JP2011138054A - Projector and method for cooling lamp installed in the projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool a lamp installed in a projector capable of easily supplying an appropriate amount of air to the installed lamp even when at least one lamp is not installed among a plurality of installable lamps. Provide a method.
An air supply fan for supplying air to a plurality of lamps, a duct having an air supply port connected to the lamp on the other side and supplying air from the air supply fan to the lamp, and an air supply port And a shutter 160 that moves while contacting the lamp when the lamp is installed at or removed from the lighting position, and the shutter opens the air inlet when the lamp is installed at the lighting position. When the lamp is removed from the lighting position, the shutter is in the second mode in which the air supply port is closed compared to the first mode while the opening is provided in the air supply port. In the second mode, air from the air supply fan passes through the opening with substantially the same supply amount as in the first mode.
[Selection] Figure 9

Description

  The present invention relates to a projector and a method for cooling a lamp installed in the projector.

  A projector that is a display device that projects an image uses a high-intensity lamp as a light source and irradiates, for example, light transmitted through a liquid crystal panel onto a screen. Some projectors are called a two-lamp type having two lamps. In a two-lamp type projector, two lamps are turned on at the same time to increase the brightness, and usually only one lamp is turned on for use, and the other lamp is used as a spare. There is.

  Since the lamp built in the projector generates heat when it is turned on, the temperature of the lamp and the projector becomes high. Therefore, a cooling system such as an air supply fan or an exhaust fan is installed in the projector to cool the inside of the lamp and the projector.

  Patent Document 1 discloses a structure in which a plurality of lamp boxes are uniformly cooled by a single cooling fan. Further, Patent Document 2 discloses a structure for preventing glass scattering due to breakage of the lamp inside the projector.

JP 2004-219458 A JP 2005-196230 A

  Some projectors of the two-lamp switching type branch the cooling air from one air supply fan into two through a duct so that the two lamps can be cooled. By the way, as a method of using the two-lamp switching type projector, a spare lamp is installed inside the projector and two lamps are always installed, and as shown in FIG. 15, the spare lamp is installed. In some cases, only one lamp may be installed. FIG. 15 is an explanatory diagram showing a part of the inside of a conventional projector. FIG. 15 shows the lamp 16 connected to the duct 4 and the air supply fan 2 that blows cooling air to the lamp 16 through the duct 4. The lamp 16 has an air intake portion 14, the air intake portion 14 is connected to the duct 4, and cooling air is taken into the lamp 16.

  In a two-lamp switching type projector, if two lamps are installed, the resistance of the flow path becomes equal, so that cooling air is evenly supplied to the two lamps. On the other hand, when only one lamp is installed inside the projector, unlike FIG. 15, if there is no shutter 8, more cooling air flows through the space where the lamp is not installed. As a result, the cooling air to the lamp installed in the projector is reduced, the lamp temperature cannot be lowered, and the cooling condition is not satisfied.

  Therefore, as shown in FIG. 15, the shutter 8 is installed inside the duct 4 or the shutter is installed at the boundary between the light source holder and the duct as in Patent Document 1, so as to match the installation position of the lamp. It was necessary to open and close the air flow path. Alternatively, it is necessary to increase the flow rate to the lamp installed in the projector by increasing the output of the air supply fan without installing a shutter.

  Further, when the user manually opens / closes the shutter and switches the output of the air supply fan, the user must determine whether or not there is a lamp. At this time, if the user forgets to open / close the shutter or switch the output of the air supply fan, air may not be supplied to the lamp installation side at an appropriate flow rate, which may increase the lamp temperature.

  Therefore, as shown in FIG. 16, there is a method in which the sensor 30 electrically determines whether the lamp box 10 is installed in the lamp installation area 50. FIG. 16 is an explanatory diagram showing a cooling system of a conventional two-lamp switching type projector. The lamp box 10 containing the lamp is supplied with air by the air supply fan 2 and discharged by the exhaust fan 6, thereby cooling the lamp.

  When the shutter 8 is installed in the projector, the presence or absence of the lamp box 10 is determined by the sensor 30, and the position of the shutter 8 is moved by a signal from the control unit 20. Alternatively, when the shutter 8 is not installed, the presence or absence of the lamp box 10 is determined by the sensor 30, and the control unit 20 changes the output of the air supply fan 2. In these cases, it is necessary to construct a control system from detection of the presence or absence of a lamp to opening / closing control of the shutter 8 or output control of the air supply fan 2. In addition, when the output of the air supply fan 2 is increased to increase the flow rate to the lamp box 10 installed in the projector, there is a problem that the amount of rotation of the air supply fan 2 increases and the quietness is impaired. .

  In Patent Document 1, a shutter is installed in a projector, and the shutter is completely closed so that cooling air flows only through one lamp box. When the output of the cooling fan is not changed, it is described in Patent Document 1 that the flow rate increases and the lamp can be cooled strongly compared to the case where the cooling air is supplied to the two lamps, but depending on the output of the cooling fan, the lamp Too much cooling. As a result, problems such as a decrease in lamp brightness and blackening may occur. On the other hand, when the supply amount is reduced by changing the output of the cooling fan, it is necessary to switch the output of the cooling fan in addition to the opening / closing operation of the shutter.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a lamp that is installed even when at least one of the plurality of installable lamps is not installed. It is an object of the present invention to provide a new and improved projector and a method of cooling a lamp installed in the projector, which can easily supply an appropriate amount of air.

In order to solve the above-described problems, according to one aspect of the present invention, an air supply fan that supplies air to a plurality of lamps that are light sources, and one side that is connected to the air supply fan and branches according to the number of lamps The other side can be connected to the lamp, and at the connection part with the lamp, the duct having the air supply port for supplying air from the air supply fan to the lamp and the air supply port are provided, and the lamp is installed at the lighting position. And a shutter that moves while contacting the lamp when the lamp is removed from the lighting position, and when the lamp is installed at the lighting position, the shutter is in a first mode in which the air inlet is opened, In the first mode, air from the air supply fan passes through the air supply port and is supplied to the lamp, and when the lamp is removed from the lighting position, the shutter opens the air supply port while opening the air supply port. Compared to mode It is a second mode in which closed Te, the second mode of air from the air supply fan to pass through the opening with the same supply amount of the first mode, the projector is provided.
The “same” of the supply amount includes substantially the same and the same level.

  The output of the air supply fan may be the same in the first mode and the second mode.

In order to solve the above-described problem, according to another aspect of the present invention, when a lamp as a light source is installed at a lighting position, it is formed in a duct connected to an air supply fan that supplies air to the lamp. When the shutter provided at the air supply port moves while contacting the lamp and the lamp is installed at the lighting position, the shutter enters the first mode in which the air supply port is opened. Air from the air fan passes through the air supply port and is supplied to the lamp. When the lamp is removed from the lighting position, it moves while touching the lamp, and when the lamp is removed from the lighting position, the shutter is In the second mode, the air from the supply fan passes through the opening with the same supply amount as in the first mode. Set in the projector Ramp cooling method is provided.
The “same” of the supply amount includes substantially the same and the same level.

  As described above, according to the present invention, it is possible to easily supply an appropriate amount of air to the installed lamp even when at least one of the plurality of installable lamps is not installed.

1 is a perspective view showing a projector 100 according to a first embodiment of the present invention. 2 is a perspective view showing an air supply fan 102 and a lamp 116 according to the same embodiment. FIG. FIG. 3 is a perspective view showing an air supply fan 102 and a lamp installation area 150 according to the same embodiment. 4 is an explanatory diagram showing a cooling system of the projector 100 according to the embodiment. FIG. It is a side view which shows the shutter 160 which concerns on the same embodiment. It is a side view which shows the lamp box 110 and the duct 104. FIG. It is a side view which shows the lamp box 110 and the duct 104. FIG. It is a side view which shows the lamp box 110 and the duct 104. FIG. It is a perspective view which shows the lamp box 110 and the duct 104. FIG. It is a perspective view which shows the lamp box 110 and the duct 104. FIG. It is sectional drawing which shows the shutter 260 which concerns on the 2nd Embodiment of this invention. It is a side view which shows the lamp box 110 and the duct 104. FIG. It is a side view which shows the lamp box 110 and the duct 104. FIG. It is a side view which shows the lamp box 110 and the duct 104. FIG. It is explanatory drawing which shows a part of inside of the conventional projector. It is explanatory drawing which shows the cooling system of the conventional 2 light switch type projector.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

The description will be made in the following order.
1. First embodiment (projector having shutter 160 that rotates)
2. Second Embodiment (Projector having a sliding shutter 260)

<1. First Embodiment>
[Configuration of this embodiment]
First, the projector 100 according to the first embodiment of the present invention will be described. FIG. 1 is a perspective view showing a projector 100 according to the present embodiment. FIG. 1 schematically shows main internal components and the air supply fan 102 installed on the base 140 with the outer case of the projector 100 removed. FIG. 2 is a perspective view showing the air supply fan 102 and the lamp 116 according to the present embodiment. The lamp 116 shown in FIG. 2 is obtained by removing the outer case 113 of the lamp boxes 110A and 110B (hereinafter also collectively referred to as the lamp box 110) shown in FIG. FIG. 3 is a perspective view showing the air supply fan 102 and the lamp installation area 150 according to the present embodiment.

  The projector 100 is a display device that projects an image, and projects, for example, light transmitted through a liquid crystal panel onto a screen or the like using a high-intensity lamp 116 as a light source. The projector 100 is a two-lamp switching type and includes a lamp installation area 150 in which two lamp boxes 110A and 110B can be installed.

  There are two ways to use the two-lamp switching type projector 100. That is, when a spare lamp box 110A (or 110B) is installed inside the projector 100 and the two lamps 116 are always installed, the spare lamp 116 is not installed, and only one lamp 116 is installed. May be installed. FIG. 3 shows an example in which only the lamp box 110 </ b> B is installed in the lamp installation area 150.

  The projector 100 according to the present embodiment includes lamp boxes 110A and 110B, an illumination optical system 120, a projection optical system 130, an air supply fan 102, and the like.

  The lamp boxes 110A and 110B incorporate a lamp 116 as a light source of the projector 100 as shown in FIG. The lamp 116 is, for example, a xenon lamp or an ultra high pressure mercury lamp. The light emitted from the lamp 116 is output to the illumination optical system 120. The lamp boxes 110A and 110B of this embodiment are arranged in parallel so as to irradiate light in the same direction.

  The illumination optical system 120 once splits the light output from the lamp 116 into three primary colors (RGB). The illumination optical system 120 transmits the dispersed light to the liquid crystal panel to generate image light of each color, and then synthesizes the image light into one image light. The illumination optical system 120 outputs the combined image light to the projection optical system 130. The illumination optical system 120 includes a UV cut filter, a fly-eye lens, a mirror, a lens, a liquid crystal panel, a cross prism, and the like. The illumination optical system 120 can apply a normal technique, and detailed description thereof is omitted in this specification.

  The projection optical system 130 includes, for example, a projection lens, and projects the image light output from the illumination optical system 120 onto a screen or the like.

  Next, the cooling system of the projector 100 will be described with reference to FIGS. FIG. 4 is an explanatory diagram showing a cooling system of the projector 100 according to the present embodiment. The cooling system of the projector 100 includes, for example, an air supply fan 102, a duct 104, an exhaust fan 106, and the like.

  The air supply fan 102 is, for example, a centrifugal fan, and the air supply fan 102 supplies air to the lamp 116 and cools the lamp 116 that generates heat when it is lit. The supply fan 102 is connected to the duct 104. As shown in FIGS. 1 and 2, the projector 100 may be provided with two air supply fans 102 above and below. Thereby, the lamp 116 can be cooled from the upper side and the lower side of the lamp 116.

  The duct 104 is connected to the air supply fan 102 on one side, and is branched into two according to the number of the lamps 116 in the present embodiment. The duct 104 can be connected to the lamp 116 on the opposite side to the air supply fan 102. An air supply port 105 that supplies air from the air supply fan 102 to the lamp 116 is provided at the front end of the duct 104 that is a connection portion of the duct 104 with the lamp 116. The air supply port 105 is provided with a shutter 160.

  The exhaust fan 106 is, for example, an axial fan, and sucks air supplied to the lamp 116 and discharges the sucked air to the outside of the projector 100. The exhaust fan 106 is attached to the exterior case of the projector 100, for example.

  As shown in FIG. 2, the lamp 116 has an air intake 112 and an opening 114. The air intake portions 112 are respectively provided at the upper and lower portions of the lamp 116 and are connected to the duct 104. The installation position of the lamp box 110 when the air intake portion 112 and the duct 104 are connected is the lighting position when the lamp 116 is used by being lit. The air intake portion 112 is a cylindrical member, for example, and sends the air supplied from the duct 104 to the inside of the lamp 116. The opening 114 is provided on the side surface of the lamp 116 and discharges the air inside the lamp 116 to the outside. The opening 114 may be provided with a wire mesh that prevents glass from being scattered when the lamp 116 is broken.

  The lamp 116 is built in the outer case 113. As shown in FIGS. 1 and 3, the exterior case 113 is formed with a slit 111, and the slit 111 discharges air supplied to the lamp 116 to the outside of the lamp boxes 110A and 110B. The air discharged from the slit 111 is discharged outside the projector 100 by the exhaust fan 106.

  In the projector 100 according to this embodiment of the two-lamp switching type, as shown in FIGS. 1 and 2, if two lamps 116 are installed, the resistance of the flow path becomes equal, so that the cooling air is supplied to the two lamps. 116 evenly. The resistance of the flow path by the lamp 116 and the lamp box 110 is generated by the internal structure of the lamp 116, a wire mesh installed in the opening 114 of the lamp 116, the slit 111 of the lamp box 110, and the like.

  As shown in FIGS. 3 and 4, when only one lamp box 110 </ b> B is installed inside the projector 100, the shutter 160 serves as an obstacle corresponding to the flow path resistance of the lamp 116 or the lamp box 110 as will be described later. Function. In this embodiment, the flow path resistance is adjusted by the shutter 160 so that the air (A in FIG. 3) discharged from the air supply port 105 where the lamp 116 is not installed becomes equal to the air flowing through the lamp 116. . As a result, the cooling air is evenly supplied to both the air supply port 105 connected to the lamp 116 and the air supply port 105 where the lamp 116 is not installed. Therefore, even when the lamps 116 are installed on only one side, the same flow rate of air flows through the lamps 116 as when a plurality of lamps 116 are installed.

[Shutter 160]
Next, the shutter 160 according to the present embodiment will be described with reference to FIGS. FIG. 5 is a side view showing the shutter 160 according to the present embodiment. 6 to 8 are side views showing the lamp box 110 and the duct 104. 6 shows a state before the lamp box 110 is installed at the lighting position, FIG. 7 shows a process of installing the lamp box 110 at the lighting position, and FIG. 8 shows that the lamp box 110 is installed at the lighting position. The state that has been done. 9 and 10 are perspective views showing the lamp box 110 and the duct 104. FIG. FIG. 9 shows a state before the lamp box 110 is installed at the lighting position, and FIG. 10 shows a state where the lamp box 110 is installed at the lighting position.

First, the configuration of the shutter 160 will be described.
The shutter 160 includes a plate-like member 162, a shaft member 164, a protruding member 166, and the like. The plate member 162 is, for example, a flat plate member. One end of the plate-like member 162 is connected to the duct 104 via the shaft member 164, and is rotatable about the shaft member 164. The plate-like member 162 makes the air supply port 105 open (first mode), or makes the air supply port 105 semi-closed (second mode). The shaft member 164 is provided with a torsion spring, for example, and the plate-like member 162 is urged in a direction to close the air supply port 105 by the torsion spring.

  The protruding member 166 is provided on one surface of the plate-like member 162, for example, the surface facing the air supply port 105. When the plate-like member 162 places the air supply port 105 in a semi-closed state (second mode), the projecting member 166 contacts the tip portion of the duct 104 and the plate-like member 162 completely closes the air supply port 105. Do not. The opening formed by the protruding member 166 has an opening area determined so that the air flow rate in the open state (first mode) of the air supply port 105 is the same as the air flow rate in the semi-closed state (second mode). The

  The opening area of the opening formed by the protruding member 166 can be determined by measuring the flow rate in the duct 104 of the projector 100. Alternatively, the temperature change of the lamp 116 when air is actually supplied from the air supply fan 102 and all the plurality of lamp boxes 110 are attached, and one of the plurality of lamp boxes 110 is removed and the rest is attached. It is also possible to determine by comparing the temperature change of the lamp 116 at the time.

Next, the operation of the shutter 160 will be described.
First, before the lamp box 110 is installed at the lighting position, as shown in FIGS. 6 and 9, the shutter 160 places the air supply port 105 in a partially closed state (second mode).

  In the process of installing the lamp box 110 at the lighting position, the shutter 160 rotates while the air intake portion 112 of the lamp 116 contacts the shutter 160 as shown in FIG. That is, the shutter 160 is pushed open while the lamp box 110 is mounted on the projector 100.

  Thereafter, in a state where the lamp box 110 is installed at the lighting position, as shown in FIGS. 8 and 10, the air intake portion 112 of the lamp 116 is connected to the air supply port 105, and the shutter 160 connects the air supply port 105. Set to open (first mode).

  On the contrary, in the process in which the lamp box 110 is removed from the lighting position, the shutter 160 rotates while the air intake portion 112 of the lamp 116 contacts the shutter 160 as shown in FIG. That is, the shutter 160 is closed while the lamp box 110 is removed from the projector 100.

  After the lamp box 110 is removed from the lighting position, as shown in FIGS. 6 and 9, the shutter 160 brings the air supply port 105 into a partially closed state (second mode).

  As described above, in the present embodiment, the shutter 160 mechanically contacts the lamp box 110, and the shutter 160 opens and closes in conjunction with the insertion or removal operation of the lamp box 110. Accordingly, the present embodiment does not require electrical detection of the presence or absence of the lamp box 10 by the sensor 30 as described above with reference to FIG. 16, and relates to the opening / closing control of the shutter 8 and the output control of the air supply fan 2. There is no need to construct a control system. Since the shutter 160 opens and closes with a simple structure, there is no risk of malfunction.

  Further, in the present embodiment, when the lamp box 110 is removed from the lighting position, the air supply port 105 is provided with an opening, and is in a closed state as compared to when the lamp box 110 is installed. At this time, the air from the air supply fan 102 passes through the opening with substantially the same supply amount as when the lamp box 110 is installed. That is, when the lamp box 110 is not installed, the shutter 160 is not a complete obstruction, but functions as an obstacle corresponding to the flow path resistance of the lamp 116 and the lamp box 110. As a result, air of the same flow rate as when a plurality of lamps 116 are installed flows through the lamp 116 installed only on one side without increasing the output of the air supply fan 102, so that the lamp 116 is appropriately cooled. be able to.

  In addition, since the air supply port 105 is not completely shielded, the air flow rate does not increase in the lamp 116 installed only on one side, so that the lamp 116 is cooled excessively and the brightness of the lamp 116 is lowered. Nor the problem of promoting blackening. Furthermore, since it is not necessary to increase the rotation amount by increasing the fan voltage of the air supply fan 102, the lamp 116 can be cooled without impairing silence.

<2. Second Embodiment>
Next, a projector according to a second embodiment of the invention will be described. FIG. 11 is a cross-sectional view showing the shutter 260 according to this embodiment. 12 to 14 are side views showing the lamp box 110 and the duct 104. FIG. 12 shows a state before the lamp box 110 is installed at the lighting position, FIG. 13 shows a process of installing the lamp box 110 at the lighting position, and FIG. 14 shows that the lamp box 110 is installed at the lighting position. The state that has been done.

  In the present embodiment, the configurations of the lamp boxes 110A and 110B, the illumination optical system 120, the projection optical system 130, the air supply fan 102, and the duct 104 are the same as those in the first embodiment described above. These descriptions are omitted. Since this embodiment differs from the first embodiment in the shutter 260 provided at the air inlet 105 of the duct 104, the shutter 260 will be described below.

First, the configuration of the shutter 260 will be described.
The shutter 260 includes a plate-like member 262, a protruding member 264, an elastic member 266, and the like. The plate-like member 262 is, for example, a plate-like member, and can slide the tip of the duct 104 provided with the air supply port 105. The plate-like member 262 makes the air supply port 105 open (first mode), or makes the air supply port 105 semi-closed (second mode). The plate-like member 262 has a protrusion 263, and the protrusion 263 is connected to the duct 104 via the elastic member 266.

  The protruding member 264 is provided at one end of the plate-like member 262 in a direction protruding from the duct 104 to the outside. The protruding member 264 can contact the air intake portion 112 of the lamp box 110. The elastic member 266 urges the plate-like member 262 in a direction to close the air supply port 105.

  When the plate-like member 262 places the air supply port 105 in a semi-closed state (second mode), the plate-like member 262 biased by the elastic member 266 has the projection 263 in contact with the contact portion 268 and the plate The shaped member 262 prevents the air supply port 105 from being completely blocked. The opening formed by the plate-like member 262 partially closing the air supply port 105 includes an air flow rate in the open state (first mode) of the air supply port 105 and an air flow rate in the semi-closed state (second mode). Are determined to be the same.

  The opening area of the opening formed by the plate-like member 262 partially closing the air supply port 105 can be determined by measuring the flow rate in the duct 104 of the projector 100. Alternatively, the temperature change of the lamp 116 when air is actually supplied from the air supply fan 102 and all the plurality of lamp boxes 110 are attached, and one of the plurality of lamp boxes 110 is removed and the rest is attached. It is also possible to determine by comparing the temperature change of the lamp 116 at the time.

Next, the operation of the shutter 260 will be described.
First, before the lamp box 110 is installed at the lighting position, as shown in FIG. 12, the shutter 260 is in a state (second mode) in which the air supply port 105 is partially closed.

  In the process of installing the lamp box 110 at the lighting position, the shutter 260 slides while the air intake portion 112 of the lamp 116 contacts the shutter 260 as shown in FIG. That is, the shutter 260 is pushed open while the lamp box 110 is mounted on the projector.

  After that, in a state where the lamp box 110 is installed at the lighting position, as shown in FIG. 14, the air intake portion 112 of the lamp 116 is connected to the air supply port 105, and the shutter 260 opens the air supply port 105 ( 1st mode).

  On the contrary, in the process of removing the lamp box 110 from the lighting position, the shutter 260 slides while the air intake portion 112 of the lamp 116 contacts the shutter 260 as shown in FIG. That is, the shutter 260 is closed while the lamp box 110 is removed from the projector.

  After the lamp box 110 is removed from the lighting position, as shown in FIG. 12, the shutter 260 places the air inlet 105 in a partially closed state (second mode).

  As described above, in this embodiment, the shutter 260 mechanically contacts the lamp box 110, and the shutter 260 opens and closes in conjunction with the insertion or removal operation of the lamp box 110. Accordingly, the present embodiment does not require electrical detection of the presence or absence of the lamp box 10 by the sensor 30 as described above with reference to FIG. 16, and relates to the opening / closing control of the shutter 8 and the output control of the air supply fan 2. There is no need to construct a control system. Since the shutter 260 opens and closes with a simple structure, there is no risk of malfunction.

  Further, in the present embodiment, when the lamp box 110 is removed from the lighting position, the air supply port 105 is provided with an opening, and is in a closed state as compared to when the lamp box 110 is installed. At this time, the air from the air supply fan 102 passes through the opening with substantially the same supply amount as when the lamp box 110 is installed. That is, when the lamp box 110 is not installed, the shutter 260 functions as an obstacle corresponding to the flow path resistance of the lamp box 110 rather than a complete shield. As a result, air of the same flow rate as when a plurality of lamps 116 are installed flows through the lamp 116 installed only on one side without increasing the output of the air supply fan 102, so that the lamp 116 is appropriately cooled. be able to.

  In addition, since the air supply port 105 is not completely shielded, the air flow rate does not increase in the lamp 116 installed only on one side, so that the lamp 116 is cooled excessively and the brightness of the lamp 116 is lowered. Nor the problem of promoting blackening. Furthermore, since it is not necessary to increase the rotation amount by increasing the fan voltage of the air supply fan 102, the lamp 116 can be cooled without impairing silence.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  For example, in the above embodiment, the case where two lamp boxes and lamps are installed in the projector has been described. However, the present invention is not limited to this example, and the case where three or more lamp boxes and lamps are installed in the projector. Is the same.

2 Air supply fan 4 Duct 8 Shutter 6 Exhaust fan 10 Lamp box 14 Air intake unit 16 Lamp 20 Control unit 30 Sensor 50 Lamp installation area 100 Projector 102 Air supply fan 104 Duct 105 Air supply port 106 Exhaust fan 110, 110A, 110B Lamp Box 111 Slit 112 Air intake part 113 Exterior case 114 Opening part 116 Lamp 120 Illumination optical system 130 Projection optical system 150 Lamp installation area 160, 260 Shutter 162 Plate member 164 Shaft member 166 Projection member 262 Plate member 263 Projection 264 Projection Member 266 Elastic member 268 Contact part

Claims (3)

An air supply fan for supplying air to a plurality of lamps as light sources;
Connected to the air supply fan on one side, branched according to the number of the lamps, and connectable to the lamps on the other side, and the air is supplied from the air supply fan to the lamps at a connection portion with the lamps. A duct having an air supply port to supply to,
A shutter that is provided in the air supply port and moves while contacting the lamp when the lamp is installed at a lighting position or when the lamp is removed from the lighting position;
When the lamp is installed at the lighting position, the shutter is in a first mode in which the air supply port is opened. In the first mode, air from the air supply fan passes through the air supply port. Is supplied to the lamp,
When the lamp is removed from the lighting position, the shutter is in a second mode in which the air supply port is closed compared to the first mode while an opening is provided in the air supply port. A projector in which air from the air supply fan passes through the opening in the second mode with the same supply amount as in the first mode.   The projector according to claim 1, wherein an output of the air supply fan is the same in the first mode and the second mode. When a lamp as a light source is installed at a lighting position, a shutter provided in an air supply port formed in a duct connected to an air supply fan that supplies air to the lamp moves while contacting the lamp,
When the lamp is installed at the lighting position, the shutter enters the first mode in which the air supply port is opened, and air from the air supply fan passes through the air supply port in the first mode. Is supplied to the lamp,
When the lamp is removed from the lighting position, it moves in contact with the lamp,
When the lamp is removed from the lighting position, the shutter enters the second mode in which the air supply port is closed compared to the first mode while providing an opening in the air supply port. A cooling method for a lamp installed in a projector, wherein in the mode, air from the air supply fan passes through the opening with the same supply amount as in the first mode.

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