JP2005049464A - Projection display device and its light source cooling control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To overcome the problem that a user must stand by until power supply is actually stopped in order to confirm safety for the cooling of a light source because the power supply is not stopped for a given time because of need to cool a lamp which is turned off by a fan after the power supply switch of a main body is turned off in the conventional projection type display device. <P>SOLUTION: When the power supply switch of the projection display device installed in a conference room is turned off (S301), the power supply for the light source is turned off so as to start cooling (S302 and S303), and temperature near the light source is detected after the specified time elapses (S304 and S305). When the temperature is equal to or under a given value (S306), a message that operation is normally finished is transmitted to a user address (S307). Otherwise, a message that the operation is abnormally finished is transmitted to the user and the manager of the conference room (S310). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection display device that performs display by irradiating a light modulation element with light from a light source and projecting the reflected or transmitted light through a projection lens, and more particularly to cooling control for the light source and its surroundings.
[0002]
[Prior art]
In recent years, with the widespread use of personal computers (PCs), the opportunity to use projection display devices, that is, projectors, as presentation devices in conferences and the like is increasing. Projectors are classified according to the projection method into a front projector that projects from the front of the screen and a rear projector that projects from the back of the screen.
[0003]
In general, a projector forms an image by irradiating a light modulation element such as an LCD or DMD with a light source and projecting light transmitted or reflected from the light modulation element through a projection lens. As these light sources, a high-pressure mercury lamp or the like is used. In order to ensure the reliability of the lamp, it is necessary to use it while sufficiently cooling it with a cooling fan. Also, when the projector is turned off, it is necessary to cool the light source sufficiently.
[0004]
Therefore, as a fan cooling control method for cooling a light source in a conventional projector, a method of operating a cooling fan unconditionally while the projector lamp is lit, or cooling for a certain period after the projector lamp is turned off. A method of operating a fan or a combination thereof is known. In addition, the inventor does not know the literature regarding said technique.
[0005]
[Problems to be solved by the invention]
However, in order to ensure the reliability of the lamp and peripheral devices, it is necessary to cool by the fan until the lamp temperature decreases after the lamp is turned off even after the projector power switch (SW) is turned off. . The cooling period after the power SW is turned off is often about 3 to 5 minutes. Therefore, for example, when turning off the power of the projector used in the meeting after the meeting is over, the user has to wait for the predetermined time until the power is actually turned off for safety confirmation, and cannot exit. .
[0006]
The present invention has been made to solve the above-described problems, and it is intended to facilitate safety confirmation with respect to light source cooling at the end of use of a projection display device and reduce the waiting time of a user until the power is turned off. To do.
[0007]
[Means for Solving the Problems]
As a technique for achieving the above object, the present invention includes the following steps.
[0008]
That is, a projection display unit that performs display by irradiating light from a light source onto a light modulation element and projecting reflected or transmitted light through a projection lens, a cooling unit that cools the light source, and a power supply for the entire apparatus A power switch means for instructing to turn off; a light source switch means for turning off the power source for the light source in response to a power-off instruction by the switch means; and a communication means for sending and receiving e-mails over a network. A light source cooling control method in a projection display device, wherein a time measuring step of measuring an elapsed time after power-off for a light source by the light source switch means, a temperature detecting step of detecting a temperature in the vicinity of the light source, and the progress And a transmission step of transmitting a predetermined message to a predetermined destination by the communication means according to the time and the detected temperature.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment according to the present invention will be described in detail with reference to the drawings.
[0010]
<First Embodiment>
In the present embodiment, when the power of the projection display device (hereinafter referred to as a projector) used in the conference is turned off after the conference is finished, the need for the user to wait on the spot for safety confirmation has been reduced. It is characterized by.
[0011]
FIG. 1 is a diagram showing a configuration of a projection display device (hereinafter referred to as a projector) D1 according to the present embodiment. In the present embodiment, three liquid crystal panels 2R, 2G, and 2B corresponding to R, G, and B color displays are used as the light modulation elements, and the three liquid crystal panels 2R, 2G, and 2B are opposed to the cross prism 7. To place. In the present embodiment, TN liquid crystal panels that are driven using TFTs are used as the liquid crystal panels 2R, 2G, and 2B. Further, polarizing plates 8 are arranged on both sides of the liquid crystal panels 2R, 2G, and 2B, and a projection lens 9 and a screen (projected member) 6 are arranged on the light emission side of the cross prism 7. .
[0012]
Further, by arranging a parabolic reflector 10 so as to surround the lamp (light source) 1, the emitted light from the lamp 1 is converted into a parallel light flux. The reflector 10 is not limited to a parabolic type but may be converted into a condensed light beam as an elliptical type. As the lamp 1, a metal halide lamp, a xenon lamp, or the like can be used.
[0013]
Further, the fly-eye integrators 40 and 41 are arranged on the optical path of the light emitted from the lamp 1 and have a conjugate relationship with the liquid crystal panels 2R, 2G, and 2B, thereby improving the non-uniformity of the light source. .
[0014]
A relay lens 11 and a mirror 12 are arranged in this order on the light emission side of the fly-eye integrators 40 and 41. Further, two dichroic mirrors 13 and 14 are arranged, the light emitted from the lamp 1 is branched into three, and relay lenses 15 and mirrors 16, 17 and 18 are arranged to arrange the liquid crystal panels 2R, 2G and 2B. Lead to. Reference numeral 19 denotes a field lens.
[0015]
The lamp 1 is connected to a ballast 57 for supplying power for the lamp, and a temperature sensor 101 and a cooling fan 102 are disposed in the vicinity of the lamp 1.
[0016]
FIG. 2 is a block diagram illustrating a functional configuration of the control unit 200 in the projector D1. As shown in the figure, the liquid crystal panels 2R, 2G, and 2B are connected to the video signal input unit 3 and the like, the CPU 63 is connected to the temperature sensor 101, and the fan control unit 110 is connected to the cooling fan 102. . In addition, a power source 58 and a ballast controller 109 are connected to the ballast 57.
[0017]
In the video signal input unit 3, reference numeral 30 denotes a switch, and 31 denotes an A / D converter. 32 is a DSP unit, 33 is a memory for holding current display data and data to be displayed in the next frame, 34 is a timing generation circuit (TG), 35 is a D / A converter, and 36 is applied to each liquid crystal panel. 1 shows a signal to be transmitted and a driver circuit for supplying power.
[0018]
Reference numeral 50 denotes a PC input terminal, and 51 denotes an NTSC input terminal. Although only an analog input signal is shown in FIG. 2, the present invention is not limited to this, and it goes without saying that it is effective to provide an input terminal for LVSD, TMDS, etc., or a D3 terminal for digital TV. .
[0019]
A signal processing circuit 52 performs signal processing such as NTSC signal decoding, noise reduction processing, band-limiting filtering, and signal level adjustment. Reference numeral 53 is an audio input terminal, 54 is an audio selector switch, 55 is an audio processing circuit (AMP), and 56 is a speaker. Reference numeral 57 denotes a ballast which is a lamp power supply connected to the lamp 1, 58 denotes a system power supply, 59 denotes a standby power supply, and 60 denotes an AC inlet. Reference numeral 61 denotes a remote controller for performing various operations in the projector, and 62 denotes a control panel for receiving signals from the remote controller 61.
[0020]
Reference numeral 63 denotes a CPU, 64 denotes a ROM, and 65 denotes a RAM. The CPU 63 is connected to the video signal input unit 3, the control panel 62, the ballast control unit 109, the temperature sensor 101, the cooling fan control unit 110, the power supply SW detection unit 107, the timer 104, the communication control unit 105, and the like. Further, drive control of the liquid crystal panels 2R, 2G, 2B, the lamp 1, etc., mail transmission / reception control, light source cooling control, and the like are performed. Furthermore, 107 is a power SW detection unit, 108 is a system power control unit, 109 is a ballast control unit, and 110 is a fan control unit.
[0021]
111 is a conference information storage unit, 112 is an e-mail software storage unit, 114 is a mail software control unit, 115 is an opening confirmation request adding unit, 116 is a mail transmission text storage unit, 117 is a mail decoding unit, and 118 is a mail reception A detection unit, 121 is a display control unit, 122 is a conference information acquisition control unit, and 123 is a display message storage unit. The communication control unit 105 is connected to the LAN 201 via the communication I / F 106 and acquires conference information described later from the conference management server 202.
[0022]
Note that the DSP unit 32 performs display image processing such as contrast, brightness adjustment, and resolution conversion.
[0023]
In the present embodiment, the timer 104, the communication control unit 105, the communication I / F 106, the power SW detection unit 107, the system power control unit 108, the ballast control unit 109, the fan control unit 110, the conference information storage unit 111, e-mail software Storage unit 112, mail software control unit 114, opening confirmation request addition unit 115, mail transmission text storage unit 116, mail decryption unit 117, mail reception detection unit 118, display control unit 121, conference information acquisition control unit 122, display message storage Although the section 123 and the like have been described as being connected to the CPU 63, these may be built in the CPU 63 or executed by a program.
[0024]
Hereinafter, the operation in this embodiment will be described with reference to FIG.
[0025]
In a state where the AC inlet 60 of the control unit 200 is connected to an AC power source (not shown), power is supplied from the standby power source 59 to the main control unit 120. The main control unit 120 includes a power supply SW 103, a power supply SW detection unit 107, a CPU 63, a ROM 64, and a RAM 65. The power supply is supplied from the standby power supply 59 even when the power supply SW 103 is off, and is in an operable state.
[0026]
Here, for example, at the start of the conference, when the power SW 103 is turned on to use the projector D1, the power SW detection unit 107 detects that effect. When it is detected that the power supply SW 103 is turned on, the system power supply control unit 108 turns on the system power supply 58 and supplies power to the entire control unit 200 of the projector D1. In addition, the ballast control unit 109 turns on the ballast 57 that is a lamp power supply and supplies power to the lamp 1. The CPU 63 performs various settings for the video signal processing unit 3 by the display control unit 121, thereby displaying video input from the PC input terminal 50 and NTSC input terminal 51, and input from the audio input terminal 53 and the like. Audio is output.
[0027]
The projector D1 in this embodiment is connected to the conference management server 202 on the LAN 201 via the communication I / F 106. The conference information acquisition control unit 122 in the control unit 200 acquires conference information described later from the conference management server 202. Here, the communication control unit 105 controls a communication protocol such as TCP / IP, and the communication I / F 106 includes a communication I / F such as 10Base-T.
[0028]
In the conference management server 202, the manager name is registered for each conference room as conference information. For example, when a conference room is reserved, the reservation person connects the LAN 201 or the like to the conference management server 202 from an individual PC (not shown). And enter the reservation target meeting room, use start / end time, e-mail address of the reservation person, and the like. The light source cooling control when the projector D1 is turned off in the present embodiment is performed based on the conference information registered in the conference management server 202.
[0029]
Here, FIG. 4 shows an example of the conference information 400 registered in the conference management server 202. The conference information 400 includes a conference room name 401, an administrator name 402, an administrator mail address 403, a current date 404, a current time 405, a reservation person name 406, a reservation person mail address 407, a reservation date 408, and a reservation. A start time 409 and a reservation end time 410 are stored. The conference information 400 is stored in the conference management server 202, and reservation management for each conference room is performed.
[0030]
Hereinafter, control in the present embodiment when the projector D1 is used in a certain meeting will be described.
[0031]
First, with reference to FIG. 5, the operation of acquiring the conference information 400 in the projector D1 of the present embodiment will be described.
[0032]
When the power SW detection unit 107 detects that the power SW 103 is pressed at the start of the conference (S501), the CPU 63 acquires the conference information 400 from the conference server 202 to the communication control unit 105 by the conference information acquisition control unit 122. Is instructed to do so (S502). The communication control unit 105 acquires the conference information 400 from the conference server 202 according to the command of the conference information acquisition control unit 122 (S503), and stores the conference information 400 in the conference information storage unit 111 connected to the CPU 63 (S504). . After acquiring the conference information 400, the communication control unit 105 disconnects the communication connected to the conference server 202 via the communication I / F 106 (S505).
[0033]
The conference information 400 stored in the conference information storage unit 111 includes e-mail addresses 403 and 407 of the reservation person and the administrator. In this embodiment, light source cooling control is performed using these e-mail addresses. It is characterized by.
[0034]
Although an example in which the conference information 400 is acquired from the projector D1 side has been described here, the conference reservation server may transmit the conference information 400 to the projector D1.
[0035]
Hereinafter, the light source cooling control when the power is turned off in the present embodiment will be described with reference to the flowchart of FIG.
[0036]
In the conference in which the conference information 400 is acquired as described above, the cooling fan 102 operates while the projector D1 is powered on, thereby cooling the periphery of the lamp 1 and the power source 57.
[0037]
For example, when the power SW detection unit 107 detects that the power source SW 103 instructs to turn off the projector D1 after the conference ends (S301), the CPU 63 instructs the ballast control unit 109 from the ballast 57 to the lamp 1. The stop of power supply is instructed (S302), and the lamp 1 is turned off. Then, the fan control unit 110 increases the rotation speed of the cooling fan 102 and increases the cooling capacity (S303).
[0038]
Next, the elapsed time after turning off the ballast 57 is measured by the timer 104, and when 5 minutes have passed (S304), the temperature sensor 101 determines whether the ambient temperature of the lamp 1 is 40 ° C. or less. Confirm (S305). If it is 40 ° C. or lower (S 306), the mail software control unit 114 activates the mail software stored in the e-mail software storage unit 112 and sends a mail to the e-mail address of the reservation person stored in the conference information storage unit 111. A message “Projector has finished normally” stored in the sentence storage unit 116 is transmitted by e-mail (S307), the mail software control unit 114 terminates the mail software, and then the fan control unit 110 cools it. The fan 102 is stopped (S308). Then, the system power supply control unit 108 turns off the system power supply 58 of the projector D1 (S309).
[0039]
On the other hand, when the lamp ambient temperature is not 40 ° C. or less (S306), the mail software control unit 114 activates the mail software stored in the e-mail software storage unit 112 and then stores the mail software in the conference information storage unit 111. The message “Projector has ended abnormally” stored in the mail transmission text storage unit 116 is transmitted by e-mail to the mail addresses of the reservation person and the manager (S310). At that time, an opening confirmation request adding unit 115 adds an opening confirmation request to the electronic mail.
[0040]
Then, when a notification of opening confirmation is returned from the administrator or the reservation person who has received the mail and the mail reception detecting unit 118 detects that the mail has been received, the address of the mail sent by the mail decoding unit 117 is the conference information. If the address of the administrator or the reservation person is the same as that of the administrator or the reservation person stored in the storage unit 111, it is determined that the opening confirmation notification is received from the reservation person or the administrator. (S311). Then, in a state where the cooling fan 102 is rotated by the fan control unit 110, it waits until an action by the reservation person or the manager is obtained.
[0041]
Here, if the opening confirmation notification is not received even after 30 minutes have elapsed due to the measurement of the timer 104 (S311), an alarm sound is generated from the speaker 56 by instructing the AMP 55 from the alarm generation unit 119 (S312). ).
[0042]
In the case of abnormal termination (after S310), the cooling fan 102 may be stopped and the system power supply 58 may be turned off before waiting for a response from the reservation person or administrator.
[0043]
As described above, according to the present embodiment, the lamp is turned off, the power supply and the fan are controlled, and the notification by e-mail is optimally controlled. Therefore, after the use of the projector D1, the user waits in the conference room. There is no need to be.
[0044]
In addition, when an abnormality such as the lamp not turning off occurs, a notification email is sent not only to the conference room reservation person but also to the conference room manager, and even if the notification email is not received, an alarm is generated. Will generate a warning, thus ensuring safety.
[0045]
In addition, since the e-mail addresses of the reservation person and the administrator are acquired from the meeting management server 202, it becomes possible to centrally manage the meeting information, and it is not necessary to register the e-mail address for each meeting. Can be used.
[0046]
Second Embodiment
Hereinafter, a second embodiment according to the present invention will be described. Since the configuration and operation of the projector in the second embodiment are the same as those in the first embodiment described above, detailed description thereof is omitted here.
[0047]
The second embodiment is characterized in that even if the conference reservation person forgets to turn off the power SW 103 of the projector D1 in the first embodiment described above, safe lamp cooling control is realized. . Hereinafter, the light source cooling control in the second embodiment will be described with reference to the flowchart of FIG.
[0048]
As in the first embodiment, when the power SW 103 of the projector D1 is turned on at the start of the conference and the system power 58 is supplied, the conference information is connected to the conference reservation server 202 via the communication I / F 106 (S601). 400 is acquired and stored in the conference information storage unit 111 (S602). Here, as shown in FIG. 4, the conference information 400 includes a reservation end time 410, and the second embodiment is characterized in that light source cooling control is performed using this.
[0049]
When the timer 104 detects that the reservation end time 410 is five minutes before the reservation end time 410 (S603), the display message storage unit 123 displays a message stating that “the reservation will end in five minutes”. The data is read and displayed on the panels 2R, 2G, and 2B via the signal processing unit 3 by the display control unit 121. Display messages by the panels 2R, 2G, and 2B are displayed on the screen 6 through the projection lens 9 (S604).
[0050]
When it is confirmed by the timer 104 that the conference reservation end time 410 has been reached (S605), a message stating that “the end time has been reached” is read from the display message storage unit 123 and displayed on the screen 6 at the same time. The next conference information 400 is acquired from the server 202, and it is confirmed whether or not there are conference reservations continuous in time (S606). If there is a reservation, the power supply 58 of the projector 200 is turned on as it is (S607), but if there is no reservation, a message stating “The lamp is turned off after 5 minutes” is read from the display message storage unit 123. Is displayed on the screen 6 (S608). When 5 minutes have elapsed (S609), a message indicating that the lamp is turned off is displayed, and then the ballast controller 109 turns off the ballast 57, which is a power source for the lamp (S610).
[0051]
Thereafter, similarly to the first embodiment described above, the fan is controlled and the system power is turned off according to the temperature in the vicinity of the lamp (to S303 in FIG. 3).
[0052]
As described above, according to the second embodiment, the cooling control of the light source can be appropriately performed even when the user forgets to turn off the power after the meeting.
[0053]
<Other embodiments>
It should be noted that the present invention can be applied to a system composed of a plurality of devices (for example, a host computer, interface device, reader, printer, etc.) or an apparatus composed of a single device (for example, a facsimile machine). May be.
[0054]
Another object of the present invention is to supply a storage medium (or recording medium) in which a program code of software that realizes the functions of the above-described embodiments is recorded to a system or apparatus, and the computer (or CPU or CPU) of the system or apparatus. Needless to say, this can also be achieved by the MPU) reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention. Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an operating system (OS) running on the computer based on the instruction of the program code. It goes without saying that a case where the function of the above-described embodiment is realized by performing part or all of the actual processing and the processing is included.
[0055]
Furthermore, after the program code read from the storage medium is written into a memory provided in a function expansion card inserted into the computer or a function expansion unit connected to the computer, the function is based on the instruction of the program code. It goes without saying that the CPU or the like provided in the expansion card or the function expansion unit performs part or all of the actual processing and the functions of the above-described embodiments are realized by the processing.
[0056]
【The invention's effect】
As described above, according to the present invention, when the use of the projection display device is finished, it is easy to confirm safety against light source cooling, so that the user's waiting time until the power is turned off is reduced.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a projector according to an embodiment of the invention.
FIG. 2 is a block diagram showing a functional configuration of a control unit 200 in the present embodiment.
FIG. 3 is a flowchart showing light source cooling control when the power is turned off in the present embodiment.
FIG. 4 is a diagram illustrating an example of conference management information registered in a conference management server.
FIG. 5 is a flowchart showing an operation of acquiring conference information 400 in the present embodiment.
FIG. 6 is a flowchart showing power control of the projector in the second embodiment.
[Explanation of symbols]
1 lamp (light source)
2R, 2G, 2B liquid crystal panel (light modulation element)
3 Video signal input means 57 Ballast 101 Temperature sensor 102 Fan D1 Projector

Claims (17)

Projection display means for performing display by irradiating the light modulation element with light from a light source and projecting the reflected or transmitted light through a projection lens;
Cooling means for cooling the light source;
Power switch means for instructing power off of the entire apparatus;
A light source switch means for turning off the power source for the light source in response to a power-off instruction by the switch means;
A communication means for sending and receiving e-mails over a network;
A light source cooling control method in a projection type display device comprising:
A temperature detecting step for detecting a temperature in the vicinity of the light source;
A transmission step of transmitting a predetermined message to a predetermined destination by the communication means according to the elapsed time and the detected temperature;
A light source cooling control method comprising: Furthermore, it has a time measuring step of measuring an elapsed time after power-off for the light source by the light source switch means,
The light source cooling control method according to claim 1, further comprising: a transmission step of transmitting a predetermined message to a predetermined destination by the communication unit according to the elapsed time and the detected temperature. In the transmission step, after the elapse of a predetermined time, if the detected temperature is equal to or lower than a predetermined value, a first message indicating that the cooling of the light source by the cooling unit has been normally completed is transmitted, and the temperature must be lower than the predetermined value. 2. The light source cooling control method according to claim 1, wherein a second message indicating that the cooling of the light source has ended abnormally is transmitted. 4. The light source according to claim 3, further comprising: an end step of stopping the cooling unit and turning off the power of the entire projection display device after transmitting the first message in the transmitting step. Cooling control method. 4. The light source cooling control according to claim 3, further comprising: an alarming step for issuing an alarm when an opening confirmation from the transmission destination cannot be received after transmitting the second message in the transmission step. Method. Furthermore, it has an information acquisition step of acquiring predetermined information from the server by the communication means,
4. The light source cooling control method according to claim 3, wherein, in the transmission step, the first and second messages are transmitted to a destination based on the predetermined information. The light source cooling control method according to claim 6, wherein the destination based on the predetermined information is an address of a user and an administrator of the projection display device. 8. The light source cooling control method according to claim 7, wherein, in the transmission step, the first message is transmitted to the address of the user, and the second message is transmitted to addresses of the user and an administrator. . The light source cooling control method according to claim 6, wherein the predetermined information is information related to a reservation for use of a conference room in which the projection display device is installed. 7. A light source off step of turning off the power source for the light source by the light source switch means when a predetermined time based on the predetermined information is reached during use of the projection display device. The light source cooling control method described. In addition, when the predetermined time is reached, there is a warning projection step of projecting a warning message indicating that the use of the projection display device is disabled,
11. The light source cooling control method according to claim 10, wherein, in the light source off step, the power source for the light source is turned off by the light source switch means after a predetermined time has elapsed since the warning message was projected. 11. The light source cooling according to claim 10, wherein the predetermined information is information relating to a reservation for use of a conference room in which the projection display device is installed, and the predetermined time is a reservation end time of the conference room. Control method. The further step of acquiring the predetermined information from the server by the communication means after the elapse of the predetermined time, and executing the light source off step if there is no continuous conference at the reservation end time of the conference. 12. The light source cooling control method according to 12. Projection display means for performing display by irradiating the light modulation element with light from a light source and projecting the reflected or transmitted light through a projection lens;
Cooling means for cooling the light source;
Power switch means for instructing power off of the entire apparatus;
A light source switch means for turning off the power source for the light source in response to a power-off instruction by the switch means;
A communication means for sending and receiving e-mails over a network;
A projection display device comprising:
Temperature detecting means for detecting the temperature in the vicinity of the light source,
A projection display device, wherein a predetermined message is transmitted to a predetermined destination by the communication means according to the elapsed time and the detected temperature. Furthermore, it has time measuring means for measuring the elapsed time after power-off for the light source by the light source switch means,
The light source cooling control apparatus according to claim 14, further comprising a transmission unit configured to transmit a predetermined message to a predetermined destination by the communication unit according to the elapsed time and the detected temperature. Projection display means for performing display by irradiating the light modulation element with light from a light source and projecting the reflected or transmitted light through a projection lens;
Cooling means for cooling the light source;
Power switch means for instructing power off of the entire apparatus;
A light source switch means for turning off the power source for the light source in response to a power-off instruction by the switch means;
A communication means for sending and receiving e-mails over a network;
A program for controlling light source cooling in a projection display device having
14. A control program that realizes the light source cooling control method according to claim 1 for the projection display device by being read into a computer and executed. A recording medium on which the program according to claim 16 is recorded.

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