JPH08140106A - Projector device - Google Patents

Abstract

PURPOSE: To improve use efficiency of light by forming illumination light which circularly color-changes with two different colors and emitting it in different directions. CONSTITUTION: The emitted light of a light source 2 is made incident on a filter part which is vertically provided at the peripheral part of a two color transmission color wheel 21 through a condenses lens 3 at the angle of 45 degrees. At this point, only light flux L2 having the same color as the peripheral filter reaches a reflection mirror M1, other color light flux reaches a filter disk part which is concentric with the wheel 21 and light flux 3L having the same color reaches a reflection mirror M5. Since the colors of the peripheral filter and the filter disk are made different, the light fluxes of two colors can simultaneously be guided to the other directions and light can be used twice. Thus, the heights of respective optical paths are varied by making the light fluxes incident on mirror reflection-type light bulbs 7a and 7b from obliquely upper and lower directions through the reflection mirrors M2 and M5. Then, the intensity distribution of light in a projected picture can be made uniform by projecting the picture on a screen center from a position being a rotary object.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial Application Conventional Technology (FIGS. 6 and 7) Problem to be Solved by the Invention (FIGS. 8 to 10) Means for Solving the Problem (FIGS. 1 and 2) Operation (FIGS. 1 and 2) ) Example (FIGS. 1-5) Effect of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector device, and is particularly suitable for application to a projector device adapted to project a color image.

[0003]

2. Description of the Related Art Conventionally, red light has been used as a projector device.
Green light and blue light have a fast cycle (for example, about 180 [Hz])
There is a light source device that sequentially and cyclically emits light.
In this type of projector device, the reflected or transmitted light modulating means is modulated with image data and projected on an image display surface such as a screen while corresponding to the color of the light source light which cyclically changes in a fast cycle. As a result, the display image is recognized as one dynamic color image.

Further, an optical spatial modulator (hereinafter referred to as a specular reflection type light valve) in which minute movable mirror surface elements are arranged in a plane is proposed (Japanese Patent Laid-Open No. 60-179781). (Kaihei 3-40693 and JP-A-3-174112)
. In projector devices that project color images using this specular reflection type light valve, red,
A rotating color wheel is used to separate the blue and green.

In FIGS. 6 and 7, reference numeral 1 indicates an example of a projector device as a whole. The projector device 1 emits a light beam from a projection light source 2 and irradiates the total reflection mirror 4 via a condenser lens 3. The light flux incident on the total reflection mirror 4 is reflected and is irradiated onto the reflection mirror 5. At this time, between the total reflection mirror 4 and the reflection mirror 5,
A color wheel 6 that sequentially switches to red light, green light, and blue light is provided. The light flux reflected by the reflecting mirror 5 illuminates the specular reflection type light valve 7 from diagonally below, enters the projection lens 9 via the relay lens 8, and is projected on a screen (not shown).

[0006]

By the way, as the color wheel 6 of the projector device 1, as shown in FIG.
While rotating the filter disk 13 in which the red, green, and blue color filters 10, 11, and 12 are arranged at equal angles as shown in (A) and (B) at a predetermined speed using a motor (not shown). The color wheel 14 or the like that is irradiated with the light source light L1 from one surface side is used. This color wheel 1
Reference numeral 4 is adapted to emit the transmitted light of the filter disk 13 which is sequentially switched to red light, green light and blue light.

However, in the projector device using the specular reflection type light valve, in order to separate red, blue and green, the color wheel 14 as described above is used.
To use. Therefore, the light utilization rate becomes 1/3. In addition, there is a problem in that the colors are visually recognized when the user moves his / her head, and the eyes are burdened by visually recognizing the color separation.

Further, the specular element of the specular reflection type light valve used in the projector device has a quadrangular shape and has a hinge in a diagonal direction. FIG. 9 shows an example of arrangement of mirror elements.
Shown in (A) and (B). The mirror surface element allows light from the light source to be incident from obliquely downward or obliquely upward and reflects the reflected light so as to enter the opening of the projection lens. For example, as shown in FIG. 10, since light is projected onto the specular element, a brightness distribution is generated in the specular element. In addition, accordingly, there is a problem in that brightness distributions that are not horizontal, vertical, and non-rotational objects to the projected image occur.

The present invention has been made in consideration of the above points, and an object thereof is to propose a projector device having a high effective utilization rate of light and a high image quality.

[0010]

In order to solve the above problems, according to the present invention, the illumination light (L1) incident from the light source (2) changes its color sequentially and cyclically in two different colors at the same time. 1st and 2nd color illumination light (L2, L
3), the color illumination light generating means (21) for emitting in different directions, and the light modulator having a plurality of light modulation elements arranged according to the pixels of the image data, to the first color illumination light. (L2) is irradiated, and the light modulator is modulated by the image data corresponding to the color of the first color illumination light (L2),
A first light modulation projection optical means (7a) for projecting effective reflected light according to the image data on the image display surface, and an optical modulator having a plurality of light modulation elements arranged according to the pixels of the image data, The second color illumination light (L3) is irradiated, and the light modulator is modulated by the image data corresponding to the color of the second color illumination light (L3), and the effective reflected light corresponding to the image data is imaged. The second light modulation projection optical means (7b) for projecting on the display surface is provided.

[0011]

The color illuminating light generating means (21) allows the illuminating light (L1) incident from the light source (2) to sequentially and cyclically change two different colors at the same time. The color illumination lights (L2, L3) are formed and emitted in different directions, and the first light modulation projection optical means (7a) causes a plurality of light modulation elements arranged according to the pixels of the image data to be formed. The light modulator having the first color illumination light (L2) is irradiated, and the light modulator is modulated by the image data corresponding to the color of the first color illumination light (L2), and the light modulator is modulated according to the image data. The effective reflected light is projected onto the image display surface, and by the second light modulation projection optical means (7b), the second light modulation projection optical means (7b) is provided to the light modulator having a plurality of light modulation elements arranged corresponding to the pixels of the image data. The second color illumination light (L3) is emitted while the second color illumination light (L3) is emitted. And by connexion modulated video data corresponding to the color, by projecting the effective reflected light corresponding to the video data to the video display surface, the effective utilization rate and the image quality of the light to be enhanced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 and 2 in which parts corresponding to those in FIGS. 6 and 7 are designated by the same reference numerals, 20 indicates a projector device as a whole. The projection device 20 includes a projection light source 2, a condenser lens 3, specular reflection type light valves 7a and 7b, relay lenses 8a and 8b, reflecting mirrors M1 to M7, projection lenses 9a and 9b, and a two-color transmission color wheel 21. It consists of

The light beam emitted from the projection light source 2 is incident on the reflecting mirror M1 through the condenser lens 3. 2 between the condenser lens 3 and the reflecting mirror M1.
A color transmission color wheel 21 is provided. At this time, when the light flux enters the two-color transmission color wheel 21, a part of the light flux is reflected.

The light beam L2 transmitted through the two-color transmission color wheel 21 is reflected by the reflecting mirrors M1 and M2, and enters the specular element of the specular reflection type light valve 7a from diagonally above. After this, the projection lens 9a enlarges and projects it onto a screen (not shown) through the relay lens 8a and the reflecting mirrors M3 and M4. Further, the light flux L3 reflected by the two-color transmission color wheel 21 is reflected by the reflecting mirror M5 and enters the specular element of the specular reflection type light valve 7b from obliquely below. After that, the projection lens 9b is enlarged and projected on a screen (not shown) through the relay lens 8b and the reflecting mirrors M6 and M7.

Here, the specular reflection type light valves 7a and 7b.
Is 17 [μ, depending on the array of pixels (for example, 768 × 576) for one screen (one frame) of video data.
A plurality of minute mirror surface elements of about [m] angle are arranged to form a reflecting surface having a size of about 1/2 inch CCD (solid-state image sensor). The mirror surface element is arranged corresponding to each memory cell of the frame memory according to the array of pixels of the video data, and the inclination state of the corresponding mirror surface element is changed individually according to the state of each memory cell. ing.

Practically, each mirror element tilts by + 10 ° as shown in FIG. 3A when the memory cell is in the on state, that is, effective as a pixel with respect to the neutral state, and conversely, the memory cell is in the off state, that is, the pixel. 3 when it is invalid as
As shown in (B), it is designed to be tilted by -10 °. As a result, the reflected light reflected by the mirror surface with respect to the incident light is switched so as to have an optical path difference of 20 ° between the effective reflected light necessary for forming an image and the invalid reflected light that is ineffective.

As shown in FIGS. 4 (A) and 4 (B), the two-color transmission color wheel 21 in this embodiment has a disc-shaped filter disk portion 22 and a filter disk portion 22 in which color filters of three colors are arranged every 120 degrees. And part 23. The filter portion 23 is formed by a cylindrical color filter that extends uniformly from the circumferential portion of the filter disk portion 22 toward the incident side of the light flux, and is a color that transmits a different color light from the filter of the adjacent filter disk portion 22. Filters are arranged.
Further, as can be seen from the sectional view of the two-color transmission color wheel 21 shown in FIG. 4B, the filter disk portion 22 and the filter portion 23 are arranged vertically.

In this embodiment, the specular reflection type light valves 7a and 7b to the projection lens 9 are used.
It is arranged so that the respective optical paths to a and 9b are equidistant.
At the arrangement position of the specular reflection type light valves 7a and 7b, the specular reflection element of the specular reflection type light valve 7a, which is irradiated with incident light from obliquely above, is more than the optical path of the light emitted from the projection light source 2. The specular element of the specular reflection type light valve 7b, which is arranged at a low position and is irradiated with incident light from obliquely below, is arranged at a position higher than the optical path of the light emitted from the projection light source 2. The projection lenses 9a and 9b are screens (not shown).
The image is projected from these positions and is combined on the screen. In this case, the brightness is increased and the intensity distribution of light can be made closer to a uniform direction (FIG. 5A).

In the above structure, the light flux emitted from the projection light source 2 passes through the condenser lens 3,
It is incident on the two-color transmission color wheel 21. The incident light at this time is filtered by the filter unit 23 of the two-color transmission color wheel 21.
Is illuminated at an angle of 45 degrees. At this time, of the emitted light, only the light flux L2 of the same color as the color filter emitted by the filter unit 23 is emitted to the reflecting mirror M1. The light beams of other colors are reflected from the filter unit 23 to the filter disk unit 22, and only the light beam of the same color as the color filter of the irradiated filter disk unit 22 is applied to the reflecting mirror M5. At this time, the color filters irradiated by the light fluxes of the filter disk unit 22 and the filter unit 23 are filters of different colors, so that the light fluxes of two colors can be simultaneously guided in the other direction.

The light beam L2 that has passed through the two-color transmission color wheel 21 is reflected by the reflecting mirrors M1 and M2, and enters the specular element of the specular reflection type light valve 7a from diagonally above.
In addition, the luminous flux L reflected by the two-color transmission color wheel 21
3 is reflected by the reflecting mirror M5 and enters the specular element of the specular reflection type light valve 7b from diagonally below. At this time, in the specular reflection type light valves 7a and 7b, only the specular element corresponding to the pixel having the same color component as the color of the incident light with which the reflecting surface is irradiated is turned on, and the incident light is partially reflected in the optical path direction. .

The respective reflected lights of the luminous flux reflected in the optical path direction by the specular reflection type light valves 7a and 7b go straight along the optical paths, and the relay lens 8a and the reflecting mirror are provided on the specular reflection type light valve 7a side. The projection image is enlarged and projected from a projection lens 9a onto a screen (not shown) via M3 and M4. On the side of the specular reflection type light valve 7b, a screen (not shown) is provided from the projection lens 9b through the relay lens 8b and the reflecting mirrors M6 and M7.
The projection image is enlarged and projected, and the two projected images are combined.

According to the above configuration, the projector device 2
In order to project a color image of 0, by using a two-color transmission color wheel 21 composed of a filter disk unit 22 and a filter unit 23, the light emitted from an angle of 45 degrees is separated and the remaining light is re-generated. By separating, two colors of light can be extracted at the same time, and thus the light can be effectively used twice. Also, specular reflection type light valves 7a and 7b
The height of each optical path is made different by irradiating the incident light from diagonally above and diagonally below, and by projecting the image from the position that is subject to rotation with respect to the center of the screen, the light intensity distribution of the projected image is It is almost uniform.

In the above-described embodiment, the two-color transmission color wheel 21 in which the cylindrical filter portion 23 is arranged vertically on the circumference of the circular filter disk portion 22 is used. Although described, the present invention is not limited to this, in the circumferential portion of the circular filter disk portion,
A two-color transmission color wheel in which the positional relationship between the filter disk portion and the filter portion is not vertical may be used, such as a skirt-shaped filter portion. In this case, 2 at the same time
The angle between the filter disk portion and the filter portion and the incident angle of the light flux are set so that two color lights can be obtained.

In the above embodiment, the two-color transmission color wheel 21 has three color filters 120 each.
Although the color filters are arranged every 60 degrees, the present invention is not limited to this, and the color filters of three colors may be sequentially arranged every 60 degrees.

Further, in the above-described embodiment, two specular reflection type light valves 7 in which the hinge directions of the specular elements are the same.
Although the one using a and 7b has been described, the present invention is not limited to this, and two specular reflection type light valves in which the hinge direction of the specular element is to be rotated may be used. in this case,
By projecting an image from a target position horizontally or vertically on the screen and combining them, a light intensity distribution of the projected image as shown in FIG. 5B can be obtained.

[0027]

As described above, according to the present invention, the illumination light incident from the light source forms two color illumination lights whose colors sequentially and cyclically change in two different colors at different times, and the illumination lights have different directions. The use efficiency of light can be improved by using the color illuminating light generating means that emits light. For this reason, the user sees the projected image of two colors at the same time, and thus it is possible to prevent visually recognizing the color separation. Further, by projecting an image from a target position with respect to the center of the image display surface and synthesizing the images, the light intensity distribution of the projected image becomes substantially uniform, and the image quality can be improved.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing the overall configuration of a projector device according to an embodiment of the present invention.

FIG. 2 is a schematic side view showing the configuration of the projector device of FIG. 1 as seen from the side surface.

FIG. 3 is a schematic diagram showing a configuration of a specular element provided in a specular reflection type light valve.

FIG. 4 is a schematic diagram showing a configuration of a two-color transmission color wheel.

FIG. 5 is a schematic diagram showing a light intensity distribution by combining projected images.

FIG. 6 is a schematic plan view showing the overall configuration of a conventional projector device.

7 is a schematic side view showing the configuration of the projector device of FIG. 6 as seen from the side surface.

FIG. 8 is a schematic diagram showing a configuration of a conventional color wheel.

FIG. 9 is a schematic diagram illustrating an example of an array of mirror surface elements.

FIG. 10 is a schematic diagram showing an incident light on a mirror surface element and a light intensity distribution.

[Explanation of symbols]

1, 20 ... Projector device, 2 ... Projection light source, 3 ... Condenser lens, 4 ... Total reflection mirror, 5, M1-M7 ... Reflection mirror, 6, 14 ... Color wheel, 7, 7a , 7b ... Specular reflection type light valve,
8, 8a, 8b ... Relay lens, 9, 9a, 9b ...
Projection lens, 10, 11, 12 ... color filter, 13 ... filter disk, 21 ... 2-color transmission color wheel, 22 ... filter disk part, 23 ...
Filter part.

Front page continuation (72) Inventor Junichi Iwai 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (5)

[Claims] 1. Color illumination light that forms first and second color illumination light whose colors sequentially and cyclically change in two different colors at the same time from the illumination light incident from a light source, and emits in different directions. The first color illumination light is applied to a light modulator having a generation unit and a plurality of light modulation elements arranged according to pixels of the image data, and the light modulator is used to emit the first color illumination light. A first light modulation projection optical unit that modulates the image data according to the color of the image data and projects effective reflected light according to the image data onto the image display surface; A light modulator having a plurality of light modulation elements is irradiated with the second color illumination light, and the light modulator is modulated by the image data corresponding to the color of the second color illumination light. Projects effective reflected light according to the above image data on the image display surface That projector apparatus characterized by comprising a second light modulation optical projection means. 2. The first and second light modulation projection optical means respectively include first and second relay lens means for focusing the effective reflected light on a predetermined position, and a center of an image display surface, respectively. The projector device according to claim 1, further comprising first and second projection lens means for projecting the effective reflected light from a position symmetrically displaced with respect to the first and second projection lens means. 3. The projector device according to claim 1, wherein the light modulation element is a specular deflection type spatial light modulation element that reflects incident light. 4. The first and second color illumination lights formed by the color illumination light generating means are formed so that three colors corresponding to three color components are sequentially and cyclically changed. The projector device according to claim 1, wherein: 5. The color illumination light generating means includes a first three-color filter in which three color filters corresponding to three color elements are sequentially formed on a circumferential surface, and the first three-color filter. A second three-color filter in which three color filters corresponding to the three elements of the above colors are sequentially formed on the peripheral side surface of the skirt portion integrally formed on the circumferential portion of the first and second And a half mirror formed corresponding to the color filter of the three-color filter, irradiating the illumination light from the light source from the inside of the skirt shape to the first or second three-color filter, and Folding back with a half mirror to irradiate the second or first three-color filter, and integrally rotating the first and second three-color filters to form the first and second color illumination light. The projector device according to claim 1, wherein: