CN107172405B - Color wheel device and its light source equipment and optical projection system - Google Patents
Color wheel device and its light source equipment and optical projection system Download PDFInfo
- Publication number
- CN107172405B CN107172405B CN201710270750.4A CN201710270750A CN107172405B CN 107172405 B CN107172405 B CN 107172405B CN 201710270750 A CN201710270750 A CN 201710270750A CN 107172405 B CN107172405 B CN 107172405B
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- colour wheel
- wheel device
- color
- color wheel
- airflow channel
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Classifications
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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
-
- 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
- H04N9/3144—Cooling systems
-
- 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
- H04N9/3161—Modulator illumination systems using laser light sources
Abstract
The present invention relates to a kind of color wheel device and its light source equipment and optical projection systems.The color wheel device packet Chinese juniper shell, inside is formed with airflow channel；Color block component is arranged in the airflow channel, includes at least the colour wheel disk with wavelength convert function；Air stream drives component is arranged in the airflow channel, and direction of the air-flow generated from the air stream drives component transverse to the colour wheel panel surface reaches the colour wheel panel surface.Color wheel device and its light source equipment according to the present invention and optical projection system, can be improved the air flow property of colour wheel panel surface, to quickly reduce the temperature of colour wheel disk.
Description
The application be applicant submitted on November 21st, 2013 application No. is 201310595000.6, denomination of invention
For the divisional application of " color wheel device and its light source equipment and optical projection system ".
Technical field
The present invention relates to a kind of apparatus for optical projection, especially a kind of color wheel device.The invention further relates to use this color
The light source equipment of wheel apparatus, and the optical projection system using this optical device.
Background technique
Optical projection system according to its principle can be divided into liquid crystal projecting (that is, LCD), monocrystalline silicon liquid crystal projecting (that is,
) and digital optical processing technique projection device (that is, DLP) etc. LCOS.Wherein, DLP projection device has brightness high, and color rendition is quasi-
Really, the response time is short, no noise and it is frivolous the advantages that, become one of the optical projection system of current mainstream.
In DLP projection device, it is and to utilize principle of reflection using digital control, passes through lens after light source is concentrated
It focuses, is projected on digital microwafer after being then passed through the colour wheel with colorized optical filtering.It is many micro- due to having on digital microwafer
Small movable lens, driving electrodes control the tilt angle and deflection period of movable lens, then the reflection direction by switching light
It is projected on screen and is imaged through lens group.
Colour wheel is the important component in DLP projection device, mainly include motor, the colour wheel disk that is fixedly connected with motor with
And surround the shell of colour wheel.The fluorescent powder of red, green, blue, Bai Si kind color, laser facula direct irradiation are coated on colour wheel disk
To colour wheel phosphor area and be filtered into Red Green Blue to be projected.Under the irradiation of laser, colour wheel disk meeting
It absorbs quite high heat and increases its temperature quickly, high temperature may result in colour wheel and break down, and in turn result in production
The decline of product quality.
Summary of the invention
For the problems of in the prior art, the invention proposes a kind of color wheel devices.This color wheel device can
The air flow property of colour wheel panel surface is improved, to quickly reduce the temperature of colour wheel disk.
According to the first aspect of the invention, a kind of color wheel device is proposed, including,
Shell, inside are formed with airflow channel；Color block component is arranged in airflow channel, and including at least has wavelength
The colour wheel disk of conversion function；Air stream drives component is arranged in airflow channel, and the air-flow generated is from air stream drives component along horizontal
Colour wheel panel surface is reached in the direction of colour wheel panel surface.
Color wheel device according to the present invention, wind vertically blow to colour wheel panel surface, greatly improve colour wheel panel surface
Air flow property increases cross-ventilation coefficient here, also which thereby enhances the Air Heat Transfer Coefficient of colour wheel panel surface.Separately
Outside, air stream drives component makes the air circulation flow inside color wheel device get up and without dead angle, and this also increases shells
The heat-exchange capacity of interior hot and cold air.
It should be noted that, in this document, term " laterally " be interpreted as being formed relative to the surface of colour wheel disk it is certain
Angle, the i.e. flow direction of wind have a certain degree relative to the normal to a surface shape of colour wheel disk.The angle is, for example, 0 to 45
Degree, preferably 0 degree (i.e. surface of the flowing side of wind perpendicular to colour wheel disk).
In one embodiment, airflow channel is the circulation canal of head and the tail connection or is half-duplex channel.Airflow channel exists
Perforative channel is formed in shell, under the driving of air stream drives component, the air in airflow channel is recycled along airflow channel
Flowing, improves the heat-exchange capacity of the intracorporal hot and cold air of shell, avoids the circulation dead zone of air in shell.
In a preferred embodiment, the airflow channel part between air stream drives component and color block component is with air-flow
Extending direction is vertical with the surface of colour wheel disk.In this way, no matter air stream drives component how to be arranged or the other parts of airflow channel
How to be arranged, wind always can vertically blow to the surface of colour wheel disk under the guidance of airflow channel, this facilitate that the design of shell
With the design of colour wheel.As described above, term " vertical " can not understand according to mathematical meaning here, and it is interpreted as close to 90
Degree.
In one embodiment, the cross sectional inner diameter of airflow channel is from air stream drives component place to color block component place
Place's gradient is successively decreased.This airflow channel helps to improve the wind speed for reaching the surface of colour wheel disk, improves cross-ventilation system here
Count and improve the Air Heat Transfer Coefficient of colour wheel panel surface.
In one embodiment, air stream drives component is relative to colour wheel disk eccentric setting, and generated air-flow reaches color
The region that the region of sheave surface is irradiated with colour wheel panel surface stimulated luminescence is not be overlapped.This structure makes in synchronization, gas
The part that the part of stream and color sheave contact is illuminated by the light with colour wheel disk is not be overlapped, and the dust influence avoided in wind projects colour wheel
Light on disk, to help to improve image quality.
In one embodiment, inner walls are equipped with one or more intervals along airflow direction extension being parallel to each other
Airflow channel is divided into multiple subchannels being separated from each other by plate.The cross sectional dimensions of these subchannels is smaller and surface area compared with
Greatly, facilitate by housing wall quickly to shed the heat in air.In a preferred embodiment, air stream drives component packet
Include one or more fans, and air-flow co-flow caused by fan.Fan can overcome the air flowing generated by subchannel
Resistance, to greatly improve the flowing velocity of the intracorporal air of shell, this also contributes to cooling down to colour wheel.
In one embodiment, external radiator is formed with or is equipped in housing outer surface.External radiator can
Heat from airflow channel and shell other parts is quickly dispersed.In addition, shell and individual external radiator can be single
Only production reduces manufacture difficulty, facilitates production.In a preferred embodiment, external radiator towards in shell
Semiconductor cooler is provided on one side surface in portion.Semiconductor cooler can further decrease the temperature of shell, facilitate shell
The heat in internal portion quickly sheds, and finally further decreases the temperature of colour wheel.In another embodiment, it is equipped in airflow channel
Built-in radiator passes through semiconductor cooler face contact between external radiator and built-in radiator.Built-in radiator facilitates
The heat of enclosure interior is quickly shed, to further decrease the temperature of colour wheel.
In one embodiment, color block component further includes being connect with colour wheel disk to drive colour wheel coiling central shaft to rotate
Motor.
According to the second aspect of the invention, a kind of light source equipment, including excitation light source are proposed, and as described above
Color wheel device is equipped with light inlet and light-emitting window on the shell of color wheel device, and the light that excitation light source issues enters from light inlet, shines
It is mapped on the colour wheel disk of color wheel device, and is projected from light-emitting window.
According to the third aspect of the invention we, a kind of optical projection system is proposed, including light source equipment as described above, is also wrapped
Include the imaging device that the light projected from the light-emitting window of light source equipment is carried out to projection imaging.
Make the intracorporal sky of shell compared with the prior art, the advantages of the present invention are as follows, air stream drives component and airflow channel
Gas circulates, and avoids enclosure interior and air circulation dead zone occurs, to improve the rate of heat exchange of hot and cold air.In addition, gas
The airflow channel part flowed between driving assembly and color block component is vertical with the surface of the colour wheel disk with the extending direction of air-flow,
No matter how air stream drives component is arranged or how the other parts of airflow channel are arranged, always wind can be in first path part
The surface that colour wheel disk is vertically blowed under guidance, facilitates the design of shell and the design of colour wheel, and wind vertically blows to color
Sheave surface greatly improves the air flow property of colour wheel panel surface, increases cross-ventilation coefficient here, also thus mentions
The high Air Heat Transfer Coefficient of colour wheel panel surface.External radiator, built-in radiator, semiconductor cooler use can be further
The temperature of shell is reduced, the heat for facilitating enclosure interior quickly sheds, and finally further decreases the temperature of colour wheel.
Detailed description of the invention
Hereinafter by based on only non-limiting embodiment and with reference to attached drawing come to the present invention retouched in more detail
It states.Wherein:
Fig. 1 is the first embodiment of color wheel device according to the present invention；
Fig. 2 is the second embodiment of color wheel device according to the present invention；
Fig. 3 is the 3rd embodiment of color wheel device according to the present invention.
Identical component is indicated by identical appended drawing reference in the figure.The attached drawing is not drawn according to the actual ratio.
Specific embodiment
Below in conjunction with attached drawing, the present invention will be further described.
Fig. 1 schematically shows the first embodiment of color wheel device 10 according to the present invention.As shown in Figure 1, colour wheel fills
Setting 10 includes shell 11, is formed with airflow channel in shell 11, the color block component in airflow channel is arranged in and for color
The air stream drives component of wheel assembly cooling.Same as the prior art, color block component includes motor 13 and is fixedly connected with motor 13
Colour wheel disk 14, be provided with fluorescent powder on colour wheel disk 14, to be emitted onto exciting light thereon be converted into other wavelength by
Laser emitting.The rotation of motor 13 can drive colour wheel disk 14 to rotate around central shaft.Color wheel device 10 further includes the technology of this field
Other accessories known to personnel, for simplicity, which is not described herein again.
Air stream drives component includes the first fan 21 being arranged in airflow channel.As shown in Figure 1, airflow channel includes the
One path sections 22, the second path sections 23, connect first path part 22 end and the second path sections 23 starting point
First Transition part 24 and connection 23 end of the second path sections and 22 starting point of first path part the second transition portion
25.First path part 22 and the second path sections 23 can general parallel orientation, and First Transition part 24 and the second transition portion 25
It may be selected to be generally perpendicular to first path part 22 or the second path sections 23.Four path sections head and the tail connections form perforation
Airflow channel, in this way when the first fan 21 driving wind in airflow channel internal circulation flow, wind can brush colour wheel disk 14 and mention
The gaseous exchange speed on its high surface, the gas with heat flow in airflow channel and are given off heat by shell 11
It goes, therefore preferably shell 11 is made of the metal or ceramics of good heat conductivity.The airflow channel of perforation also avoids in shell 11
There is air circulation dead zone in portion, improves air heat-exchange efficiency.First fan 21 may be selected to be aerofoil fan or centrifugal fan.
In the embodiment shown in fig. 1, the first fan 21 and color block component are arranged in first path part 22, and should
The cross sectional inner diameter of first path part 22 is successively decreased from the first fan 21 to the direction gradient of color block component.Specifically, first
Path sections 22 include the big end 50 being relatively large in diameter, the lesser small end 52 of diameter and the big end 50 of connection and small end 52
Tapered portion 51, as a whole, first path part 22 be horn shape.Fan 21 is mounted in big end 50, small end
52 for assembling and sending out wind.In a preferred embodiment, 22 the prolonging with air-flow of small end 52 of first path part
The surface that direction enables air-flow vertically to blow to colour wheel disk 14 from the first fan 21 perpendicular to the surface of colour wheel disk 14 is stretched, this
The speed air flow on 14 surface of colour wheel disk can be greatlyd improve, to improve Air Heat Transfer Coefficient here.
Preferably, the first fan 21 is not weighed relative to 14 eccentric setting of colour wheel disk, and with the light inlet 40 on shell 11
It is folded, in this way in synchronization, region and the colour wheel disk 14 of the air-flow perpendicular contact of colour wheel disk 14 generated with the first fan 21
The region of stimulated luminescence irradiation is not overlapped, this helps to improve image quality.As described in Figure 1, gas caused by the first fan 21
The position that the stream position being in contact with colour wheel disk 14 and the light and color wheel disc 14 projected are in contact is relative in colour wheel disk 14
Mandrel line and diametrically, it means that the wind position being in contact with colour wheel disk 14 caused by the first fan 21 and projected
The position that light and color wheel disc 14 is in contact is in the both ends of the same diameter of colour wheel disk 14.
In order to improve heat dissipation performance, the inner wall of the second path sections 23 is equipped with one or more intervals being parallel to each other
Plate, airflow direction of these spacing boards in the second path sections 23 extend, and are divided into multiple subchannels being separated from each other.
These subchannels increase heat dissipation area, facilitate heat and shed quickly through the wall of shell 11.But multiple subchannels are set
Air flow resistance can be caused to increase and cause air flowing slowly, in this case, air stream drives component further includes setting
The second fan 26 in First Transition part 24, to overcome this resistance, certain driving air-flow enters the second path sections 23.The
Two fans 26 are alternatively chosn to aerofoil fan or centrifugal fan.In a preferred embodiment, second is in shell 11
The outside of path sections 23 is integrally formed with external radiator 27, for example, radiating fin.
Fig. 2 schematically shows the second embodiment of color wheel device 10 according to the present invention.This embodiment and Fig. 1
Embodiment be substantially the same, difference is only that: external radiator 27 is configured to standalone module, in external radiator 27 and shell
Semiconductor cooler 28 is provided between 11.Due to peltier effect (Peltier effect), the semiconductor in power on condition
The temperature in the face of refrigerator 28 being in contact with shell 11 can reduce, even lower than the surface temperature of shell 11, therefore can be into one
Step improves heat dissipation performance, to reduce the temperature of colour wheel.It is big in the embodiment of other details and Fig. 1 in the embodiment
Body is identical, and detailed description is omitted herein.
Fig. 3 schematically shows the 3rd embodiment of color wheel device 10 according to the present invention.This embodiment and Fig. 1
Embodiment be substantially the same, difference is only that: having installation in the regional structure corresponding to the second path sections 23 of shell 11
Hole 30, the settable heat-sink unit in mounting hole 30.Heat-sink unit includes the built-in radiator 31 being in airflow channel, main body
External radiator 27 and setting outside shell between built-in radiator 31 and external radiator 27 and distinguish face contact
Semiconductor cooler 28.As shown in figure 3, built-in radiator 31 is arranged in the region of the second path sections 23 and guarantees second
Path sections 23 are unimpeded.
The flow path of air-flow is described below according to Fig. 1 to 3.
As shown in the arrow in Fig. 1 to 3, under the action of the first fan 21, air-flow is vertical by first path part 22
Ground reaches the surface of colour wheel disk 14, takes away its heat and is cooled down.Then, air-flow can cross the motor that colour wheel disk 14 reaches rear portion
13 to motor 13 to cool down.It should be noted that color block component is arranged so that most air stream from the top of colour wheel disk 14
It crosses, only minimal amount of air stream can flow through simultaneously from the front (that is, between light inlet 40 and colour wheel disk 14) of colour wheel disk 14
It is crossed from below, this helps to improve image quality.Under the action of the second fan 26, wind can enter the second path sections
23, into external environment gas flow temperature is reduced the heat transfer in air in this section.After the first fan 21
Portion will form negative pressuren zone, and air-flow after temperature reduces will receive the first fan 21 after moving out from the second path sections 23
Swabbing action and be again introduced into first path part 22, carry out the heat dissipation of next round.
The invention further relates to the light source equipments for using color wheel device 10 described above.Known to those skilled in the art
Ground is that light source equipment includes excitation light source (not shown).Light inlet 40 and light-emitting window are equipped on the shell 11 of color wheel device 10
42, the light that excitation light source issues enters from light inlet 40, is irradiated on the colour wheel disk 14 of color wheel device 10, and penetrate from light-emitting window 42
Out.
The invention further relates to the optical projection systems for using light source equipment described above.The known ground of those skilled in the art
Being further includes the imaging device that the light projected from the light-emitting window of light source equipment is carried out to projection imaging.
Although by reference to preferred embodiment, invention has been described, the case where not departing from the scope of the present invention
Under, various improvement can be carried out to it and can replace component therein with equivalent.Especially, as long as there is no structures to rush
Prominent, items technical characteristic mentioned in the various embodiments can be combined in any way.The invention is not limited to texts
Disclosed in specific embodiment, but include all technical solutions falling within the scope of the claims.
Claims (13)
1. a kind of color wheel device, comprising:
Shell, inside are formed with airflow channel；
Color block component is arranged in the airflow channel, includes at least the colour wheel disk with wavelength convert function；
Air stream drives component, be arranged in the airflow channel, generate air-flow from the air stream drives component transverse to
The direction of the colour wheel panel surface is to reach the colors along the directions the angle between the normal of colour wheel panel surface for 0 to 45 degree
Sheave surface；
Airflow channel part between the air stream drives component and color block component with air-flow extending direction and the colour wheel disk
Surface it is vertical；To the color block component place at where the cross sectional inner diameter of the airflow channel from the air stream drives component
Place's gradient is successively decreased.
2. color wheel device according to claim 1, which is characterized in that the airflow channel is the circulation canal of head and the tail connection
It or is half-duplex channel.
3. color wheel device according to claim 1, which is characterized in that the air stream drives component is relative to the colour wheel disk
Eccentric setting, and generated air-flow reaches region and the colour wheel panel surface stimulated luminescence irradiation of the colour wheel panel surface
Region is not overlapped.
4. according to claim 1 to color wheel device described in any one of 3, which is characterized in that the inner walls are equipped with one
Or multiple spacing boards extended along airflow direction being parallel to each other, the airflow channel is divided into multiple sons being separated from each other and is led to
Road.
5. color wheel device according to claim 1, which is characterized in that the air stream drives component includes one or more wind
Fan, and air-flow co-flow caused by the fan.
6. according to claim 1 to color wheel device described in any one of 3, which is characterized in that the shape in the housing outer surface
At there is or be equipped with external radiator.
7. color wheel device according to claim 4, which is characterized in that be formed with or be equipped in the housing outer surface
External radiator.
8. color wheel device according to claim 5, which is characterized in that be formed with or be equipped in the housing outer surface
External radiator.
9. color wheel device according to claim 6, which is characterized in that the external radiator towards the enclosure interior
A side surface on be provided with semiconductor cooler.
10. color wheel device according to claim 6, which is characterized in that be equipped with built-in radiator, institute in the airflow channel
It states between external radiator and built-in radiator through semiconductor cooler face contact.
11. color wheel device according to claim 1, which is characterized in that the color block component further includes and the colour wheel disk
Motor of the connection to drive the colour wheel coiling central shaft to rotate.
12. a kind of light source equipment, including excitation light source, which is characterized in that further include as described in any one of claims 1 to 11
Color wheel device, be equipped with light inlet and light-emitting window on the shell of the color wheel device, the light that the excitation light source issues is from institute
Light inlet entrance is stated, is irradiated on the colour wheel disk of the color wheel device, and is projected from the light-emitting window.
13. a kind of optical projection system, which is characterized in that including the light source equipment described in claim 12, further including will be from the light
The light that the light-emitting window of source device projects carries out the imaging device of projection imaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710270750.4A CN107172405B (en) | 2013-11-21 | 2013-11-21 | Color wheel device and its light source equipment and optical projection system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710270750.4A CN107172405B (en) | 2013-11-21 | 2013-11-21 | Color wheel device and its light source equipment and optical projection system |
| CN201310595000.6A CN104661005B (en) | 2013-11-21 | 2013-11-21 | Color wheel device, and light source device as well as projection system thereof |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310595000.6A Division CN104661005B (en) | 2013-11-21 | 2013-11-21 | Color wheel device, and light source device as well as projection system thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107172405A CN107172405A (en) | 2017-09-15 |
| CN107172405B true CN107172405B (en) | 2019-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310595000.6A Active CN104661005B (en) | 2013-11-21 | 2013-11-21 | Color wheel device, and light source device as well as projection system thereof |
| CN201710270750.4A Active CN107172405B (en) | 2013-11-21 | 2013-11-21 | Color wheel device and its light source equipment and optical projection system |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310595000.6A Active CN104661005B (en) | 2013-11-21 | 2013-11-21 | Color wheel device, and light source device as well as projection system thereof |
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| CN (2) | CN104661005B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106569377B (en) * | 2015-10-12 | 2023-08-04 | 深圳光峰科技股份有限公司 | Color wheel heat radiation structure and projection device |
| WO2017092669A1 (en) * | 2015-12-02 | 2017-06-08 | 深圳市光峰光电技术有限公司 | Colour wheel device |
| CN106814526B (en) * | 2015-12-02 | 2020-10-20 | 深圳光峰科技股份有限公司 | Color wheel device |
| CN107664903B (en) | 2016-07-27 | 2020-04-28 | 深圳光峰科技股份有限公司 | Color wheel device and projector |
| CN111999970A (en) | 2019-05-27 | 2020-11-27 | 中强光电股份有限公司 | Wavelength conversion module, light source device and projection equipment |
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| CN1580943A (en) * | 2003-08-08 | 2005-02-16 | 中强光电股份有限公司 | Inlet structure |
| CN101093344A (en) * | 2006-06-19 | 2007-12-26 | 三星电子株式会社 | Image projecting apparatus |
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| CN101256342A (en) * | 2007-02-28 | 2008-09-03 | 明基电通股份有限公司 | Projector |
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| TWI289426B (en) * | 2006-04-21 | 2007-11-01 | Coretronic Corp | Projector and heat dissipating device thereof |
| US8678597B2 (en) * | 2009-03-30 | 2014-03-25 | Nec Display Solutions, Ltd. | Projection type display device |
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| TW201228569A (en) * | 2010-12-17 | 2012-07-01 | Delta Electronics Inc | Container and electronic apparatus assembly comprising the same |
| JP2013195668A (en) * | 2012-03-19 | 2013-09-30 | Ricoh Co Ltd | Image projection device |
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|---|---|---|---|---|
| CN1580943A (en) * | 2003-08-08 | 2005-02-16 | 中强光电股份有限公司 | Inlet structure |
| CN101093344A (en) * | 2006-06-19 | 2007-12-26 | 三星电子株式会社 | Image projecting apparatus |
| CN101114115A (en) * | 2006-07-26 | 2008-01-30 | 中强光电股份有限公司 | Projecting camera and heat radiating device used for projecting camera |
| CN101256342A (en) * | 2007-02-28 | 2008-09-03 | 明基电通股份有限公司 | Projector |
| CN101498887A (en) * | 2008-02-01 | 2009-08-05 | 鸿富锦精密工业（深圳）有限公司 | Digital optical processing projection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104661005B (en) | 2017-05-17 |
| CN107172405A (en) | 2017-09-15 |
| CN104661005A (en) | 2015-05-27 |
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