JP4018459B2 - Projector device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projector apparatus that enlarges and projects a light image formed by a light valve onto a screen member.
[0002]
[Prior art]
Conventionally, a coaxial lens is used as means for enlarging and projecting a light image converted by a light valve onto a screen.
[0003]
FIG. 5 shows an outline of a conventional rear projector using a coaxial lens.
[0004]
In FIG. 5, reference numeral 100 denotes an optical engine case incorporating a light valve such as a liquid crystal panel, an illumination lamp, a panel drive circuit, and the like. An image projected from the coaxial projection lens 101 is applied to a screen 103 via a reflection mirror 102. Projected.
[0005]
Since the coaxial lens 101 generally has a plurality of lenses housed in one lens barrel, dust, dust and the like are less likely to adhere to the lens surface, and the projected image is hardly adversely affected.
[0006]
On the other hand, a rear projector that magnifies and projects an optical image from the back onto a transmissive screen has recently been required to have a large screen and a plurality of reflecting mirrors as so-called off-axial optical systems (off-axis optical systems). A rear projector that magnifies and projects on a screen has been proposed.
[0007]
[Problems to be solved by the invention]
However, in the off-axial optical system using the reflection mirror, since the reflection surface is exposed, dust and dust easily adhere to the mirror surface, which is one of the causes of deterioration of the projected image.
[0008]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a projector device that can prevent the image projected on the screen from being deteriorated by preventing dust, dust, and the like from adhering to the mirror surface. Will provide.
[0009]
[Means for Solving the Problems]
To achieve the above object, the present onset bright projector apparatus, a light source for emitting light, a light valve for converting the optical image by switching the light from the light source, the converted coaxial lens by the light valve In a projector device that projects an enlarged light image on a screen by a plurality of curved mirrors,
In the optical path of the plurality of curved mirrors, a mirror box that houses the plurality of curved mirrors so that an air flow is created from the incident side toward the emission side;
A fan for generating the air flow,
The mirror box has a shutter that is pushed up to a position that does not block the emission-side optical path due to a pressure difference between the inside and outside of the mirror box caused by the air flow created by the fan at the emission-side opening of the mirror box, and the shutter is a projector apparatus characterized that you block the exit side opening of said mirror box by its own weight.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0012]
<Embodiment 1>
FIG. 1 is a diagram for explaining the details of an off-axial projection optical system according to the present invention, and FIG. 2 is a diagram showing an outline of a rear projector apparatus employing the off-axial projection optical system according to the present invention.
[0013]
Hereinafter, it demonstrates according to a figure.
[0014]
In FIG. 1, 1 is a transmissive liquid crystal panel as a light valve that switches light from a lamp 2 as a light source and converts it into a light image, 3 is a coaxial lens, and a plurality of curved mirrors 4 as reflective optical elements. 5 and 6, an off-axial projection optical system for enlarging and projecting an image on a screen described later is formed.
[0015]
Reference numeral 7 denotes a box-shaped mirror box for fixing the coaxial lens 3 and the curved mirrors 4, 5, and 6 at predetermined positions.
[0016]
The light image switched by the transmissive liquid crystal panel 1 is projected as a projected image from the exit side opening 8 of the mirror box 7 by the coaxial lens 3 and the curved mirrors 4, 5, 6. An air filter 9 and a fan 10 are provided in the incident side lower opening of the mirror box 7.
[0017]
Reference numeral 11 denotes a shutter provided so as to close the exit-side opening 8 and is attached so as to be rotatable around a fulcrum 11a, and is made of a lightweight member such as resin. The air sucked by the fan 10 is removed from the dust and dust by the air filter 9 and then flows into the mirror box 7. The inflowing air passes through the reflecting surfaces of the curved mirrors 4, 5, 6, and then moves the shutter 11 provided in the exit side opening 8 through the exit side optical path as shown in FIG. Push it up to a position where it will not be blocked.
[0018]
With the above configuration, by operating the fan 10 simultaneously with the lighting of the lamp 2, an air flow is generated in the mirror box from the incident side to the exit side, and entry of dust, dust, etc. from the opening 8 is prevented. Can do.
[0019]
Further, since the operation of the fan 10 is stopped when the lamp 2 is turned off, the shutter 11 closes the exit side opening 8 of the mirror box 7 due to its own weight, so that the rear projector device can be moved into the mirror box 7 when the rear projector device is not used. Dust and dust can be prevented from entering.
[0020]
FIG. 2 is a diagram showing an outline of a rear projector apparatus using an off-axial projection optical system according to the present invention. An image projected from the off-axial optical system 200 is projected onto the transmission screen 13 via the reflection mirror 12. .
[0021]
<Embodiment 2>
FIG. 3 shows another embodiment of the off-axial projection optical system according to the present invention.
[0022]
Hereinafter, the same components as those in the first embodiment in FIG. 1 will be described using the same reference numerals.
[0023]
In FIG. 3, reference numeral 1 denotes a transmission liquid crystal panel as a light valve for switching light from a lamp 2 as a light source to convert it into a light image, and a screen described above by a plurality of curved mirrors 4, 5, and 6 as reflection optical elements. An off-axial projection optical system for enlarging and projecting an image is formed.
[0024]
Reference numeral 7 denotes a box-shaped mirror box for fixing the curved mirrors 4, 5, and 6 at predetermined positions.
[0025]
The light image switched by the transmissive liquid crystal panel 1 is projected from the exit side opening 8 of the mirror box 7 as a projected image by the curved mirrors 4, 5, 6.
[0026]
An air filter 9 and a fan 10 are provided in the incident side lower opening of the mirror box 7.
[0027]
Reference numeral 14 denotes a shutter provided so as to close the exit-side opening 8 and is attached so as to be rotatable about a fulcrum 14a. An end 14 b of the shutter 14 is configured to be movable in the direction of arrow 16 by an electromagnetic solenoid 15.
[0028]
By operating the electromagnetic solenoid 15 simultaneously with the lighting of the lamp 2, the shutter 14 is opened to a position where it does not block the emission side optical path as shown in FIG.
[0029]
At the same time, the air sucked by the fan 10 is removed of dust and dust by the air filter 9 and then flows into the mirror box 7. The inflowing air passes through the reflecting surfaces of the curved mirrors 4, 5, 6 and is then discharged from the exit side opening 8.
[0030]
With the above configuration, the electromagnetic solenoid 15 and the fan 10 are operated simultaneously with the lighting of the lamp 2 to generate an air flow from the incident side to the emission side in the mirror box, and dust, dust, etc. from the opening 8 Can prevent intrusion.
[0031]
Further, when the lamp 2 is turned off, the operation of the electromagnetic solenoid 15 and the fan 10 is also stopped, so that the shutter 14 closes the exit side opening 8 of the mirror box 7 by its own weight, and thus the mirror box 7 when the rear projector is not used. It is possible to prevent dust and dust from entering the inside.
[0032]
<Embodiment 3>
FIG. 4 shows another embodiment of the off-axial projection optical system according to the present invention.
[0033]
Hereinafter, the same components as those shown in FIG. 3 will be described using the same reference numerals.
[0034]
In FIG. 4, reference numeral 1 denotes a transmissive liquid crystal panel as a light valve for switching light from a lamp 2 as a light source to convert it into a light image, and a screen described above by a plurality of curved mirrors 4, 5, 6 as reflective optical elements. An off-axial projection optical system for enlarging and projecting an image is formed.
[0035]
Reference numeral 7 denotes a box-shaped mirror box for fixing the curved mirrors 4, 5, and 6 at predetermined positions.
[0036]
The light image switched by the transmissive liquid crystal panel 1 is projected from the exit side opening 8 of the mirror box 7 as a projected image by the curved mirrors 4, 5, 6. An air filter 9 is provided in the incident side lower opening of the mirror box 7.
[0037]
Reference numeral 17 denotes a cooling fan for the lamp 2.
[0038]
A shutter 14 is provided so as to close the exit-side opening 8 and is attached to be rotatable about a fulcrum 14a. An end 14 b of the shutter 14 is configured to be movable in the direction of arrow 16 by an electromagnetic solenoid 15.
[0039]
By operating the electromagnetic solenoid 15 simultaneously with the lighting of the lamp 2, the shutter 14 is opened to a position where it does not block the emission side optical path as shown in FIG.
[0040]
At the same time, the air after the lamp cooling by the lamp cooling fan 17 is carried to the incident side bottom opening of the mirror box 7 by the guide member 18, dust and dust are removed by the air filter 9, and then flows into the mirror box 7. The inflowing air passes through the reflecting surfaces of the curved mirrors 4, 5, 6 and then is discharged from the exit side opening 8.
[0041]
With the above configuration, by operating the electromagnetic solenoid 15 and the fan 17 simultaneously with the lighting of the lamp 2, an air flow is generated in the mirror box from the incident side to the emission side, and dust, dust, etc. Intrusion can be prevented.
[0042]
Further, since the operation of the electromagnetic solenoid 15 and the fan 17 is stopped when the lamp 2 is turned off, the shutter 14 closes the exit side opening 8 of the mirror box 7 by its own weight, so that the mirror box 7 when the rear projector is not used is used. It is possible to prevent dust and dust from entering the inside.
[0043]
In this embodiment, the air after cooling the lamp is allowed to flow from the incident side bottom opening of the mirror box 7. However, the present invention is not limited to this, and air flow is created inside the mirror box 7 by natural convection. Also good.
[0044]
<Embodiment 4>
In the first to third embodiments, a transmissive liquid crystal panel is used as a light valve for switching light from the lamp 2 as a light source to convert it into a light image. A so-called DMD micromirror device may be used.
[0045]
【The invention's effect】
As described above, according to the present invention, in an off-axial projection optical system using a reflecting mirror, it is possible to prevent dust and dust from adhering to the reflecting mirror surface, thereby preventing projection image deterioration. It became.
[0046]
The reflection mirror used in the off-axial projection optical system is formed of a curved surface and is usually made by resin molding, but its expansion coefficient is about 7 to 8 times that of glass, and thermal expansion due to temperature changes. Greatly affects the shape of the mirror curved surface, which may cause image distortion. According to the present invention, since an air flow is created on the mirror surface, there is also an effect of cooling the reflecting mirror, and it is also possible to prevent image distortion due to thermal expansion deformation of the mirror curved surface.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating details of an off-axial projection optical system according to the present invention.
FIG. 2 is a diagram showing an outline of a rear projector apparatus employing an off-axial projection optical system according to the present invention.
FIG. 3 is a diagram showing another embodiment of an off-axial projection optical system according to the present invention.
FIG. 4 is a diagram showing another embodiment of the off-axial projection optical system according to the present invention.
FIG. 5 is a diagram showing an outline of a conventional rear projector using a coaxial lens.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transmission type liquid crystal panel 2 Lamp 3 Coaxial lenses 4-6 Reflection mirror 7 Mirror box 8 Emission side opening part 9 Air filter 10 Fan 11 Shutter 13 Transmission type screen 100 Conventional projection system coaxial lens

Claims (1)

A light source for emitting light, a light valve for converting the optical image by switching the light from the light source, an optical image that has passed through the converted coaxial lens by the light valve surface mirror of multiple depending on the screen In a projector device for enlarging projection,
A mirror box for housing said plurality of curved mirrors as the optical path of the curved mirror of the multiple, the flow of air towards the exit side from the entrance side is made,
A fan for generating the air flow,
The mirror box has a shutter that is pushed up to a position where the light path on the emission side is not obstructed by the pressure difference between the inside and outside of the mirror box caused by the air flow generated by the fan at the exit side opening of the mirror box, and the shutter projector apparatus characterized that you block the exit side opening of said mirror box by its own weight.

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