WO2021249482A1 - 投影设备 - Google Patents

投影设备 Download PDF

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Publication number
WO2021249482A1
WO2021249482A1 PCT/CN2021/099393 CN2021099393W WO2021249482A1 WO 2021249482 A1 WO2021249482 A1 WO 2021249482A1 CN 2021099393 W CN2021099393 W CN 2021099393W WO 2021249482 A1 WO2021249482 A1 WO 2021249482A1
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WO
WIPO (PCT)
Prior art keywords
signal
screen
assembly
projection screen
drive
Prior art date
Application number
PCT/CN2021/099393
Other languages
English (en)
French (fr)
Inventor
陈许
肖纪臣
Original Assignee
青岛海信激光显示股份有限公司
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 青岛海信激光显示股份有限公司 filed Critical 青岛海信激光显示股份有限公司
Priority to CN202180041925.9A priority Critical patent/CN115769143A/zh
Publication of WO2021249482A1 publication Critical patent/WO2021249482A1/zh

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
    • 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]
    • 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]
    • H04N9/3141—Constructional details thereof

Definitions

  • the present disclosure relates to the field of laser projection display, and in particular to a projection device.
  • the projection screen and the host can be an integral structure.
  • the host of the projection device is provided with a receiving slot, and a screen drive assembly is arranged in the receiving slot, and the screen drive assembly is connected with the projection screen for driving the projection screen to rise or fall.
  • a projection device in one aspect, includes a housing, a signal detector, a projection screen, a screen drive assembly, and a control assembly located in the housing.
  • a receiving groove for accommodating the projection screen is provided on one side of the casing.
  • the signal detector is connected to the control assembly, and is configured to detect whether there is a foreign object at the opening of the accommodating groove in response to a power-on instruction, and when detecting the presence of a foreign object at the opening of the accommodating groove, report to the control
  • the component sends a first detection signal, and when it is detected that there is no foreign object at the opening of the containing groove, it sends a second detection signal to the control component.
  • the control assembly is also connected to the screen drive assembly, and is configured to stop providing an upward drive signal to the screen drive assembly when the first detection signal is received; when the second detection signal is received At this time, an upward drive signal is provided to the screen drive assembly.
  • the screen drive group is connected to the projection screen, and is configured to control the projection screen to rise from the receiving groove under the control of the rising drive signal.
  • a projection device in another aspect, includes a housing, a signal detector, a projection screen, a screen drive assembly, and a control assembly located in the housing.
  • a receiving groove for accommodating the projection screen is provided on one side of the casing.
  • the signal detector is connected to the control assembly, and is configured to detect whether there is a foreign object at the opening of the receiving slot in response to a shutdown instruction, or when the falling distance of the projection screen is greater than a third distance threshold, when When detecting the presence of a foreign object at the opening of the containing groove, when sending a fifth detection signal to the control component, when detecting that there is no foreign object at the opening of the containing groove, sending a sixth detection signal to the control component .
  • the control component is also connected to the screen drive component, and is configured to stop providing a falling drive signal to the screen drive component when the fifth detection signal is received, and when the sixth detection signal is received When a signal is generated, a falling drive signal is provided to the screen drive assembly.
  • the screen drive group is connected to the projection screen, and is configured to control the projection screen to retract into the receiving slot under the control of the descending drive signal.
  • Fig. 1 is a structural diagram of a projection device according to some embodiments.
  • Figure 2 is a structural diagram of another projection device according to some embodiments.
  • Fig. 3 is a structural diagram of yet another projection device according to some embodiments.
  • Fig. 4 is a structural diagram of a signal detector according to some embodiments.
  • FIG. 5 is a structural diagram of still another projection device provided according to some embodiments.
  • Fig. 6 is a structural diagram of yet another projection device according to some embodiments.
  • FIG. 7 is a structural diagram of still another projection device according to some embodiments.
  • Fig. 8 is a structural diagram of still another projection device according to some embodiments.
  • FIG. 9 is a structural diagram of still another projection device according to some embodiments.
  • FIG. 10 is a structural diagram of yet another projection device according to some embodiments.
  • FIG. 11 is a structural diagram of still another projection device according to some embodiments.
  • Fig. 12 is a structural diagram of a shielding rod according to some embodiments.
  • FIG. 13 is a structural diagram of still another projection device according to some embodiments.
  • Fig. 14 is a diagram of a pulse signal sequence according to some embodiments.
  • FIG. 15 is a diagram of another pulse signal sequence according to some embodiments.
  • FIG. 16 is a flowchart of a method for controlling the elevation of a projection screen according to some embodiments.
  • FIG. 17 is a flowchart of another method for controlling the elevation of a projection screen according to some embodiments.
  • Fig. 18 is a flowchart of yet another method for controlling the elevation of a projection screen according to some embodiments.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features.
  • plural means two or more.
  • connection may be used when describing some embodiments to indicate that two or more components are in direct physical or electrical contact with each other.
  • the term “connected” may also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other.
  • the embodiments disclosed herein are not necessarily limited to the content of this document.
  • Fig. 1 shows a schematic structural diagram of a projection device according to some embodiments.
  • Fig. 2 shows a schematic structural diagram of another projection device according to some embodiments.
  • the projection device may include a housing 10, a signal detector 20, a projection screen 30, a screen drive assembly 40, and a control assembly 50 located in the housing 10.
  • one side of the casing 10 is provided with a receiving groove 00 for accommodating the projection screen 30, and one end of the projection screen 30 can be fixed in the receiving groove 00.
  • the signal detector 20 is connected to the control assembly 50, and the signal detector 20 is configured to detect whether there is a foreign object at the opening of the containing tank 00 in response to a power-on command, and when it is detected that there is a foreign object at the opening of the containing tank 00 When there is a foreign object, the first detection signal is sent to the control component 50. When it is detected that there is no foreign matter at the opening of the containing tank 00, a second detection signal is sent to the control assembly 50.
  • the control component 50 may activate the signal detector 20 after receiving the power-on instruction for the projection device, and may send the power-on instruction to the signal detector 20.
  • the signal detector 20 can detect whether there is a foreign object at the opening of the accommodating slot 00 in response to the power-on instruction.
  • foreign objects refer to objects that can block the opening of the containing groove 00.
  • the foreign object may be a water cup, a toy, or a user's hand.
  • control assembly 50 is connected to the screen drive assembly 40, and the control assembly 50 is configured to stop providing the up drive signal to the screen drive assembly 40 when the first detection signal is received; when the second detection signal is received When it is a signal, an upward drive signal is provided to the screen drive assembly 40.
  • the screen drive assembly 40 is connected to the projection screen 30, and the screen drive assembly 40 is configured to receive the control of the rising drive signal, and control the projection screen 30 to rise out of the accommodating groove 00, or retract to accommodate Slot 00.
  • the projection screen 30 when the projection device is in the closed state, the projection screen 30 is located in the receiving groove 00.
  • the control component 50 can turn on the signal detector 20 and can send the power-on instruction to the signal detector 20.
  • the signal detector 20 can further detect whether there is a foreign object at the opening of the containing tank 00 in response to the power-on instruction, and send a first detection signal to the control component 50 when detecting the presence of a foreign object at the opening of the containing tank 00.
  • the control component 50 After the control component 50 receives the first detection signal, it may not provide the ascending drive signal to the screen driving assembly 40, so as to avoid the situation that the projection screen is blocked by foreign objects during the ascending process and cannot rise.
  • the signal detector 20 When the signal detector 20 detects that there is no foreign object at the opening of the containing tank 00, it may send a second detection signal to the control component 50. After the control component 50 receives the second detection signal, it can provide a rising drive signal to the screen drive component 40, and the screen drive component 40 can control the projection screen 30 to rise from the accommodating slot 00 from the state shown in FIG. 3 to The state shown in Figure 1. Moreover, the control component 50 can turn off the signal detector 20 after receiving the second detection signal.
  • some embodiments of the present disclosure provide a projection device.
  • the signal detector in the projection device can detect whether there is a foreign object at the opening of the receiving slot in response to a power-on instruction.
  • a first detection signal is sent to the control component.
  • the control component can stop providing the ascending driving signal to the screen driving component. Therefore, when there is a foreign object at the opening of the accommodating groove, the situation that the projection screen is blocked by the foreign object and cannot rise when the projection screen rises is avoided, thereby improving the reliability of the projection screen rise control.
  • the signal detector 20 may include a signal transmitter 21 and a signal receiver 22.
  • the signal transmitter 21 is used for transmitting detection signals
  • the signal receiver 22 is used for receiving the detection signals transmitted by the signal transmitter 21. If the signal receiver 22 does not receive the detection signal emitted by the signal transmitter 21, the signal receiver 22 can determine that there is a foreign object at the opening of the containing tank 00, and can send the first detection signal to the control component 50. If the signal receiver 22 receives the detection signal emitted by the signal transmitter 21, the signal receiver 22 can determine that there is no foreign object at the opening of the containing tank 00, and then send a second detection signal to the control component 50.
  • the signal transmitter 21 and the signal receiver 22 are arranged oppositely on both sides of the receiving groove 00, where the signal detector 20 may be a projection type infrared sensor or a projection type non-infrared sensor.
  • the opening of the receiving groove 00 may be quadrangular, and in a possible implementation, the opening of the receiving groove 00 may be rectangular.
  • the signal transmitter 21 and the signal receiver 22 may be oppositely arranged on both sides of the long side of the opening of the receiving groove 00, and the signal transmitter 21 emits a detection signal along the extending direction of the long side of the opening of the receiving groove 00.
  • the signal transmitter 21 and the signal receiver 22 may also be arranged on both sides of the short side of the opening of the receiving groove 00 oppositely, and the signal transmitter 21 emits detection signals along the extension direction of the short side of the opening of the receiving groove 00.
  • the signal receiver 22 can determine that there is no foreign object at the opening of the containing groove 00. If the signal receiver 22 cannot receive the detection signal sent by the signal transmitter 21, the signal receiver 22 can determine that there is a foreign object at the opening of the accommodating slot 00.
  • the signal transmitter 21 and the signal receiver 22 are both arranged on one side of the accommodating groove 00.
  • the signal transmitter 21 and the signal receiver 22 may both be arranged on one side of the long side of the opening of the receiving groove 00.
  • the signal transmitter 21 and the signal receiver 22 may both be arranged on one side of the short side of the opening of the receiving groove 00.
  • the signal receiver 22 can determine to accommodate There is a foreign object at the opening of the slot 00, that is, after the detection signal emitted by the signal transmitter 21 is reflected by the foreign object, the signal receiver 22 receives the detection signal. If the signal receiver 22 does not receive the detection signal sent by the signal transmitter 21, the signal receiver 22 can determine that there is no foreign object at the opening of the receiving slot 00.
  • the signal transmitter 21 and the signal receiver 22 are both arranged in the receiving groove 00.
  • the screen drive assembly 40 may include a crossbar assembly 41, and the crossbar assembly 41 is connected to the projection screen 30.
  • the crossbar assembly 41 has a light-transmitting area 01, the orthographic projection of the signal transmitter 21 on the crossbar assembly 41, and the orthographic projection of the signal receiver 22 on the crossbar assembly 41 are all located in the light-transmitting area 01 of the crossbar assembly 41 .
  • the detection signal emitted by the signal transmitter 21 can pass through the crossbar assembly 41, so as to avoid the detection signal emitted by the signal transmitter 21 being blocked by the crossbar assembly 41, which causes the signal receiver 22 to fail to receive the detection signal and cause errors.
  • the condition of judgment ensures the reliability of foreign body detection.
  • the signal detector 20 may be a transmitting infrared sensor or a reflective non-infrared sensor.
  • one of the signal transmitter 21 and the signal receiver 22 is arranged in the receiving groove 00, and the other is arranged on the cross bar assembly 41.
  • the signal transmitter 21 may be arranged in the receiving groove 00
  • the signal receiver 22 may be arranged on the crossbar assembly 41.
  • the crossbar assembly 41 has a light-transmitting area 01, and the signal transmitter 21 is positioned on the crossbar assembly 41.
  • the projection and the orthographic projection of the signal receiver 22 on the crossbar assembly 41 are both located in the light-transmitting area 01 of the crossbar assembly 41.
  • the detection signal emitted by the signal transmitter 21 may pass through the crossbar assembly 41. If the signal receiver 22 receives the detection signal sent by the signal transmitter 21, the signal receiver 22 can determine that there is a foreign object at the opening of the containing slot 00, that is, the detection signal transmitted by the signal transmitter 21 is passed through the crossbar assembly 41 and then is covered by the foreign object. After reflection, the reflected detection signal passes through the crossbar assembly 41 and is received by the signal receiver 22 again.
  • the detection signal emitted by the signal transmitter 21 can pass through the crossbar assembly 41, and the detection signal reflected by foreign objects can also pass through the crossbar assembly 41, so as to avoid the detection signal emitted by the signal transmitter 21 and the detection signal reflected by the foreign object.
  • the detection signal is blocked by the crossbar assembly 41, which causes the signal receiver 22 to fail to receive the detection signal and misjudgment occurs, which ensures the reliability of the detection of foreign objects.
  • the screen driving assembly 40 may further include a screen driving circuit 42, a motor 43, a lifting rod 44 and a lifting rod driving assembly 45.
  • the motor 43 may also be referred to as a motor.
  • the screen drive circuit 42 is respectively connected to the control assembly 50 and the motor 43, and the screen drive circuit 42 is configured to provide a first drive current to the motor 43 in response to the rising drive signal.
  • the lifting rod drive assembly 45 is respectively connected with the motor 43 and the lifting rod 44, and the motor 43 is used for driving the lifting rod driving assembly 45 to push the lifting rod 44 up under the driving of the first driving current.
  • the lifting rod 44 is connected to the crossbar assembly 41, and the lifting rod 44 is used to push the crossbar assembly 41 up under the pushing of the lifting rod driving assembly 45, thereby pushing the projection screen 30 up.
  • the screen driving assembly 40 may include a guide rail 02 arranged in the receiving groove 00, and two driving sub-assemblies arranged on opposite sides of the receiving groove 00.
  • Each driving sub-assembly includes a screen driving circuit 42, A motor 43, a lifting rod 44, and a lifting rod drive assembly 45.
  • Each lift rod driving assembly 45 includes a slider driving subassembly, a slider 450 and a power rod 451.
  • Each lifting rod 44 may include a first rod 440, a second rod 441, and an elastic component 442 for connecting the two rods.
  • the motor 43 is connected to a corresponding screen driving circuit 42.
  • One end of the first rod 440 is connected with one end of the crossbar assembly 41, the other end is connected with one end of the second rod 441 through an elastic assembly 442, and the other end of the second rod 441 is connected with the guide rail 02.
  • One end of the power rod 451 is connected to the sliding block 450, and the other end of the power rod 451 is connected to the side wall of the second rod body 441 close to the end of the guide rail 02.
  • Each motor 43 is driven by the first driving current provided by the corresponding screen drive circuit 42 to drive each slider driving subassembly to push the corresponding slider 450 to slide along the guide rail 02 toward the side close to the motor 43 to push
  • the power rod 451 moves toward the side close to the motor 43.
  • the power rod 451 can then push the first rod body 440 up through the second rod body 441, and then push the lifting rod 44 up.
  • the projection device may further include a position detector 60, the position detector 60 may be arranged in the containing groove 00, and the position detector 60 is connected to the control assembly 50.
  • the position detector 60 is used for detecting whether the projection screen 30 is at the top position in response to the power-on instruction. When it is detected that the projection screen 30 is at the top position, a third detection signal is sent to the control component 50, and when it is detected that the projection screen 30 is not at the top position, a fourth detection signal is sent to the control component 50.
  • the control component 50 is configured to, when receiving the third detection signal, determine that the projection screen 30 is currently at the top position, and then can stop providing the upward driving signal to the screen driving component 40, and provide the screen driving component 40 with holding Signal.
  • the fourth detection signal it can be determined that the projection screen 30 has not yet reached the top position, and then the screen drive assembly 40 can be provided with an upward driving signal.
  • the screen driving assembly 40 is configured to control the projection screen 30 to remain at the top position under the control of the maintaining drive signal, and to control the projection screen 30 to rise under the control of the rising drive signal.
  • the projection device may further include a multimedia component 70, and the multimedia component 70 may include an audio and video control circuit 71, and the audio and video control circuit 71 is connected to the control component 50.
  • the casing 10 of the projection device may be provided with a start button, and the audio and video control circuit 71 may generate a start-up instruction when detecting a user's click operation on the start-up button, and may send the start-up instruction to the control component 50.
  • the control component 50 can start the position detector 60 and send the start-up instruction to the position detector 60 at the same time.
  • the position detector 60 can further detect whether the projection screen 30 is at the top position in response to the power-on instruction.
  • the power-on instruction may be triggered by the user through the remote control, and the audio and video control circuit 71 may send the power-on instruction to the control component 50 after receiving the power-on instruction sent by the remote control.
  • the control component 50 can start the position detector 60 and can send the power-on instruction to the position detector 60.
  • the position detector 60 can respond to the power-on instruction to detect whether the projection screen 30 is at the top position.
  • a communication interface may be provided on the multimedia component 70 and the control component 50.
  • the multimedia component 70 and the control component 50 can be connected through the communication interface, and transmit the boot command according to the serial communication protocol.
  • the communication interface may be a standard (recommeded standard, RS) 232 communication interface.
  • the position detector 60 can detect in real time whether the projection screen 30 is at the top position. When it is detected that the projection screen 30 is still not at the top position, the fourth detection signal can be sent to the control component 50 continuously. The control component 50 continues to send an upward driving signal to the screen driving component 40 to control the projection screen 30 to rise. This cycle is repeated until the position detector 60 detects that the projection screen 30 is at the top position, the position detector 60 can send a third detection signal to the control component 50. After receiving the third detection signal, the control component 50 can stop sending the upward driving signal to the screen driving component 40 and provide a holding signal to the screen driving component 40. The screen drive assembly 40 can respond to the hold signal to control the projection screen 30 to be at the top position unchanged.
  • the screen driving assembly 40 may further include a shielding rod 47, and the motor 43 includes a rotating shaft 430 on which the shielding rod 47 is arranged.
  • the motor 43 is also used to drive the shielding rod 47 to rotate under the driving of the first driving current.
  • the shielding rod 47 and the position detector 60 are arranged opposite to each other, and the position detector 60 will be shielded during the rotation of the shielding rod 47.
  • the position detector 60 is also configured to, in response to the power-on command, count the number of rotations m of the blocking lever 431, and detect whether the number of rotations m is less than or equal to the number of rotations threshold M, if the number of rotations m is equal to the number of rotations threshold M, determine The projection screen 30 is at the top position. If the number of rotations m is less than the threshold M of the number of rotations, it is determined that the projection screen 30 is not at the top position.
  • the lap threshold M is a fixed value stored in advance in the position detector 60.
  • the position detector 60 may include a transmitter and a receiver, the transmitter is used to transmit an optical signal, and the receiver is used to receive the transmitter and is used to transmit the optical signal. If the light path between the transmitter and the receiver is not blocked, the receiver can receive the light signal emitted by the transmitter, and the receiver cannot detect the pulse signal at this time. If the light path between the transmitter and the receiver is blocked, the receiver cannot receive the light signal emitted by the transmitter, and the receiver can detect a pulse signal at this time.
  • the shielding rod 47 may include h shielding portions 470 and a connecting rod 471, one end of the connecting rod 471 is sleeved on the rotating shaft 430, and the other end of the connecting rod 471 is connected to the shielding portion 470.
  • FIG. 12 shows that the shielding rod 47 includes three shielding portions, which are a first shielding portion 4701 and two second shielding portions 4702 respectively.
  • the first shielding portion 4701 is located on one side of the connecting rod 471, and one end of the first shielding portion 4701 is connected to one end of the two second shielding portions 4702, respectively.
  • the two second shielding portions 4702 are located on the other side of the connecting rod 471, and one ends of the two second shielding portions 4702 are also connected to each other.
  • h is a positive integer greater than zero.
  • the position detector 60 can detect a pulse signal sequence with a period T.
  • h blocking parts 470 sequentially block the position detector 60, and the position detector 60 can detect h pulse signals.
  • the screen drive circuit 42 provides a first drive current to the motor 43 under the control of the rising drive signal provided by the control component 50.
  • the connecting rod 471 is driven to rotate in the first direction, and the shielding portion 470 is driven to rotate in the first direction.
  • the first direction may be a clockwise direction.
  • the position detector 60 can detect a pulse signal sequence with a period T during the rotation of the rotating shaft 430 in the first direction. And within a period T, if the two second shielding portions 4702 sequentially shield the position detector 60, the position detector 60 can detect two pulse signals with a shorter time interval during the t1 period. If the first shielding portion 4701 shields the position detector 60, the position detector 60 can detect a pulse signal in the t2 time period.
  • the position detector 60 detects a total of k pulse signals. Since the rotating shaft 430 in the motor 43 rotates once, the position detector 60 can detect a pulse signal sequence with a period T. And in this one period T, the position detector 60 can detect h pulse signals. Therefore, the position detector 60 can count the number of rotations of the shielding rod 47 as m, and the number of rotations m satisfies: Among them, k is a positive integer greater than 0.
  • the number of rotations m may be less than the number of revolutions M.
  • the motor 43 needs to rotate N step angles when the projection screen 30 moves from the initial position to the top position. If the step angle is ⁇ degrees .
  • One rotation of the motor 43 is 360 degrees, and one rotation requires n step angles, then Then the projection screen 30 moves from the initial position to the top position, the motor 43 needs to rotate y circle, Among them, N and ⁇ are both greater than zero.
  • the position detector 60 can detect a pulse signal sequence with a period T. And in this one period T, the position detector 60 can detect h pulse signals. Therefore, the rotating shaft 430 in the motor 43 rotates y times, and the position detector 60 can detect h ⁇ y pulse signals. Then according to the number of pulse signals detected when the projection screen 30 moves from the initial position to the top position, and the number of pulse signals detected in each period T, the lap threshold M can be determined, and the lap threshold
  • the control component 50 is configured to obtain the moving distance of the projection screen 30 in the detection period every detection period during the process of controlling the projection screen 30 to be raised from the accommodating slot 00. And respectively detect whether the moving distance is greater than the first distance threshold. If the moving distance is greater than the first distance threshold, indicating that the moving speed of the projection screen 20 is relatively fast, the frequency of the rising driving signal provided to the screen driving assembly 40 is reduced, thereby reducing the moving speed of the projection screen 30. If the moving distance is less than or equal to the first distance threshold, it is detected whether the moving distance is less than the second distance threshold. If the moving distance is less than the second distance threshold, it indicates that the moving speed of the projection screen 30 is relatively slow, and then the screen is increased. The frequency of the driving signal provided by the driving component 40 increases, thereby increasing the moving speed of the projection screen 30.
  • the moving speed of the projection screen 30 is positively correlated with the frequency, that is, the greater the frequency of the rising drive signal, the faster the moving speed of the projection screen 30; The lower the frequency of the driving signal, the slower the moving speed of the projection screen 30.
  • the moving speed of the projection screen 30 can be dynamically adjusted according to the moving distance of the projection screen 30 in the detection period, the accuracy of the projection screen 30 is improved.
  • the flexibility of the ascending control of the projection screen since the moving speed of the projection screen 30 can be dynamically adjusted according to the moving distance of the projection screen 30 in the detection period, the accuracy of the projection screen 30 is improved.
  • the projection device may further include a distance detector 80 which is provided on at least one side of the receiving groove 00.
  • a distance sensor 80 is provided on either side of the long side of the opening of the receiving groove 00.
  • the distance detector 80 is provided on both sides of the long side of the opening of the receiving groove 00.
  • the distance detector 80 may be an infrared sensor or a non-infrared sensor.
  • the distance detector 80 is connected to the control assembly 50, and the distance detector 80 is used for emitting light signals and receiving light signals reflected by the crossbar assembly 41.
  • the control component 50 is further configured to determine the moving distance d of the projection screen 30 in the detection period according to the transmission time t3 when the distance detector 80 emits the light signal and the reception time t4 when the light signal reflected by the crossbar component 41 is received. Wherein, the t3 and t4 are both greater than zero.
  • the transmission speed V of the optical signal is pre-stored in the control component 50.
  • the control component 50 obtains the transmission time t3 of the optical signal emitted by the distance detector 80 and the reception time t4 of the optical signal reflected by the crossbar component 41 received by the distance detector 80 every detection period. And according to the transmitting time t3 of the optical signal and the receiving time t4 of the optical signal, the transmission time length T1 of the optical signal in the detection period is determined.
  • control component 50 can determine the moving distance d of the projection screen 30 in the detection period according to the transmission speed V and the transmission duration T1 of the optical signal stored in advance.
  • the moving distance d satisfies:
  • both sides of the long side of the opening of the receiving groove 00 are provided with distance detectors 80. Then the control component 50 can determine two moving distances based on the two distance detectors 80. The control component 50 can use the average value of the two moving distances as the moving distance of the projection screen 30 in the detection period.
  • the distance detector 80 is provided on both sides of the long side of the opening of the accommodating groove 00.
  • the control component 50 determines two moving distances according to the two distance detectors every detection period. It can then be detected whether the difference between the two moving distances is greater than the difference threshold. If the difference is greater than the difference threshold, it indicates that the difference in the moving distances on both sides of the projection screen 30 is large, and then the frequency of the rising drive signal provided to any screen drive circuit 42 is adjusted to ensure that the two sides of the projection screen 30 The difference in the moving distance is within a constant range. If the difference is less than or equal to the difference threshold, it indicates that the difference in the moving distance between the two sides of the projection screen 30 is small, and there is no need to adjust the frequency of the rising drive signal provided to the two screen drive circuits 42.
  • the screen drive circuit 42 that drives one side of the projection screen 30 to move a larger distance is the first screen drive circuit, which drives the other side of the projection screen 30
  • the screen drive circuit 42 with a smaller moving distance is the second screen drive circuit.
  • the control component 50 can reduce the frequency of the rising drive signal provided to any screen drive circuit 42 to the first screen drive circuit.
  • the frequency of the provided driving signal is increased, thereby reducing the moving speed of the side of the projection screen 30.
  • the control component 50 can increase the frequency of the rising drive signal provided to the second screen drive circuit, thereby increasing the moving speed of the other side of the projection screen 30.
  • some embodiments of the present disclosure provide a projection device.
  • the signal detector in the projection device can send a first detection signal to the control component when it detects the presence of a foreign object at the opening of the containing groove.
  • the control component can stop providing the ascending driving signal to the screen driving component. Therefore, when there is a foreign object at the opening of the accommodating groove, the situation that the projection screen is blocked by the foreign object and cannot rise when the projection screen rises is avoided, thereby improving the reliability of the projection screen rise control.
  • the signal detector 20 is also used to detect whether there is a foreign object at the opening of the receiving slot 00 in response to a shutdown instruction, or when the falling distance of the projection screen 30 is greater than the third distance threshold, and When a foreign object is detected at the opening of the containing tank 00, a fifth detection signal is sent to the control assembly 50. When it is detected that there is no foreign matter at the opening of the containing tank 00, a sixth detection signal is sent to the control assembly 50.
  • the control component 50 may activate the signal detector 20 and send the shutdown instruction to the signal detector 20.
  • the signal detector 20 can detect whether there is a foreign object at the opening of the containing tank 00 in response to the shutdown instruction.
  • the control component 50 can obtain the falling distance of the projection screen 30 in real time, and detect whether the falling distance is greater than the third distance threshold. If the falling distance is greater than the third distance threshold, it is determined that the projection screen 30 falls within the detection range of the signal detector 20.
  • the control component 50 can activate the signal detector 20, and the signal detector 20 can detect whether there is a foreign object at the opening of the containing tank 00.
  • the third distance threshold is a fixed value pre-stored in the control component 50.
  • control component 50 is further configured to stop providing the down driving signal to the screen driving component 40 when the fifth detection signal is received.
  • a down driving signal is provided to the screen driving assembly 40.
  • the screen drive assembly 40 is connected to the projection screen 30, and the screen drive assembly 40 is used to control the projection screen 30 to retract into the receiving slot 00 under the control of the falling drive signal.
  • the control component 50 when the projection device is in the on state, the projection screen 30 is in the on state.
  • the control component 50 can turn on the signal detector 20 again, and the signal detector 20 can then detect whether there is a foreign object at the opening of the accommodating slot 00, and detect that there is a foreign object at the opening of the accommodating slot 00
  • a fifth detection signal is sent to the control component 50.
  • the control component 50 stops providing the downward driving signal to the screen driving component 40, so as to avoid the situation that the projection screen is blocked by foreign objects during the downward process and cannot be retracted into the receiving slot 00.
  • the signal detector 20 When the signal detector 20 detects that there is no foreign object in the containing groove 00, it can send a sixth detection signal to the control component 50. After receiving the sixth detection signal, the control component 50 provides a downward driving signal to the screen driving component 40, Thus, the projection screen 30 is controlled to be retracted into the receiving slot 00 from the state shown in FIG. 1.
  • some embodiments of the present disclosure provide a projection device.
  • the signal detector in the projection device can respond to a shutdown command, or detect the receiving slot when the projection screen falls by a distance greater than the third distance threshold. Whether there is a foreign body in the opening of the device.
  • a fifth detection signal is sent to the control component.
  • the control component can stop providing the down driving signal to the screen driving component. Therefore, when there is a foreign object at the opening of the accommodating groove, the situation that the projection screen is blocked by the foreign object and cannot be lowered when the projection screen is lowered is avoided, thereby improving the reliability of the control of the projection screen falling.
  • the signal detector 20 includes a signal transmitter 21 and a signal receiver 22.
  • the signal transmitter 21 and the signal receiver 22 are oppositely arranged on both sides of the accommodating groove 00.
  • the signal transmitter 21 and the signal receiver 22 are both arranged on one side of the accommodating groove 00; or, the signal transmitter 21 and the signal receiver 22 are both arranged in the accommodating groove 00.
  • one of the signal transmitter 21 and the signal receiver 22 is arranged in the receiving groove 00, and the other is arranged on the cross bar assembly 41.
  • the detection signal emitted by the signal transmitter 21 can pass through the crossbar assembly 41. If the signal receiver 22 receives the detection signal sent by the signal transmitter 21, the signal receiver 22 can determine the opening of the accommodating slot 00 There are no foreign objects. If the signal receiver 22 cannot receive the detection signal sent by the signal transmitter 21, the signal receiver 22 can determine that there is a foreign object at the opening of the accommodating slot 00.
  • the screen driving circuit 42 is also used to provide a second driving current to the motor 43 in response to the falling driving signal.
  • the motor 43 is used for driving the lifting rod drive assembly 45 to pull the lifting rod 44 down under the driving of the second driving current.
  • the lifting rod 44 is also used for pulling the cross bar assembly 41 down under the pulling of the lifting rod driving assembly 45, thereby pulling the projection screen 30 down.
  • each motor 43 is driven by the second driving current provided by the corresponding screen drive circuit 42 to drive each slider driving subassembly to push the corresponding slider 450 along the guide rail 02 toward the side away from the motor 43 Slide to push the power rod 451 to move toward the side away from the motor 43.
  • the power rod 451 in turn can pull the first rod body 440 down through the second rod body 441, and then pull the lifting rod 44 down.
  • the position detector 60 is also used to detect whether the projection screen 30 is in the initial position in response to the shutdown instruction, and when it is detected that the projection screen 30 is in the initial position, it sends a seventh detection signal to the control component 50, and when When it is detected that the projection screen 30 is not in the initial position, an eighth detection signal is sent to the control component 50.
  • the control component 50 is configured to, when receiving the seventh detection signal, determine that the projection screen 30 is currently at the initial position, then stop providing the downward driving signal to the screen driving component 40. When the eighth detection signal is received, it is determined that the projection screen 30 is not currently in the initial position, and then a downward driving signal is sent to the screen drive assembly 40.
  • the screen drive assembly 40 is also configured to control the projection screen 30 to descend under the control of the descending drive signal.
  • buttons are provided on the casing 10 of the projection device.
  • the audio and video control circuit 71 generates a shutdown instruction when detecting a user's click operation on the shutdown button, and sends the shutdown instruction to the control component 50.
  • the control component 50 activates the position detector 60 and sends the shutdown instruction to the position detector 60.
  • the position detector 60 detects whether the projection screen 30 is in the initial position in response to the shutdown instruction. .
  • the shutdown instruction is triggered by the user through the remote control, and the audio and video control circuit 71 sends the shutdown instruction to the control component 50 after receiving the shutdown instruction sent by the remote control.
  • the control component 50 activates the position detector 60 and sends the shutdown instruction to the position detector 60.
  • the position detector 60 detects whether the projection screen 30 is in the initial position in response to the shutdown instruction. .
  • the position detector 60 detects in real time whether the projection screen 30 is in the initial position while the screen driving assembly 40 controls the projection screen 30 to descend. If it is detected that the projection screen 30 is not yet in the initial position, it continues to send the eighth detection signal to the control component 50. After the control component 50 receives the eighth detection signal, it determines that the projection screen 30 is not yet in the initial position, and then continues A descending drive signal is sent to the screen drive assembly 40 to control the projection screen 30 to descend. This cycle continues until the position detector 60 sends a fifth detection signal to the control component 50 after detecting that the projection screen 30 is in the initial position. After receiving the seventh detection signal, the control component 50 stops providing the screen drive component 40 Drive signal down.
  • the position detector 60 is further configured to, in response to a shutdown instruction, count the number of rotations m of the blocking lever 431 in a fixed period, and detect whether the number of rotations m is less than or equal to the number of rotations threshold M. If the number of rotations is equal to the threshold M, it is determined that the projection screen 30 is at the initial position. If the number of rotations m is less than the threshold value M of the number of rotations, it is determined that the projection screen 30 is not in the initial position.
  • the screen drive circuit 42 provides a second drive current to the motor 43 under the control of the drop drive signal provided by the control component 50.
  • the connecting rod 471 is driven to rotate in the second direction, and the shielding portion 470 is driven to rotate in the second direction.
  • the second direction may be a counterclockwise direction.
  • the position detector 60 can detect a pulse signal sequence of one period T during the process of rotating the rotating shaft 430 one circle in the second direction.
  • this period T if the first shielding portion 4701 shields the position detector 60, the position detector 60 detects a pulse signal in the t5 time period; if the two second shielding portions 4702 sequentially shield the position detector 60, then The position detector 60 sequentially detects two pulse signals with a shorter time interval in the t6 time period.
  • the calculation method of the circle number threshold M and the rotation circle number m can refer to the above-mentioned control of the projection screen 30 from the initial position.
  • the number of revolutions threshold M and the number of revolutions m are calculated.
  • control component 50 is further configured to obtain the descending distance of the projection screen 30 during the process of controlling the projection screen 30 to retract the receiving slot 00. If the descending distance is greater than the fourth distance threshold, the signal detector 20 is turned off, and the frequency of the descending driving signal provided to the screen driving assembly 40 is increased.
  • the descending distance refers to the distance between the side where the projection screen 30 is connected to the crossbar assembly 41 and the housing 10.
  • the fourth distance threshold is greater than the third distance threshold, and the fourth distance threshold is a fixed value pre-stored in the control component 50.
  • the control component 50 can obtain the descending distance of the projection screen 30 in real time during the process of controlling the projection screen 30 to retract the receiving slot 00, and determine whether the descending distance is greater than the fourth distance threshold.
  • the distance between the sheet 30 and the housing 10 is relatively short, for example, the distance may be 30 millimeters (mm), and the control assembly 50 turns off the signal detector 20 while increasing the drop driving signal provided to the screen drive assembly 40. Frequency so that the projection screen 30 quickly retracts into the receiving slot 00.
  • control component 50 is further configured to obtain the moving distance of the projection screen 30 in the detection period every detection period during the process of controlling the projection screen 30 to retract the accommodating slot 00. And respectively detect whether the moving distance is greater than the first distance threshold. If the moving distance is greater than the first distance threshold, indicating that the moving speed of the projection screen 20 is relatively fast, the frequency of the down driving signal provided to the screen driving assembly 40 is reduced, thereby reducing the moving speed of the projection screen 30. If the moving distance is less than or equal to the first distance threshold, it is detected whether the moving distance is less than the second distance threshold. If the moving distance is less than the second distance threshold, it indicates that the moving speed of the projection screen 30 is relatively slow, and then the screen is increased. The frequency of the driving signal provided by the driving component 40 is reduced, thereby increasing the moving speed of the projection screen 30.
  • the moving speed of the projection screen 30 is positively correlated with the frequency, that is, the greater the frequency of the falling drive signal, the faster the moving speed of the projection screen 30; The lower the frequency of the driving signal, the slower the moving speed of the projection screen 30.
  • the moving speed of the projection screen 30 can be dynamically adjusted according to the moving distance of the projection screen 30 in the detection period, the movement speed of the projection screen 30 is improved.
  • the flexibility of the film lift control since the moving speed of the projection screen 30 can be dynamically adjusted according to the moving distance of the projection screen 30 in the detection period, the movement speed of the projection screen 30 is improved.
  • the control assembly 50 can according to the distance detector 80 transmit the light signal emission time t3 and receive the light signal reflected by the crossbar assembly 41 at the receiving time t4, Determine the moving distance d of the projection screen 30 in the detection period.
  • the control assembly 50 can determine two moving distances according to the two distance detectors 80.
  • the control component 50 can use the average value of the two moving distances as the moving distance of the projection screen 30 in the detection period.
  • control component 50 can also determine the descending distance of the projection screen 30 according to the distance detector 80, wherein the light signal is emitted at the time when the control component 50 provides the downward driving signal to the screen driving component 40 The moment.
  • control component 50 can determine two descending distances based on the two distance detectors 80.
  • the control component 50 can use the average value of the two descending distances as the descending distance of the projection screen 30.
  • the distance detector 80 is provided on both sides of the long side of the opening of the accommodating groove 00. Then, in the process of controlling the descending of the projection screen 30 by the two motors 43, the control component 50 determines the two moving distances according to the two distance detectors every detection period. It can be detected whether the difference between the two moving distances is greater than the difference threshold. If the difference is greater than the difference threshold, it indicates that the difference in the moving distance between the two sides of the projection screen 30 is large. Therefore, the frequency of the down drive signal provided to any screen drive circuit 42 can be adjusted to ensure that both sides of the projection screen 30 The difference in the moving distance of is within a constant range. If the difference is less than or equal to the difference threshold, it indicates that the difference in the moving distance between the two sides of the projection screen 30 is small, and there is no need to adjust the frequency of the down drive signal provided to the two screen drive circuits 42.
  • control component 50 can reduce the frequency of the down drive signal provided to one screen drive circuit 42 during the process of adjusting the frequency of the down drive signal provided to any screen drive circuit 42. This reduces the moving speed of one side of the projection screen 30.
  • control component 50 can increase the frequency of the down drive signal provided to another screen drive circuit 42, thereby increasing the moving speed of the other side of the projection screen 30.
  • the multimedia component 70 includes a power amplifier component 72 and a speaker 73, and the power amplifier component 72 is connected to the audio and video control circuit 71 and the speaker 74 respectively.
  • the control component 50 receives the first detection signal sent by the signal detector 20, it sends an alarm information to the audio and video control circuit 71, and the audio and video control circuit 71 sends the alarm information to the power amplifier component after receiving the alarm information 72.
  • the power amplifier component 72 drives the speaker 74 to emit an alarm sound, thereby prompting the user to remove the foreign object in time.
  • the projection device may further include an eye protection component 90 and a display control component 100, and the eye protection component 90 is disposed on the front side of the housing 10.
  • the eye protection component 90 includes a human eye protection sensor 91, an amplifier circuit 92, a comparison circuit 93 and a trigger 94.
  • the display control component 100 includes a display drive circuit 1001 and a slave control circuit 1002.
  • the slave control circuit 1002 may be a microcontroller (microcontroller unit, MCU).
  • the amplifying circuit 92 is connected to the eye protection sensor 91 and the comparison circuit 93 respectively, and the trigger 94 is connected to the comparison circuit 93 and the slave control circuit 1002 respectively.
  • the slave control circuit 1002 is connected to the audio and video control circuit 71.
  • the eye protection sensor 90 may be an infrared sensor or a non-infrared sensor.
  • the eye protection sensor 91 is used to detect the distance between the human body and the projection device, and send the detected distance to the amplifying circuit 92 and
  • the comparison circuit 93 is configured to compare the distance with a pre-stored distance threshold, and if the distance threshold is less than the distance threshold, then provide a control signal to the flip-flop 94.
  • the slave control circuit 1002 detects that the number of pulse signals output by the trigger 94 in a unit time is greater than the number threshold, it can determine that the human body is close to the projection device, that is, it is possible that the human body is blocking the rise or fall of the projection screen. sex.
  • the slave control circuit 1002 can send alarm information to the audio and video control circuit 71, and the audio and video control circuit 71 can send the received alarm information to the power amplifier assembly 72, which drives the speaker 74 to emit an alarm sound , To remind the user to stay away from the projection screen 30.
  • the projection device further includes a light source driving assembly 110 and a laser light source 120.
  • the laser light source 120 is used to emit laser light.
  • the laser light source 120 includes a red laser, a green laser component, a blue laser component, and a yellow laser component.
  • the light output side of each laser is provided with a glass lens with a light combining function.
  • the multimedia component 70 also includes a first memory 73.
  • the first memory 73 is connected to the audio and video control circuit 71.
  • the first memory 73 is used to store the image to be projected and displayed.
  • the audio and video control circuit 71 is also used to obtain the image to be projected and displayed from the first memory 73, and send the image to be projected and displayed to the slave control circuit 1002, and then to the display drive circuit 1001.
  • the display driving circuit 1001 outputs the red PWM signal R_PWM corresponding to the red laser component based on the red primary color component of the image to be displayed, and outputs the green PWM signal G_PWM corresponding to the green laser component based on the green primary color component of the image to be displayed.
  • the color primary color component outputs a blue PWM signal B_PWM corresponding to the blue laser component, and outputs a yellow PWM signal Y_PWM corresponding to the yellow laser component based on the yellow primary color component of the image to be displayed.
  • the display driving circuit 1001 can output the enable signal R_EN corresponding to the red laser component based on the lighting time of the red laser component in the driving cycle, and output the same signal as the green laser component based on the lighting time of the green laser component in the driving cycle.
  • the enable signal G_EN corresponding to the component outputs the enable signal B_EN corresponding to the blue laser component based on the lighting time of the blue laser component in the driving period. Based on the lighting duration of the yellow laser component in the driving period, the enable signal Y_EN corresponding to the yellow laser component is output.
  • the display control component 100 further includes a second memory 1003, and the second memory 1003 is used to store the primary color gradation values of the pixels in the image to be projected.
  • the display driving circuit 1001 is also used to obtain the stored primary color gradation value of the pixel in the image to be projected from the second memory 1003, and control the light valve to flip according to the primary color gradation value of the pixel in the image to be projected, so as to convert the image to be projected Project the display to the projection screen.
  • the slave control circuit 1002 is also used to monitor the ambient temperature inside the housing 10 and the temperature of the laser light source 120, and adjust the ambient temperature inside the housing 10 and the temperature of the laser light source 120 by controlling a fan.
  • some embodiments of the present disclosure provide a projection device in which a signal detector in the projection device detects whether there is a foreign object at an opening of a receiving slot in response to a shutdown instruction.
  • a fifth detection signal is sent to the control component.
  • the control component can stop providing the down driving signal to the screen driving component. Therefore, when there is a foreign object at the opening of the accommodating groove, the situation that the projection screen is blocked by the foreign object and cannot be lowered when the projection screen is lowered is avoided, thereby improving the reliability of the control of the projection screen falling.
  • the signal detector 20 is configured to detect whether there is a foreign object at the opening of the receiving slot 00 in response to a shutdown instruction, or when the falling distance of the projection screen 30 is greater than the third distance threshold, And when a foreign object is detected at the opening of the containing tank 00, a fifth detection signal is sent to the control assembly 50. When it is detected that there is no foreign matter at the opening of the containing tank 00, a sixth detection signal is sent to the control assembly 50.
  • control component 50 is also used to stop providing the down driving signal to the screen driving component 40 when the fifth detection signal is received.
  • a down driving signal is provided to the screen driving assembly 40.
  • the screen drive assembly 40 is connected to the projection screen 30, and the screen drive assembly 40 is used to control the projection screen 30 to retract into the receiving slot 00 under the control of the falling drive signal.
  • control assembly 50 is also used for controlling the projection screen 30 to retract the receiving slot 00, when the projection screen 00 falling distance is greater than the fourth distance threshold, increase the drop provided to the screen drive assembly 30 The frequency of the drive signal.
  • the fourth distance threshold is greater than the third distance threshold, and the moving speed of the projection screen is positively correlated with the frequency.
  • some embodiments of the present disclosure provide a projection device in which a signal detector in the projection device detects whether there is a foreign object at an opening of a receiving slot in response to a shutdown instruction.
  • a fifth detection signal is sent to the control component.
  • the control component stops providing the down driving signal to the screen driving component. Therefore, when there is a foreign object at the opening of the accommodating groove, the situation that the projection screen is blocked by the foreign object and cannot be lowered when the projection screen is lowered is avoided, thereby improving the reliability of the control of the projection screen falling.
  • Fig. 16 is a flowchart of a method for controlling the elevation of a projection screen according to some embodiments.
  • the lifting control method can be executed in the control assembly 50 located in the housing 10 of the projection device shown in any one of FIGS. 1 to 13.
  • the projection device further includes a signal detector 20, a projection screen 30, and a screen drive assembly 40 , One side of the housing 10 is provided with a receiving groove 00 for accommodating the projection screen 30.
  • the control assembly 50 is connected to the signal detector 20 and the screen drive assembly 40 respectively.
  • the method includes step 1601 to step 1602.
  • step 1601 when the first detection signal sent by the signal detector is received, stop providing the rising drive signal to the screen drive assembly.
  • step 1602 when the second detection signal sent by the signal detector is received, an upward driving signal is provided to the screen driving component.
  • the ascending drive signal is configured to control the screen drive assembly 40 to control the projection screen 30 to rise from the accommodating groove 00.
  • the signal detector 20 detects whether there is a foreign object at the opening of the accommodating slot 00 in response to the power-on instruction; when it detects that there is a foreign object at the opening of the accommodating slot 00, it sends a first detection signal to the control assembly 50, and when the When there is no foreign object at the opening, a second detection signal is sent to the control group 50.
  • some embodiments of the present disclosure provide a lifting control method for projection screens.
  • the signal detector in the lifting control method can detect whether there is a foreign object at the opening of the receiving slot in response to a power-on command, and When a foreign object is detected at the opening of the containing groove, a first detection signal is sent to the control component. After receiving the first detection signal, the control component stops providing the driving signal to the screen driving component. Therefore, when there is a foreign object at the opening of the accommodating groove, the situation that the projection screen is blocked by the foreign object and cannot rise when the projection screen rises is avoided, thereby improving the reliability of the control of the projection screen rise.
  • FIG. 17 is a flowchart of another method for controlling the elevation of a projection screen according to some embodiments. As shown in FIG. 17, the method may include steps 1701 to 1702.
  • Step 1701 When the fifth detection signal sent by the signal detector is received, stop providing the down driving signal to the screen driving assembly.
  • Step 1702 When the sixth detection signal sent by the signal detector is received, a down driving signal is provided to the screen driving assembly.
  • the descending drive signal is used to control the screen drive assembly 40 to control the projection screen 30 to retract into the receiving slot 00.
  • the fifth detection signal is that the signal detector 20 responds to the shutdown instruction, or when the falling distance of the projection screen 30 is greater than the third distance threshold, detects whether there is a foreign object at the opening of the containing slot 00, and when it detects that the containing slot 00 is When there is a foreign object in the opening, it is sent to the control component 50.
  • the sixth detection signal is a signal that the detector responds to the shutdown instruction, or when the descending distance of the projection screen 30 is greater than the third distance threshold, detects whether there is a foreign object at the opening of the accommodating slot 00, and when the opening of the accommodating slot 00 is detected When there is no foreign object, it is sent to the control component 50.
  • the embodiments of the present disclosure provide a method for controlling the elevation of a projection screen.
  • the elevation control method is in response to a shutdown command, or when the falling distance of the projection screen is greater than the third distance threshold, the opening of the receiving slot is detected Whether there is a foreign body in the place.
  • a fifth detection signal is sent to the control component.
  • the control component stops providing the down driving signal to the screen driving component. Therefore, when there is a foreign object at the opening of the accommodating groove, the situation that the projection screen is blocked by the foreign object and cannot be lowered when the projection screen is lowered is avoided, thereby improving the reliability of the control of the projection screen falling.
  • FIG. 18 is a flowchart of another method for controlling the elevation of a projection screen provided by some embodiments of the present disclosure. As shown in FIG. 18, the method may include steps 1801 to 1803.
  • Step 1801 When the fifth detection signal sent by the signal detector is received, stop providing the down driving signal to the screen driving assembly.
  • step 1802 when the sixth detection signal sent by the signal detector is received, a down driving signal is provided to the screen driving assembly.
  • Step 1803 When the falling distance of the projection screen is greater than the fourth distance threshold, increase the frequency of the falling drive signal provided to the screen drive assembly.
  • the descending drive signal is used to control the screen drive assembly 40 to control the projection screen 30 to retract into the receiving slot 00.
  • the fifth detection signal is that the signal detector 20 responds to the shutdown instruction, or when the falling distance of the projection screen 30 is greater than the third distance threshold, detects whether there is a foreign object at the opening of the containing slot 00, and when it detects that the containing slot 00 is When there is a foreign object in the opening, it is sent to the control component 50.
  • the sixth detection signal is that the signal detector 20 responds to the shutdown instruction, or when the descending distance of the projection screen 30 is greater than the third distance threshold, detects whether there is a foreign object at the opening of the accommodating slot 00, and when detecting the presence of the accommodating slot 00 When there is no foreign object at the opening, it is sent to the control component 50 that the fourth distance threshold is greater than the third distance threshold, and the moving speed of the projection screen 30 is positively correlated with the frequency.
  • some embodiments of the present disclosure provide a method for controlling the elevation of a projection screen.
  • the elevation control method responds to a shutdown instruction, or when the falling distance of the projection screen is greater than the third distance threshold, detecting the receiving slot Whether there is a foreign object at the opening of the accommodating slot, when a foreign object is detected at the opening of the containing groove, a fifth detection signal is sent to the control component. After receiving the fifth detection signal, the control component stops providing the down driving signal to the screen driving component. Therefore, when there is a foreign object at the opening of the accommodating groove, the situation that the projection screen is blocked by the foreign object and cannot be lowered when the projection screen is lowered is avoided, thereby improving the reliability of the control of the projection screen falling.
  • the moving speed of the projection screen is increased, thereby speeding up the retracting of the projection screen into the accommodating slot.

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Abstract

一种投影设备，包括：壳体（10）、信号检测器（20）、投影幕片（30）、幕片驱动组件（40）以及位于壳体（10）内的控制组件（50）。当信号检测器（20）检测到容纳槽（00）的开口处存在异物时，向控制组件（50）发送第一检测信号。当控制组件（50）接收到第一检测信号时，停止向幕片驱动组件（40）提供上升驱动信号。

Description

投影设备
相关申请的交叉引用
本公开要求在2020年06月11日提交中华人民共和国知识产权局、申请号为202010530890.2、发明名称为“投影设备”的中国专利申请的优先权，它们的全部内容通过引用结合在本公开中。
技术领域
本公开涉及激光投影显示领域，特别涉及一种投影设备。
背景技术
升降式激光投影设备中，投影幕片和主机可以为一体结构。该投影设备的主机上设置有容纳槽，该容纳槽内设置有幕片驱动组件，该幕片驱动组件与投影幕片连接，用于驱动投影幕片上升或下降。
发明内容
一方面，提供一种投影设备。所述激光投影设备包括壳体，信号检测器，投影幕片，幕片驱动组件，以及位于所述壳体内的控制组件。所述壳体的一侧设置有用于容纳所述投影幕片的容纳槽。所述信号检测器与所述控制组件连接，被配置为响应于开机指令，检测所述容纳槽的开口处是否存在异物，当检测到所述容纳槽的开口处存在异物时，向所述控制组件发送第一检测信号，当检测到所述容纳槽的开口处不存在异物时，向所述控制组件发送第二检测信号。所述控制组件还与所述幕片驱动组件连接，被配置为当接收到所述第一检测信号时，停止向所述幕片驱动组件提供上升驱动信号；当接收到所述第二检测信号时，向所述幕片驱动组件提供上升驱动信号。所述幕片驱动组与所述投影幕片连接，被配置为在所述上升驱动信号的控制下，控制所述投影幕片从所述容纳槽升出。
另一方面，提供了一种投影设备，所述投影设备包括：壳体，信号检测器，投影幕片，幕片驱动组件，以及位于所述壳体内的控制组件。所述壳体的一侧设置有用于容纳所述投影幕片的容纳槽。所述信号检测器与所述控制组件连接，被配置为响应于关机指令，或者在所述投影幕片的下降距离大于第三距离阈值时，检测所述容纳槽的开口处是否存在异物，当检测到所述容纳槽的开口处存在异物时，向所述控制组件发送第五检测信号时，当检测到所述容纳槽的开口处不存在异物时，向所述控制组件发送第六检测信号。所述控制组件还与所述幕片驱动组件连接，被配置为当接收到所述第五检测信号时，则停止向所述幕片驱动组件提供下降驱动信号，当接收到所述第六检测信号时，则向所述幕片驱动组 件提供下降驱动信号。所述幕片驱动组与所述投影幕片连接，被配置为在所述下降驱动信号的控制下，控制所述投影幕片收回所述容纳槽。
附图说明
为了更清楚地说明本公开实施例中的技术方案，下面将对本公开一些实施例中所需要使用的附图作简单地介绍。然而，下面描述中的附图仅仅是本公开一些实施例的附图，对于本领域普通技术人员来讲，还可以根据这些附图获得其他的附图。此外，以下描述中的附图可以视作示意图，并非对本公开实施例所涉及的产品的实际尺寸、方法的实际流程、信号的实际时序等的限制。
图1是根据一些实施例的一种投影设备的结构图；
图2是根据一些实施例的另一种投影设备的结构图；
图3是根据一些实施例的又一种投影设备的结构图；
图4是根据一些实施例的一种信号检测器的结构图；
图5是根据一些实施例提供的再一种投影设备的结构图；
图6是根据一些实施例的又一种投影设备的结构图；
图7是根据一些实施例的再一种投影设备的结构图；
图8是根据一些实施例的再一种投影设备的结构图；
图9是根据一些实施例的又一种投影设备的结构图；
图10是根据一些实施例的又一种投影设备的结构图；
图11是根据一些实施例的再一种投影设备的结构图；
图12是根据一些实施例的一种遮挡杆的结构图；
图13是根据一些实施例的又一种投影设备的结构图；
图14是根据一些实施例的一种脉冲信号序列的图；
图15是根据一些实施例的另一种脉冲信号序列的图；
图16是根据一些实施例的一种投影幕片的升降控制方法的流程图；
图17是根据一些实施例的另一种投影幕片的升降控制方法的流程图；
图18是根据一些实施例的再一种投影幕片的升降控制方法的流程图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合附图对本公开实施方式作进一步地详细描述。
除非上下文另有要求，否则，在整个说明书和权利要求书中，术语“包括(comprise)” 及其他形式例如第三人称单数形式“包括(comprises)”和现在分词形式“包括(comprising)”被解释为开放、包含的意思，即为“包含，但不限于”。在说明书的描述中，术语“一个实施例(one embodiment)”、“一些实施例(some embodiments)”、“示例性实施例(exemplary embodiments)”、“示例(example)”、“特定示例(specific example)”或“一些示例(some examples)”等旨在表明与该实施例或示例相关的特定特征、结构、材料或特性包括在本公开的至少一个实施例或示例中。上述术语的示意性表示不一定是指同一实施例或示例。此外，所述的特定特征、结构、材料或特点可以以任何适当方式包括在任何一个或多个实施例或示例中。
以下，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本公开实施例的描述中，除非另有说明，“多个”的含义是两个或两个以上。
在描述一些实施例时，可能使用了“连接”及其衍伸的表达。例如，描述一些实施例时可能使用了术语“连接”以表明两个或两个以上部件彼此间有直接物理接触或电接触。然而，术语“连接”也可能指两个或两个以上部件彼此间并无直接接触，但仍彼此协作或相互作用。这里所公开的实施例并不必然限制于本文内容。
本文中“被配置为”的使用意味着开放和包容性的语言，其不排除被配置为执行额外任务或步骤的设备。
另外，“基于”的使用意味着开放和包容性，因为“基于”一个或多个所述条件或值的过程、步骤、计算或其他动作在实践中可以基于额外条件或超出所述的值。
图1示出了根据一些实施例的一种投影设备的结构示意图。图2示出了根据一些实施例的另一种投影设备的结构示意图。如图1和图2所示，该投影设备可以包括壳体10，信号检测器20，投影幕片30，幕片驱动组件40，以及位于壳体10内的控制组件50。如图3所示，该壳体10的一侧设置有用于容纳投影幕片30的容纳槽00，该投影幕片30的一端可以固定在该容纳槽00内。
参考图2，该信号检测器20与控制组件50连接，该信号检测器20被配置为响应于开机指令，检测容纳槽00的开口处是否存在异物，以及当检测到容纳槽00的开口处存在异物时，向控制组件50发送第一检测信号。当检测到容纳槽00的开口处不存在异物时，向控制组件50发送第二检测信号。
在一些实施例中，控制组件50在接收到针对投影设备的开机指令后，可以启动信号检测器20，并可以将该开机指令发送至信号检测器20。该信号检测器20可以响应于该开机指令，检测容纳槽00的开口处是否存在异物。其中，异物是指能够遮挡容纳槽00的开 口的物体。例如该异物可以为水杯、玩具或者用户的手。
参考图2，该控制组件50与幕片驱动组件40连接，该控制组件50被配置于当接收到第一检测信号时，停止向幕片驱动组件40提供上升驱动信号；当接收到第二检测信号时，向幕片驱动组件40提供上升驱动信号。
参考图2，该幕片驱动组件40与投影幕片30连接，该幕片驱动组件40被配置为接收所述上升驱动信号的控制，控制投影幕片30从容纳槽00升出，或者收回容纳槽00。
在一些实施例中，如图2和图3，投影设备处于关闭状态时，该投影幕片30位于容纳槽00内。控制组件50在接收到针对投影设备的开机指令后，可以开启信号检测器20，并可以将该开机指令发送至信号检测器20。信号检测器20进而可以响应于该开机指令，检测容纳槽00的开口处是否存在异物，并当检测到容纳槽00的开口处存在异物时，向控制组件50发送第一检测信号。控制组件50在接收到该第一检测信号后，可以不向幕片驱动组件40提供上升驱动信号，从而避免出现投影幕片在上升的过程中被异物阻挡而无法上升的情况。
信号检测器20检测到容纳槽00的开口处不存在异物时，可以向控制组件50发送第二检测信号。控制组件50在接收到该第二检测信号后，即可向幕片驱动组件40提供上升驱动信号，幕片驱动组件40可以控制投影幕片30由图3所示的状态从容纳槽00上升为图1所示的状态。并且，控制组件50在接收到第二检测信号后，可以关闭信号检测器20。
综上所述，本公开的一些实施例提供了一种投影设备，该投影设备中的信号检测器能够响应于开机指令，检测容纳槽的开口处是否存在异物。当检测到容纳槽的开口处存在异物时，向控制组件发送第一检测信号。控制组件在接收到该第一检测信号后，可以停止向幕片驱动组件提供上升驱动信号。从而避免在容纳槽的开口处存在异物时，出现投影幕片上升时被异物阻挡无法上升的情况，由此提高了投影幕片上升控制的可靠性。
参考图4，信号检测器20可以包括信号发射器21和信号接收器22。信号发射器21用于发射检测信号，信号接收器22用于接收信号发射器21发射的检测信号。若信号接收器22未接收到信号发射器21发射的检测信号，则信号接收器22可以确定容纳槽00的开口处存在异物，并可以向控制组件50发送第一检测信号。若信号接收器22接收到信号发射器21发射的检测信号，则信号接收器22可以确定容纳槽00的开口处不存在异物，然后向控制组件50发送第二检测信号。
在一种可能的实施方式中，信号发射器21和信号接收器22相对设置在容纳槽00的两侧，其中，信号检测器20可以为投射式红外传感器或者投射式非红外传感器。
例如，参考图5，容纳槽00的开口可以为四边形，在一种可能的实施方式中，容纳 槽00的开口可以为矩形。信号发射器21和信号接收器22可以相对设置在该容纳槽00的开口的长边的两侧，信号发射器21沿容纳槽00的开口的长边的延伸方向发射检测信号。或者，信号发射器21和信号接收器22也可以相对设置在容纳槽00的开口的短边的两侧，信号发射器21沿容纳槽00的开口的短边的延伸方向发射检测信号。若信号接收器22接收到信号发射器21发送的检测信号，则信号接收器22可以确定容纳槽00的开口处不存在异物。若信号接收器22无法接收到信号发射器21发送的检测信号，则信号接收器22可以确定容纳槽00的开口处存在异物。
在一种可能的实施方式中，信号发射器21和信号接收器22均设置在容纳槽00的一侧。
例如，参考图5，信号发射器21和信号接收器22可以都设置在容纳槽00的开口的长边的一侧。或者信号发射器21和信号接收器22可以都设置在该容纳槽00的开口的短边的一侧。
假设信号发射器21和信号接收器22均设置在该容纳槽00的开口的短边的一侧，若信号接收器22接收到信号发射器21发送的检测信号，则信号接收器22可以确定容纳槽00的开口处存在异物，即信号发射器21发射的检测信号被异物反射后，信号接收器22接收到该检测信号。若信号接收器22未接收到信号发射器21发送的检测信号，信号接收器22可以确定容纳槽00的开口处不存在异物。
在一种可能的实施方式中，信号发射器21和信号接收器22均设置在容纳槽00内。如图1、图5、图6和图7，幕片驱动组件40可以包括横杆组件41，横杆组件41与投影幕片30连接。横杆组件41中具有透光区域01，信号发射器21在横杆组件41上的正投影，以及信号接收器22在横杆组件41上的正投影均位于横杆组件41的透光区域01。由此信号发射器21发射的检测信号能够透过横杆组件41，从而避免出现信号发射器21发射的检测信号被横杆组件41遮挡，从而导致信号接收器22无法接收到检测信号而出现误判的情况，确保了对异物检测的可靠性。其中，信号检测器20可以为发射式红外传感器或者反射式非红外传感器。
在一种可能的实施方式中，信号发射器21和信号接收器22中的一个设置在容纳槽00内，另一个设置在横杆组件41上。例如，信号发射器21可以设置在容纳槽00内，信号接收器22可以设置在横杆组件41上，横杆组件41中具有透光区域01，信号发射器21在横杆组件41上的正投影，以及信号接收器22在横杆组件41上的正投影均位于横杆组件41的透光区域01。
在一种可能的实施方式中，信号发射器21发射的检测信号可以透过横杆组件41。若 信号接收器22接收到信号发射器21发送的检测信号，则信号接收器22可以确定容纳槽00的开口处存在异物，即信号发射器21发射的检测信号透过横杆组件41后被异物反射，该反射后的检测信号再次经过横杆组件41被信号接收器22接收。
由此信号发射器21发射的检测信号能够透过横杆组件41，且被异物反射的检测信号也能够透过横杆组件41，从而避免出现信号发射器21发射的检测信号以及被异物反射的检测信号被横杆组件41遮挡，从而导致信号接收器22无法接收到检测信号而出现误判的情况，确保了对异物检测的可靠性。
如图7，幕片驱动组件40还可以包括幕片驱动电路42、电机43、升降杆44和升降杆驱动组件45。在一种可能的实施方式中，电机43也可以称为马达。
其中，幕片驱动电路42分别与控制组件50和电机43连接，幕片驱动电路42被配置为响应于上升驱动信号，向电机43提供第一驱动电流。
升降杆驱动组件45分别与电机43和升降杆44连接，电机43用于在该第一驱动电流的驱动下，驱动升降杆驱动组件45推动升降杆44上升。
升降杆44与横杆组件41连接，升降杆44用于在升降杆驱动组件45的推动下，推动横杆组件41上升，从而推动投影幕片30上升。
参考图8，幕片驱动组件40可以包括设置在容纳槽00内的导轨02，以及相对设置在容纳槽00两侧的两个驱动子组件，每个驱动子组件包括一个幕片驱动电路42、一个电机43、一个升降杆44、一个升降杆驱动组件45。每个升降杆驱动组件45包括滑块驱动子组件、滑块450和一个动力杆451。每个升降杆44可以包括第一杆体440，第二杆体441以及用于连接该两个杆体的弹性组件442。
其中，该每个驱动子组件中，电机43与对应的一个幕片驱动电路42连接。第一杆体440的一端与横杆组件41的一端连接，另一端通过一个弹性组件442与第二杆体441的一端连接，第二杆体441的另一端与导轨02连接。动力杆451的一端与滑块450连接，动力杆451的另一端与第二杆体441靠近该导轨02的一端的侧壁连接。
每个电机43在对应的幕片驱动电路42提供的第一驱动电流的驱动下，驱动每个滑块驱动子组件推动对应的滑块450沿导轨02朝靠近电机43的一侧滑动，以推动动力杆451朝靠近电机43的一侧移动。动力杆451进而可以通过第二杆体441推动第一杆体440上升，进而推动升降杆44上升。
如图9所示，该投影设备还可以包括位置检测器60，位置检测器60可以设置在容纳槽00内，且位置检测器60与控制组件50连接。位置检测器60用于响应于开机指令，检测投影幕片30是否处于顶端位置。当检测到投影幕片30处于顶端位置时，向控制组件50 发送第三检测信号，以及当检测投影幕片30未处于顶端位置时，向控制组件50第四检测信号。
控制组件50被配置为当接收到该第三检测信号时，可以确定投影幕片30当前处于顶端位置，进而可以停止向幕片驱动组件40提供上升驱动信号，并向幕片驱动组件40提供保持信号。当接收到第四检测信号时，则可以确定投影幕片30当前还未到达顶端位置，进而可以向幕片驱动组件40提供上升驱动信号。
幕片驱动组件40被配置为在保持驱动信号的控制下，控制投影幕片30处于顶端位置不变，以及在上升驱动信号的控制下，控制投影幕片30上升。
如图9所示，该投影设备还可以包括多媒体组件70，多媒体组件70可以包括音视频控制电路71，音视频控制电路71与控制组件50连接。投影设备的壳体10上可以设置有启动按钮，音视频控制电路71在检测到用户针对该开机按钮的点击操作时，可以生成开机指令，并可以将该开机指令发送至控制组件50。控制组件50在接收到该开机指令后，可以启动位置检测器60，同时将该开机指令发送至位置检测器60。位置检测器60进而可以响应于该开机指令，检测投影幕片30是否处于顶端位置。
在一种可能的实施方式中，该开机指令可以是用户通过遥控器触发的，音视频控制电路71在接收到遥控器发送的开机指令后，可以将该开机指令发送至控制组件50。控制组件50在接收到该开机指令后，可以启动位置检测器60，并可以将该开机指令发送至位置检测器60。位置检测器60可以响应于该开机指令，检测投影幕片30是否处于顶端位置。
在一种可能的实施方式中，多媒体组件70和控制组件50上可以设置有通信接口。多媒体组件70和控制组件50可以通过该通信接口连接，并根据串口通信协议传输开机指令。该通信接口可以为标准(recommeded standard，RS)232通讯接口。
在一实施例中，幕片驱动组件40在控制投影幕片30上升的过程中，位置检测器60可以实时检测投影幕片30是否处于顶端位置。在检测到投影幕片30仍未处于顶端位置时，可以继续向控制组件50发送第四检测信号。控制组件50继续向幕片驱动组件40发送上升驱动信号，进而控制投影幕片30上升。如此循环，直至位置检测器60在检测到投影幕片30处于顶端位置后，位置检测器60可以向控制组件50发送第三检测信号。控制组件50可以在接收到该第三检测信号后，停止向幕片驱动组件40发送上升驱动信号，并向幕片驱动组件40提供保持信号。幕片驱动组件40可以响应于该保持信号，控制投影幕片30处于顶端位置不变。
参考图10、图11、图12和图13，幕片驱动组件40还可以包括遮挡杆47，电机43包括转轴430，遮挡杆47设置在该转轴430上。电机43还用于在第一驱动电流的驱动下， 驱动遮挡杆47旋转。遮挡杆47和位置检测器60相对设置，且遮挡杆47旋转的过程中，会遮挡位置检测器60。
位置检测器60还被配置于响应于开机指令，统计遮挡杆431的旋转圈数m，并检测旋转圈数m是否小于或等于圈数阈值M，若旋转圈数m等于圈数阈值M，确定投影幕片30处于顶端位置。若旋转圈数m小于圈数阈值M，确定投影幕片30未处于顶端位置。其中，该圈数阈值M为位置检测器60中预先存储的固定数值。
在一种可能的实施方式中，位置检测器60可以包括发射器和接收器，该发射器用于发射光信号，该接收器用于接收发射器用于发射光信号。若发射器与接收器之间的光路未被遮挡，则接收器可以接收到发射器发射的光信号，此时接收器无法检测到脉冲信号。若发射器与接收器之间的光路被遮挡，则接收器无法接收到发射器发射的光信号，此时接收器可以检测到一个脉冲信号。
参考图11、图12和图13，遮挡杆47可以包括h个遮挡部470和连接杆471，连接杆471的一端套接在转轴430上，连接杆471的另一端与遮挡部470连接。在一种可能的实施方式中，图12示出了遮挡杆47包括三个遮挡部，分别为第一遮挡部4701和两个第二遮挡部4702。第一遮挡部4701位于连接杆471的一侧，且第一遮挡部4701的一端分别与两个第二遮挡部4702的一端连接。两个第二遮挡部4702位于连接杆471的另一侧，且两个第二遮挡部4702的一端也相互连接。其中，h为大于0的正整数。
在转轴430旋转一圈的过程中，位置检测器60可以检测到一个周期T的脉冲信号序列。且在一个周期T内，h个遮挡部470依次遮挡位置检测器60，则位置检测器60可以检测到h个脉冲信号。
在控制投影幕片30上升的过程中，幕片驱动电路42在控制组件50提供的上升驱动信号的控制下，向电机43提供第一驱动电流，电机43的转轴430在该第一驱动电流的驱动下，沿第一方向旋转，从而带动连接杆471沿第一方向旋转，进而带动遮挡部470沿第一方向旋转。其中，该第一方向可以为顺时针方向。
参考图12和图14，在转轴430沿第一方向旋转一圈的过程中，位置检测器60可以检测到一个周期T的脉冲信号序列。且在一个周期T内，若两个第二遮挡部4702依次遮挡位置检测器60，位置检测器60可以在t1时间段检测到时间间隔较短的两个脉冲信号。若第一遮挡部4701遮挡位置检测器60，该位置检测器60可以在t2时间段检测到一个脉冲信号。
在一些实施例中，假设在投影幕片30从初始位置移动至顶端位置的过程中，位置检测器60共检测到k个脉冲信号。由于在电机43中的转轴430每旋转一圈，位置检测器60 可以检测到一个周期T的脉冲信号序列。且在该一个周期T中，位置检测器60可以检测到h个脉冲信号。因此，位置检测器60可以统计出遮挡杆47的旋转圈数为m，该旋转圈数m满足：
Figure PCTCN2021099393-appb-000001
其中，k大于0的正整数。
电机43在启动的过程中，若启动频率过高或者负载过大，可能造成在旋转圈数m小于圈数阈值M。
假设电机43在启动过程中，其启动频率正常，且负载正常，则投影幕片30从初始位置移动至顶端位置的过程中，电机43需要转动N个步距角，若步距角为θ度。电机43转动一圈为360度，转动一圈需要转动n个步距角，则
Figure PCTCN2021099393-appb-000002
则投影幕片30从初始位置移动到顶端位置，电机43需要转动y圈，
Figure PCTCN2021099393-appb-000003
其中，N和θ均大于0。
由于电机43中的转轴430每旋转一圈，位置检测器60可以检测到一个周期T的脉冲信号序列。且在该一个周期T中，位置检测器60可以检测到h个脉冲信号。因此，电机43中的转轴430转动y圈，位置检测器60可以检测到h×y个脉冲信号。则根据投影幕片30从初始位置移动到顶端位置所检测到的脉冲信号的个数，以及每个周期T检测到的脉冲信号个数，可以确定圈数阈值M，该圈数阈值
Figure PCTCN2021099393-appb-000004
示例的，假设N＝480，步距角θ＝7.5°，电机43转动一圈需要转动
Figure PCTCN2021099393-appb-000005
个步距角，投影幕片30从初始位置移动到顶端位置，电机43需要转动
Figure PCTCN2021099393-appb-000006
则圈数阈值M＝y＝10。
在一种可能的实施方式中，控制组件50配置为在控制投影幕片30从容纳槽00升出的过程中，每隔检测周期，获取投影幕片30在该检测周期内的移动距离。并分别检测该移动距离是否大于第一距离阈值。若该移动距离大于第一距离阈值，表明投影幕片20的移动速度较快，则降低向幕片驱动组件40提供的上升驱动信号的频率，由此降低投影幕片30的移动速度。若该移动距离小于或等于第一距离阈值，则检测该移动距离是否小于第二距离阈值，若移动距离小于第二距离阈值，表明投影幕片30的移动速度较慢，则增大向幕片驱动组件40提供的上升驱动信号的频率，由此提高投影幕片30的移动速度。
其中，该第一距离阈值大于第二距离阈值，该投影幕片30的移动速度与频率正相关，也即是该上升驱动信号的频率越大，投影幕片30的移动速度越快；该上升驱动信号的频率越小，该投影幕片30的移动速度越慢。
在一些实施例中，在控制投影幕片30从容纳槽00升出的过程中，由于可以根据投影幕片30在检测周期内的移动距离动态调整投影幕片30的移动速度，因此提高了对投影幕片上升控制的灵活性。
参考图9，该投影设备还可以包括距离检测器80，距离检测器80设置在容纳槽00的 至少一侧。在一种可能的实施方式中，容纳槽00的开口的长边的任一侧设置距离传感器80。或者，参考图5，容纳槽00的开口的长边的两侧均设置有距离检测器80。可选的，距离检测器80可以为红外传感器或者非红外传感器。
距离检测器80与控制组件50连接，距离检测器80用于发射光信号，以及接收被横杆组件41反射的光信号。
控制组件50还被配置为根据距离检测器80发射光信号的发射时刻t3和接收被横杆组件41反射的光信号的接收时刻t4，确定投影幕片30在检测周期内的移动距离d。其中，该t3和t4均大于0。
在一种可能的实施方式中，控制组件50中预先存储有光信号的传输速度V。控制组件50每隔检测周期，获取距离检测器80发射光信号的发射时刻t3，以及距离检测器80接收到的被横杆组件41反射的该光信号的接收时刻t4。并根据该光信号的发射时刻t3和光信号的接收时刻t4，确定在该检测周期内该光信号的传输时长T1。该传输时长T1＝t4-t3。
之后，控制组件50可以根据预先存储有光信号的传输速度V和传输时长T1，确定投影幕片30在该检测周期内的移动距离d。移动距离d满足：
Figure PCTCN2021099393-appb-000007
在一些实施例中，参考图5，若该容纳槽00的开口的长边的两侧均设置有距离检测器80。则控制组件50可以根据两个距离检测器80，确定出两个移动距离。控制组件50可以将该两个移动距离的均值作为投影幕片30在检测周期内的移动距离。
参考图5和图8，容纳槽00的开口的长边的两侧均设置有距离检测器80。则两个电机43控制投影幕片30上升的过程中，控制组件50每隔检测周期根据两个距离检测器确定出两个移动距离。之后可以检测该两个移动距离的的差值是否大于差值阈值。若该差值大于差值阈值，表明投影幕片30两侧的移动距离的差异较大，继而调整向任一幕片驱动电路42提供的上升驱动信号的频率，从而确保投影幕片30两侧的移动距离的差值处于恒定范围内。若该差值小于或等于差值阈值，表明投影幕片30两侧的移动距离差异较小，则无需调整向两个幕片驱动电路42提供的上升驱动信号的频率。
在一种可能的实施方式中，假定在检测周期内，驱动投影幕片30的一侧移动距离较大的幕片驱动电路42为第一幕片驱动电路，驱动投影幕片30的另一侧移动距离较小的幕片驱动电路42为第二幕片驱动电路，控制组件50在调整向任一幕片驱动电路42提供的上升驱动信号的频率的过程中，可以降低向第一幕片驱动电路提供的上升驱动信号的频率，由此降低投影幕片30一侧的移动速度。或者控制组件50可以增大向第二幕片驱动电路提供的上升驱动信号的频率，由此增大投影幕片30另一侧的移动速度。
综上所述，本公开的一些实施例提供了一种投影设备，该投影设备中的信号检测器能够在检测到容纳槽的开口处存在异物时，向控制组件发送第一检测信号。控制组件在接收到该第一检测信号后，可以停止向幕片驱动组件提供上升驱动信号。从而避免在容纳槽的开口处存在异物时，出现投影幕片上升时被异物阻挡无法上升的情况，由此提高了投影幕片上升控制的可靠性。
在一些实施例中，参考图2，信号检测器20还用于响应于关机指令，或者在投影幕片30的下降距离大于第三距离阈值时，检测容纳槽00的开口处是否存在异物，以及当检测到容纳槽00的开口处存在异物时，向控制组件50发送第五检测信号。当检测到容纳槽00的开口处不存在异物时，向控制组件50发送第六检测信号。
在一些实施例中，控制组件50在接收到针对投影设备的关机指令后，可以启动信号检测器20，并将该关机指令发送至信号检测器20。该信号检测器20可以响应于该关机指令，检测容纳槽00的开口处是否存在异物。
或者，控制组件50在控制投影幕片30收回容纳槽00的过程中，可以实时获取投影幕片30的下降距离，并检测该下降距离是否大于第三距离阈值。若该下降距离大于第三距离阈值，确定投影幕片30下降至信号检测器20的检测范围内。控制组件50可以启动信号检测器20，信号检测器20可以检测容纳槽00的开口处是否存在异物。该第三距离阈值为控制组件50中预先存储的固定数值。
参考图2，该控制组件50还被配置为当接收到第五检测信号时，则停止向幕片驱动组件40提供下降驱动信号。当接收到第六检测信号时，则向幕片驱动组件40提供下降驱动信号。
参考图2，幕片驱动组件40与投影幕片30连接，幕片驱动组件40用于在该下降驱动信号的控制下，控制投影幕片30收回容纳槽00。
参考图1和图2，在投影设备处于开启状态时，投影幕片30处于打开状态。控制组件50在接收到针对投影设备的关机指令后，可以再次开启信号检测器20，信号检测器20进而可以检测容纳槽00的开口处是否存在异物，并在检测到容纳槽00的开口处存在异物时，向控制组件50发送第五检测信号。控制组件50在接收到该第五检测信号后，停止向幕片驱动组件40提供下降驱动信号，从而避免出现投影幕片在下降的过程中被异物阻挡而无法收回容纳槽00的情况。
信号检测器20检测到容纳槽00处不存在异物时，可以向控制组件50发送第六检测信号，控制组件50在接收到该第六检测信号后，向幕片驱动组件40提供下降驱动信号，从而控制投影幕片30由图1所示的状态收回容纳槽00。
综上所述，本公开的一些实施例提供了一种投影设备，该投影设备中的信号检测器能够响应于关机指令，或在投影幕片的下降距离大于第三距离阈值时，检测容纳槽的开口处是否存在异物。当检测到容纳槽的开口处存在异物时，向控制组件发送第五检测信号。控制组件在接收到该第五检测信号后，可以停止向幕片驱动组件提供下降驱动信号。从而避免在容纳槽的开口处存在异物时，出现投影幕片下降时被异物阻挡无法下降的情况，由此提高了投影幕片下降控制的可靠性。
参考图4，该信号检测器20包括信号发射器21和信号接收器22。信号发射器21和信号接收器22相对设置在容纳槽00的两侧。在其他可能的实施方式中，信号发射器21和信号接收器22均设置在容纳槽00的一侧；或者，信号发射器21和信号接收器22均设置在容纳槽00内。
或者，该信号发射器21和信号接收器22中的一个设置在容纳槽00内，另一个设置在横杆组件41上。
在一些实施方式中，信号发射器21发射的检测信号可以透过横杆组件41，若信号接收器22接收到信号发射器21发送的检测信号，则信号接收器22可以确定容纳槽00的开口处不存在异物。若信号接收器22无法接收到信号发射器21发送的检测信号，则信号接收器22可以确定容纳槽00的开口处存在异物。
参考图7，幕片驱动电路42还用于响应于下降驱动信号，向电机43提供第二驱动电流。电机43用于在该第二驱动电流的驱动下，驱动升降杆驱动组件45拉动升降杆44下降。升降杆44还用于在升降杆驱动组件45的拉动下，拉动横杆组件41下降，从而拉动投影幕片30下降。
参考图8，每个电机43在对应的幕片驱动电路42提供的第二驱动电流的驱动下，驱动每个滑块驱动子组件推动对应的滑块450沿导轨02朝远离电机43的一侧滑动，以推动动力杆451朝远离电机43的一侧移动。该动力杆451进而可以通过该第二杆体441拉动第一杆体440下降，进而拉动升降杆44下降。
参考图9，位置检测器60还用于响应于关机指令，检测投影幕片30是否处于初始位置，当检测到投影幕片30处于初始位置时，向控制组件50发送第七检测信号，以及当检测投影幕片30未处于初始位置时，向控制组件50发送第八检测信号。
控制组件50被配置为当接收到第七检测信号时，确定投影幕片30当前处于初始位置，则停止向幕片驱动组件40提供下降驱动信号。当接收到第八检测信号时，确定投影幕片30当前还未处于初始位置，则向幕片驱动组件40发送下降驱动信号。
幕片驱动组件40还被配置为在下降驱动信号的控制下，控制投影幕片30下降。
在一种可能的实施方式中，投影设备的壳体10上设置有关机按钮。参考图9，音视频控制电路71在检测到用户针对该关机按钮的点击操作时，生成关机指令，并将该关机指令发送至控制组件50。该控制组件50在接收到该关机指令后，启动位置检测器60，并将该关机指令发送至位置检测器60，该位置检测器60响应于该关机指令，检测投影幕片30是否处于初始位置。
在一种可能的实施方式中，该关机指令是用户通过遥控器触发的，该音视频控制电路71在接收到遥控器发送的关机指令后，将该关机指令发送至控制组件50。该控制组件50在接收到该关机指令后，启动位置检测器60，并将该关机指令发送至位置检测器60，该位置检测器60响应于该关机指令，检测投影幕片30是否处于初始位置。
在一些实施例中，幕片驱动组件40在控制投影幕片30下降的过程中，位置检测器60实时检测投影幕片30是否处于初始位置。若检测到投影幕片30仍未处于初始位置，则继续向控制组件50发送第八检测信号，控制组件50在接收到第八检测信号后，确定投影幕片30还未处于初始位置，则继续向幕片驱动组件40发送下降驱动信号，以控制投影幕片30下降。如此循环，直至位置检测器60在检测到投影幕片30处于初始位置后，向控制组件50发送第五检测信号，该控制组件50接收到第七检测信号后，停止向幕片驱动组件40提供下降驱动信号。
在一些实施例中，该位置检测器60还被配置为响应于关机指令，统计在固定周期内遮挡杆431的旋转圈数m，并检测该旋转圈数m是否小于或等于圈数阈值M。若该旋转圈数等于圈数阈值M，则确定投影幕片30处于初始位置。若该旋转圈数m小于圈数阈值M，则确定投影幕片30未处于初始位置。
在控制投影幕片30下降的过程中，幕片驱动电路42在控制组件50提供的下降驱动信号的控制下，向电机43提供第二驱动电流，电机43的转轴430在该第二驱动电流的驱动下，沿第二方向旋转，从而带动连接杆471沿第二方向旋转，进而带动遮挡部470沿第二方向旋转。其中，该第二方向可以为逆时针方向。
参考图12和图15，转轴430在沿第二方向旋转一圈的过程中，位置检测器60可以检测到一个周期T的脉冲信号序列。在该一个周期T内，若第一遮挡部4701遮挡位置检测器60，则位置检测器60在t5时间段检测到一个脉冲信号；若两个第二遮挡部4702依次遮挡位置检测器60，则位置检测器60在t6时间段依次检测到时间间隔较短的两个脉冲信号。
在一种可能的实施方式中，在控制投影幕片30从顶端位置移动至初始位置的情况下，圈数阈值M和旋转圈数m的计算方式，可以参考上述在控制投影幕片30从初始位置移动 至顶端位置的情况下，圈数阈值M和旋转圈数m的计算方式。
在一种可能的实施方式中，控制组件50还被配置为在控制投影幕片30收回容纳槽00的过程中，获取投影幕片30的下降距离。若该下降距离大于第四距离阈值，则关闭信号检测器20，并增大向幕片驱动组件40提供的下降驱动信号的频率。
其中，该下降距离指的是投影幕片30与横杆组件41连接的一侧与壳体10之间的距离。该第四距离阈值大于第三距离阈值，且该第四距离阈值为控制组件50中预先存储的固定数值。
在一些实施例中，控制组件50在控制投影幕片30收回容纳槽00的过程中，可以实时获取投影幕片30的下降距离，并检测该下降距离是否大于第四距离阈值时，确定投影幕片30与壳体10之间的距离较近，例如，该距离可以为30毫米(mm)，则控制组件50关闭信号检测器20的同时增大向幕片驱动组件40提供的下降驱动信号的频率，以使得投影幕片30快速收回容纳槽00。
在一种可能的实施方式中，控制组件50还被配置为在控制投影幕片30收回容纳槽00的过程中，每隔检测周期，获取投影幕片30在该检测周期内的移动距离。并分别检测该移动距离是否大于第一距离阈值。若该移动距离大于第一距离阈值，表明投影幕片20的移动速度较快，则降低向幕片驱动组件40提供的下降驱动信号的频率，由此降低投影幕片30的移动速度。若该移动距离小于或等于第一距离阈值，则检测该移动距离是否小于第二距离阈值，若移动距离小于第二距离阈值，表明投影幕片30的移动速度较慢，则增大向幕片驱动组件40提供的下降驱动信号的频率，由此提高投影幕片30的移动速度。
其中，该第一距离阈值大于第二距离阈值，该投影幕片30的移动速度与频率正相关，也即是该下降驱动信号的频率越大，投影幕片30的移动速度越快；该下降驱动信号的频率越小，该投影幕片30的移动速度越慢。
在一些实施例中，在控制投影幕片30收回容纳槽00的过程中，由于可以根据投影幕片30在检测周期内的移动距离动态调整投影幕片30的移动速度，因此提高了对投影幕片升降控制的灵活性。
参考图9，在控制投影幕片30收回容纳槽00的过程中，控制组件50可以根据距离检测器80发射光信号的发射时刻t3和接收被横杆组件41反射的光信号的接收时刻t4，确定投影幕片30在检测周期内的移动距离d。
在一种可能的实施方式中，参考图5，若该容纳槽00的开口的长边的两侧均设置有距离检测器80。则在控制投影幕片30收回容纳槽00的过程中，控制组件50可以根据两个距离检测器80，确定出两个移动距离。控制组件50可以将该两个移动距离的均值作为投 影幕片30在检测周期内的移动距离。
在一种可能的实施方式中，控制组件50也可以根据该距离检测器80确定投影幕片30的下降距离，其中，光信号的发射时刻为控制组件50向幕片驱动组件40提供下降驱动信号的时刻。
同时，若该容纳槽00的开口的长边的两侧均设置有距离检测器80。则控制组件50可以根据两个距离检测器80，确定出两个下降距离。控制组件50可以将该两个下降距离的均值作为投影幕片30的下降距离。
参考图5和图8，容纳槽00的开口的长边的两侧均设置有距离检测器80。则在通过两个电机43控制投影幕片30下降的过程中，控制组件50在每隔检测周期，根据两个距离检测器，确定出两个移动距离之后。可以检测该两个移动距离的的差值是否大于差值阈值。若该差值大于差值阈值，表明投影幕片30两侧的移动距离的差异较大，因此可以调整向任一幕片驱动电路42提供的下降驱动信号的频率，从而确保投影幕片30两侧的移动距离的差值处于恒定范围内。若该差值小于或等于差值阈值，表明投影幕片30两侧的移动距离差异较小，则无需调整向两个幕片驱动电路42提供的下降驱动信号的频率。
在一种可能的实施方式中，控制组件50在调整向任一幕片驱动电路42提供的下降驱动信号的频率的过程中，可以降低向一个幕片驱动电路42提供的下降驱动信号的频率，由此降低投影幕片30一侧的移动速度。或者控制组件50可以增大向另一个幕片驱动电路42提供的下降驱动信号的频率，由此增大投影幕片30另一侧的移动速度。
参考图9，多媒体组件70包括功放组件72和扬声器73，该功放组件72分别与音视频控制电路71和扬声器74连接。控制组件50在接收到信号检测器20发送的第一检测信号后，向音视频控制电路71发送报警信息，该音视频控制电路71在接收到该报警信息后，将该报警信息发送至功放组件72，该功放组件72驱动扬声器74发出报警声音，从而提示用户及时移走异物。
参考图5和图9，该投影设备还可以包括护眼组件90和显示控制组件100，该护眼组件90设置在壳体10的前侧。该护眼组件90包括人眼保护传感器91、放大电路92、比较电路93和触发器94。该显示控制组件100包括显示驱动电路1001和从控电路1002。其中，该从控电路1002可以为微控制器(micro controller unit，MCU)。
其中，该放大电路92分别与人眼保护传感器91和比较电路93连接，该触发器94分别与比较电路93和从控电路1002连接。该从控电路1002与音视频控制电路71连接。该人眼保护传感器90可以为红外传感器或者非红外传感器。
在控制投影幕片30上升之前，或者控制投影幕片30下降的过程中，该人眼保护传感 器91用于检测人体与投影设备之间的距离，并将检测到的距离发送至放大电路92和比较电路93，该比较电路93用于将该距离与预先存储的距离阈值进行比较，若该距离阈值小于距离阈值，则向触发器94提供控制信号。从控电路1002在检测到触发器94在单位时间内输出的脉冲信号的个数大于个数阈值时，可以确定人体距离投影设备的距离较近，即人阻挡投影幕片的上升或下降的可能性。则从控电路1002可以向音视频控制电路71发送报警信息，音视频控制电路71可以将接收到的报警信息，可以将该报警信息发送至功放组件72，该功放组件72驱动扬声器74发出报警声音，以提醒用户远离投影幕片30。
参考图9，该投影设备还包括光源驱动组件110和激光光源120。该激光光源120用于发射激光。该激光光源120包括红色激光器、绿色激光器组件、蓝色激光器组件和黄色激光器组件。该每个激光器的出光侧设置有具备合光功能的玻璃镜片。
该多媒体组件70还包括第一存储器73。第一存储器73与音视频控制电路71连接。第一存储器73用于存储待投影显示的图像。音视频控制电路71还用于从第一存储器73获取待投影显示的图像，并将待投影显示的图像发送至从控电路1002，进而发送给显示驱动电路1001。显示驱动电路1001基于待显示图像的红色基色分量输出与红色激光器组件对应的红色PWM信号R_PWM，基于待显示图像的绿色基色分量输出与绿色激光器组件对应的绿色PWM信号G_PWM，基于待显示图像的蓝色基色分量输出与蓝色激光器组件对应的蓝色PWM信号B_PWM，基于待显示图像的黄色基色分量输出与黄色激光器组件对应的黄色PWM信号Y_PWM。并且，该显示驱动电路1001可以基于红色激光器组件在驱动周期内的点亮时长，输出与红色激光器组件对应的使能信号R_EN，基于绿色激光器组件在驱动周期内的点亮时长，输出与绿色激光器组件对应的使能信号G_EN，基于蓝色激光器组件在驱动周期内的点亮时长，输出与蓝色激光器组件对应的使能信号B_EN。基于黄色激光器组件在驱动周期内的点亮时长，输出与黄色激光器组件对应的使能信号Y_EN。
参考图9，显示控制组件100还包括第二存储器1003，第二存储器1003用于存储待投影图像中像素的基色色阶值。显示驱动电路1001还用于从第二存储器1003中获取存储的待投影图像中像素的基色色阶值，并根据待投影图像中像素的基色色阶值控制光阀进行翻转，以将待投影图像投影显示至投影幕片。
在一些实施例中，从控电路1002还用于监测壳体10内部的环境温度、激光光源120的温度，并通过控制风扇，来调节壳体10内部的环境温度和激光光源120的温度。
综上所述，本公开的一些实施例提供了一种投影设备，该投影设备中的信号检测器响应于关机指令，检测容纳槽的开口处是否存在异物。当检测到容纳槽的开口处存在异物时， 向控制组件发送第五检测信号。控制组件在接收到该第五检测信号后，可以停止向幕片驱动组件提供下降驱动信号。从而避免在容纳槽的开口处存在异物时，出现投影幕片下降时被异物阻挡无法下降的情况，由此提高了投影幕片下降控制的可靠性。同时，可以避免出现投影幕片在下降的过程用户的手放在容纳槽的开口处而被夹的情况，确保了用户的安全性。
在一些实施例中，参考图2，信号检测器20被配置为于响应于关机指令，或者在投影幕片30的下降距离大于第三距离阈值时，检测容纳槽00的开口处是否存在异物，以及当检测到容纳槽00的开口处存在异物时，向控制组件50发送第五检测信号。当检测到容纳槽00的开口处不存在异物时，向控制组件50发送第六检测信号。
参考图2，控制组件50还用于当接收到第五检测信号时，则停止向幕片驱动组件40提供下降驱动信号。当接收到第六检测信号时，则向幕片驱动组件40提供下降驱动信号。
参考图2，幕片驱动组件40与投影幕片30连接，幕片驱动组件40用于在该下降驱动信号的控制下，控制投影幕片30收回容纳槽00。
参考图2，控制组件50还用于在控制投影幕片30收回容纳槽00的过程中，当投影幕片00的下降距离大于第四距离阈值时，增大向幕片驱动组件30提供的下降驱动信号的频率。
其中，该第四距离阈值大于第三距离阈值，该投影幕片的移动速度与频率正相关。
综上所述，本公开的一些实施例提供了一种投影设备，该投影设备中的信号检测器响应于关机指令，检测容纳槽的开口处是否存在异物。当检测到容纳槽的开口处存在异物时，向控制组件发送第五检测信号。控制组件在接收到该第五检测信号后，停止向幕片驱动组件提供下降驱动信号。从而避免在容纳槽的开口处存在异物时，出现投影幕片下降时被异物阻挡无法下降的情况，由此提高了投影幕片下降控制的可靠性。同时，可以避免出现投影幕片在下降的过程用户的手放在容纳槽的开口处而被夹的情况，确保了用户的安全性。同时，由于在投影幕片的下降距离大于第四距离阈值时，增大投影幕片的移动速度，从而可以加快投影幕片收回容纳槽。
图16是一些实施例的一种投影幕片的升降控制方法的流程图。该升降控制方法可以在图1至图13任一所示的位于投影设备的壳体10内的控制组件50内执行，投影设备还包括信号检测器20，投影幕片30，幕片驱动组件40，壳体10的一侧设置有用于容纳投影幕片30的容纳槽00。控制组件50分别与信号检测器20和幕片驱动组件40连接。如图16所示，该方法包括步骤1601至步骤1602。
步骤1601，当接收到信号检测器发送的第一检测信号时，则停止向幕片驱动组件提供 上升驱动信号。
步骤1602，当接收到信号检测器发送的第二检测信号时，则向幕片驱动组件提供上升驱动信号。
其中，上升驱动信号被配置为控制幕片驱动组件40控制投影幕片30从容纳槽00升出。信号检测器20响应于开机指令，检测容纳槽00的开口处是否存在异物；当检测到容纳槽00的开口处存在异物时，向控制组件50发送第一检测信号，当检测到容纳槽00的开口处未存在异物时，向控制组50发送第二检测信号。
综上所述，本公开的一些实施例提供了一种投影幕片的升降控制方法，该升降控制方法中的信号检测器能够响应于开机指令，检测容纳槽的开口处是否存在异物，并在检测到容纳槽的开口处存在异物时，向控制组件发送第一检测信号。控制组件在接收到该第一检测信号后，停止向幕片驱动组件提供驱动信号。从而避免在容纳槽的开口处存在异物时，出现投影幕片上升时被异物阻挡无法上升的情况，由此提高了对投影幕片上升控制的可靠性。
图17是根据一些实施例的另一种投影幕片的升降控制方法的流程图，如图17所示，该方法可以包括步骤1701至步骤1702。
步骤1701，当接收到信号检测器发送的第五检测信号时，则停止向幕片驱动组件提供下降驱动信号。
步骤1702，当接收到信号检测器发送的第六检测信号时，则向幕片驱动组件提供下降驱动信号。
其中，下降驱动信号用于控制幕片驱动组件40控制投影幕片30收回容纳槽00。该第五检测信号是信号检测器20响应于关机指令，或者在投影幕片30的下降距离大于第三距离阈值时，检测容纳槽00的开口处是否存在异物，并当检测到容纳槽00的开口处存在异物时，向控制组件50发送的。该第六检测信号是信号检测器响应于关机指令，或者在投影幕片30的下降距离大于第三距离阈值时，检测容纳槽00的开口处是否存在异物，并当检测到容纳槽00的开口处不存在异物时，向控制组件50发送的。
综上所述，本公开实施例提供了一种投影幕片的升降控制方法，该升降控制方法响应于关机指令，或者在投影幕片的下降距离大于第三距离阈值时，检测容纳槽的开口处是否存在异物。当检测到容纳槽的开口处存在异物时，向控制组件发送第五检测信号。控制组件在接收到该第五检测信号后，停止向幕片驱动组件提供下降驱动信号。从而避免在容纳槽的开口处存在异物时，出现投影幕片下降时被异物阻挡无法下降的情况，由此提高了投影幕片下降控制的可靠性。同时，可以避免出现投影幕片在下降的过程用户的手放在容纳 槽的开口处而被夹的情况，确保了用户的安全性。
图18是本公开的一些实施例提供的再一种投影幕片的升降控制方法的流程图，如图18所示，该方法可以包括步骤1801至步骤1803。
步骤1801，当接收到信号检测器发送的第五检测信号时，则停止向幕片驱动组件提供下降驱动信号。
步骤1802，当接收到信号检测器发送的第六检测信号时，则向幕片驱动组件提供下降驱动信号。
步骤1803，当投影幕片的下降距离大于第四距离阈值时，增大向幕片驱动组件提供的下降驱动信号的频率。
其中，下降驱动信号用于控制幕片驱动组件40控制投影幕片30收回容纳槽00。该第五检测信号是信号检测器20响应于关机指令，或者在投影幕片30的下降距离大于第三距离阈值时，检测容纳槽00的开口处是否存在异物，并当检测到容纳槽00的开口处存在异物时，向控制组件50发送的。该第六检测信号是信号检测器20响应于关机指令，或者在投影幕片30的下降距离大于第三距离阈值时，检测容纳槽00的开口处是否存在异物，并当检测到容纳槽00的开口处不存在异物时，向控制组件50发送的，该第四距离阈值大于第三距离阈值，投影幕片30的移动速度与频率正相关。
综上所述，本公开的一些实施例提供了一种投影幕片的升降控制方法，该升降控制方法响应于关机指令，或者在投影幕片的下降距离大于第三距离阈值时，检测容纳槽的开口处是否存在异物，当检测到容纳槽的开口处存在异物时，向控制组件发送第五检测信号。控制组件在接收到该第五检测信号后，停止向幕片驱动组件提供下降驱动信号。从而避免在容纳槽的开口处存在异物时，出现投影幕片下降时被异物阻挡无法下降的情况，由此提高了投影幕片下降控制的可靠性。同时，可以避免出现投影幕片在下降的过程用户的手放在容纳槽的开口处而被夹的情况，确保了用户的安全性。且由于在投影幕片的下降距离大于第四距离阈值时，增大投影幕片的移动速度，从而可以加快投影幕片收回容纳槽。
以上所述仅为本公开的示例性实施例，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (12)

  1. 一种投影设备，包括：
    壳体，信号检测器，投影幕片，幕片驱动组件，以及位于所述壳体内的控制组件；
    所述壳体的一侧设置有用于容纳所述投影幕片的容纳槽；
    所述信号检测器与所述控制组件连接，被配置为响应于开机指令，检测所述容纳槽的开口处是否存在异物，当检测到所述容纳槽的开口处存在异物时，向所述控制组件发送第一检测信号，当检测到所述容纳槽的开口处不存在异物时，向所述控制组件发送第二检测信号；
    所述控制组件还与所述幕片驱动组件连接，被配置为当接收到所述第一检测信号时，停止向所述幕片驱动组件提供上升驱动信号，当接收到所述第二检测信号时，向所述幕片驱动组件提供上升驱动信号；
    所述幕片驱动组件与所述投影幕片连接，被配置为在所述上升驱动信号的控制下，控制所述投影幕片从所述容纳槽升出。
  2. 根据权利要求1所述的投影设备，其中，
    所述信号检测器包括信号发射器和信号接收器；所述信号发射器和所述信号接收器的位置满足所述信号发射器和所述信号接收器相对设置在所述容纳槽的两侧、所述信号发射器和所述信号接收器均设置在所述容纳槽的一侧、所述信号发射器和所述信号接收器均设置在所述容纳槽内中的任意一个要求；
    所述幕片驱动组件包括横杆组件，所述信号发射器和所述信号接收器均设置在所述横杆组件上；
    所述幕片驱动组件包括横杆组件，所述信号发射器和所述信号接收器中的一个设置在所述容纳槽内，另一个设置在所述横杆组件上。
  3. 根据权利要求1所述的投影设备，其中，
    所述幕片驱动组件包括幕片驱动电路、电机、升降杆、升降杆驱动组件和横杆组件；
    所述幕片驱动电路分别与所述控制组件和所述电机连接，所述幕片驱动电路被配置为响应于所述上升驱动信号，向所述电机提供第一驱动电流；
    所述升降杆驱动组件分别与所述电机和所述升降杆连接，所述电机被配置为在所述第一驱动电流的驱动下，驱动所述升降杆驱动组件推动所述升降杆上升；
    所述升降杆与所述横杆组件连接，所述横杆组件与所述投影幕片连接。
  4. 根据权利要求1所述的投影设备，其中，所述控制组件还被配置为：
    当接收到所述第二检测信号时，关闭所述信号检测器。
  5. 根据权利要求1所述的投影设备，其中，所述控制组件还被配置为：
    在控制所述投影幕片从所述容纳槽升出的过程中，每隔检测周期，获取所述投影幕片在所述检测周期内的移动距离；
    若所述移动距离大于第一距离阈值，降低向所述幕片驱动组件提供的所述上升驱动信号的频率；
    若所述移动距离小于第二距离阈值，增大向所述幕片驱动组件提供的所述上升驱动信号的频率；
    其中，所述第一距离阈值大于所述第二距离阈值，所述投影幕片的移动速度与所述频率正相关。
  6. 一种投影设备，包括：壳体，信号检测器，投影幕片，幕片驱动组件，以及位于所述壳体内的控制组件；
    所述壳体的一侧设置有用于容纳所述投影幕片的容纳槽；
    所述信号检测器与所述控制组件连接，被配置为响应于关机指令，或者在所述投影幕片的下降距离大于第三距离阈值时，检测所述容纳槽的开口处是否存在异物，当检测到所述容纳槽的开口处存在异物时，向所述控制组件发送第五检测信号，当检测到所述容纳槽的开口处不存在异物时，向所述控制组件发送第六检测信号；
    所述控制组件还与所述幕片驱动组件连接，被配置为当接收到所述第五检测信号时，则停止向所述幕片驱动组件提供下降驱动信号，当接收到所述第六检测信号，则向所述幕片驱动组件提供下降驱动信号；
    所述幕片驱动组与所述投影幕片连接，被配置为在所述下降驱动信号的控制下，控制所述投影幕片收回所述容纳槽。
  7. 根据权利要求6所述的投影设备，其中，所述信号检测器包括信号发射器和信号接收器；
    所述信号发射器和所述信号接收器满足所述信号发射器和所述信号接收器相对设置在所述容纳槽的两侧、所述信号发射器和所述信号接收器均设置在所述容纳槽的一侧、所述信号发射器和所述信号接收器均设置在所述容纳槽内、所述幕片驱动组件包括横杆组件，所述信号发射器和所述信号接收器均设置在所述横杆组件上、所述幕片驱动组件包括横杆组件，所述信号发射器和所述信号接收器中的一个设置在所述容纳槽内，另一个设置在所 述横杆组件上中的任一要求。
  8. 根据权利要求6所述的投影设备，其中，所述幕片驱动组件包括幕片驱动电路、电机、升降杆、升降杆驱动组件和横杆组件；
    所述幕片驱动电路分别与所述控制组件和所述电机连接，所述幕片驱动电路被配置为响应于所述下降驱动信号，向所述电机提供第二驱动电流；
    所述升降杆驱动组件分别与所述电机和所述升降杆连接，所述电机被配置为在所述第二驱动电流的驱动下，驱动所述升降杆驱动组件拉动所述升降杆下降；
    所述升降杆与所述横杆组件连接，所述横杆组件与所述投影幕片连接。
  9. 根据权利要求6所述的投影设备，其中，所述控制组件，还被配置为：
    当所述投影幕片的下降距离大于第四距离阈值时，关闭所述信号检测器，并增大向所述幕片驱动组件提供的所述下降驱动信号的频率；
    其中，所述第四距离阈值大于所述第三距离阈值，所述投影幕片的移动速度与所述频率正相关。
  10. 根据权利要求6所述的投影设备，其中，所述控制组件还被配置为：
    在控制所述投影幕片从收回所述容纳槽的过程中，每隔检测周期，获取所述投影幕片在所述检测周期内的移动距离；
    若所述移动距离大于第一距离阈值，降低向所述幕片驱动组件提供的所述下降驱动信号的频率；
    若所述移动距离小于第二距离阈值，增大向所述幕片驱动组件提供的所述下降驱动信号的频率；
    其中，所述第一距离阈值大于所述第二距离阈值，所述投影幕片的移动速度与所述频率正相关。
  11. 根据权利要10所述的投影设备，其中，所述投影设备还包括距离检测器，所述距离检测器设置在所述容纳槽的至少一侧；所述幕片驱动组件包括横杆组件，所述横杆组件与所述投影幕片连接；
    所述距离检测器与所述控制组件连接，所述距离检测器被配置为发射光信号，以及接收被横杆组件反射的所述光信号；
    所述控制组件还被配置为根据所述距离检测器发射所述光信号的发射时刻和接收被所述横杆组件反射的所述光信号的接收时刻，确定所述投影幕片在所述检测周期内的移动 距离。
  12. 根据权利要求6所述的投影设备，所述控制组件还被配置为当所述投影幕片的下降距离大于第四距离阈值时，增大向所述幕片驱动组件提供的所述下降驱动信号的频率；
    其中，所述第四距离阈值大于所述第三距离阈值，所述投影幕片的移动速度与所述频率正相关。
PCT/CN2021/099393 2020-06-11 2021-06-10 投影设备 WO2021249482A1 (zh)

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