TWM560038U - Optical system and projector - Google Patents

Abstract

An optical system includes a light source, a casing, a phosphor wheel and an air propeller. The light source outputs an illumination beam. The casing has a cover and a base, and an inner surface and an outer surface of each of the cover and the base are provided with a heat-dissipation fin assembly. The phosphor wheel is disposed between the cover and the base and has a light incident surface to receive the illumination beam. The air propeller is disposed inside the casing to propel the air inside the casing.

Description

Optical system and projector

This creation is about an optical system and projector.

Fluorescent wheels are commonly used in, for example, the optical system of a projector to provide a beam of light that converts different wavelengths. However, when the fluorescent wheel is used in the laser light source module, the energy of the laser beam is concentrated. When the fluorescent wheel receives the laser beam, the unit energy density on the spot is extremely high and the temperature is high, which causes the life of the phosphor powder to be degraded or illuminate. Various problems such as reduced efficiency.

According to one aspect of the present invention, an optical system is provided that includes a light source, a housing, a fluorescent wheel, and a fan. The light source can output an illumination beam, and the outer 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 heat dissipation fin set. The fluorescent wheel is disposed between the upper cover and the base. The fluorescent wheel has a light receiving surface to receive the illumination beam, and the fan is disposed in the outer casing to drive the air in the outer casing. Thereby, the thermal energy inside the casing is effectively absorbed and effectively dissipated outside the casing by the fin group.

In one of the ideas of this creation, the internal fan installed in the outer casing can directly lead to the convection circulation inside the outer casing, accelerate the flow velocity of the air around the fluorescent wheel, and improve the heat dissipation efficiency, and the design of the heat dissipation fins on the inner and outer surfaces of the outer casing can be increased. The large heat dissipation surface area further enhances the heat dissipation effect when forced convection inside the casing acts on the increased heat dissipation surface area. On the other hand, the internal fan can directly optimize the heat dissipation design of the hot zone of the fluorescent wheel (such as the spot position), for example, the direction of the wind can be adjusted, the angle is blown to the hot zone at the maximum wind speed, or the direction of the fins can be visible. And distribution Adjusting the direction and angle of the wind to change the internal flow field can further improve the effect of the fluorescent wheel inside the cooling casing.

According to another aspect of the present invention, an optical system is provided that includes a light source, a fluorescent wheel, a housing, and two fans, wherein the light source can output an illumination beam. The fluorescent wheel is provided with a light receiving surface on the illumination beam path. The outer casing is disposed outside the fluorescent wheel, and the outer casing is provided with a heat dissipating fin set on the outer surface and the inner surface of the two corresponding positions corresponding to the outer periphery of the fluorescent wheel. And the first fan is disposed in the outer casing; and a second fan is disposed outside the outer casing.

In still another aspect of the present invention, the external fan can output a cooling wind blown to the outer casing to cause convection circulation outside the outer casing, and the outer surface of the outer casing is provided with heat dissipating fins to increase the heat dissipating surface area, and the forced convection outside the outer casing acts on The increased heat dissipation surface area further enhances heat dissipation. On the other hand, the external fan can adjust the wind direction according to the arrangement of the heat dissipation fin group. For example, the air outlet direction of the external fan and the extension direction of the plurality of flow channels formed in the heat dissipation fin group can be substantially parallel, thereby further reducing the wind resistance and improving heat radiation.

According to another aspect of the present invention, an internal fan blown to the fluorescent wheel and an external fan blown to the outer casing can be simultaneously provided, and the inner and outer convection cycles are simultaneously performed by the outer casing, and the heat radiating fin set disposed on the inner and outer surfaces of the outer casing is disposed. Can further improve the heat dissipation effect.

In order to make the creation more obvious and easy to understand, the following examples will be described in detail with reference to the accompanying drawings.

10‧‧‧Optical system

20‧‧‧ Shell

22‧‧‧Upper cover

24‧‧‧Base

26‧‧‧ openings

28‧‧‧Solid fin group

28a‧‧‧Heat fins

32‧‧‧Light source

34‧‧‧Spectral components

36‧‧‧ fluorescent wheel

36a‧‧‧Lighted surface

38, 39‧‧‧Mirror group

42, 43, 44, 46‧ ‧ lens group

52, 54‧‧‧ fan

54a‧‧‧air outlet

C‧‧‧ runner

IB‧‧‧Blue Beam

IY‧‧‧Yellow beam

IS‧‧‧ inner surface

OS‧‧‧ outer surface

S‧‧‧ spot

N‧‧‧ normal vector direction

P, Q‧‧‧ direction of the wind

Θ‧‧‧ angle

1 is a schematic diagram showing an optical system of an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view schematically showing the cutting in the direction of A-A' in Fig. 1;

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

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

The foregoing and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the embodiments of the invention. 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", "back", etc. are merely referenced to additional drawings. The orientation is not intended to define the components.

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

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

The light splitting element 34 may be an element capable of splitting a light beam, for example, a polar beam splitter, a wave plate, a wavelength splitter, a lens, or an optical element such as a germanium. The splitting element in this example is a dichroic mirror. .

The fluorescent wheel 36 can be a fully reflective, fully penetrating or partially penetrating partial reflective fluorescent wheel; the fluorescent wheel 36 in this example is a partially penetrating partially reflective fluorescent wheel.

The lens groups 42, 43, 44, 46 may respectively include one or more optical elements such as a lens, a flyeye or a helium; in this example, the lens groups 42, 43, 44, 46 each include at least one A lens with diopter.

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

In this example, optical system 10 can be an integral part of a projector or a portion thereof. In the present embodiment, the optical system 10 further includes various optical elements such as a light valve, a projection lens, and a light path between them, such as a total reflection 稜鏡, in addition to the aforementioned components. The light valve and the projection lens are respectively disposed in the dustproof cavity inside the outer casing 20, but not limited thereto. In addition, the light source 32 provides an illumination beam that is processed by the aforementioned components and projected onto a light valve in the projector, and the light valve converts the illumination beam into an image beam and passes through the projection lens through the transparent portion of the housing 20. Output optical system. The aforementioned light valve is an imaging element commonly used in projectors, and can be a transmissive and reflective type, a transmissive light valve element such as a liquid crystal (LCD), a reflective light valve element such as an LCOS, a digital microlens matrix (DMD). ), or a grating light valve (GLV). In this example, the light valve is a digital microlens matrix (DMD) wafer. In addition, when the aforementioned optical system 10 is applied to a projector, the projector may further include another housing in addition to the housing 20 to accommodate the housing 20 in the optical system 10 described above, and the projector is another A housing can be connected to the external environment and is not dustproof.

In this embodiment, the light source 32 outputs an illumination beam such as a blue light beam IB. The blue light beam IB is first reflected by the mirror group 38, passes through the lens group 42 and reaches the beam splitting element 34, and the light splitting element 34 allows the blue light beam IB passes and makes the blue beam IB positive through the diopter and includes The lens group 43 of a plurality of lenses is focused on the light receiving surface 36a of the fluorescent wheel 36. The fluorescent wheel 36 is continuously rotated, and the fluorescent wheel 38 has a plurality of regions of different characteristics, including a light transmitting region and a phosphor powder region. The phosphor area includes a phosphor layer. When the blue light IB beam is irradiated onto the phosphor layer on the light receiving surface 36a, the phosphor layer receives the blue light beam IB and generates a yellow light beam IY. The yellow light beam IY is irradiated toward the light splitting element 34, and the light splitting element 34 redirects or reflects the yellow light beam IY to the reflective lens 46. Subsequent systems can divide the yellow light into green light and red light by a dichroic mirror. On the other hand, the blue light beam IB passing through the light-transmitting region on the fluorescent wheel 36 sequentially passes through the fluorescent wheel 36 and the lens group 44 having a positive refractive power and including a plurality of lenses, and then is reflected by the mirror group 39, and finally passes through The beam splitting element 34 enters the lens 46.

Therefore, after the illumination beam of the light source 32 is processed by the light valve (not shown), the illumination beam is converted into an image beam and then received by a projection lens (not shown) and the image beam is adjusted. Output. The optical system mentioned in the various embodiments of the present invention only needs to be an optical structure using a fluorescent wheel, and is not limited to an optical system of a projector, and a person skilled in the art can apply the optical system to any one according to actual needs. The situation or environment required.

Fig. 2 is a schematic cross-sectional view schematically showing the cutting in the direction of A-A' in Fig. 1; As shown in FIG. 2, in the embodiment, the outer casing 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 disposed on the upper cover 22 and the base 24. between. In the present embodiment, the outer casing 20 is only a ridge of a relative shape in the peripheral portion of the accommodating fluorescent wheel 36 in accordance with the shape of the fluorescent wheel. That is, the upper cover 22 and the base 24 are formed in a circular shape on the inner and outer surfaces of the fluorescent wheel 36, and the remaining portion of the outer casing is substantially rectangular. Moreover, the base 24 has an opening 26 that allows the manufacturer to assemble the various components from the opening 26 into the base 24, and after the assembly is completed, the upper cover 22 covers the opening and locks the seal, and the interior of the housing 20 That constitutes an airtight Dust chamber. In this embodiment, the height of the fluorescent wheel 36 is greater than the depth of the internal space of the base, and a portion of the fluorescent wheel 36 is exposed from the opening 26, and the fluorescent wheel 36 is covered by the correspondingly shaped upper cover 22. 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 explained as follows.

As shown in FIG. 2, in the embodiment, the upper cover 22 is provided with a heat sink group in the circumferential direction of the fluorescent wheel 36 or the inner surface IS and the outer surface OS in the horizontal direction of the light receiving surface 36a, and corresponds to the fluorescent wheel 36. A heat sink group is also provided in the circumferential direction or the inner surface IS of the susceptor 24 and the outer surface OS at the horizontal direction of the light receiving surface 36a.

The heat sink assembly can include a variety of different shapes of heat dissipation structures. In the embodiment, the heat sink group is a heat sink fin set 28 . The heat sink fin set 28 includes a plurality of heat dissipating fins 28a that are regularly arranged and extend toward the inside and outside of the outer casing 20. However, the heat dissipation fin group 28 may also be composed of a plurality of heat dissipation fins which are irregularly arranged and have different shapes or arrangements or different extension directions. In this embodiment, a first-class track C can be formed between two adjacent heat-dissipating fins 28a. In the present embodiment, the outer surface OS of the upper cover 22 and the susceptor 24 is provided with a heat dissipation fin set 28 respectively corresponding to the circumferential direction of the fluorescent wheel 36 or the opposite sides of the horizontal direction of the light receiving surface 36a. Alternatively, the outer casing 20 is provided with a heat dissipating fin set on the outer surface and the inner surface of the two corresponding positions corresponding to the periphery of the fluorescent wheel. As shown in the figure, the two corresponding positions are upper and lower sides. Additionally, a first blower 52 can be disposed within the outer casing 20 to drive air within the outer casing 20. Referring to FIG. 1 and FIG. 2 simultaneously, the first fan 52 can ventilate the fluorescent wheel 36 in an air direction P, for example, the wind can be emitted toward the spot S formed by the illumination beam on the fluorescent wheel 36, and the wind direction P It may be interlaced with the light receiving surface 36a of the fluorescent wheel 36 at an angle θ, and the angle θ may be, for example, between 20 degrees and 70 degrees, but is not limited. As shown in FIG. 1 , the second fan 54 can be disposed outside the outer casing 20 , and the second fan 54 can output a cooling wind that blows toward the outer casing 20 . In this embodiment, the second fan 54 can vent the outer casing 20 in an air direction Q, and the wind direction Q can be substantially parallel to the normal vector direction N of the light receiving surface 36a.

According to the design of the above embodiment, the internal fan disposed in the outer casing can directly lead to the convection circulation inside the outer casing, accelerate the flow velocity of the air around the fluorescent wheel, and improve the heat dissipation efficiency, and the inner and outer surfaces of the outer casing are provided with heat dissipation fins. Increasing the heat dissipation surface area can further improve the heat dissipation effect when the forced convection inside the casing is matched with a large heat dissipation surface area. On the other hand, the internal fan can directly optimize the heat dissipation design of the hot zone of the fluorescent wheel (such as the spot position), for example, the direction of the wind can be adjusted, the angle is blown to the hot zone at the maximum wind speed, or the direction of the fins can be visible. And the distribution adjusts the wind direction and angle to change the internal flow field, which can further improve the effect of the fluorescent wheel in the cooling casing. Furthermore, the external fan can output a cooling wind blown to the outer casing to cause convection circulation outside the outer casing, because the outer surface of the outer casing is provided with heat dissipating fins to increase the heat dissipating surface area, and forced convection outside the outer casing acts on the increased heat dissipation. The surface area can further improve the heat dissipation effect. In addition, in an embodiment, if an internal fan blown to the fluorescent wheel and an external fan blown to the outer casing are simultaneously disposed, the inner and outer convection cycles are simultaneously performed by the outer casing, and the heat radiating fin set disposed on the inner and outer surfaces of the outer casing is further disposed. Can further improve the heat dissipation effect.

The manner in which the heat dissipation fins 28a are disposed on the inner and outer surfaces of the upper cover 22 and the base 24 of FIG. 2 is merely an example, which may vary depending on actual heat dissipation requirements, component placement positions, and the like; for example, only the upper cover 22 and The outer surface of the base 24 or the inner surface of the upper cover 22 and the base 24 is provided with the heat dissipation fins 28a, or the heat dissipation fins 28a may be disposed only on the outer surface of the upper cover 22 and the inner surface of the base 24 without limited.

FIG. 3 is a schematic view showing the relative position of the second fan 54 and the outer casing 20 according to an embodiment of the present invention. In an embodiment, the air outlet 54a of the second fan 54 may be disposed to cover the upper cover 22 The heat sink fins 28 of the pedestal 24, that is, the air outlets 54a, can form a substantially superposed relationship with the heat sink fins 28, so that the air volume of the fan 54 can be utilized more efficiently. In addition, as shown in FIG. 4, in an embodiment, a plurality of flow channels C may be formed between the heat dissipation fins 28a in the heat dissipation fin group 28, and the second fan 54 may wind out the outer casing 20 along an airflow direction Q. The wind direction Q can be substantially parallel to the extending direction L of the plurality of flow channels C, thereby reducing wind resistance and improving heat dissipation efficiency.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and anyone skilled in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of protection is subject to the definition of the scope of the patent application. In addition, any embodiment or application of the present invention is not required to achieve all of the objects or advantages or features disclosed in the present disclosure.

Claims (10)

An optical system comprising: a light source for outputting an illumination beam; an outer casing provided with an upper cover and a base; the inner and outer surfaces of the upper cover and the inner and outer surfaces of the base are respectively provided with a heat dissipation fin set; a fluorescent wheel is disposed between the upper cover and the base, the fluorescent wheel has a light receiving surface to receive the illumination beam, and a fan disposed in the casing to drive air in the casing. The optical system of claim 1, wherein the fan faces the fluorescent wheel in a first air blowing direction, the first air blowing direction is interlaced with the light receiving surface at an angle, and the angle is between Between 20 and 70 degrees. The optical system of claim 1, wherein the upper cover and the outer surface of the base are respectively disposed at two corresponding positions corresponding to the periphery of the fluorescent wheel, and the heat dissipating fin set is disposed in the outer casing. The fan is a first fan, and the optical system further includes a second fan disposed outside the outer casing. An optical system comprising: a light source for outputting an illumination beam; a fluorescent wheel having a light receiving surface disposed on the illumination beam path; a casing disposed outside the fluorescent wheel, the casing being opposite to the periphery of the fluorescent wheel The outer surface and the inner surface of the corresponding position are respectively provided with a heat sink group; a first fan is disposed in the outer casing; and a second fan is disposed outside the outer casing. The optical system of claim 4, wherein the outer casing has an upper cover and a base, the upper cover and the base are connected to each other and a dustproof cavity is formed inside the outer casing, and the heat sink group includes a heat dissipation fin. A chip set, the heat sink fin set includes at least one heat sink fin. The optical system of claim 1 or 5, wherein the base has an opening, the fluorescent wheel is exposed from the opening, and the upper cover covers the opening. The optical system of claim 3, wherein the second fan blows air to the outer casing along a second air blowing direction, and the second air blowing direction is substantially parallel to a normal vector direction of the light receiving surface. . The optical system of claim 3, wherein the second fan blows air to the outer casing along a second air outlet direction, and the heat dissipation fins disposed on the outer cover or the outer portion of the base The inside includes a first-class track, and the second air-discharging direction is substantially parallel to the extending direction of the plurality of flow channels. The optical system of claim 3, wherein the light source comprises a laser diode lighting module, and the upper cover is respectively disposed on inner and outer surfaces of the two sides of the fluorescent wheel. a heat dissipating fin set; the base is respectively provided with a heat dissipating fin set on the inner and outer surfaces of the two sides of the fluorescent wheel; the first fan winds the fluorescent wheel along a first air blowing direction, The first air outlet direction is intersected with the light receiving surface at an angle, and the angle is between 20 degrees and 70 degrees; the air outlet of the second fan simultaneously covers the heat dissipation fin set of the outer cover of the upper cover and a heat dissipating fin set disposed outside the pedestal, the second fan vents the outer casing along a second air blowing direction, and the second air blowing direction is substantially parallel to a normal vector direction of the light receiving surface, and the The heat dissipating fin set on the outer side of the upper cover and the heat dissipating fin set on the outer side of the base have respectively a first-class track, and the second air blowing direction is substantially parallel to the extending direction of the flow channels, The first fan is a blower and the second fan is a fan. A projector comprising: the optical system according to any one of claims 1 to 5; a light valve that converts the illumination beam into an image beam; and a projection lens that receives and adjusts the image beam After the output.