JP2007304139A - Image display projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve reduction in cost by eliminating a cooling fan and a connector of expensive heat-resistant specification in an image display projector. <P>SOLUTION: By attaching a conical hot air diffusing plate 13 to a first cable 2c, hot air discharged from a gap between a cable insertion hole 11c and the first cable 2c is diffused, so that the hot air is prevented from directly blowing against a first connector 2d and a second connector 20a. By inserting the first cable 2c through the cable insertion hole 13a of the hot air diffusing plate 13 near the cable insertion hole 11c and engaging an engaging pawl 13b with an engaging pawl 13c, the conical hot air diffusing plate 13 is easily formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image display projector that projects and displays an image on a screen.

  2. Description of the Related Art Conventionally, in a projector used for projecting an image such as a personal computer on a screen, a cooling fan has been used to prevent overheating of a lamp unit due to light emission of a bulb. For example, Patent Document 1 discloses an image display projector that cools a lamp unit by sending air into a lamp case with a cooling fan. Patent Document 2 and Patent Document 3 disclose an image display projector that cools a lamp unit by discharging hot air in a lamp case with a cooling fan.

However, in the image display projectors shown in Patent Document 2 and Patent Document 3,
Since the hot air heated by the lamp unit passes through the inside of the cooling fan, it is necessary to make the bearing of the cooling fan heat-resistant, resulting in an increase in cost. On the other hand, the lamp case needs to be provided with a cable insertion hole for inserting a cable for supplying power to the lamp unit. In the image display projector disclosed in Patent Document 1, the air pressure in the lamp case is Since it is higher than the outside of the case, hot hot air flows out from the cable insertion hole. For this reason, it is necessary to use a heat-resistant specification connector when it is necessary to provide a cable connection component such as a connector in the vicinity of the cable insertion hole due to a demand for downsizing the image display projector, etc. Invite you.
JP 2004-14204 A JP 2002-258407 A JP 2002-27361 A

  SUMMARY An advantage of some aspects of the invention is that it provides an image display projector device that eliminates the need for an expensive heat-resistant cooling fan and connector and can reduce costs. .

  In order to achieve the above object, a first aspect of the present invention provides a lamp unit having a bulb that emits light for image projection, a lamp case that houses the lamp unit, a drive circuit that supplies power to the lamp unit, and a bulb. An image forming unit having a function of projecting the formed image on an external screen by reflecting light emitted from the digital micromirror device, a signal input unit to which image data is input from the outside, A control unit having a function of controlling the image forming unit to form an image based on the image data input to the signal input unit; a first cable extended from the lamp unit to supply power to the lamp unit; A first connector provided at the tip of the first cable, a second cable extending from the drive circuit, and a tip of the second cable A second connector connected to the first connector, and a blower fan for sending air into the lamp case to cool the lamp unit, the lamp case receiving the air sent by the blower fan An air intake port for taking in the lamp case, a hot air discharge port for discharging hot air heated by the lamp unit, and a cable insertion for inserting the front end side of the first cable into the outside of the lamp case In the image display projector having a hole, the first connector and the second connector are connected in the vicinity of the cable insertion hole, and the first cable receives hot air discharged from a gap between the cable insertion hole and the first cable. A conical hot-air diffuser plate to be diffused is mounted, and the hot-air diffuser plate is a fan-shaped plate-shaped portion made of a heat-resistant material having insulating properties. The hot air diffuser plate diffuses the hot air discharged from the gap between the cable insertion hole and the first cable in a radial manner by engaging the two radial portions of the first connector and the first connector. (2) Heat is not directly applied to the two connectors, and temperature rises of the first connector and the second connector are suppressed.

  According to a second aspect of the present invention, a lamp unit that emits light for image projection, a lamp case that accommodates the lamp unit, a drive circuit that supplies power to the lamp unit, and light emitted from the lamp unit are appropriately reflected. An image forming unit for forming and projecting an image, and a cable extended from the lamp unit for supplying power to the lamp unit, and the lamp case has a front end side of the cable outside the lamp case. In an image display projector having a cable insertion hole for insertion, a hot air diffusion plate for diffusing hot air discharged from a gap between the cable insertion hole and the cable is attached to the cable.

  According to a third aspect of the present invention, in the image display projector according to the second aspect, the hot air diffusion plate is formed in a conical shape from a fan-shaped plate-like member.

  According to the invention of claim 1, since the conical hot air diffusion plate mounted on the first cable diffuses the hot air discharged from the gap between the cable insertion hole and the first cable in a radial manner, the first connector and The hot air is not directly applied to the second connector. Thereby, the temperature rise of a 1st connector and a 2nd connector is suppressed, and it becomes unnecessary to use an expensive heat-resistant specification connector as a 1st connector and a 2nd connector, and can aim at cost reduction. Further, since the conical hot air diffusion plate is formed by engaging the two radial portions of the fan-shaped plate member, not only can the hot air diffusion plate be produced with an inexpensive and simple configuration, but also the first cable Easy to install. Further, since the first connector and the second connector are connected in the vicinity of the cable insertion hole, the apparatus can be reduced in size. Further, since the hot air diffusion plate is made of a heat-resistant material having insulating properties, there is no possibility of a short circuit or the like.

  According to the invention of claim 2, the hot air diffusion plate mounted on the cable diffuses the hot air discharged from the cable insertion hole, so that the hot air does not directly hit the cable tip. As a result, the temperature rise at the end of the cable is suppressed, and there is no need to use an expensive heat-resistant specification part such as a connector provided at the end of the cable, thereby reducing costs.

  According to the invention of claim 3, since the conical hot-air diffusion plate is formed from the fan-shaped plate-like member, not only can the hot-air diffusion plate be produced with an inexpensive and simple configuration, but it can be easily attached to the cable.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an image display projector 1 according to this embodiment. The image display projector 1 includes, for example, a lamp unit 2 having a metal halide lamp and a reflector, a drive circuit 3 that supplies power to the lamp unit 2, and an image forming unit that forms an image using light emitted from the lamp unit 2. 4, a signal input unit 5 to which image data is input from the outside, an operation input unit 6 provided so as to be operable from the outside, and a control unit configured by a microcomputer, a memory, and the like that control each unit of the image display projector 1 7, a power supply unit 8 connected to an external commercial power supply, a blower unit 9 that allows outside air to flow into the casing of the projector 1 and exhausts the air inside the casing to the outside. The projector 1 is used by being connected to, for example, an external personal computer or the like, and forms an image based on image data input from the personal computer or the like via the signal input unit 5, and is installed on an external screen (see FIG. (Not shown).

  The image forming unit 4 is controlled by the control unit 7 based on the image data input to the signal input unit 5, and uses, for example, a digital micromirror device (hereinafter referred to as DMD) to display an image corresponding to the image data. Form. The image forming unit 4 includes a DMD, a color wheel that sequentially transmits red, green, and blue light out of the light emitted from the lamp unit 2 to form a color image, and a color wheel for rotating the color wheel. It has a motor and a drive driver for driving them under the control of the control unit 7. The color wheel sequentially transmits red, green, and blue light among the light emitted from the lamp unit 2. The DMD forms an image by appropriately reflecting red, green, and blue light sequentially transmitted by the color wheel based on image data. An image formed by the DMD is projected toward an external screen or the like via a lens 4a configured to be able to perform zooming, focusing, and the like.

  The operation input unit 6 includes, for example, an operation button disposed on the housing of the image display projector 1 so as to be operable by a user from the outside, a switch that is switched by the operation of the operation button, and the like. When the operation input unit 6 is operated from the outside, a signal corresponding thereto is input to the control unit 7, and the control unit 7 outputs a control signal corresponding to the signal to each unit, thereby realizing various operations. . That is, the user can operate the operation of the image display projector 1 by operating the operation input unit 6. The operation input unit 6 may be configured by, for example, a light receiving unit provided in a housing and a remote controller that can be operated by a user. In this case, the user can remotely operate the image display projector 1 by infrared communication between the light receiving unit and the remote controller.

  The air blower 9 includes a cooling fan and a motor driver that drives a motor incorporated in the cooling fan. In addition to the cooling fan that is installed to allow air to flow in and out of the housing of the image display projector 1, the lamp unit 2 is locally disposed to prevent overheating of the lamp unit 2 and its surroundings. A blower fan 12 (see FIG. 2) for cooling is provided. The drive voltage of each cooling fan is controlled by the control unit 7 so that the temperature in the housing of the image display projector 1 that is projecting the image and the temperature of the lamp unit 2 are maintained at appropriate temperatures.

  FIG. 2 shows the configuration of the lamp unit 2 and its periphery. The lamp unit 2 extends from a metal halide lamp 2a serving as a light source for projecting an image, a reflector 2b for reflecting light emitted from the metal halide lamp 2a, and a lamp socket for supplying power to the metal halide lamp 2a. It is comprised by the 1st cable 2c etc. The lamp unit 2 is accommodated in the lamp case 11. A blower fan 12 for taking in air in front of the lamp case 11 and sending it to the inside of the lamp case 11 is provided in front of the side surface of the lamp case 11.

  The lamp case 11 is formed with an air intake port 11 a for taking in the air sent out by the blower fan 12 into the lamp case 11 at the joint with the blower fan 12. Further, a hot air discharge port 11b for discharging hot air heated by the lamp unit 2 is provided on the back surface of the lamp case 11, and a front end side of the first cable 2c is inserted outside the lamp case 11 on the side surface. The cable insertion hole 11c is formed. A first connector 2d is provided at the tip of the first cable 2c. The 1st connector 2d is connected with the 2nd connector 20a provided in the front-end | tip of the 2nd cable 20 extended from the drive circuit 3 in the vicinity of the cable penetration hole 11c.

  The arrows in FIG. 2 indicate the air flow by the blower fan 12. Since air is sent into the lamp case 11 by the blower fan 12 and air is heated by the lamp unit 2, the air pressure inside the lamp case 11 is higher than the outside. Therefore, the high-temperature hot air heated by the lamp unit 2 is discharged not only from the hot air discharge port 11b but also from the gap between the cable insertion hole 11c and the first cable 2c. Therefore, in this embodiment, by attaching the conical hot air diffusion plate 13 to the first cable 2c, the hot air discharged from the gap between the cable insertion hole 11c and the first cable 2c is diffused radially, The hot air is not directly applied to the first connector 2d and the second connector 20a.

  FIG. 3 shows a developed view of the hot air diffusion plate 13. The hot air diffusion plate 13 is formed by a fan-shaped plate member made of a heat-resistant material having an insulating property such as a fluorine resin. The outer diameter of the sector is, for example, about 2 to 3 cm, and a cable insertion hole 13a for inserting the first cable 2c is provided at the center thereof, and the two radial portions (end edges) are provided on the surface side. Engaging claws 13b and 13c that engage with each other are provided on the back side. Although the diameter of the cable insertion hole 13a depends on the outer dimensions of the first cable 2c, for example, approximately 2 to 3 mm is appropriate. The first cable 2c is inserted into the cable insertion hole 13a in the vicinity of the cable insertion hole 11c, and the engagement claw 13b is engaged with the engagement claw 13c as shown in FIG. 13 is formed and attached to the first cable 2c.

  As described above, according to the image display projector 1 of the present embodiment, the hot air diffusion plate 13 attached to the first cable 2c radiates hot air discharged from the gap between the cable insertion hole 11c and the first cable 2c. By diffusing, hot air is not directly applied to the first connector 2d and the second connector 20a. Thereby, the temperature rise of the 1st connector 2d and the 2nd connector 20a is suppressed, and it becomes unnecessary to use an expensive heat-resistant specification connector as the 1st connector 2d and the 2nd connector 20a, and can aim at cost reduction. Further, since the conical hot air diffusion plate 13 is formed by engaging the engaging claws 13b and 13c of the two radial portions of the fan-shaped plate member, the hot air diffusion plate 13 can be formed with an inexpensive and simple configuration. Not only can it be created, but it can also be easily attached to the first cable 2c. Further, since the first connector 2d and the second connector 20a are connected in the vicinity of the cable insertion hole 11c, the image display projector can be reduced in size. Moreover, since the hot-air diffusion plate 13 is made of a heat-resistant material having insulating properties, there is no possibility of a short circuit or the like.

  In addition, this invention is not restricted to the structure of the said embodiment, The hot air diffusion plate 13 should just be attached to the cable for supplying electric power to the lamp unit 2 at least. The present invention can be variously modified. For example, the positions and sizes of the air intake port 11a, the hot air discharge port 11b, and the cable insertion hole 11c are not limited to those shown in FIG.

1 is a block diagram illustrating a configuration of a projector according to an embodiment of the invention. Sectional drawing which shows the structure of the lamp unit of the projector, and its periphery. The expanded view of the hot air diffusion plate with which the 1st cable of the same lamp unit is mounted | worn. The side view which shows the engaging part of the same hot air diffusion plate.

Explanation of symbols

1 projector 2 lamp unit 2c first cable 2d first connector 3 drive circuit 11 lamp case 11c cable insertion hole 12 blower fan 13 hot air diffusion plate 20 second cable 20a second connector

Claims (3)

A lamp unit having a bulb that emits light for image projection, a lamp case that accommodates the lamp unit, a drive circuit that supplies electric power to the lamp unit, and light emitted from the bulb by a digital micromirror device An image forming unit having a function of forming an image by reflection and projecting the formed image onto an external screen, a signal input unit to which image data is input from the outside, and controlling the image forming unit to output the signal A control unit having a function of forming an image based on image data input to the input unit, a first cable extended from the lamp unit to supply power to the lamp unit, and a tip of the first cable A first connector formed on the first cable, a second cable extending from the drive circuit, and a second cable provided at a tip of the second cable, A second connector connected to one connector;
A blower fan for sending air into the lamp case to cool the lamp unit;
The lamp case includes an air intake port for taking in air sent by the blower fan into the lamp case, a hot air discharge port for discharging hot air heated by the lamp unit, and the first cable. In the image display projector having a cable insertion hole for inserting the tip side of the lamp case into the outside of the lamp case,
The first connector and the second connector are connected in the vicinity of the cable insertion hole,
The first cable is mounted with a conical hot air diffusion plate that diffuses hot air discharged from the gap between the cable insertion hole and the first cable,
The hot air diffusion plate is formed in a conical shape by engaging two radial portions of a fan-shaped plate-like member made of a heat-resistant material having insulating properties,
The hot air diffusion plate diffuses the hot air discharged from the gap between the cable insertion hole and the first cable in a radial manner so that the hot air does not directly hit the first connector and the second connector. An image display projector that suppresses temperature rise of a first connector and a second connector. A lamp unit that emits light for image projection, a lamp case that houses the lamp unit, a drive circuit that supplies power to the lamp unit, and an image that is appropriately reflected by the light emitted from the lamp unit An image forming unit for forming and projecting, and a cable extended from the lamp unit for supplying power to the lamp unit;
In the image display projector, the lamp case has a cable insertion hole for allowing the tip end side of the cable to be inserted outside the lamp case.
An image display projector, wherein a hot air diffusion plate for diffusing hot air discharged from a gap between the cable insertion hole and the cable is attached to the cable.   The image display projector according to claim 2, wherein the hot air diffusion plate is formed in a conical shape from a fan-shaped plate-like member and is made of an insulating heat-resistant material.

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