June 20, 2020
`
`Certification
`
`Park IP Translations
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`TRANSLATOR'S DECLARATION:
`
`I, Jian Zhang, hereby declare under penalty of perjury under the laws of
`the United States of America:
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`That I possess advanced knowledge of the Chinese (Traditional) and English
`languages. The attached Chinese (Traditional) into English translation has been
`translated by me and to the best of my knowledge and belief, it is a true and
`accurate translation of:
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`Taiwan Application No. 102131525
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`I declare that these statements are made with the knowledge that willful false
`statements and the like so made are punishable by fine or imprisonment, or
`both, under Section 1001 of Title 18 of the United States Code.
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`Executed on June 20, 2020
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`Jian Zhang
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`Project Number: JODAY_2006_011
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`15 W. 37th Street 8th Floor
`New York, NY 10018
`212.581.8870
`ParkIP.com
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`Ability Opto-Electronics Technology Co., Ltd.
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`Hung-Kuo Yu
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`Meihua Wang
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`Abstract
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`※ Application Number:
`※ Application Date:
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`※ IPC Classification:
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`Title of the Invention: Thin wide-angle four-piece imaging lens assembly
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`[Chinese]
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`A thin wide-angle four-piece imaging lens assembly comprises a lens set and a fixed
`diaphragm, wherein the lens set comprises, sequentially from an object side to an image side
`along an optical axis, a first lens, a second lens, a third lens, and a fourth lens with the
`refractive power being positive, positive, negative, and positive, the surface of the first lens
`facing the object side and adjacent to the central optical axis is a convex surface, the surface
`of the second lens facing the image side and adjacent to the central optical axis is a convex
`surface, the surface of the third lens facing the object side and adjacent to the central optical
`axis is a concave surface and the surface thereof facing the image side and adjacent to the
`central optical axis is a convex surface, and the surface of the fourth lens facing the image
`side and adjacent to the central optical axis is a concave surface, and the fourth lens has at
`least one inflection point located between the optical axis and the aspherical end point; the
`fixed diaphragm is located between the object side and the second lens and satisfies
`15<HFOV/f<50, wherein HFOV represents one half of a maximum angle of view of the lens
`assembly, and f represents a focal length of the lens assembly; and a higher HFOV value and
`a lower f value can make the volume of the entire lens assembly denser and improve the
`resolving power. Therefore, the present invention has advantages of both compact and thin
`design and high performance.
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`[English]
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`Application Number: 102131525
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`[Representative Image]
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`[The designated representative image in this case] Figure (1).
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`[Brief explanation of component legends in this image]
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`1…….…lens set
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`11……...first lens
`12……...second lens
`13……...third lens
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`14 ………....fourth lens
`2 ……..........fixed diaphragm
`ct1-ct4 …….thickness
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`[If there are chemical formulae in this case, please disclose a chemical formula that
`can best illustrate the features of the invention]:
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`Specification of Invention Patent
`(Please do not alter the format or sequence of this specification)
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`[Title of the Invention] Thin wide-angle four-piece imaging lens assembly
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`[Field of the Invention]
`[0001] The present invention relates to an imaging lens assembly, and in particular to
`a thin wide-angle four-piece imaging lens assembly.
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`[Description of the Prior Art]
`[0002] A conventional imaging lens assembly is an imaging lens assembly adopted in
`an electronic product, such as a mobile phone, a smart phone, a tablet computer, a notebook
`computer, a camera, and the like. With the continuous improvement of electronic products, a
`gradual trend appears toward compact and thin design while achieving high performance. As
`a result, imaging lens assemblies are developed to have thin dimensions and become more
`compact as a whole. On the other hand, to improve the resolving power, imaging lens
`assemblies need to be developed to have a wider angle.
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`[0003] While conventional imaging lens assemblies, such as those according to the
`patents TW201215941A, TW201224568A, and TW201239443A, are disclosed to be four-
`piece imaging lens assemblies, none of the embodiments in the patents further meet the
`requirements for a thin and wide-angle design.
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`[0004] Therefore, in order to enable an electronic device to achieve advantages of
`both compact and thin design and high performance, a wide-angle imaging lens assembly
`having thin dimensions that make the overall assembly more compact and capable of
`improving the resolving power is currently desired on the market.
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`[Summary of the Invention]
`[0005] Therefore, the objective of the present invention is to provide a thin wide-
`angle four-piece imaging lens assembly having thin dimensions that make the overall
`assembly more compact and capable of improving the resolving power.
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`[0006] Accordingly, the thin wide-angle four-piece imaging lens assembly of the
`present invention comprises a lens set and a fixed diaphragm. The lens set includes a first
`lens, a second lens, a third lens, and a fourth lens arranged in sequence from an object side to
`an image side along an optical axis. The first lens has a positive refractive power adjacent to
`the central optical axis and has a convex surface that faces the object side, and the first lens
`has at least one surface that is an aspherical surface. The second lens has a positive refractive
`power adjacent to the central optical axis and has a convex surface that faces the image side,
`and the second lens has at least one surface that is an aspherical surface. The third lens has a
`negative refractive power adjacent to the central optical axis and has a concave surface that
`faces the object side and a convex surface that faces the image side, and the third lens has at
`least one surface that is an aspherical surface. The fourth lens has a positive refractive power
`adjacent to the central optical axis and has a concave surface that faces the image side, both
`surfaces of the fourth lens are aspherical surfaces, and at least one of the two surfaces has at
`least one inflection point located between the optical axis and the aspherical end point. The
`fixed diaphragm is located between the object side and the second lens. Here, the thin wide-
`angle four-piece imaging lens assembly satisfies the following condition:
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`Application Number: 102131525
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`[0007] 15<HFOV/f<50,
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`[0008] wherein HFOV represents one half of a maximum angle of view of the lens
`assembly and has a unit of degree, and f represents a focal length of the thin wide-angle four-
`piece imaging lens assembly and has a unit of millimeter.
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`[0009] The thin wide-angle four-piece imaging lens assembly according to the present
`invention, wherein the thin wide-angle four-piece imaging lens assembly satisfies the
`following condition:
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`[0010] HFOV>35˚.
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`[0011] The thin wide-angle four-piece imaging lens assembly according to the present
`invention, wherein the thin wide-angle four-piece imaging lens assembly satisfies the
`following condition:
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`[0012] f<2.7 mm.
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`[0013] The thin wide-angle four-piece imaging lens assembly according to the present
`invention, wherein the thin wide-angle four-piece imaging lens assembly satisfies the
`following conditions:
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`[0014] Nd3>1.56, and
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`[0015] V3<29,
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`[0016] wherein Nd3 is a refractive index of the third lens, and V3 is a dispersion
`coefficient of the third lens.
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`[0017] The thin wide-angle four-piece imaging lens assembly according to the present
`invention, wherein the thin wide-angle four-piece imaging lens assembly satisfies the
`following conditions:
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`[0018] Nd2<1.56, and
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`[0019] V2>29,
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`[0020] wherein Nd2 is a refractive index of the second lens, and V2 is a dispersion
`coefficient of the second lens.
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`[0021] The thin wide-angle four-piece imaging lens assembly according to the present
`invention, wherein the thin wide-angle four-piece imaging lens assembly satisfies the
`following condition:
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`[0022] 0.8<|f/f3|<2.5,
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`[0023] wherein f3 represents a focal length of the third lens and has a unit of
`millimeter.
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`[0024] The thin wide-angle four-piece imaging lens assembly according to the present
`invention, wherein the thin wide-angle four-piece imaging lens assembly satisfies the
`following conditions:
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`[0025] 0.3<ct1/ct2<2.0, and
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`[0026] 0<ct3/ct4<1.0,
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`[0027] wherein ct1 is a center thickness of the first lens, ct2 is a center thickness of
`the second lens, ct3 is a center thickness of the third lens, and ct4 is a center thickness of the
`fourth lens, all of which have a unit of millimeter.
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`[0028] The present invention achieves the effect that the thin wide-angle four-piece
`imaging lens assembly satisfies 15<HFOV/f<50. A higher value of HFOV represents a wider
`angle of view of the present invention that can increase the resolving power thereof, while a
`lower value of f indicates that the present invention has thin dimensions that make the overall
`assembly more compact. Therefore, the present invention enables an electronic device to
`achieve advantages of both compact and thin design and high performance, thereby achieving
`the objective of the present invention.
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`[Brief Description of the Drawings]
`[0029] Other features and advantages of the present invention will become apparent in
`the following embodiments with reference to the accompanying drawings, wherein:
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`FIG. 1 is a schematic diagram of an optical structure illustrating a first specific
`embodiment of the thin wide-angle four-piece imaging lens assembly according to the present
`invention;
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`FIG. 2 is a schematic diagram illustrating astigmatism aberration and distortion
`aberration of the first specific embodiment;
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`FIG. 3 is a schematic diagram illustrating spherical aberration of the first specific
`embodiment;
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`FIG. 4 is a schematic diagram of an optical structure illustrating a second specific
`embodiment of the thin wide-angle four-piece imaging lens assembly according to the present
`invention;
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`FIG. 5 is a schematic diagram illustrating astigmatism aberration and distortion
`aberration of the second specific embodiment;
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`FIG. 6 is a schematic diagram illustrating spherical aberration of the second specific
`embodiment;
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`FIG. 7 is a schematic diagram of an optical structure illustrating a third specific
`embodiment of the thin wide-angle four-piece imaging lens assembly according to the present
`invention;
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`FIG. 8 is a schematic diagram illustrating astigmatism aberration and distortion
`aberration of the third specific embodiment; and
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`Application Number: 102131525
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`FIG. 9 is a schematic diagram illustrating spherical aberration of the third specific
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`embodiment.
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`[Detailed Description of the Specific embodiments]
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`[0030] Referring to FIG. 1, the thin wide-angle four-piece imaging lens assembly
`according to the present invention comprises a lens set 1, a fixed diaphragm 2, a filter lens 3,
`and an imaging surface 4.
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`[0031] The lens set 1 includes a first lens 11, a second lens 12, a third lens 13, and a
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`fourth lens 14 arranged in sequence from an object side to an image side along an optical axis
`L. The first lens 11 has a positive refractive power adjacent to the central optical axis L and
`has a convex surface that faces the object side, and the first lens 11 has at least one surface
`that is an aspherical surface. The second lens 12 has a positive refractive power adjacent to
`the central optical axis L and has a convex surface that faces the image side, and the second
`lens 12 has at least one surface that is an aspherical surface. The third lens 13 has a negative
`refractive power adjacent to the central optical axis L and has a concave surface that faces the
`object side and a convex surface that faces the image side, and the third lens 13 has at least
`one surface that is an aspherical surface. The fourth lens 14 has a positive refractive power
`adjacent to the central optical axis L and has a concave surface that faces the image side, both
`surfaces of the fourth lens 14 are aspherical surfaces, and at least one of the two surfaces has
`at least one inflection point located between the optical axis L and the aspherical end point.
`The fixed diaphragm 2 is located between the object side and the second lens 12. Here, the
`thin wide-angle four-piece imaging lens assembly satisfies the following conditions:
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`[0036] in which HFOV represents one half of a maximum angle of view of the lens
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`assembly and has a unit of degree, f represents a focal length of the thin wide-angle four-
`piece imaging lens assembly and has a unit of millimeter, f3 is a focal length of the third lens
`13 and has a unit of millimeter, ct1 represents a center thickness of the first lens 11, ct2
`represents a center thickness of the second lens 12, ct3 represents a center thickness of the
`third lens 13, and ct4 represents a center thickness of the fourth lens 14, all of which have a
`unit of millimeter.
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`[0037] More preferably, the thin wide-angle four-piece imaging lens assembly
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`satisfies the following conditions:
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`[0040] wherein the condition (1) indicates that a higher value of HFOV represents a
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`wider angle of view of the present invention that can increase the resolving power thereof,
`while a lower value of f indicates that the present invention has thin dimensions that make the
`overall assembly more compact. The conditions (5) and (6) further describe advantages of the
`wide angle of view and the thin dimensions of the present invention.
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`
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`[0038] HFOV>35°
`[0039] f<2.7 mm
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`(5), and
`(6),
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`Application Number: 102131525
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`6
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`[0032] 15<HFOV/f<50
`[0033] 0.8<|f/f3|<2.5
`[0034] 0.3<ct1/ct2<2.0
`[0035] 0<ct3/ct4<1.0
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`(2),
`(3), and
`(4),
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`[0041] It should be noted that the thin wide-angle four-piece imaging lens assembly
`satisfies the following conditions:
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`[0042] Nd3>1.56
`[0043] V3<29
`[0044] Nd2<1.56
`[0045] V2>29
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`(7),
`(8),
`(9), and
`(10)
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`[0046] wherein Nd3 is a refractive index of the third lens 13, V3 is a dispersion
`coefficient of the third lens 13, Nd2 is a refractive index of the second lens 12, and V2 is a
`dispersion coefficient of the second lens 12. The conditions (7) to (10) describe that the
`refractive power of the third lens 13 is greater than the refractive power of the second lens 12
`according to the present invention.
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`[0047] Moreover, the aspherical surfaces of the present invention satisfy the following
`condition:
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`[0048]
`[0049]
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`(11),
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`[0050] wherein z is a position value of a position at a height of h along the optical axis
`L with reference to a vertex of the surface, k is the conic constant, c is a reciprocal of the
`radius of curvature, and A, B, C, D, E, F, G, H, J, … are high-order aspheric coefficients.
`Surface profiles of the aspherical surfaces are able to correct aberrations, reduce tolerance
`sensitivity, and provide a wide-angle capability for the present invention.
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`[0051] <First Specific Embodiment>
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`[0052] Referring to FIG. 1, FIG. 2, and FIG. 3, parameters of the first specific
`embodiment are as follows: f1=2.19 mm, f2=2.05 mm, f3=−1.16 mm, f4=1.52 mm, f=1.60
`mm, ct1=0.284 mm, ct2=0.368 mm, ct3=0.190 mm, ct4=0.472 mm, and HFOV=44°.
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`[0053] The first specific embodiment satisfies the conditions (1) to (11), where
`HFOV/f=27.5, |f/f3|=1.38, ct1/ct2=0.77, ct3/ct4=0.40, Nd2=1.535, Nd3=1.636, V2=56.07,
`and V3=23.89.
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`[0054] FIG. 2 illustrates astigmatism aberration and distortion aberration of the first
`specific embodiment. FIG. 3 illustrates spherical aberration.
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`[0055]
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`[0056] Aspherical parameters of the first specific embodiment are as follows:
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`[0057]
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`[0058] <Second Specific Embodiment>
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`Application Number: 102131525
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`[0059] Referring to FIG. 3, FIG. 4, and FIG. 5, parameters of the second specific
`embodiment are as follows: f1=2.39 mm, f2=2.08 mm, f3=−1.45 mm, f4=1.85 mm, f=1.60
`mm, ct1=0.276 mm, ct2=0.392 mm, ct3=0.204 mm, ct4=0.450 mm, and HFOV=44°.
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`[0060] The second specific embodiment satisfies the conditions (1) to (11), where
`HFOV/f=27.5, |f/f3|=1.10, ct1/ct2=0.70, ct3/ct4=0.45, Nd2=1.535, Nd3=1.636, V2=56.07,
`and V3=23.89.
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`[0061] FIG. 4 illustrates astigmatism aberration and distortion aberration of the
`second specific embodiment. FIG. 5 illustrates spherical aberration.
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`[0062]
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`[0063] Aspherical parameters of the second specific embodiment are as follows:
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`[0064]
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`[0065] <Third Specific Embodiment>
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`[0066] Referring to FIG. 6, FIG. 7, and FIG. 8, parameters of the third specific
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`embodiment are as follows: f1=2.55 mm, f2=0.86 mm, f3=−0.61 mm, f4=0.98 mm, f=1.13
`mm, ct1=0.239 mm, ct2=0.266 mm, ct3=0.187 mm, ct4=0.429 mm, HFOV=44°.
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`[0067] The third specific embodiment satisfies the conditions (1) to (11), where
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`HFOV/f=39.0, |f/f3|=1.85, ct1/ct2=0.90, ct3/ct4=0.44, Nd2=1.535, Nd3=1.636, V2=56.07,
`and V3=23.89.
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`[0068] FIG. 7 illustrates astigmatism aberration and distortion aberration of the third
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`specific embodiment. FIG. 8 illustrates spherical aberration.
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`[0069]
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`[0070] Aspherical parameters of the third specific embodiment are as follows:
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`[0071]
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`[0072] In summary, the effects achieved by the present invention are as follows:
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`[0073] I. The present invention is characterized in that the thin wide-angle four-piece
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`imaging lens assembly satisfies 15<HFOV/f<50. Moreover, the present invention also
`improves the resolving power, increases the wide angle of view, and reduces the thickness to
`become thinner by satisfying the conditions (2) to (11).
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`[0074] II. A higher value of HFOV represents a wider angle of view of the present
`invention that can increase the resolving power thereof.
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`[0075] III. A lower value of f indicates that the present invention has thin dimensions
`that make the overall assembly more compact.
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`[0076] The present invention enables an electronic device to achieve advantages of
`both compact and thin design and high performance, thereby achieving the objective of the
`present invention.
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`[0077] However, the description above are only preferred embodiments of the present
`invention, which may not be used to limit the scope of the present invention. Any simple
`equivalent variations and modifications made according to the content of the claims and the
`specification of the present invention shall fall within the scope of the present invention
`patent.
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`Application Number: 102131525
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`[Description of Legends]
`[0078]
`1……...lens set
`11…….first lens
`12…….second lens
`13…….third lens
`14…….fourth lens
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`2 …….........fixed diaphragm
`3 ……….....filter lens
`4 ……….....imaging surface
`L ……….....optical axis
`ct1-ct4 ……thickness
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`[Biological material registration]
`Domestic registration information [remarks shall follow the order of registering agency, date,
`and number]
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`Foreign registration information [remarks shall follow the order of registering country,
`agency, date, and number]
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`[Sequence Listing] (please record on a separate page)
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`Claims
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`1. A thin wide-angle four-piece imaging lens assembly, comprising
`a lens set including a first lens, a second lens, a third lens, and a fourth lens arranged
`in sequence from an object side to an image side along an optical axis,
`wherein the first lens has a positive refractive power adjacent to the central optical
`axis and has a convex surface that faces the object side, and the first lens has at least one
`surface that is an aspherical surface,
`the second lens has a positive refractive power adjacent to the central optical axis and
`has a convex surface that faces the image side, and the second lens has at least one surface
`that is an aspherical surface,
`the third lens has a negative refractive power adjacent to the central optical axis and
`has a concave surface that faces the object side and a convex surface that faces the image side,
`and the third lens has at least one surface that is an aspherical surface, and
`the fourth lens has a positive refractive power adjacent to the central optical axis and
`has a concave surface that faces the image side, both surfaces of the fourth lens are aspherical
`surfaces, and at least one of the two surfaces has at least one inflection point located between
`the optical axis and the aspherical end point; and
`a fixed diaphragm located between the object side and the second lens,
`wherein the thin wide-angle four-piece imaging lens assembly satisfies the following
`condition:
`15<HFOV/f<50,
`wherein HFOV represents one half of a maximum angle of view of the lens assembly
`and has a unit of degree, and f represents a focal length of the thin wide-angle four-piece
`imaging lens assembly and has a unit of millimeter.
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`2. The thin wide-angle four-piece imaging lens assembly according to claim 1,
`wherein the thin wide-angle four-piece imaging lens assembly satisfies the following
`condition:
`HFOV>35˚.
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`3. The thin wide-angle four-piece imaging lens assembly according to claim 1,
`wherein the thin wide-angle four-piece imaging lens assembly satisfies the following
`condition:
`f<2.7 mm.
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`4. The thin wide-angle four-piece imaging lens assembly according to claim 1,
`wherein the thin wide-angle four-piece imaging lens assembly satisfies the following
`conditions:
`Nd3>1.56, and
`V3<29,
`wherein Nd3 is a refractive index of the third lens, and V3 is a dispersion coefficient
`of the third lens.
`
`5. The thin wide-angle four-piece imaging lens assembly according to claim 4,
`wherein the thin wide-angle four-piece imaging lens assembly satisfies the following
`conditions:
`Nd2<1.56, and
`V2>29,
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`wherein Nd2 is a refractive index of the second lens, and V2 is a dispersion
`coefficient of the second lens.
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`6. The thin wide-angle four-piece imaging lens assembly according to claim 1,
`wherein the thin wide-angle four-piece imaging lens assembly satisfies the following
`condition:
`
`0.8<|f/f3|<2.5,
`wherein f3 represents a focal length of the third lens and has a unit of millimeter.
`
`
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`7. The thin wide-angle four-piece imaging lens assembly according to claim 1,
`wherein the thin wide-angle four-piece imaging lens assembly satisfies the following
`conditions:
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`0.3<ct1/ct2<2.0, and
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`0<ct3/ct4<1.0,
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`wherein ct1 is a center thickness of the first lens, ct2 is a center thickness of the
`second lens, ct3 is a center thickness of the third lens, and ct4 is a center thickness of the
`fourth lens, all of which have a unit of millimeter.
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`Drawings
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`Application Number: 102131525
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