JP2003233134A - Projection display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp housing structure which never comes into contact with a high-temperature part when a projection lamp is replaced for a projection display device which modulates the projection light from the projection lamp by a light valve and enlarges and projects it by a projection lens. <P>SOLUTION: The projection display device comprising a light source, the projection lamp composed of an elliptic reflector having an elliptic reflecting surface, a lamp housing which entirely covers the projection lamp, the light valve which modulates the irradiation light from the projection lamp, and a projection means of projecting the light modulated by the light valve on a screen so that the center of light emission of the projection lamp is arranged nearby the first focus of the elliptic reflector is characterized in that the lamp housing includes an opening part for projection light arranged nearby the second focus of the elliptic reflector and does not have an opening through which the projection lamp can be touched directly with a hand from outside and the projection lamp when replaced can be taken out of the device together with the lamp housing. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enlarges and projects light modulated by a display device of a light valve to display an image.
The present invention relates to a projection display device.

[0002]

2. Description of the Related Art Conventionally, metal halide lamps and xenon lamps have been used as light sources for projection type display devices. In particular, metal halide lamps have high efficiency, long life, excellent color rendering properties, and by making the distance between electrodes short (short arc), it is possible to approach a point light source. A metal-halide lamp with a reflecting mirror, which has a metal-halide lamp incorporated in a reflecting mirror to improve the light collection efficiency, is widely used as a light source of a projection type display device.

FIG. 7 is a schematic diagram showing the construction of a conventional projection type display device D2, and FIG. 8 is a schematic diagram showing the mounting structure of a metal halide lamp with a reflecting mirror in D2.

The projection type display device D2 includes a metal halide lamp tube 1, an elliptical reflecting mirror 2 having a reflecting surface of an elliptical shape having rotational symmetry about the optical axis L1, and an explosion-proof glass plate installed in the opening of the elliptic reflecting mirror. A projection lamp 4 configured to hermetically seal a lamp tube, a transmissive light valve 10 that modulates the emitted light, and an illumination light from the projection lamp 4 for optimally irradiating the light valve 10. It comprises a rod integrator lens 20, a relay lens 21, a field lens 22, and a projection lens 11 for enlarging and projecting the modulated light modulated by the light valve 10 onto a screen (not shown).

Here, the short arc type metal halide lamp tube 1 has an extremely high internal pressure of several tens of atmosphere in the arc tube during lighting, and it may rupture during lighting. At this time, fragments of the ruptured lamp tube are surrounded. As disclosed in Japanese Patent Application Laid-Open No. 8-7841 so as not to scatter, an explosion-proof glass 3 is provided in the opening of the reflecting mirror so that the fragments are not exposed to the outside.

Further, since the life of such a lamp is usually several thousand hours and it is necessary to replace it, the above-mentioned projection lamp 4 is assembled in the lamp housing 71 so that the user can replace it. It is the lamp unit 70, and the user can use the exterior case 1 of the projection display device.
Open the lid 101 installed on the
0 can be exchanged.

[0007]

However, the metal halide lamp tube 1 during lighting is in a high temperature state of several hundreds of degrees, and the outer surface 2a of the reflecting mirror and the explosion-proof glass surface 3a of the opening of the reflecting mirror are also cooled by a cooling fan. Even if the above is performed, the temperature is still high at around 200 ° C.

Therefore, when the user opens the lid 101 of the outer case 100 and takes out the lamp unit 70 immediately after turning off the lamp in order to replace the lamp, the exposed outer surface 2a of the reflecting mirror 2 at high temperature or There is a risk of accidentally touching the explosion-proof glass surface 3a or the like in the opening of the reflecting mirror and causing an accident such as a burn. In order to prevent such an accident, the exterior case 100 or the lid 101 of the projection type display device is normally provided with a warning display or the like. However, when the temperature of the lamp unit 70 inside the device is sufficiently lowered by the user. It was difficult to judge whether or not there was an accident, and it was difficult to completely prevent the accident.

[0009]

In order to solve the above-mentioned problems, the present invention provides a light source, a projection lamp composed of an elliptical reflecting mirror having a reflection surface of an elliptical surface, and at least the projection lamp as a whole. A lamp housing for covering, a light valve for modulating the light emitted from the projection lamp, and a projection means for projecting the light modulated by the light valve onto a screen are provided, and the emission center of the projection lamp is the elliptical reflecting mirror. In the projection display device arranged near the first focal point, the lamp housing has an opening for projecting light, which is installed near the second focal point of the elliptical reflecting mirror, on which light emitted from the projection lamp is condensed. Including, there is no opening that can directly touch the projection lamp from the outside,
Further, when the projection lamp is replaced, it can be taken out of the apparatus together with the lamp housing.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS.
A mode of the present invention will be described.

FIG. 1 is a schematic view showing the structure of a projection type display device D1 according to the present invention.

As shown in FIG. 1, the projection type display device D1
Is a projection lamp 4 composed of a lamp tube 1, an elliptical reflecting mirror 2 having a reflecting surface having an elliptical shape with rotational symmetry about the optical axis L1, and an explosion-proof glass plate 3 installed in an opening of the elliptic reflecting mirror. And rod integrator lens 2
0, a relay lens 21, a field lens 22, a transmissive light valve 10 that modulates the emitted light, and a projection lens 11 that magnifies and projects the modulated light modulated by the light valve 10 onto a screen (not shown). Has been done.

FIG. 2 is a sectional view showing the outline of the elliptical reflecting mirror 2 in the projection lamp 4 of D1.

Reference numeral 2a denotes an ellipsoidal shape which serves as a reflecting surface of the elliptical reflecting mirror 2, F1 denotes a first focal point of the elliptical surface 2a, and F2 denotes a second focal point.

The emission center of the lamp tube 1 is arranged in the vicinity of the first focal point F1 of the elliptical reflecting mirror 2, and the luminous flux emitted from the lamp tube 1 is reflected by the elliptic reflecting mirror 2 and the second of the elliptical reflecting mirror 2 is reflected. Focus on the focal point F2. Further, the rod integrator 20 has an entrance end face 20a whose elliptic reflection mirror 2 described above.
The second focus F2 is located near the second focus F2.

The rod integrator 20 is a columnar optical element having a quadrangular prism shape. The rod integrator 20 is made of a transparent glass or a resin material, and has an incident end surface 2
The side surfaces other than 0a and the emitting end surface 20b are total reflection surfaces.

Incident end face 20 of rod integrator 20
The light flux incident from a is totally reflected by the side surface that is the total reflection surface,
Alternatively, the light reaches the emitting end face 20b and is emitted without being reflected on the side surface. The light source light from the projection lamp 4 is emitted from the emission end face 2
The emitted light is emitted from the 0b plane as a uniform emitted light having a cross section similar to the emission end face shape.

The relay lens 21 focuses the light emitted from the rod integrator 20 on the light valve 10, which is the surface to be illuminated.

The field lens 22 is the relay lens 21.
The light emitted from is converted into parallel light and is incident on the light valve 10.

The light emitted from the field lens 22 enters the light valve 10, is modulated into a video signal, and is enlarged and projected by a projection lens 11 onto a screen (not shown).

FIG. 3 is a schematic view showing the mounting structure of the projection lamp 4 in the present invention.

The lamp housing 30 is composed of a mounting member 31 for holding the projection lamp 4 and heat insulating covers 32 and 33 for preventing the projection lamp 4 from touching, and has a shape that entirely covers the projection lamp 4. Lamp housing 30
Has an opening 32a for the emitted light installed near the second focal point of the elliptical reflecting mirror, and the emitted light L1 from the projection lamp 4 is
Reference numeral 1 denotes an elliptic reflecting mirror 2 which serves as a second focal point F of the elliptic reflecting mirror 2.
Since the light is focused on 2, the opening 30a of the emitted light of the lamp housing 30 is provided in the vicinity of the second focal point F2 of the elliptical reflecting mirror 2.
By installing the above, the size of the opening 32a can be set to a size in which the projection lamp 4 cannot be directly touched with a hand. As a result, the projection lamp 4 held in the lamp housing 30 cannot be directly touched by the outside from the outside.

The lamp housing 30 can be taken out by opening the lid 101 installed in the outer case 100 of the projection type display device.

The lamp housing may be made of a material having low thermal conductivity.

In order to cool the projection type lamp 4,
It is also possible to form a cooling opening having a size that makes it impossible to directly touch the projection lamp 4 with a hand.

Further, the optical path direction of the light emitted from the projection lamp 4 is changed in the lamp housing. A total reflection mirror or a filter for removing UV and IR components may be installed.

The present invention may be used in a projection type display device using a plurality of light valves. Furthermore, the light valve to be transferred is not limited to the transmissive type, and a reflective type light valve may be used.

The present invention is not limited to the front projection type display device, but may be used for the rear projection type display device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(Embodiment 1) FIG. 1 is a schematic view showing a structure of a projection type display device D1 according to the present invention, and FIG. 2 is a sectional view showing an outline of an elliptical reflecting mirror 2 in a projection lamp 4 of D1.
FIG. 3 is a schematic view showing the mounting structure of the projection lamp 4 of D1.

The light emission center of the lamp tube 1 is arranged in the vicinity of the first focal point F1 of the elliptical reflecting mirror 2, and the light beam L10 emitted from the lamp tube 1 is reflected by the elliptic reflecting mirror 2 to form a light beam L11. The light is focused on the second second focal point F2.
The light beam L11 emitted from the projection lamp 4 is incident from the incident end surface 20a of the rod integrator 20, which is arranged such that the incident end surface 20a thereof is located in the vicinity of the second focus F2 of the elliptic reflecting mirror 2 and is totally reflected. The light reaches the emitting end face 20b and is emitted without being totally reflected by the side surface which is a surface or reflected by the side surface. At this time, the emission end face 20b is uniformly illuminated in the plane and is emitted as emission light L12 having a cross section similar to the emission end face shape.

The emitted light L12 is a light source image on the emitting end face 20b of the rod integrator 20.
The light passes through the relay lens 21 arranged to form an image at (L13) and subsequently enters the field lens 22.
The projection light from the projection lamp is converted into a parallel light beam L14 by the field lens 22, and the light integrator 20 irradiates the light valve 10 uniformly without waste according to the shape of the display surface of the light valve.
Light from the light source that has passed through the light valve 10 is modulated into a video signal and is projected by a projection lens 11 onto a screen (not shown).
Is enlarged and projected (L15).

Next, the mounting structure of the projection lamp 4 in this embodiment will be described with reference to FIG.

In FIG. 3, the projection lamp 4 is a lamp tube 1.
The reflection surface is composed of an elliptical reflecting mirror 2 having an elliptical surface shape having the optical axis L1 as rotational symmetry, and an explosion-proof glass plate 3 installed in the opening of the reflecting mirror, which is positioned and mounted on the lamp mounting member 31. . The lamp mounting member 31 holds and fixes the projection lamp 4 at a predetermined position with respect to the illumination optical system.

Furthermore, heat insulating covers 32 and 33 having a shape that entirely covers the projection lamp 4 are provided, and an opening 32a for emitted light is formed in the vicinity of the second focal point F2 of the elliptical reflecting mirror 2 to form a heat insulating member. 32 and 33 are fixed to the lamp mounting member 31, respectively, to form the lamp housing 30.

The emitted light L11 from the projection lamp 4 is condensed by the elliptical reflecting mirror 2 at the second focal point F2 of the elliptic reflecting mirror 2, so that the opening 3 of the outgoing light formed on the heat insulating cover 32 is formed.
By arranging 2a in the vicinity of the second focal point F2 of the elliptical reflecting mirror 2, the aperture shape of the projection light is made small, and the projection lamp 4
Is an opening of a size that cannot be touched directly by hand.

As a result, the projection lamp 4 held in the lamp housing 30 has the heat insulating covers 32 and 3 attached thereto.
3. Due to the mounting member 31, it cannot be touched directly from the outside.

The lamp housing 30 can be taken out by opening the lid 101 installed on the outer case 100 of the projection type display device for replacing the lamp.

In this embodiment, even if the user takes out the lamp housing 40 immediately after the lamp is turned off to replace the lamp, the user cannot directly touch the projection lamp 4 which is in a high temperature state. It is possible to prevent accidents such as burns without accidentally touching.

(Embodiment 2) FIG. 3 is a schematic view showing a mounting structure of the projection lamp 4 of the projection type display device according to the present invention.

Since the structure of this embodiment other than the mounting structure of the projection lamp 4 is the same as that of the first embodiment, the description other than the mounting structure of the projection lamp is omitted.

In this embodiment, the projection lamp 4 is positioned and mounted on the lamp mounting member 41. The lamp mounting member 41 holds and fixes the projection lamp 4 at a predetermined position with respect to the illumination optical system.

Further, the elliptical reflecting mirror 2 is attached to the heat insulating member 42.
The opening 42a of the emitted light installed near the second focal point F2 of
Is formed and combined with the lamp mounting member 41 to form a shape that entirely covers the projection lamp 4,
The lamp housing 40 is configured.

The emitted light L11 from the projection lamp 4 is condensed by the elliptical reflecting mirror 2 at the second focal point F2 of the elliptic reflecting mirror 2, so that the opening 4 of the outgoing light formed on the heat insulating cover 42 is formed.
By arranging 2a in the vicinity of the second focal point F2 of the elliptical reflecting mirror 2, the aperture shape of the projection light is made small, and the projection lamp 4
Is an opening of a size that cannot be touched directly by hand.

In the present embodiment, accidents such as burns can be prevented as in the case of the first embodiment, and the mounting member 41 has a part of a heat insulating cover for preventing the projection lamp 4 from touching.
It is possible to simplify the structure of the lamp housing 40.

(Embodiment 3) FIG. 4 is a sectional view showing a mounting structure of the projection lamp 4 of the projection type display device according to the present invention.

Since the structure of this embodiment other than the mounting structure of the projection lamp 4 is the same as that of the first embodiment, the description other than the mounting structure of the projection lamp is omitted.

In this embodiment, the projection lamp 4 is positioned and mounted on the lamp mounting member 51. The lamp mounting member 51 holds and fixes the projection lamp 4 at a predetermined position with respect to the illumination optical system.

Further, the elliptical reflecting mirror 2 is attached to the heat insulating member 52.
52a of the emitted light installed near the second focal point F2 of
Is formed and combined with the lamp mounting member 51 to form a shape that entirely covers the projection lamp 4,
The lamp housing 50 is configured.

The light L11 emitted from the projection lamp 4 is condensed by the elliptical reflecting mirror 2 at the second focal point F2 of the elliptic reflecting mirror 2, so that the opening 52 of the light emitted from the lamp housing 50 is formed.
By disposing a in the vicinity of the second focal point F2 of the elliptical reflecting mirror 2, the opening of the projection light is made small, and the projection lamp has an opening of a size that cannot be touched directly by hand.

Further, in order to cool the projection lamp 4, the lamp mounting member 51 and the heat insulating cover 52 are provided with a cooling opening 5 of such a size that the projection lamp 4 cannot be touched directly by hand.
1b and 52b were installed respectively. The cooling openings 51b and 52b may be formed by separate members.

In this embodiment, accidents such as burns can be prevented as in the first and second embodiments, and the projection housing 4 can be prevented from overheating by forming an opening for cooling the projection lamp 4 in the lamp housing 50. It becomes possible and the projection lamp 4
It is possible to prevent performance deterioration due to overheating.

(Embodiment 4) FIG. 6 is a sectional view showing a mounting structure of the projection lamp 4 of the projection type display apparatus according to the present invention.

Since the structure of this embodiment other than the mounting structure of the projection lamp 4 is the same as that of the first embodiment, the description other than the mounting structure of the projection lamp is omitted.

In this embodiment, the projection lamp 4 is positioned and mounted on the lamp mounting member 61 as in the first, second and third embodiments. The lamp mounting member 61 fixes the projection lamp 4 at a predetermined position with respect to the illumination optical system.

The lamp mounting member 61 is provided with a total reflection mirror 63 for changing the optical path direction of the emitted light L11 from the projection lamp 4, and the emitted light L11 is directed by the total reflection mirror 63 into a light flux direction to the L11a direction. Will be changed.

Further, the elliptical reflecting mirror 2 is attached to the heat insulating member 62.
The opening 62a of the emitted light installed near the second focal point F2 of the
Is formed and combined with the lamp mounting member 61 to form a shape that entirely covers the projection lamp 4,
The lamp housing 60 is configured.

The light L11 emitted from the projection lamp 4 is condensed by the elliptical reflecting mirror 2 at the second focal point F2 of the elliptic reflecting mirror 2, so that the opening 62 of the light emitted from the lamp housing 60 is formed.
By disposing a in the vicinity of the second focal point F2 of the elliptical reflecting mirror 2, the opening of the projection light is made small, and the projection lamp 4 has an opening of a size that cannot be touched directly by hand.

The total reflection mirror 63 for changing the optical path direction of the projected light may be attached to another member other than the lamp attachment member 61 and installed in the lamp housing 60 to form the lamp housing 60.

In this embodiment, accidents such as burns can be prevented and the lamp housing 60 can be used as in the first, second and third embodiments.
By installing the total reflection mirror 63 that changes the optical path direction inside, the illumination optical system can be downsized. Further, since the projection lamp 4 and the total reflection mirror 63 are attached to the same member, the accuracy of parts can be improved.

[0061]

As described above, according to the present invention,
The emitted light L11 from the projection lamp 4 is condensed by the elliptical reflecting mirror 2 at the second focal point F2 of the elliptic reflecting mirror, so that the opening of the outgoing light of the lamp housing is close to the second focal point F2 of the elliptic reflecting mirror 2. By arranging the projection lamp 4 in a small area, the opening of the projection light is made small, and the projection lamp 4 has an opening of a size that cannot be directly touched by a hand. As a result, even if the user takes out the lamp housing immediately after turning off the lamp, it is possible to prevent accidents such as burns without accidentally touching the high-temperature projection lamp.

[Brief description of drawings]

FIG. 1 is a schematic view showing a structure of a projection type display device in Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view showing an outline of an elliptical reflecting mirror in the projection lamp of the projection type display device in Embodiment 1 of the present invention.

FIG. 3 is a schematic view showing a mounting structure of a projection lamp of the projection type display device in Embodiment 1 of the present invention.

FIG. 4 is a schematic view showing a mounting structure of a projection lamp of the projection type display device in Embodiment 2 of the present invention.

FIG. 5 is a schematic diagram showing a mounting structure of a projection lamp of a projection type display device in Embodiment 3 of the present invention.

FIG. 6 is a schematic view showing a mounting structure of a projection lamp of the projection type display device in Embodiment 4 of the present invention.

FIG. 7 is a schematic view showing a structure of a conventional projection display device.

FIG. 8 is a schematic view showing a mounting structure of a projection lamp of a conventional projection type display device.

[Explanation of symbols]

1 lamp tube 2 elliptical reflector 2a elliptical surface 3 explosion-proof glass 4 Projection lamp 10 Light valve 11 Projection lens 20 Rod integrator 20a Incident surface of rod integrator 20b Output surface of rod integrator 21 relay lens 22 field lens 30 lamp housing 31 Mounting member 32 heat shield 32a opening 33 Heat shield 40 lamp housing 41 Mounting member 42 Heat shield 42a opening 50 lamp housing 51 Mounting member 51b Cooling opening 52 Thermal cover 52b Cooling opening 60 lamp housing 61 Mounting member 62 heat shield 62a opening 63 Total reflection mirror 70 lamp unit 100 outer case 101 lid L1 optical axis L10 luminous flux L11 luminous flux L11a luminous flux L12 luminous flux L13 luminous flux L14 luminous flux L15 Projection light D1 Projection display device according to the present invention D2 Conventional projection type display device F1 Elliptic mirror 2 first focus F2 Second focus of elliptical reflecting mirror 2

Claims (2)

[Claims] 1. A light source, a projection lamp composed of an elliptical reflecting mirror whose reflection surface is an elliptical surface, a lamp housing covering at least the entire surface of the projection lamp, and light emitted from the projection lamp. A projection type display device comprising a light valve and a projection means for projecting light modulated by the light valve onto a screen, wherein the emission center of the projection lamp is arranged near the first focal point of the elliptical reflecting mirror. The housing includes an opening for projection light, which is installed near the second focal point of the elliptical reflecting mirror, on which the light emitted from the projection lamp is condensed, and the projection lamp can be directly touched from the outside by hand. The projection type display device has no opening and can be taken out of the apparatus together with the lamp housing when the projection lamp is replaced. . 2. The lamp housing is composed of a plurality of parts, and at least one of the plurality of parts comprises:
The projection display device according to claim 1, wherein the projection lamp is held and fixed.