WO2016165143A1 - 热失焦自动补偿投影仪 - Google Patents
热失焦自动补偿投影仪 Download PDFInfo
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- WO2016165143A1 WO2016165143A1 PCT/CN2015/076918 CN2015076918W WO2016165143A1 WO 2016165143 A1 WO2016165143 A1 WO 2016165143A1 CN 2015076918 W CN2015076918 W CN 2015076918W WO 2016165143 A1 WO2016165143 A1 WO 2016165143A1
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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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects
Definitions
- the present invention relates to a projector, and more particularly to a thermal defocusing automatic compensation projector.
- the projector Since the projector is an active illuminating device, it needs to use a light bulb or LED or laser as a light source to work. These light sources are all high-heating bodies. Even if the heat dissipation is done well, the internal temperature of the projector is higher than the ambient temperature, which causes the projection. After using the machine for a while, the projected picture will gradually become blurred. The reason is mainly because the projection lens and related components cause the focal length of the projection lens due to thermal expansion and contraction (commonly known as hot running focus or thermal out of focus). It is necessary to readjust the back focal length of the projection lens to make the projection picture clear again. .
- the main feature of the invention is that a temperature sensor is arranged near the lens for detecting the temperature value of the projection lens, and the focus control module sends a focus command to the focus motor according to the predetermined parameter according to the temperature signal sent by the temperature sensor.
- the focus motor drives at least one set of lenses to adjust the back and forth to make the blurred image clear, thereby realizing the automatic defocusing compensation function.
- the focus motor includes a voice coil motor, a stepping motor, or a servo motor.
- the technical solution adopted by the present invention to solve the technical problem thereof is to provide a thermal defocusing automatic compensation projector, the projector comprising at least one set of projection lenses that can be moved back and forth within a focus range, and driving the projection a focusing motor that moves the projection lens;
- a temperature sensor for monitoring a temperature of the projection lens and outputting a temperature signal to a focus control module of the projector
- the focus control module determines according to the temperature signal and a predetermined rule, and outputs a focus command to the focus motor when an out-of-focus phenomenon occurs;
- the focus motor drives the projection lens to move the focus according to the focus command to obtain the clearest projected image.
- the focus control module records a temperature signal transmitted by the temperature sensor each time the focus is clear;
- the predetermined rule is that the focus control module calculates a predetermined value that the temperature of the projection lens reaches when the projected image is gradually blurred from the clear according to the recorded temperature signal. Further, the focus control module is further pre-set with a focus adjustment parameter when the temperature of the projection lens reaches the predetermined value.
- the focusing parameter is the number of steps, or the running time, or the angular displacement, or the current value of the focusing motor.
- the focus motor includes a voice coil motor, or a stepping motor, or a servo motor.
- the temperature sensor is located on a surface of the projection lens.
- Figure 1 is a schematic block diagram of a thermal out of focus automatic compensation projector
- Figure 2 is a flow chart of the focusing method of the thermal defocusing automatic compensation projector.
- FIG. 1 is a schematic block diagram of a thermal defocusing automatic compensation projector of the present invention.
- the projection lens 1 A groove (not shown) is provided around, and the temperature change at the groove is most sensitive to the back focus adjustment of the lens.
- Temperature sensor 11 is set in the groove for detecting the projection lens 1 temperature. In this embodiment, when the projected image is clear, the temperature sensor 11 is triggered and directed to the focus control module 2 Send the corresponding temperature signal.
- the temperature change of different projection lenses may be different for the position most sensitive to the back focus adjustment of the lens. In this case, the temperature sensor may be placed at the position most sensitive to the temperature change.
- the focus control module 2 records the temperature signal from the temperature sensor 11 and calculates the projection lens based on the temperature signal after a period of time. 1 The temperature change reaches a predetermined value. At this time, the projected image begins to gradually become blurred, and the focus control module 2 needs to output a focus command to the focus motor 3.
- Focus control module 2 A focusing parameter different from a predetermined value at which the temperature change is reached is also prestored. Understandably, during use of the projector, as the use time is lengthened, the projection lens 1 The temperature varies with the time of use. With the automatic compensation focusing system of the present invention, the projection temperature sensor 11 emits a temperature signal each time the projected image is clear, and the focus control module 2 records the projection temperature sensor. 11 The temperature signal is sent each time, and the reference temperature at the time of focusing is automatically compensated as the next trigger. Focus control module 2 Different predetermined values reached by the temperature change are calculated according to different temperature signals, and different predetermined values correspond to different focusing parameters.
- the focus control module 2 is based on the projection lens 1
- the temperature value at which the projected image is clear is measured to a predetermined value at which the temperature change reaches, and when the temperature reaches a predetermined value, the pre-stored focusing parameter corresponding to the predetermined value is output to the focus motor 3 in the form of a focus command.
- the projection lens 1 When the temperature change reaches a predetermined value, the projected image begins to gradually become blurred.
- all the predetermined values and the corresponding focusing parameters are obtained through a large amount of experimental data, and can be modified according to factors such as the life of the projector itself.
- Focusing motor 3 After receiving the focus command, drive the projection lens according to the received focus adjustment parameters.
- the back focus moves back and forth within the adjustable focus range to make the projected image focus sharply.
- the predetermined focusing parameter is within the adjustable focus range of the projection lens 1.
- the focusing parameter is the focus motor 3 The number of steps, or the running time, or the angular displacement, or the drive current value of the focus motor 3.
- the temperature sensor 11 emits a temperature signal again and the focus control module 2 Record the temperature signal and use it as the reference reference temperature for the next trigger to automatically compensate for the focus.
- the thermal defocusing automatic compensation focusing system of the projector of the present invention has a temperature sensor that is most sensitive to the back focus adjustment of the lens by setting a temperature sensor on the projection lens attachment.
- a focusing motor is arranged on the focusing component of the lens, the focusing motor can drive at least one group of lenses to move back and forth to perform focusing operation, and the focusing control module is used for focusing motor to perform back focus adjustment.
- the focus module records the temperature signal from the temperature sensor every time the focus is clear. After a period of time (a few minutes or tens of minutes), the focus module measures the lens temperature change from the temperature signal sent from the temperature sensor.
- the focus adjustment command is issued to the focus motor, so that the focus motor adjusts the lens back focus according to a predetermined parameter (the predetermined parameter can be obtained by a large amount of test data), so that the projected image is focused.
- a predetermined parameter can be obtained by a large amount of test data
- the focusing module detects the temperature change from the signal sent from the temperature sensor again to a predetermined value, the focus command will be issued again to adjust the focus, so that the projected image can be changed regardless of the temperature change.
- This method can solve the problem of thermal defocusing of the projection lens well, especially when there is a plastic aspherical lens in the projection lens. In the automatic focusing system, the method is the best solution to solve the problem of thermal defocusing. .
- FIG. 2 is a flow chart of a focusing method of a thermal defocusing automatic compensation projector. As can be seen from Fig. 2, in the present embodiment, when the image is started by S200, the projected image is sharply focused.
- Step S201 detecting a current temperature value of the projection lens, and outputting a temperature signal.
- Step S202 when the temperature signal reaches a predetermined value according to the temperature signal and the predefined rule, issue a focus command; specifically, the predefined rule includes a predetermined value that the temperature signal can reach after a fixed time, and The focus parameter corresponding to the predetermined value. It can be understood that the predetermined values are correspondingly different according to the temperature signals. When the temperature signal reaches a predetermined value, it indicates that the projected image begins to gradually become blurred, a focus command needs to be issued, and the focus command includes a focus parameter.
- Step S203 according to the focusing command, focusing the focus of the projection lens in the adjustable focus range to make the projected image clear; in the present invention, the focusing lens is used to drive the projection lens for focusing, and the focusing parameter may be adjusted.
- the focus motor can be a voice coil motor, or a stepper motor, or a servo motor.
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Abstract
一种热失焦自动补偿投影仪，包括至少一组可以在调焦范围内前后移动调焦的投影镜头（1），驱动投影镜头（1）移动的调焦马达（3），检测投影镜头（1）的温度并输出温度信号的温度传感器（11），根据温度信号及预订规则判断投影仪是否出现失焦现象、并在发生失焦现象时向调焦马达（3）输出调焦命令的调焦控制模块（2）。调焦马达（3）根据调焦命令驱动投影镜头（1）移动调焦获得最清晰的投影图像。这种热失焦自动补偿调焦系统可以有效地避免投影镜头受温度的影响而使投影图像模糊，出现热失焦的现象。
Description
本发明涉及投影仪，更具体地说，涉及一种热失焦自动补偿投影仪。
由于投影机属于主动发光设备，需要采用灯泡或者LED或者激光作为光源才能工作，而这些光源都是高发热体，即使散热做得再好，投影机内部温度也是高于环境温度，这就造成投影机使用一段时间后，投影画面会逐渐变得模糊不清。究其原因，主要是因为投影镜头及相关构件因热胀冷缩而造成投影镜头的焦距跑位（俗称热跑焦或热失焦），需要重新调整投影镜头的后焦距才能使投影画面重新清晰。这样在实际使用过程中不太方便，特别是将投影机吊顶装置时，需要站在梯子上或桌子上才能重新调焦。所以一些高端投影机为了减低温度变化的影响，采用全金属高精度结构件与全玻璃镜片做成投影镜头及关联结构件，有时还需采用玻璃非球面镜片，但这样会增加很多成本。
鉴于上述缺点，如果能找出镜头温度变化与镜头后焦变化的关系，就能通过机械传动来对镜头进行后焦调整，从而解决热失焦问题。本发明主要特征是，在镜头附近设置一个温度传感器，用来检测投影镜头的温度值，调焦控制模块根据温度传感器发过来的温度信号，按照预定的参数向调焦马达发出调焦命令，调焦马达驱动至少一组镜片前后运动进行调焦，使模糊的图像变得清晰，从而实现热失焦自动补偿功能。所述调焦马达包括音圈马达、步进马达或伺服马达。
本发明解决其技术问题所采用的技术方案是：提供一种热失焦自动补偿投影仪，所述投影仪包括至少一组可以在调焦范围内前后移动调焦的投影镜头，及驱动所述投影镜头移动的调焦马达；其特征在于，
还包括用于监测所述投影镜头的温度并向所述投影仪的调焦控制模块输出温度信号的温度传感器；
所述调焦控制模块根据所述温度信号及预定规则进行判断，并在发生失焦现象时向所述调焦马达输出调焦命令；
所述调焦马达根据所述调焦命令驱动所述投影镜头移动调焦 获得最清晰的投影图像 。
进一步地，所述调焦控制模块在每次调焦清晰时，记录所述温度传感器传来的温度信号；
所述预定规则为所述调焦控制模块根据记录的所述温度信号测算出投影图像从清晰逐渐变模糊时所述投影镜头的温度达到的预定值。进一步地，所述调焦控制模块还预设有所述投影镜头的温度达到所述预定值时对应的调焦参数。
进一步地，所述调焦参数为所述调焦马达的步数、或运行时间、或角位移、或电流值。
进一步地，所述调焦马达包括音圈马达、或步进马达、或伺服马达 。
进一步地，所述温度传感器位于所述投影镜头的表面。
下面将结合附图及实施例对本发明作进一步说明，附图中：
图1是 热失焦自动补偿投影仪的原理框图；
图 2 是热失焦自动补偿投影仪的调焦方法流程图。
如图 1 所示，为本发明的热失焦自动补偿投影仪的原理框图。 在本实施例中，投影镜头 1
周围设置有凹槽（图中未示出），且该凹槽处的温度变化对镜头的后焦调整最敏感。温度传感器 11 设置在凹槽中，用于检测投影镜头 1
的温度。本实施例中，投影图像清晰时，温度传感器 11 被触发并向调焦控制模块 2
发出相应的温度信号。可以理解地，在不同的实施例中，不同的投影镜头的温度变化对镜头的后焦调整最敏感的位置可能不同，此时，对应将温度传感器置于温度变化影响最敏感的位置即可。
调焦控制模块 2 记录温度传感器 11 发出的温度信号，并在一段时间后根据温度信号测算出投影镜头 1
的温度变化达到了预定值，此时，投影图像开始逐渐变得模糊，调焦控制模块 2 需向调焦马达 3 输出调焦命令。
调焦控制模块 2
中还预存有与温度变化达到的预定值不同的调焦参数。可以理解地，投影仪在使用过程中，随着使用时间的加长，投影镜头 1
的温度随着使用时间的不同而不同。通过本发明的自动补偿调焦系统，投影温度传感器 11 每次在投影图像清晰时发出温度信号，调焦控制模块 2 记录下投影温度传感器
11 每次发出的温度信号，并作为下次触发自动补偿调焦时的基准温度。调焦控制模块 2
根据不同的温度信号测算出温度变化所达到的不同预定值，不同预定值对应有不同的调焦参数。
也就是说，调焦控制模块 2 根据投影镜头 1
在投影图像清晰时的温度值测算出温度变化达到的预定值，并在温度达到预定值时，将与该预定值对应的预存的调焦参数以调焦命令的形式输出给调焦马达 3 。
在本发明中，投影镜头 1
的温度变化达到预定值时，投影图像开始逐渐变得模糊。本实施例中，所有的预定值、及对应的调焦参数都是通过大量的实验数据获得，可以根据投影仪自身的使用寿命等因素做相应的修改。
调焦马达 3 收到调焦命令后，按照接收到预定的调焦参数，驱动投影镜头 1
的后焦在可调焦范围内前后移动，使投影图像聚焦清晰。需要说明是，预定的调焦参数在投影镜头 1 的可调焦范围内。调焦参数为调焦马达 3
的步数、或运行时间、或角位移、或调焦马达 3 的驱动电流值。
当调焦马达 3 调焦之后使投影图像聚焦清晰时，温度传感器 11 再次发出温度信号且调焦控制模块 2
记录下该温度信号，并作为下次触发自动补偿调焦时的基准参考温度。
从上述实施例可以看出，本发明的投影仪的热失焦自动补偿调焦系统，通过在投影镜头附件设置一个温度传感器，这个位置的温度变化对镜头的后焦调整最敏感为最佳设置位置，在镜头的调焦组件上设置一个调焦马达，调焦马达可以驱动至少一组镜片前后移到而进行调焦操作，调焦控制模块用于调焦马达进行后焦调整。在每次调焦清晰时，调焦模块记录温度传感器传来的温度信号，一段时间后（几分钟或几十分钟），当调焦模块从温度传感器传来的温度信号中测算出镜头温度变化达到预定值时（此时投影图像已逐渐模糊），向调焦马达下达调焦命令，使调焦马达按预定参数调整镜头后焦（该预定参数可通过大量试验数据获得），使投影图像聚焦清晰；如果再过一段时间后，调焦模块再次从温度传感器传出的信号中测算出温度变化达到预定值时，会再次发出调焦命令进行调焦，这样不管温度怎样变化，可使投影图像始终清晰。这种方法可以很好的解决投影镜头的热失焦问题，特别是投影镜头中有塑胶非球面镜片时效果最明显；在自动调焦系统中，该方法是解决热失焦问题的最佳方案。
图2是热失焦自动补偿投影仪的调焦方法流程图。由图2可知，在本实施例中，由S200开始时，投影图像聚焦清晰。
步骤S201，检测投影镜头当前的温度值，并输出温度信号。
步骤S202，根据温度信号和预定义的规则，测算所述温度信号达到预定值时，发出调焦命令；具体来说，预定义规则包括所述温度信号经过固定时间能达到的预定值，以及与预定值对应的调焦参数。可以理解地，根据所述温度信号不同，所述预定值对应不同。当温度信号达到预定值时，说明投影图像开始逐渐变得模糊，需要发出调焦命令，且调焦命令中包含调焦参数。
步骤S203，根据调焦命令，对投影镜头的后焦在可调焦范围内进行调焦，使投影图像清晰；本发明中，采用调焦马达驱动投影镜头进行调焦，调焦参数可以是调焦马达的步数、或运行时间、或角位移、或调焦马达的驱动电流值。调焦马达可以是音圈马达、或步进马达、或伺服马达。
Claims (6)
- 一种热失焦自动补偿投影仪，所述投影仪包括至少一组可以在调焦范围内前后移动调焦的投影镜头，及驱动所述投影镜头移动的调焦马达；其特征在于，还包括用于监测所述投影镜头的温度并向所述投影仪的调焦控制模块输出温度信号的温度传感器；所述调焦控制模块根据所述温度信号及预定规则进行判断，并在发生失焦现象时向所述调焦马达输出调焦命令；所述调焦马达根据所述调焦命令驱动所述投影镜头移动调焦 获得最清晰的投影图像 。
- 根据权利要求1所述的热失焦自动补偿投影仪，其特征在于，所述调焦控制模块在每次调焦清晰时，记录所述温度传感器传来的温度信号；所述预定规则为所述调焦控制模块根据记录的所述温度信号测算出投影图像从清晰逐渐变模糊时所述投影镜头的温度达到的预定值。
- 根据权利要求1或2任一所述的热失焦自动补偿投影仪，其特征在于，所述调焦控制模块还预设有所述投影镜头的温度达到所述预定值时对应的调焦参数。
- 根据权利要求3所述的热失焦自动补偿投影仪，其特征在于，所述调焦参数为所述调焦马达的步数、或运行时间、或角位移、或电流值。
- 根据权利要求 1 所述的 热失焦自动补偿投影仪，其特征在于，所述调焦马达包括音圈马达、或步进马达、或伺服马达 。
- 根据权利要求 1 所述的 热失焦自动补偿投影仪 ，其特征在于，所述温度传感器位于所述投影镜头的表面。
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107368122A (zh) * | 2017-08-08 | 2017-11-21 | 南京华讯方舟通信设备有限公司 | 激光投影仪和用于其中的温度自动控制系统及控制方法 |
| CN110784698A (zh) * | 2019-10-31 | 2020-02-11 | 峰米(北京)科技有限公司 | 一种热失焦补偿方法、存储介质和投影设备 |
| US10642143B2 (en) | 2017-07-31 | 2020-05-05 | Coretronic Corporation | Projector and projection correction method thereof |
| CN112764298A (zh) * | 2021-01-31 | 2021-05-07 | 迪擎光电(台州)有限责任公司 | 一种投影镜头系统 |
| CN113376784A (zh) * | 2021-04-20 | 2021-09-10 | 武汉智谱科技有限公司 | 一种连续变焦镜头全温度段清晰点的机电主动补偿方法 |
| CN113391503A (zh) * | 2020-03-11 | 2021-09-14 | 苏州佳世达光电有限公司 | 投影机及投影方法 |
| CN115061334A (zh) * | 2022-05-19 | 2022-09-16 | 深圳市橙子数字科技有限公司 | 热虚焦解决方法、镜头、系统、计算机设备及介质 |
| CN117319618A (zh) * | 2023-11-28 | 2023-12-29 | 维亮(深圳)科技有限公司 | 一种用于清晰度评价的投影仪热跑焦判断方法及系统 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10642143B2 (en) | 2017-07-31 | 2020-05-05 | Coretronic Corporation | Projector and projection correction method thereof |
| CN107368122A (zh) * | 2017-08-08 | 2017-11-21 | 南京华讯方舟通信设备有限公司 | 激光投影仪和用于其中的温度自动控制系统及控制方法 |
| CN113596421A (zh) * | 2019-10-31 | 2021-11-02 | 峰米(北京)科技有限公司 | 一种热失焦补偿方法、存储介质和投影设备 |
| CN110784698A (zh) * | 2019-10-31 | 2020-02-11 | 峰米(北京)科技有限公司 | 一种热失焦补偿方法、存储介质和投影设备 |
| CN113596421B (zh) * | 2019-10-31 | 2024-05-14 | 峰米(北京)科技有限公司 | 一种热失焦补偿方法、存储介质和投影设备 |
| CN113391503A (zh) * | 2020-03-11 | 2021-09-14 | 苏州佳世达光电有限公司 | 投影机及投影方法 |
| CN112764298A (zh) * | 2021-01-31 | 2021-05-07 | 迪擎光电(台州)有限责任公司 | 一种投影镜头系统 |
| CN112764298B (zh) * | 2021-01-31 | 2022-10-11 | 迪擎光电(台州)有限责任公司 | 一种投影镜头系统 |
| CN113376784B (zh) * | 2021-04-20 | 2022-06-10 | 武汉智谱科技有限公司 | 一种连续变焦镜头全温度段清晰点的机电主动补偿方法 |
| CN113376784A (zh) * | 2021-04-20 | 2021-09-10 | 武汉智谱科技有限公司 | 一种连续变焦镜头全温度段清晰点的机电主动补偿方法 |
| CN115061334A (zh) * | 2022-05-19 | 2022-09-16 | 深圳市橙子数字科技有限公司 | 热虚焦解决方法、镜头、系统、计算机设备及介质 |
| CN117319618A (zh) * | 2023-11-28 | 2023-12-29 | 维亮(深圳)科技有限公司 | 一种用于清晰度评价的投影仪热跑焦判断方法及系统 |
| CN117319618B (zh) * | 2023-11-28 | 2024-03-19 | 维亮(深圳)科技有限公司 | 一种用于清晰度评价的投影仪热跑焦判断方法及系统 |
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