JP2005275150A - Lamp unit and radiator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To resolve the problem that a cooling effect is not sufficient because a light shielding plate which is provided in the vicinity of an exhaust fan for cooling a lamp, as measures against leakage of light of the lamp to the outside from the exhaust fan shields not only light but also exhausted air flow. <P>SOLUTION: A radiator is provided at an air exhaust port of a housing. A radiation fin of the radiator is attached so as to be inclined or deformed to shield light of the lamp. Thus not only light leaked from the lamp is considerably reduced but also a radiation function can be improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lamp unit and a radiator used in a video display device such as a projector device.

  The projector device guides light obtained from a light source to an optical system to generate image light, and enlarges and projects the image light on a screen. A lamp housed in a lamp unit is used as the light source.

  FIG. 6 is a cross-sectional view showing an example of the lamp unit 30 employed in the projector apparatus.

  As shown in FIG. 6A, the lamp 22 is housed in the housing 21 and is configured by disposing the light emitting portion 22a at the focal position of the reflector 22b, and radiates high-luminance white light forward.

  The housing 21 has a plurality of air intake ports 24 for taking in air for cooling the lamp. An air discharge port 25 is opened behind the housing 21, and an exhaust fan 26 is attached to the air discharge port 25.

  When a high-intensity lamp such as an ultra-high pressure mercury lamp is employed in the lamp unit 30 described above, the lamp 22 generates a large amount of heat. In particular, the light emitted from the light emitting portion 22a passes through the reflector 22b, and the inner peripheral wall of the housing 21. Therefore, the inside of the housing 21 becomes high temperature.

  For this reason, the exhaust fan 26 is rotationally driven to take in air from the plurality of air intake ports 24, pass through the periphery of the lamp 22, and then discharge to the outside through the exhaust fan 26. The lamp 22 is cooled by this air flow (see, for example, Patent Document 1).

Further, in the lamp unit 30 as described above, since the light from the lamp 22 leaks from the exhaust fan 26 for cooling, a light shielding plate 27 is attached in the vicinity of the exhaust fan 26 as shown in FIG. Is also known.
Japanese Patent No. 3462863

  In the structure of FIG. 6A, the light from the lamp 22 leaks from the exhaust fan 26 for cooling, which hinders image light to be enlarged and projected. On the other hand, when the light shielding plate 27 is provided as shown in FIG. 6B, light does not leak but the flow of air is also hindered. In this case, heat radiation is hindered. For this reason, it is necessary to rotate the exhaust fan at a higher speed, which causes a problem of noise of the equipment.

  In recent years, the amount of heat generated tends to further increase as the lamp brightness increases. However, for example, when considering a case in which a heat radiator that dissipates heat with a large surface area is provided separately, the apparatus goes counter to downsizing. Further, since the light shielding plate and the radiator are provided in the vicinity of the exhaust fan, the flow resistance in the exhaust fan portion increases, and the increase in the air volume of the exhaust fan causes a problem of preventing noise reduction.

  The present invention has been made in view of such problems. First, a housing that houses a lamp that serves as a light source, at least one air intake opening and at least one air discharge opening provided in the housing, and the vicinity of the air discharge opening. An exhaust fan that is mounted and generates an air flow in the housing to cool the lamp, and a radiator that is mounted in the vicinity of the air outlet and has a heat absorbing portion and a plurality of heat radiating fins attached thereto. And solving the problem by shielding light leakage from the lamp by the radiating fin.

  Further, the radiating fin is provided to be inclined at an angle that blocks an optical path from the light source.

  In addition, the heat radiating fin is deformed into a shape that blocks an optical path from the light source.

  Further, the radiator is formed by connecting the heat absorbing part to a bottom part of the heat radiating part, the heat absorbing part is constituted by a first flat plate type heat pipe, and the heat radiating part includes second ends of the heat radiating fins. The flat type heat pipe is fixed to a bent side wall and is configured.

  Further, the endothermic portion extends in the vicinity of the lamp and is bent along the shape of the lamp.

  Second, an endothermic part constituted by the first flat plate type heat pipe, a side plate and a bottom part formed by bending the second flat plate type heat pipe, and a heat radiating part having a plurality of radiating fins attached to the side wall, This is solved by blocking the light path from the light source arranged in the vicinity by the heat dissipating fins.

  The heat absorbing portion is connected to the bottom portion of the heat radiating portion, and the heat radiating fin is deformed or attached to the bottom portion at an angle.

  According to the present invention, first, it is possible to provide a lamp unit that prevents light leakage from a light source and has improved heat dissipation. Since the heat radiating fins of the radiator are used as the light shielding plate, the heat radiation effect is increased even with the same air flow rate as compared with the case of using only the light shielding plate. In other words, even if the flow rate of air is reduced, the same heat dissipation effect as in the prior art can be obtained, so that the number of revolutions of the exhaust fan can be reduced, and noise is reduced.

  Secondly, in the lamp unit, the radiator has both a heat radiation function and a light shielding function, so that the number of parts can be reduced and the apparatus can be downsized as compared with the case where the heat radiator and the light shielding plate are individually mounted.

  Thirdly, in the lamp unit, the heat dissipating fins that block the light need only be tilted and attached, so that light leakage that hinders image light can be easily prevented.

  Fourth, by deforming the heat dissipating fins, the lamp unit has sufficient light shielding for the user viewing at any position, and the light shielding function is enhanced.

  Fifth, the radiator is composed of the first and second flat plate heat pipes and the radiation fins, and can efficiently transmit the radiant heat from the lamp to the radiation fins. It is possible to provide a lamp unit that can sufficiently absorb heat and transport heat even when the flow rate of air is somewhat reduced.

  Sixth, it is possible to provide a lamp unit in which the endothermic part of the radiator is curved so as to follow the curved surface of the lamp, thereby improving the endothermic efficiency of radiant heat from the lamp.

  Seventh, it is possible to provide a radiator that prevents light leakage from a light source disposed in the vicinity and has improved heat dissipation. The radiator is composed of the first and second flat plate heat pipes and the radiation fins, and can perform sufficient heat absorption and heat transport.

  Eighth, the heat dissipating fins need only be deformed or tilted with respect to the bottom, and a heat radiator with a light shielding function can be easily realized.

  The lamp unit 15 according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5 by taking the projector device 20 as an example.

  First, a first embodiment will be described with reference to FIGS.

  FIG. 1 is a perspective view showing the entire projector apparatus 20. 1A is an external view, and FIG. 1B is a perspective view showing a schematic diagram of the internal structure.

  As shown in the figure, the projector device 20 includes a flat casing 11 composed of an upper half case 11a and a lower half case 11b. A wind exhaust hole 13 is provided. In the first embodiment, the lamp unit 15 is exhausted from the side exhaust holes 13 when the projection window 12 is the front surface. In addition to the lamp unit 15, the casing 11 is provided with an optical unit 14 for generating a color image. The optical unit 14 includes a cooling unit (not shown) for cooling.

  The lamp unit 15 will be described with reference to FIG. 2A is a perspective view of the entire lamp unit 15, FIG. 2B is a perspective view showing an internal structure excluding the housing, and FIG. 2C is an AA view of FIG. 2A. It is sectional drawing by a line.

  The lamp unit 15 includes a housing 8, an air inlet 9, an air outlet 10, an exhaust fan 7, and a radiator 5. In the projector device 20 of the present embodiment, an ultra-high pressure mercury lamp 6 accommodated in a rectangular parallelepiped housing 8 is used as a light source as shown in FIG. 2A, and the lamp 6 is a focal position of the reflector 6b. The light emitting portion 6a (FIG. 2C) is arranged on the top.

  In the housing 8, a plurality of air intake ports 9 are opened above the lamp 6, and at least one air discharge port 10 is opened at a side surface position of the lamp 6. An exhaust fan 7 is installed.

  The radiator 5 includes a heat absorbing portion 1 made of a first flat plate heat pipe, and a heat radiating portion 2 constituted by a second flat plate heat pipe 3 and heat radiating fins 4. Here, it is assumed that the heat radiating fins 4 are attached at a predetermined angle with respect to a plane parallel to the bottom of the heat radiating unit 2 so as to block the optical path from the lamp 6.

  And only the heat absorption part 1 is arrange | positioned inside the housing 8 in the heat radiator 5, and the heat absorption part 1 is curving in the shape along the circumference | surroundings of the lamp | ramp 6. FIG. With this shape, the radiant heat from the lamp 6 can be effectively absorbed. The details of the radiator 5 will be described later.

  To cool the inside of the housing 8, first, the exhaust fan 7 is driven to rotate, air is taken in from a plurality of air intakes 9, passed around the lamp 6, and then discharged to the outside through the exhaust fan 7. The lamp 6 is cooled by this air flow. Further, the radiant heat generated by the lamp 6 is absorbed by the heat absorbing portion 1 and efficiently transmitted to the heat radiating fins 4 by the refrigerant. The heat transmitted to the heat radiating fins 4 is radiated to the outside by the air passing through the heat radiating fins 4 by the rotational drive of the exhaust fan 7. That is, the cooling efficiency can be further increased by the air flow caused by the rotational drive of the exhaust fan 7 and the forced cooling by the radiator 5.

  Furthermore, since the radiation fins 4 are attached so as to block the optical path from the lamp 6, the light leaking from the lamp 6 to the outside together with the air flow from the exhaust fan 7 can be significantly suppressed. Since the arrangement of the exhaust fan 7 communicates directly with the outside through the exhaust hole 13 as shown in FIG. 1B, the image light can be projected more clearly and sharply by significantly suppressing the light leaking from here. Thus, the performance of the projector device 20 can be sufficiently obtained.

  FIG. 3 shows a radiator of this embodiment. 3A is a perspective view of the radiator, FIG. 3B is a side view in the a direction, and FIG. 3C is a side view in the b direction.

  The heat radiator 5 includes a heat absorbing portion 1 and a heat radiating portion 2, and the heat absorbing portion 1 is connected to the bottom 3 b of the heat radiating portion 2. The heat absorbing part 1 is composed of a first flat plate heat pipe in which a liquid (or gas) is enclosed, and the heat absorbing part 1 is curved. With this shape, the heat absorbing portion 1 can be arranged along the curved surface of the lamp 6.

  In particular, in the arrangement of the first embodiment, as shown in FIG. 2, the heat absorbing portion 1 can be arranged so as to surround the lamp 6, so that the heat absorption efficiency of the radiant heat transmitted through the reflector 6b can be increased.

  The heat radiating part 2 bends the strip-shaped second flat plate-type heat pipe 3 several times in the longitudinal direction to constitute a side wall 3a and a bottom part 3b. In other words, the heat pipe has a structure in which the side wall 3a and the bottom 3b are continuous, and a structure in which the liquid (or gas) sealed inside can be sufficiently circulated is realized.

  The inside of the first and second flat plate heat pipes is filled with, for example, butane as a refrigerant at a pressure of about 0.48 Mpa (4.7 atm) at room temperature. The refrigerant circulates inside the heat pipe, and the heat absorbed by the heat absorption part (first heat pipe) 1 is transported to the second flat plate heat pipe 3 and radiated to the outside by the air passing through the radiation fins 4. Is done. That is, when other refrigerants are used, a refrigerant in accordance with the operating temperature range that is liquid when absorbing heat and becomes gas when radiating heat is appropriately selected.

  The refrigerant may be a supercritical fluid. A supercritical fluid is a fluid that is different from both a liquid and a gas in which the material changes in an environment above the critical point of the material. Supercritical fluids have physical properties similar to liquids in density and thermal conductivity, and clay has values close to those of gas. Accordingly, a high moving speed can be expected with a low viscosity. Furthermore, dynamic clay is smaller than gas-liquid and has features such as extremely easy convection, and is suitable for heat transport.

  The supercritical fluid includes air, carbon dioxide, hydrogen chloride, water, nitrogen, oxygen, etc., but carbon dioxide has a relatively mild critical condition and is easy to use. Since this critical point temperature is 31.5 ° C. and the critical point pressure is 72.8 atm, it is sealed in the heat pipe under these conditions.

  In the present embodiment, the heat radiating part 2 divided into four parts by the side wall 3a is shown as an example, but the present invention is not limited to this, and the side wall 3a and the bottom part 3b may be configured by continuous heat pipes. .

  The heat radiating part 2 is provided with a large number of heat radiating fins 4. The heat radiating fins 4 have a flat plate shape, and both ends are fixed to and supported by the side wall 3a.

  In the present embodiment, the radiating fins 4 are deformed or attached to the bottom 3b so as to block the optical path from the light source arranged near the top of the heat absorbing unit 2. The radiator 5 radiates heat by passing air through the radiating fins 4 as described above. The fact that the airflow passes through the radiating fins 4 means that when the light source is in the vicinity, the light from the light source also leaks. In this case, the optical path can be blocked by, for example, inclining the radiating fins 4 as shown in the figure, so that the function of a light shielding plate can be added to the radiator 5.

  Here, by attaching the radiation fins 4 so as to block the optical path, it becomes an obstacle to the flow of air passing therethrough. However, in this embodiment, this obstacle has a heat dissipation function, and heat can be transferred efficiently by the contact between the heat dissipation fins 4 and air. That is, the heat dissipation effect is increased even with the same amount of air as compared with the conventional light shielding plate alone.

  In other words, even if the air flow rate is reduced, the same heat dissipation effect as that of the prior art can be obtained, so that the number of revolutions of the exhaust fan 7 can be reduced, and noise generated from the exhaust fan 7 is reduced.

  Further, for example, the present embodiment is also compared with a case where a light shielding plate and a heat sink are separately prepared and provided, that is, compared to a case where a heat radiator is disposed outside or inside the light shielding plate 27 in FIG. It will be advantageous. This is because, in the present embodiment, the radiator 5 has a light shielding function, so that there are fewer obstacles in the air flow path and the flow resistance can be reduced compared with the case where the light shielding plate and the radiator are provided side by side. is there. In other words, the rotational speed of the exhaust fan 7 can also be reduced by this, and the noise of the exhaust fan 7 can be reduced.

  Furthermore, according to the present embodiment, the number of parts can be reduced and the apparatus can be downsized as compared with the case where a radiator and a light shielding plate are provided separately.

  In FIG. 4, the example of attachment of a radiation fin is shown. The figure is an enlarged view of the heat dissipating part of FIG.

  As shown in FIGS. 4 (A) to 4 (C), the heat radiating fin 4 is attached to be inclined at a predetermined angle from a plane parallel to the bottom 3b so as to block the optical path from the light source L disposed in the vicinity. This angle is appropriately selected depending on the position (height direction and distance) of the light source L and the size of the light source L.

  For example, in FIG. 4A, the optical path from the light source L can be blocked except for the user who views in a specific direction (the direction of the arrow). FIG. 4B shows the light source L of FIG. 4A moved in the height direction. By adjusting the position of the light source L, the light path is blocked for the user viewing in any direction. Can do. FIG. 4C shows a case where the position of the light source L shown in FIG. 4A is moved away from the user. By adjusting the distance of the light source L, the optical path is set for the user in any direction. Can be blocked.

  In these cases, since it can be realized simply by tilting and fixing the flat radiating fins 4, the radiator 5 having a light shielding function can be easily implemented.

  Further, as shown in FIGS. 4D to 4F, the flat heat radiating fins 4 may be deformed by bending or the like, and the optical path may be blocked by the deformed portions. In this case, the light path that goes straight from the light source can be blocked by the deformed portion for the user in any direction, which is effective as a light blocking function.

  Next, a second embodiment of the present invention will be described with reference to FIG. Detailed description of the same parts as those in the first embodiment will be omitted.

  FIG. 5A is a perspective view showing the internal structure of the projector device 20, FIG. 5B is a perspective view showing the internal structure of the lamp unit 15, and FIG. Sectional drawing in the BB line of the lamp unit 15 of this is shown.

  In the second embodiment, the lamp unit 15 is exhausted from the projection window 12 side (front surface). That is, the air discharge port 10, the radiator 5 and the exhaust fan 7 of the housing 8 are arranged on the back side of the lamp 6.

  Further, according to this arrangement, the heat absorbing portion 1 of the radiator 5 is curved so as to follow the curved shape of the lamp 6 in the front-rear direction, and is arranged in the housing 8. Thereby, the light from the lamp 6 can be efficiently absorbed.

  When the exhaust fan 7 is rotationally driven, air is sucked into the housing 8 from the plurality of air intakes 9, passes around the lamp 6, and is discharged to the outside through the exhaust fan 7. The lamp 6 is cooled by this air flow. Further, the radiant heat generated by the lamp 6 is absorbed by the heat absorbing portion (first heat pipe) 1, transmitted to the radiating fin 4, and forcibly cooled by the air passing through the radiating fin 4.

  And in this embodiment, since the radiation fin 4 is inclined and attached so as to block the optical path from the lamp 6 as shown in FIG. 5C, the light leaking together with the air flow from the exhaust fan 7 is greatly suppressed. Can do.

  In the second embodiment, the exhaust hole 13 is provided on the back side of the lamp 6, and the arrangement is such that less light leaks to the outside as compared with the arrangement of the first embodiment. That is, the light leaking to the outside can be further reduced by applying the radiator 5 of the present invention.

  By providing the heat sink 5 having the light shielding function in this manner, even if the rotational speed of the exhaust fan 7 is lowered as compared with the conventional case, a sufficient cooling effect can be obtained as a whole. As a result, noise generated from the exhaust fan 7 can be obtained. Is reduced.

  In addition, since light leakage to the outside that hinders the enlarged projection of the image light can be significantly suppressed, the projection function of the projector device 20 can be sufficiently exhibited.

  2 and 5, the radiator 5 is arranged on the suction port side of the exhaust fan 7, but these positions are switched so that the exhaust fan 7 is connected to the radiator 5 and the lamp 6. You may arrange | position between. In this case, since the exhaust fan 7 moves inside, there is an advantage that the noise for the user can be further reduced. However, regarding these arrangements, for example, an optimum arrangement is taken together with other conditions such as a heat dissipation effect and a light shielding effect. Just choose.

  Furthermore, in the present embodiment, the curved heat absorption part 1 has been described as an example, but the heat absorption part 1 may remain in a flat plate shape that is not curved.

It is a perspective view which shows 1st Embodiment of the lamp unit which concerns on this invention. It is (A) perspective view, (B) perspective view, and (C) sectional view for explaining the above embodiment. It is the (A) perspective view, (B) side view, and (C) side view which show the heat radiator concerning the present invention. It is a side view which shows the shape of the radiation fin of the heat radiator which concerns on this invention. It is the (A) perspective view, (B) perspective view, (C) sectional drawing which shows 2nd Example of the lamp unit which concerns on this invention. It is sectional drawing which shows the conventional lamp unit.

Explanation of symbols

1 Endothermic part (first flat plate heat pipe)
DESCRIPTION OF SYMBOLS 2 Thermal radiation part 3 2nd flat plate heat pipe 3a Side wall 3b Bottom part 4 Radiation fin 5 Radiator 6 Lamp 6a Light emission part 6b Reflector 7 Exhaust fan 8 Housing 9 Air intake 10 Air exhaust port 11 Casing 12 Projection window
13 Exhaust hole
DESCRIPTION OF SYMBOLS 14 Optical unit 15 Lamp unit 20 Projector apparatus 21 Housing 22 Lamp 22a Light emission part 22b Reflector 24 Air intake port 25 Air exhaust port 26 Exhaust fan 27 Light-shielding plate 30 Lamp unit

Claims (7)

A housing containing a lamp as a light source;
At least one air intake opening and at least one air discharge opening established in the housing;
An exhaust fan mounted near the air outlet and generating an air flow in the housing to cool the lamp;
A radiator that is mounted near the air discharge port and includes a heat absorbing portion and a heat radiating portion to which a plurality of heat radiating fins are attached,
A lamp unit characterized in that light leakage from the lamp is shielded by the radiation fin.   The lamp unit according to claim 1, wherein the heat radiation fin is provided to be inclined at an angle that blocks an optical path from the light source.   The lamp unit according to claim 1, wherein the radiating fin is deformed into a shape that blocks an optical path from the light source.   The radiator is formed by connecting the heat absorbing part to a bottom part of the heat radiating part, the heat absorbing part is constituted by a first flat plate type heat pipe, and the heat radiating part has second flat ends at both ends of the heat radiating fins. The lamp unit according to claim 1, wherein the lamp unit is fixed to a bent side wall of the mold heat pipe.   2. The lamp unit according to claim 1, wherein the heat absorbing portion extends in the vicinity of the lamp and is curved along the shape of the lamp. An endothermic part constituted by a first flat plate heat pipe;
A second flat plate heat pipe is bent to form a side wall and a bottom part, and a heat radiating part having a plurality of heat radiating fins attached to the side wall,
A heat radiator, wherein the heat radiation fin blocks an optical path from a light source disposed in the vicinity.   The radiator according to claim 6, wherein the heat absorbing portion is connected to the bottom portion of the heat radiating portion, and the heat radiating fin is deformed or inclined with respect to the bottom portion.

Images