Projection display device

Abstract

2. Description of the Related Art In the field of projection type image display devices that modulate and project laser light in response to image signals, there has been a demand for small, high-brightness devices. [Solution] A projection type display device comprising a first deflection element that deflects a laser beam of a first wavelength, a second deflection element that deflects a laser beam of a second wavelength, and a transfer optical system that enlarges and transfers the laser beam deflected and scanned by the first deflection element and the laser beam deflected and scanned by the second deflection element onto a reflective optical modulation element, wherein each of the first deflection element and the second deflection element is rotatable around a rotation axis, and the optical surface formed along the circumference is configured so that the inclination angle relative to the rotation axis changes along the circumference, and the inclination angle is configured so that when the optical surface is continuously rotated at a constant speed, the laser beam is recursively deflected in a constant direction at a constant deflection speed, and the rotation axis of the first deflection element and the rotation axis of the second deflection element are arranged along a common axis line.

Description

[Technical field]

[0001] The present invention relates to a projection display device equipped with a light source device. [Background technology]

[0002] 2. Description of the Related Art Projection type display devices using laser light have been known in the past.

[0003] Patent document 1 discloses a projection display device including a laser light source, an optical acousto-optic modulator that optically modulates the laser light in response to a video signal, a polygonal mirror that horizontally scans the modulated laser light, and a galvanometer mirror that vertically scans the modulated laser light.

[0004] Patent Document 2 discloses a projection display device that can obtain a high-quality projection image by irradiating a reflective light modulation element with laser light from three-color laser light sources. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2000-180759 A [Patent Document 2] JP 2023-143587 A Summary of the Invention [Problem to be solved by the invention]

[0006] The projection display device described in Patent Document 1 is equipped with an optical scanning means that combines a polygonal mirror for horizontal scanning and a galvanometer mirror for vertical scanning. However, because optical scanning is performed in both the horizontal and vertical directions, a large optical path space is required, resulting in a problem of the device becoming large.

[0007] The projection display device described in Patent Document 2 is capable of producing high-quality projected images, but the size of the device is not necessarily sufficiently small. Also, since sufficient consideration has not been given to temperature rise in the light source section, the efficiency of brightness relative to the input power is not necessarily high in some cases. In the field of projection type image display devices that modulate and project laser light in response to image signals, there has been a demand for small, high-brightness devices. [Means for solving the problem]

[0008] One aspect of the present invention includes a first integrator illumination system that forms a rectangular illumination area by superimposing the first-wavelength laser beams collimated by the first collimator lens, a first deflection element arranged on the first collimator lens side with respect to a position where the rectangular illumination area is formed by the first integrator illumination system, a second integrator illumination system that forms a rectangular illumination area by superimposing the second-wavelength laser beams collimated by the second collimator lens, and a first deflection element arranged on the first collimator lens side with respect to a position where the rectangular illumination area is formed by the first integrator illumination system, a second integrator illumination system that forms a rectangular illumination area by superimposing the second-wavelength laser beams collimated by the second collimator lens, and a first deflection element arranged on the first collimator lens side with respect to a position where the rectangular illumination area is formed by the second integrator illumination system. a transfer optical system that enlarges and transfers, onto a reflective light modulation element, the rectangular illumination area of ​​the first wavelength deflected and scanned by the first deflection element and the rectangular illumination area of ​​the second wavelength deflected and scanned by the second deflection element; and a projection lens that projects image light output by the reflective light modulation element, wherein each of the first deflection element and the second deflection element has a rotation axis and an optical surface formed along a circumference centered on the rotation axis, the optical surface being configured such that an inclination angle with respect to the rotation axis changes along the circumference, and the inclination angle is configured such that when the optical surface is continuously rotated around the rotation axis at a constant speed, the laser beam is recursively deflected in a constant direction at a constant deflection speed, and the rotation axis of the first deflection element and the rotation axis of the second deflection element are arranged substantially along a common axis. Effect of the Invention

[0009] According to the present invention, in the field of projection type image display devices that modulate and project laser light in response to image signals, it is possible to realize a small-sized, high-brightness device. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of an optical system of a projection display device according to a first embodiment. [Diagram 2] 1A is a schematic diagram showing one pair of a semiconductor laser and a collimating lens included in a laser module LM, and FIG. 1B is a schematic diagram showing a laser module LM in which pairs of a semiconductor laser 11 and a collimating lens 102 are arranged in a 4×2 array. [Diagram 3] 1A is a diagram illustrating a near-field pattern of the output light of the semiconductor laser 11, and FIG. 1B is a diagram illustrating a far-field pattern of the output light of the semiconductor laser 11. [Figure 4] (a) Graph showing beam spread in the parallel direction, (b) Graph showing beam spread in the orthogonal direction. [Diagram 5] FIG. 2 is a diagram for explaining an integrator illumination system. [Figure 6] (a) A diagram showing the integrator illumination system INT as viewed from one direction, (b) A diagram showing the integrator illumination system INT as viewed from a direction perpendicular to (a), and (c) A diagram showing a rectangular illumination area IM1. [Figure 7] (a) A diagram showing a bulk rod used in the intector illumination system, and (b) A diagram showing a hollow rod used in the intector illumination system. [Figure 8] 1A is a perspective view showing the appearance of an example of a deflector, and FIG. [Figure 9] 1A is a cross-sectional view illustrating the position and inclination angle of a reflecting surface of a deflector, and FIG. 1B is a graph illustrating the position and inclination angle of a reflecting surface of a deflector. [Figure 10] (a) is a diagram showing the positional relationship between the deflector and the rectangular irradiation area IM1, (b) is a diagram showing that the blue rectangular irradiation area IM1 is deflected and scanned in the DB direction. [Figure 11] (a) A schematic diagram for explaining the action of the front transfer lens 201 and the rear transfer lens 202. (b) A diagram showing the relationship between the screen of the reflective light modulation element 340 and the scanning range SA of the rectangular laser beam. (c) A diagram showing the irradiation of the screen of the reflective light modulation element 340 with rectangular B beams, G beams, and R beams, with the horizontal axis being the time axis. [Figure 12] FIG. 11 is a diagram showing a schematic configuration of an optical system of a projection display device according to a second embodiment. [Figure 13] FIG. 11 is a diagram showing a schematic configuration of an optical system of a projection display device according to a third embodiment. [Figure 14] FIG. 13 is a diagram showing a schematic configuration of an optical system of a projection display device according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A projection display device according to an embodiment of the present invention will be described with reference to the drawings. The following embodiment is merely an example, and those skilled in the art can appropriately modify the detailed configuration without departing from the spirit of the present invention. In the drawings referred to in the following description, elements with the same reference numbers have the same functions unless otherwise noted. The optical elements in the drawings are shown diagrammatically, and therefore do not necessarily faithfully represent the actual shapes and configurations. For example, even if a single lens is depicted in the drawings, it may be composed of multiple lenses unless otherwise noted.

[0012] In the following description, for example, when the X-plus direction is described, it refers to the same direction as the X-axis arrow in the illustrated coordinate system, and when the X-minus direction is described, it refers to the direction 180 degrees opposite to the X-axis arrow in the illustrated coordinate system. Also, when the X-direction is simply described, it refers to the direction parallel to the X-axis, regardless of whether it is different from the direction indicated by the X-axis arrow in the drawings. The same applies to directions other than X.

[0013] In the following description, red may be referred to as "R", green as "G", and blue as "B". Therefore, for example, R light is synonymous with red light, G light source is synonymous with green light source, and B laser is synonymous with blue laser. When describing optical elements corresponding to a specific color, a letter may be added to specify the color, such as B light source 100B and B deflector 210B. On the other hand, when describing matters common to the optical elements provided for each color, they may be described collectively without distinguishing the color, such as light source 100 and deflector 210.

[0014] [Embodiment 1] 1 is a diagram showing a schematic configuration of an optical system of a projection display device according to embodiment 1. For ease of explanation, the diagram omits mechanical mechanisms for installing optical elements, a housing, electrical wiring, and the like.

[0015] [Overall configuration] The projection display device 1000 includes a B light source 100B, a G light source 100G, an R light source 100R, a B deflector 210B, a G deflector 210G, an R deflector 210R, a light combining unit 220, an optical path conversion mirror 330, a TIR prism 350, a reflective light modulation element 340, and a projection lens 360. The projection display device 1000 may include a projection screen 190 as an option.

[0016] A front transfer lens 201 is disposed between the deflector 210 of each color and the light combining unit 220 , and a rear transfer lens 202 is disposed between the light combining unit 220 and the optical path conversion mirror 330 .

[0017] The B light source 100B includes a semiconductor laser that emits B light, the G light source 100G includes a semiconductor laser that emits G light, and the R light source 100R includes a semiconductor laser that emits R light. The light sources will be described in detail later.

[0018] The B deflector 210B is a deflector that deflects the B light emitted by the B light source 100B in the DB direction. Similarly, the G deflector 210G is a deflector that deflects the G light emitted by the G light source 100G in the DG direction, and the R deflector 210R is a deflector that deflects the R light emitted by the R light source 100R in the DR direction. The deflectors will be described in detail later.

[0019] The light combining unit 220 includes a dichroic mirror 221, a dichroic mirror 222, and a dichroic mirror 223. The dichroic mirror 221 has the optical characteristic of reflecting R light and transmitting G light and B light. The dichroic mirror 222 has the optical characteristic of reflecting G light and transmitting B light. The dichroic mirror 223 has the optical characteristic of reflecting B light.

[0020] On the dichroic mirror 222, the optical elements are arranged so that the optical axis center of the front transfer lens 201 for B light and the optical axis center of the front transfer lens 201 for G light overlap. Also, on the dichroic mirror 221, the optical elements are arranged so that the optical axis center of the front transfer lens 201 for B light, the optical axis center of the front transfer lens 201 for G light, and the optical axis center of the front transfer lens 201 for R light overlap.

[0021] The light combining unit 220 aligns the travel directions of the B light (dotted line), G light (solid line), and R light (dash-dotted line) in the X-positive direction, but combines these lights so that they do not overlap with each other at any timing. This is because the timing (deflection phase) of the deflection scanning by the B deflector 210B, G deflector 210G, and R deflector 210R is controlled so that the B light, G light, and R light do not overlap with each other on the screen of the reflective light modulation element 340. The scanning method will be described in detail later. The B light, G light, and R light emitted from the light combining unit 220 have their paths changed to the Z-negative direction by the optical path conversion mirror 330, and enter the TIR prism 350.

[0022] The TIR prism 350 is a total internal reflection prism formed by combining, for example, two prisms, and totally reflects the illumination light (B light, G light, R light) at the air gap surface and makes it incident at a predetermined angle on the reflective light modulation element 340. As described above, the B light, G light, and R light each illuminate a part of the screen of the reflective light modulation element 340 so as not to overlap each other.

[0023] The reflective light modulation element 340 may be, for example, a DMD in which micromirror devices are arranged in an array. The micromirrors corresponding to the display pixels are driven so that their reflection direction is changed by pulse width modulation according to the luminance level of the video signal. However, it is also possible to use other types of reflective light modulation devices, such as reflective liquid crystal devices.

[0024] The pixels in the screen area illuminated with the B light are driven according to the luminance level of the B component of the video signal, and reflect the B video light toward the TIR prism 350 at a predetermined angle. Similarly, the pixels in the screen area illuminated with the G light are driven according to the luminance level of the G component of the video signal, and reflect the G video light toward the TIR prism 350 at a predetermined angle. Moreover, the pixels in the screen area illuminated with the R light are driven according to the luminance level of the R component of the video signal, and reflect the R video light toward the TIR prism 350 at a predetermined angle. In this way, the modulation operation of the reflective light modulation device is performed in synchronization with the deflection scanning by the B deflector 210B, the G deflector 210G, and the R deflector 210R.

[0025] The image light (B image light, G image light, R image light) passes through the TIR prism 350, is guided to the projection lens 360, and is projected as a color image. The projection lens 360 is composed of one or more lenses, and may also have an automatic focus adjustment function and a zoom function.

[0026] The projection screen 190 is used when configuring a rear projection type display device. It is also often installed in front projection types, but it is not necessarily required to install one if the user wants to project onto a wall or other surface.

[0027] [light source] The B light source 100B, the G light source 100G, and the R light source 100R will be described. The B light source 100B includes a laser module LM-B including a semiconductor laser that emits B light and a collimating lens, the G light source 100G includes a laser module LM-G including a semiconductor that emits G light and a laser collimating lens, and the R light source 100R includes a laser module LM-R including a semiconductor laser that emits R light and a collimating lens. Apart from the emission wavelength of the semiconductor laser, the basic configuration of the light sources of each color is the same, so that in the following, they may be described simply as light source 100 without distinguishing between the colors of light. The light source 100 of each color includes a laser module LM and an integrator illumination system (including a folding mirror 406M), as will be described in order.

[0028] (Laser module) The light source 100 includes a laser module LM in which pairs of semiconductor lasers and collimating lenses are arranged in a one- or two-dimensional array.

[0029] Fig. 2(a) is a schematic diagram showing one pair of a semiconductor laser and a collimating lens included in the laser module LM. Reference numeral 11 denotes a semiconductor laser, and reference numeral 12 denotes a light-emitting portion of the semiconductor laser 11. In Fig. 2(a), the orientation of the XYZ coordinate system is shown in accordance with the arrangement shown in Fig. 1. In Fig. 2(a), the longitudinal direction H of the light-emitting portion 12 is parallel to the Y direction, and the traveling direction of the light emitted from the light-emitting portion 12 is parallel to the Z direction.

[0030] The longitudinal direction H of the light emitting section 12 is typically the direction in which an active layer sandwiched between a P-type cladding layer and an N-type cladding layer extends on the side surface of a semiconductor chip constituting the semiconductor laser 11. As shown in Fig. 2(a), in the following description, a direction parallel to the longitudinal direction H of the light emitting section 12 of the semiconductor laser 11 may be referred to as a "parallel direction" or a slow axis, and a direction perpendicular to the longitudinal direction of the light emitting section 12 may be referred to as an "orthogonal direction" or a fast axis. Linearly polarized light is emitted from the semiconductor laser 11, and the vibration direction of the electric field is the parallel direction (Y direction).

[0031] It is known that the output light of the semiconductor laser 11 has different angular characteristics depending on the emission direction. FIG. 3(a) shows an example of the near-field pattern of the output light, and FIG. 3(b) shows an example of the far-field pattern of the output light.

[0032] As shown in FIG. 3(a), the near-field pattern shows a beam profile that reflects the shape (longitudinal and lateral) of the light-emitting part. Meanwhile, as the beam travels, it spreads as shown in the far-field pattern of FIG. 3(b). That is, in the parallel direction, the beam emitted from the semiconductor laser 11 spreads little and travels in a pattern with a uniform intensity distribution within a narrow angular range. Meanwhile, in the perpendicular direction, the beam emitted from the semiconductor laser 11 has a mountain-shaped intensity distribution (Gaussian), and as it travels, it spreads to a wider angular range than the parallel direction. This is because the active layer of the semiconductor laser is significantly affected by diffraction when it is emitted, since the thickness in the perpendicular direction is small. The parallel direction with small spread in the far-field pattern can be called the slow axis, and the perpendicular direction with large spread can be called the fast axis.

[0033] In this embodiment, as shown in Fig. 2(a), a collimating lens 102 (first collimating lens) is used to shape the laser beam emitted from the semiconductor laser 11. That is, the light emitted from the light emitting unit 12, whose longitudinal length is Hy1, is collimated by the collimating lens 102 to become a beam having an elliptical cross section, which travels in the Z direction. The major axis of the elliptical shape is parallel to the X direction, and the minor axis is parallel to the Y direction.

[0034] Even after passing through the collimator lens 102, the beam does not become completely parallel to the optical axis (Z direction), and the beam spreads differently in the parallel direction (longitudinal direction of the light-emitting section) and the orthogonal direction (short direction of the light-emitting section). The difference in the spread of the beam after passing through the collimator lens 102 will be described with reference to Figures 4(a) and 4(b). Figure 4(a) shows the spread in the parallel direction, and Figure 4(b) shows the spread in the orthogonal direction.

[0035] As shown in Fig. 4(a), in the parallel direction, the top of the beam intensity is flat, but the beam diameter expands as it progresses in the Z direction, so the divergence cannot be said to be good. In contrast, as shown in Fig. 4(b), in the orthogonal direction, it can be seen that the change in the beam intensity distribution and beam diameter is small even if the distance from the collimator lens 102 changes. In other words, the laser beam after passing through the collimator lens 102 has higher parallelism in the orthogonal direction (fast axis of the semiconductor laser) than in the parallel direction (slow axis of the semiconductor laser), and has good divergence.

[0036] As described later, in the present invention, the divergence of the beam output from the light source 100 is excellent in the orthogonal direction (short side direction of the rectangle) (the beam has high parallelism), and the beam is deflected and scanned along the orthogonal direction to illuminate the light modulation element. This is because deflecting and scanning the beam along the direction in which the divergence is excellent is advantageous in preventing the B, G, and R color illumination areas from overlapping on the screen of the light modulation element.

[0037] The light source 100 includes a laser module LM including a plurality of pairs of semiconductor lasers and collimating lenses 102 (first collimating lenses). Fig. 2(b) is a schematic diagram showing a laser module LM in which pairs of semiconductor lasers 11 and collimating lenses 102 are arranged in a 4 x 2 array. Note that Fig. 2(b) shows the orientation of the XYZ coordinate system in accordance with Fig. 1.

[0038] In the laser module LM, multiple semiconductor lasers are arranged at equal intervals along the Y direction. In addition, all the semiconductor lasers are arranged so that the longitudinal direction of the light emitting section 12 is oriented along the Y direction. Although an example using a 4×2 element semiconductor laser is shown, the number of elements is not limited to this example. The laser module LM may be configured to arrange multiple semiconductor lasers in only one row or three or more rows along the Y direction. Even in the light source 100 having one row or three or more rows of semiconductor laser elements along the Y direction, the output beam has better divergence in the short direction of the light emitting section than in the long direction.

[0039] (Integrator illumination system / optical superimposition means) The light source 100 of this embodiment includes an integrator illumination system INT for forming a rectangular illumination area by overlapping a plurality of laser beams emitted from the laser module LM. The integrator illumination system INT will be described with reference to Figs. 5 to 7.

[0040] 5 is a diagram for explaining an integrator illumination system equipped with a rod integrator. The integrator illumination system according to this embodiment includes the above-mentioned laser module LM, a condenser lens 401, a diffusion element 402, a rod 403, and a relay lens 406, and forms a rectangular irradiation area IM1 (rectangular illumination area). The semiconductor laser, the light emitting unit 12 of the semiconductor laser, the collimator lens 102, and the like included in the laser module LM are as described with reference to FIGS. 2(a) to 4(b).

[0041] The laser beams emitted from each of the semiconductor lasers included in the laser module LM are made approximately parallel by the action of the collimating lens 102, with divergence being as already explained. The approximately collimated laser beams output from the laser module LM are focused by the focusing lens 401 toward the incident surface INP of the rod 403. In Fig. 5, the focusing lens 401 is shown as one convex lens, but it may be composed of multiple lenses for the purpose of suppressing aberration, etc.

[0042] A diffusion element 402 is disposed near the incident surface INP of the rod 403, and the laser beam diffused by the diffusion element 402 enters the rod 403 from the incident surface INP. The beam output from the laser module LM has better divergence in the short direction of the rectangle than in the long direction, so that the light intake loss at the incident surface INP of the rod 403 can be suppressed and the utilization efficiency can be improved. The light incident on the rod 403 is repeatedly totally reflected on the side surfaces and then exits from the exit surface EXP, and the illuminance distribution at the exit surface EXP can be made uniform by appropriately setting the diffusion ability (diffusion angle) of the diffusion element 402 and the length of the rod 403.

[0043] By transferring the image emitted from the exit surface EXP of the rod 403 by the relay lens 406, a rectangular irradiation area IM1 (rectangular illumination area) with high uniformity of illuminance can be obtained. By appropriately setting the transfer magnification of the relay lens, it is possible to obtain a desired size of the irradiation area IM1, which is reduced, equal, or enlarged. In FIG. 5, the relay lens 406 is composed of two lenses, a front convex lens 406a and a rear convex lens 406b, but the configuration of the relay lens 406 is not limited to this example. A folding mirror 406M is provided between the front convex lens 406a and the rear convex lens 406b to change the traveling direction of the laser light to the X-plus direction.

[0044] Fig. 6(a) is a diagram showing light source 100 including integrator illumination system INT in a direction in which the short side direction (X direction) of light emitting section 12 of the semiconductor laser is visible. For convenience of illustration, the change in the optical path caused by the action of folding mirror 406M is not shown in the figure. Fig. 6(b) is a diagram showing light source 100 including integrator illumination system INT in a direction in which the long side direction (Y direction) of light emitting section 12 of the semiconductor laser is visible.

[0045] The rod 403 may be any optical element capable of totally reflecting incident light on its side surface, for example, the one shown in Fig. 7(a) or the one shown in Fig. 7(b) may be used. Preferably, the rod 403 is configured so that the shape of the incident surface INP, the shape of the exit surface EXP, and the cross-sectional shape of the rod portion are the same.

[0046] 7(a) is a solid rectangular prism-shaped element made of an optical material such as optical glass or transparent resin, and the end faces, the entrance face INP and the exit face EXP, are rectangular with a long side H0 and a short side V0. It is desirable to provide an anti-reflection coating (AR coating) on ​​the entrance face INP and the exit face EXP.

[0047] 7(b) is a hollow rectangular prism, i.e., a cylindrical element, and a reflective surface made of, for example, aluminum is formed on the inner surface of the cylinder. The entrance surface INP and exit surface EXP, which are the openings of the cylinder, are rectangular with a long side of H0 and a short side of V0. For example, it can be manufactured relatively inexpensively by evaporating a reflective film such as an aluminum film onto a glass or metal plate-like substrate, and then assembling the substrates into a cylindrical shape.

[0048] The shape of the incident surface INP and the exit surface EXP of the rod 403 is a rectangle with a long side H0 and a short side V0 as described above, but the relay lens 406 forms a rectangular irradiation area IM1 (rectangular illumination area) with a long side H1 and a short side V1 as shown in FIG. 6(c). The long side of the rectangular irradiation area IM1 corresponds to the parallel direction (slow axis direction of the semiconductor laser), and the short side corresponds to the orthogonal direction (fast axis direction of the semiconductor laser). For example, if the shape of the incident surface INP and the exit surface EXP of the rod 403 is a rectangle with an X direction (short side V0) of 0.33 mm and a Y direction (long side H0) of 1.67 mm, and the magnification of the relay lens 406 is set to 1.2 times, a rectangular irradiation area IM1 with V1 of 0.4 mm and H1 of about 2 mm can be obtained.

[0049] In addition, the rod 403 is shown as an example having a configuration in which the shape of the incident surface INP, the shape of the exit surface EXP, and the cross-sectional shape of the rod portion are the same, but a rod in which the shape of the incident surface INP and the shape of the exit surface EXP are different, such as a so-called tapered rod, may also be used.

[0050] The integrator illumination system is not limited to a form using a rod integrator, and may be, for example, a pair of a first microlens array and a second microlens array arranged on the optical path. The focal lengths of the spherical microlenses of the first microlens array and the spherical microlenses of the second microlens array can be set so that they can form images at the spherical positions of each other. In this way, an integrator illumination system INT can be configured that overlaps the laser beams emitted from the semiconductor lasers.

[0051] Alternatively, instead of a microlens array in which spherical microlenses are arranged two-dimensionally, an array of striped microlenses (cylindrical lenses) in the X direction and an array of striped microlenses (cylindrical lenses) in the Y direction may be provided independently. With such a configuration, the focal length and the array interval can be set regardless of the stripe pitch, which makes it possible to suppress unstable capture caused by an insufficient number of array divisions and to easily generate a more elongated and uniform rectangular spot.

[0052] Alternatively, a diffractive diffusion element (a so-called top hat element) may be disposed instead of the pair of microlens arrays. As long as the top hat element has different diffusion angles in the X and Y directions, it is not necessary to provide two pieces, and it is also possible to configure with one piece.

[0053] (deflector) As shown in Fig. 1, deflectors (B deflector 210B, G deflector 210G, R deflector 210R) are arranged between the light sources 100 (B light source 100B, G light source 100G, R light source 100R) and the rectangular irradiation area IM1 (rectangular illumination area) illuminated by each of them. Here, the B deflector 210B, G deflector 210G, and R deflector 210R will be described. These are deflection elements used to deflect and scan laser beams of different colors, but since they have the same basic configuration, they may be described below as deflector 210 without specifying the color.

[0054] FIG. 8(a) is a perspective view showing an example of the deflector 210, and FIG. 8(b) is a side view of the deflector 210. The deflector 210 includes a rotatable disk-shaped base 211 and a motor 212 for rotating the base 211 around a rotation axis AX. A reflecting surface 213, which is a strip-shaped optical surface, is provided on the main surface of the disk-shaped base 211 along the circumference. In order to specify the position of the reflecting surface, an angle coordinate is set counterclockwise around the rotation axis AX as shown in FIG. 8(a). (In the figure, 0°, 90°, 180°, and 270° are shown.) The axis BX shown in the figure is an axis that is parallel to the rotation axis AX and passes through the reflecting surface 213. The beam irradiation position 214 is the beam position when the beam output from the light source 100 is reflected before reaching the rectangular irradiation area IM1.

[0055] The belt-shaped reflecting surface 213 is twisted so that the angle with respect to the axis BX (i.e., the rotation axis AX) changes depending on the position. The angle of the reflecting surface will be described with reference to Figures 9(a) and 9(b). In Figures 9(a) and 9(b), the positions of the reflecting surface are shown as positions defined by the angle coordinates explained in Figure 8(a). Also, the inclination angle of the reflecting surface is shown as the inclination angle of the reflecting surface when the main surface of the disk-shaped base 211 (i.e., the surface perpendicular to the axis BX) is used as the reference.

[0056] As shown in Fig. 9(b), the reflecting surface 213 is configured so that the inclination angle of the reflecting surface changes linearly with respect to the position of the reflecting surface. As shown in Fig. 8(a) and Fig. 9(b), the inclination angle of the reflecting surface becomes discontinuous when the position of the reflecting surface is 0° (360°), so for convenience of explanation, Fig. 9(a) shows the inclination angles when the positions of the reflecting surface are 1° and 359°.

[0057] When the base 211 is rotated in the R direction by the motor 212, the reflecting surface 213 also rotates around the rotation axis AX, so that the angular coordinates of the portion irradiated with the laser beam at the beam irradiation position 214 shown in Figure 8(a) change continuously as follows: 0° → 90° → 180° → 360° (=0°) → 90°,...

[0058] Even if the reflecting surface rotates and the part of the reflecting surface irradiated with the laser beam changes, the incident beam always enters the reflecting surface 213 at an angle of α with respect to the axis BX, as shown in FIG. 9(a). Meanwhile, the inclination angle of the reflecting surface changes within the range of -θ to +θ depending on the position of the reflecting surface. Therefore, as shown in FIG. 9(a), the direction of the laser beam reflected by the reflecting surface 213 changes within an angle range of 4θ from (α-2×θ) to (α+2×θ) with respect to the axis BX. In other words, the inclination angle is configured such that when the optical surface (reflecting surface) is continuously rotated at a constant speed, the laser beam is recursively deflected in a constant direction at a constant deflection speed,

[0059] In other words, as shown in FIG. 8(b), the deflector 210 can deflect and scan the outgoing beam within an angle range from RD1 ((α-2×θ) with respect to the axis BX) to RD2 ((α+2×θ) with respect to the axis BX). When the reflecting surface 213 is continuously rotated in the R direction in FIG. 8(a), the outgoing beam is continuously deflected (scanned) from RD1 to RD2 in FIG. 8(b), and when it reaches RD2, it returns instantly to RD1 and is deflected (scanned) again toward RD2. Also, if the reflecting surface 213 is rotated in the opposite direction to the R direction, the outgoing beam is continuously deflected (scanned) from RD2 to RD1 in FIG. 8(b), and when it reaches RD1, it returns instantly to RD2 and is deflected (scanned) again toward RD1.

[0060] In this way, the deflector 210 can perform recursive deflection scanning of the laser beam in a predetermined direction at a constant speed by a simple driving method of continuously rotating the rotor at a constant speed. As described later, the illumination light can be scanned in the V direction on the screen of the reflective light modulation element 340 by controlling the motor 212 so that it rotates in synchronization with the driving timing of the reflective light modulation element 340 (or the image signal input to the reflective light modulation element 340).

[0061] Fig. 10(a) shows the positional relationship between the deflector 210 and the rectangular irradiation area IM1. The coordinate system is shown based on the B light source 100B, but the same is true for the G light source 100G and the R light source 100R. The deflector 210 is disposed on the semiconductor laser side (collimator lens side) with respect to the position where the rectangular irradiation area IM1 (rectangular illumination area) is formed by the integrator illumination system. As shown in Fig. 10(b), the blue rectangular irradiation area IM1 is deflected and scanned in the direction DB according to the rotation of the deflector 210.

[0062] Regarding the manufacturing method of the deflector 210, the disk-shaped base 211 on which the band-shaped reflecting surface 213 is provided along the circumference can be manufactured at low cost by processing a metal base material by, for example, a press extrusion method. As illustrated in FIG. 9(a), there are parts protruding from the main surface of the base 211 and parts recessed from the main surface in the vicinity of the reflecting surface 213. In order to improve the rotation balance, it is desirable to make the cross-sectional area of ​​the base 211 equal at any position when viewed in a cross section passing through the rotation axis AX. In addition, the maximum height of the base 211 protruding from the main surface and the maximum depth of the base 211 recessed from the main surface are desirably 3 / 4 or less of the average plate thickness in order to reduce wind noise. Specifically, the average plate thickness of the base 211 is desirably 0.7 mm or more and 2 mm or less, and θ is desirably 3° or more and 6° or less.

[0063] By the deflector described above, the rectangular irradiation areas IM1 of each color formed by the B, G, and R laser beams are deflected and scanned in the directions DB, DG, and DR, respectively, as shown in Fig. 1. Although DB, DG, and DR are in the same direction, the B, G, and R laser beams are deflected and scanned with a phase difference, so they do not overlap each other on the screen of the reflective light modulation element 340.

[0064] (Photosynthesis) The laser beams of each color deflected and scanned by the deflectors of each color are aligned in the same traveling direction by the light combining section 220, and the function of the light combining section 220 has already been explained in the section on the overall configuration.

[0065] (Transfer optical system) A rectangular irradiation area IM1 formed by the laser beams of each color is enlarged and transferred onto the screen of the reflective light modulation element 340 by a transfer lens (first transfer optical system) consisting of a front transfer lens 201 and a rear transfer lens 202 for each color. The front transfer lens 201 and the rear transfer lens 202 are each a convex lens with positive power.

[0066] FIG. 11(a) is a schematic diagram for explaining the action of the front transfer lens 201 and the rear transfer lens 202. The figure illustrates the case of a B light source in which a dichroic mirror 221, a dichroic mirror 222, and a dichroic mirror 223 are interposed between the front transfer lens 201 and the rear transfer lens 202, but for convenience of illustration, the change in the traveling direction by the dichroic mirror is not shown. As shown in the figure, a rectangular irradiation area IM1 is enlarged and transferred as a rectangular secondary transfer image IM2. The positions of each optical element are set so that the rectangular secondary transfer image IM2 is transferred to the screen position of the reflective light modulation element 340 as shown in FIG. The transfer magnification for enlarging the rectangular irradiation area IM1 to a rectangular secondary transfer image IM2 is, for example, about 6 times (V1:V2=1:6).

[0067] 11(b) shows the relationship between the screen of the reflective light modulation element 340 and the scanning range SA of the rectangular laser beam. If the screen size of the reflective light modulation element 340 is H (horizontal direction) × V (vertical direction), the scanning range SA of the rectangular laser beam covers an area of ​​H' × V' that is larger than the screen size. Note that the scanning range SA of the rectangular laser beam is enlarged by the transfer magnification described above with respect to the scanning range in which the rectangular irradiation area IM1 is scanned by the deflector 210.

[0068] 11(c) is a diagram showing how rectangular B, G, and R beams are irradiated onto the screen of the reflective light modulation element 340, with the horizontal axis being the time axis. The B, G, and R beams vertically scan the screen of the reflective light modulation element 340 along the scanning direction SD, completing the scanning of one screen in one frame time. In order to prevent color mixing at the boundary between each color region, the B, G, and R beams are configured not to overlap each other, and the vertical width V2 of each beam is necessarily configured to be 1 / 3 or less of V'. The vertical width V2 of each beam can be set to be 1 / 6 or more and 1 / 3 or less of the vertical width V of the screen of the reflective light modulation element 340.

[0069] As described above, the projection display device of this embodiment has lighting units each equipped with a plurality of semiconductor lasers, a collimating lens, an integrator illumination system, and a deflection element, each for a different color of light, and has a light combining section that combines the illumination light output by the lighting units of different color lights, and the rectangular illumination areas output by each of the lighting units of different color lights are enlarged and transferred to a reflective light modulation element while being deflected and scanned so as not to overlap each other.

[0070] (Characteristic configuration of this embodiment) As shown in Fig. 1, in this embodiment, the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged so that their respective rotation axes AX are parallel to each other, except for inevitable manufacturing errors. Furthermore, it is preferable that the rotation axes AX of the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged substantially along a common axis CW, except for inevitable manufacturing errors. In other words, it is preferable that the rotation axes AX of the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged substantially on the same line, except for inevitable manufacturing errors.

[0071] According to this embodiment, the light sources 100R, 100G, and 100B of the respective colors, which are configured with the same optical layout, are shifted from each other in the X direction and the Z direction in the XZ plane and arranged in the same direction. Therefore, the optical path spaces of the three color laser lights are compact as a whole, and the projection type display device 1000 can be configured to be extremely small.

[0072] In addition, in the conventional device, especially when performing high-brightness display, the laser module becomes hot due to heat generation, and the light emission efficiency of the semiconductor laser decreases, which may cause problems. In this respect, according to the present embodiment, the laser module LM-R, the laser module LM-G, and the laser module LM-B are arranged parallel to the common axis CW, and the airflow of the air-cooling mechanism (not shown) may be set so that the air for cooling flows along the laser module arranged parallel to the common axis CW. In other words, by arranging the blower and the flow path defining member so that the air for cooling flows along the laser module arranged parallel to the common axis CW, the temperature rise of the laser module can be suppressed by a compact and highly efficient cooling system.

[0073] According to this embodiment, in the field of projection type image display devices that modulate and project laser light in response to image signals, it is possible to realize a small-sized, high-brightness device.

[0074] [Embodiment 2] Fig. 12 is a diagram showing a schematic configuration of an optical system of a projection display device according to embodiment 2. For ease of explanation, mechanical mechanisms for installing optical elements and electrical wiring are omitted in this figure, and reference symbols are omitted for elements common to Fig. 1 of embodiment 1. Explanations of matters common to embodiment 1 of this embodiment will be simplified or omitted.

[0075] [Overall configuration] The projection display device 2000 of this embodiment includes a B light source 100B, a G light source 100G, an R light source 100R, a B deflector 210B, a G deflector 210G, an R deflector 210R, a transfer lens composed of a front transfer lens 201 and a rear transfer lens 202, a light combining section 220, an optical path conversion mirror 330, a TIR prism 350, a reflective light modulation element 340, a projection lens 360, and an exterior cover 505, and the basic configuration of the optical system is the same as in embodiment 1.

[0076] This embodiment further includes a cooling system that cools the laser modules LM of each color by liquid cooling. The cooling system includes a liquid cooling unit 501 arranged near the laser module LM, a pipe 502 for circulating liquid between the liquid cooling unit 501 and a radiator 503, a radiator 503 for dissipating heat from the laser module LM carried by the circulating liquid into the air, and a fan 504 for blowing air onto the radiator to efficiently dissipate heat. Examples of the liquid used to cool the laser module LM include water and oil, but other liquids may also be used. The liquid may be naturally circulated by the temperature gradient that occurs, or may be forcibly circulated through the circulation flow path by providing a pump (not shown).

[0077] As shown in Fig. 12, in this embodiment, the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged so that their respective rotation axes AX are parallel to each other, except for inevitable manufacturing errors. Furthermore, it is preferable that the rotation axes AX of the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged substantially along a common axis CW, except for inevitable manufacturing errors. In other words, it is preferable that the rotation axes AX of the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged substantially on the same line, except for inevitable manufacturing errors.

[0078] According to this embodiment, the light sources 100R, 100G, and 100B of the respective colors, which are configured with the same optical layout, are shifted from each other in the X direction and the Z direction and arranged in the same direction. Therefore, the optical path spaces of the three color laser beams are compact as a whole, and the projection type display device 2000 can be made extremely small.

[0079] In addition, in the conventional device, when performing a high-brightness display, the laser module becomes hot due to heat generation, and the light emission efficiency of the semiconductor laser decreases, which can cause problems. In this regard, according to the present embodiment, the laser module LM-R, the laser module LM-G, and the laser module LM-B are arranged parallel to the common axis CW. Therefore, for the liquid cooling mechanism, it is sufficient to arrange the piping of the flow path and the radiator so that the cooling liquid flows along the liquid cooling unit arranged parallel to the common axis CW, and the temperature rise of the laser module can be suppressed with a compact and highly efficient cooling system.

[0080] [Embodiment 3] 13 is a diagram showing a schematic configuration of an optical system of a projection display device according to embodiment 3. For ease of explanation, mechanical mechanisms for installing optical elements and electrical wiring are omitted in the figure. Explanations of matters common to embodiment 1 will be simplified or omitted.

[0081] [Overall configuration] The projection display device 3000 of this embodiment is similar to embodiment 1 in that it includes a B light source 100B, a G light source 100G, an R light source 100R, a B deflector 210B, a G deflector 210G, an R deflector 210R, a transfer lens composed of a front transfer lens 201 and a rear transfer lens 202, an optical path conversion mirror 330, a TIR prism 350, a reflective light modulation element 340, and a projection lens 360.

[0082] In the first embodiment, three dichroic mirrors (dichroic mirror 221, dichroic mirror 222, dichroic mirror 223) having different optical characteristics are used to configure light combining unit 220. In contrast, in the present embodiment, four dichroic mirrors are used to configure the light combining unit.

[0083] The dichroic mirror 223 shown in FIG. 13 has the optical characteristic of reflecting B light, as in the first embodiment. The dichroic mirror 222 has the optical characteristic of reflecting G light. The dichroic mirror 221A has the optical characteristic of transmitting R light but reflecting G light. The dichroic mirror 221B has the optical characteristic of transmitting B light but reflecting R light and G light. Therefore, the B light is reflected by the dichroic mirror 223 and then transmitted through the dichroic mirror 221B. The G light is reflected by the dichroic mirror 222, the dichroic mirror 221A, and the dichroic mirror 221B in that order. The R light is reflected by the dichroic mirror 221B after transmitting through the dichroic mirror 221A.

[0084] In this manner, in the light combining section of this embodiment, the laser beams of each color are combined by being reflected an odd number of times by the dichroic mirror. Therefore, by rotating the R deflector 210R, the G deflector 210G, and the B deflector 210B in the same direction, it is possible to deflect and scan the light of each color in the same direction on the screen of the reflective light modulation element 340, and the driving control of the deflectors is easy.

[0085] As shown in Fig. 13, in this embodiment, the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged so that their respective rotation axes AX are parallel to each other, except for inevitable manufacturing errors. Furthermore, it is preferable that the rotation axes AX of the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged substantially along a common axis CW, except for inevitable manufacturing errors. In other words, it is preferable that the rotation axes AX of the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged substantially on the same line, except for inevitable manufacturing errors.

[0086] According to this embodiment, the light sources 100R, 100G, and 100B of the respective colors, which are configured with the same optical layout, are shifted from each other in the X direction and the Z direction and arranged in the same direction. Therefore, the optical path spaces of the three color laser lights are compact as a whole, and the projection type display device 3000 can be made extremely small.

[0087] In addition, in the conventional device, especially when performing high-brightness display, the laser module becomes hot due to heat generation, and the light emission efficiency of the semiconductor laser decreases, which may cause problems. In this regard, according to this embodiment, the laser module LM-R, the laser module LM-G, and the laser module LM-B are arranged parallel to the common axis CW. Therefore, for the air-cooling cooling mechanism (not shown), it is sufficient to arrange an airflow flow path regulating member or an air blower so that the air for air cooling flows along the laser module arranged parallel to the common axis CW, and the temperature rise of the laser module can be suppressed with a compact and highly efficient cooling system. Alternatively, when a liquid-cooling cooling mechanism is provided as in the second embodiment, it is sufficient to arrange a flow path pipe or a radiator so that the cooling liquid flows along the liquid-cooling unit arranged parallel to the common axis CW, and the temperature rise of the laser module can be suppressed with a compact and highly efficient cooling system.

[0088] [Embodiment 4] 14 is a diagram showing a schematic configuration of an optical system of a projection display device according to embodiment 4. For ease of explanation, mechanical mechanisms for installing optical elements and electrical wiring are omitted in the figure. Explanations of matters common to embodiment 1 will be simplified or omitted.

[0089] [Overall configuration] The projection display device 4000 of this embodiment is similar to embodiment 1 in that it includes a B light source 100B, a G light source 100G, an R light source 100R, a B deflector 210B, a G deflector 210G, an R deflector 210R, a transfer lens composed of a front transfer lens 201 and a rear transfer lens 202, an optical path conversion mirror 330, a TIR prism 350, a reflective light modulation element 340, and a projection lens 360.

[0090] In the first embodiment, three dichroic mirrors (dichroic mirror 221, dichroic mirror 222, dichroic mirror 223) having different optical characteristics are used to configure light combining unit 220. In the present embodiment, dichroic mirror 221C having optical characteristics different from dichroic mirror 221, dichroic mirror 222, and dichroic mirror 223 are used to configure the light combining unit.

[0091] The dichroic mirror 223 has the optical characteristic of reflecting B light, as in the first embodiment. The dichroic mirror 222 has the optical characteristic of transmitting B light and reflecting G light, as in the first embodiment. The dichroic mirror 221C has the optical characteristic of transmitting R light but reflecting G and B light. Therefore, after being reflected by the dichroic mirror 223, the B light passes through the dichroic mirror 222 and is reflected by the dichroic mirror 221C. The G light is reflected by the dichroic mirror 22 and the dichroic mirror 221C. The R light passes through the dichroic mirror 221C.

[0092] In this way, the light combining unit of this embodiment is configured to reflect each color laser beam 0 or an even number of times by the dichroic mirror. Therefore, by rotating the R deflector 210R, the G deflector 210G, and the B deflector 210B in the same direction, it is possible to deflect and scan each color light in the same direction on the screen of the reflective light modulation element 340, and driving control of the deflectors is easy.

[0093] As shown in Fig. 14, in this embodiment, the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged so that their respective rotation axes AX are parallel to each other, except for inevitable manufacturing errors. Furthermore, it is preferable that the rotation axes AX of the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged substantially along a common axis CW, except for inevitable manufacturing errors. In other words, it is preferable that the rotation axes AX of the R deflector 210R, the G deflector 210G, and the B deflector 210B are arranged substantially on the same line, except for inevitable manufacturing errors.

[0094] According to this embodiment, the light sources 100R, 100G, and 100B of each color, which are configured with the same optical layout, are shifted from each other in the X direction and the Z direction and arranged in the same direction. Therefore, the optical path space of the three color laser lights is compact as a whole, and the projection type display device 4000 can be made extremely small. In particular, compared to the embodiments shown in Figs. 1 and 13, the configuration shown in Fig. 14 can make the device size in the X direction more compact.

[0095] In addition, in the conventional device, especially when performing high-brightness display, the laser module becomes hot due to heat generation, and the light emission efficiency of the semiconductor laser decreases, which may cause problems. In this regard, according to this embodiment, the laser module LM-R, the laser module LM-G, and the laser module LM-B are arranged parallel to the common axis CW. Therefore, for the air-cooling cooling mechanism (not shown), it is sufficient to arrange an airflow flow path regulating member or an air blower so that the air for air cooling flows along the laser module arranged parallel to the common axis CW, and the temperature rise of the laser module can be suppressed with a compact and highly efficient cooling system. Alternatively, when a liquid-cooling cooling mechanism is provided as in the second embodiment, it is sufficient to arrange a flow path pipe or a radiator so that the cooling liquid flows along the liquid-cooling unit arranged parallel to the common axis CW, and the temperature rise of the laser module can be suppressed with a compact and highly efficient cooling system.

[0096] [Other embodiments] The present invention is not limited to the above-described embodiment, and many modifications are possible within the technical concept of the present invention.

[0097] In each embodiment, the transfer optical system used to transfer the image is preferably configured so that both sides are telecentric, but may be otherwise. For one or more of these transfer optical systems, for example, a so-called anamorphic optical system (anamorphic lens) having different optical characteristics at two cross sections around the optical axis may be used. In this way, if the transfer optical system is an anamorphic optical system, it is possible to reduce or increase the magnification in only one direction, making it possible to adjust the NA and the aspect of the transferred image, and thus improving the light utilization efficiency.

[0098] The cooling mechanism for cooling the semiconductor laser may be, for example, a Peltier element arranged along a plurality of laser modules arranged parallel to the common axis CW. Alternatively, a thermal conductor (for example, a metal member or a pipe for circulating a coolant) may be arranged along a plurality of laser modules arranged parallel to the common axis CW, and the thermal conductor may be cooled by a Peltier element.

[0099] In the embodiment, a projection display device having three laser light sources of B, G, and R is exemplified, but the embodiment of the present invention is not limited to this example, and can be applied to a projection display device having a plurality of laser light sources with different wavelengths. For example, the number of laser light sources with different wavelengths may be two, four (e.g., B, G, R, and yellow), or five or more. By shifting the light sources of each color configured with the same optical layout in the X and Z directions in the XZ plane and arranging them in the same direction, the optical path space of the laser light of the multiple colors can be made compact as a whole, and the projection display device can be configured to be extremely small.

[0100] This specification discloses at least the following: [Item 1] A plurality of semiconductor lasers of a first wavelength; a first collimating lens that collimates a plurality of laser beams output from the plurality of first-wavelength semiconductor lasers; a first integrator illumination system that forms a rectangular illumination area by superimposing a plurality of first-wavelength laser beams collimated by the first collimator lens; a first deflection element disposed on the first collimator lens side with respect to a position where the rectangular illumination area is formed by the first integrator illumination system; A plurality of second wavelength semiconductor lasers; a second collimating lens that collimates the laser beams output from the second-wavelength semiconductor lasers; and a second integrator illumination system that forms a rectangular illumination area by superimposing a plurality of laser beams having a second wavelength collimated by the second collimator lens; a second deflection element disposed on the second collimator lens side with respect to a position where the rectangular illumination area is formed by the second integrator illumination system; a transfer optical system that enlarges and transfers the rectangular illumination area of ​​the first wavelength that is deflected and scanned by the first deflection element and the rectangular illumination area of ​​the second wavelength that is deflected and scanned by the second deflection element onto a reflective light modulation element; a projection lens that projects the image light output by the reflective light modulation element, Each of the first deflection element and the second deflection element includes a rotation axis and an optical surface formed along a circumference centered on the rotation axis, the optical surface is configured such that an inclination angle relative to the axis of rotation varies along the circumference; the tilt angle is configured such that continuous rotation of the optical surface about the axis of rotation at a constant speed recursively deflects the laser beam in a constant direction at a constant deflection speed; the axis of rotation of the first deflection element and the axis of rotation of the second deflection element are disposed substantially along a common axis. 1. A projection display device comprising: [Matter 2] the first deflection element and the second deflection element rotate in the same direction about their respective rotation axes; 2. The projection display device according to item 1, [Matter 3] a light combining unit that combines the laser beam of the first wavelength deflected and scanned by the first deflection element and the laser beam of the second wavelength deflected and scanned by the second deflection element so as not to overlap each other; 3. The projection display device according to item 1 or 2, [Matter 4] the light combining unit combines the laser beam of the first wavelength deflected and scanned by the first deflection element and the laser beam of the second wavelength deflected and scanned by the second deflection element by reflecting them an odd number of times, respectively. 4. The projection display device according to item 3, [Matter 5] the light combining unit combines the laser beam of the first wavelength deflected and scanned by the first deflection element and the laser beam of the second wavelength deflected and scanned by the second deflection element by reflecting them zero times or an even number of times, respectively. 4. The projection display device according to item 3, [Matter 6] a first laser module including the plurality of first-wavelength semiconductor lasers and a second laser module including the plurality of second-wavelength semiconductor lasers are arranged parallel to the common axis; 6. The projection display device according to any one of items 1 to 5, [Matter 7] a cooling mechanism for cooling the first laser module and the second laser module is disposed parallel to the common axis; 7. The projection display device according to item 6, [Matter 8] the cooling mechanism is an air-cooling mechanism that cools the first laser module and the second laser module by airflow; 8. The projection display device according to item 7, [Matter 9] the cooling mechanism is a liquid cooling mechanism that cools the first laser module and the second laser module by a circulating liquid; 8. The projection display device according to item 7, [Matter 10] each of the first integrator illumination system and the second integrator illumination system includes a rod, a condenser lens that condenses the plurality of laser beams collimated by the collimator lens toward the rod, a diffusion element disposed near an entrance surface of the rod, and a relay lens that transfers an image of an exit surface of the rod; 10. The projection display device according to any one of items 1 to 9, [Explanation of symbols]

[0101] 11···Semiconductor laser / 12···Light emitting section / 100···Light source / 100B···B light source / 100G···G light source / 100R···R light source / 102···Collimating lens / 190···Projection screen / 201···Front transfer lens / 202···R transfer lens / 210···Deflector / 210B···B deflector / 210G···G deflector / 210R···R deflector / 211···Base / 212···Motor / 213···Reflecting surface / 214···Beam irradiation position positioning / 220···light combining section / 221, 222, 223···dichroic mirror / 330···light path conversion mirror / 340···reflective light modulation element / 350···TIR prism / 360···projection lens / 401···condenser lens / 402···diffusion element / 403···rod / 406···relay lens / 406a···front convex lens / 406b···rear convex lens / 406M···folding mirror / 1000, 2000, 3000, 4000···projection type display device

Claims

1. A plurality of semiconductor lasers of a first wavelength; a first collimating lens that collimates a plurality of laser beams outputted from the plurality of first-wavelength semiconductor lasers; a first integrator illumination system that forms a rectangular illumination area by superimposing a plurality of first-wavelength laser beams collimated by the first collimator lens; a first deflection element disposed on the first collimator lens side with respect to a position where the rectangular illumination area is formed by the first integrator illumination system; a plurality of second wavelength semiconductor lasers; a second collimating lens that collimates the laser beams output from the semiconductor lasers of the second wavelengths; a second integrator illumination system that forms a rectangular illumination area by superimposing a plurality of laser beams having a second wavelength collimated by the second collimator lens; a second deflection element disposed on the second collimator lens side with respect to a position where the rectangular illumination area is formed by the second integrator illumination system; a transfer optical system that enlarges and transfers the rectangular illumination area of ​​the first wavelength that is deflected and scanned by the first deflection element and the rectangular illumination area of ​​the second wavelength that is deflected and scanned by the second deflection element onto a reflective light modulation element; a projection lens that projects the image light output by the reflective light modulation element, Each of the first deflection element and the second deflection element includes a rotation axis and an optical surface formed along a circumference centered on the rotation axis, the optical surface is configured such that an inclination angle relative to the axis of rotation varies along the circumference; the tilt angle is configured such that continuous rotation of the optical surface about the axis of rotation at a constant speed recursively deflects the laser beam in a constant direction at a constant deflection speed; the axis of rotation of the first deflection element and the axis of rotation of the second deflection element are disposed substantially along a common axis.

1. A projection display device comprising:

2. the first deflection element and the second deflection element rotate in the same direction about their respective rotation axes; 2. The projection display device according to claim 1.

3. a light combining unit that combines the laser beam of the first wavelength deflected and scanned by the first deflection element and the laser beam of the second wavelength deflected and scanned by the second deflection element so as not to overlap each other, 2. The projection display device according to claim 1.

4. the light combining unit combines the laser beam of the first wavelength deflected and scanned by the first deflection element and the laser beam of the second wavelength deflected and scanned by the second deflection element by reflecting them an odd number of times, respectively.

4. The projection display device according to claim 3.

5. the light combining unit combines the laser beam of the first wavelength deflected and scanned by the first deflection element and the laser beam of the second wavelength deflected and scanned by the second deflection element by reflecting them zero times or an even number of times, respectively.

4. The projection display device according to claim 3.

6. a first laser module including the plurality of first-wavelength semiconductor lasers and a second laser module including the plurality of second-wavelength semiconductor lasers are arranged parallel to the common axis; 6. The projection display device according to claim 1, wherein the first and second electrodes are arranged in a first direction.

7. a cooling mechanism for cooling the first laser module and the second laser module is disposed parallel to the common axis; 7. The projection display device according to claim 6.

8. the cooling mechanism is an air-cooling mechanism that cools the first laser module and the second laser module by airflow; 8. The projection display device according to claim 7.

9. the cooling mechanism is a liquid cooling mechanism that cools the first laser module and the second laser module by a circulating liquid; 8. The projection display device according to claim 7.

10. the first integrator illumination system includes a first rod, a first condensing lens that condenses the plurality of laser beams having the first wavelength collimated by the first collimating lens toward the first rod, a first diffusing element that is disposed in the vicinity of an entrance surface of the first rod, and a first relay lens that transfers an image of an exit surface of the first rod; the second integrator illumination system includes a second rod, a second condenser lens that condenses the plurality of laser beams of the second wavelength collimated by the second collimator lens toward the second rod, a second diffusing element disposed in the vicinity of an entrance surface of the second rod, and a second relay lens that transfers an image of an exit surface of the second rod.

6. The projection display device according to claim 1, wherein the first and second electrodes are arranged in a first direction.

Images