JP2006163281A - Projector device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector device having a color separating polygon mirror for continuously separating light emitted from a light source, in time division. <P>SOLUTION: White light emitted from a light source lamp 1 is made into a luminous flux of approximately parallel rays by a parabolic reflector 2 or the like and is shaped by a rectangular aperture 3 or the like and is condensed only in one direction by a condenser optical system 4 comprising one or two plano-convex cylinder lenses (4a and 4b) and is made incident on a prismatic color filter 11. Reflected light from an optical modulator 7 successively irradiated with three primary colors from the prismatic color filter 11 is imaged on a screen by a projection lens 8, and a deflecting scan unit like a galvano mirror 9 or the like for rotating a plane mirror forward and backward is used in order to convert a one-dimensional image formed by the optical modulator 7 to a two-dimensional image or convert a slender image to a normal rectangular image. A luminous flux emitted from the projection lens 8 is turned back toward the screen and scans on the screen, by the deflecting scan unit. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector device, and more particularly to a projector device having a color separation polygon mirror that continuously time-divides light emitted from a light source.

  As a light modulation element used to form an image in a projector that projects a TV image or a personal computer output onto a screen, there are a transmissive liquid crystal panel, a reflective micromirror element, and the like. In the liquid crystal panel, the density, that is, the light transmittance or reflectance changes according to the pattern of the output image. The micro mirror element changes the angle of the micro mirror according to the pattern of the image to be output, changes the reflection direction of each pixel, and adds brightness to each pixel of the reflected image incident on the projection lens. A shade is formed.

  Generally, in a liquid crystal panel and a micromirror element used in a projector, a number of pixels necessary for image formation, that is, a liquid crystal cell and a minute mirror are two-dimensionally arranged. DMD is known as a micromirror element in which micromirrors are arranged two-dimensionally.

  These light modulation elements generate an entire image at a time by arranging pixels in a two-dimensional manner. However, in order to obtain high image quality, it is necessary to increase the number of pixels, and there are problems such as an increase in the optical system and an increase in cost due to manufacturing problems.

  On the other hand, a projector device that forms a desired two-dimensional image on a screen by arranging pixels one-dimensionally or elongated and scanning a generated one-dimensional or elongated image with a deflection scanning device such as a galvanometer mirror. is there.

  The following two methods are known as a method of projecting a color image with a projector.

  One is a light source that divides the light path for each of the three primary colors (red, green, and blue) by a color separation optical system consisting of a plurality of prisms and other white light sources such as lamps, and modulates the light corresponding to each color The element is irradiated, and each color image is synthesized by a color synthesizing optical system including a plurality of prisms, and then projected on a screen.

  The other is a white light source such as a lamp that rotates a disk-shaped color filter (color wheel, color disk, etc.) and splits it into three primary colors in a time-sharing manner, and sequentially irradiates each light to one light modulator. Then, the light of each color transmitted or reflected by the light modulation element is projected onto the screen as it is. Images of each color are sequentially projected on the screen, but are observed as a color image in which the colors are synthesized by visual accumulation.

  The present invention relates to a projector apparatus in which a white light source is divided into three primary colors in a time-sharing manner, and each color is sequentially irradiated onto a light modulation element in which pixels are one-dimensionally arranged or elongated. A basic configuration of a projector using a generally known one-dimensional reflective light modulation element is shown in FIGS.

  FIGS. 27 to 29 respectively show a cross-sectional view, a plan view, and a perspective view of a projector using a one-dimensional reflective light modulation element. The light emitted from the light source lamp 1 is converted into a substantially parallel light beam by the parabolic reflector 2, etc., shaped by the rectangular aperture 3, etc., and by one to two plano-convex cylinder lenses (4a, 4b), etc. The light is condensed in only one direction by the condenser optical system 4 and is irradiated with a light modulation element 7 in which pixels are arranged one-dimensionally or elongated. A disc-shaped color filter 5 is disposed between the condenser optical system 4 and the light modulation element 7.

  The reflected light from the light modulation element 7 irradiated with the three primary colors sequentially by the rotation of the color filter 5 is imaged on the screen by the projection lens 8, but a one-dimensional image formed by the light modulation element 7 is formed. In order to make a two-dimensional image or an elongated image into a normal rectangular image, a deflection scanning unit such as a galvanometer mirror 9 that reciprocally rotates a plane mirror is used. The light beam emitted from the projection lens 8 is folded back in the screen direction by the deflection scanning unit and simultaneously scans on the screen. Although the screen is not shown, it is in the right direction in FIG. 27, and the light beam from the projection lens 8 is scanned on the screen in the vertical direction in FIG. 27 by the reciprocating rotation of the galvanometer mirror 9.

  As shown in FIGS. 30 and 31, each of the color filters 5 is composed of portions (5a, 5b, 5c) that transmit any one of red, green, and blue, and is rotated by the drive motor 6, Color separation in a time division manner.

  Patent Document 1 proposes a projector device capable of obtaining a high-quality image capable of displaying a high accuracy and sufficient halftone even though the number of parts is small.

  In Patent Document 2, a light-transmitting substrate having at least fixed light-transmitting regions of a plurality of color separation filters is attached to a motor so that it can be rotationally driven, thereby reducing wind noise and reducing rotational unevenness with a simple configuration. Discs and video display devices using the same have been proposed.

  In Patent Document 3, in a color wheel composed of a disk-shaped color filter divided into a plurality of color regions and a motor that rotates the color filter, the position of the disk-shaped color filter can be accurately determined even at high speeds and high temperatures. A color wheel capable of detection has been proposed.

  In Patent Document 4, it is possible to set a high time aperture ratio of the spatial light modulation element without increasing the size of the apparatus and regardless of the size and state of the light emitter, thereby achieving high color purity and high efficiency. There have been proposed an image display device capable of performing color sequential display and a projection type image display device using the image display device.

  In Patent Document 5, in order to reduce the size of a projector, an annular color filter is used to form a monochromatic image of three colors sequentially in a frame, and the reflector is arranged inclined at the center thereof and the reflected light of the reflector is received. There has been proposed a projector that is provided with a reflection type image element and a projection lens and projects it onto a projection screen.

In Patent Document 6, if the main body side is an operation mode that reduces the consumption of driving energy, the attached accessory device and the interchangeable lens side are also set to an operation mode that reduces the consumption of driving energy, thereby realizing energy saving driving as a system. Accessory devices, interchangeable lenses, and camera systems that can be used have been proposed.
JP 2001-174775 A JP 2001-281562 A JP 2001-337390 A JP 2001-131687 A JP 2000-28960 A JP 2000-171893 A

  However, the above invention has the following problems.

  In the projector using the one-dimensional or elongate array of light modulation elements 7, as shown in FIGS. 30 and 31, only a narrow range 10 of the color filter 5 is used. However, since the range 10 to be used becomes longer in one direction depending on the pixel arrangement direction of the light modulation elements, it is necessary to sufficiently increase the outer diameter of the disk-shaped color filter.

  The present invention reduces the number of parts required for a projector device by using a deflection scanning unit having a color separation function instead of the conventional disk-shaped color filter, thereby reducing the size and reducing the cost of the projector device. The purpose is to propose.

  The invention according to claim 1 is a light source that emits white light, a light collecting unit that collects light emitted from the light source to form a substantially single light beam, a light modulation element that modulates the light beam, and the light modulation. In a projector apparatus having a projection lens that projects the luminous flux modulated by an element onto a screen, the luminous flux formed by the light converging means is incident on a rotating columnar color separation filter and dispersed in a time division manner. Features.

  According to a second aspect of the present invention, in the projector device according to the first aspect, the columnar color separation filter is characterized in that an incident surface and an output surface of the light beam are flat.

  According to a third aspect of the present invention, in the projector device according to the first aspect, the columnar color separation filter is characterized in that an incident surface and an output surface of the light beam are arcs.

  According to a fourth aspect of the present invention, in the projector device according to the third aspect, the projection device has a concave surface having the same curvature as the incident surface of the columnar color separation filter on which the light beam is incident, and the incident surface of the light beam is a flat surface. A first columnar prism, and a first columnar prism having a concave surface having the same curvature as the emission surface of the columnar color separation filter from which the light beam is emitted, and the light emission surface being a flat surface. The first columnar prism and the second columnar prism are respectively disposed close to an incident surface and an output surface of the columnar color separation filter.

  According to a fifth aspect of the present invention, in the projector device according to any one of the first to fourth aspects, the surface of the columnar color separation filter comprises an absorption type filter that absorbs light having a wavelength other than a specific wavelength. And

  According to a sixth aspect of the present invention, in the projector device according to any one of the first to fourth aspects, the surface of the columnar color separation filter reflects light having a specific wavelength and transmits light having a wavelength other than the specific wavelength. It is characterized by comprising a reflective filter.

  According to a seventh aspect of the present invention, in the projector device according to any one of the first to sixth aspects, the columnar color separation filter divides into three primary colors of red, blue, and green.

  According to an eighth aspect of the present invention, there is provided a light source that emits white light, a light collecting unit that collects light emitted from the light source to form a substantially single light beam, a light modulation element that modulates the light beam, and the light modulation. In a projector apparatus having a projection lens that projects the light flux modulated by an element onto a screen, the light flux formed by the light converging means is incident on a rotating cylindrical color separation filter and dispersed in a time division manner. It is characterized by.

  According to a ninth aspect of the present invention, in the projector device according to the eighth aspect, the cylindrical color separation filter is characterized in that an incident surface and an output surface of the light beam are flat.

  According to a tenth aspect of the present invention, in the projector device according to the eighth aspect, the cylindrical color separation filter is characterized in that an incident surface and an output surface of the light beam are arcs.

  According to an eleventh aspect of the present invention, in the projector device according to any one of the eighth to tenth aspects, the cylindrical color separation filter emits the luminous flux into the cylinder and the cylinder. An incident surface on which the speed of light again enters the cylindrical color separation filter is flat.

  A twelfth aspect of the present invention is the projector device according to any one of the eighth to tenth aspects, wherein the cylindrical color separation filter is emitted into the cylinder and an emission surface that emits the luminous flux into the cylinder. An incident surface on which the speed of light again enters the cylindrical color separation filter is an arc.

  A thirteenth aspect of the present invention is the projector device according to any one of the eighth to twelfth aspects, wherein the surface of the cylindrical color separation filter is composed of an absorptive filter that absorbs light other than a specific wavelength. Features.

  According to a fourteenth aspect of the present invention, in the projector device according to any one of the eighth to twelfth aspects, the surface of the cylindrical color separation filter reflects light having a specific wavelength and emits light having a wavelength other than the specific wavelength. It is characterized by comprising a reflective filter that transmits.

  According to a fifteenth aspect of the present invention, in the projector device according to any one of the eighth to fourteenth aspects, the cylindrical color separation filter divides into three primary colors of red, blue, and green.

  According to the present invention, reflected light from a light modulation element, which is sequentially irradiated with three primary colors from a columnar color filter having a plane of incidence and exit plane of a light beam emitted from a light source, is incident on the projection lens. The light beam emitted from the projector is folded in the screen direction by the deflection scanning unit, and at the same time, the entire projector device can be reduced in size by scanning the screen.

  The configuration and operation of an embodiment to which the present invention is applied will be described below.

[First Embodiment]
1 and 2 show a plan view and a perspective view of a projector apparatus using a columnar color filter (hereinafter referred to as a columnar color filter) 11 according to the present embodiment. The white light emitted from the light source lamp 1 becomes a substantially parallel light beam by the parabolic reflector 2, etc., shaped by the rectangular aperture 3, etc., and by one to two plano-convex cylinder lenses (4a, 4b), etc. The condenser optical system 4 is configured to collect light in only one direction and enter the columnar color filter 11. The reflected light from the light modulation element 7 irradiated with the three primary colors sequentially from the columnar color filter 11 is imaged on the screen by the projection lens 8. A deflection scanning unit such as a galvanometer mirror 9 that reciprocally rotates a plane mirror is used to make an image or an elongated image into a normal rectangular image. The light beam emitted from the projection lens 8 is folded back in the screen direction by the deflection scanning unit and simultaneously scanned on the screen. Although the screen is not shown, it is in the right direction in FIG. 1, and the light beam from the projection lens 8 is scanned on the screen in the vertical direction in FIG.

  Here, a specific structure and operation of the columnar color filter on which the light beam condensed in the condenser optical system 4 is incident will be described with reference to FIGS.

  As shown in FIG. 3, the columnar color filter 11 in the present embodiment is rotated by the drive device 12 around the axis 14 of the columnar color filter 11 as a rotation axis. As shown in FIG. 4, the columnar color filter 11 in this example has surfaces (13a, 13b, 13c) that transmit each of R, G, and B colors. The white light A incident on the incident surface 13a that transmits R exits from the exit surface 13a 'as R monochromatic light. White light B and C incident on the incident surfaces (13b, 13c) that transmit G and B are emitted from the emission surfaces (13b ′, 13c ′) as monochromatic light of G and B, respectively.

  As the columnar color filter 11 in this embodiment, the most common red (R), green (G), and blue (B) three primary colors are used, but two or more colors are used. The same applies in principle to the one that performs the spectroscopy. In this embodiment, the columnar color filter 11 is a hexahedron. However, since the reflecting surface only needs to be a multiple of the number of colors, a multiple of 6, for example, a dodecahedron columnar shape, may be used for color separation into three primary colors. good.

  Color filter members that select the wavelength of light to be transmitted include an absorption type and a reflection type.

  The absorption filter is made by mixing a transparent medium such as a glass plate or a film with a material that absorbs only light of a specific wavelength, and transmits light other than the wavelength that the material absorbs. The absorption filter can be manufactured at a relatively low cost and can be easily joined to other optical members. Specifically, it is made by sticking an absorption filter member to the surface of the reflecting member. In addition to the advantage of being a rotary polygon mirror with color selectivity, there is an advantage that the manufacturing cost is reduced because of the absorption filter.

  Reflective filters are made by depositing multiple thin films with different refractive indexes and thicknesses on a transparent substrate such as glass, and reflect only light of a specific wavelength, while transmitting light of other wavelengths. To do. When using transmitted light, it is also called a “dichroic filter”, and when using reflected light, it is also called a “dichroic mirror”. The reflective filter can be a color filter with excellent wavelength selectivity by optimizing the combination of thin films. Specifically, it is made by vapor-depositing a multilayer thin film having color selectivity on the surface of the reflecting member. In addition to the advantage of being a rotary polygon mirror having color selectivity, there is an advantage of excellent wavelength selectivity.

  FIG. 5 shows the incident surface of the columnar color filter 11. Since the columnar entrance surface of the columnar color filter 11 has a shape close to the range 10 that is actually used, it is compared with the range 10 (shown in FIGS. 30 and 31) that is actually used for the conventional disk-shaped color filter. However, there is little waste and the unit can be miniaturized.

  White light refers to light that includes a plurality of monochromatic lights such as red (R), green (G), and blue (B), and has a wider wavelength range than monochromatic light. A color filter is an optical element that allows white light to enter and selectively emits monochromatic light such as R, G, and B. The separation of white light into monochromatic light selectively includes color separation and spectroscopy. Call.

  Further, an example in which processing such as polishing and forming of the surface is facilitated by making the incident surface and the exit surface of the columnar color filter 11 flat will be described with reference to FIGS.

  As shown in FIG. 7, in the cross-sectional shape perpendicular to the rotation axis 14 of the columnar color filter 11, the part forming the entrance surface and the exit surface is a straight line. In this example, the outer shape of the cross section is a regular hexagon. As a result, the entrance surface and the exit surface become rectangular flat surfaces, and the occurrence of optical aberrations when passing through the columnar color filter 11 can be suppressed. In general, since flat surfaces are easy to process, cost reduction can be expected. In this embodiment, the columnar color filter 11 is a hexahedron. However, it is sufficient that the incident surface and the emission surface are paired for each color, and a multiple of 6, for example, a dodecahedron columnar shape may be used in the case of color separation into three primary colors. .

  Further, by making the incident surface and the exit surface of the columnar color filter 11 into cylindrical curved surfaces, the wind noise is suppressed and the columnar color filter 11 has the effect of a convex cylinder as a condenser optical system. The structure will be described with reference to FIGS.

  As shown in FIG. 9, in the cross-sectional shape perpendicular to the rotation axis 14 of the columnar color filter 11, the part forming the entrance surface and the exit surface is an arc. As a result, the incident surface and the exit surface become convex cylinder surfaces, and the columnar color filter 11 acts as a cylinder lens to converge the transmitted light flux. For this reason, at least one or all of the convex cylinder lenses (4a, 4b) constituting the condenser optical system 4 shown in FIG. 1 or 2 can be omitted. Alternatively, the power (refractive power) of each convex cylinder lens (4a, 4b) can be weakened with the number of convex cylinder lenses as it is. Further, the columnar color filter 11 having a polygonal cross section shown in FIGS. 6 and 7 generates a so-called “wind noise” during high-speed rotation, but the columnar color filter having the circular cross section shown in FIGS. 11, wind noise is less likely to occur. The columnar color filter 11 shown in FIGS. 8 and 9 is a perfect cylinder, but it is sufficient that at least the entrance surface and the exit surface are arcs. A portion other than the portion used as the exit surface may be a flat surface.

  Next, a columnar color filter that has no power and can completely suppress the occurrence of aberration and optical path shift by combining a cylindrical rotating color filter and a fixed lens of a plano-concave cylinder is shown in FIGS. And 12, will be described.

  As shown in FIG. 10, when the light beam from the light source is incident at an angle with the incident surface, the thickness of the columnar color filter 11 causes an optical path shift (step) between the incident light beam and the emitted light beam. When illuminating the light modulation element 7, the light path shift is not particularly a problem because it irradiates a range sufficiently wider than the width of the arranged pixels. However, when the shift amount is large, it is necessary to irradiate a wide range as it is, and the efficiency of the illumination light amount is reduced. For this reason, a smaller shift amount is desirable.

  Therefore, as shown in FIGS. 11 and 12, columnar prisms (15a, 15b) having concave surfaces and planes having substantially the same curvature as the outer shape of the columnar columnar color filter 11 are placed close to the entrance surface side and the exit surface side. Arrange. As a result, the entire unit of the columnar color filter 11 has no power, so that aberration and movement of the imaging position due to the color filter hardly occur. In addition, since both the entrance surface and the exit surface are flat and the angle with respect to the light beam can always be kept vertical, there is no optical path shift after transmission.

[Second Embodiment]
13 and 14 are a plan view and a perspective view of a projector device using a cylindrical color filter (hereinafter, referred to as a cylindrical color filter) 11 according to the present embodiment. The white light emitted from the light source lamp 1 becomes a substantially parallel light beam by the parabolic reflector 2, etc., shaped by the rectangular aperture 3, etc., by one to two plano-convex cylinder lenses (4a, 4b), etc. The condenser optical system 4 is configured to collect light in only one direction and enter the cylindrical color filter 11. The reflected light from the light modulation element 7 irradiated with the three primary colors sequentially from the cylindrical color filter 11 is imaged on the screen by the projection lens 8. A deflection scanning unit such as a galvanometer mirror 9 that reciprocally rotates a plane mirror is used to make a two-dimensional image or an elongated image into a normal rectangular image. The light beam emitted from the projection lens 8 is folded back in the screen direction by the deflection scanning unit and simultaneously scanned on the screen. Although the screen is not shown, it is in the right direction of FIG. 13, and the light beam from the projection lens 8 is scanned on the screen in the vertical direction of FIG.

  Here, a specific structure and operation of the cylindrical color filter on which the light beam condensed in the condenser optical system 4 is incident will be described with reference to FIGS.

  As shown in FIG. 15, the cylindrical color filter 11 in the present embodiment is rotated by the drive device 12 around the axis 14 of the cylindrical color filter 11 as a rotation axis. As shown in FIG. 16, the cylindrical color filter 11 in this example has surfaces (13a, 13b, 13c) that transmit R, G, and B colors. The white light A incident on the incident surface 13a that transmits R exits from the exit surface 13a 'as R monochromatic light. White light B and C incident on the incident surfaces (13b, 13c) that transmit G and B are emitted from the emission surfaces (13b ′, 13c ′) as monochromatic light of G and B, respectively.

  As the cylindrical color filter 11 in the present embodiment, one that divides into the most common three primary colors of red (R), green (G), and blue (B) is used. However, two or more colors are used. In principle, the same applies to the case of the spectroscopic analysis. In the present embodiment, the cylindrical color filter 11 is a hexahedron, but the reflecting surface only needs to be a multiple of the number of colors. Therefore, when the color separation is performed into three primary colors, a multiple of 6, for example, a dodecahedron columnar shape. But it ’s okay.

  Color filter members that select the wavelength of light to be transmitted include an absorption type and a reflection type.

  The absorption filter is made by mixing a transparent medium such as a glass plate or a film with a material that absorbs only light of a specific wavelength, and transmits light other than the wavelength that the material absorbs. The absorption filter can be manufactured at a relatively low cost and can be easily joined to other optical members. Specifically, it is made by sticking an absorption filter member to the surface of the reflecting member. In addition to the advantage of being a rotary polygon mirror with color selectivity, there is an advantage that the manufacturing cost is reduced because of the absorption filter.

  Reflective filters are made by depositing multiple thin films with different refractive indexes and thicknesses on a transparent substrate such as glass, and reflect only light of a specific wavelength, while transmitting light of other wavelengths. To do. When using transmitted light, it is also called a “dichroic filter”, and when using reflected light, it is also called a “dichroic mirror”. The reflective filter can be a color filter with excellent wavelength selectivity by optimizing the combination of thin films. Specifically, it is made by vapor-depositing a multilayer thin film having color selectivity on the surface of the reflecting member. In addition to the advantage of being a rotary polygon mirror having color selectivity, there is an advantage of excellent wavelength selectivity.

  FIG. 17 shows the incident surface of the cylindrical color filter 11. Since the columnar incident surface of the cylindrical color filter 11 has a shape close to the range 10 that is actually used, the range 10 (shown in FIGS. 30 and 31) of the conventional disk-shaped color filter is actually used. In comparison, there is little waste and the unit can be miniaturized.

  White light refers to light that includes a plurality of monochromatic lights such as red (R), green (G), and blue (B), and has a wider wavelength range than monochromatic light. A color filter is an optical element that allows white light to enter and selectively emits monochromatic light such as R, G, and B. The separation of white light into monochromatic light selectively includes color separation and spectroscopy. Call.

  Further, an example in which processing such as polishing and forming of the surface is facilitated by making the incident surface and the exit surface of the cylindrical color filter 11 flat will be described with reference to FIGS. 18, 19, 20, and 21.

  In the cylindrical color filter 11 according to the present embodiment, as shown in FIG. 19, in the outer shape of the cross section perpendicular to the rotation axis 14 of the cylindrical color filter 11, the part forming the entrance surface and the exit surface is a straight line. Further, in the inner shape of the cross section, the part forming the entrance surface and the exit surface is a straight line.

  On the other hand, as shown in FIG. 20, in the case of the columnar color filter 15, when the light beam from the light source is incident at an angle with the incident surface, the thickness of the columnar color filter 15 causes a gap between the incident light beam and the emitted light beam. An optical path shift (step) occurs. When the light modulation element is illuminated, the light path shift is not particularly a problem because the light is irradiated in a range sufficiently wider than the width of the arranged pixels. However, when the shift amount is large, it is necessary to irradiate a wide range as it is, and the efficiency of the illumination light amount is reduced. For this reason, it is desirable that the shift amount is small.

  That is, in the present embodiment, as shown in FIG. 21, the thickness of the transmission part forming the cylindrical color filter 11 is reduced, and the shift of the optical path when incident at an angle is reduced.

  The width of the light beam incident on the cylindrical color filter 11 is determined by the length of the focal length of the condenser optical system 4, that is, the distance from the convergence position 16. As shown in FIG. 22, when the convergence position 16a is close, the light flux on the incident surface 17 becomes narrower. However, it is difficult on the layout to bring the light modulation element 7 close to the convergence position 16a. As shown in FIG. 23, when the convergence position 16b is increased, the distance from the exit surface 18 to the light modulation element 7 is sufficient, but the light flux at the entrance surface 17 is widened and the entire color filter is enlarged.

  Therefore, as shown in FIG. 24, the cylindrical color filter forms a concave cylinder, the convergence degree of the condenser optical system 4 is lowered, the distance from the color filter to the modulation element can be increased, and the degree of freedom in layout can be increased. .

  Since the cross-sectional outer shape of the cylindrical color filter 11 is a straight line and the inner shape of the cross-section is an arc, plano-concave cylinder lenses are formed on the incident side and the emission side, and the light beam diverges due to negative refractive power. Thereby, even when the focal length of the condenser optical system 4 is short, the convergence position 16c after passing through the color filter is sufficiently far from the exit surface 18, and the arrangement of the light modulation element 7 and the like becomes easy.

  In addition, in the cross-sectional shape perpendicular to the rotation axis of the cylindrical color filter 11, the portion that forms the entrance surface and the exit surface is an arc, so that wind noise can be reduced in addition to weight reduction.

Also, as shown in FIG. 25, a plano-convex cylinder lens is formed on the incident side and the emission side by setting the outer shape of the cross section of the cylindrical color filter 11 to an arc and the inner shape of the cross section to a straight line, and has a positive refractive power. Can converge the luminous flux. As a result, the number of convex cylinder lenses (4a, 4b) constituting the condenser optical system 4 shown in FIG. 13 and the like can be reduced. According to this configuration, since the power of the convex cylinder lens formed by the cylindrical color filter 11 is reduced, the aberration generated in the cylindrical color filter 11 can be reduced.

  Further, since the cylindrical color filter 11 does not have power by making the cross-sectional outer shape and the cross-sectional inner shape of the cylindrical color filter 11 both arcs, the condenser optical system 4 alone converges the illumination light to the light modulation element 7. This is suitable for controlling the state.

It is a top view of the projector apparatus which concerns on this embodiment. It is a perspective view of the projector apparatus which concerns on this embodiment. It is a perspective view of the color filter concerning this embodiment. It is a top view of the color filter which concerns on this embodiment. It is a side view of the color filter which concerns on this embodiment. It is a perspective view of the color filter concerning this embodiment. It is sectional drawing of the color filter which concerns on this embodiment. It is a perspective view of the color filter concerning this embodiment. It is sectional drawing of the color filter which concerns on this embodiment. It is sectional drawing of the color filter which concerns on this embodiment. It is sectional drawing of the color filter which concerns on this embodiment. It is a perspective view of the color filter concerning this embodiment. It is a top view of the projector apparatus which concerns on this embodiment. It is a perspective view of the projector apparatus which concerns on this embodiment. It is a perspective view of the color filter which concerns on this embodiment. It is sectional drawing of the color filter which concerns on this embodiment. It is a side view of the color filter which concerns on this embodiment. It is a perspective view of the color filter concerning this embodiment. It is sectional drawing of the color filter which concerns on this embodiment. It is sectional drawing of the color filter which concerns on this embodiment. It is sectional drawing of the color filter which concerns on this embodiment. It is a top view of the projector apparatus which concerns on this embodiment. It is a top view of the projector apparatus which concerns on this embodiment. It is a top view of the projector apparatus which concerns on this embodiment. It is sectional drawing of the color filter which concerns on this embodiment. It is sectional drawing of the color filter which concerns on this embodiment. It is sectional drawing of the conventional projector apparatus. It is a top view of the conventional projector apparatus. It is a perspective view of the conventional projector apparatus. It is a perspective view of the conventional circular filter. It is a front view of the conventional circular filter.

Explanation of symbols

1 Light source (lamp)
DESCRIPTION OF SYMBOLS 2 Reflector 3 Rectangular aperture 4 Condenser lens system 4a, 4b Plano-convex cylinder lens 5 Circular filter 5a, 5b, 5c Transmission part of each color 6 Color filter drive device 7 Color modulation element 8 Projection lens 9 Polarization scanning device (galvano mirror)
10 Use range of color filter 11 Color filter 12 Drive device

Claims (15)

A light source that emits white light; a light collecting unit that collects the light emitted from the light source to form a substantially single light beam; a light modulation element that modulates the light beam; and the light beam modulated by the light modulation element. In a projector apparatus having a projection lens that projects onto a screen,
A projector apparatus, wherein the light beam formed by the light converging means is incident on a rotating columnar color separation filter and spectrally divided in a time division manner.   The projector apparatus according to claim 1, wherein the columnar color separation filter has a plane of incidence and emission of the light beam.   The projector apparatus according to claim 1, wherein the columnar color separation filter has an incident surface and an exit surface of the light beam that are arcs. A first columnar prism having a concave surface having the same curvature as the incident surface of the columnar color separation filter on which the light beam is incident, and the incident surface of the light beam being a plane;
A first columnar prism having a concave surface having the same curvature as the exit surface of the columnar color separation filter from which the light beam is emitted, and a light exit surface of the light beam being a plane.
4. The projector apparatus according to claim 3, wherein the first columnar prism and the second columnar prism are respectively disposed in proximity to an incident surface and an output surface of the columnar color separation filter.   5. The projector device according to claim 1, wherein a surface of the columnar color separation filter includes an absorption filter that absorbs light having a wavelength other than a specific wavelength.   5. The projector according to claim 1, wherein a surface of the columnar color separation filter is formed of a reflective filter that reflects light having a specific wavelength and transmits light having a wavelength other than the specific wavelength. apparatus.   The projector apparatus according to claim 1, wherein the columnar color separation filter splits light into three primary colors of red, blue, and green. A light source that emits white light; a light collecting unit that collects the light emitted from the light source to form a substantially single light beam; a light modulation element that modulates the light beam; and the light beam modulated by the light modulation element. In a projector apparatus having a projection lens that projects onto a screen,
A projector apparatus, wherein the light beam formed by the light converging means is incident on a rotating cylindrical color separation filter and spectrally divided in a time division manner.   9. The projector apparatus according to claim 8, wherein the cylindrical color separation filter has a plane of incidence and emission of the light beam.   9. The projector apparatus according to claim 8, wherein the cylindrical color separation filter has an incident surface and an output surface of the light beam that are arcs.   The cylindrical color separation filter is characterized in that an emission surface for emitting the luminous flux into the cylinder and an incident surface for reentering the cylindrical color separation filter for the speed of light emitted in the cylinder are flat. The projector device according to claim 8.   The cylindrical color separation filter is characterized in that an exit surface for emitting the luminous flux into the cylinder and an entrance surface for reentering the cylindrical color separation filter for the speed of light emitted into the cylinder are arcs. The projector device according to claim 8.   13. The projector device according to claim 8, wherein the surface of the cylindrical color separation filter is an absorption filter that absorbs light having a wavelength other than a specific wavelength.   The surface of the said cylindrical color separation filter consists of a reflection type filter which reflects the light of a specific wavelength, and permeate | transmits light other than a specific wavelength, The any one of Claim 8-12 characterized by the above-mentioned. Projector device.   The projector device according to claim 8, wherein the cylindrical color separation filter splits into three primary colors of red, blue, and green.

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