JP2012220811A - Method for adjusting light source device, light source device, and projector - Google Patents

Method for adjusting light source device, light source device, and projector Download PDF

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JP2012220811A
JP2012220811A JP2011087981A JP2011087981A JP2012220811A JP 2012220811 A JP2012220811 A JP 2012220811A JP 2011087981 A JP2011087981 A JP 2011087981A JP 2011087981 A JP2011087981 A JP 2011087981A JP 2012220811 A JP2012220811 A JP 2012220811A
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light
phosphor
light source
excitation light
amount
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Akihiro Kashiwagi
Akira Miyamae
章 宮前
章宏 柏木
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Seiko Epson Corp
セイコーエプソン株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a method for adjusting light source devices capable of accurately adjusting an arrangement position of a phosphor in a short time, and a light source device.SOLUTION: The method for adjusting light source devices includes: a first step for focusing exciting light emitted from an exciting light source 10 by light focus means 20 and falling it on a phosphor; a second step for changing a relative position of the light focus means 20 to the phosphor and detecting the quantity of fluorescent light radiated from the phosphor for each changed relative position; and a third step for adjusting the relative position of the light focus means 20 to the phosphor based on a position when the quantity of the fluorescent light to the quantity of the exciting light for each changed relative position is minimized.

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, a method for adjusting a light source device according to the present invention includes a first step of condensing excitation light emitted from an excitation light source by a condensing unit and entering the phosphor, and the condensing unit. And the second step of detecting the amount of fluorescence emitted from the phosphor for each changed relative position, and the amount of excitation light for each changed relative position And a third step of adjusting a relative position between the light collecting means and the phosphor based on a position when the amount of fluorescent light is lowest.

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.

According to this method, the relative position between the condensing means and the phosphor is adjusted based on the position at which the amount of fluorescence with respect to the amount of excitation light for each changed relative position is lowest. 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 a 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. Therefore, the position of the phosphor can be easily adjusted. 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 third step, the adjustment method of the light source device according to the present invention is a ratio of the amount of the fluorescence to the excitation light incident on the phosphor, which is obtained for each changed relative position. The light emission efficiency may be used as the amount of fluorescence with respect to the amount of excitation light, and the relative position between the condensing means and the phosphor may be adjusted.

According to this method, the light emission efficiency of the phosphor, which is the ratio of the amount of fluorescence to the excitation light incident on the phosphor determined for each changed relative position, is used as the amount of fluorescence relative to the amount of excitation light. 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 adjustment method of the present invention, the amount of the excitation light may be such that when the phosphor is placed at a focal position of the light collecting means, the phosphor increases in temperature or is saturated by the excitation light. The amount of light that causes a decrease in luminous efficiency due to the above phenomenon may be used.

According to this method, when the excitation light 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 light source device adjustment method of the present invention, laser light may be emitted as the excitation light 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 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 adjustment method of the present invention, the excitation light source may be pulse-driven to intermittently emit excitation light from the excitation light source.

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 the decrease in which the amount of fluorescence decreases with respect to the amount of excitation light.

In the method for adjusting a light source device of the present invention, a portion of the phosphor on which the excitation light is incident may be temporally varied.

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 the decrease 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 includes an excitation light source that emits excitation light, a condensing unit that condenses the excitation light emitted from the excitation light source, and fluorescence that receives the excitation light collected by the condensing unit. Change the relative position of the phosphor to radiate, the amount of fluorescence emitted from the phosphor, the light collecting means and the phosphor, and the amount of fluorescence relative to the amount of excitation light is the lowest And a position adjusting mechanism for adjusting a relative position between the light collecting means and the phosphor based on the position.

According to this configuration, the relative position between the light collecting means and the phosphor is determined based on the position when the light amount is the lowest among the light amounts of the fluorescence with respect to the light amount of the excitation light obtained for each changed relative position by the position adjustment mechanism. The position is adjusted. Since the position where the luminous efficiency of the phosphor becomes the smallest is the excitation light condensing position, positioning the phosphor based on the position where the light quantity is the smallest enables the position to be a desired position based on the focal position of the excitation light. A phosphor can be placed. 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.

Further, in the light source device of the present invention, the light source device includes a calculation device that calculates a light emission efficiency of the phosphor by calculating a ratio of the amount of the fluorescence to the excitation light incident on the phosphor, and the position adjustment mechanism includes:
The relative position between the condensing means and the phosphor may be changed, and the relative position between the condensing means and the phosphor may be adjusted based on the position where the luminous efficiency of the phosphor is lowest.

According to this configuration, the relative position between the light collecting means and the phosphor is determined based on the position at which the light emission efficiency is lowest among the light emission efficiencies of the phosphors determined for each changed relative position by the position adjustment mechanism. Adjusted. Since the position where the emission efficiency of the phosphor is the smallest is the excitation light condensing position, positioning the phosphor based on the position where the emission efficiency is the smallest enables the desired position based on the focal position of the excitation light. A phosphor can be placed. 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. therefore,
The position of the phosphor can be easily adjusted.

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 relative position of a condensing means and fluorescent substance, and the luminous efficiency of fluorescent substance 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.
In addition, if the excitation light source 10 is light having a wavelength that can excite a fluorescent material described later,
An excitation light source that emits colored light having a peak wavelength other than 445 nm may be used.

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. The first position adjustment mechanism 34 changes the relative position between the first condenser lens 20 and the phosphor 32, and the first condenser lens is located at a position where the light emission efficiency (see FIG. 7) of the phosphor 32 is lowest. The relative position of 20 and the phosphor 32 is adjusted.

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.

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, the 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 S1, first step).

The amount of excitation light is smaller than the amount of excitation light less than that of the first condenser lens 2.
This is the amount of light that causes a decrease in light emission efficiency due to a temperature increase or light saturation phenomenon of the phosphor 32 caused by excitation light when it is disposed at a focal position of 0. For example, the light amount used when actually used as a light source device mounted on a projector is about 30 W.

  Next, the detection device SEN is disposed on the optical path of the fluorescence emitted from the phosphor 32.

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 is detected by the detection device SEN for each changed relative position (step S2, second). Process). Then, for each changed relative position, the ratio of the amount of fluorescence to the excitation light incident on the phosphor 32 is calculated to determine the luminous efficiency of the phosphor 32 (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.

Here, the excitation light source 10 is pulse-driven and the 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 excitation light is incident is temporally varied.

Next, the relative position between the first condenser lens 20 and the phosphor 32 is adjusted to the position at which the light emission efficiency is lowest among the light emission efficiencies of the phosphors 32 determined for each changed relative position (step S4). , Third step).

FIG. 7 is a graph showing the relationship between the relative position between the first condenser lens 20 and the phosphor 32 and the luminous efficiency of the phosphor 32. In FIG. 7, the horizontal axis indicates the focus, and the vertical axis indicates the luminous efficiency relative ratio.

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).

The relative position between the first condenser lens 20 and the phosphor 32 is changed by the first position adjusting mechanism 34, and the phosphor 32 has the lowest luminous efficiency (the luminous efficiency relative ratio is 1). ,
The relative position between the first condenser lens 20 and the phosphor 32 is adjusted.

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.

According to the adjustment method of the light source device of the present embodiment, the first condenser lens 20 and the phosphor 32 are located at the positions where the light emission efficiency is lowest among the light emission efficiencies of the phosphors 32 obtained for each changed relative position. Relative position is adjusted. 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 32 irradiated with the excitation light increases, and the amount of fluorescence relative to the amount of excitation light decreases. Therefore, by positioning the phosphor 32 at a position where the amount of fluorescence with respect to the amount of excitation light is minimized, the phosphor 32 can be arranged at the position where the excitation light is condensed. 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. In the method of this embodiment, the phosphor 3
The method of adjusting the relative position between the first condenser lens 20 and the phosphor 32 is employed while 2 is disposed, and it is not necessary to remove or arrange the phosphor in the process of adjustment. 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 32 can be easily adjusted. Furthermore, in the method of the present embodiment, adjustment is performed using the luminous efficiency of the phosphor 32.
By using the light emission efficiency of the phosphor 32, adjustment can be performed without being affected by fluctuations in the amount of excitation light, and the position of the phosphor 32 can be easily adjusted.

Further, according to this method, the light amount of the excitation light is emitted due to the temperature rise of the phosphor 32 due to the excitation light or the phenomenon of light saturation when the phosphor 32 is disposed at the focal position of the first condenser lens 20. This is the amount of light that causes a decrease in efficiency. 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 can be reduced at the focal position of the excitation light. Therefore, adjustment of the condensing position of excitation light becomes easy.

Also, according to this method, since the laser light is emitted as the 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 first condenser lens is positioned at the position where the light emission efficiency is lowest among the light emission efficiencies of the phosphors 32 obtained for each changed relative position by the first position adjustment mechanism 34. The relative position of 20 and the phosphor 32 is adjusted. Since the position where the emission efficiency of the phosphor 32 is the smallest is the excitation light condensing position, the phosphor 32 is arranged at the focal position of the excitation light by positioning the phosphor 32 at the position where the emission efficiency is the smallest. be able to. 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.

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.

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 adjustment method of the light source device of the present embodiment, the amount of fluorescence is calculated for each relative position in the second step, and the luminous efficiency of the luminous efficiency of the phosphor for each relative position changed in the third step is calculated. Although the relative position of the 1st condensing lens 20 and the fluorescent substance 32 is adjusted to the position when it becomes the lowest, it is not restricted to this.

FIG. 8 is a modification of the flowchart of the adjustment method of the light source device.
In FIG. 8, step S1 and step S2 are the same as those in FIG.

Here, laser light having a constant intensity is emitted from a plurality of laser light sources 12 constituting the excitation light source 10 as excitation light.

Next, the relative position between the first condenser lens 20 and the phosphor 32 is adjusted to the position where the light amount is the lowest among the amounts of fluorescence emitted from the phosphor 32 obtained for each changed relative position. (Step S4A, third step).

According to this method, the relative position between the first condenser lens 20 and the phosphor 32 is adjusted to the position at which the light amount becomes the lowest among the fluorescent light amounts obtained for each changed relative position. When the amount of excitation light is constant, the change in light emission efficiency has a correlation with the change in the amount of fluorescence light. Therefore, since the position where the light quantity of fluorescence becomes the smallest is the condensing position of the excitation light, the phosphor 32 is arranged at the focal position of the excitation light by positioning the phosphor 32 at the position where the light quantity of fluorescence is the smallest. be able to.

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 fluorescence with respect to the amount of excitation light 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 a plurality of laser light sources 12 constituting the excitation light source 10, but the present invention is not limited to this. 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.

Moreover, in the adjustment method of the light source device of this embodiment, although the excitation light source 10 is pulse-driven and excitation light is intermittently emitted from the excitation light source 10, it is not limited to this. For example, 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, it is not restricted to this. For example, in the second 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.

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)

  1. A first step of condensing excitation light emitted from the excitation light source by a condensing means and entering the phosphor;
    A second step of changing the relative position between the light collecting means and the phosphor, and detecting the amount of fluorescence emitted from the phosphor for each changed relative position;
    A third step of adjusting the relative position of the light collecting means and the phosphor based on the position at which the amount of fluorescence with respect to the amount of excitation light for each changed relative position is lowest;
    A method for adjusting a light source device, comprising:
  2. In the third step, the luminous efficiency of the phosphor, which is the ratio of the amount of the fluorescence to the excitation light incident on the phosphor determined for each changed relative position, is set to the fluorescence efficiency relative to the amount of the excitation light. The method for adjusting a light source device according to claim 1, wherein the light source device is used as a light amount to adjust a relative position between the light collecting unit and the phosphor.
  3. The light amount of the excitation light is a light amount that causes a decrease in luminous efficiency due to a temperature rise or light saturation phenomenon of the phosphor due to the excitation light 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 source device is adjusted.
  4. The method for adjusting a light source device according to claim 1, wherein laser light is emitted as the excitation light from a plurality of laser light sources constituting the excitation light source.
  5. 5. The method of adjusting a light source device according to claim 1, wherein the excitation light source is pulse-driven and excitation light is intermittently emitted from the excitation light source. 6.
  6. The method for adjusting a light source device according to claim 1, wherein a portion of the phosphor on which the excitation light is incident is varied with time.
  7. 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.
  8. An excitation light source that emits 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;
    A position adjustment mechanism that changes the relative position between the light collecting means and the phosphor, and adjusts the relative position between the light collecting means and the phosphor based on the position where the amount of fluorescence with respect to the amount of excitation light is lowest. When,
    A light source device comprising:
  9. A calculation device for calculating the luminous efficiency of the phosphor by calculating the ratio of the amount of the fluorescence to the excitation light incident on the phosphor;
    The position adjusting mechanism changes a relative position between the light collecting unit and the phosphor, and adjusts a relative position between the light collecting unit and the phosphor based on a position where the luminous efficiency of the phosphor is lowest. The light source device according to claim 8.
  10. 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.
  11. 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.
  12. 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.
  13. 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:
JP2011087981A 2011-04-12 2011-04-12 Method for adjusting light source device, light source device, and projector Withdrawn JP2012220811A (en)

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
JP2014235323A (en) * 2013-06-03 2014-12-15 セイコーエプソン株式会社 Light source device and projector
JP2014238485A (en) * 2013-06-07 2014-12-18 ソニー株式会社 Optical unit, light source device, and image display device
JP2016004051A (en) * 2014-06-13 2016-01-12 株式会社リコー Light source device and projection display device
JP2016161738A (en) * 2015-03-02 2016-09-05 セイコーエプソン株式会社 Light source device, projector, and color balance adjustment method
WO2016167110A1 (en) * 2015-04-14 2016-10-20 ソニー株式会社 Illumination device and projection-type display apparatus
JP2017009684A (en) * 2015-06-18 2017-01-12 カシオ計算機株式会社 Optical wheel device, light source device and projection device, optical wheel device position adjustment method
JPWO2015189947A1 (en) * 2014-06-12 2017-04-20 Necディスプレイソリューションズ株式会社 Light source device and projector
US9876998B2 (en) 2015-02-17 2018-01-23 Seiko Epson Corporation Light source apparatus and projector
US10495271B2 (en) 2017-12-25 2019-12-03 Nichia Corporation Light emitting device and method for detecting abnormality in light emitting device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014235323A (en) * 2013-06-03 2014-12-15 セイコーエプソン株式会社 Light source device and projector
JP2014238485A (en) * 2013-06-07 2014-12-18 ソニー株式会社 Optical unit, light source device, and image display device
US10031405B2 (en) 2014-06-12 2018-07-24 Nec Display Solutions, Ltd. Light source device and projector with reducing optical system having adjustable position for positive power lens
JPWO2015189947A1 (en) * 2014-06-12 2017-04-20 Necディスプレイソリューションズ株式会社 Light source device and projector
JP2016004051A (en) * 2014-06-13 2016-01-12 株式会社リコー Light source device and projection display device
US9876998B2 (en) 2015-02-17 2018-01-23 Seiko Epson Corporation Light source apparatus and projector
JP2016161738A (en) * 2015-03-02 2016-09-05 セイコーエプソン株式会社 Light source device, projector, and color balance adjustment method
WO2016167110A1 (en) * 2015-04-14 2016-10-20 ソニー株式会社 Illumination device and projection-type display apparatus
JP2017009684A (en) * 2015-06-18 2017-01-12 カシオ計算機株式会社 Optical wheel device, light source device and projection device, optical wheel device position adjustment method
US10495271B2 (en) 2017-12-25 2019-12-03 Nichia Corporation Light emitting device and method for detecting abnormality in light emitting device

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