Light source device, projection device, and light source control method

Abstract

To provide a light source device, a projection device, a microlens array, and a light source control method which can reduce the size of an optical system.SOLUTION: A light source device 60 includes: a light source; a light condensing optical system 140 for condensing a light ray bundle emitted from the light source with a plurality of lenses; a microlens array 90 formed with size corresponding to a condensed light diameter of the light ray bundle which has been condensed by the light condensing optical system 140 and has come in from the light condensing optical system 140; and a display element 51 emitting light rays which have been transmitted by the microlens array 90 so as to be superimposed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Conventionally, projection devices have been used that collect light emitted from a light source onto a micromirror display element called a DMD (Digital Micromirror Device) or a display element such as a liquid crystal panel, and display a color image on a screen. For example, Patent Document 1 discloses a projection device (illumination optical device) that includes a light source lamp, a first lens array composed of a plurality of collecting lenses that collects the light emitted from the light source to form a plurality of images, a second lens array composed of a plurality of collecting lenses that is placed near the plurality of images formed by the first lens array, and a collecting lens system that collects the plurality of images that have passed through the first lens array and the second lens array by superimposing them at the same position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-98488 Summary of the Invention [Problem to be solved by the invention]

[0004] In the projection device of Patent Document 1, the lens array becomes huge, which may result in the area occupied by the optical system in the projection device becoming large.

[0005] The present invention relates to a light source device and a projection device that can reduce the size of an optical system. reference The present invention aims to provide a light source control method. [Means for solving the problem]

[0006] The light source device of the present invention includes a light source, a focusing optical system that focuses a light beam emitted from the light source using a plurality of lenses, a microlens array onto which the light beam focused by the focusing optical system is incident, and a concave lens. a convex lens arranged so that the light beam transmitted through the concave lens is incident thereon; a display element that is irradiated with the light that has passed through the microlens array and been superimposed, and the concave lens is disposed between the microlens array and the display element in contact with the microlens array. The convex lens is disposed at a position where it can receive marginal light from the bundle of rays emitted from the concave lens. It is characterized by the fact that

[0007] The projection device of the present invention includes a light source, a focusing optical system that focuses a light beam emitted from the light source using a plurality of lenses, a microlens array onto which the light beam focused by the focusing optical system is incident, and a concave lens. a convex lens arranged so that the light beam transmitted through the concave lens is incident thereon; a display element that forms image light by being irradiated with the light beams that have passed through the microlens array and been superimposed; a projection optical system that projects the image light; and a control unit that controls the light source and the display element, wherein the concave lens is disposed between the microlens array and the display element in contact with the microlens array. The convex lens is disposed at a position where it can receive marginal light from the bundle of rays emitted from the concave lens. It is characterized by the fact that

[0008] The present invention The projection device may include a fluorescent wheel device, in which case the control unit controls the fluorescent wheel device.

[0009] The light source control method of the present invention for a light source device includes: a light source; a focusing optical system including a plurality of lenses; a microlens array onto which a light beam focused by the focusing optical system is incident; a display element; and a concave lens disposed between the microlens array and the display element in contact with the microlens array. a convex lens arranged so that the light beam transmitted through the concave lens is incident thereon; a control unit that controls the light source and the display element, the convex lens is disposed at a position where marginal light of the bundle of rays emitted from the concave lens can be incident thereon; The control unit is characterized in that it focuses the light beams emitted from the light source using multiple lenses of the focusing optical system, and irradiates the light beams that have passed through the microlens array and been superimposed onto the display element. [Effects of the Invention]

[0010] According to the present invention, a light source device and a projection device that can reduce the size of an optical system are provided. reference and a light source control method. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a diagram showing functional blocks of a projection device according to an 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 plan view of a fluorescent wheel according to an embodiment of the present invention; [Figure 4] FIG. 2 is a diagram showing the optical path of light incident on a microlens array according to an embodiment of the present invention. [Figure 5] 3A and 3B are diagrams illustrating the optical paths of light before and after a microlens array according to an embodiment of the present invention. [Figure 6] FIG. 2 is a diagram showing the optical paths of light emitted from a microlens array according to an embodiment of the present invention. [Figure 7] 1A to 1C are schematic plan views showing a part of the internal structure of a projection device according to modified examples of an embodiment of the present invention, where (a) shows modified example 1, (b) shows modified example 2, and (c) shows modified example 3. [Figure 8] 1 is a diagram showing an example in which a microlens array according to an embodiment of the present invention is applied to an LCD-type projection device. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a diagram showing functional circuit blocks of a projection device control unit 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 formatter unit including 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 a system bus (SB) to unify them into image signals of a predetermined format suitable for display, and then output to the display encoder 24.

[0013] The display encoder 24 develops 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 .

[0014] The display driver 26 drives the display element 51, 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 display element 51 is a mirror device that reflects incident light with a plurality of micromirrors to form image light.

[0015] The projection device 10 then irradiates the light beam emitted from the light source device 60 onto the display element 51 via the condensing optical system 140, thereby forming an optical image with the light reflected from the display element 51, and projects and displays the image on a projection target such as a screen (not shown) via the projection optical system 220 (see FIG. 2). Note that the movable lens group 235 of this projection optical system 220 can be driven by the lens motor 45 for zoom adjustment and focus adjustment.

[0016] 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 compressed data is written sequentially to a memory card 32, which is a removable recording medium.

[0017] Furthermore, the image compression / expansion unit 31 reads out image data recorded on the memory card 32 in playback mode and expands each piece of image data constituting a series of moving images on a frame-by-frame basis. The image compression / expansion unit 31 outputs the image data to the display encoder 24 via the image conversion unit 23, and performs processing to enable the display of moving images, etc., based on the image data stored on the memory card 32.

[0018] The control unit 38 controls the operation of each circuit in the projection device 10, and is made up of a CPU, a ROM that permanently stores operation programs such as various settings, a RAM used as a work memory, and the like.

[0019] An operation signal from a key / indicator section 37, which is composed of main keys and indicators provided on the top panel of the housing, is sent directly to a control section 38. A key operation signal from a remote controller is received by an Ir receiving section 35, and a code signal demodulated by an Ir processing section 36 is output to the control section 38.

[0020] 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 output audible audio.

[0021] Furthermore, the control unit 38 controls a light source control circuit 41 as a light source control unit. The light source control circuit 41 can control the operation of the light source device 60, which includes an excitation light irradiating device 70, a red light source device 120, a fluorescent wheel device 100, and the like, which will be described later, so that light in a predetermined wavelength band required for image generation is emitted from the light source device 60.

[0022] Next, the internal structure of this projection device 10 will be described. Figure 2 is a schematic plan view showing the internal structure of projection device 10. Here, the housing of projection device 10 is formed in a roughly box shape and includes a front panel 12, a rear panel 13, a right panel 14, and a left panel 15. In the following description, left and right of projection device 10 refer to the left and right directions relative to the projection direction, and front and rear refer to the screen side of projection device 10 and the front and rear directions relative to the traveling direction of a light beam.

[0023] The projection device 10 includes a control circuit board 241 near the left panel 15. This control circuit board 241 includes a power supply circuit block, a light source control block, etc. The projection device 10 also includes a light source device 60 in the approximate center of the housing. The light guide optical system 180 and the projection optical system 220 are disposed between the light source device 60 and the left panel 15.

[0024] The light source device 60 includes an excitation light irradiating device 70 that serves as a light source of blue wavelength band light Lb and also as an excitation light source, a red light source device 120 that serves as a light source of red wavelength band light Lr, and a green light source device 80 that serves as a light source of green wavelength band light Lg. The green light source device 80 is composed of the excitation light irradiating device 70 and a fluorescent wheel device 100. The light source device 60 also includes a condensing optical system 140 that guides the blue wavelength band light Lb, the green wavelength band light Lg, and the red wavelength band light Lr. The condensing optical system 140 includes a first condensing lens group 111 and a second condensing lens group 125 as multiple lenses, as well as a blue light path-side condensing lens 146, a first condensing lens 147, a second condensing lens 148, and a third condensing lens 149. The light collecting optical system 140 collects the light emitted from the light source devices of each color (excitation light emitting device 70 , green light source device 80 and red light source device 120 ) onto the entrance of the microlens array 90 .

[0025] The excitation light irradiation device 70 is disposed near the rear panel 13 in approximately the center of the housing of the projection device 10 in the left-right direction. The excitation light irradiation device 70 includes a light source group consisting of blue laser diodes 71, a reflecting mirror group 75, an excitation light path-side collecting lens 77, a diffuser plate 78, etc. The light source group is composed of a plurality of blue laser diodes 71 which are semiconductor light-emitting elements arranged so that their optical axes are parallel to the rear panel 13. The reflecting mirror group 75 converts the optical axis of light emitted from each blue laser diode 71 by approximately 90 degrees toward the front panel 12. Blue wavelength band light emitted from the blue laser diodes 71 is collected by the excitation light path-side collecting lens 77, diffused by the diffuser plate 78, and guided toward the first collecting lens group 111.

[0026] The blue laser diodes 71 constituting the light source group are arranged in a matrix of 2 rows and 4 columns. A collimator lens 73 is arranged on the optical axis of each blue laser diode 71 to convert the light emitted from the blue laser diode 71 into parallel light so as to increase the directivity. The reflecting mirror group 75 is formed by arranging a plurality of reflecting mirrors in a stepped pattern, integrating them with a mirror substrate (not shown), and adjusting their positions, and the effective diameter of the light beam emitted from the blue laser diode 71 is narrowed in one direction before it is emitted.

[0027] The red light source device 120 includes a red light emitting diode 121 arranged so that its optical axis is parallel to that of the blue laser diode 71, and a second condensing lens group 125 that condenses light emitted from the red light emitting diode 121. The red light emitting diode 121 is a red light emitting diode that is a semiconductor light emitting element that emits red wavelength band light Lr. The red light source device 120 is arranged so that the optical axis of the red wavelength band light emitted from the red light source device 120 intersects with the optical axis of the blue wavelength band light Lb emitted from the excitation light irradiation device 70 and the optical axis of the green wavelength band light Lg emitted from the fluorescent wheel 101. The second condensing lens group 125 includes two plano-convex lenses with convex surfaces on the emission surface side of the red wavelength band light Lr. The red light source device 120 further includes a heat sink and a cooling fan (not shown) to cool the red light emitting diode 121. A red laser diode may be disposed instead of the red light emitting diode 121.

[0028] The fluorescent wheel device 100 constituting the green light source device 80 is disposed on the optical path of the excitation light emitted from the excitation light irradiating device 70 and near the front panel 12. The fluorescent wheel device 100 includes a fluorescent wheel 101 disposed parallel to the front panel 12 (in other words, perpendicular to the optical axis of the light emitted from the excitation light irradiating device 70), a motor 110 that rotates the fluorescent wheel 101, a drive control device (not shown) that drives and controls the motor 110, and a first condenser lens group 111 that condenses the ray bundle of the excitation light emitted from the excitation light irradiating device 70 onto the fluorescent wheel 101 and condenses the ray bundle of the green wavelength band light Lg emitted from the fluorescent wheel 101 toward the rear panel 13. The first condenser lens group 111 includes two plano-convex lenses with convex surfaces on the incident surface side of the blue wavelength band light Lb (i.e., the exit surface side of the green wavelength band light Lg). The drive control device is controlled by the light source control circuit 41 described above.

[0029] The fluorescent wheel 101 shown in FIG. 3 is formed in a disk shape and can be rotated by driving a motor 110 connected via bearings 112. The fluorescent wheel 101 has fluorescence-emitting regions 310 and transmission regions 320 arranged side by side in the circumferential direction as multiple light source segments. The base material of the fluorescent wheel 101 can be formed from a metal base material such as copper or aluminum. The surface of this base material facing the excitation light irradiation device 70 is mirror-finished by silver deposition or the like. The fluorescent light-emitting region 310 has a green phosphor layer formed on this mirror-finished surface. The fluorescent light-emitting region 310 receives blue wavelength band light Lb from the excitation light irradiation device 70 as excitation light and emits green wavelength band fluorescence (green wavelength band light Lg) in all directions. This green wavelength band light Lg enters the fluorescent wheel device 100 and enters the first condenser lens group 111 on the first dichroic mirror 141 side.

[0030] The transmission region 320 of the luminous wheel 101 can be formed by fitting a translucent substrate into a cutout formed in the base material of the luminous wheel 101. The transparent substrate is made of a transparent material such as glass or resin. The transparent substrate may have a diffusion layer on the surface on the side irradiated with the blue wavelength band light Lb or on the opposite side. The diffusion layer can be formed, for example, by forming minute irregularities on the surface of the transparent substrate by sandblasting or the like. The blue wavelength band light Lb from the excitation light irradiation device 70 incident on the transmission region 320 has its condensed diameter narrowed by the excitation light path side condenser lens 77 and the first condenser lens group 111, is transmitted or diffused through the transmission region 320, and is emitted toward the first reflecting mirror 142. The blue wavelength band light Lb is condensed in the transmission region 320 (or at a position before or after the transmission region 320), and the optical image is inverted about the optical axis. The transmission area 320 of the fluorescent wheel 101 serves as an optical reference plane A (optical reference point) for light incident on the microlens array 90 (see also FIGS. 2 and 4), which will be described later.

[0031] When the irradiation region of the fluorescent wheel 101 with the blue wavelength band light Lb is the fluorescent light emission region 310, the green wavelength band light Lg excited by the blue wavelength band light Lb is emitted toward the first condenser lens group 111. On the other hand, when the irradiation region of the fluorescent wheel 101 with the blue wavelength band light Lb is the transmission region 320, the blue wavelength band light Lb emitted from the blue laser diode 71 passes through the fluorescent wheel 101 and is guided to the first reflecting mirror 142.

[0032] The focusing optical system 140 includes a plurality of focusing lenses that focus light beams in the red, green, and blue wavelength bands, a reflecting mirror that converts the optical axes of the light beams in each color wavelength band to form a single optical axis, a dichroic mirror, etc. Specifically, the focusing optical system 140 includes a first dichroic mirror 141 disposed at a position where the blue wavelength band light Lb emitted from the excitation light irradiation device 70, the green wavelength band light Lg emitted from the fluorescent wheel 101, and the red wavelength band light Lr emitted from the red light source device 120 intersect. The first dichroic mirror 141 transmits the blue wavelength band light Lb and the red wavelength band light Lr and reflects the green wavelength band light Lg. Therefore, the optical axis of the green wavelength band light Lg emitted from the fluorescent wheel 101 is converted by 90 degrees toward the left panel 15.

[0033] Furthermore, a first reflecting mirror 142 is disposed on the optical axis of the blue wavelength band light Lb that has been transmitted or diffused through the fluorescent wheel 101, and the first reflecting mirror 142 reflects the blue wavelength band light Lb and converts the optical axis by 90 degrees toward the left panel 15. A biconvex blue light path collecting lens 146 is disposed on the left panel 15 side of the first reflecting mirror 142. Furthermore, a second reflecting mirror 143 is disposed on the left panel 15 side of the blue light path collecting lens 146. A monoconvex first collecting lens 147 with a convex surface on the incident side is disposed on the rear panel 13 side of the second reflecting mirror 143. The second reflecting mirror 143 converts the blue wavelength band light Lb, which has been collected by the blue light path collecting lens 146, by 90 degrees toward the rear panel 13, and causes the light to enter the first collecting lens 147.

[0034] Furthermore, a second condenser lens 148, which is a convex lens (positive meniscus lens) having a convex surface on the incident side and a concave surface on the exit side, is disposed on the left panel 15 side of the first dichroic mirror 141. Furthermore, a second dichroic mirror 144 is disposed on the left panel 15 side of the second condenser lens 148 and on the rear panel 13 side of the first condenser lens 147. The second dichroic mirror 144 reflects the red wavelength band light Lr and the green wavelength band light Lg and converts their optical axes by 90 degrees toward the rear panel 13 side, while transmitting the blue wavelength band light Lb.

[0035] The optical axis of the red wavelength band light Lr transmitted through the first dichroic mirror 141 and the optical axis of the green wavelength band light Lg reflected by the first dichroic mirror 141 so as to coincide with the optical axis of the red wavelength band light Lr are incident on a second condenser lens 148. The red wavelength band light Lr and the green wavelength band light Lg transmitted through the second condenser lens 148 are reflected by the second dichroic mirror 144 and incident on a third condenser lens 149. On the other hand, the blue wavelength band light Lb condensed by the first condenser lens 147 is transmitted through the second dichroic mirror 144 and incident on the third condenser lens 149.

[0036] The third condenser lens 149 is a convex lens (positive meniscus lens) having a convex surface on the incident side and a concave surface on the exit side. The third condenser lens 149 condenses the red wavelength band light Lr, the green wavelength band light Lg, and the blue wavelength band light Lb incident from the second dichroic mirror 144 side, and emits them toward the third reflecting mirror 145 side. The optical axis of the bundle of rays emitted from the third condenser lens 149 is converted by the third reflecting mirror 145 toward the microlens array 90 side. Note that the third condenser lens 149 in this embodiment has a convex surface on the incident side, and light (condensed light) that forms an approximately focused image F2, which will be described later, is incident on the microlens array 90.

[0037] In this embodiment, the red wavelength band light Lr, the green wavelength band light Lg, and the blue wavelength band light Lb are incident on either the second condenser lens 148 or the third condenser lens 149, which are positive meniscus lenses, at one of their optical paths. This allows the incident light to be condensed at a short focal length, thereby reducing the aberration of the formed image F2 compared to when a plano-convex lens is used.

[0038] The light beams incident on the microlens array 90 have their optical paths converted to become light beams with a uniform intensity distribution, and are emitted to the concave lens 181 side (the display element 51 side). The optical paths before and after the microlens array 90 will also be described later.

[0039] The light-guiding optical system 180 has a concave lens 181, a convex lens 182, a reflecting mirror 183, and a condenser lens 184. The condenser lens 184 emits image light emitted from a display element 51 arranged on the rear panel 13 side of the condenser lens 184 toward the projection optical system 220, and is therefore also considered to be part of the projection optical system 220. The concave lens 181 is arranged between the microlens array 90 and the convex lens 182 (in other words, between the microlens array 90 and the display element 51). The convex lens 182 is arranged between the concave lens 181 and the reflecting mirror 183 (in other words, between the microlens array 90 and the display element 51).

[0040] Light emitted from the microlens array 90 enters a biconcave concave lens 181, where the ray bundle is expanded, and then enters the convex lens 182. The convex lens 182 collects the light emitted from the concave lens 181 and emits it to the reflecting mirror 183. The convex lens 182 of this embodiment is formed to be biconvex, with the convex surface on the exit side having a greater curvature than the convex surface on the entrance side. Because the convex lens 182 is biconvex, it has a short focal length, and the ray bundle can be irradiated onto the effective area of ​​the display element 51 over a relatively short distance. Therefore, the optical path length from the convex lens 182 to the display element 51 can be shortened, and the light source device 60 can be made more compact.

[0041] The light beam emitted from the convex lens 182 is reflected by a reflecting mirror 183 and irradiated at a predetermined angle onto the display element 51 via a condenser lens 184. The display element 51, which is a DMD, is provided with a heat sink 190 on the rear panel 13 side, and the display element 51 is cooled by this heat sink 190.

[0042] Here, the optical path from the light-collecting optical system 140, which is disposed before and after the microlens array 90, to the light-guiding optical system 180 will be described using the schematic diagrams of FIGS. 4 to 6. FIG. 4 schematically shows an optical reference plane A (optical reference point) on the object side, the light-collecting optical system 140, and the microlens array 90. Note that the microlens array 90 is shown in a side view and a plan view. Light L1 and L2 exemplify the optical paths of some of the light contained in the red wavelength band light Lr, the green wavelength band light Lg, or the blue wavelength band light Lb. The light-collecting optical system 140 in FIG. 4 shows a second condenser lens group 125 (simplified as one lens in FIG. 4), a second condenser lens 148, and a third condenser lens 149, which are disposed in the optical path of the red wavelength band light Lr. In the case of the optical path of the red wavelength band light Lr, the optical reference plane A is the light-emitting surface (light-emitting point) of the red light-emitting diode 121.

[0043] In the case of the optical path of the green wavelength band light Lg, the optical reference plane A is the light-emitting surface (light-emitting point) of the fluorescent light-emitting region 310 on the fluorescent wheel 101, and a first collecting lens group 111, a second collecting lens 148, and a third collecting lens 149 are arranged as the collecting optical system 140 (see the respective symbols in parentheses in FIG. 4). In the case of the optical path of the blue wavelength band light Lb, the optical reference plane A is the exit surface or collecting surface (exit point) of the transmission region 320 on the fluorescent wheel 101 where the blue wavelength band light emitted from the plurality of blue laser diodes 71 is collected (or nearly collected), and a blue light path-side collecting lens 146, a first collecting lens 147, and a third collecting lens 149 are arranged as the collecting optical system 140 (see the respective symbols in parentheses in FIG. 4). In the description of FIG. 4, the collecting optical system 140 corresponding to the optical path of the red wavelength band light Lr will be described.

[0044] Light emitted from the optical reference surface A is condensed by the second condenser lens group 125, the second condenser lens 148, and the third condenser lens 149, and enters the microlens array 90 while narrowing the light beam. The light-guiding optical system 180 shown in FIG. 2 is disposed closer to the display element 51 than the image plane B (image point) of the light condensed by the condensing optical system 140. The image plane B on which an image F2 of the optical reference surface A is formed is disposed on the incident surface 901 of the microlens array 90 (see also light L1 emitted from the center side of the optical axis P of the optical reference surface A and light L2 emitted from the outside of the optical axis P of the optical reference surface A). Therefore, light imaged in a shape similar to the light distribution on the optical reference surface A is incident on the microlens array 90. In the example of FIG. 4, the image F2 of the red wavelength band light Lr incident on the microlens array 90 is formed larger than the light F1 of the optical reference surface A.

[0045] Regarding the shape of image F2, in the case of red wavelength band light, the red light-emitting diode 121 emits light from a substantially rectangular light-emitting surface, and therefore, image F2 is also formed into a substantially rectangular shape as shown in the plan view of the microlens array 90 in Fig. 4. On the other hand, although not shown, in the case of blue wavelength band light, the cross-sectional shape of the ray bundle on the optical reference plane A is formed to be substantially circular (or substantially elliptical), and therefore, image F2 on the image formation plane B is also substantially circular (or substantially elliptical). Furthermore, in the case of green wavelength band light, light is emitted from a substantially circular (or substantially elliptical) light-emitting surface of the fluorescent light-emitting region 310, which is the optical reference plane A, and therefore, image F2 on the image formation plane B is also substantially circular (or substantially elliptical).

[0046] In addition, the image plane B may be located on the entrance surface 901 of the microlens array 90 (the entrance surface of the microlens 91 shown in Figure 5), on the exit surface 902, or at a position between the entrance surface 901 and the exit surface 902, or may be located near the front or back of the microlens array 90, and the microlens array 90 can be configured so that light that is approximately imaged with respect to the optical reference surface A enters the microlens array 90.

[0047] FIG. 5 shows the optical path of light L1 when it is incident on the incident surface 901 of a microlens 91 located on the optical axis P of the focusing optical system 140. The multiple microlenses 91 constituting the microlens array 90 are biconvex lenses having convex curved surfaces on the incident surface 901 and the exit surface 902, respectively. The optical axis P1 of the central microlens 91A onto which light L1 is incident, as shown in FIG. 5, coincides with the optical axis P of the focusing optical system 140. The microlens array 90 can diffuse an image F2 onto the optical reference surface A by the microlenses 91 for each partial region F21 (see also the plan view of the microlens array 90 in FIG. 4), irradiate the image F2 onto the display element 51, and superimpose the diffused images. Furthermore, the microlens array 90 of this embodiment is formed with a size corresponding to the focused diameter of the bundle of rays incident from the focusing optical system 140. Therefore, the microlens array 90 can be configured with a minimum size that allows light L2 emitted from outside the optical axis P of the optical reference surface A to be incident on the incident surface 901.

[0048] Light L1 indicates optical axis light L11 and marginal light L12 and L13 traveling along an optical path along the optical axis P of the focusing optical system 140. The optical axis light L11 and marginal light L12 and L13 are each shown as parallel light incident on the convex curved incident surface 901 of the central microlens 91A. The optical axis light L11 and marginal light L12 and L13 include optical axis light L111, L121, and L131 and marginal light L112, L122, L132, L113, L123, and L133, respectively, that are incident on the incident surface 901 of the central microlens 91A.

[0049] The optical axis light L11 and marginal light L12 and L13 incident from the focusing optical system 140 side are focused on the incident surface 901 and enter the central microlens 91A. When the light beams L11 to L13 exit from the exit surface 902 of the central microlens 91A, they are diffused to be superimposed as light beams L14 to L16.

[0050] The optical axis light L111, L121, and L131, which are components contained in the optical axis light L11 and the marginal light L12 and L13, are emitted as the optical axis light L14, which is approximately parallel, as the optical axis light L111a and the marginal light L121a and L131a, respectively. Furthermore, the marginal light L112, L122, and L132 are emitted as the marginal light L15, which is approximately parallel, as the optical axis light L112a and the marginal light L122a and L132a, respectively. Furthermore, the marginal light L113, L123, and L133 are emitted as the marginal light L16, which is approximately parallel, as the optical axis light L113a and the marginal light L123a and L133a, respectively.

[0051] 5, the optical path of light L2 shown in Fig. 4 is also incident on the microlens 91 and exits from the exit surface 902, similar to light L1, and is diffused so that the optical axis light and marginal light incident from the entrance surface 901 side are superimposed. The light beams exiting from each microlens 91 are also superimposed on each other.

[0052] FIG. 6 schematically shows the microlens array 90 and the concave lens 181 and convex lens 182 included in the light-guiding optical system 180. As described with reference to FIG. 5, the light L1 (optical axis light L14 and marginal light L15 and L16) emitted from the central microlens 91A is incident on the concave lens 181. The microlens array 90 and the concave lens 181 are arranged in contact with each other. For example, the exit surface 902 of the microlens array 90 can be in contact with the entrance surface or outer periphery of the concave lens 181. Alternatively, the outer periphery 903 of the microlens array 90 can be in contact with the entrance surface of the concave lens 181. The effective aperture R2 of the concave lens 181 is larger than the effective aperture R1 of the microlens array 90. The concave lens 181 diffuses the incident light L1 (widens the light beam) and emits it toward the convex lens 182. 4, the light L2 (optical axis light L24 and marginal light L25, L26) emitted from the microlens 91B on the lower end side is incident on the concave lens 181. The concave lens 181 diffuses the incident light L2 (widens the bundle of rays) and emits it toward the convex lens 182.

[0053] The convex lens 182 collects the incident light L1 so that the bundle of rays is narrowed (the convex lens 182 collects the light so that the angle of inclination with respect to the optical axis P becomes small), and emits the light L1 toward the display element 51 in FIG. 2. The convex lens 182 also collects the incident light L2 and emits it toward the display element 51 in the same manner as the light L1. Therefore, the light L1 and L2 incident on the display element 51 are irradiated onto the display element 51 in a state where they are nearly parallel to each other.

[0054] In this embodiment, a concave lens 181 that diffuses light is disposed between the microlens array 90 and the convex lens 182. Therefore, for example, light L2 emitted from the lower microlens 91B can mimic light emitted from a virtual microlens 91C that is located farther from the optical axis P than the lower microlens 91B. That is, by disposing the concave lens 181 immediately after the microlens array 90 and disposing the convex lens 182 immediately after the concave lens 181, even if the microlens array 90 is configured to be small, light from a virtually large microlens array can be made to enter the convex lens 182, and light that is more uniform than before entering the microlens array 90 can be guided toward the display element 51.

[0055] The convex lens 182 is disposed at a predetermined distance from the concave lens 181. This allows the ray bundle of light emitted from the concave lens 181 to be expanded to a certain extent before being condensed by the convex lens 182, so that the light irradiated onto the display element 51 can be made to be nearly parallel. Also, marginal light (for example, marginal light L25) emitted from the concave lens 181 can be taken into the convex lens 182, thereby improving the light utilization efficiency. Furthermore, by making nearly parallel light incident on the display element 51, it is possible to reduce a decrease in light utilization efficiency due to the generation of stray light, etc., even in the vicinity of the display element 51.

[0056] Returning to FIG. 2, a bundle of rays, which is light from the light source irradiated onto the image forming surface of the display element 51, is reflected by the image forming surface of the display element 51 and is projected as projection light onto a screen via the projection optical system 220. Here, the projection optical system 220 is made up of a condenser lens 184, a movable lens group 235, and a fixed lens group 225. The movable lens group 235 is formed to be movable by a lens motor 45. The movable lens group 235 and the fixed lens group 225 are built into a fixed lens barrel. Therefore, the fixed lens barrel equipped with the movable lens group 235 is a variable-focus lens, and is formed to be capable of zoom adjustment and focus adjustment.

[0057] By configuring the projection device 10 in this manner, when the fluorescent wheel 101 is rotated and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at different times, red wavelength band light, green wavelength band light, and blue wavelength band light are incident on the display element 51 via the focusing optical system 140 and the light guiding optical system 180, and the DMD, which is the display element 51 of the projection device 10, displays light of each color in a time-division manner according to data, thereby projecting a color image on the screen.

[0058] Next, Modifications 1 to 3 will be described with reference to Figures 7(a) to 7(c). The light source device 60 described above has a configuration including a concave lens 181 arranged immediately after the microlens array 90 and a convex lens 182 arranged immediately after the concave lens 181, but the arrangement of the microlens array 90, concave lens 181, and convex lens 182 can be changed as appropriate, as exemplified below.

[0059] In the light source device 60 of Modification 1 shown in FIG. 7(a), the microlens array 90 and the concave lens 181 are arranged with a gap between them so that they do not come into contact with each other. For example, the concave lens 181 can be positioned relatively far from the microlens array 90 and relatively close to the convex lens 182. In this case, the outer diameter (beam diameter) of the bundle of rays incident on the convex lens 182 (in FIG. 6, the light having a width from the outer marginal ray L25 emitted from the lower microlens 91B to the outer marginal ray (not shown) emitted from the upper microlens 91D) can be reduced. The outer diameter of the bundle of rays incident on the convex lens 182 can be set depending on the distance from the convex lens 182 to the display element 51, the size of the effective area where the micromirrors of the display element 51 are arranged, and the like. For example, the configuration of variant example 1 has a smaller outer diameter of the ray bundle than the configuration of projection device 10 shown in Figure 2, and can irradiate the display element 51 with approximately parallel and uniform light, so it can be applied even when the effective area of ​​the display element 51 is small.

[0060] In the light source device 60 of Modification 2 shown in Fig. 7(b), the microlens array 90 and the concave lens 181 are disposed between the third condenser lens 149 and the third reflecting mirror 145. Therefore, the light condensed by the third condenser lens 149 is incident on the microlens array 90 and the concave lens 181, is then reflected by the third reflecting mirror 145, and is incident on the convex lens 182. Note that Fig. 7(b) shows the case where the microlens array 90 and the concave lens 181 are in contact with each other, but similar to Modification 1, the microlens array 90 and the concave lens 181 may be disposed with a gap therebetween and not in contact with each other.

[0061] In the second modification, the distance from the concave lens 181 to the convex lens 182 can be increased, and therefore the outer diameter of the ray bundle incident on the convex lens 182 can be increased. For example, the configuration of the second modification has a larger outer diameter of the ray bundle than the configuration of the projection device 10 shown in Fig. 2, and can irradiate the display element 51 with substantially parallel and uniform light, and therefore can be applied even when the effective area of ​​the display element 51 is large.

[0062] 7(c), the light source device 60 of the third modification example shown in FIG. 7(c) has the microlens array 90 disposed between the third condenser lens 149 and the third reflecting mirror 145. Therefore, the light condensed by the third condenser lens 149 enters the microlens array 90, is then reflected by the third reflecting mirror 145, and enters the concave lens 181 and the convex lens 182.

[0063] In the third modification, the distance from the microlens array 90 to the concave lens 181 can be increased, so that even if the effective aperture R1 (see FIG. 6) of the microlens array 90 is small, the outer diameter of the ray bundle of the emitted light can be increased and made incident on the concave lens 181. As a result, the outer diameter of the ray bundle diffused by the concave lens 181 also increases, so that the convex lens 182 can irradiate the display element 51 with light having a large outer diameter and that is substantially parallel and uniform. For example, the configuration of the third modification can be applied even when the effective area of ​​the display element 51 is large. Note that the focal length of each microlens 91 of the microlens array 90 can be set so that marginal light (e.g., marginal light L25 in FIG. 6) of the light emitted from the microlens array 90 is incident on the effective aperture R2 (see FIG. 6) of the concave lens 181.

[0064] 1 to 7, other configurations described below may also be applied. For example, the light-guiding optical system 180 may be configured such that the concave lens 181 or the convex lens 182 is omitted between the microlens array 90 and the display element 51, depending on the size of the light beam, the optical path length, and the like. For example, when the distance between the microlens array 90 and the display element 51 is relatively short, the light emitted from the concave lens 181 may be irradiated directly (or via only the condenser lens 184 or the reflecting mirror 183). Note that the light source device 60 may be configured such that the concave lens 181 is not provided between the microlens array 90 and the convex lens 182, but is provided between the convex lens 182 and the display element 51; or the convex lens 182 is not provided between the concave lens 181 and the reflecting mirror 183, but is provided between the reflecting mirror 183 and the condenser lens 184.

[0065] Furthermore, the microlens 91 is not limited to being biconvex, but may be a single-convex lens with the incident surface 901 or the exit surface 902 flat.

[0066] Furthermore, in this embodiment, an example has been shown in which light is made incident on the microlens array 90 and made uniform in a DLP (Digital Light Processing) type projection device 10, but the configuration shown in this embodiment can also be applied to a so-called LCD (Liquid Crystal Display) type projection device 10A, as shown in Fig. 8. The microlens array 90 can be configured in the same way as the projection device 10 shown in Fig. 2 etc.

[0067] For example, the light source device 60A includes a lamp light source 60A1 having a cold mirror that transmits light in the visible light range (e.g., white light) including red wavelength band light Lr, green wavelength band light Lg, and blue wavelength band light Lb. The lamp light source 60A1 emits light to a condensing optical system 140A disposed in front of it. The condensing optical system 140A includes a visible light filter 500 that blocks light in the ultraviolet and infrared wavelength bands, a first condensing lens 141A, and a second condensing lens 142A, and guides the light in the visible light range condensed from the lamp light source 60A1 to the microlens array 90. The condensing optical system 140A may include a reflecting mirror to change the direction of the optical axis in the optical path. The shape and number of condensing lenses (including convex lenses and concave lenses) disposed in the condensing optical system 140A can be changed depending on the optical path length and light guide path within the projection device 10A.

[0068] Furthermore, a concave lens 181A and a convex lens 182A are arranged between the microlens array 90 on the output side of the microlens array 90 and the display elements (blue liquid crystal filter 51A, green liquid crystal filter 51B, and red liquid crystal filter 51C). Similar to the projection device 10 shown in FIG. 2 etc., the concave lens 181A is arranged immediately after the microlens array 90. Furthermore, the convex lens 182A is arranged immediately after the concave lens 181A. The light emitted from the microlens array 90 has its condensed diameter adjusted by the concave lens 181A and the convex lens 182A, and is guided to the blue spectral dichroic mirror 501.

[0069] Furthermore, the microlens array 90 is formed to have a size corresponding to the focused diameter of the light beam focused by the focusing optical system 140A and incident thereon. The microlens array 90 diffuses the irradiated light into each partial region and guides the light to a spectroscopic unit (including a blue spectroscopic dichroic mirror 501 and a green spectroscopic dichroic mirror 502) provided between the microlens array 90 and the display element (a blue liquid crystal filter 51A, a green liquid crystal filter 51B, and a red liquid crystal filter 51C). The light emitted from the microlens array 90 is split into separate colors by the spectroscopic unit, and then irradiated onto the image forming surfaces of multiple liquid crystal filters corresponding to the respective colors so as to be superimposed on each other.

[0070] Specifically, the blue spectral dichroic mirror 501 reflects blue wavelength band light Lb and transmits green wavelength band light Lg and red wavelength band light Lr out of the light emitted from the microlens array 90. The blue wavelength band light Lb guided by the blue spectral dichroic mirror 501 is reflected by the first total reflection mirror 503 and condensed by the first condenser lens 601, and then enters the blue liquid crystal filter 51A. The blue liquid crystal filter 51A forms image light corresponding to blue out of the image data and causes the image light to enter the dichroic prism 606.

[0071] The green wavelength band light Lg and the red wavelength band light Lr transmitted through the blue spectral dichroic mirror 501 are guided to the green spectral dichroic mirror 502. The green spectral dichroic mirror 502 reflects the green wavelength band light Lg and transmits the red wavelength band light Lr. The green wavelength band light Lg guided by the green spectral dichroic mirror 502 is condensed by a second condenser lens 602 and then enters the green liquid crystal filter 51B. The green liquid crystal filter 51B forms image light corresponding to green in the image data and causes the image light to enter the dichroic prism 606.

[0072] The red wavelength band light Lr transmitted through the green spectral dichroic mirror 502 is reflected by the second total reflection mirror 504 and the third total reflection mirror 505 and enters the third condenser lens 605. The red wavelength band light Lr is collected and guided by a first relay lens 603, which is a convex lens arranged between the green spectral dichroic mirror 502 and the second total reflection mirror 504, and a second relay lens 604, which is a convex lens arranged between the second total reflection mirror 504 and the third total reflection mirror 505. The red wavelength band light Lr guided from the third total reflection mirror 505 is collected by the third condenser lens 605 and then enters the red liquid crystal filter 51C. The red liquid crystal filter 51C forms image light corresponding to red in the image data and causes the image light to enter the dichroic prism 606.

[0073] The dichroic prism 606 reflects the blue wavelength band light Lb and the red wavelength band light Lr and transmits the green wavelength band light Lg, combines the light beams on the same optical path, and causes the light beams to enter the projection-side lens 607 as image light. The image light is projected via the projection-side lens 607 onto a screen or the like (not shown).

[0074] In this way, the light source device 60A can be configured such that the microlens array 90 is arranged on the lamp light source 60A1 side of the liquid crystal filters (liquid crystal panels) that are display elements arranged in three locations, and the blue, green, and red light that has been made uniform by the microlens array 90 is incident on the liquid crystal filters. Note that, regardless of the configuration shown in Fig. 8, optical elements such as concave and convex lenses may be further arranged between the microlens array 90 and the liquid crystal filters as needed.

[0075] In this embodiment, the light source devices 60, 60A and the projection device 10 are described, each of which includes a focusing optical system 140 that focuses a ray bundle emitted from a light source using a plurality of lenses, a microlens array 90 formed to have a size corresponding to the focused diameter of the ray bundle focused by the focusing optical system 140 and incident from the focusing optical system 140, and a display element 51 that is irradiated with light that has passed through the microlens array 90 and been superimposed. As a result, the microlens array 90 can be made smaller in size in accordance with the focused diameter of the incident ray bundle, and the optical system including the microlens array 90 can be made smaller. Therefore, the light source devices 60, 60A and the projection device 10 can be made smaller overall.

[0076] Also, the light source device 60 has been described, in which only one microlens array 90 is arranged. In a conventional configuration, it was necessary to arrange two microlens arrays 90 at a predetermined distance apart in consideration of the focal length, but by using the configuration of the embodiment of the present invention, it is possible to reduce the number of microlens arrays 90 to one, and the optical system in the projection device 10 can be made smaller.

[0077] Furthermore, in the light source device 60 in which the concave lens 181 is disposed between the microlens array 90 and the display element 51, even if the outer diameter of the ray bundle of light emitted from the microlens array 90 is small, the outer diameter of the ray bundle can be expanded to match the effective irradiation diameter of the display element 51 and irradiate the display element 51. Therefore, the microlens array 90 can be made smaller.

[0078] Furthermore, the light source device 60, in which a convex lens 182 is disposed between the microlens array 90 and the display element 51, can focus the light irradiated onto the display element 51 so that it approaches parallel light, thereby reducing stray light in the display element 51 and improving the efficiency of light utilization.

[0079] Furthermore, the light source device 60 has a concave lens 181 arranged behind the microlens array 90 and a convex lens 182 arranged behind the concave lens 181 between the microlens array 90 and the display element 51. Even if the outer diameter of the ray bundle of light emitted from the microlens array 90 is small, the light can be appropriately widened to match the effective irradiation diameter of the display element 51, making the light irradiated onto the display element 51 closer to parallel light. Therefore, the microlens array 90 can be configured to be compact while improving the light utilization efficiency of the display element 51.

[0080] Furthermore, the light source device 60 in which the convex lens 182 is arranged at a position where marginal light of the bundle of rays emitted from the concave lens 181 can be incident thereon can improve the efficiency of use of light from the light source.

[0081] Furthermore, the light source device 60, in which the microlens array 90 and the concave lens 181 are arranged in contact with each other and the effective aperture R2 of the concave lens 181 is larger than the effective aperture R1 of the microlens array 90, can reliably capture marginal light of the light emitted from the microlens array 90 into the concave lens 181 while reducing the size of the optical system area behind the microlens array 90. Therefore, the utilization efficiency of the light irradiated onto the display element 51 can be improved.

[0082] Furthermore, the microlens array 90 is disposed at a position where the light beams emitted from the light-collecting optical system 140 form an approximate image. Therefore, the light beams can be made incident on the microlens array 90 at a position where the condensed diameter is small, so that the effective aperture R1 of the microlens array 90 can be made small, and the microlens array 90 can be made compact. Therefore, the microlens array 90 can be constructed inexpensively, and the optical system of the entire light source device 60 can also be made compact.

[0083] Furthermore, in the light source device 60, in which the light beams incident on the microlens array 90 narrow the condensed diameter, the effective aperture R1 of the microlens array 90 can be made smaller than the effective aperture of the lens at the later stage of the condensing optical system 140 (the third condensing lens 149 in this embodiment), thereby making the entire microlens array 90 smaller.

[0084] Furthermore, the light source device 60 in which each microlens 91 of the microlens array 90 is a biconvex lens can shorten the focal length of the microlens 91, and can emit uniform light by overlapping it for each partial area F21 using a single component, thereby making it possible to miniaturize the configuration around the microlens array 90.

[0085] The condensing optical system 140 includes a first condenser lens 147 having a convex incident side and a flat exit side or a second condenser lens 148 having a convex incident side and a concave exit side, and a third condenser lens 149 having a convex incident side and a concave exit side onto which the ray bundles emitted from the first condenser lens 147 or the second condenser lens 148 are incident, and the light emitted from the third condenser lens 149 is incident on the microlens array 90. The ray bundles of light (red wavelength band light Lr, green wavelength band light Lg, and blue wavelength band light Lb) emitted from each light source are condensed by multiple lenses, so that the condensed diameter of the ray bundles incident on the microlens array 90 can be reduced.

[0086] Furthermore, the light source device 60, 60A, in which the microlens array 90 overlaps the ray bundles incident from the focusing optical system 140, 140A in each partial region, can homogenize the emitted light even if the intensity distribution of the light intensity of the light incident on the microlens array is biased.

[0087] Furthermore, a spectroscopic unit that separates the light emitted from the microlens array 90 into separate colors is provided between the microlens array 90 and the display elements (51A, 51B, 51C), and the display elements (51A, 51B, 51C) include a plurality of liquid crystal filters (51A, 51B, 51C) corresponding to the colors of the light separated by the spectroscopic unit and irradiated. As a result, the microlens array 90 shown in this embodiment can be applied to an LCD-type light source device 60A or a projection device, thereby making it possible to reduce the size of the optical system and the entire device.

[0088] The display element 51 is also configured as a mirror device that reflects incident light with a plurality of micromirrors to form image light. This allows light of different wavelengths (red wavelength band light Lr, green wavelength band light Lg, and blue wavelength band light Lb) to be guided along the same optical path to the display element 51, thereby enabling the configuration near the display element 51 to be miniaturized.

[0089] Furthermore, in the light source device 60 of this embodiment, the control unit 38 condenses the light beams emitted from the light source using the multiple lenses of the condensing optical system 140 (the first condensing lens group 111 and the second condensing lens group 125, as well as the blue light path side condensing lens 146, the first condensing lens 147, the second condensing lens 148, and the third condensing lens 149), and irradiates the display element 51 with the condensed light beams that have passed through the microlens array 90. This allows the microlens array 90 to be made smaller in size in accordance with the condensed diameter of the incident light beams, thereby enabling the optical system including the microlens array 90 to be made more compact. This allows the light source device 60 and the projection device 10 as a whole to be made more compact.

[0090] 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 inventions and their equivalents as defined in the claims.

[0091] The invention described in the first claim of the present application is as follows: [1] A light source; a focusing optical system that focuses a light beam emitted from the light source using a plurality of lenses; a microlens array formed to a size corresponding to the focused diameter of the ray bundle focused by the focusing optical system and incident from the focusing optical system; a display element that is irradiated with light that has passed through the microlens array and been superimposed; A light source device comprising: [2] The light source device according to [1], characterized in that only one microlens array is arranged. [3] The light source device according to [1] or [2], wherein a concave lens is disposed between the microlens array and the display element. [4] The light source device according to any one of [1] to [3], wherein a convex lens is disposed between the microlens array and the display element. [5] The light source device according to [1] or [2], characterized in that it has a concave lens arranged after the microlens array and a convex lens arranged after the concave lens between the microlens array and the display element. [6] The light source device according to [5], wherein the convex lens is disposed at a position where marginal light of the bundle of rays emitted from the concave lens can be incident thereon. [7] The microlens array and the concave lens are arranged in contact with each other; The effective aperture of the concave lens is larger than the effective aperture of the microlens array. The light source device according to [3], [5] or [6], characterized in that [8] The light source device according to any one of [1] to [7], characterized in that the microlens array is arranged at a position where the light beam emitted from the focusing optical system is approximately focused. [9] The light source device according to [8], wherein the light beam incident on the microlens array is incident while narrowing the focused diameter.

[10] The light source device according to any one of [1] to [9], wherein each microlens of the microlens array is a biconvex lens.

[11] The focusing optical system includes a first focusing lens having a convex incident side and a flat exit side, or a second focusing lens having a convex incident side and a concave exit side, and a third focusing lens having a convex incident side and a concave exit side, into which the ray bundle emitted from the first focusing lens or the second focusing lens is incident, The light beam emitted from the third condenser lens is incident on the microlens array. The light source device according to any one of [1] to

[10] above,

[12] The light source device according to any one of [1] to

[11] , wherein the microlens array overlaps the light beams incident from the focusing optical system for each partial area.

[13] A spectroscopic unit that separates the light emitted from the microlens array into separate colors is provided between the microlens array and the display element, the display element includes a plurality of liquid crystal filters corresponding to the colors of the light split by the splitting unit and irradiated; The light source device according to any one of [1] to

[12] above,

[14] The light source device according to any one of [1] to

[12] , wherein the display element is a mirror device that reflects incident light by a plurality of micromirrors to form image light.

[15] A light source; a focusing optical system that focuses a light beam emitted from the light source using a plurality of lenses; a microlens array formed to a size corresponding to the focused diameter of the ray bundle focused by the focusing optical system and incident from the focusing optical system; a display element that forms image light by being irradiated with light that has passed through the microlens array and been superimposed; a projection optical system that projects the image light; a control unit that controls the light source and the display element; A projection device comprising:

[16] A bundle of rays emitted from a light source and collected by a plurality of lenses of a collecting optical system, and formed to a size corresponding to the collected diameter of the bundle of rays incident from the collecting optical system, The transmitted light is superimposed on the display element and illuminated. A microlens array characterized by:

[17] A light source control method for a light source device including a light source, a focusing optical system including a plurality of lenses, a microlens array formed to a size corresponding to the focused diameter of a ray bundle focused by the focusing optical system and incident from the focusing optical system, a display element, and a control unit that controls the light source and the display element, The control unit The light beam emitted from the light source is condensed by a plurality of lenses of the condensing optical system; The light beams that have passed through the microlens array and are superimposed are irradiated onto the display element. A light source control method comprising: [Explanation of symbols]

[0092] 10,10A Projection unit 12 Front panel 13 Rear panel 14 Right side panel 15 Left side panel 21 Input / output connector section 22 Input / output interface 23 Image conversion unit 24 Display Encoder 25 Video RAM 26 Display driver 31 Image compression / expansion unit 32 Memory card 35 IR receiver 36 Ir processing section 37 Key / indicator section 38 control unit 41 light source control circuit 45 Lens motor 47 Audio processing unit 48 Speaker 51 Display element 51A Blue liquid crystal filter 51B Green liquid crystal filter 51C Red liquid crystal filter 60,60A Light source device 60A1 Lamp light source 70 Excitation light irradiation device 71 Blue laser diode 73 Collimator lens 75 Reflecting mirror group 77 Excitation light path side focusing lens 78 Diffuser plate 80 Green light source device 90 Microlens array 91 Microlens 91A Center microlens 91B Bottom microlens 91C Virtual microlens 91D Top microlens 100 Fluorescent wheel device 101 Fluorescent wheel 110 motor 111 first condenser lens group 112 bearing 120 red light source device 121 Red light emitting diode 125 Second condenser lens group 140, 140A Light collecting optical system 141 First dichroic mirror 141A First condenser lens 142A Second condenser lens 142 First reflecting mirror 143 Second reflecting mirror 144 Second dichroic mirror 145 Third reflecting mirror 146 Blue light path side condenser lens 147 First condenser lens 148 Second condenser lens 149 Third condenser lens 180 Light guide optical system 181,181A Concave lens 182,182A Convex lens 183 Reflecting mirror 184 Condenser lens 190 Heat sink 220 Projection optical system 225 Fixed lens group 235 Movable lens group 241 Control circuit board 310 Fluorescent light emitting region 320 Transmittance region 500 Visible light filter 501 Blue spectral dichroic mirror 502 Green spectral dichroic mirror 503 First total reflection mirror 504 Second total reflection mirror 505 Third total reflection mirror 601 First condenser lens 602 Second condenser lens 603 First relay lens 604 Second relay lens 605 Third condenser lens 606 Dichroic prism 607 Projection side lens 901 Incident surface 902 Exit surface 903 Outer rim A Optical reference plane B Imaging plane F1 light F2 image F21 partial area L1~L3 light L11 optical axis light L111 Optical axis light L112, L113 Marginal light L111a~L113a Optical axis light L12 Marginal light L121 Optical axis light L122, L123 Marginal light L121a~L123a Marginal light L13 Marginal light L131 Optical axis light L132, L133 Marginal light L14 Optical axis light L15, L16 Marginal light L24 Optical axis light L25, L26 Marginal light Lb Blue wavelength band light Lg Green wavelength band light Lr Red wavelength band light P,P1 Optical axis R1, R2 effective diameter

Claims

1. A light source and a focusing optical system that focuses a light beam emitted from the light source using a plurality of lenses; a microlens array onto which the light beams collected by the collecting optical system are incident; A concave lens and a convex lens arranged so that the light beam transmitted through the concave lens is incident thereon; a display element that is irradiated with the light beams that have passed through the microlens array and been superimposed; Equipped with the concave lens is disposed between the microlens array and the display element in contact with the microlens array; The light source device is characterized in that the convex lens is disposed at a position where marginal light of the bundle of rays emitted from the concave lens can be incident thereon.

2. A light source; a focusing optical system that focuses a light beam emitted from the light source using a plurality of lenses; a microlens array onto which the light beams collected by the collecting optical system are incident; A concave lens and a display element that is irradiated with the light beams that have passed through the microlens array and been superimposed; Equipped with the concave lens is disposed between the microlens array and the display element in contact with the microlens array; the focusing optical system includes a first focusing lens having a convex incident side and a flat exit side or a second focusing lens having a convex incident side and a concave exit side, and a third focusing lens having a convex incident side and a concave exit side, into which a bundle of rays emitted from the first focusing lens or the second focusing lens is incident, A light source device, characterized in that a light beam emitted from the third condenser lens is incident on the microlens array.

3. 3. The light source device according to claim 1, further comprising a convex lens disposed between the microlens array and the display element.

4. 3. The light source device according to claim 2, further comprising a convex lens arranged so that the bundle of rays transmitted through the concave lens is incident thereon.

5. 5. The light source device according to claim 2, wherein the convex lens is disposed at a position where marginal light of the bundle of rays emitted from the concave lens can be incident thereon.

6. The effective aperture of the concave lens is larger than the effective aperture of the microlens array.

6. The light source device according to claim 1, wherein the light source device is a light source unit.

7. 7. The light source device according to claim 1, wherein the microlens array is disposed at a position where a bundle of rays emitted from the light-collecting optical system forms an approximate image.

8. 8. The light source device according to claim 7, wherein the light beams incident on the microlens array are incident while narrowing the condensed diameter of the light beams incident from the condensing optical system.

9. the focusing optical system includes a first focusing lens having a convex incident side and a flat exit side or a second focusing lens having a convex incident side and a concave exit side, and a third focusing lens having a convex incident side and a concave exit side, into which a bundle of rays emitted from the first focusing lens or the second focusing lens is incident, The light beam emitted from the third condenser lens is incident on the microlens array.

2. The light source device according to claim 1.

10. A light source and a focusing optical system that focuses a light beam emitted from the light source using a plurality of lenses; a microlens array onto which the light beams collected by the collecting optical system are incident; A concave lens and a convex lens arranged so that the light beam transmitted through the concave lens is incident thereon; a display element that is irradiated with the light beams that have passed through the microlens array and been superimposed, and that forms image light; a projection optical system that projects the image light; a control unit that controls the light source and the display element; Equipped with the concave lens is disposed between the microlens array and the display element in contact with the microlens array; a convex lens disposed at a position where it can receive marginal light of the bundle of rays emitted from the concave lens;

11. A light source; a focusing optical system that focuses a light beam emitted from the light source using a plurality of lenses; a microlens array onto which the light beams collected by the collecting optical system are incident; A concave lens and a display element that is irradiated with the light beams that have passed through the microlens array and been superimposed, and that forms image light; a projection optical system that projects the image light; a control unit that controls the light source and the display element; Equipped with the concave lens is disposed between the microlens array and the display element in contact with the microlens array; the focusing optical system includes a first focusing lens having a convex incident side and a flat exit side or a second focusing lens having a convex incident side and a concave exit side, and a third focusing lens having a convex incident side and a concave exit side, into which a bundle of rays emitted from the first focusing lens or the second focusing lens is incident, A projection device, wherein a light beam emitted from the third condenser lens is incident on the microlens array.

12. A light source control method for a light source device, comprising: the light source device includes a light source, a focusing optical system including a plurality of lenses, a microlens array onto which a light beam focused by the focusing optical system is incident, a display element, a concave lens disposed between the microlens array and the display element in contact with the microlens array, a convex lens disposed so that the light beam transmitted through the concave lens is incident thereon, and a control unit that controls the light source and the display element; the convex lens is disposed at a position where marginal light of the bundle of rays emitted from the concave lens can be incident thereon; The control unit The light beam emitted from the light source is condensed by a plurality of lenses of the condensing optical system; The light beams that have passed through the microlens array and are superimposed are irradiated onto the display element. A light source control method comprising:

Images