JP6463111B2 - Laser light source device and video display device - Google Patents

Description

  The present invention relates to a compact and inexpensive high-power laser light source device that spatially synthesizes laser light emitted from a plurality of laser light sources, and an image display device including the laser light source device.

  In recent years, there has been a demand for higher brightness of projector devices for applications such as digital cinema, large conference rooms, and outdoor video projection mapping. The introduction of laser projectors equipped with laser light source devices has already begun in digital cinema, and expectations for high-intensity laser light sources are high. In general, since there is a limit to increasing the output of a single laser module, in such a high-intensity laser projector, laser beams (laser beams) from a plurality of laser modules are efficiently combined to produce a laser light source device. The light output is increased.

  As a specific example for increasing the luminous flux density by combining laser beams from a plurality of laser modules and suppressing the etendue of the optical system to increase the brightness of the light source device, a step-like mirror means is used. There has been proposed a method of converting to a beam interval smaller than the beam emission axis interval of a plurality of laser modules (see, for example, Patent Documents 1 and 2).

  However, when the mirror means arranged in a step shape is used, the mirror means that is farther from the laser module has a higher sensitivity for performance variation due to the shape of the part and the accuracy of the arrangement, and therefore the relative relationship between the laser module and the mirror means. The holding structure that determines the position is required to have high accuracy. Furthermore, a prism mirror with high dimensional accuracy is required for the mirror means, a step for adjusting the position of each mirror means or a high-precision mirror means adjustment function is required, and an inexpensive laser light source device is configured. It becomes difficult. Since such a tendency becomes more prominent as the number of laser modules increases, there is a problem that the step-like mirror means is not appropriate when further increasing the output of the laser light source device. Therefore, as a method for increasing the light beam density without using the step-like mirror means, there has been proposed a method in which a parallel plate made of a transparent material is arranged obliquely with respect to the collimated light beam (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 61-208023 Japanese Patent Laid-Open No. 2-60179 Japanese Patent No. 4739819

  In the method described in Patent Document 3, the light flux density after passing through the parallel plate can be increased by the thickness of the parallel plate and the arrangement angle thereof, and further by the refractive index of the transparent material. However, if the size of each laser module is large and, for example, the interval between the laser beam emission axes before synthesis is required to be about 50 mm, even a parallel plate with a high refractive index requires several tens of mm or more. For this reason, since the weight and volume of the parallel plate and the structure holding the parallel plate increase, it is difficult to construct an inexpensive and small light source device.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a small and inexpensive laser light source device and video display device capable of efficiently condensing laser beams from a plurality of laser light sources to achieve high output.

The present invention engaging Relais chromatography The light source device includes a multi-emitter laser light source having a plurality of emitters and cross section for emitting a laser beam of elliptical in a first direction, the laser beam emitted from the multi-emitter laser light source A first lens unit that collimates the laser beam in the Fast axis direction and converges the laser beam in the Slow axis direction, and a beam waist generated by the convergence of the laser beam in the Slow axis direction by the first lens unit. A second lens unit that changes the direction of the laser beam that has passed through the first lens unit, and a mirror that reflects the laser beam whose direction has been changed by the second lens unit in a second direction A plurality of laser light source units, and the plurality of laser light source units are arranged on the same plane and reflect laser light reflected in the second direction. Adjacent laser light source units are arranged in series so that the directions of the major axes of the ellipse formed by the surfaces coincide with each other, and each of the mirror portions has a cross section of the laser light reflected in the second direction. The angle of rotation of the laser light emitted from each laser light source with respect to the optical axis can be set such that the direction of the major axis of the ellipse formed by and the second direction form a predetermined angle. is there.

  An image display device according to the present invention illuminates a laser light source device, a uniformizing unit that uniformizes an intensity distribution of laser light emitted from the laser light source device, and the laser light uniformized by the uniformizing unit. An illumination optical system that irradiates as light, a video display element that spatially modulates the illumination light according to a video signal input from the outside, and a projection that projects the illumination light spatially modulated by the video display element onto a screen And an optical system.

According to engagement Relais chromatography The light source device of the present invention, a plurality of laser light source units are arranged in series, for reflecting the laser beam in the same direction by the mirror portion, while keeping parallel to the optical axis of each other etendue It is possible to perform spatial synthesis of laser light while suppressing an increase in the laser beam. Further, since the mirror section can set the rotation angle with respect to the optical axis of the laser light emitted from the multi-emitter laser light source, the laser light reflected in the second direction is adjacent to the traveling direction side of the laser light source The rotation angle can be determined so as not to interfere with the mirror part of the unit, and a laser light source device with little optical loss can be configured.

  Further, the plurality of laser light source units arranged in series are arranged so that the directions of the major axes of the ellipses that the cross section of the laser beam exhibits coincide. For this reason, according to the action of the mirror section, the laser beams from a plurality of multi-emitter laser light sources are rearranged so as to be arranged close to each other in the direction of the minor axis of the ellipse by setting a small rotation angle of several degrees or less. And high density spatial synthesis can be realized.

  In addition, the laser beam direction can be changed by simply adding two lenses, and the laser beam emitted from each laser light source unit can be collimated. Thus, it is possible to make the cover parts covering them compact, and to provide an inexpensive and small laser light source device, and also an inexpensive and small image display device equipped with the laser light source device.

1 is a schematic diagram illustrating a configuration of a laser light source device according to Embodiment 1. FIG. It is the schematic which shows the structure of a laser light source. It is the schematic which shows the relationship between arrangement | positioning of a mirror, and a laser beam emission direction. It is the schematic which shows typically the position and rotation condition of a laser array light beam. It is the schematic which shows the example which arranged two laser light sources in parallel along the optical axis Xs. It is the schematic which shows the image which carried out cross-sectional observation of the synthetic light beam by the several laser array light beam rearranged in the plane perpendicular | vertical to an optical axis. It is the schematic which shows the light beam apparatus which arrange | positioned the laser light source continuously, and was stored in the housing | casing. It is the schematic which shows the laser light source device of the state which deflected the laser array light beam by the transparent glass material. It is the schematic which shows a mirror holder. It is the schematic which looked at the laser light source from the opposite side to the emission side of a laser beam. FIG. 6 is a schematic diagram illustrating a configuration of a laser light source device according to a second embodiment. It is the schematic which shows a mode that the laser beam from a semiconductor laser array is collimated and converged. It is the schematic which shows a mode that a laser beam is collimated with a collimator lens array. It is the schematic which shows a mode that a spherical lens is added and a laser beam is made parallel. FIG. 6 is a schematic diagram showing that a parallel beam bundle can be maintained over a longer distance by adding more spherical lenses. It is the schematic which shows the behavior of the laser beam at the time of arrange | positioning a cylindrical lens. It is the schematic of the sealing structure by the cap sealing which uses a spherical lens as an output window. It is the schematic of the sealing structure by the cap sealing which uses a cylindrical lens as an output window. FIG. 6 is a schematic diagram illustrating a configuration of a video light source device according to Embodiment 3. It is the schematic which shows distribution of the laser array light beam of a laser light source apparatus.

<Embodiment 1>
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration of a laser light source device 1 according to the first embodiment.

  As shown in FIG. 1, the laser light source device 1 includes laser light source units 61, 62, 63, 64 and a base plate 3. The laser light source units 61, 62, 63, and 64 include laser light sources 11, 12, 13, and 14 and mirrors 21, 22, 23, and 24 corresponding to the laser light sources 11, 12, 13, and 14 (mirror portions). ) And a mirror holder (holder part) which will be described later (not shown in FIG. 1). The base plate 3 is a member for arranging the laser light sources 11, 12, 13, and 14 in series on the same plane. The mirrors 21, 22, 23, and 24 are held by mirror holders, respectively.

  The laser light sources 11, 12, 13, and 14 are, for example, semiconductor lasers, and emit laser light in the first direction. Since the emitted laser light has different divergence characteristics in two orthogonal directions, the cross section of the laser light is elliptical (in FIG. 1, the emission window of the laser light source schematically shows an elliptical shape). The laser light sources 11, 12, 13, and 14 are arranged on the base plate 3 so that the major axis of the ellipse is aligned along the reference line L. The mirrors 21, 22, 23, and 24 are disposed on the optical axes of the laser light sources 11, 12, 13, and 14, and the reflecting surfaces of the mirrors 21, 22, 23, and 24 are inclined surfaces having an inclination angle of 45 degrees with respect to the base plate 3. The laser light emitted perpendicularly to the base plate 3 is bent (reflected) in the second direction so as to be parallel to the base plate 3. Each mirror 21, 22, 23, 24 is configured such that the rotation angle with respect to the optical axis of the laser light source 11, 12, 13, 14 can be set, so that the traveling direction of the laser light can be arbitrarily set.

  The image of the laser beam on the reflection surfaces of the mirrors 21, 22, 23, and 24 is elliptical. The long axis direction and the slope of the elliptical image (the reflection surfaces of the mirrors 21, 22, 23, and 24) are the maximum. The rotation angles of the mirrors 21, 22, 23, and 24 with respect to the optical axes of the laser light sources 11, 12, 13, and 14 are set so that the angle formed with the direction of the inclined line (second direction) is a predetermined angle. The Further, as shown in FIG. 1, the intersections of the optical axes of the laser light sources 11, 12, 13, and 14 and the mirrors 21, 22, 23, and 24 are close to the ends of the mirrors 21, 22, 23, and 24. The entire mirrors 21, 22, 23, and 24 are biased.

  According to the setting of the rotation angles and the mirror positions of the mirrors 21, 22, 23, and 24, for example, the laser light source unit that is adjacent to the laser light source 12 bent by the mirror 22 on the laser light traveling direction side. It can be made to travel past the vicinity (side) of 61 mirrors 21. Similarly, the laser light from the laser light source 13 of the laser light source unit 63 can also travel past the vicinity (side) of the mirror 22 of the adjacent laser light source unit 62 according to the setting of the corresponding mirror 23. If the setting of the mirror 24 and the setting of the mirror 21 are the same, the laser beams bent by the respective mirrors can be set so as to be substantially parallel to each other. For this reason, as shown in FIG. 1, laser beams having an elliptical cross section from the laser light sources 11, 12, 13, 14 of the plurality of laser light source units 61, 62, 63, 64 arranged adjacent to each other, It can be rearranged close to the direction of the minor axis of the ellipse.

The laser light sources 11, 12, 13, and 14 may be a single-emitter type semiconductor laser or a multi-emitter type semiconductor laser array having a plurality of emitters. For example, a light source having an emitter size of 120 μm, an emitter interval of 700 μm, and a number of emitters of 6 emitters arranged at substantially equal intervals in the array width direction of 3.5 mm. The divergence angle of the laser array light beam emitted from the semiconductor laser array is greatly different in the array width direction (Slow axis, Xs) and the direction perpendicular thereto (Fast axis, Xf), and the latter is larger than the former. Has a divergence angle. Regarding the Fast axis direction, for example, a cylindrical lens is arranged immediately after the emitter to collimate the light spreading from the semiconductor laser array, and the light can be used efficiently by suppressing the divergence angle. The focal length of the cylindrical lens is about 1.2 mm. The divergence angle of the laser array light beam is defined by the angle (full angle) in the direction in which the light intensity is 1 / e ² with respect to the direction in which the light intensity is maximum.

  Due to the action of the cylindrical lens, the divergence angle of the laser array light beam emitted from the laser light sources 11, 12, 13, and 14 is about 1 degree in the Fast axis direction and about 5 degrees in the Slow axis direction, and is large in two directions orthogonal to each other. Has different divergence characteristics. As described above, regardless of whether the laser light source is a single emitter or a multi-emitter type combined with a cylindrical lens, as long as the laser light source has an elliptical cross section, the laser light source device 1 functions effectively. A desired effect can be obtained. Note that the number of laser light sources, the size of the emitter, the emitter interval, the number of emitters, or the focal length of the cylindrical lens is not limited to the above values.

  Next, the configuration of the laser light source 11 composed of a semiconductor laser array will be described. FIG. 2 is a schematic diagram showing the configuration of the laser light source 11. The semiconductor laser array and the cylindrical lens are housed in a cap 111 attached on the stem 110. The collimated laser array light beam is emitted through the window glass 112 in a substantially normal direction of the plane (upper surface) of the stem 110. Let this optical axis be Xa. The stem 110 is a substantially rectangular plate-like component, and the semiconductor laser array is arranged so that the Fast axis and the Slow axis are substantially parallel to the vertical and horizontal ridge lines of the stem 110. Also in FIG. 2, as in the case of FIG. 1, an elongated cross section of the laser array light beam is schematically shown as an ellipse.

  The stem 110 is a plate-like component having prescribed parallelism and flatness, and serves as a reference for determining the direction and position of the laser array light beam emitted from the laser light source 11. Therefore, a plurality of laser light sources can be accurately arranged on the base plate 3 via the stem. The cap 111 is a metal part having a window glass 112 from which a laser array light beam is emitted on the top surface, and is joined to the stem 110 by, for example, soldering or brazing to form a sealing structure. As described above, since the main components such as the semiconductor laser array are provided in the sealed internal space, handling as the laser light source 11 is easy, and extremely high environmental resistance can be maintained.

  Next, the relationship between the arrangement of the mirror 21 and the laser beam emission direction will be described with reference to FIG. FIG. 3 is a schematic diagram showing the relationship between the arrangement of the mirror 21 and the laser beam emission direction. The configuration of the mirrors 22, 23, and 24 is the same as the configuration of the mirror 21, and thus the description thereof is omitted. In order to bend the laser array light beam emitted from the laser light source 11 by 90 degrees, the mirror 21 is disposed at an angle of 45 degrees with respect to the optical axis Xa in FIG. 2, and the laser array light beam reflected by the mirror 21 is the stem. It is bent so as to be substantially parallel to the upper surface of 110. The mirror 21 is rotated by an angle θ with respect to the optical axis Xa, and the optical axis Xl1 of the laser array light beam after being reflected by the mirror 21 is inclined by the angle θ with respect to the optical axis Xs. That is, the angle θ formed by the optical axis Xl and the optical axis Xs can be adjusted by the rotation angle of the mirror 21 with respect to the optical axis Xa.

  FIG. 4 is a schematic diagram schematically showing the position and rotation of the laser array light beam. When the mirror 21 is rotated with respect to the optical axis Xa, and when it is rotated with a different rotation axis. It is a figure for demonstrating the difference in the locus | trajectory of a laser array light beam. The laser array light beam emitted from the laser light source 11 can be schematically represented by an elongated elliptical cross section as described above. However, the laser array light beam becomes a further elongated image on the mirror 21 arranged at an angle of 45 degrees and covers this. The effective area 25 of the mirror 21 is a long and narrow rectangle as shown by the hatched portion.

  When the effective area 25 is rotated with respect to the optical axis Xa, the image of the laser array light beam draws a locus Ta on the observation plane parallel to the optical axis Xa provided at a position away from the laser light source 11 by a predetermined distance. Become. That is, when the rotation angle with respect to the optical axis Xa increases, the image of the laser array light beam changes its position while rotating itself without changing its height in the optical axis Xa direction. In this case, it is clear that the height of the locus Ta does not change even if the observation surface is further away from the laser light source 11.

  On the other hand, when the effective area 25 is rotated with respect to the axis Xm in the long side direction, the image of the laser array light beam draws a trajectory Tm like a parabola and rapidly changes its height. If the rotation axis of the mirror 21 is sufficiently small, the difference between the two can be ignored. However, if the distance between the laser light source 11 and the observation surface is increased, the influence of a significant change in the position of the image cannot be ignored. Assuming a continuous arrangement of the laser light sources 11, 12, 13, and 14 as shown in FIG. 1, when the mirror 21 is rotated with respect to the optical axis Xa, the spatial synthesis of a plurality of laser array light beams is well organized. The influence on the height direction of the laser light source device 1 is small.

  FIG. 5 is a schematic diagram showing an example in which two laser light sources 11 and 12 having the mirror arrangement described above are arranged in parallel along the optical axis Xs. The laser array light beam emitted from the laser light source 11 is bent by the mirror 21 to become the optical axis Xl 1, and passes near (side) the mirror 22 provided in the adjacent laser light source 12. The laser array light beam emitted from the laser light source 12 is bent by the mirror 22 to become the optical axis Xl2. The optical axis Xl1 and the optical axis Xl2 are substantially parallel, and the angle formed by the optical axis Xl1 and the optical axis Xl2 is desirably 1 degree or less. Further, it is desirable to select an angle θ at which the mirror 21 is rotated aiming at the last minute that the laser array light beam traveling along the optical axis X11 does not interfere with the mirror 22. By doing so, it is possible to rearrange the laser array light fluxes of the plurality of laser light sources 11 and 12 that are inevitably arranged at positions separated by the side length of the stem 110 in a spatially high density. Thereby, the synthetic | combination light beam with small etendue and excellent in condensing property can be made.

  For example, the mirror 21 is arranged at a height of 20 mm from a plurality of emitters, the divergence angle along the Fast axis is about 1 degree in all angles, the side length along the optical axis Xs of the stem 110 is 40 mm, and the array of emitters If the width in the direction perpendicular to the width is 1 mm, the width of the laser array light flux in the mirror 21 in the optical axis Xf direction is about 1.7 mm. The rotation angle θ of the mirror 21 with respect to the optical axis Xa is such that the laser array light flux from the adjacent laser light source 12 that is 40 mm away from the vicinity of the mirror 21 whose effective dimension is determined with a predetermined margin is maintained at a predetermined interval. It can be determined from the conditions for passing. In the case of the above parameters, by setting the rotation angle θ of the mirror 21 with respect to the optical axis Xa to about 3.5 degrees, the size margin of the mirror 21 is about 0.5 mm, and the distance between the mirror 21 and the laser array light beam is about 1 mm. Can be set to However, the arrangement height of the mirror 21, the divergence angle along the Fast axis, the length of the side along the optical axis Xs of the stem 110, the width in the direction perpendicular to the array width of the emitter, the dimension margin of the mirror 21, and the mirror 21 And the laser array light flux are not limited to the above values.

  FIG. 6 is a schematic diagram showing an image obtained by observing a cross section of a combined light beam by a plurality of rearranged laser array light beams on a plane perpendicular to the optical axis. Here, four laser light sources 11, 12, 13, and 14 are continuously arranged as shown in FIG. 1, and a laser array is formed by mirrors 21, 22, 23, and 24 corresponding to the laser light sources 11, 12, 13, and 14, respectively. The luminous flux was rearranged at approximately equal intervals. At this time, the major axis directions of the images of the laser array light beams reflected by the mirrors 21, 22, 23, and 24 are aligned in the same direction. An image of the laser array light beam is schematically represented by an elongated ellipse, and the long axis of the laser array light beam image is Xs 'and the short axis is Xf'.

  As described with reference to FIG. 4, the entire image of the laser array light beam is rotated by an angle θ due to the rotating action of the mirror. Assuming that the rotation angle of the mirror disposed at a height of 20 mm from the light emitting point in the figure is 3.5 degrees and the interval between the adjacent laser light sources is 40 mm, the interval between the adjacent laser array light beams is about 2.4 mm. The major axis (major axis) of the image of the laser array beam from the laser light source 14 having the longest optical path length is about 35 mm, and the major axis (major axis) of the image of the laser array beam from the laser light source 11 arranged closest is about 19 mm. Assuming a rectangle surrounding the image of the four light beams, the size is about 23 mm × about 35 mm. Therefore, compared with the state of the basic configuration of the laser light source device 1 in which the four laser light sources 11, 12, 13, and 14 are continuously arranged at a pitch of 40 mm, a much larger luminous flux density can be obtained and an increase in etendue is suppressed. be able to.

  It is well known that semiconductor lasers cause reliability problems such as unstable operation or failure when the emitted light recurs for some reason. FIG. 7 is a schematic diagram showing the light beam device 10 in which the laser light sources 11, 12, and 13 are continuously arranged and housed in a housing 50.

  The casing 50 is formed in a box shape, and a window glass 40 is provided at a position where the laser array light beam passes in the casing 50. According to the above method, the optical axis Xl of the plurality of laser array light beams is inclined by the angle θ with respect to the optical axis Xs, and when a parallel plate perpendicular to the optical axis Xs is arranged as the window glass 40, the reflected light is shown in FIG. As indicated by the dotted arrow 7, the laser light sources 11, 12, and 13 do not return. Usually, the window glass 40 is provided with an antireflection coating that maximizes the transmittance, and the reflected light generated here is extremely weak. However, even if the return light is weak, the operation of the semiconductor laser may become unstable and malfunction may occur. Therefore, the configuration of the laser light source device 1 is excellent in terms of reliability. Note that a part of the laser array light beam reflected by the window glass 40 can easily prevent secondary problems due to internal reflection or the like by providing a light absorbing means or the like at a predetermined position in the housing 50. .

  However, a laser light source device that emits a laser array light beam tilted with respect to the optical axis Xs may be inconvenient when a plurality of the laser light source devices are arranged to constitute a high-output light source device. Such inconvenience can be easily eliminated by simply placing a wedge-shaped transparent glass material 40a in a cross-sectional view in the optical path, as shown in FIG. FIG. 8 is a schematic view showing the laser light source device 1 in a state where the laser array light beam is deflected by the transparent glass material 40a.

  The optical axis Xl of the laser array light beam tilted with respect to the optical axis Xs can be corrected by the wedge-shaped transparent glass material 40a in cross-sectional view, and the optical axis Xs and the optical axis Xl can be made substantially parallel. . Since the optical axis of the laser array light beam can be made parallel to the optical axis Xs, that is, the optical axis Xl of the laser light source device 1 from any direction, the optical axis Xl is inclined when the laser light source device 1 is mounted. Various inconveniences caused by the problem can be solved. The wedge-shaped apex angle θ ′ for correcting the angle θ to zero the inclination of the optical axis Xl of the laser array light beam emitted from the laser light source device 1 is, for example, when the refractive index of the transparent glass material 40a is 1.5. About 7 degrees.

  In the case where the laser light source device 1 is provided with an outer casing, the transparent glass material 40a may be used as a laser array light beam emission window. Further, by arranging so that both the front and back surfaces of the transparent glass material 40a are not perpendicular to the optical axis Xl of the laser array light beam, the reflected light from either surface of the transparent glass material 40a is also a laser light source. It is possible not to return directly to 11, 12, and 13, and to avoid the problems of the semiconductor laser caused by the return light.

  Next, the mirror holder 31 will be described with reference to FIG. FIG. 9 is a schematic view showing the mirror holder 31. The mirror holder 31 is disposed on the stem 110 to hold the mirror 21. The laser light source device 1 includes a mirror holder 31 that holds the mirrors 22, 23, and 24 shown in FIG. 1 in addition to the mirror holder 31 that holds the mirror 21. The mirror holder 31 will be described.

  The mirror holder 31 includes a pair of foot portions 31a and a body portion 31b. The mirror holder 31 is fixed to the upper surface of the stem 110 by feet 31a. The body part 31b is disposed on the upper side of the cap 111, and the pair of foot parts 31a are provided so as to extend in a direction parallel to the stem 110 from the lower end part of the body part 31b. Further, the pair of feet 31 a has a positioning structure for the stem 110.

  The body part 31b has a reference surface for setting the optical surface (reflective surface) of the mirror 21 to an inclination of 45 degrees, and a part of the mirror 21 is supported from the back by a pressing means (not shown) and can be fixed. it can. The mirror 21 is desirably a surface mirror, and in the case of being a surface mirror, variation in thickness and distortion of the substrate can be almost ignored, and the accuracy of bending light can be increased by arranging a stable reflecting surface. .

  Moreover, since it is not necessary to care about the transmittance | permeability etc. of a base material, it is easy to divert a mirror component currently distributed in large quantities and to comprise at low cost. Further, the mirror 21 is arranged so that the effective area 25 of the mirror 21 indicated by the hatched portion in FIG. 9 protrudes from the reference plane of the mirror holder 31 and is located above the window glass 112. The effective area 25 of the mirror 21 in consideration of the dimension margin is a rectangle of about 9 mm × 3 mm. It is desirable that the side of the mirror 21 on the side where the laser array light beam passes in the vicinity is made by cutting the mirror 21 so as to be an effective area up to the outermost edge. Note that the amount by which the effective area protrudes from the reference surface of the mirror holder can be strictly adjusted for each mirror holder, and can flexibly cope with variations in individual laser light sources.

  The body portion 31b has a shape that does not interfere with the laser light emitted from the window glass 112, but the foot portion 31a reaches the position where the cap 111 can be sandwiched to secure the installation area. The tip of is stretched. Since a sufficient ground contact area of the mirror holder 31 with respect to the stem 110 can be ensured, the assembly stability of the mirror holder 31 with respect to the stem 110 can be improved. As a pressing means for the mirror 21, a method of pressing with a spring pressure from the back surface of the mirror 21 by using a spring means made of a thin metal plate is generally used. However, even when an adhesive is used as an auxiliary, the laser light source 11 has a cap 111. It is possible to prevent the gas generated from the adhesive from entering the cap 111 and contaminating the components arranged in the cap 111.

  In order to facilitate the handling and assembly of the mirror 21 and to improve the positional accuracy and holding stability of the optical surface of the mirror 21, the mounting surface of the mirror 21 brought into contact with the reference surface of the mirror holder 31 is effectively indicated by hatching. It is desirable to secure an area that is about two to three times the area 25 or more. According to such a mirror shape, not only the handling of the mirror 21 itself is facilitated and the workability of the assembly is improved, but also, for example, an adhesive is applied at a position away from the effective area 25 to strengthen the mirror fixing. At the same time, there is an advantage that the possibility of soiling the mirror 21 during the operation can be reduced, and the yield of the assembly process of the mirror holder 31 can be increased. The mirror holder 31 is preferably made of a metal material that is highly workable and resistant to deformation, but a resin material having high creep resistance and high heat resistance may be used. In the case of metallic materials, the same shape is made at low cost by die-casting, etc., and secondary processing is applied to parts that require shape accuracy to improve flatness or parallelism, or positioning reference holes or reference pins are provided. Or you may.

  Thus, according to the mirror holder method, not only is it easy to improve the accuracy of the mirror holder alone, but also the relative positional accuracy of the adjacent mirror holders can be improved by assembling with the base plate 3 as a reference. It becomes easy. In addition, even if there is a malfunction during production or malfunction during use, it can be replaced and repaired in units of mirror holders, flexibly responding to malfunctions in the assembly process, and further improving serviceability as a product To contribute.

  As shown in FIG. 6, the laser array light beams from the laser light sources 11, 12, 13, and 14 are arranged in parallel with each other, and thus have high affinity with a liquid crystal display device using polarized light. Since the mirror holder has a positioning structure on the foot, it can be rotated relative to the stem to finely adjust the rotation angle of the mirror. Therefore, the contrast performance of the liquid crystal display device can be improved by improving the degree of polarization. It is possible to improve.

  In the above description, the configuration in which the adjacent laser light sources are arranged in a straight line has been described. However, this is not only advantageous from the viewpoint of the space factor of the laser light source device 1, but is also preferable from the viewpoint of cooling the laser light source. FIG. 10 is a schematic view of the laser light sources 11 and 12 as viewed from the side opposite to the laser light emission side.

  As shown in FIG. 10, each of the four small circles arranged on the right side of the Xs axis indicates two sets of anode pins and cathode pins. The laser light sources 11 and 12 are configured such that a laser chip is disposed here with the intersection of the optical axis Xs, the optical axis Xf1, and the optical axis Xf2 as the origin. Specifically, since a thin plate-like laser chip is mounted on the side surface of a block (not shown) mounted on the stems 110 and 120, the bottom surface of the block is from the optical axis Xs as shown by the hatched portion in FIG. It becomes a biased position. Since the heat of the laser chip is exhausted through this block, the shaded portions become the cooled surfaces 51 and 52 of the laser light sources 11 and 12, respectively. The cooled surface 51 of the laser light source 11 and the cooled surface 52 of the laser light source 12 are arranged in a straight line, which is advantageous in designing a structure for cooling while avoiding the anode pin and the cathode pin. .

  In the above description, a case has been described in which the mirror rotation angles are all the same, and a plurality of laser array beams are spatially combined while maintaining parallel to each other. For example, the mirror rotation angle is adjusted little by little. The laser array beams can be combined so as to be converging as a whole instead of being identical to each other. As described above, if the allowable value of the etendue of the combined light beam is not exceeded, it is possible to cope with fine adjustment of the light beam density only by adjusting the rotation angle of the mirror.

  In the above description, the case where the laser array beam has anisotropy of the divergence angle that greatly expands in one direction has been described. However, the present invention is not limited to this, and the design of the cylindrical lens is different. Even when the anisotropy can be reduced by adding an optical element, the same effect of improving the light flux density can be obtained.

  As described above, in the laser light source device 1 according to the first embodiment, the plurality of laser light source units 61, 62, 63, 64 are arranged in series, and the mirror 21 is arranged on the optical axis of each laser beam. , 22, 23, and 24 reflect each laser beam in the same direction, it is possible to perform spatial synthesis of laser beams while keeping the optical axes parallel to each other and suppressing an increase in etendue. Moreover, since the mirrors 21, 22, 23, and 24 can set the rotation angle with respect to the optical axis of the laser beam emitted from the laser light source, the laser beam reflected in the second direction is on the traveling direction side. The rotation angle can be determined so as not to interfere with the mirror of the adjacent laser light source unit, and the laser light source device 1 with less light loss can be configured.

  Further, the plurality of laser light source units 61, 62, 63, and 64 arranged in series are arranged so that the directions of the major axes of the ellipse formed by the cross section of the laser light coincide. Therefore, according to the operation of the mirrors 21, 22, 23, and 24, the laser beams from a plurality of laser light sources are arranged close to each other in the direction of the elliptical short axis by setting a small rotation angle of several degrees or less. Can be rearranged as described above, and high-density spatial synthesis can be realized.

  The plurality of laser light source units 61, 62, 63, and 64 are arranged on the same plane, and the same kind of mirror is held by the same kind of mirror holder in each laser light source unit 61, 62, 63, and 64, respectively. Therefore, it is possible to provide an inexpensive and small-sized laser light source device 1 that suppresses the types of components and is excellent in assemblability.

  In addition, since the plurality of laser light sources 11, 12, 13, and 14 are continuously arranged on the same plane in the base plate 3, it is easy to align these surfaces to be cooled on the same plane, thereby improving the cooling performance. High output can be achieved. Further, in this case, since the laser light source device 1 that is elongated in the direction of the emission axis of the laser array light beam can be configured, the size can be reduced even when a plurality of laser light source devices 1 are stacked.

  Moreover, since the laser light source device 1 can be reduced in size, the packaging can be reduced in size and the ease of transportation is improved. Further, since it can be efficiently condensed by combining with a laser beam having a high spatial density, it is possible to reduce energy consumption.

  Each mirror 21, 22, 23, 24 is a laser array emitted from each laser light source 11, 12, 13, 14 so as to be able to reflect the laser array light flux so as to pass the side of the mirror of the adjacent laser light source unit. A rotation angle with respect to the optical axis of the light beam is set, and the optical axes of the laser array light beams reflected by the mirrors 21, 22, 23, and 24 are substantially parallel to each other.

  Therefore, it is possible to rearrange the laser array light fluxes of the plurality of laser light sources 11, 12, 13, and 14 that have to be arranged at positions separated by the side length of the stem 110 with high spatial density. Thereby, the synthetic | combination light beam with small etendue and excellent in condensing property can be made.

<Embodiment 2>
Next, the laser light source device 20 according to Embodiment 2 will be described. FIG. 11 is a schematic diagram showing the configuration of the laser light source device 20 according to the second embodiment. In the second embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 11, the laser light source device 20 includes laser light source units 71, 72, 73 and 74 and a base plate 30. The laser light source units 71, 72, 73, 74 include block materials 105, 106, 107, 108, semiconductor laser arrays 15, 16, 17, 18 (multi-emitter laser light sources), collimator lens arrays 115, 116, 117, 118 (first lens portion), spherical lenses 45, 46, 47, and 48 (second lens portion), and mirrors 21, 22, 23, and 24 (mirror portions), respectively.

  The block materials 105, 106, 107 and 108 are arranged in series on the base plate 30, and the semiconductor laser arrays 15, 16, 17 and 18 are arranged on the side surfaces of the block materials 105, 106, 107 and 108. The semiconductor laser arrays 15, 16, 17 and 18 have multi-emitters composed of a plurality of emitters. The collimator lens arrays 115, 116, 117, and 118 are provided corresponding to the multi-emitters of the semiconductor laser arrays 15, 16, 17, and 18. The spherical lenses 45, 46, 47, 48 are arranged on the optical axes of the respective laser light source units, and mirrors 21, 22, 23, 24 are arranged after the spherical lenses 45, 46, 47, 48. Yes. It is assumed that the spherical lenses 45, 46, 47, and 48 and the mirrors 21, 22, 23, and 24 are held by respective holder portions (not shown).

  The semiconductor laser arrays 15, 16, 17, and 18 have a plurality of emitters configured in an array, and laser light is emitted from the emission end face in a first direction perpendicular to the base plate 30. Since the emitted laser light has different divergence characteristics in two orthogonal directions, the cross section of the laser light has an elliptical shape (schematically shown as an elliptical shape in FIG. 11). The block materials 105, 106, 107, 108 for arranging the semiconductor laser arrays 15, 16, 17, 18 on the side surfaces are arranged on the common base plate 30 so that all the emitters are aligned.

  The mirrors 21, 22, 23, and 24 are rotated at an angle of 45 degrees with respect to the base plate 30, and the laser light emitted in the first direction is parallel to the base plate 30. Bend (reflect) in the second direction. These mirrors 21, 22, 23, and 24 have the same operations and actions as the mirrors 21, 22, 23, and 24 described in the first embodiment, and are therefore given the same reference numerals.

  Therefore, the mirrors 21, 22, 23, and 24 can arbitrarily set the rotation angle with respect to the optical axis of the semiconductor laser arrays 15, 16, 17, and 18. For example, the laser light that is bent by the mirror 22 advances the laser light. It can be set so that the side of the mirror 21 of the laser light source unit 71 adjacent to the direction side passes close without being interfered. If all the mirrors are set in the same manner, the laser beams bent by the respective mirrors can be arranged close to each other in the minor axis direction of the ellipse as shown by the ellipse in FIG.

  By collimating or converging the laser light emitted from the semiconductor laser array with a lens, the diameter of the laser beam can be kept substantially constant over a predetermined distance. As shown in FIG. 12, the semiconductor laser array 15 includes three emitters having an emitter size of 100 μm and an emitter interval of 300 μm, for example. FIG. 12 is a schematic diagram showing how the laser light from the semiconductor laser array 15 is collimated and converged. Since the laser light source units 71, 72, 73, and 74 have the same configuration, only the parallelization and convergence of the laser light in the laser light source unit 71 will be described below.

  The divergence angle of the emitted laser light is greatly different between the array width direction (Slow axis, Xs) and the direction perpendicular thereto (Fast axis, Xf), and the latter has an extremely larger divergence angle than the former. With respect to the Fast axis direction, first, the collimator lens array 115 is disposed immediately after the emitter of the semiconductor laser array 15, whereby the laser light can be made substantially parallel. On the other hand, due to the action of the collimator lens array 115, the laser beam in the Slow axis direction incident on the collimator lens array 115 with a small divergence angle forms an image behind the collimator lens array 115, and a beam waist (hereinafter referred to as “image position”). "). A spherical lens 45 is disposed on the beam waist. The spherical lens 45 exhibits the same action in any direction, while the incident laser light has anisotropy of the divergence angle.

  FIG. 13 is a schematic diagram showing a state in which laser light is collimated by the collimator lens array 115, and FIG. 13A shows a case of laser light in the Fast axis direction having a large divergence angle, and FIG. ) Is the case of laser light in the slow axis direction. As shown in FIG. 13A, the incident surface of the collimator lens array 115 is formed in a flat shape, and the exit surface of each lens unit is formed in a spherical shape. In the collimator lens array 115, the collimator lens array The main design parameters are the physical characteristics such as the refractive index and dispersion of 115 materials, the lens thickness, and the curvature of the exit surface. Since the width of the emitter that emits the laser beam is only about 1 μm at most, a lens having a focal length of about 1 mm can parallelize the laser beam with sufficiently high parallelism.

  On the other hand, as shown in FIG. 13B, the three emitters 15a, 15b, 15c of the collimator lens array 115 are arranged in the Slow axis direction, and the emitter width is about 1/10 of the lens focal length. The laser beams do not become parallel after being emitted from the collimator lens array 115, and form respective beam waists. In FIG. 13B, the relationship between the images of the three emitters formed by the collimator lens array 115 is schematically shown by arrows, and it can be seen that a beam waist is formed at the position of the downward arrow on the right side of the drawing. This is because an image formed by the collimator lens array 115 of the emitters 15a, 15b, and 15c placed at a distance s1 away from the collimator lens array 115 is formed at a position away from the collimator lens array 115 by a distance s2. is there. The laser beam in the slow axis direction is once narrowed by the collimator lens array 115 to form a beam waist, and then diverges as a whole. That is, only the combination of the semiconductor laser array 15 and the collimator lens array 115 makes the laser light in the Fast axis direction parallel, but the laser light in the Slow axis direction diverges and is not made parallel.

  FIG. 14 is a schematic view showing a state in which the spherical lens 45 is added to collimate the laser light, FIG. 14A shows the case of laser light in the Fast axis direction, and FIG. This is the case of laser light in the slow axis direction. Specifically, the spherical lens 45 is arranged on the beam waist in the Slow axis direction by the collimator lens array 115 shown in FIG. As shown in FIG. 14A, in the Fast axis direction, the laser beam collimated by the collimator lens array 115 is converged by the spherical lens 45 and forms an image at a predetermined position.

  On the other hand, with respect to the Slow axis direction, as shown in FIG. 14B, since the spherical lens 45 is disposed at the beam waist, that is, the imaging positions of the emitters 15a, 15b, and 15c by the collimator lens array 115, the spherical lens 45 acts as a field lens. Here, the field lens does not have an imaging function, but has an effect of changing only the direction of the laser beam. That is, the laser beam from the emitter 15a incident on the upper portion of the spherical lens 45 on the paper surface of FIG. 14B is largely bent in the downward direction, and conversely, the emitter incident on the lower portion of the spherical lens 45. The laser beam from 15c is greatly bent upward. As a result, the beam diameter of the entire laser beam that has passed through the spherical lens 45 remains constant for a while, and the parallel beam bundle is maintained up to the point indicated by the white arrow in the figure.

  FIG. 15 is a schematic diagram showing that a parallel beam bundle can be maintained over a longer distance by adding a spherical lens 49, and FIG. 15A shows the case of laser light in the Fast axis direction. (B) is a case of laser light in the slow axis direction. As shown in FIGS. 15A and 15B, a spherical lens 49 is further added at the position indicated by the white arrow in FIG. 14B.

  Regarding the laser light in the Fast axis direction, since the spherical lens 49 is arranged at the image forming position generated by the collimator lens array 115 and the spherical lens 45, the spherical lens 49 functions as a field lens, but is incident on the spherical lens 49. Since the laser beam passes only near the center of the lens, it hardly acts as a field lens for the laser beam.

  On the other hand, with respect to the laser beam in the slow axis direction, the laser beam is incident on the upper part and the lower part of the spherical lens 49 on the paper surface of FIG. The length that the parallel beam bundle is maintained is extended by the field lens action. Based on this idea, the parallel beam bundle can be further extended by adding a spherical lens 49 acting as a field lens to the image formation position by the spherical lens 45.

  Here, even if the two spherical lenses 45 and the spherical lens 49 that play the role of a field lens are cylindrical lenses that act only in the slow axis direction, the same effect of forming a parallel beam bundle can be obtained. FIG. 16 is a schematic diagram showing the behavior of a laser beam when the cylindrical lenses 401 and 402 are arranged. FIG. 16A shows the case of laser light in the Fast axis direction, and FIG. This is the case of laser light in the slow axis direction.

  As shown in FIG. 16A, the cylindrical lenses 401 and 402 do not have a function as a field lens for the laser light in the fast axis direction, so that the laser light collimated by the collimator lens array 115 remains parallel as it is. Propagate.

  On the other hand, in the Slow axis direction in which the cylindrical lenses 401 and 402 are arranged at a predetermined beam waist, the extension of the parallel beam bundle similar to the case described with reference to FIG. 15B can be expected. In any case, the collimator lens array 115 must have an array structure for accommodating multi-emitters, but the spherical lenses 45 and 49 and the cylindrical lenses 401 and 402 are expected to act as field lenses. It is only necessary to have a simple lens surface shape having no structure, and an inexpensive polishing lens can be adopted as the spherical lenses 45 and 49 and the cylindrical lenses 401 and 402.

  Although the housing structure is not shown in FIG. 11, cover means for covering the components on the base plate 30 is provided, and an opening is provided in a portion of the cover means where the laser beam is emitted, and a window glass is disposed. The hermetically sealed laser light source device 20 can be configured. Therefore, since dust and moisture proofing effects can be expected, not only the reliability of the semiconductor laser arrays 15, 16, 17, and 18 can be maintained and the life of the optical components can be extended, but also the brightness performance can be reduced due to contamination of the optical surface. It also becomes a countermeasure. Since the spatially synthesized laser beam is a parallel beam bundle, the cover means can be made compact to the extent that it interferes with the laser beam.

  As described in the first embodiment, a package type semiconductor laser array in which the semiconductor laser arrays 15, 16, 17, and 18 are individually enclosed by caps may be used. As shown in FIG. 13B, since the beam waist in the Slow axis direction by the collimator lens array 115 is formed immediately behind the collimator lens array 115, it is the second lens portion as shown in FIG. A sealed structure with a cap seal using the spherical lens 45 as an exit window can be provided. FIG. 17 is a schematic view of a sealed structure with a cap seal using the spherical lens 45 as an exit window.

  In this case, what is necessary is just to make it the structure which attaches the cap 111 on the stem 110 shown in FIG. The laser beam emitted from the spherical lens 45 that is a window glass is bent by the mirror 21 and then enters the spherical lens 49. The spherical lens 49 has a cut surface perpendicular to the surface of the stem 110 as shown in FIG. Similarly, the mirror 21 is arranged in a shifted state so that the laser beam is incident on one end of the mirror 21. By doing so, the laser beam from the semiconductor laser array on the opposite side to the traveling direction of the laser beam can pass immediately in the vicinity without interfering with the mirror 21 and the spherical lens 49.

  Even in the example described with reference to FIG. 16 in which the two spherical lenses are both cylindrical lenses, the same effect can be expected if the sealed structure shown in FIG. 18 is adopted. FIG. 18 is a schematic diagram of a hermetically sealed structure with a cap that uses a cylindrical lens 401 as an exit window. As shown in FIG. 18, a cylindrical lens 401 is attached to the cap 114, and the laser light beam bent by 90 degrees by the mirror 21 enters the cylindrical lens 402.

  As described above, in the laser light source device 20 according to the second embodiment, the plurality of laser light source units 71, 72, 73, and 74 are arranged in series, and the laser beams are identical by the mirrors 21, 22, 23, and 24. Since the light beams are reflected in the directions, it is possible to perform spatial synthesis of laser light while keeping the optical axes parallel to each other and suppressing an increase in etendue. Further, since the mirrors 21, 22, 23, and 24 can set the rotation angle with respect to the optical axis of the laser light emitted from the semiconductor laser arrays 15, 16, 17, and 18, the laser reflected in the second direction. The rotation angle can be determined so that the light does not interfere with the mirror of the laser light source unit adjacent to the traveling direction side, and the laser light source device 20 with less light loss can be configured.

  Further, the plurality of laser light source units 71, 72, 73, 74 arranged in series are arranged so that the directions of the major axes of the ellipse formed by the cross section of the laser light coincide. Therefore, according to the action of the mirrors 21, 22, 23, and 24, the laser beams from the plurality of semiconductor laser arrays 15, 16, 17, and 18 are made to have an elliptical short axis by setting a small rotation angle of several degrees or less. Can be rearranged as if they are arranged close to each other in the direction, and high-density spatial synthesis can be realized.

  In addition, the laser beam direction can be changed by simply adding two lenses, and the laser beam emitted from each laser light source unit can be collimated. Thus, the cover parts (cover means) covering them can be made compact, and it is possible to provide an inexpensive and small laser light source device 20.

<Embodiment 3>
Next, the laser light source device 150 and the video display device according to Embodiment 3 will be described. FIG. 19 is a schematic diagram illustrating the configuration of the video light source device according to the third embodiment. In the second embodiment, the same components as those described in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 19, the video display device according to the third embodiment includes a laser light source device 150, an integrator rod 42 that is a uniformizing unit, a relay lens 43 that is an illumination optical system, and a light that is a video display element. A bulb 5 and a projection lens 44 which is a projection optical system are provided.

  The laser light source device 150 includes a plurality of (for example, three) laser light source devices 1, mirrors 220, 230, and 240 that bend the laser array light beams from the laser light source devices 1, and lasers from the mirrors 220, 230, and 240. And a condensing lens 41 which is means for condensing the array light flux. Since the laser light source device 1 has a rectangular parallelepiped shape elongated in the optical axis direction, it is preferable in terms of space to spread the laser light source device 1 on the same plane. The laser array light beam condensed by the condensing lens 41 enters the integrator rod 42, and the intensity distribution is made uniform. The uniformized laser array light beam is irradiated to the light valve 5 as illumination light by the relay lens 43. The illumination light applied to the light valve 5 is spatially modulated in accordance with a video signal input from the outside, and the spatially modulated illumination light is enlarged and projected onto the screen 6 by the projection lens 44. Note that the laser light source device 150 may be composed of a plurality of laser light source devices 20.

  The mirrors 220, 230, and 240 are arranged in a staircase shape to spatially synthesize laser array light beams from the respective laser light source devices 1 and increase the light beam density. When the number of the laser light source devices 1 included in the laser light source device 150 is increased, the laser array light flux can be efficiently transmitted to the integrator rod 42 by changing the specification of the condenser lens 41.

  For example, FIG. 20 is a schematic diagram showing the distribution of the laser array light flux of the laser light source device 150. In other words, when three laser light source devices 1 are arranged side by side, the image distribution of the laser array light beam from each laser light source device 1 arranged on the incident surface of the condenser lens 41 is schematically shown. Due to the effect of the mirrors 220, 230, and 240 arranged in a staircase pattern, the image of the laser array beam is densely arranged along the x-axis. This is the same as the direction in which the laser light source device 1 is spread in FIG. Each laser array light beam is schematically shown as an elongated ellipse, and since the parallelism of the light beam is high in this short axis direction, it can be condensed by the condenser lens 41 at a very high density.

  On the other hand, since the parallelism of the light rays is low in the y-axis direction, it is more convenient not to arrange the laser array light beams in the direction along the y-axis. Further, according to the mirrors 220, 230, and 240, it is corrected that the outgoing light beam of the laser light source device 1 is inclined by the angle θ, and the optical axis of the combined laser light beam by the condenser lens 41 is changed to the vertical and horizontal directions of the laser light source device 150. And the advantage that the design of the video display device becomes easy.

  As described above, the video display device according to Embodiment 3 is made uniform by the laser light source device 150, the integrator rod 42 that equalizes the intensity distribution of the laser light emitted from the laser light source device 150, and the integrator rod 42. Relay lens 43 for irradiating the laser beam as illumination light, a light valve 5 for spatially modulating the illumination light in accordance with a video signal input from the outside, and illumination light spatially modulated by the light valve 5 on the screen 6 And a projection lens 44 that projects onto the projector. Therefore, it can be combined with a laser array light beam having a high spatial density and efficiently condensed, so that it is possible to increase the output.

  In addition, as described in the first and second embodiments, since the inexpensive and small laser light source device 1 and the laser light source device 20 can be realized, the inexpensive and small laser light source device 150 can be realized, and hence the inexpensive and small image. A display device can be realized.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  DESCRIPTION OF SYMBOLS 1 Laser light source device, 5 Light valve, 11, 12, 13, 14 Laser light source, 15, 16, 17, 18 Semiconductor laser array, 15a, 15b, 15c Emitter, 20 Laser light source device 21, 22, 23, 24 Mirror , 31 Mirror holder, 42 Integrator rod, 43 Relay lens, 44 Projection lens, 45, 46, 47, 48 Spherical lens, 61, 62, 63, 64, 71, 72, 73, 74 Laser light source unit, 115, 116, 117, 118 Collimator lens array, 150 laser light source device, 401, 402 Cylindrical lens.

Claims (3)

A multi-emitter laser light source having a plurality of emitters and emitting an elliptical laser beam in a first direction, and collimating a laser beam in the Fast axis direction among the laser beams emitted from the multi-emitter laser light source A first lens portion for converging laser light in the slow axis direction, and a beam waist formed by converging the laser light in the slow axis direction by the first lens portion and passing through the first lens portion; A plurality of laser light source units each having a second lens unit that changes the direction of the laser beam, and a mirror unit that reflects the laser beam changed in direction by the second lens unit in a second direction;
The plurality of laser light source units are arranged on the same plane, and adjacent laser light source units are arranged in series so that the directions of the major axes of the ellipses exhibited by the cross section of the laser light reflected in the second direction coincide with each other. Placed adjacent to each other,
Each of the mirror units is configured so that each of the laser light sources emits a predetermined angle between the direction of the major axis of the ellipse represented by the cross section of the laser beam reflected in the second direction and the second direction. A laser light source device capable of setting a rotation angle with respect to an optical axis of the emitted laser light. Each of the mirror portions is capable of reflecting the laser light so as to pass through the side of the mirror portion of the adjacent laser light source unit, and the rotation angle of the laser light emitted from each laser light source is relative to the optical axis. Set,
Optical axis of the laser beam reflected by the said mirror unit is substantially parallel to each other, the laser light source apparatus according to claim 1 Symbol placement. The laser light source device according to claim 1 or 2 ,
A uniformizing unit for uniformizing the intensity distribution of the laser light emitted from the laser light source device;
An illumination optical system for irradiating the laser light made uniform by the homogenizer as illumination light;
A video display element that spatially modulates the illumination light according to a video signal input from the outside;
A projection optical system that projects the illumination light spatially modulated by the image display element onto a screen;
A video display device comprising:

Images