Projection type display apparatus

Abstract

To realize a compact apparatus with high brightness in a field of a projection type image display apparatus that modulates and projects laser light in accordance with an image signal.SOLUTION: A projection type display apparatus comprises 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 deflection-scanned by the first deflection element and the laser beam deflection-scanned by the second deflection element to a reflective light modulation element. Each of the first deflection element and the second deflection element is rotatable about a rotation axis, and an optical surface formed along a circumference is configured such that an inclination angle with respect to the rotation axis changes along the circumference. The inclination angle is configured such that, when the optical surface is continuously rotated at a fixed speed, the laser beam is recursively deflected in a fixed direction at a fixed deflection speed. The rotation axis of the first deflection element and the rotation axis of the second deflection element are arranged along a common axis line.SELECTED DRAWING: Figure 1

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 display devices using laser light have been known for some time.

[0003] Patent Document 1 discloses a projection display device that includes a laser light source, an optical acoustic modulator that optically modulates the laser light in accordance with 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] Japanese Patent Application Laid-Open No. 2000-180759 [Patent Document 2] Japanese Patent Application Publication No. 2023-143587 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, but because it optically scans both horizontally and vertically, a large optical path space is required, which poses a problem of the device becoming larger.

[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 part, the efficiency of brightness relative to input power is not necessarily high in some cases. Therefore, in the field of projection type image display devices that modulate and project laser light in accordance with image signals, there has been a desire to realize a compact, high-brightness device. [Means for solving the problem]

[0008] One aspect of the present invention is an illumination system including a plurality of semiconductor lasers of a first wavelength, a first collimating lens that collimates the plurality of laser beams output by the plurality of semiconductor lasers of the first wavelength, a first integrator illumination system that forms a rectangular illumination area by superimposing the plurality of laser beams of the first wavelength collimated by the first collimating lens, a first deflection element that is arranged on the first collimating lens side with respect to a position where the rectangular illumination area is formed by the first integrator illumination system, a plurality of semiconductor lasers of a second wavelength, a second collimating lens that collimates the plurality of laser beams output by the plurality of semiconductor lasers of the second wavelength, a second integrator illumination system that forms a rectangular illumination area by superimposing the plurality of laser beams of the second wavelength collimated by the second collimating lens, and a first deflection element that is arranged on the first collimating 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 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 onto a reflective light modulation 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. [Effects of the Invention]

[0009] According to the present invention, it is possible to realize a small-sized, high-brightness device in the field of projection-type image display devices that modulate and project laser light in accordance with image signals. [Brief explanation 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. [Figure 2] (a) A schematic diagram showing one pair of a semiconductor laser and a collimating lens included in a laser module LM. (b) A schematic diagram showing a laser module LM in which pairs of semiconductor lasers 11 and collimating lenses 102 are arranged in a 4 × 2 array. [Figure 3] 1A and 1B are diagrams illustrating the near-field pattern and the far-field pattern of the output light of the semiconductor laser 11, respectively; [Figure 4] (a) Diagram showing beam spread in the parallel direction. (b) Diagram showing beam spread in the orthogonal direction. [Figure 5] FIG. 2 is a diagram for explaining an integrator illumination system. [Figure 6] (a) A view of the integrator illumination system INT from one direction, (b) A view of the integrator illumination system INT from a direction perpendicular to (a), and (c) A diagram showing a rectangular illumination area IM1. [Figure 7] (a) Schematic of a bulk rod used in an integrator illumination system. (b) Schematic of a hollow rod used in an integrator illumination system. [Figure 8] 1A is a perspective view showing the appearance of an example of a deflector, and FIG. 1B is a side view of the deflector. [Figure 9] 1A is a cross-sectional view illustrating the position and tilt angle of the reflecting surface of the deflector, and FIG. 1B is a graph illustrating the position and tilt angle of the reflecting surface of the deflector. [Figure 10] (a) A diagram showing the positional relationship between the deflector and the rectangular irradiation area IM1. (b) 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 how the screen of the reflective light modulation element 340 is irradiated with each of the rectangular B beam, G beam, and R beam, with the horizontal axis being the time axis. [Figure 12] FIG. 10 is a diagram showing a schematic configuration of an optical system of a projection display device according to a second embodiment. [Figure 13] FIG. 10 is a diagram showing a schematic configuration of an optical system of a projection display device according to a third embodiment. [Figure 14] FIG. 10 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 INVENTION

[0011] A projection display device according to an embodiment of the present invention will be described with reference to the drawings. The following embodiments are merely illustrative, and those skilled in the art can appropriately modify the detailed configurations without departing from the spirit of the present invention. In the drawings referred to in the following description, elements designated by the same reference numerals have similar functions unless otherwise noted. Optical elements in the drawings are shown schematically, and therefore may not faithfully represent their actual shapes or 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 term "X plus direction" is used, it refers to the same direction as the X-axis arrow in the coordinate system shown, and when the term "X minus direction" is used, it refers to the direction 180 degrees opposite to the X-axis arrow in the coordinate system shown. Also, when the term "X direction" is simply used, it refers to the direction parallel to the X-axis, regardless of whether it is in 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 specifying the color may be added, for example, B light source 100B, B deflector 210B, etc. On the other hand, when describing matters common to optical elements provided for each color, they may be referred to generically without distinguishing between colors, for example, light source 100, deflector 210, etc.

[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 optionally include a projection screen 190.

[0016] A front-side transfer lens 201 is disposed between the deflector 210 for each color and the light combining unit 220 , and a rear-side 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. 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 property of reflecting R light and transmitting G light and B light. The dichroic mirror 222 has the optical property of reflecting G light and transmitting B light. The dichroic mirror 223 has the optical property of reflecting B light.

[0020] The optical elements are arranged on the dichroic mirror 222 so that the optical axis centers of the front transfer lenses 201 for B light and the front transfer lenses 201 for G light overlap. Furthermore, the optical elements are arranged on the dichroic mirror 221 so that the optical axis centers of the front transfer lenses 201 for B light, the front transfer lenses 201 for G light, and the front transfer lenses 201 for R light overlap.

[0021] The light combining unit 220 aligns the traveling directions of the B light (dotted line), G light (solid line), and R light (dashed dotted line) in the positive X 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 negative Z 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, causing it to be 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, which is an array of micromirror devices. The micromirrors corresponding to each display pixel are driven so that their reflection direction is changed by pulse width modulation in accordance with the brightness 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] Pixels in the screen area illuminated with B light are driven in accordance with the luminance level of the B component of the video signal, and reflect the B image light toward TIR prism 350 at a predetermined angle. Similarly, pixels in the screen area illuminated with G light are driven in accordance with the luminance level of the G component of the video signal, and reflect the G image light toward TIR prism 350 at a predetermined angle. Furthermore, pixels in the screen area illuminated with R light are driven in accordance with the luminance level of the R component of the video signal, and reflect the R image light toward 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 B deflector 210B, G deflector 210G, and R deflector 210R.

[0025] The image light (B image light, G image light, R image light) passes through the TIR prism 350 and is guided to the projection lens 360, where it is projected as a color image. The projection lens 360 is made up 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 display device. It is also often installed in front-projection displays, but it is not necessarily required if the user wants to project onto a wall or other surface.

[0027] [light source] The B light source 100B, G light source 100G, and R light source 100R will now be described. The B light source 100B includes a laser module LM-B that includes a semiconductor laser that emits B light and a collimating lens, the G light source 100G includes a laser module LM-G that includes a semiconductor that emits G light and a laser collimating lens, and the R light source 100R includes a laser module LM-R that includes a semiconductor laser that emits R light and a collimating lens. Apart from the emission wavelength of the semiconductor laser, the light sources of each color have the same basic configuration, so below they may be simply referred to as light source 100 without distinguishing between different colors of light. The light source 100 for 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-dimensional or two-dimensional array.

[0029] Figure 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 the semiconductor laser, and 12 denotes the light-emitting portion of the semiconductor laser 11. Note that Figure 2(a) shows the orientation of the XYZ coordinate system in accordance with the arrangement shown in Figure 1. In Figure 2(a), the longitudinal direction H of the light-emitting portion 12 is parallel to the Y direction, and the traveling direction of 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 the semiconductor chip constituting the semiconductor laser 11. As shown in FIG. 2(a), in the following description, the direction parallel to the longitudinal direction H of the light-emitting section 12 of the semiconductor laser 11 may be referred to as the "parallel direction" or the slow axis, and the direction perpendicular to the longitudinal direction of the light-emitting section 12 may be referred to as the "orthogonal direction" or the fast axis. Linearly polarized light is emitted from the semiconductor laser 11, and the vibration direction of its 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 Figure 3(a), the near-field pattern shows a beam profile that reflects the shape (longitudinal and lateral dimensions) of the light-emitting section. On the other hand, as the beam travels, it spreads, as shown in the far-field pattern in Figure 3(b). That is, in the parallel direction, the beam emitted from the semiconductor laser 11 has a small spread and travels with a uniform intensity distribution within a narrow angular range. On the other hand, 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 over a wider angular range than in the parallel direction. This is because the active layer of the semiconductor laser is significantly affected by diffraction when it is emitted, due to its small thickness in the perpendicular direction. The parallel direction, where the spread is small in the far-field pattern, can also be called the slow axis, and the perpendicular direction, where the spread is large, can also 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, light emitted from the light-emitting unit 12, whose longitudinal length is Hy1, is collimated by the collimating lens 102 to form a beam having an elliptical cross section that 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 (transverse direction of the light-emitting section). The difference in the spread of the beam after passing through the collimator lens 102 will be explained 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 Figure 4(a), in the parallel direction, the peak of the beam intensity is flat, but the beam diameter widens as it progresses in the Z direction, so the divergence cannot be said to be good. In contrast, as shown in Figure 4(b), in the orthogonal direction, it can be seen that the change in the beam intensity distribution and beam diameter is small even when 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 the divergence is good.

[0036] As will be described later, in the present invention, the beam output from the light source 100 has excellent divergence (high parallelism of the beam) in the orthogonal direction (short direction of the rectangle), and by utilizing this property, 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 with excellent divergence is advantageous in preventing overlapping of the illumination areas of the B, G, and R colors 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. Furthermore, each semiconductor laser is arranged so that the longitudinal direction of the light-emitting section 12 is aligned along the Y direction. While 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 have multiple semiconductor lasers arranged in one row or three or more rows along the Y direction. Even in a light source 100 having one or three or more rows of semiconductor laser elements aligned 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 superposition means) The light source 100 of this embodiment includes an integrator illumination system INT for forming a rectangular illumination area by superimposing 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 illustrating an integrator illumination system equipped with a rod integrator. The integrator illumination system according to this embodiment includes the above-described laser module LM, condenser lens 401, diffusion element 402, rod 403, and relay lens 406, and forms a rectangular irradiation area IM1 (rectangular illumination area). The semiconductor laser, light-emitting unit 12 of the semiconductor laser, collimator lens 102, and other components 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 a single convex lens, but it may be composed of multiple lenses for the purpose of suppressing aberrations, 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 shorter direction of the rectangle than in the longer direction, so it is possible to suppress light intake loss at the incident surface INP of the rod 403 and improve utilization efficiency. The light incident on the rod 403 is repeatedly totally reflected by the side surfaces before exiting from the exit surface EXP, and by appropriately setting the diffusion ability (diffusion angle) of the diffusion element 402 and the length of the rod 403, it is possible to homogenize the illuminance distribution at the exit surface EXP.

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

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

[0045] The rod 403 may be any optical element that can totally reflect incident light from its side surfaces, such as the one shown in Fig. 7(a) or Fig. 7(b). 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 translucent resin, and the end faces, the incident surface INP and the exit surface 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 incident surface INP and the exit surface EXP.

[0047] 7(b) is a hollow rectangular prism, i.e., a cylindrical element, with a reflective surface made of, for example, aluminum 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 long sides H0 and short sides V0. For example, the element can be manufactured relatively inexpensively by depositing a reflective film such as an aluminum film on glass or metal plate-shaped substrates, and then assembling the substrates into a cylindrical shape.

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

[0049] In addition, the rod 403 has been given as an example of 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 configuration using a rod integrator, and may be, for example, a configuration in which a pair of a first microlens array and a second microlens array are 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 form images at the spherical positions of each other. In this way, an integrator illumination system INT can be configured in which the laser beams emitted from each semiconductor laser are superimposed.

[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 array spacing can be set regardless of the stripe pitch, which makes it possible to suppress unstable capture due to an insufficient number of array divisions and makes it easier to generate a thinner and more uniform rectangular spot.

[0052] Alternatively, a diffractive diffusion element (a so-called top hat element) may be used 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 elements; a single element can also be used.

[0053] (deflector) As shown in Fig. 1, deflectors (B deflector 210B, G deflector 210G, R deflector 210R) are arranged between light sources 100 (B light source 100B, G light source 100G, R light source 100R) and the rectangular irradiation areas IM1 (rectangular illumination areas) 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 because 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 a deflector 210, and FIG. 8(b) is a side view of the deflector 210. The deflector 210 includes a rotatable disk-shaped substrate 211 and a motor 212 that rotates the substrate 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 substrate 211 along the circumference. To identify the position of the reflecting surface, angular coordinates are set counterclockwise around the rotation axis AX as shown in FIG. 8(a) (0°, 90°, 180°, and 270° are shown in the figure). An axis BX shown in the figure is an axis that is parallel to the rotation axis AX and passes through the reflecting surface 213. A beam irradiation position 214 is shown as 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 explained 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 angular coordinates explained in Figure 8(a). Furthermore, the inclination angle of the reflecting surface is 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 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 position of the reflecting surface is 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 coordinate of the part irradiated with the laser beam at the beam irradiation position 214 shown in Figure 8(a) changes continuously as follows: 0° → 90° → 180° → 360° (= 0°) → 90°...

[0058] Even if the reflecting surface rotates and the portion of the reflecting surface irradiated with the laser beam changes, the incident beam always strikes the reflecting surface 213 at an angle of α with respect to the axis BX, as shown in Figure 9(a). Meanwhile, the inclination angle of the reflecting surface varies within the range of -θ to +θ depending on the position of the reflecting surface. Therefore, as shown in Figure 9(a), the direction of the laser beam reflected by the reflecting surface 213 varies within an angle range of 4θ, from (α-2×θ) to (α+2×θ), with the axis BX as the reference. 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 output beam within an angular 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 output beam is continuously deflected (scanned) from RD1 to RD2 in FIG. 8(b), and upon reaching RD2, it instantly returns to RD1 and is deflected (scanned) toward RD2 again. On the other hand, if the reflecting surface 213 is rotated in the opposite direction to the R direction, the output beam is continuously deflected (scanned) from RD2 to RD1 in FIG. 8(b), and upon reaching RD1, it instantly returns to RD2 and is deflected (scanned) toward RD1 again.

[0060] In this way, the deflector 210 can recursively deflect and scan the laser beam in a predetermined direction at a constant speed using a simple driving method of continuously rotating the rotor at a constant speed. As will be described later, 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), the illumination light can be scanned in the V direction on the screen of 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) relative 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 in accordance with the rotation of the deflector 210.

[0062] Regarding the manufacturing method of the deflector 210, the disk-shaped base 211 having the band-shaped reflecting surface 213 provided along its circumference can be manufactured at low cost by, for example, processing a metal base material using a press extrusion method. As illustrated in FIG. 9( a), protruding and recessed portions from the main surface of the base 211 exist near the reflecting surface 213. To achieve good rotational balance, however, it is desirable to design the base 211 so that the cross-sectional area is uniform regardless of the position of the cross section when viewed in a cross section passing through the rotation axis AX. Furthermore, to reduce wind noise, the maximum protruding height and maximum recessed depth of the base 211 from the main surface are desirably 3 / 4 or less of the average plate thickness. Specifically, the average plate thickness of the base 211 is desirably 0.7 mm to 2 mm, and θ is desirably 3° to 6°.

[0063] By the deflector described above, 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 division) The laser beams of each color deflected and scanned by the deflectors of each color are aligned in the same 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 functions 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 caused 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. 1. The transfer magnification for enlarging the rectangular irradiation area IM1 into the rectangular secondary transfer image IM2 is, for example, approximately 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', which 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, relative to the scanning range in which the rectangular irradiation area IM1 is scanned by the deflector 210.

[0068] 11(c) is a diagram showing the irradiation of rectangular B, G, and R beams onto the screen of the reflective light modulation element 340, with the horizontal axis representing time. The B, G, and R beams vertically scan the screen of the reflective light modulation element 340 along the scanning direction SD, completing scanning of one screen in one frame time. To prevent color mixing at the boundaries of each color area, the B, G, and R beams are configured so that they do not overlap with each other, and as a result, the vertical width V2 of each beam is 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 lighting system, and a deflection element, each for a different color of light, and is equipped with a light combining section that combines the lighting light output by the lighting units of different color lights, and the rectangular lighting areas output by each of the lighting units of different color lights are deflected and scanned so as not to overlap each other, and are then enlarged and transferred onto a reflective light modulation element.

[0070] (Characteristic configuration of this embodiment) 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 one another, excluding unavoidable 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, excluding unavoidable 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, excluding unavoidable manufacturing errors.

[0071] According to this embodiment, light source 100R, light source 100G, and light source 100B of each color, which are configured with the same optical layout, are shifted relative to each other in the X and Z directions within the XZ plane and arranged in the same orientation. As a result, the optical path spaces of the three color laser beams are compact as a whole, and it is possible to configure projection-type display device 1000 in an extremely small size.

[0072] Furthermore, in conventional devices, particularly when performing high-brightness display, heat generation can cause the laser module to become hot, reducing the light-emitting efficiency of the semiconductor laser and resulting in problems. In this regard, according to this embodiment, the laser modules LM-R, LM-G, and LM-B are arranged parallel to the common axis CW, and the air-cooling mechanism (not shown) is configured to allow the cooling air to flow along the laser modules arranged parallel to the common axis CW. In other words, by arranging the blower and the flow path defining member so that the cooling air flows along the laser modules arranged parallel to the common axis CW, a compact and highly efficient cooling system can be used to suppress temperature increases in the laser modules.

[0073] According to this embodiment, in the field of projection type image display devices that modulate and project laser light in accordance with 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, the diagram omits mechanical mechanisms for installing optical elements, electrical wiring, and the like, and reference numerals are omitted for elements common to Fig. 1 of embodiment 1. Explanations of matters common to embodiment 1 in 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 consisting of a front transfer lens 201 and a rear transfer lens 202, a light combining unit 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 modules LM, piping 502 for circulating liquid between the liquid cooling unit 501 and a radiator 503, the radiator 503 for dissipating heat from the laser modules 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 liquid used to cool the laser modules LM include water and oil, but other liquids may also be used. The liquid may be allowed to circulate naturally due to a temperature gradient that occurs, or a pump (not shown) may be provided to forcibly circulate the liquid through the circulation path.

[0077] 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 one another, excluding unavoidable 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, excluding unavoidable 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, excluding unavoidable manufacturing errors.

[0078] According to this embodiment, light source 100R, light source 100G, and light source 100B of each color, which are configured with the same optical layout, are shifted relative to each other in the X direction and the Z direction and arranged in the same direction. As a result, the optical path spaces of the three color laser beams are made compact as a whole, and it is possible to make projection-type display device 2000 extremely small.

[0079] Furthermore, in conventional devices, particularly when performing high-brightness display, heat generation can cause the laser module to become hot, reducing the light-emitting efficiency of the semiconductor laser and resulting in problems. In contrast, according to this embodiment, the laser modules LM-R, LM-G, and LM-B are arranged parallel to the common axis CW. Therefore, for the liquid cooling mechanism, it is sufficient to arrange the piping and radiator of the flow path so that the cooling liquid flows along the liquid cooling unit arranged parallel to the common axis CW, and a compact and highly efficient cooling system can suppress temperature increases in the laser module.

[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, the diagram omits mechanical mechanisms for installing optical elements, electrical wiring, etc. 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 consisting 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, and dichroic mirror 223) with different optical properties are used to configure the light combining unit 220. In contrast, in the present embodiment, four dichroic mirrors are used to configure the light combining unit.

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

[0084] In this way, the light combining unit of this embodiment is configured so that each laser beam of any color is reflected an odd number of times by the dichroic mirror and combined. 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, making it easy to control the driving of the deflectors.

[0085] 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 one another, excluding unavoidable 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, excluding unavoidable 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, excluding unavoidable manufacturing errors.

[0086] According to this embodiment, light source 100R, light source 100G, and light source 100B of each color, which are configured with the same optical layout, are shifted relative to each other in the X direction and the Z direction and arranged in the same direction. As a result, the optical path spaces of the three color laser beams are compact as a whole, and it is possible to make projection-type display device 3000 extremely small.

[0087] Furthermore, in conventional devices, particularly when performing high-brightness display, heat generation can cause the laser module to become hot, reducing the light-emitting efficiency of the semiconductor laser and resulting in problems. In contrast, according to this embodiment, the laser modules LM-R, LM-G, and LM-B are arranged parallel to the common axis CW. Therefore, for an air-cooled cooling mechanism (not shown), an airflow flow path regulating member or a fan can be arranged so that cooling air flows along the laser modules arranged parallel to the common axis CW, thereby suppressing temperature rise in the laser modules with a compact and highly efficient cooling system. Alternatively, when a liquid-cooled cooling mechanism is provided as in embodiment 2, flow path piping and a radiator can be arranged so that cooling liquid flows along a liquid-cooled unit arranged parallel to the common axis CW, thereby suppressing temperature rise in the laser modules 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, the diagram omits mechanical mechanisms for installing optical elements, electrical wiring, etc. 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 consisting 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) with different optical properties are used to configure the light combining unit 220. In the present embodiment, the light combining unit is configured using dichroic mirror 221C with optical properties different from those of dichroic mirror 221, dichroic mirror 222, and dichroic mirror 223.

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

[0092] In this way, the light combining unit of this embodiment is configured so that the laser beam of each color is reflected zero 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, making it easy to control the driving of the deflectors.

[0093] 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 one another, excluding unavoidable 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, excluding unavoidable 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, excluding unavoidable 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 relative to each other in the X and Z directions and arranged in the same direction. This makes it possible to compactly arrange the optical path spaces of the three color laser beams as a whole, making it possible to make the projection display device 4000 extremely compact. In particular, compared to the embodiments shown in FIGS. 1 and 13, the configuration illustrated in FIG. 14 can make the device size in the X direction more compact.

[0095] Furthermore, in conventional devices, particularly when performing high-brightness display, heat generation can cause the laser module to become hot, reducing the light-emitting efficiency of the semiconductor laser and resulting in problems. In contrast, according to this embodiment, the laser modules LM-R, LM-G, and LM-B are arranged parallel to the common axis CW. Therefore, for an air-cooled cooling mechanism (not shown), an airflow flow path regulating member or a fan can be arranged so that cooling air flows along the laser modules arranged parallel to the common axis CW, thereby suppressing temperature rise in the laser modules with a compact and highly efficient cooling system. Alternatively, when a liquid-cooled cooling mechanism is provided as in embodiment 2, flow path piping and a radiator can be arranged so that cooling liquid flows along a liquid-cooled unit arranged parallel to the common axis CW, thereby suppressing temperature rise in the laser modules 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 it is telecentric on both sides, but other configurations are also possible. For example, one or more of these transfer optical systems may be a so-called anamorphic optical system (anamorphic lens) that has different optical characteristics at two cross sections around the optical axis. By using an anamorphic transfer optical system, the magnification can be reduced or increased in only one direction, making it possible to adjust the NA and the aspect ratio of the transferred image, thereby further improving 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, or 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 equipped with three laser light sources of B, G, and R has been described as an example, but the present invention is not limited to this example and can be applied to a projection display device equipped with multiple 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 arranging light sources of each color configured with the same optical layout in the same direction but shifted relative to each other in the X and Z directions within the XZ plane, the optical path space of the multiple color laser light can be made compact as a whole, making it possible to configure an extremely small projection display device.

[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 laser beams having a first wavelength 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 plurality of laser beams output from the plurality of second-wavelength semiconductor lasers; a second integrator illumination system that forms a rectangular illumination area by superimposing the plurality of laser beams having the 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 from 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 rotation axis of the first deflection element and the rotation axis of the second deflection element are arranged substantially along a common axis. A projection display device characterized by: [Matter 2] the first deflection element and the second deflection element rotate in the same direction around 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 that they do not overlap with 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 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 semiconductor lasers of the first wavelength and a second laser module including the plurality of semiconductor lasers of the second wavelength are arranged parallel to the common axis; 6. The projection display device according to any one of items 1 to 5, characterized in that: [Matter 7] a cooling mechanism for cooling the first laser module and the second laser module is arranged 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 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 diffusing element disposed near an incident 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, characterized in that: [Explanation of symbols]

[0101] 11···Semiconductor laser / 12···Light emitting unit / 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···Rear 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 unit / 221, 222, 223···Dichroic mirror / 330···Optical 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···Back 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 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 laser beams of the first wavelength 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 plurality of laser beams output from the plurality of second-wavelength semiconductor lasers; a second integrator illumination system that forms a rectangular illumination area by superimposing the plurality of laser beams having the 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 from 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 rotation axis of the first deflection element and the rotation axis of the second deflection element are arranged substantially along a common axis. A projection display device characterized by:

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 that they do not overlap with 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 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 semiconductor lasers of the first wavelength and a second laser module including the plurality of semiconductor lasers of the second wavelength are arranged parallel to the common axis; 6. The projection display device according to claim 1, wherein the first and second projection lenses are arranged parallel to each other.

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, wherein the projection display device is a projection type display device.

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 circulating liquid; 8. The projection display device according to claim 7,

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 incident surface of the rod, and a relay lens that transfers an image of an exit surface of the rod; 6. The projection display device according to claim 1, wherein the first and second projection lenses are arranged parallel to each other.

Images