JP4478063B2 - Ultra high pressure discharge lamp unit - Google Patents

Description

  The present invention relates to an ultra high pressure discharge lamp unit that is applied to a projection type projector that projects information displayed on a video device by a projection optical system.

  In recent years, projection projectors have been used in various scenes such as business presentations, home theaters in the home, or rear projection televisions. The light source device, which is the main component, has a discharge lamp on a reflector having a concave reflecting surface. An attached discharge lamp unit is generally used. Such a discharge lamp unit has a strong demand for “brightness improvement”, and conventionally, this demand has been met by increasing the pressure of the discharge lamp and reducing the size of the discharge lamp.

  However, when the pressure of the discharge lamp is increased, the frequency of rupture increases, so it is necessary to prevent the discharge lamp fragments and mercury from being scattered at the time of the rupture, and the discharge lamp temperature rises above the appropriate temperature. In this case, since the life of the discharge lamp is shortened, it is necessary to suppress the temperature rise of the discharge lamp.

Therefore, in the prior art described in Patent Document 1, (a) by attaching a cover to the opening of the reflector, it is possible to prevent fragments of the discharge lamp and mercury from scattering from the opening, and (b) to the reflector. By providing a notch for ventilation, the temperature rise of the discharge lamp is suppressed, and (c) by covering the notch with a mesh member, fragments of the discharge lamp and mercury are scattered from the notch. Was preventing.
JP-A-10-2223023

  According to the prior art (Patent Document 1), it is possible to prevent the fragments and mercury from being scattered when the discharge lamp is ruptured while extending the life of the discharge lamp. However, the conventional technology assumes that the pressure in the discharge lamp is medium pressure (20 to 150 atmospheres) (see [0003]), and the pressure in the discharge lamp is high (170 atmospheres or more). Could not fully exert its effect.

  That is, when the pressure in the discharge lamp becomes high (170 atm or higher), the amount of mercury enclosed in the discharge lamp becomes so large that it cannot be compared with the case of medium pressure (20 to 150 atm) (for example, 170 atm). The amount of mercury in the discharge lamp is 1.7 times the amount of mercury in the 100 atm discharge lamp.) Also, as shown in [Table 1], the fragments of the discharge lamp at the time of bursting are extremely small. Therefore, in order to reliably prevent discharge lamp fragments and mercury scattering, it is necessary to make the opening of the mesh member (mesh) extremely small. However, if this is done, the air permeability of the mesh member is impaired and the temperature of the discharge lamp is reduced. As a result, the rise could not be sufficiently suppressed, and as a result, the life of the discharge lamp was shortened.

  Therefore, a main problem to be solved by the present invention is to provide an ultra-high pressure discharge lamp unit that can suppress an increase in the temperature of the discharge lamp and can reliably prevent debris and mercury from being scattered when the discharge lamp bursts.

  According to the first aspect of the present invention, “a reflector 14 having a concave reflecting surface 14 a, an ultra-high pressure discharge lamp 12 attached to the center of the reflector 14, and a transparent attached to the front opening of the reflector 14. In the ultra-high pressure discharge lamp unit 10 including the light cover 16, the side wall of the reflector 14 is provided with a vent 36 that communicates the inner space and the outer space. In addition, vent plates 38 and 54 made of a metal that has a plurality of vent holes 40 and reacts with mercury to generate amalgam are disposed, and an inner opening 40a facing the inner space of the vent hole 40 is formed. The ultrahigh pressure discharge lamp unit 10 "is smaller than the outer opening 40b facing the outer space.

  In order to reliably prevent debris and mercury of the ultra high pressure discharge lamp 12 from being scattered, it is necessary to make the inner openings 40a of the respective vent holes 40 small, and a sufficient amount is provided in the inner space of the reflector 14 through the vent holes 40. In order to take in the air, it is necessary to enlarge the outer opening 40b which becomes the “air intake port” of each vent hole 40. According to the present invention, since the inner opening 40a of the vent hole 40 is formed smaller than the outer opening 40b, both of these requirements can be satisfied. In the present invention, since the ventilation plates 38 and 54 are made of a metal (aluminum, gold, silver, zinc, cadmium, lead, sodium, potassium, etc.) that reacts with mercury to form amalgam, Mercury scattered when the electric lamp 12 is ruptured can be reacted with the ventilation plates 38 and 54 to be fixed as “amalgam”.

  The invention described in claim 2 is: “a reflector 14 having a concave reflecting surface 14 a, an ultra-high pressure discharge lamp 12 attached to a central portion of the reflector 14, a case 44 for housing the reflector 14, and the case In the ultra-high pressure discharge lamp units 48 and 52, each having a translucent cover 50 attached to the front opening of 44, the side wall of the case 44 has a vent hole 46 communicating the inner space and the outer space. Ventilation plates 38 and 54 made of metal that has a plurality of vent holes 40 and reacts with mercury to generate amalgam are disposed in the vent hole 46. The inside opening 40a facing the inside space of the air hole 40 is formed to be smaller than the outside opening 40b facing the outside space. A.

  In the present invention, a vent hole 46 is provided on the side wall of the case 44 that accommodates the reflector 14, and vent plates 38 and 54 similar to those used in the invention described in claim 1 are arranged in the vent hole 46. It is installed. Therefore, a sufficient amount of air can be taken into the inner space of the case 44 from the respective vent holes 40 of the vent plates 38 and 54. Moreover, even when the cover 16 is attached to the front opening of the reflector 14, even when the cover 16 is not attached, fragments of the ultrahigh pressure discharge lamp 12 and mercury are scattered in the outer space of the case 44. It can be surely prevented.

  According to the third aspect of the present invention, the reflector 14 having the concave reflecting surface 14a and the cylindrical discharge lamp mounting portion 34 provided at the center of the reflecting surface 14a is attached to the discharge lamp mounting portion 34. And a closed space S in which the sealing portion 22 attached to the discharge lamp mounting portion 34 is exposed, and the super high pressure discharge lamp 12 disposed in the center portion of the reflector 14. In the ultra-high pressure discharge lamp unit 56 including the space constituting member 18, the space constituting member 18 is provided with a vent hole 58 communicating the inner space and the outer space. In addition, vent plates 38 and 54 made of a metal that has a plurality of vent holes 40 and reacts with mercury to generate amalgam are disposed, and an inner opening 40a facing the inner space of the vent hole 40 is formed. The outside It is formed smaller than the outer opening 40b facing between an ultra-high pressure discharge lamp unit 56 ".

  In the present invention, the space constituting member 18 is provided with a ventilation hole 58, and ventilation holes 38 and 54 similar to those used in the inventions described in claims 1 and 2 are disposed in the ventilation hole 58. Yes. Therefore, a sufficient amount of air can be taken into the inner space S of the space constituting member 18 from the vent holes 40 of the vent plates 38 and 54. In addition, it is possible to reliably prevent the fragments and mercury of the ultrahigh pressure discharge lamp 12 from being scattered to the outside from the vent hole 58 provided in the space component member 18.

  The invention described in claim 4 is the “ultra-high pressure discharge lamp unit 10, 48, 52, 56” according to any one of claims 1 to 3, wherein “the vent hole 40 is formed by a burring method. It is characterized by.

  In the present invention, since the air holes 40 are formed by the burring method, a plurality of cylindrical protrusions 40 c constituting each air hole 40 are provided upright on the inner surface (inner surface) of the air plate 54. become. Therefore, the fragments and mercury of the ultra high pressure discharge lamp 12 can be efficiently captured by the cylindrical protrusion 40c. Moreover, since the contact area of the ventilation board 54 and mercury is widened by standing up the some cylindrical protrusion 40c, the effect which fixes mercury as "amalgam" can be heightened.

  According to the invention described in claims 1 to 4, since air can be taken into the inner space of the reflector and the inner space of the space constituent member from the vent hole, the temperature rise of the discharge lamp can be suppressed, and the long life of the discharge lamp is achieved. Can be achieved. In addition, in the ventilation plate arranged in the ventilation hole, the inner opening of the ventilation hole is formed smaller than the outer opening, so that it is possible to reliably prevent discharge lamp fragments and mercury from being scattered to the outside at the inner opening. The cooling air can be sufficiently taken in at the outer opening. The vent plate is made of metal that reacts with mercury to produce amalgam (aluminum, gold, silver, zinc, cadmium, lead, sodium, potassium, etc.), so the inside of the reflector when the discharge lamp bursts Mercury scattered in the space can be fixed as “amalgam” by reacting with the ventilation plate.

  According to the fourth aspect of the present invention, since a plurality of cylindrical protrusions constituting each air hole can be provided on the inner surface of the ventilation plate, the discharge lamp fragments and mercury are captured by the cylindrical protrusion. Can do. Moreover, since the contact area with mercury can be expanded by each cylindrical protrusion, mercury can be efficiently fixed as “amalgam”.

  FIG. 1 is a cross-sectional view showing an ultrahigh pressure discharge lamp unit 10 to which the present invention is applied, and FIG. 2 is a side view showing the ultrahigh pressure discharge lamp unit 10. The ultra high pressure discharge lamp unit 10 constitutes a light source device such as a projection type projector, and includes an ultra high pressure discharge lamp 12, a reflector 14, a cover 16, and a discharge lamp mounting member 18, and is equipped with an ultra high pressure. When the discharge lamp unit 10 is incorporated and used in a projection type projector or the like, an air flow path for supplying cooling air to the inner space of the reflector 14 is formed in the vicinity of the ultrahigh pressure discharge lamp unit 10. .

  As shown in FIG. 1, the ultra-high pressure discharge lamp 12 is a glass (quartz glass, hard glass) having a substantially spherical arc tube portion 20 and a rod-shaped sealing portion 22 extending straight from both ends of the arc tube portion 20. , Crystallized glass), and each sealing portion 22 is provided with an electrode rod 26, a lead rod 28, and a molybdenum foil 30 for electrically connecting them. An electrode 32 made of a refractory metal such as tungsten is provided between the ends of the electrode rod 26 inside the arc tube portion 20. In addition, at least one of high-pressure mercury, a rare gas such as argon, iodine, bromine, chlorine, fluorine, or the like is provided inside the arc tube portion 20 so that the internal pressure during lighting is a high pressure of 170 atm or higher. Two halogens (metal halide or halogen gas, etc.) are enclosed.

  The size of the ultra-high pressure discharge lamp 12 is not particularly limited, but is desirably small from the viewpoint of “brightness improvement”.

  The reflector 14 reflects light generated in the arc tube portion 20 of the ultrahigh pressure discharge lamp 12 forward, and as shown in FIGS. 1 and 2, a substantially rectangular front opening and a concave reflecting surface 14a. It has a bowl-shaped portion 14b made of quartz glass. A cylindrical discharge lamp mounting portion 34 into which one sealing portion 22 of the ultra-high pressure discharge lamp 12 is inserted and attached is formed in the central portion of the reflecting surface 14a in the bowl-shaped portion 14b. Further, at least one (two in this embodiment) vent 36 having a shape obtained by cutting off a part of the opening edge is formed on the side wall of the bowl-shaped portion 14b of the reflector 14. Thus, the inner space and the outer space of the reflector 14 are communicated with each other. A ventilation plate 38 as shown in FIG. 3 is disposed in each ventilation port 36 and is fixed by an adhesive or cement.

  As the material of the reflector 14, a metal such as aluminum, stainless steel, brass, nickel, chromium, nickel-chromium alloy, copper or copper-nickel alloy is used in addition to hard glass, crystallized glass, and quartz glass. Alternatively, the shape of the front opening of the reflector 14 may be a circle, an ellipse, an oval, or the like in addition to a substantially square shape. Further, the shape, position, size, number, and the like of the vent holes 36 can be changed as appropriate. However, considering the ease of processing and the effect on the reflection effect on the reflection surface 14a, the vent 36 may be formed in a shape in which a part thereof is cut off at the opening edge of the reflector 14 (the bowl-shaped portion 14b). desirable.

  As shown in FIG. 3, the ventilation plate 38 is a plate-like member made of a metal (aluminum, gold, silver, zinc, cadmium, lead, sodium, potassium, etc.) that reacts with mercury to generate amalgam. A plurality of ventilation holes 40 are formed on almost the entire surface of 38 to ensure air permeability. Each vent hole 40 is a substantially frustoconical through hole, and an inner opening 40a facing the inner space of the reflector 14 is formed smaller than an outer opening 40b facing the outer space. Therefore, fragments and mercury of the ultrahigh pressure discharge lamp 12 are prevented from flowing into the vent hole 40 in the inner opening 40a, and a sufficient amount of air is taken into the vent hole 40 in the outer opening 40b.

  As shown in FIG. 1, the cover 16 is a plate-like member that seals the front opening of the reflector 14, and is formed of a light-transmitting material such as hard glass or quartz glass.

  The discharge lamp mounting member 18 is for mounting the ultrahigh pressure discharge lamp 12 to the discharge lamp mounting portion 34 of the reflector 14 and has a cylindrical main body portion 18a made of ceramic or the like. An annular fitting groove 18b to be fitted to the end of the discharge lamp mounting portion 34 is formed at one end in the axial direction of the main body 18a, and a cap 42 is provided at the other end in the axial direction. An annular step 18c to be fixed is formed.

  When assembling the ultra high pressure discharge lamp unit 10, one sealing portion 22 of the ultra high pressure discharge lamp 12 is inserted into the discharge lamp mounting portion 34 of the reflector 14, and the end portion of the sealing portion 22 is attached to the discharge lamp. It fits into the main body 18a of the member 18, and both are firmly joined using an adhesive or cement. Subsequently, the fitting groove 18b of the discharge lamp mounting member 18 to which the ultrahigh pressure discharge lamp 12 is joined is fitted to the end of the discharge lamp mounting part 34, and both are firmly joined using an adhesive or cement. . Then, the cap 42 is fixed to the annular step portion 18c of the discharge lamp mounting member 18 using an adhesive or cement, and the cover 16 is fixed to the front opening of the reflector 14 using an adhesive or cement.

  When such an ultrahigh pressure discharge lamp unit 10 is used as a light source device of a projection type projector, the ultrahigh pressure discharge lamp unit 10 is disposed at a predetermined position in the projection type projector and blown from a blower (not shown). The air flow path is configured so that the air can be introduced from the vent 36 into the internal space of the reflector 14.

  When using the projection type projector, the ultra high pressure discharge lamp 12 of the ultra high pressure discharge lamp unit 10 is turned on and the blower (not shown) is driven. Then, the air sent from the blower is given to one vent 36 of the reflector 14 through the air flow path, and is introduced into the inner space of the reflector 14 through each vent hole 40 of the vent plate 38 disposed there. . Then, after this heat exchange with the ultra high pressure discharge lamp 12, the air is discharged to the outer space of the reflector 14 through each vent hole 40 of the vent plate 38 disposed in the other vent 36.

  Since the outer opening 40b of each ventilation hole 40 is formed to be relatively large, when introducing air into the inner space of the reflector 14, a sufficient amount of air can be taken into the ventilation hole 40. By introducing air into the inner space of the reflector 14, the temperature rise of the ultrahigh pressure discharge lamp 12 can be efficiently suppressed.

  When the ultra high pressure discharge lamp 12 ruptures due to the end of its life, etc., the fragments of the ultra high pressure discharge lamp 12 (enclosure container 24) and the mercury enclosed in the arc tube 20 scatter, and some of them It collides with a vent plate 38 disposed in the vent 36. However, since the inner opening 40a of the vent hole 40 is formed to be relatively small, debris and mercury do not pass through the inner opening 40a, and these do not scatter into the outer space of the reflector 14. In addition, since the mercury that has contacted the ventilation plate 38 is fixed as “amalgam”, this can also prevent the mercury from being scattered into the outer space.

  In the above-described embodiment, the ventilation plate 38 (FIG. 3) having “an effect of preventing scattering of fragments and mercury” is disposed in the ventilation port 36 formed in the reflector 14. Alternatively, as shown in FIG. 5, a vent 46 may be formed in the side wall of the box-shaped case 44 that accommodates the reflector 14, and a vent plate 38 (FIG. 3) may be disposed in the vent 46.

  The ultra high pressure discharge lamp unit 48 shown in FIG. 4 includes a reflector 14 having a concave reflecting surface 14 a, an ultra high pressure discharge lamp 12 attached to the center of the reflector 14, and a case 44 that houses the reflector 14. ing. A cover 16 is attached to the front opening of the reflector 14, and at least one (two in this embodiment) ventilation having a shape obtained by cutting off a part of the opening edge on the side wall of the reflector 14. A mouth 36 is formed. A cover 50 is attached to the front opening of the case 44, and a vent hole 46 is formed on the side wall of the case 44 to communicate the inner space with the outer space. Is provided with a ventilation plate 38 (FIG. 3). In this embodiment, the vent plate 38 is not disposed in the vent 36 of the reflector 14, and the function of the vent plate 38 is exhibited in the vent of the case 44.

  The ultra high pressure discharge lamp unit 52 shown in FIG. 5 includes a reflector 14 having a concave reflecting surface 14 a, an ultra high pressure discharge lamp 12 attached to the center of the reflector 14, and a case 44 that houses the reflector 14. ing. A cover 50 is attached to the front opening of the case 44, and a vent hole 46 is formed on the side wall of the case 44 to communicate the inner space and the outer space. Is provided with a ventilation plate 38 (FIG. 3). In this embodiment, the cover 16 is not attached to the front opening of the reflector 14, and the air taken into the case 44 is given to the inner space from the front opening of the reflector 14.

  In addition, in the ventilation plate 38 used in each of the above-described embodiments, the inner surface constituting the inner space is formed flat (FIG. 3), but the inner surface of the ventilation plate may be provided with irregularities. . Providing irregularities on the inner surface of the ventilation plate can enhance the effect of capturing debris and mercury. Further, since the contact area with mercury is widened, it becomes possible to efficiently fix mercury as “amalgam”, and the effect of preventing the scattering of mercury can be enhanced.

  In addition, as a method of providing unevenness on the inner surface of the ventilation plate, a method by burring, cutting, pressing, or the like can be considered. It is desirable. The ventilation plate 54 shown in FIG. 6 is formed by simultaneously forming the ventilation hole 40 and the projections and depressions by burring. In the ventilation plate 54, a plurality of cylindrical projections 40c constituting the ventilation hole 40 appear on the inner surface as projections and depressions. ing.

  Further, in each of the above-described embodiments, the ventilation plates 38 and 54 are disposed in the ventilation ports 36 and 46 for introducing air into the inner space of the reflector 14, but the ultrahigh pressure discharge lamp shown in FIG. Like the unit 56, the ventilation plates 38 and 54 may be disposed in the ventilation hole 58 for introducing air into the closed space S where the sealing portion 22 is exposed.

  The super high pressure discharge lamp unit 56 shown in FIG. 7 includes a reflector 14 having a concave reflecting surface 14a and a cylindrical discharge lamp mounting portion 34 provided at the center of the reflecting surface 14a, and a discharge lamp mounting portion 34. It has the sealing part 22 to be attached, and constitutes a closed space S in which the ultra-high pressure discharge lamp 12 disposed in the center part of the reflector 14 and the sealing part 22 attached to the discharge lamp attachment part 34 are exposed. And a discharge lamp mounting member 18 as a “space component”. The discharge lamp mounting member 18 is provided with a vent 58 that communicates the inner space (that is, the closed space S) and the outer space. The vent 58 has a vent plate 38 (FIG. 3), 54 (FIG. 6) is provided. In this embodiment, the temperature rise of the ultrahigh pressure discharge lamp 12 can be suppressed by the air introduced from the vent holes 40 of the vent plates 38 and 54.

The inventors confirmed the effect of the present invention by the following experiment.
[experimental method]
(1) Sample As samples, the following “Examples 1 to 4” and “Comparative Examples 1 to 4” corresponding thereto were prepared.

  In “Example 1”, in the ultrahigh pressure discharge lamp unit 10 shown in FIG. 1, the conditions of the ultrahigh pressure discharge lamp 12 are set to 300 W, DC, internal pressure during lighting: 170 atm, halogen: bromine, and the reflector 14 Is set to a parabolic type, 80 × 80, and F = 8.5.

  In “Example 2”, in the ultrahigh pressure discharge lamp unit 48 shown in FIG. 4, the conditions of the ultrahigh pressure discharge lamp 12 are set to 270 W, DC, lighting internal pressure: 180 atm, halogen: bromine, and the reflector 14 Is set to a parabolic type, 65 × 70, and F = 7.5.

  In “Example 3”, in the ultrahigh pressure discharge lamp unit 52 shown in FIG. 5, the conditions of the ultrahigh pressure discharge lamp 12 are set to 210 W, DC, lighting internal pressure ... 195 atm, halogen ... bromine, and the reflector 14 Are set to be elliptical, 60 × 60, and F = 9.5.

  “Example 4” is the same ultra-high pressure discharge lamp unit as “Example 1” except that the ventilation plate 54 (FIG. 6) is used.

“Comparative Examples 1 to 4” are ultrahigh pressure discharge lamp units having the same configuration as “Examples 1 to 4” except that a conventional mesh-shaped ventilation plate is used.
(2) Experimental Method For each sample (Examples 1 to 4, Comparative Examples 1 to 4), the temperature of the top portion of the ultrahigh pressure discharge lamp 12 during lighting was measured. In addition, the presence or absence of fragments and mercury when the ultrahigh pressure discharge lamp 12 burst was examined.
[Experimental result]
The experimental results are as shown in [Table 2].

  In [Table 2], when “Examples 1 to 4” and “Comparative Examples 1 to 4” are compared, it is understood that the temperature of the top portion of the ultrahigh pressure discharge lamp 12 is the same. In “Comparative Examples 1 to 4,” debris and mercury are scattered, but in “Examples 1 to 4,” it is understood that no debris and mercury are scattered. From this, it can be seen that according to the present invention, scattering of fragments and mercury can be reliably prevented without impairing the cooling effect.

It is sectional drawing which shows an ultra-high pressure discharge lamp unit. It is a side view which shows an ultra-high pressure discharge lamp unit. It is the front view and sectional drawing which show a ventilation board. It is sectional drawing which shows another ultrahigh pressure discharge lamp unit (with cover / cased). It is sectional drawing which shows another super-high pressure discharge lamp unit (without a cover / with a case). It is the front view and sectional drawing which show another ventilation board (burring process). It is sectional drawing which shows another super-high pressure discharge lamp unit (deformation of a vent hole).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 48, 52, 56 ... Super high pressure discharge lamp unit 12 ... Super high pressure discharge lamp 14 ... Reflector 16, 50 ... Cover 18 ... Discharge lamp attachment member 20 ... Light emission tube part 22 ... Sealing part 34 ... Discharge lamp attachment part 36 , 46, 58 ... vents 38, 54 ... vent plate 40 ... vent 40a ... inner opening 40b ... outer opening 40c ... cylindrical projection 44 ... case

Claims (4)

In an ultra high pressure discharge lamp unit, comprising: a reflector having a concave reflecting surface; an ultra high pressure discharge lamp attached to a central portion of the reflector; and a translucent cover attached to a front opening of the reflector.
The side wall of the reflector is provided with a vent that communicates the inner space with the outer space. The vent has a plurality of vent holes and reacts with mercury to generate amalgam. An ultra-high pressure discharge lamp unit characterized in that a vent plate made of metal is disposed, and an inner opening facing the inner space of the vent hole is formed smaller than an outer opening facing the outer space. . A reflector having a concave reflecting surface; an ultra-high pressure discharge lamp attached to a central portion of the reflector; a case accommodating the reflector; and a translucent cover attached to a front opening of the case. In the ultra high pressure discharge lamp unit,
The side wall of the case is provided with a vent that communicates the inner space and the outer space. The vent has a plurality of vent holes and reacts with mercury to generate amalgam. An ultra-high pressure discharge lamp unit characterized in that a vent plate made of metal is disposed, and an inner opening facing the inner space of the vent hole is formed smaller than an outer opening facing the outer space. . A reflector having a concave reflecting surface and a cylindrical discharge lamp mounting portion provided at a central portion of the reflecting surface; and a sealing portion attached to the discharge lamp mounting portion, and disposed at a central portion of the reflector. In the ultra-high pressure discharge lamp unit comprising: an installed ultra-high pressure discharge lamp; and a space constituting member that constitutes a closed space in which the sealing portion attached to the discharge lamp mounting portion is exposed.
The space component member is provided with a vent hole that communicates the inner space and the outer space. The vent hole has a plurality of vent holes and reacts with mercury to generate amalgam. An ultra-high pressure discharge lamp unit in which a vent plate made of metal is disposed, and an inner opening facing the inner space of the vent hole is formed smaller than an outer opening facing the outer space.   The ultra-high pressure discharge lamp unit according to any one of claims 1 to 3, wherein the vent hole is formed by a burring method.