Low-deformation wavelength conversion device and projection system

Abstract

The utility model discloses a low-deformation wavelength conversion device and a projection system, and the device is characterized in that the device comprises a bearing substrate, the bearing substrate comprises a metal substrate, an elastic layer and a substrate, the metal substrate, the elastic layer and the substrate are stacked in sequence, and the metal substrate and the substrate are bonded into a whole through the elastic layer; and the wavelength conversion layer is arranged on one side, far away from the metal substrate, of the substrate. According to the wavelength conversion device provided by the invention, the bearing substrate comprises the metal substrate, the elastic layer and the substrate, the metal substrate and the substrate are connected through the elastic layer, and the elastic layer has certain elasticity, so that the condition that the device is damaged due to deformation of the metal substrate in the prior art can be solved; the deformation of the metal substrate is relieved through the elastic layer with elasticity; the elastic layer is a bonding layer with good heat dissipation, and the bearing substrate with the novel structure can use a thinner metal substrate, so that the weight of the bearing substrate is reduced to a great extent, and the energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to wavelength conversion technical field more particularly, the utility model relates to a kind of low-deformation wavelength conversion device and projection system. BACKGROUND

[0002] Recently, projection devices mainly using solid-state light sources such as light-emitting diodes (LEDs) and laser diodes are gradually gaining a foothold in the market. Generally speaking, the excitation light of these solid-state light sources is converted by wavelength conversion materials on the wavelength conversion module in the projection device to generate conversion light of different colors.

[0003] In the prior art, the structure of a projection system generally includes a laser module, a dichroic mirror, a light conversion component, and a wavelength conversion device. The current wavelength conversion device includes an aluminum substrate, a wavelength conversion layer, and a diffuse reflection layer. The diffuse reflection layer is arranged on the surface of the substrate, and the wavelength conversion layer is arranged on the surface of the diffuse reflection layer away from the substrate. With the increasing demand for brightness, the power of the laser as the excitation light also increases. On the one hand, the brightness is improved by improving the heat dissipation structure of the wavelength conversion device, and on the other hand, the heat dissipation is improved by increasing the diameter of the wavelength conversion device. Generally, the thickness of the aluminum substrate as the wavelength conversion device is between 0.7-1.5 mm. Considering the motor load, the thickness needs to be designed to be thin with the increase of the diameter, but under the condition of long-term high temperature or high temperature rotation, the aluminum substrate is prone to deformation, causing the wavelength conversion layer to crack and fall off or reducing the service life.

[0004] In view of the above, it is necessary to provide a wavelength conversion device and a projection system with a new design or a new structure to solve the technical problems existing in the prior art. UTILITY MODEL CONTENT

[0005] Therefore, it is necessary to provide a low-deformation wavelength conversion device and a projection system to solve the above technical problems.

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

[0007] A low-deformation wavelength conversion device, characterized in that it comprises:

[0008] a bearing substrate, which comprises a metal substrate, an elastic layer, and a substrate arranged in sequence;

[0009] a motor, which is fixedly connected to the center area of the bearing substrate, so that the wavelength conversion device rotates;

[0010] a wavelength conversion layer, which is arranged on the side of the substrate away from the metal substrate.

[0011] In one embodiment, the elastic layer is provided with metal particles.

[0012] In one embodiment, the substrate is provided with a diffuse reflection layer away from the metal substrate, and the diffuse reflection layer is located between the wavelength conversion layer and the substrate.

[0013] In one embodiment, the substrate is a metal sheet or a ceramic sheet.

[0014] In one embodiment, the Shore hardness of the elastic layer ranges from 30A to 70A.

[0015] In one embodiment, a heat insulation component is provided between the carrier substrate and the motor, so that the heat transfer between the carrier substrate and the motor is reduced.

[0016] In one embodiment, the heat insulation component prevents the carrier substrate from directly contacting the motor, and the heat conduction efficiency of the heat insulation component is lower than that of the carrier substrate.

[0017] In one embodiment, the surface of the carrier substrate is provided with a plurality of regions, at least including a non-wavelength conversion region and a wavelength conversion region, and the wavelength conversion layer is provided in the wavelength conversion region.

[0018] In one embodiment, the thickness of the metal substrate is not greater than 1.5mm, and the elastic layer is composed of a high-temperature-resistant adhesive.

[0019] A projection system, characterized in that the projection system comprises the wavelength conversion device according to any one of the preceding claims.

[0020] The beneficial effects of the utility model are:

[0021] (1) The wavelength conversion device provided in the application, wherein the carrier substrate comprises a metal substrate, an elastic layer and a substrate, the metal substrate and the substrate are connected through the elastic layer, the elastic layer has a certain elasticity, which can solve the device damage caused by the deformation of the metal substrate in the prior art, and the deformation of the metal substrate is relieved through the elastic layer with elasticity.

[0022] (2) The elastic layer used in the application is a good heat dissipation adhesive layer, and the carrier substrate with the new structure can use a thinner metal substrate, which greatly reduces the weight of the carrier substrate and reduces energy consumption.

[0023] (3) Furthermore, in order to improve the heat dissipation effect of the carrier substrate, the material of the elastic layer is recombined, and heat-conducting particles with excellent heat dissipation are doped in the elastic layer (adhesive), such as metal particles doped in silica gel, which greatly improves the heat dissipation effect of the carrier substrate.

[0024] (4) Since the bearing substrate needs to bear the role of heat dissipation, when the bearing substrate is connected with the motor, the temperature of the motor is too high, and even the motor is damaged, so the application is provided with a heat insulation component between the motor and the bearing substrate, so that the bearing substrate can effectively isolate the heat conduction to the motor, and the motor is well protected. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure schematic diagram of a low-deformation wavelength conversion device of the utility model;

[0026] Figure 2 It is a structure schematic diagram of a low-deformation wavelength conversion device of the utility model;

[0027] Figure 3 It is a structure schematic diagram of a low-deformation wavelength conversion device of the utility model;

[0028] Figure 4 It is a structure schematic diagram of a low-deformation wavelength conversion device of the utility model;

[0029] Figure 5 It is a structure schematic diagram of a low-deformation wavelength conversion device of the utility model;

[0030] Figure 6 It is a structure schematic diagram of a low-deformation wavelength conversion device of the utility model;

[0031] Figure 7 It is a structure schematic diagram of a low-deformation wavelength conversion device of the utility model;

[0032] Figure 8 It is a structure schematic diagram of a low-deformation wavelength conversion device of the utility model;

[0033] Figure 9 It is a structure schematic diagram of a low-deformation wavelength conversion device of the utility model;

[0034] Figure 10 It is a structure schematic diagram of a low-deformation wavelength conversion device of the utility model;

[0035] Figure 11 It is a simple light path schematic diagram of a projection system of the utility model. DETAILED DESCRIPTION

[0036] For the convenience of understanding the present application, the present application will be described more fully with reference to the accompanying drawings, in which preferred embodiments of the present application are shown. The present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0037] It is noted that when a component is referred to as being "on" another component, it can be directly on the other component or intervening components can also be present. Where a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components can also be present. The terms "vertical", "horizontal", "left", "right", and similar expressions as used herein are for illustrative purposes only and are not intended to be limiting.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] A low-deformation wavelength conversion device, wherein the wavelength conversion device can be used in a projection system, and can also be used in a light source system, as long as there is a need for wavelength conversion of light emission, the wavelength conversion device designed in the application can be used; the wavelength conversion device mentioned in the application can be a static wavelength conversion device, or a dynamic wavelength conversion wheel; the wavelength conversion device comprises:

[0040] The carrying substrate comprises a first surface and an oppositely arranged second surface, and comprises a metal substrate, an elastic layer and a substrate, and the metal substrate and the substrate are connected through the elastic layer; wherein the first surface of the carrying substrate is a side surface of the substrate away from the metal substrate, and the second surface of the carrying substrate is a surface of the metal substrate away from the substrate; the metal substrate can be an aluminum substrate or a substrate made of other metal materials; the substrate can be an aluminum nitride sheet (ceramic sheet) or a metal sheet; the elastic layer plays a bonding role to connect the metal substrate and the substrate, and the elastic layer needs to have a certain elasticity, so that when the metal substrate is deformed by high temperature, a certain tension is released through the elastic layer to ensure that the substrate is not deformed;

[0041] A wavelength conversion layer is arranged on the side of the substrate away from the metal substrate, the wavelength conversion layer is composed of a fluorescent material, the fluorescent material can be formed on the surface of the substrate by coating, deposition or other methods, and the wavelength conversion layer emits excited light after being irradiated by laser, and then the excited light is emitted directly or after being combined with other light.

[0042] In one embodiment, the Shore hardness of the elastic layer ranges from 30A to 70A, so that the elastic layer has a certain elasticity, and when the metal substrate (for example, an aluminum substrate) is deformed by heat, the elastic layer (for example, silicone) can release the deformation force caused by the metal substrate, so as not to affect the substrate and then affect the wavelength conversion layer. The elastic layer is composed of a high-temperature-resistant adhesive. The reason for choosing a high-temperature-resistant material is that a large amount of heat is generated when the wavelength conversion device is irradiated by laser, and if the elastic layer cannot resist high temperature, the wavelength conversion device will be directly damaged.

[0043] In addition, the elastic layer not only needs to be resistant to high temperature, but also needs to have good heat conduction performance. However, the elastic layer mainly plays the role of an adhesive layer, and generally uses silicone. The thermal conductivity of ordinary organic silicone is about 0.2 W / m·K, and the thermal conductivity of heat-conducting silicone generally ranges from 0.8 to 5.0 W / m·K. Therefore, in this application, according to the design specifications and requirements of the wavelength conversion device, the material of the elastic layer is developed, the elastic layer includes an adhesive and heat-conducting particles, the adhesive can be resin glue, silicone, etc., the heat-conducting particles can be metal particles, polymer particles, and compounds, etc., the proportion of the adhesive is 20 to 70 parts, the proportion of the heat-conducting particles is 30 to 80 parts, the heat-conducting particles are preferably metal particles, and the proportion of the metal particles is 40 to 70 parts, the heat-conducting performance of the elastic layer is the best and the adhesive force for the metal substrate and the substrate is the best. Of course, the elastic layer can also include a plurality of heat-conducting particles, that is, one or more than two combinations of metal particles, polymer particles, and compounds.

[0044] In one embodiment, a reflective layer is arranged on the side of the substrate away from the metal substrate, and the reflective layer is located between the wavelength conversion layer and the substrate. The reflective layer can be a mirror reflection structure or a diffuse reflection structure, the reflective layer is formed on the surface of the substrate by deposition, sputtering or other methods, and the main function of the reflective layer is to reflect the excited light and the excitation light, so as to ensure the utilization rate of light as much as possible.

[0045] In one embodiment, the substrate is made of metal or ceramic. The substrate material can be selected according to the specific application, and can be metal or ceramic. The substrate and the metal substrate form a "sandwich" layered structure through the elastic layer. This structure can reduce or avoid the adverse effects caused by the thermal deformation of the metal substrate. In the same thickness and area, this structure is lighter, which can reduce the energy consumption of the device and is more conducive to the operation of the device. In one embodiment, the thickness of the metal substrate is not greater than 1.5 mm. When the metal substrate is thicker, the thermal deformation will not affect the performance of the device. Therefore, when the metal substrate is thinner, the layered structure can better play its advantages. Of course, the layered structure can also be used for thicker metal substrates.

[0046] In one embodiment, when the wavelength conversion device is dynamic, the wavelength conversion device further comprises a motor fixedly connected with the carrier substrate, so that the wavelength conversion device rotates. In one embodiment, the surface of the carrier substrate is provided with a plurality of regions, at least one of which is a non-wavelength conversion region and the other is a wavelength conversion region. The wavelength conversion layer is arranged in the wavelength conversion region. Different wavelength conversion materials can be arranged in different wavelength conversion regions. When the wavelength conversion device rotates, the laser irradiates the wavelength conversion materials in different wavelength conversion regions. Of course, the wavelength conversion materials arranged in different wavelength conversion regions can also be the same.

[0047] In one embodiment, a heat insulation component is arranged between the carrier substrate and the motor, so that the heat transfer between the carrier substrate and the motor is reduced. Due to the irradiation of the laser, the carrier substrate has to bear a large amount of heat, and the carrier substrate itself has to have good heat conduction performance, which will cause the temperature of the motor in contact with the carrier substrate to be too high. Therefore, in order to protect the motor from being damaged, a heat insulation component is arranged in the area where the carrier substrate contacts the motor. The heat insulation component insulates the carrier substrate from directly contacting the motor, and the heat conduction efficiency of the heat insulation component is lower than that of the carrier substrate. The thermal conductivity of the heat insulation component is less than 10 W / mK.

[0048] A projection system, characterized in that the projection system comprises the wavelength conversion device according to any one of the above embodiments.

[0049] Please refer to Figure 1 and Figure 2A low-deformation wavelength conversion device, the wavelength conversion device comprising a bearing substrate 10, a wavelength conversion region 20 and a non-wavelength conversion region 30, the bearing substrate 10 comprising a first surface and an oppositely arranged second surface, the first surface of the bearing substrate 10 comprising a plurality of sub-regions, wherein at least one sub-region is the wavelength conversion region 20, the wavelength conversion region 20 being provided with a wavelength conversion material to form a wavelength conversion layer 21, the wavelength conversion device being connected with a motor, and the wavelength conversion device being capable of being driven to rotate by the motor.

[0050] Referring to Figure 3 A low-deformation wavelength conversion device, the bearing substrate 10 comprising a metal substrate 11, an elastic layer 12 and a substrate 13, the metal substrate 11 being connected with the substrate 13 through the elastic layer 12, and the wavelength conversion layer 21 being arranged on a side of the substrate 13 away from the metal substrate 11; the metal substrate 11 can be an aluminum substrate, and the thickness of the aluminum substrate is generally not greater than 1.5 mm, of course, the metal substrate 11 can also be of other materials, the elastic layer is generally selected to be a silica gel having a bonding function, and the silica gel needs to have certain high-temperature resistance, the substrate 13 can be a general ceramic sheet, such as aluminum nitride, and can also be other high-temperature resistant materials, and the substrate can also be a high-temperature resistant and less-deformable metal substrate.

[0051] Referring to Figure 4 In another structure, the wavelength conversion device further comprises a reflective layer 50, which can be a total reflection (specular reflection) here, and can also be a diffuse reflection layer, the diffuse reflection layer can be realized by a physical structure or by a diffuse reflection material; the reflective layer 50 is arranged on a side of the substrate 13 away from the metal substrate 11, between the wavelength conversion layer 21 and the substrate 13, so that the reflective layer 50 can reflect laser and excited light.

[0052] Referring to Figure 5 In another structure, the bearing substrate of the wavelength conversion device comprises a metal substrate 11, an elastic layer 14 and the substrate 13, wherein the elastic layer 14 in this structure is different from the elastic layer 12 in the structure, Figure 3 the elastic layer 12 in the structure, Figure 5The elastic layer 14 in the structure is doped with heat-conducting particles. The elastic layer 14 formed by mixing the heat-conducting particles with a binder has not only viscosity and elasticity but also good heat dissipation function. The heat-conducting particles can be metal particles, organic heat-conducting particles or compounds. Preferably, metal particles such as gold, silver, copper, aluminum and other metals with good heat conductivity are used. Of course, the heat-conducting particles doped in the elastic layer 14 can be a mixture of metal ions and compounds or a mixture with organic heat-conducting particles in combination. The proportion of the heat-conducting particles in the elastic layer 14 is very important, which not only relates to the heat-conducting performance of the elastic layer but also directly affects the adhesion of the elastic layer. Therefore, the proportion of the heat-conducting particles is controlled to be between 30 and 80 parts. When the heat-conducting particles are preferably metal particles and the proportion of the metal particles is 40 to 70 parts, the heat conduction and adhesion are best.

[0053] Please refer to Figure 6 , Figure 7 and Figure 8 , another low-deformation wavelength conversion device, the wavelength conversion device further comprises a heat insulation assembly 40, the wavelength conversion device is connected with the motor, the wavelength conversion device is driven to rotate by the motor. Since the wavelength conversion device needs to conduct a large amount of heat to the outside world, when the bearing substrate 10 of the wavelength conversion device is connected with the motor, a heat insulation assembly 40 is arranged between the two, the heat conduction performance of the heat insulation assembly 40 is much smaller than that of the bearing substrate 10. Only in this way can better heat insulation be achieved to avoid damage to the motor by high temperature. Figure 7 and Figure 8 , two different connection modes are given, Figure 7 in which the heat insulation assembly 40 only isolates part of the bearing substrate 10 from the motor, Figure 8 in which the heat insulation assembly 40 directly completely isolates the bearing substrate 10 from the motor to avoid heat conduction between the two, which is more conducive to protecting the motor from being damaged by high temperature.

[0054] Please refer to Figure 9 and Figure 10The wavelength conversion device is static, and the wavelength conversion device comprises a bearing substrate and a wavelength conversion layer 22, the bearing substrate comprises a metal substrate 11, an elastic layer 14 and a substrate 13, the wavelength conversion layer 22 is arranged on the side of the substrate 13 away from the metal substrate 11, and the elastic layer 14 comprises heat-conducting particles, so that the heat-conducting and heat-dissipating effect of the bearing substrate can be well guaranteed; of course, a reflecting layer 51 can also be arranged between the wavelength conversion layer 22 and the substrate 13, and the reflecting layer 51 can be a mirror surface or a diffuse reflector. When the wavelength conversion device is static, the surface of the bearing substrate does not need to be divided into different regions, which is different from a dynamic wavelength conversion device.

[0055] Please see Figure 11 A projection system comprises a wavelength conversion device 100, a laser light source 200, a first optical element 300, a second optical element 310, a light homogenizing element 400 and a beam splitter 500. The laser light source 200 emits excitation light, the excitation light is irradiated to the light homogenizing element 400 after passing through the first optical element 300, and the excitation light is irradiated to the wavelength conversion device 100 after passing through the second optical element 310 and the beam splitter 500. At this time, the wavelength conversion device 100 forms stimulated light after passing through the excitation light, and the stimulated light is emitted after passing through the second optical element 310 and the beam splitter 500. The beam splitter 500 reflects or transmits the excitation light and the light converted by the light conversion component. The wavelength conversion device 100 can be dynamic, and a static wavelength conversion device can also be used. Figure 10 The above merely gives a light path diagram, and a suitable light path can be designed according to different wavelength conversion devices or requirements.

[0056] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail above in combination with the drawings. In the above description, many specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from the above description, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the above disclosed specific embodiments. Moreover, the technical features of the above-mentioned embodiments can be combined arbitrarily, and in order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0057] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several deformations and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A low-deformation wavelength-conversion device, characterized by, The wavelength conversion device comprises: a bearing substrate, which comprises a metal substrate, an elastic layer and a substrate arranged in sequence; the elastic layer bonds the metal substrate and the substrate into one body; a motor, which is fixedly connected with the central region of the bearing substrate, so that the wavelength conversion device rotates; a wavelength conversion layer, which is arranged on the side of the substrate away from the metal substrate.

2. A low-deformation wavelength conversion device according to claim 1, characterized in that, The elastic layer is provided with metal particles.

3. A low-deformation wavelength conversion device according to claim 1, wherein, The side of the substrate away from the metal substrate is provided with a diffuse reflection layer, and the diffuse reflection layer is located between the wavelength conversion layer and the substrate.

4. A low-deformation wavelength conversion device according to claim 2, wherein, The substrate is a metal sheet or a ceramic sheet.

5. A low-deformation wavelength conversion device according to claim 1, wherein, The Shore hardness of the elastic layer ranges from 30A to 70A.

6. A low-deformation wavelength conversion device according to claim 1, wherein, A heat insulation component is arranged between the bearing substrate and the motor, so that the heat transfer between the bearing substrate and the motor is reduced.

7. A low-deformation wavelength conversion device according to claim 6, wherein, The heat insulation component insulates the bearing substrate from directly contacting the motor, and the heat conduction efficiency of the heat insulation component is lower than that of the bearing substrate.

8. A low-deformation wavelength conversion device according to claim 1, wherein, The surface of the bearing substrate is provided with a plurality of regions, at least including a non-wavelength conversion region and a wavelength conversion region, and the wavelength conversion layer is arranged in the wavelength conversion region.

9. A low-deformation wavelength conversion device according to any one of claims 1 to 8, characterized in that, The thickness of the metal substrate is not greater than 1.5 mm, and the elastic layer is composed of a high-temperature-resistant adhesive.

10. A projection system, characterized by The projection system comprises the wavelength conversion device according to any one of claims 1-9.

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