JP2005062419A - Light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device capable of efficiently cooling a solid light source, increasing the brightness of the solid light source, and maintaining the performance for a long time by forcibly convection the cooling liquid in the cooling case to which the solid light source is fixed with the blade member. To do.
A light source device includes: an LED that is a solid light source; a metal substrate that fixes the LED; a cooling case that includes the metal substrate that is fixed; The blade member 51 is provided inside the vehicle so as to be drivable.
[Selection] Figure 1

Description

  The present invention relates to a light source device that efficiently cools heat generated by a solid light source or the like by forced convection of a cooling liquid in a housing.

  In recent years, electronic devices such as projectors that use solid-state light sources such as light-emitting diodes (LEDs) for illumination have been promoted in miniaturization and higher brightness, and the heat density in the devices has increased compared to conventional devices. There is a need to further improve the cooling performance of the light source device, which is a heat source.

  For this reason, a light emitting element such as an LED is mounted on the wiring board, and a frame having a hole around the light emitting element is fixed to the wiring board, and the hole in the frame is inactive and translucent. After the liquid is put in, the lens plate, which is a lid formed of a transparent resin, is fixed so as to seal the liquid, and the natural convection of the liquid promotes heat transport from the light emitting element and the wiring board. An apparatus has been proposed (see, for example, Patent Document 1).

  Further, the LED is immersed in an insulating, inert and translucent liquid sealed in the casing, and a heat-dissipating fin formed in the casing is provided in a portion in contact with the liquid, Alternatively, a light source device is known in which a metal frame is provided in a lens portion that seals the housing, and heat is conducted to these fins and the metal frame to promote cooling (see, for example, Patent Document 2).

Further, there is known a cooling body structure in which a heat generating component is fixed to a cooling body that is a casing, bubbles are generated in the refrigerant in the cooling body, and the refrigerant is circulated by the bubbles (for example, see Patent Document 3).
JP 2001-36148 A (3rd to 4th pages, FIG. 1 and FIG. 2) JP 2001-36153 A (page 3, FIGS. 1 and 2) JP-A-8-1553839 (page 3, FIG. 1)

In Patent Document 1, since the cooling liquid is circulated by natural body convection in the frame, the circulation speed is slow and sufficient cooling cannot be performed. Therefore, the LED temperature rises and the luminance cannot be increased.
Moreover, since the lens part which is a heat radiating part to the outside of the frame body is made of synthetic resin or glass, there is a problem that the thermal conductivity is lower than that of a metal having a high thermal conductivity, resulting in a thermal resistance. .

  Moreover, in patent document 2, since the fin for heat radiation is provided in the housing | casing, or the metal frame is provided in the lens part which seals a housing | casing, the heat | fever which LED generate | occur | produces in these fins and a metal frame is conducted. Although the thermal resistance to the outside of the housing is reduced, the cooling liquid is natural convection. In natural convection, there is a problem that the convection speed is slow and sufficient cooling cannot be performed.

In Patent Document 3, the heat generating component is fixed to the cooling body, bubbles are generated in the refrigerant in the cooling body, and the refrigerant is circulated by the bubbles. The refrigerant in which bubbles are present has a low specific gravity, and the refrigerant in which bubbles are mixed moves to a lighter specific gravity.
Although the refrigerant circulates by this movement, there is a problem that the temperature difference between the upper part of the circulation with a small specific gravity and the downstream part with a large specific gravity becomes large, and the heat generating components cannot be cooled uniformly.

  An object of the present invention is to provide a light source device capable of efficiently cooling a solid light source, increasing the brightness of the solid light source, and maintaining performance over a long period of time by forcibly convection of a cooling liquid in a housing to which the solid light source is fixed. That is.

The light source device of the present invention is provided with a solid light source, a substrate to which the solid light source is fixed, a casing to which the substrate is fixed and a cooling liquid is sealed inside, and a drivable inside the casing. And a blade member.
Here, as the solid light source, an LED (light emitting diode), a laser diode, an EL (electroluminescence), or the like can be employed.
Further, the cooling liquid is not particularly limited, but water, silicone oil having good fluidity, or the like is employed.

According to this invention, the solid light source is fixed to the housing via the substrate, and the housing is a sealed container in which the cooling liquid is accommodated. A blade member or the like that is rotationally driven or reciprocally driven is provided inside the housing, and is driven by, for example, a control circuit outside the housing, so that the cooling liquid is forcibly convected inside the housing. As a result, the cooling liquid convects along the inner surface of the casing through which the heat generated from the solid light source is conducted, and highly efficient cooling can be performed.
In addition, the cooling liquid to which heat is transmitted from the solid light source is also transmitted to the casing in the process of forced convection, but for example, heat is radiated from the cooling fins provided in the casing to the air. The cooling effect is further enhanced.
Thus, since efficient cooling can be performed, the brightness of the solid light source can be increased,
Degradation of the solid light source due to temperature rise can be prevented.

In the present invention, the blade member includes a rotation shaft and a plurality of blades provided on the rotation shaft, and one end of the rotation shaft is inserted into the housing and is a magnet fixed to the end portion. And a stator is provided at a position facing each other with a gap in the direction of the end face of the magnet, and the casing is sealed at a position between the magnet and the stator, where the magnet has a gap. It is preferable that a sealing plate is provided.
According to the present invention, the rotating shaft is provided with a plurality of blade portions, and the rotating shaft includes a magnet and a stator provided facing the end face of the magnet (the configuration of such a magnet and a stator). Is called an axial gap motor), the blades are efficiently rotated, and the cooling effect can be enhanced.

  In addition, a sealing plate is provided between the magnet and the stator, and this sealing plate is fixed to the casing by means such as press fitting, adhesion, welding welding, etc. And the cooling performance of the light source device can be maintained over a long period of time.

Moreover, in this invention, it is desirable for the diameter of the said blade | wing part to be 2 mm or more and 10 mm or less.
In such a structure, when the solid light source is an LED, one side of the LED is 1 mm to 2 mm, and the substrate to which the LED is fixed is often a square having a diameter of 8 mm or a side of about 8 mm to 10 mm. The diameter of the blade is 2 mm or more and 10 mm, so that the LED light source is efficiently cooled.
At this time, in order to efficiently perform convection of the liquid in the housing, the outer diameter of the blade portion is 1/3 to 2/3 of the inner side of the housing, although it is also affected by the size of the inner side of the housing. It is preferable to set within the range.

In the present invention, the sealing plate is preferably made of a non-magnetic and high specific resistance material.
In the structure of the present invention, an axial gap motor is employed as means for rotating the blade member. A sealing plate is provided between the magnet and the stator constituting the axial gap motor. Therefore, the non-magnetic material that is not affected by the magnetic leakage field of the magnet or the magnetic field of the stator is used, so that the blade member is efficiently rotated.
Moreover, since the sealing plate is made of a high specific resistance material, eddy currents are less likely to be generated when the axial gap motor is driven, so that heat generated by the eddy currents can be reduced.
As the material of the sealing plate, ceramic material, hard synthetic resin, and non-magnetic stainless steel or copper-based material can be adopted as the metal.

  In this invention, it is preferable that the said stator is comprised from a coil core and a coil, the outer periphery is resin-sealed, and the said housing | casing is sealed by mounting | wearing with the said stator.

In the structure of the present invention, the blade member is rotated by an axial gap motor. The stator that constitutes this axial gap motor is composed of, for example, a coil core formed of a magnetic material at the center and a coil wound around the coil core, and the outer periphery of the coil is sealed with resin. Therefore, the resin-sealed stator is press-fitted or adhesively fixed to the housing, thereby preventing liquid leakage.
Moreover, according to this structure, without using a member for sealing the casing, the casing can be sealed and liquid leakage can be prevented.

  In the present invention, the blade member includes a rotation shaft, a plurality of blades and magnets provided on the rotation shaft, and a ring-shaped stator on the outer periphery of the magnet. To do.

  In the structure of the present invention, a ring-shaped stator is provided on the outer periphery of the magnet as means for rotating the blade member. Such a structure is called a radial gap motor. In the radial gap motor, since thrust load is not applied in the axial direction of the rotating shaft, there is an effect that the wear of the bearing is small and the durability is improved.

  According to the present invention, the blade member is a plate-like member whose one end is fixed to the opposite side to the side where the solid light source of the casing is fixed, and the other end is reciprocally vibrated. It is characterized by being.

In such a structure, the blade member is, for example, a fan-shaped or strip-shaped plate member, and the other end is reciprocally vibrated, so that the casing to which the solid light source is fixed is forcibly convected. The liquid can be cooled efficiently.
Further, since the blade member is reciprocally vibrated, a compact cooling device can be configured with a simple structure.

  In the present invention, it is preferable that piezoelectric elements are fixed to both surfaces of the blade member, and the blade member is reciprocally vibrated by bending vibration of the piezoelectric element.

  In such a structure, since piezoelectric elements, for example, PZT (titanate-zirconate-lead) are fixed to both surfaces of the blade member, the piezoelectric elements are bent and vibrated by applying a current from the outside of the light source device. Due to the bending vibration of the piezoelectric element, the blade member is reciprocally oscillated with the amplitude enlarged following the vibration of the piezoelectric element. Therefore, the light source device can be efficiently cooled with a simple structure.

In the light source device of the present invention, it is desirable that the vibration member length of the blade member is 3 mm or more and 20 mm or less.
In addition, according to the present invention, the liquid is forcedly convected by the reciprocating vibration of the blade member, but in order to efficiently convect the liquid in the casing, the length of the vibrating portion is at least larger than the length of one side of the LED. Is larger than the length or diameter of one side of the substrate and is preferably larger than 1/2 of the height inside the housing. This makes it possible to provide a light source device that is compact and capable of efficient cooling.

  In the present invention, the blade member is a plate-like member, and the blade member supports a magnetic pole piece provided at an end portion inserted through the outside of the housing, and a midway in the longitudinal direction of the blade member, It is preferable that a hinge fixed to the housing and a pair of fixed magnetic poles at positions opposite to the magnetic poles of the magnetic pole pieces having an outer edge and a gap are provided, and the blade member is reciprocally vibrated. .

In such a structure, the fixed magnetic pole is, for example, an electromagnet in which a coil is wound around soft iron, and the blade member is a hinge that is attracted or repelled by applying a drive current from outside the housing. As a fulcrum, the cooling liquid is forcibly convected by the reciprocating vibration, and the light source device can be cooled efficiently.
This reciprocating vibration means also has an effect that the drive control circuit can be simplified.

  In the present invention, it is desirable that a concave portion is formed so that a part of the casing covers a magnetic pole piece provided on the blade member, and the casing is sealed.

In such a structure, since a part of the casing extends so as to cover the magnetic pole piece, the sealing structure is configured to include the entire blade member, so the movable part is mounted in the casing. As a result, leakage of the cooling liquid can be further prevented, and stable cooling performance can be maintained over a long period of time.
At this time, as will be described later, a separate sealing frame corresponding to the above-described concave portion is formed on the casing, and the casing can be sealed by being fixed to the casing so as to cover the magnetic pole pieces.

  The light source device of the present invention includes a solid-state light source, a substrate to which the solid-state light source is fixed, a casing to which the substrate is fixed and a liquid flows inside, and a blade provided inside the casing to be drivable A member and a liquid inlet and a liquid outlet provided in the housing are provided.

In such a structure, the casing is provided with a liquid inlet and a liquid outlet for allowing the cooling liquid to flow inside the casing, and the cooling liquid is provided outside the casing near the liquid inlet, for example, by a pump. It is established and forced to flow.
A vane member is provided inside the casing, and the flowed cooling liquid is forcibly agitated, so the liquid can be forced to flow and cool, so the vicinity of the cooling liquid inlet and the outlet The temperature of the housing can be made uniform, and all parts of the housing can be cooled uniformly.
At this time, for example, a centrifugal fan or an axial fan can be used as the blade member.

According to this invention, it is preferable that the said blade member has a some blade | wing formed radially, and the said blade member is provided with two or more.
In such a structure, the cooling liquid that has flowed in from the inflow port has an effect that the plurality of blade members are forcibly rotated and stirring of the faster flow is performed, so that the entire housing is uniformly cooled. .

In the light source device of the present invention, it is preferable that the rotation directions of the plurality of blade members are different.
As described above, since the plurality of blade members, particularly the adjacent blade members, have different rotational directions, the liquid around the blade member is more strongly stirred, so that the temperature of the liquid is made uniform. The temperature of the entire casing is made uniform, and the cooling effect is further enhanced.

  In the present invention, the blade member is a plate-like member whose one end is fixed to the sealing member of the casing and whose other end is reciprocally oscillated.

  In such a structure, the cooling liquid is forced to flow from the inlet to the outlet, but since the blade member provided in the casing is reciprocally vibrated, the liquid is forcibly agitated. Thus, the entire casing can be efficiently cooled.

In the present invention, it is conceivable that the substrate and the housing are integrally formed.
In such a structure, since the light source is directly fixed to the housing, a simple structure can be realized. In addition, the cooling effect can be further enhanced. The cooling effect can be further enhanced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1-12 shows the cooling structure of the light source device of this embodiment.

A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a cross-sectional view of the light source device according to the first embodiment. In FIG. 1, a light source device 1 is provided in a cooling case 31, which is a solid light source LED (light emitting diode) 11, an LED 11 is fixed, and a casing is filled with a cooling liquid 90. The blade member 51 is configured and integrated.

The cooling case 31 has a container shape in which the cooling liquid 90 can be accommodated, and the cooling case lid 22 is fixed to the upper opening of the cooling case 31 on the side to which the LED 11 is fixed (upward in the figure). Has been. Further, comb-shaped fins 35 for air cooling are formed on the outer peripheral portion of the cooling case 31 opposite to the cooling case lid 22. The inside of the cooling case 31 is formed in a continuous shape in a gentle arc shape so that the cooling liquid 90 can easily flow.
The cooling case 31 is made of an aluminum alloy, a magnesium alloy, or a copper alloy having high thermal conductivity. However, since the liquid is stored, stainless steel or the like can also be used.
A substantially trapezoidal convex portion 31 </ b> B is formed in the center of the inside of the cooling case 31.

A bearing 42 having a hole penetrating from the inside to the outside of the cooling case 31 is inserted into the central portion of the convex portion 31B, and the outside of the cooling case 31 of the convex portion 31B is a recess formed on a step. Is provided. The sealing plate 65 is adhered and fixed to the stepped portion outside the concave portion, and the cooling case lid 22 and the sealing plate 65 form a sealed space in the cooling case 31.
The sealing plate 65 is made of a nonmagnetic material such as synthetic resin, ceramic, nonmagnetic stainless steel, or copper-based metal.
The stator 61 is fixed to the outer surface (lower surface in the drawing) of the sealing plate 31 in the recess to which the sealing plate 65 of the cooling case 31 is fixed.

  Although not shown, the stator 61 is wound with a coil and is coated with a synthetic resin, and the planar shape of the stator 61 is substantially the same as that of the sealing plate 65. The coil is connected to an external control circuit.

The LED 11 is fixed to the metal substrate 21 by means such as adhesion, and is closely fixed to the cooling case lid 22. At this time, the substrate to which the LED 11 is fixed is a metal substrate, but is not limited to the metal substrate, and a synthetic resin having high heat resistance and high thermal conductivity can be employed.
The metal plate 21 has a hole formed in the lower side of the LED 11 from the inside of the cooling case 31 to the middle in the thickness direction, and a bearing 41 made of ceramic or the like is inserted into the hole.

Next, the structure of the blade member 51 will be described. In FIG. 1, the blade member 51 is provided with a rotating blade 44 at a substantially central portion in the longitudinal direction of the rotating shaft 43. The rotating shaft 43 passes through the bearing 42, and a magnet 45 is fixed to an end of the rotating shaft 43 so that the rotating center of the rotating shaft 43 coincides with the rotating center of the magnet 45.
The end of the rotating shaft 43 opposite to the magnet 45 is inserted into the bearing 41.
The magnet 45 and the stator 61 constitute an axial gap motor, and the magnet 45 is a permanent magnet that is magnetized to an even number of poles such as two poles, four poles, and six poles. It can be appropriately selected from the set rotational speed and the size including the stator.

  FIG. 2 is a front view showing a schematic shape of the rotary blade 44 constituting the blade member 51. In FIG. 2, the rotary blade 44 has a through hole 46 for mounting on the rotary shaft 43 in the center, and five blades 47 extend radially from the center. The blades 47 are made of metal and have a substantially rectangular cross section.

  In such a light source device 1, one side of the LED 11 has a side of 1 mm to 2 mm, and the substrate to which the LED 11 is fixed is often 8 mm in diameter or a square having a side of about 8 mm to 10 mm. Is 2 mm or more and 10 mm. At this time, in order to efficiently perform the convection of the liquid 90 in the cooling case 31, the diameter of the rotary blade 44 is 1/3 of the inner side of the housing, although it is also affected by the size of the inner side of the cooling case 31. It is preferable to be set in the range of ˜2 / 3.

  The rotary blade 44 is fixed to the rotary shaft 43 and is rotated along with the rotation of the rotary shaft 43. The size of the portion inserted into the bearings 41 and 42 of the rotating shaft 43 is preferably set to a size that is 1 mm or less to reduce friction and to maintain the structural strength during rotation.

When a current is applied to the stator 61 from an external drive control circuit (not shown), the magnet 45, the rotating shaft 43, and the rotating blade 44 are integrally rotated in synchronization with the stator 61, and the centrifugal force generated by the rotation of the rotating blade 44 is obtained. Thus, the cooling liquid 90 is forcedly convected from the center of the rotary blade 44 toward the outer periphery as shown by the arrow in the figure, and the heat of the LED 11 is conducted to the cooling liquid 90 via the cooling case lid 22 and cooled. Is done.
The cooling liquid 90 flows along the inner surfaces of the cooling case lid 22 and the cooling case 31, heat is conducted to the fins 35 provided in the cooling case 31, and heat is radiated from the fins 35 to the air.

  Heat can be promoted by applying air to the fins 35 from the outside with a cooling fan (not shown).

Therefore, according to the first embodiment, the cooling liquid is forcibly convected along the inner surface of the cooling case 31 through which the heat generated from the LEDs 11 is conducted, so that highly efficient cooling can be performed.
In addition, the cooling liquid 90 in which heat is conducted from the LED 11 is transmitted to the cooling case 31 and radiated in the process of forced convection, but is radiated into the air from the fins 35 provided in the cooling case 31. The cooling effect is further enhanced.
Thus, since efficient cooling can be performed, the brightness | luminance of LED11 can be raised and deterioration of a solid light source by the temperature rise can be prevented.
According to the present invention, the rotating shaft 43 is provided with a plurality of blades 47, and the rotating shaft 43 includes a magnet 45 and a stator 61 (such as a magnet) provided to face the end face of the magnet 45. Since the stator is rotated by an axial gap motor), the blade member 51 is efficiently rotated and the cooling effect can be enhanced.

  In addition, since the sealing plate 65 is provided between the magnet 45 and the stator 61, the cooling liquid 90 is prevented from leaking out of the cooling case 31, and the cooling performance of the light source device 1 is maintained for a long period. can do. Since the sealing plate 65 is made of a non-magnetic material, it is transmitted to the magnet 45 without interfering with the rotating magnetic field from the stator 61, so that the rotating blades 44 can be efficiently rotated, thereby increasing the cooling effect. be able to.

A second embodiment of the present invention will be described with reference to FIG.
FIG. 3 shows a cross section of the light source device 1 according to the present invention. In particular, the structure relates to the sealing structure of the cooling case 31 by the stator 61, and the other structures are the same as those in the first embodiment, so that the description thereof is omitted. The reference numerals in the figure are also given in the same way. In FIG. 3, the stator 61 is not shown, but the coil is wound, the surface is covered with a synthetic resin, and the outer shape is formed to be substantially the same as the inner shape of the outer stepped portion of the cooling case 31. Yes.
The cooling case 31 is hermetically sealed by press-fitting or fixing the stator 61 to the cooling case 31.

  Therefore, according to the second embodiment, since the cooling case 31 is sealed by the stator 61, it is possible to prevent the cooling liquid 90 from leaking without providing a sealing plate or the like for sealing. Further, since the distance between the magnet 45 and the stator 61 can be reduced, the rotating magnetic field of the stator 61 can be transmitted to the magnet 45 with little loss, so that the blade member 51 can be efficiently rotated and the cooling effect can be achieved. Can be increased.

A third embodiment of the present invention will be described with reference to FIG.
FIG. 4 shows a cross section of the light source device 1 according to the third embodiment of the present invention. The third embodiment is a light source device that employs a radial gap motor as a means for rotating the blade member 52. The structure other than the periphery of the radial gap motor is the same as that of the first embodiment. The same reference numerals as those in FIG. 1 are given.

In FIG. 4, the LED 11 is fixed to the metal substrate 21, and the metal substrate 21 is fixed to the upper surface of the cooling case lid 22. The cooling case 32 is hermetically sealed after the cooling liquid 90 is filled with the cooling case lid 22. A fin 35 for heat dissipation is provided on the back surface of the cooling case 32 opposite to the LED 11.
The inner surface of the cooling case 32 is formed in a continuous shape with a smooth arc so that the liquid 90 can easily flow.

A hole that does not penetrate the bottom is formed in the substantially center of the bottom of the cooling case 32, and a bearing 42 made of ceramic is inserted into the hole so that the bearing 42 is substantially concentric with the center of the bearing 42. A ring-shaped stator 62 surrounding the periphery of the cooling case 32 is fixed to the bottom surface of the cooling case 32.
A hole that does not penetrate the cooling case lid 22 is formed in a substantially central portion of the cooling case lid 22, and a bearing 41 made of ceramic is inserted. End portions of the rotating shaft 43 of the blade member 52 are inserted into shaft hole portions of the bearings 41 and 42, and are supported rotatably.

The blade member 52 includes a rotating shaft 43, a rotating blade 44, and a magnet 48. The rotary blade 44 is inserted in the axial direction of the rotary shaft 43 in the vicinity of the cooling case lid 22 so as not to contact the bearing 41, and the magnet 48 is inserted in a ring space of the stator 62 so as not to contact the bearing 42. It is worn.
The stator 62 has a coil (not shown) wound in a ring shape, and the periphery is also sealed in a ring shape with a synthetic resin. A terminal connected to a drive control circuit (not shown) provided outside the cooling case 32 is provided from the coil. The outer shape of the stator 62 is set to a shape that is substantially trapezoidal in cross section as viewed in FIG. 4 and is continuous from the bottom of the cooling case 32 in which the cooling liquid 90 is easy to flow.

  A radial gap motor is constituted by the magnet 48 and the stator 62, and the magnet 48, the rotating shaft 43, and the rotating blade 44 are moved by a rotating magnetic field generated in the stator 62 by a driving current from an external drive control circuit (not shown). The cooling liquid 90 is forcedly convected by rotating together. The cooling liquid 90 flows in the direction of the arrow in the figure, and heat generated by the LEDs 11 is sequentially conducted to the cooling liquid 90, the cooling case 32, and the fins 35 to be radiated into the air.

Therefore, according to the third embodiment, the rotary vane 44 is rotated by the radial gap motor constituted by the magnet 48 and the stator 62, so that the axial load is not applied to the rotary shaft 43, so that the wear of the bearing is reduced. Thus, the cooling liquid 90 is forcedly convected stably over a long period of time, and the cooling effect can be maintained.
Further, since the sealed portion is only the joint portion of the cooling case lid 22, leakage of the liquid 90 can be prevented.

Next, a fourth embodiment of the light source device 1 according to the present invention will be described with reference to FIGS. The fourth embodiment is a light source device that employs a blade member 70 that reciprocally vibrates as a means for forced convection of the cooling liquid 90. The light source device is the same as the first embodiment except for the blade member 70 and its fixed portion structure, and has the same function and shape. These constituent members are also given the same reference numerals.
FIG. 5 shows a cross section of the light source device 1 of the fourth embodiment, and FIG. 6 shows an enlarged cross section of a main part of the blade member 70.

In FIG. 5, a sealing member 75 is inserted in a substantially central portion on the bottom portion facing the surface on which the LED 11 is provided inside the cooling case 33. A blade member 70 is fixed to a substantially central portion of the sealing member 75. The configuration of the blade member 70 will be described in detail with reference to FIG.
Although not shown, the piezoelectric elements PZT 72 and 73 have electrodes formed on the surface and connected to an external drive control circuit.
When a potential is applied from the external drive control circuit, the PZTs 72 and 73 are alternately expanded and contracted to bend and vibrate. As a result, the blade 71 is similarly reciprocated in the direction of arrow A. The blade 71 is reciprocally oscillated, the cooling liquid 90 is forcedly convected in the direction of the arrow in the figure, and the heat conducted from the LED 11 is radiated into the air through the cooling case 33 and the cooling fin 35.

FIG. 6A shows a main part enlarged cross section showing the blade member 70 and its fixing structure, and FIG. 6B shows a main part enlarged cross section showing another modification of the fixing structure. In FIG. 6A, the blade 71 is a plate-like member formed of metal, and is formed in a strip shape or a shape in which the side to be vibrated spreads out in a fan shape. PZTs 72 and 73 are affixed to both sides of the blade 71 in the vicinity of a range that does not come into contact with the sealing member 75, and a through hole having substantially the same shape as the cross-sectional shape of the fixed portion of the blade member 71 provided in the sealing member 75 It is inserted and adhered to.
The sealing member 75 is inserted and fixed from the outer rear surface of the cooling case 33, and the cooling case 33 forms a sealed space by the cooling case lid 22 (see FIG. 5) and the sealing member 75.

  In FIG. 6B, the insertion hole 76 of the blade 71 provided in the sealing member 75 is formed in a range not penetrating the sealing member 75, and the blade 71 in which PZTs 72 and 73 are attached to the insertion hole 76. Is installed.

  In the blade 71 described above, the length of the vibrating portion is set in a range of 3 mm to 20 mm, but is adjusted by the size and shape of the internal space of the cooling case 33, but is approximately 2/3 of the thickness of the internal space. It is preferable to set to.

Therefore, according to the fourth embodiment, the cooling liquid 90 in the cooling case 33 is agitated and forcedly convected by the reciprocating vibration of the blades 71, so that the same effect as in the first embodiment can be obtained.
Further, since the blade 71 is driven by the PZTs 72 and 73, the structure is simpler than that of the blade members 51 and 52 driven by the axial gap motor and the radial gap motor described in the first and third embodiments. Thus, there is an effect that the light source device 1 can be downsized.
Further, in the structure shown in FIG. 6B, since the blade member 71 does not penetrate the sealing member 75, the number of places where the liquid 90 can leak is reduced, and the cooling performance can be maintained over a long period of time.

Next, a fifth embodiment of the light source device 1 according to the present invention will be described with reference to FIGS. The fifth embodiment relates to a support structure and a drive structure of the blade member 81, the description of the common parts with the fourth embodiment is omitted, and members having the same function and the same shape are given the same reference numerals.
FIG. 7 is a cross-sectional view of the light source device 1 according to the fifth embodiment, and FIG. 8 is a main-part cross-sectional view showing a modification of the support structure for the blade member 81.

In FIG. 7, a sealing member 88 is inserted in a substantially central portion on the bottom portion facing the surface on which the LED 11 is provided inside the cooling case 33. The outer peripheral portion of a hinge 82 such as a bellows on which the blade member 81 is supported is fixed to a substantially central portion of the sealing member 88, and the cooling case 33 is sealed.
The hinge 82 includes a support portion 82A that supports the blade member 81 and a fixing portion 82B that is fixed to the cooling case 33. The hinge 82 is formed in a substantially U-shaped cross-section, and is fixed by bonding or welding at the fixing portion 82B. Thus, the cooling case 33 is hermetically fixed. The hinge 82 is preferably formed of a highly elastic and nonmagnetic material.

  In addition, the end portions of the pair of fixed magnetic poles 84 and 86 that have a gap and are opposed to each other in the plane direction are fixed to a recess formed outside the cooling case 33 to which the sealing member 88 is fixed. Coils 85 and 87 are wound around the fixed magnetic poles 84 and 86, and the fixed magnetic poles 84 and 86 and the coils 86 and 87 constitute a pair of electromagnets. The terminals of the coils 85 and 87 are not shown, but are connected to an external drive control circuit.

The blade member 80 includes a strip-shaped or fan-shaped plate-shaped blade 71 and a magnetic pole piece 83 made of a soft magnetic material fixed to the outer end of the cooling case 33 of the blade 71.
The blade 71 is inserted into the hinge 82 at the center, and is supported with the swing center of the hinge as a fulcrum. At this time, the blade 71 and the support portion of the hinge 82 are in close contact with each other.
The magnetic pole piece 83 fixed to the end of the blade 71 is disposed at a position having a gap between the fixed magnetic poles 84 and 86 described above.
The length of the blade member 81 is not particularly limited, but the ratio of the length from the fulcrum of the hinge 82 to the magnetic pole piece 83 and the length from the fulcrum to the tip on the opposite side of the magnetic pole piece is about 1: 5. It is preferable to set to.

In FIG. 8A, the blade member 81 is inserted into the bottom of the cooling case 33, and a recessed portion 31 </ b> A that protrudes so as to cover the magnetic pole piece 83 is formed. The fixed magnetic poles 84 and 86 are wound around the coils 85 and 87 adjacent to the outer edge of the recess 31 </ b> A and are fixed to the cooling case 33.
FIG. 8B is a cross-sectional view of FIG. 8A viewed from the arrow B direction. 8B, a pair of protrusions 77 are formed on both sides of the swing fulcrum of the blade 71, and the blade member corresponds to the shape of the protrusion 77 in the recess 31A of the cooling case 33. A pair of support portions sized such that 81 can swing is formed.
At this time, the recessed portion 31A of the cooling case 33 has a size in the range in which the vane member 81 can swing in the direction of the opposed fixed magnetic poles 84 and 86, and the width direction in a range in which the blade 71 and the magnetic pole piece 83 do not contact each other. .

  In the fifth embodiment, the cooling case 33 has a high thermal conductivity and a nonmagnetic material is used. For example, an aluminum alloy, a magnesium alloy, a copper alloy, a nonmagnetic stainless steel, or the like is preferable.

  Next, driving of the blade member 81 will be described. When a drive current is alternately applied to the fixed magnetic poles 84 and 86 from a drive control circuit (not shown), the fixed magnetic poles 84 and 85 are electromagnets, so that the magnetic pole pieces 83 are alternately attracted and repelled repeatedly. However, it is swung around the support portion 82A of the hinge 82 or the support portion 77 as a fulcrum. Then, the blade 71 in the cooling case 33 is swung in the direction of the arrow A with the amplitude enlarged, the cooling liquid 90 is stirred, and the temperature of the cooling liquid 90 is equalized, whereby the light source device 1 is cooled. .

Therefore, according to the fifth embodiment, the cooling liquid 90 in the cooling case 33 is agitated and forcedly convected by the swinging (reciprocating vibration) of the blade 71, so that the same effect as in the fourth embodiment can be obtained.
Further, since the fixed magnetic poles 84 and 86 are electromagnets, the blade member 81 has an effect that the external drive control circuit can be simplified.
In the structure as shown in FIG. 8B described above, a hinge or the like for supporting the blade member 81 is not required, the structure is simple, and the cooling case 33 is continuously formed by the recess 31A. There is no leakage of the cooling liquid 90 from this portion.
Further, instead of the recess 31A, a dedicated sealing frame corresponding to the shape of the recess 31A can be provided separately, and the cooling case 33 can be sealed by means such as welding. At this time, the sealing frame is preferably made of a nonmagnetic material.

Next, a sixth embodiment of the light source device 1 according to the present invention will be described with reference to FIG.
FIG. 9 shows a cross section of the light source device 1 of the sixth embodiment. In FIG. 9, the cooling case 34 is provided with an inflow port 36 into which the cooling liquid 90 flows on one side surface, and an outflow port 37 through which the cooling liquid 90 is discharged from the cooling case 34 on the side surface facing the inflow port 36. Is provided.
Further, a bearing 42 made of ceramic, a sealing plate 65, and a stator 61 are provided on the bottom portion of the cooling case 34 that faces the surface to which the LED 11 is fixed. 1), the description is omitted.

The blade member 53 includes a rotating shaft 43, a propeller-shaped blade 49, and a magnet 45. The blade member 53 is an axial fan. In the blade member 53, a rotary shaft 43 is rotatably inserted into a ceramic bearing 41 fixed to the cooling case lid 22 and a bearing 42 fixed to the bottom of the cooling case 34.
As described above, the axial gap motor is constituted by the magnet 45 fixed to the end of the rotating shaft 43 and the stator 61.
In addition to the axial gap motor, the radial gap motor described in the third embodiment (see FIG. 4) may be employed.

A pump (not shown) is provided near the inlet 36 outside the cooling case 34, and the cooled cooling liquid 90 is sent into the cooling case 34. The cooling liquid 90 is directly sprayed onto the cooling case lid 22 by rotating the magnet 45, the rotating shaft 43, and the blades 49 together. The cooling liquid 90 agitated by the blades 49 is discharged to the outlet 37, cooled, sent to the pump and circulated.
The cooling liquid 90 in the cooling case 34 is forcibly stirred in the direction of the arrow in the figure.

  Therefore, according to the sixth embodiment, since the blades 49 are forcibly rotated, the cooling liquid 90 is rapidly stirred in the cooling case 34. Further, since the blades 49 are axial fans, the cooling liquid 90 is directly applied to the cooling case lid 22 which is a member to be cooled. By these things, while LED is cooled, the temperature in the cooling case 34 is cooled uniformly, and the cooling effect is further enhanced.

Next, Example 7 of the light source device 1 of the present invention will be described with reference to FIG.
FIG. 10 shows a cross section of the light source device 1 of the seventh embodiment. In FIG. 10, an inflow port 38 into which the cooling liquid 90 for cooling is introduced is provided on one side surface of the cooling case 34, and an outflow port 39 through which the cooling liquid is discharged is provided on the side surface facing the inflow port 38. Yes.
Two rotating shafts 89 that are rotatably supported across the inside of the cooling case 34 are provided in the central portion of the cooling case 34 in the height direction. The blade 81 is fixed.

  Although not shown, these blades 81 include an axial gap motor and a radial gap motor as in the first embodiment (see FIG. 1) and the third embodiment (see FIG. 4), and two rotating shafts 89. And the blade 81 are integrally rotated. At this time, the adjacent blades 81 are reversely rotated.

  A pump (not shown) is provided in the vicinity of the inlet 38 outside the cooling case 34, and the cooling liquid 90 is sent into the cooling case 34. The cooling liquid 90 is forcibly stirred by the blades 81, discharged to the outlet 39, cooled, sent to the pump and circulated.

  Therefore, according to the seventh embodiment, the cooling liquid 90 is forcibly agitated by the two blades 81, and these blades 81 are reversely rotated with each other, so that they are agitated more strongly. The temperature becomes uniform quickly and the cooling effect is enhanced.

  In addition, although the cooling fin is not provided in the cooling case 34 of Example 6 and Example 7, if the fin for cooling is provided, a cooling effect will be improved further.

Next, an eighth embodiment of the light source device 1 according to the present invention will be described with reference to FIG.
FIG. 11 shows a cross section of the light source device 1 of the eighth embodiment. In FIG. 11, the cooling case 33 is formed with a sealed space by the cooling case lid 22. As described in the seventh embodiment, the cooling case 33 has two rotating shafts that are rotatably supported across the inside of the cooling case 33 at the substantially central portion in the height direction inside the cooling case 33. 89 is provided, and blades 81 are fixed to substantially the center of the rotation shaft 89, respectively.

  Although not shown, these blades 81 are provided with an axial gap motor and a radial gap motor as in the first embodiment (see FIG. 1) and the third embodiment (see FIG. 4). Are rotated together. At this time, the adjacent blades 81 are reversely rotated.

Therefore, according to the eighth embodiment, the liquid 90 is forcibly agitated by the two blades 81, and these blades 81 are reversely rotated with each other, so that the liquid 90 is more strongly agitated. The temperature becomes fast and uniform, and the cooling effect is enhanced.
In addition, since the cooling case 35 is provided in the cooling case 33, since the heat in the cooling case 33 is radiated into the air via the fins 35, the cooling effect is further enhanced.
Although not shown, if the fins 35 are blown and cooled by another fan, the cooling effect is further enhanced.

Next, a ninth embodiment of the light source device 1 according to the present invention will be described with reference to FIG. The ninth embodiment is the light source device 1 in which the cooling case 33 of the fourth embodiment is provided with the inlet and outlet of the cooling liquid 90.
FIG. 12 shows a cross section of the light source device 1 of the ninth embodiment. In FIG. 12, an inlet 36 for the cooling liquid 90 is provided on one side of the cooling case 33, and an outlet for the cooling liquid is provided on the opposite side. Since the configuration of the blade member 70 and the mounting portion structure are the same as those in the fourth embodiment, the description thereof is omitted.

  In the ninth embodiment, since the cooling liquid 90 is cooled and sent into the cooling case 33 from the inlet 36 and is forcibly stirred by the reciprocating vibration of the blade member 70, the cooling effect is further enhanced.

In the light source device 1 of the present invention, in the above-described embodiment, the metal substrate 21 to which the LED 11 is fixed is fixed to the cooling case lid 22, and the cooling case lid 22 is closely fixed to the upper opening of the cooling case 31. The LED 11 can be directly fixed to the cooling case lid 22 that seals the housing by means such as adhesion.
In such a structure, since the LED 11 is directly fixed to the housing, a simple structure can be realized. In addition, the cooling effect can be further enhanced.
The fixed metal substrate 21 is fixed to the cooling case lid 22, and the cooling case lid 22 is closely fixed to the upper opening of the cooling case 31. It can be fixed by the means.
In such a structure, since the LED 11 is directly fixed to the housing, a simple structure can be realized. In addition, the cooling effect can be further enhanced.

In addition, this invention is not limited to the above-mentioned Example, The deformation | transformation in the range which can achieve the objective of this invention, improvement, etc. are included in this invention.
For example, in the first to eighth embodiments, the number of LEDs 11 as a solid light source is one, but a plurality of LEDs 11 may be used. In this case, the type, quantity, and driving of the blade member of each of the embodiments described above. The object of the present invention can be achieved by appropriately selecting the means.

  As described above, the present invention effectively cools the solid light source by forcibly convection the cooling liquid in the cooling case to which the solid light source is fixed, using the blade member, increases the brightness of the solid light source, and improves the performance over a long period of time. A light source device that can be maintained can be provided.

  As an application example of the present invention, it can be applied to a projection display device such as a projector. Moreover, the cooling structure of the light source device of the present invention can be used for an electronic device including a heat source other than the light source, such as a semiconductor device.

Sectional drawing which shows the light source device concerning Example 1 of this invention. The front view which shows the blade | wing member of Example 1 of this invention. Sectional drawing which shows the light source device concerning Example 2 of this invention. Sectional drawing which shows the light source device concerning Example 3 of this invention. Sectional drawing which shows the light source device concerning Example 4 of this invention. FIG. 9 is a cross-sectional view of a main part showing a blade member of Example 4. Sectional drawing which shows the light source device concerning Example 5 of this invention. FIG. 10 is a cross-sectional view of a main part showing a modified example of the fifth embodiment. Sectional drawing which shows the light source device concerning Example 6 of this invention. Sectional drawing which shows the light source device concerning Example 7 of this invention. Sectional drawing which shows the light source device concerning Example 8 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Light source device 11 ... Solid light source (LED)
21 ... Metal substrate 22 ... Cooling case lid 31 ... Cooling case 51 ... Blade member 90 ... Cooling liquid

Claims (16)

A solid light source, and a substrate to which the solid light source is fixed;
A housing to which the substrate is fixed and a cooling liquid is sealed inside;
A blade member provided inside the housing so as to be drivable;
A light source device comprising: The light source device according to claim 1,
The blade member includes a rotation shaft and a plurality of blade portions provided on the rotation shaft,
One end of the rotating shaft is inserted into the housing, and a magnet fixed to the end portion;
A stator is provided at a position facing the gap with a gap in the direction of the end face of the magnet,
A sealing plate between the magnet and the stator, wherein the magnet is sealed at a position having a gap with the magnet;
A light source device comprising: The light source device according to claim 1 or 2,
The light source device, wherein an outer diameter of the blade portion is 2 mm or more and 10 mm or less. The light source device according to claim 2,
The light source device, wherein the sealing plate is made of a nonmagnetic and high specific resistance material. The light source device according to claim 2,
The stator is composed of a coil core and a coil, and its outer periphery is resin-sealed,
The light source device, wherein the housing is sealed by mounting the stator. The light source device according to claim 1,
The blade member includes a rotation shaft, a plurality of blades provided on the rotation shaft, and the magnet.
A light source device further comprising a ring-shaped stator provided on an outer periphery of the magnet. The light source device according to claim 1,
The blade member is a plate-like member whose one end is supported on the opposite side to the side to which the solid-state light source of the casing is fixed, and the other end is reciprocally vibrated. Light source device. In the light source device according to claim 1 or 7,
A light source device, wherein a piezoelectric element is fixed to both surfaces of the blade member, and the blade member is reciprocally vibrated by bending vibration of the piezoelectric element. The light source device according to claim 1, claim 7, or claim 8,
The light source device characterized in that a vibration part length of the blade member is 3 mm or more and 20 mm or less. In the light source device according to claim 1 or 7,
The blade member is a plate-shaped member, and a pole piece provided at an end portion where the blade member is inserted outside the housing;
A hinge that supports the blade member in the longitudinal direction and is fixed to the housing;
A pair of fixed magnetic poles at positions opposite to the magnetic poles of the magnetic pole pieces having an outer edge and an air gap of the magnetic pole pieces;
The light source device, wherein the blade member is reciprocally vibrated. The light source device according to claim 1 or 10,
A recess is formed so that a part of the housing covers the magnetic pole piece provided on the blade member,
The light source device, wherein the casing is sealed. A solid light source, and a substrate to which the solid light source is fixed;
A housing to which the substrate is fixed and a cooling liquid flows inside;
A blade member provided inside the housing so as to be drivable;
A liquid inlet and a liquid outlet provided in the housing;
A light source device comprising: The light source device according to claim 12,
The blade member has a plurality of radially formed blades,
A light source device comprising a plurality of the blade members. The light source device according to claim 12 or 13,
The light source device, wherein the plurality of blade members have different rotation directions. The light source device according to claim 12,
The light source device according to claim 1, wherein the blade member is a plate-like member having one end fixed to the sealing member of the casing and the other end reciprocally vibrated. The light source device according to claim 1 or 12,
The light source device, wherein the substrate and the housing are integrally formed.

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