JP2015138600A - photosynthesis unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photosynthesis unit capable of easily changing the synthesis of a plurality of bunches of laser beams.SOLUTION: A photosynthesis unit according to the present invention is configured so that lenses L1, L2, L3, L4, and Lo, a color wheel 120, a motor 130, mirrors M, dichroic mirrors DM are disposed within a housing 110. First to fourth bunches of laser beams Lb1, Lb2, Lb3, and Lb4 in a blue band are input to the housing 110 from one surface thereof and converged onto the color wheel 120 by the lenses L1, L2, L3, and L4 of a shift optical system. R light, G light, B light, and Y light emitted from the color wheel 120 are synthesized by the lens Lo and resultant light is output.

Description

  The present invention relates to a photosynthesis unit that uses an array light source that emits laser light in the blue band, and more particularly to a light source unit and an illumination optical system that use the photosynthesis unit.

  It is known that a blue laser emitter is used as a light source for a light source unit of a projector (Patent Document 1). The light source unit includes a blue laser emitter, a phosphor wheel, and a plurality of reflecting mirrors and dichroic mirrors. The phosphor wheel has a disk shape rotated by a motor, and the phosphor wheel has a transmission part that transmits blue band light, and a phosphor that emits blue band light in red band and green band. Each layer is formed.

Japanese Patent No. 4711154

  In order to generate a large-screen projection image such as in a movie theater, the light output of the light source unit must be increased accordingly. On the other hand, for personal or business use, the light output of the light source unit can be small because the screen is not so large. At present, the array of blue lasers and the illumination optical system have to be designed according to the light output required for the light source unit, which is very complicated.

  An object of the present invention is to provide a photosynthesis unit that can easily change the synthesis of a plurality of laser beam bundles.

  The photosynthesis unit of the present invention includes an input unit capable of inputting at least one blue-band laser beam bundle, a first blue-band laser beam bundle having a first optical axis, and a first optical axis different from the first optical axis. A second blue-band laser beam bundle having two optical axes, a first circumferential region optically scanned by the first laser beam bundle, and an optical scan by the second laser beam bundle. A rotating body including a second circumferential region, a first lens having an optical axis different from the first optical axis, and condensing the first laser beam bundle in the first circumferential region, A second lens having an optical axis different from the second optical axis and condensing the second laser beam bundle on the second circumferential region, and light emitted from the first circumferential region and the second A synthetic lens that synthesizes light emitted from the circumferential region, and the first circumferential region includes a reflective region that reflects light in a blue band; A phosphor region that generates light having a wavelength different from that of the blue band by light of the blue band, and the first circumferential region is different from the blue band by light of the blue band and a reflection region that reflects light of the blue band. And the input section, the rotating body, the first and second lenses, and the synthetic lens are provided in a housing.

  Preferably, the photosynthetic unit includes a motor that rotates the rotating body. Preferably, the light combining unit further includes a third blue band laser beam bundle having a third optical axis, and a fourth blue band laser beam bundle having a fourth optical axis different from the third optical axis. A third lens that has an optical axis different from the third optical axis, a third lens that focuses the third laser beam bundle on the first circumferential region, and an optical axis that is different from the fourth optical axis, And a fourth lens that focuses the fourth laser beam bundle on the second circumferential region. Preferably, the photosynthesis unit further includes a third blue-band laser beam bundle having a third optical axis, and a fourth blue-band laser beam bundle having a fourth optical axis different from the third optical axis; A third lens having an optical axis different from the third optical axis, condensing the third laser beam bundle on the first circumferential region, an optical axis different from the fourth optical axis, A fourth lens that focuses the four laser beam bundles onto the second circumferential region, a first circumferential region that is optically scanned by the third laser beam bundle, and a fourth laser beam bundle. A second rotating body including a second circumferential region that is optically scanned; and a second motor that rotates the second rotating body. Preferably, an optical system for guiding light from the rotating body to the synthetic lens is disposed in the housing. Preferably, the input unit is formed on one surface of the housing, and the first to fourth light bundles are input from one surface of the housing.

  According to the present invention, the light output can be easily changed. Further, according to the present invention, it is possible to provide a common platform-based photosynthesis unit for light source units having different required light outputs.

It is a figure explaining the principle of the illumination optical system which concerns on the 1st Example of this invention. It is a schematic sectional drawing which shows the structural example of the array light source shown in FIG. 3A is a plan view of the phosphor wheel of the present embodiment, and FIG. 3B is a cross-sectional view taken along the line XX. FIG. 4A is a diagram illustrating a state in which light in the blue band is reflected by the phosphor wheel according to the present embodiment, and FIG. 4B is a diagram illustrating the red band / green band by the phosphor wheel according to the present embodiment. It is a figure explaining a mode that light is reflected. FIG. 5A is a diagram for explaining the principle of an illumination optical system according to the second embodiment of the present invention, and FIG. 5B is a plan view of a phosphor wheel used in the second embodiment, FIG. FIG. 5C is a diagram for explaining the combined luminance of the R, G, and B lights combined according to the second embodiment. FIG. 6A is a top view illustrating a schematic configuration of the photosynthetic unit according to the embodiment of the present invention, and FIG. 6B is a schematic side view illustrating the upper side and the lower side of the housing. It is a top view which shows the typical structure of the other photosynthesis unit based on the Example of this invention. It is a top view which shows the typical structure of the other photosynthesis unit based on the Example of this invention. It is a top view which shows the typical structure of the other photosynthesis unit based on the Example of this invention. It is a figure which shows the illumination optical system using the photosynthesis unit which concerns on the Example of this invention. It is a top view which shows the relationship between the optical filter wheel of FIG. 10, and a laser beam bundle. It is a figure which shows the illumination optical system using the other photosynthesis unit which concerns on the Example of this invention. It is a figure which shows the illumination optical system using the photosynthesis unit which concerns on the Example of this invention. It is a figure which shows the illumination optical system using the photosynthesis unit which concerns on the Example of this invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. In a preferred aspect of the present invention, the illumination optical system uses a blue laser element or an array light source in which blue light emitting diodes are arrayed as a semiconductor light emitting element that emits blue light having a short wavelength. In a further preferred aspect, the illumination optical system is used in a projector that reflects light by a light modulation device such as DLP or DMD. It should be noted that the scale of the drawings is emphasized for easy understanding of the features of the invention and is not necessarily the same as the scale of an actual device.

  FIG. 1 is a diagram for explaining the basic principle of an illumination optical system according to the first embodiment of the present invention. In the following description, red band light, green band light, and blue band light may be abbreviated as R, G, and B for convenience.

  The illumination optical system 10 of the present embodiment includes an array light source 20 that emits blue band laser light as excitation light, front group lenses L1 and L2 that condense the laser light from the array light source 20, and a front group lens L1. , Rear group lenses L3 and L4 for condensing the laser light collected by L2 on the phosphor wheel 50, a dichroic mirror 30 that transmits light in the blue band and reflects light in the red band and green band, Reflected by a reflection mirror 40 disposed at the rear of the dichroic mirror 30 and at the same angle as the dichroic mirror 30, a disk-shaped phosphor wheel 50, a motor 60 that rotates the phosphor wheel 50, and the dichroic mirror 30. L5 that collects the red band light and the green band light that has been reflected, and the blue band light that has been reflected by the reflecting mirror 40, and a condensing lens 5 by configured to include a light tunnel 70 that transmits the light collected. The light emitted from the light tunnel 70 is guided to a spatial modulation device such as DMD (not shown), an optical fiber, or the like. The condensing lens L5 and the light tunnel 70 are not necessarily essential, and can be replaced or changed to an optical system according to the light source of the applied electronic device.

  The array light source 20 includes a plurality of semiconductor laser elements (or blue light-emitting diodes) that emit blue-band laser light in an array. The plurality of semiconductor laser elements are arranged one-dimensionally or two-dimensionally, and the plurality of semiconductor laser elements are driven at the same time, so that laser light is emitted from each semiconductor laser element all at once.

  FIG. 2 is a schematic cross-sectional view showing one configuration example of the array light source. As shown in the figure, a substrate on which a plurality of semiconductor laser elements are mounted is supported by a support member 22 made of a metal material having high thermal conductivity, such as aluminum. A lens 24 for collimating the laser light emitted from each semiconductor laser element is attached to the surface of the support member 22. Further, a reflection mirror 26 is disposed on the side facing the support member 22, and the reflection mirror 26 reflects blue band light emitted from each semiconductor laser element in a certain direction to generate a laser beam bundle Lb.

  The front group lens L1 is composed of, for example, a plano-convex lens and condenses the laser beam Lb from the array light source 20, and the front group lens L2 is composed of, for example, a concave lens, and is separated from the array light source 20 by the front group lenses L1 and L2. The laser beam Lb is condensed into parallel light. The optical axis C1 of the front group lenses L1 and L2 is the center of the lenses L1 and L2. The front group lenses L1 and L2 may be any optical system that can collect the laser beam bundle Lb from the array light source 20, and the number of lenses constituting the front group lens may be one. Or three or more. Further, the lens may be either a spherical lens or an aspheric lens.

  The rear group lenses L3 and L4 are composed of, for example, a combination of a spherical lens such as a convex lens and a concave lens, or an aspheric lens, and the laser beam bundle Lb collected by the front group lenses L1 and L2 is further collected on the phosphor wheel 50. Shine. The optical axis C2 of the rear group lenses L3 and L4 is the center of the lenses L3 and L4. The rear group lenses L3 and L4 may be any optical system that can focus the laser beam bundle Lb on the phosphor wheel 50, and the number of lenses constituting the rear group lens may be one. Or three or more. It should be noted that the illumination optical system 10 of this embodiment is an optical system in which the optical axis C2 of the rear group lenses L3 and L4 is shifted from the optical axis C1 of the front group lenses L1 and L2. The shifts of the optical axes C1 and C2 are adjusted so that the laser beams condensed by the group lenses L1 and L2 are incident on one half of the rear group lens L3.

  The dichroic mirror 30 is disposed on the optical axes C1 and C2, and intersects the optical axes C1 and C2 at an angle of approximately 45 degrees. The dichroic mirror 30 has an optical property of transmitting blue band light and reflecting red band and green band light. For this reason, the light in the blue band collected by the front lens groups L1 and L2 passes through the dichroic mirror 30 and enters one half of the rear lens groups L3 and L4. Further, the dichroic mirror 30 reflects light in the red band and the green band reflected by the phosphor wheel 50 almost at right angles to the optical axis, as will be described later.

  The reflection mirror 40 disposed at the same angle as the dichroic mirror 30 is located at the rear part of the dichroic mirror 30 and reflects the blue band light normally reflected by the phosphor wheel 50 in a direction orthogonal to the optical axes C1 and C2. To do. The reflection mirror 40 can be configured by a total reflection mirror that reflects all wavelengths, or a dichroic mirror that reflects light in the blue band and transmits light in the red and green bands. When the reflection mirror 40 is composed of the latter dichroic mirror, the reflection mirror 40 may be disposed behind or in front of the dichroic mirror 30. More preferably, the reflecting mirror 40 is positioned so as not to block the laser light Lb collected by the front lens groups L1 and L2. However, the positional relationship may be such that the laser beam Lb overlaps the reflection mirror 40.

  The condensing lens L5 condenses the light reflected by the dichroic mirror 30 and the reflecting mirror 40 and makes the collected light enter the light tunnel 70. The optical axis C3 of the lens L5 is the center of the lens L5, and the optical axis C3 is the same as the optical axes of the reflection mirror 40 and the dichroic mirror 30, and is orthogonal to the optical axes C1 and C2. Therefore, the light reflected by the dichroic mirror 30 and the reflection mirror 40 is condensed on the same optical path by the condenser lens L5.

  As described above, the rear lens groups L3 and L4 are arranged between the dichroic mirror 30 and the phosphor wheel 50, and condense the light in the blue band transmitted through the dichroic mirror 30 on the surface of the phosphor wheel 50. As shown in FIG. 3, the phosphor wheel 50 is a disk-like rotating body that is rotated at a constant speed by a motor 60, and the surface thereof reflects the light in the blue band in the circumferential direction. The region 52 includes a first phosphor region 54 that emits light in the red band when excited by light in the blue band, and a second phosphor region 56 that emits light in the green band when excited by light in the blue band. It is out. The reflection region 52, the first phosphor region 54, and the second phosphor region 56 have a certain width in the radial direction, and this width is the width of the spot P collected by the rear group lenses L3 and L4. Somewhat larger than the diameter. In addition, the circumferential lengths of the reflection region 52, the first phosphor region 54, and the second phosphor region 56, that is, the respective inner angles thereof, depend on the required R, G, B luminances, etc. It is selected appropriately.

  In a preferred embodiment, the phosphor wheel 50 includes a base material made of glass, resin, or metal. In a preferred example, the surface of the rotator constitutes a reflecting mirror that reflects light of R, G, and B wavelengths, and the first phosphor region 54 and the second phosphor region 56 are the surfaces of the reflecting mirror. The phosphor layers 54a and 54b are laminated. Further, a reflective layer that reflects at least blue band light may be formed on the surface of the substrate. Further, the reflection region 52 may be formed with irregularities on its surface so as to diffuse the incident blue band light minutely.

  As described above, the first phosphor region 54 includes the phosphor layer 54a that is excited by the blue band laser light and emits the red band light on the surface of the base material. The phosphor layer 54a may be formed on the surface of the base material, or may be formed on the reflective layer by forming a reflective layer on the surface of the base material. It should be noted that the thickness of the phosphor layer 54a shown in FIG. 3B is exaggerated. Similarly, the second phosphor region 56 includes a phosphor layer 56a that is excited by blue band light and emits green band light. The phosphor materials constituting the phosphor layers 54a and 56a include YAG (yttrium, aluminum, garnet), TAG (terbium, aluminum, garnet), sialon, BOS (barium orthosilicate), and nitride compounds. It has been known. The phosphor layers 54a and 56a are, for example, applied on the surface of the base material mixed with a phosphor material and a resin material or a ceramic material, or pasted on the surface of the base material and a sheet-like material mixed with the phosphor material. You may make it attach. Thus, the surface of the phosphor wheel 50 is irradiated with the light in the blue band of the spot P, and the phosphor wheel 50 is rotated so that the reflection region 52 and the first and second phosphor regions 54 and 56 are formed. The spot P is optically scanned.

  In the above example, the phosphor wheel 50 is formed with the phosphor layers 54a and 56a for emitting light in the red band and the green band. However, the light excited by the blue laser light is not necessarily red. It is not limited to light in the band and the green band. For example, a phosphor layer that excites light in the yellow, magenta, and cyan bands may be formed.

  Next, an operation of sequentially generating R, G, and B light will be described with reference to FIG. FIG. 4A shows a state in which blue band light is regularly reflected by the reflection region 52 of the phosphor wheel 50. That is, the parallel light bundles Lb from the front lens groups L1 and L2 are transmitted through the dichroic mirror 30 and incident on one half of the rear lens groups L3 and L4 shifted from the optical axis C2. The light beam Lb irradiates the reflection region 52 of the phosphor wheel 50 by the rear lens groups L3 and L4. At this time, the light beam Lb is regularly reflected, that is, the incident angle and the reflection angle of the light beam Lb with respect to the optical axis C2 are substantially equal. Accordingly, the light beam Lb reflected by the phosphor wheel 50 is emitted from the opposite side of the rear lens groups L3 and L4, and the light Lb passes through the dichroic mirror 30 and is reflected by the reflecting mirror 40 at a substantially right angle. And condensed by the condenser lens L5.

  FIG. 4B shows a state in which red band or green band light is reflected by the first or second phosphor regions 54 and 56 of the phosphor wheel 50. That is, as in the case of FIG. 4A, the light flux Lb in the blue band irradiates the first phosphor region 54. The phosphor layer 54a excited by the light beam Lb emits light in the red band. At this time, the light in the red band becomes light spreading in a Lambertian shape (uniform diffusion). The red band light Lr reflected in a Lambertian shape is condensed by the lenses L4 and L3, and further reflected by the dichroic mirror 30 at a substantially right angle and is incident on the condensing lens L5. This operation is the same when the second phosphor region 56 emits green band light Lg.

  In this way, R, G, and B laser beam bundles are sequentially generated using the blue-band laser light source and directed from the light tunnel 70 to a digital mirror device (DMD) or the like. Although not shown in detail here, the DMD has a plurality of mirror elements formed in a two-dimensional array, and each mirror element is tilted to the first angle or the second angle according to the digital image data and reflected by the DMD. The R, G, and B light generated generates a projection image.

  Thus, according to the present embodiment, the phosphor wheel 50 reflects all of R, G, and B, and the dichroic mirror 30 and the reflection mirror 40 selectively reflect R, G, and B light. Since it did in this way, the optical member required for the illumination optical system 10 can be reduced, and a compact structure can be obtained. In particular, the dichroic mirror 30 and the reflection mirror 40 are arranged so as to overlap in the same direction, and the rear group lenses L3 and L4 are interposed between the dichroic mirror 30 and the phosphor wheel 50, so that space saving is achieved. More promoted.

  Next, a second embodiment of the present invention will be described. FIG. 5 is a diagram showing the principle of the illumination optical system 10A according to the second embodiment. In the second embodiment, two sets of the dichroic mirror 30, the reflection mirror 40, and the rear group lens L used in the first embodiment are provided, and R, G, and B are respectively obtained from two beam bundles separated by the beam splitter. Generated and synthesized at the end. However, a plurality of phosphor wheels are used instead of a single one, and two sets of reflection regions and first and second phosphor regions are formed on the surface in the circumferential direction. Further, the rear lens group L is constituted by a single lens.

  As shown in the figure, the parallel light bundles Lb from the front lens groups L1 and L2 are separated into two light bundles Lb1 and Lb2 by the beam splitter 200. As for the separated light bundle Lb1, as in the first embodiment, R, G, and R via the dichroic mirror 30, the rear group lens L, the phosphor wheel 50A, the dichroic mirror 30 or the reflection mirror 40 are used. The B light is incident on the condenser lens L5. As shown in FIG. 5B, the light beam Lb1 is focused on the outer peripheral side of the phosphor wheel 50A, and the reflection region 52, the first and second phosphor regions 54, 56 are optically moved at the spot P. Scan.

  The other light beam Lb2 is reflected substantially at right angles by the reflecting mirror 210 and is made parallel to the light beam Lb1. The center of the reflection mirror 210 or the optical axis C4 is shifted from the optical axis C2 of the rear group lens LA, and the light beam Lb2 is incident on one half of the rear group lens LA via the dichroic mirror 30A. The incident light bundle Lb2 is focused on the spot Q on the inner peripheral side of the phosphor hole 50A by the rear group lens LA, and the reflection region 82 and the first and second phosphor regions 84 and 86 are optically reflected by the spot Q. To scan. The light Lb2 in the blue band reflected by the phosphor wheel 50A is reflected almost at right angles by the reflecting mirror 40A via the dichroic mirror 30A, and the light in the red band and the green band reflected by the phosphor wheel 50A is The light is reflected at a substantially right angle by the dichroic mirror 30A and enters the condenser lens L5. FIG. 5C represents the combined luminance when the luminances of R, G, and B of the spot P and the spot Q are combined. The arrangement of the reflection region 52 on the outer peripheral side on the phosphor wheel 80A, the first and second phosphor regions 54 and 56, the reflection region 82 on the inner peripheral side, and the first and second phosphor regions 84 and 86 The arrangement is adjusted so that the timings at which R, G, and G are generated are synchronized.

  Next, a photosynthesis unit according to the third embodiment of the present invention will be described. The photosynthetic unit 100 of this embodiment includes a substantially hexahedral rectangular housing 110. On one side surface of the housing 110, an input portion for inputting a blue band laser beam is formed. The input unit can be, for example, an opening for transmitting the laser beam bundle into the housing. Alternatively, in another aspect, a convex lens or a concave lens may be attached to the opening of the input unit to collimate the input laser beam bundle. Furthermore, one or a plurality of convex lenses or concave lenses may be arranged in the housing, and the laser beam bundle input from the input unit may be collimated in the housing.

  Four laser beam bundles Lb1 to Lb4 in the blue band are input through the opening serving as the input unit. The laser beam bundles Lb1 and Lb2 are input to the inside from the lower side of the opening, and the laser beam bundles Lb3 and Lb4 are input from the upper side of the opening. For example, as shown in FIG. 6B, the optical system having the optical axis C1 on the lower side and the optical system having the optical axis C2 on the upper side are separated from the reference C of the opening as a boundary. In a preferred embodiment, the input aperture can be machined into a shape that allows the array light sources to be mechanically and thermally coupled. Alternatively, the opening of the input portion can be processed into a shape that allows the support member 22 including the array light source as shown in FIG. 2 to be mechanically and thermally coupled. An output unit is provided on the side surface opposite to the side surface on which the input unit is provided, and the output unit outputs the light combined in the housing to the outside.

  The laser beam bundles Lb1 to Lb4 are emitted from, for example, an array light source as shown in FIG. Here, an example in which four laser beam bundles Lb1 to Lb4 are input is shown, but the number of input laser beam bundles can be arbitrarily selected. For example, the input laser beam bundle may be one, two, three, or four. Also, the number of array light sources can be equal to or less than the number of laser beam bundles. For example, when the number of input laser beam bundles is four, the number of array light sources may be four. If a beam splitter is used as shown in FIG. 5, the number of array light sources may be less than the number of laser beam bundles.

  A plurality of lenses, a mirror, and a color wheel are attached inside the housing 110. The photosynthesis unit can apply the principle of photosynthesis of the second embodiment shown in FIG. That is, the light combining unit shown in FIG. 6 includes two sets of main components of the illumination optical system shown in FIG. A first color wheel 120 </ b> A is attached to one side surface of the housing 110. The first color wheel 120A is rotated around the optical axis C1 on the lower side from the reference line C, as shown in FIG. The second color wheel 120B is attached to the side surface facing this. The second color hole 120B is rotated around the upper optical axis C2. As shown in FIG. 5B, the first and second color holes 120A and 120B include a reflection region 52, first and second phosphor regions 54 and 56, a reflection region 82, first and Second phosphor regions 84 and 86 are formed, respectively. The first and second color wheels 120A and 120B are rotated by the motor 130 so as to be synchronized.

  The laser beam bundle Lb1 is reflected by the mirror M1, and the reflected beam bundle Lb1 is collected on the color wheel 120A by the condenser lens L1. For example, the light beam Lb1 is focused on the spot P of the color wheel 120A. The blue band light is regularly reflected by the color wheel 120A, and the R and G lights are reflected in a Lambertian pattern. The light beam Lb1 in the blue band is reflected by the mirror M1A and is incident on the lens Lo, and the R and B lights are reflected by the dichroic mirror M1 and are incident on the lens Lo. In the following description, M represents a mirror that reflects blue band light (including a total reflection mirror), and DM represents a dichroic mirror that transmits blue band light and reflects R and B light.

  The laser beam bundle Lb2 is reflected by the mirror M2, and the reflected beam bundle Lb2 is collected on the color wheel 120A by the condenser lens L2. For example, the light beam Lb2 is focused on the spot Q of the color wheel 120A. The R, G, and B lights reflected by the color wheel 120A are reflected toward the lens Lo by the mirror M2A and the dichroic mirror DM2, as in the above embodiment.

  The laser beam bundle Lb3 is reflected by the mirror M3, and the reflected beam bundle Lb3 is collected on the color wheel 120B by the condenser lens L3. For example, the light beam Lb3 is focused on the spot Q of the color wheel 120B. The R, G, and B lights reflected by the color wheel 120B are reflected toward the lens Lo by the mirror M3A and the dichroic mirror DM3, as in the above embodiment.

  The laser beam bundle Lb4 is reflected by the mirror M1, and the reflected beam bundle Lb4 is condensed on the color wheel 120B by the condenser lens L4. For example, the light beam Lb4 is focused on the spot P of the color wheel 120B. The R, G, and B lights reflected by the color wheel 120B are reflected toward the lens Lo by the mirror M4A and the dichroic mirror DM4, as in the above embodiment.

  The R, G, and B lights reflected by the color wheels 120A and 120B are adjusted so as to be synchronized with each other. Therefore, four R, G, and B lights are incident on the lens Lo in synchronization. . The four laser beam bundles are respectively incident on four quadrants centered on the optical axis of the lens Lo, and four light irradiation patterns 140 as shown in the figure can be obtained.

  The photosynthesis unit 100A shown in FIG. 7 is a further miniaturized version of FIG. 6, and the same reference numerals are assigned to the same components. By appropriately arranging the mirror M and the dichroic mirror DM in the housing, it is possible to obtain an irradiation pattern of four condensed light bundles from the lens Lo as in the case of FIG.

  FIG. 8 is a diagram illustrating another configuration example of the further photosynthesis unit. This photosynthesis unit is configured using a single color wheel 120, and the four laser beam bundles Lb1 to Lb4 are input from the left side surface. The beam bundles Lb1 and Lb2 are input from the lower side, and the beam bundles Lb3 and Lb4 are input from the upper side. Two sets of reflection areas (B reflection, R and G phosphor areas) on the color wheel 120 are optically scanned by four light bundles. The reflected light of R, G, and B by each light bundle. So that the B reflection region and the R and G phosphor regions are set.

  FIG. 9 is a further modification of the photosynthesis unit shown in FIG. This photosynthesis unit receives a laser beam bundle from the left and right side surfaces of the housing. That is, the light beam Lb1 is input from the lower side of the left side surface, the light beam Lb3 is input from the upper side, the light beam Lb2 is input from the lower side of the right side, and the light beam Lb4 is input from the upper side.

  FIG. 10 is a diagram showing an example of an illumination optical system using the light combining unit shown in FIG. The PCW1 is configured in the same manner as the color wheel 120 shown in FIG. 9 and is rotated by the motor M1, but the PCW1 includes a phosphor region in the yellow band (Y) in addition to the R and G phosphor regions. Is the only different power. Collimated beam bundles Lb1 to Lb4 are input from the left and right of the photosynthesis unit 100C and collected on the color wheel 120 via the mirrors and dichroic mirrors M1, M2, M3, and M4, and the condenser lenses L1, L2, L3, and L4. Even if the R, G, B light is reflected from there, a combined illumination pattern of four light bundles combined by the condenser lens L5 is generated. These four combined beam bundles enter the light tunnel LT via the optical filter wheel OCW2.

  The optical filter wheel OCW2 is rotated by the motor M1, and this rotation is synchronized with the rotation of the color hole PCW1. As shown in the figure, the optical filter wheel OCW2 has a diffusion region that transmits B, a dichroic region that reflects B and transmits R, a dichroic region that reflects B and transmits G, and reflects B and transmits Y. And a dichroic area to perform. The R, G, and Y light bundles output from the condenser lens L5 include the blue component light that is regularly reflected, but such blue component light is removed by the optical filter wheel OCW2. Accordingly, light of R, G, B, and Y in which color mixing of light in the blue band is suppressed is incident on the light tunnel LT.

  FIG. 11 shows a schematic plan view of the optical filter wheel OCW2. The optical filter wheel OCW2 includes four filter regions 150, 152, 154, and 156 in the radial direction, and the light bundles Lb1 to Lb4 collected by the lens L5 are collected in each filter region. Each filter region 150, 152, 154, 156 includes a B transmission region, a B reflection R transmission region, a B reflection G transmission region, and a B reflection Y transmission region, as described above. The light bundles Lb1, Lb2, Lb3, and Lb4 are adjusted so that R, G, B, and Y are simultaneously filtered.

FIG. 11A shows an illumination optical system using a light combining unit of still another modification. As shown in the figure, laser beam bundles 1 to 4 are incident from the left and right of the housing. A color wheel PCW1 is disposed at the center of the housing, and laser beam bundles are respectively irradiated on both sides of the color wheel PCW1, where R, G, B, and Y light are reflected. In the example shown in the figure, two color wheels are stacked in order to improve heat dissipation, but a reflective region and a phosphor region may be formed on the front and back of a single color wheel. The light beams of the laser beam bundles 3 and 4 are incident on the synthesis lens Lo via the total reflection folding mirror.
Since the photosynthesis unit of this example uses a single motor, it can further contribute to miniaturization of the housing.

  FIG. 12 is a modification of FIG. 10 and shows an example in which the optical system is bent and arranged so that the optical axis of the optical filter wheel OCW2 is orthogonal to the optical axis of the color wheel PCW1. FIG. 13 shows an example in which laser light sources are arranged in the vertical direction.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to specific examples, and a plurality of examples are appropriately combined from the first to seventh examples. It may be. The present invention can be variously modified and changed within the scope of the gist of the present invention described in the claims.

100: Photosynthesis unit 110: Housing 120A, 120B: Color wheel 130: Motor 150, 152, 154, 156: Filter area PCW1: Color wheel OCW2: Optical color wheel M: Reflection mirror DM: Dichroic mirrors L1, l2, l3, L4 : Lens Lo: Synthetic lens LT: Light tunnel

Claims (6)

An input unit capable of inputting a laser beam bundle of at least one blue band;
A first blue band laser beam bundle having a first optical axis;
A second blue-band laser beam bundle having a second optical axis different from the first optical axis;
A rotating body including a first circumferential region optically scanned by a first laser beam bundle and a second circumferential region optically scanned by a second laser beam bundle;
A first lens having an optical axis different from the first optical axis and condensing the first laser beam bundle on the first circumferential region;
A second lens having an optical axis different from the second optical axis and condensing the second laser beam bundle in the second circumferential region;
A synthetic lens that synthesizes light emitted from the first circumferential region and light emitted from the second circumferential region;
The first circumferential region includes a reflective region that reflects light in the blue band, and a phosphor region that generates light having a wavelength different from that of the blue band by the blue band light,
The first circumferential region includes a reflective region that reflects light in the blue band, and a phosphor region that generates light having a wavelength different from that of the blue band by the blue band light,
The light combining unit, wherein the input unit, the rotating body, the first and second lenses, and the combining lens are provided in a housing. The photosynthetic unit according to claim 1, wherein the photosynthetic unit includes a motor that rotates the rotating body. The photosynthesis unit further includes a third blue band laser beam bundle having a third optical axis,
A fourth blue-band laser beam bundle having a fourth optical axis different from the third optical axis;
A third lens having an optical axis different from the third optical axis and condensing the third laser beam bundle in the first circumferential region;
3. The photosynthesis unit according to claim 1, further comprising: a fourth lens having an optical axis different from the fourth optical axis and condensing the fourth laser beam bundle on the second circumferential region. Photosynthesis unit
A third blue-band laser beam bundle having a third optical axis;
A fourth blue-band laser beam bundle having a fourth optical axis different from the third optical axis;
A third lens having an optical axis different from the third optical axis and condensing the third laser beam bundle in the first circumferential region;
A fourth lens having an optical axis different from the fourth optical axis and condensing the fourth laser beam bundle on the second circumferential region;
A second rotating body including a first circumferential region optically scanned by a third laser beam bundle and a second circumferential region optically scanned by a fourth laser beam bundle;
The photosynthesis unit according to claim 1, further comprising a second motor that rotates the second rotating body. 5. The light combining unit according to claim 1, wherein an optical system for guiding light from a rotating body to the combining lens is disposed in the housing. The photosynthetic unit according to claim 1, wherein the input unit is formed on one surface of the housing, and the first to fourth light bundles are input from one surface of the housing.