JP2003029337A - Optical device for lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device for lamp, which enhances the cooling efficiency, reduces noise, and brings no evil upon a cooling fan in an air flow passage even if, for example, a light emission tube bursts. SOLUTION: A space 3a in a lamp unit 3 composed of a lamp 1, a reflector 2, and explosion-proof glass 5 is spatially connected to a blast fan 6 through a sealed flow passage formed of an air tube 7 and a close contact air tube 8, to enhance the cooling efficiency and noise countermeasures. Further, the close contact air tube 8 is provided with a thin wall part which breaks when the lamp 1 bursts and air and fragments are made to flow out from there at the time of the bursting to protect the blast fan.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device for a lamp of a projection display device which projects an image on a screen, and more particularly to an air cooling system thereof.

[0002]

2. Description of the Related Art FIG.
It is a block diagram which shows the principal part structure of the air cooling mechanism of the conventional optical device for lamps disclosed by the 6th publication.

In the figure, an arc tube 51 is fixed to the bottom of a reflecting mirror 52 with cement via a base 53 to form a lamp device 54. The lamp device 54 is arranged at a predetermined position in the lamp box 55, and is configured such that the emitted light is reflected by the reflecting mirror 52 and then transmitted through the front glass 56 to be output forward.

Ventilation holes 57 and 58 are formed in the side wall of the lamp box 55 connected to the edge of the reflecting mirror 52, and a cooling fan 59 is provided outside the ventilation hole 57. is set up. When the cooling fan 59 is in operation, the outside air flows in the direction of the arrow in the figure, and the arc tube 51 that emits light and generates heat is cooled by the outside air. In this case, the air circulation path is determined by the alignment of the lamp box 55 and the lamp device 54.

[0005]

According to the above configuration,
Vent hole 5 because the air circulation path is not sealed
It is difficult to apply the air flowing in from 8 to the arc tube 51 without fail. In addition, when air sufficient for cooling is supplied to compensate for this low efficiency, noise in the circulation path leaks to the outside due to the gap between the lamp box 55 and the circulation path of the air, or air turbulence due to the gap itself occurs. There is a problem that the noise becomes a source of noise and becomes loud.

Further, when the arc tube ruptures, there is a possibility that the cooling fan 59 located downstream of the flow path may be broken by the fragments of the arc tube or the impact of the rupture.

An object of the present invention is to improve cooling efficiency and reduce noise in order to solve the above problems.
An object of the present invention is to provide an optical device for a lamp that prevents damage to the cooling fan in the air circulation path even if the arc tube ruptures.

[0008]

An optical device for a lamp according to claim 1, wherein a lamp for a light source, a lamp unit formed of a reflector and an explosion-proof glass forming a space surrounding at least a light emitting portion of the lamp, and the lamp unit. And a blower fan, an air guide means for guiding the outside air sent by the blower fan, and a close contact air guide tube for spatially connecting the air guide means and the internal space of the lamp unit. It is characterized by

According to a second aspect of the present invention, there is provided an optical device for a lamp.
In the optical device for a lamp described above, the contact air guide tube,
The inner space is formed of a heat-resistant elastic member having a thin portion that breaks when the atmospheric pressure exceeds a predetermined value. The lamp optical device according to claim 3 is the optical device for lamp according to claim 1, wherein the close contact air duct opens and closes the internal space when the internal pressure reaches a predetermined value or more. It is characterized by being formed of a heat resistant elastic member having a valve.

According to a fourth aspect of the present invention, there is provided the optical device for a lamp according to the first aspect, wherein the contact air guide tube is made of a heat-resistant plastic material having an opening, and the internal space is predetermined. It is characterized by having a shutter that slides to open the opening to open the internal space when the atmospheric pressure exceeds a value. The lamp optical device according to claim 5 is the lamp optical device according to claim 4, wherein the shutter is a shutter ball, a ball mounting table on which the shutter ball is mounted, and the shutter ball is movable. And a ball retracting cylinder having an empty portion. Furthermore, an optical device for a lamp according to claim 6 is the optical device for a lamp according to any one of claims 1 to 5, wherein the air guide means has a wind guide tube whose one end is spatially connected to the blower fan. And a flow opening formed in the lamp box to which the other end of the air guide tube is fixed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. First Embodiment FIG. 1 is a configuration diagram showing a configuration of a lamp optical device 20 according to a first embodiment of the present invention.

In the figure, a lamp unit 3 includes a lamp 1 having a spherical light emitting portion 1a, a rod-shaped portion extending forward and backward from the light emitting portion 1a, and a reflector 2 for holding one end side 1b of the rod-shaped portion at its central portion. And an explosion-proof glass 5 that closes the opening of the reflector 2. The reflector 2 is
The outer shape thereof is substantially bowl-shaped, and the reflecting surface 2a, which is an inner curved surface, is configured to receive the light emitted from the light emitting portion 1a and reflect the light forward, and the opening thereof is fitted to the opening edge portion 2b. It is closed by explosion-proof glass 5.

Therefore, the lamp unit 3 includes the explosion-proof glass 5
The reflector 2 and the reflector 2 form an internal space 3a including the light emitting portion 1a of the lamp 1. Also, this internal space 3
a communicates with the outside through an air inflow opening 3b, which will be described later, formed in the lamp unit 3.

The lamp box 4, as shown in FIG.
The lamp unit 3 is housed so that the opening 4a is closed by the reflection surface 3a of the lamp unit 3 facing outward, and is held by a holding means (not shown). Further, in the lamp box 4, a circulation opening 4b spatially continuous to the blower fan 6 is formed by the air guide tube 7 at a position facing the air inflow opening 3b formed in the lamp unit 3.

Between the flow opening 4b formed in the lamp box 4 and the air inflow opening 3b formed in the lamp unit 3, a hollow close air guide tube 8 for forming a continuous flow space. Is provided. In addition, the wind guide tube 7
And the flow opening 4b formed in the lamp box 4,
It corresponds to the air guide means for guiding the outside air sent by the blower fan.

FIG. 3 is an external perspective view showing the structure of the close contact air guide tube 8.

This hollow close air guide tube 8 is formed of a heat-resistant elastic member such as silicon rubber, for example.
An upper facing portion 8 which is a tubular member having c and which is brought into pressure contact with and closely adheres to the inner wall around the flow opening 4b of the lamp box 4.
a, a lower facing portion 8b which is also pressed against and closely adheres to the outer wall around the air inlet opening 3b of the lamp unit 3, and a thin portion 8d which forms a thin side wall between these facing portions. The thin portion 8d is designed so as to be broken when a pressure equal to or higher than a predetermined value is generated in the hollow channel portion 8c.

Therefore, normally, the external air sent by the blower fan 6 (FIG. 1) is as shown by the arrow A in FIG.
The air flows into the internal space 3 a of the lamp unit 3 through the closed flow passage formed by the air guide tube 7 and the close air guide tube 8. The external air flowing into the internal space 3a cools the lamp 1 heated by the light emission of the light emitting portion 1a, and then the lamp 1
Flows out to the outside from an exhaust hole 2c formed around the holding portion of the reflector 2 that holds the one end 1b of the.

FIG. 2 is an operation explanatory view for explaining a corresponding operation of the lamp optical device 20 according to the first embodiment shown in an emergency in which the lamp 1 explodes. The contact air guide tube 8 of FIG. The vicinity is enlarged and shown.

When the lamp 1 bursts in the internal space 3a of the lamp unit 3, as shown in the figure, the atmospheric pressure in the internal space 3a rapidly rises, and the fragments of the lamp 1 and the air in the lamp flow backward in the flow passage. try to. At this time, the close contact air duct 8
The thin portion 8d (FIG. 3) is broken by the rise of the internal pressure, and the internal debris and the air flow out from here.

As described above, according to the lamp optical device 20 of the first embodiment, the external air blown by the blower fan reaches the internal space of the lamp unit through the closed flow passage to cool the lamp. As a result, the cooling efficiency is high, and noise generation due to air leakage can be suppressed. Also, in an emergency when the lamp bursts,
Since the thin portion 8d of the close contact air duct 8 is broken and the sealed state is released, it is possible to prevent the broken pieces of the lamp from flowing back to the blower fan and damaging the blower fan.

Furthermore, when the internal air pressure temporarily rises due to a sudden temperature change of the lamp 1, the thin portion 8d of the close contact air guide tube 8 bulges outward to the extent that it is not damaged, and It acts to absorb the rise in atmospheric pressure.

Embodiment 2. FIG. 4 is a configuration diagram showing the configuration of the lamp optical device 21 according to the second embodiment of the present invention.

The lamp optical device 21 according to the second embodiment.
However, the only difference from the lamp optical device 20 of the first embodiment described above is the configuration of the contact air guide tube 10. Therefore,
Parts that are the same as or equivalent to those of the lamp optical device 20 shown in FIG. 1 are assigned the same reference numerals, explanations for those common parts are omitted, and different points will be mainly described.

In FIG. 4, a hollow close air guide for forming a continuous flow space between the flow opening 4b formed in the lamp box 4 and the air inflow opening 3b formed in the lamp unit 3. A tube 10 is provided. Figure 6
FIG. 3 is an external perspective view showing the configuration of the close contact air guide tube 10.

The close contact air guide tube 10 is made of an elastic material such as silicon rubber, and the upper adhesive surface 10b forming the peripheral edge of the opening 10a has a flow opening 4 in the lamp box 4.
b so that the opening b and the opening 10a face each other.
It is attached closely to the inner wall around b. The side wall portion that is connected to the opening 10a and forms the cavity portion 10c is
It is composed of a plurality of on-off valves 10d to 10k.
Each of the on-off valves 10d to 10k has a lower end portion that widens toward the end to form a lower facing surface 10n.

In the normal state, each on-off valve 10d-10
Adjacent portions of k are stuck together to form a closed cavity 10c. Also, in this state, each on-off valve 10d to 10k
The lower facing surface 10n, which is the lower end of the lamp unit 3, is in close contact with the outer wall around the air inlet opening 3b of the lamp unit 3,
The air guide tube 7 and the close contact air guide tube 10 form a flow passage closed. Each of these on-off valves 10d-10k
Is when a pressure equal to or higher than a predetermined value is generated in the hollow portion 10c,
As shown by the dotted lines in FIG. 6, the cavity 1 is curved upwards.
0c is opened.

Therefore, normally, the external air sent by the blower fan 6 (FIG. 4) is as shown by the arrow A in FIG.
An internal space 3a of the lamp unit 3 via a closed flow passage formed by the air guide tube 7 and the close air guide tube 10.
Flow into. The external air that has flowed into the internal space 3a cools the lamp 1 that is heated by the light emission of the light emitting portion 1a, and then is discharged to the outside from the exhaust hole 2c formed around the holding portion of the reflector 2 that holds the one end 1b of the lamp 1. leak.

FIG. 5 is an operation explanatory view for explaining the corresponding operation of the lamp optical device 21 according to the second embodiment shown in an emergency when the lamp 1 bursts. The vicinity is enlarged and shown.

When the lamp 1 bursts in the internal space 3a of the lamp unit 3, as shown in the figure, the atmospheric pressure in the internal space 3a rapidly rises, and the fragments of the lamp 1 and the air in the lamp flow backward in the flow passage. try to. At this time, the close contact air duct 1
The open / close valves 10d to 10k (FIG. 6) of No. 0 are respectively curved as shown by a dotted line in FIG.
0c is opened, and internal debris and air are allowed to flow out from here.

As described above, according to the lamp optical device 21 of the second embodiment, the same effect as that of the first embodiment can be obtained, and since the close contact air guide tube 10 itself is not broken, it is reused. be able to.

Embodiment 3. FIG. 7 is a configuration diagram showing the configuration of the lamp optical device 22 according to the third embodiment of the present invention.

The lamp optical device 22 of the third embodiment.
However, the only difference from the above-described lamp optical device 20 of the first embodiment is the configuration of the contact air guide tube 12. Therefore,
Parts that are the same as or equivalent to those of the lamp optical device 20 shown in FIG. 1 are assigned the same reference numerals, explanations for those common parts are omitted, and different points will be mainly described.

In FIG. 7, a hollow close air guide for forming a continuous flow space between the flow opening 4b formed in the lamp box 4 and the air inflow opening 3b formed in the lamp unit 3. A tube 12 is provided. Figure 9
(A) is an external perspective view showing the configuration of the close contact air guide tube 12, and (b) is an outflow opening 12 shown in (a).
FIG. 12 is a partial cross-sectional view near an outflow opening 12d when a cross section including an instruction line 101 passing through the center of d is viewed in the direction of arrow D.

The close contact air guide tube 12 is a tubular member having a hollow flow path portion 12c formed of, for example, a heat-resistant plastic member, and is in close contact with the inner wall of the lamp box 4 around the flow opening 4b by pressure. The upper facing part 12a, the lower facing part 12b which is pressed against and closely adheres to the outer wall around the air inlet opening 3b of the lamp unit 3, and the side wall formed with a plurality of outlet openings 12d between the facing parts. It has a part 12e.

In each outflow opening 12d of the side wall 12e,
Shutters 12f using ball members as shown in the sectional view of FIG. 9B are formed. The shutter 12f includes a shutter ball 12g, a ball mounting table 12h for mounting the shutter ball 12g on a cylindrical half-shaped mounting surface, and a cylindrical ball having an inner space in which the shutter ball 12g can move. Evacuation tube 1
2i and.

In the normal state, the shutter ball 12
g is the ball mounting table 12 by its own weight as shown in FIG. 9 (b).
It is located on the mounting surface of h. At this time, each outflow opening 12
Since d and the hollow flow path portion 12c are closed by the shutter ball 12g, the air guide tube 7 and the close contact air guide tube 12 are closed.
Form a closed flow passage.

On the other hand, in these shutters 12f, when a pressure equal to or higher than a predetermined value is generated in the hollow flow path portion 12c, the shutter ball 12g is pushed upward against its own weight due to the wind pressure, so that FIG. As indicated by the dotted line, the inner space of the ball retracting cylinder 12i is moved upward. This allows
The outflow openings 12d and the hollow flow passages 12c are spatially connected, and the hollow flow passages 12c are opened. A vent hole 12j is formed on the outside of the ball retracting cylinder 12i for facilitating the movement of the shutter ball 12g at this time.

Therefore, normally, the external air sent by the blower fan 6 (FIG. 7) is as shown by the arrow A in FIG.
An internal space 3a of the lamp unit 3 via a closed flow passage formed by the air guide tube 7 and the close contact air guide tube 12
Flow into. The external air that has flowed into the internal space 3a cools the lamp 1 that is heated by the light emission of the light emitting portion 1a, and then is discharged to the outside from the exhaust hole 2c formed around the holding portion of the reflector 2 that holds the one end 1b of the lamp 1. leak.

FIG. 8 is an operation explanatory view for explaining the corresponding operation of the lamp optical device 22 of the third embodiment shown in an emergency when the lamp 1 bursts. The vicinity is enlarged and shown.

When the lamp 1 bursts in the internal space 3a of the lamp unit 3, as shown in the figure, the atmospheric pressure in the internal space 3a rapidly rises, and the fragments of the lamp 1 and the air in the lamp flow backward in the flow passage. try to. At this time, the close contact air duct 1
The shutter ball 12g of the shutter 12f of each of the outflow openings 12d of No. 2 moves upward as shown by the dotted line in FIG.
Open and allow internal debris and air to flow out of here.

As described above, according to the lamp optical device 22 of the third embodiment, as in the case of the second embodiment, the same effect as that of the first embodiment can be obtained, and the contact air guide tube 1 can be obtained.
2 itself does not break and can be reused.

The graph of FIG. 10 is a graph showing the results of comparing the noise around the lamp optical device with and without the closed air guide tube of each of the above-described embodiments. . As shown in the figure, it is understood that the noise due to the ventilation is improved when the closed air guide tube is installed.

Similarly, the graph of FIG. 11 is a graph showing the results of comparing the cooling effect of the light emitting portion of the lamp 1 with and without the closed air guide tube of each of the above-described embodiments. It is a thing. As shown in the figure, it is understood that the temperature of the lamp 1 is lowered and the cooling efficiency is improved when the closed air guide tube is mounted.

Although the air guide tube is fixed to the lamp box and the close air guide tube is arranged between the lamp box and the lamp unit in the above embodiment, the present invention is not limited to this. Instead, for example, the contact air guide tube may be directly attached to the air guide tube.

Further, in the third embodiment, the shutter ball is adopted as the shutter, but the shutter ball is not limited to this, and various modes such as a member having the same action and effect may be adopted instead. It is possible.

Further, in the above description of the embodiments, the terms "upper", "lower", "front", "rear" are used, but these are for convenience, and the optical device for the lamp is arranged. It does not limit the absolute positional relationship in the state.

[0048]

According to the optical device for a lamp of claim 1,
The external air sent by the blower fan reaches the internal space of the lamp unit through the sealed flow passage and can cool the lamp, so that the cooling efficiency is high, and further,
It is possible to suppress noise generation due to air leakage.

According to the optical device for a lamp of claim 2, in addition to the effect of claim 1, in an emergency in which the lamp bursts, the broken fragments of the lamp flow backward to reach the blower fan and damage the blower fan. The situation can be prevented.

According to the optical device for a lamp of claims 3 and 4, in addition to the effect of claim 2, even if the lamp ruptures, the close contact air guide tube itself is not broken and can be reused. .

According to the lamp optical device of the fifth aspect, the lamp optical device having the effect of the fourth aspect can be realized with a simple structure.

According to the optical device for a lamp of claim 6, since the close air guide tube can be mounted between the lamp box and the lamp unit, the space between the lamp unit and the air guide means by the close air guide tube is increased. Easy connection.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of a lamp optical device 20 according to a first embodiment of the present invention.

FIG. 2 is an operation explanatory view for explaining a corresponding operation that the optical device for a lamp 20 according to the first embodiment shows in an emergency when the lamp 1 bursts.

FIG. 3 is an external perspective view showing the configuration of the close contact air guide tube 8.

FIG. 4 is a configuration diagram showing a configuration of a lamp optical device 21 according to a second embodiment of the present invention.

FIG. 5 is an operation explanatory diagram for explaining a corresponding operation that the lamp optical device 21 according to the second embodiment shows in an emergency in which the lamp 1 bursts.

6 is an external perspective view showing the configuration of the close contact air guide tube 10. FIG.

FIG. 7 is a configuration diagram showing a configuration of a lamp optical device 22 according to a third embodiment of the present invention.

FIG. 8 is an operation explanatory diagram for explaining a corresponding operation that the lamp optical device 22 according to the third embodiment shows in an emergency in which the lamp 1 bursts.

9 (a) is an external perspective view showing the configuration of the close contact air guide tube 12, and FIG. 9 (b) shows a cross section including the instruction line 101 shown in FIG. FIG.

FIG. 10 is a graph showing a result of comparison of noise around the lamp optical device.

FIG. 11 is a graph showing the results of comparing the cooling effects of the light emitting parts of the lamp 1.

FIG. 12 is a configuration diagram showing a main configuration of an air cooling mechanism of a conventional lamp optical device.

[Explanation of symbols]

1 lamp, 1a light emitting part, 1b one end side, 2
Reflector, 2a reflective surface, 2b opening edge, 2c
Exhaust hole, 3 lamp unit, 3a internal space,
3b air inflow opening, 4 lamp box, 4a
Opening part, 4b Distribution opening part, 5 Explosion-proof glass, 6
Blower fan, 7 air guide tube, 8 close air guide tube, 8a
Upper facing part, 8b Lower facing part, 8c Hollow flow path part, 8
d thin portion, 10 close air guide tube, 10a opening,
10b Upper adhesive surface, 10c Cavity, 10d to 10k
Open / close valve, 12 close air guide tubes, 12a upper facing part,
12b lower facing part, 12c hollow channel part, 12d
Outflow opening, 12e side wall, 12f shutter,
12g shutter ball, 12h ball mounting table,
12i ball retracting tube, 20, 21, 22 optical device for lamp.

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // F21Y 101: 00 F21M 7/00 L (72) Inventor Toshimitsu Iwai 2-3-3 Marunouchi 2-3, Chiyoda-ku, Tokyo Ryoden Co., Ltd. (72) Inventor Teruo Miyamoto 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Denki Co., Ltd. (72) Mitsuhiro Kawaguchi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanryo Denki In-house F-term (reference) 3K014 AA01 JA00 3K042 AA01 AB03 AB04 AC06 BA04 BA08 BB03 BC01 CC04 CC10

Claims (6)

[Claims] 1. A lamp for a light source, a lamp unit formed of a reflector and an explosion-proof glass forming a space surrounding at least a light emitting portion of the lamp, a lamp box housing the lamp unit, a blower fan, and the blower fan. An optical device for a lamp, comprising: an air guiding means for guiding the outside air sent by the air; and a close air guiding tube for spatially connecting the air guiding means and the internal space of the lamp unit. 2. The close contact air guide tube is formed of a heat-resistant elastic member having a thin portion that breaks when the internal space reaches a pressure equal to or higher than a predetermined value. Optical device for lamp. 3. The close contact air guide tube is formed of a heat-resistant elastic member having an opening / closing valve that opens the internal space when the internal pressure reaches a predetermined value or higher. Item 2. The optical device for a lamp according to item 1. 4. The close contact air guide tube is formed of a heat-resistant plastic material having an opening, and slides to open the opening when the internal space reaches a pressure of a predetermined value or more to open the internal space. The optical device for a lamp according to claim 1, further comprising a shutter that opens. 5. The shutter comprises a shutter ball, a ball mounting table on which the shutter ball is mounted, and a ball retracting cylinder having an inner space in which the shutter ball is movable. An optical device for a lamp as described. 6. The air guide means includes an air guide tube having one end spatially connected to the blower fan, and a flow opening formed in the lamp box to which the other end of the air guide tube is fixed. The optical device for a lamp according to any one of claims 1 to 5, wherein: