WO2020215197A1 - 一种适配镜定焦镜头 - Google Patents

一种适配镜定焦镜头 Download PDF

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WO2020215197A1
WO2020215197A1 PCT/CN2019/083793 CN2019083793W WO2020215197A1 WO 2020215197 A1 WO2020215197 A1 WO 2020215197A1 CN 2019083793 W CN2019083793 W CN 2019083793W WO 2020215197 A1 WO2020215197 A1 WO 2020215197A1
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lens
fixed
focus lens
group
adapter
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PCT/CN2019/083793
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English (en)
French (fr)
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迟崇巍
田捷
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北京数字精准医疗科技有限公司
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Priority to PCT/CN2019/083793 priority Critical patent/WO2020215197A1/zh
Publication of WO2020215197A1 publication Critical patent/WO2020215197A1/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
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation

Definitions

  • the present invention relates to the technical field of medical devices, in particular, to an adapter lens fixed focus lens.
  • An endoscope is a medical testing instrument. Doctors can use the endoscope to observe the ulcers or tumors in the patient's body and work out the best treatment plan accordingly.
  • near-infrared fluorescence imaging detection as an important detection method, has been increasingly used in scientific research and production.
  • the existing hard tube adapter lens fixed focus lens can no longer meet the needs of near-infrared fluorescence detection, and there is an urgent need for an adapter lens fixed focus lens suitable for a wide spectrum.
  • the purpose of this manual is to provide an adapter lens fixed-focus lens, which is suitable for wide-spectrum endoscopic systems and has high imaging quality.
  • An adapter lens fixed focus lens provided in this manual is realized by including the following methods:
  • An adapter lens fixed-focus lens includes a front cemented group, a convex lens, and a rear cemented group coaxially arranged from the object side to the image side, wherein:
  • the front cemented group has a negative refractive power and is formed by cementing a first biconcave negative lens and a first biconvex positive lens;
  • the convex lens has positive refractive power and is a double convex positive lens
  • the rear cemented group has a negative refractive power and is formed by cementing a second double convex positive lens and a second double concave negative lens.
  • the focal length of the front glued group is any value between -55mm and -45mm, and the focal length of the convex lens is any value between 19mm and 22mm,
  • the focal length of the post-gluing group is any value between -118mm and -105mm, and correspondingly, the focal length of the fixed focus lens is any value between 26mm and 30mm.
  • the lenses of the front cemented lens group, the convex lens, and the rear cemented lens group are coated with an antireflection coating with a spectral width of 400 nm to 1000 nm.
  • the fixed-focus lens further includes a front protection window and a rear protection window. Both the front protection window and the rear protection window have no optical power, and are double-sided uniform. It is a flat lens.
  • the fixed focus lens is provided with a front protective window, a front cemented group, a convex lens, a rear cemented group and a rear protective window arranged coaxially from the object side to the image side.
  • the front protective window and the rear protective window are coated with an anti-reflection film with a spectral width of 400 nm to 1000 nm and which can withstand disinfection treatment.
  • the entrance pupil diameter of the fixed focus lens is any value between 4 mm and 6 mm.
  • the total length of the optical system of the fixed focus lens is any value between 49 mm and 55 mm.
  • the field angle of the fixed focus lens includes 16°.
  • the adapter lens fixed focus lens provided in this manual adopts a coaxially arranged front cemented lens, convex lens, and rear cemented lens to form a fixed focus lens optical system, which is suitable for a wide spectrum endoscope system.
  • the above-mentioned structural design can make the adapter lens fixed-focus lens have the advantages of total optical length, small size, convenient installation and adjustment, and high imaging quality.
  • Fig. 1 is a schematic diagram of the optical system structure of a wide-spectrum adapter lens fixed-focus lens in an embodiment of this specification;
  • Figure 2 is a point diagram of a wide-spectrum adapter lens and a fixed-focus lens in another embodiment of this specification;
  • Fig. 3 is an optical transfer function diagram (cut-off resolution of 120lp/mm) when the focal length of the wide-spectrum adaptor fixed-focus lens is 180mm in another embodiment of this specification;
  • An endoscope is a medical testing instrument. Doctors can use the endoscope to observe ulcers or tumors in the patient's body and formulate the best treatment plan accordingly.
  • near-infrared fluorescence imaging detection as an important detection method, has been increasingly used in scientific research and production.
  • the existing hard tube adapter lens fixed focus lens can no longer meet the needs of near-infrared fluorescence detection, and a wide spectrum adapter lens fixed focus lens is urgently needed.
  • the fixed focus lens may include a coaxially arranged front cemented group, convex lens, and rear cemented group in sequence from the object side to the image side, wherein,
  • the front cemented group has negative refractive power, and may be formed by cementing a first biconcave negative lens and a first biconvex positive lens;
  • the convex lens has positive refractive power, and may be a double convex positive lens
  • the rear cemented group has a negative refractive power, and may be cemented by a second double convex positive lens and a second double concave negative lens.
  • Figure 1 is a schematic diagram of the structure of an adapter lens fixed focus lens in an embodiment of this specification.
  • the adapter lens fixed focus lens provided in this specification is provided with a front cemented group, a convex lens and a rear lens in sequence from the object side to the image side. Gluing group.
  • the front glue group may have a negative optical power.
  • the front cemented group may be formed by cementing the first biconcave negative lens L1 and the first biconvex positive lens L2.
  • a convex lens L3 may be provided behind the front cementing group, and the convex lens has positive refractive power.
  • the convex lens may be a double convex positive lens.
  • the post-gluing group may have a negative power.
  • the rear cemented group may be formed by cementing the second biconvex positive lens L4 and the second biconcave negative lens L5.
  • first double-concave negative lens the first double-convex positive lens, the second double-convex positive lens, and the second double-concave negative lens are only defined for the purpose of distinguishing expressions.
  • the same type The lens parameters can be the same or different, which is not limited here.
  • the embodiment of this specification adopts the structure of double cemented lens, which can effectively balance the chromatic aberration during the propagation of broad-spectrum light, realize the chromatic aberration correction on and off the optical axis, and can also effectively correct the chromatic aberration on and off the optical axis. Aberration. This can further improve the effect of chromatic aberration and aberration correction during the propagation of broad-spectrum light.
  • two cemented doublet lens groups with negative refractive power are used coaxially arranged in the front and rear, and a double-convex positive lens with positive refractive power is arranged in the two cemented doublet lens groups with negative refractive power.
  • Adopting the above-mentioned structural design can not only improve the optical imaging quality, but also make the fixed-focus lens have the advantages of simple structure and convenient assembly and adjustment.
  • the lenses of the front cemented lens group, the convex lens and the rear cemented lens group may all be coated with an antireflection coating with a spectral width of 400nm to 1000nm, so as to improve the optical system's transmission of light in the broad spectrum. Overrate.
  • the fixed focus lens may further include a front protection window 102 and a rear protection window 104.
  • Both the front protection window and the rear protection window have no optical power, and are lenses with flat surfaces on both sides.
  • the fixed focus lens is sequentially provided with a front protection window, a front glue group, a convex lens, a rear glue group and a rear protection window arranged coaxially from the object side to the image side.
  • Both the front protection window and the rear protection window can be coated with an antireflection film with a spectral width of 400 nm to 900 nm and which can withstand disinfection treatment. Thereby, it can play the role of waterproof and dustproof, facilitate disinfection and cleaning, and will not affect the imaging effect of the fixed focus lens.
  • the image formed by the object side through the optical system of the endoscope is further coupled into the rear wide-spectrum detector through the adapter lens fixed focus lens provided in the embodiment of this specification, and finally the light The signal is converted into an electrical signal and sent to the monitor connected to it for display.
  • the fixed-focus lens provided by the above-mentioned embodiments of this specification also has the advantages of total optical length, small size, etc., and thus is more suitable for endoscopic imaging systems.
  • the focal length of the front cementing group can be any value between -55mm and -45mm
  • the focal length of the convex lens can be any value between 19mm and 22mm
  • the back The focal length of the glued group can be any value between -118mm and -105mm.
  • the focal length of the fixed focus lens can be any value between 26 mm and 30 mm.
  • the focal length of the front cemented group may be -51.3mm
  • the focal length of the convex lens may be 20.8mm
  • the focal length of the rear cemented group may be -111.6mm
  • the focal length of the fixed focus lens may be 28mm.
  • the total length of the optical system of the fixed focus lens may be any value between 49 mm and 55 mm.
  • the total length of the optical system of the fixed focus lens may be 52 mm.
  • the entrance pupil diameter of the fixed focus lens may be any value between 4 mm and 6 mm.
  • the entrance pupil diameter of the fixed focus lens may be 5 mm.
  • the field angle of the fixed focus lens may be 16°, and the maximum aperture may be 12 mm.
  • Table 1 is a structural parameter table of the fixed-focus lens optical system provided in one or more embodiments of this specification.
  • the given value of the above parameter is only a priority value, which includes but is not limited to the above given parameter value in specific implementation.
  • Figures 2 to 4 are aberration analysis diagrams of a specific embodiment of a wide-spectrum adapter lens fixed focus lens described in Figure 1, Figure 2 is a point diagram, and Figure 3 is a Modulation Transfer Function (MTF) ) Figure and Figure 4 are field curvature distortion diagrams.
  • MTF Modulation Transfer Function
  • Fig. 2 is a spot diagram (SPOT DIAGRAM) of the endoscope optical system provided by the embodiment of this specification. It can be seen from Figure 2 that the Airy radius (AIRY RADIUS) is 4.012 ⁇ m. Figure 2 shows five field of view (FIELD) points from the on-axis field of view to the off-axis field of view. 0.000MM (1), 1.000MM (2), 2.000MM (3), 2.999MM (4), 3.999MM In the image point map of (5), the geometric radii (GEO RADIUS) of the corresponding image points are all corrected to the order of Airy disk radius, and the system imaging quality is good. Among them, RMS RADIUS is the root mean square radius of the image point. IMR is the image plane.
  • the transfer function curve is shown in Figure 3, where the ordinate is the contrast ( MOULUS OF THE OTF), the abscissa spatial frequency is (SPATIAL FREQUENCY IN CYCLES), and the corresponding wavelength range is 0.4861-1um. It can be seen from Figure 3 that the MTF is close to the diffraction limit, and the average MTF of the full field of view is >0.4@120lp/mm, which is a high index.
  • Fig. 4 is a field curvature and distortion curve diagram of an endoscope optical system provided by an embodiment of this specification.
  • the left side diagram in Fig. 4 shows a field curve (FIELD CURVATURE) diagram at different wavelengths, and the unit of abscissa is millimeter ( MILLIMETERS); the right graph in Figure 4 shows the DISTORTION curve at different wavelengths, and the unit of abscissa is PERCENT.
  • the corresponding wavelengths are: 0.486um, 0.500um, 0656um, 0.800um, 1.000um, respectively.
  • the distortion of the system is less than 1%, and there is basically no difference in the system distortion curve corresponding to different wavelengths.
  • the system corresponds to the same field curvature in the meridian and sagittal directions at different wavelengths. Distortion and field curvature curve prove that the imaging quality of the system is better.
  • the above-mentioned fixed focus lens provided by the embodiment of this specification has the advantages of total optical length, small size, easy sterilization, convenient assembly and adjustment, and high imaging quality. It is suitable for detectors of 1/1.8 inch and below. It can be connected to a hard tube endoscope and a camera system. It can be used for imaging in various bands in the wide spectral range of 400nm-1000nm, which can meet the requirements of scientific researchers and medical personnel.

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  • General Physics & Mathematics (AREA)
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Abstract

一种适配镜定焦镜头，定焦镜头由物方到像方依次包括同轴排列的前胶合组、凸透镜（L3）以及后胶合组，其中，所述前胶合组具有负光焦度，由第一双凹形负透镜（L1）与第一双凸形正透镜（L2）胶合而成；所述凸透镜（L3）具有正光焦度，为双凸形正透镜；所述后胶合组具有负光焦度，由第二双凸形正透镜（L4）和第二双凹形负透镜（L5）胶合而成。

Description

一种适配镜定焦镜头 技术领域
本发明涉及医疗器械技术领域，特别地，涉及一种适配镜定焦镜头。
背景技术
内窥镜是一种医用检测仪器，医生可以借助内窥镜观察患者体内的溃疡或肿瘤，据此制定出最佳的治疗方案。随着近红外技术的日趋成熟，近红外荧光成像检测作为一种重要的检测手段，已经越来越多的应用于科研与生产中。现有硬管适配镜定焦镜头已经不能满足近红外荧光检测的需求，亟需一种适应于宽光谱的适配镜定焦镜头。
发明内容
本说明书目的在于提供一种适配镜定焦镜头，适用于宽光谱内窥镜系统，且成像质量高。
本说明书提供的一种适配镜定焦镜头是通过包括以下方式实现的：
一种适配镜定焦镜头，所述定焦镜头由物方到像方依次包括同轴排列的前胶合组、凸透镜以及后胶合组，其中，
所述前胶合组具有负光焦度，由第一双凹形负透镜与第一双凸形正透镜胶合而成；
所述凸透镜具有正光焦度，为双凸形正透镜；
所述后胶合组具有负光焦度，由第二双凸形正透镜和第二双凹形负透镜胶合而成。
本说明书提供的所述定焦镜头的另一个实施例中，所述前胶合组的焦距为-55mm～-45mm之间的任意值，所述凸透镜的焦距为19mm～22mm之间的任意值，所述后胶合组的焦距为-118mm～-105mm之间的任意值，相应的，所述定焦镜头的焦距为26mm～30mm之间的任意值。
本说明书提供的所述定焦镜头的另一个实施例中，所述前胶合组、凸透镜以及后胶合组的镜片上镀有光谱宽度为400nm～1000nm的增透膜。
本说明书提供的所述定焦镜头的另一个实施例中，所述定焦镜头还包括前保护窗及后保护窗，所述前保护窗、后保护窗均无光焦度，为双面均为平面的透镜，相应的，所述定焦镜头由物方到像方依次设置有同轴排列的前保护窗、前胶合组、凸透镜、后胶合组以及后保护窗。
本说明书提供的所述定焦镜头的另一个实施例中，所述前保护窗、后保护窗镀有光谱宽 度为400nm～1000nm且可经受消毒处理的增透膜。
本说明书提供的所述定焦镜头的另一个实施例中，所述定焦镜头的入瞳直径为4mm～6mm之间的任意值。
本说明书提供的所述定焦镜头的另一个实施例中，所述定焦镜头的光学系统总长为49mm～55mm之间的任意值。
本说明书提供的所述定焦镜头的另一个实施例中，所述定焦镜头的视场角包括16°。
本说明书提供的适配镜定焦镜头，通过采用同轴排列的前胶合组、凸透镜以及后胶合组组成定焦镜头的光学系统，以适用于宽光谱内窥镜系统。且采用上述结构设计，可以使得适配镜定焦镜头具备光学总长短，体积小，装调方便，成像质量高等优点。
附图说明
为了更清楚地说明本说明书实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本说明书中记载的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是本说明书一个实施例中的宽光谱适配镜定焦镜头光学系统结构示意图；
图2是本说明书另一个实施例中的宽光谱适配镜定焦镜头的点列图；
图3是本说明书另一个实施例中的宽光谱适配镜定焦镜头的焦距为180mm时的光学传递函数图(截止分辨率为120lp/mm)；
图4是本说明书另一个实施例中的宽光谱适配镜定焦镜头的象散畸变图；
其中，100-物空间，101-光阑，102-前保护窗口，103-透镜组，104-后保护窗口，105-滤光片，106-探测器保护窗口，107-像面，L1-第一双凹形负透镜，L2-第一双凸形正透镜，L3-凸透镜，L4-第二双凸形正透镜，L5-第二双凹形负透镜，S1-S8为透镜各个表面。
具体实施方式
为了使本技术领域的人员更好地理解本说明书中的技术方案，下面将结合本说明书实施例中的附图，对本说明书实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本说明书一部分实施例，而不是全部的实施例。基于本说明书中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都应当属于本说明书保护的范围。
内窥镜是一种医用检测仪器，医生可以借助内窥镜观察患者体内的溃疡或肿瘤，据此制 定出最佳的治疗方案。随着近红外技术的日趋成熟，近红外荧光成像检测作为一种重要的检测手段，已经越来越多的应用于科研与生产中。现有硬管适配镜定焦镜头已经不能满足近红外荧光检测的需求，亟需一种宽光谱适配镜定焦镜头。
相应的，本说明书提供了一种适配镜定焦镜头，所述定焦镜头由物方到像方可以依次包括同轴排列的前胶合组、凸透镜以及后胶合组，其中，
所述前胶合组具有负光焦度，可以由第一双凹形负透镜与第一双凸形正透镜胶合而成；
所述凸透镜具有正光焦度，可以为双凸形正透镜；
所述后胶合组具有负光焦度，可以由第二双凸形正透镜和第二双凹形负透镜胶合而成。
图1是本说明书一个实施例中适配镜定焦镜头结构示意图，如图1所示，本说明书提供的适配镜定焦镜头从物方至像方依次设置有前胶合组、凸透镜以及后胶合组。
本说明书一个实施例中，所述前胶合组可以具有负光焦度。一些实施方式中，所述前胶合组可以由第一双凹形负透镜L1与第一双凸形正透镜L2胶合而成。所述前胶合组的后方可以设置有凸透镜L3，所述凸透镜具有正光焦度。一些实施方式中，所述凸透镜可以为双凸形正透镜。所述后胶合组可以具有负光焦度。一些实施方式中，所述后胶合组可以由第二双凸形正透镜L4和第二双凹形负透镜L5胶合而成。
需说明的是，所述第一双凹形负透镜、第一双凸形正透镜、第二双凸形正透镜、第二双凹形负透镜仅仅是为了区分表述而进行的定义，同类型的透镜参数可以相同，也可以不同，这里不做限定。
本说明书实施例通过采用双胶合透镜的结构，可以有效平衡宽光谱光线传播过程中的色差，实现对光轴上及光轴外的色差校正，同时还可以有效校正光轴上及光轴外的像差。从而可以进一步提高对宽光谱光线传播过程中的色差以及像差校正效果。
进一步，利用前后两个同轴排列的具有负光焦度的双胶合透镜组，并在两个负光焦度的双胶合透镜组设置一具有正光焦度的双凸形正透镜的结构形式。采用上述结构设计，在提高光学成像质量的同时，还可以使得定焦镜头整体具备结构简单，装调方便等优点。
本说明书的一个实施例中，所述前胶合组、凸透镜以及后胶合组的镜片上均可以镀有光谱宽度为400nm～1000nm的增透膜，以提高光学系统对该宽光谱段内光的透过率。
本说明书的一个实施例中，所述定焦镜头还可以包括前保护窗102及后保护窗104，所述前保护窗、后保护窗均无光焦度，为双面均为平面的透镜，相应的，所述定焦镜头由物方到像方依次设置有同轴排列的前保护窗、前胶合组、凸透镜、后胶合组以及后保护窗。所述前保护窗、后保护窗上均可以镀有光谱宽度为400nm～900nm且可经受消毒处理的增透膜。从而可以起到防水和防尘的作用，有利于消毒清洗，且不会影响定焦镜头的成像效果。
具体实施时，物方通过内窥镜的光学系统所成的像，进一步经本说明书实施例提供的适配镜定焦镜头，耦合进后方的宽光谱探测器，最终由宽光谱探测器将光信号转换成电信号，发送给与之连接的显示器，以进行显示。
在保证宽光谱成像质量的前提下，本说明书上述实施例提供的定焦镜头，还具备光学总长短、体积小等优点，从而更加适用于内窥镜成像系统。本说明书的一个或者多个实施例中，所述前胶合组的焦距可以为-55mm～-45mm之间的任意值，所述凸透镜的焦距可以为19mm～22mm之间的任意值，所述后胶合组的焦距可以为-118mm～-105mm之间的任意值。相应的，所述定焦镜头的焦距可以为26mm～30mm之间的任意值。优选的，所述前胶合组的焦距可以为-51.3mm，所述凸透镜的焦距可以为20.8mm，所述后胶合组的焦距可以为-111.6mm，所述定焦镜头的焦距可以为28mm。
本说明书的一个实施例中，所述定焦镜头的光学系统总长可以为49mm～55mm之间的任意值。优选的，所述定焦镜头的光学系统总长可以为52mm。
本说明书的一个实施例中，所述定焦镜头的入瞳直径可以为4mm～6mm之间的任意值。优选的，所述定焦镜头的入瞳直径可以为5mm。
本说明书的一个或者多个实施例中，所述定焦镜头的视场角可以采用16°，最大口径可以采用12mm。表1为本说明书一个或者多个实施例中提供的定焦镜头光学系统结构参数表。
表1定焦镜头光学系统的结构参数数据表
表面 曲率半径 厚度(间隔) 材料 口径
S1 -8 1 H-ZF4 9
S2 85.7 3 H-ZPK1A 11
S3 -15.2 .1   11
S4 230.7 3 ZF52 12
S5 -18.7 2   12
S6 22.6 3 H-ZPK1A 11
S7 -16.96 1 H-ZF4 11
S8 -22 22.43   9
需要说明的是，上述参数给定的值仅仅为优先值，具体实施时包括但不限于上述给定的参数值。
图2-图4是图1所述的一种宽光谱适配镜定焦镜头的具体实施例的像差分析图，图2是点列图、图3是MTF(Modulation Transfer Function，调制传递函数)图、图4是场曲畸变图。
图2为本说明书实施例提供的内窥镜光学系统的点列图(SPOT DIAGRAM)。从图2可以看到，艾里斑半径(AIRY RADIUS)为4.012μm。图2中给出了从轴上视场至轴外视场五个视场(FIELD)点0.000MM(1)、1.000MM(2)、2.000MM(3)、2.999MM(4)、3.999MM(5)的像点图，所对应的像点的几何半径(GEO RADIUS)均校正到了艾里斑半径的数量等级，系统成像质量较好，其中，RMS RADIUS为像点的均方根半径，IMR为像面。
经优化后，内窥镜光学系统的像差较小，成像质量提升，系统中所有视场均具有较高的分辨率，其传递函数曲线图如图3所示，其中，纵坐标为对比度(MOULUS OF THE OTF)，横坐标空间频率为(SPATIAL FREQUENCY IN CYCLES)，相应的波长范围为0.4861-1um。从图3中可以看出，MTF接近衍射极限，全视场的平均MTF>0.4@120lp/mm，指标较高。
图4为本说明书实施例提供的内窥镜光学系统的场曲和畸变曲线图，其中，图4中的左侧图表示不同波长下的场曲(FIELD CURVATURE)图，横坐标单位为毫米(MILLIMETERS)；图4中的右侧图表示不同波长下的畸变(DISTORTION)曲线图，横坐标单位为百分比(PERCENT)。相应的波长分别为：0.486um，0.500um，0656um，0.800um，1.000um、。从图4可以看出，系统的畸变<1％，且对应不同波长下的系统畸变曲线基本无差别。系统对应不同波长下的子午和弧矢方向的场曲较为一致。畸变及场曲曲线证明系统成像质量较好。
由此可见，各种像差得到了很好的校正，弥散斑均校正到接近艾利班大小，MTF接近衍射极限，所述定焦镜头的全视场的平均MTF>0.4@120lp/mm，畸变<1％。
本说明书实施例提供的上述定焦镜头，具备光学总长短，体积小，便于消毒，装调方便，成像质量高等优点。适用于1/1.8英寸及以下的探测器，可以连接硬管内窥镜与摄像系统，应用于400nm-1000nm宽光谱范围内各波段的成像，可以满足科研人员和医务人员的要求。
本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处。在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本说明书的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。本说明书附图仅仅只是示意图，不代表各个部件的实际结构。
以上所述仅为本说明书一个或多个实施例的实施例而已，并不用于限制本本说明书一个或多个实施例。对于本领域技术人员来说，本说明书一个或多个实施例可以有各种更改和变化。凡在本说明书的精神和原理之内所作的任何修改、等同替换、改进等，均应包含在权利要求范围之内。

Claims (8)

  1. 一种适配镜定焦镜头，其特征在于，所述定焦镜头由物方到像方依次包括同轴排列的前胶合组、凸透镜以及后胶合组，其中，
    所述前胶合组具有负光焦度，由第一双凹形负透镜与第一双凸形正透镜胶合而成；
    所述凸透镜具有正光焦度，为双凸形正透镜；
    所述后胶合组具有负光焦度，由第二双凸形正透镜和第二双凹形负透镜胶合而成。
  2. 根据权利要求1所述的适配镜定焦镜头，其特征在于，所述前胶合组的焦距为-55mm～-45mm之间的任意值，所述凸透镜的焦距为19mm～22mm之间的任意值，所述后胶合组的焦距为-118mm～-105mm之间的任意值，相应的，所述定焦镜头的焦距为26mm～30mm之间的任意值。
  3. 根据权利要求1或2所述的适配镜定焦镜头，其特征在于，所述前胶合组、凸透镜以及后胶合组的镜片上镀有光谱宽度为400nm～1000nm的增透膜。
  4. 根据权利要求1所述的适配镜定焦镜头，其特征在于，所述定焦镜头还包括前保护窗及后保护窗，所述前保护窗、后保护窗均无光焦度，为双面均为平面的透镜，相应的，所述定焦镜头由物方到像方依次设置有同轴排列的前保护窗、前胶合组、凸透镜、后胶合组以及后保护窗。
  5. 根据权利要求4所述的适配镜定焦镜头，其特征在于，所述前保护窗、后保护窗镀有光谱宽度为400nm～1000nm且可经受消毒处理的增透膜。
  6. 根据权利要求1所述的适配镜定焦镜头，其特征在于，所述定焦镜头的入瞳直径为4mm～6mm之间的任意值。
  7. 根据权利要求1所述的适配镜定焦镜头，其特征在于，所述定焦镜头的光学系统总长为49mm～55mm之间的任意值。
  8. 根据权利要求1所述的适配镜定焦镜头，其特征在于，所述定焦镜头的视场角包括16°。
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Publication number Priority date Publication date Assignee Title
US7639433B1 (en) * 2008-09-03 2009-12-29 Young Optics Inc. Fixed-focus lens
CN202600240U (zh) * 2012-06-07 2012-12-12 北京天诚盛业科技有限公司 一种虹膜图像采集定焦镜头
CN203350522U (zh) * 2013-06-28 2013-12-18 东莞市宇瞳光学科技有限公司 16mm大孔径日夜两用定焦镜头
CN107797259A (zh) * 2017-11-30 2018-03-13 福建福光股份有限公司 一种5.2mm超清4K定焦镜头

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7639433B1 (en) * 2008-09-03 2009-12-29 Young Optics Inc. Fixed-focus lens
CN202600240U (zh) * 2012-06-07 2012-12-12 北京天诚盛业科技有限公司 一种虹膜图像采集定焦镜头
CN203350522U (zh) * 2013-06-28 2013-12-18 东莞市宇瞳光学科技有限公司 16mm大孔径日夜两用定焦镜头
CN107797259A (zh) * 2017-11-30 2018-03-13 福建福光股份有限公司 一种5.2mm超清4K定焦镜头

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