WO2021189452A1 - 一种小型化的高成像质量的近距离成像模组 - Google Patents

一种小型化的高成像质量的近距离成像模组 Download PDF

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Publication number
WO2021189452A1
WO2021189452A1 PCT/CN2020/081795 CN2020081795W WO2021189452A1 WO 2021189452 A1 WO2021189452 A1 WO 2021189452A1 CN 2020081795 W CN2020081795 W CN 2020081795W WO 2021189452 A1 WO2021189452 A1 WO 2021189452A1
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lens group
distance
imaging module
focus
range
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PCT/CN2020/081795
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English (en)
French (fr)
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胡庆磊
黄凯
李宁
李梦婷
李培
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肯维捷斯（武汉）科技有限公司
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Priority to PCT/CN2020/081795 priority Critical patent/WO2021189452A1/zh
Publication of WO2021189452A1 publication Critical patent/WO2021189452A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances
    • 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

Definitions

  • the invention relates to the field of optical imaging, in particular to a miniaturized high imaging quality close-range imaging module.
  • imaging devices have given people more and more convenience in daily life. People's requirements for imaging devices are not limited to imaging quality. Small size and portability have also become an important factor for people to choose imaging devices. First, while ensuring high imaging quality, the development of miniaturization is also crucial.
  • the existing macro camera for mobile phones uses a method of increasing the distance between the lens and the detector to achieve macro imaging, that is, using the object distance and image distance relationship of optical imaging, and reducing the object distance by increasing the image distance to achieve macro imaging , If the application number is 201811206371.X Chinese invention patent public documents.
  • the main disadvantages of this scheme are: 1) The image distance must be increased to be able to perform super macro imaging (the distance between the object and the front face of the camera is less than or equal to 20 mm), resulting in a long distance from the lens to the detector, which is not conducive to the miniaturization of the camera , And in order to take into account infinity imaging and super macro imaging, a focusing motor with a large stroke must be used, which also leads to a larger overall camera size; 2) The optimal imaging range of the lens is limited, and this design is designed to take into account infinite imaging And ultra-macro imaging, the lens needs to optimize both infinite object distance and ultra-short object distance imaging. This is less feasible from the perspective of optical design, resulting in the imaging quality even if the image distance is increased to achieve ultra-macro There will also be a large loss, resulting in poor results under super macro imaging.
  • a lens with positive power can also be used to achieve macro imaging on the original mobile phone lens.
  • a Chinese invention patent with application number 201510275482.6 discloses a mobile phone with an external convex lens. The convex lens can be moved and the convex lens can be moved. Macro photography can be achieved just in front of the mobile phone camera. This solution has better imaging quality than the aforementioned solution of increasing the distance of the lens to achieve super macro.
  • the Chinese invention patent publication with the application number 201811003701.5 discloses a scheme for realizing super-macro imaging through an external lens, and its working distance is millimeter-level. The advantage of this scheme is that it can achieve high-quality super-macro imaging by using a specially optimized external super-macro lens.
  • the imaging depth of field is very shallow, and the focus needs to be adjusted during use.
  • This solution uses the mobile phone's automatic focusing camera module to adjust the focus.
  • magnification of the super macro imaging is close to 1 or greater than or equal to 1, the optical system theory of geometric optics can be used to obtain the focusing range (that is, the moving range of the object surface). ) Is less than the motor stroke, resulting in wasted motor stroke, and the motor stroke is an important factor restricting the size of the camera module.
  • the motor stroke is usually not large, which eventually leads to a too small focus range.
  • the Chinese Invention Patent Publication with the application number 201910651974.9 discloses the structure of a super macro lens.
  • the super macro imaging performance of the lens is excellent and can reach the degree of cell and subcellular resolution.
  • the Chinese Invention Patent Publication with the application number 201910704120.2 discloses a camera module structure based on the super macro lens.
  • the module structure can work in a fixed focus mode without a focusing structure; it can also be combined with a focusing motor.
  • Automatic focusing function clear imaging within a certain range of the object.
  • the focusing motor drives the entire module to move relative to the detection surface.
  • the focusing range is always smaller than the stroke of the focusing motor. As mentioned above, this causes the miniaturized ultra-macro camera module to have a too small focusing range in this working mode, which cannot meet the needs of macro observation in different scenes.
  • the Chinese Invention Patent Publication with the application number 201910596432.6 discloses a mobile communication device with microscopic imaging function.
  • the mobile communication device has a camera module with a focusing function.
  • the module contains two lenses, which can be adjusted by moving the object-side lens separately.
  • the focusing solution of the module can utilize the stroke of the focusing mechanism more effectively, thereby facilitating the miniaturization of the module.
  • Miniaturized macro and micro imaging modules have great application prospects in biomedicine and other fields, especially in the field of portable biomedical imaging instruments. This field has special requirements for imaging quality and focusing distance. At present, there is a lack of miniaturized macro and microscopic imaging modules suitable for this field.
  • the technical problem to be solved by the present invention is to provide a miniaturized high imaging quality close-range imaging module in view of the defects of the prior art.
  • the technical solution adopted by the present invention to solve its technical problems is to construct a miniaturized high imaging quality close-range imaging module, which includes a first lens group, a second lens group, and a photosensitive module arranged in sequence from the object side to the image side. Chip; and, a focus motor for driving only the first lens group or the second lens group to move to achieve focus adjustment;
  • the first lens group and the second lens group form a lens group
  • the distance from the object surface of the lens group to the image surface on the optical axis is TTL
  • the object side surface to the image side surface of the lens group is in the optical axis.
  • the distance on the axis is TD, which satisfies the following relationship: 0.15 ⁇ TD/TTL ⁇ 0.9;
  • the focal length f 1 of the first lens group and the focal length f 2 of the second lens group satisfy the following relationship: 0.1 ⁇ f 1 /f 2 ⁇ 10;
  • the length of the optical tube of the lens group satisfies the following relationship: 0.2 ⁇ TTL/( f 1 +f 2 ) ⁇ 15;
  • the distance L Obj from the object principal plane of the first lens group to the object surface satisfies the following relationship: 0.5f 1 ⁇ L Obj ⁇ 1.5f 1 ;
  • the distance L Ima from the principal image plane of the second lens group to the image plane satisfies the following relationship: 0.5f 2 ⁇ L Ima ⁇ 1.5f 2 .
  • the first lens group and the second lens group both have positive refractive power, and each includes at least three lenses.
  • the object plane closest to the imaging module is a close-focus object plane
  • the object plane farthest from the imaging module Is a far-focus object surface
  • the object side of the lens group includes a limit surface, and a direction away from the imaging module is a positive direction;
  • the near-focus object surface is located within ⁇ 50 ⁇ m of the limit surface, and the distance between the far-focus object surface and the limit surface is ⁇ 220 ⁇ m.
  • the focus motor drives the first lens group to move, the position of the second lens group is fixed; at this time, the near-focus object plane is when the distance between the first lens group and the second lens group is the smallest , The object plane focused by the lens group;
  • the focus motor drives the second lens group to move, the position of the first lens group is fixed; at this time, the near-focus object plane is when the distance between the first lens group and the second lens group is the smallest , The object plane focused by the lens group.
  • the stroke of the focus motor is ⁇ 300 ⁇ m and ⁇ 600 ⁇ m.
  • the focus distance is the same as the stroke of the focus motor.
  • the minimum distance between the first lens group and the second lens group is ⁇ 50 ⁇ m.
  • the miniaturized high imaging quality close-range imaging module of the present invention further includes a filter arranged in front of the photosensitive chip for filtering out unwanted wavelengths of light.
  • the miniaturized and high imaging quality close-range imaging module of the present invention further includes a protective glass arranged in front of the lens group, and the object surface of the protective glass is a limit surface.
  • the minimum distance between the first lens group and the protective glass is ⁇ 50 ⁇ m.
  • the structure of the miniaturized high imaging quality close-range imaging module does not need to increase the image distance to achieve close-range imaging, so the entire module volume can be miniaturized;
  • the entire lens group is divided into two parts, the first lens group and the second lens group, which are different from the common focusing method of the entire lens.
  • the focus motor only drives one of the lens groups to adjust the focus, which can effectively reduce the motor load.
  • FIG. 1 is a schematic diagram of a close-focus situation of a first embodiment of a miniaturized high-imaging-quality close-range imaging module of the present invention
  • FIG. 2 is a schematic diagram of a far focus situation of the first embodiment of the miniaturized high imaging quality close-range imaging module of the present invention
  • FIG. 3 is a schematic diagram of a close focus situation of a second embodiment of the miniaturized and high imaging quality close-range imaging module of the present invention.
  • FIG. 4 is a schematic diagram of a far focus situation of a second embodiment of the miniaturized and high imaging quality close-range imaging module of the present invention.
  • orientation or positional relationship indicated by “front”, “rear”, “upper”, “lower”, etc. is based on the orientation or positional relationship shown in the drawings, constructed and operated in a specific orientation, and is only for It is convenient to describe the technical solution, rather than indicating that the pointed device or element must have a specific orientation, so it cannot be understood as a limitation of the present utility model.
  • the present invention constructs a miniaturized high imaging quality close-range imaging module suitable for close-range imaging, including a first lens group 10, a second lens group 11 and a photosensitive chip 15 arranged in sequence from the object side to the image side And, a focus motor 12 for driving only the first lens group 10 or the second lens group 11 to move to achieve focus adjustment.
  • a diaphragm may be further provided between the first lens group 10 and the second lens group 11, and the first lens group 10 and the second lens group 11 respectively include at least three lenses.
  • the first lens group 10 and the second lens group 11 form an approximate infinity-corrected microscope structure.
  • the first lens group 10 and the second lens group 11 have positive refractive power.
  • the first lens group 10 is equivalent to the objective lens of the microscope, and the second lens Group 11 is equivalent to the tube lens of a microscope.
  • the focusing motor 12 drives the first lens group 10 or the second lens group 11 to achieve focusing, that is, to change the position of the object plane of the imaging module.
  • the object plane closest to the imaging module is the near-focus object plane
  • the object plane farthest from the imaging module is the far-focus object plane
  • the direction away from the imaging module is the positive direction.
  • the first lens group 10 and the second lens group 11 form a lens group, which includes a limit surface on the object side of the lens group.
  • the object side surface of the protective glass 17 is the limit surface ;
  • the end surface of the shell of the imaging module or other mechanical structure that cooperates with the imaging module is the limit surface.
  • the near-focus object surface is within ⁇ 50 ⁇ m of the limit surface, and the distance between the far-focus object surface and the limit surface is ⁇ 220 ⁇ m.
  • the stroke of the focus motor 12 is ⁇ 300 ⁇ m and ⁇ 600 ⁇ m, and when the focus motor 12 drives the first lens group 10 to move, the focus distance is the same as the stroke of the focus motor 12.
  • the minimum distance between the first lens group 10 and the second lens group 11 is ⁇ 50 ⁇ m.
  • the minimum distance between the first lens group 10 and the protective glass 17 is ⁇ 50 ⁇ m.
  • the near-focus object surface can cover the short-distance area of the protective glass 17 and can image close objects. At the same time, the far-focus object surface can surpass the cover glass commonly used in microscopes to meet the needs of biomedical imaging;
  • the 12 stroke of the focusing motor can effectively cover the dimensional tolerances of the components in the module due to processing and installation, which improves the manufacturability of mass production;
  • the near-focus object plane at this time is the object plane on which the lens group focuses when the distance between the first lens group 10 and the second lens group 11 is the smallest;
  • the near-focus object plane at this time is the object plane on which the lens group focuses when the distance between the first lens group 10 and the second lens group 11 is the smallest.
  • the distance from the object surface to the image surface of the lens group composed of the first lens group 10 and the second lens group 11 on the optical axis is TTL, and the distance from the object side surface to the image side surface of the lens group on the optical axis is TD , which satisfies the following relationship: 0.15 ⁇ TD/TTL ⁇ 0.9;
  • the optical tube length of the lens group satisfies the following relationship: 0.2 ⁇ TTL/( f 1 +f 2 ) ⁇ 15;
  • the distance L Obj from the principal plane of the object side of the first lens group 10 to the object plane satisfies the following relationship: 0.5f 1 ⁇ L Obj ⁇ 1.5f 1 ;
  • the distance L Ima from the principal plane of the image side of the second lens group 11 to the image plane satisfies the following relationship: 0.5f 2 ⁇ L Ima ⁇ 1.5f 2 .
  • the imaging module satisfies the above conditions during the entire focus stroke.
  • the focusing motor 12 may be a voice coil motor, an ultrasonic motor, a stepping motor, a memory alloy motor, or the like.
  • the miniaturized high imaging quality close-range imaging module further includes a filter 18 arranged in front of the photosensitive chip 15 to filter out unwanted wavelengths of light so as not to affect the imaging effect.
  • the structure of the miniaturized high imaging quality close-range imaging module does not need to increase the image distance to achieve close-range imaging, so the entire module volume can be miniaturized;
  • the entire lens group is divided into two parts, the first lens group and the second lens group.
  • the focusing motor in the present invention only drives one of the lens groups for focusing, which can effectively reduce the motor load. And when the focusing motor drives the first lens group to move, the focusing distance is the same as the stroke of the focusing motor, and there will be no situation where the focusing distance is less than the stroke of the motor, and the waste of the motor stroke is avoided.
  • the first embodiment provides a miniaturized and high imaging quality close-range imaging module, which is arranged according to the optical path and includes a first lens group 10 and a second lens group 10 and a second lens group arranged in sequence from the object side to the image side.
  • the lens group 11, the photosensitive chip 15, and a focus motor 12 for driving the first lens group 10 to move to achieve focus adjustment.
  • the first lens group 10 and the second lens group 11 form a lens group
  • the distance TTL from the object surface to the image surface of the lens group on the optical axis is 8 mm
  • the distance TD from the object side surface to the image side surface on the optical axis is 6 mm.
  • the first lens group 10 is installed on a movable carrier (not shown in the figure) of the focusing motor 12 by dispensing glue or other fixing methods.
  • the focus motor 12 may be a voice coil motor, an ultrasonic motor, a memory alloy motor, etc., and the stroke of the focus motor 12 is 300 ⁇ m.
  • the lens barrel 13 for fixing the second lens group 11
  • the lens barrel 13 has an internal thread
  • the second lens group 11 has an external thread, and the two are connected by threads.
  • the focus motor 12 drives the first lens group 10 to move to achieve the function of focusing, and the position of the second lens group 11 in the imaging light path is fixed.
  • the photosensitive chip 15 is disposed on the circuit board 16, and the circuit board 16 includes, but is not limited to, a printed circuit board, a flexible circuit board, and the like.
  • the photosensitive chip 15 is fixedly placed at the image-side focal plane of the second lens group 11, and the light condensed by the second lens group 11 is incident on the photosensitive chip 15, and the photosensitive chip 15 performs photoelectric conversion on the sensed light.
  • the photosensitive chip 15 is an area array type optoelectronic device.
  • the photosensitive chip 15 is a CMOS image sensor or a CCD image sensor.
  • the miniaturized high imaging quality close-range imaging module further includes a housing 14 for fixing the first lens group 10, the second lens group 11, the focus motor 12, the photosensitive chip 16, and the like.
  • the near-focus object surface 21 is located 50 ⁇ m inside the upper surface of the housing 14.
  • the afocal object surface 22 is located 300 ⁇ m outside the upper surface of the housing 14.
  • the distance between the first lens group 10 and the upper surface of the housing 14 is 900 ⁇ m, and the distance between the first lens group 10 and the second lens group 11 is 0.15 mm.
  • the distance from the first lens group 10 to the upper surface of the housing 14 is 550 ⁇ m.
  • a filter 18 is added in front of the photosensitive chip 15, and a protective glass 17 is added in the front of the imaging module.
  • the focus adjustment method is The focus motor 12 drives the second lens group 11 to move, the first lens group 10 is fixed on the lens barrel 13, the lens barrel 13 has internal threads, and the first lens group 10 has external threads, and the two are connected by threads.
  • the focus motor 12 drives the second lens group 11 to move to achieve the function of focusing, and the position of the first lens group 10 in the imaging light path is fixed.
  • the first lens group 10 and the second lens group 11 form a lens group
  • the distance TTL from the object surface to the image surface of the lens group on the optical axis is 10 mm
  • the distance TD from the object side surface to the image side surface on the optical axis is 7 mm.
  • the filter 18 is arranged between the second lens group 11 and the photosensitive chip 15, and can be fixed on the housing 14 by glue or other means, or can be directly glued to the image side of the second lens group 11, or it can be placed in close contact with the image side of the second lens group 11 Above the photosensitive chip 15.
  • the filter 18 is used to filter out light that is not desired to be detected by the photosensitive chip. In some embodiments, it may be a reflective filter or an absorption filter.
  • the protective glass 17 is installed in front of the first lens group 10 and has a thickness of 0.5 mm to protect the lens.
  • a preferred solution is to add a layer of buffer material between the protective glass 17 and the focusing motor 12, including but not limited to foam Plastic and other materials.
  • the filter 18 and the protective glass 17 can be selected according to the actual needs of the user, and whether the two are used does not affect the core imaging function of the module.
  • the nearest imaging surface of the imaging module must start at least from the outer surface of the protective glass 17 to ensure that the object surface is outside the protective glass 17 in the entire focusing range.
  • the near-focus object surface 21 of this embodiment is located on the upper surface of the protective glass 17.
  • the afocal object surface is located about 200 ⁇ m outside the upper surface of the protective glass 17.
  • the distance between the first lens group 10 and the second lens group 11 is 0.4 mm.
  • the distance between the first lens group 10 and the second lens group 11 is 0.05 mm.

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Abstract

本发明公开了构造一种小型化的高成像质量的近距离成像模组，包括从物方至像方依次设置的第一透镜组、第二透镜组和感光芯片；以及用于只带动第一透镜组或第二透镜组移动以实现调焦的调焦马达。通过实施本发明，该成像镜头模组的结构无需通过增大像距来实现近距离成像，所以整个模组体积可以做到小型化。并且整个镜头组分为两个部分，第一透镜组和第二透镜组，调焦马达只带动其中一个透镜组进行调焦，可以有效减小马达负载。

Description

一种小型化的高成像质量的近距离成像模组 技术领域
本发明涉及光学成像领域，尤其涉及一种小型化的高成像质量的近距离成像模组。
 背景技术
随着成像技术的发展，成像装置在日常生活中给予了人们越来越多的便利，人们对于成像装置的要求也不仅仅局限于成像质量，小型便携化也成为人们选择成像装置的重要因素之一，因此在保证了较高的成像质量的同时，小型化发展也至关重要。
随着成像装置的普及，人们利用成像装置所探索的世界已经不仅仅局限于宏观世界，微观世界的奥秘也吸引着越来越多的人，人们也希望能观察到近距离的微小事物。目前已经出现了手机用的外置微距镜头，以及专门的手机微距摄像头，可以让用户方便的随时随地拍摄微观物体。
现有的手机微距摄像头，采用的是增加镜头到探测器距离的方法以实现微距成像，即利用光学成像的物距、像距关系，通过增加像距来减少物距以实现微距成像，如申请号为201811206371.X 的中国发明专利公开文件。该方案的主要缺点是：1）必须增大像距才能够进行超微距（物体到摄像头前端面距离小于等于20 mm）成像，导致镜头到探测器的距离较远，不利于摄像头的小型化，且为兼顾无限远成像和超微距成像，必须用很大行程的调焦马达，也导致摄像头整体尺寸较大；2）镜头的最佳成像范围是有限的，该设计为了兼顾无限远成像和超微距成像，需要镜头同时对无限远物距和超短物距成像进行优化，这从光学设计角度来讲可行性较低，导致即便增大像距实现了超微距，其成像质量也会有较大损失，导致超微距成像下的效果不佳。
在原有手机镜头上外置一个正光焦度的镜头也可实现微距成像，如申请号为201510275482.6的中国发明专利公开了一种带有外置凸透镜的手机，该凸透镜可移动，将该凸透镜移动至手机摄像头前方即可实现微距拍照。该方案相比前述对镜头进行增距以实现超微距的方案，其成像质量可以更好。例如申请号为201811003701.5的中国发明专利公开文本公开了一种通过外置镜头实现超微距成像的方案，其工作距离为毫米级。该方案的好处是，利用特殊优化的外置超微距镜头，可实现高质量的超微距成像。超微距成像时，成像景深很浅，使用时需要进行调焦。该方案使用手机自动调焦摄像模组进行调焦，当超微距成像的放大率接近1或者大于等于1时，由几何光学的光具组理论可得，调焦范围（即物面移动范围）小于马达行程，导致马达行程被浪费，而马达行程是制约摄像头模组体积的重要因素，为了实现小型化通常马达行程都不大，最终导致调焦范围过小。
申请号为201910651974.9的中国发明专利公开文本公开了一种超微距镜头的结构，该镜头的超微距成像性能优异，可以达到细胞和亚细胞分辨的程度。申请号为201910704120.2的中国发明专利公开文本公开了一种基于该超微距镜头的摄像头模组结构，该模组结构可无调焦结构，在定焦模式下工作；也可以结合调焦马达实现自动调焦功能，在物方一定范围内清晰成像。在自动调焦时，调焦马达带动整个模组相对于探测面运动，由光学成像理论可知，调焦范围始终小于调焦马达的行程。如前文所述，这造成微型化的超微距摄像头模组在这种工作模式下调焦范围过小，无法满足不同场景的微距观察需要。
申请号为201910596432.6的中国发明专利公开文本公开了一种具有微观成像功能的移动通讯设备，该移动通讯设备中具备有调焦功能的摄像头模组。该模组包含两个镜头，可通过单独移动物方镜头实现调焦。该模组的调焦方案相比前述调焦方案，能更有效的利用调焦机构的行程，从而利于模组的小型化。
小型化的微距及显微成像模组，在生物医学等领域，尤其是便携式生物医学成像仪器领域中极具应用前景。该领域对成像质量、调焦距离等均有特殊要求。目前缺乏适用于该领域的小型化的微距及显微成像模组。
 技术问题
本发明要解决的技术问题在于，针对现有技术的缺陷，提供一种小型化的高成像质量的近距离成像模组。
 技术解决方案
本发明解决其技术问题所采用的技术方案是：构造一种小型化的高成像质量的近距离成像模组，包括从物方至像方依次设置的第一透镜组、第二透镜组和感光芯片；以及，用于只带动所述第一透镜组或所述第二透镜组移动以实现调焦的调焦马达；
其中，所述第一透镜组和第二透镜组组成镜头组，所述镜头组的物面至像面于光轴上的距离为TTL，所述镜头组的物侧表面至像侧表面于光轴上的距离为TD，其满足如下关系：0.15≤TD/TTL≤0.9；
所述第一透镜组的焦距f 1和所述第二透镜组的焦距f 2之间满足如下关系：0.1≤f 1/f 2≤10；
所述镜头组的光学筒长满足如下关系：0.2≤TTL/( f 1+f 2)≤15；
所述第一透镜组的物方主平面至所述物面的距离L Obj满足如下关系：0.5f 1≤L Obj≤1.5f 1；
所述第二透镜组的像方主平面到所述像面的距离L Ima满足如下关系式：0.5f 2≤L Ima≤1.5f 2。
优选地，在本发明所述的小型化的高成像质量的近距离成像模组中，所述第一透镜组和所述第二透镜组均为正光焦度，分别至少包括三片透镜。
优选地，在本发明所述的小型化的高成像质量的近距离成像模组中，距离所述成像模组最近的物面为近焦物面，距离所述成像模组最远的物面为远焦物面，所述镜头组的物侧包含一个限位面，以远离所述成像模组的方向为正方向；
所述近焦物面位于所述限位面±50 μm范围内，所述远焦物面与所述限位面的距离≥220 μm。
优选地，在本发明所述的小型化的高成像质量的近距离成像模组中，
所述调焦马达带动所述第一透镜组移动时，所述第二透镜组位置固定；此时的所述近焦物面为所述第一透镜组与所述第二透镜组距离最小时，所述镜头组所对焦的物面；
所述调焦马达带动所述第二透镜组移动时，所述第一透镜组位置固定；此时的所述近焦物面为所述第一透镜组与所述第二透镜组距离最小时，所述镜头组所对焦的物面。
优选地，在本发明所述的小型化的高成像质量的近距离成像模组中，所述调焦马达的行程≥300 μm且≤600 μm。
优选地，在本发明所述的小型化的高成像质量的近距离成像模组中，当调焦马达带动所述第一透镜组移动时，调焦距离与所述调焦马达的行程相同。
优选地，在本发明所述的小型化的高成像质量的近距离成像模组中，在调焦范围内，所述第一透镜组和所述第二透镜组的最小距离≥50 μm。
优选地，在本发明所述的小型化的高成像质量的近距离成像模组中，还包括设于所述感光芯片前方的滤光片，用于将不需要的波段的光线滤除。
优选地，在本发明所述的小型化的高成像质量的近距离成像模组中，还包括设于所述镜头组前方的保护玻璃，所述保护玻璃的物方表面为限位面。
优选地，在本发明所述的小型化的高成像质量的近距离成像模组中，在调焦范围内，所述第一透镜组和所述保护玻璃的最小距离≥50 μm。
 有益效果
通过实施本发明，具有以下有益效果：
该小型化的高成像质量的近距离成像模组的结构无需通过增大像距来实现近距离成像，所以整个模组体积可以做到小型化；
整个镜头组分为两个部分，第一透镜组和第二透镜组，与常见的整个镜头调焦方式不同，本发明中调焦马达只带动其中一个透镜组进行调焦，可以有效减小马达负载。
 附图说明
下面将结合附图及实施例对本发明作进一步说明，附图中：
图1是本发明小型化的高成像质量的近距离成像模组第一实施例的近焦情形示意图；
图2是本发明小型化的高成像质量的近距离成像模组第一实施例的远焦情形示意图；
图3是本发明小型化的高成像质量的近距离成像模组第二实施例的近焦情形示意图；
图4是本发明小型化的高成像质量的近距离成像模组第二实施例的远焦情形示意图。
 本发明的实施方式
为了对本发明的技术特征、目的和效果有更加清楚的理解，现对照附图详细说明本发明的具体实施方式。
需要理解的是，“前”、“后”、“上”、“下”等指示的方位或位置关系为基于附图所示的方位或位置关系、以特定的方位构造和操作，仅是为了便于描述本技术方案，而不是指示所指的装置或元件必须具有特定的方位，因此不能理解为对本实用新型的限制。
本发明构造了一种小型化的高成像质量的近距离成像模组，适用于近距离成像，包括从物方至像方依次设置的第一透镜组10、第二透镜组11和感光芯片15；以及，用于只带动第一透镜组10或第二透镜组11移动以实现调焦的调焦马达12。
在一些实施例中，在第一透镜组10和第二透镜组11之间还可设置有光阑，第一透镜组10和第二透镜组11分别至少包括三片透镜。第一透镜组10和第二透镜组11组成近似无限远校正显微镜结构，第一透镜组10和第二透镜组11均为正光焦度，第一透镜组10相当于显微镜的物镜，第二透镜组11相当于显微镜的筒镜。
调焦马达12带动第一透镜组10或第二透镜组11实现调焦，即改变本成像模组的物面位置。其中，距离本成像模组最近的物面为近焦物面，距离本成像模组最远的物面为远焦物面，并以远离本成像模组的方向为正方向。第一透镜组10和第二透镜组11组成镜头组，在镜头组的物侧包含一个限位面，当镜头组的物侧有保护玻璃17时，保护玻璃17的物方表面为限位面；当镜头组的物侧没有保护玻璃17时，由成像模组的外壳或与成像模组配合的其他机械结构的端面为限位面。近焦物面位于限位面±50 μm范围内，远焦物面与限位面的距离≥220 μm。
在本实施例中，调焦马达12的行程≥300 μm且≤600 μm，并且当调焦马达12带动第一透镜组10移动时，调焦距离与调焦马达12的行程相同。在调焦范围内，第一透镜组10和第二透镜组11的最小距离≥50 μm。当有保护玻璃17时，在调焦范围内，第一透镜组10和保护玻璃17的最小距离≥50 μm。
采用上述参数具有以下有益效果：
1）近焦物面能够覆盖保护玻璃17的近距离区域，可对贴近的物体进行成像，同时远焦物面能够超越显微镜常用的盖玻片，满足于生物医学成像的需求；
2）调焦马达12行程能够有效覆盖模组内各组件由于加工和安装导致的尺寸公差，提升了量产的可制造性；
3）第一透镜组10与保护玻璃17和第二透镜组11之间均保留了最小间隙，提升了本成像模组的可靠性，避免由于调焦马达12超过额定行程时模组内部件相互撞击从而损坏；
4）在实现上述有益效果的同时，实现了模组的小型化。
当调焦马达12带动第一透镜组10移动时，第二透镜组11位置固定。此时的近焦物面为第一透镜组10与第二透镜组11距离最小时，镜头组所对焦的物面；
调焦马达12带动第二透镜组11移动时，第一透镜组10位置固定。此时的近焦物面为第一透镜组10与第二透镜组11距离最小时，镜头组所对焦的物面。
其中，第一透镜组10和第二透镜组11组成的镜头组的物面至像面于光轴上的距离为TTL，镜头组的物侧表面至像侧表面于光轴上的距离为TD，其满足如下关系：0.15≤TD/TTL≤0.9；
第一透镜组10的焦距f 1和第二透镜组11的焦距f 2之间满足如下关系：0.1≤f 1/f 2≤10；
镜头组的光学筒长满足如下关系：0.2≤TTL/( f 1+f 2)≤15；
第一透镜组10的物方主平面至物面的距离L Obj满足如下关系：0.5f 1≤L Obj≤1.5f 1；
第二透镜组11的像方主平面到像面的距离L Ima满足如下关系式：0.5f 2≤L Ima≤1.5f 2。
调焦马达12带动第一透镜组10或第二透镜组11移动时，在整个调焦行程内，该成像模组均满足上述条件。
在一些实施例中，调焦马达12可以是音圈马达、超声马达、步进马达、记忆合金马达等。
在一些实施例中，该小型化的高成像质量的近距离成像模组还包括设于感光芯片15前方的滤光片18，用于将不需要的波段的光线滤除，以免影响成像效果。
通过实施本发明，具有以下有益效果：
1）该小型化的高成像质量的近距离成像模组的结构无需通过增大像距来实现近距离成像，所以整个模组体积可以做到小型化；
2）整个镜头组分为两个部分，第一透镜组和第二透镜组。与常见的整个镜头调焦方式不同，本发明中调焦马达只带动其中一个透镜组进行调焦，可以有效减小马达负载。并且当调焦马达带动第一透镜组移动时，调焦距离与调焦马达的行程相同，不会出现调焦距离小于马达行程的情形，避免了马达行程的浪费。
为使本发明的上述目的、特征和优越性能够更加明显易懂，下面结合具体实施方案对本发明作进一步详细的说明，所描述的实施例仅仅是本发明的一部分实施例，并非限定于本发明的保护范围。
第一实施例，如图1和2所示，提供了小型化的高成像质量的近距离成像模组，按照光路设置，包括从物方至像方依次设置的第一透镜组10、第二透镜组11和感光芯片15、以及用于带动第一透镜组10移动以实现调焦的调焦马达12。
其中，第一透镜组10和第二透镜组11组成镜头组，第一透镜组10的焦距f 1=2.2 mm，第二透镜组11 的焦距f 2=3 mm。镜头组的物面至像面于光轴上的距离TTL为8 mm，其物侧表面至像侧表面于光轴上的距离TD为6 mm。                    
第一透镜组10 通过点胶或者其他固定方式安装在调焦马达12的活动载体（图中未示出）上。调焦马达12可以是音圈马达、超声波马达、记忆合金马达等，调焦马达12的行程为300μm。
在本实施例中，还包括用于固定第二透镜组11的镜筒13，镜筒13有内螺纹，第二透镜组11有外螺纹，二者通过螺纹连接。实际成像时，调焦马达12带动第一透镜组10移动以实现调焦的功能，而第二透镜组11 在成像光路中的位置是固定的。
在本实施例中，感光芯片15设置于电路板16上，电路板16包括但不局限于印刷电路板、柔性电路板等。感光芯片15固定放置于第二透镜组11的像方焦面处，经过第二透镜组11汇聚的光线入射至感光芯片15上，感光芯片15对感应到的光线进行光电转换。
在一些实施例中，感光芯片15为面阵型光电器件。优选地，感光芯片15为CMOS图像传感器或CCD图像传感器。
此外，该小型化的高成像质量的近距离成像模组还包括外壳14，用于固定第一透镜组10、第二透镜组11、调焦马达12、感光芯片16等。
在本实施例中，如图1所示，近焦物面21位于外壳14的上表面的内侧50μm处。如图2所示，远焦物面22位于外壳14的上表面的外侧300μm处。在近焦情形下，第一透镜组10到外壳14的上表面的距离为900μm，第一透镜组10和第二透镜组11的距离为0.15 mm。在远焦情形下，第一透镜组10到外壳14的上表面的距离为550μm。
第二实施例，如图3和4所示，与第一实施例相比，在感光芯片15前方增加了滤光片18，在成像模组最前方增设了保护玻璃17，调焦方式为调焦马达12带动第二透镜组11运动，第一透镜组10固定在镜筒13上，镜筒13有内螺纹，第一透镜组10有外螺纹，二者通过螺纹连接。实际成像时，调焦马达12带动第二透镜组11移动以实现调焦的功能，而第一透镜组10 在成像光路中的位置是固定的。
其中，第一透镜组10 和第二透镜组11组成镜头组，第一透镜组10的焦距f 1=2.5 mm，第二透镜组11 的焦距f 2=5 mm。镜头组的物面至像面于光轴上的距离TTL为10 mm，其物侧表面至像侧表面于光轴上的距离TD为7 mm。
滤光片18设置于第二透镜组11和感光芯片15之间，可以通过胶水或者其他方式的固定在外壳14上，也可以直接与第二透镜组11像侧面胶合，还可以紧贴置于感光芯片15上方。滤光片18用于滤除不希望被感光芯片探测到的光，在一些实施例中，可以是反射式滤光片也可以是吸收式滤光片。
保护玻璃17安装在第一透镜组10之前，厚度为0.5mm，起到保护镜头的作用。为避免模组跌落时保护玻璃与地面硬接触，进而损坏内部马达机构和镜头等器件，一种优选地方案是在保护玻璃17与调焦马达12间加一层缓冲材料，包括但不限于泡沫塑料等材料。
需要说明的是，滤光片18和保护玻璃17可根据使用者实际需求选择，两者是否使用并不影响模组的核心成像功能。例如，在成像模组前方添加保护玻璃17时，成像模组最近的成像面至少要从保护玻璃17外表面开始，以保证在整个调焦范围内，物面均在保护玻璃17以外。同样，在添加滤光片18时，也应保证像方有足够空间在不影响成像的情况下合理设置滤光片18的位置。
如图3所示，本实施例的近焦物面21位于保护玻璃17的上表面之上。如图4所示，远焦物面位于保护玻璃17的上表面的外侧约200μm处。在近焦情形下，第一透镜组10和第二透镜组11的距离为0.4 mm。在远焦情形下，第一透镜组10和第二透镜组11的距离为0.05 mm。
 工业实用性
本发明是通过具体实施例进行说明的，本领域技术人员应当明白，在不脱离本发明范围的情况下，还可以对本发明进行各种变换和等同替代。另外，针对特定情形或具体情况，可以对本发明做各种修改，而不脱离本发明的范围。因此，本发明不局限于所公开的具体实施例，而应当包括落入本发明权利要求范围内的全部实施方式。

Claims (10)

  1. 一种小型化的高成像质量的近距离成像模组，其特征在于，包括从物方至像方依次设置的第一透镜组（10）、第二透镜组（11）和感光芯片（15）；以及，用于只带动所述第一透镜组（10）或所述第二透镜组（11）移动以实现调焦的调焦马达（12）；
    其中，所述第一透镜组（10）和第二透镜组（11）组成镜头组，所述镜头组的物面至像面于光轴上的距离为TTL，所述镜头组的物侧表面至像侧表面于光轴上的距离为TD，其满足如下关系：0.15≤TD/TTL≤0.9；
    所述第一透镜组（10）的焦距f 1和所述第二透镜组（11）的焦距f 2之间满足如下关系：0.1≤f 1/f 2≤10；
    所述镜头组的光学筒长满足如下关系：0.2≤
    Figure dest_path_image002
    ≤15；
    所述第一透镜组（10）的物方主平面至所述物面的距离L Obj满足如下关系：0.5f 1≤L Obj≤1.5f 1；
    所述第二透镜组（11）的像方主平面到所述像面的距离L Ima满足如下关系式：0.5f 2≤L Ima≤1.5f 2。
  2. 根据权利要求1所述的小型化的高成像质量的近距离成像模组，其特征在于，所述第一透镜组（10）和所述第二透镜组（11）均为正光焦度，分别至少包括三片透镜。
  3. 根据权利要求1所述的小型化的高成像质量的近距离成像模组，其特征在于，距离所述成像模组最近的物面为近焦物面，距离所述成像模组最远的物面为远焦物面，所述镜头组的物侧包含一个限位面，以远离所述成像模组的方向为正方向；
    所述近焦物面位于所述限位面±50 μm范围内，所述远焦物面与所述限位面的距离≥220 μm。
  4. 根据权利要求3所述的小型化的高成像质量的近距离成像模组，其特征在于，
    所述调焦马达（12）带动所述第一透镜组（10）移动时，所述第二透镜组（11）位置固定；此时的所述近焦物面为所述第一透镜组（10）与所述第二透镜组（11）距离最小时，所述镜头组所对焦的物面；
    所述调焦马达（12）带动所述第二透镜组（11）移动时，所述第一透镜组（10）位置固定；此时的所述近焦物面为所述第一透镜组（10）与所述第二透镜组（11）距离最小时，所述镜头组所对焦的物面。
  5. 根据权利要求1所述的小型化的高成像质量的近距离成像模组，其特征在于，所述调焦马达（12）的行程≥300 μm且≤600 μm。
  6. 根据权利要求5所述的小型化的高成像质量的近距离成像模组，其特征在于，当调焦马达（12）带动所述第一透镜组（11）移动时，调焦距离与所述调焦马达（12）的行程相同。
  7. 根据权利要求1所述的小型化的高成像质量的近距离成像模组，其特征在于，在调焦范围内，所述第一透镜组（10）和所述第二透镜组（11）的最小距离≥50 μm。
  8. 根据权利要求1所述的小型化的高成像质量的近距离成像模组，其特征在于，还包括设于所述感光芯片（15）前方的滤光片（18），用于将不需要的波段的光线滤除。
  9. 根据权利要求1所述的小型化的高成像质量的近距离成像模组，其特征在于，还包括设于所述镜头组前方的保护玻璃（17），所述保护玻璃（17）的物方表面为限位面。
  10. 根据权利要求9所述的小型化的高成像质量的近距离成像模组，其特征在于，在调焦范围内，所述第一透镜组（10）和所述保护玻璃（17）的最小距离≥50 μm。
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130265648A1 (en) * 2012-04-06 2013-10-10 Pentax Ricoh Imaging Company, Ltd. Macro lens system
CN106556920A (zh) * 2015-09-28 2017-04-05 富士胶片株式会社 摄像透镜以及摄像装置
CN107102427A (zh) * 2016-02-19 2017-08-29 富士胶片株式会社 成像透镜及摄像装置
CN110351405A (zh) * 2019-07-03 2019-10-18 肯维捷斯（武汉）科技有限公司 一种具有微观成像功能的移动通讯设备
CN110351470A (zh) * 2019-07-31 2019-10-18 肯维捷斯（武汉）科技有限公司 一种摄像头模组
CN110716292A (zh) * 2019-11-15 2020-01-21 杭州图谱光电科技有限公司 一种大靶面半组移动工业微距镜头

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130265648A1 (en) * 2012-04-06 2013-10-10 Pentax Ricoh Imaging Company, Ltd. Macro lens system
CN106556920A (zh) * 2015-09-28 2017-04-05 富士胶片株式会社 摄像透镜以及摄像装置
CN107102427A (zh) * 2016-02-19 2017-08-29 富士胶片株式会社 成像透镜及摄像装置
CN110351405A (zh) * 2019-07-03 2019-10-18 肯维捷斯（武汉）科技有限公司 一种具有微观成像功能的移动通讯设备
CN110351470A (zh) * 2019-07-31 2019-10-18 肯维捷斯（武汉）科技有限公司 一种摄像头模组
CN110716292A (zh) * 2019-11-15 2020-01-21 杭州图谱光电科技有限公司 一种大靶面半组移动工业微距镜头

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