CN101082403A - Light source device - Google Patents
Light source device Download PDFInfo
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- CN101082403A CN101082403A CN 200710105095 CN200710105095A CN101082403A CN 101082403 A CN101082403 A CN 101082403A CN 200710105095 CN200710105095 CN 200710105095 CN 200710105095 A CN200710105095 A CN 200710105095A CN 101082403 A CN101082403 A CN 101082403A
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Abstract
To provide a light source device comprising a discharge lamp, and a concave reflector having an ellipsoidal front reflector part provided with a light exit opening, and a spherical central reflector part continued to the rear side of the ellipsoidal front reflector part, and having high light utilization efficiency by reducing a ratio of light absorbed in an arc tube part of the discharge lamp by preventing light entered into the spherical central reflector part from passing an arc center and reciprocating a straight line connecting arbitrary two points on the reflecting surface of the spherical central reflector part. This light source device is provided with: the discharge lamp in which, within a discharge vessel, a pair of electrodes are arranged oppositely to each other; and the concave reflector which has the ellipsoidal front reflector part which is provided with the light exit opening, and the spherical reflector part which continues to the rear end of the ellipsoidal front reflector part. The light source device is characterized in that the middle between the electrodes of the discharge lamp is arranged with respect to the concave reflector to be located in front of a virtual plane which includes the boundary part between the ellipsoidal front reflector part and the spherical reflector part.
Description
Technical field
The present invention relates to a kind of light supply apparatus, be used in liquid crystal indicator, the bias light of DLP (registration mark) the porjection type projection arrangements such as (Digital Light Processors) of (registration mark) (the digital mirroring apparatus) that utilize DMD.
Background technology
In the projection arrangement of porjection type, require rectangular screen with even and enough color rendition irradiation images.In order to tackle this requirement, short arc super high voltage mercury vapor lamp and concave mirror such as elliptical mirror the combine use of the mercury steam pressure in the time of will lighting as light source more than 150 atmospheric pressure.
In recent years, projection arrangement user strong request projection arrangement is not to set up in meeting room etc., but can carry so that use in various occasions therefore projection arrangement compared with the past miniaturization just gradually like a cork.And, along with the miniaturization of projection arrangement, particularly also miniaturization gradually of concave mirror in the light supply apparatus.
Yet, merely make the concave mirror miniaturization, can reduce the specular cross section of concave mirror, from the light beam minimizing of light supply apparatus radiation.And, in recent years except the miniaturization of above-mentioned light supply apparatus, also require the illumination of the focal point of projection arrangement to reach than higher in the past level, therefore only concave mirror is carried out miniaturization can't tackle this requirement.
Here, can improve the technology of the utilization ratio of light beam as the specular cross section that does not reduce concave mirror, disclose the light supply apparatus with the concave mirror that is made of following speculum portion in No. the 3557988th, patent: speculum portion in the place ahead forms the light emission mouth; Central mirror portion is positioned at the rear of the place ahead speculum portion; And rearview mirror portion, be positioned at the rear of central mirror portion.Below, utilize Fig. 4 that the disclosed light supply apparatus of above-mentioned communique is described.
Fig. 4 is the sectional view of the general configuration of expression conventional lighting sources device.
In Fig. 4, light supply apparatus 10 is made of discharge lamp 1 and concave mirror 2.Discharge lamp 1 is the discharge lamp of direct current lighting mode, is relatively set with anode 13 and negative electrode 14 in the inside of luminous tube portion 11.The identical state of direction (anode 13 and negative electrode 14 relative direction) that concave mirror 2 is set to its optical axis Z and the arc light of discharge lamp 1 centers on discharge lamp 1.
The integral body of concave mirror 2 is concave shape, and be made of following 3 mirror portion: the place ahead speculum portion 22 has light emission mouth 21 forwardly; Central mirror portion 24 continues with the rear end side of the place ahead speculum portion 22; And rearview mirror portion 26, continue with the rear end side of central mirror portion 24.
And, the position of the 1st focus of the center of the position of the 1st focus of the elliptical mirror of the place ahead speculum portion 22, the spherical reflector of central mirror portion 24 and the elliptical mirror of rearview mirror portion 26 is identical, all central consistent with the arc light of discharge lamp 1 roughly.In discharge lamp shown in Figure 3, be the central authorities of arc light near the front end of negative electrode 14.In addition, the position of the 2nd focus of the elliptical mirror of the position of the 2nd focus of the elliptical mirror of the place ahead speculum portion 22 and rearview mirror portion 26 is identical.
Forwardly in the speculum portion 22, the front-end edge that forms light emission mouth 21 is positioned on the position of greatly forwards stretching out than the luminous tube portion 11 of discharge lamp 1, and ora terminalis continues with the front-end edge of central mirror portion 24 on as upper/lower positions thereafter: near the rear slightly the center of the arc light in the discharge lamp 1, and the place ahead slightly of the center between the anode 13, negative electrode 14.In addition, the front-end edge of the end edge of central mirror portion 24 and rearview mirror portion 26 continues.
Light supply apparatus according to said structure, near the arc light radiation of light from the front end of the negative electrode 14 of discharge lamp 1, forming, but as shown in Figure 5, incide that light in the place ahead speculum portion 22 directly is reflected and forwards radiate, thereby be concentrated on the position of the 2nd focus of the place ahead speculum portion 22 from the light emission mouth 21 of the front-end edge of the place ahead speculum portion 22.
On the other hand, because central consistent with arc light roughly as the center of the central mirror portion 24 of sphere, therefore from the light of arc light radiation, the light that incides in the central mirror portion 24 at rear of the place ahead speculum portion 22 returns towards arc light, and then pass arc light speculum portion 22 radiation forwards, thereby reflection and be concentrated on the position of the 2nd focus in the speculum portion 22 forwardly.
According to light supply apparatus with the concave mirror 2 that constitutes by above-mentioned 3 mirror portion, except inciding as the place ahead speculum portion 22 of elliptical mirror and as the light in the central mirror portion 24 of spherical reflector, can also will fail a part of light at the directive arc light rear that effectively utilizes by the rearview mirror portion 26 as elliptical mirror directly is concentrated on the place ahead in the past, so the utilization ratio of light improves.
But, in above-mentioned light supply apparatus,, be difficult to make the illumination at the focal point place of projection arrangement to reach more than in recent years the desired level of projection arrangement owing to following reason.
In the hatched example areas in Fig. 5, shown in dotted arrow, near the light of the radiation of the arc light the front end of the negative electrode 14 that is formed at discharge lamp 1, to with the light of the direction of optical axis Z quadrature radiation and to the optical axis Z light of the direction radiation of quadrature roughly, after inciding in the spherical reflector portion 24, return towards arc light, pass arc light and incide once more in the spherical reflector portion 24.Thereby, the light that above-mentioned with dashed lines arrow is represented is repeatedly back and forth on any 2 straight lines that couple together on the spherical reflective surface of arc light center and central mirror portion 24, soon promptly absorbed thus by luminous tube portion 11, can be by the place ahead speculum portion 22 from 21 radiation of light emission mouth.
And from all light of arc light radiation, if increased by the ratio of the light of luminous tube portion 11 absorptions, then have following bad result: the illumination at the focal point place of projection arrangement reduces, and can not satisfy the level of hope.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of light supply apparatus, constitute by discharge lamp and concave mirror, this concave mirror have the place ahead elliptical mirror portion of being provided with the light emission mouth and with the spherical reflector portion of the backhaul of the place ahead elliptical mirror portion, the light that suppresses to incide spherical reflector portion is back and forth on any 2 straight lines that couple together on the reflecting surface of arc light center and spherical reflector portion, reduce by the ratio of the light of the luminous tube portion of discharge lamp absorption, thus the utilization ratio of raising light.
In order to solve above-mentioned problem, light supply apparatus of the present invention comprises: discharge lamp, and pair of electrodes is oppositely arranged in discharge vessel; And concave mirror, have the place ahead elliptical mirror portion of being provided with the light emission mouth and with the spherical reflector portion of the backhaul of the place ahead elliptical mirror portion, above-mentioned light supply apparatus is characterised in that:
The above-mentioned relatively concave mirror of above-mentioned discharge lamp is arranged to, and it is interelectrode to be centered close to the front side of the imaginary plane of the boundary portion that comprises above-mentioned the place ahead elliptical mirror portion and above-mentioned spherical reflector portion.
And then, above-mentioned light supply apparatus is characterised in that: above-mentioned light supply apparatus, on the cross section of blocking with the plane that comprises its optical axis, satisfy the relation of 90 °＜X＜100 °, above-mentioned angle X is formed by following two straight lines: straight line of drawing to the boundary portion of above-mentioned the place ahead elliptical mirror portion and above-mentioned spherical reflector portion from above-mentioned interelectrode center and the straight line that is parallel to the extension of optical axis direction light emission direction from above-mentioned interelectrode center.
And then above-mentioned light supply apparatus is characterised in that: above-mentioned concave mirror has the rear elliptical mirror portion with the backhaul of above-mentioned spherical reflector portion.
And then concave mirror of the present invention has: elliptical mirror portion in the place ahead is provided with the light emission mouth; Spherical reflector portion is with the backhaul of the place ahead elliptical mirror portion; And rear elliptical mirror portion, with the backhaul of spherical reflector portion, above-mentioned concave mirror is characterised in that:
The 1st focus of the 1st focus of above-mentioned the place ahead elliptical mirror portion and above-mentioned rear elliptical mirror portion is positioned at the place ahead of the imaginary plane of the boundary portion that comprises above-mentioned the place ahead elliptical mirror portion and above-mentioned spherical reflector portion.
According to the present invention, light supply apparatus is made of discharge lamp and concave mirror, above-mentioned discharge lamp pair of electrodes in discharge vessel is oppositely arranged, above-mentioned concave mirror have the place ahead elliptical mirror portion of being provided with the light emission mouth and with the spherical reflector portion of the backhaul of the place ahead elliptical mirror portion, in above-mentioned light supply apparatus, the above-mentioned relatively concave mirror of above-mentioned discharge lamp is arranged to, it is interelectrode to be centered close to the front side of the imaginary plane of the boundary portion that comprises above-mentioned the place ahead elliptical mirror portion and above-mentioned spherical reflector portion, therefore return towards arc light at all light that from the light of arc light radiation, incide in the spherical reflector portion, thereby after passing arc light and inciding in the elliptical mirror portion of the place ahead, elliptical mirror portion reflects forwardly, thereby radiates and be concentrated on the position of the 2nd focus to light emission mouth direction.Thereby, incide light in the spherical reflector portion of concave mirror can be not back and forth on any 2 straight lines that couple together on the spherical reflective surface of arc light center and spherical reflector portion, so the light utilization ratio of light supply apparatus improves.
Description of drawings
Fig. 1 is the sectional view of length direction of the general configuration of expression light supply apparatus of the present invention.
Fig. 2 is the amplification sectional view of the electrode of the discharge lamp that the present invention relates to.
Fig. 3 is the key diagram of expression from the radiation state of the light of light supply apparatus of the present invention.
Fig. 4 is the sectional view of length direction of the general configuration of expression conventional lighting sources device.
Fig. 5 is the key diagram of expression from the radiation state of the light of conventional lighting sources device.
The specific embodiment
Below, utilize Fig. 1 to Fig. 3 that one example of light supply apparatus of the present invention is described.Fig. 1 is used to illustrate light supply apparatus of the present invention, is the sectional view that blocks with the plane that comprises optical axis.Fig. 2 is near the amplification sectional view the pair of electrodes that the present invention relates to.Fig. 3 is the key diagram of expression from the radiation state of the light of light supply apparatus of the present invention.As shown in Figure 1, light supply apparatus 10 constitutes: the sealing 12 of a side of discharge lamp 1 is set on the hole 29 of the end edge that is formed at concave mirror 2, utilizes binding agent M that concave mirror 2 and sealing 12 are fixed.
Below, " the place ahead " refers to the light exit direction, " rear " finger-hole direction.
Discharge lamp 1 comprises roughly spherical luminous tube portion 11 and continues at the columned sealing 12 at the two ends of luminous tube portion 11, and this discharge lamp 1 is made of light transmissive materials such as quartz glass.Discharge lamp 1 is the discharge lamp that exchanges lighting mode, is relatively set with the pair of electrodes 13,14 that is made of tungsten in the inner space of luminous tube portion 11.Engage the leading section of the metal forming 15 that power supply usefulness is arranged on the base end part of electrode 13,14, sealing 12 is by metal forming 15 airtight sealings.Engage the leading section that outside lead 16 is arranged on the base end part of metal forming 15, the base end part of outside lead 16 is outstanding to the foreign side of sealing 12.
In the inclosure of the inner space of luminous tube 11 mercury, halogen gas, inert gas are arranged.Inclosure has 0.2mg/mm
3The above mercury as luminescent substance is so that the mercury steam pressure of the inner space when lighting is more than 200 atmospheric pressure.About halogen gas, main for the inwall that prevents luminous tube portion 11 produces melanism because of halogen, thus enclose 10
-6μ mol/mm3～10
-2μ mol/mm3.About inert gas, for example start complementary and argon gas about inclosure 0.0133MPa in order to improve.
As shown in Figure 2, electrode 13 is made of the electrode leading section 131 and the electrode plug 132 in big footpath, above-mentioned electrode leading section 131 is relative with the electrode leading section 141 of opposite side electrode 14, the diameter of above-mentioned electrode plug 132 is less than electrode leading section 131, and continues on the base end part of electrode leading section 131.The starting assisted parts 131C of large diameter part 131B that electrode leading section 131 continues by jut 131A, with jut 131A and the coiled type that continues with large diameter part 131B constitutes.
Jut 131A is formed by the front end of electrode plug 132, equates with the external diameter of electrode plug 132, perhaps is slightly larger than or is slightly less than the external diameter of electrode plug 132 because of fusion.That is, jut 131A can't produce and grows because of lighting of extra-high-pressure mercury vapour lamp, and it is still formed by the front end of electrode plug 132.
Large diameter part 131B for example carries out fusion and forms bulk the part of the wire rod of the tungsten that twines with coiled type on electrode plug 132, can improve thermal capacity thus.
Starting assisted parts 131C when forming above-mentioned large diameter part 131B not the coiled type of fusion partly form.When the starting extra-high-pressure mercury vapour lamp, because starting assisted parts 131C has coil shape, so the gap between the spacing of coil easily becomes the starting point of discharge, and owing to be coiled type, therefore be easy to heating, thereby can be transformed into arc discharge rapidly from glow discharge.When lighting extra-high-pressure mercury vapour lamp,, therefore has the function of carrying out heat release stable by the concave-convex effect and the thermal capacity on surface because starting assisted parts 131C has coil shape.
An opposite side electrode 14 and a lateral electrode 13 are identically formed.Promptly, electrode leading section 141 and electrode plug 142 by big footpath constitute, above-mentioned electrode leading section 141 is relative with the electrode leading section 131 of a lateral electrode 13, and the diameter of above-mentioned electrode plug 142 is less than the base end part of electrode leading section 141, and continues on the base end part of electrode leading section 141.The starting assisted parts 141C of large diameter part 141B that electrode leading section 141 continues by jut 141A, with jut 141A and the coiled type that continues with large diameter part 141B constitutes.
The material that constitutes concave mirror 2 is not limited to glass materials such as quartz glass, also can use copper, brass, iron, aluminium, silver or their metal materials such as alloy.As the material that constitutes concave mirror, when use does not have the material of reflection characteristic as materials itself such as copper, brass, iron, the above-mentioned reflectance coating with character that visible light is reflected need be set on the inner surface of concave mirror 2.
On the other hand, as the material that constitutes speculum, when use itself has the material of reflection characteristic as materials such as aluminium or silver, need on the inner surface of concave mirror 2, not form the reflectance coating that visible light is reflected.But, this moment since concave mirror 2 except visible light is reflected, also infrared light is reflected, therefore need on the front glass 3 that is embedded on the light emission mouth 21 of concave mirror 2, apply the material that absorbs infrared light, or in the foreign side of concave mirror 2, in front glass 3 near be provided with the unit that absorbs infrared light.As other unit that are used to absorb infrared light, if adopt on the inner surface of concave mirror 2 for example coating to contain the unit of the low thermal expansion glass etc. of chromium, then can absorb infrared light, and cool off by outside to concave mirror, thereby can avoid the concave mirror temperature inside too to rise, therefore preferred this unit.
In the light supply apparatus 10 that the present invention relates to, the front-end edge of the place ahead elliptical mirror portion 22 is arranged on the position of stretching out greatly forward than the luminous tube portion 11 of discharge lamp 1.In the discharge lamp 1 that the present invention relates to, near jut 131A, 141A, form bright spot, therefore the center P2 between the electrode 13,14 of discharge lamp 1 is consistent with the 1st focus of the place ahead elliptical mirror portion 22 and rear elliptical mirror portion 26, and consistent with the center of spherical reflector portion 24.
And, the light supply apparatus that the present invention relates to is characterised in that, center P 2 between the electrode 13,14 is positioned at the front side of the front-end edge of the end edge of the place ahead elliptical mirror portion 22 or spherical reflector portion 24, i.e. the front side of the place ahead elliptical mirror portion 22 and the boundary portion P1 of spherical reflector portion 24.Below, the center P 2 between the electrode 13,14 can also abbreviate " interelectrode center P 2 " as, and the place ahead elliptical mirror portion 22 and the boundary portion P1 of spherical reflector portion 24 can also abbreviate " boundary portion P1 " as.
As shown in Figure 3, according to above-mentioned light supply apparatus, be directly incident on the position that light L1, L2 in the place ahead elliptical mirror portion 22 is concentrated on the 2nd focus of the place ahead elliptical mirror portion 22.Incide light L3 in the spherical reflector portion 24 after arc light returns, pass arc light elliptical mirror portion 22 reflections forwardly, thereby be concentrated on the position of the 2nd focus of the place ahead elliptical mirror portion 22.The light L4 that incides on the rear elliptical mirror 26 reflects in the elliptical mirror portion 26 in the wings, thereby is concentrated on the position of the 2nd focus.
Promptly, according to example shown in Figure 3, interelectrode center P 2 is positioned at the front side of boundary portion P1, thereby the light L2 that becomes direction problem, directive and optical axis Z quadrature in existing light supply apparatus shown in Figure 5 is directly incident on the place ahead elliptical mirror portion 22, above-mentioned thus smooth L2 can be not back and forth on any 2 straight lines that couple together in interelectrode center P 2 and the spherical reflector portion 24, therefore can make the illumination at focal point place be higher than the conventional lighting sources device.
Here, interelectrode center P 2 is positioned at the front side of boundary portion P1, thereby as mentioned above, can improve the illumination at focal point place, but when the front side of the too close boundary portion P1 of interelectrode center P 2, the illumination at focal point place may not improve.That is, in order to improve the illumination at focal point place, need be arranged on the optimum position according to the relation of itself and boundary portion P1 position with interelectrode center P 2.
Thereby, in light supply apparatus shown in Figure 1, preferably the position of discharge lamp 1 relative concave mirror 2 is defined as making angle X to satisfy the relation of 90 °＜X＜100 °, above-mentioned angle X is formed by following two straight lines: the imaginary line A of P1 of fillet portion and interelectrode center P 2 and be parallel to the straight line B that optical axis Z ground extends to the light emission direction from interelectrode center P 2.Preferably the position with discharge lamp 1 relative concave mirror 2 is defined as satisfying this angular range, confirms by following experiment.Below, the experiment of carrying out for the optimum positional relationship of determining boundary portion P1 and interelectrode center P 2 is described.
Below, by the imaginary line A of P1 of fillet portion and interelectrode center P 2 be parallel to the angle X that the straight line B that extends to the light emission direction on optical axis Z ground forms from interelectrode center P 2 and can also be called " angle X ".
Embodiment
According to structure shown in Figure 1, make 7 light supply apparatuses that embodiment relates to according to following specification.
(discharge lamp 1)
Total length 50mm, interelectrode distance 1mm, mercury enclosed volume 0.25mg/mm
3, rated power 200W
(concave mirror 2)
The place ahead elliptical mirror portion (22):
Ellipsoid with major axis 34.05mm, minor axis 19.29mm, the opening diameter of light emission mouth (21) is 37.2mm.The total length of optical axis direction is adjusted into 7 kinds in the scope of 15.72～20.57mm.
Spherical reflector portion (24):
Has the sphere that radius is 8～12mm.The total length of optical axis direction is adjusted into 7 kinds in the scope of 2.33～4.33mm.
Rear elliptical mirror portion (26):
Ellipsoid with major axis 35.05mm, minor axis 22.29mm, the opening diameter of hole (29) is 10mm.The total length of optical axis direction is adjusted into 7 kinds in the scope of 1.2～3.96mm.
Utilize 7 kinds of different concave mirrors of total length of above-mentioned discharge lamp and optical axis direction, make interelectrode center P 2 and concern 7 kinds of different light supply apparatuses with the position of boundary portion P1.With these 7 kinds of light supply apparatuses is embodiment 1～7.In the light supply apparatus of embodiment 1～7, interelectrode center P 2 shown in Figure 1 from boundary portion P1 to optical axis direction the place ahead separate apart from T (abbreviating separating distance T as), have nothing in common with each other with the relation of angle X, particularly as shown in table 1 below.
Comparative example
According to structure shown in Figure 4, make 1 light supply apparatus that comparative example relates to according to following specification.
(discharge lamp 1)
Identical with embodiment.
(concave mirror 2)
The place ahead elliptical mirror portion (22):
Ellipsoid with major axis 34.05mm, minor axis 19.29mm, the opening diameter of light emission mouth (21) is 37.2mm.The total length of optical axis direction is 18.4mm.
Spherical reflector portion (24):
Has the sphere that radius is 11.4mm.The total length of optical axis direction is 4.16mm.
Rear elliptical mirror portion (26):
Ellipsoid with major axis 35.05mm, minor axis 22.29mm, the opening diameter of hole (29) is 10mm.The total length of optical axis direction is 3.36mm.
The relation of separating distance T and angle X is as shown in table 1 below.
Light the discharge lamp of the light supply apparatus of the foregoing description 1～7 and comparative example, light shine on the screen of vertical 5.0 * laterally 3.8mm, measure the illumination on the screen.Its result of table 1 expression.
In table 1, the brightness value that the light supply apparatus that embodiment 1～7 relates to obtains is expressed as the relative value that brightness value that light supply apparatus that comparative example is related to obtains was made as at 1 o'clock.In addition, in table 1, when separating distance T be on the occasion of the time, represent the state that interelectrode center P 2 is separated to optical axis Z direction the place ahead from boundary portion P1, when separating distance T is negative value, represent the state that interelectrode center P 2 is separated to optical axis Z direction rear from boundary portion P1.
Table 1
| Separating distance T (mm) | Angle X (°) | Illumination | |
| Embodiment 1 | 2.36 | 105.2 | 0.988 |
| |
1.75 | 100.0 | 0.995 |
| Embodiment 3 | 1.14 | 96.5 | 1.014 |
| Embodiment 4 | 0.90 | 95.1 | 1.022 |
| Embodiment 5 | 0.66 | 93.6 | 1.033 |
| Embodiment 6 | 0.42 | 92.3 | 1.048 |
| Embodiment 7 | 0.17 | 90.9 | 1.01 |
| Comparative example | -0.55 | 87.2 | 1 |
Judge the following fact from the experimental result shown in the table 1.
The light supply apparatus that relates to as embodiment 3 to 7, the position of the relative concave mirror of discharge lamp is defined as, when the interelectrode center P 2 of discharge lamp is positioned at scope in 90 °＜X＜100 ° of the place ahead of imaginary plane of the boundary portion P1 that comprises concave mirror and angle X, with the light supply apparatus that relates to as comparative example, the position of the relative concave mirror of discharge lamp is defined as, the interelectrode center P 2 of discharge lamp is positioned at when the rear of imaginary plane of the boundary portion P1 that comprises concave mirror and angle X are 87.2 ° to be compared, and the illumination on the screen has improved 1～4.8%.
Particularly judge the light supply apparatus that embodiment 4 to 6 that above-mentioned angle X satisfies the scope of 92.3 °≤X≤95.1 ° relates to, compare with the light supply apparatus that comparative example relates to, illumination on the screen improves 2.2～4.8%, and the illumination on the screen is higher than the light supply apparatus that other embodiment relate to.
In addition, shown in embodiment 1,2, above-mentioned angle X is more than 100 ° the time, and the illumination on the screen is lower than the light supply apparatus that comparative example relates to, judge thus in interelectrode center P 2 and too in the light supply apparatus near the place ahead of boundary portion P1, can't improve the illumination on the screen.
According to the light supply apparatus that embodiment 4 to 6 relates to, as mentioned above, to compare with the light supply apparatus that comparative example relates to, the illumination on the screen improves 2.2～4.8%.Generally speaking in the projection arrangement that the light supply apparatus that the present invention relates to is installed,, will bring very big favourable influence, so illumination improves 2.2～4.8%, very large effect to the picture quality of projection on the screen if the illumination at focal point place improves 1%.
And, if illumination will be improved more than 2%, must adopt the mercury enclosed volume that increases in the discharge lamp usually, and increase methods such as input electric power, but when adopting this method, cause that thereupon the possibility of new problem is bigger discharge lamp.Yet, light supply apparatus of the present invention has to need not to increase to be lighted electric power and also illumination can be risen to the advantage that is higher than the conventional lighting sources device, and can reduce to obtain the illumination identical with the conventional lighting sources device required light electric power, therefore help reducing carrying capacity of environment.
Light supply apparatus of the present invention is not limited to above-mentioned embodiment, can implement various changes.
Also can use following concave mirror: only constitute, have the reflecting surface that the curved surface of 2 different curvature continues by the place ahead elliptical mirror portion with the spherical reflector portion of the backhaul of the place ahead elliptical mirror portion.Certainly, also can use the concave mirror of the reflecting surface that curved surface with 4 above different curvature continues.
In addition, also can make light in the place ahead of concave mirror elliptical mirror portion and the reflection of rear elliptical mirror portion, radiate from the light emission mouth along optical axis Z, also can only make the either party of elliptical mirror portion forwardly or rear elliptical mirror portion go up the light of reflection, radiate from the light emission mouth along optical axis Z.
In addition, during the bigger discharge lamp 1 of the thickness of the luminous tube portion 11 in the light supply apparatus 10 that use the present invention relates to, consider following situation: reflect because of the lens effect of luminous tube portion 11 when passing luminous tube portion 11 to the light of arc light reflection from the light of the arc light radiation that between electrode 13,14, forms or by spherical reflector portion 24.At this moment, can reduce slightly though be concentrated on the light of the 2nd focus of the place ahead elliptical mirror portion 22 and rear elliptical mirror portion 26, the following speculum of therefore preferred use: though have is not the reflecting surface that strict ellipse of revolution face is approximately the ellipse of revolution face.
Thereby the place ahead elliptical mirror portion 22 among the present invention is not limited to the speculum that reflector shape is the ellipse of revolution face, is the speculum that non-ellipse of revolution face is approximately the ellipse of revolution face on stricti jurise though also comprise reflector shape.
Identical with above-mentioned reason, spherical reflector portion 24 is not limited to the speculum that mirror shapes is a sphere, is the speculum that aspheric surface is approximately sphere on stricti jurise though also comprise reflector shape.
Claims (4)
1. light supply apparatus comprises: discharge lamp, and pair of electrodes is oppositely arranged in discharge vessel; And concave mirror, have the place ahead elliptical mirror portion of being provided with the light emission mouth and with the spherical reflector portion of the backhaul of the place ahead elliptical mirror portion, above-mentioned light supply apparatus is characterised in that:
The above-mentioned relatively concave mirror of above-mentioned discharge lamp is arranged to, and it is interelectrode to be centered close to the front side of the imaginary plane of the boundary portion that comprises above-mentioned the place ahead elliptical mirror portion and above-mentioned spherical reflector portion.
2. light supply apparatus according to claim 1 is characterized in that:
Above-mentioned light supply apparatus, on the cross section of blocking with the plane that comprises its optical axis, satisfy the relation of 90 °＜X＜100 °, above-mentioned angle X is formed by following two straight lines: the straight line of drawing to the boundary portion of above-mentioned the place ahead elliptical mirror portion and above-mentioned spherical reflector portion from above-mentioned interelectrode center and be parallel to the straight line of optical axis ground to the extension of light emission direction from above-mentioned interelectrode center.
3. according to claim 1 or the described light supply apparatus of claim 2, it is characterized in that:
Above-mentioned concave mirror has the rear elliptical mirror portion with the backhaul of above-mentioned spherical reflector portion.
4. concave mirror, have: elliptical mirror portion in the place ahead is provided with the light emission mouth; Spherical reflector portion is with the backhaul of the place ahead elliptical mirror portion; And rear elliptical mirror portion, with the backhaul of spherical reflector portion, above-mentioned concave mirror is characterised in that:
The 1st focus of the 1st focus of above-mentioned the place ahead elliptical mirror portion and above-mentioned rear elliptical mirror portion is positioned at the place ahead of the imaginary plane of the boundary portion that comprises above-mentioned the place ahead elliptical mirror portion and above-mentioned spherical reflector portion.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006150158 | 2006-05-30 | ||
| JP2006150158 | 2006-05-30 | ||
| JP2006205569 | 2006-07-28 |
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| Publication Number | Publication Date |
|---|---|
| CN101082403A true CN101082403A (en) | 2007-12-05 |
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|---|---|---|---|
| CN 200710105095 Pending CN101082403A (en) | 2006-05-30 | 2007-05-22 | Light source device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101545609B (en) * | 2008-03-25 | 2010-09-29 | 山西光宇电源有限公司 | Multi-surface reflector for LED street lamp |
| CN105822949A (en) * | 2015-01-09 | 2016-08-03 | 哈尔滨新光光电科技有限公司 | Uniform illumination system based on two reflecting covers |
| CN107448865A (en) * | 2017-07-14 | 2017-12-08 | 达运精密工业股份有限公司 | Light reflector and lighting device with same |
-
2007
- 2007-05-22 CN CN 200710105095 patent/CN101082403A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101545609B (en) * | 2008-03-25 | 2010-09-29 | 山西光宇电源有限公司 | Multi-surface reflector for LED street lamp |
| CN105822949A (en) * | 2015-01-09 | 2016-08-03 | 哈尔滨新光光电科技有限公司 | Uniform illumination system based on two reflecting covers |
| CN107448865A (en) * | 2017-07-14 | 2017-12-08 | 达运精密工业股份有限公司 | Light reflector and lighting device with same |
| CN107448865B (en) * | 2017-07-14 | 2022-06-28 | 达运精密工业股份有限公司 | Light reflector and lighting device with same |
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Application publication date: 20071205 |