JP4612638B2 - Light source device and video display device using the same - Google Patents

Description

  The present invention relates to a light source device having a reflector for reflecting outgoing light emitted from an arc tube, and an image display device using the same.

  FIG. 12 is a diagram illustrating an example of the configuration of the projection display apparatus. As the arc tube 20, a halogen lamp having a filament-type electrode structure, a metal halide lamp having an electrode structure for generating arc discharge, a xenon short arc lamp, or a high-pressure mercury lamp is used. The light emitted from the arc tube 20 is configured to irradiate in a desired direction and region using a reflecting mirror 21 (hereinafter referred to as a reflector) mainly composed of an elliptical surface or a hyperboloid surface made of a glass substrate. Yes. The light source device 19 includes the arc tube 20 and the reflector 21. For convenience, the light source device 19 is upstream of the optical path and the screen 28 is downstream of the optical path, and will be described below.

  A projection-type image display device using such a light source device includes, for example, a so-called Digital Light Projector (hereinafter referred to as DLP) as shown in FIG. 12, and a movable mirror of a micron order called Digital Mirror Device (hereinafter referred to as DMD). Elements that form an image by controlling the array 26 are used.

  In this DLP method, a color wheel (hereinafter referred to as CW) 22 is disposed in the vicinity of the focal point of the emitted light from the light source device 19. A rod integrator (hereinafter referred to as a rod) 23 is disposed downstream or upstream of the CW 22. The rod 23 is mainly made of a glass substrate, and a light beam incident on the rod 23 at a desired spread angle repeats total reflection at the inner surface of the rod 23 glass material due to a difference in refractive index between the rod 23 glass material and air. 23 It propagates efficiently inside the glass material.

  Then, the light beam from the exit portion of the rod 23 becomes a multiple reflection image of the light source while maintaining a desired spread angle, and the light source image is mixed, so that the illuminance on the exit surface of the rod 23 is made uniform. A DMD 26 is disposed downstream of the optical path of the rod 23 via a condenser lens 24, a mirror 25, and the like.

  Here, the CW 22 is divided into three or more segments formed with dichroic mirrors (hereinafter DM) that transmit at least red (hereinafter R), green (hereinafter G) and blue (hereinafter B) rays. The rotation is controlled. The phase rotation of the CW 22 is controlled by the synchronization signal of the DMD 26, and the light beam emitted from the arc tube 20 passes through the R segment of the CW 22 during the time period when the R image data is input to the DMD 26.

  The light emitted from the arc tube 20 passes through the CW 22 and becomes R, G, B light in time order, and the DMD 26 also forms the R, G, B screen in time order in synchronization therewith. The R, G, and B light beams enter and exit the DMD 26, and R, G, and B images (light beams) are formed sequentially in time.

  A projection lens 27 is disposed downstream of the optical path of the DMD 26, and R, G, and B images are projected on the screen 28 in time order by the projection lens 27. At this time, since the R, G, and B images projected on the screen 28 are each switched at a speed equal to or higher than the human color resolution of 180 Hz or more, they are visually recognized as color images.

  Next, the background art of the light source device will be described with reference to FIGS. 7A and 7B are diagrams showing the structure of a conventional light source device, where FIG. 7A is a side view and FIG. 7B is a plan sectional view. FIG. 8 is a plan sectional view for explaining the behavior of light rays in a conventional light source device.

  In light source devices conventionally used for projection display devices and the like that require a light source with high brightness, as described above, metal halide lamps, xenon short arc lamps, and high-pressure mercury shown in FIG. An arc tube 4 that performs illumination by generating arc discharge, such as a lamp, is used.

  Here, in FIG. 7, the arc tube 4 has a light emitting part 5 as a center, and a cathode electrode sealing part 6 and an anode electrode sealing part 7 on both sides thereof. The reflecting surface 16 of the reflector 15 is an ellipsoid, and by positioning the bright spot inside the light emitting portion 5 of the arc tube 4 near the first focal point of the ellipse, the light beam from the bright spot is As shown in FIG. 8, the light is reflected by the reflecting surface 16 and condensed at a desired point Sp which is the second focal point of the ellipse. Here, as the shape of the reflecting surface 16, there are an ellipse, a spherical surface, a hyperboloid, and the like, which are selected in conjunction with the design of the subsequent optical system.

  The reflector 15 and the arc tube 4 are aligned by fixing the reflector 15 to a dedicated angle base, and the arc tube 4 is fixed to a system in which an XY or XYZ stage and a chuck mechanism are integrated, and inserted into the reflector 15. Placed. An aperture (aperture) jig having a desired size is provided at the second focal point of the ellipse of the reflector 15.

  After the reflector 15 and the arc tube 4 are aligned, the arc tube 4 is turned on, the position of the arc tube 4 is adjusted by an XY stage, and the light beam passing through the aperture is adjusted and positioned.

  Next, the arc tube 4 is turned off, and the fixing material 18 is filled in the gap between the arc tube holding portion 17 (hereinafter referred to as a hole portion) of the reflector 15 and the anode electrode sealing portion 7 of the arc tube 4. As the fixing material 18, a material that can be cured at the maximum strength by baking at approximately 100 degrees or more for 30 minutes is used.

  As a material of the conventional reflector 15, heat resistant glass is used, and the hole portion 17 is filled from the outside of the reflector 15. Here, since the conventional reflector 15 is a glass substrate, the filling amount of the fixing material 18 can be visually observed from the outside as shown in FIG. Filling can be done quickly and accurately.

  The prior art will be described below as a proposal for improving the method of fixing the reflector made of the glass substrate and the arc tube.

  Patent Document 1 describes an illumination device in which a hole is tapered. 9 and 10 are diagrams showing the structure of such a prior art lighting device. In the case of FIG. 9, it is preferable to fill the fixing material 18 from the light emitting part side (right side of the drawing) of the arc tube of the hole 17, and even if the fixing amount is large, the optical performance is deteriorated only by protruding to the outside of the reflector 15. There is no. In the case of FIG. 11, the filling of the fixing material 18 is preferably from the outer end portion (left side in the figure) of the electrode sealing portion 7 of the arc tube 4, and the smaller the diameter as the hole portion 17 is directed to the reflecting surface 16 side. Therefore, the fixing material is difficult to flow into the light emitting portion 5 of the arc tube 4.

  Japanese Patent Application Laid-Open No. 2004-228561 describes a thing related to a sticking amount management in which a partition plate with a hole is provided at a sealing part on the sticking side of the arc tube to prevent sticking material from sticking out.

  In recent years, the demand for small projectors for mobile use has increased, and it is desired to reduce the size of light source devices. In this case, as shown in FIG. 9, the distance between the reflecting surface 16 of the reflector 15 and the light emitting portion 5 of the arc tube 4 is shortened, and the conventional glass substrate reflector 15 has poor thermal conductivity. Since heat concentration occurs on the nearest reflecting surface 16, there is a problem that the reflecting film is destroyed.

  For this reason, there is a proposal to use a metal reflector mainly composed of an aluminum (alloy) substrate. Since the thermal conductivity of aluminum base is two orders of magnitude better than glass base, when it is used in a reflector, heat is conducted to the entire reflector, so it is possible to eliminate heat concentration in a part of the reflector. , Leading to improved life without destroying the reflective film.

  In addition, in terms of safety, in the case of the conventional glass substrate reflector 15, in the unlikely event that the arc tube 4 explodes, the glass substrate reflector itself may also be destroyed, and it is sealed in a glass piece or arc tube. There was a risk that mercury, such as mercury, that had been harmful to the human body was scattered around. In a metal reflector, even if the arc tube explodes, glass fragments and mercury of the arc tube do not scatter around and it is easy to make a sealed structure.

Here, the prior art will be described below as a proposal of a light source device using a metal reflector.
In Patent Document 3 and Patent Document 4, it is proposed to perform optimum lighting temperature control and life improvement of the arc tube by conducting the temperature of the arc tube to a metal reflector.
Further, Patent Document 5 proposes an ultra-compact high-intensity light source device that can efficiently control the temperature of the arc tube with a metal reflector and can have a sealed structure.

Noto 3004793 Japanese Patent Application Laid-Open No. 2005-266643 JP 2005-149968 A JP 2006-179450 A JP 2005-234471 A

  However, when the reflector is small, the hole portion 17 (indicated by a dotted line in the figure) cannot be seen from the arc tube 4 side as shown in FIG. 10, so that it is difficult to fill the fixing material from the arc tube side. There is a problem.

  Further, when the reflector 15 of FIG. 9 is made of a metal substrate, the reflector 15 becomes opaque, and therefore the filling amount of the fixing material 18 in the hole portion cannot be visually confirmed from the outside of the reflector 15. There are many cases in which the fixing material flows in, and there is a problem that the optical performance is remarkably deteriorated or the life is remarkably reduced.

  As a factor for deteriorating the optical performance, the amount of light is reduced when adhering to the light emitting portion of the arc tube 4 because the transmittance of the fixing material 18 is poor. At this time, the temperature of the light-emitting portion 5 of the arc tube 4 is locally reduced, and the halogen cycle inside the light-emitting portion becomes unstable, resulting in a decrease in luminous efficiency. In other words, the absorption of light causes heat concentration to reduce the life of the arc tube.

  Further, in the reflector 15 made of a metal substrate, the inner diameter dimension of the hole portion 17 of the reflector 15 changes in a direction in which it expands due to thermal expansion during lighting of the arc tube 4. Since the thermal expansion of the fixing material 18 and the arc tube 4 (quartz) is smaller than that of metal, the fixing portion between the inner diameter of the hole 17 and the fixing material 18 is peeled off, and the arc tube 4 is repeatedly turned on and off several times. In the meantime, the arc tube 4 and the reflector base material 15 are displaced and rotated, and the bright spot portion of the light emitting portion 5 deviates from the first focus of the reflecting surface 2 of the reflector 15 and the brightness is dramatically reduced. There is a problem.

  Accordingly, the present invention provides a light source device and a light source device capable of reliably fixing the opaque base reflector and the arc tube and controlling the amount of fixing without causing a decrease in light capturing efficiency, while having a simple and compact configuration. The purpose is to provide a video display device used.

  The configuration of the present invention for achieving the above object is as follows.

An arc tube having a light emitting part and an electrode sealing part, and a reflector having an arc tube holding part for reflecting the emitted light from the arc tube and holding the arc tube, the reflector being made of an opaque base material. In the light source device, the reflector is fixed to the electrode sealing part of the arc tube by filling the arc tube holding part of the reflector with a fixing material. A through hole is provided.
There may be a plurality of slits or through holes.
The video display device of the present invention is a video display device using such a light source device.

  According to the present invention, there is provided a light source device capable of reliably fixing an opaque base material reflector and an arc tube and controlling the amount of fixing without causing a reduction in light capturing efficiency while having a simple and compact configuration. A video display device using the above is realized.

  Embodiments of the present invention will be described below with reference to FIGS. First, a light source device according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 3.

  1A and 1B are diagrams showing a basic configuration of a light source device according to a first embodiment of the present invention, where FIG. 1A is a side view and FIG. 1B is a cross-sectional view. The base material of the reflector 1 is made of an aluminum alloy as a main component and is manufactured by die casting (die casting). The basic configuration of the reflector 1 is composed of an elliptical reflecting surface 2 that condenses the light emitted from the arc tube 4 in a desired region, and a hole portion 3 that holds the arc tube 4. The reflective surface 2 defines the surface accuracy by surface roughness, and after cutting or polishing as necessary, a heat-resistant base coat material is applied to deposit a dielectric multilayer film that reflects visible light.

  For the base coat material, the coating amount is adjusted as necessary depending on the surface roughness of the reflecting surface 2. In addition to the above, the reflective film may be a total reflection film of aluminum or silver or an increased reflection film. Here, the reflector made of an aluminum base material may be subjected to a rust prevention treatment. For example, by applying chromate alumite, infrared rays emitted from the arc tube can be converted into heat to dissipate heat.

  The arc tube 4 has the same configuration as the arc tube 4 of FIG. The configuration will be described in detail.

  The arc tube 4 includes a light emitting section 5 (sealed body) which is a DC lighting type high pressure mercury arc tube having a diameter of about 10 (mm), a pair of main electrodes, an anode electrode, and a cathode electrode. The electrode sealing portion 6 on the cathode electrode side to be sealed and the electrode sealing portion 7 on the anode electrode side are configured. In general, the electrode sealing part 7 side on the anode electrode side is fixed to the hole part 3 of the reflector 1. This is because an electron flow is generated from the cathode electrode to the anode electrode, so that the anode electrode is at a high temperature and requires further cooling from the viewpoint of life. The input power of the arc tube 4 is, for example, about 150 (W) to about 200 (W).

  A total of six slits 8 a are provided on the light emitting part 5 side (near) of the arc tube 4 in the hole part 3 of the metal base reflector 1. In the first embodiment, the slit 8a is integrally formed during die casting.

  FIG. 3 is a diagram showing a basic configuration of a light source device according to a second embodiment of the present invention, where (a) is a side view and (b) is a cross-sectional view. 1 is substantially the same as that of the first embodiment shown in FIG. 1, but instead of the slits 8a, a total of six penetrations are made on the light emitting part 5 side (near) of the arc part 4 of the hole part 3 of the metal base reflector 1. A square hole 8b is provided. In the second embodiment, the through-square hole 8b is formed by secondary processing, but can be integrally formed at the time of die casting.

  Here, regarding the alignment of the arc tube 4 and the reflector 1, as described above in the prior art, the arc tube 4 is fixed to an XYZ stage integrated chuck jig, and the arc tube 4 is chucked by the XYZ stage. Is inserted into the hole 3 of the reflector 1, the arc tube 4 is turned on, and alignment (optical axis alignment) is performed.

  After the alignment of the reflector 1 and the arc tube 4 is completed, the arc tube 4 is turned off, and the fixing material 9 is filled in the hole 3 of the reflector 1 as shown in FIGS. 2 and 4 are views showing a state in which the fixing agent is filled in the light source device shown in FIGS. 1 and 3, respectively. FIG. 2A is a side view, and FIG. The fixing material 9 is filled from the end (left side in FIGS. 2 and 4) direction of the anode side electrode sealing portion.

  The fixing material 9 is a syringe, and a rubber material having an opening Φ1 to 2 mm is attached to the injection portion of the syringe. When the filling amount is increased, the filling state can be visually confirmed from the square hole 8b provided in the hole portion 3 of the reflector 1. When the filling amount is further increased, the back side of the square hole 8b is filled with the fixing material 9 as shown in FIG. The time when the fixing material 9 is filled is designed as a specified value of the fixing amount.

  When the number of square holes 8b provided in the hole 3 of the reflector 1 is increased and the assemblability (accuracy and time) is evaluated, the number of fixings can be reduced for a short time even for non-experienced persons by using four or more. The result that it was possible to fill up to the specified value was obtained.

  Here, in the case where importance is attached to the sealing performance, auxiliary filling of the fixing material 9 from the outside of the slit 8a or the square hole 8b of the hole portion 3 of the reflector 1 or a component that separately covers the slit 8a or the square hole 8b is performed. It may be provided.

  Moreover, when performing forced air cooling efficiently regardless of hermeticity, the slit 8a or the square hole 8b is not blocked by the fixing material 9, and is completed by filling about half as shown in FIGS. The design may be such that the wind flows through 8a or the square hole 8b.

  FIG. 6 is a diagram showing a basic configuration of a light source device according to the third embodiment of the present invention, in which (a) is a side view and (b) is a cross-sectional view. FIG. 6 shows an embodiment of a light source device of the type in which the arc tube 4 is arranged substantially perpendicular to the optical axis LA.

  First, an optical description will be given when the arc tube 4 is disposed laterally with respect to the optical axis LA. The behavior of the light beam emitted from the light emitting portion 5 of the arc tube 4 is roughly divided into two types. The first is a group of light beams that are reflected by the elliptical reflecting surface 2s1 of the reflector 1s and collected in a desired region Sp. The second is a group of rays that do not irradiate the elliptical reflecting surface 2s1, enter the condenser lens 10, and condense on the desired area Sp. A light ray group traveling behind the arc tube 4 (opposite to the optical axis LA) is reflected by the spherical reflecting surface 2s2, re-enters the light emitting portion 5 of the arc tube 4, and then reflected by the elliptical reflecting surface 2s1. Then, the light beam is condensed into the desired region Sp, and the light beam is not irradiated onto the elliptical reflecting surface 2s1, but is incident on the condensing lens 10 and condensed into the desired region Sp.

  Since the arc tube 4 is arranged perpendicularly to the optical axis LA, there is no obstacle such as an electrode sealing portion of the arc tube 4 in the optical axis direction LA from the arc tube, so that the focal length can be shortened, so that the size is small. It is a light source device that can be expected. An aluminum alloy substrate is also used for the reflector of the third embodiment.

  Next, the assembly of the light source device of FIG. 6 will be described. First, the reflector 1s is fixed to an assembly table, and the arc tube 4 is held by an XYZ stage with an integrated chuck mechanism. When the arc tube 4 is chucked, the arc tube 4 is inserted from the hole 3S1 or the hole 3S2 of the reflector 1s, and when the center of the light emitter 5 of the arc tube 4 is positioned on the optical axis, the arc tube Stop inserting 4. An opening of a desired region Sp is formed on the assembly base, that is, an aperture jig is provided in advance, the arc tube 4 is turned on, alignment is performed, and the luminous flux passing through the aperture jig is maximized. Then, the alignment of the arc tube 4 is finished and the arc tube 4 is turned off.

  As for the fixing of the reflector 1s and the arc tube 4, as in the conventional light source device, the electrode sealing portion on the anode electrode side of the arc tube 4 and the hole 3s1 of the reflector are filled with a fixing material. Here, when the light source device of FIG. 8 has a sealed structure, the electrode sealing portion on the anode electrode side of the arc tube 4 and the hole portion 3s1 of the reflector are filled with the fixing material, and the electrode of the cathode electrode The sealing part and the hole part 3s2 of the reflector may be filled with a fixing material, or may be sealed with a cap material separately.

  When filling the hole 3s1, 3s2 of the reflector 1s with the fixing material, if the through hole 8s for visually confirming the filling amount is not provided, even if it is an experienced person, the non-defective rate is less than 80%, and the filling time is also It was 1.5 times or more than before. The main cause of the filling failure was that the fixing material flowed into the spherical reflecting surface 2s2, and then the arc tube detachment due to insufficient filling amount. Regarding the ellipsoidal surface 2s1 side, the inside of the reflector 1s can be observed from the direction of the optical axis LA, and the filling state can be visually observed. On the spherical reflecting surface 2s2 side, the inside of the reflector 1s can be observed from the direction of the optical axis LA. However, since there is the arc tube 4, visual observation is impossible, and the yield rate is low.

  Therefore, when the filling amount visual observation hole 8s was formed in each of the arc tube holding portions 3s1, 3s2, and filling was performed, the yield rate was 95% or more, and the filling time was equivalent to the conventional one.

  Also in the third embodiment, it may be formed by a die-cast mold or by additional machining.

  Further, when the diameter of the light emitting portion 5 (sealing body) of the arc tube 4 is larger than the diameter of each of the hole portions 3s1 and 3s2 of the reflector 1s, the reflector 1s is divided into an upper and lower structure and is spherical with the elliptical reflecting surface side. A split structure may be used on the reflecting surface side. The divided reflector 1s can be easily connected with a screw or the like because the reflector is an aluminum base material.

  The present invention is applicable to a light source device and a video display device using the same.

It is a figure which shows the basic composition of the light source device which concerns on the 1st Embodiment of this invention, (a) is a side view, (b) is sectional drawing. It is a figure which shows a mode that the fixing agent was filled in the light source device shown in FIG. 1, (a) is a side view, (b) is sectional drawing. It is a figure which shows the basic composition of the light source device which concerns on the 2nd Embodiment of this invention, (a) is a side view, (b) is sectional drawing. It is a figure which shows a mode that the fixing agent was filled in the light source device shown in FIG. 3, (a) is a side view, (b) is sectional drawing. It is a figure which shows a mode that filling of the fixing agent was completed in the light source device shown in FIG. 3, (a) is a side view, (b) is sectional drawing. It is a figure which shows the basic composition of the light source device which concerns on the 3rd Embodiment of this invention, (a) is a side view, (b) is sectional drawing. It is a figure which shows the structure of the conventional light source device, (a) is a side view, (b) is a plane sectional view. It is a plane sectional view explaining the behavior of the light beam in the conventional light source device. It is a figure which shows the structure of the illuminating device of a prior art. It is a figure which shows the structure of the illuminating device of a prior art. It is a figure which shows the structure of the illuminating device of a prior art. It is a figure which shows an example of a structure of a projection type video display apparatus.

Explanation of symbols

1, 1 s, 15, 21 Reflector 2, 16 Reflecting surface 2 s 1 Elliptical reflecting surface 2 s 2 Spherical reflecting surface 3, 3 s 1, 3 s 2, 17 Hole portion 4, 20 Arc tube 5 Light emitting portion 6 Electrode sealing portion 7 on the cathode electrode side Anode electrode Side electrode sealing part 8a Slit 8b Through-square hole 8s Through-hole 9, 18 Fixing agent 10 Condensing lens 19 Light source device 22 CW
23 Rod 24 Condenser lens 25 Mirror 26 DMD
27 Projection lens 28 Screen

Claims (5)

An arc tube having a light emitting portion and an electrode sealing portion;
A reflector having an arc tube holding portion for reflecting the emitted light from the arc tube and holding the arc tube;
The reflector comprises an opaque substrate;
The reflector is fixed to the electrode sealing portion of the arc tube by filling the arc tube holding portion of the reflector with a fixing agent,
A slit is provided on the light emitting part side of the arc tube holding part of the reflector ,
At least a part of the slit is blocked with the fixing agent .   2. The light source device according to claim 1, wherein there are a plurality of slits provided on the light emitting part side of the arc tube holding part of the reflector. An arc tube having a light emitting portion and an electrode sealing portion;
A reflector having an arc tube holding portion for reflecting the emitted light from the arc tube and holding the arc tube;
The reflector comprises an opaque substrate;
The reflector is fixed to the electrode sealing portion of the arc tube by filling the arc tube holding portion of the reflector with a fixing material,
A through hole is provided on the light emitting part side of the arc tube holding part of the reflector ,
At least a part of the through hole is closed with the fixing agent .   4. The light source device according to claim 3, wherein there are a plurality of through holes provided on the light emitting part side of the arc tube holding part of the reflector.   The video display apparatus using the light source device of any one of Claim 1 to 4.

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