Miniaturized deviation correction sensor

Abstract

The utility model belongs to the technical field of sensors, and discloses a miniaturized deviation rectifying sensor, which comprises a light source, a Fresnel diffraction mirror, a photoelectric detector and a signal processing module which are sequentially arranged along the direction of a light path, the light source emits divergent light beams to the Fresnel diffraction mirror, the Fresnel diffraction mirror receives the divergent light beams, converts the divergent light beams into parallel light beams and emits the parallel light beams to the photoelectric detector, and the photoelectric detector receives the parallel light beams and outputs electric signals to the signal processing module. And the signal processing module outputs offset according to the electric signal. According to the utility model, by arranging the Fresnel diffraction mirror, divergent light beams are directly converted into parallel light beams, an additional light path adjusting device is not needed, the overall structure size of the sensor is reduced, the stability and the detection precision of the light beams are improved, high-efficiency acquisition and processing of signals are ensured, and the detection accuracy is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology and relates to a miniaturized correction sensor. Background Technology

[0002] In modern industrial automated production processes, deviation correction sensors, as key components ensuring production accuracy and product quality, are widely used in various fields such as printing, packaging, textiles, and film processing. They can monitor and detect material deviations in real time, providing precise feedback signals to the system for timely adjustments to production equipment, ensuring the continuity and stability of the production process.

[0003] With the increasing integration and sophistication of industrial equipment, the demand for miniaturized polarization correction sensors is becoming increasingly urgent. Traditional polarization correction sensors rely on spherical lenses or complex lens groups to achieve beam collimation and focusing, resulting in long optical paths and stacked components. This not only occupies a large amount of installation space but also increases the overall size and weight of the equipment, making it difficult to meet the installation requirements of miniaturized devices. In addition, the stringent requirements for mechanical alignment accuracy between multiple components further increase assembly difficulty and cost.

[0004] Therefore, there is an urgent need in this field for a miniaturized correction sensor to solve the above-mentioned technical problems. Utility Model Content

[0005] In view of this, the purpose of this utility model is to solve the above problems and provide a miniaturized polarization correction sensor, including a light source, a Fresnel diffractometer, a photodetector and a signal processing module arranged sequentially along the optical path;

[0006] The light source emits a diverging beam to the Fresnel diffractometer, which receives the diverging beam and converts it into a parallel beam, which is then emitted to the photodetector. The photodetector receives the parallel beam and outputs an electrical signal to the signal processing module. The signal processing module outputs an offset based on the electrical signal.

[0007] As a further improvement of this utility model, it also includes a steering mirror, which is disposed between the Fresnel diffractometer and the photodetector. The plane where the Fresnel diffractometer is located is perpendicular to the plane where the photodetector is located, and the plane where the steering mirror is located forms a 45-degree angle with the plane where the Fresnel diffractometer is located and the plane where the photodetector is located.

[0008] As a further improvement of this utility model, the Fresnel diffractometer includes an incident surface and an exit surface arranged opposite to each other, the incident surface facing the light source, and the incident surface is a smooth plane.

[0009] As a further improvement of the utility model, the exit surface includes a central exit area and a plurality of concentric arc-shaped tooth patterns arranged around the central exit area, and the central thickness of the central exit area is 0.59-0.61mm.

[0010] As a further improvement of the utility model, the number of tooth patterns is 13, and the tooth depth of the tooth patterns is 0.15-0.25mm.

[0011] As a further improvement of the utility model, the optical axis of the light source is coaxial with the optical axis of the Fresnel diffraction mirror.

[0012] As a further improvement of the utility model, the light source is a laser diode or an LED light source.

[0013] As a further improvement of the utility model, the wavelength of the divergent light beam emitted by the light source is 650nm.

[0014] As a further improvement of the utility model, the turning mirror is a plane mirror.

[0015] As a further improvement of the utility model, the photoelectric detector is a linear array CMOS image sensor.

[0016] The technical effect of the utility model is that, compared with the prior art, the miniaturized deviation correction sensor provided by the utility model reduces the stacking of complex optical components, effectively reduces the overall volume of the sensor, and meets the installation requirements of miniaturized industrial equipment; the Fresnel diffraction mirror directly converts the divergent light beam into a parallel light beam without the need for an additional optical path adjustment device, simplifies the detection process, further reduces the overall structural size of the sensor, improves the space utilization rate, improves the stability and detection accuracy of the light beam; the cooperative work of the photoelectric detector and the signal processing module ensures efficient signal acquisition and processing, and further improves detection accuracy; at the same time, the simplified structure design reduces the material and process cost in the production and manufacturing process, has the advantages of high precision and low cost, and is suitable for automatic production scenes in multiple fields. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only part of the embodiments of the utility model, not all the embodiments, and for those skilled in the art, other drawings obtained according to these drawings without creative labor belong to the protection scope of the utility model.

[0018] Fig. 1It is a structure schematic diagram of a miniaturized deviation rectifying sensor provided by the embodiment of the utility model.

[0019] Fig. 2 It is a structure schematic diagram of a Fresnel diffraction mirror provided by the embodiment of the utility model.

[0020] Wherein, 1 is light source, 2 is Fresnel diffraction mirror, 21 is incident surface, 22 is exit surface, 221 is central exit area, 222 is tooth pattern, 3 is turning mirror, 4 is photoelectric detector, 5 is signal processing module. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the utility model will be further described in detail below by combining with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0022] In order to make the description of the disclosure more detailed and complete, the following describes the embodiments of the utility model and specific embodiments; But this is not the only form of implementation or use of the specific embodiments of the utility model. The embodiments include the features of multiple specific embodiments and the method steps and order used to construct and operate 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 utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0023] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the terms "first", "second" and the like in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0025] In the description of the utility model, the terms "front", "back", "top", "inner", "outer" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0026] Please refer to Figs. 1-2 An embodiment of the utility model provides a miniaturized deviation correction sensor to solve the problem that the prior art deviation correction sensor is difficult to meet the installation requirement of miniaturized equipment, the mechanical alignment precision requirement between multiple components is harsh, and the assembly difficulty is high.

[0027] Specifically, please refer to Fig. 1 The utility model provides a miniaturized deviation correction sensor's structure schematic drawing for the embodiment of the utility model, the miniaturized deviation correction sensor, including light path direction sequentially arranged light source 1, Fresnel diffraction mirror 2, photoelectric detector 4 and signal processing module 5, light source 1 emits divergent light beam to Fresnel diffraction mirror 2, after receiving divergent light beam, Fresnel diffraction mirror 2 converts into parallel light beam and emits to photoelectric detector 4, photoelectric detector 4 receives parallel light beam, and output electric signal to signal processing module 5, and signal processing module 5 exports offset according to electric signal, the object to be measured is arranged between Fresnel diffraction mirror 2 and photoelectric detector 4, when parallel light beam passes through the object to be measured, the propagation path, intensity distribution of light beam etc. are changed due to the object position offset. Photoelectric detector 4 receives the parallel light beam through the object to be measured, and converts the optical signal into the electric signal containing the light beam position and intensity change information. Signal processing module 5 receives the electric signal, and the electric signal is analyzed by the preset algorithm, and the characteristic parameter related to the offset of the object to be measured is extracted, and finally the accurate offset data is output, and the detection of the object offset state is realized.

[0028] The utility model provides a miniaturized deviation correction sensor through the integration of light source 1, Fresnel diffraction mirror 2, photoelectric detector 4 and signal processing module 5, reduces the stacking of complex optical components, effectively reduces the overall volume of sensor, meets the installation requirement of industrial equipment miniaturization, and the divergent light beam is directly converted into parallel light beam by Fresnel diffraction mirror 2, without additional optical path adjusting device, simplifies the detection process, further reduces the overall structure size of sensor, improves the space utilization, improves the stability and detection precision of light beam, the cooperative work of photoelectric detector 4 and signal processing module 5 ensures efficient signal acquisition and processing, and further improves the detection accuracy, meanwhile, the simplified structure design reduces the material and process cost in the production process, has the advantages of high precision and low cost, and is suitable for the automatic production scene in multiple fields.

[0029] As a further improvement of the utility model, the miniaturized deviation correction sensor further comprises a turning mirror 3, the turning mirror 3 is arranged between the Fresnel diffraction mirror 2 and the photoelectric detector 4, the plane where the Fresnel diffraction mirror 2 is located is perpendicular to the plane where the photoelectric detector 4 is located, and the plane where the turning mirror 3 is located forms a 45-degree angle with the plane where the Fresnel diffraction mirror 2 is located and the plane where the photoelectric detector 4 is located respectively. The light source 1 emits a divergent light beam, which is converted into a parallel light beam by the Fresnel diffraction mirror 2 and then propagates to the turning mirror 3. Since the plane where the turning mirror 3 is located forms a 45-degree angle with the plane where the Fresnel diffraction mirror 2 is located and the plane where the photoelectric detector 4 is located respectively, the propagation direction of the parallel light beam is deflected by 90 degrees after the parallel light beam irradiates the turning mirror 3, so that the parallel light beam is perpendicularly incident on the plane where the photoelectric detector 4 is located. In the case that the object to be measured is arranged between the turning mirror 3 and the photoelectric detector 4, the parallel light beam passes through the object to be measured and then propagates to the photoelectric detector 4. The photoelectric detector 4 converts the optical signal into an electrical signal, the signal processing module 5 analyzes and processes the electrical signal, calculates the deviation amount corresponding to the deviation state of the object by an algorithm, and realizes accurate detection of the deviation of the object.

[0030] In some embodiments, the specific structure of the turning mirror 3 can be a plane mirror structure, a triangular prism or a right-angle prism. By arranging the turning mirror 3, the plane where the Fresnel diffraction mirror 2 is located and the plane where the photoelectric detector 4 are arranged vertically, compared with the traditional straight light path structure, the space occupied by the sensor in a single direction is greatly compressed, and the miniaturization and compactness of the sensor are effectively realized. The accurate setting of the 45-degree angle ensures efficient reflection of the light beam, reduces the loss of light energy and signal distortion caused by the bending of the light path, improves the stability of the light beam, and thus improves the accuracy of the signal received by the photoelectric detector 4, and ensures the accuracy of the deviation amount detection result. At the same time, this light path structure design enhances the flexibility of the layout of the internal components of the sensor, facilitates integration with other equipment, reduces the difficulty of complex light path debugging, and is conducive to reducing production costs.

[0031] As a further improvement of the utility model, please see Fig. 2The Fresnel diffraction mirror 2 includes oppositely arranged incident surface 21 and exit surface 22, the incident surface 21 is towards the light source 1, and the incident surface 21 is a smooth plane. The incident surface 21 of the Fresnel diffraction mirror 2 is a smooth plane, and is arranged towards the light source 1. When the divergent light beam emitted by the light source 1 irradiates the smooth incident surface 21, due to the smoothness of the plane, the light rays hardly scatter and diffuse at this position, and can enter the interior of the Fresnel diffraction mirror 2 at a relatively regular angle, ensuring the stability of the initial state of the light beam. The design of the smooth plane of the incident surface 21 reduces the energy loss and distortion of the light rays when entering the Fresnel diffraction mirror 2, improves the light beam quality, and makes the converted parallel light beam have better collimation and stability, thereby improving the detection accuracy of the deviation correction sensor. In addition, the smooth plane structure is easy to process and manufacture, compared with a complex curved surface or texture structure, the production difficulty and manufacturing cost are reduced, which is beneficial to the mass production of small-sized deviation correction sensors. At the same time, the smooth plane is not easy to accumulate dust and impurities, reduces the maintenance frequency, prolongs the service life of the sensor, and enhances the applicability of the sensor in the industrial environment.

[0032] As a further improvement of the utility model, the exit surface 22 includes a central exit area 221 and a plurality of concentric circular arc tooth patterns 222 arranged around the central exit area 221, and the central thickness of the central exit area 221 is 0.59-0.61 mm. The central exit area 221 is designed without tooth patterns 222, directly transmits part of the light beam, serves as a reference light path, and improves the uniformity of the collimated light beam after superimposing with the peripheral diffraction light beam. The central thickness of the central exit area 221 is between 0.59-0.61 mm, and preferably, the central thickness of the central exit area 221 is 0.60 mm. By directly transmitting the divergent light in the central region of the light source 1 through the central exit area 221, the optical integrity in the main optical axis direction is ensured, and the light energy loss caused by the cutting of the tooth patterns 222 in the center of the traditional Fresnel lens is avoided. By arranging a plurality of concentric circular arc tooth patterns 222 around the peripheral side of the central exit area 221, the wavefront phase of the peripheral divergent light beam is modulated, and the wavefront phase of the peripheral divergent light beam is modulated through the diffraction effect, so that the light rays with different incident angles tend to be parallel after refraction through the tooth patterns 222, and the collimation function is realized. Compared with the traditional multi-lens group, the Fresnel diffraction mirror 2 realizes the collimation function through a single lens, reduces the dependence of the multi-lens group on precise assembly, and is beneficial to improving the consistency of the sensor during mass production.

[0033] As a further improvement of the utility model, the number of the tooth patterns 222 is 13, and the tooth depth of the tooth patterns 222 is 0.15-0.25 mm. The 13 concentric arc tooth patterns 222 of the exit surface 22 of the Fresnel diffraction mirror 2 cooperate with the tooth depth of 0.15-0.25 mm. When the light propagates from the central exit area 221 to the tooth pattern 222 area, each tooth pattern 222 can be regarded as an independent miniature optical element. The 13 tooth patterns 222 can uniformly divide the beam edge part into multiple sub-beams, and each tooth pattern 222 refracts and diffracts the corresponding sub-beam. The tooth depth is in the range of 0.15-0.25 mm, which ensures that the tooth pattern 222 produces a suitable phase delay on the light, so that different sub-beams interfere with each other after exiting, compensate for the beam divergence characteristics, and finally accurately convert the divergent beam into a parallel beam. This accurate combination of the number and tooth depth of the tooth patterns 222 realizes accurate regulation of the beam propagation path and phase, and ensures high-quality output of the parallel beam. Preferably, the tooth depth of the tooth pattern 222 is 0.20 mm. Reasonable number of tooth patterns 222 avoids the problems of insufficient beam segmentation due to too few, increased manufacturing complexity and cost due to too many, and ensures uniform adjustment of the beam; the appropriate tooth depth ensures that the light phase delay is in the best range, reduces beam distortion and energy loss, and makes the converted parallel beam more collimated, thereby more accurately capturing the offset information of the object to be measured. From the manufacturing point of view, the fixed number of tooth patterns 222 and the controllable tooth depth range facilitate the use of standardized processing technology, reduce mold development difficulty and production cost, improve production efficiency, and facilitate large-scale production of products.

[0034] As a further improvement of the utility model, the optical axis of the light source 1 is coaxial with the optical axis of the Fresnel diffraction mirror 2. The coaxial arrangement of the optical axis of the light source 1 and the optical axis of the Fresnel diffraction mirror 2 ensures that the divergent beam emitted by the light source 1 can be symmetrically and uniformly projected to the mirror along the central axis of the Fresnel diffraction mirror 2. This coaxial arrangement ensures that the beam will not be distorted or locally lose energy due to off-center incidence during the process of entering the Fresnel diffraction mirror 2, so that the light propagates to the entrance surface 21 of the Fresnel diffraction mirror 2 in a stable state.

[0035] As a further improvement of the utility model, the light source 1 is a laser diode or LED light source 1. The light source 1 is set to be a laser diode or LED light source 1, so that the deviation correction sensor has more performance advantages. The laser diode light source 1 has the characteristics of high brightness, high directivity and good monochromaticity, can improve the stability of the light beam in the transmission process, reduce the influence of external light interference on the detection result, thereby significantly improve the detection accuracy and sensitivity of the sensor, and is suitable for precision machining, electronic component manufacturing and other scenes with very high detection accuracy requirements. The LED light source 1 has the advantages of low cost, long service life, low power consumption and low heating, and does not need a complex driving circuit, thereby reducing the overall manufacturing cost and maintenance difficulty of the sensor, and at the same time, its wide spectrum characteristics make it have strong adaptability to environmental light changes, and it is suitable for printing, packaging, textile and other cost-sensitive and complex industrial fields. The selection of the two light sources 1 provides a flexible configuration scheme for the deviation correction sensor, which can be adapted according to different application requirements and cost budget, widens the application range of the sensor, and enhances the market competitiveness of the product.

[0036] As a further improvement of the utility model, the wavelength of the divergent light beam emitted by the light source 1 is 650nm. The light beam with a wavelength of 650nm brings many advantages to the deviation correction sensor. The scattering and absorption of 650nm red light in common industrial environments are relatively small, which can maintain good light beam intensity and stability over a long distance, is not easily disturbed by environmental light, and improves the reliability of sensor detection. In terms of material compatibility, the 650nm wavelength has moderate penetrability for most industrial materials, such as plastic film, paper, textiles and the like, which can ensure that the light beam carries effective deviation information when passing through the measured object, and also will not affect the detection effect due to too strong or too weak penetration, and is suitable for various industrial detection scenes. In addition, the wavelength of 650nm is within the safe range of the human eye, and even if the light beam is accidentally exposed during equipment debugging and maintenance, it will not cause serious damage to the vision of the operator, thereby improving the safety of equipment use.

[0037] As a further improvement of the utility model, the turning mirror 3 is a plane mirror. The plane mirror is used as the turning mirror 3, which brings significant advantages for miniaturization and deviation correction sensor. The plane mirror has simple structure, mature manufacturing process, low processing difficulty and controllable cost, which is beneficial to reduce the overall production cost of the sensor, facilitate assembly and debugging in the production process and improve production efficiency. In terms of optical performance, the plane mirror surface is smooth and flat, which can ensure that the light is reflected with high reflectivity, reduce light energy loss and beam distortion, ensure that the parallel light beam still maintains good collimation and stability after turning, and further improve the accuracy and reliability of sensor detection. In addition, the plane mirror has strong stability and is less affected by environmental factors such as temperature and vibration. In the complex and changeable environment of industrial production, it can work stably for a long time, reduce equipment maintenance frequency and maintenance cost, and enhance the applicability of the sensor under different working conditions.

[0038] As a further improvement of the utility model, the photoelectric detector 4 is a linear array CMOS image sensor. By setting the photoelectric detector 4 as a linear array CMOS image sensor, the linear array CMOS image sensor has the characteristics of high resolution and high sensitivity, so that even if the measured object has a slight deviation, the deviation information can be accurately obtained, and the accuracy of sensor detection is significantly improved. The linear array CMOS image sensor can complete a scan in a short time and quickly output an electrical signal, which meets the real-time deviation correction demand of high-speed moving objects and effectively avoids the problem of untimely deviation correction caused by detection delay.

[0039] The technical features of the above embodiments can be combined arbitrarily, and to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0040] The above embodiments only express the preferred implementation of the utility model, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which are within the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A miniaturized deviation sensor, characterized in that, The light source, the Fresnel diffraction mirror, the photodetector and the signal processing module are sequentially arranged along the light path direction; The light source emits a divergent light beam to the Fresnel diffraction mirror, the Fresnel diffraction mirror converts the divergent light beam into a parallel light beam after receiving the divergent light beam and emits the parallel light beam to the photodetector, the photodetector receives the parallel light beam and outputs an electric signal to the signal processing module, and the signal processing module outputs a deviation according to the electric signal.

2. The miniaturized skew sensor of claim 1, wherein: The miniaturized deviation correction sensor further comprises a turning mirror, the turning mirror is arranged between the Fresnel diffraction mirror and the photodetector, the plane where the Fresnel diffraction mirror is located is perpendicular to the plane where the photodetector is located, and the plane where the turning mirror is located forms a 45-degree angle with the plane where the Fresnel diffraction mirror is located and the plane where the photodetector is located, respectively.

3. The miniaturized skew sensor of claim 1, wherein: The Fresnel diffraction mirror comprises oppositely arranged incident and exit surfaces, the incident surface faces the light source, and the incident surface is a smooth plane.

4. The miniaturized skew sensor of claim 3, wherein: The exit surface comprises a central exit area and a plurality of concentric arc-shaped tooth patterns arranged around the central exit area, and the central thickness of the central exit area is 0.59-0.61 mm.

5. The miniaturized skew sensor of claim 4, wherein: The number of tooth patterns is 13, and the tooth depth of the tooth patterns is 0.15-0.25 mm.

6. The miniaturized skew sensor of claim 1, wherein: The optical axis of the light source is coaxial with the optical axis of the Fresnel diffraction mirror.

7. The miniaturized skew sensor of claim 1, wherein: The light source is a laser diode or an LED light source.

8. The miniaturized skew sensor of claim 1, wherein: The wavelength of the divergent light beam emitted by the light source is 650 nm.

9. The miniaturized skew sensor of claim 2, wherein: The turning mirror is a plane mirror.

10. The miniaturized skew sensor of claim 1, wherein: The photodetector is a linear array CMOS image sensor.

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