JP2014092599A - Optical conversion device and projection display device including optical conversion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical conversion device capable of increasing the reliability and conversion efficiency and a projection display device including the same.SOLUTION: The optical conversion device includes: a fluorescent wheel device driven by a motor to rotate, which has a fluorescent wheel having a fluorescent substance layer formed thereon; a blower for feeding the air to a light-emitting part of the fluorescent substance on the fluorescent substance layer; a fluorescent wheel case storing the fluorescent wheel device and the blower, which has a circulation path formed to allow the air from the blower to flow in one direction, and which forms a sealed space; a heat exchanger disposed in the circulation path for exchanging the heat between the inside and the outside of the fluorescent wheel case; and an optical lens disposed to cover an opening formed in the fluorescent wheel case to allow a beam of excitation light for exciting the fluorescent substance to pass therethrough and collect the light generated by the fluorescent substance.

Description

  The present disclosure relates to a light conversion device and a projection display device including the light conversion device.

  Conventionally, a light source device for a projection display device that uses a high-pressure mercury lamp has been mainstream, but recently, as disclosed in Patent Document 1, a phosphor is excited by light emitted from a laser diode, and fluorescent light is emitted. The thing using the light fluorescently emitted from the body has been developed. However, due to the temperature characteristics of the light conversion efficiency of the phosphor itself and the heat resistance of a binder for forming the phosphor on the substrate, it is necessary to suppress the temperature rise. Therefore, a phosphor layer is formed on a disk substrate, and is attached to a motor and rotated to always move a portion that emits fluorescence, thereby suppressing an increase in temperature.

  However, as the brightness of the projection display device increases, the excitation light also increases, cooling performance is insufficient, and the phosphor wheel is cooled by a cooling fan or the like, but dust in the air is excited on the phosphor surface by the excitation light. This leads to a situation where the conversion efficiency decreases due to burn-in. For this reason, there is a method of filtering the air blown by the cooling fan through a dust filter, but it is necessary to periodically remove dust clogged in the filter.

JP 2011-134668 A

  The present disclosure provides a light conversion device capable of improving reliability and conversion efficiency, and a projection display device including the light conversion device.

  The light conversion device according to the present disclosure includes a phosphor wheel device in which a phosphor layer is formed and a phosphor wheel that is rotationally driven by a motor is attached, and a blower that blows air to the phosphor light-emitting portion of the phosphor layer. A phosphor wheel case that houses the phosphor wheel device and the blower and has a circulation path formed so that the wind of the blower flows in one direction, and that is disposed on the circulation path. A heat exchanger that transfers heat to and from the inside and outside of the phosphor wheel case, and an opening formed in the phosphor wheel case are covered, passes excitation light that excites the phosphor, and emits light from the phosphor. An optical lens that collects the emitted light is provided.

  According to the present disclosure, it is possible to provide a light conversion device capable of improving reliability and conversion efficiency by directly air-cooling a phosphor wheel in a sealed case, and a projection display device including the light conversion device.

FIG. 2 is a schematic diagram showing a projection display apparatus according to the first embodiment. FIG. 3 shows a main part of the light conversion device according to the first embodiment. 2 is an explanatory diagram of a light conversion device according to Embodiment 1. FIG. 1 is an external perspective view of a light conversion device according to Embodiment 1. FIG. FIG. 3 shows an inside of the light conversion device according to the first embodiment. FIG. 6 is an external perspective view of a light conversion device according to Embodiment 2. The figure which shows the inside of the optical converter regarding Embodiment 2. FIG. FIG. 9 is a perspective view showing a light conversion device according to Embodiment 3.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

The inventor provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is not intended to limit the subject matter described in the claims. Absent.
(Embodiment 1)
The first embodiment will be described below with reference to FIGS.

  FIG. 1 is a diagram illustrating a configuration of a projection display device 700 that can be used in the light conversion device of the present disclosure. In FIG. 1, reference numeral 1 denotes a plurality of blue laser diodes 2, a collimator lens 3 formed by collimating the blue light of these blue laser diodes 2, and a condensing lens 4 that collects blue light output from the collimator lens 3. An excitation light source composed of

  Reference numeral 5 denotes a lens that receives blue light emitted from the condenser lens 4 and converts it into parallel light. The blue light emitted from the lens 5 passes through a dichroic mirror 6 that transmits blue light and reflects green light, and is incident on a condensing / parallelizing lens 7 formed of a pair of convex lenses.

  The blue light incident on the condensing / collimating lens 7 is applied to the green phosphor 82 formed as a phosphor layer in a ring form on the phosphor wheel 81 of the phosphor wheel device 8 whose details are shown in FIG. 3 is condensed to excite the green phosphor 82. The phosphor wheel device 8 is configured to rotationally drive the phosphor wheel 81 by a motor 83. As a result, the phosphor is prevented from being burned by the blue excitation light collected there. FIG. 2B is a side view of the green phosphor 82 taken along the line A-A ′ in the plan view of FIG.

  The green light excited by the excitation light and emitted from the green phosphor 82 of the phosphor wheel 81 is incident on the condensing / collimating lens 7, collimated, and emitted to the dichroic mirror 6. The dichroic mirror 6 reflects the green light from the condensing / parallelizing lens 7 and emits the green light to the dichroic mirror 9 that transmits green and reflects red.

  A red light source 10 includes a red LED (light emitting diode) 11 and a collimating lens 12 including a pair of convex lenses. Red light from the red LED 11 is collimated by the collimating lens 12 and emitted to the dichroic mirror 9. The

  The red light emitted from the collimating lens 12 is reflected by the dichroic mirror 9 and enters the dichroic mirror 13 that transmits the red light and the green light and reflects the blue light.

  A blue light source 14 includes a blue LED (light emitting diode) 15 and a collimating lens 16 including a pair of convex lenses. Blue light from the blue LE 15 is collimated by the collimating lens 16 and emitted to the dichroic mirror 13. The

  In this way, the green light from the phosphor wheel device 8 is reflected by the dichroic mirror 6, then passes through the dichroic mirrors 9 and 13 and enters the condenser lens 17. The red light emitted from the red light source 10 is reflected by the dichroic mirror 9, passes through the dichroic mirror 13, and enters the condenser lens 17. The blue light emitted from the blue light source 14 is reflected by the dichroic mirror 13 and enters the condenser lens 17.

  The condensing lens 17 condenses the green light, the red light, and the blue light and emits them to one end surface of the rod integrator 18. The outgoing light emitted from the other end surface of the rod retractor 18 passes through the relay lenses 19 and 20 and is emitted to the total reflection mirror 21.

  The light reflected by the total reflection mirror 21 passes through the lens 23 and enters a DMD (Digital Mirror Device) 24. The DMD 24 modulates incident light with a video signal and outputs the modulated light to the projection lens 25 through the lens 23. The projection lens 25 enlarges and projects incident light onto a screen (not shown).

  As described above, the excitation light from the excitation light source 1 excites the green phosphor 82 on the fluorescent wheel 81 to generate fluorescent light emission, but not all is converted into fluorescent light emission, but part is changed to heat. The temperature of the green phosphor 82 is raised. When the temperature of the green phosphor 82 rises, the light conversion efficiency decreases, or the binder for forming the green phosphor 82 on the phosphor wheel 81 causes thermal discoloration. The temperature rise is suppressed by rotating it attached to.

  However, as the brightness of the projection display device increases, the excitation light also becomes stronger, and the cooling performance is insufficient only by rotating the phosphor, and it is necessary to cool the phosphor with cooling air.

  For this reason, in the present embodiment, the phosphor is cooled by the configuration as shown in FIGS. In FIG. 4, 26 is a metallic phosphor wheel case having a flat rectangular parallelepiped shape, and forms a sealed space. FIG. 5 is a view showing the internal structure by removing one side 261 of the phosphor wheel case 26 of FIG.

  A heat exchanger 27 in which a plurality of metallic radiation fin structures are formed is provided on one end surface of the phosphor wheel case 26. Reference numeral 28 denotes a blower (sirocco fan) for circulating the air inside the phosphor wheel case 26, and the air sucked from the suction port 281 is sent out from the exhaust port 282. Inside the phosphor wheel case 26, a partition wall 29 is integrally formed with the phosphor wheel case 26 to form a circulation path C for circulating the air inside.

  The partition wall 29 is formed along the outer periphery of the blower 28, and a “one” -shaped portion 291 is connected to the upper end of the “shi” character, and is provided substantially parallel to the upper surface of the phosphor wheel case 26. The exhaust port 282 of the blower 28 is disposed on the upper end side of the “shi” -shaped portion 261 and is provided to oppose the heat exchanger 27.

  The phosphor wheel device 8 is disposed substantially below the center of the phosphor wheel case 26 so as to be surrounded by the partition walls 29, and blows out from the blower 28 so that the wind strikes the phosphor wheel 81.

  The condensing / collimating lens 7 is fitted in an opening formed at a substantially central portion of the phosphor wheel case 26 without a gap through an attachment member, and is arranged so as to cover the opening. Therefore, the excitation light incident on the condensing / parallelizing lens 7 from the outside of the phosphor wheel case 26 passes through the condensing / parallelizing lens 7 and is green on the phosphor wheel 81 provided inside the phosphor wheel case 26. Excites the phosphor.

  When the green phosphor is excited, the phosphor emits fluorescent light and generates heat. As described above, the wind from the blower 28 hits the phosphor including the phosphor light emitting portion of the phosphor wheel 81, deprives the phosphor of heat, and the wind warmed by the heat of the phosphor strikes the heat exchanger 27. The warmed wind is deprived of heat by the heat exchanger 27 and returns to the air inlet 281 of the blower 28 through the upper side of the “one” -shaped portion 292 of the partition wall.

  In this way, the wind of the blower 28 flows in one direction and circulates in the circulation path C indicated by the arrow in FIG. 5, so that the wind warmed by the heat of the excited phosphor is disposed on the circulation path. Heat exchange between the inside and outside of the phosphor wheel case 26 is performed by the heat exchanger 27. Therefore, heat is removed by the heat exchanger 27 and the cooled air returns to the blower 28 and is used to cool the phosphor again.

  Thus, according to the present embodiment, since the green phosphor 82 on the phosphor wheel 81 is directly cooled by the blower 28, the light conversion efficiency can be improved and the brightness of the fluorescent light can be increased. Become. Further, the reliability of the binder used for applying the phosphor can be secured. Further, since the wind is circulated in the space sealed by the phosphor wheel case 26, the light output is not reduced due to dust seizure or the like.

  Therefore, by using the light source device described in Embodiment 1, it is possible to maintain a stable luminance for a long time as a projection display device.

(Embodiment 2)
Next, Embodiment 2 will be described with reference to FIGS.

  For convenience of explanation, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 6, reference numeral 26 denotes a metal phosphor wheel case having a flat rectangular parallelepiped shape, which forms a sealed space. FIG. 7 is a view showing the internal structure by removing one side 261 of the phosphor wheel case 26 of FIG.

  The difference between the second embodiment and the first embodiment is that a cooling pipe 100 in which a refrigerant circulates is connected to the heat exchanger 27 and arranged around the phosphor wheel case 26. The refrigerant inside the cooling pipe 100 is circulated by a pump (not shown), and the heat inside the case taken away by the heat exchanger 27 is radiated and circulated by a refrigerant at a heat radiating part (not shown) outside the case.

  In this embodiment, in addition to the effects in the first embodiment, the cooling pipe in which the refrigerant circulates is used, so that the cooling effect can be further enhanced.

(Embodiment 3)
Next, Embodiment 3 will be described with reference to FIG.

  For convenience of explanation, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 8 showing the inside through, the heat exchange structure of a rectangular metal-made phosphor wheel case 26 that forms a sealed space is different from that of the first embodiment.

  That is, in the present embodiment, the heat absorption part 300 composed of a plurality of fins is arranged on the circulation path of the wind blown from the exhaust port 282 of the blower 28 inside the phosphor wheel case 26, The heat-absorbing part 400 and the heat-dissipating part 400 are connected by the heat pipe 500 while the heat-dissipating part 400 composed of fins is disposed to face the one side surface of the phosphor wheel case 26.

  Therefore, the heat absorption part 300 absorbs heat inside the case, the heat pipe 500 conducts the heat to the heat radiation part 400, and the heat radiation part 400 radiates heat.

  In the third embodiment, in addition to the effects described in the first embodiment, a cooling effect higher than that in the first embodiment can be obtained. Moreover, since the refrigerant | coolant like Embodiment 2 is not used, the pump which circulates it is not required.

  As described above, Embodiments 1 to 3 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. Moreover, it is also possible to combine each component demonstrated in the said Embodiment 1-3 and it can also be set as new embodiment.

  As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.

  Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

  The present invention is applicable to a light conversion device and a projection display device including the light conversion device.

DESCRIPTION OF SYMBOLS 1 Excitation light source 2 Blue laser diode 6, 9, 13 Dichroic mirror 7 Condensing / collimating lens 4, 17 Condensing lens 8 Phosphor wheel device 24 DMD
25 Projection lens 26 Phosphor wheel case 27 Heat exchanger 28 Blower 29 Bulkhead 82 Green phosphor 83 Motor 100 Cooling piping

Claims (6)

A phosphor wheel device in which a phosphor layer is formed and a phosphor wheel that is rotationally driven by a motor is attached;
A blower for blowing wind to the phosphor light emitting part of the phosphor layer;
A phosphor wheel case that houses the phosphor wheel device and the blower and has a circulation path formed so that the wind of the blower flows in one direction, and forms a sealed space;
A heat exchanger arranged on the circulation path for transferring heat to and from the inside and outside of the phosphor wheel case;
It is arranged so as to cover the opening provided in the phosphor wheel case, and includes an optical lens that passes excitation light that excites the phosphor and condenses the emitted light emitted from the phosphor. To convert light.   The light conversion device according to claim 1, wherein the phosphor wheel case is made of metal.   3. The light conversion device according to claim 2, wherein a fin structure is formed in a part of the phosphor wheel case.   3. The light conversion device according to claim 2, wherein the pipe in which the refrigerant circulates is a heat exchanger arranged around the phosphor wheel case.   The light conversion device according to claim 1, wherein the heat exchanger has fins formed at both ends of the heat pipe.   A light conversion device according to any one of claims 1 to 5, a light source that excites a phosphor, a display element that forms a projection image, a light source, a light conversion device, a display element, and a projection lens. A projection display device comprising: an optical component that optically connects the two.

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