An ultra-thin area light curtain sensor

Abstract

The application relates to the field of automatic detection sensors, in particular to an ultrathin area light curtain sensor which comprises a light projector, a light receiver and a warning mechanism, the light projector comprises a base, a circuit board, an infrared beam emitter, a rotating rod and an adjusting assembly, one end of the rotating rod is fixedly connected to the base, the other end of the rotating rod away from the base is rotationally connected to the circuit board, the adjusting assembly is used for driving the rotating rod to rotate, the circuit board is fixedly connected with the infrared beam emitter on the side away from the base, a Fresnel lens is fixedly connected to the side of the infrared beam emitter away from the base, infrared light beams emitted by the infrared beam emitter pass through the Fresnel lens and are output to infrared receiving photoelectric devices, the warning mechanism is electrically connected to the circuit board, and the warning mechanism is used for issuing a signal to warn a user. The application has the effect that the mounting frame can easily receive infrared light beams when being inclined, the effectiveness of the infrared light beams is guaranteed, and the application range of the light curtain sensor is increased.

Description

Technical Field

[0001] This application relates to the field of automated detection sensors, and in particular to an ultra-thin area light curtain sensor. Background Technology

[0002] Light curtain sensors are widely used in various fields. In industrial automated production, light curtain sensors detect the position and speed of objects moving on the production line, thereby ensuring that objects move along a predetermined path and sequence, thus achieving an efficient production process.

[0003] The light curtain sensor in the related technology includes a projector, a backlight, and a mounting frame. The projector includes a projector frame and several infrared beam emitters. The projector frame is fixedly connected to the mounting frame. The several infrared beam emitters are all fixedly connected to the projector frame and are used to emit infrared beams. The light receiver includes a light receiver frame and several infrared receiving photoelectric devices. The light receiver frame is fixedly connected to the mounting frame. The several infrared receiving photoelectric devices are all fixedly connected to the light receiver frame. The several infrared receiving photoelectric devices are arranged in parallel with the several infrared beam emitters. The several infrared receiving photoelectric devices are all used to receive the infrared beams emitted by the infrared beam emitters.

[0004] Regarding the aforementioned technologies, when one side of the mounting frame is tilted, the projection frame is tilted and fixed to the mounting frame, and the infrared beam emitter emits an infrared beam at an angle, making it difficult for the corresponding infrared receiving optoelectronic device to receive the infrared beam. Summary of the Invention

[0005] In order to make it easier for the mounting bracket to receive infrared beams when tilted, and to ensure the effectiveness of the infrared beam emission, thereby expanding the application range of the light curtain sensor, this application provides an ultra-thin area light curtain sensor.

[0006] The ultra-thin area light curtain sensor provided in this application adopts the following technical solution:

[0007] An ultra-thin area light curtain sensor includes a projector, a receiver, and an alarm mechanism. The projector includes a base, a circuit board, an infrared beam emitter, a rotating rod, and an adjustment assembly. One end of the rotating rod is rotatably connected to the base, and the other end of the rotating rod away from the base is rotatably connected to the circuit board. The adjustment assembly drives the circuit board to rotate. The infrared beam emitter is fixedly connected to the side of the circuit board away from the base, and a Fresnel lens is fixedly connected to the side of the infrared beam emitter away from the base. The infrared beam emitted by the infrared beam emitter passes through the Fresnel lens and is output to the receiver. The alarm mechanism is electrically connected to the circuit board and is used to issue a signal to warn the user.

[0008] By adopting the above technical solution, when one side of the mounting bracket is slightly tilted, the light receiver is installed in the designated position, and the base is fixedly connected to the tilted side of the mounting bracket. The infrared beam emitted by the infrared beam emitter is focused by the Fresnel lens. When the infrared beam emitted by the infrared beam emitter is tilted due to the tilt of the mounting bracket, the circuit board is driven to rotate around the rotating rod by the adjustment component, thereby fine-tuning the angle of the circuit board and adjusting the angle of the infrared beam emitted by the infrared beam emitter. This allows the infrared beam emitted by the infrared beam emitter to pass through the Fresnel lens and enter the infrared receiving optoelectronic device in parallel, which helps to ensure the effectiveness of the infrared beam emission and the reception of the infrared receiving optoelectronic device. This also makes it easier for the mounting bracket to receive the infrared beam when it is tilted, and helps to expand the installation range of the light curtain sensor.

[0009] Optionally, the adjustment assembly includes a low-speed motor, a lead screw, a rotating rod, and a sliding block. The low-speed motor is fixedly connected to the base, the lead screw is coaxially fixedly connected to the output end of the low-speed motor, the lead screw passes through the sliding block and is threaded into the sliding block, the base has a strip groove in the vertical direction, the sliding block slides into the strip groove, the sliding block is rotatably connected to the circuit board, one end of the rotating rod is rotatably connected to the base, and the other end of the rotating rod away from the base is rotatably connected to the circuit board.

[0010] By adopting the above technical solution, the low-speed motor drives the lead screw to rotate, thereby driving the sliding block to move along the direction of the strip groove, which in turn drives the circuit board to rotate. By controlling the emission angle of the infrared beam emitter on the circuit board, it is beneficial to ensure that the infrared receiving optoelectronic device can easily receive the infrared beam, thereby ensuring the effectiveness of the infrared beam emission and the applicability of the light curtain.

[0011] Optionally, the adjustment assembly further includes a limiting block, which is fixedly connected to the wall of the strip groove, and one end of the lead screw passes through the limiting block and is rotatably connected to the limiting block.

[0012] By adopting the above technical solution, the setting of the limiting block is beneficial to limiting the sliding block, which in turn is beneficial to limiting the adjustment angle of the circuit board, and helps to prevent the infrared beam emitted by the infrared beam emitter on the circuit board from being unable to be received by the infrared receiving optoelectronic device, thereby helping to ensure the effectiveness of the device.

[0013] Optionally, the projector further includes an irregularly shaped frame, which is used to help limit the angular movement range of the circuit board. The irregularly shaped frame includes a frame body, a recessed portion, a first bent portion, and a second bent portion. The frame body has a circular hole extending through it along the Y-axis, which is used for the infrared beam emitted by the infrared emitter. The first bent portion is formed by bending on one side of the frame body and abuts against one side of the circuit board in the width direction. The second bent portion is formed by bending on the other side of the frame body and abuts against the side of the circuit board width away from the first bent portion. The recessed portion is formed by bending on one side of the second bent portion, and the recessed portion is used to increase the space clearance of the projector.

[0014] By adopting the above technical solution, the frame body is provided with several circular holes corresponding to the infrared beam emitter. The infrared beam emitted by the infrared beam emitter is emitted through the circular holes and then passes through the Fresnel lens to enter the infrared receiving optoelectronic device, thereby ensuring the effectiveness of the device. The first and second bending parts are used together to restrict the horizontal movement of the circuit board, thereby limiting the horizontal movement of the circuit board. The setting of the recessed part is conducive to increasing the space for the projector, and the space component is conducive to the installation of other components.

[0015] Optionally, the irregular skeleton further includes a bending protrusion, which is formed by bending on one side of the recess. When the sliding block moves to the limit position of the lead screw, the recess abuts against the circuit board.

[0016] By adopting the above technical solution, the setting of the bending protrusion helps to limit the angular movement of the circuit board, thereby preventing the emitted infrared beam from failing to pass through the circular hole due to excessive angular movement of the circuit board, thus ensuring the effectiveness of the device.

[0017] Optionally, the frame body has several waist-shaped holes through it along the Z-axis, with the waist-shaped holes and round holes arranged alternately. Several protrusions are fixedly connected to one side of the Fresnel lens, and the protrusions are respectively inserted through the several waist-shaped holes.

[0018] By adopting the above technical solution, several protrusions are respectively inserted into the corresponding waist-shaped holes. The Fresnel lens is fixed to the frame body by inserting the protrusions into the waist-shaped holes, which is conducive to the positioning of the Fresnel lens and thus effectively ensures the intensity of the infrared beam.

[0019] Optionally, it also includes a housing, which is fixedly connected to the base. The housing has a material placement groove along the Z-axis, and the groove wall has a placement slot. The Fresnel lens is disposed in the placement slot, and a light-transmitting sheet for controlling the polarization direction of the infrared beam is fixedly connected to one side of the Fresnel lens. The light-transmitting sheet is disposed in the material placement groove.

[0020] By adopting the above technical solution, the material feeding tank and the placement tank respectively limit the Fresnel lens and the light-transmitting plate. The Fresnel lens is used to focus the infrared beam, and the light-transmitting plate is used to control the polarization direction of the infrared beam. This helps to ensure the effectiveness of the infrared beam emitted by the infrared beam emitter, and thus helps the infrared receiving optoelectronic device to receive the infrared beam.

[0021] Optionally, a number of limiting members are fixedly connected to the side of the outer shell near the irregular skeleton, and the limiting members are all inserted through the irregular skeleton.

[0022] By adopting the above technical solution and setting up several limiting components, the irregular frame is limited. The setting up of the irregular frame helps to ensure the strength of the device, avoid the device from being bumped, and help to protect and position the circuit board, thereby helping to ensure the effectiveness of the device.

[0023] Optionally, the outer casing has a through-hole for a placement slot, which communicates with the recessed portion. One side of the outer casing is provided with an opening and closing component for opening and closing the placement slot. The warning mechanism includes a light guide strip and a counter. The light guide strip is placed in the placement slot and is used to emit warning light. The light guide strip is located in the middle of the placement slot. The counter is fixedly connected to the recessed portion and is used for counting. Both the light guide strip and the counter are electrically connected to the circuit board.

[0024] By adopting the above technical solution, the opening and closing components are opened, and the light guide strip and counter are placed in the placement slot. When the infrared beam fails to be emitted to the side of the infrared receiving photoelectric device, the infrared receiving photoelectric device transmits relevant information to the circuit board. The light guide strip is located in the middle of the placement slot, and its relative position is conspicuous. The circuit board controls the light guide strip to flash to warn the staff, and the counter count increases, which helps to warn the staff and make them understand the applicable information of the equipment.

[0025] Optionally, the base has two arc-shaped protrusions along a diagonal direction, with a gap between the two arc-shaped protrusions for accommodating the circuit board.

[0026] By adopting the above technical solution, the circuit board is set in the gap, and the two arc-shaped protrusions are used together to accommodate the circuit board, which helps to fix the movement position of the circuit board in the X-axis direction, thus facilitating the positioning of the circuit board.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By adjusting the setup of the components, a low-speed motor drives the lead screw to rotate, which in turn moves the sliding block along the direction of the strip groove, thereby causing the circuit board to rotate. By controlling the emission angle of the infrared beam emitter on the circuit board, it is beneficial to ensure that the infrared receiving photoelectric device can easily receive the infrared beam, which in turn helps to ensure the effectiveness of the infrared beam emission and the applicable effect of the light curtain.

[0029] 2. The irregular frame is designed with several circular holes corresponding to the infrared beam emitter. The infrared beam emitted by the infrared beam emitter passes through the circular holes and then passes through the Fresnel lens to enter the infrared receiving optoelectronic device, thereby ensuring the effectiveness of the device. The first and second bends together are used to limit the horizontal movement of the circuit board, thereby limiting the horizontal movement of the circuit board. The recessed part helps to increase the space for the projector, and the space component facilitates the installation of other components. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the device according to an embodiment of this application.

[0031] Figure 2 This is an exploded structural diagram of the projector according to an embodiment of this application.

[0032] Figure 3 This is a schematic diagram of the structure of the base in an embodiment of this application.

[0033] Figure 4 This is a schematic diagram of the structure of the adjustment component in an embodiment of this application.

[0034] Figure 5 This is a schematic diagram of the structure of the adjustment component in an embodiment of this application.

[0035] Figure 6 This is a schematic diagram of the irregular skeleton structure in an embodiment of this application.

[0036] Figure 7 This is a schematic diagram of the Fresnel lens and light-transmitting sheet in an embodiment of this application.

[0037] Figure 8 This is a schematic diagram of the outer casing of an embodiment of this application.

[0038] Explanation of reference numerals in the attached drawings: 1. Projector; 2. Receiver; 3. Warning mechanism; 31. Light guide strip; 32. Counter; 4. Base; 41. Arc-shaped protrusion; 411. Mounting hole; 412. Hexagonal groove; 42. Sliding groove; 43. Positioning hole; 5. Circuit board; 6. Infrared beam emitter; 7. Irregularly shaped frame; 71. Bending protrusion; 72. Frame body; 721. Waist-shaped hole; 722. Round hole; 73. Recessed part; 731. Horizontal part; 732. Vertical part; 74. 741. First bend; 75. Second bend; 8. Adjustment assembly; 81. Low-speed motor; 82. Lead screw; 83. Sliding block; 84. Limiting block; 85. Rotating rod; 9. Limiting assembly; 91. Hex bolt; 92. Hex nut; 10. Fresnel lens; 11. Positioning component; 12. Light-transmitting sheet; 13. Outer shell; 131. Material trough; 132. Placement trough; 133. Limiting component; 134. Opening and closing component; 135. Placement cavity; 14. Spring. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0040] This application discloses an ultra-thin area light curtain sensor.

[0041] Reference Figure 1 An ultra-thin area light curtain sensor includes a projector 1, a light receiver 2, and an alarm mechanism 3.

[0042] Reference Figure 1 and Figure 2 The projector 1 includes a base 4, a circuit board 5, an infrared beam emitter 6, a rotating rod 85, an irregular frame 7, and an adjustment component 8. The base 4 is a cuboid. In this embodiment, the width direction of the base 4 is set as the X-axis direction, the length direction of the base 4 is set as the Y-axis direction, and the thickness direction of the base 4 is set as the Z-axis direction.

[0043] Reference Figure 2 and Figure 3Two arc-shaped protrusions 41 are provided on one side of the base 4. The two arc-shaped protrusions 41 are symmetrical along the axis and are symmetrically arranged at the center of each corner of the base 4. Both arc-shaped protrusions 41 have mounting holes 411 extending through them along the Z-axis. Hexagonal grooves 412 are formed on the side of the wall of each mounting hole 411 away from the circuit board 5. A limiting component 9 is provided on one side of the base 4 to facilitate fixed connection with the mounting bracket. The limiting component 9 includes a hexagonal bolt 91 and a hexagonal nut 92. The hexagonal bolt 91 passes through the mounting hole 411, and the hexagonal nut 92 is located in the hexagonal groove 412 and is threaded to the hexagonal bolt 91. The setting of the mounting hole 411 facilitates the limiting of the base 4 by the limiting component 133. When the hexagonal bolt 91 passes through the base 4 from the top, the hexagonal nut 92 is located in the hexagonal groove 412, and the thickness of the hexagonal nut 92 does not exceed the depth of the hexagonal groove 412. When the hex bolt 91 is inserted into the base 4 from the bottom, the bolt head of the hex bolt 91 is located in the hexagonal groove 412, and the thickness of the bolt head of the hex bolt 91 does not exceed the depth of the hexagonal groove 412. The hexagonal nut 92 is located at the top of the base 4. The establishment of the hexagonal groove 412 is conducive to fixing the base 4 in both directions, which is conducive to increasing the application range of the base 4.

[0044] Reference Figure 4 and Figure 5 One end of the rotating rod 85 is rotatably connected to the base 4, and the other end of the rotating rod 85 away from the base 4 is rotatably connected to the circuit board 5. Two sets of adjustment components 8 are provided, horizontally arranged along the X-axis of the circuit board 5. The adjustment components 8 are used to drive the circuit board 5 to rotate. The adjustment components 8 include a low-speed motor 81, a lead screw 82, a sliding block 83, and a limit block 84. The low-speed motor 81 is fixedly connected to the base 4. The lead screw 82 is coaxially fixedly connected to the output shaft of the low-speed motor 81. The lead screw 82 passes through the sliding block 83 and is threadedly connected to the sliding block 83. The sliding block 83 is rectangular. The base 4 has a sliding groove 42 along the Z-axis and is arranged along the Y-axis. The sliding groove 42 is rectangular in shape. The sliding block 83 passes through the sliding groove 83. The slide block 83 is rotatably connected to the circuit board 5, and the limiting block 84 is rectangular and fixedly connected to the wall of the slide groove 42. The lead screw 82 passes through the limiting block 84 and is rotatably connected to the limiting block 84. A spring 14 is fixedly connected to one end of the circuit board 5, and the end of the spring 14 away from the circuit board is fixedly connected to the base 4. The presence of the spring 14 helps to ensure the stability of the circuit board 5 connection, and thus helps to ensure the movement of the circuit board 5.

[0045] Reference Figure 4 and Figure 5When the low-speed motor 81 is working, the output shaft of the low-speed motor 81 rotates, thereby driving the lead screw 82 to rotate, which in turn drives the sliding block 83 to move along the sliding groove 42, thereby driving the circuit board 5 to rotate. The setting of the limit block 84 is beneficial to limit the position of the sliding block 83, which is beneficial to limit the rotation angle of the circuit board 5. When the low-speed motor 81 rotates, it drives the circuit board 5 to rotate to the designated position, which is beneficial to fine-tuning the orientation of the circuit board 5 when the mounting bracket is installed in an inclined state.

[0046] Reference Figure 3 and Figure 4 The base 4 has several positioning holes 43 through it, which are arranged in an array along the side of the base 4. The circuit board 5 is rectangular, and the arc-shaped protrusions 41 at the diagonal of the length of the circuit board 5 are arc-shaped. Several infrared beam emitters 6 are fixedly connected to the side of the circuit board 5 away from the base 4. The infrared beam emitters 6 are all electrically connected to the circuit board 5 and are evenly distributed along the Y-axis. The infrared beam emitters 6 are all used to emit infrared beams. In this embodiment, the number of infrared beam emitters 6 is eight. In this embodiment, the infrared beam emitters 6 are high-brightness infrared emitting LEDs, which helps to ensure the brightness of the infrared beam emitters 6 and thus the effectiveness of the emitted infrared beams.

[0047] Reference Figure 2 and Figure 6 The irregularly shaped frame 7 includes a bent protrusion 71, a frame body 72, a recess 73, a first bent portion 74, and a second bent portion 75. The frame body 72 is rectangular in shape and has several waist-shaped holes 721 vertically arranged along its length. In this embodiment, the number of waist-shaped holes 721 is nine. The frame body 72 also has round holes 722 along the Y-axis. The number of round holes 722 corresponds to the number of infrared beam emitters 6, which is eight. The round holes 722 and the waist-shaped holes 721 are arranged in a specific order. The infrared beam emitted by the infrared beam emitter 6 is arranged at intervals and passes through the circular hole 722. The first bending part 74 is formed by bending on one side of the frame 72. The first bending part 74 is arc-shaped and one end of the first bending part 74 abuts against the base plate. The first bending part 74 has a through hole 741. The through hole 741 is square in shape. In this embodiment, the number of through holes 741 is selected as four. The four through holes 741 are evenly arranged along the length direction of the first bending part 74. The orientation of the four through holes 741 corresponds to the positioning hole 43 on one side of the base 4.

[0048] Reference Figure 2 and Figure 6The second bend 75 is formed by bending on the side of the frame 72 away from the first bend 74. The second bend 75 is arc-shaped. Two through holes 741 are opened in the second bend 75 along the length direction corresponding to the positioning hole 43. The two through holes 741 are set at both ends of the second bend 75. The recess 73 is formed by bending on the second bend 75. The recess 73 includes a horizontal part 731 and a vertical part 732. The vertical part 732 is integrally fixed to the frame 72, and the horizontal part 731 is integrally fixed to the vertical part 732. The included angle between the vertical part 732 and the horizontal part 731 is selected as 90 degrees in this embodiment. One end of the horizontal part 731 is fixedly connected to the vertical part 732, and the end of the horizontal part 731 away from the vertical part 732 is fixedly connected to the second bend 75. The setting of the recess 73 is conducive to increasing space clearance, which is conducive to the installation of other components and to increasing the space arrangement of components.

[0049] Reference Figure 6 The bending protrusion 71 is formed on one side of the recess 73 by bending. When the sliding block 83 moves to the limit position of the lead screw 82, the circuit board 5 moves to the limit position, and the bending protrusion 71 abuts against the circuit board 5, thereby positioning the circuit board 5, which helps to ensure the effectiveness of the infrared beam emitted by the infrared beam emitter 6 on the circuit board 5.

[0050] Reference Figure 7 and Figure 8 A Fresnel lens 10 is provided on one side of the circuit board 5. The Fresnel lens 10 is used to focus the infrared beam. Several positioning members 11 are fixedly connected to one side of the Fresnel lens 10. In this embodiment, the positioning members 11 are made of rubber. The positioning members 11 are respectively inserted through the waist-shaped hole 721, which helps to limit the movement direction of the Fresnel lens 10, thereby still fixing the Fresnel lens 10. A light-transmitting sheet 12 is fixedly connected to the side of the Fresnel lens 10 away from the positioning members 11. The outer shell 13 has a material placement groove 13 along the Z-axis direction. 1. The material storage tank 131 is rectangular, and a placement groove 132 is opened in the material storage tank 131 along the Z-axis direction. The Fresnel lens 10 is placed in the placement groove 132, and the light-transmitting sheet 12 is placed in the material storage tank 131. The thickness of the Fresnel lens 10 does not exceed the groove depth of the placement groove 132, and the thickness of the light-transmitting sheet 12 does not exceed the groove depth of the material storage tank 131. The infrared beam passes through the Fresnel lens 10 and is emitted through the light-transmitting sheet 12, which is conducive to focusing the infrared beam and controlling the polarization direction of the infrared beam, thereby improving the effectiveness of the infrared beam.

[0051] Reference Figure 8The outer shell 13 is fixedly connected to a number of limiting members 133 on the side near the irregular frame 7. The limiting members 133 are all inserted through the through hole 741, which helps to restrict the movement of the irregular frame 7. The outer shell 13 has a through-hole 135, which is connected to the recess 73. The outer shell 13 is provided with an opening and closing member 134 for opening and closing the placement cavity 135. The opening and closing member 134 is arc-shaped. The warning mechanism 3 includes a light guide strip 31 and a counter 32. The light guide strip 31 is placed in the placement cavity 135 and is used to emit warning light. The light guide strip 31 is located in the middle of the placement cavity 135. In this embodiment, the length of the light guide strip 31 is selected as 102 mm * 10 mm. The counter 32 is fixedly connected to the recess 73 and is used for counting. When the infrared beam emitted by the infrared beam emitter 6 is received by the infrared receiving photoelectric device, the light guide strip 31 emits light to warn the staff. The counter 32 is used to record the status of the equipment once, which helps to review the use of the equipment and helps the staff understand the actual use status.

[0052] The implementation principle of an ultra-thin area light curtain sensor in this application embodiment is as follows: When the mounting bracket is slightly tilted, the projector 1 is tilted. The low-speed motor 81 rotates, which drives the lead screw 82 to rotate, causing the sliding block 83 to move to a designated position, thereby adjusting the angle of the circuit board 5. This helps to ensure that the infrared beam is emitted normally. The arc-shaped protrusion 41, the first bend 74, and the second bend 75 together restrict the movement of the circuit board 5 along the X-axis. The limiting block 84 and the bend protrusion 71 restrict the movement of the circuit board 5 in the angular direction, thereby limiting the position of the circuit board 5 and ensuring that the infrared beam is emitted normally. The infrared beam passes through the circular hole 722 and is emitted from one side of the Fresnel lens 10 and the light-transmitting sheet 12 to the infrared receiving photoelectric device. The device is then in normal use. When an object is located between the infrared beam emitter 6 and the infrared receiving photoelectric device, the infrared beam cannot reach the infrared receiving photoelectric device. In this case, the light guide strip 31 flashes to warn the staff, and the counter 32 counts automatically.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An ultra-thin area light curtain sensor, characterized in that: The device includes a projector (1), a receiver (2), and a warning mechanism (3). The projector (1) includes a base (4), a circuit board (5), an infrared beam emitter (6), a rotating rod (85), and an adjustment component (8). One end of the rotating rod (85) is rotatably connected to the base (4), and the other end of the rotating rod (85) away from the base (4) is rotatably connected to the circuit board (5). The adjustment component (8) is used to drive the circuit board (5) to rotate. The infrared beam emitter (6) is fixedly connected to the side of the circuit board (5) away from the base (4). A Fresnel lens (10) is provided on the side of the infrared beam emitter (6) away from the base (4). The infrared beam emitted by the infrared beam emitter (6) passes through the Fresnel lens (10) and is output to the receiver (2). The warning mechanism (3) is electrically connected to the circuit board (5) and is used to issue a signal to warn the user. The adjustment assembly (8) includes a low-speed motor (81), a lead screw (82), and a sliding block (83). The low-speed motor (81) is fixedly connected to the base (4). The lead screw (82) is coaxially fixedly connected to the output end of the low-speed motor (81). The lead screw (82) passes through the sliding block (83) and is threaded into the sliding block (83). The base (4) is provided with a sliding groove (42) along the Z-axis direction. The sliding block (83) is slidably engaged in the sliding groove (42). The sliding block (83) is rotatably connected to the circuit board (5). Several rotating rods (85) are provided. Several rotating rods (85) are used together to support the circuit board (5). The projector (1) also includes an irregularly shaped frame (7), which is used to help limit the angular movement range of the circuit board (5). The irregularly shaped frame (7) includes a frame body (72), a recess (73), a first bend (74), and a second bend (75). The frame body (72) has a circular hole (722) through it along the Y-axis. The circular hole (722) is used for the infrared beam emitted by the infrared emitter. The first bend (74) is used for the infrared beam emitted by the infrared emitter. The first bend (74) abuts against one side of the width direction of the circuit board (5), and the second bend (75) is formed on the other side of the frame (72) by bending. The second bend (75) abuts against the side of the circuit board (5) away from the first bend (74) in width. The recess (73) is formed on one side of the second bend (75) by bending. The recess (73) is used to increase the space for the projector (1).

2. The ultra-thin area light curtain sensor according to claim 1, characterized in that: The adjustment component (8) further includes a limiting block (84), which is fixedly connected to the wall of the sliding groove (42). One end of the lead screw (82) passes through the limiting block (84) and is rotatably connected to the limiting block (84).

3. The ultra-thin area light curtain sensor according to claim 1, characterized in that: The irregular skeleton (7) also includes a bending protrusion (71), which is formed by bending on one side of the recess (73). When the sliding block (83) moves to the limit position of the lead screw (82), the recess (73) abuts against the circuit board (5).

4. The ultra-thin area light curtain sensor according to claim 1, characterized in that: The frame (72) has several waist-shaped holes (721) through it along the Z-axis. The several waist-shaped holes (721) and the round holes (722) are arranged alternately. Several positioning members (11) are fixedly connected to one side of the Fresnel lens (10). The several positioning members (11) are respectively inserted through the several waist-shaped holes (721).

5. The ultra-thin area light curtain sensor according to claim 1, characterized in that: It also includes a housing (13), which is fixedly connected to the base (4). The housing (13) has a material placement groove (131) along the Z-axis. The material placement groove (131) has a placement slot (132) on its wall. The Fresnel lens (10) is placed in the placement slot (132). A light-transmitting sheet (12) for controlling the polarization direction of the infrared beam is fixedly connected to one side of the Fresnel lens (10). The light-transmitting sheet (12) is placed in the material placement groove (131).

6. The ultra-thin area light curtain sensor according to claim 5, characterized in that: The outer shell (13) is fixedly connected to a number of limiting members (133) on the side near the irregular frame (7), and the number of limiting members (133) are all inserted through the irregular frame (7).

7. The ultra-thin area light curtain sensor according to claim 5, characterized in that: The outer casing (13) has a through-hole groove (132) that communicates with the recess (73). The outer casing (13) has an opening and closing member (134) for opening and closing the groove (132) on one side. The warning mechanism (3) includes a light guide (31) and a counter (32). The light guide (31) is placed in the groove (132) and is used to emit warning light. The light guide (31) is located in the middle of the groove (132). The counter (32) is fixedly connected to the recess (73) and is used for counting. The light guide (31) and the counter (32) are both electrically connected to the circuit board (5).

8. The ultra-thin area light curtain sensor according to claim 1, characterized in that: The base (4) has two arc-shaped protrusions (41) arranged diagonally, and a gap is provided between the two arc-shaped protrusions (41) for accommodating the circuit board (5).

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