JP2014219472A - Light source device and projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device that enables thinness or downsizing in a configuration employing an exciting light source and a rotating fluorescent member.SOLUTION: Emission light from each LD 18 is condensed to one ray of light, made incident to a switching diffraction grating 24, and switched to a first direction and a second direction. Light in the second direction passes a first dichroic mirror 30, and is irradiated upon a fluorescent member 14. The fluorescent member 14 has a Petri dish-like shape including a circular shape bottom face and a side face of a predetermined height at a periphery part of the bottom face. The fluorescent member 14 is arranged on an optical path of the light source device so that a rotation axis 12a of a motor 12 of the fluorescent member 14 is made orthogonal to an optical axis of one or both of a condensing optical system 22 and a condensing optical system 32 when viewing from a direction having the side face of the fluorescent member 14 viewed. Green fluorescent light (displayed by a broken line) emitted from a phosphor layer 34 is reflected upon the first dichroic mirror 30, and guided to a second dichroic mirror 38 through the condensing optical system 36. A code 42 denotes a reflection mirror.

Description

  The present invention relates to a light source device that emits light of different colors, and a projection display device having the light source device.

In recent years, large-screen display devices have rapidly spread, and conferences, presentations, trainings, etc. using them have become common.
There are various types of displays such as liquid crystal and plasma, and they are appropriately selected depending on the size of the place and the number of participants.
Among them, projectors are relatively inexpensive, small and light, easy to carry, and excellent in portability, so they can be said to be the most widely used large screen displays.
In such a background, recently, scenes and situations that require communication are increasing.
For example, in offices, there are many small meeting rooms and many meeting spaces partitioned by partitions, etc., and meetings and meetings using projectors are frequently held.

Furthermore, even if the conference room is not available, for example, you may frequently see sudden demand scenes such as when you want to make a meeting while projecting and displaying information on a wall using a space such as a passage. It came to be able to.
Conventionally, projectors using a high-intensity discharge lamp such as an ultra-high pressure mercury lamp as a light source have been the mainstream.
In recent years, developments have been made to use solid light-emitting elements such as red, green, and blue light-emitting diodes and organic EL as light sources, and many proposals have been made.

For example, Patent Document 1 discloses a light source device including a solid light source, a phosphor layer that converts ultraviolet light emitted from the solid light source into visible light, and a transparent substrate, and a projector using the light source device. .
In Patent Document 2, a solid-state light source that emits visible light instead of ultraviolet light, a phosphor layer that converts visible light into visible light of another wavelength, and a light source device that includes a transparent substrate, and The projector used is disclosed.
Patent Document 3 discloses a light source device that switches visible light emitted from a solid light source to first and second optical paths in a time-division manner by an optical path switching unit, and a projector using the same.
The light from the solid state light source that has passed through the first optical path is emitted as light in the same wavelength band, and the light that has passed through the second optical path is guided to the phosphor layer, converted to light in another wavelength band, and emitted. It has come to be.

However, these conventional techniques have a problem that the light source device cannot be reduced in thickness or size due to the structural limitations of the light source device.
The reason will be described with reference to FIG.
FIG. 9 shows a configuration example of a projector based on the conventional technology with reference to the technology of Patent Document 2.
FIG. 9A is a schematic view viewed from a direction perpendicular to the optical path surface, and FIG. 9B is a schematic view viewed from a direction horizontal to the optical path surface.

In FIG. 9, an excitation light source 100 outputs excitation light for irradiating a phosphor layer formed on a fluorescent wheel to be described later to emit predetermined color light.
As the excitation light, for example, blue light having a wavelength of 450 nm or its surroundings is used.
The fluorescent wheel 102 is composed of a circular transparent substrate 106 having a phosphor layer 104 and a motor 108, and is rotatable.
The transparent substrate 106 has a plurality of fan-shaped segment regions, and the phosphor layer 104 is formed on at least two of them.
Each phosphor layer 104 receives the excitation light and emits predetermined wavelength band lights (for example, red and green light) different from each other.

A phosphor layer is not formed in at least one of the other segment regions, and the excitation light is transmitted as it is.
A diffusion layer 110 is formed in the segment region so that the state of blue light emitted from the fluorescent wheel 102 is uniform with other light.
As a result, the fluorescent wheel 102 is rotated and the excitation light from the excitation light source 100 blinks in synchronization with the boundaries of the segment areas, whereby red, green, and blue color lights are sequentially emitted from the fluorescent wheel 102.
In order to increase the amount of monochromatic light emitted from one phosphor layer 104 and improve the utilization efficiency of effective light, an incident mask 114 having an opening formed corresponding to the shape of the light guide device 72 is used as an excitation light source. 100 and the fluorescent wheel 102.
The light emitted from the fluorescent wheel 102 is incident on the light guide device 72 to be converted into a light beam having a uniform intensity distribution, and then condensed by the condensing lens group 74 and is displayed at a predetermined angle by the reflecting mirror 76. Is irradiated.

The control device 122 forms an image corresponding to the color irradiated on the display element 78 on the display element 78 and modulates the irradiation light.
The modulated light enters the projection lens group 80 and is enlarged and projected onto a screen (not shown) or the like to display a desired image.

As described above, in the prior art, the phosphor layer is provided on the plane where the concentric circles of the circular fluorescent wheel spread, and the plane on which the phosphor layer is provided is used as the optical axis of the optical system provided in the light source device. On the other hand, it is arranged vertically.
In such a configuration, as is clear from FIG. 9B, even if each component or device arranged in the optical axis is made small, the height of the fluorescent wheel is restricted by the diameter of the fluorescent wheel and the height is perpendicular to the optical axis. The width h in the direction cannot be reduced any further.

  The present invention was devised in view of such a current situation, and the main object of the present invention is to provide a light source device that can be reduced in thickness or size in a configuration using an excitation light source and a rotating fluorescent member. To do.

  To achieve the above object, the present invention provides an excitation light source that generates excitation light, a fluorescent member that receives the excitation light and generates fluorescent light in a wavelength band different from the excitation light, and a drive that rotates the fluorescent member. In the light source device comprising a light source, the fluorescent member has a light receiving surface capable of receiving light incident from a direction perpendicular to the rotation axis of the fluorescent member, and the light receiving surface includes a phosphor, The excitation light is incident on the light receiving surface of the fluorescent member.

  According to the present invention, it is possible to promote thinning or downsizing of the light source device, and it is possible to contribute to convenience and expansion of usage scenes.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the light source device which concerns on the 1st Embodiment of this invention, (a) is the figure seen from the perpendicular | vertical direction with respect to an optical path surface, (b) is seen from the horizontal direction with respect to an optical path surface. It is a figure. It is a schematic block diagram which shows the light source device which concerns on 2nd Embodiment, (a) is the figure seen from the direction perpendicular | vertical to an optical path surface, (b) is the figure seen from the direction horizontal with respect to an optical path surface. is there. It is a front view of the mirror wheel as an optical path switching means. It is a timing chart which shows the operation example of the light source device which concerns on 2nd Embodiment. It is a schematic block diagram which shows the light source device which concerns on 3rd Embodiment, (a) is the figure seen from the direction perpendicular | vertical with respect to an optical path surface, (b) is the figure seen from the direction horizontal with respect to an optical path surface. is there. It is a schematic block diagram which shows the light source device which concerns on 4th Embodiment, (a) is the figure seen from the direction perpendicular | vertical to an optical path surface, (b) is the figure seen from the direction horizontal with respect to an optical path surface. is there. It is a figure which shows the modification of a fluorescent member. It is a schematic block diagram which shows the projection display apparatus which concerns on 5th Embodiment, (a) is the figure seen from the direction perpendicular | vertical to an optical path surface, (b) is the figure seen from the direction horizontal with respect to an optical path surface. It is. It is a schematic block diagram which shows the conventional projection display apparatus, (a) is the figure seen from the direction perpendicular | vertical with respect to an optical-path surface, (b) is the figure seen from the horizontal direction with respect to the optical-path surface.

Embodiments of the present invention will be described below with reference to the drawings.
A first embodiment will be described with reference to FIG. 1A and 1B are diagrams illustrating a configuration of a light source device according to the present embodiment, where FIG. 1A is a diagram viewed from above, and FIG. 1B is a diagram viewed from a side surface direction.
The signal CTRL input to the control unit 10 is a control signal for controlling on / off of the light source light output and the output timing of each color light.
For example, it can be realized by inputting a corresponding command or data using serial communication interface means such as I2C or SPI.
When activated by the above-described control signal CTRL, the control unit 10 outputs a motor drive signal MD1 and starts driving the motor 12 as a drive source.

A fluorescent member 14 having a cylindrical outer shape is attached to the rotating shaft 12 a of the motor 12. The shape of the fluorescent member 14 is actually a petri dish having a very small height with respect to the diameter.
A function of detecting the rotation state of the motor 12 is added to the motor 12, and an index signal MX1 synchronized with the rotation of the motor 12 is output.

When the controller 10 detects that the motor 12 is rotating normally by the index signal MX1, the controller 10 outputs an LD (Laser Diode) drive current IL1.
The LD module 16 has a plurality of LDs 18 as excitation light sources mounted thereon, and also has a heat sink function for radiating heat generated from the LD 18.
Further, the collimator lens 20 is also configured to be integrated with the LD 18 in order to facilitate mounting while ensuring the positional accuracy between the collimator lens 20 and the LD 18.
Each collimator lens 20 constitutes a collimator lens group.

The plurality of LDs are driven by a drive current IL1, and emit blue (B) light, for example. Each LD is provided with a corresponding collimator lens 20 to collimate the emitted light.
The collimated light emitted from each LD is condensed into one light beam by a condensing lens system (hereinafter also referred to as “condensing optical system”) 22 and is incident on a switching diffraction grating 24 as optical path switching means. .
The switching diffraction grating 24 is a time-division switching mirror that switches an optical path by transmitting or reflecting arbitrary polarized light according to the voltage of the control signal VP to be applied, and can be configured by using, for example, Digilens (registered trademark).
The control unit 10 includes optical path switching control means, controls the voltage of the control signal VP in synchronization with the index signal MX1 from the motor 12, and transmits light incident on the switching diffraction grating 24 to a first optical path or a second optical path described later. Switch to the optical path.

The LD light as the second light switched to the second optical path 28 in the second direction by the switching diffraction grating 24 passes through the first dichroic mirror 30 and passes through a condensing lens system (hereinafter referred to as “condensing optics”). It is further condensed by 32).
And it irradiates to the above-mentioned fluorescent member.
The first dichroic mirror 30 has characteristics such that the blue band light of the LD light is transmitted, but the band light having a wavelength longer than green is reflected.

The fluorescent member 14 has, for example, a petri dish having a circular bottom surface and a side surface having a predetermined height at a peripheral end portion of the bottom surface, and the rotating shaft 12a of the motor 12 is attached to the center of the circular bottom surface. It has been.
A phosphor layer 34 as a phosphor is formed outside the side surface of the phosphor member 14. For example, the phosphor layer 34 absorbs light in the blue wavelength band and emits light in the green (G) wavelength band. It has the characteristics to do.
In the present embodiment, the phosphor layer 34 is formed over the entire circumference of the fluorescent member 14, but it may be formed only in a necessary region depending on the system.

The rotating shaft 12a of the motor 12 of the fluorescent member 14 is perpendicular to the optical axis of the condensing optical system 22 or the condensing optical system 32 or both when viewed from the direction in which the side surface of the fluorescent member 14 can be seen. The fluorescent member 14 is disposed in the optical path of the light source device.
By arranging in this way, the side surface of the fluorescent member 14 can receive the excitation light from the LD.
That is, the side surface of the fluorescent member 14 serves as a light receiving surface capable of receiving light incident from a direction perpendicular to the rotation shaft 12a.
According to the present embodiment, the diameter of the circular fluorescent member 14 spreads in the horizontal direction with respect to the optical path surface, so the height of the light source device viewed from the direction in which the side surface of the fluorescent member 14 can be seen is It becomes possible to make it thinner than the diameter.
If a reflective layer is further coated between the phosphor layer and the phosphor member, the emitted light from the phosphor layer can be efficiently extracted to the first dichroic mirror 30 side, which is more preferable.

Green fluorescent light (shown by broken lines) emitted from the phosphor layer 34 is reflected by the first dichroic mirror 30 and guided to the second dichroic mirror 38 through the condensing optical system 36.
On the other hand, the blue LD light as the first light switched to the first optical path 26 as the first direction by the switching diffraction grating 24 passes through the diffusion plate 40.
The diffuser plate 40 removes the coherency as the laser light to make it normal light similar to the fluorescent light, and guides it to the reflecting mirror 42 through the condensing optical system 36.
The second dichroic mirror 38 transmits the LD light incident through the reflection mirror 42 and reflects the fluorescent light incident from the other optical path, thereby guiding both lights to the same optical path, thereby collecting light. The light is condensed through the system 36 and output as light source light.

  The first dichroic mirror 30 and the second dichroic mirror 38 are generated when the first light passing through the first optical path 26 and the second light passing through the second optical path 28 enter the fluorescent member 14. A light guiding optical system for guiding the fluorescent light to the same optical path.

A second embodiment will be described with reference to FIGS.
Note that the same parts as those in the above-described embodiment are denoted by the same reference numerals, and unless otherwise specified, description of the configuration and functions already described is omitted, and only the main parts will be described (the same applies to other embodiments below).
The configuration according to the present embodiment differs from the configuration shown in FIG. 1 in three points. Differences will be described below.
First, in this embodiment, as shown in FIG. 2, an LED module 44 that outputs light in a wavelength band (for example, red) different from both the wavelength band of LD light and the wavelength band of fluorescent light in FIG. 1 is added. Has been.

The LED module 44 is mounted with an LED (Light Emitting Diode) 46 as a light source, and also has a heat sink function for radiating heat generated from the LED 46.
The collimator lens 20 is also mounted integrally with the LED 46 in order to facilitate mounting while ensuring the positional accuracy between the collimator lens 20 and the LED 46.
Each collimator lens 20 constitutes a collimator lens group.

The LED 46 is driven by a drive current IL2 output from the control unit 10, and emits red (R) light, for example.
The LED 46 is provided with a collimator lens 20 correspondingly, and collimates the emitted light.
The collimated LED light is condensed by the condensing optical system 36 and is incident on the third dichroic mirror 52.

Secondly, in the present embodiment, a mirror wheel 54 is provided as an optical path switching means different from the switching diffraction grating 24 in FIG.
For example, as shown in FIG. 3, the mirror wheel 54 has a configuration in which a disk 56 divided into two regions A and B is attached to a rotation shaft 58 a of a motor 58.
The region A of the disk 56 has a function of reflecting incident light, and the region B has a function of transmitting incident light.
Such a disk 56 can be realized at low cost by forming a highly reflective material such as aluminum only in the region A on a transparent glass substrate, and transmits and reflects incident light by rotating it. You can switch to time division.

When activated by the control signal CTRL, the control unit 10 outputs the motor drive signal MD2 and starts driving the motor 58.
As described above, the disk 56 is attached to the rotation shaft 58a of the motor 58, and the disk 56 is rotated.
The motor 58 has a function of detecting its rotational state, and outputs an index signal MX2 synchronized with the rotation of the motor 58.
When the controller 10 detects that both the motor 12 and the motor 58 are normally rotated by MX2 together with the index signal MX1, the controller 10 outputs the LD drive current IL1.

The control unit 10 includes an optical path switching control means, and controls the phase of the motor drive signal MD2 in synchronization with the index signal MX1 from the motor 12, thereby allowing the light incident on the mirror wheel 54 to be incident on the first mentioned above at a desired timing. Switch to the second optical path or the second optical path.
That is, the control unit 10 controls the motor 58 as the optical path switching member driving unit so that either one of the transmission area B and the reflection area A exists on the optical path of the light emitted from the excitation light source.

Third, the reflection mirror 42 is replaced with a third dichroic mirror 52, and the characteristics of the second dichroic mirror 38 are changed.
That is, the third dichroic mirror 52 transmits light in a wavelength band longer than the red wavelength band, and reflects light that is not.
The second dichroic mirror 38 reflects light only in the green wavelength band and transmits light in other wavelength bands.
By these, the red (R), blue (B), and green (G) light described above can be synthesized and emitted as light source light.

  In the present embodiment, the first dichroic mirror 30, the second dichroic mirror 38, and the third dichroic mirror 52 are the first light passing through the first optical path 26 and the first light passing through the second optical path 28. A light guide optical system that guides the fluorescent light generated when the second light enters the fluorescent member 14 to the same optical path is configured.

FIG. 4 is a timing chart illustrating an operation example of the light source device according to the present embodiment.
The index signal MX2 indicates that the motor 58 rotates at one rotation period T0.
The LD 18 emits blue light when the drive signal IL1 is “H”, and the LED 46 similarly emits red light when the drive signal IL2 is “H”.

In this figure, first, blue light (B) is output as light source light during the time T1 shown in the figure.
This indicates that the mirror wheel 54 is controlled in a phase relationship such that incident LD light is reflected by the region A during this time.
On the contrary, the LD light is transmitted through the region B and guided to the fluorescent member 14 during the time T2.
During time T4, since the drive signal IL1 is “H” and IL2 is “L”, the LED does not emit red light but emits only LD light.
Since the LD light is transmitted through the mirror wheel 54, green (G) of fluorescent light is output as light source light as a result.

During time T5, since the drive signal IL1 is “L” and IL2 is “H”, only the LED emits light and is output as red (R) light source light.
During the time T3, the drive signals IL1 and IL2 are both “H”, so the red light of the LED and the fluorescent light excited by the LD light are combined to generate yellow (Y) light. .
That is, it is shown that light in other wavelength bands can be generated by controlling the emission timing of red, blue, and green.

The mirror wheel 54 in the present embodiment is similar in shape to the fluorescent wheel shown in FIG.
However, since the fluorescent wheel generally has a high temperature exceeding 100 ° C in the vicinity of the excitation light irradiation position, rotating the wheel releases heat to the entire wheel to prevent deterioration and damage of the phosphor layer. ing.
Therefore, since a certain amount of heat capacity is required, for example, a size of about 50 mm in diameter is required, but the mirror wheel can transmit or reflect incident light with a high efficiency of 90% or more.
For this reason, a heat capacity is small and it can comprise with a diameter below half.
Therefore, the light source device, which is the object of the present invention, does not hinder the reduction in size and thickness.

  As for the curvature of the place where the excitation light is incident, since the fluorescent light is diffused light, the problem of light loss hardly occurs, and there is no problem of light loss as long as the wheel diameter is flat enough to meet the heat capacity requirement. .

FIG. 5 shows a third embodiment.
In this embodiment, the configuration shown in FIGS. 1 and 2 is used.
Utilizing the thin fluorescent member 14, the means for combining the LD light reflected by the mirror wheel 54, which is an optical path switching means, and the fluorescent light excited by the LD light transmitted through the mirror wheel 54 is directed upward. In this configuration, the combined light source light passes above the fluorescent member.
By adopting such an arrangement, it is possible to realize a slim light source device while keeping the thin shape by taking advantage of the thin fluorescent member.
That is, the light source device can be thinned in the height direction due to the specific arrangement of the fluorescent member of the present invention, and the width direction dimensions shown in FIGS. 1 (a) and 2 (a) can be simultaneously reduced. As a whole, downsizing can be promoted.

FIG. 6 shows a fourth embodiment.
In this embodiment, the configuration shown in FIGS. 2 and 5 is used.
Basically, an LED module 44 is added to the configuration shown in FIG. 5 to provide a thin and slim light source device capable of outputting light sources of three or more primary colors as shown in FIG.
That is, in this embodiment, similarly to the configuration shown in FIG. 5, the LD light reflected by the mirror wheel 54 that is the optical path switching means, the fluorescent light excited by the LD light that has passed through the mirror wheel 54, and the LED Combining means with the LED light from the module 44 is configured upward, and the combined light source light passes above the fluorescent member.
Therefore, in the light source device capable of outputting light sources of three or more primary colors, the light source device can be thinned in the height direction and thinned in the width direction simultaneously due to the specific arrangement of the fluorescent member of the present invention.
The synthesizing unit may be configured to pass below the fluorescent member.

In each of the above embodiments, the fluorescent member is configured to have a single petri dish having a rotation axis at the center of a circle, but the present invention is not limited to this.
For example, as shown in FIG. 7, a band (belt) 64 including a phosphor layer may be wound around two rotating bodies 60 and 62 having rotation axes 60a and 62a in parallel relation to each other to form a fluorescent member 66. .
FIG. 7A shows an example in which the line connecting the rotation axes of the rotator is arranged in parallel with the optical axis, and FIG. 7B shows an example in which the line is arranged orthogonal to the optical axis. .
Here, an example in which the maximum length of the range occupied by the rotators 60 and 62 is within the range of the outer diameter of the fluorescent member 14 is shown.

The fluorescent member 66 is arranged in the optical path of the light source device so that the rotation axes parallel to each other are perpendicular to the optical axis of the optical system in the light source device. The height can be reduced.
Here, a configuration including two rotating bodies has been illustrated, but three or more may be used.
In the example of FIG. 7A, slimming in the width direction orthogonal to the height direction can be further promoted.

FIG. 8 shows a fifth embodiment (projection display device).
The projection display device according to the present embodiment includes an image processing unit 68, a light source device 70, a light guide device 72, a condenser lens group 74, a reflection mirror 76, a display element 78, and a projection lens group 80. I have.
The light source device 70 is any one of the light source devices shown in the above embodiments.
The light guide device 72, the condenser lens group 74, and the reflection mirror 76 constitute a light source side optical system that guides light from the light source device 70 to the display element 78.
The projection lens group 80 serves as a projection-side optical system that projects an image emitted from the display element 78 onto a screen (not shown).

The control unit 10 also functions as a display control unit that controls the light source device 70 and the display element 78.
The light source device 70 is, for example, the light source device shown in FIG. 2 or FIG.
When the video signal VIN is input, the video processing unit 68 outputs rotation cycle data of the mirror wheel 54 to the light source device 70 via the control signal CTRL based on the frame frequency.
Further, the rotation phase data of the mirror wheel 54 and the output timing data of each color light are sequentially output.

When the video processing unit 68 outputs each data as described above and completes the setting for the light source device 70 to perform a desired operation, the video processing unit 68 outputs a start command to start the light source device 70.
When activated, the light source device 70 sequentially outputs red, blue, green, and yellow light at a predetermined timing as described above.
Light emitted from the light source device is converted into uniform planar illumination light by the light guide device 72, and irradiated to the display pixel region of the display element 78 through the condenser lens group 74 and the reflection mirror 76.

The video processing unit 68 further generates a display signal corresponding to each color of the illumination light from the video signal VIN, converts it into a signal VDO for driving the display element 78, and outputs it.
As a result, the illumination light incident on the display element 78 is modulated into image light and projected onto a screen or the like through the projection lens group 80 to display an image.
Here, as the display element 78, for example, a DMD (Digital Mirror Device) is used, which constitutes each pixel of the display image and modulates the illumination light into image light by controlling the angle with respect to the incident illumination light. The

DESCRIPTION OF SYMBOLS 10 Control part as optical path switching control means 10 Control part as display control means 12 Motor as drive source 14 Fluorescent member 18 LD as excitation light source
24 Switching diffraction grating as optical path switching means 34 Phosphor layer as phosphor 46 LED as second light source
52 Third dichroic mirror as second light guide optical system 54 Mirror wheel as optical path switching member 58 Motor as optical path switching member driving means 70 Light source device A Area as reflection area B Area as transmission area

JP 2004-341105 A JP 2009-277516 A JP 2012-141581 A

Claims (7)

An excitation light source that generates excitation light;
A fluorescent member that receives the excitation light and generates fluorescent light in a wavelength band different from the excitation light;
A drive source for rotating the fluorescent member;
In a light source device comprising:
The fluorescent member has a light receiving surface capable of receiving light incident from a direction perpendicular to the rotation axis of the fluorescent member;
The light receiving surface includes a phosphor,
The light source device, wherein the excitation light is incident on the light receiving surface of the fluorescent member. The light source device according to claim 1,
An optical path switching means for switching the light emitted from the excitation light source in a time division manner between the first light irradiated in the first direction and the second light irradiated in the second direction;
A light guide optical system that causes the second light to enter the fluorescent member, and guides the fluorescent light generated by the first light and the second light entering the fluorescent member to the same optical path;
A light source device comprising: The light source device according to claim 2,
Comprising optical path switching control means for controlling the optical path switching means,
The light source device, wherein the optical path switching means is a switching diffraction grating that switches an optical path under the control of the optical path switching control means. The light source device according to claim 2,
Comprising optical path switching control means for controlling the optical path switching means,
The optical path switching means is
An optical path switching member comprising a transmissive region that transmits incident light and a reflective region that reflects the incident light;
An optical path switching member driving unit that drives the optical path switching member so that either one of the transmission region and the reflection region exists on the optical path of the light emitted from the excitation light source by the control of the optical path switching control unit. When,
A light source device comprising: In the light source device according to any one of claims 1 to 4,
The light source device, wherein the light guide optical system is arranged so that at least a part of an optical path of the excitation light and the fluorescent light passes above or below the fluorescent member. In the light source device according to any one of claims 1 to 5,
A second light source that emits light having a wavelength band different from that of the excitation light and the fluorescent light, and a second light guide optical system that guides light emitted from the second light source to the same optical path as the fluorescent light A light source device characterized by that. A light source device, a display element, a light source side optical system that guides light from the light source device to the display element, a projection side optical system that projects an image emitted from the display element onto a screen, and the light source device And display control means for controlling the display element;
In a projection display device comprising:
A projection display device, wherein the light source device is the light source device according to any one of claims 1 to 6.

Images