CN109654393B - Nostril illuminating device with second shielding plate - Google Patents

Nostril illuminating device with second shielding plate Download PDF

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CN109654393B
CN109654393B CN201910109296.3A CN201910109296A CN109654393B CN 109654393 B CN109654393 B CN 109654393B CN 201910109296 A CN201910109296 A CN 201910109296A CN 109654393 B CN109654393 B CN 109654393B
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shielding plate
pinhole
objective lens
optical axis
nostril
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CN109654393A (en
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赵烟桥
史领
韩玉翠
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Harbin University of Science and Technology
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21LLIGHTING DEVICES OR SYSTEMS THEREOF, BEING PORTABLE OR SPECIALLY ADAPTED FOR TRANSPORTATION
    • F21L2/00Systems of electric lighting devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/006Refractors for light sources applied to portable lighting devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design
    • F21V7/08Optical design with elliptical curvature

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)
  • Surgical Instruments (AREA)
  • Accommodation For Nursing Or Treatment Tables (AREA)

Abstract

本发明的具有第二遮挡板的鼻孔照明装置属于婴儿用品、儿科医疗器械和光学照明等领域;该照明装置在外壳内,沿光线传播方向依次同轴设置物镜、针孔、第一遮挡板、第二遮挡板和椭球面反射镜;所述物镜焦点位置和椭球面反射镜远焦点位置重合,重合处设置针孔;平行光束沿光轴方向照射物镜,在针孔位置形成点光源,再经过椭球面反射镜反射至近焦点位置,会聚成点光斑;所述第一遮挡板和第二遮挡板同轴设置,第一遮挡板为环形,第二遮挡板为圆形,第一遮挡板内圆直径大于第二遮挡板直径,第一遮挡板和第二遮挡板均能够在针孔和椭球面反射镜之间沿光轴方向移动;本发明婴儿用鼻孔照明装置,能够以非常简单的结构,提供高质量的会聚照明光束。

Figure 201910109296

The nostril illuminating device with the second shielding plate of the present invention belongs to the fields of baby products, pediatric medical equipment, optical lighting and the like; the illuminating device is arranged in the casing, and the objective lens, the pinhole, the first shielding plate, the first shielding plate, the objective lens, the pinhole, the first shielding plate, The second shielding plate and the ellipsoid reflector; the focal position of the objective lens coincides with the far focus position of the ellipsoid reflector, and a pinhole is arranged at the overlap; the parallel beam illuminates the objective lens along the optical axis, forming a point light source at the pinhole position, and then passes through the The ellipsoidal reflector reflects to the near-focus position and converges into a spot light spot; the first shielding plate and the second shielding plate are coaxially arranged, the first shielding plate is annular, the second shielding plate is circular, and the first shielding plate has an inner circle The diameter is larger than the diameter of the second shielding plate, and both the first shielding plate and the second shielding plate can move along the optical axis between the pinhole and the ellipsoid reflector; Provides high-quality convergent lighting beams.

Figure 201910109296

Description

具有第二遮挡板的鼻孔照明装置Nostril lighting device with second shutter

本申请是发明专利申请《婴儿用鼻孔照明装置》的分案申请。This application is a divisional application of the invention patent application "Nostril Lighting Device for Infants".

原案申请日:2017-01-11。The original application date: 2017-01-11.

原案申请号:2017100199593。The original application number: 2017100199593.

原案发明名称:婴儿用鼻孔照明装置。Name of the invention in the original case: Nostril lighting device for infants.

技术领域technical field

本发明第二遮挡板和具有第二遮挡板的鼻孔照明装置属于婴儿用品、儿科医疗器械和光学照明等领域。The second shielding plate and the nostril lighting device with the second shielding plate of the present invention belong to the fields of baby products, pediatric medical instruments, optical lighting and the like.

背景技术Background technique

鼻屎会阻碍呼吸,给人带来不舒服的感觉。成年人在鼻孔中有鼻屎的时候,能够自己将鼻屎抠出,然而,对于婴儿,由于肢体发育不全,无法自主挖鼻屎,因此需要家长的帮助。Booger can obstruct breathing and cause discomfort. When adults have boogers in their nostrils, they can pull out the boogers by themselves. However, for infants, due to underdeveloped limbs, they cannot dig the boogers on their own, so they need the help of parents.

但是,由于婴儿不懂得配合家长,因此会在挖鼻屎的时候进行本能反抗,容易造成鼻粘膜破损,给挖鼻屎工作的开展带来困难,解决这个问题的方法就是在婴儿熟睡后,再给婴儿挖鼻屎。However, because babies do not know how to cooperate with their parents, they will instinctively resist when picking boogers, which will easily cause damage to the nasal mucosa and bring difficulties to the development of booger picking. Pick up baby's booger.

由于鼻屎藏在鼻孔内部,因此需要对婴儿的鼻孔进行照明,这对照明光束的会聚特性有着很高的要求,原因如下:Since the boogers are hidden inside the nostrils, the baby's nostrils need to be illuminated, which has high requirements on the converging characteristics of the illumination beam for the following reasons:

第一、如果光束发散,会照射到婴儿眼睛,使婴儿从熟睡中清醒过来,造成挖鼻屎工作无法进行;First, if the light beam diverges, it will irradiate the baby's eyes, so that the baby wakes up from a deep sleep, making it impossible to pick the nose;

第二、婴儿的鼻孔很小,如果光束发散,可能造成照明强度不够,也会给挖鼻屎工作的开展带来困难。Second, the baby's nostrils are very small. If the beam is divergent, it may cause insufficient lighting intensity, which will also bring difficulties to the development of booger picking.

可见,一个具有良好会聚功能的照明装置,是顺利开展婴儿挖鼻屎工作的关键辅助设备。It can be seen that a lighting device with a good convergence function is a key auxiliary device for the smooth development of the baby's nose picking work.

然而,无论是日常照明灯、手电,光束都是发散的,无法实现会聚照明的作用。However, whether it is a daily lighting lamp or a flashlight, the light beam is divergent and cannot achieve the effect of convergent lighting.

发明内容SUMMARY OF THE INVENTION

针对开展婴儿挖鼻屎工作中对鼻孔照明的需求,本发明设计了一种婴儿用鼻孔照明装置,该装置能够以非常简单的结构,提供高质量的会聚照明光束。Aiming at the requirement for nostril lighting in the work of picking up babies' noses, the present invention designs a nostril lighting device for infants, which can provide high-quality convergent lighting beams with a very simple structure.

本发明的目的是这样实现的:The object of the present invention is achieved in this way:

婴儿用鼻孔照明装置,在外壳内,沿光线传播方向依次同轴设置物镜、针孔、第一遮挡板、第二遮挡板和椭球面反射镜;所述物镜焦点位置和椭球面反射镜远焦点位置重合,重合处设置针孔;平行光束沿光轴方向照射物镜,在针孔位置形成点光源,再经过椭球面反射镜反射至近焦点位置,会聚成点光斑;所述第一遮挡板和第二遮挡板同轴设置,第一遮挡板为环形,第二遮挡板为圆形,第一遮挡板内圆直径大于第二遮挡板直径,第一遮挡板和第二遮挡板均能够在针孔和椭球面反射镜之间沿光轴方向移动。In the nostril lighting device for infants, an objective lens, a pinhole, a first shielding plate, a second shielding plate and an ellipsoidal reflector are coaxially arranged in the outer shell in sequence along the light propagation direction; the focal position of the objective lens and the far focus of the ellipsoidal reflector The positions are coincident, and pinholes are arranged at the coincidence; the parallel beam illuminates the objective lens along the direction of the optical axis, and a point light source is formed at the pinhole position, which is then reflected to the near-focus position through the ellipsoid reflector, and converges into a point light spot; the first shielding plate and the second The two shielding plates are coaxially arranged, the first shielding plate is annular, the second shielding plate is circular, the inner circle diameter of the first shielding plate is larger than the diameter of the second shielding plate, and both the first shielding plate and the second shielding plate can be in the pinhole and the ellipsoid reflector along the optical axis.

上述婴儿用鼻孔照明装置,所述第一遮挡板能够在针孔和椭球面反射镜之间沿光轴方向移动,通过以下结构实现:In the above-mentioned nostril lighting device for infants, the first shielding plate can move along the optical axis between the pinhole and the ellipsoid reflector, and is realized by the following structure:

所述第一遮挡板的侧壁设置有多个豁口和一个垂直光轴的伸出端,外壳的内壁设置有滑道和第一通槽,所述豁口和滑道相配合,使第一遮挡板能够沿光轴方向移动,所述伸出端从第一通槽中伸出,通过调整伸出端的位置,控制第一遮挡板在外壳中的位置;The side wall of the first shielding plate is provided with a plurality of gaps and a protruding end perpendicular to the optical axis, and the inner wall of the casing is provided with a slideway and a first through groove, and the gaps and the slideway are matched to make the first shielding The plate can move along the direction of the optical axis, the extension end extends from the first through groove, and the position of the first shielding plate in the housing is controlled by adjusting the position of the extension end;

所述伸出端与第一遮挡板之间的连接关系为:伸出端通过转轴与第一遮挡板连接,在伸出端与第一遮挡板之间,还安装有弹簧,在弹簧的作用下,伸出端具有偏离第一通槽的趋势;The connection relationship between the extension end and the first shielding plate is as follows: the extension end is connected with the first shielding plate through the rotating shaft, and a spring is also installed between the extension end and the first shielding plate, and the spring is used for the connection between the extension end and the first shielding plate. down, the protruding end has a tendency to deviate from the first through groove;

所述第一通槽侧壁为锯齿状,伸出端能卡在每一个锯齿中,实现对伸出端的定位,进而实现对第一遮挡板的定位。The side wall of the first through groove is serrated, and the protruding end can be caught in each serration, so as to realize the positioning of the protruding end and then the positioning of the first shielding plate.

上述婴儿用鼻孔照明装置,所述第二遮挡板能够在针孔和椭球面反射镜之间沿光轴方向移动,通过以下结构实现:In the above-mentioned nostril lighting device for infants, the second shielding plate can move along the optical axis between the pinhole and the ellipsoid reflector, and is realized by the following structure:

所述第二遮挡板的侧壁对称设置有两个支撑端,外壳对称设置有两个第二通槽,所述支撑端从第二通槽中伸出;在外壳上套有螺纹,环形旋转端通过在外壳外壁螺纹旋转实现前后移动,在环形旋转端的端面上,设置有凹口,所述凹口内表面与轴承外圈过盈配合安装,在轴承内圈,过盈配合安装环形连接端,所述环形连接端连接支撑端。The side wall of the second shielding plate is symmetrically provided with two supporting ends, and the outer casing is symmetrically provided with two second through grooves, and the supporting ends protrude from the second through grooves; The end is moved back and forth by threading on the outer wall of the casing. On the end face of the annular rotating end, a notch is provided. The inner surface of the notch is installed with interference fit with the outer ring of the bearing. The annular connecting end is connected to the supporting end.

有益效果:Beneficial effects:

第一、在本发明婴儿用鼻孔照明装置中,由于在外壳内,仅包含沿光线传播方向依次同轴设置物镜、针孔、第一遮挡板、第二遮挡板和椭球面反射镜,元件数量少,因此具有结构简单的技术优势;First, in the baby nostril lighting device of the present invention, because in the housing, only the objective lens, the pinhole, the first shielding plate, the second shielding plate and the ellipsoid reflector are arranged coaxially along the light propagation direction in sequence, and the number of components. Therefore, it has the technical advantage of simple structure;

第二、在本发明婴儿用鼻孔照明装置中,由于设置有第一遮挡板和第二遮挡板,因此提供的是环形照明光,只照射鼻孔侧壁,而不照射鼻孔内部,同圆形照明光束相比,除了同样具有给鼻孔侧壁照明的技术效果外,还具有保护鼻孔内部鼻粘膜的作用;Second, in the infant nostril lighting device of the present invention, since the first shielding plate and the second shielding plate are provided, the annular illumination light is provided, which only illuminates the side walls of the nostrils and does not illuminate the interior of the nostrils, which is the same as the circular illumination. Compared with the light beam, in addition to the technical effect of illuminating the side walls of the nostrils, it also has the effect of protecting the nasal mucosa inside the nostrils;

第三、在本发明婴儿用鼻孔照明装置中,由于第一遮挡板和第二遮挡板均能够在针孔和椭球面反射镜之间沿光轴方向移动,因此能够通过第一遮挡板和第二遮挡板的移动,调整环形照明光束的内外圈直径,照射角度,照射强度,使其能够适用于不同鼻子形状、大小的婴儿,增加了鼻孔照明装置的适用范围;Third, in the baby nostril lighting device of the present invention, since both the first shielding plate and the second shielding plate can move in the direction of the optical axis between the pinhole and the ellipsoid reflector, they can pass through the first shielding plate and the second shielding plate. The movement of the second shielding plate adjusts the diameter of the inner and outer circles of the annular lighting beam, the irradiation angle, and the irradiation intensity, so that it can be suitable for babies with different nose shapes and sizes, and the scope of application of the nostril lighting device is increased;

第四、在本发明婴儿用鼻孔照明装置中,由于采用椭球面反射镜进行光束会聚,同传统透镜会聚方式相比,反射镜能够从原理上解决透镜的像差问题,实现无杂散光照射婴儿眼睛,有效避免发散光束或有像差会聚光束使婴儿从熟睡中清醒过来,造成挖鼻屎工作无法进行的问题;Fourth, in the baby nostril lighting device of the present invention, because the ellipsoidal reflector is used to converge the light beam, compared with the traditional lens convergence method, the reflector can solve the aberration problem of the lens in principle, and realizes the irradiation of the baby without stray light. Eyes, effectively avoid diverging beams or converging beams with aberrations to wake the baby up from a deep sleep, resulting in the problem that booger picking cannot be carried out;

第五、在本发明婴儿用鼻孔照明装置中,充分利用椭球面反射镜双焦点共轭性质,即利用从远焦点入射的光束还能从远焦点出射的性质,同透镜结构或平面反射镜或球面反射镜相比,具有大角度照明的有益效果,使得照明光束在鼻孔侧壁截止,进一步保护鼻孔内部的鼻粘膜。Fifth, in the infant nostril illumination device of the present invention, the double-focus conjugate property of the ellipsoid reflector is fully utilized, that is, the property that the light beam incident from the far focus can also exit from the far focus is used, and the same lens structure or plane reflector or Compared with the spherical reflector, it has the beneficial effect of large-angle illumination, so that the illumination beam is cut off at the side wall of the nostril, and further protects the nasal mucosa inside the nostril.

附图说明Description of drawings

图1是本发明婴儿用鼻孔照明装置的结构示意图。FIG. 1 is a schematic structural diagram of a nostril lighting device for infants according to the present invention.

图2是第一遮挡板与外壳之间的配合关系示意图。FIG. 2 is a schematic diagram of the cooperation relationship between the first shielding plate and the housing.

图3是伸出端卡在锯齿中的示意图。Figure 3 is a schematic view of the protruding end stuck in the saw teeth.

图4第二遮挡板与外壳之间的结构关系示意图。FIG. 4 is a schematic diagram of the structural relationship between the second shielding plate and the housing.

图中:1物镜、2针孔、3第一遮挡板、31伸出端、32弹簧、4第二遮挡板、41支撑端、42环形旋转端、43轴承、44环形连接端、5椭球面反射镜、6外壳。In the figure: 1 objective lens, 2 pinhole, 3 first shielding plate, 31 extending end, 32 spring, 4 second shielding plate, 41 supporting end, 42 annular rotating end, 43 bearing, 44 annular connecting end, 5 ellipsoid surface Mirror, 6 housings.

具体实施例specific embodiment

下面结合附图对本发明具体实施例作进一步详细说明。The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

具体实施例一Specific embodiment one

本实施例的婴儿用鼻孔照明装置,结构示意图如图1所示。该婴儿用鼻孔照明装置,在外壳6内,沿光线传播方向依次同轴设置物镜1、针孔2、第一遮挡板3、第二遮挡板4和椭球面反射镜5;所述物镜1焦点位置和椭球面反射镜5远焦点位置重合,重合处设置针孔2;平行光束沿光轴方向照射物镜1,在针孔2位置形成点光源,再经过椭球面反射镜5反射至近焦点位置,会聚成点光斑;所述第一遮挡板3和第二遮挡板4同轴设置,第一遮挡板3为环形,第二遮挡板4为圆形,第一遮挡板3内圆直径大于第二遮挡板4直径,第一遮挡板3和第二遮挡板4均能够在针孔2和椭球面反射镜5之间沿光轴方向移动。The schematic diagram of the structure of the nostril lighting device for infants in this embodiment is shown in FIG. 1 . In the nostril lighting device for infants, in the casing 6, an objective lens 1, a pinhole 2, a first shielding plate 3, a second shielding plate 4 and an ellipsoid reflector 5 are sequentially arranged coaxially along the light propagation direction; the objective lens 1 focuses The position coincides with the far focus position of the ellipsoid reflector 5, and the pinhole 2 is set at the overlap; the parallel beam illuminates the objective lens 1 along the optical axis, and a point light source is formed at the position of the pinhole 2, which is then reflected to the near focus position by the ellipsoid reflector 5. Converged into a spot light spot; the first shielding plate 3 and the second shielding plate 4 are coaxially arranged, the first shielding plate 3 is annular, the second shielding plate 4 is circular, and the inner diameter of the first shielding plate 3 is larger than that of the second shielding plate 3 The diameter of the shielding plate 4, the first shielding plate 3 and the second shielding plate 4 can be moved along the optical axis direction between the pinhole 2 and the ellipsoidal mirror 5.

具体实施例二Specific embodiment two

本实施例的婴儿用鼻孔照明装置,在具体实施例一的基础上,进一步限定第一遮挡板3能够在针孔2和椭球面反射镜5之间沿光轴方向移动,通过以下结构实现:The baby nostril lighting device of the present embodiment, on the basis of the specific embodiment 1, further defines that the first shielding plate 3 can move along the optical axis between the pinhole 2 and the ellipsoid reflector 5, and is realized by the following structure:

所述第一遮挡板3的侧壁设置有多个豁口和一个垂直光轴的伸出端31,外壳6的内壁设置有滑道和第一通槽,所述豁口和滑道相配合,使第一遮挡板3能够沿光轴方向移动,所述伸出端31从第一通槽中伸出,通过调整伸出端31的位置,控制第一遮挡板3在外壳6中的位置;The side wall of the first shielding plate 3 is provided with a plurality of gaps and a protruding end 31 perpendicular to the optical axis. The inner wall of the housing 6 is provided with a slideway and a first through groove. The first shielding plate 3 can move along the direction of the optical axis, the extension end 31 protrudes from the first through groove, and the position of the first shielding plate 3 in the housing 6 is controlled by adjusting the position of the extension end 31;

所述伸出端31与第一遮挡板3之间的连接关系为:伸出端31通过转轴与第一遮挡板3连接,在伸出端31与第一遮挡板3之间,还安装有弹簧32,在弹簧32的作用下,伸出端31具有偏离第一通槽的趋势;The connection relationship between the extending end 31 and the first shielding plate 3 is as follows: the extending end 31 is connected with the first shielding plate 3 through the rotating shaft, and between the extending end 31 and the first shielding plate 3, there is also installed a The spring 32, under the action of the spring 32, the protruding end 31 has a tendency to deviate from the first through groove;

第一遮挡板3与外壳6之间的配合关系示意图如图2所示;The schematic diagram of the mating relationship between the first shielding plate 3 and the housing 6 is shown in FIG. 2 ;

所述第一通槽侧壁为锯齿状,伸出端31能卡在每一个锯齿中,实现对伸出端31的定位,进而实现对第一遮挡板3的定位。The side wall of the first through groove is serrated, and the protruding end 31 can be caught in each serration to realize the positioning of the protruding end 31 and then the positioning of the first shielding plate 3 .

伸出端31卡在锯齿中的示意图如图3所示,该图也是图2的俯视图(未按照比例绘制)。A schematic diagram of the protruding end 31 being caught in the sawtooth is shown in FIG. 3 , which is also a top view (not drawn to scale) of FIG. 2 .

具体实施例三Specific embodiment three

本实施例的婴儿用鼻孔照明装置,在具体实施例一的基础上,进一步限定第二遮挡板4能够在针孔2和椭球面反射镜5之间沿光轴方向移动,通过以下结构实现:The baby's nostril lighting device of the present embodiment, on the basis of the specific embodiment 1, further defines that the second shielding plate 4 can move along the optical axis between the pinhole 2 and the ellipsoid reflector 5, and is realized by the following structure:

所述第二遮挡板4的侧壁对称设置有两个支撑端41,外壳6对称设置有两个第二通槽,所述支撑端41从第二通槽中伸出;在外壳6上套有螺纹,环形旋转端42通过在外壳6外壁螺纹旋转实现前后移动,在环形旋转端42的端面上,设置有凹口,所述凹口内表面与轴承43外圈过盈配合安装,在轴承43内圈,过盈配合安装环形连接端44,所述环形连接端44连接支撑端41。The side wall of the second shielding plate 4 is symmetrically provided with two support ends 41 , the housing 6 is symmetrically provided with two second through slots, and the support ends 41 protrude from the second through slots; There are threads, the annular rotating end 42 can move back and forth by threading on the outer wall of the casing 6, and a notch is provided on the end face of the annular rotating end 42, and the inner surface of the notch is installed with an interference fit with the outer ring of the bearing 43, and is installed on the bearing 43. In the inner ring, an annular connecting end 44 is installed with interference fit, and the annular connecting end 44 is connected to the supporting end 41 .

第二遮挡板4与外壳6之间的结构关系示意图如图4所示。A schematic diagram of the structural relationship between the second shielding plate 4 and the housing 6 is shown in FIG. 4 .

Claims (1)

1. The nostril illuminating device with the second shielding plate is characterized in that an objective lens (1), a pinhole (2), a first shielding plate (3), a second shielding plate (4) and an ellipsoidal reflector (5) are coaxially arranged in the shell (6) along the light propagation direction in sequence; the focal position of the objective lens (1) is superposed with the far focal position of the ellipsoidal reflector (5), and a pinhole (2) is arranged at the superposed position; the parallel light beams irradiate the objective lens (1) along the direction of an optical axis to form a point light source at the position of the pinhole (2), and the point light source is reflected to a position close to a focus point by the ellipsoidal reflector (5) and converged into a point light spot; the first shielding plate (3) and the second shielding plate (4) are coaxially arranged, the first shielding plate (3) is annular, the second shielding plate (4) is circular, the diameter of the inner circle of the first shielding plate (3) is larger than that of the second shielding plate (4), and the first shielding plate (3) and the second shielding plate (4) can move between the pinhole (2) and the ellipsoidal reflector (5) along the direction of an optical axis;
the second shielding plate (4) can move between the pinhole (2) and the ellipsoidal reflector (5) along the direction of the optical axis, and the structure is as follows:
the side wall of the second shielding plate (4) is symmetrically provided with two supporting ends (41), the shell (6) is symmetrically provided with two second through grooves, and the supporting ends (41) extend out of the second through grooves; the outer shell (6) is sleeved with threads, the annular rotating end (42) moves back and forth through thread rotation on the outer wall of the outer shell (6), a notch is formed in the end face of the annular rotating end (42), the inner surface of the notch is in interference fit with the outer ring of the bearing (43), an annular connecting end (44) is in interference fit with the inner ring of the bearing (43), and the annular connecting end (44) is connected with the supporting end (41).
CN201910109296.3A 2017-01-11 2017-01-11 Nostril illuminating device with second shielding plate Expired - Fee Related CN109654393B (en)

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CN109654392A (en) 2019-04-19
CN109654393A (en) 2019-04-19

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