JP2016122149A - Light source device and projector with the light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device that is not easily influenced by heat generation of fluorescent material and can suppress decrease in light emission efficiency, and a projector using the light source device.SOLUTION: There are provided a light source device 2 and a projector using the light source device 2, the light source device 2 including a light source 10 and a disc-like fluorophor wheel 30 transmitting light from the light source 10, the fluorophor wheel 30 having fluorescent material 34, a filter 36 located further away from the light source 10 than from the fluorescent material 34, and a housing 38 with an inner wall 38A in contact with a side surface of the fluorescent material 34 and a side surface of the filter 36.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 recent years, a light source that outputs a single wavelength light such as a semiconductor laser is used instead of a conventional white light source. For example, a rotating wheel (phosphor wheel) having a phosphor instead of a color filter is used. In addition, a light source device that takes out light of a plurality of wavelengths in a time-division manner by making single-wavelength light emitted from a light source such as a semiconductor laser incident thereon has also become widespread. In such a light source device having a phosphor wheel, a light source device is proposed in which a wavelength selective film is formed on one surface of a disk-shaped substrate containing phosphor particles and an antireflection film is formed on the other surface. (See Patent Document 1).

JP2012-83695A

  In the light source device disclosed in Patent Document 1, the wavelength selection film formed on the light incident surface side from the light source prevents light in a wavelength region other than the light emitted from the light source from entering, and the opposite emission surface The antireflection film formed on the side can effectively emit light to the outside. These wavelength selective films and antireflection films are dielectric multilayer films formed by a vacuum process. However, since they are in close contact with the substrate containing the phosphor particles, they are easily affected by the heat generated by the phosphors. Deterioration may be accelerated. On the other hand, when the filter is formed of individual members such as filter glass, the influence of the heat generation of the phosphor can be reduced, but there is a risk of light leaking from the side surface of the filter, and further using an adhesive or the like. When the filter is bonded to the substrate, light loss occurs in the adhesive layer, which causes a problem that the light emission efficiency is lowered.

  Therefore, an object according to an embodiment of the present invention is to solve the above-described problem, to provide a light source device that is hardly affected by the heat generation of a phosphor and can suppress a decrease in luminous efficiency, As a result, it is providing the projector using this light source device.

  In order to solve the above-described problem, one of the light source devices according to an embodiment of the present invention includes a light source and a disk-shaped phosphor wheel that transmits light from the light source, and the phosphor wheel includes: A phosphor, a filter disposed at a position farther from the light source than the phosphor through a space, and a housing having a side surface of the phosphor and an inner wall in contact with the side surface of the filter.

  One projector according to an embodiment of the present invention forms an image by sequentially modulating light of a plurality of wavelength bands emitted from the light source device based on the light source device of the above embodiment and image data. Light modulation means and projection means for enlarging and projecting the image.

  As described above, according to the embodiments of the present invention, a light source device that is not easily affected by the heat generated by the phosphor and that can suppress a decrease in light emission efficiency is provided, and thus a projector using the light source device is provided. can do.

It is the (a) perspective view and (b) side view which show typically the light source device of one Embodiment of this invention. The light source device of other embodiment of this invention is shown typically, (a) is a perspective view, (b) is sectional drawing in the AA cross section of (a). It is a schematic diagram which shows other embodiment (phosphor wheel which does not have a board | substrate) of the light source device of other embodiment of this invention, especially a phosphor wheel. It is a schematic diagram which shows the light source device of other embodiment of this invention, especially other embodiment (phosphor wheel which does not have a space between a fluorescent substance and a filter) of a phosphor wheel. Light source device according to another embodiment of the present invention, in particular, another embodiment of the phosphor wheel (a phosphor wheel provided with a convex portion for determining the position when there is a space between the phosphor and the filter) It is a schematic diagram which shows. Light source device according to another embodiment of the present invention, particularly another embodiment of a phosphor wheel (fluorescent pair wheel provided with a convex portion for determining a position when there is no space between the phosphor and the filter) It is a schematic diagram which shows. It is a schematic diagram which shows other embodiment (The phosphor wheel whose diameter of a filter is below the diameter of a fluorescent substance) of the light source device of other embodiment of this invention, especially a fluorescent substance wheel. It is a schematic diagram which shows the structure of one Embodiment of the projector provided with the light source device of embodiment of this invention.

  The light source device according to Embodiment 1 of the present invention includes a light source and a disk-shaped phosphor wheel that transmits light from the light source, and the phosphor wheel is disposed through the phosphor and the space. A filter disposed at a position farther from the light source than the phosphor, and a housing having a side surface of the phosphor and an inner wall in contact with the side surface of the filter.

  According to this embodiment, since the filter is disposed at a position farther from the light source than the phosphor, only light in a desired wavelength region can be extracted and output from the light emitted from the phosphor. Further, since the filter is formed as a separate member from the phosphor, it is less susceptible to the heat generated by the phosphor. In addition, there is no adhesive layer that causes light loss between the phosphor and the filter, and the side surface of the phosphor and the side surface of the filter are covered with the inner wall of the housing, so that light does not escape from the side surface and light is emitted. A decrease in efficiency can be suppressed.

  The light source device according to Embodiment 2 of the present invention is the light source device according to Embodiment 1 described above, wherein the phosphor that emits light of a predetermined wavelength and the filter corresponding to the phosphor are arranged in the rotation direction of the phosphor wheel. A partition plate is provided at a boundary between the partial region and the other region in the rotation direction in the space.

  According to this embodiment, the partition plate separates the phosphor that emits light of a predetermined wavelength and the corresponding filter, so that light of various wavelength regions can be transmitted without mixing light of other wavelength regions. Can be output in splits.

  A light source device according to Embodiment 3 of the present invention includes a light source and a disk-shaped phosphor wheel that transmits light from the light source, and the phosphor wheel is in contact with the phosphor and the phosphor. A filter disposed at a position farther from the light source than the phosphor, and a housing having a side surface of the phosphor and an inner wall in contact with the side surface of the filter.

  According to this embodiment, since the filter is disposed at a position farther from the light source than the phosphor, only light in a desired wavelength region can be extracted and output from the light emitted from the phosphor. In addition, since the filter is formed as a separate member from the phosphor, it is less susceptible to the heat generated by the phosphor and the overall length of the housing 38 can be shortened, contributing to the downsizing of the phosphor wheel. it can. In addition, there is no adhesive layer that causes light loss between the phosphor and the filter, and the side surface of the phosphor and the side surface of the filter are covered with the inner wall of the housing, so that light does not escape from the side surface and light is emitted. A decrease in efficiency can be suppressed.

  In the light source device according to Embodiment 4 of the present invention, in any of Embodiments 1 to 3, the inner wall is provided with a convex portion for determining the positions of the phosphor and the filter.

  According to this embodiment, since the convex portions for determining the positions of the phosphor and the filter are provided, the positions of the phosphor and the filter can be reliably defined with a simple structure.

  In the light source device according to Embodiment 5 of the present invention, in any one of Embodiments 1 to 4, the diameter of the filter is equal to or less than the diameter of the phosphor.

  According to this embodiment, since the diameter of the filter is equal to or smaller than the diameter of the phosphor, the light emitted from the phosphor can be narrowed and emitted from the filter, and more uniform emission light can be obtained. Moreover, the housing and the phosphor wheel can be reduced in size, and a compact light source device can be realized.

  A light source device according to Embodiment 6 of the present invention is the light source device according to any one of Embodiments 1 to 5, wherein the filter is light from the light source and has a predetermined wavelength among the emitted light that passes through the phosphor. It is a filter that transmits light in a band.

  In this embodiment, the light incident on the filter includes light in the wavelength region of the emitted light from the light source and light in the wavelength region that has been wavelength-converted by the phosphor. In the present embodiment, since only light in a desired wavelength range can be extracted and output, a light source device with high light performance can be realized.

  In the light source device according to Embodiment 7 of the present invention, in any one of Embodiments 1 to 6, the phosphor wheel includes a substrate, and the substrate includes the phosphor.

  According to this embodiment, since the phosphor wheel is constituted by the substrate provided with the phosphor, a phosphor wheel having a stable structure can be provided at a low manufacturing cost.

  In the light source device according to Embodiment 8 of the present invention, in any one of Embodiments 1 to 7, the inner wall of the housing includes a reflection surface that reflects outgoing light passing through the phosphor.

  According to this embodiment, since the inner wall of the housing is provided with a reflecting surface that reflects the emitted light that passes through the phosphor, it can be incident on the filter while suppressing the attenuation of the light, thereby suppressing a decrease in luminous efficiency. Can do.

  The light source device according to Embodiment 9 of the present invention is the light source device according to any one of Embodiments 1 to 8, further including a first lens for condensing the emitted light from the light source on the phosphor wheel, and the phosphor wheel. A second lens that converts the light from the light into parallel light, and a drive device that rotates the phosphor wheel.

  According to this embodiment, the 1st lens which condenses the emitted light from a light source to a fluorescent substance wheel, the 2nd lens which makes the light from a fluorescent substance wheel parallel light, and the drive device which rotates a fluorescent substance wheel Therefore, it is possible to realize a light source device that outputs parallel light with excellent color rendering properties in a time-sharing manner.

  A projector according to a first embodiment of the present invention includes a light source device according to any one of the above embodiments 1 to 11 and light of a plurality of wavelength bands emitted from 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, it is possible to provide a projector that includes the light source device that is not easily affected by the heat generated by the phosphor and can suppress a decrease in luminous efficiency.
Next, a light source device according to an embodiment of the present invention and a projector according to an embodiment including the light source device will be described in detail with reference to the drawings.

(Description of Light Source Device of One Embodiment of the Present Invention)
The light source device of one embodiment of the present invention will be described.
First, the outline of the structure of the light source device according to one embodiment of the present invention will be described with reference to FIG. FIG. 1A is a perspective view schematically showing the light source device, and FIG. 1B is a side view schematically showing the light source device. In the phosphor wheel shown in FIG. 1B, a part of the housing is cut away so that the internal structure can be seen.
As shown in FIG. 1A, the light source device 2 includes a light source 10, a condensing lens 20 into which light emitted from the light source 10 is incident, a phosphor wheel 30 into which light emitted from the condensing lens 20 is incident, And a light receiving lens 40 on which light emitted from the phosphor wheel 30 enters. The phosphor wheel 30 is a disk-like phosphor wheel that transmits light from a light source, and is rotated by a drive motor 50 via a drive shaft 52. In FIG. 1, the light source 10 includes the light source 10, the condensing lens 20, the phosphor wheel 30, and the light receiving lens 40. However, the light source device 2 does not include the light receiving lens 40. There may be an embodiment in which the light source device 2 is configured by the condenser lens 20 and the phosphor wheel 30.

  Next, the outline of the light source device 2 will be described along the flow of light emitted from the light source 10. In the present embodiment, a semiconductor laser can be exemplified as the light source 10. Light of a predetermined wavelength band (explained by taking blue light as an example) is emitted from the light source 10, and the emitted light enters the condenser lens 20, is collected by the condenser lens 20, and is rotated by the drive motor 50. Is incident on the phosphor wheel 30. The phosphor wheel 30 is made of a material that transmits light, and the phosphor is provided in at least a part of the region. As a phosphor, for example, a red phosphor emits red light when blue light is incident, and a green phosphor emits green light when blue light is incident. Further, in a region where no phosphor is provided, the blue light from the light source is transmitted without being wavelength-converted. Therefore, if the phosphor wheel 30 is divided in the rotation direction into a region in which the red phosphor is provided, a region in which the green phosphor is provided, and a region in which the phosphor is not provided, from the condenser lens 20. When blue light enters the phosphor wheel 30, red light, green light, and blue light are emitted from the phosphor wheel 30 in a time-sharing manner and enter the light receiving lens 40. Then, the light is converted into parallel light by the light receiving lens 40 and emitted from the light source device 2.

<Description of phosphor wheel>
Next, the outline of the structure of the phosphor wheel 30 of the present invention will be described with reference to FIG.
The phosphor wheel 30 includes a substrate 32, a phosphor 34, a filter 36 disposed at a position farther from the light source 10 than the phosphor 34 through a space, an inner wall in contact with a side surface of the phosphor 34 and a side surface of the filter 36. And a housing 38 having In the present embodiment, the phosphor 34 is provided on the substrate 32 by coating or the like. The casing is cylindrical and has an inner wall.
Therefore, since the phosphor wheel 30 is constituted by the substrate 32 including the phosphor 34, the phosphor wheel 30 having a stable structure can be provided at a low manufacturing cost.
A housing 38 is joined to the outer peripheral edge of the substrate 32, and an inner wall 38 </ b> A of the housing 38 is in contact with the side surface of the phosphor 34. A filter 36 is attached to the end of the housing 38 far from the light source 10. The filter 36 is a disk-shaped member having a predetermined strength, and the side surface of the filter 36 is in contact with the inner wall 38 </ b> A of the housing 38, whereby the filter 36 is attached to the housing 38. The filter 36 having a predetermined intensity can be formed, for example, by providing a dielectric multilayer film on a transparent glass plate by vapor deposition or the like to selectively transmit light in a desired wavelength range. As described above, the phosphor 34 and the filter 36 are not in direct contact but are separated from each other. The inner wall 38 </ b> A of the housing 38 includes a reflecting surface that reflects outgoing light passing through the phosphor 34.

  The filter 36 is a filter that transmits light in the wavelength region converted by the phosphor 34 and reflects light in other wavelength regions. That is, since the filter 36 is disposed at a position farther from the light source 10 than the phosphor 34, only light in a desired wavelength region can be extracted and output from the light emitted from the phosphor 34. For example, if the phosphor 34 is composed of a red phosphor, a long pass filter that transmits light in the red wavelength range and reflects light in other wavelength ranges (shorter than the red wavelength range) can be exemplified. If the phosphor 34 is composed of a green phosphor, a bandpass filter that transmits light in the green wavelength region and reflects light in other wavelength regions (shorter and longer than the green wavelength region) can be exemplified. In the region where the phosphor is not provided, a short-pass filter that transmits light in the blue wavelength region and reflects light in other wavelength regions (longer than the blue wavelength region) can be exemplified.

As described above, the filter 36 of the present embodiment is a filter that transmits light in the predetermined wavelength band out of the light emitted from the light source 10 and passing through the phosphor 34.
The light that enters the filter 36 includes light in the wavelength range of the light emitted from the light source 10 and light in the wavelength range that has been wavelength-converted by the phosphor 34. The filter 36 extracts only light in the desired wavelength range. Therefore, the light source device 2 with high performance can be realized.

In the phosphor wheel having such a structure, the blue light condensed by the condenser lens 20 enters the substrate 32 of the phosphor wheel 30, passes through the substrate 32, and enters the phosphor 34. The light whose wavelength has been converted to a predetermined wavelength by the phosphor 34 travels through the space in the housing 38 while being reflected by the inner wall 38 </ b> A and enters the filter 36. Then, light in a predetermined wavelength region is emitted from the filter 36, enters the light receiving lens 40, is converted into parallel light by the light receiving lens 40, and is emitted from the light source device 2.
At this time, since the side surface of the phosphor 34 and the side surface of the filter 36 are covered with the inner wall 38A of the housing 38, light does not escape from these side surfaces, and a decrease in light emission efficiency can be suppressed. In addition, since there is no adhesive layer that causes light loss between the phosphor and the filter, it is possible to further suppress a decrease in light emission efficiency.
Further, although heat is generated when wavelength conversion is performed by the phosphor 34, the filter 36 is formed as a separate member from the phosphor 34, and thus is not easily affected by the heat generated by the phosphor 34. Deterioration of the filter film can be suppressed.

  As described above, in the present embodiment, the light source 10 and the disk-shaped phosphor wheel 30 that transmits light from the light source 10 are provided, and the phosphor wheel 30 is disposed between the phosphor 34 and the space. A filter 36 disposed at a position farther from the light source 10 than the phosphor 34, and a housing 38 having a side surface of the phosphor 34 and an inner wall 38 A in contact with the side surface of the filter 36 are included.

Therefore, since the filter 36 is disposed at a position farther from the light source 10 than the phosphor 34, only light in a desired wavelength region can be extracted and output from the light emitted from the phosphor 34. Further, since the filter 36 is formed as a separate member from the phosphor 34, it is not easily affected by the heat generated by the phosphor 34. Further, there is no adhesive layer that causes light loss between the phosphor 34 and the filter 36, and the side wall of the phosphor 34 and the side surface of the filter 36 are covered with the inner wall of the housing 38, so that light escapes from the side surface. In other words, a decrease in luminous efficiency can be suppressed.
In order to dissipate the heat generated from the phosphor 34 more effectively, for example, a cooling fin or the like can be provided on the outer surface of the housing 38.

  In particular, according to the present embodiment, since the inner wall 38A of the housing 38 includes the reflecting surface that reflects the outgoing light that passes through the phosphor 34, it can be incident on the filter 36 while suppressing the attenuation of light, and the luminous efficiency. Can be suppressed.

  Furthermore, in the light source device 2 of the present embodiment, the condenser lens (first lens) 20 that condenses the emitted light from the light source 10 onto the phosphor wheel 30 and the light reception that uses the light from the phosphor wheel 30 as parallel light. A lens (second lens) 40 and a drive device (drive motor 50 and drive shaft 52) for rotating the phosphor wheel 30 are provided. Therefore, the light source device 2 that outputs parallel light in a time division manner can be realized.

A dielectric that transmits blue light from the light source 10 and reflects light in the wavelength region converted by the phosphor 34 is incident on the surface of the phosphor wheel 30 on the incident side (side closer to the light source 10). A multilayer film can also be provided. Thereby, reflection of blue light from the light source 10 can be suppressed and incident on the phosphor wheel 30. Generally, about 4% of residual reflection occurs at the interface between glass and air, but the reflectance can be suppressed to 0.5% or less by depositing a dielectric multilayer film. . Furthermore, light returning to the light source 10 among the light converted in wavelength by the phosphor 34 can be reflected to the emission side by the dielectric multilayer film, so that the light emission efficiency of the light source device can be improved. Further, in order to improve luminance unevenness and chromaticity unevenness, particles such as scatterers such as SiO ₂ , TiO ₂ , and Ba ₂ SO ₄ can be applied.

<Description of each member constituting light source device>
Below, further detailed description of each member which comprises the light source device 2 is given.
[Light source 10]
When a blue semiconductor laser is used as the light source 10, it is preferable to emit light in the wavelength region of 370 to 500 nm, and it is more preferable to emit light in the wavelength region of 420 to 500 nm. However, the present invention is not limited to the case where a blue semiconductor laser is used as the light source 10, and a semiconductor laser having any other wavelength region can be used, and other types of light sources such as LEDs can be used.
[

Substrate 32 of phosphor wheel 30]
Any material can be used for the material of the transparent disk-shaped substrate 32 that transmits light as long as the material has high light transmittance. For example, glass, resin, sapphire, and the like can be used.

[Phosphor 34]
Examples of the phosphor 34 include a red phosphor that outputs red light and a green phosphor that outputs green light when blue light is incident from a light source as described above.
In the red phosphor that outputs red light, it is preferable to generate red fluorescence having a wavelength band of about 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.
In a green phosphor that outputs green light, it is preferable to generate green fluorescence in 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.

[Drive motor]
The drive motor 50 is a brushless DC drive motor, and is arranged so that the drive shaft 52 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 drive shaft 52. The rotation speed of the drive motor 50 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 50 (that is, the phosphor wheel 30) is preferably set to an integral multiple of 60 revolutions per second.

(Description of Light Source Device of Other Embodiment of the Present Invention)
Next, a light source device according to another embodiment of the present invention will be described with reference to FIG. FIG. 2A is a perspective view schematically showing a light source device according to another embodiment of the present invention, and FIG. 2B is a cross-sectional view taken along the line AA in FIG.
The difference from one embodiment of the light source device 2 shown in FIG. 1 is that a partition plate is provided on the phosphor wheel 30, and the other configurations are basically the same. Therefore, differences from the embodiment shown in FIG. 1 will be mainly described below.

<Description of phosphor wheel>
Also in the present embodiment, the phosphor wheel 30 includes the phosphor 34, the filter 36 disposed at a position farther from the light source 10 than the phosphor 34 through the space, the side surface of the phosphor 34, and the side surface of the filter 36. And a housing 38 having an inner wall in contact therewith. In some cases, a substrate is provided, and the phosphor 34 is provided on the substrate, and the housing 38 is attached to the substrate. The substrate 34 is not provided, and the phosphor 34, the filter 36, the partition plate 60, and the like are structured. It may be a member (discussed in detail later).
As shown in FIGS. 2A and 2B, in the present embodiment, the phosphor wheel 30 is partitioned into three regions by a central boss 62 and a partition plate 60.

Specifically, a red emission region SR provided with the red phosphor 34R, a green emission region SG provided with the green phosphor 34G, and a blue emission region SB provided with no phosphor are provided. In the red emission region SR, a red phosphor 34R is provided on the incident side (side closer to the light source 10), and a filter 36R corresponding to the red phosphor 34R is provided on the emission side (side far from the light source 10). The filter 36R corresponding to the red phosphor 34R can be exemplified by a long-pass filter that transmits light in the wavelength range of red light and reflects light in other wavelength ranges.
Similarly, in the green emission region SG, a green phosphor 34G is provided on the incident side (side closer to the light source 10), and a filter 36G corresponding to the green phosphor 34G is provided on the emission side (side far from the light source 10). Yes. The filter 36G corresponding to the green phosphor 34G can be exemplified by a band-pass filter that transmits light in the green wavelength region and reflects light in other wavelength regions.
In the blue emission region SB, neither a green phosphor nor a filter is provided, but a dielectric multilayer film or a scatterer layer can also be provided as described above. A dielectric multilayer film or a scatterer layer can also be provided in the red emission region SR and the green emission region SG.

As described above, in the present embodiment, the phosphors 34R and 34G that emit light of a predetermined wavelength (for example, red light and green light) and the filters 36R and 36G corresponding to the phosphors 34R and 34G are phosphor wheels. It is provided in a part of the region in the 30 rotation directions, and the space of each region is partitioned from other regions by a partition plate.
Therefore, the partition plate 60 separates the phosphor 34 (for example, 34R, 34G) that emits light of a predetermined wavelength and the corresponding filter 36 (for example, 36R, 36G), so that light in other wavelength regions can be separated. Without mixing, light in various wavelength ranges can be output in a time division manner.

  Further, the surface of the partition plate 60 is provided with a reflection surface that reflects the emitted light passing through the phosphor 34, similarly to the inner wall 38 </ b> A of the housing 38. That is, each color emission region partitioned by the partition plate 60 is surrounded by the inner wall 38A of the housing 38 and the reflection surface provided on the partition plate 60, and the light transmitted through the phosphor is reflected by these reflection surfaces. And enters the filter 36. Therefore, by this partition plate 60, the attenuation of light can be suppressed and incident on the filter 36, and a decrease in light emission efficiency can be suppressed. In addition, although it is detail, the reflective surface is provided also in the boss | hub 62 to which the partition plate 60 was attached, and the fall of luminous efficiency can be suppressed.

(Description of phosphor wheel of embodiment of the present invention)
Next, various embodiments of the light source device according to another embodiment of the present invention, in particular, the phosphor wheel will be described with reference to FIGS.
<Description of Embodiment shown in FIG. 3>
First, an embodiment of the phosphor wheel shown in FIG. 3 will be described. FIG. 3 is a side view schematically showing the phosphor wheel, in which a part of the housing is cut away so that the internal structure can be seen.
Also in the phosphor wheel shown in FIG. 3, the phosphor 34 disposed at a position close to the light source, the filter 36 disposed at a position farther from the light source than the phosphor 34, spaced from the phosphor 34, and the fluorescence And a housing 38 having an inner wall 38A in contact with the side surface of the body 34 and the side surface of the filter 36. The embodiment shown in FIG. 3 differs from the embodiment shown in FIGS. 1 and 2 in that it does not include a substrate.

In the present embodiment, the phosphor 34 and the filter 36 are constituted by disk-shaped members having a predetermined strength. For example, a phosphor 34 having a predetermined strength can be formed by providing a phosphor on a transparent glass plate by coating or the like, and a predetermined thickness can be obtained by providing a dielectric multilayer film on the transparent glass plate by vapor deposition or the like. The filter 36 having the following strength can be formed.
The disk-shaped phosphor 34 and the filter 36 are fixed to the drive shaft 52, and the housing 38 is fixed so that the inner wall 38A is in contact with the side surface of the phosphor 34 and the side surface of the filter 36.
When the partition plate 60 is provided as in the embodiment shown in FIG. 2, the casing 38 is supported by using the partition plate 60 and the central boss 62 as strength members instead of the phosphor 34 and the filter 36. Such a structure can also be adopted.

<Description of Embodiment shown in FIG. 4>
Next, an embodiment of the phosphor wheel shown in FIG. 4 will be described. FIG. 4 is a side view schematically showing the phosphor wheel, in which a part of the housing is cut away so that the internal structure can be seen.
In the embodiment shown in FIG. 4, the phosphor wheel and the filter 36 are in contact with each other (there is no space between them), and FIG. 4A shows the phosphor wheel having the substrate. 4 (b) shows a phosphor wheel having no substrate.
That is, the light source device including the phosphor wheel shown in FIGS. 4A and 4B includes a light source and a disk-shaped phosphor wheel 30 that transmits light from the light source. Includes a phosphor 34, a filter disposed in contact with the phosphor 34 at a position farther from the light source than the phosphor 34, and a housing 38 having an inner wall 38 </ b> A in contact with the side surface of the phosphor 34 and the side surface of the filter 36. , Including.

At this time, the embodiment shown in FIG. 4A includes a substrate 32 fixed to the drive shaft 52, the phosphor 34 is provided on the substrate 32 by coating or the like, and the housing 38 is attached to the substrate 32. ing. A disk-shaped filter 36 having a predetermined strength is attached so that the side surface of the filter 36 is in contact with the inner wall 38 </ b> A of the housing 38.
On the other hand, in the embodiment shown in FIG. 4B, the substrate 32 is not provided, and the phosphor 34 and the filter 36 are formed of a disk-shaped member having a predetermined strength. The disk-shaped phosphor 34 and the filter 36 are fixed to the drive shaft 52, and the housing 38 is fixed so that the inner wall 38A is in contact with the side surface of the phosphor 34 and the side surface of the filter 36.
In the same manner as described above, for example, a phosphor 34 having a predetermined strength can be formed by providing a phosphor on a transparent glass plate by coating or the like, and a dielectric multilayer film can be formed on the transparent glass plate by vapor deposition or the like. By providing, the filter 36 having a predetermined strength can be formed.

  As described above, according to the present embodiment shown in FIGS. 4A and 4B, the filter 36 is disposed at a position farther from the light source than the phosphor 34, and thus the light emitted from the phosphor 34. Of these, only light in a desired wavelength region can be extracted and output. Further, since the filter 36 is formed as a separate member from the phosphor 34, the filter 36 is not easily affected by the heat generated by the phosphor 34 and the entire length of the housing 38 can be shortened. Contributes to downsizing. Further, there is no adhesive layer that causes light loss between the phosphor 34 and the filter 36, and the side wall of the phosphor 34 and the side surface of the filter 36 are covered with the inner wall 38 </ b> A of the housing 38. Without escaping, a decrease in luminous efficiency can be suppressed.

<Description of Embodiment shown in FIG. 5>
Next, an embodiment of the phosphor wheel shown in FIG. 5 will be described. FIG. 5 is a cross-sectional view schematically showing a cross section of a region where the phosphor of the phosphor wheel is provided. In the embodiment shown in FIG. 5, the phosphor wheel has a space between the phosphor and the filter as shown in FIGS. 1 to 3, and is provided with convex portions for determining the positions of the phosphor and the filter. ing.
In FIG. 5A, the phosphor 34 disposed at a position close to the light source, the filter 36 disposed at a position farther from the light source than the phosphor 34, spaced from the phosphor 34, and the phosphor 34. A convex portion 70 for determining the positions of the phosphor 34 and the filter 36 so as to contact the phosphor 34 and the filter 36. It is provided on the inner wall 38A of the body 38. Further, a detachable attachment member 72 is attached to both end portions (an end portion close to the light source and an end portion far from the light source) of the housing, and the phosphor 34 is interposed between the attachment member 72 and the side surface of the convex portion 70. Alternatively, the filter 36 is sandwiched and fixed.

In the embodiment shown in FIG. 5 (b), the distance between the phosphor 34 and the filter 36 is larger than that in the embodiment shown in FIG. 5 (a), and the inner wall 38A of the housing 38 is spaced apart by a predetermined distance. It differs from the embodiment shown in FIG. 5A in that two convex portions 70 are provided. In other respects, it is the same as the embodiment shown in FIG. 5A, and detachable attachment members 72 are attached to both end portions (an end portion close to the light source and an end portion far from the light source) of the housing. The phosphor 34 or the filter 36 is sandwiched and fixed between the mounting member 72 and the side surface of the convex portion 70.
However, the use of the attachment member 72 is merely an example for fixing the phosphor 34 and the filter 36, and any other fixing method can be adopted.
As described above, in the embodiment shown in FIG. 5, the inner wall 38 </ b> A of the housing 38 is provided with the convex portions 70 for determining the positions of the phosphor 34 and the filter 36, so that the fluorescent light can be reliably emitted with a simple structure. The position of the body 34 and the filter 36 can be defined.

<Description of Embodiment shown in FIG. 6>
Next, an embodiment of the phosphor wheel shown in FIG. 6 will be described. FIG. 6 is a cross-sectional view schematically showing a cross section of a region where the phosphor of the phosphor wheel is provided. In the embodiment shown in FIG. 6, the phosphor wheel has no space between the phosphor and the filter as shown in FIG. 4, and is provided with convex portions for determining the positions of the phosphor and the filter.
In FIG. 6, the phosphor 34 disposed at a position close to the light source, the filter 36 disposed at a position far from the light source than the phosphor 34 in contact with the phosphor 34 (without a space), and the fluorescence A convex portion 70 for determining the positions of the phosphor 34 and the filter 36 so as to contact the phosphor 34 and the filter 36. The inner wall 38A of the casing 38 is provided. In this embodiment, the convex part 70 is provided in one edge part (for example, edge part near a light source) of the housing | casing 38. As shown in FIG. A detachable attachment member 72 is attached to the other end of the housing 38. The phosphor 34 and the filter 36 are sandwiched and fixed between the mounting member 72 and the side surface of the convex portion 70. However, the attachment member 72 is used only as an example for fixing the phosphor 34 and the filter 36, and any other fixing method can be adopted. For example, it is conceivable to use a casing 38 provided with projections 70 at both ends, which can be divided into two parts. A similar configuration can be realized by joining the two divided housings 38 so as to sandwich the phosphor 34 and the filter 36.

  As described above, also in the embodiment shown in FIG. 6, since the convex portion 70 for determining the positions of the phosphor 34 and the filter 36 is provided on the inner wall 38 </ b> A of the housing 38, it is ensured with a simple structure. The positions of the phosphor 34 and the filter 36 can be defined.

<Description of Embodiment shown in FIG. 7>
Next, an embodiment of the phosphor wheel shown in FIG. 7 will be described. FIG. 7 is a side view schematically showing the phosphor wheel, in which a part of the housing is cut away so that the internal structure can be seen. In the embodiment shown in FIG. 7, the diameter of the filter 36 is smaller than or less than the diameter of the phosphor 34, and FIG. 7 (a) shows a phosphor wheel 30 having a substrate, and FIG. ) Shows the phosphor wheel 30 having no substrate.
In the embodiment shown in FIG. 7A, a substrate 32 fixed to the drive shaft 52 is provided, the phosphor 34 is provided on the substrate 32 by coating or the like, and the housing 38 is attached to the substrate 32. A disc-shaped filter 36 having a predetermined strength is attached so that the side surface of the filter is in contact with the inner wall 38 </ b> A of the housing 38.
On the other hand, in the embodiment shown in FIG. 7B, the substrate 32 is not provided, and the phosphor 34 and the filter 36 are formed of a disk-shaped member having a predetermined strength. The disk-shaped phosphor 34 and the filter 36 are fixed to the drive shaft 52, and the housing 38 is fixed so that the inner wall 38A is in contact with the side surface of the phosphor 34 and the side surface of the filter 36.
In the same manner as described above, for example, a phosphor 34 having a predetermined strength can be formed by providing a phosphor on a transparent glass plate by coating or the like, and a dielectric multilayer film can be formed on the transparent glass plate by vapor deposition or the like. By providing, the filter 36 having a predetermined strength can be formed.

  According to the present embodiment, since the diameter of the filter 36 is equal to or smaller than the diameter of the phosphor 34, the light emitted from the phosphor 34 can be narrowed and emitted from the filter 36, and more uniform emission light can be obtained. Can do. Furthermore, the housing 38 and the phosphor wheel 30 can be reduced in size, and the compact light source device 2 can be realized.

(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 type DLP projector will be described with reference to FIG. FIG. 8 is a schematic diagram for illustrating the configuration of the projector 4 including the light source device 2 shown in the above-described embodiment, and is a schematic plan view of the light source device 2 and the projector 4 as viewed from above. is there.
In FIG. 8, the light emitted from the light source device 2 enters a DMD (Digital Micromirror Device) element (light modulation means) 80, which is an optical spatial modulator, via an optical system. Then, the light is reflected by the DMD element 80, collected by the projection lens 82 that is a projection unit, and projected onto the screen 90. The DMD element 80 is an array of fine mirrors corresponding to each pixel of the image projected on the screen, and turns on the light emitted to the screen by changing the angle of each mirror 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. Further, the light source device 2 and the projector 4 using the light source device 2 according to the present invention are not limited to the above-described embodiments, and other various embodiments are included in the present invention.
In the present embodiment, the light receiving lens 40 is included in the light source device 2, but is not limited thereto. For example, the light receiving lens 40 may not be included in the light source device 2 but may be included in a part of the optical system.

As described above, the projector 4 according to the present embodiment sequentially modulates light of a plurality of wavelength bands emitted from the light source device 2 based on the light source device 2 shown in the above-described embodiment and the image data. A DMD element (light modulation means) 80 to be formed and a projection lens (projection means) 82 for enlarging and projecting an image are provided.
According to the present embodiment, it is possible to provide the projector 4 that includes the light source device 2 that is not easily affected by the heat generated by the phosphor and can suppress a decrease in light emission efficiency.

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

2 Light source device 4 Projector 10 Light source 20 Condensing lens 30 Phosphor wheel 32 Substrate 34 Phosphor 34R Red phosphor 34G Green phosphor 36 Filter 38 Housing 38A Inner wall 40 Light receiving lens 50 Drive motor 52 Drive shaft 60 Partition plate 62 Boss 70 Convex part 72 Mounting member 80 DMD element 82 Projection lens 90 Screen SR Red emission area SG Green emission area SB Blue emission area

Claims (10)

A light source;
A disc-shaped phosphor wheel that transmits light from the light source;
With
The phosphor wheel is
A phosphor,
A filter disposed at a position farther from the light source than the phosphor through a space;
A housing having an inner wall in contact with a side surface of the phosphor and a side surface of the filter;
A light source device comprising:   The phosphor that emits light of a predetermined wavelength and the filter corresponding to the phosphor are provided in a partial region in the rotation direction of the phosphor wheel, and the partial region and the rotation in the space The light source device according to claim 1, wherein a partition plate is provided at a boundary with another region in the direction. A light source;
A disc-shaped phosphor wheel that transmits light from the light source;
With
The phosphor wheel is
A phosphor,
A filter disposed in contact with the phosphor and at a position farther from the light source than the phosphor;
A housing having an inner wall in contact with a side surface of the phosphor and a side surface of the filter;
A light source device comprising:   4. The light source device according to claim 1, wherein the inner wall is provided with a convex portion for determining the positions of the phosphor and the filter. 5.   5. The light source device according to claim 1, wherein a diameter of the filter is equal to or less than a diameter of the phosphor.   6. The filter according to claim 1, wherein the filter is a filter that transmits light in a predetermined wavelength band from light emitted from the light source and that passes through the phosphor. The light source device according to 1.   The light source device according to claim 1, wherein the phosphor wheel includes a substrate, and the phosphor is provided on the substrate.   The light source device according to any one of claims 1 to 7, wherein an inner wall of the housing includes a reflection surface that reflects outgoing light passing through the phosphor. A first lens for condensing the emitted light from the light source on the phosphor wheel;
A second lens that collimates light from the phosphor wheel;
A driving device for rotating the phosphor wheel;
The light source device according to claim 1, further comprising: The light source device according to any one of claims 1 to 9,
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;
A projector comprising:

Images