Projection imaging device and luminaire

Abstract

The application discloses a projection imaging device and a lamp. The projection imaging device comprises a first light source, a rotating mechanism and a diffraction grating. The first light source is used for generating outgoing light. The rotating mechanism is arranged at intervals from the first light source. The diffraction grating is arranged on the rotating mechanism and can rotate around a predetermined axis to the light path of the outgoing light under the driving of the rotating mechanism, so that the outgoing light can be emitted through the diffraction grating. The predetermined axis is not parallel to the light path of the outgoing light. When the diffraction grating rotates around the predetermined axis under the driving of the rotating mechanism, the incident angle of the outgoing light on the diffraction grating changes. Since the relative angle between the diffraction grating and the outgoing light changes when the diffraction grating rotates under the driving of the rotating mechanism, the outgoing light is swept on the diffraction grating, so that the light spot formed through the diffraction grating presents linear motion on the imaging surface, which enriches the viewing experience of the user.

Description

Technical Field

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

[0002] Existing starry sky lights often use a laser to illuminate a rotatable grating plate when projecting starry sky images, thus creating a projected image of a rotating starry sky. Alternatively, based on the above technology, another grating plate is fixed at the laser emission port, and by illuminating both grating plates, the overall starry sky appears to rotate, with some star points (i.e., light spots) achieving an irregular rotation effect.

[0003] Since the above technical solutions all use rotatable grating sheets, they can only realize the rotation of the light spot and cannot realize other dynamics of the light spot, resulting in a relatively simple imaging effect. Summary of the Invention

[0004] This application provides a projection imaging device and a lamp.

[0005] According to a first aspect of this application, an embodiment of this application provides a projection imaging device, which includes a first light source, a rotating mechanism, and a diffraction grating. The first light source is used to generate emitted light. The rotating mechanism is spaced apart from the first light source. The diffraction grating is disposed on the rotating mechanism and can rotate around a predetermined axis under the drive of the rotating mechanism to the optical path where the emitted light is located, so that the emitted light can be emitted through the diffraction grating. The predetermined axis is not parallel to the optical path of the emitted light, and when the diffraction grating rotates around the predetermined axis under the drive of the rotating mechanism, the incident angle of the emitted light on the diffraction grating changes.

[0006] According to a second aspect of this application, an embodiment of this application provides a lighting fixture, including a circuit board and a projection imaging device as described above. The projection imaging device is electrically connected to the circuit board.

[0007] This application provides a projection imaging device and a lamp. In this projection imaging device, emitted light generated by a first light source is projected onto a diffraction grating, causing the light emitted through the diffraction grating to carry multiple diffraction spots. This results in an image containing multiple star points (i.e., diffraction spots) when projected onto a projection surface. Furthermore, the projection imaging device includes a rotating mechanism connected to the diffraction grating. Driven by the rotating mechanism, the diffraction grating rotates, causing the emitted light to sweep across the grating. This changes the incident angle of the emitted light on the grating and the exit angle after passing through it. Consequently, during the rotation of the grating, the diffraction spots corresponding to the emitted light move linearly on the projection surface, creating a linear motion effect similar to the movement of meteors, thus enriching the user's viewing experience.

[0008] In practical applications, the number of the aforementioned components is unlimited. When multiple diffraction gratings, corresponding rotating mechanisms, and first light sources are provided, the emitted light exits through multiple diffraction gratings and forms multiple light spots or star patterns on the projection surface. The linear movement of these multiple light spots or star patterns is related to the arrangement of the rotating mechanisms. For example, when multiple rotating mechanisms are arranged in a circle, the linear movement of the multiple light spots or star patterns can appear as a divergence from the center outwards or a contraction from the periphery towards the center. Similarly, when multiple rotating mechanisms are arranged in an array, the linear movement of the multiple light spots or star patterns can appear as an array movement, similar to the effect of a meteor shower. Therefore, the projection imaging device and lamp provided in this application embodiment can achieve various imaging effects, enriching the user's viewing experience. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the projection imaging device provided in the embodiments of this application.

[0011] Figure 2 This is another schematic diagram of the projection imaging device provided in the embodiments of this application.

[0012] Figure 3 yes Figure 1 A schematic diagram of the assembly of the rotating mechanism and diffraction grating of the projection imaging device.

[0013] Figure 4 yes Figure 3 A three-dimensional exploded view of the rotating mechanism and the diffraction grating.

[0014] Figure 5 yes Figure 1 A schematic diagram of the rotating mechanism, diffraction grating, and first light source of the projection imaging device in the assembled state.

[0015] Figure 6 This is another structural schematic diagram of the projection imaging device provided in the embodiments of this application.

[0016] Figure 7 This is a schematic diagram of a modified structure of the rotation mechanism and drive mechanism of the projection imaging device provided in the embodiments of this application.

[0017] Figure 8 yes Figure 5 A simplified schematic diagram of a projection imaging device.

[0018] Figure 9 This is another structural schematic diagram of the rotation mechanism and translation mechanism of the projection imaging device provided in the embodiments of this application.

[0019] Figure 10 yes Figure 9 A three-dimensional exploded view of the rotation and translation mechanisms of the projection imaging device.

[0020] Figure 11 yes Figure 10 A partial structural diagram of the rotating mechanism and the translation mechanism.

[0021] Figure 12 yes Figure 11 A schematic diagram of the orthographic projection of some structures of the rotating mechanism and the translation mechanism.

[0022] Figure 13 yes Figure 10 A schematic diagram of the orthographic projection of the rotating mechanism and the translation mechanism in their decomposed state.

[0023] Figure 14 yes Figure 9 Another three-dimensional exploded view of the rotating and translating mechanisms of the projection imaging device.

[0024] Figure 15 This is a schematic diagram of the structure of the lamp provided in the embodiment of this application. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0026] Please see Figure 1 and Figure 2 This application provides a projection imaging device 100. The projection imaging device 100 can be applied to a projection lamp, which is a lamp used to project a specified pattern onto an imaging surface or projection surface (e.g., a reflective surface such as the ground, wall, or ceiling). Depending on the specified pattern, the projection lamp may include a logo projection lamp, an advertising projection lamp, a starry sky projection lamp, etc.

[0027] In this embodiment, the projection imaging device 100 includes a first light source 10, a rotating mechanism 30, and a diffraction grating 40. The first light source 10 generates outgoing light. The rotating mechanism 30 is spaced apart from the first light source 10. The diffraction grating 40 is disposed on the rotating mechanism 30 and can rotate around a predetermined axis under the drive of the rotating mechanism to the optical path of the outgoing light, so that the outgoing light can exit through the diffraction grating 40. Therefore, the light emitted through the diffraction grating 40 carries multiple diffraction spots, thereby forming an image containing multiple star points (i.e., diffraction spots) during imaging. The diffraction grating 40 is connected to the rotating mechanism 30, and the diffraction grating 40 rotates under the drive of the rotating mechanism 30, causing the outgoing light to scan across the diffraction grating 40. The incident angle of the outgoing light on the diffraction grating 40 changes, and the exit angle of the outgoing light after passing through the diffraction grating 40 also changes. Therefore, during the rotation of the diffraction grating 40, the diffraction spot corresponding to the outgoing light will also move linearly on the projection surface, thereby causing multiple diffraction spots to move linearly on the imaging surface, creating an effect similar to the movement of a meteor shower, enriching the user's viewing experience.

[0028] Furthermore, in this embodiment, the predetermined axis is not parallel to the optical path of the emitted light. This allows the first light source 10 to be offset from the predetermined axis, i.e., from the rotation axis of the diffraction grating 40, thereby saving installation space on the predetermined axis. Simultaneously, when the diffraction grating 40 moves around the predetermined axis, it is not necessary to set up additional deceleration or transmission mechanisms to avoid the first light source 10. Instead, by utilizing the characteristic that the predetermined axis is not parallel to the optical path of the emitted light, the driving and transmission mechanisms of the diffraction grating 40 and the position of the first light source 10 can be rationally arranged, which helps to make the structure of the projection imaging device 100 more compact and stable.

[0029] The diffraction grating 40 provided in this application embodiment is an optical element that uses a regular structure to periodically spatially modulate the amplitude and / or phase of light. Depending on the shape of the light spot formed by light passing through the diffraction grating 40, the diffraction grating 40 may include at least one structure selected from the following: a cross-shaped diffraction grating, a matrix diffraction grating, a fan-shaped diffraction grating, a starry sky diffraction grating, etc.

[0030] Please see Figure 2 In some embodiments, the projection imaging device 100 further includes a housing 50, the interior of which is provided with a receiving space 52 for accommodating the first light source 10, the rotating mechanism 30, and the diffraction grating 40, thereby providing protection and storage for these components or parts. In some embodiments, the housing 50 is provided with a light exit port 521, which connects the receiving space 52 to the outside, for allowing emitted light to be emitted from inside the housing 50 to the outside. That is, the light exit port 521 is located in the optical path of the light emitted through the diffraction grating 40, and the light emitted through the diffraction grating 40 can be projected onto the imaging surface (e.g., a wall) through the light exit port 521 on the housing 50.

[0031] Furthermore, in this embodiment, to make the projection imaging device 100 more robust, it may also include a substrate 60. The substrate 60 is fixedly disposed within the housing 50 and spaced apart from the light outlet 521. The first light source 10 and the rotating mechanism 30 are both mounted on the substrate 60. Specifically, the substrate 60 is generally flat and includes a first mounting surface 62 and a second mounting surface 64 that are opposite to each other. The first mounting surface 62 faces the light outlet 521, and the second mounting surface 64 faces the bottom wall of the housing 50. The first light source 10 and the rotating mechanism 30 are both mounted on the first mounting surface 62.

[0032] In this embodiment, the first light source 10 is fixed inside the housing 50, for example, it can be fixed to the first mounting surface 62 of the substrate 60 by means of threaded fasteners. The first light source 10 can be a laser generator, that is, the emitted light is laser light. Specifically, the first light source 10 can be a single-wavelength laser generator, for example, the first light source 10 is a green laser generator with a wavelength of 532nm. The first light source 10 can also be a tunable broadband laser generator, which can generate and emit laser light of a specified wavelength. Further, in this embodiment, the direction of the light path of the emitted light emitted by the first light source 10 is from the substrate 60 to the light outlet 521, and the light path of the emitted light can be approximately perpendicular to the substrate 60.

[0033] The rotating mechanism 30 is mounted on the substrate 60 and spaced apart from the first light source 10. The rotating mechanism 30 drives the diffraction grating 40 to rotate around a predetermined axis O to form a linearly moving light effect. The rotating mechanism 30 may include a connecting seat 36 and a rotating member 32. The connecting seat 36 is fixedly disposed on the substrate 60, and the rotating member 32 is rotatably disposed on the connecting seat 36. The diffraction grating 40 is disposed on the rotating member 32. When the rotating member 32 rotates relative to the connecting seat 36, the diffraction grating 40 rotates around the predetermined axis O, and the axis of rotation of the rotating member 32 is the predetermined axis O.

[0034] Please see Figure 3 and Figure 4 As an example, the connector 36 may include a connecting portion 361, a mounting portion 363, and a transition portion 365. The connecting portion 361 is connected to the first mounting surface 62 of the substrate 60 by fasteners such as screws. The mounting portion 363 is connected to the connecting portion 361 and protrudes and bends relative to the connecting portion 361. Specifically, the mounting portion 363 may be generally plate-shaped and generally perpendicular to the substrate 60. The transition portion 365 is disposed at the end of the mounting portion 363 away from the connecting portion 361 and protrudes relative to the mounting portion 363. The transition portion 365 is located on the side of the mounting portion 363 facing the first light source 10. The transition portion 365, the mounting portion 363, and the connecting portion 361 may be an integrally formed structure or an assembled connection structure. The transition portion 365 is used to mount the rotating member 32. Specifically, the adapter 365 can be generally shaft-shaped, and the rotation center of the rotating member 32 can be provided with a receiving hole 321. The rotating member 32 is rotatably sleeved outside the adapter 365 through the receiving hole 321. Therefore, when the rotating member 32 is driven to rotate, the relative rotation between the rotating member 32 and the connecting seat 36 is achieved based on the hole-shaft fit structure between the receiving hole 321 and the adapter 365. In the embodiments of this application, the specific implementation of the rotating mechanism 30 driving the rotating member 32 should not be limited.

[0035] As an example, the rotating mechanism 30 can have its own drive source, enabling it to rotate independently. Specifically, the rotating mechanism 30 may also include a rotating drive component (not shown in the figure). The rotating drive component is disposed on the first mounting surface 62 of the substrate 60, or it may be disposed on the connecting seat 36. The axis of the drive shaft of the rotating drive component is a predetermined axis O, which is approximately perpendicular to the light path of the emitted light or approximately parallel to the substrate 60. The rotating drive component can be a rotary motor, a rotary motor with a built-in gearbox, or a rotary servo motor or other rotating drive device. The rotating component 32 may have a generally disc or turntable structure, which is connected to the output end of the rotating drive component and disposed adjacent to the first light source 10. The surface of the rotating component 32 facing away from the connecting seat 36 (which can be considered as the end face) is used to mount the diffraction grating 40. When the rotating component 32 rotates under the drive of the rotating drive component, the rotating component 32 drives the diffraction grating 40 to rotate, causing the incident angle of the emitted light on the diffraction grating 40 to change with the rotational movement.

[0036] As another example, please refer to [link / reference]. Figure 2 The rotating mechanism 30 can be driven by a dedicated drive mechanism 70, and the rotating mechanism 30 serves as the actuator for rotation. Specifically, in this embodiment, the projection imaging device 100 may further include a drive mechanism 70 mounted on the substrate 60. The drive mechanism 70 includes a rotating drive source 72 and a transmission component 74. The rotating drive source 72 is mounted on the substrate 60, for example, it can be mounted on the side of the substrate 60 opposite to the light outlet 521, that is, mounted on the second mounting surface 64 of the substrate 60, so that it is located on opposite sides of the substrate 60 with the rotating mechanism 30 or the first light source 10, which is beneficial to improving the space utilization of the projection imaging device 100 and making the structure of the projection imaging device 100 more compact. The rotating drive source 72 can be a rotary motor, or a rotary motor with a built-in gearbox, or a rotary servo motor or other rotary drive device.

[0037] In this embodiment, the rotating member 32 is rotatably disposed on the first mounting surface 62 of the substrate 60 and connected to the driving end of the rotary drive source 72 via the transmission member 74, so that it rotates around a predetermined axis O under the drive of the rotary drive source 72. At this time, the rotation axis of the rotating member 32 is the predetermined axis O, which is approximately perpendicular to the light path of the emitted light or approximately parallel to the substrate 60. Specifically, the transmission member 74 is movably disposed through the substrate 60 and is connected to the rotating member 32 in a transmission manner. In this embodiment, the rotating member 32 is a gear, and the transmission member 74 is a worm gear. The gear meshes with the worm gear, and the diffraction grating 40 is disposed on the end face of the gear facing the first light source 10. Specifically, the substrate 60 may have a through hole that penetrates the first mounting surface 62 and the second mounting surface 64. One end of the worm gear is connected to the rotary drive source 72, and the worm gear is movably disposed through the through hole to mesh with the gear. In this embodiment, the gear can be a cylindrical gear structure, such as a helical cylindrical gear or an arc-shaped cylindrical gear, so as to mesh with the worm and reduce transmission noise.

[0038] In this embodiment, the rotation axis of the rotating member 32 is the predetermined axis O. The predetermined axis O can be spaced apart from the substrate 60 so that the diffraction grating 40 mounted on the rotating member 32 can receive the emitted light. Furthermore, the predetermined axis O can be approximately perpendicular to the optical path of the emitted light or perpendicular to it from opposite planes, so that when the diffraction grating 40 is disposed on the end face of the rotating member 32, the diffraction efficiency of the emitted light is high. Furthermore, the diffraction grating 40 can be located on the side of the rotating member 32 away from the connecting seat 36, and it can be approximately perpendicular to the end face of the rotating member 32.

[0039] The plane containing the diffraction grating 40 can be parallel to or coincide with the predetermined axis O.

[0040] As an example, when the plane containing the diffraction grating 40 is parallel to the predetermined axis O, the plane containing the diffraction grating 40 will not pass through the predetermined axis O. This allows the diffraction grating 40 to rotate into the area covered by the emitted light during its rotation around the predetermined axis O, thereby receiving the emitted light from the first light source 10. In this example, since the orientation of the diffraction grating 40 does not coincide with the radial direction of the rotating member 32, the position requirement of the first light source 10 can be slightly relaxed. For example, the first light source 10 can be offset from the predetermined axis O, so that the coverage area of ​​the emitted light does not cover the predetermined axis O as much as possible. That is, there is a certain distance between the boundary of the coverage area of ​​the emitted light and the predetermined axis O, so that the emitted light will not illuminate the predetermined axis O. In this way, when the diffraction grating 40 rotates above the first light source 10, the angle between the first light source 10 and the optical path of the emitted light is as large as possible, which can increase the effective incident time of the emitted light on the diffraction grating 40, thereby expanding the area corresponding to the diffraction spot. This improves the diffraction range and efficiency. For example, the position of the first light source 10 can be roughly aligned with the predetermined axis O, that is, the light-emitting surface of the first light source 10 faces the predetermined axis O. At this time, since the plane where the diffraction grating 40 is located does not coincide with the radial direction of the rotating component 32, when the diffraction grating 40 moves above the first light source 10, there is still a certain angle between the first light source 10 and the light path of the emitted light (not an angle of 0 degrees). The emitted light can penetrate the diffraction grating 40 to form a diffraction spot. In this case, the requirements for the assembly accuracy, position accuracy, and dimensional accuracy of the first light source 10 or the diffraction grating 40 are relatively low, which is conducive to improving the efficiency of production assembly.

[0041] As another example, when the plane containing the diffraction grating 40 coincides with the predetermined axis O, the plane containing the diffraction grating 40 passes through the predetermined axis O, and the diffraction grating 40 is arranged approximately along the radial direction of the rotating member 32. In this example, the first light source 10 is offset from the predetermined axis O, so that the coverage area of ​​the emitted light does not cover the predetermined axis O as much as possible. That is, there is a certain distance between the boundary of the coverage area of ​​the emitted light and the predetermined axis O, so that the emitted light will not illuminate the predetermined axis O. In this way, when the diffraction grating 40 rotates above the first light source 10, the angle between the first light source 10 and the optical path of the emitted light is as large as possible, which can increase the effective incident time of the emitted light on the diffraction grating 40, thereby expanding the area corresponding to the diffraction spot and improving the diffraction efficiency. In this embodiment of the application, the number of diffraction gratings 40 on the rotating member 32 can be one or more, to achieve different optical effects.

[0042] As an example, when a diffraction grating 40 is provided on the rotating component 32, when the diffraction grating 40 rotates into the coverage area of ​​the emitted light, the emitted light penetrates the diffraction grating 40 and exits. During this period, as the diffraction grating 40 rotates around a predetermined axis O under the drive of the rotating mechanism 30, the incident angle of the emitted light on the diffraction grating 40 changes, which can be considered as the emitted light sweeping across the diffraction grating. Because the incident angle of the emitted light on the diffraction grating 40 changes, the exit angle of the emitted light after passing through the diffraction grating 40 also changes. Therefore, if the diffraction grating 40 is within the coverage area of ​​the emitted light during its rotation, the diffraction spot corresponding to the emitted light will also move linearly on the projection surface, causing multiple diffraction spots to exhibit linear movement on the imaging surface, creating an effect similar to a meteor shower, enriching the user's viewing experience. When the diffraction grating 40 continues to rotate until it is completely outside the coverage area of ​​the emitted light, no diffraction spots will appear on the imaging surface. As the rotating mechanism 30 rotates continuously, the diffraction spot on the imaging surface moves linearly at intervals and periods.

[0043] As another example, to further enrich the projected light effect, the rotating component 32 of the rotating mechanism 30 can be provided with multiple diffraction gratings 40, such as... Figure 5 As shown, a plurality of diffraction gratings 40 are arranged around a predetermined axis O and are distributed sequentially at intervals on the outer periphery of the predetermined axis O. Each diffraction grating 40 can be perpendicular to the end face of the rotating member 32, that is, each diffraction grating 40 can be parallel to or coincide with the predetermined axis O. Figure 5 (The diffraction gratings are roughly overlapping). Multiple diffraction gratings 40 are arranged roughly radially, and the angle between two adjacent diffraction gratings 40 (the angle between their planes) is greater than or equal to 100 degrees and less than or equal to 160 degrees; for example, this angle can be 120 degrees. When the first diffraction grating 40 rotates into the coverage area of ​​the emitted light, the emitted light penetrates the first diffraction grating 40 and exits. The first diffraction grating 40 continues to rotate, and the diffraction spot corresponding to the emitted light moves linearly on the imaging surface. When the first diffraction grating 40 rotates into the coverage area of ​​the emitted light, the second diffraction grating 40 adjacent to the first diffraction grating 40 just begins to enter the coverage area of ​​the emitted light, and the diffraction spot corresponding to the emitted light continues to move linearly on the imaging surface. Therefore, with the continuous rotation of the rotating mechanism 30, the diffraction spot on the imaging surface can periodically move linearly with almost no interval. In this embodiment, the number of diffraction gratings 40 that can be provided on the rotating member 32 of a rotating mechanism 30 is not limited. For example, four, six, seven, eight, or ten or more diffraction gratings 40 can be provided on the rotating member 32 of a rotating mechanism 30. For another example, the number of diffraction gratings 40 provided on the rotating member 32 of a rotating mechanism 30 is greater than or equal to three and less than or equal to eight.

[0044] Specifically Figure 5 In the illustrated embodiment, three diffraction gratings 40 are provided on the rotating component 32 of a rotating mechanism 30. The three diffraction gratings 40 are all arranged radially around the periphery of a predetermined axis O, with the angle between adjacent diffraction gratings 40 being approximately 120 degrees. Figure 5 In the process, when the rotating mechanism 30 rotates clockwise, the first diffraction grating 40 enters the coverage area of ​​the emitted light. At this point, the first diffraction grating 40 intersects the optical path of the emitted light, and the emitted light must pass through the first diffraction grating 40 to exit. As the rotating mechanism 30 rotates, the relative angle between the first diffraction grating 40 and the optical path of the emitted light changes. When this relative angle changes to approximately 45 to 50 degrees, the first diffraction grating 40 leaves the coverage area of ​​the emitted light, and at this time, the second diffraction grating 40 enters the coverage area of ​​the emitted light, ensuring the continuity of the projected light effect. Figure 5 It can be seen that when each diffraction grating 40 rotates within the coverage area of ​​the emitted light, the relative angle between the diffraction grating 40 and the optical path of the emitted light changes from about 0 degrees to 50 degrees (e.g., from 0 degrees to 45 degrees), which can ensure that the projected diffraction spot always diverges from the center to the distance.

[0045] Please see Figure 6 In other embodiments, the number of rotating mechanisms 30 can be multiple, and the multiple rotating mechanisms 30 are arranged sequentially and at intervals around a predetermined center on the substrate 60. The multiple rotating mechanisms 30 can be distributed at equal intervals. Each rotating component 32 of the rotating mechanism 60 is provided with at least one diffraction grating 40, wherein the predetermined center can be a reference geometric center on the substrate 60, so as to make the mass distribution of the projection imaging device 100 more uniform, which is beneficial to improving its structural stability. Correspondingly, the number of first light sources 10 can also be multiple. The multiple rotating mechanisms 30 and the multiple first light sources 10 are arranged in a one-to-one correspondence. For example, each rotating mechanism 30 is arranged opposite to a corresponding first light source 10 for diffracting the emitted light of the corresponding first light source 10. Therefore, by sequentially and spaced around a predetermined center on the substrate 60, for example, the rotating mechanisms 30 can be arranged in a circle, and the light emitted from the diffraction gratings 40 corresponding to the multiple rotating mechanisms 30 can cover the projection area corresponding to the circle, after the emitted light from each first light source 10 is emitted to the diffraction grating 40 of the corresponding rotating mechanism 30, the linear movement of the diffracted light spot in the projection area corresponding to the circle can present an effect of diverging from the center to the surroundings or contracting from the surroundings to the center.

[0046] In this embodiment, there are four first light sources 10 and four rotating mechanisms 30, which are evenly distributed around the periphery of the transmission member 74. Measuring the relative position of each rotating mechanism 30 by its corresponding rotation axis, the angle between the rotation axis of each rotating mechanism 30 and the transmission axis of the adjacent rotating mechanism 30 is considered to be 90 degrees. Therefore, when the transmission member 74 drives the rotating mechanisms 30 to rotate, four sets of star arrays with 90-degree angles to each other will be projected onto the imaging surface. Visually, the star points on the entire projection surface appear to be moving linearly from the inside out, creating a sense of movement.

[0047] Similarly, in other embodiments, when there are three first light sources 1 and three rotating mechanisms 30, the three rotating mechanisms 30 are distributed at equal intervals around the transmission member 74. Measuring the relative positions of the three by the rotation axis corresponding to each rotating mechanism 30, the angle between the rotation axis corresponding to each rotating mechanism 30 and the transmission axis corresponding to the adjacent rotating mechanism 30 can be considered to be 120 degrees. Therefore, in this embodiment, when the transmission member 74 drives the rotating mechanism 30 to rotate, three sets of star arrays with an angle of 120 degrees to each other will be projected onto the imaging surface. Visually, the star points on the entire projection surface are making linear movements radiating outwards, thus creating a sense of movement. By analogy, in other embodiments, the number of first light sources 10 and rotating mechanisms 30 can be two, five, or more.

[0048] Furthermore, in such Figure 6 In the illustrated embodiment, multiple rotating mechanisms 30 are all driven by the same driving mechanism 70. The driving mechanism 70 includes the previously described rotating drive source 72 and a transmission member 74 (worm gear). The transmission member 74 (worm gear) is located at a predetermined center of the substrate 60. Multiple rotating mechanisms 30 are arranged around the transmission member 74 (worm gear) and are roughly circularly arranged around its periphery. The rotating member 32 (gear) of each rotating mechanism 30 meshes with the transmission member 74 (worm gear). When the transmission member 74 (worm gear) rotates, it drives the rotating members 32 (gears) of multiple rotating mechanisms 30 to rotate simultaneously. This allows the linear movement of the diffraction spot in the projection area corresponding to the circumference to exhibit an effect of either diverging from the center outwards or contracting from the periphery towards the center. By simultaneously driving multiple rotating mechanisms 30 with one driving mechanism 70, the structure of the projection imaging device 100 becomes more compact, and the consistency of the diffraction spot's movement rhythm is improved.

[0049] In the above embodiments, the transmission between the drive mechanism 70 and the rotating mechanism 30 is a meshing transmission between a worm gear and a cylindrical gear. In other embodiments, the drive mechanism 70 and the rotating mechanism 30 can also achieve transmission through other structures. For example... Figure 7 In the illustrated embodiment, the transmission component 74 of the drive mechanism 70 includes a bevel gear structure (or the transmission component 74 itself is a bevel gear), and the rotating component 32 of the rotating mechanism 30 also includes a bevel gear structure (or the rotating component 32 itself is a bevel gear). The rotation axis of the bevel gear of the rotating component 32 is the predetermined axis O. The two bevel gear structures mesh with each other for transmission, and the diffraction grating 40 is disposed on the end face of the bevel gear of the rotating component 32. When there are multiple rotating mechanisms 30, such as two or more, the rotating components 32 of the multiple rotating mechanisms 30 are distributed at different parts on the circumference of the bevel gear of the transmission component 74, and all mesh with the bevel gear of the transmission component 74, so that the multiple rotating mechanisms 30 can rotate synchronously under the drive of a single drive mechanism 70.

[0050] In the embodiments provided in this application, the diffraction grating 40 can be relatively fixedly disposed on the side of the rotating member 32 away from the connecting seat 36, so that the transmission member 32 drives the diffraction grating 40 to rotate around a predetermined axis O. During the rotation, the diffraction grating 40 can rotate into the coverage area of ​​the emitted light. When the coverage area of ​​the diffraction grating 40 overlaps with that of the emitted light, the emitted light can always pass through the diffraction grating 40 and be emitted until the diffraction grating 30 rotates to be completely outside the coverage area of ​​the emitted light. Please refer to [link to relevant documentation]. Figure 8 When explaining this phenomenon using projections along the direction of the emitted light, if the projection A of the diffraction grating 40 and the projection B of the light-emitting surface of the first light source 10 overlap during the rotation of the diffraction grating 40, then the emitted light will necessarily be able to penetrate the diffraction grating 40 and undergo diffraction. Figure 8 In the illustrated embodiment, the central angle of rotation (which can be called the effective central angle α) corresponding to the overlapping portion of the projection A of the diffraction grating 40 and the projection B of the light-emitting surface of the first light source 10 is approximately 170 degrees. That is, the emitted light continues to penetrate the diffraction grating 40 and diffract within the 170-degree rotation period of the diffraction grating 40 within the coverage area of ​​the emitted light. However, in some practical applications, it is not necessary for a diffraction grating 40 to correspond to such a long diffraction time. Therefore, in other embodiments of this application, a translation mechanism is provided to enable the diffraction grating 40 to exit the coverage area of ​​the emitted light during the rotation within the aforementioned effective central angle α, thereby obtaining the corresponding light effect. For example, the diffraction grating 40 can also be movably disposed on the rotating member 32, and a translation mechanism is provided to drive the diffraction grating 40 to move in the direction of the diffraction predetermined axis O, so as to exit or enter the coverage area of ​​the emitted light during the rotation within the aforementioned effective central angle α. It should be understood that the "effective central angle α during the 170-degree rotation" and related descriptions above are merely illustrative examples for the purposes of clarity and should not be construed as limiting the embodiments of this application. The translation mechanism will be described in detail below.

[0051] Please see Figure 9 ,exist Figure 9 In the illustrated embodiment, the projection imaging device 100 may further include a translation mechanism 90, which is disposed within the rotation mechanism 30 and is used to drive the diffraction grating 40 to translate along a predetermined axis O during the rotation of the rotation mechanism 30. Specifically, the translation mechanism 90 may be disposed between the connecting seat 36 and the rotating member 32 of the rotation mechanism 30, and can rotate with the rotation of the rotating member 32. The diffraction grating 40 is mounted on the translation mechanism 90 and movably disposed on the rotating member 32 through the translation mechanism 90. The rotating member 32 is used to drive the translation mechanism 90 and the diffraction grating 40 to rotate around the predetermined axis O. While rotating, the translation mechanism 90 also drives the diffraction grating 40 to move along the direction of the predetermined axis O, so that the diffraction grating 40 enters or exits the coverage area of ​​the emitted light along the direction of the predetermined axis O. In the embodiments of this application, the specific implementation of the translation mechanism 90 driving the diffraction grating 40 to move should not be limited.

[0052] As an example, the translation mechanism 90 can have its own drive source, enabling it to drive the diffraction grating 40 to move independently. Specifically, the translation mechanism 90 may include a linear drive (not shown in the figure). The linear drive is mounted on the connecting seat 36. The direction of movement of the mover of the linear drive is the predetermined axis O, which is approximately perpendicular to the optical path of the emitted light or approximately parallel to the substrate 60. The linear drive can be a linear motor, a linear motor with a built-in gearbox, or a linear drive device such as a linear cylinder or a telescopic electric actuator. The drive end of the linear drive is rotatably mounted through the rotating member 32 and can be exposed on the side of the rotating member 32 facing the first light source 10. The diffraction grating 40 is mounted on the drive end of the linear drive. When the rotating member 32 drives the diffraction grating 40 to rotate, if the diffraction grating 40 is within the range covered by the emitted light (e.g., the 170-degree central angle range mentioned above) and does not need to diffract the emitted light, then during the rotation process, the translation mechanism 90 drives the diffraction grating 40 to exit the range covered by the emitted light along the direction of the predetermined axis O.

[0053] Please see Figures 10 to 14 , Figures 10 to 14 A schematic diagram of one structure of the translation mechanism 90 is shown. In this embodiment, please refer to... Figure 10The translation mechanism 90 includes a boss 91 and an elastic support 92. The boss 91 is located on the side of the connecting seat 36 facing the rotating member 32. The elastic support 92 is movably inserted through the rotating member 32 and elastically abuts against the boss 91 and the rotating member 32. The diffraction grating 40 is located on the side of the rotating member 32 away from the boss 91 and is connected to the elastic support 32. When the rotating member 32 rotates, it drives the elastic support 92 and the diffraction grating 40 to rotate around a predetermined axis O. The elastic support 92 slides along the surface of the boss 91, causing the elastic support 92 to carry the diffraction grating 90 in a translational motion in the direction of the predetermined axis O, so that the diffraction grating 90 can enter or exit the coverage area of ​​the emitted light.

[0054] In this embodiment, to accommodate the translation mechanism 90, the connecting seat 36 may further include a receiving portion 367. The receiving portion 367 is disposed between the mounting portion 363 and the rotating member 32 of the connecting seat 36, and surrounds the transition portion 365. The receiving portion 367 is used to accommodate the translation mechanism 90. Specifically, the receiving portion 367 and the transition portion 365 are spaced apart, forming a receiving groove 3670 between them. A boss 91 is disposed on the bottom wall 3671 of the receiving groove 3670 and protrudes relative to the bottom wall 3671 of the receiving groove 3670. When the elastic support 92 rotates under the drive of the rotating member 32, it moves on the boss 91 and the bottom wall 3671. During the process of moving from the boss 91 to the bottom wall 3671, the elastic support 92 can drive the diffraction grating 40 to move along the O direction of the predetermined axis (specifically, the diffraction grating 40 moves closer to the bottom wall 3671). During the process of moving from the bottom wall 3671 to the boss 91, the elastic support 92 can also drive the diffraction grating 40 to move along the O direction of the predetermined axis (specifically, the diffraction grating 40 moves away from the bottom wall 3671, thereby entering the coverage area of ​​the emitted light).

[0055] Specifically in this embodiment, please refer to Figure 11The receiving groove 367 can be roughly cylindrical, and the boss 91 can cover part of the bottom wall 3671, with the other part of the bottom wall 3671 facing the rotating member 32. Of course, the boss 91, the receiving part 367, and the mounting part 363 can be integrally formed or assembled together. This application does not limit this. The above "the boss 91 can cover part of the bottom wall 3671" should be understood as the boss 91 being located at the position of the bottom wall 3671 and connected to the bottom wall 3671, and does not mean that the bottom wall 3671 must necessarily have a physical structure covered by the boss 91. In this embodiment, the boss 91 protrudes towards the rotating member 32 along the predetermined axis O relative to the bottom wall 3671, making the boss 91 relatively closer to the rotating member 32. That is, the distance between the bottom wall 3671 and the rotating member 32 is greater than the distance between the highest point of the boss 91 and the rotating member 32. Therefore, when the elastic support 92 moves on the bottom wall 3671 and the boss 91, it can extend and translate along the predetermined axis O.

[0056] Furthermore, please also refer to Figures 12 to 13 In this embodiment, the boss 91 includes a top surface 911, a first slope 913, and a second slope 915, which are located at opposite ends of the top surface 911. The first slope 913, top surface 911, and second slope 915 are arranged sequentially around the periphery of a predetermined axis O. The top surface 911 is approximately located at the highest point of the boss 91 protruding relative to the bottom wall 3671, and the distances between each point on the top surface 911 and the rotating member 32 are approximately equal. The first slope 913 is generally inclined and connects the top surface 911 and the bottom wall 3671, making the connection between the top surface 911 and the bottom wall 3671 generally smooth. The second slope 915 is also generally inclined and connects the top surface 911 and the bottom wall 3671, making the connection between the top surface 911 and the bottom wall 3671 generally smooth. In this embodiment, the boss 91 is arranged around the periphery of the predetermined axis O. The central angle corresponding to the top surface 911 ranges from 40 to 55 degrees (inclusive), for example, the central angle corresponding to the top surface 911 is 45 degrees. The position of the top surface 911 corresponds to the aforementioned effective central angle α. When the elastic support 92 moves on the top surface 911, its height protruding relative to the rotating member 32 is relatively high, allowing it to rotate within the effective central angle α and enter the coverage area of ​​the emitted light.

[0057] Furthermore, the top surface 911 is located within the coverage area of ​​the aforementioned effective central angle α, and the central angle corresponding to the top surface 911 is smaller than the effective central angle α. Therefore, even if the diffraction grating 40 enters the effective central angle α, if the elastic support 92 contacts the bottom wall 3671, the diffraction grating 40 will be in a retracted state relative to the rotating member 32 and will not be able to enter the coverage area of ​​the emitted light. When the diffraction grating 40 rotates within the effective central angle α and moves along the first slope 913 or the second slope 915 to the top surface 911, the diffraction grating 40 will be in an extended state relative to the rotating member 32, thereby entering the coverage area of ​​the emitted light. When the diffraction grating 40 continues to rotate within the effective central angle α until it rotates out of the effective central angle α or until it moves along the first slope 913 or the second slope 915 to the bottom wall 3671, the diffraction grating 40 will exit the coverage area of ​​the emitted light.

[0058] Please see Figure 14 In this embodiment, the rotating member 32 is provided with a sliding groove 323, which extends along a predetermined axis through opposite sides of the rotating member 32. The sliding groove 323 is used for the elastic support 92 to slide through. Further, the elastic support 92 includes a support member 921, a mounting member 923, and an elastic member 925. The mounting member 923 is movably inserted into the sliding groove 323, and the diffraction grating 40 and the support member 921 are respectively mounted on opposite sides of the mounting member 923.

[0059] Specifically, the mounting component 923 includes a mounting portion 9231 and a movable portion 9233 connected to each other. The mounting portion 9231 is movably disposed in the slide groove 323, and the diffraction grating 40 is mounted on the mounting portion 9231. The movable portion 9233 is disposed at the end of the mounting portion 9231 away from the diffraction grating 40. The movable portion 9233 is generally columnar in shape and extends along a predetermined axis O. The movable portion 9233 is used to mount the elastic member 925.

[0060] The support member 921 is connected to the end of the movable part 9233 away from the mounting part 9231, and is used for sliding engagement with the boss 91. In this embodiment, the radial dimension of the support member 921 is larger than the radial dimension of the movable part 9233 to limit the elastic member 925 on the movable part 9233. The support member 921 achieves sliding engagement by contacting the boss 91 and the bottom wall 3671. Further, in some embodiments, the side of the support member 921 opposite to the mounting part 923 may be provided with rollers (not shown in the figure). The rollers contact the boss 91 or the bottom wall 3671, and the sliding friction of the contact is changed to rolling friction by the rollers, which helps to improve the smoothness of the movement of the elastic support 92 and reduce motion noise.

[0061] The elastic element 925 is movably fitted onto the movable portion 9233 of the mounting member 923 and elastically abuts against the support member 921 and the rotating member 32. Under the elastic abutment of the elastic element 925, the elastic bracket 92 can always maintain contact with the boss 91 or the bottom wall 3671 when rotating around the predetermined axis O, thereby realizing the telescoping movement of the diffraction grating 40. In the embodiments of this application, the specific type of the elastic element 925 should not be limited, and it has the ability to elastically deform. For example, the elastic element 925 can be a spring, a sheet, or an elastic sleeve.

[0062] In this embodiment, the rotating component 32 of the rotating mechanism 30 can be provided with multiple diffraction gratings 40, and the translation mechanism 90 can also be provided with multiple elastic supports 92, with the multiple elastic supports 92 and the multiple diffraction gratings 40 arranged in a one-to-one correspondence. The translation mechanism 90 can control the diffraction gratings 40 entering the coverage area of ​​the emitted light through the boss 91, so that no two or more diffraction gratings 40 exist simultaneously within the coverage area of ​​the emitted light, thereby avoiding cluttered diffraction spots and obtaining a purer linear moving light effect. For example, by reasonably setting the length dimensions of the first slope 913, the second slope 915, and the top surface 911, or their corresponding central angle sizes, the above-mentioned effect can be obtained.

[0063] Specifically, when the first diffraction grating 40 rotates to the position corresponding to the top surface 911 and enters the coverage area of ​​the emitted light, the emitted light penetrates the first diffraction grating 40 and exits. At this time, the second diffraction grating 40 adjacent to the first diffraction grating 40 is still located at the position corresponding to the bottom wall 3671 and has not entered the coverage area of ​​the emitted light. The first diffraction grating 40 continues to rotate, and the diffraction spot corresponding to the emitted light moves linearly on the imaging surface. When the elastic support 92 corresponding to the first diffraction grating 40 moves along the first... As the slope 913 or the second slope 915 slides down, the first diffraction grating 40 gradually rotates out of the coverage area of ​​the emitted light, and the elastic support 92 corresponding to the second diffraction grating 40 just begins to rise along the second slope 915 or the first slope 913 to the top surface 911. The second diffraction grating 40 then enters the coverage area of ​​the emitted light. Therefore, under the continuous rotation of the rotating mechanism 30, the diffraction spot on the imaging surface can make a unidirectional linear movement almost without interval, thereby avoiding the generation of chaotic starlight points.

[0064] In the above embodiments, the translation mechanism 90 drives the diffraction grating 40 to translate along the predetermined axis O through the sliding engagement structure of the elastic bracket 92 and the boss 91. It should be understood that in other embodiments of this application, the translation mechanism 90 can also be implemented in other forms. For example, the translation mechanism 90 may not have the aforementioned boss 91 structure, but may include a linear drive (not shown in the figure) and a bracket (not shown in the figure). The linear drive is disposed on the connecting seat 36, and the bracket is connected between the linear drive and the diffraction grating. Under the drive of the linear drive, the bracket can translate along the direction of the predetermined axis O, so that the diffraction grating 40 enters or exits the coverage area of ​​the emitted light along the direction of the predetermined axis O under the drive of the translation mechanism 90. The bracket in this embodiment can adopt the structure of the elastic bracket 92 provided in any of the above embodiments, or it can be modified based on the structure of the elastic bracket 92 provided in any of the above embodiments (for example, omitting the elastic element 925 in the elastic bracket 92). This specification will not elaborate further. The linear drive in this embodiment can be implemented using a linear motor, linear cylinder, or other linear drive source. In this embodiment, there can be multiple linear drive components and supports, and they are set up one-to-one with multiple diffraction gratings 40.

[0065] Please refer to it again. Figure 2In some embodiments, the projection imaging device 100 may further include a second light source 80, which is disposed inside the housing 50, and the light from the second light source 80 is emitted through the light outlet 521. Specifically, the second light source 80 may be a projection module equipped with a light modulator for projecting a specified image, such as a starry sky background image. Therefore, the effect of a meteor shower or the contraction and divergence of star points created by the diffraction grating 40 can be superimposed on the starry sky background image, making the entire picture more layered and atmospheric, enriching the user's viewing experience. In this embodiment, the second light source 80 may be fixedly disposed inside the housing 50, or the second light source 80 may be movably disposed inside the housing 50, so that the image corresponding to the second light source 80 also moves on the imaging surface, further enhancing the atmosphere of the projected image. For example, the second light source 80 can be directly connected to the transmission component 74, such as by mounting it at the end of the transmission component 74, and rotate with the transmission component 74. Without the need for an additional drive mechanism, it can achieve rotational motion of the background image. This rotational motion differs from the linear motion brought about by the diffraction grating 40, making the entire image more layered and atmospheric, further enriching the user's viewing experience. In other embodiments, the light from the first light source 10 and the second light source 80 can be emitted through the same light outlet or through different light outlets. For example, the housing 50 can have two or more light outlets 521, with the light from the first light source 10 and the second light source 80 each emitted from a corresponding light outlet 521. This allows the projection imaging device 100 to form different lighting effects in different areas, meeting the diverse projection needs of users.

[0066] Please see Figure 15 The present application also provides a lamp 200, which includes a circuit board 210 and the above-mentioned projection imaging device 100. The circuit board 210 can be fixedly disposed on the substrate 60, and the projection imaging device 100 is electrically connected to the circuit board 210.

[0067] In some embodiments, the circuit board 210 may include a control module, which may be a control chip. On one hand, the control module is electrically connected to the rotating mechanism 30 and / or the driving mechanism 70, for controlling the rotational speed of the rotating mechanism 30. On the other hand, the first light source 10 may be a tunable broadband laser generator, and the control module is electrically connected to the broadband laser generator for controlling the broadband laser generator to generate laser light of a specified wavelength.

[0068] In some embodiments, the circuit board 210 may further include a power module, which is connected to the first light source 10, the rotating mechanism 30 and the second light source 80 respectively, and is used to provide power to the first light source 10, the rotating mechanism 30 and the second light source 80.

[0069] This application provides a projection imaging device and a lamp. In this projection imaging device, emitted light generated by a first light source is projected onto a diffraction grating, causing the light emitted through the diffraction grating to carry multiple diffraction spots. This results in an image containing multiple star points (i.e., diffraction spots) when projected onto a projection surface. Furthermore, the projection imaging device includes a rotating mechanism connected to the diffraction grating. Driven by the rotating mechanism, the diffraction grating rotates, causing the emitted light to sweep across the grating. This changes the incident angle of the emitted light on the grating and the exit angle after passing through it. Consequently, during the rotation of the grating, the diffraction spots corresponding to the emitted light move linearly on the projection surface, creating a linear motion effect similar to the movement of meteors, thus enriching the user's viewing experience.

[0070] In practical applications, the number of the aforementioned components is unlimited. When multiple diffraction gratings, corresponding rotating mechanisms, and first light sources are provided, the emitted light exits through multiple diffraction gratings and forms multiple light spots or star patterns on the projection surface. The linear movement of these multiple light spots or star patterns is related to the arrangement of the rotating mechanisms. For example, when multiple rotating mechanisms are arranged in a circle, the linear movement of the multiple light spots or star patterns can appear as a divergence from the center outwards or a contraction from the periphery towards the center. Similarly, when multiple rotating mechanisms are arranged in an array, the linear movement of the multiple light spots or star patterns can appear as an array movement, similar to the effect of a meteor shower. Therefore, the projection imaging device and lamp provided in this application embodiment can achieve various imaging effects, enriching the user's viewing experience.

[0071] In this application specification, certain terms are used to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. The specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to"; "generally" means that those skilled in the art can solve the technical problem within a certain margin of error and basically achieve the technical effect.

[0072] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this application and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0073] In this application, unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or merely surface contact. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A projection imaging device, characterized in that, include: The first light source is used to generate the emitted light; A rotating mechanism is positioned at an interval from the first light source; as well as A diffraction grating is disposed on the rotating mechanism and can rotate around a predetermined axis under the drive of the rotating mechanism to the optical path where the emitted light is located, so that the emitted light can be emitted through the diffraction grating; wherein, the first light source is offset from the predetermined axis, so that the predetermined axis is not parallel to the optical path of the emitted light and is spaced apart, and there is a certain distance between the boundary of the coverage area of ​​the emitted light and the predetermined axis, so that the optical path or the extension line of the optical path does not intersect the predetermined axis. When the diffraction grating rotates around the predetermined axis under the drive of the rotating mechanism, the incident angle of the emitted light on the diffraction grating changes, and the emission angle of the emitted light after passing through the diffraction grating changes accordingly. The light transmitted through the diffraction grating forms a diffraction spot on a designated imaging surface. During the rotation of the rotating mechanism, the diffraction spot is stretched and linearly moved on the imaging surface.

2. The projection imaging device according to claim 1, characterized in that, The optical path of the emitted light is perpendicular to the predetermined axis.

3. The projection imaging device according to claim 1, characterized in that, The rotating mechanism is provided with a plurality of diffraction gratings, which are arranged around the predetermined axis and distributed at intervals in sequence.

4. The projection imaging device according to claim 3, characterized in that, The plane containing the diffraction grating is parallel to or coincides with the predetermined axis.

5. The projection imaging device according to claim 1, characterized in that, The rotating mechanism includes a connecting seat and a rotating component, the rotating component being rotatably disposed on the connecting seat; the projection imaging device further includes a translation mechanism, the translation mechanism being disposed on the connecting seat, the diffraction grating being connected to the translation mechanism and located on the side of the rotating component away from the connecting seat; the diffraction grating, driven by the translation mechanism, enters or exits the coverage area of ​​the emitted light along the direction of the predetermined axis.

6. The projection imaging device according to claim 5, characterized in that, The translation mechanism is disposed between the connecting seat and the rotating member. The diffraction grating is mounted on the translation mechanism and movably disposed on the rotating member through the translation mechanism. The rotating member is used to drive the translation mechanism and the diffraction grating to rotate around the predetermined axis. When the translation mechanism rotates, it drives the diffraction grating to move along the direction of the predetermined axis, so that the diffraction grating enters or exits the coverage area of ​​the emitted light along the direction of the predetermined axis.

7. The projection imaging device according to claim 6, characterized in that, The translation mechanism includes a boss and an elastic bracket. The boss is disposed on the side of the connecting seat facing the rotating member. The elastic bracket is movably inserted through the rotating member and elastically abuts against the boss and the rotating member. The diffraction grating is located on the side of the rotating member away from the boss and is connected to the elastic bracket.

8. The projection imaging device according to claim 7, characterized in that, The connecting seat is provided with a receiving groove, and the boss is disposed on the bottom wall of the receiving groove and protrudes relative to the bottom wall of the receiving groove; when the elastic bracket rotates under the drive of the rotating member, the elastic bracket moves from the boss to the bottom wall or from the bottom wall to the boss, thereby driving the diffraction grating to move along the direction of the predetermined axis.

9. The projection imaging device according to claim 8, characterized in that, The boss includes a top surface, a first slope surface, and a second slope surface. The first slope surface and the second slope surface are located at opposite ends of the top surface. The value range of the central angle corresponding to the top surface is greater than or equal to 40 degrees and less than or equal to 55 degrees.

10. The projection imaging device according to claim 7, characterized in that, The rotating component is provided with a sliding groove, which passes through opposite sides of the rotating component along the predetermined axis; The elastic support includes a support member, a mounting member, and an elastic member. The mounting member is movably inserted into the sliding groove. The diffraction grating and the support member are respectively installed on opposite sides of the mounting member. The support member is used to slide with the boss. The elastic member is movably sleeved on the mounting member and elastically abuts against the support member and the rotating member.

11. The projection imaging device according to claim 5, characterized in that, The translation mechanism includes a linear drive and a bracket. The linear drive is disposed on the connecting seat, and the bracket is connected between the diffraction grating and the linear drive.

12. The projection imaging device according to claim 1, characterized in that, The projection imaging device further includes a substrate, and the first light source is fixedly disposed on the substrate; the rotating mechanism includes a rotating member, which is rotatably disposed on the substrate, and the diffraction grating is mounted on the rotating member.

13. The projection imaging device according to claim 12, characterized in that, The rotating mechanism further includes a rotating drive component, which is disposed on the substrate. The rotating component is connected to the output end of the rotating drive component and rotates around the predetermined axis under the drive of the rotating drive component.

14. The projection imaging device according to claim 12, characterized in that, The projection imaging device further includes a rotation drive source and a transmission component, wherein the rotation drive source is mounted on the substrate. The rotating component is connected to the rotation drive source via the transmission component, so as to rotate around the predetermined axis under the drive of the rotation drive source; the diffraction grating is disposed on the rotating component.

15. The projection imaging apparatus according to claim 14, characterized in that, The transmission component is a worm gear, the rotating component is a cylindrical gear, the cylindrical gear meshes with the worm gear, and the diffraction grating is disposed on the end face of the gear; or The transmission component includes a bevel gear structure, the rotating component includes a bevel gear structure, the bevel gears of the rotating component and the bevel gear structure of the transmission component mesh with each other, and the diffraction grating is disposed on the end face of the rotating component.

16. The projection imaging apparatus according to claim 15, characterized in that, The rotary drive source and the rotary mechanism are located on opposite sides of the substrate, and the transmission component passes through the substrate and meshes with the rotating component.

17. The projection imaging apparatus according to any one of claims 1 to 16, characterized in that, The number of the rotating mechanism and the first light source are both multiple. The multiple rotating mechanisms are arranged sequentially and at intervals around a predetermined center on the substrate. Each rotating mechanism is provided with at least one diffraction grating. Multiple rotating mechanisms and multiple first light sources are arranged in a one-to-one correspondence, and the emitted light from each first light source is emitted onto the diffraction grating on the corresponding rotating mechanism.

18. The projection imaging apparatus according to any one of claims 1 to 16, characterized in that, The projection imaging device further includes a housing and a second light source. The first light source, the diffraction grating, and the rotation mechanism are all disposed within the housing. The housing has a light outlet, which is located on the optical path of the light emitted through the diffraction grating. The second light source is disposed within the housing, and the light emitted from the second light source is emitted through the light outlet.

19. A lamp, characterized in that, include: Circuit board; as well as The projection imaging device according to any one of claims 1 to 18, wherein the projection imaging device is electrically connected to the circuit board.

Images