WO2019085260A1 - 自动调焦系统、方法以及投影设备 - Google Patents

自动调焦系统、方法以及投影设备 Download PDF

Info

Publication number
WO2019085260A1
WO2019085260A1 PCT/CN2018/071434 CN2018071434W WO2019085260A1 WO 2019085260 A1 WO2019085260 A1 WO 2019085260A1 CN 2018071434 W CN2018071434 W CN 2018071434W WO 2019085260 A1 WO2019085260 A1 WO 2019085260A1
Authority
WO
WIPO (PCT)
Prior art keywords
focusing
lens
projection
parameter
focus
Prior art date
Application number
PCT/CN2018/071434
Other languages
English (en)
French (fr)
Inventor
刘其阳
韩运起
闵岚
李屹
Original Assignee
深圳光峰科技股份有限公司
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 深圳光峰科技股份有限公司 filed Critical 深圳光峰科技股份有限公司
Publication of WO2019085260A1 publication Critical patent/WO2019085260A1/zh

Links

Images

Classifications

    • 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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]

Definitions

  • the present invention relates to the field of projection display, and in particular to an automatic focusing system, method and projection apparatus.
  • a projection lens is used to take a picture of a projection screen projected on the screen.
  • the output image of the obtained projection effect is compared with the theoretical input image, and then the optimal focal length position of the projection lens is determined. Then adjust it to zero within the zoom range of the lens and then adjust to the best position you have obtained.
  • an infrared light source is used to emit an infrared spot on the projection screen
  • an infrared detection module is used to detect the spot image
  • a control signal is sent to the focus motor to adjust the lens group to a suitable one.
  • the technical problem to be solved by the present invention is to provide an automatic focusing method, system and projection device, which can realize autofocus quickly, has good reliability, and has a good user experience.
  • a technical solution adopted by the present invention is to provide an automatic focusing system applied to a projection system having a projection lens, including:
  • a temperature sensor unit for measuring a real-time temperature parameter of the projection system
  • a distance sensor unit for measuring a distance parameter between the projection lens and the projection screen
  • a focus lens for adjusting the focal length of the projection system within a focus range
  • a storage module configured to store a temperature parameter, a distance parameter, and a preset value of a lens position parameter of the focus lens corresponding to a focal length at different temperatures and different distances;
  • control processing module is configured to read the measured values of the temperature sensing unit and the distance sensing unit and compare the measured value with a preset value of the parameter information stored by the storage module to determine The lens position of the focus lens corresponding to the focal length in the current environment;
  • the focusing module is configured to accept a control signal sent by the control processing module, adjust a lens position corresponding to the focal length of the focusing lens, and obtain a lens position parameter of the focusing lens.
  • the storage module further includes pre-set image information
  • the auto-focusing system further includes an image acquisition module for acquiring a real-time projection image
  • the control processing module passes the projection image and the storage module.
  • the preset image information is compared to determine whether the projected image achieves the best effect.
  • the distance sensor unit comprises at least one distance sensor, and the distance sensor is any one or more of an infrared sensor, an ultrasonic sensor, a laser distance sensor or a radar distance sensor.
  • the projection system comprises a projection screen, a projector housing, a projection lens and a light machine
  • the temperature sensing unit comprises a temperature sensor disposed on any one or more of a projector housing, a light machine or a projection lens.
  • the focusing module comprises a focusing motor that drives the focusing lens to move in the optical axis direction.
  • the focus motor is a stepper motor, or a motor including at least one displacement sensor, such that the control processing module can obtain feedback of lens position parameters.
  • another technical solution adopted by the present invention is to provide a projection apparatus including the automatic focusing system as described above.
  • another technical solution adopted by the present invention is to provide an automatic focusing method using the automatic focusing system as described above, the automatic focusing method comprising the following steps:
  • S1 acquiring a real-time temperature parameter of the projection system, a distance parameter between the projection lens and the projection screen, and a measured value of a position parameter of the current focus lens;
  • step S2 Comparing the measured value obtained in step S1 with the preset value. If the measured value does not match the preset value, it is determined that the focus adjustment is needed, and the process proceeds to step S3; if the measured value is consistent with the preset value, it is determined that it is unnecessary. Focusing, proceeding to step S0 to end the focusing process;
  • S3 determining, according to the temperature parameter acquired by S1 and the measured value of the distance parameter, a preset value of a lens position where the focus lens matched with the current measured value is located;
  • step S4 the focusing module controls the focus lens to move to the lens position determined in step S3;
  • the method further comprises the step S5: returning to the step S1 to repeat the focusing process after a fixed time interval.
  • the method further includes the step S6: monitoring whether the relevant parameter has a change; if the parameter change is detected, determining that the focus adjustment is needed, returning to step S1 to repeat the focusing process; if the parameter change is not detected, determining that the parameter is not required to be renewed Focusing, return to step S5.
  • step S7 is further included: acquiring a real-time projection image, comparing the acquired projection image with preset image information or an input signal, and determining whether the projection image achieves an optimal projection effect, and if the determination is yes , proceed to step S5; if the determination is no, proceed to step S8;
  • the automatic focusing system includes a temperature sensing unit, a distance sensing unit, a focusing lens, and a tuning device, which are different from the prior art.
  • the focus module, the storage module and the control processing module, the control processing module determines whether the focus needs to be adjusted by comparing the measured value of the temperature sensing unit and the distance sensing unit with the preset value; when the focus is needed, reading the storage module
  • the preset value determines the lens position where the focus lens should be, and controls the focus module to drive the focus lens to the corresponding lens position to complete the focus adjustment.
  • the auto-focusing system of the invention can automatically determine whether focus adjustment is needed and achieve fast and accurate focusing, high reliability and good user experience.
  • FIG. 1 is a schematic structural view of an automatic focusing system of the present invention
  • FIG. 2 is a schematic flow chart of an automatic focusing method of the present invention
  • FIG. 3 is a schematic flow chart of another embodiment of the auto-focusing method of the present invention.
  • FIG. 4 is a schematic structural view of a further improved autofocus system of the present invention.
  • FIG. 5 is a schematic flow chart of the further improvement of the auto-focusing method of the present invention.
  • the invention provides an automatic focusing method, a system and a projection device.
  • the automatic focusing system of the invention is applied to a projection system in a projection device.
  • the projection system is composed of a projection screen and a projector.
  • the projector comprises a projector housing and is fixed in the projection.
  • the projection screen can be a projection screen, a wall, a building exterior wall surface, or a water curtain or any other place where an image can be projected.
  • the image generated by the optical machine is imaged on the projection screen through the projection lens, and is automatically adjusted by the automatic focusing system of the invention to ensure the optimal projection effect of the projected image.
  • the autofocus system of the present invention comprises a temperature sensing unit 1, a distance sensing unit 2, a storage module 3, a control processing module 4, a focusing module 5 and a focusing lens 6.
  • the storage module 4 stores a preset temperature parameter, a distance parameter, and a preset value of a lens position parameter of the focus lens corresponding to a focal length at different temperatures and different distances, and the temperature sensing unit 1 is configured to acquire a temperature measurement value.
  • the distance sensing unit 2 is used to acquire distance measurement values. Through the temperature measurement value and the distance measurement value, the preset value in the storage module is retrieved and compared, and the current focal length position, that is, the lens position at which the current focus lens should be located, can be obtained.
  • the automatic focusing method provided by the present invention applies the above-mentioned automatic focusing system, and the control processing module acquires the measured values of the temperature sensing unit 1 and the distance sensing unit 2 while reading the preset value stored by the storage module 3; The comparison of the preset values determines whether the focus adjustment is needed; when the focus adjustment is needed, the lens position at which the focus lens 6 should be located is determined by reading the preset value of the storage module 3, and the focus adjustment module 5 is controlled to drive the focus lens 6 Focus is adjusted to the corresponding lens position.
  • the auto-focusing system and method of the present invention are mainly applied to a projection device that is just turned on for an initial focusing process.
  • the auto-focusing system includes a temperature sensing unit 1, a distance sensing unit 2, a storage module 3, a control processing module 4, a focusing module 5, and a focusing lens 6.
  • the temperature sensing unit 1 is a temperature sensor for measuring the real-time temperature parameter of the projection system, preferably a real-time temperature parameter for measuring the projector.
  • the temperature sensor can be placed on any of the projector's optomechanical, projection lens or projector housing.
  • the temperature sensor can be one or more. When there are multiple temperature sensors, they can be set separately on different parts of the projector. In this way, measurement errors can be further avoided and the accuracy of obtaining temperature measurements can be increased.
  • the distance sensor unit 2 is at least one distance sensor for measuring a distance parameter between the projection lens and the projection screen.
  • the distance sensor is any one or more of an infrared sensor, an ultrasonic sensor, a laser distance sensor, or a radar distance sensor.
  • a plurality of distance sensors can be used to increase the accuracy of the measured values and avoid errors.
  • a plurality of distance sensors can be either the same type of distance sensor or different types of distance sensors, all of which can achieve the object of the present invention.
  • the storage module 3 presets a preset value in which various parameter information is stored. Specifically, in the embodiment, the storage module 3 stores at least a temperature parameter, a distance parameter, and a focus lens corresponding to a focal length at different temperatures and different distances.
  • the preset value of the lens position parameter is as follows:
  • Table 1 The correspondence of Table 1 is previously input and stored in the storage module 3 for controlling the retrieval and matching matching of the processing module 4.
  • Each row in Table 1 corresponds to a different working environment, and each working environment corresponds to an optimal lens position M.
  • the storage module may also store other parameter information related to the auto focus system.
  • the present invention may further include other parameter sensors 7 for detecting parameter values of the projection system in different states to further ensure fast and accurate auto-focusing, and to monitor the working state of the projection system.
  • the storage module 3 may be integrated with the control processing module 4, or may be separately provided, and communicated with the control processing module 4 through electrical connection.
  • the control processing module 4 is electrically connected to the temperature sensing unit 1, the distance sensing unit 2, the storage module 3, and the focusing module 5, respectively, and implements signal communication.
  • the control processing module 4 can read the preset values stored in the storage module 3.
  • the measured values measured by the temperature sensing unit 1 and the distance sensing unit 2 are also input to the control processing module 4 by means of an electrical signal, and the control processing module 4 retrieves the measured values of the temperature sensing unit 1 and the distance sensing unit 2 and measures The value is compared with a preset value of the parameter information stored in the storage module 3 to determine the lens position of the focus lens corresponding to the focal length in the current environment.
  • control processing module 4 determines the lens position M corresponding to the optimal projection effect according to the corresponding relationship in Table 1 through the measured values of the temperature sensing unit 1 and the distance sensing unit 2, and controls the focusing module 5 to focus the lens 6 Autofocus is achieved at the corresponding position M of the moving lens.
  • the focusing module 5 includes a focus motor that receives a control signal from the control processing module 4 and drives the focus lens to move in the optical axis direction.
  • the focusing module is a stepping motor or a motor including at least one displacement sensor, such that the control processing module can acquire feedback of lens position parameters. In this way, a more precise positional movement can be achieved.
  • the use of the displacement sensor can avoid the phenomenon of "slip step" of the motor, that is, the actual rotation angle of the motor is insufficient, which is smaller than the angle that should be rotated theoretically under the control signal control, so that the error of the positional movement can be avoided.
  • the displacement sensor is preferably an AD sensor, and the distance at which the stepping motor rotates is determined by reading the resistance value of the corresponding position of the progressive motor.
  • the feedback input control processing module 4 of the lens position parameter obtained by the displacement sensor adjusts the size of the control signal for the focusing module 5 according to the feedback signal to realize further automatic focusing, so that the focusing process is more rapid and efficient.
  • the focusing module 5 may also include other sensors capable of acquiring lens position parameters, and is not limited to the displacement sensor. Referring to FIG. 2, the auto focus method of the present invention includes the following steps:
  • S1 acquiring a real-time temperature parameter of the projection system, a distance parameter between the projection lens and the projection screen, and a measurement value of a position parameter of the current focus lens through the temperature sensing unit 1, the distance sensing unit 2, and other parameter sensors 7;
  • step S2 Comparing the measured value obtained in step S1 with the preset value in Table 1. If the measured value does not match the preset value in Table 1, it is determined that the focus adjustment is needed, and the process proceeds to step S3; if the measured value and the table 1 The preset values in the same are determined, that is, it is determined that no focusing is required, and the step S0 is ended to end the focusing process;
  • the table 1 determines a preset value of the lens position where the focusing lens matches the current measured value
  • step S4 the focusing module 5 controls the focus lens 6 to move to the lens position determined in step S3;
  • the above automatic focusing method is mainly applied to the initial focusing process of the projection device just starting up. Read the current environmental parameters through the auto-focusing system, quickly determine the lens position where the focusing lens should be located, and control the focusing module to drive the focusing lens to reach the optimal lens position to achieve the initial auto-focusing.
  • the focusing process is simple, fast and reliable. high.
  • the relevant parameters may change with external changes or self-operation, so that the projected image changes accordingly. Therefore, real-time modulation of the focal length of the lens is required.
  • the change of the parameters generally includes the following two cases: 1. The change of the temperature parameter, and the relevant parameters of the lens which are affected thereby; the so-called running focus. 2. Unexpected vibration has occurred, causing subtle changes in the mechanical structure of the projector, and the resulting effect of the projected image is deteriorated.
  • the present embodiment is a further improvement for the above situation on the basis of the foregoing content.
  • a cycle step is added, and the focusing process is repeated every time after a certain time interval, or The focusing process is started again after detecting changes in the external environment. In this way, real-time modulation of the projection system can be achieved, and the focus adjustment result can be repeatedly verified.
  • the specific auto focus method includes the following steps:
  • S1 acquiring a real-time temperature parameter of the projection system, a distance parameter between the projection lens and the projection screen, and a measurement value of a position parameter of the current focus lens through the temperature sensing unit 1, the distance sensing unit 2, and other parameter sensors 7;
  • step S2 Comparing the measured value obtained in step S1 with the preset value in Table 1. If the measured value does not match the preset value, it is determined that the focus adjustment is needed, and the process proceeds to step S3; if the measured value is consistent with the preset value, It is judged that no focusing is required, and the focusing process is ended;
  • the table 1 determines a preset value of the lens position where the focusing lens matches the current measured value
  • step S4 the focusing module controls the focus lens to move to the lens position determined in step S3;
  • step S6 monitoring the relevant parameter through the temperature sensing unit 1, the distance sensing unit 2 and other parameter sensors 7; if the parameter change is detected, it is determined that the focus adjustment is needed, and the process returns to step S1 to repeat the focusing process; When a parameter change is detected, it is determined that refocusing is not required, and the process returns to step S5 or S0.
  • step S5 and step S6 have no sequence, and not both steps must be performed, that is, after a fixed time or a change in related parameters is detected, the two can satisfy the one, that is, the repeat focusing process can be started. After a repeated focusing process, after a fixed time or again detecting the relevant parameter changes, the repeated focusing is started again, so that the real-time modulation of the auto-focusing system can be realized to ensure that the projected image always maintains the best projection effect.
  • step S5 may not be performed, that is, real-time modulation at a fixed time is not performed, and only initial modulation is implemented.
  • step S6 When a parameter change satisfying S6 occurs, secondary focusing of the correcting property is performed, and then returning to S0 to end focusing, Achieving the object of the present invention.
  • the auto focus system of the present embodiment further includes an image acquisition module 8.
  • image information set in advance is also stored in the storage module 3.
  • the image acquisition module 8 is configured to detect a projection image on the projection screen, and input the detection result into the control processing module 4, and the control processing module 4 compares the projection image with the image information preset in the storage module to determine whether the projection image is optimal. effect.
  • the preset image information may also be determined by the input signal of the image, that is, the difference between the input signal and the actual projected image is determined, and whether Is the best result.
  • the autofocus method of the present embodiment further includes a step of detecting a projected image, determining whether it is in an optimal projection effect, and performing secondary focusing.
  • the specific auto focus method includes the following steps:
  • S1 acquiring a real-time temperature parameter of the projection system, a distance parameter between the projection lens and the projection screen, and a measurement value of a position parameter of the current focus lens through the temperature sensing unit 1, the distance sensing unit 2, and other parameter sensors 7;
  • step S2 Comparing the measured value obtained in step S1 with the preset value in Table 1. If the measured value does not match the preset value, it is determined that the focus adjustment is needed, and the process proceeds to step S3; if the measured value is consistent with the preset value, It is determined that no focusing is required, and the step S0 is ended to end the focusing process;
  • the table 1 determines a preset value of the lens position where the focusing lens matches the current measured value
  • step S4 the focusing module controls the focus lens to move to the lens position determined in step S3;
  • step S7 determining whether the projected image achieves the best projection effect, if the determination is yes, then proceeds to step S0 or S5; if the determination is no, then proceeds to step S8;
  • the determining method of step S7 may obtain a real-time projected image through the image acquiring module, and compare the acquired projected image with the preset image information in the storage module; or may determine by determining the difference between the input signal and the actual projected image.
  • the third embodiment can be improved on the basis of the first embodiment, or can be improved on the basis of the second embodiment. That is, after determining that the optimal projection effect has been entered in step S7, the process returns to step S0, the focusing process is ended, and the initial adjustment of the projection device is realized; or the process returns to step S5 to further perform real-time real-time modulation.
  • the method for re-determining the optimal lens position in step S8 may specifically move the lens at the corresponding position, and take a real-time projection image, and compare the preset image information to determine whether it is the optimal position. If the output input image is consistent, then The position is the best lens position to be re-determined.
  • the moving lens can be unidirectional or bidirectional, preferably bidirectional. After the optimal lens position of the lens is re-determined, it is stored in the corresponding storage unit of the storage module 3, and covers the parameters of the original lens position in the storage unit for the next retrieval.
  • the real-time correction of the optimal lens position and the corresponding parameters corresponding thereto is realized, so that the correspondence between the optimal lens position and the related parameters stored in the storage unit is in an optimal correspondence relationship in real time; it is convenient for the next focusing process.
  • Directly realize the optimal position of the lens further reduce the judgment and adjustment process and steps, further improve the efficiency of auto-focusing, shorten the auto-focusing time, and further improve the user experience.
  • the focusing process can be verified to ensure the accuracy of the focusing, ensure that the projected image is in the best projection effect, and improve product performance.
  • the automatic focusing system includes a temperature sensing unit, a distance sensing unit, a focusing lens, and a tuning device, which are different from the prior art.
  • the focus module, the storage module and the control processing module, the control processing module determines whether the focus needs to be adjusted by comparing the measured value of the temperature sensing unit and the distance sensing unit with the preset value; when the focus is needed, reading the storage module
  • the preset value determines the lens position where the focus lens should be, and controls the focus module to drive the focus lens to the corresponding lens position to complete the focus adjustment.
  • the auto-focusing system of the invention can automatically determine whether focus adjustment is needed and achieve fast and accurate focusing, high reliability and good user experience.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

一种自动调焦系统、方法以及投影设备，自动调焦系统包括温度传感单元（1）、距离传感单元（2）、调焦镜头（6）、调焦模块（5）、存储模块（3）和控制处理模块（4），控制处理模块（4）通过温度传感单元（1）、距离传感单元（2）的测量值与预设值的比对判断是否需要调焦；在需要调焦时，通过读取存储模块（3）的预设值确定调焦镜头（6）应该处于的镜头位置，并控制调焦模块（5）带动调焦镜头（6）到相应镜头位置完成调焦。这一自动调焦系统可以自动判断是否需要调焦并实现快速准确地调焦，可靠性高，具有良好的用户体验。

Description

自动调焦系统、方法以及投影设备 技术领域
本发明涉及投影显示领域，尤其是涉及一种自动调焦系统、方法以及投影设备。
背景技术
传统的投影仪多是采用手动调焦的方式，但也有一些新的投影仪具有自动调焦功能，例如，在专利号为201510041467.5的发明专利中，采用拍摄镜头对投射在屏幕上的投影画面拍照，获得的投射效果的输出图像同理论的输入图像进行比较，然后确定投影镜头的最佳的焦距位置。接着在镜头的可变焦距范围内将其调至零点，然后再调整至已获得的最佳位置处。再比如，在专利号为201220730223.X的发明专利中，采用红外光源发出红外光斑于投影屏幕上，用红外检测模组检测光斑图像，通过向调焦马达发出控制信号，调整镜片组到合适的位置，达到自动调焦的效果。然而，上述方案中自动调焦的过程都相对复杂。不利于快速调焦，在整个使用过程所耗费的时间较长，且此过程中都需要使调焦镜头返回远点，从而导致投影画面完全模糊，用户完全无法观看投影画面；会影响投影机使用过程中的用户体验。
因此，实有必要提供一种新的自动调焦系统及检测方法以及投影设备以解决上述问题。
发明内容
本发明主要解决的技术问题是提供一种自动调焦方法、系统以及投影设备，能够快速实现自动对焦，可靠性好，具有良好的用户体验。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种自动调焦系统，其应用于具有投影镜头的投影系统，包括：
温度传感器单元，用于测量投影系统的实时温度参数；
距离传感器单元，用于测量投影镜头到投影屏幕间的距离参数；
调焦镜头，用于在调焦范围内调整投影系统的焦距；
存储模块，用于存储温度参数、距离参数和在不同温度不同距离下的焦距对应的调焦镜头的镜头位置参数的预设值；
控制处理模块，所述控制处理模块用于读取所述温度传感单元和所述距离传感单元的测量值并将测量值与所述存储模块存储的参数信息的预设值比对以确定当前环境下焦距所对应的调焦镜头的镜头位置；
调焦模块，用于接受所述控制处理模块发出的控制信号，调整调焦镜头到焦距所对应的镜头位置，以及获取调焦镜头的镜头位置参数。
优选的，所述存储模块内还存储有预先设置的图像信息，所述自动调焦系统还包括用于获取实时的投影图像的图像获取模块，所述控制处理模块通过所述投影图像与存储模块内预先设置的图像信息进行比对判断投影图像是否达到最佳效果。
优选的，所述距离传感器单元包括至少一个距离传感器，所述距离传感器为红外传感器、超声传感器、激光距离传感器或雷达距离传感器中的任意一种或多种。
优选的，所述投影系统包括投影屏幕，投影机外壳，投影镜头和光机，所述温度传感单元包括设置在投影机外壳、光机或投影镜头中的任意一个或多个上的温度传感器。
优选的，所述调焦模块包括驱动所述调焦镜头沿光轴方向移动的调焦马达。
优选的，所述调焦马达为步进电机，或包括至少一个位移传感器的电机，使得所述控制处理模块能够获取镜头位置参数的反馈。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种投影设备，包括如上所述的自动调焦系统。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种自动调焦方法，采用如上所述的自动调焦系统，所述自动调焦方法包括如下步骤：
S1：获取投影系统的实时温度参数、投影镜头到投影屏幕间的距离参数、以及当前调焦镜头所在位置参数的测量值；
S2：将步骤S1获取的测量值与预设值比对，若测量值与预设值不一致，即判断为需要调焦，进入步骤S3；若测量值与预设值一致，即判断为不需要调焦，进入步骤S0结束此次调焦过程；
S3：根据S1获取的温度参数和距离参数的测量值确定与当前测量值相匹配的调焦镜头所在的镜头位置的预设值；
S4：调焦模块控制调焦镜头移动至步骤S3确定的镜头位置；
S0：结束本次调焦。
优选的，进一步包括步骤S5：经过固定时间间隔返回步骤S1重复调焦过程。
优选的，进一步包括步骤S6：监测相关参数是否有变化；若检测到参数变化，则判定为需要重新调焦，返回步骤S1重复调焦过程；若未检测到参数变化，则判定为不需要重新调焦，返回步骤S5。
优选的，在步骤S4后进一步包括步骤S7：获取实时的投影图像，将获取的投影图像与预设的图像信息或输入信号进行比对，判断投影图像是否达到最佳投影效果，若判定为是，则进入步骤S5；若判定为否，则进入步骤S8；
S8：重新确定在对应参数下的调焦镜头的最佳镜头位置，存储并替换掉对应参数下的最佳镜头位置信息，重新进入步骤S4。
本发明的有益效果是：区别于现有技术的情况，本发明提供一种自动调焦系统、方法以及投影设备，自动调焦系统包括温度传感单元、距离传感单元、调焦镜头、调焦模块、存储模块和控制处理模块，控制处理模块通过温度传感单元、距离传感单元的测量值与预设值的比对判断是否需要调焦；在需要调焦时，通过读取存储模块的预设值确定调焦镜头应该处于的镜头位置，并控制调焦模块带动调焦镜头到相应镜头位置完成调焦。本发明自动调焦系统可以自动判断是否需要调焦并实现快速准确地调焦，可靠性高，具有良好的用户体验。
附图说明
图1是本发明自动调焦系统的结构示意图；
图2是本发明自动调焦方法的流程示意图；
图3是本发明自动调焦方法另一种实施方式的流程示意图；
图4是本发明自动调焦系统进一步改进后的结构示意图；
图5是本发明自动调焦方法进一步改进后的流程示意图。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明提供一种自动调焦方法、系统以及投影设备，本发明自动调焦系统应用于投影设备中的投影系统，投影系统由投影屏幕和投影机组成，投影机包括投影机外壳以及固定在投影机外壳上的投影镜头和光机。投影屏幕可以是投影幕布、墙体、建筑物外墙面、还可以为水幕等任何可以投射图像的地方。光机产生图像经过投影镜头汇聚在投影屏幕上成像，并通过本发明自动调焦系统实现自动调焦，保证投影图像达到最佳投影效果。
本发明自动调焦系统包括温度传感单元1、距离传感单元2、存储模块3、控制处理模块4、调焦模块5和调焦镜头6。其中存储模块4内存储有预先设置的温度参数、距离参数以及在不同温度不同距离下的焦距对应的调焦镜头的镜头位置参数的预设值，温度传感单元1用于获取温度测量值，距离传感单元2用于获取距离测量值。通过温度测量值和距离测量值，调取并对比存储模块中的预设值，可以获得当前焦距位置，即当前调焦镜头应该处于的镜头位置。
本发明提供的自动调焦方法即应用上述自动调焦系统，控制处理模块获取温度传感单元1、距离传感单元2的测量值同时读取存储模块3存储的预设值；通过测量值与预设值的比对判断是否需要调焦；在需要调焦时，通过读取存储模块3的预设值确定调焦镜头6应该处于的镜头位置，并控制调焦模块5带动调焦镜头6到相应镜头位置完成调焦。
下面将结合附图和具体实施方式进行进一步说明：
请参阅图1，本发明的自动调焦系统和方法主要应用于投影设备刚开机进行初始调焦过程。
自动调焦系统包括温度传感单元1、距离传感单元2、存储模块3、控制处理模块4、调焦模块5和调焦镜头6。
温度传感单元1为温度传感器，用于测量投影系统的实时温度参数，优选的，为用于测量投影机的实时温度参数。温度传感器可以设置在投影机的光机、投影镜头或投影机外壳中的任意一个上。温度传感器既可以为一个，也可以为多个，当温度传感器为多个时，可以分别设置在投影机的不同部位上。这样，可以进一步避免测量误差，增加获取温度测量值的精确性。
距离传感器单元2为至少一个距离传感器，用于测量投影镜头到投影屏幕间的距离参数。具体的，距离传感器为红外传感器、超声传感器、激光距离传感器或雷达距离传感器中的任意一种或多种。优选的，可以采用多个距离传感器用于提高测量值的精确性，避免误差。多个距离传感器既可以为同类型的距离传感器，也可以为不同类型的距离传感器，均是可以实现本发明的目的的。
存储模块3预先设置存储有各种参数信息的预设值，具体在本实施方式中，存储模块3至少存储有温度参数、距离参数、以及在不同温度不同距离下的焦距对应的调焦镜头的镜头位置参数的预设值。在本实施方式中，相应参数的对应关系参见下表：
Figure PCTCN2018071434-appb-000001
Figure PCTCN2018071434-appb-000002
表1
表1的对应关系预先输入并存储在存储模块3中用于控制处理模块4的调取和对照匹配。表1中每一行分别对应不同的工作环境，每种工作环境对应一个最佳镜头位置M，当调焦镜头处于最佳镜头位置M时，此时投影系统的焦点落在投影屏幕上，投影图像的效果呈现最佳状态。在可选择的其他实施方式中，存储模块也可以存储有与自动调焦系统相关的其他参数信息。对应的，本发明还可以包括其他参数传感器7，用于检测投影系统在不同状态下的参数值，以进一步确保自动调焦的快速和准确，并可以起到对投影系统工作状态的监控作用。
存储模块3可以与控制处理模块4集成在一起，也可以单独设置，并与控制处理模块4之间通过电性连接实现信号通信。
控制处理模块4分别与温度传感单元1、距离传感单元2、存储模块3、和调焦模块5电性连接并实现信号通信。控制处理模块4可以读取存储模块3中存储的预设值。温度传感单元1和距离传感单元2测量的测量值也通过电信号的形式输入控制处理模块4，控制处理模块4调取温度传感单元1和距离传感单元2的测量值并将测量值与存储模块3中存储的参数信息的预设值比对以确定当前环境下焦距所对应的调焦镜头的镜头位置。即控制处理模块4通过温度传感单元1和距离传感单元2的测量值，根据表1中的对应关系确定最佳投影效果所对应的镜头位置M并控制调焦模块5将调焦镜头6移动的镜头相应的位置M处实 现自动调焦。
调焦模块5包括接受控制处理模块4的控制信号，驱动调焦镜头沿光轴方向移动的调焦马达。优选的，调焦模块为步进电机或包括至少一个位移传感器的电机，使得所述控制处理模块能够获取镜头位置参数的反馈。这样，可以实现较为精确的位置移动。使用位移传感器可以避免电机出现“滑步”现象，即电机的实际转动角度不足，小于控制信号控制下理论上应转动的角度，从而可以避免位置移动的误差。位移传感器优选为AD传感器，通过读取进步电机对应位置的电阻值确定步进电机转动的距离。位移传感器得到的镜头位置参数的反馈输入控制处理模块4，控制处理模块4根据该反馈信号调整对于调焦模块5的控制信号的大小，实现进一步的自动化调焦，使调焦过程更迅速，高效。当然，调焦模块5还可以包括能够获取镜头位置参数的其他传感器，并不局限于位移传感器。参照图2所示，本发明的自动调焦方法包括如下步骤：
S1：通过温度传感单元1、距离传感单元2和其他参数传感器7获取投影系统的实时温度参数、投影镜头到投影屏幕间的距离参数、以及当前调焦镜头所在位置参数的测量值；
S2：将步骤S1获取的测量值与表1中的预设值比对，若测量值与表1中的预设值不一致，即判断为需要调焦，进入步骤S3；若测量值与表1中的预设值一致，即判断为不需要调焦，进入步骤S0结束此次调焦过程；
S3：根据S1获取的温度参数和距离参数的测量值查找表1确定与当前测量值相匹配的调焦镜头所在的镜头位置的预设值；
S4：调焦模块5控制调焦镜头6移动至步骤S3确定的镜头位置；
S0：完成本次调焦。
上述自动调焦方法主要应用于投影设备刚开机进行初始调焦过程。通过自动调焦系统读取当前环境参数，快速确定调焦镜头应处于的镜头位置并控制调焦模块驱动调焦镜头到达最优镜头位置实现初始化的自动调焦，调焦过程简便快速且可靠性高。
此外，投影设备或投影系统在使用过程中，相关的参数会随着外界变化或自身运行而发生变化，使得投影图像随之产生变化。因此需要对镜头焦距进行实时的调制。参数的变化一般包括如下两种情况：1、温度参数的变化，由此会影响的镜头的相关参数；即所谓的跑焦。2、产生了意外的震动，使得投影机相关机械结构发生了细微的变化，由此引起的投影图像的效果变差。
如图3所示，本实施方式为在前述内容的基础上针对上述情况进行的进一步改进，在本实施方式的自动调焦方法增加一循环步骤，每间隔一定时间后重复启动调焦过程，或在检测到外界环境变动后再次启动调焦过程。这样，可以实现投影系统的实时调制，也可以对调焦结果进行重复验证。
具体的自动调焦方法包括如下步骤：
S1：通过温度传感单元1、距离传感单元2和其他参数传感器7获取投影系统的实时温度参数、投影镜头到投影屏幕间的距离参数、以及当前调焦镜头所在位置参数的测量值；
S2：将步骤S1获取的测量值与表1中的预设值比对，若测量值与预设值不一致，即判断为需要调焦，进入步骤S3；若测量值与预设值一致，即判断为不需要调焦，结束此次调焦过程；
S3：根据S1获取的温度参数和距离参数的测量值查找表1确定与当前测量值相匹配的调焦镜头所在的镜头位置的预设值；
S4：调焦模块控制调焦镜头移动至步骤S3确定的镜头位置；
S5：经过预先设定的固定时间间隔返回步骤S1重复调焦过程；
S6：通过温度传感单元1、距离传感单元2和其他参数传感器7监测相关参数是否有变化；若检测到参数变化，则判定为需要重新调焦，返回步骤S1重复调焦过程；若未检测到参数变化，则判定为不需要重新调焦，返回步骤S5或S0。
需要说明的是，步骤S5和步骤S6没有前后顺序，也并不是两个步骤必须全部进行，即，经过固定时间或检测到相关参数变化，二者满足 其一即可以启动重复调焦过程。经过一次重复调焦过程后，经过固定时间或再次检测到相关参数变动后，再次启动重复调焦，这样，可以实现自动调焦系统的实时调制，保证投影图像一直保持最佳投影效果。
当然，也可以不进行步骤S5，即不实行固定时间的实时调制，仅实现初始调制，当出现满足S6的参数变化时，进行纠偏性质的二次调焦，之后返回S0结束调焦，也是可以达到本发明目的的。
如图4和图5所示，为在前述内容的基础上进行的进一步改进，本实施方式的自动调焦系统，进一步包括图像获取模块8。
如图4所示，本实施方式中，存储模块3内还存储有预先设置的图像信息。图像获取模块8用于检测投影屏幕上的投影图像，并将检测结果输入控制处理模块4，控制处理模块4通过投影图像与存储模块内预先设置的图像信息进行比对判断投影图像是否达到最佳效果。当然，这仅是一种较优的实施方式，在可选择的其他实施方式中，预先设置的图像信息也可以是由图像的输入信号确定，即判断输入信号与实际投射图像的差异，判断是否是最佳效果。
如图5所示，本实施方式的自动调焦方法进一步包括一检测投影图像，确定是否处于最佳投影效果，并进行二次调焦的步骤。
具体的自动调焦方法包括如下步骤：
S1：通过温度传感单元1、距离传感单元2和其他参数传感器7获取投影系统的实时温度参数、投影镜头到投影屏幕间的距离参数、以及当前调焦镜头所在位置参数的测量值；
S2：将步骤S1获取的测量值与表1中的预设值比对，若测量值与预设值不一致，即判断为需要调焦，进入步骤S3；若测量值与预设值一致，即判断为不需要调焦，进入步骤S0结束此次调焦过程；
S3：根据S1获取的温度参数和距离参数的测量值查找表1确定与当前测量值相匹配的调焦镜头所在的镜头位置的预设值；
S4：调焦模块控制调焦镜头移动至步骤S3确定的镜头位置；
S7：判断投影图像是否达到最佳投影效果，若判定为是，则进入步 骤S0或S5；若判定为否，则进入步骤S8；
其中步骤S7的判断方法可以通过图像获取模块获取实时的投影图像，并将获取的投影图像与存储模块中的预设图像信息比对；也可以通过判断输入信号与实际投射图像的差异来判断。
S8：重新确定在对应参数下的调焦镜头的最佳镜头位置，并在存储模块中存储并替换掉对应参数下的镜头位置信息，重新进入步骤S4。
需要说明的是，实施例三既可以为在实施例一的基础上进行改进，也可以为在实施例二的基础上进行的改进。即步骤S7中确定已经进入最佳投影效果后，既返回步骤S0，结束调焦过程，实现投影设备的初始化调焦；也可以返回步骤S5，进一步进行实时的实时调制。
步骤S8中重新确定最佳镜头位置的方法具体可以为在对应位置移动镜头，并拍摄实时的投影图像，并对比预设图像信息，以确定是否是最佳位置，若输出输入图像一致，则此位置为重新确定的最佳镜头位置。其中移动镜头可以单向、也可双向，优选双向。当重新确定镜头的最佳镜头位置后，存储在存储模块3的相应存储单元，并覆盖该存储单元中原有的镜头位置的参数以便于下一次调取。由此，实现对最佳镜头位置和与其对应的相关参数的实时修正，使得存储在存储单元中的最佳镜头位置与相关参数的对应关系实时处于最佳的对应关系；便于在下一次调焦过程中直接实现镜头的最佳位置，进一步减少判断、调整过程和步骤，进一步提高自动调焦的效率、缩短自动调焦时间，进一步提高用户体验。
通过对投影图像与预设图像信息比对，可以调焦过程进行验证，确保调焦的准确性，保证投影图像处于最佳投影效果，提高产品性能。
本发明的有益效果是：区别于现有技术的情况，本发明提供一种自动调焦系统、方法以及投影设备，自动调焦系统包括温度传感单元、距离传感单元、调焦镜头、调焦模块、存储模块和控制处理模块，控制处理模块通过温度传感单元、距离传感单元的测量值与预设值的比对判断是否需要调焦；在需要调焦时，通过读取存储模块的预设值确定调焦镜头应该处于的镜头位置，并控制调焦模块带动调焦镜头到相应镜头位置 完成调焦。本发明自动调焦系统可以自动判断是否需要调焦并实现快速准确地调焦，可靠性高，具有良好的用户体验。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (11)

  1. 一种自动调焦系统，其应用于具有投影镜头的投影系统，其特征在于，包括：
    温度传感器单元，用于测量投影系统的实时温度参数；
    距离传感器单元，用于测量投影镜头到投影屏幕间的距离参数；
    调焦镜头，用于在调焦范围内调整投影系统的焦距；
    存储模块，用于存储温度参数、距离参数和在不同温度不同距离下的焦距对应的调焦镜头的镜头位置参数的预设值；
    控制处理模块，所述控制处理模块用于读取所述温度传感单元和所述距离传感单元的测量值并将测量值与所述存储模块存储的参数信息的预设值比对以确定当前环境下焦距所对应的调焦镜头的镜头位置；
    调焦模块，用于接受所述控制处理模块发出的控制信号，调整调焦镜头到焦距所对应的镜头位置，以及获取调焦镜头的镜头位置参数。
  2. 根据权利要求1所述的自动调焦系统，其特征在于，所述存储模块内还存储有预先设置的图像信息，所述自动调焦系统还包括用于获取实时的投影图像的图像获取模块，所述控制处理模块通过所述投影图像与存储模块内预先设置的图像信息进行比对判断投影图像是否达到最佳效果。
  3. 根据权利要求1所述的自动调焦系统，其特征在于，所述距离传感器单元包括至少一个距离传感器，所述距离传感器为红外传感器、超声传感器、激光距离传感器或雷达距离传感器中的任意一种或多种。
  4. 根据权利要求1所述的自动调焦系统，其特征在于，所述投影系统包括投影机外壳，投影镜头和光机，所述温度传感单元包括设置在投影机外壳、光机或投影镜头中的任意一个或多个上的温度传感器。
  5. 根据权利要求1所述的自动调焦系统，其特征在于，所述调焦模块包括驱动所述投影镜头沿光轴方向移动的调焦马达。
  6. 根据权利要求5所述的自动调焦系统，其特征在于，所述调焦马达为步进电机，或包括至少一个位移传感器的电机，使得所述控制处理 模块能够获取镜头位置参数的反馈。
  7. 一种投影设备，其特征在于，包括如权利要求1到6中任意一种所述的自动调焦系统。
  8. 一种自动调焦方法，其特征在于，采用如权利要求1到6任意一项所述的自动调焦系统，所述自动调焦方法包括如下步骤：
    S1：获取投影系统的实时温度参数、投影镜头到投影屏幕间的距离参数、以及当前调焦镜头所在位置参数的测量值；
    S2：将步骤S1获取的测量值与预设值比对，若测量值与预设值不一致，即判断为需要调焦，进入步骤S3；若测量值与预设值一致，即判断为不需要调焦，进入步骤S0结束此次调焦过程；
    S3：根据S1获取的温度参数和距离参数的测量值确定与当前测量值相匹配的调焦镜头所在的镜头位置的预设值；
    S4：调焦模块控制调焦镜头移动至步骤S3确定的镜头位置；
    S0：结束本次调焦。
  9. 根据权利要求9所述的自动调焦方法，其特征在于，进一步包括步骤S5：经过固定时间间隔返回步骤S1重复调焦过程。
  10. 根据权利要求9所述的自动调焦方法，其特征在于，进一步包括步骤S6：监测相关参数是否有变化；若检测到参数变化，则判定为需要重新调焦，返回步骤S1重复调焦过程；若未检测到参数变化，则判定为不需要重新调焦，返回步骤S5或S0。
  11. 根据权利要求9所述的自动调焦方法，其特征在于，在步骤S4后进一步包括步骤S7：获取实时的投影图像，将获取的投影图像与预设的图像信息或输入信号进行比对，判断投影图像是否达到最佳投影效果，若判定为是，则进入步骤S0；若判定为否，则进入步骤S8；步骤S8：重新确定在对应参数下的调焦镜头的最佳镜头位置，存储并替换掉对应参数下的镜头位置信息，重新进入步骤S4。
PCT/CN2018/071434 2017-11-02 2018-01-04 自动调焦系统、方法以及投影设备 WO2019085260A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201711065262.6A CN109752909B (zh) 2017-11-02 2017-11-02 自动调焦系统、方法以及投影设备
CN201711065262.6 2017-11-02

Publications (1)

Publication Number Publication Date
WO2019085260A1 true WO2019085260A1 (zh) 2019-05-09

Family

ID=66332777

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/071434 WO2019085260A1 (zh) 2017-11-02 2018-01-04 自动调焦系统、方法以及投影设备

Country Status (2)

Country Link
CN (1) CN109752909B (zh)
WO (1) WO2019085260A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112764305A (zh) * 2021-01-27 2021-05-07 深圳市火乐科技发展有限公司 自动对焦组件、自动对焦方法和投影仪
CN114779564B (zh) * 2022-03-31 2023-06-30 南通理工学院 一种数字媒体用课自动调节镜头方向的投影设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4982216A (en) * 1988-05-16 1991-01-01 Minolta Camera Kabushiki Kaisha Focusing device of a camera
US20040130685A1 (en) * 2003-01-02 2004-07-08 Lite-On Technology Corporation Automatic focusing method for projector and projector using this method
US20050001999A1 (en) * 2002-09-11 2005-01-06 Masaharu Eguchi Projection type image display apparatus and image display system
US20120261474A1 (en) * 2009-10-30 2012-10-18 Optoelectronics Co., Ltd. Optical-information-reading apparatus
CN104834162A (zh) * 2015-04-17 2015-08-12 神画科技（深圳）有限公司 热失焦自动补偿投影仪
CN105319815A (zh) * 2015-11-23 2016-02-10 西安中科晶像光电科技有限公司 一种避免投影机镜头虚化的智能调焦系统
CN107490927A (zh) * 2016-06-12 2017-12-19 中兴通讯股份有限公司 基于摄像头的投影对焦方法及投影仪

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3185908B2 (ja) * 1994-06-14 2001-07-11 ノーリツ鋼機株式会社 写真焼付装置
JPH1195324A (ja) * 1997-09-19 1999-04-09 Fujitsu General Ltd 簡易画面サイズ調整プロジェクタ
JP2006105811A (ja) * 2004-10-06 2006-04-20 Fuji Electric Device Technology Co Ltd 半導体光センサデバイス及び測距方法
JP4483881B2 (ja) * 2007-03-20 2010-06-16 カシオ計算機株式会社 投影装置、投影制御方法及びプログラム
CN102967991A (zh) * 2012-11-08 2013-03-13 广东欧珀移动通信有限公司 一种调节投影仪焦距的方法、装置、系统及移动终端
CN105319801B (zh) * 2014-07-07 2018-05-29 宁波舜宇光电信息有限公司 一种自动对焦摄像模组调焦定位镜头的方法
KR102633538B1 (ko) * 2016-03-25 2024-02-06 엘지이노텍 주식회사 센서 모듈 및 이의 동작 방법

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4982216A (en) * 1988-05-16 1991-01-01 Minolta Camera Kabushiki Kaisha Focusing device of a camera
US20050001999A1 (en) * 2002-09-11 2005-01-06 Masaharu Eguchi Projection type image display apparatus and image display system
US20040130685A1 (en) * 2003-01-02 2004-07-08 Lite-On Technology Corporation Automatic focusing method for projector and projector using this method
US20120261474A1 (en) * 2009-10-30 2012-10-18 Optoelectronics Co., Ltd. Optical-information-reading apparatus
CN104834162A (zh) * 2015-04-17 2015-08-12 神画科技（深圳）有限公司 热失焦自动补偿投影仪
CN105319815A (zh) * 2015-11-23 2016-02-10 西安中科晶像光电科技有限公司 一种避免投影机镜头虚化的智能调焦系统
CN107490927A (zh) * 2016-06-12 2017-12-19 中兴通讯股份有限公司 基于摄像头的投影对焦方法及投影仪

Also Published As

Publication number Publication date
CN109752909A (zh) 2019-05-14
CN109752909B (zh) 2021-06-08

Similar Documents

Publication Publication Date Title
US8228623B2 (en) Imaging device
US7609458B2 (en) Projection apparatus, elevation angle control method therefor and recording medium
JP4639205B2 (ja) 撮像装置及び制御方法、及びユーザーインタフェースの表示装置
JP4181886B2 (ja) ズームレンズの制御装置および撮影システム
JP2008241491A (ja) ３次元計測装置
US20130188092A1 (en) Image pickup apparatus
WO2021128601A1 (zh) 投影对焦的方法、装置、投影仪和可读存储介质
JP2015031946A (ja) 光学装置及び合焦方法
CN105635564A (zh) 用于同步自动聚焦的多相机装置和方法
WO2019085260A1 (zh) 自动调焦系统、方法以及投影设备
CN109633860A (zh) 自动调节镜头位置的方法、镜头位置调节装置和投影仪
JP5192669B2 (ja) プロジェクタ、位置調整装置および位置調整方法
JPH02184808A (ja) レンズ位置制御装置
JP2001036799A (ja) 固定焦点型撮像装置の光学レンズ位置調整法およびその方法にかかるプログラムを記録したコンピュータ読み取り可能な記録媒体並びに固定焦点型撮像装置の光学レンズ位置調整装置
JP2019184711A (ja) 光学機器
US6356713B1 (en) Blurring correction apparatus and image taking apparatus having the same
CN112799275B (zh) 一种超短焦投影镜头调焦方法、调焦系统及投影仪
WO2017201730A1 (zh) 基于激光雷达测距的图像调焦系统及方法
JP4865275B2 (ja) 焦点検出装置及び撮像装置
JPH11109218A (ja) 自動焦点検出装置
JP3940010B2 (ja) 自動合焦機能を有する画像入力装置
JP7057200B2 (ja) 撮像装置
JP2015194578A (ja) 光学機器、補正方法および制御方法
CN219778080U (zh) 一种自动对焦投影仪
JP2005351959A (ja) 画像投射装置、および、そのフォーカス調整方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18873796

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18873796

Country of ref document: EP

Kind code of ref document: A1