WO2016098729A1 - Light source device, projector, and method for controlling light source device - Google Patents
Light source device, projector, and method for controlling light source device Download PDFInfo
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- WO2016098729A1 WO2016098729A1 PCT/JP2015/084942 JP2015084942W WO2016098729A1 WO 2016098729 A1 WO2016098729 A1 WO 2016098729A1 JP 2015084942 W JP2015084942 W JP 2015084942W WO 2016098729 A1 WO2016098729 A1 WO 2016098729A1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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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
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- the present invention relates to a light source device, and more particularly, to a light source device including a plurality of light sources having different colors of emitted light.
- the present invention also relates to a projector including such a light source device and a method for controlling the light source device.
- the projector has a function of displaying a desired image by projecting light emitted from the light source onto a distant screen by a projection optical system.
- a projection optical system For a projection optical system, the observer recognizes that the illuminance of the video image displayed on the screen has changed. Therefore, in a light source device used for a projector, control is normally performed to keep the light quantity emitted from the light source constant.
- the illuminance decreases when the same amount of current is supplied. Therefore, for example, in order to detect the amount of light, a part of the optical path is divided to extract a part of the light, and feedback control is performed to adjust the amount of current to the light source so that the extracted amount of light indicates a predetermined amount of light. Is called.
- Patent Document 1 discloses a light source control device including a plurality of light sources composed of R, G, and B color laser elements and detection means for detecting a light output value for each color.
- the light source control device includes control means for performing control so that the light output values of the plurality of light sources are always constant based on the detection result of the detection means. As described above, when the deterioration of the light source progresses, it is necessary to increase the amount of current supplied to the light source in order to emit the target amount of light, and the control unit performs such control.
- a solid state light source such as a laser element has a property that a physical property value changes when a current exceeding a predetermined current amount is supplied.
- this value is defined as a rated current value.
- the supply current to the solid state light source element increases when the above control is performed, and eventually reaches the rated current value. Even when a current amount corresponding to the rated current value is supplied to the solid-state light source element, the target light amount may not be realized.
- the light output of each light source It is configured to automatically switch from the control for making the value itself constant to the control for making the relative value of the light output of each light source constant. With such control, even when the light source deteriorates and a constant illuminance cannot be maintained, the relative intensities of R, G, and B can be kept constant, and the change in chromaticity can be suppressed. Has been.
- an object of the present invention is to realize a light source device capable of keeping illuminance and chromaticity constant within a predetermined period. It is another object of the present invention to provide a method for controlling such a light source device and a projector including such a light source device.
- a light source device is: A plurality of light sources having different colors of emitted light, and A light detection unit that individually detects the amount of light emitted from the plurality of light sources; A controller that controls the amount of light emitted from the plurality of light sources by adjusting the current supplied to the plurality of light sources; The controller is Each value of the target light amount and the first threshold current is stored for each of the plurality of light sources, The detected light amount detected by the light detection unit and the target light amount are compared for each color, and the current supplied to each of the plurality of light sources is adjusted so that the detected light amount matches the target light amount Control
- the second control for reducing the value of the target light amount after the end of the first control. It is characterized by performing.
- the control unit stores a value related to the target light amount for each color. While the first control is being executed, the current supply amount to each light source is adjusted so that the light amount detected by the light detection unit matches the target light amount.
- the amount of current to be supplied to the light source increases so that the detected light amount matches the target light amount.
- information on a predetermined threshold value (first threshold current) is stored for each color in the control unit with respect to the current amount. Then, if the amount of current supplied to the light source exceeds the first threshold current during the first control, the control unit, after the first control is finished, Control to reduce the value of the amount of light. That is, after this, the value of the target light amount of each light source changes.
- the illuminance is kept constant during this period. That is, assuming that this light source device is used as a projection light source for a movie theater, the illuminance does not decrease during the screening by performing only the first control during the single screening period.
- the first threshold current for example, control is performed to reduce the target light amount after the screening ends, so the next screening period In, the first control is executed again under a target light amount lower than that during the previous screening. That is, the illuminance decreases when compared between different screening periods, but the illuminance does not decrease within one screening period, so the observer will not recognize that the illuminance has decreased during the screening. .
- control is performed to reduce the target light amount value of each of the plurality of light sources as well as the light source.
- the amount of current supplied to each light source is reduced, so the color before and after the target light amount is reduced. Can hold the degree. That is, the chromaticity of the projected image does not change within different projection periods.
- the control unit when the current supplied to at least one light source during the first control exceeds the first threshold current, the control unit preferably performs the second control immediately after the end of the first control.
- the present invention is not limited to this aspect. That is, even when the current supplied to at least one light source during the first control exceeds the first threshold current, the control unit performs the first control with the same target light quantity for the subsequent two or more times. You may perform 2nd control after performing. That is, the present invention performs the first control performed by the control unit immediately after the current supplied to at least one light source during the first control exceeds the first threshold current, or after 2-3 times, for example.
- the right control includes the case where the first control is executed with the same target light amount value, and then the control unit executes the first control under the target light amount that is reduced by executing the second control.
- the value of the first threshold current is set to a value lower than the rated current described above. More specifically, the first threshold current corresponds to a rated current in each of the plurality of light sources or a maximum current that can be supplied to each of the plurality of light sources within a range that does not affect physical characteristics. The value can be lower than the two threshold current.
- each light source can emit a target amount of light, and the illuminance and chromaticity can be maintained at desired values.
- the controller is configured to repeat a cycle of stopping the first control over a second period a plurality of times after performing the first control over a first period,
- the first threshold current is the amount of current supplied to the light source within the first period. It may be set so as not to exceed the two threshold currents.
- the amount of current supplied to the light source can be reliably set to be equal to or less than the second threshold current within each first period.
- the first period as the screening period
- the illuminance and chromaticity can be reliably kept constant during the screening of each movie.
- the second period can be an interval period between the screening of one movie and the screening of another movie.
- the control unit is configured so that a current supplied to the light source immediately after the start of the first control after the value of the target light amount is decreased by the second control is equal to or less than the first threshold current. It is also possible to set a reduction range of the value of the target light amount in the second control.
- the amount of current supplied to each light source is lower than the first threshold current. Therefore, it can suppress that the electric current amount supplied with respect to each light source reaches a 2nd threshold current within the period when this 1st control is performed.
- the projector according to the present invention is It includes a light source device having any one of the above features and an optical system that projects light emitted from the light source device.
- the present invention is a method for controlling a light source device including a plurality of light sources having different colors of emitted light, Each value of the target light amount and the first threshold current is stored for each of the plurality of light sources, The amount of light emitted from the plurality of light sources is detected separately, and the detected amount of light detected and the target amount of light are compared for each color so that the detected amount of light matches the target amount of light.
- a first control for adjusting the current supplied to each of the plurality of light sources During the execution of the first control, when the current supplied to at least one of the light sources exceeds the first threshold current, a second control for reducing the value of the target light amount after the end of the first control; It is characterized by including.
- the light source device of the present invention it is possible to keep the illuminance and chromaticity constant during a period in which the amount of light emitted from the light source is controlled to coincide with a predetermined target amount of light. For this reason, when such a light source device is used as a light source device for projection, the occurrence of a situation in which chromaticity or illuminance decreases during image projection is suppressed.
- FIG. 1 is a block diagram schematically showing a configuration of a projector including the light source device of the present embodiment.
- a projector 10 shown in FIG. 1 includes a light source device 1 and an optical system 2 that projects light emitted from the light source device.
- FIG. 1 also shows a screen 3 on which an image from the projector 10 is projected.
- the light source device 1 includes a light source unit 11, a light detection unit 12, and a control unit 13.
- the light source unit 11 includes a light source 11R that emits red light, a light source 11G that emits green light, and a light source 11B that emits blue light.
- Each light source (11R, 11G, 11B) includes a solid light source element such as an LED element or a laser diode element.
- the light source part 11 is comprised with the light source which emits the light of 3 colors, it is not limited to 3 about the number of colors.
- Each light source may be configured to include a known wavelength conversion element in addition to the solid light source element.
- the light source 11G includes a laser diode element that emits infrared light and a wavelength conversion element such as PPLN (Periodically Poled Lithium Niobat) that converts the wavelength of the infrared light to 1 ⁇ 2. You may be comprised by.
- PPLN Periodically Poled Lithium Niobat
- the light source unit 11 is driven and controlled by the control unit 13. More specifically, the light source unit 11 includes a power source for driving each light source, and the control unit 13 separately controls the amount of current supplied from the power source to each light source (11R, 11G, 11B). It is a configuration that can.
- the light detection unit 12 is configured to be able to detect the amount of light emitted from each light source (11R, 11G, 11B). More specifically, the light detection unit 12 detects a part of the light emitted from the light source 11R, a light detection unit 12R that detects a part of the light emitted from the light source 11G, and a light source 11B.
- the light detection part 12B which detects a part of light inject
- a partially reflecting mirror 14R is installed on the optical path of the light emitted from the light source 11R toward the optical system 2, and the light reflected through the mirror 14R is directed toward the light detection unit 12R.
- a partially reflecting mirror 14G is installed on the optical path of the light emitted from the light source 11G toward the optical system 2, and the light reflected through the mirror 14G travels toward the light detection unit 12G.
- a partially reflecting mirror 14B is installed on the optical path of the light emitted from the light source 11B toward the optical system 2, and the light reflected through the mirror 14B travels toward the light detection unit 12B.
- the light detection unit 12 detects the amount of light emitted from each light source (11R, 11G, 11B) separately, it gives the control unit 13 information on the detected light amount.
- the control unit 13 stores a target light amount value and a predetermined threshold current (corresponding to “first threshold current”) for each of the light sources (11R, 11G, and 11B).
- control contents performed by the control unit 13 will be described with reference to the flowchart shown in FIG.
- control by the control unit 13 is started.
- the control unit 13 first determines whether or not it is necessary to change the value of the target light amount (step S1).
- step S1 the case where there is no need to change the value of the target light amount (No in step S1) will be described first.
- step S1 the case where the target light amount value needs to be changed will be described after the step of changing the target light amount value.
- the control unit 13 reads the value of the target light amount stored for each color (step S2A). And the control part 13 acquires the value of the detected light quantity for every color from the light detection part 12 (12R, 12G, 12B) (step S3). And the control part 13 compares the value of the target light quantity read by step S2 with the value of the detected light quantity acquired by step S3 for every color (step S4).
- control part 13 adjusts the electric current amount supplied with respect to the light source (11R, 11G, 11B) for every color so that the value of detected light quantity may correspond with the value of target light quantity (step S5). That is, the control unit 13 compares the detected light amount value with the target light amount value for each color, and if they match (Yes in step S4), does not change the amount of current supplied to the light source corresponding to the color. On the other hand, the control unit 13 compares the value of the detected light amount and the value of the target light amount for each color, and if they do not match (No in step S4), changes the amount of current supplied to the light source corresponding to the color.
- control unit 13 performs control to reduce the amount of current supplied to the target light source, and the detected light quantity shows a value lower than the target light quantity. If so, the control unit 13 performs control to increase the amount of current supplied to the target light source.
- Control unit 13 acquires the amount of current supplied to each light source (11R, 11G, 11B) separately (step S6). Then, the control unit 13 reads the value of the first threshold current amount stored for each color, and compares the magnitude relationship with the amount of current supplied to each light source acquired for each color in step S6 (step S7). ).
- step S7 when the amount of current supplied to each light source is equal to or less than the corresponding first threshold current (Yes in step S7), the control unit 13 repeatedly executes each step of steps S3-S7. On the other hand, when the supply current amount to the light source exceeds the corresponding first threshold current in at least one or more colors (No in step S7), the control unit 13 determines the next control period for the light source of the color. In step S8, the fact that the target light amount value is to be decreased is stored (step S8), and steps S3-S7 are repeated.
- the values of the first threshold current set in the light source 11R, the light source 11G, and the light source 11B are RI1, GI1, and BI1, respectively.
- the target light amount values set in the light source 11R, the light source 11G, and the light source 11B in the certain control period T1 are RL1, GL1, and BL1, respectively.
- the current amount Ib supplied to the light source 11B exceeds the first threshold current BI1 set for the light source 11B at a predetermined time point in the control period T1. Further, it is assumed that the current amounts of the other light sources do not exceed the corresponding first threshold current value.
- the current amount Ir supplied to the light source 11R does not exceed the first threshold current RI1 set for the light source 11R, and the current amount Ig supplied to the light source 11G is equal to the light source 11G.
- the first threshold current GI1 that has been set to is not exceeded.
- step S8 the control unit 13 stores that the target light amount is reduced in the next control period (for convenience, “T2”). In this step S8, it is only stored that the target light amount is decreased in the next control period T2, and the target light amounts of the light sources 11R, 11G, and 11B are still RL1, It remains GL1 and BL1.
- the control unit 13 When the control period T1 ends and the control of the light source device 1 is started again, that is, when the control period T2 is started, the control unit 13 firstly sets the target light amount of each light source (11R, 11G, 11B). It is determined whether or not it is necessary to change the value of (step S1). Here, since it is necessary to decrease the value of the target light amount (Yes in step S1), the control unit 13 decreases the value of the target light amount currently set for each light source (11R, 11G, 11B). Control is performed (step S2B).
- step S2B of the control period T2 the control unit 13 performs control to reduce the value of the target light amount for all the light sources (11R, 11G, 11B).
- the values of the target light amounts of the newly set light sources 11R, 11G, and 11B are RL2, GL2, and BL2, respectively.
- control unit 13 executes steps S3 to S8.
- control unit 13 When the control unit 13 performs such control, the control unit 13 holds the light amount emitted from each light source (11R, 11G, 11B) at a predetermined light amount within a predetermined period.
- the control unit 13 holds the light amount emitted from each light source (11R, 11G, 11B) at a predetermined light amount within a predetermined period. The fact that the illuminance and chromaticity can be maintained within the controlled period (within the control period) will be described with reference to the graph of FIG.
- FIG. 3 is a graph schematically showing temporal changes in the amount of current supplied to each light source (11R, 11G, 11B) and the amount of light emitted from each light source within each control period.
- the supply current amount Ib of only the blue light source 11B exceeds the first threshold current BI1
- the supply current amount of the other light sources exceeds the first threshold current. Shall not. For example, this corresponds to a case where the blue light source 11B is more deteriorated than the other light sources (11R, 11G).
- control periods T0, T1, T2, and T3 are illustrated. That is, in FIG. 3, the supply current amount Ib does not exceed the first threshold current BI1 for the blue light source 11B in the control period T0, and the supply current amount Ib exceeds the first threshold current BI1 for the first time in the control period T1. It is shown.
- the amount of current Ib supplied to the light source 11B increases with time. This corresponds to the case where the deterioration of the light source 11B is progressing compared to the light sources 11R and 11G. That is, if the light source (11R, 11G, 11B) deteriorates, the light emission amount under the same supply current amount decreases, so the supply current amount is increased to achieve the target light amount (RL1, GL1, BL1). Must. Since the deterioration of the element proceeds with the passage of time, the supply current amount in the light source 11B also increases with the passage of time. Note that, with respect to the light sources 11R and 11G, since the element hardly deteriorates, the amount of current supplied to each light source (Ir, Ig) is almost constant.
- one control period can be, for example, from when the power source is turned on to the light source device 1 until when the power source is released.
- one control period can be set as one movie screening period. In the latter case, for example, in a movie theater, a movie M0 is shown during the control period T0, and another movie M1 is shown during the next control period T1 after a predetermined interval. Can do.
- the supply current amount Ib to the light source 11B exceeds the first threshold current BI1 within the control period T1. For this reason, in the next control period T2, the target light amounts of all the light sources 11R, 11G, and 11B are decreased from RL1, GL1, and BL1 in the control period T1, respectively, and are set to RL2, GL2, and BL2. .
- FIG. 3 shows that the amount of emitted light and the amount of supplied current in the control period T2 are lower than those in the control period T1, respectively.
- the amount of supplied current and the amount of emitted light are lower in the control period T2 than in the control period T1.
- the current amount Ib supplied to the light source 11B is lower than the first threshold current BI1 within the control period T2. That is, in this case, in the next control period T3, the target light amount of each light source (11R, 11G, 11B) is set to the same value as in the control period T2.
- the current amount Ib supplied to the light source 11B again exceeds the first threshold current BI1 in the control period T3. For this reason, after the end of the control period T3, the target light amount of (11R, 11G, 11B) of each light source is set to a value decreased from the control period T3.
- the rate of increase in the amount of current supplied to the light source is faster than other light sources.
- the target light amount is reduced in the subsequent control period.
- the supply current amount at this time also decreases.
- the amount of current Ib supplied to the light source 11B can be prevented from reaching the second threshold current BI2.
- the amount of supplied current does not reach the second threshold current.
- the target light amount value is kept constant within each control period (T0, T1, T2, T3). Therefore, more specifically, while the control is being performed by the control unit 13, the control unit 13 controls the light amount emitted from each light source (11R, 11G, 11B) to be held at a predetermined light amount. Within the period, the amount of light emitted from each light source is kept constant. Therefore, the illuminance and chromaticity do not change within each control period.
- the light source device 1 when the supply current amount exceeds the first threshold current for a certain light source (here, the light source 11 ⁇ / b> B) within a certain control period (here, the period T ⁇ b> 1), only this light source is used in the later control period.
- the target light amount is reduced for other light sources. This means that, when changing the target light amount, the ratio of the light emission amount from each light source can be kept constant or substantially constant. That is, chromaticity can be maintained over a control period (here, control periods T1 and T2) before and after the target light amount is changed.
- the amount of emitted light is different between the control period T1 and the control period T2, and thus when used as the projector 10, the illuminance of the image projected on the screen 3 is different.
- the illuminance of the image does not change during the movie screening. The observer does not recognize that the illuminance has decreased during the screening.
- the information regarding the first threshold current may be stored in advance by the control unit 13.
- the value of each first threshold current depends on the rising speed of the supply current amount when each light source (11R, 11G, 11B) deteriorates and the length of the assumed control period (T1, T2, etc.). Can be set in advance.
- each control period corresponds to one movie showing time as described above.
- the movie show time is generally configured within an approximate range (for example, 1.5 hours to 4 hours).
- the amount of current supplied to the light source is the value of the first threshold current
- the amount of current supplied to the light source falls below the second threshold current. It is preferable to set the value of the first threshold current.
- the current supplied to the light source immediately after the control is started under the reduced target light amount is equal to or less than the first threshold current. It is preferable to set so as to be. This is because the amount of current supplied to the deteriorated light source can be reduced to a range that does not approach the second threshold current by using a new target light amount.
- the projector 10 includes a spatial modulation element 21 (21R, 21G, 21B) that converts light emitted from each light source (11R, 11G, 11B) into an optical image, and a light image emitted from each spatial modulation element 21.
- a color synthesizing optical system 22 for synthesizing and a projection optical system 23 for enlarging and projecting the light image emitted from the color synthesizing optical system 22 onto the screen 3 are configured.
- the spatial modulation element 21 is composed of, for example, a digital micromirror device or a liquid crystal display device
- the color composition optical system 22 is composed of a color composition prism such as a dichroic prism
- the projection optical system 23 is composed of, for example, a projection lens.
- the light source device 1 includes the dichroic mirrors 15R and 15G and the partial reflection mirror 14B, so that a part of the light emitted from each light source (11R, 11G, and 11B) is superimposed. It does not matter even if it proceeds to the light detection unit 12. Even in this case, the light detection units 12R, 12G, and 12B can detect the amounts of light corresponding to the amounts of light emitted from the light sources 11R, 11G, and 11B, respectively.
- the control content which the light source device 1 which concerns on this invention performs is not restricted to this aspect.
- the amount of current supplied to the light source 11B in the control period T1 exceeds the first threshold current BI1, but not the control period T2 immediately after, but the next control period T3 or more.
- the target light amount may be decreased for the first time within the control period after several times.
- Light source device 2 Optical system 3: Screen 10: Projector 11: Light source unit 11R, 11G, 11B: Light source 12: Light detection unit 12R, 12G, 12B: Light detection unit 13: Control unit 14R, 14G, 14B: One Partial reflection mirror 15R, 15G: Dichroic mirror 16R, 16G, 16B: Filter 21: Spatial modulation element 21R, 21G, 21B: Spatial modulation element 22: Color synthesizing optical system 23: Projection optical system
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Abstract
Provided is a light source device capable of maintaining brightness and chromaticity at fixed levels during a predetermined time period. The light source device is provided with a plurality of light sources having mutually different colors of light to be emitted, a light-detecting unit for individually detecting the amount of light emitted from the plurality of light sources, and a control unit for controlling the amount of light emitted from the plurality of light sources by adjusting the electric current supplied to the plurality of light sources. The control unit carries out: a first control in which the values of a target amount of light and a first threshold electric current are stored for each of the plurality of light sources, the detected amount of light detected by the light-detecting unit and the target amount of light are compared for each color, and the electric current supplied to each of the plurality of light sources is adjusted so that the detected amount of light matches the target amount of light; and a second control in which the value of the target amount of light after the completion of the first control is reduced when the electric current supplied to at least one of the light sources exceeds the first threshold electric current during the first control.
Description
本発明は光源装置に関し、特に発せられる光の色が相互に異なる複数の光源を備えた光源装置に関する。また、本発明はこのような光源装置を含むプロジェクタ並びに光源装置の制御方法に関する。
The present invention relates to a light source device, and more particularly, to a light source device including a plurality of light sources having different colors of emitted light. The present invention also relates to a projector including such a light source device and a method for controlling the light source device.
映画やホームシアター用等に利用される投射型プロジェクタの光源として、従来のランプに代わって、LEDやレーザ素子(LD)といった固体光源を用いた装置の開発が進められている。
Development of devices using solid-state light sources such as LEDs and laser elements (LDs) instead of conventional lamps as a light source for projection projectors used for movies, home theaters, and the like is underway.
プロジェクタは、光源から射出された光を投射光学系によって遠方のスクリーンに投射することで、所望の映像を表示する機能を有する。ここで、光源から射出される光量が変化すると、観察者はスクリーンに映る映像の照度が変化したことを認識してしまう。よって、プロジェクタに利用される光源装置においては、光源から射出される光量を一定に保つ制御が通常行われる。
The projector has a function of displaying a desired image by projecting light emitted from the light source onto a distant screen by a projection optical system. Here, when the amount of light emitted from the light source changes, the observer recognizes that the illuminance of the video image displayed on the screen has changed. Therefore, in a light source device used for a projector, control is normally performed to keep the light quantity emitted from the light source constant.
光源は経時的に劣化していくため、同じ電流量を供給していると照度が低下してしまう。そこで、例えば光量を検知するために光路の一部を分割して光の一部を取り出し、この取り出された光量が所定の光量を示すように、光源への電流量を調整するフィードバック制御が行われる。
Since the light source deteriorates with time, the illuminance decreases when the same amount of current is supplied. Therefore, for example, in order to detect the amount of light, a part of the optical path is divided to extract a part of the light, and feedback control is performed to adjust the amount of current to the light source so that the extracted amount of light indicates a predetermined amount of light. Is called.
ここで、従来のように光源としてランプを用いる場合には、光源からの射出光は白色光であるため、光源からの射出光量が低下したとしても単に照度が低下するだけであり、色バランスは依然として保持される。しかし、光源として固体光源を用いる場合には、色毎に異なる光源を準備する必要があり、また各光源が異なる組成や原理に基づいて発光する現象を利用しているため、色毎に劣化の程度が異なる。このため、色毎に上記フィードバック制御を行って、照度のみならず色度(色バランス)も保持させる必要がある。このような技術としては、例えば下記特許文献1に記載のものが知られている。
Here, when a lamp is used as a light source as in the prior art, since the light emitted from the light source is white light, even if the amount of light emitted from the light source is reduced, the illuminance is simply reduced, and the color balance is Still retained. However, when using a solid-state light source as a light source, it is necessary to prepare a different light source for each color, and each light source uses a phenomenon that emits light based on a different composition and principle, so that deterioration occurs for each color. The degree is different. For this reason, it is necessary to maintain the chromaticity (color balance) as well as the illuminance by performing the feedback control for each color. As such a technique, for example, one described in Patent Document 1 below is known.
特許文献1には、R,G,B3色のレーザ素子で構成された複数の光源と、色毎に光出力値を検出する検出手段とを備えた光源制御装置が開示されている。この光源制御装置は、検出手段の検出結果に基づいて、前記複数の光源のそれぞれの光出力値が常に一定になるように制御を行う制御手段を備えている。上述したように、光源の劣化が進むと、目標光量の光を射出させるために光源に供給する電流量を上昇させる必要があり、制御手段はかかる制御を行っている。
Patent Document 1 discloses a light source control device including a plurality of light sources composed of R, G, and B color laser elements and detection means for detecting a light output value for each color. The light source control device includes control means for performing control so that the light output values of the plurality of light sources are always constant based on the detection result of the detection means. As described above, when the deterioration of the light source progresses, it is necessary to increase the amount of current supplied to the light source in order to emit the target amount of light, and the control unit performs such control.
ところで、レーザ素子等の固体光源には、所定の電流量以上の電流が供給されると物性値が変化してしまう性質を有しており、例えばこの値は定格電流値として規定されている。固体光源素子の劣化が進行すると、上記のような制御を行っていると固体光源素子への供給電流が上昇して、やがて定格電流値に達する。そして、固体光源素子に対してこの定格電流値に相当する電流量を供給しても、目標とする光量が実現できなくなる場合がある。このような状態が招来するのを回避すべく、特許文献1の装置では、あらかじめ設定された許容最大値を超えて電流が供給されるおそれのある光源があった場合に、各光源の光出力値そのものを一定にする制御から、各光源の光出力の相対的な値を一定にする制御へと自動的に切り換えるよう構成されている。このような制御により、光源が劣化して一定の照度が保てなくなった場合でも、R,G,Bの相対的な強度を一定に保つことができ、色度の変化を抑えることができるとされている。
By the way, a solid state light source such as a laser element has a property that a physical property value changes when a current exceeding a predetermined current amount is supplied. For example, this value is defined as a rated current value. When the deterioration of the solid state light source element proceeds, the supply current to the solid state light source element increases when the above control is performed, and eventually reaches the rated current value. Even when a current amount corresponding to the rated current value is supplied to the solid-state light source element, the target light amount may not be realized. In order to avoid the occurrence of such a state, in the apparatus of Patent Document 1, when there is a light source that is likely to be supplied with a current exceeding a preset allowable maximum value, the light output of each light source It is configured to automatically switch from the control for making the value itself constant to the control for making the relative value of the light output of each light source constant. With such control, even when the light source deteriorates and a constant illuminance cannot be maintained, the relative intensities of R, G, and B can be kept constant, and the change in chromaticity can be suppressed. Has been.
しかしながら、特許文献1に記載の装置のように、各光源の光出力の相対値を一定に保つ制御を行った場合、色度の変化は抑制されたとしても各光源の光出力自体は一定に保たれない結果、装置の駆動中に照度が変化してしまう。このことは、例えばかかる光源装置を映像の投射機(プロジェクタ)用の光源として利用した場合に、映像の投射中に照度が低下してしまうことを意味しており、特に映画のような長期間の映像を投射する用途に利用される際には、投射映像の最初と最後で照度が異なってしまうことを意味する。
However, when control is performed to keep the relative value of the light output of each light source constant as in the device described in Patent Document 1, the light output itself of each light source is kept constant even if the change in chromaticity is suppressed. As a result, the illuminance changes while the device is being driven. This means that, for example, when such a light source device is used as a light source for a video projector (projector), the illuminance decreases during the projection of the video. This means that the illuminance differs between the beginning and end of the projected image.
本発明は、上記の課題に鑑み、所定の期間内においては照度と色度を一定に保つことのできる光源装置を実現することを目的とする。また、本発明は、このような光源装置の制御方法、並びにかかる光源装置を備えたプロジェクタを提供することを目的とする。
In view of the above problems, an object of the present invention is to realize a light source device capable of keeping illuminance and chromaticity constant within a predetermined period. It is another object of the present invention to provide a method for controlling such a light source device and a projector including such a light source device.
上記の課題を解決すべく、本発明に係る光源装置は、
発せられる光の色が相互に異なる複数の光源と、
前記複数の光源から発せられた光の光量を各別に検出する光検出部と、
前記複数の光源に供給される電流を調整することで前記複数の光源から発せられる光の光量を制御する制御部とを備え、
前記制御部は、
前記複数の光源のそれぞれに関して目標光量及び第一閾値電流の各値を記憶しており、
前記光検出部で検出された検出光量と前記目標光量とを色毎に比較して、前記検出光量が前記目標光量に一致するように前記複数の光源それぞれに供給される電流を調整する第一制御を行い、
前記第一制御の実行中、少なくとも一つの前記光源に供給される電流が前記第一閾値電流を超えた場合には、当該第一制御の終了後に前記目標光量の値を低下させる第二制御を行うことを特徴とする。 In order to solve the above problems, a light source device according to the present invention is:
A plurality of light sources having different colors of emitted light, and
A light detection unit that individually detects the amount of light emitted from the plurality of light sources;
A controller that controls the amount of light emitted from the plurality of light sources by adjusting the current supplied to the plurality of light sources;
The controller is
Each value of the target light amount and the first threshold current is stored for each of the plurality of light sources,
The detected light amount detected by the light detection unit and the target light amount are compared for each color, and the current supplied to each of the plurality of light sources is adjusted so that the detected light amount matches the target light amount Control
During the execution of the first control, when the current supplied to at least one of the light sources exceeds the first threshold current, the second control for reducing the value of the target light amount after the end of the first control. It is characterized by performing.
発せられる光の色が相互に異なる複数の光源と、
前記複数の光源から発せられた光の光量を各別に検出する光検出部と、
前記複数の光源に供給される電流を調整することで前記複数の光源から発せられる光の光量を制御する制御部とを備え、
前記制御部は、
前記複数の光源のそれぞれに関して目標光量及び第一閾値電流の各値を記憶しており、
前記光検出部で検出された検出光量と前記目標光量とを色毎に比較して、前記検出光量が前記目標光量に一致するように前記複数の光源それぞれに供給される電流を調整する第一制御を行い、
前記第一制御の実行中、少なくとも一つの前記光源に供給される電流が前記第一閾値電流を超えた場合には、当該第一制御の終了後に前記目標光量の値を低下させる第二制御を行うことを特徴とする。 In order to solve the above problems, a light source device according to the present invention is:
A plurality of light sources having different colors of emitted light, and
A light detection unit that individually detects the amount of light emitted from the plurality of light sources;
A controller that controls the amount of light emitted from the plurality of light sources by adjusting the current supplied to the plurality of light sources;
The controller is
Each value of the target light amount and the first threshold current is stored for each of the plurality of light sources,
The detected light amount detected by the light detection unit and the target light amount are compared for each color, and the current supplied to each of the plurality of light sources is adjusted so that the detected light amount matches the target light amount Control
During the execution of the first control, when the current supplied to at least one of the light sources exceeds the first threshold current, the second control for reducing the value of the target light amount after the end of the first control. It is characterized by performing.
制御部では、色毎に目標光量に関する値が記憶されている。そして、第一制御が実行されている間においては、光検出部で検出された光量がこの目標光量に一致するように、各光源への電流供給量が調整される。
The control unit stores a value related to the target light amount for each color. While the first control is being executed, the current supply amount to each light source is adjusted so that the light amount detected by the light detection unit matches the target light amount.
ここで、上述したように、光源の劣化が進むと、検出光量を目標光量に一致させるべく当該光源に供給すべき電流量は上昇する。本発明に係る光源装置は、制御部においてこの電流量に関して、色ごとに所定の閾値(第一閾値電流)に関する情報が記憶されている。そして、第一制御を行っている間に、光源に対して供給される電流量がこの第一閾値電流を超えると、当該第一制御が終了した後に、制御部は、複数の光源それぞれの目標光量の値を低下させる制御を行う。つまり、この後においては、各光源の目標光量の値が変化する。
Here, as described above, as the deterioration of the light source proceeds, the amount of current to be supplied to the light source increases so that the detected light amount matches the target light amount. In the light source device according to the present invention, information on a predetermined threshold value (first threshold current) is stored for each color in the control unit with respect to the current amount. Then, if the amount of current supplied to the light source exceeds the first threshold current during the first control, the control unit, after the first control is finished, Control to reduce the value of the amount of light. That is, after this, the value of the target light amount of each light source changes.
かかる構成とした場合、第一制御の実行中においては目標光量が変化しないため、この期間は照度が一定に保たれる。つまり、この光源装置を映画館の投射用光源として利用することを想定すると、一回の上映期間中は第一制御のみを実行することで、上映中に照度が低下するということはない。そして、当該上映中に、仮にいずれかの色の光源への供給電流量が第一閾値電流を超えていると、例えばこの上映終了後に目標光量を低下する制御が行われるため、次の上映期間においては、前回の上映中よりは低い目標光量の下で再び第一制御が実行される。すなわち、別々の上映期間の間で比較すれば照度は低下するものの、一の上映期間内において照度が低下することはないため、観察者が上映中に照度が低下したことを認識することはない。
In such a configuration, since the target light amount does not change during the execution of the first control, the illuminance is kept constant during this period. That is, assuming that this light source device is used as a projection light source for a movie theater, the illuminance does not decrease during the screening by performing only the first control during the single screening period. During the screening, if the amount of current supplied to the light source of any color exceeds the first threshold current, for example, control is performed to reduce the target light amount after the screening ends, so the next screening period In, the first control is executed again under a target light amount lower than that during the previous screening. That is, the illuminance decreases when compared between different screening periods, but the illuminance does not decrease within one screening period, so the observer will not recognize that the illuminance has decreased during the screening. .
また、少なくとも一の光源に供給される電流が第一閾値電流を超えると、当該光源のみならず、複数の光源それぞれの目標光量の値を低下させる制御が行われる。つまり、特定の色の光を発する光源に供給される電流量のみを低下させるのではなく、各光源に供給される電流量が低下されるため、目標光量の値を低下させる前と後で色度を保持することができる。つまり、異なる投射期間内において投射される映像の色度が変化するということもない。
Further, when the current supplied to at least one light source exceeds the first threshold current, control is performed to reduce the target light amount value of each of the plurality of light sources as well as the light source. In other words, instead of reducing only the amount of current supplied to the light source that emits light of a specific color, the amount of current supplied to each light source is reduced, so the color before and after the target light amount is reduced. Can hold the degree. That is, the chromaticity of the projected image does not change within different projection periods.
なお、上記構成において、第一制御中に少なくとも一つの光源に供給される電流が第一閾値電流を超えた場合、制御部は当該第一制御の終了直後に第二制御を行うことが好ましいが、本発明はこの態様には限られない。すなわち、第一制御中に少なくとも一つの光源に供給される電流が第一閾値電流を超えた場合であっても、制御部はその後の2回又は複数回については同一の目標光量で第一制御を実行した後に、第二制御を行っても構わない。すなわち、本発明は、第一制御中に少なくとも一つの光源に供給される電流が第一閾値電流を超えた場合において、その直後に制御部が行う第一制御、又は例えば2-3回後に行う第一制御については同じ目標光量の値でもって実行し、その後、第二制御が実行されることで低下した目標光量の下で制御部が第一制御を実行する場合も権利範囲に含む。
In the above configuration, when the current supplied to at least one light source during the first control exceeds the first threshold current, the control unit preferably performs the second control immediately after the end of the first control. The present invention is not limited to this aspect. That is, even when the current supplied to at least one light source during the first control exceeds the first threshold current, the control unit performs the first control with the same target light quantity for the subsequent two or more times. You may perform 2nd control after performing. That is, the present invention performs the first control performed by the control unit immediately after the current supplied to at least one light source during the first control exceeds the first threshold current, or after 2-3 times, for example. The right control includes the case where the first control is executed with the same target light amount value, and then the control unit executes the first control under the target light amount that is reduced by executing the second control.
ここで、第一閾値電流の値は、上述した定格電流よりは低い値に設定される。より詳細には、前記第一閾値電流は、前記複数の光源のそれぞれにおける定格電流又は物理的特性に影響を与えない範囲内で前記複数の光源のそれぞれに供給可能な最大電流、に対応する第二閾値電流よりも低い値とすることができる。
Here, the value of the first threshold current is set to a value lower than the rated current described above. More specifically, the first threshold current corresponds to a rated current in each of the plurality of light sources or a maximum current that can be supplied to each of the plurality of light sources within a range that does not affect physical characteristics. The value can be lower than the two threshold current.
このように第一閾値電流の値が設定されることで、第一制御を実行している期間内においては、目標光量を出力するために光源に対して供給される電流量を上昇する制御を行っても、素子特性に影響を及ぼすような許容最大電流値(第二閾値電流)を超えないように調整できる。よって、第一制御が行われる期間内においては、各光源がそれぞれ目標光量の光を射出させることが可能となり、照度及び色度を所望の値に保持できる。
By setting the value of the first threshold current in this way, control is performed to increase the amount of current supplied to the light source in order to output the target light amount during the period in which the first control is being executed. Even if it is performed, it can be adjusted so as not to exceed the allowable maximum current value (second threshold current) that affects the element characteristics. Therefore, during the period in which the first control is performed, each light source can emit a target amount of light, and the illuminance and chromaticity can be maintained at desired values.
また、前記光源装置において、
前記制御部は、第一期間にわたって前記第一制御を行った後、第二期間にわたって前記第一制御を停止するというサイクルを複数回繰り返す構成であり、
前記第一閾値電流は、前記第一期間の開始時に前記光源に対して当該第一閾値電流が供給された場合に、当該第一期間内に前記光源に対して供給される電流量が前記第二閾値電流を超えないように設定されているものとしても構わない。 In the light source device,
The controller is configured to repeat a cycle of stopping the first control over a second period a plurality of times after performing the first control over a first period,
When the first threshold current is supplied to the light source at the start of the first period, the first threshold current is the amount of current supplied to the light source within the first period. It may be set so as not to exceed the two threshold currents.
前記制御部は、第一期間にわたって前記第一制御を行った後、第二期間にわたって前記第一制御を停止するというサイクルを複数回繰り返す構成であり、
前記第一閾値電流は、前記第一期間の開始時に前記光源に対して当該第一閾値電流が供給された場合に、当該第一期間内に前記光源に対して供給される電流量が前記第二閾値電流を超えないように設定されているものとしても構わない。 In the light source device,
The controller is configured to repeat a cycle of stopping the first control over a second period a plurality of times after performing the first control over a first period,
When the first threshold current is supplied to the light source at the start of the first period, the first threshold current is the amount of current supplied to the light source within the first period. It may be set so as not to exceed the two threshold currents.
上記構成によれば、各第一期間内において、光源に対して供給される電流量を確実に第二閾値電流以下に設定することができる。例えば、第一期間を上映期間とすることで、各映画の上映中においては、照度と色度を確実に一定に保つことが可能となる。なお、このとき、第二期間を、ある映画の上映と別の映画の上映の間のインターバル期間とすることができる。
According to the above configuration, the amount of current supplied to the light source can be reliably set to be equal to or less than the second threshold current within each first period. For example, by setting the first period as the screening period, the illuminance and chromaticity can be reliably kept constant during the screening of each movie. At this time, the second period can be an interval period between the screening of one movie and the screening of another movie.
また、前記光源装置において、
前記制御部は、前記第二制御によって前記目標光量の値を低下させた後の前記第一制御の開始直後における前記光源に供給される電流が前記第一閾値電流以下になるように、前記第二制御における前記目標光量の値の下げ幅を設定しているものとしても構わない。 In the light source device,
The control unit is configured so that a current supplied to the light source immediately after the start of the first control after the value of the target light amount is decreased by the second control is equal to or less than the first threshold current. It is also possible to set a reduction range of the value of the target light amount in the second control.
前記制御部は、前記第二制御によって前記目標光量の値を低下させた後の前記第一制御の開始直後における前記光源に供給される電流が前記第一閾値電流以下になるように、前記第二制御における前記目標光量の値の下げ幅を設定しているものとしても構わない。 In the light source device,
The control unit is configured so that a current supplied to the light source immediately after the start of the first control after the value of the target light amount is decreased by the second control is equal to or less than the first threshold current. It is also possible to set a reduction range of the value of the target light amount in the second control.
かかる構成とした場合、第二制御によって目標光量が低下された後の第一制御が開始した直後の状態では、各光源に対して供給される電流量は第一閾値電流を下回る。これにより、この第一制御が実行される期間内においては、各光源に対して供給される電流量が第二閾値電流に達することを抑制することができる。
In such a configuration, in the state immediately after the first control is started after the target light amount is reduced by the second control, the amount of current supplied to each light source is lower than the first threshold current. Thereby, it can suppress that the electric current amount supplied with respect to each light source reaches a 2nd threshold current within the period when this 1st control is performed.
また、本発明に係るプロジェクタは、
上記いずれかの特徴を有する光源装置と、前記光源装置から射出された光を投射する光学系とを含むことを特徴とする。 The projector according to the present invention is
It includes a light source device having any one of the above features and an optical system that projects light emitted from the light source device.
上記いずれかの特徴を有する光源装置と、前記光源装置から射出された光を投射する光学系とを含むことを特徴とする。 The projector according to the present invention is
It includes a light source device having any one of the above features and an optical system that projects light emitted from the light source device.
また、本発明は、発せられる光の色が相互に異なる複数の光源を含む光源装置の制御方法であって、
前記複数の光源のそれぞれに関して目標光量及び第一閾値電流の各値が記憶されており、
前記複数の光源から発せられた光の光量を各別に検出すると共に、当該検出された検出光量と前記目標光量とを色毎に比較して、前記検出光量が前記目標光量に一致するように前記複数の光源それぞれに供給する電流を調整する第一制御と、
前記第一制御の実行中、少なくとも一つの前記光源に供給される電流が前記第一閾値電流を超えた場合には、当該第一制御の終了後に前記目標光量の値を低下させる第二制御とを含むことを特徴とする。 Further, the present invention is a method for controlling a light source device including a plurality of light sources having different colors of emitted light,
Each value of the target light amount and the first threshold current is stored for each of the plurality of light sources,
The amount of light emitted from the plurality of light sources is detected separately, and the detected amount of light detected and the target amount of light are compared for each color so that the detected amount of light matches the target amount of light. A first control for adjusting the current supplied to each of the plurality of light sources;
During the execution of the first control, when the current supplied to at least one of the light sources exceeds the first threshold current, a second control for reducing the value of the target light amount after the end of the first control; It is characterized by including.
前記複数の光源のそれぞれに関して目標光量及び第一閾値電流の各値が記憶されており、
前記複数の光源から発せられた光の光量を各別に検出すると共に、当該検出された検出光量と前記目標光量とを色毎に比較して、前記検出光量が前記目標光量に一致するように前記複数の光源それぞれに供給する電流を調整する第一制御と、
前記第一制御の実行中、少なくとも一つの前記光源に供給される電流が前記第一閾値電流を超えた場合には、当該第一制御の終了後に前記目標光量の値を低下させる第二制御とを含むことを特徴とする。 Further, the present invention is a method for controlling a light source device including a plurality of light sources having different colors of emitted light,
Each value of the target light amount and the first threshold current is stored for each of the plurality of light sources,
The amount of light emitted from the plurality of light sources is detected separately, and the detected amount of light detected and the target amount of light are compared for each color so that the detected amount of light matches the target amount of light. A first control for adjusting the current supplied to each of the plurality of light sources;
During the execution of the first control, when the current supplied to at least one of the light sources exceeds the first threshold current, a second control for reducing the value of the target light amount after the end of the first control; It is characterized by including.
本発明の光源装置によれば、光源から射出される光量が所定の目標光量に一致するように制御している期間内においては、照度と色度を一定に保つことが可能となる。このため、かかる光源装置を投射用の光源装置に利用した場合には、映像の投射中に色度や照度が低下するといった事態の招来が抑制される。
According to the light source device of the present invention, it is possible to keep the illuminance and chromaticity constant during a period in which the amount of light emitted from the light source is controlled to coincide with a predetermined target amount of light. For this reason, when such a light source device is used as a light source device for projection, the occurrence of a situation in which chromaticity or illuminance decreases during image projection is suppressed.
本発明の光源装置及びプロジェクタにつき、図面を参照して説明する。
The light source device and projector of the present invention will be described with reference to the drawings.
図1は、本実施形態の光源装置を含むプロジェクタの構成を模式的に示すブロック図である。図1に示すプロジェクタ10は、光源装置1と光源装置から射出された光を投射する光学系2を含む。なお、図1には、このプロジェクタ10からの映像が投射されるスクリーン3も併せて図示されている。
FIG. 1 is a block diagram schematically showing a configuration of a projector including the light source device of the present embodiment. A projector 10 shown in FIG. 1 includes a light source device 1 and an optical system 2 that projects light emitted from the light source device. FIG. 1 also shows a screen 3 on which an image from the projector 10 is projected.
光源装置1は、光源部11、光検出部12、及び制御部13を備える。光源部11は、赤色光を発する光源11R、緑色光を発する光源11G、及び青色光を発する光源11Bを備える。各光源(11R,11G,11B)は、LED素子やレーザダイオード素子といった固体光源素子を含む構成である。
The light source device 1 includes a light source unit 11, a light detection unit 12, and a control unit 13. The light source unit 11 includes a light source 11R that emits red light, a light source 11G that emits green light, and a light source 11B that emits blue light. Each light source (11R, 11G, 11B) includes a solid light source element such as an LED element or a laser diode element.
なお、本実施形態では、光源部11が3色の光を発する光源で構成されている場合について説明するが、色数については3に限定されるものではない。また、各光源が、固体光源素子に加えて公知の波長変換素子を含む構成であっても構わない。例えば、光源11Gが、赤外光を発するレーザダイオード素子と、当該赤外光の波長を1/2に変換するPPLN(Periodically Poled Lithium Niobat:周期分極反転ニオブ酸リチウム)等の波長変換素子を含んで構成されていても構わない。
In addition, although this embodiment demonstrates the case where the light source part 11 is comprised with the light source which emits the light of 3 colors, it is not limited to 3 about the number of colors. Each light source may be configured to include a known wavelength conversion element in addition to the solid light source element. For example, the light source 11G includes a laser diode element that emits infrared light and a wavelength conversion element such as PPLN (Periodically Poled Lithium Niobat) that converts the wavelength of the infrared light to ½. You may be comprised by.
光源部11は、制御部13によって駆動制御される。より詳細には、光源部11は、各光源駆動用の電源を備えており、制御部13によってこの電源から各光源(11R,11G,11B)に対して供給される電流量を別個に制御することができる構成である。
The light source unit 11 is driven and controlled by the control unit 13. More specifically, the light source unit 11 includes a power source for driving each light source, and the control unit 13 separately controls the amount of current supplied from the power source to each light source (11R, 11G, 11B). It is a configuration that can.
光検出部12は、各光源(11R,11G,11B)から発せられた光の光量を各別に検出することができる構成である。より詳細には、光検出部12は、光源11Rから射出された光の一部を検出する光検出部12R、光源11Gから射出された光の一部を検出する光検出部12G、及び光源11Bから射出された光の一部を検出する光検出部12Bを備える。
The light detection unit 12 is configured to be able to detect the amount of light emitted from each light source (11R, 11G, 11B). More specifically, the light detection unit 12 detects a part of the light emitted from the light source 11R, a light detection unit 12R that detects a part of the light emitted from the light source 11G, and a light source 11B. The light detection part 12B which detects a part of light inject | emitted from is provided.
なお、図1に示す実施形態では、光源11Rから射出された光が光学系2に向かう光路上に一部反射ミラー14Rが設置され、このミラー14Rを通じて反射された光が光検出部12Rに向けて進行する構成である。緑色光及び青色光についても同様である。光源11Gから射出された光が光学系2に向かう光路上に一部反射ミラー14Gが設置され、このミラー14Gを通じて反射された光が光検出部12Gに向けて進行する。光源11Bから射出された光が光学系2に向かう光路上に一部反射ミラー14Bが設置され、このミラー14Bを通じて反射された光が光検出部12Bに向けて進行する。
In the embodiment shown in FIG. 1, a partially reflecting mirror 14R is installed on the optical path of the light emitted from the light source 11R toward the optical system 2, and the light reflected through the mirror 14R is directed toward the light detection unit 12R. This is a configuration that proceeds. The same applies to green light and blue light. A partially reflecting mirror 14G is installed on the optical path of the light emitted from the light source 11G toward the optical system 2, and the light reflected through the mirror 14G travels toward the light detection unit 12G. A partially reflecting mirror 14B is installed on the optical path of the light emitted from the light source 11B toward the optical system 2, and the light reflected through the mirror 14B travels toward the light detection unit 12B.
このように、光検出部12は各光源(11R,11G,11B)から発せられた光の光量を各別に検出すると、この検出光量に関する情報を制御部13に与える。制御部13は、各光源(11R,11G,11B)のそれぞれに関して、目標光量の値及び所定の閾値電流(「第一閾値電流」に対応する。)の値を記憶している。
As described above, when the light detection unit 12 detects the amount of light emitted from each light source (11R, 11G, 11B) separately, it gives the control unit 13 information on the detected light amount. The control unit 13 stores a target light amount value and a predetermined threshold current (corresponding to “first threshold current”) for each of the light sources (11R, 11G, and 11B).
以下、制御部13によって行われる制御内容につき、図2に示すフローチャートを参照しながら説明する。
Hereinafter, the control contents performed by the control unit 13 will be described with reference to the flowchart shown in FIG.
光源装置1の電源が入ると、制御部13による制御が開始される。制御部13は、まず目標光量の値を変更する必要があるかどうかの判断を行う(ステップS1)。ここでは、目標光量の値の変更の必要がない場合(ステップS1においてNo)についてまず説明する。目標光量の値の変更の必要がある場合については、目標光量の値を変更するステップの後に説明される。
When the light source device 1 is turned on, control by the control unit 13 is started. The control unit 13 first determines whether or not it is necessary to change the value of the target light amount (step S1). Here, the case where there is no need to change the value of the target light amount (No in step S1) will be described first. The case where the target light amount value needs to be changed will be described after the step of changing the target light amount value.
制御部13は、色毎に記憶されている目標光量の値を読み出す(ステップS2A)。そして、制御部13は、光検出部12(12R,12G,12B)から色毎の検出光量の値を取得する(ステップS3)。そして、制御部13は、ステップS2で読み出した目標光量の値と、ステップS3で取得された検出光量の値を色ごとに比較する(ステップS4)。
The control unit 13 reads the value of the target light amount stored for each color (step S2A). And the control part 13 acquires the value of the detected light quantity for every color from the light detection part 12 (12R, 12G, 12B) (step S3). And the control part 13 compares the value of the target light quantity read by step S2 with the value of the detected light quantity acquired by step S3 for every color (step S4).
そして、制御部13は、検出光量の値が目標光量の値に一致するように、色毎に光源(11R,11G,11B)に対して供給される電流量を調整する(ステップS5)。すなわち、制御部13は、色毎に検出光量の値と目標光量の値を比較し、一致していれば(ステップS4においてYes)、当該色に対応する光源への供給電流量を変化させない。他方、制御部13は、色毎に検出光量の値と目標光量の値を比較し、一致していなければ(ステップS4においてNo)、当該色に対応する光源への供給電流量を変化させる。より詳細には、検出光量が目標光量よりも高い値を示していれば、制御部13は対象となる光源に対する供給電流量を低下させる制御を行い、検出光量が目標光量よりも低い値を示していれば、制御部13は対象となる光源に対する供給電流量を上昇させる制御を行う。
And the control part 13 adjusts the electric current amount supplied with respect to the light source (11R, 11G, 11B) for every color so that the value of detected light quantity may correspond with the value of target light quantity (step S5). That is, the control unit 13 compares the detected light amount value with the target light amount value for each color, and if they match (Yes in step S4), does not change the amount of current supplied to the light source corresponding to the color. On the other hand, the control unit 13 compares the value of the detected light amount and the value of the target light amount for each color, and if they do not match (No in step S4), changes the amount of current supplied to the light source corresponding to the color. More specifically, if the detected light quantity is higher than the target light quantity, the control unit 13 performs control to reduce the amount of current supplied to the target light source, and the detected light quantity shows a value lower than the target light quantity. If so, the control unit 13 performs control to increase the amount of current supplied to the target light source.
制御部13は、各光源(11R,11G,11B)に対して供給される電流量を各別に取得する(ステップS6)。そして、制御部13は、色毎に記憶されている第一閾値電流量の値を読み出すと共に、ステップS6において色毎に取得した各光源への供給電流量との大小関係を比較する(ステップS7)。
Control unit 13 acquires the amount of current supplied to each light source (11R, 11G, 11B) separately (step S6). Then, the control unit 13 reads the value of the first threshold current amount stored for each color, and compares the magnitude relationship with the amount of current supplied to each light source acquired for each color in step S6 (step S7). ).
全ての色において、各光源への供給電流量が対応する第一閾値電流以下である場合(ステップS7においてYes)、制御部13は、再びステップS3-S7の各ステップを繰り返し実行する。一方、少なくとも一以上の色において、光源への供給電流量が対応する第一閾値電流を上回っている場合(ステップS7においてNo)、制御部13は、当該色の光源については、次回の制御期間において目標光量の値を低下させる旨を記憶させると共に(ステップS8)、再びステップS3-S7の各ステップを繰り返し実行する。
In all colors, when the amount of current supplied to each light source is equal to or less than the corresponding first threshold current (Yes in step S7), the control unit 13 repeatedly executes each step of steps S3-S7. On the other hand, when the supply current amount to the light source exceeds the corresponding first threshold current in at least one or more colors (No in step S7), the control unit 13 determines the next control period for the light source of the color. In step S8, the fact that the target light amount value is to be decreased is stored (step S8), and steps S3-S7 are repeated.
ここで、説明のために、光源11R、光源11G、及び光源11Bに設定されていた第一閾値電流の値が、それぞれRI1、GI1、及びBI1であるものとする。また、ある制御期間T1において、光源11R、光源11G、及び光源11Bに設定されていた目標光量の値が、それぞれRL1、GL1、及びBL1であるものとする。そして、当該制御期間T1内における所定の時点において、光源11Bに供給される電流量Ibが、当該光源11Bに設定されていた第一閾値電流BI1を上回った場合を想定する。また、他の光源の電流量についてはいずれも対応する第一閾値電流の値を上回っていない場合を想定する。すなわち、この制御期間T1において、光源11Rに供給される電流量Irは当該光源11Rに設定されていた第一閾値電流RI1を上回っておらず、光源11Gに供給される電流量Igは当該光源11Gに設定されていた第一閾値電流GI1を上回っていない場合を想定する。
Here, for the sake of explanation, it is assumed that the values of the first threshold current set in the light source 11R, the light source 11G, and the light source 11B are RI1, GI1, and BI1, respectively. Further, it is assumed that the target light amount values set in the light source 11R, the light source 11G, and the light source 11B in the certain control period T1 are RL1, GL1, and BL1, respectively. Then, it is assumed that the current amount Ib supplied to the light source 11B exceeds the first threshold current BI1 set for the light source 11B at a predetermined time point in the control period T1. Further, it is assumed that the current amounts of the other light sources do not exceed the corresponding first threshold current value. That is, during this control period T1, the current amount Ir supplied to the light source 11R does not exceed the first threshold current RI1 set for the light source 11R, and the current amount Ig supplied to the light source 11G is equal to the light source 11G. A case is assumed where the first threshold current GI1 that has been set to is not exceeded.
上記の場合、ステップS8において、制御部13は、次の制御期間(便宜上「T2」とする。)において目標光量を低下させる旨を記憶する。なお、このステップS8では、次の制御期間T2において目標光量を低下させることを記憶するのみであり、当該制御期間T1内においては、各光源11R、11G、及び11Bの目標光量は依然としてそれぞれRL1、GL1、及びBL1のままである。
In the above case, in step S8, the control unit 13 stores that the target light amount is reduced in the next control period (for convenience, “T2”). In this step S8, it is only stored that the target light amount is decreased in the next control period T2, and the target light amounts of the light sources 11R, 11G, and 11B are still RL1, It remains GL1 and BL1.
そして、この制御期間T1が終了し、再び光源装置1の制御が開始されると、すなわち制御期間T2が開始されると、制御部13は、まず各光源(11R、11G、11B)の目標光量の値を変更する必要があるかどうかの判断を行う(ステップS1)。ここでは、目標光量の値を低下させる必要があるため(ステップS1においてYes)、制御部13は、各光源(11R、11G、11B)に対して現時点で設定されている目標光量の値を低下させる制御を行う(ステップS2B)。
When the control period T1 ends and the control of the light source device 1 is started again, that is, when the control period T2 is started, the control unit 13 firstly sets the target light amount of each light source (11R, 11G, 11B). It is determined whether or not it is necessary to change the value of (step S1). Here, since it is necessary to decrease the value of the target light amount (Yes in step S1), the control unit 13 decreases the value of the target light amount currently set for each light source (11R, 11G, 11B). Control is performed (step S2B).
ここで、上述した例では、制御期間T1内において、光源11Bに供給される電流量Ibのみが対応する第一閾値電流BI1を上回っており、他の光源(11R,11G)に供給される電流量(Ir,Ig)については、それぞれ対応する第一閾値電流(RI1,GI1)を上回っていない。しかし、この制御期間T2のステップS2Bにおいて、制御部13は、全ての光源(11R、11G、11B)に対して目標光量の値を低下させる制御を行う。ここで新たに設定された光源11R、11G、11Bの目標光量の値を、それぞれRL2、GL2、及びBL2とする。
Here, in the above-described example, only the current amount Ib supplied to the light source 11B exceeds the corresponding first threshold current BI1 within the control period T1, and the current supplied to the other light sources (11R, 11G). The amount (Ir, Ig) does not exceed the corresponding first threshold current (RI1, GI1). However, in step S2B of the control period T2, the control unit 13 performs control to reduce the value of the target light amount for all the light sources (11R, 11G, 11B). Here, the values of the target light amounts of the newly set light sources 11R, 11G, and 11B are RL2, GL2, and BL2, respectively.
以下は、上述したのと同様に、制御部13は、ステップS3-S8を実行する。
Hereinafter, as described above, the control unit 13 executes steps S3 to S8.
制御部13がこのような制御を行うことで、所定の期間内、より詳細には、制御部13が各光源(11R,11G,11B)から射出される光量を所定の光量に保持するように制御している期間内(制御期間内)においては、照度及び色度を保持することができる点につき、図3のグラフを参照して説明する。
When the control unit 13 performs such control, the control unit 13 holds the light amount emitted from each light source (11R, 11G, 11B) at a predetermined light amount within a predetermined period. The fact that the illuminance and chromaticity can be maintained within the controlled period (within the control period) will be described with reference to the graph of FIG.
図3は、各制御期間内における各光源(11R,11G,11B)に対する供給電流量及び各光源の発光光量の時間的な変化を模式的に示すグラフである。なお、ここでは、上述したように、制御期間T1において、青色の光源11Bのみ供給電流量Ibが第一閾値電流BI1を上回っており、他の光源については供給電流量が第一閾値電流を上回っていないものとする。これは、例えば青色の光源11Bが他の光源(11R,11G)に比べて劣化が進んでいるような場合に対応する。
FIG. 3 is a graph schematically showing temporal changes in the amount of current supplied to each light source (11R, 11G, 11B) and the amount of light emitted from each light source within each control period. Here, as described above, in the control period T1, the supply current amount Ib of only the blue light source 11B exceeds the first threshold current BI1, and the supply current amount of the other light sources exceeds the first threshold current. Shall not. For example, this corresponds to a case where the blue light source 11B is more deteriorated than the other light sources (11R, 11G).
なお、図3では、制御期間T0、T1、T2及びT3について図示している。すなわち、図3では、制御期間T0では青色の光源11Bについても、供給電流量Ibが第一閾値電流BI1を上回らず、制御期間T1において初めて供給電流量Ibが第一閾値電流BI1を上回った場合が示されている。
In FIG. 3, the control periods T0, T1, T2, and T3 are illustrated. That is, in FIG. 3, the supply current amount Ib does not exceed the first threshold current BI1 for the blue light source 11B in the control period T0, and the supply current amount Ib exceeds the first threshold current BI1 for the first time in the control period T1. It is shown.
制御期間T0において、光源11Bへの供給電流量Ibは時間経過と共に上昇している。これは、光源11R,11Gと比べて光源11Bの劣化が進行している場合に対応している。すなわち、光源(11R,11G,11B)が劣化すると、同一の供給電流量の下での発光量が低下するため、目標光量(RL1,GL1,BL1)を実現するためには供給電流量を上昇しなければならない。素子の劣化は時間の経過と共に進行するため、光源11Bにおいては供給電流量も時間の経過と共に上昇している。なお、光源11R、11Gについては、ほとんど素子の劣化が進行していないため、各光源に対する供給電流量(Ir,Ig)についてはほとんど一定である。
In the control period T0, the amount of current Ib supplied to the light source 11B increases with time. This corresponds to the case where the deterioration of the light source 11B is progressing compared to the light sources 11R and 11G. That is, if the light source (11R, 11G, 11B) deteriorates, the light emission amount under the same supply current amount decreases, so the supply current amount is increased to achieve the target light amount (RL1, GL1, BL1). Must. Since the deterioration of the element proceeds with the passage of time, the supply current amount in the light source 11B also increases with the passage of time. Note that, with respect to the light sources 11R and 11G, since the element hardly deteriorates, the amount of current supplied to each light source (Ir, Ig) is almost constant.
なお、一つの制御期間は、例えば光源装置1に対して電源を投入した時点から、電源投入を解除した時点までとすることができる。また、別の例として、プロジェクタ10を映画の上映用に利用する場合においては、一つの制御期間を一つの映画の上映期間に設定することができる。後者の場合、例えば映画館において、制御期間T0の間に、ある映画M0が上映され、所定のインターバルを経て、次の制御期間T1の間に、別の映画M1が上映されるものとすることができる。
Note that one control period can be, for example, from when the power source is turned on to the light source device 1 until when the power source is released. As another example, when the projector 10 is used for movie screening, one control period can be set as one movie screening period. In the latter case, for example, in a movie theater, a movie M0 is shown during the control period T0, and another movie M1 is shown during the next control period T1 after a predetermined interval. Can do.
上述したように、本実施形態の例では、制御期間T1内において、光源11Bへの供給電流量Ibが第一閾値電流BI1を上回っている。このため、次の制御期間T2においては、全ての光源11R、11G、及び11Bの目標光量は、それぞれ制御期間T1におけるRL1、GL1、BL1から低下して、RL2、GL2、BL2に設定されている。
As described above, in the example of this embodiment, the supply current amount Ib to the light source 11B exceeds the first threshold current BI1 within the control period T1. For this reason, in the next control period T2, the target light amounts of all the light sources 11R, 11G, and 11B are decreased from RL1, GL1, and BL1 in the control period T1, respectively, and are set to RL2, GL2, and BL2. .
目標光量が低下すると、当然に当該光量を実現するために光源に供給すべき電流量も低下する。これは、光源11Bのみに限らず、光源11R及び光源11Gについても同様である。光源11R及び光源11Gに関して、制御期間T2内での発光光量及び供給電流量が、それぞれ制御期間T1に比べて低下していることが図3に図示されている。
When the target light amount decreases, the amount of current that should be supplied to the light source in order to realize the light amount naturally decreases. This applies not only to the light source 11B but also to the light source 11R and the light source 11G. As for the light source 11R and the light source 11G, FIG. 3 shows that the amount of emitted light and the amount of supplied current in the control period T2 are lower than those in the control period T1, respectively.
そして、光源11Bについても、制御期間T2内では制御期間T1よりも供給電流量及び発光光量が低下する。ここで、本実施形態では、図3に示されるように、光源11Bに供給される電流量Ibが、制御期間T2内においては第一閾値電流BI1を下回っている。つまり、この場合、次の制御期間T3においては、各光源(11R,11G,11B)の目標光量は、制御期間T2と同じ値に設定される。
And also in the light source 11B, the amount of supplied current and the amount of emitted light are lower in the control period T2 than in the control period T1. Here, in the present embodiment, as shown in FIG. 3, the current amount Ib supplied to the light source 11B is lower than the first threshold current BI1 within the control period T2. That is, in this case, in the next control period T3, the target light amount of each light source (11R, 11G, 11B) is set to the same value as in the control period T2.
そして、図3の例では、制御期間T3において、再び光源11Bに供給される電流量Ibが第一閾値電流BI1を上回っている。このため制御期間T3の終了後に、各光源の(11R,11G,11B)の目標光量は制御期間T3から低下した値に設定される。
In the example of FIG. 3, the current amount Ib supplied to the light source 11B again exceeds the first threshold current BI1 in the control period T3. For this reason, after the end of the control period T3, the target light amount of (11R, 11G, 11B) of each light source is set to a value decreased from the control period T3.
図3に示されるように、劣化した光源(ここでは光源11B)が存在する場合、当該光源に供給される電流量の上昇速度は他の光源よりも速くなる。しかし、本実施形態の光源装置1によれば、制御期間内において光源に対して供給される電流量が第一閾値電流を超えた場合には、以後の制御期間において目標光量が低下されるため、この時点における供給電流量も低下する。この結果、光源11Bに対して供給される電流量Ibを第二閾値電流BI2に達しないようにすることができる。なお、劣化していない、又は劣化が進行してない光源(11R,11G)については、無論、供給電流量が第二閾値電流に達するということはない。
As shown in FIG. 3, when a deteriorated light source (here, the light source 11B) is present, the rate of increase in the amount of current supplied to the light source is faster than other light sources. However, according to the light source device 1 of the present embodiment, when the amount of current supplied to the light source within the control period exceeds the first threshold current, the target light amount is reduced in the subsequent control period. The supply current amount at this time also decreases. As a result, the amount of current Ib supplied to the light source 11B can be prevented from reaching the second threshold current BI2. For the light sources (11R, 11G) that are not degraded or have not progressed, of course, the amount of supplied current does not reach the second threshold current.
そして、光源装置1では、各制御期間(T0,T1,T2,T3)内においては、目標光量値は一定に保たれている。よって、制御部13によって制御が実行されている間、より詳細には、制御部13が各光源(11R,11G,11B)から射出される光量を所定の光量に保持するように制御している期間内においては、各光源からの発光光量は一定に保たれている。よって、各制御期間内において、照度や色度が変化するということはない。
In the light source device 1, the target light amount value is kept constant within each control period (T0, T1, T2, T3). Therefore, more specifically, while the control is being performed by the control unit 13, the control unit 13 controls the light amount emitted from each light source (11R, 11G, 11B) to be held at a predetermined light amount. Within the period, the amount of light emitted from each light source is kept constant. Therefore, the illuminance and chromaticity do not change within each control period.
更に、光源装置1では、ある制御期間内(ここでは期間T1)においてある光源(ここでは光源11B)につき、供給電流量が第一閾値電流を超えた場合、後の制御期間では、この光源のみならず、他の光源についても目標光量が低下される。これは、目標光量を変更するに当たって、各光源からの発光光量の比率を一定又は実質的に一定に保つことができることを意味している。すなわち、目標光量が変化される前後の制御期間(ここでは制御期間T1とT2)にわたって、色度を保持することができる。
Further, in the light source device 1, when the supply current amount exceeds the first threshold current for a certain light source (here, the light source 11 </ b> B) within a certain control period (here, the period T <b> 1), only this light source is used in the later control period. In addition, the target light amount is reduced for other light sources. This means that, when changing the target light amount, the ratio of the light emission amount from each light source can be kept constant or substantially constant. That is, chromaticity can be maintained over a control period (here, control periods T1 and T2) before and after the target light amount is changed.
この制御方法によれば、制御期間T1と制御期間T2とでは、発光光量が異なるため、プロジェクタ10として利用した場合に、スクリーン3上に投射される画像の照度は異なる。ただし、各制御期間を例えば映画の上映期間に対応させた場合、本発明のプロジェクタ10によれば、映画の上映中に画像の照度が変化するということはないため、従来の構成と違って、観察者が上映中に照度が低下したことを認識することはない。
According to this control method, the amount of emitted light is different between the control period T1 and the control period T2, and thus when used as the projector 10, the illuminance of the image projected on the screen 3 is different. However, when each control period corresponds to a movie screening period, for example, according to the projector 10 of the present invention, the illuminance of the image does not change during the movie screening. The observer does not recognize that the illuminance has decreased during the screening.
なお、上述したように、第一閾値電流(RI1,GI1,BI1)に関する情報は、予め制御部13が記憶しているものとして構わない。ここで、各第一閾値電流の値は、各光源(11R,11G,11B)が劣化した場合における供給電流量の上昇速度と、想定される制御期間(T1,T2等)の長さに応じて予め設定されているものとすることができる。例えば、光源装置1をプロジェクタ3用の光源として、このプロジェクタ3を映画館で利用する場合、各制御期間は上述したように1回の映画の上映時間に対応する。そして、映画の上映時間は、一般的におおよその範囲内(例えば1.5時間以上4時間以内)で構成される。よって、制御期間の開始直後において、光源に対する供給電流量が第一閾値電流の値であった場合に、制御期間の終了時点において、当該光源に対する供給電流量が第二閾値電流以下に収まるよう、第一閾値電流の値を設定するのが好ましい。
As described above, the information regarding the first threshold current (RI1, GI1, BI1) may be stored in advance by the control unit 13. Here, the value of each first threshold current depends on the rising speed of the supply current amount when each light source (11R, 11G, 11B) deteriorates and the length of the assumed control period (T1, T2, etc.). Can be set in advance. For example, when the light source device 1 is used as a light source for the projector 3 and the projector 3 is used in a movie theater, each control period corresponds to one movie showing time as described above. The movie show time is generally configured within an approximate range (for example, 1.5 hours to 4 hours). Therefore, immediately after the start of the control period, when the amount of current supplied to the light source is the value of the first threshold current, at the end of the control period, the amount of current supplied to the light source falls below the second threshold current. It is preferable to set the value of the first threshold current.
更に、ステップS2Bにおける各光源(11R,11G,11B)の目標光量の低下幅としては、例えば低下した目標光量の下で制御が開始された直後における光源に供給される電流が第一閾値電流以下になるように設定されるのが好ましい。かかる構成とすることで、新たな目標光量によって、劣化した光源への供給電流量を、第二閾値電流に近づけない範囲ように低下させることができるためである。
Furthermore, as the reduction width of the target light amount of each light source (11R, 11G, 11B) in step S2B, for example, the current supplied to the light source immediately after the control is started under the reduced target light amount is equal to or less than the first threshold current. It is preferable to set so as to be. This is because the amount of current supplied to the deteriorated light source can be reduced to a range that does not approach the second threshold current by using a new target light amount.
なお、図1に示すプロジェクタ10が備える光学系2の構成は、公知の光学系を用いることができる。一例として、プロジェクタ10は、各光源(11R,11G,11B)からの射出光を光画像にする空間変調素子21(21R,21G,21B)と、各空間変調素子21から射出された光画像を合成する色合成光学系22と、色合成光学系22から射出された光画像を拡大してスクリーン3に投射する投射光学系23とを備えて構成される。なお、空間変調素子21は、例えばデジタルマイクロミラーデバイスや液晶表示デバイスで構成され、色合成光学系22は例えばダイクロイックプリズム等の色合成プリズムで構成され、投射光学系23は例えば投射レンズで構成される。
In addition, a well-known optical system can be used for the structure of the optical system 2 with which the projector 10 shown in FIG. 1 is provided. As an example, the projector 10 includes a spatial modulation element 21 (21R, 21G, 21B) that converts light emitted from each light source (11R, 11G, 11B) into an optical image, and a light image emitted from each spatial modulation element 21. A color synthesizing optical system 22 for synthesizing and a projection optical system 23 for enlarging and projecting the light image emitted from the color synthesizing optical system 22 onto the screen 3 are configured. The spatial modulation element 21 is composed of, for example, a digital micromirror device or a liquid crystal display device, the color composition optical system 22 is composed of a color composition prism such as a dichroic prism, and the projection optical system 23 is composed of, for example, a projection lens. The
なお、上述した実施形態では、青色の光源11Bのみ劣化が進行している場合を採り上げて説明したが、他の色についても同様の議論が可能であるため、説明を省略する。
In the above-described embodiment, the case where only the blue light source 11B is deteriorated has been described. However, the same discussion is possible for other colors, and thus the description thereof is omitted.
[別実施形態]
以下において、別実施形態につき説明する。 [Another embodiment]
In the following, another embodiment will be described.
以下において、別実施形態につき説明する。 [Another embodiment]
In the following, another embodiment will be described.
〈1〉 図4に示すように、光検出部12(12R,12G,12B)が、対象とする色の光を透過して、他の色の光を透過しないフィルタ(16R,16G,16B)を備える構成とすることができる。そして、この場合において、光源装置1は、ダイクロイックミラー15R,15G及び一部反射ミラー14Bを備えることで、各光源(11R,11G,11B)からの射出光の一部が重ね合わせられた状態で光検出部12へと進行するものとしても構わない。この場合においても、光検出部12R,12G,12Bはそれぞれ光源11R,11G,11Bからの射出光量に対応した光の量を検知することができる。
<1> As shown in FIG. 4, filters (16R, 16G, 16B) in which the light detection unit 12 (12R, 12G, 12B) transmits light of a target color and does not transmit light of other colors. It can be set as the structure provided with. In this case, the light source device 1 includes the dichroic mirrors 15R and 15G and the partial reflection mirror 14B, so that a part of the light emitted from each light source (11R, 11G, and 11B) is superimposed. It does not matter even if it proceeds to the light detection unit 12. Even in this case, the light detection units 12R, 12G, and 12B can detect the amounts of light corresponding to the amounts of light emitted from the light sources 11R, 11G, and 11B, respectively.
〈2〉上述した実施形態では、制御期間T1において光源11Bに供給される電流量が第一閾値電流BI1を超過した場合につき、次の制御期間T2において、各光源11R、11G、11Bの目標光量を、制御期間T1より低下させる場合について説明した。制御部13においては、このような制御を行うことが好ましいが、本発明に係る光源装置1が行う制御内容はこの態様に限られない。例えば、上記の例では、制御期間T1において光源11Bに供給される電流量が第一閾値電流BI1を超過しているが、直後の制御期間T2ではなく、その次の制御期間T3や又はそれより数回後の制御期間内において、はじめて目標光量を低下させても構わない。
<2> In the embodiment described above, when the amount of current supplied to the light source 11B exceeds the first threshold current BI1 in the control period T1, the target light amount of each of the light sources 11R, 11G, and 11B in the next control period T2. Has been described for the case of lowering than the control period T1. Although it is preferable to perform such control in the control part 13, the control content which the light source device 1 which concerns on this invention performs is not restricted to this aspect. For example, in the above example, the amount of current supplied to the light source 11B in the control period T1 exceeds the first threshold current BI1, but not the control period T2 immediately after, but the next control period T3 or more. The target light amount may be decreased for the first time within the control period after several times.
1 : 光源装置
2 : 光学系
3 : スクリーン
10 : プロジェクタ
11 : 光源部
11R,11G,11B : 光源
12 : 光検出部
12R,12G,12B : 光検出部
13 : 制御部
14R,14G,14B : 一部反射ミラー
15R,15G : ダイクロイックミラー
16R,16G,16B : フィルタ
21 : 空間変調素子
21R,21G,21B : 空間変調素子
22 : 色合成光学系
23 : 投射光学系
1: Light source device 2: Optical system 3: Screen 10: Projector 11: Light source unit 11R, 11G, 11B: Light source 12: Light detection unit 12R, 12G, 12B: Light detection unit 13: Control unit 14R, 14G, 14B: One Partial reflection mirror 15R, 15G: Dichroic mirror 16R, 16G, 16B: Filter 21: Spatial modulation element 21R, 21G, 21B: Spatial modulation element 22: Color synthesizing optical system 23: Projection optical system
2 : 光学系
3 : スクリーン
10 : プロジェクタ
11 : 光源部
11R,11G,11B : 光源
12 : 光検出部
12R,12G,12B : 光検出部
13 : 制御部
14R,14G,14B : 一部反射ミラー
15R,15G : ダイクロイックミラー
16R,16G,16B : フィルタ
21 : 空間変調素子
21R,21G,21B : 空間変調素子
22 : 色合成光学系
23 : 投射光学系
1: Light source device 2: Optical system 3: Screen 10: Projector 11:
Claims (6)
- 発せられる光の色が相互に異なる複数の光源と、
前記複数の光源から発せられた光の光量を各別に検出する光検出部と、
前記複数の光源に供給される電流を調整することで前記複数の光源から発せられる光の光量を制御する制御部とを備え、
前記制御部は、
前記複数の光源のそれぞれに関して目標光量及び第一閾値電流の各値を記憶しており、
前記光検出部で検出された検出光量と前記目標光量とを色毎に比較して、前記検出光量が前記目標光量に一致するように前記複数の光源それぞれに供給される電流を調整する第一制御を行い、
前記第一制御の実行中、少なくとも一つの前記光源に供給される電流が前記第一閾値電流を超えた場合には、当該第一制御の終了後に前記複数の光源のそれぞれの前記目標光量の値を低下させる第二制御を行うことを特徴とする光源装置。 A plurality of light sources having different colors of emitted light, and
A light detection unit that individually detects the amount of light emitted from the plurality of light sources;
A controller that controls the amount of light emitted from the plurality of light sources by adjusting the current supplied to the plurality of light sources;
The controller is
Each value of the target light amount and the first threshold current is stored for each of the plurality of light sources,
The detected light amount detected by the light detection unit and the target light amount are compared for each color, and the current supplied to each of the plurality of light sources is adjusted so that the detected light amount matches the target light amount Control
When the current supplied to at least one of the light sources exceeds the first threshold current during execution of the first control, the value of the target light amount of each of the plurality of light sources after the end of the first control. A second light source device for reducing the light is performed. - 前記第一閾値電流は、前記複数の光源のそれぞれにおける定格電流又は物理的特性に影響を与えない範囲内で前記複数の光源のそれぞれに供給可能な最大電流、に対応する第二閾値電流よりも低い値であることを特徴とする請求項1に記載の光源装置。 The first threshold current is higher than a second threshold current corresponding to a maximum current that can be supplied to each of the plurality of light sources within a range that does not affect a rated current or physical characteristics of each of the plurality of light sources. The light source device according to claim 1, wherein the light source device has a low value.
- 前記制御部は、第一期間にわたって前記第一制御を行った後、第二期間にわたって前記第一制御を停止するというサイクルを複数回繰り返す構成であり、
前記第一閾値電流は、前記第一期間の開始時に前記光源に対して当該第一閾値電流が供給された場合に、当該第一期間内に前記光源に対して供給される電流量が前記第二閾値電流を超えないように設定されていることを特徴とする請求項2に記載の光源装置。 The controller is configured to repeat a cycle of stopping the first control over a second period a plurality of times after performing the first control over a first period,
When the first threshold current is supplied to the light source at the start of the first period, the first threshold current is the amount of current supplied to the light source within the first period. The light source device according to claim 2, wherein the light source device is set so as not to exceed two threshold currents. - 前記制御部は、前記第二制御によって前記目標光量の値を低下させた後の前記第一制御の開始直後における前記光源に供給される電流が前記第一閾値電流以下になるように、前記第二制御における前記目標光量の値の下げ幅を設定していることを特徴とする請求項2又は3に記載の光源装置。 The control unit is configured so that a current supplied to the light source immediately after the start of the first control after the value of the target light amount is decreased by the second control is equal to or less than the first threshold current. 4. The light source device according to claim 2, wherein a reduction range of the value of the target light amount in two controls is set.
- 請求項1~4のいずれか1項に記載の光源装置と、
前記光源装置から射出された光を投射する光学系とを含むことを特徴とするプロジェクタ。 The light source device according to any one of claims 1 to 4,
An optical system that projects light emitted from the light source device. - 発せられる光の色が相互に異なる複数の光源を含む光源装置の制御方法であって、
前記複数の光源のそれぞれに関して目標光量及び第一閾値電流の各値が記憶されており、
前記複数の光源から発せられた光の光量を各別に検出すると共に、当該検出された検出光量と前記目標光量とを色毎に比較して、前記検出光量が前記目標光量に一致するように前記複数の光源それぞれに供給する電流を調整する第一制御と、
前記第一制御の実行中、少なくとも一つの前記光源に供給される電流が前記第一閾値電流を超えた場合には、当該第一制御の終了後に前記目標光量の値を低下させる第二制御とを含むことを特徴とする光源装置の制御方法。 A method of controlling a light source device including a plurality of light sources having different colors of emitted light,
Each value of the target light amount and the first threshold current is stored for each of the plurality of light sources,
The amount of light emitted from the plurality of light sources is detected separately, and the detected amount of light detected and the target amount of light are compared for each color so that the detected amount of light matches the target amount of light. A first control for adjusting the current supplied to each of the plurality of light sources;
During the execution of the first control, when the current supplied to at least one of the light sources exceeds the first threshold current, a second control for reducing the value of the target light amount after the end of the first control; A control method for a light source device, comprising:
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CN113795745A (en) * | 2019-05-13 | 2021-12-14 | 河北光源解决方案株式会社 | Light source device and optical device |
CN113795745B (en) * | 2019-05-13 | 2024-07-30 | 河北光源解决方案株式会社 | Light source device and optical device |
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JP2003005714A (en) * | 2001-06-18 | 2003-01-08 | Sony Corp | Device and method for controlling light source, and projection type display device |
JP2009110827A (en) * | 2007-10-31 | 2009-05-21 | Iwasaki Electric Co Ltd | Led light source device |
JP2010021130A (en) * | 2008-06-12 | 2010-01-28 | Panasonic Corp | Lamp lighting system |
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JP2003005714A (en) * | 2001-06-18 | 2003-01-08 | Sony Corp | Device and method for controlling light source, and projection type display device |
JP2009110827A (en) * | 2007-10-31 | 2009-05-21 | Iwasaki Electric Co Ltd | Led light source device |
JP2010021130A (en) * | 2008-06-12 | 2010-01-28 | Panasonic Corp | Lamp lighting system |
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CN113795745A (en) * | 2019-05-13 | 2021-12-14 | 河北光源解决方案株式会社 | Light source device and optical device |
US20220221396A1 (en) * | 2019-05-13 | 2022-07-14 | Kahoku Lighting Solutions Corporation | Light source device and optical device |
US11927528B2 (en) | 2019-05-13 | 2024-03-12 | Kahoku Lighting Solutions Corporation | Light source device and optical device |
CN113795745B (en) * | 2019-05-13 | 2024-07-30 | 河北光源解决方案株式会社 | Light source device and optical device |
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