Near-infrared light emitting assembly and emitting probe
By adjusting the optical coupling level and current voltage between the LED light-emitting element and the light guide in the near-infrared light emitting component, the problem of adjusting the light output parameters in the prior art is solved, achieving more efficient light output power and lower cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DANYANG HUICHUANG MEDICAL EQUIP CO LTD
- Filing Date
- 2025-03-12
- Publication Date
- 2026-04-17
AI Technical Summary
Existing near-infrared light emitting components have difficulty in effectively adjusting light output parameters to meet different inspection needs. In particular, it is difficult to match the light output parameters of different wavelengths of light by adjusting the voltage and current of the light-emitting diode.
Design a near-infrared light emitting component, comprising at least two LED light-emitting elements. By adjusting the optical coupling level and current voltage between each LED light-emitting element and the light guide, ensure that the light output parameters of the two wavelengths of light output meet the inspection requirements.
It achieves a wider range of optical output parameters, increases optical output power, reduces costs, and simplifies the packaging process.
Smart Images
Figure CN224125949U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of near-infrared optical imaging and detection system technology, specifically to a near-infrared light emitting component and an emitting probe. Background Technology
[0002] Functional near-infrared spectroscopy (fNIRS) is a mature, non-destructive testing technique that can non-invasively detect tissue oxygenation. It is a commonly used and effective method for obtaining brain oxygenation signals from the cerebral cortex. Near-infrared spectroscopy devices emit near-infrared light in the 700-900 nm range. This light penetrates the scalp and skull to reach the cerebral cortex, where sensors collect the near-infrared light scattered by the cortex, thus achieving the detection purpose.
[0003] The near-infrared light emitting component includes a light source and a light guide. Taking a typical examination method as an example, during the examination, two different wavelengths of infrared light need to be emitted towards the subject's head. Oxyhemoglobin has an absorption peak for one type of infrared light, and deoxyhemoglobin has an absorption peak for the other. By comparing the intensity of the two types of infrared light scattered from the brain to the receiver, the brain's blood oxygenation status within the detection range can be determined. Therefore, at least two wavelengths of light source are required. The light source uses a light-emitting diode (LED), and the light guide conducts the near-infrared light emitted by the LED to the subject's head.
[0004] During the inspection process, it is necessary to adjust the light output parameters of different wavelengths of light emitted from the light guide. Commercially available near-infrared spectroscopy equipment adjusts the light output parameters by changing the voltage and current of the light-emitting diodes (LEDs) to ensure that the output wavelengths meet the inspection requirements. However, this method alone is insufficient for some inspection needs. Utility Model Content
[0005] To ensure that the light output parameters of the near-infrared light emitting component meet inspection requirements, this application provides a near-infrared light emitting component, including at least two LED light-emitting elements, each LED light-emitting element configured to emit near-infrared light of different wavelengths; and a light guide, which has a light incident surface disposed opposite to the plurality of light-emitting elements for receiving the near-infrared light of different wavelengths emitted by each LED light-emitting element. The light coupling level between the first LED light-emitting element and the light incident surface of the light guide is greater than the light coupling levels between the other LED light-emitting elements and the light incident surfaces of the light guide. By increasing the light coupling level between the first LED light-emitting element and the light guide, or decreasing the light coupling level between the second LED light-emitting element and the light guide, the light output parameters of the two wavelengths of light output from the light guide can be made the same, or the light output parameters of the two wavelengths of light output from the light guide can be made different, thereby meeting different inspection requirements. Furthermore, the current and voltage of the first and second LED light-emitting elements can be adjusted to make the light output parameter range greater than that of existing near-infrared light emitting components, for example, having a higher output light power at a certain wavelength than existing near-infrared light emitting components.
[0006] In some embodiments, the projected area of the first LED light-emitting element along the longitudinal direction on the light-incident surface of the light guide is greater than the projected area of each of the other LED light-emitting elements along the longitudinal direction on the light-incident surface of the light guide.
[0007] In some embodiments, the main body of the light guide is cylindrical, the light-incident surface of the light guide is located on the end face of the main body, and the at least two LED light-emitting elements further include a second LED light-emitting element arranged side by side with the first LED light-emitting element in the transverse direction, wherein: in the transverse direction, the center distance between the first LED light-emitting element and the light-incident surface is smaller than the center distance between the second LED light-emitting element and the light-incident surface.
[0008] In some embodiments, the wavelengths of the near-infrared light emitted by the first LED light-emitting element and the second LED light-emitting element are selected from different values within the following range: 700-900nm.
[0009] In some embodiments, the main body of the light guide is cylindrical, the light-incident surface of the light guide is located on the end face of the main body, and the at least two LED light-emitting elements further include a second LED light-emitting element and a third LED light-emitting element. The first LED light-emitting element, the second LED light-emitting element and the third LED light-emitting element are arranged in a triangular pattern in the transverse direction, and the projection of the first LED light-emitting element in the longitudinal direction falls completely within the light-incident surface of the light guide.
[0010] In some embodiments, the main body of the light guide is cylindrical, and the light-incident surface of the light guide is located on the end face of the main body. The at least two LED light-emitting elements further include a second LED light-emitting element and a third LED light-emitting element. The first LED light-emitting element, the second LED light-emitting element, and the third LED light-emitting element are arranged in a triangular pattern in the transverse direction. In the transverse direction, the center distance between the first LED light-emitting element and the light-incident surface is smaller than the center distance between the second LED light-emitting element and the light-incident surface and the center distance between the third LED light-emitting element and the light-incident surface.
[0011] In some embodiments, the coverage of the incident light surface by the projection of each LED light-emitting element in the longitudinal direction is associated with the light output parameters of each LED light-emitting element, such that the coverage of the first LED light-emitting element with light output parameters inferior to other LED light-emitting elements is greater than the coverage of other LED light-emitting elements.
[0012] In some embodiments, the wavelengths of the first LED light-emitting element, the second LED light-emitting element, and the third LED light-emitting element are selected from different values within the range of 700-900nm.
[0013] In some embodiments, at least two LED light-emitting elements are optically coupled to the light-incident surface of the light guide via at least one of air and light-guiding adhesive.
[0014] According to a second aspect of this application, a transmitting probe is provided, the transmitting probe including a housing, a light-emitting hole provided on a first side of the housing; and the aforementioned near-infrared light emitting component, wherein: at least two LED light-emitting elements of the near-infrared light emitting component are disposed inside the housing; and the light-emitting surface of the light guide is exposed outside the housing through the light-emitting hole.
[0015] This utility model description introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.
[0016] The advantages and features of this application are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0017] The following drawings, which are incorporated herein by reference and are used to understand this application, illustrate embodiments of the invention and their descriptions to explain the principles of the invention. In the drawings,
[0018] Figure 1 A three-dimensional view showing the packaged LED light-emitting element in conjunction with the light guide component is shown;
[0019] Figure 2A schematic diagram of an LED light-emitting element and package according to an embodiment of this application is shown;
[0020] Figure 3 A schematic diagram of an LED light-emitting element and package according to another embodiment of this application is shown;
[0021] Figure 4 A schematic diagram of an LED light-emitting element and package according to yet another embodiment of this application is shown.
[0022] The above figures include the following reference numerals:
[0023] 10. Circuit board; 20. Packaged LED light-emitting element; 21. LED light-emitting element; 211. First LED light-emitting element; 212. Second LED light-emitting element; 213. Third LED light-emitting element; 30. Light guide column; 31. Light-incident surface; 32. Light-emitting surface. Detailed Implementation
[0024] In the following description, numerous details are provided to enable a thorough understanding of this application. However, those skilled in the art will appreciate that the following description merely illustrates preferred embodiments of the application, and that the application can be implemented without one or more of these details. Furthermore, to avoid confusion with this application, some technical features well-known in the art have not been described in detail.
[0025] This application provides a near-infrared light emitting component, which includes at least two LED light-emitting elements, each LED light-emitting element being configured to emit near-infrared light of different wavelengths. Figure 1 A perspective view of the packaged LED light-emitting element and light guide in conjunction is shown. In this embodiment, the chip can be glued to a substrate, electrically connected to electrode pins via gold wire bonding, and encapsulated with a material such as epoxy resin. The packaged LED light-emitting element 20 chip can be easily mounted onto the circuit board 10 and can withstand certain vibrations and external pressure. The near-infrared light emitting assembly may further include a light guide 30, which has a light-incident surface disposed opposite to multiple light-emitting elements for receiving near-infrared light of different wavelengths emitted by each LED light-emitting element. Figure 2The arrangement of LED light-emitting elements 21 within the packaged LED light-emitting element 20 is shown, with the circle in the figure representing the light-incident surface 31 of the light guide 30. At least two LED light-emitting elements 21 may include a first LED light-emitting element 211 and a second LED light-emitting element 212. The light coupling level between the first LED light-emitting element 211 and the light-incident surface of the light guide 30 is greater than the light coupling levels between the other LED light-emitting elements 21 and the light-incident surface of the light guide 30. For ease of understanding, the following detailed description uses an embodiment of a near-infrared light emitting assembly including two LED light-emitting elements 21 as an example. Each of the plurality of LED light-emitting elements 21 can be packaged individually; or the plurality of LED light-emitting elements 21 can be packaged together. For ease of understanding, the following detailed description uses an embodiment employing LED light-emitting elements 21 emitting two wavelengths as an example. The light-emitting surface of the LED light-emitting element 21 faces the light-incident surface 31 of the light guide 30.
[0026] For the LED light-emitting element 21, the emitted light has a certain divergence angle, which makes the area of the light spot formed on the plane further away from the LED light-emitting element 21 larger. Taking a common LED light-emitting element 21 as an example, the emitted light diffuses in a cone shape with the normal to its surface as the center, and the center of the light spot and the center of the LED light-emitting element 21 are located on a straight line perpendicular to its surface. Ideally, the light-incident surface 31 is in contact with the surface of the LED light-emitting element 21, and the projection of the LED light-emitting element 21 on the light-incident surface 31 is almost the same as the area of the light spot. In actual products, the LED light-emitting element 21 is encapsulated, and there is a certain gap between the light-incident surface 31 and the surface of the LED light-emitting element, so that the light emitted by the LED light-emitting element 21 forms a light spot on the light-incident surface 31 that may be larger than its own projected area. However, in general, for LED light-emitting elements 21 at the same distance from the light-incident surface 31, the larger the projected area of the LED light-emitting element 21 on the light-incident surface 31, the larger the area of the light spot formed on the light-incident surface 31. The term "larger projection area" as used here refers to the area of the projection falling on the light-incident surface 31. Specifically, for example, an embodiment in which the entire projection falls on the light-incident surface 31 can be considered to have a larger projection area than an embodiment in which half of the projection falls on the light-incident surface 31. The term "larger light spot area" is similar to the term "larger projection area" mentioned above.
[0027] The optical coupling level can be considered as the efficiency of light coupling from the LED light-emitting element 21 to the light guide 30. As mentioned above, the light emitted by the LED light-emitting element 21 has a certain divergence angle, causing a portion of the light spot to fall outside the light-incident surface 31. It should be noted that a portion of the light spot falling outside the light-incident surface 31 means that the light spot on the plane of the light-incident surface 31 does not completely overlap with the light-incident surface 31. The light spot falling inside the light-incident surface 31 refers to the part of the light spot that overlaps with the light-incident surface 31, and the light spot falling outside the light-incident surface 31 refers to the part of the light spot that does not overlap with the light-incident surface 31. In addition, when light shines on the light-incident surface 31, a portion of the light is reflected by the light-incident surface 31 and fails to enter the light-incident surface 31. Of the light that enters the light-incident surface 31, a portion cannot be reflected when it shines on the side wall of the light guide 30 due to the angle, thus leaking to the outside of the light guide 30. Another portion of the light is reflected in an undesirable direction and cannot effectively reach the designated area of the subject's brain via the light guide 30. In summary, since LED light-emitting elements 21 of different wavelengths have different divergence angles and different positional relationships between LED light-emitting elements 21 and incident surface 31, these factors will affect the level of optical coupling.
[0028] In the first embodiment, the overlap between the light spot of the first LED light-emitting element 211 and the light-incident surface 31 is greater than the overlap between the light spot of the second LED light-emitting element 212 and the light-incident surface 31. This allows most, or even all, of the light emitted by the first LED light-emitting element 211 to enter the light-incident surface 31, while only a portion of the light emitted by the second LED light-emitting element 212 illuminates areas outside the light-incident surface 31, with only a partial portion entering the light-incident surface 31. This results in different amounts of light entering the light-incident surface 31 from the first LED light-emitting element 211 and the second LED light-emitting element 212, leading to different levels of light coupling. Specifically, the first LED light-emitting element 211 may be closer to the center of the light-incident surface 31 than the second LED light-emitting element 212, or the surface of the first LED light-emitting element 211 may be closer to the light-incident surface 31 than the surface of the second LED light-emitting element 212.
[0029] As described above, in embodiments where the sidewall of the light guide 30 does not have a reflective layer, after the light from the LED light-emitting element 21 enters the light-receiving surface 31, a portion will leak out of the light guide 30 from its sidewall. The closer the center of the light spot of the LED light-emitting element 21 is to the edge of the light guide 30, the more light leaks out of the light guide 30 from the light-receiving surface 31. In the second embodiment, the light spots of the first LED light-emitting element 211 and the second LED light-emitting element 212 on the plane of the light-receiving surface 31 can all fall within the light-receiving surface 31, and the distance between the center of the light spot of the first LED light-emitting element 211 and the center of the light-receiving surface 31 is closer than the distance between the center of the light spot of the second LED light-emitting element 212 and the center of the light-receiving surface 31. In this way, after the light from the first LED light-emitting element 211 enters the light-receiving surface 31, most of the light can be reflected back into the light guide 30 through the side wall of the light guide 30, and the amount of light leaking out of the light guide 30 is relatively small; while after the light from the second LED light-emitting element 212 enters the light-receiving surface 31, a larger amount of light leaks out of the light guide 30, resulting in different levels of light coupling between the first LED light-emitting element 211 and the second LED light-emitting element 212 and the light guide 30.
[0030] In the third embodiment, a lens may be disposed between the first LED light-emitting element 211 and the light-incident surface 31, or an anti-reflection film may be disposed on the light-incident surface 31 at least at the position corresponding to the light spot of the first LED light-emitting element 211, or a medium may be filled between the first LED light-emitting element 211 and the light-incident surface 31 to reduce the reflection of light on the light-incident surface 31, so that more light emitted by the first LED light-emitting element 211 can be coupled into the light guide 30. In the fourth embodiment, a lens may also be disposed between the second LED light-emitting element 212 and the light-incident surface 31, or an anti-reflection film may be disposed on the light-incident surface 31 at least at the position corresponding to the light spot of the second LED light-emitting element 212, so that less light emitted by the second LED light-emitting element 212 is coupled into the light guide 30.
[0031] In the above embodiments, by increasing the optical coupling level between the first LED light-emitting element 211 and the light guide 30, or decreasing the optical coupling level between the second LED light-emitting element 212 and the light guide 30, the optical output parameters of the two wavelengths of light output from the light guide 30 can be made the same, or the optical output parameters of the two wavelengths of light output from the light guide 30 can be made different, thereby meeting different inspection needs. Based on this, the current and voltage of the first LED light-emitting element 211 and the second LED light-emitting element 212 can be further adjusted, thereby making the range of optical output parameters greater than that of existing near-infrared light emitting components, for example, having a higher output optical power at a certain wavelength than existing near-infrared light emitting components.
[0032] As described above, the light-emitting surface of the LED faces the light-incident surface 31 of the light guide 30. In the embodiment of the near-infrared light emitting assembly shown in the figure, the LED light-emitting element 21 and the light-incident surface 31 of the light guide 30 are arranged along the longitudinal direction of the light guide 30. Since the larger the light spot area formed, the farther away from the surface of the LED light-emitting element 21, for ease of understanding, the following detailed description uses an embodiment where the surface of the first LED light-emitting element 211 and the surface of the second LED light-emitting element 212 are at the same distance from the light-incident surface 31 as an example.
[0033] In the transverse direction perpendicular to the longitudinal direction, the center of the first LED light-emitting element 211 and the center of the light-incident surface 31 can have a first distance D1, and the center of the second LED light-emitting element 212 and the center of the light-incident surface 31 can have a second distance D2. In one specific embodiment, the first LED light-emitting element 211 and the second LED light-emitting element 212 have the same size, and their longitudinal projections both fall on the light-incident surface 31. Optionally, the first distance D1 can be smaller than the second distance D2. When the light-incident surface 31 is a centrally symmetrical shape, such as a circle or a prism, a smaller portion of the light spot of the first LED light-emitting element 211 may fall outside the light-incident surface 31, or even the light spot may fall entirely within the light-incident surface 31. Meanwhile, a larger area of the light spot of the second LED light-emitting element 212 falls outside the light-incident surface 31, and this portion of light is not coupled to the light guide 30. This results in the first LED light-emitting element 211 and the second LED light-emitting element 212 having different levels of light coupling.
[0034] In another specific embodiment, the first LED light-emitting element 211 and the second LED light-emitting element 212 also have the same size, and their longitudinal projections both fall within the light-incident surface 31. Furthermore, the first distance D1 and the second distance D2 can be the same. For the first LED light-emitting element 211 and the second LED light-emitting element 212, the divergence angle of the light from the first LED light-emitting element 211 can be smaller than the divergence angle of the second LED light-emitting element 212, such that on the light-incident surface 31, the area of the light spot formed by the first LED light-emitting element 211 is smaller than the area of the light spot formed by the second LED light-emitting element 212, and:
[0035] The light spot of the first LED light-emitting element 211 on the light-incident surface 31 falls entirely on the light-incident surface 31, while a portion of the light spot of the second LED light-emitting element 212 falls outside the light-incident surface 31, or
[0036] Both the first LED light-emitting element 211 and the second LED light-emitting element 212 have a portion of their light spots falling outside the light-emitting surface 31, and the area of the light spot of the first LED light-emitting element 211 falling outside the light-emitting surface 31 is smaller than the area of the light spot of the second LED light-emitting element 212 falling outside the light-emitting surface 31.
[0037] In both of the above cases, the light coupling level between the first LED light-emitting element 211 and the light-incident surface 31 is higher than that between the second LED light-emitting element 212 and the light-incident surface 31.
[0038] In some embodiments, the first LED light-emitting element 211 and the second LED light-emitting element 212 are at different distances from the light-incident surface 31 along the longitudinal direction.
[0039] Continue to refer to Figure 2 In another specific embodiment, the projected area of the first LED light-emitting element 211 along the longitudinal direction on the light-incident surface 31 of the light guide 30 is larger than the projected area of each of the other LED light-emitting elements 21 along the longitudinal direction on the light-incident surface 31 of the light guide 30. Under this premise, two cases can be discussed: the first LED light-emitting element 211 and the second LED light-emitting element 212 have the same size, or the first LED light-emitting element 211 and the second LED light-emitting element 212 have different sizes.
[0040] In one embodiment of the near-infrared light emitting assembly, the first LED light-emitting element 211 and the second LED light-emitting element 212 have the same size. In this case, there are two possible configurations:
[0041] 1) The projection of the first LED light-emitting element 211 onto the light-incident surface 31 along the longitudinal direction is entirely within the light-incident surface 31, while a portion of the projection of the second LED light-emitting element 212 onto the light-incident surface 31 along the longitudinal direction falls outside the light-incident surface 31.
[0042] 2) The projections of the first LED light-emitting element 211 and the second LED light-emitting element 212 falling on the light-incident surface 31 along the longitudinal direction are both partially located outside the light-incident surface 31, and the projection area of the first LED light-emitting element 211 falling outside the light-incident surface 31 is smaller than the projection area of the second LED light-emitting element 212 falling outside the light-incident surface 31.
[0043] As described above, the projected area of the LED light-emitting element 21 on the light-incident surface 31 of the light guide 30 along the longitudinal direction is related to the area of the light spot formed by the LED light-emitting element 21 on the light-incident surface 31. Therefore, if the divergence angle of the first LED light-emitting element 211 is approximately the same as the divergence angle of the LED light-emitting element 21, the light coupling level between the light-incident surface 31 and the first LED light-emitting element 211 can be guaranteed to be higher.
[0044] In one embodiment of the near-infrared light emitting assembly, the first LED light-emitting element 211 and the second LED light-emitting element 212 have different dimensions. For example... Figure 3As shown, when the size of the first LED light-emitting element 211 is larger than that of the second LED light-emitting element 212, a portion of the projections of both LEDs onto the light-incident surface 31 along the longitudinal direction are located outside the light-incident surface 31, and the projected area of the first LED light-emitting element 211 onto the light-incident surface 31 is larger than the projected area of the first LED light-emitting element 211 onto the light-incident surface 31. Alternatively, the entire projection of the first LED light-emitting element 211 onto the light-incident surface 31 is located within the light-incident surface 31, and the entire or partial projection of the second LED light-emitting element 212 onto the light-incident surface 31 is located within the light-incident surface 31. In another case, the size of the first LED light-emitting element 211 is smaller than that of the second LED light-emitting element 212, the entire or partial projection of the first LED light-emitting element 211 onto the light-incident surface 31 is located within the light-incident surface 31, and the partial projection of the second LED light-emitting element 212 onto the light-incident surface 31 is located within the light-incident surface 31, such that the projected area of the first LED light-emitting element 211 onto the light-incident surface 31 is larger than the projected area of the first LED light-emitting element 211 onto the light-incident surface 31. In summary, the above scheme ensures that the projected area of the first LED light-emitting element 211 on the light-incident surface 31 is larger than that of the second LED light-emitting element 212 on the light-incident surface 31. This guarantees that a larger proportion of the light spot of the first LED light-emitting element 211 falls within the light-incident surface 31 than the light spot of the second LED light-emitting element 212, resulting in a higher level of light coupling between the first LED light-emitting element 211 and the light-incident surface 31. This satisfies the needs of different inspections.
[0045] Continue to refer to Figure 2 For example, the main body of the light guide 30 is cylindrical, and the light-incident surface 31 of the light guide 30 is located on the end face of the main body. The cylindrical shape of the light guide 30 prevents sharp edges from forming on its sides, allowing light entering the light-incident surface 31 to be better transmitted to the other side and reducing leakage from the light guide 30. The first LED light-emitting element 211 and the second LED light-emitting element 212 can be arranged side-by-side laterally. Laterally, the center distance between the first LED light-emitting element 211 and the light-incident surface 31 is smaller than the center distance between the second LED light-emitting element 212 and the light-incident surface 31. In other words, the first distance D1 is smaller than the second distance D2, thereby resulting in a higher level of light coupling between the first LED light-emitting element 211 and the light-incident surface 31. This method allows the two LED light-emitting elements 21 to be packaged on a base with the same plane, simplifying the packaging process and reducing costs.
[0046] For example, the wavelengths of the near-infrared light emitted by the first LED light-emitting element 211 and the second LED light-emitting element 212 are selected from different values within the range of 700-900 nm. Near-infrared light in this wavelength range has good penetration into the scalp and skull, and many key substances in the cerebral cortex have absorption peaks for near-infrared light in this range. Therefore, the activity of the cerebral cortex can be detected by the corresponding near-infrared light. For example, the oxygen supply to the brain can be obtained by analyzing oxyhemoglobin and deoxyhemoglobin.
[0047] For example, for a light guide 30 whose main body is cylindrical, the light incident surface 31 of the light guide 30 can be located on the end face of the main body. Figure 4 As shown, at least two LED light-emitting elements 21 also include a second LED light-emitting element 212 and a third LED light-emitting element 21. The first LED light-emitting element 211, the second LED light-emitting element 212, and the third LED light-emitting element 213 are arranged in a triangular pattern in the transverse direction. The light-incident surface 31 located on the end face of the main body is circular. The LED light-emitting elements 21 are usually constructed as rectangles, and due to limitations in the packaging process, there is a certain gap between the three LEDs. Arranging the three LED light-emitting elements 21 in a triangular pattern ensures that each LED light-emitting element 21 has sufficient light to illuminate the light-incident surface 31, guaranteeing the lower limit of the light coupling level between each LED light-emitting element 21 and the light-incident surface 31. The projection of the first LED light-emitting element 211 in the longitudinal direction falls completely within the light-incident surface 31 of the light guide 30, thereby ensuring that the first LED light-emitting element 211 has the maximum light coupling level with the light-incident surface 31.
[0048] For example, the wavelengths of the first LED light-emitting element 211, the second LED light-emitting element 212, and the third LED light-emitting element 213 are selected from different values within the range of 700-900nm. By setting multiple LED light-emitting elements 21 within this wavelength range, more diverse inspection needs can be met, or the accuracy of the inspection can be improved.
[0049] In the embodiment described above, which features three LED light-emitting elements 21 arranged in a triangular pattern, the center-to-center distance between the first LED light-emitting element 211 and the light-incident surface 31 is smaller in the lateral direction than the center-to-center distances between the second LED light-emitting element 212 and the light-incident surface 31, and between the third LED light-emitting element 213 and the light-incident surface 31. Similar to near-infrared light emitting components using two LED light-emitting elements 21, the light spot of the first LED light-emitting element 211, which has a smaller center-to-center distance from the light-incident surface 31 in the lateral direction, can fall on the light-incident surface 31 by a larger proportion, achieving a higher level of light coupling. For the second LED light-emitting element 212 and the third LED light-emitting element 213, a similar arrangement can be used to change their light coupling levels with the light-incident surface 31, while ensuring the light coupling level of the first LED light-emitting element 211. This method allows all three LED light-emitting elements 21 to be packaged on a base on the same plane, simplifying the packaging process and reducing costs.
[0050] For example, the coverage of the projection of each LED light-emitting element 21 onto the light-incident surface 31 in the longitudinal direction is associated with the light output parameters of each LED light-emitting element 21, such that the coverage of the first LED light-emitting element 211, whose light output parameters are inferior to those of other LED light-emitting elements 21, is greater than the coverage of the other LED light-emitting elements 21. The light output parameters include light output power. In some embodiments, the first LED light-emitting element 211 can be the light-emitting element with the lowest light output power, and the coupling efficiency between the first LED light-emitting element 211 and the light-incident surface 31 is the highest, allowing the light guide 30 to receive almost all the light output power of the light-emitting element with the lowest light output power. The second LED light-emitting element 212 can be the light-emitting element with the highest light output power, and the light guide 30 can receive a portion of the light output power of the light-emitting element with the highest light output power. In some inspection scenarios, it is necessary to ensure that both wavelengths of light output from the light guide 30 have sufficiently high light output power. With the above configuration, it is not necessary to increase the light output power of the first LED light-emitting element 211 to ensure that the light power received by the light guide 30 meets the requirements. This not only improves the problem of severe heat generation caused by excessive light output power of the light source, but also reduces costs.
[0051] Exemplarily, at least two LED light-emitting elements 21 are optically coupled to the light-incident surface 31 of the light guide 30 via at least one of air and light-guiding adhesive. Air and light-guiding adhesive can have different coupling coefficients. Specifically, due to the difference in refractive index between the encapsulation of the LED light-emitting element 21 surface, the light-incident surface 31, and air, light is reflected and refracted at the interface of the different media. By appropriately setting the gap between the light-emitting element and the light guide 30, a light coupling level that meets inspection requirements can be achieved. In some embodiments, light-guiding adhesive can be filled between the LED light-emitting element 21 and the light-incident surface 31. The light-guiding adhesive has a higher refractive index than air, thus reducing the reflection of light on the encapsulation surface of the LED light-emitting element 21 and the light-incident surface 31. In summary, by selecting a suitable medium between the LED light-emitting element 21 and the light-incident surface 31, the level of light coupling between the light-emitting element and the light-incident surface 31 can be changed. On the other hand, in some embodiments, air is used as a medium between the LED light-emitting element 21 and the light-incident surface 31. This allows for easy separation of the LED light-emitting element 21 from the light guide 30 during maintenance, absorbs installation tolerances, reduces assembly difficulty, and prevents the light guide from damaging the LED light-emitting element 21 due to tolerance issues. Furthermore, this gap prevents the light guide 30 from being damaged by external forces during use. In other embodiments, the LED light-emitting element 21 is bonded to the light-incident surface 31 using light-guiding adhesive. Under external force, the surface distance between the light-incident surface 31 and the LED light-emitting element 21 remains unchanged, ensuring constant output light parameters.
[0052] This application also provides a transmitting probe, which may include a housing with a light-emitting hole on a first side. The transmitting probe may further include the aforementioned near-infrared light emitting component, wherein at least two LED light-emitting elements 21 of the near-infrared light emitting component are disposed within the housing, and the light-emitting surface 32 of the light guide 30 is exposed outside the housing via the light-emitting hole. During examination, the light-emitting hole can be placed against the subject's scalp or connected to components such as optical fibers to output near-infrared light of multiple wavelengths coupled through the light guide 30 to the subject's head, or output to the subject's head after being converted via optical fibers or other components. The transmitting probe using the aforementioned near-infrared light emitting component at least includes the technical effects described in the above embodiments, and will not be repeated here.
[0053] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front", "back", "up", "down", "left", "right", "horizontal", "vertical", "horizontal", "top", and "bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0054] For ease of description, relative terms such as "above," "over," "on the upper surface of," and "above" are used here to describe the regional positional relationship of one or more components or features shown in the figures to other components or features. It should be understood that relative terms include not only the orientation of the component as depicted in the figure but also different orientations during use or operation. For example, if the components in the figures are inverted as a whole, "above" or "above other components or features" will include cases where the component is "below" or "under" other components or features. Thus, the exemplary term "above" can include both "above" and "below." Furthermore, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this document intends to include all such cases.
[0055] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, parts, components, and / or combinations thereof.
[0056] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.
[0057] This application has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit this application to the scope of the described embodiments. Furthermore, those skilled in the art will understand that this application is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this application, all of which fall within the scope of protection claimed in this application. The scope of protection of this application is defined by the appended claims and their equivalents.
Claims
1. A near-infrared light emitting assembly, characterized in that, The near-infrared light emitting component includes: At least two LED light-emitting elements, each LED light-emitting element is configured to emit near-infrared light of different wavelengths; and A light guide has a light incident surface, which is disposed opposite to the at least two LED light-emitting elements and is used to receive near-infrared light of different wavelengths emitted by each LED light-emitting element. The light coupling level between the first LED light-emitting element and the light incident surface of the light guide is greater than the light coupling level between the other LED light-emitting elements and the light incident surface of the light guide.
2. The near-infrared light emitting assembly of claim 1, wherein, The projected area of the first LED light-emitting element on the light-incident surface of the light guide along the longitudinal direction is greater than the projected area of each of the other LED light-emitting elements on the light-incident surface of the light guide along the longitudinal direction.
3. The near infrared light emitting assembly according to claim 1, wherein The main body of the light guide is cylindrical, and the light-incident surface of the light guide is located on the end face of the main body. The at least two LED light-emitting elements further include a second LED light-emitting element arranged side by side with the first LED light-emitting element in the transverse direction, wherein: in the transverse direction, the center distance between the first LED light-emitting element and the light-incident surface is smaller than the center distance between the second LED light-emitting element and the light-incident surface.
4. The near-infrared light emitting assembly according to claim 3, wherein The wavelengths of the near-infrared light emitted by the first LED light-emitting element and the second LED light-emitting element are selected from different values within the following range: 700-900nm.
5. The near infrared light emitting assembly according to claim 1, wherein, The main body of the light guide is cylindrical, and the light-incident surface of the light guide is located on the end face of the main body. The at least two LED light-emitting elements further include a second LED light-emitting element and a third LED light-emitting element. The first LED light-emitting element, the second LED light-emitting element and the third LED light-emitting element are arranged in a triangular shape in the horizontal direction. The projection of the first LED light-emitting element in the vertical direction falls completely within the light-incident surface of the light guide.
6. The near infrared light emitting assembly according to claim 1, wherein, The main body of the light guide is cylindrical, and the light-incident surface of the light guide is located on the end face of the main body. The at least two LED light-emitting elements further include a second LED light-emitting element and a third LED light-emitting element. The first LED light-emitting element, the second LED light-emitting element, and the third LED light-emitting element are arranged in a triangular pattern in the transverse direction, wherein: in the transverse direction, the center distance between the first LED light-emitting element and the light-incident surface is smaller than the center distance between the second LED light-emitting element and the light-incident surface and the center distance between the third LED light-emitting element and the light-incident surface.
7. The near infrared light emitting assembly according to claim 1, wherein The projection of each LED light-emitting element in the longitudinal direction is associated with the coverage of the incident light surface and the light output parameters of each LED light-emitting element, such that the coverage of the first LED light-emitting element, whose light output parameters are inferior to those of other LED light-emitting elements, is greater than the coverage of other LED light-emitting elements.
8. The near-infrared light emitting assembly according to claim 5 or 6, wherein The wavelengths of the first LED light-emitting element, the second LED light-emitting element, and the third LED light-emitting element are selected from different values within the following range: 700-900nm.
9. The near infrared light emitting assembly according to claim 1, wherein, The at least two LED light-emitting elements are optically coupled to the light-incident surface of the light guide via at least one of air and light-guiding adhesive.
10. A launch probe, characterized by, The transmitting probe includes: The outer casing, wherein a light-emitting hole is provided on a first side of the outer casing; and The near-infrared light emitting component as described in any one of claims 1-9, wherein: The at least two LED light-emitting elements of the near-infrared light emitting assembly are disposed within the housing; and The light-emitting surface of the light guide is exposed outside the housing through the light-emitting hole.