A slot-type photoelectric sensor

Abstract

The present application discloses a groove-type photoelectric sensor. The groove-type photoelectric sensor includes a transmitting unit, a reflecting unit, and a receiving unit. A first polarizer and a one-way light-transmitting mirror are disposed between the transmitting unit and the reflecting unit. The first polarizer is used to pass the optical signal in the first direction. The one-way light-transmitting mirror is obliquely disposed between the first polarizer and the reflecting unit. The light-transmitting surface of the one-way light-transmitting mirror is disposed close to the first polarizer, and the light-reflecting surface of the one-way light-transmitting mirror is disposed close to the reflecting unit. A second polarizer is disposed between the light-reflecting surface of the one-way light-transmitting mirror and the receiving unit. The second polarizer is used to pass the optical signal in the second direction. The reflecting unit is used to deflect the phase of the optical signal by a preset angle and reflect the optical signal, so that the deflected-phase optical signal is transmitted to the second polarizer through the light-reflecting surface of the one-way light-transmitting mirror. The present application can avoid the blind area of the groove-type photoelectric sensor during short-distance detection and effectively improve the detection accuracy at short distances.

Description

Technical Field

[0001] This application belongs to the technical field of sensors, and particularly relates to a groove-type photoelectric sensor. Background Art

[0002] A photoelectric sensor is a key component for realizing photoelectric conversion in various photoelectric detection systems. It usually includes a transmitting end and a receiving end. The receiving end receives the optical signal emitted by the transmitting end, and determines whether there is a target detection object between the transmitting end and the receiving end by detecting the intensity of the optical signal. According to the different propagation and reception paths of light, common photoelectric sensors can be divided into diffuse reflection photoelectric sensors, opposed photoelectric sensors, specular reflection photoelectric sensors, etc.

[0003] In the existing specular reflection photoelectric sensor, the transmitting end and the receiving end are arranged at two upper and lower positions, and there is a certain angle between the optical paths of emitting and receiving light, resulting in a blind area in short-distance detection. It cannot be used to detect objects at relatively short distances, and the missed detection rate is relatively high. Therefore, how to avoid the blind area of the groove-type photoelectric sensor in short-distance detection and improve the detection accuracy at short distances is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a groove-type photoelectric sensor, which can avoid the blind area of the groove-type photoelectric sensor in short-distance detection and improve the detection accuracy at short distances.

[0005] To solve the above technical problems, this application provides a groove-type photoelectric sensor, which includes a transmitting unit, a reflecting unit disposed opposite to the transmitting unit, and a receiving unit disposed on the same side as the transmitting unit;

[0006] A first polarizer and a one-way light-transmitting mirror are disposed between the transmitting unit and the reflecting unit. The first polarizer is used to pass the optical signal in the first direction. The one-way light-transmitting mirror is inclined and disposed between the first polarizer and the reflecting unit. The light-transmitting surface of the one-way light-transmitting mirror is close to the first polarizer, and the light-reflecting surface of the one-way light-transmitting mirror is close to the reflecting unit;

[0007] A second polarizer is disposed between the light-reflecting surface of the one-way light-transmitting mirror and the receiving unit. The second polarizer is used to pass the optical signal in the second direction. The reflecting unit is used to deflect the phase of the optical signal by a preset angle and reflect the optical signal, so that the deflected-phase optical signal is transmitted to the second polarizer through the light-reflecting surface of the one-way light-transmitting mirror;

[0008] Wherein, the angle formed by the first direction and the second direction is the preset angle.

[0009] As a further improvement of the present application, the transmitting unit is used to transmit the optical signal, and the optical signal is transmitted to the reflecting unit through the first polarizer and the light-transmitting surface of the one-way light-transmitting mirror in sequence;

[0010] The reflecting unit is used to deflect the phase of the optical signal by a preset angle and reflect the optical signal after the phase deflection. The optical signal after the preset angle deflection is transmitted to the second polarizer through the reflecting surface of the one-way light-transmitting mirror, so that the receiving unit receives the optical signal passing through the second polarizer.

[0011] As a further improvement of the present application, the groove-type photoelectric sensor further includes a main control unit, and the main control unit is connected to the transmitting unit and the receiving unit;

[0012] The receiving unit is used to convert the optical signal passing through the second polarizer into an electrical signal, and the main control unit is used to receive the electrical signal and judge whether there is a target detection object between the transmitting unit and the reflecting unit according to the electrical signal.

[0013] As a further improvement of the present application, the groove-type photoelectric sensor further includes an adjusting member for adjusting the light-emitting intensity of the optical signal. The adjusting member is connected to the light-emitting transistor of the transmitting unit, and the resistance value of the adjusting member connected to the transmitting unit is adjusted to adjust the driving current of the light-emitting transistor.

[0014] As a further improvement of the present application, the plane where the first polarizer is located is perpendicular to the plane where the second polarizer is located; the reflecting unit includes a reflecting prism, and the reflecting prism is used to deflect the phase of the optical signal by 90 degrees.

[0015] As a further improvement of the present application, a first inclination angle is formed between the plane where the first polarizer is located and the plane where the one-way light-transmitting mirror is located, and the first inclination angle is an acute angle.

[0016] As a further improvement of the present application, the groove-type photoelectric sensor further includes a groove-type housing. A first accommodation cavity and a second accommodation cavity opposite to the first accommodation cavity are arranged in the groove-type housing. The transmitting unit and the reflecting unit are respectively arranged in the first accommodation cavity and the second accommodation cavity, and the receiving unit is arranged on the same side as the transmitting unit;

[0017] A first light-transmitting hole is arranged on a side wall of the first accommodation cavity facing the second accommodation cavity. The transmitting unit faces the first light-transmitting hole, and the one-way light-transmitting mirror and the first polarizer are sequentially arranged between the first light-transmitting hole and the transmitting unit;

[0018] One side wall of the second accommodation cavity facing the first accommodation cavity is provided with a second light-transmitting hole, and the reflection unit is arranged facing the second light-transmitting hole.

[0019] As a further improvement of the present application, a first light-transmitting plate is arranged in the first light-transmitting hole, and a second light-transmitting plate is arranged in the second light-transmitting hole, so that the optical signal is transmitted to the reflection unit through the first light-transmitting plate and the second light-transmitting plate in sequence, and then transmitted to the receiving unit through the second light-transmitting plate and the first light-transmitting plate.

[0020] As a further improvement of the present application, a third accommodation cavity is further arranged in the trough-shaped housing, the adjusting member is a multi-turn potentiometer, an adjusting knob is arranged on the outer side wall of the trough-shaped housing, and the adjusting knob is connected to the multi-turn potentiometer arranged in the third accommodation cavity;

[0021] By rotating the adjusting knob, the resistance value of the multi-turn potentiometer connected to the transmitting unit is adjusted.

[0022] As a further improvement of the present application, a first indicator light and a second indicator light are further arranged in the trough-shaped housing;

[0023] The first indicator light is used to indicate whether the trough-shaped photoelectric sensor is normally powered;

[0024] The second indicator light is used to indicate whether there is a target detection object between the first light-transmitting hole and the second light-transmitting hole.

[0025] A trough-shaped photoelectric sensor provided by the present application has the following beneficial effects:

[0026] In the present application, the transmitting unit and the receiving unit are arranged on the same side, the reflection unit is arranged corresponding to the transmitting unit, a first polarizer and a one-way light-transmitting mirror are arranged between the transmitting unit and the reflection unit, the light-transmitting surface of the one-way light-transmitting mirror is arranged close to the first polarizer, so that the optical signal passing through the first polarizer enters the reflection unit through the light-transmitting surface of the one-way light-transmitting mirror, the reflection unit deflects the phase of the optical signal by a preset angle and reflects the optical signal, so that the optical signal after the phase deflection will be transmitted to the second polarizer through the reflecting surface of the one-way light-transmitting mirror. Since the first polarizer can pass the optical signal in the first direction, and the second polarizer can pass the optical signal in the second direction, and the angle formed between the first direction and the second direction is the preset angle, it is ensured that the optical signal deflected by the preset angle by the reflection unit can smoothly pass through the second polarizer and enter the receiving unit; in the present application, the multi-turn potentiometer is used to precisely adjust the light-emitting intensity of the optical signal, and the optical paths of transmission and reception are on the same straight line without an angle, so that the occurrence of blind spots leading to missed detection can be avoided, and the precise detection of short-distance transparent objects can be effectively realized. Description of the Drawings

[0027] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only a part of the embodiments of the present application, rather than all the embodiments. For those of ordinary skill in the art, without creative efforts, other accompanying drawings obtained based on these drawings all fall within the scope of protection of the present application.

[0028] Figure 1 Structural schematic diagram of the groove-type photoelectric sensor provided by the embodiment of the present application;

[0029] Figure 2 Structural schematic diagram of the groove-type housing in the groove-type photoelectric sensor provided by the embodiment of the present application;

[0030] Figure 3 Structural schematic diagram of the optical signal in the groove-type photoelectric sensor provided by the embodiment of the present application;

[0031] Figure 4 Schematic diagram of the implementation principle of the groove-type photoelectric sensor provided by the present application;

[0032] Figure 5 Functional module diagram of the groove-type photoelectric sensor provided by the embodiment of the present application;

[0033] Figure 6 Circuit schematic diagram of the transmitting unit in the groove-type photoelectric sensor provided by the embodiment of the present application;

[0034] Figure 7 Circuit schematic diagram of the receiving unit in the groove-type photoelectric sensor provided by the embodiment of the present application;

[0035] Figure 8 Circuit schematic diagram of the power supply unit in the groove-type photoelectric sensor provided by the embodiment of the present application;

[0036] Figure 9 Circuit schematic diagram of the output protection unit in the groove-type photoelectric sensor provided by the embodiment of the present application;

[0037] Figure 10 Circuit schematic diagram of the conversion unit in the groove-type photoelectric sensor provided by the embodiment of the present application;

[0038] Figure 11 Circuit schematic diagram of the indicating unit in the groove-type photoelectric sensor provided by the embodiment of the present application;

[0039] Figure 12 Circuit schematic diagram of the main control unit in the groove-type photoelectric sensor provided by the embodiment of the present application;

[0040] Explanation of reference numerals:

[0041] 1 - Groove-shaped housing; 10 - Mounting hole; 11 - First accommodation cavity; 12 - Second accommodation cavity; 13 - Third accommodation cavity; 14 - Adjusting knob; 15 - Locking bolt; 16 - First indicator light; 17 - Second indicator light; 18 - Wire outlet sleeve; 19 - Power cord;

[0042] 2 - Transmitting unit; 21 - Light-emitting transistor; 22 - First polarizer; 23 - One-way light-transmitting mirror; 24 - First light-transmitting plate;

[0043] 3 - Reflecting unit; 31 - Reflecting prism; 32 - Second light-transmitting plate;

[0044] 4 - Receiving unit; 41 - Second polarizer; 42 - PD receiving tube. Detailed implementation manner

[0045] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0046] In order to make the description of the present disclosure more detailed and complete, the following provides an illustrative description of the implementation manners and specific embodiments of the present application; however, this is not the only form for implementing or applying the specific embodiments of the present application. The implementation manners cover the features of multiple specific embodiments and the method steps and their sequences for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0047] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order different from those illustrated or described here.

[0048] In the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B. The "and / or" in the text is merely a description of the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two. Similar understanding should be applied to other quantifiers. The preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application. And without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0049] Please refer to Figures 1-12 , the present application provides a groove-shaped photoelectric sensor, which can avoid the blind area of the groove-shaped photoelectric sensor during short-distance detection and effectively improve the detection accuracy at short distances. Please refer to Figure 1 , which is a schematic structural diagram of a groove-shaped photoelectric sensor provided by an embodiment of the present application. The groove-shaped photoelectric sensor includes a transmitting unit 2, a receiving unit 4, a reflecting unit 3, and a main control unit.

[0050] As an optional implementation manner, please refer to Figure 4 , which is a schematic diagram of the implementation principle of the groove-shaped photoelectric sensor provided by the present application. In the present application, the transmitting unit 2 and the reflecting unit 3 are arranged opposite to each other, and the transmitting unit 2 is arranged on the same side as the receiving unit 4. The transmitting unit 2 emits an optical signal, and the reflecting unit 3 reflects the optical signal so that the reflected optical signal enters the receiving unit 4. Then, the receiving unit 4 converts the optical signal into an electrical signal. At this time, the main control unit determines whether there is a target detection object between the transmitting unit 2 and the reflecting unit 3 according to the received electrical signal.

[0051] Specifically, a first polarizer 22 and a one-way light-transmitting mirror 23 are arranged between the transmitting unit 2 and the reflecting unit 3. Since the first polarizer 22 can pass the optical signal in the first direction and only the optical signal with the same specific direction as the first polarizer 22 can pass, the optical signal emitted by the transmitting unit 2 can be converted into polarized light by the first polarizer 22, and the optical signal enters the one-way light-transmitting mirror 23 after being converted into polarized light.

[0052] Please refer to Figure 3 , which is a schematic structural diagram of the optical signal in the groove-shaped photoelectric sensor provided by an embodiment of the present application. It can be observed that the optical signal emitted by the transmitting unit 2 is non-polarized light. Since the essence of light is an electromagnetic wave with electric and magnetic field vibrations, when the optical signal has not passed through the first polarizer 22, light vibrations in all directions exist. When this vibration occurs in a specific direction, it becomes polarized light. Therefore, the present application sets the first polarizer 22 to pass the optical signal in the first direction, so that the optical signal passing through the first polarizer 22 becomes polarized light.

[0053] Further, it can be observed that a grating is provided on the first polarizer 22, and only the optical signal that can pass through the grating is allowed to pass through, and optical signals at any other angles cannot pass through. Therefore, the optical signal passing through the grating is polarized light vibrating in the first direction.

[0054] In the embodiment of the present application, the one-way light-transmitting mirror 23 should be inclined and arranged between the first polarizer 22 and the reflection unit 3. It can be observed that a first inclination angle is formed between the plane where the first polarizer 22 is located and the plane where the one-way light-transmitting mirror 23 is located. Preferably, the first inclination angle is set to an acute angle, and the light-transmitting surface of the one-way light-transmitting mirror 23 is arranged close to the first polarizer 22, so that the optical signal passing through the first polarizer 22 enters the reflection unit 3 through the light-transmitting surface of the one-way light-transmitting mirror 23.

[0055] Further, the reflective surface of the one-way light-transmitting mirror 23 is arranged close to the reflection unit 3, so that the optical signal reflected by the reflection unit 3 is transmitted to the second polarizer 41 through the reflective surface of the one-way light-transmitting mirror 23.

[0056] It can be understood that in the present application, the light-transmitting surface of the one-way light-transmitting mirror 23 is arranged close to the first polarizer 22, and the reflective surface of the one-way light-transmitting mirror 23 is arranged close to the reflection unit 3, so that the optical signal passing through the first polarizer 22 enters the reflection unit 3 through the light-transmitting surface of the one-way light-transmitting mirror 23, and the optical signal reflected by the reflection unit 3 is transmitted to the second polarizer 41 through the reflective surface of the one-way light-transmitting mirror 23, and thus enters the receiving unit 4 through the second polarizer 41.

[0057] It should be noted that the principle of the one-way light-transmitting mirror 23 is to coat one side surface of the lens, so that the optical signal transmitted from the transmitting unit 2 to the reflection unit 3 passes through the one-way light-transmitting mirror 23, and the optical signal reflected by the reflection unit 3 to the transmitting unit 2 is reflected to the receiving unit 4. The above can be achieved through the existing structure of the one-way light-transmitting mirror 23, and the present application does not further limit the specific selection of the one-way light-transmitting mirror 23.

[0058] After the optical signal is transmitted to the reflection unit 3 through the one-way light-transmitting mirror 23, the reflection unit 3 deflects the phase of the optical signal by a preset angle and reflects the optical signal. Since the second polarizer 41 is arranged between the reflective surface of the one-way light-transmitting mirror 23 and the receiving unit 4 in the present application, the optical signal with the deflected phase will pass through the reflective surface of the one-way light-transmitting mirror 23 and be transmitted to the second polarizer 41.

[0059] Furthermore, the above-mentioned second polarizer 41 can only transmit optical signals in the second direction. Therefore, only the optical signals with the same specific direction as the grating in the second polarizer 41 can pass through. The angle formed between the first direction and the second direction is equal to the preset angle. Therefore, the optical signals deflected by the preset angle by the reflection unit 3 can smoothly pass through the second polarizer 41 and enter the receiving unit 4.

[0060] In the grooved photoelectric sensor provided by the present application, the optical signals emitted by the transmitting unit 2 and the optical signals reflected by the reflecting unit 3 will both pass through the one-way light-transmitting mirror 23, so that the optical paths of transmission and reception are on the same straight line and there is no angle, effectively avoiding the occurrence of missed detection due to blind spots.

[0061] It can be understood that a grating (not shown in the figure) is also provided on the second polarizer 41. The grating matches the vibration direction of the optical signals deflected by the preset angle by the reflection unit 3 and is used to transmit optical signals in the second direction, so that the optical signals matching the second direction can pass through the second polarizer 41 and enter the receiving unit 4. Of course, in practical applications, the positions and angles of the first polarizer 22 and the second polarizer 41 can be adjusted accordingly, and the present application does not make further restrictions on this.

[0062] As an optional implementation manner, a reflecting prism 31 is provided in the above-mentioned reflection unit 3, and the deflection of the phase of the optical signal can be realized through the reflecting prism 31.

[0063] In the embodiment of the present application, the optical signals directly emitted by the transmitting unit 2, the optical signals passing through the first polarizer 22, and the optical signals passing through the second polarizer 41 are all transverse waves, and the vibration direction of the optical signals is perpendicular to the light transmission direction.

[0064] Preferably, in the present application, the first polarizer 22 is disposed at the light outlet of the light-emitting transistor 21, and the second polarizer 41 is disposed at the light inlet of the receiving unit 4. Since the reflecting prism 31 can deflect the phase of the optical signal passing through the first polarizer 22 by a preset angle, and the angle formed between the first direction and the second direction is the same as the preset angle, the optical signal after deflecting the phase can pass through the second polarizer 41 and enter the receiving unit 4.

[0065] In a specific embodiment provided by the present application, the first polarizer 22 can be vertically disposed at the light outlet of the light-emitting transistor 21, the second polarizer 41 can be horizontally disposed at the light inlet of the receiving unit 4, and the reflecting prism 31 can be disposed parallel to the first polarizer 22, so as to reflect the optical signals emitted by the transmitting unit 2 to the greatest extent. Since the plane where the first polarizer 22 is located is perpendicular to the plane where the second polarizer 41 is located, the reflecting prism 31 can be set as a 90° reflecting prism, so as to deflect the phase of the optical signal by 90 degrees.

[0066] Of course, the present application does not further limit the specific selection of the above-mentioned reflection prism 31. In principle, it is sufficient to satisfy deflecting the phase of the optical signal by a preset angle and reflecting the optical signal so that the deflected optical signal is transmitted to the second polarizer 41 through the reflecting surface of the one-way light-transmitting mirror 23. Those skilled in the art should be aware of this.

[0067] Further, it is preferably to set the acute angle formed between the one-way light-transmitting mirror 23 and the first polarizer 22 to 45°, and also set the included angle formed between the one-way light-transmitting mirror 23 and the second polarizer 41 to 45°. Since the reflection prism 31 is arranged parallel to the first polarizer 22, and the plane where the first polarizer 22 is located is perpendicular to the plane where the second polarizer 41 is located, the optical signal emitted by the emitting unit 2 can be reflected to the greatest extent, ensuring that the optical paths of emission and reception are on the same straight line and there is no angle, effectively avoiding the occurrence of blind spots.

[0068] Of course, the included angles formed between the above-mentioned first polarizer 22, one-way light-transmitting mirror 23, second polarizer 41 and reflection prism 31 can also be adjusted according to actual needs. In principle, it is sufficient to satisfy that the optical paths of emission and reception are on the same straight line and there is no angle. The present application does not impose any restrictions on this.

[0069] In the embodiment of the present application, an optical signal is emitted by the light-emitting transistor 21 in the emitting unit 2. The optical signal is sequentially transmitted to the reflection unit 3 through the light-transmitting surfaces of the first polarizer 22 and the one-way light-transmitting mirror 23. The reflection unit 3 deflects the phase of the optical signal by a preset angle and reflects the deflected optical signal, so that the deflected optical signal is transmitted to the second polarizer 41 through the reflecting surface of the one-way light-transmitting mirror 23, and then the optical signal passing through the second polarizer 41 is received by the receiving unit 4.

[0070] As an alternative implementation manner, the main control unit can be connected to the above-mentioned emitting unit 2, receiving unit 4 and reflection unit 3 in a wired and / or wireless manner. When the receiving unit 4 receives the optical signal passing through the second polarizer 41, the optical signal will be converted into an electrical signal, and then the main control unit determines whether there is a target detection object between the emitting unit 2 and the reflection unit 3 according to the received electrical signal.

[0071] As an alternative implementation manner, the present application can detect whether there is a transparent object between the emitting unit 2 and the reflection unit 3 through the above-mentioned grooved photoelectric sensor. Since the medium of the transparent object is different, the optical signal will be refracted when passing through the transparent object, resulting in a change in the intensity of the optical signal received by the receiving unit 4. The main control unit compares the magnitude of the electrical signal converted from the optical signal with a preset threshold to determine whether there is a transparent object between the emitting unit 2 and the reflection unit 3.

[0072] Exemplarily, it can be set that when the electrical signal is greater than or equal to a preset threshold, it is determined that there is no transparent object between the transmitting unit 2 and the reflecting unit 3, and when the electrical signal is less than the preset threshold, it is determined that there is a transparent object between the transmitting unit 2 and the reflecting unit 3. By comparing the magnitude of the electrical signal converted from the optical signal with the preset threshold, it is thus determined whether there is a transparent object between the transmitting unit 2 and the reflecting unit 3.

[0073] It can be understood that since the media of different transparent objects are different, the transmission speed and deflection degree of the optical signal in the transparent object are different, resulting in different degrees of change in the intensity of the optical signal received by the receiving unit 4. And the grooved photoelectric sensor provided in the present application is provided with an adjusting member for adjusting the light-emitting intensity of the optical signal. The adjusting member is connected to the light-emitting transistor 21 of the transmitting unit 2. By adjusting the resistance value of the adjusting member connected to the transmitting unit 2, the driving current of the light-emitting transistor 21 can be adjusted, and further the adjustment of the light-emitting intensity of the optical signal can be realized.

[0074] Furthermore, according to transparent objects of different media, the light-emitting intensity of the optical signal can be adjusted by the adjusting member, so that the receiving unit 4 can receive the optical signal and compare it with the preset threshold. Therefore, the present application does not further limit the specific resistance value of the adjusting member connected to the transmitting unit 2 and the actual light-emitting intensity of the optical signal. Those skilled in the art can make adaptive adjustments according to actual detection requirements.

[0075] In the related art, the photoelectric sensor usually adjusts the amplification factor of the receiving end to realize the adjustment of the induction distance. However, this method has very poor adjustment accuracy for the optical signal, cannot perform precise testing at a very short distance, and cannot perform precise testing on transparent objects at a short distance.

[0076] In the embodiment of the present application, by changing the resistance value of the adjusting member connected to the transmitting unit 2, the precise adjustment of the light-emitting intensity of the optical signal is realized, and the optical paths of transmission and reception are on the same straight line and there is no angle, and there is no blind area for detecting objects at a short distance, and the precise detection of transparent objects at a short distance can be realized.

[0077] As an optional implementation manner, please refer to Figure 2 , which is a schematic structural diagram of the grooved housing of the grooved photoelectric sensor provided in the embodiment of the present application. The present application also provides a grooved housing 1 capable of accommodating the above-mentioned transmitting unit 2, receiving unit 4, reflecting unit 3, main control unit and adjusting member. Preferably, the grooved housing 1 is set as a U-shaped housing. Similarly, the transmitting unit 2 and the receiving unit 4 are arranged on the same side, and the reflecting unit 3 is arranged corresponding to the transmitting unit 2.

[0078] It can be observed that a first accommodation cavity 11 and a second accommodation cavity 12 corresponding to the first accommodation cavity 11 are provided in the trough-shaped housing 1. In this application, the transmitting unit 2 and the reflecting unit 3 are respectively arranged in the first accommodation cavity 11 and the second accommodation cavity 12, and the receiving unit 4 and the transmitting unit 2 are arranged on the same side.

[0079] In actual tests, the target detection object needs to be arranged between the first accommodation cavity 11 and the second accommodation cavity 12, that is, in the groove formed by the trough-shaped housing 1. At this time, the target detection object is located between the transmitting unit 2 and the reflecting unit 3.

[0080] Further, taking the case where the transmitting unit 2 and the receiving unit 4 are arranged in the first accommodation cavity 11 and the reflecting unit 3 is arranged in the second accommodation cavity 12 as an example for illustration, in this application, a first light-transmitting hole is provided on the side wall of the first accommodation cavity 11 facing the second accommodation cavity 12, and the transmitting unit 2 is arranged facing the first light-transmitting hole to ensure that the light signal emitted by the transmitting unit 2 is transmitted from the first light-transmitting hole to the reflecting unit 3.

[0081] Similarly, in this application, a second light-transmitting hole is provided on the side wall of the second accommodation cavity 12 facing the first accommodation cavity 11, and the reflecting prism 31 of the reflecting unit 3 is arranged facing the second light-transmitting hole to ensure that the light signal is transmitted to the reflecting prism 31 after passing through the first light-transmitting hole and the second light-transmitting hole.

[0082] It can be understood that the light signal emitted by the transmitting unit 2 is transmitted to the reflecting prism 31 through the first light-transmitting hole and the second light-transmitting hole in sequence. Therefore, in principle, the light-emitting transistor 21 of the transmitting unit 2, the first light-transmitting hole, the second light-transmitting hole, and the reflecting prism 31 should be arranged on the same horizontal line to avoid abnormal transmission of the light signal.

[0083] It should be noted that the above first light-transmitting hole and second light-transmitting hole do not mean that the light-transmitting hole is a circular hole structure. Substantially, the light-transmitting hole can also be set as a strip structure, a rectangular structure, etc., as long as the size of the hole structure can pass the light signal between the transmitting unit 2 and the receiving unit 4 and avoid the light signal being blocked by the outer side wall of the trough-shaped housing 1 during transmission.

[0084] Further, after determining the positions of the light-emitting transistor 21, the first light-transmitting hole, the second light-transmitting hole, and the reflecting prism 31, the one-way light-transmitting mirror 23 and the first polarizing sheet 22 are sequentially arranged between the first light-transmitting hole and the transmitting unit 2, and a required first inclination angle is formed between the one-way light-transmitting mirror 23 and the first polarizing sheet 22. In this application, the selection value of the above first inclination angle and the setting position of the one-way light-transmitting mirror 23 are not further elaborated.

[0085] At this time, the optical signal emitted by the transmitting unit 2 sequentially passes through the first polarizer 22, the one-way light-transmitting mirror 23, the first light-transmitting hole, and the second light-transmitting hole and enters the reflecting unit 3. The reflecting unit 3 deflects the phase of the optical signal and reflects it. The phase-deflected optical signal passes through the second light-transmitting hole, the first light-transmitting hole, the one-way light-transmitting mirror 23, and the second polarizer 41 and enters the receiving unit 4. Then, the receiving unit 4 converts the optical signal into an electrical signal for the main control unit to determine whether there is a target detection object between the first light-transmitting hole and the second light-transmitting hole.

[0086] Preferably, a certain distance should be reserved between the second polarizer 41 and the one-way light-transmitting mirror 23, and it is only necessary to ensure that the transmitting unit 2 and the receiving unit 4 are both arranged in the first accommodation cavity 11 or both arranged in the second accommodation cavity 12. The present application does not make further restrictions on this.

[0087] As an alternative embodiment, in order to ensure the sealing performance of the trough-shaped housing 1 and prevent damage to each component in the trough-shaped housing 1, the present application provides a first light-transmitting plate 24 in the first light-transmitting hole and a second light-transmitting plate 32 correspondingly arranged in the second light-transmitting hole. The light-transmitting member should satisfy the light-transmitting characteristic to realize the transmission of the optical signal.

[0088] Exemplarily, the first light-transmitting plate 24 and the second light-transmitting plate 32 can be set in the form of transparent acrylic plates. At this time, the optical signal will be transmitted from the one-way light-transmitting mirror 23 to the reflecting unit 3 sequentially through the first light-transmitting plate 24 and the second light-transmitting plate 32, and then transmitted from the reflecting unit 3 to the receiving unit 4 sequentially through the second light-transmitting plate 32 and the first light-transmitting plate 24.

[0089] Certainly, the first light-transmitting plate 24 and the second light-transmitting plate 32 can also be set in the form of lenses to diverge or converge the optical signal according to actual needs. The above setting methods are all feasible. In principle, it is only necessary to ensure that the first light-transmitting plate 24 and the second light-transmitting plate 32 have light-transmitting characteristics. The present application does not make further restrictions on the specific setting forms of the first light-transmitting plate 24 and the second light-transmitting plate 32.

[0090] Furthermore, the present application also provides a third accommodation cavity 13 in the trough-shaped housing 1. The third accommodation cavity 13 can be communicated with the first accommodation cavity 11 and the second accommodation cavity 12, or can be independently arranged. The present application arranges the main control unit and the adjusting member in the third accommodation cavity 13.

[0091] In a specific embodiment provided by the present application, the adjusting member can be set in the form of a multi-turn potentiometer. An adjusting knob 14 is arranged on the outer side wall of the trough-shaped housing 1. The adjusting knob 14 is connected to the multi-turn potentiometer arranged inside the third accommodation cavity 13. By rotating the adjusting knob 14, the resistance value of the multi-turn potentiometer connected to the transmitting unit 2 is adjusted, so as to realize the adjustment of the light-emitting intensity of the optical signal.

[0092] Preferably, except for the first light-transmitting plate 24 and the second light-transmitting plate 32, the surface of the groove-shaped housing 1 provided in this application is sprayed with black paint. Preferably, the groove-shaped housing 1 is set as an aluminum alloy housing, which is formed by locking the upper and lower parts through a plurality of locking bolts 15. When the internal components of the groove-shaped photoelectric sensor are abnormal, the groove-shaped housing 1 can be disassembled to facilitate the repair and replacement of the internal components.

[0093] As an alternative embodiment, this application also provides a first indicator light 16 and a second indicator light 17 in the groove-shaped housing 1. Transparent lamp covers are provided on the outer side wall of the groove-shaped housing 1 corresponding to the positions of the first indicator light 16 and the second indicator light 17. Users can observe whether the first indicator light 16 or the second indicator light 17 is in a lit state through the transparent lamp covers, so as to know the current test state in time.

[0094] Exemplarily, the first indicator light 16 and the second indicator light 17 can be set as indicator lights of different colors, and different test states are indicated by the first indicator light 16 and the second indicator light 17. For example, the first indicator light 16 is set to indicate whether the groove-shaped photoelectric sensor is normally powered, and the second indicator light 17 is set to indicate whether there is a target detection object between the first light-transmitting hole and the second light-transmitting hole. Of course, a third indicator light, a fourth indicator light, etc. can also be added according to requirements. This application does not further limit the number of the above-mentioned indicator lights and the specific test states they indicate.

[0095] Furthermore, this application also provides a power cord 19 for powering the groove-shaped photoelectric sensor. In order to avoid bending and wear of the power cord 19, this application provides an outlet sleeve 18 at the connection position of the power cord 19 and the groove-shaped photoelectric sensor. When the external power supply charges the groove-shaped photoelectric sensor through the power cord 19, the first indicator light 16 will emit light normally.

[0096] Preferably, this application also provides a mounting hole 10 on the groove-shaped housing 1, which facilitates the staff to fix the groove-shaped photoelectric sensor at different spatial positions according to the detection requirements during the actual detection process, meeting the requirements of convenient installation and flexible adjustment of the detection position.

[0097] In the embodiment of this application, by providing the first polarizing plate 22, the second polarizing plate 41 and the reflecting prism 31, the anti-interference ability of the product is greatly improved, and the requirements for the use environment are extremely low, enabling the groove-shaped photoelectric sensor to be used in a complex environment.

[0098] Furthermore, this application will further elaborate on the circuit working principles of each unit in the above-mentioned groove-shaped photoelectric sensor. Please refer to Figure 5, which is the functional module diagram of the groove photoelectric sensor provided by the embodiment of the present application. In addition to the above-mentioned transmitting unit 2, receiving unit 4, reflecting unit 3 and main control unit, the present application is also provided with a power supply unit, an output protection unit and a conversion unit connected to the main control unit. The input voltage V24P0 is converted into the working power supply V5P0 by the power supply unit, and overvoltage protection is provided for the circuit; the output protection unit provides output circuit protection for the circuit when a short circuit occurs in the circuit, and the conversion unit converts the output state of the groove photoelectric sensor.

[0099] Specifically, please refer to Figure 6 , which is the circuit schematic diagram of the transmitting unit 2 in the groove photoelectric sensor provided by the embodiment of the present application. The transmitting unit 2 includes the above-mentioned light-emitting transistor D5 and the multi-turn potentiometer RT1. It can be observed that the first end of the multi-turn potentiometer RT1 is connected to the PWM pin of the main control unit, the second end of the multi-turn potentiometer RT1 is connected to the base of the triode Q3, the emitter of the triode Q3 is connected with a resistor R25, the third end of the multi-turn potentiometer RT1 is connected with a resistor R24, and the resistor R25 and the resistor R24 are connected together and grounded.

[0100] Further, the cathode of the light-emitting transistor D5 is connected to the collector of the triode Q3. The anode of the light-emitting transistor D5 is connected to the input voltage V24P0 through a resistor R21. A capacitor C14 is connected between the resistor R21 and the anode of the light-emitting transistor D5, and the other end of the capacitor C14 is grounded.

[0101] In the embodiment of the present application, the above-mentioned resistor R24 is a bias resistor, the resistors R21 and R25 are current-limiting resistors, the capacitor C14 is an energy storage and filtering capacitor of the light-emitting transistor D5, and the triode Q3 is a light-emitting control NPN-type triode. When the PWM is at a high level, the base of the triode Q3 is at a high level. At this time, the triode Q3 is turned on and the light-emitting transistor D5 emits light. When the PWM is at a low level, the base of the triode Q3 is at a low level. At this time, the triode Q3 is cut off and the light-emitting transistor D5 does not emit light.

[0102] Further, the above-mentioned multi-turn potentiometer RT1 can be understood as the form of a sliding rheostat. By adjusting the resistance value of the multi-turn potentiometer RT1, the current passing through the base of the triode Q3 can be adjusted, so as to adjust the current passing through the collector and emitter of the triode Q3, and realize the adjustment of the light-emitting intensity of the light-emitting transistor D5.

[0103] It can be observed that the larger the resistance value of the multi-turn potentiometer RT1, the smaller the current passing through the base of the triode Q3, and correspondingly, the smaller the current passing through the collector and emitter of the triode Q3. At this time, the light-emitting intensity of the light-emitting transistor D5 will become weaker; conversely, when the resistance value of the multi-turn potentiometer RT1 is smaller, the current passing through the base of the triode Q3 will be larger, and correspondingly, the current passing through the collector and emitter of the triode Q3 will be larger. At this time, the light-emitting intensity of the light-emitting transistor D5 will become stronger. Thus, by adjusting the resistance value of the multi-turn potentiometer RT1 connected to the transmitting unit 2, the drive current of the light-emitting transistor D5 is adjusted, and thus the intensity of the optical signal emitted by the light-emitting transistor D5 is adjusted.

[0104] Please refer to Figure 7 , which is the circuit schematic diagram of the receiving unit 4 in the groove-type photoelectric sensor provided by the embodiment of the present application. The receiving unit 4 provided by the present application includes a PD receiving tube D3, an operational amplifier U3A, and an operational amplifier U3B. The PD (Photodetector) receiving tube is an important device in an optical communication system, and its function is to convert the received optical signal into a corresponding electrical signal. The PD receiving tube D3 already produced in the prior art can be used to implement this, and the present application does not further limit the specific selection of the above PD receiving tube D3.

[0105] It can be observed that the cathode of the PD receiving tube D3 is connected to the working power supply V5P0 through a resistor R3. A capacitor C6 is connected between the cathode of the PD receiving tube D3 and the resistor R3, and the other end of the capacitor C6 is grounded. The anode of the PD receiving tube D3 is connected to a resistor R13, and the other end of the resistor R13 is grounded.

[0106] Further, a resistor R10 and a capacitor C9 are connected between the anode of the PD receiving tube D3 and the resistor R13. The capacitor C9 is connected between the anode of the PD receiving tube D3 and the resistor R13, and the resistor R10 is connected to the inverting input terminal of the operational amplifier U3B. A resistor R8 is connected to the non-inverting input terminal of the operational amplifier U3B, and the other end of the resistor R8 is grounded. A capacitor C7 is connected in parallel at both ends of the resistor R8, and a resistor R6 and a capacitor C5 are connected in parallel at both ends of the capacitor C7. A working power supply V5P0 is connected between the resistor R6 and the capacitor C5.

[0107] In the present application, a resistor R14 is connected between the output terminal of the operational amplifier U3B and the inverting input terminal of the operational amplifier U3B, and a capacitor C13 is connected in parallel at both ends of the resistor R14. A resistor R9 and a capacitor C8 are connected between the output terminal of the operational amplifier U3B and the inverting input terminal of the operational amplifier U3A. The resistor R9 is connected to the inverting input terminal of the operational amplifier U3A, and the capacitor C8 is connected to the output terminal of the operational amplifier U3B.

[0108] Further, a non-inverting input terminal of the operational amplifier U3A is connected to a resistor R11, and a working power supply V5P0 is connected through the resistor R11. A resistor R12 is connected between the non-inverting input terminal of the operational amplifier U3A and the resistor R11, and the other end of the resistor R12 is grounded. A capacitor C11 is connected in parallel at both ends of the resistor R12.

[0109] A power supply terminal VCC of the operational amplifier U3A is connected to a capacitor C12, the other end of the capacitor C12 is grounded, a working power supply V5P0 is connected between the power supply terminal VCC of the operational amplifier U3A and the capacitor C12, and a ground terminal GND of the operational amplifier U3A is grounded.

[0110] An output terminal OUT of the operational amplifier U3A is connected to a resistor R7, the other end of the resistor R7 is connected to a Receiver pin of the main control unit, a capacitor C10 is connected directly between the Receiver pin of the main control unit and the resistor R7, and the other end of the capacitor C10 is grounded.

[0111] Further, a resistor R5 is connected between an output terminal and an inverting input terminal of the operational amplifier U3A, and a capacitor C4 is connected in parallel at both ends of the resistor R5.

[0112] In the above receiving unit 4, the resistors R3 and R13 are current-limiting resistors, the capacitor C6 is a filtering capacitor, the capacitor C9 is a DC-blocking capacitor, the resistor R10 is an input matching resistor, the resistor R14 is a resistor for adjusting the amplification factor of the operational amplifier U3B, the capacitor C13 is a high-frequency filtering capacitor of the operational amplifier U3B, the capacitors C7 and C5 are filtering capacitors, the resistors R6 and R8 are reference voltage dividing resistors of the operational amplifier U3B, the capacitor C8 is a DC-blocking capacitor, the resistor R9 is an input matching resistor, the resistor R5 is a resistor for debugging the amplification factor of the operational amplifier U3A, the capacitor C4 is a high-frequency filtering capacitor of the operational amplifier U3A, the resistors R11 and R12 are reference voltage dividing resistors of the operational amplifier U3A, the capacitor C12 is a filtering capacitor, the resistor R7 is an output matching resistor, the capacitor C10 is a filtering capacitor. In this application, the PD receiving tube D3 receives the optical signal passing through the second polarizer 41, couples the optical signal to the operational amplifier through the capacitor C9 and the resistor R10 for reverse amplification, the reversely amplified signal then enters the operational amplifier U3A through the capacitor C8 and the resistor R9 for reverse amplification again, is filtered through the resistor R7 and the capacitor C10, and then enters the main control unit through the Receiver pin, so as to transmit the electrically converted signal of the optical signal to the main control unit after two-stage amplification and filtering.

[0113] Please refer to Figure 8, which is the circuit schematic diagram of the power supply unit in the grooved photoelectric sensor provided by the embodiment of the present application. The power supply unit includes an LDO (Low Dropout Regulator) U2 and a zener diode D2 arranged between the VIN terminal and the GND terminal of the low-dropout linear regulator U2. In the present application, a capacitor C2 is arranged in parallel at both ends of the zener diode D2. One end of the capacitor C2 is connected to the input voltage V24P0, and the other end is grounded.

[0114] Furthermore, the present application also provides an interface J1 and an interface J2. Connect the interface J1 to the positive pole of the power supply and the interface J2 to the negative pole of the power supply. A varistor RV1 is arranged in parallel between the interface J1 and the interface J2. After connecting the varistor RV1 to the resistor R2 and the diode D1, they are arranged in parallel at both ends of the capacitor C2. The cathode of the diode D1 is connected to the capacitor C2 and then connected to the input voltage V24P0. The anode of the diode D1 is connected to the resistor R2. A capacitor C1 is arranged through the output terminal of the low-dropout linear regulator U2, and the other end of the capacitor C1 is grounded. The required working power supply V5P0 is output through the output terminal VOUT of the low-dropout linear regulator U2.

[0115] In the embodiment of the present application, the above-mentioned varistor RV1 plays a role in surge protection and overvoltage protection. The resistor R2 is a current-limiting resistor, the diode D1 is an antipolarity diode, the capacitor C2 is a power input filter capacitor, the zener diode D2 plays an overvoltage protection role, and the input voltage V24P0 is converted into the working power supply V5P0 through the low-dropout linear regulator U2. The capacitor C1 is a power output filter capacitor, so as to realize the transmission of the converted working power supply V5P0 to other units for use.

[0116] Please refer to Figure 9 , which is the circuit schematic diagram of the output protection unit in the grooved photoelectric sensor provided by the embodiment of the present application. The output protection unit includes a triode Q1 and a triode Q2. The base of the triode Q1 is connected to the Sense_out pin of the main control unit through a resistor R15. A resistor R16 is connected between the resistor R15 and the base of the triode Q1, and the other end of the resistor R16 is grounded.

[0117] Furthermore, it can be observed that the collector of the triode Q1 is connected to an interface J3, and a load is externally connected through the interface J3. A varistor RV2 is connected between the collector of the triode Q1 and the interface J3, and the other end of the varistor RV2 is grounded.

[0118] The emitter of the triode Q1 is connected to a resistor R20, and the other end of the resistor R20 is grounded. A resistor R18 is connected between the base of the triode Q2 and the emitter of the triode Q1. It can be observed that a resistor R19 is connected between the base and the emitter of the triode Q2, and the emitter of the triode Q2 is grounded.

[0119] Further, the collector of the triode Q2 is connected to a working power supply V5P0 through a resistor R17, and the connection node between the resistor R17 and the collector of the triode Q2 is connected to the Short_Check pin of the main control unit.

[0120] In the above output protection unit, the resistor R15 is a current-limiting resistor, and the resistor R16 is a voltage-dividing bias resistor. When the output signal of the pin Sense_out is at a high level, the voltage Vbe between the base and the emitter of the triode Q1 is greater than 0.7V, enabling the triode Q1 to conduct. The triode Q1 is an output triode, the resistor R20 is a short-circuit protection sampling resistor, the resistor R18 is a short-circuit protection current-limiting resistor, and the resistor R19 is a voltage-dividing bias resistor. When the voltage across the resistor R20 is greater than 0.7V, the voltage Vbe between the base and the emitter of the triode Q2 is greater than 0.7V, and the triode Q2 can conduct.

[0121] Further, the above resistor R17 is a current-limiting pull-up resistor, the varistor RV2 is an output surge protection varistor, and Short_Check is a pin for short-circuit protection detection. When the Sense_out output signal is at a high level, the potential of the base of the triode Q1 increases, the triode Q1 conducts, and the output line J3 is pulled low, outputting a low level. When the load externally connected to J3 is short-circuited, the current passing through the triode Q1 instantaneously increases.

[0122] When the voltage across the resistor R20 is greater than 0.7V and the voltage Vbe between the base and the emitter of the triode Q2 is greater than 0.7V, the triode Q2 conducts, the potential of the collector of the triode Q2 is pulled low, and the Short_Check signal changes from a high level to a low level. When the main control unit detects that the Short_Check signal changes from a high level to a low level, it will make the output signal Sense_out output a low level, turning off the triode Q1, thereby playing a role in protecting the output circuit.

[0123] Please refer to Figure 10 For the circuit schematic diagram of the conversion unit in the groove-type photoelectric sensor provided by the embodiment of the present application, the above conversion unit includes a resistor R26, a resistor R27, and a diode D7 connected in sequence. The DO / LO pin of the main control unit is connected between the resistor R26 and the resistor R27. The other end of the resistor R26 is connected to the working power supply V5P0, and the cathode of the diode is connected to the interface I4.

[0124] In the embodiment of the present application, the above-mentioned resistor R26 is a pull-up resistor, the resistor R27 is a current-limiting resistor, the diode D7 is an anti-polarity protection diode, and J4 is a normally open and normally closed wire in the power supply line 19. When J4 is not connected or connected to the positive power supply, the DO / LO signal is at a high level. The main control unit sets that when there is an object to be detected between the emitting unit 2 and the reflecting unit 3, the slot photoelectric sensor outputs, and when there is no object to be detected, the slot photoelectric sensor does not output. This state is called normally open.

[0125] On the contrary, when J4 is connected to the negative power supply, DO / LO is at a low level. The main control unit sets that when there is an object to be detected between the emitting unit 2 and the reflecting unit 3, the slot photoelectric sensor does not output, and when there is no object to be detected, the slot photoelectric sensor outputs. This state is called normally closed, so as to convert the normally open state and the normally closed state of the slot photoelectric sensor according to requirements.

[0126] Please refer to Figure 11 , which is the circuit schematic diagram of the indicating unit in the slot photoelectric sensor provided by the embodiment of the present application. The slot photoelectric sensor provided by the present application is also provided with an indicating unit, and the indicating unit includes the above-mentioned first indicator light 16 and second indicator light 17. The first indicator light 16 corresponds to the light-emitting diode D4 in the figure, and the second indicator light 17 corresponds to the light-emitting diode D6 in the figure.

[0127] Among them, the light-emitting diode D4 is a green indicator light LED_Green, connected to the LED2 pin of the main control unit, the light-emitting diode D6 is a red indicator light LED_RED, connected to the LED1 pin of the main control unit, the resistor R22 is the current-limiting resistor corresponding to the light-emitting diode D4, and the resistor R23 is the current-limiting resistor corresponding to the light-emitting diode D6. When the slot photoelectric sensor is normally powered, the light-emitting diode D4 emits light. When the slot photoelectric sensor normally outputs, the light-emitting diode D6 emits light. On the contrary, the light-emitting diode D6 goes out.

[0128] Please refer to Figure 12 , which is the circuit schematic diagram of the main control unit in the slot photoelectric sensor provided by the embodiment of the present application. The main control unit includes an MCU (Microcontroller Unit), and each pin is connected to the corresponding unit to implement the required functions according to requirements. The present application does not elaborate too much on the specific wiring method of the main control unit here.

[0129] It should be known that the above Figures 6-12The circuit schematic diagrams of the transmitting unit 2, receiving unit 4, indicating unit, conversion unit, output protection unit, power supply unit, and main control unit shown are only an optional implementation provided by this application and do not further limit the specific circuits of each unit in this application. As long as other circuit connection methods can achieve the working principles of the above units, they are also feasible, and this application does not impose any restrictions on this.

[0130] Based on the above groove-type photoelectric sensor, this application also provides a groove-type photoelectric sensor detection circuit. Please further refer to Figure 5 , and it can be observed that the groove-type photoelectric sensor detection circuit includes a transmitting unit, a receiving unit, a reflection unit, a main control unit, a power supply unit, an output protection unit, an indicating unit, and a conversion unit.

[0131] Among them, the transmitting unit is used to emit optical signals;

[0132] The reflection unit is used to deflect the phase of the optical signal by a preset angle and reflect the optical signal;

[0133] The receiving unit is used to receive the optical signal with the deflected phase, convert the optical signal into an electrical signal, and perform two amplifications and filtering on the electrical signal, and transmit the amplified and filtered electrical signal to the main control unit;

[0134] The main control unit is used to compare the electrical signal with a preset threshold to determine whether there is a target detection object between the transmitting unit and the reflection unit;

[0135] The power supply unit is used to convert the input voltage into a working power supply and provide overvoltage protection for the circuit;

[0136] The output protection unit is used to provide output circuit protection for the circuit in case of a short circuit;

[0137] The conversion unit is used to convert the normally open state and normally closed state of the groove-type photoelectric sensor;

[0138] The indicating unit is used to indicate the power supply state and output state of the groove-type photoelectric sensor;

[0139] It also includes an adjusting member connected to the transmitting unit, and this adjusting member is used to adjust the luminous intensity of the optical signal.

[0140] Regarding other details of how each unit in the above detection circuit implements the above technical solutions, reference can be made to the description of the groove-type photoelectric sensor provided in the above application embodiments, and details will not be elaborated here.

[0141] A slot-type photoelectric sensor provided by the present application arranges the emitting unit and the receiving unit on the same side, and arranges the reflecting unit corresponding to the emitting unit. A first polarizer and a one-way light-transmitting mirror are arranged between the emitting unit and the reflecting unit. The light-transmitting surface of the one-way light-transmitting mirror is arranged close to the first polarizer, so that the optical signal passing through the first polarizer enters the reflecting unit through the light-transmitting surface of the one-way light-transmitting mirror. The reflecting unit deflects the phase of the optical signal by a preset angle and reflects the optical signal, so that the optical signal after the phase deflection will be transmitted to the second polarizer through the reflecting surface of the one-way light-transmitting mirror. Since the first polarizer can pass the optical signal in the first direction, the second polarizer can pass the optical signal in the second direction, and the angle formed between the first direction and the second direction is the preset angle, it can be ensured that the optical signal deflected by the preset angle by the reflecting unit can smoothly pass through the second polarizer and enter the receiving unit. The present application also sets a multi-turn potentiometer to precisely adjust the luminous intensity of the optical signal, and the optical paths of emission and reception are on the same straight line without an angle, so that the occurrence of missed detection caused by blind spots can be avoided, and the precise detection of a near-distance transparent object can be effectively realized.

[0142] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

[0143] In summary, although the present invention has been disclosed above with preferred embodiments, the above preferred embodiments are not used to limit the present invention. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in the various embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A grooved photoelectric sensor, characterized in that, It includes a transmitting unit, a reflecting unit disposed opposite to the transmitting unit, and a receiving unit disposed on the same side as the transmitting unit; A first polarizer and a one-way light-transmitting mirror are disposed between the transmitting unit and the reflecting unit. The first polarizer is used to pass the optical signal in the first direction. The one-way light-transmitting mirror is obliquely disposed between the first polarizer and the reflecting unit. The light-transmitting surface of the one-way light-transmitting mirror is disposed close to the first polarizer, and the light-reflecting surface of the one-way light-transmitting mirror is disposed close to the reflecting unit; A second polarizer is disposed between the light-reflecting surface of the one-way light-transmitting mirror and the receiving unit. The second polarizer is used to pass the optical signal in the second direction. The reflecting unit is used to deflect the phase of the optical signal by a preset angle and reflect the optical signal, so that the deflected-phase optical signal is transmitted to the second polarizer through the light-reflecting surface of the one-way light-transmitting mirror; Wherein, the angle formed by the first direction and the second direction is the preset angle; The grooved photoelectric sensor further includes a grooved housing. A first accommodating cavity and a second accommodating cavity opposite to the first accommodating cavity are disposed in the grooved housing. The transmitting unit and the reflecting unit are respectively disposed in the first accommodating cavity and the second accommodating cavity, and the receiving unit is disposed on the same side as the transmitting unit; A first light-transmitting hole is disposed on the side wall of the first accommodating cavity facing the second accommodating cavity. The transmitting unit faces the first light-transmitting hole, and the one-way light-transmitting mirror and the first polarizer are sequentially disposed between the first light-transmitting hole and the transmitting unit; A second light-transmitting hole is disposed on the side wall of the second accommodating cavity facing the first accommodating cavity. The reflecting unit faces the second light-transmitting hole.

2. The grooved photoelectric sensor according to claim 1, wherein The transmitting unit is used to emit the optical signal, and the optical signal is sequentially transmitted to the reflecting unit through the first polarizer and the light-transmitting surface of the one-way light-transmitting mirror; The reflecting unit is used to deflect the phase of the optical signal by a preset angle and reflect the deflected-phase optical signal. The deflected optical signal is transmitted to the second polarizer through the light-reflecting surface of the one-way light-transmitting mirror, so that the receiving unit receives the optical signal passing through the second polarizer.

3. The grooved photoelectric sensor according to claim 2, characterized in that, The grooved photoelectric sensor further includes a main control unit, and the main control unit is connected to the transmitting unit and the receiving unit; The receiving unit is used to convert the optical signal passing through the second polarizer into an electrical signal, and the main control unit is used to receive the electrical signal and judge whether there is a target detection object between the transmitting unit and the reflecting unit according to the electrical signal.

4. The grooved photoelectric sensor according to claim 1, wherein The grooved photoelectric sensor further includes an adjusting member for adjusting the light-emitting intensity of the optical signal. The adjusting member is connected to the light-emitting transistor of the transmitting unit, and the driving current of the light-emitting transistor is adjusted by adjusting the resistance value of the adjusting member connected to the transmitting unit.

5. The grooved photoelectric sensor according to claim 1, characterized in that, The plane where the first polarizer is located is perpendicular to the plane where the second polarizer is located; the reflecting unit includes a reflecting prism, and the reflecting prism is used to deflect the phase of the optical signal by 90 degrees.

6. The grooved photoelectric sensor according to claim 1, wherein, A first inclination angle is formed between the plane where the first polarizing plate is located and the plane where the one-way light-transmitting mirror is located, and the first inclination angle is an acute angle.

7. The grooved photoelectric sensor according to claim 1, characterized in that, A first light-transmitting plate is disposed in the first light-transmitting hole, and a second light-transmitting plate is disposed in the second light-transmitting hole, so that the optical signal is sequentially transmitted to the reflection unit through the first light-transmitting plate and the second light-transmitting plate, and then transmitted to the receiving unit through the second light-transmitting plate and the first light-transmitting plate.

8. The grooved photoelectric sensor according to claim 4, wherein A third accommodation cavity is further disposed in the trough-shaped housing, the adjusting member is a multi-turn potentiometer, an adjusting knob is disposed on the outer side wall of the trough-shaped housing, and the adjusting knob is connected to the multi-turn potentiometer disposed in the third accommodation cavity; The resistance value of the multi-turn potentiometer connected to the transmitting unit is adjusted by rotating the adjusting knob.

9. The grooved photoelectric sensor according to claim 1, characterized in that, A first indicator light and a second indicator light are further disposed in the trough-shaped housing; The first indicator light is used to indicate whether the trough-shaped photoelectric sensor is normally powered; The second indicator light is used to indicate whether there is a target detection object between the first light-transmitting hole and the second light-transmitting hole.

Images