JP2008108518A - Light source apparatus and projector type video display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source apparatus high in operation speed in a temperature detector detecting an abnormal rise in temperature at a surrounding of a light source. <P>SOLUTION: The light source apparatus is provided with; a high intensity discharge lamp 11 with its radiating direction set in a horizontal direction, an outside wall 12 storing the high intensity discharge lamp 11 by exposing a radiating surface, and a housing composed of an inside wall 20 and a front wall 22. In addition, a heat collecting part 28 collecting surrounding heat heated by the high intensity discharge lamp 11 and bimetal 50 detecting the temperature of the heat collecting part 28 by being brought into contact with the heat collecting part 28 are provided. The heat collecting part 28 is made of a material with higher heat conductivity than that of the housing and provided to surround the high intensity discharge lamp 11 at the inner side of the inside wall 20 with a gap 30 from the inside wall 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light source device including a thermal protection device that thermally protects the periphery of a light source, and a projection-type image display device including the light source device.

  Conventionally, the light source of a projector is required to have high brightness for fine image display with excellent color reproducibility. High-intensity discharge lamps such as metal halide lamps and high-pressure mercury lamps are used as concave reflectors (reflecting mirrors). ) Is used.

  A high-intensity discharge lamp encloses mercury, halogen gas, etc. in a light-emitting tube that houses electrodes, and when it is lit, it becomes hot as it emits light (about 1000 ° C at the highest temperature), so air passes through the light source device. There is known a light source device that cools a light source (for example, Patent Documents 1 and 2).

There are the following proposals for abnormal heating of a high-intensity discharge lamp (lamp) in this type of projector.
In the example shown in Patent Document 3, a thermal switch is arranged outside a lamp housing that supports a lamp in a projector case, and this thermal switch is connected to a lamp control unit in a lamp lighting circuit. The operation of the lamp control unit to be controlled is stopped, the thermal switch is operated, and the lamp is turned off without using software.

In the example shown in Patent Document 4, the lamp power supply is arranged near the lamp house so that the lamp and the lamp power supply are cooled by a common cooling fan, and a thermal switch is provided inside the lamp power supply. In the event that the cooling fan stops, the lamp power supply is also heated by heating the lamp, the thermal switch inside the lamp power supply operates, shuts off the lamp power supply, and turns off the lamp. The abnormal heating is prevented.
JP 2000-36214 A JP 2000-36215 A JP 2002-148715 A JP 2002-150832 A

By the way, in the lamp house of the conventional projector light source unit, in the abnormal situation where the cooling fan provided around the light source unit is out of order and the light source is lit, as a double triple safety device, A temperature detection type protective component (hereinafter referred to as “heating protection component”) bimetal, a thermal fuse, and the like are attached to the lamp house.
Depending on the installation direction, the projector has a stationary installation or a ceiling installation (ceiling suspension). When the ceiling is installed, the projector is often installed in an upside down direction.

FIG. 12 is a schematic partial sectional view showing a light source device of a conventional projector in which only one heat protection component is provided.
A conventional high-intensity discharge lamp 8 is provided in a highly heat-resistant housing 2, the lamp bulb 1 is attached to a concave reflecting mirror 3, and the front surface of the reflecting mirror 3 is sealed with a disk-shaped explosion-proof glass 5. Power is supplied from the lamp block 7 to the lamp bulb 1.
The heating protection component mounting method shown in FIG. 12 is such that the bimetal 4 is mounted on the rear surface of the housing 2.

In such a conventional heating protection component mounting method, both the stationary installation and the ceiling installation are performed when the cooling fan provided around the high-intensity discharge lamp 8 is stopped and the high-intensity discharge lamp 8 is turned on. The change in temperature with time of the protective component is small.
Therefore, in the conventional example shown in FIG. 12, the temperature rise of other parts around the high-intensity discharge lamp 8 becomes large, and when the bimetal 4 operates, the temperature damage of other parts becomes large.

Since the high-intensity discharge lamp 8 originally has a higher temperature on the upper side than the lower side of the lamp bulb 1 even during normal lighting, the amount of heat radiation from the lamp bulb 1 is vertical in the housing 2 with respect to the bottom surface. The amount of heat radiation to the upper surface is large, so that the upper part of the housing 2 is hotter than the lower part.
Visible light from the high-intensity discharge lamp 8 is reflected in front of the high-intensity discharge lamp 8 by the reflecting mirror 3, but ultraviolet rays and infrared rays (see the dotted arrows in FIGS. 12, 13, and 14). Transparent. Further, since the temperature of the reflecting mirror 3 itself becomes high, heat radiation from the reflecting mirror 3 is also generated.

In addition to this heat radiation, when the high-intensity discharge lamp 8 is not turned off even if the cooling fan provided around the high-intensity discharge lamp 8 is stopped, Due to the natural convection of the air, air having a high temperature is accumulated above the housing 2, and air having a lower temperature than that above is accumulated below the housing 2. In this manner, when the cooling fan around the high-intensity discharge lamp 8 is stopped, the temperature difference between the upper side and the lower side of the housing 2 becomes considerably large.
Therefore, the attachment method of the heat protection component shown in FIGS. 13 and 14 is used.

13 and 14 are schematic partial sectional views showing a light source device of a conventional projector in which two heat protection components are arranged. FIG. 13 shows a case where the installation direction of the projector is stationary installation, and FIG. This is a case where the installation direction of the projector is ceiling installation (ceiling mount).
In the example shown in FIG. 13, the bimetal 4 is attached to the upper surface of the housing 2 and the thermal fuse 6 is attached to the lower surface. The example shown in FIG. 14 is a ceiling installation. A thermal fuse 6 is attached to the upper surface of the body 2 and a bimetal 4 is attached to the lower surface.

  The heating protection component mounting method shown in FIGS. 13 and 14 is a method used for operating the heating protection component to some extent even when the projector is installed or suspended from the ceiling. The method of using one piece is limited due to the space, and in practice, one bimetal and one temperature fuse are often used as shown in FIGS.

In the conventional heating protection component mounting method shown in FIG. 13, as described above, the cooling fan around the high-intensity discharge lamp 8 stops and the high-intensity discharge lamp 8 is in an abnormal state where the high-intensity discharge lamp 8 is lit. Due to the radiant heat of 8, the temperature in the upper part of the housing 2 rises rapidly, and the temperature in the lower part rises slowly compared to the upper part.
Therefore, in order to quickly activate the heat protection component as the temperature rises, the bimetal 4 is activated during the stationary installation shown in FIG. 13, and the thermal fuse 6 is activated during the ceiling suspension shown in FIG.

  In FIG. 13, the bimetal 4 is disposed on the upper surface of the housing 2 and the thermal fuse 6 is disposed on the lower surface. However, the bimetal 4 is disposed in the housing due to the replacement method and size restriction of the high-intensity discharge lamp 8. In some cases, the thermal fuse 6 is disposed near the upper side of the side surface of the body 2, and the thermal fuse 6 is disposed near the lower side of the side surface of the housing 2.

However, in the conventional example shown in FIGS. 12 to 14, the housing 2 is generally made of a heat-resistant plastic and is made of a material having a low thermal conductivity of about 1 W / (m · K). Slow heat transfer to parts.
In the example shown in FIG. 12, since the bimetal 4 (heating protection component) is disposed near the back surface with respect to the high-intensity discharge lamp 8, when the cooling fan provided around the high-intensity discharge lamp 8 is stopped, The temperature rise above the high-intensity discharge lamp 8 is fast, the temperature rise below the high-intensity discharge lamp 8 is slow, and the heating protection component can respond quickly in response to abnormal heating of the high-intensity discharge lamp 8. There is room for improvement.

  Further, in the example shown in FIGS. 13 and 14, since there are two types of heat protection components (bimetal 4 and thermal fuse 6), the overall cost of the mounting structure or the board structure becomes high, and the thermal fuse 6 If it is not used at a certain low temperature, there is room for improvement because there is a risk of an abnormal operation in which a thermal repetitive load accumulates and operates at a temperature lower than a predetermined operating temperature.

  Patent Documents 1 and 2 disclose a configuration for cooling a high-intensity discharge lamp (lamp), and Patent Documents 3 and 4 detect temperature with a thermal switch for abnormal heating of the high-intensity discharge lamp (lamp). However, these patent documents do not disclose a configuration for quickly operating the heat protection component in consideration of abnormal operation and cost of the heat protection component (including the thermal switch).

  This invention is made | formed in view of such a situation, The place made into the objective is provided with the structure which made the heat conductivity of the heat collecting part independent of a housing | casing higher than a housing | casing. Accordingly, it is an object of the present invention to provide a light source device in which the operating speed of a temperature detector that detects an abnormal temperature increase is high even if the temperature around the light source increases.

  Another object of the present invention is to provide a configuration in which the heat conductivity of the heat collecting part that is fitted to the rear side of the housing and made a part of the housing is higher than that of the housing. An object of the present invention is to provide a light source device that is easy to transfer heat to the heat collecting part even when the temperature around the light source rises abnormally, and the operating speed of the temperature detector that detects the abnormal temperature rise is fast.

  Furthermore, another object of the present invention is to provide a light source that has a substantially U-shaped heat collecting portion in a side view in the irradiation direction, particularly efficiently collects heat due to natural convection and has a high operating speed of the temperature detector. To provide an apparatus.

  Another object of the present invention is to provide a heat collecting part having a substantially U-shaped irradiation side view and lateral cross section, thereby efficiently collecting not only heat transferred by natural convection but also radiant heat, An object of the present invention is to provide a light source device in which the operating speed of a temperature detector is high.

  Another object of the present invention is to provide a heat collecting part made of a material having a higher thermal diffusivity than the housing, thereby making the temperature rise of the heat collecting part faster than the temperature rise of the housing around the light source. An object of the present invention is to provide a light source device which can be operated and the temperature detector operates quickly.

  Another object of the present invention is to provide a heat collecting part that is surface-treated so as to have an emissivity higher than that of the inner wall of the casing, so that the temperature of the heat collecting part is higher than the temperature rise of the casing around the light source. An object of the present invention is to provide a light source device that can increase the speed quickly and can operate the temperature detector quickly.

  Another object of the present invention is to provide a heat collecting part whose thermal conductivity at 100 ° C. is 50 W / (m · K) or more, thereby speeding up heat conduction due to an abnormal temperature rise of the light source. An object of the present invention is to provide a light source device capable of operating the temperature detector quickly.

  Another object of the present invention is that the material is provided with a heat collecting part made of aluminum, copper, or an alloy mainly made of aluminum or copper, so that heat conduction is good and heat can be quickly transferred to the temperature detector. It is in providing the light source device which can be performed.

  Another object of the present invention is to provide a light source device that can collect heat due to natural convection in the surface direction of the heat collecting portion more effectively by providing the heat collecting portion formed of a graphite sheet. There is to do.

  Another object of the present invention is to provide a light source device that includes a heat collecting part of a heat plate that uses latent heat of vaporization, so that heat transfer is fast and heat can be transferred quickly to a temperature detector. It is in.

  Another object of the present invention is that the upper part and the lower part respectively facing the top and bottom surfaces of the housing are provided with heat collecting portions having the same form, so that, for example, even if the top and bottom are reversed due to the installation method of the light source device, An object of the present invention is to provide a light source device that has no change in the heat collection efficiency of a hot part, efficiently collects heat, and can conduct heat quickly.

  An object of the present invention is to provide a projection image display device that includes the light source device of the present invention, so that the temperature detector of the light source device can quickly detect an abnormal temperature rise and turn off the light source quickly. It is to provide a type image display device.

  The light source device of the present invention is a light source device including a housing that encloses and accommodates the light source except for an irradiation path of the light source, and a heat collector that collects ambient heat heated by the light source, and contacts the heat collector And a temperature detection unit for detecting the temperature of the heat collection unit, wherein the heat collection unit is made of a material having a higher thermal conductivity than the case, and surrounds the light source. It is characterized in that it is provided inside the body with the casing and a gap.

  In the light source device of the present invention having such a configuration, when the cooling fan that cools the light source fails due to a light source that generates heat and emits heat at a high temperature, the temperature detector is Since the heat collecting part in contact is made of a material having high thermal conductivity, the heat transfer speed due to the abnormal temperature rise is fast, the heat transfer to the temperature detector is fast, and the temperature detector operates quickly.

  The light source device of the present invention is a light source device including a housing that houses a light source, and the housing is open on the front side and the rear side in the irradiation direction of the light source, and is fitted to the rear side to A heat collecting part that collects ambient heat heated by the light source, and a temperature detection part that detects the temperature of the heat collecting part in contact with the heat collecting part. The heat section is made of a material having a higher thermal conductivity than that of the casing, and is provided so as to surround the light source.

  In the light source device having such a configuration, when a cooling fan that cools the light source fails due to a light source that generates heat and emits heat at a high temperature, for example, when the housing temperature rises abnormally, the temperature detector is brought into contact with the light source device. The heat collector is made of a material with high thermal conductivity and is fitted to the housing, so heat due to an abnormal temperature rise of the housing is easily transferred to the heat collector, and the heat transfer speed of the heat collector is high. The heat transfer to the temperature detector becomes faster and the temperature detector operates faster.

  The light source device of the present invention is characterized in that the heat collecting part is substantially U-shaped when viewed from the side in the irradiation direction of the light source.

  In the light source device of the present invention having such a configuration, heat transmitted by natural convection is efficiently collected.

  The light source device of the present invention is characterized in that the heat collecting part has a substantially U-shape in a side view and a lateral cross section in the irradiation direction of the light source.

  In the light source device of the present invention having such a configuration, not only heat transmitted by natural convection but also radiant heat is efficiently collected.

  The light source device of the present invention is characterized in that the heat collecting part is made of a material having a higher thermal diffusivity than the casing.

  In the light source device of the present invention having such a configuration, the temperature rise of the heat collecting part is accelerated faster than the temperature rise of the casing around the light source, and the operation of the temperature detector in contact with the heat collecting part is accelerated.

  In the light source device of the present invention, the heat collecting part is surface-treated so as to have a higher emissivity than an inner wall of the casing.

  In the light source device of the present invention having such a configuration, the temperature rise of the heat collecting part is accelerated faster than the temperature rise of the light source peripheral casing, and the operation of the temperature detector in contact with the heat collecting part is accelerated.

  The light source device of the present invention is characterized in that the heat collecting part has a thermal conductivity at 100 ° C. of 50 W / (m · K) or more.

  In the light source device of the present invention having such a configuration, when the circulating fan that cools the light source fails due to a light source that generates heat and emits heat at a high temperature, the temperature detector is Since the heat collecting part in contact is made of a material having high thermal conductivity, the heat transfer speed due to the abnormal temperature rise is fast, the heat transfer to the temperature detector is fast, and the temperature detector operates quickly.

  The light source device of the present invention is characterized in that the heat collecting part is made of aluminum, copper, or an alloy containing aluminum or copper as a main material.

  In the light source device of the present invention having such a configuration, when the temperature around the light source rises abnormally, the heat collecting unit collects heat and quickly conducts the heat to the temperature detector.

  In the light source device of the present invention, the heat collecting part is formed of a graphite sheet.

  In the light source device of the present invention having such a configuration, the graphite sheet has a thermal conductivity anisotropy such that the thermal conductivity is high in the plane direction and the thermal conductivity is not so high in the thickness direction. Collect more effectively.

  In the light source device of the present invention, the heat collecting unit is a heat plate using latent heat of vaporization.

  In the light source device of the present invention having such a configuration, due to a rise in temperature around the light source, the working fluid of a heat pipe disposed in a meandering manner in the heat plate heats and evaporates (latent heat absorption) to generate steam. Moves to the low temperature part, condenses in the low temperature part (latent heat release), dissipates heat from the plate wall, and the working fluid returns to the evaporation part, so the heat transfer is fast and the heat is transferred to the temperature detector.

  In the light source device of the present invention, the light source is accommodated in the casing so as to irradiate in the lateral direction, and the heat collecting part has an upper part and a lower part respectively facing the top and bottom surfaces of the casing, The upper part and the lower part have the same form.

  In the light source device of the present invention having such a configuration, for example, even if the top and bottom are reversed by the installation method of the light source device, the heat collection efficiency of the heat collection unit does not change, and heat is collected efficiently and heat is conducted quickly.

  A projection display apparatus according to the present invention includes the above-described light source device.

  In the projection type image display device having such a configuration, the temperature detection unit of the light source device quickly detects the abnormal temperature rise, and the light source is turned off.

In the light source device of the present invention, the heat collecting part is made independent of the housing and the heat conductivity of the heat collecting part is made higher than that of the housing. Therefore, for example, a cooling fan that cools the light source fails and the fan rotation stops. In some cases, and in a situation where the light source does not turn off due to any problem with the temperature detection function, the temperature detector operates as a last safety device and turns off, but the operating speed of the temperature detector can be improved. It has the effect of being able to.
Therefore, it is possible to minimize the thermal damage of the peripheral parts of the light source, for example, the high-intensity discharge lamp, and to reduce the number of parts for replacing the failed parts.

In the light source device of the present invention, the heat collecting portion fitted to the rear side of the housing is a part of the housing, and the heat conductivity of the heat collecting portion is higher than that of the housing. The heat generated by the rise can be easily transferred to the heat collecting section, and the heat collection can be efficiently performed, the heat conduction of the heat collecting section can be accelerated, and the operating speed of the temperature detector can be improved.
Therefore, it is possible to minimize the thermal damage of the peripheral parts of the light source, for example, the high-intensity discharge lamp, and to reduce the number of parts for replacing the failed parts.

  The light source device of the present invention has an effect that heat generated by natural convection can be efficiently collected because the heat collecting portion has a substantially U-shaped side view in the irradiation direction.

  Since the light source device of the present invention has a substantially U-shaped irradiation side view and lateral cross section of the heat collecting part, it is possible to efficiently collect not only heat transmitted by natural convection but also radiant heat. Have

  In the light source device of the present invention, since the heat collecting part is made of a material having a higher thermal diffusivity than the housing, the temperature rise of the heat collecting part can be made faster than the temperature rise of the housing around the light source. The operation of the temperature detector can be speeded up.

  In the light source device of the present invention, since the heat collecting part is surface-treated so as to have a higher emissivity than the inner wall of the housing, the temperature rise of the heat collecting part is made faster than the temperature rise of the housing around the light source. As a result, the operation of the temperature detector can be speeded up.

  The light source device of the present invention has an effect that heat conduction due to an abnormal temperature rise of the light source can be accelerated because the heat conductivity at 100 ° C. of the heat collecting part is 50 W / (m · K) or more.

  In the light source device of the present invention, since the material of the heat collecting part is aluminum, copper, or an alloy mainly composed of aluminum or copper, the heat conduction is very good, and the effect that heat can be quickly transmitted to the temperature detector. Have.

  In the light source device of the present invention, since the heat collecting part is formed of a graphite sheet, the heat anisotropy that the heat conductivity in the surface direction of the graphite is high causes more heat from natural convection in the surface direction of the heat collecting part. It has the effect that it can collect effectively.

  The light source device of the present invention has an effect that the heat collecting part is a heat plate that uses latent heat of vaporization, so that heat transfer is fast and heat can be transferred to the temperature detector quickly.

  In the light source device of the present invention, the upper and lower portions of the heat collecting portion facing the top and bottom surfaces of the casing have the same form. There is an effect that heat is collected efficiently and heat can be conducted quickly.

  Since the projection type image display apparatus of the present invention includes the light source apparatus of the present invention, the temperature detection unit can quickly detect an abnormal temperature rise and can quickly turn off the light source.

Hereinafter, preferred embodiments of the light source device of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is an external view showing Embodiment 1 according to the light source device of the present invention. FIG. 2 is an exploded perspective view showing the light source device according to the first embodiment. 3 is a cross-sectional view taken along the line AA shown in FIG. FIG. 4 is an external perspective view showing the heat collecting section according to the first embodiment.
In the light source device 10 according to the first embodiment, the high-intensity discharge lamp 11 is accommodated in a rectangular casing 19 composed of an outer wall portion 12, an inner wall portion 20, and a front wall 22. A side wall 15 having the inner cooling fins 13 and the outer cooling fins 14 covering the inner wall, a back wall 18 having the inner cooling fins 16 and the outer cooling fins 17 covering the back surface of the housing 19, and the inner wall portion 20 form an air circulation path. Formed (see FIGS. 2 and 3). On the other side surface of the housing 19, a circulation fan 21 that circulates air to the air circulation path and a duct 26 that is connected to the exhaust port 24 of the circulation fan 21 are provided. Are connected to one ventilation portion 41 of the ventilation portions 41 and 43 provided at locations facing each other (see FIG. 3).
The high-intensity discharge lamp 11 is fixed to the inside of the housing 19 of the front wall 22 with screws (see FIG. 4).

  As described above, in the light source device 10 according to the first embodiment, the air introduced from the ventilation part 41 by the circulation fan 21 passes through the high-intensity discharge lamp 11 to cool the lamp bulb 38 and exits from the ventilation part 43. And a circulation path that circulates through the side portion of the casing 19 including the outer wall portion 12, the inner wall portion 20, and the front wall 22.

As shown in FIG. 2, the light source device 10 according to the first embodiment includes a heating protection component that is a temperature detection unit such as a bimetal and a thermal fuse, and a heat collecting unit 28 that attaches the heating protection component and collects heat, and has an inner wall A bimetal 50 as a heat protection component is installed in a gap 30 formed between the back portion 29 of the portion 20 and the heat collecting portion 28. The gap 30 may be about the size of the heat protection component attached to the heat collecting unit 28, and may be about the thickness of the bimetal, for example.
In FIG. 2, reference numeral 23 denotes an outer cooling fin, reference numeral 25 denotes an attachment hole for fixing the inner wall portion 20 to the outer wall portion 12 with screws, and reference numeral 27 denotes a duct fin. The attachment hole 25 is also an attachment hole for fixing the heat collecting portion 28 to the outer wall portion 12 together with the inner wall portion 20 with screws.

Although the heat collection part 28 is fixed to the inner wall part 20, in order to make the heat collection part 28 thermally independent, that is, thermally insulated, it is fixed through a heat insulating material (not shown) having low thermal conductivity. It is desirable to do.
Therefore, the heat collection unit 28 is fixed to the housing 19 via a heat insulating material having a low thermal conductivity, and becomes thermally independent from the housing 19. Heating of the casing 19 due to conduction to the body 19 can be suppressed.

As shown by the arrows in FIG. 3, in the first embodiment, air is circulated by the circulation fan 21 in the air circulation path formed by the inner cooling fins 13 and 16 and the inner wall portion 20 of the side wall 15 and the back wall 18. The high-intensity discharge lamp 11 is cooled.
The high-intensity discharge lamp 11 includes a lamp bulb 38 having sealing portions 32 and 34 in which electrodes 31 and 33 for generating discharge are embedded, a chamber portion 36 in which mercury and argon gas are sealed, and a concave shape. The reflecting mirror 42 and the structure in which the front surface of the reflecting mirror 42 is sealed with a disc-shaped explosion-proof glass 44 are provided, and power is supplied from the block 46 to the electrodes 31 and 33.

In the light source device 10 according to the first embodiment, the heat collecting unit 28 is provided so as to cover the back surface of the reflecting mirror 42 together with the inner wall unit 20 (see FIG. 3), and near the block unit 46 on the rear side of the lamp bulb 38. The bimetal 50 as a heat protection component is installed through the heat collecting unit 28 (see FIGS. 3 and 4).
In the example shown in FIG. 4, the heat collecting unit 28 is a substantially U-shaped side view in the irradiation direction of the light source, and has a rectangular shape in which the shapes of the upper part and the lower part respectively facing the top and bottom surfaces of the housing 19 are the same. The back surface 56 is also rectangular, and the bimetal 50 is provided at the approximate center of the back surface 56. When the heat collection part 28 is a metal plate, the attachment collar 53 of the bimetal 50 is fixed to the heat collection part 28 with screws 51 and 51, for example.
Thus, since the shape of the heat collecting part 28 facing both the top and bottom surfaces of the housing 19 is symmetrical, even if the housing 19 is turned upside down by the installation method of the light source device, the heat collecting part 28 The effect can be the same.
3 and 4, reference numeral 52 indicates a lead wire. Hereinafter, the same reference numeral indicates the same member.

The heat collection unit 28 covers the high-intensity discharge lamp 11 along the natural convection direction of air. In the examples shown in FIGS. 2 to 4, the side view of the light source in the irradiation direction is substantially U-shaped. A box shape covering the reflecting mirror side of the luminance discharge lamp 11 may be used. When the heat collecting part 28 is box-shaped, the side view in the irradiation direction and the transverse section are U-shaped.
The heat collector 28 may be any structure that effectively collects the radiant heat of the high-intensity discharge lamp 11 and the heat generated by the convection. Good.

  In the first embodiment, for a temperature abnormality that can normally occur, the temperature abnormality is detected, and a heat protection component such as a bimetal whose function is restored after the cause is removed and the temperature is cooled is used. A thermal fuse may be installed.

FIG. 5 is an external perspective view showing a heat collecting section in the light source device according to Embodiment 1. FIG.
In the light source device 10 according to the present embodiment, the heat collecting portion 28 is a member from the housing 19 and the irradiation direction side view independent is a substantially U-shaped structure. That is, the heat collecting unit 28 is a separate member from the housing 19 and is formed of a material or structure having a higher thermal conductivity than the housing 19. In the case of a metal, the material having a high thermal conductivity is, for example, an alloy mainly composed of silver, copper, gold, and aluminum, and aluminum is particularly preferable because of its low cost.
As such a metal material, for example, the thermal conductivity at 100 ° C. may be 50 W / (m · K) or more and 450 W / (m · K) or less.

Since it is assumed that the bimetal 50 operates by heat conduction from the mounting surface, heat is quickly conducted from the tip of the heat collecting section 28 (above the casing) to the mounting section 54 to which the heat protection component such as the bimetal 50 is mounted. is important.
In the example shown in FIG. 5, the bimetal 50 is provided on the attachment portion 54 at the substantially center of the rectangular back surface 56 of the heat collecting portion 28.

  When the bimetal 50 is provided at substantially the center of the rectangular back surface 56 of the heat collecting unit 28, the heat collecting effect of the heat collecting unit 28 is the same even if the light source device 10 is installed upside down.

  In addition, when attaching a thermal fuse to the attachment part 54, the recessed fitting part which a thermal fuse fits in an attachment part is provided. The fitting portion may be in the shape of a long hole that fits in accordance with the shape of the thermal fuse. Thus, the fitting portion is not limited to the thermal fuse, and may be formed and fitted according to the form of the heat protection component.

By the way, the graphite sheet developed using graphite as a raw material as a non-metallic material has a thermal conductivity anisotropy in which the thermal conductivity is high in the plane direction and the thermal conductivity is not so high in the thickness direction. Since the surface direction has a higher thermal conductivity than aluminum and a lower specific gravity, it has the same size and less than half the heat capacity as compared with aluminum or copper, and is characterized by a high heat transfer rate.
Therefore, it is desirable to form the heat collecting part 28 to which the bimetal 50 of the heat protection component is attached with a graphite sheet.

Further, a plate-like heat plate structure using latent heat of vaporization may be used as the structure of the heat collecting unit 28.
Some heat plates have more than five times the thermal conductivity of silver, and there are also examples that have a thermal conductivity of 5000 W / (m · K).

  In such a heat plate, a heat pipe meandering on a metal material is arranged, and heat transfer is performed by a sealed hydraulic fluid and a phase change. In the heat pipe, the working fluid receives heat and evaporates (latent heat absorption), the steam moves to the low temperature part, condenses in the low temperature part (latent heat release), dissipates heat from the tube wall, and the working liquid returns to the evaporation part. It is what I did.

FIG. 6 is a perspective view showing a modification of the heat collecting section according to the first embodiment.
In the example shown in FIG. 5, the side view in the irradiation direction is substantially U-shaped, and the front and side surfaces are open, but the side view in the irradiation direction and the cross section in the lateral direction are substantially U-shaped as shown in FIG. 6. A box shape may be used so that only the front surface is opened.
When such a heat collecting part 28 is box-shaped, not only heat by natural convection but also radiant heat can be collected efficiently.

FIG. 7 is a perspective view showing a structure for attaching a bimetal to a graphite heat collecting section according to the first embodiment. FIG. 8 is a perspective view showing a structure in which a bimetal is attached to the heat plate type heat collecting portion according to the first embodiment.
As shown in FIG. 7, when the heat collecting portion 28 cannot be screwed directly with a graphite sheet or a heat plate, the bimetal 50 is attached to the screw holes 61, 61 of the screw pilot hole fitting 59 via the mounting holes 57, 57. The mounting collar 53 is screwed.
Further, as shown in FIG. 8, in the case of the heat collecting portion 28 in which the mounting hole cannot be opened with a heat plate or the like, the bimetal 50 is pressure-bonded by the pressure-bonding bracket 65 having the pressure-bonding claws 63. Fix it.

By the way, since heat due to natural convection is generated in the vertical direction, the heat tends to accumulate upward, and the temperature of the upper part of the heat collecting section 28 becomes high. Therefore, it is preferable to install the bimetal 50 near the upper part.
In the example shown in FIG. 8, the bimetal 50 is configured such that the crimping claws 63 of the crimping bracket 65 are temporarily fastened to the heat collecting portion 28, the crimping bracket 65 can be slid in the vertical direction, and the mounting position can be adjusted. The crimping claw 63 is finally tightened and fixed at a predetermined position.
Therefore, in the example shown in FIG. 8, when the light source device 10 is installed and the top of the housing 19 is reversed, the bimetal 50 can be slid and fixed above the heat collecting unit 28, Heating can be detected quickly.

  In addition, FIG. 9 is a table | surface which shows the thermal-related physical property value of the main material of the heat collecting part in 100 degreeC. The physical property value of the graphite sheet is slightly different depending on the manufacturer, but it is a physical property value as shown in FIG.

By the way, in a state where the inner wall of the housing 19 has a high emissivity (using a black fabric color of high heat-resistant plastics or the like), the inner wall of the housing 19 can easily receive the radiant heat from the lamp bulb 38. The higher the emissivity on the high-intensity discharge lamp 11 side, the higher the temperature rise rate of the heat protection component.
Therefore, when the heat collection part 28 is a metal material, it is preferable to perform surface treatment such as painting or dyeing to increase the emissivity.
As an example of the coating surface treatment, it is possible to use a black baked painted metal that forms a black film on the metal surface and performs the treatment by applying heat. Moreover, as an example of the dyeing surface treatment, it is preferable to use black alumite obtained by black-dying aluminum by anodizing a film.

In order to simply confirm the effect of the first embodiment, there is an equation for obtaining a temperature after time t when a certain material starts to generate heat with a heating value W, and is expressed by the following equation.
Temperature rise after t seconds [° C.] = thermal resistance [° C./W]×calorific value [W] × {1-exp (−t / time constant)}
here,
Heat capacity [J / ° C.] = Volume [m ³ ] × Specific heat [J / (g · ° C.)] × Specific gravity [g / m ³ ]
Time constant [s] = Thermal resistance [° C / W] x Heat capacity [J / ° C]
Thermal diffusivity [m ² / s] = thermal conductivity [W / (m · K)] / {specific heat [J / (g · ° C.)] × density [g / m ³ ]}
Therefore, it can be seen that the thermal diffusivity and the heat capacity are inversely proportional.

Thermal diffusivity [m ² / s] ∝1 / Heat capacity [J / ° C]
It can be seen that when the thermal diffusivity is large, the temperature rise after t seconds is large.
Therefore, the heat collection part 28 is preferably made of a material having a thermal conductivity or thermal diffusivity equivalent to or higher than that of aluminum (see FIG. 9).

  In the light source device 10 according to the first embodiment having such a configuration, the circulation fan 21 fails and the housing 19 becomes abnormal due to heat of the lamp bulb 38 that generates heat at a high temperature and heat radiation that passes through the reflecting mirror 42. When the temperature rises, the heat collection unit 28 is made of a material having high thermal conductivity, so that the heat transfer rate is fast, and the heat transfer to the bimetal 50 of the heat protection component that is the temperature detection unit is fast.

  Therefore, the light source device 10 according to the first embodiment is a case where the circulation fan 21 (cooling fan, for example, see FIG. 3) set around the high-intensity discharge lamp 11 fails and the rotation of the fan is stopped. In a situation where the luminance discharge lamp 11 is not extinguished, the bimetal 50 is activated and extinguished as the last safety device, but the temperature rise rate of the mounting portion 54 of the bimetal 50 can be improved and the bimetal 50 can be operated quickly. The high-intensity discharge lamp 11 can be quickly turned off.

  As described above, since the bimetal 50 of the heat protection component operates quickly and quickly turns off the high-intensity discharge lamp 11, thermal damage such as thermal deformation of peripheral parts of the high-intensity discharge lamp 11 and gas generation of plastic parts is minimized. As a result, the number of failed parts can be reduced.

In the first embodiment described above, the heat collecting portion 28 is provided inside the inner wall portion 20, that is, inside the housing 19, but is provided as a part of the housing surrounding the rear portion of the high-intensity discharge lamp 11. Also good.
FIG. 10 is a schematic partial cross-sectional view of the main part of the light source device in which the heat collecting part forms part of the housing.
The light source device 10 includes a housing 62 that surrounds the periphery of the high-intensity discharge lamp 11 and exposes the front surface thereof, and a collection of substantially U-shaped in a side view in the irradiation direction that surrounds the back of the high-intensity discharge lamp 11. The heat collecting part 28 constitutes a part (rear wall) of the housing 62. The heat collector 28 can be fitted by sealing the rear opening 66 of the housing 62.
The high-intensity discharge lamp 11 is supported by a bracket (not shown) in the housing 62.

  In the light source device having such a configuration, the bimetal 50 is attached in the case where, for example, a cooling fan that cools the light source fails due to a light source that generates heat and emits heat at a high temperature, and the housing 64 has an abnormal temperature rise. Since the heat collector 28 is made of a material having high thermal conductivity and is fitted to the housing 62, heat due to an abnormal temperature rise of the housing 62 is easily transferred to the heat collector 28, and the heat of the heat collector 28 is The moving speed is fast, the heat transfer to the bimetal 50 is fast, and the bimetal 50 operates fast.

Therefore, such a light source device can easily transfer heat due to an abnormal temperature rise of the housing 62 to the heat collecting unit 28, collect heat efficiently, speed up heat conduction of the heat collecting unit, and a temperature detector. The operating speed can be improved.
In addition, it is possible to minimize the thermal damage to the peripheral components of the high-intensity discharge lamp 11 and to reduce the number of parts for replacement of a faulty part.

In the example shown in FIG. 10, the heat collecting portion 28 is directly fitted to the housing 62. However, in order to make the heat collecting portion 28 thermally independent from the housing 62, a plate-like shape having a low thermal conductivity is used. You may make it fit through a heat insulating material (not shown).
Further, as shown in FIG. 6, a heat collecting portion 28 having a substantially U-shaped structure in a side view in the irradiation direction and in a lateral cross section may be used.
In FIG. 10, dotted arrows indicate radiant heat that passes through the reflecting mirror 42, and arrows indicate the direction of heat conduction.

(Embodiment 2)
FIG. 11 is a schematic view showing a video display device including the light source device of the present invention.
The video display device 70 includes the light source device 10 of the present invention, and condenses the light of the high-intensity discharge lamp 11 having a structure in which the lamp bulb 38 is attached to the reflecting mirror 42 and the light of the high-intensity discharge lamp 11 on the color wheel unit 72. A condenser lens 74, a rod lens 76 for uniforming the illuminance distribution of each monochromatic light that has passed through the color wheel section 72 divided into the three primary colors of RGB, a relay lens section 78 for transmitting a real image as it is, and a synchronization with each monochromatic light Thus, a reflective image display element 80 that produces a monochrome image and expresses time-division full color and a projection lens 82 are provided.
In addition, in FIG. 11, the code | symbol 71 shows the cooling fan which takes in air from the outside, and the code | symbol 73 shows a mesh-shaped exhaust port.

In such an image display device 70, the white light emitted from the lamp bulb 38 is transmitted by the condenser lens 74 through the color filter on the color wheel unit 72 to improve the quality on the screen. Condensed to The light that has passed through the rod lens 76 and the relay lens unit 78 is selectively reflected by the video display element 80 in accordance with the video signal. The reflected light is imaged on the screen by the projection lens 82 to display an image.
When the high-intensity discharge lamp 11 is lit, cooling air from the cooling fan 71 cools the high-intensity discharge lamp 11 and exits from the mesh-shaped exhaust port 73.

At this time, when the high-intensity discharge lamp 11 that generates heat and emits heat at a high temperature, for example, when the cooling fan 71 that cools the light source fails and the housing 19 rises to an abnormal temperature, the bimetal 50 that is a temperature detector. Since the heat collecting part 28 to which is attached is made of a material having a high thermal conductivity, the heat transfer speed due to the abnormal temperature rise is fast, the heat transfer to the bimetal 50 is fast, and the bimetal 50 operates fast.
Then, the high-intensity discharge lamp 11 is turned off by the operation of the bimetal 50.

  Therefore, in the video display device according to the second embodiment, when the temperature of the light source rises abnormally, the heat collecting part efficiently transfers heat, and the temperature detector can be operated quickly. Thermal damage can be minimized and the number of parts for failed parts replacement can be reduced.

  In the second embodiment, the projection type video display device having the color wheel unit is taken as an example of the video display device including the light source device of the present invention. However, the present invention is not limited to this. A liquid crystal projector that obtains a large screen by transmitting through a panel combining a liquid crystal shutter and three primary color filters and projecting it may be used.

It is an external view which shows Embodiment 1 which concerns on the light source device of this invention. 1 is an exploded perspective view showing a light source device according to Embodiment 1. FIG. It is AA sectional drawing shown in FIG. 3 is an external perspective view showing a heat collecting unit according to Embodiment 1. FIG. 3 is an external perspective view showing a heat collecting part in the light source device according to Embodiment 1. FIG. FIG. 6 is a perspective view showing a modification of the heat collection unit according to Embodiment 1. It is a perspective view which shows the structure which attaches a bimetal to the heat collecting part made from graphite which concerns on Embodiment 1. FIG. 3 is a perspective view showing a structure for attaching a bimetal to a heat plate type heat collecting section according to Embodiment 1. FIG. It is a table | surface which shows the thermal related physical property value of the main material of the heat collecting part in 100 degreeC. It is a general | schematic principal part partial sectional view which shows the light source device which the heat collecting part comprised a part of housing | casing. It is the schematic which shows a video display apparatus provided with the light source device of this invention. It is a general | schematic fragmentary sectional view which shows the light source device of the conventional projector by which only one heating protection component was arrange | positioned. It is a general | schematic fragmentary sectional view which shows the light source device of the conventional projector with which two heat protection components were arrange | positioned (stationary installation). It is a general | schematic fragmentary sectional view which shows the light source device of the conventional projector with which two heat protection components were arrange | positioned (ceiling installation).

Explanation of symbols

10 Light source device 11 High-intensity discharge lamp (light source)
19, 62, 64 Housing 28 Heat collection unit 30 Air gap 50 Bimetal (temperature detection unit)

Claims (12)

In a light source device including a housing that encloses and houses the light source except the irradiation path of the light source,
A heat collecting part for collecting ambient heat heated by the light source;
A temperature detector that contacts the heat collector and detects the temperature of the heat collector;
Have
The heat collecting part is made of a material having a higher thermal conductivity than the case, and is provided inside the case with a gap and a gap so as to surround the light source. Light source device. In a light source device including a housing that houses a light source,
The casing is open on the front side and the rear side in the irradiation direction of the light source,
A heat collecting part that collects the ambient heat heated by the light source, and forms a part of the housing by fitting to the rear side;
A temperature detector that contacts the heat collector and detects the temperature of the heat collector;
Have
The light source device, wherein the heat collecting part is made of a material having a higher thermal conductivity than the casing and is provided so as to surround the light source.   3. The light source device according to claim 1, wherein the heat collecting unit is substantially U-shaped when viewed from the side in the irradiation direction of the light source.   3. The light source device according to claim 1, wherein the heat collecting unit has a substantially U-shaped side view and a lateral cross section in the irradiation direction of the light source.   The light source device according to claim 1, wherein the heat collection unit is made of a material having a higher thermal diffusivity than the housing.   6. The light source device according to claim 1, wherein the heat collection unit is surface-treated so as to have a higher emissivity than an inner wall of the housing.   The light source device according to claim 1, wherein the heat collecting unit has a thermal conductivity at 100 ° C. of 50 W / (m · K) or more.   The light source device according to any one of claims 1 to 7, wherein the heat collecting unit is made of aluminum, copper, or an alloy mainly composed of aluminum or copper.   The light source device according to claim 1, wherein the heat collection unit is formed of a graphite sheet.   The light source device according to claim 1, wherein the heat collecting unit is a heat plate that uses latent heat of vaporization. The light source is accommodated in the housing so as to irradiate laterally,
The said heat collection part has an upper part and a lower part which respectively oppose the top and bottom surfaces of the said housing | casing, and this upper part and the lower part are the same forms, The Claim 1 characterized by the above-mentioned. Light source device.   A projection-type image display apparatus comprising the light source device according to any one of claims 1 to 11.

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