JP2010186656A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce oscillation noise generated from a light source device used for a liquid crystal projector including a data projector and a projector for a home-theater. <P>SOLUTION: In the light source device provided with a high-pressure discharge lamp 1 with lines for an electric power supply (5R, 5L) to a pair of electrodes each located in countering positions inside of an emission portion formed in the middle part of an arc tube 2, and projecting from both ends of an encapsulated airtight arc tube 2 and lead wires 6R, 6L, are attached to the projected portions of the lines and connected to a power supply line and a concave reflection mirror 7 to reflect light emitted from the lamp 1. The device is characterized by an arrangement of at least one of the lead wires (6R, 6L) prepared by a lead wire formed of either a non-ferromagnetic material or, that using an alloy of a ferromagnetic material and a diamagnetic or a paramagnetic substance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a light source device used for a liquid crystal projector, a fiber lighting device, and the like.

As shown in FIG. 1, a light source device used in a liquid crystal projector such as a data projector or a home theater projector, which has been popular in recent years, has a light emitting unit 3 formed in an intermediate portion of a light emitting tube 2 made of a quartz glass tube. Feeding wires 5R and 5L for supplying power to a pair of opposed tungsten electrodes 4R and 4L are respectively projected from both ends of the hermetically sealed arc tube 2, and are projected to the projecting portions. A high-pressure discharge lamp 1 connected to the power supply line via the attached lead wires 6R and 6L, and a concave reflecting mirror 7 that reflects light emitted from the lamp 1 and increases its light utilization efficiency are provided. .

The high-pressure discharge lamp 1 has one end of the arc tube 2 fixed to the bottom portion 8 of the concave reflecting mirror 7 with cement or the like, and attached to the protruding portion of the power supply wire 5R protruding from the other end of the arc tube 2. The lead wire 6R is drawn out to the back side of the concave reflecting mirror 7 through a small hole 9 for wiring penetrating the reflecting portion of the concave reflecting mirror 7, and is fixed to the back surface of the reflecting mirror 7. 10 is connected to a power supply line 11R for supplying lamp power. The connection fitting 10 has a configuration in which the terminal of the lead wire 6R drawn to the back side of the concave reflecting mirror 7 and the terminal of the power supply line 11R are fastened with screws 12 and connected.

Further, the power supply wires 5R and 5L are made of rigid molybdenum wires, and the lead wires 6R and 6L attached to the wires 5R and 5L are made of nickel wires that can be bent freely. Further, mercury, a halogen such as iodine or bromine, and a rare gas such as argon gas are enclosed in the light emitting portion 3 of the arc tube 2 in which the pair of tungsten electrodes 4R and 4L are arranged so as to face each other. Molybdenum foils 14 interposed between the electrode 4R and the power supply wire 5R and between the electrode 4L and the power supply wire 5L are sealed in the sealing portions 13R and 13L that hermetically seal both ends of the tube 2, respectively. (See Patent Document 1).

In the liquid crystal projector using the light source device configured as described above, the light emitted from the light source device is cut, for example, by an infrared cut filter, and then through an optical system such as a condenser lens or a polarization filter, The moving image and still image of the liquid crystal panel are magnified by a projection lens and projected onto a screen. The housing, which is the fuselage, is cooled by the light source device or heated by radiant heat from the light source device. A cooling fan is installed to cool the liquid crystal panel and polarizing filter.

However, a light source device for a liquid crystal projector is required to develop a high-power high-pressure discharge lamp in order to obtain a brighter projection image, and is emitted from the lamp as the lamp output increases. As the amount of heat generated also increases, it is necessary to increase the amount of air blown by increasing the number of rotations of the cooling fan that suppresses the temperature rise in the housing of the liquid crystal projector or increasing the size of the fan. However, if it does in that way, the operation sound of a cooling fan, a wind noise, etc. will become so loud that it will be felt as noise.

Therefore, conventionally, an invention has been made to reduce the noise of the cooling fan by devising the mutual positional relationship between the cooling fan and the air filter that purifies the outside air taken into the housing of the liquid crystal projector by the cooling fan (see Patent Document 2). ), Or by changing the direction of the movable rectifier plate that cools the liquid crystal panel and other external air taken into the housing of the liquid crystal projector by the cooling fan and then discharges it outside the housing. An invention that prevents transmission (see Patent Document 3) has been proposed.

Recently, however, low-noise sirocco fans and DC axial fans have been developed as cooling fans for liquid crystal projectors. For example, a cooling fan equipped with a silent mode that lowers the operating noise has a silent operation of about 19 dB to 27 dB. Even if you are in a quiet room such as a conference room where external sound is blocked, if you are speaking in that room, you can hear the fan's operating sound unless you bring your ears close to the LCD projector. Since it cannot be heard, the noise of the cooling fan is no longer regarded as a problem. However, due to the low noise of the cooling fan, the high frequency noise of the light source device, which has not been regarded as a problem so far, now stands out, especially for data projectors used for presentations in conference rooms etc. In a liquid crystal projector such as a home theater projector used for movie watching in a house, high-frequency noise generated from a light source device installed in the housing may be annoying and uncomfortable.

Therefore, the present inventors have found a source of high-frequency noise in the light source device shown in FIG. 1, and the main source is the power supply wires 5R and 5L protruding from both ends of the arc tube 2 of the high-pressure discharge lamp 1. It was found that the lead wires 6R and 6L were attached. That is, when the high pressure discharge lamp 1 is AC lighting, when the lamp 1 is lit, the direction of the current flowing through the lead wires 6R, 6L varies, and the direction of the electromagnetic force acting on the lead wires 6R, 6L also changes. Due to the change in the direction of the force, the lead wires 6R and 6L vibrate at high frequency, and a roaring sound such as a zy sound or a woo sound is generated, and one end of the power supply wire 5R of the high pressure discharge lamp 1 is provided. Since the other end side of the lead wire 6R attached with is fixed to the concave reflecting mirror 7 by being fastened with screws 12 to the connection fitting 10 fixed to the back side of the concave reflecting mirror 7, It was found that the reflecting mirror 7 resonated and the vibration sound of the lead wire 6R was amplified.

The material used for the lead wires 6R and 6L is nickel wire, which is generally used because it is excellent in heat resistance, corrosion resistance, and cost. However, since nickel is a ferromagnetic material, the influence of electromagnetic force that acts when the lamp is lit is large, and vibration noise is easily amplified.

JP 2007-42409 A JP-A-9-130713 JP-A-6-148590

It is a technical object of the present invention to reduce noise generated from a lead wire attached to a power supply wire protruding from both ends of an arc tube of a high-pressure discharge lamp, thereby reducing the noise of the light source device.

In order to solve the above-mentioned problems, the present invention provides a power supply wire for supplying power to a pair of electrodes disposed opposite to each other in a light emitting part formed in an intermediate part of a light emitting tube, and is hermetically sealed. A high-pressure discharge lamp that protrudes from both ends of the arc tube and is connected to the power supply line via a lead wire attached to the protruding portion; and a concave reflector that reflects light emitted from the lamp; The at least one of the lead wires is formed of a lead wire using a material that is not a ferromagnetic material, or an alloy of a ferromagnetic material and a diamagnetic material or a paramagnetic material. Features.

In the light source device of the present invention, at least one of the lead wires attached to the protruding portion of the power supply wire protruding from both ends of the arc tube of the high pressure discharge lamp is a material that is not a ferromagnetic material, or a ferromagnetic material and a diamagnetic material. Alternatively, it is formed of a lead wire using a paramagnetic alloy and is used for the lead wires 6R and 6L made of a single wire S as shown in FIG. Therefore, there is an excellent effect that the noise is inevitably reduced and the noise is reduced as compared with the conventional apparatus.

Sectional drawing which shows an example of the light source device which concerns on this invention, and the conventional light source device

The best mode of the light source device according to the present invention is for supplying power to supply power to a pair of tungsten electrodes arranged opposite to each other in a light emitting portion formed in an intermediate portion of a light emitting tube made of a quartz glass tube. Light is emitted from the high-pressure discharge lamp in which the wires are respectively protruded from both ends of the hermetically sealed arc tube and connected to the power supply line via the lead wire attached to the protruding portion. The high-pressure discharge lamp has a lead that is fixed to the bottom of the concave reflector and attached to the protruding portion of the power supply wire that protrudes from both ends of the arc tube. Both wires are made of molybdenum wire or nickel (monel) wire containing 30% copper that is not a ferromagnetic material such as nickel or iron, and power is supplied without being fixed to the concave reflector. Line and connection It is.

FIG. 1 is a cross-sectional view showing an example of a light source device according to the present invention.

In the light source device shown in FIG. 1, one end of the arc tube 2 of the high-pressure discharge lamp 1 is fixed to the bottom portion 8 of the concave reflecting mirror 7, and the projecting portion of the power supply wire 5 </ b> L projects from the one end of the arc tube 2. The attached lead wire 6L and the lead wire 6R attached to the protruding portion of the power supply wire 5R protruding from the other end of the arc tube 2 disposed on the opening side of the concave reflecting mirror 7 are both wires. It is formed of molybdenum wire with a diameter of about 0.5 mm or nickel (monel) wire containing 30% copper, and is welded to the power supply wires 11R and 11L without being fixed to the concave reflecting mirror 7. Has been.

Molybdenum wire or nickel (monel) wire containing 30% copper has less electromagnetic force acting on the lead wire compared to ferromagnetic nickel and iron wire, so vibration is reduced, so the vibration noise is inevitably Get smaller.

Further, the present inventors prepared four light source devices configured as shown in FIG. 1, and the lead wires 6R and 6L of the device are formed of nickel wire, iron wire, molybdenum wire, and monel wire, and the devices are of the same type. The noise generated from each liquid crystal projector was measured with a noise meter installed near the exhaust port of the cooling fan closer to the cooling fan than the light source device. And the measurement result as shown in 4 was obtained.

That is, Table 1 is a graph showing measurement results of noise generated from the liquid crystal projector provided with the light source device of FIG. 1 in which the lead wires 6R and 6L are formed of nickel wires, and Table 2 is a lead wire 6R and 6L of iron wires. FIG. 3 is a graph showing measurement results of noise generated from the liquid crystal projector in which the light source device of FIG. 1 is installed, and Table 3 is from the liquid crystal projector in which the light source device of FIG. 1 in which the lead wires 6R and 6L are formed of molybdenum wires is installed. FIG. 4 is a graph showing measurement results of noise generated, and Table 4 is a graph showing measurement results of noise generated from the liquid crystal projector in which the light source device of FIG. 1 in which the lead wires 6R and 6L are formed of monel wires is installed. In the graph as well, the solid line represents the sound pressure level and frequency of noise generated when the high-pressure discharge lamp 1 is lit and the cooling fan is operating. Broken line represents a sound pressure level and frequency of noise resulting only cooling fan when is operated.

According to Tables 1 and 2, the liquid crystal projector provided with the light source device of FIG. 1 in which the lead wires 6R and 6L are formed of nickel wire or iron wire is used in a high frequency region of noise generated during lighting of the high pressure discharge lamp 1. The sound pressure level is higher than the sound pressure level in the high frequency region of noise generated when only the cooling fan is operated without lighting the high pressure discharge lamp 1.

On the other hand, according to Table 3, the liquid crystal projector provided with the light source device of FIG. 1 in which the lead wires 6R and 6L are formed of molybdenum wires has a sound pressure level of noise generated while the high pressure discharge lamp 1 is turned on, and a high pressure discharge. The sound pressure level of noise generated when only the cooling fan is operated without turning on the lamp 1 is almost the same. That is, the sound pressure level of noise generated while the lamp is on is almost the same as the sound pressure level of noise generated when only the cooling fan is operated without lighting the lamp.

According to Table 4, the liquid pressure projector provided with the light source device of FIG. 1 in which the lead wires 6R and 6L are formed of Monel wires has a lower sound pressure level than the nickel wires in Table 1.

Table 3 shows that the sound pressure level of noise generated when the high-pressure discharge lamp 1 is lit and the sound pressure level of noise generated when only the cooling fan is operated without turning on the high-pressure discharge lamp 1. . That is, the sound pressure level of noise generated while the lamp is on is almost the same as the sound pressure level of noise generated when only the cooling fan is operated without lighting the lamp. Thus, if the lead wires 6R and 6L used in the light source device of FIG. 1 are changed from one made of nickel wire to one made of molybdenum wire, the high frequency of noise generated during the lighting of the high-pressure discharge lamp 1 is changed. The sound pressure level in the area is greatly reduced.

In the light source device of FIG. 1 shown as an embodiment of the present invention, both of the lead wires 6R and 6L are formed of molybdenum wires that are not ferromagnetic materials, and are most effective in reducing vibration noise. The invention is not limited to this, and includes one in which one of the lead wires 6R and 6L is formed of a molybdenum wire that is not a ferromagnetic material and the other is formed of a lead wire that is a ferromagnetic material. Further, the lead wires 6R and 6L made of a ferromagnetic material made of a metal alloy other than the ferromagnetic material can reduce vibration noise as compared with the lead wire made of a ferromagnetic material.

The present invention reduces vibration noise generated from a light source device used in a liquid crystal projector such as a data projector or a home theater projector, and contributes to the silence of the liquid crystal projector.

DESCRIPTION OF SYMBOLS 1 High pressure discharge lamp 2 Light emission tube 3 Light emission part 4R electrode 4L electrode 5R Feeding wire 5L Feeding wire 6R Lead wire 6L Lead wire 7 Concave reflector 8 Bottom part of concave reflector 11R Power supply line 11L Power supply line

Claims (8)

Feeding wires for supplying power to a pair of electrodes arranged opposite to each other in the light emitting part formed in the middle part of the arc tube are respectively protruded from both ends of the hermetically sealed arc tube. In a light source device comprising a high-pressure discharge lamp connected to a power supply line via a lead wire attached to the protruding portion, and a concave reflecting mirror that reflects light emitted from the lamp, at least one of the lead wires One of the light source devices is formed of a paramagnetic or diamagnetic material. One end of the arc tube of the high-pressure discharge lamp is fixed to the bottom portion of the concave reflecting mirror, and a lead wire attached to the protruding portion of the power supply wire protruding from the other end of the arc tube is paramagnetic or anti-reflective. The light source device according to claim 1, wherein the light source device is made of a magnetic material. The lead wire attached to the protruding portion of the power supply wire protruding from one end of the arc tube fixed to the bottom portion of the concave reflecting mirror is formed of the paramagnetic or diamagnetic material. Light source device. 4. The light source device according to claim 1, wherein the lead wire formed of the paramagnetic or diamagnetic material is connected to the power supply line without being fixed to the concave reflecting mirror. Feeding wires for supplying power to a pair of electrodes arranged opposite to each other in the light emitting part formed in the middle part of the arc tube are respectively protruded from both ends of the hermetically sealed arc tube. In a light source device comprising a high-pressure discharge lamp connected to a power supply line via a lead wire attached to the protruding portion, and a concave reflecting mirror that reflects light emitted from the lamp, at least one of the lead wires One of the light source devices is formed of an alloy with a paramagnetic or diamagnetic material. One end of the arc tube of the high-pressure discharge lamp is fixed to the bottom portion of the concave reflecting mirror, and a lead wire attached to the protruding portion of the power supply wire protruding from the other end of the arc tube is paramagnetic or anti-reflective. 6. The light source device according to claim 5, wherein the light source device is formed of an alloy with a magnetic material. The lead wire attached to the protruding portion of the power supply wire protruding from one end of the arc tube fixed to the bottom portion of the concave reflecting mirror is formed of an alloy with the paramagnetic or diamagnetic material. 5. The light source device according to 5. The light source device according to claim 5, wherein the lead wire formed of the paramagnetic or diamagnetic material is connected to the power supply line without being fixed to the concave reflecting mirror.

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