JP2001356404A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate such a trouble that a prism surface is burnt or broken due to the heat of condensed light in the case of enhancing light intensity by using many light emitting bodies. SOLUTION: This device is equipped with light emitting means 3a and 3b emitting parallel beams and a light condensing device 4 provided with a parabolic light condensing mirror 4x reflecting the parallel beams emitted from the light source means 3a and 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display apparatus which applies image information to light emitted from a plurality of light source means, receives the light, and displays an image based on the image information on a display means. It is related.

[0002]

2. Description of the Related Art FIG. 13 is a diagram showing an optical system configuration of a conventional image display device disclosed in Japanese Patent Application Laid-Open No. 6-242397. In FIG. 13, reference numerals 31a and 31b denote light emitters that emit light, respectively, and reference numerals 32a and 32b denote light emitters 31a and 31 respectively.
A condenser 34 for condensing the light emitted by b, and a prism 34 for bending the optical path of the light from the condensers 32a and 32b.

Reference numeral 36 denotes a relay lens that receives and irradiates light from the prism 34, 37 denotes a light valve that receives irradiation light from the relay lens 36, and spatially modulates the intensity of the light based on image information. A projection optical system 39 projects the light whose intensity is modulated by the light valve 37, and a screen 39 receives the projection light from the projection optical system 38 and displays an image.

Next, the operation will be described. Luminous body 31
The light emitted from the light sources a and 31b is condensed on the tip of the prism 34 by the light collectors 32a and 32b, respectively. The prism 34 folds this light to a relay lens 36, and the relay lens 36 irradiates the light to a light valve 37. The light valve 37 spatially modulates the light based on the image information, and projects the light on a screen 39 via a projection optical system 38. On the screen 39, an image based on the image information is displayed.

The light condensing points of the condensers 32a and 32b are set near the tip of the prism 34 and near the object point of the relay lens 36, so that the light passing through the prism 34 and the relay lens 36 Overlap and light valve 37
And the light intensity obtained by adding the light intensities of the two light emitters 31a and 31b is obtained. The reason for increasing the light intensity is that the contrast and brightness of the image displayed on the screen 39 can be improved. Also, when the screen 39 is made large, light is projected onto the screen 39 at a wider angle, so that it is necessary to increase the light intensity.

[0006]

Since the conventional image display device is configured as described above, if an attempt is made to increase the light intensity by using a large number of light emitters, the prism surface is burned or damaged due to the heat of condensing. There has been a problem that a problem occurs.

[0007] Due to these burns and damages, the conventional image display device can use at most only two light emitters, and it is difficult to further increase the light intensity.
Therefore, there has been a limit in improving the brightness and contrast of the screen and increasing the size of the screen.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to increase the light intensity by using a large number of light emitters without causing burning or breakage of the prism surface due to heat of condensing. It is an object of the present invention to configure an image display device capable of performing the above.

[0009]

The image display apparatus according to the present invention comprises a light source means for emitting parallel light having a plane having the same phase plane, and a light-collecting surface mirror for reflecting the parallel light and condensing the light at a focal point. And a light receiving and irradiating means for receiving the parallel light condensed at the focal point and irradiating the image information providing means with irradiation light.

In the image display apparatus according to the present invention, the parabolic condensing mirror formed by rotating the parabola around the axis of rotation perpendicular to the parabola and passing through the focal point is formed by a condensing means. It is intended to have.

The image display apparatus according to the present invention is such that the light-collecting means includes a light-collecting surface mirror formed in a spherical shape, and diffractive optical means for correcting aberration caused by the light-collecting surface mirror. .

In the image display apparatus according to the present invention, the parabolic condensing mirror formed by rotating the parabola around the rotation axis passing through the focus parallel to the parabola quasi-line is formed by a condensing means. The light condensing means has a conical mirror that has a vertex formed on the display means side with the rotation axis as the optical axis, receives parallel light emitted from the light source means from the bottom side, and reflects the light to the light collecting plane mirror. It was made.

In the image display apparatus according to the present invention, a parabolic converging surface mirror formed by rotating a parabola around a rotation axis passing through a focal point parallel to a parabola of the parabola is formed by a converging means. The light collecting means has a conical mirror that has a bottom surface formed on the display means side with the rotation axis as the optical axis and receives parallel light emitted from the light source means from the bottom side and reflects the light to the light collecting surface mirror. It was made.

The image display device according to the present invention is such that a Fresnel mirror in which the shape of a light-collecting surface mirror divided into a plurality of small areas is formed is used as light-collecting means.

In the image display apparatus according to the present invention, the light receiving and irradiating means includes a rod integrator having an incident surface provided at a focal point of a light-collecting surface mirror.

An image display device according to the present invention comprises a parabolic mirror formed by rotating a parabola about a rotation axis perpendicular to a parabola and passing through a focal point, and a parabolic mirror installed at the focal point of the parabolic mirror. The light source means is provided with a light emitter that emits light.

An image display device according to the present invention includes an ellipsoidal mirror formed by rotating an ellipse around a rotation axis passing through one focal point and the other focal point of an ellipse; The light source means includes a light emitting body that emits light, a diffusion plate provided with a small opening provided at the other focal point, and an aspheric lens that emits light emitted from the small opening as parallel light. is there.

In the image display device according to the present invention, the diffusion plate has a scattering surface for scattering the light emitted from the light emitter on the surface on the light emitter side, and the diffusion plate has a plurality of spherical lenses arranged on the scattering surface. It is like that.

An image display device according to the present invention includes a luminous body that emits light, a plurality of aspherical lenses provided so as to surround the luminous body, and emits light emitted by the luminous body as parallel light, and an aspherical lens. And a plurality of plane mirrors for reflecting parallel light from the light source to the light condensing means.

In the image display device according to the present invention, a light emitting diode which emits parallel light is used as a light source.

In the image display device according to the present invention, a plurality of light source means are arranged according to the light distribution characteristics of the display means.

The image display device according to the present invention is such that the light source means has auxiliary light sources having different light distribution characteristics.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a diagram showing an optical system configuration of an image display device according to Embodiment 1 of the present invention. In the following figures, the optical paths are indicated by arrows. In FIG. 1, reference numerals 1a and 1b denote light emitters each emitting light, 2a and 2b denote parabolic mirrors each having a parabolic shape, and 3a denotes light source means composed of a light emitter 1a and a parabolic mirror 2a. Is a light source means composed of a luminous body 1b and a parabolic mirror 2b;
A light collector (light collecting means) 5 having x is a cylindrical rod integrator (light receiving and irradiating means).

Reference numeral 6 denotes a relay lens (light receiving and irradiating means) for receiving and irradiating light from the rod integrator 5, and 7 receives irradiating light from the relay lens 6 and spatially irradiates the irradiating light based on image information. A light valve (image information providing means) for modulating, 8 is a projection optical system (display means) for projecting light to which image information is given by the light valve 7, and 9 is a device for receiving projection light from the projection optical system 8 and receiving an image. (Display means). The relay lens 6, the light valve 7, the projection optical system 8 and the screen 9 have the same configuration as the conventional one.

The parabolic mirrors 2a and 2b are respectively formed by rotating the parabola with a rotation axis (that is, an optical axis) being a straight line perpendicular to the quasi-line of the two-dimensional parabola and passing through the focal point.
The luminous bodies 1a and 1b are installed at the focal points of the parabolic mirrors 2a and 2b, respectively. Ultra high-pressure mercury lamps (UHP) with good luminous efficiency and short arc length are used as the luminous bodies 1a and 1b.
Is used.

Like the parabolic mirrors 2a and 2b, the focusing mirror 4x of the collector 4 also rotates the parabola about an axis of rotation (optical axis) perpendicular to the parabola and passing through its focal point. It is a parabolic surface formed as follows. The optical axes of the parabolic mirrors 2a and 2b are both parallel to the optical axis of the condenser mirror 4x and intersect with the condenser mirror 4x.

At the focal point of the condenser mirror 4x, an incident surface of the rod integrator 5 is provided. The optical axis of the cylindrical rod integrator 5 is perpendicular to the light receiving surface of the screen 9. A part of the light-collecting surface mirror 4x of the light collector 4 is appropriately cut so that the rod integrator 5 can be installed. FIG. 1 shows a cross section of the light collector 4.

Next, the operation will be described. Generally, when light emitted from the focal point of the paraboloid is reflected by the paraboloid, the light is emitted as parallel light (light wave having a plane having the same phase plane).
In the first embodiment, since the luminous bodies 1a and 1b are respectively installed at the focal points of the parabolic mirrors 2a and 2b, the light emitted from the luminous bodies 1a and 1b is transmitted to the parabolic mirrors 2a and 2b. Are reflected by the light source means 3a,
3b.

In practice, the luminous bodies 1a and 1b having a certain physical size cannot be regarded as point light sources that completely coincide with the focal point, but the light from the light source means 3a and 3b is almost parallel light. Can be considered. Regarding the light source means for emitting parallel light with higher parallelism, the seventh embodiment will be described.
It will be described in 8.

The light-collecting surface mirror 4x of the light collector 4 is also a paraboloid,
Parallel light is incident on the converging surface mirror 4x from the light source means 3a, 3b. Because the parallel light is reflected by the paraboloid due to the regression of the light, it is condensed at the focal point.
The parallel light from 3b is reflected by the light-collecting surface mirror 4x and condensed at the focal point of the light-collecting surface mirror 4x. Light source means 3a, 3
Since the parallel light is uniformly incident from b, the light from the condenser mirror 4x does not burn.

In particular, since parallel light only needs to be incident on the light-collecting surface mirror 4x from the light source means, the light source means is not restricted with respect to other arrangement conditions, the number, and the optical characteristics. The degree of freedom is increased.

At the focal point of the condenser mirror 4x, an incident surface of the rod integrator 5 is provided. Light source means 3a, 3b
According to the degree of parallelism of the parallel light from the lens, this incident surface has an appropriate aperture area, so that the rod integrator 5 receives all the light condensed at the focal point by the converging surface mirror 4x from the incident surface. can do. Since the rod integrator 5 does not cause burning or breakage due to light collection, unlike the conventional case, light from a large number of light emitters can be collected to obtain high-intensity light.

The light incident on the rod integrator 5 is
The light is reflected on the side surface of the rod integrator 5 a plurality of times and reaches the emission surface of the rod integrator 5. The length of the rod integrator 5 in the direction of the optical axis is determined so that the light intensity on the emission surface has a desired distribution. For example, the length is determined according to the specification of the light distribution on the screen 9 such as to obtain a uniform light intensity on the emission surface or to increase the light intensity at the periphery of the emission surface.

Hereinafter, the light emitted from the rod integrator 5 by the same operation as in the prior art
The image is projected on the screen 9 via the light valve 7 and the projection optical system 8, respectively, and an image is displayed.

FIG. 2 is a view showing a light quantity distribution (solid line) at a light condensing position (focal point) when two parallel laser lights are incident on the light collector 4. The horizontal axis represents the positional deviation of the light meter from the light condensing position, and the vertical axis represents the light intensity (normalized by the maximum measured value) measured by the light meter. FIG. 2 also shows the measurement results in the case of one laser beam (broken line) and the other laser beam (dashed line). The two parallel laser beams are used as parallel beams of the light source means 3a and 3b.

As a result of adding the intensity of one laser beam and the intensity of the other laser beam, the light quantity distribution characteristics (solid line) of two parallel laser beams are obtained. FIG. 2 shows that the light intensity at the light condensing position can be increased in accordance with the number of light source means. In the first embodiment, even if the number of light source means is increased, burning or damage due to light collection does not occur, so that the light intensity on the screen 9 can be increased.

As described above, according to the first embodiment, the light source means 3a, 3b for emitting parallel light and the parabolic condensing light for reflecting the parallel light emitted from the light source means 3a, 3b. With the light collector 4 provided with the plane mirror 4x, a plurality of light source means are arranged without being restricted by the number, arrangement and optical characteristics of the light source means.
The parallel light can be condensed at the focal point by the converging surface mirror 4x, and the effect of increasing the degree of freedom in designing the image display device can be obtained.

Further, since the condenser 4 is composed of a single reflecting mirror, the effect of reducing the light attenuation in the condenser can be obtained as compared with the condenser lens composed of the refractive lens. Can be

Furthermore, according to the first embodiment, the light source is composed of the parabolic mirrors 2a and 2b and the luminous bodies 1a and 1b that emit light at the focal points of the parabolic mirrors 2a and 2b. Since the means 3a and 3b are respectively configured, an effect that parallel light can be generated with a simple configuration can be obtained.

Further, according to the first embodiment, since the rod integrator 5 having the incident surface provided at the focal point of the light-collecting surface mirror 4x of the light collector 4 is provided, burning or breakage is caused. Thus, it is possible to receive the condensed light without increasing the number of light source means, thereby increasing the light intensity with respect to the screen 9.

In the first embodiment, the case has been described where the light-collecting surface mirror 4x of the light collector 4 has a parabolic shape. And a diffractive optical system (diffraction means) for converging parallel light and correcting an aberration component of light generated by the converging surface mirror, and the same effect can be obtained.

Embodiment 2 FIG. 3 is a diagram showing an optical system configuration of an image display device according to Embodiment 2 of the present invention.
Components that are the same as or correspond to those in the first embodiment are denoted by the same reference numerals. In FIG. 3, reference numeral 10 denotes a conical mirror 10x having a conical surface and a parabolic mirror 10y having a parabolic shape.
(Light collecting surface mirror). FIG. 3 shows a cross section of the light collector 10.

The parabolic mirror 10y is formed by rotating a parabola with a rotation axis (optical axis) being a straight line parallel to a parabola of the parabola and passing through its focal point. However, unnecessary portions of the parabolic mirror 10y are appropriately cut out so that the incident surface of the rod integrator 5 can be set at the focal point of the parabolic mirror 10y. The optical axis of the rod integrator 5 is a parabolic mirror 10
It is coincident with the optical axis of y.

The optical axis of the conical mirror 10x also coincides with the optical axis of the parabolic mirror 10y, and the vertex side of the conical mirror 10x faces the screen 9. However, the portion from the predetermined inner diameter to the apex of the conical mirror 10x is appropriately cut off to have a truncated cone shape. The light source means 3a, 3b is installed on the bottom side of the conical mirror 10x, and the parabolic mirrors 2a, 2b
Is perpendicular to the bottom surface. Light source means 3a, 3b
Is incident on the condenser 10 from this bottom surface.

Next, the operation will be described. Embodiment 1
The parallel light emitted from the light source means 3a, 3b by the same operation as described above is reflected by the conical mirror 10x of the condenser 10. Since the conical mirror 10x has no curvature in a plane including the optical path of the light, the parallel light reflected by the conical mirror 10x enters the parabolic mirror 10y while maintaining the parallelism, similarly to the reflection by the plane mirror. I do. Parabolic mirror 1
0y reflects the incident parallel light and condenses it at the focal point of the parabolic mirror 10y. The light incident surface of the rod integrator 5 is located at this focal point, the collected light is received by the rod integrator 5, and an image is displayed on the screen 9 by the same operation as in the first embodiment.

The concentrator 10 includes a conical mirror 10x and a parabolic mirror 1
Since the optical axis is symmetric with respect to the optical axis of 0y, the above description holds for an arbitrary plane including the optical axis, and all the light from the light source means disposed around the optical axis is focused on the focal point of the parabolic mirror 10y. Become like As in the first embodiment, there are no restrictions on the number, arrangement, and optical characteristics of the light source means, and parallel light may be incident on the light collector. Can be higher.

FIG. 4 shows two parallel laser beams which are collected by the condenser 10.
FIG. 4 is a diagram showing a light amount distribution (solid line) at a light condensing position (focal point) when light is incident on the light source. The horizontal axis represents the position deviation of the light meter from the light condensing position, and the vertical axis represents the light intensity measured by the light meter (normalized by the maximum measured value). FIG. 4 also shows measurement results in the case of one laser beam (dashed line) and the other laser beam (dashed line). The two parallel laser beams are emitted from the light source means 3a,
3b is used as parallel light.

As in the first embodiment, as a result of adding the intensity of one laser beam and the intensity of the other laser beam,
The light amount distribution characteristics (solid line) of two parallel laser beams are obtained. As described above, it can be seen that the light intensity at the light condensing position can be increased according to the number of the light source means, and the desired light intensity can be obtained by increasing the number of the light source means without causing burning or damage.

As described above, according to the second embodiment, the parabolic mirror 10y having the optical axis as a straight line passing through the focus parallel to the parabola quasi-line, and the parabolic mirror 10y and the optical axis An apex is formed on the screen 9 side so as to coincide with the conical mirror 10x having a conical mirror 10x for receiving parallel light from the light source means 3a, 3b arranged around the optical axis from the bottom side. As a result, parallel light can be focused at a focal point, and a plurality of light source means can be arranged without being restricted in terms of the number, arrangement, and optical characteristics, and the degree of freedom in designing an image display device is increased. Can be increased.

Embodiment 3 FIG. 5 is a diagram showing an optical system configuration of an image display device according to Embodiment 3 of the present invention.
The same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and the components after the rod integrator 5 are not shown. In FIG.
Reference numeral 11 denotes a light collector (light collecting means) composed of a conical mirror 11x having a conical surface shape and a parabolic mirror 11y (light collecting surface mirror) having a parabolic shape. FIG. 5 shows a cross section of the light collector 11.

The difference between the light collector 11 of the third embodiment and the light collector 10 of the second embodiment is that the bottom surface of the conical mirror 11x is directed toward the screen 9. Other configuration conditions are the same as in the second embodiment. By configuring such a concentrator 11, the concentrator 11
The light source means 3a, 3b can be arranged between the bottom surface of the screen and the screen 9, so that the same effect as in the second embodiment can be obtained, and the thickness of the image display device can be reduced by effectively utilizing the dead space. The effect that it can be obtained is obtained.

Embodiment 4 FIG. FIG. 6 is a diagram showing an optical system configuration of an image display device according to Embodiment 4 of the present invention.
The same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and the configuration beyond the rod integrator 5 is not shown. In FIG. 6, reference numeral 12 denotes a Fresnel mirror (light collecting means, light collecting surface mirror) which collects parallel light from the light source means 3a, 3b to the rod integrator 5.

FIG. 7 is an enlarged view of a cross section of the Fresnel mirror 12. As shown in FIG. 7, the light-collecting surface mirror 4x of the light collector 4 shown in the first embodiment is divided into a plurality of small regions in the parallel light incident direction, and the light-collecting surface mirror 4x of each small region is divided. The Fresnel mirror 12 is formed by forming the divided surfaces 12a to 12f having a shape into a plane mirror.

Fresnel mirror 1 having such a shape
2 has a light-condensing effect substantially equivalent to that of the light-collecting device 4, so that the same effect as in the first embodiment can be obtained, and the light-collecting device 2 can be easily manufactured from a single plane mirror by performing lathing or the like. The effect that the manufacturing cost can be reduced is obtained.

The converging surface mirror 4 described in the first embodiment
The fresnel mirror can be applied also when x is a spherical shape. In this case, since no aberration occurs in the light reflected by the Fresnel mirror, a diffractive optical system is not required, and the configuration of the optical system is simplified.

Embodiment 5 In the fifth embodiment, a method for arranging the light source means will be described. FIG. 8 is a diagram showing the relationship between the plurality of light source means 3a to 3i and the light collector 4 in the image display device according to the fifth embodiment of the present invention. The light source means 3 a to 3 i are projected on the light collector 4.

As described in the first embodiment, since there are no restrictions on the conditions for arranging the light sources 3a to 3i with respect to the light collector 4, the light sources 3a to 3i can be arbitrarily arranged. Therefore, as shown in FIG. 8, for example, the light source means 3 emits parallel light to the outer edge of the light collector 4 so as to increase the amount of light corresponding to the outer edge of the light collector 4.
a to 3i can be arranged. By doing so, the light intensity at the outer edge portion where the light intensity is reduced can be increased, and the light distribution to the screen 9 can be optimized.

In the fifth embodiment, the light source means 3
Although the case where a to 3i are used has been described, the number of light source means is not particularly limited.

The fifth embodiment is different from the first embodiment.
Embodiment 2 is not limited to the light collector 4
4 can be applied to each of the concentrators.

Embodiment 6 FIG. In the sixth embodiment, a method of arranging a plurality of types of light source units having different light distribution characteristics will be described. FIG. 9 shows a plurality of light source means 3a to 3g, 13 in an image display apparatus according to Embodiment 6 of the present invention.
It is a figure which shows the relationship between 13a and 13b and the light collector 4. The light source means 3 a to 3 g and the light source means 13
a and 13b are projected.

In the sixth embodiment, the light source means 3a to 3
g and the light sources 13a and 13b emit parallel light to the light collector 4. In particular, the light sources 13a and 13b are used as auxiliary light sources to supplement the light amount of the light source 3a. In the present invention, since there are no restrictions on the arrangement conditions and light distribution characteristics of the light source means, light source means 13a and 13b having light distribution characteristics different from those of the light source means 3a to 3g can be used, and light distribution to the screen 9 is optimized. The effect is obtained.

The case where the light source means 3a to 3g and the light source means 13a and 13b are used has been described.
The number and type of light distribution characteristics of the light source means are not particularly limited.

The sixth embodiment is different from the first embodiment.
Embodiment 2 is not limited to the light collector 4
4 can be applied to each of the concentrators.

Embodiment 7 FIG. FIG. 10 is a diagram showing an optical system configuration of an image display device according to Embodiment 7 of the present invention. The same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and the components after the light collector are not shown. In FIG. 10, reference numeral 14 denotes an ellipsoidal mirror, which is formed by rotating an ellipse with a long axis passing through two focal points of the ellipse as a rotation axis (optical axis). Elliptical mirror 1
The luminous body 1 is provided at one of two focal points of 4.

15 is a plurality of spherical lenses, 16 is a small aperture 1
A diffusing plate having 6z; 17 is an aspherical lens that receives light passing through the small aperture 16z and emits parallel light to a condenser not shown; 18 is a lens holding mechanism that holds the aspherical lens 17 on the diffusing plate 16 It is. Light-emitting body 1, elliptical mirror 14, a plurality of spherical lenses 15, diffusing plate 16, and aspheric lens 1
7, light source means is constituted.

The luminous body 1 is provided at one focal point of the ellipsoidal mirror 14, while the diffusing plate 16 is provided at the other focal point.
Are located. The diffusion plate 16 is installed so as to be orthogonal to the optical axis of the ellipsoidal mirror 14. The surface of the diffusion plate 16 on the side of the light emitter 1 is a scattering surface for scattering light, and a plurality of spherical lenses 15 are densely arranged on this scattering surface.

The luminous body 1 and the spherical lens 15 are spatially surrounded by the elliptical mirror 14 and the diffusing plate 16, and the portion of the elliptical mirror 14 that does not surround the luminous body 1 by dividing the diffusing plate 16 is appropriately. It has been cut off. The surface of the diffusion plate 16 on which the spherical lenses 15 are not arranged is provided with a lens holding mechanism 1.
The aspheric lens 17 is held by 8, and its optical axis coincides with the optical axis of the ellipsoidal mirror 14.

Next, the operation will be described. Generally, light emitted from one focal point of the ellipsoid is reflected by the ellipsoid and collected at the other focal point. Therefore, the light emitted by the luminous body 1 installed at one focal point of the ellipsoidal mirror 14 is
The light is reflected by the ellipsoidal mirror 14 and focused on the small aperture 16z provided at the other focal point.

The light passing through the small aperture 16z irradiates the aspheric lens 17. The aspheric lens 17 is designed to emit the irradiation light as perfect parallel light, and parallel light with higher parallelism is emitted from the aspheric lens 17 as compared with the first embodiment.

Incidentally, since the luminous body 1 has a certain physical size, it cannot be regarded as a point light source which completely coincides with the focal point. Therefore, not all light emitted by the light emitter 1 due to one reflection by the ellipsoidal mirror 14 passes through the small opening 16z, and some light does not pass through the small opening 16z. For this reason, a plurality of spherical lenses 15 are densely arranged on the scattering surface of the diffusion plate
Light that does not pass through z also passes through the small opening 16z.

That is, light that does not pass through the small aperture 16z is condensed by the spherical lens 15 and reaches the scattering surface of the diffusion plate 16, is scattered by the scattering surface of the diffusion plate 16, and passes through the spherical lens 15 again. The light is emitted as substantially parallel light in the direction in which the luminous body 1 is installed.

Light traveling in the direction of the luminous body 1 is reflected by the ellipsoidal mirror 14, and of the reflected light, light passing through one focal point of the ellipsoidal mirror 14 passes through the small aperture 16z. The light is emitted as a parallel light by the aspherical lens 17 to a light collector (not shown). Again a small opening 16
Although there is light that does not pass through z, such light is repeatedly reflected between the scattering surface of the diffusion plate 16 and the elliptical mirror 14 until it passes through the small opening 16z by the same operation as described above.

As described above, the spherical lens 15 and the diffusion plate 16
And the spherical lens 15, the diffusion plate 16, and the elliptical mirror 1
The light passing through the small opening 16z is increased by the reflection with the light source 4, and the utilization efficiency of the light emitted from the light emitter 1 is increased.

By the above operation, the parallel light passing through the aspherical lens 17 is received by the constituent elements after the condenser (not shown), and the same operation as in the first embodiment is performed.

As described above, according to the seventh embodiment, the elliptical mirror 14, the light-emitting body 1 provided at one focal point of the elliptical mirror 14, A diffusion plate 16 having a small opening 16z that forms a space surrounding the luminous body 1 together with the ellipsoidal mirror 14, and a lens holding mechanism 18 on the surface of the diffusion plate 16 where the luminous body 1 does not exist by dividing the diffusion plate 16 The light emitted from the luminous body 1 is reflected by the ellipsoidal mirror 14 and passes through the small opening 16z, so that the light is emitted from the light emitter 1 as parallel light. As a result, the light is emitted as parallel light, and the effect of using light with higher parallelism can be obtained.

According to the seventh embodiment, the diffusion plate 16 has a scattering surface on the light emitting body 1 side, and includes a plurality of spherical lenses 15 densely arranged on the scattering surface. Light that does not pass through the small opening 16z is repeatedly reflected between the scattering surface of the diffusion plate 16 and the ellipsoidal mirror 14 until it passes through the small opening 16z, and the light passing through the small opening 16z increases to emit light. The effect that the utilization efficiency of the light emitted by the body 1 can be increased is obtained.

Embodiment 8 FIG. FIG. 11 is a diagram showing an optical system configuration of an image display device according to Embodiment 8 of the present invention. The same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and the components after the light collector are not shown. In FIG. 11, 19a, 1
Reference numerals 9b, 19c and 19d denote aspheric lenses which convert the light emitted from the light emitter 1 into parallel light.

In the direction in which the light from the luminous body 1 that has passed through the aspherical lens 19a travels (hereinafter, referred to as the screen direction), there is a configuration after the light collector (not shown). Further, the aspheric lens 19d is installed so as to sandwich the luminous body 1 with the aspheric lens 19a, and the light from the luminous body 1 via the aspheric lens 19d travels in a direction opposite to the screen direction.

Further, the aspheric lenses 19b and 19c face each other with the light emitter 1 interposed therebetween, and the light from the light emitter 1 that has passed through the aspheric lenses 19b and 19c is opposite to the light orthogonal to the screen direction. Emits in the direction. Aspheric lenses 19a, 19b, 19c and 19d
Are configured to be in contact with each other and to surround the luminous body 1.

Reference numerals 20b and 20c denote aspherical lenses 1 respectively.
A plane mirror for reflecting light transmitted through 9b and 19c,
0d and 20e are plane mirrors for reflecting light transmitted through the aspheric lens 19d. Light-emitting body 1, aspherical lens 19a
19d and the plane mirrors 20b to 20e constitute light source means.

The plane mirror 20b reflects the light transmitted through the aspherical lens 19b toward the screen, and the plane mirror 20c reflects the light transmitted through the aspherical lens 19c toward the screen. The plane mirror 20d reflects the light from the aspheric lens 19d emitted in the direction opposite to the screen direction in the light emitting direction from the aspheric lens 19b (or the light emitting direction from the aspheric lens 19c). It is installed as follows. The plane mirror 20e is provided so as to reflect the light reflected by the plane mirror 20d in the screen direction.

As described above, the light emitted from the luminous body 1 is determined as parallel light by the aspheric lenses 19a to 19d to determine the emission direction, and the parallel light emitted in a direction different from the screen direction is reflected by the plane mirrors 20b to 20e. Since the light is emitted as parallel light in the screen direction, light with higher parallelism can be used as compared with the first embodiment, and the use efficiency of light emitted from the light emitting body 1 can be increased.

As described above, according to the eighth embodiment, the aspheric lenses 19a to 19d provided so as to surround the light emitter 1 and the aspheric lenses 19b to 19d traveling in a direction different from the screen direction are provided. Plane mirrors 19b to 19b that reflect parallel light transmitted through
19e, it is possible to use the parallel light having higher parallelism and to increase the use efficiency of the light emitted from the light emitter 1.

The number and arrangement of the aspherical lenses are not particularly limited. Generally, a plurality of aspherical lenses may be used to surround the luminous body, and may be adjusted according to the specifications of the image display device. What is necessary is just to determine.

Similarly, the number and positional relationship of the plane mirrors are not particularly limited. If parallel light that passes through the aspherical lens and does not exit in the screen direction travels in the screen direction by an arbitrary number of reflections. What is necessary is just to determine according to the specification etc. of an image display apparatus.

Embodiment 9 FIG. 12 is a diagram showing an optical system configuration of an image display device according to Embodiment 9 of the present invention. The same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and the rod integrator 5
The illustration of the subsequent configuration is omitted. In FIG. 12, reference numerals 21a, 21b, 21c and 21d denote light emitting diodes (light source means) which emit parallel light, respectively.

In the ninth embodiment, the light source means 3a, 3b shown in the first embodiment is replaced with the light emitting diodes 21a to 21a.
The configuration is replaced with d. Due to recent technological advances, high-intensity light-emitting diodes have been realized at low prices. Therefore, a large number of light-emitting diodes 21a to 21d are prepared and used as light source means for emitting parallel light to the light collector 4. Can be used. The operation after the light collector 4 is the same as that in the first embodiment, and the description is omitted.

As described above, according to the ninth embodiment, an inexpensive light emitting diode is used as the light source means, so that the effect of reducing the manufacturing cost of the image display device can be obtained.

[0089]

As described above, according to the present invention, the light source means for emitting parallel light having the same phase plane as a plane, and the condensing mirror having the condensing surface mirror for reflecting the parallel light and condensing it at the focal point are provided. The light source means and the light receiving and irradiating means for receiving the parallel light condensed at the focal point and irradiating the image information providing means with the irradiating light are provided, so that the light source means restricts the number, arrangement and optical characteristics. The parallel light can be focused at the focal point without receiving and without causing burning or damage due to the light focusing, and the degree of freedom in designing the image display device can be increased. The effect of reducing light attenuation can be obtained.

According to the present invention, the condensing means has a parabolic converging surface mirror formed by rotating the parabola about a rotation axis perpendicular to the parabola and passing through the focal point. Therefore, the number, arrangement and optical characteristics of the light source means are not restricted, and parallel light can be focused at the focal point, and the degree of freedom in designing the image display device can be increased. The effect that the attenuation of the light in the light collector can be reduced is obtained.

According to the present invention, the condensing means is provided with the converging surface mirror formed in a spherical shape and the diffractive optical means for correcting the aberration caused by the converging surface mirror. The light source means can be focused on the focal point without being restricted by the light source means with respect to the optical characteristics, the degree of freedom in designing the image display device can be increased, and the light attenuation in the light collector can be achieved. Can be reduced.

According to the present invention, the converging means has a parabolic converging mirror formed by rotating the parabola around a rotation axis which passes through the focal point and which is parallel to the parabola's quasi-linear line. A vertex is formed on the display means side with the rotation axis as the optical axis,
Since the condensing unit is provided with a conical mirror that receives parallel light emitted from the light source unit from the bottom surface and reflects the collimated light to the converging surface mirror, the light source unit is limited in terms of the number, arrangement, and optical characteristics. This allows the parallel light to be focused at the focal point without increasing the degree of freedom in designing the image display device, and the effect of reducing the attenuation of light in the light collector can be obtained. Can be

According to the present invention, the condensing means has a parabolic converging mirror formed by rotating the parabola around a rotation axis which passes through the focal point and is parallel to the parabola of the parabola. A bottom surface is formed on the display means side with the rotation axis as an optical axis,
Since the condensing unit is provided with a conical mirror that receives parallel light emitted from the light source unit from the bottom surface and reflects the collimated light to the converging surface mirror, the light source unit is limited in terms of the number, arrangement, and optical characteristics. Parallel light can be condensed at the focal point without increasing the degree of freedom in designing the image display device, light attenuation in the light collector can be reduced, and dead space can be reduced. Is effectively used to reduce the thickness of the image display device.

According to the present invention, the Fresnel mirror in which the shape of the light-collecting surface mirror divided into a plurality of small areas is formed is used as the light-collecting means, so that the degree of freedom in designing the image display device is increased. Therefore, it is possible to reduce the attenuation of light in the light collector and to reduce the manufacturing cost of the image display device.

According to the present invention, since the light receiving / irradiating means is provided with the rod integrator in which the incident surface is provided at the focal point of the focusing mirror, the number of light source means can be increased without causing burning or damage. And the effect of increasing the light intensity on the display means can be obtained.

According to the present invention, a parabolic mirror formed by rotating a parabola around a rotation axis perpendicular to the parabola's quasi-line and passing through the focal point, and light installed at the focal point of the parabolic mirror Since the light source means is provided with a luminous body which emits light, an effect that parallel light can be generated with a simple configuration can be obtained.

According to the present invention, an ellipsoidal mirror formed by rotating an ellipse around a rotation axis passing through one focal point and the other focal point of an ellipse, and light emitted by being installed at one focal point Since the light source is provided with a luminous body, a diffusion plate provided with a small opening provided at the other focal point, and an aspheric lens that emits light emitted from the small opening as parallel light, the luminous body is The emitted light is reflected by the ellipsoidal mirror, passes through the small aperture, and can be emitted as parallel light by the aspherical lens, so that the effect of using parallel light with higher parallelism can be obtained.

According to the present invention, the diffusion plate has a scattering surface for scattering the light emitted from the light emitter on the surface on the light emitter side, and the diffusion plate has a plurality of spherical lenses arranged on the scattering surface. Therefore, light that does not pass through the small aperture repeatedly reflects between the diffusing surface and the ellipsoidal mirror until it passes through the small aperture. The effect that the efficiency can be increased is obtained.

According to the present invention, a luminous body that emits light,
The light source means includes a plurality of aspherical lenses provided to surround the illuminant and emits light emitted by the illuminant as parallel light, and a plurality of plane mirrors for reflecting the parallel light from the aspherical lens to the condensing means. With this configuration, it is possible to use the parallel light having higher parallelism, and to increase the use efficiency of the light emitted from the light emitter.

According to the present invention, the light emitting diode which emits parallel light is used as the light source means, so that the effect that the manufacturing cost of the image display device can be reduced can be obtained.

According to the present invention, since a plurality of light source means are arranged according to the light distribution characteristics of the display means, the effect of optimizing the light distribution to the display means can be obtained.

According to the present invention, the auxiliary light sources having different light distribution characteristics are provided in the light source means, so that the effect of optimizing the light distribution to the display means can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an optical system configuration of an image display device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a light amount distribution at a light condensing position when two parallel laser beams are incident on a light collector.

FIG. 3 is a diagram showing an optical system configuration of an image display device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a light amount distribution at a light condensing position when two parallel laser beams are incident on a light collector.

FIG. 5 is a diagram showing an optical system configuration of an image display device according to a third embodiment of the present invention.

FIG. 6 is a diagram showing an optical system configuration of an image display device according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged view of a cross section of a Fresnel mirror.

FIG. 8 is a diagram showing a relationship between a plurality of light source units and a light collector in an image display device according to a fifth embodiment of the present invention.

FIG. 9 is a diagram showing a relationship between a plurality of light source means and a light collector in an image display device according to a sixth embodiment of the present invention.

FIG. 10 is a diagram showing an optical system configuration of an image display device according to a seventh embodiment of the present invention.

FIG. 11 is a diagram showing an optical system configuration of an image display device according to an eighth embodiment of the present invention.

FIG. 12 is a diagram showing an optical system configuration of an image display device according to a ninth embodiment of the present invention.

FIG. 13 is a diagram showing an optical system configuration of a conventional image display device disclosed in Japanese Patent Application Laid-Open No. 6-242397.

[Explanation of symbols]

1, 1a, 1b light emitter (light source means), 2a, 2b parabolic mirror (light source means), 3a, 3b light source means, 4 light collector (light collecting means), 4x light collecting plane mirror, 5 rod integrator ( Light receiving and irradiating means), 6 relay lens (light receiving and irradiating means), 7 light valve (image information adding means), 8
Projection optical system (display means), 9 screen (display means), 10 light collector (light collection means), 10x conical mirror (light collection means), 10y parabolic mirror (light collection means, light collection plane mirror) , 11 condenser (condenser), 11x conical mirror (condenser), 11y parabolic mirror (concentrator, condenser mirror),
12 Fresnel mirror (light collecting means, light collecting surface mirror), 12a
１２12f Dividing surface, 3a〜3i light source means, 13a, 13
b light source means, 14 elliptical mirror (light source means), 15 spherical lens (light source means), 16 diffuser plate (light source means), 1
6z Small aperture (light source means), 17 aspherical lens (light source means), 18 lens holding mechanism, 19a-19d aspherical lens (light source means), 20b-20e Plane mirror (light source means), 21a-21d Light emitting diode (light source means) ).

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshihito Hirano 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Masahiko Shimizu 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. (72) Inventor Shuzo Wadaka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5C058 AA00 BA05 BA08 BA23 BA35 EA02 EA51 5G435 AA03 AA17 AA18 BB15 CC09 DD04 EE26 FF03 FF06 FF07 FF12 GG05 GG08 GG23 GG26 GG28 HH04 LL15

Claims (14)

[Claims] 1. An image display comprising: image information providing means for providing image information to irradiation light; and display means for receiving the irradiation light provided with the image information and displaying an image based on the image information. In the apparatus, a light source unit that emits parallel light having an equal phase plane as a plane, a light-collecting unit that has a light-collecting surface mirror that reflects the parallel light and collects the light at a focal point, and the parallel light focused at the focal point An image display device comprising: a light receiving and irradiating unit that receives light and irradiates the irradiation light to the image information providing unit. 2. The condensing means comprises a parabolic converging mirror formed by rotating the parabola about a rotation axis perpendicular to the parabola and passing through the focal point. The image display device according to claim 1. 3. The image display according to claim 1, wherein the light condensing means comprises a light converging mirror formed in a spherical shape, and a diffractive means for correcting aberration caused by the light converging mirror. apparatus. 4. The condensing means has a parabolic converging mirror formed by rotating the parabola about a rotation axis which passes through the focal point and is parallel to a parabola quasi-line. A vertex is formed on the display means side with the axis as the optical axis,
2. The image display device according to claim 1, further comprising a conical mirror that receives parallel light emitted from the light source means from a bottom surface side and reflects the parallel light to the light-collecting surface mirror. 5. The condensing means has a parabolic converging mirror formed by rotating the parabola about a rotation axis parallel to a parabola and passing through a focal point. A bottom surface is formed on the display means side with the axis as an optical axis,
The image display device according to claim 1, further comprising a conical mirror that receives parallel light emitted from the light source means from the bottom surface side and reflects the parallel light to the light-collecting surface mirror. 6. The image display apparatus according to claim 1, wherein the light condensing means is a Fresnel mirror in which a shape of a light converging mirror divided into a plurality of small areas is formed. 7. The image display according to claim 1, wherein the light receiving and irradiating means includes a rod integrator having an incident surface provided at a focal point of the light collecting surface mirror. apparatus. 8. A parabolic mirror formed by rotating the parabola around a rotation axis perpendicular to the parabola and passing through the focal point, and a light source means is provided at a focal point of the parabolic mirror. The image display device according to any one of claims 1 to 7, further comprising a light emitter that emits light. 9. An elliptical mirror formed by rotating the ellipse around a rotation axis passing through one focal point and the other focal point of the ellipse, and a light source installed at the one focal point. A light-emitting body that emits light, a diffusion plate provided with a small opening provided at the other focal point, and an aspheric lens that emits the light emitted from the small opening as parallel light. The image display device according to claim 1. 10. The diffusing plate has a scattering surface for scattering light emitted from the luminous body on a surface on the luminous body side, and includes a plurality of spherical lenses arranged on the scattering surface. The image display device as described in the above. 11. A light source means, a luminous body that emits light, a plurality of aspherical lenses provided so as to surround the luminous body, and emits light emitted by the luminous body as parallel light, and the aspherical lens. The image display device according to any one of claims 1 to 7, further comprising: a plurality of plane mirrors for reflecting the parallel light from the light source to a light collecting means. 12. The image display device according to claim 1, wherein the light source is a light emitting diode that emits parallel light. 13. The image display apparatus according to claim 1, wherein a plurality of light source means are arranged according to light distribution characteristics to the display means. 14. The image display device according to claim 1, wherein the light source has auxiliary light sources having different light distribution characteristics.