photoelectric sensor

Abstract

This invention provides a photoelectric sensor comprising a transmitter and a receiver. Both the transmitter and receiver include: a housing; a circuit board disposed inside the housing; and a cable electrically connected to the circuit board. The cable in the receiver is a four-core cable, one of which has a signal input core for switching between normally open and normally closed modes. This photoelectric sensor allows for rapid L / D switching by inputting a control signal through the four-core cable with the signal input core. It eliminates the need for adjustment knobs, sealing rings, rotary switches, and small substrates required for L / D switching in the original three-core cable configuration, effectively simplifying the sensor structure, reducing production costs and assembly time, and simultaneously improving the automation level of the photoelectric sensor.

Description

Technical Field

[0001] This utility model relates to the field of sensors, specifically to a photoelectric sensor. Background Technology

[0002] Photoelectric sensors detect the presence or absence of an object by utilizing the obstruction or reflection of light by the object being detected. When using photoelectric sensors, L / D switching may be required depending on the detection scenario and usage requirements. That is, switching between a normally open mode for outputting signals when an object is detected and a normally closed mode for outputting signals when no object is detected.

[0003] refer to Figure 1 Currently, existing photoelectric sensors typically use a three-core cable 101 with a positive electrode, a negative electrode, and a signal output electrode for electrical connection. L / D switching is achieved by turning an adjustment knob 102 with a screwdriver. The adjustment knob 102 is sealed with a sealing ring 103, making it difficult to guarantee that the sealing performance meets the IP67 standard. Furthermore, to cooperate with the adjustment knob 102, the photoelectric sensor also includes a small substrate 105 that is T-shaped and overlaps the main substrate. This small substrate 105 has a rotary switch 104 connected to the adjustment knob 102. The numerous components required for L / D switching result in high cost and complex assembly. Additionally, the T-shaped overlapping small substrate 105 is susceptible to external forces, which can cause the solder pads to detach, leading to poor contact and affecting the sensor's normal operation. Moreover, L / D switching requires manual operation by turning the adjustment knob 102, necessitating tools, making operation inconvenient, and resulting in complex assembly and low automation. Utility Model Content

[0004] To address the above problems, this utility model provides a light projector, a light receiver, and a photoelectric sensor. The photoelectric sensor can quickly perform L / D switching by inputting a control signal through a four-core cable with a signal input wire, eliminating the need for the adjustment knob, sealing ring, rotary switch, and small substrate required for L / D switching under the original three-core cable condition, effectively simplifying the sensor structure.

[0005] This utility model provides a light transmitter or light receiver for a photoelectric sensor, comprising: a housing;

[0006] The circuit board is located inside the housing;

[0007] The cable is electrically connected to the circuit board. The cable in the photodetector is a four-core cable, and the four-core cable has a signal input core for switching between normally open and normally closed modes.

[0008] According to the above technical solution, L / D switching can be quickly performed by inputting control signals through a four-core cable with signal input wires, which effectively simplifies the sensor structure, thereby reducing production costs and assembly time, while improving the automation level of photoelectric sensors.

[0009] Optionally, the projector or receiver may further include: a housing attached to the housing; and a mounting base disposed inside the housing and connected to both the housing and the housing.

[0010] Optionally, the housing, mounting base, and cover are all connected by a rubber seal.

[0011] According to the above technical solution, molding and sealing through rubber bonding can effectively ensure the sealing performance of the projector or receiver, so that the sealing level can reach IP67.

[0012] Optionally, the housing is also provided with a raised light guide cover, with the circuit board fixed on the mounting base and one end located in the raised light guide cover.

[0013] According to the above technical solution, only one circuit board is fixed inside the housing, eliminating the need for other small substrates. This avoids the problem of poor contact caused by external forces when small substrates are connected, which could affect the normal operation of the sensor.

[0014] Optionally, a light-emitting element is provided between the raised light guide cover and the mounting base, and the light-emitting element is connected to the circuit board.

[0015] Optionally, the housing is a square housing with an inclined surface located at one corner of the square housing. A hoop structure is provided at the inclined surface. The cable passes through the inclined surface and is connected to the circuit board by the hoop structure being tightly pressed by the external rubber sleeve and fixed by the rubber wrapping.

[0016] According to the above technical solution, the cable can enter the housing in a sealed manner, which further ensures the sealing performance.

[0017] Optionally, the mounting base also includes a lens, and the lens and the mounting base are connected by a sealed adhesive coating. The side of the circuit board facing the lens also includes a light-receiving component or a light-projecting component.

[0018] According to the above technical solution, the sealing between the lens and the mounting base can be effectively guaranteed by the glued connection. The light emitted by the projection component can be collimated by the lens, which effectively reduces light diffusion and ensures light quality. At the same time, the lens can focus the light onto the receiving component, ensuring detection accuracy and detection sensitivity.

[0019] This utility model also provides a photoelectric sensor, including a light receiver and a light transmitter as described above, or including a light transmitter and a light receiver as described above. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the cross-sectional structure of a light receiver that switches between L / D modes by adjusting a knob in the prior art;

[0021] Figure 2 A schematic diagram of the photoelectric sensor in the first embodiment of this utility model;

[0022] Figure 3 This is a cross-sectional structural diagram of the projector in the first embodiment of the present invention;

[0023] Figure 4 This is a cross-sectional structural diagram of the light receiver in the first embodiment of the present invention;

[0024] Figure 5 This is a cross-sectional structural diagram of the photoelectric sensor in the second embodiment of the present invention.

[0025] Reference numerals: 101 three-core cable, 102 adjustment knob, 103 sealing ring, 104 rotary switch, 105 small substrate, 100 photoelectric sensor. Projector 10, housing 11, hoop structure 111, circuit board 12, cable 13, cover 14, raised light guide 141, light-emitting element 142, mounting base 15, lens 151, projection assembly 152, light receiver 20, housing 21, hoop structure 211, circuit board 22, cable 23, cover 24, raised light guide 241, light-emitting element 242, mounting base 25, lens 251, light-receiving assembly 252, photoelectric sensor 200, housing 201, hoop structure 2011, circuit board 202, cable 203, cover 204, raised light guide 2041, light-emitting element 2042, mounting base 205, projection lens 2052, light-receiving lens 2051, projection assembly 207, light-receiving assembly 206. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] <First Implementation Method>

[0028] refer to Figure 2 In this embodiment, a photoelectric sensor 100 is a through-beam sensor, including a projector 10 and a receiver 20 arranged opposite to each other.

[0029] refer to Figure 3The projector 10 in this embodiment includes a housing 11, a circuit board 12, and a cable 13.

[0030] The circuit board 12 is housed inside the housing 11, and the cable 13 is electrically connected to the circuit board 12.

[0031] Specifically, the housing 11 is a square housing and has an inclined surface located at one corner of the square housing. A hoop structure 111 is provided on the inclined surface. The cable 13 passes through the inclined surface and is connected to the circuit board 12 by the hoop structure 111 tightly pressing the cable 13 with an external rubber sleeve and fixing it with rubber wrapping.

[0032] In this embodiment, the cable 13 of the projector 10 has at least a positive wire core and a negative wire core.

[0033] The projector 10 also includes a housing 14 and a mounting base 15. The housing 14 is connected to the housing 11, and the mounting base 15 is disposed inside the housing 11 and is connected to both the housing 11 and the housing 14.

[0034] In this embodiment, the two ends of the cover 14 are in contact with the housing 11 and the fixing seat 15 respectively and are connected by adhesive sealing. At the same time, the fixing seat 15 and the housing 11 are connected by adhesive sealing, which can effectively ensure the sealing performance.

[0035] The housing 14 is also provided with a raised light guide 141, and the circuit board 12 is fixed on the mounting base 15 with one end located in the raised light guide 141.

[0036] Specifically, the circuit board 12 is fixedly connected to the mounting base 15, with one end located on the raised light guide cover 141 and the other end located on the inclined side of the housing 11. Only one circuit board 12 is fixedly installed inside the housing 11, eliminating the need for other small substrates, which avoids poor contact caused by external forces when small substrates are overlapped.

[0037] The mounting base 15 also includes a lens 151, and the circuit board 12 facing the lens 151 also includes a light projection component 152. The light projection component 152 and the lens 151 have a light projection space, and the space is expanded along the direction from the light projection component 152 to the lens 151.

[0038] Specifically, the lens 151 and the outer surface of the mounting base 15 are sealed with adhesive to ensure sealing performance.

[0039] In this embodiment, the light emitted by the light projection component 152 is collimated and emitted after passing through the lens 151.

[0040] A light-emitting element 142 is also provided between the raised light guide cover 141 and the fixed base 15, and the light-emitting element 142 is connected to the circuit board 12.

[0041] Specifically, the mounting base 15 extends toward the circuit board 12 and is positioned below the raised light guide cover 141. The light-emitting element 142 is placed inside the raised light guide cover 141 and electrically connected to the circuit board 12. The light-emitting element 142, in cooperation with the raised light guide cover 141, can emit light outward to display the corresponding working information of the projector 10.

[0042] refer to Figure 4 In this embodiment, the light receiver 20 includes a housing 21, a circuit board 22, and a cable 23.

[0043] The circuit board 22 is housed inside the housing 21, and the cable 23 is electrically connected to the circuit board 22.

[0044] Specifically, the housing 21 is a square housing and has an inclined surface located at one corner of the square housing. A hoop structure 211 is provided on the inclined surface. The cable 23 passes through the inclined surface and is connected to the circuit board 22 by the hoop structure 211 tightly pressing the cable 23 with an external rubber sleeve and fixing it with rubber wrapping.

[0045] Specifically, the receiver 20 has a four-core cable 23, which includes a signal input core for switching between normally open and normally closed modes. Switching between normally open and normally closed modes can be directly performed by inputting a control signal through the four-core cable 23.

[0046] Furthermore, the cable 23 also has a positive and a negative wire core for power supply, as well as a signal output wire core for outputting a signal based on the object detection result.

[0047] The light receiver 20 also includes a housing 24 and a mounting base 25. The housing 24 is connected to the housing 21, and the mounting base 25 is disposed inside the housing 21 and is connected to both the housing 21 and the housing 24.

[0048] In this embodiment, the two ends of the cover 24 are in contact with the housing 21 and the fixing seat 25 respectively and are connected by adhesive sealing. At the same time, the fixing seat 25 and the housing 21 are connected by adhesive sealing, which can effectively ensure the sealing performance.

[0049] The housing 24 is also provided with a raised light guide 241, and the circuit board 22 is fixed on the mounting base 25 with one end located in the raised light guide 241.

[0050] Specifically, only one circuit board 22 is fixedly installed inside the housing 21. The circuit board 22 is fixedly connected to the mounting base 25, with one end located on the protruding light guide cover 241 and the other end located on the inclined side of the housing 21.

[0051] The mounting base 25 also includes a lens 251, and the side of the circuit board 22 facing the lens 251 also includes a light-receiving component 252. The light-receiving component 252 and the lens 251 have a light-receiving space, and the space is expanded along the direction from the light-receiving component 252 to the lens 251.

[0052] Specifically, the lens 251 and the outer surface of the mounting base 25 are bonded together with adhesive to ensure sealing performance.

[0053] In this embodiment, the light rays collimated by lens 151 will be focused by lens 251 onto light-receiving component 252.

[0054] A light-emitting element 242 is also provided between the raised light guide cover 241 and the fixed base 25, and the light-emitting element 242 is connected to the circuit board 22.

[0055] Specifically, the mounting base 25 extends toward the circuit board 22 and is positioned below the raised light guide cover 241. The light-emitting element 242 is placed inside the raised light guide cover 241 and electrically connected to the circuit board 22. The light-emitting element 242, in cooperation with the raised light guide cover 241, can emit light outward to display the corresponding working information of the light receiver 20.

[0056] In this embodiment, the projector 10 and the receiver 20 are positioned opposite each other to form a through-beam photoelectric sensor 100. The light emitted by the projector 152 is collimated by the lens 151 and then enters the oppositely positioned lens 251 and is focused onto the receiver 252 for reception. The presence of an object between the projector 10 and the receiver 20 can be detected by whether the light is blocked. Simultaneously, the receiver 20 can switch between normally open and normally closed modes by inputting a control signal through the signal input wire of the four-core cable 23 according to actual usage requirements, thereby outputting a signal when an object is detected or when no object is detected.

[0057] <Second Implementation Method>

[0058] According to the first embodiment of the light transmitter 10 and light receiver 20, since the light receiver 20 can perform L / D switching control by setting a four-core cable 23, the structure of the adjustment knob, sealing ring, rotary switch and small substrate is eliminated, and only the circuit board 22 is retained. Therefore, the light transmitter 10 and the light receiver 20 can also be combined to form a retroreflective or limited reflective sensor that integrates projection and reception.

[0059] refer to Figure 5 In this embodiment, the photoelectric sensor 200 is a reflective sensor that integrates projection and reception, including a housing 201, a circuit board 202, and a cable 203.

[0060] The circuit board 202 is housed inside the housing 201, and the cable 203 is electrically connected to the circuit board 202.

[0061] Specifically, the housing 201 is a square housing and has an inclined surface located at one corner of the square housing. A hoop structure 2011 is provided at the inclined surface. The cable 203 passes through the inclined surface and is connected to the circuit board 202 by the hoop structure 2011 tightly pressing the cable with an external rubber sleeve and fixing it with rubber wrapping.

[0062] In this embodiment, cable 203 is a four-core cable, which includes a signal input core for switching between normally open and normally closed modes. Switching between normally open and normally closed modes can be directly performed by inputting a control signal through the four-core cable 203.

[0063] Furthermore, the cable 203 also has a positive and a negative wire core for power supply, as well as a signal output wire core for outputting a signal based on the object detection result.

[0064] The photoelectric sensor 200 also includes a housing 204 and a mounting base 205.

[0065] The cover 204 is connected to the housing 201, and the fixing seat 205 is disposed inside the housing 201 and is connected to both the housing 201 and the cover 204.

[0066] In this embodiment, the two ends of the cover 204 are in contact with the housing 201 and the fixing seat 205 respectively and are connected by adhesive sealing. At the same time, the fixing seat 205 and the housing 201 are connected by adhesive sealing, which can effectively ensure the sealing performance.

[0067] The housing 204 is also provided with a raised light guide cover 2041, and the circuit board 202 is fixed on the mounting base 205 with one end located in the raised light guide cover 2041.

[0068] Specifically, the circuit board 202 is fixedly connected to the mounting base 205, with one end located on the raised light guide cover 2041 and the other end located on the inclined side of the housing 201. Only one circuit board 202 is fixedly installed inside the housing 201, eliminating the need for other small substrates. This avoids the possibility of poor contact caused by external forces when small substrates are overlapped.

[0069] Furthermore, a light-emitting component 207 and a light-receiving component 206 are spaced apart on the circuit board 202. The light-emitting component 207 and the light-receiving component 206 are arranged vertically and vertically by a fixing base 205. At the same time, a light-emitting lens 2052 is provided in the fixing base 205 corresponding to the light-emitting component 207, and a light-receiving lens 2051 is provided in the fixing base 205. The light-emitting component 207 and the light-emitting lens 2052 form an independent light-emitting space, and the light-receiving component 206 and the light-receiving lens 2051 form an independent light-receiving space. The light emitted by the light-emitting component 207 is emitted after passing through the light-emitting lens 2052, and after being reflected by an external object or a mirror, it is focused by the light-receiving lens 2051 onto the light-receiving component 206.

[0070] Specifically, the projection lens 2052 and the receiving lens 2051 are integrally formed and are sealed with adhesive to the outer surface of the mounting base 205, thereby ensuring sealing performance.

[0071] A light-emitting element 2042 is also provided between the raised light guide cover 2041 and the fixed base 205, and the light-emitting element 2042 is connected to the circuit board 202.

[0072] Specifically, the light-emitting element 2042 is placed inside the raised light guide cover 2041 and electrically connected to the circuit board 202. The light-emitting element 2042, in cooperation with the raised light guide cover 2041, can emit light to display the corresponding working information of the photoelectric sensor 200.

[0073] In this embodiment, by setting the light-emitting component 207 and the light-receiving component 206 on the same circuit board 202 to form a reflective photoelectric sensor 200 integrating light emission and reception, the sensor structure is effectively simplified, production costs are reduced, and assembly time is shortened. At the same time, the photoelectric sensor 200 can switch between normally open and normally closed modes by inputting control signals through the signal input wire core in the four-core cable 203 according to actual usage requirements, thereby outputting a signal when an object is detected or when no object is detected, thus improving the automation level of the photoelectric sensor.

[0074] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An optoelectronic sensor, comprising a light projector and a light receiver, characterized in that, Both the light projector and the light receiver include: A housing; A circuit board disposed inside the housing; A cable electrically connected to the circuit board, wherein the cable in the light receiver is a four-core cable, and the four-core cable has a signal input core for switching between the normally open mode and the normally closed mode, The photoelectric sensor further includes a cover connected to the housing; A fixing base disposed inside the housing and connected to both the housing and the cover, The cover further has a convex light guide cover, the circuit board is fixed on the fixing base and one end is located in the convex light guide cover, and the other end is located on the side of the inclined surface of the housing, A light emitting element is further provided between the convex light guide cover and the fixing base, and the light emitting element is placed inside the convex light guide cover and electrically connected to the circuit board.

2. The optoelectronic sensor according to claim 1, wherein The housing, the fixing base, and the cover are all connected by encapsulation and sealing.

3. The optoelectronic sensor according to claim 1, wherein, The housing is a square housing and has an inclined surface at one corner of the square housing, and a hoop structure is provided at the inclined surface, and the cable passes through the inclined surface and is connected to the circuit board in a manner that the outer rubber sleeve of the cable is tightly pressed by the hoop structure and fixed by encapsulation.

4. The optoelectronic sensor according to claim 1, wherein A lens is further provided in the fixing base, the lens and the fixing base are connected by encapsulation and sealing, and a light receiving component or a light projecting component is further provided on one side of the circuit board facing the lens.

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