WO2022127641A1 - 一种摄像机调整结构及便携式鸣笛抓拍电子设备 - Google Patents

一种摄像机调整结构及便携式鸣笛抓拍电子设备 Download PDF

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Publication number
WO2022127641A1
WO2022127641A1 PCT/CN2021/135890 CN2021135890W WO2022127641A1 WO 2022127641 A1 WO2022127641 A1 WO 2022127641A1 CN 2021135890 W CN2021135890 W CN 2021135890W WO 2022127641 A1 WO2022127641 A1 WO 2022127641A1
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WIPO (PCT)
Prior art keywords
camera
mirror
adjustment structure
fixing plate
plate
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PCT/CN2021/135890
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English (en)
French (fr)
Inventor
孙雄飞
毛峻伟
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苏州清听声学科技有限公司
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Publication of WO2022127641A1 publication Critical patent/WO2022127641A1/zh

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/017—Detecting movement of traffic to be counted or controlled identifying vehicles
    • G08G1/0175—Detecting movement of traffic to be counted or controlled identifying vehicles by photographing vehicles, e.g. when violating traffic rules
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M7/00—Details of attaching or adjusting engine beds, frames, or supporting-legs on foundation or base; Attaching non-moving engine parts, e.g. cylinder blocks
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/17—Bodies with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
    • 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
    • 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
    • H04N23/51—Housings
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means

Definitions

  • the invention relates to a camera adjustment structure and a portable electronic device for whistling and capturing, belonging to the technical field of camera shooting.
  • the whistle noise has become an important problem in the urban environment.
  • the traffic control department has set up a no-honking area in a specific area. Due to the difficulty of obtaining evidence, it is difficult to obtain evidence and punish illegal vehicles.
  • the portable whistle and capture device has the advantage of mobile use, but because the portable whistle and capture device needs a built-in camera, and the shooting range of the camera needs to cooperate with the orientation of the voice recognition system to capture accurate illegal images , that is to say, it is necessary to ensure that the shooting angle of the camera is highly matched with the source of the whistle sound.
  • the sound recognition system of the traditional whistle and capture device is installed independently from the camera, so its monitoring direction can be adjusted independently. The actual adjustment of the camera is difficult due to its relatively large size.
  • the purpose of the present invention is to provide a camera adjustment structure and a portable whistle-snapping electronic device, which solves the technical problem of difficulty in adjusting the camera shooting angle of the portable whistle-snapping device in the prior art.
  • a camera adjustment structure comprising a mirror fixing plate, a mirror carrier and a mirror connected to the mirror carrier, the mirror fixing plate is inclined to the shooting direction of the camera, and the mirror carrier passes through at least three non-collinear
  • the distributed spring bolt assemblies are connected to the mirror fixing plate;
  • the spring bolt assembly includes a bolt and a spring, one end of the bolt is fixedly connected to the mirror carrier plate, the other end passes through the mirror fixing plate and is provided with a nut, and the two ends of the spring are respectively connected to the mirror fixing plate and the mirror carrier plate.
  • the mirror carrier is connected to the edge of the mirror through the side baffle, and the side baffle and the mirror carrier are an integral structure.
  • the aforementioned camera adjustment structure further includes at least two pressure plates, the pressure plates are connected to the reflector fixing plate, and at least two pressure plates are connected to opposite sides of the reflector.
  • the pressure plate is provided with at least two elastic pressure pieces, and the elastic pressure pieces are connected to the reflection surface of the reflector.
  • the pressure plate is connected to the mirror carrier plate through screws.
  • the spring is sleeved on the bolt.
  • the nut is a wing nut.
  • the mirror fixing plate is further provided with a horizontal section, the horizontal section is provided with a camera connection hole, and the lens of the camera passes through the camera connection hole.
  • a portable whistle-snapping electronic device includes a casing and any one of the aforementioned camera adjustment structures, and a mirror fixing plate is connected to the casing.
  • the casing is further provided with a shooting entrance shield, and the angles between the reflector, the shooting entrance shield, and the axis of the camera are equal.
  • the present invention can realize the adjustment of the shooting angle of the camera without adjusting the position of the camera relative to the casing, and the adjustment process is fast and efficient, and the adjustment precision is also high due to the use of thread adjustment.
  • the camera adjustment structure described in the present invention can enable the cameras to be placed vertically in the casing, which can be achieved without changing the existing cameras.
  • the thickness of the entire portable whistle and capture electronic device is greatly reduced, and the portability is improved.
  • Fig. 1 is the camera adjustment structure view one of the present invention (hidden mirror);
  • FIG. 2 is a second view of the camera adjustment structure of the present invention.
  • Fig. 3 is the camera adjustment structure view three of the present invention.
  • Fig. 4 is the camera adjustment structure view four of the present invention.
  • Fig. 5 is the sectional view of the portable whistle and capture electronic device of the present invention.
  • this embodiment discloses a camera adjustment structure, including a mirror fixing plate 2 , a mirror carrier plate 3 and a mirror 9 connected to the mirror carrier plate 3 , and the mirror fixing plate 2
  • the mirror carrier plate 3 is connected to the mirror fixing plate 2 through at least three non-collinear spring bolt assemblies arranged obliquely toward the shooting direction of the camera 1 .
  • the mirror fixing plate 2 is V-shaped as a whole, and one side is also provided with a reserved hole for the camera.
  • the camera 1 passes through the reserved hole for the camera, which is convenient for the installation of the mirror fixing plate 2 and the determination of the relative position between the mirror fixing plate 2 and the camera 1 .
  • the spring bolt assembly includes a bolt 8 and a spring 5.
  • One end of the bolt 8 is fixedly connected to the mirror carrier plate 3, and the other end passes through the mirror fixing plate 2 and is provided with a nut.
  • Both ends of the spring 5 are respectively connected to the mirror fixing plate 2 and the mirror.
  • the carrier plate 3 under the action of the spring 5, the mirror fixing plate 2 and the mirror carrier plate 3 always have elastic force to increase the distance between them. Since there are at least three spring bolt assemblies and they are not collinear, the angle between the mirror fixing plate 2 and the mirror carrier plate 3 can be adjusted by rotating the nut, and can be adjusted along any axis within a certain range.
  • the three spring bolt assemblies are preferably distributed in an L shape (right triangle), and two of them are distributed horizontally, and two of them are distributed vertically.
  • the two horizontally distributed as the axis adjust the spring bolt assembly at the highest or lowest position.
  • the nut in this embodiment is preferably a wing nut.
  • the spring 5 is preferably sleeved on the bolt 8, so that the spring 5 can be guided and positioned.
  • the fixing method of the reflector 9 is as follows:
  • the mirror carrier plate 3 is connected to the edge of the mirror 9 through the side baffle 31, and the side baffle 31 and the mirror carrier plate 3 are an integral structure. Plate 3 is obtained by bending.
  • there are at least two pressing plates 4 connected to the mirror fixing plate 2 and at least two pressing plates 4 are connected to opposite sides of the mirror 9 .
  • each pressing plate 4 is provided with at least two elastic pressing pieces 41, and the elastic pressing pieces 41 are connected to the reflective surface of the reflector 9, so that the elastic pressing pieces 41 can always be pressed with elastic force Mirror 9 to prevent it from loosening.
  • the pressing plate 4 can be connected to the mirror carrier plate 3 by screws.
  • This embodiment also discloses a portable electronic device for whistling and capturing photos, which includes a casing and the aforementioned camera adjustment structure in this embodiment.
  • the mirror fixing plate 2 is connected to the casing. Specifically, two ends of the mirror fixing plate 2 are respectively provided with There are an upper flanging 21 and a lower flanging 22, and the upper flanging 21 and the lower flanging 22 are mounted on the casing by screws.
  • the mirror fixing plate 2 of this embodiment is further provided with a horizontal section 24, the horizontal section 24 is provided with a camera connecting hole 23, and the lens of the camera 1 passes through the camera connecting hole 23, so that the connection between the mirror fixing plate 2 and the lens of the camera 1 can be improved.
  • the position accuracy is also easy to adjust the distance between the lens of the camera 1 and the mirror 9 .
  • the casing is further provided with a photographing entrance shield 7, and the photographing entrance shield 7 is usually made of transparent glass or resin and used as a photographing entrance.
  • the shooting entrance shield 7 is perpendicular to the plane where the lens of the mirror 9 is located, and the angles between the mirror 9 and the shooting entrance shield 7 and the axis of the camera 1 are equal.
  • the portable whistle and capture electronic device When in use, the portable whistle and capture electronic device is also equipped with a sound pickup device (for detecting whistle sound) and a supplementary light device (such as LED lights).
  • a sound pickup device for detecting whistle sound
  • a supplementary light device such as LED lights.
  • the whistle sound When the whistle sound is detected, immediately turn on the camera 1 to capture the illegal vehicle. Since the capture requirements are relatively high and the license plate must be captured, when the camera 1 cannot meet the shooting requirements, it is necessary to ensure that the angle of the entire device remains unchanged. To adjust the shooting angle, since the position between the camera 1 and the housing 6 has been fixed, it is only necessary to adjust the angle of the mirror 9 .
  • the angle of the reflector 9 relative to the reflector carrier 3 can be adjusted within a certain angle range by rotating the corresponding wing nut.
  • this embodiment can realize the adjustment of the shooting angle of the camera 1 without adjusting the position of the camera 1 relative to the housing 1 , and the adjustment process is fast and efficient, and the adjustment accuracy is also high due to the use of thread adjustment. Since the cameras used for snapshots in the prior art are usually large in size and long in length, the camera adjustment structure described in this embodiment can enable the cameras to be placed vertically in the housing 6, which can be achieved without changing the existing Under the premise of the camera, the thickness of the entire portable whistle and capture electronic device is greatly reduced, and the portability is improved.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Studio Devices (AREA)

Abstract

一种摄像机调整结构及便携式鸣笛抓拍电子设备，包括反光镜固定板（2）、反光镜载板（3）及连接于反光镜载板（3）的反光镜（9），反光镜固定板（2）相对于摄像机（1）的拍摄方向倾斜设置，反光镜载板（3）通过至少三个不共线分布的弹簧螺栓组件连接于反光镜固定板（2）；弹簧螺栓组件包括螺栓（8）、弹簧（5），螺栓（8）一端固定连接于反光镜载板（3），另一端穿过反光镜固定板（2）且设有螺母，弹簧（5）两端分别连接反光镜固定板（2）、反光镜载板（3）。该摄像机调整结构能够在不调整摄像机相对于壳体位置的前提下实现摄像机拍摄角度的调整，并且调整过程快速高效，还能够使摄像机在壳体内竖向放置，使整个便携式鸣笛抓拍电子设备的厚度大大降低，提升便携性。

Description

一种摄像机调整结构及便携式鸣笛抓拍电子设备 技术领域
本发明涉及摄像机调整结构及便携式鸣笛抓拍电子设备，属于摄像机拍摄技术领域。
背景技术
随着机动车保有量持续增长，其鸣笛噪音已成为市区环境的重要问题，交管部门在特定区域设置禁鸣区，由于取证困难很难对违法车辆进行取证和处罚。便携式鸣笛抓拍设备相比传统鸣笛抓拍设备具有移动使用的优势，但是由于便携式鸣笛抓拍设备需要内置摄像机，且摄像机的拍摄范围需与声音识别系统的方位互相配合才能抓拍到准确的违法图像，也就是说需要保证摄像头的拍摄角度与鸣笛声的来源高度匹配，传统鸣笛抓拍设备声音识别系统与摄像机是独立安装，因此其监测方向是可以独立调整的，而便携式鸣笛抓拍设备的摄像机由于体积相对较大，因此实际调节比较困难。
发明内容
为解决现有技术的不足，本发明的目的在于提供一种摄像机调整结构及便携式鸣笛抓拍电子设备，解决了现有技术中便携式鸣笛抓拍设备摄像机拍摄角度调节困难的技术问题。
为了实现上述目标，本发明采用如下的技术方案：
一种摄像机调整结构，包括反光镜固定板、反光镜载板及连接于反光镜载板的反光镜，反光镜固定板向摄像机的拍摄方向倾斜设置，反光镜载板通过至少三个不共线分布的弹簧螺栓组件连接于反光镜固定板；
弹簧螺栓组件包括螺栓、弹簧，螺栓一端固定连接于反光镜载板，另一端穿过反光镜固定板且设有螺母，弹簧两端分别连接反光镜固定板、反光镜载板。
优选，前述的一种摄像机调整结构，反光镜载板通过侧挡板连接反光镜的边沿，且侧挡板与反光镜载板是一体式结构。
优选，前述的一种摄像机调整结构，还包括至少两个压板，压板连接于反光镜固定板，且至少有两个压板连接于反光镜的相对边。
优选，前述的一种摄像机调整结构，压板设有至少两个弹性压片，弹性压片连接于反光镜的反射面。
优选，前述的一种摄像机调整结构，压板通过螺钉连接于反光镜载板。
优选，前述的一种摄像机调整结构，弹簧套接于螺栓。
优选，前述的一种摄像机调整结构，螺母是蝶形螺母。
优选，前述的一种摄像机调整结构，反光镜固定板还设有水平段，水平段设有摄像机连接孔，摄像机的镜头穿过摄像机连接孔。
一种便携式鸣笛抓拍电子设备，包含壳体及前述任意一项的摄像机调整结构，反光镜固定板连接于壳体。
优选，前述的便携式鸣笛抓拍电子设备，壳体还设有拍摄入口挡片，反光镜与拍摄入口挡片、摄像机轴线之间的角度相等。
本发明所达到的有益效果：
相对于现有技术，本发明能够在不调整摄像机相对于壳体位置的前提下实现摄像机拍摄角度的调整，并且调整过程快速高效，由于采用螺纹调节，因此调节精度也较高。
由于现有技术中用于抓拍的摄像机体积通常较大、且长度较长，因此采用本发明记载的摄像机调整结构能够使摄像机在壳体内竖向放置，这就能够在不改变现有摄像头的前提下，使整个便携式鸣笛抓拍电子设备的厚度大大降低，提升便携性。
附图说明
图1是本发明摄像机调整结构视图一(隐藏反光镜)；
图2是本发明摄像机调整结构视图二；
图3是本发明摄像机调整结构视图三；
图4是本发明摄像机调整结构视图四；
图5是本发明便携式鸣笛抓拍电子设备的剖视图；
图中附图标记的含义：1-摄像机；2-反光镜固定板；3-反光镜载板；4-压板；5-弹簧；6-壳体；7-拍摄入口挡片；21-上翻边；22-下翻边；23-摄像机连接孔；24-水平段；31-侧挡板；41-弹性压片；8-螺栓；9-反光镜。
具体实施方式
下面结合附图对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。
如图1至图4所示：本实施例公开了一种摄像机调整结构，包括反光镜固定板2、反光镜载板3及连接于反光镜载板3的反光镜9，反光镜固定板2向摄像机1的拍摄方向倾斜设置，反光镜载板3通过至少三个不共线分布的弹簧螺栓组件连接于反光镜固定板2。
反光镜固定板2整体呈V型，其一边还设有摄像机预留孔，摄像机1穿过该摄像机预留孔，便于反光镜固定板2的安装以及与摄像机1之间相对位置的确定。
弹簧螺栓组件包括螺栓8、弹簧5，螺栓8一端固定连接于反光镜载板3，另一端穿过反 光镜固定板2且设有螺母，弹簧5两端分别连接反光镜固定板2、反光镜载板3，在弹簧5的作用下，反光镜固定板2、反光镜载板3始终具有使两者间距增大的弹性力。由于弹簧螺栓组件至少有三个，且不共线，因此可通过旋转螺母对反光镜固定板2、反光镜载板3之间的角度进行调整，并且可在一定范围内沿着任意轴线进行调整。三个弹簧螺栓组件最好呈L型分布(直角三角形)，且其中两个呈水平分布，其中两个呈竖直分布，当调整竖直方向的角度时，以水平分布的两个为轴心，调整最高或最低处的弹簧螺栓组件，当调整水平方向的角度时，以竖直的两个为轴心，调整最左边或最右边的弹簧螺栓组件。为了便于调整，本实施例的螺母最好采用蝶形螺母。弹簧5最好套接于螺栓8，这样能够对弹簧5起到导向、定位的作用。反光镜9的固定方式如下：
反光镜载板3通过侧挡板31连接反光镜9的边沿，且侧挡板31与反光镜载板3是一体式结构，所谓一体式结构，就是指侧挡板31是直接通过反光镜载板3折弯得到的。本实施例还至少两个压板4，压板4连接于反光镜固定板2，且至少有两个压板4连接于反光镜9的相对边。具体的，对比图1及图4：每个压板4设有至少两个弹性压片41，弹性压片41连接于反光镜9的反射面，这样能够使弹性压片41始终以弹性力压紧反光镜9，避免其发生松动。压板4可通过螺钉连接于反光镜载板3。
本实施例还公开一种便携式鸣笛抓拍电子设备，包含壳体及本实施例前述的摄像机调整结构，反光镜固定板2连接于壳体，具体的，反光镜固定板2的两端分别设有上翻边21、下翻边22，上翻边21、下翻边22通过螺钉安装于壳体。
本实施例的反光镜固定板2还设有水平段24，水平段24设有摄像机连接孔23，摄像机1的镜头穿过摄像机连接孔23，这样能够提升反光镜固定板2与摄像机1镜头的位置精度，同时也便于调节摄像机1镜头与反光镜9的间距。
壳体还设有拍摄入口挡片7，拍摄入口挡片7通常采用透明玻璃或树脂，作为拍摄入口使用。其中，在绝大多数情况下，拍摄入口挡片7垂直于反光镜9镜头所在的平面，反光镜9与拍摄入口挡片7、摄像机1轴线之间的角度相等。
使用时，便携式鸣笛抓拍电子设备还设有拾音设备(用于检测鸣笛声)及补光设备(如LED灯)，拾音设备及补光设备的工作面朝向相同，当拾音设备检测到鸣笛声时，立刻开启摄像机1对违章车辆进行抓拍，由于抓怕要求比较高且必须抓拍到车牌，因此当摄像机1无法达到拍摄要求时，需要在保证整个设备角度不变的情况下对拍摄角度进行调整，由于摄像机1与壳体6之间位置已固定，因此只需对反光镜9的角度进行调整即可。旋转相应的蝶形螺母即可实现反光镜9在一定角度范围内相对于反光镜载板3角度的调整。
相对于现有技术，本实施例能够在不调整摄像机1相对于壳体1位置的前提下实现摄像机1拍摄角度的调整，并且调整过程快速高效，由于采用螺纹调节，因此调节精度也较高。由于现有技术中用于抓拍的摄像机体积通常较大、且长度较长，因此采用本实施例记载的摄像机调整结构能够使摄像机在壳体6内竖向放置，这就能够在不改变现有摄像头的前提下，使整个便携式鸣笛抓拍电子设备的厚度大大降低，提升便携性。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和变形，这些改进和变形也应视为本发明的保护范围。

Claims (10)

  1. 一种摄像机调整结构，其特征在于，包括反光镜固定板、反光镜载板及连接于反光镜载板的反光镜，所述反光镜固定板向摄像机的拍摄方向倾斜设置，所述反光镜载板通过至少三个不共线分布的弹簧螺栓组件连接于反光镜固定板；
    所述弹簧螺栓组件包括螺栓、弹簧，所述螺栓一端固定连接于反光镜载板，另一端穿过反光镜固定板且设有螺母，所述弹簧两端分别连接反光镜固定板、反光镜载板。
  2. 根据权利要求2所述的一种摄像机调整结构，其特征在于，所述反光镜载板通过侧挡板连接反光镜的边沿，且侧挡板与反光镜载板是一体式结构。
  3. 根据权利要求1所述的一种摄像机调整结构，其特征在于，还包括至少两个压板，所述压板连接于反光镜固定板，且至少有两个压板连接于反光镜的相对边。
  4. 根据权利要求3所述的一种摄像机调整结构，其特征在于，所述压板设有至少两个弹性压片，所述弹性压片连接于反光镜的反射面。
  5. 根据权利要求4所述的一种摄像机调整结构，其特征在于，所述压板通过螺钉连接于反光镜载板。
  6. 根据权利要求1所述的一种摄像机调整结构，其特征在于，所述弹簧套接于螺栓。
  7. 根据权利要求1所述的一种摄像机调整结构，其特征在于，所述螺母是蝶形螺母。
  8. 根据权利要求1所述的一种摄像机调整结构，其特征在于，所述反光镜固定板还设有水平段，所述水平段设有摄像机连接孔，所述摄像机的镜头穿过摄像机连接孔。
  9. 一种便携式鸣笛抓拍电子设备，其特征在于，包含壳体及，权利要求1至权利要求8任意一项所述的摄像机调整结构，所述反光镜固定板连接于壳体。
  10. 根据权利要求9所述的一种便携式鸣笛抓拍电子设备，所述壳体还设有拍摄入口挡片，所述反光镜与拍摄入口挡片、摄像机轴线之间的角度相等。
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