Projection device, projection system and vehicle lamp system
By adopting the design of an inclined optical axis and an aspherical reflection cup in the projection device, the problem of the projection device being unable to take into account the small display range and unclear remote picture is solved, and the target pattern projected on the ground is displayed uniformly and clearly.
Patent Information
- Application Number
- CN202421110470.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-21
AI Technical Summary
The existing projection device cannot take into account the problem of small display range on the ground and unclear picture at the far end.
A projection device including a projection lens module and a reflection cup is used. By tilting the optical axis of the projection lens module relative to the display surface and setting an aspherical reflection cup on the light exit side, the opening direction of the reflection cup is tilted relative to the display surface. To adjust the position of the projected display surface, bring it closer to the ground until it overlaps.
It achieves uniform and clear display of the projected target pattern on the display surface, and at the same time expands the range of the display surface, solving the problem of balancing large projection range and clarity.
Smart Images
Figure CN222365183U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of projection lighting technology, and in particular to a projection device, a projection system and a vehicle lighting system. Background Art
[0002] In recent years, projection systems have been added to the field of automotive lighting, allowing the lighting system to project a variety of light and shadow target patterns, forming a lot of "car language" composed of these target patterns.
[0003] The projection device in the headlight system in the related art is an automotive projection device evolved from a transmissive front-projection imaging system. The projection lens module includes a display device and a lens group, and the display device can provide a target pattern. The projection light beam after the projection lens module directly projects the target pattern of the display device onto the ground. If the lens group adopts a long-focus imaging lens group, the range of the projection light beam irradiated to the ground is small, that is, the range of the display surface is small; if the lens group adopts a short-focus imaging lens group, the aperture of the lens group will be large, and the picture cannot be displayed clearly at a farther projection distance. Utility Model Content
[0004] The embodiments of the present application provide a projection device, a projection system and a vehicle light system, which are used to solve the problem that the projection device in the related art cannot take into account both the small display range on the ground and the unclear image at a long projection distance.
[0005] In the first aspect, an embodiment of the present application provides a projection device, comprising a projection lens module and a reflective cup; the projection lens module has a target pattern; the optical axis of the projection lens module is tilted relative to the display surface of the projection device, and the projection lens module has a light emitting side, and the light emitting side is away from the display surface; the reflective cup is arranged on the light emitting side, the opening of the reflective cup faces the display surface, and the opening direction of the reflective cup is tilted relative to the display surface; wherein the inner side surface of the reflective cup is a reflective surface, and the reflective surface is an aspherical surface; the reflective surface is used to reflect the projection light beam irradiated from the projection lens module through the opening to the reflective surface to the display surface, so as to project the target pattern on the display surface.
[0006] In some embodiments, the display surface is the ground.
[0007] In some embodiments, the optical axis of the projection light beam is perpendicular to the display surface.
[0008] In some embodiments, the opening direction of the reflective cup can be rotated relative to the display surface.
[0009] In some embodiments, the angle between the opening direction of the reflector cup and the display surface is determined based on the projection ratio of the projection lens module and the distance between the reflector cup and the display surface, wherein the projection ratio is the ratio of the distance between the reflector cup and the display surface along the optical axis to the width of the picture projected onto the display surface.
[0010] In some embodiments, the projection lens module includes a display device and a lens group, the display device can provide the target pattern, the lens group is located between the display device and the reflective cup, and the lens group is used to change the optical parameters of the projection device.
[0011] In some embodiments, the display device is any one of LCD, LCOS, and DLP.
[0012] In some embodiments, the display device includes an optical element having the target pattern.
[0013] In some embodiments, the lens group includes at least one or more of a spherical lens, an aspherical lens, a filter, and a prism.
[0014] Compared with the projection light beam emitted from the projection lens module directly projected onto the display surface, the projection device provided by the embodiment of the present application firstly tilts the optical axis of the projection lens module relative to the display surface of the projection device, and makes the light-emitting side of the projection lens module away from the display surface; a reflector cup is arranged on the light-emitting side of the projection lens module, and the reflective surface of the reflector cup is an aspherical surface, and by adjusting the optical axis of the projection lens module and the opening direction of the reflector cup, the opening direction of the reflector cup is tilted relative to the display surface of the projection device, so that the user can adjust the position of the display surface of the projection of the projection device, so that the position of the display surface is close to the ground until it overlaps. In this way, when the projection light emitted from the light-emitting side of the projection lens module passes through the opening and irradiates the reflective surface, the projection light is reflected by the reflective surface and then reflected from the opening to the display surface, so that the target pattern is projected on the display surface, so that the projection light beam reflected by the reflective surface will be more evenly irradiated on the display surface, which not only expands the range of the display surface, but also enables the target pattern on the display surface to be displayed evenly and clearly, so that the projection device can achieve the purpose of taking into account both the large projection display and the uniform and clear display of the projected target pattern on the display surface.
[0015] In a second aspect, an embodiment of the present application further provides a projection system, comprising the projection device and a light source as described in the first aspect, wherein the light source provides the projection light beam for the projection device.
[0016] The projection system in the embodiment of the present application has the same technical effect as that achieved by the projection device in the first aspect, which will not be described in detail here.
[0017] In a third aspect, an embodiment of the present application further provides a vehicle lighting system, comprising the projection device described in the first aspect.
[0018] The vehicle lighting system in the embodiment of the present application has the same technical effect as that achieved by the projection device in the first aspect, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 A light path diagram of a vehicle lighting system in the related art;
[0021] Figure 2 Light path diagram of a projection or vehicle lighting system in some embodiments of the present application;
[0022] Figure 3 Schematic diagram of the structure of the projection device in some embodiments of the present application.
[0023] Description of reference numerals:
[0024] 100, light source; 200, display surface;
[0025] 10. projection lens module; 101. optical axis; 11. display device; 12. lens group;
[0026] 20. Reflection cup; 201. Opening; 21. Reflection surface. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0028] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0029] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0031] In recent years, projection systems have been added to the field of automotive lighting, allowing the lighting system to project a variety of light and shadow target patterns, forming a lot of "car language" composed of these target patterns.
[0032] The projection device in the vehicle lighting system in the related art adopts the vehicle projection device evolved from the transmissive front projection imaging system. Figure 1 As shown, the projection lens module 10 includes a display device 11 and a lens group 12. The display device 11 can provide a target pattern. The optical axis 101 of the projection lens module 10 is tilted relative to the ground, and the light-emitting side of the projection lens module 10 is tilted downward, so that the projection light beam after the projection lens module 10 directly projects the target pattern of the display device 11 onto the ground surface. Under normal circumstances, the projection device can clearly project an ideal display surface 200 ( Figure 1 The dotted line in FIG. 1 is indicative of the optical axis 101 ( Figure 1However, since the optical axis 101 of the projection lens module 10 in the related art is tilted relative to the ground, the angle between the ground and the ideal display surface 200 is too large, resulting in the phenomenon that the target pattern projected on the ground is clear at the near end and blurred at the far end. At the same time, if the lens group 12 adopts a telephoto imaging lens group, the range of the projection light beam irradiated to the ground is small, that is, the range of the display surface 200 is small; if the lens group 12 adopts a short-focus imaging lens group, the aperture of the lens group will be large, and the picture cannot be clearly displayed at the far end of the projection distance. The optical path diagram of the headlight system in the related art is shown in FIG. Figure 1 shown.
[0033] In order to solve the above problem, in the vehicle lamp system, the angle between the display surface 200 and the ground is reduced, and the angle between the display surface 200 projected by the projection device and the ground is made as small as possible, until the display surface 200 coincides with the ground. The present application provides a projection device, a projection system and a vehicle lamp system. Figure 2 As shown, the projection device includes a projection lens module 10 and a reflective cup 20. The reflective cup 20 is arranged on the light-emitting side of the projection lens module 10. Figure 2 First, the optical axis 101 of the projection lens module 10 is tilted relative to the display surface 200 of the projection device, and the light-emitting side of the projection lens module 10 is away from the display surface 200; then, by adjusting the optical axis 101 of the projection lens module 10 and the opening direction of the reflection cup 20 ( Figure 2 The opening direction X of the reflective cup 20 is tilted relative to the display surface 200 of the projection device. In this way, the user can adjust the position of the display surface 200 of the projection device so that the position of the display surface 200 is tilted toward the direction indicated by the arrow X. Figure 2 The dotted lines at the lower left corner are brought closer until they overlap. In this way, the projection device can achieve the purpose of clear and uniform display over a large area on the ground.
[0034] like Figure 2 and Figure 3 As shown, the projection system includes a projection device and a light source 100, and the light source 100 provides a projection beam for the projection device.
[0035] It should be noted that the light source 100 may be a separate device for providing a projection light beam for the projection device, or the light source 100 may be integrated into the projection device to form a projection system.
[0036] When the projection device is used in a car, the projection system can also be called a car lighting system. Some devices of the car lighting system are as follows: Figure 3 However, the projection system can be, but is not limited to, a vehicle lighting system.
[0037] Of course, in addition to this, the projection device can also be used independently as a projection device and equipment, which is not specifically limited here. The following takes the application of the projection device in a car as an example for explanation.
[0038] like Figure 2 As shown, the projection device includes a projection lens module 10 and a reflective cup 20; the projection lens module 10 has a target pattern; the optical axis 101 of the projection lens module 10 is relative to the display surface 200 ( Figure 2 The projection lens module 10 has a light emitting side, which faces away from the display surface 200; the reflective cup 20 is arranged on the light emitting side, the opening 201 of the reflective cup 20 faces the display surface 200, and the opening direction X of the reflective cup 20 is inclined relative to the display surface 200; wherein, the inner side surface of the reflective cup 20 is a reflective surface, and the reflective surface is an aspherical surface; the reflective surface is used to reflect the projection light beam irradiated from the projection lens module 10 through the opening 201 to the reflective surface to the display surface 200, so as to project the target pattern on the display surface 200.
[0039] The projection lens module 10 generally has a light-incoming side and a light-outgoing side, and the light source is generally disposed on the light-incoming side so that the light beam emitted by the light source is irradiated into the projection lens module 10, and the light beam emitted by the light source forms a specific projection light beam having a target pattern after passing through the projection lens module 10. When the projection light beam is directly projected onto the display surface 200, the projection light beam can directly display the target pattern on the display surface 200.
[0040] The reflector cup 20 is a reflector that needs long-distance spotlighting, usually in a cup shape, commonly known as the reflector cup 20. The inner side of the reflector cup 20 is a reflective surface, and the opening 201 of the reflector cup 20 can also be called a cup mouth. The light beam emitted by the light source is irradiated onto the reflective surface through the cup mouth, and the reflective surface is used to reflect the projection light beam irradiated onto the reflective surface and then emit it from the cup mouth.
[0041] It should be noted that the aspheric surface in each of the following embodiments can be defined by, but not limited to, the following aspheric surface curve equation:
[0042]
[0043] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient.
[0044] The display surface 200 may be a floor, a desktop, a wall, etc., and is an area for displaying a projected target pattern.
[0045] Compared with directly projecting the projection light beam emitted by the projection lens module 10 onto the display surface 200, the projection device provided by the embodiment of the present application firstly tilts the optical axis 101 of the projection lens module 10 relative to the display surface 200 of the projection device, and makes the light-emitting side of the projection lens module 10 away from the display surface 200; a reflective cup 20 is arranged on the light-emitting side of the projection lens module 10, and the reflective surface of the reflective cup 20 is an aspherical surface, and by adjusting the optical axis 101 of the projection lens module 10 and the opening direction X of the reflective cup 20, so that the opening direction X of the reflective cup 20 is tilted relative to the display surface 200 of the projection device, the user can adjust the position of the display surface 200 of the projection of the projection device so that the position of the display surface 200 is tilted as shown in FIG. Figure 2 The dotted lines at the lower left corner are close until they overlap. In this way, when the projection light emitted from the light-emitting side of the projection lens module 10 is irradiated onto the reflective surface through the opening 201, the projection light is reflected by the reflective surface and then reflected from the opening 201 onto the display surface 200, thereby projecting the target pattern onto the display surface 200, that is, a clear image can be formed on the ground. In this way, the projection device can achieve the purpose of clear and uniform display over a large area on the ground.
[0046] like Figure 2 As shown, in some embodiments, the display surface 200 is the ground, so that the step of specially setting up a display surface 200 is omitted, saving costs.
[0047] like Figure 2 As shown, in some embodiments, the optical axis 101 of the projection lens module 10 is perpendicular to the display surface 200 .
[0048] Through the above arrangement, the space occupied by the projection device in the direction perpendicular to the optical axis 101 of the projection lens module 10 is reduced, thereby facilitating the reduction of the space occupied by the projection device.
[0049] It should be noted that the optical axis 101 of the projection lens module 10 is perpendicular to the display surface 200 , and the angle between the optical axis 101 and the display surface 200 is 90°±5°.
[0050] like Figure 2 As shown, in some embodiments, the opening direction X of the reflective cup 20 can rotate relative to the display surface 200 .
[0051] Through the above settings, if the direction of the optical axis 101 of the projection lens module 10 is determined, the user can achieve clear imaging on the display surface 200 by changing the angle between the opening direction X of the reflective cup 20 and the display surface 200. At the same time, when the projection device is applied to the lighting system of different models or other application scenarios requiring projection, only minor changes or no changes are required to the projection device to be applied in other projection scenarios, so the projection device of the present application has strong versatility and practicality.
[0052] like Figure 2 As shown, in some embodiments, the angle between the opening direction X of the reflective cup 20 and the display surface 200 is determined according to the projection ratio of the projection lens module 10 and the distance between the reflective cup 20 and the display surface 200 along the optical axis 101 ( Figure 2 The distance indicated by the arrow H in the figure is determined.
[0053] It should be noted that the projection ratio in the embodiment of the present application is the ratio of the distance between the reflector cup 20 and the display surface 200 along the optical axis 101 to the width of the image projected onto the display surface 200. The angle between the opening direction X of the reflector cup 20 and the display surface 200 is the acute angle between the opening direction X of the reflector cup 20 and the display surface 200.
[0054] Through the above settings, when the projection device is applied to the lighting systems of different car models or other application scenarios that require projection, the user can determine the angle between the opening direction X of the reflector cup 20 and the display surface 200 according to the projection ratio and the distance H between the reflector cup 20 and the display surface 200 along the optical axis 101, so that the projection device can display the target image clearly and evenly over a large range on the display surface 200 when applied to different scenarios.
[0055] like Figure 2 As shown, in some embodiments, the projection lens module 10 includes a display device 11 and a lens group 12. The display device 11 can provide a target pattern. The lens group 12 is located between the display device 11 and the reflective cup 20. The lens group 12 is used to change the optical parameters of the projection device.
[0056] The above optical parameters mainly include the optical focal length, magnification, etc. of the projection device.
[0057] Through the above settings, the user can use different lens combinations when the display device 11 is determined, and no specific limitation is made here.
[0058] In some embodiments, the display device 11 is any one of LCD, LCOS, and DLP.
[0059] The main function of the display device 11 is to provide a target pattern for the projection device. Among them, LCD, LCOS and DLP are three display devices using different projection technologies. Users can choose different display devices 11 according to different projection display requirements and costs.
[0060] For example, Figure 2 The display device 11 used is an LCOS display device. Among them, the LCOS (Liquid Crystal on Silicon) display device is a display device that uses LCOS projection technology. LCOS can also be regarded as a type of LCD. Traditional LCDs are made on glass substrates, while LCOS are made on silicon wafers. Traditional LCDs usually use a penetrating projection method with low light utilization efficiency; LCOS uses a reflective projection method with a light utilization efficiency of more than 40%. Moreover, its biggest advantage is that it can be produced using the currently widely used and inexpensive CMOS manufacturing technology without the need for additional investment, and the resolution can be gradually improved as the semiconductor process is rapidly miniaturized.
[0061] Among them, the LCD (Liquid Crystal Display) display device is a display device using LCD projection technology, which is to remove the backlight part of the LCD panel, and then use a high-power backlight source to illuminate the LCD panel through a condenser. Since the LCD panel is light-transmissive, the picture will be illuminated and projected onto the display surface 200 through the front lens group 12 to form an image. This principle is very similar to that of the projector used for teaching, and ordinary projectors all use this principle.
[0062] Among them, DLP (Digital Light Processing) display device is a display device that uses DLP projection technology. The core of DLP display device is DMD (Digital Micromirror Device) digital micromirror device chip. DLP display device can change the angle of the target pattern.
[0063] In some embodiments, the display device 11 includes an optical element having a target pattern.
[0064] It should be noted that the above optical element is mainly capable of providing a target pattern. The optical element may be a filter or a film etched or painted with a target pattern. When light passes through the optical element, the target pattern may be projected on the display surface 200 .
[0065] Through the above arrangement, the user can achieve the change of different target patterns only by replacing different optical elements without changing the main part of the display device 11. In this way, the modification cost is low, which is conducive to making the projection device suitable for different application scenarios and a wide range of applications.
[0066] like Figure 2 and Figure 3 As shown, in some embodiments, lens group 12 includes one or more spherical lenses.
[0067] Through the above configuration, not only can the projection lens module 10 meet different optical parameter requirements, but also the cost is low.
[0068] Of course, the lens group 12 may include one or more spherical lenses, as well as one or more aspherical lenses, filters, and prisms. In this way, the projection lens module 10 can meet different optical parameter requirements and adapt to different application scenarios.
[0069] For example, when the lens group 12 includes a plurality of spherical lenses and a filter, or when the lens group 12 includes a plurality of spherical lenses and a prism, the filter or the prism is located on one side of the plurality of spherical lenses.
[0070] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. A projection device, characterized in that: include: A projection lens module (10) having a target pattern; the optical axis of the projection lens module (10) is arranged obliquely relative to the display surface (200) of the projection device, and the projection lens module (10) has a light emitting side, and the light emitting side faces away from the display surface (200); A reflective cup (20) is arranged on the light-emitting side, the opening (201) of the reflective cup (20) faces the display surface (200), and the opening direction of the reflective cup (20) is arranged obliquely relative to the display surface (200); The inner side surface of the reflective cup (20) is a reflective surface (21), and the reflective surface (21) is an aspherical surface; the reflective surface (21) is used to reflect a projection light beam irradiated from the projection lens module (10) through the opening (201) onto the reflective surface (21) onto the display surface (200), so as to project the target pattern onto the display surface (200).
2. The projection device according to claim 1, characterized in that: The display surface (200) is the ground.
3. The projection device according to claim 2, characterized in that: The optical axis of the projection lens module (10) is perpendicular to the display surface (200).
4. The projection device according to claim 1, characterized in that: The opening direction of the reflective cup (20) can be rotated relative to the display surface (200).
5. The projection device according to claim 1, characterized in that: The angle between the opening direction of the reflective cup (20) and the display surface (200) is determined according to the projection ratio of the projection lens module (10) and the distance between the reflective cup (20) and the display surface (200) along the optical axis, wherein the projection ratio is the ratio of the distance between the reflective cup (20) and the display surface (200) along the optical axis to the width of the image projected onto the display surface (200).
6. The projection device according to any one of claims 1 to 5, characterized in that: The projection lens module (10) comprises a display device (11) and a lens group (12); the display device (11) is capable of providing the target pattern; the lens group (12) is located between the display device (11) and the reflective cup (20); and the lens group (12) is used to change the optical parameters of the projection device.
7. The projection device according to claim 6, characterized in that: The display device (11) is any one of LCD, LCOS and DLP; And / or, the display device (11) comprises an optical element, and the optical element has the target pattern.
8. The projection device according to claim 6, characterized in that: The lens group (12) includes at least one or more of a spherical lens, an aspherical lens, a filter, and a prism.
9. A projection system, characterized in that: include: The projection device according to any one of claims 1 to 8; A light source (100) provides the projection light beam for the projection device.
10. A vehicle lighting system, characterized in that: include: The projection device according to any one of claims 1 to 8.