CN1716085A - Method of reducing the temperature difference between upper and lower portions of a lamp bulb, optical unit and projection apparatus - Google Patents
Method of reducing the temperature difference between upper and lower portions of a lamp bulb, optical unit and projection apparatus Download PDFInfo
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- CN1716085A CN1716085A CN 200510087851 CN200510087851A CN1716085A CN 1716085 A CN1716085 A CN 1716085A CN 200510087851 CN200510087851 CN 200510087851 CN 200510087851 A CN200510087851 A CN 200510087851A CN 1716085 A CN1716085 A CN 1716085A
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Abstract
A method and apparatus is disclosed which minimizes the temperature difference between upper and lower portions of a lamp bulb in an optical unit. A UV-IR cut filter is disposed in a downwardly inclined relationship such that an upper portion thereof is nearer to a discharge lamp than a lower portion thereof so that infrared rays and ultraviolet rays included in light emitted from a lamp bulb and reflected in a forward direction from an upper portion of a reflecting face are reflected toward a lower portion of the reflecting face. As the reflected light from the UV-IR cut filter is illuminated on the lower portion of the reflecting face, the temperature difference between upper and lower portions of the lamp bulb is reduced.
Description
Technical field
The present invention relates to a kind of temperature difference that reduces between bulb top and the bottom and prolong the method for life that is used in the discharge lamp in the optical devices such as projector, optical unit, projection display equipment and device for projection television for example.
Background technology
This liquid crystal projection apparatus as shown in figure 11 is known and open in the open No.2001-183746 of Jap.P..With reference to Figure 11, liquid crystal projection apparatus 1001 comprises the optical unit 103 that is installed in housing 102 inside.Optical unit 103 comprises the discharge lamp 104 as light source, be arranged on the UV-IR cutoff filter 105 on discharge lamp 104 optical axises, PS conversion equipment 106 and catoptron 107, and be arranged on via dichronic mirror 108R and 108G and catoptron 109 on the optical axis of the light of catoptron 107 reflection.Optical unit 103 also comprises the catoptron 1111 and 112 that is arranged on respectively by on the optical axis of the light of dichronic mirror 108R and catoptron 109 reflections, and is arranged on respectively by collector lens 113R, 113G and 113B on the optical axis of the light of catoptron 1111,108G and 112 reflections.Optical unit 103 also comprises space optics modulator element 114R, 114G and the 114B as the Red Green Blue of three forms such as transmissive liquid crystal panel of light modulation portion, be arranged on and be used for photosynthetic cross prisms (cross prism) 115 on the beam path that sends from space optics modulator element 114R, 114G and 114B, and be used for the projecting lens 116 of projection through the synthetic full-colour image of cross prisms 115 optics.Ultrahigh pressure mercury lamp is as discharge lamp 104, and reduces around the bulb of discharge lamp 104 with fan and the lamp reflector temperature inside of discharge lamp 104.
In above-mentioned liquid crystal projection apparatus 1001, air is supplied with by being arranged on the gap that is called air gap in the lamp reflector that acts on the discharge lamp in the projector etc., and regulates the approach angle (introduction angle of a fan duct) in fan letter road and the voltage on the fan motor and reduce the temperature difference between bulb top and the bottom.But,,, therefore, be difficult to realize bulb upper and lower temperature is cooled off control accurately owing to be in certain distance, to cool off bulb by the air gap air supply for this mechanical hook-up.Thereby this mechanical hook-up can not reduce the temperature difference between bulb top and the bottom fully.
This just produces so problem, and promptly the bulb of discharge lamp bleaches or blackening, and this can cause the minimizing of bulb life.
Just now this problem of Miao Shuing did not occur over just the occasion of using the UV-IR cutoff filter, occurred in the occasion of using the IR cutoff filter too.
Summary of the invention
The purpose of this invention is to provide a kind of optical unit, projection display equipment and device for projection television that reduces the method for the temperature difference between bulb top and the bottom and use this method.
In order to achieve the above object, according to the present invention, be provided for separately discharge lamp, irradiation is from the reflection line position of the catoptrical lamp reflector of IR cutoff filter or UV-IR cutoff filter.
Especially, according to one embodiment of present invention, provide the method for the temperature difference between top that a kind of minimizing is arranged on the bulb of the discharge lamp on the horizontal direction in the device and the bottom, the IR cutoff filter that described device is arranged on the discharge lamp front except discharge lamp also comprises.Except bulb, discharge lamp also comprises having the lamp reflector that is arranged on the reflecting surface around the bulb, and this reflecting surface is used to reflect the light that sends from bulb and upwards launches this reflected light forwards.This method comprise by the IR cutoff filter on downward direction slightly towards the reflecting surface reflection be included in send from bulb, by the reflecting surface reflection and from the ultrared step of reflecting surface the light that downward direction is launched.
According to another embodiment of the invention, provide the method for the temperature difference between the top of the bulb that a kind of minimizing is arranged on the discharge lamp on the direction downward in the device and the bottom, the IR cutoff filter that described device is arranged on the discharge lamp downside except discharge lamp also comprises.Except bulb, discharge lamp also comprises having the lamp reflector that is arranged on the reflecting surface around the bulb, and this reflecting surface is used to reflect the light that sends from bulb and at downward this reflected light of direction emission.This method comprise by the IR cutoff filter be included in to reflection on a direction of reflecting surface periphery send from bulb, by reflecting surface reflection and from reflecting surface in the ultrared step the light of emission upwards forwards.
According to another embodiment of the invention, provide the method for the temperature difference between the top of the bulb that a kind of minimizing is arranged on the discharge lamp on the direction that makes progress in the device and the bottom, the IR cutoff filter that described device is arranged on the discharge lamp upside except discharge lamp also comprises.Except bulb, discharge lamp also comprises having the lamp reflector that is arranged on the reflecting surface around the bulb, and this reflecting surface is used to reflect the light that sends from bulb and the direction that makes progress is launched this reflected light.This method comprise by the IR cutoff filter to be included in towards the reflection of the direction of reflecting surface periphery send from bulb, by the reflecting surface reflection and from reflecting surface in the ultrared step the light of emission upwards upward.
According to another embodiment of the invention, provide the method for the temperature difference between top that a kind of minimizing is arranged on the bulb of the discharge lamp on the horizontal direction in the device and the bottom, the UV-IR cutoff filter that described device is arranged on the discharge lamp front except discharge lamp also comprises.Except bulb, discharge lamp also comprises having the lamp reflector that is arranged on the reflecting surface around the bulb, and this reflecting surface is used to reflect the light that sends from bulb and upwards launches this reflected light forwards.This method comprise by the UV-IR cutoff filter on downward direction slightly towards the reflecting surface reflection be included in send from bulb, by reflecting surface reflection and the ultrared step from the light that reflecting surface is forwards launched.
According to another embodiment of the invention, the method of the temperature difference between the top of the bulb that a kind of minimizing is arranged on the discharge lamp on the direction downward in the device and the bottom is provided, and described device is arranged on a UV-IR cutoff filter of discharge lamp downside except discharge lamp also comprises.Except bulb, discharge lamp also comprises having the lamp reflector that is arranged on the reflecting surface around the bulb, and this reflecting surface is used to reflect the light that sends from bulb and launches this reflected light in downward direction.This method comprise by the UV-IR cutoff filter be included in to reflection on a direction of reflecting surface periphery send from bulb, by reflecting surface reflection and from the ultrared step of reflecting surface the light that downward direction is launched.
According to another embodiment of the invention, the method of the temperature difference between the top of the bulb that a kind of minimizing is arranged on the discharge lamp on the direction that makes progress in the device and the bottom is provided, and described device is arranged on a UV-IR cutoff filter of discharge lamp upside except discharge lamp also comprises.Except bulb, discharge lamp also comprises having the lamp reflector that is arranged on the reflecting surface around the bulb, and this reflecting surface is used to reflect the light that sends from bulb and this reflected light of direction emission that is making progress.This method comprise by the UV-IR cutoff filter reflection on the direction of reflecting surface periphery be included in send from bulb, by reflecting surface reflection and from the ultrared step of reflecting surface the light that direction is upward launched.
According to a further embodiment of the invention, provide a kind of optical unit, this optical unit comprises: discharge lamp in the horizontal direction is set, and it is used for projected image, and the IR cutoff filter that is arranged on discharge lamp the place ahead.Discharge lamp comprises: a bulb and having is arranged on the lamp reflector of the reflecting surface around the bulb, and this lamp reflector is used to reflect the light that sends from bulb and upwards launches this reflected light forwards.By the IR cutoff filter on downward direction slightly towards the reflecting surface reflection be included in send from bulb, by reflecting surface reflection and the infrared ray from the light that reflecting surface is forwards launched.
According to a further embodiment of the invention, provide a kind of optical unit, this optical unit comprises: be arranged on the discharge lamp of horizontal direction, it is used for projected image, and the UV-IR cutoff filter that is arranged on discharge lamp the place ahead.Discharge lamp comprises: bulb and having is arranged on the lamp reflector of the reflecting surface around the bulb, and this lamp reflector is used to reflect the light that sends from bulb and upwards launches this reflected light forwards.By the UV-IR cutoff filter be included in towards the reflecting surface reflection on the downward direction slightly send from bulb and by reflecting surface and from reflecting surface at ultraviolet ray and the infrared ray the light of reflection upwards forwards.
According to still a further embodiment, provide a kind of projection display equipment that comprises optical unit, this optical unit is used for projected image to display screen.This optical unit comprises the discharge lamp that is arranged on horizontal direction and is arranged on the IR cutoff filter of discharge lamp front.Discharge lamp comprises: bulb and having is arranged on the lamp reflector of the reflecting surface around the bulb, and this lamp reflector is used to reflect the light that sends from bulb and upwards launches this reflected light forwards.By the IR cutoff filter on downward direction slightly towards the reflecting surface reflection be included in send from bulb, by reflecting surface reflection and the infrared ray from the light that reflecting surface is forwards launched.
According to another embodiment of the invention, provide a kind of projection display equipment that comprises optical unit, this optical unit is used for projected image to display screen.This optical unit comprises the discharge lamp that is arranged on horizontal direction and is arranged on the UV-IR cutoff filter of discharge lamp front.Discharge lamp comprises that bulb and having is arranged on the lamp reflector of the reflecting surface around the bulb, and this lamp reflector is used to reflect the light that sends from bulb and upwards launches this reflected light forwards.By the UV-IR cutoff filter on downward direction slightly towards the reflecting surface reflection be included in send from bulb, by reflecting surface reflection and infrared ray and ultraviolet ray from the light that reflecting surface is forwards launched.
According to another embodiment of the invention, a kind of device for projection television is provided, this device comprises: framework, be connected in the rear projection type screen of framework front, be arranged on the optical unit on the framework, be used for projecting TV picture, and be connected in the catoptron that is used for the television image projected luminous flux of sending from optical unit is reflexed to the back side of rear projection type screen on the framework.This optical unit comprises the discharge lamp that is arranged on horizontal direction and is arranged on the IR cutoff filter of discharge lamp front.Discharge lamp comprises: bulb and having is arranged on the lamp reflector of the reflecting surface around the bulb, and this lamp reflector is used to reflect the light that sends from bulb and upwards launches this reflected light forwards.By the IR cutoff filter on downward direction slightly towards the reflecting surface reflection be included in send from bulb, by reflecting surface reflection and the ultrared step from the light that reflecting surface is forwards launched.
According to another embodiment of the invention, a kind of device for projection television is provided, this device comprises: framework, be connected in the rear projection type screen of framework front, be arranged on the optical unit on the framework, be used for projecting TV picture, and be connected in the catoptron that is used for the television image projected luminous flux of sending from optical unit is reflexed to the back side of rear projection type screen on the framework.This optical unit comprises the discharge lamp that is arranged on horizontal direction and is arranged on the UV-IR cutoff filter of discharge lamp front.Discharge lamp comprises: bulb and having is arranged on the lamp reflector of the reflecting surface around the bulb, and this lamp reflector is used to reflect the light that sends from bulb and upwards launches this reflected light forwards.By the UV-IR cutoff filter on downward direction slightly towards the reflecting surface reflection be included in send from bulb, by reflecting surface reflection and ultraviolet ray and infrared ray from the light that reflecting surface is forwards launched.
In a word, by the light on the higher part of temperature of IR cutoff filter or UV-IR cutoff filter reflection reflecting surface that send from bulb and that be reflected in lamp reflector, so that it shines the reflecting surface temperature than lower part or escape into the reflecting surface outside.Therefore, the light that is reflected by IR cutoff filter or UV-IR cutoff filter no longer returns the higher part of temperature of reflecting surface, thereby has reduced the temperature difference between bulb top and the bottom.
Above-mentioned and other purpose of the present invention, feature and advantage will be by ensuing description and claims, and become in conjunction with the accompanying drawings obviously, and part or element identical in the accompanying drawing are represented with identical reference marker.
Description of drawings
Fig. 1 is the synoptic diagram that the present invention uses projection display device wherein;
Fig. 2 is the skeleton view that is used in the discharge lamp in the projection display device of Fig. 1;
Fig. 3 A is the sectional view of draw bail of discharge lamp of the projection display device of UV-IR cutoff filter and Fig. 1, and Fig. 3 B is the skeleton view of the draw bail of the UV-IR cutoff filter shown in Fig. 3 A;
Fig. 4 A relates to the discharge lamp of the embodiment of the invention and the synoptic diagram of UV-IR cutoff filter, and Fig. 4 B is the sectional view of UV-IR cutoff filter;
Fig. 5 tilts-4 ° the time track synoptic diagram of upside and downside reflection flux at UV-IR cutoff filter 21;
Fig. 6 is a similar diagram, but it is to tilt 4 ° the time track synoptic diagram of upside and downside reflection flux at UV-IR cutoff filter 21;
Fig. 7 A, 7B, 7C are the synoptic diagram of the different inverting methods of explanation UV-IR cutoff filter;
Fig. 8 A is the synoptic diagram that the present invention uses another projection display device wherein, and Fig. 8 B is a similar diagram, but it is the modification to the projection display device of Fig. 8 A;
Fig. 9 A is the synoptic diagram that the present invention uses another projection display device wherein, and Fig. 9 B is a similar diagram, but it is the modification to the projection display device of Fig. 9 A;
Figure 10 A and 10B are respectively the anterior elevational view and the side front elevations of device for projection television; And
Figure 11 is the synoptic diagram of existing projector.
Embodiment
First embodiment
At first with reference to Fig. 1, it illustrates the present invention's application projection display device wherein.Described projection display device 2 comprises housing 201, projecting lens 90, and the optical unit that is used for projected image 20 that is positioned at housing 201.
Optical unit 20 comprises the discharge lamp 10 that constitutes as the light source of projected image, lamp optical system 26, color separation optical system 30, as three liquid crystal board 60A, 60B and the 60C of the transmission-type liquid crystal type of device of respectively doing for oneself of light modulation portion (spatial optical modulation element), quadrature colour splitting prism 70 and relay optical system 80.Parts in the mentioned optical unit 20 are positioned at the cover 211 of optical unit 20.
The luminous flux that discharge lamp 10 sends guides to color separation optical system 30 and relay optical system 80 by lamp optical system 26, thus it is divided into red (R), green (G) and blue (B) three kinds of luminous fluxes.
The luminous flux of these three kinds of colors is modulated described luminous flux with it based on image information thus from three liquid crystal board 60A, 60B and 60C (spatial optical modulation element) transmission of the image information that shows red accordingly (R), green (G) and indigo plant (B) three kinds of colors respectively.Then, three kinds of luminous fluxes are synthesized single image projection luminous flux, and the image projection luminous flux is projected on the screen by projecting lens 90 by quadrature colour splitting prism 70.It should be noted that image information be from unshowned external device (ED) for example personal computer offer liquid crystal board 60A, 60B and 60C by what be incorporated into circuit the projection display device 2.
More particularly, it is horizontal alignment that discharge lamp 10 is arranged to its optical axis, and lamp optical system 26 is arranged on the front of discharge lamp 10.
Lamp optical system 26 comprises UV-IR cutoff filter 21 and the PS conversion element 24 that is arranged on the first light path 10A.The light that sends from discharge lamp 10 is reflexed to the second light path 10B of color separation optical system 30 by catoptron 341 after by UV-IR cutoff filter 21 and PS conversion element 24.The first light path 10A and the second light path 10B are perpendicular to one another crossing.
Color separation optical system 30 comprises dichronic mirror 301 that is arranged on the second light path 10B and the dichronic mirror 302 that is arranged on the second light path 10B extended line.
Two dichronic mirrors 301 and 302 are provided with like this, so that they become miter angle with the extended line of the second light path 10B and the second light path 10B.
The luminous flux that sends from lamp optical system 26 reflects via dichronic mirror 301, and passes liquid crystal board 60A by catoptron 344 and collector lens 351, arrives quadrature colour splitting prism 70 then.Hereinafter, will be from dichronic mirror 301 to catoptron 344 light path be called the 3rd light path 10C, the light path from catoptron 344 to quadrature colour splitting prism 70 is called the 4th light path 10D.In the present embodiment, the second light path 10B and the 3rd light path 10C are perpendicular to one another crossing, and the 3rd light path 10C and the 4th light path 10D also are perpendicular to one another crossing.
Luminous flux passes the part of dichronic mirror 301 via dichronic mirror 302 reflections, passes liquid crystal board 60B by collector lens 352 then, and arrives quadrature colour splitting prism 70.Hereinafter, will be from dichronic mirror 301 to dichronic mirror 302 light path be called the 5th light path 10E, the light path from dichronic mirror 302 to quadrature colour splitting prism 70 is called the 6th light path 10F.In the present embodiment, coaxial the second light path 10B and the 5th light path 10E are set, and the 5th light path 10E and the 6th light path 10F are perpendicular to one another crossing.
Pass the luminous flux that dichronic mirror 301 passes dichronic mirror 302 then, successively by constituting relay lens 381, catoptron 342, another relay lens 382 and the catoptron 343 of relay optical system 80, and further pass liquid crystal board 60C by collector lens 353, arrive quadrature colour splitting prism 70 then.Hereinafter, will be from dichronic mirror 302 to catoptron 342 light path be called the 7th light path 10G, will be from catoptron 342 to catoptron 343 light path be called the 8th light path 10H.In addition, hereinafter, the light path from catoptron 343 to quadrature colour splitting prism 70 is called the 9th light path 10I.In the present embodiment, the 7th light path 10G and the 8th light path 10H are perpendicular to one another crossing, and the 8th light path 10H and the 9th light path 10I also are perpendicular to one another crossing.
The luminous flux that sends from the output face 70A of cross prisms 70 enters projecting lens 90.Thereby, coloured image is formed on the screen by projecting lens 90.
As shown in Figure 3A and 3B, UV-IR cutoff filter 21 is arranged in the mode that tilts among the end 210A of cover 210 of discharge lamp 10 fronts.
As shown in Figure 2, discharge lamp 10 comprises lampshade 101, lamp reflector 14, bulb 11 and cover glass plate 15.
Lampshade 101 has rectangular aperture at its front end, and in lampshade 101 inside lamp reflector 14 is set.The a pair of cut-out 16A that allows cooling air to pass through of being used for is set in the upper and lower of lampshade 101 and lamp reflector 14 previous sections, and in each cut-out 16A, catch net 16B is set.
Cover glass plate 15 is set so that the opening of closed lampshade 101 front ends.
Therefore, will be transformed into directional light by the light of discharge emission between sparking electrode 12a and the 12b by reflecting surface 14A, and it will be passed cover glass plate 15 to front-reflection.
The connection of discharge lamp is described now.
With reference to Fig. 3 A and 3B, the end 210A that UV-IR cutoff filter 21 holds the cover 210 in it has the xsect of rectangular frame shape, and the cover lateral frame member 110 with rectangular frame shape xsect is connected in the base portion end of end 210A.
Simultaneously, the lamp lateral frame member 111 with rectangular frame shape xsect is connected in the front portion of lampshade 101.Lamp lateral frame member 111 inserts the inside of cover lateral frame member 110, and by screw framing component 110 and 111 is interfixed.
Thereby, support discharge lamps 10 by cover 210 by lamp lateral frame member 111 and cover lateral frame member 110.
It should be noted that because the amount of being blown into of air is depended in the variation of medial temperature between the upper and lower of bulb, so the temperature difference that control is located between the upper and lower that voltage on the fan 17 can make bulb 11 minimizes.
The connection of UV-IR cutoff filter 21 is described now.
Bottom at the inside surface of cover 210 end 210A is formed with groove 212, so that the lower end of UV-IR cutoff filter 21 is contained in wherein.Simultaneously, be formed with inclined-plane 213 on the top of the inside surface of end 210A, so that it can engage with the upper end of UV-IR cutoff filter 21.
UV-IR cutoff filter 21 is set like this,, and its upper end is remained to inclined-plane 213 by sheet spring 211 so that its lower end is contained in the groove 212.Sheet spring 211 is assembled on the roof of end 210A.
In downward-sloping mode UV-IR cutoff filter 21 is set, so that the top of UV-IR cutoff filter 21 is than the more close discharge lamp 10 in the bottom of UV-IR cutoff filter 21, like this, on downward direction slightly, be included in towards reflecting surface 14A reflection that send and from bulb 11 by the infrared ray and the ultraviolet ray of reflecting surface 14A to the reflection of light light of front-reflection.
Because UV-IR cutoff filter 21 is to be provided with in downward-sloping slightly mode, so brought the remarkable advantage of present embodiment, detailed advantage will be described below.
With reference to accompanying drawing 4A and 4B, the UV-IR cutoff filter 21 that is arranged on discharge lamp 10 fronts have be positioned on its optical input surface being used for by through the ultraviolet ray of reflection and ultrared UV-IR by film 22.Further, UV-IR cutoff filter 21 has and is applied to being used on its light gasing surface and suppresses anti-reflective film (AR film) 23 from the diffusion reflection of light of optical unit 20.
The light that sends from bulb 11 is transformed into parallel luminous flux and arrives UV-IR cutoff filter 21 by reflecting surface 14A.To be included in UV-IR light (ultraviolet ray and infrared ray) reflection in the incident light that arrives UV-IR cutoff filter 21 by film 22 to reflecting surface 14A by UV-IR, thus with its secondary reflection again.Here, with (hereinafter in downward direction, downward direction is called-direction) mode that goes up a spot of inclination is provided with UV-IR cutoff filter 21, so that the top of the more close reflecting surface 14A in the top of UV-IR cutoff filter 21, perhaps with (hereinafter in the direction that makes progress, downward direction is called+direction) mode that tilts is provided with UV-IR cutoff filter 21, so that the top of UV-IR cutoff filter 21 is away from the top of reflecting surface 14A, the UV-IR light by 21 reflections of UV-IR cutoff filter arrives reflecting surface 14A in downward slightly direction or on the direction that more makes progress like this.Thereby the UV-IR light that arrives the upper and lower of bulb 11 via lamp reflector 14 reflections has different incident light quantities each other, and therefore changes the temperature of top or bottom.
The temperature difference between the upper and lower of bulb 11 is for hour, and the inclination angle of UV-IR cutoff filter 21 is most preferred, and in this embodiment, the inclination angle is set to-4 °.
Effect when carrying out following experiment and confirming that the inclination angle of UV-IR cutoff filter 21 changes.
Experiment 1
Experiment condition:
Discharge lamp: 190w ultrahigh pressure mercury lamp
The air gap of lamp reflector: 10mm * 10mm
Be applied to and be used for being blown into voltage on the fan of air: 5.5v by air gap
In the experiment, to be made as reference angle (0 °) perpendicular to the angle of UV-IR cutoff filter 21 optical axises, the inclination angle of implementing UV-IR cutoff filter 21 successively is set to 1) 4 °, 2) 0 ° and 3)-4 ° and 4) without optical filter, and the temperature of measuring the upper and lower of bulb 11 is determined the temperature difference between the upper and lower of bulb 11.Experimental result is listed in the following table 1:
Table 1
| The inclination angle of UV-IR cutoff filter | The bulb upper temp | The bulb temperature of lower | The temperature difference | |
| 1 | 4° | 860℃ | 800℃ | 60℃ |
| 2 | 0° | 850℃ | 820℃ | 30℃ |
| 3 | -4° | 840℃ | 840℃ | 0℃ |
| 4 | No UV-IR cutoff filter | 820℃ | 760℃ | 60℃ |
According to above-mentioned experiment, by being set like this, UV-IR cutoff filter 21 obtains by 0 ° of inclination angle with reference to-4 ° of inclination angle inclinations, and the temperature difference between bulb 11 upper and lowers reduces to 0 ℃ from 30 ℃.
Experiment 2
Experiment condition:
Discharge lamp: 150w ultrahigh pressure mercury lamp
Other conditions: with experiment the same in 1
In the experiment, and the inclination angle that UV-IR cutoff filter 21 is similarly implemented in top experiment 1 successively is set to 1) 4 °, 2) 0 ° and 3)-4 ° and 4) determine the temperature difference between the upper and lower of bulb 11 without optical filter.Thereby, by being set like this, UV-IR cutoff filter 21 obtains tilting-4 ° with reference to the inclination angle by 0 °, and the temperature difference between bulb 11 upper and lowers reduces to 35 ℃ from 95 ℃.
From above-mentioned experiment, confirmed successfully that the inclination angle of catoptrical UV-IR cutoff filter 21 that can be by utilizing UV-IR cutoff filter 21 reduces the temperature difference of bulb 11.
Now, the reason that the temperature difference between the upper and lower of bulb 11 changes according to the inclination angle of UV-IR cutoff filter 21 is described.
Send, arrive the top of reflecting surface 14A and through its light to front-reflection from bulb 11, this moment is by 21 reflections of UV-IR cutoff filter and arrive the bottom of reflecting surface 14A or shine outside below the reflecting surface 14A, and does not turn back to the top of reflecting surface 14A.Thereby, when comparing with the temperature on the reflecting surface 14A top of routine configuration, the upper temp step-down of reflecting surface 14A, the temperature of reflecting surface 14A bottom is compared with the temperature of lower of the reflecting surface 14A of routine configuration and is uprised simultaneously.
To be described in more detail below.
At the UV-IR cutoff filter is 1) tilt-4 ° and 2) under 4 ° the condition of tilting, design lamp optical system and the luminous flux that utilizes assessment software Odis Ver.70 to carry out from the return projector of UV-IR cutoff filter 21 scan.The optical track mark explanation in Fig. 5 and 6 that obtains.
As shown in Figure 5, UV-IR cutoff filter 21 tilts-4 ° the time, from bulb 11 send through the upper and lower output light flux a1 of reflecting surface 14A and b1 by UV-IR cutoff filter 21 reflections of-4 ° of inclinations and produce downward-sloping slightly optical filter folded light beam a2 and b2 respectively.Optical filter beam reflected a2 and b2 further be reflected face 14A again secondary reflection to produce reverberator light flux reflected a3 and b3 respectively.As shown in Figure 5, reverberator light flux reflected a3 and b3 are reflected the further reflection of face 14A with generation reverberator light flux reflected a4 and b4, and outgoing downwards separately.Therefore, think that the bottom of bulb 11 is heated and the temperature on bulb 11 tops does not remain unchanged, thereby the temperature difference between the upper and lower of bulb 11 reduces.
On the contrary, as shown in Figure 6, UV-IR cutoff filter 21 tilts 4 ° the time, from bulb 11 send through the upper and lower output light flux a1 of reflecting surface 14A and b1 by UV-IR cutoff filter 21 reflections of 4 ° of inclinations and produce the light beam a2 and the b2 that more make progress of the reflection of inclination optical filter respectively.Optical filter beam reflected a2 and b2 further be reflected face 14A again secondary reflection to produce reverberator light flux reflected a3 and b3 respectively.As shown in Figure 6, reverberator light flux reflected a3 and b3 are reflected the further reflection of face 14A with generation reverberator light flux reflected a4 and b4, and upwards overflow separately.Therefore, it is believed that to heat up in the top of bulb 11, thus the temperature difference between the upper and lower of increase bulb 11.
Therefore,, only just can reduce the temperature difference between the bulb upper and lower without any need for special device by the UV-IR cutoff filter being set in the inclination mode according to present embodiment, thereby, life-span of discharge lamp can be prolonged.
Projection display device can be used to comprise as setting firmly device and as two kinds of application modes of suspender.When comparing as the situation that sets firmly device shown in Fig. 7 A with projection display device wherein, projection display device is during as suspender shown in Fig. 7 B or 7C, the top A of bulb reverses with bottom B is vertical, and, the inclination angle of the UV-IR cutoff filter 21 that also needs to reverse.As the mechanism at the inclination angle of the UV-IR cutoff filter 21 that is used for reversing, as shown in Fig. 7 B, rotating mechanism can be arranged to the pivot 21P rotation on the left and right sides end face that is positioned at UV-IR cutoff filter 21.Selectively, the displacement mechanism that the end with in UV-IR cutoff filter 21 upper and lower sides as shown in Fig. 7 C moves around the other end can be set.
Second embodiment
Now, describe according to a second embodiment of the present invention.
Shown in Fig. 8 A is a part according to the projection display device of second embodiment.
Second embodiment is that other was similar to first embodiment sensing downwards and catoptron 401A were arranged between discharge lamp 10 and the PS conversion element 24 except discharge lamp 10.
In the present embodiment, form UV-IR cutoff filter 21A, especially UV-IR by film 22, so that it has the curved surface that raises up as shown in Fig. 8 A.
In a second embodiment, the guiding reflecting surface 14A that sends from discharge electrode 12a and 12b and via light this moment of its reflection downwards by of the periphery reflection of the curved surface of UV-IR cutoff filter 21A projection to reflecting surface 14A.
Therefore, do not return the top of reflecting surface 14A via the reflected light of UV-IR cutoff filter 21A reflection and arrive the bottom of reflecting surface 14A.So, to compare with the routine configuration, the temperature on reflecting surface 14A top reduces, and can reduce the temperature difference between the bulb upper and lower, thereby can prolong the life-span of discharge lamp.
Shown in Fig. 8 B is the modification of second embodiment.
With reference to Fig. 8 B, in this modification, UV-IR cutoff filter 21B, especially UV-IR for example, are formed by the curved surface to lower convexity by film 22.
In this modification, the arrival reflecting surface 14A that sends from discharge electrode 12a and 12b and via the light of its reflection by of the periphery reflection of the curved surface of UV-IR cutoff filter 21B projection to reflecting surface 14A.
Therefore, arrive the bottom of reflecting surface 14A via the reflected light of UV-IR cutoff filter 21B reflection and do not turn back to the top of reflecting surface 14A.So, to compare with the routine configuration, the temperature on reflecting surface 14A top reduces, and can reduce the temperature difference between the bulb upper and lower, thereby can prolong the life-span of discharge lamp.
It should be noted that, become UV-IR cutoff filter 21A to replace the curved surface shown in Fig. 8 B with conical surface form second embodiment variant, also can demonstrate similar effect to lower convexity to lower convexity with curved surface that raises up or the UV-IR cutoff filter 21B shown in the conical surface form replacement Fig. 8 A that raises up.
The 3rd embodiment
Shown in Fig. 9 A is a part according to the projection display device of third embodiment of the invention.
The 3rd embodiment is to be directed upwards towards and catoptron 401B was arranged between discharge lamp 10 and the PS conversion element 24, other was similar to first embodiment except discharge lamp 10.
In the present embodiment, form UV-IR cutoff filter 21D, especially UV-IR by film 22, so that it has the curved surface to lower convexity as shown in Fig. 9 A.In this case, the inclined-plane of the curved surface of preferred UV-IR cutoff filter 21D has the steeper slope in inclined-plane than the curved surface of the UV-IR cutoff filter 21A among second embodiment.
In the 3rd embodiment, the guiding reflecting surface 14A that sends from discharge electrode 12a and 12b and via its upwards light of reflection by the periphery reflection of UV-IR cutoff filter 21D to reflecting surface 14A.Simultaneously, the light that reflects from the top of reflecting surface 14A is not turned back to the top of reflecting surface 14A with the outside that escapes into lamp reflector 14 by the camber reflection of UV-IR cutoff filter 21D projection.
Therefore, compare with the routine configuration, the upper temp of reflecting surface 14A reduces, and can reduce the temperature difference between the bulb upper and lower, in addition, to similar among first embodiment, can prolong the life-span of discharge lamp.
Shown in Fig. 9 B is the modification of the 3rd embodiment.
With reference to Fig. 9 B, in this modification, UV-IR cutoff filter 21E, especially UV-IR for example, are formed by the curved surface that raises up by film 22.In this case, the inclined-plane of the curved surface of preferred UV-IR cutoff filter 21E has the steeper slope in inclined-plane than the curved surface of the UV-IR cutoff filter 21B among second embodiment.
In this modification, the arrival reflecting surface 14A that sends from discharge electrode 12a and 12b and via the light of its reflection by of the periphery reflection of the curved surface of UV-IR cutoff filter 21E projection to reflecting surface 14A.Thereby, be reflected so that it escapes into the outside of lamp reflector 14 from the light of reflecting surface 14A top reflection.
Therefore, compare with the routine configuration, the temperature on reflecting surface 14A top reduces, and can reduce the temperature difference between the bulb upper and lower, thereby can prolong the life-span of discharge lamp.
It should be noted that, becoming UV-IR cutoff filter 21D to replace curved surface or the UV-IR cutoff filter 21E to lower convexity shown in Fig. 9 A with the conical surface form to lower convexity the 3rd embodiment variant replaces the curved surface that raises up shown in Fig. 9 B with the conical surface form that raises up, also can demonstrate similar effect.
Optical unit among above described first to the 3rd embodiment for example also can be applied in the device for projection television 500 shown in Figure 10 A and 10B.
Below, device for projection television 500 will be described.
With reference to Figure 10 A and 10B, device for projection television 500 comprises optical unit 510, catoptron (not shown) and the rear projection type screen 550 that is positioned at its inner framework, is used for the television image projection.
Device for projection television 500 comprises that also image information produces circuit, it is picture signal and voice signal with the television signal decoder of receiving, carries out for the signal Processing of picture signal necessity red to produce (R), green (G) and blue (B) trichromatic image information and with picture signal and supplies with optical unit 510.
Catoptron is set in place above the optical unit 510 at rear projection type screen 550 back sides, and will reflex to the back side of rear projection type screen 550 from the television image projected luminous flux that optical unit 510 sends.By being projected to the back side by the television image projected luminous flux of mirror reflects, rear projection type screen 550 shows television image in front.
Rear projection type screen 550 is formed by Fresnel lens that for example is arranged on the image source and the lenticulated screen (lenticular screen) that is arranged on the Fresnel lens next stage.Another screen can be set in addition to descend and the protection lenticulated screen to reduce the contrast that is caused by exterior light.
The present invention also goes for the IR optical filter or the UV-IR optical filter that become relative mode to be provided with the discharge lamp of the optical unit of the device for projection television 500 with above-mentioned structure.
It should be noted that, though in the above-described embodiments, UV-IR cutoff filter 21 is provided with in the mode relative with bulb 11, but, utilizing the IR cutoff filter to replace the occasion of UV-IR cutoff filter 21 equally, that send from bulb by IR cutoff filter reflection and reflect in the relatively-high temperature part of reflecting surface so that partly shine the light that infrared light (infrared ray) or guiding infrared light escape into the reflecting surface outside to the relative low temperature of reflecting surface, also can reduce the temperature difference between the bulb upper and lower naturally.
Further, though, in the above-described embodiments, the liquid crystal panel that is made of the transmission-type liquid crystal device is used as the optical modulator component (spatial optical modulation element) based on the image information modulated flux in the optical unit, but this spatial optical modulation element can be any element based on the image information modulated flux.Therefore, for example, can utilize the liquid crystal panel that constitutes by reflective liquid crystal device, perhaps can utilize to be called as DMD (digital micro-mirror device), comprise that promptly corresponding single pixel comes the element of the very little catoptron of reflection flux.It should be noted that DMD is widely used in the rear-projection TV device of projection display device and DLP (digital light processing) system.
Further, in the present invention, the discharge lamp of horizontal direction setting is not limited to only be oriented on the strict horizontal direction, also can comprise the discharge lamp that tilts in relative horizontal direction mode slightly up or down naturally.
Though, utilized specific conditions to describe the preferred embodiments of the present invention,, this description is understandable that just for illustrative purposes under the prerequisite of the spirit or scope that do not break away from claim subsequently, it can be made and change and change.
Claims (30)
1, a kind of minimizing is arranged on the method for the temperature difference between the upper and lower of bulb of the discharge lamp in the device in the horizontal direction, except described discharge lamp, described device also comprises the IR cutoff filter that is arranged on described discharge lamp front, except described bulb, described discharge lamp also comprises, have and be arranged on around the described bulb, said method comprising the steps of to be used to reflect the light that sends from described bulb and forwards upwards to launch a lamp reflector of this catoptrical reflecting surface:
By described IR cutoff filter be included in towards the reflection of described reflecting surface on the downward slightly direction send from described bulb, by described reflecting surface reflection and from described reflecting surface at the infrared ray the light of emission upwards forwards.
2, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 1, wherein, described IR cutoff filter is arranged to make it to extend on a plane, and is provided with in the mode that tilts, so that described discharge lamp is more approached than its underpart in its top.
3, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 1, wherein, described reflecting surface is made of the symmetrical parabola of rotation, and described bulb has and is used for luminous sparking electrode, and described electrode is arranged on the focus of the symmetrical paraboloidal rotation axes of symmetry of described rotation.
4, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 1, wherein, described lamp reflector have be formed on wherein be used to allow cooling air to enter so that cool off an excision part of described bulb by cooling air.
5, the method for the temperature difference between a kind of upper and lower of reducing the bulb on downward direction, be arranged on the discharge lamp in the device, except described discharge lamp, described device also comprises, be arranged on the IR cutoff filter of described discharge lamp downside, except described bulb, described discharge lamp also comprises, have and be arranged on being used to around the described bulb and reflect the light that sends from described bulb and, said method comprising the steps of at a lamp reflector of this catoptrical reflecting surface of downward direction emission:
By described IR cutoff filter reflection on a direction of the periphery of described reflecting surface be included in send from described bulb, by described reflecting surface reflection and from described reflecting surface at the infrared ray the light of emission upwards forwards.
6, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 5, wherein, the described reflecting surface of described IR cutoff filter forms the curved surface or the taper surface of projection on downward direction or the direction that makes progress.
7, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 5, wherein, described reflecting surface is made of the symmetrical parabola of rotation, and described bulb has and is used for luminous sparking electrode, and described electrode is arranged on the focus of the symmetrical paraboloidal rotation axes of symmetry of described rotation.
8, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 5, wherein, described lamp reflector have be formed on wherein be used to allow cooling air to enter so that cool off an excision part of described bulb by cooling air.
9, the method for the temperature difference between the upper and lower of the bulb of the discharge lamp of a kind of minimizing in upwards being arranged on a device upward, except described discharge lamp, described device also comprises, be arranged on the IR cutoff filter of described discharge lamp upside, except described bulb, described discharge lamp also comprises, have and be arranged on being used to around the described bulb and reflect the light that sends from described bulb and, said method comprising the steps of at the lamp reflector of upwards launching this catoptrical reflecting surface upward:
By described IR cutoff filter reflection on a direction of the periphery of described reflecting surface be included in send from described bulb, by described reflecting surface reflection and the infrared ray from the light that the direction that described reflecting surface is making progress is launched.
10, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 9, wherein, the described reflecting surface of described IR cutoff filter forms the curved surface or the taper surface of projection on downward direction or the direction that makes progress.
11, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 9, wherein, described reflecting surface is made of the symmetrical parabola of rotation, and described bulb has and is used for luminous sparking electrode, and described electrode is arranged on the focus of the symmetrical paraboloidal rotation axes of symmetry of described rotation.
12, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 9, wherein, described lamp reflector have be formed on wherein be used to allow cooling air to enter so that cool off an excision part of described bulb by cooling air.
13, a kind of minimizing is arranged on the method for the temperature difference between the upper and lower of bulb of the discharge lamp in the device in the horizontal direction, except described discharge lamp, described device also comprises, be arranged on a UV-IR cutoff filter of described discharge lamp front, except described bulb, described discharge lamp also comprises, have and be arranged on being used to around the described bulb and reflect the light that sends from described bulb and forwards upwards launching a lamp reflector of this catoptrical reflecting surface, said method comprising the steps of:
By described UV-IR cutoff filter be included in towards described reflecting surface reflection on the downward direction slightly send from described bulb, by described reflecting surface reflection and from described reflecting surface at the infrared ray the light of emission upwards forwards.
14, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 13, wherein, described IR cutoff filter is arranged to make it to extend on a plane, and is provided with in the mode that tilts, so that described discharge lamp is more approached than its underpart in its top.
15, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 13, wherein, described reflecting surface is made of the symmetrical parabola of rotation, and described bulb has and is used for luminous electrode, and described electrode is arranged on the focus of the symmetrical paraboloidal rotation axes of symmetry of described rotation.
16, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 13, wherein, described lamp reflector have be formed on wherein be used to allow cooling air to enter so that cool off an excision part of described bulb by cooling air.
17, the method for the temperature difference between a kind of upper and lower of reducing the bulb on downward direction, be arranged on the discharge lamp in the device, except described discharge lamp, described device also comprises, be arranged on a UV-IR cutoff filter of described discharge lamp downside, except described bulb, described discharge lamp also comprises, have and be arranged on being used to around the described bulb and reflect the light that sends from described bulb, an and lamp reflector of this catoptrical reflecting surface of emission downwards, said method comprising the steps of:
By described UV-IR cutoff filter be included in from the light that described bulb sends in reflection on a direction of the periphery of described reflecting surface, by described reflecting surface reflection and the infrared ray launched in downward direction from described reflecting surface.
18, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 17, wherein, the described reflecting surface of described UV-IR cutoff filter forms downward direction or the curved surface or the taper surface of the direction projection that makes progress.
19, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 17, wherein, described reflecting surface is made of the symmetrical parabola of rotation, and described bulb has and is used for luminous sparking electrode, and described electrode is arranged on the focus of the symmetrical paraboloidal rotation axes of symmetry of described rotation.
20, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 17, wherein, described lamp reflector have be formed on wherein be used to allow cooling air to enter so that cool off an excision part of described bulb by cooling air.
21, the method for the temperature difference between the upper and lower of the bulb of the discharge lamp of a kind of minimizing in upwards being arranged on a device upward, except described discharge lamp, described device also comprises, be arranged on a UV-IR cutoff filter of described discharge lamp upside, except described bulb, described discharge lamp also comprises, have and be arranged on that being used to around the described bulb reflected the light that sends from described bulb and at a lamp reflector of upwards launching this catoptrical reflecting surface upward, described method comprises:
By described UV-IR cutoff filter reflection on a direction of the periphery of described reflecting surface be included in send from described bulb, by described reflecting surface reflection and the infrared ray from the light that the direction that described reflecting surface is making progress is launched.
22, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 21, wherein, the described reflecting surface of described IR cutoff filter forms downward direction or the curved surface or the taper surface of the direction projection that makes progress.
23, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 21, wherein, described reflecting surface is made of the symmetrical parabola of rotation, and described bulb has and is used for luminous sparking electrode, and described electrode is arranged on the focus of the symmetrical paraboloidal rotation axes of symmetry of described rotation.
24, according to the method for the temperature difference between the upper and lower of the minimizing bulb of claim 21, wherein, described lamp reflector have be formed on wherein be used to allow cooling air to enter so that cool off an excision part of described bulb by cooling air.
25, a kind of optical unit comprises:
A discharge lamp that is used for projected image in the horizontal direction is set; And
Be arranged on an IR cutoff filter of described discharge lamp front,
Described discharge lamp comprises that a bulb and having is arranged on being used to around the described bulb and reflects the light that sends from described bulb and forwards upwards launching a lamp reflector of this catoptrical reflecting surface,
Wherein, by described IR cutoff filter on the downward direction slightly towards described reflecting surface reflection be included in send from described bulb, by described reflecting surface reflection and from the infrared ray of described reflecting surface the light of emission forwards.
26, a kind of optical unit comprises:
A discharge lamp that is used for projected image in the horizontal direction is set; And
Be arranged on a UV-IR cutoff filter of described discharge lamp front,
Described discharge lamp comprises that a bulb and having is arranged on being used to around the described bulb and reflects the light that sends from described bulb and forwards upwards launching a lamp reflector of this catoptrical reflecting surface,
Wherein, by described UV-IR cutoff filter on the downward direction slightly towards described reflecting surface reflection be included in send from described bulb, by described reflecting surface reflection and from ultraviolet ray and the infrared ray of described reflecting surface the light of forwards upwards launching.
27, a kind of projection display device comprises:
Be used for the optical unit of projected image to the screen,
Described optical unit comprises a setting discharge lamp in the horizontal direction and an IR cutoff filter that is arranged on described discharge lamp front,
Described discharge lamp comprises that a bulb and having is arranged on being used to around the described bulb and reflects the light that sends from described bulb and forwards upwards launching a lamp reflector of this catoptrical reflecting surface,
Wherein, by described IR cutoff filter be included in towards described reflecting surface reflection on the downward direction slightly send from described bulb, by described reflecting surface reflection and from described reflecting surface at the infrared ray the light of emission upwards forwards.
28, a kind of projection display device comprises:
Be used for the optical unit of projected image to the screen,
Described optical unit comprises a setting discharge lamp in the horizontal direction and a UV-IR cutoff filter that is arranged on described discharge lamp front,
Described discharge lamp comprises a bulb and has and be arranged on being used to around the described bulb and reflect the light that sends from described bulb and forwards upwards launching a lamp reflector of this catoptrical reflecting surface,
Wherein, by described UV-IR cutoff filter on the downward direction slightly towards described reflecting surface reflection be included in send from described bulb, by described reflecting surface reflection and from ultraviolet ray and the infrared ray of described reflecting surface the light of forwards upwards launching.
29, a kind of device for projection television comprises:
One framework;
Be connected in a rear projection type screen in the front of described framework;
Be arranged on an optical unit that is used for projecting TV picture on the described framework; And
Be connected in the catoptron on the described framework, it is used for the television image projected luminous flux of sending from described optical unit is reflexed to the back side of described rear projection type screen,
Described optical unit comprises a setting discharge lamp in the horizontal direction and an IR cutoff filter that is arranged on described discharge lamp front,
Described discharge lamp comprises a bulb and has and be arranged on being used to around the described bulb and reflect the light that sends from described bulb and forwards upwards launching a lamp reflector of this catoptrical reflecting surface,
Wherein, by described IR cutoff filter be included in towards described reflecting surface reflection on the downward direction slightly send from described bulb, by described reflecting surface reflection and from described reflecting surface at the infrared ray the light of emission upwards forwards.
30, a kind of device for projection television comprises:
One framework;
Be connected in a rear projection type screen of described framework front;
Be arranged on the optical unit on the described framework, it is used for projecting TV picture; And
Be connected in the catoptron on the described framework, it is used for the television image projected luminous flux of sending from described optical unit is reflexed to the back side of described rear projection type screen,
Described optical unit comprises a setting discharge lamp in the horizontal direction and a UV-IR cutoff filter that is arranged on described discharge lamp front,
Described discharge lamp comprises a bulb and has and be arranged on being used to around the described bulb and reflect the light that sends from described bulb and forwards upwards launching a lamp reflector of this catoptrical reflecting surface,
Wherein, by described UV-IR cutoff filter on the downward direction slightly towards described reflecting surface reflection be included in send from described bulb, by described reflecting surface reflection and from ultraviolet ray and the infrared ray of described reflecting surface the light of forwards upwards launching.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004193802 | 2004-06-30 | ||
| JP193802/04 | 2004-06-30 | ||
| JP138884/05 | 2005-05-11 |
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| Publication Number | Publication Date |
|---|---|
| CN1716085A true CN1716085A (en) | 2006-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510087851 Pending CN1716085A (en) | 2004-06-30 | 2005-06-30 | Method of reducing the temperature difference between upper and lower portions of a lamp bulb, optical unit and projection apparatus |
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| CN (1) | CN1716085A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866569A (en) * | 2011-07-05 | 2013-01-09 | 精工爱普生株式会社 | Projector and control method of the same |
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2005
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866569A (en) * | 2011-07-05 | 2013-01-09 | 精工爱普生株式会社 | Projector and control method of the same |
| CN102866569B (en) * | 2011-07-05 | 2015-04-08 | 精工爱普生株式会社 | Projector and control method of the same |
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