Dustproof structure and head-up display

Abstract

The utility model discloses a dustproof structure and head-up display, dustproof structure includes casing, dustproof light transmission film and air jet pipe. The upper end surface of casing is equipped with light outlet and annular welding rib, and the annular welding rib is around light outlet. Dustproof light transmission film covers the upper end surface of casing and blocks light outlet, and dustproof light transmission film is attached to annular welding rib, and dustproof light transmission film is fixed with casing by ultrasonic welding of annular welding rib, so that dustproof light transmission film and casing are relatively fixed. The upper end surface of casing is installed with air jet pipe, and the air inlet end of air jet pipe is connected with gas source, and the air outlet of air jet pipe faces dustproof light transmission film. The annular welding rib is fused by ultrasonic welding to make dustproof light transmission film and casing relatively fixed, and the function of sealing light outlet is simultaneously played, and the welding mode is high in efficiency and strong in sealing property, avoids the pollution of casing inside by the impurity of outside through light outlet, and air jet pipe can blow the upper surface of dustproof light transmission film, thereby blowing away the dust adhered on dustproof light transmission film.

Description

Technical Field

[0001] This utility model relates to the field of head-up display technology, and in particular to a dustproof structure and a head-up display. Background Technology

[0002] In the field of modern automotive electronics, head-up displays (HUDs) are key devices for enhancing driving safety and convenience, and the cleanliness and sealing of their core optical display units are of paramount importance. In traditional HUD designs, a layer of optical dustproof film is typically applied to the light output port to prevent external dust and impurities from intruding into the internal precision optical components. Currently, sealant is usually used to bond the edges of the dustproof film to the light output port structural frame. However, under the dual conditions of direct sunlight or the heat generated by internal components, the sealant is prone to aging and cracking, causing the dustproof film to detach and allowing dust to enter the HUD and obstruct the light path. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a dustproof structure and a head-up display.

[0004] In a first aspect, this utility model embodiment provides a dustproof structure, the dustproof structure comprising:

[0005] The housing has a light outlet and an annular welding rib on its upper end face, the annular welding rib surrounding the light outlet; the housing also has a positioning strip on its upper end face, the positioning strip being U-shaped with its opening facing forward, the positioning strip surrounding the light outlet;

[0006] A dustproof and light-transmitting film is provided, which can be inserted backward into the positioning strip so that the dustproof and light-transmitting film covers the upper surface of the housing and blocks the light outlet. The dustproof and light-transmitting film is attached to the annular welding rib. The dustproof and light-transmitting film and the annular welding rib are fixed by ultrasonic welding so that the dustproof and light-transmitting film and the housing are relatively fixed. The thickness of the dustproof and light-transmitting film is greater than the thickness of the positioning strip.

[0007] According to some embodiments of the present invention, the dustproof structure further includes an air jet pipe, which is installed on the upper end face of the housing. The air inlet of the air jet pipe is connected to an air source, and the air outlet of the air jet pipe faces the dustproof and light-transmitting membrane.

[0008] According to some embodiments of the present invention, the positioning strip includes a horizontal strip and two vertical strips. The horizontal strip extends in the left-right direction, the vertical strip extends in the front-back direction, and the two vertical strips are spaced apart in the left-right direction. The left and right ends of the horizontal strip are respectively connected to the rear ends of the two vertical strips. The annular welding rib is located between the two vertical strips, and the rear side of the dustproof and light-transmitting membrane abuts against the front side of the horizontal strip.

[0009] According to some embodiments of the present invention, the upper end face of the housing is inclined downward from front to back.

[0010] According to some embodiments of the present invention, the jet pipe is located on the front side of the dustproof and light-transmitting membrane.

[0011] According to some embodiments of the present invention, a drainage groove is provided on the rear side of the housing, the drainage groove extends in the vertical direction, and the upper end of the drainage groove is connected to the upper end face of the housing.

[0012] According to some embodiments of the present invention, the width of the drainage trough gradually decreases from top to bottom.

[0013] According to some embodiments of the present invention, the axial direction of the jet pipe is left-right, the jet pipe is located on the front side of the dustproof and light-transmitting membrane, and a jet branch pipe is provided on the rear side of the jet pipe, with the outlet end of the jet branch pipe facing the dustproof and light-transmitting membrane.

[0014] According to some embodiments of the present invention, there are multiple jet manifolds, and the multiple jet manifolds are arranged at intervals in the left-right direction.

[0015] The dustproof structure according to the embodiment of this utility model has at least the following technical effects:

[0016] 1. A dustproof and light-transmitting membrane covers the upper surface of the housing, thus sealing the light outlet. The lower surface of the membrane is attached to an annular welding rib. The annular welding rib is melted by ultrasonic welding, fixing the membrane to the housing and simultaneously sealing the light outlet. This welding method is highly efficient and provides a strong seal, preventing external impurities from entering through the light outlet and contaminating the interior of the housing.

[0017] 2. The air jet can blow air onto the upper surface of the dustproof and light-transmitting membrane, thereby blowing away the dust adhering to the membrane.

[0018] 3. The positioning strip provides a physical reference for the rapid and accurate pre-positioning of the dustproof film, limiting the degree of freedom of the dustproof and light-transmitting film in the left, right and front directions, ensuring that it accurately covers the light outlet and the ring welding rib before welding, simplifying the assembly process and improving production efficiency.

[0019] Secondly, this utility model embodiment also provides a head-up display, including a dustproof structure according to the first aspect embodiment of this utility model described above.

[0020] The head-up display according to the embodiments of this utility model has at least the following technical effects: The head-up display adopts this dustproof structure, with a dustproof and light-transmitting film covering the upper surface of the housing to block the light outlet, and the lower surface of the dustproof and light-transmitting film adhering to the annular welding rib. The annular welding rib is melted by ultrasonic welding to fix the dustproof and light-transmitting film to the housing, while also sealing the light outlet. This welding method is highly efficient and has strong sealing performance, preventing external impurities from entering through the light outlet and contaminating the inside of the housing; the air jet pipe can blow towards the upper surface of the dustproof and light-transmitting film, thereby blowing away the dust adhering to the dustproof and light-transmitting film.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the dustproof structure of some embodiments of this utility model;

[0024] Figure 2 These are exploded views of the dustproof structure of some embodiments of this utility model;

[0025] Figure 3 This is a top view of a portion of the dustproof structure according to some embodiments of this utility model;

[0026] Figure 4 This is a side view of the dustproof structure of some embodiments of this utility model.

[0027] Icon labels:

[0028] Housing 100; Light outlet 110; Annular welding rib 120; Drainage groove 130;

[0029] Dustproof and light-transmitting membrane 200; positioning strip 210; horizontal strip 220; vertical strip 230;

[0030] Jet nozzle 300; jet manifold 310. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0033] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0034] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0035] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0036] According to some embodiments of this utility model, refer to Figures 1 to 4The dustproof structure includes a housing 100, a dustproof and light-transmitting membrane 200, and an air jet pipe 300. The upper surface of the housing 100 has a light outlet 110 and an annular welding rib 120. The annular welding rib 120 is ring-shaped, protruding upwards from the upper surface of the housing 100 to form the annular welding rib 120, which surrounds the light outlet 110. The annular welding rib 120 provides a precise and continuous fusion area for ultrasonic welding, ensuring the uniformity of subsequent welding and the integrity of the sealing path, and is the basic structure for forming a reliable sealing barrier. The dustproof and light-transmitting membrane 200 covers the upper surface of the housing 100 and blocks the light outlet 110. Light from inside the housing 100 shines outward through the light outlet 110 and the dustproof and light-transmitting membrane. The dustproof and light-transmitting membrane 200 is typically made of a polymer material with high light transmittance, excellent wear resistance, weather resistance, and good weldability, such as polycarbonate, polymethyl methacrylate, or their composite modified materials. These materials effectively transmit light from the HUD image while possessing sufficient mechanical strength to resist minor scratches. The lower end of the dustproof and light-transmitting film 200 is attached to the annular welding rib 120. The dustproof and light-transmitting film 200 and the annular welding rib 120 are fixed together by ultrasonic welding, thus fixing the dustproof and light-transmitting film 200 and the housing 100 relatively. Ultrasonic welding utilizes high-frequency mechanical vibration energy, which is transmitted through the welding head to the contact interface between the annular welding rib 120 and the dustproof film. The intense molecular friction instantly generates local high temperatures, causing the surface materials of the contact surfaces of the annular welding rib 120 and the dustproof and light-transmitting film 200 to melt and penetrate and fuse under pressure. After cooling, the two form a high-strength, gapless, integrated sealed connection at the molecular level. This method is extremely efficient, with a sealing performance far exceeding that of adhesives. It completely solves the risk of seal failure and dustproof film detachment caused by adhesive aging and cracking. It fundamentally blocks the path for external dust and moisture to enter the interior of the housing 100 through the gap in the light outlet 110 and contaminate the precision optical components, greatly improving the long-term environmental sealing reliability of the product.

[0037] Preferably, the jet pipe 300 is mounted on the upper surface of the housing 100, with an air source connected to the air inlet of the jet pipe 300 and the air outlet facing the dustproof and light-transmitting membrane 200. As an active cleaning unit, the jet pipe 300's high-pressure airflow effectively blows away and removes floating dust, fine particles, and some moisture adhering to the surface of the dustproof and light-transmitting membrane 200, significantly reducing light scattering and image blurring caused by surface dust accumulation, and maintaining the clarity of the HUD display. The air source is from the vehicle's air conditioning system or a small dedicated air pump.

[0038] A dustproof and light-transmitting membrane 200 covers the upper surface of the housing 100, thus sealing the light outlet 110. The lower surface of the dustproof and light-transmitting membrane 200 is attached to the annular welding rib 120. Ultrasonic welding melts the annular welding rib 120, fixing the dustproof and light-transmitting membrane 200 to the housing 100 and simultaneously sealing the light outlet 110. This welding method is highly efficient and provides a strong seal, preventing external impurities from entering through the light outlet 110 and contaminating the interior of the housing 100. The fusion area formed by ultrasonic welding is not only a mechanical fixing point but also a continuous, dense, and aging-resistant physical sealing wall. It exhibits excellent resistance to temperature changes and vibrations, and can withstand long-term exposure to direct sunlight and thermal stress caused by internal heating, ensuring the seal remains effective throughout the vehicle's entire lifespan. An air jet pipe 300 blows air towards the upper surface of the dustproof and light-transmitting membrane 200, removing dust adhering to it. This combination of passive sealing and active air blowing constitutes a dual dustproof and cleaning mechanism, jointly ensuring the cleanliness of the optical channel.

[0039] According to some embodiments of this utility model, refer to Figure 2 and Figure 3 The upper surface of the housing 100 is provided with a positioning strip 210. The positioning strip 210 is U-shaped with its opening facing forward and surrounds the light outlet 110. The dustproof and light-transmitting film 200 can be placed on the upper surface of the housing 100 from front to back, so that the front, left, and right sides of the dustproof and light-transmitting film 200 abut against the positioning strip 210. The positioning strip 210 plays a positioning role, facilitating the assembly and positioning of the dustproof and light-transmitting film 200 on the housing 100. The U-shaped positioning strip 210 provides a physical reference for the rapid and accurate pre-positioning of the dustproof film, limiting the film's freedom in the left-right and forward directions, ensuring that it accurately covers the light outlet 110 and the annular welding rib 120 before welding, greatly simplifying the assembly process and improving production efficiency and product consistency. The positioning strip 210 and the housing 100 are integrally molded using the same engineering plastic or alloy, ensuring structural strength and dimensional stability.

[0040] Preferred, refer to Figure 3The positioning strip 210 includes a horizontal strip 220 and two vertical strips 230. The horizontal strip 220 extends in the left-right direction, and the vertical strips 230 extend in the front-back direction. The two vertical strips 230 are spaced apart in the left-right direction. The left and right ends of the horizontal strip 220 are connected to the rear ends of the two vertical strips 230, respectively. The annular welding rib 120 is located between the two vertical strips 230, and the rear side of the dustproof and light-transmitting membrane 200 abuts against the front side of the horizontal strip 220. The two vertical strips 230 work together to restrict the movement of the dustproof and light-transmitting membrane 200 in the left-right direction, and the horizontal strip 220 restricts the rearward movement of the dustproof and light-transmitting membrane 200. The three-point positioning structure designed by the two vertical strips 230 and the horizontal strip 220 ensures accurate positioning while avoiding assembly interference or stress concentration that may be caused by too many constraint points. It is particularly beneficial for the dustproof and light-transmitting membrane 200 to slide smoothly into the positioning from the front of the opening. The rear stop of the horizontal strip 220 effectively prevents the dustproof and light-transmitting membrane 200 from shifting backward during the welding process.

[0041] According to some embodiments of this utility model, the thickness of the dustproof and light-transmitting film 200 is greater than the thickness of the positioning strip 210. This allows the rear side of the dustproof and light-transmitting film 200 to abut against the horizontal strip 220. Because the thickness of the dustproof and light-transmitting film 200 is greater than the positioning strip 210, dust or moisture on the dustproof and light-transmitting film 200 can easily pass over the positioning strip 210, preventing dust and moisture from being blocked by the positioning strip 210 and unable to move backward. The positioning strip 210 serves as a positioning reference, and its thickness only needs to meet the positioning function. The dustproof film is slightly higher, forming a small "step" or "unobstructed channel" at the contact point between the rear edge of the film and the horizontal strip 220. Whether due to natural gravity, vibrations during vehicle movement, or airflow from the jet pipe 300, dust particles and liquid water accumulated on the surface of the film can easily pass over the relatively lower positioning strip 210 and horizontal strip 220 and continue to flow backward without being blocked by the horizontal strip 220 and accumulating. This significantly improves self-cleaning and drainage efficiency, preventing contaminants from accumulating at the positioning strip 210 and forming stubborn stains or watermarks.

[0042] According to some embodiments of this utility model, refer to Figure 3 and Figure 4 The upper surface of the housing 100 slopes downwards from front to back, and the jet pipe 300 is located on the front side of the dustproof and light-transmitting membrane 200. Because the upper surface of the housing 100 slopes downwards from front to back, and the dustproof and light-transmitting membrane 200 also slopes downwards from front to back, dust and moisture on the membrane 200 can naturally flow downwards under gravity, achieving a self-cleaning effect. Furthermore, with the synergistic effect of the jet pipe 300, the surface of the membrane 200 remains dry and clear. The jet pipe 300 blows air from the front, and its force direction is consistent with the backward flow direction driven by gravity. The airflow not only directly blows away some dust but also pushes and accelerates the contaminants already on the membrane 200 to slide backwards and downwards along the slope, significantly enhancing the cleaning power and speed.

[0043] According to some embodiments of this utility model, refer to Figure 1 and Figure 2 The rear side of the housing 100 is provided with a drainage groove 130, which extends vertically and whose upper end is connected to the upper end face of the housing 100. The width of the drainage groove 130 gradually decreases from top to bottom. Water on the dustproof and light-transmitting membrane 200 can flow backward and enter the drainage groove 130 for drainage. Because the width of the drainage groove 130 gradually decreases from top to bottom, it can guide the water to gradually gather and drain to the designated location.

[0044] Understandably, when water on the dustproof and light-transmitting membrane 200 flows backward, because the upper end of the drain channel 130 is connected to the upper surface of the housing 100, some water will flow backward into the drain channel 130 first, rather than flowing backward to the rear boundary of the housing 100, and the remaining water will gradually fill the gap. The drain channel 130, as the terminal collection and discharge channel of the self-cleaning system, has its top opening seamlessly connected to the inclined upper surface of the housing 100, effectively capturing the liquid water flowing down from the rear of the membrane, preventing disorderly water flow from contaminating surrounding components or entering other gaps. The wider upper end of the drain channel 130 facilitates the collection of water flowing down from a larger area, while the channel width gradually narrows downward, guiding the water flow to naturally converge towards the center line of the channel during downward flow, increasing the water flow velocity and scouring force, effectively reducing water adhesion and residue on the channel wall, and preventing scale formation due to water dispersion and reduced flow velocity caused by excessively wide channel walls. Ultimately, the water is efficiently guided to the designated outlet at the bottom of the tank, completing a rapid and thorough drainage process.

[0045] According to some embodiments of this utility model, refer to Figure 3 and Figure 4 The jet pipe 300 has its axis pointing left and right. It is located in front of the dustproof and light-transmitting membrane 200. A jet branch pipe 310 is located behind the jet pipe 300, with its outlet facing the dustproof and light-transmitting membrane 200. Multiple jet branch pipes 310 are arranged at intervals along the left and right direction. These multiple jet branch pipes work together to blow clean the entire surface of the dustproof and light-transmitting membrane 200, ensuring that the surface is dry, clear, and free of impurities.

[0046] In this specification, the reference to the term "some embodiments" means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A dustproof structure, characterized in that, include: A housing (100) has a light outlet (110) and an annular welding rib (120) on its upper end face, the annular welding rib (120) surrounding the light outlet (110); a positioning strip (210) is provided on the upper end face of the housing (100), the positioning strip (210) is U-shaped and its opening faces forward, the positioning strip (210) surrounding the light outlet (110); A dustproof and light-transmitting film (200) is provided, which can be inserted backward into the positioning strip (210) so that the dustproof and light-transmitting film (200) covers the upper surface of the housing (100) and blocks the light outlet (110). The dustproof and light-transmitting film (200) is attached to the annular welding rib (120). The dustproof and light-transmitting film (200) and the annular welding rib (120) are fixed by ultrasonic welding so that the dustproof and light-transmitting film (200) and the housing (100) are relatively fixed. The thickness of the dustproof and light-transmitting film (200) is greater than the thickness of the positioning strip (210).

2. The dustproof structure according to claim 1, characterized in that, The dustproof structure also includes a jet pipe (300), which is installed on the upper end face of the housing (100). The air inlet of the jet pipe (300) is connected to an air source, and the air outlet of the jet pipe (300) faces the dustproof and light-transmitting membrane (200).

3. The dustproof structure according to claim 1, characterized in that, The positioning strip (210) includes a horizontal strip (220) and two vertical strips (230). The horizontal strip (220) extends in the left-right direction, and the vertical strips (230) extend in the front-back direction. The two vertical strips (230) are spaced apart in the left-right direction. The left and right ends of the horizontal strip (220) are respectively connected to the rear ends of the two vertical strips (230). The annular welding rib (120) is located between the two vertical strips (230). The rear side of the dustproof and light-transmitting membrane (200) abuts against the front side of the horizontal strip (220).

4. The dustproof structure according to claim 2, characterized in that, The upper surface of the housing (100) slopes downward from front to back.

5. The dustproof structure according to claim 4, characterized in that, The jet pipe (300) is located on the front side of the dustproof and light-transmitting membrane (200).

6. The dustproof structure according to claim 4, characterized in that, The rear side of the housing (100) is provided with a drainage groove (130), which extends in the vertical direction and the upper end of the drainage groove (130) is connected to the upper end face of the housing (100).

7. The dustproof structure according to claim 6, characterized in that, The width of the drainage trough (130) gradually decreases from top to bottom.

8. The dustproof structure according to claim 2, characterized in that, The axial direction of the jet pipe (300) is left and right. The jet pipe (300) is located in front of the dustproof and light-transmitting membrane (200). A jet branch pipe (310) is provided on the rear side of the jet pipe (300). The air outlet end of the jet branch pipe (310) faces the dustproof and light-transmitting membrane (200).

9. The dustproof structure according to claim 8, characterized in that, The jet manifold (310) is multiple, and the multiple jet manifolds (310) are arranged at intervals in the left-right direction.

10. A heads-up display, characterized in that, It includes the dustproof structure as described in any one of claims 1 to 9.

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