Vehicle-mounted screen and control circuit thereof

Abstract

The utility model discloses a vehicle-mounted screen and a control circuit thereof, and relates to the field of vehicle-mounted articles, a screen supporting structure is arranged in a shell used for rolling up the screen, the screen supporting structure comprises a limiting structure and a supporting structure stretching and retracting along the vertical direction, one end of the supporting structure is connected with the shell, and the other end of the supporting structure is connected with the limiting structure. One end of the screen supporting mechanism is connected with the free end of the screen, the other end of the screen supporting mechanism is connected with the free end of the screen and moves in the vertical direction along with movement of the free end of the screen, in the screen opening process, the free end of the screen moves downwards, and the other end of the screen supporting mechanism synchronously moves downwards in the vertical direction along with unfolding of the screen. The limiting structure is used for limiting the extension length of the supporting structure, so that the screen is kept in a flattened state, and the viewing experience of passengers is improved; and meanwhile, the shaking amplitude of the screen along with the vehicle is reduced, and the damage to the whole vehicle-mounted screen device is reduced.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted products, and in particular to a vehicle-mounted screen and its control circuit. Background Technology

[0002] Modern consumers have increasingly higher demands for their driving experience, hoping to enjoy a similar level of comfort and entertainment as at home within their vehicles. During long journeys, people want to utilize their time in the car for entertainment and relaxation, such as watching movies or television programs. The emergence of in-car screens provides a new solution for in-car entertainment, meeting consumers' diverse entertainment needs.

[0003] Existing in-vehicle screens, once unfolded, can only remain suspended, resulting in reduced stability. When traversing roads with poor conditions, the screen sways due to the vehicle's bumps, affecting not only the passenger's viewing experience but also potentially damaging the screen itself and the in-vehicle screen assembly during the swaying motion. Therefore, there is a need for an in-vehicle screen that can fix the unfolded screen, reduce the amplitude of its swaying with the vehicle, prevent damage, and improve the passenger's viewing experience. Utility Model Content

[0004] The purpose of this utility model is to provide a vehicle-mounted screen and its control circuit to solve the problems existing in the prior art, so that the free end of the screen can be fixed after it is unfolded, so that the screen as a whole is in a flat state and the passenger's viewing experience is guaranteed.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a vehicle-mounted screen, including a housing and a screen rolled up inside the housing, wherein a screen support mechanism is provided on the top surface of the housing;

[0006] The screen support mechanism includes a limiting structure and a support structure that extends and retracts in the vertical direction. One end of the support structure is connected to the housing, and the other end is connected to the free end of the screen and moves in the vertical direction as the free end of the screen moves. The limiting structure is used to keep the support structure at a fixed elongation length.

[0007] In one embodiment, the support structure includes a support frame, which includes at least two connecting rods, the ends of which are rotatably connected. The free end of one connecting rod is rotatably connected to the housing, the free end of the other connecting rod is rotatably connected to the base plate, and the free end of the screen is connected to the base plate.

[0008] In one embodiment, the limiting structure includes an electromagnetic lock. The end of the connecting rod that is rotatably connected to the inner sidewall of the housing is provided with teeth. The electromagnetic lock is provided with a locking tongue that engages with the teeth. The electromagnetic lock is located on one side of the support frame and is used to control the overall extension and retraction length of the support frame through the locking tongue.

[0009] In one embodiment, the screen driving mechanism is further provided with a bearing support and a motor support, the motor is arranged on the motor support, and the output shaft of the motor faces the bearing support; a transmission shaft is arranged on the output shaft of the motor, and the axis of the transmission shaft coincides with the axis of the output shaft of the motor; a passive connection shaft is arranged on the bearing support and faces the motor support, and the axis of the passive connection shaft coincides with the axis of the transmission shaft; and the two ends of the reel are respectively sleeved on the outer sides of the motor, the transmission shaft and the passive connection shaft, and are fixedly connected with the inner walls of the reel through the passive connection shaft and the transmission shaft.

[0010] In one embodiment, the screen driving mechanism is further provided with a bearing support and a motor support, the motor is arranged on the motor support, and the output shaft of the motor faces the bearing support; a transmission shaft is arranged on the output shaft of the motor, and the axis of the transmission shaft coincides with the axis of the output shaft of the motor; a passive connection shaft is arranged on the bearing support and faces the motor support, and the axis of the passive connection shaft coincides with the axis of the transmission shaft; and the two ends of the reel are respectively sleeved on the outer sides of the motor, the transmission shaft and the passive connection shaft, and are fixedly connected with the inner walls of the reel through the passive connection shaft and the transmission shaft.

[0011] In one embodiment, the outer side of the reel is provided with a fixed surface recessed towards the axis of the reel, the length of the fixed surface along the axial direction of the reel is less than the length of the reel, the fixed surface is provided with a reel pressing strip for fixing the end of the screen on the reel, the reel pressing strip is embedded in the fixed surface, and the curvature of the side of the reel pressing strip away from the fixed surface is the same as the curvature of the reel.

[0012] In one embodiment, the end of the transmission shaft away from the motor and the end of the passive connection shaft away from the bearing support are both provided with a transmission plane, and the inner wall of the reel is provided with a protruding step surface, and the transmission plane abuts against the step surface.

[0013] In one embodiment, the transmission plane is provided with a first through hole, the outer side of the reel is provided with a second through hole corresponding to the step surface, the second through hole penetrates the reel, the axis of the first through hole coincides with the axis of the second through hole, and a fixed pin is arranged in the first through hole and the second through hole.

[0014] In one embodiment, the free end of the screen is provided with a stretching fixing strip, and the screen is fixedly connected with the bottom plate through the stretching fixing strip.

[0015] In one embodiment, the opposite side of the bottom plate connected with the connecting rod is provided with a pressure-sensitive sensor, the pressure-sensitive sensor is in a strip shape and is arranged along the length direction of the bottom plate, at least two groups of pressure-sensitive sensors are arranged along the width direction of the bottom plate, and the pressure-sensitive sensor is electrically connected with the motor and the electromagnetic lock.

[0016] To achieve the above-mentioned purpose, the utility model further provides a control circuit of vehicle-mounted screen, the control circuit is applied to the above-mentioned vehicle-mounted screen, and the control circuit includes: motor drive circuit, electromagnetic lock control circuit, pressure-sensitive sensor circuit and single-chip microcomputer.

[0017] The motor driving circuit is used for driving the motor to work; the electromagnetic lock control circuit is used for controlling the opening and closing of the electromagnetic lock; and the pressure sensor circuit is used for detecting the pressure generated on the bottom plate.

[0018] The single-chip microcomputer is connected with the motor driving circuit, the electromagnetic lock control circuit and the pressure sensor circuit respectively, and is used for controlling the motor driving circuit, the electromagnetic lock control circuit and the pressure sensor circuit.

[0019] Compared with the prior art, the utility model discloses the following technical effects are obtained:

[0020] The shell for winding the screen is provided with a screen supporting structure, the screen supporting structure comprises a limiting structure and a supporting structure telescoping in the vertical direction, one end of the supporting structure is connected with the shell, after the screen is opened, the free end of the screen moves downward, the other end of the screen supporting structure moves downward along the vertical direction synchronously with the unfolding of the screen, after the screen is unfolded to a proper size, the limiting structure is used for limiting the extension length of the supporting structure, so that the screen keeps the flat state, and the viewing experience of passengers is improved, meanwhile, the shaking amplitude of the screen with the vehicle is reduced, and the damage to the whole vehicle-mounted screen is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying the creative labor.

[0022] Figure 1 It is the whole structure schematic diagram of the vehicle-mounted screen in the embodiment of the utility model;

[0023] Figure 2 It is the schematic diagram of the shell structure in the vehicle-mounted screen in the embodiment of the utility model;

[0024] Figure 3 It is the structural schematic diagram of the reel not provided with the screen in the shell in the vehicle-mounted screen in the embodiment of the utility model;

[0025] Figure 4 It is the structural schematic diagram of the driving device of the reel in the vehicle-mounted screen in the embodiment of the utility model;

[0026] Figure 5 It is the whole structure schematic diagram of the screen driving mechanism in the vehicle-mounted screen in the embodiment of the utility model;

[0027] Figure 6 It is the overhead schematic diagram of the screen driving mechanism in the vehicle-mounted screen in the embodiment of the utility model;

[0028] Figure 7 It is the cross section structure schematic view of the screen driving mechanism in the vehicle-mounted screen in the embodiment of the utility model along A-A direction in the overhead state;

[0029] Figure 8 It is the whole structure schematic view of the screen support mechanism in the vehicle-mounted screen in the embodiment of the utility model;

[0030] Figure 9 It is the end structure schematic view of the one end of the connecting rod and the shell connection of the screen support mechanism in the vehicle-mounted screen in the embodiment of the utility model;

[0031] Figure 10 It is the structure schematic view of the electromagnetic lock of the screen support mechanism in the vehicle-mounted screen in the embodiment of the utility model;

[0032] Figure 11 It is the structure schematic view of the three groups of pressure sensitive sensors on the bottom plate in the vehicle-mounted screen in the embodiment of the utility model;

[0033] Figure 12 It is the structure schematic view of the passive connecting shaft in the vehicle-mounted screen in the embodiment of the utility model;

[0034] Figure 13 It is the structure schematic view of the reel in the vehicle-mounted screen in the embodiment of the utility model;

[0035] Figure 14 It is the enlarged schematic view of the structure at reel A in the vehicle-mounted screen in the embodiment of the utility model;

[0036] Figure 15 It is the structure block diagram of the control circuit in the embodiment of the utility model;

[0037] Figure 16 It is the schematic view of the motor drive circuit in the embodiment of the utility model;

[0038] Figure 17 It is the schematic view of the electromagnetic lock control circuit in the embodiment of the utility model;

[0039] Figure 18 It is the schematic view of the pressure sensitive sensor circuit in the embodiment of the utility model;

[0040] Figure 19 It is the circuit schematic view of the single-chip microcomputer in the embodiment of the utility model

[0041] Figure 20 It is the schematic view of the button circuit in the embodiment of the utility model;

[0042] Figure 21 It is the schematic view of the infrared sensor circuit in the embodiment of the utility model;

[0043] Figure 22 The utility model discloses a schematic view of power supply circuit in the embodiment of the utility model.

[0044] Wherein, 1, shell;2, connecting rod;3, reel;4, bottom plate;5, stretch fixed strip;6, pressure sensor;7, electromagnetic lock;8, motor support;9, bearing support;10, reel pressure strip;11, motor;12, shaft coupling;13, O ring;14, connecting transmission shaft;15, transmission plane;16, fixed surface;17, fixed pin;18, passive connecting shaft;19, support seat;20, gear teeth;21, lock tongue;22, pivot seat;23, keyway;24, flat key;25, step surface. DETAILED DESCRIPTION

[0045] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings of the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0046] The utility model discloses a kind of vehicle-mounted screens and control circuit, to solve the problems existing in prior art, so that screen can keep relative stability with vehicle, improve passenger viewing experience, while reducing damage to vehicle-mounted screen due to vehicle shaking.

[0047] To make the above-mentioned purposes, features and advantages of the utility model more apparent and easy to understand, the utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0048] Please refer to Figure 1 In the embodiment, the vehicle-mounted screen includes a housing 1, the screen is rolled up inside the housing 1, and a screen support mechanism is provided on the top surface of the housing 1. The screen support mechanism includes a limiting structure and a support structure. The support structure can be extended and retracted in the vertical direction to change its length. One end of the support structure is connected to the top surface of the housing 1. During use, the free end of the screen moves downward from the housing 1, dragging the screen rolled up inside the housing 1 to unroll. During the unrolling of the screen, the other end of the support structure moves downward along the vertical direction with the unrolling of the screen until the screen is unrolled to an appropriate size. At this time, the limiting structure locks the support structure to limit the extension length of the support structure. The support structure supports the unrolled screen to prevent the screen from shaking with the vehicle. At the same time, the extension length of the support structure is equal to the unrolling length of the screen. The support structure ensures that the screen is in a flat state, improving the viewing experience of passengers.

[0049] Please refer to Figure 1 ,Figure 8 and Figure 9 The support structure can be a support frame, which comprises at least two connecting rods 2, the ends of which are rotatably connected, wherein the free end of one connecting rod 2 is rotatably connected to the shell 1, and the connecting position of the free end of the connecting rod 2 to the shell 1 is located on the inner side wall of the shell 1. In order to improve the stability of the connection between the connecting rod 2 and the shell 1, a support seat 19 is arranged on the top surface of the shell 1, and the connecting rod 2 is rotatably connected to the shell 1 through the support seat 19. The free end of the other connecting rod 2 is rotatably connected to the bottom plate 4. In order to ensure that the screen remains flat during the screen unfolding process, the free end of the screen is connected to the bottom plate 4, and the horizontal support of the screen is realized through the bottom plate 4.

[0050] Preferably, a rotating shaft seat 22 is arranged on the bottom plate 4, and the end of the connecting rod 2 rotatably connected to the bottom plate 4 is rotatably connected to the rotating shaft seat 22.

[0051] The number of support structures is arranged according to actual needs. Preferably, two support structures are arranged, and the free ends of the two support structures are arranged at the two ends of the reel 3, so as to simultaneously support the two ends of the bottom plate 4, avoid the screen from tilting during the unfolding process, and further improve the stability of the unfolded screen. The support mechanism includes but is not limited to a support frame, and can also be an electric telescopic rod, an air cylinder, or other mechanisms that can limit the arbitrary telescopic length during telescopic extension.

[0052] Please refer to Figure 9 and Figure 10 When the support structure is a support frame, the limiting mechanism is an electromagnetic lock 7. When the support frame is telescoping, the included angle between the connecting rod 2 rotatably connected to the shell 1 and the shell 1 is an acute angle. As the acute angle changes, the telescopic length of the support frame changes accordingly. The electromagnetic lock 7 is arranged on the side where the included angle between the connecting rod 2 and the shell 1 is obtuse. The end of the end of the connecting rod 2 rotatably connected to the inner side wall of the shell 1 is provided with a tooth 20. The side of the electromagnetic lock 7 facing the connecting rod 2 is provided with a lock tongue 21 engaged with the tooth 20. The lock tongue 21 of the electromagnetic lock 7 on one side of the support frame is engaged with the tooth 20 at the end of the connecting rod 2. During the process of the support frame extending with the screen, the lock tongue 21 of the electromagnetic lock 7 is retracted, and the connecting rod 2 rotatably connected to the shell 1 smoothly rotates. When the screen stops unfolding, the support frame stops extending, the lock tongue 21 of the electromagnetic lock 7 pops out and engages with the tooth 20 at the end of the connecting rod 2. The rotation of the connecting rod 2 is limited by the lock tongue 21, thereby controlling the extension length of the support frame as a whole to remain unchanged, maintaining the flat state of the screen, avoiding the screen from swinging due to the shaking of the vehicle, ensuring the viewing experience of the passengers, and further reducing the damage to the screen caused by the shaking of the vehicle.

[0053] In a preferred technical solution, the end of the connecting rod 2 rotatably connected with the shell 1 is provided with five teeth 20, four meshing intervals are formed at the end of the connecting rod 2, the locking tongue 21 of the electromagnetic lock 7 is popped into the meshing interval when the screen is unfolded 1 / 4, 2 / 4, 3 / 4 and 4 / 4 respectively, the overall extension length of the support frame is controlled by controlling the rotation angle of the connecting rod 2, so that the support frame can maintain the flat state of the screen when the screen is unfolded to different lengths, and the shaking of the screen is reduced.

[0054] Please refer to Figure 1 and Figure 5 , the vehicle-mounted screen further comprises a screen driving mechanism, the screen driving mechanism is arranged on the same side of the support frame and the electromagnetic lock 7, so as to avoid that the support frame hinders the normal folding and unfolding of the screen, the screen driving mechanism comprises a motor 11 and a reel 3, the motor 11 and the reel 3 are arranged in the interior of the shell 1, one end of the screen is fixed on the reel 3, so as to ensure that the screen can be smoothly wound on the reel 3, the motor 11 is used to drive the rotation of the reel 3, and the folding and unfolding of the screen by the reel 3 is realized by changing the rotation direction of the motor 11.

[0055] Since the traditional vehicle-mounted screen is generally an LCD screen or an LED screen, the structure for storing the screen occupies a large space in the vehicle cabin after use, even blocks the sunroof or the ceiling of the vehicle, and greatly limits the vehicle interior and the structural design, and in the technical solution, the screen is used to replace the traditional LCD screen or LED screen, the screen is wound on the reel 3 after storage, and the support frame for supporting the screen is folded, so that the occupied space of the screen after storage is further reduced; through test, the vehicle-mounted screen in the scheme can reduce the occupied space by 85% after storage.

[0056] In order to ensure the smooth folding and unfolding of the screen, the screen driving mechanism further comprises a bearing support 9 and a motor 11 support 8, the bearing support 9 and the motor 11 support 8 are also arranged on the top surface of the shell 1, the motor 11 is arranged on the motor 11 support 8, the output shaft of the motor 11 faces the bearing support 9, the connecting transmission shaft 14 is arranged on the output shaft of the motor 11, the axis line of the connecting transmission shaft 14 coincides with the axis line of the output shaft of the motor 11, the passive connecting shaft 18 is arranged on the bearing support 9, the passive connecting shaft 18 faces the motor 11 support 8, and the axis line of the passive connecting shaft 18 coincides with the axis line of the connecting transmission shaft 14;

[0057] Preferably, manufacturing errors and installation errors are inevitable during the process of structure manufacturing and installation, therefore, a shaft coupling 12 is arranged between the output shaft of the motor 11 and the connecting transmission shaft 14, the concentricity between the output shaft of the motor 11 and the connecting transmission shaft 14 is corrected, so that the output torque of the motor 11 can be smoothly transmitted to the connecting transmission shaft 14 and the reel 3, wherein the diameters of the motor 11, the connecting transmission shaft 14 and the passive connecting shaft 18 are smaller than the inner diameter of the reel 3, both ends of the reel 3 are respectively sleeved on the outer sides of the motor 11, the connecting transmission shaft 14 and the passive connecting shaft 18, the passive connecting shaft 18 and the connecting transmission shaft 14 are fixedly connected with the inner side wall of the reel 3, so as to ensure that the reel 3, the motor 11, the connecting transmission shaft 14 and the passive connecting shaft 18 rotate synchronously; an annular groove for placing an O-ring 13 is further arranged on the outer side surface of the connecting transmission shaft 14, the O-ring 13 is sleeved on the outer side surface of the connecting transmission shaft 14 through the annular groove, the extrusion force between the inner side wall of the reel 3 and the connecting transmission shaft 14 is buffered, so as to avoid collision between the reel 3 and the connecting transmission shaft 14 during the working process, and reduce the noise during the process of winding and unwinding the screen by the reel 3.

[0058] Please refer to Figure 5 In order to ensure the stability of the connection between the end of the screen and the reel 3, a fixed surface 16 recessed towards the axis direction of the reel 3 is arranged on the outer side surface of the reel 3, the length of the fixed surface 16 along the axial direction of the reel 3 is smaller than the length of the reel 3, and the reel 3 pressing strip is arranged on the fixed surface 16, the end of the screen is placed on the fixed surface 16 after being flattened, the reel 3 pressing strip is embedded in the fixed surface 16, the end of the screen is fixed on the reel 3 through the extrusion between the reel 3 pressing strip and the fixed surface 16, and in order to prevent the side of the reel 3 pressing strip away from the fixed surface 16 from damaging the screen, the side of the reel 3 pressing strip away from the fixed surface 16 is arranged as an arc surface with the same curvature as the reel 3.

[0059] Preferably, a plurality of through holes are arranged on the end of the screen, a plurality of fixing holes are arranged on the reel pressing strip 10, and a plurality of threaded holes are arranged on the fixed surface 16, the number of the through holes on the end of the screen, the number of the fixing holes on the reel pressing strip 10 and the number of the threaded holes on the fixed surface 16 are the same and are arranged one by one in correspondence, the end of the screen is placed on the fixed surface 16, the through holes on the end of the screen are aligned with the threaded holes on the fixed surface 16, the reel pressing strip 10 is embedded in the fixed surface 16 to press the screen tightly, and then a bolt is used to pass through the fixing hole and is screwed into the threaded hole arranged on the fixed surface 16, so as to further improve the connection stability between the screen and the reel 3 and between the reel pressing strip 10 and the reel 3.

[0060] Please refer to Figures 4 to 7 and Figures 12 to 14In order to improve the transmission efficiency between the connecting transmission shaft 14 and the passive connecting shaft 18 and the reel 3, a transmission plane 15 is arranged at the end of the connecting transmission shaft 14 away from the motor 11, a transmission plane 15 is also arranged at the end of the passive connecting shaft 18 away from the bearing support 9, and a protruding step surface 25 is arranged on the inner side wall of the reel 3. After the reel 3 is sleeved on the outer side of the connecting transmission shaft 14 and the passive connecting shaft 18, the transmission plane 15 abuts against the step surface 25, and the torque is transmitted through the cooperation between the transmission plane 15 and the step surface 25.

[0061] A key groove 23 is further arranged on the transmission plane 15, a flat key 24 matching the shape and size of the key groove 23 is arranged on the step surface 25, and the flat key 24 is inserted into the corresponding key groove 23 during the assembly of the reel 3 and the connecting transmission shaft 14 and the passive connecting shaft 18. The torque is transmitted through the cooperation between the flat key 24 and the key groove 23. As one of the embodiments, please refer to Figure 4 、 Figure 7 and Figure 12 and Figure 14 The key groove 23 is also arranged on the side symmetrical to the side where the transmission plane 15 is arranged on the connecting transmission shaft 14 and the passive connecting shaft 18, and the flat key 24 is also arranged on the side symmetrical to the side where the flat key 24 is arranged on the step surface 25 inside the reel 3, and two symmetrical flat keys 24 are arranged on the opposite side of the flat key 24 on the step surface 25, which are used to cooperate with the key groove 23 arranged on the connecting transmission shaft 14 and the passive connecting shaft 18.

[0062] Since the transmission connecting shaft and the passive connecting shaft 18 are arranged inside the reel 3, long-time abutment cooperation can easily cause the wear of the transmission plane 15 and the step surface 25, and reduce the transmission effect in the later period. Therefore, in order to ensure the stability of the torque transmission between the transmission connecting shaft 14 and the passive connecting shaft 18 and the reel 3, a first through hole is arranged on the transmission plane 15, a second through hole is arranged on the position corresponding to the step surface 25 on the outer side of the reel 3, and the second through hole penetrates the reel 3. In this embodiment, the first through hole is arranged at the bottom of the key groove 23, the second through hole penetrates the flat key 24, the reel 3 is sleeved on the outer side of the transmission connecting shaft 14 and the passive connecting shaft 18, the first through hole and the second through hole are coaxial after the transmission plane 15 abuts against the step surface 25, and a fixed pin 17 is arranged in the first through hole and the second through hole, so as to transmit the torque between the reel 3 and the connecting transmission shaft 14 and between the reel 3 and the passive transmission shaft. Preferably, a counterbore is arranged on the position corresponding to the second through hole on the outer side of the reel 3, and the end of the fixed pin 17 is hidden in the counterbore after the fixed pin 17 is inserted into the first through hole and the second through hole, so as to avoid the damage of the end of the fixed pin 17 to the screen.

[0063] Due to the flexibility of the screen as a whole, in the process of unfolding the screen, the free end of the screen will appear a curved surface in the vertical direction under uneven stress, affecting the viewing experience of passengers, therefore, a stretching fixing strip 5 is arranged at the free end of the screen, the stretching fixing strip 5 comprises two fixing strips, the two fixing strips are arranged at the front and back of the screen respectively, the free end of the screen is clamped between the two fixing strips, and the stretching fixing strip 5 composed of the two fixing strips is fixed on the bottom plate 4, in the process of dragging the free end of the screen to unfold on the bottom plate 4, the uniform stress of the free end of the screen is ensured, and the curved surface of the free end of the screen is avoided.

[0064] Please refer to Figure 1 and 11 Due to the narrow space in the vehicle, especially after the articles are placed in the vehicle, the height in the vehicle is reduced, and the accumulated articles form an obstacle below the vehicle-mounted screen, in order to avoid that the free end of the screen cannot continue to descend under the block of the obstacle in the process of unfolding the screen, and further cause the screen to appear wrinkles, in order to adjust the unfolding size of the screen in real time, a pressure sensor 6 is arranged at the opposite side of the bottom plate 4 and the connecting rod 2, the pressure sensor 6 is in a strip shape, the strip-shaped pressure sensor 6 is arranged along the length direction of the bottom plate 4, and at least two groups of the pressure sensor 6 are arranged along the width direction of the bottom plate 4, the two groups of pressure sensors 6 are arranged at the edge positions of the bottom plate 4 respectively, after the bottom plate 4 contacts the obstacle, the bottom plate 4 is inclined, the obstacle slides on the bottom plate 4 until the obstacle touches the pressure sensor 6, after the pressure sensor 6 detects that the pressure is generated on the bottom plate 4, the pressure sensor 6 controls the motor 11 to reverse, and the screen is retracted until no pressure signal is generated on the pressure sensor 6, the motor 11 controls the reel 3 to stop retracting the screen, at this time, the electromagnetic lock 7 is electrified, the lock tongue 21 is popped out and engaged with the gear teeth 20 at the end of the connecting rod 2, if the gear teeth 20 at the end of the connecting rod 2 cannot engage with the lock tongue 21, the screen is retracted by the motor 11 to control the reel 3, the bottom plate 4 is lifted to the upper side of the obstacle, until the lock tongue 21 is engaged with the gear teeth 20 at the end of the connecting rod 2, the electromagnetic lock 7 locks the extension length of the support frame, and the screen is kept in the flat state, and the damage of the screen caused by the shaking of the vehicle is reduced.

[0065] Preferably, in order to improve the detection range and sensitivity of the pressure sensor 6, a third group of pressure sensors 6 is arranged at the middle position of the bottom plate 4 on the basis of the above technical scheme, the detection range of the pressure sensor 6 is expanded, and no matter which position on the bottom plate 4 contacts the obstacle, the signal can be quickly transmitted to the motor 11, and the screen is prevented from continuing to unfold.

[0066] The adaptive changes according to actual requirements are all within the protection scope of the utility model.

[0067] In another embodiment, the utility model also provides a control circuit of a vehicle-mounted screen. Figure 15As shown, the control circuit includes: motor drive circuit, electromagnetic lock control circuit, pressure sensor circuit and single-chip microcomputer. The motor drive circuit is used to drive the motor to work; the electromagnetic lock control circuit is used to control the opening and closing of the electromagnetic lock; the pressure sensor circuit is used to detect the pressure generated on the bottom plate; the single-chip microcomputer is connected with the motor drive circuit, the electromagnetic lock control circuit and the pressure sensor circuit respectively, and is used to control the motor drive circuit, the electromagnetic lock control circuit and the pressure sensor circuit.

[0068] The current support selects a direct current motor with a Hall sensor, and the motor drive circuit is as shown in Figure 16 The functions of the motor drive circuit are as follows:

[0069] Function 1: speed control and forward / reverse rotation. U5 is an H-bridge drive chip, which can control the voltage of OUT1 and OUT2 output to the positive and negative electrodes of the motor. M_C1 / 2 is connected to the IO port of the single-chip microcomputer through a current limiting resistor. When M_C1 / 2 outputs high / low level, OUT1 / 2 outputs 12V / 0V. If it is necessary to control the motor to rotate forward, M_C1 outputs high level and M_C2 outputs low level. There is a positive 12V voltage difference between OUT1 and OUT2, and the motor rotates forward. If it is necessary to reverse, M_C1 outputs low level and M_C2 outputs high level. If it is necessary to control the speed, one of them is pulled low and the other is controlled by the duty cycle of PWM. If the input is all high level, the brake is applied. If the input is all low level, the chip enters low power consumption mode.

[0070] Function 2: motion feedback. The feedback end of the Hall sensor of the motor is connected to the IO port of the single-chip microcomputer through a current limiting resistor. By detecting the sequence and rising edge number of S1 and S2 signal waveforms, the motor forward / reverse rotation, the number of motion circles per unit time (speed) and the total number of motion circles (support position) are identified.

[0071] The electromagnetic lock control circuit is as shown in Figure 17 The single-chip microcomputer outputs high level through LOCK_CTR1, and R25 enhances the driving ability of this high level. Then Q1 is turned on, so that LOCK1 outputs 12V, so that the electromagnetic lock is powered on, the locking tongue is retracted, and the lock is released. When the output is low level, the electromagnetic lock will be restored to the original state to lock the support, but the electromagnetic lock is an inductive load, and an instantaneous reverse electromotive force will be generated when the electromagnetic lock is turned off. Here, a diode D2 is connected in reverse to release energy to the 12V power supply, preventing damage to the MOS tube Q1.

[0072] The pressure sensor is actually a pressure-sensitive resistor, but the resistance value changes when the surface of the sensor is pressed. As shown in Figure 18As shown, there are 3 pressure sensors, P1 is used, and the rest is reserved. R14, R15, R16 are used as voltage dividing resistors here, and the pressure sensors are inconsistent in pressure, and the resistors are inconsistent. The real-time pressure is input to the ADC of the single-chip microcomputer through the current limiting resistor, and once the pressure is applied, the single-chip microcomputer will respond immediately.

[0073] The minimum system of the single-chip microcomputer is the smallest unit that can make the single-chip microcomputer work. Figure 19 As shown, the single-chip microcomputer comprises: ① 3.3v power supply, provided by the power supply circuit. C6, C7 are power filter capacitors. ② Power-on reset circuit, composed of R4 and C9. ③ Without external crystal oscillator, using internal RC oscillator as clock source. ④ Download circuit, H1 provides external download interface and debugging serial port USART1.

[0074] When the single-chip microcomputer can work effectively, it becomes the brain of the whole system, and all signals will be input to the single-chip microcomputer, which will then be processed according to the program. Such as motion control, key control, speed, position, pressure sensing, etc.

[0075] As shown in Figure 15 The control circuit further comprises: a key circuit connected with the single-chip microcomputer, used for controlling the screen to rise, fall, emergency stop or return to the original position.

[0076] As shown in Figure 20 SW1-4 are on-board keys for debugging. KEY1 is a key interface that can select different appearance shape keys to access, instead of the function of on-board keys. Each key is connected to the single-chip microcomputer through a current limiting resistor, and the single-chip microcomputer defaults to output high level normally, and if the key is pressed, the corresponding IO port level will be pulled low.

[0077] As shown in Figure 15 The control circuit further comprises: an infrared sensor circuit connected with the single-chip microcomputer, used for detecting whether the screen returns to the original position. Figure 21 It is a schematic diagram of the infrared sensor circuit.

[0078] If the support needs to achieve millimeter-level position control of the screen in function, at least the position of the original point needs to be known, and then it is calculated and controlled. The utility model chooses an infrared pair tube, when the screen returns to the original position, it will block the infrared pair tube's light, and the infrared sensor gives a high level signal to the single-chip microcomputer through the current limiting resistor R24. In this way, the support knows that the device has been zeroed. In addition, R23 is a current limiting resistor for the power supply of the receiving tube, and R22 is a current limiting resistor for the transmitting tube.

[0079] As shown in Figure 15As shown, the control circuit further comprises: power circuit, motor drive circuit, electromagnetic lock control circuit, pressure sensor circuit, single-chip microcomputer, keying circuit and infrared sensor circuit are connected respectively, for motor drive circuit, electromagnetic lock control circuit, pressure sensor circuit, single-chip microcomputer, keying circuit and infrared sensor circuit power supply.

[0080] As Figure 22 As shown, 12V power supply is input through DC1, U3 is a bidirectional TVS tube of 26V (peak voltage fluctuation of vehicle-mounted 12V power supply), mainly used for bidirectional electrostatic protection. D1 is a reverse prevention diode, which prevents the circuit from being burned by reverse connection of power supply. Finally, after filtering through the capacitor voltage stabilizing, it is input to the stepper motor, power door lock, infrared pair tube and DCDC as power supply. DCDC further converts 12V to 3.3V through internal MOS tube chopping, L1 freewheeling, C3 and C4 wave stabilization, and then outputs to the single-chip microcomputer, keying circuit, pressure sensor circuit and the like.

[0081] It should be noted that for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0082] The principle and implementation mode of the specific examples in the present application are described, and the above embodiment is only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A vehicle-mounted screen, characterised in that, The screen support mechanism comprises a limiting structure and a support structure which is retractable in the vertical direction, one end of the support structure is connected with the shell, the other end is connected with the free end of the screen and moves in the vertical direction with the movement of the free end of the screen, and the limiting structure is used for fixing the length of the support structure. The support structure comprises a support frame which comprises at least two connecting rods, the ends of the two connecting rods are rotationally connected, one end of one of the connecting rods is rotationally connected with the shell, the other end of the other connecting rod is rotationally connected with a bottom plate, and the free end of the screen is connected with the bottom plate.

2. The vehicle-mounted screen according to claim 1, wherein The limiting structure comprises an electromagnetic lock, the end of the connecting rod rotationally connected with the inner side wall of the shell is provided with a tooth, the electromagnetic lock is provided with a lock tongue which is engaged with the tooth, the electromagnetic lock is arranged on one side of the support frame, and the retractable length of the support frame as a whole is controlled by the lock tongue.

3. The vehicle-mounted screen according to claim 2, wherein The screen driving mechanism is arranged on the same side of the support frame and the electromagnetic lock, the screen driving mechanism comprises a motor and a reel, one end of the screen is fixedly connected with the reel, and the motor is used for driving the reel to wind or unwind the screen.

4. The vehicle-mounted screen according to claim 3, wherein The screen driving mechanism further comprises a bearing support and a motor support, the bearing support and the motor support are arranged on the top surface of the shell, the motor is arranged on the motor support, the output shaft of the motor faces the bearing support, a connecting transmission shaft is arranged on the output shaft of the motor, the axis of the connecting transmission shaft coincides with the axis of the output shaft of the motor, a passive connecting shaft is arranged on the bearing support, the passive connecting shaft faces the motor support, the axis of the connecting transmission shaft coincides with the axis of the passive connecting shaft, and the two ends of the reel are respectively sleeved outside the motor, the connecting transmission shaft and the passive connecting shaft and are fixedly connected with the inner side wall of the reel through the passive connecting shaft and the connecting transmission shaft.

5. The vehicle-mounted screen according to claim 4, wherein The outer side surface of the reel is provided with a fixed surface which is recessed towards the axis of the reel, the length of the fixed surface in the axial direction of the reel is smaller than the length of the reel, the fixed surface is provided with a reel pressing strip for fixing the end of the screen on the reel, the reel pressing strip is embedded in the fixed surface, and the curvature of the side of the reel pressing strip away from the fixed surface is the same as the curvature of the reel.

6. The vehicle-mounted screen of claim 4, wherein, The end of the connecting transmission shaft away from the motor and the end of the passive connecting shaft away from the bearing support are both provided with a transmission plane, and the inner side wall of the reel is provided with a protruding step surface, the transmission plane abuts against the step surface.

7. The vehicle-mounted screen of claim 5, wherein, A first through hole is arranged on the transmission plane, a second through hole is arranged on the position of the outer side of the reel corresponding to the step surface, the second through hole penetrates the reel, the axis of the first through hole coincides with the axis of the second through hole, and a fixing pin is arranged in the first through hole and the second through hole.

8. The vehicle-mounted screen of claim 7, wherein, ​ 9. The vehicle-mounted screen of claim 4, wherein, The free end of the screen is provided with a stretch fixing strip, and the screen is fixedly connected with the bottom plate through the stretch fixing strip.

10. The vehicle-mounted screen of claim 9, wherein, The opposite side of the bottom plate connected with the connecting rod is provided with a pressure sensor, the pressure sensor is in a strip shape and is arranged along the length direction of the bottom plate, at least two groups of the pressure sensors are arranged along the width direction of the bottom plate, and the pressure sensors are electrically connected with the motor and the electromagnetic lock.

11. A control circuit for a vehicle-mounted screen, characterized by comprising: The control circuit is applied to the vehicle-mounted screen in any one of claims 1-10, and the control circuit comprises a motor driving circuit, an electromagnetic lock control circuit, a pressure sensor circuit and a single-chip microcomputer. The motor driving circuit is used for driving the motor to work, the electromagnetic lock control circuit is used for controlling the opening and closing of the electromagnetic lock, and the pressure sensor circuit is used for detecting the pressure generated on the bottom plate. The single-chip microcomputer is connected with the motor driving circuit, the electromagnetic lock control circuit and the pressure sensor circuit respectively, and is used for controlling the motor driving circuit, the electromagnetic lock control circuit and the pressure sensor circuit.

12. The control circuit for a vehicle-mounted screen according to claim 11, wherein The control circuit further comprises: A key circuit connected with the single-chip microcomputer and used for controlling the screen to ascend, descend, stop urgently or return to the original position.

13. The control circuit for a vehicle-mounted screen according to claim 12, wherein The control circuit further comprises: An infrared sensor circuit connected with the single-chip microcomputer and used for detecting whether the screen returns to the original position.

14. The control circuit for a vehicle-mounted screen according to claim 13, wherein The control circuit further comprises: A power supply circuit connected with the motor driving circuit, the electromagnetic lock control circuit, the pressure sensor circuit, the single-chip microcomputer, the key circuit and the infrared sensor circuit respectively and used for supplying power to the motor driving circuit, the electromagnetic lock control circuit, the pressure sensor circuit, the single-chip microcomputer, the key circuit and the infrared sensor circuit.

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