A diffusion device, a projection device

Abstract

This invention belongs to the field of projection instrument technology and discloses a diffusion device. A driving unit provides independent deformation driving forces to elastic parts one and two, causing the elastic components to deform and drive the diffuser sheet to move, thereby dissipating the light beam and improving image quality. This invention also discloses a projection device with the aforementioned vibration component.

Description

Technical Field

[0001] This invention belongs to the field of projection instrument technology, and particularly relates to a diffusion device and projection equipment. Background Technology

[0002] With the development of projection technology, users have higher demands for resolution, brightness, and contrast. To meet these demands, laser projection technology has emerged. However, this has brought with it the problem of laser speckle. When coherent light from a laser is scattered by a rough surface, it produces ripples with a granular intensity distribution, known as speckle. The presence of speckle severely affects the image quality, reducing image resolution and contrast, and can even harm the eyes. Therefore, speckle has become a significant obstacle to the development of laser projection displays.

[0003] Therefore, light diffusion devices can be used for dissipation, such as... Figure 11 As shown, the driving magnets of existing diffusion devices are all set on the translational plate 20. The translational plate 20 can move along the A direction and the B direction. Driving magnets and coils are set in both the A direction and the B direction. This structure is relatively large. Since the driving magnets in both the A direction and the B direction are set on the translational plate 20, when the driving magnet in the A direction drives the translational plate 20 to move in the A direction, the driving magnet 30 in the B direction will also move in the A direction with the translational plate 20. On the one hand, this will increase the driving force (due to the weight of an additional set of magnets). On the other hand, the driving magnet 30 in the B direction and its corresponding driving coil will have relative movement in the A direction, which will cause the driving force of the driving magnet 30 in the B direction and its corresponding driving coil to change, resulting in unstable driving force. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention discloses a diffusion device that utilizes a movable diffuser plate to circulate along a specific trajectory, achieving a uniform light effect and thereby reducing speckle. This invention also discloses a projection device incorporating the aforementioned diffusion device.

[0005] The specific technical solution of the present invention is as follows:

[0006] A diffusion device includes a base, a carrier, an elastic member, and a driving unit. A diffusion sheet is disposed on the carrier. The carrier is connected to the base via the elastic member. The elastic member includes an elastic part one and an elastic part two, which are connected in series between the base and the carrier. The main deformation direction of the elastic part one and the main deformation direction of the elastic part two form an angle. The driving unit drives the carrier to move relative to the base.

[0007] In existing technologies, there are generally two methods to eliminate speckle. One is the diffuser wheel solution used in laser TVs, where a light-diffusing plate is mounted on the diffuser wheel. The high-speed rotation of the diffuser wheel drives the diffuser plate to rotate, thereby reducing speckle. The disadvantage of this solution is its large size and poor speckle elimination effect. The other is the screen vibration solution, which uses a motor to directly or indirectly vibrate the screen, causing the speckle pattern to change continuously, thereby obtaining uniform light. The disadvantage of this solution is that long-term vibration may damage the structure and materials of the screen, leading to a shortened screen life or a decrease in display effect. In addition, vibration may also generate noise, affecting the user experience, and it is not suitable for all types of screens and display devices. Therefore, this application proposes a technical solution for eliminating speckle by moving the diffuser plate. In this application, the diffuser plate has two-dimensional motion capability. When the diffuser plate moves, it generates more light spot trajectories per unit time and per unit area. By making full use of the divergence angles of different phases on the diffuser plate, more different speckle images are obtained. After superposition, the speckle becomes more uniform, the coherence of the laser is weakened, thereby reducing speckle contrast and speckle. Furthermore, the technical solution of this application has a compact structure, high integration, and low cost.

[0008] Preferably, the elastic member includes a connecting portion disposed between the elastic part one and the elastic part two;

[0009] The driving unit includes a driving unit one and a driving unit two. The driving unit one is disposed between the carrier and the base to drive the elastic part one to deform and move. The driving unit two is disposed between the connecting part and the base to drive the elastic part two to deform and move.

[0010] Alternatively, the elastic member includes a connecting portion, which is disposed on the second elastic portion;

[0011] The driving unit includes a driving unit one and a driving unit two. The driving unit one is disposed between the carrier and the base to drive the elastic part one to deform and move. The driving unit two is disposed between the connecting part and the base to drive the elastic part two to deform and move.

[0012] This structure is simple and easy to implement. It can meet the deformation requirements while ensuring support stability. Based on the independent or combined driving force provided by driving unit one and driving unit two, it can meet the simple harmonic vibration requirements of the diffuser, thereby improving image quality.

[0013] Preferably, the force direction of the first driving unit is along the main deformation direction of the first elastic part, and the force direction of the second driving unit is along the main deformation direction of the second elastic part.

[0014] This structure can effectively achieve independent driving of each force, avoiding interference between the forces of driving unit one and driving unit two, thereby preventing unnecessary shaking of the diffuser during the driving process and effectively improving the driving stability of the diffuser.

[0015] Preferably, the first elastic part and the second elastic part are elastic cantilever arms.

[0016] This structure is simple, reliable, stable, and easy to implement. It can effectively separate the associated interference between two vibration directions, thereby achieving better dissipation.

[0017] Preferably, the length direction of the elastic cantilever of the first elastic part is perpendicular to the length direction of the elastic cantilever of the second elastic part.

[0018] This structure results in high deformation efficiency for both elastic part one and elastic part two. In other words, based on this structure, the driving efficiency of driving unit one and driving unit two is high, which can better improve the motion efficiency of the diffuser.

[0019] Preferably, the elastic cantilever of the first elastic part and the elastic cantilever of the second elastic part are configured as cantilever structures with straight lines.

[0020] This simple structure allows the driving unit to drive only the first elastic part or only the second elastic part to deform. In other words, along the main deformation direction of the first elastic part, the second elastic part does not deform or only undergoes a slight deformation. Similarly, along the main deformation direction of the second elastic part, the first elastic part does not deform or only undergoes a slight deformation. Thus, this structure can effectively separate the first and second elastic parts, thereby achieving independent driving of the diffuser. In other words, when the driving unit simultaneously drives the deformation of both the first and second elastic parts, it can further improve the driving accuracy, thereby achieving better dissipation and ensuring image quality.

[0021] Preferably, the connecting part is a plate-like structure with adjacent side one and side two, the length of side one is greater than the length of side two, side one is connected to elastic part two, and side two is connected to elastic part one.

[0022] The structure is simple, can effectively meet the deformation requirements of elastic part one and elastic part two, and can effectively avoid vibration interference.

[0023] Preferably, the driving unit one includes a magnet one and a coil one, wherein one of the magnet one and the coil one is disposed on a carrier and the other is disposed on a base. The coil one is energized to generate a first driving force along a first direction with the magnet one.

[0024] The second driving unit includes a second magnet and a second coil. One of the magnet and the second coil is disposed on the connecting part, and the other is disposed on the base. The second coil is energized to generate a second driving force along the second direction with the second magnet.

[0025] When coil one and coil two are energized, the energized wires cut the magnetic field lines of magnet one and magnet two, thereby generating an Ampere force to form a driving force. The resultant force of the driving force drives the carrier to move, thus realizing the movement of the diffuser. This structure is simple, has strong driving capability, and can effectively improve the compactness of the diffusion device.

[0026] Preferably, coil one and coil two are wound into non-circular rings, and magnet one and magnet two cover the length of the major axis of the ring in their respective coils.

[0027] This structure can effectively improve the driving capability of drive unit one and drive unit two, ensuring that the diffuser has appropriate movement capability.

[0028] Preferably, the base is provided with a flange, the magnet is bonded to the flange and to the diffuser sheet;

[0029] The connecting part is provided with a second flange, and the second magnet is adhered to the second flange.

[0030] The first and second flanges can position the installation positions of the first and second magnets, thereby improving assembly efficiency; since the first magnet is also bonded to the diffuser sheet, it can also effectively provide the bonding reliability of the diffuser sheet.

[0031] Preferably, the base is configured as a circuit board, the circuit board including multiple sub-circuit boards, each sub-circuit board having a coil one and a coil two.

[0032] Since each sub-circuit board has coil one and coil two, different sub-circuit boards can be energized according to the actual driving force required, thereby expanding the applicability of the vibration component.

[0033] Preferably, the phase difference between the currents flowing through coil one and coil two is adjustable between 0 and 2π.

[0034] The currents flowing through coil one and coil two are either of the same frequency or different frequencies.

[0035] The current frequency ratio and phase difference between coil one and coil two can determine the motion trajectory of the moving part. Different duty cycles correspond to the amplitude of the motion trajectory of the moving part. It can be seen that the larger the duty cycle, the larger the amplitude of the motion trajectory, and the smaller the duty cycle, the smaller the amplitude of the motion trajectory. Therefore, different motion trajectories can be matched according to different optical architectures to better meet the dissipation effect.

[0036] Projection devices, including the diffusion devices described above.

[0037] Compared with the prior art, the present invention realizes the driving of the carrier relative to the base through driving unit one and driving unit two, thereby realizing the driving requirements of the diffuser sheet, so that the diffuser sheet can move according to the preset motion trajectory, thereby obtaining the best dissipation effect and improving the projection quality. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of an embodiment of the present invention;

[0039] Figure 2 for Figure 1 Exploded view;

[0040] Figure 3 for Figure 1 A bottom view of the hidden base;

[0041] Figure 4 for Figure 1 A top view of the hidden mount;

[0042] Figure 5 This is another schematic diagram of an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the base in an embodiment of the present invention;

[0044] Figure 7 These are motion trajectory diagrams of the diffuser sheet under different conditions in embodiments of the present invention;

[0045] Figure 8 This is a schematic diagram of a diffuser sheet in an embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram of a diffuser sheet in an embodiment of the present invention;

[0047] Figure 10 This is a schematic diagram of a diffuser sheet in an embodiment of the present invention;

[0048] Figure 11 This is a schematic diagram of the background technology.

[0049] In the diagram: 1-Carrier; 2-Base; 3-Diffuser; 4-Elastic Part 1; 5-Elastic Part 2; 6-Connecting Part; 7-Magnet 1; 8-Coil 1; 9-Magnet 2; 10-Coil 2; 11-Flange 1; 12-Flange 2; 13-Sub-circuit board; 14-Light transmission hole 1; 15-Light transmission hole 2; 16-Phase delay region; 17-Light transmission area;

[0050] 20 - Translation plate; 30 - Directional drive magnet. Detailed Implementation

[0051] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to specific embodiments.

[0052] like Figures 1-4 As shown, a diffusion device includes a base 2, a carrier 1, an elastic member, and a driving unit. A diffusion sheet 3 is disposed on the carrier 1. The carrier 1 is connected to the base 2 through the elastic member. The elastic member includes an elastic part 4 and an elastic part 5. The elastic part 4 and the elastic part 5 are connected in series between the base 2 and the carrier 1. The main deformation direction of the elastic part 4 and the main deformation direction of the elastic part 5 form an angle. The driving unit drives the carrier 1 to move relative to the base 2.

[0053] This embodiment is illustrated by establishing an orthogonal coordinate system, let the coordinate system be O-XYZ.

[0054] Under the action of the elastic component and the driving unit, the diffuser 3 has two-dimensional simple harmonic motion in the XY plane. When the diffuser 3 moves, it can generate more light spot trajectories per unit time and per unit area. By making full use of the divergence angles of different phases on the diffuser 3, more different speckle images can be obtained. After superposition, the speckle can be made more uniform, the coherence of the laser can be weakened, and the speckle contrast can be reduced. The faster the diffuser 3 moves and the more motion trajectories per unit time and per unit area, the better the speckle suppression effect. Since the size of the driving unit is adjustable in real time, the motion trajectory of the diffuser 3 can be controlled by adjusting the driving force provided by the driving unit, so as to meet the dissipation requirements according to actual needs. Specifically, the elastic component includes a connecting part 6 connected between the elastic part 1 4 and the elastic part 2 5; the driving unit includes a driving unit 1 and a driving unit 2. The driving unit 1 is located between the carrier 1 and the base 2 to drive the elastic part 1 4 to deform, and the driving unit 2 is located between the connecting part 6 and the base 2 to drive the elastic part 2 5 to deform. In this embodiment, the first driving unit controls the deformation of the first elastic part 4, and the second driving unit controls the deformation of the second elastic part 5. That is, the first and second driving units have a weak correlation. Therefore, when the first and second driving units drive the carrier 1, the mutual influence between them is reduced, making the driving waveforms of the first and second driving units more precise and controllable. In other words, in this embodiment, when the first driving unit operates, the first elastic part 4 deforms, but its operation does not cause the second elastic part 5 to deform accordingly. That is, the second driving unit does not move with the first elastic part 4, thus not increasing the preset driving force. Since the second driving unit does not move in the deformation direction of the first elastic part 4, the driving force it provides remains unchanged. Therefore, it is more stable than the prior art, making the entire process of the diffuser 3 more stable. Conversely, the opposite is also true.

[0055] Furthermore, the force direction of the first driving unit is along the main deformation direction of the first elastic part 4, and the force direction of the second driving unit is along the main deformation direction of the second elastic part 5. This structure has high efficiency and can effectively prevent the force of the first driving unit from acting on the second elastic part 5, causing deformation of the second elastic part 5, and can also prevent the force of the second driving unit from acting on the first elastic part 4, causing deformation of the first elastic part 4. In other words, this structure can prevent the first driving unit from driving the first elastic part 4 and the second elastic part 5 to deform simultaneously, and can also prevent the second driving unit from driving the first elastic part 4 and the second elastic part 5 to deform simultaneously. When the diffuser 3 needs to perform simple harmonic motion in two dimensions along the XY plane, the first driving unit and the second driving unit need to apply force simultaneously, thereby achieving precise control of the movement path of the diffuser 3.

[0056] like Figures 1-2 As shown, further, the first elastic part 4 and the second elastic part 5 are each an elastic cantilever. Further still, the length direction of the elastic cantilever of the first elastic part 4 is perpendicular to the length direction of the elastic cantilever of the second elastic part 5. Let the deformation direction of the first elastic part 4 be along the X-axis, and the deformation direction of the second elastic part 5 be along the Y-axis. Since the force direction of the first driving unit is along the main deformation direction of the first elastic part 4, and the force direction of the second driving unit is along the main deformation direction of the second elastic part 5, it can be seen that the main deformation direction of the elastic cantilever of the first elastic part 4 and the second elastic part 5 is perpendicular to the length direction of the elastic cantilever. In the length direction of the elastic cantilever, it cannot undergo elastic deformation or can only undergo small elastic deformation, thus further separating the vibrations in the X-axis and Y-axis directions, thereby reducing the correlation interference in the two vibration directions and making the vibration waveforms in both directions more precise and controllable. Therefore, when the force direction of the first driving unit is perpendicular to the elastic cantilever (X-axis direction) of the first elastic part 4 and along the length direction of the elastic cantilever of the second elastic part 5, the force of the first driving unit will not cause the second elastic part 5 to undergo elastic deformation. Similarly, when the force direction of the second driving unit is perpendicular to the elastic cantilever (Y-axis direction) of the second elastic part 5 and along the length direction of the elastic cantilever of the first elastic part 4, the force of the second driving unit will not cause the first elastic part 4 to undergo elastic deformation. This weakens the correlation between the first driving unit and the second driving unit. Consequently, the corresponding force directions and the elastic cantilever length directions between the first driving unit and the first elastic part 4, and between the second driving unit and the second elastic part 5, have a synergistic effect, achieving precise control of the movement of the diffuser plate 3.

[0057] like Figure 1 and Figure 2 As shown, in this embodiment, the elastic cantilever of elastic part 4 and the elastic cantilever of elastic part 5 are configured as straight cantilever structures. This structure has a high height along the direction of the elastic cantilever, which not only avoids the deformation of elastic part 5 driven by drive unit 1 and the deformation of elastic part 4 driven by drive unit 2, but also prevents the carrier 1 from shaking along the optical axis (Z-axis direction), thereby improving stability. In some technical solutions of this embodiment, the elastic cantilever of elastic part 4 and the elastic cantilever of elastic part 5 are configured as curved or sawtooth structures, but the application effect of such structures is weaker compared to this embodiment.

[0058] like Figures 1-4As shown, in this embodiment, the first driving unit includes a magnet 7 and a coil 8. One of the magnet 7 and the coil 8 is mounted on the carrier 1, and the other is mounted on the base 2. The coil 8 is energized to generate a first driving force along a first direction (X-axis direction) with the magnet 7. The second driving unit includes a magnet 9 and a coil 10. One of the magnet 9 and the coil 10 is mounted on the connecting part 6, and the other is mounted on the base 2. The coil 10 is energized to generate a second driving force along a second direction (Y-axis direction) with the magnet 9. In this embodiment, to improve power output efficiency, the direction of the first driving force is perpendicular to the direction of the second driving force. It is understood that in other embodiments, the first and second directions may intersect at the inner side of the carrier 2.

[0059] Specifically, magnet 7 is mounted on the carrier 1, magnet 9 is mounted on the connecting part 6, coil 8 is mounted on the base 2 corresponding to the position of magnet 7, and coil 10 is mounted on the base 2 corresponding to the position of magnet 9. By energizing coil 8 and coil 10, a magnetic force is formed between coil 8 and magnet 7, and a magnetic force is formed between coil 10 and magnet 9. Figure 6 The diagram illustrates the motion trajectory obtained by comparing the ratio of the current frequency flowing through coil 8 to the current frequency flowing through coil 10, corresponding to the phase difference of the alternating current. The diagram shows the amplitude of the diffuser 3's motion trajectory for different duty cycles. Since a larger duty cycle results in a larger trajectory amplitude, and a smaller duty cycle results in a smaller trajectory amplitude, different motion trajectories can be matched according to different optical architectures to achieve the desired dissipation effect. In this embodiment, the driving signal causes the diffuser 3 to vibrate sinusoidally along the XY plane. The preferred phase difference between the alternating currents flowing between the two coils is π / 2, and the phase difference can be arbitrarily adjusted between 0 and 2π, with frequencies that are the same or different. It should be noted that the amplitude should be as large as possible and should cover the effective optical path. In addition, to ensure the smoothness of the movement, in this embodiment, there are two sets of coil 8 and magnet 7, and coil 10 and magnet 9, which are arranged opposite to each other. That is, in the X-axis direction, the two sets of coil 8 and magnet 7 are arranged opposite to each other, and in the Y-axis direction, the two sets of coil 10 and magnet 9 are arranged opposite to each other.

[0060] In this embodiment, coil 8 and coil 10 are wound into non-circular rings, and magnets 7 and 9 cover the length of the major axis of the ring in their respective coils. Specifically, as... Figure 4As shown, coil 8 and coil 10 have a racetrack-shaped structure, consisting of two straight segments and two curved segments. For magnet 7, magnet 7 is directly opposite one of the straight segments of coil 8, and magnet 7 covers that straight segment along its length. For magnet 9, magnet 9 is directly opposite one of the straight segments of coil 10, and magnet 9 covers that straight segment along its length. Therefore, by ensuring that the length of the magnet covers the length of the corresponding straight segment of the coil as much as possible, the driving capability of drive unit 1 and drive unit 2 can be significantly improved. It is also known that this principle applies when coil 8 and coil 10 have an elliptical structure.

[0061] In this embodiment, as Figures 1-4 As shown, magnet 7 is mounted on the carrier 1, magnet 9 is mounted on the connecting part 6, and coils 8 and 10 are both mounted on the base 2. Generally, magnets are installed by adhesive bonding, which simplifies the assembly process and improves assembly efficiency. Therefore, to further improve assembly efficiency and ensure accurate assembly positioning, such as... Figure 1 As shown, in this embodiment, the carrier 1 is provided with a flange 11, the magnet 7 is bonded to the flange 11 and to the diffuser sheet 3; the connecting part 6 is provided with a flange 2 12, and the magnet 9 is bonded to the flange 2 12. Both flange 11 and flange 2 12 are sheets folded towards the base 2. Furthermore, in this embodiment, the carrier 1 can form the connecting part 6, the elastic part 1 4, and the elastic part 2 5, as well as flange 11 and flange 2 12, by bending the sheet. The sheet has high manufacturing efficiency and low molding cost. In this embodiment, mutual positioning between flange 11, magnet 7, and diffuser sheet 3 is also achieved, thereby further improving the assembly stability of diffuser sheet 3.

[0062] like Figure 5 As shown, to broaden the application scope of this embodiment, the base 2 is configured as a circuit board, which includes multiple sub-circuit boards 13, each of which has a first coil 8 and a second coil 10. Since the base 2 is configured as a circuit board, additional components can be avoided, improving assembly efficiency and relatively reducing the volume occupied. Each sub-circuit board 13 can be energized independently, thus providing users with greater choice. In other words, users can select different numbers of sub-circuit boards 13 to energize according to the required driving force, thereby effectively changing the magnitude of the resultant force of the first and second driving forces to adapt to specific usage needs and achieve better dissipation effect. Of course, the width of the coils is also selected according to different current magnitudes to meet current carrying requirements.

[0063] like Figure 2As shown, in this embodiment, a light-transmitting hole 14 is provided in the middle of the carrier 1, and a light-transmitting hole 15 is provided in the middle of the base 2. The light-transmitting holes 14 and 15 are arranged opposite to each other, and the diffuser 3 is bonded to the light-transmitting hole 14. This structure is simple. By setting the light-transmitting holes 14 and 15, the light beam can be well incident on the diffuser 3, thereby achieving better dissipation and clearer image quality when the diffuser 3 moves harmonicly along the XY plane.

[0064] Therefore, when using this embodiment, the circuit board is energized, causing current to be generated inside coil 8 and coil 10. When coil 8 and coil 10 are energized, the energized wires cut the magnetic field lines, thereby generating a first driving force and a second driving force, causing elastic part 4 and elastic part 5 to deform, thereby driving the carrier 1 to move along the XY plane, so that the diffuser 3 moves in a simple harmonic motion with the carrier 1 in the XY plane.

[0065] It is understood that, in order to ensure the motion stability of the diffuser plate 3 and the supporting stability of the diffuser plate 3, the elastic members are preferably evenly arranged along the circumference of the carrier 2, such as... Figure 5 As shown, in some other embodiments, the elastic member includes a connecting portion 6, which is disposed on the elastic part 2 5; the driving unit includes a driving unit one and a driving unit two. The driving unit one is disposed between the carrier 1 and the base 2 to drive the elastic part 1 4 to deform, and the driving unit two is disposed between the connecting portion 6 and the base 2 to drive the elastic part 2 5 to deform. In this embodiment, the elastic part 1 4 and the connecting portion 6 are not directly connected. This allows the phase transitions of the elastic part 1 4 and the elastic part 2 5 to be independent, making the driving forces provided by the driving unit one and the driving unit two independent, thereby improving the stability of the harmonic motion of the diffuser 3.

[0066] Based on the above embodiments, this embodiment also discloses a projection device. Since the projection device includes the diffusion device described above, when the projection beam is incident on the diffuser 3 and the diffuser 3 undergoes simple harmonic motion along the XY plane, dissipation can be achieved, thereby obtaining a better projection effect and effectively improving the projection image quality.

[0067] Furthermore, the diffuser 3 includes a phase delay region 16 and a light transmission region 17, the light transmission region 17 being used for light diffusion. The phase delay region 16 and the light transmission region 17 are arranged alternately; in a preferred embodiment, the area ratio of the phase delay region 16 to the light transmission region 17 is 1:1. Figures 7-9 As shown, the areas of adjacent phase delay regions 16 and light transmission regions 17 can be the same or different. The area of ​​each phase delay region 16 can be the same or different; the area of ​​each light transmission region 17 can be the same or different.

[0068] In this embodiment, the phase delay region 16 includes at least one of a half-wave plate, a quarter-wave plate, and a three-quarter-wave plate, and the wave plate types provided in all phase delay regions 16 are not entirely the same. In this embodiment, the light transmission region 17 can be coated with an anti-reflection film to achieve light transmission enhancement, and can also be a diffusion region.

[0069] In this embodiment, a portion of the light passes through the phase delay region 16, while the other portion passes through the light transmission region 17. The phase of the light passing through the phase delay region 16 changes to alter its polarization, thus disrupting the phase coherence of the light. When the light transmission region 17 is a diffusion region, the light passing through it diffuses, resulting in more refraction, reflection, and scattering phenomena, which also disrupts the phase coherence of the light. Therefore, by combining these two methods of disrupting the phase coherence of the light, the speckle removal effect, beam quality, illumination effect, and projection effect can be improved more effectively.

[0070] Compared with the prior art, as shown in Table 1 below, the diffuser 3 and the elastic member are smaller in this embodiment. This embodiment can obtain a better effective area utilization rate. In other words, this embodiment can obtain more light spot trajectories and make full use of the divergence angles of different phases on the diffuser 3, thereby more effectively reducing speckle contrast and speckle.

[0071] Table 1 Comparison of Effective Area Utilization Rate of Diffusion Sheets

[0072]

[0073] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be considered as limitations on the present invention, and the scope of protection of the present invention should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A diffusion device, characterized in that, The device includes a base, a carrier, an elastic member, and a driving unit. The carrier is provided with a diffuser plate and is connected to the base via the elastic member. The elastic member includes an elastic part one and an elastic part two, which are connected in series between the base and the carrier. The main deformation direction of the elastic part one and the main deformation direction of the elastic part two form an angle. The driving unit drives the carrier to move relative to the base.

2. The diffusion device as described in claim 1, characterized in that, The elastic component includes a connecting portion disposed between the elastic part one and the elastic part two; The driving unit includes a driving unit one and a driving unit two. The driving unit one is disposed between the carrier and the base to drive the elastic part one to deform and move. The driving unit two is disposed between the connecting part and the base to drive the elastic part two to deform and move. Alternatively, the elastic member includes a connecting portion, which is disposed on the second elastic portion; The driving unit includes a driving unit one and a driving unit two. The driving unit one is disposed between the carrier and the base to drive the elastic part one to deform and move. The driving unit two is disposed between the connecting part and the base to drive the elastic part two to deform and move.

3. A diffusion device as described in claim 2, characterized in that, The force direction of the first driving unit is along the main deformation direction of the first elastic part, and the force direction of the second driving unit is along the main deformation direction of the second elastic part.

4. A diffusion device as described in claim 2, characterized in that, The first elastic part and the second elastic part are elastic cantilever arms, respectively.

5. A diffusion device as described in claim 4, characterized in that, The length direction of the elastic cantilever of the first elastic part is perpendicular to the length direction of the elastic cantilever of the second elastic part.

6. A diffusion device as described in claim 4, characterized in that, The elastic cantilever of the first elastic part and the elastic cantilever of the second elastic part are configured as cantilever structures with straight lines.

7. A diffusion device as described in claim 2, characterized in that, The connecting part is a plate-shaped structure with adjacent side one and side two. The length of side one is greater than the length of side two. Side one is connected to elastic part two, and side two is connected to elastic part one.

8. A diffusion device as described in claim 2, characterized in that, The drive unit 1 includes a magnet 1 and a coil 1. One of the magnet 1 and the coil 1 is disposed on a carrier and the other is disposed on a base. The coil 1 is energized to generate a first driving force along a first direction with the magnet 1. The second driving unit includes a second magnet and a second coil. One of the magnet and the second coil is disposed on the connecting part, and the other is disposed on the base. The second coil is energized to generate a second driving force along the second direction with the second magnet.

9. A diffusion device as described in claim 8, characterized in that, The coil one and coil two are wound into non-circular rings, and the magnet one and magnet two cover the length of the major axis of the ring in their respective coils.

10. A diffusion device as described in claim 8, characterized in that, The base is provided with a flange, and the magnet is bonded to the flange and to the diffuser sheet. The connecting part is provided with a second flange, and the second magnet is adhered to the second flange.

11. A diffusion device as described in claim 8, characterized in that, The base is configured as a circuit board, which includes multiple sub-circuit boards, each of which has a coil one and a coil two.

12. A diffusion device as described in claim 8, characterized in that, The phase difference between the currents flowing through coil one and coil two is adjustable between 0 and 2π. The currents flowing through coil one and coil two are either of the same frequency or different frequencies.

13. A projection device, characterized in that, Includes the diffusion device as described in any one of claims 1 to 12.

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