Waterproof forehead temperature gun

Abstract

The utility model relates to forehead temperature gun waterproof technical field discloses a waterproof forehead temperature gun, including front shell, rear shell, temperature measurement subassembly and projection positioning component, temperature measurement subassembly is connected with projection positioning component and is commonly laid on the front shell, and the first waterproof structure is laid between the front shell and rear shell, and the second waterproof structure is laid between the front shell and temperature measurement subassembly and projection positioning component, the key is laid on the front shell, and the third waterproof structure is laid between the key and front shell, and / or the key is laid on the rear shell, and the third waterproof structure is laid between the key and rear shell. While guaranteeing the convenience and accuracy of temperature measurement positioning, guaranteeing the sealing waterproof performance, to solve the technical problem that the forehead temperature gun waterproof performance of existing is insufficient, and the environmental adaptability is poor.

Description

Technical Field

[0001] This utility model relates to the field of waterproof forehead thermometer technology, and in particular, to a waterproof forehead thermometer. Background Technology

[0002] Forehead thermometers, as a non-contact infrared temperature measurement device, are widely used in medical settings, public places, and homes for body temperature monitoring due to their advantages such as speed, safety, and hygiene. Traditional forehead thermometers typically use infrared sensors to measure forehead temperature and provide feedback through a display screen or sound.

[0003] Existing forehead thermometers, with increasing demands for convenience and accuracy, have become more complex in structure, incorporating features such as laser-assisted positioning and multiple function buttons. However, the following problems arise in practical use:

[0004] 1. Insufficient waterproofing: The casing of ordinary forehead thermometers is usually not waterproof, making the internal circuit boards and sensors susceptible to moisture or water ingress, which can damage them and affect measurement accuracy and the lifespan of the device. Especially in medical or outdoor environments, sweat, rainwater, or cleaning and disinfecting solutions may seep into the device, causing malfunctions.

[0005] 2. Poor environmental adaptability: In humid, dusty or temperature-different environments, the existing forehead thermometers have insufficient sealing and stability, which may affect the accuracy of temperature measurement and the reliability of the equipment. Utility Model Content

[0006] This invention provides a waterproof forehead thermometer that ensures convenient and accurate temperature measurement and positioning while maintaining a sealed and waterproof performance, thereby solving the technical problems of insufficient waterproof performance and poor environmental adaptability of existing forehead thermometers.

[0007] This utility model provides a waterproof forehead thermometer, including a front shell, a rear shell, a temperature measuring component, and a projection positioning component. The temperature measuring component and the projection positioning component are connected and jointly arranged on the front shell. A first waterproof structure is arranged between the front shell and the rear shell, and a second waterproof structure is arranged between the front shell and the temperature measuring component and the projection positioning component. A button is arranged on the front shell, and a third waterproof structure is arranged between the button and the front shell; and / or a button is arranged on the rear shell, and a third waterproof structure is arranged between the button and the rear shell.

[0008] Furthermore, the projection positioning component includes a lens bracket, and the second waterproof structure includes a lens bracket sealing ring; the lens bracket is connected to the front shell and the lens bracket sealing ring is located between the lens bracket and the front shell, and the lens bracket sealing ring extends from the joint corner between the lens bracket and the front shell to the inner cavity of the front shell to achieve sealing and water stoppage.

[0009] Furthermore, the projection positioning assembly also includes a biconvex lens, a lens sleeve, a plano-convex lens, a projection film, a light-shielding bracket, and an LED. The second waterproof structure also includes a lens sealing ring. The biconvex lens, the lens sleeve, and the plano-convex lens are sequentially installed in the optical path channel of the lens bracket, and the light-shielding bracket is axially pressed against the optical path channel of the lens bracket by the lens sealing ring to achieve axial fixed positioning of the biconvex lens, the lens sleeve, and the plano-convex lens, as well as sealing between the light-shielding bracket and the lens bracket. A projection film is also pressed and fixed between the light-shielding bracket and the lens sealing ring, and the light-shielding bracket covers the LED.

[0010] Furthermore, the temperature measuring component includes a temperature measuring probe and a probe bracket. The temperature measuring probe is installed inside the probe bracket and fixed in the temperature measuring channel of the lens bracket through the probe bracket. The second waterproof structure also includes a sealing ring disposed between the probe bracket and the lens bracket.

[0011] Furthermore, the third waterproof structure uses a silicone sealing ring or silicone button; or the third waterproof structure uses a waterproof sealing membrane, with the button connected to the front or rear shell through the waterproof sealing membrane.

[0012] Furthermore, the waterproof forehead thermometer also includes a display component, the lens of which is attached to the back cover via secondary injection molding or dual-color injection molding.

[0013] Furthermore, the first waterproof structure adopts a stepped fit or a male-female groove fit, and the front shell and the rear shell are connected by a stepped fit or a male-female groove fit and are fixed by a snap fastener.

[0014] Furthermore, the first waterproof structure also includes a sealing ring disposed between the front shell and the rear shell, wherein the sealing ring is disposed at the edge corner or edge groove of the front shell and / or the rear shell.

[0015] Furthermore, the battery compartment is located in an open area enclosed by the front and rear shells and is sealed by a battery door. A fourth waterproof structure is provided between the battery door and the front and rear shells.

[0016] Furthermore, the fourth waterproof structure employs a water-stop groove, which is continuously arranged in a closed loop on the front and rear shells, and the battery door is matched and connected to the water-stop groove; and / or the fourth waterproof structure employs a water-stop strip, which is continuously arranged in a closed loop on the front and rear shells, and the battery door is matched and connected to the water-stop strip; and / or the fourth waterproof structure employs a sealing ring arranged between the battery door and the front and rear shells.

[0017] Furthermore, a rechargeable battery is installed in the closed cavity formed by the front and rear shells, and the charging port of the rechargeable battery is located on the front and / or rear shells and sealed with a waterproof cover.

[0018] This utility model has the following beneficial effects:

[0019] This utility model of a waterproof forehead thermometer forms a multi-layered waterproof barrier system by setting a first waterproof structure between the front and rear shells, a second waterproof structure between the front shell and the temperature measuring component and the projection positioning component, and a third waterproof structure between the button and the front or rear shell. Through this layered waterproof design, each key connection point of the device has independent waterproof capabilities. In particular, the temperature measuring component and the projection positioning component, two precision components, have undergone specialized waterproofing treatment, ensuring both the sealing of the core functional modules and maintaining the overall structural stability of the device. The coordinated operation of these structures effectively blocks the intrusion of liquid through three main seepage paths: the shell seams, the functional component installation points, and the operation button, thereby improving the overall reliability of the forehead thermometer in humid environments. The placement of each waterproof structure targets the weakest points most susceptible to water ingress during actual use, and the technical means directly correspond to the waterproofing problems to be solved, achieving the technical effects of improving the device's environmental adaptability and extending its service life.

[0020] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a waterproof forehead thermometer according to a preferred embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the connection structure between the front shell and the rear shell of a preferred embodiment of the present invention.

[0024] Legend:

[0025] 100. Front housing; 200. Rear housing; 300. Temperature measuring component; 301. Temperature measuring probe; 302. Probe bracket; 400. Projection positioning component; 401. Lens bracket; 402. Biconvex lens; 403. Lens sleeve; 404. Plano-convex lens; 405. Projection film; 406. Light-shielding bracket; 407. LED bead; 500. First waterproof structure; 600. Second waterproof structure; 700. Third waterproof structure; 800. Lens; 900. Clip; 1000. Battery door; 1100. Button. Detailed Implementation

[0026] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0027] Figure 1 This is a schematic diagram of the structure of a waterproof forehead thermometer according to a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the connection structure between the front shell and the rear shell of a preferred embodiment of the present invention.

[0028] like Figure 1 As shown, the waterproof forehead thermometer of this embodiment includes a front shell 100, a rear shell 200, a temperature measuring component 300, and a projection positioning component 400. The temperature measuring component 300 and the projection positioning component 400 are connected and jointly arranged on the front shell 100. A first waterproof structure 500 is arranged between the front shell 100 and the rear shell 200, and a second waterproof structure 600 is arranged between the front shell 100 and the temperature measuring component 300 and the projection positioning component 400. A button (1100) is arranged on the front shell 100, and a third waterproof structure 700 is arranged between the button (1100) and the front shell 100. And / or a button (1100) is arranged on the rear shell 200, and a third waterproof structure 700 is arranged between the button (1100) and the rear shell 200. This utility model of a waterproof forehead thermometer features a first waterproof structure 500 between the front shell 100 and the rear shell 200, forming a sealed barrier for the main body of the device. This blocks external liquids from seeping into the internal circuit area along the shell's joint surface, ensuring the reliability of the core electronic components in humid or splashing environments. A second waterproof structure 600 between the front shell 100 and the temperature measuring component 300 and the projection positioning component 400 seals the assembly interface of the optical and sensing modules, eliminating penetration channels between the sensor window and the shell. This prevents moisture or contaminants from interfering with the infrared temperature measurement optical path and laser positioning accuracy, maintaining the stability of the measurement function. A third waterproof structure 700 between the button and the shell covers the button travel gap through a dynamic sealing mechanism, preventing liquid from entering from the button's moving parts during user operation. This solves the sealing failure problem of silicone buttons caused by repeated pressing in traditional designs. This three-tiered waterproof structure forms a sealing system: the first structure provides device-level protection, the second structure ensures functional module-level sealing, and the third structure addresses the dynamic sealing requirements of the human-machine interface. These three structures work together to improve the overall waterproof performance and environmental adaptability of the forehead thermometer while maintaining its original temperature measurement and positioning functions.

[0029] like Figure 1As shown, in this embodiment, the projection positioning component 400 includes a lens bracket 401, and the second waterproof structure 600 includes a lens bracket sealing ring. The lens bracket 401 is connected to the front shell 100 and the lens bracket sealing ring is located between the lens bracket 401 and the front shell 100. The lens bracket sealing ring extends from the corner where the lens bracket 401 and the front shell 100 meet to the inner cavity of the front shell 100 to achieve sealing and water stoppage. The lens bracket sealing ring is located at the joint corner between the lens bracket 401 and the front housing 100. Through elastic deformation, it fills the assembly gap between the two, blocking the path of external liquid seeping into the inner cavity of the device along the mating interface between the lens bracket 401 and the front housing 100, ensuring the sealing of the optical channel of the projection positioning assembly 400. The layout of the lens bracket sealing ring extending from the joint corner to the inner cavity of the front housing 100 forms a multi-level sealing barrier. Radial sealing achieves static sealing through compression deformation of the joint corner, while the axial sealing extension forms redundant sealing in the inner cavity direction. Even if external liquid breaches the first seal, the extension structure can still prevent further penetration. This sealing design adapts to the installation requirements of the projection positioning assembly 400. The lens bracket 401, as a rigid support, absorbs assembly tolerances through the elastic compensation of the sealing ring, while maintaining the positioning accuracy of optical elements (such as lenses) and avoiding optical axis misalignment introduced by the sealing structure. The coordinated design of the spatial layout of the lens bracket sealing ring and the mechanical connection of the lens bracket 401 solves the problem of optical performance degradation of the projection positioning assembly 400 due to insufficient sealing in humid environments.

[0030] like Figure 1As shown, in this embodiment, the projection positioning assembly 400 further includes a biconvex lens 402, a lens sleeve 403, a plano-convex lens 404, a projection film 405, a light-shielding bracket 406, and an LED bead 407. The second waterproof structure 600 also includes a lens sealing ring. The biconvex lens 402, the lens sleeve 403, and the plano-convex lens 404 are sequentially installed in the optical path channel of the lens bracket 401, and the light-shielding bracket 406 is axially pressed against the optical path channel of the lens bracket 401 by the lens sealing ring to achieve axial fixed positioning of the biconvex lens 402, the lens sleeve 403, and the plano-convex lens 404, as well as sealing between the light-shielding bracket 406 and the lens bracket 401. The projection film 405 is also pressed and fixed between the light-shielding bracket 406 and the lens sealing ring, and the light-shielding bracket 406 covers the LED bead 407. The lens sealing ring serves both axial sealing and positioning functions. It forms an axial compression seal between the light-shielding bracket 406 and the lens bracket 401, and simultaneously compresses the biconvex lens 402, lens sleeve 403, and plano lens 404 through elastic deformation, thus achieving both axial positioning and sealing. It also serves to fix the optical components, ensuring the axial position of each lens is stable within the optical path, preventing lens displacement due to vibration or temperature changes, and maintaining the accuracy of the projection positioning optical path. Furthermore, it achieves interface sealing, preventing external liquids or dust from entering the optical path through the assembly gap between the light-shielding bracket 406 and the lens bracket 401, and protecting the surface cleanliness of the optical components. The light-shielding bracket 406 achieves integrated sealing and optical management. By pressing the lens sealing ring and the projection film 405 together, the light-shielding bracket 406 creates a sealed barrier for the optical path, forming a closed light-shielding structure at the end of the lens group to prevent stray light from interfering with the clarity of the projection positioning. The projection film 405 is elastically fixed to the lens sealing ring by the light-shielding bracket 406, ensuring that the projection film 405 (such as optical images like scales or positioning patterns) is tightly attached to the output end of the optical path, avoiding image blurring or shifting due to loosening and damage caused by rigid positioning. The light-shielding bracket 406 covers the LED beads 407 and isolates them from the external environment, reducing the risk of water vapor or dust contamination to the LED light source. The sequential arrangement and axial clamping design of the biconvex lens 402, lens sleeve 403, and plano-convex lens 404, with the lens sleeve 403 serving as a spacing adjustment structure, ensures focal length matching between the biconvex lens 402 and the plano-convex lens 404, improving the focusing accuracy of laser or projected patterns. The combination of the lens sealing ring and the light-shielding bracket 406 creates a closed optical path within the lens assembly, preventing external humidity or particles from adhering to the lens surface and affecting light transmittance. The integrated design of the axial compression of the lens sealing ring and the light-shielding bracket 406, through the synergistic effect of mechanical clamping and the lens sealing ring, simultaneously solves the problems of positioning stability, environmental sealing, and stray light suppression of optical components.

[0031] like Figure 1As shown, in this embodiment, the temperature measuring component 300 includes a temperature measuring probe 301 and a probe bracket 302. The temperature measuring probe 301 is installed inside the probe bracket 302 and is fixed to the temperature measuring channel of the lens bracket 401 through the probe bracket 302. The second waterproof structure 600 also includes a sealing ring disposed between the probe bracket 302 and the lens bracket 401. The sealing ring disposed between the probe bracket 302 and the lens bracket 401 forms a radial and / or axial compression seal; it can prevent external liquids, moisture or dust from seeping into the temperature measuring channel from the assembly gap between the probe bracket 302 and the lens bracket 401, avoiding signal drift caused by moisture or contamination of the temperature measuring probe 301; the elastic deformation of the sealing ring absorbs the assembly tolerance of the probe bracket 302 and the lens bracket 401, reduces stress concentration caused by rigid connection, and protects the structural stability of the temperature measuring probe 301. The temperature probe 301 is fixed within the temperature measurement channel of the lens bracket 401 via the probe holder 302. The probe holder 302, acting as a mechanical positioning structure, ensures that the infrared receiving surface of the temperature probe 301 is coaxial with the temperature measurement optical path of the lens bracket 401, maintaining consistent distance for non-contact temperature measurement. The tight fit between the probe holder 302 and the lens bracket 401 (pressed by a sealing ring) reduces air gaps and minimizes the impact of ambient temperature fluctuations on the temperature probe 301. The lens bracket 401 integrates both the temperature measurement channel and the projection optical path channel. The sealing rings of the probe holder 302 and the lens sealing ring form a parallel sealing barrier, preventing cross-contamination between the temperature measurement channel and the projection channel (such as heat interference from the projection component). This double-sealed structure creates multiple anti-leakage paths on a single lens bracket 401, improving the reliability of the equipment in complex environments. Through the interface sealing of the sealing ring and the mechanical positioning of the probe holder 302, the environmental tolerance, assembly accuracy, and thermal stability of the temperature measurement component 300 are simultaneously addressed.

[0032] like Figure 1As shown, in this embodiment, the third waterproof structure 700 uses a silicone sealing ring or a silicone button; or the third waterproof structure 700 uses a waterproof sealing membrane, with the button 1100 connected to the front shell 100 or the rear shell 200 through the waterproof sealing membrane. The silicone sealing ring or silicone button, due to its elastic properties, maintains close contact with the shell during repeated pressing of the button 1100, forming a resilient sealing interface that effectively prevents liquid from seeping into the device through the gaps in the button 1100's movement. The silicone button itself acts as a sealing component, eliminating assembly gaps that may occur in the separate structure of the button 1100 and the sealing ring in traditional designs; it achieves structural integration of the button 1100's function and sealing function, simplifying the assembly process. The waterproof sealing membrane forms a continuous and uninterrupted sealing layer between the button 1100 and the shell, completely isolating the contact path between external liquid and internal circuitry; the thin and light nature of the waterproof sealing membrane ensures that the tactile feel of the button 1100 is not significantly affected, maintaining the user's operating experience while ensuring sealing. It can adapt to the design requirements of buttons 1100 of different shapes and sizes, and can effectively compensate for the assembly tolerance between the housing and buttons 1100; it can provide reliable liquid penetration resistance and resist the corrosion of common liquids such as sweat and cleaning agents; the connection method with the front housing 100 or the rear housing 200 maintains the integrity of the overall appearance of the device and does not affect the layout and performance of other functional modules; it provides an effective solution for the waterproofing requirements of the button 1100 part, and improves environmental adaptability while maintaining the operation function of the device.

[0033] like Figure 1 As shown, in this embodiment, the waterproof forehead thermometer also includes a display component. The lens 800 of the display component is connected to the back shell 200 via secondary injection molding or dual-color injection molding. Secondary injection molding / dual-color injection molding creates a molecular-level fusion interface between the lens 800 and the back shell 200, forming an integrated sealed structure. This completely eliminates microscopic gaps that may occur with traditional adhesive or snap-fit ​​assembly; it establishes a seepage barrier, preventing liquid from seeping into the display component along the edge of the lens 800; the injection-molded interface has the same coefficient of thermal expansion as the shell, maintaining the integrity of the interface seal under temperature cycling conditions and resisting the corrosive effects of disinfectants, sweat, and other chemicals; it eliminates stress concentration points in traditional assembly, improves overall impact resistance, avoids seal failure caused by lens 800 loosening under vibration, and ensures optical performance; simultaneously, it ensures precise alignment between the lens 800 and the shell.

[0034] like Figure 1 and Figure 2As shown, in this embodiment, the first waterproof structure 500 adopts a stepped fit or a male-female groove fit. The front shell 100 and the rear shell 200 are connected by a stepped fit or a male-female groove fit and are fixed by a snap fastener 900. The first waterproof structure 500 adopts a stepped fit or a male-female groove fit to form multiple physical barriers; the stepped fit creates at least two orthogonal seepage prevention paths (axial and radial); the male-female groove fit forms a labyrinthine sealing channel, extending the liquid penetration path; the continuous clamping force generated by the snap fastener 900 maintains the pressure on the mating surface, and the elastic interlocking design of the snap fastener 900 and the groove allows for slight deformation without loosening; the physical barrier of the stepped fit or male-female groove fit and the mechanical locking of the snap fastener 900 form a double guarantee. The static seal is achieved by the mating structure, and the dynamic seal is maintained by the elasticity of the snap fastener 900. During assembly, the "click" sound of the snap fastener 900 provides feedback on the positioning.

[0035] like Figure 1 As shown, in this embodiment, the first waterproof structure 500 further includes a sealing ring disposed between the front shell 100 and the rear shell 200. The sealing ring is disposed at the edge corner or edge groove of the front shell 100 and / or the rear shell 200. The sealing ring, together with the stepped or male-female groove of the front shell 100 and the rear shell 200, forms a composite sealing system. The mechanical mating structure provides primary physical barrier, and the sealing ring provides secondary elastic sealing compensation. The placement of the edge corner or groove achieves three-dimensional sealing. The elastic properties of the sealing ring can fill the microscopic unevenness of the mating surface, compensate for dimensional tolerances, and absorb the thermal deformation of the shell. The extended design at the corner prevents the "gap capillary effect" and blocks the liquid from climbing along the curved surface of the corner. The positioning design of the groove can prevent assembly displacement.

[0036] like Figure 1 As shown, in this embodiment, the battery compartment is located in the open area formed by the front shell 100 and the rear shell 200 and is sealed by the battery door 1000. A fourth waterproof structure is provided between the battery door 1000 and the front shell 100 and the rear shell 200. The battery door 1000 forms multiple waterproof interfaces with the front shell 100 and the rear shell 200, including: a compression sealing ring (preferably rectangular cross-section) around the periphery of the battery door 1000, a rotational sealing structure at the hinge shaft (the hinge can also be replaced by a latch), and a secondary compression seal at the latch. The linkage design of the hinge and the latch, or the combined design of multiple latches, ensures that the battery door 1000 automatically generates sealing pressure when the door is closed; optionally, the chamfer design of the sealing ring groove guides the direction of compression deformation to improve the sealing effect. Optionally, a hydrophobic membrane is provided at the bottom of the battery compartment to block the penetration of external liquids.

[0037] like Figure 1As shown, in this embodiment, the fourth waterproof structure adopts a water-stop groove, which is formed on the front shell 100 and the rear shell 200 in a continuous closed loop arrangement, and the battery door 1000 is matched and connected to the water-stop groove; and / or the fourth waterproof structure adopts a water-stop strip, which is formed on the front shell 100 and the rear shell 200 in a continuous closed loop arrangement, and the battery door 1000 is matched and connected to the water-stop strip; and / or the fourth waterproof structure adopts a sealing ring arranged between the battery door 1000 and the front shell 100 and the rear shell 200. A continuous closed-loop water-stop groove is installed on the front shell 100 and the rear shell 200. The battery door 1000 is matched and connected in the water-stop groove. The continuous closed-loop structure of the water-stop groove eliminates the weakness of the joint and forms an uninterrupted liquid barrier path, blocking the channel for external liquid to seep into the battery compartment along the edge of the battery door 1000. The geometric contour of the water-stop groove matches the edge shape of the battery door 1000, ensuring automatic alignment during assembly and avoiding sealing failure due to misalignment. The groove structure can guide the intruded liquid to drain along a preset path, preventing liquid accumulation at the critical sealing interface. A continuous closed-loop water-stop strip is fixed to the front shell 100 and the rear shell 200. The battery door 1000 is pressed against the surface of the water-stop strip. The compression deformation of the water-stop strip fills the microscopic gap between the battery door 1000 and the shell, adapting to surface unevenness and forming a dynamic seal. The elastic water-stop strip absorbs the impact energy when the battery door 1000 is opened and closed or when the equipment is dropped, reducing damage to the sealing structure caused by rigid collisions. The water-stop strip can be made of elastomers with different hardness or chemical resistance (such as silicone strips or fluororubber strips) to adapt to diverse environmental requirements. A sealing ring is arranged between the battery door 1000 and the front shell 100 and the rear shell 200. The elastic deformation of the sealing ring is dynamically adjusted with the locking force of the battery door 1000 to maintain a constant contact pressure and compensate for dimensional changes caused by temperature or mechanical stress. The annular sealing ring provides both radial and axial sealing forces to cope with the risk of liquid penetration in different directions. As an independent component, the sealing ring is easy to replace, extending the overall service life of the battery door 1000 structure. A continuous closed-loop layout eliminates sealing breaks, ensuring the integrity of waterproof performance; it is compatible with the opening and closing motion requirements of the battery door 1000, maintaining sealing effectiveness during dynamic use; ultimately, it blocks liquid penetration paths, ensuring the battery compartment's protection level is consistent with the main body of the equipment. Optionally, a battery is installed inside the battery compartment; the battery is electrically connected to the control board. Optionally, the control board is electrically connected to the temperature sensing component 300, the projection positioning component 400, and the button 1100, respectively.

[0038] like Figure 1As shown, in this embodiment, a rechargeable battery is housed within the closed cavity formed by the front shell 100 and the rear shell 200. The charging port of the rechargeable battery is located on the front shell 100 and / or the rear shell 200 and is sealed with a waterproof cover. The waterproof cover physically seals the charging port, blocking the path for liquid to enter the internal circuitry of the device from the charging interface. The interface between the cover and the shell is sealed through an interference fit or a sealing ring, ensuring the reliability of the charging port in non-use conditions. The rechargeable battery is built into the closed cavity enclosed by the front shell 100 and the rear shell 200, utilizing the main structure of the device as the battery compartment. This avoids increasing the device's size by using an external battery compartment, maintaining the overall compactness of the forehead thermometer. The closed cavity structure isolates the rechargeable battery from the external environment, preventing liquid penetration that could lead to battery short circuits or circuit corrosion, thus improving the safety of the device. The charging port is integrated into the shell, allowing charging without disassembling the battery. The waterproof cover has a reusable opening and closing structure, balancing protective performance and ease of use. Optionally, the rechargeable battery is electrically connected to a control board. Optionally, the control board is electrically connected to the temperature measuring component 300, the projection positioning component 400, and the button 1100.

[0039] In practice, a waterproof forehead thermometer is provided, which can achieve a systematic waterproof effect by setting up components such as a lens sealing ring, a button silicone sealing ring, a lens 800, a front shell 100, a rear shell 200, a lens bracket sealing ring, a probe sealing ring, a silent button sealing ring, and a battery door sealing ring.

[0040] Lens 800 and back cover 200 are connected together through a secondary injection molding or two-color injection molding process. Compared with the traditional adhesive backing method, the assembly is more precise and can also waterproof the lens 800 position. The lens sealing ring is interference-fitted with the lens holder 401. The lens sealing ring is placed on the lower end face of the lens holder 401, and the lens sealing ring is tightly fitted with the flat end of the plano-convex lens 404, which can waterproof the lens position. The mute button sealing ring and the button silicone sealing ring are placed directly below the mute button, the measurement button, and the memory button, respectively. The sealing rings are surrounded by ribs to cover each button 1100 (mute button, measurement button, and memory button). This design prevents external moisture from entering the machine through the gaps in the button 1100. The lens bracket sealing ring is located between the lens bracket 401 and the front shell 100, and the annular rib on the lens bracket sealing ring is press-fitted with the inner surface of the front shell 100 to achieve waterproofing. The probe sealing ring is fitted onto the temperature probe 301 and press-fitted with the annular rib of the probe bracket 302 to achieve waterproofing. The battery door sealing ring is press-fitted into the mounting holes of the rear shell 200 and the battery door 1000, providing a waterproof seal. Additionally, the battery door 1000 has a sound outlet, and a waterproof and breathable membrane is attached to the inside of the sound outlet, providing both sealing and breathability. Through these waterproof components, the entire machine achieves a systematic waterproofing effect.

[0041] A clear projection positioning spot is formed by the projection positioning component 400 (i.e., the sequentially arranged LED beads 407, projection film 405, plano-convex lens 404, biconvex lens 402, and emission element), so that the projection positioning area overlaps with the temperature measurement area. This allows the user to intuitively determine the optimal measurement distance, avoiding temperature measurement errors caused by distance deviations, thus solving the problem of "users having difficulty judging the detection distance" in the prior art. The combined structure of the plano-convex lens 404 and biconvex lens 402, with the plane facing the LED beads 407, is used. The plano-convex lens 404 is responsible for collimating and emitting divergent light to approximately parallel or parallel light, while the biconvex lens 402... It is responsible for focusing / magnifying parallel light, and the two work together to reduce aberrations such as spherical aberration and coma, ensuring the sharpness of the projected light spot edge and avoiding the problem of "image plane curvature causing sensor plane mismatch" in the background technology; it adopts a collaborative combination of plano-convex lens 404 and biconvex lens 402, which makes the processing and assembly more difficult and the light source fixing structure more stable, thereby reducing the production defect rate and solving the defects of "complex assembly of parabolic mirror and unstable light source fixing" in the background technology; while ensuring temperature measurement accuracy, it also takes into account the stability of the optical system and the convenience of user operation, meeting the requirements of high precision and ease of use of non-contact thermometers.

[0042] The angle C between the central axis of the projection positioning component 400 and the central axis of the temperature measuring component 300 is 10°-20°. Optimizing the overlap between the projection and temperature measuring areas, by reasonably controlling the angle C between the optical axes of the two components (10°-20°), ensures that the positioning spot projected by the projection positioning component 400 and the infrared temperature measuring area of ​​the temperature measuring component 300 precisely overlap at the target distance (e.g., 1cm-5cm). This avoids projection offset, temperature measurement deviation, or temperature measurement blind zones caused by excessively high or low parallelism of the optical path, improving the intuitiveness of user alignment and the reliability of measurement. Reducing optical interference, the angle design avoids cross-reflection between the projection optical path and the infrared temperature measuring optical path at internal optical elements or the inner wall of the lens barrel, reducing stray light interference to the infrared sensor, thereby improving the purity and accuracy of the temperature measurement signal. Ergonomically designed with an angle of 10°-20°, this handheld forehead thermometer aligns with the natural usage angle of the device. Users can easily position the temperature sensor directly on their forehead without significantly adjusting their wrist, while visually observing the projected light spot, thus improving operational comfort and measurement efficiency. The angle design strikes a balance between optical performance and user experience, ensuring both accurate projection positioning and temperature measurement while avoiding optical path interference and operational inconvenience.

[0043] The distance 'a' between the center of the convex surface of the biconvex lens 402 facing the plano-convex lens 404 and the center of the convex surface of the plano-convex lens 404 is 5 mm to 10 mm. Controlling the distance 'a' within this range ensures that the approximately parallel light collimated by the plano-convex lens 404 achieves the optimal incident angle on the biconvex lens 402, resulting in a clear and stable focused light spot after passing through the biconvex lens 402. Too small a distance leads to excessive light convergence, increasing spherical aberration; too large a distance reduces light energy utilization and affects projection brightness. When the distance 'a' is controlled within the 5 mm to 10 mm range, the plano-convex lens 404 and the biconvex lens 402 can produce a synergistic effect, effectively compensating for each other's aberrations. The spherical aberration characteristics of the plano-convex lens 404 and the symmetrical refractive characteristics of the biconvex lens 402 work together to reduce the overall spherical aberration and coma of the system, improving the sharpness of the projection edges. By controlling the distance 'a' within the range of 5mm-10mm, the projection positioning component 400 is miniaturized while ensuring optical performance. This keeps the overall structure of the forehead thermometer compact and easy to handle. It avoids the increased size of the thermometer caused by excessively large spacing between optical elements, while also preventing assembly difficulties and optical path interference problems caused by excessively small spacing. Controlling the distance 'a' within the range of 5mm-10mm provides sufficient operating space for lens fixing and adjustment, reducing production assembly difficulty, improving product yield and consistency, and ensuring the stability of the optical system.

[0044] like Figure 1 As shown, the distance b from the light-emitting center of the LED 407 (surface mount LED electrical connection control board) to the center of the plano-convex lens 404 is 15mm-20mm. This distance ensures that the LED 407 is within the effective collimation working distance of the plano-convex lens 404, allowing the diffused light to form a high-quality, nearly parallel beam after passing through the lens. Too close a distance would result in an excessively large beam divergence angle, reducing the collimation effect; too far a distance would decrease light energy utilization, affecting projection brightness. With a distance b of 15mm-20mm, the plano-convex lens 404 can optimally control the shape of the light emitted by the LED 407, forming a clear, uniformly bright central light path, providing ideal optical input conditions for the subsequent focusing / magnification of the biconvex lens 402. The design with a distance b of 15mm-20mm ensures sufficient assembly tolerance while avoiding lens edge effects caused by improper distance, enabling the optical system to maintain stable performance under conditions of temperature changes or mechanical vibration. The 15mm-20mm distance b achieves an optimal balance between light energy collection efficiency and optical performance, fully utilizing the radiant energy of the 407 LED while avoiding thermal interference caused by excessively close proximity.

[0045] like Figure 1As shown, in this embodiment, the outer diameter of the biconvex lens 402 is 6 mm-8 mm, and / or the outer diameter of the plano-convex lens 404 is 7 mm-9 mm. The plano-convex lens 404 has an outer diameter of 7-9 mm, and the biconvex lens 402 has an outer diameter of 6-8 mm. This ensures that the lenses have sufficient aperture to effectively collect and transmit light energy while maintaining a reasonable edge thickness. An outer diameter that is too small will limit the light flux and reduce the projection brightness; an outer diameter that is too large will result in an excessively thin lens edge, affecting structural strength. This design allows the lenses to effectively control the incident angle of edge rays while maintaining an appropriate aperture, thereby suppressing aberrations such as spherical aberration and coma, and improving the overall quality of the projection spot. A balance is struck between optical performance and structural compactness, ensuring sufficient optical performance while allowing the entire projection positioning component 400 to be integrated into the limited space of the forehead thermometer, facilitating product miniaturization. The design conforms to the processing standards of conventional optical lenses, avoiding increased processing difficulty due to excessively small size and material waste due to excessively large size, which helps control production costs and ensure product consistency.

[0046] Any matters not covered in this utility model are common knowledge.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A waterproof forehead thermometer, comprising a front shell (100), a rear shell (200), a temperature measuring component (300), and a projection positioning component (400), wherein the temperature measuring component (300) and the projection positioning component (400) are connected and jointly disposed on the front shell (100), characterized in that, A first waterproof structure (500) is provided between the front shell (100) and the rear shell (200), and a second waterproof structure (600) is provided between the front shell (100) and the temperature measuring component (300) and the projection positioning component (400). A button (1100) is provided on the front cover (100), and a third waterproof structure (700) is provided between the button (1100) and the front cover (100); and / or A button (1100) is provided on the back cover (200), and a third waterproof structure (700) is provided between the button (1100) and the back cover (200).

2. The waterproof forehead thermometer according to claim 1, characterized in that, The projection positioning assembly (400) includes a lens holder (401), and the second waterproof structure (600) includes a lens holder sealing ring; The lens bracket (401) is connected to the front shell (100) and the lens bracket sealing ring is located between the lens bracket (401) and the front shell (100). The lens bracket sealing ring extends from the corner where the lens bracket (401) and the front shell (100) meet into the inner cavity of the front shell (100) to achieve sealing and water stop.

3. The waterproof forehead thermometer according to claim 2, characterized in that, The projection positioning assembly (400) also includes a biconvex lens (402), a lens sleeve (403), a plano-convex lens (404), a projection film (405), a light-shielding bracket (406), and an LED (407). The second waterproof structure (600) also includes a lens sealing ring. A biconvex lens (402), a lens sleeve (403), and a plano-convex lens (404) are sequentially installed in the optical path channel of the lens holder (401). The light shielding bracket (406) is axially pressed onto the optical path channel of the lens holder (401) by the lens sealing ring, so as to achieve axial fixed positioning of the biconvex lens (402), the lens sleeve (403), and the plano-convex lens (404) and the sealing between the light shielding bracket (406) and the lens holder (401). A projection film (405) is also pressed and fixed between the light-shielding bracket (406) and the lens sealing ring, and the light-shielding bracket (406) covers the lamp bead (407).

4. The waterproof forehead thermometer according to claim 3, characterized in that, The temperature measuring assembly (300) includes a temperature measuring probe (301) and a probe bracket (302). The temperature measuring probe (301) is installed in the probe bracket (302) and connected and fixed in the temperature measuring channel of the lens bracket (401) through the probe bracket (302). The second waterproof structure (600) also includes a sealing ring disposed between the probe holder (302) and the lens holder (401).

5. The waterproof forehead thermometer according to claim 1, characterized in that, The third waterproof structure (700) uses a silicone sealing ring for the button or a silicone button; or The third waterproof structure (700) uses a waterproof sealing membrane, and the button (1100) is connected to the front shell (100) or the rear shell (200) through the waterproof sealing membrane.

6. The waterproof forehead thermometer according to claim 1, characterized in that, The waterproof forehead thermometer also includes a display component, the lens (800) of which is attached to the back cover (200) by secondary injection molding or dual-color injection molding.

7. The waterproof forehead thermometer according to any one of claims 1 to 6, characterized in that, The first waterproof structure (500) adopts a stepped fit or a male and female groove fit. The front shell (100) and the rear shell (200) are connected by a stepped fit or a male and female groove fit and are fixed by a snap fastener (900).

8. The waterproof forehead thermometer according to claim 7, characterized in that, The first waterproof structure (500) also includes a sealing ring disposed between the front shell (100) and the rear shell (200), the sealing ring being disposed at the edge corner or edge groove of the front shell (100) and / or the rear shell (200).

9. The waterproof forehead thermometer according to any one of claims 1 to 6, characterized in that, The battery compartment is located in an open area enclosed by the front shell (100) and the rear shell (200) and is sealed by the battery door (1000). A fourth waterproof structure is provided between the battery door (1000) and the front shell (100) and the rear shell (200).

10. The waterproof forehead thermometer according to claim 9, characterized in that, The fourth waterproof structure employs a water-stop groove, which is continuously arranged in a closed loop on the front shell (100) and rear shell (200). The battery door (1000) is matched and connected to the water-stop groove; and / or The fourth waterproof structure employs a waterstop strip, which is installed on the front shell (100) and the rear shell (200) in a continuous closed loop arrangement. The battery door (1000) is matched and connected to the waterstop strip; and / or The fourth waterproof structure uses a sealing ring placed between the battery door (1000) and the front shell (100) and the rear shell (200).

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