Light source device and projection device

Abstract

To provide a light source device and a projection device that improve use efficiency of light.SOLUTION: A light source device 60 of a projection device 10 comprises a light emission device 70 which is provided with a light source package 75 including a plurality of semiconductor light emitting elements, and a microlens array 171, and the light emission device 70 is so arranged that the microlens array 171 is irradiated with the light from the light mission device 70 biased and an ineffective region LS of a projection optical system 220 is not irradiated with light emitted from the microlens array 171.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Conventionally, light source devices and projection devices have been disclosed that use a light emitting device, such as a multi-chip package structure, including a plurality of semiconductor light emitting elements, such as laser diodes, mounted on the same substrate. For example, Patent Document 1 discloses a projection device that includes a light source module as a light emitting device and a light source device including a microlens array. Light from the light source module is irradiated onto the microlens array. The light irradiated onto the microlens array is emitted as uniform light and irradiated onto a display element, such as a DMD (Digital Micromirror Device), via other optical elements. When the light is irradiated onto the display element, image light is generated by the display element, and a projection image is projected via a projection lens, which is a projection optical system. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-154401 Summary of the Invention [Problem to be solved by the invention]

[0004] Light emitted from the light-emitting device is irradiated onto the display element via a reflecting mirror that changes the direction of the optical axis. A shielding plate for blocking stray light may be provided near the optical path of the image light generated by the display element until it enters the projection optical system. In such cases, an ineffective area in which light cannot be captured may be created in the projection optical system due to the influence of components such as the reflecting mirror and the shielding plate. Therefore, when light is emitted from a light-emitting device equipped with multiple semiconductor light-emitting elements, light emitted from some of the semiconductor light-emitting elements may be irradiated onto the ineffective area of ​​the projection optical system. This reduces the utilization efficiency of the light emitted from the light-emitting device.

[0005] In view of the above, an object of the present invention is to provide a light source device and a projection device that improve the light utilization efficiency. [Means for solving the problem]

[0006] The light source device of the present invention comprises a light emitting device having a plurality of semiconductor light emitting elements and a microlens array, and the light emitting device is arranged so that light from the light emitting device is biased and irradiated onto the microlens array, and so that light emitted from the microlens array does not irradiate the ineffective area of ​​the projection optical system.

[0007] A projection device of the present invention includes the above-described light source device, a display element that generates image light when irradiated with light from the microlens array, and a projection optical system that projects the image light emitted from the display element. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a light source device and a projection device with improved light utilization efficiency. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a diagram showing functional circuit blocks of the projection device according to the embodiment of the present invention. [Figure 2]FIG. 1 is a schematic plan view showing the internal structure of a projection device according to an embodiment of the present invention. [Figure 3] 1 is a schematic front view of a light output device of a light source device according to an embodiment of the present invention, viewed from the output side. [Figure 4] 1 is a schematic diagram showing the positional relationship between a microlens array and a light output device of a light source device according to an embodiment of the present invention, as viewed from the opposite side to the output side of the light output device, where only some of the microlenses in the microlens array are shown. [Figure 5] 1 is a schematic diagram showing how light from a light output device enters a projection optical system via a microlens array and a display element, in which the light from the light output device is irradiated without being deflected onto the microlens array, and in which the light is shown as entering the microlens array from the back side of the paper. [Figure 6] 1 is a schematic diagram showing how light from a light output device according to an embodiment of the present invention is incident on a projection optical system via a microlens array and a display element, in which the light from the light output device is biased and irradiated onto the microlens array, and in which the light is shown as being incident on the microlens array from the back side of the paper. [Figure 7] FIG. 10 is a schematic plan view showing the internal structure of a main part of a projection device according to a modified example of the embodiment of the present invention. [Figure 8] FIG. 10 is a schematic side view of the internal structure of a main part of a projection device according to another embodiment of the present invention. [Figure 9] 8, which shows the internal structure of the main parts of a projection device according to another embodiment of the present invention, is a schematic diagram showing the positional relationship between the microlens array, display element, prism, and projection optical system, as viewed from the opposite side to the emission side of the light emitting device. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a functional circuit block diagram of a projection device 10. The projection device control unit is composed of a CPU including an image conversion unit 23 and a control unit 38, a front-end unit including an input / output interface 22, a display encoder 24, and a display driver 26. Image signals of various standards input from an input / output connector unit 21 are converted by the image conversion unit 23 via the input / output interface 22 and system bus SB to unify them into image signals of a predetermined format suitable for display, and then output to the display encoder 24.

[0011] Furthermore, the display encoder 24 expands and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display driver .

[0012] The display driver 26 drives a display element 50, such as a DMD, which is 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 generates image light on the image forming surface of the display element 50 by irradiating the display element 50 with a bundle of rays emitted from the light source device 60, and projects the projection image onto a projection target such as a screen (not shown) via a projection optical system 220 (see FIG. 2). Note that a movable lens group 235 of this projection optical system 220 can be driven by a lens motor 45 for zoom adjustment and focus adjustment.

[0013] Furthermore, the image compression / expansion unit 31 performs a recording process in which the luminance signal and color difference signal of the image signal are compressed by processes such as ADCT and Huffman coding, and the data is sequentially written to a memory card 32, which is a removable recording medium. Furthermore, the image compression / expansion unit 31 reads image data recorded on the memory card 32 in the playback mode, expands each piece of image data constituting a series of moving images on a frame-by-frame basis, and outputs the expanded data to the display encoder 24 via the image conversion unit 23. Thus, the image compression / expansion unit 31 can output moving images, etc., based on the image data stored in the memory card 32.

[0014] The control unit 38 controls the operation of each circuit in the projection device 10, and is composed of a CPU, a ROM that permanently stores operation programs such as various settings, and a RAM used as a work memory.

[0015] The key / indicator section 37 is composed of main keys and indicators provided on the housing. Operation signals from the key / indicator section 37 are sent directly to the control section 38. In addition, key operation signals from the remote controller are received by the Ir receiving section 35, demodulated into code signals by the Ir processing section 36, and output to the control section 38.

[0016] The control unit 38 is connected to an audio processing unit 47 via a 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 data in the projection mode and playback mode, driving a speaker 48 to emit amplified sound.

[0017] 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-division manner so that light in a predetermined wavelength band required for image generation is emitted from the light source device 60.

[0018] Furthermore, the control unit 38 causes the cooling fan drive control circuit 43 to detect temperatures using a plurality of temperature sensors provided in the light source device 60, etc., and controls the rotation speed of the cooling fan 261 based on the results of this temperature detection. The control unit 38 also controls the cooling fan drive control circuit 43 to continue rotating the cooling fan 261 using a timer or the like even after the power to the projection device 10 main body is turned off, or to turn off the power to the projection device 10 main body depending on the results of temperature detection by the temperature sensors.

[0019] Next, the internal structure of the projection device 10 shown in Fig. 2 will be described. The housing of the projection device 10 is formed in a roughly box shape and includes upper and lower panels (not shown), a front panel 12, a rear panel 13, a right panel 14, and a left panel 15. The projection device 10 also has a projection opening 12a on the front side. In the following description, left and right of the projection device 10 refer to the left and right directions relative to the projection direction from the projection opening 12a, and front and rear refer to the direction toward the projection target of the projection device 10 and the front and rear directions relative to the traveling direction of the light beam.

[0020] The projection device 10 includes a control circuit board 242 near the left panel 15. This control circuit board 242 includes a power circuit block, a light source control block, and the like. The projection device 10 also includes a light source device 60 located approximately in the center of the projection device 10. Between the light source device 60 and the right panel 14, a power connector 57, a heat sink 130, a cooling fan 261, and the like are arranged. In addition, a display element 50 is provided on the left side of the light source device 60. The display element 50 is connected to a heat sink 190.

[0021] The light source device 60 includes a light emitting device 70, a light source optical system 140, and a light guiding optical system 170. Light emitted from the light emitting device 70 is incident on the light guiding optical system 170 via the light source optical system 140. The light guiding optical system 170 guides the light from the light source optical system 140 to the display element 50.

[0022] The light output device 70 is provided in approximately the center of the housing of the projection device 10 and is arranged to output light slightly forward and to the left. As shown in FIG. 3, the light output device 70 includes a single substrate 71 serving as a base member and a light source package 75 including a plurality of laser diodes, which are semiconductor light-emitting elements. The light source package 75 has a multi-chip package (MCP) structure in which the laser diodes and collimator lenses for collimating the laser light are packaged. In FIG. 3, the four light source packages 75 on the upper side are red light source packages 72 that emit red wavelength band light. Specifically, four laser diode chips that emit red wavelength band light are arranged horizontally on the substrate 71. In FIG. 3, of the five light source packages 75 on the lower side, the two light source packages 75 on the left side are blue light source packages 73 that emit blue wavelength band light. Specifically, two laser diode chips that emit blue wavelength band light are arranged horizontally on the substrate 71. In FIG. 3, of 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, three laser diode chips that emit light in the green wavelength band are arranged horizontally on the substrate 71. As described above, the multi-chip package structure in this embodiment refers to a structure in which a plurality of semiconductor light-emitting elements are arranged on a single substrate 71 that serves as a base member, as shown in FIG. 3. Furthermore, the configuration of the light emitting device 70 is not limited to that shown in FIG. 3. The number of semiconductor light-emitting elements that emit light of each color and are arranged on the substrate 71 may be arbitrary, and one semiconductor light-emitting element that emits light of each color may be arranged.

[0023] As shown in FIG. 4, the light output device 70 is disposed at an angle with respect to a microlens array 171 (described later). Here, the laser light emitted from the light source package 75 is elliptical, as indicated by light L. Meanwhile, the microlens array 171 has a plurality of microlenses 171a arranged in a lattice pattern. The light output device 70 is disposed such that the elliptical light L is inclined with respect to the arrangement direction of the plurality of microlenses 171a. For example, the vertical arrangement direction D1 of the microlenses 171a arranged in a lattice pattern vertically and horizontally and the major axis C1 of the ellipse of the light L are disposed at an angle of 0°<θ<90°. In this embodiment, θ≈45°. In other words, the light output device 70 is disposed such that the light L is inclined with respect to the arrangement direction of the microlenses 171a of the microlens array 171.

[0024] Returning to FIG. 2 , the light source optical system 140 includes a first condenser lens 141. The first condenser lens 141 is provided on the light path from the light output device 70 to the microlens array 171, on the output side of the light output device 70. The first condenser lens 141 can be a convex meniscus lens. This allows the light output device 70 to narrow the beam width of the output light and irradiate the microlens array 171 with the output light in a narrowed light beam state. Alternatively, by arranging a concave lens 142 on the output side of the first condenser lens 141 and making the first condenser lens 141 a convex lens, the beam width can be narrowed by combining the first condenser lens 141, which is a convex lens, with the concave lens 142.

[0025] The light source optical system 140 may also include a vibration diffuser 143 between the first condenser lens 141 and a microlens array 171 (described later). The vibration diffuser 143 includes a diffuser 143a and a vibration device 143b. The vibration device 143b can impart a small distance of reciprocating movement (i.e., vibration) in a direction parallel to the diffusion surface of the diffuser 143a (i.e., a surface perpendicular to the optical axis of the diffuser 143a). The vibration device 143b may employ various operating 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 143a, a linear guide mechanism, or a mechanism using a piezoelectric element. The projection device 10 can reduce speckle noise by projecting an image using light from the light output device 70, which is converted into laser light via the vibration diffuser 143, as light source light.

[0026] The light guide optical system 170 includes a microlens array 171, a concave lens 172, a second condenser lens 173, an irradiation mirror 175, and a condenser lens 176. Light from the light output device 70 is irradiated onto and enters the microlens array 171. The concave lens 172 is provided on the output 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 output side of the concave lens 172. The irradiation mirror 175 is arranged on the output 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 output 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 light beam is expanded by the concave lens 172. The light emitted from the concave lens 172 is condensed by the second condenser lens 173, bent by the irradiation mirror 175, and irradiated onto the image forming surface of the display element 50 via the condenser lens 176. In this way, the light from the microlens array 171 is irradiated onto the display element 50, and the display element 50 generates image light.

[0027] The projection optical system 220 has a movable lens group 235 and a fixed lens group 225. The fixed lens group 225, which is located on the optical axis of the condenser lens 176 on the front panel 12 side, is housed in a fixed lens barrel and can be moved manually or automatically to enable zoom adjustment and focus adjustment. When light is irradiated onto the image formation surface of the display element 50, which is a DMD, image light is generated by time-division display of light of each color according to data and is incident on the incident surface of the projection optical system 220 from the condenser lens 176. The image light incident on the projection optical system 220 is projected as a projection image from the projection port 12a towards the projection target.

[0028] The DMD of the display element 50 is a reflective element, and the position space of the microlens array 171 corresponds to the angle space of the DMD. Therefore, the light (light L from the light emitting device 70) incident on and irradiated to the microlens array 171 has different in-plane positions (virtual planes within the projection optical system. This virtual plane is called a pupil plane 220a (not shown)) depending on the positions of the cells (microlenses 175a) within the plane of the microlens array 171 to which it is incident. Unlike the present embodiment, FIG. 5 shows an example in which the major axis direction of the light emitted from the elliptical light emitting device 70 is approximately parallel to the arrangement direction of the microlenses 171a of the microlens array 171 (i.e., an example in which the light emitting device 70 is arranged so that θ=0° shown in FIG. 4 ) so that the light emitted from the light emitting device 70 is not biased with respect to the microlens array 171 (in other words, so that the light L is not shifted or biased with respect to the optical axis of the microlens array 171). In the example of Figure 5, the light emitted from the microlens array 171 is indicated by white arrows to show the chief ray and marginal ray bundles. The chief ray La1 of the light from the upper left of the microlens array 171 is at an angle indicated by the chief ray Lb1 that heads toward the lower right of the projection optical system 220 (pupil plane 220a of the projection optical system 220). Similarly, the chief ray La2 from the upper right is at an angle indicated by the lower left chief ray Lb2, the chief ray La3 from the lower left is at an angle indicated by the upper right chief ray Lb3, and the chief ray La4 from the lower right is at an angle indicated by the upper left chief ray Lb4. The marginal ray bundles of each chief ray are reflected by the display element 50 and taken into the projection optical system 220.

[0029] Meanwhile, in the projection device 10, a shielding plate 180 for blocking stray light emitted from the light emitting device 70, an irradiation mirror 175, and the like are provided on the optical path from the microlens array 171 to the display element 50 and around the optical path (see also FIG. 2 ). The shielding plate 180, the irradiation mirror 175, and the like restrict the angle of the light rays (image light) entering the projection optical system 220 from the display element 50. In addition to the shielding plate 180 and the irradiation mirror 175, the angle of the light rays entering the projection optical system 220 from the display element 50 is also restricted by the peripheral light ratio of the projection optical system 220. When the angle of the light rays entering the projection optical system 220 from the display element 50 is restricted in this way, an invalid region LS, which is a region where no light rays are captured, may occur inside the projection optical system 220, particularly in the peripheral portion within the plane of the projection optical system 220 (pupil plane 220a of the projection optical system 220). In the example of FIG. 5, peripheral light beams of chief rays Lb3 and Lb4 are difficult to capture. In the example of FIG. 5, chief ray La3 emitted from the microlens array 171 is partially blocked by part T1 at the corner of the reflecting mirror 175. The state of light blocking is indicated by hatching. Here, if the chief ray La3 irradiated onto the lower left of the microlens array 171 in FIG. 5 and emitted therefrom is blue wavelength band light, the light ray entering the projection optical system 220 from the display element 50 becomes chief ray Lb3. As a result, it becomes difficult for blue wavelength band light to be captured by the projection optical system 220, so the amount of blue wavelength band light is reduced (light utilization efficiency is reduced), resulting in blue color unevenness in the projected image. In addition, chief ray Lb4 emitted by the display element 50 is partially blocked by part T2 at the corner of the shielding plate 180. As with part T1, the state of light blocking is indicated by hatching. Similarly, if the chief ray La4 from the microlens array 171 is green wavelength band light, it becomes difficult to capture the chief ray Lb4, which is green wavelength band light captured from the display element 50 into the projection optical system 220, thereby reducing the light utilization efficiency and causing green color unevenness in the projected image.

[0030] Therefore, in this embodiment, the microlens array 171 is configured so that the entire light beam (light L) from the light output device 70 is biasedly irradiated onto the microlens array 171. That is, as shown in FIG. 6 (also see FIG. 4), the light L irradiated onto the microlens array 171 is biased in a direction oblique to the arrangement of the microlenses 171a of the microlens array 171. More specifically, as described above, the light output device 70 is disposed so that θ is approximately 45° (see FIG. 4). That is, in this embodiment of FIG. 6, the light L is not irradiated along the up-down or left-right direction of the microlens array 171 (for example, the arrangement direction of the microlenses 171a arranged in a lattice pattern) as in FIG. 5, but the light L irradiated onto the microlens array 171 is biasedly irradiated onto the microlens array 171. In other words, the light L irradiated onto the microlens array 171 is irradiated while being shifted in a rotational direction with respect to the optical axis MCL of the microlens array 171. By irradiating the entire light beam (light L) from the light output device 70 unevenly onto the microlens array 171, it is possible to allow the projection optical system 220 to capture image light from the display element 50 into an area MS other than the ineffective area LS. In other words, the area (effective area P) of the microlens array 171 corresponding to the area MS other than the ineffective area LS of the projection optical system 220 is set based on light ray angle regulation factors (for example, factors that regulate the angle of the light ray entering the projection optical system 220 from the display element 50, such as the shielding plate 180, the irradiation mirror 175, and the peripheral illumination ratio in the projection optical system 220), and the light L from the light output device 70 is irradiated onto the effective area P of the microlens array 171. As described above, the light output device 70 is disposed at an angle with respect to the microlens array 171 (the long axis direction of the elliptical light L is disposed at an angle with respect to the arrangement direction of the microlenses 171a), so that the 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 loss of image light generated by irradiating the display element 50 with light of each color wavelength band when it is taken into the projection optical system 220, thereby improving the light utilization efficiency and reducing color unevenness in the projected image. Then, for example, focusing on the shading plate 180, in the projection device 10, the light source device 60 is arranged so that light emitted from the display element 50 is irradiated onto the projection optical system 220 while avoiding the shading plate 180.

[0031] As disclosed in JP 2022-49752 A, the microlens array 171 can be arranged so as to be rotated around the optical axis of the microlens array 171 with respect to the horizontal plane of the projection device 10. Even in this case, the light output device 70 can be provided so that the entire light beam (light L) is biasedly irradiated onto the microlens array 171.

[0032] Modifications and other embodiments of this embodiment will be described below. The same components and parts are denoted by the same reference numerals, and their descriptions will be omitted or simplified. As shown in FIG. 7 , which illustrates a modification of this embodiment, the light source device 60 may be configured to have a dichroic mirror 144 disposed at the position where the light beams emitted from two light-emitting devices 70A and 70B intersect. For example, the light-emitting device 70A may emit red wavelength light, and the light-emitting device 70B may emit blue and green wavelength light. In this case, the dichroic mirror 144 is configured to transmit the red wavelength light and reflect the blue and green wavelength light. Thus, the red wavelength light emitted from the light-emitting device 70A passes through the dichroic mirror 144 and is irradiated onto the microlens array 171. The blue and green wavelength 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 disposed so that the entire light flux of the blue wavelength band light and the green wavelength band light emitted from the light emitting device 70B is irradiated onto the microlens array 171 in a biased manner.

[0033] 7 (and the first condenser lens 141 and concave lens 142 arranged corresponding to the light emitting device 70A) can be eliminated, and the light emitting device 70B can be made capable of emitting light in the red, blue, and green wavelength bands, with a reflecting mirror arranged instead of the dichroic mirror 144. In this case as well, the light emitting device 70B is arranged so that the entire luminous flux of the red wavelength band light, the blue wavelength band light, and the green wavelength band light emitted from the light emitting device 70B is unevenly irradiated onto the microlens array 171.

[0034] 8 and 9, a projection device 300 according to another embodiment employs an LCD (Liquid Crystal Display) system. For ease of explanation, FIG. 8 shows only a single LCD display element 51. In the projection device 300, light L from the light output device 70 is irradiated onto a microlens array 171 of a light-guiding optical system 170 via a light source optical system 140. The light L emitted from the microlens array 171 is irradiated onto a display element 51. The irradiated light L from the display element 51 is emitted as image light LA ​​and introduced into a projection optical system 220 via a prism 181. Projection light LB is emitted from a projection aperture 12a of the projection optical system 220, and a projection image is projected onto a screen 310.

[0035] Here, an effective area P of the microlens array 171 is set based on a light ray angle regulation factor. For example, in an LCD-type projection device 300, the optical axes of the display element 51 and the projection optical system 220 may be shifted so that a projected image is formed above the optical axis 220C of the projection optical system 220. That is, in this embodiment, the light ray angle regulation factor is the arrangement of the display element 51 and the projection optical system 220. If light is irradiated above the microlens array 171, as shown by light LE (indicated by the dashed arrow), the light will be at an angle that will not be captured by the projection optical system 220. Therefore, with reference to FIG. 9 as well, in the projection device 300, the area below the microlens array 171 is set as the effective area P. Then, by irradiating the effective area P with light L from the light emitting device 70 (in other words, the entire light beam (light L) from the light emitting device 70 is biasedly irradiated onto the microlens array 171, or the entire light beam (light L) from the light emitting device 70 is irradiated while being shifted downward from the optical axis MCL of the microlens array 171), the display element 51 is irradiated with light mainly consisting of the light beam at an angle indicated by the light L emitted from the microlens array 171. In this way, it is possible to reduce the intake loss of the light from the light emitting device 70 in the projection optical system 220, improve light utilization efficiency, and reduce color unevenness in the projected image.

[0036] As described above, according to an embodiment of the present invention, the light source device 60 comprises a light emitting device 70 having a light source package 75 including a plurality of semiconductor light emitting elements, and a microlens array 171, and the light emitting device 70 is arranged so that light from the light emitting device 70 is biased and irradiated onto the microlens array 171, and so that the light emitted from the microlens array 171 is not irradiated onto the invalid area LS of the projection optical system 220.

[0037] This allows the light source light to be emitted from the microlens array 171 so that the angle of the light rays entering the projection optical system 220 from the display element 50 is within a range that avoids the invalid region LS. This improves the light utilization efficiency even in a light source device 60 that uses a compact light-emitting device 70 equipped with multiple semiconductor light-emitting elements (light source packages 75) with different wavelength bands. The present invention can be implemented as long as the light-emitting device 70 is configured to emit light of a single color or two or more colors. If the multiple semiconductor light-emitting elements in the light-emitting device 70 emit light of different wavelength bands, as in this embodiment, a projected image with reduced color unevenness can be projected.

[0038] Furthermore, the light emitting device 70 has a multi-chip package structure, which makes it possible to provide a compact light source device 60.

[0039] Furthermore, one convex lens and one concave lens, or one convex meniscus lens, is provided on the optical path from the light emitting device 70 to the microlens array 171. This makes it possible to narrow the width of the light beam when the width of the light beam from the light emitting device 70 is wide, and therefore allows more light to be irradiated onto the effective area of ​​the microlens array 171, thereby further reducing color unevenness.

[0040] Furthermore, the semiconductor light emitting element of the light source package 75 is a laser diode, and the light emitted from this laser diode is elliptical light, the microlens array 171 has a plurality of microlenses 171a arranged in a lattice pattern, and the light emitting device 70 is provided so that the elliptical light from the laser diode is inclined with respect to the arrangement direction of the plurality of microlenses 171a. As a result, the present invention can be realized with a simple structure in which the light emitting device 70 is inclined around the optical axis of the microlens array 171.

[0041] The projection device 10 also includes a light source device 60, a display element 50 that generates image light when irradiated with light from the microlens array 171, and a projection optical system 220 that projects the image light emitted from the display element 50. This makes it possible to provide a projection device 10 that can be configured compactly using a multi-chip package structure, while improving light utilization efficiency and reducing color unevenness.

[0042] Furthermore, the microlens array 171 has an effective area P that is set based on a ray angle regulation factor that regulates the ray angle of the image light from the display element 50, and the light L from the light output device 70 is irradiated within the effective area P. This allows the projection device 10 to have even less color unevenness.

[0043] Furthermore, the display elements 50, 51 are DMDs or LCDs. This makes it possible to reduce color unevenness in projection devices 10 equipped with various types of display elements while using the light output device 70. The projection device 10 also has a shielding plate 180 that blocks stray light from the light output device 70, and the light source device 60 is positioned so that light output from the display element 50 is irradiated onto the projection optical system 220 while avoiding the shielding plate 180. In this way, even in a projection device 10 equipped with a shielding plate 180 that effectively blocks stray light, it is possible to improve light utilization efficiency and reduce color unevenness.

[0044] The above-described embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0045] 10,300...projection device, 50, 51...display element, 60...light source device, 70, 70A, 70B...light output device, 142...concave lens, 171...microlens array, 171a...microlens, 172...concave lens, 175a...microlens, 220...projection optical system, P...effective area

Claims

1. a light emitting device provided with a plurality of semiconductor light emitting elements; a microlens array, the light output device is arranged so that the light from the light output device is biased and irradiated onto the microlens array, and so that the light output from the microlens array is not irradiated onto an ineffective region of the projection optical system. Light source device.

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

3. The light source device according to claim 1 , wherein the light emitting device has a multi-chip package structure.

4. The light source device according to claim 1 , wherein one convex lens and one concave lens, or one convex meniscus lens, is provided on the optical path from the light emitting device to the microlens array.

5. Each of the semiconductor light emitting elements emits elliptical light, The microlens array has a plurality of microlenses arranged in a grid pattern, The light source device according to claim 1 , wherein the light output device is provided so that the elliptical light is inclined with respect to an arrangement direction of the plurality of microlenses.

6. A light source device according to any one of claims 1 to 5; a display element that generates image light when illuminated with light from the microlens array; a projection optical system that projects the image light emitted from the display element; A projection device having:

7. the microlens array has an effective area set based on a ray angle regulation factor that regulates a ray angle of the image light from the display element; The projection device according to claim 6 , wherein the light from the light output device is irradiated within the effective area.

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

9. a shielding plate for shielding stray light emitted from the light emitting device, 7. The projection apparatus according to claim 6, wherein the light source device is disposed so that light emitted from the display element is irradiated onto the projection optical system while avoiding the shielding plate.

Images