WO2011111158A1

WO2011111158A1 - Light source device and projection image display device

Info

Publication number: WO2011111158A1
Application number: PCT/JP2010/053839
Authority: WO
Inventors: 田中　健一; 青木　雅博; 創大歳; 田中　俊明
Original assignee: 株式会社日立製作所
Priority date: 2010-03-09
Filing date: 2010-03-09
Publication date: 2011-09-15

Abstract

Disclosed is a light source device which is provided with a plurality of laser light sources and has improved beam resolution. The light source device is provided with the plurality of laser light sources, and a conical trapezoidal rod integrator which is disposed such that the upper bottom surface is formed as a light incoming surface from which light emitted from the laser light sources enters and the lower bottom surface is formed as a light outgoing surface. The laser light sources are disposed such that the optical axes of the outgoing light, which is emitted from the laser light sources and enters the incoming surface of the rod integrator, form an angle (θ), i.e., an acute angle, with respect to the center axis of the rod integrator.

Description

Light source device and projection type image display device

The present invention relates to a light source device including a plurality of laser light sources and a projection-type image display device.

Conventional technology

One of the main uses of the light source device is a projection type image display device (hereinafter referred to as “projector”). In recent years, a light emitting device (Light Emitting Diode: LED) or a laser light source is used as the light source device, and a method of displaying an image by raster scanning (hereinafter referred to as “projector”) has attracted attention. The projector uses a light source of RGB three primary colors (red, blue, and green), projects the light emitted from each light source on a screen and superimposes them, and modulates the emitted light to form a color display image. Therefore, the three-color light source for projectors displays white when the beam positions of all colors overlap on the screen.

Patent Document 1 discloses a light source device and a projection type image display device using such a laser light source.

In Patent Document 1, a light emitting element 1 including wavelengths corresponding to three primary colors of red R, green G, and blue B is used as a light source, and emitted light from each RGB light emitting element 1 passes through a condenser lens system 3 to a rod integrator 4. A structure is disclosed in which the emitted light from each light emitting element 1 is radially arranged starting from a point on the incident surface of the condensing lens system 3 rod integrator 4 so as to be incident on the incident surface (Patent Document). 1 paragraph number 0032). It is described that the angle at which the emitted light (optical axis) from each light emitting element 1 enters the incident surface of the rod integrator is set to a maximum of 30 degrees (paragraph number 0037 in Patent Document 1). Further, it is described that the rod integrator 4 has a shape surrounded by four reflecting surfaces (paragraph number 0024 in Patent Document 1). Then, according to Embodiment 1 of Patent Document 1, it is possible to obtain an illumination light beam that is excellent in uniformity at the exit end face of the rod integrator 4 and has a shape substantially equal to a desired illumination area. (Patent Document 1, paragraph number 0041).

Japanese Unexamined Patent Publication No. 2007-114603

In Patent Document 1, the irradiated beam spot diameter was large and the luminance was low. That is, high luminance light resolution could not be realized. This is considered to be caused by the low parallelism of the collimated light.

An object of the present invention is to improve the resolution of a light source device using a plurality of light emitting elements.

The present application includes a plurality of means that can achieve the above-mentioned object. If representative means are given, they are the means described in the claims.

According to the present invention, the irradiation beam resolution of a light source device including a plurality of laser light sources can be improved.

FIG. 3 is a transmission configuration diagram of the light source device according to the first embodiment. It is a figure explaining that three lasers from the light source device of Example 1 enter into a rod integrator, and are irradiated to a screen as one beam light. FIG. 5 is a diagram showing a simulation result for a beam irradiated on a screen 1.5 m away from the rod integrator 11. FIG. 6 is a diagram showing a simulation result for a beam irradiated on a screen 2 m away from the rod integrator 11. In the light source device of Example 1, it is a figure which shows the result of having simulated the beam overlap condition of the RGB light source, when the emitted light from a rod integrator is irradiated on the screen 1.5m and 2.0m away. FIG. 6 is a diagram defining parameters relating to a relative position between the rod integrator 11 and the B light source 103. FIG. 6 is a diagram showing a parameter range related to the arrangement between the rod integrator 11 and the B light source 103. FIG. 6 is a diagram showing a parameter range related to the arrangement between the rod integrator 11 and the B light source 103. When the light source wavelength is 650 nm and 450 nm, it is a diagram showing the relationship between the angle α of the light beam incident on the rod integrator and the position of the light beam emitted from the light source device (evaluated by the amount of deviation from the optical axis). It is a figure which shows the outline of three types of rod integrator shapes classified roughly into type I, type II, and type III. It is a figure explaining the relationship between the light source position in the light source device which concerns on Example 5, and the size of the upper bottom face 11-1 which is the light introduction surface of a rod integrator. It is a figure explaining the mounting form and means of the several light source in the light source device which concerns on Example 6. FIG. It is a figure explaining the mounting form and means of the some light source in the light source device which concerns on Example 7. FIG. FIG. 10 is a transmission diagram of the light source device according to the eighth embodiment. 10 is a simplified cross-sectional view of a projection apparatus according to Embodiment 9. FIG. FIG. 11 is a simplified cross-sectional view of a projection apparatus according to Example 10.

Hereinafter, the configuration and operation of various embodiments will be specifically described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, the dimensional ratios in the drawings do not necessarily match those described.

First, the configuration of a light source device according to an embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a transmission configuration diagram of the light source device according to the first embodiment.

FIG. 2 (a) is a diagram for explaining that the light emitted from the light source device according to the first embodiment is irradiated on the screen as one beam light. FIG. 2B is a diagram illustrating that three laser beams are incident on the rod integrator in the light source device according to the first embodiment.

The light source device 800 includes a red laser as the R light source 101, a green laser as the G light source 102, a blue laser as the B light source 103, a rod integrator 11, and

lenses

12a, 12b, and 12c as optical elements.

The rod integrator 11 has, for example, a truncated cone shape having a circular upper surface having a first radius R1 = 0.15 mm and a circular lower surface having a second radius R2 = 0.5 mm (> R1). Therefore, the upper bottom surface and the lower bottom surface are parallel and have a central axis passing through the same center point, and the tapered side surface spreads uniformly or curved at a predetermined angle from the upper bottom surface to the lower bottom surface along the central axis. It has. The optical axis of the emitted light coincides with this central axis. Hereinafter, these are used equivalently.

Each

light source

101, 102, 103 is mounted on a pedestal on a pyramidal or pyramidal frustum-shaped can stem whose apex extends toward the vicinity of the center of the incident surface (upper bottom surface) of the rod integrator 11. In this embodiment, a triangular pyramid (pyramid type) is adopted. The rod integrator 11 is fixed to the housing 30 by a support holder 11-5. Similarly, the

lenses

12a, 12b, and 12c as optical elements are fixed to the housing 30 by a support holder.

As shown in FIGS. 1 and 2A, a plurality of light beams emitted from the firing points (emission surfaces) of the RGB

laser light sources

101, 102, and 103 are incident on the rod integrator 11 almost simultaneously.

As shown in FIG. 2B, the optical axes of the emitted light 101a from the R light source 101, the emitted light 102a from the G light source 102, and the emitted light 103a from the B light source 103 in FIG. The angles θR, θG, and θB formed with the central axis of the rod integrator 11 that is the central normal of 11-1 are all 23 °, and are incident on positions that are 0.09 mm away from the center of the rod integrator 11. Thus, the

light sources

101, 102, and 103 are arranged. These angles can be changed within a range described later.

The incident RGB three-color laser light repeatedly propagates multiple reflections in the rod integrator 11 and is emitted from the lower bottom surface of the rod integrator 11.

As a result of the light emitted from the rod integrator 11 being mixed in the rod integrator 11, not only becomes a beam having a wide light intensity half-value region, but also the directivity in the central axis direction of the rod integrator 11 is enhanced. After that, the emitted light from the rod integrator 11 becomes collimated light having a higher degree of parallelism by the lens 12a as an optical element, and then condensed by the lens 12b as an optical element, and then by the lens 12c as an optical element, The spot is converted again into collimated light (parallel light) having a small beam diameter, and is emitted to the outside.

Then, as shown in FIG. 2 (a), the beam light emitted from the light source device 800 to the outside is irradiated onto the screen 40a as one beam spot.

As described above, in the light source device of the first embodiment, the

outgoing lights

101a, 102a, and 103a from the RGB

light sources

101, 102, and 103 are applied to the upper bottom surface of the rod integrator 11 from the oblique direction inclined from the normal line of the incident surface. Incident light not only makes the optical axes of the

outgoing lights

101a, 102a, 103a of the RGB

light sources

101, 102, 103 substantially coincide, but also outputs collimated light with high directivity in the outgoing direction and high parallelism. Therefore, strict optical axis adjustment using a conventional dichroic mirror is not required, and high-resolution beam irradiation with high brightness and a small beam spot diameter is possible.

Next, the characteristics of the light source device of the first embodiment will be described quantitatively.

3 and 4 are diagrams showing the intensity distribution of the emitted light of each light source and the beam state (diameter) on the screen at the position where the central axis of the rod integrator 11 hits the screen in the light source device of the first embodiment. .

3 is a simulation result for a beam irradiated on a screen 1.5 m away from the rod integrator 11 and FIG. 4 is 2 m away from the rod integrator 11.

As shown in FIGS. 3A, 3C and 3E, the emitted light 101a from the red (R) light source 101, the emitted light 102a from the green (G) light source 102, and the emitted light 103a from the blue (B) light source 103 are shown. It can be seen that each of the optical axes is distributed around a position where the central axis of the rod integrator 11 hits the screen 1.5 m away. That is, it can be seen that the maximum beam output intensity is on the optical axis, and the collimated light has a high degree of parallelism. 3 (b), (d), and (f), the emitted light 101a from the R (red) light source 101, the emitted light 102a from the G (green) light source 102, and the emitted light from the B (blue) light source 103 are output. The width of each beam diameter at which the intensity value of each emitted light of the emitted light 103a becomes a half value is 1.8 mm, 1.5 mm, and 0.97 mm, respectively. From this result, when the light emitted from RGB light sources with different wavelengths is incident on the multiple axes at an angle with respect to the central axis of the top and bottom surfaces 11-1 of the rod integrator 11, all the light beams are 1.5m apart. Since the maximum intensity is obtained at the same position on the screen, the optical axes are substantially matched.

As shown in FIGS. 4 (a), 4 (c), and 4 (e), the screen of 2.0m away from the screen with the center axis of the rod integrator 11 being 2.0m away is the same as the case of the screen 1.5m away. It can be seen that the distribution is centered on the hit position.

4 (b) (d) (f), the emitted light 101a from the red (R) light source 101, the emitted light 102a from the green (G) light source 102, and the emitted light from the blue (B) light source 103, respectively. The widths of the beam diameters at which the intensity values of the emitted lights of the emitted light 103a are half values are 0.74 mm, 0.61 mm, and 0.51 mm, respectively. From this result, when light from RGB light sources with different wavelengths is incident on the plurality of light sources at an angle with respect to the central axis of the upper bottom surface 11-1 of the rod integrator 11, the light beams are all 2.0m apart. From the above, it can be seen that the optical axes substantially coincide with each other because the optical axis has the maximum intensity at the center.

FIG. 5 is a diagram showing a result of simulating the beam overlapping state of the RGB light source when the light emitted from the rod integrator is irradiated onto a screen 1.5 m and 2.0 m away from the light source device of the first embodiment. It is.

In the case of a screen 1.5 m away, the diameter of the region where the RGB three color beams overlap is 0.97 mm, and in the case of the screen 2.0 m away, the diameter of the region where the RGB color beams overlap is 0.51 mm. This is because the beam diameter is smaller than before and the luminance per unit area is considerably high.

Example 2 shows the allowable range of each parameter applied in Example 1.

FIG. 6 is a diagram defining parameters relating to the relative position between the rod integrator 11 and the B light source 103. Reference numeral 60 denotes a beam light introduction portion in the rod integrator, and reference numeral 61 denotes an intersection between the central axis of the rod integrator and the outgoing optical axis of the laser light source.

As shown in FIG. 6, the rod integrator 11 is arranged in the + Z direction, and the light input surface which is the upper bottom surface 11-1 of the rod integrator 11 is parallel to the XY plane. The emission surface of the B light source 103 is located at (Z, Y, Z) = (0,0,0).

Vectors

103b and 103c indicate the projection of the vector 103a of the light emitted from the laser light source onto the YZ plane and the projection onto the XZ plane, respectively. The projection vector 103c has an inclination of angle α, and the projection vector 100b has an inclination of angle β. The angle α has the same value as the angle θ of the first embodiment when the angle β is 0.

7 and 8 are diagrams showing parameter ranges relating to the arrangement between the rod integrator 11 and the B light source 103. FIG.

FIG. 7 shows the incident angles α and β between the B light source 103 and the rod integrator 11 of Example 2 and the deviation amount of the emitted light 103a from the central axis of the rod integrator 11.

FIGS. 7B and 7D show the angles α (see FIG. 7A) and β (see FIG. 7C) defined in FIG. 6 in the direction of the light emitted from the B light source, and the rod. The relationship of the maximum intensity position of the beam light emitted from the integrator 11 is shown.

FIG. 7 (b) shows the dependence of the position where the maximum intensity of the emitted light is the intensity (in the case where the optical axis is the origin on the origin) on the angle α (FIG. 7 (a)). Yes. The other parameters were set to angles β = 0, x = −0.08 mm, and y = 0 mm.

When the absolute value of the angle α is 20 degrees to 27 degrees, the deviation of the center of the optical axis is within 0.1 mm, and the maximum intensity position of the emitted light is almost the central axis of the rod integrator 11, that is, the pixels that overlap each RGB light source It shows that it is in the center. The optimum value (absolute value) is 21 to 25 degrees.

FIG. 7 (d) shows the dependence of the maximum intensity position of the emitted light on the angle β (FIG. 7 (c)) of the maximum intensity position of the emitted light (represented by the deviation from the origin position when the optical axis is the origin). The other parameters were an angle α = −22.5, x = −0.08 mm, and y = 0 mm.

If the angle β is between -2 degrees and +2 degrees, that is, within an absolute value of 2 degrees, the deviation variation of the optical axis center is within 0.1 mm, and the maximum intensity position of the emitted light is approximately the center of the rod integrator 11 The axis, that is, the pixel center where the RGB light sources overlap is shown. The optimum value is 0 degrees.

8 (b) and 8 (d) show the distances x (see FIG. 8 (a)) and y (see FIG. 8 (c)) defined in FIG. 6 and the rod integrator 11 in the direction of the light emitted from the light source. The relationship of the maximum intensity position of the beam light radiate | emitted from is shown.

FIG. 8 (b) shows the dependence of the maximum intensity position of the emitted light (in the case where the optical axis is the origin, the amount of deviation from the origin position) on the distance x (see FIG. 8 (a)). The other parameters were an angle α = −22.5, an angle β = 0, and y = 0 mm.

From FIG. 8 (b), it is preferable that the distance x shown in FIG. 8 (a) is in the range of -0.075mm to -0.085mm in order to make the deviation from the optical axis center within 0.1mm. Recognize. The optimum value is -0.08mm. That is, it can be seen that the maximum intensity position of the emitted light is preferably slightly shifted from the central axis of the rod integrator 11.

FIG. 8 (d) shows the dependence of the maximum intensity position of the emitted light on the distance y (see FIG. 8 (c)) of the maximum intensity position of the emitted light (represented by the amount of deviation from the origin position when the optical axis is the origin). The other parameters were an angle α = −22.5, an angle β = 0, and x = −0.08 mm.

FIG. 8D shows that when the distance y shown in FIG. 8C is 0 mm, that is, the origin, the maximum intensity position of the emitted light is on the optical axis.

The result of FIG. 8 (b) shows that the light beam emitted from the rod integrator is set as the optical axis by arranging the light source at the optimum position even when the emission end face of the input light to the rod integrator is not at the center of the optical axis. It shows that they can be matched.

FIG. 9 shows the relationship between the angle α of the beam light incident on the rod integrator and the position of the beam light emitted from the light source device (evaluated by the amount of deviation from the optical axis) when the light source wavelengths are 650 nm and 450 nm. Yes.

As can be seen from FIG. 9, when the light source wavelength is 450 nm, if −20 degrees ≧ α ≧ −27 degrees, the deviation from the optical axis is within 0.1, and if −21 degrees ≧ α ≧ −25 degrees. , Can be almost zero. Considering that light emitted from a plurality of light sources is input to the rod integrator, a mounting space must be secured. That is, a smaller absolute value of α is preferable. Therefore, when the light source wavelength is 450 nm, | α | = 21 degrees is the optimum angle for mounting.

As can be seen from FIG. 9, when the light source wavelength is 650 nm, the deviation from the optical axis is within 0.1 when −22 degrees ≧ α ≧ −25.5 degrees, and −22.5 degrees ≧ α ≧ −25 degrees. If there is, it can be almost zero. In consideration of inputting light emitted from a plurality of light sources to the rod integrator, a mounting space must be secured. That is, it is preferable that the absolute value of β is smaller. Therefore, when the light source wavelength is 650 nm, | β | = 22.5 degrees is the optimum angle for mounting.

Considering the above, when the wavelength of the laser light source input to the rod integrator is λR = 650 nm (red), λG = 530 nm (green), or λB = 450 nm (blue), the light source device emits light from each wavelength light source. It can be seen that αR> αG> αB is established when αR, αG, and αB are angles formed by the direction of the light beam and the optical axis.

Next, the shape of the rod integrator in the light source device will be described with reference to FIG.

FIG. 10 roughly shows the outline of three types of rod integrator shapes classified into type I, type II, and type III.

Type I shown in FIG. 10 is a rod integrator 11 comprising a taper type 11a in which the cross-sectional area of the lower bottom surface 11-2 that is the light exit surface is larger than the cross-sectional area of the upper bottom surface 11-1 that is the light incident surface. 11 is shown.

10 is a structure in which a straight type 11b is connected to an incident surface of a type I rod integrator (taper type 11a).

10 is a structure in which a straight type 11c is connected to the exit surface of a type II rod integrator (taper type 11a). However, the length of the straight mold 11c should not interfere with the effect of the taper mold 11a.

Here, what is common to Types I to III is that it has a truncated cone shape, and that the end surface on the upper bottom surface 11-1 side is the entrance surface and the end surface on the lower bottom surface 11-2 side is the exit surface. It is.

Next, the relationship between the light source position in the light source device according to the fifth embodiment and the size of the upper bottom surface 11-1 that is the light introduction surface of the rod integrator will be described with reference to FIG.

FIG. 11 shows the direction of the beam light emitted from the light source prepared for input to the rod integrator and the size of the upper bottom surface 11-1 that is the light introducing surface of the rod integrator at that time in the light source device according to the fifth embodiment. It is a figure explaining the relationship. At this time, the light beam is a light beam having a specific spread angle.

In FIG. 11, a light beam 100b having a divergence angle from a light source is an angle α and a direction from an emission position 100 (a distance s from the optical axis, a distance t from the upper bottom surface 11-1 that is the input surface of the rod integrator). Released at 100a. Further, at this time, the light beam 100b is a laser beam having a spread angle θ.

In FIG. 11, as a condition that all the light emitted from the laser light source 100 enters the rod integrator, assuming that the diameter of the upper bottom surface 11-1 that is the input surface of the rod integrator is L, the condition is as follows.

In FIG. 11, when the angle θ is larger than α (that is, θ ≧ α), L ≧ 2 × {t × tan (α + θ) −s}. When the angle θ is smaller than α (that is, θ <α), L ≧ 2 × {t × tan (2θ) −s}.

Next, a plurality of light source mounting forms and means in the light source device according to the sixth embodiment will be described with reference to FIG.

FIG. 12A is a schematic diagram showing the mounting form of a plurality of light sources, FIG. 12B is a schematic diagram showing the mounting form of the laser light source, and FIG. 12C is a diagram of the laser light source and the collimating lens holder. A schematic diagram showing the implementation is shown.

FIG. 12A shows a diagram in which a stage having a pyramid shape of laser light sources 101 (red), 102 (green), and 103 (blue) of RGB three primary colors is mounted on a can stem. By using such a stage, the introduction angle α of the laser beam to the rod integrator can be controlled by the tilt angle of the stage, so that adjustment becomes easy.

FIG. 12B is a schematic diagram showing a form in which the laser light source 200 is mounted on the laser light source mounting submount substrate 201.

FIG. 12C is a schematic diagram showing a form in which the laser light source mounting submount substrate 201 and the lens component 203 for collimating and condensing the light emitted from the laser light source 200 are mounted on the laser mounting mount substrate 202.

In this embodiment, the case of three laser light sources has been described. However, the above-described stage and cancel system can be applied to four or more laser light sources.

Next, a plurality of light source mounting forms and means in the light source device according to the seventh embodiment will be described with reference to FIG.

FIG. 13 (a) is a schematic view showing a mounting form of a plurality of light sources, and FIG. 13 (b) is a schematic view showing a mounting form of a wavelength conversion laser composed of a fundamental laser light source and a wavelength conversion element. .

The laser light sources 101 (red), 102 (green), and 103 (blue) of RGB three primary colors are mounted on a stage on a cantem that has a pyramid shape. By using such a stage, the introduction angle α of the laser beam to the rod integrator can be controlled by the tilt angle of the stage, so that adjustment becomes easy.

FIG. 13B is a schematic diagram showing a mounting form of the laser light source 102 (green).

A laser light source mounting submount substrate 201 on which the laser light source 200 is mounted,

lens components

204 and 205 for collimating and condensing the light emitted from the laser light source 200, and a wavelength conversion element 206 are mounted on the laser mounting mount substrate 202. ing.

The wavelength conversion element 206 uses a nonlinear crystal, the laser light source 200 uses the laser light source 102 that emits infrared light having a wavelength of 1060 nm, and wavelength conversion is performed by the wavelength conversion element 206, so that green light having a wavelength of 530 nm is emitted. Emitted.

The above-described stage and can stem can be applied to four or more laser light sources.

FIG. 14 shows a transmission diagram of the light source device of Example 8.

The rod integrator 11 and the

lenses

12a, 12b, and 12c are in the transmission type housing (can stem) 30a, and the pyramid stage 40 is on the housing 30a. 50 is retained and built-in.

By setting the taper angle of the pyramid-type stage 40 to a predetermined angle with respect to the central axis (emitted optical axis) of the rod integrator 11, a predetermined angle with respect to the incident surface of the rod integrator 11 can be obtained by simply mounting the edge emitting laser on a plane. This makes it easy to mount a laser light source incident on.

Note that the rod integrator 11 that emits the beam light serving as the collimated light is any one of the seventh embodiment.

FIG. 15 is a simplified cross-sectional view of the projection apparatus according to the ninth embodiment.

The projection apparatus 900 of this embodiment includes a light source device 800, a beam scanning unit 901, and a housing with an extraction port 902.

By using a laser light source of RGB three primary colors as a light source constituting the light source device 800, the collimated beam light emitted from the light source device 800 is raster scanned by the beam scanning unit 901 and projected from the extraction port 902. Thus, an image projection apparatus that projects an image on the screen 909 in a color display can be realized. The beam scanning unit 901 uses a raster scan type method using a MEMS (Micro Electro Mechanical Systems) mirror.

Further, when the light source constituting the light source device 800 is a laser light source that irradiates ultraviolet light having a wavelength near 250 nm, the collimated beam light emitted from the light source device 800 is subjected to raster scanning in the beam scanning unit 901. Thus, a sterilization apparatus that can sterilize adherent bacteria in a desired region (such as a wall) as in a bioclean room can be realized.

FIG. 16 is a simplified cross-sectional view of the projection apparatus according to the tenth embodiment.

The projection apparatus according to this embodiment includes a light source device 800, a spatial modulator 903, and a beam magnifying lens 904.

Although Example 1 is used as the light source device 800, in application, the refractive indexes of the

lenses

12a, 12b, and 12c of the light source device 800 are adjusted so that the beam light emitted from the light source gradually becomes a beam light that expands. It is.

Spatial modulator 903 is composed of a liquid crystal display module.

The RGB primary color laser light emitted from the light source that constitutes the light source device 800 can realize a color image projection device that projects an image in color display on the screen 909 by the spatial modulator 903 and the beam magnifying lens 904. .

Further, when the light source constituting the light source device 800 is a laser light source that emits ultraviolet light having a wavelength of about 250 nm, the collimated beam light emitted from the light source device 800 is modulated by the spatial modulator 903. A sterilization apparatus that can sterilize adherent bacteria in a desired region (such as a wall) with a predetermined strength, such as a bioclean room, can be realized.

<Modification>
It is a preferable aspect of the present invention that the plurality of laser light sources used in Examples 1 to 7 are laser light sources having the same wavelength. With this configuration, one beam light that is overlapped and mixed can be changed from low output power to high output power by the tapered rod integrator.

The laser light source used in the above embodiments is either a semiconductor laser that oscillates in a single mode, a wavelength conversion laser light source that consists of a nonlinear crystal as a wavelength conversion element, or a semiconductor laser light source that oscillates in a single mode.

The “optical element” used in this specification refers to an element that gives some optical action (for example, reflection, transmission, refraction, diffraction, etc.) to incident light, such as a lens or a diffraction grating. It is a concept that includes

The rod integrator includes any of an optical fiber, a liquid fiber, a light guide plate, a light tunnel, and a light pipe.

800 ... light source device, 101 ... R light source, 102 ... G light source, 103 ... B light source, 11 ... rod integrator, 12a, 12b, 12c ... lens as optical element, 11-5 ... support holder, 101a ... from R

light source

101 , 102a: emitted light from the G

light source

102, 103a: emitted light from the B light source 103, 11-1: upper bottom surface of the rod integrator 11, 11-2: lower bottom surface of the

rod integrator

11, 40a: screen, 60: Beam light introduction point in the rod integrator, 61: Intersection of the central axis of the rod integrator and the output optical axis of the laser light source, 11a: Tapered type, 11b: Straight type, 11c: Straight type, 100b: Beam light, 100 ... Emission position, s ... Distance from optical axis, t ... Distance from rod integrator input port, α ... Angle, 100a ... Direction, θ ... Angle, 200 ... Laser light source, 201 ... Laser light source mounted submount substrate, 202 ... Laser light source mounting, 203 ... Laser light source Lens components for collimating and condensing 00 output light, 204... Lens components for collimating and condensing output light of the

laser light source

200, 205. Collimating and condensing output light of the laser light source 200 Lens parts, 206 ... wavelength conversion element, 30a ... housing (can stem), 40 ... stage, 900 ... projection device, 901 ... beam scanning section, 902 ... take-out port, 909 ... screen, 903 ... spatial modulator, 904 ... beam Magnifying lens

Claims

A plurality of laser light sources;
A rod integrator having a conical trapezoidal shape at least partially disposed on an upper surface on an incident surface on which light emitted from the laser light source enters, and on a lower surface on the lower surface;
The laser light source is arranged such that an optical axis of outgoing light incident on an incident surface of the rod integrator from the plurality of laser light sources forms an acute angle θ with respect to a central axis of the rod integrator. A light source device.
In claim 1,
The plurality of laser light sources comprises n light sources of different wavelengths;
When the wavelength λ satisfies the relationship of λ1>λ2>λ3>.
A light source device having an angle θ1>θ2>θ3>.
(Λn: wavelength of the nth laser light source, θn: the angle θ formed by the optical axis of the emitted light of the nth laser light source)
In claim 1,
The light source device according to claim 1, wherein the plurality of laser light sources include light sources having the same wavelength.
In claim 1,
The laser light source is one of a laser light source that oscillates in a single mode and a wavelength conversion laser light source that includes a laser light source that oscillates in a single mode and a wavelength conversion element.
In claim 1,
The light source device, wherein the laser light source and the rod integrator are modularized in one package, and the module is mounted on a can stem.
In claim 1,
A can stem having a pedestal having a tapered surface;
The laser light source is mounted on a taper surface of the pedestal so that the rod integrator and the laser light source form the angle θ.
In claim 1,
The rod integrator includes any one of an optical fiber, a liquid fiber, a light guide plate, a light tunnel, and a light pipe.
A projection-type image display device that projects while scanning laser light emitted from a laser light source device,
The laser light source device
A plurality of laser light sources;
A rod integrator having a conical trapezoidal shape at least partially disposed on an upper surface on an incident surface on which light emitted from the laser light source enters, and on a lower surface on the lower surface;
The laser light source is arranged such that an optical axis of outgoing light incident on an incident surface of the rod integrator from the plurality of laser light sources forms an acute angle θ with respect to a central axis of the rod integrator. Projection type image display device.
In claim 8,
The plurality of laser light sources comprises n light sources of different wavelengths;
When the wavelength λ satisfies the relationship of λ1>λ2>λ3>.
An angle θ1>θ2>θ3>...> Θn.
(Λn: wavelength of the nth laser light source, θn: the angle θ formed by the optical axis of the emitted light of the nth laser light source)
In claim 8,
The plurality of laser light sources include a light source having the same wavelength.
In claim 8,
The projection type image display device, wherein the laser light source is any one of a laser light source that oscillates in a single mode and a wavelength conversion laser light source that includes a laser light source that oscillates in a single mode and a wavelength conversion element.
In claim 8,
The laser light source and the rod integrator are modularized in one package,
A projection-type image display device, wherein the module is mounted on a can stem.
In claim 8,
With a pedestal having a tapered surface,
The laser light source is mounted on the tapered surface,
A projection type image display device, wherein the rod integrator and the laser light source are arranged so as to form the angle θ.
In claim 8,
The rod integrator includes any one of an optical fiber, a liquid fiber, a light guide plate, a light tunnel, and a light pipe.