JP2001067902A - Illuminating device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illuminating device and a projector which can restrain a temperature raise in a reflection mirror caused by a discharge lamp, and which prevent decrease of a service life of the discharge lamp. SOLUTION: A sealing part 6 of a discharge lamp 2 is fitted in an aperture edge 11 of a cap 9 for making an outer lead 8 of the discharge lamp 2 pass through a bottom part 12 of the cap 9 and a cap pin 16. The cap 9 is fixed to a reflection mirror 18 for making a cap body 13 of the cap 9 pass through a center supporting hole 21 of the reflection mirror 18. The temperature of the reflection mirror 18 is raised by lighting the discharge lamp 2. Heat in the reflection mirror 18 is radiated to the outside by heat conduction from a bent part 15 that is exposed to the reflection mirror 18 via the cap body 13. A temperature raise in the reflection mirror 18 caused by the discharge lamp 2 is retrained so as to prevent a decrease in the service life of the discharge lamp 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination device for irradiating light from a discharge lamp and a projector device.

[0002]

2. Description of the Related Art A conventional illuminating device for irradiating light from a discharge lamp is described, for example, in Japanese Utility Model Laid-Open No. 2-31010. Then, the actual Japanese Utility Model Application No. 2-31010
In the lighting device described in the publication, the base into which the sealing portion of the discharge lamp is inserted is formed into a shape including a large diameter portion and a step having a small diameter portion smaller than the large diameter portion. Also,
The base is inserted from the inside of the reflecting mirror into an annular plate attached to a central support hole on the base end side of the reflecting mirror formed into a concave shape. Furthermore, when the base is attached to the center support hole of the reflector, the center support hole of the reflector is arranged upward, and an adhesive or the like is poured into the center support hole of the reflector. The support hole, the annular plate, and the large-diameter portion of the base do not allow the adhesive to flow downward, thereby facilitating the work of attaching the discharge lamp to the reflecting mirror at an appropriate position.

[0003]

However, the lighting device described in Japanese Utility Model Laid-Open No. 2-31010 has a stepped base having a large diameter portion in order to facilitate the work of attaching the base to the reflector. It is just being done.

In particular, when the opening of the reflecting mirror is closed by a light transmitting plate, the heat generated by the discharge lamp is hardly radiated to the outside. For this reason, this heat is shielded in the reflecting mirror, and the life of the discharge lamp is reduced.

Further, when the discharge lamp is turned on, the surface temperature of the discharge lamp becomes about 950 ° C. to 1050 ° C., and the temperature in the reflecting mirror becomes about 300 ° C. to 500 ° C. Therefore, when the opening of the reflecting mirror is more closed than when the opening of the reflecting mirror is opened, the temperature in the reflecting mirror increases by about 50 ° C. to 200 ° C. I will. For this reason, in order to lower the temperature inside the reflector, it is conceivable to apply cold air to the outer surface of the reflector,
There is a problem that it is difficult to efficiently lower the temperature in the reflecting mirror.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an illumination device and a projector device that can suppress a rise in the temperature inside a reflector when a discharge lamp is turned on and that hardly shorten the life of the discharge lamp. With the goal.

[0007]

According to a first aspect of the present invention, there is provided a lighting device comprising a bulb, a substantially cylindrical sealing portion extending from the bulb, and an outer lead extending from the sealing portion. A lamp; an opening edge formed at the distal end; and a base body formed into a bottomed substantially cylindrical shape having a base closed and having a bottom through which an outer lead penetrates, and a sealing portion inserted therein, and an opening of the base body A plurality of cut portions cut in the direction having at least the axial component from the edge, a bent portion in which each opening edge between these cut portions is bent outward, and a bottom portion of the base body A base provided with a base pin projected and through which an outer lead penetrates; a concave mirror body which is positioned optically opposite to the discharge lamp when the base with the discharge lamp is mounted; Opened to the side Those equipped with; mouth, and the base body of the mirror is formed on the base end side of the body cap and a reflector having a central support hole to be fixed in a state of penetrating.

The outer lead of the discharge lamp is penetrated through the bottom of the base of the base of the base, and the sealing part of the discharge lamp is inserted into the base of the base. And fix it in a state where it penetrates.
At this time, the discharge lamp is provided in the reflector, and the bent portion of the base is provided in the center support hole side of the reflector. When electric power is supplied to the discharge lamp via the base, the discharge lamp emits light, and the light emission of the discharge lamp causes the discharge lamp to generate heat, so that the temperature inside the reflector increases rapidly. At this time, by collecting heat at the bent portion of the base, the temperature of the bent portion rises, and the heat collected at the bent portion is conducted to the base pin of the base. Therefore, the temperature in the reflector is radiated to the outside through the base. For this reason, an excessive rise in the temperature in the reflecting mirror due to the discharge lamp is suppressed, and a reduction in the life of the discharge lamp is prevented.

A lighting device according to a second aspect of the present invention is the lighting device according to the first aspect, wherein the lighting device is attached to an opening of a reflecting mirror.
A light-transmitting plate for closing the opening and transmitting light from the discharge lamp is provided.

When a light-transmitting plate is attached to the opening of the reflecting mirror and the opening is closed, the temperature inside the reflecting mirror is more likely to rise due to heat generated by the discharge lamp. At this time, the heat generated in the reflecting mirror is conducted from the bent portion of the base to the base pin of the base and radiated to the outside. Therefore, when the discharge lamp is turned on, the temperature rise in the reflecting mirror due to the heat generated from the discharge lamp is suppressed. Therefore, even when the reflecting mirror is closed by the light transmitting plate, the life of the discharge lamp is prevented from being shortened.

According to a third aspect of the present invention, there is provided the illuminating device according to the first or second aspect, further comprising a heat radiating plate attached to the base pin of the base and radiating heat generated by the discharge lamp to the outside.

The sealing portion of the discharge lamp is inserted and inserted in a state where the outer lead of the discharge lamp penetrates the bottom, and the base body is fixed to the center support hole of the reflector in a state of penetrating. Attach the heat sink to the base pin of the base. Further, when power is supplied to the discharge lamp via the base, heat generated when the discharge lamp is turned on is collected at the bent portion of the base, and this heat is transmitted from the bent portion to the radiator plate via the base pin of the base. . Therefore, by attaching the heat radiating plate to the base pin of the base, the temperature rise in the reflecting mirror due to the discharge lamp is more efficiently suppressed. For this reason, the life of the discharge lamp is prevented from being reduced more efficiently.

[0013] According to a fourth aspect of the present invention, there is provided a projector device comprising: the illumination device according to any one of the first to third aspects; and a light-transmitting property for transmitting illumination from the illumination device according to the first or the third aspect. A display device for forming an image, and a projection device for projecting light from a lighting device via the display device;
It is provided with.

A display device is provided at a position where light from the lighting device according to any one of claims 1 to 3 is transmitted, and a light is projected at a position where light from the lighting device is projected via the display device. When the discharge lamp is turned on in the reflector of the lighting device when the means is provided, heat generated when the discharge lamp is turned on is transferred from the bent portion of the base of the lighting device to the connection portion of the base. I do. Therefore, heat generated by lighting the discharge lamp radiates heat to the outside of the lighting device. Therefore, a rise in the temperature inside the reflecting mirror due to the discharge lamp of the lighting device is suppressed. For this reason, the life of the discharge lamp is prevented from being shortened, and the reliability of the projector device to which the lighting device is attached is improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of the illumination device with a part cut away, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is an explanatory view of a projector device to which the illumination device is attached.

In FIGS. 1 and 2, reference numeral 1 denotes an illuminating device. The illuminating device 1 has a short arc lamp or a rare earth metal halide and has excellent color rendering properties.
In addition, a discharge lamp 2 including only an arc tube is provided inside without using an outer tube such as a short arc metal halide lamp having high luminous efficiency.

The discharge lamp 2 has a bulb 3 in which an airtight discharge space 4 is formed. An electrode 5 having a pair of anodes 5a and cathodes 5b is provided inside the discharge space 4 at positions facing each other. Further, substantially cylindrical sealing portions 6 are respectively extended at positions facing each other of the bulb 3, that is, at positions where the anode 5a and the cathode 5b are provided. Inner leads 7 respectively connected to the anode 5a and the cathode 5b are coaxially sealed in these sealing portions 6.

Outer leads 8 are led out from the inner leads 7 to the sealing portions 6, respectively. Further, the sealing portion 6 on the cathode 5b side of the discharge lamp 2
The base 9 is provided with a base 9 for electrically connecting the outer lead 8 led out from the sealing portion 6 and positioning and fixing the discharge lamp 2. Further, a power supply line 10 for supplying power to the discharge lamp 2 is fixed to an outer lead 8 led out from the sealing portion 6 on the anode 5a side of the discharge lamp 2.

The base 9 is made of a material having excellent conductivity and heat conductivity such as a metal, and is formed into a bottomed cylindrical shape having a height of 16 mm and an inner diameter of 6.2 mm, for example. 9 includes a base body 13 having an opening edge 11 formed at the distal end and a bottom 12 having a closed base end. The base body 13 has a sealing portion 6 on the cathode 5b side of the discharge lamp 2 inserted from the opening edge 11 toward the inside, and is bonded and fixed with an adhesive such as alumina cement, for example. The outer lead 8 led out to the sealing portion 6 on the side penetrates a substantially central portion of the bottom portion 12.

In the opening edge 11 of the base body 13, a plurality of cut portions 14 cut, for example, by about 13 mm from the opening edge 11 in the axial direction are provided at positions equidistant from each other, for example. The book is formed. In each of the opening edges 11 between the cuts 14, these opening edges 11, that is, for example, a heat collecting plate that is bent 90 degrees toward the outside, that is, a position of 3 mm from the opening edge 11 in the radial direction. Multiple bends 15
However, for example, eight sheets are formed.

Furthermore, a base pin 16 through which the outer lead 8 of the discharge lamp 2 on the cathode 5b side penetrates is provided in a substantially central part of the bottom part 12 of the base body 13. A notch 17 is formed at the tip of the base pin 16 for firmly resistance welding the outer lead 8 on the cathode 5b side of the discharge lamp 2 penetrating through the base of the base pin 16. The base body 13 is attached to a reflecting mirror 18 for reflecting light from the discharge lamp 2 in a certain direction.

The reflecting mirror 18 is formed using glass as a base, and a metal-deposited multilayer film is attached as a reflecting material over substantially the entire inner surface of the base. In addition, reflecting mirror 18
The concave surface which is optically opposed to the discharge lamp 2 when the sealing portion 6 on the cathode 5b side of the discharge lamp 2 is inserted from the opening edge 11 and the base 9 fitted and fixed inside is attached. It has a mirror-shaped main body 19.

The mirror main body 19 is formed so as to have a multidimensional function surface such as a spherical surface, a paraboloid, or an ellipsoid, or a reflecting surface obtained by combining them. An opening 20 having an enlarged diameter at the distal end side is opened at the distal end side of the mirror main body 19. At the base end side of the mirror body 19, a center support hole 21 is formed with the base body 13 of the base 9 being fixed therethrough and fixed with an adhesive such as alumina cement.

Here, when the base 9 is attached to the sealing portion 6 on the cathode 5b side of the discharge lamp 2 and the base 9 is attached to the central support hole 21 of the reflecting mirror 18, the bulb 3 of the discharge lamp 2 The reflecting mirror 18 is configured to be disposed at the focal position of the mirror body 19. Furthermore, when the discharge lamp 2 is fixed to the central support hole 21 of the reflecting mirror 18 via the base 9, the direction of the optical axis of the reflecting mirror 18 and the center of the positive column of the discharging lamp 2 coincide. The optical axis is arranged.

The surface area (A) of the bent portion 15 of the base 9 is smaller than 1.5 times the cross-sectional area (B) of the central support hole 21 of the reflecting mirror 18, that is, (A) <
The relationship (B × 1.5) is established. Further, when the base 9 is attached to the center support hole 21 of the reflecting mirror 18, the bent portion 15 of the base 9 is
A power supply line 10 for supplying power to the discharge lamp 2 is screwed and fixed to a base pin 16 of the base 9.

A substantially flat light-transmitting plate 22 for closing the opening 20 and transmitting light from the discharge lamp 2 is provided in the opening 20 of the reflecting mirror 18 with an adhesive such as a heat-resistant silicon adhesive. It is fixed by bonding. The light transmitting plate 22 is formed of a material that transmits light, such as so-called glass.

A heat radiating plate 23 for radiating heat generated by the discharge lamp 2 to the outside is attached to the base pin 16 of the base 9. The heat radiating plate 23 is formed of a material having excellent thermal conductivity in a flat disk shape, and a central portion of the base pin 16 is provided with a screw which can be screwed to a base end side of the base pin 16. A hole 24 is opened.

Further, the illumination device 1 uses, for example, a so-called liquid crystal projector, which uses a high-resolution liquid crystal panel as an image device and projects the image on a screen in combination with an optical system and enjoys an image by displaying data at a conference or a video movie. Or a short arc lamp device used as a light source such as a fiber illuminator.

As shown in FIG. 3, the illuminating device 1 is provided at a position where the illumination from the discharge lamp 2 of the illuminating device 1 is transmitted, for example, a display device 25 such as a high-resolution liquid crystal panel.
Are arranged. In addition, at a position where the light from the illumination device 1 is projected through the display device 25, a projection device for projecting an image or the like by the display device 25 on a screen or the like, for example.
26 are arranged. Then, the lighting device 1 and the display device 25
The projection device 26 constitutes a projector device 27.

Here, the assembling operation of the lighting device 1 will be described.

The outer lead 8 extending from the sealing portion 6 on the cathode 5b side of the discharge lamp 2 is inserted into the opening edge 11 of the base 9, and the base pin 16 of the base 9 is inserted. The sealing portion 6 on the side of the cathode 5b is inserted into the base body 13 of the base 9.

Then, a stress is evenly applied to each cut portion 14 of the base 9 from the outside, and the shape of the base body 13 of the base 9 matches the shape of the sealing portion 6 of the discharge lamp 2 on the cathode 5b side.
At this time, the axial direction of the sealing portion 6 on the cathode 5b side of the discharge lamp 2 and the base 9 coincide with each other due to the spring function of the base 9 of the base 9.

Next, the notch 17 of the base pin 16 of the base 9 is resistance-welded, and the notch 17 is electrically connected to the outer lead 8 inserted through the base pin 16.

Then, the discharge lamp 2 having the base 9 attached thereto is inserted into the opening 20 of the reflector 18, and the base 9 attached to the discharge lamp 2 is inserted into the center support hole 21 of the reflector 18 from inside. insert.

Next, the discharge lamp 2 is turned on, and the mounting position of the discharge lamp 2 with respect to the reflecting mirror 18 is determined so as to show a specified characteristic value on a screen surface (not shown).

Further, the discharge lamp 2 is turned off, and the base 9 is turned off.
So that the bent portion 15 is exposed inside the mirror body 19 of the reflecting mirror 18,
A fixed amount of an adhesive such as alumina cement is injected into a gap between the central support hole 21 of the reflector 18 and the base body 13 of the base 9, and the alumina cement is dried and solidified by heating from the surroundings.
The base 9 is fixed to the reflecting mirror 18.

Then, the power supply line 10 is fixed to the outer lead 8 led out from the sealing portion 6 on the side of the anode 5a of the discharge lamp 2 mounted in the reflecting mirror 18, and the heat-resistant silicon adhesive is used. A light transmitting plate 22 is bonded and fixed to the opening 20 of the reflecting mirror 18, and the inside of the reflecting mirror 18 is sealed by the light transmitting plate 22.

Thereafter, a heat radiating plate 23 is screwed and attached to the base pin 16 of the base 9 projecting from the central support hole 21 of the reflecting mirror 18, and the power supply line 10 is connected to the tip side of the base pin 16.

Further, when electric power is supplied to the discharge lamp 2 in the lighting apparatus 1 of the above-described embodiment and the discharge lamp 2 is turned on, the upper outer surface temperature of the bulb 3 of the discharge lamp 2 is 900 ° C. At the same time, the temperature inside the reflecting mirror 18 was 350 ° C. In addition, when the measurement was performed on a comparative example in which the bent portion 15 was not formed, the temperature of the upper outer surface of the bulb 3 of the discharge lamp 2 was 1050 ° C., and the temperature inside the reflecting mirror 18 was 500 ° C.

Therefore, when the discharge lamp 2 attached to the base 9 fixed to the central support hole 21 of the reflector 18 is turned on, the heat generated by the lighting of the discharge lamp 2 causes the reflector 18 to emit heat.
Although the temperature inside increases, the heat sink 23 attached to the reflector 18
By cooling the heat sink, the heat radiating plate 23 is cooled and the bent portion 15 of the base 9 is cooled via the base body 13 of the base 9, so that the temperature rise in the reflecting mirror 18 due to the heat generated by the discharge lamp 2 is suppressed. it can.

For this reason, damage to the discharge lamp 2 and the like caused by lighting the discharge lamp 2 can be prevented, so that the main body of the lighting device 1 can be easily protected, and further, the life of the discharge lamp 2 can be prevented from being shortened. .

Further, since the life of the discharge lamp 2 can be prevented from being shortened, the discharge lamp 2 can be used for a longer period of time as compared with the conventional lamp, so that the reliability of the main body of the lighting apparatus 1 can be improved and the user can be improved. Usability can be improved.

Then, the opening edge 11 of the base 9 is bent outward to form a bent portion 15.
In this configuration, heat is transmitted to the heat radiating plate 23 via the heat sink and the temperature rise in the reflecting mirror 18 can be suppressed, so that the structure is simplified and the main body of the lighting device 1 can be made compact.

When the illuminating device 1 is used for the projector device 27, the usability of the illuminating device 1 is improved, so that the same effect as the illuminating device 1 can be obtained even with the projector device 27.

When the discharge lamp 2 is turned on,
The cathode 5b of the discharge lamp 2 generates more heat than the anode 5a of the discharge lamp 2. For this reason, by attaching the base 9 to a position close to the cathode 5b of the discharge lamp 2, that is, to the sealing portion 6 on the cathode 5b side of the discharge lamp 2, the temperature rise in the reflecting mirror 18 when the discharge lamp 2 is turned on can be efficiently performed. Can be suppressed well.

In the above embodiment, the illumination device 1 used in the projector device 27 has been described.
It is not limited to the lighting device 1 used only for the projector device 27, and any device that requires illumination can be used.

The heat radiating plate 23 is formed in a flat disk shape from a material having excellent thermal conductivity. However, the present invention is not limited to such a configuration. Accordingly, any configuration may be used as long as the temperature rise in the reflecting mirror 18 that occurs when the discharge lamp 2 is turned on can be suppressed. For example, the heat sink 23 may be formed in a flat rectangular shape.

Further, although the base 9 is attached to the sealing portion 6 on the cathode 5b side of the discharge lamp 2, the present invention is not limited to such a structure, and the sealing portion 6 on the anode 5a side of the discharge lamp 2 is provided. A base 9 can be attached to 6.

[0050]

According to the lighting apparatus of the first aspect, when power is supplied to the discharge lamp through the base, the discharge lamp emits light, and the light emitted by the discharge lamp generates heat. Temperature rises sharply, but at this time, the heat rises at the bent part of the base, the temperature of the bent part rises, and heat is conducted from this bent part to the base pin of the base, so the inside of the reflecting mirror The temperature is radiated to the outside via the base, so that an excessive rise in temperature in the reflector caused by the discharge lamp can be suppressed, the life of the discharge lamp can be prevented from being shortened, and the usability of the user can be improved.

According to the illumination device of the second aspect, in addition to the effect of the illumination device of the first aspect, even if the reflection mirror is closed by the light transmitting plate, heat in the reflection mirror is reduced. Since the heat is conducted from the bent portion of the base to the base pin of the base and radiated to the outside, it is possible to suppress a rise in the temperature inside the reflector when the discharge lamp is turned on.

According to the lighting device of the third aspect, in addition to the effects of the lighting device of the first or second aspect, when power is supplied to the discharge lamp through the base, heat generated when the discharge lamp is turned on is generated by the base. Heat is collected at the bent part, and this heat is conducted from the bent part to the radiator plate via the base pin of the base. Can be suppressed more efficiently, and the life of the discharge lamp can be prevented from being reduced more efficiently.

According to a fourth aspect of the present invention, a display device is provided at a position where the illumination from the illumination device according to any one of the first to third aspects is transmitted, and the illumination device via the display device is provided. When the projection means is disposed at a position where the light from the light source is projected, the heat generated when the discharge lamp provided in the reflector of the lighting device is turned on is heated from the bent portion of the base of the lighting device to the base pin of the base. Since the heat is generated by turning on the discharge lamp for conduction, the heat is radiated to the outside of the lighting device. Further, the usability of the projector device to which the lighting device is attached can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a lighting device of the present invention.

FIG. 2 is a cross-sectional view of the lighting device, taken along the line II-II.

FIG. 3 is an explanatory diagram showing a projector device to which the lighting device is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Illumination device 2 Discharge lamp 3 Bulb 6 Sealing part 8 Outer lead 9 Base 11 Opening edge 12 Bottom 13 Base body 14 Cutout part 15 Bend part 16 Base pin 18 Reflecting mirror 19 Mirror body 20 Opening 21 Center support hole 22 Transparent Light plate 23 Heat sink 25 Display device 26 Projection device 27 Projector device

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G03B 21/16 H01J 61/50 C H01J 5/50 61/88 C 61/50 F21M 7/00 J 61/88 // F21Y 101: 00

Claims (4)

[Claims] 1. A discharge lamp comprising a bulb, a substantially cylindrical sealing portion extending from the bulb, and an outer lead derived from the sealing portion; an opening edge formed at a tip, and a base. A base body formed into a bottomed substantially cylindrical shape having a bottom portion whose end is closed and a bottom through which an outer lead penetrates, and a sealing portion is inserted into the base body, and cut from an opening edge of the base body in a direction having at least an axial component. A plurality of cut-out portions, a bent portion in which each opening edge between these cut-out portions is bent outward, and a base pin protruding from the bottom of the base body and penetrating the outer lead. A base; a concave mirror body which is positioned optically facing the discharge lamp when the base to which the discharge lamp is mounted is mounted; an opening which is opened at the tip end side of the mirror body; A base formed on the end side A reflecting mirror having a central support hole to which the base body is fixed while penetrating therethrough. 2. The lighting device according to claim 1, further comprising a light-transmitting plate attached to an opening of the reflecting mirror, which closes the opening and transmits light from the discharge lamp. 3. The lighting device according to claim 1, further comprising a radiator plate attached to a base pin of the base to radiate heat generated by the discharge lamp to the outside. 4. An illuminating device according to claim 1; and a display having a light-transmitting property for transmitting illumination from the illuminating device according to claim 1 and forming an image. A projector device comprising: a device; and a projection device that projects light from a lighting device via the display device.