JP4569454B2 - Light source device and projector - Google Patents

Description

  The present invention relates to a light source device that illuminates a light valve of a projector and a projector including the light source device.

  In the projection method of the projector, in addition to the conventional three-plate transmission type liquid crystal method, a single-plate field sequential method using MEMS or the like as a light valve has been used in recent years. Since this single-plate field sequential projector has fewer parts than a three-panel transmissive liquid crystal projector, it can be easily reduced in size and price. In addition, MEMS is used as a light valve, and it is possible to obtain a high-contrast image because the unnecessary light is spatially separated to create a projected image, and because it does not use organic substances such as liquid crystal and alignment film, it has a long life. Due to its characteristics, it is spreading.

  A conventional light source device used in a single-plate field sequential projector is, for example, a light-emitting tube and a concave reflection that holds the light-emitting tube and reflects light emitted from the light-emitting tube and emits it in the optical axis direction. A mirror, a front glass holder attached to the opening of the concave reflecting mirror, a front glass that is held by the front glass holder and covers the opening that is the front of the concave reflecting mirror, and an ultraviolet component of a light beam emitted from the front glass It comprises an ultraviolet filter for cutting, a rotary color filter for performing color separation and time resolution of the light beam, and a light density uniformizing means for entering the light beam converged by the concave reflecting mirror and emitting light of substantially uniform intensity. The light emitted from the arc tube reaches the front glass directly or after being reflected by the concave reflecting mirror, and is transmitted to the outside through the ultraviolet filter, the rotary color filter, and the light density equalizing means.

The arc tube is a discharge lamp such as a short arc type ultra-high pressure mercury lamp composed of a tube portion and a cylindrical sealing portion formed at both ends of the tube portion. appear. The inner space of the tube part contains mercury and a small amount of halogen.
The sealing portion includes a tungsten electrode protruding into the inner space of the tube portion, a molybdenum foil connected to the electrode, and an external electrode connected to the molybdenum foil and protruding outward from the end of the sealing portion. Among the external electrodes of both sealing parts, the front end side lead wire connected to the front end side external electrode close to the front glass is constituted.

  Since the distal end side external electrode and the distal end side lead wire are located on the optical axis, they are easily irradiated with return light from the rotary color filter and interface reflected light from optical elements such as a front glass and an ultraviolet filter. As a result, the temperature of the distal end side external electrode and the distal end side lead wire rises, and the oxidation is accelerated, which may cause defects such as shortening of the life of the light source device and destruction.

  In order to prevent the temperature increase of the distal end side external electrode and the distal end side lead wire as described above, the method described in Patent Document 1 is applied, and an optical element serving as a reflective interface, for example, a rotary color filter is attached to the optical axis. By tilting, the return light from the rotary color filter that irradiates the tip side external electrode and the tip side lead wire can be reduced.

  Further, an arrangement in which the rotary color filter and the light density equalizing means are arranged in this order from the side closer to the front end side external electrode and the lead end side lead wire is arranged as described in Patent Document 2, the light density equalizing means and the rotary color filter. If the order of the filters is changed, the return color light from the rotary color filter that irradiates the tip side external electrode and the tip side lead wire can be reduced by moving the rotary color filter away from the tip side external electrode and the tip side lead wire. .

  Furthermore, the method of cooling the arc tube by introducing the cooling air into the concave reflecting mirror proposed in Patent Document 3 is applied to increase the rotational speed of the intake fan that feeds the cooling air, or to the cooling air inlet By making the nozzle shape into a nozzle shape, it is also possible to locally increase the cooling air speed to cool the tip side external electrode and the tip side lead wire, thereby preventing the temperature from rising.

JP 2002-277820 A (page 4, FIG. 1) JP 2004-233940 A (FIG. 1) Japanese Patent Laying-Open No. 2005-173085 (page 4, FIG. 1)

  However, when the optical element at the interface such as a rotary color filter is tilted as described in Patent Document 1, the light source device is increased in size. Further, since the projection of the light flux on the rotary color filter becomes large, it is necessary to enlarge the rotary color filter in order to maintain the color separation ability. Furthermore, since the optical path length increases as the size of the light source device increases, the light use efficiency decreases.

  Moreover, if the arrangement of the rotary color filter and the light density uniformizing means is exchanged as described in Patent Document 2, the light source device is increased in size and the light utilization efficiency is reduced accordingly. Further, since unnecessary light is incident on the light density uniformizing means without being cut by the rotary color filter, a new problem that heat generation of the light density uniformizing means increases occurs. When the calorific value increases, it becomes difficult to use a light pipe with a mirror attached to the light density uniformizing means, so a glass rod is usually used. There is a possibility that dust or the like adheres to the incident surface and the light use efficiency decreases.

  Furthermore, when the tip side external electrode and the tip side lead wire are cooled by applying the method described in Patent Document 3, the cooling air that has cooled the tip side external electrode and the tip side lead wire reaches the concave reflecting mirror. It flows along the inner wall surface and further reaches the tube part. Ideally, the tube portion should be kept at an appropriate constant temperature. However, a portion of the tube portion is cooled by the cooling air that has reached the tube portion 111 after cooling the tip-side external electrode and the tip-side lead wire. May be overcooled. On the other hand, depending on the wind direction and wind speed, there is a possibility that the cooling air that is turbulent and irregular in the concave reflecting mirror reaches the tube part. In this case, a part of the tube part may be insufficiently cooled. is there. Problems that occur when the tube section is supercooled and when the cooling is insufficient will be described below.

An ultra-high pressure mercury lamp mainly used as an arc tube contains a small amount of halogen in order to prevent the tungsten electrode from evaporating and adhering to the bulb portion during discharge. Here, when the wall surface of the tube bulb portion becomes low temperature due to the supercooling of the tube bulb portion, the halogen activity is reduced and the halogen cycle becomes defective, and the electrode material adheres to the inner wall of the tube bulb portion and the tube bulb portion becomes black. There is a case. On the other hand, when the wall surface of the tube bulb portion becomes high due to insufficient cooling of the tube bulb portion, the inner wall surface is recrystallized and the light transmittance is deteriorated, so that the amount of emitted light flux is reduced. In this way, overcooling or undercooling of the bulb part shortens the life of the arc tube by accelerating electrode wear or reducing the light transmittance of the bulb part. It is desirable to maintain a proper temperature.
Furthermore, in recent years, the pressure of mercury vapor in the arc tube has been increased for the purpose of improving the brightness. However, due to the large amount of mercury enclosed, unvaporized mercury is generated if there is a low-temperature part inside the tube part. As a result, the luminous efficiency may be reduced, and defects such as arc destabilization may occur.
As described above, the tube portion needs to maintain an appropriate temperature.

  The present invention has been made to solve the above-described problems, and does not cause an increase in the size of the light source device or a decrease in light utilization efficiency, and can appropriately cool the bulb portion of the arc tube. The object is to obtain a light source device with good quality.

  The light source device according to the present invention includes a pair of first electrode portions having a space where one surface is open, the opening of the concave surface portion having a curved region for reflecting light is covered with a transparent material, and arranged opposite to the tube portion. The first electrode portion of the arc tube having the second electrode portion is disposed at the center of the bottom surface of the concave portion, and the first cooling air directed to the tip of the second electrode portion is supplied to the first cooling air inlet. From the first cooling air inlet, and the second cooling air directed to the first cooling air flowing from the first cooling air inlet and cooling the tip of the second electrode portion is introduced from the second cooling air inlet. And

  According to the present invention, it is possible to obtain a light source device with good light emission efficiency that can appropriately cool the bulb portion of the arc tube without causing an increase in size of the light source device and a decrease in light utilization efficiency.

Embodiment 1 FIG.
1 is a side view of a light source device according to Embodiment 1 of the present invention as viewed from the horizontal direction. In FIG. 1, a direction parallel to the optical axis in the left and right direction with respect to the paper surface is defined as an X direction, a vertical direction with respect to the paper surface is defined as a Z direction, and a direction perpendicular to the paper surface is defined as a Y direction.
The light source device in FIG. 1 includes an arc tube 110, a concave reflecting mirror 120 that holds the arc tube 110 inside, reflects light emitted from the arc tube 110, and emits the light in the optical axis direction, and concave reflection. Front glass holder 140 attached to the opening of mirror 120, front glass 130 that is held by front glass holder 140 and covers the opening that is the front surface of concave reflecting mirror 120, and cooling airflow installed in front glass holder 140 It consists of an inlet member 1.
In FIG. 1, for convenience of explanation, only the concave reflecting mirror 120 can be seen through, and the inside of the concave reflecting mirror 120 is shown. A dotted arrow indicates the flow of the cooling air flowing into the concave reflecting mirror 120 from the cooling air inlet member 1.

  The concave reflecting mirror 120 is a rotating ellipsoidal mirror having an elliptical cross section in the XZ plane, and is made of crystallized glass or heat resistant glass. A dielectric multilayer film that reflects only visible light in the optical axis direction and transmits light other than visible light is deposited on the inner wall surface of the concave reflecting mirror 120.

  Front glass 130 is made of heat-resistant glass, and is held by front glass holder 140 so as to close the opening of concave reflecting mirror 120. The front glass 130 acts as a transparent material, transmits light emitted from the arc tube 110 and light reflected by the concave reflector 120, and protects the arc tube 110 and concave reflector 120 from the outside. Moreover, the diameter in the YZ plane of the front glass 130 is a magnitude | size equivalent to the opening part of the concave reflective mirror 120, and is about 60-90 mm.

The front glass holder 140 is made of a high heat-resistant flame-retardant resin containing glass fiber, an aluminum alloy, a magnesium alloy, or the like, and is engaged with the opening of the concave reflecting mirror 120. The front glass holder 140 is provided with a cooling air inlet 141, and the cooling air inlet member 1 is attached to the cooling air inlet 141. The cooling air inlet 141 is provided closer to the front glass 130 than the bulb portion 111 of the arc tube 110, but may be provided closer to the center of the bottom surface of the concave reflecting mirror 120 than the bulb portion 111. good.
The concave reflecting mirror 120 and the front glass holder 140 correspond to a concave surface portion, and the cooling air inlet 141 corresponds to a first opening formed in the concave surface portion.

In FIG. 1, the front glass holder 140 is engaged with the concave reflecting mirror 120 and the front glass 130 is attached to the front glass holder 140, but the front glass holder 140 may not be used. In that case, the concave reflecting mirror 120 may directly hold the front glass 130 and the cooling air inlet 141 may be provided in the concave reflecting mirror 120.
Further, the concave reflecting mirror 120 and the front glass holder 140 may be integrated to hold the front glass 130.

FIG. 2 is a cross-sectional view taken along line AA of the ultrahigh pressure mercury lamp used as the arc tube 110 in FIG. In FIG. 2, the arc tube 110 is made of quartz glass, and cylindrical sealing portions 112 and 113 are formed at both ends of the tube portion 111. The tube portion 111 is arranged so as to be positioned at the focal point of the concave reflecting mirror 120, but the sealing portions 112 and 113 are fixed to the concave reflecting mirror 120, so that the arc tube 110 is in the internal space 121 of the concave reflecting mirror 120. To be established. Molybdenum foils 14 and 15 are sealed in the sealing portions 112 and 113. A backside external electrode 16 and a backside internal lead 19 are connected to the molybdenum foil 14, a tungsten electrode 12 is connected to the backside internal lead 19, and a front end side external electrode 17 and a molybdenum foil 15 are connected to the molybdenum foil 14. A tip side internal lead 20 is connected, a tungsten electrode 13 is connected to the tip side internal lead 20, and a tip side lead wire 18 is connected to the tip side external electrode 17.
The tube portion 111 is filled with a predetermined amount of mercury and a rare gas such as argon gas as a buffer gas for improving startability.

  Here, the sealing portion 112, the molybdenum foil 14, the back side external electrode 16, the back side internal lead 19 and the tungsten electrode 12 form a first electrode portion, and the sealing portion 113, the molybdenum foil 15, The distal end side external electrode 17, the distal end side internal lead 20, the tungsten electrode 13 and the distal end side lead wire 18 form a second electrode portion. Further, the distal end side external electrode 17 and the distal end side lead wire 18 correspond to the distal end of the second electrode portion.

  The reason why the molybdenum foils 14 and 15 are used as the material sealed in the sealing portions 112 and 113 is that the inside of the bulb portion 111 at the time of light emission has a high pressure (for example, 100 atm or more), and thus airtightness to the outside is required. This is because molybdenum has an oxide easily dissolved in quartz glass and has a larger coefficient of linear expansion than quartz glass, so that the molybdenum foil can be plastically deformed during lighting to maintain airtightness.

  For the arc tube 110, other discharge lamps such as a xenon lamp and a metal halide lamp may be used instead of the ultra-high pressure mercury lamp. The lighting drive method may be either a direct current method or an alternating current method.

FIG. 3 is a perspective view of the cooling air inlet member 1 provided in the cooling air inlet 141 as viewed from the cooling air inlet side. The cooling air inlet member 1 includes a tip side air guide fin 2 that is a first cooling air control member, a tube side air guide fin 3 that is a second cooling air control member, an air guide 4, It consists of the upper surface and bottom surface joined to the upper side and lower side in the Z direction of the front end side air guide fins 2 and the air guide 4.
The tip side air guide fins 2 and the tube part side air guide fins 3 are rectangular planes, and the air guide 4 is a trapezoidal plane with the cooling air inflow side as the long side and the cooling air outflow side as the short side. is there. One side of the tube portion side wind guide fin 3 is attached to one side of the tip portion side wind guide fin 2 at a predetermined angle θ with respect to an extension line of the tip portion side wind guide fin 2. The air guide 4 is substantially opposed to the front end side air guide fins 2, and the front end side air guide fins 2, the air guide 4, the upper surface and the bottom surface form a cooling air passage.

In FIG. 3, the tip side air guide fins 2 and the tube part side air guide fins 3 are rectangular planes, and the air guide 4 is a trapezoidal plane. These shapes are described in FIG. For example, the air guide 4 is also rectangular, the tip side air guide fins 2 are trapezoidal with the cooling air inflow side as the long side and the cooling air outflow side as the short side, like the air guide 4, The tube-portion-side air guide fins 3 may be square circles.
Further, the air guide 4 may be a part of the cooling air inlet member 1 as shown in FIG. 3, but may be integrated with the front glass holder 140, and the air guide 4 is used as a single component. It may be attached to the cooling air inlet 141.

  In FIG. 3, the cooling air flowing into the cooling air inlet member 1 in the direction of (−) to (+) in the Y direction is divided into left and right by the front end side air guide fins 2, The direction of the cooling air that has passed through the part-side air guide fin 2, the air guide 4, and the passage formed by the upper surface and the bottom surface and advanced to the right side is changed to the tube-side air guide fin 3. The flow of the cooling air will be described later with reference to FIG.

4 is a cross-sectional view taken along line AA when the light source device in FIG. 1 is viewed from above. In addition, in the figure, the same code | symbol is attached | subjected to the structure same as FIG. 1 thru | or FIG. 3, and the description is abbreviate | omitted.
In FIG. 4, a sealing portion 112 of the arc tube 110 is attached to the center of the bottom surface of the concave mirror 120, and a lead wire (not shown) is connected to the back side external electrode 16 (not shown) corresponding to the right end of the sealing portion 112. Is connected and power is supplied from the outside.

  The front glass holder 140 is formed with a cooling air inlet 141 having an opening area through which cooling air flowing into the internal space 121 can sufficiently pass, and the cooling air inlet member 1 illustrated in FIG. 1 is attached. A cooling duct 146 is attached to the outside of the concave reflecting mirror 120 at the inlet 141, and an intake fan (not shown) is connected to the tip of the cooling duct 146. This intake fan is a centrifugal fan or an axial fan such as a sirocco fan.

In the front glass holder 140, a cooling air outlet 142 through which the cooling air can pass is formed at a position facing the cooling air inlet 141 across the optical axis 180, and the cooling air is also passed to the neck of the concave reflector 120. A neck discharge port 122 serving as a discharge port is formed. In addition, an explosion-proof net 143 is attached to the cooling air inlet member 1 of the cooling air inlet 141, the cooling air outlet 142, and the neck outlet 122 for preventing fragment scattering when the arc tube 110 is ruptured.
The cooling air that has flowed into the internal space 121 from the cooling duct 146 through the cooling air inlet member 1 installed at the cooling air inlet 141 flows out of the concave reflector 120 from the cooling air outlet 142 or the neck outlet 122. To do. The flow of cooling air in the light source device is indicated by arrows.

The front-end side air guide fin 2 divides the cooling air inlet 141 into two in the X direction parallel to the optical axis 180, and an opening close to the front glass 130 and an opening close to the center of the bottom of the concave reflecting mirror 120 are formed. Is done. Of the divided openings, the opening close to the front glass 130 is referred to as a first cooling air inlet 144, and the opening close to the center of the bottom surface of the concave reflecting mirror 120 is referred to as a second cooling air inlet 145. That is, the cooling air flowing into the cooling air inlet member 1 from the cooling duct 146 flows into the cooling air W1 flowing from the first cooling air inlet 144 and the second cooling air inlet 145 by the front end side air guide fins 2. The cooling air is divided into cooling air W2 and flows into the internal space 121.
The cooling air W1 and W2 correspond to the first cooling air and the second cooling air.

  The cooling air W1 flowing into the internal space 121 from the first cooling air inlet 144 flows toward the front end side external electrode 17 and the front end side lead wire 18 by the front end side air guide fins 2. Further, the air guide fins 4 rectify the cooling air W1 together with the front end side air guide fins 2 positioned substantially opposite to direct the cooling air W1 toward the front end side external electrode 17 and the front end side lead wire 18.

Further, the tube portion side wind guide fins 3 are attached to the end portions near the internal space 121 of the tip portion side wind guide fins 2, and the concave reflecting mirror 120 extends in the extending direction of the tip portion side wind guide fins 2. A predetermined angle θ is formed toward the center of the bottom surface, that is, in the X (+) direction. Here, the opening surfaces of the first cooling air inlet 144 and the second cooling air inlet 145 connected to the inner wall surface of the concave reflecting mirror 120 in the cooling air inlet 141 are substantially parallel to the tube portion side wind guide fins 3. ing.
Furthermore, the end surface which is the end closest to the center of the bottom surface of the concave reflecting mirror 120 of the tube portion side wind guide fin 3 and is the side facing the side having the attachment portion to the tip portion side wind guide fin 2 as one side. 3a is closer to the center of the bottom surface of the concave reflecting mirror 120 in the X direction than the position closest to the center of the bottom surface of the concave reflecting mirror 120 of the second cooling air inlet 145. The cooling air inflow port 145 is installed so as to change the direction of the cooling air W2 flowing in.

Next, the flow of the cooling air in the internal space 121 will be further described with reference to FIG.
When the cooling air W1 flowing in from the first cooling air inlet 144 flows into the internal space 121 from the cooling duct 146, it is only rectified by the front end side air guiding fins 2 and the air guiding guide 4, so that the wind speed is maintained. The tip-side external electrode 17 and the tip-side lead wire 18 are collided as they are, and the tip-side external electrode 17 and the tip-side lead wire 18 are cooled. Thereafter, the cooling air W1 hits the inner wall surface of the concave reflecting mirror 120 with a certain wind speed and flows along the inner wall surface of the concave mirror reflecting mirror 120 as indicated by an arrow. At this time, the cooling air W <b> 1 hits the distal end side external electrode 17 and the distal end side lead wire 18 and the wind speed and direction are disturbed, so that the cooling air W <b> 1 whose air volume is not uniform is directed toward the tube portion 111.

On the other hand, the traveling direction of the cooling air W <b> 2 flowing into the internal space 121 from the second cooling air inlet 145 is the cooling air W <b> 1 directed toward the distal end side external electrode 17 and the distal end side lead wire 18 by the tube portion side wind guide fins 3. Is changed to a different direction, and rectified so as to be directed toward the center of the bottom surface of the concave reflecting mirror 120. The rectified cooling air W <b> 2 flows along the inner wall surface of the concave reflecting mirror 120 and travels toward the tube portion 111. As a result, the cooling air W2 collides with the cooling air W1 in the vicinity of the tube portion 111.
Due to this collision, the wind speed of the cooling air W1 toward the tube portion 111 and the wind speed of the cooling air W2 toward the tube portion 111 in the same manner as the cooling air W1 are weakened. It stays in the vicinity of the tube portion 111 of the reflecting mirror 120 and is eventually discharged from the cooling air outlet 142 or the neck outlet 122.

  In this way, the cooling air W2 flows in a direction that suppresses the flow of the cooling air W1 to the tube portion 111, so that the influence of the cooling air W1 on the temperature of the tube portion 111, particularly supercooling and partial A temperature drop or a temperature rise can be suppressed. Therefore, it is possible to cool the distal end side external electrode 17 and the distal end side lead wire 18 while keeping the temperature of the tube portion 111 properly, and to maintain the light use efficiency of the arc tube 110.

  Next, adjustment of the cooling air W1 flowing into the internal space 121 from the first cooling air inlet 144 and the cooling air W2 flowing into the internal space 121 from the second cooling air inlet 145 will be described.

First, the influence of the cooling air W1 from the tube portion side air guide fins 3 will be considered.
The cooling air W1 flows toward the distal-end-side external electrode 17 and the distal-end-side lead wire 18, but the cooling-air W1 is installed on the tube-portion-side wind guide that is attached to the tip-end-side air guide fins 2 at an angle. It may be affected by the fins 3. When the angle θ of the tube portion side air guide fin 3 with respect to the tip portion side air guide fin 2 is small, the cooling air W1 cannot be sufficiently separated from the wall surface of the tube portion side air guide fin 3 and the tube portion side air guide fin. Resistance is received from the wall surface of the fin 3, or separation from the cooling air W2 becomes insufficient and the air velocity of the cooling air W2 is affected. Then, the cooling air W1 loses the wind speed or moves in a direction deviated from the front end side external electrode 17 and the front end side lead wire 18, and the cooling of the front end side external electrode 17 and the front end side lead wire 18 occurs. . Moreover, the wind speed of the cooling air W1 toward the inner wall surface of the concave reflecting mirror 120 is also lost.
Further, the cooling air W2 that is not sufficiently separated from the cooling air W1 loses the wind speed toward the tube portion 111 along the inner wall surface of the concave reflecting mirror 120, or does not follow the inner wall surface of the concave reflecting mirror 120. The wind speed toward the tube portion 111 is lost by flowing toward the cooling air W1.
As described above, depending on the angle of the tube portion side air guide fin 3 with respect to the tip portion side air guide fin 2, the wind speeds of the cooling air W1 and W2 are affected. In some cases, it becomes difficult to control the temperature of the arc tube 110. Therefore, in order to sufficiently cool the distal end side external electrode 17 and the distal end lead wire 18 and to keep the temperature of the tube portion 111 properly, the distal end side of the tube portion side wind guide fins 3 is ensured. It is necessary to make the angle θ made with respect to the air guide fins 2 a certain value or more.

  FIG. 5 is a model diagram for obtaining an allowable range of the angle θ so that the cooling air W <b> 1 is not affected by the tube portion side air guide fins 3. Here, an enlarged outlet pipe having an outlet-side inner diameter larger than the wind inlet-side inner diameter is used, and the pipe portion formed by the outlet side wall surface G2 is connected to the distal end portion of the pipe formed by the inlet-side wall surface G1. It is attached so as to spread at a predetermined angle θ with respect to the extended line of the wall surface G1. Further, the wind corresponding to the cooling air W1 is flowed from (−) to (+) in the Y direction, the pipe diameter on the inlet side of the wind is D1, the pipe diameter on the outlet side is D2, and the wind speed at the center of the pipe on the inlet side is set. V1, and the wind speed at the center of the tube on the outlet side is V2. Note that the predetermined angle θ between the wall surface G1 at the distal end side air guide fin 2, the wall surface G2 at the tube portion side air guide fin 3, and the wall surface G1 and the wall surface G2 is the front end side air guide fin 2 in FIG. And the tube portion side wind guide fins 3 are considered to correspond to an angle θ.

  FIG. 6 is a graph in which the inlet / outlet pipe diameter ratio D2 / D1 in FIG. 5 is plotted on the horizontal axis and the inlet / outlet wind speed ratio V2 / V1 is plotted on the vertical axis, and the angle θ between the wall surface G1 and the wall surface G2 is The change of the wind speed ratio V2 / V1 with respect to ratio D2 / D1 of the pipe diameter of an inlet port in the case of 3.5 degrees, 6 degrees, 10 degrees, 15 degrees, and 30 degrees is shown. In FIG. 6, the wind speed ratio V2 / V1 approaches 1 as the angle θ increases, and V2 / V1 = 1 when the angle θ is 30 ° or more. That is, it can be seen that if the angle θ is 30 ° or more, the wind speed at the inlet and the outlet does not change.

Furthermore, the wind speed ratio V2 / V1 when the tube diameters D1 and D2 in FIG. 5 are fixed and the angle θ is changed is measured.
FIG. 7 shows the wind speed ratio V2 / V1 when the diameters of the inlet and the outlet in FIG. 5 are D1 = 5 mm and D2 = 9.4 mm, and the angle θ is changed with the angle θ as the horizontal axis. . Also in FIG. 7, the wind speed ratio V2 / V1 approaches 1 as the angle θ increases, and the wind speed ratio V2 / V1 = 1 when the angle θ is 30 ° or more.
Note that FIG. 7 is obtained by drawing an approximate straight line with respect to the measurement point. When the angle θ is 0 °, the state is the same as that of a single tube with no change in tube diameter, so V2 / V1 is It is considered that V2 / V1 = 1 instead of the value decreasing as indicated by 7.

  As shown in FIGS. 6 and 7, when the wall surface G2 is inclined with respect to the wall surface G1, that is, when the angle θ is greater than 0 °, the wind speed V2 on the outlet side is decelerated and the angle θ is increased. Accordingly, it can be seen that when the deceleration of the wind speed V2 is reduced and the angle θ is 30 ° or more, the wall surface G2 does not affect the flow of the wind and the wind speed is not lost at the exit side. That is, if the angle θ of the tube portion side wind guide fins 3 with respect to the tip portion side wind guide fins 2 is 30 ° or more, the cooling air W1 can be sufficiently separated from the tube portion side wind guide fins 3 without losing the wind speed. Thus, it is possible to reliably cool the distal end side external electrode 17 and the distal end side lead wire 18 and keep the temperature of the tube portion 111 properly. On the other hand, when the angle θ is smaller than 30 °, it is considered that the cooling air W1 cannot ignore the influence of the tube portion side air guide fins 3.

Further, the influence of the cooling air W2 from the tube portion side air guide fins 3 will be considered.
FIG. 8 is a schematic diagram for explaining the influence of the tube portion side air guide fins 3 on the cooling air W2. In FIG. 8, the wall surface G3 on the wind inlet side and the wall surface G4 on the outlet side are, for example, rectangular planes, and one side surface of the wall surface G4 forms a predetermined angle θ with respect to an extension line of the wall surface G3. It is attached to one side of G3. Here, the wall surface G3 is at the front end side air guide fin 2, the wall surface G4 is at the tube portion side air guide fin 3, and the predetermined angle θ between the wall surface G3 and the wall surface G4 is the front end portion side air guide fin in FIG. 2 and the angle θ formed by the tube portion side wind guide fins 3. Further, when a wind corresponding to the cooling air W2 flows from the wall surface G3 to the X (+) side, the wind speed at the center in the Z direction of the wall surface G3 on the inlet side is V3, and the wind speed in the Z direction of the wall surface G4 on the outlet side. The wind speed at the center is V4, and the complementary angle of the angle θ formed by the wall surface G3 and the wall surface G4 is the angle θ1.

  In FIG. 8, when the cooling air W2 flows in from the (−) to (+) direction in the Y direction at the wind speed V3, the angle θ1 is 30 so that the cooling air W2 is not affected by the wall surface G4 and does not stall. Must be greater than °. This is based on the fact that the angle θ for preventing the cooling air W1 obtained in FIGS. 5 to 7 from losing the wind speed is 30 ° or more. If the angle θ1 is 30 ° or more, the cooling air W2 flowing in at the speed V3 can be sufficiently separated from the wall surface G4 and is not mixed with the cooling air W1, so that the wind speed of the cooling air W1 is not weakened.

  Thus, since the complementary angle θ1 of the angle θ needs to be 30 ° or more, the angle θ needs to be 150 ° or less. That is, if the angle θ of the tube portion side wind guide fins 3 with respect to the tip portion side wind guide fins 2 is 30 ° or more and 150 ° or less, the cooling air W1 does not weaken the wind speed and does not change the wind direction. The external electrode 17 and the tip-side lead wire 18 can be cooled.

Next, the width of the tube portion side wind guide fins 3 will be described.
FIG. 9A is an enlarged sectional view of the vicinity of the cooling air inlet member 1 in FIG. In FIG. 9A, the opening surfaces of the first cooling air inlet 144 and the second cooling air inlet 145 connected to the inner wall surface of the concave reflecting mirror 120 in the cooling air inlet 141, the tube portion side wind guide fins 3, and the like. Are substantially parallel, and the end surface 3a closest to the center of the bottom surface of the concave reflecting mirror 120 of the tube side wind guide fin 3 is located at the center of the bottom surface of the concave reflecting mirror 120 of the second cooling air inlet 145. It is located closer to the center of the bottom surface of the concave reflecting mirror 120 than the closest extension line L1 in the Y direction. In this case, the cooling air W2 flowing in from the second cooling air inlet 145 is directed to the distal end-side external electrode 17 and the distal end lead wire 18 just like the cooling air W1 immediately after flowing into the second cooling wind inlet 145. The flow that has been changed can be changed by the tube side air guide fins 3 toward the bottom center of the concave reflecting mirror 120. Thereafter, the cooling air W2 travels along the inner wall surface of the concave reflecting mirror 120 toward the tube portion 111 (not shown).

FIG. 9 (b) shows another form of the cooling air inlet member 1. Compared to FIG. 9A, the width of the tube portion side wind guide fins 3 is long and the angle θ is small. Even if it does in this way, the advancing direction of the cooling air W2 can be changed, and it can go to the tube | bulb part 111 along the inner wall of the concave reflecting mirror 120. FIG.
That is, as shown in FIGS. 9A and 9B, the end surface 3a is an extension line L1 in the Y direction at a position closest to the center of the bottom surface of the concave reflecting mirror 120 of the second cooling air inlet 145. If it is located closer to the center of the bottom surface of the concave reflecting mirror 120, the wind direction can be changed so that the cooling air W2 travels along the inner wall surface of the concave reflecting mirror 120. It can be made to collide with the cooling air W1 which goes.

  In FIG. 4, in the cooling air inlet 141, when cooling air flows from the side closer to the front glass 130 toward the center of the bottom surface of the concave reflecting mirror 120, that is, from (−) to (+) in the X direction. However, the direction of the cooling air flowing into the cooling air inlet 141 may be changed.

  FIG. 10 shows the case where the air flowing into the cooling air inlet 141 in FIG. 4 flows from the center of the bottom surface of the concave reflecting mirror 120 toward the front glass 130, that is, from (+) to (−) in the X direction. 2 is a cross-sectional view of the optical device. In the figure, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted. This is because, as shown in FIG. 10, when the front end side external electrode 17 and the front end side lead wire 18 of the arc tube 110 are closer to the front glass 130 than the front end side external electrode 17 and the front end side lead wire 18 in FIG. This is an effective configuration for sufficiently blowing cooling air to the distal end side external electrode 17 and the distal end side lead wire 18.

In FIG. 10, the cooling air W1 flowing into the internal space 121 from the first cooling air inlet 144 flows toward the front end side external electrode 17 and the front end side lead wire 18 located near the front glass 130, and the front end side outside. After cooling the electrode 17 and the tip-side lead wire 18, the electrode 17 and the tip-side lead wire 18 are discharged to the outside of the concave reflecting mirror 120 from the cooling air outlet 142 in the traveling direction of the cooling air W 1, or the tip-side external electrode 17 and the tip-side lead wire 18. The traveling direction is changed by the front glass 130 or the like, and the air flows toward the tube portion 111 along the inner wall surface of the concave reflecting mirror 120.
On the other hand, the cooling air W2 flowing into the internal space 121 from the second cooling air inlet 145 changes the traveling direction from the direction toward the distal end side external electrode 17 and the distal end side lead wire 18 by the tube portion side wind guide fins 3. It is changed so as to face the center of the bottom surface of the concave reflecting mirror 120, and moves toward the tube portion 111 along the inner wall surface of the concave reflecting mirror 120.
Subsequent operations of the cooling air W1 and W2 are the same as the description of the cooling air W1 and W2 using FIG. 4 described above.

Also in this case, in order to sufficiently separate the cooling air W1 from the tube portion side air guide fins 3 and effectively cool the front end side external electrode 17 and the front end side lead wires 18, the front end portion side air guide fins 2 and It is desirable that the angle θ formed with the tube portion side wind guide fins 3 is 30 ° or more and 150 ° or less. Further, in order to cause the cooling air W2 to advance along the inner wall surface of the concave reflecting mirror 120 and to be directed to the tube portion 111, the end surface 3a is closest to the center of the bottom surface of the concave reflecting mirror 120 of the cooling air inlet 141. It suffices if the position is closer to the center of the bottom surface of the concave reflecting mirror 120 than the line L1 extending in the Y direction.
Of course, the wind direction of the cooling air inlet 141 may be oblique with respect to the optical axis 180 as shown in FIGS. 4 and 10, but may be perpendicular to the optical axis 180.

Further, in the above description, the cooling air inlet 141 is formed in a part of the front glass holder 140, and the tip air guide fins 2 and the tube part air guide fins 3 are provided in the cooling air inlet 141, so that the first The first cooling air inlet 144 and the second cooling air inlet 145 are formed, and the cooling air W1 and the cooling air W2 flow into the internal space 121. However, the cooling air W2 directed to the cooling air W1 flowing toward the tube portion 111 along the concave reflecting mirror 120 and the inflow port into which the cooling air directed to the distal-side external electrode 17 and the distal-side lead wire 18 flows. As long as it is an inflow inlet, the tip side air guide fins 2 and the tube part side air guide fins 3 do not have to be used. For example, a nozzle-like air outlet is connected to the first cooling air inlet and the second air inlet. It may be used as a cooling air inlet.
Furthermore, although the first cooling air inlet 144 and the second cooling air inlet 145 are arranged in parallel in the direction of the optical axis 180, the cooling air inlets may be arranged separately. For example, the first cooling air inlet 144 is formed in a part of the front glass holder 140 as in FIG. 4, and the second cooling air inlet 145 is formed at the position of the cooling air outlet 142 in FIG. .

  As described above, according to the first embodiment, the concave reflecting mirror 120 that has been conventionally used can be used without changing the orientation and arrangement order of optical components such as a rotary color filter and a light density uniformizing unit. Since the cooling wind inlet 141 is provided in the front glass holder 140, the light source device does not increase in size and the light utilization efficiency associated therewith does not decrease.

  Further, the cooling air W1 directed to the distal external electrode 17 and the distal lead wire 18 flows into the internal space 121, and the cooling air W1 directed to the cooling air W1 after hitting the distal external electrode 17 and the distal lead 18 is directed to the cooling air W1. Since the wind W2 flows into the internal space 121, the cooling wind W2 suppresses the flow of the cooling wind W1 toward the tube portion 111, and the cooling wind W1 affects the temperature of the tube portion 111, particularly overcooling and partial Temperature drop or temperature rise can be suppressed. Accordingly, it is possible to prevent the temperature increase by sufficiently cooling the distal end side external electrode 17 and the distal end side lead wire 18 while keeping the temperature of the tube portion 111 appropriately. That is, the luminous tube 110 is ideally cooled to increase luminous efficiency, and a light source device with high brightness and long life can be obtained.

  Further, by setting the attachment angle θ of the tube portion side wind guide fins 3 to 30 ° or more and 150 ° or less with respect to the tip portion side wind guide fins 2, it is directed to the tip side external electrodes 17 and the tip side lead wires 18. Since the cooling air W1 is sufficiently separated from the tube portion side air guide fins 3 and the speed is not lost, the front end side external electrode 17 and the front end side lead wire 18 can be effectively cooled.

  Further, the end surface 3a closest to the center of the bottom surface of the concave reflecting mirror 120 of the tube portion side wind guide fin 3 is more concavely reflected than the position closest to the center of the bottom surface of the concave reflecting mirror 120 of the second cooling air inlet 145. Since the cooling air W2 is positioned close to the central portion of the bottom surface of the mirror 120, the cooling air W2 is directed along the inner wall surface of the concave reflecting mirror 120 and directed toward the cooling air W1 toward the tube portion 111, and the tube portion 111 of the cooling air W1. It is possible to prevent the tube bulb portion 111 from being overcooled.

Embodiment 2. FIG.
In the first embodiment, in the cooling air inlet member 1, one side of the tube portion side wind guide fin 3 is attached to one side of the tip portion side wind guide fin 2, and as shown in FIG. The end surface 3a closest to the center of the bottom surface of the concave reflecting mirror 120 of the wind guide fin 3 is positioned at the center of the bottom surface of the concave reflecting mirror 120 at a position closest to the center of the bottom surface of the concave reflecting mirror 120 of the second cooling air inlet 145. It was positioned to be close to. As a result, the cooling air W <b> 2 that flows in from the second cooling air inlet 145 is directed toward the tube portion 111 along the inner wall surface of the concave reflecting mirror 120.
In the second embodiment, the position closest to the center of the bottom surface of the concave reflector 120 of the second cooling air inlet 145 is the center of the bottom surface of the concave reflector 120 of the tube side wind guide fin 3. It is positioned so as to be closer to the center of the bottom surface of the concave reflecting mirror 120 than to the near end surface 3a.

  FIG. 11 is a cross-sectional view of the XY plane when the light source device according to the second embodiment is viewed from above, and FIG. 12 shows the cooling air inlet member 1 according to the second embodiment as a flow of cooling air. It is the perspective view seen from the entrance side, and Fig.13 (a) is an expanded sectional view of the cooling air flow inlet member 1 vicinity in FIG. 11, FIG. 12 and FIG. 13 (a), the same components as those in FIG. 4, FIG. 3 and FIG. 9 (a) are denoted by the same reference numerals, and the description thereof is omitted.

In FIG. 13A, the end surface 3a closest to the center of the bottom surface of the concave reflecting mirror 120 of the tube side wind guide fin 3 is closest to the center of the bottom surface of the concave reflecting mirror 120 of the second cooling air inlet 145. It is located closer to the front glass 130 than the extension line L1 in the Y direction. In this case, the cooling air W2 flowing in from the second cooling air inlet 145 does not flow gently along the inner wall surface of the concave reflecting mirror 120 as in the first embodiment, but enters the internal space 121 as indicated by an arrow. While diffusing, blow toward the tube portion 111 (not shown).
Further, the end surface 3a closest to the center of the bottom surface of the concave reflecting mirror 120 of the tube side wind guide fin 3 is in the Y direction at the position closest to the center of the bottom surface of the concave reflecting mirror 120 of the second cooling air inlet 145. If it is located closer to the front glass 130 than the extended line L1, the width of the tube portion side wind guide fins 3 and the angle θ with the tip portion side wind guide fins 2 are as shown in FIG. It may be different from the width or angle θ of the tube portion side air guide fins 3. For example, as shown in FIG. 13B, the width of the tube portion side air guide fins 3 is shorter than that of FIG. 13A, the angle θ is increased, and the tube portion side air guide fins 3 are concavely reflected. For example, the mirror 120 is arranged substantially parallel to the inner wall surface of the mirror 120 near the second cooling air inlet 145.

  In FIG. 11, the cooling air W <b> 2 blown toward the tube portion 111 reaches the tube portion 111 while rapidly diffusing the flow, but a part of the cooling air W <b> 2 reaches before the tube portion 111. It collides with the cooling air W1 and suppresses the flow of the cooling air W1. For this reason, the cooling air W1 having a non-uniform air flow, which flows from the first cooling air inlet 144 and whose air speed is disturbed by the external electrode 17, the leading end lead wire 18, the sealing portion 113, etc., reaches the tube portion 111. Therefore, it is possible to prevent the tube portion 111 from being partially cooled directly, and the tube portion 111 can be uniformly cooled.

  Further, in the second embodiment, the cooling air W1 and the cooling air W2 flow along the inner wall surface of the concave reflecting mirror 120, so that the cooling air is directed toward the center of the bottom surface of the concave reflecting mirror 120. Compared with Embodiment 1, the cooling air toward the bottom center of the concave reflecting mirror 120 is reduced. That is, since the cooling air toward the root of the sealing portion 112 decreases, the temperature near the root of the sealing portion 112 becomes relatively high. As a result, the thermal gradient in the vicinity of the sealing portion 112 becomes gentle, and there is an effect of reducing the burst in the light source device in which the burst starting from the vicinity of the sealing portion 112 is likely to occur due to a rapid change in the thermal gradient.

  As described above, according to the second embodiment, since the cooling air W2 is blown toward the tube portion 111, the cooling air W2 directly acts on the cooling air W1 before reaching the tube portion 111. The cooling air W1 can be prevented from directly colliding with the tube portion 111 and being directly cooled, and the tube portion 111 can be uniformly cooled. Therefore, while maintaining the temperature of the tube portion 111 more appropriately, the distal end side external electrode 17 and the distal end side lead wire 18 are sufficiently cooled to prevent the temperature rise, and the luminous efficiency of the arc tube 110 is enhanced, and the luminance and long life are increased. A light source device can be obtained.

  In addition, since the cooling air that reaches the vicinity of the center of the bottom surface of the concave reflecting mirror 120 is reduced, the temperature gradient of the sealing portion 112 can be moderated to prevent the arc tube 110 from bursting.

Embodiment 3 FIG.
In the first embodiment and the second embodiment, the tube portion side wind guide fins 3 are planar members that change the direction of the cooling air W2 flowing into the internal space 121 from the second cooling air inlet 145. However, in the third embodiment, the tube portion side wind guide fins 3 are provided with the second openings through which the second cooling air passes.

  FIG. 14 is a cross-sectional view of the XY plane when the light source device according to the third embodiment is viewed from above, and FIG. 15 shows the cooling air inlet member 1 according to the third embodiment as a flow of cooling air. It is the perspective view seen from the entrance side. 14 and 15, the same components as those in FIGS. 11 and 12 are denoted by the same reference numerals, and the description thereof is omitted.

In FIG. 15, a slit S is provided as a second opening at a substantially central portion of the tube portion side air guide fins 3 constituting the cooling air inlet member 1, and in FIG. 14, the second cooling air inlet is provided. The cooling air W2 that has flowed into the internal space 121 from 145 is blown toward the tube portion 111 in the same manner as in the second embodiment, and from the slit S toward the sealing portion 113 that is a part of the second electrode portion. Also infuse. Thereby, in Embodiment 1 and Embodiment 2, it is possible to sufficiently cool the sealing portion 113 that tends to be insufficiently cooled without being supplied with cooling air. Further, the sealing portion 113 is cooled, so that the electrode 13 connected inside the sealing portion 113 and the tube portion 111 is also cooled.
When the electrode 13 is cooled, the amount of mercury attached to the electrode 13 increases when the light source is turned off, and the mercury attached to the inner wall of the tube portion 111 decreases. Then, when the light source is turned on, the occurrence of abnormal discharge from the electrode 13 to the mercury attached to the inner wall of the bulb portion 111 is reduced, and the blackening of the inner wall of the bulb portion 111 is less likely to occur. Decline can be prevented.

  14 and 15, the end surface 3a closest to the center of the bottom surface of the concave reflecting mirror 120 of the tube portion side wind guide fin 3 is placed at the center of the bottom surface of the concave reflecting mirror 120 of the second cooling air inlet 145. The cooling air W <b> 2 is blown into the tube portion 111 so as to be closer to the front glass 130 than the closest position. However, as in the first embodiment, the end surface 3a closest to the center of the bottom surface of the concave reflecting mirror 120 of the tube portion side wind guide fin 3 is the center of the bottom surface of the concave reflecting mirror 120 of the second cooling air inlet 145. The cooling air W <b> 2 may be caused to flow along the inner wall surface of the concave reflecting mirror 120 to the tube portion 111 by being positioned closer to the center of the bottom surface of the concave reflecting mirror 120 than the position closest to.

  As described above, according to the third embodiment, since the slit S is provided in the substantially central portion of the tube portion side air guide fin 3, the sealing portion 113 and the distal end side electrode 13 of the arc tube 110 are sufficiently cooled. As a result, blackening of the inner wall of the bulb portion 111 is less likely to occur, and the light emitting device with high luminance and long life can be obtained while maintaining the luminous efficiency of the arc tube 110.

Embodiment 4 FIG.
In Embodiment 3, the tube portion side air guide fin 3 is provided with the slit S as the second opening. However, in Embodiment 4, the rectangular cutout is formed on the tube portion side air guide fin. 3 is provided at the top or bottom.

  FIG. 16 is a cross-sectional view of the XY plane when the light source device according to the fourth embodiment is viewed from above. FIG. 17 shows the cooling air inlet member 1 according to the fourth embodiment as a flow of cooling air. It is the perspective view seen from the entrance side. 16 and 17, the same components as those in FIGS. 14 and 15 are denoted by the same reference numerals, and the description thereof is omitted.

17, a rectangular cutout is provided in the lower part in the Z direction of the tube portion side air guide fins 3. In FIG. 16, the cooling air flowing into the internal space 121 from the second cooling air inlet 145 is provided. W2 flows in a large amount from the rectangular cutout portion. In other words, the cooling air W2 can be introduced from the rectangular cutout portion and directed to the location requiring cooling. Accordingly, in FIG. 16, when the cooling air blown into the internal space 121 from the cooling air inlet 1 is uneven in the air volume in the vertical direction in the Z direction, the tube-side air guide fins 3 have a small air volume. If the cutout portion is provided, the cooling air W2 flows into the internal space 121 from the cutout portion, and cools the distal end portion of the arc tube 110 such as the distal end side external electrode 17 and the distal end side lead wire 18. It is possible to cool a place where cooling by is insufficient. Further, when the arc tube 110 is displaced from the center of the concave reflecting mirror 120, for example, when the arc tube 110 is displaced either up or down in the Z direction, the direction in which the arc tube 110 is displaced in the tube portion side wind guide fins 3 If the notch portion is provided in a portion close to, the cooling air W1 flowing in from the notch portion can compensate for the insufficient cooling of the arc tube 110 that occurs because the direction of the cooling air W1 deviates from the direction toward the arc tube 110. it can.
In other words, the cooling non-uniformity caused by the deviation of the air flow in the vertical direction in the Z direction of the cooling air W1 and W2 is corrected, and each part of the arc tube 110 such as the bulb portion 111, the external electrode 17 and the tip side lead wire 18 is made uniform. Can be cooled to.

  In addition, although the example which notched a part of lower part in the tube part side wind guide fin 3 is shown in FIG. 17, you may notch the upper part. Further, in addition to dividing the tube portion side air guide fin 3 into two parts, an upper part and a lower part, a part thereof may be cut out by dividing into three parts or four parts.

  As described above, according to the fourth embodiment, a portion of the tube portion side air guide fin 3 is cut away, so that the bias when the cooling air flows in is corrected, and each portion of the arc tube 110 is fixed. It can cool uniformly. Thereby, the luminous efficiency of the arc tube 110 can be increased, and a light source device with high brightness and long life can be obtained.

Embodiment 5 FIG.
FIG. 18 is a top view of a single-plate field sequential projector 200 in which the light source device shown in the first to fourth embodiments is installed. In FIG. 18, the concave reflecting mirror 120 constituting the light source device is housed in a housing 201. An exhaust port 203 having an exhaust fan 202 is connected to the housing 201, and a cooling duct 146 connected to the light source device is connected to the housing 201. Is connected to an intake fan 204 that sends cooling air into the internal space 121.
Further, an ultraviolet unit 150, a rotary color filter 160, a light density uniformizing unit 170, and an optical unit 205 including an element that transmits or reflects light are disposed on the front surface of the front glass 130.

  The light emitted from the front glass 130 passes through the ultraviolet filter 150, the rotary color filter 160, the light density uniformizing means 170, and the optical unit 205, and is projected on the screen 206 provided on the opposite side of the optical unit 205. The In addition, the dotted line arrow in a figure has shown the projection direction of light.

On the other hand, the cooling air taken into the internal space 121 by the intake fan 204 is discharged into the housing 201 outside the concave reflecting mirror 120 from the cooling air discharge port 142 or the neck discharge port 122, and is further exhausted by the exhaust fan 202. It is discharged from 203 to the outside of the projector 200. The method of flowing the cooling air in the internal space 121 has been described in each of the above embodiments, and will not be described.
Note that the intake fan 204 that sends cooling air into the internal space 121 may take air inside the projector 200 as cooling air, or may connect the intake fan 204 to the outside of the projector 200 and take air outside the projector 200 as cooling air. good. Further, a cooling device may be provided in the intake fan 204 to take in cooling air generated by the cooling device.

  As described above, according to the fifth embodiment, since the light source device according to the present invention is built in the single-plate field sequential projector 200, the temperature of each part of the arc tube 110 is ideally maintained and the luminous efficiency is improved. It is possible to realize a projector with high brightness and long life.

It is a side view of the light source device which concerns on Embodiment 1 of this invention. It is sectional drawing of the arc tube which concerns on Embodiment 1 of this invention. It is a perspective view of the cooling air inflow member concerning Embodiment 1 of this invention. It is sectional drawing of the light source device which concerns on Embodiment 1 of this invention. In Embodiment 1 of this invention, it is a model figure for calculating | requiring the tolerance | permissible_range of angle (theta). In Embodiment 1 of this invention, it is a graph for calculating | requiring the tolerance | permissible_range of angle (theta). In Embodiment 1 of this invention, it is a graph for calculating | requiring the tolerance | permissible_range of angle (theta). In Embodiment 1 of this invention, it is a schematic diagram for calculating | requiring the tolerance | permissible_range of angle (theta). It is an expanded sectional view of the light source device in Embodiment 1 of this invention. It is sectional drawing of the light source device which concerns on Embodiment 1 of this invention. It is sectional drawing of the light source device which concerns on Embodiment 2 of this invention. It is a perspective view of the cooling air inflow member which concerns on Embodiment 2 of this invention. It is an expanded sectional view of the light source device in Embodiment 2 of this invention. It is sectional drawing of the light source device which concerns on Embodiment 3 of this invention. It is a perspective view of the cooling air inflow member which concerns on Embodiment 3 of this invention. It is sectional drawing of the light source device which concerns on Embodiment 4 of this invention. It is a perspective view of the cooling air inflow member which concerns on Embodiment 4 of this invention. It is sectional drawing of the projector which concerns on Embodiment 5 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 17 External electrode, 18 Tip side lead wire, 110 Light emitting tube, 111 Tube part, 120 Concave reflector, 121 Internal space of concave reflector, 130 Transparent material, 144 1st cooling air inlet, 145 2nd cooling air flow entrance

Claims (10)

A concave surface portion having a space where one surface is open with a curved region that reflects light,
A transparent material covering the opening of the concave surface,
An arc tube comprising a pair of first electrode portion and second electrode portion disposed to face the tube portion, wherein the first electrode portion is disposed at the center of the bottom surface of the concave surface portion,
A first cooling air inflow port for flowing in a first cooling air directed to a tip of the second electrode portion located in the space;
A second cooling air inlet into which the second cooling air flows, which collides with the first cooling air toward the tube portion after reaching the tip of the second electrode portion ;
A first opening formed in the concave portion so as to allow cooling air to flow into the space of the concave portion,
Of the first opening, the first opening has a portion close to the transparent material as a first cooling air inlet and a portion near the center of the bottom surface of the concave portion as a second cooling air inlet. The first cooling air flowing into the first cooling air inlet is directed to the tip of the second electrode portion, and the first cooling air flowing into the first cooling air inlet is divided into a portion close to and far from the transparent material in the optical axis direction of the concave surface portion. A first cooling air control member for causing
The first cooling air control member is attached to an end portion of the first cooling air control member close to the space so as to incline at a predetermined angle from the extending direction toward the bottom surface central portion of the concave surface portion. A second cooling air control member that changes a traveling direction of the second cooling air that has entered the space from the second cooling air inlet so as to collide with the first cooling air;
A light source device comprising: The light source device according to claim 1 , wherein an angle of inclination of the second cooling air control member is 30 ° or more. The light source device according to claim 2 , wherein an angle of inclination of the second cooling air control member is 150 ° or less. The end closest to the center of the bottom surface of the concave surface portion of the second cooling air control member is located closer to the center of the bottom surface of the concave surface portion than the position closest to the center of the bottom surface of the concave surface portion of the first opening. the light source device according to any one of claims 1 to 3, characterized in that close. The end closest to the center of the bottom surface of the concave surface portion of the second cooling air control member is closer to the transparent material than the position closest to the center of the bottom surface of the concave surface portion of the first opening. the light source device according to any one of claims 1 to 3. The second cooling air control member, according to claim 1 to claim 3, characterized in that it comprises a second opening for directing the second electrode portion is passed through a portion of the second cooling air The light source device according to any one of the above. The second opening is a slit in a direction from an attachment position of the second cooling air control member to the first cooling air control member toward an end closest to the center of the bottom surface of the concave portion. Item 7. The light source device according to Item 6 . The second opening is rectangular, one side is parallel to the attachment location of the second cooling air control member to the first cooling air control member, and the other side extends from the attachment location to the center of the bottom surface of the concave portion. The light source device according to claim 6 , wherein the light source device is in a direction toward the nearest end. Closest side to the transparent material of the first opening, a light source device according to any one of claims 1 to 8, characterized in that a planar air guide. The light source device according to any one of claims 1 to 9, container, an optical unit for guiding the light emitted from the light source device to a screen provided outside of the housing for housing the light source device A projector comprising an intake fan for introducing cooling air into the light source device.

Images