JP2006337924A - Optical element, manufacturing method thereof and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical element capable of fixing a planar mirror more simply and more precisely. <P>SOLUTION: A seating prism is fitted into a groove disposed on a base 31 and is fixed by the base 31, a first mirror 33 is pressed against a side surface of the seating prism, a screw 82 and a screw 83 are screw-inserted to screw holes of a support part 71 and, thus, the first mirror 33 is fixed by the seating prism. A second mirror 34 is pressed against a side surface of the seating prism, a screw 85 and a screw 86 are screw-inserted to screw holes of a support part 72 and, thus, the second mirror 34 is fixed by the seating prism. The optical element can be applied for an image display device or the like which displays an image by projecting light. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical element, a manufacturing method, and an image display device, and more particularly, to an optical element, a manufacturing method, and an image display device that can fix a plate-like optical member more easily and more accurately.

  2. Description of the Related Art Conventionally, an image display apparatus that displays an image using light of three primary colors of red, green, and blue is known. For example, in a rear projection type image display device using a liquid crystal display device, red light, green light, and blue light emitted from the liquid crystal display device are combined in a dichroic prism, and the combined light is combined. An image is displayed by projection (see, for example, Patent Document 1).

  In the image display device using the one-dimensional light modulation element, each of red light, green light, and blue light emitted from the light source is modulated by the one-dimensional light modulation element. The modulated red light, green light, and blue light are combined in a dichroic prism, the combined light is scanned, and the scanned light is projected to display an image.

  However, the dichroic prism is expensive and expensive. Further, there are few materials suitable as a material to be deposited on the reflection surface (or transmission surface) of the dichroic prism, and when a laser is used as the light source, light scattering on the reflection surface of the dichroic prism cannot be ignored. Therefore, a method of combining light by combining two plate-like mirrors in place of the dichroic prism has been proposed.

  In the method of synthesizing light using this plate-like mirror, the two plate-like mirrors are provided on a substrate such as a metal provided along the bottom and side surfaces of the plate-like mirror, respectively. It is inserted (inserted) into the groove of and fixed with an adhesive or the like.

  Then, in the first mirror, the incident green light and blue light are combined, and the combined light (green light and blue light) is incident on the second mirror. Further, in the second mirror, the incident green light, blue light and red light are combined, and the combined light is projected to display an image.

JP 2002-90505 A

  However, in the method of synthesizing light using the plate-shaped mirror described above, the groove on the substrate for fixing the plate-shaped mirror is provided along the bottom and side surfaces of the plate-shaped mirror. Therefore, the groove for fixing the plate-shaped mirror could not be processed with high accuracy, and as a result, the plate-shaped mirror could not be fixed to the substrate with high accuracy.

  Therefore, the position (incident position) and angle (incident angle) of each light incident on the plate-like mirror are shifted, and the displayed image becomes an image in which the respective colors appear to be shifted. In addition, since the plate-shaped mirror cannot be fixed with high accuracy, the position of each optical component constituting the optical system in the previous stage of the plate-shaped mirror is further adjusted in order to correct the color shift of the image caused by this. This adjustment was very cumbersome.

  The present invention has been made in view of such a situation, and makes it possible to fix a plate-like mirror more easily and more accurately.

  The optical element of the present invention includes a plate-like first mirror that transmits or reflects incident light as it is, a plate-like second mirror that transmits or reflects incident light as it is, A first surface for fixing one mirror, and a fixing base having a second surface for fixing a second mirror provided to form a predetermined angle with the first surface; In the first mirror, the third surface of the first mirror is abutted against the first surface of the fixed base and fixed to the fixed base, and the second mirror has the fourth surface of the second mirror. It is abutted against the second surface of the fixed base and fixed to the fixed base.

  The first mirror transmits the first color light of the three primary colors incident from the surface of the first mirror facing the third surface as it is, enters the second mirror, and enters the second mirror. Of the three primary colors of light incident from the surface 3, the second color light is reflected and incident on the second mirror, and the second mirror has the first color incident from the fourth surface. The light and the second color light are transmitted as they are, the third color light of the three primary colors incident from the surface of the second mirror facing the fourth surface is reflected, and the first color , Second color light, and third color light can be combined.

  The first mirror is formed in a wedge shape so that the third surface and the surface of the first mirror facing the third surface form a predetermined angle, and the second mirror is formed on the fourth surface. And a surface of the second mirror facing the fourth surface can be formed in a wedge shape so as to form a predetermined angle.

  The first mirror and the second mirror may be configured by dichroic mirrors, and the fixed base may be formed by synthetic quartz.

  In the manufacturing method of the present invention, a plate-like first mirror that transmits or reflects incident light as it is is abutted against and fixed to the first surface for fixing the first mirror of the fixed base. In order to fix the second mirror, the plate-like second mirror that transmits or reflects the incident light as it is is provided so as to form a predetermined angle with the first surface of the fixing base. It is abutted against and fixed to the second surface.

  In the optical element and the manufacturing method of the present invention, the plate-like first mirror that transmits or reflects the incident light as it is hits the first surface for fixing the first mirror of the fixing base. A second mirror in which a plate-like second mirror that is applied and fixed and transmits or reflects incident light as it is is provided so as to form a predetermined angle with the first surface of the fixing base. It is abutted against the second surface for fixing and fixed.

  The image display device of the present invention includes a first modulation unit that modulates light of a first color among the three primary colors of light, and a second modulator that modulates light of the second color among the three primary colors of light. The first color and the first color light incident from the modulation means, the first surface and the fixing base having the second surface provided to form a predetermined angle with the first surface, and the first color light as it is. Transmitting or reflecting the plate-like first mirror that is fixed by being abutted against the first surface of the fixing base, and transmits the first color light incident from the first mirror as it is, The first color light and the second color light are synthesized by reflecting the second color light incident from the second modulation means on the surface opposite to the surface on which the first color light is incident. And projecting light that is a combination of the plate-like second mirror fixed against the second surface of the fixed base, the light of the first color, and the light of the second color. Te, characterized in that it comprises a projection means for displaying an image.

  In the image display device of the present invention, the first color of the three primary colors of light is modulated, the second color of the three primary colors of light is modulated, and the first surface of the fixed base The plate-like first mirror abutted on and fixed to the first mirror allows the first color light to pass through or be reflected as it is and to form a predetermined angle with the first surface of the fixed base. In the plate-like second mirror that is fixed by being abutted against the second surface, the first color light incident from the first mirror is transmitted as it is, and the surface on which the first color light is incident The light of the second color incident on the opposite surface is reflected to combine the light of the first color and the light of the second color, and the light of the first color and the light of the second color are combined. The combined light is projected and an image is displayed.

  According to the present invention, a plate-like optical member can be fixed. In particular, according to the present invention, a plate-like optical member can be fixed more easily and more accurately.

  Embodiments of the present invention will be described below. The correspondence relationship between the invention described in this specification and the embodiments of the invention is exemplified as follows. This description is intended to confirm that the embodiments supporting the invention described in this specification are described in this specification. Therefore, although there is an embodiment which is described in the embodiment of the invention but is not described here as corresponding to the invention, it means that the embodiment is not It does not mean that it does not correspond to the invention. Conversely, even if an embodiment is described herein as corresponding to an invention, that means that the embodiment does not correspond to an invention other than the invention. Absent.

  Further, this description does not mean all the inventions described in this specification. In other words, this description is for the invention described in the present specification, which is not claimed in this application, that is, for the invention that will be applied for in the future or that will appear and be added by amendment. It does not deny existence.

  The optical element according to claim 1 transmits the incident light as it is, or transmits a plate-like first mirror that reflects the light (for example, the first mirror 33 in FIG. 2) and the incident light as it is. Or a plate-like second mirror to be reflected (for example, the second mirror 34 in FIG. 2), a first surface for fixing the first mirror (for example, the side surface 43 in FIG. 2), and the first A fixing base (for example, the pedestal prism 32 in FIG. 2) having a second surface (for example, the side surface 44 in FIG. 2) for fixing the second mirror provided at a predetermined angle with the surface of The first mirror is fixed to the fixed base by a third surface (for example, the surface 45 of FIG. 2) of the first mirror being abutted against the first surface of the fixed base. The fourth surface of the second mirror (for example, the surface 46 in FIG. 2) protrudes from the second surface of the fixed base. Against being characterized in that it is fixed to the fixed base by.

  In the optical element according to claim 2, the first mirror (for example, the first mirror 33 in FIG. 2) is a surface of the first mirror (for example, the surface 45 in FIG. 2) facing the third surface (for example, the surface 45 in FIG. 2). For example, the first color light of the three primary colors incident from the surface 81) in FIG. 3 is transmitted as it is to be incident on the second mirror (for example, the second mirror 34 in FIG. 2), and the third The light of the second color among the three primary colors of light incident from the surface is reflected and incident on the second mirror, and the second mirror starts from the fourth surface (for example, the surface 46 in FIG. 2). The incident first color light and the second color light are transmitted as they are, and the three primary colors of the light incident from the surface of the second mirror (for example, the surface 84 in FIG. 3) facing the fourth surface. The third color light is reflected, and the first color light, the second color light, and the third color light are combined.

  In the optical element according to claim 3, the first mirror (for example, the first mirror 33 in FIG. 2) is opposite to the third surface (for example, the surface 45 in FIG. 2) and the third surface. The surface of one mirror (for example, the surface 81 in FIG. 3) is formed in a wedge shape so as to form a predetermined angle, and the second mirror (for example, the second mirror 34 in FIG. 2) is formed on the fourth surface. (For example, the surface 46 in FIG. 2) and the second mirror surface (for example, the surface 84 in FIG. 3) facing the fourth surface are formed in a wedge shape so as to form a predetermined angle. Features.

  In the optical element according to the fourth aspect, the first mirror (for example, the first mirror 33 in FIG. 2) and the second mirror (for example, the second mirror 34 in FIG. 2) are configured by dichroic mirrors and fixed. The base (for example, the base prism 32 in FIG. 2) is formed of synthetic quartz.

  In the manufacturing method according to claim 5, a plate-like first mirror that transmits or reflects incident light as it is (for example, the first mirror 33 in FIG. 2) is a fixed base (for example, in FIG. 2). The first light (for example, the side surface 43 in FIG. 2) for fixing the first mirror of the pedestal prism 32) is abutted and fixed (for example, processing in step S13 in FIG. 12), and incident light is A plate-like second mirror that transmits or reflects as it is (for example, the second mirror 34 in FIG. 2) is provided so as to form a predetermined angle with the first surface of the fixed base. It is abutted against and fixed to a second surface (for example, the side surface 44 in FIG. 2) for fixing the mirror (for example, the process of step S14 in FIG. 12).

  The image display device according to claim 6 is a first modulation unit (for example, the one-dimensional light modulation element 12-2 in FIG. 1 or the one-dimensional light) that modulates light of the first color among the three primary colors of light. A light modulation element 12-3), a second modulation means (for example, the one-dimensional light modulation element 12-1 in FIG. 1) for modulating the light of the second color among the three primary colors of light, A fixed base (for example, the pedestal in FIG. 2) having a surface (for example, the side surface 43 in FIG. 2) and a second surface (for example, the side surface 44 in FIG. 2) provided to form a predetermined angle with the first surface. A first plate-shaped first plate fixed to the first surface of the fixing base, which transmits or reflects the first color light incident from the prism 32) and the first modulation means as it is; The first color light incident from the mirror (for example, the first mirror 33 in FIG. 2) and the first mirror is transmitted as it is, The second color light incident from the second modulation means is reflected on the surface (for example, the surface 84 in FIG. 3) opposite to the surface on which the light of the first color is incident, and the first color light and second A plate-like second mirror (for example, the second mirror 34 in FIG. 2) that is abutted against and fixed to the second surface of the fixing base, and the first color light. And projection means (for example, the enlarged projection system 16 in FIG. 1) for projecting light synthesized with the light of the second color to display an image.

  The present invention can be applied to an image display device, a 3CCD (Charge Coupled Devices) camera, and the like.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing a configuration example of an image display device to which the present invention is applied.

  The image display apparatus includes a light source 11-1 to a light source 11-3, a one-dimensional light modulation element 12-1 to a one-dimensional light modulation element 12-3, a color synthesis unit 13, a light deflection unit 14, a secondary optical system 15, and The image display apparatus is configured to include the magnifying projection system 16, and projects a light for displaying an image onto the screen 17 to display a two-dimensional image on the screen 17.

  Each of the light sources 11-1 to 11-3 emits red (R), green (G), and blue (B) linear light (laser), and the emitted linear light is 1 each. The light is incident on the one-dimensional light modulation element 12-1 to the one-dimensional light modulation element 12-3. Hereinafter, when it is not necessary to distinguish each of the light sources 11-1 to 11-3, they are simply referred to as the light sources 11.

  Each of the one-dimensional light modulation element 12-1 to the one-dimensional light modulation element 12-3 includes, for example, a GLV (Grating Light Valve) for modulating red, green, and blue linear light. The linear light incident from each of the light sources 11-1 to 11-3 is modulated, and the modulated light is incident on the color synthesis unit 13.

  For example, each of the GLVs constituting each of the one-dimensional light modulation element 12-1 to the one-dimensional light modulation element 12-3 has a movable ribbon electrode (hereinafter referred to as a movable ribbon electrode) having a reflective film formed on the surface thereof. And a fixed ribbon electrode (hereinafter referred to as a fixed ribbon electrode) having a reflective film formed on its surface, a common electrode made of a polysilicon thin film on a silicon substrate, and the like.

  The movable ribbon electrode and the fixed ribbon electrode are alternately arranged on the common electrode so as to be along the longitudinal direction of the linear light incident from the light source 11, and the movable ribbon electrode is not applied with a driving voltage. And each reflective surface (surface in which the reflective film is formed) of a fixed ribbon electrode is made so that the height from a common electrode may become equal.

  Further, when a driving voltage is applied to the movable ribbon electrode, an electrostatic force is generated between the movable ribbon electrode and the common electrode, and the movable ribbon electrode moves or deforms according to the electrostatic force, and the reflecting surface of the movable ribbon electrode The height from the common electrode to the reflecting surface of the fixed ribbon electrode is different (no longer coincident). For this reason, of the light incident from the light source 11, there is an optical path difference between the light reflected on the reflecting surface of the fixed ribbon electrode and the light reflected on the reflecting surface of the movable ribbon electrode, whereby the GLV functions as a reflective diffraction grating. Then, diffracted light including a predetermined order is generated. The diffracted light generated in the GLV in this way is spatially modulated and enters the color synthesis unit 13.

  Hereinafter, when it is not necessary to distinguish each of the one-dimensional light modulation elements 12-1 to 12-3 from each other, they are simply referred to as the one-dimensional light modulation elements 12. Although an example using GLV as the one-dimensional light modulation element 12 has been described here, not only GLV but also a DMD (Digital Micromirror Device) (trademark), a reflective or transmissive liquid crystal element, or the like is used. Also good.

  The color combining unit 13 includes, for example, two plate-like mirrors, and the like, and the red light and the green light incident from each of the one-dimensional light modulation elements 12-1 to 12-3. And the blue light are combined, and the combined light is incident on the light deflecting unit 14. The light deflecting unit 14 is configured by, for example, a galvano mirror, and the light deflecting unit 14 scans the light incident from the color synthesizing unit 13 by rotating the reflecting surface of the galvano mirror, and the scanned light. Is incident on the secondary optical system 15.

  The secondary optical system 15 condenses the scanned light incident from the light deflection unit 14 to form a two-dimensional image. The magnifying projection system 16 enlarges the two-dimensional image obtained through the secondary optical system 15 as an intermediate image, projects it onto the screen 17, and displays a two-dimensional image on the screen 17.

  FIG. 2 is a perspective view showing a more detailed configuration example of the color composition unit 13 of FIG.

  In FIG. 2, the color composition unit 13 is configured to include a base 31, a pedestal prism 32, a first mirror 33, and a second mirror 34, and the pedestal prism 32, the first mirror 33, and the second mirror 34 are the bases. 31 is arranged.

  The base 31 is made of, for example, a metal such as copper or aluminum. In the drawing, the upper surface has a groove for fixing the pedestal prism 32 that is slightly larger than the bottom surface of the triangular prism-shaped pedestal prism 32. Is provided. The groove is machined with high accuracy, and the pedestal prism 32 is fitted into the groove, and is pressed and fixed to the front side surface 41 in the drawing of the base 31.

  The pedestal prism 32 is made of, for example, a glass material such as synthetic quartz having a low thermal expansion coefficient, and in particular, the angle formed by each of the side surfaces 42 to 44 of the pedestal prism 32 is a predetermined angle. So that it is processed with high accuracy.

  The first mirror 33 is made of, for example, a dichroic mirror, and is formed by processing a glass material such as synthetic quartz having a low thermal expansion coefficient into a plate shape with high accuracy. The first mirror 33 is fixed to the pedestal prism 32 with the front surface 45 abutting against the side surface 43 of the pedestal prism 32 in the drawing. Similar to the first mirror 33, the second mirror 34 is made of, for example, a dichroic mirror and is formed by processing a glass material such as synthetic quartz having a low thermal expansion coefficient into a plate shape with high accuracy. The second mirror 34 is fixed to the pedestal prism 32 with the left surface 46 in the drawing abutting against the side surface 44 of the pedestal prism 32.

  Further, as shown in FIG. 3, a support portion 71 and a support portion 72 for supporting the first mirror 33 and the second mirror 34 are fixed on the base 31. FIG. 3 is a perspective view showing the appearance of the color composition unit 13 when the color composition unit 13 of FIG. 2 is viewed from diagonally right and backward in FIG.

  The support portion 71 is formed of, for example, a metal such as copper or aluminum, and the support portion 71 is disposed on the near side in the drawing of the surface 81 of the first mirror 33 that faces the surface 45 of the first mirror 33. ing. Also, in the drawing of the support portion 71, two screw holes are provided on the front side surface, and a screw 82 and a screw 83 such as a so-called potato screw are respectively screwed into the screw holes, thereby supporting the screw portion. A rectangular plate 73 inserted between the portion 71 and the surface 81 of the first mirror 33 is pressed against the surface 81 of the first mirror 33, so that the first mirror 33 is made of the base prism 32. To be fixed to the pedestal prism 32.

  The support portion 72 is made of, for example, a metal such as copper or aluminum, and the support portion 72 is on the near side in the drawing of the surface 84 of the second mirror 34 that faces the surface 46 of the second mirror 34. Has been placed. In addition, in the drawing of the support portion 72, two screw holes are provided on the front side surface, and a screw 85 and a screw 86 such as a so-called potato screw are screwed into the screw holes, respectively. A rectangular plate 74 inserted between the portion 72 and the surface 84 of the second mirror 34 is pressed against the surface 84 of the second mirror 34, whereby the second mirror 34 is made to be the base prism 32. To be fixed to the pedestal prism 32.

  That is, as shown in FIG. 4, the first mirror 33 has the surface 45 of the first mirror 33 abutted against the side surface 43 of the pedestal prism 32 and pressed by the plate 73 in the direction indicated by the arrow A <b> 11. Fixed to.

  Similarly to the case of the first mirror 33, the surface 46 of the second mirror 34 is abutted against the side surface 44 of the pedestal prism 32 and pressed by the plate 74 in the direction indicated by the arrow A12. Fixed to the prism 32.

  More specifically, as shown in FIG. 5, the support portion 71 is fixed to the base 31 with screws 101 and 102, and the support portion 72 is fixed to the base 31 with screws 103 and screws 104. That is, the screw 101 and the screw 102 are passed (inserted) through a screw hole provided in the base 31 from the surface opposite to the surface on which the pedestal prism 32 of the base 31 is disposed, and the support portion 71. And a support portion 71 is fixed to the base 31.

  Similarly, the screw 103 and the screw 104 are passed (inserted) through a screw hole provided in the base 31 from the surface of the base 31 opposite to the surface on which the pedestal prism 32 is disposed, and the support portion The support portion 72 is fixed to the base 31 by being screwed into a screw receiver (not shown) 72.

  And when the support part 71 and the support part 72 are fixed to the base 31, the 1st mirror 33 and the 2nd mirror 34 are respectively between the support part 71 and the side surface 43 of the base prism 32, and the support part 72 and the base. It is disposed between the side surface 44 of the prism 32 and fixed to the pedestal prism 32.

  For example, when the second mirror 34 is fixed, the second mirror 34 is disposed between the support portion 72 and the side surface 44 of the pedestal prism 32 as shown in FIG. A plate 74 is disposed between the surface 84 of the second mirror 34 and the support portion 72. Furthermore, screws 85 and 86 are screwed into the screw holes of the support portion 72, and the second mirror 34 is pressed against the side surface 44 of the pedestal prism 32 by the plate 74 and fixed to the pedestal prism 32.

  When the screws 85 and 86 are screwed into the screw holes of the support portion 72, as shown in FIG. 7, the screws 85 and 86 press the plate 74 in the direction indicated by the arrow A21 (upward in the figure). It will be. Then, the plate 74 is pressed by the screw 85 and the screw 86 in the direction indicated by the arrow A21, so that the plate 74 presses the second mirror 34 against the side surface 44 of the base prism 32.

  The pedestal prism 32 is fitted in a groove provided in the base 31, and the pedestal prism 32 is engaged with a surface on the side surface 41 (FIG. 2) side of the groove provided in the base 31. Therefore, when the screws 85 and 86 are screwed into the screw holes of the support portion 72, the second mirror 34 is pressed against the side surface 44 of the pedestal prism 32 by the plate 74 and fixed to the pedestal prism 32.

  In this way, the first mirror 33 and the second mirror 34 processed with high accuracy are abutted against and fixed to the side surfaces 43 and 44 of the base prism 32 processed with high accuracy. The second mirror 34 can be fixed to the base 31 (pedestal prism 32) more easily and with higher accuracy.

  By the way, as described above, the color synthesizing unit 13 synthesizes the light incident from the one-dimensional light modulation element 12 and causes the synthesized light to enter the light deflecting unit 14. For example, as shown in FIG. 8, the color synthesizing unit 13 receives light from the one-dimensional light modulation element 12-2 and the one-dimensional light modulation element 12-3 on the first mirror 33, and further, the first mirror 33. The light emitted from the light and the light from the one-dimensional light modulation element 12-1 are arranged so as to enter the second mirror 34.

  A film that reflects light of a predetermined color (wavelength) is formed on the surface 45 of the first mirror 33. For example, the first mirror 33 receives green light incident on the surface 45 of the first mirror 33. The blue light incident on the surface 45 of the first mirror 33 is reflected as it is.

  Therefore, the first mirror 33 transmits the green light incident on the surface 81 of the first mirror 33 from the one-dimensional light modulation element 12-2 as it is, and is emitted from the surface 45 of the first mirror 33 to be emitted from the second mirror 33. The blue light incident on the surface 45 of the first mirror 33 from the one-dimensional light modulation element 12-3 is reflected on the surface 45 and is incident on the second mirror 34.

  Further, a film that reflects light of a predetermined color (wavelength) is formed on the surface 84 of the second mirror 34. For example, the second mirror 34 has a green color incident on the surface 84 of the second mirror 34. The light and the blue light are transmitted as they are, and the red light incident on the surface 84 of the second mirror 34 is reflected.

  Therefore, the second mirror 34 transmits the green light and the blue light incident on the surface 46 of the second mirror 34 from the first mirror 33 as they are, and then emits the light from the surface 84 of the second mirror 34 to form a light deflecting unit. The red light incident on the surface 84 of the second mirror 34 from the one-dimensional light modulation element 12-1 is reflected on the surface 84 and is incident on the light deflecting unit 14.

  More specifically, as shown in FIG. 9, in the first mirror 33, the blue light from the one-dimensional light modulation element 12-3 is incident on the surface 45 of the first mirror 33 at an angle of 45 degrees. The surface 45 and the surface 81 of the first mirror 33 form a predetermined angle in order to correct astigmatism that causes deterioration of the image quality of the displayed image. (The first mirror 33 has a wedge shape). Further, the surface 121 and the surface 122 adjacent to the surface 45 and the surface 81 are respectively perpendicular to the surface 45.

  The second mirror 34 is arranged so that the red light from the one-dimensional light modulation element 12-1 is incident on the surface 84 of the second mirror 34 at an angle of 45 degrees. In order to correct astigmatism that causes image quality degradation, the surface 46 and the surface 84 of the second mirror 34 form a predetermined angle (the second mirror 34 has a wedge shape). ). Further, the surface 123 and the surface 124 adjacent to the surface 46 and the surface 84 are respectively perpendicular to the surface 84.

  Further, the outer shape of the first mirror 33 is, for example, as shown in FIG. 10A, the length of the first mirror 33 in the lateral direction (the length from the surface 121 to the surface 122) is 24 mm. The length of the mirror 33 in the vertical direction (the length from one surface of the two surfaces different from the surface 121 and the surface 122 adjacent to the surface 81 and the surface 45 to the other surface) is 45 mm.

  Further, the position where the green light from the one-dimensional light modulation element 12-2 is incident on the surface 81 is a position of 10.5 mm on the right side from the surface 122 in the drawing, and the length from the position to the surface 121 is 13.5. mm. Further, the length (thickness) from the surface 81 to the surface 45 at the position where the green light from the one-dimensional light modulation element 12-2 is incident on the surface 81 is 3 mm. The angle made by is 22.7 minutes.

  On the other hand, the external shape of the second mirror 34 is, for example, as shown in FIG. 10B, the length of the second mirror 34 in the lateral direction (the length from the surface 123 to the surface 124) is 28 mm. The vertical length of the second mirror 34 (the length from one of the two surfaces different from the surface 123 and the surface 124 adjacent to the surface 46 and the surface 84 to the other surface) is 45 mm. is there.

  The length (thickness) from the surface 46 to the surface 84 at the position where the green light and the blue light from the first mirror 33 are incident on the surface 46 is 3 mm. The angle made is 15.5 minutes.

  The first mirror 33 and the second mirror 34 having such an outer shape are formed by processing so as to satisfy the tolerance shown in FIG. 11 and are fixed to the pedestal prism 32, for example.

  In FIG. 11, the tolerances of the wedge angle, the plate mounting angle, and the sub-direction angle for each of the first mirror 33 and the second mirror 34 are shown. Here, the wedge angle refers to an angle formed by two opposing surfaces that reflect or transmit light from the one-dimensional light modulation element 12, and the flat plate mounting angle refers to the first mirror 33 or the second mirror 34. The sub-direction angle refers to the angle of the first mirror 33 or the second mirror 34 with respect to the side surface 43 or the side surface 44 of the base prism 32.

  Therefore, in the first mirror 33, the angle formed by the surface 45 and the surface 81 is 22.7 minutes + 0.5 minutes / −2 minutes, that is, the angle formed by the surface 45 and the surface 81 is 20.7 minutes to 23.2 minutes. It is processed and formed to have an angle in the range.

  The first mirror 33 has an angle formed by the surface 45 of the first mirror 33 and the side surface 42 of the pedestal prism 32 in the range of 45 ° ± 3.5 minutes, and the surface 45 of the first mirror 33 and the pedestal. The angle formed between the side surface 43 of the prism 32 and the direction perpendicular to the surface 45 is pressed and fixed to the side surface 43 of the pedestal prism 32 so that the angle is in the range of 0 ° ± 3.5 minutes.

  In contrast, in the second mirror 34, the angle formed by the surface 46 and the surface 84 is 15.5 minutes + 0.5 minutes / −1.5 minutes, that is, the angle formed by the surface 46 and the surface 84 is 14 minutes to 16 minutes. It is processed and formed to have an angle in the range of minutes.

  The second mirror 34 has an angle formed by the surface 46 of the second mirror 34 and the side surface 42 of the pedestal prism 32 in the range of 45 ° ± 2.5 minutes, and the surface 46 of the second mirror 34 and the pedestal. The angle formed between the side surface 44 of the prism 32 and the side surface 44 in a direction perpendicular to the surface 46 is pressed and fixed to the side surface 44 of the pedestal prism 32 so that the angle is in the range of 0 ° ± 2.5 minutes.

  Next, an assembly process, which is a process in which the color composition unit 13 described above is assembled by an operator, will be described with reference to the flowchart of FIG.

  In step S <b> 11, the pedestal prism 32 is fixed to the base 31. For example, the pedestal prism 32 is fitted into a groove provided in the base 31 and pressed against the surface of the base 31 on the side surface 41 side. The pedestal prism 32 is fixed to the base 31 with, for example, an adhesive.

  In step S <b> 12, the support part 71 and the support part 72 are fixed to the base 31. For example, as shown in FIG. 5, the support portion 71 is fixed to the base 31 with screws 101 and 102, and the support portion 72 is fixed to the base 31 with screws 103 and screws 104.

  When the support part 71 and the support part 72 are fixed to the base 31, the first mirror 33 is inserted between the side surface 43 of the pedestal prism 32 and the support part 71, and the support part 71 and the first mirror 33 are further connected. A plate 73 is inserted between them. In step S13, the screws 82 and 83 are screwed into the screw holes of the support portion 71, the first mirror 33 is pressed against the side surface 43 of the pedestal prism 32 by the plate 73, and the first mirror 33 is moved to the pedestal prism. It is fixed to the pedestal prism 32 so as to abut against the pedestal 32.

  When the first mirror 33 is fixed to the pedestal prism 32, the second mirror 34 is inserted between the side surface 44 of the pedestal prism 32 and the support portion 72, and further, between the support portion 72 and the second mirror 34. The board 74 is inserted, and the process proceeds from step S13 to step S14.

  In step S <b> 14, the screws 85 and 86 are screwed into the screw holes of the support portion 72. Then, the second mirror 34 is pressed against the side surface 44 of the pedestal prism 32 by the plate 74, and the second mirror 34 is fixed to the pedestal prism 32 so as to abut against the pedestal prism 32, and the assembly process ends. .

  In this way, the first mirror 33 and the second mirror 34 are abutted against the side surface 43 and the side surface 44 of the pedestal prism 32 and are fixed to the pedestal prism 32. Thus, when the first mirror 33 and the second mirror 34 are abutted against the pedestal prism 32 and fixed, the accuracy of the position and angle at which the first mirror 33 and the second mirror 34 are fixed is the first. It is determined by the processing accuracy of each surface of the mirror 33, the second mirror 34, and the pedestal prism 32.

  Therefore, as compared with the conventional method of providing grooves on the base along the bottom and side surfaces of the first mirror and the second mirror and fixing the first mirror and the second mirror to the base, it is easier. In addition, the first mirror 33 and the second mirror 34 can be fixed to the base 31 (the pedestal prism 32) with higher accuracy.

  In particular, when combining red light, green light, and blue light using two plate-like mirrors (for example, the first mirror 33 and the second mirror 34), astigmatism is corrected. For this reason, plate-like mirrors are often wedge-shaped. Thus, when the two plate-like mirrors are wedge-shaped, the conventional method of fixing the plate-like mirror by providing a groove in the base also forms the groove provided in the base into the shape of a plate-like mirror. In addition, the wedge shape must be formed. However, as described above, the first mirror 33 and the second mirror 34 are abutted and fixed to the pedestal prism 32 to fix the first mirror 33 and the second mirror 34. Regardless of the shape, the first mirror 33 and the second mirror 34 can be fixed to the base 31 (the pedestal prism 32) at a desired position and at a desired angle more easily and accurately.

  In addition, when combining red light, green light, and blue light using two plate-like mirrors, the position and angle of the fixed plate-like mirror depends on the temperature inside the image display device, Changes due to changes in the environment of the plate-like mirror such as humidity. The positional and angular shifts of the plate-like mirrors (for example, the first mirror 33 and the second mirror 34) caused by such environmental changes are caused by the color shift of the displayed image and the displacement in the subsequent optical system. For this reason, the plate-like mirror is required to be stable in position and angle against environmental changes.

  For example, as shown in FIG. 13, the first mirror 33 passes through the position perpendicular to the surface 121 of the first mirror 33 and the light from the one-dimensional light modulation element 12-3 is incident on the surface 45 of the first mirror 33. When the straight mirror B11 is rotated about 1.5 minutes in the direction of the arrow A41, the second mirror 34 is perpendicular to the surface 123 of the second mirror 34, and the light from the one-dimensional light modulation element 12-1 is transmitted. When the straight line B12 passing through the position incident on the surface 81 of the second mirror 34 is used as an axis, the first mirror 33 is rotated in the direction of the arrow A41 for 1.5 minutes. Suppose that the second mirror 34 is further rotated by 1.5 minutes in the direction of the arrow A42.

  As described above, when the first mirror 33 or the second mirror 34 is rotated, the positional deviation generated at the position (two-dimensional image plane) of the two-dimensional image formed by the secondary optical system 15 in FIG. As shown in FIG. In FIG. 14, the first mirror 33 is provided for each of red light emitted from the light source 11-1, green light emitted from the light source 11-2, and blue light emitted from the light source 11-3. , The angle by which the second mirror 34 is rotated, the magnitude of the positional deviation on the two-dimensional image plane caused by the angle, and the magnitude of the positional deviation in units of pixels (dots) on the two-dimensional image plane 1 dot is 25.5 μm. In FIG. 2, the positional deviation sign is positive in the upward direction and negative in the downward direction.

  For example, when the first mirror 33 is rotated in the direction of arrow A41 in FIG. 13 by 1.5 minutes, the positional deviation of the green light emitted from the light source 11-2 on the two-dimensional image plane is 0.5 μm. Yes, 0 dot in pixel units. When the second mirror 34 is rotated in the direction of arrow A42 in FIG. 13 by 1.5 minutes, the positional deviation of the green light emitted from the light source 11-2 on the two-dimensional image plane is −0.5 μm. It is 0 dot in pixel unit. Furthermore, when the first mirror 33 is rotated by 1.5 minutes in the direction of arrow A41 in FIG. 13 and the second mirror 34 is rotated by 1.5 minutes in the direction of arrow A42, the light source 11- The positional deviation of the green light emitted from 2 in the two-dimensional image plane is 0 μm, and is 0 dot in pixel units.

  Since the red light emitted from the light source 11-1 does not enter the first mirror 33, it is not affected by the position shift or the angle shift of the first mirror 33. When the second mirror 34 is rotated in the direction of arrow A42 in FIG. 13 by 1.5 minutes, the positional deviation of the red light emitted from the light source 11-1 on the two-dimensional image plane is 44 μm, and the pixel The unit is 1.7 dots.

  Further, when the first mirror 33 is rotated by 1.5 minutes in the direction of arrow A41 in FIG. 13, the positional deviation of the blue light emitted from the light source 11-3 on the two-dimensional image plane is −32 μm. Yes, it is -1.3 dots in pixel units. When the second mirror 34 is rotated by 1.5 minutes in the direction of arrow A42 in FIG. 13, the positional deviation of the blue light emitted from the light source 11-3 on the two-dimensional image plane is 0.5 μm. Yes, 0 dot in pixel units. Furthermore, when the first mirror 33 is rotated by 1.5 minutes in the direction of arrow A41 in FIG. 13 and the second mirror 34 is rotated by 1.5 minutes in the direction of arrow A42, the light source 11- The positional deviation in the two-dimensional image plane of the blue light emitted from 3 is −32 μm, and is −1.3 dots in pixel units.

  Accordingly, if the first mirror 33 is rotated by 1.5 minutes in the direction of arrow A41 in FIG. 13 and the second mirror 34 is rotated by 1.5 minutes in the direction of arrow A42, As shown on the left side of FIG. 15, the light image 151 composed of red light, green light, and blue light formed on the two-dimensional image plane is shifted in position as shown on the right side of the drawing. The green light image 152 formed without being shifted, the red light image 153 formed with a positional shift of 1.7 dots on the upper side in the figure, and the lower position shifted by 1.3 dots in the figure. As a result, the image is divided into three images of the blue light image 154 that is formed, and the displayed image is a color-shifted image.

  As described above, when color composition is performed using the plate-like first mirror 33 and the second mirror 34, a slight inclination (angle deviation) of the first mirror 33 and the second mirror 34 causes a color deviation of the image. End up. Therefore, in order not to make the observer who sees the displayed image feel the color shift, the position shift on the two-dimensional image plane must be suppressed to 0.2 dots or less.

  For example, as shown in FIG. 16, the direction in which the first mirror 33 is rotated about a straight line B41 that passes through the center of the surface 45 of the first mirror 33 and is perpendicular to the surface 45 is the γ1 direction, and the center of the surface 45 is the center. The direction in which the first mirror 33 is rotated about the straight line perpendicular to the surface 121 and the straight line B41 is the α1 direction, the straight line B41 passing through the center of the surface 45 and perpendicular to the normal of the straight line B41 and the surface 121 is the axis The direction in which the first mirror 33 is rotated is the β1 direction.

  When the direction passing through the center of the surface 45 and perpendicular to the surface 121 and the straight line B41 is the X1 direction, and the direction that the angle between the X1 direction and the straight line B41 is 45 degrees is the Z1 direction, during the operation of the image display device, Alternatively, the positional deviation or angular deviation corresponding to 0.2 dots of the first mirror 33 before and after the change of the environment inside the image display device is as shown in FIG.

  FIG. 17 shows a positional deviation or an angular deviation of the first mirror 33 corresponding to a positional deviation of 0.2 dots on the two-dimensional image plane.

  For example, the angle shift in the β1 direction of the first mirror 33 corresponding to a position shift of 0.2 dots on the two-dimensional image plane is 0.12 minutes, the angle shift in the α1 direction is 0.12 minutes, and the angle in the γ1 direction. The deviation is 5 degrees. Further, the positional deviation in the X1 direction of the first mirror 33 corresponding to a positional deviation of 0.2 dots on the two-dimensional image plane is 1.25 mm, and the positional deviation in the Z1 direction is 3.5 μm.

  Further, for example, as shown in FIG. 18, the direction in which the second mirror 34 is rotated about a straight line B61 passing through the center of the surface 46 of the second mirror 34 and perpendicular to the surface 46 is the γ2 direction, A direction in which the second mirror 34 is rotated about a straight line that passes through the center and is perpendicular to the surface 123 and the straight line B61 is an α2 direction, passes through the center of the surface 46, and is a straight line B62 that is perpendicular to the normal line of the straight line B61 and the surface 123. The direction in which the second mirror 34 is rotated about the axis is the β2 direction.

  Then, assuming that the direction passing through the center of the surface 46 and perpendicular to the surface 123 and the straight line B61 is the X2 direction and the direction formed by the X2 direction and the straight line B61 is 45 degrees is the Z2 direction, Alternatively, the positional deviation or angular deviation corresponding to 0.2 dots of the second mirror 34 before and after the change of the environment inside the image display device is as shown in FIG.

  FIG. 19 shows a positional deviation or an angular deviation of the second mirror 34 corresponding to a positional deviation of 0.2 dots on the two-dimensional image plane.

  For example, the angle shift in the β2 direction of the second mirror 34 corresponding to a position shift of 0.2 dots on the two-dimensional image plane is 0.12 minutes, the angle shift in the α2 direction is 0.12 minutes, and the angle in the γ2 direction The deviation is 5 degrees. Further, the positional deviation in the X2 direction of the second mirror 34 corresponding to a positional deviation of 0.2 dots on the two-dimensional image plane is 1.75 mm, and the positional deviation in the Z2 direction is 3.5 μm.

  As described above, a slight positional shift or angular shift between the first mirror 33 and the second mirror 34 causes a color shift of the image. However, the first mirror 33 and the second mirror 34 are combined with a low thermal expansion coefficient. Since it is fixed to the pedestal prism 32 formed of quartz, it is difficult for position shift and angle shift to occur with respect to temperature change and humidity change inside the image display device.

  For example, when the temperature inside the image display device is changed from room temperature by 40 degrees, the angle deviation of the first mirror 33 in the direction indicated by the arrow A41 in FIG. 13 is 6 seconds, and the angle deviation is indicated by the arrow A42. The angular deviation of the second mirror 34 in the direction is 6 seconds. Actually, the change (increase) of the temperature in the image display device is about 10 degrees, so the angle deviation of the first mirror 33 in the direction indicated by the arrow A41 and the angle of the second mirror 34 in the direction indicated by the arrow A42. The deviations are estimated to be about 1.5 seconds each. In this case, the positional deviation on the two-dimensional image plane is 0.05 dot, and the positional deviation of the red light emitted from the light source 11-1 and the positional deviation of the blue light emitted from the light source 11-3 are 0.05 dots, respectively. It can be seen that there is almost no color shift in the image.

  When the temperature inside the image display device is changed from room temperature by 40 degrees, the first mirror 33 tilts (rotates) in the direction indicated by arrow A41 in FIG. 13 for 6 seconds, and the second mirror 34 The state is tilted for 6 seconds in the direction indicated by arrow A42 in FIG. When the temperature inside the image display device is returned to room temperature from that state, the first mirror 33 and the second mirror 34 return to the state before the temperature inside the image display device is changed (the state where there is no angular deviation). .

  As described above, the first mirror 33 and the second mirror 34 are pressed against and fixed to the pedestal prism 32 formed of synthetic quartz having a low thermal expansion coefficient. If the temperature is stable, the positions of the first mirror 33 and the second mirror 34 are also stable (because the positions do not vary). The position of the mirror 34 can be adjusted.

  Furthermore, in the conventional method of fixing a plate-shaped mirror by providing a groove in a base made of metal, the thermal expansion coefficient of the base and the thermal expansion coefficient of the plate-shaped mirror are greatly different. When the temperature changes, the plate-shaped mirror is distorted and the displayed image is distorted. However, the first mirror 33 and the second mirror 34 are replaced with the base prism 32 having the same thermal expansion coefficient as shown in FIG. Since the upper portion in the drawing of the first mirror 33 and the second mirror 34 is not stressed by being pressed and fixed to the first mirror 33 and the second mirror 34, the first mirror 33 and the second mirror 34 are not distorted. Since deviation and angle deviation are less likely to occur, the displayed image is less likely to be distorted and color deviation is less likely to occur.

  As described above, according to the present invention, each surface of the first mirror and the second mirror is abutted against the side surface of the pedestal prism, and the first mirror and the second mirror are fixed to the pedestal prism. The plate-like first mirror and the second mirror can be fixed to the base (base prism) more easily and with higher accuracy.

  Although the first mirror 33 and the second mirror 34 have been described as having a wedge shape, a parallel plate may be used.

  In addition, it has been described that light incident from the one-dimensional light modulation element 12 is combined in the color combining unit 13, but not only the one-dimensional light modulation element 12 but light incident from a liquid crystal display device is combined in the color combining unit 13. It may be.

  In this case, for example, as illustrated in FIG. 20, the image display apparatus includes a light source 201-1 to light source 201-3, a liquid crystal display device 202-1 to liquid crystal display device 202-3, a color composition unit 13, and an enlarged projection system. The image display apparatus projects light on the screen 204 to display a two-dimensional image on the screen 204.

  Each of the light sources 201-1 to 201-3 is made of, for example, a metal halide lamp, and emits white light so as to enter the liquid crystal display devices 202-1 to 202-3. Each of the liquid crystal display device 202-1 through the liquid crystal display device 202-3 transmits light of a predetermined wavelength with a predetermined intensity for each pixel out of the light incident from each of the light sources 201-1 through 201-3. A transmissive liquid crystal display device.

  For example, the liquid crystal display device 202-1 transmits light (red light) for displaying a red image out of the light incident from the light source 201-1, and enters the color composition unit 13. In addition, the liquid crystal display device 202-2 transmits light (green light) for displaying a green image out of the light incident from the light source 201-2, and enters the color composition unit 13 so that the liquid crystal display device 202- 3 transmits the light (blue light) for displaying a blue image out of the light incident from the light source 201-3 and causes the light to enter the color composition unit 13.

  The color synthesizing unit 13 synthesizes light incident from the liquid crystal display devices 202-1 to 202-3, and projects the synthesized light onto the screen 204 via the enlargement projection system 203. Display an image.

  Furthermore, in FIG. 9, the incident light can be decomposed (separated) in the color composition unit 13 by making the light enter from the direction in which the light synthesized in the color composition unit 13 is emitted. That is, when light is incident on the color combining unit 13 from the right side in FIG. 9, red light of the incident light is reflected upward on the surface 84 of the second mirror 34 in the figure.

  Then, green light and blue light out of the light incident on the color composition unit 13 pass through the second mirror 34 as it is and enter the first mirror 33. Further, of the light incident on the first mirror 33, the blue light is reflected downward in the figure on the surface 45 of the first mirror 33, and the green light is transmitted through the first mirror 33 as it is. As described above, the color composition unit 13 can also separate incident light. For example, the color composition unit 13 can be applied to a 3CCD camera or the like.

  In this case, the light incident on the 3CCD camera is incident on the second mirror 34, and the red light is reflected on the second mirror and incident on the CCD (imaging device). On the other hand, the green light and the blue light transmitted through the second mirror 34 as they are enter the first mirror 33. Then, the blue light is reflected by the first mirror 33 and enters the CCD, and the green light passes through the first mirror 33 as it is and enters the CCD.

It is a figure which shows the structural example of the image display apparatus to which this invention is applied. It is a perspective view which shows the more detailed structural example of a color synthetic | combination part. It is a perspective view which shows the more detailed structural example of a color synthetic | combination part. It is a figure which shows the direction which fixes a 1st mirror and a 2nd mirror to a base prism. It is a figure explaining attachment to the base of a support part. It is a figure explaining the fixing method to the base prism of a 2nd mirror. It is a figure which shows the direction which fixes a 2nd mirror to a base prism. It is a figure explaining the synthetic | combination of the light in a color synthetic | combination part. It is a figure explaining the synthetic | combination of the light in a color synthetic | combination part. It is a figure explaining the external shape of a 1st mirror and a 2nd mirror. It is a figure which shows the tolerance of a 1st mirror and a 2nd mirror. It is a flowchart explaining the process of an assembly. It is a figure which shows the direction in which a 1st mirror and a 2nd mirror incline. It is a figure explaining the position shift which arises when the 1st mirror and the 2nd mirror tilt. It is a figure explaining the position shift which arises when the 1st mirror and the 2nd mirror tilt. It is a figure which shows the direction of the position shift and angle shift | offset | difference of a 1st mirror. It is a figure explaining the magnitude | size of the position shift and angle shift | offset | difference of a 1st mirror equivalent to the position shift for 0.2 dots in a two-dimensional image surface. It is a figure which shows the direction of the position shift and angle shift | offset | difference of a 2nd mirror. It is a figure explaining the magnitude | size of the position shift and angle shift | offset | difference of a 2nd mirror equivalent to the position shift for 0.2 dots in a two-dimensional image surface. It is a figure which shows the structural example of the image display apparatus to which this invention is applied.

Explanation of symbols

  12-1 to 12-3 One-dimensional light modulation element, 13 color synthesis unit, 31 base, 32 pedestal prism, 33 first mirror, 34 second mirror, 43 side surface, 44 side surface, 45 surface, 46 surface, 71 support unit , 72 support parts, 73 plates, 74 plates

Claims (6)

A plate-like first mirror that transmits or reflects incident light as it is;
A plate-like second mirror that transmits or reflects incident light as it is;
A fixing table having a first surface for fixing the first mirror and a second surface for fixing the second mirror provided to form a predetermined angle with the first surface. And
The first mirror has the third surface of the first mirror abutted against the first surface of the fixed base and is fixed to the fixed base, and the second mirror has the second mirror An optical element, wherein a fourth surface of a mirror is abutted against the second surface of the fixed base and fixed to the fixed base. The first mirror transmits the light of the first color of the three primary colors incident from the surface of the first mirror facing the third surface as it is and enters the second mirror. And reflecting the light of the second color among the three primary colors of light incident from the third surface to be incident on the second mirror,
The second mirror is a surface of the second mirror that transmits the first color light and the second color light incident from the fourth surface as they are and faces the fourth surface. Reflecting the light of the third color among the three primary colors of the light incident from the light, and combining the light of the first color, the light of the second color, and the light of the third color. The optical element according to claim 1. The first mirror is formed in a wedge shape such that the third surface and the surface of the first mirror facing the third surface form a predetermined angle,
The second mirror is formed in a wedge shape so that the fourth surface and the surface of the second mirror facing the fourth surface form a predetermined angle. Item 2. The optical element according to Item 1. The first mirror and the second mirror are constituted by dichroic mirrors,
The optical element according to claim 1, wherein the fixing base is made of synthetic quartz. In the method of manufacturing an optical element,
A plate-like first mirror that transmits or reflects incident light as it is is abutted against and fixed to the first surface for fixing the first mirror of the fixing base,
A plate-like second mirror that transmits or reflects incident light as it is is provided to fix the second mirror provided so as to form a predetermined angle with the first surface of the fixing base. A manufacturing method characterized by being abutted against and fixed to the second surface. First modulation means for modulating light of the first color among the three primary colors of light;
Second modulation means for modulating light of the second color among the three primary colors of light;
A fixing base having a first surface and a second surface provided to form a predetermined angle with the first surface;
A plate-like first mirror which is fixed by being abutted against the first surface of the fixing base, which transmits or reflects the light of the first color incident from the first modulation means as it is. When,
The second color incident from the second modulation means is transmitted through the first color light incident from the first mirror as it is and opposed to the surface on which the first color light is incident. A second plate-shaped second plate that is fixed by being abutted against the second surface of the fixed base, which combines the light of the first color and the light of the second color by reflecting the light of the first color. Mirror,
An image display apparatus comprising: a projecting unit configured to project an image obtained by projecting light obtained by combining the light of the first color and the light of the second color.

Images