JPH0659247A - Projection type image display device - Google Patents

Abstract

PURPOSE:To unnecessitate detaching a filter for every cleaning time by providing the filter sufficiently large and removably for an intake air opening and to eliminate labor and time for exchanging the filter and to maintain cooling performance by retreating a part where performance passing air is deteriorated from the intake air opening. CONSTITUTION:A dustproof filter 15 is held therebetween so as to be movable along a filter supporting click part 16 and supported between the filter supporting click part 16 provided on a casing 6 between the intake air opening provided on the side wall of the casing 6 and a cooling fan and the side wall of the casing 6. At this time, an arm part 17 prolonging from the dustproof filter 15 is prolonged out of the casing 6 through an operation window 18 provided on the casing 6, and by operating the arm part 17, the dustproof filter 15 is moved along the side part of the casing 6. In such a constitution, by moving a corresponding filter part to the intake air opening provided on the side wall of the casing 6 by operating the arm part 17, a period cleaning and exchanging the dustproof filter 15 is prolonged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display element of a projection type image display apparatus, or a dustproof filter for preventing dust from entering when air is taken in to cool a light source of the image display element, and its peripheral structure. .

[0002]

2. Description of the Related Art With the increase in size of televisions, the demand for projection-type image display devices is increasing because they can more easily cope with the increase in size than conventional direct-view image display devices.

The basic configuration of the projection type image display device obtains a large screen image by enlarging an image reproduced on an image display element by a projection lens. In order to make this possible, a high-luminance image is required, but at the same time, the heat generated thereby deteriorates the image. Therefore, by providing a fan, the outside air is taken in from the intake port provided in the housing, the heat radiating unit is cooled, and then discharged from the exhaust port also provided in the housing.

[0004]

When the outside air is taken in in the above-mentioned structure, the surrounding dust is also guided at the same time. If this dust adheres to the image display area, the image quality deteriorates, or if it accumulates, it may lead to ignition if a high-temperature area or high-voltage area discharges to the surrounding area. Equipped with a dust filter.

However, if a large amount of dust adheres to this dustproof filter, the air permeability will deteriorate and the cooling performance of the device will deteriorate. Therefore, it is necessary to remove the dust adhering to the filter after using the device for a certain period of time. It was Therefore, especially in the case of the ceiling-mounted projection type, it has been very troublesome to maintain and manage.

[0006]

According to the present invention, at least an image display element, a projection lens capable of enlarging and projecting an image of the image display element, an electric circuit for driving the image display element, and a cooling element. The above-mentioned problem because it is composed of a fan, a dust-proof filter, and a housing containing these components inside and having an intake port, and the filter is sufficiently movable with respect to the intake port. To improve.

Further, the dustproof filter is characterized in that it has a disc shape and is provided so as to be rotatable, and is characterized in that it has a band shape and is provided with a guide shaft that can be wound up. Maintenance can be facilitated by taking the configuration.

Further, the present invention is characterized in that an actuator for moving the dust-proof filter with respect to an intake port provided in the housing is provided, and the actuator is fixed during the time when an image is displayed on the image display device. The configuration is characterized in that the dust filter is moved at a speed, or the actuator is characterized in that the dust filter is moved by a certain amount when power is applied, or the actuator is The above problem can be solved by adopting a configuration characterized in that the dustproof filter is moved at a constant speed while the cooling fan is rotating.

The image display element is composed of an image display section and a light source section, and is provided with an actuator for moving the dustproof filter with respect to an intake port provided in the housing. The above problems can be solved by adopting a configuration characterized in that the dustproof filter is moved at a constant speed while the light source is on. Further, a timer for measuring the usage time of the light source is provided with a means for clarifying the replacement time or cleaning time of the dustproof filter, which is more convenient.

[0010]

In the projection type image display device for enlarging and projecting the image displayed on the image display element by the projection lens, in order to secure sufficient brightness even when enlarging, the image display element is a very bright object. It goes without saying that it needs to be. However, it is not realistic that all the electric power applied to the image display element becomes light, and much becomes heat. In addition, the light emitted from the image display element in a portion that cannot be picked up by the internal projection optical system is absorbed inside the device and becomes heat. The heat deteriorates the performance of the image display element itself or the projection lens.
Therefore, a fan is provided for this cooling, and a dustproof filter is provided at the same time to prevent dust from entering when the outside air is taken in through the intake port provided in the housing. However, in a long-term environment or in an environment with much dust, the air permeation performance of the filter deteriorates, and sufficient cooling cannot be performed.

In the present invention, since the filter is provided to be sufficiently large and movable with respect to the intake port, the air permeation performance is deteriorated without removing and cleaning the filter each time as in the conventional case. By retreating the part from the intake port, the cooling performance can be maintained without the trouble of replacing the filter. The shape of this dustproof filter is considered to be several as shown below.

The first structure is a disk-shaped structure that is rotatably provided, and is arranged so that the outside air taken in from the intake port passes through a portion other than the center thereof.

Secondly, a guide shaft is formed in a strip shape so as to be able to be wound up, so that the outside air taken in from the intake port passes through the filter before the filter is wound up by the guide shaft. By taking the configuration provided, it is possible to achieve the above-mentioned action.

Further, by providing an actuator for retracting the dustproof filter with respect to the intake port provided in the casing, in performing the above-mentioned action, remote operation is also possible, which is more convenient. In particular, regarding the two-body type projection image display device, which is a ceiling-mounted type or a device installed at a high place, the maintenance becomes very large, and thus the benefits to these are considered to be particularly great.

In addition to this, as a first means, the actuator is characterized in that the dustproof filter is moved at a constant speed while an image is displayed on the image display element.

Alternatively, as a second means, the actuator is configured to move the dustproof filter by a predetermined amount when electric power is applied.

As a third means, the actuator moves the dustproof filter at a constant speed while the cooling fan is rotating, so that the dustproofing and cooling can be automatically and efficiently prevented without obstructing ventilation. Can be possible.

Further, in the case where the image display element is composed of the image display section and the light source section, it is characterized in that it is provided with an actuator for moving the dustproof filter with respect to the intake port provided in the housing. It goes without saying that the above-mentioned problems can be solved by adopting a structure in which the actuator moves the dustproof filter at a constant speed while the light source is on.

Further, the timer for measuring the usage time of the light source makes it possible to always perform proper cooling by clarifying the replacement or cleaning time of the dustproof filter, and it is possible to provide a good image.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the structure of a two-body projection type image display device, and FIG. 2 is a partially enlarged view of the embodiment shown in FIG. Reference numeral 1 denotes an image display element, and the image display element drive circuit 3 emits light by itself through a power supply circuit 2, and an image by a signal processing circuit 5 is displayed on an image display surface 4 thereof. This image is enlarged and projected on a screen 9 arranged in front of the apparatus by a projection lens 8 held by a lens barrel 7 screwed into a housing 6.

Since the image display element 1 emits light with high brightness, the temperature around the image display element 1 rises significantly, and the projection image is deteriorated due to the deterioration of the optical characteristics of the projection lens 8 and the performance deterioration of the image display element 1 itself. Image quality is deteriorated. In order to suppress this, a cooling fan 12 that takes in outside air into the housing from an intake port 10 provided on the side wall of the housing and also discharges heat from an exhaust port 11 provided on the side wall of the housing is a fan support metal fitting 13. It is fixed to the housing 6 by.

The cooling fan 12 is driven by a fan drive control circuit 14 connected to the power supply circuit 2. However, since dust outside is also sucked at the same time during intake, a dust filter 15 is provided to prevent the ingress of dust, and the intake port 10 provided on the side wall of the housing and the cooling fan 1 are provided.
The filter supporting claw portion 16 provided in the housing 6 between the two and the side wall of the housing are movably sandwiched and supported along the filter supporting claw portion 16.

At this time, the arm portion 17 extending from the dustproof filter 15 extends to the outside of the casing through the operation window 18 provided in the casing 6, and by operating the arm portion 17, the dustproof filter is formed. 15 can be moved along the side wall of the housing.

With such a structure, in the conventional projection type image display device, it is necessary to clean or replace the dustproof filter after long-term use and after use in a dusty environment. By operating the part 17 from the outside to move the filter part corresponding to the intake port 10 provided on the side wall of the housing, it is possible to significantly extend the cleaning or replacement cycle of the dustproof filter as compared with the conventional configuration. Become.

According to the above embodiment, the shape of the dustproof filter 15 is rectangular, but the shape is not limited to this.
FIG. 3 shows a second embodiment of the present invention in which the shape of the dustproof filter is circular. Here, the dustproof filter 19 has a disk-like shape, and is provided with a guide hole 20 at its center and a gear 21 on its outer periphery.

The dustproof filter 19 includes a filter guide hole 22 and a filter guide shaft 23 provided in the housing 6.
Is rotatably attached to the side wall of the housing 6.
Further, its position is determined so that the intake port 10 is provided on the side wall of the housing 6 corresponding to a part of the filter portion of the dustproof filter 19 as shown in the figure. A small gear 24 meshes with the gear 20.

The small gear 24 penetrates a gear guide hole 25 provided in the housing 6, and a handle 26 is provided from the opposite side of the housing 6.
Since the handle 26 is fixed from the outside of the device, the dust filter 1 is passed through the small gear 24.
It is possible to rotate 9 around the filter guide shaft 23. As a result, even if the positions of the intake port 10 and the dustproof filter 19 are changed, the convenience of maintenance can be greatly improved as compared with the conventional configuration.

FIG. 4 shows a third embodiment of the present invention. Here, as shown in the figure, the dustproof filter 27 has a strip shape, and a first guide shaft 28 around which the dustproof filter 27 is wound in advance is attached to one end thereof, and a second guide shaft 29 is attached to the other end thereof. ing. The guide shaft is supported on a side wall of the housing 6 by a guide shaft support fitting 30 that rotatably fixes the guide shaft. At this time, the outside air sucked from the intake port 10 provided on the side wall of the housing 6 is arranged so as to pass through the filter portion between the first guide shaft 28 and the second guide shaft 29.

A flange portion 31 provided on the second guide shaft 29 is an operation window 32 provided on a side wall of the housing 6.
Is projected to the outside of the side wall. With such a structure, even if the dustproof filter 27 is clogged with dust, the flange portion 31 is rotated to guide the filter portion without clogging, thereby maintaining the air permeability and the cooling performance. It becomes possible.

In the above-described embodiment, the time and labor required for filter replacement and cleaning can be reduced, but a more convenient fourth embodiment is shown in FIG.

This structure is the same as the conventional structure shown in FIG. 1 except for the periphery of the dustproof filter. Figure 5 there
As in the first embodiment, between the filter support claw portion 16 provided on the housing 6 and the housing side wall between the intake port 10 and the cooling fan 12 provided on the side wall of the housing 6 as in the first embodiment. A rack portion 34 is formed at an end of the dustproof filter 33 that is movably sandwiched and supported along the filter support claw portion 16. A pinion gear 37 fixed to a rotation shaft of a motor 36 supported by a motor support fitting 35 is meshed with the side wall of the housing 6 in the rack portion 34. The motor 36 is connected to a motor drive circuit 38. The motor drive circuit 38 is connected to a switch 39 provided on the side wall of the housing 6 and a remote control light receiver 40. By operating these, it is possible to rotate the motor 36 and move the dustproof filter 33.

With this configuration, the cooling performance can be easily maintained even when the projection type image display device is used for a long time. In particular, in the two-body type projection image display apparatus, particularly for a ceiling-mounted type, it becomes possible to greatly improve the maintenance work because the remote controller can be operated. In this embodiment, the filter shape is the same as that of the first embodiment, but it goes without saying that the filter shape can be applied to the second and third embodiments.

A fifth embodiment is shown in FIG. 6 as a further improvement in the embodiment having the actuator. Most of the structure is similar to that of the fourth embodiment, but the motor 36 is rotated by the motor control circuit 41.
The dustproof filter 33 is moved at a constant speed only while the image is displayed on the image display element. With this configuration, a person can automatically maintain the performance of the filter without paying particular attention to the cleaning and replacement time of the filter.

Further, in the sixth embodiment shown in FIG. 7, a cheaper solenoid 42 is used instead of the motor 36 of the above embodiment, and the solenoid 42 is used when power is applied to the power supply circuit 2 by the solenoid drive circuit 43. The pinion gear 44 fixed to the rotating shaft of is rotated by a certain angle to move the dustproof filter by a certain amount. As a result, the ventilation performance of the filter can be maintained at a lower cost than in the fifth embodiment. Here, a solenoid is used as the actuator, but needless to say, a motor can be used.

In the fifth and sixth embodiments, actuator drive circuits are provided respectively, but in the seventh embodiment shown in FIG. 8, the power source of the motor 36 in the fifth embodiment is the fan drive control circuit. 14, the motor 36 is configured to move the dustproof filter 33 at a constant speed while the cooling fan is rotating, and the actuator drive circuit is omitted to achieve the same effect as the above embodiment. Can be expected.

Further, the eighth embodiment shown in FIGS. 9 and 10 is an effective example when the image display element is constituted by a light source section and an image display section. The configuration is shown below.

Reference numeral 45 denotes a light source, which is made to emit light by a light source drive circuit 47 which is supplied with power from a power supply circuit 46. The light emitted from the light source 45 is guided by the reflector 48 to the image display element 50 which is a light valve on which an image is displayed by the signal processing circuit 49. This image is enlarged and projected on a screen 54 arranged in front of the apparatus by a projection lens 53 held by a lens barrel 52 screwed into a housing 51. Since the light source 45 emits light with high brightness, the image display element 5 around and around the light source 45 transmits light.
In the vicinity of 0, the temperature rises significantly and the projection lens 5
The deterioration of the optical characteristics of No. 3 and the deterioration of the performance of the image display element 50 impair the quality of the projected image.

In order to suppress this, a cooling fan 57 that takes in outside air into the housing from an intake port 55 provided on the side wall of the housing and also discharges heat from an exhaust port 56 provided on the side wall of the housing is a fan. The housing 51 is supported by the support fitting 58.
It is fixed to. The cooling fan 57 has a power supply circuit 46.
It is driven by a fan drive control circuit 59 connected to. However, since the outside dust is also sucked in at the time of intake, in order to prevent the dust from entering, the dust filter 6
0 is movable along the filter supporting claw portion 61 between the filter supporting claw portion 61 provided on the housing 51 and the side wall of the housing between the intake port 55 provided on the side wall of the housing and the cooling fan 57. It is sandwiched and supported.

A rack portion 62 is formed at the end of the dustproof filter 60. A housing 51 is provided in the rack portion 62.
A pinion gear 65 fixed to the rotation shaft of a motor 64 supported by a motor support fitting 63 meshes with the side wall of the. The motor 64 is connected to a motor drive circuit 66. The motor drive circuit 66 is supplied with electric power from the power supply circuit 46 and is also connected to the light source drive circuit 47.

Since the characteristics of the light source 45 deteriorate with the time of use, the light source drive circuit 47 has a built-in timer so that a warning is displayed when the life of the light source is approaching. The motor drive circuit 66 connected to this is the motor 64 while the light source is on.
Is driven at a constant speed, and the timer of the light source drive circuit 46 can be used to display the filter replacement time.

According to the above-mentioned embodiments, the dustproof filter needs to be replaced or cleaned at some time even if the replacement time can be greatly extended. Therefore, by constructing in this way, it is possible to display the life of the light source. By using the timer provided for that purpose, it is possible to clarify the replacement or cleaning time of the filter while suppressing the cost increase.

[0043]

According to the present invention, at least an image display element, a projection lens capable of magnifying and projecting an image of the image display element, an electric circuit for driving the image display element, and a cooling fan. , A dust-proof filter and a housing having these components inside and provided with an intake port, and the filter is sufficiently large with respect to the intake port, and is movably provided so that The cooling performance can be maintained without the trouble of replacing the filter by retracting the part where the air permeation performance is deteriorated from the intake port without removing the filter and cleaning each time.

When the dustproof filter has a disc shape and is rotatably provided, or the dustproof filter has a belt-like shape and a guide shaft is provided so that the dustproof filter can be wound, it is possible to replace the filter. Can be significantly extended.

Further, by providing an actuator for moving the dustproof filter with respect to the intake port provided in the case, the cooling performance can be maintained by a remote switch such as a remote controller. Thereby, it is possible to facilitate the maintenance of the ceiling-mounted two-body projection type image display device. Further, the actuator moves the dustproof filter at a constant speed during the time when the image is displayed on the image display device, the actuator moves the dustproof filter by a certain amount when power is applied, and the actuator cools the cooling. By moving the dustproof filter by an amount corresponding to the time during which the fan for use is rotating, the cooling performance can be automatically maintained for a long period of time without human intervention.

In the projection type image display device in which the image display element is composed of the image display section and the light source section, especially the actuator moves the dustproof filter at a constant speed when the light source is turned on to measure the replacement time of the light source. A timer can be used together to inform when the filter needs to be replaced, and proper images can always be provided to provide a good image.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of a two-body type projection image display device according to the present invention.

FIG. 2 is a partially enlarged view of the first embodiment of the two-body projection type image display device according to the present invention.

FIG. 3 is a partially enlarged view of the second embodiment of the two-body projection type image display device according to the present invention.

FIG. 4 is a partially enlarged view of the third embodiment of the two-body projection type image display device according to the present invention.

FIG. 5 is a partially enlarged view of the fourth embodiment of the two-body projection type image display device according to the present invention.

FIG. 6 is a partially enlarged view of the fifth embodiment of the two-body projection type image display device according to the present invention.

FIG. 7 is a partially enlarged view of a sixth embodiment of the two-body projection type image display device according to the present invention.

FIG. 8 is a sectional view of a seventh embodiment of a two-body type projection image display device according to the present invention.

FIG. 9 is a sectional view of an eighth embodiment of a two-body type projection image display device according to the present invention.

FIG. 10 is a partially enlarged view of an eighth embodiment of the two-body projection type image display device according to the present invention.

[Explanation of symbols]

 1, 50 Image display device 2, 46 Power supply circuit 3 Image display device drive circuit 4 Image display surface 5, 49 Signal processing circuit 6, 51 Housing 7, 52 Lens barrel 8, 53 Projection lens 9, 54 Screen 10, 55 Air intake Port 11, 56 Exhaust port 12, 57 Cooling fan 13, 58 Fan support fitting 14, 59 Fan drive control circuit 15, 19, 27, 33, 60 Dust filter 16, 61 Filter support claw portion 17 Arm portion 18, 32 Operation window 20 Guide Hole 21 Gear 22 Filter Guide Hole 23 Filter Guide Shaft 24 Small Gear 25 Gear Guide Hole 26 Handle 28 First Guide Shaft 29 Second Guide Shaft 30 Guide Shaft Support Fitting 31 Flange 34, 62 Rack 35, 63 Motor support bracket 36, 64 Motor 37, 44, 65 Pinion gear 38, 66 Motor drive circuit 39 switch 40 remote control light-receiving part 41 motor control circuit 42 solenoid 43 solenoid drive circuit 45 light source 47 light source drive circuit 48 reflector

Claims (9)

[Claims] 1. At least an image display device, a projection lens capable of enlarging and projecting an image of the image display device, an electric circuit for driving the image display device, a cooling fan, and a dustproof filter. A projection-type image display device, comprising: a housing having these components inside and having an intake port, and the filter is movably provided with respect to the intake port. 2. The projection type image display device according to claim 1, wherein the dustproof filter has a disc shape and is rotatably provided. 3. The dustproof filter has a strip shape,
The projection type image display device according to claim 1, wherein a guide shaft is provided so as to be wound up. 4. The projection type image display device according to claim 1, further comprising an actuator for moving the dustproof filter with respect to an intake port provided in the housing. 5. The projection type image display apparatus according to claim 4, wherein the actuator moves the dustproof filter at a constant speed while an image is displayed on the image display element. 6. The projection type image display apparatus according to claim 4, wherein the actuator moves the dustproof filter by a predetermined amount when electric power is applied. 7. The projection type image display apparatus according to claim 4, wherein the actuator moves the dustproof filter at a constant speed while the cooling fan is rotating. 8. A liquid crystal panel, a light source that illuminates an image on the liquid crystal panel, a light source drive circuit that drives the light source, and a projection lens that is capable of enlarging and projecting the image on the liquid crystal panel. It consists of an electric circuit for driving the liquid crystal panel, a cooling fan, a dustproof filter, an actuator for moving the dustproof filter, and a housing having these components inside and having an intake port, and The projection type image display device, wherein the filter is sufficiently large and movable with respect to the intake port, and the light source drive circuit is provided with a timer for measuring the life of the light source. 9. The actuator has means for moving the dustproof filter at a constant speed when the light source is turned on, and means for clarifying a replacement or cleaning time of the dustproof filter by a timer provided in the light source drive circuit. The projection type image display device according to claim 8, further comprising: