JP3829943B2 - Projection device - Google Patents

Description

  The present invention relates to a projection apparatus, and more particularly to a projection apparatus in which a fan for blowing air to a lamp unit as a light source is installed.

  In this type of projection apparatus such as a liquid crystal projector, the lamp unit generates a high heat as a heat source, and therefore the lamp unit is cooled by the air blowing action of the fan and the lamp unit or the housing that houses the lamp unit is used. Prevents overheating.

  In addition, the cooling of the light source and the optical system has been conventionally performed in various forms (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3). In the video display device, a light shielding plate is provided in front of a color filter or a rod integrator in an optical path of illumination light, and a heat radiating portion is extended to the light shielding plate to eliminate unnecessary internal components. It releases heat energy to the outside. Patent Document 2 describes that in a display device, the temperature inside the cover is suppressed by ventilating the air inside the cover that covers the color disk. Further, Patent Document 3 describes a cooling device for a projector. According to the description, a light shielding unit is arranged between an optical unit and a fan at a side of the optical unit.

JP 2002-318423 A JP 2002-280099 A JP 2003-21870 A

  By the way, in a fan for blowing used in a projection device, a casing of the fan motor often incorporates a sliding machine component such as a bearing and a control element such as an operation control IC. In such a fan, it is necessary to minimize the influence of heat generation during operation of the lamp unit, for example, because the fan motor may be affected by the heat generation of the lamp unit and performance stability may be impaired. In particular, it is necessary to satisfy the specifications so as to suppress as much as possible the influence of residual heat immediately after the lamp unit is stopped.

  Therefore, an attempt has been made to suppress the thermal effect on the fan motor as much as possible by providing a reflecting surface between the fan motor of the fan and the lamp unit so that the heat generated in the lamp unit is reflected by the reflecting surface. Specifically, the reflective surface is formed of an aluminum foil on the end surface of the fan motor casing, or the reflective surface is formed by sticking the aluminum foil to a resin frame disposed between the fan motor and the lamp unit. I tried to do that. According to this, the reflection surface reflects the heat of the lamp unit and the thermal effect applied to the fan motor is suppressed, and the specifications for the control elements such as sliding machine parts and operation control ICs of the fan motor are satisfied. It was found that the performance stability of the motor was maintained.

However, as described above, when aluminum foil is attached to the fan motor casing or resin frame as a means for forming the reflective surface, the aluminum foil is turned up or peeled off due to the heat of the lamp unit, so that the initial reflection A problem has been found that performance is impaired early.

  On the other hand, the technology described in each of the above-mentioned patent documents is not a technology intended to ensure the performance stability of the fan motor, and thus the above-described problem cannot be solved by the technology described therein. .

  The present invention has been made in view of the above problems and circumstances. When a fan is installed on the side of a lamp unit as a light source, the lamp unit extends to the fan motor by reflecting heat on the reflecting surface. An object of the present invention is to provide a projection apparatus that is based on suppressing the influence of heat generation and has taken such a measure that the initial suppressing action can be continued for a long time.

The projection device according to the present invention is a projection device in which a fan is installed on a side portion of a lamp unit as a light source. The fan includes the fan motor at a position facing the lamp unit. Between the lamp unit, a heat shield plate made of sheet metal that suppresses the influence of heat generation of the lamp unit on the fan motor is provided, and the heat shield plate has a plurality of locking claws around the heat shield plate. The locking claw is disposed between the fan motor and the lamp unit by locking the claw with a resin frame disposed between the fan motor and the lamp unit. is there. According to this, since the reflecting surface is formed by the surface of the heat shield plate made of sheet metal having excellent mechanical strength and thermal strength, the influence of the heat generation of the lamp unit on the fan motor is suppressed for a long time. Thus, the long-term performance stability of the fan motor is ensured.

In particular, the heat shield plate is a plurality of locking claws surrounding by Rukoto to engage with the plastic frame that are deployed between the fan motor and the lamp unit between the fan motor and the lamp unit by being deployed, the locking claw is positioned heat shield plate is mechanically locked on the resin frame, occur a situation that the initial performance of the heat shield plate by the influence of heat generated by the lamp unit is impaired I don't get it.

  In the present invention, the heat shield plate includes a heat shield plate main portion superimposed on a plate piece provided in the frame, the first, second and third separate locking claws, and the shield plate. Each of the plate pieces of the frame, each of which includes three different arm portions extending from the main portion of the heat plate in three different directions and having the first, second and third locking claws at the tip portion. It is possible to adopt a configuration in which the ventilation port provided around the door is divided by the above-mentioned arbitrary arm portion across the ventilation port. According to this, since a part of the ventilation opening of the frame is blocked by the arm, not only the situation where the influence of the heat generation of the lamp unit on the fan motor through the ventilation opening is suppressed, but also the size of the ventilation opening. Even if the finger is large enough to fit a person's hand, the arm divides the vent into small openings, so that the arm will not insert the finger into the vent for some reason. There is an advantage that the safety in handling can be improved.

  The projection device according to the present invention is a projection device in which a fan is installed on a side portion of a lamp unit as a light source. The fan includes the fan motor at a position facing the lamp unit. Between the lamp unit, a heat shield plate made of a sheet metal that suppresses the influence of heat generation of the lamp unit on the fan motor is provided, and the heat shield plate is disposed between the fan motor and the lamp unit. The main part of the heat shield laminated on the plate part of the resin frame disposed in the first, second and third locking claws, and three different directions from the main part of the heat shield And three different arm portions each having a first, second, and third locking claw at the distal end thereof, and the first locking claw is fitted to the frame from the side. And the second locking claw is The third locking claw is fitted and locked to the frame from the upper side, and the frame is formed in a U shape at each of the locking points. It is held by each of the locking claws, and the ventilation opening provided around the plate piece part of the frame is divided by the arm part across the ventilation part. It is made more concrete by adopting the configuration. The operation of the present invention will be described in detail with reference to the embodiments described later.

  As described above, according to the present invention, when the fan is installed on the side of the lamp unit as the light source, the influence of the heat generated by the lamp unit on the fan motor is suppressed by reflecting the heat on the reflecting surface. Such a function is stably exhibited over a long period of time, and the long-term performance stability of the fan motor is improved.

  FIG. 1 is a schematic exploded perspective view showing a lamp unit 1, a fan 3, and a resin frame 5 (hereinafter referred to as “frame”) employed in a projection apparatus according to an embodiment of the present invention. FIG. 3 is a schematic perspective view seen from the fan mounting surface side, FIG. 3 is a side view of the frame 5 seen from the fan mounting surface side, and FIG. 4 is an explanatory view showing the positional relationship of the lamp unit 1 and the fan 3 from above. 5A is an enlarged cross-sectional view of a portion along the line VA-VA of FIG. 3, and FIG. 5B is an enlarged cross-sectional view of a portion along the line VB-VB of FIG.

  1 to 3, the lamp unit 1 has a function as a light source of a projection device, and a reflector 12 surrounding the lamp is attached to a holding frame 13 made of a synthetic resin integrally molded body, so that the light beam of the lamp is received. Reflected by the inner surface of the reflector 12 and projected in the direction of arrow P. The fan 3 is formed by fixing a blade 33 to a rotating shaft of a fan motor 32 attached to the central portion of the outer frame 31. Inside the flat cylindrical casing of the fan motor 32, a sliding machine component such as a bearing, A control element such as an operation control IC is accommodated. The frame 5 is an integrally molded resin body formed in a gate shape that can slide and fit the holding frame 13 to which the reflector 12 is attached from the lateral direction, and forms the gate shape. Ventilation openings 53 and 54 are opened in the one-side frame portion 51 and the other-side frame portion 52, respectively.

  The lamp unit 1 is inserted into the insertion hole 15 of the mounting piece 15 of the lamp unit 1 in a state where the lamp unit 1 is fitted into the portal frame 5 and the positioning projection 14 on the lamp unit 1 side and the positioning hole 55 on the frame 5 side are fitted. The inserted mounting screws 16 are screwed into the screw holes 56 on the frame 5 side and tightened to be attached to the frame 5. On the other hand, the fan 3 is inserted into the outer frame 31 in a state where the positioning hole 34 provided in the outer frame 31 is fitted into the positioning boss 57 protruding from the frame portion 51 on one side of the frame 5. The mounting screw (not shown) inserted through the hole 35 is screwed into the screw hole 58 of the frame 5 and tightened to be attached to the frame 5. Thus, when the lamp unit 1 and the fan 3 are attached to the frame 5, the fan 3 is provided on the side of the lamp unit 1, and between the lamp unit 1 and the fan 3, the one-side frame 51 of the frame 5 is provided. Deployed. When the fan 3 is driven to blow air, an airflow that contacts the lamp unit 1, its reflector 12, and further the lamp is generated, and the temperature rise of the lamp unit 1 is suppressed.

  By the way, in the projection apparatus having such a configuration, when an image is projected on a screen (not shown), the lamp unit 1 is operating with heat generation, but the fan 3 is also driven. Therefore, the lamp unit 1 is cooled by the air flow generated by the air blowing action of the fan 3, and the temperature rise is suppressed.

  However, when the operation of the lamp unit 1 is stopped and the fan 3 is stopped accordingly, and no airflow is generated, the residual heat of the lamp unit 1 is trapped in the frame 5, and the fan motor 32 of the fan 3 is heated by the heat. The temperature rises. If the temperature of the fan motor 32 rises too much, the temperature of the sliding machine parts such as the bearing of the fan motor 32 and the control elements such as the operation control IC becomes spec over due to heat, and the performance is impaired. Or they will be damaged.

  Therefore, in this embodiment, the fan motor 32 is prevented from being overheated by taking the following measures.

  That is, as shown in FIG. 2, FIG. 3, or FIG. 4, the circular plate piece 61 having the same size as the end surface of the cylindrical casing of the fan motor 32 is formed on the one-side frame portion 51 of the frame 5. Therefore, the plate piece 61 is interposed between the fan 3 and the lamp unit 1 at a position facing the end face of the casing of the fan motor 3, and the plate piece 61 is shielded on the inner surface side of the plate piece 61. The hot plate 7 is held in an overlapping manner. By doing so, the surface of the heat shield plate 7 made of sheet metal acts as a reflecting surface to reflect the residual heat of the lamp unit 1, so that the influence of the residual heat of the lamp unit 1 on the fan motor 32 is reduced. Moreover, since the reflecting surface is formed by the surface of the heat shield plate 7 made of sheet metal having excellent mechanical strength and thermal strength, the influence of the residual heat of the lamp unit 1 on the fan motor 32 is suppressed over a long period of time. As a result, the long-term performance stability of the fan motor 32 is maintained.

  As shown in FIG. 1, the heat shield plate 7 includes a heat shield main portion 70 formed in a circular shape having substantially the same size as the plate piece portion 61 of the frame 5, and the circumferential direction of the heat shield plate 7. The first, second, and third three arm portions 72, 73, 74 that extend outward from the heat shielding plate main portion 70 from three positions spaced apart from each other, and the respective arm portions 72, 73, The first, second and third U-shaped locking claws 75, 76, 77 provided at the respective distal end portions of 74 are integrally provided. The first arm portion 72 extends from the heat shield plate main portion 70 to the horizontal side, the second arm portion 73 extends vertically downward from the heat shield plate main portion 70, and the third arm portion 74 is formed of the heat shield. It extends from the plate main portion 70 obliquely upward. Further, as shown in FIG. 3, the first locking claw 75 at the tip of the first arm portion 72 is fitted to the longitudinal rib 62 provided on the frame portion 51 on one side of the frame 5 from its side portion. The second locking claw 76 at the distal end of the second arm portion 73 is engaged with the lower transverse rib 63 provided in the frame portion 51 as shown in FIG. Further, the third locking claw 77 at the tip of the third arm portion 74 is fitted to the upper transverse rib 64 provided in the frame portion 51 as shown in FIG. The first, second, and third arm portions 72, 73, and 74 are positioned outside the frame portion 51 (on the fan mounting surface side). And the locking location with respect to each said rib 62,63,64 of the 1st-3rd three locking claws 75,76,77 is three places at intervals of substantially equal angle in the circumferential direction of the heat-shielding board main part 70. It is distributed to.

  When the heat shield plate 7 is attached to the frame 5 with this structure, the heat shield main portion 70 is sandwiched between the plate piece portion 61 of the frame 5 and the holding frame 13 of the lamp unit 1, and the first and second Since the third arm portions 72, 73, 74 are sandwiched between the one-side frame portion 51 of the frame 5 and the fan 3, the heat shield plate 7 is mounted on the frame 5 unless the lamp unit 1 or the fan 3 is removed. The situation of falling out of the situation will not occur. Therefore, a situation in which the initial performance of heat reflection by the heat shield plate 7 is not deteriorated due to dropping or turning up of the heat shield plate 7 does not occur.

  In this embodiment, as shown in FIG. 3, the lateral intermediate portion of the large vent 53 provided on the one-side frame portion 51 of the frame 5 and opened above the plate piece portion 61 is the third arm portion. 74 crosses diagonally. Therefore, even if the ventilation hole 53 is large enough for a finger of a person's hand to enter, the ventilation opening 53 is divided into small openings 53a and 53b by the third arm portion 74. Thus, the third arm 74 can prevent the finger of the hand from being inserted into the vent 53.

1 is a schematic exploded perspective view showing a lamp unit, a fan, and a resin frame employed in a projection apparatus according to an embodiment of the present invention. It is the schematic perspective view which looked at the flame | frame from the fan attachment surface side. It is the side view which looked at the flame | frame from the fan attachment surface side. It is explanatory drawing which showed the positional relationship of a lamp unit, a fan, a heat shield, etc. from the top. (A) is an expanded sectional view of the part which follows the VA-VA line of FIG. 3, (B) is an expanded sectional view of the part which follows the VB-VB line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lamp unit 3 Fan 5 Resin frame 7 Heat shield plate 32 Fan motor 53,54 Ventilation hole 61 Plate piece part 70 Heat shield plate main part 72 1st arm part 73 2nd arm part 74 3rd arm part 75 1st engagement Claw 76 Second locking claw 77 Third locking claw

Claims (3)

In a projection device in which a fan is installed on the side of a lamp unit as a light source,
The fan includes the fan motor at a position facing the lamp unit, and is made of a sheet metal that suppresses the influence of the heat generated by the lamp unit on the fan motor between the fan motor and the lamp unit. A heat shield is deployed,
The heat shield plate includes a heat shield main portion superimposed on a plate piece portion of a resin frame disposed between the fan motor and the lamp unit, and first, second and third separate heat shield plates. A locking claw, and three separate arm portions that extend in three different directions from the main part of the heat shield plate and have the first, second, and third locking claw at the tip,
The first locking claw is fitted and locked to the frame from the side, the second locking claw is fitted and locked to the frame from the outside, and the third locking claw is locked to the frame. The frame is held by the respective locking claws formed in a U-shape at each of the locking points, and the plate piece portion of the frame A projection apparatus characterized in that the ventilation opening provided around the door is divided by the above-mentioned arbitrary arm portion across the ventilation opening. In a projection device in which a fan is installed on the side of a lamp unit as a light source,
The fan includes the fan motor at a position facing the lamp unit, and is made of a sheet metal that suppresses the influence of the heat generated by the lamp unit on the fan motor between the fan motor and the lamp unit. A heat shield is deployed,
The heat shield plate has a plurality of locking claws around the heat shield plate and locks the locking claws with a resin frame disposed between the fan motor and the lamp unit. And a projection unit provided between the lamp unit and the lamp unit . The heat shield plate is superposed on a plate piece provided on the frame, the first, second and third separate locking claws, and the heat shield plate main part. Three different arm portions extending in three different directions from each other and having the first, second and third locking claws at the tip portion, and provided around the plate piece portion of the frame The projection apparatus according to claim 2 , wherein an arbitrary arm portion crosses the vent hole and the vent hole is divided.

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