JP2008261998A - Light source device and projector - Google Patents

Light source device and projector Download PDF

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Publication number
JP2008261998A
JP2008261998A JP2007104056A JP2007104056A JP2008261998A JP 2008261998 A JP2008261998 A JP 2008261998A JP 2007104056 A JP2007104056 A JP 2007104056A JP 2007104056 A JP2007104056 A JP 2007104056A JP 2008261998 A JP2008261998 A JP 2008261998A
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Japan
Prior art keywords
light
light source
illumination
optical path
led
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Ceased
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JP2007104056A
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Japanese (ja)
Inventor
Yamato Goudo
大和 合渡
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Olympus Corp
オリンパス株式会社
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Priority to JP2007104056A priority Critical patent/JP2008261998A/en
Publication of JP2008261998A publication Critical patent/JP2008261998A/en
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/2066Reflectors in illumination beam
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/2006Lamp housings characterised by the light source
    • G03B21/2033LED or laser light sources
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/2053Intensity control of illuminating light

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of preventing lowering of optical efficiency and enhancing luminance in an illumination area, and a projector. <P>SOLUTION: The light source device includes: first and second light source means 11 and 12 emitting illuminating light; a light selection means 21 selecting the illuminating light emitted from either the first light source means 11 or the second light source means 12 and also forming, at least, a first optical path L1 or a second optical path L2 for guiding the selected illuminating light; and a control means 31 controlling light emission of each of the first and the second light source means 11 and 12. The control means 31 turns off the first and the second light source means 11 and 12, at least, in a transition period when the first optical path L1 and the second optical path L2 are switched, and allows the first light source means 11 to emit light in a period when the first optical path L1 is formed and allows the second light source means 12 to emit light in a period when the second optical path L2 is formed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light source device and a projector that illuminate by selectively using illumination light emitted from a plurality of light sources.

  Conventionally, various techniques for guiding light emitted from a predetermined light source to an illumination area by switching two or more optical paths have been proposed (see, for example, Patent Documents 1 to 5).

  In the above-described technique, for example, only light in a desired wavelength range is sequentially transmitted from one white light source by rotating a color wheel or mechanically switching color filters, and the illumination region is illuminated with light in two or more states. That is being done.

On the other hand, a technique using an optical semiconductor such as a light emitting diode as the predetermined light source is also known.
As a general characteristic, an optical semiconductor has a large current (a larger current than a constant current) as long as it is a pulsed current (a current that is divided into a period of time) compared to a case where a constant current is applied. The current can be driven. In this way, by driving with pulsed large current (pulse driving), a large amount of light can be instantaneously obtained from the optical semiconductor.

When the optical semiconductor is pulse-driven, it is important to adjust the duty (ratio between the period during which current is supplied to the optical semiconductor and the period during which no current is supplied).
In an optical semiconductor, the load applied to the optical semiconductor becomes smaller as the current input period becomes shorter, so that a larger current can be input. Therefore, the instantaneous light quantity obtained from the optical semiconductor can be adjusted by adjusting the duty.

In general, the duty and the current to be supplied are adjusted so that the power consumption of the optical semiconductor when the current is steadily input matches the power consumption of the pulse-driven optical semiconductor. .
JP 2000-89139 A Japanese Patent Laid-Open No. 2004-22327 JP 2003-208991 A JP 2006-23436 A JP 2006-17801 A

  However, the techniques described in Patent Documents 1 to 5 described above include some problems. The problem will be described below.

  First, problems included in the optical path switching technique using a rotating body having a transmission region and a reflection region described in Patent Documents 1 and 4 will be described with reference to FIGS.

FIG. 36 is a diagram illustrating the overall schematic configuration of the optical path switching device, and FIGS. 37 to 40 are diagrams illustrating each transition state of the rotating body in FIG. 36.
As shown in FIG. 36, the optical path switching device 70 is provided with a disk-shaped rotating body 71 that rotates around the central axis, and a first light source 75 and a second light source 76 that emit light. Yes. As shown in FIG. 37 to FIG. 40, a transmissive region 72 that transmits the irradiated light and a reflective region 73 that reflects the irradiated light are provided on the disk surface of the rotating body 71.

  As shown in FIGS. 37 to 40, the rotating body 71 switches the optical path of the light emitted from the first and second light sources 75 and 76 by rotating around the central axis. Here, a circle indicated by a broken line is a spot 74 on the optical path to which the light emitted from the first and second light sources 75 and 76 is irradiated.

  As shown in FIGS. 38 and 39, in the period when the spot 74 reaches the boundary between the transmission region 72 and the reflection region 73, the light emitted from the first light source 75 on the transmission side is hidden by the shadow of the reflection region 73. In other words, the light emitted from the second light source 76 on the reflection side leaks in the transmission region 72, causing a reduction in luminance.

  In order to suppress the above-described reduction in luminance, the first and second light sources 75 and 76 are designed to emit light simultaneously during the period when the spot 74 reaches the boundary between the transmission region 72 and the reflection region 73. However, since there is a large optical loss that the light is blocked by the reflection region 73 or leaks at the transmission region 72, the light receiving unit 77 can substantially reach only the light of one light source, and the power efficiency There was a problem that was very bad.

  Further, since the lighting duty increases by causing the first and second light sources 75 and 76 to emit light at the same time, a large current cannot be supplied to the first and second light sources 75 and 76. As a result, there is a problem that the average luminance is substantially unchanged.

41 is a graph showing the displacement of the rotating body of FIG. 36, FIGS. 42 and 43 are graphs showing the current supplied to each light source of FIG. 36, and FIG. 44 is a graph in the illumination area of FIG. It is a graph which shows the brightness.
The vertical axis in FIG. 42 and FIG. 43 is normalized with the rated current at the time of DC driving as 1. The vertical axis in FIG. 44 is normalized assuming that the brightness at the rated current is 1.
The broken lines in FIGS. 42 to 44 show the first case where the first and second light sources 75 and 76 are driven by direct current to emit light, and the two-dot chain line shows the first light source 75 and the second light source. 76 shows a second case where light is emitted alternately at a duty of 1/2 (50%), and the solid line shows a third case where light is emitted so that the light emission periods of the two light sources partially overlap in time. Show.

  Specifically, since the time integration of the broken line, the two-point difference line, and the solid line in FIG. 44 corresponds to the average brightness in the first to third cases, respectively, the second case where the duty is 50% in one cycle T In contrast, it can be seen that the brightness in the third case where the light emission periods of the two light sources overlap so that the light emission periods partially overlap does not substantially improve the brightness.

  Further, when the colors of the light emitted from the first and second light sources 75 and 76 are different, the colors are mixed by causing both the light sources 75 and 76 to emit light simultaneously. In applications that require color sequential illumination, there is a problem that the color purity decreases when such color mixture occurs.

  In addition, in this technique, when the size of the rotating body 71 is reduced, the time ratio at which the boundary between the transmission region 72 and the reflection region 73 is applied to the spot 74 is relatively increased. Therefore, the size of the rotating body 71 is reduced. There was a problem that it was difficult to do.

  In the configuration in which the optical path is selected by changing the angle of the mirror described in Patent Document 2 or Patent Document 3, the reflection angle is off the optical axis during the period until the mirror shifts to a predetermined angle, and the transition period is There was a problem that the optical efficiency was lowered.

Similarly, in the configuration described in FIG. 4 in Patent Document 3, when the light source is switched one after another, the ratio of the period in which the optical axis of the light source does not completely match the predetermined emission direction increases in principle. There was a problem that the optical efficiency was lowered.
Even when multiple states are generated from a single light source by mechanical switching such as a color wheel or color filter, the color purity can be obtained in applications that require color sequential lighting by mixing the two colors by emitting light during the transition period. There was a problem similar to that described above, such as a decrease in

In the configuration described in Patent Document 5, since the lamp always emits light, it is necessary to take measures such as providing a period during which light is shielded by the color filter in order to increase the color purity, and there is a problem that the brightness decreases. there were.
When the switching frequency is increased using these methods, the transition period is constant, whereas the period during which the optical path is truly switched is shortened. There was a problem of becoming more prominent.

  As described above, none of the proposals related to various illumination techniques having an optical system that switches the optical path in time has found an effective solution to the above-described problem relating to the transition period of the optical path.

  SUMMARY An advantage of some aspects of the invention is that it provides a light source device and a projector that can prevent a decrease in optical efficiency and increase the luminance of an illumination area.

In order to achieve the above object, the present invention provides the following means.
The present invention selects the first light source means and the second light source means for emitting the illumination light, and the illumination light emitted from any one of the first and second light source means, and the selected illumination light A light selecting unit that forms a first optical path or a second optical path that guides light and emits illumination light guided by one of the first and second optical paths to an illumination area; and the light selecting unit Control means for controlling light emission and extinction of each of the first and second light source means according to formation of the first or second optical path by the control means, and the control means includes at least the first light path means. The first and second light source means are turned off during a transition period in which the first optical path and the second optical path are switched, and the first light source means is turned on within the period during which the first optical path is formed. Before the second optical path is formed. To provide a light source device for emitting the second light source means.

According to the present invention, both the first light source corresponding to the first optical path and the second light source corresponding to the second optical path are in the transition period in which the optical efficiency decreases, that is, from the first optical path to the second optical source. During the period of switching to the second optical path and the period of switching from the second optical path to the first optical path, the light is actively turned off.
As a result, the lighting duty for the first and second light source means is shortened, so that a larger amount of current is supplied during the period when the optical path is truly switched, that is, the period during which the illumination light is emitted to the illumination area. A large amount of light can be obtained from the means. Therefore, it is possible to increase the luminance of the illumination area illuminated by the light source device of the present invention while maximizing the optical efficiency (while preventing a decrease in the optical efficiency).
In addition, as a light source means which shows such a characteristic, a light emitting diode (henceforth LED) can be illustrated.

  Note that the light emission periods of the first and second light sources do not have to be completely at the same timing as the switching (transition period) of the first and second optical paths, and may be turned off including at least the transition period. . In this case, there is a timing when both the first and second light sources are turned off during the transition period.

  Alternatively, when the switching between the first optical path and the second optical path is gradual, the boundary of the transition period becomes ambiguous, and the light emission period of the first or second light source is at the boundary of the transition period. It may be approached.

  In the above invention, the third light source means for emitting the illumination light, the optical path synthesis for combining the optical path of the illumination light emitted from the light selection means and the optical path of the illumination light emitted from the third light source means It is preferable that the control means controls the third light source means to emit light at least during the transition period.

  According to the present invention, the third light source means emits light at least during the transition period, that is, the period during which the first and second light source means do not emit light is all or one of the periods during which the third light source emits light. Therefore, the light source device can illuminate the illumination area so that there is substantially no transition period. In this way, the luminance of the illumination area is further increased and the optical efficiency of the light source device is prevented from being lowered.

  On the other hand, since the light emission of each light source means can be temporally separated, the illumination area can be illuminated without lowering the color purity even when the light source device of the present invention is applied to an application that requires color sequential illumination. . Specifically, since the light emitted from the first light source means, the second light source means, and the third light source means for emitting illumination lights of different colors can be temporally separated, the color purity is not lowered. The illumination area can be illuminated.

  In the above invention, it is desirable that the light selection means is a rotating wheel or a rotating mirror that transmits one of the illumination lights emitted from the first and second light source means and reflects the other.

  According to the present invention, the rotating wheel and the rotating mirror do not depend on the wavelength or the polarization as compared with the light selection means that depends on the wavelength or the polarization. Therefore, not only the light having the different property but also the light having the same property can be obtained. The optical path can be switched. Thereby, the lighting duty in each light source means becomes short, and a large current can be supplied to each light source means. As a result, the light source device of the present invention enables illumination with higher brightness than illumination using one light source means.

  The present invention selects the first selection light or the second selection light from the first light source means and the second light source means for emitting the illumination light, and at least the illumination light incident from the first light source means. And a light selection means for emitting light to the illumination area, an optical path combining means for combining the optical path of the illumination light emitted from the second light source means and the optical path of the first or second selection light, and the light selection. Control means for controlling the light emission and extinction of each of the first and second light source means according to the state of the means, the control means comprising the first converted light and the second converted light. And a light source device that turns off the first light source means and emits light from the second light source means within a transition period in which the first and second light source means are switched.

According to the present invention, the first light source means is turned off during the transition period in which the converted light is switched when a plurality of converted lights are emitted from one light source means (first light source means). Thereby, the lighting duty with respect to the first light source means is shortened, and it is possible to obtain a large amount of light from the first light source means by supplying more current during the period in which the converted light is emitted to the illumination area. Therefore, the brightness of the illumination area illuminated by the light source device of the present invention can be increased while preventing a decrease in optical efficiency.
Illumination light conversion includes wavelength conversion and polarization state conversion.

On the other hand, since the second light source unit emits light during the transition period, that is, the second light source emits light during the period when the first light source unit is turned off, the light source device has substantially no transition period. Thus, the illumination area can be illuminated. In this way, the luminance of the illumination area is further increased and the optical efficiency of the light source device is prevented from being lowered.
Furthermore, since the light emission of each light source means can be temporally separated, the illumination area can be illuminated without lowering the color purity even when the light source device of the present invention is applied to an application that requires color sequential illumination. .

  In the above-mentioned invention, it is desirable that the optical path synthesizing unit synthesizes the optical paths by using the wavelength or polarization of light.

According to the present invention, there is no transition period for synthesizing the optical path as compared with the optical path synthesizing means having a movable part. The brightness can be further increased.
Examples of optical path synthesis means for synthesizing optical paths using the wavelength of light include dichroic mirrors and dichroic prisms. Optical path synthesis means for synthesizing optical paths using polarization of light include PBS prisms ( Deflection beam splitter prism).

The present invention provides a projector including the light source device of the present invention.
According to the present invention, since the light source device of the present invention is provided, a projector that projects a bright projected image with high efficiency can be realized.

  According to the light source device and the projector of the present invention, the first and second light source means are actively turned off during the transition period in which the first optical path and the second optical path are switched, thereby preventing a decrease in optical efficiency. In addition, there is an effect of increasing the luminance of the illumination area.

[First Embodiment]
The light source device according to the first embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, the schematic diagram of the light source device which concerns on this embodiment is shown.
The light source device 1 illuminates the illumination area 41 as shown in FIG. The light source device 1 includes a first LED (first light source means) 11 and a second LED (second light source means) 12, a quick return mirror (light selection means, rotating mirror) 21, and a control unit. (Control means) 31 is provided.

  The first LED 11 and the second LED 12 emit illumination light that illuminates the illumination area 41. The illumination light emitted from the first LED 11 is guided to the illumination area 41 by the first optical path L1, and the illumination light emitted from the second LED 12 is guided to the illumination area 41 by the second optical path L2. (See FIG. 3).

The first and second LEDs 11 and 12 are arranged so that illumination light is emitted toward the rotation region of the quick return mirror 21. In this embodiment, the emission direction of the illumination light of the first LED 11 extends toward the illumination region 41, and the emission direction of the illumination light of the second LED 12 extends substantially perpendicular to the illumination region 41. LEDs 11 and 12 are arranged.
The first and second LEDs 11 and 12 are electrically connected to the control unit 31, and current and voltage for light emission are supplied from the control unit 31.

2 to 4 are schematic diagrams showing the respective phase states of the quick return mirror of FIG.
As shown in FIG. 1, the quick return mirror 21 selects one of the illumination lights emitted from the first and second LEDs 11 and 12 and guides it to the illumination area 41.
The quick return mirror 21 includes a rotating shaft 22 extending perpendicularly to the paper surface of FIG. 1, a reflecting plate 23 rotating around the rotating shaft 22, and a reflecting plate 23 based on a control signal from the control unit 31. And a drive unit (not shown) for rotationally driving.
A stepping motor can be used as the drive unit.

The rotation shaft 22 is disposed in the vicinity of the illumination region side end portion (right end portion in FIG. 1) of the reflection plate 23, and the first and second LED 11 and 12 side end portions of the reflection plate 23 from FIG. As shown in FIG. 4, it supports so that rotation is possible.
By supporting in this way, the reflecting plate 23 is substantially parallel to the emission direction of the illumination light of the first LED 11 or substantially perpendicular to the emission direction of the illumination light of the second LED 12 (0 (Refer to FIG. 1) and a phase of about 45 ° (see FIG. 3) with respect to the direction in which the first and second LEDs 11 and 12 emit the illumination light. It is supported by.

The reflecting plate 23 is rotated to form one of the first optical path L1 and the second optical path L2. In other words, the first and second optical paths L2 are switched.
The surface facing the second LED 12 in the reflection plate 23 is a mirror surface that reflects the illumination light. In the present embodiment, the first optical path L1 is formed when the phase of the reflecting plate 23 is 0 ° (see FIG. 1), and the second optical path L2 is formed when the phase of the reflecting plate 23 is 45 °. (FIG. 3).

As shown in FIG. 1, the control unit 31 controls the light emission and extinction of the first and second LEDs 11 and 12 and controls the rotation of the quick return mirror 21.
A specific control method will be described below.

Next, irradiation of illumination light to the illumination area 41 by the light source device 1 will be described.
FIG. 5 is a graph showing the displacement of the quick return mirror of FIG. 1 with time, and FIGS. 6 and 7 are graphs showing the current supplied to the first and second LEDs, respectively. FIG. 8 is a graph showing the brightness in the illumination area.

The vertical axis in FIGS. 6 and 7 normalizes the rated current when the first and second LEDs 11 and 12 are DC driven as 1, respectively, and the vertical axis in FIG. 8 indicates that the brightness during DC driving is 1 Normalized.
In FIG. 6 to FIG. 8, the current value and the brightness in this embodiment are indicated by solid lines. Further, as a comparison object, the case where the first and second LEDs 11 and 12 are DC driven is indicated by a broken line, and the case where the LEDs are alternately emitted at a duty of 1/2 (50%) is indicated by a two-dot chain line.

The quick return mirror 21 is rotated by repeating the following four states.
As shown in FIG. 1, the first state is a state s1 in which the first optical path L1 is formed and the emitted light of the first LED 11 is guided to the illumination area 41, and the phase of the reflector 23 at this time Is set to 0 °.
As shown in FIG. 2, the second state is a state s2 in which the state s1 transitions to a state s3 described later, and the phase of the reflector 23 at this time is a phase between 0 ° and 45 °. .
As shown in FIG. 3, the third state is a state s3 in which the second optical path L2 is formed and the emitted light of the second LED 12 is guided to the illumination region 41, and the phase of the reflector 23 at this time Is 45 °.
As shown in FIG. 4, the fourth state is a state s4 where the state s3 transitions to the above-described state s1, and the phase of the reflector 23 at this time is a phase between 0 ° and 45 °. .

  In the present embodiment, for one cycle T from the state s1 to the state s4, the period in which the state s1 and the state s3 are continued is 1 / 3T, and the period in which the state s2 and the state s4 are continued is 1 / 6T. The explanation will be made by applying to the case.

First, as shown in FIG. 1, the control unit 31 causes the first LED 11 to emit light when the quick return mirror 21 is in the state s1 (see FIGS. 5 and 6). Specifically, the first LED 11 is supplied with a current that is approximately three times the rated current described above.
When the quick return mirror 21 is in the state s1, the first optical path L1 is formed, and the illumination light emitted from the first LED 11 is guided to the illumination area 41 by the first optical path L1.
At this time, the second LED 12 is turned off (see FIG. 7).

  When the continuation period 1 / 3T of the state s1 elapses, the control unit 31 outputs a control signal for rotating the quick return mirror 21, and shifts to the state s2 as shown in FIG. At the same time, the control unit 31 turns off the first LED 11 (see FIGS. 5 and 6), and the first and second LEDs 11 and 12 are turned off (see FIGS. 6 and 7).

When the rotation of the quick return mirror 21 is completed and the state s3 as shown in FIG. 3 is reached, the control device 31 causes the second LED 12 to emit light (see FIGS. 5 and 7). Specifically, the second LED 12 is supplied with a current that is approximately three times the rated current described above.
The illumination light emitted from the second LED 12 is reflected by the quick return mirror 21 and guided to the illumination area 41. In other words, the light is guided to the illumination area 41 by the second optical path L2 formed by the quick return mirror 21.
At this time, the first LED 11 is turned off (see FIG. 6).

When the continuation period 1 / 3T of the state s3 elapses, the control unit 31 outputs a control signal for rotating the quick return mirror 21, and shifts to the state s4 as shown in FIG. At the same time, the control unit 31 turns off the second LED 12 (see FIGS. 5 and 7), and the first and second LEDs 11 and 12 are turned off (see FIGS. 6 and 7).
Thereafter, the state returns to the state s1, and the above-described control is repeated.

According to the above configuration, the first LED 11 is turned off not only during the period of the state s3 but also during the periods of the state s2 and s4, so that the duty is 1/3, and the input current is tripled compared to the constant current driving. Can be high.
Similarly, since the second LED 12 is turned off not only in the period of the state s1, but also in the periods of the state s2 and s4, the input current can be increased three times as compared with the constant current driving.

Further, in the period of the states s1 and s3, the luminance is hardly reduced due to optical loss, and the integrated brightness can be made brighter than that in which the light is alternately emitted by the duty ½.
Specifically, as shown in FIG. 8, the integrated brightness (area of the solid line) in the illumination area 41 is twice as bright as that of the one LED driven by constant current (area of the broken line). Thus, the brightness is 1.5 times as high as that obtained by alternately emitting two LEDs at a duty of 1/2 (area of the two-dot chain line).
Furthermore, the power consumption is 2/3 compared to the case where two LEDs emit light alternately with a duty of ½, making the light source device very efficient.

  To actively extinguish both the first LED 11 corresponding to the first optical path L1 and the second LED 12 corresponding to the second optical path L2 during the transition period (states s2, s4) in which the optical efficiency decreases. The lighting duty for the first and second LEDs 11 and 12 is shortened. Therefore, a large amount of current is supplied from the first and second LEDs 11 and 12 during a period when the optical path is truly switched (states s1 and s3), that is, a period when the illumination light is emitted to the illumination region 41. Can be obtained. As a result, it is possible to increase the luminance of the illumination area 41 illuminated by the light source device 1 of the present embodiment while maximizing the optical efficiency (while preventing a decrease in the optical efficiency).

  The light emission periods of the first and second LEDs 11 and 12 do not have to be completely the same timing as the switching (transition period) of the first and second optical paths L1 and L2, and are extinguished at least including the transition period. If you do. In this case, there is a timing when both the first and second LEDs 11 and 12 are turned off during the transition period.

  Alternatively, when the switching between the first optical path L1 and the second optical path L2 is gradual, the boundary of the transition period (states s2, s4) becomes ambiguous. The light emission period of the LED 11 or the second LED 12 may be approaching.

  Since the quick return mirror 21 does not depend on the wavelength or polarization as compared with the light selection means that depends on the wavelength or polarization, it can select not only light having different properties but also light having the same properties. The optical path can be switched. Thereby, the lighting duty in 1st and 2nd LED11, 12 becomes short, and a big electric current can be thrown into 1st and 2nd LED11,12. As a result, the light source device 1 of the present embodiment can perform illumination with higher brightness than illumination using one LED.

In the present embodiment, the quick return mirror 21 is provided as the light selection means. However, the light selection means is not limited to the quick return mirror 21, and other light selection means may be used and is not particularly limited.
For example, if a transition period occurs in selecting light, such as a rotating mirror, a prism group that controls total reflection and transmission at the prism interface, or sequential polarization conversion by a liquid crystal cell, the gist of the present invention is deviated. There is no.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the light source device of this embodiment is the same as that of the first embodiment, but is different from the first embodiment in that a third LED and a dichroic filter are provided. Therefore, in the present embodiment, the periphery of the third LED and the dichroic filter will be described with reference to FIGS. 9 to 17, and description of other components and the like will be omitted.
FIG. 9 is a schematic diagram of the light source device according to the present embodiment.
In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and the description is abbreviate | omitted.

  The light source device 2 illuminates the illumination area 41 as shown in FIG. The light source device 2 includes a first LED 11, a second LED 12, and a third LED (third light source means) 13, a quick return mirror 21, a dichroic filter (light combining means) 51, and a control unit (control means). ) 231.

  The third LED 13 emits illumination light that illuminates the illumination area 41, and emits illumination light having a wavelength different from that of the illumination light emitted from the first and second LEDs 11 and 12. . The illumination light emitted from the third LED 13 is guided to the illumination area 41 by the third optical path L3 (see FIG. 10).

  The third LED 13 is positioned at the side of the illumination area 41 with respect to the second LED 12 in a direction in which the emission direction of the illumination light of the third LED 13 extends substantially orthogonal to the emission direction of the illumination light of the first LED 11. Has been placed. Further, the third LED 13 is electrically connected to the control unit 231, and current and voltage for light emission are supplied from the control unit 231.

As shown in FIG. 9, the dichroic filter 51 transmits the illumination light guided to the first and second optical paths L1 and L2 extending toward the illumination region 41 and the illumination light emitted from the third LED 13. Is reflected toward the illumination area 41.
The dichroic filter 51 is approximately 45 ° with respect to the emission direction of the illumination light of the third LED 13 in a region where the emission direction of the illumination light of the first LED 11 and the emission direction of the illumination light of the third LED 13 intersect. It is tilted. Specifically, the dichroic filter 51 has an inclination that approaches the illumination area 41 in the direction in which the third LED 13 emits illumination light.

As shown in FIG. 9, the control unit 231 controls the light emission and extinction of the first to third LEDs 11, 12, and 13 and controls the rotation of the quick return mirror 21.
A specific control method will be described below.

Next, irradiation of illumination light to the illumination area 41 by the light source device 2 described above will be described.
10 to 12 are schematic diagrams showing the respective phase states of the quick return mirror of FIG.
As in the first embodiment, the quick return mirror 21 rotates in a state s1 (see FIG. 9) that forms the first optical path L1 and guides the emitted light from the first LED 11 to the illumination area 41. The state s1 is changed to the state 3 to be described later, and the state s2 (see FIG. 10) in which the emitted light of the third LED 13 is guided to the illumination area 41 by the third optical path L3, and the second optical path L2. And a state s3 (see FIG. 11) for guiding the emitted light of the second LED 12 to the illumination area 41, and a state in which the state s3 transitions to the state 1 described above, and the third light path L3 causes the third state This is performed by repeating the state s4 (see FIG. 12) in which the emitted light of the LED 13 is guided to the illumination area 41.

  FIG. 13 is a graph showing the displacement of the quick return mirror of FIG. 1 with time, and FIGS. 14 to 16 are graphs showing the currents supplied to the first, second and third LEDs, respectively. FIG. 17 is a graph showing the brightness in the illumination area.

The vertical axis in FIGS. 14 to 16 is normalized with the rated current when the first, second and third LEDs 11, 12, 13 are DC driven as 1, respectively, and the vertical axis in FIG. The brightness is normalized as 1.
In FIG. 14 to FIG. 17, the current value and brightness in the present embodiment are displayed by solid lines. Furthermore, as a comparison object, the case where the first, second and third LEDs 11, 12, 13 are DC driven is indicated by broken lines.

  First, as shown in FIG. 9, the controller 231 causes the first LED 11 to emit light when the quick return mirror 21 is in the state s1 (see FIGS. 13 and 14). Specifically, the first LED 11 is supplied with a current that is approximately three times the rated current described above.

When the quick return mirror 21 is in the state s1, the first optical path L1 is formed. The illumination light emitted from the first LED 11 is guided to the illumination area 41 by the first optical path L1. In other words, the light passes through the dichroic filter 51 and is guided to the illumination area 41.
At this time, the second and third LEDs 12 are turned off (see FIGS. 15 and 16).

  When the continuation period 1 / 3T of the state s1 elapses, the control unit 231 outputs a control signal for rotating the quick return mirror 21, and shifts to the state s2 as shown in FIG. At the same time, the control unit 231 turns off the first LED 11 (see FIGS. 13 and 14) and causes the third LED 13 to emit light (see FIG. 16).

The illumination light emitted from the third LED 13 is reflected by the dichroic filter 51 and guided to the illumination area 41. In other words, the light is guided to the illumination area 41 by the third optical path L3.
At this time, the first and second LEDs 11 and 12 are turned off (see FIGS. 14 and 15).

  When the rotation of the quick return mirror 21 is finished and the state s3 as shown in FIG. 11 is reached, the control device 231 causes the second LED 12 to emit light (see FIGS. 13 and 15). Specifically, the second LED 12 is supplied with a current that is approximately three times the rated current described above.

The illumination light emitted from the second LED 12 is reflected by the quick return mirror 21, then passes through the dichroic filter 51 and is guided to the illumination area 41. In other words, the light is guided to the illumination area 41 by the second optical path L2 formed by the quick return mirror 21.
At this time, the first and third LEDs 11 and 13 are turned off (see FIGS. 14 and 16).

  When the continuation period 1 / 3T of the state s3 elapses, the control unit 231 outputs a control signal for rotating the quick return mirror 21, and shifts to the state s4 as illustrated in FIG. At the same time, the control unit 231 turns off the second LED 12 (see FIGS. 13 and 15) and causes the third LED 13 to emit light (see FIG. 16).

The illumination light emitted from the third LED 13 is reflected by the dichroic filter 51 and guided to the illumination area 41. In other words, the light is guided to the illumination area 41 by the third optical path L3.
As described above, the third LED 13 emits illumination light twice with a duty of 1/6 during one cycle (period T). Therefore, the duty becomes substantially 1/3, and the third LED 13 is supplied with a current three times that of the DC drive.

At this time, the first and second LEDs 11 and 12 are turned off (see FIGS. 14 and 15).
Thereafter, the state returns to the state s1, and the above-described control is repeated.

  As described above, in the first embodiment, in the transition period (state s2, s4) in which the illumination area 41 is not illuminated, the third LED 13 emits light so that the illumination area 41 is not illuminated. The period is complemented. Therefore, in the light source device 2 of this embodiment, the brightness of the illumination area 41 can be further increased from that of the first embodiment.

  According to the above configuration, the third LED 13 emits light during the transition period (states s2, s4), that is, the third LED 13 emits light during the period when the first and second LEDs 11 and 12 are not emitting light. Therefore, the light source device 2 can illuminate the illumination area 41 so that there is substantially no transition period. In this way, the luminance of the illumination area 41 is further increased and the optical efficiency in the light source device 2 is prevented from being lowered.

  Note that the period during which the third LED 13 emits light may include the transition period (states s2, s4), and may be longer than the transition period (states s2, s4), and is not particularly limited.

  On the other hand, since the light emission of the first, second, and third LEDs 11, 12, and 13 can be temporally separated, even if the light source device 2 of this embodiment is applied to an application that requires color sequential illumination, the color purity The illumination area 41 can be illuminated without lowering. Specifically, since the emission of the first LED 11, the second LED 12, and the third LED 13 that emit illumination light of different colors can be temporally separated, the illumination region 41 does not deteriorate color purity. Can be illuminated.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the light source device of this embodiment is the same as that of the first embodiment, but is different from the first embodiment in that it is configured to emit illumination light of a different color. Therefore, in the present embodiment, only the periphery of the configuration that emits illumination light of different colors will be described with reference to FIGS.
FIG. 18 is a schematic diagram of the light source device according to the present embodiment.
In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and the description is abbreviate | omitted.

  The light source device 3 illuminates the illumination area 41 as shown in FIG. The light source device 3 includes a first LED (first light source means) 11G and a second LED (second light source means) 12G that emit green illumination light, and a third LED that emits red illumination light. The LED (first light source means) 13R and the fourth LED (second light source means) 14R, and the fifth LED (first light source means) 15B and the sixth LED (first light source) emitting blue illumination light. 2 light source means) 16B, a first quick return mirror (light selecting means, rotating mirror) 21G that reflects green, red, and blue illumination lights, respectively, and a second quick return mirror (light selecting means, rotating) A mirror 21R, a third quick return mirror (light selection means, rotating mirror) 21B, a control unit (control means) 331, and a dichroic prism (light combining means) 351 are provided.

  The first LED 11 </ b> G and the second LED 12 </ b> G emit green illumination light that illuminates the illumination area 41. The illumination light emitted from the first LED 11G passes through the dichroic prism 351 and is guided to the illumination area 41, and the illumination light emitted from the second LED 12G is reflected by the first quick return mirror 21G. The light passes through the dichroic prism 351 and is guided to the illumination area 41 (see FIG. 18).

  The first and second LEDs 11G and 12G are arranged so that illumination light is emitted toward the rotation region of the first quick return mirror 21G. In this embodiment, the emission direction of the illumination light of the first LED 11G extends toward the illumination area 41, and the emission direction of the illumination light of the second LED 12G extends substantially orthogonally to the first and second LEDs 11G. LEDs 11G and 12G are arranged.

  The third LED 13R and the fourth LED 14R emit red illumination light that illuminates the illumination region 41. The illumination light emitted from the third LED 13R is guided to the illumination area 41 by being reflected by the dichroic prism 351, and the illumination light emitted from the fourth LED 14R is reflected by the second quick return mirror 21R. After that, the light is reflected by the dichroic prism 351 and guided to the illumination area 41 (see FIG. 18).

  The third and fourth LEDs 13R and 14R are arranged so that illumination light is emitted toward the rotation region of the second quick return mirror 21R. In the present embodiment, the third and fourth illumination light emission directions of the third LED 13R extend toward the dichroic prism 351, and the illumination light emission direction of the fourth LED 14R extends substantially orthogonal to the third LED 13R. LEDs 13R and 14R are arranged.

  The fifth LED 15 </ b> B and the sixth LED 16 </ b> B emit blue illumination light that illuminates the illumination region 41. The illumination light emitted from the fifth LED 15B is guided to the illumination area 41 by being reflected by the dichroic prism 351, and the illumination light emitted from the sixth LED 16B is reflected by the third quick return mirror 21B. After that, the light is reflected by the dichroic prism 351 and guided to the illumination area 41 (see FIG. 18).

  The fifth and sixth LEDs 15B and 16B are arranged so that illumination light is emitted toward the rotation region of the third quick return mirror 21B. In the present embodiment, the fifth and sixth LED 15B emit the illumination light in the emission direction extending toward the dichroic prism 351, and extend substantially perpendicular to the sixth LED 16B in the illumination light emission direction. LEDs 15B and 16B are arranged.

  The first to sixth LEDs 11G, 12G, 13R, 14R, 15B, and 16B are electrically connected to the control unit 331, and current and voltage for light emission are supplied from the control unit 331.

As shown in FIG. 18, the first quick return mirror 21 </ b> G selects one of the illumination lights emitted from the first and second LEDs 11 </ b> G and 12 </ b> G and guides it to the illumination area 41.
The first quick return mirror 21G has a phase (indicated as 0 °) that is substantially parallel to the emission direction of the illumination light of the first LED 11G or substantially orthogonal to the emission direction of the illumination light of the second LED 12G. .) (See FIG. 18) and a phase of about 45 ° (see FIG. 18) with respect to the emission direction of the illumination light of the first and second LEDs 11G and 12G. Yes.

As shown in FIG. 18, the first quick return mirror 21 </ b> G selects one of the illumination lights emitted from the first and second LEDs 11 </ b> G and 12 </ b> G and guides it to the illumination area 41.
The second quick return mirror 21R is substantially parallel to the emission direction of the illumination light of the third LED 13R or a phase (0 °) that is substantially orthogonal to the emission direction of the illumination light of the fourth LED 14R. .) (See FIG. 18) and a phase of about 45 ° (see FIG. 18) with respect to the emission direction of the illumination light of the third and fourth LEDs 13R and 14R. Yes.

As shown in FIG. 18, the third quick return mirror 21 </ b> B selects one of the illumination lights emitted from the fifth and sixth LEDs 15 </ b> B and 16 </ b> B and guides it to the illumination area 41.
The third quick return mirror 21B has a phase (indicated as 0 °) substantially parallel to the illumination direction of the fifth LED 15B or substantially orthogonal to the illumination direction of the sixth LED 16B. .) (See FIG. 18) and a phase of about 45 ° (see FIG. 18) with respect to the emission direction of the illumination light of the fifth and sixth LEDs 15B and 16B. Yes.

The dichroic prism 351 transmits green illumination light and reflects red and blue illumination light toward the illumination area 41.
The dichroic prism 351 is disposed in a region where the illumination light emitted from the first LED 11G, the illumination light emitted from the third LED 13R, and the illumination light emitted from the fifth LED 15B intersect. Further, the dichroic prism 351 reflects the red illumination light emitted from the third and fourth LEDs 13R and 14R and transmits one illumination surface having other wavelengths, and the fifth and sixth reflection surfaces. In addition to reflecting the blue illumination light emitted from the LEDs 15B and 16B, other reflective surfaces that transmit illumination light of other wavelengths are provided.

As shown in FIG. 18, the control unit 331 controls light emission and extinction in the first to sixth LEDs 11G, 12G, 13R, 14R, 15B, and 16B, and the first to third quick return mirrors 21G and 21R. , 21B is controlled.
A specific control method will be described below.

Next, irradiation of illumination light to the illumination area 41 by the light source device 3 described above will be described.
19 to 21 are graphs showing displacements of the first to third quick return mirrors with time. 22 and 23 are graphs showing currents supplied to the first and second LEDs, respectively. 24 and 25 are graphs showing currents supplied to the third and fourth LEDs, respectively. 26 and 27 are graphs showing currents supplied to the fifth and sixth LEDs, respectively. FIG. 28 is a graph showing the brightness in the illumination area.

The vertical axis in FIGS. 22 to 27 is normalized with the rated current when the first to sixth LEDs 11G, 12G, 13R, 14R, 15B, and 16B are DC driven as 1, and the vertical axis in FIG. The brightness at the time of driving is normalized as 1.
In FIG. 22 to FIG. 28, the current value and the brightness in this embodiment are indicated by solid lines. Furthermore, as a comparison object, the case where the first to sixth LEDs 11G, 12G, 13R, 14R, 15B, and 16B are DC-driven is indicated by broken lines.

The rotation in the first quick return mirror 21G is performed by repeating the following four states.
As shown in FIGS. 18 and 19, the first state is a state s1G that guides the emitted light from the first LED 11G to the illumination area 41, and the second state is from the state s1G to a state s3G described later. This is a transition state s2G.
As shown in FIG. 18, the third state is a state s3G that guides the emitted light of the second LED 12G to the illumination area 41, and the fourth state is a state that transitions from the state s3G to the state s1G described above. s4G.

The rotation in the second quick return mirror 21R is performed by repeating the following four states.
As shown in FIGS. 18 and 20, the first state is a state s1R that guides the emitted light of the third LED 13R to the illumination area 41, and the second state is from a state s1R to a state s3R described later. This is the transition state s2R.
As shown in FIG. 18, the third state is a state s3R that guides the emitted light of the fourth LED 14R to the illumination area 41, and the fourth state is a state in which the state s3R transitions to the state s1R described above. s4R.

The rotation in the third quick return mirror 21B is performed by repeating the following four states.
As shown in FIGS. 18 and 21, the first state is a state s1B that guides the emitted light of the fifth LED 15B to the illumination area 41, and the second state is from the state s1B to a state s3B described later. This is a transition state s2B.
As shown in FIGS. 18 and 21, the third state is a state s3B that guides the emitted light of the sixth LED 16B to the illumination region 41, and the fourth state is from the state s3B to the state s1B described above. This is a transition state s4B.

In the present embodiment, the period in which the states s1G and s3G are continued is 1 / 3T with respect to one cycle T from the state s1G to the state s4G in the first quick return mirror 21G, and the states s2G and s4G are continued. The description will be made by applying to the case where the period to be set is 1 / 6T.
The same applies to the second and third quick return mirrors 21R and 21B.

  Further, the rotation timings of the first, second and third quick return mirrors 21G, 21R and 21B are as shown in FIGS. 19 to 21 from the first quick return mirror 21G to the third quick return mirror. In the order of 21B, the period is delayed by 1 / 6T.

First, as shown in FIG. 18, the control unit 331 causes the first LED 11G to emit light when the first quick return mirror 21G is in the second half of the state s1G (see FIGS. 19 and 22). Specifically, a current that is approximately six times the rated current described above is supplied to the first LED 11G.
The green illumination light emitted from the first LED 11G passes through the dichroic prism 351 and is guided to the illumination area 41.
At this time, the second to sixth LEDs 12G, 13R, 14R, 15B, and 16B are turned off (see FIGS. 23 to 27).

  When the duration of the state s1G elapses, the control unit 331 turns off the first LED 11G (see FIG. 22), outputs a control signal for rotating the first quick return mirror 21G, and outputs the first quick return mirror 21G. The return mirror 21G moves to the state s2G (see FIG. 19).

At the same time, the control unit 331 causes the third LED 13R to emit light when the second quick return mirror 21R is in the second half of the state s1R (see FIGS. 20 and 24). The red illumination light emitted from the third LED 13R is reflected by the dichroic prism 351 and guided to the illumination area 41.
At this time, the first, second, and fourth to sixth LEDs 11G, 12G, 14R, 15B, and 16B are turned off (see FIGS. 22 and 23, and FIGS. 25 to 27).

  When the duration of the state s1R elapses, the control unit 331 turns off the third LED 13R (see FIG. 24), outputs a control signal for rotating the second quick return mirror 21R, and outputs the second quick return mirror 21R. The return mirror 21R shifts to the state s2R (see FIG. 20).

At the same time, the control unit 331 causes the fifth LED 15B to emit light when the third quick return mirror 21B is in the second half of the state s1B (see FIGS. 21 and 26). The blue illumination light emitted from the fifth LED 15 </ b> B is reflected by the dichroic prism 351 and guided to the illumination area 41.
At this time, the first to fourth and sixth LEDs 11G, 12G, 13R, 14R, and 16B are turned off (see FIGS. 22 to 26 and 27).

  When the duration of the state s1B elapses, the control unit 331 turns off the fifth LED 15B (see FIG. 26), outputs a control signal for rotating the third quick return mirror 21B, and outputs the third quick return mirror 21B. The return mirror 21B moves to the state s2B (see FIG. 21).

At the same time, the control unit 331 causes the second LED 12G to emit light when the first quick return mirror 21G is in the second half of the state s3G (see FIGS. 19 and 23). The green illumination light emitted from the second LED 12G is reflected by the first quick return mirror 21G, then passes through the dichroic prism 351 and is guided to the illumination area 41.
At this time, the first, third to sixth LEDs 11G, 13R, 14R, 15B, and 16B are turned off (see FIGS. 22 and 24 to 27).

  When the duration of the state s3G elapses, the control unit 331 turns off the second LED 12G (see FIG. 23), outputs a control signal for rotating the first quick return mirror 21G, and outputs the first quick return mirror 21G. The return mirror 21G moves to the state s4G (see FIG. 19).

At the same time, the control unit 331 causes the fourth LED 14R to emit light when the second quick return mirror 21R is in the second half of the state s3R (see FIGS. 20 and 25).
The red illumination light emitted from the fourth LED 14R is reflected by the second quick return mirror 21R and the dichroic prism 351 and guided to the illumination area 41.
At this time, the first to third, fifth, and sixth LEDs 11G, 12G, 13R, 15B, and 16B are turned off (see FIGS. 22 to 24, 26, and 27).

  When the duration of the state s3R elapses, the control unit 331 turns off the fourth LED 14R (see FIG. 25), outputs a control signal for rotating the second quick return mirror 21R, and outputs the second quick return mirror 21R. The return mirror 21R shifts to the state s4R (see FIG. 20).

At the same time, the control unit 331 causes the sixth LED 16B to emit light when the third quick return mirror 21B is in the second half of the state s3B (see FIGS. 21 and 27).
The blue illumination light emitted from the sixth LED 16B is reflected by the third quick return mirror 21B and the dichroic prism 351 and guided to the illumination area 41.
At this time, the first to fifth LEDs 11G, 12G, 13R, 14R, and 15B are turned off (see FIGS. 22 to 26).

  According to said structure, compared with the case where each color illumination light is radiate | emitted from one LED, respectively, the period when each LED radiates | emits illumination light is radiated | emitted from each two LED. Can be shortened. Therefore, each LED 11G, 12G, 13R, 14R, 15B, 16B can be driven with a large current, and a large amount of illumination light can be emitted.

Since the transition periods of the quick return mirrors 21G, 21R, and 21B are shifted from each other, a large amount of illumination light emitted from the LEDs 11G, 12G, 13R, 14R, 15B, and 16B is continuously emitted to the illumination area 41. be able to. Therefore, the illumination area 41 is always efficiently irradiated with a large amount of illumination light.
Furthermore, even when performing color sequential illumination in which illumination is performed with illumination lights of different colors in time order, the illumination area 41 can be illuminated without reducing color purity.

  In the second and third embodiments, the light synthesizer has been described as applied to the light source devices 2 and 3 including the dichroic filter 51 and the dichroic prism 351, respectively. It is not limited.

For example, it is possible to use other dynamically changing synthesizing means such as a PBS prism for synthesizing by polarization of light, or even a light synthesizing means for synthesizing light (optical path) by a movable mechanism. As long as the transition period is shorter than that of the light selection means such as the above, it can be used without departing from the gist of the present invention.
When the above-described PBS prism is used as a light combining means, a polarizing plate, a half-phase plate or the like may be used as appropriate in order to align the polarization state.

In the present embodiment, the description is applied to the light source device 3 provided with the first to third quick return mirrors 21G, 21R, and 21B corresponding to the green, red, and blue illumination lights. Only light may be configured to include the first and second LEDs 11G and 12G and the first quick return mirror 21G, and the red and blue illumination light may be configured to emit each illumination light from one LED. .
In the case of this configuration, control may be performed to emit red and blue illumination light and continuously emit green, red and blue illumination light within the transition period of the first quick return mirror 21G. .

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the light source device of this embodiment is the same as that of the first embodiment, but is different from the first embodiment in that it is configured to emit illumination light of a different color. Therefore, in the present embodiment, only the periphery of the configuration that emits illumination light of different colors will be described with reference to FIGS.
FIG. 29 is a schematic diagram of a light source device according to the present embodiment.
In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and the description is abbreviate | omitted.

  The light source device 4 illuminates the illumination area 41 as shown in FIG. The light source device 4 includes a white LED (first light source means) 17W and a red LED (second light source means) 18R, a color wheel (light selection means) 424, a color filter (light combining means) 451, and a control unit. (Control means) 431 is provided.

  As shown in FIG. 29, the white LED 17 </ b> W emits illumination light that illuminates the illumination region 41, and emits light whose red emission spectrum is poor compared to the emission spectrum from blue to yellow. is there. The illumination light emitted from the white LED 17W is guided to the color wheel 424, and the illumination light transmitted through the color wheel 424 is guided to the illumination area 41 through the color filter 451.

  The white LED 17 </ b> W is arranged so that the emission direction of the illumination light extends toward the illumination area 41. Further, the white LED 17 </ b> W is electrically connected to the control unit 431, and current and voltage for light emission are supplied from the control unit 431.

  As shown in FIG. 29, the red LED 18R emits red illumination light that illuminates the illumination area 41. The illumination light emitted from the red LED 18R is guided to the illumination area 41 by being reflected by the color filter 451.

  The red LED 18R is disposed at a position on the illumination area 41 side with respect to the white LED 17W in a direction extending substantially perpendicular to the emission direction of the illumination light of the white LED 17W and extending the emission direction of the illumination light of the red LED 18R. Further, the red LED 18R is electrically connected to the control unit 431, and current and voltage for light emission are supplied from the control unit 431.

FIG. 30 is a schematic diagram illustrating the configuration of the color wheel of FIG.
As shown in FIGS. 29 and 30, the color wheel 424 is a disk-shaped member that is rotatably supported around a rotation shaft 424C provided at the center and is rotationally controlled by the control unit 431. is there. A known driving device such as a stepping motor can be used for rotating the color wheel 424 based on the control signal of the control unit 431, and is not particularly limited.
As shown in FIG. 30, the color wheel 424 has a green light transmission region 424G that transmits green illumination light (first selection light) and blue light transmission that transmits blue illumination light (second selection light). A region 424B is provided in a semicircular shape.

The color wheel 424 is disposed between the white LED 17 </ b> W and the color filter 451 at a position where the illumination light emitted from the white LED 17 </ b> W is irradiated on the disk surface of the color wheel 424. In the present embodiment, the description is applied to a configuration in which the axis of the rotating shaft 424C is disposed substantially parallel to the emission direction of the white LED 17W, but the present invention is not limited to this configuration.
In addition, the irradiation area | region A shown by the broken-line circle | round | yen in FIG. 30 shows the area | region where the white illumination light radiate | emitted from white LED17W is irradiated.

  The color filter 451 is a plate-like member that transmits the green and blue illumination light transmitted through the color wheel 424 and reflects the red illumination light emitted from the red LED 18R.

  The color filter 451 is disposed between the color wheel 424 and the illumination area 41 and in an area where the emission direction of the illumination light of the white LED 17W and the emission direction of the illumination light of the red LED 18R intersect. Further, the surface of the color filter 451 on which the red illumination light is incident is disposed so as to have an inclination approaching the illumination area 41 in the emission direction of the red LED 18R. In the present embodiment, the description will be made by applying this inclination to a configuration of about 45 ° with respect to the emission direction of the red LED 18R.

As shown in FIG. 29, the control unit 431 controls the light emission and extinction of the white and red LEDs 17W and 18R and the rotation of the color wheel 424.
A specific control method will be described below.

Next, irradiation of illumination light to the illumination area 41 by the light source device 4 will be described.
FIG. 31 is a graph showing the ratio of the green light and blue light transmission regions in the illumination region of the color wheel of FIG. 30, and FIGS. 32 and 33 are graphs showing the currents supplied to the white and red LEDs, respectively. . FIG. 34 is a graph showing the brightness in the illumination area.

In FIG. 31, the ratio of the green light transmission area 424G to the illumination area irradiated with white illumination light in the color wheel 424 is indicated by a solid line, and the ratio of the blue light transmission area 424B is indicated by a broken line.
The vertical axes in FIGS. 32 and 33 are normalized with the rated current when the white and red LEDs 17W and 18R are DC driven as 1, respectively, and the vertical axis in FIG. 34 is normalized with the brightness during DC driving as 1. Yes.

The rotation in the color wheel 424 is performed by repeating the following four states.
As shown in FIG. 31, the first state is a state q1 in which the irradiation region A is included in the green light transmission region 424G, and the ratio of the green light transmission region 424G in the irradiation region A is one. At this time, white illumination light emitted from the white LED 17W passes through the green light transmission region 424G and is converted into green illumination light.

  As shown in FIG. 2, the second state is a state q2 that makes a transition from the state q1 to a state q3 described later. At this time, the illumination area A includes both the green light transmission area 424G and the blue light transmission area 424B.

  The third state is a state q3 in which the irradiation region A is included in the blue light transmission region 424B, and the ratio of the blue light transmission region 424B in the irradiation region A is one. At this time, white illumination light emitted from the white LED 17W passes through the blue light transmission region 424B and is converted into blue illumination light.

  The fourth state is the state q4 that makes a transition from the state q3 to the state q1 described above. At this time, the illumination area A includes both the green light transmission area 424G and the blue light transmission area 424B.

First, as shown in FIG. 29, the control unit 431 causes the white LED 17W to emit light when the color wheel 424 is in the state q1 (see FIGS. 31 and 32). Specifically, the above-mentioned rated current is supplied to the white LED 17W.
When the color wheel 424 is in the state q1, the illumination light emitted from the white LED 17W enters the green light transmission region 424G via the first optical path L41, and only the green illumination light is transmitted. The transmitted green illumination light passes through the color filter 451 and is guided to the illumination area 41.
At this time, the red LED 18R is turned off (see FIG. 33).

When the color wheel 424 rotates and enters the state q2 where the illumination area A starts to include the blue light transmission area 424B, the control unit 431 turns off the white LED 17W (see FIG. 32) and causes the red LED 18R to emit light (see FIG. 33.). Specifically, the red LED 18R is supplied with a current approximately three times the rated current described above.
The illumination light emitted from the red LED 18R is reflected by the color filter 451 through the second optical path L42 and guided to the illumination area 41.

When the illumination region A becomes the state q3 in which all the illumination regions A become the blue light transmission region 424B, the control unit 431 turns off the red LED 18R (see FIG. 33) and causes the white LED 17W to emit light (see FIG. 32).
When the color wheel 424 is in the state q3, the illumination light emitted from the white LED 17W enters the blue light transmission region 424B, and only the blue illumination light is transmitted. The transmitted blue illumination light passes through the color filter 451 and is guided to the illumination area 41.

When the state q4 starts to include the green light transmission region 424G in the illumination region A, the control unit 431 turns off the white LED 17W (see FIG. 32) and causes the red LED 18R to emit light (see FIG. 33).
The illumination light emitted from the red LED 18R is reflected by the color filter 451 and guided to the illumination area 41.
Thereafter, the state returns to the state s1, and the above-described control is repeated.

  According to said structure, white LED 17W is light-extinguished in the transition period (state q2 and state q4) in which each illumination light switches in the case of emitting green and blue illumination light from white LED 17W and the color wheel 424. As a result, the lighting duty for the white LED 17W is shortened, and in the period (state q1 and state q3) in which green and blue illumination light is emitted to the illumination area 41, a larger amount of current is input to obtain a large amount of light from the white LED 17W. be able to. Therefore, it is possible to increase the luminance of the illumination area 41 illuminated by the light source device 4 of the present embodiment while preventing a decrease in optical efficiency.

On the other hand, since the red LED 18R emits light during the transition period (state q2 and state q4), that is, the red LED 18R emits light during the period when the white LED 17W is off, the light source device 4 has substantially no transition period. Thus, the illumination area 41 can be illuminated. By doing in this way, the brightness | luminance of the illumination area | region 41 can be made brighter, and the fall of the optical efficiency in the light source device 4 can be prevented.
Furthermore, since the light emission of the white and red LEDs 17W and 18R can be temporally separated, even if the light source device 4 of the present embodiment is applied to an application that requires color sequential illumination, the illumination region 41 does not deteriorate color purity. Can be illuminated.

  Since the color filter 451 has no transition period for synthesizing the optical path as compared with the optical path synthesizing unit having a movable part, the optical filter in the light source device 4 of the present embodiment can be more reliably prevented from being deteriorated and the illumination region 41 can further increase the luminance.

In addition, when illuminating the illumination region 41 with the white illumination light emitted from the white LED 17W, the red wavelength region is insufficient in the above-described white illumination light, and the red LED 18R that emits the red illumination light is used to compensate for this. May be used.
In such a case, by emitting red illumination light from the red LED 18R between the state q2 and the state q4, illumination without the extinguishing period (state q2 and state q4) is possible as in the first embodiment.

In the above-described embodiment, the light selection unit is described as applied to a configuration using the color wheel 424 that transmits light of two wavelengths of green and blue. However, the light selection unit is emitted from one light source. The present invention does not depart from the present invention as long as it obtains outgoing light having a plurality of characteristics based on the outgoing light and generates a transition period that is a period for switching each characteristic.
For example, a configuration using a color wheel that transmits light of multi-primary colors, a color filter mechanically switching unit, a sequential polarization conversion unit using a liquid crystal cell, or the like may be used.

[Fifth Embodiment]
Next, a projector according to a fifth embodiment of the invention will be described with reference to FIG.
The projector according to this embodiment is provided with the light source device 3 according to the above-described third embodiment. Therefore, in this embodiment, description of the light source device 3 is omitted, and components other than the light source device 3 will be described.
FIG. 35 is a schematic diagram illustrating the configuration of the projector according to the present embodiment.

As shown in FIG. 35, the projector 5 projects an image on a screen 65 using the illumination light emitted from the light source device 3.
As shown in FIG. 35, the projector 5 is provided with a light source device 3, a modulation device 62, a relay lens 63, and a projection lens 64.

  The light source device 3 is a color sequential light source that sequentially emits green, red, and blue illumination light as described above. The light source device 3 is arranged in a direction in which each illumination light is emitted toward the modulation device 62.

  The modulation device 62 modulates each illumination light incident from the light source device 3 based on an image to be displayed, and emits the modulated light for displaying an image. In the present embodiment, the modulation device 62 will be described as applied to DMD (Digital Micromirror Device (registered trademark)).

  The relay lens 63 guides and collects each illumination light emitted from the light source device 3 to the modulation device 62. The relay lens 63 is disposed between the light source device 3 and the modulation device 62.

  The projection lens 64 emits the modulated light of each color emitted from the modulation device 62 toward the screen 65. The projection lens 64 is disposed between the modulation device 62 and the screen 65.

  According to the above configuration, since the illumination light of each color emitted from the light source device 3 is used, the projector 5 according to the present embodiment improves the brightness of the display area and the projected image with high color purity on the screen 65. Can be projected.

The schematic diagram of the light source device which concerns on the 1st Embodiment of this invention is shown. It is the schematic diagram which showed each phase state of the quick return mirror of FIG. It is the schematic diagram which showed each phase state of the quick return mirror of FIG. It is the schematic diagram which showed each phase state of the quick return mirror of FIG. It is a graph which shows the displacement by the time of the quick return mirror of FIG. It is a graph which shows the electric current supplied to 1st LED of FIG. It is a graph which shows the electric current supplied to 2nd LED of FIG. It is a graph which shows the brightness in the illumination area | region of FIG. It is a schematic diagram of the light source device which concerns on the 2nd Embodiment of this invention. It is the schematic diagram which showed each phase state of the quick return mirror of FIG. It is the schematic diagram which showed each phase state of the quick return mirror of FIG. It is the schematic diagram which showed each phase state of the quick return mirror of FIG. It is a graph which shows the displacement by the time of the quick return mirror of FIG. 10 is a graph showing a current supplied to the first LED of FIG. 9. 10 is a graph showing a current supplied to the second LED of FIG. 9. 10 is a graph showing a current supplied to the third LED in FIG. 9. It is a graph which shows the brightness in the illumination area | region of FIG. It is a schematic diagram of the light source device which concerns on the 3rd Embodiment of this invention. It is a graph which shows the displacement by the time of the 1st quick return mirror of FIG. It is a graph which shows the displacement by the time of the 2nd quick return mirror of FIG. It is a graph which shows the displacement by the time of the 3rd quick return mirror of FIG. It is a graph which shows the electric current supplied to 1st LED of FIG. It is a graph which shows the electric current supplied to 2nd LED of FIG. It is a graph which shows the electric current supplied to 3rd LED of FIG. It is a graph which shows the electric current supplied to 4th LED of FIG. It is a graph which shows the electric current supplied to 5th LED of FIG. It is a graph which shows the electric current supplied to 6th LED of FIG. It is a graph which shows the brightness in the illumination area | region of FIG. It is a schematic diagram of the light source device which concerns on the 4th Embodiment of this invention. It is a schematic diagram explaining the structure of the color wheel of FIG. It is a graph which shows the ratio for which the green light and blue light transmission area | region occupies in the illumination area | region of the color wheel of FIG. It is a graph which shows the electric current supplied to white LED of FIG. It is a graph which shows the electric current supplied to red LED of FIG. It is a graph which shows the brightness in an illumination area | region. It is a schematic diagram explaining the structure of the projector which concerns on the 5th Embodiment of this invention. It is a figure explaining the schematic structure of the whole conventional optical path switching apparatus. It is a figure explaining each transition state of the rotary body of FIG. It is a figure explaining each transition state of the rotary body of FIG. It is a figure explaining each transition state of the rotary body of FIG. It is a figure explaining each transition state of the rotary body of FIG. It is a graph which shows the displacement of the rotary body of FIG. It is a graph which shows the electric current supplied to each light source of FIG. It is a graph which shows the electric current supplied to each light source of FIG. It is a graph which shows the brightness in the illumination area | region of FIG.

Explanation of symbols

1, 2, 3, 4 Light source device 5 Projector 11, 11G First LED (first light source means)
12, 12G second LED (second light source means)
13 3rd LED (3rd light source means)
21, 21R, 21G, 21B Quick return mirror (light selection means, rotating mirror)
31, 231, 331 Control unit (control means)
51 Dichroic filter (photosynthesis means)
13R third LED (first light source means)
14R Fourth LED (second light source means)
15B Fifth LED (first light source means)
16B 6th LED (2nd light source means)
17W white LED (first light source means)
18R red LED (second light source means)
351,451 Dichroic prism (photosynthesis means)
424 color wheel (light selection means)
451 Color filter (Photosynthesis means)
L1, L41 1st optical path L2, L42 2nd optical path

Claims (6)

  1. First light source means and second light source means for emitting illumination light;
    The illumination light emitted from one of the first and second light source means is selected, and a first optical path or a second optical path for guiding the selected illumination light is formed, and the first and second optical paths are formed. Light selection means for emitting illumination light guided by one of the two optical paths to the illumination area;
    Control means for controlling light emission and extinction of each of the first and second light source means according to the formation of the first or second optical path by the light selection means,
    The control means includes
    At least in the transition period in which the first optical path and the second optical path are switched, the first and second light source means are turned off,
    Within the period in which the first optical path is formed, the first light source means emits light,
    A light source device that causes the second light source means to emit light during a period in which the second optical path is formed.
  2. Third light source means for emitting illumination light;
    Optical path synthesis means for synthesizing the optical path of the illumination light emitted from the light selection means and the optical path of the illumination light emitted from the third light source means,
    The light source device according to claim 1, wherein the control unit controls the third light source unit to emit light at least during the transition period.
  3.   3. The light source according to claim 1, wherein the light selection means is a rotating wheel or a rotating mirror that transmits one of the illumination lights emitted from the first and second light source means and reflects the other. 4. apparatus.
  4. First light source means and second light source means for emitting illumination light;
    Light selection means for selecting the first selection light or the second selection light from at least the illumination light incident from the first light source means and emitting the selected selection light or the second selection light;
    Optical path synthesis means for synthesizing the optical path of illumination light emitted from the second light source means and the optical path of the first or second selection light;
    Control means for controlling the light emission and extinction of each of the first and second light source means according to the state of the light selection means,
    The control means is a light source device that turns off the first light source means and emits the second light source means within a transition period in which the first converted light and the second converted light are switched.
  5.   5. The light source device according to claim 2, wherein the optical path synthesis unit performs optical path synthesis using a wavelength or polarization of illumination light.
  6.   A projector comprising the light source device according to any one of claims 1 to 5.
JP2007104056A 2007-04-11 2007-04-11 Light source device and projector Ceased JP2008261998A (en)

Priority Applications (1)

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JP2007104056A JP2008261998A (en) 2007-04-11 2007-04-11 Light source device and projector
PCT/JP2008/056905 WO2008126830A1 (en) 2007-04-11 2008-04-07 Light source device and projector

Publications (1)

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JP2012032634A (en) * 2010-07-30 2012-02-16 Casio Comput Co Ltd Light source unit and projector
JP2012042767A (en) * 2010-08-20 2012-03-01 Toshiba Corp Projector
JP2012128438A (en) * 2012-02-03 2012-07-05 Casio Comput Co Ltd Light source device, projection device, and projection method
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US8403492B2 (en) 2009-06-30 2013-03-26 Casio Computer Co., Ltd. Light source device, video projector and video projection method
JP2011028244A (en) * 2009-06-30 2011-02-10 Casio Computer Co Ltd Light source device, projection device and projection method
US8641205B2 (en) 2009-06-30 2014-02-04 Casio Computer Co. Ltd. Light source device having first light source, second light source, and control section to control drive timing of first light source and second light source such that drive pattern of second light source is inversion of drive pattern of first light source, and projection apparatus and projection method which utilize said light source device
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JP4711021B2 (en) * 2009-06-30 2011-06-29 カシオ計算機株式会社 Projection device
JP2011043719A (en) * 2009-08-21 2011-03-03 Casio Computer Co Ltd Light source device, projector, and projection method
JP2011044367A (en) * 2009-08-21 2011-03-03 Casio Computer Co Ltd Light source device, projector device, projection method, and program
US8444273B2 (en) 2009-08-21 2013-05-21 Casio Computer Co., Ltd. Light source device, projection apparatus, and projection method
US8272745B2 (en) 2009-08-21 2012-09-25 Casio Computer Co., Ltd. Light source device, projection apparatus, and projection method
JP2011070127A (en) * 2009-09-28 2011-04-07 Casio Computer Co Ltd Light source device, projection apparatus, and projection method
JP2011133673A (en) * 2009-12-24 2011-07-07 Casio Computer Co Ltd Projection device, projection method and program
JP2011191602A (en) * 2010-03-16 2011-09-29 Seiko Epson Corp Projector
JP2012032634A (en) * 2010-07-30 2012-02-16 Casio Comput Co Ltd Light source unit and projector
JP2012042767A (en) * 2010-08-20 2012-03-01 Toshiba Corp Projector
US8757808B2 (en) 2010-08-20 2014-06-24 Kabushiki Kaisha Toshiba Projector having light emission devices
JP2013088574A (en) * 2011-10-17 2013-05-13 Casio Comput Co Ltd Projection device, projection control method, and program
JP2012128438A (en) * 2012-02-03 2012-07-05 Casio Comput Co Ltd Light source device, projection device, and projection method
JP2014002416A (en) * 2013-09-20 2014-01-09 Casio Comput Co Ltd Control method of light source device
JP2015052788A (en) * 2014-10-01 2015-03-19 カシオ計算機株式会社 Rotating body and projection device
JP2015072480A (en) * 2014-10-23 2015-04-16 カシオ計算機株式会社 Rotating body and projection device

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