Diffusion module and projection device

Abstract

The invention provides a diffusion module and a projection device. The diffusion module comprises a motor, a gasket and a light diffusion material. The motor has a rotating plate, wherein the rotating plate is adapted to rotate about a central axis of the motor. The light diffusion material is clamped between the gasket and the rotating plate by the gasket and the rotating plate.

Description

Technical Field

[0001] The invention relates to an optical module, and in particular to a diffusion module and a projection device. Background Art

[0002] With the advancement of display technology and the increasing needs of users, projection devices are also developing towards high brightness. If the brightness of the projection device is insufficient, the image it provides will be easily disturbed by the ambient light. For example, you need to turn off all the lights in the room to clearly view the image provided by the projection device. In contrast, high-brightness projection devices are less prone to this problem. Even if there is a little ambient light in the room, users can still clearly view the image provided by the projection device.

[0003] In order to make the projection device have high brightness, one method is to use a laser light source as the illumination light source. However, since the laser light source has high coherence, this will cause speckle phenomenon to appear on the image screen. In order to improve the speckle phenomenon, a diffuser can be used to scatter the laser light to reduce the coherence of the laser light.

[0004] The current diffuser is set on a disc, and the disc is installed on a motor to be driven by the motor to rotate. When the laser light passes through the rotating diffuser, the speckle phenomenon can be effectively improved. However, the disc is relatively large in size, which will occupy a lot of space inside the projection device, making it difficult for the projection device to meet the trend and demand of miniaturization.

[0005] Therefore, it is necessary to design a new type of diffusion module and projection device to overcome the above defects. Summary of the invention

[0006] The object of the present invention is to provide a diffusion module and a projection device, which can make the diffusion module have a smaller volume by eliminating the design of a large disk.

[0007] To achieve the above objectives, the present invention provides a diffusion module, comprising: a motor having a rotating plate, wherein the rotating plate is suitable for rotating around the central axis of the motor; a gasket; and a light diffusion material, which is clamped between the gasket and the rotating plate.

[0008] Preferably, the outer diameter of the rotating plate is smaller than or equal to the outer diameter of a body of the motor.

[0009] Preferably, the gasket is annular and has an opening, wherein the opening exposes the light diffusion material.

[0010] Preferably, the light diffusing material is square in a viewing angle along the central axis, the opening is circular in a viewing angle along the central axis, and the opening exposes a circular area of ​​the light diffusing material.

[0011] Preferably, it further comprises a haze sheet disposed in front of the light diffusing material, wherein the light beam passes through the haze sheet and then is transmitted to the light diffusing material.

[0012] The present invention also provides a diffusion module, comprising: a motor having a rotating plate, wherein the rotating plate is suitable for rotating around the central axis of the motor; and a light diffusion material attached to the surface of the rotating plate facing away from the body of the motor.

[0013] Preferably, the outer diameter of the rotating plate is smaller than or equal to the outer diameter of the body of the motor.

[0014] Preferably, the rotating plate has a recess on the surface of the main body, and the light diffusion material is disposed in the recess.

[0015] Preferably, it further comprises a haze sheet disposed in front of the light diffusing material, wherein the light beam passes through the haze sheet and then is transmitted to the light diffusing material.

[0016] The present invention also includes a.

[0017] Preferably, the diffusion module comprises: a motor having a rotating plate, wherein the rotating plate is suitable for rotating around the central axis of the motor; and a light diffusion material combined on the side of the rotating plate facing away from the central axis.

[0018] Preferably, the outer diameter of the rotating plate is less than or equal to the outer diameter of the body of the motor.

[0019] Preferably, it further comprises a haze sheet disposed in front of the light diffusing material, wherein the light beam passes through the haze sheet and then is transmitted to the light diffusing material.

[0020] The present invention also includes a projection device, comprising the diffusion module as described above.

[0021] Compared with the prior art, an embodiment of the present invention provides a diffusion module and a projection device, wherein the diffusion module includes a motor, a gasket and a light diffusion material, wherein the motor has a rotating plate, the rotating plate is suitable for rotating around the central axis of the motor, and the light diffusion material is clamped between the gasket and the rotating plate. Since the light diffusion material is arranged on the rotating plate of the motor, rather than on a disc outside the motor as in the prior art, the diffusion module and the projection device can have a smaller volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1A FIG. 4 is a schematic diagram of a light path of a projection device according to an embodiment of the present invention.

[0023] Figure 1B for Figure 1A Schematic diagram of the front view of the motor, light diffuser material and gasket.

[0024] Figure 2A FIG. 4 is a side view of a diffusion module according to another embodiment of the present invention.

[0025] Figure 2B for Figure 2A Schematic diagram of the front view of the motor, light diffuser material and gasket.

[0026] Figure 3 FIG. 4 is a side view of a diffusion module according to another embodiment of the present invention.

[0027] Figure 4 FIG. 4 is a side view of a diffusion module according to another embodiment of the present invention.

[0028] Figure 5 A schematic side view of a motor, a light diffusion material and a gasket according to another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0029] In order to provide a further understanding of the purpose, structure, features and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0030] Figure 1A is a schematic diagram of an optical path of a projection device according to an embodiment of the present invention, and Figure 1B for Figure 1A The front view of the motor, light diffuser and gasket. Figure 1A and Figure 1B The projection device 300 of this embodiment includes a laser module 310, a diffusion module 100, a light valve 320 and a projection lens 330. The laser module 310 is used to emit a light beam 102, and the light beam 102 is, for example, a laser beam. The laser module 310 can have a laser light source of a single color or a plurality of laser light sources of different colors, and the light beam 102 is a laser beam of a single color, or is a mixture of laser beams of different colors. Alternatively, the laser light sources of the laser module 310 of different colors can sequentially emit laser beams of different colors, and the light beam 102 refers to these laser beams of different colors at different times.

[0031] The diffusion module 100 includes a motor 200, a gasket 110, and a light diffusion material 120. The motor 200 has a rotating plate 210, wherein the rotating plate 210 is adapted to rotate around a central axis A1 of the motor 200. The rotating plate 210 may be integrally formed with a rotor 222 of the motor 200, or the rotating plate 210 may be fixed to the rotor 222 of the motor 200 in various ways, for example, the rotating plate 210 may be attached, welded, or locked to the rotor 222 of the motor 200. The light diffusion material 120 is clamped between the gasket 110 and the rotating plate 210.

[0032] In this embodiment, the light diffusion material 120 directly contacts the rotating plate 210, and the light diffusion material 120 is, for example, a diffuse reflection diffusion material. In addition, in this embodiment, the washer 110 is locked on the rotating plate 210 to clamp the light diffusion material 120. For example, the washer 110 can be locked on the rotating plate 210 by screws, bolts or fastening components.

[0033] In this embodiment, the diffusion module 100 further includes a haze sheet 130 disposed in front of the light diffusion material 120 , wherein the light beam 102 passes through the haze sheet 130 and is transmitted to the light diffusion material 120 .

[0034] In this embodiment, the light beam 102 (i.e., the laser beam) emitted by the laser module 310 is diffused by the haze sheet 130 and the light diffusion material 120 in sequence and then transmitted to the light valve 320. The light valve 320 is used to convert the light beam 102 into an image beam 322. The projection lens 330 is arranged on the transmission path of the image beam 322 to project the image beam 322 onto an external screen or projection plane, so that an image picture can be formed on the screen or projection plane to achieve the projection effect. After the light beam 102 (i.e., the laser beam) is diffused by the haze sheet 130 and the light diffusion material 120, its coherence can be reduced, thereby suppressing the speckle phenomenon of the image picture. In particular, the light diffusion material 120 can be driven by the motor 200 to rotate relative to the light beam 102, thereby further reducing the coherence of the light beam 102, thereby having a better suppression effect on the speckle phenomenon of the image picture.

[0035] In the diffusion module 100 of the present embodiment, since the light diffusion material 120 is disposed on the rotating plate 210 of the motor 200, rather than being disposed on a disc outside the motor as in the prior art, the diffusion module 100 can have a smaller volume, thereby meeting the trend of miniaturization of the projection device 300. In the present embodiment, the outer diameter D1 of the rotating plate 120 is less than or equal to the outer diameter D2 of the body 220 of the motor 200, that is, the light diffusion material 120 is disposed on the rotating plate 120 of a very small size, rather than being disposed on a large-sized disc, thereby ensuring that the diffusion module 100 has a small volume. In addition, the radius of the conversion plate 120 (i.e., the moving part) is reduced, which can effectively reduce vibration during rotation.

[0036] In this embodiment, the light diffusion material 120 is in a square shape when viewed along the central axis A1. Figure 1B The light diffuser material 120 can be cut into a square shape, which is easy to apply, convenient for the cutting process, and can reduce waste of the light diffuser material 120. However, in other embodiments, the light diffuser material 120 can also be circular or other shapes when viewed along the central axis A1.

[0037] Figure 2A is a side view schematic diagram of a diffusion module according to another embodiment of the present invention, and Figure 2B for Figure 2A The front view of the motor, light diffuser and gasket. Figure 2A and Figure 2B The diffusion module 100a of this embodiment is similar to Figure 1A The main differences between the two are as follows. In the diffusion module 100a of the present embodiment, the gasket 110a is annular and has an opening 112, wherein the opening 112 exposes the light diffusion material 120. In addition, in the present embodiment, the light diffusion material 120 is square in shape when viewed along the central axis A1 (e.g., Figure 2B The virtual frame represents the edge of the light diffusion material 120, which is shielded by the gasket 110a), the opening 112 is circular in the viewing angle along the central axis A1, and the opening 112 exposes a circular area of ​​the light diffusion material 120, as shown in FIG. Figure 2B drawn.

[0038] Figure 3 This is a side view schematic diagram of a diffusion module according to another embodiment of the present invention. Figure 3 The diffusion module 100b of this embodiment is similar to Figure 1AThe main differences between the two are as follows. In the diffusion module 100b of the present embodiment, the light diffusion material 120 is attached to the surface 212 of the rotating plate 210b facing away from the body 220 of the motor 200b. In the present embodiment, the light diffusion material 120 is directly attached to the rotating plate 210b. In addition, in the present embodiment, the surface 212 of the rotating plate 210b facing away from the body 220 has a recess 213, and the light diffusion material 120 is disposed in the recess 213.

[0039] Figure 4 This is a side view schematic diagram of a diffusion module according to another embodiment of the present invention. Figure 4 The diffusion module 100c of this embodiment is similar to Figure 1A The main differences between the two are as follows. In the diffusion module 100c of this embodiment, the light diffusion material 120 is combined with the side surface 214 of the rotating plate 210 that is opposite to the central axis A1. In this embodiment, the light diffusion material 120 is directly attached to the side surface 214 of the rotating plate 210.

[0040] Figure 5 A schematic side view of a motor, a light diffusion material and a gasket according to another embodiment of the present invention is shown. Figure 5 The motor 200d of this embodiment is Figure 1A The motor 200 is similar to the motor 200 of FIG. 1 , and the main differences between the two are as follows. Figure 1A In the embodiment, the rotor 222 of the motor 200 is embedded in the stator 224, and Figure 5 In the embodiment of the present invention, the stator 224d of the body 220d of the motor 200d is embedded in the rotor 222d. Figure 1A and Figure 5 The same is that the rotating plate 210 can be integrally formed with the rotor 222, 222d, or the rotating plate 210 can be fixed to the rotor 222, 222d in various ways, for example, the rotating plate 210 can be attached, welded or locked to the rotor 222, 222d.

[0041] To summarize, in the diffusion module and the projection device of the embodiments of the present invention, the diffusion module includes a motor, a gasket and a light diffusion material, the motor has a rotating plate, the rotating plate is suitable for rotating around the central axis of the motor, and the light diffusion material is clamped between the gasket and the rotating plate. Since the light diffusion material is arranged on the rotating plate of the motor, rather than on a disc outside the motor as in the prior art, the diffusion module and the projection device can have a smaller volume.

[0042] Although the present invention is described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify the preferred embodiments of the present invention and should not be construed as limiting the present invention. In order to clearly describe the required components, the proportions in the schematic drawings do not represent the proportional relationship of the actual components.

[0043] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A diffusion module, characterized in that: include: A motor having a rotating plate, wherein the rotating plate is adapted to rotate about a central axis of the motor; washer; as well as The light diffusion material is clamped between the gasket and the rotating plate.

2. The diffusion module according to claim 1, characterized in that: The outer diameter of the rotating plate is smaller than or equal to the outer diameter of a body of the motor.

3. The diffusion module according to claim 1, characterized in that: The gasket is ring-shaped and has an opening, wherein the opening exposes the light diffusion material.

4. The diffusion module according to claim 3, characterized in that: The light diffusion material is square in a viewing angle along the central axis, the opening is circular in a viewing angle along the central axis, and the opening exposes a circular area of ​​the light diffusion material.

5. A diffusion module, characterized in that: include: A motor having a rotating plate, wherein the rotating plate is adapted to rotate about a central axis of the motor; as well as The light diffusion material is attached to the surface of the rotating plate which is opposite to the main body of the motor.

6. The diffusion module according to claim 5, characterized in that: The outer diameter of the rotating plate is smaller than or equal to the outer diameter of the body of the motor.

7. The diffusion module according to claim 5, characterized in that: The rotating plate has a concave on the surface facing away from the main body, and the light diffusion material is arranged in the concave.

8. A diffusion module, characterized in that: include: A motor having a rotating plate, wherein the rotating plate is adapted to rotate about a central axis of the motor; as well as The light diffusion material is combined on the side surface of the rotating plate which is away from the central axis.

9. The diffusion module according to claim 8, characterized in that: The outer diameter of the rotating plate is smaller than or equal to the outer diameter of the body of the motor.

10. The diffusion module according to claim 1, 5 or 8, characterized in that: The invention also comprises a haze sheet which is arranged in front of the light diffusion material, wherein the light beam is transmitted to the light diffusion material after penetrating the haze sheet.

11. A projection device, characterized in that: include: A diffusion module as claimed in any one of claims 1 to 10.

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