JP2015191784A - Light source device, projector and cooling method of discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device capable of suppressing condensation of mercury to an electrode.SOLUTION: A light source device includes: a discharge lamp for emitting light; a discharge lamp drive part for supplying drive power to the discharge lamp; a cooling part for cooling the discharge lamp; and a control part for controlling the cooling part. The discharge lamp drive part supplies drive power to the discharge lamp so that a first drive period PH1 in which first drive power is supplied to the discharge lamp, a second drive period PH3 in which second drive power which is smaller than the first drive power is supplied to the discharge lamp and a shift period PH2 in which the first drive period is shifted to the second drive period are provided. The control part can execute first output drive for driving the cooling part with first output proportional to the drive power, and second output drive for driving the cooling part with second output larger than the first output with respect to the drive power, and at least in one part of the first drive period and at least in one part of the second drive period, the first output drive is executed, and at east in one part of the shift period, the second output drive is executed.

Description

  The present invention relates to a light source device, a projector, and a discharge lamp cooling method.

For the purpose of extending the life of the light source, a projector that reduces power in a temporary standby state such as a standby state during normal use or a hibernation state has been proposed (for example, Patent Document 1).

JP 2007-41617 A

By the way, when the projector is turned off, the temperature in the discharge lamp decreases, so the mercury enclosed in the discharge lamp may condense and adhere to the inner wall or electrode of the discharge lamp. When the electrodes are connected by mercury adhering to the electrodes (mercury bridge), there is a case where the electrodes are short-circuited and the discharge lamp cannot be turned on.

In particular, when the discharge lamp is driven with relatively low power, the temperature of the electrode is relatively low with respect to the temperature of the inner wall of the discharge lamp. Temperature tends to drop to the same extent. Therefore, there is a problem that mercury tends to condense on both the electrode and the inner wall, and a mercury bridge is likely to occur.

One aspect of the present invention has been made in view of the above problems, and is a light source device capable of suppressing mercury condensation on an electrode, a projector using such a light source device, and a cooling method for a discharge lamp. Is one of the purposes.

One aspect of the light source device of the present invention controls a discharge lamp that emits light, a discharge lamp driving unit that supplies driving power to the discharge lamp, a cooling unit that cools the discharge lamp, and the cooling unit. A control unit, wherein the discharge lamp drive unit supplies a first drive period during which the first drive power is supplied to the discharge lamp, and a second drive power that is smaller than the first drive power is supplied to the discharge lamp. The driving power is supplied to the discharge lamp so as to be provided with a second driving period, and a transition period in which the first driving period shifts to the second driving period. A first output drive for driving the cooling unit with a first output proportional to electric power; and a second output drive for driving the cooling unit with a second output larger than the first output with respect to the driving power. At least part of the first drive period and the second drive In at least some period of time, running the first output drive, at least a part of the transition period, and executes the second output drive.

According to one aspect of the light source device of the present invention, the second output drive in which the cooling unit is driven with the second output larger than the first output proportional to the drive power is executed in at least a part of the transition period. Therefore, the temperature of the discharge lamp can be lowered during the transition period. Thereby, since the amount of mercury condensed on the inner wall of the discharge lamp increases during the transition period, it is possible to suppress mercury from condensing and adhering to the electrode when the discharge lamp is turned off.

One aspect of the light source device of the present invention includes a discharge lamp that emits light, a discharge lamp driving unit that supplies driving power to the discharge lamp, a cooling unit that cools the discharge lamp, the discharge lamp driving unit, A control unit that controls the cooling unit, wherein the discharge lamp driving unit has a first driving period during which the first driving power is supplied to the discharge lamp, and is smaller than the first driving power to the discharge lamp. Controlling the discharge lamp driving unit so as to provide a second driving period in which second driving power is supplied and a transition period in which the first driving period shifts to the second driving period, and the control unit Is a first output drive for driving the cooling unit with a first output proportional to the drive power, and a second output for driving the cooling unit with a second output greater than the first output with respect to the drive power. Driving, and at least a part of the first driving period The first output drive is executed in at least a part of the second drive period, and whether or not the second output drive is executed is determined in at least a part of the transition period based on the second drive power. It is characterized by doing.

According to one aspect of the light source device of the present invention, it is determined whether or not the second output drive is performed in the transition period based on the second drive power. Therefore, it is possible to execute the second output drive when the second drive power is relatively low, and mercury is condensed and attached to the electrode when the discharge lamp is turned off in the same manner as described above. Can be suppressed.

The second output may be configured to be equal to the first output for driving the cooling unit in the first driving period.
According to this structure, since the output which drives a cooling part can be made the same output as a 1st drive period, control is simple.

The second output may be configured to be larger than the first output that drives the cooling unit in the first drive period.
According to this configuration, since the discharge lamp can be further cooled during the transition period, it is possible to further suppress mercury from condensing and adhering to the electrode when the discharge lamp is turned off.

The second output may be configured to be set based on the second drive power.
According to this configuration, since the second output is set based on the second driving power, it is possible to cool the discharge lamp more appropriately and to suppress the condensation and adhesion of mercury on the electrode.

The second output may be set based on an ambient temperature.
According to this configuration, for example, when the ambient temperature is relatively low and the discharge lamp is easily cooled, blackening can be suppressed by setting the second output value low.

The second output drive may be configured to be executed over the transition period and the second drive period.
According to this configuration, the discharge lamp can be further cooled, and mercury can be further prevented from condensing and adhering to the electrode.

The execution time of the second output drive may be set based on the second drive power.
According to this configuration, the execution time of the second output drive can be set appropriately.

The discharge lamp includes a discharge lamp main body in which mercury is enclosed, and the control unit is configured to perform the first output drive when the discharge lamp temperature of the discharge lamp main body is executed in the second drive period. The second output drive may be performed so as to be lower than the maintained discharge lamp temperature.
According to this configuration, mercury can be further condensed.

The discharge lamp includes a discharge lamp main body in which mercury is enclosed, and the control unit executes the second output drive so that a discharge lamp temperature of the discharge lamp main body is equal to or lower than a condensation temperature of the mercury. It is good also as composition to do.
According to this configuration, mercury can be further condensed.

The control unit may supply a third driving power smaller than the second driving power to the discharge lamp during at least a part of the transition period.
According to this configuration, the temperature of the discharge lamp can be further reduced during the transition period.

One aspect of the projector according to the present invention includes the light source device described above, a light modulation element that modulates light emitted from the light source device according to a video signal, and a projection that projects light modulated by the light modulation element. And an optical system.

According to one aspect of the projector of the present invention, since the light source device described above is provided,
A projector is obtained in which mercury is prevented from condensing and adhering to the electrode of the discharge lamp.

One aspect of a cooling method for a discharge lamp according to the present invention includes a discharge lamp that emits light, a discharge lamp driving unit that supplies driving power to the discharge lamp, and a cooling unit that cools the discharge lamp. A method for cooling an electric lamp, wherein a first driving period in which a first driving power is supplied to the discharge lamp and a second driving period in which a second driving power smaller than the first driving power is supplied to the discharge lamp. And a transition period for transitioning from the first drive period to the second drive period, and the drive power in at least a part of the first drive period and at least a part of the second drive period First proportional to
The cooling unit is driven by an output, and the cooling unit is driven by a second output larger than the first output with respect to the driving power in at least a part of the transition period.

According to one aspect of the cooling method of the discharge lamp of the present invention, mercury can be prevented from condensing and adhering to the electrode in the same manner as described above.

One aspect of a cooling method for a discharge lamp according to the present invention includes a discharge lamp that emits light, a discharge lamp driving unit that supplies driving power to the discharge lamp, and a cooling unit that cools the discharge lamp. A method for cooling an electric lamp, wherein a first driving period in which a first driving power is supplied to the discharge lamp and a second driving period in which a second driving power smaller than the first driving power is supplied to the discharge lamp. And a transition period for transitioning from the first drive period to the second drive period, and the drive power in at least a part of the first drive period and at least a part of the second drive period First proportional to
Driving the cooling unit with an output, and driving the cooling unit with a second output that is greater than the first output with respect to the drive power based on the second drive power and at least part of the transition period. It is characterized by determining the presence or absence.

According to one aspect of the cooling method of the discharge lamp of the present invention, mercury can be prevented from condensing and adhering to the electrode in the same manner as described above.

It is a schematic block diagram of the projector of 1st Embodiment. It is sectional drawing of the discharge lamp of 1st Embodiment. It is a partial expanded sectional view of the discharge lamp of 1st Embodiment. It is a graph which shows the control method of the projector by the control unit in 1st Embodiment. It is a graph which shows another example of the waveform of the fan voltage in 1st Embodiment. It is a graph which shows another example of the waveform of the fan voltage in 1st Embodiment. It is a graph which shows another example of the waveform of the drive electric power in 1st Embodiment. It is a graph which shows the control method of the projector by the control unit in 2nd Embodiment. It is a graph which shows another example of the waveform of the fan voltage in 2nd Embodiment. It is a graph which shows the control method of the projector by the control unit in 3rd Embodiment. It is a graph which shows the relationship between the drive power of the low power period in 4th Embodiment, and the execution time of high output mode. It is a graph which shows another example of the waveform of the fan voltage in 4th Embodiment. It is a figure which shows a mode that mercury condensed inside the discharge lamp.

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.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a projector 1A according to the present embodiment.
As shown in FIG. 1, the projector 1A according to the present embodiment modulates a light beam emitted from a light source provided therein to form image light according to image information, and the image light is applied to a screen or the like. The projected image is enlarged and projected. The projector 1 </ b> A includes an exterior housing 2 that forms an exterior, and an apparatus main body 3 that is accommodated in the exterior housing 2.

The exterior housing 2 includes a top surface (not shown), a front surface 2B, a back surface 2C, a left side surface 2D, a right side surface 2E, and a bottom surface (not shown), and has a substantially rectangular shape in plan view. It is a formed box-shaped body. A plurality of legs (not shown) are provided on the bottom surface of the exterior housing 2.

The projector 1A is placed in a normal position by placing the legs in contact with the installation surface, and is suspended from the ceiling by being mounted with its bottom faced to the ceiling or the like upside down from the normal position. Become posture.

The apparatus main body 3 includes an optical control device 200a, a first cooling device CU1, an optical unit 4,
Is provided. Although not shown, the apparatus main body 3 includes a power supply apparatus that supplies driving power to each component of the projector 1A.

The optical control device 200a controls the first cooling device CU1 and the optical unit 4.
The first cooling device CU1 includes a fan F1 and a fan F2, introduces cooling air that is a cooling fluid from the outside of the exterior housing 2, and blows the cooling air to the optical unit 4, the optical control device 200a, and the power supply device. To cool each of these devices. The fans F1 and F2 are arranged so as to sandwich the projection optical device 45. The fans F1 and F2 are sirocco fans, introduce external cooling air from an air inlet (not shown) formed in the exterior housing 2, and blow the cooling air to an electro-optical device 44 described later.

The optical unit 4 forms image light according to image information under the control of the optical control device 200a, and projects the image light onto a screen or the like. The optical unit 4 includes a light source device 5, an illumination optical device 41, a color separation optical device 42, a relay optical device 43, an electro-optical device 44, a projection optical device (projection optical system) 45, and an optical component housing. And a body 46.
The optical component housing 46 accommodates each device of the optical unit 4 at a predetermined position on the illumination optical axis A set inside, and supports the projection optical device 45.

The light source device 5 emits a light beam. The light source device 5 includes a second cooling device (cooling unit) CU2, a light source unit 50, a collimating concave lens 56, a housing 57, and a fan control device (control unit) 200b.

The second cooling device CU2 includes a fan F3 and a fan F4.
The fans F3 and F4 are disposed in the vicinity of the light source unit 50. Projector 1A
The fan F3 located on the rear surface 2C side is formed of a sirocco fan, sucks the cooling air in the exterior housing 2 and blows it to the light source unit 50.

The fan F4 located on the front surface 2B side of the projector 1A is an axial fan. The fan F4 sucks air that has cooled the light source unit 50, discharges the air toward the front surface 2B of the projector 1A, and discharges the air through the exhaust port 2B1 of the front surface 2B.
Drain outside.
The fan F3 may be an axial fan, and the fan F4 may be a sirocco fan. Further, the exhaust port 2B1 may be formed on any surface of the exterior housing 2.

FIG. 2 is a cross-sectional view showing the configuration of the light source unit 50. As shown in FIG. 2, the light source unit 50 includes a main reflecting mirror 55, a discharge lamp 90, a sub-reflecting mirror 52, and a discharge lamp lighting device (discharge lamp driving unit) 10.
The main reflecting mirror 55 reflects the light emitted from the discharge lamp 90 in the irradiation direction D. The irradiation direction D is parallel to the illumination optical axis A of the discharge lamp 90.

The shape of the discharge lamp 90 is a rod shape extending along the irradiation direction D. One end of the discharge lamp 90 is a first end 90e1, and the other end of the discharge lamp 90 is a second end 90e2. Discharge lamp 9
The material of 0 is, for example, a translucent material such as quartz glass. The central portion of the discharge lamp 90 swells in a spherical shape, and the inside is a discharge space 91. The discharge space 91 is filled with a gas that is a discharge medium containing a rare gas, a metal halide, or the like.

In the discharge space 91, the tips of the first electrode 92 and the second electrode 93 protrude. First electrode 9
2 is disposed on the first end 90 e 1 side of the discharge space 91. The second electrode 93 is disposed on the second end 90 e 2 side of the discharge space 91. The shapes of the first electrode 92 and the second electrode 93 are:
It is a rod shape extending along the illumination optical axis A. The discharge space 91 includes a first electrode 92 and a second electrode 9.
The three electrode tips are arranged so as 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.

A first terminal 536 is provided at the first end 90 e 1 of the discharge lamp 90. First terminal 536
And the first electrode 92 are electrically connected by a conductive member 534 penetrating the inside of the discharge lamp 90. Similarly, a second terminal 546 is provided at the second end 90e2 of the discharge lamp 90. The second terminal 546 and the second electrode 93 are electrically conductive members 544 that penetrate the interior of the discharge lamp 90.
Are electrically connected. 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 a drive current for driving the discharge lamp 90 to the first terminal 536 and the second terminal 546. In other words, the discharge lamp lighting device 10 applies driving power between the first electrode 92 and the second electrode 93 of the discharge lamp 90. 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. The discharge lamp lighting device 10 is controlled by the optical control device 200a.

FIG. 3 is an enlarged cross-sectional view showing the discharge lamp 90.
As shown in FIG. 3, the first electrode 92 includes a core rod 612, a coil portion 614, and a main body portion 616.
And a protrusion 618. The first electrode 92 forms a coil portion 614 by winding a wire rod of an electrode material (tungsten or the like) around a core rod 612 in a stage before being enclosed in the discharge lamp main body 510, and the formed coil portion 614 is heated and melted. It is formed by doing. As a result, a main body 616 having a large heat capacity and a projection 618 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 712, a coil portion 714, a main body portion 716, a protrusion 718,
It has. The second electrode 93 is formed in the same manner as the first electrode 92.

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. More specifically, since the arc AR and the vicinity thereof are extremely hot, convection AF (indicated by a one-dot chain line arrow in FIG. 3) is formed in the discharge space 91 that flows upward in the vertical direction from the arc AR. As shown in FIG. 3, the convection AF hits the inner wall of the discharge lamp main body 510 and moves along the inner wall of the discharge lamp main body 510, and passes through the core rods 612, 712 and the like of the first electrode 92 and the second electrode 93. It descends while being cooled.
The descending convection AF further descends along the inner wall of the discharge lamp main body 510, but rises so as to collide with each other on the lower side in the vertical direction of the arc AR and return to the upper arc AR.

When the convection AF moves along the inner wall of the discharge lamp main body 510, the discharge lamp main body 51
0 is heated. Here, the convection AF 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 top 510a of the discharge lamp main body 510 that is in contact with the convection AF on the upper side in the vertical direction of the arc AR is the discharge lamp main body 51.
0 (the discharge lamp 90) is the hottest part at the highest temperature. Further, the bottom 510b of the discharge lamp main body 510 that is in contact with the convection AF on the lower side in the vertical direction of the arc AR is the discharge lamp main body 510 (
In the discharge lamp 90), it becomes the coldest part which is the lowest temperature.

As shown in FIG. 2, the main reflecting mirror 55 is fixed to the first end 9 of the discharge lamp 90 by the fixing member 114.
It is fixed at 0e1. The main reflecting mirror 55 reflects the light traveling toward the opposite side to the irradiation direction D in the discharge light toward the irradiation direction D. Reflective surface of the main reflector 55 (surface on the discharge lamp 90 side)
The shape of is not particularly limited as long as the discharge light can be reflected in the irradiation direction D,
For example, it may be a spheroidal shape or a rotating parabolic shape. For example, the main reflector 5
When the shape of the reflecting surface 5 is a parabolic parabola shape, the main reflecting mirror 55 can convert the discharge light into light substantially parallel to the illumination optical axis A. Thereby, the collimating concave lens 56 can be omitted.

The sub-reflecting mirror 52 is fixed to the second end 90 e 2 side of the discharge lamp 90 by a fixing member 522. The shape of the reflection surface (surface on the discharge lamp 90 side) of the sub-reflecting mirror 52 is a spherical shape that surrounds the portion of the discharge space 91 on the second end 90e2 side. The sub-reflecting mirror 52 is the main reflecting mirror 55 of the discharge light.
The light traveling toward the side opposite to the side where the is disposed is reflected toward the main reflecting mirror 55. Thereby, the utilization efficiency of the light radiated | emitted from the discharge space 91 can be improved.

The material of the fixing members 114 and 522 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. The method of fixing the arrangement of the main reflecting mirror 55 and the sub reflecting mirror 52 and the discharge lamp 90 is not limited to the method of fixing the main reflecting mirror 55 and the sub reflecting mirror 52 to the discharge lamp 90, and any method can be adopted. . For example, the discharge lamp 90 and the main reflecting mirror 55 may be fixed to the housing 57 independently. The same applies to the sub-reflecting mirror 52.

As shown in FIG. 1, the housing 57 houses the light source unit 50 and the collimating concave lens 56.
The collimating concave lens 56 collimates the light beam converged by the main reflecting mirror 55 with respect to the illumination optical axis A.

The fan control device 200b controls the second cooling device CU2, that is, the fans F3 and F4. In the present embodiment, a method of controlling the cooling state of the discharge lamp 90 by mainly controlling the fan F3 in the second cooling device CU2 will be described. In the present embodiment, as a method of controlling the fan F3, a method of changing the number of rotations of the fan F3 (flow rate of cooling air) by controlling the fan voltage Vf applied to drive the fan F3. Is used. According to this method, since the fan voltage Vf is substantially proportional to the rotational speed of the fan F3, it is easy to control the rotational speed of the fan F3.
The fan control device 200b has a steady output mode (first output drive) and a high output mode (second output).
Output drive). Details will be described later.

In the present embodiment, the optical control device 200a and the fan control device 200b constitute a control unit 200.

The illumination optical device 41 includes a pair of lens arrays 411 and 412, a polarization conversion element 413,
A superimposing lens 414.
The color separation optical device 42 includes dichroic mirrors 421 and 422 and a reflection mirror 423.
The relay optical device 43 includes an incident side lens 431, a relay lens 433, and a reflection mirror 4.
32, 434.

The electro-optical device 44 includes a field lens 441, a liquid crystal panel (light modulation element) 442 as a light modulation device, an incident-side polarizing plate 443, a viewing angle compensation plate 444, and an emission-side polarizing plate 44.
5 and a cross dichroic prism 446 as a color synthesizing optical device.
The liquid crystal panel 442 includes a liquid crystal panel 442R for red light and a liquid crystal panel 442 for green light.
G and a liquid crystal panel 442B for blue light. The field lens 441, the incident side polarizing plate 443, the viewing angle compensation plate 444, and the emission side polarizing plate 445 are liquid crystal panels 442R, 44.
It is provided for each of 2G and 442B.

The projection optical device 45 enlarges and projects the light beam modulated by the electro-optical device 44. Although not shown, the projection optical device 45 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical barrel.

The luminous flux emitted from the light source device 5 is substantially uniform in illuminance in the illumination area by the illumination optical device 41, and the luminous flux is red (R), green (G), blue (B) by the color separation optical device 42. ) Are separated into three color lights. Each separated color light is modulated by each liquid crystal panel 442 according to image information. The modulated color lights are combined by a cross dichroic prism 446 and enlarged and projected on a projection surface (for example, a screen) by a projection optical device 45.

Next, the control method by the control unit 200 of this embodiment is demonstrated.
4A to 4C show the control unit 200 of the present embodiment when the drive power W supplied to the discharge lamp 90 is changed from a relatively high drive power to a relatively low drive power.
It is a graph shown about the control method of the projector 1A by. FIG. 4A is a graph showing a waveform of the driving power W of the present embodiment. FIG. 4B shows the fan voltage V of this embodiment.
It is a graph which shows the waveform of f. FIG. 4C is a graph showing changes in the discharge lamp temperature T of the present embodiment. In FIG. 4A, the vertical axis indicates the drive power W. In FIG. 4B, the vertical axis indicates the fan voltage Vf. In FIG. 4C, the vertical axis indicates the discharge lamp temperature T. 4A to 4C, the horizontal axis indicates time.

In this embodiment, as shown in FIG. 4A, the optical control device 200a of the control unit 200 includes a steady lighting period (first driving period) PH1, a transition period PH2, and a low power period (second power period).
The discharge lamp lighting device 10 is controlled so that a driving period PH3 is provided. In other words, the discharge lamp lighting device 10 includes the steady lighting period PH1, the transition period PH2, and the low power period PH.
3, the driving power W is supplied to the discharge lamp 90.

The steady lighting period PH1 is a period during which the steady lighting mode is executed. The steady lighting mode is
This is a lighting mode in which steady lighting power (first driving power) Ws is supplied to the discharge lamp 90. In the steady lighting period PH1, the driving power W is kept constant at the steady lighting power Ws.

The low power period PH3 is, for example, a period in which the standby mode is executed in the present embodiment. The standby mode is a lighting mode in which standby power (second driving power) Wp is supplied to the discharge lamp 90. The standby mode is executed, for example, when no video signal is input to the projector 1A for a certain time. In the low power period PH3, the driving power W is kept constant at the standby power Wp.

The transition period PH2 is a period during which the steady lighting period PH1 transitions to the low power period PH3. In the present embodiment, the transition period PH2 is provided from time ts to time te.
In the example shown in FIG. 4A, the driving power W linearly changes from the steady lighting power Ws to the standby power Wp in the transition period PH2.

As an example, the steady lighting power Ws in the steady lighting period PH1 is 280 W, and the standby power Wp in the low power period PH3 is 70 W. For example, the transition period P
In H2, the drive power W is set to decrease at 8 W / s.

In the present embodiment, the fan control device 200b of the control unit 200 applies a fan voltage Vf to the fan F3 as shown in FIG. 4B. As described above, the fan control device 200b can execute the steady output mode (first output drive) and the high output mode (second output drive).

In the steady output mode, a fan F3 in which a steady fan voltage (first output) is applied to the fan F3.
Is the output mode. The steady fan voltage is a fan voltage Vf set to maintain the discharge lamp temperature T at an appropriate temperature, and is set to be proportional to the drive power W. That is, when the steady output mode is executed, the waveform of the driving power W and the waveform of the fan voltage Vf have similar shapes.

In this specification, the fan voltage Vf is proportional to the drive power W.
It does not mean only when f is strictly proportional to the driving power W, and for example, an error of about 0.9 times or more and 1.1 times or less is allowed.

The high output mode is an output mode of the fan F3 in which a fan voltage (second output) larger than the steady fan voltage (first output) with respect to the driving power W is applied to the fan F3. That is,
In the present embodiment, the second output is a fan voltage that lowers the discharge lamp temperature T below an appropriate temperature when the discharge lamp 90 is driven with the driving power W.

In the present embodiment, the steady output mode is executed in the steady lighting period PH1 and the low power period PH3. That is, in steady output mode, steady lighting power (first driving power)
The steady fan voltage in the steady lighting period PH1 in which Ws is supplied to the discharge lamp 90 is Vfs, and the low power period PH3 in which standby power (second drive power) Wp is supplied to the discharge lamp 90.
The stationary fan voltage at is Vfp.

In the present embodiment, the steady output mode is not executed over the entire transition period PH2, but if it is executed, the fan voltage Vf in the transition period PH2 is as shown in FIG.
As shown by a two-dot chain line in), it changes linearly according to the linear change of the driving power W in the transition period PH2.

In the present embodiment, the high output mode is executed during the entire transition period PH2. The fan voltage Vf (second output) in the high output mode is a steady fan in the steady lighting period PH1 as a fan voltage larger than the steady fan voltage (first output) in the steady output mode indicated by the two-dot chain line in the transition period PH2. The voltage Vfs is applied to the fan F3. In other words, the fan voltage Vf in the transition period PH2 in the present embodiment is equal to the steady lighting period PH1.
Is equal to the steady state fan voltage Vfs. In the present embodiment, the fan voltage Vf applied to the fan F3 during the transition period PH2 is constant.

When the fan F3 is controlled by the fan control device 200b as described above, the discharge lamp temperature T changes as shown in FIG.
Here, the “discharge lamp temperature” in this specification means the temperature of the discharge lamp main body 510, and may be the temperature of at least a part of the discharge lamp main body 510, or the discharge lamp main body 51.
It may be a part of zero or the average temperature of the whole. In the present embodiment, the discharge lamp temperature T is, for example, the average temperature of the inner wall of the discharge lamp main body 510.

In the present embodiment, the fan voltage Vf is controlled according to the driving power W so that the discharge lamp temperature T is constant. That is, in the steady lighting period PH1 in which the driving power W becomes the steady lighting power Ws, the fan voltage Vf is controlled so that the discharge lamp temperature T becomes the steady temperature Ts, and the driving power W becomes the standby power Wp. In the period PH3, the fan voltage Vf is controlled so that the discharge lamp temperature T becomes the standby temperature Tp. The steady temperature Ts is the discharge lamp temperature T that is maintained when the steady output mode is executed in the steady lighting period PH1.
The standby temperature Tp is the discharge lamp temperature T (appropriate temperature) held when the steady output mode is executed in the low power period PH3.

When the transition from the steady lighting period PH1 to the transition period PH2, the discharge lamp temperature T rapidly decreases, and at the time te when the transition period PH2 transitions to the low power period PH3, the temperature Tc1 is lower than the standby temperature Tp. In the low power period PH3, the discharge lamp temperature T rises toward the standby temperature Tp and is kept constant after reaching the standby temperature Tp.

In this embodiment, the temperature Tc1 is equal to or lower than the condensation temperature of mercury. The mercury condensation temperature is a temperature at which mercury begins to condense, and is a temperature determined according to the amount of mercury enclosed in the discharge lamp main body 510, pressure, and physical properties. The condensation temperature of mercury is, for example, about 650 ° C.

In the case where the high output mode is not executed over the entire transition period PH2, that is, FIG.
As shown by the two-dot chain line in (B), when the steady output mode is executed in the transition period PH2, the discharge lamp temperature T in the transition period PH2 is as shown by the two-dot chain line shown in FIG. Change. That is, the discharge lamp temperature T is changed from the steady temperature Ts to the standby temperature Tp.
Decline towards At this time, the time te at which the transition period PH2 transitions to the low power period PH3
In this case, the discharge lamp temperature T may not decrease to the standby temperature Tp. In this case, the discharge lamp temperature T becomes the standby temperature Tp at a certain point in the low power period PH3.

According to this embodiment, since the high output mode is executed in the transition period PH2, the first
Mercury is prevented from condensing and adhering to the electrode 92 and the second electrode 93. Details will be described below.

In a low power mode such as a standby mode in which relatively low power is supplied to the discharge lamp 90, the temperature of the inner wall of the discharge lamp body 510 relative to the temperature of the first electrode 92 and the second electrode 93 (
The discharge lamp temperature T) is relatively lower than in the steady lighting mode. Therefore, when the projector 1A is turned off from the standby mode, the temperature of the first electrode 92 and the second electrode 93 and the temperature of the inner wall of the discharge lamp main body 510 are reduced to the same extent and enclosed in the discharge lamp main body 510. In some cases, the mercury was condensed and adhered to the first electrode 92 and the second electrode 93 and the inner wall.

FIG. 13 is a diagram showing a state in which condensed mercury Hg adheres to the inner wall of the discharge lamp main body 510, the first electrode 92, and the second electrode 93 after the projector 1A is turned off. FIG.
, Mercury Hg adhering to the first electrode 92 and the second electrode 93 connects the first electrode 92 and the second electrode 93. That is, a so-called mercury bridge is generated. In such a state, there is a problem that the first electrode 92 and the second electrode 93 are short-circuited and the discharge lamp 90 cannot be lit.

With respect to this problem, according to the present embodiment, the high output mode is executed in the transition period PH2. Thereby, since the discharge lamp temperature T falls to the temperature Tc1 during the transition period PH2, mercury Hg is likely to condense and adhere to the inner wall of the discharge lamp main body 510. As a result, the amount of mercury Hg condensed on the inner wall of the discharge lamp main body 510 during lighting increases, while the amount of mercury Hg condensed after the projector 1A is turned off decreases. Therefore, according to the present embodiment, it is possible to prevent mercury Hg from adhering to the first electrode 92 and the second electrode 93 after the projector 1A is turned off.

Further, when the standby mode is executed for a long time, since the discharge lamp temperature T is maintained at a relatively low standby temperature Tp for a long time, the mercury Hg that condenses and adheres to the inner wall of the discharge lamp main body 510. The amount increases. Thereby, after the projector 1 </ b> A is turned off, it is somewhat suppressed that mercury Hg adheres to the first electrode 92 and the second electrode 93.

However, when the projector 1A is turned off immediately after shifting to the standby mode, the amount of mercury Hg adhering to the inner wall of the discharge lamp main body 510 is small in the standby mode. The risk of mercury Hg condensing and adhering to the second electrode 93 increases.

For example, as shown by a two-dot chain line in FIG. 4C, when the projector 1A is turned off before the discharge lamp temperature T falls to the standby temperature Tp, the first electrode 9 is turned off.
2 and the temperature of the inner wall of the discharge lamp main body 510 with respect to the temperature of the second electrode 93 (discharge lamp temperature T),
Since it becomes relatively lower, the first electrode 92 and the second electrode 9 than the inner wall of the discharge lamp main body 510.
There was a possibility that mercury Hg was likely to adhere to No. 3.

With respect to this problem, according to the present embodiment, since the discharge lamp temperature T decreases to the temperature Tc1 in the transition period PH2, the projector 1A is turned off immediately after the transition to the standby mode, that is, the low power period PH3. Even so, it is possible to prevent the mercury Hg from condensing and adhering to the first electrode 92 and the second electrode 93.

Further, immediately after the transition to the standby mode, as shown in FIG. 4C, since the discharge lamp temperature T is lower than the standby temperature Tp, after the projector 1A is turned off,
The temperature of the inner wall of the discharge lamp main body 510 is likely to be lower than the temperatures of the first electrode 92 and the second electrode 93, and it is possible to further suppress the condensation of mercury Hg on the first electrode 92 and the second electrode 93.

Further, for example, after the turn-off command is input to the projector 1A, the mercury Hg is condensed after the turn-off of the projector 1A by adjusting the driving power W or the like.
A method for suppressing the adhesion to the electrode 93 is also conceivable.
However, for example, when the projector 1A is turned off by a method that is not based on a normal means such as directly shutting off an external power supply that supplies power to the projector 1A, the above method cannot be employed.

On the other hand, according to the present embodiment, the condensation of mercury Hg can be promoted in the transition period PH2, so the first after the projector 1A is turned off regardless of the method for turning off the projector 1A.
It can suppress that mercury Hg condenses and adheres to the electrode 92 and the second electrode 93.

In addition, as a case where the external power supply for supplying power to the projector 1A is directly cut off,
For example, when it is difficult to press the power button of the projector directly like a ceiling-suspended projector, the projector may be turned off by turning off a power switch installed on a wall or the like. That is, according to the present embodiment, even when the projector 1A of the present embodiment is applied to a ceiling-mounted projector and a light-off method that directly shuts off the external power supply is employed, the first electrode 92 and the first electrode 92 It can suppress that mercury Hg condenses and adheres to the two electrodes 93.

Further, as a countermeasure for the case where the direct power supply is cut off as described above, by providing a capacitor or the like, the fan F3 is rotated even after the power supply is cut off, and the discharge lamp 9
A method of cooling 0 is also conceivable, but this case is not preferable because the cost increases.

Further, according to the present embodiment, the temperature Tc1 that decreases in the transition period PH2 becomes lower than the discharge lamp temperature T that is maintained when the steady output mode is executed in the low power period PH3, that is, the standby temperature Tp. The high output mode is executed as follows. Therefore, according to the present embodiment, mercury is likely to condense in the transition period PH2, and as a result, the mercury Hg is prevented from condensing and adhering to the first electrode 92 and the second electrode 93 after the projector 1A is turned off. it can.

Further, according to the present embodiment, the fan voltage Vf is controlled such that the temperature Tc1 that decreases during the transition period PH2 is equal to or lower than the condensation temperature of mercury Hg. Therefore, according to this embodiment, mercury Hg is more easily condensed in the transition period PH2, and as a result, the projector 1
It is possible to further prevent mercury Hg from condensing and adhering to the first electrode 92 and the second electrode 93 after A is turned off.

In addition, when the discharge lamp temperature T falls, the brightness | luminance of the image | video projected by the projector 1A may fall. Therefore, for example, when the driving power W in the low power period PH3 is relatively high, it may be preferable not to lower the discharge lamp temperature T in the transition period PH2 to the condensation temperature of mercury Hg.
On the other hand, when the low power period PH3 is a standby mode in which no video signal is input as in the present embodiment, the discharge lamp temperature T may be decreased to a temperature lower than the condensation temperature of mercury Hg in the transition period PH2. preferable.

Further, according to the present embodiment, since the fan voltage Vf in the high output mode in the transition period PH2 is equal to the steady fan voltage Vfs in the steady output mode in the steady lighting period PH1, the steady lighting period PH1 and the transition period PH2 Since the fan voltage Vf can be constant, the control is simple.

  In the present embodiment, the following configuration may be employed.

In the above description, the fan voltage Vf in the transition period PH2 is the steady lighting period PH1.
Although an example in which the steady fan voltage Vfs is set to has been shown, the present invention is not limited to this. In the present embodiment, the fan voltage Vf in the transition period PH2 is particularly limited within a range that is set higher than the steady fan voltage in the steady output mode in the transition period PH2 (see the two-dot chain line in FIG. 4B). For example, it may be set as shown in FIGS. 5 and 6.

5 and 6 are graphs showing other examples of the waveform of the fan voltage Vf in the present embodiment.
In the present embodiment, as shown in FIG. 5, during the transition period PH2, the fan voltage Vf
May be set to a fan voltage Vfc1 larger than the steady fan voltage Vfs in the steady output mode in the steady lighting period PH1.

According to this configuration, since the discharge lamp temperature T further decreases during the transition period PH2, the amount of mercury Hg condensed and attached to the inner wall of the discharge lamp main body 510 increases during the transition period PH2. As a result, according to this configuration, it is possible to prevent mercury Hg from adhering to the first electrode 92 and the second electrode 93 after the projector 1A is turned off.

In the present embodiment, as shown in FIG. 6, the fan voltage Vf may be set to change linearly during the transition period PH2. In the example shown in FIG. 6, in the transition period PH2, the fan voltage Vf changes linearly from the steady fan voltage Vfs in the steady output mode in the steady lighting period PH1 to the fan voltage Vfc2. The fan voltage Vfc2 is smaller than the steady fan voltage Vfs in the steady lighting period PH1 and larger than the steady fan voltage Vfp in the steady output mode in the low power period PH3. Therefore, the fan voltage Vf in the transition period PH2 is set to be larger than the steady fan voltage in the steady output mode indicated by the two-dot chain line throughout the transition period PH2.

According to this configuration, it is easy to adjust the cooling state of the discharge lamp 90 in the transition period PH2.
Further, according to this configuration, since the fan voltage Vf changes gradually, the noise of the fan F3 also changes gradually. Thereby, it is difficult for the user to recognize the change in the noise of the fan F3.

In the above description, the case where the drive power W changes linearly in the transition period PH2 is shown, but the present invention is not limited to this. In the present embodiment, as shown in FIG. 7, the driving power W may be changed stepwise in the transition period PH2. In the example illustrated in FIG. 7, the driving power W decreases from the steady lighting power Ws to the driving power Wc2 at the time ts when the transition period PH2 is reached, and is held until the time tw1. Then, the drive power W decreases from the drive power Wc2 to the drive power Wc1 at time tw1 and is held until time te, and then the time t
e decreases the standby power Wp.

In this configuration, the number of stages where the drive power W changes is not particularly limited, and any number of stages may be provided.

In the present embodiment, the driving power W is the steady lighting power W during the transition period PH2.
It may be configured to change rapidly from s to standby power Wp.

In the present embodiment, the value of the fan voltage Vf in the transition period PH2 may be set based on the driving power W (standby power Wp) in the low power period PH3. For example, the value of the fan voltage Vf in the transition period PH2 may be set larger as the driving power W in the low power period PH3 is smaller. As the driving power W in the low power period PH3 is smaller, mercury Hg is more likely to adhere to the first electrode 92 and the second electrode 93 when the projector 1A is turned off. Therefore, the value of the fan voltage Vf in the transition period PH2 is increased. By setting, mercury Hg can be more reliably prevented from adhering to the first electrode 92 and the second electrode 93 during the transition period PH2.

In the present embodiment, the transition period P is based on the difference between the steady lighting power Ws in the steady lighting period PH1 and the driving power W (standby power Wp) in the low power period PH3.
The value of the fan voltage Vf at H2 may be set. For example, as the difference between the steady lighting power Ws in the steady lighting period PH1 and the driving power W (standby power Wp) in the low power period PH3 is larger, the discharge lamp temperature T is less likely to decrease to the standby temperature Tp in the transition period PH2. For this reason, the value of the fan voltage Vf in the transition period PH2 is preferably set large.

Further, in this case, in order to suppress the discharge lamp temperature T from being excessively lowered, based on the difference between the steady lighting power Ws in the steady lighting period PH1 and the driving power W (standby power Wp) in the low power period PH3. The length of the period during which the fan F3 is driven with the set fan voltage Vf may be set as appropriate. That is, for example, in the first fixed period of the transition period PH2, the fan voltage Vf is set to the steady fan voltage Vfs in the steady output mode in the steady lighting period PH1, and in the subsequent period up to the low power period PH3, the fan voltage Vf is set. Voltage Vf
May be set to the fan voltage Vf set based on the difference between the steady lighting power Ws in the steady lighting period PH1 and the driving power W (standby power Wp) in the low power period PH3.

In the present embodiment, the value of the fan voltage Vf in the high output mode in the transition period PH2 may be set based on the ambient temperature of the projector 1A. For example, the higher the temperature around the projector 1A, the higher the temperature of the inner wall of the discharge lamp main body 510 (discharge lamp temperature T).
Therefore, it is preferable to increase the value of the fan voltage Vf in the transition period PH2.

Further, for example, the lower the temperature around the projector 1A, the lower the temperature of the inner wall of the discharge lamp main body 510. Therefore, the discharge lamp main body 510 is excessively cooled by the high output mode,
The halogen cycle is less likely to occur and blackening may occur, or the sealing portion of the discharge lamp main body 510 may be distorted. Therefore, the lower the temperature around the projector 1A, the lower the fan voltage Vf in the transition period PH2, that is, the fan voltage Vf in the high output mode.
The value of is preferably set small.

Here, blackening is a phenomenon in which the electrode material evaporated by the arc discharge adheres to the inner wall of the discharge lamp main body 510, and causes the life of the discharge lamp to be shortened. It is known that blackening can be suppressed by a halogen cycle.

In addition, the halogen cycle means that the electrode material is halogenated by reacting the molten and evaporated electrode material with the halogen gas enclosed in the discharge lamp, and the evaporated electrode material is again electroded by convection in the discharge lamp. It is a reaction cycle to return to. Since the melting point of the halogenated electrode material is lowered, solidification on the inner wall of the arc tube is suppressed, and as a result, blackening is suppressed. Halogen cycles are less likely to occur when the discharge lamp is excessively cooled.

In the above description, the high output mode is not executed in the steady lighting period PH1, but the present invention is not limited to this. In the present embodiment, the high output mode may be executed in a part of the steady lighting period PH1. For example, in the steady lighting period PH1, the high output mode is from the time when the command to shift to the low power period PH3 is input until the drive power W actually starts to change, that is, until the transition to the transition period PH2. May be executed. In this case, the high output mode is executed over the steady lighting period PH1 and the transition period PH2.

According to this configuration, for example, even when the transition period PH2 is short, that is, when the driving power W suddenly changes from the steady lighting power Ws to the standby power Wp in the transition period PH2, the low power period It is easy to appropriately lower the discharge lamp temperature T before shifting to PH3.

In the above description, the low power period PH3 is the period in which the standby mode is executed, but the present invention is not limited to this. The low power period PH3 is higher in driving power W than the steady lighting period PH1.
If it is in the small range, it will not specifically limit.

In the present embodiment, the discharge lamp temperature T is a part of the inner wall of the discharge lamp main body 510, for example,
It may be the temperature of the inner wall of the top portion 510a or the inner wall of the bottom portion 510b.

(Second Embodiment)
The second embodiment differs from the first embodiment in that a cooling period PH31 is provided in the low power period PH3.
In the following description, the same components as those in the above-described embodiment may be omitted by appropriately attaching the same reference numerals.

8A to 8C show the control unit 200 of this embodiment when the driving power W supplied to the discharge lamp 90 is changed from a relatively high driving power to a relatively low driving power.
It is a graph shown about the control method of the projector 1A by. FIG. 8A is a graph showing a waveform of the driving power W of the present embodiment. FIG. 8B shows the fan voltage V of this embodiment.
It is a graph which shows the waveform of f. FIG. 8C is a graph showing changes in the discharge lamp temperature T of the present embodiment. In FIG. 8A, the vertical axis indicates the drive power W. In FIG. 8B, the vertical axis indicates the fan voltage Vf. In FIG. 8C, the vertical axis indicates the discharge lamp temperature T. 8A to 8C, each horizontal axis represents time.

In the present embodiment, as shown in FIG. 8A, the optical control device 200a of the control unit 200 includes a steady lighting period PH1, a transition period PH2, and a low power period PH3, as in the first embodiment. The discharge lamp lighting device 10 is controlled so as to be provided.
The waveform of the drive power W of the present embodiment is the same as the waveform of the drive power W of the first embodiment shown in FIG.

As shown in FIG. 8B, the waveform of the fan voltage Vf in the present embodiment is provided with a cooling period PH31 in which the high output mode is executed in the low power period PH3 as compared with the first embodiment. Different in. That is, in the present embodiment, the high output mode is executed over the transition period PH2 and the low power period PH3. In the example of FIG. 8B, the cooling period P
H31 is a period from time te to time tc. Further, in the transition period PH2 and the cooling period PH31, the fan voltage Vf in the high output mode is maintained at a value equal to the steady fan voltage Vfs in the steady output mode in the steady lighting period PH1.

The length of the cooling period PH31 can be adjusted according to the lighting mode executed in the low power period PH3, for example. Specifically, for example, when the lighting mode executed in the low power period PH3 is a lighting mode for projecting an image, the length of the cooling period PH31 is preferably set to be short. This is because when the temperature of the discharge lamp 90 decreases, the luminance of the image projected by the projector 1A decreases.

As shown in FIG. 8C, the discharge lamp temperature T is changed from the time ts to the time te in FIG.
As in the first embodiment shown in FIG. In the present embodiment, since the high output mode is executed also in the cooling period PH31 from time te to time tc, the cooling period PH31
, The discharge lamp temperature T further decreases to a temperature Tc2. Then, after the high output mode ends, that is, after time tc, the discharge lamp temperature T rises and becomes the standby temperature Tp.

According to the present embodiment, since the cooling period PH31 in the high output mode is provided, the discharge lamp temperature T further decreases in the cooling period PH31, and the condensation of mercury Hg is further promoted. Therefore, according to the present embodiment, after the projector 1A is turned off,
It can suppress more that mercury Hg condenses and adheres to the 1st electrode 92 and the 2nd electrode 93.

In the present embodiment, as shown in FIG. 9, the fan voltage Vf in the high output mode may be configured to change linearly during the transition period PH2 and the cooling period PH31.
FIG. 9 is a graph showing another example of the waveform of the fan voltage Vf in the present embodiment. In FIG. 9, the steady fan voltage in the steady output mode in the transition period PH2 and the cooling period PH31 is indicated by a two-dot chain line.

In this configuration, as shown in FIG. 9, between the time ts and the time tc, the fan voltage Vf in the high output mode is changed from the steady fan voltage Vfs in the steady output mode in the steady lighting period PH1 to the low power period. Steady fan voltage Vf in steady output mode at PH3
Linearly changes to p.
According to this configuration, as described above, it is easy to adjust the cooling state of the discharge lamp 90, and it is difficult for the user to recognize the change in the noise of the fan F3.

(Third embodiment)
The third embodiment is different from the first embodiment in that a period in which the driving power W is set to a value lower than the standby power Wp in the transition period PH2 is provided.
In the following description, the same components as those in the above-described embodiment may be omitted by appropriately attaching the same reference numerals.

10A to 10C show the control unit 20 of the present embodiment when the driving power W supplied to the discharge lamp 90 is changed from a relatively high driving power to a relatively low driving power.
6 is a graph showing a control method of the projector 1A by zero. FIG. 10A is a graph showing a waveform of the driving power W of this embodiment. FIG. 10B is a graph showing a waveform of the fan voltage Vf of the present embodiment. FIG. 10C is a graph showing changes in the discharge lamp temperature T of the present embodiment. In FIG. 10A, the vertical axis indicates the driving power W. FIG.
In B), the vertical axis indicates the fan voltage Vf. In FIG. 10C, the vertical axis indicates the discharge lamp temperature T. 10A to 10C, the horizontal axis represents time (time).
).

In the present embodiment, as shown in FIG. 10A, the transition period PH2 includes a first transition period PH21, a second transition period PH22, and a third transition period PH23.
In the first transition period PH21, the drive power W is changed from the steady lighting power Ws to the standby power Wp.
This is a period during which the power (third drive power) Wm changes to a lower value. First transition period PH21
Are provided from time ts to time tw2. In the example of FIG. 10A, the drive power W changes linearly in the first transition period PH21.

The second transition period PH22 is a period during which the drive power W is held at the power Wm. The second transition period PH22 is provided from time tw2 to time tw3. If the state in which the electric power Wm smaller than the standby electric power Wp is supplied to the discharge lamp 90 is continued excessively, problems such as blackening and unstable discharge may occur. It is preferable to set the length within a range in which the discharge lamp main body 510 can be appropriately cooled.

The third transition period PH23 is a period during which the drive power W changes from the power Wm to the standby power Wp. The third transition period PH23 is provided from time tw3 to time te. In the example shown in FIG. 10A, the drive power W changes linearly in the third transition period PH23.

In the present embodiment, the fan voltage Vf is controlled as in the first embodiment, as shown in FIG.
In the present embodiment, as shown in FIG. 10C, the discharge lamp temperature T rapidly decreases during the transition period PH2, and changes from the steady temperature Ts to the temperature Tc3. And the discharge lamp temperature T is
The temperature rises after shifting to the low power period PH3 and reaches the standby temperature Tp.

According to the present embodiment, since the second transition period PH22 in which the power Wm smaller than the standby power Wp is supplied is provided, the discharge lamp temperature T rapidly decreases in the transition period PH2. Thereby, condensation of mercury Hg is further promoted during the transition period PH2, and as a result, after the projector 1A is extinguished, it is further suppressed that mercury Hg is condensed and attached to the first electrode 92 and the second electrode 93. it can.

  In the present embodiment, the following configuration may be employed.

In the present embodiment, the driving power W may be changed stepwise in the first transition period PH21 and the third transition period PH23.

In the above description, the change in the fan voltage Vf is the same as the change in the fan voltage Vf shown in FIG. 4B, but is not limited thereto. In the present embodiment, the fan voltage Vf is as shown in FIG.
And it is good also as a structure which changes as shown in FIG.

Further, in the present embodiment, as in the second embodiment, the cooling period P3 is included in the low power period PH3.
It is good also as a structure in which H31 is provided.

In the present embodiment, the high output mode fan voltage Vf in the transition period PH2 and the cooling period PH31 may be set based on the value of the driving power W (standby power Wp) in the low power period PH3.

(Fourth embodiment)
The fourth embodiment is based on the driving power W in the low power period PH3 with respect to the first embodiment.
The difference is that the execution time of the high output mode in the transition period PH2 is controlled.
In the following description, the same components as those in the above-described embodiment may be omitted by appropriately attaching the same reference numerals.

FIG. 11 is a graph showing an example of the relationship between the driving power W in the low power period PH3 and the execution time Sp of the high output mode in the transition period PH2. In FIG. 11, the horizontal axis represents the drive power W, and the vertical axis represents the execution time Sp. In the example shown in FIG. 11, in the range where the driving power W in the low power period PH3 is Wm2 or more and smaller than Ws, the execution time Sp
Is set to 0. That the execution time Sp is set to 0 means that the high output mode is not executed in the transition period PH2.

In a range where the driving power W in the low power period PH3 is smaller than Wm2, the high output mode is executed. The execution time Sp of the high output mode is determined according to the driving power W in the low power period PH3. Specifically, for example, the driving power W in the low power period PH3 is
In the case of Wm3, Wm4, and Wp, the execution time Sp is set to Sp1, Sp2, and Sp3, respectively.
The change of the driving power W in the transition period PH2 of the present embodiment changes linearly as in the first embodiment.

FIG. 12 is a graph showing an example of the waveform of the fan voltage Vf in the present embodiment. FIG.
2, the horizontal axis indicates time time, and the vertical axis indicates the fan voltage Vf. In FIG. 12, the driving power W in the low power period PH3 is Ws, Wm1, Wm2, Wm3, W
The change of the fan voltage Vf in the case of m4 and Wp is shown, respectively. The steady fan voltage in the steady output mode in the low power period PH3 is Vfs and Vfm when the driving power W in the low power period PH3 is Ws, Wm1, Wm2, Wm3, Wm4, and Wp, respectively.
1, Vfm2, Vfm3, Vfm4, and Vfp.

Note that the drive power W in the low power period PH3 is the steady lighting power Ws means that the drive power W does not change from the steady lighting period PH1. In this case, the transition period PH2 is not provided, and the fan voltage Vf does not change.

As shown in FIG. 12, when the driving power W in the low power period PH3 is Wm1 and Wm2, the high output mode is not executed, and the fan voltage Vf in the transition period PH2 becomes the steady fan voltage in the steady output mode. Is set. That is, the transition period P of this embodiment
In H2, the fan voltage Vf changes linearly according to the drive power W changing linearly.

When the driving power W in the low power period PH3 is Wm3, Wm4, Wp, the transition period PH2
The high output mode is executed in accordance with each driving power W.
When the driving power W in the low power period PH3 is the power Wm3, the time ts to the time t
The high output mode is executed for the execution time Sp1 up to m1. That is, from time ts to time t
In the period up to m1, the fan voltage Vf is set to the steady fan voltage Vfs in the steady output mode in the steady lighting period PH1 as the second output. On the other hand, from time tm1 to time t
During e, the fan voltage Vf is set to the steady fan voltage in the steady output mode according to the change in the driving power W. Therefore, fan voltage Vf changes linearly according to drive power W between time tm1 and time te.

When the driving power W in the low power period PH3 is the power Wm4, the time ts to the time tm
The high output mode is executed for the execution time Sp2 up to 2. That is, from time ts to time t
In the period up to m2, the fan voltage Vf is set to the steady fan voltage Vfs in the steady output mode in the steady lighting period PH1 as the second output. On the other hand, from time tm2 to time t
During e, the fan voltage Vf is set to the steady fan voltage in the steady output mode according to the change in the driving power W. Therefore, fan voltage Vf changes linearly according to drive power W between time tm2 and time te.

When the drive power W in the low power period PH3 is the standby power Wp, as in the first embodiment, the entire transition period PH2, that is, the execution time Sp from the time ts to the time te
In step 3, the high output mode is executed. In this case, the waveform of the fan voltage Vf is
In the first embodiment, the fan voltage Vf is the same as the waveform of the fan voltage Vf shown in FIG. 4B, and the fan voltage Vf in the high output mode in the transition period PH2 is the fan voltage value in the steady output mode in the steady lighting period PH1. Held at Vfs.

In the present embodiment, the fan control device 200b uses the relationship between the driving power W and the execution time Sp of the high output mode as shown in FIG. 11 based on the driving power W set in the low power period PH3. The execution time Sp of the output mode is set.
In other words, the fan control device 200b determines whether or not to execute the high output mode based on the driving power W set in the low power period PH3, and when executing the high output mode, in the low power period PH3. Based on the set drive power W, the execution time Sp of the high output mode is set.

According to the present embodiment, the high output mode can be appropriately executed according to the driving power W in the low power period PH3. Details will be described below.

When the driving power W set in the low power period PH3 is relatively high, the temperature of the first electrode 92 and the second electrode 93 relative to the temperature of the inner wall of the discharge lamp main body 510 is relatively high. Even if 1A is turned off, the first electrode 92 and the second electrode
Prior to the electrode 93, the discharge lamp main body 510 is likely to have a lower temperature, and the condensation of mercury Hg tends to occur on the inner wall of the discharge lamp main body 510. Accordingly, when the driving power W in the low power period PH3 is relatively high, mercury Hg is present in the first electrode 92 and the second electrode 93 as compared with the case in which the driving power W in the low power period PH3 is relatively low. There is a low possibility of adhesion and short circuit.

On the other hand, if the discharge lamp body 510 is excessively cooled, the halogen cycle is less likely to occur, and blackening may occur.
Therefore, when the driving power W in the low power period PH3 is set to a relatively high driving power W, the possibility that mercury Hg adheres to the first electrode 92 and the second electrode 93 is low. It is preferable to suppress the discharge lamp 90 from being excessively cooled and to suppress blackening by not executing the above or by setting the execution time Sp of the high output mode to be short.

Therefore, according to this embodiment, since the execution of the high output mode and the execution time Sp of the high output mode are set based on the drive power W of the low power period PH3, the drive power W of the low power period PH3 is set. Accordingly, the fan voltage Vf can be set appropriately.

  In the present embodiment, the following configuration may be employed.

In the above description, as illustrated in FIG. 11, the driving power W in the low power period PH3 is Wm.
When it is smaller than 2, the execution time Sp of the high output mode is set according to the value of the drive power W. However, the present invention is not limited to this. In the present embodiment, for example, the fan control device 200b may be configured to determine only whether or not the high output mode is executed. In particular,
In the present embodiment, for example, when the driving power W in the low power period PH3 is Wm2 or more,
When the high power mode is not executed and the driving power W in the low power period PH3 is smaller than Wm2,
The high output mode is executed throughout the transition period PH2, that is, the execution time S of the high output mode.
It is good also as a structure which sets p to Sp3.

In the above description, the fan voltage Vf in the high output mode is the steady lighting period P.
Although the steady fan voltage Vfs in the steady output mode in H1 is used, the present invention is not limited to this. The fan voltage Vf in the high output mode of the present embodiment may be set like the fan voltage Vf shown in FIGS.

Further, the fan voltage Vf in the high output mode of the present embodiment may be set based on the driving power W in the low power period PH3.

In the present embodiment, the execution time Sp of the high output mode may be set based on the ambient temperature of the projector 1A.

Further, in the present embodiment, based on the difference between the steady lighting power Ws in the steady lighting period PH1 and the driving power W in the low power period PH3, it is determined whether or not to execute the high output mode, and the execution time of the high output mode. Sp may be set.

DESCRIPTION OF SYMBOLS 1A ... Projector, 5 ... Light source device, 10 ... Discharge lamp lighting device (discharge lamp drive part), 45
... Projection optical device (projection optical system), 90 ... Discharge lamp, Hg ... Mercury, Sp, Sp1, Sp2, S
p3: execution time, Wm: power (third drive power), Wp: standby power (second drive power)
, Ws ... steady lighting power (first driving power), 200b ... fan control device (control unit), 510
... discharge lamp body, CU2 ... second cooling device (cooling unit), PH1 ... steady lighting period (first driving period), PH2 ... transition period, PH3 ... low power period (second driving period), T ... discharge lamp temperature , W: Driving power

Claims (14)

A discharge lamp that emits light;
A discharge lamp driving unit for supplying driving power to the discharge lamp;
A cooling section for cooling the discharge lamp;
A control unit for controlling the cooling unit;
With
The discharge lamp driving unit includes a first driving period in which a first driving power is supplied to the discharge lamp, and a second driving period in which a second driving power smaller than the first driving power is supplied to the discharge lamp; Supplying the driving power to the discharge lamp so as to be provided with a transition period for shifting from the first driving period to the second driving period,
The controller is
A first output drive for driving the cooling unit with a first output proportional to the drive power; and a second output drive for driving the cooling unit with a second output greater than the first output with respect to the drive power; ,
Is possible and
In at least part of the first driving period and at least part of the second driving period,
Performing the first output drive;
The light source device is characterized in that the second output drive is executed in at least a part of the transition period. A discharge lamp that emits light;
A discharge lamp driving unit for supplying driving power to the discharge lamp;
A cooling section for cooling the discharge lamp;
A control unit for controlling the discharge lamp driving unit and the cooling unit;
With
The discharge lamp driving unit includes a first driving period in which a first driving power is supplied to the discharge lamp, and a second driving period in which a second driving power smaller than the first driving power is supplied to the discharge lamp; And controlling the discharge lamp driving unit so as to provide a transition period for transitioning from the first driving period to the second driving period,
The controller is
A first output drive for driving the cooling unit with a first output proportional to the drive power; and a second output drive for driving the cooling unit with a second output greater than the first output with respect to the drive power; ,
Is possible and
In at least part of the first driving period and at least part of the second driving period,
Performing the first output drive;
A light source device that determines whether or not the second output drive is executed in at least a part of the transition period based on the second drive power. The light source device according to claim 1, wherein the second output is equal to the first output that drives the cooling unit in the first driving period. 3. The light source device according to claim 1, wherein the second output is larger than the first output for driving the cooling unit in the first drive period. The light source device according to claim 1, wherein the second output is set based on the second drive power. The light source device according to claim 1, wherein the second output is set based on an ambient temperature. The light source device according to any one of claims 1 to 6, wherein the second output drive is executed across the transition period and the second drive period. The light source device according to claim 1, wherein an execution time of the second output drive is set based on the second drive power. The discharge lamp includes a discharge lamp body in which mercury is sealed.
The controller controls the second output drive so that a discharge lamp temperature of the discharge lamp main body is lower than the discharge lamp temperature maintained when the first output drive is executed in the second drive period. The light source device according to claim 1, wherein the light source device is executed. The discharge lamp includes a discharge lamp body in which mercury is sealed.
The light source device according to any one of claims 1 to 9, wherein the control unit executes the second output drive so that a discharge lamp temperature of the discharge lamp main body is equal to or lower than a condensation temperature of the mercury. The light source device according to any one of claims 1 to 10, wherein the control unit supplies a third drive power smaller than the second drive power to the discharge lamp during at least a part of the transition period. The light source device according to any one of claims 1 to 11,
A light modulation element that modulates light emitted from the light source device according to a video signal;
A projection optical system for projecting light modulated by the light modulation element;
A projector comprising: A discharge lamp cooling method comprising: a discharge lamp that emits light; a discharge lamp driving unit that supplies driving power to the discharge lamp; and a cooling unit that cools the discharge lamp,
A first drive period during which a first drive power is supplied to the discharge lamp;
A second driving period in which a second driving power smaller than the first driving power is supplied to the discharge lamp;
A transition period of transition from the first drive period to the second drive period;
Set
In at least part of the first driving period and at least part of the second driving period,
Driving the cooling unit with a first output proportional to the driving power;
The cooling method for a discharge lamp, wherein the cooling unit is driven with a second output larger than the first output with respect to the driving power in at least a part of the transition period. A discharge lamp cooling method comprising: a discharge lamp that emits light; a discharge lamp driving unit that supplies driving power to the discharge lamp; and a cooling unit that cools the discharge lamp,
A first drive period during which a first drive power is supplied to the discharge lamp;
A second driving period in which a second driving power smaller than the first driving power is supplied to the discharge lamp;
A transition period of transition from the first drive period to the second drive period;
Set
In at least part of the first driving period and at least part of the second driving period,
Driving the cooling unit with a first output proportional to the driving power;
Based on the second driving power, whether or not the cooling unit is driven by a second output larger than the first output with respect to the driving power is determined in at least a part of the transition period. Cooling method for the discharge lamp.

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