WO2012025989A1 - プロジェクタおよびフィルタの交換時期予測方法 - Google Patents
プロジェクタおよびフィルタの交換時期予測方法 Download PDFInfo
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- WO2012025989A1 WO2012025989A1 PCT/JP2010/064245 JP2010064245W WO2012025989A1 WO 2012025989 A1 WO2012025989 A1 WO 2012025989A1 JP 2010064245 W JP2010064245 W JP 2010064245W WO 2012025989 A1 WO2012025989 A1 WO 2012025989A1
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- WIPO (PCT)
- Prior art keywords
- time
- temperature
- temperature difference
- filter
- projector
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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
- G03B21/16—Cooling; Preventing overheating
Definitions
- the present invention relates to a projector, and more particularly, to a projector including a filter and a filter replacement time prediction method.
- Patent Document 1 describes a projector including a filter device.
- a projector described in Patent Document 1 includes a housing, a filter device having a fan and a filter for cooling the housing, an integration unit that integrates the operation time of the filter device to calculate an operation time integration result, and a display unit. It is equipped with.
- the filter replacement time is indicated on the display unit based on the operation time integration result calculated by the integration unit.
- the filter replacement time is indicated on the display means based on the operation time integration result of the filter device.
- the filter replacement time depends on the size and amount of dust floating around the projector.
- the filter device operates in an environment where many dust particles smaller than the hole diameter of the holes existing in the filter are floating around the projector, the dust gradually accumulates on the wall surfaces of the holes. It takes time to seal the holes.
- a projector that operates in an environment where a large number of dust particles that are approximately the same size as the filter hole diameter is floating is operated in an environment where many dust particles smaller than the filter hole diameter are floating.
- the filter is clogged earlier than the projector that does this.
- the temperature inside the projector will exceed the allowable upper limit temperature at the filter replacement time, and in the worst case the projector will fail. May end up.
- the time at which the filter is clogged may not be predicted correctly depending on the size and amount of dust floating around the projector.
- the projector may become clogged, the temperature inside the projector may exceed the allowable upper limit temperature, and the projector may break down.
- the projector according to the present invention is a projector including a housing, a filter provided in the housing, a processing unit provided in the housing, and a lamp that generates heat by emitting light.
- External detection means for detecting an external temperature outside the processing means has an internal detection means for detecting an internal temperature in the vicinity of the lamp, and a predetermined limit temperature T lm for avoiding an abnormal temperature of the lamp.
- the first time When not exceeding, the first time is output, and when the time change rate exceeds a predetermined threshold, the time change rate exceeding the predetermined threshold and the temperature difference ⁇ T acquired last. And a calculation means for calculating and outputting a second time indicating the replacement time of the filter based on the last calculated limit temperature difference ⁇ T lm, and a first time or a second time output by the calculation means And notifying means for notifying the time as a filter replacement time.
- the filter replacement time prediction method of the present invention detects a housing, a filter provided in the housing, a lamp provided in the housing and generating heat by emitting light, and an external temperature outside the housing.
- the present invention it is possible to predict the replacement time of the filter according to the installation environment of the projector.
- FIG. 3 is a diagram showing a cooling mechanism used in the projector 10. It is a figure for demonstrating the acquisition method of the temperature difference by the control part. It is a figure for demonstrating the calculation method of the replacement time of the filter. It is a figure which shows the example which calculates
- FIG. 3 is a diagram showing a cooling mechanism used in the projector 10. It is a figure for demonstrating the acquisition method of the temperature difference by the control part. It is a figure for demonstrating the calculation method of the replacement time of the filter. It is a figure which shows the example which calculates
- FIG. 5 is a flowchart showing a method for predicting the replacement time of the filter 3. It is a figure which shows the temperature characteristic when the rapid change of the raise rate of a temperature difference is detected and the rotation speed of the fan 2 is raised.
- FIG. 1 is a block diagram showing a projector in an embodiment of the present invention.
- the projector 10 When the projector 10 receives an image signal indicating an image from the signal circuit 90, the projector 10 is a projection display device that displays an image indicated by the image signal on a screen.
- the projector 10 includes a housing 1 having an intake port and an exhaust port, a filter 3 provided in the housing 1, a lamp 11, a display device 12, a lens 13, and a processing unit 20.
- the lamp 11, the display device 12, the lens 13, and the processing unit 20 are provided in the housing 1.
- the lamp 11 is a light source that emits light.
- the lamp 11 generates heat by emitting light.
- the lamp 11 is realized by a high-pressure mercury lamp, for example.
- the lamp 11 emits light to the display device 12.
- the display device 12 When receiving the image signal from the signal circuit 90, the display device 12 modulates the light emitted from the lamp 11 based on the image signal.
- the display device 12 is realized by a spatial light modulation panel such as a transmissive liquid crystal panel, a reflective liquid crystal panel (Liquid Crystal On Silicon: LCOS), or a DMD (Digital Micromirror Device) panel.
- a spatial light modulation panel such as a transmissive liquid crystal panel, a reflective liquid crystal panel (Liquid Crystal On Silicon: LCOS), or a DMD (Digital Micromirror Device) panel.
- the lens 13 projects the light output from the display device 12 onto the screen as an image.
- the processing unit 20 can generally be called processing means.
- the processing unit 20 predicts and displays the replacement time of the filter 3.
- the processing unit 20 includes a temperature sensor 21, a control unit 23, and a display unit 25.
- the control unit 23 includes a memory 24.
- FIG. 2 is a diagram showing a cooling mechanism used in the projector 10.
- the cooling mechanism used in the projector 10 includes a fan 2, a filter 3, a temperature sensor 21, and a temperature sensor 22.
- the fan 2 is used for cooling the lamp 11.
- the fan 2 sucks air from the air inlet of the housing 1 through the filter 3 and blows the air to the lamp 11. As shown in FIG. 1, the air blown to the lamp 11 is exhausted from the exhaust port of the housing 1.
- Filter 3 is a replaceable filter.
- the filter 3 is provided so as to cover the intake port of the housing 1.
- the filter 3 captures dust and dirt floating outside the housing 1.
- the temperature sensor 21 can generally be called an internal detection means.
- the temperature sensor 21 detects the internal temperature near the lamp 11. As shown in FIG. 1, the temperature sensor 21 detects an internal temperature and supplies an internal detection signal indicating the internal temperature to the control unit 23.
- the temperature sensor 22 can generally be called an external detection means.
- the temperature sensor 22 is provided in the housing 1 and detects an external temperature (outside air temperature) outside the housing 1.
- the temperature sensor 22 is provided in a place where the influence of heat generated by the lamp 11 is small, for example. As shown in FIG. 1, the temperature sensor 22 detects an external temperature and supplies an external detection signal indicating the external temperature to the control unit 23.
- the memory 24 holds lamp temperature information indicating a predetermined limit temperature T lm for avoiding a temperature abnormality of the lamp 11.
- the control unit 23 can generally be called a calculation means.
- the controller 23 calculates a limit temperature difference ⁇ T lm that is a difference between a predetermined limit temperature T lm indicated in the lamp temperature information and the external temperature detected by the temperature sensor 22 for each predetermined period.
- the control unit 23 acquires a temperature difference ⁇ T between the internal temperature detected by the temperature sensor 21 and the external temperature detected by the temperature sensor 22 for each predetermined period in which the limit temperature difference ⁇ T lm is calculated.
- the control unit 23 calculates a first time indicating the replacement time of the filter 3 based on the temperature difference ⁇ T acquired during the predetermined period and the calculated limit temperature difference ⁇ T lm .
- control unit 23 obtains a first linear approximation expression that represents the relationship between the temperature difference ⁇ T and time using the temperature difference ⁇ T acquired during a predetermined period.
- the control unit 23 calculates the first time by calculating the time represented by the first linear approximation formula in relation to the limit temperature difference ⁇ T lm acquired during the predetermined period. To do.
- control unit 23 After calculating the first time indicating the replacement time of the filter 3, the control unit 23 obtains the time change rate of the temperature difference for each predetermined period using the previously acquired temperature difference ⁇ T.
- the control unit 23 When the control unit 23 obtains the time change rate of the temperature difference for each predetermined period, it checks whether the time change rate has exceeded a predetermined threshold.
- the predetermined threshold is a threshold for detecting a large change in the slope of the first linear approximation formula, and is, for example, a value obtained by adding a predetermined value to the time change rate obtained first or immediately before.
- the predetermined threshold value is referred to as a detection threshold value in the present embodiment.
- the control unit 23 outputs the first time to the display unit 25 when the time change rate does not exceed the detection threshold.
- the control unit 23 is based on the time change rate exceeding the detection threshold, the last acquired limit temperature difference, and the last acquired temperature difference.
- the second time indicating the replacement time of the filter 3 is calculated and output to the display unit 25.
- the control unit 23 calculates the second time by multiplying the time change rate exceeding the detection threshold by the value obtained by subtracting the last acquired temperature difference from the last acquired limit temperature difference. .
- control unit 23 measures the accumulated usage time of the fan 2.
- the controller 23 calculates a limit temperature difference ⁇ T lm by subtracting the external temperature detected by the temperature sensor 22 from the limit temperature T lm of the lamp 11 every predetermined period, and the temperature sensor 21 detects every predetermined period.
- a temperature difference ⁇ T obtained by subtracting the external temperature detected by the temperature sensor 22 from the internal temperature is acquired.
- control unit 23 stores the temperature difference and the accumulated usage time measured when the temperature difference is acquired in the memory 24 in association with each other.
- the control unit 23 When the temperature difference and the accumulated use time measured when the temperature difference is acquired are stored, the control unit 23 accumulates using the accumulated use time stored in the memory 24 and the temperature difference ⁇ T of the accumulated use time. A first linear approximation expression representing the relationship between the usage time and the temperature difference ⁇ T is obtained.
- the control unit 23 calculates the cumulative usage time represented by the relationship with the limit temperature difference ⁇ T lm by the first linear approximation formula.
- the controller 23 calculates the cumulative usage time represented by the first linear approximation formula, the first time obtained by subtracting the cumulative usage time measured when the temperature difference was last acquired from the cumulative usage time, This is calculated as the replacement time of the filter 3.
- the control unit 23 When calculating the first time, the control unit 23 generates first replacement time information indicating the first time, and supplies the replacement time information to the display unit 25. Thereafter, whenever the temperature difference is acquired, the control unit 23 stores the temperature difference and the accumulated usage time measured at the time of acquiring the temperature difference in the memory 24 in association with each other.
- control unit 23 When the control unit 23 stores the temperature difference and the accumulated usage time measured at the time of acquiring the temperature difference, the control unit 23 uses the accumulated usage time stored in the memory 24 and the temperature difference between the accumulated usage times for each predetermined period. The time change rate of the temperature difference is obtained, and it is confirmed whether the time change rate has exceeded the detection threshold.
- the control unit 23 outputs the first replacement time information representing the first time to the display unit 25 when the time change rate does not exceed the detection threshold.
- the control unit 23 calculates the time change rate exceeding the detection threshold and a value obtained by subtracting the last acquired temperature difference from the last acquired limit temperature difference. Multiplication is performed to calculate a second time indicating the replacement time of the filter 3.
- the control unit 23 calculates the second time indicating the replacement time of the filter 3
- the control unit 23 outputs the second replacement time information indicating the second time to the display unit 25.
- control unit 23 displays notification information instructing that the replacement time of the filter 3 has been changed from the first time to the second time. To the unit 25.
- the display unit 25 can be generally referred to as notification means.
- the display unit 25 notifies the first time or the second time output by the control unit 23 as the filter replacement time.
- the display unit 25 changes the replacement time of the filter 3 from the first time to the second time. Notify that.
- a liquid crystal screen is used as the display unit 25.
- the display unit 25 receives the first replacement time information from the control unit 23, the display unit 25 displays the first time indicated in the first replacement time information as the replacement time of the filter 3.
- the display unit 25 When receiving the notification information from the control unit 23, the display unit 25 displays that the replacement time of the filter 3 has been advanced. When the display unit 25 receives the second replacement time information from the control unit 23, the display unit 25 displays the second time indicated in the second replacement time information as the replacement time of the filter 3.
- the display unit 25 displays the replacement time of the filter 3 and the fact that the replacement time of the filter 3 has been advanced has been described, but the user is notified using voice. May be.
- FIG. 3 is a diagram for explaining a technique for acquiring a temperature difference by the control unit 23.
- FIG. 3 is a diagram showing a temperature characteristic of a detection difference between the internal temperature and the external temperature after the projector 10 is started up.
- the vertical axis represents a detection difference between the internal temperature detected by the temperature sensor 21 and the external temperature detected by the temperature sensor 22, and the horizontal axis represents a usage time after the projector 10 is activated (ON). is there.
- the temperature characteristic 3a when the new filter 3 is used is indicated by a solid line
- the temperature characteristic 3b when the filter 3 in which clogging has progressed to some extent is indicated by a dotted line.
- a saturation temperature difference ⁇ T1 of the temperature characteristic 3a and a saturation temperature difference ⁇ T2 of the temperature characteristic 3b are shown.
- the saturation temperature difference ⁇ T2 of the temperature characteristic 3b is larger than the saturation temperature difference ⁇ T1 of the temperature characteristic 3a. Therefore, as the clogging of the filter 3 progresses, the saturation temperature difference ⁇ T increases, so that the clogging state of the filter 3 can be grasped by obtaining the saturation temperature difference ⁇ T.
- the control unit 23 when receiving the internal temperature signal and the external temperature signal, acquires a temperature difference between the internal temperature indicated by the internal temperature signal and the external temperature indicated by the external temperature signal. A method for obtaining the temperature difference ⁇ T will be described below.
- control unit 23 has a saturation threshold for determining whether or not the detection difference ⁇ T d, which is the difference between the internal temperature and the external temperature after the projector 10 is started, has become a stable state.
- Control unit 23 acquires the detected difference [Delta] T d between the inside temperature and the outside temperature after activation of the projector 10, the detection difference [Delta] T d and the detected difference [Delta] T d obtained from the acquisition of the detected difference after a predetermined detection period ⁇ t It is confirmed whether or not the fluctuation amount ⁇ T m is less than the saturation threshold.
- the control unit 23 When the control unit 23 confirms that the fluctuation amount ⁇ T m is less than the saturation threshold, the control unit 23 obtains the detection difference ⁇ T d acquired after the predetermined detection period ⁇ t as the temperature difference ⁇ T between the internal temperature and the external temperature (hereinafter “saturation temperature difference” ").
- control unit 23 can accurately acquire the temperature difference according to the clogging of the filter 3.
- FIG. 4 is a diagram for explaining a method for calculating the replacement time of the filter 3.
- FIG. 4 shows the relationship between the saturation temperature difference ⁇ T and the cumulative usage time t of the projector 10.
- the vertical axis represents the saturation temperature difference ⁇ T
- the horizontal axis represents the cumulative usage time of the projector 10.
- FIG. 4 shows saturation temperature difference points p1 to p7, approximate line ln, saturation temperature differences ⁇ T1 and ⁇ T2, limit temperature difference ⁇ T lm of lamp 11, and filter 3 replacement time t0.
- Saturation temperature difference points p1 to p7 indicate saturation temperature differences acquired by the control unit 23 during a predetermined period. That is, the saturation temperature difference points p 1 to p 7 indicate the saturation temperature difference stored in the memory 24.
- the saturation temperature difference point p1 is the saturation temperature difference ⁇ T1 acquired at the cumulative use time t1
- the saturation temperature difference point p7 is the saturation temperature difference ⁇ T2 acquired at the cumulative use time t2.
- the approximate straight line ln indicates a straight line of a linear approximation formula for calculating the replacement time of the filter 3.
- the limit temperature difference ⁇ T lm is a value calculated based on Equation 1.
- the limit temperature difference ⁇ T lm is acquired, for example, when the projector 10 is started in order to suppress the influence of heat generated by the lamp 11.
- T lm T lm -external temperature ⁇ ⁇ ⁇ Equation 1
- T lm is a predetermined limit temperature for avoiding the abnormal temperature of the lamp 11 and is a value obtained by adding a predetermined value (margin) to the allowable upper limit temperature of the lamp 11.
- the external temperature is a temperature detected by the temperature sensor 22.
- the control unit 23 uses the saturation temperature difference points p1 to p7 acquired during a predetermined period to obtain a linear approximation formula of the approximate line ln that represents the relationship between the accumulated use time and the saturation temperature difference, and The replacement time t0 expressed by the relationship with the limit temperature difference ⁇ T lm is calculated by a linear approximation formula. Then, the control unit 23 subtracts the use accumulated time t2 from the replacement time t0 to calculate a first time indicating the replacement time of the filter 3.
- FIG. 5 is a diagram for explaining an example of obtaining a linear approximation formula of the approximate straight line ln using the least square method.
- FIG. 5 shows saturation temperature difference points p11 to p17, approximate line ln, and differences d1 to d7 between saturation temperature difference points p11 to p17 and approximate line ln.
- the control unit 23 obtains a first linear approximation expression using the least square method. Specifically, the control unit 23 calculates the least square error ⁇ shown in Equation 2. Each time the control unit 23 changes the slope or intercept of the approximate straight line ln, the control unit 23 calculates the minimum square error ⁇ and identifies the approximate straight line ln that minimizes the minimum square error ⁇ .
- FIG. 6 is a diagram for explaining an example of obtaining a linear approximation formula of the approximate straight line ln using a plurality of two-point linear formulas.
- FIG. 6 shows saturation temperature difference points a1 to a8, two-point straight lines la1 to la4, and an approximate straight line ln.
- the control unit 23 calculates the average value of the slopes of the two-point straight lines la1 to la4 and the average value of the intercepts of the two-point straight lines la1 to la4, and calculates the slope of the approximate straight line ln as shown in Expression 3.
- the approximate straight line ln is specified with the average value of the slopes of la1 to la4 and the intercept of the approximate line ln as the average value of the intercepts of the straight lines la1 to la4.
- the controller 23 acquires the saturation temperature difference ⁇ T, the saturation temperature difference (for example, the point a8) and the saturation temperature difference (for example, the point a8) acquired three (predetermined) times before the saturation temperature difference. and a two-point linear expression la1 to la4 representing the relationship between the saturation temperature difference and the time.
- control unit 23 calculates the average value of the slopes A 1 to A 4 of the two-point linear equations la1 to la4 for the predetermined period and the intercepts B 1 to B 4 of the two-point linear equations la1 to la4 for the predetermined period. Using the average value, a first linear approximation formula of the approximate line ln is obtained.
- FIG. 7 is a diagram for explaining the types of clogging of the filter 3.
- FIG. 8 is a diagram illustrating temperature characteristics according to the types of clogging of the filter 3.
- FIG. 7 shows a cake formation 31, a standard blockage 32, and a complete blockage 33.
- the saturation temperature difference ⁇ T hardly changes until the accumulated usage time of the filter 3 reaches a certain time.
- the saturation temperature difference ⁇ T increases.
- the saturation temperature difference ⁇ T increases rapidly in a shorter cumulative use time than the cake formation 31 and the standard blockage 32.
- the clogging of the filter 3 is generally considered to occur simultaneously with the cake formation 31, the standard blockage 32, and the complete blockage 33. For this reason, the temperature characteristic due to the use of the filter 3 is generally obtained by the combination of the temperature characteristics shown in FIG.
- FIG. 9 is a diagram for explaining an example of a linear approximation formula calculation method.
- FIG. 9 shows a temperature characteristic 34, an approximate straight line ln1, and an approximate straight line ln2.
- the temperature characteristic 34 is a temperature characteristic indicating the sum of the temperature characteristic of the cake formation 31, the temperature characteristic of the standard blockage 32, and the temperature characteristic of the complete blockage 33 shown in FIG. 8.
- the control unit 23 acquires the saturation temperature difference ⁇ T in a predetermined period from the start of use of the projector 10, and uses the acquired plurality of saturation temperature differences ⁇ T to calculate the accumulated usage time and the saturation temperature difference ⁇ T.
- a first linear approximation formula of the approximate straight line ln1 representing the relationship is obtained, and the accumulated usable time t0 is calculated from the approximate formula of the approximate straight line ln1 as the first time indicating the replacement time of the filter 3.
- FIG. 10 is a diagram showing the relationship between the temperature characteristic 34 and the slope of the tangent line of the temperature characteristic 34.
- FIG. 10 shows the temperature characteristic 34 shown in FIG. 9 and an inclination characteristic 36 representing the tangential inclination characteristic of the temperature characteristic 34.
- the horizontal axis is the time common to the temperature characteristic 34 and the gradient characteristic 36
- the vertical axis of the temperature characteristic 34 is the magnitude of the saturation temperature difference
- the vertical axis of the gradient characteristic 36 is the temperature characteristic 34. Is the slope of the tangent.
- the control part 23 calculates
- the control unit 23 displays on the display unit 25 that the replacement time of the filter 3 has been advanced, and calculates a second time indicating the replacement time of the filter 3.
- FIG. 11 is a flowchart showing an example of a processing procedure of the filter 3 replacement time prediction method.
- FIG. 11 shows a processing procedure after the projector 10 calculates the first time indicating the replacement time of the filter 3.
- the control unit 23 stores the acquired saturation temperature difference ⁇ T and the accumulated usage time at the time of acquisition of the saturation temperature difference ⁇ T in the memory 24 in association with each other. Then, by using the accumulated usage time in the memory 24 and the saturation temperature difference ⁇ T, the time change rate (slope) of the saturation temperature difference is obtained (step S51).
- the control unit 23 When determining the time change rate of the saturation temperature, the control unit 23 confirms whether the time change rate exceeds the detection threshold, that is, whether the slope of the characteristic of the saturation temperature difference ⁇ T is constant (step). S52). Then, when the obtained time change rate exceeds the detection threshold, the display unit 25 displays that the replacement time of the filter 3 has been advanced and notifies the change of the replacement time of the filter 3 (step S54). ).
- control unit 23 calculates the temperature difference acquired last from the time change rate exceeding the detection threshold and the limit temperature difference acquired last.
- a second time t0 indicating the filter replacement time is calculated by multiplying the subtracted value (step S54).
- the control unit 23 may use a time change rate obtained by a saturation temperature difference acquired in a predetermined linear calculation period instead of using the time change rate exceeding the detection threshold.
- control unit 23 calculates the second time t0 indicating the replacement time of the filter 3
- the control unit 23 displays the second time t0 on the display unit 25 (step S55).
- step 52 the controller 23 determines that the obtained time change rate does not exceed the detection threshold, that is, if the slope is constant, the first time t0 indicating the replacement time of the filter 3 is Output to the display unit 25 (step S55).
- the process of step 55 ends, the projector 10 ends a series of processing procedures of the filter 3 replacement time prediction method.
- the projector 10 includes a housing 1, a filter 3 provided in the housing 1, a lamp 11 that generates heat by emitting light, and a temperature sensor 21 that detects an internal temperature in the vicinity of the lamp 11. , And a temperature sensor 22 that detects an external temperature outside the housing 1.
- the control unit 23 has a predetermined limit temperature T lm for avoiding a temperature abnormality of the lamp 11, and a limit temperature difference ⁇ T between the predetermined limit temperature T lm and the external temperature detected by the temperature sensor 22 every predetermined period. lm is calculated. Furthermore, the control unit 23 acquires a temperature difference ⁇ T between the internal temperature detected by the temperature sensor 21 and the external temperature detected by the temperature sensor 22 for each predetermined period. Control unit 23, and the temperature difference [Delta] T obtained in a predetermined period, based on the temperature difference limit [Delta] T lm calculated for the predetermined time period, calculating a first time indicating the replacement timing of the filter 3.
- the projector 10 can predict the replacement time of the filter 3 based on the time characteristic of the temperature difference between the internal temperature detected by the temperature sensor 21 and the external temperature detected by the temperature sensor 22.
- the control unit 23 after calculating the first time, obtains the time change rate of the temperature difference for each predetermined period using the temperature difference acquired previously, and the time change rate is a predetermined threshold value. Check if the limit is exceeded. The control unit 23 outputs the first time when the time change rate does not exceed the predetermined threshold, and exceeds the predetermined threshold when the time change rate exceeds the predetermined threshold. The second time indicating the replacement time of the filter 3 is calculated and output based on the time change rate, the predetermined limit temperature difference, and the newly acquired temperature difference.
- the projector 10 acquires the time characteristic of the temperature difference between the internal temperature detected by the temperature sensor 21 and the external temperature detected by the temperature sensor 22, and gradually adjusts the filter 3 according to the time characteristic of the temperature difference.
- the replacement time can be corrected.
- the time characteristic of the temperature difference of the projector 10 changes depending on the type and amount of dust floating around the projector 10, and the time when the filter 3 is finally clogged changes.
- the projector 10 can accurately predict the replacement time of the filter 3 according to the installation environment of the projector 10.
- the projector 10 used in an environment in which a large number of dusts having the same size as the average pore diameter of a large number of holes existing in the filter 3 are floating has a temperature difference within a relatively short time after being replaced with a new filter 3. A large change in the time change rate is detected, and the replacement time of the filter 3 is corrected according to the time change rate.
- the projector 10 used in an environment where a lot of dust smaller than the hole diameter of the filter 3 is floating is predicted by the projector used in an environment where dust having the same size as the hole diameter of the filter 3 is floating.
- the replacement time of the filter 3 After the replacement time of the filter 3, a large change in the time change rate of the temperature difference is detected, and the replacement time of the filter 3 is corrected according to the time change rate of the temperature difference.
- the projector 10 can correctly predict the time when the filter 3 is clogged by correcting the replacement time of the filter 3 stepwise according to the time characteristic of the temperature difference.
- the projector 10 predicts the replacement time of the filter 3 based on the temperature difference ⁇ T between the internal temperature and the external temperature.
- the replacement time of the filter 3 becomes shorter. For this reason, the replacement time of the filter 3 also varies depending on the external temperature.
- the projector 10 not only detects the internal temperature, but also detects the external temperature, and calculates the replacement time of the filter 3 by using the temperature difference ⁇ T between the internal temperature and the external temperature, so that the replacement of the filter 3 is performed. It becomes possible to predict the time more accurately.
- the controller 23 calculates the filter replacement time based on the temperature difference ⁇ T and the limit temperature difference ⁇ T lm . For this reason, the projector 10 can accurately predict a state in which the internal temperature causes a temperature abnormality of the lamp 11.
- the projector 10 in a situation where the projector 10 is used in an environment where the filter 3 is unlikely to be clogged, the projector 10 has a filter as compared with a situation where the filter 3 is periodically replaced assuming a general installation environment.
- the usable time of the filter 3 can be lengthened. Therefore, it becomes possible to reduce the frequency
- the replacement time of the filter 3 is changed from the first time to the second time. Notify that it has been changed.
- the projector 10 can inform the user of the projector 10 that the replacement time of the filter 3 has been advanced.
- control unit 23 uses the temperature difference ⁇ T acquired during a predetermined period to obtain a linear approximation expression representing the relationship between the temperature difference ⁇ T and time by the least square method, Based on the limit temperature difference ⁇ T lm calculated during the predetermined period, a first time indicating the replacement time of the filter 3 is calculated.
- the projector 10 can accurately approximate the time characteristic of the temperature difference between the internal temperature and the external temperature.
- control part 23 whenever the control part 23 acquires a temperature difference in a predetermined period, it calculates
- the projector 10 can accurately approximate the time characteristic of the temperature difference between the internal temperature and the external temperature.
- the control unit 23 calculates a difference between the predetermined limit temperature T lm and the highest external temperature among the external temperatures detected by the temperature sensor 22 for each predetermined period as the limit temperature difference. For this reason, even in a situation where the projector 10 is used in an environment where the variation in the external temperature is large, the temperature difference between the internal temperature and the external temperature varies due to the variation in the external temperature, and the replacement time of the filter 3 is recalculated. Can be reduced. Therefore, confusion of the user of the projector 10 can be suppressed.
- the control unit 23 determines whether or not the detection difference between the internal temperature detected by the temperature sensor 21 and the external temperature detected by the temperature sensor 22 has become stable after the projector 10 is started. To have a saturation threshold.
- the control unit 23 acquires the detection difference, confirms whether or not the variation amount between the detection difference and the detection difference acquired after the predetermined detection period after acquiring the detection difference is less than the saturation threshold, and the variation amount is When it is confirmed that the value is less than the saturation threshold, the detection difference acquired after the predetermined detection period is acquired as the temperature difference ⁇ T.
- the projector 10 acquires the time difference of the temperature difference in which the clogged state of the filter 3 is correctly reflected by acquiring the temperature difference ⁇ T in a state where the fluctuation of the detection difference between the internal temperature and the external temperature is stable. It becomes possible to do.
- the projector 10 can also extend the replacement time of the filter 3 by controlling the rotational speed of the fan 2.
- the control unit 23 obtains the time change rate of the temperature difference for each predetermined period using the previously acquired temperature difference and confirms whether the time change rate has exceeded the detection threshold.
- the time change rate exceeds the detection threshold, the rotation speed of the fan 2 is changed from the first rotation speed to the second rotation speed higher than the first rotation speed.
- FIG. 12 is a diagram showing the temperature characteristics when the change in the gradient of the temperature difference characteristics is detected and the rotation speed of the fan 2 is increased.
- the temperature characteristic 34 shown in FIG. 9 is indicated by a solid line
- the temperature characteristic 35 is indicated by a broken line.
- the temperature characteristic 35 indicates the temperature characteristic after the rotation speed of the fan 2 is switched from the first rotation speed to the second rotation speed higher than the first rotation speed. In FIG. 12, it is assumed that the time change rate exceeds the detection threshold at the cumulative usage time t3.
- the control unit 23 supplies the fan 2 with a rotation signal indicating the second rotation number, Increase the rotation speed of the fan 2.
- the temperature increase rate of the internal temperature near the lamp 11 is decreased as compared with the temperature characteristic 34. Therefore, as shown in FIG. 12, the accumulated use time t0 in the temperature characteristic 35 is longer than the accumulated use time t0 in the temperature characteristic 34.
- the projector 10 sets the rotation speed of the fan 2 to the second rotation speed, thereby replacing the filter 3. It becomes possible to extend t0.
- the illustrated configuration is merely an example, and the present invention is not limited to the configuration.
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Abstract
Description
特許文献1に記載のプロジェクタでは、積算手段が算出した稼動時間積算結果に基づいて、フィルタの交換時期が表示手段に示される。
なお、Tlmは、ランプ11の異常温度を回避するための所定の限界温度であり、ランプ11の許容上限温度に、予め定められた値(マージン)を加算した値である。外部温度は、温度センサ22が検出した温度である。
+(d5)2+(d6)2+(d7)2+・・・(dn)2
= Σdi 2 ・・・式2
図6は、複数の2点直線式を用いて近似直線lnの直線近似式を求める例を説明するための図である。図6には、飽和温度差点a1~a8と、2点直線la1~la4と、近似直線lnと、が示されている。
点a2と点a6とにより特定された直線la2は、次式で表わされる。
点a3と点a7とにより特定された直線la3は、次式で表わされる。
点a4と点a8とにより特定された直線la4は、次式で表わされる。
制御部23は、2点直線la1~la4の傾きの平均値と、2点直線la1~la4の切片の平均値と、を算出し、式3に示すように、近似直線lnの傾きを、直線la1~la4の傾きの平均値とし、近似直線lnの切片を、直線la1~la4の切片の平均値として、近似直線lnを特定する。
+{(B1+B2+B3+B4)/4} ・・・式3
このため、制御部23は、飽和温度差ΔTを取得するたびに、飽和温度差(例えば、点a8)と、その飽和温度差から3(所定)回前に取得した飽和温度差(例えば、点a4)とを用いて、飽和温度差と時間との関係を表す2点直線式la1~la4を求める。制御部23は、所定期間ごとに、所定期間の2点直線式la1~la4の傾きA1~A4の平均値と、所定期間の2点直線式la1~la4の切片B1~B4の平均値とを用いて、近似直線lnの第1の直線近似式を求める。
ステップ55の処理が終了すると、プロジェクタ10は、フィルタ3の交換時期予測方法の一連の処理手順を終了する。
このため、外部温度の変動が大きな環境でプロジェクタ10が使用される状況でも、外部温度の変動に起因して、内部温度と外部温度との温度差が変動し、フィルタ3の交換時期の再計算が行われてしまうことを減らすことができる。よって、プロジェクタ10の使用者の混乱を抑えることができる。
2 ファン
3 フィルタ
10 プロジェクタ
11 ランプ
12 表示デバイス
13 レンズ
20 処理部
21、22 温度センサ
23 制御部
24 メモリ
25 表示部
Claims (9)
- 筺体と、前記筺体に設けられたフィルタと、前記筺体内に設けられた、処理手段と、光を出射することにより発熱するランプと、を有するプロジェクタであって、
前記筺体外の外部温度を検出する外部検出手段を含み、
前記処理手段は、
前記ランプ近傍の内部温度を検出する内部検出手段と、
前記ランプの温度異常を回避するための所定の限界温度Tlmを有し、所定期間ごとに前記所定の限界温度Tlmと前記外部検出手段が検出した外部温度との限界温度差ΔTlmを算出し、当該所定期間ごとに前記内部検出手段が検出した内部温度と前記外部温度との温度差ΔTを取得し、前記取得した温度差ΔTと、前記算出した限界温度差ΔTlmとに基づいて、前記フィルタの交換時期を示す第1の時間を計算し、その後、以前に取得した温度差ΔTを用いて前記所定期間ごとの温度差の時間変化率を求め、時間変化率が、所定の閾値を超えたかどうかを確認し、時間変化率が所定の閾値を超えていない場合には前記第1の時間を出力し、時間変化率が所定の閾値を超えている場合には、前記所定の閾値を超えている時間変化率と、最後に取得した温度差ΔTと、最後に算出した限界温度差ΔTlmとに基づいて、前記フィルタの交換時期を示す第2の時間を計算して出力する計算手段と、
前記計算手段が出力した第1の時間もしくは第2の時間をフィルタの交換時期として通知する通知手段と、を含む、プロジェクタ。 - 請求項1に記載のプロジェクタにおいて、
前記通知手段は、前記計算手段にて時間変化率が所定の閾値を超えていると確認された場合には前記フィルタの交換時期が前記第1の時間から前記第2の時間に変更となった旨を通知する、プロジェクタ。 - 請求項1または2に記載のプロジェクタにおいて、
前記計算手段は、前記取得した温度差ΔTを用いて、温度差ΔTと時間との関係を表す直線近似式を最小二乗法により求め、前記直線近似式と、前記算出した限界温度差ΔTlmとに基づいて、前記フィルタの交換時期を示す第1の時間を計算する、プロジェクタ。 - 請求項1または2に記載のプロジェクタにおいて、
前記計算手段は、前記所定期間に温度差ΔTを取得するたびに、温度差ΔTと、当該温度差ΔTから所定回数前に取得した温度差ΔTと、を用いて2点直線式を求め、当該所定期間の2点直線式の傾きの平均値と、当該所定期間の2点直線式の切片の平均値と、を用いて直線近似式を求め、前記直線近似式と、前記算出した限界温度差ΔTlmとに基づいて、前記フィルタの交換時期を示す第1の時間を計算する、プロジェクタ。 - 請求項1から4のいずれか1項に記載のプロジェクタにおいて、
前記計算手段は、前記所定の限界温度Tlmと、前記所定期間ごとに前記外部検出手段が検出した外部温度のうち最も高い外部温度との差分を、限界温度差ΔTlmとして算出する、プロジェクタ。 - 請求項1から5のいずれか1項に記載のプロジェクタにおいて、
前記計算手段は、前記プロジェクタの起動後に、前記内部検出手段が検出した内部温度と前記外部温度との検出差が安定状態となったか否かを判定するための飽和閾値を有し、検出差を取得し、検出差と当該検出差を取得してから所定検出期間後に取得した検出差との変動量が前記飽和閾値未満になったかどうかを確認し、変動量が前記飽和閾値未満になったことを確認すると、前記所定検出期間後に取得した検出差を、前記内部検出手段が検出した内部温度と前記外部温度との温度差ΔTとして取得する、プロジェクタ。 - 請求項1から6のいずれか1項に記載のプロジェクタにおいて、
前記筺体内に設けられ、前記ランプを冷却するためのファンをさらに含み、
前記計算手段は、前記以前に取得した温度差を用いて前記所定期間ごとの温度差の時間変化率を求め、時間変化率が所定の閾値を超えたかどうかを確認し、時間変化率が所定の閾値を超えている場合には、前記ファンの回転数を、第1の回転数から当該第1の回転数よりも高い第2の回転数にする、プロジェクタ。 - 筺体と、前記筺体に設けられたフィルタと、前記筺体内に設けられ、光を出射することにより発熱するランプと、前記筺体外の外部温度を検出する外部検出手段と、前記ランプ近傍の内部温度を検出する内部検出手段と、を有するプロジェクタにおけるフィルタの交換時期予測方法であって、
前記ランプの温度異常を回避するための所定の限界温度Tlmを有し、所定期間ごとに前記所定の限界温度Tlmと前記外部検出手段が検出した外部温度との限界温度差ΔTlmを算出し、当該所定期間ごとに前記内部検出手段が検出した内部温度と前記外部温度との温度差ΔTを取得し、前記取得した温度差ΔTと、前記算出した限界温度差ΔTlmとに基づいて、前記フィルタの交換時期を示す第1の時間を計算する計算ステップと、
前記計算ステップの後、以前に取得した温度差ΔTを用いて前記所定期間ごとの温度差の時間変化率を求め、時間変化率が、所定の閾値を超えたかどうかを確認し、時間変化率が所定の閾値を超えていない場合には前記第1の時間を出力し、時間変化率が所定の閾値を超えている場合には、前記所定の閾値を超えている時間変化率と、最後に取得した温度差ΔTと、最後に算出した限界温度差ΔTlmとに基づいて、前記フィルタの交換時期を示す第2の時間を計算して出力する再計算ステップと、
前記再計算ステップにて出力された第1の時間もしくは第2の時間をフィルタの交換時期として通知する通知ステップと、を含む、フィルタの交換時期予測方法。 - 請求項8に記載のフィルタの交換時期予測方法において、
前記通知ステップでは、前記再計算ステップにて時間変化率が所定の閾値を超えていると確認された場合には前記フィルタの交換時期が前記第1の時間から前記第2の時間に変更となった旨を通知する、フィルタの交換時期予測方法。
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