JP5268768B2 - Projection display - Google Patents

Description

  The present invention relates to cooling control of a projection display device.

  In a projection display device, when a discharge lamp is used as a lamp, the optimum temperature range for maintaining the discharge state is determined, and therefore the temperature must be kept constant. In general, the optimum temperature of the lamp is as high as several hundred degrees Celsius. If the temperature is too high at the time of lighting, an overload is applied and the life of the lamp is shortened. Therefore, cooling by an air cooling fan is performed at the time of lighting.

  If the user accidentally turns off the light (power off), it may be possible to immediately turn it on again (power on). Therefore, even after the lamp 11 that has become hot due to normal operation is turned off. Usually, it is air-cooled for a certain period of time with an air-cooling fan as in use. However, since it takes a certain time to sufficiently cool the lamp, the user cannot immediately relight the lamp, which results in inconvenience to the user.

  As an improvement measure for the above problem, for example, Patent Document 1 discloses a method of shortening the cooling time by increasing the rotational speed of the intake fan and the exhaust fan after the lights are turned off.

JP 2005-156750 A

  Although the cooling time of the lamp is shortened by the method of Patent Document 1, it is still insufficient for the immediate relighting required by the user.

  Therefore, an object of the present invention is to provide a projection display device that cools a lamp in a short period of time.

The projection display device of the present invention forms a lamp, a first air passage that passes through the lamp, a first air inlet that is an air inlet to the first air passage, and a first air that has cooled the lamp. A first air intake / exhaust means including a first air outlet that is an outlet from one air passage, and a second air passage that passes through the lamp only for a predetermined period after the lamp is extinguished, and air to the second air passage A second intake and exhaust means, and a second intake and exhaust means comprising: a second intake port that is an inlet of the second air outlet; and a second exhaust port that is an outlet from the second air passage of the air after cooling the lamp ; Control means for controlling the second intake / exhaust means, the second intake / exhaust means comprises a second intake port and an opening / closing means for opening and closing the second exhaust port driven by a motor, and the control means includes a motor The motor drive circuit to be driven and the second intake port and the second exhaust port are opened when the light is turned off, and are closed after a predetermined period has passed since the light was turned off. And a processing device for controlling the motor drive circuit. The lamp is cooled using the first intake / exhaust means during the normal time and during a predetermined period from the extinction, and the second intake / exhaust is performed only during the predetermined period after the extinction. The lamp is cooled by means.

The projection display apparatus of the present invention includes a second intake / exhaust unit that forms a second air passage that passes through the lamp only for a predetermined period after the lamp is extinguished, and the second intake / exhaust unit is configured to supply air to the second air passage. A second air inlet that is an inlet, and a second air outlet that is an outlet from the second air passage of the air after cooling the lamp. The projection display device of the present invention further includes control means for controlling the first intake / exhaust means and the second intake / exhaust means, and the second intake / exhaust means includes a second intake port and a second exhaust port driven by a motor. A motor drive opening / closing means that opens and closes the motor, and the control means drives the motor so that the motor drive circuit for driving the motor, the second intake port and the second exhaust port are opened when the light is turned off, and are closed after a predetermined period of time has elapsed And a processing device for controlling the circuit, wherein the lamp is cooled using the first intake / exhaust means during normal time and during a predetermined period from the extinction, and the second intake / exhaust means is used only during the predetermined period after the extinction. To cool the lamp. The lamp cooling period can be shortened by cooling the lamp by the second air path in addition to the first air path for a predetermined period after the lamp is extinguished.

It is a block diagram of the projection type display apparatus used as the premise of this invention. 1 is a configuration diagram of a projection display apparatus according to Embodiment 1. FIG. FIG. 3 is a configuration diagram of a movable part of the projection display apparatus according to the first embodiment. 1 is a block diagram illustrating a configuration of a projection display device according to a first embodiment.

(Embodiment 1)
<Prerequisite technology>
FIG. 1 is a schematic view showing an example of a lamp cooling structure of a projection display device as a prerequisite technology of the present invention. The projection display device includes a lamp 11, a normal intake fan 41, a normal exhaust fan, a color wheel 43, a projection lens 44, and a reflecting mirror 46.

  The light emitted by the discharge of the lamp 11 passes through the color wheel 43, is reflected by the reflecting mirror 46, and is output as projection light 45 from the projection lens 44.

  The normal-time intake fan 41 and the normal-time exhaust fan 42 are air-cooling mechanisms for keeping the temperature of the lamp 11 optimal. The normal-time intake fan 41 sends cooling air to the lamp 11, and the air that has passed through the lamp 11 is discharged as normal air exhaust fan 42 as waste air. However, this configuration cannot provide a sufficient cooling capacity.

  On the other hand, the projection display apparatus according to the present embodiment having improved cooling capacity will be described in detail below with reference to FIGS.

<Configuration>
FIG. 2 is a configuration diagram of a lamp cooling structure provided in the projection display apparatus according to the first embodiment. The projection display device includes a lamp 11 as a light source, and a first intake port 12 and a first exhaust port 13 as a first intake / exhaust unit that forms a first air path for cooling the lamp 11, and a normal intake fan 41. And a normal exhaust fan 42.

  The normal-time intake fan 41 and the normal-time exhaust fan 42 are air-cooling fans that operate during a predetermined period after the lamp 11 is turned on and after the lamp is turned off. The normal-time intake fan 41 causes cooling air to flow into the first air path, and the normal-time exhaust fan 42 discharges air heated through the lamp 11 from the first air path as waste air. However, only one of the normal-time intake fan 41 and the normal-time exhaust fan 42 may be provided.

  Furthermore, the projection display apparatus of Embodiment 1 uses the second intake port 16 and the second exhaust as second intake / exhaust means for forming a second air path for cooling the lamp 11 during a predetermined period after the lamp 11 is turned off. A port 17, an unlit exhaust fan 19, an unlit exhaust fan 20, and movable parts 14 and 15 are provided. The first air path and the second air path are constituted by the partition 18.

  The unlit intake fan 19 and unlit exhaust fan 20 are respectively provided in the second intake port 16 and the second exhaust port 17 and are driven for a predetermined period after the lamp 11 is turned off to cool the lamp 11 in the air. When the light is turned off, the intake fan 19 allows cooling air to flow into the second air passage through the second air inlet 16, and when the light is turned off, the exhaust fan 20 removes the waste air heated by the lamp 11 from the second air passage through the second air outlet 17. Discharge. However, only one of the intake fan 19 when turned off and the exhaust fan 20 when turned off may be provided.

  That is, the projection display apparatus according to Embodiment 1 includes the lamp 11, the first air intake / exhaust unit that forms the first air passage passing through the lamp 11 and air-cools the lamp 11, and the lamp 11 is turned off only for a predetermined period. And a second air intake / exhaust device that forms a second air passage through the lamp 11 and air-cools the lamp 11, wherein the first air intake / exhaust device is configured to supply air to the first air passage. A first air inlet 12 that is an inlet, and a first air outlet 13 that is an outlet from the first air passage of the air after cooling the lamp 11, and the second air intake / exhaust means includes a second air outlet A second air inlet 16 that is an air inlet to the road and a second air outlet 17 that is an air outlet from the second air path after cooling the lamp 11 are provided. The cooling period of the lamp 11 can be shortened by cooling the lamp 11 by the second air path in addition to the first air path for a predetermined period after the lamp 11 is turned off.

  Further, the first intake / exhaust means has a first intake fan (normal intake fan 41) that allows air to flow into the first air passage through the first intake port 12, and air from the first air passage through the first exhaust port 13. One or both of the first exhaust fans (normal exhaust fan 42) to be discharged are further provided, and the second intake / exhaust means is a second intake fan (in which air flows into the second air passage through the second intake port 16). It is further characterized by further comprising either or both of a non-exhaust intake fan 19) and a second exhaust fan (exhaust exhaust fan 20) that exhausts air from the second air passage through the second exhaust port 16. In addition to the first air path, the lamp 11 is cooled by the second air path by using the intake fan 19 and the exhaust fan 20 when the lamp is extinguished for a predetermined period after the lamp is extinguished. It can be shortened.

  The second intake port 16 and the second exhaust port 17 can be provided closer to the lamp 11 than the first intake port 12 and the first exhaust port 13. Normally, if light leaks from the air inlet or exhaust port, the light efficiency is lowered and the use of the projection display device is hindered. Therefore, these cannot be provided near the lamp 11, but the second air inlet 16 and Since the second exhaust port 17 is closed when the lamp 11 is lit, there is no problem even if it is provided near the lamp 11.

  However, the installation location of the second intake port 16, the second exhaust port 17, the dedicated intake fan 19 when turned off, and the exhaust fan 20 when turned off is not limited to the vicinity of the lamp 11, and cooling air for cooling the lamp 11 is provided. As long as the total amount per unit time is increased from the normal time, it may be provided at any location.

  The movable parts 14 and 15 are opening / closing means attached to the second intake port 16 and the second exhaust port 17, respectively. Although the configuration will be described later with reference to FIG. 3, the second air inlet 16 and the second exhaust 17 are opened only during a predetermined period when the lamp 11 is turned off, thereby forming the second air passage.

  That is, in the projection display apparatus of Embodiment 1, the second intake / exhaust means includes an opening / closing means (movable parts 14, 15) for opening and closing the second intake port 16 and the second exhaust port 17. . By opening the second intake port 16 and the second exhaust port 17 only during a predetermined period after the lamp 11 is extinguished, the total amount of cooling air of the lamp 11 per unit time can be increased and the cooling period of the lamp 11 can be shortened.

  FIG. 3 shows the configuration of the movable parts 14 and 15. The left side of FIG. 3 is the movable part 14, and the right side is the movable part 15. The middle figure is a plan view of the door, and the lower figure is a side view of the door. Since the movable parts 14 and 15 have the same configuration, the same components are given the same numbers, and only the configuration of the movable part 14 will be described below.

  The movable part 14 includes a motor 1, a motor side gear 2, a door side gear 3, a movable door 4, a DC power supply 5, a potentiometer 6, and a voltmeter 7.

  The motor side gear 2 is a gear that rotates as the motor 1 rotates. The door side gear 3 is a gear that slides as the motor side gear 2 rotates. The movable door 4 is a door that opens and closes by sliding the door-side gear 3. The potentiometer 6 measures the position of the movable door 4. The voltmeter 7 is connected to a potentiometer and measures a voltage interlocked with the position of the movable door 4.

  That is, the opening / closing means (movable parts 14, 15) is driven by the motor 1. Thus, the motor 1 can open and close the second intake port 16 and the second exhaust port 17 to control the formation of the second air path.

  Note that the shapes and opening / closing methods of the movable portions 14 and 15 are not limited to the contents disclosed in FIG. 3, and other shapes and opening / closing methods may be used. Moreover, the confirmation method of the opening / closing state of the movable door 4 is not limited to the configuration of the DC power source 5, the potentiometer 6, and the voltmeter 7 described above, and other confirmation methods may be used.

  Further, in the above description, both the off-time dedicated intake fan 19 and the unlit dedicated exhaust fan 20 are provided. However, even when only one of them is installed, the total amount of cooling air per unit time increases, so the cooling time The shortening effect is obtained.

  In addition, although only one set of the second intake port 16 and the second exhaust port 17 is provided as a pair of the intake port and the exhaust port that can be opened and closed, the present invention is not limited to this, and a set of the intake port and the exhaust port that opens when the light is extinguished. By providing a plurality, it is possible to further increase the total amount of cooling air per unit time and to shorten the cooling time.

<Operation>
Next, the operation of the projection display apparatus according to Embodiment 1 will be described. The operation of the cooling mechanism of the projection display device will be described with reference to FIG. When the lamp 11 is lit, the lamp 11 is cooled by the first air path formed by the first intake port 12 and the first exhaust port 13. More specifically, cooling air flows into the lamp 11 through the first air inlet 12 by the normal intake fan 41. The lamp 11 is cooled by the cooling air, and conversely, the cooling air is heated by the lamp 11 to become waste air. The waste air is discharged from the first air passage through the first exhaust port 13 by the normal exhaust fan 42.

  When the lamp 11 is turned off, in addition to the above cooling by the first air path, the movable parts 14 and 15 move to open the second intake port 16 and the second exhaust port 17 to cool the lamp 11. Two air paths are formed. At the same time, the intake fan 19 at the time of extinction and the exhaust fan 20 at the time of extinction are driven to send cooling air to the lamp 11. The cooling air is heated by the lamp 11 to become waste air, and the waste air is discharged from the second air path by the exhaust fan 20 when the light is turned off. Thereby, since the total amount per unit time of the cooling air of the lamp 11 increases compared with the normal time, the lamp 11 can be cooled in a short time.

  When the lamp 11 is sufficiently cooled, the intake fan 19 when extinguished and the exhaust fan 20 when extinguished are stopped, and the movable parts 14 and 15 close the movable door 4 and block the second air path.

  Next, the operation of the movable parts 14 and 15 will be described with reference to FIG. When the motor 1 is driven, the motor-side gear 2 rotates, and the door-side gear 3 meshed with the motor-side gear 2 slides as the motor-side gear 2 rotates, and the movable door 4 meshed with the door-side gear 3 opens. .

  The opening / closing state of the movable door 4 is confirmed by the voltage measured by the voltmeter 7 through the potentiometer 6. Thus, only when the lamp 11 is extinguished until the lamp 11 is sufficiently cooled, the movable doors 4 of the movable parts 14 and 15 can be opened to form the second air path for cooling the lamp 11. It becomes.

<Motor 1, fan control method when extinguished>
Next, the normal intake fan 41 and the normal exhaust fan 42 as the first intake / exhaust means, the unlit intake fan 19 and the unlit exhaust fan 20 and the movable parts 14 and 15 as the second intake / exhaust means are controlled. An example of the method will be described with reference to FIG.

  FIG. 4 is a block diagram illustrating an example of a configuration of a control unit that performs the above control. The control means includes a display device operation means 21, a microcomputer 22, a motor drive circuit 23, an AD converter 24, an unlit fan drive circuit 25, and a normal fan drive circuit 26.

  While the lamp 11 is lit, the microcomputer 22 sends a normal fan control signal to the normal fan drive circuit to drive the normal intake fan 41 and the normal exhaust fan 42. Thereby, during the lighting of the lamp 11, the lamp 11 is cooled by the first air path.

  If the display device operation means 21 is, for example, an operation key button of a projection display device, a turn-off instruction signal for turning off the lamp 11 is sent to the microcomputer 22 by an operation performed by the user. The microcomputer 22 that has received the turn-off instruction signal sends a motor control signal to the motor drive circuit 23 so that the motor 1 operates in the direction in which the movable door 4 opens. The motor drive circuit 23 sends motor drive power to the motor 1 to drive the motor 1. Thereby, the movable door 4 begins to open.

  The opening / closing state of the movable door 4 is grasped from the voltage value measured by the voltmeter 7. The voltage value is converted into a voltage value signal by the AD converter 24 and input to the microcomputer 22. The microcomputer 22 obtains the position of the movable door 4 based on the voltage value signal, and stops transmitting the motor control signal when it is confirmed that the movable door 4 is fully opened. As a result, the drive power to the motor 1 is stopped, the motor 1 is stopped, and the movable door 4 is stopped. Thus, the second intake port 19 and the second exhaust port 20 are opened, and a second air passage is formed in addition to the first air passage.

  After the movable door 4 is fully opened, the microcomputer 22 sends a fan control signal when the light is turned off to the fan drive circuit 25 when the light is turned off. The off-time fan drive circuit 25 that has received the off-time fan control signal sends fan-off power when the light is turned off to the intake fan 19 and the exhaust fan 20 when the light is turned off, and drives the intake fan 19 and the exhaust fan 20 when the light is turned off. To do.

  After a certain period of time has elapsed since the start of driving of the intake fan 19 and the exhaust fan 20 when the light is turned off, the microcomputer 22 sends a fan control signal when the light is turned off to the fan drive circuit 25 when the light is turned off. Stops the fan drive power when the lights are turned off to the intake fan 19 and the exhaust fan 20 when the lights are turned off. As a result, driving of the intake fan 19 when turned off and the exhaust fan 20 when turned off is stopped. At the same time, the microcomputer 22 sends a normal fan control signal to the normal fan drive circuit 26 so as to stop driving the normal intake fan 41 and the normal exhaust fan 42.

  After the driving of the intake fan 19 when turned off and the exhaust fan 20 when turned off, the microcomputer 22 sends a motor control signal to the motor drive circuit 23 so that the motor 1 operates in the direction in which the movable door 4 is closed. The motor drive circuit 23 receives the motor control signal and sends motor drive power to the motor 1. Thereby, the motor 1 is driven and the movable door 4 starts to close.

  The microcomputer 22 obtains the position of the movable door 4 from the voltage value signal from the AD converter 24, and stops the motor control signal when it is confirmed that the movable door 4 is completely closed. The motor drive circuit 23 stops the motor drive power to the motor 1, and the motor 1 stops.

  By the above control, the first air passage is formed when the lamp 11 is turned on, and the lamp 11 is cooled by the normal intake fan 41 and the normal exhaust fan 42. In a predetermined period from when the lamp 11 is turned off to when the lamp 11 is cooled, a second air path is formed in addition to the first air path, and the lamp 11 is also turned off by the intake fan 19 when turned off and the exhaust fan 20 when turned off. Can be cooled.

  That is, the projection display apparatus according to the first embodiment further includes control means for controlling the first intake / exhaust means and the second intake / exhaust means, and the control means includes a motor drive circuit 23 for driving the motor 1, and the first A first fan drive circuit (normal fan drive circuit 26) for driving the intake fan (normal intake fan 41) and the first exhaust fan (normal exhaust fan 42), and a second intake fan (intake-off intake fan 19) And a second fan driving circuit (an unlit fan driving circuit 25) for driving the second exhaust fan (unlit exhaust fan 20), and a normal intake fan 41 and a normal exhaust fan during a normal period and a predetermined period after the extinction. The fan drive circuit 26 in the normal state is controlled so that the motor 42 is driven, and the fan fan circuit in the unlit state is driven so that the intake fan 19 in the unlit state and the exhaust fan 20 in the unlit state are driven only during a predetermined period after the light is turned off. And a processing device (microcomputer) 22 that controls the motor drive circuit 23 so that the motor inlet circuit 16 is opened when the light is turned off and the exhaust port 17 is turned off when the light is turned off, and the motor driving circuit 23 is closed after a predetermined period has elapsed. Features. Thereby, it is possible to control the electronic circuit to form the second air path only for a predetermined period from the turn-off.

  Note that the control method of the motor 1, the non-exhaust intake fan 19 and the non-exhaust exhaust fan 20 is not limited to the above-described method, and any method can be used as long as the same effect can be obtained.

<Effect>
According to the projection display apparatus of the first embodiment, the following effects can be obtained as described above. That is, the projection display apparatus according to Embodiment 1 includes the lamp 11, the first air intake / exhaust unit that forms the first air passage passing through the lamp 11 and air-cools the lamp 11, and the lamp 11 is turned off only for a predetermined period. And a second air intake / exhaust device that forms a second air passage through the lamp 11 and air-cools the lamp 11, wherein the first air intake / exhaust device is configured to supply air to the first air passage. A first air inlet 12 that is an inlet, and a first air outlet 13 that is an outlet from the first air passage of the air after cooling the lamp 11, and the second air intake / exhaust means includes a second air outlet A second air inlet 16 that is an air inlet to the road and a second air outlet 17 that is an air outlet from the second air path after cooling the lamp 11 are provided. The cooling period of the lamp 11 can be shortened by cooling the lamp 11 by the second air path in addition to the first air path for a predetermined period after the lamp 11 is turned off.

  Further, the first intake / exhaust means has a first intake fan (normal intake fan 41) that allows air to flow into the first air passage through the first intake port 12, and air from the first air passage through the first exhaust port 13. One or both of the first exhaust fans (normal exhaust fan 42) to be discharged are further provided, and the second intake / exhaust means is a second intake fan (in which air flows into the second air passage through the second intake port 16). It is further characterized by further comprising either or both of a non-exhaust intake fan 19) and a second exhaust fan (exhaust exhaust fan 20) that exhausts air from the second air passage through the second exhaust port 16. In addition to the first air path, the lamp 11 is cooled by the second air path by using the intake fan 19 and the exhaust fan 20 when the lamp is extinguished for a predetermined period after the lamp is extinguished. It can be shortened.

  Further, the second intake port 16 and the second exhaust port 17 are provided closer to the lamp 11 than the first intake port 12 and the first exhaust port 13. Thereby, a cooling function can be improved.

  Further, the second intake / exhaust means includes an opening / closing means (movable portions 14 and 15) for opening and closing the second intake port 16 and the second exhaust port 17. By opening the second intake port 16 and the second exhaust port 17 only during a predetermined period after the lamp 11 is extinguished, the total amount of cooling air of the lamp 11 per unit time can be increased and the cooling period of the lamp 11 can be shortened.

  The opening / closing means (movable parts 14, 15) is driven by a motor 1. Thus, the motor 1 can open and close the second intake port 16 and the second exhaust port 17 to control the formation of the second air path.

  The projection display apparatus according to the first embodiment further includes control means for controlling the first intake / exhaust means and the second intake / exhaust means, and the control means includes a motor drive circuit 23 for driving the motor 1, A first fan drive circuit (normal fan drive circuit 26) for driving the intake fan (normal intake fan 41) and the first exhaust fan (normal exhaust fan 42), and a second intake fan (intake-off intake fan 19) And a second fan driving circuit (an unlit fan driving circuit 25) for driving the second exhaust fan (unlit exhaust fan 20), and a normal intake fan 41 and a normal exhaust fan during a normal period and a predetermined period after the extinction. The fan drive circuit 26 is controlled so that the motor 42 is driven, and the fan drive circuit 25 is turned off so that the fan fan 19 is turned off and the exhaust fan 20 is turned off during a predetermined period after the lamp is turned off. And a processing device (microcomputer) 22 that controls the motor drive circuit 23 so that the intake port 16 and the exhaust port 17 when the light is turned off are opened when the light is turned off, and are closed after a predetermined period has passed since the light is turned off. To do. Thereby, it is possible to control the electronic circuit to form the second air path only for a predetermined period from the turn-off.

  DESCRIPTION OF SYMBOLS 1 Motor, 2 Motor side gear, 3 Door side gear, 4 Movable door, 5 DC power supply, 6 Potentiometer, 7 Voltmeter, 11 Lamp, 12 1st inlet port, 13 1st exhaust port, 14, 15 Movable part, 16 2nd intake port, 17 2nd exhaust port, 19 Exhaust fan when turned off, 20 Exhaust fan when turned off, 21 Display device operating means, 22 Microcomputer, 23 Motor drive circuit, 24 AD converter, 25 Fan drive circuit when turned off, 26 Normal fan drive circuit, 41 Normal intake fan, 42 Normal exhaust fan, 43 Color wheel, 44 Projection lens.

Claims (3)

A lamp,
A first air inlet that forms a first air passage through the lamp, and is an air inlet to the first air passage; and an outlet from the first air passage that cools the lamp. A first exhaust port comprising: a first exhaust port;
A second air passage that passes through the lamp is formed only for a predetermined period after the lamp is turned off, a second air inlet that is an air inlet to the second air passage, and the air after cooling the lamp A second exhaust port that is a discharge port from the second air path;
Control means for controlling the first intake / exhaust means and the second intake / exhaust means,
The second intake / exhaust means includes an opening / closing means that opens and closes the second intake port and the second exhaust port, and is driven by a motor.
The control means controls the motor drive circuit that drives the motor and the motor drive circuit so that the second intake port and the second exhaust port are opened when the light is turned off, and are closed after a lapse of a predetermined period from the turn-off. A processing apparatus, wherein the lamp is cooled using the first intake / exhaust means at normal times and during a predetermined period from the extinguishing, and the second intake / exhaust means is disposed only during the predetermined period after the extinction. Use to cool the lamp,
Projection display device. The first intake / exhaust means includes:
A first intake fan for flowing air into the first air passage through the first intake port;
Either or both of a first exhaust fan that exhausts air from the first air path through the first exhaust port;
The second intake / exhaust means includes:
A second intake fan for flowing air into the second air passage through the second intake port;
The projection display device according to claim 1, further comprising one or both of a second exhaust fan that exhausts air from the second air passage through the second exhaust port.   The said 2nd inlet port and the said 2nd exhaust port are provided near the said lamp | ramp rather than the said 1st inlet port and the said 1st exhaust port, The Claim 1 or 2 characterized by the above-mentioned. Projection display device.

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