WO2020103555A1 - 光学成像镜头及成像设备 - Google Patents

光学成像镜头及成像设备

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Publication number
WO2020103555A1
WO2020103555A1 PCT/CN2019/106772 CN2019106772W WO2020103555A1 WO 2020103555 A1 WO2020103555 A1 WO 2020103555A1 CN 2019106772 W CN2019106772 W CN 2019106772W WO 2020103555 A1 WO2020103555 A1 WO 2020103555A1
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WO
WIPO (PCT)
Prior art keywords
lens
optical imaging
imaging lens
object side
optical
Prior art date
Application number
PCT/CN2019/106772
Other languages
English (en)
French (fr)
Inventor
鲍宇旻
张歆越
刘绪明
王克民
曾吉勇
Original Assignee
江西联创电子有限公司
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
Application filed by 江西联创电子有限公司 filed Critical 江西联创电子有限公司
Priority to PL19887441.4T priority Critical patent/PL3865925T3/pl
Priority to EP19887441.4A priority patent/EP3865925B1/en
Priority to KR1020217007350A priority patent/KR102594490B1/ko
Priority to JP2021503533A priority patent/JP7152590B2/ja
Priority to US16/857,173 priority patent/US11550124B2/en
Publication of WO2020103555A1 publication Critical patent/WO2020103555A1/zh

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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
    • 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
    • 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
    • G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/04—Mounting of cameras operative during drive; Arrangement of controls thereof relative to the vehicle
    • 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
    • G02B1/02—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors
    • 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
    • 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
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0087—Simple or compound lenses with index gradient
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B2003/0093—Simple or compound lenses characterised by the shape

Definitions

  • the invention relates to the technical field of cameras, in particular to an optical imaging lens and imaging equipment.
  • An object of the present invention is to provide an optical imaging lens and an imaging device to solve the above problems.
  • the present invention provides an optical imaging lens, which includes, in order from the object side to the imaging plane along the optical axis: a first group, an aperture, and a second group, the first group has a negative power, the first The group includes a first lens and a second lens in order from the object side to the imaging plane, where the first lens has negative power, the object side and the image side of the first lens are both concave; the second lens has positive power Degree, both the object side and the image side of the second lens are convex.
  • the second group has positive power
  • the second group includes, in order from the object side to the imaging plane, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein the third lens has positive power , The object side of the third lens is convex and the image side is concave; the fourth lens has negative power, the object and image sides of the fourth lens are concave; the fifth lens has positive power, the object of the fifth lens Both the side and the image side are convex; the sixth lens has positive power, the object side of the sixth lens is convex and the image side is concave; the fourth lens and the fifth lens form a cemented body with positive power; the diaphragm setting Between the first group and the second group.
  • the present invention also provides an imaging device including the optical imaging lens provided in the first aspect.
  • the first group in the optical imaging lens and imaging device provided by the present invention can provide a larger angle of view
  • the second group can effectively shorten the total length of the lens system
  • the adhesive body formed by the lens can reduce the aberration of the lens.
  • the optical imaging lens and imaging device provided by the present invention can provide good imaging quality.
  • FIG. 1 is a schematic structural diagram of a cross section of an optical imaging lens provided by an embodiment of the present invention
  • FIG. 2 is a field curvature curve diagram of the optical imaging lens provided by the first embodiment of the present invention.
  • FIG. 3 is a graph of the spherical aberration on the axis of the optical imaging lens provided by the first embodiment of the present invention.
  • FIG. 4 is a lateral chromatic aberration curve diagram of the optical imaging lens provided by the first embodiment of the present invention.
  • FIG. 5 is a schematic diagram of field curvature of an optical imaging lens provided by a second embodiment of the present invention.
  • FIG. 6 is a graph of the spherical aberration on the axis of the optical imaging lens provided by the second embodiment of the present invention.
  • FIG. 7 is a lateral chromatic aberration curve diagram of an optical imaging lens provided by a second embodiment of the present invention.
  • FIG. 8 is a graph of a field curve of an optical imaging lens provided by a third embodiment of the invention.
  • FIG. 9 is a graph of the spherical aberration on the axis of the optical imaging lens provided by the third embodiment of the present invention.
  • FIG. 10 is a lateral chromatic aberration curve diagram of an optical imaging lens provided by a third embodiment of the present invention.
  • FIG. 11 is a field curve diagram of an optical imaging lens provided by a fourth embodiment of the present invention.
  • FIG. 13 is a lateral chromatic aberration curve diagram of an optical imaging lens provided by a fourth embodiment of the present invention.
  • Optical imaging lens 100 First group Q1 First lens L1 Second lens L2 Second group Q2 Third lens L3 Fourth lens L4 Fifth lens L5 Sixth lens L6 Diaphragm ST Filter G1 plate glass G2
  • the invention provides an optical imaging lens, which includes, in order from the object side to the imaging plane along the optical axis: a first group, a diaphragm, and a second group.
  • the first group has negative power
  • the first group includes, in order from the object side to the imaging plane, a first lens and a second lens, wherein the first lens has negative power, and the object side of the first lens and The image side is concave; the second lens has positive power, and the object side and image side of the second lens are both convex.
  • the second group has positive power
  • the second group includes, in order from the object side to the imaging plane, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein the third lens has positive power , The object side of the third lens is convex and the image side is concave; the fourth lens has negative power, the object and image sides of the fourth lens are concave; the fifth lens has positive power, the object of the fifth lens Both the side and the image side are convex; the sixth lens has positive power, the object side of the sixth lens is convex and the image side is concave; the fourth lens and the fifth lens form a cemented body, and the cemented body has positive power.
  • the diaphragm is disposed between the first group and the second group.
  • the optical imaging lens provided by the present invention satisfies the following conditional formula:
  • IH represents the half image height of the optical imaging lens
  • f represents the focal length of the entire optical imaging lens
  • ⁇ represents the half angle of view of the optical imaging lens. This condition reflects the ratio of actual image height to ideal image height.
  • the optical imaging lens provided by the present invention satisfies the following conditional formula:
  • the ratio of the combined power of the fourth lens and the fifth lens to the power of the optical imaging lens is within the above range, which can effectively correct the astigmatism of the lens and improve the resolution of the lens.
  • the optical imaging lens provided by the present invention satisfies the following conditional formula:
  • the sum of the power of the fourth lens and the fifth lens is within the above range, which can effectively correct the chromatic aberration of the lens and improve the lens resolution.
  • the optical imaging lens provided by the present invention satisfies the following conditional formula:
  • (dn / dt) 2 represents the refractive index temperature coefficient of the material of the second lens
  • (dn / dt) 5 represents the refractive index temperature coefficient of the material of the fifth lens.
  • the temperature coefficient of the refractive index of the second lens and the temperature coefficient of the refractive index of the fifth lens are within this range, which can effectively reduce the sensitivity of the lens to temperature, and can be within a large temperature range (for example, -40 ° C to + 105 ° C) Clear imaging, improve the stability of lens resolution at different temperatures.
  • the optical imaging lens provided by the present invention satisfies the following conditional formula:
  • Vd 2 represents the material Abbe number of the second lens
  • Vd 3 represents the material Abbe number of the third lens
  • Vd 4 represents the material Abbe number of the fourth lens.
  • the Abbe numbers of the second lens, the third lens, and the fourth lens satisfy the above conditions, which is beneficial to correct the chromatic aberration of the optical imaging lens.
  • the optical imaging lens provided by the present invention has an aperture number F # ⁇ 1.7, which can meet the imaging requirements of the optical imaging lens in a bright and dark environment.
  • the lenses in the optical imaging lens provided by the present invention are all glass spherical lenses.
  • the use of glass lenses can effectively delay the aging of the lens, the temperature control is good, it can adapt to different temperature occasions, and has a higher use Life and stability.
  • the use of spherical lenses can effectively reduce the production cost of optical imaging lenses.
  • the total optical length of the optical imaging lens provided by the present invention is less than 21 mm, which is beneficial to the miniaturization of the optical imaging lens.
  • an imaging device including the optical imaging lens provided in any one of the above embodiments.
  • the imaging device may be an in-vehicle device, a monitoring device, or any imaging device using the above optical imaging lens.
  • the first group in the optical imaging lens and imaging device provided by the present invention can provide a larger angle of view, and the second group can effectively shorten the total length of the lens system, in which the fourth lens and the fifth lens form an adhesive body The aberration of the lens can be reduced.
  • the optical imaging lens and imaging device provided by the present invention can provide good imaging quality.
  • the cross-sectional structure of the optical imaging lens is shown in FIG. 1.
  • the relevant parameters of each lens in the optical imaging lens are shown in Table 1 to Table 4, where r represents the radius of curvature of the apex of the optical curved surface, d represents the distance between the optical surfaces (the distance between the vertices of two adjacent optical curved surfaces), n d represents the refractive index of each lens, and Vd represents the Abbe number of each lens material.
  • the optical characteristics corresponding to each embodiment are shown in Table 5, where f represents the focal length of the optical imaging lens, F # represents the aperture number, 2 ⁇ represents the angle of view, and TL represents the total optical length of the optical imaging lens.
  • the lens structures of the embodiments are similar.
  • the difference is that the thickness, radius of curvature, and material selection of each lens in the optical imaging lens are different.
  • this embodiment provides an optical imaging lens 100, which includes, in order from the object side to the imaging plane S15 along the optical axis: a first group Q1, a stop ST, a second group Q2, and a filter G1.
  • the first group Q1 has negative power
  • the first group Q1 includes a first lens L1 and a second lens L2 in order from the object side to the imaging plane, wherein the first lens L1 has negative power, the first The object side surface S1 and the image side surface S2 of the lens L1 are both concave surfaces; the second lens L2 has positive refractive power, and the object side surface S3 and the image side surface S4 of the second lens L2 are both convex surfaces.
  • the second group Q2 has a positive refractive power
  • the second group Q2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 in order from the object side to the imaging plane.
  • the three lens L3 has positive power, the object side S5 of the third lens L3 is convex and the image side S6 is concave; the fourth lens L4 has negative power, and the object side S7 and image side S8 of the fourth lens L4 are both concave
  • the fifth lens L5 has positive power, and the object side S8 of the fifth lens L5 (bonded with the image side S8 of the fourth lens L4 and share a common code) and the image side S9 are both convex;
  • the sixth lens L6 has positive power
  • the object side surface S10 of the sixth lens L6 is convex and the image side surface S11 is concave; the fourth lens L4 and the fifth lens L5 form a cemented body having positive refractive power, specifically, the image side surface S8 and
  • the stop ST is provided between the first group Q1 and the second group Q2.
  • the filter G1 is disposed between the second group Q2 and the imaging plane S16.
  • the filter G1 includes an object side S12 and an image side S13.
  • the optical imaging lens 100 in this embodiment further includes a flat glass G2, which is disposed between the filter G1 and the imaging plane S16, and the flat glass G2 includes an object side S14 and an image side S15.
  • the field curvature, on-axis spherical aberration, and lateral chromatic aberration curves are shown in Figures 2, 3, and 4, respectively. It can be seen from FIGS. 2 to 4 that the field curvature and chromatic aberration can be corrected well in this embodiment.
  • the structural diagram of the optical imaging lens provided in the second embodiment of the present invention is substantially the same as that of the first embodiment, and the relevant parameters of each lens in the optical imaging lens are shown in Table 2.
  • the field curvature, on-axis spherical aberration and lateral chromatic aberration curves are shown in Figures 5, 6 and 7 respectively. It can be seen from FIGS. 5 to 7 that the field curvature and chromatic aberration can be corrected well in this embodiment.
  • the structural diagram of the optical imaging lens provided in the third embodiment of the present invention is substantially the same as that of the first embodiment, and the relevant parameters of each lens in the optical imaging lens are shown in Table 3.
  • the field curvature, on-axis spherical aberration, and lateral chromatic aberration curves are shown in Figures 8, 9, and 10, respectively. It can be seen from FIGS. 8 to 10 that the field curvature and chromatic aberration can be corrected well in this embodiment.
  • the structural diagram of the optical imaging lens provided in the fourth embodiment of the present invention is substantially the same as that of the first embodiment, and the relevant parameters of each lens in the optical imaging lens are shown in Table 4.
  • the field curvature, on-axis spherical aberration, and lateral chromatic aberration graphs are shown in FIG. 11, FIG. 12, and FIG. 13, respectively. It can be seen from FIGS. 11 to 13 that the field curvature and chromatic aberration can be corrected well in this embodiment.
  • the first to fourth embodiments and their corresponding optical characteristics are shown in Table 5, including the system focal length f, the aperture number F #, the angle of view 2 ⁇ , and the total optical length T L of the system, and the values corresponding to each of the foregoing conditional expressions.
  • the optical imaging lens 100 of the present invention adopts the design of six glass lenses. Through the selection of each lens material and the reasonable matching of optical power, it can clearly image in the temperature range of -40 °C ⁇ +105 °C, of which the first group Q1 is beneficial to provide With a larger field of view, the second group Q2 helps to effectively shorten the total length of the lens system and can provide good imaging quality.
  • the optical imaging lens 100 and the imaging device provided by the present invention can provide good imaging quality.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
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  • Lenses (AREA)

Abstract

一种光学成像镜头（100）及成像设备，光学成像镜头（100）沿光轴从物侧到成像面（S15）依次包括：第一群组（Q1）、光阑（ST）、第二群组（Q2），其中，第一群组（Q1）具有负光焦度，第一群组（Q1）从物侧到成像面（S15）依次包括具有负光焦度的双凹第一透镜（L1）和具有正光焦度的双凸第二透镜（L2）；第二群组（Q2）具有正光焦度，第二群组（Q2）从物侧到成像面（S15）依次包括具有正光焦度、物侧面（S5）为凸面且像侧面（S6）为凹面的第三透镜（L3），具有负光焦度的双凹第四透镜（L4），具有正光焦度的双凸第五透镜（L5），具有正光焦度、物侧面（S10）为凸面且像侧面（S11）为凹面的第六透镜（L6），其中，第四透镜（L4）和第五透镜（L5）形成具有正光焦度的粘合体；光阑（ST）设置于第一群组（Q1）和第二群组（Q2）之间。光学成像镜头（100）及成像设备能提供良好的成像品质。

Description

光学成像镜头及成像设备
本申请要求于2018年11月23日提交中国专利局、申请号为2018114128742、发明名称为“光学成像镜头及成像设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及摄像头技术领域，特别涉及一种光学成像镜头及成像设备。
背景技术
随着自动驾驶功能的发展，车载镜头作为自动驾驶辅助系统的关键部件也迎来了较快发展，对该镜头的要求也越来越高。自动驾驶辅助系统中的车载光学镜头与普通的光学镜头相比需要有较高的成像清晰度，以满足无人驾驶系统的高要求。然而，在高温或者低温的条件下，现有的车载光学成像镜头难以清晰成像。
发明内容
本发明的目的在于提供一种光学成像镜头及成像设备，以解决上述问题。
本发明实施例通过以下技术方案来实现上述目的。
第一方面，本发明提供一种光学成像镜头，沿光轴从物侧到成像面依次包括：第一群组、光阑、第二群组，第一群组具有负光焦度，第一群组从物侧到成像面依次包括一个第一透镜和一个第二透镜，其中，第一透镜具有负光焦度，第一透镜的物侧面和像侧面均为凹面；第二透镜具有正光焦度，第二透镜的物侧面和像侧面均为凸面。第二群组具有正光焦度，第二群组从物侧到成像面依次包括一个第三透镜、一个第四透镜、一个第五透镜和一个第六透镜，其中，第三透镜具有正光焦度，第三透镜的物侧面为凸面且像侧面为凹面；第四透镜具有负光焦度， 第四透镜的物侧面和像侧面均为凹面；第五透镜具有正光焦度，第五透镜的物侧面和像侧面均为凸面；第六透镜具有正光焦度，第六透镜的物侧面为凸面且像侧面为凹面；第四透镜和第五透镜形成具有正光焦度的粘合体；光阑设置于第一群组和第二群组之间。
第二方面，本发明还提供一种成像设备，该成像设备包括第一方面提供的光学成像镜头。
相较于现有技术，本发明提供的光学成像镜头及成像设备中的第一群组可提供较大的视场角，第二群组可有效缩短透镜系统总长度，第四透镜和第五透镜形成的粘合体可以减小镜头的像差。本发明提供的光学成像镜头及成像设备能提供良好的成像品质。
本发明的这些方面或其他方面在以下实施例的描述中会更加简明易懂。
附图说明
图1为本发明实施例提供的光学成像镜头的截面的结构示意图；
图2为本发明第一实施例提供的光学成像镜头的场曲曲线图；
图3为本发明第一实施例提供的光学成像镜头的轴上点球差曲线图；
图4为本发明第一实施例提供的光学成像镜头的横向色差曲线图；
图5为本发明第二实施例提供的光学成像镜头的场曲示意图；
图6为本发明第二实施例提供的光学成像镜头的轴上点球差曲线图；
图7为本发明第二实施例提供的光学成像镜头的横向色差曲线图；
图8为本发明第三实施例提供的光学成像镜头的场曲曲线图；
图9为本发明第三实施例提供的光学成像镜头的轴上点球差曲线图；
图10为本发明第三实施例提供的光学成像镜头的横向色差曲线图；
图11为本发明第四实施例提供的光学成像镜头的场曲曲线图；
图12为本发明第四实施例提供的光学成像镜头的轴上点球差曲线图；
图13为本发明第四实施例提供的光学成像镜头的横向色差曲线图。
主要元素符号说明
光学成像镜头 100 第一群组 Q1
第一透镜 L1 第二透镜 L2
第二群组 Q2 第三透镜 L3
第四透镜 L4 第五透镜 L5
第六透镜 L6 光阑 ST
滤光片 G1 平板玻璃 G2
如下具体实施方式将结合上述附图进一步说明本发明。
具体实施方式
为了便于更好地理解本发明，下面将结合相关实施例附图对本发明进行进一步地解释。附图中给出了本发明的实施例，但本发明并不仅限于上述的优选实施例。相反，提供这些实施例的目的是为了使本发明的公开面更加得充分。
本发明提供一种光学成像镜头，沿光轴从物侧到成像面依次包括：第一群组、光阑、第二群组。第一群组具有负光焦度，第一群组从物侧到成像面依次包括一个第一透镜和一个第二透镜，其中，第一透镜具有负光焦度，第一透镜的物侧面和像侧面均为凹面；第二透镜具有正光焦度，第二透镜的物侧面和像侧面均为凸面。第二群组具有正光焦度，第二群组从物侧到成像面依次包括一个第三透镜、一个第四透镜、一个第五透镜和一个第六透镜，其中，第三透镜具有正光焦度，第三透镜的物侧面为凸面且像侧面为凹面；第四透镜具有负光焦度，第四透镜的物侧面和像侧面均为凹面；第五透镜具有正光焦度，第五透镜的物侧面和像侧面均为凸面；第六透镜具有正光焦度，第六透镜的物侧面为凸面且像侧面为凹面；第四透镜和第五透镜形成粘合体，粘合体具有正光焦度。光阑设置于第一群组和第二群组之间。
在一种实施方式中，本发明提供的光学成像镜头满足以下条件式：
0.7＜IH/(f*tanθ)＜1；
其中，IH表示光学成像镜头的半像高，f表示整个光学成像镜头的焦距，θ表示光学成像镜头的半视场角。此条件反映了实际像高与理想像高的比值。
在一种实施方式中，本发明提供的光学成像镜头满足以下条件式：
Figure PCTCN2019106772-appb-000001
其中，
Figure PCTCN2019106772-appb-000002
表示第四透镜与第五透镜的组合光焦度，
Figure PCTCN2019106772-appb-000003
表示整个光学成像镜头的光焦度。第四透镜和第五透镜的组合光焦度与光学成像镜头光焦度的比值在上述范围内，可有效矫正镜头的像散，提升镜头解析力。
在一种实施方式中，本发明提供的光学成像镜头满足以下条件式：
Figure PCTCN2019106772-appb-000004
其中，
Figure PCTCN2019106772-appb-000005
表示第四透镜的光焦度，
Figure PCTCN2019106772-appb-000006
表示第五透镜的光焦度。第四透镜和第五透镜的光焦度之和在上述范围内，可以有效的矫正镜头的色差，提升镜头解析力。
在一种实施方式中，本发明提供的光学成像镜头满足以下条件式：
(dn/dt) 2＞2.5×10 -6/℃；
(dn/dt) 5≤-2×10 -6/℃；
其中，(dn/dt) 2表示第二透镜的材料的折射率温度系数，(dn/dt) 5表示第五透镜的材料的折射率温度系数。第二透镜的折射率温度系数与第五透镜的折射率温度系数在此范围内，可有效降低镜头对温度的敏感程度，能够在较大温度范围(例如为-40℃～+105℃)内清晰成像，提升镜头解析力在不同温度下的稳定性。
在一种实施方式中，本发明提供的光学成像镜头满足以下条件式：
Vd 2＜40；
Vd 3＜31；
Vd 4＜25；
其中，Vd 2表示第二透镜的材料阿贝数，Vd 3表示第三透镜的材料阿贝数，Vd 4表示第四透镜的材料阿贝数。第二透镜、第三透镜及第四透镜的材料阿贝数满足上述条件，有利于矫正光学成像镜头的色差。
在一种实施方式中，本发明提供的光学成像镜头的光圈数F#<1.7，能够满足该光学成像镜头在明暗环境中的成像需求。
在一种实施方式中，本发明提供的光学成像镜头中的透镜均为玻璃球面透 镜，采用玻璃透镜可以有效延缓镜头的老化，温度控制好，能适应不同的温度场合，且有较高的使用寿命和稳定性。采用球面透镜，可有效降低光学成像镜头的生产成本。
在一种实施方式中，本发明提供的光学成像镜头的光学总长小于21mm，利于光学成像镜头的小型化。
在一种实施方式中，还提供一种成像设备，包括上述任意一种实施方式提供的光学成像镜头。成像设备可以是一种车载设备、一种监控设备或者任意一种使用上述光学成像镜头的成像设备。
本发明提供的光学成像镜头及成像设备中的第一群组可提供较大的视场角，第二群组可有效缩短透镜系统总长度，其中第四透镜和第五透镜形成的粘合体可以减小镜头的像差。本发明提供的光学成像镜头及成像设备能提供良好的成像品质。
在本发明的所有实施例中，光学成像镜头的截面结构均如图1所示。光学成像镜头中各个镜片的相关参数如表1-表4所示，其中，r表示光学曲面顶点的曲率半径，d表示光学表面间距(相邻的两个光学曲面顶点之间的距离)，n d表示各个透镜的折射率，Vd表示各个透镜的材料阿贝数。各实施例对应的光学特性如表5所示，其中，f表示光学成像镜头的焦距，F#表示光圈数，2θ表示视场角，T L表示光学成像镜头的光学总长。
在以下实施例中，各实施例的镜头结构大抵相似，不同之处在于：光学成像镜头中的各个透镜的厚度、曲率半径、材料选择部分有所不同，具体不同可参见各实施例的参数表。
第一实施例
请参阅图1，本实施例提供一种光学成像镜头100，沿光轴从物侧到成像面S15依次包括：第一群组Q1、光阑ST、第二群组Q2及滤光片G1。
第一群组Q1具有负光焦度，第一群组Q1从物侧到成像面依次包括一个第一透镜L1和一个第二透镜L2，其中，第一透镜L1具有负光焦度，第一透镜L1 的物侧面S1和像侧面S2均为凹面；第二透镜L2具有正光焦度，第二透镜L2的物侧面S3和像侧面S4均为凸面。
第二群组Q2具有正光焦度，第二群组Q2从物侧到成像面依次包括一个第三透镜L3、一个第四透镜L4、一个第五透镜L5和一个第六透镜L6，其中，第三透镜L3具有正光焦度，第三透镜L3的物侧面S5为凸面且像侧面S6为凹面；第四透镜L4具有负光焦度，第四透镜L4的物侧面S7和像侧面S8均为凹面；第五透镜L5具有正光焦度，第五透镜L5的物侧面S8(和第四透镜L4的像侧面S8贴合并共用一个代号)和像侧面S9均为凸面；第六透镜L6具有正光焦度，第六透镜L6的物侧面S10为凸面且像侧面S11为凹面；第四透镜L4和第五透镜L5形成具有正光焦度的粘合体，具体地，第四透镜L4的像侧面S8和第五透镜L5的物侧面S8粘合在一起。
光阑ST设置于第一群组Q1和第二群组Q2之间。
滤光片G1设置于第二群组Q2和成像面S16之间，滤光片G1包括物侧面S12和像侧面S13。
本实施例中的光学成像镜头100还包括平板玻璃G2，平板玻璃G2设置于滤光片G1和成像面S16之间，平板玻璃G2包括物侧面S14和像侧面S15。
本实施例提供的光学成像镜头中各个镜片的相关参数如表1所示。
表1
Figure PCTCN2019106772-appb-000007
Figure PCTCN2019106772-appb-000008
在本实施例中，其场曲、轴上点球差和横向色差曲线图分别如图2、图3和图4所示。由图2至图4可以看出，本实施例中场曲、色差都能被很好的校正。
第二实施例
本发明第二实施例中提供的光学成像镜头的结构图与第一实施例大抵相同，光学成像镜头中各个镜片的相关参数如表2所示。
表2
Figure PCTCN2019106772-appb-000009
Figure PCTCN2019106772-appb-000010
在本实施例中，其场曲、轴上点球差和横向色差曲线图分别如图5、图6和图7所示。由图5至图7可以看出，本实施例中场曲、色差都能被很好的校正。
第三实施例
本发明第三实施例中提供的光学成像镜头的结构图与第一实施例大抵相同，光学成像镜头中各个镜片的相关参数如表3所示。
表3
Figure PCTCN2019106772-appb-000011
Figure PCTCN2019106772-appb-000012
在本实施例中，其场曲、轴上点球差和横向色差曲线图分别如图8、图9和图10所示。由图8至图10可以看出，本实施例中场曲、色差都能被很好的校正。
第四实施例
本发明第四实施例中提供的光学成像镜头的结构图与第一实施例大抵相同，光学成像镜头中各个镜片的相关参数如表4所示。
表4
Figure PCTCN2019106772-appb-000013
Figure PCTCN2019106772-appb-000014
在本实施例中，其场曲、轴上点球差和横向色差曲线图分别如图11、图12和图13所示。由图11至图13可以看出，本实施例中场曲、色差都能被很好的校正。
第一至第四实施例及其对应的光学特性如表5所示，包括系统焦距f、光圈数F#、视场角2θ和系统光学总长T L，以及与前面每个条件式对应的数值。
表5
Figure PCTCN2019106772-appb-000015
本发明光学成像镜头100采用六片玻璃镜片设计，通过各镜片材料的选择以及光焦度的合理搭配，能够在-40℃～+105℃温度范围内清晰成像，其中第一群组Q1利于提供较大的视场角，第二群组Q2利于有效缩短透镜系统总长度，能够提供良好的成像品质。
综上，本发明提供的光学成像镜头100及成像设备能提供良好的成像品质。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种光学成像镜头，其特征在于，沿光轴从物侧到成像面依次包括：
    具有负光焦度的第一群组，所述第一群组从物侧到成像面依次包括一个第一透镜和一个第二透镜，其中所述第一透镜具有负光焦度，所述第一透镜的物侧面和像侧面均为凹面，所述第二透镜具有正光焦度，所述第二透镜的物侧面和像侧面均为凸面；
    光阑；
    具有正光焦度的第二群组，所述第二群组从物侧到成像面依次包括一个第三透镜、一个第四透镜、一个第五透镜和一个第六透镜，其中所述第三透镜具有正光焦度，所述第三透镜的物侧面为凸面且像侧面为凹面，所述第四透镜具有负光焦度，所述第四透镜的物侧面和像侧面均为凹面，所述第五透镜具有正光焦度，所述第五透镜的物侧面和像侧面均为凸面，所述第六透镜具有正光焦度，所述第六透镜的物侧面为凸面且像侧面为凹面，所述第四透镜和所述第五透镜形成粘合体，所述粘合体具有正光焦度。
  2. 如权利要求1所述的光学成像镜头，其特征在于，所述光学成像镜头满足以下条件式：
    0.7＜IH/(f*tanθ)＜1；
    其中，IH表示所述光学成像镜头的半像高，f表示整个所述光学成像镜头的焦距，θ表示所述光学成像镜头的半视场角。
  3. 如权利要求1所述的光学成像镜头，其特征在于，所述光学成像镜头满足以下条件式：
    Figure WO-DOC-FIGURE-31
    ；其中，
    Figure WO-DOC-FIGURE-32
    表示所述第四透镜与所述第五透镜的组合光焦度，
    Figure WO-DOC-FIGURE-33
    表示整个所述光学成像镜头的光焦度。
  4. 如权利要求1所述的光学成像镜头，其特征在于，所述光学成像镜头满足以下条件式：
    Figure WO-DOC-FIGURE-41
    ；其中，
    Figure WO-DOC-FIGURE-42
    表示所述第四透镜的光焦度，
    Figure WO-DOC-FIGURE-43
    表示所述第五透镜的光焦度。
  5. 如权利要求1所述的光学成像镜头，其特征在于，所述光学成像镜头满足以下条件式：
    (dn/dt)2＞2.5×10-6/℃；
    (dn/dt)5≤-2×10-6/℃；
    其中，(dn/dt)2表示所述第二透镜的材料的折射率温度系数，(dn/dt)5表示所述第五透镜的材料的折射率温度系数。
  6. 如权利要求1所述的光学成像镜头，其特征在于，所述光学成像镜头满足以下条件式：
    Vd2＜40；
    Vd3＜31；
    Vd4＜25；
    其中，Vd2表示所述第二透镜的材料阿贝数，Vd3表示所述第三透镜的材料阿贝数，Vd4表示所述第四透镜的材料阿贝数。
  7. 如权利要求1所述的光学成像镜头，其特征在于，所述光学成像镜头的光圈数F#<1.7。
  8. 如权利要求1-7任一项所述的光学成像镜头，其特征在于，所述光学成像镜头中的透镜均为玻璃球面透镜。
  9. 如权利要求1所述的光学成像镜头，其特征在于，所述光学成像镜头的光学总长小于21mm。
  10. 一种成像设备，其特征在于，包括如权利要求1-9任一项所述的光学成像镜头。
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