JP6007533B2 - Light source device and projector device - Google Patents

Description

  The present invention relates to a light source device using a semiconductor light emitting element and a projector device including the same.

  2. Description of the Related Art Conventionally, various proposals have been made regarding projector apparatuses that project an image using a semiconductor light emitting element as a light source. As one of such projector apparatuses, a projector apparatus that projects an image using a semiconductor light emitting element that emits visible light has been proposed. For example, a projector device has been proposed in which a phosphor that receives blue light and emits green light is provided, and the phosphor is irradiated with blue light. In addition, by forming a phosphor on a freely configured wheel and rotating the wheel while irradiating the phosphor with light, continuous light incidence on the same part of the phosphor is prevented. For example, Patent Document 1 proposes such a projector apparatus.

  Further, in the projector device of Patent Document 1, a surface for transmitting and diffusing blue light is formed on the wheel. By rotating the wheel so that blue light is incident on the transmission diffusion surface, the blue light source for exciting the phosphor can be used as the light source for blue image projection.

JP 2011-013320 A

  Here, in Patent Document 1, in order to use the excitation blue light source as the light source for blue image projection, a light guide optical system for guiding the blue light transmitted and diffused by the wheel to the light tunnel is necessary. is there. In order to reduce the size of the projector device and reduce the number of parts, it is desirable to make the light guide optical system as small as possible.

  The present invention has been made in view of the above circumstances, and in particular, provides a light source device capable of reducing the blue light guiding optical system for blue image projection and a projector device including the same. For the purpose.

In order to achieve the above object, a light source device according to a first aspect of the present invention includes a blue light source that emits light in a blue wavelength band, and a rotatable main body in which a reflecting surface is formed on at least a part of a peripheral edge. And a slope formed on the periphery of the main body so as to have a right-angled isosceles triangle-shaped cross section, and a light formed in contact with the main body and light in the blue wavelength band is transmitted to the reflection surface. A first segment formed with a surface and a second surface that transmits and emits light in the blue wavelength band reflected by the reflecting surface, and receives light in the green wavelength band by receiving light in the blue wavelength band An annular prism having a second segment formed with a third surface coated with a phosphor to be emitted; a light having a blue wavelength band emitted from the first segment; The green wavelength band light emitted from the second segment; Comprising an optical system for guiding each on the same optical path, wherein the first segment, when the first segment is positioned on the optical axis of the blue light source by the rotation, as the first surface The glass surface is perpendicular to the optical axis of the blue light source, and the transmission diffusion surface as the second surface is formed on the reflection optical axis of the reflection surface formed on the main body. segments, when said second segment by rotation is located on the optical axis of the blue light source, that phosphor surface as the third surface has been formed so as to be perpendicular to the optical axis of the blue light source It is characterized by that.

  In order to achieve the above object, a projector device according to a second aspect of the present invention includes a light source device, a display element, a light source side optical system that guides light from the light source device to the display element, A projection optical system that projects an image emitted from a display element, and a control unit that controls the light source device and the display element, wherein the light source device is the light source device according to the first aspect. And

  According to the present invention, in particular, it is possible to provide a light source device capable of reducing the blue light guide optical system for projecting a blue image and a projector device including the same.

It is a figure which shows schematic function structure of the data projector device which concerns on one Embodiment of this invention. It is a figure which shows an example of a structure of the light source part which concerns on one Embodiment of this invention. It is a figure which shows the structure of a wheel. It is a figure shown about operation | movement of the wheel in B field. It is a figure shown about operation | movement of the wheel in G field.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, an example in which the light source device according to the present embodiment is applied to a DLP (registered trademark) data projector device will be described.

  FIG. 1 is a diagram showing a schematic functional configuration of a data projector apparatus 10 according to an embodiment of the present invention. In the following description, it is assumed that the light is “reflected” by the “mirror”. In principle, the mirror totally reflects the incident light.

  The input unit 11 includes, for example, a pin jack (RCA) type video input terminal, audio input terminal, HDMI (High Definition Multimedia Interface) (registered trademark) input terminal, and the like, and supplies signals external to the data projector apparatus 10. Image data and audio data of various standards such as the NTSC system are input from the source, and the image data is sent to the image converter 12 and the audio data is sent to the audio processor 22 via the system bus SB. Further, when the input image data and sound data are analog signals, the input unit 11 digitizes the image data and sound data and sends the digitized data to the image conversion unit 12.

  The image conversion unit 12 is also referred to as a scaler. The image conversion unit 12 converts the image data input from the input unit 11 into image data having a predetermined format suitable for projection, and sends the image data to the projection processing unit 13. At this time, the image conversion unit 12 superimposes data such as symbols indicating various operating states for OSD (On Screen Display) on the image data as necessary.

  The projection processing unit 13 drives the micromirror element 14 that is a spatial light modulation element in accordance with the image data sent from the image conversion unit 12. The driving cycle of the micromirror element 14 is set according to a value obtained by multiplying the frame rate of the image data, the number of color component divisions, and the number of display gradations of the image data. For example, when the frame rate is 60 fps, the number of color component divisions is 3 (three colors of RGB), and the number of display gradations of image data is 256, the driving cycle of the micromirror element 14 is 1 / (60 × 3 × 256) = 1/46080 seconds. Further, the projection processing unit 13 drives the light source unit 15 according to the image data sent from the image conversion unit 12.

  The micromirror element 14 is a display element configured by a plurality of movable micromirrors arranged in an array. The micromirrors are arranged corresponding to, for example, WXGA (Wide eXtended Graphic Array) (horizontal 1280 pixels × vertical 800 pixels). Each micromirror is configured to be able to change the tilt angle at high speed. Each micromirror changes the outgoing optical path of the light incident from the light source unit 15 according to the inclination angle. That is, each micro mirror reflects incident light toward the projection lens unit 17 when it is in an on state to form a light image, and when it is in an off state, each micro mirror reflects the incident light into the projection lens unit 17. Reflect towards the outside.

  The light source unit 15 as the light source device in the present embodiment emits light of a plurality of colors including primary color lights of R, G, and B toward the mirror 16 in a time division manner. A detailed configuration of the light source unit 15 will be described later. The mirror 16 totally reflects the light incident from the light source unit 15 toward the micromirror element 14.

  The projection lens unit 17 includes therein an optical system configured to project a light image formed by the reflected light from the micromirror element 14 onto a projection surface (not shown).

  The CPU 18 controls the operation of each circuit described above. The CPU 18 is connected to the main memory 19 and the program memory 20. The main memory 19 is composed of, for example, an SRAM, and functions as a work memory when controlled by the CPU 18. The program memory 20 is composed of an electrically rewritable non-volatile memory, and stores an operation program executed by the CPU 18 and various fixed data.

  The CPU 18 is also connected to the operation unit 21. The operation unit 21 includes a key operation unit provided in the main body of the data projector device 10 and an infrared light receiving unit that receives infrared light from a dedicated remote controller (not shown) of the data projector device 10. When a unit or a remote controller is operated, operation signals corresponding to those operations are output to the CPU 18. The CPU 18 controls various operations of the data projector device 10 according to the operation signal.

  Further, the CPU 18 is also connected to the sound processing unit 22 via the system bus SB. The sound processing unit 22 includes a sound source circuit such as a PCM sound source. The audio processing unit 22 converts the audio data input via the input unit 11 into analog data, inputs the audio data to the speaker unit 23, and drives the speaker unit 23 to generate sound from the speaker unit 23. Further, the sound processing unit 22 generates a beep sound or the like from the speaker unit 23 as necessary.

  FIG. 2 is a diagram illustrating an example of the configuration of the light source unit 15 according to the first embodiment of the present invention. The light source unit 15 in the present embodiment is configured to emit any of RGB light from the light emitting unit using two semiconductor light emitting elements.

  The blue light source 31 is a semiconductor light emitting element that emits light B in the blue wavelength band, and is configured by, for example, a laser diode. Here, although one blue light source 31 is illustrated in FIG. 2, a plurality of blue light sources 31 may be arranged.

  The dichroic mirror 32 is a mirror arranged on the optical axis of the blue light source 31 so as to reflect light in the green wavelength band and transmit light in other wavelength bands. The dichroic mirror 32 is disposed at an angle of 45 ° with respect to the optical axis of the lens 33.

  The lens 33 condenses the blue light B transmitted through the dichroic mirror 32 and the green light G emitted from the wheel 34. Here, in FIG. 2, only one lens 33 is shown. However, the same function as the lens 33 may be realized by a plurality of lenses.

  The wheel 34 is disposed so as to form an angle of 45 ° with respect to the optical axis of the lens 33. The wheel 34 has a green (G) segment for emitting light G in the green wavelength band and a blue (B) segment for emitting light B in the blue wavelength band, and is rotated by a motor. It is configured freely.

  The lens 35 is disposed on the reflection optical axis of the wheel 34 so as to form an angle of 90 ° with respect to the optical axis of the lens 33, and collects the blue light B emitted from the wheel 34. Similar to the lens 33, the lens 35 may be composed of a plurality of lenses.

  The reflection mirror 36 is a mirror that reflects blue light. The reflection mirror 36 is disposed at an angle of 45 ° with respect to the optical axis of the lens 35.

  The lens 37 is disposed on the reflection optical axis of the reflection mirror 36 and collects incident light. Similarly to the lenses 33 and 35, the lens 37 may be composed of a plurality of lenses.

  The red light source 38 is a semiconductor light emitting element that emits light R in the red wavelength band, and is configured by, for example, a light emitting diode or a laser diode. In FIG. 2, only one red light source 38 is illustrated, but a plurality of red light sources 38 may be arranged.

  The lens 39 is disposed on the reflection optical axis of the dichroic mirror 32 and collects incident light. Similarly to the lenses 33 and 35, the lens 39 may be composed of a plurality of lenses.

  The dichroic mirror 40 is a mirror that is disposed on the optical axis of the lens 35 and the lens 39 and configured to transmit light in the blue wavelength band and reflect light in other wavelength bands. The dichroic mirror 40 is disposed at an angle of 45 ° with respect to the optical axes of the lens 33 and the lens 39.

  The light tunnel 41 advances the incident light from the dichroic mirror 40 while totally reflecting it inside, and emits it as surface uniform light. The light tunnel 41 functions as a light emitting unit of the light source unit 15.

FIG. 3 is a diagram showing the configuration of the wheel 34. 3 is a front view of the wheel 34, and the right side of FIG. 3 is a side view.
As shown in FIG. 3, the wheel 34 has a disk-shaped wheel body 341. The wheel body 341 has a reflective surface such as alumina on the surface. The wheel main body 341 is attached to a motor 343 and is configured to be rotatable about the rotation axis O by the rotation of the motor 343.

  An annular prism 342 having a right isosceles triangular cross section as shown in a side view is formed on the peripheral edge of the wheel body 341. The prism 342 is formed so that the slope is in contact with the wheel body 341. The prism 342 forms the green (G) segment and the blue (B) segment on the remaining two surfaces.

The G segment is formed so that the phosphor surface 342 b as the third surface is orthogonal to the optical axis of the blue light source 31 when the G segment is positioned on the optical axis of the blue light source 31 by the rotation of the motor 343. . The remaining surface is, for example, a glass surface 342a. That is, the glass surface 342 a is arranged in a direction parallel to the optical axis of the blue light source 31 when the G segment is positioned on the optical axis of the blue light source 31 by the rotation of the motor 343. Phosphor surface 342b is a surface where the phosphor is applied for emitting light in the green wavelength band by receiving light B of blue wavelength band. The phosphor surface 342b has a reflective surface such as alumina formed on the back surface thereof.

When the B segment is positioned on the optical axis of the blue light source 31 by the rotation of the motor 343, the glass surface 342a as the first surface is orthogonal to the optical axis of the blue light source 31, and the B segment is the second surface. The transmission diffusing surface 342c is positioned on the reflection optical axis of the reflection surface formed on the wheel body 341. That is, the transmission diffusion surface 342 c is arranged in a direction parallel to the optical axis of the blue light source 31 when the B segment is positioned on the optical axis of the blue light source 31 by the rotation of the motor 343. The transmission diffusion surface 342c is formed, for example, by roughening the glass surface by sandblasting or etching, and transmits and diffuses the light transmitted through the glass surface 342a and reflected by the reflection surface formed on the wheel body 341.

  The operation of the light source unit 15 shown in FIGS. 2 and 3 will be described. The operation of the light source unit 15 is executed by the projection processing unit 13 under the control of the CPU 18. The projection processing unit 13 performs time-sharing control on the light emission timing of the blue light source 31 and the red light source 38 and the rotation timing of the wheel 34 in the light source unit 15 so that the image represented by the image data is projected on the projection plane.

  A projection image for one frame (one screen) is composed of projection images of a plurality of fields. In each field, a projected image of a different color is projected onto the projection plane. One frame has at least three fields of an R field, a B field, and a G field. The R field is a field for projecting a red projection image onto the projection plane. The B field is a field for projecting a blue projection image onto the projection plane. The G field is a field for projecting a green projection image onto the projection plane.

  In the R field, the projection processing unit 13 causes the red light source 38 to emit light. The red light R emitted from the red light source 38 reaches the dichroic mirror 32. As described above, since the dichroic mirror 32 is configured to transmit light other than the light in the green wavelength band, the red light R passes through the dichroic mirror 32 and is collected by the lens 39, and is then reflected by the dichroic mirror. 40. As described above, the dichroic mirror 40 is configured to transmit the light in the blue wavelength band and reflect the light in the other wavelength bands. Therefore, the red light R is reflected by the dichroic mirror 40 to be light. The light enters the tunnel 41. The red light R is reflected by the inner surface of the light tunnel 41, is emitted from the light tunnel 41 as surface uniform light, and reaches the micromirror element 14.

  Further, the projection processing unit 13 controls on / off of each micromirror constituting the micromirror element 14 according to the gradation of the red component of the input image data. As described above, each of the micromirrors constituting the micromirror element 14 reflects the incident light toward the projection lens unit 17 when in the on state, and reflects the incident light when in the off state. Reflected out of the projection lens unit 17. With such a configuration, the red light R is projected onto the pixel position on the projection surface corresponding to the micromirror as many times as the micromirror is turned on during the R field. This is equivalent to the projection of a red projected image having a gradation corresponding to the image data when viewed in terms of time average.

  In the B field, the projection processing unit 13 causes the blue light source 31 to emit light and rotates the motor 343 so that the B segment is positioned on the optical axis of the blue light source 31. The blue light B emitted from the blue light source 31 reaches the dichroic mirror 32.

  As described above, since the dichroic mirror 32 is configured to transmit light other than the light in the green wavelength band, the blue light B is transmitted through the dichroic mirror 32, collected by the lens 33, and the wheel 34. Is incident on the B segment. Here, the B segment is formed such that the glass surface 342a is positioned on the optical axis of the blue light source 31, as shown in FIG. Therefore, the blue light B is transmitted through the glass surface 342a and reflected by the reflecting surface formed on the wheel body 341 in the 90 ° direction. Since the transmission diffusion surface 342c is positioned in the 90 ° direction, the blue light B that has passed through the transmission diffusion surface 342c is diffused in the direction of the lens 35. Here, the reason why the blue light B is diffused is that a laser diode is used for the blue light source 31.

  The blue light B emitted from the wheel 34 is collected by the lens 35, reflected by the reflection mirror 36, and reaches the dichroic mirror 40. As described above, since the dichroic mirror 40 is configured to transmit light in the blue wavelength band and reflect light in other wavelength bands, the blue light B transmits the light through the dichroic mirror 40. The light enters the tunnel 41. The blue light B is reflected by the inner surface of the light tunnel 41, is emitted from the light tunnel 41 as surface uniform light, and reaches the micromirror element 14.

  The projection processing unit 13 controls on / off of each micromirror of the micromirror element 14 in accordance with the gradation of the blue component of the input image data. Thereby, as a time average, a blue image of a predetermined gradation is projected.

  In the G field, the projection processing unit 13 causes the blue light source 31 to emit light and rotates the motor 343 so that the G segment is positioned on the optical axis of the blue light source 31. The blue light B emitted from the blue light source 31 reaches the dichroic mirror 32.

  As described above, since the dichroic mirror 32 is configured to transmit light other than the light in the green wavelength band, the blue light B is transmitted through the dichroic mirror 32, collected by the lens 33, and the wheel 34. Is incident on the G segment.

  Here, the G segment is formed so that the phosphor surface 342b is positioned on the optical axis of the blue light source 31, as shown in FIG. Therefore, the blue light B is incident on the phosphor surface 342b. Green light G is emitted toward the lens 33 from the phosphor surface 342b. Here, the green light G from the phosphor surface 342 b is emitted not only in the direction toward the lens 33 but also in the direction of the wheel 34. Therefore, by forming a reflecting surface on the wheel main body 341 and also forming a reflecting surface 3421b on the phosphor surface 342b, light directed from the phosphor surface 342b toward the wheel 34 is also reflected toward the lens 33. It is possible to improve the utilization efficiency of the green light G.

  The green light G emitted from the wheel 34 is collected by the lens 33 and reaches the dichroic mirror 32. As described above, since the dichroic mirror 32 is configured to reflect light in the green wavelength band, the green light G is reflected by the dichroic mirror 32, collected by the lens 39, and reaches the dichroic mirror 40. . As described above, the dichroic mirror 40 is configured to transmit light in the blue wavelength band and reflect light in the other wavelength bands, so that the green light G is reflected by the dichroic mirror 40 and light The light enters the tunnel 41. The green light G is reflected by the inner surface of the light tunnel 41, is emitted from the light tunnel 41 as surface uniform light, and reaches the micromirror element 14.

  Further, the projection processing unit 13 controls on / off of each micromirror of the micromirror element 14 according to the gradation of the green component of the input image data. Thereby, as a time average, a green image of a predetermined gradation is projected.

  By the operation of one frame described above, it is possible to display a projection image of an arbitrary color at an arbitrary pixel position on the projection plane as a time average. A field in which a plurality of light sources emit light simultaneously in one field may be added.

  As described above, according to the present embodiment, a prism having a cross section of a right isosceles triangle is formed on the wheel 34, thereby generating green light, changing the optical path of blue light, and transmitting blue light. Diffusion can be done on one wheel. Thereby, it is possible to reduce the number of parts of the light source device as a whole by reducing the blue light guiding optical system.

  Here, in the present embodiment, the transmission diffusion surface 342c is formed in the B segment because a laser diode is used as the blue light source 31 for exciting green light. Depending on the light source, it is not always necessary to form the transmission diffusion surface 342c in the B segment, and it may be a simple transmission surface (glass surface 342a).

  In the present embodiment, an example in which a reflecting surface is formed on the entire surface of the wheel main body 341 is shown. This reflecting surface is used for reflecting green light in the G segment and changing the optical path of blue light in the B segment. . Although the utilization efficiency of the green light is somewhat lowered, the reflective surface may be formed only in the portion corresponding to the B segment of the wheel body 341.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications and applications are naturally possible within the scope of the gist of the present invention.
Further, the above-described embodiments include various stages of the invention, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some configuration requirements are deleted from all the configuration requirements shown in the embodiment, the above-described problem can be solved, and this configuration requirement is deleted when the above-described effects can be obtained. The configuration can also be extracted as an invention.

Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1] a blue light source that emits light in a blue wavelength band;
A rotatable main body having a reflecting surface formed on at least a part of the peripheral edge, and a peripheral edge of the main body having a right isosceles triangular cross section, and receives the light in the blue wavelength band and receives a green wavelength. A first segment formed with a first surface for emitting band light, a second surface for transmitting the blue wavelength band light to the reflecting surface, and the blue wavelength band light reflected by the reflecting surface. And a prism having a second segment formed with a third surface that emits light,
An optical system that guides each of the light in the green wavelength band emitted from the first segment and the light in the blue wavelength band emitted from the second segment to the same optical path;
A light source device comprising:
[2] The light source device according to [1], wherein a diffusion surface for diffusing the light in the blue wavelength band reflected by the reflection surface is formed on the third surface.
[3] The light source device according to [1] or [2], wherein a reflection surface that reflects the light in the green wavelength band is formed on the second surface.
[4] A first operation of rotating the wheel so that light in a blue wavelength band emitted from the blue light source enters the first segment, and light in a blue wavelength band emitted from the blue light source. Any one of [1] to [3], further comprising: a projection processing unit that executes, in a time division manner, a second operation of rotating the wheel so as to enter the second segment. The light source device according to item.
[5] A red light source that emits light in the red wavelength band is provided,
The optical system is configured to transmit, on the same optical path, each of the light in the blue wavelength band emitted from the first segment, the light in the green wavelength band emitted from the second segment, and the light in the red wavelength band. The light source device according to any one of [1] to [4], wherein the light source device is guided to:
[6] A light source device, a display element, a light source side optical system that guides light from the light source device to the display element, a projection optical system that projects an image emitted from the display element, the light source device, and a display Control means for controlling the element,
The light source device is the light source device according to any one of [1] to [5].

  DESCRIPTION OF SYMBOLS 10 ... Data projector apparatus, 11 ... Input part, 12 ... Image conversion part, 13 ... Projection process part, 14 ... Micromirror element, 15 ... Light source part, 16 ... Mirror, 17 ... Projection lens part, 18 ... CPU, 19 ... Main memory, 20: Program memory, 21: Operation unit, 22: Audio processing unit, 23: Speaker unit, 31 ... Blue light source, 32 ... Dichroic mirror, 33 ... Lens, 34 ... Wheel, 35 ... Lens, 36 ... Reflection mirror 37 ... lens, 38 ... red light source, 39 ... lens, 40 ... dichroic mirror, 41 ... light tunnel, 341 ... wheel body, 342 ... prism, 342a ... glass surface, 342b ... phosphor surface, 342c ... transmission diffusion surface, 343 …motor

Claims (6)

A blue light source that emits light in the blue wavelength band;
A rotatable main body having a reflecting surface formed on at least a part of the peripheral edge, and a slope formed on the peripheral edge of the main body so as to have a right-angled isosceles triangular cross-section so as to contact the main body And a first surface that transmits the light in the blue wavelength band to the reflection surface and a second surface that transmits and emits the light in the blue wavelength band reflected by the reflection surface. A wheel having a segment and an annular prism provided with a second segment formed with a third surface coated with a phosphor that receives light in the blue wavelength band and emits light in the green wavelength band ; ,
An optical system that guides each of the light in the blue wavelength band emitted from the first segment and the light in the green wavelength band emitted from the second segment to the same optical path;
Equipped with,
When the first segment is positioned on the optical axis of the blue light source by rotation, the glass surface as the first surface is orthogonal to the optical axis of the blue light source, and the first segment The transmission diffusion surface as the surface of 2 is formed so as to be located on the reflection optical axis of the reflection surface formed on the main body,
The second segment is formed so that the phosphor surface as the third surface is orthogonal to the optical axis of the blue light source when the second segment is positioned on the optical axis of the blue light source by rotation. a light source device characterized that you have been.   The light source device according to claim 1, wherein a diffusion surface for diffusing the light in the blue wavelength band reflected by the reflection surface is formed on the second surface.   The light source device according to claim 1, wherein a reflection surface that reflects the light in the green wavelength band is formed on the third surface.   A first operation of rotating the wheel so that light in a blue wavelength band emitted from the blue light source is incident on the first segment; and light in a blue wavelength band emitted from the blue light source is the second 4. The light source according to claim 1, further comprising a projection processing unit that executes, in a time division manner, a second operation of rotating the wheel so as to be incident on the segment. 5. apparatus. It has a red light source that emits light in the red wavelength band,
The optical system is configured to transmit, on the same optical path, each of the light in the blue wavelength band emitted from the first segment, the light in the green wavelength band emitted from the second segment, and the light in the red wavelength band. The light source device according to claim 1, wherein the light source device is guided to the light source. A light source device, a display element, a light source side optical system that guides light from the light source device to the display element, a projection optical system that projects an image emitted from the display element, and the light source device and the display element are controlled. Control means for
6. The projector device according to claim 1, wherein the light source device is the light source device according to any one of claims 1 to 5.

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