JP2006171287A - Illuminator, projection-type video display device using the same, and optical hexahedron - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminator or the like that can make ample light quantity compatible with heat discharging function. <P>SOLUTION: An optical hexahedron 6 having square planes is formed. The optical hexahedron 6 comprises an exit light face 60, formed on one side face and having exits formed like a matrix in each of cell lenses and incident ports formed at least two faces except the exit light face 60 and having optical paths formed in a relation of 1:1 to any one of the exits. Cell lenses 3a of first fly-eye lenses 3 and light emitting elements of light sources corresponding to the cell lenses 3a are arranged dispersedly at the incident port. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an illumination device, a projection display apparatus using the illumination device, and an optical hexahedron.

2. Description of the Related Art In recent years, a projection display apparatus used for a liquid crystal projector or the like is known that uses an LED (light emitting diode) element as a light source from the viewpoint of power saving (for example, Patent Document 1).
JP 2004-226614 A

  In a projection display apparatus using LED elements as light sources, it is necessary to gather a large number of LED elements in a matrix and obtain a sufficient amount of light. However, in that case, since the heat dissipation effect of the lost heat is deteriorated, it is difficult to obtain a practical light amount using the LED element.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an illuminating device capable of achieving both a sufficient amount of light and a heat dissipation function, a projection display device using the same, and an optical hexahedron. .

  In order to solve the above problems, the present invention provides a light source having a plurality of light emitting elements, a first fly eye lens having a cell lens provided for each light emitting element of the light source, and a cell lens of the first fly eye lens. In each of the illuminating devices including the second fly-eye lens having the cell lenses arranged in a matrix, the emission ports are formed in a matrix on one surface for each cell lens. An optical hexahedron provided on an outgoing light surface and at least two surfaces excluding the outgoing light surface and having an outgoing port and an incident port formed with an optical path in a 1: 1 relationship is provided. The illumination device is characterized in that a cell lens of a lens and light emitting elements of a light source corresponding to the cell lens are dispersedly arranged at the entrance.

  In this aspect, when the fly eye lens pair is provided to constitute the integrator, the cell lenses constituting the first fly eye lens are dispersedly arranged at the respective entrances of the optical hexahedron, so that the integration degree of the second fly eye lens is increased. On the other hand, the integration degree of the light emitting elements constituting the light source is reduced to at least one half. As a result, the necessary amount of light can be sufficiently obtained, and the heat dissipation effect of lost heat is enhanced.

  In a preferred embodiment, each optical path length formed in the optical hexahedron is set equal.

  In this aspect, since the light incident from each incident port is irradiated from the output port through the optical path having the same length, the light from the first fly-eye lens can be imaged equally on the second fly-eye lens. It becomes possible.

  In another preferred aspect, the entrance of the optical hexahedron includes a first incident light surface facing the outgoing light surface, and second and third incident light surfaces configured on side surfaces adjacent to the first incident light surface. And the second incident light surface is made to be opposite to each other in the horizontal direction and the vertical direction in which the emission ports are arranged, and the incident ports of the second incident light surface The incident ports on the incident light surface are alternately arranged in the vertical direction so as to avoid interference with the optical path of the incident port formed on the first incident light surface.

  In this aspect, the arrangement of the entrances of the first to third incident light surfaces can be set in a repetitive pattern, which facilitates dimension setting and specification design.

  In another preferred embodiment, the optical hexahedron has a reflecting surface that guides the optical path of each incident port orthogonal to the exit port at a right angle.

  In this aspect, it is possible to easily irradiate light from a plurality of entrances formed in the optical hexahedron from the same outgoing light surface only by combining the reflecting surfaces.

  In another preferred embodiment, the reflection surface is formed of a metal deposited on a resin reflection member.

  In this aspect, the reflecting surface can be configured with relatively easy processing.

  In another preferred embodiment, the optical hexahedron includes a partition plate that is stacked in the vertical direction of the emission port, and a support member that supports the partition plate at equal intervals.

  In this aspect, it is possible to easily manufacture an optical hexahedron having a complicated optical path by stacking the partition plates vertically.

  In another preferable aspect, the cell lens of the first fly-eye lens is an integrated molded product.

  In this aspect, since a plurality of cell lenses are integrated in a predetermined unit, a lens group with high dimensional accuracy can be configured. There is also an advantage that adjustment at the time of assembly is simplified.

  In another preferred embodiment, the light emitting element is composed of a light emitting diode.

  In this aspect, since the light emitting element is composed of an inexpensive light emitting diode, the light source can be manufactured at low cost.

  According to another aspect of the present invention, in the projection display apparatus using the above-described illumination device, a plurality of the illumination devices that individually irradiate light of three colors having different wavelengths, and light from a light source of each illumination device. And a color composition unit that synthesizes and irradiates.

  In this aspect, since the light can be combined from the plurality of illumination devices that irradiate light of different wavelengths by the color combining means, colored irradiation light can be obtained.

  In another preferable aspect of the projection display apparatus, the second fly-eye lens of the illuminating device is composed of a single second fly-eye lens arranged on the downstream side of the optical path irradiated by the light combining means.

  In this aspect, since a common second fly-eye lens is employed when a plurality of illumination devices are employed, the number of parts can be reduced, and the distance between each illumination device and the color combining means can be set short. As a result, it is possible to contribute to downsizing of the entire apparatus.

  In another preferred embodiment of the projection display apparatus, the three colors are red, green and blue.

  This aspect is suitable for projecting a natural color image.

  Another aspect of the present invention provides a light source having a plurality of light emitting elements, a first fly eye lens having a cell lens provided for each light emitting element of the light source, and a cell lens of the first fly eye lens. An optical hexahedron used in an illuminating device including a second fly-eye lens having cell lenses arranged in a matrix, and an outgoing light surface configured on one surface, and the outgoing light surface, Each cell lens has an exit port formed in a matrix and an exit port provided on at least two surfaces excluding the exit light surface and having an exit path and a light path formed in a 1: 1 relationship. The incident ports are respectively formed on a first incident light surface facing the outgoing light surface and second and third incident light surfaces formed on side surfaces adjacent to the first incident light surface, The entrance of the first incident light surface is aligned with the exit. The second and the third incident light surfaces are opposed to each other in the vertical direction and the vertical direction, and the incident ports of the second incident light surface and the third incident light surface are connected to the optical path of the incident port formed on the first incident light surface. The optical hexahedrons are alternately arranged in the vertical direction so as to avoid interference.

  In a preferred embodiment, the optical hexahedron has a reflecting surface that guides the optical path of each of the incident ports orthogonal to the output port at a right angle.

  In a preferred embodiment, the reflecting surface of the optical hexahedron is made of metal deposited on a resin-made reflecting member.

  In a preferred embodiment, the optical hexahedron includes a partition plate that is stacked in the vertical direction of the emission port, and a support member that supports the partition plate at equal intervals.

  As described above, according to the present invention, when the fly eye lens pair is provided to configure the integrator, the integration degree of the light emitting elements constituting the light source is at least 1/2 with respect to the integration degree of the second fly eye lens. Reduced to As a result, the necessary amount of light can be sufficiently obtained, and the heat dissipation effect of the lost heat is enhanced, so that a remarkable effect that both the sufficient amount of light and the heat dissipation function can be achieved is achieved. In addition, since the first fly-eye lens is dispersedly arranged, even if the substrate of the light source becomes larger than the first fly-eye lens, the dimensional difference can be absorbed, so the degree of freedom in design is also high. There is an advantage of becoming.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic plan view showing a main part of a projection display apparatus 100 according to an embodiment of the present invention, and FIG. 2 shows a schematic configuration of a lighting apparatus 10 employed in the projection display apparatus 100. It is a perspective view shown.

  Referring to the drawings, the projection display apparatus 100 according to the illustrated embodiment is a so-called three-plate type, and the three illumination devices 10R, 10G, and 10B and the lights from the illumination devices 10R, 10G, and 10B are used. A dichroic prism 12 to be combined, a projection lens 14 that projects light from the dichroic prism 12 onto a screen (not shown), and a light source lighting control unit 40 that controls each illumination device 10 are provided.

  The illumination device 10R emits red light, the illumination device 10G emits green light, and the illumination device 10B emits blue light. These illumination devices 10R, 10G, and 10B include LED (light emitting diode) arrays 1R, 1G, and 1B, condenser lens groups 2R, 2G, and 2B, first fly-eye lenses 3R, 3G, and 3B, and a second fly-eye lens 5R. 5G, 5B, optical hexahedrons 6R, 6G, 6B, a pair of condensing lenses 7R, 8R, 7G, 8G, 7B, 8B disposed downstream of the second fly array lenses 5R, 5G, 5B and the downstream side It includes liquid crystal display panels 9R, 9G, 9B on which light from the condenser lenses 8R, 8G, 8B is imaged. In the following description, R, G, and B at the end of the reference numerals represent the respective emission colors (R: red, G: green, B: blue), and particularly when the emission colors need not be distinguished. Are omitted.

  The LED arrays 1R, 1G, and 1B are LEDs in which LEDs that generate red, green, and blue light, respectively, are arranged in a matrix having a predetermined rule. Note that the entire LED arrays 1R, 1G, and 1B or each corresponds to a specific example of the light source of the present invention. The LED arrays 1R, 1G, and 1B are all specific examples of the light source of the present invention, and each of the LED arrays 1R, 1G, and 1B is a specific example of the first to third light sources of the present invention, that is, the first, second, and third light sources. This also applies. Each LED element constituting the LED array 1 corresponds to a specific example of the light emitting element of the present invention. Each LED element is molded with a transparent resin, and the transparent resin is formed in a convex shape to constitute a lens cell of the condenser lens group 2. The LED element and the lens cell may be round. In this embodiment, it is formed in a rectangular shape and further corresponds to the aspect ratio of the liquid crystal display panel 9.

  The condenser lens group 2 collects a wide range of divergent light generated by the corresponding LED array 1 and emits a substantially parallel light beam. The individual lenses constituting the condenser lens group 2 are individually opposed to the LEDs constituting the LED array 1.

  Referring to FIG. 2, the first fly-eye lens 3 is similarly disposed so as to face the LED array 1, and collects light irradiated from the facing LED array 1 and transmitted through the condenser lens group 2. It is. In this embodiment, as shown in FIG. 2, cell lenses 3 a constituting the first fly's eye lens 3 are dispersedly arranged by using an optical hexahedron 6. Each cell lens 3a of the first fly-eye lens 3 is integrally formed with a resin frame body 3b.

  The second fly-eye lens 5 includes rectangular cell lenses 5a arranged in a matrix and a frame body 5b that integrates the cell lenses 5a. Each cell lens 5a has a 1: 1 relationship with any one of the cell lenses 3a of the first fly-eye lens 3, and individually focuses the light transmitted through the cell lens 5a. The cell lens 5a of the second fly-eye lens 5 is set to be similar to each cell lens 3a of the first fly-eye lens 3. In the first fly-eye lens 3 and the second fly-eye lens 5, each cell lens 3a, 5a is depicted as a single convex lens, but the present invention is not limited to this.

  Each of the cell lenses 3 a and 5 a of the first and second fly's eye lenses 3 and 5 corresponds to the aspect ratio of the liquid crystal display panel 9.

  3 to 6 are perspective views showing a schematic configuration of the optical hexahedron 6 according to the embodiment of the present invention.

  Referring to these drawings, the optical hexahedron 6 is a cube or a rectangular parallelepiped whose plane is formed in a square, and an outgoing light surface 60 is formed on one side surface thereof. The exit light surface 60 has exit ports 6 a formed in a matrix for each cell lens 5 a corresponding to the aspect ratio of the second fly-eye lens 5. Of each surface excluding the outgoing light surface 60, a side surface (hereinafter referred to as “first incident light surface”) 61 facing the outgoing light surface 60, and both side surfaces (hereinafter referred to as “first incident light surface”) adjacent to the first incident light surface 61. In the present embodiment, the incident ports 61a, 62a, and 63a each having an optical path formed in a 1: 1 relationship with any of the emission ports 6a are formed in the second and third incident light surfaces 62 and 63, respectively. Has been.

  7 and 8 show a schematic configuration of the optical hexahedron 6, in which (A) is a schematic plan view showing an optical path for each layer, and (B) is a perspective view of a layer corresponding to (A). FIG. 9 is an enlarged perspective view showing a part of members employed in the optical hexahedron 6.

  Referring to these drawings, light from a plurality of incident light surfaces (for example, the first incident light surface 61 and the second incident light surface 62, or the first incident light surface 61 and the third incident light surface 63) is output in a specific manner. In order to guide light with the same optical path length in association with the opening 6a, the optical hexahedron 6 has a structure in which partition plates 66 having mirrors 65 are vertically stacked. The mirror 65 is embodied by a mirror finish by depositing aluminum or an aluminum alloy on a plastic plate. The mirror 65 corresponds to a specific example of a member constituting the reflecting surface of the present invention.

  As shown in FIG. 9, in order to attach the mirror 65 to the partition plate 66, a pair of guide bars 67 are erected at fixed positions of the partition plate 66, and slits 67 a formed in both guide bars 67. , 67a, the mirror 65 is equally arranged in a posture inclined at an angle of 45 ° in plan view with respect to each side of the partition plate 66. In FIG. 7B and FIG. 8B, 68 is a base and 69 is a support. These base 68 and support | pillar 69 correspond to the specific example of the support member of this invention.

  In the illustrated example, a mirror 65 is disposed in an odd-numbered layer from the lowest layer so as to transmit light from the first incident light surface 61 and light from the second incident light surface 62 (FIG. 7). In the even-numbered layer, the mirror 65 is disposed so as to transmit the light from the first incident light surface 61 and the light from the third incident light surface 63 (see FIG. 8).

  Referring to FIG. 7 (A) and FIG. 8 (A), this will be described in more detail. Temporarily, the first incident light surface 61 is equally divided for each of the exit ports 6a of the exit light surface 60, and this is divided into rows. When the second and third incident light surfaces 62 and 63 are equally divided at the same pitch into a column, in one layer (in the illustrated example, the odd-numbered layer shown in FIG. 7), even rows Are formed with an entrance 61a of the first incident light surface 61, mirrors 65 are arranged in odd-numbered rows and odd-numbered columns, and entrance ports 62a of the second incident light surface 62 are formed in each odd-numbered column. It is supposed to be blocked. The mirrors 65 are arranged at positions where the odd rows and the odd columns intersect, and are fixed so as to guide the light from the incident ports 62a of the second incident light surface 62 to the emission ports 6a of the corresponding rows.

  Further, in the other layer (in the illustrated example, the even-numbered layer shown in FIG. 8), the entrance 61a of the first incident light surface 61 is formed in the odd-numbered rows, and the mirror 65 is arranged in the even-numbered odd-numbered columns. Thus, the incident ports 62a of the second incident light surface 62 are formed in the odd-numbered columns, and the even-numbered columns are closed. Each mirror 65 is arranged at a position where even-numbered rows and odd-numbered columns cross each other, and is fixed so as to guide light from the entrance 63a of the third incident light surface 63 to the exit 6a of the corresponding row.

  The arrangement of each mirror 65 is such that the sum of the distance from the corresponding incident apertures 62a, 63a to the mirror 65 and the distance from the mirror 65 to the corresponding exit aperture 6a is from the incident aperture 61a of the first incident light surface 61. It is set at a position equal to the distance to the corresponding exit 6a.

  Thus, in the illustrated embodiment, the first incident light surface 61 facing the outgoing light surface 60 and the second and third incident light surfaces 62 formed on the side surfaces adjacent to the first incident light surface 61. , 63 are formed in the incident ports 61a, 62a, 63a, respectively, and the incident ports 61a of the first incident light surface 61 are arranged in the lateral direction in which the exit ports 6a are arranged (FIGS. 7A and 8A). In the row direction) and in the vertical direction (in the stacking direction in FIGS. 7B and 8B), every other face is made to face the exit ports 6a, and the entrance ports 62a and the third entrance of the second incident light surface 62 The incident ports 63a of the light surface 63 are alternately arranged in the vertical direction so as to avoid interference with the optical path of the incident port 61a formed in the first incident light surface 61 (see FIG. 2).

  As a result, in the projection display apparatus 100 according to the present embodiment, the heat radiation effect is enhanced while maintaining the light quantity of the LED array 1.

  Next, referring to FIG. 1, the condensing lenses 7 and 8 guide the light emitted from the second fly-eye lens 5 to the liquid crystal display panel 9.

  Each liquid crystal display panel 9 includes an incident-side polarizing plate, a panel unit in which liquid crystal is sealed between a pair of glass substrates (pixel electrodes and alignment films are formed), and an output-side polarizing plate. . The modulated light (each color video light) modulated by passing through the liquid crystal display panel 9 is synthesized by the dichroic prism 12 to become color video light. The color image light is enlarged and projected by the projection lens 14 and projected and displayed on the screen. The aspect ratio of the liquid crystal display panel 9 corresponds to the aspect ratio of the image to be displayed. For example, in order to display an image compliant with NTSC, which is a standard standard for television broadcasting, the aspect ratio of the liquid crystal display panel 9 is set to 4/3, and high-definition television (HDTV; so-called high-definition TV) broadcasting is performed. Is set to 16/9 to display an image conforming to the standard, and is set to 5/4 to display an image conforming to SXGA of a personal computer display.

  The dichroic prism 12 is a cube or a rectangular parallelepiped, and has four right-angle prisms joined together. The junction portion includes a first dichroic mirror portion 12a that reflects blue light transmitted through the first fly-eye lens 3B at a right angle with respect to an incident angle of 45 degrees, and transmits red and blue light; A second dichroic mirror portion 12b that reflects light at a right angle with respect to an incident angle of 45 degrees and transmits green and blue light is formed. With this configuration, all the three colors of light transmitted through the second fly-eye lens 5 are incident on the projection lens 14. This dichroic prism 4 corresponds to a specific example of the color composition means of the present invention.

  The projection lens 14 corresponds to a specific example of the projection optical system of the present invention.

  The light source lighting control unit 40 sequentially turns on the LED arrays 1R, 1G, and 1B that generate three colors of light in a time-sharing manner, so that the projection light of the projection lens 14 can be displayed on an external screen (not shown). An optical image will be projected.

  According to the above configuration, when the lens array (first and second fly's eye lenses 3 and 5) is provided to configure the integrator, the cell lens 3a constituting the first fly's eye lens 3 is connected to each incident port 61a of the optical hexahedron 6. , 62a and 63a are dispersedly arranged, and the degree of integration of the light emitting elements constituting the light source is reduced to at least one half of the degree of integration of the second fly-eye lens 5. As a result, the necessary amount of light can be sufficiently obtained, and the heat dissipation effect of lost heat is enhanced.

  Moreover, in this embodiment, each optical path length formed in the optical hexahedron 6 is set equal, as is apparent from FIGS. 7A and 8B. Accordingly, the light incident from each of the entrances 61a, 62a, 63a is irradiated from the exit 6a through the optical path having the same length, so that the light from the first fly-eye lens 3 is incident on the second fly-eye lens 5. It is possible to image equally.

  In the present embodiment, the optical hexahedron 6 includes a first incident light surface 61 facing the outgoing light surface 60 and second and third incident light surfaces formed on the side surfaces adjacent to the first incident light surface 61. 62 and 63 are formed with entrances 61a, 62a and 63a, respectively, and the entrances 61a of the first entrance light surface 61 are made to face the exits 6a every other side in the horizontal and vertical directions where the exits are arranged. The incident port 62a of the second incident light surface 62 and the incident port 63a of the third incident light surface 63 are respectively moved up and down so as to avoid interference with the optical path of the incident port 61a formed in the first incident light surface 61. They are staggered in the direction. Therefore, the arrangement of the incident ports 61a, 62a, 63a of the first to third incident light surfaces 63 can be set in a repeated pattern, and dimension setting and specification design are facilitated.

  In the present embodiment, the optical hexahedron 6 includes a mirror 65 that guides the optical path of each of the incident ports 61a, 62a, and 63a perpendicular to the output port 6a at a right angle. Therefore, as shown in FIGS. 7A and 7B and FIGS. 8A and 8B, a plurality of entrances 61a, 62a, and 63a formed in the optical hexahedron 6 can be easily formed only by combining the mirror 65. Can be irradiated from the same outgoing light surface 60.

  In the present embodiment, the mirror 65 is made of a metal (aluminum or aluminum alloy) deposited on a resin reflecting member. Accordingly, the mirror 65 can be configured with relatively easy processing.

  Moreover, in this embodiment, the optical hexahedron 6 is comprised by the laminated body on which the partition plate 66 is laminated | stacked on the up-down direction of the output port 6a. Therefore, the optical hexahedron 6 having a complicated optical path can be easily manufactured.

  Further, the cell lens 3a of the first fly-eye lens 3 according to the present embodiment is an integrated resin molded product (see FIG. 2). Therefore, since the plurality of cell lenses 3a are integrated in a predetermined unit, a lens group with high dimensional accuracy can be configured. There is also an advantage that adjustment at the time of assembly is simplified.

  In addition, the light emitting element according to the present embodiment is composed of a light emitting diode. Therefore, the light source can be manufactured at low cost.

  Further, in the present embodiment, a plurality of illumination devices 10R, 10G, and 10B that individually irradiate light of three colors having different wavelengths, and a color that is emitted by combining light from the light sources of the illumination devices 10R, 10G, and 10B. And a dichroic prism 12 as a synthesizing means. Therefore, light can be synthesized from a plurality of illumination devices 10R, 10G, and 10B that irradiate light of different wavelengths, so that colored irradiation light can be obtained. Further, since the three colors are red, green and blue, it is suitable for projecting a natural color image.

  As described above, according to the present invention, when an integrator is configured by providing lens arrays (first and second fly-eye lenses 3 and 5), a light source is used with respect to the integration degree of the second fly-eye lens 5. The degree of integration of the constituent light-emitting elements is reduced to at least 1/2 (1/2 for the first incident light surface 61, and 1/4 for the second and third incident light surfaces 62 and 63, respectively). As a result, the necessary amount of light can be sufficiently obtained, and the heat dissipation effect of the lost heat is enhanced, so that a remarkable effect that both the sufficient amount of light and the heat dissipation function can be achieved is achieved. Further, even when the substrate of the LED (light emitting diode) array 1 as a light source becomes larger than the first fly-eye lens 3 due to the first fly-eye lens 3 being dispersedly arranged, the dimensional difference is absorbed. Therefore, there is an advantage that the degree of freedom in design is increased.

  The above-described embodiments are merely examples of preferred specific examples of the present invention, and the present invention is not limited to the above-described embodiments.

  FIG. 10 is a perspective view showing a schematic configuration of the optical hexahedron according to still another embodiment of the present invention, and FIGS. 11 to 14 are schematic plan views showing a part of layers of the optical hexahedron.

  With reference to these drawings, as the incident light surface of the optical hexahedron 6, in addition to the first to third incident light surfaces 61 to 63 described above, the upper surface 64 can be configured as an incident light surface. In this case, the number of lens arrays is set to a multiple of 4 (8 rows × 8 columns in the illustrated example). For example, for the odd layer (FIGS. 11 and 13), the first incident light surface 61 is used. The light from the incident port 61a of the second incident light surface 62 and the incident port 62a of the second incident light surface 62 are irradiated with light from the incident port 62a of the second incident light surface 62 through the output port 6a by the mirror 65, and an even layer ( 12 and 14), light from the incident port 63 a of the third incident light surface 63 and the incident port 64 a from the upper surface 64 are introduced, and light from the incident port 63 a of the third incident light surface 63 is The light is emitted from the exit 6 a by the mirror 65, and the light from the entrance 64 a on the upper surface 64 is emitted from the exit 6 a by the prism 165. Furthermore, as is clear from FIGS. 11 to 14, each partition plate 66 is provided with an opening 660 that opens the prism 165 provided in the lower layer to the upper surface 64 when going to the upper layer. The prism 165 corresponds to a specific example of a member constituting the reflecting surface of the present invention.

  When this configuration is adopted, the integration degree of the first fly's eye lens 3 on the first incident light surface 61 can be dispersed to ¼ or less. When the optical hexahedron 6 cannot be formed into a cube due to the aspect ratio, the light source from the upper surface 64 may be separated from the optical hexahedron 6 for each column so that the optical path lengths are aligned.

  In place of the upper surface 64, the lower surface may be the incident light surface.

  Furthermore, the lighting device of the present invention can be employed in a single-plate projection display apparatus. In that case, a dichroic prism 12 may be disposed upstream of the condenser lens 7 and a single second fly-eye lens 5 may be employed between the dichroic prism 12 and the condenser lens 7. . In this case, you may make it arrange | position LED of the color in which luminous efficiency is not good in the 1st incident light surface 61 side.

  It goes without saying that various modifications can be made within the scope of the claims of the present invention.

1 is a schematic plan view showing a main part of a projection display apparatus according to an embodiment of the present invention. It is a perspective view which shows schematic structure of the illuminating device employ | adopted as the projection type video display apparatus. It is a perspective view which shows schematic structure of the optical hexahedron which concerns on embodiment of this invention. It is a perspective view which shows schematic structure of the optical hexahedron which concerns on embodiment of this invention. It is a perspective view which shows schematic structure of the optical hexahedron which concerns on embodiment of this invention. It is a perspective view which shows schematic structure of the optical hexahedron which concerns on embodiment of this invention. FIG. 2 shows a schematic configuration of the optical hexahedron, in which (A) is a schematic plan view showing an optical path for each layer, and (B) is a perspective view of a layer corresponding to (A). FIG. 2 shows a schematic configuration of the optical hexahedron, in which (A) is a schematic plan view showing an optical path for each layer, and (B) is a perspective view of a layer corresponding to (A). 4 is a perspective view showing a part of members employed in the optical hexahedron 6 in an enlarged manner. FIG. It is a perspective view which shows schematic structure of the same optical hexahedron which concerns on another embodiment of this invention. 2 is a schematic plan view showing a part of a layer of the same optical hexahedron. 2 is a schematic plan view showing a part of a layer of the same optical hexahedron. 2 is a schematic plan view showing a part of a layer of the same optical hexahedron. 2 is a schematic plan view showing a part of a layer of the same optical hexahedron.

Explanation of symbols

1R, 1G, 1B Light source array 2R, 2G, 2B Condensing lens group 3R, 3G, 3B First fly eye lens (an example of a lens array pair)
5R, 5G, 5B Second fly-eye lens (an example of a lens array pair)
6 Optical hexahedron 6a Exit 7R, 7G, 7B Condensing lens 8R, 8G, 8B Condensing lens 9R, 9G, 9B Liquid crystal display panel 10R, 10G, 10B Illuminating device 12 Dichroic prism 14 Projection lens 40 Light source lighting control unit 60 Exit Emitting surfaces 61-63 First to third incident light surfaces 61a, 62a, 63a, 64a Incident port 64 Upper surface 65 Mirror (an example of a reflecting surface)
66 Partition plate 68 Base (an example of a support member)
69 Support (an example of a support member)
100 Projection Display Device 165 Prism (Example of Reflecting Surface)

Claims (15)

A light source having a plurality of light emitting elements, a first fly eye lens having a cell lens provided for each light emitting element of the light source, and provided for each cell lens of the first fly eye lens, arranged in a matrix In an illumination device including a second fly-eye lens having a cell lens,
An exit light surface formed in a hexahedron and having exit surfaces formed in a matrix for each cell lens on one surface, and provided on at least two surfaces excluding the exit light surface. An optical hexahedron having an entrance with an optical path formed in relation,
An illumination device, wherein a cell lens of the first fly-eye lens and a light emitting element of a light source corresponding to the cell lens are dispersedly arranged at the entrance. The lighting device according to claim 1.
The optical path length formed in the said optical hexahedron is set equal, The illuminating device characterized by the above-mentioned. The lighting device according to claim 1 or 2,
The incident ports of the optical hexahedron are respectively formed on a first incident light surface facing the outgoing light surface and second and third incident light surfaces formed on side surfaces adjacent to the first incident light surface. ,
Make the entrance of the first incident light surface face every other exit in the horizontal and longitudinal directions of the exit,
The incident ports of the second incident light surface and the incident ports of the third incident light surface are alternately arranged in the vertical direction so as to avoid interference with the optical path of the incident port formed on the first incident light surface. A lighting device characterized by comprising: The lighting device according to any one of claims 1 to 3,
The optical hexahedron has a reflecting surface that guides the optical path of each incident port orthogonal to the exit port at a right angle. The lighting device according to claim 4.
The said reflecting surface is formed with the metal vapor-deposited on resin-made reflecting members, The illuminating device characterized by the above-mentioned. The lighting device according to any one of claims 1 to 5,
The optical hexahedron includes a partition plate stacked in a vertical direction of an emission port, and a support member that supports the partition plate at equal intervals. In the illuminating device of any one of Claim 1 to 6,
The cell lens of the first fly-eye lens is an integrated molded product. The illumination device according to any one of claims 1 to 7,
The illuminating device, wherein the light emitting element is formed of a light emitting diode. In the projection type video display apparatus using the illuminating device of any one of Claim 1 to 8,
A plurality of the illumination devices that individually irradiate light of three colors having different wavelengths;
A projection-type image display device comprising: color composition means for synthesizing and irradiating light from the light sources of each illumination device. The projection display apparatus according to claim 9, wherein
The projection type image display device, wherein the second fly's eye lens of the illumination device comprises a single second fly's eye lens disposed on the downstream side of the optical path irradiated by the light combining means. The projection display apparatus according to claim 9 or 10,
The projection display apparatus characterized in that the three colors are red, green, and blue. A light source having a plurality of light emitting elements, a first fly eye lens having a cell lens provided for each light emitting element of the light source, and provided for each cell lens of the first fly eye lens, arranged in a matrix An optical hexahedron used in an illumination device including a second fly-eye lens having a cell lens,
An outgoing light surface configured on one surface;
On this outgoing light surface, outgoing ports formed in a matrix for each cell lens,
Provided on at least two surfaces excluding the outgoing light surface, and having either one of the outgoing ports and an incident port formed with an optical path in a 1: 1 relationship;
The incident ports are respectively formed on a first incident light surface facing the outgoing light surface, and second and third incident light surfaces configured on side surfaces adjacent to the first incident light surface,
Make the entrance of the first incident light surface face every other exit in the lateral and longitudinal directions of the exit,
The incident ports of the second incident light surface and the incident ports of the third incident light surface are alternately arranged in the vertical direction so as to avoid interference with the optical path of the incident port formed on the first incident light surface. An optical hexahedron characterized by The optical hexahedron according to claim 12,
An optical hexahedron having a reflecting surface that guides the optical path of each incident port orthogonal to the output port at a right angle. The optical hexahedron according to claim 13, wherein
The said reflecting surface is formed with the metal vapor-deposited on the resin-made reflecting members, The optical hexahedron characterized by the above-mentioned. The optical hexahedron according to any one of claims 12 to 14,
An optical hexahedron comprising: a partition plate stacked in the vertical direction of the emission port; and a support member that supports the partition plate at equal intervals.

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