JP6331842B2 - Light source device - Google Patents

Description

  The present invention relates to a light source device combining a short arc type discharge lamp and a reflecting mirror, and more particularly to a light source device used as a light source of a projector.

Conventionally, a combination of a short arc type discharge lamp and a concave reflecting mirror is used as a light source device for a projector. The projector is required to have a light source with good color rendering properties, and conventionally, an ultra-high pressure mercury lamp having a high mercury vapor pressure is suitably used.
A general structure of such a light source device is disclosed in Japanese Unexamined Patent Application Publication No. 2008-010384 (Patent Document 1).
The structure is shown in FIG. 5, and the light source device 31 includes a short arc type discharge lamp 32 and a reflecting mirror 33 that collects light from the lamp 32. The discharge lamp 32 includes a light emitting unit 34 in which a pair of electrodes are disposed to face each other, and a rear sealing unit 34 and a front sealing unit 35 at both ends thereof. The rear sealing portion 34 is fixed in a state of being inserted into the rear neck portion 33 a of the reflecting mirror 33, and the front sealing portion 35 is located on the front opening 33 b side of the reflecting mirror 33.
Feed lines 41 and 42 from a lighting power source 40 are connected to the external lead 37 of the rear sealing portion 35 and the external lead 38 of the front sealing portion 36.
Among these, the power supply line 42 to the front sealing portion 36 passes through the through-hole 43 formed in the reflecting mirror 33, is guided into the reflecting mirror 33, and is wound around and fixed to the external lead 38.

By the way, this type of short arc type discharge lamp may be lit at an extremely high pressure and may burst due to an unexpected trouble. In this case, as shown in FIG. In many cases, stress concentration occurs in the root portion of the sealing portion 36 and the portion is ruptured. Once the rupture occurs, the broken front sealing portion 36 may jump out of the front opening 33b of the reflecting mirror 33 to the outside of the front, and the movement of the front sealing portion 36 is connected to the external lead 38 of the front sealing portion 36. These are only restricted by the power supply line 42, and cannot be prevented from scattering forward, and collide with optical components such as a UV-IR cut filter and a color wheel disposed in front of the light source device. May be damaged.
Since the external lead 38 protrudes from the sealing portion 36, the destructive force at the time of collision is large, and the damage to the optical component is large.

JP 2008-010384 A

  In view of the above-described problems of the prior art, the present invention surrounds a discharge lamp in which a pair of electrodes are disposed opposite to each other in a light emitting portion and sealing portions are formed at both ends of the light emitting portion, and the discharge lamp A rear sealing portion of the discharge lamp is fixed to a rear neck portion of the reflecting mirror, and a power supply line from a lighting power source is provided via a power supply line opening formed in the reflecting mirror. In the light source device that is guided into the reflecting mirror and connected to the external lead of the front sealing portion of the discharge lamp located on the front opening side of the reflecting mirror, even if the discharge lamp bursts, it bursts It is intended to provide a structure in which the front sealing portion is prevented from jumping forward in an unreasonable manner so as not to damage the optical component located in front.

In order to solve the above-described problem, in the light source device according to the present invention, the reflecting mirror is provided with a fixed line opening at a position substantially opposed to the feed line opening with the optical axis as a center, A fixed line having one end fixed is guided into the reflecting mirror through the fixed line opening, and the other end is fixed to the front sealing portion or an external lead of the front sealing portion. And
Further, in the reflecting mirror, the length of the feeder line is longer than the length of the fixed line.
Further, the feeder line and the fixed line are configured by the same common conductive member.
The common conductive member may be fixed to the fixed sleeve by passing through a fixed sleeve fixed to the external lead of the front sealing portion. A trigger wire is wound around a region of the unit adjacent to the light emitting unit, the other end of the fixed wire is wound and fixed on the front sealing unit, and the tip is one end of the trigger wire. One wire of a DC power source that is electrically connected to the trigger wire and applies a voltage to the trigger wire is connected to one end of the fixed wire, and the other wire is an external lead of the rear sealing portion of the discharge lamp. It is characterized by being connected to.

According to the light source device of the present invention, the front sealing portion of the discharge lamp is connected by the power supply line and the fixed line that extend to substantially opposite positions with respect to the rear axis of the reflecting mirror. Even if the rupture may occur, the two feeder lines and the fixed line prevent forward scattering, and optical components arranged in front of the reflecting mirror are not damaged.
Moreover, in what employ | adopted what is called an external trigger system, the number of parts can be reduced and the scattering of a burst sealing part can be prevented by making it a structure which serves as a feeder to a trigger wire. .

Sectional drawing of the light source device of this invention. The top view of FIG. Sectional drawing of the other Example of this invention. Sectional drawing of other Example of this invention. Sectional drawing of the light source device of a prior art. Sectional drawing which shows the malfunction of a prior art.

FIG. 1 is a cross-sectional view of the light source device of the present invention, and FIG. 2 is a top view thereof.
The entire structure is the same as that of the conventional example of FIG. 4, and the light source device 1 includes a discharge lamp 2 and a reflecting mirror 3 surrounding the discharge lamp 2. A pair of electrodes are disposed opposite to each other in the light emitting part 4 of the discharge lamp 2, and a rear sealing part 5 and a front sealing part 6 are provided at both ends of the light emitting part 4. 3, the front sealing portion 6 is located on the front opening 3b side of the reflecting mirror 3.
Feed lines 11 and 12 from the lighting power supply 10 are connected to the external lead 7 of the rear sealing portion 5 and the external lead 8 of the front sealing portion 6, respectively. The one feeding line 12 is led into the reflecting mirror 3 through a feeding line opening 13 formed in the reflecting mirror 3.
A trigger wire 15 is wound around the front sealing portion 6 in the vicinity of the light emitting portion 4, and the trigger wire 15 is connected to the external lead 8 of the front sealing portion 6, and It is electrically connected to the electric wire 12. In addition, you may comprise this trigger wire 15 and the feeder 12 with the same member.
The trigger method in this embodiment is a so-called internal trigger method.

A fixed line opening 14 is formed in the reflecting mirror 3 at a position substantially opposed to the feeder line opening 13 with the optical axis of the reflecting mirror 3 as the center. Then, a fixed line 16 having one end fixed to the outer surface of the reflecting mirror 3 is guided into the reflecting mirror 3 through the fixed line opening 14 and is connected to the external lead 8 of the front sealing portion 6 of the discharge lamp 2. It is fixed.
As a result, as shown in FIG. 2, the external lead of the front sealing portion of the discharge lamp 2 is formed by the power supply line 12 and the fixed line 16 that extend inward from the openings 13 and 14 at substantially opposite positions of the reflecting mirror 3. 8 is supported.

By doing so, even if the discharge lamp 2 may rupture, scattering of the ruptured front sealing portion 6 is suppressed by the feeder line 12 and the fixed line 16, and the front of the reflecting mirror 3 is prevented. And the optical component arranged in front of the reflecting mirror 3 is not damaged.
In addition, although the fixing line 16 showed the structure fixed to the external lead 8 of the front sealing part 6, the structure wound around the front sealing part 6 itself and fixing may be sufficient. The fixing of one end of the fixed line 16 is not limited to the reflecting mirror 3 and may be fixed to the surrounding members.
Further, it is not necessary that the feeder line opening 13 and the fixed line opening 14 be positioned strictly opposite to each other. It suffices if it is provided at a position where it is possible to prevent scattering.
Furthermore, although the rupture of the discharge lamp 2 has been described as a rupture at the front sealing portion 6, it is obvious that the scattering prevention is similarly performed when the rear sealing portion 5 is ruptured.

As shown in FIG. 2, it is preferable that the feeder line 12 is longer than the fixed line 16 in the reflecting mirror 3. Specifically, the length Lx of the feed line 12 extending from the feed line opening 13 to the external lead 8 and the length Ly of the fixed line 16 extending from the fixed line opening 14 to the external lead 8 satisfy Lx> Ly. The length of the line is adjusted. As a result, the feed line 12 is stretched between the feed line opening 13 and the external lead 8 in a slightly loosened state rather than the fixed line 16.
This is because the power supply line 12 is a power supply path of the discharge lamp 2, and is likely to be hotter than the fixed line 16 when a current is input, and disconnection due to the effects of thermal expansion and contraction or to the sealing portion 6. The load is likely to occur. Therefore, with the above configuration, the thermal expansion or thermal contraction of the power supply line 12 is alleviated by appropriately relaxing the power supply line 12.
On the other hand, by adjusting the length Ly of the fixed line 16 to be shorter than the length Lx of the power supply line 12, it is possible to suitably prevent the sealing portion 6 from being scattered when the lamp is ruptured.

Moreover, the installation work of the discharge lamp 2 to the reflecting mirror 3 becomes easy by designing the feeder 12 to be relatively long. Specifically, the discharge lamp 2 needs to be installed on the reflecting mirror 3 so that the output light from the light source device becomes the highest. Therefore, after the rear sealing portion 5 of the discharge lamp 2 is inserted into the rear neck 3a of the reflecting mirror 3, before the positions of the rear end sealing portion 5 and the reflecting mirror 3 are fixed with an adhesive, the discharge lamp 2 By finely adjusting the position in the tube axis direction (vertical direction in FIG. 1) and the circumferential direction, it is adjusted to the optimum position where the output light is highest.
In the adjustment process described above, it is necessary to perform alignment while confirming increase / decrease in the output light from the light source device, and the power supply line 12 is aligned in a state of being connected to the external lead 8 in advance. Here, when the feed line 12 is short, the range of position adjustment of the discharge lamp 2 (that is, the range of adjustment in the tube axis direction and the circumferential direction) is limited, and sufficient position adjustment cannot be performed.
Therefore, it is desirable that the length Lx of the feeder line 12 be long so that sufficient position adjustment can be performed.

  For example, the length of the feeder line 12 and the fixed line 16 in the reflecting mirror 3 is 40 mm, and the length of the fixed line is 30 mm. Thus, it is desirable that the feed line 12 and the fixed line 16 are adjusted to a ratio of 4: 3.

In addition, although the fixed line 16 was demonstrated as a member different from the feeder line 12, it can also be comprised with the same same electroconductive member. That is, in the embodiment shown in FIG. 1, after the power supply line 12 is wound around and fixed to the external lead 8, it is led out from the fixed line opening 14 as it is as the fixed line 16 to the outside of the reflecting mirror 3, and its end is reflected by the reflecting mirror. 3 can be fixed.
Further, another embodiment in which the power supply line 12 and the fixed line 16 are formed of the same member is shown in FIG. 3, and a conductive wire is inserted through the metal fixed sleeve 18 and penetrates the fixed sleeve 18. The one extending to the feed line opening 13 is the feed line 12 and the other extending to the fixed line opening 14 is the fixed line 16. The sleeve 18 is fixed at an arbitrary position on the conductive wire by caulking after passing the conductive wire. The sleeve 18 is fixed to the external lead 8 by welding or soldering, for example, and the power supply line 12 and the external lead 8 are electrically connected via the sleeve 18.
With the above configuration, there is an advantage that the attachment work of the feeder line 12 and the fixed line 16 is simplified, and the ratio between the length Lx of the feeder line 12 and the length Ly of the fixed line 16 can be easily adjusted.

Further, when the power supply line 12 and the fixed line 16 are formed of different members, it is preferable that the power supply line 12 has a larger diameter than the fixed line 16.
In a high input lamp, if the wire diameter of the power supply line 12 is thin, the power supply line itself becomes an electric resistance and easily generates heat, resulting in a large energy loss.
On the other hand, the fixed line 16 only needs to have sufficient strength to prevent the front sealing portion 6 from being scattered when the lamp is ruptured. If the wire diameter is increased more than necessary, the light reflected by the reflecting mirror 3 is easily blocked. , Reducing the light utilization efficiency. Therefore, it is preferable to make the power supply line 12 thicker than the fixed line 16.
For example, the wire diameter of the feeder line is φ0.6 mm, and the wire diameter of the fixed wire is φ0.5 mm.

FIG. 4 shows another embodiment, which is an embodiment in the case where a so-called external trigger system is adopted.
That is, the fixed line 16 having one end fixed is wound around and fixed to the front sealing portion 6 of the discharge lamp 2 at the other end. Further, the tip is electrically connected to the trigger wire 15.
One wiring 21 of the DC power supply 20 that feeds the trigger wire 15 is electrically connected to the external lead 7 of the rear sealing portion 5 of the discharge lamp 2, and the other wiring 22 is connected to the fixed line 16. Is electrically connected to one end.
As a result, power is supplied from the DC power supply 20 to the trigger wire 15 through the fixed line 16. That is, the fixed line 16 also functions as a power supply line to the trigger wire 15. The fixed line 16 may be composed of the same member as the trigger wire 15.
In this embodiment, the fixing wire 16 is wound around and fixed to the front sealing portion 6 and cannot be fixed to the external lead 8 of the front sealing portion 6 as a matter of course in the circuit configuration.

An experiment was conducted to demonstrate the effect of the present invention.
The following burst experiment was conducted using the light source device having the configuration shown in FIGS. 1 and 2 as an example of the present invention and using the light source device having the configuration shown in FIG. 5 as a comparative example.
Light source device: 330 kW type discharge lamp Lighting condition: AC 330 W is input when lighting. There is no cooling.
Rupture conditions: Use a burst ballast for AC330W and rupture 4 minutes after lighting.
Impact of rupture: Whether the front glass placed in front of the lamphouse reflector is damaged.

Under the above experimental conditions, the experiment and the comparative example were conducted 10 times each, and the effect on the front glass after the discharge lamp burst was verified.
In the comparative example, the sealing part and the feeder line collided with the front glass and were damaged in all experiments during 10 times.
In the examples, there was no collision with the front glass and no damage was observed in all experiments during 10 times.
Thereby, the scattering prevention effect of the rupture sealing part by the feeder line and the fixed line was proved.

  As described above, in the light source device of the present invention, the reflector has the fixed line opening formed at a position substantially opposed to the feeder opening with the optical axis as the center, and one end is fixed. A fixed line is led into the reflecting mirror through the fixed line opening, and the other end side is fixed to the front sealing portion or the external lead of the front sealing portion, so that the discharge lamp bursts. Even if there is nothing, the ruptured sealing portion does not scatter in front of the reflecting mirror, and other optical components positioned in front of the reflecting mirror are not damaged.

DESCRIPTION OF SYMBOLS 1 Light source device 2 Discharge lamp 3 Reflecting mirror 4 Light emission part 5 Back sealing part 6 Front sealing part 7, 8 External lead 10 Lighting power source 11,12 Feed line 13 Feed line opening 14 Fixed line opening 15 Trigger wire 16 Fixed Wire 18 Fixed sleeve 20 DC power supply

Claims (5)

A discharge lamp in which a pair of electrodes are disposed opposite to each other in the light emitting part, and a sealing part is formed at both ends of the light emitting part, and a reflecting mirror surrounding the discharge lamp,
A rear sealing portion of the discharge lamp is fixed to a rear neck portion of the reflecting mirror, and
A power supply line from a lighting power source is guided into the reflecting mirror through a power supply line opening formed in the reflecting mirror, and a front sealing portion of the discharge lamp located on the front opening side of the reflecting mirror. In the light source device connected to the external lead,
The reflecting mirror is provided with a fixed line opening at a position substantially opposed to the feed line opening with the optical axis as a center,
A fixed line with one end fixed is guided into the reflecting mirror through the fixed line opening, and the other end is fixed to the front sealing portion or an external lead of the front sealing portion ,
The light source device, wherein the power supply line and the fixed line prevent the front sealing portion from scattering forward when the discharge lamp is ruptured .
  The light source device according to claim 1, wherein a length of the feeder line is longer than a length of the fixed line in the reflecting mirror.   The light source device according to claim 1, wherein the power supply line and the fixed line are configured by the same common conductive member.   The light source device according to claim 3, wherein the same common conductive member passes through a fixing sleeve fixed to an external lead of the front sealing portion and is fixed to the fixing sleeve. . A trigger wire is wound around a region near the light emitting part in the front sealing part,
The other end of the fixed wire is wound and fixed around the front sealing portion, and the tip is electrically connected to one end of the trigger wire,
One wiring of a DC power source for applying a voltage to the trigger wire is connected to one end of the fixed wire, and the other wiring is connected to an external lead of a rear sealing portion of the discharge lamp. The light source device according to claim 1.

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