Projection device

Abstract

A projection device includes a housing, a projection system, a drive module, a sensing module, and a control unit. The sensing module includes a sensing unit disposed at at least one of the periphery of the opening of the housing and the periphery of the cover facing the opening. The sensing module generates a first sensing signal based on parameter changes caused by an external object contacting the sensing unit. The control unit receives the first sensing signal and generates a control signal. The control signal controls the drive module to stop driving the cover to a closed state or to start driving the cover to an open state. This application uses a contact sensor of the sensing unit to promptly sense the user's fingers around the opening or cover, preventing the projector cover from pinching objects or people when closed, thus improving safety.

Description

Technical Field

[0001] This application relates to a projection device, and more particularly to an anti-pinch projection device that can promptly sense the state of the opening or the area around the cover to prevent the projector cover from pinching and injuring the user. Background Technology

[0002] Existing ultra-short throw projectors can project a large image onto a wall at a relatively short distance. For dust prevention or aesthetic purposes, an automatic cover is usually installed on the projection opening on the housing for the projection beam to pass through. When the projector enters a state of no use, such as when it is turned off or in standby mode, the cover is driven by a drive device to close the projection opening, thereby achieving the purpose of dust prevention and aesthetics.

[0003] However, during the process of the drive device closing the projection opening, if the user is not careful and external objects such as the user's own fingers or other items do not leave the area around the projection opening in time, the external objects may be accidentally pinched. In view of this, it is necessary to improve the anti-pinch function of the projector cover to prevent external objects from pinching or damaging the projection device mechanism, thus affecting the user experience.

[0004] The "Background Art" paragraph is only used to help understand the content of this utility model. Therefore, the content disclosed in the "Background Art" paragraph may include some prior art that does not constitute conventional art known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problem to be solved by one or more embodiments of this utility model was known or recognized by those skilled in the art prior to this application. Utility Model Content

[0005] This application provides a projection device that uses a contact sensor to detect the user's fingers around the opening or cover in a timely manner, preventing the projector cover from continuing to close when it pinches an object or a person, thereby avoiding damage to the object or injury to the person and improving the safety of use.

[0006] Other objects and advantages of this utility model can be further understood from the technical features disclosed in this application.

[0007] To achieve some or all of the above-mentioned objectives or other objectives, one embodiment of this utility model provides a projection device, including a housing, a projection system, a driving module, a sensing module, and a control unit. The housing includes a body and a cover, the cover being connected to the body and adapted to move relative to the body. The body has an accommodating space and an opening, the accommodating space communicating with the opening. The projection system is disposed within the accommodating space to provide a projection beam. The driving module is connected to the cover and drives the cover to switch between a closed state and an open state. When the cover is in the closed state, the cover covers the opening; when the cover is in the open state, the cover does not cover the opening. The system includes a mouth, the opening of which is adapted to allow the projection beam projected by the projection system to pass through; a sensing module, including a sensing unit disposed on at least one of the periphery of the opening on the body and the periphery of the cover facing the opening, the sensing module generating a first sensing signal based on parameter changes caused by an external object contacting the sensing unit; and a control unit electrically connected to the sensing module and the driving module, receiving the first sensing signal and generating a control signal based on the first sensing signal; the control signal being used to control the driving module to stop driving the cover to the closed state or to start driving the cover to the open state.

[0008] Based on the above, the embodiments of this utility model have at least one of the following advantages or effects. The projection device of this utility model, by providing a sensing unit on the opening or cover, wherein the sensing unit is a contact sensor, can promptly sense the user's fingers around the opening, preventing the projector cover from continuing to close when it pinches an object or person, thereby avoiding damage to objects or injury to the user and improving safety. Attached Figure Description

[0009] Figure 1A This is a three-dimensional schematic diagram of the appearance of the cover of the projection device of this utility model in the open state;

[0010] Figure 1B This is a three-dimensional schematic diagram of the appearance of the cover of the projection device of this utility model in the closed state;

[0011] Figure 2 This is a block diagram of the projection device of this utility model;

[0012] Figure 3 This is another block diagram of the projection device of this utility model;

[0013] Figure 4 This is a schematic diagram of the surface of the cover of this utility model facing the opening;

[0014] Figure 5This is a top view schematic diagram of one arrangement of the sensing unit at the opening in the projection device of this utility model;

[0015] Figure 6 This is a top view schematic diagram of another arrangement of the sensing unit at the opening in the projection device of this utility model;

[0016] Figure 7 This is a top view schematic diagram of another arrangement of the sensing unit at the opening in the projection device of this utility model;

[0017] Figure 8 This is a schematic diagram of the projection device and a partial enlargement of the present invention;

[0018] Figure 9 This is a schematic diagram of one arrangement of the sensing unit of the projection device of this utility model relative to the fitting slot;

[0019] Figure 10 This is a schematic diagram of another arrangement of the sensing unit of the projection device of this utility model relative to the fitting slot;

[0020] Figure 11 This is a schematic diagram illustrating another arrangement of the sensing unit relative to the fitting slot in the projection device of this utility model;

[0021] Figure 12 This is a partial enlarged schematic diagram of the flip-top projection device of this utility model;

[0022] Figure 13 This is a schematic diagram of the sliding cover projection device of this utility model;

[0023] Figure 14 This is a circuit block diagram of the projection device according to the first embodiment of the present invention;

[0024] Figure 15 This is a circuit block diagram of the projection device according to the second embodiment of the present invention;

[0025] Figure 16 This is a circuit block diagram of the projection device according to the third embodiment of the present invention;

[0026] Figure 17 This is a circuit block diagram of the projection device according to the fourth embodiment of this utility model;

[0027] Figure 18 This is a circuit block diagram of the projection device according to the fifth embodiment of this utility model.

[0028] Figure 19 This is a circuit block diagram of the sixth embodiment of the projection device of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1: Projection device;

[0031] 10: Shell; 101: Body; 102: Cover; Surface: 1011; 1021: Short side; 1022: Short side; 1023: Long side; 1024: Long side; 104: Accommodation space; 106: Opening;

[0032] 1061: Short side; 1062: Short side; 1063: Long side; 1064: Long side; 1066: Fitting groove;

[0033] 20: Projection system;

[0034] 30: Drive module; 32: Motor drive unit; 34: Motor;

[0035] 40: Sensing module;

[0036] 42: Sensing unit; 421: First conductor; 422: Second conductor; 423: Voltage source;

[0037] 44: Signal processing unit; 441: Ground pin; 442: Potential change pin; 443: Output pin;

[0038] 50: Control unit; 51: Grounding pin; 52: Potential change pin;

[0039] 60: Transmission module; 62: Cover connection structure; 64: Rotating shaft; 66: Motor connecting shaft;

[0040] 80: Input interface;

[0041] D1: Horizontal direction; T: Predetermined trajectory Detailed Implementation

[0042] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the scope of this utility model.

[0043] Please see Figure 1A , Figure 1B and Figure 2 , Figure 1A This is a three-dimensional schematic diagram of the appearance of the cover of the projection device of this utility model in the open state. Figure 1BThis is a perspective view of the projection device's cover in the closed state. The projection device 1 includes a housing 10, a projection system 20, a drive module 30, a sensing module 40, and a control unit 50. The control unit 50 is electrically connected to the drive module 30 and the sensing module 40, and in some embodiments, it is further electrically connected to the projection system 20. The housing 10 includes a body 101 and a cover 102. The cover 102 is connected to the body 101 and is adapted to move relative to the body 101. The body 101 has an accommodating space 104 and an opening 106. The accommodating space 104 communicates with the opening 106, and the projection system 20, drive module 30, sensing module 40, and control unit 50 are at least partially disposed within the accommodating space 104. The projection system 20 provides a projection beam. The drive module 30 is connected to the cover 102 and drives the cover 102 to switch between a closed state and an open state. Figure 1A As shown, when the cover 102 is in the open state, the cover 102 does not cover the opening 106, and the opening 106 is adapted to allow the projection beam projected by the projection system 20 to pass through, so that the projection beam projected by the projection system 20 leaves the projection device 1 from the opening 106. Figure 1B As shown, when the cover 102 is in the closed state, the cover 102 covers the opening 106. The control unit 50 can generate a closing control signal and transmit it to the drive module 30 to control the drive module 30 to drive the cover 102 to switch from the open state to the closed state.

[0044] The sensing module 40 includes a sensing unit 42, which is disposed at least at one of the periphery of the opening 106 of the body 101 and the periphery of the cover 102 facing the opening 106. The sensing module 40 generates a first sensing signal based on parameter changes caused by an external object contacting the sensing unit 42. The control unit 50 is electrically connected to the sensing module 40 to receive the first sensing signal. When the drive module 30 is driving the cover 102 from an open state to a closed state and the control unit 50 receives the first sensing signal, the control unit 50 generates a control signal based on the first sensing signal. The control signal is used to control the drive module 30 to stop driving the cover 102 to the closed state or to start driving the cover 102 to the open state. Furthermore, if no external object contacts the sensing unit 42, the sensing unit 42 does not generate parameter changes, and the sensing module 40 generates a second sensing signal to the control unit 50. Upon receiving the second sensing signal, the control unit 50 generates a shutdown control signal and transmits it to the drive module 30. When the drive module 30 is driving the cover 102 from the open state to the closed state and the drive module 30 receives a closing control signal generated by the control unit 50, the drive module 30 continues to drive the cover 102 to the closed state. In other words, when no external object touches the sensing unit 42, the control unit 50 does not generate a control signal to control the drive module 30 to stop driving the cover 102 to the closed state or to start driving the cover 102 to the open state.

[0045] The control unit 50 is a device with functions such as information or signal processing, handling, temporary storage, and output. Examples include a microcontroller unit (MCU), a central processing unit (CPU), or a system-on-a-chip (SoC). A microcontroller is a small, low-power control chip that typically includes a core processor, memory, and storage device interfaces. A system-on-a-chip integrates all system functions onto a single chip, including a combination of a central processing unit, a graphics processing unit (GPU), memory, storage device interfaces, and communication modules.

[0046] The drive module 30 includes a motor drive unit 32 and a motor 34. The motor 34 may be, for example, an electric motor, a servo motor, a stepper motor, or other actuating device that can provide rotation, linear movement, or other forms of displacement. The motor drive unit 32 is electrically connected to the control unit 50 and the motor 34. The motor drive unit 32 is controlled by the control unit 50. When the control unit 50 generates a control signal, the motor drive unit 32 of the drive module 30 drives the motor 34 to switch the cover 102 between a closed state and an open state.

[0047] In some embodiments, the projection device 1 includes an illumination system, an optical engine, and a projection lens. The illumination system provides an illumination beam. The optical engine includes an optical valve disposed in the transmission path of the output illumination beam to convert the output illumination beam into a projection beam. The projection lens is disposed in the transmission path of the projection beam to project the projection beam out of the projection device 1. The optical valve is, for example, a reflective light modulator such as a Liquid Crystal On Silicon panel (LCoS panel) or a Digital Micro-mirror Device (DMD). In some embodiments, the optical valve may also be a transmissive light modulator such as a Transparent Liquid Crystal Panel, an Electro-Optical Modulator, a Magneto-Optic Modulator, or an Acousto-Optic Modulator (AOM). This invention does not limit the type or form of the optical valve.

[0048] Projection lenses may include, for example, combinations of one or more optical lenses with diopter properties, such as various combinations of non-planar lenses including biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens may further include planar optical lenses to reflect the projection beam from the light valve onto the projection target. This invention does not limit the type or form of the projection lens.

[0049] Please see Figure 3 , Figure 3 This is another block diagram of the projection device of the present invention. In some embodiments, the projection device 1 further includes an input interface 80, which is electrically connected to a control unit 50. The control unit 50 generates a closing control signal according to a closing command received from the input interface 80, and transmits the closing control signal to the drive module 30 to control the drive module 30 to start driving the cover 102 from an open state to a closed state. Furthermore, while the control drive module 30 is driving the cover 102 from an open state to a closed state, the sensing module 40 generates a first sensing signal or a second sensing signal based on whether an external object is in contact with the sensing unit 42.

[0050] Please continue reading. Figure 3In some embodiments, the sensing module 40 includes a signal processing unit 44 electrically connected to the sensing unit 42. The signal processing unit 44 processes and judges parameter changes generated by external object contact with the sensing unit 42 to generate corresponding first sensing signals and / or second sensing signals. The control unit 50 is electrically connected to the signal processing unit 44 to receive the first sensing signals and / or second sensing signals. The signal processing unit 44 is, for example, a digital signal processor (DSP), a microcontroller unit (MCU), a central processing unit (CPU), a graphics processing unit (GPU), etc. The signal processing unit 44 generates the first sensing signal or the second control signal based on parameter changes generated by external object contact with the sensing unit 42. The signal processing unit 44 can determine whether or not the parameters generated by the sensing unit 42 have changed to generate digitized first sensing signals or second sensing signals to the control unit 50.

[0051] Please see Figure 4 , Figure 4 This is a schematic diagram of the surface of the cover of this utility model facing the opening. Figure 4 As shown, the periphery of the cover 102 includes two short sides 1021 and 1022 and two long sides 1023 and 1024. Generally, the area of ​​the cover 102 adjacent to one of the long sides (e.g., long side 1023) is used to engage with a rotating shaft or other transmission mechanism for connecting the drive module 30, so the long side 1023 does not need to be equipped with the sensing unit 42. Therefore, the sensing unit 42 is disposed at least partially around the periphery of the cover 102, such as in some embodiments. Figure 4 As shown, the sensing unit 42 is disposed on the two short sides 1021 and 1022 and another long side (e.g., long side 1024) of the cover 102; in other embodiments, the sensing unit 42 may be disposed only on the two short sides 1021 and 1022 and not on any of the long sides 1023 and 1024, or the sensing unit 42 may be disposed only on one long side 1024 and not on any of the short sides 1021 and 1022.

[0052] Please also refer to Figures 5 to 7 The sensing unit 42 is disposed on at least a portion of the periphery of the opening 106 of the body 101. Corresponding to the two short sides 1021, 1022 and the two long sides 1023, 1024 of the cover 102, the periphery of the opening 106 includes two short sides 1061, 1062 and two long sides 1063, 1064. The sensing unit 42 is disposed on at least one of the two short sides 1061, 1062 and / or one of the long sides 1064 of the opening 106. Specifically, the sensing unit 42 can be disposed in the following positions. Figure 5 This is a top plan view of one arrangement of the sensing unit in the projection device of the present invention at the opening. The sensing unit 42 is disposed on the two short sides 1061, 1062 and the second long side 1064 of the opening 106. Figure 6 This is a top view schematic diagram of another arrangement of the sensing unit in the projection device of this utility model at the opening. The sensing unit 42 is disposed on the two short sides 1061 and 1062 of the opening 106. Figure 7 This is a top view schematic diagram of another arrangement of the sensing unit in the projection device of this utility model at the opening, wherein the sensing unit 42 is disposed on the second long side 1064 of the opening 106.

[0053] Figure 8 The projection device of this utility model and a partially enlarged schematic diagram show that the opening 106 includes a fitting groove 1066 formed by the indentation of the surface of the body 101. When the sensing unit 42 is disposed in the opening 106 of the body 101, the sensing unit 42 is disposed in at least a portion of the fitting groove 1066 and / or the surface 1011 of the body 101 along at least a portion of the periphery of the opening 106.

[0054] The sensing unit 42 can be disposed in the opening in various ways, including the following. Figure 9 This is a schematic diagram illustrating one arrangement of the sensing unit of the projection device of this utility model relative to the fitting groove, wherein the sensing unit 42 is disposed within the fitting groove 1066. Figure 10 This is a schematic diagram of another arrangement of the sensing unit of the projection device of this utility model relative to the fitting groove, wherein the sensing unit 42 is disposed in the fitting groove 1066 and along the periphery of the opening 106 on the surface 1011 of the body 101. Figure 11 This is a schematic diagram of another arrangement of the sensing unit of the projection device of the present invention relative to the fitting groove, wherein the sensing unit 42 is disposed on the surface 1011 of the body 101 along the periphery of the opening 106 rather than disposed in the fitting groove 1066.

[0055] Figure 12 The present invention is shown in a partial enlarged schematic diagram of a flip-top projection device. In this embodiment, the projection device 1 includes a transmission module 60, which includes a rotating shaft 64. A drive module 30 is connected to the cover 102 through the transmission module 60, and drives the cover 102 to pivot about the rotating shaft 64 through the transmission module 60, so that the cover 102 switches between an open state and a closed state.

[0056] Specifically, in this embodiment, the cover 102 is a flip-top cover. The transmission module 60 further includes a cover connecting structure 62 and a motor connecting bearing 66. One end of the cover connecting structure 62 is connected to the cover 102 and can be displaced by the rotating shaft 64, thereby causing the cover 102 to pivot. The rotating shaft 64 is connected to the motor 34 of the drive module 30 through the motor connecting bearing 66, so that the motor 34 can drive the cover connecting structure 62 through the rotating shaft 64, thereby driving the cover 102 to pivot relative to the body 101, and causing the cover 102 to switch between a closed state and an open state relative to the opening 106. In some embodiments, the rotating shaft 64 is arranged adjacent to and parallel to one of the long sides 1063.

[0057] In other embodiments, the cover 102 is a sliding cover. Figure 13 This is a schematic diagram of the sliding projection device of this utility model. The projection device 1 includes a transmission module 60, and a drive module 30 is connected to the cover 102 through the transmission module 60. The drive module 60 drives the cover 102 to move along a predetermined trajectory T, so that the cover 102 switches between a closed state and an open state relative to the opening 106. The predetermined trajectory T is at least partially parallel to the horizontal direction D1, so that the cover 102 moves parallel to the surface of the body 101, moving away from or close to the opening 106.

[0058] The following provides a more detailed description of the implementation of the sensing unit 42 and control unit 50 of this application. When the drive module 30 is driving the cover 102 from an open state to a closed state, if an external object, such as a user's finger or other object, touches the sensing unit 42, it will cause a parameter change in the sensing unit 42, thereby generating a first sensing signal in the sensing module 40. When the sensing unit 42 does not generate a parameter change, it indicates that no external object is touching the sensing unit 42, the sensing module 40 generates a second sensing signal, and the drive module 30 continues to drive the cover 102 to the closed state. The first or second sensing signal can be an analog electrical signal directly generated by the sensing unit 42, or it can be a digital electrical signal generated by the signal processing unit 44 after processing and judging the analog electrical signal generated by the sensing unit 42. Different embodiments will be described below.

[0059] Figure 14This is a circuit block diagram of the projection device according to the first embodiment of the present invention. The sensing unit 42 includes a first conductor 421 and a second conductor 422. The first conductor 421 is connected to a ground terminal, and the second conductor 422 is further connected to a voltage source 423, which provides a first potential. The first conductor 421 is disposed on at least a portion of the periphery of the opening 106, and the second conductor 422 is disposed on at least a portion of the periphery of the cover 102; or, the first conductor 421 is disposed on at least a portion of the periphery of the cover 102, and the second conductor 422 is disposed on at least a portion of the periphery of the opening 106. When the cover 102 is in the closed state, the positions of the first conductor 421 and the second conductor 422 correspond to each other, for example, being adjacent to each other and having a gap. The control unit 50 includes a grounding pin 51 and a potential change pin 52. The first conductor 421 is electrically connected to the grounding pin 51, and the second conductor 422 is electrically connected to the potential change pin 52. The potential signal received by the control unit 50 via the potential change pin 52 is either the first sensing signal or the second sensing signal. When an external object simultaneously contacts the first conductor 421 and the second conductor 422 (e.g., a user's finger is caught between the opening 106 of the cover 102 and the body 101), causing the first conductor 421 and the second conductor 422 to conduct, the potential change of the potential change pin 52, for example, from the first potential to below a first threshold, is the first sensing signal. If no external object simultaneously contacts the first conductor 421 and the second conductor 422, causing the first conductor 421 and the second conductor 422 to conduct, the potential change pin 52 maintains the first potential, and the potential does not change; this is the second sensing signal.

[0060] Figure 15This is a circuit block diagram of the projection device according to the second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that the sensing module 40 further includes a signal processing unit 44. The signal processing unit 44 includes a grounding pin 441, a potential change pin 442, and an output pin 443. A first conductor 421 is electrically connected to the grounding pin 441, a second conductor is electrically connected to the potential change pin 442 and a voltage source 423, and the output pin 443 is electrically connected to the control unit 50 to output a first sensing signal or a second sensing signal. The grounding pin 441 is electrically connected to the first conductor 421 of the sensing unit 42, and the potential change pin 442 is electrically connected to the second conductor 422 of the sensing unit 42. The signal processing unit 44 generates a first sensing signal or a second control signal based on the parameter changes caused by an external object contacting the first conductor 421 and the second conductor 422 of the sensing unit 42. Specifically, when an external object simultaneously contacts both the first conductor 421 and the second conductor 422 (e.g., a user's finger is caught between the opening 106 of the cover 102 and the body 101), causing conduction between the first conductor 421 and the second conductor 422, the potential of the potential change pin 52 decreases from the first potential to below a first threshold, and the signal processing unit 44 generates a first sensing signal accordingly. If no external object simultaneously contacts both the first conductor 421 and the second conductor 422, causing conduction between them, the potential of the potential change pin 52 remains at the first potential, and the signal processing unit 44 generates a second sensing signal accordingly. In other words, the difference between the second embodiment and the first embodiment is that by adding a signal processing unit 44, the parameters generated by the sensing unit 42 are judged, and the signal processing unit 44 determines whether to output a first sensing signal or a second sensing signal to the control unit 50 based on whether the parameters change.

[0061] Figure 16This is a circuit block diagram of the projection device according to the third embodiment of the present invention. The sensing unit 42 includes at least one pressure sensor, which includes a variable resistor R1 and a resistor R2 whose resistance changes according to external force. It is connected to a voltage source Vcc and outputs an output voltage Vout to the control unit 50. The output voltage Vout is determined by the resistance value of the variable resistor R1. When no external object touches the sensing unit 42, the resistance value of the variable resistor R1 does not change and remains at a preset voltage parameter; the output voltage Vout also does not change. This is the second sensing signal. When an external object touches the sensing unit 42, causing a change in the resistance value of the variable resistor R1, the output voltage Vout also changes. This is the first sensing signal. The change in the first sensing signal and the voltage value of the second sensing signal are determined by the voltage value of the voltage source Vcc, the values ​​of the variable resistors R1 and R2, and their connection method, which will not be elaborated here. In this embodiment, the number of sensing units 42 can be one, and it can be disposed on either the periphery of the cover or the opening of the body; the number of sensing units 42 can also be at least two, and they can be disposed on the periphery of the cover and the opening of the body respectively, so as to simultaneously sense whether an external object is in contact with the periphery of the body and the opening of the body. The pressure sensor is, for example, a membrane force sensor.

[0062] Figure 17 This is a circuit block diagram of the projection device according to the fourth embodiment of the present invention. The sensing module 40 of the fourth embodiment further includes a signal processing unit 44. The sensing unit 42 includes at least one pressure sensor, which includes at least a variable resistor R1 and a resistor R2 whose resistance changes according to external force, is connected to a voltage source Vcc, and outputs an output voltage Vout to the signal processing unit 44. The output voltage Vout is determined according to the resistance value of the variable resistor R1. The signal processing unit 44 is electrically connected to the sensing unit 42 and the control unit 50. The signal processing unit 44 generates a first sensing signal or a second control signal according to the parameter changes caused by an external object contacting the sensing unit 42. When the output voltage Vout provided by the sensing unit 42 changes, the signal processing unit 44 generates the first sensing signal accordingly; when the output voltage Vout provided by the sensing unit 42 remains unchanged and is at a preset voltage parameter, it is the second sensing signal, and the signal processing unit 44 generates the second sensing signal accordingly. The sensing unit 42 in the fourth embodiment is the same as the sensing unit 42 in the third embodiment. The difference is that the fourth embodiment further includes a signal processing unit 44, which determines whether the voltage parameters of the sensing unit 42 have changed and generates a digitized first sensing signal or a second sensing signal to the control unit 50.

[0063] Figure 18This is a circuit block diagram of the projection device according to the fifth embodiment of the present invention. The sensing unit 42 includes at least one capacitive sensor 424. One receiving end of the capacitive sensor 424 is electrically connected to the control unit 50. The control unit 50 can determine the capacitance value of the capacitive sensor 424 based on the amount of charge at the receiving end of the capacitive sensor 424. When an external object, such as a user's finger, approaches or touches the capacitive sensor 424, the charge and capacitance value on the capacitive sensor 424 change; this is the first sensing signal. When no external object approaches or touches the capacitive sensor 424, the charge and capacitance value on the capacitive sensor 424 remain unchanged and are at a preset charge parameter or a preset capacitance parameter; this is the second sensing signal.

[0064] Figure 19 This is a circuit block diagram of the projection device according to the sixth embodiment of the present invention. The sensing unit 42 includes a capacitive sensor 424, and the sensing module 40 further includes a signal processing unit 44. The signal processing unit 44 is electrically connected to the receiving end of the capacitive sensor 424 and the control unit 50. The change in charge or capacitance value generated by the capacitive sensor 424 based on whether an external object is in contact is the same as in the fifth embodiment, and will not be repeated here. When the charge and capacitance value on the capacitive sensor 424 change, the signal processing unit 44 generates a first sensing signal; when the charge and capacitance value on the capacitive sensor 424 remain unchanged and are at a preset charge parameter or preset capacitance parameter, this is a second sensing signal. The signal processing unit 44 generates the second sensing signal. In other words, the sensing unit 42 of the sensing module 40 in the sixth embodiment is the same as the sensing unit 42 in the fifth embodiment, except that the sensing module 40 further includes a signal processing unit 44, and the signal processing unit 44 determines whether the charge / capacitance of the sensing unit 42 changes to generate a digital first sensing signal or a second sensing signal to the control unit 50.

[0065] It should be noted that, Figures 14 to 19 The sensing unit 42 shown in the illustration is a circuit diagram for illustrative purposes. The actual circuits of each embodiment can be designed and configured differently depending on the type of sensing unit 42 and the sensing requirements.

[0066] In summary, the control unit 50 determines whether to control the drive module 30 to stop driving the cover 102 to the closed state / start driving the cover 102 to the open state, or to control the drive module 30 to continue driving the cover 102 to the closed state, depending on whether the received signal is the first sensing signal or the second sensing signal.

[0067] In summary, the sensing unit 42 of this utility model can be a charge change sensing unit, a pressure change sensing unit, or a voltage change sensing unit, and the parameter changes can be potential parameter changes, voltage parameter changes, or capacitance parameter changes. This is not limited in the various embodiments of this utility model.

[0068] Based on the above, the embodiments of this utility model have at least one of the following advantages or effects: by setting a sensing unit on the opening or the cover, the user's fingers around the opening can be sensed in real time, preventing the projector cover from continuing to close when it touches or pinches external objects or human bodies, thereby preventing damage to the projection device, external objects or human bodies, and improving the safety of use.

[0069] The above description is merely a preferred embodiment of this utility model and should not be construed as limiting the scope of this utility model. Any simple equivalent changes and modifications made based on the claims and description of this utility model are still within the scope of this utility model. Furthermore, no embodiment or claim of this utility model needs to achieve all the objectives, advantages, or features disclosed in this utility model. In addition, the abstract and headings are merely for assisting in patent document searches and are not intended to limit the scope of this utility model. Moreover, the terms "first," "second," etc., mentioned in this specification or claims are only used to name components or distinguish different embodiments or scopes, and are not intended to limit the upper or lower limits of the number of components.

Claims

1. A projection device, characterized in that, include: A housing includes a body and a cover, the cover being connected to the body and adapted to move relative to the body, the body having an accommodating space and an opening, the accommodating space communicating with the opening; A projection system, disposed within the accommodating space, is used to provide a projection beam; A drive module is connected to the cover and drives the cover to switch between a closed state and an open state; when the cover is in the closed state, the cover covers the opening; when the cover is in the open state, the cover does not cover the opening, and the opening is adapted to allow the projection beam projected by the projection system to pass through. A sensing module includes a sensing unit disposed at at least one of the periphery of the opening on the body and the periphery of the cover facing the opening. The sensing module generates a first sensing signal based on parameter changes caused by an external object contacting the sensing unit. as well as The control unit is electrically connected to the sensing module and the driving module, receives the first sensing signal, and generates a control signal based on the first sensing signal; the control signal is used to control the driving module to stop driving the cover to the closed state or to start driving the cover to the open state.

2. The projection device as described in claim 1, characterized in that, The sensing unit includes a first conductor and a second conductor, the first conductor being disposed on at least a portion of the periphery of the opening, and the second conductor being disposed on at least a portion of the periphery of the cover; When the cover is in the closed state, the positions of the first conductor and the second conductor are corresponding.

3. The projection device as described in claim 2, characterized in that, The control unit includes a grounding pin and a potential change pin. The first conductor is electrically connected to the grounding pin, and the second conductor is electrically connected to the potential change pin and a voltage source. The first sensing signal is a first potential provided by the second conductor to the potential change pin.

4. The projection device as described in claim 2, characterized in that, The sensing module includes a signal processing unit, which includes a ground pin, a potential change pin, and an output pin. The first conductor is electrically connected to the ground pin, and the second conductor is electrically connected to the potential change pin and a voltage source. The output pin is electrically connected to the control unit to output the first sensing signal.

5. The projection device as described in claim 2, characterized in that, The sensing unit includes a pressure sensor or a capacitive sensor, and the sensing unit is disposed at at least a portion of the periphery of the opening of the body or at least a portion of the periphery of the cover.

6. The projection device as described in claim 5, characterized in that, The sensing module includes a signal processing unit electrically connected to the sensing unit and the control unit, and the signal processing unit generates the first sensing signal based on the parameter changes caused by the external object contacting the sensing unit.

7. The projection device as described in any one of claims 1 to 6, characterized in that, It also includes a transmission module; The drive module is connected to the cover through the transmission module, and drives the cover to move along a predetermined trajectory through the transmission module, so that the cover switches between a closed state and an open state relative to the opening.

8. The projection device as described in any one of claims 1 to 5, characterized in that, It further includes a transmission module, which includes a rotating shaft; the drive module is connected to the cover through the rotating shaft of the transmission module, and drives the cover to rotate around the rotating shaft, so that the cover switches between a closed state and an open state relative to the opening.

9. The projection device as claimed in claim 8, characterized in that, The opening has two short sides and two long sides, and the rotating shafts are arranged adjacent to each other and parallel to one of the long sides.

10. The projection device as claimed in claim 9, characterized in that, The sensing unit is disposed on the two short sides and / or the other long side of the opening.

11. The projection device as claimed in claim 1, characterized in that, The sensing unit is a charge change sensing unit, a pressure change sensing unit, or a voltage change sensing unit.

12. The projection device as claimed in claim 1, characterized in that, The parameter changes are changes in potential parameters, voltage parameters, capacitance parameters, or resistance parameters.

13. The projection device according to any one of claims 1 to 6, characterized in that, The opening includes a fitting groove formed by the recess of the surface of the body, and the sensing unit is disposed in at least a portion of the fitting groove and / or on at least a portion of the periphery of the opening along the surface of the body.

14. The projection device according to any one of claims 1 to 6, characterized in that, It also includes an input interface; The input interface is electrically connected to the control unit. The control unit generates a closing control signal based on the closing command received from the input interface. The closing control signal is used to control the drive module to start driving the cover to switch from the open state to the closed state.

15. The projection device according to any one of claims 1 to 6, characterized in that, When the sensing module does not generate the parameter change based on the contact of an external object with the sensing unit, the sensing module generates a second sensing signal; The control unit controls the drive module to continue driving the cover to the closed state based on the second sensing signal.

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