JPH06202046A - Projection device - Google Patents

Abstract

PURPOSE:To obtain the projection device which can project a projection image original image of a light valve, etc., on a screen with uniform brightness. CONSTITUTION:A Schlieren optical system having a secondary light source forming means 3 which forms plural secondary light source images of a light source part S1, an image forming lens S2 which forms the secondary light source images on the projection surface side of the light valve 6, and a light shield member 7 which is provided at a nearly conjugate position about the image forming lens S2 for the secondary image source images and has opening parts corresponding to the secondary light source images is used when the light valve 6 is lighted with the luminous flux from the light source part S1 and the image on the light valve 6 is projected on the projection surface through a projection lens 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection device for projecting an original image of a projected image such as a liquid crystal light valve onto a screen surface by a projection system. For example, the present invention relates to a projection device that can obtain a bright and uniform projected image by using a Schlieren optical system as a part of the projection system.

Further, a projected image original image (color liquid crystal panel) having different color information is projected onto a screen surface while maintaining a good color balance by utilizing a color separation means such as a dichroic film having an appropriate structure. The present invention relates to a projection device that can perform.

[0003]

2. Description of the Related Art Conventionally, various projection apparatuses have been proposed in which a projection image original image such as a liquid crystal light valve whose light transmission state changes is enlarged and projected on a screen surface by a projection system.

FIG. 4 is a schematic view of a main part of a conventional projection device using a light valve.

In FIG. 1, the light flux from the light source 101 is reflected by the reflecting mirror 1.
02 and the condenser lens 105 collect light to illuminate the light valve 106. And light valve 1
The projection image original image formed in 06 is projected onto the screen surface (not shown) by the projection lens 107.

On the other hand, conventionally, a plurality of projection image original images having color information, such as liquid crystal light valves, are illuminated by predetermined color lights, optically superposed, and then enlarged and projected on a screen surface by a projection lens. Various projection devices (color liquid crystal projector devices) configured in this way have been proposed.

FIG. 11 is a schematic view of a main part of an optical system of a conventional color liquid crystal projector device.

Generally, when performing color display in a color liquid crystal projector device, as shown in FIG. 11, white illumination light from a light source 201 is emitted by two dichroic mirrors 205X and 205B as three primary color lights of red, green and blue. Liquid crystal panel 202 divided into two and corresponding to each color light
The original images on the R, 202G, and 202B are illuminated, and the original images of the respective color light components are combined and projected again by the two dichroic mirrors 205A and 205C.

In FIG. 11, 201 is a white light source and 202
R, 202G and 202B are liquid crystal panels for red, green and blue respectively, 203 is a projection lens, and 204A and 204
B is a total reflection mirror, 205X is a dichroic mirror that transmits only a green component, 205A and 205B are dichroic mirrors that reflect only a blue component respectively, and 205C is a dichroic mirror that reflects only a red component.

The white light emitted from the white light source 201 is first separated by a dichroic mirror 205X into a transmitted green component and a reflected color component other than green, and the reflected light is further reflected by a dichroic mirror 205B and a red component transmitted. Separated into components.

The green light is bent at a right angle by the total reflection mirror 204A, then passes through the liquid crystal panel 202G, and is combined by the dichroic mirror 205B with the blue light that has passed through the liquid crystal panel 202B.

Then, the red light that has been bent at a right angle by the total reflection mirror 204B after passing through the liquid crystal panel 202R to this combined light is combined by the dichroic mirror 205C, and the original image of each liquid crystal panel 202R, 202G, 202B is projected onto the projection lens. An image is enlarged and projected on a screen (not shown) by 203.

[0013]

In the projection apparatus shown in FIG. 4, a liquid crystal that employs polarized light to display an image is normally used as the light valve. Then, only one of the orthogonal polarization components is selected by the polarizing plate and used for image display. Therefore, there is a problem that the screen displayed on the screen becomes dark.

In order to solve this difficulty, a projection apparatus using a light valve that does not require polarized light has been proposed. For example, there is a projection device that uses a schlieren optical system that displays an image by changing the light transmission state of a light valve based on the principle of diffraction or scattering.

However, according to this method, when forming the schlieren optical system, since the light blocking member that can partially transmit the light valve on the incident side is used, some light components are lost by the blocking portion.

Further, when a single pinhole is used as the light-shielding member on the incident side, the amount of light illuminating the light valve differs between on-axis and off-axis, resulting in uneven brightness in the projected image. There was a problem that came.

A first object of the present invention is to provide a plurality of secondary light sources near a light source when a projection lens enlarges and projects a projection original image formed on a light valve whose transmission state changes depending on the presence or absence of a signal by illumination light. By providing a secondary light source image forming means for generating an image and using this and a Schlieren optical system,
It is intended to provide a projection device that enhances light use efficiency and obtains a bright projected image.

Further, in a method of illuminating a light valve or the like with a light beam from a light source through a concave reflecting mirror, in a cross section perpendicular to the optical axis of the reflected light reflected by the concave mirror, the amount of light in the peripheral portion is larger than that in the peripheral portion. The light intensity is different. Therefore, there is a problem that unevenness of light amount occurs on the light valve illuminated by this light flux, and the brightness of the central portion and the peripheral portion of the image projected on the screen surface is different.

A second object of the present invention is to generate a plurality of secondary light source images from one light source at a position apart from the light valve by using the secondary light source image forming means, It is an object of the present invention to provide a projection apparatus that can obtain a projected image with uniform illuminance on a screen by eliminating the uneven illuminance on the surface of the light valve by illuminating the light of FIG.

In the color liquid crystal projector device shown in FIG. 11, it is desirable that the spectral characteristics of the dichroic mirror 205X for separating the green component when separating and combining the color components are as shown in FIG.

However, it is difficult to manufacture a bandpass filter that selectively transmits only a specific wavelength range, and actually has a spectral characteristic as shown in FIG.

Further, since the color separation film structure becomes complicated, it is difficult to obtain the accuracy of the separation wavelength. Therefore, there is a problem that it is very difficult to maintain good color balance of the projected image.

A third object of the present invention is to appropriately set an optical member on which a dichroic film for color separation is provided, so that a projected image of a predetermined colored light on a light valve can have a corresponding colored light with good spectral characteristics. The present invention provides a projection device that can effectively illuminate with a projection image and can easily obtain a projection image with good color balance.

[0024]

A projection apparatus according to the present invention comprises: (1-1) a light source, a reflection means for reflecting light from the light source,
A light valve configured to display an image by controlling a light transmission state according to the presence or absence of a signal, a projection unit for projecting an image, a secondary light source forming unit for forming a plurality of secondary light source images from the light source unit, An image forming lens for forming an image of the secondary light source image on the projection surface side of the light valve, and a plurality of secondary light source images provided at positions substantially conjugate with the image forming lens of the secondary light source image. The schlieren optical system having a light shielding member having an opening corresponding to is used.

(1-2) The secondary light source forming means forms a plurality of secondary light source images from the light source portion, and the light fluxes from the plurality of secondary light source images are condensed by the imaging lens to determine whether or not there is a signal. The image is displayed on the light valve surface by being superposed on each other to guide light, illuminating the light valve surface, and projecting the image displayed on the light valve onto the projection surface with a projection lens. It is characterized by having done.

(1-3) The light flux from the light source unit is separated into three color lights of the first, second and third color lights by the color separation system, and three projection images each having color information are generated by the three color lights. When illuminating and synthesizing the three projected images and projecting them on the projection surface, the color separation system reflects and separates the second colored light and a first colored light separating unit that reflects and separates the first colored light. A second color light separation means, a first color separation member for separating the first, second color light and the third color light, and a third color light separation means for reflecting and separating the first color light. The feature is that the color separation member 2 is used.

[0027]

1 is a schematic view of a main part of an optical system according to a first embodiment of a projection apparatus of the present invention.

In the figure, reference numeral 1 is a light source, and 2 is a reflecting mirror such as a parabolic surface or an elliptic surface for aligning the light from the light source 1 in the direction of the light valve 6. The light source 1 and the reflecting mirror 2 constitute a light source section S1. When the reflecting mirror 2 is a parabolic reflecting mirror, the light source 1 is arranged near the focal point thereof.

Reference numeral 3 denotes a secondary light source image forming means, which is a light source section S.
A plurality of secondary light source images 1a are formed from one, for example, a fly-eye lens in which a plurality of minute lenses are two-dimensionally arranged. Reference numerals 4 and 5 denote lenses, which illuminate the surface of the light valve 6 by superposing light beams from the plurality of secondary light source images 1a formed by the fly-eye lens 3 on each other.

Reference numeral 7 denotes a light shielding member, on the surface of which a plurality of openings 7a corresponding to a plurality of secondary light source images are provided. Reference numeral 8 denotes a projection lens, which magnifies and projects the projection original image formed on the light valve 6 onto the screen S (not shown).

The light valve of this embodiment is composed of, for example, a liquid crystal light valve which controls the light transmission state according to the presence or absence of a signal to display an image.

In the lens 5, the position of the secondary light source image 1a formed in the vicinity of the lens 4 and the position of the light shielding member 7 have a substantially conjugate relationship. In the lens 5, a conjugate image of the plurality of secondary light source images 1a is formed in each opening 7a of the light shielding member 7 by the secondary light source image 1a.
It is formed as a '.

Further, the lens 4 converts the emission directions of the light beams from the plurality of secondary light source images 1a and illuminates them so that they are superposed on each other on the surface of the light valve 6, whereby the surface of the light valve 6 is illuminated. Lighting is performed so that the illuminance is uniform.

In this embodiment, a light component which is not modulated by the light valve 6 forms a secondary light source image in the opening 7a of the light shielding member 7 as shown in FIG. 1, and passes through the opening 7a. It enters the projection lens 8.

Further, the light component on the surface of the light valve 6 which has undergone light modulation depending on the presence or absence of a signal is scattered. At this time, the secondary light source image 1a becomes a light beam (light source image) that spreads on the surface of the light shielding member 7, most of the light components are shielded by the light shielding region 7b, and only a small amount of light component enters the projection lens 8. As a result, the projection original image based on the light modulation on the surface of the light valve 6 is enlarged and projected on the screen S surface by the projection lens 8.

In this embodiment, the light-shielding member on the light-incident side of the light valve, which is required in the construction of a normal Schlieren optical system, is not used, which improves the light utilization efficiency and obtains a bright projected image. I am allowed to do so.

Further, the light fluxes from the plurality of secondary light source images are made to overlap each other on the surface of the light valve 6 by the imaging lens S2 so that the illuminance on the surface of the light valve becomes uniform. There is.

FIG. 2 is a schematic view of the essential parts of an optical system of Example 2 of the projection apparatus of the present invention.

In this embodiment, a cylindrical lens array (lenticular lens) extending in the direction perpendicular to the paper surface is used as the secondary light source image forming means 9 as compared with the first embodiment shown in FIG.
The difference is that a light-shielding member having a slit opening 10a extending in the direction perpendicular to the paper surface is used as the light-shielding member 10,
Other configurations are the same.

By the cylindrical lens array 9, a plurality of secondary light source images 9a extending from the light source section S1 in the one-dimensional direction (direction perpendicular to the paper surface) are formed in the vicinity of the lens 4. The lens 5 is configured such that the secondary light source image 9a and the light blocking member 10 have a substantially conjugate relationship. That is, the secondary light source image 9a is the light blocking member 1
The secondary light source image 9a 'is formed in the zero aperture 10a.

Further, the light beams from the plurality of secondary light source images 9a are condensed by the lens 4 and are superposed on each other on the surface of the light valve 6 so that the surface is uniformly illuminated. Then, the projection original image on the light valve 6 is enlarged and projected onto a screen (not shown) by the projection lens 8.

In the present embodiment, the cylindrical lens array 9 is used, and the illumination range is limited so that, for example, quadrilateral illumination around the optical axis is possible.

In this embodiment, the same effect as that of the first embodiment is obtained with the above-mentioned structure.

FIG. 3 is a schematic view of the essential parts of an optical system of Example 3 of the projection apparatus of the present invention.

In this embodiment, an ellipsoidal mirror is used as the reflecting mirror 2 as compared with the first embodiment in FIG. 1, the light emitting point of the light source 1 is arranged at one focus of the ellipsoidal mirror, and the optical fiber bundle 11 is arranged at the other focus.
Is located on the incident surface 11a. The point where a plurality of secondary light source images are formed on the exit surface 11b of the optical fiber bundle 11 and the plurality of openings 7a of the light shielding member 7 are arranged at the optical fiber bundle 1
It is different in that it is formed corresponding to a plurality of secondary light source images formed on one exit surface 11b, and other configurations are the same.

In this embodiment, the light flux from the secondary light source image formed on the exit surface 11b of the optical fiber bundle 11 is focused on the image forming lens S.
The light is condensed at 2 and is overlapped on the surface of the light valve 6 to uniformly illuminate the surface. Then, the projection original image on the light valve 6 is enlarged and projected on the screen surface (not shown) by the projection lens 8.

In this embodiment, instead of the ellipsoidal mirror, a rotary parabolic mirror and a lens system may be combined.

In this embodiment, by using the optical fiber bundle 11, the secondary light source image can be arranged at an arbitrary position without using a mirror or the like.

In the present embodiment, with the above-mentioned configuration, the same effects as those of the first embodiment are obtained in addition to the above-mentioned effects.

5 to 7 are schematic views of the main parts of the optical systems of Examples 4, 5 and 6 of the projection apparatus of the present invention.

Compared with the first embodiment, in the fourth, fifth and sixth embodiments, light beams from a plurality of secondary light source images are superposed on each other on the light valve surface without using the Schlieren optical system.
The difference is that the surface is illuminated.

Next, the constructions of the fourth, fifth and sixth embodiments will be sequentially described.

In the fourth embodiment of FIG. 5, 21 is a light source and 22
Is a parabolic or elliptical reflecting mirror for aligning the light from the light source 21 toward the light valve 26. The light source 21 and the reflecting mirror 22 constitute a light source section S21. When the reflecting mirror 22 is a parabolic reflecting mirror, the light source 21 is arranged near the focal point thereof. Reference numeral 23 denotes a secondary light source image forming means, which is a light source section S.
21 forms a plurality of secondary light source images 21a, and is composed of, for example, a fly-eye lens in which a plurality of minute lenses are two-dimensionally arranged.

Reference numerals 24 and 25 denote lenses, respectively, which are arranged so that the light fluxes from the plurality of secondary light source images 21a formed by the fly-eye lens 23 are superposed on each other on the surface of the light valve 26 to illuminate the surface. There is.

Reference numeral 24 is a field lens having a spherical surface, and 25 is a condenser lens. Reference numeral 28 denotes a projection lens, which magnifies and projects the projection original image formed on the light valve 26 onto the screen S (not shown).

The light valve of this embodiment is composed of, for example, a liquid crystal light valve which controls the light transmission state according to the presence or absence of a signal to display an image. The lens 25 is arranged such that the position of the secondary light source image 21a formed near the lens 24 and the position of the entrance pupil of the projection lens 28 have a substantially conjugate relationship.

Further, the lens 24 has a plurality of secondary light source images 21a.
The light fluxes from the respective light sources are collected and illuminated so as to overlap each other on the surface of the light valve 26, so that the illuminance on the surface of the light valve 26 becomes uniform.

In this embodiment, since the illumination range at the position of the light valve 26 is determined according to the focal length of the lens 24, the size of the reflecting mirror for appropriately deciding the focal length of the lens 24 and illuminating the entire area of the light valve 26. Can be changed. On the contrary, it is also possible to change the size of the light valve 26 by appropriately setting the focal length of the lens 24 for the reflecting mirror of a specific size.

In this embodiment, with the above-mentioned structure, the light valve surface is uniformly illuminated, and it is possible to observe a good projection image on the screen surface with little unevenness in illuminance between the central portion and the peripheral portion. In Example 5 of FIG. 6, as compared with Example 4 of FIG. 5, a cylindrical lens array (lenticular lens) extending in the direction perpendicular to the paper surface is used as the secondary light source image forming means 29, and a cylindrical lens is used as the lens 30. The other points are different, and the other configurations are the same.

The cylindrical lens array 29 forms a plurality of secondary light source images 29a extending in the one-dimensional direction (perpendicular to the paper surface) from the light source section S21 in the vicinity of the lens 30. The lens 25 is configured such that the secondary light source image 29a and the entrance pupil position of the projection lens 28 have a substantially conjugate relationship.

Further, the light fluxes from the plurality of secondary light source images 29a are condensed by the imaging lens S22 so as to overlap each other on the surface of the light valve 26 in the rectangular illumination range, and the surface is uniformly illuminated. is doing. Then, the projection original image on the light valve 26 is enlarged and projected on a screen (not shown) by a projection lens 28.

In the present embodiment, the cylindrical lens array 29 is used, the focal length and the like are appropriately set to limit the illumination range, and for example, quadrilateral illumination around the optical axis is possible.

In this embodiment, the same effect as that of the fourth embodiment is obtained with the above-mentioned structure.

In the sixth embodiment of FIG. 7, an ellipsoidal mirror is used as the reflecting mirror 22 as compared with the fourth embodiment of FIG. 5, the light emitting point of the light source 21 is arranged at one focus of the ellipsoidal mirror, and the other focus is provided. The incident surface 31a of the optical fiber bundle 31 is located. The difference is that a plurality of secondary light source images are formed on the exit surface 31b of the optical fiber 31, and the other configurations are the same.

In this embodiment, the light flux from the secondary light source image formed on the exit surface 31b of the optical fiber bundle 31 is focused on the imaging lens S.
The light is condensed at 22 and overlapped on the surface of the light valve 26 so that the surface is uniformly illuminated. Then, the projection original image on the light valve 26 is enlarged and projected on the screen surface (not shown) by the projection lens 28.

In this embodiment, instead of the ellipsoidal mirror, a rotary parabolic mirror and a lens system may be combined.

In this embodiment, by using the optical fiber bundle 31, the secondary light source image can be arranged at an arbitrary position without using a mirror or the like.

In the present embodiment, with the above-mentioned structure, the same effects as those of the fourth embodiment are obtained in addition to the above-mentioned effects.

FIG. 8 is a schematic view of the essential parts of the optical system of the seventh embodiment when the projection device according to the fourth embodiment of FIG. 5 is applied to a color liquid crystal projector device for a color liquid crystal light valve as a projection original image. .

In the figure, 26R, 26G and 26B are liquid crystal light valves for red, green and blue, respectively (image).
Is. Reference numerals 43 and 44 are total reflection mirrors, and 41 is a red reflection dichroic mirror. The total reflection mirror 43 and the lens 25 reflect red light of the light flux from the light source section S21.
The red liquid crystal light valve 26R is illuminated via R.

Reference numeral 42 denotes a green reflection dichroic mirror, which reflects the green light passing through the red reflection dichroic mirror 41 and illuminates the green liquid crystal light valve 26G via the lens 25G. The blue liquid crystal light valve 26B includes a red reflection dichroic mirror 41 and a green reflection dichroic mirror 42 of the light flux from the light source section S21.
And is illuminated with blue light passing through the lens 25B.

46 is a green reflection dichroic mirror, 45
Is a red and green transmissive dichroic mirror. The dichroic mirrors 45 and 46 are made of plane parallel plates having the same thickness, and each have a function as a combining mirror for combining images. A projection lens 28 projects the color image combined by the combining mirror 45 onto the screen surface (not shown).

In this embodiment, the white light from the light source section S21 is separated into three color lights of red, green and blue by the dichroic mirrors 41 and 42, and the red, green and blue colors are respectively separated by these color lights. Liquid crystal light valves 26R, 26
Illuminates G and 26B. Then, the liquid crystal light valves are optically combined by a combination mirror composed of dichroic mirrors 45 and 46, and projected on a screen surface (not shown) by a projection lens 28 to obtain a color image.

FIG. 9 is a schematic view of the essential parts of an optical system of Example 8 of the projection apparatus of the present invention.

In this embodiment, a case of a color liquid crystal projector device is shown as the projection device.

In the eighth embodiment of FIG. 9, 52R, 52G,
52B is a liquid crystal light valve (liquid crystal panel) for red, green and blue. 54A and 54B are total reflection mirrors, respectively, and 51 is a light source unit, which emits a collimated white light beam.

55A, 55B and 55Y are blue components (first
10B is a dichroic mirror having the spectral characteristics shown in FIG. 10A, and 55C and 55Z are the dichroic mirrors having the spectral characteristics shown in FIG. 10B that reflect only the red component (second color light). Is.

The dichroic mirror (first color light separating means) 55Y is provided on one surface of the plane-parallel plate, and the dichroic mirror (second color light separating means) 55Z is provided on the other surface. I am configuring.

(Note that the dichroic mirrors 55Y and 55Z provided on separate parallel plane plates may be superposed on each other to form the color separation member 50.) White light from the light source section 51 is a color separation member. The green light component transmitted by 50 and the reflected light component other than green light (blue light component and red light component) are separated.

The reflected light from the color separation member 50 is separated into a blue light component reflected by the dichroic mirror 55B and a red light component transmitted. The green light component transmitted through the color separation member 50 illuminates the green light liquid crystal panel 52G via the mirror 54A. The blue light reflected by the dichroic mirror 55B illuminates the blue liquid crystal panel 52B. The red light transmitted through the dichroic mirror 55B illuminates the red liquid crystal panel 52R.

Each of the liquid crystal panels 52R, 52G, by the dichroic mirror 55A and the dichroic mirror 55C.
The projected original image on 52B is optically combined, and the combined color original image is projected onto a screen surface (not shown) by a projection lens 53.
Is projected on.

In this embodiment, two dichroic films 55 are used.
By using the color separation member 50 in which Y and 55Z are combined, the green light component is separated and extracted from the white light,
As a result, three color lights having good spectral characteristics are obtained, and a projection image having a good color balance on the screen surface is obtained.

[0083]

As described above, according to the present invention, (2-1) when a projection lens is used to magnify and project a projection original image formed on a light valve whose transmission state changes depending on the presence or absence of a signal by illumination light, a light source By providing a secondary light source image forming means for generating a plurality of secondary light source images in the vicinity, and using this and a Schlieren optical system, it is possible to improve the light utilization efficiency and achieve a projection device that can obtain a bright projected image. it can.

(2-2) By using the secondary light source image forming means, a plurality of secondary light source images are generated from one light source at positions distant from the light valve, and the light from each secondary light source image is written. By overlapping and illuminating the bulb, it is possible to achieve a projection device which eliminates the illuminance unevenness on the light valve surface and obtains a projected image with a uniform illuminance on the screen.

(2-3) By appropriately setting the optical member on which the dichroic film for color separation is provided, it is possible to effectively project the projected image of the predetermined color light on the light valve with the color light having good spectral characteristics corresponding to each projection image. It is possible to achieve a projection device that is illuminated and can easily obtain a projection image with good color balance.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part of an optical system according to a first embodiment of the present invention.

FIG. 2 is a schematic view of a main part of an optical system according to a second embodiment of the present invention.

FIG. 3 is a schematic view of a main part of an optical system according to a third embodiment of the present invention.

FIG. 4 is a schematic view of a main part of an optical system of a conventional projection device.

FIG. 5 is a schematic view of a main part of an optical system according to a fourth embodiment of the present invention.

FIG. 6 is a schematic view of a main part of an optical system according to a fifth embodiment of the present invention.

FIG. 7 is a schematic diagram of a main part of an optical system according to a sixth embodiment of the present invention.

FIG. 8 is a schematic diagram of a main part of an optical system according to a seventh embodiment of the present invention.

FIG. 9 is a schematic view of a main part of an optical system according to Example 8 of the present invention.

10 is an explanatory diagram of spectral characteristics of the dichroic mirror of FIG.

FIG. 11 is a schematic view of a main part of a conventional color liquid crystal projector device.

FIG. 12: Ideal green reflection spectral characteristics

FIG. 13: Spectral characteristics of green reflection of an actual dichroic film

[Explanation of symbols]

1,21 White light source 2,22 Reflecting mirror 3,9,23 Secondary light source image forming means 4,5,24,25 Lens 6,26 Light valve 7,10 Light blocking member 8,28,53 Projection lens 11,31 Optical fiber Bundle S1, S21, S51 Light source section S2, S22 Imaging lens 26R, 26G, 26B Light valve 52R, 52G, 52B Light valve 43, 44, 54A, 52B Mirror 55A, 55B, 55Y Blue light reflection dichroic mirror 55C, 55Z Red Light reflection dichroic mirror

Claims (3)

[Claims] 1. A light source, a reflection means for reflecting the light from the light source, a light valve for controlling the light transmission state depending on the presence or absence of a signal to display an image, a projection means for projecting the image, and the light source. Secondary light source forming means for forming a plurality of secondary light source images from the section, an image forming lens for forming an image of the secondary light source image on the projection surface side of the light valve, and an image forming of the secondary light source image A projection apparatus using a Schlieren optical system having a light shielding member provided at a position substantially conjugate with respect to a lens and having an opening corresponding to the plurality of secondary light source images. 2. A secondary light source forming means is provided with a plurality of light sources from the light source portion.
A secondary light source image is formed, and each light flux from the plurality of secondary light source images is condensed by an imaging lens to be superposed on a light valve surface for displaying an image depending on the presence or absence of a signal. A projection device, characterized in that it is illuminated with light to illuminate the light valve surface, and an image displayed on the light valve is projected on a projection surface by a projection lens. 3. A light beam from a light source unit is separated into three color lights of first, second, and third color lights by a color separation system, and three projection images each having color information are illuminated by the three color lights, When the three projected images are combined and projected on the projection surface, the color separation system includes a first color light separating unit that reflects and separates the first color light, and a second color light that reflects and separates the second color light. A second color separation member having a separating unit, separating the first, second and third color lights from each other, and a third color separating unit reflecting and separating the first color light into a second color. A projection device using a disassembling member.