Projection device

Abstract

The application discloses a projection device, and relates to the technical field of illumination, wherein the projection device comprises a light source and a plurality of reflecting cylinders. The light source is used for emitting projection light. Each reflecting cylinder can rotate around a rotation axis distributed on the reflecting cylinder. The side surface of the reflecting cylinder is provided with a reflecting surface, and the light source is used for projecting the projection light to the reflecting surface. The plurality of reflecting cylinders are distributed in a ring shape along the circumferential direction of the distribution axis. The rotation axis of each reflecting cylinder is arranged along the circumferential direction of the distribution axis. The projection device provided by the application can project a light spot with more abundant movement modes.

Description

Technical Field

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

[0002] Projection devices are used to project light spots into the surrounding environment for decorative purposes. To achieve specific visual effects, the light spots need to move. This requires the entire projection device to move, changing the direction of the light output and thus moving the light spots. However, traditional projection devices can only perform linear motion, making the movement of the light spots rather monotonous. Summary of the Invention

[0003] The main objective of this invention is to provide a projection device that allows the projected light spot to have more movement modes.

[0004] To achieve the above objectives, the projection device proposed in this invention includes a light source and a reflector. The light source emits projection light. Multiple reflectors are present; each reflector is rotatable about a rotation axis distributed on itself; a reflective surface is formed on the side of each reflector, and the light source projects the projection light onto the reflective surface; wherein the multiple reflectors are arranged in a ring around the distribution axis; and the rotation axis of each reflector is arranged circumferentially along the distribution axis.

[0005] In some embodiments, the projection device further includes a shaping lens and a first reflector; the shaping lens is disposed radially inside the plurality of annularly distributed reflector tubes; the rotation axes of each reflector tube are coplanar with each other, the plane coplanar with the rotation axes is a reference plane, and the first reflector and the light source are respectively disposed on opposite sides of the reference plane;

[0006] The shaping lens is used to transmit the projected light from the light source; the first reflector is used to receive and reflect the projected light from the shaping lens; and the reflective surface is used to receive and reflect the projected light from the first reflector.

[0007] In some embodiments, the first reflector is pyramidal or frustum-shaped, and the top of the first reflector faces the shaping lens.

[0008] In some embodiments, the projection device further includes a drive assembly, a mounting plate, and a mirror tube connected thereto; the mirror tube is disposed in the middle of the mounting plate, and the axial direction of the mirror tube is along the normal direction of the mounting plate and passes through the mounting plate; a plurality of the reflective tubes are distributed circumferentially along the mirror tube and mounted on the mounting plate; the first reflector includes a support leg and a pyramidal or frustum-shaped body, the support leg connecting the bottom of the body and the mounting plate; the drive assembly is mounted on the mounting plate and is used to drive the reflective tubes to rotate; the shaping lens is disposed inside the mirror tube.

[0009] In some embodiments, the projection device further includes a second reflector; the second reflector is disposed on the side of the shaping lens opposite to the first reflector; the second reflector is used to receive the projection light emitted from the light source and reflect the projection light to the shaping lens.

[0010] In some embodiments, the surface of the second reflector is formed with a plurality of first beam-splitting surfaces with different surface normals.

[0011] In some embodiments, the projection device further includes a beam splitter prism; the beam splitter prism is disposed on the side of the shaping lens facing away from the first reflector; the beam splitter prism is used to receive the projection light emitted from the light source and transmit the projection light to the shaping lens; the surface of the beam splitter prism has a plurality of refractive surfaces with different surface normals.

[0012] In some embodiments, the projection device further includes a shaping lens, a first reflector, and a third reflector; the rotation axes of each of the reflecting cylinders are coplanar with each other, the plane coplanar with the rotation axes is a reference plane, the shaping lens and the first reflector are disposed on the same side of the reference plane, and the first reflector is disposed on the side of the shaping lens facing the reflecting cylinder; the third reflector is disposed radially outside the plurality of reflecting cylinders arranged in a ring.

[0013] The shaping lens is used to transmit the projected light from the light source; the first reflector is used to receive and reflect the projected light from the shaping lens; the third reflector is used to receive and reflect the projected light from the first reflector; and the reflective surface is used to receive and reflect the projected light from the third reflector.

[0014] In some embodiments, the first reflector is pyramidal or frustum-shaped, and the top of the first reflector faces the shaping lens; and / or

[0015] The surface of the third reflector has multiple second beam-splitting surfaces with different surface normals.

[0016] In some embodiments, the projection device further includes a second reflector; the second reflector is disposed on the side of the shaping lens facing away from the first reflector; the second reflector is used to receive the projection light emitted from the light source and reflect the projection light back to the shaping lens; the surface of the second reflector is formed with a plurality of first beam-splitting surfaces with different surface normals; and / or

[0017] The projection device further includes a beam splitter prism; the beam splitter prism is disposed on the side of the shaping lens facing away from the first reflector; the beam splitter prism is used to receive the projection light emitted from the light source and transmit the projection light to the shaping lens; the surface of the beam splitter prism has multiple refractive surfaces with different surface normals.

[0018] In some embodiments, the reflector is barrel-shaped with smaller cross-sectional areas at both ends and larger cross-sectional areas in the middle; and / or

[0019] The reflector tube is drum-shaped with a larger cross-sectional area at both ends and a smaller cross-sectional area in the middle; and / or

[0020] The reflective surface is rectangular, and there are multiple such reflective surfaces; the multiple reflective surfaces are arranged in a rectangular array and are adjacent to each other; and / or

[0021] There are multiple reflective surfaces; the multiple reflective surfaces are arranged in an irregular array and are spaced apart from each other.

[0022] In some embodiments, there are multiple light sources, one of which is used to project the projected light onto the reflective surface of at least one of the reflective tubes; and / or

[0023] The projection device further includes a drive assembly for driving the reflector to rotate; there are multiple drive assemblies, and each drive assembly is used to drive at least one reflector.

[0024] Multiple reflectors are arranged in a ring around the distribution axis, and the rotation axes of the reflectors are also arranged around the distribution axis. Therefore, the rotation axes of each reflector are different, which causes the reflecting surfaces on different reflectors to move in different directions as the reflector rotates. The emission direction of the reflector changes with its rotation, causing the projected light hitting the reflecting surface to be reflected in different directions. Thus, the rotation of the reflector causes the light spot reflected from the reflecting surface to move, and the different axes of the reflectors allow the light spot to move in different directions. By using multiple reflectors, the light spot can have multiple directions of movement, giving the projection device of this application more ways to project the light spot. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 A stereoscopic view structural diagram of a first embodiment of the projection device provided by the present invention;

[0027] Figure 2 A top-view structural diagram of the first embodiment of the projection device provided by the present invention;

[0028] Figure 3 The first embodiment of the projection device provided by the present invention is in Figure 2 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0029] Figure 4 A schematic diagram of the distribution of the reflector tubes in the first embodiment of the projection device provided by the present invention;

[0030] Figure 5 An exploded view of the light source in the first embodiment of the projection device provided by the present invention;

[0031] Figure 6 A top-view structural diagram of a second embodiment of the projection device provided by the present invention;

[0032] Figure 7 The second embodiment of the projection device provided by the present invention is in Figure 6 Schematic diagram of the cross-sectional structure in the DD direction;

[0033] Figure 8 A three-dimensional view diagram of the beam-splitting prism structure of the second embodiment of the projection device provided by the present invention;

[0034] Figure 9 A top-view structural diagram of a third embodiment of the projection device provided by the present invention;

[0035] Figure 10 The third embodiment of the projection device provided by the present invention is in Figure 9 Schematic diagram of the cross-sectional structure in the EE direction;

[0036] Figure 11 A stereoscopic view of the third reflector structure of the third embodiment of the projection device provided by the present invention.

[0037] Explanation of icon numbers:

[0038] Projection device 10;

[0039] Light source 11; Pattern board 111; LED beads 112;

[0040] Reflector tube 12; Reflector surface 121;

[0041] Orthopedic lens 13;

[0042] First reflector 141; main body 1411; support leg 1412; second reflector 142; first beam splitter 1421; third reflector 143; second beam splitter 1431;

[0043] Mounting plate 151; Lens barrel 152; Bracket 153;

[0044] Drive component 16; Motor 161; Gear 162;

[0045] 17-beam splitter prism; 171-refractional surface.

[0046] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0049] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of various embodiments can be combined, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0050] This invention proposes a projection device. Please refer to [reference needed]. Figure 1 The projection device 10 proposed in this invention includes a light source 11 and a reflector 12. The light source 11 is used to emit projection light. There are multiple reflectors 12; each reflector 12 is rotatable about a rotation axis distributed on itself; a reflective surface 121 is formed on the side of the reflector 12, and the light source 11 is used to project projection light onto the reflective surface 121. The multiple reflectors 12 are arranged in a ring around the distribution axis; the rotation axis of each reflector 12 is arranged around the distribution axis.

[0051] The light source 11 is a light-emitting element, which can be an LED (Light Emitting Diode), LD (Laser Diode), metal halide lamp, mercury lamp, or phosphor light source 11, etc. In some embodiments, the light source 11 can be used only to provide light, while the pattern to be projected is formed in other light paths within the projection device 10; in one example, the reflective surface 121 on the surface of the reflector 12 can be made into the shape of the desired projection (e.g., a square star, a pentagonal star, a circle, a square, or an ellipse, etc.), so that the projected light spot is in the desired shape.

[0052] Light source 11 can both provide a light beam and control the shape of the projected light spot. For an example, please refer to... Figure 5 The light source 11 includes a pattern plate 111 and a lamp bead 112, wherein the lamp bead 112 can be an LED. A light-transmitting hole is formed on the pattern plate 111. Only the part of the light emitted by the lamp bead 112 that passes through the light-transmitting hole is emitted, and the rest is blocked by the pattern plate 111. This is equivalent to forming a "light-emitting object" with the cross-sectional shape of the light-transmitting hole. In the optical path of the projection device 10, this "light-emitting object" can be imaged onto the external environment, thereby projecting a light spot of a specific shape (the same as the cross-sectional shape of the light-transmitting hole).

[0053] Depending on the function of the light source 11, the projected light will also be different. In the two examples above, in the former case, the light source 11 only provides light energy, so the projected light does not carry image information; in the latter case, the projected light will carry image information.

[0054] The reflector 12 is a component used to change the projection direction. The reflector 12 is basically cylindrical; please refer to [reference needed]. Figure 4 The reflector tube 12 can be as follows: Figure 4 The "barrel shape" shown refers to a shape with smaller cross-sectional areas at both ends of the axial direction and a larger cross-sectional area in the middle of the axial direction; the reflector tube 12 can also be "drum-shaped," that is, similar to... Figure 4 The shape is the opposite of the central state, with larger cross-sectional areas at both ends of the axial direction and smaller cross-sectional areas in the middle of the axial direction. The sidewalls of the reflector tube 12 can also be other irregular shapes, such as corrugated tubes.

[0055] The surface on the side of the reflector 12 that can reflect light is called the reflective surface 121; the reflective surface 121 needs to maintain at least part of the directional transmission characteristics of the incident light. In one example, the reflective surface 121 can produce a specular reflection effect. This can be achieved by providing a reflective film (e.g., a metal film) on the surface of the reflector 12, by providing a reflective mirror on the surface of the reflector 12, or by polishing the surface of the reflector 12 when the reflector 12 is made of a material such as metal.

[0056] The reflective surface 121 does not necessarily cover the entire side of the reflective tube 12; that is, some areas may not reflect light. Of course, the reflective surface 121 can also cover the entire side of the reflective tube 12 (e.g., Figure 4 (As shown). However, the entire reflective surface 121 of a reflector 12 cannot have an infinitesimal rotational symmetry period with the axis of the reflector 12 as the axis of rotational symmetry, because this means that if the angle at which the incident light enters the reflector 12 remains unchanged, the exit direction of the outgoing light will not change no matter how the reflector 12 rotates.

[0057] All the reflecting surfaces 121 of a reflector 12 can be rotationally symmetric about the axis (geometric axis) of the reflector 12 and have a rotational symmetry period of non-zero angle, or they can be without rotational symmetry (or the rotational symmetry period is 2π).

[0058] The axis of rotation is a virtual axis distributed along the reflector cylinder 12. It can be considered that the axis of rotation is distributed along the reflector cylinder 12 if it intersects with the solid part of the reflector cylinder 12 or passes through the surface contour of the reflector cylinder 12. Figure 3 and Figure 4 In the diagram, the axis of rotation is marked with A1. Figure 3 In the diagram, since the axis of rotation is perpendicular to the plane of the paper, it is represented by intersecting dashed lines.

[0059] In one example, the axis of rotation is parallel (alternate or coincident) to the geometric axis of the reflector 12; in another example, the axis of rotation is at an angle (intersecting or skewed) to the geometric axis of the reflector 12.

[0060] The reflective surface 121 is required to have the following characteristic: when the reflective cylinder 12 rotates about the rotation axis, the incident light rays incident on the reflective surface 121, after being reflected by the reflective surface 121, will have their exit direction changed with the rotation of the reflective cylinder 12. Therefore, in principle, the reflective surface 121 is not necessarily a plane; it can be a convex or concave surface, or even a freeform surface. However, the principle of changing the exit light direction can be explained by taking the reflective surface 121 as a plane.

[0061] exist Figure 1 In the illustrated embodiment, a reflector 12 has multiple reflective surfaces 121 arranged in an array, and each reflective surface 121 is a rectangular plane. It can be seen that when the reflector 12 rotates around its own axis, the surface normal of a reflective surface 121 also changes. At this time, the direction of the incident light remains unchanged, but the normal changes, thus changing the angle of incidence, which in turn changes the angle of reflection, thereby altering the direction of propagation of the reflected light.

[0062] It should be noted that the emission direction of the reflective surface 121 is the direction of propagation of the reflected light on the reflective surface 121. When the reflective cylinder 12 rotates around its own axis, the emission direction of the reflective surface 121 will change, which is specifically reflected in the movement of the final projected light spot.

[0063] The distribution axis is a virtual axis that defines the overall distribution of multiple reflector tubes 12. The geometric centers of all reflector tubes 12 of a projection device 10 can be connected sequentially to form a closed curve that is basically circular. The axis of this broken line can indicate the direction of extension of the distribution axis.

[0064] In one example, please refer to Figure 4 , Figure 4 The geometric centers of all the reflector cylinders 12 are connected to form a circle C (the reason it can be a planar figure is because...). Figure 4 In the diagram, the rotation axis of the reflector 12 is coplanar and passes through the geometric center of the reflector 12; however, to avoid interference with the rotation axis, the circle is drawn slightly larger than it actually is. It can be seen that the axis of this circle is the distribution axis; since this axis is perpendicular to the plane of the paper, therefore... Figure 4 The axis is represented by intersecting dashed lines and labeled A2.

[0065] In other examples, the line connecting the geometric centers of the reflector cylinders 12 can be a triangle, quadrilateral, pentagon, hexagon, circle, or ellipse, etc. Furthermore, "multiple" in this application refers to "two or more," therefore, it is specifically noted that in embodiments with only two reflector cylinders 12, the distribution axis can be directly taken as any perpendicular line from the line connecting the geometric centers of the two reflector cylinders 12 (this needs to meet the requirement below regarding the circumferential setting of the rotation axis along the distribution axis).

[0066] It should be noted that when the distribution axis can be determined using the above method, the reflector 12 will naturally be distributed in a ring shape along the circumference of the distribution axis.

[0067] The rotation axis of the reflector 12 is circumferentially arranged along the distribution axis, meaning that the length direction of the rotation axis of the reflector 12 is essentially along the circumferential direction of the distribution axis. Figure 4 In the example shown, it can be seen that circle C is a circle on the normal plane of the distribution axis A2, and the circle is symmetrical about the distribution axis; while the rotation axis A1 of each reflector 12 extends basically along the tangent direction of the circle, thus satisfying the above requirements for "rotation axis".

[0068] Please refer to Figure 4 As can be seen, when the reflector 12 rotates around its own axis, the reflector 121 can move along the circumference of the reflector 12. Naturally, the emission direction of the reflector 121 also changes along the circumference of the reflector 12. It can be seen that if the reflectors 12 are arranged in a ring, there are at least two non-coaxial reflectors 12. The emission direction of the reflector 121 on the non-coaxial reflectors 12 changes in different directions, so that the light spot can move in at least two different directions.

[0069] If the projection device 10 is moved to change the emission direction and make the light spot move, then the emitted light spot of one side of the projection device 10 can only have one direction of movement; however, if multiple reflectors 12 are arranged in a ring, the emitted light spot of one projection device 10 can have at least two different directions of movement, thereby allowing the light spot projected by the projection device 10 to have a richer range of movement.

[0070] Please refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, the projection device 10 further includes a shaping lens 13 and a first reflector 141; the shaping lens 13 is disposed on the radial inner side of a plurality of annularly distributed reflector cylinders 12; the rotation axes of each reflector cylinder 12 are coplanar with each other, the plane coplanar with the rotation axes is a reference plane, and the first reflector 141 and the light source 11 are respectively disposed on opposite sides of the reference plane.

[0071] The shaping lens 13 is used to transmit the projected light from the light source 11; the first reflector 141 is used to receive and reflect the projected light from the shaping lens 13; and the reflecting surface 121 is used to receive and reflect the projected light from the first reflector 141.

[0072] The shaping lens 13 can have different functions in different embodiments. In the embodiment described above, where the emitted light from the light source 11 does not carry image information, the shaping lens 13 can adjust the divergence angle of the light beam. In the embodiment described above, where the emitted light from the light source 11 carries image information, the shaping lens 13 can focus the image. Therefore, in some embodiments, the shaping lens 13 may not be provided, and the emitted light from the light source 11 can directly illuminate the reflector 12.

[0073] The shaping lens 13 can be a single lens or comprise multiple lenses. Figure 3 In the embodiment shown, two shaping lenses 13 are provided.

[0074] The rotation axes of each reflector 12 are coplanar, meaning there is a plane on which all rotation axes can lie simultaneously; this plane is called the reference plane. Figure 3 In the example shown, it can be seen that the rotation axis A1 of the two reflector tubes 12 defines the reference plane P.

[0075] Please refer to Figure 3 It can be seen that the shaping lens 13 is arranged radially inside the multiple reflective tubes 12 distributed in a ring (in Figure 4 In the example shown, the radial direction refers to the direction marked R in the figure (which can be considered as the radial direction of the distribution axis), and the first reflector 141 and the light source 11 are respectively set on opposite sides of the reference plane. It can be seen that this distribution makes full use of the installation space between the reflector cylinders 12, which is equivalent to allowing the light path from the light source 11 to the first reflector to pass through the center of the multiple reflector cylinders 12 that are distributed in a ring, making the structure of the projection device 10 more compact.

[0076] Please refer to Figure 1 and Figure 3 In some embodiments, the first reflector 141 is pyramidal or frustum-shaped, and the top of the first reflector 141 faces the shaping lens 13.

[0077] The first reflector 141 being pyramidal or frustum-shaped means that the reflective portion of the first reflector 141 is pyramidal or frustum-shaped, or, in other words, the main body 1411 of the first reflector 141 described below is pyramidal or frustum-shaped. Please refer to [reference needed]. Figure 1 and Figure 3 As can be seen in this embodiment, the first reflector 141 is pyramidal in shape.

[0078] The first reflector 141 is pyramidal or frustum-shaped. The side of the first reflector 141 is equivalent to having multiple reflective mirrors with different normals. According to the characteristics of mirror imaging, when the light generated by the light source 11 is projection light carrying image information, the mirrors with different normals can form multiple virtual images in different positions. This can increase the number of images and achieve the effect of one light source 11 emitting multiple light spots.

[0079] The top of the first reflector 141 faces the shaping lens 13, and the first reflector 141 is also located on one side of the reference plane. Thus, when the projected light passes through the shaping lens 13 from the other side of the reference plane and is projected onto the first reflector 141, it is reflected radially by the first reflector 141 onto each of the reflecting tubes 12. Therefore, with this light path distribution, it is not necessary to provide a separate first reflector 141 for each reflecting tube 12; a single first reflector 141 can distribute light to all reflecting tubes 12, making the projection device 10 compact.

[0080] Please refer to Figure 1 and Figure 2 In some embodiments, the projection device 10 further includes a drive assembly 16, and a mounting plate 151 and a mirror tube 152 connected thereto; the mirror tube 152 is disposed in the middle of the mounting plate 151, and the axial direction of the mirror tube 152 is along the normal direction of the mounting plate 151 and passes through the mounting plate 151; a plurality of reflective tubes 12 are distributed along the circumference of the mirror tube 152 and mounted on the mounting plate 151; the first reflector 141 includes a support leg 1412 and a pyramidal or frustum-shaped body 1411, the support leg 1412 connecting the bottom of the body 1411 and the mounting plate 151; the drive assembly 16 is mounted on the mounting plate and is used to drive the reflective tubes 12 to rotate; the shaping lens 13 is disposed inside the mirror tube 152.

[0081] Drive assembly 16 is an assembly used to drive the reflector tube 12 to rotate, and may include a power mechanism, such as a motor 161; it may also include a transmission mechanism, such as a belt, rack, etc. Figure 2 In the embodiment shown, the drive mechanism includes a motor 161 and a gear 162, with the motor 161 as the power source and the gear 162 for transmission.

[0082] The main body 1411 of the reflector is the part used for reflection, while the support leg 1412 is the part used for support; therefore, the support leg 1412 may not have a reflective effect. However, it should be noted that the support leg 1412 is not necessarily an independent leg; in… Figure 2 In the embodiment shown, the support leg 1412 is partially arranged around the main body 1411, and the foot-shaped part begins to extend out radially outward from the main body 1411.

[0083] In the above embodiments, the mounting plate 151 and the lens barrel 152 can be integrally set. It can be seen that the drive mechanism, the first reflector 141, the shaping lens 13, and the reflector 12 are all integrated into the whole formed by the mounting plate 151 and the lens barrel 152. The integration is high, making the projection device 10 more compact in structure.

[0084] The assembly formed by the mounting plate 151 and the lens barrel 152 can serve as the main supporting element of the projection device 10, because the lens barrel 152 can reinforce the mounting plate 151, increasing the moment of inertia of the mounting plate 151 on the cross-section passing through the axis of the lens barrel 152, thus giving the assembly high strength. Please refer to... Figure 3 In some embodiments, a bracket 153 can be added to connect the two, and the light source 11 (as well as the second reflector 142 and beam splitter 17, etc., described below) can be fixed on the bracket 153, so that the main components of the projection device 10 can be integrated onto a mounting plate 151, making the projection device 10 compact and strong overall.

[0085] Please refer to Figure 1 and Figure 3 In some embodiments, the projection device 10 further includes a second reflector 142; the second reflector 142 is disposed on the side of the shaping lens 13 facing away from the first reflector 141; the second reflector 142 is used to receive the projection light emitted from the light source 11 and reflect the projection light to the shaping lens 13.

[0086] In embodiments where the second reflector 142 is installed in the light source 11 to generate projection light loaded with pattern information, the light source 11 can be mirrored (imaged by a plane mirror or a curved mirror). This can fold the light path from the light source 11 to the shaping lens 13, making the projection device 10 smaller in the direction of the optical axis of the shaping lens 13. On the other hand, it can share the shaping pressure of the shaping lens 13 (when the surface of the second reflector 142 is at least partially curved and has a certain shaping capability), thus reducing the generation of aberrations.

[0087] In embodiments where the light source 11 only provides illumination, the second reflector 142 can control the divergence of the emitted light from the light source 11. Even if it is just a plane mirror, the second reflector 142 can extend the light path within a limited space by folding the light path, thus increasing the illumination area of ​​the emitted light from the light source 11. In some embodiments, the surface of the second reflector 142 can be at least partially curved, which can directly change the divergence angle of the emitted light from the light source 11.

[0088] It should be noted that the setting of the second reflector 142 gives special meaning to "the light source 11 is set on one side of the reference plane". In the embodiment where the second reflector 142 is set, this feature should be understood as "the virtual image formed by the light source 11 through the second reflector 142 is on one side of the reference plane". The light source 11 may also be on one side of the reference plane, or on the radial side of the distribution axis, etc.

[0089] Please refer to Figure 1 In some embodiments, the surface of the second reflector 142 is formed with a plurality of first beam-splitting surfaces 1421 with different surface normals.

[0090] In this way, the second reflector 142 has multiple reflective mirrors with different normals (i.e., the first beam splitter 1421). According to the characteristics of mirror imaging, when the light generated by the light source 11 is the projection light carrying image information, the mirrors with different normals can form multiple virtual images at different positions, thus increasing the number of images and achieving the effect of one light source 11 emitting multiple light spots.

[0091] In particular, in some embodiments, the first beam-splitting surface 1421 of the second reflector 142 can be matched with the first reflector 141 which is pyramidal or frustum-shaped, so that the number of images increases exponentially.

[0092] Furthermore, in some embodiments, the first beam-splitting surface 1421 of the second reflector 142, the pyramidal or frustum-shaped first reflector 141, and the reflective cylinder 12 with arrayed reflective surfaces 121 on its sides cooperate with each other, such as... Figure 1 This is the case in the embodiment shown; at this time, after the number of images is increased by the second reflector 142 and the first reflector 141, it will be further increased by the beam-splitting surface of the reflector 12. The number of images should be the product of the number of surfaces of the first beam-splitting surface 1421, the number of surfaces of the side of the first reflector 141 (the side of the first reflector 141 is triangular or trapezoidal), and the number of surfaces of the reflector 121 illuminated by the projection light of the light source 11.

[0093] As can be seen in the above embodiment, the number of emitted light spots is very large. If placed indoors for projection, it can create a star projection effect. Furthermore, if multiple reflector tubes 12 are arranged in a ring shape, and the axes of each reflector tube 12 are along the tangent of the distribution, that is... Figure 4 As shown in the diagram, when multiple reflectors 12 rotate simultaneously, the stars (i.e., the projected light spots) can move inwards or outwards, creating a visual effect of "spinning around." Clearly, in achieving this "spinning around" effect, the light spots simultaneously exhibit multiple directions of motion, which is precisely the technical effect achievable by the multiple reflectors 12 solution provided in this application.

[0094] Please refer to Figure 6 , Figure 7 and Figure 8 In some embodiments, the projection device 10 further includes a beam splitter 17; the beam splitter 17 is disposed on the side of the shaping lens 13 facing away from the first reflector 141; the beam splitter 17 is used to receive the projection light emitted from the light source 11 and transmit the projection light to the shaping lens 13; the surface of the beam splitter 17 is formed with a plurality of refractive surfaces 171 with different surface normals.

[0095] The beam splitter 17 has multiple refractive surfaces 171 formed on its surface. Since the normals of the surfaces of each refractive surface 171 are different, even if the propagation direction of light incident on the beam splitter 17 is basically the same, after being refracted by different refractive surfaces 171, the propagation direction of light passing through different refractive surfaces 171 is also dispersed, thus achieving the effect of beam splitting.

[0096] The refractive surface 171 also has a similar effect to a mirror in forming a virtual image. Therefore, in the embodiment where the projected light emitted by the light source 11 carries image information, the beam splitter 17 can also increase the number of virtual images.

[0097] The beam splitter 17 can be coaxially arranged with the shaping lens 13. Therefore, in this embodiment, the light source 11, the beam splitter 17 and the shaping lens 13 can be coaxially arranged, which facilitates installation and debugging and makes the assembly of the projection device 10 simpler.

[0098] Please refer to Figure 9 and Figure 10 In some embodiments, the projection device 10 further includes a shaping lens 13, a first reflector 141, and a third reflector 143; the rotation axes of each reflecting cylinder 12 are coplanar, and the plane shared by the rotation axes is a reference plane. The shaping lens 13 and the first reflector 141 are disposed on the same side of the reference plane, and the first reflector 141 is disposed on the side of the shaping lens 13 facing the reflecting cylinder 12; the third reflector 143 is disposed radially outside the plurality of annularly distributed reflecting cylinders 12. The shaping lens 13 is used to transmit projection light from the light source 11; the first reflector 141 is used to receive and reflect projection light from the shaping lens 13; the third reflector 143 is used to receive and reflect projection light from the first reflector 141; and the reflecting surface 121 is used to receive and reflect projection light from the third reflector 143.

[0099] The specific structure and function of the shaping lens 13 and the first reflector 141 can be referred to the above-described embodiments. The arrangement of the third reflector 143 allows the shaping lens 13 and the first reflector 141 to be arranged on the same side of the reference plane (rather than on opposite sides as in the above-described embodiments), and naturally, the light source 11 can also be arranged on this side.

[0100] For details, please refer to Figure 10 The light emitted from light source 11 can enter the shaping lens 13 ( Figure 10 In this embodiment, the projection light from the light source 11 is reflected by the second reflector 142 so that it enters the shaping lens 13. In other embodiments, the projection light can directly enter the shaping lens 13. After passing through the shaping lens 13, the projection light is reflected by the first reflector 141 and then directed to the third reflector 143. The third reflector 143 reflects the projection light and directs it to the reflector cylinder 12.

[0101] Since the third reflector 143 is disposed radially outside the plurality of reflector tubes 12 arranged in a ring, the projected light can also illuminate the side of the reflector tube 12 located radially outside the distribution of the plurality of reflector tubes 12, which can increase the light-receiving area of ​​the reflector tube 12; for the embodiment in which the reflector surface 121 is arranged in an array, the increase in the light-receiving area of ​​the reflector tube 12 can increase the number of light spots and the projection range; for other embodiments, at least the projection range can be increased.

[0102] Please refer to Figure 10 In some embodiments, the first reflector 141 is pyramidal or frustum-shaped, with its top facing the shaping lens 13. For embodiments where the projected light generated by the light source 11 carries image information, the first reflector 141 can increase the number of images, thereby increasing the number of light spots. Simultaneously, a single first reflector 141 can radially disperse the projected light into multiple reflecting tubes 12, allowing different reflecting tubes to receive it, eliminating the need for separate first reflectors 141 for each reflecting tube 12, thus making the projection device 10 more compact.

[0103] Please refer to Figure 10 and Figure 11 In some embodiments, the surface of the third reflector 143 is formed with a plurality of second beam-splitting surfaces 1431 with different surface normals. For embodiments in which the projected light generated by the light source 11 carries image information, the plurality of second beam-splitting surfaces 1431 of a third reflector 143 can increase the number of images, thereby increasing the number of light spots; the third reflector 143 with a plurality of second beam-splitting surfaces 1431 can also be combined with a first reflector 141 that is pyramidal or frustum-shaped, so that the number of images is increased exponentially.

[0104] Please refer to Figure 10 In some embodiments, the projection device 10 further includes a second reflector 142; the second reflector 142 is disposed on the side of the shaping lens 13 facing away from the first reflector 141; the second reflector 142 is used to receive the projection light emitted from the light source 11 and reflect the projection light to the shaping lens 13; the surface of the second reflector 142 is formed with a plurality of first beam-splitting surfaces 1421 with different surface normals (for the structure of the first beam-splitting surface 1421, please refer to...). Figure 1 ).

[0105] and Figures 1 to 3 The second reflector 142 in the illustrated embodiment is similar (see also the above). In this type of embodiment, the plurality of first beam-splitting surfaces 1421 of the second reflector 142 can also increase the number of images. In particular, the first reflector 141, the second beam splitter, and the third beam splitter can be arranged in combination (i.e., Figure 10 The implementation shown allows the number of images to increase threefold, resulting in a larger projection area while maintaining a high spot density.

[0106] Please refer to Figure 10 In some embodiments, the projection device 10 further includes a beam splitter 17 (not shown in the figure, but its specific structure can be found in reference). Figure 8 The beam splitter 17 is positioned on the side of the shaping lens 13 facing away from the first reflector 141. The beam splitter 17 receives the projection light emitted from the light source 11 and transmits the projection light to the shaping lens 13. The surface of the beam splitter 17 has multiple refractive surfaces 171 with different surface normals. In this way, the light source 11, beam splitter 17, shaping lens 13, and first reflector 141 can all be coaxially arranged, which facilitates the debugging and installation of the projection device 10.

[0107] Please refer to Figure 4 In some embodiments, the reflector 12 is barrel-shaped with smaller cross-sectional areas at both ends of the axial direction and larger cross-sectional area in the middle of the axial direction.

[0108] The barrel-shaped shape causes the light emitted from each reflector 121 to diverge and separate from each other after being reflected by the reflector 12, so that the emitted light can be dispersed more widely over a shorter propagation distance, which makes it easier to increase the projection range of the projection device 10.

[0109] In some embodiments, the reflector 12 is in the shape of a drum with a larger cross-sectional area at both ends of the axis and a smaller cross-sectional area in the middle of the axis.

[0110] The drum-shaped design makes the reflector tube 12 smaller, which helps to make the projection device 10 more compact.

[0111] Please refer to Figure 4 In some embodiments, the reflective surface 121 is rectangular and there are multiple reflective surfaces; the multiple reflective surfaces are distributed in a rectangular array and arranged adjacent to each other.

[0112] In this way, the reflective surfaces 121 can be arranged as closely as possible, increasing the number of reflective surfaces 121 and thus increasing the number of emitted light spots.

[0113] In some embodiments, there are multiple reflective surfaces 121; the multiple reflective surfaces 121 are arranged in an irregular array and are spaced apart from each other.

[0114] Since the relative positions of the emitted light spots are related to the relative positions of the reflecting surfaces 121, when the reflecting surfaces 121 are arranged in an irregular array, the relative positions of the light spots are also irregular, which can form randomly distributed light spots and help to form richer light spot patterns.

[0115] In some embodiments, there are multiple light sources 11, with one light source 11 used to project projection light onto the reflective surface 121 of at least one reflector 12. It should be noted that a light source 11 can be a monochromatic light source or a color-adjustable light source. However, if the projection light from a light source 11 is projected onto all reflectors 12, the emitted light spot will be the same color. When there are at least two (i.e., multiple) light sources 11, even if the light sources 11 are monochromatic, they can be set to different colors. And when the color of the light source 11 is adjustable, different light sources 11 can also have different colors of emitted light, thereby achieving multi-color projection.

[0116] In some embodiments, the projection device 10 further includes a drive assembly 16 for driving the reflector cylinder 12 to rotate; there are multiple drive assemblies 16, and each drive assembly 16 is used to drive at least one reflector cylinder 12. In this way, at least some of the reflector cylinders 12 can have a non-interlocking drive configuration, or in other words, at least one pair of reflector cylinders 12 can have a rotation direction that does not affect the rotation direction of the other. This can improve the flexibility of adjusting the direction of light spot movement.

[0117] Of course, in some implementations, all reflector tubes 12 can be interconnected, meaning that if the rotation direction of one reflector tube 12 is determined, the rotation direction of the remaining reflector tubes 12 is also determined. This results in a simple structure, low cost, and stable operation for the drive assembly 16.

[0118] Furthermore, it should be noted that the reflective surface 121 of the reflector 12, the reflective surface of the first reflector 141, the first beam-splitting surface 1421 of the second reflector 142, and the second beam-splitting surface 1431 of the third reflector 143 can all be achieved by electroplating, vacuum plating, or by attaching a plane mirror.

[0119] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A projection device, characterized in that, include: Light source, used to emit projection light; Multiple reflectors, each of which is rotatable about a rotation axis distributed on itself; a reflective surface is formed on the side of each reflector, and the light source is used to project the projected light onto the reflective surface; The plurality of reflective tubes are arranged in a ring around the distribution axis; the rotation axis of each reflective tube is arranged around the distribution axis.

2. The projection device as described in claim 1, characterized in that, The projection device further includes a shaping lens and a first reflector; the shaping lens is disposed on the radial inner side of the plurality of annularly distributed reflector cylinders; the rotation axes of each reflector cylinder are coplanar with each other, the plane coplanar with the rotation axes is a reference plane, and the first reflector and the light source are respectively disposed on opposite sides of the reference plane; The shaping lens is used to transmit the projected light from the light source; the first reflector is used to receive and reflect the projected light from the shaping lens; and the reflective surface is used to receive and reflect the projected light from the first reflector.

3. The projection device as described in claim 2, characterized in that, The first reflector is pyramidal or frustum-shaped, and the top of the first reflector faces the shaping lens.

4. The projection device as described in claim 3, characterized in that, The projection device further includes a driving assembly, a mounting plate, and a mirror tube connected thereto; the mirror tube is disposed in the middle of the mounting plate, and the axial direction of the mirror tube is along the normal direction of the mounting plate and passes through the mounting plate; a plurality of the reflecting tubes are distributed circumferentially along the mirror tube and mounted on the mounting plate; the first reflector includes a support leg and a pyramidal or frustum-shaped body, the support leg connecting the bottom of the body and the mounting plate; the driving assembly is mounted on the mounting plate and is used to drive the reflecting tubes to rotate; the shaping lens is disposed inside the mirror tube.

5. The projection device as described in claim 2, characterized in that, The projection device further includes a second reflector; the second reflector is disposed on the side of the shaping lens opposite to the first reflector; the second reflector is used to receive the projection light emitted from the light source and reflect the projection light to the shaping lens.

6. The projection device as described in claim 5, characterized in that, The surface of the second reflector has multiple first beam-splitting surfaces with different surface normals.

7. The projection device as claimed in claim 2, characterized in that, The projection device further includes a beam splitter prism; the beam splitter prism is disposed on the side of the shaping lens facing away from the first reflector; the beam splitter prism is used to receive the projection light emitted from the light source and transmit the projection light to the shaping lens; the surface of the beam splitter prism has multiple refractive surfaces with different surface normals.

8. The projection device as claimed in claim 1, characterized in that, The projection device further includes a shaping lens, a first reflector, and a third reflector; the rotation axes of each of the reflector cylinders are coplanar with each other, and the plane coplanar with the rotation axes is a reference plane. The shaping lens and the first reflector are disposed on the same side of the reference plane, and the first reflector is disposed on the side of the shaping lens facing the reflector cylinder; the third reflector is disposed on the radially outer side of the plurality of reflector cylinders arranged in a ring. The shaping lens is used to transmit the projected light from the light source; the first reflector is used to receive and reflect the projected light from the shaping lens; the third reflector is used to receive and reflect the projected light from the first reflector; and the reflective surface is used to receive and reflect the projected light from the third reflector.

9. The projection device as claimed in claim 8, characterized in that, The first reflector is pyramidal or frustum-shaped, and the top of the first reflector faces the shaping lens; and / or The surface of the third reflector has multiple second beam-splitting surfaces with different surface normals.

10. The projection device as claimed in claim 8, characterized in that, The projection device further includes a second reflector; the second reflector is disposed on the side of the shaping lens facing away from the first reflector; the second reflector is used to receive the projection light emitted from the light source and reflect the projection light to the shaping lens; the surface of the second reflector has a plurality of first beam-splitting surfaces with different surface normals. and / or The projection device further includes a beam splitter prism; the beam splitter prism is disposed on the side of the shaping lens facing away from the first reflector; the beam splitter prism is used to receive the projection light emitted from the light source and transmit the projection light to the shaping lens; the surface of the beam splitter prism has multiple refractive surfaces with different surface normals.

11. The projection device as claimed in claim 1, characterized in that, The reflector tube is barrel-shaped with smaller cross-sectional areas at both ends and larger cross-sectional areas in the middle; and / or The reflector tube is drum-shaped with a larger cross-sectional area at both ends and a smaller cross-sectional area in the middle; and / or The reflective surface is rectangular, and there are multiple such reflective surfaces; the multiple reflective surfaces are arranged in a rectangular array and are adjacent to each other; and / or There are multiple reflective surfaces; the multiple reflective surfaces are arranged in an irregular array and are spaced apart from each other.

12. The projection device as claimed in claim 1, characterized in that, The light source has multiple sources, one of which is used to project the projected light onto the reflective surface of at least one of the reflective cylinders; and / or The projection device further includes a drive assembly for driving the reflector to rotate; there are multiple drive assemblies, and each drive assembly is used to drive at least one reflector.

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