JP2007052130A - Heat radiation mechanism for video projection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide heat radiation structure capable of easily achieving the stabilization of heat radiation performance for the heat of a lamp and safety when the lamp is burst in a video projection device equipped with the lamp being a light source for projecting a video. <P>SOLUTION: A holding means 50 holding the lamp 22 being a heat source and heat sinks 28 and 29 being a heat radiation means in a fixed state is mounted on an assembly constituted by attaching the heat sinks 28 and 29 to the lamp 22. The holding means 50 is equipped with a pressing means (for example, compression coil spring) 51 forcibly pressing the heat sinks 28 and 29 so as to tightly contact with the lamp 22, whereby the tight contact of the lamp 22 with the heat sinks 28 and 29 is improved and a stable heat radiation effect is obtained. If the lamp 22 is burst, the pressing means 51 effectively absorbs the shock, thereby securing the safety. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat dissipating mechanism for efficiently dissipating and cooling heat generated from a lamp as a light source in an image projecting device that projects and displays an image on a screen.

  In a projection apparatus that projects an image, a lamp as a light source is the largest heat source in the image projection apparatus. In order to cool the lamp, it is usual to provide a heat radiating means for the lamp inside the apparatus. As one of the heat dissipation means, there is a heat sink using aluminum or copper material, and by fixing this to the surface of the lamp with screws etc., heat is conducted from the lamp to the heat sink and dissipated, and the lamp body is cooled. The

Conventionally, as a heat dissipation structure in which a heat sink is fixed to a lamp in this manner, there is a structure disclosed in Patent Document 1 below, for example.
Japanese Patent No. 2720253

However, in the heat dissipation structure disclosed in Patent Document 1, since the heatsink is fixed to the lamp by fixing with screws or the like, the heat dissipation performance varies depending on assembly variations, causing individual differences. In addition, the lamp may burst due to overheating or life. In this case, the conventional structure has no means for absorbing the impact at the time of the lamp burst, so there is anxiety in terms of safety.
The present invention has been made in view of such problems, and an object of the present invention is to provide a heat dissipating structure that can easily realize stabilization of heat dissipating performance of lamp heat and ensuring safety at the time of lamp burst.

  That is, the present invention relates to a heat dissipation mechanism configured by mounting a heat sink as a heat dissipation means on a lamp in an image projection apparatus provided with a lamp as a light source for projecting an image. A holding means for holding the lamp in a fixed state is attached, and the holding means is provided with a pressing means (for example, a compression coil spring) that presses the heat sink so as to forcibly adhere to the lamp. is there.

  According to the present invention, it is possible to always contact the lamp as the heat source and the heat sink as the heat radiating means with a pressing force of a certain level or more, and the sufficient adhesion can be secured, so that stable heat radiating performance can be obtained, The heat of the lamp can be radiated and cooled more efficiently. Further, in the configuration of the present invention, when the lamp is ruptured, the impact of the rupture can be effectively absorbed by the pressing means being bent in the direction opposite to the pressing direction, so that safety is sufficiently ensured. effective.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing the external appearance of a video projector (video projector) to which the present invention is applied. The image projection apparatus 1 includes a lamp as a light source, an optical system that modulates light emitted from the lamp, and a cooling unit that cools the lamp and the optical system in the apparatus main body 2. The image light modulated in (4) is projected from the front projection lens 3 onto the front screen and displayed.

  The image projection apparatus 1 is hung from the ceiling 5 in a normal flat type installed in a state where it is placed horizontally on a predetermined installation surface 4 as shown in FIG. 4 and upside down as shown in FIG. Thus, it is possible to adopt two ceiling-mounted installation forms.

  In this image projection apparatus 1, the upper surface portion of the exterior of the apparatus main body 2 is composed of a separate top plate (top cover) 6. The top plate 6 is formed so as to cover substantially the entire upper surface of the apparatus main body 2, and is configured to open and close by sliding in the front-rear direction with respect to the apparatus main body 2.

  2 shows a state in which the top plate 6 is closed, and FIG. 3 shows a state in which the top plate 6 is slid forward and opened. As shown in FIG. 3, when the top plate 6 is slid forward and opened, a lamp unit housing portion 19 for housing a lamp unit 20 containing a lamp 22 as a light source is provided from the upper surface of the rear portion of the apparatus body 2. Exposed.

  In this configuration, the opening / closing means for opening and closing the top plate 6 will be described in detail. The opening / closing means includes a rolling mechanism 7 provided on the back side of the top plate 6, and a guide groove 11 provided on the apparatus main body 2 side corresponding to the rolling mechanism 7 and serving as a guiding means for guiding the rolling mechanism 7. And composed of

  The rolling mechanism 7 is provided at a total of four locations, two front left and right locations and two rear left and right locations on the back side of the top plate 2, and its configuration projects on the back side of the top plate 6 as shown in FIGS. 7 and 8. A roller 10 is rotatably supported on a leg portion 8 via a shaft 9.

  Guide grooves 11 for guiding the rolling mechanism 7 are formed in the front-rear direction on the left and right sides of the upper surface of the apparatus body 2, and the rollers 10 of the rolling mechanism 7 are placed on the guide grooves 11. By rolling and moving along the guide groove 11, the top plate 6 is slid in the front-rear direction with respect to the apparatus main body 2 to be opened and closed.

  In this configuration, as shown in FIG. 7, the guide groove 11 is formed with a recess 11a into which the roller 10 of the rolling mechanism 7 falls at the position where the top plate 6 is closed, and the roller 10 falls into this recess 11a. As a result, the top plate 6 comes into close contact with the apparatus body 2 and is completely closed. When the top plate 6 is opened from this state, the top plate 6 is pushed forward so that the roller 10 rises while rolling on the inclined surface 11b from the recess 11a, and then rolls horizontally along the guide groove 11. . As a result, the top plate 6 slides forward along the movement trajectory of the roller 10 and is opened as shown in FIG.

  Further, in this configuration, as shown in FIG. 8, an auxiliary rail 12 having a shape for wrapping the roller 10 on the guide groove 11 is attached to the apparatus main body 2 side along the entire length of the guide groove 11. 10 is held so as to surely roll and move along the guide groove 11 without dropping from the guide groove 11.

  In the above configuration, the rolling mechanism 7 is employed as the top plate opening / closing means. However, instead of the rolling mechanism 7, a sliding mechanism 13 as shown in FIG. 9 may be employed. That is, the sliding mechanism 13 is configured by attaching a slider 14 made of a resin material or the like having a good sliding property to a leg portion 8 projecting from the back side of the top plate 6, and the slider 14 is a guide as a guide means. By moving so as to slide along the groove 11, the opening / closing operation of the top plate 6 with respect to the apparatus main body 2 is performed.

  Further, in the image projection apparatus of the present example, a light lock mechanism is provided for locking the top panel 6 with a light holding force when the top panel 6 is opened and closed. As shown in FIG. 10, the light lock mechanism includes an engagement protrusion 15 provided on the back surface side of the top plate 6, and an engagement hook 16 provided on the apparatus main body 2 side corresponding to the engagement protrusion 15. Here, the engaging hook 16 is composed of a front hook 16a and a rear hook 16b provided facing each other as shown in FIGS. 2 and 3, and the top plate 6 is opened (FIG. 3). Then, when the engagement projection 15 is engaged with the front hook 16a, the top plate 6 is locked with a light holding force, and when the top plate 6 is closed (FIG. 2), the engagement projection 15 is formed on the rear hook 16b. By engaging, the top plate 6 is structured to be locked with light holding. In order to release the light lock, the top plate 6 is pushed and slid by a slightly strong force, and the engagement hooks 16a and 16b are bent by the force to remove the engagement protrusion 15 from the engagement hook. That's fine.

  Furthermore, in the image projection apparatus of this example, a lock mechanism is provided for completely locking the top plate 6 when the top plate 6 is closed. As shown in FIG. 11, the lock mechanism is composed of a lock hole 17 provided on the back side of the top plate 6 and a lock pin 18 protruding from the apparatus body 2 side corresponding to the lock hole 17. When the top plate 6 is completely closed, the lock plate 18 is inserted and engaged with the lock hole 17 as shown in FIG. To do so, the lock pin 18 is pulled out of the lock hole 17 as shown in FIG. 11B by pressing a lock release button (not shown) provided on the bottom of the apparatus body 2. The top plate 6 is unlocked by being retracted.

  Then, as shown in FIG. 3, the lamp unit 20 detachably accommodated in the lamp unit accommodating portion 19 of the apparatus main body 2 is opened by sliding the top plate 6 forward in the unlocked state. Is exposed. Here, the lamp unit 20 is attached to the apparatus main body 2 by a screw 27, and when replacing the lamp that has expired, the lamp unit 20 is removed by removing the screw 27 using a tool such as a screwdriver. Can be taken out from above (or below if it is suspended from the ceiling) and easily replaced with a new lamp unit.

  In this case, in the image projection apparatus of this example, since the top plate 6 is lightly locked with the top plate 6 open as described above, the top plate 6 is inadvertently closed during the replacement of the lamp unit 20. Therefore, the lamp unit 20 can be replaced with peace of mind. When the replacement of the lamp unit 20 is completed, the top plate 6 is slid rearward and closed, and the top plate 6 is locked by the lock mechanism described above in a state where the top plate 6 is completely closed.

  As described above, the image projection apparatus of the present example has a structure in which the lamp unit 20 is replaced by opening the top plate 6 constituting the upper surface portion of the apparatus body 2, and a lamp replacement window is provided on the exterior of the apparatus as in the past. Since the structure is not provided, the aesthetic appearance is not impaired, and there is no need for heavy labor such as replacing the lamp by inverting the apparatus. In particular, this image projection device has a structure in which the top plate 6 is slid and opened, so that the top plate 6 does not interfere with the lamp replacement work. In particular, the image projection device is suspended from the ceiling. Since there is no fear that the top plate 6 will hit the lamp replacement operator when the ceiling-suspended type is used, the lamp replacement operation can be performed smoothly.

  Further, in the image projection apparatus of this example, a holding mechanism is provided for correcting and holding the alignment defect between the top plate 6 and the apparatus main body 2 due to insufficient rigidity of the top plate 6. This holding mechanism is composed of a guide portion 61 made of two parallel plates provided on the apparatus main body 2 side, and a pin 62 projecting on the back side of the top plate 6 correspondingly. 2, when the top plate 6 is closed, the pin 62 is engaged between the two parallel plates of the guide portion 61, so that the top plate 6 is corrected for a problem of alignment with the apparatus main body 2. In this state, it is securely held in that state without rattling.

  Further, in the image projection apparatus of this example, a transparent portion 63 for displaying a manufacturer logo or the like is provided at a substantially central portion of the top plate 6. On the other hand, on the apparatus main body 2 side, an LED light emitting unit 64 is provided at a position corresponding to the transparent portion 63 in a state where the top plate 6 is closed, and when the top plate 6 is closed, the LED light emitting unit 64 is provided. When the light is emitted, a manufacturer logo or the like is clearly displayed from the transparent portion 63.

  Furthermore, the video projection apparatus of the present example is provided with electrical detection means for detecting the state when the top plate 6 is closed. As this electrical detection means, a limit switch 65 is preferably used. When the top plate 6 is closed as shown in FIG. 4, the operation projection 65 provided on the back side of the top plate 6 causes the limit switch 65 to be connected. By being pushed and operated, the closed state of the top plate 6 is detected. In this configuration, if the driving voltage is supplied to the lamp 22 only when the closed state of the top plate 6 is detected by the limit switch 65, the lamp is erroneously emitted with the top plate 6 open. It is effective in terms of safety because there is no risk of electric shock during lamp replacement work.

  Next, the lamp 22 used in the image projection apparatus of this example will be described in detail. This lamp 22 is a xenon lamp configured by enclosing a high-pressure (20 to 200 atm) xenon gas inside, and emits light by applying a voltage to the high-pressure gas for discharge. Compared with filament lamps, it has lower power consumption and longer life.

  The external structure of the lamp 22 used in this example is shown in FIGS. 12A and 12B are a front view and a side view of the lamp, and FIG. 13 is a perspective view of the lamp as viewed from the rear. The exterior of the lamp 22 is configured by joining a front case 23A and a rear case 23B, and high-pressure gas is sealed therein. Here, the front case 23A and the rear case 23B are both made of metal and insulated from each other, and each is configured as an electrode. That is, in the lamp 22 of this example, the entire front case 23A is a negative electrode, and the entire rear case 23B is a positive electrode. By applying a drive voltage between these electrodes, Electric discharge is performed to emit light, and the light is emitted from the exit port 24 made of sapphire glass provided on the front surface of the front case 23A.

  The lamp 22 has a sealing part 25 for venting gas at a predetermined position on the exterior (in this example, the rear end surface of the rear case 23B). The sealing portion 25 is formed by sealing the tip of the exhaust pipe protruding from the exterior of the lamp 22. As will be described later, when replacing the lamp, a hole is formed in the sealing portion 25 from the inside of the lamp. Is degassed.

  Since the lamp 22 becomes high temperature as light is emitted, heat sinks 28 and 29 are mounted on the lamp 22 as heat dissipating means as shown in FIG. The heat sinks 28 and 29 are aluminum blocks and are mounted so as to cover the front case 23A and the rear case 23B of the exterior of the lamp 22, respectively.

  Cooling air is blown to the lamp 22 and the heat sinks 28 and 29 from a cooling fan as a cooling means built in the apparatus, thereby more efficiently dissipating the heat of the lamp 22. To prevent the temperature inside the device from rising. Here, in the actual configuration, in order to further increase the heat dissipation efficiency, the same aluminum cooling fins are attached to both side surfaces of the heat sinks 28 and 29, but the illustration is omitted here.

  In the image projection apparatus of this example, the lamp unit 20 and the heat sinks 28 and 29 are assembled into the unit case 21 shown in FIG. The lamp unit 20 is attached to the apparatus main body 2 by a screw 27, and the lamp unit 20 and the lamp unit 20 can be easily replaced by removing the screw 27.

  In this lamp replacement, in consideration of environmental problems, it is indispensable to remove the high-pressure gas enclosed in the lamp 22 after removing it. Therefore, in the video projection apparatus of this example, a gas venting device for easily and reliably venting the lamp 22 is configured in the lamp unit 20. The degassing device includes a degassing sealing portion 25 provided in the lamp 22, and a degassing screw 30 as a degassing means incorporated in the lamp unit 20 corresponding to the sealing portion 25. Configured.

  As shown in FIG. 14, the degassing screw 30 is formed of a screw member having a general metric coarse screw shape, which is assembled through a screw hole 31 provided in the heat sink 29, and a tip portion 30a thereof is formed. This corresponds to the sealing portion 25 of the lamp 22. As shown in FIG. 15, the head 30b of the degassing screw 30 is exposed to the outside of the lamp unit 20 through a hole 35 provided in the upper surface of the unit case 21, and a tool is inserted into the degassing screw. By rotating 30, the distal end portion 30 a of the degassing screw 30 comes into contact with the sealing portion 25 of the lamp 22 to open a hole, thereby discharging the gas in the lamp 22 from the sealing portion 25. ing. With this structure, the operator can easily degas the lamp 22 without directly touching the main body and the sealing portion 25 of the lamp 22 and without using a cutting tool such as a nipper.

  In the image projection apparatus of this example, in a normal flat installation state as shown in FIG. 4, the head 30b of the degassing screw 30 is located on the upper surface side of the apparatus, and the ceiling-suspended type as shown in FIG. In this installation state, the head 30b of the gas vent screw 30 is positioned on the lower surface side of the apparatus. That is, in this image projection apparatus, the head 30b of the gas vent screw 30 is always positioned on the opposite side of the installation surface. Therefore, the user can easily operate the degassing screw 30 in any installation state.

  FIG. 16 shows an example of the shape of the gas vent screw 30. By properly using these gas venting screws 30, it is possible to cope with the difference in the position of the sealing portion 25 in the lamp 22 and to change the tool to be used. FIG. 16A shows an example of a degassing screw whose tip 30a has a cylindrical blade shape. In this degassing screw 30, the sealing portion 25 of the lap 22 is gradually moved by the rotation of the cylindrical blade of the tip 30a. Drilling is performed while cutting. In the case of this degassing screw 30, the contact area with the sealing portion 25 can be changed by changing the blade diameter of the tip portion 30 a, and the torque required for drilling can be adjusted. FIG. 16B shows an example of a degassing screw whose tip portion 30 a has a sharp blade shape. In this degassing screw 30, the sharp blade-shaped tip portion 30 a is pierced through the sealing portion 25, and a hole is made. Is called. Since the degassing screw 30 in this example has the smallest contact area with the sealing portion 25, the torque required for drilling is also the smallest. FIG. 16C shows an example of a degassing screw having a tip 30a in a drill shape. In this degassing screw 30, drilling is performed while the drill-shaped tip 30a scrapes off the sealing portion 25 efficiently. .

  FIG. 17 shows an example of the shape of the head 30 b (tool insertion portion) of the gas vent screw 30. 17A is an example of a head shape with a hexagonal hole 36, FIG. 17B is an example of a head shape with a cross hole 37, and FIG. 17C is an example of a head shape with a slot 38, respectively. A plus-type screwdriver, a hexagon wrench, and a minus-type screwdriver are inserted as tools to rotate the degassing screw 30. The shape of the head 30b of the degassing screw 30 can be appropriately changed according to the tool to be used.

  Here, in particular, the shape of the head portion 30b of the degassing screw 30 is desirably the same shape as the head portion of the screw 27 used for mounting the lamp unit 20. By doing so, the two operations of degassing the lamp 22 and removing the lamp unit 20 can be performed in common with one tool, which is efficient.

  FIG. 18 shows an example of the position of the sealing portion 25 in the lamp 22. In the gas venting apparatus of this example, the assembly position of the gas venting screw 30 can be changed according to the difference in the formation position of the sealing portion 25 of the lamp 22. FIG. 18A shows an example in which a sealing portion 25 is provided so as to protrude horizontally from the rear end surface of the rear case 23B of the lamp 22. In this case, as shown in FIG. 14, screw holes 31 provided in the heat sink 29 are provided. The degassing screw 30 is assembled through, and the tip 30a of the degassing screw 30 is brought into contact with the sealing portion 25 perpendicularly to make a hole. In the configuration of this example, since there is no interference between the heat sinks 28 and 29 and the sealing portion 25, the diameter of the sealing portion 25 can be increased to widen the range in which the gas vent screw 30 contacts, and more reliable gas It can be removed. Further, if the center of the gas releasing screw 30 is shifted from the center of the sealing portion 25 and brought into contact with each other, the contact area of the blade of the distal end portion 30a is reduced, so that the gas can be released with less torque.

  FIG. 18B shows an example in which a sealing portion 25 is provided so as to protrude horizontally from the front surface of the front case 23A of the lamp 22 to the side. In this case, a screw provided on the heat sink 28 shown in FIG. The degassing screw 30 is assembled through the hole 32, and the distal end portion 30a of the degassing screw 30 is brought into contact with the sealing portion 25 in a vertical direction so as to make a hole. In this example, the sealing part 25 is supported by the heat sink 28 from the side opposite to the contact surface with the gas venting screw 30, so that more reliable gas venting is possible.

  FIG. 18C shows an example in which the sealing portion 25 is provided to protrude obliquely upward from the front surface of the front case 23A of the lamp 22. In this case, the screw hole 33 provided in the heat sink 28 shown in FIG. The degassing screw 30 is assembled through, and the distal end portion 30a of the degassing screw 30 comes into contact with the sealing portion 25 at an angle, so that a hole is formed. In the configuration of this example, in particular, when a gas vent screw 30 whose tip portion 30a has a cylindrical blade shape as shown in FIG. 16A is used, the tip portion 30a of the gas vent screw 30 is the sealing portion 25. Since the area in contact with the gas becomes small, the gas can be vented with a smaller torque.

  The degassing operation of the lamp 22 as described above is performed before the lamp unit 20 is removed from the apparatus main body 2. That is, when the lamp unit 20 is replaced in the image projection apparatus of this example, the degassing screw 30 is first operated to degas the lamp 22 as described above, and then the lamp unit 20 is removed from the apparatus body 2. Remove and discard. By doing so, it is possible to reliably prevent the lamp unit 20 from being discarded while the high-pressure gas is sealed in the lamp 22.

  As described above, the image projection apparatus of the present example can be disposed of after the gas of the lamp is surely removed when replacing the lamp, so that the product value can be greatly enhanced as an image projection apparatus in consideration of environmental problems. It is.

  FIG. 19 shows a modification of the degassing screw 30 in which the tip 30a has a cylindrical blade shape as shown in FIG. That is, in this shape of the gas vent screw 30, when a hole is made in the sealing portion 25 by the tip portion 30 a, the fragmented piece is clogged and sealed on the inner peripheral side of the tip portion 30 a, and the sealing portion There is a possibility that a problem that the gas does not escape from 25 may occur. Therefore, as shown in FIG. 19, if the hole 40a is provided in the cylindrical portion of the distal end portion 30a of the gas releasing screw 30 and the crushed pieces can be excluded through the hole 40a, the above problem can be easily solved. Can do. Further, the degassing screw 30 is provided with a groove 40b in the blade of the distal end portion 30a, and a crushed piece generated when a hole is made in the sealing portion 25 is released to the groove 40b, and the sealing portion 25 and the degassing screw are released. By limiting the contact surface with 30 to only a circular blade portion at all times, gas can be vented with a small torque.

  FIG. 20 shows an example in which a positioning means for accurately matching the tip portion 30a of the degassing screw 30 with the sealing portion 25 is provided. That is, for example, when using a gas vent screw 30 having a sharp tip 30a as shown in FIG. 16B, the sharp tip 30a must correspond to the center of the sealing portion 25 accurately. Since the holes cannot be formed smoothly, as shown in FIG. 20, an adjusting member 41 having a shape straddling the sealing portion 25 is installed as an alignment means, and a guide hole 41a provided in the central portion of the adjusting member 41 is provided. The tip 30a of the degassing screw 30 is in contact with the sealing portion 25 through the through hole. As a result, even when the sharpened tip 30 a of the gas vent screw 30 is slightly displaced from the center of the sealing portion 25, the tip portion 30 a of the gas vent screw 30 is guided to the guide hole 41 a of the adjustment member 41. As a result, a state corresponding to the center of the sealing portion 25 is obtained, so that the sealing portion 25 can be reliably vented and vented.

  Further, FIG. 21 shows an example in which holding means for holding the head 30a of the gas vent screw 30 and preventing malfunction of the gas vent screw 30 is provided. That is, in this configuration, a holding cap 42 is fitted as a holding means in the hole 35 of the lamp unit 20 where the head 30b of the gas releasing screw 30 is exposed, and the head 30b of the gas releasing screw 30 is held by the holding cap 42. Is held to prevent inadvertent rotation of the gas vent screw 30. Thereby, the gas venting of the lamp due to the malfunction of the gas venting screw 30 can be reliably prevented.

Subsequently, a heat dissipation structure for more efficiently dissipating the heat of the lamp 22 will be described.
As shown in FIG. 22, heat sinks 28 and 29 are mounted on the lamp 22 as a light source as a heat radiating means. The heat sinks 28 and 29 are block bodies made of a conductive metal such as aluminum or copper, and are mounted so as to cover the front case 23A and the rear case 23B of the exterior of the lamp 22, respectively.

  As shown in FIG. 23, the heat sinks 28 and 29 have a structure which is divided into left and right by a central groove 44 with the connection portion at the top left, and a shape corresponding to the exterior of the lamp inside the left and right divided portions. With the lamp 22 fitted in the recess 45, a clamp spring 46 is attached to the lower ends of the left and right divided parts so that the lamp 22 is fastened and fixed at the left and right divided parts. It is.

  In this configuration, the heat sinks 28 and 29 also function as electrode terminals for supplying power to the lamp 22. That is, as described above, the front case 23A and the rear case 23B of the lamp 22 are configured as a negative electrode and a positive electrode, respectively, so that the lamp 22 covers the front case 23A and the rear case 23B. By using the aluminum heat sinks 28 and 29 mounted in the form as electrode terminals, the drive voltage can be reliably supplied to the lamp 22 from the power supply unit via the heat sinks 28 and 29 with a simple configuration.

  In the configuration in which the heat sinks 28 and 29 are simply mounted on the lamp 22 as described above, the heat sinks 28 and 29 can move in the front-rear direction (in the direction of the outgoing optical axis of the lamp) with respect to the lamp 22. This is a state where the position is held only by the friction holding force by the clamp spring 46. In this state, sufficient adhesion between the lamp 22 and the heat sinks 28 and 29 cannot be ensured, so that the heat dissipation performance tends to be unstable.

  Therefore, in this heat dissipation mechanism, as shown in FIGS. 22 to 24, a tensioner 50 is attached to the assembly of the lamp 22 and the heat sinks 28 and 29 as a holding means for holding the posture in a fixed state. The tensioner 50 integrally includes a central plate portion 50a and bent plate portions 50b and 50c that are bent vertically from both ends of the central plate portion 50a, and the bent plate portions 50b at both ends thereof. , 50c is mounted so as to straddle the heat sinks 28 and 29 before and after the lamp 22 is mounted. Further, the tensioner 50 is provided with a compression coil spring 51 as a pressing means so as to be incorporated into a predetermined gap formed between the bent plate portions 50b, 50c at both ends thereof and the heat sinks 28, 29. In this example, the compression coil spring 51 is disposed between the rear bent plate portion 50 c of the tensioner 50 and the rear heat sink 29.

  In this configuration, since the heat sinks 28 and 29 are electrode terminals for supplying power to the lamp 22 as described above, the tensioner 50 mounted across the heat sinks 28 and 29 is made of an electrically insulating material. It is made of a certain resin (plastic). As a resin material used for the tensioner 50, a PPS resin excellent in heat resistance is suitable.

  With the tensioner 50 attached to the heat sinks 28 and 29, the compression coil spring 51 is compressed between the bent plate portion 50c of the tensioner 50 and the heat sink 29 to about one half of the original length. A certain spring force is generated in proportion to the amount of bending. In the configuration of this example, this spring force acts in a direction in which the front and rear heat sinks 28 and 29 are pressed against the heat conducting surfaces 22 a and 22 b of the lamp 22 to be in close contact with each other. As described above, in the configuration of this example, the action of the tensioner 50 and the compression coil spring 51 allows a constant pressing force (spring pressure) to be constantly applied to the lamp 22 and the heat sinks 28 and 29 within the range of product dimensional tolerances. This spring pressure can cause the heat sinks 28 and 29 to come into close contact with the lamp 22 with appropriate and sufficient pressure. Therefore, according to this configuration, sufficient adhesion between the lamp 22 as the heat source and the heat sinks 28 and 29 as the heat dissipating means can be ensured, so that a stable heat dissipating performance can be obtained and the heat of the lamp 22 can be dissipated more efficiently. And can be cooled.

  Moreover, according to this structure, the impact when the lamp | ramp 22 bursts can also be absorbed effectively. That is, the lamp 22 may burst due to overheating or life, in which case the front case 23A and the rear case 23B of the lamp 22 are explosively separated by the internal gas pressure, and a strong impact (burst energy) is generated. However, in the configuration of this example, when the lamp is ruptured, the compression coil spring 51 is bent so as to be compressed in the direction opposite to the pressing direction, so that the impact can be effectively absorbed. Even if 22 ruptures, the surroundings are not affected, and safety is sufficiently ensured.

  In the configuration of this example, as shown in FIG. 23, two compression coil springs 51 are arranged side by side as pressing means, but if a sufficient spring force is secured even with one compression coil spring, Only one compression coil spring 51 may be arranged in the center. Further, the pressing means is not limited to this compression coil spring, but other plate springs, air springs, elastic rubber bodies, and the like can also be suitably used.

  FIG. 25 is an example in which the tensioner 50 is provided with a flow guide means for guiding the flow of the surrounding cooling air to the lamp 22 as a heat source. That is, as described above, the cooling air is blown from the cooling fan built in the apparatus to the lamp 22 and the heat sinks 28 and 29. Here, in this example, the cooling air W is used. As the guide means, the guide vanes 52a and 52b are provided so as to protrude from both side surfaces of the central plate portion 50a of the tensioner 50, and the cooling air W is exposed between the heat sinks 28 and 29 by the guide vanes 52a and 52b. In this configuration, the lamp 22 is led. Thereby, the lamp 22 can be cooled more efficiently.

  FIG. 26 shows an example in which the degree of adhesion between the lamp 22 and the heat sinks 28 and 29 can be variably adjusted according to the temperature of the lamp 22. In this configuration, the tensioner 50 is provided in the tensioner 50 as a pressing force changing means for changing the pressing force of the compression coil spring 51. That is, the movable plate 54 is moved by driving the motor 53, so that the compression coil spring 51 is moved. The structure is such that the amount of deflection is variable. Here, a temperature sensor 55 for measuring the temperature of the lamp 22 is provided, and an arithmetic unit (processor) 56 controls the motor driver 57 to change the drive of the motor 53 based on the output of the temperature sensor 55. Yes.

  According to this configuration, the motor 53 can be driven and controlled according to the temperature change of the lamp 22 to automatically vary the pressure of the compression coil spring 51. For example, when the temperature of the lamp 22 rises, the compression is performed. By increasing the pressure of the coil spring 51, the lamp 22 and the heat sinks 28 and 29 can be brought into close contact with each other with a stronger force, so that more efficient heat dissipation can be achieved and further improvement of the cooling effect can be realized.

  In the above-described embodiment, the tensioner 50 is attached only to the upper side of the heat sinks 28 and 29. However, as shown in FIG. 27, a vertical target structure in which the tensioner 50 is also attached to the lower side may be used. By adopting such a structure, spring pressure can be applied in a balanced manner to the lamp 22 and the heat sinks 28 and 29, so that the adhesion between the lamp 22 and the heat sinks 28 and 29 is improved, and more stable heat dissipation performance is obtained. In addition, the impact absorbing effect at the time of lamp explosion is further ensured.

  As mentioned above, although the Example of this invention was described, it cannot be overemphasized that this invention can take other various embodiment, without being restricted to the structure of this Example.

It is a perspective view which shows the external appearance of a video projector. It is a top view of a video projector. It is a top view in the state where the top plate of the image projection device was opened. It is a side view of a video projector. It is a side view of the state in which the top plate of the video projector is open. It is a side view at the time of installing a video projector in a ceiling state. It is a side view which shows the example of the opening / closing means which opens and closes a top plate. It is a front view which shows the example of the opening / closing means which opens and closes a top plate. It is a front view which shows the other example of the opening / closing means which opens and closes a top plate. It is a configuration diagram showing an example of a light lock mechanism that locks the top plate with a light holding force. It is a block diagram which shows the example of the locking mechanism which locks a top plate completely. It is a figure which shows the external appearance structure of the lamp | ramp which is a light source. It is the perspective view seen from the back which shows the external appearance structure of the lamp | ramp which is a light source. It is a perspective view which shows the assembly of a lamp | ramp and a heat sink. It is a perspective view of the lamp unit in which a lamp and a heat sink are incorporated. It is a side view which shows the example of a shape of a degassing screw. It is a top view which shows the example of a shape of the head of a degassing screw. It is a figure which shows the example of the position of the sealing part for degassing in a lamp | ramp. It is sectional drawing which shows the modification of a degassing screw. It is a figure which shows the example which provided the adjustment member for degassing screws. It is a figure which shows the example which provided the holding cap for gas venting screws. It is a side view which shows the heat dissipation structure of the lamp | ramp equipped with the tensioner. It is a rear view which shows the thermal radiation structure of the lamp | ramp equipped with the tensioner. It is a top view which shows the thermal radiation structure of the lamp | ramp equipped with the tensioner. It is a top view which shows the example which provided the flow guide means in the tensioner. It is a block diagram of the thermal radiation structure which adjusts the adhesiveness of a lamp | ramp and a heat sink automatically. It is a block diagram of the thermal radiation structure which attached the tensioner up and down.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Video projector, 20 ... Lamp unit, 22 ... Lamp, 28, 29 ... Heat sink, 50 ... Tensioner (holding means), 51 ... Compression coil spring (pressing means), 52a, 52b ... ), 53... Motor (pressing force changing means), 55... Temperature sensor (temperature measuring means), 56.

Claims (7)

  In a video projection apparatus having a lamp as a light source for projecting an image, a heat dissipation mechanism configured by mounting a heat sink as a heat dissipation means on the lamp, and fixing both to the lamp and heat sink assembly A heat radiating mechanism in an image projection apparatus, wherein a holding means for holding the heat sink is attached, and the holding means is provided with a pressing means for pressing the heat sink so as to forcibly contact the lamp.   The heat radiation mechanism in the image projection apparatus according to claim 1, wherein the pressing means is a compression coil spring.   2. The heat dissipation mechanism in an image projection apparatus according to claim 1, wherein the pressing means absorbs an impact when the lamp is ruptured by bending in a direction opposite to the pressing direction.   2. The heat dissipation mechanism for an image projection apparatus according to claim 1, wherein the heat sink is made of a conductive metal and is divided into a positive electrode side and a negative electrode side of an electrode for supplying a voltage to the lamp.   5. The video projection device according to claim 4, wherein the holding unit is formed of an electrically insulating material in a configuration in which the holding unit is attached across the positive-side heat sink and the negative-side heat sink. Heat dissipation mechanism.   The heat dissipation mechanism in the image projection apparatus according to claim 1, wherein the holding unit includes a flow guide unit that guides a flow of ambient cooling air to the lamp. A temperature measuring means for measuring the temperature of the lamp; a pressing force changing means for increasing or decreasing the pressing force of the pressing means; and the pressing means by controlling the driving of the pressing force changing means in accordance with an output from the temperature measuring means. The heat radiation mechanism in the image projection apparatus according to claim 1, further comprising: a calculation unit that increases or decreases the pressing force of the image projection device.

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