JP2003185975A - Device for projecting image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image projecting device having a compact polarization conversion system. <P>SOLUTION: This image projecting device is provided with a supplying part for supplying polarization light, a forming part for forming image light with the polarization light, and a projecting part for projecting the image light. The supplying part has a plate-like polarizing element. The unit 20 of the plate- like polarizing element comprises three incident side prisms 21<SB>1</SB>to 21<SB>3</SB>, two outgoing side prisms 22<SB>1</SB>and 22<SB>2</SB>, quarter-wavelength plates 23<SB>1</SB>and 23<SB>2</SB>and polarization separation operating films 24<SB>1</SB>and 24<SB>2</SB>provided on a contact face between the incident side prism 21<SB>1</SB>and the outgoing side prisms 22<SB>1</SB>and 22<SB>2</SB>, respectively, a total reflection mirror 25<SB>1</SB>provided on a contact face between the incident side prism 21<SB>2</SB>and the outgoing side prism 22<SB>1</SB>, and a total reflection mirror 25<SB>3</SB>provided on a contact face between the incident side prism 21<SB>3</SB>and the outgoing side prism 22<SB>2</SB>. <P>COPYRIGHT: (C)2003,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] [0001] The present invention relates to an image projection apparatus.
I do. [0002] FIG. 12 shows a conventional image projection apparatus of this type.
It is a principal part block diagram which shows one of the examples. [0003] This image projection apparatus comprises a halogen lamp,
Light that emits unpolarized light, such as a talhalide lamp
Reflects source 101 and a portion of unpolarized light emitted from light source 101
Reflective mirror 102 and a direct or reflective mirror from light source 101
Absorbs the heat rays of unpolarized light incident through
Reflected heat ray cut filter 103 and heat ray removed
Condenser lens 10 that converts unpolarized light into unpolarized parallel light
4 and a polarizer 105 that converts unpolarized parallel light into linearly polarized light
By modulating the linearly polarized light according to the video signal.
LCD light bulb, which is an image generator that generates an image
Light and linearly polarized light modulated by the liquid crystal light valve 107
Polarizing plate 108 that transmits only the component in the transmission axis direction
And the linearly polarized light transmitted through the polarizing plate 108
(Not shown) to project the image.
And a projection lens 110. FIG. 13 shows another conventional image projection apparatus of this type.
It is a principal part block diagram which shows a conventional example. [0005] This image projection apparatus uses the image projection device shown in FIG.
Instead of the two polarizers 105 and 108 of the projection device, two polarizers
The light beam splitters 106 and 109 are connected to the liquid crystal light valve 107
They are arranged before and after, respectively. The image projection apparatus shown in FIGS. 12 and 13
Of the unpolarized light emitted from the light source 101 to the polarizing plate 105
Or the linearly polarized light transmitted through the polarizing beam splitter 106.
Is used as illumination light for the liquid crystal light valve 107.
Through the polarizing plate 105 or the polarizing beam splitter 106
No linearly polarized light is lost, and the light utilization efficiency is 50% or less.
There is a drawback that it goes down. [0007] As an image projection device that has solved this disadvantage,
This is described in JP-A-61-90584 shown in FIG.
There are things that are. In this image projection apparatus, a condenser lens
The unpolarized parallel light emitted from 104 is polarized beam split
To the working surface (2) of the polarizing beam splitter 111.
Right angle prisms are formed on a slope that is glued together
Evaporated film) 111_aAnd P-polarized light L_PIs transmitted as it is, S-polarized light
Light L_SReflects upward at a right angle and enters the total reflection prism 112
I do. S-polarized light L_SIs at right angle with total reflection prism 112
The reflected light transmits through the polarizing beam splitter 111.
P-polarized light L_PTotal reflection prism 112 in the same direction as
Is emitted from. Here, the S-polarized light L_SIs a polarized beam
Working surface 111 of splitter 111_aWith a plane of polarization parallel to
Linearly polarized light, P-polarized light L_PIs the S-polarized component L_S
Linearly polarized light having a polarization plane orthogonal to all
A half-wave plate 113 is disposed on the exit side of the reflecting prism 112.
S-polarized light L emitted from the total reflection prism 112_SIs
The polarization plane is 90 ° by transmitting through the half-wave plate 113
Rotated, P-polarized light L_P ^*Is converted to In addition,
The output side of the splitter 111 and the half-wave plate 113
Wedge-shaped lenses 114 and 115 for changing the optical path are arranged respectively.
P-polarized light transmitted through the polarizing beam splitter 111
L_PAnd the P-polarized light L converted by the half-wave plate 113_P ^*Is
The optical path has been changed, and on the surface on the incident side of the liquid crystal light valve 117
Point P₀And intersect with each other to form a combined light. Therefore, in this image projection device, the polarization
S-polarized light L separated by the beam splitter 111_SAnd P
Polarized light L_PIlluminating the LCD light valve 117 with both
The image projection device shown in FIGS.
The light use efficiency can be doubled as compared with the arrangement. As another prior art document mentioned above, Japanese Patent Application Laid-Open
No. 63-121821 (Improved light use efficiency
Liquid crystal display device), U.S. Pat.
(Automotive headlight with polarization conversion element), USA
Patent No. 2810324 (high-efficiency polarizer) etc.
There is. [0011] However, the above-mentioned Japanese Patent Application Laid-Open
The image projection device described in Japanese Patent Application Laid-Open No.
Light light L_PAnd the P-polarized light L converted by the half-wave plate 113_P ^*When
To the liquid crystal light valve 117 at an angle θ shown in FIG.
Since each is incident, the characteristic deterioration due to the incident angle is large
When using a liquid crystal light valve 117, the wedge type
The distance from the lenses 114 and 115 to the liquid crystal light valve 117
Takes quite large, it is necessary to reduce the incident angle
There are drawbacks. As a method for solving this disadvantage, FIG.
Remove the wedge-shaped lenses 114 and 115 of the P-polarized light L_PWhen
P-polarized light L converted by the half-wave plate 113_P ^*And each other
Parallel illumination that enters the liquid crystal light valve 117 as parallel
A method is conceivable. However, this parallel lighting system is disclosed in
Application to an image projection device described in JP-A-61-90584
Also, unless light source 111 is a perfect point or line light source.
And the unpolarized parallel light emitted from the condenser lens 104
Is not perfect, the two P-polarized light components L_P,
L_P ^*Are not completely parallel. This is shown in FIG.
5 will be described. Emitted from a light source 101 having a finite diameter φ
The unpolarized light is transmitted through a condenser lens that is arranged at a distance L.
Focused by the lens 104, but emitted by the condenser lens 104.
The light is not completely parallel light, and has an angle of 2ω (ω = tan^-1
Non-parallel light with a spread in the range of {(φ / 2) / L})
Become. The ray α of the non-parallel light is a polarized beam splitter.
Incident on the half-wave plate 113 without being affected by the
S-polarized light and P-polarized light from the half-wave plate 113
The light is emitted while including The ray β is a polarized beam
S-polarized light L by splitter 111_SBut total reflection prism
After being reflected by 112, it is again reflected by the polarizing beam splitter 111.
Reflected, ray β₁As shown in the figure, P
Light light L_P ^*Out of the half-wave plate 113 as shown in FIG.
5 to ray β_TwoAbsorbed at the interface of the half-wave plate 113 as shown by
It is lost light because it is transmitted or transmitted as it is. Accordingly, the above-mentioned Japanese Patent Application Laid-Open No. 61-905 is disclosed.
The image projection device described in No. 84 is used in a parallel illumination system.
Wedge-shaped lenses 114 and 115 are necessary
However, consider the light incident angle characteristics of the liquid crystal light valve 117.
Considering that the angle θ shown in FIG.
Not work, wedge-shaped lenses 114 and 115 and liquid crystal light valve
The distance to 117 can't be reduced by more than a certain value
This hinders the downsizing of the entire device, and
Lighting efficiency with increasing distance between 1 and LCD light valve 117
(Light utilization rate) is disadvantageously reduced. Further, Japanese Patent Application Laid-Open No. 61-90584 mentioned above.
The image projection device described in the publication includes a polarizing beam splitter 111
1 and a total reflection prism 112 are required.
The disadvantage that the whole device is larger than that shown in 2
There is. An object of the present invention is to provide a compact polarization conversion system.
To provide an image projection device capable of
You. [0017] An image projection apparatus according to a first aspect of the present invention.
The image is formed by an illumination optical system and polarized light from the illumination optical system.
Image forming means for forming image light, and projecting the image light
A projection optical system, wherein the illumination optical system includes a light source.
A plurality of condensing lenses are arranged side by side in a predetermined direction
The lens group and the cross section arranged in the predetermined direction are parallel.
It has a plurality of quadrilateral glass members, and extends along the predetermined direction.
A plurality of units arranged side by side, and
Each of the plurality of light beams arranged in a predetermined direction is the plurality of units.
A polarizing element incident on a corresponding unit of
Forming the image with polarized light from the plurality of units of the device
And an optical system for illuminating the means,
Each of the units polarizes the incident light orthogonal to each other
A dividing section for dividing the reflected light and the transmitted light into
Reflecting one of the light and the transmitted light to the other traveling direction
A reflecting portion for turning in substantially the same direction, the reflected light and the
By changing the polarization direction of at least one of the transmitted light,
And a modulation unit for matching the polarization directions.
I do. An image projection apparatus according to a second aspect of the present invention provides an illumination optical system.
And an image forming an image light with polarized light from the illumination optical system.
Image forming means, and a projection optical system for projecting the image light.
The illumination optical system is provided at a position where the light traverses the optical path of the light from the light source.
A lens group in which a plurality of lenses are arranged in a fixed direction;
Plural glass parallel cross-sections arranged in a predetermined direction
A plurality of units having a member and arranged along the predetermined direction.
Having a plurality of lenses arranged in the predetermined direction from the lens group.
Each of the luminous flux is a corresponding unit of the plurality of units
And the plurality of units of the polarizing element
Optical system for illuminating the image forming means with polarized light from
And the plurality of units of the polarizing element are each
And separates the incident light beam into P-polarized light and S-polarized light.
A polarization separating film, and converting the p-polarized light transmitted through the polarization separating film into s-polarized light.
Reflection by a half-wave plate that converts light into light and the polarization separation film
Before reflecting the S-polarized light and exiting the half-wave plate
Reflecting film for directing in almost the same direction as the traveling direction of the S-polarized light
And having the following. An image projection apparatus according to a third aspect of the present invention provides an illumination optical system.
And an image forming an image light with polarized light from the illumination optical system.
Image forming means, and a projection optical system for projecting the image light.
The illumination optical system is provided at a position where the light traverses the optical path of light from the light source.
A lens group in which a plurality of lenses are arranged in a fixed direction;
Plural glass parallel cross-sections arranged in a predetermined direction
A plurality of units having a member and arranged along the predetermined direction.
Having a plurality of lenses arranged in the predetermined direction from the lens group.
Each of the luminous flux is a corresponding unit of the plurality of units
And the plurality of units of the polarizing element
Optical system for illuminating the image forming means with polarized light from
And the plurality of units of the polarizing element are each
And separates the incident light beam into P-polarized light and S-polarized light.
A polarization separation film, and s-polarized light reflected by the polarization separation film
A half-wave plate that converts the light into light, and the half-wave plate
P-polarized light that reflects the P-polarized light and transmits through the polarization separation film
And a reflective film for directing light in substantially the same direction as the traveling direction of light.
It is characterized by that. An image projection apparatus according to a fourth aspect of the present invention is an illumination optical system.
And an image forming an image light with polarized light from the illumination optical system.
Image forming means, and a projection optical system for projecting the image light.
The illumination optical system is provided at a position where the light traverses the optical path of the light from the light source.
A lens group in which a plurality of lenses are arranged in a fixed direction;
Plural glass parallel cross-sections arranged in a predetermined direction
A plurality of units having a member and arranged along the predetermined direction.
Having a plurality of lenses arranged in the predetermined direction from the lens group.
Each of the luminous flux is a corresponding unit of the plurality of units
And the plurality of units of the polarizing element
Optical system for illuminating the image forming means with polarized light from
And the plurality of units of the polarizing element are each
And separates the incident light beam into P-polarized light and S-polarized light.
Reflects a polarized light separating film and s-polarized light reflected by the polarized light separating film
And the traveling direction of the P-polarized light transmitted through the polarization separation film.
A reflective film oriented in the same direction, and S reflected by the reflective film.
A half-wave plate for converting polarized light into P-polarized light
It is characterized by the following. An image projection apparatus according to a fifth aspect of the present invention provides an illumination optical system.
And an image forming an image light with polarized light from the illumination optical system.
Image forming means, and a projection optical system for projecting the image light.
The illumination optical system is provided at a position where the light traverses the optical path of the light from the light source.
A lens group in which a plurality of lenses are arranged in a fixed direction;
Plural glass parallel cross-sections arranged in a predetermined direction
A plurality of units having a member and arranged along the predetermined direction.
Having a plurality of lenses arranged in the predetermined direction from the lens group.
Each of the luminous flux is a corresponding unit of the plurality of units
And the plurality of units of the polarizing element
Optical system for illuminating the image forming means with polarized light from
And the plurality of units of the polarizing element are each
And are inclined with respect to the light beam at substantially the same angle in opposite directions.
And the light reflected by each one of the polarization separation films
The incident light flux inclined so as to be incident on the polarization separation film.
A pair of polarization separation films for separating P-polarized light and S-polarized light,
The S-polarized light reflected by each of the pair of polarized light separating films is represented by P
The pair of polarized light separating films are opposed to each other to convert the polarized light into polarized light.
A pair of quarter-wave plates provided on the surface,
The S-polarized light reflected by the release film passes through the pair of quarter-wave plates.
After passing through the other polarization separation film,
The pair of polarized light separating films is reflected by reflecting the
Almost the same progress as P-polarized light transmitted without passing through the quarter-wave plate
In order to face in the row direction, the pair of polarization separation films is sandwiched.
And a pair of reflective films arranged in
You. An image projection apparatus according to a sixth aspect of the present invention is an illumination optical system.
And an image forming an image light with polarized light from the illumination optical system.
Image forming means, and a projection optical system for projecting the image light.
The illumination optical system is provided at a position where the light traverses the optical path of the light from the light source.
A lens group in which a plurality of condenser lenses are arranged along a fixed direction,
The cross-sections arranged in the predetermined direction have a plurality of parallelograms.
A plurality of unit members having a lath member and arranged in the predetermined direction.
And a plurality of lenses arranged in the predetermined direction from the lens group.
Each of the number of luminous fluxes corresponds to one of the plurality of units
A polarizing element incident on a unit, and the plurality of polarizing elements
Light for illuminating the image forming means with polarized light from a unit
A plurality of units of the polarizing element,
The light beams are inclined at substantially the same angle in opposite directions to each other.
Light reflected by one of the polarization splitting films
The incident light beam is incident on the polarization splitting film
A pair of polarization separation films for separating P-polarized light and S-polarized light,
The S-polarized light reflected by each of the pair of polarized light separating films is represented by P
In order to convert the light into polarized light, it is provided between the pair of polarized light separating films.
The light is reflected by the half-wave plate and
S-polarized light passes through the half-wave plate and is polarization-converted.
After that, the P-polarized light that has passed through each of the other polarization separation films is deflected.
And irradiates the pair of polarization separation films through the half-wave plate.
In the same traveling direction as the transmitted P-polarized light
In addition, a pair of counters arranged so as to sandwich the pair of polarization separation films
And a projection film. Any one of the image projection apparatuses according to the first to sixth inventions
In the above, the image forming means includes a liquid crystal display element and the liquid
On the light emitting side of the liquid crystal display element separately from the liquid crystal display element.
And an illumination optical system.
A lamp as the light source and the polarized light from the lamp
It may have a concave mirror that reflects towards the element. Any one of the image projection apparatuses according to the second to sixth aspects of the invention.
In each of the units, the wave plate and the polarization component
The release film is both provided on the prism constituting the unit.
It may be. In the image projection apparatus according to the first invention,
In each unit, the modulating unit and the dividing unit are both
It may be provided on a prism constituting a unit. In any of the above-described image projection apparatuses,
The lens group includes a lens array of lenses in the predetermined direction.
Eye lens or wrench in which lenses are aligned in the predetermined direction
It may have a lens. The image projection apparatus according to the second to sixth inventions
In any case, the wave plate may be a material such as mica or quartz.
Crystal, stretched polymer film, aligned with molecular axis
Low-molecular liquid crystal, side-chain high-molecular liquid crystal, or polymer
It consists of a polymer liquid crystal in which a low molecular liquid crystal is dispersed in a polymer.
May be. Further, in the image projection apparatus according to the first invention,
The modulating section may be made of a crystal such as mica or quartz,
Molecular films, low molecular liquids with aligned molecular axes
Crystal, side chain type polymer liquid crystal, or low molecular liquid crystal in polymer
It may be composed of a polymer liquid crystal dispersed in a polymer. Any of the image projectors of the invention described above
In the above, the supply means may include three colors of R, G, and B.
Has multiple dichroic mirrors for obtaining polarized light
And the image forming means is a three-color polarized light of R, G, and B.
Liquid crystal table which forms image light of R, G, B three colors by
And a projection device, wherein the projection means is provided for the three colors of R, G, and B.
You may comprise so that image light may be combined and projected. [0030] DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings.
A description will be given with reference to a plane. FIG. 1 is used in the image forming apparatus of the present invention.
1 shows a first embodiment of a plate-like polarizing element.
FIG. The unit 20 of the plate-like polarizing element of this embodiment is
A first entrance side surface having a triangular prism shape of a right triangle
Rhythm 21₁And the first incident side prism 21₁On both sides of each other
The first prism on the incident side, which is lined up with the slope
M21₁First and second exit side plugs having the same shape as
Rhythm 22₁, 22_TwoAnd the first exit side prism 22₁of
First incident side prism 21₁Slopes on opposite sides
First incident side prism 21 arranged to be touched₁Half of
Second incident-side prism 21 having a minute shape_TwoAnd the second
Exit side prism 22_TwoFirst incident side prism 21₁When
A second entry, lined up with the slopes touching each other on opposite sides
Launch side prism 21_TwoA third entrance side pump having the same shape as
Rhythm 21_ThreeAnd three incident-side prisms 21₁~
21_ThreeAnd two exit-side prisms 22₁, 22_TwoAnd together
Thus, one parallel flat plate is formed. In addition, the first input
Launch side prism 21₁And the first exit side prism 22₁Contact with
The first incident side prism 21 is provided on the contact surface.₁The first 1 /
4-wavelength plate 23₁Are provided, and the first exit side prism is provided.
Room 22₁The first polarization splitting film 24 on the side₁Is provided
You. Further, the first incident side prism 21₁And the second emission
Side prism 22_TwoThe first incident side prism is
M21₁A second quarter-wave plate 23 on the side_TwoIs provided
The second exit-side prism 22_TwoSecond polarization separation on the side
Film 24_TwoIs provided. Second incident side prism 2
1_TwoAnd the first exit side prism 22₁The contact surface with
Total reflection mirror 25₁Is formed on the third incident side.
Prism 21_ThreeAnd the second exit side prism 22_TwoContact surface with
Has a second total reflection mirror 25_TwoIs formed. This
Here, the first and second polarization separation films 24 are formed.₁, 24
_TwoReflects S-polarized light having a plane of polarization parallel to the film plane.
And transmits P-polarized light having a polarization plane perpendicular to the film plane.
Have the properties to pass. Also, the first and second quarter waves
Long plate 23₁, 23_TwoIs the first and second incident light P₁, P_Two
Acts on light incident at an incident angle of 45 ° as in
Whose axial direction converts S-polarized light into circularly polarized light.
Has been selected to be. That is, the unit of the plate-like polarizing element of this embodiment is
In 20, the first incident side prism 21₁And the first exit side
Prism 22₁Contact surface and first incident side prism
21₁And the second exit side prism 22_TwoThe contact surface with
Light (first and second incident light P₁, P_TwoAbout)
Reflected light from one side having the same angle of inclination (first and
2 S-polarized light L_S1, L_S2) Towards each other so that they go to the other
It functions as a pair of split surfaces that meet each other, and
Light separation film 24₁, 24_TwoHowever, the planes of polarization of the incident light
The orthogonal 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) Functions as a dividing unit. In addition, the first
And second total reflection mirror 25₁, 25_TwoBut reflected light and
One of the transmitted lights (the first and second S-polarized lights L_S1, L_S2)
And the other (first and second P-polarized light L_P1,
L_P2) As a reflector that points in almost the same direction as the traveling direction
Function. Further, the first and second quarter-wave plates 23
₁, 23_TwoIs at least one of reflected light and transmitted light (first
And the second S-polarized light L_S1, L_S2Change the polarization plane)
Function as a modulator for matching the polarization planes of the two. Next, the unit 20 of the plate-like polarizing element of the present embodiment will be described.
The operation of will be described. First incident side prism 21₁And the first emission
Side prism 22₁45 ° incident angle to the contact surface with
Incident first incident light P having a random plane of polarization₁
Is the first quarter-wave plate 23₁After passing through the first
Light separation 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
Is reflected at right angles 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_P1In the same direction as
Shoot. The first incident side prism 21₁And the second
Exit side prism 22_Two45 ° into the contact surface with
A second incidence with a random plane of polarization incident at an angle of incidence
Light P_TwoIs the second quarter-wave plate 23_TwoAfter passing through the second
Polarization separating film 24_TwoAnd incident perpendicular to the film surface
Second P-polarized light L having a plane of polarization_P2Is the second polarization separation
Film 24_TwoHas a plane of polarization parallel to the film plane
Second S-polarized light L_S2Is the second polarization splitting film 24_Twoso
By being reflected at right angles to the left, the second P-polarized light L
_P2And the second S-polarized light L_S2And divided into Second P-polarized light
Light L_P2Is the second exit side prism 22_TwoExit from exit surface of
I do. On the other hand, the second S-polarized light L_S2Is the second quarter wavelength
Board 23_TwoWas converted into circularly polarized light by passing through
The first quarter-wave plate 23₁Through the
1 polarized light separating film 24₁Polarization plane perpendicular to film surface
Converted P-polarized light L having_P2 ^*Is converted to
You. Second converted P-polarized light L_P2 ^*Is the first polarization separation
Working film 24₁Through the first total reflection mirror 25₁
Is reflected upward at a right angle to the first exit side prism 22
₁From the exit surface of the second P-polarized light L_P2The same as the direction of travel
It emits in the direction. 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 described.
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
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 large degree of freedom. Also,
It is possible to use a combination of parallel plates without using rhythm
In this case, the transmittance of the P-polarized light
It is inferior to the case using a system. 1st and 2nd quarter wave
Long plate 23₁, 23_TwoAre crystalline ones such as mica or quartz,
Stretched polymer film, constant thickness, constant direction
-Molecule liquid crystal, side-chain type polymer aligned with aligned molecular axes
It is composed of liquid crystal or low-molecular liquid crystal dispersed in a polymer.
Can be achieved. First and second polarized light separating 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. A plurality of units 20 shown in FIG.
As an example of a configuration of an optical element, as shown in FIG.
Plate-shaped polarizing element 4 configured by arranging a plurality of units 20 in the horizontal direction
There is one. As another configuration example, as shown in FIG.
A row composed of a plurality of units 20 arranged in the horizontal direction
Adjacent rows can be arranged in multiple rows with the pitch shifted by half.
There is a plate-shaped polarizing element 41a formed. 2 and FIG.
In the plate-shaped polarizing elements 41 and 41a shown in FIG.
The entrance-side prism (see FIG. 1), which is a connection surface between adjacent units
The second incident side prism 21 shown in FIG._TwoAnd the third entrance side pre
Zum 21_Three) May be integrally configured. FIG. 4 is used in the image forming apparatus of the present invention.
Example 2 of a plate-like polarizing element according to a second embodiment of the present invention.
It is a block diagram of the position 20a. The unit 20a of the plate-like polarizing element of this embodiment is shown in FIG.
The difference from the unit 20 of the plate-like polarizing element shown in FIG.
And the second quarter-wave plate 23₁, 23_TwoInstead of 1
/ 2 wavelength plate 26 is the first incident side prism 21₁And the first
Exit prism 22₁Contact surface and the first entrance side
Rhythm 21₁And the second exit side prism 22_TwoWith the contact surface
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 having its light plane rotated by 90 °_P1
^*Is converted to First converted P-polarized light L_P1 ^*Is the second
Polarization separating film 24_Two, Then the second total reflection
Mirror 25_TwoIs reflected upward at right angles to the second exit side
Prism 22_TwoFrom the exit surface of the first P-polarized light L_P1Progress
The light is emitted in the same direction as the direction. Further, the second incident light P
_TwoIs the second P-polarized light L_P2Is the second polarization splitting 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_TwoOutgoing 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
Reflected at right angles, the first exit side prism 22₁Outgoing
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. In addition, 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 used in the image forming apparatus of the present invention.
Example 3 shows a third example of a plate-like polarizing element,
FIG. The unit 30 of the plate-like polarizing element of this embodiment is
The split part (polarized light separating action film 34) converts the unpolarized light (incident light P)
The reflection part (total reflection film 35) is inclined with respect to the division part.
Are arranged in parallel, and the half-wave plate 36 is
Incident light (S-polarized light L_S), Especially the reflection portion (total reflection film 3).
5) reflected light (S-polarized light L_S) Arranged in the light path
It is composed. That is, the unit of the plate-like polarizing element of this embodiment is
30 is a first glass member 31 having a parallelogram cross section.
₁And the first glass member 31₁Contact the slope with each other on both sides of
The second and third sections are arranged in a right triangle,
Glass member 31_Two, 31_ThreeConsists of three glass parts
Lumber 31₁~ 31_ThreeAre integrated into a single parallel plate
ing. Also, the first glass member 31₁And the second glass
Member 31_TwoA total reflection film 35 is provided on the contact surface with
The first glass member 31₁And the third glass member 31_Three
The polarization separation film 34 is provided on the contact surface with
You. Further, the first glass member 31₁Exit surface (incident light
A half-wave plate 36 is provided on the surface opposite to the surface on which P is incident.
Is provided. Here, the polarization separation film 34 is a film
Reflects S-polarized light having a plane of polarization parallel to the
A P-polarized light having a polarization plane perpendicular to the
Has the property. The half-wave plate 36 has an incident angle of 90 °.
And acts on the incoming light. But
Therefore, in the unit 30 of the plate-like polarizing element of the present embodiment, the polarization component
The separating film 34 reflects the incident light so that the planes of polarization are orthogonal to each other.
Light (S-polarized light L_S) And transmitted light (P-polarized light L_PSplit into)
Function as a dividing unit. Further, the total reflection film 35
One of the emitted light and the transmitted light (S-polarized light L_S) Reflect others
(P-polarized light L_P) In the same direction as the direction of travel
It functions as a reflector. Further, the half-wave plate 36 is
At least one of emitted light and transmitted light (S-polarized light L_S)of
A modulator that changes the plane of polarization to match both planes of polarization
Function. Next, the unit 30 of the plate-like polarizing element of this embodiment is used.
The operation of will be described. 45 ° with respect to the surface of the polarization separation film 34
Incident light with random plane of polarization incident at an angle of incidence
P is a P-polarized light L having a polarization plane perpendicular to the film plane_P
Is transmitted through the polarization separation film 34 and is polarized parallel to the film surface.
S-polarized light L having an optical surface_SIs the polarization separation film 34 on the left
At right angles to the P-polarized light L_PAnd S-polarized light
Light L_SAnd divided into P-polarized light L_PIs the third glass member
31_ThreeExit surface (surface opposite to the surface on which incident light P is incident)
Emitted from On the other hand, S-polarized light L_SIs on the total reflection film 35
Reflected at right angles to the second glass member 31_TwoOutgoing surface of
To P-polarized light L_PEmitted in the same direction as
That is, by transmitting through the half-wave plate 36, the polarization plane becomes 9
P-polarized light L rotated by 0 °_P ^*Is converted to Accordingly
The unit 30 of the plate-like polarizing element of the present embodiment is the first glass.
Member 31₁The incident light P incident on the P-polarized light L_PAnd the strange
The converted P-polarized light L_P ^*To the entire exit surface
Can be emitted from the surface. A plurality of units 30 shown in FIG.
As an example of the configuration of the optical element, the unit 2 shown in FIG.
Similarly to FIG. 0, there are configuration examples shown in FIGS. here
The unit 30 shown in FIG. 5 constitutes a plate-like polarizing element.
In this case, the configuration is such that multiple parallelogram glass members are
It has better workability than the unit 20 shown in FIG.
There is an effect that there is. That is, the unit 20 is
Glass plate provided with release film 34 on one side and total reflection film 35
(For example, an aluminum vapor-deposited film) on one side with a glass plate
Are alternately laminated, cut at a 45 ° cross section, and the cut surface is
After polishing, the half-wave plate 36 is bonded.
Can be created easily. FIG. 6 is used in the image forming apparatus of the present invention.
Example 4 of a plate-like polarizing element according to a fourth embodiment of the present invention.
It is a block diagram of the position 30a. The unit 30a of the plate-like polarizing element of this embodiment is shown in FIG.
The difference from the unit 30 of the plate-like polarizing element shown in FIG.
The two-wavelength plate 36 is combined with the polarization separation film 34 (divided portion) and total reflection
That is, it is arranged between the film 35 (reflection portion). In the unit 30a 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.
By being reflected at an angle, 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
Out of the light exit surface. On the other hand, S-polarized light L_SIs 1/2 wave
By passing through the long plate 36, the plane of polarization is rotated by 90 °.
P-polarized light L_P ^*After being converted to
Is reflected at right angles to the second glass member 31_TwoOutgoing surface of
P-polarized light L_PAre emitted in the same direction as the traveling direction of. did
Therefore, the unit 30a of the plate-shaped polarizing element of the present embodiment is the first unit.
Glass member 31₁The incident light P incident on the P-polarized light L_PWhen
The converted P-polarized light L_P ^*And without loss,
The light can be emitted from the entire launch surface. FIG. 7 is used in the image forming apparatus of the present invention.
Example 5 of a plate-like polarizing element according to a fifth embodiment of the present invention.
It is a block diagram of the position 30b. The unit 30b of the plate-like polarizing element of this embodiment is shown in FIG.
The difference from the unit 30 of the plate-like polarizing element shown in FIG.
The two-wavelength plate 36 transmits light (P-polarized light L_P) Is the optical path
Glass member 31 of 3_ThreeIs bonded to the exit surface of
is there. 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.
By being reflected at an angle, 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 polarization plane 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 is reflected upward at a right angle to the second glass member 31_Twoof
From the exit surface, the converted S-polarized light L_SSame as the direction of travel
Emit in the same direction. Therefore, the plate-shaped polarizer of the present 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 used in the image forming apparatus of the present invention.
1 is a perspective view showing a part of a first embodiment of a polarization conversion unit.
It is. The polarization conversion unit 40 of this embodiment is similar to that of FIG.
And the incidence of the plate-like polarizing element 41 shown in FIG.
The non-polarized light provided on the side into non-polarized light in a fence-like 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 so as to be 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(Non-polarized 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. Furthermore, 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
Incident light P which is incident on the incidence surface at a right angle₁~ P_ThreeIs focused
Working surface 43₁~ 43_ThreeShown in FIG.
As shown in FIG.₁, 45_TwoDivergent without incident
Face 44₁~ 44_ThreeDiverging surface 44₁
~ 44_ThreeTo be collimated by the
The light exiting from the lens 42 is non-polarized in a fence-like pattern.
It becomes light. The non-polarized light in this fence pattern is a plate-shaped polarizer.
After being converted into polarized light by the element 41, each unit 20₁~ 20_Three
The light exits from the entire exit surface. The diverging surface 44₁
~ 44_ThreeThe absolute value of the focal length of₁~ 43_Three
By using half the focal length of a double-sided lenticular
-Unpolarized light having a fence-like pattern emitted from the lens 42
Focusing surface 43₁~ 43_ThreeHalf the pitch of
Can be. In addition, the non-operation surface 45₁, 45_TwoAbsorption membrane
To reduce the adverse effects of diffuse reflection, etc.
Can be. The polarization conversion unit 40 of this embodiment is as follows.
Has the following advantages. (1) Enter with a double-sided lenticular lens 42
Light P₁~ P_ThreeInto a non-polarized light with a fence-like pattern
Each unit 20 of the polarizing element 41₁~ 20_ThreeTo be incident on
Each unit 20₁~ 20_ThreeCan reduce the size of
You. Further, each unit 20 of the plate-like polarizing element 41₁~ 20_ThreeNo
To further reduce the size, double-sided lenticular
Focusing surface 43 of lens 42₁~ 43_ThreeThe pitch of the
Then, the number of divisions of the fence pattern may be increased. (2) The light source has a finite diameter.
However, the incident light P₁~ P_ThreeDenotes each unit 20 of the plate-like polarizing element 41
₁~ 20_ThreeFirst and second polarization separation films 24₁, 4
5_TwoOf the conventional image projection shown in FIG.
The disadvantages of the shadow device can be eliminated, and the light utilization efficiency and output
The degree of polarization of the emitted light can be improved. In particular, the first
And second polarization separation film 24₁, 24_TwoIs for S-polarized light
It is relatively easy to set the reflectivity to 100%
Therefore, the degree of polarization of the emitted light can be kept high. (3) Each unit 20 of the plate-shaped polarizing element 41₁~
20_ThreeThe first, second and third incident components
Side prism 21₁~ 21_ThreeAnd first and second emission side pre-
Zum 22₁, 22_TwoMeans the same shape and size
Can reduce the number of parts in production.
Cost can be reduced. In particular, a large percentage in terms of cost
Prism type that occupies
The effect of cost reduction is very large. The double-sided lenticular lens 42 has good moldability.
Considering optical characteristics such as ease of transmission and transmittance,
Extrusion or compression molding
Can be used. However, especially heat resistance
If required, compression made of glass
It is preferable to use a molded or polished product.
The double-sided lenticular lens 42 is formed by integral molding.
You can also attach a single-sided lenticular lens
You may comprise. Also, when the light source has a finite diameter
Is a diverging surface 44₁~ 44_ThreeFocus Absolute Value of Focal Length
Working surface 43₁~ 43_ThreeLess than half the focal length of
Therefore, the light flux existing area of the non-polarized light in the fence pattern and the light flux
The ratio with respect to the existence area can be set to 1: 1. The polarization conversion unit 40 of this embodiment is similar to that of FIG.
Plate-like polarizing element 41 and double-sided lenticular lens shown in FIG.
42, but the unit shown in FIGS.
A plate-like polarizing element comprising 20a, 30, 30a, and 30b;
You may comprise using a double-sided lenticular lens. Next, the image forming apparatus of the present invention is used.
A second embodiment of the polarization conversion unit will be described. The polarization conversion unit of this embodiment is shown in FIG.
Plate-shaped polarizing element 41a and incidence of the plate-shaped polarizing element 41a
The non-polarized light on the side
From a double-sided fly-eye lens
Become. In the polarization conversion unit of this embodiment, the double-sided
The incoming light is split vertically and horizontally by a lie-eye lens.
After that, each unit 20 of the plate-shaped polarizing element 41a₁~ 20_FiveNo.
1 incident side prism 21₁Incident on This implementation
Also in the example, the units 20a, 30, and 30 shown in FIGS.
Plate-shaped polarizing element composed of 30a and 30b and double-sided fly-eye
You may comprise using a lens. FIG. 10 shows a first embodiment of the image projection apparatus according to the present invention.
It is a schematic structure figure showing an example. The image projection apparatus according to the present embodiment has a first
Parallel white light (non-polarized light) from the sensor lens 64
Polarized light shown in FIG. 8 as an illumination optical system for converting to linearly polarized light
The point that the conversion unit 40 is used is different from the image shown in FIG.
Different from the image projection device. Note that the image projection device of the present embodiment
Of the polarization conversion unit 40 and the liquid crystal light valve 66
In between, the white linearly polarized light from the polarization conversion unit 40 is projected.
Second condenser lens for condensing light in the pupil of the imaging lens 68
The door 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
To illuminate the liquid crystal light valve 66 using the
The white light (non-polarized light) emitted from 1
Light to the light valve 66
Shorten the distance from the source 61 to the liquid crystal light valve 66
Can reduce the size of the image projection device.
You. FIG. 11 shows a second embodiment of the image projection apparatus according to the present invention.
It is a schematic structure figure showing an example. The image projection apparatus according to the present embodiment uses a non-polarized light (white
A light source 71 for emitting colored light), a reflecting mirror 72,
A cut filter 73, a first condenser lens 74,
Illumination optical system that converts unpolarized light from light source 71 to polarized light
Image by modulating the polarized light according to the video signal.
An image generator for generating an image, and projection light for projecting the image
Consisting of academics. Here, the illumination optical system is a non-polarized light.
White light into red, green, and blue unpolarized light.
The first dichroic mirror 81 for disassembly and the second dichroic mirror for disassembly
Ecroic mirror 82 and reflection mirror 83 for disassembly
Color separation system, and the optical path for unpolarized light of each color.
The same as the polarization conversion unit 40 shown in FIG.
Polarization conversion unit 40 having configuration_R, 40_G, 40_BWhen,
Red condenser lens 75_R, Green condenser lens 7
5_GAnd blue condenser lens 75_BAnd is composed of
I have. In addition, the image generating unit generates an image of each color of red, green, and blue.
Liquid crystal light valve for red which is three generators
76_R, Green liquid crystal light valve 76_GAnd blue liquid crystal
Light valve 76_BConsists of Further, the projection optical system includes:
First combining dichroic mirror 84 and combining reflection
Mirror 85 and second dichroic mirror 86 for synthesis
And a projection lens 78. In the image projection apparatus of this embodiment, the red
Light light P_RIs on the first disassembly dichroic mirror 81
And a first dichroic disassembly
Non-polarized light P transmitted through the mirror 81_G+ P_BBaby
Blue unpolarized light P_BIs the second dichroic mixer for decomposition
And the green unpolarized light P_GIs for the second disassembly
The light is reflected upward by the dichroic mirror 82 at right angles.
As a result, the light is emitted from the first condenser lens 74
In addition, the parallel white light P which is unpolarized light_R+ P_G+ P_BIs red,
Unpolarized light P of each color of green and blue_R, P_G, P_BIs decomposed into
Note that the red unpolarized light P_RIs the reflection mirror 83 for disassembly, left
After being reflected at right angles to the right, the polarization conversion unit 40 for red
_RAnd is converted into red polarized light. Also green
Unpolarized light P_GIs a second dichroic mirror for disassembly 8
After being reflected at 2, the green polarization conversion unit 40_GTo
The incident light is converted into green polarized light. In addition, the blue
Unpolarized light P_BIs a second dichroic mirror for disassembly 82
And then the blue polarization conversion unit 40_BIncident on
Then, it is converted into blue polarized light. The red polarized light is supplied to the red condenser lens 7.
5_RThrough the liquid crystal light valve 76 for red_RIncident on
The plane of polarization is rotated according to the red component of the color video signal.
Of the P-polarized light and S-polarized light
It becomes a luminous flux including both, and further a polarizing plate 77 for red._RBy
Linearly polarized red image light R^*Is converted to Similarly,
The green polarized light is supplied to the liquid crystal light valve 76 for green._Gand
Green polarizing plate 77_GOf the color video signal green
Green image light G modulated according to color components^*Is converted to
Further, the blue polarized light is supplied to the blue liquid crystal light valve 76._B
And blue polarizing plate 77_BOf the color video signal
Blue image light B modulated according to the blue component of the signal^*Conversion to
Is done. Red image light R^*And green image light G^*Is the first
Synthesized by the dichroic mirror 84 for synthesis
Image light R^*+ G^*After the conversion, the second synthesis dichroic
The light enters the Ick mirror 86. In addition, blue image light B
^*Was reflected upward at a right angle by the reflecting mirror 85 for synthesis.
After that, the light enters the second dichroic mirror 86 for synthesis.
You. Then, the yellow image light R^*+ G^*Is the second synthetic dike
The blue image light B transmitted through the Loic mirror 86^*Is the second
Reflected at right angle to left by dichroic mirror 86 for synthesis
The yellow image light R^*+ G^*And blue image light B^*
Were synthesized and modulated according to the color video signal.
White image light R^*+ G^*+ B^*Is converted to White image light R^*
+ G^*+ B^*Is screen (not shown) by the projection lens 78.
Shown), and a color image is projected on the screen.
It is. The image projection apparatus according to the present embodiment has a red, green, and blue
Unpolarized light P of each color_R, P_G, P_BPolarization conversion unit for each
Has the following effects. (1) Red polarization conversion unit 40_R, For green
Polarization conversion unit 40_GAnd blue polarization conversion unit 4
0_BQuarter-wave plate and polarization used for each unit
Zeroing the wavelength dependence of the separation membrane (see Fig. 1)
Since it is difficult, the parallel white light P_R+ P_G+
P_B, Unpolarized red, green, and blue colors
Light P_R, P_G, P_BThe light use efficiency
I can improve it. (2) Generally, the light source 71 has a finite diameter
Therefore, the white light emitted from the light source 71 always has a finite spread.
With an angle. The beam diameter of light with a finite divergence angle
Is compressed by some optical system, the beam diameter is reduced.
The divergence angle increases in inverse proportion to the ratio. Therefore, the figure
In the conventional image projection apparatus shown in FIG.
Yes, because the distance between the
Even if the beam diameter of light with a minimum divergence angle is compressed, the light
Light collection efficiency to the liquid crystal light valve 117 due to increase in the angle of inclination
Decreases. On the other hand, in the image projection apparatus of the present embodiment,
Since a flat plate polarization conversion unit is used, the polarization
Replacement unit can be installed close to the liquid crystal light valve
And the unpolarized light P of each color of red, green, and blue_R, P_G, P_BExpansion
The light collection efficiency of the liquid crystal light valve 117
Prevents decline. Next, a third embodiment of the image projection apparatus of the present invention will be described.
An example will be described. The image projection apparatus according to the present embodiment uses a green polarization converter.
Unit 40_GAnd blue polarization conversion unit 40_BInstead of
In addition, the first disassembly dichroic mirror 81 and the second
Between the splitting dichroic mirror 82 (green non-polarized light
Light P_GAnd blue unpolarized light P_BAnd a common optical path)
The point having the polarization conversion unit for cyan is shown in FIG.
Image projection device. When a plurality of polarization conversion units are used,
Indicates the efficiency of light emitted from the light source and
In terms of raw suppression, each polarization conversion unit is optically equivalent.
Position (where the traveling direction and amplitude of light are equivalent).
Since it is better to arrange them respectively, the image projection shown in FIG.
Although it is desirable to configure it like a shooting device, the number of parts
In the case where reduction is prioritized, for example, the image projection apparatus of the present embodiment is used.
And reduce the number of polarization conversion units.
Also improve light utilization efficiency over conventional image projection equipment.
As well as making the entire device more compact
I can do it. 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 lens
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. In addition, the image projection of the present invention
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 combines images
The polarization conversion unit 40 shown in FIG.
No. In addition, as disclosed in Japanese Patent Application Laid-Open No. 62-1391,
Of white light into each color light by the cube prism
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. 8 on the emission surface of each color light of the prism
The unit 40 may be arranged. [0082] As described above, according to the present invention,
Unpolarized light emitted from a light source in a compact system is polarized light
To improve the 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 one configuration example 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-like 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-like polarizing element unit 30b showing a fifth embodiment of the plate-like polarizing element used in the image projection apparatus of the present invention. FIG. 8 is a perspective view showing a part of a 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; [Description of Signs] 20, 20 _{1 to} 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 Polarized light 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 light conversion unit 40 _G Green light polarization conversion unit 40 _B Blue light 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 condenser lens 76 _R 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 second cracking dichroic mirror 83 cracking reflecting mirror 84 first synthesizing dichroic mirror 85 for synthesizing reflection mirror 86 second synthesizing dichroic mirror _{P, P 1, P 2,} P 3 the 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 *,}} S is L _S2 ^* convert 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

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) G03B 21/14 G03B 21/14 A (72) Inventor Shigeru Kawasaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Within Canon Inc. (72) Inventor Kazumi Kimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Junko Shinkaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. F-term (for reference) 2H049 BA05 BA06 BA07 BB03 BC22 2H088 EA14 EA15 HA13 HA15 HA20 HA21 HA24 HA28 MA06 MA20 2H091 FA05Z FA08X FA08Z FA14X FA26X FA26Z FA41Z FB07 FB08 FC02 FC15 FD15 LA11 MA07 2H0A01A07 DA05 BC14 BC25

Claims (1)

1. An illumination optical system comprising: an illumination optical system; image forming means for forming image light with polarized light from the illumination optical system; and a projection optical system for projecting the image light. The optical system includes a lens group in which a plurality of condenser lenses are arranged along a predetermined direction crossing an optical path of light from the light source, and a plurality of glass members having a parallelogram-shaped cross section arranged in the predetermined direction, A polarizing element having a plurality of units arranged in the predetermined direction, and each of a plurality of light beams arranged in the predetermined direction from the lens group being incident on a corresponding unit of the plurality of units; An optical system for illuminating the image forming means with polarized light from the plurality of units of the polarizing element, wherein the plurality of units of the polarizing element are respectively a reflected light and a reflected light whose polarization directions are orthogonal to each other. Dividing into transmitted light Part, a reflecting part for reflecting one of the reflected light and the transmitted light and directing the reflected light and the transmitted light in the same direction as the other traveling direction, A modulating unit for matching directions,
An image projection device comprising: