Projection device and lamp

Abstract

A projection device and a lamp. The projection device comprises a light source assembly (1), a rotating member (2), and at least two reflective surfaces (3); the light source assembly (1) is used for generating emergent light (S); the rotating member (2) has a first axis (M); the at least two reflective surfaces (3) are both provided on the rotating member (2), the at least two reflective surfaces (3) are arranged around the first axis (M), at least one of the at least two reflective surfaces (3) is inclined relative to the first axis (M), and the at least two reflective surfaces (3) respectively form different angles relative to the first axis (M); and the rotating member (2) can drive the reflective surfaces (3) to rotate about the first axis (M), such that the reflective surfaces (3) sequentially rotate onto a light path of the emergent light (S). By using the scheme, the lack of flexibility in movement paths of star spots in a projection device can be addressed, thereby enhancing user experience of the projection device.

Description

Projection devices and lighting fixtures Technical Field

[0001] This application relates to the field of projection technology, and in particular to a projection device and a lamp. Background Technology

[0002] A projection device is a device that projects a magnified image onto a target surface. In related technologies, projection devices incorporate dynamic elements to make the image more vivid and interesting, thereby enhancing the user experience. For example, a projection device can simulate the effect of stars streaking across the sky.

[0003] Specifically, the functional component that enables the movement of projected star points typically has two slits spaced apart along the light path emitted from the light source component, with one slit capable of rotating around a first axis. When one slit rotates to a point where it continuously intersects with the fixed slit, the emitted light from the light source component passes through the two slits sequentially, forming a moving, elongated star point as one slit rotates. However, the movement path of the star points generated using this method is relatively simple, resulting in a poor user experience for the projection device.

[0004] Application content

[0005] In view of this, embodiments of this application provide a projection device and a lamp, which aim to improve the relatively simple meteor movement path of the projection device, thereby enhancing the user experience of the projection device.

[0006] According to a first aspect of this application, an embodiment provides a projection device including a light source assembly, a rotating member, and at least two reflective surfaces. The light source assembly generates emitted light. The rotating member has a first axis. At least two reflective surfaces are disposed on the rotating member, arranged around the first axis, at least one of the reflective surfaces is inclined relative to the first axis, and the angles formed by the at least two reflective surfaces with respect to the first axis are different. The rotating member can drive each reflective surface to rotate around the first axis, so that each reflective surface rotates sequentially into the light path of the emitted light.

[0007] In some embodiments, each reflecting surface is tilted relative to the first axis, and the angles formed by each reflecting surface and the first axis are different.

[0008] In some embodiments, the projection device includes a reflective device disposed between the light source assembly and the rotating component, the reflective device being used to reflect outgoing light to at least one of at least two reflective surfaces.

[0009] In some embodiments, the projection device includes a beam expander disposed in the optical path of the reflected light from at least two reflective surfaces. The beam expander is used to unidirectionally expand the outgoing light reflected by the reflective surfaces and to propagate the unidirectionally expanded outgoing light.

[0010] In some embodiments, the projection device includes a beam expander disposed between the light source assembly and the rotating member. The beam expander is used to unidirectionally expand the emitted light generated by the light source assembly and propagate the unidirectionally expanded emitted light to at least one of the at least two reflecting surfaces.

[0011] In some embodiments, the reflecting device is a plane mirror or a one-way curved mirror.

[0012] In some implementations, each reflecting surface is a unidirectional arc-shaped reflecting surface.

[0013] In some embodiments, the beam expander includes one of a cylindrical lens, a cylindrical microlens array, a one-way curved mirror, and a cylindrical grating.

[0014] In some embodiments, the beam expander includes a turntable and at least two optical elements. The at least two optical elements are disposed on the turntable, which has a second axis, and the optical elements are arranged around the second axis. The turntable can drive the optical elements to rotate around the second axis so that the optical elements rotate sequentially to the optical path of the outgoing light reflected by the reflector. The optical elements are used to unidirectionally expand the outgoing light transmitted through themselves and transmit the unidirectionally expanded outgoing light to at least one of the at least two reflecting surfaces. The optical parameters of each optical element are different, and the unidirectional beam expansion length of each optical element for the outgoing light transmitted through itself is also different.

[0015] In some embodiments, the optical element is a cylindrical lens or a cylindrical lens grating.

[0016] In some embodiments, the light source assembly includes at least three light-emitting devices and at least two beam-combining elements. The light emitted by each light-emitting device has a different wavelength. After being combined by the at least two beam-combining elements, the light source assembly emits light of a composite color. The at least three light-emitting devices include a first light-emitting device and at least two other light-emitting devices. The emission direction of the first light-emitting device is the same as the emission direction of the emitted light. The emission directions of the at least two second light-emitting devices are perpendicular to the emission direction of the first light-emitting device. The at least two beam-combining elements are respectively located at the perpendicular intersection of the two different colors of light.

[0017] In some embodiments, the projection device includes a number of reflective elements equal to the number of reflective surfaces, each reflective element being fixed on the outer peripheral surface of the rotating member, and the reflective elements being arranged sequentially around a first axis; wherein the surface of the reflective element facing away from the rotating member is the reflective surface.

[0018] In some embodiments, a reflective surface is a portion of the outer peripheral surface of the rotating component.

[0019] According to a second aspect of this application, an embodiment of this application provides a lighting fixture, which includes a circuit board and a projection device of any of the above-mentioned types, wherein the projection device is electrically connected to the circuit board. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0021] Figure 1 is a structural schematic diagram of a projection device provided in the first embodiment of this application;

[0022] Figure 2 is a diagram showing the propagation path of the emitted light rays after reflection by the first reflecting surface of the projection device shown in Figure 1;

[0023] Figure 3 shows the propagation path of the emitted light after reflection by the second reflecting surface of the projection device shown in Figure 1;

[0024] Figure 4 is another structural schematic diagram of a projection device provided in the first embodiment of this application;

[0025] Figure 5 is a schematic diagram of the structure of the projection device shown in Figure 1, in which each reflective surface is located on the rotating component;

[0026] Figure 6 is another structural schematic diagram of the projection device shown in Figure 1, in which the reflective surfaces are located on the rotating component;

[0027] Figure 7 is a schematic diagram of another structure of a projection device provided in the first embodiment of this application;

[0028] Figure 8 shows the propagation path of the light emitted from the projection device shown in Figure 7;

[0029] Figure 9 is another structural schematic diagram of a projection device provided in the first embodiment of this application;

[0030] Figure 10 is a schematic diagram of another projection device provided in the first embodiment of this application;

[0031] Figure 11 is a diagram showing the propagation path of the light emitted from the projection device shown in Figure 10;

[0032] Figure 12 is a structural schematic diagram of a projection device provided in the second embodiment of this application;

[0033] Figure 13 is another structural schematic diagram of a projection device provided in the second embodiment of this application;

[0034] Figure 14 is a diagram showing the propagation path of the light emitted from the projection device shown in Figure 13;

[0035] Figure 15 is another structural schematic diagram of a projection device provided in the second embodiment of this application;

[0036] Figure 16 is a diagram showing the propagation path of the light emitted from the projection device shown in Figure 15;

[0037] Figure 17 is a propagation path diagram of the light emitted from a projection device according to the second embodiment of this application;

[0038] Figure 18 is a schematic diagram of another projection device provided in the second embodiment of this application;

[0039] Figure 19 is a diagram showing the propagation path of the light emitted from the projection device shown in Figure 18;

[0040] Figure 20 is a schematic diagram of another projection device provided in the second embodiment of this application;

[0041] Figure label:

[0042] 1. Light source assembly; 11. Light-emitting device; 111. First light-emitting device; 112. Second light-emitting device; 12. Beam combiner;

[0043] 2. Rotating component; 201. First mounting slot; 202. Second mounting slot;

[0044] 3. Reflecting surface; 31. First reflecting surface; 32. Second reflecting surface;

[0045] 4. Beam expander; 41. Turntable; 42. Optical components;

[0046] 5. Reflective devices;

[0047] S, outgoing ray; M, first axis; N, second axis; L1, normal to the first reflecting surface; L2, normal to the second reflecting surface; α1, angle between the normal to the first reflecting surface and the first axis; α2, angle between the normal to the second reflecting surface and the first axis. Embodiments of the present invention

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0049] It should be noted that when a component / part is said to be "fixed to" another component / part, it can be directly on the other component / part or there may be an intermediate component / part. When a component / part is considered to be "connected to" another component / part, it can be directly connected to the other component / part or there may be an intermediate component / part present; also, when a component / part is considered to be "connected to" another component / part, it can be integrally formed or assembled with the other component / part. When a component / part is considered to be "set on" another component / part, it can be directly set on the other component / part or there may be an intermediate component / part present.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] Example 1

[0052] Please refer to Figures 1 to 20. The projection device includes a light source assembly 1, a rotating member 2, and at least two reflective surfaces 3. The light source assembly 1 generates an outgoing light ray S. The rotating member 2 rotates about a first axis M, which is the axis of rotation of the rotating member 2. At least two reflective surfaces 3 are disposed on the rotating member 2, and the reflective surfaces 3 are arranged sequentially around the first axis M. At least one of the at least two reflective surfaces 3 is inclined relative to the first axis M, and the angles formed by the at least two reflective surfaces 3 with respect to the first axis M are different. The rotating member 2 can drive the at least two reflective surfaces 3 to rotate about the first axis M, so that each reflective surface 3 rotates sequentially into the optical path of the outgoing light ray S.

[0053] In the projection device of this application, each reflective surface 3 and the rotating member 2 rotates around a first axis M. When the reflective surface 3, irradiated by the emitted light ray S, rotates together with the rotating member 2, the emission angle of the emitted light ray S changes, and the imaging position on the target surface also changes accordingly, thereby achieving the effect of star point movement on the target surface. The target surface that can receive and display the star points projected by the projection device can include reflective surfaces such as the ground, walls, and ceilings. Furthermore, since at least one reflective surface 3 is inclined relative to the first axis M, and at least two reflective surfaces 3 form different angles with the first axis M, when the rotating member 2 drives each reflective surface 3 to rotate sequentially into the optical path of the emitted light ray S, the movement path of the emitted light ray S reflected by at least one reflective surface 3 on the target surface is different from the movement path of other reflective surfaces 3 on the target surface. This improves the relatively simple star point movement path of the projection device, thereby enhancing the user experience and enriching the viewing experience.

[0054] In some embodiments, the rotating member 2 is used for transmission connection with a power source, which can drive the rotating member 2 to rotate around a first axis M. When the rotating member 2 is transmission connected with the power source, the rotational speed of the rotating member 2 can be adaptively adjusted, thereby changing the movement speed of each star point on the target surface to match the usage requirements of the projection device in different application scenarios. It is understood that the type of power source can be varied, and the embodiments of this application do not specifically limit it. Examples of such power sources include motors, cylinders, hydraulic cylinders, and other similar functional structures.

[0055] Figure 1 is a structural schematic diagram of a projection device provided in the first aspect of this application; Figure 2 is a propagation path diagram of the emitted light after reflection by the first reflective surface of the projection device shown in Figure 1; and Figure 3 is a propagation path diagram of the emitted light after reflection by the second reflective surface of the projection device shown in Figure 1.

[0056] Please refer to Figures 1 to 3. In some embodiments, at least two reflective surfaces 3 include at least one first reflective surface 31 and at least one second reflective surface 32. The first reflective surface 31 and / or the second reflective surface 32 are inclined relative to the first axis M, and the first reflective surface 31 and the second reflective surface 32 form different angles with the first axis M.

[0057] It should be noted that the inclination of at least one of the first reflecting surface 31 and the second reflecting surface 32 relative to the first axis M specifically refers to the following: the two ends of the first reflecting surface 31 along the direction parallel to the first axis M are not aligned, and / or the two ends of the second reflecting surface 32 along the direction parallel to the first axis M are not aligned. The angles formed by the first reflecting surface 31 and the second reflecting surface 32 with the first axis M specifically refer to the angle α1 between the normal L1 of the first reflecting surface 31 and the auxiliary line, as shown in Figures 1, 5, or 6, and the angle α2 between the normal L2 of the second reflecting surface 32 and the auxiliary line, where α2 ≠ α1. The auxiliary lines drawn on the first reflecting surface 31 and the second reflecting surface 32 are both parallel to the first axis M.

[0058] It should also be noted that when the first reflecting surface 31 and the second reflecting surface 32 are planar, the inclination of at least one of the first reflecting surface 31 and the second reflecting surface 32 relative to the first axis M means that at least one of the first reflecting surface 31 and the second reflecting surface 32 is not parallel to the first axis M; the angles formed by the first reflecting surface 31 and the second reflecting surface 32 with the first axis M specifically refer to the angle α1 between the normal L1 of the first reflecting surface 31 and the first axis M, and the angle α2 between the normal L2 of the second reflecting surface 32 and the first axis M, where α2 ≠ α1.

[0059] When the first reflecting surface 31 and the second reflecting surface 32 are curved surfaces, the inclination of at least one of the first reflecting surface 31 and the second reflecting surface 32 relative to the first axis M means that the center line of at least one of the first reflecting surface 31 and the second reflecting surface 32 is not parallel to the first axis M; the angles formed by the first reflecting surface 31 and the second reflecting surface 32 with the first axis M specifically refer to the angle between the center line of the first reflecting surface 31 and the first axis M, and the angle between the center line of the second reflecting surface 32 and the first axis M.

[0060] To facilitate understanding, the following example illustrates the trajectory of a star point projected onto the target surface after the emitted light rays are reflected by a first reflecting surface 31 and a second reflecting surface 32.

[0061] The rotating member 2 can drive the first reflecting surface 31 and the second reflecting surface 32 to rotate around the first axis M, so that the first reflecting surface 31 and the second reflecting surface 32 are sequentially rotated into the optical path of the emitted light ray S. When the rotating member 2 drives the first reflecting surface 31 to rotate into the optical path of the emitted light ray S, the emitted light ray S reflected by the first reflecting surface 31 moves within the first moving path. When the rotating member 2 drives the second reflecting surface 32 to rotate into the optical path of the emitted light ray S, the emitted light ray S reflected by the second reflecting surface 32 moves within the second moving path, and the second moving path and the first moving path do not overlap at least partially.

[0062] It should be noted that the movement of the outgoing light ray S reflected by the first reflecting surface 31 within the first moving path specifically refers to: the outgoing light ray S reflected by the first reflecting surface 31 forms a star point on the target surface. When the first reflecting surface 31, which is irradiated by the outgoing light ray S, rotates together with the rotating member 2, the emission angle of the outgoing light ray S formed by the reflection of the first reflecting surface 31 changes, and the imaging position of the star point formed on the target surface also changes accordingly. The path of this change of the star point is called the first moving path.

[0063] Similarly, the movement of the outgoing light ray S reflected by the second reflecting surface 32 within the second moving path specifically means that the outgoing light ray S reflected by the second reflecting surface 32 forms a star point on the target surface. When the second reflecting surface 32, which is irradiated by the outgoing light ray S, rotates together with the rotating component 2, the outgoing angle of the outgoing light ray S formed by the reflection of the second reflecting surface 32 changes, and the imaging position of the star point formed on the target surface also changes accordingly. The path of this change of the star point is called the second moving path.

[0064] In some embodiments, each reflecting surface 3 is inclined relative to the first axis M, and the angles formed by each reflecting surface 3 and the first axis M are different. For example, in addition to the first reflecting surface 31 and the second reflecting surface 32, at least two reflecting surfaces 3 may also include a third reflecting surface, a fourth reflecting surface, ..., an Nth reflecting surface. When at least two reflecting surfaces 3 include the first reflecting surface 31, the second reflecting surface 32, ..., an Nth reflecting surface, the angles formed by the first reflecting surface to the Nth reflecting surface and the first axis M are different. Optionally, N is a natural number greater than or equal to 4 and less than or equal to 8.

[0065] In this way, when the rotating component 2 drives each reflective surface 3 to rotate sequentially to the optical path of the emitted light S, the emission angle of the emitted light S formed by each reflective surface 3 and the imaging position of the star points formed on the target surface after being reflected by the reflective surface 3 are different, thereby creating the effect that each star point moves to a different position on the target surface, thus further enhancing the user experience of the projection device.

[0066] Alternatively, in other embodiments, each first reflecting surface 31 is inclined relative to the first axis M, and each first reflecting surface 31 forms the same angle with the first axis M; each second reflecting surface 32 is inclined relative to the first axis M, and each second reflecting surface 32 forms the same angle with the first axis M. However, the angle between any first reflecting surface 31 and the first axis M and the angle between any second reflecting surface 32 and the first axis M are different.

[0067] It is understood that the arrangement of at least two reflective surfaces 3 on the rotating member 2 is actually diverse, and no specific limitation is made in other embodiments of this application.

[0068] For example, at least one first reflecting surface 31 and at least one second reflecting surface 32 are arranged sequentially around the first axis M. In this way, when the rotating member 2 drives at least one first reflecting surface 31 and at least one second reflecting surface 32 to rotate sequentially to the optical path of the emitted light ray S, the emission angle of the emitted light ray S formed by each first reflecting surface 31 and the imaging position of the star points formed on the target surface after reflection by the first reflecting surface 31 are approximately the same. Similarly, the emission angle of the emitted light ray S formed by each second reflecting surface 32 and the imaging position of the star points formed on the target surface after reflection by the first reflecting surface 31 are approximately the same. This achieves the effect that some star points first move repeatedly on one movement path on the target surface, and then other star points move repeatedly on another movement path on the target surface, thereby further enhancing the user experience of the projection device.

[0069] For example, at least one first reflective surface 31 and at least one second reflective surface 32 are arranged alternately around the first axis M. In this way, when the rotating member 2 drives at least one first reflective surface 31 and at least one second reflective surface 32 to rotate sequentially to the optical path of the emitted light ray S, the effect of each star point repeatedly moving along different moving paths on the target surface is achieved, thereby further enhancing the user experience of the projection device.

[0070] For example, at least one first reflective surface 31 and at least one second reflective surface 32 can be arranged sequentially around the first axis M to form a reflective surface group, and then multiple reflective surface groups can be arranged alternately around the first axis M, which further enhances the user experience of the projection device.

[0071] In some embodiments, the number of reflective surfaces 3 is greater than or equal to 4 and less than or equal to 8. This is because the applicant has found through extensive experiments that the number of reflective surfaces 3 should not exceed 8. Exceeding 8 will result in the outgoing light rays S having too short a scanning path on a single reflective surface 3, leading to a shorter scanning path for the star points on the target surface and a poorer effect of creating the movement of star points.

[0072] As shown in Figure 4, in order to create an immersive lighting atmosphere and further enhance the user experience of the projection device, in some embodiments, the light source component 1 includes at least three light-emitting devices 11 and at least two beam combining elements 12. The wavelengths of the light emitted by each light-emitting device 11 are different, and the light emitted by each light-emitting device 11 is combined by at least two beam combining elements 12 to form the emitted light of the light source component 1 in a composite color.

[0073] Specifically, at least three light-emitting devices 11 include a first light-emitting device 111 and at least two second light-emitting devices 112. The first light-emitting device 111 is spaced apart from at least two reflective surfaces 3. The emission direction of the first light-emitting device 111 is the emission direction of the emitted light S generated by the light source assembly 1. The emission directions of the at least two second light-emitting devices 112 are perpendicular to the emission direction of the first light-emitting device 111. At least two beam-combining elements 12 are respectively located at the perpendicular intersection of different colored lights. Each beam-combining element 12 can transmit the light emitted by the first light-emitting device 111 and reflect the light emitted from each second light-emitting device 112 in a direction parallel to the emission direction of the first light-emitting device 111 to at least one of the at least two reflective surfaces 3.

[0074] In some embodiments, the beam combiner 12 has the characteristic of reflecting or transmitting a beam of light with a wavelength of the emitted light S, while not processing beams of light with wavelengths other than that of the emitted light S, thereby reducing the involvement of ambient light in the beam combining and its impact on the color of the emitted light S after beam combining. Examples of beam combining elements 12 that have a beam combining function include dichroic mirrors, prisms, and light couplers. For example, the beam combiner 12 can be a dichroic mirror. Because dichroic mirrors have a small size and complexity, they can achieve beam combining in a relatively small space, reducing the structural complexity of the projection device and facilitating a reduction in the overall size of the projection device.

[0075] In some embodiments, at least three light-emitting devices 11 may emit light according to an instruction carrying at least one of the following light-emitting information: the light-emitting time of some or all of the at least three light-emitting devices 11, the light-emitting intensity of some or all of the at least three light-emitting devices 11, and the light-emitting frequency of some or all of the at least three light-emitting devices 11. Examples of such light-emitting devices 11 include LED beads or laser emitters. For instance, all at least three light-emitting devices 11 may be laser emitters. Compared to LED beads, laser emitters offer a more refined display effect while maintaining basic requirements such as lifespan and brightness, making them more suitable for projection device applications.

[0076] For ease of description, the following example uses three light-emitting devices 11: a red laser emitter, a blue laser emitter, and a green laser emitter. Since any two of the red, blue, and green laser emitters need to be combined with the other one, two dichroic mirrors are required. As shown in Figure 4, the two dichroic mirrors are respectively arranged at the perpendicular intersection of the light emitted by one monochromatic laser emitter and the light emitted by the other two monochromatic laser emitters, so that the different wavelengths of light generated by the three emitters are combined by the dichroic mirrors to form the composite color emitted light S from the light source component 1.

[0077] The emission time of at least two of the red laser emitter, blue laser emitter, and green laser emitter can be controlled to make the light source assembly 1 produce emitted light with different effects.

[0078] For example, if mixed light is required for a certain period of time, and the mixed light is formed by combining the light emitted from any two of the red, blue, and green laser emitters, then the instruction can include the emission time of these two monochromatic laser emitters. Specifically, the light source component 1 can emit magenta or yellow-green mixed light as embellishment, and control the color of the two corresponding monochromatic laser emitters that combine to form the mixed light to change slowly, thereby creating a hazy starry effect.

[0079] For example, if white light is needed for a certain period of time, and this white light is formed by the combined emission of red, blue, and green laser emitters, then the instruction can simply include the emission time of these three monochromatic laser emitters. Specifically, the light source component 1 can emit white light as an accent and adjust the brightness of the three monochromatic laser emitters to create a sense of depth and movement of starlight.

[0080] Alternatively, in some embodiments, the light source assembly 1 includes a light-emitting device 11, the light source of which can generate emitted light rays S, wherein the light source of the light-emitting device 11 can be a collimated light source. The light-emitting device 11 with collimated light source characteristics can be a monochromatic laser emitter, a panchromatic laser generator, a tunable broadband laser emitter, or a collimated halogen lamp, an ultra-high pressure lamp, or an LED lamp.

[0081] In some embodiments, the light source assembly 1 further includes a light source circuit board (not shown), which serves as a mounting base for the light-emitting device 11. The light-emitting device 11 is disposed on the light source circuit board and electrically connected to a power source through the light source circuit board. When the light source circuit board is powered on, the light-emitting device 11 is illuminated, and the light-emitting device 11 can generate emitted light rays S. As an example, the light source circuit board can be a rigid circuit board, and the light-emitting device 11 is attached to the rigid circuit board.

[0082] In some embodiments, the number of light-emitting devices 11 is the same as the number of light source circuit boards. When there is one light-emitting device, one light-emitting device 11 is attached to one light source circuit board; when there are at least two light-emitting devices, one light-emitting device can be attached to one light source circuit board.

[0083] In some embodiments, the rotating component 2, the at least one first reflective surface 31, and the at least one second reflective surface 32 can each be an independent structural component. The at least one first reflective surface 31 is located on at least one first reflective element (not shown), and the at least one second reflective surface 32 is located on at least one second reflective element (not shown). The rotating component 2 can serve as a support structure for the at least one first reflective surface 31 and the at least one second reflective element. Exemplarily, the rotating component 2 has a hollow cylindrical structure as shown in Figures 1 to 3. At least one first reflective element and at least one second reflective element are sequentially arranged around a first axis M on the outer circumferential surface of the rotating component 2. With this arrangement, each reflective element does not need to be fixedly connected to the rotating component 2 via additional connectors. Therefore, the overall structure of the combination of each reflective element and the rotating component 2 is simple and also helps to improve the space utilization of the projection device. Of course, the structure of the rotating member 2 is not limited to a hollow cylindrical structure. For example, in some other embodiments, the rotating member 2 may also be a polygonal prism structure, with at least one first reflective element and at least one second reflective element respectively disposed on each side of the rotating member 2.

[0084] In some embodiments, the outer peripheral surface of the rotating member 2 is provided with at least two mounting grooves, wherein the mounting grooves may be formed by a partial recess of the outer peripheral surface toward the first axis M of the rotating member 2. The number of mounting grooves is the same as the sum of the number of the first reflective element and the number of the second reflective element, with one first reflective element embedded in one mounting groove and one second reflective element embedded in the other mounting groove.

[0085] For ease of description, please refer to Figure 5 or Figure 6 below, where the mounting groove for embedding the first reflective element is defined as the first mounting groove 201. The mounting groove for embedding the second reflective element is defined as the second mounting groove 202, as an example.

[0086] The first reflective element is embedded in the first mounting groove 201, and the surface of the first reflective element facing away from the rotating member 2 is the aforementioned first reflective surface 31. Exemplarily, the first reflective element and the first mounting groove 201 can be fixed together by, but not limited to, adhesive. When the first reflective element is bonded to the first mounting groove 201 with adhesive, adhesive is first applied to the first mounting groove 201, and then the first reflective element is placed in the first mounting groove 201. Before the adhesive cures, the relative position of the first reflective element can be adjusted to change the reflection angle of the first reflective surface 31.

[0087] The second reflective element is embedded in the second mounting groove 202, and the surface of the second reflective element facing away from the rotating member 2 is the aforementioned second reflective surface 32. It is understood that the installation method between the second reflective element and the second mounting groove 202 can be the same as or different from the installation method between the first reflective element and the first mounting groove 201, as long as the second reflective element can be embedded in the second mounting groove 202, and no specific limitation is made here.

[0088] In some embodiments, the first and second reflecting elements are constructed in a substantially similar manner. For example, both the first and second reflecting elements are one of a plane mirror, a reflecting prism, a beam splitter prism, or a one-way curved surface mirror. Exemplarily, both the first and second reflecting elements are one-way curved surface mirrors as shown in FIG5 or FIG6. When the outgoing light S generated by the light source assembly 1 illuminates the first reflecting surface 31 or the second reflecting surface 32, since the first or second reflecting element is a one-way curved surface mirror, it can not only reflect the outgoing light S to the target surface to form star points, but also unidirectionally expand the star points on the target surface along a direction parallel to its movement path, thereby forming an effect similar to a meteor. In this way, when the rotating member 2 drives at least one first reflecting element and at least one second reflecting element to rotate sequentially into the optical path of the outgoing light S, a meteor-like movement effect is generated at different positions on the target surface. Therefore, compared to the first or second reflecting element being a plane mirror or a reflecting prism, the projection device involved in this application does not require additional components with unidirectional beam expansion function. That is, the components required for the projection device to achieve the meteor movement effect are smaller, thereby improving the space utilization of the projection device.

[0089] It should be noted that beam-splitting prisms also have the function of unidirectionally expanding the emitted light beam, but their unidirectional beam-expanding principle differs from that of unidirectional curved reflectors. Specifically, they can achieve unidirectional beam expansion by changing the angle of the incident light beam and utilizing the special optical properties of the prism, or by changing the diameter and divergence angle of the beam. Besides these two, plane reflectors or reflecting prisms primarily function to reflect emitted light beams; therefore, by using components with unidirectional beam-expanding capabilities, the effect of projecting meteors onto a target surface can be achieved.

[0090] Of course, the construction of the first reflecting element 1 and the second reflecting element 2 can also be different. For example, the first reflecting element 1 can be one of a plane mirror, a reflecting prism, a beam splitter prism, or a one-way curved surface mirror. The second reflecting element 2 can be another of a plane mirror, a reflecting prism, a beam splitter prism, or a one-way curved surface mirror. For example, the first reflecting element 1 is a plane mirror and the second reflecting element 2 is a one-way curved surface mirror. Since the principles by which the aforementioned optical devices form star points or meteors on the target surface have been mentioned above, please refer to the relevant descriptions above, and will not be elaborated further here.

[0091] Alternatively, in other embodiments, at least two reflective surfaces 3 may be integrated into the rotating member 2. For example, the rotating member 2 may have a generally irregular polyhedral structure, and the aforementioned at least one first reflective surface 3 and at least one second reflective surface 32 may be formed by mirror finishing of the surfaces surrounding the rotating member 2. Alternatively, the aforementioned at least one first reflective surface 31 and at least one second reflective surface 32 may be formed by coating the surfaces surrounding the rotating member 2 with a reflective layer.

[0092] The first reflective surface 31 is the first part of the outer peripheral surface of the rotating component 2, which is obtained after mirror treatment or coating with a reflective layer. The second reflective surface 312 is the second part of the outer peripheral surface of the rotating component 2, which is obtained after mirror treatment or coating with a reflective layer. The second part and the first part are arranged around the first axis M.

[0093] In other embodiments, the first reflecting surface 31 and the second reflecting surface 32 have substantially the same structure, wherein both the first reflecting surface 31 and the second reflecting surface 32 are one of a planar reflecting surface, a reflecting prism surface, or a one-way curved reflecting surface. Exemplarily, both the first reflecting element 1 and the second reflecting element 2 are planar reflecting surfaces. Of course, the types of the first reflecting surface 31 and the second reflecting surface 32 can also be different. The first reflecting element 1 is one of a planar reflecting surface or a one-way curved reflecting surface. The second reflecting element 2 is another of a planar reflecting surface or a one-way curved reflecting surface. Exemplarily, the first reflecting element 1 is a planar reflecting surface, and the second reflecting element 2 is a one-way curved reflecting surface.

[0094] Alternatively, in other embodiments, the first reflective surface 31 and the second reflective surface 32 may be configured in other ways. For example, one of the first reflective surface 31 and the second reflective surface 32 may be a part of the rotating member 2, which is obtained after mirror treatment or coating with a reflective layer. The other of the first reflective surface 31 and the second reflective surface 32 may be the surface of an independent reflective element that is away from the rotating member 2.

[0095] As shown in Figures 1, 5, or 6, in some embodiments, the first reflecting surface 31 and the second reflecting surface 32 are adjacent to each other on the outer peripheral surface of the rotating member 2. Thus, when the rotating member 2 rotates about the first axis M, the emitted light S generated by the light source assembly 1 can seamlessly switch from the first reflecting surface 31 to the adjacent second reflecting surface 32, thereby presenting the effect of seamless movement of star points or meteors at different positions.

[0096] It is worth mentioning that if the first reflective surface 31 and the second reflective surface 32 are integrated into the rotating member 2, or if one of the first reflective surface 31 and the second reflective surface 32 is integrated into the rotating member 2 and the other is a surface on an independent reflective element facing away from the rotating member 2, and the first reflective surface 31 and the second reflective surface 32 are adjacent to each other on the outer peripheral surface of the rotating member 2, or the first reflective surface 31 and its adjacent reflective surface, and the second reflective surface 32 and its adjacent reflective surface, the emitted light S reflected by the transition surface between the two reflective surfaces becomes messy and disordered. Based on improving the user experience of the projection device, the transition surface can be treated to absorb light to reduce reflection. For example, a black light-absorbing layer can be attached to the transition surface.

[0097] Alternatively, in some embodiments, the first reflecting surface 31 and the second reflecting surface 32 are spaced apart on the outer peripheral surface of the rotating member 2. Thus, when the rotating member 2 rotates about the first axis M, the emitted light S generated by the light source is partially blocked by the rotating member 2 where the first and second reflecting elements are not provided, preventing reflection or causing the reflection point to remain unchanged, thereby creating the effect of meteors appearing at different positions at intervals before moving again.

[0098] As shown in Figures 7 to 11, to simulate a more natural meteor movement effect and further enhance the user experience of the projection device, in some embodiments, the projection device includes a beam expander 4. The beam expander 4 is disposed in the optical path of the reflected light from at least two reflecting surfaces 3. The beam expander 4 is used to unidirectionally expand the outgoing light rays S reflected by each reflecting surface 3 and transmit the unidirectionally expanded outgoing light rays. Among them, the beam expander 4 that has the function of diverging the outgoing light rays S can be one of the following: a cylindrical lens, a cylindrical microlens array, a single-sided arc-shaped reflector, or a cylindrical lens grating.

[0099] For ease of description, the following example illustrates how the beam expander 4 unidirectionally expands the outgoing light S reflected by one of the reflecting surfaces 3, and then transmits the unidirectionally expanded outgoing light.

[0100] When the beam expander 4 is a cylindrical lens as shown in Figures 7 and 8, the outgoing light S transmitted through the cylindrical lens is stretched in a direction parallel to the moving path of the target surface, causing the star point originally projected on the target surface to be expanded into a meteor in one direction. When the reflecting surface 3, which is irradiated by the outgoing light S, rotates together with the rotating component, the outgoing angle of the formed outgoing light changes, and the imaging position on the target surface also changes accordingly, thereby achieving the effect of meteor movement on the target surface.

[0101] When the beam expander 4 is a cylindrical microlens array as shown in Figure 9, the light divergence principle of the cylindrical microlens array is the same as that of the cylindrical lens. Therefore, the process of star points spreading out to form a meteor will not be described in detail. However, the difference between the cylindrical microlens array and the cylindrical lens array is that the cylindrical microlens array can uniformly distribute light, and the cylindrical microlens array is smaller in size than the cylindrical lens, which is more conducive to improving the space utilization of the projection device.

[0102] When the beam expander 4 is a single-sided curved reflector as shown in Figures 10 and 11, the central axis of the single-sided curved reflector is approximately parallel to the first axis M. The light ray S reflected by the reflecting surface 3 is redirected again by the second optical device, and due to the curvature change of the single-sided curved reflector, star points can be generated successively in different areas of the same moving path on the target surface, thus forming a meteor. The dynamic image of the meteor on the moving path, driven by the rotating component 2, is also more vivid. Compared with the previous two lenses, the beam expander 4, being a single-sided curved reflector, can change the exit direction of the light ray S, making the structural layout of the projection device more flexible.

[0103] When the beam expander 4 is a cylindrical lens grating, the light S reflected by the reflective surface 3 can sweep across the cylindrical lens grating. Multiple star points move simultaneously on the target surface under the drive of the rotating component 2, creating an effect similar to a meteor shower, which enriches the user's viewing experience.

[0104] Alternatively, in some embodiments, the beam expander 4 is disposed between the light source assembly 1 and the rotating member 2. The beam expander 4 is used to unidirectionally expand the emitted light beam S generated by the light source assembly 1 and propagate the unidirectionally expanded emitted light beam to at least one of the at least two reflecting surfaces 3. Compared to the aforementioned beam expander 4 being disposed in the optical path of the reflected light from at least two reflecting surfaces 3, the beam expander 4 is disposed between the light source assembly 1 and the rotating member 2. The emitted light beam S first diverges through the beam expander 4 and then is reflected from the reflecting surface 3 onto the target surface. Furthermore, since the emitted light beam S in this embodiment first undergoes unidirectional expansion through the beam expander 4 before illuminating at least one reflecting surface 3, the diverged meteor can cover at least one reflecting surface 3, thus simultaneously presenting the effect of two or more meteors streaking across the sky.

[0105] Example 2

[0106] Please refer to Figure 12, which is a schematic diagram of a projection device provided in the second aspect of this application. The components of this projection device are generally the same as those of the projection device in Embodiment 1. However, the arrangement of the light source assembly 1 and the rotating member 2 is different. In Embodiment 1, at least two reflective surfaces 3 are located in front of the light outlet of the light-emitting device 11, and the emitted light generated by the light source assembly 1 directly reaches the rotating member. In Embodiment 2, at least two reflective surfaces 3 are not located in front of the light outlet of the light-emitting device 11. A reflective optical device 42 is provided between the at least two reflective surfaces 3 and the light source assembly 1. The emitted light output by the light source assembly 1 is reflected to the rotating member through the reflective optical device 42. For example, as shown in any of Figures 12 to 20, the projection device includes a reflective device 5, which is located between the light source assembly 1 and the rotating member 2. The reflective device 5 is used to reflect the emitted light S to at least one of the at least two reflective surfaces 3. With this configuration, the direct light path between the light source assembly 1 and the rotating component 2 is supported by the reflective device 5. Therefore, the relative positions of the light source assembly 1 and the rotating component 2 can be adjusted according to actual application requirements, thereby improving the flexibility of the structural layout of the projection device.

[0107] Furthermore, a mirror optical coating can be applied to the reflective device 5 to remove stray light at large angles generated by the light source assembly 1. That is, the reflective device 5 only reflects the collimated portion of the light source assembly 1 onto at least one reflective surface 3, thereby improving the clarity and contrast of the star points projected onto the target surface.

[0108] In some embodiments, the reflecting device 5 is a plane mirror or a one-way curved mirror. When the reflecting device 5 is a one-way curved mirror, the reflecting device 5 can also unidirectionally expand the outgoing light beam S. In this case, the beam expander 4 can be omitted, and the outgoing light beam S can be unidirectionally expanded by the reflecting device 5 alone. Of course, the beam expander 4 can also be configured to achieve dual beam expansion of the outgoing light beam S.

[0109] When the reflecting device 5 is a plane mirror, it only reflects the outgoing light ray S. In this case, a beam expander 4 can also be configured to unidirectionally expand the outgoing light ray S. For example, as shown in Figures 13 and 14, the projection device includes a beam expander 4, which is disposed in the optical path of the reflected light ray from at least two reflecting surfaces 3. The beam expander 4 is used to unidirectionally expand the outgoing light ray S reflected by at least two reflecting surfaces 3. Among them, the beam expander 4, which has the function of diverging the outgoing light ray S, can be one of the following: a cylindrical lens, a cylindrical microlens array, a single-sided arc-shaped mirror, or a cylindrical lens grating. It should be noted that the roles of each specific optical device 42 in the above technical solution have been explained in detail and will not be repeated here.

[0110] Alternatively, as shown in any of Figures 15 to 20, in some embodiments, the beam expander 4 is disposed between the reflecting device 5 and the rotating member 2. The beam expander 4 is used to unidirectionally expand the outgoing light reflected by the reflecting device 5 and propagate the unidirectionally expanded outgoing light to at least one reflecting surface 3. When the reflecting device 5 is a plane mirror, the beam expander 4 can be a cylindrical lens or a cylindrical microlens array. Stacking a cylindrical lens or a cylindrical microlens array on the plane mirror has a similar effect to that of a unidirectional curved surface mirror. Therefore, the lens or mirror for unidirectionally expanding the outgoing light S can be eliminated from the reflected light path of the reflecting surface 3.

[0111] Alternatively, in some other embodiments, the beam expander 4 is disposed between the light source assembly 1 and the reflector 5. The beam expander 4 is used to unidirectionally expand the outgoing light S generated by the light source assembly 1 and propagate the unidirectionally expanded outgoing light to the reflector 5.

[0112] As shown in Figures 18 to 20, to facilitate adjustment of the stretching effect of the emitted light ray S and thus the meteor effect, in some embodiments, the beam expander 4 also includes the aforementioned turntable 41 and the aforementioned at least two optical devices 42. The turntable 41 has a second axis N, and at least two optical devices 42 are disposed on the turntable 41, with each optical device 42 arranged around the second axis N. The turntable 41 can drive each optical device 42 to rotate around the second axis N, so that each optical device 42 rotates sequentially into the optical path of the emitted light ray S and unidirectionally expands the emitted light ray S. Since the optical parameters of each optical device 42 are different, the unidirectional beam expansion length of the emitted light ray S transmitted through it by different optical devices 42 is also different, facilitating the generation of different meteor effects. For example, the refractive index or curvature of each optical device 42 is different; exemplarily, the optical device 42 is a cylindrical lens or a cylindrical grating.

[0113] Furthermore, the turntable 41 can be driven by other driving components to adjust the position of the optical element 42 relative to the rotating member. For example, the driving component is connected to the turntable 41 and can adjust the optical element 42 on the turntable 41 located in the direction of the emitted light ray S to move closer to or away from the rotating member 2, thereby changing the focal length of the emitted light ray S and adjusting the stretching effect of the emitted light ray S to adjust the meteor effect.

[0114] In some embodiments, the turntable 41 is used for transmission connection with another power source, which can drive the turntable 41 to rotate about the second axis N.

[0115] To facilitate understanding, the following example illustrates the different refractive indices of the optical devices 42 on the beam expander 4. The turntable 41 of the beam expander 4 is connected to the power source. When the power source rotates to an optical device 42 with a certain refractive index, the optical device 42 with that refractive index can transmit the emitted light S or the emitted light S reflected by the reflecting surface 3. Then, the light source assembly 1 is powered on, resulting in different numbers and positions of meteors appearing on the target surface at the same time. It is understood that the type of power source can be varied, and the embodiments of this application do not specifically limit it. For example, the power source includes a motor, a cylinder, a hydraulic cylinder, and other similar functional structures. Of course, the turntable 41 and the rotating component 2 can share the same power source, which can achieve different driving force outputs through different reduction transmission mechanisms.

[0116] Based on the same technical concept, a second aspect of this application provides a lighting fixture, which includes a circuit board and a projection device mentioned in the first embodiment or the second embodiment. All of the above projection devices can be electrically connected to the circuit board.

[0117] In some embodiments, the circuit board may include a control module, which may be a control chip. The control module is electrically connected to the power source and is used to control the rotational speed of the rotating component 2.

[0118] In some embodiments, the circuit board may further include a power module, which is electrically connected to the light-emitting device 11, the rotating member 2, and the beam expander 4, respectively.

[0119] The lighting fixtures of this application can be categorized into logo projection lights, advertising projection lights, starry sky projection lights, etc., depending on the different patterns they project. When this projection device is applied to a starry sky projection light, the superimposed display of the projected pattern and the star points reflected by at least two reflective surfaces makes the image of moving meteors more layered and dynamic.

[0120] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0121] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A projection device, characterized in that, include: Light source assembly, used to generate outgoing light rays; A rotating component having a first axis; At least two reflective surfaces are disposed on the rotating member, the at least two reflective surfaces are arranged around the first axis, at least one of the at least two reflective surfaces is inclined relative to the first axis, and the at least two reflective surfaces form different angles with the first axis. The rotating component can drive the at least two reflecting surfaces to rotate around the first axis, so that each reflecting surface rotates sequentially into the optical path of the emitted light.

2. The projection device according to claim 1, characterized in that, Each of the aforementioned reflective surfaces is inclined relative to the first axis, and the angles formed by each of the aforementioned reflective surfaces and the first axis are different.

3. The projection device according to claim 1, characterized in that, The projection device includes a reflective device disposed between the light source assembly and the rotating member, and the reflective device is used to reflect the emitted light to at least one of the at least two reflective surfaces.

4. The projection device according to claim 3, characterized in that, The reflective device is a plane mirror or a one-way curved mirror.

5. The projection device according to claim 1, characterized in that, The projection device includes a beam expander; The beam expander is disposed in the optical path of the reflected light from the at least two reflecting surfaces. The beam expander is used to unidirectionally expand the emitted light reflected by the reflecting surfaces and to propagate the unidirectionally expanded emitted light; or, The beam expander is disposed between the light source assembly and the rotating member. The beam expander is used to unidirectionally expand the emitted light generated by the light source assembly and propagate the unidirectionally expanded emitted light to at least one of the at least two reflecting surfaces.

6. The projection device according to claim 3, characterized in that, The projection device includes a beam expander; The beam expander is disposed in the optical path of the reflected light from the at least two reflecting surfaces. The beam expander is used to unidirectionally expand the emitted light reflected by the reflecting surfaces and to propagate the unidirectionally expanded emitted light; or, The beam expander is disposed between the light source assembly and the rotating member. The beam expander is used to unidirectionally expand the emitted light generated by the light source assembly and propagate the unidirectionally expanded emitted light to at least one of the at least two reflecting surfaces.

7. The projection device according to claim 5 or 6, characterized in that, Each of the aforementioned reflecting surfaces is a unidirectional arc-shaped reflecting surface; and / or, The beam expander includes one of the following: a cylindrical lens, a cylindrical microlens array, a one-way curved mirror, and a cylindrical grating.

8. The projection device according to claim 6, characterized in that, The beam expander includes a turntable and at least two optical elements, the at least two optical elements being disposed on the turntable, the turntable having a second axis, and each of the optical elements being arranged around the second axis. The turntable can drive each of the optical elements to rotate around the second axis, so that each of the optical elements rotates sequentially to the optical path of the emitted light reflected by the reflective device; The optical element is used to unidirectionally expand the outgoing light transmitted through itself and transmit the unidirectionally expanded outgoing light to at least one of the at least two reflecting surfaces. The optical parameters of each optical element are different, and the unidirectional expansion length of each optical element for the outgoing light transmitted through itself is also different.

9. The projection device according to claim 8, characterized in that, The optical element is a cylindrical lens or a cylindrical grating.

10. The projection device according to claim 1 or 3, characterized in that, The light source assembly includes at least three light-emitting devices and at least two beam-combining elements, wherein the light emitted by each light-emitting device has a different wavelength, and the light emitted by each light-emitting device is combined by the at least two beam-combining elements to form the light emitted by the light source assembly in a composite color. The at least three light-emitting devices include a first light-emitting device and at least two second light-emitting devices. The emission direction of the first light-emitting device is the emission direction of the emitted light, and the emission directions of the at least two second light-emitting devices are perpendicular to the emission direction of the first light-emitting device. The at least two beam-combining elements are respectively located at the perpendicular intersection of two different wavelengths of light.

11. The projection device according to claim 1 or 3, characterized in that, The projection device includes the same number of reflective elements as the reflective surface, each of the reflective elements is fixed on the outer peripheral surface of the rotating member, and each of the reflective elements is arranged sequentially around the first axis. The surface of the reflective element that faces away from the rotating component is the reflective surface.

12. The projection device according to claim 1 or 3, characterized in that, The reflective surface is a portion of the outer peripheral surface of the rotating component.

13. A lamp, characterized in that, include: Circuit board; as well as The projection device as described in any one of claims 1-12, wherein the projection device is electrically connected to the circuit board.

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