Projection equipment and lighting

Abstract

The embodiment of the present application provides a projection device and a lamp. The projection device includes a light source assembly, a rotating member, and at least two reflective surfaces; the light source assembly is used to generate an outgoing light; the rotating member has a first axis; at least two reflective surfaces are provided on the rotating member, 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 at least two reflective surfaces have different angles with the first axis; wherein the rotating member can drive each reflective surface to rotate around the first axis, so that each reflective surface rotates sequentially to the optical path of the outgoing light. The above scheme can improve the situation where the meteor movement path of the projection device is relatively single, thereby enhancing the experience of the projection device.

Description

Technical Field

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

[0002] A projection device is a device that projects a pattern onto a target surface at a magnified scale. In related technologies, a projection device introduces dynamic elements to make the pattern vivid and interesting, so as to enhance the experience. For example, a projection device can simulate the effect of stars passing by.

[0003] Specifically, the functional component for realizing the movement of the projection star point usually has two slits, which are arranged at intervals along the outgoing light path of the light source component, and one of the slits can rotate around the first axis. When one of the slits rotates to continuously intersect with the slit at the fixed position, the outgoing light generated by the light source component passes through the two slits in turn, and forms a moving elongated star point as one of the slits rotates. However, the moving path of the star point generated by this solution is relatively single, resulting in a poor user experience of the projection device. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a projection device and a lamp, aiming to improve the situation that the moving path of the meteors of the projection device is relatively single, thereby enhancing the user experience of the projection device.

[0005] According to the first aspect of the present application, an embodiment of the present application provides a projection device, which includes a light source assembly, a rotating member, and at least two reflective surfaces. The light source assembly is used to generate an outgoing light. The rotating member has a first axis. At least two reflective surfaces are both provided on the rotating member, 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 at least two reflective surfaces have different angles with the first axis. Among them, the rotating member can drive each reflective surface to rotate around the first axis so that each reflective surface rotates sequentially to the optical path of the outgoing light.

[0006] In some embodiments, each reflective surface is inclined relative to the first axis, and angles formed between each reflective surface and the first axis are different.

[0007] In some embodiments, the projection device includes a reflective device, which is disposed between the light source assembly and the rotating member, and is used to reflect the emitted light to at least one of the at least two reflective surfaces.

[0008] In some embodiments, the projection device includes a beam expander, which is arranged on the optical path of the light reflected by at least two reflecting surfaces. The beam expander is used to unidirectionally expand the outgoing light reflected by the reflecting surfaces and propagate the outgoing light after unidirectional expansion.

[0009] In some embodiments, the projection device includes a beam expander, which is disposed between the light source assembly and the rotating member. The beam expander is used to unidirectionally expand the outgoing light generated by the light source assembly and propagate the unidirectionally expanded outgoing light to at least one of the at least two reflective surfaces.

[0010] In some embodiments, the reflective device is a plane reflector or a one-way curved reflector.

[0011] In some embodiments, each reflective surface is a unidirectional curved reflective surface.

[0012] In some embodiments, the beam expander includes one of a cylindrical lens, a cylindrical microlens array, a one-way curved reflector, and a cylindrical grating.

[0013] In some embodiments, the expander includes a turntable and at least two optical elements, at least two optical elements are arranged on the turntable, the turntable has a second axis, and each optical element is arranged around the second axis; wherein the turntable can drive each optical element to rotate around the second axis, so that each optical element rotates in turn to the optical path of the outgoing light reflected by the reflective device; the optical device is used to unidirectionally expand the outgoing light passing through itself, and transmit the outgoing light after unidirectional expansion to at least one of the at least two reflective surfaces, wherein the optical parameters of each optical element are different, and the unidirectional expansion length of the outgoing light passing through itself is also different.

[0014] In some embodiments, the optical element is a cylindrical lens or a cylindrical grating.

[0015] In some embodiments, the light source assembly includes at least three light-emitting devices and at least two beam-combining elements, wherein the wavelengths of light emitted by each light-emitting device are different, and each light-emitting device is combined by at least two beam-combining elements to form an output light of a composite color of the light source assembly; the at least three light-emitting devices include a first light-emitting device and at least two light-emitting devices, the output direction of the first light-emitting device is the output direction of the output light, the output direction of at least two second light-emitting devices is perpendicular to the output direction of the first light-emitting device, and the at least two beam-combining elements are respectively arranged at the vertical intersection of two lights of different colors.

[0016] In some embodiments, the projection device includes reflective elements with the same number as the reflective surface, each reflective element is fixed to the outer peripheral surface of the rotating member, and each reflective element is arranged in sequence around the first axis; wherein the surface of the reflective element facing away from the rotating member is the reflective surface.

[0017] In some embodiments, a reflective surface is a portion of the outer circumference of the rotating member.

[0018] According to a second aspect of the present application, an embodiment of the present application provides a lamp, which includes a circuit board and any one of the projection devices mentioned above, and the projection device is electrically connected to the circuit board.

[0019] Compared with the prior art, in the projection device involved in the present application, each reflective surface and the rotating member rotate around the first axis. When the reflective surface irradiated by the outgoing light rotates together with the rotating member, the outgoing angle of the outgoing light formed by the reflection of the reflective surface changes, and the imaging position of the star point formed on the target surface also changes accordingly, thereby achieving the effect of star point movement on the target surface. Furthermore, since at least one reflective surface is inclined relative to the first axis, and at least two reflective surfaces have different angles with the first axis, when the rotating member drives each reflective surface to rotate to the optical path of the outgoing light in turn, the moving path of the outgoing light reflected by at least one reflective surface on the target surface is different from the moving path of other reflective surfaces on the target surface, thereby creating the effect of each star point moving at different positions on the target surface, thereby improving the relatively single moving path of the star point of the projection device, thereby enhancing the user experience of the projection device and enriching the user's viewing experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0021] Figure 1 A schematic diagram of the structure of a projection device provided in the first embodiment of the present application;

[0022] Figure 2 for Figure 1 A diagram showing the propagation path of the outgoing light beam of the projection device after being reflected by the first reflection surface;

[0023] Figure 3 for Figure 1 A diagram showing the propagation path of the outgoing light from the projection device after being reflected by the second reflection surface;

[0024] Figure 4 Another structural schematic diagram of a projection device provided in the first embodiment of the present application;

[0025] Figure 5 for Figure 1 A schematic diagram of a structure in which each reflective surface of a projection device is arranged on a rotating member;

[0026] Figure 6 for Figure 1Another structural schematic diagram showing that each reflective surface of the projection device is arranged on a rotating member;

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

[0028] Figure 8 for Figure 7 The propagation path diagram of the light emitted by the projection device is shown;

[0029] Fig. 9 A schematic diagram of another structure of a projection device provided in the first embodiment of the present application;

[0030] Fig.10 Another structural schematic diagram of a projection device provided in the first embodiment of the present application;

[0031] Fig.11 for Fig.10 The propagation path diagram of the light emitted by the projection device is shown;

[0032] Fig.12 A schematic diagram of the structure of a projection device provided in the second embodiment of the present application;

[0033] Fig.13 Another structural schematic diagram of a projection device provided in the second embodiment of the present application;

[0034] Fig.14 for Fig.13 The propagation path diagram of the light emitted by the projection device is shown;

[0035] Fig.15 A schematic diagram of another structure of a projection device provided in the second embodiment of the present application;

[0036] Fig.16 for Fig.15 The propagation path diagram of the light emitted by the projection device is shown;

[0037] Fig.17 A propagation path diagram of light emitted from a projection device provided in the second embodiment of the present application;

[0038] Fig.18 Another structural schematic diagram of a projection device provided in the second embodiment of the present application;

[0039] Fig.19 for Fig.18 The propagation path diagram of the light emitted by the projection device is shown;

[0040] Fig. 20 Another structural schematic diagram of a projection device provided in the second embodiment of the present application;

[0041] Reference numerals:

[0042] 1. light source assembly; 11. light emitting device; 111. first light emitting device; 112. second light emitting device; 12. beam combining element;

[0043] 2. Rotating member; 201. First mounting groove; 202. Second mounting groove;

[0044] 3. Reflection surface; 31. First reflection surface; 32. Second reflection surface;

[0045] 4. beam expander; 41. turntable; 42. optical device;

[0046] 5. Reflection device;

[0047] S, outgoing light; 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. DETAILED DESCRIPTION

[0048] 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.

[0049] It should be noted that when an element / component is referred to as being "fixed to" another element / component, it may be directly on the other element / component or there may be an intermediate element / component. When an element / component is considered to be "connected" to another element / component, it may be directly connected to the other element / component or there may be an intermediate element / component at the same time; at the same time, when an element / component is considered to be "connected" to another element / component, it may be integrally formed or assembled with the other element / component. When an element / component is considered to be "set on" another element / component, it may be directly set on the other element / component or there may be an intermediate element / component at the same time.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0051] Embodiment 1

[0052] See also Figures 1 to 20 The projection device includes a light source assembly 1, a rotating member 2 and at least two reflecting surfaces 3. The light source assembly 1 is used to generate an outgoing light S. The rotating member 2 is used to rotate around a first axis M, and the first axis M is the rotation axis of the rotating member 2. At least two reflecting surfaces 3 are provided on the rotating member 2, and each reflecting surface 3 is arranged in sequence around the first axis M. At least one reflecting surface 3 of the at least two reflecting surfaces is inclined relative to the first axis M, and the angles formed by the at least two reflecting surfaces 3 and the first axis M are different. The rotating member 2 can drive the at least two reflecting surfaces 3 to rotate around the first axis M, so that each reflecting surface 3 rotates in sequence to the optical path of the outgoing light S.

[0053] In the projection device involved in the present application, each reflective surface 3 and the rotating member 2 rotate around the first axis M. When the reflective surface 3 irradiated by the outgoing light S rotates with the rotating member 2, the outgoing angle of the outgoing light S formed changes, and the imaging position on the target surface also changes accordingly, thereby achieving the effect of star point movement on the target surface. Among them, the target surface that can receive and display the star points projected by the projection device can be listed as reflective surfaces such as the ground, wall, and ceiling. Further, since at least one reflective surface 3 is inclined relative to the first axis M, and at least two reflective surfaces 3 have different angles with the first axis M, therefore, when the rotating member 2 drives each reflective surface 3 to rotate to the optical path of the outgoing light S in turn, the moving path of the outgoing light S reflected by at least one reflective surface 3 on the target surface is different from the moving path of other reflective surfaces 3 on the target surface, thereby improving the relatively single moving path of the star points of the projection device, thereby improving the experience of the projection device and enriching the viewing experience of the user.

[0054] In some embodiments, the rotating member 2 is used for transmission connection with a power source, and the power source can drive the rotating member 2 to rotate around the first axis M. When the rotating member 2 is transmission connected with the power source, the rotation speed of the rotating member 2 can be adaptively adjusted, thereby changing the moving speed of each star point on the target surface to match the use requirements of the projection device in different application scenarios. It can be understood that the type of power source is actually diverse, and the embodiments of the present application do not specifically limit it. As such a power source, motors, cylinders, oil cylinders and other similar functional structures can be listed.

[0055] Figure 1 A schematic diagram of a projection device provided in the first aspect of the present application is shown in FIG. Figure 2 for Figure 1 The propagation path diagram of the outgoing light from the projection device after being reflected by the first reflection surface is shown, Figure 3 for Figure 1 The figure shows the propagation path of the outgoing light from the projection device after being reflected by the second reflection surface.

[0056] See also Figures 1 to 3 In some embodiments, at least two reflecting surfaces 3 include at least one first reflecting surface 31 and at least one second reflecting surface 32, the first reflecting surface 31 and / or the second reflecting surface 32 are inclined relative to the first axis M, and the angles formed between the first reflecting surface 31 and the second reflecting surface 32 and the first axis M are different.

[0057] It should be noted that the tilt of at least one of the first reflecting surface 31 and the second reflecting surface 32 relative to the first axis M mentioned herein specifically refers to: the two ends of the first reflecting surface 31 in the direction parallel to the first axis M are not flush, and / or the two ends of the second reflecting surface 32 in the direction parallel to the first axis M are not flush. The angles formed by the first reflecting surface 31 and the second reflecting surface 32 with the first axis M respectively specifically refer to, Figure 1 , Figure 5 or Figure 6 The angle α1 between the normal line L1 of the first reflecting surface 31 and the auxiliary line, and the angle α2 between the normal line L2 of the second reflecting surface 32 and the auxiliary line are shown, α2≠α1, wherein the auxiliary line on the first reflecting surface 31 and the auxiliary line on 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 planes, at least one of the first reflecting surface 31 and the second reflecting surface 32 is inclined relative to the first axis M, which 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 and the first axis M respectively 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, α2≠α1.

[0059] When the first reflecting surface 31 and the second reflecting surface 32 are curved surfaces, at least one of the first reflecting surface 31 and the second reflecting surface 32 is inclined relative to the first axis M, which 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 and the first axis M respectively 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] For ease of understanding, the following is an example of the motion trajectory of a star point projected on the target surface after the outgoing light is reflected by a first reflection surface 31 and a second reflection surface 32 respectively.

[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 to the optical path of the outgoing light S. When the rotating member 2 drives the first reflecting surface 31 to rotate to the optical path of the outgoing light S, the outgoing light 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 to the optical path of the outgoing light S, the outgoing light S reflected by the second reflecting surface 32 moves within the second moving path, and the second moving path and the first moving path at least partially do not overlap.

[0062] It should be noted that the movement of the outgoing light S reflected by the first reflecting surface 31 within the first moving path mentioned here specifically refers to: the outgoing light S reflected by the first reflecting surface 31 forms a star point on the target surface. When the first reflecting surface 31 illuminated by the outgoing light S rotates together with the rotating member 2, the emission angle of the outgoing light 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 changing path of the star point is called the first moving path.

[0063] Similarly, the movement of the outgoing light S reflected by the second reflecting surface 32 within the second moving path specifically refers to: the outgoing light S reflected by the second reflecting surface 32 forms a star point on the target surface. When the second reflecting surface 32 illuminated by the outgoing light S rotates together with the rotating member 2, the emission angle of the outgoing light 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 changing path 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 with the first axis M are different. Exemplarily, 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,..., and an Nth reflecting surface. When at least two reflecting surfaces 3 include the first reflecting surface 31, the second reflecting surface 32,..., and the Nth reflecting surface, the angles formed by the first to Nth reflecting surfaces with 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 member 2 drives each reflecting surface 3 to rotate in sequence to the optical path of the outgoing light S, the emission angles of the outgoing light S formed by the reflection of each reflecting surface 3 and the imaging positions of the star points formed by the reflection of the reflecting surface 3 to the target surface are different, thereby creating an effect that each star point moves to different positions on the target surface, thereby further enhancing the experience of the projection device.

[0066] Alternatively, in some other embodiments, each first reflection surface 31 is inclined relative to the first axis M, and each first reflection surface 31 forms the same angle with the first axis M; each second reflection surface 32 is inclined relative to the first axis M, and each second reflection surface 32 forms the same angle with the first axis M. The angle formed by any first reflection surface 31 and the first axis M is different from the angle formed by any second reflection surface 32 and the first axis M.

[0067] It is understandable that the arrangement of the at least two reflection surfaces 3 on the rotating member 2 is actually various, and is not specifically limited in other embodiments of the present application.

[0068] For example, at least one first reflection surface 31 and at least one second reflection surface 32 are sequentially arranged around the first axis M. In this way, when the rotating member 2 drives at least one first reflection surface 31 and at least one second reflection surface 32 to rotate sequentially to the optical path of the outgoing light S, the outgoing angles of the outgoing light S formed by the reflection of each first reflection surface 31 and the imaging positions of the star points formed by the reflection of the first reflection surface 31 on the target surface are substantially the same, and the outgoing angles of the outgoing light S formed by the reflection of each second reflection surface 32 and the imaging positions of the star points formed by the reflection of the first reflection surface 31 on the target surface are substantially the same, thereby achieving the effect that a part of the star points first repeatedly move on a moving path on the target surface, and then another part of the star points repeatedly move on another moving path on the target surface, thereby further improving the experience of the projection device.

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

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

[0071] In some embodiments, the number of the reflection surfaces 3 satisfies greater than or equal to 4 and less than or equal to 8. This is because the inventors have found through a large number of experiments that the number of the reflection surfaces 3 should not exceed 8. Exceeding 8 will result in the scanning path of the outgoing light S on a single reflection surface 3 being too short, resulting in a shorter scanning path of the star point on the target surface, and creating a poor effect of star point movement.

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

[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 emission light S generated by the light source assembly 1. The emission directions of 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 arranged at the vertical intersection of lights of different colors. 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 along 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 combining element 12 has the characteristics of reflecting or transmitting the light beam of the wavelength of the outgoing light S, and not processing the light beams other than the wavelength of the outgoing light S, thereby reducing the ambient light in the environment from participating in the beam combining and affecting the color of the outgoing light S after the beam combining. The beam combining element 12 having the beam combining function may include a dichroic mirror, a prism, a light coupler, etc. Exemplarily, the beam combining element 12 may be a dichroic mirror, because the dichroic mirror has a small size and complexity, it can realize the beam combining function in a relatively small space, which can reduce the structural complexity of the projection device and help reduce the overall size of the projection device.

[0075] In some embodiments, at least three light-emitting devices 11 can emit light according to an instruction, and the instruction carries 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. As such light-emitting devices 11, LED lamp beads or laser emitters can be listed. Exemplarily, at least three light-emitting devices 11 are laser emitters. Compared with LED lamp beads, laser emitters have a delicate display effect while ensuring basic requirements such as service life and brightness, which is more suitable for the application scenario of projection devices.

[0076] For ease of description, the following is an example in which three light emitting devices 11 are respectively a red laser emitter, a blue laser emitter, and a green laser emitter. Since any two of the red laser emitter, the blue laser emitter, and the green laser emitter need to be combined with the other, the required number of dichroic mirrors is two. Figure 4 As shown, two dichroic mirrors are respectively arranged at the vertical intersection of the light emitted by a monochromatic laser emitter and the light emitted by the other two monochromatic laser emitters, so that the lights of different wavelengths generated by the three are combined after being processed by the dichroic mirrors to form an output light S of the light source assembly 1 with a composite color.

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

[0078] For example, if mixed light is needed in a certain period of time, and the mixed light is formed by combining the light emitted by any two of the red laser emitter, the blue laser emitter, and the green laser emitter, then the instruction only needs to carry the light emission time of the two monochromatic laser emitters. Specifically, the light source assembly 1 can emit magenta or yellow-green mixed light as an embellishment, and control the color of the corresponding two monochromatic laser emitters combined into the mixed light to change slowly, thereby creating a hazy star effect.

[0079] For another example, if white light is needed in a certain time period, and white light is formed by the light beams of a red laser emitter, a blue laser emitter, and a green laser emitter, then the instruction only needs to carry the light emission time of the three monochromatic laser emitters. Specifically, the light source assembly 1 can emit white light as an embellishment, and adjust the brightness of the three monochromatic laser emitters, thereby creating a sense of layering of moving star points.

[0080] Alternatively, in some other embodiments, the light source assembly 1 includes a light emitting device 11, and the light source of the light emitting device 11 can generate an outgoing light beam S, wherein the light source of the light emitting device 11 can be a collimated light source. The light emitting device 11 having the characteristics of a collimated light source can be a monochromatic laser emitter, a full-color laser generator, a tunable wide-spectrum laser emitter, etc., or a collimated halogen lamp, an ultra-high pressure lamp, or an LED lamp, etc.

[0081] In some embodiments, the light source assembly 1 further includes a light source circuit board (not shown), which is a mounting base for the light emitting device 11. The light emitting device 11 is disposed on the light source circuit board, and the light emitting device 11 is electrically connected to a power source through the light source circuit board. After the light source circuit board is powered on, the light emitting device 11 is lit, and the light emitting device 11 can generate an outgoing light S. As an example, the light source circuit board can be a hard circuit board, and the light emitting device 11 is attached to the hard 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 the number of light emitting devices is one, one light emitting device 11 is attached to one light source circuit board, and when the number of light emitting devices is at least two, one light emitting device can be attached to one light source circuit board.

[0083] For the above-mentioned rotating member 2, the above-mentioned at least one first reflecting surface 31 and the at least one second reflecting surface 32, in some embodiments, the rotating member 2, the at least one first reflecting surface 31 and the at least one second reflecting surface 32 can be independent structural members, wherein the at least one first reflecting surface 31 is respectively located on at least one first reflecting element (not shown in the figure), and the at least one second reflecting surface 32 is respectively located on at least one second reflecting element (not shown in the figure), and the rotating member 2 can serve as a supporting structure for the at least one first reflecting surface 31 and the at least one second reflecting element. For example, the rotating member 2 is as follows Figures 1 to 3 In the hollow cylindrical structure shown, at least one first reflective element and at least one second reflective element are sequentially arranged on the outer circumferential surface of the rotating member 2 around the first axis M. In this arrangement, each reflective element does not need to be fixedly connected to the rotating member 2 through an additional connecting member, so the overall structure of the combination of each reflective element and the rotating member 2 is simple, which is also conducive to improving the space utilization rate of the projection device. Of course, the structure of the rotating member 2 is not limited to the hollow cylindrical structure. For example, in other embodiments, the rotating member 2 can also be a polygonal columnar structure, and at least one first reflective element and at least one second reflective element are respectively arranged on each side of the rotating member 2.

[0084] In some embodiments, at least two mounting grooves are provided on the outer circumference of the rotating member 2, wherein the mounting grooves can be formed by a portion of the outer circumference being recessed toward the first axis M of the rotating member 2. The number of the mounting grooves is the same as the sum of the number of the first reflective elements and the second reflective elements, a first reflective element is embedded in one mounting groove, and a second reflective element is embedded in another mounting groove.

[0085] For ease of description, next, see Figure 5 or Figure 6 , the installation groove for embedding the first reflective element is defined as the first installation groove 201. The installation groove for embedding the second reflective element is defined as the second installation groove 202 for 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 by, but not limited to, glue. When the first reflective element and the first mounting groove 201 are bonded by glue, glue 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 glue is cured, 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 can be 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 reflective element and the second reflective element are substantially the same in structure. For example, the first reflective element and the second reflective element are both selected from the group consisting of a plane reflector, a reflective prism, a beam splitter prism, and a one-way curved reflector. Figure 5 or Figure 6 The one-way curved reflector shown, when the outgoing light S generated by the light source assembly 1 is irradiated to the first reflective surface 31 or the second reflective surface 32, since the first reflective element or the second reflective element is a one-way curved reflector, it can not only reflect the outgoing light S to the target surface to form a star point, but also expand the star point on the target surface in a one-way direction parallel to its moving path, thereby forming an effect similar to a meteor. In this case, when the rotating member 2 drives at least one first reflective element and at least one second reflective element to rotate to the optical path of the outgoing light S in sequence, the effect of the movement of a meteor is generated at different positions on the target surface. Therefore, compared with the first reflective element or the second reflective element being a plane reflector or a reflective prism, the projection device involved in the present application does not need to additionally arrange a component with a one-way expansion function, that is, the components required for the projection device to achieve the meteor movement effect are smaller, thereby improving the space utilization rate of the projection device.

[0089] It should be noted here that the beam splitter prism also has the function of unidirectional expansion of the outgoing light, and its unidirectional expansion principle is different from that of the unidirectional arc reflector. Specifically, it can decompose the incident light beam into multiple beams by changing the angle of the incident light and using the special optical properties of the prism, or change the diameter and divergence angle of the light beam to achieve the unidirectional expansion effect. In addition to the two, the plane reflector or the reflecting prism has more functions of reflecting the outgoing light, so the effect of projecting a meteor on the target surface can be achieved with the help of a component with a unidirectional expansion function.

[0090] Of course, the structures of the first reflective element 1 and the second reflective element 2 may also be different. For example, the first reflective element 1 is one of a plane reflector, a reflective prism, a beam splitter prism, and a one-way curved reflector. The second reflective element 2 is another of a plane reflector, a reflective prism, a beam splitter prism, and a one-way curved reflector. Exemplarily, the first reflective element 1 is a plane reflector, and the second reflective element 2 is a one-way curved reflector. Since the principle of the aforementioned optical devices forming star points or meteors on the target surface has been mentioned above, please refer to the above-mentioned related description, and no further elaboration will be given 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 is generally an irregular polyhedron structure, and each surface surrounding the rotating member 2 is mirror-finished to form the aforementioned at least one first reflective surface 3 and at least one second reflective surface 32. Alternatively, each surface surrounding the rotating member 2 is coated with a reflective layer to form the aforementioned at least one first reflective surface 31 and at least one second reflective surface 32.

[0092] The first reflective surface 31 is the first part of the outer circumference of the rotating member 2, which is obtained by mirror treatment or coating with a reflective layer. The second reflective surface 312 is the second part of the outer circumference of the rotating member 2, which is obtained by 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 structures of the first reflection surface 31 and the second reflection surface 32 are substantially the same, wherein the first reflection surface 31 and the second reflection surface 32 are both one of a plane reflection surface, a reflection prism surface, and a one-way curved reflection surface. Exemplarily, the first reflection element 1 and the second reflection element 2 are both plane reflection surfaces. Of course, the types of the first reflection surface 31 and the second reflection surface 32 may also be different. The first reflection element 1 is one of a plane reflection surface and a one-way curved reflection surface. The second reflection element 2 is another of a plane reflection surface and a one-way curved reflection surface. Exemplarily, the first reflection element 1 is a plane reflection surface, and the second reflection element 2 is a one-way curved reflection surface.

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

[0095] like Figure 1 , Figure 5 or Figure 6As shown, in some embodiments, the first reflective surface 31 and the second reflective surface 32 are adjacent to each other on the outer circumference of the rotating member 2. Therefore, when the rotating member 2 rotates around the first axis M, the emitted light S generated by the light source assembly 1 can be seamlessly switched from the first reflective surface 31 to the second reflective surface 32 adjacent thereto, thereby presenting an effect of seamless movement of stars or meteors at different positions.

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

[0097] Alternatively, in some other embodiments, the first reflecting surface 31 and the second reflecting surface 32 are arranged at intervals on the outer circumference of the rotating member 2. Therefore, when the rotating member 2 rotates around the first axis M, the outgoing light S generated by the light source is blocked by the part of the rotating member 2 where the first reflecting element and the second reflecting element are not arranged and cannot be reflected or the position of the reflected light does not change, thereby presenting an effect that meteors at different positions appear and move again after a period of time.

[0098] like Figures 7 to 11 As shown, in order to simulate a more natural meteor movement effect and further enhance the experience of the projection device, in some embodiments, the projection device includes a beam expander 4, which is arranged on the optical path of the reflected light of at least two reflecting surfaces 3, and the beam expander 4 is used to unidirectionally expand the outgoing light S reflected by each reflecting surface 3, and transmit the outgoing light after unidirectional expansion. Among them, as the beam expander 4 having the function of diverging the outgoing light S, one of a cylindrical lens, a cylindrical microlens array, a single-sided arc reflector, and a cylindrical grating can be listed.

[0099] For ease of description, the following is an example in which the beam expander 4 unidirectionally expands the outgoing light S reflected by one of the reflection surfaces 3 and transmits the unidirectionally expanded outgoing light.

[0100] When the beam expander 4 is as Figure 7 and Figure 8When the cylindrical lens shown is used, the outgoing light S transmitted by the cylindrical lens is stretched in a direction parallel to the moving path of the target surface, so that the star point originally projected on the target surface is unidirectionally expanded into a meteor. When the reflecting surface 3 illuminated by the outgoing light S rotates with the rotating part, the exit 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 as Fig. 9 When the cylindrical microlens array is shown, the light S divergence principle of the cylindrical microlens array is the same as that of the cylindrical lens, so the process of the star point spreading to form a meteor is not described in detail. However, the difference from the cylindrical lens is that the cylindrical microlens array can even the light, and the cylindrical microlens array is smaller than the cylindrical lens, which is more conducive to improving the space utilization of the projection device.

[0102] When the beam expander 4 is as Fig.10 and Fig.11 In the case of the single-sided arc reflector shown, the central axis of the single-sided arc reflector is roughly parallel to the first axis M. The light S reflected by the reflecting surface 3 is changed again in the emission direction by the second optical device, and due to the change in the curvature of the single-sided arc reflector, star points can be generated successively in different areas of the same moving path of the target surface, thereby forming a meteor. The dynamic picture of the meteor on the moving path driven by the rotating member 2 is also more vivid. Compared with the previous two lenses, the beam expander 4 is a one-way arc reflector that can change the emission direction of the light S, making the structural layout of the projection device more flexible.

[0103] When the beam expander 4 is a cylindrical grating, the light S reflected by the reflecting surface 3 can be scanned on the cylindrical grating, and multiple star points move simultaneously on the target surface driven by the rotating member 2, creating an effect similar to a falling meteor shower, enriching the user's viewing experience.

[0104] Alternatively, in some other embodiments, the beam expander 4 is disposed between the light source assembly 1 and the rotating member 2, and 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 at least one of the at least two reflecting surfaces 3. Compared with the aforementioned beam expander 4 disposed on the optical path of the reflected light of at least two reflecting surfaces 3, the beam expander 4 is disposed between the light source assembly 1 and the rotating member 2, and the outgoing light S is first diverged by the beam expander 4 and then reflected from the reflecting surface 3 onto the target surface. In addition, since the outgoing light S in this embodiment is first unidirectionally expanded by the beam expander 4 and then irradiated to at least one reflecting surface 3, the diverged meteor can cover at least one reflecting surface 3, so the effect of two or more meteors passing by can be presented at the same time.

[0105] Embodiment 2

[0106] See also Fig.12 , Fig.12 This is a schematic diagram of the structure of a projection device provided in the second aspect of the present application, wherein the components of the projection device are substantially the same as those of the projection device of the first embodiment, wherein the arrangement positions of the light source assembly 1 and the rotating member 2 are different. In the first embodiment, at least two reflecting surfaces 3 are located in front of the light outlet of the light emitting device 11, and the outgoing light generated by the light source assembly 1 directly reaches the rotating member. In the second embodiment, at least two reflecting surfaces 3 are not located in front of the light outlet of the light emitting device 11, and a reflecting optical device 42 is arranged between the at least two reflecting surfaces 3 and the light source assembly 1, and the outgoing light output by the light source assembly 1 is reflected to the rotating member by the reflecting optical device 42, for example, Figures 12 to 20 As shown in any of the figures, the projection device includes a reflective device 5, which is disposed between the light source assembly 1 and the rotating member 2, and is used to reflect the emitted light S to at least one of the at least two reflecting surfaces 3. In this arrangement, the direct light path between the light source assembly 1 and the rotating member 2 is taken over by the reflective device 5, so the relative positions of the light source assembly 1 and the rotating member 2 can be adjusted according to actual application requirements, thereby improving the flexibility of the structural layout of the projection device.

[0107] Furthermore, the mirror surface of the reflector 5 can be optically coated to remove large-angle stray light generated by the light source assembly 1, that is, the reflector 5 only reflects the collimated part of the light source assembly 1 onto at least one reflective surface 3, thereby improving the clarity and contrast of the star points on the projection target surface.

[0108] In some embodiments, the reflector 5 is a plane reflector or a one-way curved reflector. When the reflector 5 is a one-way curved reflector, the reflector 5 can also perform one-way expansion on the outgoing light S. In this case, the expansion element 4 may not be configured, and the outgoing light S is only expanded one-way by the reflector 5. Of course, the expansion element 4 may also be configured to achieve double expansion of the outgoing light S.

[0109] When the reflective device 5 is a plane reflector, the reflective device 5 only reflects the outgoing light S. At this time, the beam expander 4 may also be configured to unidirectionally expand the outgoing light S. For example, Fig.13 and Fig.14 As shown, the projection device includes a beam expander 4, which is arranged on the optical path of the reflected light of at least two reflecting surfaces 3, and is used to unidirectionally expand the outgoing light S reflected by at least two reflecting surfaces 3. Among them, as the beam expander 4 having the function of diverging the outgoing light S, one of a cylindrical lens, a cylindrical microlens array, a single-sided arc reflector, and a cylindrical grating can be listed. It should be noted here that the role played by each specific optical device 42 in the above technical solution has been explained in detail, and will not be repeated here one by one.

[0110] Alternatively, if Figures 15 to 20 As shown in any of the accompanying drawings, in other embodiments, the beam expander 4 is disposed between the reflective device 5 and the rotating member 2, and the beam expander 4 is used to unidirectionally expand the outgoing light reflected by the reflective device 5, and propagate the unidirectionally expanded outgoing light to at least one reflecting surface 3. When the reflective device 5 is a plane reflector, the beam expander 4 can be one of a cylindrical lens or a cylindrical microlens array. The effect of stacking one of the cylindrical lens or the cylindrical microlens array on the plane reflector is similar to that of the unidirectional curved reflector. Therefore, the lens or reflector for unidirectionally expanding the outgoing light S can be eliminated on 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, and 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] like Figures 18 to 20 As shown, in order to facilitate the adjustment of the stretching effect of the outgoing light S to adjust the effect of the meteor, 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, at least two optical devices 42 are arranged on the turntable 41, and each optical device 42 is arranged around the second axis N. Among them, the turntable 41 can drive each optical device 42 to rotate around the second axis N, so that each optical device 42 rotates to the optical path of the outgoing light S in turn and expands the outgoing light S unidirectionally. Since the optical parameters of each optical device 42 are different, the unidirectional expansion length of the outgoing light S passing through different optical devices 42 is also different, which is convenient for producing 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] In addition, the turntable 41 can be driven by other driving members to adjust the position of the optical device 42 relative to the rotating member. Exemplarily, the driving member is in transmission connection with the turntable 41, and can adjust the optical device 42 located on the turntable 41 at the outgoing light S to move toward or away from the rotating member 2, so that the focal length of the outgoing light S changes, thereby adjusting the stretching effect of the outgoing light S to adjust the effect of the shooting star.

[0114] In some embodiments, the turntable 41 is configured to be in transmission connection with another power source, and the other power source can drive the turntable 41 to rotate around the second axis N.

[0115] For ease of understanding, the following example is given in which the refractive indices of the optical devices 42 on the beam expander 4 are different. The turntable 41 of the beam expander 4 is connected to the power source in a transmission manner. When the power source rotates to an optical device 42 with a certain refractive index, the optical device 42 with the refractive index can pass through the outgoing light S or the outgoing light S reflected by the reflecting surface 3, and then the light source assembly 1 is powered on, so that meteors of different numbers and positions appear on the target surface at the same time. It can be understood that the type of power source is actually diverse, and the embodiments of the present application do not specifically limit it. For example, the power source includes a motor, a cylinder, an oil cylinder, and other similar functional structures. Of course, the turntable 41 and the rotating member 2 can share the same power source, and the power source can achieve different driving force outputs through different reduction transmission mechanisms.

[0116] Based on the same technical concept, the second aspect of the present application provides a lamp, which includes a circuit board and the projection device mentioned in the first embodiment or the projection device mentioned in the second embodiment. 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 rotation speed of the rotating member 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 lamps of the present application can be divided into LOGO projection lamps, advertising projection lamps, starry sky projection lamps, etc. according to the different designated patterns projected. When the projection device is applied to the starry sky projection lamp, the designated pattern projected by the starry sky projection lamp and the star points reflected by at least two reflective surfaces 3 are superimposed and displayed, making the picture of the moving meteor more layered and dynamic.

[0120] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0121] In addition, 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements 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 the present application.

Claims

1. A projection device, characterized in that: include: A light source assembly, for generating outgoing light; A rotating member having a first axis; At least two reflecting surfaces are provided on the rotating member, each of the reflecting surfaces is a unidirectional arc reflecting surface, at least two of the reflecting surfaces are arranged around the first axis, and at least two of the reflecting surfaces are sequentially arranged in the circumference of the rotating member, at least one of the at least two reflecting surfaces located on the same circumference is inclined relative to the first axis, and the at least two reflecting surfaces located on the same circumference respectively form different angles with the first axis; In which, the rotating member can drive the at least two reflecting surfaces to rotate around the first axis so that each of the reflecting surfaces rotates in turn to the optical path of the outgoing light, and the moving path of the outgoing light reflected by at least one of the reflecting surfaces on the target surface is different from the moving paths of other reflecting surfaces on the target surface.

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

3. The projection device according to claim 1, characterized in that: The projection device comprises a reflective device, which is arranged between the light source assembly and the rotating member, and is used for reflecting 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 reflector or a one-way curved reflector.

5. The projection device according to claim 1 or 3, characterized in that: The projection device comprises a beam expander; The beam expander is disposed on the optical path of the light reflected by the at least two reflecting surfaces, and is used to unidirectionally expand the outgoing light reflected by the reflecting surfaces and propagate the outgoing light after unidirectional expansion; or, The beam expander is disposed between the light source assembly and the rotating member, and is used to unidirectionally expand the outgoing light generated by the light source assembly, and propagate the unidirectionally expanded outgoing light to at least one of the at least two reflecting surfaces.

6. The projection device according to claim 5, characterized in that: The beam expander comprises one of a cylindrical lens, a cylindrical microlens array, a one-way curved reflector, and a cylindrical grating.

7. The projection device according to claim 5, characterized in that: The beam expander comprises a rotating disk and at least two optical elements, wherein the at least two optical elements are arranged on the rotating disk, the rotating disk has a second axis, and each of the optical elements is arranged around the second axis; The rotating disk 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 outgoing light reflected by the reflective device; The optical element is used to unidirectionally expand the outgoing light passing through itself, and transmit the outgoing light after unidirectional expansion to at least one of the at least two reflection surfaces, wherein the optical parameters of each optical element are different, and the unidirectional expansion length of the outgoing light passing through each optical element is also different.

8. The projection device according to claim 7, characterized in that: The optical element is a cylindrical lens or a cylindrical grating.

9. The projection device according to claim 1 or 3, characterized in that: The light source assembly comprises at least three light emitting devices and at least two beam combining elements, wherein the wavelengths of light emitted by each of the light emitting devices are different, and the light emitted by each of the light emitting devices is combined by the at least two beam combining elements to form an output light of the light source assembly with 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, the emission directions of the at least two second light-emitting devices are perpendicular to the emission direction of the first light-emitting device, and the at least two beam-combining elements are respectively arranged at the vertical intersection of two different wavelengths of light.

10. The projection device according to claim 1 or 3, characterized in that: The projection device comprises the same number of reflective elements as the reflective surface, each of the reflective elements is fixed to the outer peripheral surface of the rotating member, and each of the reflective elements is arranged in sequence around the first axis; Wherein, the surface of the reflective element facing away from the rotating member is the reflective surface.

11. The projection device according to claim 1 or 3, characterized in that: The reflecting surface is a part of the outer circumference of the rotating member.

12. A lamp, characterized in that: include: Circuit boards; as well as The projection device according to any one of claims 1 to 11, wherein the projection device is electrically connected to the circuit board.

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