WO2023124683A1 - 一种舞台灯的光学对焦方法以及舞台灯光学系统 - Google Patents

一种舞台灯的光学对焦方法以及舞台灯光学系统 Download PDF

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Publication number
WO2023124683A1
WO2023124683A1 PCT/CN2022/134401 CN2022134401W WO2023124683A1 WO 2023124683 A1 WO2023124683 A1 WO 2023124683A1 CN 2022134401 W CN2022134401 W CN 2022134401W WO 2023124683 A1 WO2023124683 A1 WO 2023124683A1
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light
focusing
real
photosensitive module
imaging
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PCT/CN2022/134401
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English (en)
French (fr)
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蒋伟楷
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广州市浩洋电子股份有限公司
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Publication of WO2023124683A1 publication Critical patent/WO2023124683A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/06—Controlling the distribution of the light emitted by adjustment of elements by movement of refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/105—Outdoor lighting of arenas or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/406—Lighting for industrial, commercial, recreational or military use for theatres, stages or film studios

Definitions

  • the invention relates to the technical field of stage lights, in particular to an optical focusing method for stage lights and an optical system for stage lights.
  • Stage lighting is one of the means of stage art modeling. Stage lighting is an important part of the performance space. It is used to design the lighting of the characters and the specific scenes required for the overall visual environment according to the development of the plot, and purposefully An artistic creation that reproduces the design intention to the audience in the form of visual images.
  • the stage lighting equipment will also be equipped with an auto-focus function.
  • Traditional auto-focus generally uses laser ranging to preset clear values corresponding to some distance points in the stage lights. This focusing method needs to do a lot of sampling data in the early stage to judge the aim point or distance, which may cause the clear values at different distances to be very close, which will cause inaccurate judgment of the clear values; or due to The mechanical error inside the stage lights, or due to insufficient sampling quantity, will cause the consistency of each light fixture to be different, or the fine-tuning gap of each light fixture is large, resulting in the inaccurate matching of the sampling data, which eventually leads to the focus of the stage light equipment The effect is not good, the projected image effect is not clear enough, still need to rely on manual focus.
  • the present invention provides an optical focusing method for stage lights and an optical system for stage lights, which can be more conducive to automatic focusing without relying on manual focusing, thereby ensuring that the stage lights can automatically project clear images at different projection positions. picture of.
  • the present invention is an optical focusing method for a stage light, which collects the light beam from the projected light spot and returns to the focal plane of the light source through the focusing lens group, and forms real-time imaging on the first photosensitive module, and the focusing system adjusts the
  • the position of the focusing lens group is such that the real-time focus point of the refracted light coincides with the ideal focus point, and the ideal focus point is the focus point of the light source or the conjugate point of the focus point.
  • the refracted light is reflected to the first imaging mirror by the first reflector, and is imaged in real time on the first photosensitive module on the other side of the first imaging mirror.
  • the focusing system calculates the real-time focus point of the reentrant light at this time according to the real-time imaging, and according to the deviation position of the real-time focus point relative to the ideal focus point.
  • the focusing system calculates the focusing distance of the focusing lens group according to the phase difference between the real-time focusing point and the ideal focusing point, and moves the focusing lens group corresponding to After the distance, the focus lens group is further fine-tuned and compensated according to the preset value.
  • the first photosensitive module is located at the ideal focusing point.
  • the position of the first light-sensing module or the focusing lens group is changed, and according to the change of the real-time imaging, it is judged that the return light is in the first light-sensing Whether the front-focus virtual image or the back-focus virtual image is formed in the module, and then the focusing lens group is moved correspondingly.
  • the second photosensitive module is used to collect the reentrant light at the same time, and the second photosensitive module is not located at the ideal focus point, according to the first photosensitive module, Respective real-time imaging on the second photosensitive module determines whether the folded light forms a front-focus virtual image or a back-focus virtual image in the first photosensitive module, and then moves the focusing lens group correspondingly.
  • the second reflecting mirror is used to reflect the refracted light to the second imaging mirror, and form an image in real time on the second photosensitive module on the other side of the second imaging mirror.
  • the focusing system compares the optical parameters of real-time imaging with preset optical parameters, and stops moving the focusing lens group when the optical parameters of real-time imaging reach the preset optical parameters.
  • the present invention also discloses a stage lighting optical system implementing the above method, including a focusing system and a light source, a focal plane is formed in the light emitting direction of the light source, and a focusing lens group, a magnifying lens group and
  • the light emitting lens group is characterized in that it also includes:
  • the first photosensitive module
  • the refracted light is imaged in real time on the first photosensitive module, and the focusing system adjusts the position of the focusing lens group according to the real-time imaging parameters on the first photosensitive module.
  • stage lighting optical system of the present invention also comprise:
  • the first reflector is arranged between the light source and the focusing lens group, and the first photosensitive module corresponds to the light output side of the first imaging mirror;
  • the first reflecting mirror receives the refracted light and reflects it to the light-incident side of the first imaging mirror, so that the refracted light is projected to the first photosensitive module through the light-emitting side of the first imaging mirror, to perform real-time imaging on the first photosensitive module.
  • a stage lighting optical system of the present invention also includes a second photosensitive module, and the refracted light is respectively imaged in real time on the first photosensitive module and the second photosensitive module through different projection directions, so The first photosensitive module is located at the ideal focus point, and the second photosensitive module is located at the non-ideal focus point.
  • a stage lighting optical system of the present invention also includes a second imaging mirror, and the refracted light is respectively reflected to the light-incident sides of the first imaging mirror and the second imaging mirror through different projection directions, so that the light in different directions
  • the refracted light is respectively projected to the first photosensitive module and the second photosensitive module through the light-emitting sides of the first imaging mirror and the second imaging mirror, so that the first photosensitive module and the second photosensitive module respectively Real-time imaging on the module.
  • stage lighting optical system of the present invention also includes a second reflector, the first reflector and the second reflector form a certain angle with each other, and the first reflector and the second reflector respectively reflecting the refracted light to the light incident sides of the first imaging mirror and the second imaging mirror in different directions.
  • the first photosensitive module and the second photosensitive module respectively include a first CCD array and a second CCD array, and enter the first photosensitive module and the second photosensitive module The reentrant light is imaged in real time on the first CCD array and the second CCD array respectively
  • the center of the first reflector is located at the focal point of the light source.
  • the focal point of the beam of the projected light spot returning to the focal plane of the light source through the focusing mirror group must fall on the focal plane of the light source, At this time, the focal point of the refracted light is also the ideal focusing point, that is, the focal point of the light source is the ideal focusing point.
  • the light beam from the projected spot through the focusing lens group is collected and returned to the focal plane, and the refracted light is projected on the first photosensitive module for real-time imaging. By analyzing the real-time imaging, the real-time focus of the refracted light can be confirmed.
  • the focusing lens group by controlling the focusing lens group to be close to the light source or away from the light source, after the real-time focusing point of the refracted light coincides with the ideal focusing point, the focusing of the stage lights can be realized synchronously.
  • the ideal focus point can also be the conjugate point of the focus point, so the focus system of the stage light has a reference for focus adjustment. It is beneficial to realize the automatic focusing of the stage lights, and no longer rely on manual focusing, so as to ensure that the stage lights automatically project clear patterns at different projection positions.
  • Fig. 1 is a brief schematic diagram of the overall structure of the scheme of the present invention.
  • Fig. 2 is the schematic diagram of the focal plane of the light beam returning to the light source from the projection spot through the focusing lens group in the solution of the present invention
  • Fig. 3 is the local schematic diagram of the scheme of the present invention.
  • Fig. 4 is the local schematic diagram of the scheme of the present invention.
  • Fig. 5 is a partial schematic diagram of the working principle of the scheme of the present invention (front focus virtual image);
  • Fig. 6 is a partial schematic diagram of the working principle of the scheme of the present invention (back focus virtual image);
  • Fig. 7 is a partial schematic diagram of the working principle of the scheme of the present invention.
  • Fig. 8 is a partial schematic diagram of the working principle of the solution of the present invention.
  • Light source 2. Focal plane, 3. Focusing mirror group, 4. Magnifying mirror group, 5. Light-emitting mirror group, 6. First reflector, 7. First imaging mirror, 8. First CCD array, 9. The second imaging mirror, 10, the second reflecting mirror, 11, the second CCD array.
  • the focusing system adjusts the position of the focusing lens group 3 according to the real-time imaging, that is, the focusing lens group 3 is driven to move forward or backward (away from or close to the light source 1) at the same time, the focusing system synchronously refers to the real-time imaging changes on the first photosensitive module, and finally makes the real-time focus point on the first photosensitive module coincide with the ideal focus point of the refracted light.
  • the accurate focus of the stage light can be realized synchronously, and the ideal focus point is the focus point of the light source or the conjugate point of the focus point.
  • the focal point of the light beam of the projected spot passing through the focusing lens group and returning to the focal plane of the light source must fall on the focal plane of the light source.
  • the focus of the refracted light is also the ideal focus point, that is, the focus of the light source is the ideal focus point.
  • the light beam from the projected spot through the focusing lens group is collected and returned to the focal plane, and the refracted light is projected on the first photosensitive module for real-time imaging. By analyzing the real-time imaging, the real-time focus of the refracted light can be confirmed.
  • the focusing lens group by controlling the focusing lens group to be close to the light source or away from the light source, after the real-time focusing point of the refracted light coincides with the ideal focusing point, the focusing of the stage lights can be realized synchronously.
  • the ideal focus point can also be the conjugate point of the focus point, so the focus system of the stage light has a reference for focus adjustment. It is beneficial to realize the automatic focusing of the stage lights, and no longer rely on manual focusing, so as to ensure that the stage lights automatically project clear patterns at different projection positions.
  • the refracted light is reflected to the first imaging mirror 7 by the first reflector 6, and is placed on the first photosensitive module on the light-emitting side of the first imaging mirror 7. constitute real-time imaging.
  • the refracted light can be effectively collected, and at the same time, the first imaging mirror 7 is used to receive the emitted light beam and smoothly project it onto the first photosensitive module, so that the real-time imaging A can be effectively generated .
  • the first reflector 6 it can be realized that the first photosensitive module is not arranged on the main optical axis of the light source 1, so as to prevent the light source 1 from blocking the light, and the first reflector 6 can be made of a transparent material , only part of the refracted light is reflected to the first photosensitive module, and at the same time, the blocking effect on light from the light source 1 is also small.
  • FIGS. constitute real-time imaging.
  • the use of the CCD array can more accurately display the real-time imaging position, facilitate accurate detection of the focusing system, and improve the accuracy of focusing.
  • the focusing system calculates the real-time focusing point A of the reentrant light at this time according to the real-time imaging, and the calculation is based on parameters such as the shape, brightness distribution, and spectral distribution of the real-time imaging.
  • the focusing system can use the real-time imaging parameters such as shape, brightness distribution, and spectral distribution to calculate the real-time Focusing point position parameters, so that the moving direction of the focusing system to control the focusing lens group 3 can be determined according to the deviation position of the real-time focusing point A relative to the conjugate point B (which is the ideal focusing point at this time).
  • the real-time focusing point A can be calculated through the CCD array, and the focusing system is calculated based on the phase difference between the real-time focusing point A and the conjugate point B.
  • the focusing distance of the focusing lens group 3 is adjusted, and the focusing lens group 3 is moved by a corresponding distance, and the focusing lens group is further fine-tuned and compensated according to the preset value.
  • the position of the real-time focus point A can be calculated by the CCD array.
  • the real-time focus point A belongs to Front focus (if it is front focus, the focusing system needs to drive the focusing lens group 3 to move toward the light source 1, close to the light source 1), as shown in Figure 3 and Figure 6, if the real-time focus point is at position a1, the real-time focus The focal point belongs to the back focus (if it is the back focus, the focusing system needs to drive the focusing lens group 3 to move away from the light source 1, away from the light source 1), so it can help the focusing system to judge the focus of the focusing lens group 3 drive direction, and at the same time calculate the phase difference between the real-time focusing point and the conjugate point B (ie c1-B, or a1-B), and finally help the focusing system to determine the movement
  • the fine-tuning compensation takes into account the design error of the mechanical structure. Since the error will not change, before the lamp is produced, test the difference between the position of the focusing lens group 3 and the value automatically calculated by the system when the projected light spot is perfectly clear. According to the experimental results, the value of fine-tuning compensation is preset, which can make each focusing more perfect.
  • the first photosensitive module is located at the conjugate point B, that is, the first CCD array 8 is located at the conjugate point B. In other embodiments, the first photosensitive module can be directly located at the light source 1
  • the focus points are all ideal focus points. It can be understood that setting the CCD array at the pre-calculated ideal focus point (the focus of light source 1 or the conjugate point of the focus) allows the CCD array to be used as a focus reference, for example, when the real-time imaging of the refracted light is on the first CCD
  • the clearest display on array 8 can simultaneously determine that the stage lights are currently in an accurate focus state. Therefore, the focusing system only needs to detect the imaging of the reentrant light on the CCD array to judge the focusing command issued to the focusing lens group 3.
  • the position of the first CCD array 8 or the focusing lens group 3 is changed, and the refracted light is judged according to the real-time imaging A front-focus virtual image or a back-focus virtual image is formed in the CCD array 8, and then the focusing lens group 3 is moved correspondingly.
  • the focusing lens group 3 (or the first The position of the CCD array 8) allows the reentrant light to be imaged in the first CCD array 8 for multiple times, and the first CCD array 8 records the parameters of each imaging spot (such as the size of the spot), and then compares the parameters of each imaging spot parameters, it can be judged whether the real-time imaging of the refracted light in the first CCD array 8 is in the front-focus virtual image or the back-focus virtual image, thereby judging the focusing direction.
  • the focusing system needs to drive the focusing mirror Group 3 moves towards light source 1 and is close to light source 1. If it is a back-focused virtual image, the focusing system needs to drive focusing lens group 3 to move away from light source 1, away from light source 1, so as to make the real-time imaging of A real-time The focus gradually moves to the ideal focus point a1 step by step to complete accurate autofocus.
  • the second CCD array 11 is located at a non-ideal focus point (that is, not at the focus of the light source 1 or Conjugate point B), according to the real-time imaging (such as the size of the spot) on the first CCD array 8 and the second CCD array 11, judge whether the reentrant light forms a front-focus virtual image or a back-focus virtual image in the CCD array, and then correspond to Move the focusing lens group 3.
  • the first CCD array 8 is arranged on the conjugate point B, and the second CCD array 11 is arranged on the non-conjugate point B (front focus position or rear focus position) simultaneously ), after projecting the refracted light from two directions to the first CCD array 8 and the rear second CCD array 11, by comparing the real-time imaging of the first CCD array 8 and the real-time imaging of the second CCD array 11, the real-time Whether the imaging is in the front focus or the back focus, so as to determine the focusing direction. If it is a front focus virtual image, the focusing system needs to drive the focusing lens group 3 to move in the direction of light source 1, close to the light source 1.
  • the focus system needs to drive the focusing lens group 3 to move away from the light source 1, away from the light source 1, so as to gradually move the real-time focus point of real-time imaging to the ideal focus point B step by step to complete accurate auto-focus.
  • the focusing system compares the real-time imaging optical parameter with the preset optical parameter, and stops moving the focusing lens group when the real-time imaging optical parameter reaches the preset optical parameter.
  • this implementation also provides an optical system for stage lights, which is used to implement an optical focusing method for stage lights of the present invention, as shown in Figures 1 to 4, including a focusing system and a light source 1, in the light output direction of the light source 1 A focal plane 2 is formed on it, and a focusing lens group 3, a magnifying lens group 4, and a light output lens group 5 are sequentially arranged behind the focal plane 2, and a first photosensitive module is also included.
  • Real-time imaging is performed on the first photosensitive module, and the focusing system adjusts the position of the focusing lens group 3 according to the real-time imaging parameters on the first photosensitive module.
  • a first imaging mirror 7 and a first reflecting mirror 6 are also included.
  • the first reflecting mirror 6 is arranged between the light source 1 and the focusing lens group 3.
  • the first photosensitive The module corresponds to the light-emitting side of the first imaging mirror 7, wherein the first reflector 6 receives the refracted light and reflects it to the light-receiving side of the first imaging mirror 7, allowing the refracted light to be projected through the light-emitting side of the first imaging mirror 7 to the first photosensitive module for real-time imaging on the first photosensitive module.
  • the first reflecting mirror 6 between the light source 1 and the focusing lens group 3, it is convenient to collect the refracted light, and under the imaging effect of the first imaging mirror 7, the collected refracted light can be Smoothly projected on the first photosensitive module for real-time imaging.
  • a second imaging mirror 9 and a second photosensitive module are also included.
  • the first photosensitive module and the second photosensitive module respectively include a first The CCD array 8 and the second CCD array 11, the refracted light is respectively reflected to the light incident side of the first imaging mirror 7 and the second imaging mirror 9 through different directions, so that the refracted light in different directions passes through the first imaging mirror 7 respectively and the light exit side of the second imaging mirror 9 are respectively projected to the first CCD array 8 and the second CCD array 11 to respectively image in real time on the first CCD array 8 and the second CCD array 11, and the first CCD array 8 is located at An ideal focus point, the second CCD array 11 is located at a non-ideal focus point.
  • the function of the second imaging mirror 9 is to allow the refracted light to be smoothly projected on the second CCD array 11 to realize real-time imaging.
  • the first CCD array 8 is arranged at the conjugate point B.
  • set the second CCD array 11 at the non-conjugate point B front focus position or back focus position
  • the focus adjustment system needs Drive the focusing lens group 3 to move towards the light source 1, close to the light source 1, if it is a back focus virtual image, then the focusing system needs to drive the focusing lens group 3 to move away from the light source 1, away from the light source 1, so as to realize real-time imaging
  • the real-time focus point of the real-time focus point gradually moves to the ideal focus point B step by step to complete accurate autofocus.
  • the refracted light entering the first photosensitive module and the second photosensitive module is respectively imaged in real time on the first CCD array 8 and the second CCD array 11. It can be understood that the real-time imaging can be displayed more accurately by using the CCD array The position is convenient for the accurate detection of the focusing system and can improve the accuracy of focusing.
  • FIG. 4 it also includes a second reflector 10, the first reflector 6 and the second reflector 10 form a certain angle with each other, and the first reflector 6 and the second reflector 10 respectively The refracted light is respectively reflected to the light incident sides of the first imaging mirror 7 and the second reflecting mirror 10 in different directions.
  • first reflector 6 and the second reflector 10 are arranged between the focusing lens group 3 and the focal plane 2 to form a certain angle with each other, so that multiple beams from different directions can be effectively collected, and multiple beams from different directions can be effectively collected.
  • the light beams from different directions are respectively reflected to the light-incident sides of the first imaging mirror 7 and the second reflecting mirror 10, finally allowing the first CCD array 8 and the second CCD array 11 in different positions to receive the refracted light respectively to utilize Real-time imaging on the first CCD array 8 and the second CCD array 11 assists the focusing system in judging focus.
  • the center of the first reflector 6 is located at the focal point of the light source 1 .
  • the first reflector 6 and the second reflector 10 are semi-transparent mirrors, and the front sides of the first reflector 6 and the second reflector 10 are reflective surfaces, and the reflective surfaces
  • the front corresponds to the focusing mirror group 3
  • the rear sides of the first reflector 6 and the second reflector 10 are non-reflective surfaces, and the non-reflective surface corresponds to the focal plane 2 at the rear. Since the reflector 6 is a semi-transparent mirror, Therefore, the light source can be allowed to pass through, the light beam passing through the focal plane 2 can be avoided, the normal projection of the stage light can be ensured, and it can also play the role of reflection, which is convenient to use.

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Abstract

一种舞台灯的光学对焦方法以及舞台灯光学系统，通过收集从投影光斑经过调焦镜组（3）折返光源（1）的焦平面（2）的折返光，并在第一光感模块上实时成像，调焦系统根据实时成像调节调焦镜组（3）的位置，使折返光的实时对焦点与理想对焦点重合，理想对焦点为光源（1）的焦点或者焦点的共轭点。能有助于提高舞台灯的对焦精度，更有利于实现自动调焦，不依赖人工调焦，从而可以确保舞台灯在不同的投射位置自动投射出清晰的图案。

Description

一种舞台灯的光学对焦方法以及舞台灯光学系统 技术领域
本发明涉及舞台灯光技术领域，尤其涉及一种舞台灯的光学对焦方法以及舞台灯光学系统。
 背景技术
舞台灯光是舞台美术造型的手段之一，舞台灯光是演出空间构成的重要组成部分，用于根据情节的发展对人物以及所需的特定场景进行全方位的视觉环境的灯光设计，并有目的地将设计意图以视觉形象的方式再现给观众的艺术创作。
 技术问题
然而，为了在不同的场景实现清晰的投射效果，舞台灯光设备内还会配备自动对焦功能，传统的自动对焦一般是利用激光测距，在舞台灯内预设一些距离点所对应的清晰数值。这种调焦方法在前期需要做很多的取样数据，以进行瞄点或者距离判断，如此可能会产生不同距离的清晰数值很接近的情况，从而就会造成清晰数值判断不准确的情况；或者由于舞台灯内部的机械误差，或由于取样数量不充分，均会造成每台灯具的一致性不同，或者每台灯具的微调差距较大，造成了取样数据不能准确匹配，最终导致舞台灯设备的对焦效果不佳，投射的图像效果不够清晰，仍然需要依赖人工调焦。
 技术解决方案
有鉴于此，本发明提供一种舞台灯的光学对焦方法以及舞台灯光学系统，能更有利于实现自动调焦，不依赖人工调焦，从而可以确保舞台灯在不同的投射位置自动投射出清晰的图案。
本发明一种舞台灯的光学对焦方法，收集从投影光斑经过调焦镜组折返光源的焦平面的光束，并在第一光感模块上实时成像，调焦系统根据所述实时成像调节所述调焦镜组的位置，使折返光的实时对焦点与理想对焦点重合，所述理想对焦点为光源的焦点或者焦点的共轭点。
根据本发明的一种舞台灯的光学对焦方法，利用第一反射镜把折返光反射至第一成像镜，并在第一成像镜另一侧的所述第一光感模块上实时成像。
根据本发明的一种舞台灯的光学对焦方法，调焦系统根据所述实时成像计算此时折返光的实时对焦点，根据所述实时对焦点相对于理想对焦点的偏离位置。
根据本发明的一种舞台灯的光学对焦方法，所述调焦系统根据实时对焦点与理想对焦点之间的相位差计算对调焦镜组的调焦距离，并将调焦镜组移动对应距离后进一步根据预设值对调焦镜组进行微调补偿。
根据本发明的一种舞台灯的光学对焦方法，所述第一光感模块位于所述理想对焦点。
根据本发明的一种舞台灯的光学对焦方法，改变所述第一光感模块或所述调焦镜组的位置，根据所述实时成像的变化判断所述折返光在所述第一光感模块中形成的是前焦虚像还是后焦虚像，然后对应移动所述调焦镜组。
根据本发明的一种舞台灯的光学对焦方法，利用第二光感模块同时收集所述折返光，所述第二光感模块位于非所述理想对焦点，根据所述第一光感模块、所述第二光感模块上分别的实时成像，判断所述折返光在所述第一光感模块中形成的是前焦虚像还是后焦虚像，然后对应移动所述调焦镜组。
根据本发明的一种舞台灯的光学对焦方法，利用第二反射镜把折返光反射至第二成像镜，并在第二成像镜另一侧的所述第二光感模块上实时成像。
根据本发明的一种舞台灯的光学对焦方法，调焦系统对比实时成像的光参数与预设光参数，当实时成像的光参数达到预设光参数时，停止移动所述调焦镜组。
本发明还公开一种实施上述方法的舞台灯光学系统，包括调焦系统和光源，在光源的出光方向上形成有焦平面，并在所述焦平面之后依次设置调焦镜组、放大镜组以及出光镜组，其特征在于，还包括：
第一光感模块；
其中，所述折返光在所述第一光感模块上实时成像，所述调焦系统根据所述第一光感模块上的实时成像参数调节所述调焦镜组的位置。
根据本发明的一种舞台灯光学系统，还包括：
第一成像镜；
第一反射镜，设置在所述光源与调焦镜组之间，所述第一光感模块对应在所述第一成像镜的出光侧；
其中，所述第一反射镜承接所述折返光并反射至所述第一成像镜的入光侧，让折返光通过所述第一成像镜的出光侧投射至所述第一光感模块，以在所述第一光感模块上实时成像。
根据本发明的一种舞台灯光学系统，还包括第二光感模块，所述折返光通过不同的投射方向分别在所述第一光感模块和所述第二光感模块上实时成像，所述第一光感模块位于理想对焦点，所述第二光感模块位于非理想对焦点。
根据本发明的一种舞台灯光学系统，还包括第二成像镜，所述折返光通过不同的投射方向分别反射至所述第一成像镜和第二成像镜的入光侧，让不同方向的折返光分别通过所述第一成像镜和第二成像镜的出光侧分别投射至所述第一光感模块和第二光感模块，以分别在所述第一光感模块和第二光感模块上实时成像。
根据本发明的一种舞台灯光学系统，还包括第二反射镜，所述第一反射镜与所述第二反射镜相互构成一定夹角，所述第一反射镜与所述第二反射镜分别把所述折返光以不同方向分别反射至所述第一成像镜和所述第二成像镜的入光侧。
根据本发明的一种舞台灯光学系统，所述第一光感模块和第二光感模块分别包含第一CCD数组和第二CCD数组，进入所述第一光感模块和第二光感模块的折返光分别在所述第一CCD数组和第二CCD数组上实时成像
根据本发明的一种舞台灯光学系统，所述第一反射镜的中心位于所述光源的焦点位置。
 有益效果
本发明的一种舞台灯的光学对焦方法，由于舞台灯在投射的光斑成像最清晰时，投影光斑经过调焦镜组折返光源的焦平面的光束的焦点必然是落在光源的焦平面处，此时折返光的焦点也就是理想对焦点，即光源的焦点为理想对焦点。根据光线的可逆性收集从投影光斑经过调焦镜组折返向焦平面的光束，并把折返光投射在第一光感模块上以实时成像，通过分析实时成像，可以确认折返光的实时焦点，相应地调节调焦镜组的位置，通过控制调焦镜组靠近光源或远离光源，使折返光的实时对焦点与理想对焦点重合后，便可以同步实现舞台灯的对焦，根据共轭原理，如果折返光经过了反射镜的反射，不是一直逆着光源的主光轴方向前进，理想对焦点也可以为焦点的共轭点，因此舞台灯的调焦系统便有了调焦的参照，有利于实现舞台灯的自动调焦，可不再依赖人工调焦，从而可以确保舞台灯在不同的投射位置自动投射出清晰的图案。
 附图说明
为了更清楚地说明本发明或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明方案的整体结构简要示意图；
图2是本发明方案中光束从投影光斑经过调焦镜组折返光源的焦平面示意图；
图3是本发明方案的局部示意图；
图4是本发明方案的局部示意图；
图5是本发明方案的工作原理局部示意图（前焦虚像）；
图6是本发明方案的工作原理局部示意图（后焦虚像）；
图7是本发明方案的工作原理局部示意图；
图8是本发明方案的工作原理局部示意图。
附图标记：
1、光源，2、焦平面，3、调焦镜组，4、放大镜组，5、出光镜组，6、第一反射镜，7、第一成像镜，8、第一CCD数组，9、第二成像镜，10、第二反射镜，11、第二CCD数组。
 本发明的实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
如图1~图3所示，以舞台灯内部的光学系统为参照，阐述本发明的一种舞台灯的光学对焦方法，当舞台灯进行灯效的投射工作时，光源1发出的光束途经焦平面2后进入调焦镜组3，再进入放大镜组4，最终从出光镜组5向外射出，在投影目标形成投影光斑，而投影光斑会有部分的光束依次通过出光镜组5、放大镜组4和调焦镜组3折返回焦平面2，利用发明的舞台灯光学对焦方法，首先收集从投影光斑经过调焦镜组3折返光源的焦平面2的折返光，并引导该折返光投射至第一光感模块上，让折返的光束在第一光感模块上实时成像，调焦系统根据实时成像调节调焦镜组3的位置，即在驱动调焦镜组3向前或向后移动（背离或靠近光源1）的同时，调焦系统同步参照实时成像在第一光感模块上的变化，最终让折返光在第一光感模块上的实时对焦点与理想对焦点重合，此时便可以同步实现舞台灯的准确对焦，而所述的理想对焦点为光源的焦点或者焦点的共轭点。
在本实施例的光学对焦方法中，由于舞台灯在投射的光斑成像最清晰时，投影光斑经过调焦镜组折返光源的焦平面的光束的焦点必然是落在光源的焦平面处，此时折返光的焦点也就是理想对焦点，即光源的焦点为理想对焦点。根据光线的可逆性收集从投影光斑经过调焦镜组折返向焦平面的光束，并把折返光投射在第一光感模块上以实时成像，通过分析实时成像，可以确认折返光的实时焦点，相应地调节调焦镜组的位置，通过控制调焦镜组靠近光源或远离光源，使折返光的实时对焦点与理想对焦点重合后，便可以同步实现舞台灯的对焦，根据共轭原理，如果折返光经过了反射镜的反射，不是一直逆着光源的主光轴方向前进，理想对焦点也可以为焦点的共轭点，因此舞台灯的调焦系统便有了调焦的参照，有利于实现舞台灯的自动调焦，可不再依赖人工调焦，从而可以确保舞台灯在不同的投射位置自动投射出清晰的图案。
在一个实施例中，结合图1~4所示，利用第一反射镜6把所述折返光反射至第一成像镜7，并在第一成像镜7的出光侧的第一光感模块上构成实时成像。
可以理解，通过第一反射镜6的反光特性，可以有效收集所述折返光，同时利用第一成像镜7接收发射光束，并顺利地投射至第一光感模块上，使实时成像A有效生成。通过设置所述第一反射镜6可以实现将所述第一光感模块不设置在光源1的主光轴上，避免所述光源1遮挡光线，而所述第一反射镜6可以为透明材质，仅将部分折返光反射至所述第一光感模块，同时对光源1光线的遮挡影响也较小。
在一个实施例中，可选地，结合图1~4所示，折返光通过第一成像镜7投射至第一光感模块内的第一CCD数组8中，并在第一CCD数组8中构成实时成像。
可以理解，利用CCD数组更能精确显示实时成像的位置，便于调焦系统的准确检测，能提高调焦的准确性。
在一个实施例中，结合图1~4所示，调焦系统根据实时成像计算此时折返光的实时对焦点A，计算的依据是实时成像的形状、亮度分布、光谱分布等参数。
可以理解，当折返光通过第一成像镜7投射至第一CCD数组8并生成实时成像时，调焦系统便可以利用实时成像的形状、亮度分布、光谱分布等参数，计算出折返光的实时对焦点位置参数，从而便可以根据实时对焦点A相对于共轭点B（此时其为理想对焦点）的偏离位置，确定调焦系统控制调焦镜组3的移动方向。
具体地，结合图1~4所示，第一CCD数组8生成实时成像后，可以通过CCD数组计算出实时对焦点A，调焦系统根据实时对焦点A与共轭点B之间的相位差计算对调焦镜组3的调焦距离，并将调焦镜组3移动对应距离后进一步根据预设值对调焦镜组进行微调补偿。
可以理解，第一CCD数组8生成实时成像后，可以通过CCD数组计算出实时对焦点A的位置，结合图3和图5所示，如果实时对焦点A位于c1位置，则实时对焦点c1属于前焦（若为前焦，则调焦系统需要驱动调焦镜组3往光源1方向移动，靠近光源1），结合图3和图6所示，如果实时对焦点位于a1位置，则实时对焦点属于后焦（若为后焦，则调焦系统需要驱动调焦镜组3往背离光源1的方向移动，远离光源1），因此便可以帮助调焦系统判断出对调焦镜组3的驱动方向，同时计算得出实时对焦点与共轭点B的相位差（即c1-B，或a1-B），最后便可以帮助调焦系统判断出控制调焦镜组3的移动行程，即具体的调焦距离，最后根据预设值对调焦镜组3进行微调补偿，补偿机械误差，从而可以让舞台灯更加精确地自动对焦。
微调补偿是考虑到机械结构设计误差，由于误差是不会变的，因此在灯具出产之前，测试其投影光斑完美清晰时，调焦镜组3位置与系统自动计算出的数值之间的差异，根据实验结果预设微调补偿的数值，可以使每次的调焦更加完美。
在一个实施例中，第一光感模块位于共轭点B，即第一CCD数组8位于共轭点B，在其他实施例中，所述第一光感模块可以直接位于所述光源1的焦点，均属于理想对焦点。可以理解，把CCD数组设置在预先计算好的理想对焦点（光源1的焦点或者焦点的共轭点），让CCD数组可以作为一个对焦的参照基准，例如当折返光的实时成像在第一CCD数组8上显示最为清晰，便可以同步确定舞台灯目前已处于准确对焦状态，因此调焦系统只要通过检测折返光在CCD数组上的成像情况，判断对调焦镜组3发出的调焦指令。
在一个实施例中，结合图7所示，当第一CCD数组8位于共轭点B时，改变第一CCD数组8或调焦镜组3的位置，根据所述实时成像判断折返光在第一CCD数组8中形成的是前焦虚像还是后焦虚像，然后对应移动调焦镜组3。
也就是说，当第一CCD数组8位于共轭点B时，将折返光反射进入第一成像镜7并投射至第一CCD数组8后，通过多次改变调焦镜组3（或第一CCD数组8）的位置，让折返光多次分别在第一CCD数组8中成像，让第一CCD数组8记录每次成像光斑的参数（例如光斑的大小），然后通过对比每次成像光斑的参数，可以判断出折返光此时在第一CCD数组8中的实时成像是处于前焦虚像还是后焦虚像，从而判断调焦方向，若为前焦虚像，则调焦系统需要驱动调焦镜组3往光源1方向移动，靠近光源1，若为后焦虚像，则调焦系统需要驱动调焦镜组3往背离光源1的方向移动，远离光源1，以此把实时成像A的实时对焦点一步一步地逐渐往理想对焦点a1移动，即可完成准确自动对焦。
在一个实施例中，结合图8所示，利用第二光感模块中的第二CCD数组11同时所述折返光，第二CCD数组11位于非理想对焦点（即不位于光源1的焦点或者共轭点B），根据第一CCD数组8、第二CCD数组11上分别的实时成像（例如光斑的大小），判断折返光在CCD数组中形成的是前焦虚像还是后焦虚像，然后对应移动调焦镜组3。
也就是说，结合图8所示，在本方案中，把第一CCD数组8设置于共轭点B，同时把第二CCD数组11设置于非共轭点B（前焦位置或后焦位置），将折返光从两个方向分别投射至第一CCD数组8和后第二CCD数组11后，通过对比第一CCD数组8的实时成像和第二CCD数组11的实时成像，可以直接判断实时成像处于前焦还是后焦，从而判断出调焦方向，若为前焦虚像，则调焦系统需要驱动调焦镜组3往光源1方向移动，靠近光源1，若为后焦虚像，则调焦系统需要驱动调焦镜组3往背离光源1的方向移动，远离光源1，以此把实时成像的实时对焦点一步一步地逐渐往理想对焦点B移动，即可完成准确自动对焦。
在一个实施例中，调焦系统对比实时成像的光参数与预设光参数，当实时成像的光参数达到预设光参数时，停止移动所述调焦镜组。   
可以理解，通过预先计算折返光的落在理想对焦点a1时的光斑参数，以此参数作为调焦依据，在调焦过程中，当调焦系统检测到折返光在CCD数组上的实时成像的光斑参数与预设的光斑参数匹配时，便可以自动判断舞台灯达到对焦状态，从而可以停止继续移动所述调焦镜组3，因此让舞台灯的调焦系统拥有更多的调焦参照，更有利于实现舞台灯的自动调焦。
另外，本实施还提供一种舞台灯光学系统，用于实施本发明的一种舞台灯的光学对焦方法，如图1~4所示，包括调焦系统和光源1，在光源1的出光方向上形成有焦平面2，并在所述焦平面2之后依次设置有调焦镜组3、放大镜组4以及出光镜组5，还包括第一光感模块，工作时，所述折返光在第一光感模块上实时成像，调焦系统根据第一光感模块上的实时成像参数调节调焦镜组3的位置。
在一个实施例中，如图1~4所示，还包括第一成像镜7和第一反射镜6，第一反射镜6设置在光源1与调焦镜组3之间，第一光感模块对应在第一成像镜7的出光侧，其中，第一反射镜6承接所述折返光并反射至第一成像镜7的入光侧，让折返光通过第一成像镜7的出光侧投射至第一光感模块，以在第一光感模块上实时成像。
可以理解，通过把第一反射镜6设置在光源1与调焦镜组3之间，能够便于收集所述折返光，并且在第一成像镜7的成像作用下，可以把收集到的折返光顺利地投射在第一光感模块上以实时成像。
在一个实施例中，结合图1~图3和图8所示，还包括第二成像镜9和第二光感模块，具体地，第一光感模块和第二光感模块分别包含第一CCD数组8和第二CCD数组11，所述折返光通过不同的方向分别反射至第一成像镜7和第二成像镜9的入光侧，让不同方向的折返光分别通过第一成像镜7和第二成像镜9的出光侧分别投射至第一CCD数组8和第二CCD数组11，以分别在第一CCD数组8和第二CCD数组11上实时成像，所述第一CCD数组8位于理想对焦点，所述第二CCD数组11位于非理想对焦点。
可以理解，第二成像镜9的作用是可以让折返光顺利投射在第二CCD数组11上，以实现实时成像，结合图3和图8所示，把第一CCD数组8设置于共轭点B，同时把第二CCD数组11设置于非共轭点B（前焦位置或后焦位置），将折返光从两个方向分别投射至第一CCD数组8和后第二CCD数组11后，通过对比第一CCD数组8的实时成像和第二CCD数组11的实时成像，可以直接判断实时成像处于前焦还是后焦，从而判断出调焦方向，若为前焦虚像，则调焦系统需要驱动调焦镜组3往光源1方向移动，靠近光源1，若为后焦虚像，则调焦系统需要驱动调焦镜组3往背离光源1的方向移动，远离光源1，以此把实时成像的实时对焦点一步一步地逐渐往理想对焦点B移动，即可完成准确自动对焦。
在一个实施例中，进入第一光感模块和第二光感模块的折返光分别在第一CCD数组8和第二CCD数组11上实时成像，可以理解，利用CCD数组更能精确显示实时成像的位置，便于调焦系统的准确检测，能提高调焦的准确性。
在一个实施例中，如图4所示，还包括第二反射镜10，第一反射镜6与第二反射镜10相互构成一定夹角，第一反射镜6与第二反射镜10分别把所述折返光以不同方向分别反射至第一成像镜7和第二反射镜10的入光侧。
可以理解，利用第一反射镜6与第二反射镜10相互构成一定夹角地设置在调焦镜组3与焦平面2之间，能够有效地收集多道来自不同方向的光束，利用多道来自不同方向的光束分别反射至第一成像镜7和第二反射镜10的入光侧，最终可以让处于不同位置的第一CCD数组8和第二CCD数组11能够分别接收折返光，以利用第一CCD数组8和第二CCD数组11上的实时成像协助调焦系统判断对焦。
在一个实施例中，如图1~图4所示，第一反射镜6的中心位于光源1的焦点位置。
在一个实施例中，结合图4所示，第一反射镜6和第二反射镜10为半透反射镜，第一反射镜6和第二反射镜10的前侧面均为反射面，反射面向前对应于调焦镜组3，而第一反射镜6和第二反射镜10的后侧面均为非反射面，非反射面向后对应于焦平面2，由于反射镜6为半透反射镜，因此可以允许光源穿过，可以避免遮蔽从焦平面2穿出的光束，确保舞台灯的正常投射，并且也可以起到反射的作用，使用方便。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明实施例的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims (16)

  1. 一种舞台灯的光学对焦方法，其特征在于，收集从投影光斑经过调焦镜组折返光源的焦平面的折返光，并在第一光感模块上实时成像，调焦系统根据所述实时成像调节所述调焦镜组的位置，使折返光的实时对焦点与理想对焦点重合，所述理想对焦点为光源的焦点或者焦点的共轭点。
  2. 根据权利要求1所述的舞台灯的光学对焦方法，其特征在于，利用第一反射镜把折返光反射至第一成像镜，并在第一成像镜另一侧的所述第一光感模块上实时成像。
  3. 根据权利要求1所述的舞台灯的光学对焦方法，其特征在于，调焦系统根据所述实时成像计算此时折返光的实时对焦点，根据所述实时对焦点相对于理想对焦点的偏离位置。
  4. 根据权利要求3所述的舞台灯的光学对焦方法，其特征在于，所述调焦系统根据实时对焦点与理想对焦点之间的相位差计算对调焦镜组的调焦距离，并将调焦镜组移动对应距离后进一步根据预设值对调焦镜组进行微调补偿。
  5. 根据权利要求1所述的舞台灯的光学对焦方法，其特征在于，所述第一光感模块位于所述理想对焦点。
  6. 根据权利要求5所述的舞台灯的光学对焦方法，其特征在于，改变所述第一光感模块或所述调焦镜组的位置，根据所述实时成像的变化判断所述折返光在所述第一光感模块中形成的是前焦虚像还是后焦虚像，然后对应移动所述调焦镜组。
  7. 根据权利要求5所述的舞台灯的光学对焦方法，其特征在于，利用第二光感模块同时收集折返光，所述第二光感模块位于非所述理想对焦点，根据所述第一光感模块、所述第二光感模块上分别的实时成像，判断所述折返光在所述第一光感模块中形成的是前焦虚像还是后焦虚像，然后对应移动所述调焦镜组。
  8. 根据权利要求7所述的舞台灯的光学对焦方法，其特征在于，利用第二反射镜把折返光反射至第二成像镜，并在第二成像镜另一侧的所述第二光感模块上实时成像。
  9. 根据权利要求6或7所述的舞台灯的光学对焦方法，其特征在于，调焦系统对比实时成像的光参数与预设光参数，当实时成像的光参数达到预设光参数时，停止移动所述调焦镜组。
  10. 一种实施权利要求1~9任一项所述方法的舞台灯光学系统，包括调焦系统和光源（1），在光源（1）的出光方向上形成有焦平面（2），并在所述焦平面（2）后依次设置有调焦镜组（3）、放大镜组（4）以及出光镜组（5），其特征在于，还包括：
    第一光感模块；
    其中，从所述折返光在所述第一光感模块上实时成像，所述调焦系统根据所述第一光感模块上的实时成像参数调节所述调焦镜组（3）的位置。
  11. 根据权利要求10所述的舞台灯光学系统，其特征在于，还包括：
    第一成像镜（7）；
    第一反射镜（6），设置在所述光源（1）与调焦镜组（3）之间，所述第一光感模块对应在所述第一成像镜（7）的出光侧；
    其中，所述第一反射镜（6）承接折返光并反射至所述第一成像镜（7）的入光侧，让折返光通过所述第一成像镜（7）的出光侧投射至所述第一光感模块，以在所述第一光感模块上实时成像。
  12. 根据权利要求11所述的舞台灯光学系统，其特征在于，还包括第二光感模块，所述折返光通过不同的投射方向分别在所述第一光感模块和所述第二光感模块上实时成像，所述第一光感模块位于理想对焦点，所述第二光感模块位于非理想对焦点。
  13. 根据权利要求12所述的舞台灯光学系统，其特征在于，还包括第二成像镜（9），所述折返光通过不同的投射方向分别反射至所述第一成像镜（7）和第二成像镜（9）的入光侧，让不同方向的折返光分别通过所述第一成像镜（7）和第二成像镜（9）的出光侧分别投射至所述第一光感模块和第二光感模块，以分别在所述第一光感模块和第二光感模块上实时成像。
  14. 根据权利要求13所述的舞台灯光学系统，其特征在于，还包括第二反射镜（10），所述第一反射镜（6）与所述第二反射镜（10）相互构成一定夹角，所述第一反射镜（6）与所述第二反射镜（10）分别把所述折返光以不同方向分别反射至所述第一成像镜（7）和所述第二成像镜（9）的入光侧。
  15. 根据权利要求12所述的舞台灯光学系统，其特征在于，所述第一光感模块和第二光感模块分别包含第一CCD数组（8）和第二CCD数组（11），进入所述第一光感模块和第二光感模块的折返光分别在所述第一CCD数组（8）和第二CCD数组（11）上实时成像。
  16. 根据权利要求11所述的舞台灯光学系统，其特征在于，所述第一反射镜（6）的中心位于所述光源（1）的焦点位置。
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