JP2012221820A - Method of adjusting light source device, light source device, and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of adjusting a light source device, capable of precisely adjusting an arrangement position of a phosphor in a short time, and to provide a light source device.SOLUTION: The method of adjusting a light source device includes: a first step of condensing by a condensing means 20 an excitation light of a first light volume emitted from an excitation light source 10 to be incident on a phosphor; a second step of detecting the first light volume of the phosphor emitted from the phosphor; a third step of condensing by the condensing means 20 the excitation light of a second light volume to be incident on the phosphor; a fourth step of detecting the second light volume of the phosphor emitted from the phosphor; and a fifth step of adjusting relative positions of the condensing means 20 and the phosphor based on a ratio between the first light volume of the phosphor against the light volume of the first excitation light and the second light volume of the phosphor against the light volume of the second excitation light.

Description

  The present invention relates to a light source device adjustment method, a light source device, and a projector.

As a light source device for a projector, a light source device described in Patent Document 1 is known. The light source device of Patent Literature 1 includes an excitation light source and a phosphor that emits fluorescence when excited by excitation light emitted from the excitation light source. In the light source device of Patent Document 1, in order to reduce the light emission area of a phosphor as a secondary light source, excitation light is condensed at one point and is incident on the phosphor.

JP 2004-327361 A

As a method of detecting the condensing position of the excitation light, for example, there is a method of detecting the position where the condensing spot of the excitation light is minimum by image processing using a CCD monitor. However, in this method, it takes time to arrange the phosphor after observation by the CCD monitor, and it takes time to adjust the condensing position of the excitation light. In addition, there may be a difference between before and after arranging the phosphor, and the position where the excitation light is collected cannot be accurately adjusted.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a light source device adjustment method and a light source device capable of accurately adjusting the condensing position of excitation light in a short time. To do. It is another object of the present invention to provide a projector having such a light source device and excellent in display quality.

In order to solve the above-described problems, the light source device adjustment method of the present invention includes a first step of condensing excitation light having a first light amount emitted from an excitation light source by a condensing unit and entering the phosphor. The relative position between the light collecting means and the phosphor is changed, and the amount of first fluorescence emitted from the phosphor is detected upon receiving the first amount of excitation light for each changed relative position. A second step of:
A third step of condensing a second light amount of excitation light having a light amount larger than the first light amount of excitation light by a condensing unit and entering the phosphor; and the condensing unit and the phosphor A fourth step of changing the relative position, receiving the second amount of excitation light for each changed relative position, and detecting the amount of second fluorescence emitted from the phosphor; and for each relative position Based on the position at which the light quantity ratio becomes the largest among the ratios of the first fluorescent light quantity to the second excitation light quantity and the second fluorescent light quantity to the second excitation light. And a fifth step of adjusting a relative position between the light collecting means and the phosphor.

When the light intensity (light density) of the excitation light incident on the phosphor increases, the light intensity of the excitation light is affected by the effect of temperature rise (temperature quenching phenomenon) and the effect of decrease in the number density of absorption levels (light saturation phenomenon). The amount of fluorescent light may decrease. In other words, the luminous efficiency of the phosphor obtained by dividing the amount of fluorescence by the amount of excitation light may decrease. If the amount of excitation light is constant, the amount of fluorescence itself In other words, can be reduced. In the present invention, such a phenomenon is actively used to detect the condensing position of the excitation light.

At the position where the excitation light is collected, the amount of light (light density) of the excitation light in the light emitting portion of the phosphor irradiated with the excitation light increases, and the amount of fluorescence relative to the amount of excitation light decreases. Therefore, by positioning the phosphor based on the position where the amount of fluorescence with respect to the amount of excitation light is the smallest, the relative position between the condensing means and the phosphor is adjusted with reference to the position where the excitation light is collected, The phosphor can be arranged at a desired position. If the phosphor is arranged at the position where the excitation light is collected, the light emission area can be reduced, and the performance as the light source device can be improved. In addition, in consideration of the characteristics of the entire optical system of the device equipped with the light source device, the condensing position can be easily obtained even when the phosphor is arranged at a position shifted from the condensing position of the excitation light. Because you can
The position of the phosphor can be easily adjusted.

Here, in the process of changing the relative position between the light collecting means and the phosphor, when the fluorescence emitted from the phosphor does not completely enter the region (detection region) where the amount of fluorescence is detected (the fluorescence is outside the detection region). If there is a leak). In the process of changing the relative position between the light collecting means and the phosphor, if only one fluorescent light quantity is used, the kicked portion cannot be eliminated. For example, when there is a portion with the smallest amount of fluorescent light outside the detection area, the focal position is calculated without considering the amount of fluorescent light outside the detection area where kicking has occurred. There is a possibility that the light condensing position cannot be accurately adjusted. On the other hand, according to the method of the present invention, by using two light amounts of excitation light, the light amount of the portion where the fluorescence does not enter the detection region is canceled (so-called kicked portion is eliminated). For this reason, the condensing position of excitation light can be adjusted accurately.

In addition, according to this method, the light quantity ratio is the largest of the ratios of the first fluorescent light quantity to the first excitation light quantity and the second fluorescent light quantity to the second excitation light quantity for each relative position. The relative position between the light condensing means and the phosphor is adjusted based on the position when it increases. That is, the relative position between the light collecting means and the phosphor is adjusted while eliminating the kicked portion. Since the position where the fluorescence light intensity is the smallest relative to the excitation light intensity of the phosphor is the excitation light condensing position, the phosphor is positioned based on the position where the ratio of the fluorescence light intensity to the excitation light intensity is the largest. The phosphor can be arranged at a desired position based on the focal position of the excitation light. Further, the method of the present invention employs a method of adjusting the relative position between the light collecting means and the phosphor while the phosphor is arranged, and it is not necessary to remove or arrange the phosphor during the adjustment process. For this reason, adjustment of the condensing position of excitation light does not take time, or a shift | offset | difference does not arise. Therefore, the condensing position of excitation light can be adjusted accurately in a short time. Therefore, the position of the phosphor can be easily adjusted.

In the fifth step, the adjustment method of the light source device of the present invention is a ratio of the fluorescence light amount to the first light amount excitation light incident on the phosphor for each changed relative position. The ratio between the first luminous efficiency E1 of the phosphor and the second luminous efficiency E2 of the phosphor, which is the ratio of the amount of fluorescence to the second amount of excitation light incident on the phosphor, The luminous efficiency ratio E1 / E2 of the phosphor is set, and the luminous efficiency ratio E1 / E2 of the phosphor is set to the light quantity of the first fluorescence and the light quantity of the second excitation light with respect to the light quantity of the first excitation light. The relative position between the light condensing means and the phosphor may be adjusted using the ratio to the amount of second fluorescent light.

According to this method, the luminous efficiency ratio E1 / E2 of the phosphors determined for each changed relative position.
The relative position between the light collecting means and the phosphor is adjusted based on the position at which the light emission efficiency ratio is the largest. That is, the relative position between the light condensing means and the phosphor is adjusted to a desired position based on the position at which the light emission efficiency becomes the smallest among the second light emission efficiencies E2 while eliminating the kicked portion. By using the luminous efficiency of the phosphor, adjustment can be performed without being affected by fluctuations in the amount of excitation light, and the position of the phosphor can be easily adjusted.

In the adjustment method of the light source device according to the present invention, the second light amount of the phosphor by the excitation light of the second light amount when the phosphor is disposed at a focal position of the light collecting means. The amount of light may cause a decrease in luminous efficiency due to temperature rise or light saturation.

According to this method, when the excitation light of the second light quantity is incident on the phosphor through the light collecting means, the luminous efficiency of the phosphor can be reduced at the focal position of the excitation light. Therefore, adjustment of the condensing position of excitation light becomes easy. Therefore, the position of the phosphor can be easily adjusted.

In the method for adjusting a light source device according to the present invention, laser light may be emitted as excitation light having the second light amount from a plurality of laser light sources constituting the excitation light source.

According to this method, the power of the excitation light source can be improved. For this reason, when the excitation light of the second light quantity is incident on the phosphor through the light collecting means, the temperature of the phosphor rises at the focal position of the excitation light, and the fluorescence light quantity with respect to the excitation light quantity decreases. Therefore, it is possible to easily adjust the condensing position of the excitation light using a phenomenon in which the amount of fluorescence decreases with respect to the amount of excitation light.

In the light source device adjustment method of the present invention, the excitation light of the first light amount and the second light amount may be intermittently emitted by driving the excitation light source in pulses.

According to this method, since there is a non-irradiation time to the phosphor, it is possible to make a higher excitation light amount incident on the phosphor than when the excitation light source is continuously driven. Therefore, it is possible to easily adjust the condensing position of the excitation light using a phenomenon in which the amount of fluorescence decreases with respect to the amount of excitation light.

Moreover, the adjustment method of the light source device of this invention may fluctuate | variate temporally the part into which the said 1st light quantity of the said fluorescent substance and the said 2nd light quantity enter the excitation light.

According to this method, once the phosphor is irradiated with excitation light, there is an unirradiated time until the next irradiation, so that a higher excitation light amount is incident on the phosphor than when the phosphor is fixed. It becomes possible. Therefore, it is possible to easily adjust the condensing position of the excitation light using a phenomenon in which the amount of fluorescence decreases with respect to the amount of excitation light.

Further, the adjustment method of the light source device of the present invention irradiates the phosphor with excitation light having a light amount larger than the light amount actually used as the light source as the excitation light, thereby determining the relative position between the light collecting means and the phosphor. You may adjust.

According to this method, the decrease in the amount of fluorescence with respect to the amount of excitation light is increased, so that the measurement accuracy is improved.

The light source device of the present invention receives an excitation light source capable of changing the amount of excitation light, a condensing means for condensing the excitation light emitted from the excitation light source, and the excitation light collected by the condensing means. A fluorescent material that emits fluorescent light, a detection device that detects the amount of fluorescent light emitted from the fluorescent material, a relative position of the light collecting means and the fluorescent material is changed, and the first light that enters the fluorescent material The position at which the ratio of the first fluorescent light amount to the excitation light amount and the second fluorescent light amount to the second excitation light amount that is greater than the first excitation light amount is the largest. And a position adjusting mechanism for adjusting a relative position between the light collecting means and the phosphor.

According to this configuration, the position at which the light amount ratio becomes the largest in the ratio between the light amount of the first fluorescence with respect to the light amount of the first excitation light and the light amount of the second fluorescence with respect to the light amount of the second excitation light. Based on this, the relative position between the light collecting means and the phosphor is adjusted. For this reason, the light emission efficiency of the portion where the fluorescence does not enter the detection region can be canceled (so-called kicked portion is eliminated), and the condensing position of the excitation light can be adjusted with high accuracy. Further, in the configuration of the present invention, a configuration is adopted in which the relative position between the light collecting means and the phosphor is adjusted while the phosphor is disposed, and it is not necessary to remove or re-arrange the phosphor during the adjustment process. . For this reason, adjustment of the condensing position of excitation light does not take time, or a shift | offset | difference does not arise. Therefore, the condensing position of excitation light can be adjusted accurately in a short time. Therefore, the position of the phosphor can be easily adjusted.

In the light source device according to the aspect of the invention, the position adjusting mechanism may change a relative position between the light collecting unit and the phosphor, and may change the first fluorescence with respect to the amount of the first excitation light incident on the phosphor. The first emission efficiency E1 of the phosphor, which is the ratio of the amount of light, and the fluorescence, which is the ratio of the amount of second fluorescence to the amount of second excitation light that is greater than the first amount of excitation light. The relative position between the condensing means and the phosphor may be adjusted based on the position where the luminous efficiency ratio E1 / E2 of the phosphor, which is the ratio with the second luminous efficiency E2 of the body, is the largest. .

According to this configuration, the relative position between the light collecting means and the phosphor is adjusted by the position adjustment mechanism based on the position at which the light emission efficiency ratio is the largest among the phosphor light emission efficiency ratios E1 / E2. That is, the kicked portion can be eliminated, and the condensing position of the excitation light can be adjusted with high accuracy. By using the luminous efficiency of the phosphor, adjustment can be performed without being affected by fluctuations in the amount of excitation light, and the position of the phosphor can be easily adjusted.

In the light source device of the present invention, the detection device may be configured to be able to advance and retreat with respect to the optical path of the fluorescence emitted from the phosphor.

According to this configuration, when detecting the amount of fluorescent light, the detection device is disposed on the optical path of the fluorescence. When the amount of fluorescent light is not detected (for example, when the light source device is actually used), the detection device Is evacuated out of the optical path of fluorescence. In this configuration, since it is not necessary to attach or remove the detection device, the condensing position of the excitation light can be adjusted in a short time.

In the light source device of the present invention, the excitation light source may be a laser light source array in which a plurality of laser light sources that emit the excitation light are arranged.

According to this configuration, the power of the excitation light source can be improved. For this reason, when the excitation light is incident on the phosphor through the light collecting means, the temperature of the phosphor increases at the focal position of the excitation light, and the amount of fluorescence with respect to the amount of excitation light decreases. Therefore, it is possible to easily adjust the condensing position of the excitation light using a phenomenon in which the amount of fluorescence decreases with respect to the amount of excitation light.

In the light source device of the present invention, the phosphor is formed in an annular shape along the rotation direction of a rotating plate that is rotationally driven, and the excitation of the phosphor is performed by rotationally driving the rotating plate. The portion on which the light is incident may be varied with time.

According to this configuration, once the phosphor is irradiated with excitation light, there is no irradiation time until the next irradiation, so that the temperature rise of the phosphor can be suppressed compared to the case where the phosphor is fixed. it can. In addition, it becomes possible to make the excitation light quantity incident on the phosphor higher than when the phosphor is fixed.
Therefore, it is possible to easily adjust the condensing position of the excitation light using a phenomenon in which the amount of fluorescence decreases with respect to the amount of excitation light.

The projector according to the present invention includes the light source device described above, a light modulation device that modulates light emitted from the light source device according to image information, and a projection optical system that projects the modulated light from the light modulation device as a projection image. And.

According to this projector, since the light source device described above is provided, a projector having excellent display quality can be provided.

It is a schematic diagram which shows the optical system of the projector which concerns on this invention. It is a front view of an excitation light source. It is a side view of the light source device. It is a graph which shows the light emission characteristic of a light source device and a fluorescent substance layer similarly. It is a perspective view of a rotating fluorescent plate. It is a flowchart of the adjustment method of a light source device similarly. It is a graph which shows the relationship between the 1st luminous efficiency of fluorescent substance, and the 2nd luminous efficiency of fluorescent substance. It is a graph which shows the relationship between the relative position of a condensing means and fluorescent substance and the luminous efficiency ratio of fluorescent substance similarly. It is a figure which shows a mode when a detection apparatus detects the light quantity of fluorescence similarly. It is a graph which shows the relationship between the luminous efficiency in the detection area of a detection apparatus, and the luminous efficiency outside the detection area of a detection apparatus similarly. It is a modification of the flowchart of the adjustment method of a light source device.

Embodiments of the present invention will be described below with reference to the drawings. Such an embodiment is:
It shows one aspect of the present invention and is not intended to limit the present invention, and can be arbitrarily modified within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, an actual structure and a scale, a number, and the like in each structure are different.

FIG. 1 is a schematic diagram showing an optical system of a projector 1000 according to the present invention.
As shown in FIG. 1, the projector 1000 includes a light source device 100, a color separation light guide optical system 200, a liquid crystal light modulation device 400R as a light modulation device, a liquid crystal light modulation device 400G, a liquid crystal light modulation device 400B, A dichroic prism 500 and a projection optical system 600 are provided.

The light source device 100 includes an excitation light source 10, a first condenser lens (condenser means) 20, and a rotating fluorescent plate 30.
A collimating optical system 40, a second condenser lens 50, a detecting device SEN, a computing device COM, a rod integrator 60, and a collimating lens 70. On the optical path of the excitation light, the excitation light source 10, the first condensing lens (condensing means) 20, the rotating fluorescent plate 30, the collimating optical system 40, the second condensing lens 50, the detection device SEN, the rod integrator 60, and the parallelization. Lenses 70 are arranged in this order.

FIG. 2 is a front view of the excitation light source 10.
As shown in FIG. 2, the excitation light source 10 is a laser light source array in which laser light sources 12 are arranged on a base 11 in a two-dimensional array (5 in total) in a 5 × 5 square shape.

The excitation light source 10 emits blue (emission intensity peak: about 445 nm, see FIG. 4A) laser light as excitation light for exciting a fluorescent material included in the rotating fluorescent plate 30 described later.
The excitation light source 10 is configured to be able to change the amount of excitation light. For example, the excitation light source 10 is
A first light amount of excitation light is emitted, and a second light amount of excitation light that is greater than the first light amount is emitted. The excitation light source 10 may be an excitation light source that emits colored light having a peak wavelength other than 445 nm as long as it is light having a wavelength that can excite a fluorescent substance to be described later.

The 1st condensing lens 20 consists of convex lenses, for example. The first condenser lens 20 is an excitation light source 1.
It is arranged on the beam axis of the laser light emitted from 0 and collects the excitation light (a plurality of laser lights) emitted from the excitation light source 10.

FIG. 5 is a perspective view of the rotating fluorescent plate 30.
The rotating fluorescent plate 30 is a so-called transmission type rotating fluorescent plate. As shown in FIGS. 1 and 5, the rotating fluorescent plate 30 is formed with a single phosphor 32 along the rotation direction of the rotating plate 31 that is rotationally driven by a motor 33. The region where the phosphor 32 is formed includes a region where excitation light is incident. By rotating the rotating plate 31, the portion of the phosphor 32 where the excitation light is incident is temporally varied. The rotating fluorescent plate 30 emits red light and green light toward the side opposite to the side on which excitation light (blue light) is incident.

The rotating fluorescent plate 30 rotates at 7500 rpm when in use. Although the detailed description is omitted, the diameter of the rotating fluorescent plate 30 is 50 mm, and the optical axis of the excitation light incident on the rotating fluorescent plate 30 is located at a position about 22.5 mm away from the rotation center of the rotating fluorescent plate 30. ing. That is, the rotating fluorescent plate 30 rotates at such a rotational speed that the excitation light condensing spot moves on the phosphor 32 at about 18 m / sec.

The rotating plate 31 is made of a material that transmits excitation light. In this embodiment, a disc is used as the rotating plate, but the shape is not limited to the disc. As a material of the rotating plate 31, for example,
Quartz glass, crystal, sapphire, optical glass, transparent resin, or the like can be used. Laser light emitted from the excitation light source 10 enters the rotating fluorescent plate 30 as excitation light from the rotating plate 31 side.

The phosphor 32 has phosphor particles that emit fluorescence, and has a function of absorbing excitation light (blue light) and converting it into yellow (emission intensity peak: about 550 nm, see FIG. 4B) fluorescence. Have.
4B is a color light component that can be used as red light in the yellow light emitted from the phosphor 32, and the component indicated by G can be used as green light in the same manner. Color light component. In FIG. 1, red light is indicated by a symbol R, and green light is indicated by a symbol G.

The phosphor particles are particulate fluorescent materials that absorb excitation light emitted from the excitation light source 10 shown in FIG. 1 and emit fluorescence. For example, the phosphor particles include a substance that emits fluorescence when excited by blue light having a wavelength of about 445 nm, and a part of the excitation light is converted into light including from the red wavelength band to the green wavelength band. Convert and inject.

As the phosphor particles, commonly known YAG (yttrium, aluminum, garnet) phosphors can be used. For example, (Y, Gd) ₃ (Al
, Ga) ₅ O ₁₂ : Ce can be used. In addition,
The phosphor particle forming material may be one kind, or a mixture of particles formed using two or more kinds of forming materials may be used as the phosphor particles.

FIG. 3 is a side view of the light source device 100. In FIG. 3, for the sake of convenience, the excitation light source 1
The configuration from 0 to the collimating optical system 40 is illustrated, and the configuration after the detection device SEN is not shown.

As shown in FIG. 3, a first position adjusting mechanism 34 is attached to the end of the rotating plate 31 of the rotating fluorescent plate 30. As the first position adjusting mechanism 34, for example, a micrometer can be used. The first position adjusting mechanism 34 includes the first condenser lens 20 and the rotating fluorescent plate 30 (phosphor 3
2) It has a function of adjusting the relative position to. Further, the first position adjusting mechanism 34 changes the relative position between the first condenser lens 20 and the phosphor 32, and the position where the luminous efficiency ratio E1 / E2 of the phosphor 32 obtained by the arithmetic unit COM is the largest. The relative position between the first condenser lens 20 and the phosphor 32 is adjusted. The luminous efficiency ratio E1 / E2 will be described later.

In the present embodiment, the excitation light source 10 and the first condenser lens 20 are fixed to the stage ST. On the other hand, the rotating fluorescent plate 30 and the collimating optical system 40 are connected, and when the first position adjusting mechanism 34 is driven, the rotating fluorescent plate 30 and the collimating optical system 40 are moved along the optical axis of the excitation light (or the stage ST). Along the top surface). Thus, when the first position adjustment mechanism 34 is driven, the relative position between the first condenser lens 20 and the phosphor 32 is adjusted.

In addition, the structure by which the relative position of the 1st condensing lens 20 and the fluorescent substance 32 is adjusted is not restricted to this, The 1st condensing lens 20 is moved, fixing the rotating fluorescent plate 30 to the stage ST, and 1st collection. The relative position between the optical lens 20 and the phosphor 32 may be adjusted, or both the rotating fluorescent plate 30 and the first condenser lens 20 are moved to move the first condenser lens 20 and the phosphor 32. The relative position may be adjusted.

The collimating optical system 40 is disposed on the optical path of light (excitation light and fluorescence) between the rotating fluorescent plate 30 and the second condenser lens 50. The collimating optical system 40 includes a first lens 41 that suppresses the spread of light from the rotating fluorescent plate 30 and a second lens that collimates light incident from the first lens 41.
The lens 42 is comprised. The first lens 41 is made of, for example, a convex meniscus lens, and the second lens 42 is made of, for example, a convex lens. The collimating optical system 40 causes the light from the rotating fluorescent plate 30 to enter the second condenser lens 50 in a substantially parallel state.

The first lens 41 and the second lens 42 are fixed to the base portion 43. Base part 43
A second position adjusting mechanism 44 is attached to the end of the first position adjusting mechanism. As the second position adjusting mechanism 44, for example, a micrometer can be used. The second position adjusting mechanism 44 has a function of adjusting the relative position between the rotating fluorescent plate 30 (phosphor 32) and the collimating optical system 40.

In the present embodiment, the rotating fluorescent plate 30 and the collimating optical system 40 are connected,
When the second position adjusting mechanism 44 is driven, only the collimating optical system 40 moves along the optical axis of the excitation light. At this time, the rotating fluorescent screen 30 is not moved. This
When the second position adjusting mechanism 44 is driven, the relative position between the phosphor 32 and the collimating optical system 40 is adjusted.

Returning to FIG. 1, the second condenser lens 50 is composed of, for example, a convex lens. The second condenser lens 50 is disposed on the light axis of the light that passes through the collimating optical system 40 (second lens 42), and condenses the light that has passed through the collimating optical system 40.

The detection device SEN is disposed at the condensing position of the light transmitted through the second condensing lens 50. The detection device SEN is configured to be movable back and forth with respect to the optical path of the fluorescence emitted from the phosphor 32. Specifically, the detection device SEN is arranged on the optical path of the fluorescence when detecting the light amount of the fluorescence emitted from the phosphor 32, and on the other hand when not detecting the light amount of the fluorescence emitted from the phosphor 32, It is evacuated outside the optical path of fluorescence. The detection device SEN can use a light receiving sensor (for example, a light receiving element) having a light receiving surface on the phosphor 32 side.
The detection device SEN detects the amount of fluorescent light emitted from the phosphor 32.

The arithmetic unit COM is electrically connected to the detection device SEN and the excitation light source 10. The arithmetic unit COM calculates the ratio of the fluorescence light amount to the excitation light incident on the phosphor 32 based on the excitation light incident on the phosphor 32 and the fluorescence light amount detected by the detection device SEN. It has a function for obtaining luminous efficiency. For example, the arithmetic unit COM has a first incident on the phosphor 32.
The first light emission efficiency E1 of the phosphor 32 is calculated by calculating the ratio of the fluorescence light quantity to the excitation light of the second light quantity, and the fluorescence light quantity of the second light quantity excitation light having a light quantity larger than the first light quantity. The second luminous efficiency E2 of the phosphor 32 is obtained by calculating the ratio. Then, the ratio of the first luminous efficiency E1 of the phosphor and the second luminous efficiency E2 of the phosphor is calculated to obtain the luminous efficiency ratio E1 / E of the phosphor 32.
2 is determined.

The light transmitted through the second condenser lens 50 is incident on one end side of the rod integrator 60. The rod integrator 60 is a prismatic optical member extending in the direction of the optical path. The light transmitted through the inside of the rod integrator 60 is subjected to multiple reflection, thereby mixing the light transmitted through the second condenser lens 50 and adjusting the luminance distribution. It is to make it uniform. The cross-sectional shapes orthogonal to the optical path direction of the rod integrator 60 are the liquid crystal light modulation device 400R, the liquid crystal light modulation device 400G, and the liquid crystal light modulation device 40.
It is substantially similar to the outer shape of the 0B image forming area.

The light emitted from the other end side of the rod integrator 60 is collimated by the collimating lens 70 and emitted from the light source device 100.

The color separation light guide optical system 200 includes a dichroic mirror 210 and a dichroic mirror 22.
0, reflection mirror 230, reflection mirror 240, reflection mirror 250, and relay lens 260
It has. The color separation light guide optical system 200 separates light from the light source device 100 into red light, green light, and blue light, and each color light of red light, green light, and blue light is an illumination target liquid crystal light modulation device 400R. The liquid crystal light modulation device 400G and the liquid crystal light modulation device 400B have a function of guiding light.

The dichroic mirror 210 and the dichroic mirror 220 are mirrors in which a wavelength selective transmission film that reflects light in a predetermined wavelength region and transmits light in another wavelength region is formed on a substrate. Specifically, the dichroic mirror 210 transmits a blue light component and reflects a red light component and a green light component. The dichroic mirror 220 reflects the green light component,
The red light component is transmitted.

The reflection mirror 230, the reflection mirror 240, and the reflection mirror 250 are mirrors that reflect incident light. Specifically, the reflection mirror 230 reflects the blue light component transmitted through the dichroic mirror 210. The reflection mirror 240 and the reflection mirror 250 reflect the red light component transmitted through the dichroic mirror 220.

The blue light transmitted through the dichroic mirror 210 is reflected by the reflection mirror 230 and enters the image forming area of the liquid crystal light modulation device 400B for blue light. Dichroic mirror 210
The green light reflected by is further reflected by the dichroic mirror 220 and enters the image forming area of the liquid crystal light modulation device 400G for green light. The red light transmitted through the dichroic mirror 220 is reflected on the incident-side reflection mirror 240, the relay lens 260, and the emission-side reflection mirror 250.
Then, the light enters the image forming area of the liquid crystal light modulation device 400R for red light.

As the liquid crystal light modulation device 400R, the liquid crystal light modulation device 400G, and the liquid crystal light modulation device 400B, commonly known devices can be used. For example, the liquid crystal light modulation device 400G includes the liquid crystal element 410 and the polarizing elements 420 and 430 that sandwich the liquid crystal element 410. The light modulation device such as a transmissive liquid crystal light valve is used. For example, the polarizing elements 420 and 430 have a configuration in which the transmission axes are orthogonal to each other (crossed Nicols arrangement).

The liquid crystal light modulation device 400R, the liquid crystal light modulation device 400G, and the liquid crystal light modulation device 400B modulate the incident color light according to image information to form a color image.
0 illumination target. The liquid crystal light modulation device 400R, the liquid crystal light modulation device 400G, and the liquid crystal light modulation device 400B perform light modulation of each incident color light.

For example, the liquid crystal light modulator 400R, the liquid crystal light modulator 400G, and the liquid crystal light modulator 400B
Is a transmission type liquid crystal light modulation device in which liquid crystal is hermetically sealed in a pair of transparent substrates, and one type of light emitted from the incident side polarizing plate 420 according to a given image signal using a polysilicon TFT as a switching element. The polarization direction of the linearly polarized light is modulated.

The cross dichroic prism 500 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the emission side polarizing plate 430. The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded. A dielectric multilayer film is formed on the substantially X-shaped interface to which the right-angle prism is bonded. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, red light and blue light are bent and aligned with the traveling direction of green light,
Three colored lights are combined.

The color image emitted from the cross dichroic prism 500 is output from the projection optical system 600.
Is enlarged and projected to form an image on the screen SCR.

(Adjustment method of light source device)
FIG. 6 is a flowchart of a method for adjusting the light source device.

First, excitation light of a first light quantity emitted from the excitation light source 10 is condensed by the first condenser lens 20 and is incident on the rotating fluorescent plate 30 (phosphor 32) (step S1, first step). Next, the detection device SEN is disposed on the optical path of the fluorescence emitted from the phosphor 32.

The first amount of light is such that when the phosphor 32 is disposed at the focal position of the first condenser lens 20, the luminous efficiency is slightly reduced due to the temperature rise or the light saturation phenomenon of the phosphor 32 due to excitation light. Is the amount of light. For example, the light quantity of the first light quantity is about 2W.

Next, the relative position between the first condenser lens 20 and the phosphor 32 is changed, and the amount of fluorescence emitted from the phosphor 32 upon receiving the first amount of excitation light for each changed relative position is detected. Detection is performed by SEN (step S2, second step). For each changed relative position, the phosphor 3
The first light emission efficiency E1 of the phosphor 32 is obtained by calculating the ratio of the amount of fluorescence to the first amount of excitation light incident on 2 (step S3). The drive current and the like are adjusted in advance so that the light amount of the excitation light becomes a predetermined light amount, but it may be detected by a detection device (not shown) as necessary.

In step S1 to step S2, the excitation light source 10 is pulse-driven to intermittently emit the first amount of excitation light from the excitation light source 10. In addition, the rotating fluorescent plate 30 is rotated, and the portion of the phosphor 32 where the first excitation light is incident is temporally varied.

Next, the second amount of excitation light emitted from the excitation light source 10 is condensed by the first condenser lens 20 and is incident on the rotating fluorescent plate 30 (phosphor 32) (step S4, third step). In the third step, laser light is emitted as a second amount of excitation light from a plurality of laser light sources 12 constituting the excitation light source 10.

The second light quantity is a quantity of light that causes a decrease in luminous efficiency due to a temperature rise or a light saturation phenomenon of the phosphor 32 due to excitation light when the phosphor 32 is disposed at the focal position of the first condenser lens 20. . For example, the amount of light used when adjusting the focal position is about 30 W (about the same as the amount of light used when actually used as a light source device mounted on a projector).

Next, the relative position between the first condenser lens 20 and the phosphor 32 is changed, and the amount of fluorescence emitted from the phosphor 32 upon receiving the second amount of excitation light for each changed relative position is detected. Detection is performed by SEN (step S5, fourth step). For each changed relative position, the phosphor 3
The second light emission efficiency E2 of the phosphor 32 is obtained by calculating the ratio of the fluorescence light amount to the excitation light of the second light amount incident on 2 (step S6). The drive current and the like are adjusted in advance so that the light amount of the excitation light becomes a predetermined light amount, but it may be detected by a detection device (not shown) as necessary.

In step S3 to step S4, the excitation light source 10 is pulse-driven and the excitation light of the second light quantity is intermittently emitted from the excitation light source 10. Further, the rotating fluorescent plate 30 is rotated, and the portion of the phosphor 32 where the second excitation light is incident is temporally varied.

Next, for each changed relative position, the ratio of the first luminous efficiency E1 of the phosphor 32 and the second luminous efficiency E2 of the phosphor 32 is calculated to obtain the luminous efficiency ratio E1 / E2 of the phosphor 32 ( Step S
7).

Next, the relative position between the first condenser lens 20 and the phosphor 32 is adjusted to the position where the luminous efficiency is the highest among the luminous efficiency ratios E1 / E2 of the phosphors 32 obtained for each changed relative position. (Step S8, fifth step).

Next, the detection device SEN is retracted out of the optical path of the fluorescence emitted from the phosphor 32. next,
The first position adjusting mechanism 34 is removed, and the rotating fluorescent plate 30 and the collimating optical system 40 are fixed to the stage ST with an adhesive or the like.
The adjustment of the light source device is completed through the above steps.

The luminous efficiency of the phosphor obtained by dividing the light intensity of the fluorescence by the light intensity of the excitation light is affected by a rise in temperature (temperature quenching phenomenon) and a decrease in the number density of the absorption level when the light intensity of the excitation light increases ( It may decrease due to light saturation phenomenon). In the present invention, such a phenomenon is actively used to detect the condensing position of the excitation light.

FIG. 7 is a graph showing the relationship between the first light emission efficiency E1 (low power) of the phosphor 32 and the second light emission efficiency E2 (high power) of the phosphor 32. In FIG. 7, the horizontal axis indicates the focus, and the vertical axis indicates the luminous efficiency relative ratio.
FIG. 8 shows the relative position between the first condenser lens 20 and the phosphor 32 and the luminous efficiency ratio E1 of the phosphor 32.
It is a graph which shows the relationship with / E2.

The focus is the distance between the first condenser lens 20 and the phosphor 32 when the focal position is used as a reference. For example, the positive and negative signs indicate that the phosphor 32 is placed on the first condenser lens 20 with reference to the focal position.
It is negative when the lens is moved closer to, and positive when the phosphor 32 is moved away from the second condenser lens 20. Further, the luminous efficiency relative ratio is a ratio of luminous efficiency for each changed relative position when the focal position is used as a reference. That is, it is a value obtained by dividing the luminous efficiency obtained for each changed relative position by the luminous efficiency at the focal position (that is, the relative ratio of luminous efficiency at the focal position is 1).

Also, the low power luminous efficiency relative ratio is equal to the high power luminous efficiency relative ratio at the focal position.
The first luminous efficiency E1 obtained for each changed relative position is divided by the luminous efficiency E2 at the focal position. The high power luminous efficiency relative ratio is a value obtained by dividing the second luminous efficiency E2 obtained for each changed relative position by the luminous efficiency E2 at the focal position.

As shown in FIG. 7, the low power luminous efficiency relative ratio is larger than the high power luminous efficiency relative ratio, and the value hardly changes for each changed relative position. On the other hand, the high power luminous efficiency relative ratio changes greatly for each changed relative position.

The relative position between the first condenser lens 20 and the phosphor 32 is changed by the first position adjustment mechanism 34, and the light emission efficiency ratio E1 / E2 of the phosphor 32 is set to the position where the light emission efficiency ratio E1 / E2 becomes the largest (the high power light emission efficiency relative ratio). The relative position between the first condenser lens 20 and the phosphor 32 is adjusted.

Here, when the light emission efficiency is the highest among the light emission efficiency ratios E1 / E2 of the phosphors 32 determined for each changed relative position, the light intensity is almost the lowest among the second fluorescent light amounts V2. equal. Thereby, when measuring in the range close | similar to a focus position, it can also be judged that the position where the light quantity V2 of 2nd fluorescence becomes the minimum is a focus position.

However, in the process of changing the relative position between the first condenser lens 20 and the phosphor 32, the fluorescence emitted from the phosphor 32 does not completely enter the region where the amount of fluorescence is detected (the detection region of the detection device SEN). There is a case (fluorescence leaks outside the detection region).

FIG. 9 is a diagram illustrating a state when the detection device SEN detects the amount of fluorescent light. FIG.
) Shows a case where fluorescence enters the detection region of the detection device SEN, and FIG.
The case where the fluorescence does not enter the N detection region is shown.

FIG. 10 is a graph showing the relationship between the light emission efficiency in the detection region of the detection device SEN and the light emission efficiency outside the detection region of the detection device SEN.

As shown in FIG. 10, when the fluorescence enters the detection region of the detection device SEN, the light emission efficiency at the low power becomes a substantially constant value, and the light emission efficiency at the high power becomes the smallest at the focal position. On the other hand, when the fluorescence does not enter the detection region of the detection device SEN, the light emission efficiency detected at the time of low power gradually decreases as the detection region deviates from the detection region. Further, as the light emission efficiency at the time of high power shifts out of the detection area, the light emission efficiency rises due to the increase in the light emission efficiency (CA part shown in FIG. 10) due to the defocusing and the part that does not fully enter the detection area. A decrease (the portion of CB shown in FIG. 10) occurs.

In the process of changing the relative position between the light collecting means and the phosphor, if only one fluorescent light quantity is used, the kicked portion cannot be eliminated. For example, when there is a portion with the smallest amount of fluorescent light outside the detection area, the focal position is calculated without considering the amount of fluorescent light outside the detection area where kicking has occurred. There is a possibility that the light condensing position cannot be accurately adjusted. On the other hand, in the method of the present embodiment, by using two amounts of excitation light, the light emission efficiency of the part where the fluorescence does not enter the detection region (the light emission efficiency outside the detection region shown in FIG. 10) is offset (kicked). Is eliminated). For this reason, the condensing position of excitation light can be adjusted accurately.

According to the adjustment method of the light source device of the present embodiment, the luminous efficiency ratio E of the phosphor 32 for each relative position.
The first condenser lens 20 and the phosphor 3 are positioned at the position where the luminous efficiency ratio becomes the largest of 1 / E2.
2 is adjusted. That is, the relative position between the first condenser lens and the phosphor 32 is adjusted while eliminating the kicked portion. Since the position where the fluorescent light amount becomes the smallest with respect to the excitation light amount of the phosphor 32 is the excitation light condensing position, the phosphor 32 is positioned based on the position where the ratio of the fluorescent light amount to the excitation light amount is the largest. Thus, the phosphor 32 can be disposed at a desired position based on the focal position of the excitation light. Further, in the method of the present invention, a method of adjusting the relative position between the first condenser lens 20 and the phosphor 32 while the phosphor 32 is arranged is adopted, and the phosphor 32 is removed or arranged in the adjustment process. There is no need to For this reason, adjustment of the condensing position of excitation light does not take time, or a shift | offset | difference does not arise. Therefore, the condensing position of excitation light can be adjusted accurately in a short time. Therefore, the position of the phosphor can be easily adjusted. If the phosphor 32 is disposed at the position where the excitation light is condensed, the light emission area can be reduced, and the performance as the light source device can be improved.

Further, according to this method, the first light amount is emitted due to the temperature rise or the light saturation phenomenon of the phosphor 32 due to the excitation light when the phosphor 32 is disposed at the focal position of the first condenser lens 20. The amount of light is such that the efficiency is hardly reduced. For this reason, when the excitation light is incident on the phosphor 32 via the first condenser lens 20, the luminous efficiency of the phosphor 32 decreases due to the temperature rise and light saturation of the phosphor 32 at the focal position of the excitation light. By utilizing such a phenomenon, it is possible to easily adjust the condensing position of the excitation light.

Further, according to this method, since the laser light is emitted as the second amount of excitation light from the plurality of laser light sources 12 constituting the excitation light source 10, the power of the excitation light source 10 can be improved. For this reason, when the excitation light is incident on the phosphor 32 via the first condenser lens 20, the luminous efficiency of the phosphor 32 decreases due to the temperature rise and light saturation of the phosphor 32 at the focal position of the excitation light. By utilizing such a phenomenon, it is possible to easily adjust the condensing position of the excitation light.

Further, according to this method, since the excitation light source 10 is driven in pulses, there is a time during which the phosphor 32 is not irradiated. Therefore, it is possible to make the amount of excitation light incident on the phosphor 32 compared to when the excitation light source 10 is continuously driven. Therefore, it is possible to easily adjust the condensing position of the excitation light using the phenomenon that the luminous efficiency of the phosphor 32 is lowered.

Further, according to this method, since the rotating fluorescent plate 30 is rotated, once the phosphor 32 is irradiated with the excitation light, there is a non-irradiation time until the next irradiation. Therefore, it is possible to make the excitation light quantity incident on the phosphor 32 higher than when the phosphor 32 is fixed. Therefore, it is possible to easily adjust the condensing position of the excitation light using the phenomenon that the luminous efficiency of the phosphor 32 is lowered.

According to the light source device of the present embodiment, the calculation device COM calculates the ratio between the first light emission efficiency E1 of the phosphor 32 and the second light emission efficiency E2 of the phosphor 32 for each relative position. For this reason,
It is possible to cancel the light amount of the fluorescence in the portion where the fluorescence does not completely enter the detection region of the detection device SEN (to eliminate the so-called kicked portion), and to adjust the condensing position of the excitation light with high accuracy. Further, the first position adjusting mechanism 34 causes the first light collection to be performed at a position where the ratio of the first light emission efficiency E1 of the phosphor 32 and the second light emission efficiency E2 of the phosphor 32 is the largest for each relative position. Lens 20 and phosphor 32
Relative position is adjusted. That is, the kicked portion can be eliminated, and the condensing position of the excitation light can be adjusted with high accuracy. Further, in the configuration of the present invention, a configuration is adopted in which the relative position between the first condenser lens 20 and the phosphor 32 is adjusted while the phosphor 32 is disposed, and the phosphor is removed or disposed again during the adjustment process. There is no need to For this reason, adjustment of the condensing position of excitation light does not take time, or a shift | offset | difference does not arise. Therefore, the condensing position of excitation light can be adjusted accurately in a short time. Therefore, the position of the phosphor can be easily adjusted.

Further, according to this configuration, when detecting the light amount of the phosphor 32, the detection device SEN is arranged on the fluorescent light path and does not detect the light amount of the phosphor 32 (for example, the light source device 100 is actually used). The detection device SEN is retracted out of the optical path of the fluorescence. In this configuration, since it is not necessary to attach or remove the detection device SEN, the condensing position of the excitation light can be adjusted in a short time.

According to this configuration, since the excitation light source 10 is a laser light source array, the excitation light source 1
The power of 0 can be improved. For this reason, when the excitation light is incident on the phosphor 32 via the first condenser lens 20, the luminous efficiency of the phosphor 32 decreases due to the temperature rise and light saturation of the phosphor 32 at the focal position of the excitation light. By utilizing such a phenomenon, it is possible to easily adjust the condensing position of the excitation light.

In addition, according to this configuration, the portion of the phosphor 32 where the excitation light is incident fluctuates with time, so that the temperature rise of the phosphor 32 can be suppressed as compared with the case where the phosphor is fixed. Also,
It becomes possible to make the excitation light amount incident on the phosphor 32 higher than when the phosphor is fixed. Therefore,
It is possible to easily adjust the condensing position of the excitation light using a phenomenon in which the amount of fluorescence decreases with respect to the amount of excitation light.

According to the projector 1000 of this embodiment, since the light source device 100 described above is provided, it is possible to provide the projector 1000 with excellent display quality.

In the light source device adjustment method of the present embodiment, the first fluorescence light amount is obtained for each relative position changed in the second step, and the second fluorescence light amount is obtained for each relative position changed in the fourth step. In the fifth step, the relative position between the first condenser lens 20 and the phosphor 32 is set at the position where the light emission efficiency ratio becomes the largest among the light emission efficiency ratios E1 / E2 of the phosphors 32 for each relative position. Although it is adjusted, it is not limited to this.

  FIG. 11 is a modification of the flowchart of the adjustment method of the light source device.

First, excitation light of a first light quantity emitted from the excitation light source 10 is condensed by the first condenser lens 20 and is incident on the rotating fluorescent plate 30 (phosphor 32) (step S1A, first step).
Next, the detection device SEN is disposed on the optical path of the fluorescence emitted from the phosphor 32.

The first amount of light is such that when the phosphor 32 is disposed at the focal position of the first condenser lens 20, the luminous efficiency is slightly reduced due to the temperature rise or the light saturation phenomenon of the phosphor 32 due to excitation light. Is the amount of light. For example, the light quantity of the first light quantity is about 2W.

Next, the amount of fluorescent light emitted from the phosphor 32 upon receiving the first amount of excitation light is detected by the detection device S.
It detects by EN (step S2A, 2nd process).

Next, the second amount of excitation light emitted from the excitation light source 10 is condensed by the first condenser lens 20 and is incident on the rotating fluorescent plate 30 (phosphor 32) (step S4A, third step).
In the third step, laser light is emitted as a second amount of excitation light from a plurality of laser light sources 12 constituting the excitation light source 10.

The second light quantity is a quantity of light that causes a decrease in luminous efficiency due to a temperature rise or a light saturation phenomenon of the phosphor 32 due to excitation light when the phosphor 32 is disposed at the focal position of the first condenser lens 20. . For example, the amount of light used when adjusting the focal position is about 30 W (about the same as the amount of light used when actually used as a light source device mounted on a projector).

Next, the amount of fluorescence emitted from the phosphor 32 in response to the second amount of excitation light is detected by the detection device S.
It detects by EN (step S5A, 4th process).

In step S1A to step S2A and step S3A to step S4A,
The excitation light source 10 is pulse-driven, and a second amount of excitation light is intermittently emitted from the excitation light source 10. Further, the rotating fluorescent plate 30 is rotated, and the portion of the phosphor 32 where the second excitation light is incident is temporally varied. Further, laser light having a constant intensity is emitted as excitation light from a plurality of laser light sources 12 constituting the excitation light source 10.

Next, for each changed relative position, the first fluorescence light amount V1 of the phosphor 32 and the second of the phosphor 32.
Is calculated to obtain a fluorescence light amount ratio V1 / V2 of the phosphor 32 (step S7A).

Next, the relative position between the first condenser lens 20 and the phosphor 32 is set to the position at which the light amount ratio becomes the largest among the fluorescence light amount ratios V1 / V2 of the phosphors 32 obtained for each changed relative position. Adjust (step S8A, fifth step).

According to this method, the fluorescence light amount ratio V1 of the phosphor 32 obtained for each changed relative position.
The relative position between the first condenser lens 20 and the phosphor 32 is adjusted to the position where the light quantity ratio becomes the largest in / V2. That is, when the amount of excitation light is constant, the change in luminous efficiency has a correlation with the change in the amount of fluorescent light. Therefore, since the position where the light quantity of fluorescence is the smallest is the condensing position of the excitation light, by positioning the phosphor 32 at the position where the light quantity of fluorescence is the smallest,
The phosphor 32 can be disposed at the focal position of the excitation light. Further, by using two light amounts of excitation light, the light amount of the portion where the fluorescence does not enter the detection region is canceled (so-called kicked portion is eliminated). For this reason, the condensing position of excitation light can be adjusted accurately.

Moreover, in the adjustment method of the light source device of the present embodiment, the phosphor 32 is irradiated with excitation light having a light amount larger than the light amount actually used as the light source as the excitation light, and the first condenser lens 20 and the phosphor 32. The relative position may be adjusted. For example, the amount of light used when adjusting the focal position is 45
Set to about W.

According to this method, the decrease in the amount of fluorescent light with respect to the amount of excitation light of the phosphor is increased, so that the measurement accuracy is improved.

Moreover, in the adjustment method of the light source device of the present embodiment, laser light is emitted as excitation light from the plurality of laser light sources 12 constituting the excitation light source 10 in the first step, but is not limited thereto. For example, the laser light may be emitted using a light source (another light source) other than the laser light source 12 constituting the excitation light source 10.

In the light source device adjustment method of the present embodiment, the excitation light source 10 is pulse-driven in the second step and the fourth step, and the excitation light is intermittently emitted from the excitation light source 10. Not exclusively. For example, in the second step and the fourth step, the excitation light source 10 may be continuously driven so that the excitation light is continuously emitted from the excitation light source 10.

Moreover, in the adjustment method of the light source device of this embodiment, although the part into which the excitation light of the fluorescent substance 32 injects is temporally changed in the 2nd process and the 4th process, it is not restricted to this. For example, in the second step and the fourth step, the portion of the phosphor 32 where the excitation light is incident may be fixed.

Moreover, in the adjustment method of the light source device of this embodiment, although it has adjusted so that the fluorescent substance 32 may be arrange | positioned in the condensing position of excitation light, it is not restricted to this. For example, in consideration of the characteristics of the entire optical system of the device including the light source device, the phosphor 32 may be arranged at a position shifted by a predetermined distance from the excitation light condensing position. In this case, the condensing position of the excitation light is first obtained, then the position where the phosphor 32 is to be arranged is obtained with reference to the condensing position, and the phosphor 32 is arranged at a desired position. Even in this case, since the condensing position of the excitation light can be easily obtained, the phosphor 32 based thereon can be obtained.
Can be easily adjusted.

Moreover, in the adjustment method of the light source device of the present embodiment, the relative position between the first condenser lens 20 and the phosphor 32 is changed, and the phosphor 32 receives the first amount of excitation light for each changed relative position. The amount of fluorescent light emitted from the first detection lens SEN is detected by the detection device SEN, the relative position between the first condenser lens 20 and the phosphor 32 is changed, and the second light quantity of excitation light is received for each changed relative position to emit fluorescence. Although the amount of fluorescence emitted from the body 32 is detected by the detection device SEN, the present invention is not limited to this. First
The relative position between the condenser lens 20 and the phosphor 32 is changed, and the amount of fluorescent light emitted from the phosphor 32 upon receiving the first amount of excitation light for each changed relative position is detected by the detection device SEN,
The light amount of the excitation light may be changed while the relative position remains unchanged, and the light amount of the fluorescence emitted from the phosphor 32 upon receiving the second light amount of the excitation light may be detected by the detection device SEN.

Moreover, in the adjustment method of the light source device of the present embodiment, the ratio of the first luminous efficiency E1 of the phosphor 32 and the second luminous efficiency E2 of the phosphor 32 is calculated for each changed relative position to calculate the phosphor 32. However, the present invention is not limited to this. You may change the relative position measured by the measurement with respect to the excitation light of the 1st light quantity, and the measurement with respect to the excitation light of the 2nd light quantity. In addition, the first luminous efficiency and the second luminous efficiency may be graphed, for example, and the luminous efficiency ratio may be obtained from the first luminous efficiency and the second luminous efficiency at the same relative position.

In the projector 1000 of this embodiment, three liquid crystal light modulation devices are used as the liquid crystal light modulation device, but the present invention is not limited to this. The present invention can also be applied to a projector using one, two, four or more liquid crystal light modulation devices.

In the projector 1000 of the present embodiment, a transmissive projector is used, but the present invention is not limited to this. For example, a reflective projector may be used. Here, “transmission type” means that the light modulation device as the light modulation means is a type that transmits light, such as a transmission type liquid crystal display device. The “reflective type” means that a light modulation device as a light modulation unit, such as a reflection type liquid crystal display device, reflects light. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

The present invention is applicable not only when applied to a front projection type projector that projects from the side that observes the projected image, but also when applied to a rear projection type projector that projects from the side opposite to the side that observes the projected image. can do.

In each of the above embodiments, the example in which the illumination device of the present invention is applied to a projector has been described, but the present invention is not limited to this. For example, the lighting device of the present invention can be applied to other optical devices (for example, an optical disk device, a car headlamp, a lighting device, etc.).

DESCRIPTION OF SYMBOLS 10 ... Excitation light source, 12 ... Laser light source, 20 ... 1st condensing lens (condensing means), 31 ... Rotating plate, 32 ... Phosphor, 34 ... Micrometer (position adjustment mechanism), 100 ... Light source device, 40
0R, 400G, 400B: liquid crystal light modulation device (light modulation device), 600: projection optical system, 100
0 ... Projector, COM ... Calculation device, SEN ... Detection device

Claims (13)

A first step of condensing excitation light of a first light quantity emitted from an excitation light source by a condensing unit and entering the phosphor;
The relative position between the light collecting means and the phosphor is changed, and the first relative position is changed for each changed relative position.
A second step of detecting the amount of the first fluorescence emitted from the phosphor upon receiving the excitation light of the amount of
A third step of condensing a second light amount of excitation light having a light amount larger than the first light amount of excitation light by a condensing means and entering the phosphor;
The relative position between the light collecting means and the phosphor is changed, and the second position is changed for each changed relative position.
A fourth step of detecting the amount of second fluorescent light emitted from the phosphor in response to the excitation light of the amount of
The amount of the first fluorescence with respect to the amount of the first excitation light for each relative position and the second
A fifth step of adjusting the relative position between the light collecting means and the phosphor based on the position at which the light amount ratio is the largest among the ratios of the second fluorescent light to the excitation light;
A method for adjusting a light source device, comprising: In the fifth step, the first incident on the phosphor for each changed relative position.
A first luminous efficiency E1 of the phosphor, which is a ratio of the amount of fluorescence to the excitation light of
The ratio of the fluorescent light quantity to the second luminous efficiency E2 that is the ratio of the fluorescent light quantity to the second quantity of excitation light incident on the fluorescent substance is the luminous efficiency ratio E1 / E2 of the fluorescent substance, The luminous efficiency ratio E1 / E2 of the phosphor is used as a ratio of the first fluorescent light amount with respect to the first excitation light amount and the second fluorescent light amount with respect to the second excitation light amount. The method for adjusting a light source device according to claim 1, wherein a relative position between the light collecting unit and the phosphor is adjusted. The second light amount is reduced in luminous efficiency due to a temperature rise or light saturation phenomenon of the phosphor due to the excitation light of the second light amount when the phosphor is disposed at a focal position of the light collecting means. The method of adjusting a light source device according to claim 1, wherein the light amount is a light amount. 4. The method of adjusting a light source device according to claim 1, wherein laser light is emitted from a plurality of laser light sources constituting the excitation light source as the second amount of excitation light. 5. 5. The light source device according to claim 1, wherein the excitation light of the first light amount and the second light amount is intermittently emitted by driving the excitation light source in pulses. Adjustment method. 6. The light source device according to claim 1, wherein a portion of the phosphor on which the first light amount and the second light amount of the excitation light are incident is varied with time. Adjustment method. 2. The relative position between the condensing means and the phosphor is adjusted by irradiating the phosphor with excitation light having a light amount larger than that actually used as a light source as excitation light.
The light source device adjustment method according to any one of claims 6 to 6. An excitation light source capable of changing the amount of excitation light;
Condensing means for condensing the excitation light emitted from the excitation light source;
A phosphor that emits fluorescence in response to the excitation light collected by the light collecting means;
A detection device for detecting the amount of fluorescence emitted from the phosphor;
The relative position between the condensing means and the phosphor is changed, and the amount of the first fluorescence relative to the amount of the first excitation light incident on the phosphor is greater than the amount of the first excitation light. A position adjustment mechanism that adjusts the relative position between the light collecting means and the phosphor based on the position where the ratio of the second fluorescent light amount to the large second excitation light amount is maximized;
A light source device comprising: The position adjusting mechanism changes a relative position between the light collecting unit and the phosphor, and is a ratio of a light amount of the first fluorescence to a light amount of the first excitation light incident on the phosphor. The first luminous efficiency E1 and the second luminous efficiency E2 of the phosphor, which is the ratio of the second fluorescent light amount to the second exciting light amount that is larger than the first light amount of the exciting light. 9. The light source according to claim 8, wherein the relative position between the light collecting means and the phosphor is adjusted based on a position where the luminous efficiency ratio E1 / E2 of the phosphor is the largest. apparatus. The light source device according to claim 8, wherein the detection device is configured to be capable of moving forward and backward with respect to an optical path of fluorescence emitted from the phosphor. The light source device according to any one of claims 8 to 10, wherein the excitation light source is a laser light source array in which a plurality of laser light sources that emit the excitation light are arranged. The phosphor is formed in an annular shape along the rotation direction of a rotating plate that is driven to rotate,
The light source device according to any one of claims 8 to 11, wherein a portion of the phosphor on which the excitation light is incident is temporally varied by rotationally driving the rotating plate. The light source device according to any one of claims 8 to 12,
A light modulation device that modulates light emitted from the light source device according to image information;
A projection optical system that projects modulated light from the light modulation device as a projection image;
A projector comprising:

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