JP2018120046A - Projector and method of controlling projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector with which it is possible to suppress the occurrence of a mercury bridge.SOLUTION: A projector of the present invention comprises: a discharge lamp for emitting light and having a pair of electrodes 92, 93; a cooling unit for sending air to the discharge lamp and cooling the discharge lamp; an optical modulator for modulating the light from the discharge lamp in accordance with image information; and a projection optical system for projecting the light modulated by the optical modulator. The discharge lamp has a light-emitting part that includes a discharge space 91 therein, the pair of electrodes 92, 93 are arranged inside the discharge space 91 facing each other in a first direction, and the control unit exercises control so that when the discharge lamp is steadily turned on, the air blow direction of the cooling unit is made a first air blow direction for sending air toward a prescribed portion of the light-emitting unit, and when the discharge lamp is turned off, the air blow direction of the cooling unit is made a second air blow direction for sending air toward one of edges in the first direction of the light-emitting unit that is different from the prescribed portion.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a projector and a projector control method.

When the discharge lamp is extinguished, the temperature in the discharge lamp decreases, so that mercury enclosed in the discharge lamp may condense and adhere to the inner wall or electrode of the discharge lamp. At this time, a mercury bridge in which the electrodes are connected by mercury may occur. When the mercury bridge occurs, the electrodes are short-circuited, so that the discharge lamp cannot be lit.

On the other hand, for example, in Patent Document 1, for the purpose of preventing mercury bridge, the lamp power supplied to the electrode is reduced to such an extent that the arc discharge is not extinguished in the transient state where the discharge lamp is switched from the lighting state to the extinguishing state. A method of cooling the arc tube portion to such an extent that mercury condenses is described.

Japanese Patent No. 4070420

However, in the above method, the position where mercury condenses in the arc tube portion (light emitting portion) is irregular, and mercury may adhere to the electrode tip. Further, the condensed mercury may move in the arc tube portion and adhere to the tip of the electrode. Therefore, there is a problem that the generation of mercury bridge cannot be sufficiently suppressed.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a projector capable of suppressing the occurrence of a mercury bridge and a control method for such a projector.

One aspect of the projector of the present invention includes a discharge lamp having a pair of electrodes and emitting light,
A cooling unit that blows air to the discharge lamp to cool the discharge lamp, a control unit that controls the cooling unit, a light modulation device that modulates light from the discharge lamp according to image information, and the light A projection optical system that projects light modulated by the modulation device, and the discharge lamp includes a light emitting unit including a discharge space therein, and the pair of electrodes face each other in a first direction. When the discharge lamp is in a steady lighting state, the control unit is disposed in the discharge space, and the cooling unit has a blowing direction as a first blowing direction for blowing air toward a predetermined portion of the light-emitting unit, and the discharge unit. When the electric light is extinguished, the air blowing direction of the cooling unit is set as the second air blowing direction for blowing air toward one of the end portions in the first direction of the light emitting unit different from the predetermined part. It is characterized by that.

According to one aspect of the projector of the present invention, the control unit blows the air blowing direction of the cooling unit when the discharge lamp is turned off toward one of the end portions in the first direction of the light emitting unit. The second blowing direction is used. Therefore, the temperature of any one of the end portions in the first direction of the light emitting portion tends to be lower than the condensation temperature of mercury earlier than the other portions of the light emitting portion. Thereby, the position where mercury condenses concentrates on one end side in the first direction in the discharge space.
Therefore, it is difficult for mercury to condense at the position connecting the pair of electrodes, and the occurrence of a mercury bridge can be suppressed.

In addition, by cooling one of the ends, the core rod of the electrode connected to the one end portion is also cooled, so that the temperature of the core rod is likely to be equal to or lower than the condensation temperature of mercury. Also adhere. Therefore, it can suppress moving in the discharge space after mercury is condensed. Therefore, the occurrence of mercury bridge can be further suppressed.

The cooling unit includes a blower and a wind direction changing unit that changes a blowing direction of the blower, and the control unit blows the blower by the wind direction changing unit when the discharge lamp is turned off. The direction may be changed from the first blowing direction to the second blowing direction.
According to this configuration, the blowing direction can be switched between the first blowing direction and the second blowing direction with one blowing device. Therefore, the number of parts constituting the cooling unit can be reduced.

The cooling unit includes a first blowing device whose blowing direction is the first blowing direction and a second blowing device whose blowing direction is the second blowing direction, and the control unit includes the discharge lamp When in a steady lighting state, when the discharge lamp is cooled by the first blower, and the discharge lamp is turned off,
The discharge lamp may be cooled by the second blower.
According to this configuration, there is no need to provide a wind direction changing unit that changes the blowing direction, and the cooling unit can be configured using only an existing blowing device, for example. Thereby, the structure of a cooling part can be simplified.

When the discharge lamp is extinguished, the control unit stops air blowing by the first blower,
It is good also as a structure which starts ventilation by the said 2nd air blower.
According to this configuration, any one of the end portions in the first direction of the light emitting unit can be suitably cooled by the second blower, and the occurrence of a mercury bridge can be further suppressed. Further, the power consumption of the projector can be reduced as compared with the case where the first blower is not stopped.

It further includes a reflecting mirror that reflects light emitted from the discharge lamp in a predetermined direction, and the reflecting mirror is fixed to one end of the first direction of the discharge lamp, and the second blowing direction is It is good also as a structure which is a direction which blows toward the edge part of the other side of the said 1st direction in the said light emission part.

For example, the reflecting mirror may have a large heat capacity and the temperature is difficult to decrease. In this case, the temperature of the end portion on one side in the first direction in the light emitting unit is maintained to some extent by the reflecting mirror. For this reason, the temperature at one end of the light emitting unit in the first direction may be less likely to be lower than the temperature at the other end of the light emitting unit in the first direction. In other words, the temperature of the other end portion in the first direction of the light emitting unit may be more likely to be lower than the temperature of the one end portion of the light emitting unit in the first direction.

Therefore, according to this configuration, when the discharge lamp is extinguished, air is blown toward the other end portion in the first direction in the light emitting portion where the temperature is likely to decrease. It is easy to suitably reduce the temperature of the end. Thereby, the temperature of the light emitting part is partially reduced, and mercury is more easily collected and condensed at a specific part. Therefore, it can suppress more that a mercury bridge arises.

It further includes a reflecting mirror that reflects light emitted from the discharge lamp in a predetermined direction, and the reflecting mirror is fixed to one end of the first direction of the discharge lamp, and the second blowing direction is It is good also as a structure which is a direction which blows toward the edge part of the said one side of the said 1st direction in the said light emission part.
According to this configuration, for example, by using a device for cooling the reflecting mirror together, it is possible to suitably reduce the temperature of the one end portion in the first direction in the light emitting unit.

It is good also as a structure further provided with the reflective mirror cooling part which cools the said reflective mirror when the said discharge lamp goes out.
According to this configuration, the cooling of the reflecting mirror by the reflecting mirror cooling unit can indirectly assist the cooling of the one end portion in the first direction in the light emitting unit by the cooling unit. for that reason,
When the cooling unit cools the end portion on the one side in the first direction in the light emitting unit, it is possible to further suppress the occurrence of a mercury bridge.

The predetermined portion may be configured to be an end portion on the upper side in the vertical direction of the light emitting portion.
Since the vertical upper end of the light emitting part is the hottest part in the light emitting part, according to this configuration,
When the discharge lamp is in a steady lighting state, the discharge lamp can be efficiently cooled.

One aspect of the projector control method of the present invention includes a discharge lamp having a pair of electrodes and emitting light, and a cooling unit that blows air to the discharge lamp and cools the discharge lamp. The discharge lamp has a light emitting part including a discharge space therein, and the pair of electrodes are disposed in the discharge space so as to face each other in a first direction. When in a steady lighting state, the air blowing direction of the cooling unit is a first air blowing direction for blowing air toward a predetermined part of the light emitting unit, and when the discharge lamp is turned off, the air blowing direction of the cooling unit is the predetermined air blowing direction. It is set as the 2nd ventilation direction which blows toward any one edge part among the edge parts in the said 1st direction of the said light emission part different from a site | part.

According to one aspect of the projector control method of the present invention, as described above,
The occurrence of mercury bridge can be suppressed.

It is a schematic block diagram of the projector of 1st Embodiment. It is a figure which shows the light source device of 1st Embodiment. It is a partial expanded sectional view of the discharge lamp of 1st Embodiment. It is a circuit diagram of the discharge lamp lighting device and control part of a 1st embodiment. It is a block diagram which shows the example of 1 structure of the control part of 1st Embodiment. It is a block diagram which shows the various components of the projector of 1st Embodiment. It is a figure which shows the state which the ventilation direction of the air blower changed with the wind direction change part in 1st Embodiment. It is a figure which shows the state which the ventilation direction of the air blower changed with the wind direction change part in 1st Embodiment. It is a figure which shows the state after light extinction of the discharge lamp at the time of making the ventilation direction of the cooling unit in 1st Embodiment into the ventilation direction at the time of light extinction. It is a figure which shows the light source device which is another example of 1st Embodiment. It is a figure which shows the light source device of 2nd Embodiment. It is a figure which shows the light source device of 3rd Embodiment. It is a figure which shows the state after extinction of the discharge lamp in a comparative example.

Hereinafter, a projector according to an embodiment of the invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiment, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, the actual structure may be different from the scale, number, or the like in each structure.

In the drawings as appropriate, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. XYZ
In the coordinate system, the Z-axis direction is the vertical direction. The Y-axis direction and the X-axis direction are horizontal directions orthogonal to the Z-axis direction, and are directions orthogonal to each other. In the following description, a direction parallel to the Z-axis direction may be referred to as “vertical direction Z”, and a direction parallel to the X-axis direction is referred to as “front-rear direction X
May be called. In the following description, the positive side (+ Z side) in the Z-axis direction is defined as the upper side in the vertical direction, and the negative side (−Z side) in the Z-axis direction is defined as the lower side in the vertical direction. X axis positive side (
+ X side) is the front side, and the negative side (−X side) in the X-axis direction is the rear side. The front-rear direction, the front side, and the rear side are simply names for explaining the relative positional relationship between the parts, and the actual layout relationship is a layout relationship other than the layout relationship indicated by these names. Also good.

<First Embodiment>
FIG. 1 is a schematic configuration diagram of a projector 500 according to the present embodiment. As shown in FIG.
The projector 500 of this embodiment includes a light source device 200, a collimating lens 305, an illumination optical system 310, a color separation optical system 320, and three liquid crystal light valves (light modulation devices) 330.
R, 330G, 330B, cross dichroic prism 340, and projection optical system 360
And an input unit 45.

The light emitted from the light source device 200 passes through the collimating lens 305 and the illumination optical system 310.
Is incident on. The collimating lens 305 collimates the light from the light source device 200.

The illumination optical system 310 converts the illuminance of light emitted from the light source device 200 to the liquid crystal light valve 3.
It adjusts so that it may become uniform on 30R, 330G, 330B. Furthermore, the illumination optical system 310 aligns the polarization direction of the light emitted from the light source device 200 in one direction. The reason is,
This is because the light emitted from the light source device 200 is effectively used by the liquid crystal light valves 330R, 330G, and 330B.

The light whose illuminance distribution and polarization direction are adjusted enters the color separation optical system 320. The color separation optical system 320 separates incident light into three color lights of red light (R), green light (G), and blue light (B). The three color lights are liquid crystal light valves 330R, 330G, and 33 associated with the respective color lights.
By 0B, each is modulated according to the video signal (image information). That is, the liquid crystal light valves 330R, 330G, and 330B modulate light emitted from the discharge lamp 90 according to image information. The liquid crystal light valves 330R, 330G, and 330B are liquid crystal panels 5 described later.
60R, 560G, 560B and a polarizing plate (not shown). The polarizing plates are disposed on the light incident side and the light emitting side of the liquid crystal panels 560R, 560G, and 560B, respectively.

The three modulated color lights are combined by the cross dichroic prism 340. The combined light enters the projection optical system 360. The projection optical system 360 transmits incident light to the screen 700 (
(See FIG. 6). That is, the projection optical system 360 includes the liquid crystal light valves 330R, 3
The light modulated by 30G and 330B is projected. As a result, an image is displayed on the screen 700. The collimating lens 305, the illumination optical system 310, the color separation optical system 320,
As each structure of the cross dichroic prism 340 and the projection optical system 360, a well-known structure is employable.

The light source device 200 includes a light source unit 210, a discharge lamp lighting device 10, a control unit 40, and a cooling unit 50.
FIG. 2 is a diagram illustrating the light source device 200. FIG. 2 shows a cross-sectional view of the light source unit 210. In FIG. 2, illustration of the control unit 40 is omitted. FIG. 2 shows a state where the discharge lamp 90 is steadily lit. In the present embodiment, the steady lighting of the discharge lamp 90 indicates a state where the preset driving power is supplied to the discharge lamp 90 and the discharge lamp 90 is lit.

As illustrated in FIG. 2, the light source unit 210 includes a discharge lamp 90 and a reflecting mirror 112. The discharge lamp 90 emits light. The discharge lamp lighting device 10 supplies the drive current I to the discharge lamp 90 to light the discharge lamp 90. The reflecting mirror 112 reflects the light emitted from the discharge lamp 90 in the irradiation direction (predetermined direction) D. The irradiation direction D is parallel to the optical axis AX of the discharge lamp 90. Also,
The irradiation direction D is a direction parallel to the front-rear direction X and is a direction from the rear side (−X side) to the front side (+ X side).

The discharge lamp 90 includes a discharge lamp main body 90a, and a first electrode 92 and a second electrode 93 as a pair of electrodes. The shape of the discharge lamp main body 90a is a rod shape extending along the front-rear direction X.
One end of the discharge lamp main body 90a, that is, one end of the discharge lamp 90 is a first end 90e1.
And The other end of the discharge lamp main body 90a, that is, the other end of the discharge lamp 90 is defined as a second end 90e2. The first end portion 90e1 is a rear side (one side,
−X side), and the second end 90e2 is an end of the discharge lamp 90 in the front-rear direction X (the other side, + X side). The material of the discharge lamp main body 90a is a translucent material such as quartz glass, for example.

The discharge lamp main body 90a includes a light emitting portion 510 including a discharge space 91 therein, and sealing portions 551 and 552 provided at both ends in the front-rear direction X of the light emitting portion 510. The light emitting portion 510 is a central portion in the front-rear direction X of the discharge lamp main body 90a and swells in a spherical shape. Inside the light emitting unit 510 is a discharge space 91. The discharge space 91 is filled with a gas that is a discharge medium containing mercury Hg, a rare gas, a metal halogen compound, and the like. The sealing portions 551 and 552 have a rod shape extending in the front-rear direction X from the light emitting portion 510. The sealing portions 551 and 552 seal the discharge space 91. The sealing portion 551 has a first end portion 90e1. The sealing portion 552 has a second end portion 90e2.

In the discharge space 91, the tips of the first electrode 92 and the second electrode 93 protrude. The first electrode 92 and the second electrode 93 as a pair of electrodes are disposed in the discharge space 91 so as to face each other in the front-rear direction X. That is, in the present embodiment, the front-rear direction X corresponds to the first direction. The first electrode 92 is disposed on the first end portion 90 e 1 side (rear side, −X side) of the discharge space 91. The second electrode 93 is disposed on the second end 90e2 side (front side, + X side) of the discharge space 91. The shape of the first electrode 92 and the second electrode 93 is a rod shape extending along the optical axis AX. In the discharge space 91, the electrode tip portions of the first electrode 92 and the second electrode 93 are arranged to face each other with a predetermined distance. The material of the first electrode 92 and the second electrode 93 is, for example, a metal such as tungsten. The proximal end portion of the first electrode 92 is held by the sealing portion 551. The base end portion of the second electrode 93 is held by the sealing portion 552.

FIG. 3 is an enlarged cross-sectional view showing a portion of the discharge lamp 90.
As shown in FIG. 3, the light emitting portion 510 is a first wall portion 510 a that is an inner wall surrounding the discharge space 91.
-It has the 4th wall part 510d. The first wall portion 510a and the second wall portion 510b are provided in the discharge space 9
1, the first electrode 92 and the second electrode 93 are wall portions positioned on both end sides in a direction (vertical direction Z in FIG. 3) orthogonal to the front-rear direction X. In FIG. 3, the first wall 51
0a is a wall portion located on the upper end side of the discharge space 91, and the second wall portion 510b is the discharge space 9.
It is a wall part located in the lower end side of 1. In the present embodiment, the first wall portion 510a is the light emitting portion 51.
The second wall portion 510 b corresponds to an end portion on the lower side in the vertical direction of the light emitting portion 510.

The third wall portion 510c and the fourth wall portion 510d are wall portions disposed on both ends in the front-rear direction X in which the first electrode 92 and the second electrode 93 are arranged facing each other with respect to the discharge space 91. In FIG. 3, the third wall portion 510 c is a wall portion located on the first electrode 92 side (rear side, −X side) of the discharge space 91, and the fourth wall portion 510 d is the second electrode of the discharge space 91. It is a wall part located in 93 side (front side, + X side). The third wall portion 510c and the fourth wall portion 510d are end portions in the front-rear direction X of the light emitting portion 510.

The third wall portion 510c includes, for example, a portion of the light emitting portion 510 included in the region S1. Region S
1, the position in the direction in which the first electrode 92 and the second electrode 93 are arranged to face each other (in the present embodiment, the front-rear direction X) is the position in the front-rear direction of the connecting portion between the main body portion 531 and the coil portion 532 described later. To the position in the front-rear direction of the connecting portion between the light emitting portion 510 and the sealing portion 551.

For example, the fourth wall portion 510d includes a portion of the light emitting portion 510 included in the region S2. Region S
2, the position in the direction in which the first electrode 92 and the second electrode 93 are arranged opposite to each other (in the present embodiment, the front-rear direction X) is the position in the front-rear direction of the connecting portion between the coil portion 542 and the main body portion 541 described later. To the front-rear direction position of the connecting portion between the light emitting portion 510 and the sealing portion 552.

The first electrode 92 includes a core rod 533, a coil portion 532, a main body portion 531 and a protrusion 531p. The first electrode 92 is a core rod 533 at a stage before being enclosed in the discharge lamp main body 90a.
A coil member 532 is formed by winding a wire of an electrode material (tungsten or the like) around the coil member 532, and the formed coil member 532 is heated and melted. Thus, a main body portion 531 having a large heat capacity and a projection 531p serving as a generation position of the arc AR are formed on the distal end side of the first electrode 92.

The second electrode 93 includes a core rod 543, a coil portion 542, a main body portion 541, and a protrusion 541p. The second electrode 93 is formed in the same manner as the first electrode 92.
In addition, since the 1st electrode 92 and the 2nd electrode 93 are the same structures, in the following description, only the 1st electrode 92 may be demonstrated as a representative. Further, since the protrusion 531p at the tip of the first electrode 92 and the protrusion 541p at the tip of the second electrode 93 have the same configuration, only the protrusion 531p may be described as a representative in the following description.

As shown in FIG. 2, a first terminal 536 is provided at the first end 90 e 1 of the discharge lamp 90. The first terminal 536 and the first electrode 92 include a conductive member 53 that penetrates the inside of the discharge lamp 90.
4 is electrically connected. Similarly, a second terminal 546 is provided at the second end 90 e 2 of the discharge lamp 90. The second terminal 546 and the second electrode 93 are electrically connected by a conductive member 544 that penetrates the inside of the discharge lamp 90. The material of the first terminal 536 and the second terminal 546 is, for example, a metal such as tungsten. As a material of the conductive members 534 and 544, for example, a molybdenum foil is used.

The first terminal 536 and the second terminal 546 are connected to the discharge lamp lighting device 10. The discharge lamp lighting device 10 supplies driving power for driving the discharge lamp 90 to the first terminal 536 and the second terminal 546. As a result, arc discharge occurs between the first electrode 92 and the second electrode 93. Light (discharge light) generated by the arc discharge is radiated in all directions from the discharge position, as indicated by the dashed arrows.

As shown in FIG. 3, when the discharge lamp 90 is turned on, the gas sealed in the discharge space 91 is heated by the generation of the arc AR and convects in the discharge space 91. Specifically, Arc A
Since R and the region in the vicinity thereof are extremely hot, the arc AR is formed in the discharge space 91.
A convection AF (indicated by a one-dot chain line arrow in FIG. 3) that flows upward in the vertical direction is formed. The convection AF hits the first wall portion 510a of the light emitting portion 510, and the first wall portion 510a of the light emitting portion 510.
To move along the third wall portion 510c and the fourth wall portion 510d from the first electrode 92 and the second wall portion 510d.
By passing through the core rods 533 and 543 of the electrode 93, the electrode 93 descends while being cooled.

The descending convection AF further descends along the third wall portion 510c and the fourth wall portion 510d of the light emitting portion 510, but collides with each other on the lower side in the vertical direction of the arc AR so as to be returned to the upper arc AR. To rise. The convection AF moves along the inner wall (first wall portion 510a to fourth wall portion 510d) of the light emitting portion 510, whereby the light emitting portion 510 is heated. Where convection A
F has the highest temperature on the upper side in the vertical direction of the arc AR, and the lowest temperature on the lower side in the vertical direction of the arc AR. Therefore, the wall portion of the light emitting portion 510 that is in contact with the convection AF on the upper side in the vertical direction of the arc AR becomes the hottest portion having the highest temperature in the discharge lamp main body 90a (discharge lamp 90). Further, the wall portion of the light emitting portion 510 that is in contact with the convection AF on the lower side in the vertical direction of the arc AR becomes the coldest portion having the lowest temperature in the discharge lamp main body 90a (discharge lamp 90).

In the example of FIG. 3, since the first wall 510a is located on the upper side in the vertical direction of the arc AR, the first wall 510a is the hottest part having the highest temperature. On the other hand, since the 2nd wall part 510b is located in the perpendicular direction lower side of the arc AR, the 2nd wall part 510b turns into the coldest part which becomes the lowest temperature.

As shown in FIG. 2, the reflecting mirror 112 is fixed to the first end 9 of the discharge lamp 90 by a fixing member 114.
It is fixed at 0e1. The reflecting mirror 112 is on the side opposite to the irradiation direction D (rear side,
The light traveling toward (−X side) is reflected toward the irradiation direction D (front side, + X side). Reflector 1
The shape of the 12 reflecting surfaces 112a (the surface on the discharge lamp 90 side) is not particularly limited as long as the discharge light can be reflected in the irradiation direction D. For example, even if it is a spheroidal shape, it is a rotating parabolic shape. It may be. For example, when the shape of the reflecting surface 112a of the reflecting mirror 112 is a parabolic shape, the reflecting mirror 112 can convert the discharge light into light substantially parallel to the optical axis AX.
Thereby, the collimating lens 305 can be omitted.

The material of the fixing member 114 is not particularly limited as long as it is a heat resistant material that can withstand the heat generated from the discharge lamp 90, and is, for example, an inorganic adhesive.

FIG. 4 is a diagram illustrating an example of a circuit configuration of the discharge lamp lighting device 10 and the control unit 40.
As shown in FIG. 4, the discharge lamp lighting device 10 includes a power control circuit 20, a polarity inversion circuit 30, an operation detection unit 60, and an igniter circuit 70.

The power control circuit 20 generates driving power to be supplied to the discharge lamp 90. In the present embodiment, the power control circuit 20 includes a down chopper circuit that receives the voltage from the DC power supply device 80 as an input, steps down the input voltage, and outputs a DC current Id.

The power control circuit 20 includes a switch element 21, a diode 22, a coil 23, and a capacitor 24. The switch element 21 is composed of, for example, a transistor. In the present embodiment, one end of the switch element 21 is connected to the positive voltage side of the DC power supply device 80, and the other end is connected to the cathode terminal of the diode 22 and one end of the coil 23.

One end of a capacitor 24 is connected to the other end of the coil 23, and the other end of the capacitor 24 is connected to the anode terminal of the diode 22 and the negative voltage side of the DC power supply device 80. A current control signal is input from the control unit 40 to the control terminal of the switch element 21 to switch the switch element 2.
ON / OFF of 1 is controlled. Examples of the current control signal include PWM (Pulse Wi
dth Modulation) control signal may be used.

When the switch element 21 is turned on, a current flows through the coil 23 and energy is stored in the coil 23. Thereafter, when the switch element 21 is turned OFF, the energy stored in the coil 23 is released through a path passing through the capacitor 24 and the diode 22. As a result, a direct current Id corresponding to the proportion of time during which the switch element 21 is turned on is generated.

The polarity inversion circuit 30 inverts the polarity of the direct current Id input from the power control circuit 20 at a predetermined timing. As a result, the polarity inversion circuit 30 generates and outputs a drive current I that is a direct current that lasts for a controlled time, or a drive current I that is an alternating current having an arbitrary frequency. In the present embodiment, the polarity inverting circuit 30 is configured by an inverter bridge circuit (full bridge circuit).

The polarity inversion circuit 30 is, for example, a first switch element 3 constituted by a transistor or the like.
1, second switch element 32, third switch element 33, and fourth switch element 34
Is included. The polarity inversion circuit 30 includes a first switch element 31 and a second switch connected in series.
The switch element 32 and the third switch element 33 and the fourth switch element 34 connected in series are connected in parallel to each other. The polarity inversion control signal is input from the control unit 40 to the control terminals of the first switch element 31, the second switch element 32, the third switch element 33, and the fourth switch element 34, respectively. Based on this polarity inversion control signal, the ON / OFF operation of the first switch element 31, the second switch element 32, the third switch element 33, and the fourth switch element 34 is controlled.

In the polarity inverting circuit 30, the first switch element 31 and the fourth switch element 34.
Then, the operation of alternately turning on / off the second switch element 32 and the third switch element 33 is repeated. Thereby, the polarity of the direct current Id output from the power control circuit 20 is alternately inverted. The polarity inversion circuit 30 is controlled from the common connection point between the first switch element 31 and the second switch element 32 and the common connection point between the third switch element 33 and the fourth switch element 34. A drive current I that is a direct current that continues the same polarity state or a drive current I that is an alternating current having a controlled frequency is generated and output.

That is, the polarity inverting circuit 30 includes the first switch element 31 and the fourth switch element 3.
When 4 is ON, the second switch element 32 and the third switch element 33 are OFF, and when the first switch element 31 and the fourth switch element 34 are OFF, the second switch element 32 and the third switch element 32 Control is performed so that the switch element 33 is ON. Therefore, when the first switch element 31 and the fourth switch element 34 are ON, the drive current I flowing from the one end of the capacitor 24 in the order of the first switch element 31, the discharge lamp 90, and the fourth switch element 34 is generated. To do. Second switch element 32 and third switch element 33
Is ON, the third switch element 33, the discharge lamp 90,
A drive current I that flows in the order of the second switch element 32 is generated.

In the present embodiment, the combined portion of the power control circuit 20 and the polarity inversion circuit 30 corresponds to the discharge lamp driving unit 230. That is, the discharge lamp driving unit 230 supplies the driving current I for driving the discharge lamp 90 to the discharge lamp 90.

The operation detection unit 60 includes a voltage detection unit that detects the lamp voltage of the discharge lamp 90 and outputs lamp voltage information to the control unit 40. The operation detection unit 60 detects the drive current I and controls the control unit 40.
Includes a current detector for outputting drive current information. In the present embodiment, the operation detection unit 6
0 includes a first resistor 61, a second resistor 62, and a third resistor 63.

In the present embodiment, the voltage detection unit of the operation detection unit 60 detects the lamp voltage by the voltage divided by the first resistor 61 and the second resistor 62 connected in series with each other in parallel with the discharge lamp 90. In the present embodiment, the current detector is a third connected in series to the discharge lamp 90.
The drive current I is detected by the voltage generated in the resistor 63.

The igniter circuit 70 operates only when the discharge lamp 90 starts to be lit. The igniter circuit 70 is a high voltage (discharge) necessary for forming a discharge path by dielectric breakdown between the electrodes of the discharge lamp 90 (between the first electrode 92 and the second electrode 93) at the start of lighting of the discharge lamp 90. (A voltage higher than that during normal lighting of the lamp 90) is supplied between the electrodes of the discharge lamp 90 (between the first electrode 92 and the second electrode 93). In the present embodiment, the igniter circuit 70 is connected in parallel with the discharge lamp 90.

The control unit 40 controls various operations from the start of operation of the projector 500 to the stop of operation. The control unit 40 controls the discharge lamp driving unit 230 according to the driving current waveform of the driving current I. Further, the control unit 40 controls the cooling unit 50. In the example of FIG. 4, the control unit 40 controls the power control circuit 20 and the polarity inversion circuit 30 to set parameters such as a holding time for the drive current I to maintain the same polarity, a current value of the drive current I, and a frequency. Control. Control unit 4
0 represents the drive current I with respect to the polarity inversion circuit 30 according to the polarity inversion timing of the drive current I.
The polarity inversion control is performed to control the holding time, the frequency of the drive current I, and the like that continue with the same polarity.
The control unit 40 performs current control for controlling the current value of the output direct current Id on the power control circuit 20.

The configuration of the control unit 40 is not particularly limited. In the present embodiment, the control unit 40 includes a system controller 41, a power control circuit controller 42, and a polarity inversion circuit controller 43. Note that a part or all of the control unit 40 may be configured by a semiconductor integrated circuit.

The system controller 41 controls the power control circuit 20 and the polarity inversion circuit 30 by controlling the power control circuit controller 42 and the polarity inversion circuit controller 43. The system controller 41 may control the power control circuit controller 42 and the polarity inversion circuit controller 43 based on the lamp voltage and the drive current I detected by the operation detection unit 60.

In the present embodiment, a storage unit 44 is connected to the system controller 41.
The system controller 41 may control the power control circuit 20 and the polarity inversion circuit 30 based on information stored in the storage unit 44. The storage unit 44 may store, for example, information related to drive parameters such as a holding time during which the drive current I continues with the same polarity, a current value of the drive current I, a frequency, a waveform, and a modulation pattern.

The power control circuit controller 42 controls the power control circuit 20 by outputting a current control signal to the power control circuit 20 based on the control signal from the system controller 41.

The polarity inversion circuit controller 43 controls the polarity inversion circuit 30 by outputting a polarity inversion control signal to the polarity inversion circuit 30 based on the control signal from the system controller 41.

The control unit 40 is realized using a dedicated circuit, and can perform the above-described control and various types of control of processing to be described later. On the other hand, for example, the control unit 40 can function as a computer by executing a control program stored in the storage unit 44 to perform various controls of these processes.

FIG. 5 is a diagram for explaining another configuration example of the control unit 40. As shown in FIG. 5, the control unit 40 includes a current control unit 40 that controls the power control circuit 20 according to a control program.
-1, it may be configured to function as polarity inversion control means 40-2 for controlling the polarity inversion circuit 30.

1 cools the discharge lamp 90 by sending cooling air to the discharge lamp 90. In the present embodiment, the cooling unit 50 can change the blowing direction of the cooling air, and can blow air toward a plurality of different parts in the discharge lamp 90. Details of the cooling unit 50 will be described later.

The input unit 45 is a part that receives a predetermined operation by the user. The input unit 45 accepts user operations such as turning on / off the power of the projector 500 and changing the lighting mode, for example. In the present embodiment, the input unit 45 is connected to the control unit 40. When the user's operation is received, the input unit 45 outputs an operation signal corresponding to the operation to the control unit 40.

The method by which the input unit 45 receives an operation is not particularly limited. For example, the input unit 45 may accept an operation by pressing various buttons attached to the housing of the projector 500 or may accept an operation by a signal sent from a remote controller of the projector 500.

Hereinafter, the circuit configuration of the projector 500 will be described.
FIG. 6 is a diagram illustrating an example of a circuit configuration of the projector 500 according to the present embodiment. In addition to the configuration shown in FIG. 1, the projector 500 includes an image signal converter 501, a DC power supply device 80, liquid crystal panels 560R, 560G, and 560B, and an image processing device 57, as shown in FIG.
0.

The image signal conversion unit 501 converts an image signal 502 (such as a luminance-color difference signal or an analog RGB signal) input from the outside into a digital RGB signal having a predetermined word length, and converts the image signal 512.
R, 512G, and 512B are generated and supplied to the image processing apparatus 570.

The image processing device 570 performs image processing on each of the three image signals 512R, 512G, and 512B. The image processing device 570 receives drive signals 572R, 572G, and 572B for driving the liquid crystal panels 560R, 560G, and 560B, respectively.
Supplied to 560G and 560B.

The DC power supply device 80 converts an AC voltage supplied from an external AC power supply 600 into a constant DC voltage. The DC power supply device 80 includes an image signal conversion unit 501 on the secondary side of a transformer (not shown, but included in the DC power supply device 80), an image processing device 570, and a discharge lamp lighting device 10 on the primary side of the transformer. Supply DC voltage.

The discharge lamp lighting device 10 generates a high voltage between the electrodes of the discharge lamp 90 at the time of startup, and causes a dielectric breakdown to form a discharge path. Thereafter, the discharge lamp lighting device 10 supplies the drive current I for the discharge lamp 90 to maintain the discharge.

The liquid crystal panels 560R, 560G, and 560B include the liquid crystal light valves 330R and 3 described above.
30G and 330B are provided. Liquid crystal panel 560R, 560G, 560B
Modulates the transmittance (luminance) of color light incident on the liquid crystal panels 560R, 560G, and 560B via the optical system described above based on the drive signals 572R, 572G, and 572B, respectively.

Next, the cooling unit 50 will be described in detail. As shown in FIG. 2, in the present embodiment, the cooling unit 50 includes a blower 51 and wind direction changing units 53 and 54.
The air blower 51 is disposed obliquely in front of the light emitting unit 510 in the vertical direction. Blower 5
1 is, for example, a sirocco fan. The blower 51 has a cylindrical blower nozzle 51a that extends toward the first wall 510a, which is the upper end of the discharge lamp 90 in the vertical direction. The tip of the blower nozzle 51a is a blower opening 51b that opens. In the present embodiment, the blowing nozzle 51a
Is extending from the main body of the blower 51 obliquely rearward in the vertical direction. The blower 51 sucks the cooling air inside and outside the housing of the projector 500 and discharges the air through the blower port 51b. Thereby, the blower 51 blows cooling air to the discharge lamp 90.

The wind direction changing portions 53 and 54 are shutters provided on both sides of the air blowing nozzle 51a in the front-rear direction X, respectively. The wind direction changing portion 53 is provided on the rear side (−X side) of the blower nozzle 51a. The wind direction change part 54 is provided in the front side (+ X side) of the ventilation nozzle 51a. The wind direction change parts 53 and 54 are inclined and extended in the direction positioned on the rear side from the upper side in the vertical direction toward the lower side in the vertical direction. The inclination with respect to the vertical direction Z of the wind direction change part 53 is smaller than the inclination with respect to the vertical direction Z of the ventilation nozzle 51a. The inclination with respect to the vertical direction Z of the wind direction change part 54 is larger than the inclination with respect to the vertical direction Z of the ventilation nozzle 51a.

The wind direction changing portions 53 and 54 are provided so as to be movable along the extending direction of the wind direction changing portions 53 and 54. By moving the wind direction changing parts 53 and 54, the flow of the wind discharged from the blower port 51b is changed, and the blowing direction of the blower 51 (cooling part 50) is changed. In FIG. 2, both the wind direction change parts 53 and 54 are the states arrange | positioned at the base end side of the ventilation nozzle 51a rather than the ventilation opening 51b. In this state, the wind direction changing portions 53 and 54 do not contact the wind discharged from the blower port 51b and do not change the blowing direction of the blower 51. In a state where the air blowing direction is not changed by the air direction changing portions 53 and 54, the air blowing direction of the air blowing device 51 is a steady air blowing direction (first air blowing direction) BD1 for blowing air toward the first wall portion 510a of the light emitting portion 510. here,
In the present embodiment, the first wall portion 510a corresponds to a predetermined part.

FIG. 7 is a diagram illustrating a state in which the blowing direction of the blower 51 is changed by the wind direction changing unit 53. FIG. 8 is a diagram illustrating a state in which the blowing direction of the blower 51 is changed by the wind direction changing unit 54. 7 and 8 show a case where the discharge lamp 90 is turned off. Note that FIG.
And in FIG. 8, illustration of the control part 40 is abbreviate | omitted.

As shown in FIG. 7, the wind direction changing portion 53 moves obliquely downward in the vertical direction along the extending direction and covers a part on the extension line of the air outlet 51 b, thereby being discharged from the air outlet 51 b. A part of the wind comes into contact with the wind direction changing portion 53. As a result, the blowing direction of the blowing device 51 is changed to the wind direction changing portion 53.
It can be changed in the direction along the stretching direction. In the present embodiment, the blowing direction of the blowing device 51 that is changed by the wind direction changing unit 53 is the unlit blowing direction (second blowing direction) BD2 that blows air toward the fourth wall portion 510d. The turn-off air blowing direction BD2 is the steady air blowing direction B
This is a direction in which the inclination with respect to the vertical direction Z is smaller than D1.

As shown in FIG. 8, the wind direction changing portion 54 moves obliquely downward in the vertical direction along the extending direction and covers a part on the extension line of the air outlet 51 b, thereby being discharged from the air outlet 51 b. A part of the wind comes into contact with the wind direction changing portion 54. As a result, the blowing direction of the blowing device 51 is changed to the wind direction changing unit 54.
It can be changed in the direction along the stretching direction. In the present embodiment, the blowing direction of the blowing device 51 that is changed by the wind direction changing unit 54 is the unlit blowing direction (second blowing direction) BD3 that blows air toward the third wall 510c. The turn-off air blowing direction BD3 is the steady air blowing direction B
This is a direction having a larger inclination with respect to the vertical direction Z than D1.

As described above, the wind direction changing units 53 and 54 change the blowing direction of the blowing device 51.
In the present embodiment, the third wall portion 510c and the fourth wall portion 510d are arranged at either one of the end portions in the front-rear direction X of the light emitting portion 510 different from the first wall portion 510a as the predetermined portion. Equivalent to.

As shown in FIG. 2, when the discharge lamp 90 is in a steady lighting state, the controller 40 blows the blower 5.
The blowing direction of 1 (cooling unit 50) is defined as a steady blowing direction BD1. That is, the control unit 40
The cooling unit 50 is controlled to blow air toward the first wall 510a. Thereby, the discharge lamp 9
It can suppress that the temperature of 0 rises too much.

After the discharge lamp 90 is extinguished, the control unit 40 causes the cooling unit 50 to discharge the discharge lamp 90 for a predetermined time.
Cool down. As shown in FIG. 7 and FIG. 8, the control unit 40, when the discharge lamp 90 is turned off,
The blowing direction of the blower 51 (cooling unit 50) is set to the blowing direction BD2 when turned off and the blowing direction BD when turned off.
3 and the air blowing direction of any one of them. That is, the control unit 40 includes the third wall portion 510.
The cooling unit 50 is controlled to blow air toward either one of c and the fourth wall portion 510d. More specifically, in the present embodiment, the control unit 40, when the discharge lamp 90 is turned off,
The wind direction changing unit 53 or the wind direction changing unit 54 is moved to change the blowing direction of the blowing device 51 from the steady blowing direction BD1 to the unlit blowing direction BD2 or the unlit blowing direction BD3.

In the present embodiment, the blowing direction of the cooling unit 50 when the discharge lamp 90 is turned off is set in advance to, for example, one of the turning-off blowing direction BD2 and the turning-off blowing direction BD3, and the storage unit 44 Stored in When the discharge lamp 90 is turned off, the control unit 40 refers to the storage unit 44 and sets the blowing direction of the cooling unit 50 to the blowing direction BD2 when turned off and the blowing direction BD3 when turned off.
And decide which one to use.

The control unit 40 controls the air blowing direction of the cooling unit 50 based on, for example, an operation performed by the user on the input unit 45 to turn off the power of the projector 500. The control unit 40 performs an operation to turn off the power of the projector 500 on the input unit 45, so that the discharge lamp 9
Preparation for changing the air blowing direction of the cooling unit 50 is performed while starting the operation of turning off 0. And the control part 40 changes the ventilation direction of the cooling part 50. FIG.

The predetermined time for cooling the discharge lamp 90 by the cooling unit 50 after the discharge lamp 90 is extinguished can be, for example, longer than the time until the light emitting unit 510 is cooled and the mercury Hg in the discharge space 91 is condensed. The predetermined time for cooling the discharge lamp 90 by the cooling unit 50 after the discharge lamp 90 is turned off may be shorter than the time until the mercury Hg in the discharge space 91 is condensed.

The projector 500 including the control unit 40 that performs the above-described control can also be expressed as a projector control method. That is, one aspect of the projector control method according to the present embodiment includes the first electrode 92 and the second electrode 93 as a pair of electrodes, and emits light to the discharge lamp 90 and the discharge lamp 90. And a cooling unit 50 that cools the discharge lamp 90. The discharge lamp 90 includes a light emitting unit 510 that includes a discharge space 91 therein, and includes a first electrode 92 and a second electrode. 93 are disposed in the discharge space 91 so as to face each other in the front-rear direction X, and when the discharge lamp 90 is in a steady lighting state, the air blowing direction of the cooling unit 50 is directed toward the first wall 510a of the light emitting unit 510. When the discharge direction is set to BD1 for blowing air and the discharge lamp 90 is turned off, the air blowing direction of the cooling unit 50 is different from that of the first wall 510a.
It is set as the ventilation direction BD2, BD3 at the time of light extinction which blows toward any one edge part among the edge parts in the front-back direction X of 10.

According to this embodiment, when the discharge lamp 90 is extinguished, the control unit 40 blows the air blowing direction of the cooling unit 50 toward one of the end portions in the front-rear direction X of the light emitting unit 510. Since it is set as the ventilation direction at the time of turning off, it can suppress that a mercury bridge arises. Details will be described below.

FIG. 13 is a diagram illustrating a state after the discharge lamp 90 is turned off in the comparative example. In the comparative example, when the discharge lamp 90 is extinguished, cooling of the discharge lamp 90 by the cooling unit 50 is stopped, or the discharge lamp 90 is moved by the cooling unit 50 while the blowing direction by the cooling unit 50 is set to the steady blowing direction BD1. Cool for a predetermined time. In such a case, after the discharge lamp 90 is turned off, the light emitting unit 51 is turned off.
Among the 0, the first electrode 92, and the second electrode 93, mercury Hg is condensed and deposited sequentially from the portion where the temperature is equal to or lower than the condensation temperature of mercury Hg. Therefore, the mercury Hg condensation position becomes irregular, and the mercury bridge in which the first electrode 92 and the second electrode 93 are connected by the mercury Hg attached to the first electrode 92 and the second electrode 93 as shown in FIG. May occur. In addition, for example, mercury Hg condensed and attached to the inner wall of the light emitting unit 510 may move and adhere to the first electrode 92 and the second electrode 93 to form a mercury bridge. When the mercury bridge is generated, there is a problem that the first electrode 92 and the second electrode 93 are short-circuited and the discharge lamp 90 cannot be turned on.

With respect to this problem, according to the present embodiment, the control unit 40 sets the blowing direction of the cooling unit 50 when the discharge lamp 90 is extinguished to one of the end portions in the front-rear direction X of the light emitting unit 510. It is set as the air blowing direction when the air is blown toward the part. FIG. 9 is a diagram illustrating a state after the discharge lamp 90 is turned off when the blowing direction of the cooling unit 50 is set to the turned-off blowing direction BD2. For example, as shown in FIG. 9, when the blowing direction of the cooling unit 50 when the discharge lamp 90 is turned off is the turned-off blowing direction BD2, the fourth wall portion 510d is intensively cooled. Therefore, the temperature of the fourth wall portion 510d tends to be lower than the condensation temperature of mercury Hg earlier than the other portions of the light emitting portion 510. Thereby, the position where mercury Hg condenses is located on the fourth wall 510d side (front side, +
Concentrate on the X side). Accordingly, mercury H is provided at a position connecting the first electrode 92 and the second electrode 93.
It is difficult for g to condense and it is possible to suppress the occurrence of a mercury bridge.

Further, the fourth wall portion 510d is intensively cooled, whereby the core rod 543 of the second electrode 93 connected to the fourth wall portion 510d is also cooled, and the temperature of the core rod 543 is equal to or lower than the condensation temperature of mercury Hg. Mercury Hg adheres also to the core rod 543. For this reason, it is possible to suppress movement in the discharge space 91 after the mercury Hg is condensed. Therefore, the occurrence of mercury bridge can be further suppressed.

In the above description, the case where the air blowing direction of the cooling unit 50 when the discharge lamp 90 is extinguished is referred to as the air blowing direction BD2 during extinguishing, but the air blowing direction of the cooling unit 50 when the discharge lamp 90 is extinguished is illustrated in FIG. Similarly, in the case of the turn-off air blowing direction BD3 shown in FIG. In this case, after the discharge lamp 90 is extinguished, the position where the mercury Hg is condensed concentrates on the third wall 510c side (rear side, −X side) in the discharge space 91.

Moreover, according to this embodiment, since the air blowing direction of the air blower 51 can be changed by the wind direction changing parts 53 and 54, with one air blower 51, the steady air blowing direction BD1 and the turn-off air blowing directions BD2 and BD3. The air blowing direction can be switched. Therefore, the number of parts constituting the cooling unit 50 can be reduced.

In addition, for example, the reflecting mirror 112 may have a large heat capacity and the temperature is unlikely to decrease. In this case, the temperature of the end of the light emitting unit 510 on the side where the reflecting mirror 112 in the front-rear direction X is attached (one side in the first direction), that is, the temperature of the third wall 510c is maintained to some extent by the reflecting mirror 112. . Therefore, the temperature of the third wall portion 510c is the temperature of the end portion of the light emitting portion 510 on the opposite side (the other side in the first direction) to the side where the reflecting mirror 112 in the front-rear direction X is attached, that is, the temperature of the fourth wall portion 510d. It may be difficult to lower than the temperature. In other words, the fourth wall 5
The temperature of 10d may be more likely to be lower than the temperature of the third wall portion 510c.

Therefore, the blowing direction (second blowing direction) of the cooling unit 50 when the discharge lamp 90 is turned off is
In the case of the turn-off air blowing direction BD2 for blowing air toward the fourth wall 510d, the fourth wall 51
It is easy to suitably reduce the temperature of 0d. Thereby, the temperature of the light emitting unit 510 is partially reduced, and mercury Hg is more easily collected and condensed in a specific part. Therefore, it can suppress more that a mercury bridge arises.

Further, according to the present embodiment, the predetermined portion of the light emitting unit 510 that is blown when the discharge lamp 90 is in a steady lighting state by the cooling unit 50 is the end (first wall portion) on the upper side in the vertical direction of the light emitting unit 510. 510a). As described above, the upper end of the light emitting unit 510 in the vertical direction is the hottest part in the light emitting unit 510. Therefore, when the discharge lamp 90 is in a steady lighting state, the discharge lamp 9 is blown toward the end (first wall 510a) on the upper side in the vertical direction of the light emitting unit 510.
0 can be efficiently cooled.

Further, according to the present embodiment, the control unit 40 controls the blowing direction of the cooling unit 50 based on an operation performed by the user for the input unit 45 to turn off the power of the projector 500. Therefore, preparation can be made to change the blowing direction of the cooling unit 50 before the discharge lamp 90 is turned off, and when the discharge lamp 90 is turned off, the blowing direction of the cooling unit 50 can be changed at a suitable timing. it can.

  In the present embodiment, the following configurations and methods may be employed.

In the present embodiment, the blowing direction of the cooling unit 50 when the discharge lamp 90 is extinguished is the same as the third wall 5.
In the case of the turn-off air blowing direction BD3 for blowing air toward 10c, for example, a configuration as shown in FIG. 10 can be adopted.

FIG. 10 is a diagram showing a light source device 1200 which is another example in the present embodiment. FIG.
0 indicates a case where the discharge lamp 90 is turned off. In addition, illustration of the control part 40 is abbreviate | omitted in FIG.

As illustrated in FIG. 10, the light source device 1200 includes a reflecting mirror cooling unit 152. The reflecting mirror cooling unit 152 is disposed on the side opposite to the reflecting surface 112a of the reflecting mirror 112 (rear side, -X side).
The reflector cooling unit 152 is, for example, a sirocco fan. The reflecting mirror cooling unit 152 cools the reflecting mirror 112 when the discharge lamp 90 is turned off. More specifically, the reflector cooling unit 152 is
Air is blown to the surface of the reflecting mirror 112 opposite to the reflecting surface 112a to cool the reflecting mirror 112. FIG.
, The reflecting mirror cooling unit 152 cools the reflecting mirror 112 by sending air from the obliquely upper rear side of the reflecting mirror 112 to the obliquely lower front side. Other configurations of the light source device 1200 are the same as the configurations of the light source device 200 described above.

According to this configuration, the cooling of the third wall 510 c by the cooling unit 50 can be indirectly assisted by cooling the reflecting mirror 112 by the reflecting mirror cooling unit 152. Therefore, when cooling the 3rd wall part 510c with the cooling part 50, ie, when the ventilation direction of the cooling part 50 when the discharge lamp 90 is extinguished is the ventilation direction BD3 at the time of extinction, it suppresses more that a mercury bridge arises. it can.

In the present embodiment, the position where the reflecting mirror cooling unit 152 is disposed is not particularly limited. The reflecting mirror cooling unit 152 is, for example, on the opposite side (−X side) with respect to the reflecting mirror 112 and on the lower side in the vertical direction (−Z side) or on the opposite side (−X side) with respect to the reflecting mirror 112. And may be arranged at a position on either one side (+ Y side, -Y side) in the horizontal direction.

In the present embodiment, as described above, when the discharge lamp 90 is in a steady lighting state, the blower device 51 supplies cooling air to the first wall portion 510a that is the upper end portion of the light emitting portion 510 in the vertical direction. If it is the structure which can ventilate, the position in which the air blower 51 is arrange | positioned will not be specifically limited. For example, the blower device 51 is disposed at a position on the lower side in the vertical direction (−Z side) of the light emitting unit 510 or the lateral direction of the light emitting unit 510 (+ Y side, −Y side). Blower nozzle 51
It is good also as a structure which a extends to the vertical direction upper side of the light emission part 510 from the arrangement position of the air blower 51, and is connected to the air outlet 51b of the air blower 51 as another member, and the light emission part 510 of the light emission part 510 is connected. A duct or the like extending to the upper side in the vertical direction may be provided.

In the present embodiment, the cooling unit 50 has both the wind direction changing unit 53 and the wind direction changing unit 54. However, the present invention is not limited to this. The cooling unit 50 may include any one of the wind direction changing unit 53 and the wind direction changing unit 54. Thereby, the cooling unit 50 can cool either one of the end portions (the third wall portion 510c and the fourth wall portion 510d) in the front-rear direction X of the light emitting portion 510.

Further, in the present embodiment, the controller 40 controls the wind direction changing unit 5 when the discharge lamp 90 is turned off.
3 and the wind direction changing portion 54 are moved, and the air blowing direction is changed by bringing the one air direction changing portion into contact with the cooling air discharged from the air blowing port 51b of the blowing device 51. It is not limited to this. Conversely, when the discharge lamp 90 is in a steady lighting state, the control unit 40 causes one of the airflow direction changing units to contact the cooling air discharged from the air blowing port 51b of the air blowing device 51 so that the cooling air is vertically directed to the light emitting unit 510. When the discharge lamp 90 is turned off when the discharge lamp 90 is turned off, the wind direction changing portion is moved to a position where it does not come into contact with the cooling air from the blower 51 and the cooling air is moved to the end portion in the front-rear direction X of the light emitting portion 510. It is good also as a structure to blow.

Moreover, in this embodiment, the control part 40 is the ventilation direction B at the time of extinguishing whenever the discharge lamp 90 extinguishes.
It may be determined which direction is selected from D2 and the turn-off air blowing direction BD3. In this case, the control unit 40 may determine the blowing direction based on the temperature information of the light emitting unit 510, for example. Specifically, the control unit 40, when the discharge lamp 90 is turned off, the third wall portion 510c.
You may control the ventilation direction of the cooling part 50 so that it may become a ventilation direction toward the wall part with a low temperature among the temperature of this, and the temperature of the 4th wall part 510d.

Further, in the present embodiment, the control unit 40, based on the fact that the discharge lamp 90 is turned off when the operation for turning off the power of the projector 500 is not input to the input unit 45 and the discharge lamp 90 is turned off, You may change 50 ventilation directions. Projector 5 in input unit 45
For example, when the discharge lamp 90 is extinguished without inputting an operation to turn off the power of 00, for example,
This is a case where the power cord of the projector 500 is directly removed from the outlet. In this case, the projector 500 includes an internal battery, for example, and operates the cooling unit 50 with electric power supplied from the internal battery.

Moreover, the structure of a wind direction change part will not be specifically limited if the ventilation direction of the cooling part 50 can be changed. The wind direction changing portion is, for example, an axis (Y that is orthogonal to both the vertical direction Z and the front-rear direction X).
A rotation device that rotates the blower 51 around the axis may be used. By rotating the blower 51 by the turning device, the directions of the blower nozzle 51a and the blower port 51b can be changed, and the blowing direction of the blower 51 (cooling unit 50) can be changed.

Further, for example, the cooling unit 50 is provided in each of the plurality of flow paths through which the cooling air flows, and one end in the front-rear direction X of the light emitting part 510 and the end of the light emitting part 510 in the vertical direction. A plurality of air outlets for discharging cooling air toward the ends, respectively,
When the discharge lamp 90 is extinguished, the flow of the cooling air is switched from the flow path for cooling the vertical upper end of the light emitting section 510 to the flow path for cooling one end of the light emitting section 510 in the front-rear direction X. It may be a flow path switching mechanism.

In addition, the steady air blowing direction BD1 may be a direction in which air is blown toward a portion other than the first wall portion 510a of the light emitting unit 510 as long as the air blowing direction at the time of extinction is different from the portion of the light emitting unit 510 that blows air.

Second Embodiment
The second embodiment is different from the first embodiment in that the cooling unit includes a first blower and a second blower. In addition, about the structure similar to the said embodiment, description may be abbreviate | omitted by attaching | subjecting the same code | symbol suitably.

FIG. 11 is a diagram showing a light source device 2200 of the present embodiment. FIG. 11 shows a case where the discharge lamp 90 is turned off. In addition, illustration of the control part 40 is abbreviate | omitted in FIG.

As shown in FIG. 11, the light source device 2200 according to the present embodiment includes a cooling unit 250. The cooling unit 250 includes a first blower 251 and a second blower 252. First blower 2
Unlike the air blower 51 of 1st Embodiment, the wind direction change parts 53 and 54 are not provided in 51. FIG. Other configurations of the first blower 251 are the same as those of the blower 51. That is, the blowing direction of the first blower 251 is the steady blowing direction (first blowing direction) BD1 regardless of the lighting state of the discharge lamp 90.

The second blower 252 is disposed obliquely forward and downward in the vertical direction of the light emitting unit 510. Second
The blower 252 is a sirocco fan, for example. The second blower 252 has the third wall 5
It has a cylindrical blowing nozzle 252a extending toward 10c. In the present embodiment, the air blowing nozzle 252a extends from the main body of the second air blowing device 252 obliquely upward in the vertical direction.
The 2nd air blower 252 is the air blower similar to the 1st air blower 251 except the point from which the position and attitude | position from which it is arrange | positioned differ, for example. The blowing direction of the second blower 252 is the third wall 51.
The turn-off air blowing direction (second air blowing direction) BD4 that blows air toward 0c.

In the present embodiment, the control unit 40 cools the discharge lamp 90 by the first blower 251 when the discharge lamp 90 is in a steady lighting state. That is, when the discharge lamp 90 is in a steady lighting state, the control unit 40 sets the blowing direction of the cooling unit 250 as the steady blowing direction BD1, as indicated by a two-dot chain line in FIG. More specifically, when the discharge lamp 90 is in a steady lighting state, the first blower 251 blows cooling air toward the first wall 510a of the light emitting unit 510. In addition, when the discharge lamp 90 is in a steady lighting state, the blowing by the second blower 252 is stopped. On the other hand, when the discharge lamp 90 is turned off, the control unit 40 stops the blowing by the first blower 251, starts the blowing by the second blower 252, and cools the discharge lamp 90 by the second blower 252. To do. That is, when the discharge lamp 90 is turned off, the control unit 40 cools the cooling unit 25.
The blowing direction of 0 is defined as a blowing direction BD4 when extinguished. More specifically, the second blower 252 blows cooling air toward the third wall 510c of the light emitting unit 510 when the discharge lamp 90 is turned off. Other configurations of the light source device 2200 are the same as the configurations of the light source device 200 of the first embodiment.

According to the present embodiment, when the discharge lamp 90 is extinguished, the second blower 252 performs the third operation.
Since the air can be blown toward the wall 510c, the third wall 510c can be intensively cooled. Thereby, the temperature of the 3rd wall part 510c can be reduced, and condensation of mercury Hg can be produced intensively. Therefore, according to this embodiment, it can suppress that a mercury bridge arises.

Further, according to the present embodiment, the cooling unit 250 causes the first blower 251 to cool the discharge lamp 90 when the discharge lamp 90 is in a steady lighting state, and the discharge lamp 90 when the discharge lamp 90 is turned off. A second blower 252 for cooling is provided. Therefore, there is no need to provide a wind direction changing unit that changes the blowing direction. For example, the cooling unit 250 using only an existing blowing device.
Can be configured. Thereby, the structure of the cooling unit 250 can be simplified.

Further, according to the present embodiment, when the discharge lamp 90 is turned off, the control unit 40 stops the blowing by the first blower 251 and starts the blowing by the second blower 252. for that reason,
The second air blower 252 can easily cool the third wall portion 510c, and can further suppress the occurrence of a mercury bridge. Further, the power consumption of the projector can be reduced as compared with the case where the first blower 251 is not stopped.

In the present embodiment, the second blower 252 may be a blower that blows air toward the fourth wall portion 510d.

Moreover, in this embodiment, when the discharge lamp 90 turned off, the control part 40 stopped the ventilation by the 1st air blower 251. However, it is not limited to this. The control unit 40 is configured such that the amount of cooling air blown by the first blower 251 when the discharge lamp 90 is turned off is sufficiently smaller than the amount of cooling air blown by the second blower 252 when the discharge lamp 90 is turned off. For example, it is not necessary to stop the first blower 251 when the discharge lamp 90 is turned off.

Moreover, in this embodiment, the reflector cooling part 152 of the said embodiment is employ | adopted and the control part 40 is used.
The cooling mirror 112 may be cooled when the discharge lamp 90 is turned off.

Further, in the present embodiment, as described above, the second blower 252 is configured to blow cooling air to one end portion in the front-rear direction X of the light emitting unit 510 when the discharge lamp 90 is turned off as described above. The position where the second blower is disposed is not particularly limited, as is the case with the blower 51 in the above embodiment.

<Third Embodiment>
3rd Embodiment differs in the attitude | position by which a light source unit is arrange | positioned with respect to 1st Embodiment. In addition, about the structure similar to the said embodiment, description may be abbreviate | omitted by attaching | subjecting the same code | symbol suitably.

FIG. 12 is a diagram showing a light source device 3200 of the present embodiment. In FIG. 12, illustration of the control unit 40 is omitted. As illustrated in FIG. 12, the light source device 3200 of the present embodiment includes a light source unit 3210 and a cooling unit 350. The light source unit 3210 is different from the light source unit 210 of the first embodiment in that the orientation of the light source unit 3210 is rotated by 90 °. The posture of the light source unit 3210 is a posture in which the first electrode 92 and the second electrode 93 are arranged to face each other in the vertical direction Z. That is, in the present embodiment, the first direction in which the first electrode 92 and the second electrode 93 are arranged to face each other is the vertical direction Z. Other configurations of the light source unit 3210 are the same as those of the light source unit 210.

The cooling unit 350 is different from the cooling unit 50 of the first embodiment in that the posture in which the cooling unit 350 is disposed is rotated by 90 °. The relative arrangement and posture of the cooling unit 350 with respect to the light source unit 3210 are the same as the relative arrangement and posture of the cooling unit 50 with respect to the light source unit 210 of the first embodiment. In the present embodiment, the blowing direction of the cooling unit 350 that is changed by the wind direction changing unit 54 is a steady blowing direction (first blowing direction) for blowing air toward the third wall 510c.
BD5. In the present embodiment, the cooling unit 350 that is changed by the wind direction changing unit 53.
The air blowing direction is a turn-off air blowing direction (second air blowing direction) BD for blowing air toward the fourth wall portion 510d.
6. Other configurations of the cooling unit 350 are the same as those of the cooling unit 50.

In the present embodiment, the third wall portion 510 c is the end portion on the upper side in the vertical direction in the light emitting portion 510, and is the hottest portion in the light emitting portion 510. Therefore, when the discharge lamp 90 is in a steady lighting state, the control unit 40 sets the blowing direction of the cooling unit 350 to the steady blowing direction BD5 as shown by a two-dot chain line in FIG. It blows toward 510c. At this time, the blowing direction of the blowing device 51 is in a state changed by the wind direction changing unit 53.

On the other hand, when the discharge lamp 90 is turned off, the control unit 40 sets the blowing direction of the cooling unit 350 as the blowing-off blowing direction BD6 and blows air toward the fourth wall 510d by the cooling unit 350. At this time, the control unit 40 moves the wind direction changing unit 54 while accommodating the wind direction changing unit 53, and causes the air direction changing unit 54 to change the blowing direction of the blowing device 51 to the blowing direction BD <b> 6 when extinguished. Other configurations of the light source device 3200 are the same as the configurations of the light source device 200 of the first embodiment.

According to the present embodiment, when the discharge lamp 90 is turned off, air can be blown toward the fourth wall portion 510d, so that the fourth wall portion 510d can be intensively cooled. Thereby, the temperature of the 4th wall part 510d can be reduced, and condensation of mercury Hg can be produced intensively. Therefore, according to this embodiment, it can suppress that a mercury bridge arises.

Further, according to the present embodiment, the fourth wall portion 510d is an end portion on the lower side in the vertical direction of the light emitting portion 510. For this reason, the condensed mercury Hg is caused by its own weight to cause the fourth wall portion 5 in the discharge space 91.
It is easy to gather on the 10d side, and is easily attached to the second electrode 93 and entangled. Therefore, it can suppress that the condensed mercury Hg moves in the discharge space 91, and can suppress that a mercury bridge arises more.

In the present embodiment, for example, the blowing direction of the blowing device 51 is the wind direction changing unit 53,
The cooling unit 350 is set so as to be in the steady air blowing direction BD5 in a state not changed by 54.
May be arranged. In this case, the cooling unit 350 only needs to be provided with a wind direction changing unit that changes the blowing direction of the blower 51 to the blowing direction BD6 when the light is turned off. Further, in this case, as in the above embodiment, the control unit 40 determines that the blower 51 is used when the discharge lamp 90 is in a steady lighting state.
When the discharge lamp 90 is extinguished, the wind direction changing portion is housed and the cooling air from the blower 51 is directly blown to the fourth wall portion 510d. A configuration may be adopted.

Note that the projector of the present invention may have a configuration in which the light source device 3200 of the third embodiment described above includes a light source device that is vertically inverted. In the case of this configuration, the fourth wall portion 510 d is an upper end portion in the vertical direction in the light emitting portion 510, and the third wall portion 510 c is an end portion in the vertical direction in the light emitting portion 510. In this configuration, when the discharge lamp 90 is in a steady lighting state, the control unit 40 sets the blowing direction of the cooling unit 50 to the direction of blowing air toward the fourth wall portion 510d,
When the discharge lamp 90 is extinguished, the air blowing direction of the cooling unit 50 is set to the air blowing direction toward the third wall 510c.

Moreover, in embodiment mentioned above, a regular ventilation direction (1st ventilation direction) and the ventilation direction at the time of light extinction (2nd
However, the present invention is not limited to this. The steady blowing direction and the turn-off air blowing direction are directions in which air is blown toward different light emitting portions, and the turn-off air blowing direction is the first direction of the light emitting portion (a direction in which a pair of electrodes are arranged opposite to each other). If it is the direction which blows toward any one edge part among the edge parts in ()), it will not specifically limit. The steady blowing direction and the unlit blowing direction may be, for example, directions parallel to each other and facing the same direction. In this case, the position of the light emitting unit that blows air by moving the position of the cooling unit (blower device) without changing the posture may be changed, and the two air blowers are arranged in the horizontal direction as the same posture, You may vary the site | part of the light emission part ventilated from each ventilation apparatus.

In the present embodiment, as described above, when the discharge lamp 90 is in a steady lighting state, the blower 51 blows cooling air to the upper end of the light emitting unit 510 in the vertical direction, and the discharge lamp 90 is turned off. If it is the structure which can ventilate cooling air to the edge part of the vertical direction lower side of the light emission part 510, the position where the air blower 51 is arrange | positioned will not be specifically limited like the air blower in the said embodiment.

In each of the above-described embodiments, an example in which the present invention is applied to a transmissive projector has been described. However, the present invention can also be applied to a reflective projector. Here, the “transmission type” means that a liquid crystal light valve including a liquid crystal panel or the like is a type that transmits light. “Reflective type” means that the liquid crystal light valve reflects light. The light modulation device is not limited to a liquid crystal panel or the like, and may be a light modulation device using a micromirror, for example.

In each of the above embodiments, the three liquid crystal panels 560R, 560G, and 560B (
Although an example of the projector 500 using the liquid crystal light valves 330R, 330G, and 330B) has been described, the present invention can be applied to a projector using only one liquid crystal panel and a projector using four or more liquid crystal panels. is there.

Moreover, each structure demonstrated above can be suitably combined in the range which is not mutually contradictory.

DESCRIPTION OF SYMBOLS 40 ... Control part, 50, 250, 350 ... Cooling part, 51 ... Blower, 53, 54 ... Wind direction change part, 90 ... Discharge lamp, 91 ... Discharge space, 92 ... 1st electrode (electrode), 93 ... 2nd Electrodes (electrodes), 112 ... reflecting mirror, 152 ... reflecting mirror cooling unit, 251 ... first air blower, 252 ... second air blower, 330R, 330G, 330B ... liquid crystal light valve (light modulation device), 360 ... projection optics System, 500 ... projector, 510 ... light emitting unit, BD1, BD5 ... steady air blowing direction (first air blowing direction), BD2, BD3, BD4, BD6 ... air blowing direction (second air blowing direction), D
... irradiation direction (predetermined direction), Z ... vertical direction

Claims (9)

A discharge lamp having a pair of electrodes and emitting light;
A cooling unit for blowing air to the discharge lamp to cool the discharge lamp;
A control unit for controlling the cooling unit;
A light modulation device that modulates light from the discharge lamp according to image information;
A projection optical system that projects the light modulated by the light modulation device;
With
The discharge lamp has a light emitting part including a discharge space inside,
The pair of electrodes are disposed in the discharge space so as to face each other in the first direction,
The controller is
When the discharge lamp is in a steady lighting state, the air blowing direction of the cooling unit is a first air blowing direction for blowing air toward a predetermined part of the light emitting unit,
When the discharge lamp is extinguished, a second air blowing direction in which the air blowing direction of the cooling unit is blown toward one of the end portions in the first direction of the light emitting unit different from the predetermined portion. A projector characterized by that. The cooling unit includes a blower and a wind direction changing unit that changes a blowing direction of the blower,
2. The projector according to claim 1, wherein when the discharge lamp is turned off, the control unit changes the blowing direction of the blower from the first blowing direction to the second blowing direction by the wind direction changing unit. The cooling unit includes a first air blower in which the air blowing direction is the first air blowing direction, and a second air blower in which the air blowing direction is the second air blowing direction,
The control unit cools the discharge lamp by the first blower when the discharge lamp is in a steady lighting state, and cools the discharge lamp by the second blower when the discharge lamp is turned off. The projector according to claim 1. When the discharge lamp is extinguished, the control unit stops air blowing by the first blower,
The projector according to claim 3, wherein ventilation by the second blower is started. A reflection mirror that reflects the light emitted from the discharge lamp in a predetermined direction;
The reflecting mirror is fixed to one end of the first direction of the discharge lamp,
5. The projector according to claim 1, wherein the second air blowing direction is a direction in which air is blown toward an end portion on the other side of the first direction in the light emitting unit. A reflection mirror that reflects the light emitted from the discharge lamp in a predetermined direction;
The reflecting mirror is fixed to one end of the first direction of the discharge lamp,
5. The projector according to claim 1, wherein the second air blowing direction is a direction in which air is blown toward an end portion on the one side of the first direction in the light emitting unit. The projector according to claim 6, further comprising a reflector cooling unit that cools the reflector when the discharge lamp is turned off. The projector according to claim 1, wherein the predetermined portion is an end portion on an upper side in a vertical direction of the light emitting portion. A control method of a projector comprising a discharge lamp having a pair of electrodes and emitting light, and a cooling unit for blowing air to the discharge lamp and cooling the discharge lamp,
The discharge lamp has a light emitting part including a discharge space inside,
The pair of electrodes are disposed in the discharge space so as to face each other in the first direction,
When the discharge lamp is in a steady lighting state, the air blowing direction of the cooling unit is a first air blowing direction for blowing air toward a predetermined part of the light emitting unit,
When the discharge lamp is extinguished, a second air blowing direction in which the air blowing direction of the cooling unit is blown toward one of the end portions in the first direction of the light emitting unit different from the predetermined portion. A projector control method characterized by the above.

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