WO2014170951A1 - Projector and lamp change detection method thereof - Google Patents

Projector and lamp change detection method thereof Download PDF

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Publication number
WO2014170951A1
WO2014170951A1 PCT/JP2013/061251 JP2013061251W WO2014170951A1 WO 2014170951 A1 WO2014170951 A1 WO 2014170951A1 JP 2013061251 W JP2013061251 W JP 2013061251W WO 2014170951 A1 WO2014170951 A1 WO 2014170951A1
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WO
WIPO (PCT)
Prior art keywords
lamp
projector
cover
opened
lamp voltage
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Application number
PCT/JP2013/061251
Other languages
French (fr)
Japanese (ja)
Inventor
小林　正和
Original Assignee
Ｎｅｃディスプレイソリューションズ株式会社
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Priority to JP2015512217A priority Critical patent/JP6061361B2/en
Priority to PCT/JP2013/061251 priority patent/WO2014170951A1/en
Publication of WO2014170951A1 publication Critical patent/WO2014170951A1/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2086—Security or safety means in lamp houses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/145—Housing details, e.g. position adjustments thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings

Definitions

  • the present invention relates to a projector including a lamp and a lamp replacement detection method thereof.
  • Some projectors that project images onto a screen use a high-intensity lamp as a light source for image projection. Since a lamp used for such a light source has a finite lifetime, it is necessary for a projector equipped with a lamp to manage an integrated value of the lamp lighting time (operation time) and replace the lamp at an appropriate time.
  • the lamp does not have a timer for measuring its lighting time or a non-volatile memory for storing measurement results, so the lamp lighting time is measured with a projector equipped with a CPU (Central Processing Unit).
  • the integrated value is stored in a nonvolatile memory or the like.
  • the stored integrated value of the lamp operating time (hereinafter referred to as “lamp usage time”) is displayed on a display unit or the like provided in a screen or projector, and is used for managing the lamp replacement time by the user.
  • the stored lamp usage time is used for warning display for notifying the user that it is time to replace the lamp.
  • a projector equipped with the lamp may not be equipped with a circuit or mechanism for detecting that the lamp has been replaced in order to suppress an increase in cost.
  • a code part indicating information on the lamp (lamp information) is attached to the outer bulb of the lamp, and information on the code part is obtained when power supply is resumed from a state where power supply to the projector is stopped. If the lamp information saved before the power supply stops is different from the read lamp information, it is determined that the lamp has been replaced, and the stored lamp usage time value can be reset. Are listed.
  • Patent Document 1 includes a movable member that rotates in accordance with a lamp replacement operation, and the movable member is turned on when power supply is resumed from a state where power supply to the projector is stopped.
  • the rotation position of the movable member stored before the power supply is stopped is different from the rotation position of the movable member detected after restarting the power supply operation, it is determined that the lamp has been replaced. Is described.
  • a projector is a projector including a lamp, A cover that is opened and closed when the lamp is replaced; A cover detector for detecting whether or not the cover is opened; A lamp voltage detector for detecting a lamp voltage applied to the lamp when the lamp is lit; An information holding unit with an auxiliary power source that stores cover opening / closing information indicating that the cover is opened when the cover is opened when the projector is in a power stop state; When the lamp is turned on, the lamp lighting time is measured, and the lamp usage time, which is an integrated value of the lighting time, is stored, and the lamp voltage is acquired from the lamp voltage detection unit every predetermined time and updated and stored.
  • the cover opening / closing information stored in the information holding unit indicates that the cover has been opened, and indicates that the cover has been opened.
  • the lamp voltage detected after the power supply is restarted is acquired from the lamp voltage detection unit, and the lamp is replaced when the acquired lamp voltage is lower than the lamp voltage stored before the power supply of the projector is stopped.
  • the projector A lamp, A cover that is opened and closed when the lamp is replaced; A cover detector for detecting whether or not the cover is opened; A lamp voltage detector for detecting a lamp voltage applied to the lamp when the lamp is lit; An information holding unit with an auxiliary power source; A control unit for controlling the operation of the projector; With The information holding unit is When the projector is in a power-off state, when the cover detection unit detects that the cover is opened, it stores cover opening / closing information indicating that the cover is opened, The control unit is When the lamp is turned on, the lamp lighting time is measured, and the lamp usage time, which is an integrated value of the lighting time, is stored, and the lamp voltage is acquired from the lamp voltage detection unit every predetermined time and updated and stored.
  • FIG. 1 is a block diagram illustrating a configuration example of a projector according to the present invention.
  • FIG. 2 is a block diagram illustrating a configuration example of a DCI projector including an SPB.
  • FIG. 3 is a flowchart showing an example of the processing procedure of the lamp replacement detection method of the present invention.
  • FIG. 1 is a block diagram showing a configuration example of a projector according to the present invention.
  • the projector 1 of the present invention includes a lamp 2, a cover 3, a lamp control device 4, an information holding unit 5, and a control unit 6.
  • the lamp 2 is installed in the main body of the projector 1.
  • the lamp 2 is a consumable part that needs to be replaced when a predetermined lamp usage time is reached, and a cover 3 is provided on the wall surface of the main body so that the user can easily replace the lamp 2 in the main body.
  • the cover 3 is, for example, a door or a lid.
  • the lamp 2 can be replaced by opening the cover 3.
  • the cover 3 is provided with a cover detection unit 7 that detects the opening / closing operation of the cover 3.
  • a switch (SW) is used for the cover detection unit 7, for example, a switch (SW) is used.
  • the lamp control device 4 controls the power supplied to the lamp 2 (hereinafter referred to as “lamp power”) so that the lamp 2 is maintained at a required brightness (luminance), for example, when the lamp 2 is lit.
  • the lamp control device 4 detects lamp voltage, for example, measuring a voltage applied to the lamp 2 (hereinafter referred to as “lamp voltage”).
  • lamp voltage is measured by the lamp voltage detection unit 11, and the current flowing through the lamp 2 (hereinafter referred to as the lamp 2 so that the lamp 2 is maintained at a required brightness) so as to maintain the lamp power at a required value.
  • lamp current the current flowing through the lamp 2
  • the information holding unit 5 can operate even when the power of the projector 1 shown in FIG. 1 is stopped by providing an auxiliary power source composed of a battery or a capacitor.
  • the information holding unit 5 stores information indicating whether or not the cover 3 is opened, which is detected using the cover detection unit 7 in a state where the power of the projector 1 is stopped. For example, when the information holding unit 5 supplies power to the switch, which is the cover detection unit 7, using an auxiliary power source, and detects the opening or connection between the switch contacts indicating that the cover 3 is opened, the information holding unit 5 opens and closes the cover 3.
  • the cover open / close information indicating that there was a problem is stored.
  • the information holding unit 5 only needs to detect that the lamp 2 may have been replaced when the projector 1 is powered off, and the cover 3 is detected when the projector 1 is powered off using the cover detection unit 7. What is necessary is just to detect whether it opened.
  • the information holding unit 5 is desirably configured to be able to suppress the power necessary for detecting the opening or connection between the switch contacts in order to lengthen the operation time of the auxiliary power supply. For example, since the cover 3 is normally closed, when the cover 3 is closed, the contact of the switch is opened and no current flows. When the cover 3 is open, the contact of the switch is connected and current flows. What is necessary is just to comprise so that it may flow.
  • the control unit 6 measures the lighting time and stores the lamp usage time obtained by integrating the lighting time. Further, the control unit 6 acquires the lamp voltage from the lamp control circuit 4 every predetermined time and updates / saves the lamp when the required power supply voltage is supplied to the projector 1 and the lamp 2 is lit. Further, when the supply of the required power supply voltage is resumed from the power supply stop state (hereinafter referred to as “power supply restart”) and the lamp 2 is turned on, the control unit 6 determines whether or not the cover 3 is opened, Processing is performed based on the determined result. For example, the control unit 6 determines whether or not the cover opening / closing information is stored in the information holding unit 5.
  • the control unit 6 determines that the cover 3 is opened, and the lamp control circuit 4.
  • the lamp voltage detected after restarting the power supply is lower than the lamp voltage stored before the power supply of the projector 1 is stopped, the lamp 2 is replaced with a new one.
  • the stored lamp usage time value is reset.
  • the lamp 2 has a higher lamp voltage because the electrodes deteriorate and the distance between the electrodes becomes longer as the lighting time elapses. Therefore, the lamp voltage tends to be low in the new lamp 2 and high in the lamp 2 whose lighting time has elapsed (the value of the lamp usage time is large).
  • the control unit 6 stores the current lamp voltage and the power before the power stop.
  • the lamp voltage is compared to determine whether the lamp 2 has been replaced. Specifically, when the lamp voltage acquired after the power supply restarts is lower than the lamp voltage stored before the power supply stop, it is determined that the lamp 2 has been replaced with a new one. When it is determined that the lamp 2 has been replaced, the control unit 6 resets the stored lamp usage time value.
  • the present invention it is determined whether or not the cover 3 is opened while the power of the projector 1 is stopped. If it is determined that the cover 3 is opened, the lamp voltage acquired after the power is restarted and the power before the power is stopped. Since it is determined whether or not the lamp 2 has been replaced by comparing with the stored lamp voltage, it is possible to easily determine whether or not the lamp 2 has been replaced. Therefore, unlike the technique described in Patent Document 1, it is not necessary to add many parts or provide a complicated mechanism in order to determine whether or not the lamp 2 is replaced. Therefore, it is possible to detect that the lamp 2 has been replaced while suppressing an increase in cost to a minimum. Further, the stored lamp usage time can be reset based on the detected result.
  • the information holding unit 5 shown in FIG. 1 can be realized by using a secure processing block (hereinafter referred to as “SPB”) described later. In that case, since it is not necessary to newly add the information holding part 5, the increase in the cost of the projector 1 can be further suppressed.
  • SPB secure processing block
  • DCI standards Digital Cinema Initiatives
  • the DCI standard in order to protect content such as video and audio, the content is encrypted and supplied to each theater such as a movie theater, and each theater decrypts the encrypted video signal and audio signal to project the projector. And playback using audio equipment. Further, the DCI standard requires that a projector or an audio device be provided with a security function for preventing theft or wiretapping of content after decryption.
  • a projector corresponding to the DCI standard (hereinafter referred to as a DCI projector) implements a function for decrypting an encrypted video signal and a security function for preventing theft of the decrypted video signal. SPB is provided.
  • the SPB defines a predetermined device in the DCI projector including its own device as an “SPB boundary”, and if there is an access such as an attack or intrusion into the SPB boundary from the outside, the SPB
  • the information (SPB information) indicating that there has been is saved and the content decryption process is stopped.
  • the SPB includes a battery (auxiliary power supply), and maintains the security function by operating with the battery even when the power of the DCI projector is stopped.
  • FIG. 2 is a block diagram showing an example of the configuration of a DCI projector provided with an SPB.
  • a DCI projector 101 shown in FIG. 2 includes a lamp 102, a lamp door 103, a lamp control device 104, an SPB 105, a control unit 106, a power switch 108, a light modulation device 109, and a projection optical system 120, and is a video signal decoded by the SPB 105.
  • the displayed image is projected onto the screen 200.
  • the SPB 105 receives an externally encrypted video signal via an input terminal 122 provided in the main body of the DCI projector 101, and the video signal decrypted by the SPB 105 is output to the light modulation device 109.
  • the SPB 105 includes a processor that decodes a video signal, a video signal processing circuit including a frame memory, a CPU that executes processing according to a control program, and a main storage device (RAM (Random) that temporarily holds information necessary for the processing of the CPU. It is realized by an information processing apparatus including a volatile memory such as “Access Memory”, a control program for causing the CPU to execute predetermined processing, and a secondary storage device (nonvolatile memory) in which various data are stored.
  • the lamp 102 is a light source for projecting an image on the screen 200, and a high-intensity lamp such as an ultra-high pressure mercury lamp is used.
  • a high-intensity lamp such as an ultra-high pressure mercury lamp is used.
  • the lamp 102 corresponds to the lamp 2 shown in FIG.
  • the lamp door 103 is a door that is opened and closed when the lamp 102 is replaced.
  • the lamp door 103 is provided on the back surface or the upper surface of the DCI projector 101 main body.
  • the lamp door 103 is provided with a switch (SW) 107 that opens or connects between the contacts in conjunction with the opening / closing operation of the lamp door 103.
  • SW switch
  • the lamp door 103 corresponds to the cover 3 shown in FIG. 1
  • the switch 107 corresponds to the cover detection unit 7 shown in FIG.
  • the lamp control device 104 supplies power to the lamp 102 to light it, and, for example, the lamp current is set so that the lamp 102 is maintained at a required brightness (luminance). Control.
  • the lamp control device 104 corresponds to the lamp control device 4 shown in FIG. 1
  • the lamp voltage detection unit 111 corresponds to the lamp voltage detection unit 11 shown in FIG.
  • the brightness of the lamp 102 is instructed from the control unit 106 to the lamp control device 104 in accordance with, for example, a setting input by the user of the DCI projector 101.
  • the lamp control device 104 measures the lamp voltage by, for example, the lamp voltage detection unit 111 and maintains the lamp power at a required value, that is, the lamp 102 is maintained at the required brightness. Adjust the current.
  • the luminance of the lamp 102 may be detected using a known optical sensor or the like. In that case, the lamp control device 104 may adjust the lamp current so as to obtain a required luminance based on the luminance of the lamp 102 detected by the optical sensor.
  • the lamp control device 104 includes, for example, a drive circuit that supplies required power to the lamp 102, a detection circuit that detects a lamp voltage (lamp voltage detection unit 111), a control circuit that controls the lamp current, and a control unit 106 and information (lamp brightness). Including a communication circuit or the like for transmitting / receiving the set value, the lamp voltage, and the like. Note that any known circuit may be used for this configuration.
  • the control unit 106 is a device that controls the operation of the entire DCI projector shown in FIG. In the DCI projector 101 shown in FIG. 2, the control unit 106 corresponds to the control unit 6 shown in FIG.
  • the control unit 106 executes a predetermined process on the CPU that executes processing according to a predetermined control program, a main storage device (volatile memory such as RAM) that temporarily holds information necessary for the processing of the CPU, and the CPU. It can be realized by an information processing apparatus including a sub-storage device (nonvolatile memory) in which a control program and various data (lamp usage time, lamp voltage, etc.) are stored.
  • the lamp replacement detection method of the present invention is realized, for example, when the CPU of the control unit 106 executes processing according to a control program.
  • the power switch 108 is a switch for the user of the DCI projector 101 to turn on or off the operation of a power supply device (not shown) that supplies required power to the DCI projector 101.
  • a power supply device (not shown) that supplies required power to the DCI projector 101.
  • the operation of the power supply device is stopped after a predetermined time has elapsed. This is because the lamp usage time must be updated / stored when the projector is stopped.
  • a power supply device stops operating after a predetermined time has elapsed.
  • the light modulation device 109 includes a well-known light modulation element such as a DMD (Digital Micromirror Device) or a liquid crystal panel, and reproduces the video indicated by the video signal decoded by the SPB 105.
  • a DMD Digital Micromirror Device
  • a liquid crystal panel reproduces the video indicated by the video signal decoded by the SPB 105.
  • the projection optical system 120 includes a lens, a prism, a mirror, and the like, and enlarges and projects an image reproduced by the light modulation device 109 on the screen 200 using the lamp 102 as a light source.
  • the DCI projector 101 shown in FIG. 2 also includes a switch 107 provided on the lamp door 103 at the SPB boundary defined by the SPB 105.
  • the SPB 105 detects that the contact of the switch 107 is opened or connected when the power of the DCI projector 101 is stopped, the SPB 105 stores cover opening / closing information indicating that the lamp door 103 has been opened / closed as the SPB information.
  • the SPB 105 provided in the DCI projector 101 shown in FIG. 2 does not have to stop the content (video signal) decoding process even if it detects that the lamp door 103 is opened or closed. In this way, by storing the cover opening / closing information by the SPB 105 when the power of the DCI projector 101 is stopped, the information holding unit 5 shown in FIG. 1 can be realized by the SPB 105 shown in FIG.
  • the control unit 106 starts measuring the lighting time of the lamp 102 using a timer, and the power switch 108 is turned off and the lamp control device 104 is turned off.
  • the measurement using the timer is stopped and the lighting time of the lamp 102 is obtained.
  • the obtained lighting time of the lamp 102 is added to the lamp usage time stored in the nonvolatile memory, and the value after the addition is updated and stored as a new lamp usage time.
  • the lamp usage time may be updated / stored not only when the lamp 102 is turned off, but also based on a predetermined update time of the lamp usage time.
  • the control unit 106 acquires, updates, and stores the value of the lamp voltage from the lamp control device 104 every predetermined time during the operation of the DCI projector 101 (while the lamp 102 is lit).
  • FIG. 3 is a flowchart showing an example of the processing procedure of the lamp replacement detection method of the present invention.
  • FIG. 3 shows the processing procedure of the lamp replacement detection method of the present invention taking the DCI projector 101 shown in FIG. 2 as an example.
  • the lamp replacement detection method of the present invention is a projector having any configuration including a lamp. It is also applicable to.
  • Step S1 when the power switch 108 of the DCI projector 101 is turned on and the operation of the DCI projector 101 is started by turning on the lamp 102, the control unit 106 starts measuring the lighting time of the lamp 102 ( Step S1).
  • control unit 106 acquires the SPB information stored in the SPB 105 from the SPB 105, and whether or not the cover opening / closing information is included in the SPB information, that is, the cover opening / closing information is stored in the information holding unit 5. It is confirmed whether it is (step S2).
  • step S6 acquires the value of the lamp voltage from the lamp control device 104 at every predetermined cycle, and updates / saves it.
  • the control unit 106 acquires the current lamp voltage value (hereinafter referred to as “first lamp voltage value”) from the lamp control device 104 (step S3).
  • the value of the lamp voltage tends to increase as the lighting time of the lamp 102 elapses. Therefore, the first lamp voltage value is compared with the lamp voltage value stored before the DCI projector 101 is turned off (hereinafter referred to as “second lamp voltage value”), and the first lamp voltage is compared. When the value is lower than the second lamp voltage value, it can be determined that the lamp 102 has been replaced with a new one while the power of the DCI projector 101 is stopped.
  • the control unit 106 determines whether or not the first lamp voltage value is lower than the second lamp voltage value (step S4). If the first lamp voltage value is lower than the second lamp voltage value, the lamp 102 is determined. Is replaced with a new one, and the stored lamp usage time value is reset and updated / saved (step S5). At this time, the control unit 106 considers a measurement error, a difference due to a lamp temperature, and the like, and the lamp 102 is replaced when, for example, the first lamp voltage value and the second lamp voltage value are equal to or larger than a predetermined voltage difference. It may be determined that
  • the control unit 106 determines that the lamp 102 has not been replaced. Subsequently, the control unit 106 proceeds to the process of step S6, acquires the value of the lamp voltage from the lamp control device 104 at every predetermined time, and updates / saves it.
  • step S8 the control unit 106 turns off the lamp 102, ends the measurement using the timer started in step S1, obtains the lighting time of the lamp 102, and obtains it.
  • the lighting time of the lamp 102 is added to the lamp usage time stored in the nonvolatile memory, and the value after the addition is updated and stored as a new lamp usage time (step S8).
  • the DCI projector 101 includes the switch 107 provided on the lamp door 103 at the SPB boundary defined by the SPB 105.
  • the cover opening / closing indicating that effect is performed.
  • Information is stored in the SPB 105 as SPB information.
  • the control unit 106 determines the lamp voltage value (first lamp voltage value) after the power supply restarts and the lamp voltage (second lamp voltage) stored before the DCI projector 101 is powered off. Value) to determine whether or not the lamp 102 has been replaced with a new one.
  • the information holding unit 5 can be realized using the SPB 105, so that it is detected that the lamp has been replaced while further suppressing an increase in the cost of the projector. be able to. Further, the stored lamp usage time can be reset based on the detected result.
  • the cover opening / closing information is information on opening / closing of the cover 3. Also good.
  • the control unit 106 opens the cover 3 when the stored cover opening / closing information indicates that the cover 3 is opened. What is necessary is just to judge. In this case, when the value of the lamp usage time is reset, the control unit 106 notifies the information holding unit 5 to that effect.
  • the information holding unit 5 receives the notification, the information holding unit 5 updates and stores the cover opening / closing information to information indicating that the cover 3 is not opened.
  • the lamp control circuit 4 includes the lamp voltage detection unit 11 that measures the lamp voltage, and the control unit 6 acquires the lamp voltage from the lamp control circuit 4. May be external to the lamp control circuit 4. In that case, the control unit 6 may acquire the lamp voltage from the lamp voltage detection unit 11.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Projection Apparatus (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

A cover detection unit is disposed in a cover which is opened and closed when changing a lamp, said cover detection unit detecting whether the cover is open. If the cover is opened when in a power off state, cover open/close information which indicates that the cover is opened is saved by an information retaining unit which has an auxiliary power source. A control unit measures and saves a lamp use time when the lamp is lit, and acquires, updates, and saves a lamp voltage for each of a prescribed time interval. If the cover open/close information which is saved in the information retaining unit indicates that the cover is open when the power is switched back on from the power off state, the control unit acquires the lamp voltage which is detected when the power is switched back on, and determines that the lamp has been changed if the acquired lamp voltage is lower than the lamp voltage which is saved prior to the power being switched off.

Description

プロジェクター及びそのランプ交換検出方法Projector and its lamp replacement detection method
　本発明はランプを備えたプロジェクター及びそのランプ交換検出方法に関する。 The present invention relates to a projector including a lamp and a lamp replacement detection method thereof.
　スクリーンに映像を投射するプロジェクターには、高輝度ランプを映像投射用の光源として用いるものがある。このような光源に用いるランプは有限な寿命であるため、ランプを備えるプロジェクターでは、該ランプの点灯時間（動作時間）の積算値を管理して適切な時期にランプを交換する必要がある。 Some projectors that project images onto a screen use a high-intensity lamp as a light source for image projection. Since a lamp used for such a light source has a finite lifetime, it is necessary for a projector equipped with a lamp to manage an integrated value of the lamp lighting time (operation time) and replace the lamp at an appropriate time.
　通常、ランプはその点灯時間を計測するためのタイマや計測結果を保存するための不揮発性メモリ等を備えていないため、ランプの点灯時間はＣＰＵ（Central Processing Unit）等を備えたプロジェクター本体で計測され、その積算値が不揮発性メモリ等で保存される。保存されたランプの点灯時間の積算値（以下、「ランプ使用時間」と称す）は、スクリーンやプロジェクターが備える表示部等へ表示させることで、ユーザによるランプの交換時期の管理に利用される。あるいは、保存されたランプ使用時間は、ランプの交換時期であることをユーザに通知するための警告表示に利用される。 Normally, the lamp does not have a timer for measuring its lighting time or a non-volatile memory for storing measurement results, so the lamp lighting time is measured with a projector equipped with a CPU (Central Processing Unit). The integrated value is stored in a nonvolatile memory or the like. The stored integrated value of the lamp operating time (hereinafter referred to as “lamp usage time”) is displayed on a display unit or the like provided in a screen or projector, and is used for managing the lamp replacement time by the user. Alternatively, the stored lamp usage time is used for warning display for notifying the user that it is time to replace the lamp.
　ところで、上記ランプを備えたプロジェクターでは、コストの増大を抑制するために、ランプが交換されたことを検出するための回路や機構を搭載していない場合がある。そのようなプロジェクターのユーザは、ランプを交換したときにプロジェクター本体で保存されたランプ使用時間をマニュアル操作等でリセット（ランプ使用時間＝０）しなければならない。 Incidentally, a projector equipped with the lamp may not be equipped with a circuit or mechanism for detecting that the lamp has been replaced in order to suppress an increase in cost. The user of such a projector must reset the lamp usage time stored in the projector main body by manual operation or the like (lamp usage time = 0) when the lamp is replaced.
　しかしながら、リセット操作を忘れる、あるいは操作が煩雑であるためにリセット操作を怠るなど、ランプを交換してもランプ使用時間のリセット操作が行われないケースがしばしばある。その結果、プロジェクター本体で保存されたランプ使用時間が不正な値となり、ランプの交換時期を管理できなくなったり、ランプ交換の警告が不必要に表示されたりするなど、プロジェクターの信頼性が損なわれてしまう。 However, there are many cases where the reset operation of the lamp usage time is not performed even if the lamp is replaced, such as forgetting the reset operation or neglecting the reset operation because the operation is complicated. As a result, the lamp usage time stored in the projector itself becomes an incorrect value, and it becomes impossible to manage the lamp replacement time, and the lamp replacement warning is displayed unnecessarily, which impairs the reliability of the projector. End up.
　なお、ランプが交換されたことを検出してランプ使用時間を自動でリセットする技術は、例えば特許文献１（特開２００８－０４６４９９号公報）で提案されている。 Note that a technique for detecting that the lamp has been replaced and automatically resetting the lamp usage time has been proposed in, for example, Japanese Patent Laid-Open No. 2008-046499.
　特許文献１では、ランプ外球に該ランプに関する情報（ランプ情報）を示すコード部を貼付しておき、プロジェクターに対する電源供給が停止している状態から電源供給が再開されたときにコード部の情報を読み取り、電源供給が停止する前に保存しておいたランプ情報と読み取ったランプ情報とが異なる場合にランプが交換されたと判定して、保存しているランプ使用時間の値をリセットすることが記載されている。 In Patent Document 1, a code part indicating information on the lamp (lamp information) is attached to the outer bulb of the lamp, and information on the code part is obtained when power supply is resumed from a state where power supply to the projector is stopped. If the lamp information saved before the power supply stops is different from the read lamp information, it is determined that the lamp has been replaced, and the stored lamp usage time value can be reset. Are listed.
　また、特許文献１には、他の実施例として、ランプの交換操作に伴って回転する可動部材を設け、プロジェクターに対する電源供給が停止している状態から電源供給が再開されたときに該可動部材の回転位置を検出し、電源供給が停止する前に保存しておいた可動部材の回転位置と電源動作の再開後に検出した可動部材の回転位置とが異なる場合にランプが交換されたと判定することが記載されている。 Further, as another example, Patent Document 1 includes a movable member that rotates in accordance with a lamp replacement operation, and the movable member is turned on when power supply is resumed from a state where power supply to the projector is stopped. When the rotation position of the movable member stored before the power supply is stopped is different from the rotation position of the movable member detected after restarting the power supply operation, it is determined that the lamp has been replaced. Is described.
　しかしながら、上記特許文献１に記載された技術では、ランプに貼付するコード部と該コード部の情報を読み取るための読み取り部、あるいは可動部材と該可動部材の回転位置を検出するためのセンサやスイッチ等をプロジェクターに追加する必要がある。そのため、ランプの交換有無を判別するために多くの部品を追加したり、複雑な機構を設けたりする必要があり、プロジェクターのコストが上昇してしまう。 However, in the technique described in Patent Document 1, a code unit to be attached to a lamp and a reading unit for reading information on the code unit, or a movable member and a sensor or switch for detecting the rotational position of the movable member Etc. need to be added to the projector. For this reason, it is necessary to add many parts or to provide a complicated mechanism in order to determine whether or not the lamp is replaced, which increases the cost of the projector.
特開２００８－０４６４９９号公報JP 2008-046499 A
　本発明は、上述した課題を解決するプロジェクター及びそのランプ交換検出方法を提供することを目的とする。 It is an object of the present invention to provide a projector and a lamp replacement detection method for solving the above-described problems.
　上記目的を達成するため本発明のプロジェクターは、ランプを備えたプロジェクターであって、
　前記ランプを交換するときに開閉されるカバーと、
　前記カバーが開いたか否かを検出するカバー検出部と、
　前記ランプが点灯しているときに前記ランプへ印加するランプ電圧を検出するランプ電圧検出部と、
　前記プロジェクターが電源停止状態において、前記カバーが開くと、前記カバーが開いたことを示すカバー開閉情報を保存する、補助電源を備えた情報保持部と、
　前記ランプが点灯すると前記ランプの点灯時間を計測し、該点灯時間の積算値であるランプ使用時間を保存すると共に、前記ランプ電圧検出部から所定の時間毎に前記ランプ電圧を取得して更新保存し、前記プロジェクターの電源停止状態から電源再開の後、前記情報保持部に保存された前記カバー開閉情報が前記カバーが開いたことを示すか否かを判定し、前記カバーが開いたことを示す場合は、前記ランプ電圧検出部から電源再開後に検出されたランプ電圧を取得し、該取得したランプ電圧が前記プロジェクターの電源停止前に保存していたランプ電圧よりも低い場合は前記ランプが交換されたと判定する制御部と、
を有する。 In order to achieve the above object, a projector according to the present invention is a projector including a lamp,
A cover that is opened and closed when the lamp is replaced;
A cover detector for detecting whether or not the cover is opened;
A lamp voltage detector for detecting a lamp voltage applied to the lamp when the lamp is lit;
An information holding unit with an auxiliary power source that stores cover opening / closing information indicating that the cover is opened when the cover is opened when the projector is in a power stop state;
When the lamp is turned on, the lamp lighting time is measured, and the lamp usage time, which is an integrated value of the lighting time, is stored, and the lamp voltage is acquired from the lamp voltage detection unit every predetermined time and updated and stored. Then, after restarting the power supply from the power stop state of the projector, it is determined whether or not the cover opening / closing information stored in the information holding unit indicates that the cover has been opened, and indicates that the cover has been opened. In this case, the lamp voltage detected after the power supply is restarted is acquired from the lamp voltage detection unit, and the lamp is replaced when the acquired lamp voltage is lower than the lamp voltage stored before the power supply of the projector is stopped. A control unit for determining that
Have
　一方、本発明のプロジェクターのランプ交換検出方法は、プロジェクターが、
　ランプと、
　前記ランプを交換するときに開閉されるカバーと、
　前記カバーが開いたか否かを検出するカバー検出部と、
　前記ランプが点灯しているときに前記ランプへ印加するランプ電圧を検出するランプ電圧検出部と、
　補助電源を備えた情報保持部と、
　前記プロジェクターの動作を制御する制御部と、
を備え、
　前記情報保持部が、
　前記プロジェクターが電源停止状態において、前記カバー検出部により前記カバーが開いたことが検出されると、前記カバーが開いたことを示すカバー開閉情報を保存し、
　前記制御部が、
　前記ランプが点灯すると前記ランプの点灯時間を計測し、該点灯時間の積算値であるランプ使用時間を保存すると共に、前記ランプ電圧検出部から所定の時間毎に前記ランプ電圧を取得して更新保存し、
　前記プロジェクターの電源停止状態から電源再開の後、前記情報保持部に保存された前記カバー開閉情報が前記カバーが開いたことを示すか否かを判定し、
　前記カバーが開いたことを示す場合は、前記ランプ電圧検出部から電源再開後に検出されたランプ電圧を取得し、
　該取得したランプ電圧が前記プロジェクターの電源停止前に保存していたランプ電圧よりも低い場合は前記ランプが交換されたと判定する方法である。 On the other hand, in the projector lamp replacement detection method of the present invention, the projector
A lamp,
A cover that is opened and closed when the lamp is replaced;
A cover detector for detecting whether or not the cover is opened;
A lamp voltage detector for detecting a lamp voltage applied to the lamp when the lamp is lit;
An information holding unit with an auxiliary power source;
A control unit for controlling the operation of the projector;
With
The information holding unit is
When the projector is in a power-off state, when the cover detection unit detects that the cover is opened, it stores cover opening / closing information indicating that the cover is opened,
The control unit is
When the lamp is turned on, the lamp lighting time is measured, and the lamp usage time, which is an integrated value of the lighting time, is stored, and the lamp voltage is acquired from the lamp voltage detection unit every predetermined time and updated and stored. And
Determining whether the cover opening / closing information stored in the information holding unit indicates that the cover has been opened after restarting the power supply from the power stop state of the projector;
When indicating that the cover has been opened, obtain the lamp voltage detected after the power supply resumed from the lamp voltage detection unit,
This is a method of determining that the lamp has been replaced when the acquired lamp voltage is lower than the lamp voltage stored before the projector is powered off.
　本発明によれば、コストの上昇を最小限に抑制しつつ、ランプが交換されたことを検出することができる。 According to the present invention, it is possible to detect that the lamp has been replaced while minimizing an increase in cost.
図１は、本発明のプロジェクターの一構成例を示すブロック図である。FIG. 1 is a block diagram illustrating a configuration example of a projector according to the present invention. 図２は、ＳＰＢを備えたＤＣＩプロジェクターの一構成例を示すブロック図である。FIG. 2 is a block diagram illustrating a configuration example of a DCI projector including an SPB. 図３は、本発明のランプ交換検出方法の処理手順の一例を示すフローチャートである。FIG. 3 is a flowchart showing an example of the processing procedure of the lamp replacement detection method of the present invention.
　次に本発明について図面を参照して説明する。 Next, the present invention will be described with reference to the drawings.
　図１は、本発明のプロジェクターの一構成例を示すブロック図である。 FIG. 1 is a block diagram showing a configuration example of a projector according to the present invention.
　図１に示すように、本発明のプロジェクター１は、ランプ２、カバー３、ランプ制御装置４、情報保持部５及び制御部６を有する。 As shown in FIG. 1, the projector 1 of the present invention includes a lamp 2, a cover 3, a lamp control device 4, an information holding unit 5, and a control unit 6.
　ランプ２は、プロジェクター１の本体内に設置されている。ランプ２は、所定のランプ使用時間になると交換が必要な消耗部品であり、本体内のランプ２をユーザが容易に交換できるように本体壁面等にカバー３が設けられている。カバー３は、例えばドアや蓋などである。ランプ２はカバー３を開くことで交換が可能である。プロジェクター１に所要の電源電圧が供給されていない（以下、この状態を「電源停止」と称す）とき、ランプ２が交換される。カバー３には、カバー３の開閉動作を検出するカバー検出部７が設けられている。カバー検出部７には、例えばスイッチ（ＳＷ）が用いられる。 The lamp 2 is installed in the main body of the projector 1. The lamp 2 is a consumable part that needs to be replaced when a predetermined lamp usage time is reached, and a cover 3 is provided on the wall surface of the main body so that the user can easily replace the lamp 2 in the main body. The cover 3 is, for example, a door or a lid. The lamp 2 can be replaced by opening the cover 3. When the required power supply voltage is not supplied to the projector 1 (hereinafter, this state is referred to as “power supply stop”), the lamp 2 is replaced. The cover 3 is provided with a cover detection unit 7 that detects the opening / closing operation of the cover 3. For the cover detection unit 7, for example, a switch (SW) is used.
　ランプ制御装置４は、ランプ２が点灯すると、例えばランプ２が所要の明るさ（輝度）で維持されるように、ランプ２へ供給する電力（以下、「ランプ電力」と称す）を制御する。 The lamp control device 4 controls the power supplied to the lamp 2 (hereinafter referred to as “lamp power”) so that the lamp 2 is maintained at a required brightness (luminance), for example, when the lamp 2 is lit.
　ランプ２の明るさ（輝度）はランプに供給される電力と相関があるため、ランプ制御装置４は、例えばランプ２に印加する電圧（以下、「ランプ電圧」と称す）を測定するランプ電圧検出部１１を備え、ランプ電圧検出部１１によりランプ電圧を測定し、ランプ電力を所要の値で維持するように、すなわちランプ２が所要の輝度で維持されるようにランプ２に流れる電流（以下、「ランプ電流」と称す）を調整する。 Since the brightness (luminance) of the lamp 2 has a correlation with the power supplied to the lamp, the lamp control device 4 detects lamp voltage, for example, measuring a voltage applied to the lamp 2 (hereinafter referred to as “lamp voltage”). Unit 11, the lamp voltage is measured by the lamp voltage detection unit 11, and the current flowing through the lamp 2 (hereinafter referred to as the lamp 2 so that the lamp 2 is maintained at a required brightness) so as to maintain the lamp power at a required value. (Referred to as “lamp current”).
　情報保持部５は、バッテリーやコンデンサなどで構成される補助電源を備えることで図１に示すプロジェクター１の電源停止の状態でも動作が可能である。また、情報保持部５は、プロジェクター１の電源停止の状態において、カバー検出部７を用いて検出された、カバー３が開いたか否かを示す情報を保存する。例えば、情報保持部５は、カバー検出部７であるスイッチに補助電源を用いて電源を供給し、カバー３が開いたことを示すスイッチの接点間の開放または接続を検出すると、カバー３の開閉があったことを示すカバー開閉情報を保存する。なお、情報保持部５は、プロジェクター１が電源停止のときにランプ２が交換された可能性があることを検出できればよく、カバー検出部７を用いてプロジェクター１が電源停止のときにカバー３が開いたか否かを検出すればよい。また、情報保持部５は、補助電源の動作時間を長くするために、スイッチの接点間の開放または接続の検出に必要な電力を抑制できる構成とすることが望ましい。例えば、通常、カバー３は閉じられているので、カバー３が閉のときに、スイッチの接点が開放されて電流が流れず、カバー３が開のときに、スイッチの接点が接続されて電流が流れるように構成すればよい。 The information holding unit 5 can operate even when the power of the projector 1 shown in FIG. 1 is stopped by providing an auxiliary power source composed of a battery or a capacitor. The information holding unit 5 stores information indicating whether or not the cover 3 is opened, which is detected using the cover detection unit 7 in a state where the power of the projector 1 is stopped. For example, when the information holding unit 5 supplies power to the switch, which is the cover detection unit 7, using an auxiliary power source, and detects the opening or connection between the switch contacts indicating that the cover 3 is opened, the information holding unit 5 opens and closes the cover 3. The cover open / close information indicating that there was a problem is stored. The information holding unit 5 only needs to detect that the lamp 2 may have been replaced when the projector 1 is powered off, and the cover 3 is detected when the projector 1 is powered off using the cover detection unit 7. What is necessary is just to detect whether it opened. In addition, the information holding unit 5 is desirably configured to be able to suppress the power necessary for detecting the opening or connection between the switch contacts in order to lengthen the operation time of the auxiliary power supply. For example, since the cover 3 is normally closed, when the cover 3 is closed, the contact of the switch is opened and no current flows. When the cover 3 is open, the contact of the switch is connected and current flows. What is necessary is just to comprise so that it may flow.
　制御部６は、図１に示すランプ２が点灯すると、その点灯時間を計測し、点灯時間を積算したランプ使用時間を保存する。また、制御部６は、プロジェクター１に所要の電源電圧が供給されてランプ２が点灯しているとき、ランプ制御回路４から所定の時間毎にランプ電圧を取得して更新・保存する。さらに、制御部６は、電源停止状態から所要の電源電圧の供給が再開され（以下、「電源再開」と称す）、ランプ２が点灯されると、カバー３が開いたか否かを判定し、判定した結果に基づいて処理を行う。例えば、制御部６は、情報保持部５に上記カバー開閉情報が保存されているか否かを判定し、カバー開閉情報が保存されている場合は、カバー３が開いたと判定し、ランプ制御回路４から電源再開後に検出されたランプ電圧を取得し、該電源再開後に検出されたランプ電圧がプロジェクター１の電源停止前に保存していたランプ電圧よりも低いときは、ランプ２が新しいものに交換されたと判定して保存しているランプ使用時間の値をリセットする。 When the lamp 2 shown in FIG. 1 is lit, the control unit 6 measures the lighting time and stores the lamp usage time obtained by integrating the lighting time. Further, the control unit 6 acquires the lamp voltage from the lamp control circuit 4 every predetermined time and updates / saves the lamp when the required power supply voltage is supplied to the projector 1 and the lamp 2 is lit. Further, when the supply of the required power supply voltage is resumed from the power supply stop state (hereinafter referred to as “power supply restart”) and the lamp 2 is turned on, the control unit 6 determines whether or not the cover 3 is opened, Processing is performed based on the determined result. For example, the control unit 6 determines whether or not the cover opening / closing information is stored in the information holding unit 5. When the cover opening / closing information is stored, the control unit 6 determines that the cover 3 is opened, and the lamp control circuit 4. When the lamp voltage detected after restarting the power supply is lower than the lamp voltage stored before the power supply of the projector 1 is stopped, the lamp 2 is replaced with a new one. The stored lamp usage time value is reset.
　通常、ランプ２は、点灯時間が経過すると共に電極が劣化して電極間の距離が長くなるため、ランプ電圧が高くなる。したがって、ランプ電圧は、新しいランプ２では低く、点灯時間が経過した（ランプ使用時間の値が大きい）ランプ２では高くなる傾向にある。 Normally, the lamp 2 has a higher lamp voltage because the electrodes deteriorate and the distance between the electrodes becomes longer as the lighting time elapses. Therefore, the lamp voltage tends to be low in the new lamp 2 and high in the lamp 2 whose lighting time has elapsed (the value of the lamp usage time is large).
　そこで、情報保持部５でカバー開閉情報が保存されている場合は電源停止の間にランプ２が交換された可能性があるため、制御部６は現在のランプ電圧と電源停止前に保存していたランプ電圧とを比較してランプ２が交換されたか否かを判定する。具体的には、電源再開後に取得したランプ電圧が電源停止前に保存していたランプ電圧よりも低い場合はランプ２が新しいものに交換されたと判定する。制御部６は、ランプ２が交換されたと判定したとき、保存しているランプ使用時間の値をリセットする。 Therefore, when the cover opening / closing information is stored in the information holding unit 5, the lamp 2 may have been replaced during the power stop, so the control unit 6 stores the current lamp voltage and the power before the power stop. The lamp voltage is compared to determine whether the lamp 2 has been replaced. Specifically, when the lamp voltage acquired after the power supply restarts is lower than the lamp voltage stored before the power supply stop, it is determined that the lamp 2 has been replaced with a new one. When it is determined that the lamp 2 has been replaced, the control unit 6 resets the stored lamp usage time value.
　以上説明したように、本発明によれば、プロジェクター１の電源停止中にカバー３が開いたか否かを判定し、カバー３が開いたと判定すると、電源再開後に取得したランプ電圧と電源停止前に保存していたランプ電圧とを比較してランプ２が交換されたか否かを判定するので、ランプ２の交換有無を容易に判別できる。そのため、上記特許文献１に記載された技術のように、ランプ２の交換有無を判別するために多くの部品を追加したり、複雑な機構を設けたりする必要がない。したがって、コストの上昇を最小限に抑制しつつ、ランプ２が交換されたことを検出することができる。また、該検出した結果に基づいて保存しているランプ使用時間をリセットできる。 As described above, according to the present invention, it is determined whether or not the cover 3 is opened while the power of the projector 1 is stopped. If it is determined that the cover 3 is opened, the lamp voltage acquired after the power is restarted and the power before the power is stopped. Since it is determined whether or not the lamp 2 has been replaced by comparing with the stored lamp voltage, it is possible to easily determine whether or not the lamp 2 has been replaced. Therefore, unlike the technique described in Patent Document 1, it is not necessary to add many parts or provide a complicated mechanism in order to determine whether or not the lamp 2 is replaced. Therefore, it is possible to detect that the lamp 2 has been replaced while suppressing an increase in cost to a minimum. Further, the stored lamp usage time can be reset based on the detected result.
　なお、プロジェクター１が後述するＤＣＩ規格に対応する場合、図１に示した情報保持部５は後述するセキュアプロセッシングブロック（Secure Processor Block：以下、「ＳＰＢ」と称す）を用いて実現できる。その場合、情報保持部５も新たに追加する必要がないため、プロジェクター１のコストの上昇をさらに抑制できる。以下、上記ＳＰＢを備えたプロジェクターについて説明する。 When the projector 1 supports the DCI standard described later, the information holding unit 5 shown in FIG. 1 can be realized by using a secure processing block (hereinafter referred to as “SPB”) described later. In that case, since it is not necessary to newly add the information holding part 5, the increase in the cost of the projector 1 can be further suppressed. Hereinafter, a projector provided with the SPB will be described.
　近年、米国の大手映画会社が組織する業界団体であるＤＣＩ（Digital Cinema Initiatives）が策定した上映規格（以下、「ＤＣＩ規格」と称す）に対応するプロジェクターが登場し、映画館等における、いわゆるデジタルシネマの上映にもプロジェクターが利用されるようになってきている。 In recent years, projectors that support screening standards (hereinafter referred to as “DCI standards”) established by DCI (Digital Cinema Initiatives), an industry group organized by major movie companies in the United States, have emerged, so-called digital in movie theaters and the like. Projectors are also being used for cinema screenings.
　このＤＣＩ規格では、映像や音声等のコンテンツを保護するために該コンテンツが暗号化されて映画館等の各劇場に供給され、各劇場では暗号化された映像信号や音声信号を復号してプロジェクターや音響機器を利用して再生する。さらに、ＤＣＩ規格では、復号後のコンテンツの盗難や盗聴を防止するためのセキュリティ機能をプロジェクターや音響機器に備えることを要求している。 In this DCI standard, in order to protect content such as video and audio, the content is encrypted and supplied to each theater such as a movie theater, and each theater decrypts the encrypted video signal and audio signal to project the projector. And playback using audio equipment. Further, the DCI standard requires that a projector or an audio device be provided with a security function for preventing theft or wiretapping of content after decryption.
　そのため、ＤＣＩ規格に対応するプロジェクター（以下、ＤＣＩプロジェクターと称す）は、暗号化された映像信号を復号するための機能、並びに復号後の映像信号の盗難を防止するためのセキュリティ機能を実現する上記ＳＰＢを備えている。 Therefore, a projector corresponding to the DCI standard (hereinafter referred to as a DCI projector) implements a function for decrypting an encrypted video signal and a security function for preventing theft of the decrypted video signal. SPB is provided.
　ＳＰＢは、セキュリティ機能を実現するために、自装置を含むＤＣＩプロジェクター内の所定の装置を「ＳＰＢ境界」として定義し、外部から該ＳＰＢ境界内に対する攻撃や侵入等のアクセスがあると、該アクセスがあったことを示す情報（ＳＰＢ情報）を保存すると共にコンテンツの復号処理を停止する。ＳＰＢは、バッテリー（補助電源）を備えており、ＤＣＩプロジェクターの電源停止時も該バッテリーで動作することで上記セキュリティ機能を維持している。 In order to realize the security function, the SPB defines a predetermined device in the DCI projector including its own device as an “SPB boundary”, and if there is an access such as an attack or intrusion into the SPB boundary from the outside, the SPB The information (SPB information) indicating that there has been is saved and the content decryption process is stopped. The SPB includes a battery (auxiliary power supply), and maintains the security function by operating with the battery even when the power of the DCI projector is stopped.
　図２は、ＳＰＢを備えたＤＣＩプロジェクターの一構成例を示すブロック図である。 FIG. 2 is a block diagram showing an example of the configuration of a DCI projector provided with an SPB.
　図２に示すＤＣＩプロジェクター１０１は、ランプ１０２、ランプドア１０３、ランプ制御装置１０４、ＳＰＢ１０５、制御部１０６、電源スイッチ１０８、光変調装置１０９および投射光学系１２０を備え、ＳＰＢ１０５で復号された映像信号で示される映像をスクリーン２００に投射する構成である。 A DCI projector 101 shown in FIG. 2 includes a lamp 102, a lamp door 103, a lamp control device 104, an SPB 105, a control unit 106, a power switch 108, a light modulation device 109, and a projection optical system 120, and is a video signal decoded by the SPB 105. In this configuration, the displayed image is projected onto the screen 200.
　ＳＰＢ１０５には、ＤＣＩプロジェクター１０１の本体に設けられた入力端子１２２を介して外部から暗号化された映像信号が入力され、ＳＰＢ１０５で復号された映像信号は光変調装置１０９へ出力される。ＳＰＢ１０５は、映像信号を復号するプロセッサやフレームメモリを含む映像信号処理回路、制御プログラムにしたがって処理を実行するＣＰＵ、該ＣＰＵの処理で必要な情報を一時的に保持する主記憶装置（ＲＡＭ（Random Access Memory）等の揮発性メモリ）、ＣＰＵに所定の処理を実行させるための制御プログラムや各種のデータが保存される副記憶装置（不揮発性メモリ）等を含む情報処理装置で実現される。 The SPB 105 receives an externally encrypted video signal via an input terminal 122 provided in the main body of the DCI projector 101, and the video signal decrypted by the SPB 105 is output to the light modulation device 109. The SPB 105 includes a processor that decodes a video signal, a video signal processing circuit including a frame memory, a CPU that executes processing according to a control program, and a main storage device (RAM (Random) that temporarily holds information necessary for the processing of the CPU. It is realized by an information processing apparatus including a volatile memory such as “Access Memory”, a control program for causing the CPU to execute predetermined processing, and a secondary storage device (nonvolatile memory) in which various data are stored.
　ランプ１０２は、スクリーン２００に映像を投影するための光源であり、超高圧水銀ランプ等の高輝度ランプが用いられる。図２に示すＤＣＩプロジェクター１０１では、ランプ１０２が図１に示したランプ２に相当する。 The lamp 102 is a light source for projecting an image on the screen 200, and a high-intensity lamp such as an ultra-high pressure mercury lamp is used. In the DCI projector 101 shown in FIG. 2, the lamp 102 corresponds to the lamp 2 shown in FIG.
　ランプドア１０３は、ランプ１０２の交換時に開閉される扉であり、例えばＤＣＩプロジェクター１０１本体の背面や上面等に設けられる。ランプドア１０３には、ランプドア１０３の開閉動作と連動して接点間が開放または接続されるスイッチ（ＳＷ）１０７が設けられている。図２に示すＤＣＩプロジェクター１０１では、ランプドア１０３が図１に示したカバー３に相当し、スイッチ１０７が図１に示したカバー検出部７に相当する。 The lamp door 103 is a door that is opened and closed when the lamp 102 is replaced. For example, the lamp door 103 is provided on the back surface or the upper surface of the DCI projector 101 main body. The lamp door 103 is provided with a switch (SW) 107 that opens or connects between the contacts in conjunction with the opening / closing operation of the lamp door 103. In the DCI projector 101 shown in FIG. 2, the lamp door 103 corresponds to the cover 3 shown in FIG. 1, and the switch 107 corresponds to the cover detection unit 7 shown in FIG.
　ランプ制御装置１０４は、図２に示すＤＣＩプロジェクター１０１の動作時、ランプ１０２に電力を供給して点灯させるとともに、ランプ１０２が所要の明るさ（輝度）で維持されるように、例えばランプ電流を制御する。図２に示すＤＣＩプロジェクター１０１では、ランプ制御装置１０４が図１に示したランプ制御装置４に相当し、ランプ電圧検出部１１１が図１に示したランプ電圧検出部１１に相当する。ランプ１０２の輝度は、例えばＤＣＩプロジェクター１０１のユーザによる設定入力にしたがって制御部１０６からランプ制御装置１０４に指示される。 When the DCI projector 101 shown in FIG. 2 operates, the lamp control device 104 supplies power to the lamp 102 to light it, and, for example, the lamp current is set so that the lamp 102 is maintained at a required brightness (luminance). Control. In the DCI projector 101 shown in FIG. 2, the lamp control device 104 corresponds to the lamp control device 4 shown in FIG. 1, and the lamp voltage detection unit 111 corresponds to the lamp voltage detection unit 11 shown in FIG. The brightness of the lamp 102 is instructed from the control unit 106 to the lamp control device 104 in accordance with, for example, a setting input by the user of the DCI projector 101.
　上述したように、ランプ制御装置１０４は、例えばランプ電圧検出部１１１によりランプ電圧を測定し、ランプ電力を所要の値で維持するように、すなわちランプ１０２が所要の輝度で維持されるようにランプ電流を調整する。なお、ランプ１０２の輝度は周知の光センサ等を用いて検出してもよい。その場合、ランプ制御装置１０４は、光センサで検出されたランプ１０２の輝度に基づき、所要の輝度が得られるようにランプ電流を調整すればよい。ランプ制御装置１０４は、例えばランプ１０２に所要の電力を供給する駆動回路、ランプ電圧を検出する検出回路（ランプ電圧検出部１１１）、ランプ電流を制御する制御回路、制御部１０６と情報（ランプ輝度の設定値、ランプ電圧等）を送受信するための通信回路等を含み構成される。なお、この構成は、周知のどのような回路を用いてもよい。 As described above, the lamp control device 104 measures the lamp voltage by, for example, the lamp voltage detection unit 111 and maintains the lamp power at a required value, that is, the lamp 102 is maintained at the required brightness. Adjust the current. Note that the luminance of the lamp 102 may be detected using a known optical sensor or the like. In that case, the lamp control device 104 may adjust the lamp current so as to obtain a required luminance based on the luminance of the lamp 102 detected by the optical sensor. The lamp control device 104 includes, for example, a drive circuit that supplies required power to the lamp 102, a detection circuit that detects a lamp voltage (lamp voltage detection unit 111), a control circuit that controls the lamp current, and a control unit 106 and information (lamp brightness). Including a communication circuit or the like for transmitting / receiving the set value, the lamp voltage, and the like. Note that any known circuit may be used for this configuration.
　制御部１０６は、図２に示すＤＣＩプロジェクター全体の動作を制御する装置である。図２に示すＤＣＩプロジェクター１０１では、制御部１０６が図１に示した制御部６に相当する。制御部１０６は、所定の制御プログラムにしたがって処理を実行するＣＰＵ、該ＣＰＵの処理で必要な情報を一時的に保持する主記憶装置（ＲＡＭ等の揮発性メモリ）、ＣＰＵに所定の処理を実行させるための制御プログラムや各種のデータ（ランプ使用時間、ランプ電圧等）が保存される副記憶装置（不揮発性メモリ）等を含む情報処理装置で実現できる。本発明のランプ交換検出方法は、例えば制御部１０６のＣＰＵが制御プログラムにしたがって処理を実行することで実現される。 The control unit 106 is a device that controls the operation of the entire DCI projector shown in FIG. In the DCI projector 101 shown in FIG. 2, the control unit 106 corresponds to the control unit 6 shown in FIG. The control unit 106 executes a predetermined process on the CPU that executes processing according to a predetermined control program, a main storage device (volatile memory such as RAM) that temporarily holds information necessary for the processing of the CPU, and the CPU. It can be realized by an information processing apparatus including a sub-storage device (nonvolatile memory) in which a control program and various data (lamp usage time, lamp voltage, etc.) are stored. The lamp replacement detection method of the present invention is realized, for example, when the CPU of the control unit 106 executes processing according to a control program.
　電源スイッチ１０８は、ＤＣＩプロジェクター１０１に所要の電力を供給する電源装置（不図示）の動作を該ＤＣＩプロジェクター１０１のユーザがオンまたはオフさせるためのスイッチである。但し、一般的なプロジェクターは、電源スイッチがオフされてランプが消灯しても所要の時間が経過した後に電源装置の動作が停止する。これは、プロジェクターの動作停止時に上記ランプ使用時間の更新・保存処理等を必要とするからである。図２に示すＤＣＩプロジェクター１０１においても、電源スイッチ１０８がオフされると所要の時間が経過した後に不図示の電源装置が動作を停止するものとする。 The power switch 108 is a switch for the user of the DCI projector 101 to turn on or off the operation of a power supply device (not shown) that supplies required power to the DCI projector 101. However, in a general projector, even if the power switch is turned off and the lamp is turned off, the operation of the power supply device is stopped after a predetermined time has elapsed. This is because the lamp usage time must be updated / stored when the projector is stopped. Also in the DCI projector 101 shown in FIG. 2, when the power switch 108 is turned off, a power supply device (not shown) stops operating after a predetermined time has elapsed.
　光変調装置１０９は、ＤＭＤ（Digital Micromirror Device）、液晶パネル等の周知の光変調素子を備え、ＳＰＢ１０５で復号された映像信号で示される映像を再生する。 The light modulation device 109 includes a well-known light modulation element such as a DMD (Digital Micromirror Device) or a liquid crystal panel, and reproduces the video indicated by the video signal decoded by the SPB 105.
　投射光学系１２０は、レンズ、プリズム、ミラー等を備え、ランプ１０２を光源に用いて光変調装置１０９で再生された映像をスクリーン２００へ拡大投射する。 The projection optical system 120 includes a lens, a prism, a mirror, and the like, and enlarges and projects an image reproduced by the light modulation device 109 on the screen 200 using the lamp 102 as a light source.
　このような構成において、図２に示すＤＣＩプロジェクター１０１では、ＳＰＢ１０５が定義する上記ＳＰＢ境界にランプドア１０３に設けられたスイッチ１０７も含める。ＳＰＢ１０５は、ＤＣＩプロジェクター１０１の電源停止時、スイッチ１０７の接点間が開放または接続されたことを検出すると、ランプドア１０３の開閉があったことを示すカバー開閉情報を上記ＳＰＢ情報として保存する。図２に示すＤＣＩプロジェクター１０１が備えるＳＰＢ１０５は、ランプドア１０３が開閉されたことを検出してもコンテンツ（映像信号）の復号処理を停止しなくてもよい。このようにＤＣＩプロジェクター１０１の電源停止時にＳＰＢ１０５でカバー開閉情報を保存することで、図２に示すＳＰＢ１０５により図１に示した情報保持部５を実現できる。 In such a configuration, the DCI projector 101 shown in FIG. 2 also includes a switch 107 provided on the lamp door 103 at the SPB boundary defined by the SPB 105. When the SPB 105 detects that the contact of the switch 107 is opened or connected when the power of the DCI projector 101 is stopped, the SPB 105 stores cover opening / closing information indicating that the lamp door 103 has been opened / closed as the SPB information. The SPB 105 provided in the DCI projector 101 shown in FIG. 2 does not have to stop the content (video signal) decoding process even if it detects that the lamp door 103 is opened or closed. In this way, by storing the cover opening / closing information by the SPB 105 when the power of the DCI projector 101 is stopped, the information holding unit 5 shown in FIG. 1 can be realized by the SPB 105 shown in FIG.
　制御部１０６は、電源スイッチ１０８がオンされてランプ制御装置１０４によりランプ１０２を点灯させると、タイマを用いてランプ１０２の点灯時間の計測を開始し、電源スイッチ１０８がオフされてランプ制御装置１０４によりランプ１０２を消灯させると、タイマを用いた計測を停止してランプ１０２の点灯時間を求める。その後、求めたランプ１０２の点灯時間を不揮発性メモリで保存しているランプ使用時間に加算し、加算後の値を新たなランプ使用時間として更新・保存する。なお、ランプ使用時間の更新・保存は、ランプ１０２を消灯させるときだけではなく、予め規定されたランプ使用時間の更新時間に基づいて更新・保存してもよい。また、制御部１０６は、ＤＣＩプロジェクター１０１の動作中（ランプ１０２の点灯中）は、ランプ制御装置１０４から所定の時間毎にランプ電圧の値を取得して更新・保存する。 When the power switch 108 is turned on and the lamp control device 104 lights the lamp 102, the control unit 106 starts measuring the lighting time of the lamp 102 using a timer, and the power switch 108 is turned off and the lamp control device 104 is turned off. When the lamp 102 is turned off by the above, the measurement using the timer is stopped and the lighting time of the lamp 102 is obtained. Thereafter, the obtained lighting time of the lamp 102 is added to the lamp usage time stored in the nonvolatile memory, and the value after the addition is updated and stored as a new lamp usage time. The lamp usage time may be updated / stored not only when the lamp 102 is turned off, but also based on a predetermined update time of the lamp usage time. Further, the control unit 106 acquires, updates, and stores the value of the lamp voltage from the lamp control device 104 every predetermined time during the operation of the DCI projector 101 (while the lamp 102 is lit).
　図３は、本発明のランプ交換検出方法の処理手順の一例を示すフローチャートである。 FIG. 3 is a flowchart showing an example of the processing procedure of the lamp replacement detection method of the present invention.
　図３では、図２に示したＤＣＩプロジェクター１０１を例にして本発明のランプ交換検出方法の処理手順を示すが、本発明のランプ交換検出方法は、ランプを備えた、どのような構成のプロジェクターにも適用可能である。 FIG. 3 shows the processing procedure of the lamp replacement detection method of the present invention taking the DCI projector 101 shown in FIG. 2 as an example. The lamp replacement detection method of the present invention is a projector having any configuration including a lamp. It is also applicable to.
　図３に示すように、制御部１０６は、ＤＣＩプロジェクター１０１の電源スイッチ１０８がオンされ、ランプ１０２を点灯させてＤＣＩプロジェクター１０１の動作を開始させると、ランプ１０２の点灯時間の計測を開始する（ステップＳ１）。 As shown in FIG. 3, when the power switch 108 of the DCI projector 101 is turned on and the operation of the DCI projector 101 is started by turning on the lamp 102, the control unit 106 starts measuring the lighting time of the lamp 102 ( Step S1).
　続いて、制御部１０６は、ＳＰＢ１０５から該ＳＰＢ１０５で保存されたＳＰＢ情報を取得し、該ＳＰＢ情報に上記カバー開閉情報が含まれているか否か、すなわち情報保持部５でカバー開閉情報が保存されているか否かを確認する（ステップＳ２）。 Subsequently, the control unit 106 acquires the SPB information stored in the SPB 105 from the SPB 105, and whether or not the cover opening / closing information is included in the SPB information, that is, the cover opening / closing information is stored in the information holding unit 5. It is confirmed whether it is (step S2).
　ＳＰＢ１０５でカバー開閉情報が保存されていない場合、制御部１０６は、ステップＳ６の処理へ移行し、所定の周期毎にランプ制御装置１０４からランプ電圧の値を取得して更新・保存する。 When the cover opening / closing information is not stored in the SPB 105, the control unit 106 proceeds to the process of step S6, acquires the value of the lamp voltage from the lamp control device 104 at every predetermined cycle, and updates / saves it.
　ＳＰＢ１０５でカバー開閉情報が保存されている場合、ＤＣＩプロジェクター１０１の電源停止中にランプ１０２が交換された可能性がある。そこで、制御部１０６は、ランプ制御装置１０４から現在のランプ電圧の値（以下、「第１ランプ電圧値」と称す）を取得する（ステップＳ３）。 If the cover opening / closing information is stored in the SPB 105, the lamp 102 may have been replaced while the DCI projector 101 is powered off. Therefore, the control unit 106 acquires the current lamp voltage value (hereinafter referred to as “first lamp voltage value”) from the lamp control device 104 (step S3).
　上述したように、ランプ電圧の値はランプ１０２の点灯時間が経過する共に高くなる傾向にある。そのため、上記第１のランプ電圧値と、ＤＣＩプロジェクター１０１の電源停止前に保存していたランプ電圧の値（以下、「第２ランプ電圧値」と称す）とを比較し、第１のランプ電圧値が第２ランプ電圧値よりも低い場合、ＤＣＩプロジェクター１０１の電源停止中にランプ１０２が新しいものに交換されたと判別できる。 As described above, the value of the lamp voltage tends to increase as the lighting time of the lamp 102 elapses. Therefore, the first lamp voltage value is compared with the lamp voltage value stored before the DCI projector 101 is turned off (hereinafter referred to as “second lamp voltage value”), and the first lamp voltage is compared. When the value is lower than the second lamp voltage value, it can be determined that the lamp 102 has been replaced with a new one while the power of the DCI projector 101 is stopped.
　制御部１０６は、第１のランプ電圧値が第２ランプ電圧値よりも低いか否かを判定し（ステップＳ４）、第１のランプ電圧値が第２ランプ電圧値よりも低い場合はランプ１０２が新しいものに交換されたと判定して、保存しているランプ使用時間の値をリセットして更新・保存する（ステップＳ５）。このとき、制御部１０６は、測定誤差やランプ温度による差異等を考慮して、例えば第１のランプ電圧値と第２ランプ電圧値とが所定の電圧差以上である場合にランプ１０２が交換されたと判定してもよい。 The control unit 106 determines whether or not the first lamp voltage value is lower than the second lamp voltage value (step S4). If the first lamp voltage value is lower than the second lamp voltage value, the lamp 102 is determined. Is replaced with a new one, and the stored lamp usage time value is reset and updated / saved (step S5). At this time, the control unit 106 considers a measurement error, a difference due to a lamp temperature, and the like, and the lamp 102 is replaced when, for example, the first lamp voltage value and the second lamp voltage value are equal to or larger than a predetermined voltage difference. It may be determined that
　一方、第１のランプ電圧値が第２ランプ電圧値以上である場合、制御部１０６は、ランプ１０２が交換されていないと判定する。続いて、制御部１０６は、ステップＳ６の処理へ移行し、所定の時間毎にランプ制御装置１０４からランプ電圧の値を取得して更新・保存する。 On the other hand, when the first lamp voltage value is greater than or equal to the second lamp voltage value, the control unit 106 determines that the lamp 102 has not been replaced. Subsequently, the control unit 106 proceeds to the process of step S6, acquires the value of the lamp voltage from the lamp control device 104 at every predetermined time, and updates / saves it.
　その後、ＤＣＩプロジェクター１０１の電源スイッチ１０８がオフされると、制御部１０６は、ランプ１０２を消灯させると共に、ステップＳ１で開始したタイマを用いた計測を終了してランプ１０２の点灯時間を求め、求めたランプ１０２の点灯時間を不揮発性メモリで保存しているランプ使用時間に加算し、加算後の値を新たなランプ使用時間として更新・保存する（ステップＳ８）。 Thereafter, when the power switch 108 of the DCI projector 101 is turned off, the control unit 106 turns off the lamp 102, ends the measurement using the timer started in step S1, obtains the lighting time of the lamp 102, and obtains it. The lighting time of the lamp 102 is added to the lamp usage time stored in the nonvolatile memory, and the value after the addition is updated and stored as a new lamp usage time (step S8).
　上述したように、ＤＣＩプロジェクター１０１は、ＳＰＢ１０５が定義する上記ＳＰＢ境界にランプドア１０３に設けたスイッチ１０７を含め、ＤＣＩプロジェクター１０１の電源停止中にランプドア１０３が開いた場合は、その旨を示すカバー開閉情報をＳＰＢ情報としてＳＰＢ１０５で保存する。また、ランプドア１０３が開いた場合、制御部１０６が電源再開後のランプ電圧の値（第１のランプ電圧値）とＤＣＩプロジェクター１０１の電源停止前に保存していたランプ電圧（第２のランプ電圧値）とを比較することでランプ１０２が新しいものに交換されたか否かを判定する。 As described above, the DCI projector 101 includes the switch 107 provided on the lamp door 103 at the SPB boundary defined by the SPB 105. When the lamp door 103 is opened while the power of the DCI projector 101 is stopped, the cover opening / closing indicating that effect is performed. Information is stored in the SPB 105 as SPB information. When the lamp door 103 is opened, the control unit 106 determines the lamp voltage value (first lamp voltage value) after the power supply restarts and the lamp voltage (second lamp voltage) stored before the DCI projector 101 is powered off. Value) to determine whether or not the lamp 102 has been replaced with a new one.
　以上説明したように、図２に示すＤＣＩプロジェクター１０１でも、電源停止中にカバー１０３が開いたか否かを判定し、カバー１０３が開いたと判定すると、電源再開後に取得したランプ電圧と電源停止前に保存していたランプ電圧とを比較してランプ１０２が交換されたか否かを判定するので、ランプ１０２の交換の有無を容易に判別できる。 As described above, even in the DCI projector 101 shown in FIG. 2, it is determined whether or not the cover 103 is opened while the power supply is stopped. Since it is determined whether or not the lamp 102 has been replaced by comparing with the stored lamp voltage, it is possible to easily determine whether or not the lamp 102 has been replaced.
　また、図２に示すＤＣＩプロジェクター１０１に本発明を適用すれば、ＳＰＢ１０５を用いて情報保持部５を実現できるので、プロジェクターのコストの上昇をさらに抑制しつつ、ランプが交換されたことを検出することができる。また、該検出した結果に基づいて保存しているランプ使用時間をリセットできる。 Further, if the present invention is applied to the DCI projector 101 shown in FIG. 2, the information holding unit 5 can be realized using the SPB 105, so that it is detected that the lamp has been replaced while further suppressing an increase in the cost of the projector. be able to. Further, the stored lamp usage time can be reset based on the detected result.
　なお、上述した説明では、カバー３が開けられると、カバー３が開いたことを示すカバー開閉情報を情報保持部５で保存する例を示したが、カバー開閉情報はカバー３の開閉に関する情報としてもよい。例えば、カバー開閉情報をカバー３が開けられたか否かを示す情報とした場合、制御部１０６は保存されているカバー開閉情報が、カバー３が開けられたことを示す場合、カバー３が開けられたと判定すればよい。この場合、制御部１０６は、ランプ使用時間の値をリセットすると、情報保持部５にその旨を通知する。情報保持部５は、該通知を受け取ると、カバー開閉情報をカバー３が開けられていないことを示す情報に更新して保存する。 In the above description, when the cover 3 is opened, the cover opening / closing information indicating that the cover 3 is opened is stored in the information holding unit 5. However, the cover opening / closing information is information on opening / closing of the cover 3. Also good. For example, when the cover opening / closing information is information indicating whether or not the cover 3 is opened, the control unit 106 opens the cover 3 when the stored cover opening / closing information indicates that the cover 3 is opened. What is necessary is just to judge. In this case, when the value of the lamp usage time is reset, the control unit 106 notifies the information holding unit 5 to that effect. When the information holding unit 5 receives the notification, the information holding unit 5 updates and stores the cover opening / closing information to information indicating that the cover 3 is not opened.
　また、上述した説明では、ランプ２が点灯された後にカバー３が開けられたか否かを判定する例を示したが、カバー３が開けられたか否かは、プロジェクター１に所要の電源電圧の供給が再開された後、ランプ２を点灯される前に判定してもよい。 In the above description, an example in which it is determined whether or not the cover 3 has been opened after the lamp 2 has been turned on has been shown, but whether or not the cover 3 has been opened depends on the supply of a required power supply voltage to the projector 1. After restarting, it may be determined before the lamp 2 is turned on.
　また、上述した説明では、ランプ制御回路４がランプ電圧を測定するランプ電圧検出部１１を備え、制御部６はランプ制御回路４からランプ電圧を取得する例を示したが、ランプ電圧検出部１１はランプ制御回路４の外部にあってもよい。その場合、制御部６は該ランプ電圧検出部１１からランプ電圧を取得すればよい。 In the above description, the lamp control circuit 4 includes the lamp voltage detection unit 11 that measures the lamp voltage, and the control unit 6 acquires the lamp voltage from the lamp control circuit 4. May be external to the lamp control circuit 4. In that case, the control unit 6 may acquire the lamp voltage from the lamp voltage detection unit 11.
　以上、実施形態を参照して本願発明を説明したが、本願発明は上記実施形態に限定されものではない。本願発明の構成や詳細は本願発明のスコープ内で当業者が理解し得る様々な変更が可能である。 As mentioned above, although this invention was demonstrated with reference to embodiment, this invention is not limited to the said embodiment. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

Claims (8)

  1. 　ランプを備えたプロジェクターであって、
    　前記ランプを交換するときに開閉されるカバーと、
    　前記カバーが開いたか否かを検出するカバー検出部と、
    　前記ランプが点灯しているときに前記ランプへ印加するランプ電圧を検出するランプ電圧検出部と、
    　前記プロジェクターが電源停止状態において、前記カバーが開くと、前記カバーが開いたことを示すカバー開閉情報を保存する、補助電源を備えた情報保持部と、
    　前記ランプが点灯すると前記ランプの点灯時間を計測し、該点灯時間の積算値であるランプ使用時間を保存すると共に、前記ランプ電圧検出部から所定の時間毎に前記ランプ電圧を取得して更新保存し、前記プロジェクターの電源停止状態から電源再開の後、前記情報保持部に保存された前記カバー開閉情報が前記カバーが開いたことを示すか否かを判定し、前記カバーが開いたことを示す場合は、前記ランプ電圧検出部から電源再開後に検出されたランプ電圧を取得し、該取得したランプ電圧が前記プロジェクターの電源停止前に保存していたランプ電圧よりも低い場合は前記ランプが交換されたと判定する制御部と、
    を有するプロジェクター。     A projector with a lamp,
    A cover that is opened and closed when the lamp is replaced;
    A cover detector for detecting whether or not the cover is opened;
    A lamp voltage detector for detecting a lamp voltage applied to the lamp when the lamp is lit;
    An information holding unit with an auxiliary power source that stores cover opening / closing information indicating that the cover is opened when the cover is opened when the projector is in a power stop state;
    When the lamp is turned on, the lamp lighting time is measured, and the lamp usage time, which is an integrated value of the lighting time, is stored, and the lamp voltage is acquired from the lamp voltage detection unit every predetermined time and updated and stored. Then, after restarting the power supply from the power stop state of the projector, it is determined whether or not the cover opening / closing information stored in the information holding unit indicates that the cover has been opened, and indicates that the cover has been opened. In this case, the lamp voltage detected after the power supply is restarted is acquired from the lamp voltage detection unit, and the lamp is replaced when the acquired lamp voltage is lower than the lamp voltage stored before the power supply of the projector is stopped. A control unit for determining that
    Projector.
  2. 　請求項１に記載のプロジェクターにおいて、
    　前記カバー開閉情報は、前記カバーの開閉があったことを示す情報であり、
    　前記制御部は、前記情報保持部で前記カバー開閉情報が保存されているか否かを判定し、前記カバー開閉情報が保存されている場合は、前記ランプ電圧検出部から電源再開後に検出されたランプ電圧を取得し、該取得したランプ電圧が前記プロジェクターの電源停止前に保存していたランプ電圧よりも低い場合は前記ランプが交換されたと判定するプロジェクター。     The projector according to claim 1.
    The cover opening / closing information is information indicating that the cover has been opened / closed,
    The control unit determines whether or not the cover opening / closing information is stored in the information holding unit. When the cover opening / closing information is stored, the lamp detected from the lamp voltage detection unit after the power supply is restarted. A projector that acquires a voltage and determines that the lamp has been replaced when the acquired lamp voltage is lower than a lamp voltage stored before the power of the projector is stopped.
  3. 　請求項１または２に記載のプロジェクターにおいて、
    　前記制御部は、
    　前記プロジェクターの電源停止中に前記ランプが交換されたと判定した場合、前記ランプ使用時間の値をリセットするプロジェクター。     The projector according to claim 1 or 2,
    The controller is
    A projector that resets the value of the lamp usage time when it is determined that the lamp has been replaced while the power of the projector is stopped.
  4. 　請求項１から３のいずれか１項に記載のプロジェクターにおいて、
    　前記情報保持部は、
    　ＤＣＩ（Digital Cinema Initiatives）規格に対応するセキュアプロセッシングブロックであるプロジェクター。     The projector according to any one of claims 1 to 3,
    The information holding unit
    A projector that is a secure processing block that supports the DCI (Digital Cinema Initiatives) standard.
  5. 　プロジェクターが、
    　ランプと、
    　前記ランプを交換するときに開閉されるカバーと、
    　前記カバーが開いたか否かを検出するカバー検出部と、
    　前記ランプが点灯しているときに前記ランプへ印加するランプ電圧を検出するランプ電圧検出部と、
    　補助電源を備えた情報保持部と、
    　前記プロジェクターの動作を制御する制御部と、
    を備え、
    　前記情報保持部が、
    　前記プロジェクターが電源停止状態において、前記カバー検出部により前記カバーが開いたことが検出されると、前記カバーが開いたことを示すカバー開閉情報を保存し、
    　前記制御部が、
    　前記ランプが点灯すると前記ランプの点灯時間を計測し、該点灯時間の積算値であるランプ使用時間を保存すると共に、前記ランプ電圧検出部から所定の時間毎に前記ランプ電圧を取得して更新保存し、
    　前記プロジェクターの電源停止状態から電源再開の後、前記情報保持部に保存された前記カバー開閉情報が前記カバーが開いたことを示すか否かを判定し、
    　前記カバーが開いたことを示す場合は、前記ランプ電圧検出部から電源再開後に検出されたランプ電圧を取得し、
    　該取得したランプ電圧が前記プロジェクターの電源停止前に保存していたランプ電圧よりも低い場合は前記ランプが交換されたと判定するプロジェクターのランプ交換検出方法。     The projector
    A lamp,
    A cover that is opened and closed when the lamp is replaced;
    A cover detector for detecting whether or not the cover is opened;
    A lamp voltage detector for detecting a lamp voltage applied to the lamp when the lamp is lit;
    An information holding unit with an auxiliary power source;
    A control unit for controlling the operation of the projector;
    With
    The information holding unit is
    When the projector is in a power-off state, when the cover detection unit detects that the cover is opened, it stores cover opening / closing information indicating that the cover is opened,
    The control unit is
    When the lamp is turned on, the lamp lighting time is measured, and the lamp usage time, which is an integrated value of the lighting time, is stored, and the lamp voltage is acquired from the lamp voltage detection unit every predetermined time and updated and stored. And
    Determining whether the cover opening / closing information stored in the information holding unit indicates that the cover has been opened after restarting the power supply from the power stop state of the projector;
    When indicating that the cover has been opened, obtain the lamp voltage detected after the power supply resumed from the lamp voltage detection unit,
    A lamp replacement detection method for a projector, which determines that the lamp has been replaced when the acquired lamp voltage is lower than the lamp voltage stored before the power of the projector is stopped.
  6. 　請求項５に記載のプロジェクターのランプ交換検出方法において、
    　前記カバー開閉情報は、前記カバーの開閉があったことを示す情報であり、
    　前記制御部が、
    　前記情報保持部で前記カバー開閉情報が保存されているか否かを判定し、
    　前記カバー開閉情報が保存されている場合は、前記ランプ電圧検出部から電源再開後に検出されたランプ電圧を取得し、
    　該取得したランプ電圧が前記プロジェクターの電源停止前に保存していたランプ電圧よりも低い場合は前記ランプが交換されたと判定するプロジェクターのランプ交換検出方法。     The lamp replacement detection method for a projector according to claim 5,
    The cover opening / closing information is information indicating that the cover has been opened / closed,
    The control unit is
    Determining whether the cover opening / closing information is stored in the information holding unit;
    If the cover open / close information is stored, obtain the lamp voltage detected after restarting the power from the lamp voltage detector,
    A lamp replacement detection method for a projector, which determines that the lamp has been replaced when the acquired lamp voltage is lower than the lamp voltage stored before the power of the projector is stopped.
  7. 　請求項５または６に記載のプロジェクターのランプ交換検出方法において、
    　前記制御部が、
    　前記プロジェクターの電源停止中に前記ランプが交換されたと判定した場合、前記ランプ使用時間の値をリセットするプロジェクターのランプ交換検出方法。     The lamp replacement detection method for a projector according to claim 5 or 6,
    The control unit is
    A lamp replacement detection method for a projector, wherein the lamp usage time value is reset when it is determined that the lamp has been replaced while the power of the projector is stopped.
  8. 　請求項５から７のいずれか１項に記載のプロジェクターのランプ交換検出方法において、
    　前記情報保持部に、ＤＣＩ（Digital Cinema Initiatives）規格に対応するセキュアプロセッシングブロックを用いるプロジェクターのランプ交換検出方法。     The lamp replacement detection method for a projector according to any one of claims 5 to 7,
    A lamp replacement detection method for a projector, wherein a secure processing block corresponding to a DCI (Digital Cinema Initiatives) standard is used for the information holding unit.
PCT/JP2013/061251 2013-04-16 2013-04-16 Projector and lamp change detection method thereof WO2014170951A1 (en)

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