JP2014154214A - Array light source, and illumination optical system using the array light source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an array light source capable of reducing the size and saving the space.SOLUTION: An illumination optical system comprises: a first array light source 30 including a plurality of semiconductor laser elements arrayed in a matrix direction, for outputting optical beams from the individual semiconductor laser elements; a second array light source 40 arranged to face the first array light source 30 and including a plurality of semiconductor laser elements arrayed in the matrix direction, for outputting optical beams from the individual semiconductor laser elements; and array mirrors 100 and 200 arranged between the first and second array light sources for reflecting the laser beams from the first and second array light sources, in an X-direction. The array mirror 100 includes a plurality of reflection mirrors 102 for reflecting the lights of the individual lines of the first array light source 30, and the array mirror 200 includes a plurality of reflection mirrors 202 for reflecting the lights of the individual lines of the second array light source 40 in the X-direction.

Description

  The present invention relates to an array light source including a semiconductor laser element that emits laser light in a red band, a green band, and a blue band.

  In recent years, semiconductor lasers that emit laser light in the red band, the green band, and the blue band have been developed and are being put to practical use. If a semiconductor laser can be used as a light source, a reduction in power consumption, a longer life, and a reduction in size can be expected as compared with a conventional lamp light source such as halogen.

  Patent Document 1 discloses a light source device that includes a reflection unit that reflects light from first and second solid-state light source units that are opposed to each other, and a fluorescent light-emitting plate that is excited by the light of the reflection unit. Patent Document 2 discloses a lighting device in which light emitting element units each having a laser diode arranged in an array are arranged to face each other, and light from each light emitting element unit is reflected by a reflection mirror.

JP 2012-133337 A JP2012-118129A

  In the light source device or the illumination device disclosed in Patent Documents 1 and 2, a reflection mirror that reflects light from the array light source is arranged between two array light sources arranged opposite to each other, and a plurality of laser beam bundles are arranged. The structure which takes out is disclosed.

  However, such a conventional light source device or illumination device has the following problems. Since laser light is very coherent, its optical axis must be adjusted more accurately. When a plurality of semiconductor laser elements are arrayed, the optical axis must be adjusted so that the optical axes between the semiconductor laser elements are aligned. Such adjustments are usually performed by skilled personnel, but are very cumbersome and require a lot of time. In particular, after the semiconductor laser element is mounted on the array light source, since the semiconductor laser element is fixed, it is practically difficult to adjust the position of the semiconductor laser element.

  Further, when the reflection mirror having the configuration as in Patent Document 2 is used, the pitch in the row direction of the laser diodes of the light emitting element unit becomes large, and such a configuration necessarily increases the density and size of the lighting device. Not suitable for.

  It is an object of the present invention to solve such a conventional problem and provide an array light source and an illumination optical system using the array light source that are reduced in size and space.

  An array light source according to the present invention includes a semiconductor laser element that generates light of at least one of a blue band, a green band, and a red band, and includes a plurality of semiconductor laser elements arranged in a matrix direction, A first array light source unit that outputs light from each semiconductor laser element in a first direction; and a plurality of semiconductor laser elements arranged in a matrix direction. A second array light source unit that outputs in a second direction opposite to the direction, and the first and second array light sources disposed between the first array light source unit and the second array light source unit. And an array mirror that reflects the laser beam output from the unit in a third direction, and the array mirror reflects the light in each row of the first array light source unit in the third direction. Multiple first reflecting mirrors are formed A first array member, and a second array member on which a plurality of second reflection mirrors that reflect light in each row of the second array light source unit in a third direction are formed. These array members and the second array member are stacked so as to intersect each other.

  Preferably, the reflection surface of the first reflection mirror can be adjusted in a three-dimensional direction, and the reflection surface of the second reflection mirror can be adjusted in a three-dimensional direction. In a preferred embodiment, the first array member and the second array member have the same configuration, and the second array member is in a positional relationship obtained by inverting the first array member. Preferably, the first reflection mirror extends stepwise, the first reflection mirror corresponds to the pitch in the row direction of the semiconductor laser elements of the first array light source, and the second reflection mirror is stepped. The second reflecting mirror corresponds to the pitch in the row direction of the semiconductor laser elements of the second array light source. Preferably, the first and second reflection mirrors are coupled to the base portion by a magnetic force through a ball-shaped joint. Preferably, the first and second reflecting mirrors are fixed to the base portion with resin. Preferably, the position in the column direction of each row of the first array light source unit is alternately different from the position in the column direction of each row of the second array light source unit.

  In another preferred aspect, the position in the column direction of each row of the first array light source unit is equal to the position in the column direction of each row of the second array light source unit. In this case, the first array member includes a reflection mirror that reflects light from the second array light source unit on the back surface of the first reflection mirror, and the second array member includes the back surface of the second reflection mirror. And a reflection mirror for reflecting the light from the first array light source unit.

  Preferably, the first array light source unit includes red band, green band, and blue band semiconductor laser elements in one row, and the second array light source unit includes red band, green band, and A blue-band semiconductor laser element is disposed. Preferably, the first array light source unit includes semiconductor laser elements of a red band, a green band and a blue band for each row, and the second array light source unit includes a red band and a green band for each row. In addition, a semiconductor laser element in the blue band is disposed. Preferably, the illumination optical system includes an optical member that performs illumination using light from the array light source configured as described above. Preferably, the optical member includes a reflecting member that turns back the light emitted from the array light source in the opposite direction, and at least some of the optical members of the illumination optical system are disposed in the upper and lower or left and right side spaces of the array light source.

  According to the present invention, since the light from the first and second array light sources is reflected by the first and second array members stacked so as to cross each other, the size of the array light source can be reduced. Space can be saved. Furthermore, according to the present invention, since the reflecting surfaces of the first and second reflecting mirrors of the first and second array members can be adjusted in a three-dimensional direction, the light of the semiconductor laser element after mounting on the array light source can be obtained. The axis can be adjusted easily.

It is a block diagram which shows the structure of the light source device which concerns on the 1st Example of this invention. It is a figure which shows the structure of the array light source which concerns on the 1st Example of this invention. In the array light source according to the first embodiment of the present invention, FIG. 3 (A) is a diagram for explaining how the laser light in the first row of the first array light source is reflected, and FIG. It is a figure explaining a mode that the laser beam of the 1st line of the 2nd array light source is reflected. It is a perspective view which shows the structure of the one part array mirror of the array light source which concerns on 1st Example of this invention. FIG. 5A is a perspective view of the array mirror according to the first embodiment of the present invention, and FIG. 5B is a cross-sectional view of the array mirror. It is a figure which shows the structure of the array light source which concerns on the 2nd Example of this invention. FIG. 7A is a diagram for explaining a state in which the first row laser light of the first and second array light sources is reflected, and FIG. 7B is two rows of the first and second array light sources. It is a figure explaining a mode that the laser beam of eyes is reflected. It is a schematic side view of the illumination optical system which concerns on the 3rd Example of this invention. It is a schematic top view of the illumination optical system according to the third embodiment of the present invention. An example of the color wheel used for the illumination optical system which concerns on the 3rd Example of this invention is shown, FIG. 10 (A) is a top view, FIG.10 (B) is the XX sectional drawing. It is a figure which shows the structural example of the illumination optical system which concerns on the 4th 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 array light source is configured using semiconductor laser elements that emit light in the red band, the green band, and the blue band, respectively. In another aspect, the array light source is configured using a semiconductor laser element that emits light in a blue band. The semiconductor laser element may be any type of a surface emitting semiconductor laser element and an edge emitting laser element. In a further preferred embodiment, an illumination optical system using a laser beam bundle from an array light source is configured. In an embodiment, the illumination optical system is configured using a space above the array light source, and the illumination optical system including the array light source can be reduced in size and space. Such an illumination optical system is used for a liquid crystal, a light source of a DLP type projector, a light source of an endoscope, a light source of an illumination device, and the like. 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. In the following description, the light in the red band, the light in the green band, and the light in the blue band may be abbreviated as R, G, and B for convenience.

  FIG. 1 is a block diagram showing a configuration of a light source device according to a first embodiment of the present invention. The light source device 10 according to this embodiment includes an array light source 20 including first and second array light sources 30 and 40, a drive circuit 50 that drives the first and second array light sources 30 and 40, and a drive circuit 50. And a control unit 60 for controlling the operation. The control unit 60 can include, for example, a processing device such as a micro controller and a microprocessor, and a memory that stores a program for controlling the processing device. The control unit 60 controls the driving of the first and second array light sources 30 and 40 via the drive circuit 50 to turn on the semiconductor laser elements all at once, or turns R, G, and B at different timings. It can be lit. For example, if the light source device 10 is used in a projector, the control unit 60 controls the drive circuit 50 based on the image data.

  The array light source 20 of the present embodiment has first and second array light sources 30 and 40 divided into two. As will be described later, the first and second array light sources 30 and 40 are arranged to face each other so that laser light is emitted from one array light source toward the other array light source. An array mirror is disposed between the first array light source 30 and the second array light source 40, and the array mirror preliminarily determines the laser light emitted from the first and second array light sources 30, 40. Reflects in the specified direction.

  2A shows a schematic side view, a front view, and a top view of the first array light source 30, and FIG. 2B shows a schematic side view, a front view, and a top view of the second array light source 40. Show. The first array light source 30 preferably includes a support member 32 made of a material having high thermal conductivity, for example, a metal such as aluminum. The support member 32 includes a plurality of semiconductor laser elements or semiconductor laser elements (not shown). Fix the mounted board. The plurality of semiconductor laser elements are arranged in a two-dimensional array of m rows × n columns, but in the example of FIG. 2A, 2 rows × n columns are illustrated for ease of explanation. A condensing lens 34 is attached at a position corresponding to the light exit port of the semiconductor laser element, and the condensing lens 34 condenses or collimates the laser light emitted from the semiconductor laser element.

  The semiconductor laser elements in the first row are arranged at the lowermost part 32A of the support member 32, and the semiconductor laser elements in the second row are arranged at a pitch Py in the column direction. The semiconductor laser elements in each row are arranged at a pitch Px in the row direction, and the positions of the semiconductor laser elements in each row in the X direction are the same.

  The second array light source 40 is configured to include a plurality of semiconductor laser elements arranged in a two-dimensional array of m rows × n columns, but FIG. A row × n columns are illustrated. The arrangement of the semiconductor laser elements of the second array light source 40 may be the same as or different from the arrangement of the semiconductor laser elements of the first array light source 30. Further, the number of semiconductor laser elements included in the second array light source 40 may be equal to or different from the number of semiconductor laser elements included in the first array light source 30.

  The second array light source 40 includes a plurality of semiconductor laser elements and / or a support member 42 that fixes a substrate on which the plurality of semiconductor laser elements are mounted, and a condensing lens 44 that condenses light emitted from the semiconductor laser elements. Have Preferably, the support member 42 has the same size as the support member 32 of the first array light source 30. The second array light source 40 is different from the first array light source 30 in that the semiconductor laser elements in the first row are not arranged in the lowermost part 42A of the support member 42, and are shifted by a half pitch Py / 2 from that. The semiconductor laser elements in the first row are arranged. The semiconductor laser elements in the second row are arranged at positions separated from the semiconductor laser elements in the first row by a pitch Py in the column direction. The pitch in the row direction of the semiconductor laser elements in the first row and the second row is Px, and the position in the X direction of the semiconductor laser elements in each row is the same as the position in the X direction of the semiconductor laser elements in the first array light source. Almost equal.

  Accordingly, when the first and second array light sources 30 and 40 are arranged on the same plane, that is, when the support members 32 and 42 are placed on the same plane, each row of the first array light sources 30 is arranged. The position in the column direction is in a nested relationship (alternate relationship) shifted by Py / 2 with respect to the position in the column direction of each row of the second array light source 40.

  FIG. 3 is a diagram for explaining an array mirror disposed between the first and second array light sources 30 and 40. FIG. 3A illustrates an example in which light from the semiconductor laser elements in the first row of the first array light source 30 is reflected in the X direction, and FIG. 3B illustrates the second array light source 40. In the example, light from the semiconductor laser element in the first row is reflected in the X direction.

  As shown in FIG. 3A, between the first array light source 30 and the second array light source 40, there are reflection mirrors arranged at a pitch corresponding to the pitch Px in the row direction of the semiconductor laser elements. An array mirror 100 formed in a step shape is attached. Although details of the array mirror will be described later, the array mirror 100 is extended in a diagonal direction in a space formed between the first array light source 30 and the second array light source 30, and at this time, the array mirror 100 Each of the reflection mirrors 100 reflects light from each semiconductor laser element arranged in the first row of the first array light source 30 in the X direction at a substantially right angle.

  As shown in FIG. 3B, between the first array light source 30 and the second array light source 40, there are reflection mirrors arranged at a pitch corresponding to the pitch Px in the row direction of the semiconductor laser elements. An array mirror 200 formed in a step shape is attached. The array mirror 200 extends in a diagonal direction in the space formed between the first array light source 30 and the second array light source 30 and intersects the array mirror 100 as if the array mirror 100 was inverted. To do. The array mirror 200 reflects the laser light of each semiconductor laser element arranged in the first row of the second array light source 40 in the X direction at a substantially right angle.

  FIG. 4 is a perspective view schematically showing a state in which the pair of array mirrors 100 and 200 shown in FIG. 3 are stacked in the column direction. Although the material of the array mirror 100 is not particularly limited, the array mirror 100 is configured using a material such as metal or plastic resin, for example. The array mirror 100 includes a rectangular reflecting mirror 102 that is inclined at an angle of, for example, 45 degrees with respect to the X direction, and a rectangular connecting portion 104 that extends in the X direction so as to connect the reflecting mirror 102. As a result, the array mirror 100 is configured such that the plurality of reflection mirrors 102 are arranged in a stepped manner. By adjusting the length of the connecting portion 104 in the X direction, the position of each reflection mirror 102 is adjusted to correspond to the pitch of the semiconductor laser elements in the row direction. Further, by adjusting the angle of the reflection mirror 102, the laser light reflected by the reflection mirror 102 can be offset from the X direction.

  On the array mirror 100, the array mirror 200 is laminated so as to intersect with this. Similar to the array mirror 100, the array mirror 200 includes a reflection mirror 202 and a connecting portion 204. In a preferred embodiment, the array mirror 200 has the same configuration as the array mirror 100 and is obtained by inverting the array mirror 100 by 180 degrees with respect to the X direction. At this time, the center part of the array mirror 100 and the array mirror 200 intersect.

  The first row of the second array light source 40 is offset by Py / 2 in the column direction from the first row of the first array light source 30. For this reason, the height in the column direction of the array mirrors 100 and 200 is substantially equal to Py / 2. Thus, the light of the first row of semiconductor laser elements of the first array light source 30 is reflected in the X direction by the array mirror 100, and the first row of semiconductor laser elements of the second array light source 40 is reflected by the array mirror 200 in the X direction. Is reflected. Such a set of array mirrors 100 and 200 is laminated in a plurality according to the number of semiconductor laser elements mounted on the first and second array light sources 30 and 40. As shown in FIG. 2, if the configuration is 2 rows × n columns, it is a set of array mirrors 100 and 200. If the configuration is 4 rows × n columns, the two sets of array mirrors 100, 200 are Laminated.

  Next, a detailed configuration of the array mirror of this embodiment will be described. As described above, the array mirror 100 includes a plurality of reflection mirrors 102 arranged in a staircase pattern. However, in a preferred embodiment, the reflection mirror 102 has a position adjusting function for changing the reflection surface in a three-dimensional direction. Each semiconductor laser element attached to the first and second array light sources 30, 40 is positioned with a certain accuracy in the matrix direction and is fixed to the array light source. However, when the optical axes between the semiconductor laser elements are not perfectly aligned, it is difficult to adjust the position of each of the semiconductor laser elements mounted in the array light source. For this reason, in this embodiment, by adding a position adjusting function to the reflecting mirror 102 corresponding to the semiconductor laser element on a one-to-one basis, the optical axis of the semiconductor laser element can be adjusted after mounting on the array light source. To do.

  FIG. 5A is a perspective view of a part of the array mirror 100. Each reflection mirror 102 is connected by a connecting portion 104, and the pitch Px1 of each reflection mirror 102 is substantially equal to the pitch Px of the semiconductor laser elements in the row direction shown in FIG. 2 (Px1≈Px). Further, the height Py1 in the Z direction (column direction) of the array mirror 100 is substantially equal to the pitch Py of the semiconductor laser elements in the column direction shown in FIG. 2 (Py1≈Py). If the optical axes of the semiconductor laser elements are not aligned, the optical paths of the laser beams in the row direction reflected by the array mirror 100 may not be uniform in the X direction and may be non-uniform. In a preferred mode of this embodiment, the reflecting surface of the reflecting mirror 102 can be freely tilted in the three-dimensional direction, and has a function of arbitrarily adjusting the reflection angle of the laser light from the semiconductor laser element. For example, the reflecting surface of the reflecting mirror 102 is connected to the base via a slidable coupling portion such as a ball joint or a universal joint so that the reflecting surface can be freely tilted in a three-dimensional direction. By adjusting the reflection angle of each reflection mirror 102 of one array mirror, the optical axes of the laser beams in the X direction can be aligned.

  FIG. 5B is a diagram illustrating one configuration example of the reflection mirror, and corresponds to a cross-sectional view taken along line AA in FIG. The reflection mirror 102 includes a reflector 110 on which a reflection surface that reflects light in all wavelength bands of R, G, and B is formed, and a magnet unit 120 having N-pole or S-pole magnetism bonded to the back surface of the reflector 110. , And a base 130 having S or N pole magnetism that is opposite in polarity to the magnet 120.

  The reflector 110 may be a surface of the magnet unit 120 or a reflective surface such as a metal joined thereto, or an optical filter. The magnet unit 120 may be configured by, for example, a material obtained by injection molding a plastic material including a magnetic material, a material obtained by bonding a magnet (magnet) and a plastic member, or the like, or may be configured entirely by a magnet. A spherical concave portion 122 is formed on the back surface of the magnet portion 120 to be joined to the ball-shaped protrusion 132 formed on the base portion 130. For example, the base portion 130 may be formed by injection molding of a plastic material including a magnetic material, or a laminate of a magnet and a plastic member, or may be entirely formed of a magnetic material such as iron. Good.

  The magnet unit 120 can be tilted in a three-dimensional direction via a joint between the recess 122 and the protrusion 132, and adjusts the optical axis of the semiconductor laser element. Preferably, as shown in FIG. 5C, the gap between the magnet portion 120 and the base portion 130 is filled with, for example, an ultraviolet curable resin 140, and when the angle adjustment of the magnet portion 120 is finished, the resin is By irradiating 140 with ultraviolet rays, the resin 140 is cured and the position of the magnet unit 120 is fixed.

  Note that the position adjustment function of the reflection mirror 102 is not limited to the configuration shown in FIG. For example, a protrusion may be provided at each corner of the reflection mirror, and the inclination of the reflection mirror may be varied by adjusting the height of the protrusion with a screw or the like. Further, as a material for finally fixing the position of the reflecting mirror 102, an adhesive epoxy resin other than the ultraviolet curable resin may be used.

  According to the light source device of the present embodiment, the following effects can be obtained. By dividing the array light source into two, the number of semiconductor laser elements that can be mounted can be increased as compared with the case where one array light source is used, and the output of the array light source can be increased. . In addition, since the heat source is dispersed by dividing the array light source, it is possible to reduce the size and space of the heat dissipation structure or the cooling structure attached to the array light source.

  Furthermore, even when the array light source includes semiconductor laser elements arranged two-dimensionally and the array light sources are arranged so as to face each other, the array mirrors 100 alternately intersecting in the column direction (Z direction) , 200 enables high-density mounting of the semiconductor laser elements without limiting the pitch interval in the row direction of the semiconductor laser elements, and further blocks the light emitted from the semiconductor laser elements by the array mirror itself. Alternatively, it is possible to provide a high-output light source device that is not shielded and is small in size and space-saving.

  Further, by adding a position adjustment function to each reflection mirror of the array mirror, the optical axis of each semiconductor laser element can be easily adjusted after mounting on the array light source. Thereby, a laser beam bundle accurately aligned from the light source device can be obtained.

  Next, a second embodiment of the present invention will be described. In the first embodiment, the laser light extracted from the array light source is in one direction (X direction). In the second embodiment, the laser light can be extracted from two directions (+ X direction, −X direction). It relates to a high-density array light source that can be used.

  FIG. 6 is a diagram illustrating a configuration of an array light source according to the second embodiment. The same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. In the second embodiment, unlike the first embodiment, the first array light source 30A is mounted with semiconductor laser elements arranged in 4 rows × n columns. Here, it should be noted that the pitch of the semiconductor laser elements in the column direction is Py / 2 without changing the size of the support member 32, and in fact, twice as many semiconductor laser elements are mounted. Similarly, the semiconductor laser elements arranged in 4 rows × n columns are mounted on the second array light source 40A. Accordingly, the first and second array light sources 30A and 40A can be array light sources having the same configuration, and the semiconductor laser elements of the first and second array light sources are the same as in the first embodiment. They are not nested or staggered in the row direction.

  FIG. 7 is a diagram for explaining reflection of laser light from the array light source according to the second embodiment. In the second embodiment, one array mirror 100A reflects light emitted from both the first array light source 30A and the second array light source 40A in different directions and is stacked on the one. The array mirror 200A reflects the light emitted from both the first array light source 30A and the second array light source 40A in different directions.

  FIG. 7A shows how the first row light of the first and second array light sources is reflected. The light in the first row of the first array light source 30A is reflected in the X direction by the array mirror 100A, and the light in the first row of the second array light source 40A is reflected in the −X direction by the array mirror 100A. The reflection mirror that constitutes the array mirror 100A includes reflectors on both sides, reflects light from the first array light source 30A in the X direction on the surface of one of the reflectors, and reflects the light from the first reflector on the back surface facing the one side. The light from the second array light source 40A is reflected in the −X direction. Also in the second embodiment, the reflecting mirror has a position adjusting function for freely adjusting the inclination of the reflecting surfaces of the reflectors on both sides in a three-dimensional direction. FIG. 7B shows a state in which the light in the second row of the first and second array light sources 30A and 40A is reflected. The light in the two directions extracted from the array light source can be used independently, or may be combined and used using an optical system.

  As described above, according to the second embodiment, the mounting density of the semiconductor laser elements is improved by halving the column-direction pitch of the semiconductor laser elements as compared with the first embodiment. A high-power laser array can be provided.

  In the first and second embodiments, the array light source on which the R, G, and B semiconductor laser elements are mounted is exemplified, but the arrangement of the R, G, and B semiconductor laser elements is arbitrary. . For example, when the first array light source includes semiconductor laser elements composed of three rows, the first row may be all R, the second row may be all G, the third row may be all B, or the first row R, G, B, R, G, B may be included in the second row, and R, G, B may be included in the third row. The number of R, G, and B semiconductor laser elements may be different. Furthermore, the arrangement of R, G, and B of the first array light source may be different from the arrangement of R, G, and B of the second array light source.

  Further, the first and second array light sources are not necessarily limited to those equipped with R, G, B semiconductor laser elements. For example, the first and second array light sources may be R only, G only, B only, or a combination of R and G, G and B, and R and G. If the first and second array light sources include only a semiconductor laser element that emits B (blue band) light, the blue band light output from the array light source is converted into a phosphor material, Wavelength conversion can be performed to light in the red band, the green band, and the yellow band.

  Next, an illumination optical system using the array light source of this embodiment will be described. FIG. 8 is a schematic side view of an illumination optical system according to the third embodiment of the present invention, and FIG. 9 is a schematic top view of FIG. The illumination optical system 300 according to the present embodiment includes the light source device 10 described in the first embodiment and various optical members arranged using the space on the light source device 10. As a result, the size of the illumination optical system 300 in the horizontal direction is reduced, and overall space saving is achieved.

  The laser light emitted from the light source device 10 is condensed by the condenser lens L1. The condenser lens L1 is preferably D-cut into a rectangular shape for miniaturization. For this reason, the shape of the spot of the laser beam that has passed through the condenser lens L1 is rectangular.

  The light that has passed through the condenser lens L1 is reflected at substantially right angles by the reflection mirror PM1. Further, the laser light is reflected substantially at a right angle by the reflection mirror PM2 disposed so as to face the reflection mirror PM1. Next, the laser light is condensed on the condensing lens L2 so as to have a light beam of a certain size, and then incident on one half of the condensing lens L3 as shown in FIG. The optical axis of the condensing lens L2 and the optical axis of the condensing lens L3 constitute a so-called shift optical system that is offset by a certain distance. The laser light condensed by the condenser lens L3 is condensed on the color wheel W by the condenser lens L4.

  When the R, G, and B semiconductor laser elements of the light source device 10 are driven simultaneously, the R, G, and B light from the light source device 10 are combined into white light. In this case, a color filter that reflects R, G, and B is formed on the surface of the color wheel W, and the laser light irradiated on the color wheel W is separated into R, G, and B by the color wheel W. The R, G, and B lights reflected by the color wheel W pass through the condensing lenses L4 and L3 of the shift optical system, and then the R and G lights are reflected at right angles by the dichroic mirror DF. The B light passes through the dichroic mirror DF and is reflected at right angles by the mirror BM that reflects the B wavelength. The R, G, and B lights reflected by the dichroic mirror DF and the mirror BM are sequentially collected by the condenser lens L5.

  For example, when the light source device 10 includes only a semiconductor laser element that emits light in a blue band (B), the color wheel W is irradiated with B light by a shift optical system. In this case, on the surface of the color wheel W, there is a reflective region that reflects B, a red phosphor region that develops red band light when irradiated with B, and a green phosphor region that develops green band light when irradiated with B. It is formed. FIG. 10 shows an example of the color wheel W. In the figure, 310 is an R reflection region, 320 is a red phosphor region, 330 is a green phosphor region, and P is an irradiation spot of laser light in a blue band.

  When the array light source includes R, G, and B semiconductor laser elements and the R, G, and B semiconductor laser elements are not turned on at the same time, and the R, G, and B semiconductor laser elements are turned on at different timings, Since the light of R, G, B is sequentially output from the light source device 10, the color wheel W is unnecessary.

  In the above-described embodiment, an example in which an optical component such as a lens of the illumination optical system is arranged using the space above the light source device 10 is shown. You may make it arrange | position in the space below the light source device 10, or the space on either side of the light source device 10. In this case, the layout of the illumination optical system can be easily changed by adjusting the reflection angles of the reflection mirrors PM1 and PM2 that reflect the laser light emitted from the light source device 10. When the illumination optical system is arranged using the left and right spaces of the light source device 10, the size of the illumination optical system in the height direction can be reduced.

  Next, a fourth embodiment of the present invention will be described. FIG. 11 shows an illumination optical system 300A according to the fourth embodiment of the present invention. The illumination optical system 300A of the present embodiment is configured using the light source device 10A of the second embodiment. As shown in FIG. 11A, the laser light emitted from one end of the light source device 10A (left side as viewed in the drawing) is turned back 180 degrees by an optical member 400 such as a reflecting mirror or a prism. Reflected. The reflected light enters the condenser lenses L10 and L12 together with the light emitted from the other end of the light source device 10A, and is used as synthesized light. When the light source device 10A includes R, G, and B semiconductor laser elements, the light emitted from the condenser lens L2 is white light.

  FIG. 11B shows another configuration example of the fourth embodiment. As shown in the figure, the light emitted from one end of the light source device 10A is emitted via the condenser lenses L20 and L22, and the light emitted from the other end is collected by the condenser lens L30, It is emitted via L32. For example, when the first array light source of the light source device 10A is composed of an R semiconductor laser element, the R laser light is emitted from the condenser lenses L20 and L22, and the second array light source is composed of a B semiconductor laser element. At this time, the laser beam B is emitted from the condenser lenses L30 and L32. Thus, it becomes possible to extract the light for each of the first and second array light sources.

  The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the specific embodiment, and various modifications can be made within the scope of the present invention described in the claims. Deformation / change is possible.

10: light source device 20: array light source 30: first array light source 32: support member 32A: bottom 34: condenser lens 40: second array light source 42: support member 42A: bottom 44: condenser lens 50: Drive circuit 60: control unit 100: array mirror 102: reflection mirror 104: coupling unit 200: array mirror 202: reflection mirror 204: coupling unit 300, 300A: illumination optical system

Claims (13)

An array light source including a semiconductor laser element that generates light in at least one of a blue band, a green band, and a red band,
A first array light source unit that includes a plurality of semiconductor laser elements arranged in a matrix direction and outputs light from each semiconductor laser element in a first direction;
A second array light source unit including a plurality of semiconductor laser elements arranged in a matrix direction and outputting light from each semiconductor laser element in a second direction opposite to the first direction;
An array mirror unit disposed between the first array light source unit and the second array light source unit and configured to reflect laser beams output from the first and second array light source units in a third direction; Have
The array mirror unit includes: a first array member in which a plurality of first reflection mirrors that reflect light in each row of the first array light source unit in a third direction are formed; and the second array light source unit. A second array member formed with a plurality of second reflection mirrors that reflect light in each row in a third direction;
An array light source, wherein the first array member and the second array member are stacked so as to intersect each other. The array light source according to claim 1, wherein a reflection surface of the first reflection mirror can be adjusted in a three-dimensional direction, and a reflection surface of the second reflection mirror can be adjusted in a three-dimensional direction. The array light source according to claim 1, wherein the first array member and the second array member have the same configuration, and the second array member is in a positional relationship obtained by inverting the first array member. . The first reflection mirror extends stepwise, the first reflection mirror corresponds to the row pitch of the semiconductor laser elements of the first array light source, and the second reflection mirror extends stepwise. 4. The array light source according to claim 1, wherein the second reflection mirror corresponds to a pitch in a row direction of the semiconductor laser elements of the second array light source. 5. The array light source according to claim 2, wherein the first and second reflection mirrors are coupled to a base portion by a magnetic force through a ball-shaped joint. The array light source according to claim 5, wherein the first and second reflecting mirrors are fixed to the base portion by a resin. 6. The array according to claim 1, wherein a position in a column direction of each row of the first array light source unit is alternately related to a position in a column direction of each row of the second array light source unit. light source. The array light source according to any one of claims 1 to 7, wherein a position of each row of the first array light source unit in the column direction is equal to a position of each row of the second array light source unit in the column direction. The first array member includes a reflection mirror that reflects light from the second array light source unit on the back surface of the first reflection mirror, and the second array member is disposed on the back surface of the second reflection mirror. The array light source of Claim 8 provided with the reflective mirror which reflects the light from one array light source part. The first array light source unit includes semiconductor laser elements of red band, green band, and blue band in one row, and the second array light source unit includes red band, green band, and blue band in one row. The array light source according to claim 1, wherein the semiconductor laser element is arranged. The first array light source unit includes semiconductor laser elements of red band, green band, and blue band for each row, and the second array light source unit includes red band, green band, and blue band for each row. The array light source according to claim 1, wherein the semiconductor laser element is arranged. An illumination optical system including an optical member that performs illumination using light from the array light source according to any one of claims 1 to 11. The optical member includes a reflecting member that turns back the light emitted from the array light source in the opposite direction, and at least a part of the optical member of the illumination optical system is disposed in the upper and lower or left and right side spaces of the array light source. 12. The illumination optical system according to 12.

Images