WO2017193508A1 - 后焦调节机构及具有其的摄像机 - Google Patents

后焦调节机构及具有其的摄像机 Download PDF

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Publication number
WO2017193508A1
WO2017193508A1 PCT/CN2016/097536 CN2016097536W WO2017193508A1 WO 2017193508 A1 WO2017193508 A1 WO 2017193508A1 CN 2016097536 W CN2016097536 W CN 2016097536W WO 2017193508 A1 WO2017193508 A1 WO 2017193508A1
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WO
WIPO (PCT)
Prior art keywords
back focus
focus adjustment
adjustment mechanism
assembly
drive
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PCT/CN2016/097536
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English (en)
French (fr)
Inventor
谢清伟
Original Assignee
杭州海康威视数字技术股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 杭州海康威视数字技术股份有限公司 filed Critical 杭州海康威视数字技术股份有限公司
Priority to US16/098,300 priority Critical patent/US10739606B2/en
Priority to PL16901463.6T priority patent/PL3457207T3/pl
Priority to KR1020187034115A priority patent/KR102125089B1/ko
Priority to EP16901463.6A priority patent/EP3457207B1/en
Publication of WO2017193508A1 publication Critical patent/WO2017193508A1/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
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/04—Focusing arrangements of general interest for cameras, projectors or printers adjusting position of image plane without moving lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/40—Optical focusing aids
    • 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
    • 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
    • G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
    • 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
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing
    • 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
    • H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
    • 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
    • H04N23/60—Control of cameras or camera modules
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/67—Focus control based on electronic image sensor signals
    • H04N23/676—Bracketing for image capture at varying focusing conditions

Definitions

  • the present application relates to the technical field of a focus adjustment device, and in particular to a back focus adjustment mechanism and a camera having the same.
  • the camera's back focus adjustment mechanism is used to adjust the relative position between the lens and the image sensor so that the distance between the focus of the lens and the image sensor reaches the theoretical requirement, so that the camera is clearly imaged.
  • the Z-axis of the existing back focus adjustment mechanism is positioned by bolts or screws, and the Z-axis refers to a line that passes through the focus of the lens and is perpendicular to the imaging plane of the image sensor.
  • the driving and positioning of the existing back focus adjustment mechanism are integrally provided, so that the accuracy of the parts is too high, or the coaxial accuracy of the Z-axis of the back focus adjustment mechanism is lowered.
  • the main object of the present application is to provide a back focus adjustment mechanism and a camera having the same, which solves the problem of high precision requirements of parts in the back focus adjustment mechanism in the prior art.
  • a back focus adjustment mechanism including a separately disposed driving device and a positioning guide, wherein the positioning guide includes a positioning assembly and a guiding assembly, and the guiding assembly is mounted in the positioning On the assembly, the drive unit is drivingly coupled to the guide assembly to drive the guide assembly to move.
  • the positioning assembly comprises a mounting plate, the mounting plate is provided with a guiding hole, the guiding assembly comprises: a guiding bearing, the guiding bearing is mounted on the first side of the mounting plate and communicates with the guiding hole; the image sensor fixing plate, the image sensor fixing plate a second side opposite to the first side of the mounting plate; a guiding shaft fixedly disposed on the image sensor fixing plate and passing through the guiding hole through the guiding bearing.
  • the driving device drives the guiding direction to move away from the mounting plate, and the rear focus adjusting machine
  • the structure further includes a reset mechanism for resetting the guide shaft.
  • the image sensor fixing plate is fixedly provided with a plurality of mounting posts, and the plurality of mounting posts are disposed around the outer circumference of the guiding shaft, and the mounting posts are disposed from the second side of the mounting plate to the first side of the mounting plate, and the reset mechanism
  • the utility model comprises: an elastic returning member, the elastic returning member is sleeved on the mounting post; the stopping component, the stopping component is detachably arranged at an end of the mounting post remote from the mounting plate, and the two ends of the elastic returning piece respectively abut the stop Components and mounting plate.
  • the stop assembly includes a bolt and a washer
  • the elastic return member is a spring or an elastic rubber cylinder.
  • the driving device comprises: a driving motor; a driving stud, the driving stud is driven to rotate under the driving of the driving motor; a driving nut, the driving nut is sleeved on the driving stud, and driving the guiding axial direction under the driving of the driving stud Move away from the mounting plate.
  • the back focus adjusting mechanism further comprises a limiting bracket, the limiting bracket is provided with a retaining hole, the driving stud is disposed in the retaining hole, and the driving nut is located on a side of the limiting bracket close to the guiding shaft.
  • the limiting bracket comprises two limiting plates, a plurality of supporting columns are arranged between the two limiting plates, a positioning block is arranged on the driving nut, the supporting column is disposed on the positioning block, and the driving nut is located in the plurality of roots
  • the support column encloses a space formed.
  • first block of the two limiting plates is provided with a retaining hole
  • second block of the two limiting plates is provided with a through hole
  • the end of the driving nut passes through the through hole to drive with the guiding shaft connection.
  • the driving device further includes a reduction gear set, the reduction gear set is drivingly connected with the driving motor, and the driving nut is drivingly connected with the reduction gear set.
  • the limiting bracket is provided with a photoelectric switch for sensing the moving position of the driving nut, and a cable for transmitting the moving position of the driving nut to the camera control device.
  • a camera including a lens, an image sensor, and a back focus adjustment mechanism for adjusting a focus between the focus of the lens and an imaging plane of the image sensor
  • the vertical distance, the back focus adjustment mechanism is the above-mentioned back focus adjustment mechanism
  • the lens is disposed on the guide assembly of the back focus adjustment mechanism
  • the image sensor is disposed on the positioning assembly of the back focus adjustment mechanism.
  • the driving device and the positioning guiding device in the present application are separately arranged, the requirements for assembling components are greatly reduced during the assembly process, and the driving is also ensured.
  • the drive stability of the device to the guide assembly That is to say, after the driving device and the positioning guiding device are separately arranged, the respective structures of the back focus adjusting mechanism in the present application can be made simpler, and the respective structures in the back focus adjusting mechanism are increased under the processing precision of the same precision. Reliability.
  • FIG. 1 is a view schematically showing a first perspective structural view of a back focus adjusting mechanism of the present application
  • FIG. 2 is a schematic perspective view showing a second perspective structure of the back focus adjusting mechanism of the present application
  • Figure 3 is a schematic front view of the back focus adjustment mechanism of the present application.
  • Figure 4 is a schematic cross-sectional view showing the back focus adjustment mechanism of the present application.
  • Fig. 5 schematically shows an exploded view of the back focus adjustment mechanism of the present application.
  • the Z-axis described herein refers to a straight line that passes through the focus of the lens and is perpendicular to the imaging plane of the image sensor.
  • a back focus adjustment mechanism is provided.
  • the back focus adjustment mechanism in this embodiment includes a separately disposed driving device 10 and a positioning guide 20, wherein the positioning guide 20 includes a positioning assembly 21 and a guiding assembly 22, and the guiding assembly 22 is mounted on the positioning assembly 21, the driving device 10 is drivingly coupled to the guide assembly 22 to drive the guide assembly 22 Moving relative to the positioning assembly 21 along the Z-axis, wherein the positioning assembly 21 is used to secure the image sensor of the camera, and the guiding assembly 22 is used to secure the lens of the camera.
  • the image sensor of the camera can be fixedly mounted on the guide assembly 22, and the lens of the camera is fixedly mounted on the positioning assembly 21, and driven by the driving device 10, the guide assembly 22 is driven.
  • the upper image sensor moves along the Z axis with respect to the lens mounted on the positioning assembly 21, thereby implementing the back focus adjustment of the camera.
  • the driving device 10 and the positioning guide 20 in this embodiment are separately provided, the requirements for assembling components are greatly reduced during the assembly process, and the driving stability of the driving device 10 to the guiding assembly 22 is also facilitated. That is to say, after the driving device 10 and the positioning guiding device 20 are separately disposed, the structure of the back focus adjusting mechanism in the embodiment can be made simpler, and the processing accuracy of the same precision is increased in the back focus adjusting mechanism. The reliability of each structure.
  • the positioning assembly 21 in this embodiment includes a mounting plate 211, and the lens is mounted on the mounting plate 211.
  • the guide assembly 22 includes a guide bearing 221, an image sensor fixing plate 222, and a guide shaft 223, and the image sensor is mounted to the image sensor fixing plate 222.
  • the mounting plate 211 in this embodiment is provided with a guide hole 2111.
  • the guide bearing 221 is mounted on the first side of the mounting plate 211, and the bearing hole on the guide bearing 221 is communicated with the guide hole 2111; then the image sensor fixing plate 222 is mounted on the mounting plate 211 The second side opposite to one side; finally, the guide shaft 223 is fixedly disposed on the image sensor fixing plate 222, and the guide shaft 223 is bored from the guide hole 2111 in the guide bearing 221.
  • the image sensor is mounted on the image sensor fixing plate 222, the lens is mounted on the mounting plate 211, and the driving shaft 10 is driven by the driving device 10 to reciprocate along the Z axis in the guiding hole 2111, and then the camera is subjected to back focus adjustment.
  • the driving device 10 drives the guiding shaft 223 to move away from the mounting plate 211 to drive the guiding shaft 223 to move toward the lens.
  • the guiding shaft 223 is directed toward the image sensor. Movement, the back focus adjustment mechanism in this embodiment includes a reset mechanism 30.
  • the reset mechanism 30 in this embodiment includes a resilient return member 31 and a stop assembly 32.
  • the image transmission in this embodiment A plurality of mounting posts 2221 are fixedly disposed on the sensor fixing plate 222.
  • the plurality of mounting posts 2221 are disposed on the outer circumference of the guiding shaft 223 and are disposed from the second side of the mounting plate 211 to the first side of the mounting plate 211. .
  • the elastic return member 31 When the reset mechanism 30 is installed, the elastic return member 31 is sleeved on the mounting post 2221; the stop assembly 32 is detachably disposed at the end of the mounting post 2221 away from the mounting plate 211, and the two ends of the elastic return member 31 are respectively It abuts on the stop assembly 32 and the mounting plate 211.
  • the guide shaft 223 and the guide bearing 221 in this embodiment have a high-precision clearance fit for easy driving.
  • the stop assembly 32 in the embodiment includes a bolt 321 and a gasket 322.
  • the bolt 321 is screwed to the mounting post 2221, the gasket 322 is sleeved on the rod portion of the bolt 321 , and the elastic return member 31 is sleeved on the mounting post 2221 . And under the action of its own elastic force, it is pressed between the gasket 322 and the mounting plate 211.
  • the stop assembly 32 can also be configured as a stop block or the like.
  • the elastic returning member 31 in the present embodiment may be provided as a spring, and may also be provided as a structure such as an elastic rubber cylinder.
  • the drive unit 10 of the present embodiment includes a drive motor 11, a drive stud 12, and a drive nut 13.
  • the driving stud 12 is rotated by the driving motor 11; the driving nut 13 is sleeved on the driving stud 12, and the driving shaft 223 is driven to move away from the mounting plate 211 under the driving of the driving stud 12.
  • the drive motor 11 can convert its circumferential rotation into the movement of the drive nut 13 along the length of the drive stud 12, and then drive the guide shaft 223 to move by the drive nut 13.
  • the coaxial feeding of the screw pair formed by the driving stud and the driving nut and the coaxial positioning of the guiding shaft 223 are separated, which can make the adjustment precision of the same precision processing higher, or reduce the processing of the parts. Precision requirements. It can be seen that after the driving device 10 and the positioning guiding device 20 are separated, the structure of the back focus adjusting mechanism in the embodiment is simpler, and the processing precision of the same precision is increased. The reliability of each structure in the back focus adjustment mechanism is added.
  • the back focus adjustment mechanism of the present embodiment further includes a limit bracket 40 to define the rotational freedom of the drive nut 13 relative to the drive stud 12 and the displacement along the axial direction of the drive stud 12
  • the axial direction of the drive stud 12 described herein coincides with the Z-axis.
  • the limiting bracket 40 is provided with a retaining hole 411. During installation, one end of the driving stud 12 away from the driving motor 11 is inserted in the retaining hole 411, and the driving nut 13 is mounted on the limiting bracket 40. One side of the guide shaft 223, in turn, limits the drive nut 13.
  • the limiting bracket 40 in the embodiment includes two limiting plates 41.
  • a plurality of supporting columns 42 are disposed between the two limiting plates 41, and a plurality of supporting columns 42 are enclosed to form an installation space.
  • the drive nut 13 is located in the installation space, and the structure is stable and reliable.
  • the first block of the two limiting plates 41 is provided with the above-mentioned retaining hole 411 for the driving stud 12 to pass through, and the second block of the two limiting plates 41 is provided with a through hole 412, and the second The block limiting block is fixedly connected to the guide bearing 221 by bolts, so that the driving stud 12 drives the driving nut 13 to reciprocate up and down along the supporting column 42 between the two limiting plates 41, and then the driving nut 13 pushes the image sensor fixing plate 222.
  • the elastic force against the elastic returning member 31 is moved downward relative to the mounting plate 211. That is, during the operation, the end of the drive nut 13 passes through the through hole 412 to contact the guide shaft 223 to drive the guide shaft 223 to move.
  • the driving nut 13 in the present embodiment is provided with a positioning block 131.
  • the supporting column 42 is passed through the positioning block 131 to position the driving nut 13 and guide.
  • the limiting plate 41 provided with the through hole 412 and the guiding bearing 221 may be fixedly connected together by a fastening structure such as a screw, and then the guiding bearing 221 is passed through.
  • the screw is fixed to the mounting plate 211.
  • the driving device 10 in this embodiment further includes a reduction gear set 14 that is drivingly coupled to the driving motor 11 and the driving stud 12 is drivingly coupled to the reduction gear set 14 through the action of the reduction gear set 14.
  • the rotation speed of the driving motor 11 is lowered, and the torque is amplified to facilitate the movement of the driving guide assembly 22.
  • the limit bracket 40 in this embodiment is provided with a photoelectric switch 50 and a cable.
  • the wire 60 by the action of the photoelectric switch 50, facilitates sensing the moving position of the drive nut 13 and transmits it to the camera control device (not shown) through the cable 60, thereby facilitating control of the drive unit 10.
  • a camera is provided.
  • the camera in this embodiment includes a lens, an image sensor, and a back focus adjustment mechanism; wherein the back focus adjustment mechanism is used to adjust the focus of the lens and the image sensor.
  • a vertical distance between the planes, the back focus adjustment mechanism is the above-mentioned back focus adjustment mechanism, the lens is disposed on the guide assembly 22 of the back focus adjustment mechanism, and the image sensor is disposed on the back focus adjustment mechanism Positioning component 21.
  • the utility model separates the helical pair coaxial feeding and the coaxial positioning, realizes higher adjustment precision of the same precision processing, or reduces the processing precision requirement of the parts.
  • the back focus adjustment mechanism is composed of a simpler structure, and the reliability of the structure is enhanced under the processing precision of the same precision.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

一种后焦调节机构及具有其的摄像机。后焦调节机构包括分体设置的驱动装置（10）和定位导向装置（20），其中，定位导向装置（20）包括定位组件（21）和导向组件（22），导向组件（22）安装在定位组件（21）上，驱动装置（10）与导向组件（22）驱动连接以驱动导向组件（22）运动。后焦调节机构及具有其的摄像机中将驱动装置（10）和定位导向装置（20）分体设置后，能够使得后焦调节机构的各个结构更加简单，同等精度的加工精度下增加了后焦调节机构中的各个结构的可靠性。

Description

后焦调节机构及具有其的摄像机
本申请要求于2016年05月09日提交中国专利局、申请号为201610303766.6，名称为“后焦调节机构及具有其的摄像机”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及焦距调节装置技术领域，具体而言，涉及一种后焦调节机构及具有其的摄像机。
背景技术
摄像机的后焦调节机构用于调节镜头和图像传感器之间的相对位置，以便镜头的焦点和图像传感器之间距离达到理论要求，从而使得摄像机成像清晰。
现有的后焦调节机构的Z轴依靠螺栓或螺钉定位，Z轴是指过镜头的焦点并垂直于图像传感器的成像平面的直线。现有后焦调节机构的驱动与定位是一体设置的，这样，导致零件精度要求太高，或导致后焦调节机构Z轴同轴精度降低。
申请内容
本申请的主要目的在于提供一种后焦调节机构及具有其的摄像机，以解决现有技术中的后焦调节机构中的零件精度要求高的问题。
为了实现上述目的，根据本申请的一个方面，提供了一种后焦调节机构，包括分体设置的驱动装置和定位导向装置，其中，定位导向装置包括定位组件和导向组件，导向组件安装在定位组件上，驱动装置与导向组件驱动连接以驱动导向组件运动。
进一步地，定位组件包括安装板，安装板上设置有导向孔，导向组件包括：导向轴承，导向轴承安装在安装板的第一侧，并与导向孔连通；图像传感器固定板，图像传感器固定板位于安装板的与第一侧相对的第二侧；导向轴，导向轴固定设置在图像传感器固定板上，并从导向孔穿设在导向轴承内。
进一步地，驱动装置驱动导向轴向远离安装板的方向运动，后焦调节机 构还包括复位机构，复位机构用于使导向轴复位。
进一步地，图像传感器固定板上固定设置有多根安装柱，多根安装柱围设在导向轴的外周，各安装柱从安装板的第二侧穿设至安装板的第一侧，复位机构包括：弹性复位件，弹性复位件套设在安装柱上；止挡组件，止挡组件可拆卸地设置在安装柱的远离安装板的端部，弹性复位件的两端分别抵接在止挡组件和安装板上。
进一步地，止挡组件包括螺栓和垫片，弹性复位件为弹簧或弹性橡胶筒。
进一步地，驱动装置包括：驱动电机；驱动螺柱，驱动螺柱在驱动电机的驱动下转动；驱动螺母，驱动螺母套设在驱动螺柱上，并在驱动螺柱的驱动下驱动导向轴向远离安装板的方向运动。
进一步地，后焦调节机构还包括限位支架，限位支架上设置有让位孔，驱动螺柱穿设在让位孔内，驱动螺母位于限位支架的靠近导向轴的一侧。
进一步地，限位支架包括两块限位板，两块限位板之间设置有多根支撑柱，驱动螺母上设置有定位块，支撑柱穿设在定位块上，且驱动螺母位于多根支撑柱围设形成的空间内。
进一步地，两块限位板中的第一块上设置有让位孔，两块限位板中的第二块上设置有通孔，驱动螺母的端部穿过通孔以与导向轴驱动连接。
进一步地，驱动装置还包括减速齿轮组，减速齿轮组与驱动电机驱动连接，驱动螺母与减速齿轮组驱动连接。
进一步地，限位支架上设置有光电开关和电缆线，所述光电开关用于感应所述驱动螺母的运动位置，所述电缆线用于将所述驱动螺母的运动位置传递给摄像机控制装置。
根据本申请的另一方面，提供了一种摄像机，包括镜头、图像传感器和后焦调节机构，所述后焦调节机构用于调节所述镜头的焦点和所述图像传感器的成像平面之间的垂直距离，后焦调节机构为上述的后焦调节机构，所述镜头设置于所述后焦调节机构的导向组件上，所述图像传感器设置于所述后焦调节机构的定位组件上。
应用本申请的技术方案，由于本申请中的驱动装置和定位导向装置是分体设置的，在装配的过程中，对装配零件的要求大大降低，还便于保证驱动 装置对导向组件的驱动稳定性。也就是说，本申请将驱动装置和定位导向装置分体设置后，能够使得本申请中的后焦调节机构的各个结构更加简单，同等精度的加工精度下增加了后焦调节机构中的各个结构的可靠性。
附图说明
构成本申请的一部分的说明书附图用来提供对本申请的进一步理解，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1示意性示出了本申请的后焦调节机构的第一立体结构图；
图2示意性示出了本申请的后焦调节机构的第二立体结构图；
图3示意性示出了本申请的后焦调节机构的主视图；
图4示意性示出了本申请的后焦调节机构的局部剖视图；以及
图5示意性示出了本申请的后焦调节机构的分解视图。
其中，上述附图包括以下附图标记：
10、驱动装置；11、驱动电机；12、驱动螺柱；13、驱动螺母；131、定位块；14、减速齿轮组；20、定位导向装置；21、定位组件；211、安装板；2111、导向孔；22、导向组件；221、导向轴承；222、图像传感器固定板；2221、安装柱；223、导向轴；30、复位机构；31、弹性复位件；32、止挡组件；321、螺栓；322、垫片；40、限位支架；41、限位板；411、让位孔；412、通孔；42、支撑柱；50、光电开关；60、电缆线。
具体实施方式
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本申请。
需要说明的是，本文所述及的Z轴是指过镜头的焦点并垂直于图像传感器的成像平面的直线。
参见图1至图5所示，根据本申请的实施例，提供了一种后焦调节机构。
本实施例中的后焦调节机构包括分体设置的驱动装置10和定位导向装置20，其中，定位导向装置20包括定位组件21和导向组件22，导向组件22安装在定位组件21上，驱动装置10与导向组件22驱动连接以驱动导向组件22 相对于定位组件21沿Z轴运动，其中，定位组件21用于固定摄像机的图像传感器，导向组件22用于固定摄像机的镜头，。使用本实施例的后焦调节机构时，可以将摄像机的图像传感器固定安装在导向组件22上，摄像机的镜头固定安装于定位组件21上，通过驱动装置10的驱动作用，带动安装在导向组件22上的图像传感器相对于安装在定位组件21的镜头沿Z轴移动，进而实现摄像机的后焦调节。
由于本实施例中的驱动装置10和定位导向装置20是分体设置的，在装配的过程中，对装配零件的要求大大降低，还便于保证驱动装置10对导向组件22的驱动稳定性。也就是说，本申请将驱动装置10和定位导向装置20分体设置后，能够使得本实施例中的后焦调节机构的各个结构更加简单，同等精度的加工精度下增加了后焦调节机构中的各个结构的可靠性。
本实施例中的定位组件21包括安装板211，镜头安装于安装板211。导向组件22包括导向轴承221、图像传感器固定板222以及导向轴223，图像传感器安装于图像传感器固定板222。
为了安装导向组件22，本实施例中的安装板211上设置有导向孔2111。安装导向组件22时，将导向轴承221安装在安装板211的第一侧，并使得导向轴承221上的轴承孔与导向孔2111连通；然后将图像传感器固定板222安装在安装板211的与第一侧相对的第二侧；最后将导向轴223固定设置在图像传感器固定板222上，并使得导向轴223从导向孔2111穿设在导向轴承221内。
使用时，将图像传感器安装在图像传感器固定板222上，镜头安装在安装板211上，并通过驱动装置10驱动导向轴223在导向孔2111内沿Z轴往复移动继而对摄像机进行后焦调节。
在实际驱动的过程中，驱动装置10驱动导向轴223向远离安装板211的方向运动进而驱动导向轴223向接近镜头方向运动，为了便于使导向轴223复位而使导向轴223向接近图像传感器方向运动，本实施例中的后焦调节机构包括复位机构30。
具体来说，本实施例中的复位机构30包括弹性复位件31和止挡组件32。为了安装复位机构30并保证导向轴223的复位稳定性，本实施例中的图像传 感器固定板222上固定设置有多根安装柱2221，上述的多根安装柱2221围设在导向轴223的外周，并从安装板211的第二侧穿设至安装板211的第一侧。
安装复位机构30时，将弹性复位件31套设在安装柱2221上；止挡组件32可拆卸地设置在安装柱2221的远离安装板211的端部，并使得弹性复位件31的两端分别抵接在止挡组件32和安装板211上。
这样，当需要驱动导向轴223向远离安装板211的方向运动时，只需要启动驱动装置10运动即可，在这个过程中，弹性复位件31被压缩，而当驱动装置10向图像传感器方向运动时，在弹性复位件31施加的弹力的作用下，使得导向轴223向靠近安装板211的方向运动，完成对导向轴223的往复调节，便于实现摄像机的后焦调节。
装配过程中，本实施例中的导向轴223与导向轴承221之间为高精度间隙配合，便于驱动。
优选地，在实施例中的止挡组件32包括螺栓321和垫片322，螺栓321与安装柱2221螺纹连接，垫片322套装于螺栓321的杆部，弹性复位件31套设于安装柱2221并在自身弹性力作用下压紧于垫片322和安装板211之间。在申请的其他实施例中，止挡组件32还可以设置成止挡块等结构。
优选地，本实施中的弹性复位件31可以设置为弹簧，还可以设置为弹性橡胶筒等结构。
再次参见图1至5所示，本实施例中的驱动装置10包括驱动电机11、驱动螺柱12以及驱动螺母13。
其中，驱动螺柱12在驱动电机11的驱动下转动；而驱动螺母13套设在驱动螺柱12上，并在驱动螺柱12的驱动下驱动导向轴223向远离安装板211的方向运动。这样，驱动电机11在工作的过程中，可以将其周向的转动转化为驱动螺母13沿驱动螺柱12的长度方向的运动，然后通过驱动螺母13驱动导向轴223运动。
也就是说，本实施例中将驱动螺柱和驱动螺母形成的螺旋副的同轴进给和导向轴223的同轴定位分离，能够使得同精度加工更高的调节精度，或降低零件的加工精度要求。可见，将驱动装置10和定位导向装置20分离后，使得本实施例中的后焦调节机构的结构更加简单，同等精度的加工精度下增 加了后焦调节机构中的各个结构的可靠性。
为了对驱动螺母13的行程进行控制，本实施中的后焦调节机构还包括限位支架40，以限定驱动螺母13相对于驱动螺柱12的转动自由度和沿驱动螺柱12轴向的位移量，本文述及的驱动螺柱12的轴向与Z轴重合。该限位支架40上设置有让位孔411，安装时，驱动螺柱12的远离驱动电机11的一端穿设在该让位孔411内，而将驱动螺母13安装在限位支架40的靠近导向轴223的一侧，进而对驱动螺母13进行限位。
结合图5所示，本实施例中的限位支架40包括两块限位板41，两块限位板41之间设置有多根支撑柱42，多根支撑柱42围设形成一个安装空间，驱动螺母13位于该安装空间内，结构稳定可靠。
两块限位板41中的第一块上设置有上述的供驱动螺柱12穿过的让位孔411，两块限位板41中的第二块上设置有通孔412，且第二块限位块通过螺栓固定连接于导向轴承221，以便驱动螺柱12驱动驱动螺母13沿支撑柱42在两个限位板41之间上下往复移动，继而使驱动螺母13推动图像传感器固定板222克服弹性复位件31的弹性力相对于安装板211向下移动。也就是说，工作的过程中，驱动螺母13的端部穿过通孔412以与导向轴223接触而驱动导向轴223运动。需要说明的是，本文在此涉及方位词上下是以图4为基准设定。
为了进一步提高驱动螺母13的安装稳定性和可靠性，本实施中的驱动螺母13上设置有定位块131，安装时，使支撑柱42穿设在定位块131上进而对驱动螺母13进行定位和导向。
为了保证整个后焦调节机构的稳定性，安装的过程中，可以将设置有通孔412的限位板41与导向轴承221通过螺钉等紧固结构固定连接在一起，然后再将导向轴承221通过螺钉与安装板211固定在一起。
优选地，本实施例中的驱动装置10还包括减速齿轮组14，该减速齿轮组14与驱动电机11驱动连接，而驱动螺柱12与减速齿轮组14驱动连接，通过减速齿轮组14的作用，将驱动电机11的转速降低，并将力矩放大，便于驱动导向组件22运动。
结合图5所示，本实施例中的限位支架40上设置有光电开关50和电缆 线60，通过光电开关50的作用，便于对驱动螺母13的运动位置进行感应，并通过电缆线60传递给摄像机控制装置(图中未示出)，进而便于对驱动装置10进行控制。
根据本申请的另一实施例，提供了一种摄像机，本实施例中的摄像机包括包括镜头、图像传感器和后焦调节机构；其中，后焦调节机构用于调节镜头的焦点和图像传感器的成像平面之间的垂直距离，该后焦调节机构为上述的后焦调节机构，所述镜头设置于所述后焦调节机构的导向组件22上，所述图像传感器设置于所述后焦调节机构的定位组件21上。
从以上的描述中，可以看出，本申请上述的实施例实现了如下技术效果：
本申请将螺旋副同轴进给和同轴定位分离，实现同精度加工更高的调节精度，或降低零件的加工精度要求。功能分离后，后焦调节机构由更简单的结构组成，同等精度的加工精度下增强了结构的可靠性。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (12)

  1. 一种后焦调节机构，其特征在于，包括分体设置的驱动装置(10)和定位导向装置(20)，其中，所述定位导向装置(20)包括定位组件(21)和导向组件(22)，所述导向组件(22)安装在所述定位组件(21)上，所述驱动装置(10)与所述导向组件(22)驱动连接以驱动所述导向组件(22)运动。
  2. 根据权利要求1所述的后焦调节机构，其特征在于，所述定位组件(21)包括安装板(211)，所述安装板(211)上设置有导向孔(2111)，所述导向组件(22)包括：
    导向轴承(221)，所述导向轴承(221)安装在所述安装板(211)的第一侧，并与所述导向孔(2111)连通；
    图像传感器固定板(222)，所述图像传感器固定板(222)位于所述安装板(211)的与第一侧相对的第二侧；
    导向轴(223)，所述导向轴(223)固定设置在所述图像传感器固定板(222)上，并从所述导向孔(2111)穿设在所述导向轴承(221)内。
  3. 根据权利要求2所述的后焦调节机构，其特征在于，所述驱动装置(10)驱动所述导向轴(223)向远离所述安装板(211)的方向运动，所述后焦调节机构还包括复位机构(30)，所述复位机构(30)用于使所述导向轴(223)复位。
  4. 根据权利要求3所述的后焦调节机构，其特征在于，所述图像传感器固定板(222)上固定设置有多根安装柱(2221)，多根所述安装柱(2221)围设在所述导向轴(223)的外周，各所述安装柱(2221)从所述安装板(211)的第二侧穿设至所述安装板(211)的第一侧，所述复位机构(30)包括：
    弹性复位件(31)，所述弹性复位件(31)套设在所述安装柱(2221)上；
    止挡组件(32)，所述止挡组件(32)可拆卸地设置在所述安装柱(2221)的远离所述安装板(211)的端部，所述弹性复位件(31)的两端分别抵接在所述止挡组件(32)和所述安装板(211)上。
  5. 根据权利要求4所述的后焦调节机构，其特征在于，所述止挡组件(32)包括螺栓(321)和垫片(322)，所述弹性复位件(31)为弹簧或弹性橡胶筒。
  6. 根据权利要求2所述的后焦调节机构，其特征在于，所述驱动装置(10)包括：
    驱动电机(11)；
    驱动螺柱(12)，所述驱动螺柱(12)在所述驱动电机(11)的驱动下转动；
    驱动螺母(13)，所述驱动螺母(13)套设在所述驱动螺柱(12)上，并在所述驱动螺柱(12)的驱动下驱动所述导向轴(223)向远离所述安装板(211)的方向运动。
  7. 根据权利要求6所述的后焦调节机构，其特征在于，所述后焦调节机构还包括限位支架(40)，所述限位支架(40)上设置有让位孔(411)，所述驱动螺柱(12)穿设在所述让位孔(411)内，所述驱动螺母(13)位于所述限位支架(40)的靠近所述导向轴(223)的一侧。
  8. 根据权利要求7所述的后焦调节机构，其特征在于，所述限位支架(40)包括两块限位板(41)，两块所述限位板(41)之间设置有多根支撑柱(42)，所述驱动螺母(13)上设置有定位块(131)，所述支撑柱(42)穿设在所述定位块(131)上，且所述驱动螺母(13)位于各所述支撑柱(42)围设形成的空间内。
  9. 根据权利要求8所述的后焦调节机构，其特征在于，所述两块限位板(41)中的第一块上设置有所述让位孔(411)，两块所述限位板(41)中的第二块上设置有通孔(412)，所述驱动螺母(13)的端部穿过所述通孔(412)以与所述导向轴(223)驱动连接。
  10. 根据权利要求6所述的后焦调节机构，其特征在于，所述驱动装置(10)还包括减速齿轮组(14)，所述减速齿轮组(14)与所述驱动电机(11)驱动连接，所述驱动螺柱(12)与所述减速齿轮组(14)驱动连接。
  11. 根据权利要求7所述的后焦调节机构，其特征在于，所述限位支架(40)上设置有光电开关(50)和电缆线(60)，所述光电开关(50)用于感应所述驱动螺母(13)的运动位置，所述电缆线(60)用于将所述驱动螺母(13)的运动位置传递给摄像机控制装置。
  12. 一种摄像机，包括镜头、图像传感器和后焦调节机构，所述后焦调 节机构用于调节所述镜头的焦点和所述图像传感器的成像平面之间的垂直距离，其特征在于，所述后焦调节机构为权利要求1至11中任一项所述的后焦调节机构，所述镜头设置于所述后焦调节机构的导向组件上(22)，所述图像传感器设置于所述后焦调节机构的定位组件(21)上。
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