JP2001174920A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector light in weight, compact in structure and improved in portability by arranging a suction fan and an exhaust fan in order to cool the inside of a projection type display device without restricting the shape of a housing. SOLUTION: By arranging a light source device left backward with respect to a projection lens differently from the conventional device, the suction fan is arranged in a space saving state to secure the degree of freedom in terms of designed shape and the reduction of occupancy space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device of a projection type display device (projector) for projecting an image on a screen, a light source used in the optical device, an exhaust port for releasing heat from the light source, and a cooling device. It relates to the arrangement of intake fans and their intake ports.

[0002]

2. Description of the Related Art FIG. 4 shows the inside of a conventional projection display device. In the figure, 1 is a projection lens, 2 is an optical device composed of optical system components for transmitting light from a light source to the projection lens, 3 is a light source device, 4 is an intake fan, 4
a is an intake port, 5 is an exhaust fan, and 5a is an exhaust port. Conventionally, a light source attached to an optical device of a projector is usually provided on the right rear of the projection lens 1 as shown in FIG. 1 due to the advantage of the arrangement with respect to the shape (design) of the housing and the ease of ergonomic handling. The light source device 3 and the exhaust port 5a are arranged.

In some models, the light source device 3 is arranged on the left side of the projection lens. However, as shown in FIG. 5, the light source device 3 and the exhaust port 5a are arranged in the side direction of the optical axis of the projection lens. The overall shape is horizontally long.

[0004]

In view of the functions of the intake fan and the exhaust fan, it is desirable that the intake port and the exhaust port are arranged near the surface of the housing so as to be in direct contact with the outside air. Further, the optical component requiring cooling is usually arranged on the optical axis of the projection lens immediately after the lens. Due to these restrictions, an axial fan is conventionally disposed as a suction fan on the bottom surface of the optical device 2, and the intake surface 7 of the intake fan projects from the bottom surface of the optical device 2 as shown in FIG. The structure was such that the height of the body could not be lowered.

In the case where an intake fan is arranged at a position other than the bottom surface of the housing of the projector, it is advantageous in terms of the space of the optical device to arrange the intake fan in the side direction of the projection lens. In addition, since optical components that must be cooled are inside the optical device 2, an air guide path for guiding cooling air from the intake fan is required. Therefore, it is conceivable to use a multi-blade fan (for example, a sirocco fan) that has a large blowing pressure and is advantageous for silent operation in order to simplify the air guide path. However, since the general sirocco fan has only one positional relationship between the air intake and the air vent, the conventional arrangement of the light source device in the projector and the exhaust port has a distance to the housing surface, which poses a design problem. Was.

As shown in FIG. 5, an intake fan 4 is arranged on the side of the projection lens 1, and an exhaust port of the exhaust fan 5 for the light source device 3 is arranged on the opposite side of the projection lens with the exhaust port facing the front. However, the main body of the projection display device becomes horizontally long, which causes a problem in handling. Further, the exhaust heat drifts to the front of the projection lens 1, and the heat may cause air fluctuations, which may adversely affect the projected image.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has a high degree of freedom in the shape of a housing without adversely affecting the performance of an optical device and a light source device. It is an object of the present invention to provide a projection type display device which is lightweight, compact and has improved portability.

[0008]

According to a first aspect of the present invention, there is provided a projection display apparatus including a projection lens provided with an emission section exposed from a front surface of a housing, and an optical system connected to a rear portion of the projection lens. And a light source provided behind the projection lens and transmitting light to the projection lens via the optical system means, and an exhaust provided on one side of the housing and discharging at least heat generated from the light source. A fan and an intake fan for cooling the inside of the housing, provided on the side surface opposite to the side surface of the housing provided with the exhaust fan in the vicinity of the projection lens. is there.

[0009] In a projection type display device according to a second aspect of the present invention, the exhaust fan is provided at a rear portion of the housing, and the intake fan is provided at a front portion of the housing.

In the projection type display device according to a third aspect of the present invention, the intake fan includes a plurality of blades, an intake port for performing intake from a direction perpendicular to a rotation axis for rotating the blades, And a blow port for blowing air in the rotation direction.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a projection display device according to the present invention. In the figure, 1 is a projection lens, 2 is an optical device composed of optical components for transmitting or blocking light from a light source to the projection lens 1, 3 is a light source device, and 4 is an inside of a projection display device. An intake fan for cooling, 4a is an intake port, 5
Is an exhaust fan for exhausting heat generated in the housing, the optical component 2 and the light source device 3 to the outside of the housing, 5a is an exhaust port,
Reference numeral 8 denotes a housing which has a vertically long shape in the optical axis direction of the projection lens 1, and actually covers not only the lower surface but also the upper surface so as to hide the internal configuration as shown. FIG.
(B) shows an example of mounting an intake fan.
In the figure, reference numeral 4b denotes an air outlet of an intake fan (for example, a sirocco fan).

Hereinafter, a specific description will be given. As shown in FIG. 1, the projection display device includes a light source device 3 behind a projection lens 1.
Has a vertically long shape. In the projection type display device according to the present embodiment, the light source device which has conventionally been disposed on the right rear of the projection lens is disposed on the left rear of the projection lens 1 as shown in FIG. An exhaust port of an exhaust fan 5 that exhausts heat from a light source device or the like is provided on the left side surface of the housing 8.

In order to cool the projection display device, it is necessary to blow air into the device. In this case, a silent sirocco fan having a large blowing pressure and a low air pressure is used as an intake fan. The sirocco fan is provided with a plurality of blades, an air inlet for sucking air from a direction perpendicular to a rotation axis for rotating the blades, and an air outlet for blowing air in the rotation direction of the blades. In general-purpose sirocco fans, the positional relationship between the suction port and the blow port is determined to be one, and it is necessary to effectively cool the optical system component 2 that takes heat by transmitting light from a light source to a projection lens. Therefore, the way of attaching the exhaust fan is restricted as shown in FIGS. As described above, the light source device 2 is
2 (a) to 2 (d) regarding the mounting position of the intake fan when the fan is provided on the left rear side of FIG.
Sirocco fan (intake fan) for optical system component 2
Figure 2 (a)
Arrangement is optimal. By the way, the air inlet and the air outlet are provided at one specific position in the direction in which the blade rotates, and have a positional relationship such as the air inlet 4a and the air outlet 4b as shown in FIG.

FIG. 3 is a view showing a state in which a light source is arranged on the right rear side of the projection type display device, and an intake fan is similarly arranged on the right side of the projection lens, that is, on the right front side of the projection type display device. Here, consider a case where the light source device 3 is arranged on the right rear side in the arrangement shown in FIG. When the intake fan 4 is arranged on the right side of the projection lens 1 as shown in FIG. 2A, the intake port of the intake fan 4 is separated from the side surface of the housing as shown in FIG.
It will have dead space. Alternatively, FIG.
As shown in (b), the side surface of the housing needs to be partially dented so that the suction port of the intake fan 4 and the side surface of the housing are in contact with each other. Would.

On the other hand, the projection type display device shown in FIG. 1 is viewed from the projection lens side with respect to the optical axis of the projection lens.
A light source device 3, an exhaust fan 5, and an exhaust port 5
a, and further, by arranging an intake fan 4 on the right front of the housing 8 on the right side of the projection lens 1, space can be saved, and air can flow from the intake port 4a to the exhaust port 5a. The inside of the housing such as the optical device 2 and the light source device 3 can be effectively cooled. The air sucked in from the air inlet 4a is blown into the projection display device from the air blow port 4b of the air intake fan 4. The air blown from the blower opening 4b is sent to the optical device 2, the light source device 3, and the like along a wind guide path in the device. Then, the air is exhausted from the exhaust fan 5 to the outside of the apparatus. Thus, the air sucked from the intake fan cools the inside of the apparatus (the optical device 2, the light source device 3, and the like). In the case of FIG. 1, the intake port 4a of the intake fan 4 and the exhaust port 5a of the exhaust fan 5 are provided at opposite positions. Further, an exhaust port 5a of the exhaust fan 5 is provided on the left rear side of the projection lens 1 and at the rear of the casing 8, and an intake port 4a of the intake fan 4 is provided on the right side of the projection lens 1 and on the right side of the front of the casing. Thus, the position of the exhaust port 5a and the position of the intake port 4a can be separated, and it is possible to prevent the hot air discharged from the exhaust port 5a from being sucked from the intake fan. Further, the exhaust port 5a is provided at a position behind and far from the projection lens 1, so that the hot air discharged from the exhaust port 5a does not drift near the projection lens 1, and this hot air is projected from the projection lens 1. It does not affect the image that is displayed. Further, by arranging the intake port of the intake fan 4 and the exhaust port 5a of the light source device exhaust fan 5 symmetrically with respect to the optical axis of the projection lens 1, the degree of freedom in housing design can be increased.
As described above, by arranging the intake fan and the exhaust fan for cooling the inside of the projection display device without restricting the shape of the housing, the device can be made lightweight and compact, and the portability can be improved. It is possible to provide a projection display device (projector) in which the image quality is improved.

[0016]

According to the first aspect of the present invention, the projection lens provided with the emission section exposed from the front surface of the housing, the optical system means connected to the rear of the projection lens, and the rear of the projection lens. A light source for transmitting light to the projection lens via the optical system means, an exhaust fan for discharging at least heat generated from the light source provided on one side surface of the housing, and a vicinity of the projection lens By providing an intake fan for cooling the inside of the housing provided on a side surface opposite to the side surface of the housing provided with the exhaust fan, the optical performance of the projection display device is improved. The light source and the exhaust fan can be arranged without affecting the device, and the design of the housing is not restricted and a space-saving device configuration can be achieved.

According to the second aspect, the exhaust fan is provided at the rear of the housing, and the intake fan is provided at the front of the housing. Can be arranged symmetrically with respect to the optical axis, and the intake fan and the exhaust fan can be arranged separately, so that the influence of the exhaust fan cannot be exerted on the intake fan.

According to the third aspect of the present invention, there is provided an intake fan comprising: a plurality of blades; an intake port for performing intake from a direction perpendicular to a rotation axis for rotating the blades; And a blower port for performing the above operation, the intake fan can be functionally arranged, and further space saving can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a projection display device according to the present invention.

FIG. 2 is a diagram showing an example of mounting an intake fan.

FIG. 3 is a diagram showing a comparative example with respect to the embodiment of the projection type display device according to the present invention.

FIG. 4 is a diagram showing a conventional projection display device.

FIG. 5 is a view showing a conventional projection display device.

FIG. 6 is a diagram showing a conventional projection display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Projection lens, 2 Optical device, 3 Light source device, 4 Intake fan, 5 Exhaust fan, 7 Intake surface, 8 Housing

Claims (3)

[Claims] A projection lens provided to expose an emission section from a front surface of a housing; an optical system connected to a rear portion of the projection lens; and a projection lens provided rearward of the projection lens. A light source for transmitting light to the projection lens through the light source; an exhaust fan provided on one side surface of the housing for discharging at least heat generated from the light source; and an exhaust fan provided near the projection lens. A projection display device comprising: a suction fan provided on a side surface of the housing opposite to the side surface of the housing for cooling the inside of the housing. 2. The projection display device according to claim 1, wherein the exhaust fan is provided at a rear portion of the housing, and the intake fan is provided at a front portion of the housing. 3. An intake fan, comprising: a plurality of blades; an intake port for performing intake from a direction perpendicular to a rotation axis for rotating the blades; and an air outlet for blowing air in the rotational direction of the blades. 3. The projection type display device according to claim 1, further comprising: