Head-up display limiting device and head-up display

Abstract

The utility model relates to a kind of head-up display limiting device and head-up display, wherein head-up display includes shell, still include secondary reflector, mainboard PCB and limit switch, secondary reflector is deflectable installed on the shell, mainboard PCB, it is installed on the shell and located the below of secondary reflector, limit switch is attached on the mainboard PCB, the trigger portion of the limit switch is located the deflection path of secondary reflector, to be triggered when secondary reflector deflects to limit position.The utility model has the beneficial effects in that it can simplify system structure, reduce production cost, improve production efficiency and improve product reliability.

Description

Technical Field

[0001] This utility model relates to the field of HUD technology, specifically to a head-up display limiting device and a head-up display. Background Technology

[0002] With the continuous improvement of automotive intelligence, head-up displays (HUDs) have become a standard feature in many models, especially new energy vehicles, due to their ability to significantly enhance driving safety and experience. HUDs project driving information onto the windshield in front of the driver, avoiding the safety hazards caused by the driver looking down at the instrument panel.

[0003] In the optical system of a HUD, the secondary reflector typically needs to deflect within a certain angle range to adjust the image position. To ensure reliable operation of the reflector within its mechanical movement range and prevent damage to its internal structure due to excessive deflection, a limiting device must be installed. In existing technologies, typical HUD limiting devices usually use an independent microswitch (such as a direct-acting or rocker type) as the core sensing element. This switch is mounted on a separately designed, small switch PCB board and connected to the system's mainboard PCB via wiring harnesses and connectors, thus forming a complete limit signal detection and transmission loop.

[0004] However, the use of separate switch PCBs, dedicated connectors, and wiring harnesses directly increases the bill of materials cost. The additional components also bring greater procurement, warehousing, and assembly management expenses. On the production line, the assembly of the switch PCBs, the wiring and termination of the wiring harnesses, and the final connection to the mainboard PCB need to be completed separately. These additional assembly steps reduce production efficiency and increase labor and time costs. The wiring harness connecting the switch and the mainboard acts like an antenna in the high-frequency digital circuit environment inside the HUD, easily becoming a source or receiver of electromagnetic interference (EMI), thus increasing the difficulty and uncertainty of the entire HUD system passing EMC testing and affecting product reliability. Furthermore, the separate switch components require additional installation space, making the already compact internal structure layout of the HUD even more difficult and limiting the miniaturization design of the product. Utility Model Content

[0005] The purpose of this utility model is to provide a head-up display limiting device and a head-up display that can simplify the system structure, reduce production costs, improve production efficiency, and enhance product reliability.

[0006] A head-up display limiting device includes a housing and further includes: A secondary reflector, which is rotatably mounted on the housing; The motherboard PCB is mounted on the housing and located below the secondary reflector; A limit switch is mounted on the motherboard PCB. The trigger part of the limit switch is located on the deflection path of the secondary reflector so as to be triggered when the secondary reflector deflects to the limit position.

[0007] In the above solution, the mainboard PCB is mounted below the secondary reflector, and the limit switch is mounted on the mainboard PCB. When the secondary reflector deflects to the trigger point of the limit switch and is activated, it indicates that the secondary reflector has reached its preset limit position. Mounting the limit switch on the mainboard PCB directly reduces the need for a separate switch PCB, dedicated connectors, and wiring harnesses, lowering material costs and the number of components, thereby reducing indirect costs such as supply chain management and warehousing logistics. Treating the limit switch as a standard electronic component and mounting it along with other components on the mainboard PCB using surface mount technology eliminates the need for subsequent installation of a switch sub-board. Separate processes such as welding wire harnesses simplify the final assembly process, reduce assembly steps and time, thereby significantly improving production efficiency, product consistency, and yield. The elimination of the long wire harness connecting the switch and the motherboard fundamentally removes a potential electromagnetic interference radiating and receiving antenna, significantly reducing the risk of head-up displays failing EMC tests due to interference with the limit switch circuit, thus improving product reliability and test pass rate. Furthermore, the saved installation space for the independent switch assembly allows for a more compact internal layout design for the head-up display, facilitating product miniaturization and weight reduction.

[0008] Furthermore, both sides of the housing are provided with a first support structure, and a deflectable reflector bracket is attached to the two first support structures. The secondary reflector is mounted on the reflector bracket.

[0009] In the above scheme, the secondary reflector is mounted on the reflector bracket. The deflection of the reflector bracket drives the deflection of the secondary reflector, which ensures the stability of the deflection of the secondary reflector and thus ensures the clarity and stability of the image. The reflector bracket is attached to the first support mechanism on both sides of the shell. This design can evenly distribute the weight of the reflector bracket and the secondary reflector itself, as well as the inertial force during the movement, onto the shell, avoiding stress concentration.

[0010] Furthermore, one end of the reflector bracket is provided with a toggle lever, which includes a main body and a toggle part extending from the main body. A groove is formed between the toggle part and the main body. The toggle lever is used to trigger or disengage the limit switch.

[0011] In the above scheme, when the secondary reflector is working normally, the toggle lever is disengaged from the limit switch. When the reflector bracket deflects to the extreme position, the toggle lever contacts the limit switch, thereby triggering the limit switch. This design directly reduces the need for independent switch PCBs, dedicated connectors, and wiring harnesses, thereby reducing material costs, reducing the number of parts, and consequently reducing indirect costs such as supply chain management and warehousing logistics.

[0012] Furthermore, it also includes a drive assembly, which includes a drive component, a base, and a worm gear. The base is installed inside the housing, the drive component is installed at one end of the base, and the drive end of the drive component passes through the base and is connected to the worm gear. The reflector bracket is connected to a sector-shaped worm wheel, and the worm wheel meshes with the worm gear.

[0013] In the above scheme, the drive component is used to drive the reflector bracket to deflect. The base is installed in the housing to ensure the stable operation of the drive component. The drive component drives the worm to rotate, which in turn drives the sector worm wheel that meshes with the worm to rotate, causing the reflector bracket to deflect. The worm wheel and worm gear transmission has a high reduction ratio, which can convert the high-speed rotation of the drive component into the low-speed and smooth deflection motion of the reflector bracket. When the reflector bracket drives the secondary reflector to deflect to the limit position, the limit switch is triggered. The inherent characteristics of the worm wheel and worm gear mechanism provide a strong reverse self-locking capability. When the drive component stops driving, it can ensure that the reflector bracket is reliably locked in the current position.

[0014] Furthermore, the reflector bracket has connecting posts at both ends, and the first support structure has a semi-circular groove, in which the connecting posts are embedded and can rotate.

[0015] In the above scheme, the connecting post is embedded in the semi-circular groove and can rotate along the groove, which can ensure the stable deflection of the reflector bracket. Moreover, the semi-circular groove can play a certain role in restraining the connecting post, effectively preventing unnecessary radial or axial movement of the reflector bracket during movement, ensuring the smoothness and repeatability of the deflection movement, and providing a basic guarantee for the stability of the head-up display optical system and the accuracy of the limit switch triggering.

[0016] Furthermore, the housing is provided with a second support structure, which has a plurality of support columns, and the motherboard PCB is connected to the support columns by fasteners.

[0017] In the above scheme, the second support structure provides a foundation for the installation of the motherboard PCB, so that the motherboard PCB is located below the secondary reflector. The support columns on the second support structure provide discrete, high-rigidity support points for the motherboard PCB. The motherboard PCB and the support columns are firmly connected together by screws and other fasteners. The stable connection method avoids the inaccuracy of the trigger part of the limit switch caused by the displacement of the motherboard PCB, thereby ensuring the accuracy and consistency of the limit switch's limiting function for the secondary reflector.

[0018] Furthermore, the limit switch is located near the side of the motherboard PCB, and the trigger portion extends out from the side of the motherboard PCB.

[0019] In the above scheme, the trigger part of the limit switch extends out of the side of the motherboard PCB. This ensures that the trigger part is accurately located on the movement path of the toggle lever of the reflector bracket, and avoids trigger failure caused by the motherboard PCB itself or other tall peripheral components blocking the toggle lever, thus ensuring the reliability of the limit function.

[0020] Furthermore, the limit switch is a rocker-type micro switch.

[0021] In the above scheme, the lever transmission and high tolerance of the rocker-type micro switch can ensure the stability of the trigger limit function of the toggle lever.

[0022] Furthermore, the limit switch includes a switch body and a lever arm, the lever arm is connected to the switch body, and the trigger part is located at the free end of the lever arm.

[0023] In the above scheme, the lever arm can convert a mechanical action with a large displacement and a small force applied to its free end into a precise triggering action with a small displacement and a large force applied to the internal mechanism of the switch body. In this way, the actuating rod of the reflector bracket does not need to move a long distance or apply a large force to reliably trigger the limit switch, thereby ensuring the reliability of the limit switch for the limiting function of the secondary reflector.

[0024] A head-up display, including a head-up display limiting device as described in any of the above embodiments.

[0025] This utility model discloses a head-up display (HUD) limiting device and HUD, which has the beneficial effects of simplifying system structure, reducing production costs, improving production efficiency, and enhancing product reliability. The mainboard PCB is mounted below the secondary reflector, and the limit switch is mounted on the mainboard PCB. When the secondary reflector deflects to the trigger point of the limit switch and is activated, it indicates that the secondary reflector has reached the preset limit position. Mounting the limit switch on the mainboard PCB directly reduces the need for a separate switch PCB, dedicated connectors, and wiring harnesses, lowering material costs and the number of components, thereby reducing indirect costs such as supply chain management and warehousing logistics. By using the limit switch as a standard electronic component and mounting it together with other components on the mainboard PCB using surface mount technology, the subsequent installation of a switch sub-board and soldering of wiring harnesses is eliminated. By eliminating separate processes, the overall assembly process is simplified, reducing assembly steps and time, thereby significantly improving production efficiency, product consistency, and yield. The elimination of the long wiring harness connecting the switch and the motherboard fundamentally removes a potential electromagnetic interference radiating and receiving antenna, significantly reducing the risk of head-up displays failing EMC tests due to interference with the limit switch circuit, thus improving product reliability and test pass rate. Furthermore, the saved installation space for the independent switch assembly allows for a more compact internal layout design for the head-up display, facilitating product miniaturization and weight reduction. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a head-up display limiting device according to an embodiment.

[0027] Figure 2 This is a schematic diagram of a reflector bracket, a drive assembly, and a motherboard PCB according to one embodiment.

[0028] Figure 3 This is a schematic diagram of the shell structure of one embodiment.

[0029] Figure 4 This is a schematic diagram of a toggle lever according to one embodiment.

[0030] Figure 5 for Figure 4 A magnified view of a portion of the image.

[0031] Figure 6 This is a schematic diagram showing the position of a limit switch on a motherboard PCB according to one embodiment.

[0032] Explanation of reference numerals: 1. Housing; 2. Secondary reflector; 3. Main board PCB; 4. Limit switch; 41. Switch body; 42. Lever arm; 5. First support structure; 51. Groove; 6. Reflector bracket; 61. Actuating lever; 611. Main body; 612. Actuating part; 613. Slot; 62. Connecting column; 7. Drive assembly; 71. Drive component; 72. Base; 73. Worm gear; 74. Sector worm wheel; 8. Second support mechanism; 9. Support column. Detailed Implementation

[0033] The following will describe in further detail a head-up display limiting device and a head-up display according to specific embodiments and accompanying drawings.

[0034] like Figure 1 and Figure 2 As shown in a preferred embodiment, the head-up display (HUD) limiting device of this invention includes a housing 1, a secondary reflector 2, a mainboard PCB 3, and a limit switch 4. The secondary reflector 2 is rotatably mounted on the housing 1. The mainboard PCB 3 is mounted on the housing 1 and located below the secondary reflector 2. The limit switch 4 is attached to the mainboard PCB 3, and its triggering part is located on the deflection path of the secondary reflector 2 so as to be triggered when the secondary reflector 2 deflects to its limit position. Since the mainboard PCB 3 is mounted below the secondary reflector 2 and the limit switch 4 is attached to the mainboard PCB 3, when the secondary reflector 2 deflects to the point where the triggering part of the limit switch 4 is triggered, it indicates that the secondary reflector 2 has reached a preset limit position, which is the HUD's power-off position.

[0035] Limit switch 4 is mounted on the mainboard PCB3, directly reducing the need for a separate switch PCB, dedicated connectors, and wiring harnesses, thus lowering material costs and the number of components. This, in turn, reduces indirect costs such as supply chain management and warehousing logistics. By treating limit switch 4 as a standard electronic component and mounting it alongside other components on the mainboard PCB3 using surface mount technology, separate steps such as installing switch sub-boards and soldering wiring harnesses are eliminated, simplifying the overall assembly process, reducing assembly steps and time, and significantly improving production efficiency, product consistency, and yield. The elimination of the long wiring harness connecting the switch and the mainboard fundamentally removes a potential electromagnetic interference radiating and receiving antenna, significantly reducing the risk of head-up displays failing EMC tests due to interference with or generated by the limit switch 4 circuit, improving product reliability and test pass rate. Furthermore, the saved installation space for the independent switch assembly allows for a more compact internal layout design for the head-up display, facilitating product miniaturization and weight reduction.

[0036] like Figures 1 to 3As shown, in some embodiments, both side walls of the housing 1 are provided with first support structures 5, and two deflectable mirror brackets 6 are attached to the two first support structures 5. The secondary mirror 2 is mounted on the mirror bracket 6. The secondary mirror 2 is mounted on the mirror bracket 6, and the deflection of the mirror bracket 6 drives the secondary mirror 2 to deflect. This ensures the stability of the deflection of the secondary mirror 2, thereby ensuring the clarity and stability of the image. The mirror bracket 6 is attached to the first support structures on both side walls of the housing 1. This design can evenly distribute the weight of the mirror bracket 6 and the secondary mirror 2, as well as the inertial force during the movement, onto the housing 1, avoiding stress concentration.

[0037] like Figure 4 and Figure 5 As shown, in some embodiments, one end of the reflector bracket 6 is provided with a toggle lever 61. The toggle lever 61 includes a main body 611 and a toggle part 612 extending out of the main body 611. A slot 613 is formed between the toggle part 612 and the main body 611. The toggle lever 61 is used to trigger or disengage the limit switch 4. When the secondary reflector 2 is working normally, the toggle lever 61 is disengaged from the limit switch 4. When the reflector bracket 6 deflects to the limit position, the toggle lever 61 contacts the limit switch 4, thereby triggering the limit switch 4. The main body 611 can ensure the stability of the toggle part 612. The toggle part 612 extends out of the main body 611, so that there is a certain gap between the toggle part 612 and the limit switch 4. The toggle part is toggled by the slot 613 formed between the toggle part 612 and the main body 611, which can ensure the stability of the toggle during toggle, thereby ensuring the stability of the limit function triggering. This design directly reduces the independent switch PCB board, dedicated connectors and wiring harnesses, reduces material costs, reduces the number of parts, and thus reduces indirect costs such as supply chain management and warehousing logistics.

[0038] like Figure 2 and Figure 4As shown, in some embodiments, a drive assembly 7 is also included. The drive assembly 7 includes a drive member 71, a base 72 and a worm gear 73. The base 72 is installed inside the housing 1. The drive member 71 is installed at one end of the base 72. The drive end of the drive member 71 passes through the base 72 and is connected to the worm gear 73. The reflector bracket 6 is connected to a sector worm wheel 74, which meshes with the worm gear 73. The drive assembly 7 is used to drive the reflector bracket 6 to deflect. The base 72 is installed in the housing 1 to ensure the stable operation of the drive assembly 7. The drive component 71 drives the worm gear 73 to rotate, which in turn drives the sector worm wheel 74, which is meshed with the worm gear 73, to rotate, causing the reflector bracket 6 to deflect. The sector worm wheel 74 and the worm gear 73 transmission have a high reduction ratio, which can convert the high-speed rotation of the drive component 71 into a low-speed, smooth deflection motion of the reflector bracket 6. When the reflector bracket 6 drives the secondary reflector 2 to deflect to the limit position, the limit switch 4 is triggered. The inherent characteristics of the worm wheel 74 and the worm gear 73 mechanism provide a strong reverse self-locking capability. When the drive component 71 stops driving, it can ensure that the reflector bracket 6 is reliably locked in the current position.

[0039] like Figure 2 and Figure 3 As shown, in some embodiments, the reflector bracket 6 has connecting posts 62 at both ends, and the first support structure 5 has a semi-circular groove 51. The connecting posts 62 are embedded in the grooves 51 and can rotate along them. The fact that the connecting posts 62 are embedded in the semi-circular grooves 51 and can rotate along them ensures stable deflection of the reflector bracket 6. Moreover, the semi-circular grooves 51 can provide a certain degree of constraint on the connecting posts 62, effectively preventing unnecessary radial or axial movement of the reflector bracket 6 during movement. This ensures the smoothness and repeatability of the deflection movement, providing a fundamental guarantee for the stability of the head-up display optical system and the accuracy of the limit switch 4 triggering.

[0040] like Figure 3 As shown, in some embodiments, a second support structure 8 is provided inside the housing 1, and a plurality of support columns 9 are provided on the second support structure 8. The mainboard PCB 3 is connected to the support columns 9 by fasteners. The second support structure 8 provides a foundation for the installation of the mainboard PCB 3, so that the mainboard PCB 3 is located below the secondary reflector 2. The support columns 9 on the second support structure 8 provide discrete, high-rigidity support points for the mainboard PCB 3. The mainboard PCB 3 and the support columns 9 are firmly connected together by fasteners such as screws. The stable connection method avoids the misalignment of the trigger part of the limit switch 4 caused by the displacement of the mainboard PCB 3, thereby ensuring the accuracy and consistency of the limit switch 4's limiting function for the secondary reflector 2.

[0041] like Figure 6As shown, in some embodiments, the limit switch 4 is positioned close to the side of the motherboard PCB 3, and the trigger portion extends beyond the side of the motherboard PCB 3. The extension of the trigger portion of the limit switch 4 to the side of the motherboard PCB 3 ensures that the trigger portion is precisely positioned on the movement path of the toggle lever 61 of the reflector bracket 6, and avoids trigger failure caused by the motherboard PCB 3 itself or other taller peripheral components obstructing the toggle lever 61, thus ensuring the reliability of the limit function.

[0042] In some embodiments, the limit switch 4 is a rocker-type micro switch. The lever drive and high tolerance of the rocker-type micro switch can ensure the stability of the limit function triggered by the lever 61.

[0043] like Figure 6 As shown, in some embodiments, the limit switch 4 includes a switch body 41 and a lever arm 42. The lever arm 42 is connected to the switch body 41, and the triggering part is located at the free end of the lever arm 42. The lever arm 42 can convert a mechanical action of a large displacement and a small force applied to its free end into a precise triggering action of a small displacement and a large force acting on the internal mechanism of the switch body 41. In this way, the actuating rod 61 of the reflector bracket 6 does not need to move a long distance precisely or apply a large force to reliably trigger the limit switch 4, thereby ensuring the reliability of the limit switch 4 in limiting the secondary reflector 2. The limit switch 4 is an existing standard part, and its structure is not shown in detail in the attached drawings.

[0044] A head-up display, including a head-up display limiting device as described in any of the above embodiments.

[0045] This utility model discloses a head-up display (HUD) limiting device and the working principle and process of the HUD. When the HUD is working normally, the secondary reflector 2 reflects image information onto the windshield for the driver to view. At this time, the toggle lever 61 on the reflector bracket 6 remains separated from the trigger part of the limit switch 4, and the limit switch 4 is in its untriggered original state, continuously feeding back a "not in position" signal to the control unit on the main board PCB 3, indicating that the HUD is in normal display state. When the driver turns off the HUD, the control unit on the main board PCB 3 sends a command to the drive assembly 7, the drive motor starts, and drives the sector worm wheel 74 fixed on the reflector bracket 6 through the worm gear 73, starting to drive the secondary reflector 2 and the reflector bracket 6 to deflect to the preset limit position, which is the power-off position. When the toggle lever 61 contacts the trigger part of the limit switch 4 and applies a force to the trigger part, the limit switch 4 transmits the triggered "in position" signal to the control unit. After the control unit confirms that the secondary reflector 2 has reached the power-off position, it cuts off the power to turn off the HUD.

[0046] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation 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.

[0047] 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 utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A head-up display limiting device, comprising a housing, characterized in that, Also includes: A secondary reflector, which is rotatably mounted on the housing; The motherboard PCB is mounted on the housing and located below the secondary reflector; A limit switch is mounted on the motherboard PCB. The trigger part of the limit switch is located on the deflection path of the secondary reflector so as to be triggered when the secondary reflector deflects to the limit position.

2. The head-up display limiting device according to claim 1, characterized in that, Both sides of the housing are provided with a first support structure, and a deflectable reflector bracket is attached to the two first support structures. The secondary reflector is mounted on the reflector bracket.

3. The head-up display limiting device according to claim 2, characterized in that, One end of the reflector bracket is provided with a toggle lever, which includes a main body and a toggle part extending from the main body. A groove is formed between the toggle part and the main body. The toggle lever is used to trigger or disengage the limit switch.

4. The head-up display limiting device according to claim 2, characterized in that, It also includes a drive assembly, which includes a drive component, a base, and a worm gear. The base is installed inside the housing, the drive component is installed at one end of the base, and the drive end of the drive component passes through the base and is connected to the worm gear. The reflector bracket is connected to a sector worm wheel, and the worm wheel meshes with the worm gear.

5. The head-up display limiting device according to claim 2, characterized in that, The reflector bracket has connecting posts at both ends, and the first support structure has a semi-circular groove. The connecting posts are embedded in the groove and can rotate along it.

6. The head-up display limiting device according to claim 1, characterized in that, The housing contains a second support structure, which has a plurality of support columns. The motherboard PCB is connected to the support columns by fasteners.

7. The head-up display limiting device according to claim 1, characterized in that, The limit switch is located near the side of the motherboard PCB, and the trigger part extends out of the side of the motherboard PCB.

8. The head-up display limiting device according to claim 1, characterized in that, The limit switch is a rocker-type micro switch.

9. The head-up display limiting device according to claim 1, characterized in that, The limit switch includes a switch body and a lever arm, the lever arm is connected to the switch body, and the trigger part is located at the free end of the lever arm.

10. A heads-up display, characterized in that, Includes the head-up display limiting device as described in any one of claims 1 to 9 above.

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