JP2007271769A - Projecting apparatus and projecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To project images that are brighter and more satisfactory in color balance, while simplifying a configuration. <P>SOLUTION: The projection apparatus comprises: a light source including a light source lamp 21 and a reflector 22; a color wheel 24 which has a plurality of dichroic filters separately disposed on a rotating face and inserts part of the rotating face into the optical path of the light source, and transmits color rays in a time division manner; an optical recycle loop 26 which recovers part of light CL reflected by the color wheel 24 and superimposes it on light OL transmitted through the color wheel 24; and a projecting system which projects a color image by forming optical images corresponding to the color rays in a time division manner by the use of light OL transmitted through the color wheel on which the part of the reflected light CL is superimposed by the optical recycle loop 26. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a projection apparatus and a projection method for projecting a color image.

  FIG. 5 shows a configuration of an optical system of a general projector apparatus. In the figure, a light source lamp 11 composed of a high-pressure mercury lamp or the like is disposed in a reflector 12. The light from the light source lamp 11 and the light emitted from the light source lamp 11 and reflected by the inner surface of the reflector 12 pass through a part of the color wheel 13 that is rotationally driven.

  For example, as shown in FIG. 6A, the color wheel 13 is formed by dividing fan-shaped dichroic filters of R (red), G (green), and B (blue) segments on the circumference and rotating them. By being driven, only the color component having the wavelength band of the dichroic filter inserted in the optical path from the light source side at that time is selectively transmitted.

  The light appropriately selected for each color component via the color wheel 13 is converted into a luminous flux having a cross-sectional shape and luminance density suitable for projection by the integrator 14 and then totally reflected by the mirror 16 via the light source side lens group 15. The light is applied to a spatial light modulator, for example, the micromirror element 17.

  The micromirror element 17 is also called DMD (Digital Micromirror Device) (registered trademark), and by performing a display operation for individually controlling on / off of each facing angle of a plurality of micromirrors arranged in an array, A binarized light image is instantaneously formed by the reflected light.

Accordingly, the rotation of the color wheel 13 and the light image formed by the micromirror element 17 are synchronized, and for example, when the R segment of the color wheel 13 is in the optical path, the color image of the red component is displayed on the micromirror element 17. Thus, when the color wheel 13 is rotated once, each color image of R, G, B is continuously displayed on the micromirror element 17, so that one full color image is projected as a result. The gradation expression is realized by adjusting the reflection time of the minimum mirror of each pixel constituting the micromirror element 17 during the period of displaying each color image.

  However, the optical image formed by the micromirror element 17 is formed on a screen surface to be projected (not shown here) via the projection lens group 18.

  Further, the color wheel 13 shown in FIG. 6 (A) is used instead of the segment-structured color wheel 13 'shown in FIG. 6 (B) because the projected image cannot obtain sufficient brightness. This is done on many devices.

  That is, the color wheel 13 ′ shown in FIG. 6B has a W (white (exactly transparent)) segment in addition to RGB, and the micromirror element 17 corresponds to each RGB color component accordingly. By displaying an image and an image corresponding to a Y (luminance) signal, the brightness especially when white is projected is improved.

Apart from this, the color wheel separates the white light from the illumination system into two color lights of different wavelength components in order to provide a small and low-cost color projection device with good color balance and light utilization efficiency. The color components of each color light are temporally changed by rotation, and the color light separated by the transmissive liquid crystal panel is modulated in accordance with the temporal change, and the color wheel is further modulated. A technique is conceivable in which a color image synthesized by a projection optical system is projected onto a screen. (For example, Patent Document 1)
JP-A-11-264953

  FIG. 7A is a graph showing the brightness for each color obtained by the projector apparatus using the color wheel 13 ′ having the configuration shown in FIG. 6B. In the same figure, “W”, “Y”, “C”, “G”, “M”, “R”, and “B” are “white (transparent)”, “yellow”, “cyan”, and “green”, respectively. “Green”, “Magenta”, “Red”, and “Blue”.

  Compared to the brightness of colors other than white, white forms a light image with a full gradation value by the micromirror element 17 during a period corresponding to all of the W, R, G, and B segments of the color wheel 13 '. Since projection is performed, it becomes very large.

Therefore, when colors other than white and white are projected at the same time, the colors other than white appear dark and turbid.
This means that by adding the transparent segment W, white in the projected image becomes brighter, but other colors become relatively darker, and as a result, the image quality is degraded.

  FIG. 7B shows the brightness of each color when the transparent wheel W is not used in the color wheel 13 ′ shown in FIG. In this case, white is obtained by forming a light image having a full gradation value by the micromirror element 17 during a period corresponding to each of the R, G, and B segments excluding the W segment of the color wheel 13 '. Although the color balance can be reproduced well, it becomes dark overall.

  This is because the light from the light source lamp 11 is not used for a period corresponding to the transparent segment W. Although not shown here, there is no transparent segment W shown in FIG. Even if each color is displayed by the color wheel 13, it becomes darker.

  Although the technique described in the above-mentioned patent document has no problem in terms of color balance and light utilization efficiency, the unit price for displaying an image corresponding to a given image signal and forming a light image is also a unit price. Therefore, it is difficult to say that a low-cost color projection apparatus is required.

  The present invention has been made in view of the above circumstances, and an object of the present invention is a projection apparatus capable of projecting a brighter and better-balanced image while simplifying the configuration as much as possible. To provide a projection method.

  According to the first aspect of the present invention, a light source and a plurality of dichroic filters that transmit colored light of different target wavelength bands are separately arranged on the rotation surface, and a part of the rotation surface is inserted in the optical path from the light source. A color wheel that transmits a plurality of color lights in a time-sharing manner, a recycle loop element that collects a part of the light reflected by the color wheel and superimposes it on the transmitted light of the color wheel, and a reflected light by the recycle loop element And projection means for projecting a color image by forming a light image corresponding to a plurality of color schools in a time-sharing manner using the transmitted light of the color wheel on which a part of the color wheel is superimposed.

  According to the present invention, a brighter image is projected by effectively using the light reflected by the color wheel without simplifying the configuration such as using a plurality of optical modulation elements and simplifying the configuration. It becomes possible.

(First embodiment)
Hereinafter, a first embodiment when the present invention is applied to a DLP (Digital Light Processing) (registered trademark) type projector apparatus will be described with reference to the drawings.

  FIG. 1 shows the configuration of the optical system of the projector apparatus according to the embodiment. In the figure, a light source lamp 21 composed of a high-pressure mercury lamp or the like is disposed in a reflector 22. The light from the light source lamp 21 and the light emitted from the light source lamp 21 and then reflected on the inner surface of the reflector 22 are converted into substantially parallel light through the light source side lens 23 and then rotated. To pass part of.

  As shown in FIG. 6A, the color wheel 24 is formed by dividing fan-shaped dichroic filters of R (red), G (green), and B (blue) segments on the circumference. As shown in FIG. 1, the rotation axis is inclined at an angle of 45 ° with respect to the optical axis from the light source side including the light source lamp 21.

  Therefore, each color dichroic filter is inserted into the optical path from the light source side, and the light source light is irradiated from an angle inclined by 45 ° toward the outer peripheral side from the direction in which the filter is orthogonal.

  Thus, the color light (hereinafter referred to as “target color light”) OL that has passed through the color wheel 24 is sent directly to the integrator 25.

  On the other hand, out of the light source light transmitted through the light source side lens 23, the color wheel 24 is out of the target wavelength range and cannot be transmitted, and is reflected (hereinafter referred to as “complementary light CL”). Is collected from the incident end 26 a of the light recycling loop 26.

For example, as shown in FIG. 2, the light recycling loop 26 is configured to have a substantially C-shape as a whole by combining two pairs of U-shaped glass rods 261 and 262.
Each of the U-shaped glass rods 261 and 262 is configured such that three prismatic glass rods are in contact with each other at an angle of 90 °, and the outside of each corner portion is chamfered at an angle of 45 ° to process a total reflection mirror. Is done.

  The complementary color light CL incident from the incident end 26a of the U-shaped glass rod 261 proceeds in the direction indicated by the arrow in each rod and is reflected twice by the total reflection mirror portion in the middle, and then the U-shaped glass. The light exits from the exit end 26 b of the rod 261.

  The emission end 26b of the U-shaped glass rod 261 and the incident end 26c of the U-shaped glass rod 262 are arranged to face each other, and the optical filter element 27 is arranged therebetween.

  The optical filter element 27 is an element that can electrically control (attenuate) the amount of transmitted light, specifically, a liquid crystal shutter mechanism, a mechanical shutter mechanism, an aperture stop mechanism, and a dimming rate arranged on a rotating peripheral surface. A neutral density filter wheel mechanism that selectively inserts one of a plurality of different neutral density filters into the optical path, and the like.

  The complementary color light CL whose transmitted light amount is intentionally attenuated by the optical filter element 27 is incident on the U-shaped glass rod 262 from the incident end 26c of the U-shaped glass rod 262. The light travels in the direction indicated by the arrow R, and is reflected twice by the total reflection mirror portion on the way, and then exits from the exit end 26d of the U-shaped glass rod 262.

  The incident end 26a of the U-shaped glass rod 261 and the exit end 26d of the U-shaped glass rod 262 are arranged so as to face each other, and as shown in FIG. 24 is disposed so as to be sandwiched between the front and back sides thereof, and the attenuated complementary color light CL emitted from the emission end 26d is projected onto the color wheel 24 at an angle of 45 °, and the integrator 25 together with the target color light OL. Is incident on.

  In the integrator 25, the target color light OL and the complementary color light CL are reflected on the inner peripheral surface of the integrator 25 and proceed through the integrator 25 while being appropriately superimposed.

  Accordingly, the light emitted from the integrator 25 in which the target color light OL and the complementary color light CL are superimposed and the luminance density is averaged is sent to a micromirror element that is a spatial optical modulation element (not shown). A light image corresponding to the color light is formed, and is projected and displayed on the screen to be projected by a projection lens group (not shown).

  Since the configuration related to the projection system after the integrator 25 is basically the same as that of a general DLP (registered trademark) projector device, illustration and description thereof will be omitted.

  In the above configuration, the complementary color light CL that is reflected by the color wheel 24 and is not originally used for projection is collected by the light recycling loop 26 and attenuated by the optical filter element 27 after being intentionally attenuated. The projection operation is executed by superimposing on the target color light OL that has passed through 24.

  The optical filter element 27 can electrically control the amount of transmitted light as described above, and the rotational position of the color wheel 24, more precisely, each R, G, B segment of the color wheel 24 is in the optical path from the light source. The amount of transmitted light is variably controlled in synchronism with the insertion timing.

  For example, when the optical filter element 27 is configured by a liquid crystal shutter mechanism, the display gradation is set to “white (all) by controlling the voltage applied to all the signal electrodes of the monochrome liquid crystal panel constituting the liquid crystal shutter mechanism. The amount of light transmitted can be adjusted by controlling between “transmission)” and “black (total shielding)”.

  When the optical filter element 27 is configured by a mechanical shutter mechanism, the mechanical shutter is opened at the start timing when the color segment is inserted into the optical path from the light source, and then the color segment is the light source. The amount of transmitted light can be adjusted by controlling the time until the mechanical shutter is closed while being inserted into the optical path from the center.

  Further, when the optical filter element 27 is configured by an aperture stop mechanism, the amount of transmitted light is adjusted by controlling the aperture aperture diameter while the color segment is inserted in the optical path from the light source. be able to.

  Further, when the optical filter element 27 is constituted by a neutral density filter wheel mechanism, the emission end 26b of the U-shaped glass rod 261 and the U-shaped glass while the segment of the color is inserted in the optical path from the light source. By controlling the attenuation rate of the neutral density filter located in the optical path between the incident ends 26c of the rods 262, the amount of light transmitted can be adjusted.

  As described above, after the complementary color light CL that is originally invalidated by reflection is collected, the amount of light is intentionally limited, and is superimposed on the target color light OL that has passed through the color wheel 24, and passes through the integrator 25. To execute the projection operation.

  Therefore, as the amount of the complementary color light CL attenuated by the optical filter element 27 is reduced and the proportion of the complementary color light CL superimposed on the target color light OL increases, the R, G, B segments constituting the color wheel 24 are increased. This deteriorates the performance of the dichroic filter and narrows the color reproduction range of the projected image.

  However, in particular, human eyes are more influenced by luminance than color, and in projector devices, brightness may be given priority over color reproducibility. Instead of sacrificing sex, a brighter image can be projected.

  FIG. 3A to FIG. 3C show the color-by-color obtained in the projection image when various display modes are set by controlling the transmission amount (attenuation amount) of the complementary color light CL through the optical filter element 27. The brightness is shown as a graph.

  3A shows the brightness of each color in the saturation priority mode, FIG. 3B shows the intermediate mode, and FIG. 3C shows the brightness of each color in the brightness priority mode. , Y ″) ”“ C (C ′, C ″) ”“ G (G ′, G ″) ”“ M (M ′, M ″) ”“ R (R ′, R ″) ”“ B (B ′ , B ″) ”are“ White ”,“ Yellow ”,“ Cyan ”,“ Green ”,“ Magenta ”,“ Red ”,“ Blue ”, respectively. Blue) ”.

  The saturation priority mode shown in FIG. 3A illustrates the case where the complementary color light CL is completely attenuated (shielded) by the optical filter element 27 or the attenuation rate is set as large as possible. It is assumed that the ratio of the complementary color light CL to be superimposed is suppressed as much as possible. Thus, an image having a color faithful to the original image signal is projected, and the brightness of the projected image is not much different from that of a general projector apparatus.

  On the other hand, in the brightness priority mode of FIG. 3C, the attenuation rate in the optical filter element 27 is set to the lowest, and the ratio of the complementary color light CL superimposed on the target color light OL is made sufficiently large. As a result, the reproducibility of the color of the original image signal is greatly reduced, resulting in an image with a light color that is close to a monochrome image, but the entire image is brighter and the contrast is high. A clear image can be projected.

  FIG. 3B is an intermediate between the above-described FIG. 3A and FIG. 3C, and can achieve a certain level of color reproducibility and brightness.

  As described above, it is possible to effectively use the complementary color light CL that is reflected by the color wheel 24 and is not originally used, while simplifying the configuration without using a complicated configuration such as using a plurality of optical modulation elements. This makes it possible to project a brighter image.

  Further, in the above-described embodiment, the color wheel 24 is arranged with the rotation axis inclined so that the optical axis from the light source is in contact with each dichroic filter at an angle of 45 °. The reflection of the light CL, the collection by the light recycling loop 26, and the superimposition on the target color light OL can be accurately controlled.

  In the above-described embodiment, the light recycling loop 26 is described as being configured by a plurality of glass rods. However, the present invention is not limited to this, and the entire inner peripheral surface is a hollow formed by a total reflection mirror. It is good also as what is comprised with the optical fiber bundle which bundles and comprises the light tunnel of this, and a some optical fiber.

  When the light tunnel is used, the configuration on the light source side can be reduced in weight, and when an optical fiber bundle is used, it can be bent and configured in a curved shape, thereby contributing to downsizing. .

  In the above embodiment, the target color light after passing through the color wheel 24 after adjusting the light amount (reduced light amount) with the optical filter element 27 with respect to the complementary color light CL collected by the color wheel 24 by the light recycling loop 26. Since the image is superimposed on the OL, the image quality of the image can be arbitrarily set according to the situation required by the user, such as when priority is given to color, brightness is given priority over color, or in the middle. You can choose.

  As such an optical filter element 27, specifically, one of a liquid crystal shutter mechanism, a mechanical shutter mechanism, an aperture stop mechanism, and a plurality of attenuating filters having different attenuation rates arranged on the rotating peripheral surface is disposed in the optical path. A light-reducing filter wheel mechanism that is selectively inserted into the optical filter element 27 can be considered, and in both cases, the amount of light transmitted through the optical filter element 27 can be accurately controlled to efficiently reduce light.

  Further, in the above embodiment, when a predetermined amount of light is superimposed on the target color light OL in the recycle loop 26, when performing light modulation with the spatial light modulator corresponding to the color of the light configured in time division. May not be controlled so as to be an image corresponding to R, G, B.

  For example, when the target light color OL is “red”, 30% of the light incident on the recycle loop 26 is superimposed, and when the target light color OL is “green”, 40% of the light incident on the recycle loop 26 is superimposed. When the target light color OL is “blue”, when 20% of the light incident on the recycle loop 26 is superimposed, the relationship between the target light color OL and the combined light superimposed on the recycled light is actually When the target color light OL is “red”, the composite light is “pink”, when the target color light OL is “green”, the composite light is “light blue”, and when the target color light OL is “blue”, the composite light is “light blue”. Therefore, it is possible to obtain a more natural and appropriate image by controlling the light modulation by the spatial light modulator so as to obtain an image corresponding to pink, light blue, and light blue.

(Second Embodiment)
A second embodiment in the case where the present invention is applied to a DLP (Digital Light Processing) (registered trademark) projector will be described below with reference to the drawings.

  FIG. 4 shows the configuration of the optical system of the projector apparatus according to the embodiment. In the figure, a light source lamp 31 composed of a high-pressure mercury lamp or the like is disposed in a reflector 32. The light from the light source lamp 31 and the light emitted from the light source lamp 31 and reflected on the inner surface of the reflector 32 are converted into substantially parallel light through the light source side lens 33 and then rotated to be driven. Reflected by a part of.

  The color wheel 34 is formed by dividing fan-shaped dichroic mirrors of R (red), G (green), and B (blue) segments on the circumference, and includes a light source lamp 31 as shown in FIG. The rotation axis is inclined at an angle of 45 ° with respect to the optical axis from the light source side.

  Accordingly, the dichroic mirrors of the respective colors are irradiated with the light source light at an angle inclined by 45 ° toward the outer peripheral side from the direction in which the mirrors are orthogonal to each other while being inserted in the optical path from the light source side.

  Accordingly, the color light (hereinafter referred to as “target color light”) OL reflected by the color wheel 34 is sent directly to the integrator 35.

  On the other hand, among the light source light transmitted through the light source side lens 33, the color wheel 34 is not reflected because it is out of the target wavelength range, and transmitted light (hereinafter referred to as “complementary color CL”). Is collected from the incident end 36 a of the light recycling loop 36.

The light recycling loop 36 is configured by combining, for example, two pairs of prism mirrors (penta prisms) 361 and 362 as illustrated.
The complementary color light CL reflected at an acute angle by the first prism mirror 361 is emitted from the emission end 36 b of the prism mirror 361.

  The exit end 36b of the first prism mirror 361 and the entrance end 36c of the second prism mirror 362 are disposed opposite to each other, and the optical filter element 37 is disposed therebetween.

  The optical filter element 37 is an element that can electrically control (attenuate) the amount of transmitted light, specifically, a liquid crystal shutter mechanism, a mechanical shutter mechanism, an aperture stop mechanism, and a dimming rate arranged on a rotating peripheral surface. A neutral density filter wheel mechanism that selectively inserts one of a plurality of different neutral density filters into the optical path, and the like.

  The complementary color light CL whose transmitted light amount is intentionally attenuated by the optical filter element 37 enters from the incident end 36c of the second prism mirror 362, is reflected at an acute angle, and then exits from the output end 36d.

  The exit end 36d of the second prism mirror 362 is disposed opposite to the entrance surface of the integrator 35 via the color wheel 34. The attenuated complementary color light CL emitted from the exit end 36d is the color wheel. 34 is projected at an angle of 45 °, passes therethrough, and enters the integrator 35 together with the target color light OL.

  In the integrator 35, the target color light OL and the complementary color light CL are reflected on the inner peripheral surface of the integrator 35 and proceed through the integrator 35 while being appropriately superimposed.

  Accordingly, the light emitted from the integrator 35 in which the target color light OL and the complementary color light CL are superimposed and the luminance density is averaged is sent to a micromirror element which is a spatial optical modulation element (not shown). A light image corresponding to the color light is formed, and is projected and displayed on the screen to be projected by a projection lens group (not shown).

  Note that the configuration relating to the projection system after the integrator 35 is basically the same as that of a general DLP (registered trademark) projector, and therefore illustration and description thereof will be omitted.

  In the configuration as described above, the complementary color light CL, which is originally not used for projection, transmitted by the color wheel 34 is collected by the light recycling loop 36 and is intentionally attenuated by the optical filter element 37, and then the color wheel. The projection operation is executed by superimposing the light on the target color light OL reflected by the lens 34.

  As described above, the optical filter element 37 can electrically control the amount of transmitted light, and the rotational position of the color wheel 34, more precisely, each R, G, B segment by the dichroic mirror constituting the color wheel 34 is determined. The amount of transmitted light is variably controlled in synchronization with the timing of insertion into the optical path from the light source.

  For example, when the optical filter element 37 is configured by a liquid crystal shutter mechanism, the display gradation is set to “white (all) by controlling the voltage applied to all the signal electrodes of the monochrome liquid crystal panel constituting the liquid crystal shutter mechanism. The amount of light transmitted can be adjusted by controlling between “transmission)” and “black (total shielding)”.

  Further, when the optical filter element 37 is configured by a mechanical shutter mechanism, the mechanical shutter is opened at the start timing when the color segment is inserted into the optical path from the light source, and then the color segment is the light source. The amount of transmitted light can be adjusted by controlling the time until the mechanical shutter is closed while being inserted into the optical path from the center.

  Further, when the optical filter element 37 is configured by an aperture stop mechanism, the amount of light transmitted is adjusted by controlling the aperture diameter of the aperture stop while the color segment is inserted in the optical path from the light source. be able to.

  Further, when the optical filter element 37 is configured by a neutral density filter wheel mechanism, the emission end 36b of the first prism mirror 361 and the second prism while the color segment is inserted in the optical path from the light source. The amount of transmitted light can be adjusted by controlling the attenuation rate of the neutral density filter located in the optical path between the incident ends 36c of the mirror 362.

  As described above, after the complementary color light CL that is originally invalidated by transmission is collected, the light amount is intentionally limited, and is superimposed on the target color light OL after being reflected by the color wheel 34, via the integrator 35. To execute the projection operation.

  Therefore, as the amount of the complementary color light CL attenuated by the optical filter element 37 is reduced and the proportion of the complementary color light CL superimposed on the target color light OL increases, the R, G, B segments constituting the color wheel 34 are increased. As a result, the performance of the dichroic mirror is deteriorated and the color reproduction range of the projected image is narrowed.

  However, in particular, human eyes are more affected by luminance than color, and in projector devices, brightness may be given priority over color reproducibility. Instead of sacrificing sex, a brighter image can be projected.

  As described above, it is possible to effectively use the complementary color light CL that is transmitted by the color wheel 34 and is not used, while simplifying the configuration without using a complicated configuration such as using a plurality of optical modulation elements. This makes it possible to project a brighter image.

  In the second embodiment, since the light recycling loop 36 is constituted by the two prism mirrors 361 and 362, it is constituted by the U-shaped glass rods 261 and 262 shown in the first embodiment. As compared with the optical recycling loop 26, it can be made more compact, contributing to cost reduction and downsizing of the entire apparatus.

  Further, in the above embodiment, when a predetermined amount of light is superimposed on the target color light OL in the recycle loop 26, when performing light modulation with the spatial light modulator corresponding to the color of the light configured in time division. May not be controlled so as to be an image corresponding to R, G, B.

  For example, when the target light color OL is “red”, 30% of the light incident on the recycle loop 26 is superimposed, and when the target light color OL is “green”, 40% of the light incident on the recycle loop 26 is superimposed. When the target light color OL is “blue”, when 20% of the light incident on the recycle loop 26 is superimposed, the relationship between the target light color OL and the combined light superimposed on the recycled light is actually When the target color light OL is “red”, the composite light is “pink”, when the target color light OL is “green”, the composite light is “light blue”, and when the target color light OL is “blue”, the composite light is “light blue”. Therefore, it is possible to obtain a more natural and appropriate image by controlling the light modulation by the spatial light modulator so as to obtain an image corresponding to pink, light blue, and light blue.

  Further, both the first and second embodiments are applied to a DLP (registered trademark) projector apparatus that uses a micromirror element as an optical modulation element for forming an optical image corresponding to an image signal. However, the present invention is not limited to this. The present invention is not limited to this, and a transmissive liquid crystal display panel, a reflective liquid crystal display panel including LCOS (Liquid Crystal On Silicon), or a GLV (Grating Light Value). A projection apparatus using any spatial light modulation element such as a G × L (registered trademark) element using a technology can be similarly applied as long as it uses an AC-driven discharge lamp as a light source. It becomes.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the functions executed in the above-described embodiments may be combined as appropriate as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination according to a plurality of disclosed structural requirements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the embodiment, if an effect is obtained, the configuration from which the constituent requirements are deleted can be extracted as an invention.

1 is a diagram showing a configuration of an optical system of a projector device according to a first embodiment of the present invention. The perspective view which illustrates the specific structure of the optical recycling loop which concerns on the same embodiment. The figure which illustrates the brightness for every projection color which concerns on the embodiment. The figure which shows the structure of the optical system of the projector apparatus which concerns on the 2nd Embodiment of this invention. The figure which shows the structure of the optical system of a general projector apparatus. The figure which shows the structure of the color wheel of FIG. The figure which illustrates the brightness for each projection color using the color wheel of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Light source lamp, 12 ... Reflector, 13, 13 '... Color wheel, 14 ... Integrator, 15 ... Light source side lens group, 16 ... Mirror, 17 ... Micromirror element, 18 ... Projection lens group, 21 ... Light source lamp, 22 ... Reflector, 23 ... Light source side lens, 24 ... (Dichroic filter) color wheel, 25 ... Integrator, 26 ... Light recycling loop, 26a, 26c ... Incoming end, 26b, 26d ... Outgoing end, 261,262 ... U-shaped glass Rod, 27 ... Optical filter element, 31 ... Light source lamp, 32 ... Reflector, 33 ... Light source side lens, 34 ... (Dichroic mirror) color wheel, 35 ... Integrator, 36 ... Light recycling loop, 36a, 36c ... Incident end, 36b , 36d ... emission end, 361, 362 ... prism mirror (penta Rhythm), 37 ... optical filter element, CL ... complementary color, OL ... object color light.

Claims (9)

A light source;
Multiple dichroic filters that transmit colored light in different target wavelength bands are divided and arranged on the rotating surface, and a part of the rotating surface is inserted in the optical path from the light source to transmit multiple colored lights in a time-sharing manner. Wheels,
Recycle loop means for superimposing the light reflected by the color wheel on the transmitted light of the color wheel;
Passing light amount adjusting means for adjusting the amount of light passing through the recycling loop means;
Projecting means for projecting a color image by forming a light image corresponding to a plurality of color lights in a time-sharing manner using the transmitted light of the color wheel on which a part of the reflected light is superimposed by the recycling loop means A projection apparatus characterized by that. A light source;
Multiple dichroic mirrors that reflect colored light in different target wavelength bands are divided and arranged on the rotating surface, and a part of the rotating surface is inserted in the optical path from the light source to reflect multiple colored lights in a time-sharing manner Wheels,
Recycle loop means for superimposing the light transmitted by the color wheel on the reflected light of the color wheel;
Passing light amount adjusting means for adjusting the amount of light passing through the recycling loop means;
Using the reflected light of the color wheel on which part of the transmitted light is superimposed by the recycling loop means, a light image corresponding to a plurality of color lights incident on the spatial light modulator is formed in a time-sharing manner to project a color image. A projection apparatus comprising: a projecting means for performing.   3. The projection apparatus according to claim 1, wherein the color wheel is disposed with an axis of rotation inclined so that an optical axis from the light source is in contact with each dichroic filter or dichroic mirror at an angle of about 45 degrees. .   The projection apparatus according to claim 1 or 2, wherein the recycling loop means includes at least one of a glass rod, a light tunnel, and an optical fiber bundle.   The passing light amount adjusting means selectively inserts one of a liquid crystal shutter mechanism, a mechanical shutter mechanism, an aperture stop mechanism, and a plurality of attenuating filters having different attenuation rates arranged on the rotating peripheral surface into the optical path. The projection apparatus according to claim 1, wherein the projection apparatus includes at least one of a neutral density filter wheel mechanism.   3. The projection apparatus according to claim 2, wherein the recycle loop means comprises a prism mirror element. The exchange light modulator forms a light image corresponding to colors other than the three primary colors in a time-sharing manner,
6. The projection apparatus according to claim 1, wherein the projection unit projects a light image formed in a time division manner by the spatial light modulator. A light source and a plurality of dichroic filters that transmit colored light of different target wavelength bands are divided and arranged on the rotation surface, and a part of the rotation surface is inserted in the optical path from the light source to generate a plurality of color lights in a time-division manner. A projection method with a projection device having a color wheel to transmit,
A recycling loop step of superimposing the light reflected by the color wheel on the transmitted light of the color wheel;
A passing light amount adjusting step for adjusting the passing light amount in the recycling loop step;
A projection step of projecting a color image by forming a light image corresponding to a plurality of color lights in a time-sharing manner using the transmitted light of the color wheel on which a part of the reflected light is superimposed in the recycling loop step. A projection method characterized by that. A light source and a plurality of dichroic mirrors that reflect colored light of different target wavelength bands are divided and arranged on the rotation surface, and a part of the rotation surface is inserted in the optical path from the light source to generate a plurality of color lights in a time division manner. A projection method for a projection apparatus having a color wheel for reflection,
A recycling loop step of superimposing the light transmitted by the color wheel on the reflected light of the color wheel;
A passing light amount adjusting step for adjusting the passing light amount in the recycling loop step;
Using the reflected light of the color wheel on which part of the transmitted light is superimposed in the recycling loop process, a light image corresponding to a plurality of color lights incident on the spatial light modulator is formed in a time division manner to project a color image. A projecting step for performing projection.

Images