Wavelength conversion wheel and projection system

Abstract

The utility model discloses a wavelength conversion wheel, comprising a substrate, which comprises a first surface and a second surface arranged opposite to the first surface; the wavelength conversion area is located on the first surface of the substrate, and the wavelength conversion area comprises a wavelength conversion layer; the metal heat dissipation layer is at least arranged on one surface of the substrate, a plurality of heat dissipation holes are randomly formed in the metal heat dissipation layer, and at least the plurality of heat dissipation holes exchange heat with the outside. According to the wavelength conversion wheel, the metal with the heat dissipation holes is adopted as the metal in the metal heat dissipation layer, compared with a traditional metal heat dissipation fin, the metal heat dissipation layer with the heat dissipation holes is lighter in mass, the load of the wavelength conversion wheel can be effectively reduced, the stability of the wavelength conversion wheel is improved, and the service life of the wavelength conversion wheel is prolonged. Meanwhile, the heat dissipation effect of the metal heat dissipation layer with the heat dissipation holes is better than that of a traditional metal heat dissipation sheet, the temperature of the fluorescent color wheel can be effectively reduced, and the wavelength conversion efficiency of the fluorescent color wheel is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wavelength conversion, and more specifically, to a wavelength conversion wheel and a projection system. Background Art

[0002] Recently, projection devices mainly based on solid-state light sources such as light-emitting diodes (LEDs) and laser diodes have gradually gained a foothold in the market. Generally speaking, the excitation light of these solid-state light sources will be converted by the wavelength conversion material on the wavelength conversion module in the projection device to generate conversion light of different colors. However, a large amount of heat is generated during the operation of the wavelength conversion wheel, which not only affects its wavelength conversion efficiency but may also cause its damage, thus affecting the performance of the entire projection system.

[0003] Regarding the technical problems existing in the prior art, the main solutions are as follows: Usually, a heat sink is added to the back of the wavelength conversion wheel to help the wavelength conversion wheel dissipate heat and improve its wavelength conversion efficiency. Such heat fins are usually made of metal materials such as aluminum and copper, and they transfer the heat generated by the wavelength conversion wheel to the air through heat conduction, thereby reducing the temperature of the wavelength conversion wheel. However, there are some problems with the existing heat fin designs. First, the metal heat fins are relatively heavy, which will increase the load of the wavelength conversion wheel and affect its stability and service life. Second, the heat dissipation effect of the metal heat fins is limited, especially when a large amount of heat is generated by the wavelength conversion wheel, it cannot effectively reduce its temperature. In addition, the manufacturing cost of the metal heat fins is relatively high, which also increases the cost of the laser display system.

[0004] Therefore, how to design a heat sink that can effectively reduce the temperature of the wavelength conversion wheel, reduce the load of the wavelength conversion wheel, ensure its stability and service life, and has a low cost is an urgent problem to be solved in the current laser display technology field. Summary of the Utility Model

[0005] Based on this, it is necessary to provide a wavelength conversion wheel and a projection system to solve the above technical problems.

[0006] One technical solution of the utility model is as follows:

[0007] A wavelength conversion wheel, characterized by comprising:

[0008] A substrate, the substrate includes a first surface and a second surface arranged opposite to each other;

[0009] A wavelength conversion area, the wavelength conversion area is located on the first surface of the substrate, and the wavelength conversion area includes a wavelength conversion layer;

[0010] A metal heat dissipation layer, the metal heat dissipation layer is provided on at least one surface of the substrate, and a plurality of heat dissipation holes are randomly provided in the metal heat dissipation layer, and at least some of the heat dissipation holes exchange heat with the outside.

[0011] In one embodiment, the projection of the wavelength conversion layer on the second surface of the substrate at least partially overlaps with the projection of the metal heat dissipation layer on the second surface of the substrate.

[0012] In one embodiment, the projection of the wavelength conversion layer on the second surface of the substrate completely overlaps with the projection of the metal heat dissipation layer on the second surface of the substrate.

[0013] In one embodiment, the projection of the wavelength conversion layer on the second surface of the substrate is located within the projection of the metal heat dissipation layer on the second surface of the substrate.

[0014] In one embodiment, the projection of the wavelength conversion layer on the second surface of the substrate does not overlap with the projection of the metal heat dissipation layer on the second surface of the substrate.

[0015] In one embodiment, the metal heat dissipation layer includes a plurality of sub-metal heat dissipation layers, and adjacent sub-metal heat dissipation layers are spaced apart.

[0016] In one embodiment, the interval between the sub-metal heat dissipation layers is less than the width of the sub-metal heat dissipation layers.

[0017] In one embodiment, the thickness of the metal heat dissipation layer is generally not less than 1 mm. Of course, in special cases, the thickness of the metal heat dissipation layer can be 0.5 mm.

[0018] In one embodiment, a bonding layer is provided between the metal heat dissipation layer and the substrate, and the bonding layer is a heat-conducting layer. Wherein, the thickness of the bonding layer is not greater than 1 mm.

[0019] In one embodiment, the volume occupancy rate of the heat dissipation holes in the metal heat dissipation layer is not less than 10% and not greater than 99%.

[0020] A projection system, characterized in that the projection system includes the wavelength conversion wheel according to any one of the above embodiments.

[0021] The beneficial effects of the present utility model:

[0022] 1. The metal in the metal heat dissipation layer provided by this application is a metal with heat dissipation holes. Compared with traditional metal heat dissipation fins, the metal heat dissipation layer with heat dissipation holes has a lighter mass, can effectively reduce the load of the wavelength conversion wheel, improve its stability and service life. At the same time, the heat dissipation effect of the metal heat dissipation layer with heat dissipation holes is better than that of traditional metal heat sinks, and can more effectively reduce the temperature of the fluorescent color wheel and improve its wavelength conversion efficiency;

[0023] 2. The metal heat dissipation layer with heat dissipation holes can be bonded to the inner ring of the substrate through glue. This fixing method is simple and easy to implement, and has high stability, which can effectively prevent the heat sink from falling off or shifting during the rotation of the wavelength conversion wheel, thereby ensuring the heat dissipation effect of the heat sink;

[0024] 3. The manufacturing cost of the metal heat dissipation layer with heat dissipation holes is relatively low, which can effectively reduce the cost of the laser display system, and has high practical value and broad application prospects. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of a wavelength conversion wheel of the present utility model;

[0026] Figure 2 It is a schematic cross-sectional structural diagram of a wavelength conversion wheel of the present utility model;

[0027] Figure 3 It is a schematic cross-sectional structural diagram of the metal heat dissipation layer in a wavelength conversion wheel of the present utility model;

[0028] Figure 4 It is another schematic cross-sectional structural diagram of a wavelength conversion wheel of the present utility model;

[0029] Figure 5 It is another schematic cross-sectional structural diagram of the metal heat dissipation layer in a wavelength conversion wheel of the present utility model;

[0030] Figure 6 It is another schematic cross-sectional structural diagram of a wavelength conversion wheel of the present utility model;

[0031] Figure 7 It is another schematic cross-sectional structural diagram of a wavelength conversion wheel of the present utility model;

[0032] Figure 8 It is another schematic cross-sectional structural diagram of a wavelength conversion wheel of the present utility model. Detailed Embodiments

[0033] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present utility model are shown in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described below. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present utility model more thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0036] A wavelength conversion wheel, which can normally be used in an illumination system or a projection system. Generally, a laser is used to irradiate the phosphor layer on the surface of the wavelength conversion wheel to emit excitation light, thereby achieving the effect of light emission. It is characterized in that the wavelength conversion wheel comprises:

[0037] A substrate, the substrate comprising a first surface and a second surface disposed opposite thereto; the substrate can be an aluminum substrate, or other metal substrates with good heat dissipation effects. Of course, it can also be a transparent substrate, such as a sapphire glass substrate, etc. The central region of the substrate is connected to a motor, so that the motor can drive the substrate to rotate; the substrate can be a whole, or can also be composed of several sub-substrates spliced together. Therefore, the aforementioned whole is relative to the spliced substrate; the surface of the substrate is divided into several regions, and different functions can be set in different regions, such as one or more combinations of a light filtering region, a wavelength conversion region, a transmission region or a diffusion region;

[0038] A wavelength conversion region, the wavelength conversion region being located on the first surface of the substrate, the wavelength conversion region comprising a wavelength conversion layer; two or more wavelength conversion regions can be provided on the first surface of the substrate, and the materials of the wavelength conversion layers provided in each wavelength conversion region can be different, such as a G phosphor region, a Y phosphor region, etc. The function of the wavelength conversion region is to emit stimulated light when irradiated by a laser, meeting the requirements of light emission;

[0039] A metal heat dissipation layer, which is at least disposed on one surface of the substrate. A number of heat dissipation holes are randomly provided in the metal heat dissipation layer, and at least some of the heat dissipation holes exchange heat with the outside; that is to say, the metal heat dissipation layer and the wavelength conversion layer can be on the same side of the substrate and disposed in the inner ring of the first surface of the substrate. In one embodiment, the thickness of the metal heat dissipation layer is not less than 1 mm. The heat dissipation holes can be communicated with each other, or there can be separate non-communicated heat dissipation holes, so that the heat dissipation holes can achieve the purpose of heat exchange with the outside. At the same time, the metal heat dissipation layer is not a whole piece of metal but has many heat dissipation holes, which will inevitably reduce the weight of the metal heat dissipation layer and the burden on the wavelength conversion wheel. Among them, in one embodiment, the volume occupancy rate of the heat dissipation holes in the metal heat dissipation layer is not less than 10% and not more than 99%. Here, the volume occupancy rate refers to the ratio of the volume of all heat dissipation holes to the volume of the metal heat dissipation layer. Therefore, the larger the volume occupancy rate of the heat dissipation holes, the lighter the weight of the metal heat dissipation layer, but it cannot be too large and needs to be within a certain range, because the metal also has good heat dissipation function. When there are more heat dissipation holes, it will inevitably affect the heat dissipation effect.

[0040] In one embodiment, the projection of the wavelength conversion layer on the second surface of the substrate and the projection of the metal heat dissipation layer on the second surface of the substrate at least partially overlap. In one embodiment, the projection of the wavelength conversion layer on the second surface of the substrate completely overlaps with the projection of the metal heat dissipation layer on the second surface of the substrate. In one embodiment, the projection of the wavelength conversion layer on the second surface of the substrate is located within the projection of the metal heat dissipation layer on the second surface of the substrate. Similarly, the projection of the metal heat dissipation layer on the second surface of the substrate is located within the projection of the wavelength conversion layer on the second surface of the substrate; the ultimate goal is to make there be an overlap between the wavelength conversion layer and the metal heat dissipation layer, because the wavelength conversion layer is the main source of heat. To ensure the heat dissipation effect, the wavelength conversion layer and the metal heat dissipation layer should be arranged corresponding to each other.

[0041] In one embodiment, the projection of the wavelength conversion layer on the second surface or the first surface of the substrate does not overlap with the projection of the metal heat dissipation layer on the second surface or the first surface of the substrate. For example, the metal heat dissipation layer is disposed inside the first surface of the substrate, on the same side as the wavelength conversion layer and without superposition; or, the metal heat dissipation layer is disposed inside the second surface of the substrate and does not overlap with the wavelength conversion layer. Such a setting may affect the heat dissipation effect, but this setting method can reduce the moment of inertia of the wavelength conversion wheel and improve the rotational stability of the wavelength conversion wheel. Furthermore, since the metal heat dissipation layer is porous and has a light weight, it can effectively reduce the noise generated during the operation of the wavelength conversion wheel; and a pre-balancing effect can also be achieved by disposing the metal heat dissipation layer on the substrate, thereby ensuring the rotational balance of the wavelength conversion wheel.

[0042] In one embodiment, the metal heat dissipation layer includes a plurality of sub-metal heat dissipation layers, and adjacent sub-metal heat dissipation layers are spaced apart. In one embodiment, the spacing between the sub-metal heat dissipation layers is less than the width of the sub-metal heat dissipation layer. In fact, it can also be understood that the metal heat dissipation layer is divided into several small metal heat dissipation layers (sub-metal heat dissipation layers). Of course, the metal heat dissipation layer can also be an independent and complete structure; there are gaps between the sub-metal heat dissipation layers, which can further reduce the weight of the metal heat dissipation layer without affecting the heat dissipation effect.

[0043] In one embodiment, a bonding layer is provided between the metal heat dissipation layer and the substrate, and the bonding layer is a heat-conducting layer, wherein the thickness of the bonding layer is not greater than 1 mm. The bonding layer can be silicone with good heat-conducting performance, or other heat-conducting colloids, which is more conducive to simplifying the process and does not affect the heat dissipation effect.

[0044] A projection system, characterized in that the projection system includes the wavelength conversion wheel according to any one of the above embodiments.

[0045] Please refer to Figure 1 、 Figure 2 and Figure 3, A wavelength conversion wheel, comprising a substrate 10 and a wavelength conversion layer 20; the substrate 10 includes a first surface and a second surface opposite thereto, several partitions are provided on the first surface of the substrate 10, and at least one partition is a wavelength conversion area, and the wavelength conversion layer 20 is provided in the wavelength conversion area; wherein, the substrate 10 can be an aluminum substrate or a transparent substrate, the material of the wavelength conversion layer 20 can be G phosphor or Y phosphor, and different wavelength conversion areas can be different phosphors. A metal heat dissipation layer 300 is provided on the second surface of the substrate 10, the projected area of the metal heat dissipation layer 300 is larger than the projected area of the wavelength conversion layer 20, and the projected area of the wavelength conversion layer 20 is located within the projected area of the metal heat dissipation layer 300; several heat dissipation holes 301 are provided in the metal heat dissipation layer 300, the heat dissipation holes 301 are randomly provided in the metal heat dissipation layer 300, and the heat dissipation holes 301 can be communicated with each other or can be provided separately. In this way, both the heat dissipation holes 301 and the metal material in the metal heat dissipation layer 300 can play a role in heat dissipation, and the volume occupancy rate of the heat dissipation holes 301 should be controlled within 10% - 99%, so as to ensure the heat dissipation efficiency of the metal heat dissipation layer 300.

[0046] Please refer to Figure 4 and Figure 5 , A wavelength conversion wheel with another structure, the wavelength conversion wheel includes a substrate 10, a wavelength conversion layer 20 and a metal heat dissipation layer 310, the substrate 10 includes a first surface and a second surface opposite thereto, the wavelength conversion layer 20 is provided on the first surface of the substrate 10, the metal heat dissipation layer 310 is provided on the second surface of the substrate 10, the metal heat dissipation layer 310 includes several sub-metal heat dissipation layers, there is a gap between adjacent sub-metal heat dissipation layers, several heat dissipation holes 311 are provided in the sub-metal heat dissipation layers, the heat dissipation holes 311 are randomly provided in the metal heat dissipation layer 310, and the heat dissipation holes 311 can be communicated with each other or can be provided separately. In this way, both the heat dissipation holes 311 and the metal material in the metal heat dissipation layer 310 can play a role in heat dissipation.

[0047] Please refer to Figure 6, which is another wavelength conversion wheel structure. The wavelength conversion wheel includes a substrate 10, a wavelength conversion layer 20, a metal heat dissipation layer 300, an adhesive layer 50, and a motor 40. The motor 40 can drive the substrate 10 to rotate. The substrate 10 includes a first surface and a second surface. The wavelength conversion layer 20 is located on the first surface of the substrate 10. The metal heat dissipation layer 300 is disposed on the second surface of the substrate 10 through the adhesive layer 50. The adhesive layer 50 has the property of heat conduction, and the adhesive layer 50 can be silicone. A layer of silicone with a thickness of 0.2 mm can be evenly applied on the contact surface between the second surface of the substrate and the metal heat dissipation layer first, and then the metal heat dissipation layer is pressed tightly on the substrate, maintaining a pressure of 0.5 MPa for 10 minutes to cure the silicone, thereby firmly bonding the metal heat dissipation layer to the substrate. This fixing method is simple and easy to implement, which can not only ensure the stability of the heat sink but also avoid affecting the normal operation of the wavelength conversion wheel.

[0048] Please refer to Figure 7 , which is another wavelength conversion wheel structure. The wavelength conversion wheel includes a substrate 10, a wavelength conversion layer 20, a metal heat dissipation layer 300, and a motor 40. The motor 40 can drive the substrate 10 to rotate. The substrate 10 includes a first surface and a second surface. The wavelength conversion layer 20 is located on the first surface of the substrate 10. The metal heat dissipation layer 300 is disposed on the inner ring (or inner side) of the second surface of the substrate 10. It can be seen from the figure that there is no overlapping part between the wavelength conversion layer 20 and the metal heat dissipation layer 300. The advantages of such a setting are, firstly, it can play a role in heat dissipation, and secondly, it can reduce the moment of inertia, making the rotation of the wavelength conversion wheel more stable.

[0049] Please refer to Figure 8 , which is another wavelength conversion wheel structure. The wavelength conversion wheel includes a substrate 10, a wavelength conversion layer 20, a metal heat dissipation layer 300, and a motor 40. The motor 40 can drive the substrate 10 to rotate. The substrate 10 includes a first surface and a second surface. The wavelength conversion layer 20 is located on the first surface of the substrate 10. The metal heat dissipation layer 300 is also disposed on the first surface of the substrate 10 and on the inner ring (or inner side) of the wavelength conversion layer 20. It can be seen from the figure that the wavelength conversion layer 20 and the metal heat dissipation layer 300 are on the same surface of the substrate. Such a setting can also play the role of heat dissipation and reducing the moment of inertia.

[0050] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Many specific details have been set forth in the above description to facilitate a full understanding of the present utility model. However, the present utility model can be implemented in many other ways different from those described above, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed above. Moreover, the technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0051] The above-described embodiments merely represent several implementation manners of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A wavelength conversion wheel, characterized in that, Comprising: A substrate, the substrate comprising a first surface and a second surface arranged opposite to each other; A wavelength conversion region, the wavelength conversion region being located on the first surface of the substrate, the wavelength conversion region comprising a wavelength conversion layer; A metal heat dissipation layer, the metal heat dissipation layer being provided on at least one surface of the substrate, a plurality of heat dissipation holes being randomly provided in the metal heat dissipation layer, and at least some of the heat dissipation holes exchanging heat with the outside.

2. The wavelength conversion wheel according to claim 1, wherein The projection of the wavelength conversion layer on the second surface of the substrate at least partially overlaps with the projection of the metal heat dissipation layer on the second surface of the substrate.

3. The wavelength conversion wheel according to claim 2, characterized in that, The projection of the wavelength conversion layer on the second surface of the substrate completely overlaps with the projection of the metal heat dissipation layer on the second surface of the substrate.

4. A wavelength conversion wheel according to claim 2, wherein The projection of the wavelength conversion layer on the second surface of the substrate is located within the projection of the metal heat dissipation layer on the second surface of the substrate.

5. A wavelength conversion wheel according to claim 1, characterized in that, The projection of the wavelength conversion layer on the second surface of the substrate does not overlap with the projection of the metal heat dissipation layer on the second surface of the substrate.

6. A wavelength conversion wheel according to claim 1, wherein, The metal heat dissipation layer comprises a plurality of sub-metal heat dissipation layers, and adjacent sub-metal heat dissipation layers are arranged at intervals.

7. A wavelength conversion wheel according to claim 6, wherein, The interval between the sub-metal heat dissipation layers is less than the width of the sub-metal heat dissipation layers.

8. A wavelength conversion wheel according to any one of claims 1 to 6, characterized in that, A bonding layer is provided between the metal heat dissipation layer and the substrate, and the bonding layer is a heat-conducting layer, wherein the thickness of the bonding layer is not greater than 1 mm.

9. A wavelength conversion wheel according to any one of claims 1 to 6, characterized in that The volume occupancy rate of the heat dissipation holes in the metal heat dissipation layer is not less than 10% and not greater than 99%.

10. A projection system, characterized in that, The projection system comprises the wavelength conversion wheel according to any one of claims 1 to 9 above.

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