JP2016051073A - Light source device and projector including light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device capable of efficiently cooling a phosphor wheel, and reducing a size, and suppressing an increase in manufacturing costs due to an increase in the number of components and a projector including the light source device capable of reducing a size, and suppressing an increase in manufacturing costs.SOLUTION: There is provided a light source device 2 including: at least one semiconductor laser 12; a cooling device 50 of the semiconductor laser 12 including a plurality of fins 52; and a phosphor wheel 30 to which light from the semiconductor laser 12 is made incident, in which a part of the phosphor wheel 30 is arranged between the fin 52 and fin 52 of the cooling device 50 of the semiconductor laser 12. There is provided a projector including the light source device 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light source device and a projector including the light source device.

  2. Description of the Related Art In recent years, time division projectors that take out light of a plurality of wavelengths in a time division manner and form and project an image by sequentially modulating the extracted light of the plurality of wavelengths have become widespread. As a light source device used for such a time-division projector, for example, a light source that outputs white light and a rotating wheel to which a plurality of color filters are attached are used to convert white light emitted from the light source at a constant speed. The light is made incident on a rotating wheel that rotates in order to extract light of a plurality of wavelengths (for example, blue, green, and red light) in a time-sharing manner.

  In addition, a light source that outputs light of a single wavelength, such as a semiconductor laser, uses a rotating wheel having a phosphor layer (hereinafter referred to as a “fluorescent wheel”) instead of a color filter. There has also been proposed a light source device that takes out light of a plurality of wavelengths in a time-sharing manner by making emitted single-wavelength light incident. In the light source device having this phosphor wheel, when the output of light irradiated to the phosphor is increased in order to obtain a high output, the amount of heat generated by the phosphor increases and the phosphor becomes high temperature. The problem that conversion efficiency falls occurs.

  In order to deal with such problems, a light source device that uses a cooling fan to cool the phosphor on the phosphor wheel by applying a cooling medium (such as air) from an oblique direction toward the unevenness is proposed. (For example, refer to Patent Document 1). A light source device has also been proposed in which a phosphor wheel and a blower that blows air to the phosphor wheel are housed in a case to improve cooling efficiency (see, for example, Patent Document 2).

JP 2012-78707 A JP 2014-92599 A

In the light source device disclosed in Patent Document 1, since a cooling means dedicated to the phosphor wheel is required in addition to the light source cooling means, it is difficult to reduce the size of the light source device, and the manufacturing cost increases due to an increase in the number of parts.
In the light source device disclosed in Patent Document 2, a fan dedicated to the phosphor wheel is required in addition to the light source cooling means, and a case for housing the fluorescent pair wheel and the fan is required. Therefore, it is difficult to reduce the size of the light source device. Therefore, the manufacturing cost increases due to the increase in the number of parts.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, and while being able to efficiently cool the phosphor wheel, it is possible to reduce the size and suppress the increase in manufacturing cost due to the increase in the number of parts. It is an object of the present invention to provide an apparatus and a projector including the light source device that can be reduced in size and can suppress an increase in manufacturing cost.

In order to solve the above problems, in one embodiment of the light source device according to the present invention,
At least one semiconductor laser;
A semiconductor laser cooling device provided with a plurality of fins;
A phosphor wheel on which light from the semiconductor laser is incident;
With
A part of the phosphor wheel is disposed between the fins of the cooling device for the semiconductor laser.

In one embodiment of the projector according to the present invention, the light source device of the above embodiment,
A light modulation unit that sequentially modulates light of a plurality of wavelength bands emitted from the light source device to form an image based on image data;
Projection means for enlarging and projecting the image;
It has.

  As described above, in the embodiment of the present invention, the light source device that can efficiently cool the phosphor wheel, can be downsized, and can suppress an increase in manufacturing cost due to an increase in the number of components, and the light source. It is possible to provide a projector that can be miniaturized and that can suppress an increase in manufacturing cost.

It is a perspective view which shows one Embodiment of the light source device of this invention. It is the side view of the light source device seen from the arrow AA of (a) which removed the fan from the light source device shown in FIG. 1, and (a). It is a top view which shows typically 2nd Embodiment regarding the cooling mechanism of the fluorescent substance wheel of the light source device of this invention. It is a top view which shows typically 3rd Embodiment regarding the cooling mechanism of the fluorescent substance wheel of the light source device of this invention. It is a top view which shows typically 4th Embodiment regarding the cooling mechanism of the fluorescent substance wheel of the light source device of this invention. It is a top view which shows typically the modification of 4th Embodiment regarding the cooling mechanism of the fluorescent substance wheel of the light source device of this invention. It is a top view which shows typically 5th Embodiment regarding the cooling mechanism of the fluorescent substance wheel of the light source device of this invention. It is a schematic diagram which shows one Embodiment of the fluorescent wheel of the light source device of this invention. It is a schematic diagram which shows the structure of the projector provided with the light source device of this invention.

  Embodiment 1 of the light source device according to the present invention includes at least one semiconductor laser, the semiconductor laser cooling device provided with a plurality of fins, and a phosphor wheel on which light from the semiconductor laser is incident. A part of the phosphor wheel is disposed between the fins of the semiconductor laser cooling device.

  According to this embodiment, since a part of the phosphor wheel is disposed between the fins of the semiconductor laser cooling device, the phosphor wheel heated to high temperature by irradiation from the semiconductor laser is The cooling medium flow path formed between the fins allows efficient cooling. Furthermore, since the phosphor wheel is cooled using a semiconductor laser cooling device, an increase in the number of components can be suppressed, and a light source device that can be reduced in size and manufactured at a low cost can be provided.

  In the second embodiment of the light source device according to the present invention, the fin of the cooling device for the semiconductor laser is provided in a region other than the optical path of the light from the semiconductor laser in the first embodiment.

  According to this embodiment, since the fin of the semiconductor laser cooling device is provided in a region other than the optical path of the light from the semiconductor laser, the semiconductor laser and the phosphor can be cooled without impairing the performance as the light source device. Can be performed efficiently.

  In Embodiment 3 of the light source device according to the present invention, in the above Embodiment 1 or 2, the cooling device includes a fan for creating a flow of the cooling medium along the fins.

  According to this embodiment, since the flow of the cooling medium along the fins is created by the fan, the flow rate of the cooling medium formed between the fins is increased, and the phosphor wheel is cooled more efficiently. be able to.

  In Embodiment 4 of the light source device according to the present invention, in any of Embodiments 1 to 3, a part of the fins in the region where the phosphor wheel is arranged is cut out.

  According to this embodiment, a part of the fin in the region where the phosphor wheel is disposed is cut away, so that a part of the phosphor wheel is easily disposed between the fin and the fin. Become. Therefore, the phosphor wheel can be efficiently cooled without increasing the number of parts.

  Embodiment 5 of the light source device according to the present invention includes a plate-like member that closes both ends of the plurality of fins in the embodiment 4, and the plate-like member is where the fins are notched. It is blocking.

  According to this embodiment, the plate-like member that closes both ends of the plurality of fins closes the portions where the fins are cut out, so that the cooling medium does not escape from both ends of the fins. Therefore, the phosphor wheel can be cooled by using the flow path of the cooling medium formed between the fins more efficiently.

  In Embodiment 6 of the light source device according to the present invention, in any of the above Embodiments 1 to 3, some of the fins in the region where the phosphor wheel is disposed are other fins. It is formed to extend beyond the fins in the region.

  According to this embodiment, some of the fins in the region where the phosphor wheel is disposed are formed to extend toward the rotation center side of the phosphor wheel relative to the fins in the other region. A part of the wheel is easily arranged between the fins. Therefore, the phosphor wheel can be efficiently cooled without increasing the number of parts.

  In Embodiment 7 of the light source device according to the present invention, in any one of Embodiments 1 to 6, the support member of the drive motor that drives the phosphor wheel is provided with a second plurality of fins.

  Since the drive motor that drives the phosphor wheel also generates heat, it becomes one of the factors that raise the temperature of the phosphor wheel connected through the rotating shaft. Therefore, according to the present embodiment, since the second plurality of fins are provided on the support member of the drive motor that drives the phosphor wheel, the second plurality of fins are used in addition to the cooling fins described above. The phosphor wheel connected through the drive motor and the rotating shaft can be cooled. Therefore, the phosphor wheel can be further efficiently cooled.

In Embodiment 8 of the light source device according to the present invention, in any one of Embodiments 1 to 7, the second plurality of fins are arranged so as to surround the drive motor.
According to this embodiment, since the second plurality of fins are arranged so as to surround the drive motor, the area of the cooling surface of the fin is increased, and the phosphors connected via the drive motor and the rotation shaft The wheel can be cooled more efficiently.

  In the first embodiment of the projector according to the present invention, light in a plurality of wavelength bands emitted from the light source device according to any one of the above embodiments 1 to 8 and the light source device based on image data. Light modulation means for sequentially modulating the image to form an image, and projection means for enlarging and projecting the image.

According to this embodiment, the phosphor wheel can be efficiently cooled, and the light source device that can be reduced in size and can suppress an increase in manufacturing cost due to an increase in the number of parts is provided. A projector capable of suppressing an increase in cost can be provided.
Next, a light source device according to an embodiment of the present invention and a projector including the light source device will be described in detail with reference to the drawings.

(Description of the outline of the light source device)
First, an outline of an embodiment of a light source device according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing one embodiment of the light source device of the present invention. 2A is a plan view of the light source device shown in FIG. 1 excluding the fan of the cooling device, and FIG. 2B is a light source device seen from the arrow AA in FIG. FIG.
As shown in FIG. 1, the light source device 2 of the present embodiment includes a light source unit 10 including a plurality of semiconductor lasers 12, a condensing lens 20, a fluorescent plate wheel 30, a drive motor 40 that rotates the fluorescent plate wheel, a cooling device 50, and A light receiving lens 70 is provided.

First, an outline of the light source device will be described along the flow of light emitted from the light source unit 10. In the present embodiment, light of a predetermined wavelength band (here, blue light will be described as an example) is emitted from the semiconductor laser housing 12 placed on the housing of the light source unit 10, and the emitted light is collected. The light enters the optical lens 20, is collected by the condenser lens 20, and enters the fluorescent plate wheel 30 that is rotated by the drive motor 40. The fluorescent plate wheel 30 is made of a material that transmits light, the dielectric film regions 31G, R, and B (see FIG. 8) on the incident side surface, and the phosphor regions 32G, R and the blue transmission region 32B (see FIG. 8) on the outgoing side surface. Are formed concentrically. The green phosphor emits green light when blue light is incident, and the red phosphor emits red light when blue light is incident. Therefore, when blue light enters the fluorescent plate wheel 30 from the condenser lens 20, green light, red light, and blue light are emitted from the fluorescent plate wheel 30 in a time-sharing manner and enter the light receiving lens 60. Then, the light is collected by the light receiving lens 70 and emitted from the light source device 2.
When the semiconductor laser 12 emits blue light, the wavelength is preferably emitted within a range of 370 to 500 nm, and more preferably within a range of 420 to 500 nm.

Here, FIG. 8 shows a schematic diagram of an embodiment of the phosphor wheel 30. FIG. 8A shows the incident side of the phosphor wheel 30, and FIG. 8B shows the emission side of the phosphor wheel 30. The phosphor wheel 30 is provided with a green phosphor region 32G, a red phosphor region 32R, and a blue transmission region 32B. The green phosphor region 32G on the emission side of the substrate of the phosphor wheel 30 is coated with a phosphor having a green wavelength band, and blue light is applied to the incident side of the substrate corresponding to the green phosphor region 32G. A dielectric film region 31G having a dielectric film that transmits green light and reflects green light is formed. Similarly, a phosphor having a red wavelength band is applied to the red phosphor region 32R on the emission side of the substrate, and blue light is transmitted to the incident side of the substrate corresponding to the red phosphor region 32R. A dielectric film region 31R having a dielectric film that reflects red light is formed. The phosphor is not applied to the blue transmission region 32B on the emission side of the substrate, and the dielectric film region 31B having a dielectric film that transmits blue light on the incident side of the substrate corresponding to the blue transmission region 32B. Is formed. A dielectric film that transmits blue light similar to that on the incident side may be formed in the blue transmission region 32B on the emission side of the substrate. Further, in order to improve luminance unevenness and chromaticity unevenness, it is desirable to apply scatterers, for example, particles such as SiO ₂ , TiO ₂ , and Ba ₂ So ₄ .

The dielectric film formed in the green and red phosphor regions 31G and R of the phosphor wheel 30 is a film that transmits blue light and reflects a wavelength corresponding to the color of each region. Light (green light, red light) emitted from the green and red phosphor regions 32G and R phosphor to the semiconductor laser 12 side can be reflected to the light receiving lens 70 side, thereby efficiently converting the wavelength by the phosphor. Light (green light, red light) can be used.

The phosphor applied to the green phosphor region 32G of the phosphor wheel 30 desirably generates green fluorescence including a wavelength band of about 500 to 560 nm. An example of a specific _{material, β-Si 6-Z Al} Z O Z N 8-Z: Eu, Lu 3 Al 5 O 12: Ce, Ca 8 MgSi 4 O 16 C l2: Eu, Ba 3 Si 6 O ₁₂ N ₂ : Eu, (Sr, Ba, Ca) Si ₂ O ₂ N ₂ : Eu, and the like can be given.

The phosphor applied to the red phosphor region 32R of the phosphor wheel 30 desirably generates a red tendency in which the wavelength band includes 600 to 800 nm. Specific examples of the material include (Sr, Ca) AlSiN ₃ : Eu, CaAlSiN ₃ : Eu, SrAlSiN ₃ : Eu, and K ₂ SiF ₆ : Mn.

The ratios of the green / red phosphor regions 32G and R and the blue transmission region 32B in the phosphor wheel 30 can be arbitrarily determined. For example, it can be calculated from the white chromaticity required for the projector and the efficiency of each phosphor. Here, the green and red phosphor regions green 32G and R are each 150 degrees, and the blue transmission region 32B is 60 degrees.
In the present embodiment, three regions of green, red, and blue are used, but four or more regions may be used. It is also possible to increase the white light area by blue and yellow and the green, red, and blue areas, respectively.

The phosphor wheel 30 is made of a transparent disk-shaped member that transmits light, and the center thereof is fixed to the drive shaft 40 a of the drive body 40. Here, glass, resin, sapphire, or the like can be used as the material of the phosphor wheel 30 as long as the material has high light transmittance.
Note that one more substrate may be added to the emission side of the phosphor wheel 30 and a band pass filter may be provided there (not shown). By doing so, purer green and red can be obtained.

Returning to the description of FIG. 1, the drive motor 40 is attached to a support member 42 installed on the base of the light source device 2.
The drive motor 40 is a brushless DC drive motor, and is arranged so that the rotation shaft 40a and the optical axis of the condenser lens 20 are parallel to each other. Further, the surface of the phosphor wheel 30 is fixed so as to be perpendicular to the rotation shaft 40a. The rotation speed of the drive motor 40 is a rotation speed based on the frame rate of the moving image to be reproduced (the number of frames per second. The unit is [fps]). For example, when a moving image of 60 [fps] can be reproduced, the rotational speed of the drive motor 40 (that is, the phosphor wheel 30) is preferably set to an integral multiple of 60 revolutions per second.

(Description of cooling device)
Next, the cooling device 50 will be described with reference to FIGS. Since the light source unit 10 becomes high temperature due to the heat generated by the semiconductor laser 12, the light source device 2 is provided with a cooling device 50 for cooling the semiconductor laser 12. The cooling device 50 includes a heat pipe (pipe-shaped heat sink) 56 connected to the base plate 12 of the light source unit 10 and a plurality of fins 52 for cooling the heat pipe 56. The heat pipe 56 is in contact with the base plate 12 of the light source unit 10 and has a cooling region for cooling the semiconductor laser 12 and a portion to be cooled that is inserted between the plurality of fins 52 and cooled. The cooling medium enclosed in the heat pipe 56 is vaporized by removing heat from the semiconductor laser 12 in the cooling region, condensed by cooling by the fins 52 in the cooled region, and repeating this cycle to It can be continuously cooled.

  In the cooling by the plurality of fins 52, the space between the plurality of fins 52 from the side (left side in the plan view of FIG. 2) where the cooling medium (for example, air) is provided by the suction type fan 54. And the heat pipe 56 can be cooled by forced convection cooling. In particular, since both ends of the plurality of fins 52 (upper and lower ends of the fins 52 in the side view of FIG. 2B) are blocked by the plate-like member 58, the cooling medium does not escape from both ends of the fins 52. And the flow path of the cooling medium formed between the fin 52 and the fin 52 can be used more efficiently. Note that the side view of FIG. 2B shows a structure in which the heat pipe 56 is cooled by a plurality of fins 52.

(Description of First Embodiment Regarding Phosphor Wheel Cooling Mechanism of Light Source Device of the Present Invention)
In light source devices having a phosphor wheel, in recent years, in order to obtain high output, there is a tendency to increase the output of light emitted from a semiconductor laser to the phosphor, and accordingly, the amount of heat generated not only by the semiconductor laser but also by the phosphor increases. As a result, the phosphor tends to have a higher temperature. For this reason, the problem that the conversion efficiency of fluorescent substance falls arises. In order to cope with this, it is conceivable to cool the phosphor wheel. However, in addition to the cooling device for the semiconductor laser, which originally has a high temperature, a cooling device for cooling the phosphor wheel is provided. This increases the manufacturing cost and makes it difficult to reduce the size of the light source device.

Therefore, in order to cope with this, in the first embodiment relating to the cooling mechanism of the phosphor wheel of the light source device of the present invention, the cooling device 50 for cooling the semiconductor laser 12 of the light source unit 10 is used. The phosphor wheel 30 is cooled. More specifically, a part of the phosphor wheel 30 is disposed between the fin 52 and the fin 52 of the cooling device 50 of the semiconductor laser 12 (see, for example, FIGS. 1, 3, and 4).
The distance between the phosphor wheel 30 and the adjacent fin 52 needs to have a clearance that does not come into contact with the fin 52 even if some vibration occurs during the rotation of the phosphor wheel 30. The narrower one within the range can increase the flow rate of the cooling medium by the suction of the fan 54. Therefore, the cooling efficiency of the phosphor wheel 30 can be increased.
As a part of the phosphor wheel 30 disposed between the fins 52 and 52, a region where the phosphors 32G and 32R are applied (see FIG. 8B) can be exemplified. It is not limited. It can be arbitrarily determined according to the dimensions of the fins 52, the drive motor 40, the support member 42 of the drive motor 40, and the like.

  That is, since a part of the phosphor wheel 30 is disposed between the fin 52 and the fin 52 of the cooling device 50 of the semiconductor laser 12, the phosphor wheel 30 that has become high temperature due to irradiation from the semiconductor laser 12 is Cooling can be efficiently performed by the flow path of the cooling medium (for example, air) formed between the fins 52. Furthermore, since the phosphor wheel 30 is cooled using the cooling device 50 for the semiconductor laser 12, it is possible to provide a light source device 2 that can be miniaturized at a low manufacturing cost while suppressing an increase in the number of components.

  1 and 2, the fin 52 of the cooling device 50 for the semiconductor laser 12 is provided in a region other than the optical path of the light from the semiconductor laser 12, so that the performance as the light source device 2 is improved. The semiconductor laser 12 and the phosphor wheel 30 can be efficiently cooled without loss.

  In addition, since the flow of the cooling medium (for example, air) along the fins 52 is created by the fan 54 for cooling the heat pipe 56 that cools the semiconductor laser 12, the cooling medium formed between the fins As a result, the phosphor wheel 30 can be cooled more efficiently. That is, the heat transfer coefficient of forced convection heat transfer can be increased. Here, the interval between the fins is preferably larger than 0.8 mm and smaller than 10 mm. A plurality of fins can be easily formed by being larger than 0.8 mm, and cooling is efficiently performed by being smaller than 10 mm. As a preferable example in the case where the wheel 30 is formed between the fins 52 by cutting out as shown in FIGS. 1 and 2, the distance between the fins in the region where the wheel 30 is formed is 5. The distance between the fins in the other area is 4 mm, and 4 mm.

(Description of Second Embodiment Regarding Cooling Mechanism of Phosphor Wheel of Light Source Device of the Present Invention)
The structure in which a part of the phosphor wheel 30 is disposed between the fins 52 of the cooling device 50 of the semiconductor laser 12 will be described in more detail. First, 2nd Embodiment regarding the cooling mechanism of the fluorescent substance wheel of the light source device of this invention is described using FIGS. 1-3. FIG. 3 is a plan view schematically showing a second embodiment relating to the cooling mechanism of the phosphor wheel of the light source device of the present invention. FIG. 3A is a schematic plan view for clearly showing the positional relationship between the phosphor wheel 30 and the fin 52, and the plate-like member 58 that closes the upper and lower ends of the fin 52 is not drawn. FIG. 3B is a plan view of the light source device 2 on which the plate-like member 58 is drawn as viewed from above. As is clear from FIGS. 1 and 3, particularly FIG. 3, in this embodiment, a part of the fins 52 in the region where the phosphor wheel 30 is disposed is cut away. The number of fins 52 to be cut out is appropriately determined according to the pitch at which the plurality of fins 52 are arranged and the thickness of the phosphor wheel 30. The distance between the phosphor wheel 30 and the adjacent semiconductor laser 12 needs to have a clearance that does not come into contact with the fins 52 even if some fluctuation occurs during the rotation of the phosphor wheel 30. The narrower one within the range can increase the flow rate of the cooling medium by the suction of the fan 54. Therefore, the cooling efficiency of the phosphor wheel 30 can be increased.

  With the configuration as described above, a part of the phosphor wheel 30 is easily disposed between the fins 52. Therefore, the phosphor wheel 30 can be efficiently cooled without increasing the number of parts. In particular, since the phosphor wheel 30 and the fins 52 can be disposed close to each other, the light source device 2 can be reduced in size.

  As described above, the cooling device 50 includes the plate-like members 58 that block both ends of the plurality of fins 52 (upper and lower ends of the fins 52 in the side view of FIG. 2B). As shown in the plan view of b), the plate-like member 58 blocks both ends of the fin 52 even in the region where the fin 52 is cut out. In FIG. 1, the plate-like member 58 is also cut out in the region where the fin 52 is cut out, but this is to show the region in which the fin 52 is cut out. As shown in FIG. 2, the plate-like member 58 exists continuously without being cut out.

  Therefore, the plate member 58 that closes both ends of the plurality of fins 52 closes the portions where the fins 52 are cut out, so that the cooling medium (for example, air) does not escape from both ends of the fins 52, The phosphor wheel 30 can be cooled by more efficiently using the flow path of the cooling medium formed between the 52 and the fins 52.

  However, the present invention is not limited to this, and as shown in FIG. 3C, there may be a structure in which the plate-like member 58 is similarly cut out in the region where the fin 52 is cut out. In this case, the phosphor wheel 30 can be easily attached and detached, and the light source device 2 having excellent maintainability can be provided. Further, the portion of the plate-like member 58 corresponding to the region where the fins 52 are cut out is formed so as to be openable and closable, and normally the cooling medium (for example, air) is prevented from escaping from both ends of the fins 52. In addition, the light source device 2 having excellent maintainability can also be provided.

(Description of Third Embodiment Regarding Phosphor Wheel Cooling Mechanism of Light Source Device of the Present Invention)
Next, a third embodiment relating to the cooling mechanism of the phosphor wheel of the light source device of the present invention will be described with reference to FIG. FIG. 4 is a plan view schematically showing a third embodiment relating to the cooling mechanism of the phosphor wheel of the light source device of the present invention. FIG. 4A is a schematic plan view for clearly showing the positional relationship between the phosphor wheel 30 and the fins 52 of the third embodiment. As in FIG. The plate-like member 58 that closes the upper and lower ends is not drawn. 4B and 4C are plan views of the light source device 2 on which the plate-like member 58 is drawn as seen from above.

As is clear from FIG. 4, in the present embodiment, among the plurality of fins 52, some of the fins 52 in the region where the phosphor wheel 30 is arranged are phosphor wheels 30 than the fins 52 in other regions. Is formed to extend toward the rotation shaft 40a (that is, the rotation center).
In FIG. 4, the number of fins 52 formed to extend toward the rotating shaft 40 a (that is, the rotation center) is one on both sides of the phosphor wheel 30, but a plurality of fins 52 are extended on both sides of the phosphor wheel 30. It can also be formed.
The distance between the phosphor wheel 30 and the adjacent semiconductor laser 12 needs to have a clearance that does not come into contact with the fins 52 even if some fluctuation occurs during the rotation of the phosphor wheel 30. The narrower one within the range can increase the flow rate of the cooling medium by the suction of the fan 54. Therefore, the cooling efficiency of the phosphor wheel 30 can be increased.
Note that the thickness of these fins 52 is set so that the fins 52 extending toward the rotating shaft 40a (that is, the rotation center) do not flutter due to the flow of the cooling medium by the suction of the fan 54. It is also conceivable to increase the strength by increasing the thickness. This is advantageous for preventing damage during maintenance.

  With the configuration as described above, a part of the phosphor wheel 30 is easily disposed between the fins 52. Therefore, the phosphor wheel 30 can be efficiently cooled without increasing the number of parts.

  In the plate-like member 58 that closes the upper and lower ends of the fins 52, the plate-like member 58 is formed in a portion where some of the fins 52 are formed to extend from other regions as shown in FIG. 4 may not exist, and as shown in FIG. 4C, the plate-like member 58 may exist in a portion where some of the fins 52 are formed to extend from other regions. .

(Description of 4th Embodiment regarding the cooling mechanism of the fluorescent substance wheel of the light source device of this invention)
Next, 4th Embodiment regarding the cooling mechanism of the fluorescent substance wheel of the light source device of this invention is described using FIG. FIG. 5A is a schematic plan view for illustrating the outline of the second fin 62 provided around the drive motor 40 that is a characteristic part of the fourth embodiment, and FIG. These are the side views seen from arrow BB of Drawing 5 (a), and Drawing 5 (c) is a sectional view seen from arrow CC of Drawing 5 (a).
Since the drive motor 40 that drives the phosphor wheel 30 also generates heat, it becomes one of the factors that raise the temperature of the phosphor wheel 30 connected via the rotating shaft 40a. Thus, according to the fourth embodiment, the second plurality of fins 62 are provided on the support member 42 of the drive motor 40 that drives the phosphor wheel 30. The cooling means constituted by the second plurality of fins 62 is referred to as a second cooling device 60.

  The structure of the second cooling device 60 will be described in more detail. Each fin 62 has a rectangular planar shape, and a circular hole slightly larger than the outer shape of the drive motor 40 is formed at the center. The drive motor 40 is inserted and disposed in this hole. Mounting holes are formed on both sides of the circular hole for the drive motor 40 of the fin 62, and two support rods 64 protruding from the support member 40 of the drive motor 40 are inserted into the holes. Each fin 62 and the support bar 64 are fixed. In addition, the fixation between the hole for attaching the fin 62 and the support rod 64 can be performed by any method including fitting of a tightening spring and welding. According to this structure, the support rod 64 does not disturb the flow of the cooling medium flowing between the fins 62. The structure shown in FIG. 5 is merely an example, and any other structure can be used as a structure in which a plurality of second fins 62 are provided around the drive motor 40. In this case, in order to effectively use the flow of the cooling medium by the fan 54, the direction in which the second fins 62 are arranged is preferably parallel to the fins 52 of the cooling device 50. Also, the pitch at which the second fins 62 are arranged is preferably the same as that of the fins 52 of the cooling device 50 or an integral multiple or a fraction thereof.

  In FIG. 5, in the cooling device 50, a part of the fins 52 is formed so as to extend to the rotation axis 40a (that is, the rotation center) side of the phosphor wheel 30 with respect to the fins 52 of other regions. Although it is shown in the same shape as the embodiment, the present invention is not limited to this, and the cooling device 50 of the arbitrary embodiment and the second cooling device 60 can be combined.

  With the configuration as described above, in addition to cooling by the plurality of cooling fins 52 of the cooling device 50 that cools the semiconductor laser 12, the drive motor is driven by the second plurality of fins 62 provided on the support member 42 of the drive motor 40. The phosphor wheel 30 connected via the rotary shaft 40a and the rotary shaft 40a can be cooled. Therefore, the phosphor wheel 30 can be cooled more efficiently.

  Further, as apparent from FIG. 5, in the fourth embodiment, the second plurality of fins 62 are arranged so as to surround the drive motor 40. Therefore, the area of the cooling surface of the fin can be increased, and the phosphor wheel connected via the drive motor and the rotating shaft can be cooled more efficiently.

(Description of Modification of Embodiment Regarding Cooling Mechanism of Fourth Phosphor Wheel of Light Source Device of Present Invention)
In the fourth embodiment relating to the phosphor wheel cooling mechanism described above, the plurality of cooling fins 52 of the cooling device 50 that cools the semiconductor laser 12 and the second plurality of fins provided on the support member 42 of the drive motor 40. 62 is formed separately, but is not limited to this. For example, as shown in FIG. 6 which is a schematic plan view for clearly showing the positional relationship among the phosphor wheel 30, the drive motor 40, and the fins 52/62, the cooling fins 52 and the second plurality of fins 62 Can also be formed integrally. In this case, the fins around the drive motor 40 can be arranged without using the support rod 64 or the like as described above. Further, the phosphor wheel 30 and the drive motor 40 can be efficiently cooled by the fan 54.

(Description of 5th Embodiment regarding the cooling mechanism of the fluorescent substance wheel of the light source device of this invention)
In the above-described embodiment, the semiconductor laser 12 is cooled via the heat pipe 56 as the cooling device 50 that cools the semiconductor laser 12, but is not limited to this, for example, in the plan view of the light source device 2. As shown in FIG. 7, the semiconductor laser 12 can be cooled by a plurality of cooling fins 52 without using the heat pipe 56. In order to realize this, for example, the base plate 14 of the light source unit 10 to which the semiconductor laser 12 is attached is extended to the side of the light source unit 10 (the right side in FIG. 7), and a plurality of cooling is performed on the extended base plate 14. The structure which attaches the cooling device 50 comprised from the fin 52 can be considered. Also in this case, the phosphor wheel 30 can be efficiently cooled by disposing the phosphor wheel 30 between the plurality of cooling fins 52 that cool the semiconductor laser 12.

  As described above, according to the above-described embodiment, since a part of the phosphor wheel 30 is disposed between the fins 52 of the cooling device 50 of the semiconductor laser 12, the irradiation from the semiconductor laser 12 is performed. Thus, the phosphor wheel 30 having a higher temperature can be efficiently cooled by the flow path of the cooling medium formed between the fins 52. Furthermore, since the phosphor wheel 30 is cooled using the cooling device 50 for the semiconductor laser 12, it is possible to provide a light source device 2 that can be miniaturized at a low manufacturing cost while suppressing an increase in the number of components.

(Description of the projector of the present invention)
Next, the case where the light source device 2 shown in the above-described embodiment is used as a light source device in a so-called one-chip DLP projector will be described with reference to FIG. FIG. 9 is a schematic diagram showing a configuration of the projector 100 including the light source device 2 shown in the above embodiment.
In FIG. 9, light emitted from the light source device 2 is reflected by a DMD (Digital Micromirror Device) element 110 that is a spatial light modulator, condensed by a projection lens 120 that is a projection means, and projected onto a screen SC. The The DMD element is a matrix in which fine mirrors corresponding to each pixel of an image projected on a screen are arranged in a matrix, and the light emitted to the screen by changing the angle of each mirror is turned on / off in units of microseconds. Can be turned off.
In addition, by changing the gradation of light incident on the projection lens according to the ratio of the time when each mirror is turned on and the time when it is turned off, gradation display based on the image data of the image to be projected becomes possible. Become.

In the present embodiment, the DMD element is used as the light modulation means. However, the present invention is not limited to this, and any other light modulation element can be used depending on the application. In addition, the light source device 1 and the projector using the light source device 1 according to the present invention are not limited to the above-described embodiments, and various other embodiments are included in the present invention.
According to the present embodiment, the phosphor wheel 30 can be efficiently cooled, and the light source device 2 that can be reduced in size and can suppress an increase in manufacturing cost due to an increase in the number of parts is provided. Thus, it is possible to provide a projector capable of suppressing an increase in manufacturing cost.

  Although the embodiments of the present invention have been described, the disclosure may vary in the details of the configuration, and combinations of elements and changes in the order in the embodiments depart from the scope and spirit of the claimed invention. It can be realized without.

2 Light source device 10 Light source unit 12 Semiconductor laser 14 Base plate 20 Condensing lens 30 Phosphor wheel 31G, R, B Dielectric film region 32G, R Phosphor region 32B Blue transmission region 40 Drive motor 42 Support member 50 Cooling device 52 Fin 54 Fan 56 Heat pipe 58 Plate-like member 60 Second cooling device 62 Second fin 64 Support rod 70 Light receiving lens 100 Projector 110 DMD element 120 Projection lens SC Screen

Claims (9)

At least one semiconductor laser;
A semiconductor laser cooling device provided with a plurality of fins;
A phosphor wheel on which light from the semiconductor laser is incident;
With
A part of the phosphor wheel is disposed between the fins of the cooling device for the semiconductor laser.
The light source device according to claim 1, wherein the fin of the cooling device for the semiconductor laser is provided in a region other than an optical path of light from the semiconductor laser.
The light source device according to claim 1, wherein the cooling device includes a fan for creating a flow of a cooling medium along the fins.
4. The light source device according to claim 1, wherein a part of fins in a region where the phosphor wheel is disposed is cut out. 5.
5. The light source device according to claim 4, further comprising a plate-like member that closes both ends of the plurality of fins, wherein the plate-like member closes a place where the fin is cut out.
4. The fins according to claim 1, wherein some of the plurality of fins in a region where the phosphor wheel is disposed extend from fins in other regions. The light source device according to Item 1.
The light source device according to any one of claims 1 to 6, wherein a second plurality of fins are provided on a support member of a drive motor that drives the phosphor wheel.
The light source device according to claim 7, wherein the second plurality of fins are arranged so as to surround the drive motor.
A light source device according to any one of claims 1 to 8,
A light modulation unit that sequentially modulates light of a plurality of wavelength bands emitted from the light source device to form an image based on image data;
Projection means for enlarging and projecting the image;
With projector.

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