Light source device and projection device

Abstract

The light source device includes: a light emitting device provided with a plurality of semiconductor light emitting elements; and a microlens array, the light emitting device being configured so that the light from the light emitting device is shifted and irradiated to the microlens array, and being configured so that the light emitted from the microlens array is not irradiated to an invalid area of a projection optical system.

Description

Technical Field

[0001] The technical field of the present invention relates to a light source device and a projection device. Background Art

[0002] In the past, a light source device and a projection device using a light emitting device have been disclosed, wherein the light emitting device is a multi-chip package structure including a plurality of semiconductor light emitting elements such as laser diodes, and these plurality of semiconductor light emitting elements are arranged on the same substrate. For example, Japanese Patent Publication No. 2023-154401 discloses a projection device, which includes a light source module as a light emitting device and a light source device including a microlens array. The light from the light source module is irradiated to the microlens array. The light irradiated to the microlens array is emitted as homogenized light and irradiated to a display element such as a DMD (Digital Micromirror Device) via other optical elements. When the light is irradiated to the display element, image light is generated by the display element, and the projection image is projected via a projection lens as a projection optical system. Summary of the Invention

[0003] The light source device disclosed herein comprises: a light emitting device provided with a plurality of semiconductor light emitting elements; and a microlens array, wherein the light emitting device is configured so that light from the light emitting device is deflected and irradiated onto the microlens array, and is configured so that light emitted from the microlens array does not irradiate an ineffective area of ​​a projection optical system.

[0004] The projection device of the present invention includes: the above-mentioned light source device; a display element that is irradiated with light from the microlens array and generates image light; and a projection optical system that projects the image light emitted from the display element. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 It is a diagram showing a functional circuit block of a projection device according to an embodiment of the present invention.

[0006] Figure 2 It is a schematic plan view showing the internal structure of the projection device according to the embodiment of the present invention.

[0007] Figure 3 This is a schematic front view of a light emitting device of a light source device according to an embodiment of the present invention as viewed from the emission side.

[0008] Figure 4 The schematic diagram showing the positional relationship between the microlens array and the light emitting device of the light source device according to the embodiment of the present invention is viewed from the side opposite to the light emitting side of the light emitting device. In addition, only a portion of the multiple microlenses in the microlens array are shown.

[0009] Figure 5 This diagram shows how light from the light emitting device enters the projection optical system via the microlens array and display element. It illustrates how light from the light emitting device is incident on the microlens array without any deviation. In this diagram, light enters the microlens array from the back side of the paper.

[0010] Figure 6 This is a schematic diagram showing how light from a light emitting device according to an embodiment of the present invention enters a projection optical system via a microlens array and a display element. This diagram illustrates how light from the light emitting device is incident on the microlens array with an offset relative to the microlens array. In this diagram, light is shown entering the microlens array from the back side of the paper.

[0011] Figure 7 It is a schematic plan view showing the internal structure of the main part of a projection device according to a modified example of the embodiment of the present invention.

[0012] Figure 8 This is a schematic diagram showing the internal structure of the main part of a projection device according to another embodiment of the present invention as viewed from the side.

[0013] Figure 9 The microlens array, display element, prism and projection optical system showing the internal structure of the main parts of the projection device of another embodiment of the present invention are relative to each other. Figure 8 , which is a schematic diagram showing the positional relationship of the light emitting device as viewed from the side opposite to the emitting side. DETAILED DESCRIPTION

[0014] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Figure 1 This is a functional circuit block diagram of the projection device 10. The projection device control unit is composed of a CPU including the image conversion unit 23 and the control unit 38, a front-end unit including the input / output interface 22, a display encoder 24, and a display driver 26. Image signals of various standards input from the input / output connector 21 are converted by the image conversion unit 23 via the input / output interface 22 and the system bus SB to form image signals in a predetermined format suitable for display. The signals are then output to the display encoder 24.

[0015] Furthermore, the display encoder 24 expands the input image signal and stores it in the video RAM 25 , and then generates a video signal based on the storage content of the video RAM 25 , and outputs it to the display driver 26 .

[0016] The display driver 26 drives the display element 50 such as a DMD as a spatial light modulator (SOM) at an appropriate frame rate in response to the image signal output from the display encoder 24. The projection device 10 irradiates the display device 50 with a light beam emitted from the light source device 60, thereby generating image light on the image forming surface of the display device 50 and transmitting the image light to the projection optical system 220 (see FIG. Figure 2 ) The projection image is projected onto a projection object such as a screen (not shown). In addition, the movable lens group 235 of the projection optical system 220 can be driven by a lens motor 45 for zoom adjustment and focus adjustment.

[0017] The image compression / decompression unit 31 also performs recording processing, compressing the luminance signal and color difference signal of an image signal through processes such as ADCT and Huffman coding, and sequentially writing the data to a removable recording medium, a memory card 32. Furthermore, in playback mode, the image compression / decompression unit 31 reads the image data recorded on the memory card 32, decompresses each frame of image data constituting a series of moving images, and outputs the decompressed data to the display encoder 24 via the image conversion unit 23. Thus, the image compression / decompression unit 31 can output moving images, etc., based on the image data stored on the memory card 32.

[0018] The control unit 38 is responsible for controlling the operation of each circuit in the projection device 10 and is composed of a CPU, a ROM that permanently stores operation programs for various settings, and a RAM used as a work memory.

[0019] The key / indicator unit 37 is composed of a main key and an indicator provided in the housing. Operation signals from the key / indicator unit 37 are directly transmitted to the control unit 38. Furthermore, key operation signals from the remote control are received by the Ir receiver 35, demodulated into a coded signal by the Ir processor 36, and output to the control unit 38.

[0020] The control unit 38 is connected to the audio processing unit 47 via the system bus SB. The audio processing unit 47 includes a sound source circuit such as a PCM sound source, and converts audio data into analog form in the projection mode and the playback mode, and drives the speaker 48 to amplify the sound.

[0021] The control unit 38 controls a light source control device including a light source control circuit 41. The light source control device including the light source control circuit 41 controls the light source device 60 in a time-sharing manner so that the light source device 60 emits light of a predetermined wavelength band required for image generation.

[0022] Furthermore, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided on the light source device 60 and the like, and controls the rotation speed of the cooling fan 261 based on the temperature detection results. Furthermore, the control unit 38 uses a timer or the like to cause the cooling fan drive control circuit 43 to continue rotating the cooling fan 261 even after the power to the main body of the projection device 10 is turned off, or to perform other controls such as turning off the power to the main body of the projection device 10 based on the temperature detection results using the temperature sensors.

[0023] Next, explain Figure 2 The internal structure of the projection device 10 is shown. The projection device 10 has a generally box-shaped housing and includes an upper panel and a lower panel (not shown), a front panel 12, a rear panel 13, a right side panel 14, and a left side panel 15. The projection device 10 also has a projection port 12a on the front side. In the following description, "left and right" in the projection device 10 refers to the left-right direction relative to the projection direction from the projection port 12a, and "front and back" refers to the front-back direction relative to the projection object of the projection device 10 and the direction of travel of the light beam.

[0024] The projection device 10 includes a control circuit board 242 near the left side panel 15. The control circuit board 242 includes a power supply circuit block, a light source control block, and the like. Furthermore, the projection device 10 includes a light source device 60 disposed approximately in the center of the projection device 10. A power connector 57, a heat sink 130, and a cooling fan 261 are disposed between the light source device 60 and the right side panel 14. Furthermore, a display element 50 is disposed on the left side of the light source device 60. The display element 50 is connected to a heat sink 190.

[0025] The light source device 60 includes a light emitting device 70, a light source optical system 140, and a light guide optical system 170. Light emitted from the light emitting device 70 enters the light guide optical system 170 via the light source optical system 140. The light guide optical system 170 guides the light from the light source optical system 140 to the display element 50.

[0026] The light emitting device 70 is provided in the approximate center of the housing of the projection device 10 and is configured to emit light slightly forward to the left. Figure 3 As shown, the light emitting device 70 is provided with a light source package 75 including a plurality of laser diodes as semiconductor light emitting elements on a substrate 71 serving as a base member. The light source package 75 is composed of a multi-chip package (MCP) structure that encapsulates the laser diodes and a collimating lens for collimating the laser light. Figure 3In the embodiment, the four light source packages 75 on the upper side are red light source packages 72 that emit light in the red wavelength band. Specifically, the chips of the laser diodes that emit light in the red wavelength band are arranged in four lateral directions on the substrate 71. Figure 3 In the figure, among the five light source packages 75 on the lower side, the two light source packages 75 on the left are blue light source packages 73 that emit light in the blue wavelength band. Specifically, the chips of the laser diodes that emit light in the blue wavelength band are arranged in two lateral directions on the substrate 71. Figure 3 In the figure, among the five light source packages 75 on the lower side, the three light source packages 75 on the right side are green light source packages 74 that emit light in the green wavelength band. Specifically, the chips of the laser diodes that emit light in the green wavelength band are arranged in three lateral directions on the substrate 71. As described above, the multi-chip package structure in this embodiment is as follows: Figure 3 As shown in FIG. 1 , a plurality of semiconductor light emitting elements are arranged on a substrate 71 serving as a base member. Figure 3 The number of semiconductor light emitting elements emitting light of each color provided on the substrate 71 is arbitrary, and the semiconductor light emitting elements emitting light of each color may be arranged one by one.

[0027] like Figure 4 As shown, the light emitting device 70 is arranged at an inclination relative to the microlens array 171 described later. Here, the laser light emitted from the light source package 75 is elliptical, as shown by the light L. On the other hand, the microlens array 171 has a plurality of microlenses 171a arranged in a grid shape. Moreover, the light emitting device 70 is arranged so that the elliptical light L is inclined relative to the arrangement direction of the plurality of microlenses 171a. For example, the major axis C1 of the ellipse of the light L is arranged at an inclination angle of 0°<θ<90° with respect to the upper and lower arrangement directions D1 of the microlenses 171a arranged in a grid shape upward, downward, left and right. In the present embodiment, θ≒45°. That is, in other words, the light emitting device 70 is arranged so that the light L is inclined relative to the arrangement direction of the microlenses 171a of the microlens array 171.

[0028] return Figure 2 The light source optical system 140 includes a first condensing lens 141. The first condensing lens 141 is disposed on the optical path from the light emitting device 70 to the microlens array 171 on the emitting side of the light emitting device 70. The first condensing lens 141 may be a convex meniscus lens. Thus, the light emitting device 70 can narrow the beam width of the emitted light and irradiate the emitted light to the microlens array 171 in a state of constricting the beam. Alternatively, by configuring a concave lens 142 on the emitting side of the first condensing lens 141 and making the first condensing lens 141 a convex lens, the first condensing lens 141, which is a convex lens, and the concave lens 142 can be combined to narrow the beam width.

[0029] In addition, in the light source optical system 140, a vibrating diffuser plate 143 can be provided between the first condensing lens 141 and the microlens array 171 described later. The vibrating diffuser plate 143 includes a diffuser plate 143a and a vibrating device 143b. The vibrating device 143b is capable of imparting a reciprocating motion (i.e., vibration) of a small distance in a direction parallel to the diffusion surface of the diffuser plate 143a (i.e., a surface perpendicular to the optical axis of the diffuser plate 143a). The vibrating device 143b can adopt various actuating mechanisms, such as a ball screw mechanism in which a screw shaft is connected to a motor shaft and a nut is connected to the diffuser plate 143a, a linear guide mechanism, a mechanism using a piezoelectric element, and the like. The projection device 10 can reduce speckle noise by projecting a projection image using the light from the light emitting device 70 converted into laser light by the vibrating diffuser plate 143 as light source light.

[0030] The light-guiding optical system 170 includes a microlens array 171, a concave lens 172, a second condensing lens 173, an irradiation mirror 175, and a condenser lens 176. Light from the light-emitting device 70 is irradiated onto the microlens array 171 and enters the microlens array 171. The concave lens 172 is provided on the exit side of the microlens array 171. The microlens array 171 and the concave lens 172 are arranged in contact with each other. The second condenser lens 173 is arranged on the exit side of the concave lens 172. The irradiation mirror 175 is arranged on the exit side of the second condenser lens 173. The condenser lens 176 is arranged on the front side of the display element 50. When light from the light-emitting device 70 is irradiated onto the microlens array 171, uniform light is emitted from the microlens array 171. The light emitted from the microlens array 171 enters the concave lens 172, and the concave lens 172 widens the light beam. Light emitted from concave lens 172 is condensed by second condenser lens 173, bent by irradiation mirror 175, and irradiated onto the image forming surface of display element 50 via condenser lens 176. Thus, light from microlens array 171 irradiates display element 50, which generates image light.

[0031] The projection optical system 220 includes a movable lens group 235 and a fixed lens group 225. The fixed lens group 225, located on the optical axis of the front panel 12 side of the light condenser lens 176, is housed within a fixed lens barrel and can be manually or automatically moved to adjust zoom and focus. When light strikes the image-forming surface of the display element 50, which serves as a DMD, it displays various colors in a time-sharing manner according to the data, generating image light. The light then enters the incident surface of the projection optical system 220 from the light condenser lens 176. The image light entering the projection optical system 220 is projected from the projection port 12a toward the object being projected as a projection image.

[0032] The DMD of the display element 50 is a reflective element. Since the position space of the microlens array 171 corresponds to the angular space in the DMD, the light (light L from the light emitting device 70) incident on the microlens array 171 is different depending on the position of the monomer (microlens 175a) within the surface of the microlens array 171 that is incident, and the position within the surface of the projection optical system 220 (a virtual surface in the projection optical system. This virtual surface is called the pupil surface 220a (not shown)) is different. Here, unlike the present embodiment, Figure 5 This is an example in which the light L is incident so that the long axis direction of the elliptical light emitted from the light emitting device 70 is approximately parallel to the arrangement direction of the microlenses 171a of the microlens array 171, so that the light emitted from the light emitting device 70 is not offset relative to the microlens array 171 (in other words, the light L is not offset relative to the optical axis of the microlens array 171). Figure 4 (Example of θ = 0° shown). Figure 5 In the example shown in FIG. 1 , light emitted from the microlens array 171 is indicated by hollow arrows to represent principal rays and peripheral light beams. The principal ray La1 of light from the upper left of the microlens array 171 is at an angle indicated by the principal ray Lb1 at the lower right, directed toward the projection optical system 220 (the pupil plane 220a of the projection optical system 220). Similarly, the principal ray La2 at the upper right is at an angle indicated by the principal ray Lb2 at the lower left, the principal ray La3 at the lower left is at an angle indicated by the principal ray Lb3 at the upper right, and the principal ray La4 at the lower right is at an angle indicated by the principal ray Lb4 at the upper left. The peripheral light beams of each principal ray are then reflected by the display element 50 and taken into the projection optical system 220.

[0033] On the other hand, in the projection device 10, a shielding plate 180 and an illumination mirror 175 for shielding stray light emitted from the light emitting device 70 are provided in the optical path from the microlens array 171 to the display element 50 and around the optical path (see also FIG. Figure 2 ). The angle of the light (image light) entering the projection optical system 220 from the display element 50 is limited by the shielding plate 180 and the irradiation mirror 175, etc. In addition, in addition to the shielding plate 180 and the irradiation mirror 175, the angle of the light entering the projection optical system 220 from the display element 50 is also limited by the peripheral light ratio of the projection optical system 220. In this way, when the angle of the light entering the projection optical system 220 from the display element 50 is limited, an invalid area LS, which is an area where the light is partially not taken in, is sometimes generated inside the projection optical system 220, especially at the peripheral portion of the surface of the projection optical system 220 (the pupil surface 220a of the projection optical system 220). In Figure 5In the example, the peripheral light beams of the main light beams Lb3 and Lb4 become difficult to be captured. Figure 5 In the example, a portion of the principal light La3 emitted from the microlens array 171 is blocked by the corner portion T1 of the reflector 175. The blocked light is indicated by hatching. Figure 5 When the main ray La3 emitted from the lower left of the microlens array 171 is a blue wavelength band light, the light entering the projection optical system 220 from the display element 50 becomes the main ray Lb3. In this way, the blue wavelength band light is difficult to be taken into the projection optical system 220, so the amount of blue wavelength band light is reduced (the efficiency of light utilization is reduced), and the blue color in the projected image is uneven. In addition, a part of the main ray Lb4 emitted by the display element 50 is blocked by the T2 part of the corner part of the shielding plate 180. As with the T1 part, the situation where the light is blocked is represented by hatching. Therefore, similarly, if the main ray La4 from the microlens array 171 is a green wavelength band light, the green wavelength band light as the main ray Lb4 taken from the display element 50 to the projection optical system 220 becomes difficult to be taken in, so the efficiency of light utilization is reduced, and the green color in the projected image is uneven.

[0034] Therefore, in this embodiment, the entire light beam (light L) from the light emitting device 70 is irradiated to the microlens array 171 while being offset. Figure 6 (See also Figure 4 ), the light L irradiated to the microlens array 171 is irradiated in a tilted direction relative to the arrangement of the microlenses 171a of the microlens array 171. More specifically, as described above, the light emitting device 70 is arranged so that θ≒45° (refer to Figure 4 ).Right now, Figure 6 This embodiment is not as Figure 5 In this manner, the light L is not irradiated along the vertical direction or the horizontal direction of the microlens array 171 (for example, the arrangement direction of the microlenses 171a arranged in a grid pattern), but the light L irradiated to the microlens array 171 is irradiated with a shift toward the microlens array 171. In other words, the light L irradiated to the microlens array 171 is irradiated with a shift in the rotation direction relative to the optical axis MCL of the microlens array 171.

[0035] By deflecting the entire light beam (light L) from the light emitting device 70 toward the microlens array 171 and irradiating it, image light from the display element 50 can be captured into the projection optical system 220 in an area MS outside the ineffective area LS of the projection optical system 220. In other words, the area of ​​the microlens array 171 corresponding to the area MS outside the ineffective area LS of the projection optical system 220 (effective area P) is set based on light angle restriction factors (e.g., factors such as the shielding plate 180, the illumination mirror 175, and the ambient light intensity ratio of the projection optical system 220 that restrict the angle of light entering the projection optical system 220 from the display element 50). Light L from the light emitting device 70 is irradiated onto the effective area P of the microlens array 171. As described above, the light emitting device 70 is arranged obliquely relative to the microlens array 171 (the major axis direction of the elliptical light L is tilted relative to the arrangement direction of the microlenses 171a), so that light L is irradiated onto the effective area P of the microlens array 171. By irradiating the effective area P with light L, it is possible to reduce the loss of image light generated by irradiating the display element 50 with light of various wavelength bands and then entering the projection optical system 220. This improves light utilization efficiency and reduces color unevenness in the projected image. Next, with particular attention paid to the shielding plate 180, for example, in the projection device 10, the light source device 60 is configured so that light emitted from the display element 50 avoids the shielding plate 180 and is irradiated onto the projection optical system 220.

[0036] Furthermore, as disclosed in Japanese Patent Application Laid-Open No. 2022-49752, the microlens array 171 can be arranged to rotate about its optical axis relative to the horizontal plane of the projection device 10. Even in this case, the light emitting device 70 can be arranged so that the entire light beam (light L) is irradiated onto the microlens array 171 with a shift.

[0037] Hereinafter, variations of this embodiment and other embodiments will be described, with the same components and parts being denoted by the same reference numerals and their descriptions omitted or simplified. Figure 7As shown, as a variation of this embodiment, the light source device 60 can also be configured such that a dichroic mirror 144 is positioned at a location where the light emitted from the two light emitting devices 70A and 70B intersect. For example, red wavelength band light can be emitted from the light emitting device 70A, and blue wavelength band light and green wavelength band light can be emitted from the light emitting device 70B. In this case, the dichroic mirror 144 is configured to transmit the red wavelength band light and reflect the blue wavelength band light and the green wavelength band light. Thus, the red wavelength band light emitted from the light emitting device 70A transmits the dichroic mirror 144 and is irradiated onto the microlens array 171. The blue wavelength band light and the green wavelength band light emitted from the light emitting device 70B are reflected by the dichroic mirror 144 and are irradiated onto the microlens array 171. At least the light emitting device 70B is configured so that the entire light beams of the blue wavelength band light and the green wavelength band light emitted from the light emitting device 70B are offset from the microlens array 171.

[0038] Alternatively, it can be configured as follows: Figure 7 The light emitting device 70A (and the first condenser lens 141 and concave lens 142 corresponding to the light emitting device 70A) is replaced with the light emitting device 70B, which is configured to emit light in the red, blue, and green wavelength bands, and a reflecting mirror is provided in place of the dichroic mirror 144. In this case, the light emitting device 70B is also configured so that the entire light beam of the red, blue, and green wavelength bands emitted from the light emitting device 70B is irradiated with an offset relative to the microlens array 171.

[0039] in addition, Figure 8 and Figure 9 The projection device 300 of another embodiment shown in FIG. 1 is a liquid crystal display (LCD). Figure 8 For ease of explanation, only one display element 51, which is an LCD, is shown. In the projection device 300, light L from the light emitting device 70 is irradiated onto the microlens array 171 of the light guide optical system 170 via the light source optical system 140. Light L emitted from the microlens array 171 is irradiated onto the display element 51. The irradiated light L is emitted from the display element 51 as image light LA ​​and then taken into the projection optical system 220 via the prism 181. Projection light LB is emitted from the projection port 12a of the projection optical system 220, and the projection image is projected onto the screen 310.

[0040] Here, the effective area P is set in the microlens array 171 by the light angle limiting factor. For example, sometimes, in the LCD projection device 300, the display element 51 and the optical axis of the projection optical system 220 are shifted so that the projected image is formed above the optical axis 220C of the projection optical system 220. That is, in this embodiment, the light angle limiting factor is the configuration of the display element 51 and the projection optical system 220. Assume that when light is irradiated onto the top of the microlens array 171, as shown by the light LE (indicated by the dotted arrow), it becomes light at an angle that is not taken in by the projection optical system 220. Therefore, also refer to Figure 9 In the projection device 300, the area below the microlens array 171 is set as the effective area P. Then, light L from the light emitting device 70 is irradiated onto the effective area P (in other words, the entire light beam (light L) from the light emitting device 70 is irradiated onto the microlens array 171 with an offset, or the entire light beam (light L) from the light emitting device 70 is irradiated downward from the optical axis MCL of the microlens array 171). As a result, light primarily consisting of a light beam at an angle indicated by the light L emitted from the microlens array 171 is irradiated onto the display element 51. This reduces the loss of light from the light emitting device 70 entering the projection optical system 220, improves light utilization efficiency, and reduces color unevenness in the projected image.

[0041] As described above, according to an embodiment of the present invention, the light source device 60 includes a light emitting device 70 provided with a light source package 75 including a plurality of semiconductor light emitting elements, and a microlens array 171. The light emitting device 70 is configured so that light from the light emitting device 70 is irradiated onto the microlens array 171 in an offset manner, and light emitted from the microlens array 171 does not irradiate the ineffective area LS of the projection optical system 220.

[0042] Thus, since the light source light can be emitted from the microlens array 171, the angle of the light rays entering the projection optical system 220 from the display element 50 is within a region that avoids the ineffective region LS. Therefore, even in a light source device 60 that uses a compact light emitting device 70 comprising multiple semiconductor light emitting elements (light source package 75) with different wavelength bands, light utilization efficiency can be improved. Furthermore, the present invention can be implemented as long as the light emitting device 70 is configured to emit a single color or two or more colors of light. Furthermore, as shown in this embodiment, if the multiple semiconductor light emitting elements in the light emitting device 70 emit light with different wavelength bands, it is possible to project an image with reduced color unevenness.

[0043] Furthermore, the light emitting device 70 has a multi-chip package structure, thereby providing a compact light source device 60 .

[0044] Furthermore, a convex lens and a concave lens, or a convex meniscus lens, are provided on the optical path from the light emitting device 70 to the microlens array 171. This allows the width of the light beam from the light emitting device 70 to be reduced if it is relatively wide, allowing more light to reach the effective area of ​​the microlens array 171, further reducing color unevenness.

[0045] Furthermore, the semiconductor light-emitting element of light source package 75 is a laser diode, and the light emitted from this laser diode is elliptical. The microlenses 171a of microlens array 171 are arranged in a grid pattern, and light emitting device 70 is configured so that the elliptical light from the laser diode is tilted relative to the arrangement direction of the microlenses 171a. Thus, the present invention can be implemented with a simple structure in which light emitting device 70 is tilted about the optical axis of microlens array 171.

[0046] The projection device 10 also includes a light source device 60, a display element 50 that generates image light by irradiating light from the microlens array 171, and a projection optical system 220 that projects the image light emitted from the display element 50. Thus, it is possible to provide a projection device 10 that is compact using a multi-chip package structure, improves light utilization efficiency, and reduces color unevenness.

[0047] Furthermore, the microlens array 171 has an effective area P set according to a ray angle limiting factor that limits the ray angle of image light from the display element 50, and the light L from the light emitting device 70 is irradiated into the effective area P. Thus, the projection device 10 can be formed with further reduced color unevenness.

[0048] Furthermore, the display elements 50 and 51 are DMDs or LCDs. This allows the light emitting device 70 to be used with projection devices 10 having various display element types, while reducing color unevenness. Furthermore, the projection device 10 includes a shielding plate 180 that blocks stray light from the light emitted from the light emitting device 70. The light source device 60 is configured such that light emitted from the display element 50 avoids the shielding plate 180 and is irradiated onto the projection optical system 220. This improves light utilization efficiency and reduces color unevenness even in a projection device 10 equipped with a shielding plate 180 that effectively blocks stray light.

[0049] The embodiments described above are provided as examples only and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways and can be omitted, replaced, or modified without departing from the spirit of the invention. These embodiments and their variations are included within the scope and spirit of the invention and are included in the invention described in the claims and their equivalents.

Claims

1. A light source device, wherein: have: A light emitting device is provided with a plurality of semiconductor light emitting elements; as well as microlens array, The light emitting device is configured so that light emitted from the light emitting device is deflected and irradiated onto the microlens array, and is configured so that light emitted from the microlens array does not irradiate an ineffective area of ​​a projection optical system.

2. The light source device according to claim 1, wherein The plurality of semiconductor light emitting elements in the light emitting device respectively emit light of different wavelength bands.

3. The light source device according to claim 1, wherein The light emitting device is composed of a multi-chip packaging structure. The light source device according to claim 1 , wherein: A convex lens and a concave lens, or a convex meniscus lens, are provided on the optical path from the light emitting device to the microlens array. The light source device according to claim 1 , wherein: Each of the semiconductor light emitting elements emits elliptical light. The plurality of microlenses of the microlens array are arranged in a grid shape. The light emitting device is configured so that the elliptical light is tilted relative to the arrangement direction of the plurality of micro lenses.

6. A projection device, wherein: have: The light source device according to any one of claims 1 to 5; a display element that is illuminated by light from the microlens array and generates image light; as well as The projection optical system projects the image light emitted from the display element.

7. The projection device according to claim 6, wherein: The microlens array has an effective area set according to a ray angle limiting factor, the ray angle limiting factor limiting the ray angle of the image light from the display element, The light from the light emitting device is irradiated into the effective area.

8. The projection device according to claim 6, wherein: The display element is a DMD or an LCD.

9. The projection device according to claim 6, wherein: A shielding plate is provided to shield stray light of the light emitted from the light emitting device, The light source device is arranged so that light emitted from the display element avoids the shielding plate and is irradiated onto the projection optical system.

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