JP2007219153A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector for maintaining cooling efficiency even when a heating value and temperature in the projector are increased. <P>SOLUTION: The projector is equipped with: a light source driving block 5 and a power source block 6 housed in the outside case of the projector and respectively generating heat in accordance with an operation state; and a fan arranged between the light source driving block 5 and the power source block 6, and having a first suction port for sucking air through the light source driving block 5, a second suction port 72 sucking the air inside the outside case, and a discharge port 73 discharging the sucked air to the power source block 6. The second suction port 72 is provided with sealing material 8 capable of adjusting the aperture area of the second suction port 72. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector.

2. Description of the Related Art Conventionally, there is known a projector that modulates a light beam emitted from a light source with a light modulation device in accordance with image information to form an optical image and projects the optical image in an enlarged manner.
Such a projector includes a configuration that generates heat during operation, for example, a light source, a light modulation device, a light source driving block that supplies power to the light source to drive it, a power supply block that supplies power to the control device, and the like. ing. Since the heat generated during operation eventually causes malfunction of the projector, many projectors have a cooling function for cooling these components (for example, see Patent Document 1).

  The projector described in Patent Document 1 includes a cooling fan for cooling the light source drive block and the power supply block. The cooling fan cools the power supply block by sucking outside air through the power supply block, and further cools the light source drive block by discharging the sucked air to the light source drive block.

JP 2000-10191 A

By the way, increasing the brightness of the projector is often performed by increasing the output of the light source, not by changing the design specifications of the optical components. However, in the projector described in Patent Document 1, the heat generation amount and temperature of the light source drive block and the power supply block increase as the output of the light source increases. Then, for example, when the temperature of the power supply block rises rapidly, the air that has cooled the power supply block becomes high temperature, and thus the light source drive block may not be sufficiently cooled.
For this reason, the projector described in Patent Document 1 requires a large-scale configuration change such as an increase in the size of the cooling fan in order to increase the cooling efficiency in the projector without changing the design specifications of the optical components. turn into. In addition, it is possible to increase the cooling efficiency by increasing the number of rotations of the cooling fan without changing the configuration of the projector, but this increases the power consumption by driving the fan and further reduces noise. growing.

As described above, the projector described in Patent Document 1 has a problem in that the cooling efficiency in the projector is not maintained when the specification is changed to increase the heat generation amount and the temperature in the projector, such as an increase in the output of the light source. is there.
A similar problem occurs for a projector that can change the output of the light source in accordance with the use situation.

  An object of the present invention is to provide a projector that can maintain cooling efficiency even when the amount of heat generation and temperature in the projector change.

  In order to achieve the above object, a projector according to the present invention includes a light source, a light modulation device that modulates a light beam emitted from the light source according to image information, and forms an optical image, and the light modulation device. A projector having a projection optical device for enlarging and projecting an optical image and an exterior housing for housing each of the devices. The projector is housed in the exterior housing and generates heat according to the operating state of the projector. A first cooling target and a second cooling target, and a first suction port that is disposed between the first cooling target and the second cooling target and sucks air that has passed through the first cooling target; And a fan having a discharge port for discharging the sucked air to the second cooling target, and the second suction port has an opening area of the second suction port. Adjustable opening Wherein the product adjusting means.

  Here, the projector includes a first cooling target and a second cooling target that generate heat during operation. The calorific values of the first cooling object and the second cooling object change according to the output fluctuation of the light source. For example, when the heat generation amount of the first cooling target increases, the air that has cooled the first cooling target becomes high temperature, and then the second cooling target cannot be sufficiently cooled.

On the other hand, according to the present invention, the projector has a first suction port for sucking air through the first cooling target, a second suction port for sucking air in the projector exterior housing, and the second suction air. A fan having a discharge port for discharging to a cooling target is provided, and an opening area adjusting means for adjusting the opening area of the second suction port is provided in the second suction port. According to this, the opening area adjusting means can adjust the opening area of the second suction port according to the heat generation amounts of the first and second cooling objects.
For example, when the heat generation amount of the first cooling target increases, the air sucked into the fan through the first suction port is at a high temperature. At this time, since the opening area adjusting means increases the opening area of the second suction port, the amount of air sucked into the fan through the second suction port increases. Then, since the amount of air mixed with the high-temperature air sucked through the first air intake port increases, the temperature rise of the air discharged from the discharge port is suppressed. And the 2nd cooling object can be cooled with the air discharged from this discharge port.

  As described above, the projector of the present invention can maintain the cooling efficiency even when the specification is changed so that the heat generation amount and temperature in the projector change. This eliminates the need to change the projector configuration on a large scale. Furthermore, since the appropriate cooling can be realized by adjusting the opening area of the inlet of the fan, it is not necessary to increase the rotational speed of the fan. Therefore, power consumption due to an increase in the rotation speed of the fan can be suppressed, and energy saving can be achieved. Furthermore, an increase in noise due to an increase in the rotation speed of the fan can be prevented.

In the present invention, the opening area adjusting means is preferably a sheet-like member that partially closes the second suction port.
According to the present invention, since the opening area adjusting means is a sheet-like member, the configuration can be simplified. Further, since the sheet-like member can be easily attached to and detached from the outer surface of the fan around the second suction port, the opening and closing of the second suction port is simple. Furthermore, since the opening area adjusting means is a sheet-like member, the projector is not increased in size and weight.

  In the present invention, a temperature sensor that detects at least one target temperature of the first cooling target and the second cooling target, a temperature acquisition unit that acquires the target temperature detected by the temperature sensor, and the temperature acquisition A temperature determination unit that determines whether or not the target temperature acquired by the unit is equal to or higher than a predetermined temperature, and the opening area adjustment when the temperature determination unit determines that the target temperature is equal to or higher than the predetermined temperature Preferably, the means includes an opening area adjustment control unit that opens the opening area of the second suction port by a predetermined amount.

According to the present invention, the opening area of the second suction port of the fan is adjusted according to the target temperature of at least one of the first cooling target and the second cooling target. For example, when the target temperature of the first cooling target increases, the temperature of the air sucked from the first suction port of the fan also increases. Eventually, when the temperature determining unit determines that the target temperature of the first cooling target is equal to or higher than the predetermined temperature, the opening area adjusting means opens the opening area of the second suction port of the fan by a predetermined amount. Then, since the amount of air sucked into the fan from the second suction port, that is, the amount of air mixed with the high-temperature air sucked from the first suction port increases, the temperature of the air discharged from the discharge port increases. Is suppressed. Thereby, even when the target temperature of the first cooling target rises due to a change in the specification of the projector, long-time driving, etc., the second cooling target can be sufficiently cooled.
Therefore, the projector of the present invention can quickly respond to the temperature change of the first cooling object and the second cooling object, and can sufficiently cool each cooling object.

In the present invention, it is preferable that the first cooling target is a light source drive block that drives the light source, and the second heat generating unit is a power supply block that supplies power to the light source and the light modulation device.
Compared with the power supply block, the light source drive block has a large change in the amount of heat generated due to the output fluctuation of the light source of the projector, and is liable to cause malfunction due to heat. On the other hand, according to the present invention, the light source drive block is first cooled by the ventilation of the fan, and then the power supply block is cooled. That is, since the light source drive block can be cooled with relatively cool air, it is possible to prevent an operation failure due to heat of the light source drive block. In addition, the opening area adjusting means adjusts the opening area of the second suction port of the fan according to the temperature change of the light source drive block, so that the temperature of the air discharged from the discharge port can be sufficiently reduced. It can be maintained at a possible temperature.

<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS.
[Configuration of Projector 1]
FIG. 1 is a diagram schematically showing a schematic configuration of the projector 1.
The projector 1 modulates the light beam emitted from the light source device 411 according to image information to form an optical image, and enlarges and projects the formed optical image on a screen (not shown) by the projection lens 3.
As shown in FIG. 1, the projector 1 includes an exterior housing 2, a projection lens 3 as a projection optical device, an optical unit 4, a light source drive block 5 as a first cooling target, and a second cooling target. A power supply block 6, a control device (not shown) for controlling the entire projector 1, a sirocco fan (not shown) for cooling the optical unit 4 by blowing air, a sirocco fan 7 for cooling the light source drive block 5 and the power supply block 6, It has.

As shown in FIG. 1, the outer casing 2 is formed in a substantially rectangular parallelepiped shape that accommodates and arranges the components 3 to 6 and the like inside.
The exterior housing 2 is formed with an intake port 21 for taking in cooling air outside the exterior housing 2 to the side of the projection lens 3, and at the corner on the opposite side of the projection lens 3 from the front of the projector 1, An exhaust port 22 for exhausting the air in the exterior housing 2 is formed. In addition, the exterior housing 2 has an air inlet (not shown) formed below the projection lens 3.

The optical unit 4 is a unit that optically processes the light beam emitted from the light source device 411 and forms an optical image corresponding to the image information under the control of the control device. As shown in FIG. 1, the optical unit 4 has a substantially L shape in plan view extending along the back surface of the exterior housing 2 and extending along the side surface of the exterior housing 2. The detailed configuration of the optical unit 4 will be described later.
The projection lens 3 enlarges and projects the optical image formed by the optical unit 4 on the screen. The projection lens 3 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical lens barrel.

[Detailed Configuration of Optical Unit 4]
As shown in FIG. 1, the optical unit 4 includes an illumination optical device 41, a color separation optical device 42, a relay optical device 43, and an optical device 44.
The illumination optical device 41 is an optical system for substantially uniformly illuminating an image forming area of a liquid crystal panel, which will be described later, constituting the optical device 44. As shown in FIG. 1, the illumination optical device 41 includes a light source device 411, a first lens array 412, a second lens array 413 as a condensing device, a polarization conversion element 414, and a superimposing device as a condensing device. A lens 415.

  As shown in FIG. 1, the light source device 411 includes a light source lamp 416 that emits a radial light beam, a reflector 417 that reflects the emitted light emitted from the light source lamp 416 and converges it at a predetermined position, and the reflector 417 converges the light. And a collimating concave lens 418 for collimating the luminous flux with respect to the optical axis A. As the light source lamp 416, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is frequently used. Further, the reflector 417 is composed of an ellipsoidal reflector having a spheroidal surface, but may be composed of a parabolic reflector having a rotational paraboloid. In this case, the collimating concave lens 418 is omitted.

The first lens array 412 has a configuration in which small lenses having a substantially rectangular outline when viewed from the optical axis A direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source device 411 into a plurality of partial light beams.
The second lens array 413 has substantially the same configuration as the first lens array 412, and has a configuration in which small lenses are arranged in a matrix. The second lens array 413, together with the superimposing lens 415, has a function of forming an image of each small lens of the first lens array 412 on an image forming area of a liquid crystal panel described later of the optical device 44.

The polarization conversion element 414 is disposed between the second lens array 413 and the superimposing lens 415, and converts light from the second lens array 413 into one type of polarized light.
Specifically, each partial light converted into one type of polarized light by the polarization conversion element 414 is finally substantially superimposed on an image forming area of a liquid crystal panel (to be described later) of the optical device 44 by the superimposing lens 415. In a projector using a liquid crystal panel of a type that modulates polarized light, only one type of polarized light can be used, and therefore approximately half of the light from the light source device 411 that emits randomly polarized light cannot be used. For this reason, by using the polarization conversion element 414, the light emitted from the light source device 411 is converted into substantially one type of polarized light, and the light use efficiency in the optical device 44 is increased.

As shown in FIG. 1, the color separation optical device 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423, and a plurality of partial light beams emitted from the illumination optical device 41 by the dichroic mirrors 421 and 422. It has a function of separating into three color lights of red, green and blue.
The relay optical device 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 434, and has a function of guiding the color light separated by the color separation optical device 42 to a liquid crystal panel for red light.

  At this time, the dichroic mirror 421 of the color separation optical device 42 transmits the red light component and the green light component of the light beam emitted from the illumination optical device 41 and reflects the blue light component. The blue light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423 and passes through the field lens 419 to reach the liquid crystal panel for blue light. The field lens 419 converts each partial light beam emitted from the second lens array 413 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 419 provided on the light incident side of the other liquid crystal panels for green light and red light.

  Of the red light and green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, passes through the field lens 419, and reaches the liquid crystal panel for green light. On the other hand, the red light passes through the dichroic mirror 422, passes through the relay optical device 43, and further passes through the field lens 419 to reach the liquid crystal panel for red light. Note that the relay optical device 43 is used for red light because the optical path length of the red light is longer than the optical path lengths of the other color lights, thereby preventing a decrease in light use efficiency due to light diffusion or the like. It is to do. That is, this is to transmit the partial light beam incident on the incident side lens 431 to the field lens 419 as it is. The relay optical device 43 is configured to pass red light out of the three color lights, but is not limited thereto, and may be configured to pass blue light, for example.

The optical device 44 includes three liquid crystal panels 441 as light modulation devices (441 R for a red light liquid crystal panel, 441 G for a green light liquid crystal panel, and 441 B for a blue light liquid crystal panel) and three incident light beams. A side polarizing plate 442, three exit side polarizing plates 443, and a cross dichroic prism 444 are provided.
As shown in FIG. 1, the three incident-side polarizing plates 442 are respectively arranged in the rear stage of the optical path of each field lens 419. These incident-side polarizing plates 442 receive the respective color lights whose polarization directions are aligned in substantially one direction by the polarization conversion element 414, and of the incident light beams, the polarization orientations of the light beams aligned by the polarization conversion element 414 are substantially the same. It transmits only polarized light in the same direction and absorbs other light beams. Although not shown in the drawing, these incident side polarizing plates 442 have a configuration in which a polarizing film is pasted on a translucent substrate such as sapphire or quartz.

As shown in FIG. 1, the three liquid crystal panels 441 are respectively arranged on the rear side of the optical path of each incident side polarizing plate 442. Although not shown, these liquid crystal panels 441 have a configuration in which a liquid crystal, which is an electro-optical material, is hermetically sealed between a pair of transparent glass substrates, and a predetermined pixel is selected according to a drive signal output from a control device. The alignment state of the liquid crystal at the position is controlled, and the polarization direction of the polarized light beam emitted from each incident-side polarizing plate 442 is modulated.
As shown in FIG. 1, the three exit-side polarizing plates 443 are respectively arranged in the rear stage of the optical path of each liquid crystal panel 441. These exit-side polarizing plates 443 have substantially the same configuration as the incident-side polarizing plate 442, and although not shown, have a configuration in which a polarizing film is attached to a light-transmitting substrate. The polarizing film constituting the exit side polarizing plate 443 is disposed so that the transmission axis that transmits the light beam is substantially orthogonal to the transmission axis that transmits the light beam at the incident side polarizing plate 442.

  The cross dichroic prism 444 is an optical element that is arranged in the downstream of the light path of the exit side polarizing plate 443 and forms a color image by combining optical images modulated for each color light emitted from the exit side polarizing plates 443. The cross dichroic prism 444 has a square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. These dielectric multilayer films reflect each color light emitted from the liquid crystal panels 441R and 441B through the respective emission side polarizing plates 443, and pass through the color light emitted from the liquid crystal panel 441G and the emission side polarizing plates 443. In this manner, the color lights modulated by the liquid crystal panels 441 are combined to form a color image.

[Configuration of Light Source Drive Block 5 and Power Supply Block 6]
Next, the light source drive block 5 and the power supply block 6 will be described. As shown in FIG. 1, the light source drive block 5 is disposed along the projection direction of the projection lens 3, and the power supply block 6 is disposed above the light source drive block 5 along the front surface of the exterior housing 2.
Here, for convenience of explanation, the projection direction of the projection lens 3 is the F-RE direction, the projection direction proximal end side is the RE direction, and the projection direction distal end side is the F direction. Furthermore, the direction along the front surface of the outer casing 2 is defined as the L-RI direction, the light source device 411 side is defined as the L direction, and the side opposite to the light source device 411 is defined as the RI direction.
2 is a perspective view of the light source drive block 5 and the power supply block 6 as viewed from the left side, and FIG. 3 is a perspective view of the light source drive block 5 and the power supply block 6 as viewed from the front side.

As shown in FIG. 2, the light source drive block 5 includes a light source drive circuit board 51 that supplies power to the light source lamp 416 and lights the light source lamp 416, and a casing 52 that houses the light source drive circuit board 51. Yes.
The light source drive circuit board 51 generates heat when a current flows therethrough.
The housing 52 includes an outer opening 521 having a front end surface opened, and a circular window 522 formed in a circular shape behind the upper surface on which the power supply block 6 is not placed. The outer opening 521 is disposed to face the air inlet 21 of the exterior housing 2. That is, the inside of the housing 52 and the outside of the exterior housing 2 can be ventilated through the air inlet 21.

  Further, the casing 52 is slightly larger than the light source driving circuit board 51, and a clearance is formed between the inner wall of the casing 52 and the light source driving circuit board 51. Thereby, the air outside the exterior casing 2 can flow into the casing 52 from the outer opening 521 and can flow out of the circular window 522 through the clearance.

As shown in FIGS. 2 and 3, the power supply block 6 includes a power supply circuit board 61 that supplies power to each component in the projector 1 and a casing 62 that houses the power supply circuit board 61.
The power supply circuit board 61 generates heat when a current flows therethrough.
The housing 62 includes an outer opening 621 whose left end face is opened, and a rectangular window 622 formed on the right side of the rear end face. The outer opening 621 is disposed to face the exhaust port 22 of the exterior housing 2. That is, the inside of the housing 62 and the outside of the exterior housing 2 can be ventilated through the exhaust port 22.
Further, in the case 62, as in the case 52, a clearance is formed between the inner wall of the case 62 and the power circuit board 61. Thereby, the air that has flowed into the casing 62 from the rectangular window 622 can flow out of the circular window 522 through the clearance.

[Configuration of Sirocco fan 7]
As shown in FIGS. 2 and 3, the sirocco fan 7 is arranged at the rear end of the upper surface of the light source drive block 5. The sirocco fan 7 cools the light source drive block 5 and the power supply block 6 by blowing air.
FIG. 4 is a perspective view of the sirocco fan 7 as viewed from above.
The sirocco fan 7 includes a first suction port 71 (FIGS. 2 and 3), a second suction port 72, and a discharge port 73. The sirocco fan 7 sucks air from the suction ports 71 and 72 and discharges the sucked air. Discharge from the outlet 73.

The first suction port 71 is formed in a circular shape on the lower surface of the sirocco fan 7 and is disposed so as to face the circular window 522 of the light source drive block 5. That is, the first suction port 71 sucks air in the housing 52 through the circular window 522.
The second suction port 72 includes three arc-shaped ports 721, 722 and 723 that are formed on the upper surface of the sirocco fan 7 and have the same center. The second suction port 72 is opened toward the exterior casing 2 and sucks air in the exterior casing 2.
A sealing material 8 formed of a sheet-like member is attached to the second suction port 72 as an opening area adjusting means. The sealing material 8 will be described in detail later.

  The discharge port 73 is formed in a rectangular shape on the front side of the side surface connecting the upper surface and the lower surface of the sirocco fan 7, and is disposed to face the rectangular window 622 of the power supply block 6. That is, the discharge port 73 discharges the air sucked from the first and second suction ports 71 and 72 into the housing 62 through the rectangular window 622.

  When the sirocco fan 7 is driven, the following air flow path is formed in the light source drive block 5 and the power supply block 6. That is, by driving the sirocco fan 7, air outside the exterior housing 2 is sucked into the housing 52 through the air inlet 21 and the outer opening 521. Then, the air sucked into the housing 52 is blown rearward while cooling the light source drive circuit board 51 and is sucked into the first suction port 71 of the sirocco fan 7 through the circular window 522. The temperature of the air sucked from the first suction port 71 is increased by cooling the light source drive circuit board 51. On the other hand, air in the exterior housing 2 is sucked from the second suction port 72.

The air sucked into the sirocco fan 7 from the first suction port 71 is mixed with the air sucked from the second suction port 72 inside the sirocco fan 7, and then the casing is formed from the discharge port 73 through the rectangular window 622. The liquid is discharged into 62.
The air discharged from the discharge port 73 into the housing 62 is blown to the left while cooling the power circuit board 61, and is exhausted outside the exterior housing 2 through the outer opening 621 and the exhaust port 22. In this way, the light source drive block 5 and the power supply block 6 are cooled.

The sealing material 8 is affixed according to the internal temperature of the light source drive block 5 when the projector 1 is manufactured.
Specifically, the internal temperature of the light source drive block 5 is measured in a state where the sealing material 8 is pasted to the second suction port 72 in advance before the projector 1 is manufactured, and the internal temperature, that is, the air discharged from the discharge port 73. The projector 1 is assembled while adjusting the temperature so that the temperature does not affect the driving of the power supply block 6.
For example, when the heat generation amount of the light source drive block 5 is large, the sealing material 8 is attached with the most part of the second suction port 72 opened. Then, since the amount of air sucked from the second suction port 72 is large, the temperature rise of the air discharged from the discharge port 73 is suppressed.

  As described above, the internal temperature of the light source drive block 5 varies according to the output value of the light source lamp 416, but when the projector 1 is manufactured, the opening area of the second suction port 72 is set by the sealant 8 according to the internal temperature. By adjusting, the cooling efficiency of the light source drive block 5 and the power supply block 6 by the sirocco fan 7 can be maintained even when the light source lamp 416 having any output value is mounted on the projector 1. Therefore, it is possible to change the specification of the projector 1 that increases the output of the light source lamp 416 without changing the configuration of the projector 1 on a large scale.

In addition to the internal temperature of the light source driving block 5, the sealing material 8 may be attached or detached when a change in the heat generation amount of the light source driving block 5 estimated from the specification conditions is used as a judgment material when the specification of the projector 1 is changed. Good.
As described above, in the sirocco fan 7, when the projector 1 is manufactured, the opening area of the second suction port 72 is adjusted by the sealing material 8 according to the internal temperature of the light source drive block 5, and the air discharged from the discharge port 71. The temperature is adjusted.

Second Embodiment
A second embodiment of the present invention will be described with reference to FIGS. In the following description, parts that are the same as or substantially the same as those already described are given the same reference numerals and description thereof is omitted.
The projector 1 according to this embodiment is different from the above embodiment in the configuration and control of the opening area adjusting means.
FIG. 5 is a block diagram showing a functional configuration of the projector 1 related to the control of the opening area adjusting means in this embodiment, and FIG. 6 is a top view showing a state in which the shutter 10 as the opening area adjusting means is operated. It is a perspective view.
As shown in FIG. 5, the projector 1 includes an operation panel 23, a temperature sensor 90, a shutter 10 as an opening area adjusting unit, and a control device 9 that controls the shutter 10.

The operation panel 23 is provided on the outer surface of the exterior housing 2 and a remote controller (not shown) for remotely operating the projector 1. The operation panel 23 has a plurality of operation buttons and outputs an operation signal corresponding to an input operation of these operation buttons to the control device 9. Examples of the operation signal include a power on / off signal for powering on / off the projector 1.
The temperature sensor 90 is installed in the housing 52 of the light source drive block 5. The temperature sensor 90 measures resistance value data corresponding to the internal temperature T in the housing 52 and outputs it to the control device 9. The internal temperature T of the light source drive block 5 corresponds to the target temperature of the present invention.
As shown in FIG. 6, the shutter 10 is provided above the sirocco fan 7. The shutter 10 rotates with one end as a fulcrum according to control by the control device 9, and sequentially opens and closes the arc-shaped ports 721, 722, 723 of the second suction port 72. FIG. 6 shows a state where the arc-shaped ports 721 and 722 of the second suction port 72 are closed by the shutter 10.

The control device 9 includes an input signal processing unit 91 that processes various operation signals output from the operation panel 23, a memory 92, and a cooling processing unit 93.
Among these, the memory 92 stores a program processed by the control device 9 and various data. For example, the memory 92 stores a shutter control program used for controlling the shutter 10 of the projector 1 and reference temperatures T ₁ , T ₂ , T _{3 and the} like described later.

The cooling processing unit 93 performs drive control of the shutter 10 according to the temperature change in the light source drive block 5. The cooling processing unit 93 includes a temperature acquisition unit 931, a first temperature determination unit 932, a second temperature determination unit 933, a third temperature determination unit 934, and a shutter control unit 935.
When acquiring the resistance value data detected by the temperature sensor 90, the temperature acquisition unit 931 analyzes the resistance value data and acquires the internal temperature T of the light source drive block 5.

The first, second, and third temperature determination units 932, 933, and 934 compare the internal temperature T acquired by the temperature acquisition unit 931 with the reference temperatures T ₁ , T ₂ , and T ₃ , respectively. Incidentally, the reference temperature _{T 1,} T 2, _{T 3 is T 1 <T 2 <T 3} .
The first temperature determination unit 931 reads the reference temperature T ₁ recorded in the memory 92 and determines whether or not the internal temperature T is lower than the reference temperature T ₁ .
Second temperature determination unit 932, when the internal temperature T by the first temperature determination unit 931 is determined to be the reference temperature T ₁ or more, reads the reference temperature T _2, which is recorded in the memory 92, the internal temperature T determines whether less than the reference temperature T _2.

Third temperature determination unit 934, when the internal temperature T by the second temperature determining unit 933 is determined to be the reference temperature T ₂ above, reads the reference temperature T ₃ that is recorded in the memory 92, the internal temperature T determines whether less than the reference temperature T _3.
The shutter control unit 935 rotates the shutter 10 based on the determination results by the temperature determination units 932, 933, and 934.

[Operation of the control device 9]
The effect | action of the control apparatus 9 is demonstrated using FIG. FIG. 7 is a flowchart for explaining the cooling process by the control device 9.
As shown in FIG. 7, the temperature acquisition unit 931 of the control device 9 analyzes the resistance value data detected by the temperature sensor 90, and acquires the internal temperature T of the light source drive block 5 (S1).
Next, the first temperature determination unit 932 determines whether or not the internal temperature T acquired in step S1 is lower than the reference temperature T ₁ (S2).
If the internal temperature T is determined to be lower than the reference temperature T _1, the shutter control unit 935 causes the entire closing the second intake port 72 by driving the shutter 10 (S3). In step S <b> 9, the input signal processing unit 91 monitors an input signal input to the control device 9.

On the other hand, if the internal temperature T in step S2 is determined as the reference temperature above T _1, the second temperature determining section 932 determines whether or not the internal temperature T is less than the reference temperature T ₂ (S4).
If the internal temperature T is determined to be less than the reference temperature T _2, the shutter control unit 935 drives the shutter 10, thereby opening the only arcuate opening 721 of the second suction port 72 (S5). At this time, the second suction port 72 is opened by 1/3 of the total opening area. In step S <b> 9, the input signal processing unit 91 monitors an input signal input to the control device 9.

On the other hand, in the process S4, when the internal temperature T is determined to be a reference temperature T ₂ above, the third temperature determination unit 934 determines whether or not the internal temperature T is less than the reference temperature T ₃ (S6) .
If the internal temperature T is determined to be less than the reference temperature T _3, a shutter control unit 935 drives the shutter 10, thereby opening the arcuate opening 721 and arcuate ports 722 of the second suction port 72 (S5) . At this time, 2/3 of the total opening area of the second suction port 72 is opened. In step S <b> 9, the input signal processing unit 91 monitors an input signal input to the control device 9.

On the other hand, in the process S6, when the internal temperature T is determined to be a reference temperature T ₃ above, the shutter control unit 935, the second suction port 72 is the full aperture by driving the shutter 10. In step S <b> 9, the input signal processing unit 91 monitors an input signal input to the control device 9.

In process S9, the input signal processing unit 91 monitors an input signal input to the control device 9, and determines whether or not a power-off instruction signal output from the operation panel 23 is input. When the power-off instruction signal is not input, the process returns to step S1, and the temperature acquisition unit 931 acquires the internal temperature T of the light source drive block 5 again.
On the other hand, when the power-off instruction signal is input, the shutter control unit 935 drives the shutter 10 to fully close the second suction port 72 (S10). And the control apparatus 9 complete | finishes a cooling process.

As described above, during the operation of the projector 1, the shutter 10 opens the arc-shaped ports 721, 722, 723 in order according to the internal temperature T of the light source driving block 5, thereby sucking from the second suction port 72. The amount of air is increased in stages, and the temperature rise of the air discharged from the discharge port 73 is suppressed. Therefore, the power supply block 6 can be sufficiently cooled by the air discharged from the discharge port 73.
Further, even when the output of the light source lamp 416 of the projector 1 is increased, the cooling efficiency is maintained without performing a large-scale configuration change of the projector 1 by increasing the opening area of the second suction port 72 by the shutter 10. be able to.

[Modification of Embodiment]
The best configuration for implementing the present invention has been disclosed in the above description, but the present invention is not limited to this. That is, since the embodiment does not limit the present invention, description of the names of members excluding some or all of the limitations on the shape, material, etc. is included in the present invention. is there.

In the present invention, the first cooling target may be the power supply block 6 and the second cooling target may be the light source drive block 5. The cooling target is not limited to the power supply block and the light source drive block, and the same effect can be obtained when the first cooling target is the optical device 44 and the second cooling target is the light source device 411.
In the first embodiment, the sealing material 8 may be attached according to the internal temperature of the power supply block 6. Furthermore, also in the second embodiment, a temperature sensor may be provided in the power supply block 6 to control the shutter 10 according to the internal temperature of the power supply block 6.
In the second embodiment, the shutter 10 may be controlled in accordance with the output switching of the light source lamp 416.
In the above embodiment, the second suction port 72 of the sirocco fan 7 is composed of three arc-shaped openings 721, 722, 723, but the number and shape of the arc-shaped openings are not limited.

  In the second embodiment, when it is determined in step S9 that the power-off signal has been input, the second suction port 72 is completely blocked in step S10, and the cooling process is terminated. However, in the present invention, after the power-off signal is input, the second suction port 72 may be fully opened while the sirocco fan 7 is driven, and may wait until the internal temperature T of the light source drive block 5 is sufficiently lowered. Then, after the internal temperature T has sufficiently decreased, the shutter control unit 935 may completely close the second suction port 72 and finish the cooling process.

In the above embodiment, only the front type projector 1 that performs image projection from the direction of observing the screen is illustrated, but the present invention also applies to a rear type projector that projects image from the side opposite to the direction of observing the screen. Applicable.
In the above-described embodiment, the configuration in which the optical unit 4 has a substantially L shape in plan view has been described. However, the configuration is not limited thereto, and for example, a configuration having a substantially U shape in plan view may be employed.
Furthermore, in the above-described embodiment, the transmissive liquid crystal panel 441 having a different light beam incident surface and light beam emission surface is used as the light modulation device. However, the reflection type liquid crystal panel in which the light incident surface and the light emission surface are the same. May be adopted.
In the above embodiment, the transmissive liquid crystal panel 441 is employed as the light modulation device. However, the present invention is not limited to this, and a reflective liquid crystal panel may be employed, or a device using micromirrors may be employed. It may be adopted.

1 is a schematic plan view showing an optical unit, a light source drive block, and a power supply block of a projector according to an embodiment of the invention. The perspective view which looked at the light source drive block and power supply block which concern on the said embodiment from the side. The perspective view which looked at the light source drive block and power supply block which concern on the said embodiment from the front. The perspective view which shows the sirocco fan which concerns on the said embodiment. The block diagram for demonstrating the functional structure of the control apparatus which concerns on the said embodiment. The perspective view which looked at the state which the shutter concerning the embodiment operated from the upper part. The flowchart for demonstrating the effect | action of the control apparatus which concerns on the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior housing, 3 ... Projection lens (projection optical apparatus), 411 ... Light source device, 441, 441R, 441G, 441B ... Liquid crystal panel (light modulation device), 5 ... Light source drive block (first cooling) (Target), 6 ... power supply block (second cooling target), 7 ... sirocco fan (fan), 71 ... first suction port, 72 ... second suction port, 73 ... discharge port, 8 ... sealing material (seal-like member) 932... First temperature determining unit 933. Second temperature determining unit 934. Third temperature determining unit 935. Shutter control unit (opening area control unit) 10. Shutter (opening area adjusting means), T. _{temperature, T 1, T 2, T} 3 ... the reference temperature.

Claims (4)

A light source, a light modulation device that modulates a light beam emitted from the light source according to image information to form an optical image, a projection optical device that magnifies and projects an optical image formed by the light modulation device, A projector comprising an exterior housing for housing the device,
A first cooling object and a second cooling object, which are housed in the exterior casing and generate heat according to the operating state of the projector,
A first suction port that is disposed between the first cooling target and the second cooling target and sucks air that has passed through the first cooling target; a second suction port that sucks air in the exterior housing; and A fan having a discharge port for discharging the sucked air to the second cooling target,
The projector according to claim 1, wherein the second suction port is provided with an opening area adjusting means for adjusting an opening area of the second suction port. The projector according to claim 1, wherein
The projector according to claim 1, wherein the opening area adjusting means is a sheet-like member that partially closes the second suction port. The projector according to claim 1, wherein
A temperature sensor for detecting a target temperature of at least one of the first cooling target and the second cooling target;
A temperature acquisition unit for acquiring the target temperature detected by the temperature sensor;
A temperature determination unit that determines whether the target temperature acquired by the temperature acquisition unit is equal to or higher than a predetermined temperature;
An opening area adjustment control unit configured to open the opening area of the second suction port by a predetermined amount when the temperature determination unit determines that the target temperature is equal to or higher than a predetermined temperature; Characteristic projector. In the projector according to any one of claims 1 to 3,
The first cooling target is a light source driving block that drives the light source,
The projector, wherein the second cooling target is a power supply block that supplies power to the light source and the light modulation device.

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