KR20110046341A - Light source unit and projector - Google Patents
Light source unit and projector Download PDFInfo
- Publication number
- KR20110046341A KR20110046341A KR1020100104907A KR20100104907A KR20110046341A KR 20110046341 A KR20110046341 A KR 20110046341A KR 1020100104907 A KR1020100104907 A KR 1020100104907A KR 20100104907 A KR20100104907 A KR 20100104907A KR 20110046341 A KR20110046341 A KR 20110046341A
- Authority
- KR
- South Korea
- Prior art keywords
- light source
- light
- excitation light
- fluorescent wheel
- fluorescent
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
- G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3164—Modulator illumination systems using multiple light sources
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Optics & Photonics (AREA)
- Signal Processing (AREA)
- Astronomy & Astrophysics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Projection Apparatus (AREA)
Abstract
Description
The present invention relates to a light source unit and a projector including the light source unit.
Today, many data projectors are used as image projection apparatuses for projecting a screen, a video image of a personal computer, an image by image data stored in a memory card, or the like onto a screen. The projector condenses the light emitted from the light source to a micromirror display element called a DMD (digital micro mirror device) or a quartz plate to display a color image on the screen.
In such a projector, conventionally, a high brightness discharge lamp is used as a light source, but when a white discharge lamp is used as a light source, colors are separated by a color wheel made of color filters such as red, green, and blue. Since light other than light is blocked, there exists a problem that light utilization efficiency is low. Therefore, in recent years, many projectors using light emitting diodes, laser diodes, organic ELs, phosphors and the like as light sources have been developed.
For example, Japanese Patent Application Laid-open No. 2004-341105 discloses a light emitting diode as an excitation light source and a phosphor layer for converting ultraviolet light emitted from the excitation light source into visible light. Proposal is made about the light source unit which has the fluorescent wheel formed in ().
In addition, Japanese Patent Application Laid-Open No. 2003-295319 discloses a monochromatic light source unit which irradiates laser light from a laser diode as an excitation light source to a phosphor, and emits fluorescent light emitted from the phosphor as parallel light by means of a reflector. Proposals are being made.
The Japanese Patent Application Laid-open No. 2004-341105 proposes a configuration capable of sequentially emitting red, green and blue wavelength band light by rotating a fluorescent wheel, but irradiates excitation light to each color fluorescent light emitting region on the wheel surface. There is a problem in that the load on the excitation light source that is always driven increases. Therefore, it was necessary to suppress the drive output of the excitation light source and to suppress the temperature rise. In addition, since it is configured to sequentially emit each color fluorescent light from the fluorescent light emitting region formed on the fluorescent wheel rotating at a predetermined rotational speed, the period in which each color light is emitted is determined by the fluorescent light emitting region of each color formed on the fluorescent wheel. In the case where it is desired to lengthen the time at which the predetermined wavelength band light is emitted by being limited by the ratio, it is inevitable to adjust by shortening the time at which the other wavelength band light is emitted, and there is also a problem that the utilization efficiency of the light is lowered.
In addition, since the light of each color emitted from the fluorescent light emitting regions of each color largely depends on the physical properties of the phosphor, it is also difficult to uniformly emit light of each color to illuminate an image having excellent color balance on the screen.
And although it can also comprise with the light source unit which has a some kind of semiconductor light emitting element so that all the light of each color may generate | occur | produce it with light emitting diodes, in this case, red and blue semiconductor light emission in which green semiconductor light emitting elements differ, for example. In some cases, it is difficult to obtain high brightness compared to an element.
Further, the monochromatic light source unit of Japanese Patent Application Laid-open No. 2003-295319 provides excitation light even if it is configured to project a color image on the screen by arranging three monochromatic light source units as red, green, and blue light source units in the projector. Since it is fixed so that the phosphor which receives a predetermined wavelength band light does not move, the irradiation position of the excitation light does not change and the temperature of the phosphor rises, thereby reducing the wavelength conversion efficiency due to the rise of the temperature of the phosphor, There has been a problem in that performance deterioration over time.
Here, although each monochromatic light source unit may be comprised by a fluorescent wheel, in this case, the excitation light from time-controlled excitation light irradiation apparatus is various in the phosphor layer laid down in the circumferential direction in the rotating fluorescent wheel. Is investigated on the part. That is, the irradiation position of the excitation light in the phosphor layer becomes sparse, and a portion which is repeatedly irradiated, a portion which is almost irradiated is generated, and deterioration of only a portion of the phosphor layer is promoted, resulting in a decrease in the luminous efficiency of the portion, and the screen Causes flickering of the screen.
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and includes a fluorescent wheel which prevents non-uniformity of deterioration of the phosphor layer and enables long-life and stable fluorescent light emission, and an excitation light for irradiating excitation light to the fluorescent wheel. An object of the present invention is to provide a light source unit having a light irradiation device and a projector provided with the light source unit to prevent flicker on the screen.
The light source unit of the present invention includes an excitation light irradiation device for emitting excitation light, a fluorescent wheel in which a layer of a phosphor that receives excitation light from the excitation light irradiation device and emits fluorescent light of a predetermined wavelength band is placed in the circumferential direction, and And a light source control means for controlling the light emission of the excitation light irradiation apparatus and for controlling the rotational speed of the fluorescent wheel, wherein the light source control means has a constant value of the fluorescent wheel during a period of turning on the excitation light irradiation apparatus. I) controlling the rotation speed of the fluorescent wheel so as to become the rotation speed.
The light source unit of the present invention is configured to emit light from two kinds of light source devices that emit wavelength bands of light different from the fluorescent light emitted from the fluorescent wheel, each of the fluorescent light emitted from the fluorescent wheel and the two kinds of light source devices. The light source side optical system which condenses losing light to a predetermined surface is further included, The said light source control means controls light emission of the said excitation light irradiation apparatus and the said two types of light source apparatuses individually.
Further, the light source control means controls the rotation speed of the fluorescent wheel so that the rotation of the fluorescent wheel becomes an integral rotation speed in the changed lighting period when the lighting period of the excitation light irradiation apparatus is changed. do.
And in this light source unit, the said light source control means controls the rotation speed of the said fluorescent wheel so that the rotation speed of the said fluorescent wheel in the lighting period of the said excitation light irradiation apparatus may be one.
Moreover, in the light source unit of this invention, the said excitation light irradiation apparatus is provided with the excitation light source which emits excitation light of a blue wavelength band, and said two types of light source devices have the semiconductor light emitting element which emits red wavelength band light. And a blue light source device having a red light source device and a semiconductor light emitting device that emits blue wavelength band light, wherein the fluorescent light emitting region of the fluorescent wheel receives the excitation light from the excitation light irradiation device and emits green wavelength band light. It features.
Further, the excitation light irradiation device, the red light source device and the blue light source in one frame in which the excitation light irradiation device, the red light source device and the blue light source device are sequentially turned on once by the light source control means. When the lighting period of the device is changed, the light source control means is characterized in that the control is performed to change the rotational speed of the fluorescent wheel in response to the change in the lighting period of the excitation light irradiation apparatus.
The projector of the present invention includes a light source unit, a display element, a light guide optical system for guiding light from the light source unit to the display element, and an image emitted from the display element to the screen. And a projector control means for controlling the projection-side optical system to project and the light source unit, the display element, and the like.
According to the present invention, a light source unit includes a fluorescent wheel having a layer of a phosphor that receives excitation light and generates a predetermined wavelength band light, and an excitation light irradiation device for irradiating excitation light to the phosphor of the fluorescent wheel, wherein the light source control means includes: By controlling the emission speed of the excitation light irradiation device and controlling the rotation speed of the fluorescent wheel so that the rotation speed in the period during which the excitation light irradiation device is turned on is an integer, the nonuniformity of the deterioration of the phosphor layer laid in the circumferential direction is prevented. And a light source unit capable of maintaining performance for a long period of time, and a projector provided with the light source unit to prevent flicker on the screen.
In addition, it is provided with two kinds of light source devices having semiconductor light emitting elements such as light emitting diodes, and used for the fluorescent light from the fluorescent wheel irradiated with the excitation light by the excitation light irradiation device and the light source light emitted from each of the two light source devices. When light of each color is configured to be able to be emitted from the light source unit, the luminance can be improved without providing a light emitting diode or the like which emits a predetermined wavelength band light such as green, which is relatively difficult to obtain high luminance in a semiconductor light emitting element. A light source unit and a projector provided with this light source unit can be provided.
In addition, since the duty driving to turn on / off the excitation light source of the excitation light irradiation device or the semiconductor light emitting device of the two kinds of light source devices is possible, the excitation light source and the semiconductor light emitting device which turn on the excitation light source or the semiconductor light emitting device are turned on. It is possible to provide a light source unit capable of increasing output and generating visible light such as bright fluorescent light, and a projector having the light source unit.
The present invention will be more fully understood by the following detailed description and the accompanying drawings, but these are merely for illustrative purposes and do not limit the scope of the present invention.
1 is an external perspective view showing a projector having a light source unit according to an embodiment of the present invention.
2 is a diagram illustrating a functional circuit block of a projector having a light source unit according to an embodiment of the present invention.
3 is a schematic plan view showing an internal structure of a projector having a light source unit according to an embodiment of the present invention.
4 is a plan view schematically showing a front view and a partial cross section of a fluorescent wheel according to an embodiment of the present invention.
5 is a time chart showing the lighting periods of the excitation light irradiation apparatus and the two kinds of light source apparatuses according to the embodiment of the present invention.
6 is a time chart showing a lighting period of the excitation light irradiation apparatus according to the embodiment of the present invention.
7 is a schematic diagram showing an excitation light irradiation region in a rotating fluorescent wheel according to an embodiment of the present invention.
8 is a schematic diagram showing an excitation light irradiation region in a rotating fluorescent wheel according to an embodiment of the present invention.
EMBODIMENT OF THE INVENTION Hereinafter, the preferable form for implementing this invention is demonstrated with reference to drawings. However, in the embodiments described below, various technically preferable limitations are made to practice the present invention, but the scope of the invention is not limited to the following examples and illustrated examples.
EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described. The
The
Therefore, when the blue wavelength band light from the excitation
The red
The light source control means in the projector control means individually controls the light emission of the excitation
The excitation
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is an external perspective view of the
And as shown in FIG. 1, the
In addition, the
In addition, on the rear of the housing,
Next, the projector control means of the
In addition, the
The
In addition, the image
The
The operation signal of the key /
The
Moreover, the
In addition, the
Next, the internal structure of this
The
The excitation
The
A cooling
The fluorescent
The
The emitted light from the excitation
In the excitation light reflected from the reflecting surface of the
The red
The blue
The light source side
The blue wavelength band light is transmitted at positions where the optical axis of the blue wavelength band light emitted from the blue
The
The
The
The
Next, the control of the excitation
Specifically, as shown in FIG. 5, the light source control means includes a red
Thus, when only the red
In addition, since the light source control means can individually control the light emission of the excitation
That is, this
However, in the case where the
Accordingly, the light source control means according to the present embodiment individually controls the light emission of the excitation
That is, when the light source control means emits light of each color evenly, as shown in Fig. 6A, the excitation
Then, the light source control means, when performing various projection modes for adjusting the color tone, the brightness, etc., for example, in the projection mode in the case of wanting to enhance the green in the projected image, As shown in FIG. 6B, the excitation
That is, the light source control means executes control for changing the rotational speed of the
As described above, according to the present invention, the red
In addition, the
And according to this invention, the rotation speed in the period which controls the light emission of the excitation
In addition, since the rotational speed of the
In addition, the rotation speed in the period which turns on the excitation
In addition, the
In addition, this invention is not limited to the above Example, A change and improvement are freely possible in the range which does not deviate from the summary of invention. For example, the light source control means may be provided separately in the
Further, in the above embodiment, the dichroic mirror is used to change the optical axis direction or to select the transmission and reflection according to the wavelength, but the present invention is not limited thereto. For example, other alternatives such as a dichroic prism may be used. It may be possible to replace the dichroic mirror described above with means.
In addition, in the said embodiment, although the
In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the embodiment. In addition, the functions performed in the above-described embodiments may be performed in combination as appropriate. The above-described embodiments include various steps, and various inventions can be extracted by appropriate combinations of the plurality of configuration requirements disclosed. For example, even if some of the configuration requirements are deleted from the overall configuration requirements shown in the embodiment, if an effect is obtained, a configuration from which the configuration requirements are deleted can be extracted as the invention.
Claims (7)
A fluorescent wheel in which a layer of a phosphor that receives excitation light from the excitation light irradiation device and emits fluorescent light of a predetermined wavelength band is laid in the circumferential direction; And
Light source control means for controlling the light emission of the excitation light irradiation device and for controlling the rotational speed of the fluorescent wheel
Including,
The light source unit controls the light source unit to control the rotation speed of the fluorescent wheel so that the fluorescent wheel becomes a constant speed in a period of turning on the excitation light irradiation apparatus.
Two kinds of light source devices for emitting wavelength band light different from the fluorescent light emitted from the fluorescent wheel; And
A light source side optical system for condensing the fluorescent light emitted from the fluorescent wheel and the light emitted from each of the two kinds of light source devices on a predetermined surface
Including,
And the light source control means controls light emission of the excitation light irradiation device and the two kinds of light source devices individually.
The light source control means controls the rotational speed of the fluorescent wheel so that the fluorescent wheel becomes an integer rotational speed in the changed lighting period when the lighting period of the excitation light irradiation apparatus is changed.
And the light source control means controls the rotational speed of the fluorescent wheel so that the rotation speed of the fluorescent wheel is 1 in the lighting period of the excitation light irradiation apparatus.
The excitation light irradiation apparatus includes an excitation light source that emits excitation light of a blue wavelength band,
The two kinds of light source devices include a red light source device having a semiconductor light emitting element emitting red wavelength band light, and a blue light source device having a semiconductor light emitting element emitting blue wavelength band light.
The fluorescent light emitting region of the fluorescent wheel receives the excitation light from the excitation light irradiation device and emits green wavelength band light.
The excitation light irradiation device, the red light source device and the blue light source device in one frame in which the excitation light irradiation device, the red light source device and the blue light source device are sequentially turned on once by the light source control means. The light source unit, when the lighting period is changed, performs the control to change the rotational speed of the fluorescent wheel in response to a change in the lighting period of the excitation light irradiation apparatus.
Display elements;
A light guide optical system for guiding light from the light source unit to the display element;
A projection-side optical system for projecting an image emitted from the display element onto a screen; And
Projector control means for controlling the light source unit and the display element
Projector comprising a.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020100104907A KR20110046341A (en) | 2009-10-28 | 2010-10-26 | Light source unit and projector |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPJP-P-2009-247708 | 2009-10-28 | ||
KR1020100104907A KR20110046341A (en) | 2009-10-28 | 2010-10-26 | Light source unit and projector |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020120110646A Division KR101623004B1 (en) | 2009-10-28 | 2012-10-05 | Light source unit and projector |
Publications (1)
Publication Number | Publication Date |
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KR20110046341A true KR20110046341A (en) | 2011-05-04 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020100104907A KR20110046341A (en) | 2009-10-28 | 2010-10-26 | Light source unit and projector |
Country Status (1)
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KR (1) | KR20110046341A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110018606A (en) * | 2018-01-09 | 2019-07-16 | 卡西欧计算机株式会社 | Light supply apparatus and projection arrangement |
-
2010
- 2010-10-26 KR KR1020100104907A patent/KR20110046341A/en active Application Filing
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110018606A (en) * | 2018-01-09 | 2019-07-16 | 卡西欧计算机株式会社 | Light supply apparatus and projection arrangement |
CN110018606B (en) * | 2018-01-09 | 2021-05-14 | 卡西欧计算机株式会社 | Light source device and projection device |
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