CN102193286A - Projection system and projection method thereof - Google Patents

Projection system and projection method thereof Download PDF

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CN102193286A
CN102193286A CN 201010133068 CN201010133068A CN102193286A CN 102193286 A CN102193286 A CN 102193286A CN 201010133068 CN201010133068 CN 201010133068 CN 201010133068 A CN201010133068 A CN 201010133068A CN 102193286 A CN102193286 A CN 102193286A
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unit
light source
scanning
driving circuit
projection
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CN102193286B (en
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游镇安
柯丽如
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Foxlink Electronics Dongguan Co Ltd
Cheng Uei Precision Industry Co Ltd
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Foxlink Electronics Dongguan Co Ltd
Cheng Uei Precision Industry Co Ltd
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Abstract

The invention discloses a projection system and a projection method thereof. The projection system comprises a light source unit, a light source driving circuit, a scanning unit driving circuit, a detection unit and a controller. The light source driving circuit has a power modulation unit, and the scanning unit has a scanning lens. The projection method of the projection system comprises the following steps: (1) starting a projection system, driving a light source unit to generate low-power laser by a light source driving circuit, and driving a scanning unit by a scanning unit driving circuit; (2) the detection unit detects the running state of the scanning lens and generates a feedback signal; (3) the controller receives the feedback signal to judge the running state of the scanning lens and sends the signal to the light source driving circuit and the power modulation unit; (4) the power modulation unit receives the signal and controls the light source unit. The projection method of the projection system controls the output power of the laser through the power modulation unit, and prevents the laser output by the projection system from damaging human eyes.

Description

投影系统及其投影方法Projection system and projection method thereof

技术领域technical field

本发明涉及一种投影技术,尤其涉及一种投影系统及其投影方法。The invention relates to a projection technology, in particular to a projection system and a projection method thereof.

背景技术Background technique

投影系统已大量应用于手机、个人数字助理、可携式放映机等电子产品中。一种现有的投影系统包括一控制器、一光源驱动电路、一扫描单元驱动电路、一光源单元、一扫描单元及一检测单元。所述扫描单元具有一可摆动的扫描镜片,检测单元用于侦测扫描单元的扫描镜片的运行状态并生成相应的反馈讯号,输出的反馈讯号由控制器接受,控制器控制光源驱动电路及扫描单元驱动电路。现有投影系统的投影方法是在投影系统处于开启状态时,扫描单元驱动电路驱动扫描镜片往复摆动,用于控制输出相对应影像讯号的光源驱动电路同时会驱动光源单元生成并输出具高功率的激光,激光通过扫描镜片的摆动以扫描方式射出,检测单元侦测扫描镜片的运行状态并生成相应的反馈讯号,控制器接受并判断该反馈讯号,进而控制光源驱动电路及扫描单元驱动电路作下一步相关的操作。该投影系统的投影方法可有效监控投影系统在投影过程中由于扫描单元运行错误而造成的危害。Projection systems have been widely used in electronic products such as mobile phones, personal digital assistants, and portable projectors. An existing projection system includes a controller, a light source driving circuit, a scanning unit driving circuit, a light source unit, a scanning unit and a detection unit. The scanning unit has a swingable scanning mirror, and the detection unit is used to detect the operating state of the scanning mirror of the scanning unit and generate a corresponding feedback signal, the output feedback signal is accepted by the controller, and the controller controls the light source driving circuit and the scanning unit drive circuit. The projection method of the existing projection system is that when the projection system is turned on, the scanning unit driving circuit drives the scanning mirror to swing back and forth, and the light source driving circuit used to control the output of the corresponding image signal will drive the light source unit to generate and output high-power Laser, the laser is emitted in a scanning manner through the swing of the scanning mirror, the detection unit detects the operating state of the scanning mirror and generates a corresponding feedback signal, the controller accepts and judges the feedback signal, and then controls the light source driving circuit and the scanning unit driving circuit to perform One-step related operations. The projection method of the projection system can effectively monitor the damage caused by the operation error of the scanning unit during the projection process of the projection system.

然而,上述投影系统在刚启动时,由于光源单元生成的激光功率较高,此时若扫描镜片无法正常摆动,激光不能通过扫描镜片的摆动以扫描方式射出,激光将汇聚成束状,若该激光直射入人眼,容易对人眼造成严重伤害。However, when the above-mentioned projection system is just started, because the laser power generated by the light source unit is relatively high, if the scanning mirror cannot swing normally, the laser cannot be emitted in a scanning manner through the swing of the scanning mirror, and the laser will converge into a beam. The laser light directly enters the human eyes, which may cause serious damage to the human eyes.

发明内容Contents of the invention

本发明的目的在于提供一种可避免伤害人眼的投影系统及其投影方法。The object of the present invention is to provide a projection system and projection method that can avoid damage to human eyes.

为实现上述目的,本发明所提供投影系统包括一光源单元、一光源驱动电路、一扫描单元、一扫描单元驱动电路、一检测单元及一控制器,光源驱动电路用以驱动光源单元生成激光,光源驱动电路具有一功率调变单元,用以调控光源单元生成的激光功率,扫描单元具有一可摆动的扫描镜片,用以反射光源单元生成的激光,扫描单元驱动电路用以驱动扫描镜片的摆动,检测单元用以侦测扫描单元的扫描镜片的运行状态并生成相应的反馈讯号,控制器控制光源驱动电路及扫描单元驱动电路并接受上述反馈讯号进行判断,以输出扫描单元的运行状态讯号给功率调变单元。To achieve the above object, the projection system provided by the present invention includes a light source unit, a light source driving circuit, a scanning unit, a scanning unit driving circuit, a detection unit and a controller, the light source driving circuit is used to drive the light source unit to generate laser light, The light source driving circuit has a power modulating unit for regulating the laser power generated by the light source unit, the scanning unit has a swingable scanning mirror for reflecting the laser light generated by the light source unit, and the scanning unit driving circuit is used for driving the scanning mirror to swing The detection unit is used to detect the operating state of the scanning lens of the scanning unit and generate a corresponding feedback signal. The controller controls the light source driving circuit and the scanning unit driving circuit and receives the above feedback signal for judgment, so as to output the operating state signal of the scanning unit to power modulation unit.

本发明投影系统的投影方法包括如下步骤:The projection method of the projection system of the present invention comprises the following steps:

(1)启动投影系统,控制器分别向光源驱动电路及扫描单元驱动电路发出驱动讯号,光源驱动电路驱动光源单元生成低功率的激光,扫描单元驱动电路驱动扫描单元;(1) Start the projection system, the controller sends driving signals to the light source driving circuit and the scanning unit driving circuit respectively, the light source driving circuit drives the light source unit to generate low-power laser light, and the scanning unit driving circuit drives the scanning unit;

(2)检测单元侦测扫描单元的扫描镜片的运行状态并生成相应的反馈讯号传送给控制器;(2) The detection unit detects the operating state of the scanning mirror of the scanning unit and generates a corresponding feedback signal to the controller;

(3)控制器接受上述反馈讯号进行判断扫描镜片运行状态是否正常,并发送讯号给光源驱动电路及其功率调变单元;(3) The controller receives the above feedback signal to judge whether the scanning lens is in normal operation state, and sends a signal to the light source drive circuit and its power modulation unit;

(4)功率调变单元接受讯号并对光源单元进行控制。(4) The power modulation unit receives the signal and controls the light source unit.

如上所述,本发明投影系统的投影方法通过功率调变单元调节激光输出功率的高低,进而可使投影系统在刚启动时仅输出低功率的激光,功率调变单元在确定扫描单元运行状态后再对光源单元进行控制,可防止在扫描单元未正常运行时过高功率的激光直射入人眼而造成对人眼的伤害。As mentioned above, the projection method of the projection system of the present invention adjusts the level of laser output power through the power modulation unit, so that the projection system can only output low-power laser light when it is just started. After the power modulation unit determines the operating state of the scanning unit Then, the light source unit is controlled to prevent the excessively high-power laser from directly entering human eyes and causing damage to human eyes when the scanning unit is not operating normally.

附图说明Description of drawings

图1为本发明投影系统的原理框图;Fig. 1 is the functional block diagram of projection system of the present invention;

图2为本发明投影系统的扫描镜片工作示意图;Fig. 2 is the working diagram of the scanning lens of the projection system of the present invention;

图3为本发明投影系统工作时由扫描单元送出的激光照射于投影透镜上的示意图;Fig. 3 is a schematic diagram of the laser beam sent by the scanning unit irradiating the projection lens when the projection system of the present invention is in operation;

图4为本发明投影系统的投影方法的流程图;4 is a flowchart of a projection method of the projection system of the present invention;

图5为图4所示步骤(4)的流程图。Fig. 5 is a flowchart of step (4) shown in Fig. 4 .

图中各附图标记说明如下:The reference signs in the figure are explained as follows:

投影系统      100Projection system 100

控制器         10     光源驱动电路    20Controller 10 Light source drive circuit 20

功率调变单元   201    扫描单元驱动电路30Power modulation unit 201 Scanning unit drive circuit 30

光源单元       40     扫描单元        50Light source unit 40 Scanning unit 50

扫描镜片       501    检测单元        60Scanning lens 501 Detection unit 60

传感器         601    投影透镜        70Sensor 601 Projection Lens 70

投影成像区域   701    照射区域        80Projection imaging area 701 Irradiation area 80

具体实施方式Detailed ways

为详细说明本发明的技术内容、构造特征、所实现目的及效果,以下结合实施方式并配合附图详予说明。In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

请参阅图1,本发明投影系统100包括一控制器10、一光源驱动电路20、一扫描单元驱动电路30、一光源单元40、一扫描单元50、一检测单元60及一投影透镜70。Please refer to FIG. 1 , the projection system 100 of the present invention includes a controller 10 , a light source driving circuit 20 , a scanning unit driving circuit 30 , a light source unit 40 , a scanning unit 50 , a detection unit 60 and a projection lens 70 .

请参阅图1,本发明投影系统100的控制器10用以控制光源驱动电路20及扫描单元驱动电路30。所述光源驱动电路20用以驱动光源单元40生成激光,光源驱动电路20具有一功率调变单元201,用以调控光源单元40生成的激光功率,扫描单元驱动电路30用以驱动扫描单元50,检测单元60用以侦测扫描单元50的运行状态并生成相应的反馈讯号,输出的反馈讯号由控制器10接受。Please refer to FIG. 1 , the controller 10 of the projection system 100 of the present invention is used to control the light source driving circuit 20 and the scanning unit driving circuit 30 . The light source driving circuit 20 is used to drive the light source unit 40 to generate laser light. The light source driving circuit 20 has a power modulation unit 201 for regulating the laser power generated by the light source unit 40. The scanning unit driving circuit 30 is used to drive the scanning unit 50. The detection unit 60 is used to detect the running state of the scanning unit 50 and generate a corresponding feedback signal, and the output feedback signal is accepted by the controller 10 .

请参阅图2,所述扫描单元50具有一个采用微机电系统(MicroElectro Mechanical System,MEMS)技术做成的二维扫描镜片501,所述扫描镜片501可在扫描单元驱动电路30的驱动下同时绕垂直于纸面的轴和平行于纸面的轴摆动,由此光源单元40输出的激光经扫描镜片501的反射可在两个维度上进行图像扫描,故可将完整的影像投射出来。此外,扫描单元50的扫描镜片501在垂直于纸面的轴和平行于纸面的轴上来回往复摆动时,各具有两极限位置,故经扫描单元50扫描后送出的激光到达投影透镜70时形成有一照射区域80。Referring to Fig. 2, the scanning unit 50 has a two-dimensional scanning mirror 501 made of micro-electromechanical system (MicroElectro Mechanical System, MEMS) technology, and the scanning mirror 501 can be driven by the scanning unit drive circuit 30 to simultaneously rotate The axis perpendicular to the paper and the axis parallel to the paper swing, so that the laser light output by the light source unit 40 can scan the image in two dimensions after being reflected by the scanning mirror 501, so that a complete image can be projected. In addition, when the scanning mirror 501 of the scanning unit 50 swings back and forth on the axis perpendicular to the paper surface and the axis parallel to the paper surface, each has two extreme positions, so when the laser light sent by the scanning unit 50 reaches the projection lens 70 An irradiation area 80 is formed.

请参阅图2和图3,所述投影透镜70大致呈片状且具有一大致呈长方形的投影成像区域701,所述检测单元60包括传感器601,传感器601设于投影透镜70上并位于投影成像区域701外。所述照射区域80的长、宽均略大于投影透镜70的投影成像区域701。扫描镜片601摆动时,传感器601接受照射区域80的激光并生成相应的反馈讯号,输出的反馈讯号由控制器10接受,控制器10判断并输出扫描镜片501运行状态的讯号给光源驱动电路20的功率调变单元201,由此可使本发明投影系统100作下一步相关的操作。2 and 3, the projection lens 70 is roughly sheet-shaped and has a roughly rectangular projection imaging area 701, the detection unit 60 includes a sensor 601, the sensor 601 is arranged on the projection lens 70 and is located in the projection imaging region 701. Outside area 701. The length and width of the irradiation area 80 are slightly larger than the projection imaging area 701 of the projection lens 70 . When the scanning mirror 601 swings, the sensor 601 receives the laser light in the irradiated area 80 and generates a corresponding feedback signal. The output feedback signal is accepted by the controller 10, and the controller 10 judges and outputs a signal of the operating state of the scanning mirror 501 to the light source driving circuit 20. The power modulation unit 201 can thus enable the projection system 100 of the present invention to perform related operations in the next step.

请参阅图1、图2、图3和图4,本发明投影系统100的投影方法包括如下步骤:Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the projection method of the projection system 100 of the present invention includes the following steps:

(1)启动投影系统100,控制器10分别向光源驱动电路20及扫描单元驱动电路30发出驱动讯号,光源驱动电路20驱动光源单元40生成低功率的激光,扫描单元驱动电路30驱动扫描单元50;(1) Start the projection system 100, the controller 10 sends driving signals to the light source driving circuit 20 and the scanning unit driving circuit 30 respectively, the light source driving circuit 20 drives the light source unit 40 to generate low-power laser light, and the scanning unit driving circuit 30 drives the scanning unit 50 ;

(2)检测单元60侦测扫描单元50的扫描镜片501的运行状态并生成相应的反馈讯号传送给控制器10;(2) The detection unit 60 detects the operating state of the scanning mirror 501 of the scanning unit 50 and generates a corresponding feedback signal to the controller 10;

(3)控制器10接受上述反馈讯号进行判断扫描镜片501运行状态是否正常,并发送讯号给光源驱动电路20及其功率调变单元201;(3) The controller 10 receives the above-mentioned feedback signal to judge whether the scanning mirror 501 is running normally, and sends a signal to the light source driving circuit 20 and its power modulation unit 201;

(4)功率调变单元201接受讯号并对光源单元40进行控制。(4) The power modulation unit 201 receives the signal and controls the light source unit 40 .

请参阅图4和图5,本发明投影系统100的投影方法,具体包括两种情况,以下给出相应的实施例。Please refer to FIG. 4 and FIG. 5 , the projection method of the projection system 100 of the present invention specifically includes two cases, and the corresponding embodiments are given below.

实施例一,其步骤如下:Embodiment one, its steps are as follows:

(1)启动投影系统100,控制器10分别向光源驱动电路20及扫描单元驱动电路30发出驱动讯号,光源驱动电路20驱动光源单元40生成低功率的激光,扫描单元驱动电路30驱动扫描单元50;此时扫描单元50的扫描镜片501来回往复正常摆动,激光配合扫描镜片501的同步动作以扫描方式送出;(1) Start the projection system 100, the controller 10 sends driving signals to the light source driving circuit 20 and the scanning unit driving circuit 30 respectively, the light source driving circuit 20 drives the light source unit 40 to generate low-power laser light, and the scanning unit driving circuit 30 drives the scanning unit 50 ; At this time, the scanning mirror 501 of the scanning unit 50 swings back and forth normally, and the laser beam is sent out in a scanning manner in cooperation with the synchronous action of the scanning mirror 501;

(2)传感器601接受照射区域80的激光并生成相应的反馈讯号传送给控制器10;(2) The sensor 601 receives the laser light in the irradiated area 80 and generates a corresponding feedback signal to the controller 10;

(3)控制器10接受上述反馈讯号并判断扫描镜片501运行状态正常,发送讯号给光源驱动电路20及其功率调变单元201;(3) The controller 10 receives the above-mentioned feedback signal and judges that the scanning mirror 501 is running normally, and sends a signal to the light source driving circuit 20 and its power modulation unit 201;

(4)功率调变单元201接受讯号并控制光源单元40发出正常功率的激光。(4) The power modulation unit 201 receives the signal and controls the light source unit 40 to emit laser light with normal power.

实施例二,其步骤如下:Embodiment two, its steps are as follows:

(1)启动投影系统100,控制器10分别向光源驱动电路20及扫描单元驱动电路30发出驱动讯号,光源驱动电路20驱动光源单元40生成低功率的激光,扫描单元驱动电路30驱动扫描单元50;此时扫描镜片501不正常摆动,激光无法与扫描镜片501同步动作,激光将于投影透镜70射出且汇聚成束状,由于光源单元40生成的激光为低功率的,激光直射入人眼而无法对人眼造成伤害;(1) Start the projection system 100, the controller 10 sends driving signals to the light source driving circuit 20 and the scanning unit driving circuit 30 respectively, the light source driving circuit 20 drives the light source unit 40 to generate low-power laser light, and the scanning unit driving circuit 30 drives the scanning unit 50 At this time, the scanning mirror 501 is not swinging normally, and the laser cannot move synchronously with the scanning mirror 501. The laser beam will be emitted from the projection lens 70 and converged into a beam. Since the laser light generated by the light source unit 40 is of low power, the laser beam directly enters the human eye and Cannot cause damage to human eyes;

(2)传感器601接受不到正常的激光并生成相应的反馈讯号传送给控制器10;(2) The sensor 601 cannot receive normal laser light and generates a corresponding feedback signal to the controller 10;

(3)控制器10接受上述反馈讯号并判断扫描镜片501运行状态不正常,发送讯号给光源驱动电路20及其功率调变单元201;(3) The controller 10 receives the above-mentioned feedback signal and judges that the scanning mirror 501 is in an abnormal operating state, and sends a signal to the light source driving circuit 20 and its power modulation unit 201;

(4)功率调变单元201接受讯号并对光源单元40进行控制,继续降低激光功率或者关闭光源单元40。(4) The power modulation unit 201 receives the signal and controls the light source unit 40 to continue reducing the laser power or turn off the light source unit 40 .

如上所述,本发明投影系统100的投影方法通过功率调变单元201调节激光输出功率的高低,进而可使投影系统100在刚启动时仅输出低功率的激光,功率调变单元201在确定扫描单元40运行状态后再对光源单元进行控制,可防止在扫描单元40未正常运行时过高功率的激光直射入人眼而造成对人眼的伤害。As mentioned above, the projection method of the projection system 100 of the present invention adjusts the level of laser output power through the power modulation unit 201, so that the projection system 100 can only output low-power laser light when it is just started. The light source unit is controlled after the unit 40 is running, which can prevent the excessively high-power laser from directly entering human eyes and causing damage to human eyes when the scanning unit 40 is not operating normally.

Claims (7)

1.一种投影系统,包括一光源单元、一光源驱动电路、一扫描单元、一扫描单元驱动电路、一检测单元及一控制器,光源单元用以生成激光,光源驱动电路用以驱动光源单元,扫描单元具有一可摆动的扫描镜片,用以反射光源单元生成的激光,扫描单元驱动电路用以驱动扫描镜片的摆动,检测单元用以侦测扫描单元的扫描镜片的运行状态并生成相应的反馈讯号,控制器控制光源驱动电路及扫描单元驱动电路,其特征在于:光源驱动电路具有一功率调变单元,用以调控光源单元生成激光功率,控制器接受上述反馈讯号进行判断,以输出扫描单元的运行状态讯号给光源驱动电路的功率调变单元。1. A projection system, comprising a light source unit, a light source driving circuit, a scanning unit, a scanning unit driving circuit, a detection unit and a controller, the light source unit is used to generate laser light, and the light source driving circuit is used to drive the light source unit The scanning unit has a swingable scanning mirror for reflecting the laser light generated by the light source unit, the scanning unit drive circuit is used to drive the scanning mirror to swing, and the detection unit is used to detect the operating state of the scanning mirror of the scanning unit and generate corresponding The feedback signal, the controller controls the light source driving circuit and the scanning unit driving circuit. It is characterized in that: the light source driving circuit has a power modulation unit to regulate the laser power generated by the light source unit. The controller receives the above feedback signal to judge and output the scanning unit. The operating state signal of the unit is sent to the power modulation unit of the light source driving circuit. 2.如权利要求1所述的投影系统,其特征在于:还包括一投影透镜,投影透镜具有一投影成像区域,检测单元包括传感器,传感器位于投影成像区域外。2. The projection system according to claim 1, further comprising a projection lens, the projection lens has a projection imaging area, the detection unit includes a sensor, and the sensor is located outside the projection imaging area. 3.如权利要求2所述的投影系统,其特征在于:所述激光经扫描单元扫描送出后到达投影透镜时形成有一照射区域,传感器接受照射区域的激光并生成所述反馈讯号。3 . The projection system according to claim 2 , wherein an irradiation area is formed when the laser light is scanned by the scanning unit and reaches the projection lens, and the sensor receives the laser light in the irradiation area and generates the feedback signal. 4 . 4.如权利要求1~3任一项所述的投影系统的投影方法,其特征在于,包括以下步骤:4. The projection method of the projection system according to any one of claims 1 to 3, characterized in that it comprises the following steps: (1)启动投影系统,控制器分别向光源驱动电路及扫描单元驱动电路发出驱动讯号,光源驱动电路驱动光源单元生成低功率的激光,扫描单元驱动电路驱动扫描单元;(1) Start the projection system, the controller sends driving signals to the light source driving circuit and the scanning unit driving circuit respectively, the light source driving circuit drives the light source unit to generate low-power laser light, and the scanning unit driving circuit drives the scanning unit; (2)检测单元侦测扫描单元的扫描镜片的运行状态并生成相应的反馈讯号传送给控制器;(2) The detection unit detects the operating state of the scanning mirror of the scanning unit and generates a corresponding feedback signal to the controller; (3)控制器接受上述反馈讯号进行判断扫描镜片运行状态是否正常,并发送讯号给光源驱动电路及其功率调变单元;(3) The controller receives the above feedback signal to judge whether the scanning lens is in normal operation state, and sends a signal to the light source drive circuit and its power modulation unit; (4)功率调变单元接受讯号并对光源单元进行控制。(4) The power modulation unit receives the signal and controls the light source unit. 5.如权利要求4所述的投影系统的投影方法,其特征在于:所述步骤(4)中当扫描镜片运行状态正常时,功率调变单元控制光源单元发出正常功率的激光。5. The projection method of the projection system according to claim 4, characterized in that: in the step (4), when the scanning mirror is operating normally, the power modulation unit controls the light source unit to emit laser light with normal power. 6.如权利要求4所述的投影系统的投影方法,其特征在于:所述步骤(4)中当扫描镜片运行状态不正常时,功率调变单元控制光源单元继续降低激光输出功率。6. The projection method of the projection system according to claim 4, characterized in that: in the step (4), when the scanning mirror is not operating normally, the power modulation unit controls the light source unit to continue reducing the laser output power. 7.如权利要求4所述的投影系统的投影方法,其特征在于:所述步骤(4)中当扫描镜片运行状态不正常时,功率调变单元控制光源单元继续降低激光输出功率。7. The projection method of the projection system according to claim 4, characterized in that: in the step (4), when the scanning mirror is in an abnormal operating state, the power modulation unit controls the light source unit to continue reducing the laser output power.
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CN103676425A (en) * 2012-09-04 2014-03-26 建兴电子科技股份有限公司 Safety protection method suitable for laser projection device
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