CN214470935U - Mirror reflection type photoelectric sensor and system - Google Patents
Mirror reflection type photoelectric sensor and system Download PDFInfo
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- CN214470935U CN214470935U CN202120717655.6U CN202120717655U CN214470935U CN 214470935 U CN214470935 U CN 214470935U CN 202120717655 U CN202120717655 U CN 202120717655U CN 214470935 U CN214470935 U CN 214470935U
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Abstract
The utility model provides a mirror reflection formula photoelectric sensor and system belongs to photoelectric detection's technical field, has solved and has detected unsafe technical problem under the installation environment that can take place the shake. The mirror reflection type photoelectric sensor comprises an emitting unit and a receiving unit, wherein light spots of visible laser emitted by the emitting unit are in a strip shape or an oval shape, and the visible laser enters the receiving unit after being reflected; the emitting unit comprises an emitting diode and an emitting lens, the emitting lens is arranged on an emitting light path of the emitting diode, and the emitting lens is a symmetrical lens; the receiving unit includes a receiver and a receiving lens disposed on an incident light path of the receiver.
Description
Technical Field
The utility model belongs to the technical field of photoelectric detection technique and specifically relates to a mirror reflection formula photoelectric sensor and system are related to.
Background
With the rapid development of industrial automation, photoelectric sensors play an increasingly important role. The mirror reflection type photoelectric sensor is convenient to install and connect, high in cost performance and widely applied to the fields of machinery, logistics, door industry and the like.
The existing mirror reflection type photoelectric sensor system mainly comprises an emitting unit, a receiving unit and an external matched reflecting plate, wherein two optical axes of the emitting unit and the receiving unit are parallel to each other and are arranged on the same side. The emitted light beam is collimated by the emitting lens, then reflected along the original light path after striking the installed reflector, and focused on the photoelectric receiver through the receiving lens to form a feedback signal. When a person or an object blocks the light path, no feedback signal exists, the output state of the sensor changes, and signal detection is realized.
In the existing mirror reflection type photoelectric sensor system, a light source is a red visible laser diode, and the technical characteristics are that the divergence angle is small, the brightness is high, the light is output in a form of point-shaped light spots after being collimated, the visibility in an outdoor environment is good, and the farthest distance is long; the defect is that the light spot is too small (about 10mm at 10 meters), when the device is applied to the fields of outdoor roller shutter doors and the like, the light-emitting direction of a photoelectric sensor arranged on a door frame can be swung leftwards and rightwards due to the swinging of the door, so that the light spot position irradiated on the reflector is deviated leftwards and rightwards, when the light spot is deviated from the reflector, a return signal cannot be received, the false operation is generated (the deviation can be increased along with the increase of the actual installation distance), the potential safety hazard exists, and the accident is caused.
Therefore, the prior art has the technical problem of inaccurate detection in the installation environment where jitter can occur.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a mirror reflection formula photoelectric sensor and system has solved and has detected unsafe technical problem under the installation environment that can take place the shake.
In a first aspect, the utility model provides a mirror reflection type photoelectric sensor, including a transmitting unit and a receiving unit, the light spot of the visible laser emitted by the transmitting unit is in a strip shape or an ellipse shape, and the visible laser enters the receiving unit after being reflected;
the emitting unit comprises an emitting diode and an emitting lens, the emitting lens is arranged on an emitting light path of the emitting diode, and the emitting lens is a symmetrical lens;
the receiving unit includes a receiver and a receiving lens disposed on an incident light path of the receiver.
Further, the distance between the emission lens and the emission diode is smaller than the focal length of the emission lens.
Further, the emission lens is an aspheric symmetrical lens.
Further, the emission unit further includes an emission polarizing plate disposed on an emission optical path of the emission diode.
Further, the emitting unit further comprises a sleeve, and the distance between the sleeve and the emitting diode is adjustable;
the emission lens is mounted on the sleeve.
Further, the receiving unit further includes a receiving polarizer disposed on an incident light path of the receiver.
Further, the receiving unit further includes an optical filter disposed between the receiver and the receiving polarizer.
Further, the emitting diode is a red visible laser diode.
In a second aspect, the present invention further provides a mirror reflection type photoelectric sensor system, which includes a reflector and the mirror reflection type photoelectric sensor;
the transmitting unit of the mirror reflection type photoelectric sensor emits visible laser, and the visible laser enters the receiving unit of the mirror reflection type photoelectric sensor after being reflected by the reflecting plate.
The utility model provides a mirror reflection formula photoelectric sensor, including transmitting element and receiving element, the facula that transmitting element sent visible laser is rectangular form or oval, and visible laser gets into receiving element after reflecting. The emission unit comprises an emission diode and an emission lens, the emission lens is arranged on an emission light path of the emission diode, and the emission lens is a symmetrical lens. The receiving unit includes a receiver and a receiving lens disposed on an incident light path of the receiver. Because the light spot of the visible laser is in a strip shape or an oval shape, even if the visible laser shakes, the light spot can fall on the reflector, false operation caused by light spot deviation can not be generated, and the technical problem of inaccurate detection in the prior art is solved.
Correspondingly, the embodiment of the utility model provides a mirror reflection formula photoelectric sensor system also has above-mentioned technological effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a mirror reflection type photoelectric sensor provided in an embodiment of the present invention;
fig. 2 is a schematic diagram of an emission lens in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a conventional light spot;
fig. 4 is a schematic view of a light spot in the embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The terms "comprising" and "having," and any variations thereof, as referred to in the embodiments of the present invention, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
An embodiment of the utility model provides a mirror reflection formula photoelectric sensor, including transmitting element and receiving element. The light spot of the visible laser emitted by the emitting unit is in a strip shape or an oval shape, and the visible laser enters the receiving unit after being reflected.
As shown in fig. 1, the transmitting unit and the receiving unit are integrated in the same housing 2, and the housing 2 is provided with a through hole for connecting the cable 1. The transmitting unit comprises a transmitting diode 3, which in this embodiment is a red visible laser diode, and a transmitting lens 6, and the receiving unit comprises a receiver 13 and a receiving lens 10. The emitting diode 3 and the receiver 13 are mounted on the emitting base 4, and the emitting lens 6 and the receiving lens 10 are mounted on the mirror holder 7. The emission lens 6 is a symmetrical lens and is disposed on the emission light path of the emission diode 3, and the reception lens 10 is disposed on the incident light path of the receiver 13.
Because the light spot of the visible laser is in a strip shape or an oval shape, even if the visible laser shakes, the light spot can fall on the reflector 9, false operation caused by light spot deviation can not be generated, and the technical problem of inaccurate detection in the prior art is solved.
In one possible embodiment, the emission lens 6 is an aspherical symmetric lens. The laser diode has the characteristics of different divergence angles of fast and slow axes and good high-brightness visibility, so that the emitted light spots are in a strip shape. In the embodiment, the non-spherical symmetrical lens is used, the divergence angle of the fast and slow axes is not corrected, and finally emitted light spots are in a strip shape, so that the anti-shaking effect is achieved. In other embodiments, the emission lens may also adopt a spherical symmetric lens.
The aspheric mirror or the spherical mirror can be a circularly symmetric lens if the application scene is not particularly limited.
In one possible embodiment, as shown in fig. 2, the distance between the emission lens 6 and the emission diode 3 is smaller than the focal length of the emission lens 6, so that the laser light emitted after passing through the emission lens 6 is not parallel light but emitted in the form of a divergent beam, increasing the area of the light spot, which is typically 100mm x 40mm at 10 meters. The output light spots are divergent and two strip-shaped light spots which are asymmetric in the vertical direction, so that the visibility requirement is met, and the anti-jitter capability is improved. The spot area of the present embodiment is merely an example, and the present invention is not limited to this in other embodiments.
In a possible embodiment, the emission unit further comprises a sleeve 5, the distance between the sleeve 5 and the emission diode 3 being adjustable, the emission lens 6 being mounted on the sleeve. The position of the emitting diode 3 relative to the emitting lens 6 can be adjusted by using the sleeve 5 according to the size of the light spot at the using distance, and the light spot at the same testing distance is larger the closer the emitting diode 3 is placed to the emitting lens 6.
In a possible implementation manner, the emission unit further includes an emission polarizer 8 disposed on the emission light path of the emission diode 3, and due to the light emitting characteristic of the emission diode 3, the emergent light is linearly polarized light, and the divergence polarizer 8 is added in accordance with the polarization direction of the emergent light, so that the polarization degree of the output laser light can be improved.
Further, the receiving unit further includes a receiving polarizer 11 disposed on an incident light path of a receiver 13, and the receiver 13 is a photoelectric receiver. The structure of the reflector 9 is usually formed by a micro cube-corner prism array, and after the output laser light hits the reflector 9, the light beam returns along the original light path, and the polarization direction is rotated by 90 degrees. After passing through the receiving lens 10, it is focused on the receiver 13, generating a feedback signal. The receiving polarizing plate 11 (the polarization direction is perpendicular to the polarization direction of the diverging polarizing plate 8) is added in the light path in front of the receiver 13, so that only the polarized light reflected from the reflector 9 can be transmitted, other diffusely reflected unpolarized light can be filtered, and the function of reducing misoperation can be achieved.
In a possible embodiment, the receiving unit further comprises a filter 12 arranged between the receiver 13 and the receiving polarizer 11. The optical filter 12 corresponding to the wavelength range of the emitted laser is added in the light path in front of the receiver 13, so that the anti-interference capability to the external environment light can be enhanced.
As shown in fig. 3, in the prior art, the vibration of the security gate may cause the emergent light spot 20 to shake horizontally, and the point light source fails after being shifted leftward by a distance greater than L, for example. As shown in fig. 4, in contrast, the offset L 'of the stripe-shaped light spot 20' in the embodiment of the present invention is obviously several times better than that of the point light source. The distance of 10 meters is used, the light spot length is 10cm as an example, the side length of the reflector panel is 5cm, L is 2.5cm, L 'is 7.5cm, the anti-shaking capability is improved by 3 times, the maximum distance of the actual measurement of the product can also reach more than 10 meters, the deviation amplitude of the light spot driven by the vibration of the safety door is far smaller than L', the false operation caused by the deviation of the light spot can not be generated, and the safety door has the advantages of safety, reliability, good visibility, long detection distance, convenience in installation and use, high cost performance and the like.
The embodiment of the utility model provides a still provide a mirror reflection formula photoelectric sensor system, including the mirror reflection formula photoelectric sensor that reflector and above-mentioned embodiment provided, visible laser is sent to mirror reflection formula photoelectric sensor's transmitting element, gets into mirror reflection formula photoelectric sensor's receiving element after the reflector reflection.
The embodiment of the utility model provides a mirror reflection formula photoelectric sensor system has the same technical characteristics with the mirror reflection formula photoelectric sensor that above-mentioned embodiment provided, so also can solve the same technical problem, reaches the same technological effect.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention. Are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A mirror reflection type photoelectric sensor is characterized by comprising an emitting unit and a receiving unit, wherein light spots of visible laser emitted by the emitting unit are in a strip shape or an oval shape, and the visible laser enters the receiving unit after being reflected;
the emitting unit comprises an emitting diode and an emitting lens, the emitting lens is arranged on an emitting light path of the emitting diode, and the emitting lens is a symmetrical lens;
the receiving unit includes a receiver and a receiving lens disposed on an incident light path of the receiver.
2. The mirrored reflective photosensor according to claim 1, wherein the distance between the emission lens and the emission diode is less than the focal length of the emission lens.
3. The mirrored reflective photosensor according to claim 1, wherein the emission lens is an aspheric symmetric lens.
4. The mirrored reflective photosensor according to claim 1, wherein the emitter cell further comprises an emitter polarizer disposed in the emission path of the emitter diode.
5. The mirrored reflective photosensor according to claim 1, wherein the emitter unit further comprises a sleeve, the distance between the sleeve and the emitting diode being adjustable;
the emission lens is mounted on the sleeve.
6. The mirrored reflective photosensor according to claim 1, wherein the receiving unit further comprises a receiving polarizer disposed on the incident light path of the receiver.
7. The mirrored reflective photosensor according to claim 6, wherein the receiving cell further comprises a filter disposed between the receiver and the receiving polarizer.
8. The mirrored reflective photosensor according to claim 1, wherein the emitting diode is a red visible laser diode.
9. A mirror-reflective photosensor system comprising a reflector and the mirror-reflective photosensor according to any one of claims 1 to 8;
the transmitting unit of the mirror reflection type photoelectric sensor emits visible laser, and the visible laser enters the receiving unit of the mirror reflection type photoelectric sensor after being reflected by the reflecting plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120717655.6U CN214470935U (en) | 2021-04-08 | 2021-04-08 | Mirror reflection type photoelectric sensor and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120717655.6U CN214470935U (en) | 2021-04-08 | 2021-04-08 | Mirror reflection type photoelectric sensor and system |
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| Publication Number | Publication Date |
|---|---|
| CN214470935U true CN214470935U (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120717655.6U Active CN214470935U (en) | 2021-04-08 | 2021-04-08 | Mirror reflection type photoelectric sensor and system |
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| CN (1) | CN214470935U (en) |
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2021
- 2021-04-08 CN CN202120717655.6U patent/CN214470935U/en active Active
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