JPH10142690A - Projecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the reduction of illuminating efficiency and easily provide a bright color projected image with uniform light quantity distribution and good color balance by guiding a part of a guided color light to a projecting lens through a mirror provided near an incident pupil, and shielding a part of the luminous flux guided to the projecting lens. SOLUTION: The light reflected by a liquid crystal panel 14 is converged by a flat convex lens 11, and reflected by a movable high reflecting mirror 16 provided within the pupil of a projecting lens 18. The light reflected by the high reflecting mirror (first reflecting mirror) 16 is guided to the projecting lens 18. Three light shielding members (diaphragms) 32, 39, 40 as correcting means for correcting the illuminance unevenness on a screen 19 surface are provided near the incident pupil of the projecting lens 18 in the optical path between the mirrors 16, 17 and the projecting lens 18. These light shielding members 32, 39, 40 are arranged near the incident pupil of the projecting lens 18 to limit the peripheral luminous fluxes of green light (G), blue light (B) and red light (R) passing the incident pupil, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection apparatus, and for example, displays an original projection image (color image) displayed on an image modulation element (also referred to as an optical modulation element) such as a liquid crystal panel (liquid crystal display element) on a screen surface. For example, the present invention is suitable for a color liquid crystal projector or the like that can observe a color image in an excellent state by appropriately setting each element of the projection apparatus when magnifying and projecting.

[0002]

2. Description of the Related Art Hitherto, various projection devices have been proposed in which a projection image original (image information) such as a film image or a liquid crystal light valve is enlarged and projected on a screen surface.

FIGS. 16A and 16B are Japanese Patent Application Laid-Open No. 4-428.
FIG. 1 is an overall view of a color liquid crystal projector proposed in Japanese Patent Application Laid-Open Publication No. H10-207, and a schematic diagram of a main part of a part thereof. In the figure, the liquid crystals 10, 11, and 12 are illuminated with R, G, and B light. The luminous flux from the liquid crystals 10, 11, and 12 illuminated with each color light is projected by the auxiliary lenses 13, 14, and 15 to the projection lens 3.
The light is focused near the zero entrance pupil EnP. The light beam from the auxiliary lens 14 is directly incident on the projection lens 30. The light beam from the auxiliary lens 13 is guided to the projection lens 30 via the mirror 40. The light beam from the auxiliary lens 15 is guided to the projection lens 30 via the mirror 41. The projection lens 30 projects an image displayed on each of the liquid crystals 10, 11, and 12 onto the screen 20.

FIG. 16 shows one principal ray Pr1, Pr2, Pr3 centered on each projection system.
FIG. 16 shows three principal rays each. The optical axis of the auxiliary lens 14 of the central projection system B matches the optical axis of the projection lens 30, and the auxiliary lenses 13 and 15 of the peripheral projection systems A and C.
Is perpendicular to the optical axis of the projection lens.

The entrance pupil EnP of the projection lens is located at the position where the optical axes of the three auxiliary lenses intersect, and the mirrors 40 and 4
Reference numeral 1 denotes an end point on the center side that coincides with the entrance pupil EnP, and forms an angle of 45 ° with the optical axis of the projection lens 30.

In the LCD, the central axis of the central projection system B is provided so as to coincide with the optical axis of the auxiliary lens 14, and in the peripheral projection systems A and C, the central axes thereof are set to the optical axes of the respective auxiliary lenses. Is provided to be shifted to the left in the figure relative to.

Accordingly, the principal ray Pr2 of the central projection system B is
The beam passes through the optical axis of the projection lens 30 and is perpendicular to the screen 20, and the principal rays Pr1 and Pr3 of the peripheral projection systems A and C.
Is oblique to the screen. The three chief rays intersect on the screen.

[0008]

The color liquid crystal projector shown in FIG. 16 combines three color lights with the entrance pupil EnP of the projection lens 30 and guides the light to the projection lens 30. The color balance on the screen 20 depends on the arrangement of the mirrors 40 and 41 provided on the entrance pupil EnP. For this reason, there is a problem that it is difficult to maintain good color balance on the screen surface unless the mirrors 40 and 41 are accurately arranged.

In general, in a projection device such as a color liquid crystal projector, the light amount distribution of each channel of red light (R light), green light (G light), and blue light (B light) on the projection surface is made uniform, and There was a problem that it was very difficult to maintain a good balance.

According to the present invention, when image information based on each color light light-modulated by an optical modulation element such as a liquid crystal panel is projected onto a predetermined surface by a projection lens, by appropriately setting each element of a projection system. It is an object of the present invention to provide a projection apparatus capable of easily obtaining a color projection image with a bright color balance and a uniform light amount distribution while preventing a decrease in illumination efficiency.

[0011]

According to the present invention, there is provided a projection apparatus comprising: (1-1) providing an optical modulation element for each of a plurality of color lights, illuminating the optical modulation element with each color light, and In the projection apparatus, the image information displayed on the projection lens is projected on a predetermined surface by a projection lens, and the color light from the image information is guided to the vicinity of the entrance pupil of the projection lens by a condenser lens provided for each color light. Guiding at least a part of the guided color lights to the projection lens via a mirror provided near the entrance pupil, and a light blocking member in an optical path between the mirror and the projection lens. It is characterized in that a part of the luminous flux guided to the projection lens is arranged and shielded.

In particular, (1-1-1) the light shielding members are provided for each color light from each of the image information.

(1-1-2) A plurality of mirrors are provided in the vicinity of the entrance pupil, and the light blocking member is provided for each of the plurality of mirrors.

(1-1-3) The plurality of light shielding members are provided to be inclined with respect to the optical axis of the projection lens.

(1-1-4) The plurality of light-shielding members are provided so as to be inclined with respect to the optical axis of the projection lens, and the opening shape of the light-passing area is formed as a part of an elliptical shape. The light beam is shielded.

(1-1-5) The plurality of light-shielding members are replaceable or displaceable so that the amount of each color light incident on the entrance pupil region of the projection lens is variable.

(1-1-6) A plurality of mirrors are provided near the entrance pupil, and the plurality of mirrors divide the entrance pupil in area.

(1-1-7) The light beam from the light source means is incident on the color separation means as parallel light by a reflection means.

(1-1-8) The color separation means is a diffraction grating.

(1-1-9) A positive lens having a convex surface facing the projection lens is provided in front of each of the image information.

(1-1-10) The convex surface of the positive lens on the projection lens side is formed of an aspherical surface having a shape such that the positive refractive power becomes weaker as the distance from the optical axis increases.

(1-1-11) The aspheric surface is a hyperboloid.
And so on.

(1-2) Each of the optical modulation elements provided for each color light is illuminated with the corresponding color light, and the corresponding color light is modulated by each optical modulation element to give image information. In a projection device that forms a color image by projecting color light onto a display surface via a projection lens, an entrance pupil of the projection lens or a projection lens for reflecting the color light from at least one optical modulation element and causing the color light to enter the projection lens. It is characterized by having a reflecting means provided in the vicinity thereof, and a correcting means for correcting uneven illuminance on the display surface of the color light reflected by the reflecting means.

In particular, (1-2-1) the correction means includes a light shielding member (light shielding plate or the like) or a light reducing member (ND filter or the like) provided between the reflection means and the projection lens.

(1-2-2) The correction means includes a dimming member (such as an ND filter) that gives unevenness in the amount of light to the color light illuminating the optical modulation element.

(1-2-3) The correction means includes a drive circuit for giving unevenness to the magnitude of a modulation signal (drive signal) of the optical modulation element. And so on.

(1-3) Each of the three optical modulation elements provided for each of the three primary color lights is illuminated with the corresponding color light, and the corresponding color light is modulated by each optical modulation element to give image information. In a projection device that forms a color image by projecting the color light from each optical modulation element onto a display surface via a projection lens, in order to reflect the color light from the first optical modulation element and make the color light incident on the projection lens, A first reflecting mirror provided at or near the entrance pupil of the projection lens, and a first reflecting mirror provided at or near the entrance pupil of the projection lens for reflecting the color light from the second optical modulation element and causing the light to enter the projection lens. The second
And a correcting means for correcting the uneven illuminance of the color light reflected by the first reflecting mirror on the display surface and the uneven illuminance of the color light reflected by the second reflecting mirror on the display surface. It is characterized by having.

In particular, (1-3-1) Furthermore, a third light source provided at or near the entrance pupil of the projection lens for reflecting the color light from the third optical modulation element and causing the light to enter the projection lens. The image processing apparatus further includes a reflecting mirror, and the correction unit also corrects uneven illuminance on the display surface of the color light reflected by the third reflecting mirror.

(1-3-2) The correction means includes a light-shielding member (light-shielding plate or the like) or a light-attenuating member (ND filter or the like) provided between the projection lens and the reflecting mirror.

(1-3-3) The correction means includes a dimming member for giving unevenness in the amount of light to the color light illuminating the optical modulation element.

(1-3-4) The correction means includes a drive circuit for giving unevenness to the magnitude of a modulation signal (drive signal) of the optical modulation element.

(1-3-5) The optical modulation element can be switched between a transmission mode and a non-transmission mode such as a scattering mode, and the modulation signal is a signal for setting the optical modulation element to the transmission mode. . And so on.

[0033] In addition, in the projection device of the constitution (1-2) or (1-3), (1-4-1) two light source devices for emitting each of the three primary colors are provided.

(1-4-2) It has a white light source and color separation means for decomposing light from the white light source to form the three primary color lights.

(1-4-3) The color separation means includes a diffraction grating.

(1-4-4) The color separation means includes a plurality of dichroic mirrors.

(1-4-5) The optical modulation element has a transmission type liquid crystal display element.

(1-4-6) The optical modulation element has a reflection type liquid crystal display element. And so on.

[0039]

1 to 4 are a side view, a back view, a top view, and a bottom view, respectively, of a main part of a first embodiment of the present invention. FIG. 5 to FIG. 8 are explanatory views of the optical action of the stop according to the present invention. FIG. 9 is an enlarged explanatory view of a part of the first embodiment of the present invention, and FIG. 10 is an explanatory view of a part of FIG.

In the drawing, white light emitted from a light source (light source means) 1 is reflected by a reflecting mirror (parabolic mirror) 2 to become a parallel light beam, and a plurality of color lights, for example, blue ( B), three colors of green (G) and red (R) (three primary colors)
And emitted at different angles. Light beams of three colors, which are color-separated at different angles by the diffraction grating 3, are condensed by the condenser lens 4 and reflected by the high reflection mirrors 5, 6, and 7. The light (blue light) reflected by the high reflection mirror 6 is emitted toward the plano-convex lens 11 via the high reflection mirror 8 and is a reflective blue liquid crystal panel 14 as an image modulation element (optical modulation element). Are illuminated with a parallel light beam.

The light (green light) reflected by the high reflection mirror 5 is emitted toward the plano-convex lens 10 and
A value of 0 illuminates the reflective green liquid crystal panel 13 as a parallel light flux. The (red light) reflected by the high-reflection mirror 7 is emitted through the high-reflection mirror 9 toward the plano-convex lens 12 to illuminate the reflection-type liquid crystal panel 15 for red. 32 is an aperture.

Next, the light reflected by the liquid crystal panel 14 is shown in FIG.
The light is condensed by the plano-convex lens 11 as shown in FIG.
The light is reflected by a movable high-reflection mirror 16 provided in the pupil 8. The light reflected by the high reflection mirror (first reflection mirror) 16 is guided to the projection lens 18. As a result, the original projected image displayed on the liquid crystal panel 13 is projected on the screen 19 by the projection lens 18. Similarly, the light reflected by the liquid crystal panel 15 is converted into a plano-convex lens 12 and a projection lens 18.
The light is guided to the projection lens 18 via a movable high reflection mirror (second reflection mirror) 17 provided near the entrance pupil.

Thus, the original projected image displayed on the liquid crystal panel 15 is projected on the screen 19 by the projection lens 18. Similarly, the original projected image displayed on the liquid crystal panel 13 is projected onto the screen 19 by the projection lens 18 via the plano-convex lens 10.

Here, the reflection type liquid crystal panels 13, 14, 1
In 5, image modulation (light modulation) according to each color is performed, so that color image information is projected on the screen 19.

In this embodiment, the positive lenses 10, 11, 12
The lens surface on the screen side is made convex so that the reflected light of the illumination light on the lens surface is diffused so that the reflected light hardly enters the entrance pupil of the projection lens 18, thereby reducing the occurrence of ghost.

As shown in FIG. 2, each of the mirrors 5, 6, and 7 has its entrance pupil surface near the entrance pupil of the projection lens 18 formed in a semicircular shape.
It is arranged in one area when divided.

The mirrors 16 and 17 are each provided with a projection lens 18.
When the entrance pupil plane near the entrance pupil is divided into two in a semicircle, the area of the entrance pupil is divided into a region opposite to the region where the mirrors 5, 6, and 7 are arranged on one side. Has been placed. The mirrors 16 and 17 constitute one element of the image synthesizing means. The mirrors 5 to 9 constitute one element of the color separation system.

The liquid crystal panels 13, 14, 15 are illuminated with a parallel light beam obliquely with respect to the optical axis of each of the condenser lenses 10, 11, 12, and the central ray of the light beam from each of the liquid crystal panels 14, 15 is reflected by a mirror 16 , 17 and the central ray from the liquid crystal panel 13 is made to directly enter the projection lens 18 from a semicircular region on one side of the entrance pupil in an oblique direction.

In the present embodiment, three light-shielding portions as correction means for correcting uneven illuminance on the screen 19 near the entrance pupil of the projection lens 18 in the optical path between the mirrors 16 and 17 and the projection lens 18. 32, 39, 4 of the member (aperture)
0 is provided. The light shielding members 32, 39, and 40 are each shown in FIG.
As shown in (1), it is disposed near the entrance pupil of the projection lens 18, and restricts the peripheral light fluxes of green light (G), blue light (B), and red light (R) passing through the entrance pupil.

The light shielding members 39 and 40 are inclined with respect to the optical axis 38 of the projection lens 18. Light shielding members 32, 39, 4
By appropriately setting the shape and arrangement position of 0, the passing state of the G, B, and R lights is adjusted so that the light amount distribution on the screen surface of each of the liquid crystal panels 13, 14, and 15 becomes uniform.
Also, the color balance is well maintained.

Next, the light shielding members 32, 3 according to the present embodiment
The optical action of 9, 40 will be described.

FIG. 5 is an explanatory diagram when the light shielding member is not provided for the liquid crystal panel 14, and FIG. 6 is an explanatory diagram when the light beam from the liquid crystal panel 14 enters the projection lens 18 when the light shielding member 39 is provided.

If the light shielding member 39 is not provided as shown in FIG.
The size of the image synthesizing mirror 16 to be viewed from the front changes. As a result, unevenness in the amount of light occurs on the screen 19 as a result.

In FIG. 5, when the angle A from which the mirror 16 for image synthesis is viewed from below on the paper surface of the liquid crystal panel 14 is compared with the angle B when viewed from above, the angle from which the mirror 16 is viewed from above is oblique. Is smaller than the angle A expected from the viewpoint. As a result, the upper side of the sheet of the liquid crystal panel 14 is darkly projected on the lower side of the sheet of the liquid crystal panel 14 on the screen 19.

On the other hand, in the present embodiment, as shown in FIG. 6, a light shielding member 39 is arranged between the mirror 16 for image composition and the projection lens 18 so that the lower mirror 16 of the liquid crystal panel 14 can be seen. Subtract the angle AA to get the angle AA
And the angle BB at which the mirror 16 on the upper side of the liquid crystal panel 14 is viewed is made equal. In FIG. 6, the stop 39 is arranged obliquely with respect to the optical axis 38 of the projection lens 18 to avoid vignetting in the optical path.

It should be noted that the light shielding member 40 is
The optical action when the light shielding member 39 is provided for the liquid crystal panel 14 described with reference to FIGS. 5 and 6 is the same as that when the light shielding member 39 is provided since both optical systems are substantially symmetric with respect to the optical axis 38. is there.

FIG. 7 is an explanatory diagram when the light shielding member is not provided for the liquid crystal panel 13, and FIG. 8 is an explanatory diagram when the projection lens 18 of the light beam from the liquid crystal panel 13 enters when the light shielding member 32 is provided.

If the light shielding member 32 is not provided as shown in FIG.
The size of the entrance pupil of the projection lens 18 as seen from the front varies. As a result, light quantity unevenness occurs on the screen 19.

In FIG. 7, when the angle C at which the projection lens 18 on the lower side of the paper of the liquid crystal panel 13 is viewed and the angle D at which the projection lens 18 at the upper side of the liquid crystal panel 13 is viewed are compared, the angle to be viewed is the upper angle D. The vignetting of the mirror 5 for introducing the illumination light is larger, and the expected angle is smaller. Therefore,
The upper side of the sheet of the liquid crystal panel 13 is darkly projected on the lower side of the sheet of the liquid crystal panel 13 on the screen.

Therefore, in this embodiment, as shown in FIG. 8, by disposing a light shielding member 32 between the projection lens 18 and the positive lens 10, the expected angle CC of the liquid crystal panel 13 with respect to the projection lens 18 on the lower side of the drawing is reduced. The angle CC is made equal to the expected angle DD on the upper side of the drawing. As described above, by restricting the light beam passing from below the liquid crystal panel 13, the image modulated by the liquid crystal panel 13 can be displayed on the screen 19.
The light is projected without unevenness on the top.

In the present embodiment, the shape of the opening of the light shielding members 39 and 40 on the light passing area side is such that the light shielding members 39 and 40 are arranged to be inclined with respect to the optical axis 38 of the projection lens 18. The ellipse is good so that it can be projected on a circle when viewed from the back side of.

In this embodiment, the light shielding members 32, 39, 40
May be replaced with another light-shielding member, or the position of the light-shielding member may be changed to change the size of the opening of the light beam restricted by the light-shielding members 32, 39, and 40. According to this, it is easy to adjust the color balance, and it is easy to easily correct the color variation of the diffraction grating or the dichroic mirror as the color separation means.

More specifically, the light shielding members 32, 39, 40
It is possible to easily adjust the amount of light of each color channel by shifting the position of attachment. Further, the three light shielding members may be integrated. This simplifies the configuration.

In this embodiment, a light-attenuating member (such as an ND filter) may be used instead of the light-shielding member as the correcting means. In the present embodiment, the correction means includes a drive circuit for giving unevenness to the modulation signals (drive signals) of the optical modulation elements (liquid crystal panels) 13, 14, and 15.

The liquid crystal panels 13, 14, 15 are preferably made of a reflective polymer dispersed liquid crystal (scattering mode) or a twisted nematic liquid crystal.

As described above, in this embodiment, a diffraction grating is used as a color separation means, and a plurality of mirrors 5 to 9, 16, 17 and a light shielding member 32, near the entrance pupil of the projection lens 18.
By appropriately arranging 39 and 40, the liquid crystal panels 13 to 15 of each color light are projected onto the screen 19 with high optical performance.

FIGS. 11 and 12 are a side view and a rear view of a main part of a second embodiment of the present invention. This embodiment is the first embodiment.
The only difference is that a reflection type diffraction grating 20 is used instead of a transmission type diffraction grating as a color separation diffraction grating, and the other configurations are the same.

In FIGS. 11 and 12, reference numeral 20 denotes a reflection type diffraction grating for color separation, which is a white light beam from the light source 1 and reflected by the reflecting mirror 2 for blue (B) and green (G) light. , Red (R), and is reflected and incident on the condenser lens 4. The structure after the condenser lens 4 is the same as that of the first embodiment. The reflection type diffraction grating has an advantage in that the depth of the grating groove can be made smaller than that of the transmission type diffraction grating, and it is easy to manufacture.

FIGS. 13 and 14 are a side view and a rear view of a main part of a third embodiment of the present invention. This embodiment is the first embodiment.
3 dichroic mirrors 21 and 2 having different arrangement angles instead of diffraction gratings as color separation means.
The only difference is that the color separation is performed using 2, 23, and the other configurations are the same.

In FIGS. 13 and 14, the white light from the light source 1 and reflected by the reflecting mirror 2 is sequentially reflected by dichroic mirrors 21, 22, and 23, and is sequentially reflected by blue (B), green (G), and red. The light is separated into three color lights (R) and is incident on the condenser lens 4 at different angles. The structure after the condenser lens 4 is the same as that of the first embodiment.

FIG. 15 is a top view of a main part of a fourth embodiment of the present invention. This embodiment is different from the first embodiment in that two dichroic mirrors 2 are used instead of a diffraction grating as color separation means.
4 and 25 are used separately, and transmissive liquid crystal panels 35, 36 and 37 are used in place of the reflective liquid crystal panel. Is the same.

The optical modulation element of the present embodiment can be switched between a transmission mode and a non-transmission mode such as a scattering mode, and the modulation signal is a signal for setting the optical modulation element in the transmission mode.

In FIG. 15, the white light emitted from the light source 1 becomes parallel light after being reflected by the parabolic mirror 2, of which blue light (B light) is emitted by the dichroic mirror 24.
Is reflected and incident on the mirror 26, the green light (G light) and the red light (R light) are transmitted therethrough, and the dichroic mirror 25
Incident on. Of the G light and the R light incident on the dichroic mirror 25, the R light is reflected and the G light is transmitted.

Thus, white light from the light source 1 is decomposed into three color lights. The B light reflected by the mirror 26 illuminates a transmission type image modulation element 37 via a reflection mirror 27. Similarly, the R light reflected by the dichroic mirror 26 illuminates a transmission type image modulation element 36 via reflection mirrors 28 and 29. The G image transmitted through the dichroic mirror 25 illuminates the transmissive image modulating element 35.

The G light image modulated by the transmission type image modulating element 35 is condensed on the entrance pupil of the projection lens 18 by the positive lens 10, and a part of the G light is restricted by the light shielding member 32. The image is projected on a screen 19 by 18.

B modulated by the transmission type image modulating element 36
The light image is condensed by the positive lens 11 on the reflecting mirror 16 disposed in the entrance pupil of the projection lens 18, is reflected by the reflecting mirror 16, and a part of the B light is restricted by the light blocking member 39. The image is projected on a screen 19 by 18. Similarly, the image of the R light modulated by the transmission type image modulating element 37 is condensed by the positive lens 12 on the reflecting mirror 17 arranged in the entrance pupil of the projection lens 18, reflected by the reflecting mirror 17, and After restricting a part of the R light at 40, the light is projected on the screen 19 by the projection lens 18.

In the present embodiment, image synthesis of three color images is performed by two reflecting mirrors 16 and 17 disposed in the entrance pupil.

The light shielding member 39 (40) is connected to the mirror 16 (1
7) and the projection lens 18, and the light blocking member 32 is provided between the positive lens 10 and the projection lens 18 to restrict the passing light beam for each color light, and the liquid crystal panels 35, 36, 37
Of the light amount (color unevenness) on the surface of the screen 19 is reduced.

When the present embodiment is applied to a transmission type (transmission mode) image modulating element, the shape of the positive lenses 10, 11, and 12 is the same as that of the projection lens 1 in order to reduce the occurrence of distortion.
It is preferable to form a convex-convex lens having a convex shape on the eight side.

The three optical modulation elements 35, 36 and 37 may be illuminated with light beams from light source means provided independently of each other.

In each embodiment of the present invention, the entrance pupil of the projection lens 18 is moved by moving the image synthesizing mirrors 16 and 17 in a direction oblique to the optical axis of the projection lens 18, for example, at 45 degrees. May be freely changed. According to this, it is possible to freely change the light intensity of each color, and it becomes easy to adjust the color balance with a small loss of the light amount as a whole.

[0082]

As described above, according to the present invention, when projecting image information based on each color light light-modulated by an optical modulator such as a liquid crystal panel onto a predetermined surface by a projection lens, By appropriately setting the elements, it is possible to achieve a projection device that can easily obtain a bright color balance image with a bright color balance with a uniform light amount distribution while preventing a decrease in illumination efficiency.

[Brief description of the drawings]

FIG. 1 is a side view of a main part according to a first embodiment of the present invention.

FIG. 2 is a rear view of a main part according to the first embodiment of the present invention;

FIG. 3 is a top view of a main part according to the first embodiment of the present invention;

FIG. 4 is a bottom view of a main part according to the first embodiment of the present invention.

FIG. 5 is an explanatory diagram of an optical action of the light shielding member according to the present invention.

FIG. 6 is an explanatory diagram of an optical action of the light shielding member according to the present invention.

FIG. 7 is an explanatory diagram of an optical action of the light shielding member according to the present invention.

FIG. 8 is an explanatory diagram of an optical action of the light shielding member according to the present invention.

FIG. 9 is a perspective view of a main part of a part of the first embodiment of the present invention.

FIG. 10 is an explanatory view of a part of FIG. 9;

FIG. 11 is a side view of a main part of the second embodiment of the present invention.

FIG. 12 is a rear view of a main part according to the second embodiment of the present invention;

FIG. 13 is a side view of a main part of a third embodiment of the present invention.

FIG. 14 is a rear view of a main part according to the third embodiment of the present invention.

FIG. 15 is a schematic diagram of a main part of a fourth embodiment of the present invention.

FIG. 16 is a schematic view of a main part of a conventional color liquid crystal projector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light source 2 Parabolic mirror 3 Diffraction grating 4 Condensing lens 5-9,16,17 Reflecting mirror 10-12 Positive lens 13-15 Reflection type image modulation element 18 Projection lens 19 Screen 21-25 Dichroic mirror 35-37 Transmission Type image modulator

Claims (28)

[Claims] An optical modulator is provided for each of a plurality of color lights, the optical modulator is illuminated with each color light, and image information displayed on the optical modulator is superimposed on a predetermined surface by a projection lens. In the projection device for projecting, the color light from each of the image information is guided to the vicinity of the entrance pupil of the projection lens by a condenser lens provided for each color light, and at least a part of the color light of the guided color light is converted to the color light. Light is guided to the projection lens through a mirror provided in the vicinity of the entrance pupil, and a light shielding member is arranged in an optical path between the mirror and the projection lens to partially transmit a light beam guided to the projection lens. A projection device, which is shielded from light. 2. The projection apparatus according to claim 1, wherein said light shielding member is provided for each color light from said image information. 3. The projection apparatus according to claim 1, wherein a plurality of said mirrors are provided near said entrance pupil, and said light blocking member is provided for each of said plurality of mirrors. 4. The projection device according to claim 2, wherein the plurality of light shielding members are provided to be inclined with respect to an optical axis of the projection lens. 5. The light shielding member is provided so as to be inclined with respect to the optical axis of the projection lens, and shields the light beam so that the opening shape of the light beam passage area is part of an elliptical shape. 4. The projection device according to claim 3, wherein: 6. The light-shielding member according to claim 1, wherein the plurality of light-shielding members are exchangeable or displaceable so as to change the amount of each color light incident on an entrance pupil region of the projection lens. The projection device according to claim 1. 7. The apparatus according to claim 1, wherein a plurality of mirrors are provided near the entrance pupil, and the plurality of mirrors divide the entrance pupil in area. Item 3. The projection device according to Item 1. 8. The projection apparatus according to claim 1, wherein a light beam from said light source means is incident on said color separation means as parallel light by a reflection means. 9. The projection apparatus according to claim 1, wherein the color separation unit is a diffraction grating. 10. The projection device according to claim 1, wherein a positive lens having a convex surface facing the projection lens is provided in front of each of the image information. 11. The projection apparatus according to claim 10, wherein the convex surface of the positive lens on the side of the projection lens is formed of an aspherical surface having a positive refractive power that becomes weaker as the distance from the optical axis increases. 12. The projection apparatus according to claim 11, wherein said aspheric surface is a hyperboloid. 13. An optical modulation element provided for each color light is illuminated by the corresponding color light, and the corresponding color light is modulated by each optical modulation element to give image information, and the color light from each optical modulation element is projected. In a projection device that forms a color image by projecting the image on a display surface via a lens, an entrance pupil of the projection lens or its vicinity is provided to reflect color light from at least one optical modulation element and make the color light incident on the projection lens. A projection apparatus, comprising: a reflection unit provided; and a correction unit that corrects uneven illuminance of the color light reflected by the reflection unit on the display surface. 14. The apparatus according to claim 13, wherein said correction means includes a light shielding member (light shielding plate or the like) or a light reducing member (ND filter or the like) provided between said reflection means and said projection lens. Projection device. 15. The projection apparatus according to claim 13, wherein said correction means includes a dimming member (for example, an ND filter) that gives uneven light amount to the color light illuminating the optical modulation element. 16. The projection apparatus according to claim 13, wherein said correction means includes a drive circuit for giving a variation in the magnitude of a modulation signal (drive signal) of said optical modulation element. 17. Illuminating each of the three optical modulation elements provided for each of the three primary color lights with the corresponding color light, modulating the corresponding color light with each optical modulation element to give image information,
In a projection apparatus that forms a color image by projecting the color light from each of the optical modulation elements onto a display surface via a projection lens, in order to reflect the color light from the first optical modulation element and make the color light enter the projection lens A first reflecting mirror provided at or near the entrance pupil of the projection lens, and at the entrance pupil of or at the vicinity of the projection lens in order to reflect the color light from the second optical modulation element and cause the light to enter the projection lens. The second reflector provided, and corrects the uneven illuminance on the display surface of the color light reflected by the first reflector and the uneven illuminance of the color light reflected by the second reflector on the display surface. A projection device comprising a correction unit that performs correction. 18. A projector according to claim 18, further comprising a third reflecting mirror provided at or near an entrance pupil of said projection lens for reflecting color light from a third optical modulation element and causing said light to enter said projection lens. 18. The projection apparatus according to claim 17, wherein the correction unit corrects uneven illuminance on the display surface of the color light reflected by the third reflecting mirror. 19. The light-shielding member (light-shielding plate or the like) provided between each of the projection lens and the reflecting mirror.
19. The projection device according to claim 17, further comprising a dimming member (ND filter or the like). 20. The projection apparatus according to claim 17, wherein said correction means includes a dimming member for giving unevenness in the amount of color light illuminating said optical modulation element. 21. The projection apparatus according to claim 17, wherein said correction means includes a drive circuit for giving a variation in the magnitude of a modulation signal (drive signal) of said optical modulation element. 22. The optical modulation element, wherein the optical modulation element can be switched between a transmission mode and a non-transmission mode such as a scattering mode, and the modulation signal is a signal for setting the optical modulation element in a transmission mode. Item 22. The projection device according to Item 16 or 21. 23. The light source device according to claim 13, further comprising two light source devices for emitting each of the three primary colors.
3. The projection device according to any one of 2. 24. The apparatus according to claim 13, further comprising: a white light source; and a color separation unit configured to separate the light from the white light source to form the three primary color lights. Projection device. 25. The projection apparatus according to claim 24, wherein said color separation means includes a diffraction grating. 26. The projection apparatus according to claim 24, wherein said color separation means includes a plurality of dichroic mirrors. 27. The projection apparatus according to claim 13, wherein the optical modulation element has a transmission type liquid crystal display element. 28. The projection apparatus according to claim 13, wherein said optical modulation element has a reflection type liquid crystal display element.