JP4445894B2 - Ultra high pressure discharge lamp unit - Google Patents

Description

  The present invention relates to an ultra-high pressure discharge lamp unit used for a projection projector or the like that projects information displayed on a video element 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 light source device has a strong demand for “brightness improvement”. Conventionally, the discharge lamp has a high pressure (filled with 0.15 mg / mm ³ or more of mercury) or the discharge lamp has been downsized (tube). The wall load was 0.8 W / mm ² or more). In addition, when the discharge lamp is increased in pressure, the frequency of bursting increases, so that a cover is attached to the opening of the reflector and sealed in order to prevent scattering of fragments and mercury at the time of bursting.

  When the cover is attached to the opening of the reflector in this way and the reflector is sealed, it becomes difficult to release the heat inside the reflector to the outside, and the temperature of the discharge lamp becomes too high. For this reason, there is a problem that the life of the discharge lamp is shortened, which is against the request for “long life”. In particular, when the discharge lamp is downsized for "brightness improvement", this problem is remarkable as a result of the temperature inside the reflector easily increasing.

  In view of this, a technique has been proposed in which a heat transfer body is disposed at the connection portion between the discharge lamp and the reflector in order to release the heat inside the reflector to the outside (see, for example, Patent Document 1).

  According to this technology, the heat inside the reflector can be released to some extent through the heat transfer body, but the temperature of the arc tube portion of the discharge lamp, particularly the temperature above the arc tube portion in the lighting position, is reduced. It could not be lowered sufficiently. For this reason, the devitrification phenomenon of the quartz glass is accelerated on the upper side of the arc tube portion of the discharge lamp, and there is a problem that the brightness is rapidly reduced. That is, even with such a technique, it has not been possible to extend the life of the discharge lamp.

  In order to solve such a problem, as shown in FIGS. 10 and 11, an ultrahigh pressure discharge lamp 2 including a sealed container 1 in which an arc tube portion 1 a and a sealing portion 1 b are formed is used as a reflector 3 having a concave reflecting surface. A substantially cylindrical heat transfer member 4 whose tip is in contact with the side surface of the arc tube portion 1a is closely fixed to the entire sealing portion 1b fixed to the central portion of the reflector 3. An ultra-high pressure discharge lamp unit 5 has been proposed.

According to this technique, the temperature of the arc tube portion 1a of the ultra-high pressure discharge lamp 2 can be lowered to a predetermined temperature, thereby preventing the devitrification phenomenon of the arc tube portion 1a and extending the life of the discharge lamp 2 to some extent. be able to.
JP-A-5-325605

  However, as shown in FIGS. 10 and 11, in the conventional technique in which the heat transfer member 4 is tightly fixed over the entire circumference of the side surface of the arc tube portion 1a of the super high pressure discharge lamp 2 to the entire surface of the sealing portion 1b, the arc tube portion The connecting portion between 1a and the sealing portion 1b is also sufficiently cooled, and a low temperature region is formed in the vicinity of the portion. For this reason, the evaporation of mercury enclosed in the envelope 1 is delayed and it takes time to increase the internal pressure, and the time until the brightness reaches sufficient brightness, that is, the start-up time is lengthened. There was a problem that the brightness (that is, the brightness predicted at the time of design) was not achieved.

  Further, among the temperatures of the arc tube portion 1a, particularly when the lower temperature in the lighting posture is lowered more than necessary, the halogen cycle becomes dull and blackening occurs, and in this case, the brightness is lowered. there were.

  Therefore, the main subject of the present invention is to provide an ultra high pressure discharge lamp unit suitable for a projection type projector that meets user demands such as “reduction of startup time”, “improvement of brightness” and “extension of life”. There is.

According to the first aspect of the present invention, “the central portion of the reflector 14 is interposed between the reflector 14 having a concave reflecting surface and the sealing portion 20 of the envelope container 22 in which the arc tube portion 18 and the sealing portion 20 are formed. An ultra-high pressure discharge lamp unit 10 including an ultra-high pressure discharge lamp 12 attached to a reflector 14 and a translucent cover 16 attached to an opening of the reflector 14, and an ultra-high pressure discharge lamp unit 10 attached to a central portion of the reflector 14. The sealing portion 20 of the high-pressure discharge lamp 12 has its tip abutting against the side surface of the arc tube portion 18 over the entire circumferential direction , and the inner peripheral surface on the tip side is enlarged to seal the arc tube portion 18. An ultra-high pressure discharge lamp unit 10A is characterized in that a substantially cylindrical heat transfer member 32A formed so that a space S is formed at the position of the connecting portion with the portion 20 is closely fixed.

  In the present invention, since the tip of the heat transfer member 32A attached to the sealing portion 20 of the ultra high pressure discharge lamp 12 is in contact with the side surface of the arc tube portion 18 of the envelope container 22, the heat of the arc tube portion 18 is obtained. Can be taken directly to the outside of the reflector 14. That is, the arc tube portion 18 can be cooled. Since the heat transfer member 32A is formed so that a space S is generated at the position of the connecting portion between the arc tube portion 18 and the sealing portion 20, the connecting portion between the arc tube portion 18 and the sealing portion 20 is It is possible to prevent a low temperature region from being generated in the vicinity of the portion without being cooled excessively.

  According to the second aspect of the present invention, “the central portion of the reflector 14 is interposed between the reflector 14 having a concave reflecting surface and the sealing portion 20 of the envelope container 22 in which the arc tube portion 18 and the sealing portion 20 are formed. An ultra-high pressure discharge lamp unit 10 including an ultra-high pressure discharge lamp 12 attached to a reflector 14 and a translucent cover 16 attached to an opening of the reflector 14, and an ultra-high pressure discharge lamp unit 10 attached to a central portion of the reflector 14. The sealing portion 20 of the high-pressure discharge lamp 12 has a substantially cylindrical or semi-cylindrical shape for heat transfer whose tip is in contact with the upper side surface of the arc tube portion 18 in a predetermined lighting posture and is not in contact with the lower side surface. This is an ultra-high pressure discharge lamp unit 10B characterized in that the member 32B is closely fixed.

  In the present invention, the tip of the heat transfer member 32B attached to the sealing portion 20 of the ultra high pressure discharge lamp 12 is in contact with the upper side surface of the arc tube portion 18 of the envelope container 22 that is relatively hot, and Since it does not contact the lower side surface of the arc tube portion 18 which is relatively low in temperature, the upper side of the arc tube portion 18 can be selectively cooled, and the lower side of the arc tube portion 18 having a relatively low temperature is more than necessary. It is possible to prevent cooling. For this reason, it can prevent that the connection part of the arc_tube | light_emitting_tube part 18 and the sealing part 20 is cooled too much, and can produce | generate a low temperature area | region, and can prevent the slowdown of the halogen cycle below the arc_tube | light_emitting_tube_part 18. FIG.

  According to a third aspect of the present invention, in the ultrahigh pressure discharge lamp unit 10 according to the second aspect of the present invention, “a space S is generated at the position where the heat transfer member 32 is connected to the arc tube portion 18 and the sealing portion 20. Thus, it is possible to more effectively prevent a low temperature region from occurring at the connecting portion of the arc tube portion 18 and the sealing portion 20.

  According to a fourth aspect of the present invention, there is provided the ultrahigh pressure discharge lamp unit 10 according to any one of the first to third aspects of the present invention: “The heat transfer member 32 has a tip portion 40 that contacts the side surface of the arc tube portion 18 made of ceramic. And a rear end portion 42 that is connected to the distal end portion 40 and guides the heat of the arc tube portion 18 to the end portion side of the sealing portion 20 is made of a material having a higher thermal conductivity than ceramic. ".

  In the present invention, the heat transferred from the side surface of the arc tube portion 18 by the heat transfer member 32 can be released to the outside of the reflector 14 more smoothly. Further, since the tip portion 40 of the heat transfer member 32 that contacts the arc tube portion 18 is formed of ceramic having a low coefficient of thermal expansion, even if the heat transfer member 32 absorbs heat and becomes high temperature, the heat transfer member 32 It can prevent that the front-end | tip part 40 of the member 32 for a heat | fever expands thermally, and the side surface of the arc_tube | light_emitting_tube part 18 is pressed and destroyed.

According to a fifth aspect of the present invention, there is provided the ultrahigh pressure discharge lamp unit 10 according to any one of the first to fourth aspects of the present invention: “the envelope container 22 of the ultrahigh pressure discharge lamp 12 has an electrode 30 made of a refractory metal; , 0.15 mg / mm ³ or more of mercury, rare gas, and halogen are enclosed, and the tube wall load of the envelope container 22 is 0.8 W / mm ² or more. is there.

In the present invention, a compact ultra-high pressure discharge lamp 12 in which high-pressure mercury (0.15 mg / mm ³ or more) is enclosed in a sealed container 22 (the tube wall load is 0.8 W / mm ² or more) is used. "Brightness" can be improved.

  According to the invention described in claim 1, since the arc tube portion which is a heat source can be effectively cooled without causing a low temperature region in the vicinity of the connecting portion between the arc tube portion and the sealing portion of the sealed container, The devitrification phenomenon of the sealed container can be prevented, and a predetermined brightness can be maintained for a long time. In addition, since a low temperature region does not occur in the arc tube section, it is possible to shorten the start-up time from the start of lighting until reaching a sufficient brightness, and to obtain the original brightness of the discharge lamp.

  According to the invention described in claim 2 or 3, since the lower side of the arc tube portion that becomes relatively low temperature can be selectively cooled without excessively cooling the lower side of the arc tube portion that becomes relatively low temperature. The devitrification phenomenon of the sealed container and the slowing of the halogen cycle can be prevented, and the predetermined brightness can be maintained for a long time. In addition, since a low temperature region does not occur in the arc tube section, it is possible to shorten the start-up time from the start of lighting until reaching a sufficient brightness, and to obtain the original brightness of the discharge lamp.

  According to the invention described in claim 4, the heat inside the reflector can be released more smoothly to the outside of the reflector, and there is no possibility that the heat transfer member will thermally expand and break the arc tube portion. It is possible to achieve further “long life” of the ultra high pressure discharge lamp unit.

  Therefore, it is possible to provide an ultra-high pressure discharge lamp unit suitable for a projection type projector that meets user requirements such as “reduction of startup time”, “brightness improvement”, and “long life”.

  Hereinafter, the ultra high pressure discharge lamp unit of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partial cross-sectional view showing an ultrahigh pressure discharge lamp unit 10A according to an embodiment of the present invention [Embodiment 1], and FIG.

  As described above, the ultra high pressure discharge lamp unit 10A of the present invention is generally configured by the ultra high pressure discharge lamp 12, the reflector 14 that reflects the light of the ultra high pressure discharge lamp 12, and the cover 16.

As shown in FIG. 1, the ultra high pressure discharge lamp 12 is a quartz glass envelope 22 having a spherical arc tube portion 18 and a rod-like seal portion 20 extending straight from both ends of the arc tube portion 18. In each sealing portion 20, an electrode rod 24, a lead rod 26, and a molybdenum foil 28 that electrically connects them are disposed. An electrode 30 made of a refractory metal such as tungsten is provided between the ends of the electrode rod 24 in FIG. Further, inside the arc tube portion 24, at least one halogen (metal halide or metal halide) such as high pressure mercury of 0.15 mg / mm ³ or more, a rare gas such as argon, iodine, bromine, chlorine, and fluorine. Halogen gas).

The size of the ultra high pressure discharge lamp 12 is not particularly limited, but is desirably small for “brightness improvement”. In this embodiment, the load on the tube wall of the envelope container 22 is desirable. Is formed in such a size as to be 0.8 W / mm ² or more.

  In this ultra-high pressure discharge lamp 12, one sealing portion 20 is fixed to a discharge lamp mounting portion 14a provided at the center of a reflector 14 described later, and a heat transfer member 32A is attached to the sealing portion 20. It has been. A metal terminal 34 and an aluminum heat sink 36 are attached to the rear end of the sealing portion 20 to which the heat transfer member 32A is attached.

  The heat transfer member 32A is for releasing the heat generated by the ultrahigh pressure discharge lamp 12 to the outside of the reflector 14, and is made of a ceramic such as alumina and is substantially equal to the outer diameter of the sealing portion 20 (that is, sealing) This is a substantially cylindrical member having an inner diameter (which is in close contact with the surface of the portion 20).

  The distal end of the heat transfer member 32A is in contact with the side surface of the arc tube portion 18 over the entire circumferential direction, and the rear end thereof is extended to the rear end position of the sealing portion 20. Further, the inner peripheral surface of the distal end side of the heat transfer member 32 is radially enlarged, and the heat transfer member 32A is sealed with the sealing portion (with the distal end in contact with the side surface of the arc tube portion 18). When attached to 20, a predetermined space S is formed at the position of the connecting portion between the arc tube portion 18 and the sealing portion 20 (see FIG. 2). The outer periphery of the tip of the heat transfer member 32A is cut off (chamfered) so as not to block the optical path of the light emitted from the electrode 30. For this reason, even if the tip of the heat transfer member 32A is brought into contact with the side surface of the arc tube portion 18, it is possible to minimize the decrease in brightness.

  As a material constituting the heat transfer member 32A, a metal material such as cemented carbide or tungsten alloy or another material having a high thermal conductivity such as carbon (carbon compound) is used instead of the above-described ceramic. It may be.

  Further, as the shape of the heat transfer member 32A on the front end side, in FIG. 2, the inner peripheral surface of the front end side is uniformly expanded through the step portion, and the position of the connecting portion between the arc tube portion 18 and the sealing portion 20 Although the shape of the space S is shown in FIG. 3, for example, as shown in FIG. 3, the space S may be formed by expanding the tip-side inner peripheral surface in a tapered shape toward the tip. . In other words, when the heat transfer member 32A is attached to the sealing portion 20, if the shape is such that a predetermined space S is generated at the position of the connecting portion between the arc tube portion 18 and the sealing portion 20, the heat transfer is performed. The shape of the inner peripheral portion on the distal end side of the member 32A for use may be any.

  The reflector 14 reflects light generated in the arc tube portion 18 of the ultrahigh pressure discharge lamp 12 forward, and is formed in a parabolic shape having a concave reflecting surface with quartz glass. A mirror-like reflecting surface is formed on the inner surface of the reflector 14, and a cylindrical discharge lamp is attached to the central portion of the reflector 14 so that one sealing portion 20 of the ultrahigh pressure discharge lamp 12 is inserted. A portion 14a is formed (see FIG. 1).

  The cover 16 (FIG. 1) is a plate-like member that seals the opening of the reflector 14, and is formed of a light-transmitting material such as quartz glass.

  When assembling the ultra high pressure discharge lamp unit 10A configured as described above, first, the heat transfer member 32A is fitted into one sealing portion 20 of the ultra high pressure discharge lamp 12, and the sealing portion 20 is attached. The discharge lamp mounting portion 14a of the reflector 14 is inserted. Subsequently, the metal terminal 34 and the heat radiating plate 36 are attached to the rear end of the sealing portion 20 disposed outside the reflector 14, and the sealing portion 20 and the heat transfer member 32A are attached using an inorganic adhesive 38 such as cement. It fixes to the discharge lamp attaching part 14a. Then, the cover 16 is attached to the opening of the reflector 14 using an adhesive or the like.

  When using the ultra high pressure discharge lamp unit 10A, the ultra high pressure discharge lamp unit 10A is disposed at a predetermined position in the projection type projector (so that the ultra high pressure discharge lamp unit 10A is in a predetermined lighting posture) and is lit. Connect to power supply with circuit. Then, a voltage is applied to the ultra high pressure discharge lamp 12 to light it. As a result, the sealed container 22 (more specifically, the arc tube portion 18) generates heat as it is turned on, but the tip of the heat transfer member 32A attached to the sealing portion 20 of the ultrahigh pressure discharge lamp 12 is sealed. Since it is in contact with the side surface of the arc tube portion 18 of the body container 22, the heat transfer member 32 </ b> A can directly take the heat of the arc tube portion 18 and let it escape to the outside of the reflector 14. That is, the arc tube portion 18 can be cooled. For this reason, it is possible to prevent the ultrahigh pressure discharge lamp 12 from being ruptured due to a temperature rise, to prevent the arc tube portion 18 from being devitrified, and to extend the life of the ultrahigh pressure discharge lamp 12.

  Further, since the heat transfer member 32A is formed so that a space S is formed at the position of the connecting portion between the arc tube portion 18 and the sealing portion 20, the connecting portion between the arc tube portion 18 and the sealing portion 20 is It is possible to prevent a low temperature region from being generated in the vicinity of the portion without being cooled excessively. For this reason, it is possible to shorten the time (that is, the start-up time) from the start of lighting until sufficient illuminance (specifically, about 80% of the maximum illuminance) is obtained, and to obtain the original brightness of the discharge lamp. Can do.

  In this embodiment, it is needless to say that sufficient “brightness” can be obtained because the small ultrahigh pressure discharge lamp 12 in which high-pressure mercury is sealed is used.

  In the above-described embodiment, the quartz glass reflector 14 is used, but a reflector 14 made of metal (aluminum, stainless steel, brass, nickel, chromium, nickel-chromium alloy, copper, copper-nickel alloy, etc.) is used. You may make it use. In this case, since the reflector 14 has a high thermal conductivity, a cooling effect due to heat radiation can be expected.

  Further, in the above-described embodiment, the parabolic reflector 14 is used, but the shape of the reflector 14 may be any shape that can form a concave reflecting surface. For example, the shape of the opening is elliptical or rectangular. It may be a thing.

  Next, the ultra-high pressure discharge lamp unit 10B of [Embodiment 2] shown in FIGS. 4 and 5 will be described. The difference from the above-mentioned [Embodiment 1] is that the heat transfer member 32 is replaced with a heat transfer member 32A whose front end is in contact with the entire circumference of the side surface of the arc tube portion 18, and the front end is predetermined. The heat transfer member 32B is used in contact with the upper side surface of the arc tube portion 18 in the lighting position and not in contact with the lower side surface of the arc tube portion 18. Since the other parts are the same as those in [Embodiment 1], the description in [Embodiment 1] will be used to replace the description in this embodiment.

  The heat transfer member 32B is for releasing the heat generated by the ultrahigh pressure discharge lamp 12 to the outside of the reflector 14, and is made of a ceramic such as alumina and is substantially equal to the outer diameter of the sealing portion 20 (that is, sealing) It is a substantially cylindrical member having an inner diameter (which is in close contact with the part surface).

  The tip of the heat transfer member 32B is notched at the tip side so as to abut on the upper side surface of the arc tube portion 18 when it takes a predetermined lighting posture and not on the lower side surface. The rear end is extended to the rear end position of the sealing portion 20. The outer periphery of the tip of the heat transfer member 32B is cut (chamfered) so as not to block the optical path of the light emitted from the electrode 30.

  As the material constituting the heat transfer member 32B, a metal material such as cemented carbide or tungsten alloy or another material having a high thermal conductivity such as carbon (carbon compound) is used instead of the above-described ceramic. It may be.

  In the ultrahigh pressure discharge lamp unit 10B equipped with the heat transfer member 32B having such a configuration, the end of the heat transfer member 32B attached to the sealing portion 20 of the ultrahigh pressure discharge lamp 12 has a relatively high temperature. Since it is in contact with the upper side surface of the arc tube portion 18 of the container 22 and is not in contact with the lower side surface of the arc tube portion 18 that is relatively low in temperature, the upper side of the arc tube portion 18 can be selectively cooled, It is possible to prevent the lower side of the arc tube portion 18 having a relatively low temperature from being cooled more than necessary. Therefore, it is possible to prevent the bursting of the ultra-high pressure discharge lamp 12 and the devitrification phenomenon of the envelope container 22 due to the temperature rise, and it is possible to prevent the blackening phenomenon associated with the slowing of the halogen cycle below the arc tube portion 18. It is possible to maintain a predetermined brightness for a period.

  Further, since the lower side surface of the arc tube portion 18 is not cooled, it is possible to prevent the low temperature region from being generated by excessively cooling the connecting portion between the arc tube portion 18 and the sealing portion 20. For this reason, it is possible to shorten the starting time from the start of lighting until reaching a sufficient brightness, and to obtain the original brightness of the discharge lamp.

  In the above-described example, as shown in FIGS. 4 and 5, the heat transfer member 32 </ b> B is shown in which only the lower end portion is notched, but the heat transfer member 32 </ b> B emits light at least in a predetermined lighting posture. As long as the upper side of the tube part 18 is in close contact with the entire upper surface of the sealing part 20 and the upper side of the sealing container 22 that is relatively hot can be selectively cooled, the mode is not limited. For example, the entire lower side of the heat transfer member 32B may be cut out to form a substantially semi-cylindrical shape.

  Next, the ultra-high pressure discharge lamp unit 10C of [Embodiment 3] shown in FIGS. 6 and 7 will be described. The difference from the above-mentioned [Embodiment 2] is that the heat transfer member 32 is a heat transfer member in which a space S is formed at the position where the arc tube portion 18 and the sealing portion 20 are connected at the tip. This is a point using 32C.

  By using such a heat transfer member 32C, in addition to the operation and effect of the above-described [Embodiment 2], it is more effective that a low temperature region is generated in the connecting portion between the arc tube portion 18 and the sealing portion 20. Can be prevented. For this reason, the activation time can be further shortened and higher brightness can be obtained. Since the other parts are the same as those in the [Example 2], the description in the [Example 2] is cited and replaced with the description in the present example.

  Next, an ultrahigh pressure discharge lamp unit 10D of [Embodiment 4] shown in FIGS. 8 and 9 will be described. The difference from the above-mentioned [Embodiment 1] is that the heat transfer member 32 is a heat transfer member 32A whose tip is in contact with the entire circumference of the side surface of the arc tube portion 18 and formed entirely of ceramic. Instead, the tip portion 40 that contacts the side surface of the arc tube portion 18 is formed of ceramic, and is connected to the tip portion 40 so that the heat in the arc tube portion 18 and the reflector 14 is transferred to the end portion side of the sealing portion 20. This is a point using a heat transfer member 32 </ b> D in which the rear end portion 42 leading to the side is made of a material having a higher thermal conductivity than ceramic. Since the other parts are the same as those in [Embodiment 1], the description in [Embodiment 1] will be used to replace the description in this embodiment.

  The heat transfer member 32D is for releasing the heat generated by the ultra-high pressure discharge lamp 12 to the outside of the reflector 14, and is substantially the same as the outer diameter of the sealing portion 20 (that is, close to the sealing portion surface). ) A substantially cylindrical member having an inner diameter.

  The heat transfer member 32D is made of a ceramic such as aluminum nitride, and is made of a tip 40 that contacts the side surface of the arc tube 18 and a metal material such as copper having a higher thermal conductivity than the ceramic. The rear end portion 42 is provided continuously. And the front-end | tip of the front-end | tip part 40 contact | abuts to the whole circumferential direction of the arc_tube | light_emitting_tube part 18, and the inner peripheral surface is diameter-expanded radially, and when the front-end | tip part 40 is attached to the sealing part 20, it is. The predetermined space S is formed at the position of the connecting portion between the arc tube portion 18 and the sealing portion 20. Further, the outer periphery of the tip of the tip 40 is cut (chamfered) so as not to block the optical path of the light emitted from the electrode 30.

  In the ultrahigh pressure discharge lamp unit 10D equipped with the heat transfer member 32D having such a configuration, in addition to the operation and effect of the above-described [Example 1], the heat transferred by the heat transfer member 32D from the side surface of the arc tube portion 18 is obtained. It is possible to escape to the outside of the reflector 14 more smoothly. Further, since the tip portion 40 of the heat transfer member 32D that contacts the arc tube portion 18 is formed of ceramic having a low coefficient of thermal expansion, even if the heat transfer member 32D absorbs heat and becomes high temperature, the heat transfer member 32D is in contact with the arc tube portion 18. It is possible to prevent the distal end portion 40 of the heating member 32D from thermally expanding and pressing and destroying the side surface of the arc tube portion 18.

  In the above example, the case where the shape of the tip 40 is the same as the shape of the tip of the heat transfer member 32A of [Example 1] has been described. However, the shape of the tip 40 is [Example 2]. And you may make it make it the same shape as the front end side of the members 32B and 32C for heat transfer shown in [Example 3]. That is, if the front end portion 40 of the heat transfer member 32D is formed of a ceramic having a low coefficient of thermal expansion and the rear end portion 42 is made of a material having a higher thermal conductivity than the front end portion 40, the above-mentioned There is an effect.

The inventors confirmed the effects of “reduction of startup time”, “brightness improvement”, and “extension of life” according to the above-described embodiments by the following experiments. That is, the heat transfer member 32 of each of the above-described embodiments is applied to a 150 W DC lighting ultrahigh pressure discharge lamp 12 using a mercury amount of 0.22 mg / mm ³ , a tube wall load of 1.2 W / mm ² , and bromine as a halogen. Was prepared, and an ultra-high pressure discharge lamp unit 10 attached to the reflector 14 having F1 = 14.03 and F2 = 109.0 was prepared and used as a sample. Further, the same ultrahigh pressure discharge lamp 12 as that of the sample was used, and the heat transfer member 4 shown in FIGS. 9 and 10 was attached thereto to prepare an ultrahigh pressure discharge lamp unit 5, which was used as a comparative example.

  And about each sample of Examples 1-4 and a comparative example, (1) Rise time until illumination intensity reaches 80% from lighting start, (2) Relative brightness when the maximum illumination intensity of a comparative example is set to 100 (3) Surface temperature (top temperature) above the arc tube 18 in a predetermined lighting attitude, (4) Surface temperature (bottom temperature) below the arc tube 18 in a predetermined lighting attitude, and (5) Lamp voltage Was measured. The results are shown in Table 1. Each measurement item was measured three times, and Table 1 shows the average value.

  From Table 1, it can be seen that, according to the ultra high pressure discharge lamp units 10 of Examples 1 to 4, it is possible to achieve “reduced start-up time” and “brightness improvement” as compared with the comparative example which is the prior art. Moreover, since the top temperature is lower than that of the comparative example, it can be seen that the rise of the top temperature, which causes the devitrification phenomenon of the arc tube portion 18, is suppressed more than that of the comparative example. Furthermore, since the bottom temperature is higher than that of the comparative example, it can be seen that an unnecessary decrease in the bottom temperature that causes the halogen cycle to become slow is suppressed more than in the comparative example. That is, it can be seen that the devitrification phenomenon of the arc tube portion 18 and the blackening phenomenon due to the halogen cycle slowing can be suppressed as compared with the comparative example, and the “long life” of the ultrahigh pressure discharge lamp 12 can be realized.

It is a fragmentary sectional view which shows the ultra-high pressure discharge lamp unit (Example 1) of this invention. It is a principal part enlarged view in FIG. It is a principal part enlarged view which shows the modification of the member for heat transfer in Example 1. FIG. It is a fragmentary sectional view which shows the ultra-high pressure discharge lamp unit (Example 2) of this invention. It is a principal part enlarged view in FIG. It is a fragmentary sectional view which shows the ultra-high pressure discharge lamp unit (Example 3) of this invention. It is a principal part enlarged view in FIG. It is a fragmentary sectional view which shows the ultra-high pressure discharge lamp unit (Example 4) of this invention. It is a principal part enlarged view in FIG. It is a fragmentary sectional view showing the conventional super-high pressure discharge lamp unit. It is a principal part enlarged view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Super high pressure discharge lamp unit 12 ... Super high pressure discharge lamp 14 ... Reflector 14a ... Discharge lamp attaching part 16 ... Cover 18 ... Arc tube part 20 ... Sealing part 22 ... Sealing container 24 ... Electrode bar 26 ... Lead bar 28 ... Molybdenum foil 30 ... Electrode 32 ... Heat transfer member 34 ... Metal terminal 36 ... Heat sink 38 ... Inorganic adhesive 40 ... Front end 42 ... Rear end

Claims (5)

A reflector having a concave reflecting surface; an ultrahigh pressure discharge lamp attached to a central portion of the reflector through the sealing portion of the sealed container in which the arc tube portion and the sealing portion are formed; and an opening of the reflector An ultra-high pressure discharge lamp unit comprising a translucent cover attached to the part,
The sealing portion of the ultra-high pressure discharge lamp attached to the central portion of the reflector has its tip abutting against the side surface of the arc tube portion over the entire circumferential direction , and the inner peripheral surface on the tip side is enlarged in diameter. ultra-high pressure discharge lamp unit which has been substantially cylindrical heat transfer member formed to space occurs in the position of the connecting portion between the luminous bulb portion and a sealing portion, characterized in that it is tightly fixed. A reflector having a concave reflecting surface; an ultrahigh pressure discharge lamp attached to a central portion of the reflector through the sealing portion of the sealed container in which the arc tube portion and the sealing portion are formed; and an opening of the reflector An ultra-high pressure discharge lamp unit comprising a translucent cover attached to the part,
The sealing portion of the ultra-high pressure discharge lamp attached to the central portion of the reflector has a substantially cylindrical shape whose tip abuts on the upper side surface of the arc tube portion in a predetermined lighting posture and does not abut on the lower side surface. Alternatively, an ultra-high pressure discharge lamp unit in which a semi-cylindrical member for heat transfer is fixed in close contact.   The ultra high pressure discharge lamp unit according to claim 2, wherein the heat transfer member is formed so that a space is formed at a position of a connecting portion between the arc tube portion and the sealing portion.   The heat transfer member is formed of ceramic at a tip portion that abuts on a side surface of the arc tube portion, and is connected to the tip portion to guide the heat of the arc tube portion to the end side of the sealing portion. The ultra high pressure discharge lamp unit according to any one of claims 1 to 3, wherein a rear end portion is made of a material having a higher thermal conductivity than the ceramic. The envelope of the ultra high pressure discharge lamp is filled with an electrode made of a high melting point metal, mercury of 0.15 mg / mm ³ or more, a rare gas, and halogen, and the tube wall of the envelope The ultra high pressure discharge lamp unit according to any one of claims 1 to 4, wherein the load is 0.8 W / mm ² or more.

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