JP2002049007A - Image projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image projector which can make a polarized light conversion system compact. SOLUTION: This image projector has a supplying section which supplies polarized light, a forming section which forms image light by this polarized light and a projecting section which projects this image light. The supplying section has planar polarizing elements and the units 20 of the planar polarizing elements consist of three incident side prisms 211 to 213, two exit side prisms 221 and 212, quarter wave plates 231 and 232 and polarized light separating effect films 241 and 242 which are respectively disposed on the contact surfaces of the incident side prism 211 and the exit side prisms 221 and 212, a total reflecting mirror 251 which is disposed on the contact surfaces of the incident side prism 212 and the exit side prisms 221 and a total reflecting mirror 253 which is disposed on the contact surfaces of the incident side prism 213 and the exit side prisms 222.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an image projection device.

[0002]

2. Description of the Related Art FIG. 12 is a configuration diagram showing a main part of a conventional example of this type of image projection apparatus.

This image projection apparatus includes a light source 101 that emits non-polarized light, such as a halogen lamp and a metal halide lamp, a reflecting mirror 102 that reflects a part of the non-polarized light emitted from the light source 101, and a light source 101 that emits unpolarized light. A heat ray cut filter 103 that absorbs or reflects the heat ray of the non-polarized light incident directly or via the reflection mirror 102, and a condenser lens 10 that converts the non-polarized light from which the heat ray has been removed into a parallel non-polarized light.
4 and a polarizer 105 that converts unpolarized parallel light into linearly polarized light
And a liquid crystal light valve 107, which is an image generator for generating an image by modulating the linearly polarized light according to a video signal, and only the component in the transmission axis direction of the linearly polarized light modulated by the liquid crystal light valve 107. Polarizing plate 108 that transmits light
And a projection lens 110 that is a projection optical system that projects the linearly polarized light transmitted through the polarizing plate 108 onto a screen (not shown) to project the image.

FIG. 13 is a main part configuration diagram showing another conventional example of this type of image projection apparatus.

In this image projection apparatus, two polarizing beam splitters 106 and 109 are arranged before and after a liquid crystal light valve 107, respectively, instead of the two polarizing plates 105 and 108 of the image projection apparatus shown in FIG. is there.

[0006] The image projection apparatus shown in FIGS. 12 and 13 uses only linearly polarized light transmitted through the polarizing plate 105 or the polarizing beam splitter 106 among the unpolarized light emitted from the light source 101 as illumination light for the liquid crystal light valve 107. Therefore, there is a disadvantage that linearly polarized light that does not pass through the polarizing plate 105 or the polarizing beam splitter 106 is lost, and the light use efficiency is reduced to 50% or less.

[0007] As an image projection device which has solved this disadvantage,
There is one described in JP-A-61-90584 shown in FIG.

In this image projection apparatus, a condenser lens
The non-polarized parallel light emitted from 104 enters polarization beam splitter 111, and the active surface of polarization beam splitter 111 (2
One of the P-polarized light L ^P at a deposition film) 111 ^a of the right-angle prism is formed on the bonded slopes each other is transmitted as it is, the S-polarized light L ^S is incident on the total reflection prism 112 is reflected perpendicularly upwards. The S-polarized light L ^S is reflected rightward by the total reflection prism 112 at right angles, so that the S-polarized light L ^P transmitted through the polarization beam splitter 111 is in the same direction as the P-polarized light L ^P.
Is emitted from. Here, the S-polarized light L ^S is linearly polarized light having a plane of polarization parallel to the working surface 111 ^a of the polarizing beam splitter 111, and the P-polarized light L ^P is an S-polarized light component L ^S
Linearly polarized light having a polarization plane orthogonal to A half-wave plate 113 is disposed on the emission side of the total reflection prism 112, and the S-polarized light L ^S emitted from the total reflection prism 112 is
The polarization plane is 90 ° by transmitting through the half-wave plate 113
It is rotated and converted to P-polarized light LP ^* . Also, wedge type lenses 114 and 115 for the optical path changing each arranged on the exit side of the polarization beam splitter 111 and 1/2 wavelength plate 113, P-polarized light coming through the polarization beam splitter 111 L ^P and 1 / The optical path of the P-polarized light LP ^* converted by the two-wavelength plate 113 is changed, and the P-polarized light LP ^* intersects at a point P ⁰ on the incident side surface of the liquid crystal light valve 117 to become a combined light.

Therefore, in this image projection apparatus, the S-polarized lights L ^S and P S separated by the polarization beam splitter 111 are
Since both of the polarized light L ^P can be illuminated liquid crystal light valve 117, it is possible to double the utilization efficiency of light than the image projection apparatus shown in FIGS. 12 and 13.

[0010]

[0006] However, the image projection apparatus Sho 61-90584 JP described above, P-polarized light L ^P and the converted P-polarized light L ^P in the half-wave plate 113 ^* Are incident on the liquid crystal light valve 117 at an angle θ shown in FIG. 14, so that when the liquid crystal light valve 117 whose characteristic is greatly degraded by the incident angle is used, the distance between the wedge-shaped lenses 114 and 115 to the liquid crystal light valve 117 is increased. There is a disadvantage in that it is necessary to take a considerably large distance and reduce the incident angle.

As a method of solving this disadvantage, FIG.
Of removing the wedge-shaped lenses 114 and 115, considered parallel lighting system to be incident on P-polarized light L ^P and P-polarized light L ^{P *} remains and a parallel liquid crystal light valve 117 is converted by the half wave plate 113 Can be However, even if this parallel illumination method is applied to the image projection apparatus described in Japanese Patent Application Laid-Open No. 61-90584, unless the light source 111 is a perfect point light source or a linear light source, the unpolarized parallel light emitted from the condenser lens 104 Are not perfect, the two P-polarized components L ^P ,
LP ^* also does not become completely parallel. This is shown in FIG.
5 will be described.

Non-polarized light emitted from a light source 101 having a finite diameter φ is focused by a condenser lens 104 arranged at a distance L, but the light emitted from the condenser lens 104 is not perfectly parallel light. Angle 2ω (ω = tan ^-1
Non-parallel light having a spread in the range of {(φ / 2) / L}. The ray α of the non-parallel light is incident on the half-wave plate 113 without being affected by the polarizing beam splitter 111, and therefore, both the S-polarized light and the P-polarized light are contained from the half-wave plate 113. Emit. The light beam β is converted into S-polarized light L ^S by the polarizing beam splitter 111,
After being reflected by 112, is reflected by the polarization beam splitter 111 again, either from a completely different position as indicated by rays beta ¹ emitted from P-polarized light L ^{P *} as a half-wave plate 113, FIG. 1
As shown by the ray β ² in FIG. 5, the light is absorbed at the interface of the half-wave plate 113 or transmitted as it is, resulting in loss light.

Therefore, the above-mentioned Japanese Patent Application Laid-Open No. 61-905 is disclosed.
The image projection device described in Japanese Patent Application Publication No. 84-84 has a problem in use in the parallel illumination system, and thus the wedge-shaped lenses 114 and 115 are indispensable. However, considering the light incident angle characteristics of the liquid crystal light valve 117, FIG. The angle θ shown in the figure cannot be made too large, and the wedge-shaped lenses 114 and 115 and the liquid crystal light valve
The distance from the light source to the light source 10 cannot be reduced because the distance from the light source to the light source cannot be reduced by a certain value or more.
There is a drawback in that the illumination efficiency (light utilization rate) is reduced with an increase in the distance between 1 and the liquid crystal light valve 117.

The image projection apparatus described in Japanese Patent Application Laid-Open No. 61-90584 has a polarizing beam splitter 111.
1 and a total reflection prism 112 are required.
There is a disadvantage that the entire device becomes larger than that shown in FIG.

An object of the present invention is to provide an image projection apparatus which can make a polarization conversion system compact.

[0016]

According to a first aspect of the present invention, there is provided an image projection apparatus comprising: means for supplying polarized light; forming means for forming image light with the polarized light; and projecting means for projecting the image light. A supply unit configured to divide the non-polarized light from the light source into a plurality of light beams; a polarization separation unit configured to separate each of the plurality of light beams into a P-polarized light and an S-polarized light; Means for translating the plurality of S-polarized lights, polarizing means for matching the polarization directions of the plurality of P-polarized lights and the plurality of S-polarized lights, the plurality of P-polarized lights whose polarization directions match each other, and the plurality of An optical system for irradiating the s-polarized light onto the forming unit and condensing the s-polarized light on a pupil of the projecting unit is provided.

According to a second aspect of the present invention, there is provided an image projection apparatus comprising: means for supplying polarized light; forming means for forming image light with the polarized light; and projecting means for projecting the image light. A liquid crystal element, and a polarizing plate provided on the light emission side of the liquid crystal element separately from the liquid crystal element;
Splitting means for splitting unpolarized light from the light source into a plurality of light fluxes,
Polarization separating means for separating each of the plurality of light beams into P-polarized light and S-polarized light, means for translating the plurality of P-polarized lights and the plurality of S-polarized lights, the plurality of P-polarized lights and the plurality of S-polarized lights It is characterized by comprising a polarizing means for matching the polarization directions of the polarized lights, and an optical system for irradiating the plurality of P-polarized lights and the plurality of S-polarized lights whose polarization directions match each other onto the forming means.

In the image projection apparatus according to a second aspect of the present invention, the optical system includes the plurality of Ps whose polarization directions match each other.
The polarized light and the plurality of S-polarized lights may be focused on the pupil of the projection unit.

[0019] In any of the above image projection devices,
The dividing means may include a fly-eye lens or a lenticular lens.

The supply means has a plurality of dichroic mirrors for obtaining the three colors of R, G, B polarized light, and the forming means has the three colors of R, G, B polarized light. And three liquid crystal display devices that form R, G, and B three-color image lights, and the projecting unit is configured to combine and project the R, G, and B three-color image lights. Is also good.

In the above case, the supply means includes a plurality of the P-polarized lights whose polarization directions are identical to each other for each color light from the three non-polarized lights of R, G, and B obtained by the plurality of dichroic mirrors. Light and the plurality of S-polarized lights may be configured.

[0022]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a structural view of a plate-shaped polarizing element unit 20 showing a first embodiment of a plate-shaped polarizing element used in the image forming apparatus of the present invention.

[0024] Unit 20 of the plate-like polarizing element of the present embodiment includes a first incident-side prism 21 ¹ in cross-section having a triangular prism of a right triangle, the slope to each other in a first incidence side prism 21 ¹ on both sides ordered by contacting ^one first and second exit-side prism 22 has a first incident-side prism 21 ¹ and the same shape, 22 ^2, first the first incident side of the exit-side prism 22 ¹ prisms 21 ¹ and aligned by contacting the slope with each other on the opposite side, a second incident side prism ²¹² having a first incident-side prism 21 ¹ half shape, the second
The first and the incident-side prism 21 ¹ are arranged by contacting the slope with each other on the opposite side, a third incident side prism 21 ³ having a second incident-side prism 21 ² the same shape of the exit-side prism 22 ² And three incident-side prisms 21 ¹ to 21
21 ³ and ¹ two exit-side prism 22, 22 ² and constitute a single parallel plate together. The first incident-side prism 21 ¹ and the contact surface with the first exit-side prism 22 ^1, the first 1 to the first incident-side prism 21 ¹ side /
4 wave plate 23 ¹ is provided, the first polarization separation acting film 24 ¹ is provided on the first exit-side prism 22 ¹ side. Furthermore, the first incidence side prism ²¹¹ and the contact surface with the second exit-side prism 22 ^2, the second quarter-wave plate 23 ² is provided in the first incidence side prism ²¹¹ side cage, the second polarization separation acting film 24 ² is provided on the second outgoing-side prism 22 ² side. Second incident side prism 2
1 ² and to the first contact surface with the exit-side prism 22 ^1, the first
Are total reflection mirror 25 ¹ is formed, and the third incidence side prism 21 ³ The contact surface with the second exit-side prism 22 ^2, the second total reflection mirror 25 ² are formed. Here, the first and second polarization separation films 24 ¹ , 24
No. ² has the property of reflecting S-polarized light having a plane of polarization parallel to the film plane and transmitting P-polarized light having a plane of polarization perpendicular to the film plane. The first and second quarter-wave plate 23 ^1, 23 ^2, first and second incident light P ^1, P ²
And acts on light incident at an incident angle of 45 °, and its axial direction is selected so as to convert S-polarized light into circularly polarized light.

[0025] That is, the plate-like polarizing unit of the element 20 of the present embodiment, the first incidence side prism 21 ¹ and the first and the exit-side prism 22 ^first contact surface and the first incidence side prism ²¹¹ and the contact surface between the exit-side prism 22 ² 2 while the reflected light from the (first and has a slope of approximately the same angle with respect to non-polarized light (first and second incident light P ^1, P ²⁾ the second S-polarized light L ^S1, L ^S2) acts as a pair of divided surfaces facing each other so that toward the other, the first and second polarization separation acting film 24 ^1, 24 ^2, the plane of polarization of the incident light to each other Are orthogonally reflected light (first and second S-polarized light L ^S1 ,
L ^S2 ) and transmitted light (first and second P-polarized light L ^P1 ,
L ^P2 ). In addition, the first and second total reflection mirrors 25 ¹ and 25 ² make one of the reflected light and the transmitted light (the first and second S-polarized lights L ^S1 and L ^S2 ).
And the other (first and second P-polarized light L ^P1 ,
L ^P2 ) functions as a reflecting portion that is directed in substantially the same direction as the traveling direction. Further, the first and second quarter-wave plates 23
^1, at least one of 23 ² reflected and transmitted light (first
And the second S-polarized light L ^S1 , L ^S2 ) functions as a modulator for changing the plane of polarization of the light and changing the planes of polarization of both.

Next, the unit 20 of the plate-like polarizing element of this embodiment is
Will be described.

First incident side prism 21¹And the first emission
Side prism 22¹45 ° incident angle to the contact surface with
First incident light P having a random plane of polarization to be incident¹
Is the first quarter-wave plate 23¹After passing through the first
Light separation action film 24¹Incident on and polarized perpendicular to the film plane
First P-polarized light L having a surface^P1Is the first polarization separating film
24¹Having a polarization plane parallel to the film plane.
1 S-polarized light L^S1Is the first polarization separating film 24¹On the right
To the first P-polarized light L^{P 1}When
First S-polarized light L^S1And divided into First P-polarized light L
^P1Is the first exit side prism 22¹Exit from the exit surface of
You. On the other hand, the first S-polarized light L^S1Is the first quarter-wave plate
23¹After being converted into circularly polarized light by transmitting
Second quarter wave plate 23^TwoThrough the second
Polarized light separating film 24^TwoPolarization plane perpendicular to the film surface
Converted first P-polarized light L^{P1 *}Is converted to No.
1 converted P-polarized light L^{P1 *}Is the second polarization separating film
24^TwoAfter passing through the second total reflection mirror 25.^TwoAt the top
Is reflected at right angles to the second exit side prism 22^TwoOut of
First P-polarized light L from launch surface^P1Out in the same direction as
Shoot.

[0028] The first incident side prism 21 ¹ and the second
The second incident light P ² having a random polarization plane, which is incident at an incident angle of 45 ° with respect to the contact surface with the exit side prism 22 ² , has transmitted through the second quarter-wave plate 23 ² . After the second
Polarization separation acting film 24 ² is incident, a second P-polarized light L ^P2 is transmitted through the second polarization separation acting film 24 ² having a polarization plane perpendicular to the film plane, parallel to the film surface by the second S-polarized light L ^S2 having a plane of polarization is reflected at a right angle to the left in the second polarization separation acting film 24 ^2, the second P-polarized light L ^P2
And the second S-polarized light L ^S2 . The second P-polarized light L ^P2 emitted from the second emission surface of the exit-side prism 22 ^2. On the other hand, the second S-polarized light L ^S2 is converted into circularly polarized light by transmitting through the ^second quarter-wave plate 232,
First conversion first polarization separation acting film 24 ¹ of the second having a polarization plane perpendicular to the film surface of the transformed P-polarized light L ^{P2 *} by passing through the quarter-wave plate 23 ¹ Is done. After ^* second transformed P-polarized light L ^P2 is transmitted through the first polarization separation acting film 24 ^1, it is reflected at a right angle upwardly at the first total reflection mirror 25 ^1, first exit-side prism 22 is emitted from the ^first emission surface in the same direction as the traveling direction of the second P-polarized light L ^P2.

Accordingly, the plate-like polarizing element of this embodiment is simply
The position 20 is a first incident side prism 21¹First incident on
And the second incident light P¹, P^TwoTo the first and second P-polarized light
Light L^{P 1}, L^P2And the first and second converted P-polarized light L
^{P1 *}, L^{P2 *}And output from the entire exit surface
Can be done.

Next, the unit 20 of the plate-like polarizing element of this embodiment is
The material of each component will be described.

First, second, and third entrance-side prisms 2
1¹~ 21^ThreeAnd first and second exit-side prisms 22
¹, 22^TwoConsists of glass or plastic etc.
The first and second polarization splitting films 24
¹, 24^TwoIn order to keep the separation function of
It is better to use a glass with a high degree of freedom. Also,
It is also possible to combine parallel plates without using rhythm
In this case, the transmittance of P-polarized light
Less than when using a program. 1st and 2nd quarter wave
Long plate 23¹, 23^TwoIs crystalline, such as mica or quartz,
Stretched polymer film, constant thickness, constant direction
-Molecule liquid crystal and side-chain polymer oriented with their molecular axes aligned
It is composed of liquid crystal or low-molecular liquid crystal dispersed in a polymer.
Can be achieved. First and second polarization splitting action films
24¹, 24^TwoCan be composed of a known optical multilayer film. First
And second total reflection mirror 25¹, 25^TwoIs aluminum deposition
Mirrors may be used, and second and third entrance side pre-
Zum 21^Two, 21^ThreeRemoving the first and second exit sides
Prism 22¹, 22^TwoFirst incident side prism 22 ¹When
The opposite slope may be the air boundary.

One example of a configuration in which a plurality of units 20 shown in FIG. 1 are arranged to form a plate-like polarizing element is a plate-like polarizing element 4 in which a plurality of units 20 are arranged in a horizontal direction as shown in FIG.
There is one. Further, as another configuration example, as shown in FIG. 3, a plate-shaped polarizing element 41a formed by arranging a plurality of rows in which a plurality of units 20 are arranged in a horizontal direction and arranging a plurality of rows by shifting a pitch by half between adjacent rows. is there. In the plate-like polarizing elements 41 and 41a shown in FIGS. 2 and 3, the entrance-side prism (FIG.
The second incident side prism 21 ² and the third incident side prism 21 ³ ) shown in FIG.

FIG. 4 is a structural view of a plate-like polarizing element unit 20a showing a second embodiment of the plate-like polarizing element used in the image forming apparatus of the present invention.

The point that the unit 20a of the plate-like polarizing element of this embodiment is different from the unit 20 of the plate-like polarizing element shown in FIG.
And a second quarter-wave plate 23 ^1, 23 ² instead, 1
/ 2 wavelength plate 26 of the contact surface between the first incident-side prism 21 ¹ and the contact surface and the first incidence side prism ²¹¹ and the second exit-side prism 22 ² of the first exit-side prism 22 ¹ It is provided in the middle.

In the unit 20a of the plate-like polarizing element of this embodiment,
Is the first incident light P¹Is the first P-polarized light L^P1Is the first
Polarized light separating film 24¹Through the first S-polarized light L^S1But
First polarization separation film 24¹Is reflected at right angles to the right
Thus, the first P-polarized light L^{P 1}And the first S-polarized light L^S1
And divided into First P-polarized light L^P1Is the first exit side
Rhythm 22¹Out of the light exit surface. On the other hand, the first S bias
Light light L^S1Is polarized by transmitting through the half-wave plate 26.
The first converted P-polarized light L is rotated by 90 °.
^{P1 *}Is converted to First converted P-polarized light L^{P1 *}Is the
2 polarization separation film 24^TwoAfter passing through the second counter
Shooting mirror 25^TwoIs reflected upward at a right angle to the second exit
Side prism 22^TwoFrom the exit surface of the first P-polarized light L^P1Progress
Light is emitted in the same direction as the row direction. Further, the second incident light P^Two
Is the second P-polarized light L^P2Is the second polarization separation film 24^Two
And the second S-polarized light L^S2Is the second polarization separating film
24^TwoAt right angles to the second P
Polarized light L^P2And the second S-polarized light L^S2And divided into Second
P-polarized light L^P2Is the second exit-side prism 22^TwoExit surface of
Emitted from On the other hand, the second S-polarized light L^S2Is a 1/2 wave
By passing through the long plate 26, the polarization plane is rotated by 90 °.
And the second converted P-polarized light L^{P2 *}Is converted to Second
Converted P-polarized light L^{P2 *}Is the first polarization separation film 2
4¹Through the first total reflection mirror 25¹Up at
The first exit-side prism 22 is reflected at a right angle.¹Outgoing
From the surface, the second P-polarized light L^P2Emitted in the same direction as
I do. Therefore, the unit 20 of the plate-like polarizing element of this embodiment is
a is also the first incident side prism 21¹First incident on
And the second incident light P¹, P^TwoTo the first and second P-polarized light
Light L^P1, L ^P2And the first and second converted P-polarized light L
^{P1 *}, L^{P2 *}And output from the entire exit surface
Can be done. The half-wave plate 26 is the first
Incident side prism 21¹And the first exit side prism 22¹When
Contact surface and first incident side prism 21¹And the second out
Launch side prism 22^TwoAnywhere between the contact surfaces
You may be.

FIG. 5 is a structural view of a plate-shaped polarizing element unit 30 showing a third embodiment of the plate-shaped polarizing element used in the image forming apparatus of the present invention.

In the unit 30 of the plate-like polarizing element of the present embodiment, the dividing portion (polarization separating film 34) is inclined with respect to the unpolarized light (incident light P) and the reflecting portion (total reflection film 35) is formed. arranged parallel to the division unit, the optical path of the half-wave plate 36 is reflected as a modulation unit (S-polarized light L ^S), in particular, light reflecting portion (total reflection film 3
It is arranged on the optical path of the reflected light (S-polarized light L ^S ) reflected at 5).

That is, the unit 30 of the plate-shaped polarizing element of this embodiment is composed of a first glass member 31 having a parallelogram cross section.
^{The first} and second glass members 31 ¹ are arranged on both sides of the first glass member 31 ¹ with their slopes in contact with each other.
Of the glass member 31 ^2, made of 31 ³ which, three glass members 31 ¹ to 31 ³ constitute a single parallel plate together. Further, a total reflection film 35 is provided on the contact surface between the ^first glass member 31 ¹ and the second glass member 31 ^2, and the first glass member 31 ¹ and the third glass member 31 ³
The polarization separation film 34 is provided on the contact surface with the substrate. Further, the half-wave plate 36 is provided on the emission surface (the surface opposite to the surface on which the incident light P is incident) of the first glass member 31 ^1.
Is provided. Here, the polarization separation film 34 has a characteristic of reflecting S-polarized light having a polarization plane parallel to the film plane and transmitting P-polarized light having a polarization plane perpendicular to the film plane. The half-wave plate 36 acts on light incident at an incident angle of 90 °. Therefore, in the unit 30 of the plate-like polarizing element of the present embodiment, the polarization separating film 34 converts the incident light into reflected light (S-polarized light L ^S ) and transmitted light (P-polarized light L ^P ) whose polarization planes are orthogonal to each other. It functions as a dividing unit for dividing into. In addition, the total reflection film 35 functions as a reflection unit that reflects one of the reflected light and the transmitted light (S-polarized light L ^S ) and directs the reflected light and the transmitted light in the same direction as the traveling direction of the other (P-polarized light L ^P ). Further, the half-wave plate 36 functions as a modulation unit that changes the polarization plane of at least one of the reflected light and the transmitted light (S-polarized light L ^S ) to match the polarization planes of both.

Next, the unit 30 of the plate-like polarizing element of this embodiment is described.
Will be described.

The incident light P having a random plane of polarization, which is incident on the film surface of the polarization separation film 34 at an incident angle of 45 °, becomes a P-polarized light L ^P having a plane of polarization perpendicular to the film surface.
By There which is transmitted through the polarization separation action film 34, S-polarized light L ^S having a plane of polarization parallel to the film surface is reflected at a right angle to the left by the polarization separation action film 34, and the P-polarized light L ^P It is split into S-polarized light L ^S. P-polarized light L ^P is the exit surface of the third glass member 31 ³ (surface opposite to the surface where the incident light P is incident)
Emitted from On the other hand, the S-polarized light L ^S is reflected upward at a right angle by the total reflection film 35, and is emitted from the emission surface of the ^second glass member 312 in the same direction as the traveling direction of the P-polarized light L ^P. By transmitting through the wave plate 36, the polarization plane becomes 9
The light is rotated by 0 ° and converted into P-polarized light LP ^* . Thus, the unit 30 of the plate-like polarizing element of the present embodiment, without loss converts incident light P incident on the first glass member 31 ¹ to the P-polarized light L ^P and the converted P-polarized light L ^{P *} Thus, light can be emitted from the entire emission surface.

As an example of a configuration in which a plurality of units 30 shown in FIG. 5 are arranged to form a plate-like polarizing element, the unit 2 shown in FIG.
Similarly to FIG. 0, there are configuration examples shown in FIGS. Here, since the unit 30 shown in FIG. 5 can be configured by arranging a plurality of parallelogram glass members when forming a plate-like polarizing element, the unit 30 is more excellent in workability than the unit 20 shown in FIG. There is an effect that there is. That is, the unit 20 is composed of a glass plate provided with a polarization separation film 34 on one side and a total reflection film 35.
(For example, an aluminum vapor-deposited film) is alternately laminated with a glass plate provided on one side, cut at a cross section of 45 °, and the cut surface is optically polished. Can be created.

FIG. 6 is a structural view of a plate-like polarizing element unit 30a showing a fourth embodiment of the plate-like polarizing element used in the image forming apparatus of the present invention.

The difference between the unit 30a of the plate-like polarizing element of this embodiment and the unit 30 of the plate-like polarizing element shown in FIG.
The two-wavelength plate 36 is disposed between the polarization separation film 34 (divided portion) and the total reflection film 35 (reflected portion).

[0044] In the unit 30a of the plate-like polarizing element of the present embodiment, the incident light P is, P-polarized light L ^P passes through the polarization separation action film 34, S-polarized light L ^S is left on the polarization splitting action film 34 At right angles to the P-polarized light L ^P and the S-polarized light L ^S
And divided into P-polarized light L ^P is the third glass member 31 ³
Out of the light exit surface. On the other hand, the S-polarized light L ^S is transmitted through the half-wave plate 36, the polarization plane is rotated by 90 °, converted into P-polarized light L ^{P *} , and then reflected upward by the total reflection film 35 at right angles. , emitted from the second emission surface of the glass member 31 ² in the same direction as the traveling direction of the P-polarized light L ^P. Therefore, the unit 30a of the plate-shaped polarizing element of this embodiment is the first unit.
Incident light P incident on the glass member 31 ¹ is converted without loss into a P-polarized light L ^P and the converted P-polarized light L ^{P *,} can be emitted from the exit surface entire.

FIG. 7 is a structural view of a plate-like polarizing element unit 30b showing a fifth embodiment of the plate-like polarizing element used in the image forming apparatus of the present invention.

The point that the unit 30b of the plate-like polarizing element of this embodiment is different from the unit 30 of the plate-like polarizing element shown in FIG.
It is that the half-wave plate 36 is bonded to the third emission surface of the glass member 31 ³ of an optical path of the transmitted light (P-polarized light L ^P).

In the unit 30b of the plate-like polarizing element of this embodiment,
Is the incident light P is the P-polarized light L^PChanges the polarization separation film 34
Transmitted, S-polarized light L^SIs directly to the left by the polarization separation film 34.
The P-polarized light L^PAnd S-polarized light L^S
And divided into P-polarized light L^PIs the third glass member 31^Three
After exiting from the exit surface, the light passes through the half-wave plate 36.
As a result, the plane of polarization is rotated by 90 ° and the S-polarized light L^{S *}To
It is converted and emitted. On the other hand, S-polarized light L^SIs the total reflection film 3
5, the light is reflected upward at a right angle, and the second glass member 31^Twoof
The converted S-polarized light L from the exit surface^SSame direction of travel
Emit in the same direction. Therefore, the plate-shaped polarizer of this embodiment
The child unit 30b is the first glass member 31 ¹Incident on
Incident light P is converted to S-polarized light L^SAnd the converted S-polarized light L^{S *}
And output from the entire exit surface
Can be.

FIG. 8 is a perspective view showing a part of the first embodiment of the polarization conversion unit used in the image forming apparatus of the present invention.

The polarization conversion unit 40 of this embodiment is similar to that of FIG.
And the incidence of the plate-like polarizing element 41
To the non-polarized light of the fence pattern
Double-sided lenticular lens 42 as conversion means for conversion
Consists of Here, the plate-shaped polarizing element 41 is a double-sided wrench.
Non-polarized light with a fence pattern emitted from the lens 42
It is arranged almost perpendicular to the optical axis of light, and is a fence-shaped putter.
And converts the unpolarized light into nearly dense polarized light.
You. In addition, as shown in FIG.
Incident light P¹~ P^Three(Unpolarized light) incident surface
Is the incident light P¹~ P^ThreePositive power that has the function of focusing
Focusing surface 43 composed of a lens¹~ 43^ThreeIs a plate-shaped polarizer
Each unit 20 of child 41¹~ 20^ThreeProvided at the same pitch as
I have. Also, the incident light P of the double-sided lenticular lens 42
¹~ P^ThreeOf the incident light P¹~ P^ThreeTo
Is it a negative power lens that has the effect of diverging into parallel light?
Divergent surface 44¹~ 44^ThreeBut each unit is 20¹~ 20^Three
First incident side prism 21¹(See FIG. 1)
It is provided to face. Further, each diverging surface 44
¹~ 44^ThreeBetween the non-working surface 45 which is a plane¹, 45^TwoBut
Is provided.

Therefore, the double-sided lenticular lens 4
By the incident light P ¹ to P ³ coming incident perpendicularly to the plane of incidence of 2 which is focused by the focusing action surface 43 ^{1-43 3,} as shown in FIG. 9, the nonoperating surface 45 ^1, 45 ² After incident only on diverging effect surface 44 ^{1-44 3} without entering the diverging effect surface 44 ¹
To emitted collimated light to 44 ^3, the light emitted from both the lenticular lens 42 becomes non-polarized light of palisade pattern. After this unpolarized light palisade pattern is converted by the plate-like polarizing element 41 to the polarized light, the unit 20 ¹ to 20 ³
Are emitted from the entire exit surface. The diverging surface 44 ¹
To 44 the absolute value focusing action face of the ^third focal length 43 ^{1-43 3}
With half of the focal length of the can to the light flux width of the unpolarized light palisade pattern emitted from both lenticular lens 42 by half the pitch of the focusing action surface 43 ^{1-43 3.} Further, by providing the absorbing layer on the non-working surface 45 ^1, 45 ^2, it is possible to reduce an adverse effect due to irregular reflection.

The polarization conversion unit 40 of this embodiment has the following advantages.

[0052] (1) in order to enter the respective unit 20 ¹ to 20 ³ of the double-sided lenticular lens 42 incident light P ¹ to P ³ is converted into unpolarized light palisade pattern plate polarizing element 41,
The size of the unit 20 ¹ to 20 ³ can be reduced. Further, in order to further reduce the size of the unit 20 ¹ to 20 ³ of the plate-like polarizing element 41, the division number of palisade pattern by reducing the pitch of the focusing action surface 43 ^{1-43 3-sided} lenticular lens 42 Should be increased.

(2) Even if the light source has a finite diameter, the incident light P ^{1 to} P ³ is
20 ¹ to 20 ³ first and second polarization separation acting film 24 ^1, 4
5 ² Always for entering the can improve the degree of polarization of the disadvantages can be eliminated, the light use efficiency and the emitted light in the conventional image projection apparatus shown in FIG. 14. In particular, the first and second polarization separation acting film 24 ^1, 24 ^2, because it is relatively easy to reflectance for S-polarized light to 100%, can be kept high degree of polarization of the emitted light .

[0054] (3) Each unit of the plate-like polarizing element 41 20 ¹ -
20 ³ components, first, second and third incident-side prism 21 ¹ to 21 ³ and the first and second exit-side prism 22 ^1, 22 ^2, the shape and size the same Therefore, the number of types of parts can be reduced in manufacturing, and cost reduction can be achieved. In particular, since the types of prisms that account for a large proportion in cost can be reduced, the effect of cost reduction is very large.

As the double-sided lenticular lens 42, an extruded acrylic plate or a compression-molded acrylic plate can be used in consideration of optical characteristics such as ease of moldability and transmittance. However, when heat resistance is particularly required, a compression-molded or polished-molded glass member is preferable.
Further, the double-sided lenticular lens 42 may be formed by integral molding, or may be formed by bonding a single-sided lenticular lens. Further, when the light source has a finite size, by the absolute value of the focal length of the diverging function surface 44 ^{1-44 3} and less than half of the focal length of the focusing action surface 43 ^{1-43 3,} palisade pattern The ratio between the light flux existing area and the light non-existent area of the non-polarized light can be set to 1: 1.

The polarization conversion unit 40 of this embodiment is similar to that of FIG.
Is constructed using the plate-shaped polarizing element 41 and the double-sided lenticular lens 42 shown in FIG. 4, but the plate-shaped polarizing element composed of the units 20a, 30, 30a, and 30b and the double-sided lenticular lens shown in FIGS. You may comprise using it.

Next, a description will be given of a second embodiment of the polarization conversion unit used in the image forming apparatus according to the present invention.

The polarization conversion unit of the present embodiment converts the plate-shaped polarizing element 41a shown in FIG. 3 and the non-polarized light provided on the incident side of the plate-shaped polarizing element 41a into non-polarized light having a lattice pattern. And a double-sided fly-eye lens as a conversion means. In the polarization conversion unit of the present embodiment, after dividing the incident light in the vertical and horizontal directions in both fly-eye lens, the first incident-side prism 21 ¹ of each unit 20 ¹ to 20 ⁵ of the plate-like polarizing element 41a Make it incident. In this embodiment, the units 20a, 30 and 30 shown in FIGS.
It may be configured using a plate-shaped polarizing element composed of 30a and 30b and a double-sided fly-eye lens.

FIG. 10 is a schematic configuration diagram showing a first embodiment of the image projection apparatus of the present invention.

The image projection apparatus of this embodiment includes a polarization conversion unit 40 shown in FIG. 8 as an illumination optical system for converting parallel white light (unpolarized light) from the first condenser lens 64 into white linearly polarized light. It differs from the image projection device shown in FIG. 14 in that it is used. In the image projection apparatus of the present embodiment, a second condenser for condensing white linearly polarized light from the polarization conversion unit 40 into the pupil of the projection lens 68 between the polarization conversion unit 40 and the liquid crystal light valve 66. A lens 65 is provided.

Therefore, the image projection apparatus of this embodiment is
Polarization conversion unit 40 which is the polarization conversion unit of the present invention
The light source 6 is used to illuminate the liquid crystal light valve 66 using
The white light (non-polarized light) emitted from No. 1 can be made incident on the liquid crystal light valve 66 without loss, and the distance from the light source 61 to the liquid crystal light valve 66 can be shortened. Can be achieved.

FIG. 11 is a schematic configuration diagram showing a second embodiment of the image projection apparatus of the present invention.

The image projection apparatus according to this embodiment includes a light source 71 that emits unpolarized light (white light), a reflection mirror 72, a heat ray cut filter 73, a first condenser lens 74,
The illumination optical system includes an illumination optical system that converts non-polarized light from the light source 71 into polarized light, an image generation unit that generates an image by modulating the polarized light according to a video signal, and a projection optical system that projects an image. Here, the illumination optical system decomposes white light, which is non-polarized light, into non-polarized light of each color of red, green, and blue, a first dichroic mirror 81 for decomposition, a second dichroic mirror 82 for decomposition and a decomposition Conversion units 40 ^R , 40 ^G , and 40 ^{B each} having a configuration similar to that of the polarization conversion unit 40 shown in FIG. When,
Red condenser lens 75 ^R , green condenser lens 7
It is composed of a 5 ^G and blue condenser lens 75 ^B. Further, the image generating unit is provided with three liquid crystal light valves 76 ^R , a green liquid crystal light valve 76 ^G and a blue liquid crystal light valve 76 ^B , which are three generators for generating images of red, green and blue, respectively. Become. Further, the projection optical system includes:
A first combining dichroic mirror 84, a combining reflecting mirror 85, and a second combining dichroic mirror 86;
And a projection lens 78.

[0064] In the image projection apparatus of this embodiment, cyan red unpolarized light P ^R is reflected at a right angle upwardly at a first decomposition dichroic mirror 81, also passing through the first decomposing dichroic mirrors 81 Out of the non-polarized light P ^G + P ^B , the blue non-polarized light P ^B passes through the second decomposing dichroic mirror 82, and the green non-polarized light P ^G is perpendicularly upward by the second decomposing dichroic mirror 82. The parallel white light P ^R + P ^G + P ^B , which is unpolarized light, emitted from the first condenser lens 74 by being reflected by
The light is decomposed into unpolarized light P ^R , P ^G , and P ^B of each color of green and blue.
Incidentally, after the unpolarized light P ^R of the red which is reflected at a right angle to the left in an exploded reflecting mirror 83, the red polarized light converting unit 40
It enters ^R and is converted into red polarized light. The green unpolarized light ^PG is supplied to a second dichroic mirror 8 for decomposition.
After being reflected by 2, and enters the green polarization conversion unit 40 ^G, it is converted into green polarized light. Further, the blue unpolarized light P ^B is supplied to the second decomposing dichroic mirror 82.
After passing through the incident on the blue polarization conversion unit 40 ^B, it is converted into blue polarized light.

The red polarized light is supplied to the red condenser lens 7.
5 ^R is incident on the liquid crystal light valve 76 ^R for red,
Polarization plane in response to the red component of the color video signal is modulated by being rotated, P polarized light and becomes a light beam including both S-polarized light, yet the red image light R of the linearly polarized light by the red polarizing plate 77 ^R Converted to ^* . Similarly,
Green polarized light by the action of the green liquid crystal light valve 76 ^G and green polarizing plate 77 ^G, is converted into green image light G ^* modulated in accordance with the green component of the color video signal,
The blue polarized light, the liquid crystal light valve 76 ^B for blue
And by the action of the blue polarizing plate 77 ^B, it is converted into blue image light B ^* modulated in accordance with the blue component of the color video signal.

The red image light R ^* and the green image light G ^* are
After being synthesized by the synthesizing dichroic mirror 84 and converted into yellow image light R ^* + G ^* , the light enters a second synthesizing dichroic mirror 86. In addition, blue image light B
^* Is reflected upward at a right angle by the reflection mirror 85 for synthesis, and then enters the second dichroic mirror 86 for synthesis. Then, the yellow image light R ^* + G ^* passes through the second synthesizing dichroic mirror 86, and the blue image light B ^* is reflected to the left by the second synthesizing dichroic mirror 86 at a right angle to the yellow image light R ^* + G ^* . Light R ^* + G ^* and blue image light B ^*
Are combined and converted into white image light R ^* + G ^* + B ^* modulated according to the color video signal. White image light R ^*
+ G ^* + B ^* is enlarged and projected on a screen (not shown) by the projection lens 78, and a color image is projected on the screen.

The image projection apparatus of this embodiment has the following effects by having a polarization conversion unit for each of the non-polarized lights P ^R , P ^G , and P ^{B of} red, green, and blue.

(1) The polarization conversion unit 40 ^R for red, the polarization conversion unit 40 ^G for green, and the polarization conversion unit 4 for blue
0 quarter-wave plate and polarization separation acting film used in each unit of ^B since it is difficult to zero the wavelength dependence of the (see FIG. 1), non-polarized light in which parallel white light P ^R + P ^G +
Than the P ^B and the incident light, red, green, non-polarized light P ^R of the respective colors of blue, P ^G, improved who was a P ^B incident light utilization efficiency of light attained.

(2) Since the light source 71 generally has a finite diameter, the white light emitted from the light source 71 always has a finite divergent angle. When the beam diameter of light having a finite divergence angle is compressed by some optical system, the divergence angle increases in inverse proportion to the compression ratio of the beam diameter. Therefore, in the conventional image projection apparatus shown in FIG. 14, since the distance between the polarization conversion unit and the liquid crystal light valve 117 is large, even if the beam diameter of light having a finite divergence angle is compressed, the divergence angle of the light is reduced. Due to the increase, the light collection efficiency to the liquid crystal light valve 117 decreases. On the other hand, in the image projection apparatus of the present embodiment, since the polarization conversion unit having a thin flat plate shape is used, the polarization conversion unit can be installed close to the liquid crystal light valve. P ^R, prevent the deterioration of the collection efficiency of the P ^G, a liquid crystal light valve 117 by increasing the divergence angle of the P ^B.

Next, a description will be given of a third embodiment of the image projection apparatus according to the present invention.

[0071] An image projection apparatus of this embodiment, in place of the green polarization conversion unit 40 ^G and blue polarization conversion unit 40 ^B, the first decomposition dichroic mirror 81 of the second decomposition dichroic mirror 82 while the point having a cyan polarization conversion unit provided in (green unpolarized light P ^G and blue unpolarized light P ^B and the common optical path of) different from the image projection apparatus shown in FIG. 11.

When a plurality of polarization conversion units are used, each of the polarization conversion units is located at an optically equivalent position (light traveling direction and amplitude) from the viewpoint of utilization efficiency of light emitted from the light source and suppression of color unevenness. It is preferable to arrange the image projection apparatus as shown in FIG. 11 since it is better to arrange them at the same position. However, when priority is given to reduction of the number of parts, the image of this embodiment is used. Even if it is configured like a projection device and the number of polarization conversion units is reduced, the light use efficiency can be improved as compared with the conventional image projection device, and the entire device can be made compact.

In the image projection device shown in FIG.
And the polarization conversion unit 40 for each color. ^R, 40^G, 40^BWhen
Then, the units 20a, 30, 30a, shown in FIGS.
Plate-shaped polarizing element composed of 30b and double-sided lenticular ren
And the plate shown in FIG.
-Shaped polarizing element 41a combined with a double-sided fly-eye lens
It is also possible to use one having a configuration in which it is provided. Further, the image projection of the present invention is performed.
The configuration of the shooting device is limited to the configuration shown in FIG.
However, for example, see Japanese Patent Application Laid-Open No. 62-59919.
As described above, the white light is separated into each color light using each color filter,
Cube prism for each color light modulated by liquid crystal light valve
For each color filter in an image projection device that synthesizes
The polarization conversion unit 40 shown in FIG.
No. Further, as disclosed in Japanese Patent Application Laid-Open No. 62-1391,
The white light is separated into each color light by the cube prism of
Each color light modulated by the liquid crystal light valve is converted to a second cube.
In an image projection apparatus that combines images using a prism,
The polarization conversion shown in FIG.
The unit 40 may be arranged.

[0074]

As described above, according to the present invention,
In a compact system, non-polarized light emitted from a light source can be converted into polarized light to improve light use efficiency.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a plate-shaped polarizing element unit 20 showing a first embodiment of a plate-shaped polarizing element used in the image projection apparatus of the present invention.

FIG. 2 is a partial view showing an example of a configuration in which a plurality of units 20 shown in FIG. 1 are arranged to form a plate-shaped polarizing element.

FIG. 3 is a partial view showing another configuration example in which a plurality of units 20 shown in FIG. 1 are arranged to form a plate-shaped polarizing element.

FIG. 4 is a configuration diagram of a plate-shaped polarizing element unit 20a showing a second embodiment of the plate-shaped polarizing element used in the image projection apparatus of the present invention.

FIG. 5 is a configuration diagram of a plate-shaped polarizing element unit 30 showing a third embodiment of the plate-shaped polarizing element used in the image projection apparatus of the present invention.

FIG. 6 is a configuration diagram of a plate-shaped polarizing element unit 30a showing a fourth embodiment of the plate-shaped polarizing element used in the image projection device of the present invention.

FIG. 7 is a configuration diagram of a plate-shaped polarizing element unit 30b showing a fifth embodiment of the plate-shaped polarizing element used in the image projection device of the present invention.

FIG. 8 is a perspective view showing a part of the first embodiment of the polarization conversion unit used in the image projection apparatus of the present invention.

FIG. 9 is a diagram for explaining the operation of the double-sided lenticular lens shown in FIG.

FIG. 10 is a schematic configuration diagram showing a first embodiment of the image projection apparatus of the present invention.

FIG. 11 is a schematic configuration diagram showing a second embodiment of the image projection apparatus of the present invention.

FIG. 12 is a main part configuration diagram showing an example of a conventional projection display device.

FIG. 13 is a main part configuration diagram showing another example of a conventional projection display device.

FIG. 14 is a main part configuration diagram showing a projection type display device described in JP-A-61-90584.

FIG. 15 is a diagram illustrating a problem when a parallel illumination method is applied to the projection display device of FIG. 14;

[Explanation of symbols]

^{20,20 1 ~20 5, 20a, 30,30a} , 30b
Units 21 ^{1 to} 21 ³ Incident-side prisms 22 ¹ , 22 ² Outgoing-side prisms 23 ¹ , 23 ² 1/4 wavelength plates 24 ¹ , 24 ² , 34 Polarization separating films 25 ¹ , 25 ² Total reflection mirrors 31 ^{1 to} 31 ³ Glass member 35 Total reflection film 36 1/2 wavelength plate 40 Polarization conversion unit 40 ^R red polarization conversion unit 40 ^G green polarization conversion unit 40 ^B blue polarization conversion unit 41 Plate-shaped polarizing element 42 Double-sided lenticular lens 43 ¹ to 43 ³ focusing action surface 44 ^{1-44 3} diverging working surfaces 45 ^1, 45 ² nonoperating surface 61 and 71 light sources 62, 72 reflecting mirror 63, 73 heat ray cut filter 64, 74 first condenser lens 65 second condenser lens 66 liquid crystal light valves 67 polarizer 68, 78 projection lens 75 ^R red condenser lens 75 ^G green condenser lens 75 ^B for blue con Nsarenzu 76 ^R for red liquid crystal light valve 76 ^G for green liquid crystal light valve 76 ^B for blue liquid crystal light valves 77 ^R for red polarizing plate 77 ^G for green polarizer 77 ^B for blue polarizing plate 81 first decomposition dichroic mirror 82 a Decomposition dichroic mirror 2 83 Decomposition reflection mirror 84 First synthesis dichroic mirror 85 Synthesis reflection mirror 86 Second synthesis dichroic mirror P, P ¹ , P ² , P ³ Incident light L ^P , L ^P1 , L ^P2 P-polarized light L ^S , L ^S1 , L ^S2 S-polarized light L ^{P *} , L ^{P1 *} , L ^{P2 *} converted P-polarized light L ^{S *} , L ^{S1 *} , L ^{S2 *} converted S-polarized light P ^R + P ^G + P ^B parallel white light P ^R red unpolarized light P ^G green unpolarized light P ^B blue unpolarized light R ^* red image light G ^* green image light B ^* blue image light R ^* + G ^* yellow Image light R ^* + G ^* + B ^* White image light

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Kawasaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kazumi Kimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Junko Shinkaki 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term (reference) 2H049 BA05 BA06 BA07 BA43 BB03 BB62 BB63 BC22 2H099 AA11 BA09 CA02 CA08 DA05 5C060 GA02 GB02 HC01 HC14 HC21

Claims (7)

[Claims] 1. A system comprising: means for supplying polarized light; forming means for forming image light with the polarized light; and projecting means for projecting the image light. Splitting means for splitting each of the plurality of light beams into P-polarized light and S
Polarization separating means for separating polarized light, means for translating the plurality of P-polarized lights and the plurality of S-polarized lights, polarizing means for matching the polarization directions of the plurality of P-polarized lights and the plurality of S-polarized lights, An image projection apparatus, comprising: an optical system that irradiates the plurality of P-polarized lights and the plurality of S-polarized lights whose polarization directions coincide with each other onto the forming unit and collects the light on a pupil of the projecting unit. 2. A device for supplying polarized light, a forming unit for forming image light with the polarized light, and a projecting unit for projecting the image light, the forming unit comprising: a liquid crystal element; A polarizing plate provided on the light emission side separately from the liquid crystal element, wherein the supply means divides the unpolarized light from the light source into a plurality of light fluxes, and converts each of the plurality of light fluxes into P-polarized light. Polarization separating means for separating light and s-polarized light, means for translating the plurality of p-polarized lights and the plurality of s-polarized lights, polarization for matching the polarization directions of the plurality of p-polarized lights and the plurality of s-polarized lights means,
An image projection apparatus, comprising: an optical system that irradiates the plurality of P-polarized lights and the plurality of S-polarized lights whose polarization directions coincide with each other onto the forming unit. 3. The optical system according to claim 2, wherein the optical system focuses the plurality of P-polarized lights and the plurality of S-polarized lights whose polarization directions coincide with each other on a pupil of the projection unit. Image projection device. 4. The image projection apparatus according to claim 1, wherein said dividing means has a fly-eye lens. 5. The image projection device according to claim 1, wherein the dividing unit has a lenticular lens. 6. The supply means has a plurality of dichroic mirrors for obtaining the three colors of R, G, B polarized light, and the forming means comprises the three colors of R, G, B polarized light. And three liquid crystal display devices that form R, G, and B three colors of image light, and the projection unit combines and projects the three colors of R, G, and B image lights. The image projection device according to claim 1. 7. The plurality of P-polarized lights, the polarization directions of which are the same for each color light, from the three non-polarized lights of R, G, and B obtained by the plurality of dichroic mirrors. The image projection apparatus according to claim 6, wherein the plurality of S-polarized lights are formed.