illustrated in FIGS. 5 ⁇ 6 are all within standard ranges and suffice to verify that the lens assembly 10 b of the present embodiment really possesses excellent optical quality.
  • FIG. 7 is a schematic diagram of a lens assembly 10 c according to a third embodiment of the present invention.
  • the first lens L 1 forms a first lens group (such as a front lens group) 20 with a positive refractive power.
  • the second lens L 2 , the third lens L 3 , the fourth lens L 4 and the fifth lens L 5 form one second lens group (such as a rear lens group) 30 with a positive refractive power.
  • the refractive powers of the first lens L 1 to the fifth lens L 5 of the lens assembly 10 c sequentially are: positive, positive, negative, positive, negative, all lenses are formed of glass, and the fifth lens L 5 is an aspheric lens.
  • the aspheric lens is formed by the glass molding method.
  • aspheric glass lenses can be replaced by aspheric plastics lenses.
  • the second lens L 2 and the third lens L 3 also form one combined lens, but the present invention is not limited thereto.
  • the surface S 1 has a diameter of 4.64 mm
  • the surface S 10 has a diameter of 9.58 mm.
  • the design parameters of the lens assembly 10 c and the peripheral elements are listed in Table 5.
  • the interval of the surface S 1 is the distance on the optical axis 12 from the surface S 1 to the surface S 2 .
  • the interval of the surface S 2 is the distance on the optical axis 12 from the surface S 2 to the surface S 3 .
  • the interval of the surface S 12 is the distance on the optical path 12 from the surface S 12 to the image plane 18 of a visible light at an effective focal length.
  • the lens assembly includes at least two lenses whose Abbe numbers are greater than 60.
  • FIGS. 8 ⁇ 9 are based on the simulation data of the lens assembly 10 c of the present embodiment.
  • FIG. 8 is a ray fan plot of a visible light, wherein X axis represents the position at which a ray enters the pupil, Y axis represents a relative value of the position at which the chief ray is projected to an image plane (such as the image plane 18 ).
  • FIG. 9 is a graph of longitudinal aberration of the lens assembly 10 c , wherein the three curves from left to right are generated by an incident light having a wavelength of: 0.486 ⁇ m, 0.588 ⁇ m, 0.656 ⁇ m, respectively.
  • the simulation data as illustrated in FIGS. 8 ⁇ 9 are all within standard ranges and suffice to verify that the lens assembly 10 c of the present embodiment really possesses excellent optical quality.
  • FIG. 10 is a schematic diagram of a lens assembly 10 d according to a fourth embodiment of the present invention.
  • the refractive powers of the first lens L 1 to the fifth lens L 5 of the lens assembly 10 d sequentially are: positive, negative, positive, positive, negative, all lenses are formed of glass, and the fifth lens L 5 is an aspheric lens.
  • the aspheric lens is formed by the glass molding method.
  • aspheric glass lenses can be replaced by aspheric plastics lenses.
  • the second lens L 2 and the third lens L 3 also form one combined lens, but the present invention is not limited thereto.
  • the surface S 1 has a diameter of 4.74 mm
  • the surface S 10 has a diameter of 9.0 mm.
  • the design parameters of the lens assembly 10 d and the peripheral elements are listed in Table 7.
  • the interval of the surface S 1 is the distance on the optical axis 12 from the surface S 1 to the surface S 2 .
  • the interval of the surface S 2 is the distance on the optical axis 12 from the surface S 2 to the surface S 3 .
  • the interval of the surface S 12 is the distance on the optical path 12 from the surface S 12 to the image plane 18 of a visible light at an effective focal length.
  • the lens assembly includes at least two lenses whose Abbe numbers are greater than 58.
  • FIGS. 11 ⁇ 12 are based on the simulation data of the lens assembly 10 d of the present embodiment.
  • FIG. 11 is a ray fan plot of a visible light, wherein X axis represents the position at which a ray enters the pupil, Y axis represents a relative value of the position at which the chief ray is projected to an image plane (such as the image plane 18 ).
  • FIG. 12 is a graph of longitudinal aberration of the lens assembly 10 d , wherein the three curves from left to right are generated by an incident light having a wavelength of: 0.486 ⁇ m, 0.588 ⁇ m, 0.656 ⁇ m, respectively.
  • the simulation data as illustrated in FIGS. 11 ⁇ 12 are all within standard ranges and suffice to verify that the lens assembly 10 d of the present embodiment really possesses excellent optical quality.
  • FIG. 13 is a schematic diagram of a lens assembly 10 e according to a fifth embodiment of the present invention.
  • the refractive powers of the first lens L 1 to the seventh lens L 7 of the lens assembly 10 e sequentially are: negative, positive, positive, negative, positive, positive, negative, and all lenses are spherical glass lenses.
  • the first lens L 1 , the second lens L 2 and the third lens L 3 form a first lens group (such as a front lens group) 20 with a positive refractive power.
  • the fourth lens L 4 , the fifth lens L 5 , the sixth lens L 6 and the seventh lens L 7 form a second lens group (such as a rear lens group) 30 with a positive refractive power.
  • the first lens L 1 and the second lens L 2 also form one combined lens, but the present invention is not limited thereto.
  • the surface S 1 has a diameter of 6.0 mm
  • the surface S 13 has a diameter of 9.2 mm.
  • the design parameters of the lens assembly 10 e and the peripheral elements are listed in Table 9.
  • the interval of the surface S 1 is the distance on the optical axis 12 from the surface S 1 to the surface S 2 .
  • the interval of the surface S 2 is the distance on the optical axis 12 from the surface S 2 to the surface S 3 .
  • the interval of the surface S 16 is the distance on the optical path 12 from the surface S 16 to the image plane 18 of a visible light at an effective focal length.
  • the lens assembly includes at least two lenses whose Abbe numbers are greater than 60.
  • FIGS. 14 ⁇ 15 are based on the simulation data of the lens assembly 10 e of the present embodiment.
  • FIG. 14 is a ray fan plot of a visible light, wherein X axis represents the position at which a ray enters the pupil, Y axis represents a relative value of the position at which the chief ray is projected to an image plane (such as the image plane 18 ).
  • FIG. 15 is a graph of longitudinal aberration of the lens assembly 10 e , wherein the three curves from left to right are generated by an incident light having a wavelength of: 0.486 ⁇ m, 0.588 ⁇ m, 0.656 ⁇ m, respectively.
  • the simulation data as illustrated in FIGS. 14 ⁇ 15 are all within standard ranges and suffice to verify that the lens assembly 10 e of the present embodiment really possesses excellent optical quality.
  • FIG. 16 is a schematic diagram of a lens assembly 10 f according to a sixth embodiment of the present invention.
  • the refractive powers of the first lens L 1 to the sixth lens L 6 of the lens assembly 10 f sequentially are: positive, negative, positive, negative, positive, positive, and lenses L 1 ⁇ L 5 are spherical glass lenses.
  • the first lens L 1 , the second lens L 2 and the third lens L 3 form a first lens group (such as a front lens group) 20 with a negative refractive power.
  • the fourth lens L 4 , the fifth lens L 5 and the sixth lens L 6 form a second lens group (such as a rear lens group) 30 with a positive refractive power.
  • the first lens L 1 and the second lens L 2 form one cemented lens
  • the fourth lens L 4 and the fifth lens L 5 form the other cemented lens but the present invention is not limited thereto.
  • the surface S 1 has a diameter of 10.0 mm
  • the surface S 11 has a diameter of 7.0 mm.
  • the design parameters of the lens assembly 10 f and the peripheral elements are listed in Table 10.
  • the interval of the surface S 1 is the distance on the optical axis 12 from the surface S 1 to the surface S 2 .
  • the interval of the surface S 2 is the distance on the optical axis 12 from the surface S 2 to the surface S 3 .
  • the interval of the surface S 13 is the distance on the optical path 12 from the surface S 13 to the image plane 18 of a visible light at an effective focal length.
  • the lens assembly 10 f includes at least two lenses whose Abbe numbers are greater than 50.
  • FIGS. 17 ⁇ 18 are based on the simulation data of the lens assembly 10 f of the present embodiment.
  • FIG. 17 is a ray fan plot of a visible light, wherein X axis represents the position at which a ray enters the pupil, Y axis represents a relative value of the position at which the chief ray is projected to an image plane (such as the image plane 18 ).
  • FIG. 18 is a graph of longitudinal aberration of the lens assembly 10 f , wherein the three curves from left to right are generated by an incident light having a wavelength of: 0.486 ⁇ m, 0.588 ⁇ m, 0.656 ⁇ m, respectively.
  • the simulation data as illustrated in FIGS. 17 ⁇ 18 are all within standard ranges and suffice to verify that the lens assembly 10 f of the present embodiment really possesses excellent optical quality.
  • an image lens possessing the optical features of excellent optical quality and lightweight and capable of reducing manufacturing cost and improving optical quality is provided.

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TW107120644A TWI768063B (zh) 2018-06-15 2018-06-15 鏡頭及其製造方法

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