JP2002075014A - Lamp unit and image projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp unit that controls a rise in inner temperature and enhances operation reliability. SOLUTION: This lamp unit 500 is equipped with a lamp 200 with a mirror and a house 80. The lamp 200 with mirror comprises an arc tube 10, a discharge lamp 100 having a pair of sealing parts 20 and 20' and a reflecting mirror 60 having a front opening 60a, and is formed as non-encapsulated type structure. The house 80 has a transparent window 70 composed of material that can transmit the light outgone from the front opening 50a toward front of outgoing radiation direction 50 in the front opening 60a of the reflecting mirror 60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a lamp unit. In particular, the present invention relates to a lamp unit used as a light source for an image projection device such as a light source for a liquid crystal projector or a digital micromirror device (DMD) projector.

[0002]

2. Description of the Related Art In recent years, image projection apparatuses such as liquid crystal projectors and projectors using a DMD have been widely used as systems for realizing large-screen images. In such an image projection device, a high-pressure discharge lamp having high luminance is generally widely used. In a light source used in an image projection apparatus, since it is necessary to condense light to an image element included in an optical system of a projector, it is required to be close to a point light source in addition to high luminance. For this reason, among high-pressure discharge lamps, a short-arc type ultra-high-pressure mercury lamp, which is closer to a point light source and has a feature of high brightness, has been attracting attention as a promising light source. The short arc type ultra-high pressure mercury lamp can be used as a light source for a projector in the form of a lamp with a mirror in combination with a reflecting mirror.

With reference to FIG. 7, a description will be given of a mirror-equipped lamp 1200 provided with a conventional short arc type ultra-high pressure mercury lamp 1000. FIG. 7 schematically shows a mirror-equipped lamp 1200 in which an ultra-high pressure mercury lamp 1000 and a reflecting mirror 60 are combined.

[0004] The lamp 1200 with a mirror is a lamp 100.
0 and a reflecting mirror (mirror) 60 for reflecting light emitted from the lamp 1000. The lamp 1000 includes a substantially spherical arc tube (bulb) 110 made of quartz glass,
It also has a pair of sealing portions (seal portions) 120 and 120 ′ also made of quartz glass and connected to the arc tube 110. Inside the arc tube 110, there is a discharge space 115. In the discharge space 115, mercury (a mercury filling amount: for example, 150 to 250 mg / cm ³ ) and a rare gas (for example, argon of several tens of kPa) as a luminescent material. And a small amount of halogen are enclosed. In the discharge space 115, a pair of tungsten electrodes (W electrodes) 112 and 112 'are arranged to face each other at a fixed interval (for example, about 1.5 mm).

[0005] The W electrode 112 is welded to a molybdenum foil (Mo foil) 124 in the sealing portion 120.
2 and the Mo foil 124 are electrically connected to each other.
The sealing portion 120 has a glass portion 122 extended from the arc tube 110 and a Mo foil 124.
And the Mo foil 124 by pressure bonding to form the arc tube 1
The airtightness of the discharge space 115 in 10 is maintained. An external lead (Mo rod) 130 made of molybdenum is joined to one end of the Mo foil 124 by welding.
The o-foil 124 and the external lead 130 are electrically connected to each other. Note that the W electrode 112 ′ and the sealing portion 12
0 ′, the W electrode 112 and the sealing portion 12
Since it is the same as 0, the description is omitted.

Next, the operation principle of the lamp 1000 will be briefly described. When a starting voltage is applied to the W electrodes 112 and 112 ′ through the external leads 130 and the Mo foil 124, a discharge of argon (Ar) occurs, and the temperature in the discharge space 115 of the arc tube 110 increases due to the discharge. The mercury is thereby heated and vaporized. Then, the W electrode 1
At the center of the arc between 12 and 112 ', mercury atoms are excited to emit light. The higher the mercury vapor pressure of the lamp 1000, the higher the luminous efficiency. Therefore, the higher the mercury vapor pressure, the more suitable the light source of the image projection device. However, from the viewpoint of the physical pressure resistance of the arc tube 110, the range is 15 to 25 MPa. The lamp 1000 is used at a mercury vapor pressure of.

[0007] Light emitted from the lamp 1000 is reflected by the reflecting mirror 60 and is emitted toward the emission direction 50. The reflecting mirror 60 has a front opening 60a on the emission direction 50 side. As described above, the lamp 1000
The mercury vapor pressure of the lamp 1000 is set within the range of the physical pressure resistance of the arc tube 110 so as not to cause damage to the lamp. However, in order to prevent scattering in the event that the lamp is damaged or to prevent foreign matter from entering the mirror. To prevent contamination
A front glass 170 is attached to the front opening 60a. That is, the mirror-equipped lamp 1200 has a hermetically sealed structure so that scattered matters (glass pieces and mercury) generated in the unlikely event of lamp breakage do not go outside.
An external lead wire 65 is electrically connected to the external lead 130 of the sealing portion 120. The external lead wire 65 extends to the outside of the reflecting mirror 60 through the lead wire opening 62. Then, it is electrically connected to an external circuit (for example, a lighting circuit). The reflecting mirror 60 includes the discharge lamp 1
000 with the sealing portion 120 ′.
A base 55 is attached to one end of 0 '.

When the lamp 1200 with a mirror is combined with an optical system of an image projection apparatus (projector), as shown in FIG. 8A, a lamp unit is integrated with a lamp house 180 holding the lamp 1200 with a mirror. It is generally used as 1500.

FIG. 8A schematically shows the configuration of an image projection apparatus including a lamp unit 1500 and optical systems 190 (191 to 193), with a part of the lamp unit 1500 being cut away. FIG. 8B shows the lamp unit 1.
It is the perspective view which looked at 500 lamp houses 180 from the front. The lamp house 180 is a holder provided with an opening 180a for emitted light on the front surface, and has a non-sealed structure (an L-shaped house in the example of FIG. 8). By mounting the lamp house 180 at a predetermined position of the image projection device, the lamp unit 1500 is combined with the optical system 190 of the image projection device. The light emitted from the lamp unit 1500 is first transmitted to the lens 191.
Through an image display element 192 (for example, a DMD or a liquid crystal display element (LCD)) of the optical system 190, and then passes through a projection lens 193 to a screen (not shown).
Will be projected.

[0010]

Since the conventional lamp 1200 with a mirror has a sealed structure, heat generated from the lamp during the operation of the lamp is trapped inside the lamp 1200 with the mirror, and the inside of the lamp 1200 with the mirror is closed. There is a problem of high temperature. That is, if the lamp is damaged, the splatters of the lamp may fly out. In order to prevent the splatters from jumping out and to ensure the safety of the lamp, the structure of the lamp with mirror 1200 is sealed. Therefore, at the time of lamp operation, the ambient temperature in the interior 61 of the lamp with mirror 1200 rises, and accordingly, the temperature of the sealing portion 120 also rises. Molybdenum constituting the Mo foil 124 in the sealing portion 120 is 3
Since it has a property of being oxidized at a temperature of 50 ° C. or higher, the temperature of the lamp 1200 with the mirror becomes high.
4 (especially, the welded portion between the Mo foil 124 and the external lead 130) is oxidized, the conductivity of the Mo foil 124 is lost, and the lamp 1200 with a mirror does not operate.

Conventionally, a lamp 1200 with a mirror is used.
The size of the lamp with mirror 12
Since the inside 61 of the mirror lamp 1200 is relatively wide, the rise in the temperature of the inside 61 of the lamp 1200 with a mirror is often not so problematic. In addition, even if the temperature of the inside 61 of the mirror-equipped lamp 1200 rises due to a relatively short lamp life and a relatively low lamp output due to the deterioration of the light emitting portion 110 of the lamp. Even if it occurs, it was possible to relatively guarantee the operational reliability of the lamp.

However, today, the size of the lamp 1200 with a mirror has been reduced, so that the degree of temperature rise in the interior 61 of the lamp 1200 with a mirror has been increased, and the light emitting portion 110 of the lamp has been reduced. As longer lamp life (for example, several thousand hours or more) can be secured on a product basis as the characteristics are improved, it is necessary to use a mirror to ensure the lamp's operation reliability over a long period of time. The problem of the temperature rise inside 61 of the lamp 1200 cannot be ignored. Also,
With the development of higher power lamps underway,
By increasing the output of the lamp, the lamp 12
Since the temperature of 00 tends to be very high, the problem of the temperature rise in the interior 61 of the lamp 1200 with a mirror is considered to become more and more apparent.

Further, when a lamp 1200 with a mirror is incorporated in the optical system of the projector as a light source of a projector using a DMD, for example, a part of light emitted from the lamp 1200 with a mirror is reflected by the optical system and the lamp 1200 with a mirror is used. The present inventors have found that a phenomenon occurs in which the temperature of the lamp with mirror 1200 rises due to the incident light. When such a phenomenon occurs, even if the internal temperature of the lamp 1200 with a mirror is predicted from the output of the lamp and the design of the lamp 1200 with the mirror is performed, there may be a case where the operational reliability of the lamp cannot be guaranteed. become.

Further, the inside of the lamp with mirror 1200 61
The inventor of the present application also examined a method of making a hole in a part of the reflecting mirror 60 for the purpose of exchanging the air with the outside air. However, when a hole is made in a part of the reflecting mirror 60, the area for reflecting the light emitted from the lamp 1000 is reduced, so that the luminous flux emitted from the lamp 1200 with a mirror is reduced, and the optical performance of the lamp is reduced. Will be reduced. If a hole is made in a part of the reflecting mirror 60, the lamp 1200 with the mirror will not have a sealed structure, and thus a problem will arise in terms of safety.

The present invention has been made in view of the above points, and a main object of the present invention is to provide a lamp unit which suppresses a rise in temperature inside a lamp with a mirror and improves operation reliability.

[0016]

A lamp unit according to the present invention comprises a lamp with a mirror, and a house for holding the lamp with a mirror, wherein the lamp with a mirror is provided in a tube in which a luminescent substance is sealed. A discharge lamp having an arc tube in which electrodes of the pair are opposed to each other, and a pair of sealing portions for sealing each of a pair of metal foils electrically connected to each of the pair of electrodes; A reflector for reflecting light emitted from the lamp, the reflector having a front opening for emitting the reflected light, the lamp with a mirror is formed in an unsealed type structure, The house has a transmission window made of a material that transmits light emitted from the front opening in front of the front opening of the reflecting mirror in the emission direction.

It is preferable that the lamp with a mirror has an unsealed structure in which the front opening of the reflecting mirror is kept open.

It is preferable that the house has a structure capable of accommodating the scattered matter so that the scattered matter when the discharge lamp is scattered does not go outside.

The house preferably has an opening for exchanging gas between the inside and the outside of the house.

It is preferable that the house has a closed structure.

It is preferable that the house further includes a cooling convection device.

The transmission window may be made of glass or reinforced plastic.

It is preferable that the house is made of metal.

In one embodiment, the lamp unit is a lamp unit for an image projection apparatus in which the optical axes of the discharge lamp and the reflecting mirror are aligned.

In one embodiment, the lamp unit is configured as a replaceable unit as a light source for an image projection device.

An image projection apparatus according to the present invention includes the lamp unit described above, and an optical system using the lamp unit as a light source, and a discharge lamp included in the lamp unit.
The optical axes of the lamp unit and the optical system are aligned.

In one embodiment, the lamp unit is configured as a replaceable unit as a light source for an image projection device, and the optical system is an image selected from the group consisting of a digital micromirror device and a liquid crystal display element. It has at least a display element and a lens.

In the lamp unit of the present invention, the mirror-equipped lamp is formed in an unsealed type structure, and a house (housing) holding the mirror-equipped lamp is provided with a transmission window. Therefore, the gas inside the lamp with mirror can be moved into the house, so that the temperature rise inside the lamp with mirror during the lamp operation can be suppressed as compared with the related art. As a result, a lamp unit with improved lamp operation reliability can be provided. Further, since a rise in the temperature inside the lamp with a mirror can be suppressed, a lamp unit having a longer lamp life can be provided. Furthermore, since the transmission window is provided in front of the opening direction of the front opening of the reflecting mirror,
Even if flying objects (eg, glass fragments or mercury) generated at the time of lamp damage jump out from the front opening of the reflector, the scattering window can prevent the flying objects from jumping out. The mirror-equipped lamp included in the lamp unit of the present invention has, for example, an unsealed structure in which the front opening of the reflector is left open.

When the house has a structure capable of accommodating scattered objects, it is possible to prevent scattered objects generated when the lamp is damaged from coming out of the lamp unit, thereby further improving the safety of the lamp unit. Can be. If an opening for exchanging gas between the inside and the outside of the house is provided at least above the house in the vertical direction, it is possible to more effectively suppress the temperature rise inside the lamp with the mirror. In the case where the house has a closed structure, it is possible to prevent scattered matters generated when the lamp is broken from completely coming out of the house. If the house is provided with a cooling convection device, the gas in the house can be forcedly convected, so that the temperature rise of the mirror-equipped lamp can be more effectively suppressed. The transmission window can be made of glass or reinforced plastic. When the house is made of metal, the heat dissipation of the lamp unit can be improved, so that the temperature rise inside the mirror-equipped lamp can be further suppressed.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, components having substantially the same function are denoted by the same reference numeral for the sake of simplicity. (Embodiment 1) Embodiment 1 according to the present invention will be described with reference to FIGS. FIG. 1 schematically shows a configuration of a lamp unit 500 according to the present embodiment.

The lamp unit 500 includes a lamp 200 with a mirror and a house (lamp house) 80 for holding the lamp 200 with a mirror.
Reference numeral 0 includes a discharge lamp 100 and a reflecting mirror 60 that reflects light emitted from the discharge lamp 100. The mirror-equipped lamp 200 has a non-sealed structure in which a front glass is not provided in a front opening 60a of the reflecting mirror 60. That is, the reflector 60 is formed in a non-sealed structure in which the front opening 60a is left open. Further, the house 80 holding the mirror-equipped lamp 200 is provided with the front opening 60 in front of the emission direction 50 of the front opening 60 a of the reflecting mirror 60.
a transmission window 70 made of a material that transmits light emitted from a
have. The house 80 has a role of protecting the lamp 200 with a mirror in addition to the role of holding the lamp 200 with a mirror.

The discharge lamp 100 provided in the lamp unit 500 has an arc tube (bulb) 10 and a pair of sealing portions 20 and 20 ′ connected to the arc tube 10.
Inside the arc tube 10, there is a discharge space 15 in which a luminescent substance is sealed. In the discharge space 15, a pair of electrodes 12 and 12 'are arranged to face each other. The arc tube 10 is made of quartz glass and has a substantially spherical shape. The outer diameter of the arc tube 10 is, for example, about 5 mm to 20 mm, and the glass thickness of the arc tube 10 is, for example, about 1 mm to 5 mm.
The volume of the discharge space 15 in the arc tube 10 is, for example, 0.01
About 1 cc. In this embodiment, the outer diameter is about 13 mm, the glass thickness is about 3 mm, and the capacity of the discharge space 15 is 0.3 c.
An arc tube 10 of about c is used, and mercury is used as a luminescent substance. For example, about 150 to 200 mg / cm ³ of mercury and about 5 to 20 kPa of a rare gas (for example, argon)
And a small amount of halogen are sealed in the discharge space 15.

A pair of electrodes 12 and 1 in the discharge space 15
2 ′ is, for example, about 1 to 5 mm (preferably 1 to 3 m
m) (arc length). Electrode 1
As 2 and 12 ′, for example, a tungsten electrode (W electrode) is used. In the present embodiment, 1.5 mm
W electrodes 12 and 12 'are arranged at approximately intervals. The electrode axis (W bar) of the electrode 12 is electrically connected to the metal foil 24 in the sealing portion 20. Similarly, the electrode 12 '
Are electrically connected to the metal foil 24 in the sealing portion 20 ′.

The sealing portion 20 has a metal foil 24 electrically connected to the electrode 12 and a glass portion 22 extended from the arc tube 10. The airtightness of the discharge space 15 of the arc tube 10 is maintained by foil sealing. The glass part 22 of the sealing part 20 is made of, for example, quartz glass. The metal foil 24 is, for example, a molybdenum foil (Mo foil) and has, for example, a rectangular shape. The sealing portion 20 has, for example, a substantially circular cross-sectional shape, and the metal foil 24 is located at a substantially central portion of the sealing portion 20. The metal foil 24 in the sealing portion 20 is connected to the electrode 1 by welding.
2 and the metal foil 24 has an external lead 30 on the side opposite to the side where the electrode 12 is bonded. The external lead 30 is made of, for example, molybdenum, and is connected to the metal foil 24 at the connection portion 32 by welding. Note that the configuration of the sealing portion 20 is the same as that of the sealing portion 2.
Since the same applies to 0 ', the description is omitted. One sealing portion 20 is disposed on the side of the front opening portion 60a of the reflecting mirror 60 (on the emission direction 50 side), and the other sealing portion 2 is provided.
0 ′ is fixed to the reflecting mirror 60, and a base 55 is attached to an end of the sealing portion 20 ′. Sealing part 20 '
The reflector 60 is fixedly integrated with, for example, an inorganic adhesive (for example, cement or the like).

The reflecting mirror 60 fixed to the sealing portion 20 '
Is configured to reflect the radiated light from the discharge lamp 100 so as to be, for example, a parallel light beam, a condensed light beam converging on a predetermined minute region, or a divergent light beam diverged from the predetermined minute region. Have been. As the reflecting mirror 60,
For example, a parabolic mirror or an elliptical mirror can be used. The reflecting mirror 60 is provided with a lead wire opening 62, and the external lead wire 65 extends outside the reflecting mirror 60 through the lead wire opening 62. Reflector 6
The external lead wire 65 extended to outside of 0 is electrically connected to a terminal 84 provided in the house 80, and the terminal 84 is electrically connected to an external circuit (not shown) (for example, a lighting circuit). Will be connected. In addition, lamp 1
The base 55 of 00 is also electrically connected to the terminal 84 through the external lead wire 66.

The reflecting mirror 60 is fixed to the house 80 by a mirror holder 82. The mirror holder 82 is not particularly limited as long as it can hold the reflecting mirror 60.
For example, a structure in which the reflecting mirror 60 is fixed to the house 80 by a coupling member (a screw, a bolt, a nut, or the like) may be employed, or a structure in which the reflecting mirror 60 is fitted into the mirror holder 82 may be employed. . The reflecting mirror 60 and the mirror holder 82 may be adhered or adhered to each other, or the reflecting mirror 60 may be attached to the house 8 by magnetic force.
The configuration may be fixed to 0.

In this embodiment, in order to simplify the structure of the mirror holder 82, as shown in FIG. 2, the mirror 60 is pressed against a part of the house 80 by using the force of the band 86 to press the mirror. This constitutes a holding tool 82. FIG.
Schematically shows the reflecting mirror 60 viewed from the back.

As shown in FIG. 2, a band (for example, a wire) 86 is fixed at both ends by a band fixing member 87 and has an annular (ring-shaped) structure. Can be hooked on a band fastener (buckle) 88. Therefore, if the band 86 is set along the rear surface of the reflecting mirror 60 and the band 86 is hooked on the band fastener 88, the reflecting mirror 60 can be easily fixed to the house 80.
The mirror holder 82 shown in FIG. 2 can easily fix the lamp with mirror 200 with a simple configuration, and thus has a great advantage in assembling the lamp unit. Reflector 6
It is preferable that a claw 89 for preventing movement is provided so that the reflecting mirror 60 does not move after 0 is fixed.

Referring back to FIG. The transmission window 70 of the house 80 is made of, for example, glass or reinforced plastic. Since the transmission window 70 is provided in front of the emission direction 50 of the front opening 60 a of the reflecting mirror 60, scattered matter (eg, glass fragments or mercury) generated when the lamp is broken jumps out of the front opening 60 a of the reflecting mirror 60. In this case, it is possible to prevent flying objects from jumping out by the transmission window 70. Therefore, in the lamp unit 500 of the present embodiment, the safety of the lamp is ensured by the transmission window 70 even if the lamp with mirror 200 in which the front glass is not provided in the front opening 60a of the reflecting mirror 60 is used. . In the lamp unit 500 of the present embodiment, the temperature at the time of lamp operation of the house 80 can be lower than that of the reflecting mirror 60 of the conventional lamp 1200 with a mirror shown in FIG. An advantage is obtained that not only glass but also reinforced plastic can be suitably used. In the present embodiment, the opening is formed in the front of the house 80 located in front of the emission direction 50, and the transmission window 70 is provided so as to cover the opening from the outside of the house 80. However, the present invention is not limited to this. The transmission window 70 may be provided so as to cover the inside of the window 80. Further, the transmission window 70 is provided on a part (for example, a central part) or the whole of the front surface of the house 80 located in front of the emission direction 50.
May be provided. In this embodiment, the house 8
Since 0 is configured to have a sealed structure, even if the lamp 100 is damaged and scattered matter (a piece of glass or mercury) is generated, the scattered matter does not come out of the lamp unit 500. That is, since the structure of the house 80 has a structure capable of accommodating the flying objects so that the flying objects do not go outside, the safety of the lamp is further ensured.

The house 80 is made of, for example, a metal (for example, aluminum, stainless steel, iron, etc.). Since metal typically has good thermal conductivity, the heat dissipation of the house 80 (the lamp 200 with a mirror) can be improved. Also,
In the case of the house 80 made of metal, since the house 80 can be easily reused, there is an advantage in terms of effective use of resources. Inside 90 of house 80 in the present embodiment
Has a volume of, for example, about 800 to 2000 cm ³ . On the other hand, since the volume of the inside 61 of the reflecting mirror 60 is, for example, about 200 cm ³ , the volume of the inside 90 of the house 80 is, for example, 4 to 1 with respect to the volume of the inside 61 of the reflecting mirror 60.
It becomes possible to make it 0 times. According to the configuration of the lamp unit 100 of the present embodiment, the temperature of the interior 61 of the conventional mirror-equipped lamp 1200 is lower than the temperature of the interior 61 during lamp operation.
About 50 ° C. can be reduced. FIG.
Inside, the inside 90 of the house 80 in front of the reflecting mirror 60 and the inside 90 of the house 80 behind the reflecting mirror 60 are connected, and the air in the inside 90 of the house 80 can freely move throughout the inside of the house 80. Is possible.

In the present embodiment, the lamp unit 500 and the reflecting mirror 60 of the lamp unit 500 are configured so that the optical axes thereof are aligned with each other, so that the lamp unit 500 can be suitably used as a light source of an image projection apparatus. It is known that if the optical axis alignment is not good, an image obtained by the image projection apparatus will be poor.
Even if it is shifted, the brightness on the screen is reduced to about 60%. When the lamp unit 500 is used for a headlight of an automobile, it is only necessary to illuminate the front, so that it is not particularly necessary to perform strict optical axis alignment.

Also, by combining the lamp unit 500 with the optical system 190 (191 to 193) shown in FIG.
When configuring an image projection device, the lamp unit 500
Is configured to be a replaceable unit as a light source for an image projection apparatus, so that the lamp unit 500 can be mounted and exchanged on the image projection apparatus very easily. Further, when the lamp unit 500 is set at the lamp unit installation position in the image projection apparatus and the optical axis of the lamp unit 500 and the optical system 190 are designed to be aligned, it is only necessary to mount and replace the lamp unit 500. The optical axis alignment can be completed.

According to the present embodiment, since the lamp unit 500 includes the mirror-equipped lamp 200 of a non-closed type having no front glass at the front opening 60a of the reflecting mirror 60, the temperature becomes high during lamp operation. The air in the interior 61 of the lamp with mirror 200 can be convected (moved) not only in the interior 61 of the lamp with mirror 200 but also widely throughout the interior 90 of the house 80. Therefore, the reflecting mirror 60
Temperature rise of the mirror-equipped lamp 200 during the lamp operation can be suppressed as compared with the case of the conventional mirror-equipped lamp 1200 in which convection can only occur by the inside 61 of the lamp.
As a result, the operational reliability of the lamp can be further improved. Further, since the mirror-equipped lamp 200 can be used in a state where the temperature rise is suppressed, the life of the lamp can be extended. Further, the safety of the lamp is ensured by the house 80 having the transmission window 70. In addition, since the lamp unit 500 is a replaceable unit as a light source for the image projection device, the lamp unit 500 can be mounted and exchanged with the image projection device very easily. When the design is made in consideration of the optical axis alignment when setting the lamp unit 500, the lamp unit 500
It is also possible to complete the optical axis alignment simply by attaching and replacing.

In the lamp unit 500 of this embodiment,
Although the house 80 having a closed structure is used, as shown in FIG. 3, if the structure is such that the scattered material of the lamp 100 can be accommodated so that the scattered material of the lamp 100 does not go outside when the lamp scatters, It is also possible to use a house 80 in which 81 is formed. In the lamp unit 600 shown in FIG. 3, a lid portion 81 a that covers the upper portion of the opening 81 is formed in the house 80 so that flying objects do not go outside through the opening 81.

The lid 81a is formed so as to provide a gap between the lid 81a and the outer wall of the house 80.
The air in the interior 90 can be exchanged with outside air through the opening 81 and the gap between the lid 81a and the house 80. Therefore, even if the temperature of the air in the interior 90 of the house 80 rises as a result of the air in the interior 61 of the mirror-equipped lamp 200 becoming hot during lamp operation, the air can be exchanged with the outside air through the opening 81. It is. For this reason, the temperature rise of the lamp with mirror 200 can be further suppressed. Since the high-temperature air moves upward in the vertical direction by convection, in order to efficiently exchange the air inside 90 of the house 80 with the outside air, an opening 81 is provided at least in a vertically upper portion of the house 80. Preferably.

It is sufficient that at least one opening 81 is formed. However, in order to increase the efficiency of air exchange inside and outside the house 80, it is preferable to form a plurality of openings 81. When the opening 81 is formed on the lower surface and / or the side surface in addition to the upper surface of the house 80, the configuration can be such that the opening 81 is provided at the lowest temperature portion and the highest temperature portion. Good convection,
As a result, the air inside 90 can be more effectively replaced.

In the lamp unit 600, the lid 81a is provided at the opening 81 of the house 80 in order to have a structure capable of storing the scattered matter so that the scattered matter does not go outside.
The structure of the house 80 is not particularly limited as long as the structure can accommodate flying objects. For example, a net or the like for preventing flying objects from going outside may be provided. (Embodiment 2) Lamp unit 500 of Embodiment 1
As shown in FIG. 4, the base 55 of the lamp 100 is used to further reduce the temperature rise of the lamp 200 with a mirror.
It is also possible to adopt a configuration of the lamp unit 700 in which the heat sink 56 is provided. FIG. 4 schematically shows a configuration of the lamp unit 700 of the present embodiment.

The heat sink 56 attached to the lamp 100 of the lamp unit 700 is thermally coupled to the lamp 100 and has a function of suppressing an increase in the temperature of the lamp by increasing the surface area. The heat sink 56 is, for example, a fin for heat dissipation, and is made of a material having a good thermal conductivity (for example, a metal material such as Al and Cu). By providing the heat sink 56, it is possible to more effectively suppress the temperature rise of the mirror-equipped lamp 200 during the lamp operation. Even when the heat sink 56 is provided, it is also possible to provide an opening 81 for exchanging the air inside 90 of the house 80 with the outside air, like the lamp unit 600 shown in FIG.

When it is desired to more effectively suppress the temperature rise of the lamp with mirror 200, as shown in FIG. 5, a cooling convection device 95 is provided in the house 80 of the lamp unit 500 of the first embodiment. Lamp unit 8 provided
A configuration of 00 is also possible. Convection device for cooling 9
Reference numeral 5 denotes, for example, a cooling fan for forcibly convection the air inside the house 80. The cooling convection device 95 includes:
For example, it is connected to the house 80 through a pipe 92, and the air inside 90 of the house 80 is cooled by the convection device 9 for cooling.
5 forces convection and cooling. As a result, the temperature rise of the mirror-equipped lamp 200 can be more effectively suppressed. Lamp unit 80
0 indicates that the conventional lamp 1 with mirror at the time of lamp operation
It becomes possible to lower the temperature of the inside 61 of the 200 by about 50 ° C. to about 100 ° C. In FIG. 5, the pipe 92
Is a single configuration, but the delivery pipe and the suction pipe may be configured separately. In addition,
Since the cooling convection device 95 has a function of forcibly convectionly cooling the air inside the house 80 and cooling it, any one of the lamp units 600 and 700 may be used.
It is also possible to attach to.

In addition to the cooling by the cooling fan,
A configuration in which a cooler is provided in the cooling convection device 95 to directly cool the gas temperature is also suitable for suppressing a rise in the temperature of the mirror-equipped lamp 200. House 80
It is also possible to use, for example, an inert gas (such as N ₂ ) in place of the air in the interior 90 of the device. In addition, house 80
A pipe 92 connected to a convection device 95 for cooling is arranged on the back surface of the reflecting mirror 60 of the lamp 200 with a mirror for the purpose of directly lowering the temperature of the lamp 200 with a mirror. It is also possible to make a refrigerant (for example, water) flow through the pipe 92.
That is, it is possible to forcibly lower the temperature of the mirror-equipped lamp 200 by the method of flowing the refrigerant. It is considered that such a technique of forcibly suppressing a rise in the temperature of the lamp with a mirror functions more effectively in a lamp with a mirror whose wattage has been increasingly increased. (Other Embodiments) According to the lamp unit of the above embodiment, since the temperature inside the lamp with the mirror can be made lower than in the case of the conventional configuration, the sealing portion 20 which also plays a role of radiating the heat of the lamp 100 is provided. It is possible to make the length of the metal foil 24 in the inside shorter than the conventional configuration. As a result, the lamp 100 can be further reduced in size, so that it is also possible to provide a lamp unit including the mirrored lamp 200 that has been reduced in size. Also,
Since the temperature inside the lamp with the mirror during the operation of the lamp can be reduced as compared with the conventional case, there is a possibility that the metal foil can be suitably formed using a material other than molybdenum.

In the above-described embodiment, the non-closed type lamp with mirror 200 having no front glass at the front opening 60a of the reflecting mirror 60 has been described as an example.
As shown in FIG. 6, the front glass 17 is
0, a non-closed lamp 20 with a mirror having a configuration in which an opening (notch) 60c through which air enters and exits is provided in a part of the reflecting mirror 60.
0 'can also be used. In the case of the configuration shown in FIG. 6, the opening 60 c is provided at a position farthest from the arc tube 10 of the lamp 100 and does not significantly reduce the light reflection efficiency. Are formed in a plurality of portions. In the case of the lamp unit 900 having the configuration shown in FIG. 6, the transmission window 70 of the house 80 and the front glass 170 of the lamp with mirror 200 substantially make the front glass two sheets, so that the effect of preventing scattering in the forward direction is obtained. Can be bigger.

In the above embodiment, a mercury lamp using mercury as a luminescent substance has been described as an example of a discharge lamp. However, the present invention has a structure in which a sealing portion (sealing portion) is used to keep the arc tube airtight. The present invention is also applicable to discharge lamps. For example, the present invention can be applied to a discharge lamp such as a metal halide lamp in which a metal halide is sealed.

In the above embodiment, the mercury vapor pressure is 2
The case of about 0 MPa (so-called super high pressure mercury lamp) has been described, but the present invention is also applicable to a high pressure mercury lamp having a mercury vapor pressure of about 1 MPa or a low pressure mercury lamp having a mercury vapor pressure of about 1 kPa. The interval (arc length) between the pair of electrodes 12 and 12 'may be a short arc type or may be a longer interval. The discharge lamp of the above embodiment can be used in any of an AC lighting type and a DC lighting type.

The lamp unit in the above embodiment is
For example, it can be suitably used as a light source for a projector, and can also be used as a light source for an ultraviolet stepper, a light source for a sports stadium, a light source for a headlight of a car, a floodlight for illuminating a road sign, and the like. .

[0055]

According to the lamp unit of the present invention, it is possible to suppress a rise in the temperature of the mirror-equipped lamp during lamp operation. As a result, a lamp unit with improved lamp operation reliability can be provided. Also, since the temperature rise of the lamp with mirror can be suppressed,
It is possible to provide a lamp unit having a longer lamp life (lamp life: for example, 5,000 hours to 10,000 hours).

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a configuration of a lamp unit 500.

FIG. 2 is a view of the reflecting mirror 60 of the lamp unit 500 as viewed from the back.

FIG. 3 is a cross-sectional view schematically showing a configuration of a lamp unit 600.

FIG. 4 is a sectional view schematically showing a configuration of a lamp unit 700.

FIG. 5 is a sectional view schematically showing a configuration of a lamp unit 800.

FIG. 6 is a cross-sectional view schematically showing a configuration of a lamp unit 900.

FIG. 7 is a diagram schematically showing a configuration of a conventional lamp 1200 with a mirror.

8A is a diagram schematically illustrating a configuration of an image projection apparatus including a conventional lamp unit 1500 and an optical system 190, and FIG. 8B is a schematic diagram illustrating a configuration of a conventional lamp house 180. FIG.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 arc tube 12, 12 ′ electrode (W electrode) 15 discharge space (inside tube) 20, 20 ′ sealing portion 22 glass portion 24 metal foil (Mo foil) 30 external lead 55 base 60 reflecting mirror 62 lead wire opening 65 External lead-out lead wire 70 Transmission window 80 House (housing) 81 Opening 81a Lid 82 Mirror holder 84 Terminal 86 Band (wire) 87 Band fixture 88 Band fastener (buckle) 89 Claw for preventing movement 95 Cooling convection Apparatus 100 Discharge lamp 110 Arc tube 112, 112 'Electrode (W electrode) 115 Discharge space (in tube) 120, 120' Sealing part 122 Glass part 124 Metal foil (Mo foil) 130 External lead 155 Base 170 Front glass 180 Lamp house 190 Optical system 191 Lens 192 Image display element 193 Projection lens 200 M Lamp with collar 500, 600, 700, 800, 900 Lamp unit 1000 Discharge lamp 1200 Lamp with mirror 1500 Lamp unit

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 21, 2001 (2001.11.
21)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Wherein said house further comprises a cooling flow unit, a lamp unit according to any one of claims 1 to 3.

Wherein said transmission window is composed of a glass or reinforced plastic, the lamp unit according to any one of claims 1 to 4.

Wherein said house is composed of a metal, the lamp unit according to any one of claims 1 to 5.

Wherein said lamp unit, the discharge lamp and an image projection apparatus for a lamp unit which combines optical axes of the said reflector, the lamp unit according to any one of claims 1 to 6.

Wherein said lamp unit, the image is constructed as an exchangeable unit as a projection device for the light source lamp unit according to claim 7.

A lamp unit according to any one of 9. claims 1 to 8, and an optical system for a light source the lamp unit, a discharge lamp included in the lamp unit, said lamp unit, An image projection device, wherein the optical axis of the optical system is aligned with the optical system.

Wherein said lamp unit, the image is constructed as an exchangeable unit as a projection device for a light source, the optical system includes a <br/> image display device is a digital micromirror device, a lens, a The image projection device according to claim 9, comprising at least:

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) F21V 29/00 G03B 21/16 G03B 21/00 H01J 61 / 52B F21Y 101: 00 21/14 F21M 1 / 00R 21/16 7/00 G H01J 61/52 J // F21Y 101: 00 (72) Inventor Makoto Kai 1006 Ojidoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Tomoyuki Seki Osaka 1006 Kadoma Kadoma Matsushita Electric Industrial Co., Ltd. (72) Inventor Mamoru Takeda 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Inside Sangyo Co., Ltd. (72) Inventor Kenichi Sasaki 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 3K014 LA01 LB03 LB0 4 MA03 MA05 MA08 3K042 AA01 AB02 AB03 AB04 AC06 BA08 BB03 BB05 BC01 CA00 CC05 5C039 AA02

Claims (12)

[Claims] 1. A lamp with a mirror, and a house for holding the lamp with a mirror, wherein the lamp with a mirror has an arc tube in which a pair of electrodes are arranged opposite to each other in a tube in which a luminescent substance is sealed. A discharge lamp having a pair of sealing portions for sealing each of a pair of metal foils electrically connected to each of the pair of electrodes; and a reflecting mirror for reflecting light emitted from the discharge lamp. And a reflector having a front opening for emitting reflected light, wherein the lamp with the mirror is formed in a non-enclosed structure, and the house is the front surface of the reflector. A lamp unit having a transmission window made of a material that transmits light emitted from the front opening, in front of the opening in the emission direction. 2. The lamp unit according to claim 1, wherein the mirror-equipped lamp has an unsealed structure in which the front opening of the reflector is left open. 3. The lamp unit according to claim 1, wherein the house has a structure capable of accommodating a scattered object so that the scattered object when the discharge lamp is scattered does not go outside. 4. The lamp unit according to claim 1, wherein the house has an opening for exchanging gas between the inside and the outside of the house. 5. The house has a closed structure.
The lamp unit according to claim 3. 6. The lamp unit according to claim 5, wherein the house further includes a convection device for cooling. 7. The lamp unit according to claim 1, wherein the transmission window is made of glass or reinforced plastic. 8. The lamp unit according to claim 1, wherein the house is made of metal. 9. The lamp unit according to claim 1, wherein the lamp unit is a lamp unit for an image projection apparatus in which the optical axes of the discharge lamp and the reflecting mirror are aligned. 10. The lamp unit according to claim 9, wherein the lamp unit is configured as a replaceable unit as a light source for an image projection device. 11. A discharge lamp, comprising: the lamp unit according to claim 1; and an optical system using the lamp unit as a light source, the discharge lamp included in the lamp unit, and the lamp unit. An image projection device, wherein the optical axis of the optical system is aligned with the optical system. 12. The lamp unit is configured as a replaceable unit as a light source for an image projection device. The optical system includes an image display element selected from the group consisting of a digital micromirror device and a liquid crystal display element. The image projection device according to claim 11, comprising at least: a lens;