Photoelectric sensor
By using a white light-near-infrared broadband beam and an achromatic lens made of optical plastic, combined with a dichroic filter to separate the beam, the problem of inaccurate detection in photoelectric sensors due to object color and distance is solved, achieving higher detection accuracy and cost-effectiveness.
Patent Information
- Application Number
- CN202520214156.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-02-11
AI Technical Summary
Existing photoelectric sensors often fail to detect colors accurately when the object is dark or the distance between the object and the sensor affects the amount of light received. Furthermore, the lens structure may also affect the amount of light, leading to inaccurate color detection.
An achromatic lens made of white light-near-infrared broadband beam and optical plastic is used to converge the beam and separate the beam using a dichroic filter. The light signals of different wavelengths are then processed separately by a photosensitive element.
It eliminates the influence of the distance between the object and the sensor on the amount of light, improves the accuracy of color detection, and reduces costs through injection molding, making structural assembly easier.
Smart Images
Figure CN223925838U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of optoelectronic technology, and in particular to an optoelectronic sensor. BACKGROUND
[0002] In industrial scenarios, an optoelectronic sensor is often required for color detection. With the continuous expansion of the field of intelligent manufacturing, the application of optoelectronic sensors gradually develops in the direction of diversification of detection and complication of perceived information. According to market research results, in the industrial automation industries of secondary batteries, photovoltaics, semiconductors, 3C, and F&C, using an optoelectronic sensor to detect the color of an object is a very widespread demand. When an optoelectronic sensor performs color detection, a light projection element is used to project a light beam onto an object, a light receiving element is used to receive light reflected by the object, and the color of the object is identified by detecting the wavelength of the light reflected by the object.
[0003] It should be noted that the above introduction to the technical background is only to facilitate a clear and complete description of the technical solutions of the present application, and to facilitate the understanding of those skilled in the art. The above technical solutions cannot be considered as known to those skilled in the art merely because they are described in the background section of the present application. CONTENT OF THE INVENTION
[0004] The inventors have found that in existing optoelectronic sensors for color detection, a light projection element uses a white light-emitting diode (LED) to project white light, and a light receiving element uses an RGB photo-diode (PD) to receive light reflected by an object to identify the color of the object. However, the light reflected by the object received by the light receiving element is affected by the color of the object itself. For example, if the color of the object itself is dark, the amount of light received by the light receiving element is small, which affects the accuracy of color detection. The distance between the object and the optoelectronic sensor also affects the amount of light received by the light receiving element, thereby making color detection inaccurate. In addition, the lens structure of the optoelectronic sensor itself can also affect the amount of light received by the light receiving element.
[0005] To solve at least one of the above problems or other similar problems, an embodiment of the present application provides an optoelectronic sensor.
[0006] According to an aspect of an embodiment of the present application, an optoelectronic sensor is provided, wherein the optoelectronic sensor comprises:
[0007] a light projection substrate carrying a light projection element, the light projection element projecting a white light (RGB)-near-infrared light (NIR) wide spectrum light beam;
[0008] The light-emitting substrate is provided with a light-emitting element capable of emitting a white light (RGB)-near-infrared light (NIR) wide spectrum light beam.
[0009] The light-receiving substrate is provided with a light-sensing element capable of obtaining the white light (RGB)-near-infrared light (NIR) wide spectrum light beam reflected by the object and converting the wide spectrum light beam into an electric signal.
[0010] In some embodiments, the white light (RGB)-near-infrared light (NIR) wide spectrum light beam has a wavelength range of 400-1000 nanometers, wherein the white light has a wavelength range of 400-700 nanometers, and the near-infrared light has a wavelength range of 700-1000 nanometers.
[0011] In some embodiments, the photoelectric sensor further comprises a light-receiving lens capable of converging the white light (RGB)-near-infrared light (NIR) wide spectrum light beam reflected by the object and projecting the wide spectrum light beam onto the light-sensing element.
[0012] In some embodiments, the light-receiving lens has a double cemented structure.
[0013] In some embodiments, the light-receiving substrate comprises a first light-receiving substrate and a second light-receiving substrate,
[0014] The first light-receiving substrate is provided with a first light-sensing element capable of obtaining the white light (RGB) light beam reflected by the object and converting the white light beam into an electric signal.
[0015] The second light-receiving substrate is provided with a second light-sensing element capable of obtaining the near-infrared (NIR) light beam reflected by the object and converting the near-infrared light beam into an electric signal.
[0016] In some embodiments, the photoelectric sensor further comprises a dichroic filter capable of separating the white light beam and the near-infrared light beam from the white light (RGB)-near-infrared light (NIR) wide spectrum light beam refracted by the light-receiving lens and projecting the white light beam and the near-infrared light beam onto the first light-sensing element and the second light-sensing element, respectively.
[0017] In some embodiments, the photoelectric sensor further comprises a bracket for fixing the light-emitting substrate, the light-emitting achromatic lens, the light-receiving substrate, and the light-receiving lens.
[0018] In some embodiments, the light-emitting substrate includes a first light-emitting substrate and a second light-emitting substrate. The first light-emitting substrate is equipped with a first light-emitting element, which projects a white light (RGB) beam. The second light-emitting substrate is equipped with a second light-emitting element, which projects a near-infrared light (NIR) beam.
[0019] In some embodiments, the achromatic projection lens converges the white light (RGB) beam projected by the first projection element and the near-infrared light (NIR) beam projected by the second projection element.
[0020] One of the beneficial effects of this application embodiment is that by using a white light-near-infrared broadband beam and an achromatic lens made of optical plastic, the influence of the distance between the object and the photoelectric sensor on the amount of light can be eliminated, and the color of the object can be accurately distinguished. In addition, the use of an achromatic lens made of optical plastic allows the achromatic lens to be injection molded, which can create a complex structure that matches the structure of the photoelectric sensor, making assembly easier and saving costs.
[0021] Specific embodiments of this application are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of this application can be adopted. It should be understood that the embodiments of this application are not limited in scope. Within the spirit and scope of the appended claims, embodiments of this application include many changes, modifications, and equivalents.
[0022] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.
[0023] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description
[0024] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:
[0025] Figure 1 This is a schematic diagram of a photoelectric sensor according to an embodiment of this application;
[0026] Figure 2This is another schematic diagram of the photoelectric sensor according to an embodiment of this application.
[0027] The attached figures are labeled as follows:
[0028] 10: Photoelectric sensor; 11: Light-receiving lens; 12: Dichroic filter; 13: Support;
[0029] 20: Light projection substrate; 21: Light projection component;
[0030] 30: Achromatic projection lens;
[0031] 40: Light-receiving substrate; 41: Photosensitive element. Detailed Implementation
[0032] Referring to the accompanying drawings, the foregoing and other features of this application will become apparent from the following description. Specific embodiments of this application are specifically disclosed in the description and drawings, illustrating partial implementations in which the principles of this application may be employed. It should be understood that this application is not limited to the described embodiments; rather, it includes all modifications, variations, and equivalents falling within the scope of the appended claims.
[0033] In the embodiments of this application, the terms "first," "second," "upper," "lower," etc., are used to distinguish different elements by their names, but do not indicate the spatial arrangement or temporal order of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one or more of the terms listed in connection with the application and all combinations thereof. The terms "comprising," "including," "having," etc., refer to the presence of the stated features, elements, components, or assemblies, but do not exclude the presence or addition of one or more other features, elements, components, or assemblies.
[0034] In the embodiments of this application, the singular forms "a," "the," etc., may include the plural forms and should be broadly interpreted as "a kind" or "a class" rather than limited to the meaning of "an." Furthermore, the term "the" should be understood to include both the singular and plural forms unless the context explicitly indicates otherwise. Additionally, the term "according to" should be understood as "at least partially based on…," and the term "based on" should be understood as "at least partially based on…," unless the context explicitly indicates otherwise.
[0035] The embodiments of this application will now be described with reference to the accompanying drawings.
[0036] This application provides a photoelectric sensor for detecting the color of an object.
[0037] Figure 1 This is a schematic diagram of a photoelectric sensor according to an embodiment of this application.
[0038] likeFigure 1 As shown, the photoelectric sensor 10 includes a light-emitting substrate 20, which is equipped with a light-emitting element 21, which projects a broadband beam of white light (RGB)-near infrared light (NIR).
[0039] The achromatic projection lens 30 is made of optical plastic and has a double-bonded structure. It can converge the broadband beam of white light (RGB)-near infrared light (NIR) projected by the projection element 21, and the achromatic projection lens 30 can eliminate chromatic aberration.
[0040] The light-receiving substrate 40 is equipped with a photosensitive element 41, which acquires a broadband beam of white light (RGB)-near infrared light (NIR) reflected by an object and converts the broadband beam into an electrical signal.
[0041] According to the embodiments of this application, by using a white light-near-infrared broadband beam and an achromatic lens made of optical plastic, the influence of the distance between the object and the photoelectric sensor on the amount of light can be eliminated, and the color of the object can be accurately distinguished. In addition, the use of an achromatic lens made of optical plastic allows the achromatic lens to be injection molded, which can create a complex structure that matches the structure of the photoelectric sensor, making assembly easier and saving costs.
[0042] In the embodiments of this application, such as Figure 1 As shown, the light-projecting element 21 projects a white light-near-infrared beam, that is, the beam projected by the light-projecting element 21 is a mixture of white light and near-infrared (NIR) light. This increases the amount of light projected by the light-projecting element 21, expands the wavelength range of the beam, improves the amount of light received by the photoelectric sensor 10, and more accurately detects the color of the object.
[0043] In some embodiments, the wavelength range of the white light-near-infrared broadband beam is 400-1000 nm, wherein the wavelength range of white light in the broadband beam is 400-700 nm, and the wavelength range of near-infrared light is 700-1000 nm. This expands the wavelength range of the beam projected by the projection element 21, making color detection more accurate. Furthermore, determining the wavelength range of different lights within the broadband beam facilitates the photoelectric sensor's management of the wavelengths of different beams within the projected broadband beam. In this embodiment, there are no limitations on the wavelength range of the broadband beam or the wavelength range of different lights within it; the wavelengths of different beams can be set according to specific needs, as long as the projection element projects a white light-near-infrared broadband beam.
[0044] In the above embodiments, such as Figure 1As shown, the photoelectric sensor 10 has a projection achromatic lens 30, which can converge the broadband beam projected by the projection element 21 and project the converged beam into a specific size or shape according to specific needs, and project it onto the object. Furthermore, the projection achromatic lens 30 has a cemented doublet structure, that is, the projection achromatic lens 30 consists of two lenses. The broadband beam is converged through the refraction of the two lenses and projected onto the object to be detected. This reduces the chromatic aberration of the projected light and further improves the accuracy of the reflected light from the object. For the specific structure of the projection achromatic lens 30, refer to the existing technology related to cemented doublet lenses; this application will not elaborate further.
[0045] Furthermore, in some examples, the projection achromatic lens 30 is made of optical plastic, such as polymethyl methacrylate (PMMA) and polycarbonate. Thus, by using optical plastic to make the projection achromatic lens 30, for photoelectric sensors with different structures, the projection achromatic lens 30 can be injection molded to form a structure that matches the photoelectric sensor, or made into other complex structures to improve the adaptability of the projection achromatic lens 30. In addition, optical plastic is cheaper than traditional glass materials, thus saving costs.
[0046] In the above embodiments, the optical plastic may also be a combination of other similar low-dispersion and high-dispersion materials, such as a combination of PMMA and polystyrene (PS), or a combination of copolymers of cycloolefins (COC) and polycarbonate, and this application does not impose any limitations.
[0047] Figure 2 This is another schematic diagram of the photoelectric sensor according to an embodiment of this application.
[0048] In some embodiments, such as Figure 2 As shown, the light-emitting substrate 20 includes a first light-emitting substrate 20(a) and a second light-emitting substrate 20(b). The first light-emitting substrate 20(a) is equipped with a first light-emitting element 21(a), which projects a white light (RGB) beam. The second light-emitting substrate 20(b) is equipped with a second light-emitting element 21(b), which projects a near-infrared light beam.
[0049] In some embodiments, such as Figure 2 As shown, the achromatic projection lens 30 converges the white light beam projected by the first projection element 21(a) and the near-infrared light beam projected by the second projection element 21(b).
[0050] In the above embodiments, such as Figure 2 As shown, the first projection element 21(a) and the second projection element 21(b) project white light and near-infrared light beams respectively. The white light beam and the near-infrared light beam are then combined by the dichroic filter 12, and the combined beam is projected onto the projection achromatic lens 30. The projection achromatic lens 30 focuses the combined beam onto the object. That is, the projection achromatic lens 30 projects a white light-near-infrared broadband beam onto the object. Thus, by projecting white light beam and near-infrared light beam respectively through two projection elements, the wavelength accuracy of the projected beam can be further improved, thereby improving the accuracy of color detection, and facilitating the adjustment of the wavelength of different beams.
[0051] In some examples, such as Figure 2 As shown, the first projection element 21(a) projects a white light beam, and the second projection element 21(b) projects a near-infrared light beam. This application is not limited to this; the first projection element 21(a) may also project a near-infrared light beam, and the second projection element 21(b) may project a white light beam. In addition, the positions of the first projection element 21(a) and the second projection element 21(b) may also be adjusted according to the position of the projection achromatic lens 30 and other structures. This application does not impose any restrictions.
[0052] According to the above embodiments, the light-projecting substrate 20 and the light-projecting element 21 can project a white light-near infrared broadband beam with a wavelength range of 400-1000 nanometers, thereby increasing the amount of light projected onto the object, improving the wavelength range of the beam projected onto the object, and improving the accuracy of object color detection.
[0053] In some embodiments, such as Figure 1 As shown, the photoelectric sensor 10 also includes a light-receiving lens 11, which can converge a broadband beam of white light-near infrared light reflected by the object and project the broadband beam onto the photosensitive element.
[0054] like Figure 1 As shown, the broadband beam projected by the projection element 21 is focused onto the object by the projection achromatic lens 30. After being reflected by the object, the reflected broadband beam is focused by the receiving lens 11 and projected onto the photosensitive element 41 of the receiving substrate 40. The photosensitive element 41 can receive and acquire the R, G, B light and near-infrared light in the reflected broadband beam, and convert the obtained light into an electrical signal, thereby detecting the color of the object.
[0055] In some embodiments, the light-receiving lens 11 has a doublet structure and is capable of eliminating chromatic aberration. This doublet structure can refer to the doublet structure in the above-described achromatic projection lens 30 and existing technologies; this application does not impose limitations. Furthermore, in some examples, similarly, the light-receiving lens 11 can also be made of optical plastic, and the specific material selection can also refer to the manufacturing materials in the above-described achromatic projection lens 30.
[0056] In some embodiments, such as Figure 1 As shown, the light-receiving substrate 40 includes a first light-receiving substrate 40(a) and a second light-receiving substrate 40(b). The first light-receiving substrate is equipped with a first photosensitive element 41(a), which acquires a white light (RGB) beam reflected by an object and converts the white light beam into an electrical signal. The second light-receiving substrate 40(b) is equipped with a second photosensitive element 41(b), which acquires a near-infrared beam reflected by an object and converts the near-infrared beam into an electrical signal.
[0057] In some embodiments, such as Figure 1 As shown, the dichroic filter 12 in the photoelectric sensor 10 separates the white light beam and the near-infrared light beam from the white light-near-infrared broadband beam refracted by the light-receiving lens 11, and projects the white light beam and the near-infrared light beam onto the first photosensitive element 41(a) and the second photosensitive element 41(b), respectively.
[0058] In the above embodiments, such as Figure 1 As shown, when a broadband beam of light is reflected by an object and then converged by a light-receiving lens 11, a dichroic filter 12 separates a white light beam from the broadband beam refracted by the light-receiving lens 11 and projects the white light beam onto a first photosensitive element 41(a). The first photosensitive element 41(a) receives the R, G, and B light quantities in the white light beam and converts them into electrical signals. The dichroic filter 12 separates a near-infrared light beam from the broadband beam refracted by the light-receiving lens 11 and projects the near-infrared light beam onto a second photosensitive element 41(b). The second photosensitive element 41(b) receives the NIR light quantity in the near-infrared light beam and converts it into an electrical signal. The photoelectric sensor processes the electrical signals corresponding to the white light and the electrical signals corresponding to the near-infrared light, respectively. Thus, beams of different wavelengths are processed separately, enabling more accurate detection of the color of the object.
[0059] In the above embodiments, with Figure 1For example, the first photosensitive element 41(a) receives a white light beam, and the second photosensitive element 41(b) receives a near-infrared light beam. This application is not limited to this. The first photosensitive element 41(a) can also receive a near-infrared light beam, and the second photosensitive element 41(b) can receive a white light beam. The position of the photosensitive element 41 can also be adjusted according to the position of the dichroic filter 12 and the light-receiving lens 11. This application does not impose any restrictions.
[0060] In some embodiments, such as Figure 1 As shown, the photoelectric sensor 10 also includes a bracket 13, which fixes the light-projecting substrate 20, the light-projecting achromatic lens 30, the light-receiving substrate 40, and the light-receiving lens 11.
[0061] Therefore, by using the bracket 13 to fix the structure in the photoelectric sensor 10, the relative positional shift between the structures can be prevented, thus avoiding light crosstalk.
[0062] In the embodiments of this application, Figure 1 and Figure 2 These components can be implemented in combination. That is, in the photoelectric sensor 10, the light-emitting substrate 20 may include a first light-emitting substrate 20(a) and a second light-emitting substrate 20(b), the light-emitting element 21 may include a first light-emitting element 21(a) and a second light-emitting element 21(b), and / or, correspondingly, the light-receiving substrate 40 may include a first light-receiving substrate 40(a) and a second light-receiving substrate 40(b), and the photosensitive element 41 may include a first photosensitive element 41(a) and a second photosensitive element 41(b). Correspondingly, both the portion of the light-emitting substrate 20 and the portion of the light-receiving substrate 40 in the photoelectric sensor 10 may include a dichroic filter 20 to combine and separate the white light beam and the near-infrared light beam.
[0063] In some embodiments, the photoelectric sensor of this application can be applied to a color detection device, or to other products in other fields; this application does not impose any limitations.
[0064] The above description only covers the photoelectric sensor related to this application. The photoelectric sensor may also include other components, which can be found in relevant technologies. The details are omitted here.
[0065] Through the above embodiments, by using a white light-near-infrared broadband beam and an achromatic lens made of optical plastic, the influence of the distance between the object and the photoelectric sensor on the amount of light can be eliminated, and the color of the object can be accurately distinguished. In addition, the use of an achromatic lens made of optical plastic allows the achromatic lens to be injection molded, which can create a complex structure that matches the structure of the photoelectric sensor, making assembly easier and saving costs.
[0066] This application also provides a color detection device, which includes the photoelectric sensor described in the foregoing embodiments. Since the photoelectric sensor has been described in detail in the foregoing embodiments, it will not be described again here.
[0067] The embodiments of this application have been described above with reference to specific implementation methods. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make various modifications and variations to the embodiments of this application based on the spirit and principles of the embodiments, and these modifications and variations are also within the scope of the embodiments of this application.
[0068] Preferred embodiments of the present application have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are apparent from this detailed description, and therefore the appended claims are intended to cover all such features and advantages falling within the true spirit and scope of these embodiments. Furthermore, since many modifications and alterations will readily occur to those skilled in the art, the embodiments of the present application are not intended to be limited to the precise structures and operations illustrated and described, but rather to encompass all suitable modifications and equivalents falling within their scope.
Claims
1. A photoelectric sensor, characterized in that, The photoelectric sensor includes: A light-projecting substrate, which is equipped with a light-projecting element that projects a broadband beam of white light (RGB) to near-infrared light (NIR); The light-projecting achromatic lens, made of optical plastic and having a double-bonded structure, is capable of converging a broadband beam of white light (RGB)-near-infrared light (NIR) projected by the light-projecting element; A light-receiving substrate is equipped with a photosensitive element, which acquires the broadband beam of white light (RGB)-near-infrared light (NIR) reflected by an object and converts the broadband beam into an electrical signal.
2. The photoelectric sensor according to claim 1, characterized in that, The wavelength range of the white light (RGB)-near-infrared light (NIR) broadband beam is 400-1000 nanometers, wherein the wavelength range of white light in the broadband beam is 400-700 nanometers, and the wavelength range of near-infrared light is 700-1000 nanometers.
3. The photoelectric sensor according to claim 1, characterized in that, The photoelectric sensor also includes: The light-receiving lens is capable of converging a broadband beam of white light (RGB)-near-infrared light (NIR) reflected by the object and projecting the broadband beam onto the photosensitive element.
4. The photoelectric sensor according to claim 3, characterized in that, The photoelectric sensor also includes: A bracket is used to fix the light-projecting substrate, the light-projecting achromatic lens, the light-receiving substrate, and the light-receiving lens.
5. The photoelectric sensor according to claim 3, characterized in that, The light-receiving lens has a double-cemented structure.
6. The photoelectric sensor according to claim 1, characterized in that, The light-receiving substrate includes a first light-receiving substrate and a second light-receiving substrate. The first light-receiving substrate is equipped with a first photosensitive element, which acquires a beam of white light (RGB) reflected by the object and converts the white light beam into an electrical signal; The second light-receiving substrate is equipped with a second photosensitive element, which acquires the near-infrared (NIR) beam reflected by the object and converts the near-infrared beam into an electrical signal.
7. The photoelectric sensor according to claim 6, characterized in that, The photoelectric sensor also includes: A dichroic filter separates the white light beam and the near-infrared light beam from the broadband white light (RGB)-near-infrared light (NIR) beam refracted by the light-receiving lens, and projects the white light beam and the near-infrared light beam onto the first photosensitive element and the second photosensitive element, respectively.
8. The photoelectric sensor according to claim 1, characterized in that, The light-projecting substrate includes a first light-projecting substrate and a second light-projecting substrate, The first light-projecting substrate is equipped with a first light-projecting element, which projects a white light (RGB) beam. The second light-emitting substrate is equipped with a second light-emitting element, which projects a near-infrared (NIR) light beam.
9. The photoelectric sensor according to claim 8, characterized in that, The achromatic light-projecting lens converges the white light (RGB) beam projected by the first light-projecting element and the near-infrared light (NIR) beam projected by the second light-projecting element.