A light source device

Abstract

The application discloses a light source device, and relates to the technical field of photoelectric sensing. The device comprises a circuit board, a light-emitting chip arranged on the circuit board, a shell connected with the circuit board, and a lens connected with the shell. The light source device provided by the application provides stable support and heat dissipation through the circuit board, uses a small-area light-emitting chip to realize light beam collimation in cooperation with the lens above the chip, and thus the overall size of the device is significantly reduced. The shell encapsulates the chip and the lens, the protection assembly enhances the vibration resistance, the clamping assembly ensures the accurate positioning of the lens to maintain the light beam quality with a small divergence angle, and the sealing assembly is connected with the circuit board and realizes fast and accurate assembly through the cooperation of the clamping teeth and the clamping groove. The structures work together, so that the application has the characteristics of good light beam collimation effect, small divergence angle, high mechanical stability and strong environmental interference resistance while achieving a small size.

Description

Technical Field

[0001] This application relates to the field of photoelectric sensing technology, and in particular to a light source device. Background Technology

[0002] In precision automated equipment, such as microrobot joints or medical surgical instruments, it is necessary to measure the torque exerted on internal transmission components in real time and with high accuracy. Optical torque sensors are one of the key technologies for achieving this function. The basic principle is that when the elastic structure inside the sensor undergoes a slight deformation due to force, it causes displacement of the internal optical components. By detecting the change in the position of a beam of light, the magnitude of the applied torque can be accurately calculated. In this system, a small light source module capable of emitting a high-quality, low-divergence beam is the core component, and its performance directly determines the accuracy and reliability of the sensor's detection.

[0003] However, existing optical torque sensor light source modules face significant challenges in meeting the ever-increasing demand for miniaturization. Traditional solutions typically employ light-emitting diodes (LEDs) or edge-emitting lasers with collimating lenses. This combination has a relatively large axial dimension, often exceeding 4 millimeters, making it difficult to integrate into space-constrained miniature devices. Simplifying the optical structure to reduce size can lead to increased beam divergence angle and decreased spot quality, thereby weakening the sensitivity and accuracy of torque detection. Furthermore, ensuring structural stability and beam pointing stability under complex conditions such as mechanical vibration and temperature changes in miniaturized devices is a problem that existing technologies struggle to solve adequately. Therefore, developing a light source module that can still provide excellent beam performance and high environmental stability in an extremely small size has become a critical technological bottleneck that urgently needs to be overcome in this field. Utility Model Content

[0004] In view of this, this application provides a light source device, the main purpose of which is to solve the technical problem that existing optical torque sensor light source modules cannot provide excellent beam performance and high environmental stability in extremely small sizes.

[0005] This application provides a light source device, including: Circuit board; A light-emitting chip, wherein the light-emitting chip is disposed on the circuit board; A housing, which is connected to the circuit board; A lens, which is connected to the housing.

[0006] In one feasible implementation, the housing includes: The protective component is a hollow column structure; A snap-fit ​​assembly is provided at one end of the protective assembly near the lens; A sealing assembly is disposed at one end of the protective assembly near the circuit board.

[0007] In one feasible implementation, the number of the snap-fit ​​components is multiple, located at the edge of the protective component, and the snap-fit ​​components are arc-shaped.

[0008] In one feasible implementation, the housing further includes: The locking teeth, in several quantities, are provided on the sealing assembly.

[0009] In one feasible implementation, the device further includes: Card slots, the number of which is several, are formed on the circuit board, and the shape of the card slots matches the shape of the card teeth.

[0010] In one feasible implementation, the device further includes: A through hole, which is formed by the protective component and the snap-fit ​​component.

[0011] In one feasible implementation, the through-hole is located within the projected area of ​​the lens, and the light-emitting chip is located within the projected area of ​​the through-hole.

[0012] In one feasible implementation, the device further includes: An aperture assembly is disposed inside the housing.

[0013] In one feasible implementation, the housing is made of opaque plastic.

[0014] In one feasible implementation, the light-emitting chip is connected to the circuit board via flip-chip bonding.

[0015] This application provides a light source device, including: a circuit board; a light-emitting chip disposed on the circuit board; a housing connected to the circuit board; and a lens connected to the housing. The light source device provided by this application utilizes a circuit board for stable support and heat dissipation, and employs a small-area light-emitting chip in conjunction with an upper lens to achieve beam collimation, thus significantly reducing the overall size of the device. The housing encapsulates the chip and lens, its protective components enhance vibration resistance, and the snap-fit ​​components ensure precise lens positioning to maintain beam quality with a small divergence angle. The sealing components connect to the circuit board and achieve rapid and precise assembly through the engagement of snap teeth and slots. Simultaneously, the aperture and opaque material inside the housing effectively suppress stray light. These structures work together to achieve an extremely small size while possessing excellent beam collimation, a small divergence angle, high mechanical stability, and strong resistance to environmental interference.

[0016] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0017] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A schematic diagram of the structure of a light source device provided in an embodiment of this application is shown; Figure 2 This illustration shows an assembly diagram of a light source device provided in an embodiment of this application; Figure 3 A schematic diagram of the structure of the tooth and slot provided in the embodiment of this application is shown; Figure 4 A schematic diagram of the through hole provided in an embodiment of this application is shown; Figure 5 This paper shows a top view of a light source device according to an embodiment of the present application. Figure 6 The diagram shows a bottom view of a light source device according to an embodiment of this application; Figure 7 This paper illustrates a schematic diagram showing the relationship between light intensity and angle of a light source device provided in an embodiment of this application.

[0019] In the picture: 1. Lens; 2. Housing; 3. Light-emitting chip; 4. Circuit board. Detailed Implementation

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In the field of precision measurement, traditional torque sensing technologies, such as strain gauge-based sensors, are gradually showing their limitations in certain cutting-edge applications. For example, in devices with extremely high requirements for space, weight, and interference resistance, such as microrobot joints, precision surgical instruments, or aerospace actuators, traditional sensors may be unable to meet the requirements due to their large size and weight, susceptibility to electromagnetic interference, or signal drift. These applications not only require sensors to be extremely miniaturized to fit into confined spaces, but also demand extremely high measurement accuracy, stability, and reliability. Therefore, the industry urgently needs a new sensing technology that can overcome these limitations. Optical torque sensors are a technological approach developed to address this need. They indirectly measure torque by detecting changes in light signals. Their non-contact measurement characteristic naturally avoids electromagnetic interference problems in electrical signal transmission, making it possible to perform high-precision measurements in complex electromagnetic environments or intrinsically safe environments such as medical settings. This optical-based technological approach opens up new directions for achieving miniaturization, high precision, and high stability of sensors.

[0024] See Figure 1 , Figure 2 , Figure 5 and Figure 6 The diagram shows a structural schematic of a light source device provided in an embodiment of this application, including: Circuit board 4; Light-emitting chip 3 is mounted on circuit board 4; Housing 2, housing 2 is connected to circuit board 4; Lens 1 is connected to housing 2.

[0025] In the above embodiment, the circuit board 4 is a PCB circuit board, the light-emitting chip 3 is a VCSEL chip, the housing 2 is opaque ABS, and the lens 1 is an aspherical microlens made of highly transparent PC material. The lens 1 and the housing 2 are the main optical structures of this application. The circuit board 4 serves as the base of the device, used to support and electrically connect the light-emitting chip 3, and is preferably made of a material with a low coefficient of thermal expansion. The light-emitting chip 3 is mounted on the circuit board 4, and its emitted beam has a native divergence angle of approximately 13° (full angle). The housing 2 covers and is integrated with the circuit board 4 to form a receiving space. The lens 1 is mounted on the housing 2 and is located directly above the light path of the light-emitting chip 3. This basic structure constitutes a complete light source module.

[0026] This application integrates the main optical components into a closed housing 2, providing necessary mechanical protection and environmental isolation for the light-emitting chip 3 and lens 1. The circuit board 4 not only provides electrical connections but also serves as structural support and heat dissipation. The direct connection between lens 1 and housing 2 ensures the stability of the optical path structure, laying the foundation for obtaining high-quality light beams.

[0027] Furthermore, housing 2 includes: The protective component is a hollow column structure; A snap-fit ​​assembly is located at the end of the protective assembly near lens 1. A sealing component is located at one end of the protective component near the circuit board 4.

[0028] In the above embodiment, the protective component serves as the main frame of the housing 2. Its hollow column structure encloses a core accommodating cavity. The sidewalls of the protective component are designed with specific geometric shapes, such as an undulating corrugated structure, to enhance its resistance to mechanical vibration. A snap-fit ​​component is formed at the upper end of the protective component to fix the lens 1. A sealing component is formed at the lower end of the protective component to achieve a sealed connection between the housing 2 and the circuit board 4. These three components together constitute a complete protective unit.

[0029] The protective components form the main structure of the device and determine the overall outline and dimensions of the module. The snap-fit ​​component is specifically used for the precise positioning and fixation of lens 1, ensuring the assembly accuracy of the optical components. The sealing component is responsible for sealing the interface with circuit board 4, together ensuring that the internal core components are protected from external environmental factors such as dust and moisture, thus improving the long-term reliability of the device.

[0030] Furthermore, there are multiple snap-fit ​​components located at the edge of the protective component, and the snap-fit ​​components are arc-shaped.

[0031] In the above embodiment, multiple arc-shaped snap-fit ​​components are circumferentially distributed along the edge of the top of the protective component. These snap-fit ​​components protrude outward to form a ring structure for supporting and securing the lens 1.

[0032] Multiple snap-fit ​​components can apply clamping force evenly from different directions, ensuring that lens 1 is stably fixed in the central position, effectively preventing lens 1 from shifting or loosening under vibration. The arc-shaped design facilitates the insertion and installation of lens 1, while avoiding stress concentration at sharp corners, improving the mechanical strength of the snap-fit ​​parts, and making the assembly process smoother and more reliable.

[0033] See Figure 3 The diagram shows a schematic representation of the toothed and slotted structure provided in an embodiment of this application. Further, the housing 2 also includes: The locking teeth, in several quantities, are located on the sealing assembly.

[0034] In the above embodiment, several retaining teeth are formed on the lower surface of the sealing assembly and extend toward the circuit board 4. These retaining teeth serve as a mechanical connection structure between the housing 2 and the circuit board 4.

[0035] The snap-fit ​​structure provides a simple and effective mechanical connection method. It allows the housing 2 to be quickly and accurately aligned and joined with the circuit board 4, simplifying the assembly process. After connection, the snap-fit ​​provides sufficient holding force, enhancing the robustness of the connection between the housing 2 and the circuit board 4, thereby improving the overall structural integrity of the entire light source device.

[0036] Furthermore, the device also includes: Card slots, there are several card slots, which are formed on the circuit board 4. The shape of the card slots matches the shape of the card teeth.

[0037] In the above embodiment, the circuit board 4 has several slots that conform to the contact surface of the housing 2. The position and shape of these slots correspond one-to-one with the locking teeth on the sealing assembly, so that the locking teeth can be inserted into the slots to achieve interlocking.

[0038] The engagement of the slots and teeth enables rapid and precise positioning and mechanical locking between the housing 2 and the circuit board 4. This design avoids the use of additional fasteners, facilitating a slimmer device. The interlocking structure effectively resists shear forces, preventing the housing 2 and circuit board 4 from easily separating under vibration or impact, thus enhancing the connection stability at the interface.

[0039] See Figure 4 The diagram shows a schematic representation of the through-hole provided in an embodiment of this application. Further, the device also includes: Through hole, which is surrounded by protective component and snap-fit ​​component.

[0040] In the above embodiment, the through-hole is a central channel defined by the capless top of the protective component and the inner edge of the snap-fit ​​component. This through-hole extends vertically through the housing 2, providing an unobstructed path for light propagation.

[0041] The through-hole forms the core channel for beam emission. Its dimensions are precisely designed to ensure that the beam emitted by the light-emitting chip 3 can pass through completely, avoiding unnecessary obstruction, and to cooperate with the aperture assembly of this application to limit the passage of stray light. This is one of the key structures to ensure the quality of the emitted beam.

[0042] Furthermore, the through hole is located within the projection area of ​​lens 1, and the light-emitting chip 3 is located within the projection area of ​​the through hole.

[0043] In the above embodiment, from the axial viewpoint of the light source device, the light-emitting chip 3 is completely within the opening area defined by the through hole. Meanwhile, the lens 1 is large enough to completely cover the entire through hole opening.

[0044] This positional relationship ensures that all light emitted from the light-emitting chip 3 can pass through the aperture and reach the lens 1, while the lens 1 can process the entire beam completely. This guarantees efficient use of light energy and integrity of the beam shape, which is an important prerequisite for achieving a small divergence angle and high-quality collimated beam, and avoids the problem of edge light loss.

[0045] Furthermore, the device also includes: Aperture assembly, which is located inside housing 2.

[0046] In the above embodiments, the aperture assembly is disposed in the internal cavity of the housing 2, specifically at a certain position on the through hole path, such as near the through hole outlet or integrated on the snap-fit ​​assembly, and has a light-limiting hole at its center that is smaller than the through hole.

[0047] The function of the aperture assembly is to further constrain the beam range and block non-main path light rays, i.e. stray light, emitted by the light-emitting chip 3. This helps to reduce diffraction and scattering at the edge of the beam, making the energy of the emitted light spot more concentrated and the outline clearer, thereby improving the accuracy and signal-to-noise ratio of the subsequent optical sensing system when detecting the position of the light spot.

[0048] Furthermore, the shell 2 is made of opaque plastic.

[0049] In the above embodiments, the entire housing 2, including the protective components, the snap-fit ​​components, and the sealing components, is integrally injection molded from opaque plastic material or combined in other ways.

[0050] The housing 2 is made of opaque plastic, which effectively prevents external ambient light from entering the device and interfering with the light-emitting chip 3. It also prevents stray light from leaking from non-through-hole areas due to multiple reflections of internal light on the inner wall of the housing 2. This not only improves resistance to ambient light interference but also helps maintain the purity of the light beam. Furthermore, plastic materials offer advantages such as light weight, ease of processing, low cost, and corrosion resistance.

[0051] Furthermore, the connection between the light-emitting chip 3 and the circuit board 4 is a flip-chip soldering method.

[0052] In the above embodiment, the light-emitting chip 3 is directly mounted on the pads of the circuit board 4 using flip-chip bonding. That is, the active light-emitting surface of the light-emitting chip 3 faces the circuit board 4, and it is directly connected to the corresponding solder points on the circuit board 4 through the bumps on the chip.

[0053] Flip-chip bonding eliminates the need for traditional wire bonding, significantly reducing package height, which is crucial for achieving ultra-thin light source modules. Simultaneously, this connection method shortens electrical paths, benefiting high-frequency performance. More importantly, it provides an efficient heat conduction path from the chip to the circuit board 4, as the active area of ​​the chip is closer to the heat sink, thereby improving the device's heat dissipation performance and enhancing operational stability and lifespan.

[0054] See Figure 7 The diagram shows the relationship between light intensity and angle of a light source device provided in an embodiment of this application. The overall device size of this application is less than or equal to 3 mm. Experiments have shown that after collimation by the aspherical microlens 1, the half-intensity full angle of the light beam emitted by the VCSEL light-emitting chip 3 is less than or equal to 3°.

[0055] This application provides a schematic diagram of a light source device, including: a circuit board 4; a light-emitting chip 3 disposed on the circuit board 4; a housing 2 connected to the circuit board 4; and a lens 1 connected to the housing 2. The light source device provided by this application utilizes the circuit board for stable support and heat dissipation, and employs a small-area light-emitting chip in conjunction with the lens above to achieve beam collimation, thus significantly reducing the overall size of the device. The housing encapsulates the chip and lens, its protective components enhance vibration resistance, the snap-fit ​​components ensure precise lens positioning to maintain beam quality with a small divergence angle, and the sealing components connect to the circuit board and achieve rapid and precise assembly through the engagement of snap teeth and slots. Simultaneously, the aperture and opaque material inside the housing effectively suppress stray light. These structures work together to achieve an extremely small size while possessing excellent beam collimation, a small divergence angle, high mechanical stability, and strong resistance to environmental interference.

[0056] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Those skilled in the art will understand that the modules in the apparatus of the embodiment can be distributed within the apparatus of the embodiment as described, or can be modified to be located in one or more apparatuses different from this embodiment. The modules of the above-described embodiment can be combined into one module, or further divided into multiple sub-modules.

[0057] The serial numbers in this application are for descriptive purposes only and do not represent the superiority or inferiority of any particular implementation scenario. The above disclosures are merely a few specific implementation scenarios of this application; however, this application is not limited thereto, and any variations conceived by those skilled in the art should fall within the protection scope of this application.

Claims

1. A light source device, characterized in that, include: Circuit board (4); A light-emitting chip (3) is disposed on the circuit board (4); Housing (2), which is connected to the circuit board (4); Lens (1), which is connected to the housing (2).

2. The apparatus according to claim 1, characterized in that, The housing (2) includes: The protective component is a hollow column structure; A snap-fit ​​assembly is provided at one end of the protective assembly near the lens (1); A sealing assembly is disposed at one end of the protective assembly near the circuit board (4).

3. The apparatus according to claim 2, characterized in that, The number of the snap-fit ​​components is multiple, and they are located at the edge of the protective component. The snap-fit ​​components are arc-shaped.

4. The apparatus according to claim 2, characterized in that, The housing (2) further includes: The locking teeth, in several quantities, are provided on the sealing assembly.

5. The apparatus according to claim 4, characterized in that, The device further includes: Card slots, the number of which is several, are formed on the circuit board (4), and the shape of the card slots matches the shape of the card teeth.

6. The apparatus according to claim 2, characterized in that, The device further includes: A through hole, which is formed by the protective component and the snap-fit ​​component.

7. The apparatus according to claim 6, characterized in that, The through hole is located within the projected area of ​​the lens (1), and the light-emitting chip (3) is located within the projected area of ​​the through hole.

8. The apparatus according to claim 1, characterized in that, The device further includes: Aperture assembly, wherein the aperture assembly is disposed inside the housing (2).

9. The apparatus according to claim 1, characterized in that, The shell (2) is made of opaque plastic.

10. The apparatus according to claim 1, characterized in that, The connection between the light-emitting chip (3) and the circuit board (4) is flip-chip soldering.

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