CN107436526B

CN107436526B - Light source device and projection display device

Info

Publication number: CN107436526B
Application number: CN201710060013.1A
Authority: CN
Inventors: 山影明广
Original assignee: Sonnoc Inc
Current assignee: Sonoc (Beijing) Technology Co.,Ltd.
Priority date: 2016-08-26
Filing date: 2017-01-24
Publication date: 2020-04-17
Anticipated expiration: 2037-01-24
Also published as: CN107436526A; JP2018031995A

Abstract

The present invention relates to a light source device and a projection display device. Since a light source of a system in which the output light of the semiconductor laser is condensed, irradiated to the phosphor, and excited to emit light from the phosphor has a large volume, the projection display device is increased in size. The invention adopts an optical system which refracts and compresses the parallel light with short wavelength by a wedge prism and then condenses the parallel light by a condensing lens group to irradiate a phosphor, thereby realizing a very small light source device. The projection display device can be miniaturized by using the light source device.

Description

Light source device and projection display device

Technical Field

The present invention relates to a light source device including a semiconductor laser and a phosphor, and a projection display device using the light source device.

Background

In recent years, semiconductor lasers have been developed which output light having a short wavelength with high emission efficiency. It has been proposed to excite a phosphor with the output light of such a semiconductor laser and use the wavelength-converted light as a light source of a projection display device.

Patent document 1 describes a projection display apparatus in which output light from two-dimensionally arranged semiconductor lasers is condensed by a large-diameter lens group onto a fluorescent color wheel, fluorescence emitted from the fluorescent color wheel that has been excited is subjected to light color selection by a color filter, and the selected light is modulated by a spatial light modulation Device such as a Digital Micromirror Device (DMD).

Patent document 2 describes a light source device and a projection display device in which output light from a two-dimensionally arranged semiconductor laser is condensed by a plurality of mirrors and a condenser lens group to a phosphor to excite the phosphor.

Patent document 3 describes a light collecting member for exciting a fiber laser, which is not a projection display device, and which causes output light of a semiconductor laser to enter a prism, to be totally reflected by an inner surface of the prism, and then to exit the prism.

Patent document 1: japanese patent laid-open No. 2014-160227

Patent document 2: japanese patent laid-open No. 2012-195064

Patent document 3: japanese patent laid-open No. 2008-28019

In a projection display device in which a phosphor is excited by output light of a semiconductor laser as described in patent document 1, it is necessary to use a plurality of semiconductor lasers in order to increase the intensity of excitation light.

Therefore, although the intensity of the excitation light is secured by using the excitation light sources in which the semiconductor lasers are two-dimensionally arranged, the semiconductor lasers have a limitation in arrangement density when the semiconductor lasers are arranged because the semiconductor lasers are unstable in operation and the light emission efficiency is reduced when a high temperature is generated due to heat generation during operation.

For this reason, when a plurality of semiconductor lasers are to be used, the area occupied by the excitation light source increases, and the optical system for condensing the excitation light also occupies a large space, resulting in an increase in the volume of the projection display device.

For example, in the device described in patent document 1, it is necessary to use a large-diameter condensing lens group capable of covering an area occupied by two-dimensionally arranged excitation light sources.

In the device described in patent document 2, the output light of the two-dimensionally arranged semiconductor laser is condensed to the phosphor by the plurality of mirrors and the condenser lens group, and a large and complicated support structure is required for precisely arranging the plurality of mirrors, which makes the projection display device bulky and inconvenient to use.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a light source device in which output light from two-dimensionally arrayed semiconductor lasers is condensed and excited by a very small optical system to a phosphor, and a small projection display device including the light source device.

The present invention is a light source device, including: two light emitting device arrays in which a plurality of blue laser light sources are arranged in an array; a plurality of collimator lenses provided corresponding to the respective blue laser light sources; two wedge prisms, which receive the parallel light emitted from the collimating lens, refract the received parallel light and emit the parallel light as compressed parallel light; and a light-condensing unit that condenses the parallel light emitted from the two wedge prisms and irradiates the condensed light to a phosphor, wherein the two light-emitting device arrays are symmetrically arranged with a center line of the light-condensing unit interposed therebetween, and the two wedge prisms are symmetrically arranged with apex angles of wedges facing each other with the center line of the light-condensing unit interposed therebetween; alternatively, the two wedge prisms are asymmetrically arranged with the apex angle of the wedge shape facing each other with the center line of the light collecting unit interposed therebetween, and the two light emitting device arrays are asymmetrically arranged with the center line of the light collecting unit interposed therebetween.

Further, the present invention is a projection display device including: a light source device; a light color selection unit; a reflective light modulation device or a transmissive light modulation device; and a projection lens. The light source device includes: two light emitting device arrays in which a plurality of blue laser light sources are arranged in an array; a plurality of collimator lenses provided corresponding to the respective blue laser light sources; two wedge prisms, which receive the parallel light emitted from the collimating lens, refract the received parallel light and emit the parallel light as compressed parallel light; and a light-condensing unit that condenses the parallel light emitted from the two wedge prisms and irradiates the condensed light to a phosphor, wherein the two light-emitting device arrays are symmetrically arranged with a center line of the light-condensing unit interposed therebetween, and the two wedge prisms are symmetrically arranged with apex angles of wedges facing each other with the center line of the light-condensing unit interposed therebetween; alternatively, the two wedge prisms are asymmetrically arranged with the apex angle of the wedge shape facing each other with the center line of the light collecting unit interposed therebetween, and the two light emitting device arrays are asymmetrically arranged with the center line of the light collecting unit interposed therebetween.

According to the present invention, it is possible to provide a light source device in which output light of two-dimensionally arranged semiconductor lasers is condensed to a phosphor by a very small optical system and excited. Further, a small projection display device including the light source device can be provided.

Drawings

Fig. 1 is a schematic configuration diagram of a projection display device according to a first embodiment.

Fig. 2 is a schematic structural diagram of the light source device.

Fig. 3 (a) is a plan view of the light source module, fig. 3 (b) is a side view of the light source module, and fig. 3 (c) is a side view of the light source module in another direction.

Fig. 4 (a) shows an example of the arrangement of the light source module, (b) of fig. 4 shows another example of the arrangement of the light source module, and (c) of fig. 4 shows another example of the arrangement of the light source module.

Fig. 5 is a schematic structural diagram of the light source device.

Fig. 6 is a schematic configuration diagram of a projection display device according to a second embodiment.

Fig. 7 is a schematic view of another structure of the light source device.

Fig. 8 is a schematic view of another structure of the light source device.

Fig. 9 is a schematic view of another structure of the light source device.

Fig. 10 is a schematic view of another structure of the light source device.

Fig. 11 is a schematic diagram of another configuration of the light source device and a schematic configuration of the projection display device.

Description of the symbols

1 … light source device

11 … light source assembly

12 … light source assembly

13 … wedge prism

14 … wedge prism

15 … condenser lens group

16 … plate-shaped rotating body with phosphor

31 … module substrate

32 … laser light source

33 … collimating lens

130 … color selection color wheel

160 … light modulation device

180 … projection lens

190 … projection screen

670 … Cross dichroic prism

682 … transmissive liquid crystal panel for red (R)

684 … transmissive liquid crystal panel for green (G)

686 … transmissive liquid crystal panel for blue (B)

690 … projection lens

115 … parabolic reflector

116 … retroreflector

911 … dichroic mirror

914 … dichroic mirror

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

[ first embodiment ]

Fig. 1 shows a schematic configuration of a light source device and a projection display device including the light source device according to a first embodiment of the present invention.

(device construction)

As shown in fig. 1, the projection display device according to the first embodiment includes a light source device 1, a relay lens group 120, a light color selection color wheel 130, a light tunnel 140, an illumination lens group 150, a light modulation device 160, a prism 171, a prism 172, and a projection lens 180. There may be a case where the projection screen 190 is further provided.

The light source device 1 includes a light source unit 11, a light source unit 12, a wedge prism 13, a wedge prism 14, a condenser lens group 15, and a plate-like rotating body 16 having a phosphor. The light source device 1 will be described in detail later.

The relay lens group 120 is a lens group for guiding the light emitted from the light source device 1 to the light color selection color wheel 130 and then condensing the light to the entrance port of the light tunnel 140, and is composed of a single lens or a plurality of lenses.

The illumination lens group 150 is a lens group that shapes light propagating through the light channel 140 into a light beam suitable for illuminating the light modulation device, and is composed of a single or a plurality of lenses.

The prism 171 and the prism 172 together constitute a Total Internal Reflection (TIR) prism. The TIR prism totally internally reflects the illumination light to enter the optical modulator at a predetermined angle, and transmits the reflected light modulated by the optical modulator toward the projection lens 180.

The optical modulation device 160 is a device for modulating incident light based on an image signal, and uses a DMD in which micromirror devices are arranged in an array. Other reflective light modulation devices, such as reflective liquid crystal devices, may be used.

The projection lens 180 is a lens for projecting light modulated by the light modulation device as an image, and is composed of a single or a plurality of lenses.

The projection screen 190 is used when constituting a rear projection type display device, and is often installed also in a front projection type display device, but is not necessarily provided when a user projects a picture onto an arbitrary wall surface or the like.

(light source device)

The light source device 1 will be described in detail below.

Fig. 2 is a view showing the light source device 1 of the projection display device of fig. 1, taken out, and includes a light source unit 11, a light source unit 12, a wedge prism 13, a wedge prism 14, a condenser lens group 15, and a plate-like rotating body 16 having a phosphor.

In fig. 2, C is a center line of the condenser lens group 15. The

light source units

11 and 12 are arranged symmetrically with respect to the center line C of the condenser lens group. Similarly, the

wedge prisms

13 and 14 are also arranged symmetrically with respect to the center line C of the condenser lens group.

First, the light source module will be described. Each of light source unit 11 and light source unit 12 includes: a plurality of blue laser light sources arranged in an array; and a plurality of collimating lenses arranged corresponding to the respective blue laser light sources, the blue laser light sources and the collimating lenses being modularized. The blue laser light source used in the light source module is a semiconductor laser that emits blue light.

To explain the internal structure of the light source module 11 and the light source module 12, fig. 3 (a) shows a plan view, and fig. 3 (b) and 3 (c) show side views from different directions.

As shown in fig. 3 (b) and 3 (c) which are side views, the module substrate 31, the plurality of blue laser light sources 32, and the plurality of collimator lenses 33 are integrated into a module 300.

As shown in the plan view of fig. 3 (a), one module 300 includes a light emitting device array in which blue laser light sources 32 are arranged in a matrix of 2 × 4. However, the size of the matrix arrangement included in one module is not limited to this example, and may be a larger-size matrix arrangement or a matrix arrangement in which the number of vertical and horizontal directions is the same.

The light output from each laser light source 32 is emitted from the light source unit as substantially parallel light rays by the action of the collimator lens 33.

Further, one light source unit may be constituted by one module, but in order to secure a required amount of light, one light source unit may be constituted by a plurality of modules.

For example, as shown in fig. 4 (a), a plurality of modules 300 may be arranged in a horizontal direction, or as shown in fig. 4 (b) or 4 (c), a plurality of modules 300 may be arranged in a combination of a horizontal direction and a vertical direction.

Next, a description will be given of what can be referred to as a feature of the present invention, that is, a portion where substantially parallel light rays emitted from a light source module are compressed by a wedge prism as a refractive optical system and guided to a condenser lens group.

Fig. 5 is a schematic diagram of the arrangement of the light source assembly 11, the light source assembly 12, the wedge prism 13, the wedge prism 14, and the condenser lens group 15.

As described above, the

light source modules

wedge prisms

13 and 14 are also arranged symmetrically with respect to the center line C of the condenser lens group 15.

The

light source modules

11 and 12 are arranged such that parallel rays of light emitted from the light source modules form an angle of α with respect to the center line C of the condenser lens group, α is referred to as the tilt angle of the incident rays of the prism.

The

wedge prisms

13 and 14 each have a light incident surface s (in) and a light emitting surface s (out), and the apex angle formed by these surfaces is set to β, β is referred to as the apex angle of the wedge prism.

The wedge prism 13 is positioned so that parallel light rays emitted from the light source unit 11 enter the light entrance surface s (in) substantially perpendicularly, and the parallel light rays entering the prism are refracted at the light exit surface s (out) and emitted in parallel with the center line C of the condenser lens group.

Similarly, the wedge prism 14 is positioned so that the parallel light rays emitted from the light source unit 12 enter the light incident surface s (in) substantially perpendicularly, and the parallel light rays entering the prism are refracted at the light emitting surface s (out) and emitted in parallel with the center line C of the condenser lens group 15.

When the optical path width of the substantially parallel light rays emitted from the light source unit is defined as a and the optical path width of the substantially parallel light rays emitted from the wedge prism is defined as B, a > B can be achieved according to the present invention. Here, assuming that B/a is the compression ratio CR, the smaller CR is than 1, the smaller the size of the condenser lens group 15 can be. According to the present invention, parallel light incident on the wedge prism is emitted by refraction and compressed, and thus the small compression ratio CR can be realized with a very small optical system.

For example, when a semiconductor laser that emits blue light is used as the laser light source, a glass material BK7 that has high transmittance of blue light and is inexpensive is suitably used as the material of the wedge prism. The refractive index of BK7 for light having a wavelength of 450nm is 1.526.

The angle of apex β of the wedge prism is 38.01 degrees, and parallel light from the light source unit is made to enter the light entrance surface s (in) perpendicularly at an incident angle of 0 degree, and light entering the wedge prism is made to enter the light exit surface s (out) at an incident angle of 38.01 degrees, and is refracted at the interface with the atmosphere and exits from the wedge prism as light parallel to the center line C of the condenser lens group 15, and the compressibility CR is 0.434, i.e., 43%.

Of course, according to the present invention, the specific conditions for achieving a compression ratio of less than 1 are not limited to the above-described examples. However, in order to emit light by refraction, it is necessary to prevent total reflection of light entering the wedge prism at the interface between the light emitting surface s (out) and the atmosphere.

In the first embodiment in which the light incident surface s (in) is perpendicularly incident at an incident angle of 0 degrees, the condition that the total emission occurs at the light emitting surface s (out) is given by the following equation (1).

θMax＝ARCSIN(1/n)...(1)

In equation (1), θ Max is an angle at which light entering the prism is totally reflected by the light exit surface s (out), and n is a refractive index of the prism material with respect to the wavelength used.

When the refractive index for light having a wavelength of 450nm, that is, n, which is calculated using the BK7 glass material, is 1.526, the total reflection angle θ Max is 40.943 degrees.

Examples of combinations of compression ratio CR, inclination angle α, and vertex angle β that can be achieved by a prism having a refractive index n of 1.526, within a range not exceeding this limit, are shown in table 1.

[ TABLE 1 ]

Inclination angle α	Top corner β	Compressibility CR (%)
			48	40.94	2
46	40.87	7
			44	40.73	12
42	40.52	17
			40	40.22	22
38	39.83	27
			37.0	39.61	30
36	39.35	33
			35	39.06	35
34	38.74	38
			32	38.01	43
30	37.15	49
			28	36.12	54
26	34.94	59
			24	33.59	64
21.8	31.85	70
			20	30.25	74

For example, the inclination angle α formed by the parallel light emitted from the collimator lens and incident on the wedge prism with respect to the center line of the condenser lens group is preferably 20 degrees or more and 48 degrees or less.

As for the compression ratio CR, high compression may be performed until the compression ratio CR is 2%. However, if the compression ratio is reduced, the total reflection condition obtained above is approached, and therefore, it should be noted that the characteristics of the light source and the prism are sensitively changed even if the arrangement of the light source and the prism is slightly inaccurate.

Although not shown in table 1, a light source device having a compressibility of more than 74% can be realized, and if the compressibility is close to 100%, the contribution to the purpose of downsizing the device is reduced.

Therefore, if practical reliability and miniaturization advantages are taken into consideration, 30% or more and 70% or less are ideal ranges with respect to the compression ratio CR.

Alternatively, the apex angle β of the wedge prism is preferably 31 degrees or more and 40 degrees or less.

As described above, the parallel light output from the light source module is compressed by the wedge prism and enters the condenser lens group 15 as compressed parallel light. Therefore, the diameter of the condenser lens group can be reduced.

The condenser lens group 15 condenses incident light to a plate-like rotating body 16 having a phosphor.

In the present embodiment, as shown in fig. 2, a plate-shaped rotating body having a fluorescent material and rotatable about a rotation axis Ap is used as the fluorescent material.

The reason why the rotatable plate-like rotating body is used is to move the irradiated region so that the phosphor is irradiated with the excitation light of high intensity condensed with the blue laser light, but the phosphor is not continuously irradiated with the fixed point and suffers from burn deterioration.

As the phosphor material, a material capable of emitting yellow light containing a red component and a green component by irradiation with blue excitation light is used. For example, a YAG series phosphor material (Y, Gd)₃(Al,Ga)₅O₁₂:Ce。

Further, a region which does not include a phosphor and which allows blue light to pass directly is provided in a part of the plate-like rotating body. Therefore, when the plate-like rotating body is rotated, yellow light and blue light are alternately emitted.

As described above, in the present embodiment, a system is employed in which parallel light having a short wavelength is refracted by a wedge prism, compressed, and then passed through a small condenser lens group to excite a phosphor, thereby realizing a very small light source device.

(operation of projection display device)

Next, referring back to fig. 1, the overall operation of the projection display device will be described.

The light emitted from the plate-like rotating body 16 having the fluorescent material passes through the relay lens group 120 and is guided to the light color selection color wheel 130.

The light color selection color wheel 130 is a plate-shaped rotating body that can rotate about a rotation axis Ac, and filters of red, green, and blue (RGB) colors are arranged in a sector shape. However, if the purity of the incident blue light is high, a fan-shaped notch (light transmission section) may be provided without providing a blue (B) filter.

The plate-shaped rotating body 16 having the fluorescent material and the light color selection color wheel 130 rotate in synchronization, and when yellow light is emitted from the plate-shaped rotating body 16, red light passes through the light color selection color wheel 130 while a red (R) filter is disposed; a green (G) filter sheet is disposed while yellow light is emitted from the former, and green light passes through the light color selection color wheel 130; when blue light is emitted from the former, the blue light passes through the light color selection color wheel 130 while the blue filter is disposed.

The light transmitted through the light color selection color wheel 130 is incident to the prism as a TIR prism through the light passage 140 and the illumination lens group 150. The light reflected by the total reflection surface of the prism 171 enters the light modulation device 160 at a predetermined angle.

The light modulator 160 includes micromirror devices arranged in an array, and drives each micromirror device in accordance with an image signal to reflect image light toward the prism 171 at a predetermined angle. The image light is transmitted through the prism 171 and the prism 172, guided to the projection lens, and projected onto the projection screen 190.

In the projection display device described above as the first embodiment, the light source device of the present invention in which parallel light is refracted and compressed by the wedge prism is suitably used as a small-sized light source device, and the projection display device can be downsized.

[ second embodiment ]

In the first embodiment, the reflective light modulation device 160 is used, and in the second embodiment, the transmissive light modulation device is used.

Fig. 6 is a schematic configuration diagram of a projection display device according to a second embodiment of the present invention.

(device construction)

As shown in fig. 6, the projection display device of the second embodiment includes: a light source device 1; a relay lens group 610; a first lens array 620; a second lens array 630; a polarization conversion device 640; a superimposing lens 650; dichroic mirrors 660, 661; mirrors 662, 663, 664; a cross dichroic prism 670; a lens 681 for red (R); a red transmissive liquid crystal panel 682; lens 683 for green (G); a transmissive liquid crystal panel 684 for green; lens 685 for blue (B); a transmissive liquid crystal panel 686 for blue; and a projection lens 690. There may be a case where the projection screen 691 is further provided.

The light source device 1 is substantially the same as the first embodiment. That is, the parallel light emitted from the

light source units

11 and 12 is compressed by the

wedge prisms

13 and 14 and enters the condenser lens group 15 as parallel light. The condenser lens group 15 condenses incident light to a plate-like rotating body 16 having a phosphor.

The light emitted from the light source device 1 is guided to the first lens array 620 through the relay lens group 610. The first lens array 620 includes a plurality of small lenses arranged in a matrix to divide light into a plurality of sub-beams. The second lens array 630 and the superimposing lens 650 form images of the small lenses of the first lens array 620 in the vicinity of the screen regions of the red, green, and blue transmissive

liquid crystal panels

682, 684, and 686. The first lens array 620, the second lens array 630, and the superimposing lens 650 make the light intensity of the light source device 1 uniform in the in-plane direction of the transmissive liquid crystal panel.

The polarization conversion device 640 converts the sub-beams divided by the first lens array 620 into linearly polarized light.

The dichroic mirror 660 is a dichroic mirror that reflects red light and transmits green light and blue light. Dichroic mirror 661 reflects green light and transmits blue light.

The

mirrors

662 and 663 are mirrors that reflect blue light. The reflecting mirror 664 reflects red light.

The linearly polarized red light enters the red transmissive liquid crystal panel 682 through the red lens 681, is modulated according to an image signal, and is emitted as image light. Further, an incident-side polarizing plate (not shown) and an exit-side polarizing plate (not shown) are disposed between the red lens 681 and the red transmissive liquid crystal panel 682, and between the red transmissive liquid crystal panel 682 and the cross dichroic prism 670, respectively.

Similarly to the red light, the green light is modulated by the transmissive liquid crystal panel 684 for green, and the blue light is modulated by the transmissive liquid crystal panel 686 for blue, and is emitted as image light.

The cross dichroic prism 670 is formed by bonding four rectangular prisms, and a dielectric multilayer film is formed on the X-shaped interface of the bonded portion.

The image light output from the red transmissive liquid crystal panel 682 and the blue transmissive liquid crystal panel 686 is reflected by the dielectric multilayer film toward the projection lens 690, and the image light output from the green transmissive liquid crystal panel 684 is transmitted through the dielectric multilayer film toward the projection lens 690.

The image lights of the respective colors are superimposed and projected onto a projection screen 691 through a projection lens 690.

In the projection display device according to the second embodiment described above, the light source device of the present invention in which parallel light is refracted and compressed by the wedge prism is also suitable for use as a small-sized light source device, and the projection display device can be downsized.

[ other embodiments of the light source device ]

In the first and second embodiments, the light source device is exemplified in which the parallel light rays emitted from the light source unit 11 are incident substantially perpendicularly on the light incident surface s (in) of the wedge prism 13, but the embodiment of the present invention is not limited to this.

For example, as shown in fig. 7, the main planes of the

light source modules

11 and 12 may not be parallel to the light incident surfaces s (in) of the

wedge prisms

13 and 14. Even if the incident angle of the parallel light incident from the light source unit to the light incident surface s (in) of the wedge prism is in an oblique direction within 5 degrees from the vertical direction, the parallel light can be compressed by refraction and emitted as in the above-described embodiments.

In the first and second embodiments, the example in which two wedge prisms are disposed symmetrically with respect to the center line C of the condenser lens group is shown as the light source device, but the embodiment of the present invention is not limited to this.

For example, as shown in fig. 8, the system may be asymmetrical with respect to the center line C of the condenser lens group. In fig. 8, the light source module 81 and the wedge prism 83, and the light source module 82 and the wedge prism 84 are paired, respectively. The light source unit 81 and the wedge prism 83 share a region extending across the center line C of the condenser lens group, and emit parallel light to the condenser lens group 15.

In the example of fig. 8, two wedge prisms are responsible for the region not less than the center line C of the condenser lens group, but three or more wedge prisms may be used. Instead of the wedge prisms 14 in the region below the center line C, a plurality of wedge prisms may be used.

Further, as shown in fig. 9, the system may be asymmetrical with respect to the center line C of the condenser lens group. In fig. 9, the vertex angle of the wedge prism 92 above the center line C of the condenser lens group is made larger than the vertex angle of the wedge prism 14 below, so that the compression ratio above is larger than that below.

In the above-described embodiments, the condenser lens group is used as the condensing means for condensing the light emitted from the wedge prism onto the phosphor, but the embodiments of the present invention are not limited to this.

As shown in fig. 10, a parabolic mirror 115 may be used instead of the condenser lens group. The phosphor is disposed at the focal point of the parabolic mirror 115. In the light source device of fig. 10, the size of the light source device is further reduced by providing the folding mirror 116 and disposing the fluorescent material at the focal position via the folding mirror.

In the above embodiment, the translucent plate-like rotating body is provided with the phosphor, and the yellow light wavelength-converted by the phosphor is transmitted through the plate-like rotating body and emitted, but the present invention is not limited thereto.

For example, a projection display device including the light source device 1 shown in fig. 11 may be used.

In the projection display apparatus shown in fig. 11, the relay lens group 120, the light color selection color wheel 130, the light tunnel 140, the illumination lens group 150, the light modulation device 160, the prism 171, the prism 172, the projection lens 180, and the projection screen 190 are the same as those of the projection display apparatus of the first embodiment.

In fig. 11, the light source device 1 includes: a light source assembly 11; a light source assembly 12; a wedge prism 13; a wedge prism 14; a condenser lens group 15; a dichroic mirror 911 that reflects yellow light and transmits blue light; a mirror 912 that reflects yellow light; a mirror 913 that reflects yellow light; a dichroic mirror 914 that reflects yellow light and transmits blue light; a lens group 915; a lens group 916; a lens group 917; a plate-like rotating body 918 having a fluorescent material.

The blue parallel light emitted from light source unit 11 and light source unit 12 is compressed by wedge prism 13 and wedge prism 14, and then condensed by condenser lens group 15, dichroic mirror 911, and lens group 915 to plate rotator 918.

A fan-shaped notch for transmitting blue light is provided in plate-shaped rotating body 918, and a part of the blue light is shaped by lens group 917 in accordance with the rotation of plate-shaped rotating body 918, and then is transmitted through dichroic mirror 914 and enters relay lens group 120.

Further, the region of the plate-shaped rotating body 918 other than the fan-shaped notch includes a fluorescent material, and in the present embodiment, the plate-shaped rotating body 918 is not light transmissive but is a reflective plate. Therefore, the yellow light emitted from the phosphor is reflected by the plate-shaped rotating body and emitted in the direction of the lens group 915. Lens group 915 is disposed at a position close to plate rotator 918 in order to efficiently condense the diffused yellow light. The yellow light is reflected by dichroic mirror 911, and then enters relay lens group 120 through lens group 916, mirror 912, mirror 913, and dichroic mirror 914.

As described above, the light source device 1 may be configured such that the light-reflective plate-shaped rotating body has a fluorescent material and yellow light whose wavelength has been converted is reflected by the plate-shaped rotating body and emitted.

The light source apparatus shown in the above embodiments can be used in both a projection display apparatus having a reflective light modulation device and a projection display apparatus having a transmissive light modulation device.

It is to be understood that the shapes, sizes, combinations, arrangements, and the like of the components of the light source device shown in the above embodiments may be appropriately changed according to various conditions such as the structure and the specification of the projection display device to which the present invention is applied.

Claims

1. A light source device is characterized by comprising:

two light emitting device arrays in which a plurality of blue laser light sources are arranged in an array;

a plurality of collimator lenses provided corresponding to the respective blue laser light sources;

two wedge prisms, which receive the parallel light emitted from the collimating lens, refract the received parallel light and emit the parallel light as compressed parallel light; and

a light-collecting unit for collecting the parallel light emitted from the two wedge prisms and irradiating the light to the fluorescent body,

the two light emitting device arrays are symmetrically arranged with a center line of the light collecting unit therebetween, and the two wedge prisms are symmetrically arranged with apex angles of wedges facing each other with the center line of the light collecting unit therebetween; or

The two wedge prisms are asymmetrically arranged with the apex angle of the wedge shape facing each other with the center line of the light collecting unit interposed therebetween, and the two light emitting device arrays are asymmetrically arranged with the center line of the light collecting unit interposed therebetween.

2. The light source device according to claim 1,

the angle formed by the parallel light emitted from the collimator lens and entering the two wedge prisms with respect to the center line of the light collecting unit is 20 degrees or more and 48 degrees or less.

3. The light source device according to claim 1,

the apex angles of the two wedge prisms are above 31 degrees and below 40 degrees.

4. The light source device according to claim 1,

the angle of incidence of the parallel light emitted from the collimator lens to the incidence plane of the two wedge prisms is within 5 degrees from the vertical.

5. The light source device according to claim 1,

when the two wedge prisms refract and emit parallel incident light as compressed parallel light, the compression ratio of the outgoing light to the incident light is 30% to 70%.

6. The light source device according to claim 1,

the light gathering unit is a light gathering lens group.

7. The light source device according to claim 1,

the light condensing unit is a parabolic reflector.

8. The light source device according to any one of claims 1 to 7,

the phosphor is formed on the light-transmitting plate-like rotating body.

9. The light source device according to any one of claims 1 to 7,

the fluorescent body is formed on the light-reflective plate-shaped rotating body.

10. A projection display device is characterized by comprising: the light source device of any one of claims 1 to 9; a light color selection unit; a reflective light modulation device; and a projection lens.

11. A projection display device is characterized by comprising: the light source device of any one of claims 1 to 9; a light color selection unit; a transmissive light modulation device; and a projection lens.