JP2018031995A - Light source device and projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a smaller projection type display device which uses a large-sized light source for condensing output light from semiconductor lasers, irradiating phosphor, and exciting the light to be emitted.SOLUTION: A very compact light source device is provided by utilizing an optical system which refracts and condenses parallel light of shorter wavelength using a wedge type prism, then condenses the light through a condenser lens to irradiate phosphor. The light source device allows for downsizing of the projection type display device.SELECTED DRAWING: Figure 1

Description

  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.

  In recent years, semiconductor lasers that output short-wavelength light with high luminous efficiency have been developed. 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 for a projection display device.

  In Patent Document 1, the output light of a two-dimensionally arranged semiconductor laser is condensed on a phosphor wheel through a large-diameter lens, and the fluorescence emitted from the excited phosphor wheel is color-selected with a color filter and selected. A projection display device that modulates light with a spatial light modulator such as DMD is described.

  Patent Document 2 describes a light source device and a projection display device that collects output light of a two-dimensionally arranged semiconductor laser on a phosphor through a large number of mirrors and condenser lenses and excites the phosphor. Yes.

  Patent Document 3 discloses a condensing block that is not a projection display device but is used for exciting a fiber laser so that the output light of a semiconductor laser is incident on the prism, totally reflected by the inner surface of the prism, and then emitted from the prism. Have been described.

JP 2014-160227 A JP 2012-195064 A JP 2008-28019 A

  In a projection display device that excites phosphors with the output light of a semiconductor laser as described in Patent Document 1, it is necessary to use a large number of semiconductor lasers in order to increase the intensity of the excitation light.

  Therefore, although the pumping light intensity is secured by using a pumping light source in which semiconductor lasers are arranged two-dimensionally, the operation of the semiconductor laser becomes unstable or the light emission efficiency decreases when the temperature is increased due to heat generated during operation. Therefore, there is a limit to the arrangement density when arranging the semiconductor lasers.

  For this reason, if a large number of semiconductor lasers are used, the area occupied by the excitation light source increases, the optical system for condensing the excitation light also occupies a large space, and the volume of the projection display device is large. It was.

  For example, in the apparatus described in Patent Document 1, it is necessary to use a large-diameter condensing lens that can cover the area occupied by two-dimensionally arranged excitation light sources.

  In the apparatus described in Patent Document 2, the output light of a two-dimensionally arranged semiconductor laser is condensed on a phosphor through a number of mirrors and a condenser lens, but the number of mirrors are precisely arranged. For this purpose, a support mechanism that is large and complicated to adjust is necessary, and the volume of the projection display device is large and unusable.

  The present invention has been made in view of such problems, and a light source device that condenses and excites the output light of a two-dimensionally arranged semiconductor laser on a phosphor with an extremely small optical system, and the light source device. An object of the present invention is to provide a small projection display device provided.

  The present invention receives a light emitting element array in which a plurality of blue laser light sources are arranged in an array, a plurality of collimating lenses provided corresponding to each of the blue laser light sources, and parallel light emitted from the collimating lenses. A light source device comprising: a wedge-shaped prism that emits refracted and compressed parallel light; and a condensing unit that condenses the parallel light emitted by the wedge-shaped prism and irradiates the phosphor. is there.

  In addition, the present invention provides a light emitting element array in which a plurality of blue laser light sources are arranged in an array, a plurality of collimating lenses provided corresponding to each of the blue laser light sources, and parallel light emitted from the collimating lenses. Light source device comprising: a wedge-shaped prism that receives and refracts and emits as parallel light that is refracted and condensed; and a light collecting device that collects the parallel light emitted by the wedge-shaped prism and irradiates the phosphor And a reflection type light modulation element or transmission type light modulation element, and a projection lens.

  ADVANTAGE OF THE INVENTION According to this invention, the light source device which condenses and excites the output light of the two-dimensionally arranged semiconductor laser on a fluorescent substance with a very small optical system can be provided. Furthermore, it is possible to provide a small projection display device including the light source device.

The figure which shows schematic structure of the projection type display apparatus which is 1st embodiment. The figure which shows the structure of a light source device. (A) The top view of a light source unit, (b) The side view of a light source unit, (c) The side view of another direction of a light source unit. (A) An example of arrangement | positioning of a light source module, (b) Other examples of arrangement | positioning of a light source module, (c) Other examples of arrangement | positioning of a light source module. The figure which shows the structure of a light source device. The figure which shows schematic structure of the projection type display apparatus which is 2nd embodiment. The figure which shows the other structure of a light source device. The figure which shows the other structure of a light source device. The figure which shows the other structure of a light source device. The figure which shows the other structure of a light source device. The figure which shows the other structure of a light source device, and schematic structure of a projection type display apparatus.

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 according to a first embodiment of the present invention and a projection display device having the light source device.

(Device configuration)
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 color selection wheel 130, a light tunnel 140, an illumination lens 150, a light modulation device 160, a prism 171, A prism 172 and a projection lens 180 are provided. Furthermore, a projection screen 190 may be 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 condensing lens 15, and a plate-like rotating body 16 provided with a phosphor. The light source device 1 will be described in detail later.

  The relay lens 120 is a lens for guiding the light emitted from the light source device 1 to the color selection wheel 130 and further condensing it at the entrance of the light tunnel 140. Consists of one or more lenses.

  The illumination lens 150 is a lens that shapes the light propagated through the light tunnel 140 into a light beam suitable for illuminating the light modulation element. Consists of one or more lenses.

  The prism 171 and the prism 172 together constitute a TIR prism (internal total reflection prism). The TIR prism causes the illumination light to be totally internally reflected, enter the light modulation element at a predetermined angle, and transmit the reflected light modulated by the light modulation element toward the projection lens 180.

  The light modulation device 160 is an element that modulates incident light based on a video signal, and uses a DMD provided with micromirror devices in an array. However, other reflective light modulation devices such as a reflective liquid crystal device can also be used.

  The projection lens 180 is a lens for projecting light modulated by the light modulation device as an image. Consists of one or more lenses.

  The projection screen 190 is used when configuring a rear projection type display device. Further, although it is often installed also in the case of the front projection type, it is not always necessary to provide it when the user projects on an arbitrary wall surface or the like.

(Light source device)
Next, the light source device 1 will be described in detail.

  FIG. 2 shows the light source device 1 extracted from the projection display device of FIG. 1. The light source unit 11, the light source unit 12, the wedge prism 13, the wedge prism 14, the condenser lens 15, and the phosphor are shown in FIG. A plate-like rotating body 16 is provided.

  In FIG. 2, C is the center line of the condenser lens 15. The light source unit 11 and the light source unit 12 are arranged symmetrically with respect to the center line C of the condenser lens. Similarly, the wedge prism 13 and the wedge prism 14 are also arranged symmetrically with respect to the center line C of the condenser lens.

  First, the light source unit will be described. Each of the light source unit 11 and the 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 each of the blue laser light sources. The blue laser light source and the collimating lens are modules. It has become. The blue laser light source used for the light source unit is a semiconductor laser that emits blue light.

  In order to describe the internal structure of the light source unit 11 and the light source unit 12, FIG. 3A shows a plan view, and FIGS. 3B and 3C show side views as seen from different directions.

  As shown in the side views of FIGS. 3B and 3C, the module substrate 31, the plurality of blue laser light sources 32, and the plurality of collimating lenses 33 are integrated as a module 300.

  As shown in the plan view of FIG. 3A, one module 300 includes a light emitting element array in which blue laser light sources 32 are arranged in a matrix of 2 × 4. However, the scale of the matrix arrangement included in one module is not limited to this example. A larger-scale matrix arrangement may be used, or a matrix arrangement having the same vertical and horizontal dimensions may be used.

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

  In addition, although one light source unit may be comprised with one module, in order to ensure required light quantity, you may comprise one light source unit with several modules.

  For example, as shown in FIG. 4A, a plurality of modules 300 may be arranged in the horizontal direction, and as shown in FIG. 4B and FIG. You may arrange | position combining in a direction.

  Next, a part that can be said to be a feature of the present invention, that is, a part in which substantially parallel light beams emitted from the light source unit are compressed by a wedge prism as a refractive optical system and guided to a condenser lens will be described.

  FIG. 5 is a diagram showing the arrangement of the light source unit 11, the light source unit 12, the wedge prism 13, the wedge prism 14, and the condenser lens 15.

  As already described, the light source unit 11 and the light source unit 12 are arranged symmetrically with respect to the center line C of the condenser lens. Similarly, the wedge prism 13 and the wedge prism 14 are also arranged symmetrically with respect to the center line C of the condenser lens 15.

  The light source unit 11 and the light source unit 12 are arranged so that the parallel rays emitted from the light source unit form an angle α with respect to the center line C of the condenser lens. α is referred to as a tilt angle of light incident on the prism.

  Each of the wedge prism 13 and the wedge prism 14 has a light incident surface S (IN) and a light exit surface S (OUT), and the apex angle formed by these surfaces is set to β. β is called the apex angle of the wedge-shaped prism.

  The position of the wedge-shaped prism 13 is such that the parallel light beam emitted from the light source unit 11 enters the light incident surface S (IN) almost perpendicularly, and the parallel light beam traveling through the prism is refracted at the light output surface S (OUT). The position is set so as to be emitted in parallel with the center line C of the condenser lens.

  Similarly, the position of the wedge-shaped prism 14 is such that the parallel light beam emitted from the light source unit 12 enters the light incident surface S (IN) substantially perpendicularly, and the parallel light beam that has traveled through the prism is the light output surface S (OUT). ) And the position is set so as to be emitted in parallel with the center line C of the condenser lens 15.

  When the width of the optical path of the substantially parallel light beam emitted from the light source unit is A and the width of the optical path of the substantially parallel light beam emitted from the wedge prism is B, according to the present invention, A> B. Is possible. Here, if B / A is a compression ratio CR, the smaller the CR is, the smaller the condenser lens 15 can be made. According to the present invention, it is possible to achieve a small compression ratio CR with a very compact optical system by extracting and compressing parallel light incident on the wedge prism by refraction.

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

  The light source unit is installed so that the parallel light emitted from the light source unit travels at an inclination angle α = 32 degrees. The apex angle β of the wedge-shaped prism is set to 38.01 degrees, and the parallel light from the light source unit is vertically incident on the light incident surface S (IN) at an incident angle of 0 degrees. The light traveling in the wedge prism enters the light exit surface S (OUT) at an incident angle of 38.01 degrees, is refracted at the interface with the atmosphere, and is a light beam parallel to the center line C of the condenser lens 15. As shown in FIG. At this time, the compression ratio CR is 0.434, that is, about 43%.

  Of course, the specific conditions for achieving a compression ratio smaller than 1 according to the present invention are not limited to the above example. However, in order to extract light by refraction, it is necessary that the light traveling in the prism does not cause total reflection at the interface between the light exit 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 degree, the condition for causing total reflection on the light emitting surface S (OUT) is given by the following equation (1).

θMax = ARCSIN (1 / n) (1)
In Equation (1), θMax is the angle at which the light traveling in the prism is totally reflected by the light exit surface S (OUT), and n is the refractive index of the prism material with respect to the wavelength used.

  When calculated using the refractive index of light having a wavelength of 450 nm exhibited by the BK7 glass material, that is, n = 1.526, the total reflection angle θMax is 40.943 degrees.

  Table 1 shows examples of combinations of the compression ratio CR, the inclination angle α, and the apex angle β that can be achieved by a prism having a refractive index n = 1.526 within a range not exceeding this limit.

  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 is preferably 20 degrees or more and 48 degrees or less.

  The compression rate CR can be highly compressed up to 2%. However, it should be noted that, if the compression ratio is reduced, the condition is close to the previously obtained total reflection condition, so that the characteristics change sensitively even if the arrangement of the light source and the prism is slightly deviated.

  Although not shown in Table 1, a light source device having a compression rate larger than 74% can be realized, but when the compression rate approaches 100%, the contribution to the purpose of downsizing the device becomes small.

  Therefore, considering the practical reliability and the merit of downsizing, the compression ratio CR is preferably 30% or more and 70% or less.

  Alternatively, the apex angle beta of the wedge prism is preferably in the range of 31 degrees to 40 degrees.

  As described above, the parallel light output from the light source unit is compressed by the wedge prism, and enters the condenser lens 15 as compressed parallel light. For this reason, it is possible to reduce the diameter of the condenser lens.

  The condensing lens 15 condenses incident light on the plate-like rotating body 16 to which the phosphor is added.

  In the present embodiment, as shown in FIG. 2, a phosphor obtained by adding a phosphor to a plate-like rotating body that can rotate around a rotation axis Ap is used.

  The reason for using a rotatable plate-like rotator is that the phosphor is irradiated with high-intensity excitation light that is focused on the blue laser light, but is irradiated so that it will continue to irradiate a certain point and no seizure deterioration will occur. This is because the area to be moved is moved.

As the phosphor material, a material that emits yellow light including a red component and a green component when irradiated with blue excitation light is used. For example, (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce, which is a YAG-based phosphor material.

  In addition, a part of the plate-like rotator is provided with a region that is not provided with a phosphor and transmits blue light as it is. Accordingly, when the plate-like rotating body is rotated, yellow light and blue light are emitted alternately.

  As described above, the present embodiment employs a system that excites a phosphor through a small condenser lens after refracting and compressing parallel light of a short wavelength with a wedge-shaped prism. A light source device could be realized.

(Operation of projection display device)
Next, returning to FIG. 1, the overall operation of the projection display apparatus will be described.

  The light emitted from the plate-like rotating body 16 provided with the phosphor is guided to the color selection wheel 130 via the relay lens 120.

  The color selection wheel 130 is a plate-like rotating body that can rotate around a rotation axis Ac, and each color filter of RGB is arranged in a fan shape. However, when the purity of the incident blue light is high, a fan-shaped notch (light transmission part) may be provided without providing the B filter.

  The plate-like rotating body 16 to which the phosphor is applied and the color selection wheel 130 rotate synchronously, and when the R filter is arranged when yellow light is emitted from the former, red is displayed from the former. The green color is transmitted through the color selection wheel 130 when the G filter is disposed when yellow light is emitted, and the blue color is transmitted while the B filter is disposed when blue light is emitted from the former.

  The light transmitted through the color selection wheel 130 enters the prism of the TIR prism via the light tunnel 140 and the illumination lens 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 modulation device 160 includes micromirror devices arranged in an array, drives each micromirror device according to a video signal, and reflects video light toward the prism 171 at a predetermined angle. The image light passes through the prism 171 and the prism 172, is guided to the projection lens 180, and is projected onto the projection screen 190.

  In the projection display device according to the first embodiment described above, the light source device of the present invention that refracts and compresses parallel light using a wedge prism is preferably used as a compact light source device. Miniaturization was realized.

[Second Embodiment]
In the first embodiment, the reflection type light modulation element 160 is used. In the second embodiment, a transmission type light modulation element is used.

  In FIG. 6, schematic structure of the projection type display apparatus which is 2nd embodiment of this invention is shown.

(Device configuration)
As shown in FIG. 6, the projection display device according to the second embodiment includes a light source device 1, a relay lens 610, a first lens array 620, a second lens array 630, a polarization conversion element 640, a superimposing lens 650, and a dichroic mirror. 660, 661, reflecting mirrors 662, 663, 664, cross dichroic prism 670, R lens 681, R transmissive liquid crystal panel 682, G lens 683, G transmissive liquid crystal panel 684, B lens 685, B A transmissive liquid crystal panel 686 and a projection lens 690 are provided. Furthermore, a projection screen 691 may be provided.

  The light source device 1 is substantially the same as in 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 15 as parallel light. The condensing lens 15 condenses incident light on the plate-like rotating body 16 to which the phosphor is added.

  The light emitted from the light source device 1 is guided to the first lens array 620 via the relay lens 610. The first lens array 620 includes a plurality of small lenses arranged in a matrix in order to divide light into a plurality of partial light beams. The second lens array 630 and the superimposing lens 650 convert the small lens image of the first lens array 620 into the vicinity of the screen area of the R transmissive liquid crystal panel 682, the G transmissive liquid crystal panel 684, and the B transmissive liquid crystal panel 686. To form an image. 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 element 640 converts the partial light beam 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. The dichroic mirror 661 is a dichroic mirror that reflects green light and transmits blue light.

  The reflection mirrors 662 and 663 are reflection mirrors that reflect blue light. The reflection mirror 664 is a reflection mirror that reflects red light.

  The linearly polarized red light enters the R transmissive liquid crystal panel 682 via the R lens 681, is modulated according to the image signal, and is emitted as video light. Incidentally, between the R lens 681 and the R transmissive liquid crystal panel 682, and between the R transmissive liquid crystal panel 682 and the cross dichroic prism 670, respectively, an incident side polarization plate (not shown) and an output side polarization plate ( (Not shown) is arranged.

  Similar to red, green light is modulated by the G transmissive liquid crystal panel 684, and blue light is modulated by the B transmissive liquid crystal panel 686, and emitted as video light.

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

  Video light output from the R transmissive liquid crystal panel 682 and the B transmissive liquid crystal panel 686 is reflected by the dielectric multilayer film toward the projection lens 690 and is output from the G transmissive liquid crystal panel 684. Passes through the dielectric multilayer film toward the projection lens 690.

  The image light of each color is superimposed and projected onto the projection screen 691 by the projection lens 690.

  Also in the projection display device according to the second embodiment described above, the light source device of the present invention that refracts and compresses parallel light with a wedge prism is preferably used as a compact light source device. It was possible to reduce the size.

[Other Embodiments of Light Source Device]
In the first embodiment and the second embodiment, an example in which parallel light beams emitted from the light source unit 11 are incident on the light incident surface S (IN) of the wedge prism 13 substantially perpendicularly as the light source device. However, the embodiment of the present invention is not limited to this.

  For example, as shown in FIG. 7, the main surfaces of the light source unit 11 and the light source unit 12 may not be parallel to the light incident surfaces S (IN) of the wedge prism 13 and the wedge prism 14. Even if the incident angle of the parallel light incident on the light incident surface S (IN) of the wedge-shaped prism from the light source unit is an oblique direction within 5 degrees with respect to the vertical, as in the embodiment described above, Parallel light can be compressed and emitted by refraction.

  In the first embodiment and the second embodiment, the example in which two wedge prisms are arranged symmetrically with respect to the center line C of the condenser lens as the light source device has been described. However, the embodiment is not limited thereto.

  For example, as shown in FIG. 8, a system that is asymmetric with respect to the center line C of the condenser lens may be used. In FIG. 8, the light source unit 81 and the wedge prism 83 form a pair, and the light source unit 82 and the wedge prism 84 form a pair. The light source unit 81 and the wedge-shaped prism 83 are in charge of a region straddling the center line C of the condenser lens, and emit parallel light toward the condenser lens 15.

  In the example of FIG. 8, two wedge prisms are in charge of the region above the center line C of the condenser lens. Of course, three or more prisms may be used. A plurality of wedge prisms may be used in place of the wedge prism 14 in the region below the center line C.

  Further, as shown in FIG. 9, a system that is asymmetric with respect to the center line C of the condenser lens may be used. In FIG. 9, the apex angle of the upper wedge prism 92 above the center line C of the condenser lens is made larger than the apex angle of the lower wedge prism 14, and the upper compression rate is the lower compression rate. To be bigger than.

  In the embodiment described above, the condensing lens is used as the condensing means for condensing the emitted light of the wedge prism on the phosphor, but the embodiment of the present invention is not limited to this.

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

  Further, in the above embodiment, a fluorescent material is applied to the translucent plate-shaped rotator, and the yellow light whose wavelength is converted by the phosphor is transmitted through the plate-shaped rotator and used. It is not limited to this.

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

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

  In FIG. 11, a 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 15, a dichroic mirror 911 that reflects yellow light but transmits blue light, and yellow light. A mirror 912 that reflects light, a mirror 913 that reflects yellow light, a dichroic mirror 914 that reflects yellow light but transmits blue light, a lens 915, a lens 916, a lens 917, and a plate-like rotating body 918 provided with a phosphor. ing.

  The blue parallel light emitted from the light source unit 11 and the light source unit 12 is compressed by the wedge-shaped prism 13 and the wedge-shaped prism 14, and passes through the condenser lens 15, the dichroic mirror 911, and the lens 915, and the plate-like rotating body 918. It is focused on.

  The plate-like rotator 918 is provided with a fan-shaped notch for transmitting blue light, and part of the blue light is shaped by the lens 917 in accordance with the rotation of the plate-like rotator 918 and is dichroic. The light passes through the mirror 914 and enters the relay lens 120.

  Moreover, although fluorescent substance is provided to area | regions other than the fan-shaped notch of the plate-shaped rotary body 918, in this embodiment, the plate-shaped rotary body 918 is not translucent but is a reflecting plate. Therefore, the yellow light emitted from the phosphor is reflected by the plate-like rotator and is emitted in the direction of the lens 915. The lens 915 is disposed at a position close to the plate-like rotating body 918 in order to effectively collect the diffused yellow light. The yellow light is reflected by the dichroic mirror 911 and enters the relay lens 120 via the lens 916, the mirror 912, the mirror 913, and the dichroic mirror 914.

  As described above, the light source device 1 may be the light source device 1 in which a fluorescent material is applied to the light-reflecting plate-like rotator and the wavelength-converted yellow light is reflected by the plate-like rotator.

  The light source device shown in the above embodiment can be used for either a projection display device having a reflective light modulation device or a projection display device having a transmissive light modulation device.

  In addition, the shape, size, combination, arrangement, and the like of the components of the light source device shown in the above embodiments can be changed as appropriate according to various conditions such as the configuration and specifications of the projection display device to which the present invention is applied. Of course.

  DESCRIPTION OF SYMBOLS 1 ... Light source device / 11 ... Light source unit / 12 ... Light source unit / 13 ... Wedge prism / 14 ... Wedge prism / 15 ... Wedge prism / 16 ... Fluorescence Plate-like rotating body to which a body is attached / 31... Module substrate / 32... Laser light source / 33... Collimating lens / 130 ... color selection wheel / 160 ... light modulation device / 180. Projection lens / 190 ... Projection screen / 670 ... Cross dichroic prism / 682 ... R transmission liquid crystal panel / 684 ... G transmission liquid crystal panel / 686 ... B transmission liquid crystal Panel / 690 ... Projection lens / 115 ... Parabolic mirror / 116 ... Folding mirror / 911 ... Dichroic mirror / 914 ... Dichroic mirror

Claims (13)

A light emitting element array in which a plurality of blue laser light sources are arranged in an array;
A plurality of collimating lenses provided corresponding to each of the blue laser light sources;
A wedge-shaped prism that receives parallel light emitted from the collimating lens, and emits the parallel light that is refracted and compressed;
Condensing means for condensing the parallel light emitted by the wedge-shaped prism and irradiating the phosphor;
A light source device comprising: The light emitting element array is symmetrically disposed across the center line of the light collecting means, and the wedge-shaped prism is disposed symmetrically across the center line of the light collecting means;
The light source device according to claim 1. The wedge-shaped prisms are arranged asymmetrically across the center line of the light collecting means, and the light emitting element array is arranged asymmetrically across the center line of the light collecting means,
The light source device according to claim 1. The parallel light emitted from the collimating lens and incident on the wedge-shaped prism has an angle of 20 degrees to 48 degrees with respect to the center line of the light collecting means.
The light source device according to claim 1, wherein the light source device is a light source device. An apex angle of the wedge-shaped prism is not less than 31 degrees and not more than 40 degrees;
The light source device according to claim 1, wherein the light source device is a light source device. The angle at which the parallel light emitted from the collimating lens is incident on the entrance surface of the wedge-shaped prism is within a range of 5 degrees from vertical.
The light source device according to claim 1, wherein the light source device is a light source device. When the wedge prism emits parallel incident light as parallel light compressed by refraction, the compression ratio of the emitted light with respect to the incident light is 30% or more and 70% or less.
The light source device according to claim 1, wherein the light source device is a light source device. The condensing means is a condensing lens.
The light source device according to claim 1, wherein the light source device is a light source device. The light collecting means is a parabolic mirror;
The light source device according to claim 1, wherein the light source device is a light source device. The phosphor is formed on a translucent plate-like rotating body,
The light source device according to claim 1, wherein the light source device is a light source device. The phosphor is formed on a light-reflective plate-like rotator,
The light source device according to claim 1, wherein the light source device is a light source device.   12. A projection display device comprising: the light source device according to claim 1; a color selection unit; a reflective light modulation element; and a projection lens.   12. A projection display device comprising: the light source device according to claim 1; a color selection unit; a transmissive light modulation element; and a projection lens.

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