JP6439359B2 - Light source device and projector provided with the light source device - Google Patents

Description

  The present invention relates to a light source device and a projector including the light source device.

  2. Description of the Related Art In recent years, time division projectors that take out light of a plurality of wavelengths in a time division manner and form and project an image by sequentially modulating the extracted light of the plurality of wavelengths have become widespread. As a light source device used for such a time-division projector, for example, a light source that outputs white light and a rotating wheel to which a plurality of color filters are attached are used to convert white light emitted from the light source at a constant speed. The light is made incident on a rotating wheel that rotates in order to extract light of a plurality of wavelengths (for example, blue, green, and red light) in a time-sharing manner.

  In addition, by using a rotating wheel having a phosphor layer instead of a color filter by a light source that outputs single-wavelength light such as a laser diode, single-wavelength light emitted from a light source such as a laser diode is applied to the rotating wheel. There has also been proposed a light source device that extracts light of a plurality of wavelengths in a time division manner by making it incident. In such a light source device, as shown in Patent Document 1, a laser light source that emits light in a blue wavelength band is used as a light source, and light from the laser light source is transmitted between a rotating wheel and a phosphor layer. However, there is one in which a dichroic layer that reflects light in other wavelength bands is formed.

  With such a configuration, the blue light emitted from the laser light source enters the rotating wheel, passes through the dichroic layer, and enters the phosphor layer, and the light whose wavelength is converted by the phosphor is emitted in all directions. The Here, a part of the light emitted from the phosphor layer is also emitted in the direction returning to the laser light source side, but since the light is reflected by the dichroic layer, the light emitted from the phosphor layer is efficiently used. Can be used well.

JP 2011-1000016

  When light in the red wavelength region is emitted using a blue laser light source and a phosphor layer that generates red light, there is a problem that wavelength conversion efficiency by the phosphor is low.

  Accordingly, an object of the present invention is to provide a light source device capable of reinforcing the intensity of light in a specific wavelength band.

In order to solve the above problems, in one embodiment of the light source device according to the present invention, a plurality of light sources including first and second light sources that emit light of different wavelength bands,
A rotating wheel disposed at a position facing the plurality of light sources and transmitting light from the plurality of light sources,
A first region having a phosphor layer for converting the wavelength band of the light emitted from the first light source into light including the wavelength band of the light emitted from the second light source on the rotating wheel; ,
A second region that transmits the light emitted from the second light source as it is.

  With the configuration described above, when the light emitted from the first light source passes through the first region provided on the rotating wheel, the light includes the wavelength band of the light emitted from the second light source by the phosphor layer. And is emitted from the light source device. Further, when the light emitted from the second light source passes through the second region, it is emitted from the light source device while maintaining the wavelength band. Thereby, the intensity | strength of the light of the specific wavelength band radiate | emitted from a light source device can be reinforced with the light converted by the fluorescent substance layer and the light from a 2nd light source.

  As described above, the light source device according to the embodiment of the present invention can reinforce the intensity of light in a specific wavelength band.

It is a schematic diagram which shows the light source device which concerns on one embodiment of this invention. It is a schematic diagram which shows the structure of the rotation wheel with which the light source device which concerns on the same embodiment is provided. It is a graph which shows the content of the drive control of the various laser diodes in the light source device which concerns on the embodiment. It is a schematic diagram which shows other embodiment regarding the rotating wheel which concerns on the same embodiment. It is a graph which shows the content of the drive control of various laser diodes at the time of employ | adopting the rotation wheel of FIG. It is a schematic diagram which shows the form regarding formation of the dielectric film and fluorescent substance layer of the rotating wheel which the light source device which concerns on other embodiment of this invention has. 1 is a schematic diagram showing a projector according to an embodiment of the present invention.

  A light source device according to an embodiment of the present invention and a projector including the light source device will be described in detail below with reference to the drawings. First, an embodiment of a light source device according to the present invention will be described with reference to FIG. As shown in this figure, the light source device 1 of the present embodiment is roughly composed of a light source 10, a condensing lens 20, a rotating wheel 30, a motor 40, and a light receiving lens 50.

  The light source 10 is composed of a plurality of light sources including a laser diode 11B (first light source) that emits blue light and a laser diode 11R (second light source) that emits red light, and lights in different wavelength bands. Is emitted. Here, the wavelength band of the light emitted from the laser diode 11B is the first wavelength band, and the wavelength band of the blue light of 420 to 500 nm and the light emitted from the laser diode 11R is the second wavelength band. The red light is 575 to 780 nm. The light source 10 includes a plurality of laser diodes 11B and 11R. A plurality of laser diodes 11R are arranged near the main axis OA and a plurality of laser diodes 11B are arranged on the far side with the main axis OA of the condenser lens 20 as the center. doing.

  Specifically, a plurality of laser diodes 11R are arranged in a cylindrical shape, and a plurality of laser diodes 11B having shorter wavelengths than the plurality of laser diodes 11R are arranged concentrically around the laser diodes 11R. Thus, heat radiation is facilitated by disposing the blue light laser diode, which is generally said to have a greater heat dissipation amount than the red light laser diode, on the outside where it is more accessible to outside air. In this embodiment, a laser diode is used as a light source, but an LED may be used instead.

  Further, the light emitted from each laser diode passes through the corresponding collimator lens 12 and is emitted to the condenser lens 20 which is an optical lens. Note that some or all of the collimating lenses 12 may be omitted as necessary. The condensing lens 20 condenses the light emitted from the light source 10 so as to have a predetermined spot diameter on the surface of the rotating wheel 30. The rotating wheel 30 corresponding to the color wheel is a transparent disk-shaped member that transmits light, and the center thereof is fixed to the drive shaft 40 a of the motor 40. Here, glass, resin, sapphire, or the like can be used as the material of the rotating wheel 30 as long as the material has high light transmittance.

  FIG. 2 shows the appearance of the rotating wheel 30. In this figure, (a) shows a surface facing the light source 10 (hereinafter also referred to as “incident surface” or “surface”), and (b) shows a rotating wheel 30 viewed from the direction of arrow A shown in FIG. , That is, a surface facing the light receiving lens 50 (hereinafter also referred to as “exit surface” or “back surface”). Further, a spot SP indicated by a broken-line circle in FIG. 2A indicates a region where the incident light from the light source 10 condensed by the condenser lens 20 hits. Further, a fluorescent region FL indicated by a broken-line circle in FIG. 2B indicates a region where a phosphor layer described later emits light by incident light from the light source 10.

  As shown in FIG. 2, a plurality of transmission regions are formed concentrically on the rotating wheel 30. Specifically, four transmission regions TR1 (first region), TR2 (second region) are arranged in the circumferential direction. ), TR3 (third region), and TR4 (fourth region). Each of the transmission regions TR1 and TR4 is a fan-shaped region having an apex at the center of the rotating wheel 30 and an angle range of 120 °. Similarly, TR2 and TR3 are fan-shaped regions having an angle range of 30 ° and 90 °, respectively. In the rotating wheel 30 shown in FIG. 2A, a circle having a radius r may be used as an inner peripheral edge, and an arc region having a width W1 from there to the outer peripheral edge of the rotating wheel 30 may be used as a transmitting area. As shown in FIG. 2A, in the transmission regions TR1 and TR4 on the incident surface of the rotating wheel 30, a dielectric film is used as an annular optical member having a width W1 from the outer peripheral edge of the rotating wheel 30 toward the center. 31 is formed.

  The dielectric film 31 has a property that the reflectance varies depending on the wavelength of incident light (hereinafter also referred to as “incident light”), and reflects the wavelength band of the light emitted from the laser diode 11B. The ratio is low, and the reflectance is high for light in other wavelength bands. As a result, the light emitted from the laser diode 11B passes through the dielectric film 31, and further passes through the rotating wheel 30, but the light emitted from the laser diode 11R is reflected by the dielectric film 31, and the rotating wheel 30. Can not pass through. On the other hand, since the dielectric film 31 is not formed in the transmission regions TR2 and TR3, the light emitted from the laser diodes 11B and 11R emitted from the light source 10 can pass through the rotating wheel 30. It is possible.

In addition, phosphor layers 32 </ b> R and 32 </ b> G having a width W <b> 2 are formed on the emission surface of the rotating wheel 30 along the outer peripheral edge of the rotating wheel 30. Specifically, as shown in FIG. 2B, a phosphor layer 32R is formed in the transmission region TR1, and a phosphor layer 32G is formed in the transmission region TR4. Here, the width W2 of each phosphor layer is preferably narrower than the width W1 of the dielectric film described above. When the light from the laser diode 11B that has passed through the dielectric film 31 is irradiated, the phosphor layer 32R emits fluorescence including the wavelength band of the light emitted from the laser diode 11R. Therefore, it can be said that the phosphor layer 32R converts the wavelength band of the light emitted from the laser diode 11B into the wavelength band including the wavelength band of the light emitted from the laser diode 11R. Specific examples of the material of the phosphor layer 32R include (Sr, Ca) AlSiN ₃ : Eu, CaAlSiN ₃ : Eu, SrAlSiN ₃ : Eu, and K ₂ SiF ₆ : Mn.

  Here, the fluorescence of the phosphor layer 32R generated by the light emitted from the laser diode 11B has a Lambertian characteristic and is emitted not only to the light receiving lens 50 side but also to the light source 10 side. However, since the dielectric film 31 is formed in the transmission region TR1 as shown in FIG. 2A on the incident surface of the rotating wheel 30, and the generated fluorescence is reflected by the dielectric film 31, The light is emitted to the light receiving lens 50 side without being emitted to the light source 10 side. Thereby, the loss of the fluorescence generated in the phosphor layer 32R is reduced and can be efficiently used as the emitted light of the light source device 1.

The phosphor layer 32G formed in the transmission region TR4 generates green fluorescence including a wavelength band of about 500 to 560 nanometers when irradiated with light from the laser diode 11B that has passed through the dielectric film 31. To do. As an example of a specific material of the phosphor layer 32G, an oxide-based phosphor such as β-SiAlON: Eu, Lu ₃ Al ₅ O ₁₂ can be given. A part of the fluorescence of the phosphor layer 32G is emitted to the light source 10 side as in the case of the phosphor layer 32R, but is reflected by the dielectric film 31 and emitted to the light receiving lens 50 side.

  On the other hand, since the phosphor layers such as the transmission regions TR1 and TR4 are not formed in the transmission regions TR2 and TR3, the light from the laser diodes 11B and 11R passes through the rotating wheel 30 as it is to the light receiving lens 50 side. Emitted.

  Returning to FIG. 1, the motor 40 is a brushless DC motor, and is arranged such that the drive shaft 40 a and the main shaft OA of the condenser lens 20 are parallel to each other. Further, the rotation speed is based on the frame rate of the moving image to be reproduced (the number of frames per second, the unit is [fps]) which is fixed so that the surface of the rotary wheel 30 is perpendicular to the drive shaft 40a. In the direction indicated by arrow B. For example, when a moving image of 60 [fps] can be reproduced, the rotation speed of the rotating wheel 30 may be set to an integral multiple of 60 rotations per second. Further, the motor 40 is not limited to a brushless DC motor, and an AC motor, a stepping motor, or the like may be used. The light receiving lens 50 is a collimating lens, and converts the fluorescence generated in the phosphor layers 32R and 32G into parallel light, which is emitted as the light emitted from the light source device 1.

  In the light source device 1 having the above-described configuration, drive control (on / off control) of the laser diodes 11B and 11R of the light source 10 is performed according to the rotation angle of the rotary wheel 30. Here, the contents of drive control of the laser diodes 11B and 11R will be described with reference to FIG. FIG. 3 is a graph showing how the laser diodes 11B and 11R are controlled to be turned on / off while the rotating wheel 30 makes one rotation. Here, the reference position of the rotary wheel 30 is defined as the boundary between the transmission regions TR1 and TR2, and when the spot SP shown in FIG. 2A is formed at this reference position, the rotation angle of the rotary wheel 30 = It is set to 0 °.

  Therefore, as shown in FIGS. 2A and 3, the spot SP is located in the transmission region TR1 and exceeds 120 ° until the rotation angle of the rotating wheel 30 exceeds 0 ° and reaches 120 °. Until it reaches 240 °, it is located in the transmission region TR4, and it is located in the transmission region TR3 until it exceeds 240 ° and reaches 330 °, and it exceeds 360 ° and becomes 360 ° (that is, 0 °). Until this time, it is located in the transmission region TR2.

  As shown in FIG. 3, while the spot SP is located in the transmission region TR1, the laser diode 11R is turned off and 11B is turned on, and the red fluorescence generated in the phosphor layer 32R is emitted to the light receiving lens 50. Further, while the spot SP is located in the transmission region TR4, the laser diode 11R is turned off and 11B is turned on, and the green fluorescence generated in the phosphor layer 32G is emitted to the light receiving lens 50. Further, while the spot SP is located in the transmission region TR3, the laser diode 11R is turned off and the laser diode 11B is turned on, and the emitted light (blue light) transmitted through the rotating wheel 30 is emitted to the light receiving lens 50 as it is. Let On the other hand, while the spot SP is located in the transmission region TR2, the laser diode 11R is turned on and 11B is turned off contrary to the above. Thereby, only the emitted light (red light) of the laser diode 11 </ b> R is emitted to the light receiving lens 50.

  As described above, with the rotation of the rotating wheel 30, red light, green light, and blue light are repeatedly emitted in this order from the light source device 1. Further, by performing on / off control of the laser diodes 11B and 11R according to the rotation angle of the rotation wheel 30, in addition to the red fluorescence generated in the phosphor layer 32R during one rotation of the rotation wheel 30, The emitted light (red light) from the laser diode 11R is also used as the emitted light of the light source device 1. Conventionally, when a red laser light source is added to a light source to supplement the intensity of red light, the red light emitted from the laser light source is reflected by the dielectric film when entering the rotating wheel. It was difficult to compensate for the red light emitted from. However, in the above-described embodiment, the red light of the laser diode 11R is used as the outgoing light of the light source device 1 in order to transmit the outgoing light of the laser diode 11R to the transmission region TR2 where the dielectric film and the phosphor layer are not formed. Is done. Thereby, since the period during which the red light is emitted while the rotating wheel 30 makes one rotation is extended, the amount of red light can be reinforced. Further, since the red fluorescence generated in the phosphor layer 32R is emitted following the light (red light) transmitted from the laser diode 11R that has passed through the transmission region TR2, red light is emitted during one rotation of the rotating wheel 30. When the light source device 1 is used in the projector 100 described later, the DMD element 110 (see FIG. 7) can be easily controlled.

(Other Embodiments Regarding Type and Number of Phosphor Layers)
In the rotating wheel 30 shown in FIG. 2, the phosphor layer 32R is formed in the transmission region TR1 to generate red fluorescence, and the phosphor layer 32G is formed in the transmission region TR4 to generate green fluorescence. On the other hand, in the rotating wheel 30 ′ shown in FIG. 4, a transmission region TR5 (fifth region) having an angle range of 90 ° with the center as an apex is added, and the laser diode 11B is formed on the emission surface of this transmission region. The phosphor layer 32Y which generates yellow fluorescence by the light of is formed. Here, as an example of a specific material of the phosphor layer 32Y that generates yellow fluorescence, yttrium / aluminum / garnet phosphor (YAG phosphor) and lutetium / aluminum / garnet phosphor (LAG phosphor) Body). Further, the addition of the transmission region TR5 narrows the angle range of the transmission regions TR1 and TR4 to 90 °, and the angle range of the transmission region TR3 to 60 °.

  Next, the contents of drive control of the laser diodes 11B and 11R when the rotating wheel 30 'shown in FIG. 4 is used will be described with reference to FIG. FIG. 5 is a graph similar to FIG. 3 and shows how the laser diodes 11B and 11R are controlled on / off while the rotating wheel 30 'rotates once. Here, also in the rotating wheel 30 ′, the reference position is defined as the boundary between the transmission regions TR1 and TR2, and when the spot SP shown in FIG. 4A is formed at the reference position, the rotating wheel 30 ′. The rotation angle is set to 0 °.

  Accordingly, as shown in FIGS. 4A and 5, the spot SP is located in the transmission region TR1 until the rotation angle of the rotary wheel 30 ′ exceeds 0 ° and reaches 90 °, and is 90 °. It is located in the transmission region TR4 until it reaches 180 ° beyond, and it is located in the transmission region TR5 until it exceeds 270 ° beyond 180 ° and until it reaches 330 ° beyond 270 °. Is located in the transmissive region TR3, and is located in the transmissive region TR2 until it exceeds 330 ° and reaches 360 ° (that is, 0 °).

  As shown in FIG. 5, while the spot SP is located in the transmission region TR1, the laser diode 11R is turned off and 11B is turned on, and the red fluorescence generated in the phosphor layer 32R is emitted to the light receiving lens 50. Further, while the spot SP is located in the transmission region TR4, the laser diode 11R is turned off and 11B is turned on, and the green fluorescence generated in the phosphor layer 32G is emitted to the light receiving lens 50. Next, while the spot SP is positioned in the transmission region TR5, the laser diode 11R is turned off and 11B is turned on. At this time, the phosphor layer 32Y converts the wavelength of the emitted light from the laser diode 11B into the yellow wavelength band, but transmits a part of the light emitted from the laser diode 11B while maintaining the wavelength band. Thereby, yellow fluorescence generated in the phosphor layer 32Y and a part of blue light transmitted through the phosphor layer 32Y are additively mixed and recognized as white light.

  Subsequently, while the spot SP is located in the transmission region TR3, the laser diode 11R is turned off and 11B is turned on, and the emitted light (blue light) of the laser diode 11B transmitted through the rotating wheel 30 ′ is sent to the light receiving lens 50. Let it emit. Further, while the spot SP is located in the transmission region TR2, the laser diode 11R is turned on and 11B is turned off, contrary to the above. Thereby, the emitted light (red light) of the laser diode 11R passes through the transmission region TR2 as it is and is emitted to the light receiving lens 50 while maintaining the wavelength band.

  Thus, in addition to the red fluorescence generated in the phosphor layer 32R during one rotation of the rotating wheel 30 ′, the emitted light (red light) from the laser diode 11R is also used as the emitted light of the light source device 1. Therefore, the emission period of red light during one rotation of the rotating wheel 30 ′ is extended, and the intensity of red light is reinforced. Further, by providing a white light emission period during one rotation of the rotating wheel 30 ′, a bright image can be projected when used as a light source of a projector described later, for example.

  In the light source 10 shown in FIG. 1, a plurality of laser diodes 11R are arranged in a cylindrical shape, and a plurality of laser diodes 11B having shorter wavelengths than the plurality of laser diodes 11R are arranged concentrically around it. However, conversely, a plurality of laser diodes 11B are concentrically arranged at equal intervals around the main axis OA of the lens, and a plurality of laser diodes 11R are centered on the main axis OA of the lens outside. You may arrange | position at the equal intervals in concentric form. In this case, the rotating wheel is provided with a phosphor layer 32R that fluoresces red (for example, about 620 nanometers), and the red light is transmitted when it enters the phosphor layer within a predetermined angle range, and is out of the predetermined incident angle range. A dielectric film having a property of reflecting when it is incident may be provided. For example, such a dielectric film has an angle heterogeneity such that light incident at a high angle (for example, 45 degrees or more) is transmitted and light incident at a low angle (for example, 0 degrees to 45 degrees) is reflected. By using the dielectric film, light incident on the dielectric film from the laser diode 11R can be transmitted, and most of the light returning from the phosphor layer 32R to the dielectric film can be reflected, and wavelength conversion is performed by the phosphor layer 32R. It is preferable in that the emitted light can be used effectively.

  Further, in the on / off control of the laser diodes 11R and 11B when the rotating wheel shown in FIG. 2 or FIG. 4 is used, the rotation angle of the rotating wheel 30 or 30 'may be detected by a known method. For example, the rotation angle may be detected based on a signal output from a hall sensor IC built in the motor 40, or the rotation angle may be detected based on a signal output from a photo reflector or a photo interrupter disposed near the motor 40. Alternatively, a stepping motor may be used as the motor 40, and the rotation angle may be determined based on the number of switching phases to be excited.

  Further, the transmission regions TR2 and TR3 of the rotating wheels 30 and 30 ′ are both transparent regions (hereinafter simply referred to as “transparent”) made of only the material of the rotating wheel 30 on which the dielectric film 31 and the phosphor layers 32R and 32G are not formed. Therefore, the angular range of the transmission regions TR2 and TR3 is defined by a period during which the laser diode 11R is on and a period during which the laser diode 11B is on. Thus, the ratio of the period during which the laser diodes 11R and 11B are turned on (that is, emits light) while the spot SP is located in the range from the transmission region TR3 to TR2 (the period during which the laser diode 11R is turned on). The amount of red light emitted from the light source device 1 can be adjusted.

  Further, in the rotating wheel shown in FIGS. 2 and 4, a diffusing surface for diffusing light is formed in the transmission region TR3, and the blue light emitted from the laser diode 11B is transmitted through the scattering surface to move the blue light. Speckle noise may be reduced by diffusing it periodically.

  A plurality of transparent regions may be provided on the rotating wheels 30 and 30 '. For example, in the rotating wheel 30 shown in FIG. 2, a transparent region having a predetermined angle range is provided between the transmission regions TR1 and TR4 (rotation angle of 0 ° to 240 °), and the spot SP is formed in the transparent region. While positioned, only the laser diode 11R may be turned on to further reinforce the red light emitted from the light source device 1. Here, in the case where a plurality of transparent regions are provided, the size (angle range) of each region can be appropriately determined including not only each transparent region but also other transmissive regions where the phosphor layer is formed. Needless to say.

  Further, in the rotating wheels 30 and 30 ′ shown in FIG. 2 and FIG. 4, a dielectric film that transmits the light emitted from the laser diode 11R and reflects the light emitted from the laser diode 11B is transmitted to the transmission region TR2. The dielectric film 31 may be formed in the transmissive region TR3. By forming various dielectric films in this manner, even if both of the laser diodes 11R and 11B are always turned on, red light and green light (in the rotating wheel 30 ′) are emitted from the light source device 1 as the rotating wheel 30 rotates. Further, white light) and blue light can be repeatedly emitted.

(Other Embodiments Regarding Formation of Dielectric Film and Phosphor Layer)
In the embodiment shown in FIG. 1, in each transmission region of the rotating wheel 30, a dielectric film is formed on the surface on the incident surface side, a phosphor layer is formed on the surface on the output surface side, Although the dielectric film is formed at a position facing the dielectric film, the dielectric film and the phosphor layer may be formed in other forms. For example, in the form shown in FIG. 6A, the dielectric film 31 is formed on the emission surface of the rotating wheel 30, and the phosphor layer 32R is further formed on the upper surface thereof. That is, the dielectric film as an optical member is disposed on the surface opposite to the surface facing the light source in the transmission region of the rotating wheel 30, and the phosphor layer is formed on the surface of the dielectric film. Yes. 6B, the dielectric film 31 is formed on the incident surface of the rotating wheel 30, and in the thickness direction of the rotating wheel 30, the surface of the phosphor layer 32R and the emitting surface of the rotating wheel 30 are formed. And are formed to match.

  6C, in the thickness direction of the rotating wheel 30, the surface of the dielectric film 31 coincides with the incident surface of the rotating wheel 30, and the surface of the phosphor layer 32R is the exit surface of the rotating wheel 30. It is formed to match. In the form shown in FIG. 6D, the surface of the dielectric film 31 is formed so as to coincide with the incident surface of the rotating wheel 30 in the thickness direction of the rotating wheel 30, and the phosphor layer 32 </ b> R is emitted from the rotating wheel 30. It is formed on the surface. In the form shown in FIG. 6E, the dielectric film 31 a is embedded in the rotating wheel 30, and the phosphor layer 32 </ b> R is formed on the emission surface of the rotating wheel 30. Furthermore, in the form shown in FIG. 6F, the dielectric film 31a and the phosphor layer 32R are embedded in the rotating wheel 30.

  As for the formation of the dielectric film and the phosphor layer, respectively, (i) formed on the incident surface or the emission surface, (ii) formed so that the surface coincides with the incident surface or the emission surface, or ( iii) The form of embedding in the rotating wheel 30 can be combined as appropriate. However, in any case, it is necessary to form the dielectric film 31 closer to the light source 10 than the phosphor layer 32R. In addition, the phosphor layer in FIG. 6 illustrates the phosphor layer 32R that generates red fluorescence as an example, but the phosphor layer that generates fluorescence of other colors is also illustrated in FIG. Various forms are applicable.

(Application example of light source device 1)
Next, a schematic configuration when the light source device 1 shown in FIG. 1 is used as a light source device in a so-called one-chip DLP projector will be described with reference to FIG. In FIG. 7, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. Here, an example of the minimum configuration will be described, and the number of lenses and other optical members can be appropriately changed.

  In the projector 100 shown in FIG. 7, the light emitted from the light source device 1 is reflected by a DMD (Digital Micromirror Device) element 110 that is a light modulation unit, is condensed by a lens 120 that is a projection unit, and is collected on a screen S. Projected. The DMD element 110 is an array of fine mirrors corresponding to each pixel of the image projected on the screen S, and the light emitted to the screen S by changing the angle of each mirror is expressed in units of microseconds. Can be turned on / off. Here, when the angle of the mirror is such that the light emitted from the light source device 1 is reflected to the lens 120, the mirror is turned on, and when the mirror is not reflected to the lens 120, the mirror is turned off.

  In addition, the gradation of light incident on the lens 120 is changed according to the ratio of the time during which each mirror is turned on and the time when the mirror is turned off, and gradation display based on the image data of the image to be projected becomes possible. Thereby, a color image (including a moving image) is projected onto the screen S by performing gradation control on each of red light, green light, and blue light sequentially emitted from the light source device 1 by using individual mirrors. be able to. The lens 120 is mainly composed of a projection lens, and projects an image formed by the DMD element 110 onto the screen S after being enlarged to a predetermined size.

  In the present embodiment, the DMD element is used as the light modulation means. However, the present invention is not limited to this, and any other light modulation element can be used depending on the application. The light source device according to the present invention and the projector using the light source device are not limited to the above-described embodiments, and various other embodiments are included in the present invention.

DESCRIPTION OF SYMBOLS 1 Light source device 10 Light source 11B, 11R Laser diode 12 Collimating lens 20 Condensing lens 30, 30 'Rotating wheel 31 Dielectric film 32R, 32G, 32Y Phosphor layer 40 Motor 40a Drive shaft 50 Light receiving lens 100 Projector 110 DMD element (light Modulation means)
120 lens (projection means)

Claims (8)

A plurality of light sources including first and second light sources that emit light of different wavelength bands;
A rotating wheel that is disposed at a position facing the plurality of light sources and transmits light from the plurality of light sources;
With
A first region having a phosphor layer for converting the wavelength band of the light emitted from the first light source into light including the wavelength band of the light emitted from the second light source on the rotating wheel; ,
And a second region that transmits the light emitted from the second light source as it is,
The first light source is a light source that emits light in a blue wavelength band;
The second light source is a light source that emits light in a red wavelength band;
A light source device that emits light in a red wavelength band from the first region .   In the first region of the rotating wheel, the light in the wavelength band of the light emitted from the first light source is transmitted to the plurality of light sources from the phosphor layer, and emitted from the second light source. The light source device according to claim 1, further comprising a dielectric film that reflects the light in the wavelength band of the light.   The light source device according to claim 1, wherein the first region and the second region are disposed adjacent to each other. Before SL phosphor layer, the light in the wavelength band of the blue, according to any one of the phosphor for wavelength-converting the light of the red wavelength band from claim 1, wherein the early days including 3 Light source device. In the rotating wheel,
The first region for wavelength-converting the light in the blue wavelength band emitted from the first light source into light including the red wavelength band;
The second region that directly transmits the light in the red wavelength band emitted from the second light source;
A third region that directly transmits the light in the blue wavelength band emitted from the first light source;
Claims, characterized in that a fourth region having a phosphor layer for wavelength-converting the light having a green wavelength band light in a wavelength band of the emitted said blue from the first light source is provided Item 5. The light source device according to any one of Items 1 to 4 .   The rotating wheel is further provided with a fifth region having a phosphor layer for wavelength-converting light in the blue wavelength band emitted from the first light source into light including a yellow wavelength band. The light source device according to claim 5. The plurality of light sources includes a collimating lens;
The light source according to any one of claims 1 to 6, wherein a condensing lens that condenses light from the plurality of light sources is disposed between the plurality of light sources and the rotating wheel. apparatus. The light source device according to any one of claims 1 to 7,
A light modulation unit that sequentially modulates light of a plurality of wavelength bands emitted from the light source device to form an image based on image data;
Projection means for enlarging and projecting the image;
With projector.

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