WO2019228127A1 - 广角镜头 - Google Patents

广角镜头 Download PDF

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Publication number
WO2019228127A1
WO2019228127A1 PCT/CN2019/085183 CN2019085183W WO2019228127A1 WO 2019228127 A1 WO2019228127 A1 WO 2019228127A1 CN 2019085183 W CN2019085183 W CN 2019085183W WO 2019228127 A1 WO2019228127 A1 WO 2019228127A1
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WO
WIPO (PCT)
Prior art keywords
lens
wide
angle
angle lens
power
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PCT/CN2019/085183
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English (en)
French (fr)
Inventor
鲍宇旻
陈伟建
刘绪明
曾吉勇
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江西联创电子有限公司
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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
Publication of WO2019228127A1 publication Critical patent/WO2019228127A1/zh
Priority to US16/986,211 priority Critical patent/US11841549B2/en

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    • 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 -
    • G02B9/04—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only
    • G02B9/10—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only one + and one - component
    • 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
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • 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
    • 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 present invention relates to the technical field of cameras, and in particular, to a wide-angle lens.
  • the on-vehicle lens in the automatic driving assistance system has special requirements.
  • the on-board camera lens requires the front port diameter to be as small as possible, the light transmission ability is strong, and it can adapt to changes in the external environment.
  • the sharpness of the image can effectively distinguish the details of the external environment (such as highway identification information, distant pedestrians and vehicles, etc.), and good thermal stability, so that the lens has a good resolution at high and low temperatures to meet autonomous driving Special requirements.
  • an object of the present invention is to provide a wide-angle lens that maintains high resolution in a high and low temperature environment.
  • the invention provides a wide-angle lens, which includes a first lens group having a negative power, a second lens group having a positive power, and the first lens group and the second lens.
  • An aperture between groups wherein the first lens group includes a first lens having a negative power and a concave surface facing the imaging surface, a second lens having a negative power, and a positive light
  • the second lens group includes a biconvex fourth lens having a positive power and a fifth lens having a positive power, and a double lens having a negative power in order from the object side to the imaging surface.
  • the wide-angle lens provided by the present invention comprises a fifth lens and a sixth lens from the object side to the imaging surface along the optical axis to form a cemented lens; a combination structure of five glass spherical lenses and two glass aspherical surfaces is adopted. And through reasonable power matching, the combined wide-angle lens can clearly image in the temperature range of -40 ° C to + 85 ° C, while meeting the wide-angle characteristics and maintaining high resolution in high and low temperature environments.
  • the wide-angle lens satisfies a conditional expression: among them, Represents the power of the second lens, Represents the power of the seventh lens.
  • This condition indicates that the spherical aberration formed by the second lens and the seventh lens can cancel each other, which can effectively improve the resolution of the wide-angle lens.
  • the wide-angle lens satisfies a conditional expression: -5.5 ⁇ (dN / dT) 5 + (dN / dT) 6 ⁇ -4.5, where (dN / dT) 5 represents a refractive index temperature coefficient of the fifth lens, (dN / dT) 6 represents a refractive index temperature coefficient of the sixth lens.
  • This condition indicates that the fifth lens and the sixth lens can effectively compensate for the influence of temperature changes on the focal length of the wide-angle lens, and further improve the stability of the resolution of the wide-angle lens at different temperatures.
  • the wide-angle lens satisfies a conditional expression: -15.5 ⁇ (dN / dT) 2 + (dN / dT) 7 ⁇ -8.0, where (dN / dT) 2 represents a refractive index temperature coefficient of the second lens, (dN / dT) 7 represents a refractive index temperature coefficient of the seventh lens. Satisfying this condition can effectively reduce the sensitivity of the wide-angle lens to temperature and improve the stability of the resolution of the wide-angle lens at different temperatures.
  • the wide-angle lens satisfies a conditional expression: among them, Represents the power of the fifth lens, Represents the power of the sixth lens. Satisfying this condition can effectively correct the chromatic aberration of the wide-angle lens and improve the resolution of the wide-angle lens.
  • the wide-angle lens satisfies a conditional expression: among them, Represents the combined power of the second lens group, Represents the power of the wide-angle lens. Satisfying this condition can effectively correct the astigmatism of the wide-angle lens and improve the resolution of the wide-angle lens.
  • the wide-angle lens satisfies a conditional expression: 0.95 ⁇
  • This condition reflects the ratio of the actual image height to the ideal image height of the wide-angle lens.
  • z represents the distance from the vertex of the surface in the optical axis direction
  • c represents the curvature of the vertex of the surface
  • K represents the quadric surface coefficient
  • h represents the distance from the optical axis to the surface
  • B, C, D, E, and F represent four Order, sixth order, eighth order, tenth order, twelfth order surface coefficients.
  • the wide-angle lens of the present invention has at least the following advantages:
  • the wide-angle lens uses seven glass lenses, which can clearly image in the temperature range of -40 ° C to + 85 ° C, and is particularly suitable for imaging fields such as sports cameras and car cameras with harsh environments;
  • the wide-angle lens has clear imaging through reasonable configuration of the power combination between the lenses, and can match imaging chips with more than 8 million pixels;
  • the field of view angle of this wide-angle lens can reach 146 °, which can effectively correct f- ⁇ distortion and control f- ⁇ distortion less than 5%, which can meet the needs of large field of view angles;
  • the wide-angle lens has an aperture number of 1.8, which can meet the imaging needs of dark environments.
  • FIG. 1 is a schematic cross-sectional structure diagram of a wide-angle lens in a first embodiment of the present invention
  • FIG. 2 is a field curve diagram of a wide-angle lens in the first embodiment of the present invention
  • FIG. 3 is a graph of axial aberration of the wide-angle lens in the first embodiment of the present invention.
  • FIG. 5 is a schematic cross-sectional structure diagram of a wide-angle lens in a second embodiment of the present invention.
  • FIG. 6 is a field curve curve diagram of a wide-angle lens in a second embodiment of the present invention.
  • FIG. 7 is a graph of axial aberration of a wide-angle lens in a second embodiment of the present invention.
  • FIG. 8 is a vertical axis chromatic aberration curve diagram of a wide-angle lens in a second embodiment of the present invention.
  • FIG. 9 is a schematic cross-sectional structure diagram of a wide-angle lens in a third embodiment of the present invention.
  • FIG. 10 is a field curve diagram of a wide-angle lens in a third embodiment of the present invention.
  • FIG. 11 is a graph of axial aberration of a wide-angle lens in a third embodiment of the present invention.
  • FIG. 12 is a vertical axis chromatic aberration curve diagram of a wide-angle lens in a third embodiment of the present invention.
  • FIG. 13 is a schematic cross-sectional structure diagram of a wide-angle lens in a fourth embodiment of the present invention.
  • FIG. 14 is a field curve diagram of a wide-angle lens in a fourth embodiment of the present invention.
  • 15 is a graph of axial aberration of a wide-angle lens in a fourth embodiment of the present invention.
  • FIG. 16 is a vertical chromatic aberration curve diagram of a wide-angle lens in a fourth embodiment of the present invention.
  • FIG. 1 is a structural diagram of a wide-angle lens 100 according to a first embodiment of the present invention.
  • the first lens group includes, from the object side to the imaging surface, a meniscus-type first lens L1 having a negative optical power and a concave surface facing the imaging surface, a biconcave second lens L2 having a negative optical power, and a positive optical focus.
  • Third biconvex lens L3; the second lens group includes a biconvex fourth lens L4 with a positive power, a fifth biconvex lens L5 with a positive power, and a negative power from the object side to the imaging surface in order.
  • the wide-angle lens provided by the present invention comprises a fifth lens L5 and a sixth lens L6 from the object side to the imaging plane along the optical axis to form a cemented lens; the first lens L1, the third lens L3, the fourth lens L4, and the fifth lens L5 and sixth lens L6 are made of glass spherical lenses. At the same time, the second lens L2 and seventh lens L7 are made of glass aspheric lenses. After the combination of each lens, the power of each lens is set reasonably to make the combination.
  • the rear wide-angle lens 100 can clearly image in a temperature range of -40 ° C to + 85 ° C, while satisfying wide-angle characteristics and maintaining high resolution in high and low temperature environments.
  • the surface shapes of the second lens L2 and the seventh lens L7 both satisfy the following equations:
  • z represents the distance of the surface from the surface vertex in the direction of the optical axis
  • c represents the curvature of the surface vertex
  • K represents the quadric surface coefficient
  • h represents the distance from the optical axis to the surface
  • B, C, D, E, and F represent four Order, sixth order, eighth order, tenth order, twelfth order surface coefficients.
  • FIG. 1 is a wide-angle lens 100 provided in a first embodiment of the present invention, and related parameters of each lens in the wide-angle lens 100 are shown in Tables 1-1 to 1-2.
  • the curves of the field curvature, axial aberration, and vertical axis chromatic aberration are shown in Figs. 2, 3, and 4, respectively. It can be seen that the field curvature range is between (-0.05, +0.05). The axial aberration is between (-0.02, +0.02) and the vertical chromatic aberration is between (-2.0, +10.0), which indicates that the field curvature, aberration, and chromatic aberration in this embodiment can be well corrected.
  • FIG. 5 is a structural diagram of a wide-angle lens 100 provided in a second embodiment of the present invention.
  • This embodiment is substantially the same as the lens structure of Embodiment 1 except that: (1) the object side of the second lens L2 is convex The image side is concave, and the object side of the third lens L3 is convex. The image side is concave; (2) The related parameters of the lenses in the wide-angle lens of this embodiment are different, as shown in Table 2-1. The lenses of this embodiment are not The spherical parameters are shown in Table 2-2.
  • the curves of the field curvature, axial aberration, and vertical axis chromatic aberration are shown in Figs. 6, 7, and 8, respectively. It can be seen that the field curvature ranges between (-0.05, +0.05).
  • the axial aberration is between (-0.02, +0.02) and the vertical chromatic aberration is between (-2.0, +10.0), which indicates that the field curvature, aberration, and chromatic aberration in this embodiment can be well corrected.
  • FIG. 9 is a structural diagram of a wide-angle lens 100 provided in a third embodiment of the present invention.
  • the lens structure of this embodiment is substantially the same as that of Embodiment 2.
  • the difference is that the relevant parameters of each lens in the wide-angle lens 100 of this embodiment are different.
  • Table 3-1 the parameters of the aspheric surface of each lens in this embodiment are shown in Table 3-2.
  • the curves of the field curvature, axial aberration, and vertical axis chromatic aberration are shown in Figs. 10, 11, and 12, respectively. It can be seen that the field curvature ranges between (-0.1, +0.1).
  • the axial aberration is between (-0.02, +0.02) and the vertical chromatic aberration is between (-2.0, +10.0), which indicates that the field curvature, aberration, and chromatic aberration in this embodiment can be well corrected.
  • FIG. 13 is a structural diagram of a wide-angle lens 100 provided in a fourth embodiment of the present invention.
  • the lens structure of this embodiment is substantially the same as that of Embodiment 2.
  • the difference is that the relevant parameters of each lens in the wide-angle lens 100 of this embodiment are different.
  • Table 4-1 the parameters of the aspheric surface of each lens in this embodiment are shown in Table 4-2.
  • the curves of the field curvature, axial aberration, and vertical axis chromatic aberration are shown in Figs. 14, 15, and 16, respectively. It can be seen that the field curvature ranges between (-0.05, +0.05).
  • the axial aberration is between (-0.02, +0.02) and the vertical chromatic aberration is between (-2.0, +10.0), which indicates that the field curvature, aberration, and chromatic aberration in this embodiment can be well corrected.
  • Table 5 is obtained by combining the above four embodiments.
  • Table 5 is the above four embodiments and their corresponding optical characteristics, including the system focal length f, the aperture number F #, the field angle 2 ⁇ , and the total system length T L. The value corresponding to the conditional expression.
  • the wide-angle lens 100 satisfies the conditional expression: among them, Represents the power of the second lens L2, Represents the power of the seventh lens L7.
  • This condition indicates that the spherical aberration formed by the second lens L2 and the seventh lens L7 can cancel each other, which can effectively improve the resolution of the wide-angle lens 100.
  • the wide-angle lens 100 satisfies a conditional expression: -5.5 ⁇ (dN / dT) 5 + (dN / dT) 6 ⁇ -4.5, where (dN / dT) 5 represents a refractive index temperature coefficient of the fifth lens L5, (dN / dT) 6 represents the refractive index temperature coefficient of the sixth lens L6.
  • This condition indicates that the fifth lens L5 and the sixth lens L6 can effectively compensate for the influence of temperature change on the focal length of the wide-angle lens 100, and further improve the stability of the resolution of the wide-angle lens 100 at different temperatures.
  • the wide-angle lens 100 satisfies a conditional expression: -15.5 ⁇ (dN / dT) 2 + (dN / dT) 7 ⁇ -8.0, where (dN / dT) 2 represents a refractive index temperature coefficient of the second lens L2, (dN / dT) 7 represents the refractive index temperature coefficient of the seventh lens L7. Satisfying this condition can effectively reduce the sensitivity of the wide-angle lens 100 to temperature and improve the stability of the resolution of the wide-angle lens 100 at different temperatures.
  • the wide-angle lens 100 satisfies a conditional expression: among them, Represents the power of the fifth lens L5, Represents the power of the sixth lens L6. Satisfying this condition can effectively correct the chromatic aberration of the wide-angle lens 100 and improve the resolution of the wide-angle lens 100.
  • the wide-angle lens 100 satisfies a conditional expression: among them, Represents the combined power of the second lens group, Represents the power of the wide-angle lens 100. Meeting this condition can effectively correct the astigmatism of the wide-angle lens 100 and improve the resolution of the wide-angle lens 100.
  • the wide-angle lens 100 satisfies a conditional expression: 0.95 ⁇
  • This condition reflects a ratio of an actual image height to an ideal image height of the wide-angle lens 100.
  • the wide-angle lens 100 of the present invention also has at least the following advantages:
  • the wide-angle lens 100 uses seven glass lenses, which can clearly image in the temperature range of -40 ° C to + 85 ° C, and is particularly suitable for imaging fields such as sports cameras and car cameras with harsh environments;
  • the wide-angle lens 100 has clear imaging by reasonably configuring the power combination between the lenses, and can match an imaging chip with more than 8 million pixels;
  • the field of view angle of the wide-angle lens 100 can reach 146 °, which can effectively correct f- ⁇ distortion and control f- ⁇ distortion less than 5%, which can meet the needs of a large field of view angle;
  • the aperture number of the wide-angle lens 100 is 1.8, which can meet the imaging requirements of a dark environment.

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Abstract

一种广角镜头，包括第一透镜组、光阑和第二透镜组，其中，第一透镜组从物侧到成像面依次包括具有负光焦度且凹面朝向成像面的第一透镜、具有负光焦度且凹面朝向成像面的第二透镜和具有正光焦度的第三透镜；第二透镜组从物侧到成像面依次包括具有正光焦度的双凸第四透镜和双凸第五透镜、具有负光焦度的双凹第六透镜和具有正光焦度的双凸第七透镜；第一透镜、第三透镜、第四透镜、第五透镜和第六透镜均为玻璃球面镜片，第二透镜和第七透镜均为玻璃非球面镜片。广角镜头通过独特的玻璃球面与非球面的组合结构以及合理的光焦度搭配，能够实现镜头在-40℃～+85℃温度范围内清晰成像，同时能满足广角特性以及高成像品质的摄像需求。

Description

广角镜头 技术领域
本发明涉及摄像头技术领域，特别涉及一种广角镜头。
背景技术
随着自动驾驶功能的发展，车载镜头等广角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镜头与普通的光学镜头相比有着特殊的要求，如车载摄像镜头要求前端口径要尽量小，通光能力强，能适应外界环境的明暗变化，同时要求有较高的成像清晰度，能有效分辨外界环境的细节(如公路标识信息，远处的行人与车辆等)，以及很好的热稳定性，使镜头在高低温时都拥有良好的解像力，以满足自动驾驶的特殊要求。
然而，现有的车载镜头大都对温度比较敏感，难以适用于高温或低温的场合，在高温或低温的场合下镜头的分辨率低，难以消除色差，导致成像模糊，不利于实际应用。
发明内容
基于此，本发明的目的在于提供一种在高低温的环境中保持高分辨率的广角镜头。
本发明提供了一种广角镜头，从物侧到成像面包括具有负光焦度的第一透镜组、具有正光焦度的第二透镜组、设于所述第一透镜组以及所述第二透镜组之间的光阑，其中，所述第一透镜组从物侧到成像面依次包括具有负光焦度且凹面朝向成像面的第一透镜、具有负光焦度的第二透镜以及具有正光焦度的第三透镜；所述第二透镜组从物侧到成像面依次包括具有正光焦度的双凸第四透镜和具有正光焦度的双凸第五透镜、具有负光焦度的双凹第六透镜和具有正光焦度的双凸第七透镜；所述第五透镜和所述第六透镜组成胶合镜片；所述第一透镜、所述第三透镜、所述第四透镜、所述第五透镜以及所述第六透镜均为玻 璃球面镜片，所述第二透镜和所述第七透镜均为玻璃非球面镜片，且所述第一透镜组和所述第二透镜组中透镜的光学中心均位于同一直线上。
相较于现有技术，本发明提供的广角镜头，将沿光轴从物侧到成像面的第五透镜和第六透镜组成胶合镜片；采用五片玻璃球面镜片和两片玻璃非球面的组合结构及通过合理的光焦度搭配，使组合后的广角镜头能够在-40℃～+85℃温度范围内清晰成像，同时能满足广角特性以及在高低温的环境中保持高分辨率。
进一步地，所述广角镜头满足条件式：
Figure PCTCN2019085183-appb-000001
其中，
Figure PCTCN2019085183-appb-000002
表示所述第二透镜的光焦度，
Figure PCTCN2019085183-appb-000003
表示所述第七透镜的光焦度。此条件表明第二透镜和第七透镜形成的球差可以相互抵消，可有效提升广角镜头的解析力。
进一步地，所述广角镜头满足条件式：-5.5＜(dN/dT) 5+(dN/dT) 6＜-4.5，其中，(dN/dT) 5表示所述第五透镜的折射率温度系数，(dN/dT) 6表示所述第六透镜的折射率温度系数。此条件表明第五透镜和第六透镜能够有效补偿温度变化对广角镜头焦距的影响，进一步提升广角镜头解析力在不同温度下的稳定性。
进一步地，所述广角镜头满足条件式：-15.5＜(dN/dT) 2+(dN/dT) 7＜-8.0，其中，(dN/dT) 2表示所述第二透镜的折射率温度系数，(dN/dT) 7表示所述第七透镜的折射率温度系数。满足此条件，可有效降低广角镜头对温度的敏感程度，提升广角镜头的解析力在不同温度下的稳定性。
进一步地，所述广角镜头满足条件式：
Figure PCTCN2019085183-appb-000004
其中，
Figure PCTCN2019085183-appb-000005
表示所述第五透镜的光焦度，
Figure PCTCN2019085183-appb-000006
表示所述第六透镜的光焦度。满足此条件，可以有效的矫正广角镜头的色差，提升广角镜头的解析力。
进一步地，所述广角镜头满足条件式：
Figure PCTCN2019085183-appb-000007
其中，
Figure PCTCN2019085183-appb-000008
表示所述第二透镜组的组合光焦度，
Figure PCTCN2019085183-appb-000009
表示所述广角镜头的光焦度。满足此条件，可有效矫正广角镜头的像散，提升广角镜头的解析力。
进一步地，所述广角镜头满足条件式：0.95＜|IH/(f*θ)|＜1，其中，IH表示所述广角镜头的半像高，θ表示所述广角镜头的最大半视场角(用弧度表示)，f表示所述广角镜头的有效焦距。此条件反映了所述广角镜头的实际像高与理想像高的比值。
进一步地，所述第二透镜与第七透镜的表面形状均满足以下方程式：
Figure PCTCN2019085183-appb-000010
其中：z表示曲面离开曲面顶点在光轴方向的距离，c表示曲面顶点的曲率，K表示二次曲面系数，h表示光轴到曲面的距离，B、C、D、E，F分别表示四阶、六阶、八阶、十阶，十二阶曲面系数。
与现有技术相比，本发明广角镜头至少具有以下的优点：
(1)该广角镜头采用七片玻璃透镜，能够在-40℃～+85℃温度范围内清晰成像，特别适用于对环境比较苛刻的运动相机、车载相机等摄像领域；
(2)该广角镜头通过合理配置镜片间的光焦度组合，成像清晰，可匹配800万以上像素的成像芯片；
(3)该广角镜头的视场角可达146°，可有效修正f-θ畸变，控制f-θ畸变小于5％，能够满足大视场角度的需要；
(4)该广角镜头的光圈数为1.8，能够满足较暗环境的成像需要。
附图说明
图1为本发明第一实施例中广角镜头的截面结构示意图；
图2为本发明第一实施例中广角镜头的场曲曲线图；
图3为本发明第一实施例中广角镜头的轴向像差曲线图；
图4为本发明第一实施例中广角镜头的垂轴色差曲线图；
图5为本发明第二实施例中广角镜头的截面结构示意图；
图6为本发明第二实施例中广角镜头的场曲曲线图；
图7为本发明第二实施例中广角镜头的轴向像差曲线图；
图8为本发明第二实施例中广角镜头的垂轴色差曲线图；
图9为本发明第三实施例中广角镜头的截面结构示意图；
图10为本发明第三实施例中广角镜头的场曲曲线图；
图11为本发明第三实施例中广角镜头的轴向像差曲线图；
图12为本发明第三实施例中广角镜头的垂轴色差曲线图；
图13为本发明第四实施例中广角镜头的截面结构示意图；
图14为本发明第四实施例中广角镜头的场曲曲线图；
图15为本发明第四实施例中广角镜头的轴向像差曲线图；
图16为本发明第四实施例中广角镜头的垂轴色差曲线图。
主要元件符号说明：
广角镜头 100 光阑 ST
第一透镜 L1 第二透镜 L2
第三透镜 L3 第五透镜 L5
第四透镜 L4 第七透镜 L7
第六透镜 L6 滤光片 G1
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
为了便于理解本发明，下面将参照相关附图对本发明进行更全面的描述。附图中给出了本发明的若干个实施例。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本发明的公开内容更加透彻全面。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。本文所使用的术语“及/或”包括一个或多个相关的所列项目的任意的和所有的组合。
实施例1
请参阅图1，为本发明第一实施例提供的广角镜头100的结构图，从物侧到成像面包括具有负光焦度的第一透镜组、具有正光焦度的第二透镜组以及设于第一透镜组和第二透镜组之间的光阑ST。
具体的，第一透镜组从物侧到成像面依次包括具有负光焦度且凹面朝向成像面的弯月型第一透镜L1、具有负光焦度的双凹第二透镜L2以及具有正光焦度的双凸第三透镜L3；第二透镜组从物侧到成像面依次包括具有正光焦度的双凸第四透镜L4、具有正光焦度的双凸第五透镜L5、具有负光焦度的双凹第六透镜L6以及具有正光焦度的双凸第七透镜L7；第五透镜L5和第六透镜L6组成 胶合镜片；第一透镜L1、第三透镜L3、第四透镜L4、第五透镜L5以及第六透镜L6均为玻璃球面镜片，第二透镜L2和第七透镜L7均为玻璃非球面镜片，且第一透镜组和第二透镜组中透镜的光学中心均位于同一直线上。
本发明提供的广角镜头，将沿光轴从物侧到成像面的第五透镜L5和第六透镜L6组成胶合镜片；并将第一透镜L1、第三透镜L3、第四透镜L4、第五透镜L5和第六透镜L6采用玻璃球面镜片制备而成，同时将第二透镜L2和第七透镜L7采用玻璃非球面镜片，通过各个透镜的组合后，再合理设置各透镜的光焦度，使组合后的广角镜头100能够在-40℃～+85℃温度范围内清晰成像，同时能满足广角特性以及在高低温的环境中保持高分辨率。
具体的，在本实施例中，第二透镜L2和第七透镜L7的表面形状均满足以下方程式：
Figure PCTCN2019085183-appb-000011
其中：z表示曲面离开曲面顶点在光轴方向的距离，c表示曲面顶点的曲率，K表示二次曲面系数，h表示光轴到曲面的距离，B、C、D、E，F分别表示四阶、六阶、八阶、十阶，十二阶曲面系数。
在以下不同的实施例中，所述广角镜头100中各个镜片的相关参数参见各实施例的参数表。
请参阅图1，为本发明第一实施例中提供的广角镜头100，所述广角镜头100中各个镜片的相关参数如表1-1至1-2所示。
表1-1
Figure PCTCN2019085183-appb-000012
Figure PCTCN2019085183-appb-000013
表2-2
Figure PCTCN2019085183-appb-000014
在本实施例中，其场曲、轴向像差、垂轴色差的曲线图分别如图2、3、4所示，可以看出，场曲范围在(-0.05，+0.05)之间，轴向像差在(-0.02,+0.02)之间，垂轴色差在(-2.0,+10.0)之间，说明本实施例中场曲、像差、色差都能被很好的校正。
实施例2
请参阅图5，为本发明第二实施例中提供的广角镜头100结构图，本实施例与实施例1的镜头结构大抵相同，不同之处在于：(1)第二透镜L2的物侧面为凸面像侧面为凹面，第三透镜L3的物侧面为凸面像侧面为凹面；(2)本实施例 广角镜头中各个镜片的相关参数不同，具体如表2-1所示，本实施例的各透镜非球面的参数如表2-2所示。
表2-1
Figure PCTCN2019085183-appb-000015
表2-2
Figure PCTCN2019085183-appb-000016
Figure PCTCN2019085183-appb-000017
在本实施例中，其场曲、轴向像差、垂轴色差的曲线图分别如图6、7、8所示，可以看出，场曲范围在(-0.05,+0.05)之间，轴向像差在(-0.02,+0.02)之间，垂轴色差在(-2.0,+10.0)之间，说明本实施例中场曲、像差、色差都能被很好的校正。
实施例3
请参阅图9，为本发明第三实施例中提供的广角镜头100结构图，本实施例与实施例2的镜头结构大抵相同，不同之处在于，本实施例广角镜头100中各个镜片的相关参数不同，具体如表3-1所示，本实施例的各透镜非球面的参数如表3-2所示。
表3-1
Figure PCTCN2019085183-appb-000018
Figure PCTCN2019085183-appb-000019
表3-2
Figure PCTCN2019085183-appb-000020
在本实施例中，其场曲、轴向像差、垂轴色差的曲线图分别如图10、11、12所示，可以看出，场曲范围在(-0.1,+0.1)之间，轴向像差在(-0.02,+0.02)之间，垂轴色差在(-2.0,+10.0)之间，说明本实施例中场曲、像差、色差都能被很好的校正。
实施例4
请参阅图13，为本发明第四实施例中提供的广角镜头100结构图，本实施例与实施例2的镜头结构大抵相同，不同之处在于，本实施例广角镜头100中各个镜片的相关参数不同，具体如表4-1所示，本实施例的各透镜非球面的参数如表4-2所示。
表4-1
Figure PCTCN2019085183-appb-000021
Figure PCTCN2019085183-appb-000022
表4-2
Figure PCTCN2019085183-appb-000023
在本实施例中，其场曲、轴向像差、垂轴色差的曲线图分别如图14、15、16所示，可以看出，场曲范围在(-0.05,+0.05)之间，轴向像差在(-0.02,+0.02)之间，垂轴色差在(-2.0,+10.0)之间，说明本实施例中场曲、像差、色差都能被很好的校正。
综合上述四个实施例可得表5，表5是上述4个实施例及其对应的光学特性，包括系统焦距f、光圈数F#、视场角2ω和系统总长T L，以及与前面每个条件式对应的数值。
表5
Figure PCTCN2019085183-appb-000024
由表5可得，所述广角镜头100的光学总长小于28mm，光圈数F#为1.8，视场角2ω为145～148°。
由上可知，在具体实施过程中，该广角镜头100满足条件式：
Figure PCTCN2019085183-appb-000025
Figure PCTCN2019085183-appb-000026
其中，
Figure PCTCN2019085183-appb-000027
表示第二透镜L2的光焦度，
Figure PCTCN2019085183-appb-000028
表示第七透镜L7的光焦度。此条件表明第二透镜L2和第七透镜L7形成的球差可以相互抵消，可有效提升广角镜头100的解析力。
其中，该广角镜头100满足条件式：-5.5＜(dN/dT) 5+(dN/dT) 6＜-4.5，其中，(dN/dT) 5表示第五透镜L5的折射率温度系数，(dN/dT) 6表示第六透镜L6的折射率温度系数。此条件表明第五透镜L5和第六透镜L6能够有效补偿温度变化对广角镜头100焦距的影响，进一步提升广角镜头100解析力在不同温度下的稳定性。
其中，该广角镜头100满足条件式：-15.5＜(dN/dT) 2+(dN/dT) 7＜-8.0，其中，(dN/dT) 2表示第二透镜L2的折射率温度系数，(dN/dT) 7表示第七透镜L7的折射率温度系数。满足此条件，可有效降低广角镜头100对温度的敏感程度，提升广角镜头100的解析力在不同温度下的稳定性。
其中，该广角镜头100满足条件式：
Figure PCTCN2019085183-appb-000029
其中，
Figure PCTCN2019085183-appb-000030
表示第五透镜L5的光焦度，
Figure PCTCN2019085183-appb-000031
表示第六透镜L6的光焦度。满足此条件，可以有效的矫正广角镜头100的色差，提升广角镜头100的解析力。
其中，该广角镜头100满足条件式：
Figure PCTCN2019085183-appb-000032
其中，
Figure PCTCN2019085183-appb-000033
表示第 二透镜组的组合光焦度，
Figure PCTCN2019085183-appb-000034
表示广角镜头100的光焦度。满足此条件，可有效矫正广角镜头100的像散，提升广角镜头100的解析力。
其中，所述广角镜头100满足条件式：0.95＜|IH/(f*θ)|＜1，其中，IH表示广角镜头100的半像高，θ表示广角镜头100的最大半视场角(用弧度表示)，f表示广角镜头100的有效焦距。此条件反映了所述广角镜头100的实际像高与理想像高的比值。
通过上述结构参数的限定，本发明广角镜头100至少还具有以下的优点：
(1)该广角镜头100采用七片玻璃透镜，能够在-40℃～+85℃温度范围内清晰成像，特别适用于对环境比较苛刻的运动相机、车载相机等摄像领域；
(2)该广角镜头100通过合理配置镜片间的光焦度组合，成像清晰，可匹配800万以上像素的成像芯片；
(3)该广角镜头100的视场角可达146°，可有效修正f-θ畸变，控制f-θ畸变小于5％，能够满足大视场角度的需要；
(4)该广角镜头100的光圈数为1.8，能够满足较暗环境的成像需要。
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 (8)

  1. 一种广角镜头，从物侧到成像面包括具有负光焦度的第一透镜组、具有正光焦度的第二透镜组和设于所述第一透镜组和所述第二透镜组之间的光阑，其特征在于：
    所述第一透镜组从物侧到成像面依次包括具有负光焦度且凹面朝向成像面的弯月型第一透镜、具有负光焦度且凹面朝向成像面的第二透镜以及具有正光焦度的第三透镜；
    所述第二透镜组从物侧到成像面依次包括具有正光焦度的双凸第四透镜、具有正光焦度的双凸第五透镜、具有负光焦度的双凹第六透镜以及具有正光焦度的双凸第七透镜；
    所述第五透镜和所述第六透镜组成胶合镜片；
    所述第一透镜、所述第三透镜、所述第四透镜、所述第五透镜以及所述第六透镜均为玻璃球面镜片，所述第二透镜和所述第七透镜均为玻璃非球面镜片，且所述第一透镜组和所述第二透镜组中透镜的光学中心位均位于同一直线上。
  2. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    Figure PCTCN2019085183-appb-100001
    其中，
    Figure PCTCN2019085183-appb-100002
    表示所述第二透镜的光焦度，
    Figure PCTCN2019085183-appb-100003
    表示所述第七透镜的光焦度。
  3. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：-5.5＜(dN/dT) 5+(dN/dT) 6＜-4.5，其中，(dN/dT) 5表示所述第五透镜的折射率温度系数，(dN/dT) 6表示所述第六透镜的折射率温度系数。
  4. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：-15.5＜(dN/dT) 2+(dN/dT) 7＜-8.0，其中，(dN/dT) 2表示所述第二透镜的折射率温度系数，(dN/dT) 7表示所述第七透镜的折射率温度系数。
  5. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    Figure PCTCN2019085183-appb-100004
    其中，
    Figure PCTCN2019085183-appb-100005
    表示所述第五透镜的光焦度，
    Figure PCTCN2019085183-appb-100006
    表示所述第六透镜的光焦度。
  6. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：
    Figure PCTCN2019085183-appb-100007
    其中，
    Figure PCTCN2019085183-appb-100008
    表示所述第二透镜组的组合光焦度，
    Figure PCTCN2019085183-appb-100009
    表示所述广角镜头的光焦度。
  7. 根据权利要求1所述的广角镜头，其特征在于，所述广角镜头满足条件式：0.95＜|IH/(f*θ)|＜1，其中，IH表示所述广角镜头的半像高，θ表示所述广角镜头的最大半视场角，f表示所述广角镜头的有效焦距。
  8. 根据权利要求1所述的广角镜头的透镜成像系统，其特征在于，所述第二透镜和所述第七透镜的表面形状均满足方程式：
    Figure PCTCN2019085183-appb-100010
    其中，z表示曲面离开曲面顶点在光轴方向的距离，c表示曲面顶点的曲率，K表示二次曲面系数，h表示光轴到曲面的距离，B、C、D、E和F分别表示四阶、六阶、八阶、十阶和十二阶曲面系数。
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CN112485890B (zh) * 2020-11-26 2022-03-04 江西联创电子有限公司 光学成像镜头及成像设备
CN114114634B (zh) * 2021-12-10 2023-07-04 江西晶超光学有限公司 光学系统、摄像模组和汽车
CN116500761B (zh) * 2023-06-28 2023-11-10 协益电子（苏州）有限公司 一种环视镜头及具有其的摄像装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1982937A (zh) * 2005-12-15 2007-06-20 三星Techwin株式会社 小型变焦透镜
CN101071193A (zh) * 2006-05-10 2007-11-14 宾得株式会社 放大镜系统
JP2009204699A (ja) * 2008-02-26 2009-09-10 Tamron Co Ltd ズームレンズ
CN102298195A (zh) * 2010-06-24 2011-12-28 株式会社理光 成像镜头、和利用该成像镜头的成像设备和信息装置
CN103439785A (zh) * 2013-09-07 2013-12-11 江西联创电子有限公司 高像素广角镜头的透镜成像系统
CN104737052A (zh) * 2012-08-08 2015-06-24 株式会社尼康 变焦镜头、光学设备和变焦镜头的生产方法
CN106125258A (zh) * 2016-09-07 2016-11-16 江西联益光学有限公司 广角镜头
CN108469667A (zh) * 2018-05-31 2018-08-31 江西联创电子有限公司 广角镜头
CN208488589U (zh) * 2018-05-31 2019-02-12 江西联创电子有限公司 广角镜头

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10301028A (ja) * 1997-04-30 1998-11-13 Fuji Photo Optical Co Ltd 小型２群ズームレンズ
CN101373261B (zh) * 2007-08-22 2010-09-29 鸿富锦精密工业（深圳）有限公司 广角镜头及使用该广角镜头的车辆装置
CN103777332A (zh) * 2013-10-21 2014-05-07 福州开发区鸿发光电子技术有限公司 一种低成本双波段光学变焦镜头
JP6331124B2 (ja) * 2014-03-11 2018-05-30 株式会社リコー ズームレンズ、撮像装置および監視用ビデオカメラ
CN104880808B (zh) * 2015-06-12 2017-12-22 中山联合光电科技股份有限公司 一种小透视畸变、超广角光学系统
CN105487211B (zh) * 2016-01-07 2017-09-19 东莞市宇瞳光学科技股份有限公司 一种大光圈大像面的超广角变焦镜头

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1982937A (zh) * 2005-12-15 2007-06-20 三星Techwin株式会社 小型变焦透镜
CN101071193A (zh) * 2006-05-10 2007-11-14 宾得株式会社 放大镜系统
JP2009204699A (ja) * 2008-02-26 2009-09-10 Tamron Co Ltd ズームレンズ
CN102298195A (zh) * 2010-06-24 2011-12-28 株式会社理光 成像镜头、和利用该成像镜头的成像设备和信息装置
CN104737052A (zh) * 2012-08-08 2015-06-24 株式会社尼康 变焦镜头、光学设备和变焦镜头的生产方法
CN103439785A (zh) * 2013-09-07 2013-12-11 江西联创电子有限公司 高像素广角镜头的透镜成像系统
CN106125258A (zh) * 2016-09-07 2016-11-16 江西联益光学有限公司 广角镜头
CN108469667A (zh) * 2018-05-31 2018-08-31 江西联创电子有限公司 广角镜头
CN208488589U (zh) * 2018-05-31 2019-02-12 江西联创电子有限公司 广角镜头

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111856727A (zh) * 2020-08-20 2020-10-30 江西特莱斯光学有限公司 一种大孔径超广角高清镜头及包含该镜头的摄像设备
CN113741012A (zh) * 2021-11-08 2021-12-03 沂普光电(天津)有限公司 一种光学透镜模组
CN114002825A (zh) * 2021-12-24 2022-02-01 江西联创电子有限公司 鱼眼镜头
CN114002825B (zh) * 2021-12-24 2022-05-31 江西联创电子有限公司 鱼眼镜头

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