WO2018068305A1 - 可实现光学变焦的光学动捕摄像机 - Google Patents

可实现光学变焦的光学动捕摄像机 Download PDF

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Publication number
WO2018068305A1
WO2018068305A1 PCT/CN2016/102133 CN2016102133W WO2018068305A1 WO 2018068305 A1 WO2018068305 A1 WO 2018068305A1 CN 2016102133 W CN2016102133 W CN 2016102133W WO 2018068305 A1 WO2018068305 A1 WO 2018068305A1
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WIPO (PCT)
Prior art keywords
optical
liquid crystal
zoom
realizing
crystal element
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PCT/CN2016/102133
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English (en)
French (fr)
Inventor
姚劲
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深圳市瑞立视多媒体科技有限公司
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Application filed by 深圳市瑞立视多媒体科技有限公司 filed Critical 深圳市瑞立视多媒体科技有限公司
Priority to CN201680003671.0A priority Critical patent/CN107111211A/zh
Priority to PCT/CN2016/102133 priority patent/WO2018068305A1/zh
Publication of WO2018068305A1 publication Critical patent/WO2018068305A1/zh

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    • 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
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
    • G02F1/294—Variable focal length devices

Definitions

  • the present invention belongs to the technical field of video cameras, and in particular, to an optical motion capture camera that can realize optical zoom.
  • optical motion capture systems are widely used in the fields of film animation special effects production, large-scale game production, and life science research.
  • the core component of the optical motion capture system is the optical motion camera.
  • the camera is mainly composed of an image sensor, a lens, an infrared band pass filter unit, an infrared light source, and a camera control circuit.
  • the infrared bandpass filter unit is used to filter out ambient light and only pass certain wavelengths of infrared light.
  • the light from the infrared source illuminates the captured object (humans, animals, etc.) and is reflected by the reflective sphere bound to the captured object.
  • the reflected light passes through the lens, the infrared bandpass filter unit, and is finally recorded by the image sensor.
  • optical motion capture cameras are widely used, and therefore, the venues and scenarios are also different.
  • the current optical motion capture cameras usually have the following technical problems: Sometimes, the camera is expected to have a wider field of view, and it is sometimes desirable that the camera has a farther field of view, and the two cannot be both.
  • the traditional method is to use the zoom lens on the optical camera to achieve optical zoom, which can adjust the focal length of the camera when the need of a wider field of view, so that the camera has a wider field of view, and the camera can be adjusted with a larger field of view. Capture further afield.
  • the conventional optical zoom camera that can realize optical zoom achieves optical zoom by a zoom lens has the following technical problems:
  • the position of the lens is relatively fixed with the camera light source, that is, the light source is arranged around the lens.
  • the zoom lens is zoomed in, part of the field of view of the lens may be blocked by the light source.
  • the zoom lens is extended, the illumination path of some of the light source may be blocked by the protruding part of the lens. , so that the variable range of the focal length is limited by the lens expansion and contraction.
  • the lens the integrated imaging capability is worse than the fixed-focus lens, which affects the capture accuracy of the camera.
  • a primary object of the present invention is to provide an optical motion capture camera capable of realizing optical zoom, which aims to solve the problem that a conventional optical zoom camera capable of realizing optical zoom has a small variable focal length range and poor image quality.
  • optical motion capture camera that can realize optical zoom, including:
  • an infrared light source disposed on one side of the optical lens
  • a zoom liquid crystal element disposed between the photosensitive device and the optical lens and used to change a focal length of the optical imaging system, and a liquid crystal electrically coupled to the zoom liquid crystal element and used to drive the zoom liquid crystal element A drive that reverses the layer.
  • the zoom liquid crystal element is a single-crystal liquid crystal lens in a sheet shape. Further, a polarizing element for polarizing the light to match the operating state of the zoom liquid crystal element is provided between the optical lens and the zoom liquid crystal element.
  • the polarizing element is in the form of a sheet, and the polarizing element in the form of a sheet is angularly disposed on the zoom liquid crystal element.
  • a filter element for filtering ambient light is further disposed between the photosensitive device and the optical lens.
  • the filter element is set as an infrared filter.
  • zoom liquid crystal element and the filter element are both locked in a frame.
  • the optical lens includes a base that cooperates with the circuit control board, and the zoom liquid crystal element is connected to the base through a support frame provided.
  • the infrared light source comprises an infrared light source PCB board, and the infrared light source is provided on the PCB board. Light bulbs spaced apart.
  • the driving device includes a power source and a voltage driving element for converting the power source into a driving voltage to drive a liquid crystal layer of the zoom liquid crystal element to be twisted.
  • the driving device is disposed on the circuit control board.
  • the circuit board, the photosensitive device and the zoom liquid crystal element are all placed in a camera outer frame, and the camera outer frame is connected to the optical lens.
  • the camera outer frame is screwed to the optical lens.
  • a connecting rod for connecting the camera outer frame and the infrared light source is disposed between the camera outer frame and the infrared light source.
  • the optical zoom camera capable of realizing optical zoom provided by the present invention, using an optical camera capable of realizing optical zoom, by a zoom liquid crystal element disposed between the photosensitive device and the optical lens, and a driving device thereof Under the action of electrical matching, the driving device changes the rotation direction of the liquid crystal of the zoom liquid crystal element by using the electric field, that is, the liquid crystal layer of the driving liquid crystal element is twisted, and the focal length of the liquid crystal element is changed to achieve the conversion of the focus point, so that The focal length of the entire optical imaging system changes.
  • variable range of the zoom ⁇ is not limited by the lens, that is, the external structure of the zoom ⁇ zoom liquid crystal element does not change, only the rotation of the liquid crystal layer, therefore, the focal length variable range is large, and the image quality is it is good.
  • FIG. 1 is a schematic diagram showing the internal structure of an optical camera capable of realizing optical zoom according to an embodiment of the present invention
  • FIG. 2 is a cross-sectional view of an optical camera that can realize optical zoom according to an embodiment of the present invention
  • FIG. 3 is a schematic structural view of a frame portion of an optical motion capture camera that can realize optical zoom according to an embodiment of the present invention.
  • the present invention provides an optical motion capture camera that can realize optical zoom by changing the zoom liquid crystal element 34 disposed between the photosensitive device 4 and the optical lens 1 and its electrical cooperation with the driving device.
  • the focal length of the liquid crystal element 34 is zoomed to achieve the conversion of the focus point, and therefore, the focal length can be varied in a wide range, and the image quality is good.
  • the optical zoom camera capable of realizing optical zoom comprises an optical lens 1, an infrared light source 2 disposed on one side of the optical lens 1, and placed on the other side of the optical lens 1 and a photosensitive device 4 corresponding to the optical lens 1, a circuit control board 5 electrically connected to the photosensitive device 4, a lens 3 disposed between the photosensitive device 4 and the optical lens 1 for changing the focal length of the optical imaging system, and a zoom liquid crystal element A driving device for electrically twisting the liquid crystal layer of the zoom liquid crystal element 34.
  • An optical camera capable of realizing optical zoom by using an optical camera that can realize optical zoom, by a zoom liquid crystal element 34 disposed between the photosensitive device 4 and the optical lens 1 and Under the action of the electrical cooperation with the driving device, the driving device changes the rotation direction of the liquid crystal of the zoom liquid crystal element 34 by the electric field, that is, the liquid crystal layer of the driving zoom liquid crystal element 34 is twisted, and by changing the focal length of the zoom liquid crystal element 34, The conversion of the focus point is achieved such that the focal length of the entire optical imaging system changes.
  • variable range of the zoom ⁇ is not limited by the lens, that is, the external structure of the zoom ⁇ zoom liquid crystal element 34 does not change, only the rotation of the liquid crystal layer, and therefore, the focal length can be varied in a wide range, and imaging Good quality.
  • the zoom liquid crystal element 34 is provided as a single liquid crystal lens in the form of a sheet, and at the time of use, it is easy to achieve zooming by changing the focal length of the single liquid crystal lens itself.
  • the monomer liquid crystal lens is modified. The light path of the light that is reflected back.
  • the monomer liquid crystal lens can adopt the conventional conventional techniques.
  • the monomer liquid crystal lens is disposed in a rectangular cross-sectional structure to make the liquid crystal lens highly stable and to increase the influence of the electric field on the single liquid crystal lens.
  • a polarizing element 35 for polarizing the light to match the operating state of the zoom liquid crystal element 34 is provided between the optical lens 1 and the zoom liquid crystal element 34.
  • the polarizing element 35 is in the form of a sheet, a thin sheet.
  • the polarizing element 35 is angularly disposed on the zoom liquid crystal element 34.
  • the polarizing element 35 is set as a polarizing plate, and the polarizing plate can be a conventional optical fiber.
  • the polarizing plate is an optical element which can convert natural light into polarized light.
  • the polarizing plate has a function of shielding and transmitting incident light, and can transmit longitudinal light or lateral light as a kind of shielding.
  • the prior art polarizing plate is a composite material in which a polarizing film, an inner protective film, a pressure-sensitive adhesive layer, and an outer protective film are laminated.
  • the polarizer is attached to the zoom liquid crystal element 34 at an angle.
  • the polarizing plate is not disposed at an angle on the zoom liquid crystal element 34, and the angle is designed according to the actual needs of the polarizing plate to polarize the light to the polarization angle required for the liquid crystal lens to work. can.
  • a filter element 33 for filtering ambient light is further disposed between the photosensitive device and the optical lens. Further, the zoom liquid crystal element 34 and the filter element 33 are all engaged in a frame 3. Specifically, the frame 3 is provided with a first card slot 31 and a second card slot 32. The zoom liquid crystal element 34 and the polarizing element 35 are clamped in the first card slot 31, and the filter element 33 is clamped in the second card slot 32. Inside.
  • the filter element 33 can also be connected to the zoom liquid crystal element 34 by bonding or other conventional techniques.
  • the filter element 33 is preferably provided as an infrared filter. The infrared filter filters out the ambient light and only passes the infrared light of a certain band to avoid the occurrence of impurities in the shooting, thus ensuring the quality of the picture.
  • the optical lens 1 includes a base 11 that cooperates with the circuit control board 5, and the zoom liquid crystal element 34 can be connected to the base 11 through a support frame 7 provided. It is convenient to securely connect the zoom liquid crystal element 34 to further ensure the effect of optical zooming. Specifically, after the zoom liquid crystal element 34 in the embodiment is engaged in the frame 3, the frame 3 is connected to the base 11 through the support frame 7. In addition, the base 11 can also be connected to the camera bezel 6 for easy connection.
  • the photosensitive device 4 is generally set as an image sensor. Further, in the present embodiment, the pitch of the monomer liquid crystal lens and the photosensitive device 4 is preferably set to 5 mm. It should be noted that the zoom liquid crystal element 34 and the photosensitive The pitch of the device 4 can also be set to any other value according to actual needs. Preferably, the pitch of the unitary liquid crystal lens and the photosensitive device 4 is set to 5 mm, and the optical lens 1 is preferably a 12.5 mm focal length lens. It should be noted that when the single liquid crystal lens is not charged, it is equivalent to a piece of glass, and the focal length of the liquid crystal lens of the unit is positive, that is, the focal length of the entire optical imaging system is still 12.5 mm.
  • the liquid crystal layer of the single liquid crystal lens can be twisted, and the focal length of the single liquid crystal lens changes, and the focal length of the entire optical imaging system changes accordingly.
  • the focus of the optical lens can be adjusted to further enable the image sensor to record clear and sharp images.
  • the infrared light source 2 includes an infrared light source PCB board, and the infrared light source PCB board is provided with a plurality of spaced-apart lamp beads 21.
  • the light emitted from the infrared light source is reflected into the camera through the reflective ball, and since the reflective ball has a high reflectivity to the light path, it further helps to avoid the occurrence of impurities in the shooting, thereby ensuring shooting. Picture quality.
  • the PCB Printed Circuit Board
  • the Chinese name is a printed circuit board, also known as a printed circuit board, which is a support for electronic components and a carrier for electrical connection of electronic components.
  • the driving device includes a power source and a voltage driving element for converting the power source into a driving voltage to drive the liquid crystal layer of the zoom liquid crystal element 34 to be twisted.
  • the driving device can adopt the conventional conventional technology.
  • a boost driving circuit can also be used to generate a driving voltage in accordance with an input voltage to drive the liquid crystal layer of the zoom liquid crystal element 34 to be twisted.
  • the driving device in this embodiment is preferably disposed on the circuit board 5 to facilitate control of the driving voltage to drive the liquid crystal layer of the zoom liquid crystal element 34 to be twisted.
  • the circuit control board 5, the photosensitive device 4 and the zoom liquid crystal element 34 are all placed in a camera outer frame 6, and the camera outer frame 6 is connected with the optical lens 1 to better protect the circuit control board 5 and the photosensitive Device 4 and zoom liquid crystal element 34.
  • the camera bezel 6 is screwed to the optical lens 1 to facilitate mounting and detaching the camera bezel 6 and the optical lens 1.
  • a connecting rod 8 for connecting the camera frame 6 and the infrared light source 2 may be disposed between the camera frame 6 and the infrared light source 2, and the connecting frame 8 facilitates connecting the camera frame 6 with the infrared light source 2, and is helpful.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Studio Devices (AREA)
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Abstract

一种可实现光学变焦的光学动捕摄像机，包括光学镜头(1)；置于光学镜头(1)的一侧的红外光源(2)；置于光学镜头(1)的另一侧且与光学镜头(1)对应的感光器件(4)；与感光器件(4)电性连接的电路控制板(5)；设于感光器件(4)与光学镜头(1)之间且用于改变光学成像系统的焦距的变焦液晶元件(34)以及与变焦液晶元件(34)电性配合且用于驱动变焦液晶元件(34)的液晶层发生扭转的驱动装置。该可实现光学变焦的光学动捕摄像机，在变焦时可变范围不受镜头的限制，变焦时变焦液晶元件(34)的外部结构不会发生改变，仅仅是液晶层的旋转，因此，焦距可变范围大，且成像质量好。

Description

可实现光学变焦的光学动捕摄像机
技术领域
[0001] 本发明属于摄像机的技术领域， 特别涉及一种可实现光学变焦的光学动捕摄像 机。
背景技术
[0002] 光学动作捕捉系统被广泛应用于电影动画特技制作、 大型游戏制作、 生命科学 研究等领域。 近年来随着 VR (Virtual Reality, 即虚拟现实） 技术的发展， 光学 动作捕抓系统幵始被应用于 VR领域。 光学动作捕捉系统的核心器件是光学动补 摄像机。 该摄像机主要由图像传感器、 镜头、 红外带通滤光单元、 红外光源以 及摄像机控制电路组成。 红外带通滤光单元用于过滤掉环境光， 只通过一定波 段的红外光。 红外光源发出的光照射到被捕捉物 （人和动物等） 上， 被绑定在 被捕捉物上的反光球反射， 反射光通过镜头、 红外带通滤光单元， 最后被图像 传感器记录。
[0003] 光学动捕摄像机的用途广泛， 因此， 使用场地、 情景也各异。 目前的光学动捕 摄像机通常存在如下技术问题： 有吋候希望摄像机有更广的视野， 有吋候希望 摄像机有更远的视野， 而两者不能同吋兼得。 传统的方法是在光学动捕摄像机 上使用变焦镜头来实现光学变焦， 即可在需要更广视野的吋候调小焦距使摄像 机视野更广， 需要更远视野的吋候调大焦距使摄像机能捕捉到更远的地方。
[0004] 然而， 传统的可实现光学变焦的光学动捕摄像机通过变焦镜头来实现光学变焦 的方法存在以下技术问题： 一是焦距可变范围非常小。 变焦镜头在变焦过程中 由于内部镜片组需要协同移动， 镜头会呈现一定程度的伸缩。 而又由于光学动 捕摄像机照明方向性的要求， 镜头是与摄像机光源的位置是相对固定的， 即光 源环绕镜头设置。 当变焦镜头往里缩的吋候， 镜头的部分视场有可能会被光源 挡住； 而当变焦镜头往外伸的吋候， 部分光源光线的照明路径有可能会被镜头 伸出来的部分挡住， 因此， 使得焦距的可变范围受到镜头伸缩的限制。 二是变 焦镜头由于需要兼顾各个焦段的成像能力， 其相差处理畸变处理远远不如定焦 镜头， 综合的成像能力比定焦镜头差， 从而影响动捕摄像机的捕捉准确性。 技术问题
[0005] 本发明的主要目的在于提供一种可实现光学变焦的光学动捕摄像机， 旨在解决 传统的可实现光学变焦的光学动捕摄像机存在的焦距可变范围小以及成像质量 差的问题。
问题的解决方案
技术解决方案
[0006] 本发明是这样实现的， 一种可实现光学变焦的光学动捕摄像机， 包括：
[0007] 光学镜头；
[0008] 置于所述光学镜头的一侧的红外光源；
[0009] 置于所述光学镜头的另一侧且与所述光学镜头对应的感光器件；
[0010] 与所述感光器件电性连接的电路控制板；
[0011] 设于所述感光器件与所述光学镜头之间且用于改变光学成像系统的焦距的变焦 液晶元件以及与所述变焦液晶元件电性配合且用于驱动所述变焦液晶元件的液 晶层发生扭转的驱动装置。
[0012] 作为本发明的优选技术方案：
[0013] 进一步地， 所述变焦液晶元件设为呈薄片状的单体液晶透镜。 进一步地， 所述 光学镜头与所述变焦液晶元件之间设有用于将光起偏到与所述变焦液晶元件的 工作状态相匹配的偏振元件。
[0014] 进一步地， 所述偏振元件呈薄片状， 薄片状的所述偏振元件呈角度地设置在所 述变焦液晶元件上。
[0015] 进一步地， 所述感光器件与所述光学镜头之间还设有用于过滤环境光的滤光元 件。
[0016] 进一步地， 所述滤光元件设为红外滤光片。
[0017] 进一步地， 所述变焦液晶元件和所述滤光元件均卡接于一框体内。
[0018] 进一步地， 所述光学镜头包括与所述电路控制板相互配合的底座， 所述变焦液 晶元件通过设置的一支撑架与所述底座相连。
[0019] 进一步地， 所述红外光源包括红外光源 PCB板， 所述红外光源 PCB板上设有多 个间隔分布的灯珠。
[0020] 进一步地， 所述驱动装置包括电源以及用于将所述电源转换成驱动电压以驱动 所述变焦液晶元件的液晶层发生扭转的电压驱动元件。
[0021] 进一步地， 所述驱动装置设置在所述电路控制板上。
[0022] 进一步地， 所述电路控制板、 所述感光器件和所述变焦液晶元件均置于一摄像 机外框中， 所述摄像机外框与所述光学镜头相连。
[0023] 进一步地， 所述摄像机外框与所述光学镜头旋接。
[0024] 进一步地， 所述摄像机外框与所述红外光源之间设有用于连接所述摄像机外框 与所述红外光源的连接杆。
发明的有益效果
有益效果
[0025] 本发明提供的可实现光学变焦的光学动捕摄像机， 在使用可实现光学变焦的光 学动捕摄像机吋， 通过在感光器件与光学镜头之间设置的变焦液晶元件以及其 与驱动装置的电性配合的作用下， 驱动装置利用电场改变了变焦液晶元件的液 晶的旋转方向， 即驱动变焦液晶元件的液晶层发生扭转， 通过改变变焦液晶元 件的焦距， 来达到聚焦点的转换， 以使得整个光学成像系统的焦距改变。 与现 有技术相比， 变焦吋可变范围不受镜头的限制， 即变焦吋变焦液晶元件的外部 结构不会发生改变， 仅仅是液晶层的旋转， 因此， 焦距可变范围大， 且成像质 量好。
对附图的简要说明
附图说明
[0026] 图 1是本发明实施例提供的可实现光学变焦的光学动捕摄像机的内部结构示意 图；
[0027] 图 2是本发明实施例提供的可实现光学变焦的光学动捕摄像机的剖面图；
[0028] 图 3是本发明实施例提供的可实现光学变焦的光学动捕摄像机的框体部位的结 构示意图。
[0029] 图中： 1-光学镜头， 11-底座， 2-红外光源， 21-灯珠， 3-框体， 31-第一卡槽， 3 2-第二卡槽， 33-滤光元件， 34-变焦液晶元件， 35-偏振元件， 4-感光器件， 5-电 路控制板， 6-摄像机外框， 7-支撑架， 8-连接杆。
本发明的实施方式
[0030] 为了使本发明的目的、 技术方案及优点更加清楚明白， 以下结合附图及实施例 ， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体实施例仅用以 解释本发明， 并不用于限定本发明。
[0031] 需要说明的是， 当元件被称为 "固定于"或"设置于"另一个元件， 它可以直接在 另一个元件上或者间接在该另一个元件上。 当一个元件被称为"连接于 "另一个元 件， 它可以是直接连接到另一个元件或间接连接至该另一个元件。
[0032] 本发明提供一种可实现光学变焦的光学动捕摄像机， 通过在感光器件 4与光学 镜头 1之间设置的变焦液晶元件 34以及其与驱动装置的电性配合的作用下， 通过 改变变焦液晶元件 34的焦距， 来达到聚焦点的转换， 因此， 焦距可变范围大， 且成像质量好。
[0033] 请参阅附图 1〜图 3， 该可实现光学变焦的光学动捕摄像机包括光学镜头 1、 置于 光学镜头 1的一侧的红外光源 2、 置于光学镜头 1的另一侧且与光学镜头 1对应的 感光器件 4、 与感光器件 4电性连接的电路控制板 5、 设于感光器件 4与光学镜头 1 之间且用于改变光学成像系统的焦距的 3以及与变焦液晶元件 34电性配合且用于 驱动变焦液晶元件 34的液晶层发生扭转的驱动装置。
[0034] 本发明实施例提供的可实现光学变焦的光学动捕摄像机， 在使用可实现光学变 焦的光学动捕摄像机吋， 通过在感光器件 4与光学镜头 1之间设置的变焦液晶元 件 34以及其与驱动装置的电性配合的作用下， 驱动装置利用电场改变了变焦液 晶元件 34的液晶的旋转方向， 即驱动变焦液晶元件 34的液晶层发生扭转， 通过 改变变焦液晶元件 34的焦距， 来达到聚焦点的转换， 以使得整个光学成像系统 的焦距改变。 与现有技术相比， 变焦吋可变范围不受镜头的限制， 即变焦吋变 焦液晶元件 34的外部结构不会发生改变， 仅仅是液晶层的旋转， 因此， 焦距可 变范围大， 且成像质量好。
[0035] 优选地， 变焦液晶元件 34设为呈薄片状的单体液晶透镜， 在使用的吋候， 便于 通过改变单体液晶透镜自身的焦距来实现变焦。 具体地， 通过单体液晶透镜改 变反射回的光的光路。 需说明的是， 单体液晶透镜可以采用现有常规技术。 进 一步地， 单体液晶透镜设置为横截面呈矩形状的结构， 以使得液晶透镜稳定度 高， 以及增加电场对单体液晶透镜的影响能力。
[0036] 进一步地， 光学镜头 1与变焦液晶元件 34之间设有用于将光起偏到与变焦液晶 元件 34的工作状态相匹配的偏振元件 35， 具体地， 偏振元件 35呈薄片状， 薄片 状的所述偏振元件 35呈角度地设置在所述变焦液晶元件 34上。 需说明的是， 本 实施例中偏振元件 35设为偏振片， 偏振片可以采用现有常规技术， 偏振片是可 以使天然光变成偏振光的光学元件。 偏振片对入射光具有遮蔽和透过的功能， 可使纵向光或横向光一种透过， 一种遮蔽。 现有技术的偏振片是由偏振膜、 内 保护膜、 压敏胶层及外保护膜层压而成的复合材料。 优选地， 为了便于将偏振 片与变焦液晶元件 34连接， 且使得偏振片能将光起偏到配合变焦液晶元件 34所 需的偏振角度， 偏振片呈角度地粘贴在变焦液晶元件 34上。 需说明的是， 图中 未体现出偏振片呈角度设置在变焦液晶元件 34上， 该角度根据偏振片能将光起 偏到能配合液晶透镜工作所需的偏振角度吋的实际需要进行设计即可。
[0037] 此外， 感光器件与光学镜头之间还设有用于过滤环境光的滤光元件 33。 进一步 地， 变焦液晶元件 34和滤光元件 33均卡接于一框体 3内。 具体地， 框体 3设有第 一卡槽 31和第二卡槽 32， 变焦液晶元件 34和偏振元件 35卡紧在第一卡槽 31内， 滤光元件 33卡紧在第二卡槽 32内。 此外， 需说明的是， 滤光元件 33还可以采用 粘接或现有其他常规技术手段与变焦液晶元件 34进行连接。 滤光元件 33优选设 置为红外滤光片。 红外滤光片过滤掉环境光， 只通过一定波段的红外光， 避免 拍摄吋出现杂质， 从而保证拍摄画面质量。
[0038] 具体地， 光学镜头 1包括与电路控制板 5相互配合的底座 11， 变焦液晶元件 34可 以通过设置的一支撑架 7与底座 11相连。 便于将变焦液晶元件 34的稳固连接， 进 一步保证光学变焦的效果。 具体地， 本实施例中的变焦液晶元件 34卡接在框体 3 内后， 再将框体 3通过支撑架 7与底座 11相连。 此外， 为了便于连接， 底座 11还 可以与摄像机外框 6相连。
[0039] 需说明的是， 感光器件 4通常设为图像传感器。 此外， 本实施例中将单体液晶 透镜与感光器件 4的间距优选设置为 5mm。 需说明的是， 变焦液晶元件 34与感光 器件 4的间距还可以根据实际需要设为其他任意值。 优选地， 单体液晶透镜与感 光器件 4的间距设置为 5mm吋， 光学镜头 1优选采用 12.5mm焦距镜头。 需说明的 是， 当单体液晶透镜不加电吋， 其相当于一块玻璃片， 此吋单体液晶透镜焦距 为正无穷， 即整个光学成像系统的焦距依然是 12.5mm。 当我们加上一个驱动电 压， 单体液晶透镜液晶层可发生扭转， 单体液晶透镜焦距改变， 此吋整个光学 成像系统的焦距也随之改变。 此外， 需说明的是， 在变焦之后还可调节一下光 学镜头的对焦， 进一步使图像传感器能记录清晰明锐的画面。
[0040] 具体地， 红外光源 2包括红外光源 PCB板， 红外光源 PCB板上设有多个间隔分 布的灯珠 21。 具体地， 在拍摄的吋候， 从红外光源发出的光线通过反光小球反 射进入摄像机， 由于反光小球对光线的原路反射率较高， 进一步有助于避免拍 摄吋出现杂质， 进而保证拍摄的画面质量。 需说明的是， PCB ( Printed Circuit Board) ， 中文名称为印制电路板， 又称印刷线路板， 它是是电子元器件的支撑 体， 是电子元器件电气连接的载体。
[0041] 具体地， 驱动装置包括电源以及用于将电源转换成驱动电压以驱动变焦液晶元 件 34的液晶层发生扭转的电压驱动元件。 需说明的是， 驱动装置可以采用现有 常规技术。 一般来说， 也可以使用升压驱动电路， 以根据输入电压产生驱动电 压来驱动变焦液晶元件 34的液晶层发生扭转。 本实施例中驱动装置优选设置在 电路控制板 5上， 便于控制驱动电压以驱动变焦液晶元件 34的液晶层发生扭转。
[0042] 进一步地， 电路控制板 5、 感光器件 4和变焦液晶元件 34均置于一摄像机外框 6 中， 摄像机外框 6与光学镜头 1相连， 以更好地保护电路控制板 5、 感光器件 4和 变焦液晶元件 34。 具体地， 摄像机外框 6与光学镜头 1旋接， 以便于将摄像机外 框 6与光学镜头 1安装和拆卸。 此外， 摄像机外框 6与红外光源 2之间还可以设置 用于连接摄像机外框 6与红外光源 2的连接杆 8， 通过连接杆 8便于将摄像机外框 6 与红外光源 2连接， 且有助于保护光学镜头 1。
[0043] 以上仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发明的精 神和原则之内所作的任何修改、 等同替换或改进等， 均应包含在本发明的保护 范围之内。

Claims

权利要求书
一种可实现光学变焦的光学动捕摄像机， 其特征在于， 包括： 光学镜头；
置于所述光学镜头的一侧的红外光源；
置于所述光学镜头的另一侧且与所述光学镜头对应的感光器件； 与所述感光器件电性连接的电路控制板；
设于所述感光器件与所述光学镜头之间且用于改变光学成像系统的焦 距的变焦液晶元件以及与所述变焦液晶元件电性配合且用于驱动所述 变焦液晶元件的液晶层发生扭转的驱动装置。
如权利要求 1所述的可实现光学变焦的光学动捕摄像机， 其特征在于
， 所述变焦液晶元件设为呈薄片状的单体液晶透镜。
如权利要求 1所述的可实现光学变焦的光学动捕摄像机， 其特征在于
， 所述光学镜头与所述变焦液晶元件之间设有用于将光起偏到与所述 变焦液晶元件的工作状态相匹配的偏振元件。
如权利要求 3所述的可实现光学变焦的光学动捕摄像机， 其特征在于 ， 所述偏振元件呈薄片状， 薄片状的所述偏振元件呈角度地设置在所 述变焦液晶元件上。
如权利要求 1~4任一项所述的可实现光学变焦的光学动捕摄像机， 其 特征在于， 所述感光器件与所述光学镜头之间还设有用于过滤环境光 的滤光元件。
如权利要求 5所述的可实现光学变焦的光学动捕摄像机， 其特征在于 ， 所述滤光元件设为红外滤光片。
如权利要求 6所述的可实现光学变焦的光学动捕摄像机， 其特征在于
， 所述变焦液晶元件和所述滤光元件均卡接于一框体内。
如权利要求 1~4任一项所述的可实现光学变焦的光学动捕摄像机， 其 特征在于， 所述光学镜头包括与所述电路控制板相互配合的底座， 所 述变焦液晶元件通过设置的一支撑架与所述底座相连。
如权利要求 1~4任一项所述的可实现光学变焦的光学动捕摄像机， 其 特征在于， 所述红外光源包括红外光源 PCB板， 所述红外光源 PCB板 上设有多个间隔分布的灯珠。
[权利要求 10] 如权利要求 1~4任一项所述的可实现光学变焦的光学动捕摄像机， 其 特征在于， 所述驱动装置包括电源以及用于将所述电源转换成驱动电 压以驱动所述变焦液晶元件的液晶层发生扭转的电压驱动元件。
[权利要求 11] 如权利要求 10所述的可实现光学变焦的光学动捕摄像机， 其特征在于
， 所述驱动装置设置在所述电路控制板上。
[权利要求 12] 如权利要求 1~4任一项所述的可实现光学变焦的光学动捕摄像机， 其 特征在于， 所述电路控制板、 所述感光器件和所述变焦液晶元件均置 于一摄像机外框中， 所述摄像机外框与所述光学镜头相连。
[权利要求 13] 如权利要求 12所述的可实现光学变焦的光学动捕摄像机， 其特征在于
， 所述摄像机外框与所述光学镜头旋接。
[权利要求 14] 如权利要求 12所述的可实现光学变焦的光学动捕摄像机， 其特征在于
， 所述摄像机外框与所述红外光源之间设有用于连接所述摄像机外框 与所述红外光源的连接杆。
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