JPH10274750A - Illumination device for projection device and projection device - Google Patents

Abstract

(57) [Problem] To provide an illumination device capable of brightening illumination light to a light valve without changing a conventional light source, and a projection device using the illumination device. SOLUTION: In the vicinity of a second lens plate 3 of a fly-eye integrator 4, a partially reflecting mirror member 5 partially having a reflecting mirror layer is arranged, and a quarter-wave plate 5c.
Are arranged, and the light emitted from the second lens plate 3 is transmitted through the portion of the partial reflection mirror member 5 where the mirror layer is not formed, is emitted, is incident on the polarization device 6, is polarized and separated, and is polarized.
, And the second polarized light reflected by the polarizing device 6 and reflected in the direction of the light source. The first polarized light irradiates the light valve 17B.
After passing through the wave plate 5c, the light enters the reflection mirror layer, is reflected by the reflection mirror layer, and passes through the quarter-wave plate 5c again, thereby being converted into the first polarized light, transmitted through the polarizing device 6, and transmitted through the light valve. 17B ... are irradiated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to light of three primary colors including red light (hereinafter referred to as "R light"), blue light (hereinafter referred to as "B light") and green light (hereinafter referred to as "G light"). A lighting device that separates the colors and makes them incident on liquid crystal light valves respectively arranged for the color light, and modulates the incident light with a liquid crystal light valve, synthesizes the modulated light into colors, and performs color projection with a projection optical system. The present invention relates to a projection device for projecting an image, and more particularly to an improvement in an illumination optical system having good illumination efficiency for a light valve.

[0002]

2. Description of the Related Art Conventionally, light of a light source emitted from a light source is separated into three primary colors of R light, G light and B light, and a reflection type light valve is arranged for each color light, and the light enters the light valve. As a projection device that modulates each color light with light or an electric signal for each color and emits the light, combines the emitted light with a color combining optical system, and projects a color projection image with a projection lens, for example, as shown in FIG. Such devices are known.

In the figure, reference numeral 201 denotes a light source.
Is composed of a lamp and a concave mirror such as an elliptical mirror. Light emitted from the light source 201 is reflected by an R light reflecting dichroic mirror 202 disposed on the optical axis in a direction perpendicular to the incident optical axis. The light is color-separated into G light and B mixed light traveling in the same direction as the incident optical axis. Further, the mixed light is directed by a G light reflecting dichroic mirror 203 arranged on the optical axis to a direction perpendicular to the optical axis, that is, a G light traveling in a direction parallel to the R light, and a G light traveling in the same direction as the incident optical axis. And the B light that travels to the right.

As described above, each dichroic mirror 20
The R light, G light, and B light separated into three colors by 2, 203 are incident on polarization beam splitters (PBS) 204R, 204G, 204B arranged for each light.
Each polarization beam splitter 204R, 204G, 204B
Of the respective colors, the P-polarized light of each color transmitted in the direction of the optical axis incident thereon and the S-polarized light reflected by the polarization splitter and reflected in a direction perpendicular to the incident optical axis. .

[0005] Then, a polarization beam splitter 2 for each color.
04R, 204G, and 204B, only the reflected S-polarized light out of the light incident on the polarization beam splitter 204.
R, 204G, and 204B are incident on reflective light valves 205R, 205G, and 205B disposed near the exit surfaces. The P-polarized light of each color is discarded as unnecessary light.

Next, each reflection type light valve 205R,
The light (S-polarized light) incident on 205G and 205B is generated by a write light signal for each color light if these light valves 205R, 205G and 205B are of the optical writing type, or if they are of the electric writing type. The modulated light is subjected to a modulation action by an electric signal of each color light, and the modulated light is emitted as P-polarized light, and the other light is emitted as mixed light of both polarized lights while the incident S-polarized light remains.
04R, 204G, and 204B again, and only the modulated light is polarized beam splitters 204R, 204G, and 204B.
The light passes through the polarized light separating portion B and travels to be projected light. The unmodulated light is reflected by the polarization separation unit, travels backward toward the light source, and is discarded.

Here, the polarization beam splitter 204B
Is transmitted through the G light reflecting dichroic mirror 206 and travels in the same direction as the incident direction.
G light reflection / B light reflection / R light transmission dichroic mirror 2
At 07 it is reflected at right angles.

The G light modulated light transmitted through the polarization beam splitter 204G is reflected by the G light reflecting dichroic mirror 206, travels in the same direction as the B light, and reflects G light, B light reflected, and R light transmitted. The light is reflected by the dichroic mirror 207.

Further, the R light modulated light transmitted through the polarization beam splitter 204R passes through the dichroic mirror 207, is combined with the B light and G light modulated light, travels, and is projected as a color image by the projection lens 208. Is done.

[0010]

However, in such a conventional device, R light and G light separated into three colors are used.
The light and the B light are respectively incident on the polarization beam splitters 204R, 204G, and 204B arranged for each color, and the polarization beam splitters 204R, 204G, and 204B.
The light valves 205R, 205G, and 205B can illuminate only with the amount of S-polarized light because the P-polarized light transmitted through the light is discarded. Therefore, it is considered that the brightness of the projected color image is sufficient. I could not say it. In particular, in the case of a device that projects on a large screen, there has been a big problem.

In order to make the projected image brighter, the output of the light source 201 may be increased first. However, doing so increases the required amount of power, the problem of cooling due to the heat generated by the light source unit, and the light amount. A new problem, such as the disposal of the waste light, increases with the increase.

Therefore, the present inventors have studied a method of brightening illumination light to a light valve while using a conventional light source, and have accomplished the present invention.

[0013]

In order to solve this problem, the invention described in claim 1 comprises a light source for emitting randomly polarized light, a first lens plate having a plurality of lenses in a plane, and a plurality of lenses. A fly-eye integrator comprising a second lens plate having a lens in a planar shape, and decomposing the light emitted from the light source into a light beam determined by the aperture of each lens of the first lens plate; The second
In a lighting device for a projection device that collects light on each lens of a lens plate and illuminates light emitted from the second lens plate so as to be superimposed on a light valve, in the vicinity of the second lens plate or the second lens plate On top of this, a reflecting mirror layer is partially provided, and a 波長 wavelength plate is arranged in proximity to the reflecting mirror layer,
Further, a polarization device that separates the light emitted from the light source into first and second polarized lights having vibrations in directions perpendicular to each other, and arranges a polarization device that emits the light in different directions from each other is provided. The first polarized light transmitted through the non-mirror layer-forming portion where the reflection mirror layer is not formed, is incident on the polarizing device, is polarized and separated, passes through the polarizing device, and is reflected by the polarizing device and is reflected by the polarizing device. The light is separated into second polarized light reflected in the direction of the light source, the first polarized light irradiates the light valve, and the second polarized light is incident on the reflecting mirror layer via the 波長 wavelength plate, and the reflecting mirror The light is reflected by a layer, passes through the quarter-wave plate again, is converted into the first polarized light, and is transmitted through the polarizing device to irradiate the light valve. To be

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the polarizing device includes a plurality of polarizing beam splitters arranged in a direction perpendicular to the optical axis such that the side surfaces contact each other. And the polarization beam splitters of the polarization beam splitters are set so as to have a sawtooth shape orthogonal to each other.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the polarizing device has a transparent surface having alternately repeated peaks and valleys each exhibiting a right angle. By setting the peaks and the valleys of the two members together and bonding them together with the polarization separation film interposed therebetween, the respective polarization separation parts are set so as to be orthogonal to each other and have a sawtooth shape. It is characterized by the following.

According to a fourth aspect of the present invention, in addition to the configuration of the second or third aspect, the light passes through the portion where the mirror layer is not formed, enters the polarization device, and passes through the polarization separation portion. And the second polarized light reflected by the polarized light separating unit, and the second polarized light is further separated into:
The light is reflected by the polarization separation unit adjacent to the polarization separation unit and is reflected in the light source direction.

According to a fifth aspect of the present invention, in addition to the configuration of any one of the first to fourth aspects, a plurality of field lenses are arranged between the second lens plate and the light valve. It is characterized by having.

According to a sixth aspect of the present invention, in addition to the configuration according to any one of the first to fourth aspects, an illumination device and illumination light from the illumination device are modulated by image information.
In a projection device having a light valve as a modulation unit that emits the light as a light including the modulated light, a light analysis unit that detects the light emitted from the light valve, and a projection optical system that projects the detection light. The illumination device is a projection device according to any one of claims 1 to 5.

According to a seventh aspect of the present invention, in addition to the configuration of the sixth aspect, the light valve is a reflection type light valve, and the light analyzing means is a polarization beam splitter. I do.

According to an eighth aspect of the present invention, in addition to the configuration of the sixth aspect, the light valve is a transmission type light valve, and the light analyzing means is a polarizing plate. .

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment of the Invention] FIGS. 1 to 7 show a first embodiment of the present invention.

FIG. 1 is a configuration diagram for explaining the entire projection apparatus according to the first embodiment.

In the figure, reference numeral 1 denotes a light source composed of a lamp and a concave mirror such as an elliptical mirror, from which random polarized light is emitted.

This random polarized light is converted into a substantially parallel light beam by a shaping lens (not shown), and further passes through an infrared absorption filter and an ultraviolet absorption filter (not shown). The fly-eye integrator includes a first lens plate 2 and a second lens plate 3. 4 is incident. These first and second
Each of the lens plates 2 and 3 has a plurality of lenses 2a and 3a formed in a plane as shown in FIGS.

Thereafter, light is incident on the field lens 7 via the partial reflection mirror member 5 and the polarizing device 6 disposed near the second lens 3.
In this partially reflecting mirror member 5, a plurality of reflecting mirror layers 5b are formed partially on a transparent glass plate 5a as shown in FIG. 1 and FIG. 4 and the like. Light is transmitted through the formed portion 5d. Further, a quarter-wave plate 5c having substantially the same size as the transparent glass plate 5a is disposed close to the left side of the reflection mirror layer 5b in the drawing, and the light transmitted through the non-mirror layer forming portion 5d is reduced by 1 /. 4
The light is transmitted through the wavelength plate 5c.

In the polarization device 6, a plurality of polarization beam splitters 8 are arranged in a direction perpendicular to the optical axis so that the side surfaces are in contact with each other. It is set so as to be orthogonal and serrated.

The light transmitted through the non-mirror layer forming portion 5d passes through the polarization splitting portion 8a of the polarization beam splitter 8, and is split into first and second polarized lights. The light is transmitted as it is and is incident on the field lens 7. The S-polarized light that is the “second polarized light”
The light is reflected in a direction orthogonal to the optical axis by the polarization separation unit 8a arranged obliquely with respect to the optical axis, enters the polarization separation unit 8a adjacent to the polarization separation unit 8a, and is reflected in the direction of the light source 1. . Thus, the light enters the reflection mirror layer 5b via the quarter-wave plate 5c, is reflected by the reflection mirror layer 5b, passes through the quarter-wave plate 5c again, and is converted into P-polarized light. The light enters the field lens 7 together with the polarized light.

Then, the light enters the cross dichroic mirror 9 via the field lens 7. The cross dichroic mirror 9 is arranged in an X-shape such that an R / G light reflecting dichroic mirror 10 and a B light reflecting dichroic mirror 11 are orthogonal to each other.
The B light is reflected by the light reflecting dichroic mirror 11 and travels in a direction perpendicular to the incident optical axis.
The light further changes the traveling direction to a right angle, further travels, and is incident on the B light polarizing beam splitter 14B as the "analyzing means" via the B light field lens 13B.

On the other hand, the mixed R and G light reflected by the R / G light reflecting dichroic mirror 10 travels with the bending mirror 15 changing the optical axis to a right angle,
The light is incident on the G light reflecting dichroic mirror 16 arranged at an incident angle of 5 degrees, is color-separated into R light that transmits and travels in the same direction as the incident optical axis, and G light that is reflected at right angles,
After passing through the field lenses 13R and 13G, respectively, the polarization beam splitters 14R for each color light as "analyzing means".
It is incident on 14G.

Then, each polarization beam splitter 14B,
The P-polarized light of each color incident on 14R and 14G is transmitted through the polarization separation unit and emitted. The emitted light is incident on and reflected by the reflection type light valves 17B, 17R, 17G arranged near the exit surfaces of the beam splitters 14B, 14R, 14G.

As described above, each color light valve 17B,
Illumination to 17R, 17G will be described. Thus, according to the present invention, the S-polarized light that is conventionally discarded is reflected by the reflection mirror layer 5b and the quarter-wave plate 5c of the partial reflection mirror member 5,
Since the light valves 17B, 17R, and 17G can be illuminated by being converted into P-polarized light by the polarizer 6 and the like, efficient superimposed illumination can be achieved.

Thereafter, each light valve 17B, 17R,
The P-polarized illumination light incident on 17G is modulated by the image signals of the light valves 17B, 17R, and 17G, and the modulated light becomes S-polarized light and is mixed with unmodulated light (P-polarized light). Light valves 17B, 17R, 17
G, the polarization beam splitter 14 for each color light
Only the modulated light is reflected by the polarization separation units of B, 14R, and 14G, and the unmodulated light is transmitted and discarded, thereby achieving the light detection.

Then, each polarization beam splitter 14B,
The analysis light reflected and emitted from 14R and 14G enters the cross dichroic prism 18 constituting the color combining optical system from different entrance surfaces. The prism 18
The B light reflecting dichroic film 18B orthogonal to each other
And the R light reflecting dichroic film 18R, the incident R light is reflected by the dichroic film 18R, the B light is reflected by the dichroic film 18B in the same direction, and the G light is transmitted by the two films 18R and 18B. The light also travels in the same direction, is emitted as projection light of R light, G light and B light, and is projected by a projection lens 19 as a “projection optical system”.
And projected as a high-luminance color image on a screen (not shown).

Here, the illumination optical system for each of the light valves 17B, 17R, and 17G as an object to be illuminated according to the present invention will be described in more detail.

FIG. 2 shows the light valve 17 of the projection device.
FIG. 2 shows a main part of an illumination optical system for B, 17R, and 17G and a ray diagram thereof. Originally, R light, G light and B light should be described. However, the three light valves 17B and 17R have the same optical path length and the same basic configuration for all three colors. , 17G as a light valve 17, and the polarization beam splitters 14B, 14R, and 14G are also polarization beam splitters 14G.
The field lenses 13B, 13R, and 13G are also described as the field lens 13. The illustration of the three-color separation / synthesis optical system and the bending mirror is omitted.

FIG. 3 is a perspective view showing the shape of the first lens plate 2. As shown in this figure, the surface has a configuration in which 5 × 5 convex lenses 2a are arranged in a plane, and the surface opposite to the formation of the lens 2a is a plane.

The outer shape of the second lens plate 3 is substantially the same as that of the first lens plate 2 of FIG. 2, and the arrangement of the lenses 3a formed of convex lenses on the surface is the same as that of the first lens plate 2. It is the same array as 2 and 5 × 5. However, the shape of the lens 3a is different between the first lens plate 2 and the lens 2a. Lens 2 of first lens plate 2 and second lens plate 3
This is because a and 3a have different purposes.

In the first embodiment, the light source light from the light source 1 is shaped into a substantially parallel light beam by a shaping optical system (not shown), and is incident on the first lens plate 2. Each parallel light beam is set to converge on the opposite lens 3a on the second lens plate 3 by the aperture determined by the aperture. That is, the shape of the lens 2a on the first lens plate 2 is determined so that the lens 3a of the second lens plate 3 is arranged at a substantially focal position of the lens 2a of the first lens plate 2, and the second lens plate 3 is determined. The light spot on the lens 2a of the first lens plate 2 is formed by the opposing lens 3a on the second lens plate 3 so as to form an image on the light valve 17 via the field lens 7 and the field lens 13 so as to form an image. The shape of the lens 3a of the two-lens plate 3 is determined.

FIG. 4 shows the structure of the partial reflection mirror member 5 disposed close to the exit surface of the second lens plate 3. As described above, this has a configuration in which a reflective mirror layer 5b of aluminum or the like is formed on a transparent glass plate 5a in the shape of a strip in the vertical direction.

When the lens is disposed close to the second lens plate 3, the center position of the band of the reflection mirror layer 5 b is connected to the connecting line of the boundary between the individual lenses 3 a on the second lens plate 3. They are arranged so as to substantially match. The width of the reflecting mirror layer 5b of the partially reflecting mirror member 5 in the present embodiment is formed so that the ratio between the reflecting mirror layer 5b and the non-mirror layer forming portion 5d is substantially the same.

Further, a quarter-wave plate 5c and a polarizing device 6 are arranged close to the partial reflection mirror member 5.

Further, as shown in FIG. 5 and the like, the polarizing device 6 comprises a plurality of polarizing beam splitters 8 having a square horizontal section and a rectangular parallelepiped shape elongated in the vertical direction. And are adhered to each other in a direction orthogonal to. Each of the polarization beam splitters 8a of each of the polarization beam splitters 8 is set so as to be orthogonal to each other and continuous in a sawtooth shape.

In the polarization device 6, the directions of inclination of the polarization splitting portions 8a of the polarization beam splitter 8 on which light transmitted through the non-mirror layer forming portion 5d of the partial reflection mirror member 5 are all the same and parallel. As well as
The polarization beam splitter 8a of the polarization beam splitter 8 is configured to be orthogonal to the polarization beam splitter 8a of the adjacent polarization beam splitter 8.

Furthermore, the position of each of the polarizing beam splitters 8 constituting the polarizing device 6 is determined by the position of the reflecting mirror layer 5b of the partial reflecting mirror member 5 and the portion 5 where the mirror layer is not formed.
It is arranged so as to substantially coincide with the boundary with d.

Next, how the first lens plate 2, the second lens plate 3, and the field lenses 7, 13 form an image on the light valve 17 will be described with reference to FIGS. Will be explained.

FIG. 2 shows the polarization beam splitters of the polarization device 6 for the two outermost rays of the opening formed by the lens 2a of the first lens plate 2 and the three rays which enter the center parallel to the optical axis. FIG. 9 is a ray diagram illustrating a state of condensing the P-polarized light transmitted through the polarization separation unit 8a on the light valve 17 for each of the lenses 2a of the first lens plate 2; is there.

According to this, of the light rays incident on the respective openings of the first lens plate 2, the light rays incident parallel to the optical axis and passing through the center of the respective openings are the first rays of the second lens plate 3. The light passes through the central portion of the lens 3a facing the opening of the one-lens plate 2, passes through the transparent portion of the non-mirror layer forming portion 5d of the partial reflection mirror member 5, passes through the quarter-wave plate 5c, and is polarized. The light enters the polarization beam splitter 8 of the device 6 and is polarized and separated into P-polarized light that passes through the polarization beam splitter 8 and S-polarized light that is reflected by the polarization separation unit 8a of the polarization beam splitter 8. The transmitted and emitted P-polarized light travels in parallel to the optical axis (that is, while maintaining telecentric characteristics), and is polarized by the field lens 7 and the field lens 13 into the polarization beam splitter 14.
And is condensed at a substantially central portion of the light valve 17.

Here, of the light rays parallel to the optical axis passing through the central part of each lens 2a, 3a of the first lens plate 2 and the second lens plate 3, the light is split by the polarization splitting section 8a of the polarizing beam splitter 8. The reflected S-polarized light enters the adjacent polarization beam splitter 8 as shown in the enlarged view of the vicinity of the polarization device 6 in FIG. 6, is reflected again by the polarization splitting unit 8a, and travels in the direction of the light source 1. Then, the light is converted into circularly polarized light by the quarter-wave plate 5c, enters the reflection mirror layer 5b of the partial mirror reflection member 5, travels again by being reflected by the reflection mirror layer 5b, and travels the same as the incident optical axis. The light travels backward in the optical axis and is converted again into P-polarized light via the quarter-wave plate 5c. Similarly, the light is emitted parallel to the optical axis, that is, while maintaining telecentric characteristics. Field Len as shown in ray diagram Through 7 and 13, it is focused on a substantially central portion of the light valve 17 passes through the polarizing beam splitter 14.

As shown in FIG. 2, the first lens plate 2
The light rays incident on the upper portions of the respective apertures in parallel with each other with respect to the optical axis are different from the configuration in which the second lens plate 3 is disposed at the focal position of the lens 2a of the first lens plate 2 as described above.
At the center of the lens 3a of the second lens plate 3, the light intersects with the light beam passing through the center of the opening on the first lens plate 2, and the transparent portion of the non-mirror layer-forming portion 5d of the partial reflection mirror member 5 is similarly moved. The light is transmitted through the quarter-wave plate 5c, enters the substantially central portion of the polarization beam splitter 8 constituting the polarization device 6, is polarized by the polarization beam splitter 8a of the polarization beam splitter 8, and is transmitted as it is. The polarized light is focused on the lower part of the light valve 17 by the field lens 7 and the field lens 13.

Here, of the incident light, the S-polarized light reflected by the polarization separation section 8a of the polarization device 6 enters the adjacent polarization beam splitter 8, as shown in the enlarged explanatory view of FIG. The light is reflected and emitted in the direction of the light source 1 by the separation unit 8a, passes through the quarter-wave plate 5c and becomes circularly polarized light, and the reflection mirror layer 5b of the partial reflection mirror member 5 has a predetermined inclination with respect to the optical axis. Bring incident, the reflection mirror layer 5
b, the light is reflected by the law of reflection, passes through the quarter-wave plate 5c again, is converted into P-polarized light, is incident on the polarizing beam splitter 8 of the polarizing device 6, is transmitted therethrough, and is transmitted with respect to the optical axis. The light travels with a predetermined inclination, passes through the field lenses 7 and 13, and is condensed on the light valve 17 as shown in the overall view of FIG.

Further, as shown in FIG. 2, light rays incident on the lower part of each opening of the first lens plate 2 in parallel to the optical axis with each other are reflected by the lens 2a of the first lens plate 2 as described above. From the configuration in which the second lens plate 3 is arranged at the focal position,
At the center of the lens 3a of the second lens plate 3, the light intersects with the light beam passing through the center of the opening on the first lens plate 2, and the transparent portion of the non-mirror layer-forming portion 5d of the partial reflection mirror member 5 is similarly moved. The light passes through the quarter-wave plate 5c, enters the substantially central part of each of the polarization beam splitters 8 constituting the polarization device 6, and is polarized by the polarization separation unit 8a of the polarization beam splitter 8.
The P-polarized light, which is polarized and separated by and is transmitted as it is, is collected by the field lens 7 and the field lens 13 on the upper part of the light valve 17 in the figure.

Here, of the incident light, the S-polarized light reflected by the polarization separation section 8a of the polarization beam splitter 8 of the polarization device 6 is transmitted to the adjacent polarization beam splitter 8 as shown in the enlarged explanatory view of FIG. The light is incident, reflected by the polarization splitting portion 8a of the polarization beam splitter 8, emitted in the direction of the light source 1, transmitted through the quarter-wave plate 5c to become circularly polarized light, and reflected by the reflection mirror layer of the partial reflection mirror member 5. 5b with a predetermined inclination with respect to the optical axis, and is reflected again by the reflection mirror layer 5b according to the law of reflection.
After being transmitted through the 波長 wavelength plate 5 c, it is converted into P-polarized light, enters the polarization beam splitter 8 of the polarization device 6, transmits therethrough, travels with a predetermined inclination with respect to the optical axis,
The light is condensed on the lower part of the light valve 17 through the field lenses 7 and 13 as shown in FIG.

As described above, the partially reflecting mirror member 5
Out of the randomly polarized light source light transmitted through the transparent portion of the non-mirror layer-formed portion 5d and incident on the polarizing device 6, in addition to the P-polarized light transmitted through the polarizing device 6 and illuminating the light valve 17, The S-polarized light reflected by the polarization beam splitter 8a of the polarization beam splitter 8 included in the polarization device 6 enters the adjacent polarization beam splitter 8, and the polarization beam splitter 8a of the polarization beam splitter 8 converts the incident S-polarized light into Since it is arranged in the direction in which the light is incident on the reflection mirror layer 5b of the partial reflection mirror member 5, the light travels so as to be incident on and reflected by the reflection mirror layer 5b of the partial reflection mirror member 5, and the reflection mirror layer 5b By passing twice through the quarter-wave plate 5c arranged in the portion, it is converted into P-polarized light,
The light can pass through the polarization beam splitter 14 for analysis disposed immediately before the light valve 17 and efficiently enter the light valve 17.

That is, conventionally discarded S-polarized light is converted into P-polarized light according to the present invention and can be incident on the light valve 17 and contribute to illumination.
The light source light incident on the light source 17 is first transmitted through the polarizer 6 and is superimposed on the P-polarized light that illuminates the light valve 17, whereby high-luminance illumination can be achieved. Even in this case, it is possible to achieve a great effect that high luminance of the projected image can be achieved. Further, in the present invention, since the so-called fly-eye integrator 4 using the first lens plate 2 and the second lens plate 3 is used, the first lens plate 2 is divided by the individual apertures of the lens 2a. Since the light flux is superimposed on the light valve 17 by the lens 3a of the second lens plate 3, the effect of achieving uniform illumination can be achieved in addition to the above-described effect.

[Second Embodiment of the Invention] FIG. 8 shows a second embodiment of the present invention.

In the first embodiment, the shape of the reflection mirror layer 5b of the partial reflection mirror member 5 is a vertical band, whereas in the second embodiment, the reflection mirror layer 5b has a horizontal band. I have.

This partial reflection mirror member 5 is arranged at a position near the second lens plate 3 as in the projection device of FIG.
The reflection mirror layer 5b of the partial reflection mirror member 5 is located at a position close to the horizontal line of the joint portion of the lens 3a of the second lens plate 3.
The center of the band must be arranged. That is,
The incident light flux condensed on the center of the lens 3a of the second lens plate 3 is transmitted to the non-mirror layer forming portion 5 of the partially reflecting mirror member 5.
d, and conversely, the partial reflection mirror member 5
This is to prevent the amount of light reflected by the reflection mirror layer 5b in the direction of the light source 1 and illuminating the light valve 17 from decreasing.

Further, in view of the configuration as an illumination device for the projection device, the length direction of the polarization beam splitter 8 constituting the polarization device 6 is made parallel to the length direction of the reflection mirror layer 5b of the partial reflection mirror member 5. Need to be placed. In the case of the second embodiment, in FIG. 2, only the partial reflection mirror member 5 and the polarization device 6 are moved 90 degrees with respect to an axis parallel to the optical axis.
Although the configuration is the same as the configuration in which the components are rotated by degrees, adopting such an arrangement means that light reflected on the polarization splitter is incident on the polarization splitter of the polarization beam splitter 14. Therefore, it is necessary to dispose the light valve 17 in the vicinity of the exit surface from which the light is reflected and emitted by the polarization splitting unit.

In the first and second embodiments, the second
Although the configuration is such that the partial reflection mirror member 5 is disposed on the side through which the lens plate 3 is transmitted, in the present invention, the position where the partial reflection mirror member 5 is disposed is near the light source 1 side of the second lens plate 3. It is good also as composition which arranges. In this case, 1 /
The arrangement position of the four-wavelength plate 5c may be a position sandwiched between the second lens plate 3 and the partial reflection mirror member 5, or a position between the second lens plate 3 and the polarizing device 6. Is also good.

[Third Embodiment of the Invention] FIG. 9 shows a third embodiment of the present invention.

In each of the first and second embodiments, the partial reflection mirror member 5 in which the reflection mirror layer 5b is formed on the transparent glass plate 5a is provided independently. The third embodiment differs from the first and second embodiments in that the mirror layer 5b is formed on the second lens plate 3.

That is, the reflection mirror layer 5 is provided on a plane portion of the second lens 3 opposite to the surface on which the lens 3a is formed and at a position corresponding to the boundary between the lenses 3a on the second lens plate 3.
b is formed in the shape of a vertical band, and the center of this band coincides with the boundary. In this case, the lens 3
It is important that light can be transmitted through the mirror layer non-forming portion 5d corresponding to the central portion a. Of course, it is needless to say that a horizontal band shape may be used instead of the vertical band shape.

As in this embodiment, the second lens plate 3
If the reflection mirror layer 5b is formed on the first embodiment, it is not necessary to separately prepare the partial reflection mirror member 5 as in the first embodiment, and the number of components can be reduced.

[Embodiment 4] FIGS. 10 to 14
Shows a fourth embodiment of the present invention.

In the fourth embodiment, the configuration of the polarizing device 22 is different from the polarizing device 6 of each of the above embodiments.
Further, the partial reflection mirror member 5 is not provided, and the reflection mirror layer 5b is directly provided on the second lens plate 3 as in the third embodiment.
Are formed.

That is, the polarizing device 22 is a transparent
The members 23 and 24 are bonded together. The members 23 and 24 are formed in a sawtooth shape by alternately and repeatedly forming right-angled peaks 23a and 24a and valleys 23b and 24b on one surface side, and the opposite surface side is formed. It has a planar shape. On one of the two members 23 and 24, a polarization separation film is formed on the inclined surface on the side where the peaks 23a and 24a and the valleys 23b and 24b are formed. Part 23
a, 24a and the valleys 23b, 24b are fitted together and bonded with an adhesive, so that each polarization splitting section 25
Are formed in a sawtooth shape at right angles to each other.

These peaks 23a, 24a (valleys 23b, 2
4b) and the pitch between the peaks 23a and 24a (valleys 23b and 24b) are set to be the same as the pitch between the reflection mirror layers 5b.

Even if such a polarization device 22 is used, the same operation as that of the polarization device 6 of each of the above embodiments can be achieved.

While the polarization device 6 of each of the above embodiments is configured by connecting a plurality of polarization beam splitters 8 by bonding, the fourth embodiment has two members 2.
Because it is configured by pasting 3, 24,
The structure is simple and the manufacture is easy.

The quarter-wave plate 5c in each of the above embodiments has a configuration in which one quarter-wave plate 5c is arranged.
For example, the same wavelength film is arranged alone or the partial reflection mirror member 5 or the configuration in which the same wavelength film is adhered to the entire surface of the polarizing device 6. However, the wavelength film is formed only by the reflection mirror layer 5 b of the partial reflection mirror member 5. It may be configured to be adhered to the upper portion, or to be configured to be cut into a strip shape and adhered to the polarizing device 6 at a position corresponding to the reflection mirror layer 5b in the same shape as the reflection mirror layer 5b. The light transmitted through the transparent portion of the non-mirror layer forming portion 5d of the partial reflection mirror member 5 is 1 /
This is because the presence of the four-wavelength plate 5c does not change the polarization itself.

As another example of the quarter-wave plate 5c,
The partial reflection mirror member 5 constituting the reflection mirror layer 5b
A configuration may also be adopted in which a quarter-wave plate 5c layer is formed on the reflection mirror layer 5b or the entire surface of the second lens plate 3 by oblique evaporation or the like. In this case, the reflection mirror layer 5b
Aluminum or the like may be formed in a predetermined shape by mask vapor deposition, and a titanium dioxide (TiO2) layer or the like may be formed thereon with a predetermined film thickness by an oblique vapor deposition method. Even if the band shape is appropriate, it can be formed on the reflection mirror layer 5b with high accuracy. Even in the case of this method, it is needless to say that the fast axis as a quarter-wave plate can be formed in a predetermined direction by controlling the tilt direction of the substrate during film formation.

Further, as a projection device, not only a projection device using a reflection type light valve as the light valve 17 as shown in FIG. 1 but also a projection device using a transmission type light valve to the light valve. As a device,
An illumination device for a projection device according to the present invention can be used. In this case, the polarization beam splitter 1 for analysis shown in FIG.
The role of 4 is that two polarizing plates constituting a cross Nicol sandwiching a transmission type light valve from both sides,
When the illumination device for a projection device according to the present invention is used, it is configured such that linearly polarized light having a vibration direction in a predetermined direction incident on the light valve 17 is transmitted through the polarizing plate on the incident side. It is possible to achieve the analysis by configuring a polarizing plate disposed on the emission side in the direction of absorbing the unmodulated light so that only the modulated light that has been emitted from the light valve 17 after being modulated by the modulation signal is transmitted. It is possible to propose a projection device having the effects according to the present invention.

[0074]

As described above, according to the invention described in each claim, the S-polarized light which has been conventionally discarded is P light.
Being converted into polarized light and incident on the light valve, which can contribute to illumination, the light source light originally incident on the polarizer and is superimposed with P-polarized light which transmits through the polarizer and illuminates the light valve. Accordingly, illumination with high luminance can be achieved, and a great effect of achieving high luminance of a projected image can be achieved even when the same light source as in the related art is used. Further, in the present invention, since the fly-eye integrator using the first lens plate and the second lens plate is used, the luminous flux divided by the individual apertures of the lenses of the first lens plate is converted to the second lens plate. Since the plate lens is superimposed on the light valve, uniform illumination can be achieved.

Further, if a reflection mirror layer is formed on the second lens plate, it is not necessary to separately prepare a partial reflection mirror member, and the number of parts can be reduced.

According to the third aspect of the present invention, since two transparent members having peaks and valleys are bonded to each other with the polarization separation film interposed therebetween, the configuration is simple. It is easy to manufacture.

According to the invention as set forth in any one of claims 6 to 8, by employing the illumination device having the above-mentioned effects in the projection device, a color projection image with high luminance and no illumination unevenness is obtained. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a projection device according to Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram showing an illumination optical system for a light valve of the projection device according to the first embodiment.

FIG. 3 shows a first example used in the projection device according to the first embodiment.
It is a perspective view of a lens plate.

FIG. 4 is a perspective view of a partially reflecting mirror member used in the projection device according to the first embodiment.

FIG. 5 is a perspective view of a polarizing device used in the projection device according to the first embodiment.

FIG. 6 is a ray diagram showing an operation of a polarizing device and a partially reflecting mirror member used in the projection device according to the first embodiment.

FIG. 7 is a ray diagram showing a state in which the light is reflected by the polarization splitting unit of the polarization device used in the projection device according to Embodiment 1 and illuminates the light valve.

FIG. 8 is a perspective view of a partially reflecting mirror member, showing Embodiment 2 of the present invention.

FIG. 9 is a perspective view of a second lens plate according to the third embodiment of the present invention.

FIG. 10 is a schematic diagram showing a configuration of a projection apparatus corresponding to FIG. 1 and showing Embodiment 4 of the present invention.

FIG. 11 is a schematic diagram showing an illumination optical system for a light valve corresponding to FIG. 2 and showing Embodiment 4;

FIG. 12 is a perspective view showing one embodiment of the fourth embodiment, showing one transparent member provided with a polarization separation film.

FIG. 13 is a ray diagram showing the operation of the polarizer and the partially reflecting mirror member corresponding to FIG. 6 and showing the fourth embodiment.

FIG. 14 is a ray diagram corresponding to FIG. 7, illustrating the fourth embodiment.

FIG. 15 is an explanatory diagram showing a conventional projection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light source 2 1st lens plate 2a lens 3 2nd lens plate 3a lens 4 Fly-eye integrator 5 Partial reflection mirror member 5a Transparent glass plate 5b Reflection mirror layer 5c Quarter wavelength plate 5d Mirror layer non-forming part 6,22 Polarizer 7 Field lens 8 Polarization beam splitter 8a, 25 Polarization separation unit 13,13B, 13R, 13G Field lens 14,14R, 14G, 14B Polarization beam splitter (measuring means) 17,17R, 17G, 17B Reflective light valve 19 Projection Lens (projection optical system) 23,24 Transparent member 23a, 24a Mountain 23b, 24b Valley

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G02F 1/13 505 G02F 1/13 505 1/1347 1/1347

Claims (8)

[Claims] 1. A light source for emitting randomly polarized light, and a fly-eye integrator comprising a first lens plate having a plurality of lenses in a plane and a second lens plate having a plurality of lenses in a plane. Decomposing the light emitted from the light source into a light flux determined by the aperture of each lens of the first lens plate, condensing each light beam on each lens of the second lens plate, The illumination device for a projection device, which illuminates the emitted light by superimposing it on a light valve, wherein a reflecting mirror layer is provided partially near or on the second lens plate and the reflecting mirror layer is provided. A quarter-wave plate is disposed in close proximity to the light source, and further, the light emitted from the light source is polarized and separated into first and second polarized lights having vibrations in directions perpendicular to each other, and polarized lights emitted in different directions from each other. Place the equipment Outgoing light from the light source is transmitted through a mirror layer non-formed portion where the reflection mirror layer is not formed, is emitted, is incident on the polarizing device, is polarized and separated, and has first polarized light transmitted through the polarizing device. Separating the light into a second polarized light reflected by the polarizing device and reflected in the light source direction, irradiating the light valve with the first polarized light, and passing the second polarized light through the 前 記 wavelength plate. The light enters the reflection mirror layer, is reflected by the reflection mirror layer, and
A lighting device for a projection device, wherein the light is converted into a first polarized light by passing through a quarter-wave plate again, and transmitted through the polarizing device to irradiate the light valve. 2. The polarizing device according to claim 1, wherein a plurality of polarizing beam splitters are arranged side by side in a direction orthogonal to an optical axis so that side surfaces thereof are in contact with each other, and each polarizing beam splitter of each polarizing beam splitter is orthogonal to each other. The illumination device for a projection device according to claim 1, wherein the illumination device is set to have a sawtooth shape. 3. The polarizing device includes two transparent members each having a surface formed by alternately repeating peaks and valleys each having a right angle, and fitting the peaks and valleys of the two members. By pasting together and sandwiching the polarization separation film,
2. The illumination device for a projection device according to claim 1, wherein each of the polarization separation sections is set to have a sawtooth shape orthogonal to each other. 4. A first light which passes through the portion where the mirror layer is not formed, is incident on the polarizing device, and passes through the polarized light separating portion.
The light is polarized and separated into the polarized light and the second polarized light reflected by the polarized light separating unit, and the second polarized light is further reflected by the polarized light separating unit adjacent to the polarized light separating unit and reflected toward the light source. The illumination device for a projection device according to claim 2 or 3, wherein: 5. The illumination device for a projection device according to claim 1, wherein a plurality of field lenses are arranged between said second lens plate and said light valve. . 6. An illuminating device, a light valve as modulation means for modulating illuminating light from the illuminating device according to image information and emitting the light as light containing the modulated light, and emitting light from the light valve. In a projection device having a light analyzing means for detecting light and a projection optical system for projecting the detected light, the illumination device is one according to any one of claims 1 to 5. Projection device. 7. The projection apparatus according to claim 6, wherein said light valve is a reflection type light valve, and said light analyzing means is a polarization beam splitter. 8. The projection apparatus according to claim 6, wherein said light valve is a transmission type light valve, and said light analyzing means is a polarizing plate.