CN207689817U - Optical system and projector - Google Patents

Abstract

The utility model relates to an optical system and projector, optical system must include a light source, a shell, a fluorescent wheel and a fan. The light source can output an illumination beam, the shell is provided with an upper cover and a base, and the inner surface and the outer surface of the upper cover and the inner surface and the outer surface of the base are respectively provided with a radiating fin group. The fluorescent wheel is accommodated between the upper cover and the base, the fluorescent wheel is provided with a light receiving surface to receive the illumination light beam, and the fan is arranged in the shell to drive the air in the shell.

Description

Optical system and projector

technical field

The utility model relates to an optical system and a projector.

Background technique

Phosphor wheels are often used in optical systems such as projectors to provide light beams that convert different wavelengths. However, when the fluorescent wheel is used in the laser light source module, because the energy of the laser beam is relatively concentrated, the unit energy density of the fluorescent wheel on the spot when receiving the laser beam is extremely high, which is prone to high temperature, resulting in the loss of phosphor life or luminescence problems such as reduced efficiency.

Utility model content

According to a viewpoint of the present invention, an optical system including a light source, a housing, a fluorescent wheel and a fan is provided. The light source can output an illuminating light beam. The casing is provided with an upper cover and a base, and the inner and outer surfaces of the upper cover and the inner and outer surfaces of the base are respectively provided with a cooling fin group. The fluorescent wheel is accommodated between the upper cover and the base, the fluorescent wheel has a light-receiving surface to receive the light beam, and the fan is arranged in the casing to drive the air in the casing. Thereby, the heat energy inside the shell can be effectively absorbed and dissipated out of the shell through the heat dissipation fin group.

In one aspect of the present invention, the internal fan installed in the housing can directly cause the convection circulation inside the housing, speeding up the flow speed of the air around the fluorescent wheel and improving the heat dissipation efficiency, and the inner and outer surfaces of the housing are designed with cooling fins The heat dissipation surface area can be increased, and the heat dissipation effect can be further improved when the forced convection inside the shell acts on the increased heat dissipation surface area. On the other hand, the internal fan can directly optimize the heat dissipation design for the hot zone of the fluorescent wheel (such as the position of the light spot), such as adjusting the direction of the wind, the angle to blow to the hot zone at the maximum wind speed, or visible cooling fins Adjust the direction and angle of the air outlet to change the internal flow field, which can further improve the effect of cooling the fluorescent wheel in the shell.

According to another aspect of the present invention, an optical system is provided, including a light source, a fluorescent wheel, a casing and two fans, wherein the light source can output an illumination beam. The fluorescent wheel is provided with a light-receiving surface on the path of the illumination beam. The shell is arranged outside the fluorescent wheel, and the shell is respectively provided with a cooling fin group on the outer surface and the inner surface of two corresponding positions corresponding to the periphery of the fluorescent wheel. And the first fan is arranged inside the casing; and a second fan is arranged outside the casing.

In yet another viewpoint of the utility model, the external fan can output a cooling air blown to the shell to cause convective circulation outside the shell. Because the outer surface of the shell is provided with cooling fins, the heat dissipation surface area can be increased, and the forced convection outside the shell Due to the increased heat dissipation surface area, the heat dissipation effect can be further improved. On the other hand, the air outlet direction of the external fan can be adjusted according to the configuration of the heat dissipation fin set. For example, the air flow direction of the external fan can be substantially parallel to the extending direction of the plurality of flow channels formed in the heat dissipation fin set, so as to further reduce wind resistance. And improve the cooling effect.

According to another viewpoint of the utility model, the internal fan blowing to the fluorescent wheel and the external fan blowing to the shell can be installed at the same time, and the internal and external convective circulation can be carried out at the same time with the shell as the boundary, and the heat dissipation fins arranged on the inner and outer surfaces of the shell can be matched. The sheet group can further improve the cooling effect.

In order to make the utility model more obvious and easy to understand, the following examples are used together with the accompanying drawings to describe in detail as follows.

Description of drawings

FIG. 1 depicts a schematic diagram of an optical system of an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional diagram roughly cut along the A-A' direction of Fig. 1 .

FIG. 3 is a schematic diagram showing the relative positions of the second fan and the casing according to an embodiment of the present invention.

FIG. 4 is a schematic diagram showing the relative positions of the second blower fan and the fin flow channel according to an embodiment of the present invention.

Detailed ways

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed descriptions of multiple embodiments with reference to the drawings. In addition, the terms "first" and "second" used in the following embodiments are used to identify the same or similar elements, and the directional terms such as "front" and "rear" are only for referring to the attached drawings The direction is not intended to limit the described elements.

Please refer to FIG. 1 . FIG. 1 depicts a schematic diagram of an optical system according to an embodiment of the present invention. The optical system 10 includes a housing 20 and a light source 32 disposed therein, a light splitting element 34, a fluorescent wheel 36, mirror groups 38, 39, lens groups 42, 43, 44, 46, a first fan 52 and other component groups, and The second fan 54 is disposed outside the casing 20 .

The light source 32 may include light-emitting diode chips, laser diode chips or other light sources that can be used as illumination. In this example, the light source 32 is made by using a multi-chip packaging process (MCP) and includes a plurality of laser light-emitting diode chips arranged in a matrix. laser light-emitting diode modules.

The light-splitting element 34 can be an element that can split the light beam, such as a polar beam splitter, a wave plate, a wavelength beam splitter, a lens or a prism and other optical elements. The light-splitting element in this example is a dichroic mirror (Dichroic mirror) .

The fluorescent wheel 36 can be a total reflection, full transmission or partial transmission and partial reflection type fluorescent wheel; the fluorescent wheel 36 in this example is a partial transmission and partial reflection type fluorescent wheel.

Lens groups 42, 43, 44, 46 can include optical elements such as more than one lens, flyeye lens (flyeye) or prism respectively; Diopter lenses.

In this embodiment, the first fan 52 and the second fan 54 are a blower and a fan respectively. The type of fan can be axial flow, centrifugal, diagonal flow, cross flow, etc., and is not limited.

In this example, the optical system 10 can be the whole or a part of a projector. In this embodiment, the optical system 10 further includes various optical elements such as a light valve, a projection lens, and an optical path between them such as a total reflection prism, in addition to the aforementioned elements. The light valve and the projection lens are respectively placed in the dust-proof cavity inside the casing 20, but it is not limited thereto. In addition, the light source 32 provides an illumination light beam, which is projected onto the light valve in the projector after being processed by the aforementioned components, and the light valve converts the illumination light beam into an image light beam and outputs it through the transparent part of the housing 20 through the projection lens. optical system. The light valve mentioned above is an imaging element commonly used in projectors, which can be transmissive and reflective. Transmissive light valve components such as liquid crystal (LCD), reflective light valve components such as LCOS, digital microlens matrix (DMD) ), or Grating Light Valve (GLV). In this example, the light valve is a digital microlens matrix (DMD) chip. In addition, when the aforementioned optical system 10 is applied to a projector, in addition to the casing 20, the projector must further include another casing to house the aforementioned casing 20 in the optical system 10, and the other part of the projector A casing can communicate with the external environment and has no dustproof effect.

When this embodiment is applied, the light source 32 outputs an illumination beam such as a blue light beam IB. The blue light beam IB will first be reflected by the reflector group 38 and then pass through the lens group 42 and reach the light splitting element 34. The light splitting element 34 can let the blue light The light beam IB passes through and focuses the blue light beam IB on the light-receiving surface 36a of the fluorescent wheel 36 through the positive diopter lens group 43 including a plurality of lenses. The phosphor wheel 36 can rotate continuously, and there are multiple regions with different characteristics on the phosphor wheel 38 , including a light-transmitting region and a phosphor powder region. The phosphor area includes a phosphor layer. When the blue light IB irradiates the phosphor layer on the light-receiving surface 36a, the phosphor layer receives the blue light IB and generates a yellow light IY. The yellow light beam IY is irradiated toward the light splitting element 34 , and the light splitting element 34 guides or reflects the yellow light beam IY to the reflective lens 46 . Subsequent systems can use a dichroic mirror to separate yellow light into green light and red light for corresponding use. On the other hand, the blue light beam IB passing through the light-transmitting area on the fluorescent wheel 36 will sequentially pass through the fluorescent wheel 36 and the lens group 44 having a positive diopter and including multiple lenses, and then reflected by the mirror group 39, Finally, it passes through the beam splitting element 34 and enters the lens 46 .

Therefore, the illumination beam of the light source 32 can be converted into an image beam by a light valve (not shown in the figure) after the above-mentioned processing, and then received by a projection lens (not shown in the figure) to adjust the image beam output. The optical system mentioned in each embodiment of the present invention only needs to be an optical structure using a fluorescent wheel, and is not limited to the optical system of a projector, and those skilled in the art can apply this optical system according to actual needs in any desired situation or environment.

Fig. 2 is a schematic cross-sectional diagram roughly cut along the A-A' direction of Fig. 1 . As shown in Figure 2, in this embodiment, the housing 20 is provided with an upper cover 22 and a base (or lower cover) 24, that is, the fluorescent wheel 36 receiving the illumination beam is accommodated in the upper cover 22 and the base. Between seats 24. In this embodiment, only the peripheral portion of the casing 20 for accommodating the fluorescent wheel 36 is raised in a relative shape according to the shape of the fluorescent wheel. That is to say, the upper cover 22 and the base 24 have a circular inner and outer surfaces where the fluorescent wheel 36 is located, while the rest of the housing is roughly rectangular. Furthermore, the base 24 has an opening 26, the opening 26 allows the manufacturer to assemble various components into the base 24 through the opening 26, and after the assembly is completed, cover the opening with the upper cover 22 and lock and seal the casing 20 An airtight dustproof chamber is formed inside. In this specific embodiment, the height of the fluorescent wheel 36 is greater than the depth of the inner space of the base, and part of the fluorescent wheel 36 will expose the base 24 through the opening 26. With the corresponding shape of the upper cover 22, the fluorescent wheel 36 It will be covered between the upper cover 22 and the base 24 . The heat dissipation mechanism of the optical system of an embodiment of the present invention is described as follows.

As shown in FIG. 2 , in this embodiment, the inner surface IS and the outer surface OS of the upper cover 22 in the circumferential direction of the fluorescent wheel 36 or in the horizontal direction of the light-receiving surface 36a are provided with a cooling fin group, and the fluorescent Corresponding to the circumferential direction of the wheel 36 or the horizontal direction of the light-receiving surface 36a, the inner surface IS and the outer surface OS of the base 24 are also provided with a cooling fin group.

The heat sink group may include various heat dissipation structures of different shapes. In this embodiment, the cooling fin set is a cooling fin set 28 . The heat dissipation fin set 28 includes a plurality of heat dissipation fins 28 a arranged regularly and extending toward the inside and outside of the casing 20 . However, the heat dissipation fin group 28 can also be composed of a plurality of heat dissipation fins arranged irregularly and having different shapes or arrangements or different extending directions. In this embodiment, a channel C can be formed between two adjacent cooling fins 28a. In this embodiment, the outer surfaces OS of the upper cover 22 and the base 24 are respectively provided with cooling fin sets 28 on opposite sides corresponding to the circumferential direction of the fluorescent wheel 36 or the horizontal direction of the light receiving surface 36 a. Alternatively, the outer surface and the inner surface of the casing 20 corresponding to two corresponding positions on the periphery of the fluorescent wheel are respectively provided with a cooling fin group, as shown in the figure, the two corresponding positions are the upper and lower sides. In addition, the first blower 52 can be disposed in the housing 20 to drive the air in the housing 20 . Please refer to FIG. 1 and FIG. 2 at the same time. The first fan 52 can blow air toward the fluorescent wheel 36 along an air outlet direction P. The direction P can intersect with the light-receiving surface 36a of the fluorescent wheel 36 and form an included angle θ, and the included angle θ can be, for example, between 20 degrees and 70 degrees but not limited thereto. As shown in Figure 1, the second fan 54 can be arranged outside the housing 20, and the second fan 54 can output a cooling wind blowing to the housing 20, in this embodiment, the second fan 54 can be along a wind direction Q The wind is blown out to the casing 20 , and the wind blowing direction Q may be substantially parallel to the normal vector direction N of the light receiving surface 36 a.

With the design of the above embodiment, the internal fan installed in the casing can directly lead to the convection circulation inside the casing, speeding up the flow of air around the fluorescent wheel and improving the heat dissipation efficiency, and the design of heat dissipation fins on the inner and outer surfaces of the casing The heat dissipation surface area can be increased, and the heat dissipation effect can be further improved when the forced convection inside the shell cooperates with a larger heat dissipation surface area. On the other hand, the internal fan can directly optimize the heat dissipation design for the hot zone of the fluorescent wheel (such as the position of the light spot), such as adjusting the direction of the wind, the angle to blow to the hot zone at the maximum wind speed, or visible cooling fins Adjust the direction and angle of the air outlet to change the internal flow field, which can further improve the effect of cooling the fluorescent wheel in the shell. Furthermore, the external fan can output a cooling air blown to the casing to cause convection circulation outside the casing. Because the outer surface of the casing is provided with cooling fins, the surface area of heat dissipation can be increased. When the forced convection outside the casing acts on the increased heat dissipation The heat dissipation effect can be further improved when the surface area is increased. In addition, in an embodiment, if an internal fan blowing to the fluorescent wheel and an external fan blowing to the casing are installed at the same time, the internal and external convection circulation is performed simultaneously with the casing as the boundary, and the heat dissipation fins arranged on the inner and outer surfaces of the casing are combined. Group can further improve the cooling effect.

The way that the inner and outer surfaces of the upper cover 22 and the base 24 of FIG. The outer surfaces of the upper cover 22 and the base 24, or only the inner surfaces of the upper cover 22 and the base 24 are provided with cooling fins 28a, or only the outer surfaces of the upper cover 22 and the inner surfaces of the base 24 are provided with cooling fins The form of the sheet 28a etc. is not limited.

FIG. 3 is a schematic diagram showing relative positions of the second fan 54 and the housing 20 according to an embodiment of the present invention. In one embodiment, the heat dissipation fin set 28 can be set so that the air outlet 54a of the second fan 54 covers the upper cover 22 and the base 24, that is, the air outlet 54a can form a substantial overlap with the heat dissipation fin set 28 in space. Combined relationship, the air volume of fan 54 can be utilized more efficiently like this. In addition, as shown in FIG. 4 , in one embodiment, a plurality of flow channels C can be formed between each heat dissipation fin 28 a in the heat dissipation fin group 28 , and the second fan 54 can discharge air to the casing 20 along an air discharge direction Q. , and the air outlet direction Q can be substantially parallel to the extending direction L of the plurality of flow channels C, so as to reduce wind resistance and improve heat dissipation efficiency.

Although the present utility model has been disclosed as above with preferred embodiments, it is not intended to limit the present utility model. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the scope of protection of the present utility model should be defined by the appended claims. In addition, any embodiment or claim of the utility model does not need to achieve all the objects or advantages or features disclosed in the utility model.

Claims (10)

1. an optical system, which is characterized in that including：

One light source, an exportable illuminating bundle；

One shell, is provided with a upper cover and a pedestal, and the inner and outer surfaces of the inner and outer surfaces of the upper cover and the pedestal are respectively set There is a radiating fin group；

One fluorescent wheel, is placed between the upper cover and the pedestal, which has a light receiving surface to receive the illuminating bundle； And

One wind turbine is set in the shell, can drive the air in the shell.

2. optical system as described in claim 1, which is characterized in that the wind turbine faces the fluorescent along one first air-out direction Wheel, which interlocks with the light receiving surface and is in an angle, and the angle is between 20 degree to 70 degree.

3. optical system as described in claim 1, which is characterized in that the outer surface of the upper cover and the pedestal its correspond to the firefly Two corresponding positions of halo periphery are respectively arranged with the radiating fin group, and the wind turbine being set in the shell is one first wind Machine, and the optical system further comprises be set to outside the shell 1 second wind turbine.

4. a kind of optical system, which is characterized in that including：

One light source, an exportable illuminating bundle；

One fluorescent wheel is equipped with a light receiving surface on the illuminating beam path；

One shell is set to outside the fluorescent wheel, and the shell is in the outer surface of two corresponding positions of the corresponding fluorescent wheel periphery and interior Surface is respectively arranged with a groups of fins；

One first wind turbine, is set in the shell；And

One second wind turbine, is set to outside the shell.

5. optical system as claimed in claim 4, which is characterized in that the shell have a upper cover and a pedestal, the upper cover and The pedestal is connected with each other and forms a dust-proof chamber in the enclosure, which includes a radiating fin group, the heat radiating fin Piece group includes an at least radiating fin.

6. the optical system as described in claim 1 or 5, which is characterized in that there is the pedestal opening, the fluorescent wheel to be opened from this Mouth exposes, and the upper cover covers the opening.

7. optical system as described in claim 3 or 4, which is characterized in that second wind turbine is along one second air-out direction to this Shell outlet air, second air-out direction and the normal vector direction of the light receiving surface are substantially parallel.

8. the optical system as described in claim 3 or 5, which is characterized in that second wind turbine is along one second air-out direction to this Shell outlet air is set in those radiating fin groups outside the upper cover or the pedestal and has respectively included a runner, and this second Air-out direction and the extending direction of multiple runners are substantially parallel.

9. the optical system as described in claim 3 or 5, which is characterized in that the light source be include a laser diode shine mould Group, the upper cover are respectively arranged with a radiating fin group relative to the inner and outer surfaces of the circumferencial direction both sides of the fluorescent wheel；The pedestal The inner and outer surfaces of circumferencial direction both sides relative to the fluorescent wheel are respectively arranged with a radiating fin group；First wind turbine is along one First air-out direction is to the fluorescent wheel outlet air, which interlocks with the light receiving surface and be in an angle, and the angle Between 20 degree to 70 degree；The air outlet of second wind turbine is covered the radiating fin group for the outside for setting the upper cover and is set simultaneously The radiating fin group in the outside of the pedestal, along one second air-out direction to the shell outlet air, this second goes out second wind turbine Wind direction and the normal vector direction of the light receiving surface are substantially parallel, if the radiating fin group of the outside of the upper cover and setting the pedestal Outside the radiating fin group in be respectively provided with a runner, and the extending direction essence of second air-out direction and those runners Parallel, which is an air blower, which is a fan.

10. a kind of projector, which is characterized in that including：

Optical system as described in any one of claim 1-5；

The illuminating bundle can be changed into an image strip by one light valve；And

One projection lens is received and is exported after adjusting the image strip.