WO2020103598A1 - 一种镜头模组 - Google Patents

一种镜头模组

Info

Publication number
WO2020103598A1
WO2020103598A1 PCT/CN2019/110476 CN2019110476W WO2020103598A1 WO 2020103598 A1 WO2020103598 A1 WO 2020103598A1 CN 2019110476 W CN2019110476 W CN 2019110476W WO 2020103598 A1 WO2020103598 A1 WO 2020103598A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
optical axis
object side
edge
extending
Prior art date
Application number
PCT/CN2019/110476
Other languages
English (en)
French (fr)
Inventor
马杰
Original Assignee
瑞声通讯科技(常州)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 瑞声通讯科技(常州)有限公司 filed Critical 瑞声通讯科技(常州)有限公司
Publication of WO2020103598A1 publication Critical patent/WO2020103598A1/zh

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/003—Light absorbing elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • 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
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens

Definitions

  • the embodiment of the utility model relates to the technical field of optical imaging, in particular to a lens module.
  • the related art lens module includes a lens barrel, a lens housed in the lens barrel, and a pressure ring that abuts the lens from the image side to fix the lens.
  • the outer diameter of the pressure ring matches the inner diameter of the lens barrel.
  • the purpose of the embodiments of the present invention is to provide a lens module that can ensure the assembly accuracy of the pressure ring and improve the yield of the lens module.
  • a lens module including a lens barrel, a lens with an optical axis housed in the lens barrel, and a pressure against the lens from the image side A ring
  • the pressing ring includes an upper surface close to the object side, a lower surface disposed opposite to the upper surface, an inner connecting surface connecting the upper surface and the lower surface, and an outer surface opposite to the inner connecting surface A connecting surface, the outer connecting surface is in contact with the lens barrel, and a convex portion extending toward the object side is provided on the upper surface, the convex portion includes a top surface, and the light is approached from the top surface An edge of the axis extending toward the image side in a direction close to the optical axis, and a second side extending from the top surface away from the optical axis toward the image side in a direction away from the optical axis,
  • the upper surface includes a first surface extending from an edge of the second side away from the optical axis in a direction away from the optical axis
  • the second side surface extends from the edge of the top surface away from the optical axis in the direction away from the optical axis toward the image side, in In the process of assembling the pressure ring into the lens barrel, the second side can also play a guiding role, further improving the assembly accuracy of the pressure ring and the yield of the lens module, and increasing the edge thickness of the lens, which can increase the lens
  • the gate is conducive to the formation of the lens.
  • the lens includes an optical portion and a bearing portion provided around the optical portion, the bearing portion includes an object side surface close to the object side, an image side surface opposite to the object side surface, and a connecting object A side surface and a peripheral surface of the image side surface, the lens barrel includes a first abutting surface abutting the peripheral surface, a second abutting surface abutting the outer connecting surface, and connecting the first abutting surface
  • An extension surface of the surface and the second abutment surface the extension surface extending from the first abutment surface in a direction away from the optical axis
  • the image side surface includes approaching the edge from the edge of the peripheral surface A second surface extending in the direction of the optical axis, a third surface extending from the edge of the second surface away from the peripheral surface toward the object side in a direction close to the optical axis, and close to the object side from the third surface Of the fourth surface extending toward the optical axis, the first surface resists the second surface, the second side resists the third surface,
  • both the top surface and the fourth surface are perpendicular to the optical axis, the end of the fourth surface away from the third surface is connected to the optical portion, and the first side surface is spaced from the lens Settings.
  • a first light shielding sheet is provided between the pressure ring and the lens, the top surface resists the first light shielding sheet from the image side, and the fourth surface resists the first light shielding from the object side sheet.
  • the material of the pressure ring is plastic, and the upper surface and the outer connecting surface are smoothly and transitionally connected.
  • it also includes a light-shielding plate provided on the object side of the lens.
  • a second light-shielding sheet is provided between the lens and the light-shielding plate.
  • the lens group also includes a lens group provided on the object side of the shading plate, the lens group includes at least five lenses stacked in order from the object side toward the image side, and the lens group bears against the lens barrel from the image side on.
  • FIG. 1 is a schematic cross-sectional structure diagram of a lens module provided by the first embodiment of the present invention
  • FIG. 2 is a partially enlarged view of part A in FIG. 1.
  • the first embodiment of the present invention relates to a lens module 100, as shown in FIGS. 1 to 2, including a lens barrel 11, a lens 12 housed in the lens barrel 11 and having an optical axis OO ′, and the image side Holds the pressure ring 13 of the lens 12,
  • the pressure ring 13 includes an upper surface 131 close to the object side, a lower surface 132 opposite to the upper surface 131, an inner connecting surface 133 connecting the upper surface 131 and the lower surface 132, and the inner connection
  • the outer connecting surface 134 opposite to the surface 133 is in contact with the lens barrel 11.
  • the upper surface 131 is provided with a convex portion 14 extending toward the object side.
  • the convex portion 14 includes a top surface 141 and is close to the top surface 141
  • the edge of the optical axis OO ' extends toward the image side in a direction close to the optical axis OO', and the edge extending away from the optical axis OO 'from the top surface 141 toward the image side in a direction away from the optical axis OO'
  • the upper surface 131 includes a first surface 1311 extending from an edge of the second side surface 143 away from the optical axis OO 'in a direction away from the optical axis OO', the first surface 1311 and the second side surface 143 both bear against the lens 12 On the top, the top surface 141 is spaced from the lens 12.
  • the assembly accuracy of the pressure ring 13 is ensured, and the yield of the lens module 100 is improved; in addition, since the second side surface 143 extends from the edge of the top surface 141 away from the optical axis OO 'in the direction away from the optical axis OO' toward the image side, During the assembly of the pressure ring 13 into the lens barrel 11, the second side 143 can also play a guiding role, further improving the assembly accuracy of the pressure ring 13 and the yield of the lens module 100, and increasing the lens 12
  • the thickness of the edge can increase the gate of the lens 12, which is beneficial to the molding of the lens 12.
  • the material of the pressure ring 13 is plastic, and the upper surface 131 and the outer connecting surface 134 are smoothly and transitionally connected.
  • the plastic lens 12 is light in weight, easy to process, and convenient to transport; it is not easy to break, and it is less shattered and has less sharpness and higher safety; the plastic lens 12 has strong anti-fog properties, which improves the imaging quality of the lens module 100; plastic lenses 12 It can prevent dents. Generally, high-heat and small-volume substances are easy to cause dents and spots on the glass sheet. However, if it encounters the plastic lens 12, it will automatically pop up and will not cause any marks on the surface of the lens 12, thereby improving the lens. The life of the module 100.
  • the lens 12 includes an optical portion 121 and a receiving portion 122 disposed around the optical portion 121.
  • the receiving portion 122 includes an object side surface 1221 near the object side, an image side surface 1222 opposite to the object side 1221, and a connector The side surface 1221 and the peripheral surface 1223 of the image side surface 1222.
  • the lens barrel 11 includes a first abutting surface 111 abutting the peripheral surface 1223, a second abutting surface 112 abutting the outer connecting surface 134, and connecting the first abutting surface 111
  • the extension surface 113 of the second contact surface 112 extends from the first contact surface 111 in a direction away from the optical axis OO.
  • the image side surface 1222 includes an edge extending from the edge of the peripheral surface 1223 toward the optical axis OO '
  • the second surface 1222a, the third surface 1222b extending from the edge of the second surface 1222a away from the peripheral surface 1223 toward the object side in the direction near the optical axis OO ', and the edge from the third surface 1222b toward the object side toward the optical axis OO
  • the fourth surface 1222c extending in the 'direction, the first surface 1311 abuts on the second surface 1222a, the second side surface 143 abuts on the third surface 1222b, and the top surface 141 is spaced apart from the fourth surface 1222c.
  • both the top surface 141 and the fourth surface 1222c are perpendicular to the optical axis OO ', the end of the fourth surface 1222c away from the third surface 1222b is connected to the optical portion 121, and the first side surface 142 is spaced apart from the lens 12.
  • a first light shielding sheet 15 is provided between the pressing ring 13 and the lens 12, the top surface 141 resists the first light shielding sheet 15 from the image side, and the fourth surface 1222c resists the first light shielding sheet 15 from the object side In this way, stray light can be better prevented from entering the lens barrel 11 and the imaging quality of the lens module 100 is improved.
  • the lens module 100 further includes a light blocking plate 16 disposed on the object side of the lens 12. In this way, stray light entering the lens barrel 11 can be reduced, thereby improving the imaging quality of the lens barrel 11.
  • a second light shielding sheet 17 is provided between the lens 12 and the light shielding plate 16, so as to further diffuse stray light and improve the imaging quality of the lens module 100.
  • the lens module 100 further includes a lens group 18 disposed on the object side of the shading plate 16, the lens group 18 includes at least five lenses stacked in order from the object side toward the image side, and the lens group 18 resists from the image side On the lens barrel 11.
  • light shielding sheets may be provided between the lenses.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Lens Barrels (AREA)
  • Blocking Light For Cameras (AREA)

Abstract

一种镜头模组（100），包括：镜筒（11）、镜片（12）、以及从像侧抵持镜片（12）的压环（13）。压环（13）包括靠近物侧的上表面（131）、下表面（132）、内连接面（133）和外连接面（134），外连接面（134）与镜筒（11）抵接，上表面（131）上设置有朝向物侧延伸的凸起部（14），凸起部（14）包括顶面（141）、自顶面（141）靠近光轴（OO'）的边缘沿靠近光轴（OO'）的方向朝像侧延伸的第一侧面（142）、以及自顶面（141）远离光轴（OO'）的边缘沿远离光轴（OO'）的方向朝像侧延伸的第二侧面（143），上表面（131）包括自第二侧面（143）远离光轴（OO'）的边缘朝远离光轴（OO'）的方向延伸的第一表面（1311），第一表面（1311）和第二侧面（143）均抵持在镜片（12）上，顶面（141）与镜片（12）间隔设置。这种镜头模组（100），能够保证压环（13）的组装精度，提高镜头模组的良品率。

Description

一种镜头模组 技术领域
本实用新型实施例涉及光学成像技术领域，特别涉及一种镜头模组。
 背景技术
随着科技的不断发展，电子设备不断地朝着智能化发展，除了数码相机外，便携式电子设备例如平板电脑、手机等也都配备了拍照摄像功能的镜头模组，以满足用户随时拍照的需要。相关技术的镜头模组包括镜筒、收容于镜筒内的镜片、以及从像侧抵持镜片以固定镜片的压环，压环的外径与镜筒的内径配合。
 技术问题
发明人发现现有技术中至少存在如下问题：由于压环的外径存在毛边，圆度较差，在组装压环的过程中容易发生偏斜，压环的组装精度不高，导致镜头模组的良品率较低。
 技术解决方案
本实用新型实施方式的目的在于提供一种镜头模组，能够保证压环的组装精度，提高镜头模组的良品率。
为解决上述技术问题，本实用新型的实施方式提供了一种镜头模组，包括镜筒、以及收容于所述镜筒内且具有光轴的镜片、以及从像侧抵持所述镜片的压环，所述压环包括靠近物侧的上表面、与所述上表面相对设置的下表面、连接所述上表面和所述下表面的内连接面、以及与所述内连接面相对的外连接面，所述外连接面与所述镜筒抵接，所述上表面上设置有朝向物侧延伸的凸起部，所述凸起部包括顶面、自所述顶面靠近所述光轴的边缘沿靠近所述光轴的方向朝像侧延伸的第一侧面、以及自所述顶面远离所述光轴的边缘沿远离所述光轴的方向朝像侧延伸的第二侧面，所述上表面包括自所述第二侧面远离光轴的边缘朝远离所述光轴的方向延伸的第一表面，所述第一表面和所述第二侧面均抵持在所述镜片上，所述顶面与所述镜片间隔设置。
 有益效果
本实用新型实施方式相对于现有技术而言，由于所述第一表面和所述第二侧面均抵持在所述镜片上，故所述镜片对所述压环的作用力中存在沿垂直于所述光轴、且朝向所述光轴的分量，即形成坎合结构，从而压环无需通过外径与镜筒配合，避免了压环外径存在毛边导致压环组装发生偏斜的问题，保证了压环的组装精度，提高了镜头模组的良品率；另外，由于第二侧面自所述顶面远离所述光轴的边缘沿远离所述光轴的方向朝像侧延伸，在压环组入镜筒的过程中，第二侧面也能起到导正的作用，进一步提高了压环的组装精度和镜头模组的良品率、并且增加了镜片的边缘厚度，能够增大镜片的浇口，有利于镜片的成型。
另外，所述镜片包括光学部、以及环绕所述光学部设置的承靠部，所述承靠部包括靠近物侧的物侧面、与所述物侧面相对设置的像侧面、以及连接所述物侧面和所述像侧面的周缘面，所述镜筒包括抵接所述周缘面的第一抵接面、与所述外连接面抵接的第二抵接面以及连接所述第一抵接面与所述第二抵接面的延伸面，所述延伸面自所述第一抵接面朝远离所述光轴的方向延伸，所述像侧面包括自所述周缘面边缘朝靠近所述光轴的方向延伸的第二表面、自所述第二表面远离所述周缘面的边缘沿靠近所述光轴的方向朝物侧延伸的第三表面、以及自所述第三表面靠近物侧的边缘朝靠近所述光轴的方向延伸的第四表面，所述第一表面抵持在所述第二表面上，所述第二侧面抵持在所述第三表面上，所述顶面与所述第四表面间隔设置。
另外，所述顶面与所述第四表面均垂直于所述光轴，所述第四表面远离所述第三表面的一端与所述光学部连接，所述第一侧面与所述镜片间隔设置。
另外，所述压环和所述镜片之间设置有第一遮光片，所述顶面从像侧抵持所述第一遮光片，所述第四表面从物侧抵持所述第一遮光片。如此设置，能够更好的防止杂散光进入镜筒，提高了镜头模组的成像质量。
另外，所述压环的材质为塑胶，所述上表面与所述外连接面平滑过渡连接。
另外，还包括设置在所述镜片物侧的遮光板。如此设置，能够减少进入所述镜筒的杂光，从而提高所述镜筒的成像质量。
另外，所述镜片与所述遮光板之间设置有第二遮光片。
另外，还包括设置在所述遮光板物侧的透镜组，所述透镜组包括自物侧朝像侧依次叠设的至少五片透镜，所述透镜组从像侧抵持在所述镜筒上。
 附图说明
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定，附图中具有相同参考数字标号的元件表示为类似的元件，除非有特别申明，附图中的图不构成比例限制。
图1是本实用新型第一实施方式提供的镜头模组的剖面结构示意图；
图2是图1中A部的局部放大图。
 本发明的实施方式
为使本实用新型实施例的目的、技术方案和优点更加清楚，下面将结合附图对本实用新型的各实施方式进行详细的阐述。然而，本领域的普通技术人员可以理解，在本实用新型各实施方式中，为了使读者更好地理解本实用新型而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施方式的种种变化和修改，也可以实现本实用新型所要求保护的技术方案。
本实用新型的第一实施方式涉及一种镜头模组100，如图1至2所示，包括镜筒11、以及收容于镜筒11内且具有光轴OO'的镜片12、以及从像侧抵持镜片12的压环13，压环13包括靠近物侧的上表面131、与上表面131相对设置的下表面132、连接上表面131和下表面132的内连接面133、以及与内连接面133相对的外连接面134，外连接面134与镜筒11抵接，上表面131上设置有朝向物侧延伸的凸起部14，凸起部14包括顶面141、自顶面141靠近光轴OO'的边缘沿靠近光轴OO'的方向朝像侧延伸的第一侧面142、以及自顶面141远离光轴OO'的边缘沿远离光轴OO'的方向朝像侧延伸的第二侧面143，上表面131包括自第二侧面143远离光轴OO'的边缘朝远离光轴OO'的方向延伸的第一表面1311，第一表面1311和第二侧面143均抵持在镜片12上，顶面141与镜片12间隔设置。
本实用新型实施方式相对于现有技术而言，由于第一表面1311和第二侧面143均抵持在镜片12上，故镜片12对压环13的作用力中存在沿垂直于光轴OO'、且朝向光轴OO'的分量，即形成坎合结构，从而压环13无需通过外径与镜筒11配合，避免了压环13外径存在毛边导致压环13组装发生偏斜的问题，保证了压环13的组装精度，提高了镜头模组100的良品率；另外，由于第二侧面143自顶面141远离光轴OO'的边缘沿远离光轴OO'的方向朝像侧延伸，在压环13组入镜筒11的过程中，第二侧面143也能起到导正的作用，进一步提高了压环13的组装精度和镜头模组100的良品率、并且增加了镜片12的边缘厚度，能够增大镜片12的浇口，有利于镜片12的成型。
本实施方式中，压环13的材质为塑胶，上表面131与外连接面134平滑过渡连接。 塑胶镜片12重量轻，易加工、运输方便；不易破裂、且被击碎碎片少又较不尖锐安全性更高；塑胶镜片12防雾性强，提高了镜头模组100的成像质量；塑胶镜片12可防凹痕，一般高热小体积物质容易在玻璃片造成凹痕和斑点，但若碰到塑料镜片12时，就会自动弹开，不会在镜片12表面造成任何痕迹，从而提高了镜头模组100的寿命。
具体的说，镜片12包括光学部121、以及环绕光学部121设置的承靠部122，承靠部122包括靠近物侧的物侧面1221、与物侧面1221相对设置的像侧面1222、以及连接物侧面1221和像侧面1222的周缘面1223，镜筒11包括抵接周缘面1223的第一抵接面111、与外连接面134抵接的第二抵接面112以及连接第一抵接面111与第二抵接面112的延伸面113，延伸面113自第一抵接面111朝远离光轴OO的方向延伸，像侧面1222包括自周缘面1223边缘朝靠近光轴OO'的方向延伸的第二表面1222a、自第二表面1222a远离周缘面1223的边缘沿靠近光轴OO'的方向朝物侧延伸的第三表面1222b、以及自第三表面1222b靠近物侧的边缘朝靠近光轴OO'的方向延伸的第四表面1222c，第一表面1311抵持在第二表面1222a上，第二侧面143抵持在第三表面1222b上，顶面141与第四表面1222c间隔设置。
可选的，顶面141与第四表面1222c均垂直于光轴OO'，第四表面1222c远离第三表面1222b的一端与光学部121连接，第一侧面142与镜片12间隔设置。
值得一提的是，压环13和镜片12之间设置有第一遮光片15，顶面141从像侧抵持第一遮光片15，第四表面1222c从物侧抵持第一遮光片15，如此设置，能够更好的防止杂散光进入镜筒11，提高了镜头模组100的成像质量。
本实施方式中，镜头模组100还包括设置在镜片12物侧的遮光板16，如此设置，能够减少进入镜筒11的杂光，从而提高镜筒11的成像质量。可选的，镜片12与遮光板16之间设置有第二遮光片17，从而进一步放杂光，提高镜头模组100的成像质量。
具体的说，镜头模组100还包括设置在遮光板16物侧的透镜组18，透镜组18包括自物侧朝像侧依次叠设的至少五片透镜，透镜组18从像侧抵持在镜筒11上。另外，各个镜片之间也可以设置遮光片。
本领域的普通技术人员可以理解，上述各实施方式是实现本实用新型的具体实施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本实用新型的精神和范围。

Claims (8)

  1. 一种镜头模组，包括镜筒、以及收容于所述镜筒内且具有光轴的镜片、以及从像侧抵持所述镜片的压环，其特征在于，所述压环包括靠近物侧的上表面、与所述上表面相对设置的下表面、连接所述上表面和所述下表面的内连接面、以及与所述内连接面相对的外连接面，所述外连接面与所述镜筒抵接，所述上表面上设置有朝向物侧延伸的凸起部，所述凸起部包括顶面、自所述顶面靠近所述光轴的边缘沿靠近所述光轴的方向朝像侧延伸的第一侧面、以及自所述顶面远离所述光轴的边缘沿远离所述光轴的方向朝像侧延伸的第二侧面，所述上表面包括自所述第二侧面远离光轴的边缘朝远离所述光轴的方向延伸的第一表面，所述第一表面和所述第二侧面均抵持在所述镜片上，所述顶面与所述镜片间隔设置。
  2. 根据权利要求1所述的镜头模组，其特征在于，所述镜片包括光学部、以及环绕所述光学部设置的承靠部，所述承靠部包括靠近物侧的物侧面、与所述物侧面相对设置的像侧面、以及连接所述物侧面和所述像侧面的周缘面，所述镜筒包括抵接所述周缘面的第一抵接面、与所述外连接面抵接的第二抵接面以及连接所述第一抵接面与所述第二抵接面的延伸面，所述延伸面自所述第一抵接面朝远离所述光轴的方向延伸，所述像侧面包括自所述周缘面边缘朝靠近所述光轴的方向延伸的第二表面、自所述第二表面远离所述周缘面的边缘沿靠近所述光轴的方向朝物侧延伸的第三表面、以及自所述第三表面靠近物侧的边缘朝靠近所述光轴的方向延伸的第四表面，所述第一表面抵持在所述第二表面上，所述第二侧面抵持在所述第三表面上，所述顶面与所述第四表面间隔设置。
  3. 根据权利要求2所述的镜头模组，其特征在于，所述顶面与所述第四表面均垂直于所述光轴，所述第四表面远离所述第三表面的一端与所述光学部连接，所述第一侧面与所述镜片间隔设置。
  4. 根据权利要求2所述的镜头模组，其特征在于，所述压环和所述镜片之间设置有第一遮光片，所述顶面从像侧抵持所述第一遮光片，所述第四表面从物侧抵持所述第一遮光片。
  5. 根据权利要求1所述的镜头模组，其特征在于，所述压环的材质为塑胶，所述上表面与所述外连接面平滑过渡连接。
  6. 根据权利要求1所述的镜头模组，其特征在于，还包括设置在所述镜片物侧的遮光板。
  7. 根据权利要求6所述的镜头模组，其特征在于，所述镜片与所述遮光板之间设置有第二遮光片。
  8. 根据权利要求6所述的镜头模组，其特征在于，还包括设置在所述遮光板物侧的透镜组，所述透镜组包括自物侧朝像侧依次叠设的至少五片透镜，所述透镜组从像侧抵持在所述镜筒上。
     
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