JP6172494B2 - Light source device and projector - Google Patents

Description

  The present invention relates to a light source device and a projector.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen. This projector focuses light emitted from a light source on a micromirror display element called DMD or a liquid crystal plate to display a color image on a screen.

  In such projectors, a projector having a high-intensity discharge lamp as a light source has been mainly used in the past. However, in recent years, red, green, and blue light-emitting diodes and laser diodes, or solid-state light-emitting elements such as organic ELs have been used as light sources. Developments have been made to use and many proposals have been made.

  A light source device using a laser diode can be easily reduced in size and can be a small and high-intensity light source device suitable for a projector. The image quality could be degraded.

  For this reason, laser light is emitted from a splitting unit that splits the wavefront emitted from the light source, a conversion unit that rotates the polarization plane of the split light beam of the wavefront, and a combining unit that superimposes the wavefronts of the light beams with different polarization plane orientations. A light source device combined with an element has also been proposed (for example, Patent Document 1).

JP 2008-185628 A

  However, in Patent Document 1, since light emitted from a light source is once divided, and a predetermined surface is irradiated so as to overlap after rotating the polarization plane of the divided light, the light source device is complicated and easy to manufacture. It was not.

  The present invention eliminates the above-mentioned drawbacks, and provides a light source device suitable for a projector using a plurality of light sources and having a simple structure as a small and high-brightness light source, and a projector capable of small and high-brightness projection. Is.

The light source device according to the present invention includes a plurality of light sources in which a light source element that emits laser light and a collimator lens that makes light emitted from the light source element substantially parallel light, and light from the plurality of light sources overlapped. And a microlens array and a condensing lens for condensing the superposed light on the surface of the display element that is a predetermined surface, and the degree of condensing of the light bundle of the emitted light from the light source is determined by the light source. It is characterized by being different .

  A projector according to the present invention includes a light source device, a display element that forms an optical image when irradiated with light from the light source device, a projection-side optical system that projects an optical image formed by the display element on a screen, Projector control means having light source control means and display element control means of the light source device, wherein the light source device is the light source device of the present invention.

  According to the present invention, the concentration of emitted light from each light source that is a semiconductor laser light emitting element is made different for each light source light, and the light source light having different interference fringe pitches in the laser light is used. Then, it is possible to provide a laser light source device and a projector that make interference fringes inconspicuous.

1 is an external perspective view showing a projector according to an embodiment of the present invention. It is a functional block diagram of the projector which concerns on embodiment of this invention. 1 is a schematic plan view showing an internal structure of a projector according to an embodiment of the invention. 1 is a schematic plan view showing an optical system of a projector according to an embodiment of the invention. It is the plane schematic diagram and side surface schematic diagram which show the microlens array which concerns on embodiment of this invention. It is a side surface schematic diagram explaining the lens simple substance in the micro lens array concerning an embodiment of the invention. It is a schematic diagram explaining one state of the light source light in the light source device of the projector according to the embodiment of the present invention. It is explanatory drawing regarding the irradiation area | region of the laser light source in the light source device of the projector which concerns on embodiment of this invention. It is a cross-sectional schematic diagram which shows an example of the structure of the laser light source in the light source device of the projector which concerns on embodiment of this invention. It is explanatory drawing which shows the interference fringe which arises in a light image with the light from each light source device which concerns on embodiment of this invention.

  Hereinafter, modes for carrying out the present invention will be described. FIG. 1 is an external perspective view of the projector 10. In the present embodiment, left and right in the projector 10 indicate the left and right direction with respect to the projection direction, and front and rear indicate the screen side direction of the projector 10 and the front and rear direction with respect to the traveling direction of the light beam.

  As shown in FIG. 1, the projector 10 has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers the projection port on the side of the front panel 12 that is a front side plate of the projector housing. The panel 12 is provided with a plurality of intake holes 18. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

  In addition, a key / indicator section 37 is provided on the top panel 11 of the casing. The key / indicator section 37 switches a power switch key, a power indicator for notifying power on / off, and switching on / off of projection. Keys and indicators such as an overheat indicator for notifying when a projection switch key, a light source device, a display element, a control circuit or the like is overheated are arranged.

  Further, on the rear surface of the casing, various terminals 20 such as an input / output connector section and a power adapter plug 20 provided with a USB terminal, a D-SUB terminal for inputting image signals, an S terminal, an RCA terminal, an audio output terminal, etc. on the rear panel. Is provided. In addition, a plurality of intake holes are formed in the back panel. A plurality of exhaust holes 17 are formed in each of the right panel, which is a side plate of the housing (not shown), and the left panel 15, which is the side plate shown in FIG. An intake hole 18 is also formed at a corner near the back panel of the left panel 15.

  Next, projector control means of the projector 10 will be described with reference to the functional block diagram of FIG. The projector control means includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like. The control unit 38 controls the operation of each circuit in the projector 10, and is composed of a ROM in which operation programs such as a CPU and various settings are fixedly stored, a RAM used as a work memory, and the like. Yes.

  Then, the image signal of various standards input from the input / output connector unit 21 by the projector control means is in a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). After being converted so as to be unified into an image signal, it is output to the display encoder 24.

  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 drive unit 26.

  The display drive unit 26 functions as display element control means, and drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24. By irradiating the display element 51 with the light bundle emitted from the light source device 60, a light image is formed by the reflected light of the display element 51, and the image is displayed on a screen (not shown) via a projection-side optical system described later. Is projected and displayed. The movable lens group 235 of the projection side optical system is driven by the lens motor 45 for zoom adjustment and focus adjustment.

  The image compression / decompression unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are data-compressed by a process such as ADCT and Huffman coding, and sequentially written in a memory card 32 that is a detachable recording medium. Further, the image compression / decompression unit 31 reads out the image data recorded in the memory card 32 in the reproduction mode, decompresses individual image data constituting a series of moving images in units of one frame, and converts the image data into the image conversion unit. A process for enabling display of a moving image or the like based on the image data output to the display encoder 24 and stored in the memory card 32 is performed.

  Then, an operation signal of a key / indicator unit 37 composed of a main key and an indicator provided on the top panel 11 of the housing is directly sent to the control unit 38, and a key operation signal from the remote controller is received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is output to the control unit 38.

  Note that an audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The sound processing unit 47 includes a sound source circuit such as a PCM sound source, converts the sound data into analog in the projection mode and the playback mode, and drives the speaker 48 to emit loud sounds.

  Further, the control unit 38 controls a light source control circuit 41 as a light source control means, and the light source control circuit 41 is configured so that light of a predetermined wavelength band required at the time of image generation is emitted from the light source device 60. The light source device 60 is controlled. The light source device 60 includes a green light source, a red light source device 120, and a blue light source device 130, which include an excitation light source unit 70 including a blue laser diode and a fluorescent light emitting unit 80 including a phosphor plate.

  Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided in the light source device 60 and the like, and controls the rotation speed of the cooling fan from the result of the temperature detection. In addition, the control unit 38 causes the cooling fan drive control circuit 43 to keep the cooling fan rotating even after the projector body is turned off by a timer or the like, or to turn off the projector body depending on the result of temperature detection by the temperature sensor. Control is also performed.

  Next, the internal structure of the projector 10 will be described. FIG. 3 is a schematic plan view showing the internal structure of the projector 10. As shown in FIG. 3, the projector 10 includes a control circuit board (not shown) in the vicinity of the right panel 14. The control circuit board includes a power circuit block, a light source control block, and the like. In addition, the projector 10 includes a light source device 60 at the side of the control circuit board, that is, at a substantially central portion of the projector housing.

  This light source device 60 is on the optical axis of the light source emitted from the excitation light source unit 70 and the excitation light source unit 70 disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the projector housing. A green light source device including a fluorescent light emitting unit 80 disposed in the vicinity of the front panel 12, a dichroic mirror 173 disposed between the excitation light source unit 70 and the fluorescent light emitting unit 80, an excitation light source unit 70, and a fluorescent light emitting unit 80 And a red light source device 120 and a blue light source device 130 disposed between them, and a microlens array 175, a condensing lens 178, and an irradiation mirror 185 as an irradiation optical system 170.

  The excitation light source unit 70 of the green light source device includes an excitation light source 71 by a semiconductor light emitting element arranged so that the optical axis is parallel to the back panel 13, and the optical axis of the emitted light from each excitation light source 71 in the direction of the front panel 12. A reflection mirror group 75 for converting 90 degrees and a heat sink 78 disposed between the excitation light source 71 and the right panel 14 are provided.

  In the excitation light source 71, blue laser diodes, which are a total of six semiconductor laser light-emitting elements in two rows and three columns, are arranged in a matrix, and the output from each blue laser diode is on the optical axis of each blue laser diode. A collimator lens 73, which is a condensing lens for adjusting the concentration of incident light, is arranged. The reflection mirror group 75 includes a plurality of reflection mirrors arranged in a stepped manner, and reduces the cross-sectional area of the light beam emitted from the excitation light source unit 70 in one direction and emits it to the fluorescent light emitting unit 80.

  Excitation light emitted from the excitation light source unit 70 passes through a dichroic mirror 173 that transmits blue and red light and reflects green, and further passes through a condenser lens group 85 to be irradiated on a phosphor 83 that is a light emitting plate. The Then, the green wavelength band light that is excited and emitted from the phosphor 83 by irradiating the phosphor 83 with the excitation light is emitted in all directions, directly to the dichroic mirror 173 side, or as described in detail later. After being reflected by the reflection surface on the front heat sink 110 side, it is emitted to the dichroic mirror 173 side. The green wavelength band light emitted from the phosphor 83 is reflected by the dichroic mirror 173 and is incident on the microlens array 175.

  A cooling fan 261 is disposed between the heat sink 78 and the back panel 13, and the excitation light source unit 70, the red light source device 120, and the blue light source device 130 are cooled by the cooling fan 261 and the heat sink 78. Further, a cooling fan 261 is disposed between the reflection mirror group 75 and the back panel 13, and the reflection mirror group 75 is cooled by the cooling fan 261.

  The fluorescent light emitting unit 80 of the green light source device is arranged in parallel with the front panel 12, that is, the plate of the phosphor 83 arranged so as to be orthogonal to the optical axis of the emitted light from the excitation light source unit 70, and the fluorescent light A condensing lens group 85 that condenses the excitation light applied to the plate of the body 83 and the fluorescent light emitted from the phosphor 83, and a heat sink 110 are provided. The heat sink 110 is mirrored by silver vapor deposition or the like to form a reflection surface that reflects light, and a phosphor 83 plate is formed on the reflection surface. Further, the plate of the phosphor 83 may be a sintered body, for example. Further, for example, without forming a reflection surface on the heat sink 110, the plate of the phosphor 83 may be one in which the phosphor 83 is installed on a metal plate on which the reflection surface is formed. Further, a cooling fan 244 as cooling means is disposed on the front panel 12 side of the fluorescent light emitting unit 80, and the heat sink 110 of the fluorescent light emitting unit 80 is cooled by the cooling fan 244.

  The red light source device 120 includes a red light source element 121 arranged so that the optical axis of the excitation light incident on the fluorescent light emitting unit 80 and the optical axis intersect perpendicularly, and a collimator lens that collects the emitted light from the red light source element 121 125 and a light source. Further, the red light source elements 121 are red laser diodes as semiconductor laser light emitting elements that emit light in the red wavelength band, and four are arranged side by side vertically and horizontally.

  Then, the red wavelength band light irradiated by the red light source device 120 is incident on the microlens array 175 of the irradiation optical system 170 in the same manner as the green wavelength band light transmitted through the dichroic mirror 173 and emitted from the fluorescent light emitting unit 80. The Rukoto.

  Further, the blue light source device 130 also has a blue light source element 131 disposed so that the optical axis of the excitation light incident on the fluorescent light emitting unit 80 and the optical axis intersect perpendicularly, and a collimator that collects the emitted light from the blue light source element 131 The lens 135 includes a light source and is arranged so as to be aligned with the red light source device 120. The blue light source element 131 is a blue laser diode as a semiconductor laser light emitting element that emits blue wavelength band light, and two blue light source elements are arranged side by side.

  Then, the blue wavelength band light irradiated by the blue light source device 130 is incident on the microlens array 175 of the irradiation optical system 170 in the same manner as the green wavelength band light transmitted through the dichroic mirror 173 and emitted from the fluorescent light emitting unit 80. The Rukoto.

  A heat sink 190 is disposed between the display element 51 and the back panel 13, and the display element 51 is cooled by the heat sink 190. Further, in the vicinity of the front surface of the display element 51, light from the irradiation mirror 185 of the irradiation optical system 170 enters the display element 51 that is a DMD at an appropriate angle, is reflected by the display element 51, and is emitted from the display element 51. A condenser lens 195 that makes the ON light incident on the projection-side optical system 220 is disposed.

  The lens group of the projection-side optical system 220 emits ON light reflected by the display element 51 to the screen. The projection-side optical system 220 includes a fixed lens group 225 built in a fixed lens barrel and a movable lens group 235 built in a movable lens barrel, and is a variable focus lens having a zoom function, and is movable by a lens motor. Zoom adjustment and focus adjustment can be performed by moving the lens group 235.

The state of light of the optical system in the light source device 60 will be described in detail with reference to FIGS.
FIG. 4 is a schematic plan view showing the optical system of the projector according to the embodiment of the present invention.
In the green light source device, the laser light from the excitation light source 71 in the excitation light source unit 70 is transmitted through the collimator lens 73 and through the dichroic mirror 173, and condensed by the condenser lens group 85. 83 is irradiated, and fluorescent light is generated from the phosphor 83.

  The fluorescent light emitted from the phosphor 83 is reflected by the dichroic mirror 173 as a light bundle in a substantially parallel state by the condenser lens group 85, and enters the microlens array 175 perpendicularly.

  FIG. 5 is a schematic plan view and a schematic side view showing a microlens array according to an embodiment of the present invention. As shown in FIG. 5A, the microlens array 175 has spherical convex portions 176 and 177 formed at corresponding positions on both surfaces of the thick transparent plate. As shown in FIG. 5 (b), the microlens array 175 includes a plurality of microlenses 179 that are convex lenses each having a spherical convex portion 176, 177 having a rectangular shape by cutting the periphery of a thick biconvex lens. Individually arranged. The light emitted from each light source is divided by the microlens array 175, and the shape of each divided light is converted into a shape matching the shape of the display area of the display element 51 that is a predetermined surface.

  FIG. 6 is a schematic side view for explaining a single microlens in the microlens array 175 according to the embodiment of the present invention. As shown in FIG. 6, the emission direction of light incident on the convex portion of the incident surface at an angle within a predetermined range from the perpendicular to the surface of the microlens 179 is the position and angle at which each microlens 179 is incident. It is decided according to.

  A condensing lens 178 is provided so that the light incident on each microlens 179 forms an image on the surface of the display element 51 that is a predetermined surface. That is, light is condensed from each microlens so as to overlap on the surface of the display element 51 that is a predetermined surface by the condenser lens 178.

  FIG. 7 is a schematic diagram for explaining one state of the light source light in the light source device of the projector according to the embodiment of the present invention. Red light from four red light source elements 121 as red light source devices 120 (FIG. 7 shows two of the four installed red laser diodes on the same column). Is collimated by the collimator lens 125 to be a light bundle having a slight difference in the degree of light collection, and is incident on the microlens array 175.

  It should be noted that the blue laser diodes that are the two blue light source elements 131 to be the blue light source device 130 (FIG. 7 shows one of the two blue laser diodes installed in the same row as the red laser diode described above. Blue light from the above is also made into a light bundle having a slight difference in the degree of condensing by the collimator lens 135 and is incident on the microlens array 175.

FIG. 8 is an explanatory diagram relating to the irradiation region of the laser light source in the light source device of the projector according to the embodiment of the present invention. As shown in FIG. 8, the laser light from each red light source element 121 and each blue light source element 131 is transmitted through a dichroic mirror 173, and the light bundles from each light source are in accordance with the arrangement of each light source. Are irradiated with a difference in the degree of light collection as an optical axis perpendicular to the microlens array 175.
An area 300 in FIG. 8 indicates a light spot emitted from the red light source element 121, and an area 301 in FIG. 8 indicates a light spot emitted from the blue light source element 131.

  Further, when laser light is incident on the microlens array 175 of the irradiation optical system 170, interference fringes are generated in the light irradiated on the surface of the display element 51 that is a predetermined surface by the condenser lens 178 or the like, and a plurality of interference fringes are generated. When a semiconductor laser light emitting element is used as a light source, interference fringes with a certain width are formed depending on the wavelength of the laser light. Therefore, even if the irradiation optical system 170 uses a plurality of red laser diodes and blue laser diodes, the interference fringes of the laser light of the same color have the same pitch. The image quality of the projected image is reduced by the interference fringes. In particular, red light having a long wavelength and a large number of elements is more likely to be uncomfortable to human eyes than blue light.

  In the present embodiment, when the laser light from the four red light source elements 121 is condensed by the collimator lens 125, the light beams having different condensing degrees are used. The pitch of the interference fringes is changed by giving a difference in the light collection degree. FIG. 10 is an explanatory diagram exemplarily illustrating interference fringes generated in a light image by light from each light source device according to the embodiment of the present invention. Optical images 400, 401, 402, and 403 respectively indicate interference fringes generated in the optical image formed on the surface of the display element 51 by the laser light emitted from each of the four red light source elements 121. FIG. 10 shows that bright and dark areas are formed at equal intervals in the optical image, and interference fringes are formed in the image. As shown in FIGS. 10A to 10D, the optical images 400, 401, 402, and 403 have different buffer fringe pitches.

  Accordingly, when the emitted light beams having different light collection degrees are overlapped on a predetermined surface by the irradiation optical system 170, that is, when the light images 401, 402, 403, 404 as shown in FIG. The change in the light and shade difference becomes a change in a plurality of stages, and the line width of each stripe pattern becomes narrow, making it difficult to identify the stripes on the projection image plane, thereby improving the image quality of the projection image.

  In addition, the laser light from the two blue light source elements 131 is also provided with a pitch difference in the interference fringes due to the laser light from the two blue light source elements 131 by varying the degree of condensing.

  As a light source having a different concentration, the flange 91 of the red light source element 121 or the blue light source element 131 is inserted into a predetermined recess in the flat plate-shaped diode holder 103 so that the optical axes of the emitted light from the respective light source elements are mutually aligned. To a predetermined position at a predetermined interval. FIG. 9 is a schematic sectional view showing an example of the structure of the laser light source in the light source device of the projector according to the embodiment of the present invention. As shown in FIG. 9, a lens holder 105 having a diode housing part 107 is attached to the diode holder 103, and the cylinder part 93 of the red light source element 121 and the blue light source element 131 is housed in the diode housing part 107 to be connected to the flange part 91. Each of the light source elements is fixed by pressing the peripheral front surface of the light source by the lens holder 105.

  In addition, collimator lenses 125 and 135 are inserted and fixed in the lens holding body 105. The distance between the laser diode as each light source element and the collimator lens is determined by the position of the stepped portion 109, and the position of the lens fixing hole. Thus, the optical axis of each collimator lens and the optical axis of the light emitted from each light source element are made to coincide with each other to provide a light source by a combination of the collimator lens and the light source element.

  In addition, the lead wire 95 of each light source element which is the red light source element 121 and the blue light source element 131 passes through the lens holder 105 and is connected to the light source control circuit 41 by a flexible substrate (not shown) on the heat sink 78 side of the lens holder 105. Has been.

  In this embodiment, the four collimator lenses 125 corresponding to the four red light source elements 121 have different curvature radii on the incident surface or the exit surface of the laser light, and the focal lengths of the four collimator lenses 125. Are different from each other. As the radius of curvature increases, the degree of light collection decreases. As the radius of curvature decreases, the degree of light collection increases.

  Note that the radius of curvature of both the entrance surface and the exit surface of the collimator lens 125 may be changed by the individual collimator lens 125.

  Therefore, even if the light source is combined with the collimator lens 125 having the same positional relationship with respect to the red light source element 121 having the same light emission characteristics, the degree of light condensing or diffusing in the emitted laser light from each light source that has passed through the collimator lens 125 in each light source. The degree will be different.

  When the light from each light source is irradiated onto the mirror surface of the display element 51 that is a predetermined surface via the microlens array 175 and the condenser lens 178 that are the irradiation optical system 170, the light from each light source is emitted. The pitch of the interference fringes on the predetermined surface varies depending on the difference in the degree of condensing and condensing.

  Even if the collimator lens 125 has the same shape and the same size as a glass material having a different refractive index by changing the material of each collimator lens 125, the collimator lens 125 has a different focal length, and the light source has the same structure. The light source may have a slight change in the light collection degree. For example, examples of the material include glass and KT (KTaO3) crystal.

  Furthermore, in the collimator lens 125 made of the same glass material or different glass materials, the focal length of the collimator lens 125 may be changed by changing the lens thickness, and there may be a difference in the concentration of the emitted light from the light source. A collimator lens 125 having a focal length or a different focal length is used, and the position of the stepped portion 109 of the lens holder 105 is changed to provide a difference in the concentration of light transmitted through the collimator lens 125. Increasing the thickness of the lens increases the light concentration, and decreasing the thickness of the lens decreases the light concentration. Further, when the distance between the collimator lens 125 and the light source element is increased, the light collection degree is increased. When the distance between the collimator lens 125 and the light source element is reduced, the light collection degree is decreased.

  Similarly, in each of the two blue light source elements 131, if each light source is used, the focal length of the collimator lens 135 combined with each blue light source element 131 or the distance from the blue light source element 131 is changed and emitted from each blue light source element 131. A difference is provided in the degree of condensing of each light beam transmitted through the collimator lens 135 and incident on the microlens array 175.

  However, the change in the light collection degree is within a range of several degrees, which is the range in which the light incident on each microlens in the microlens array 175 is emitted from the microlens, and is in a range that matches the characteristics of the microlens. It is determined.

  Specifically, the radius of curvature of the collimator lens 135 is set to 2.15 mm to 6.15 mm, the thickness of the collimator lens 135 is set to 2.2 mm to 4.5 mm, and the distance between the collimator lens 125 and the light source element is set. The distance is set to about 1.3 mm to 4.2 mm.

  In this way, the light that has passed through the microlens array 175 by changing the concentration of each light bundle in the light emitted from each light source of the red light source device 120 or the blue light source device 130 is transmitted to the predetermined surface via the condensing lens 178 or the like. When the light is condensed on the surface of the display element 51, the pitch of the interference fringes of the laser light emitted from different light sources changes.

  Therefore, when the interference fringe pattern of the laser light emitted from each light source is changed and the laser light from each light source is superimposed on a plane at a predetermined position, the number of steps of the interference fringe is increased, and the fringe pattern is increased. It is possible to make the interference fringe inconspicuous by reducing the interval of the.

  The projector 10 using the light source device 60 can improve the image quality of the projection image by making the stripe pattern in the projection image inconspicuous.

  In addition, if a collimator lens with a different thickness of the collimator lens or a radius of curvature of the lens surface is used, the interference fringes can be easily noticed by simply selecting a collimator lens to be combined with the light source element and making a difference in the degree of condensing in the light bundle from the light source Can be eliminated.

  And by using a collimator lens with a different refractive index depending on the material, it is possible to make the interference fringe inconspicuous by providing a difference in the degree of condensing in the light bundle from each light source even if it is a combination of members having the same shape and the same structure, The assembly of the light source is easy because it is a combination of members having the same shape.

  Furthermore, a light source having a difference in distance between the light source and the collimator lens can be easily manufactured by adjustment in assembling the light source.

  If light sources that emit light of the same wavelength band are combined, the interference fringes can be made inconspicuous by the interference fringes of different pitches from each light source while overlapping the light from each light source to make a bright irradiation surface.

  In addition, since the microlens array and condensing lens are provided, the superposed light can be condensed on the surface of the display element 51 which is a predetermined surface, and a bright irradiation surface with no conspicuous interference fringes, and thus a projection image is formed. can do.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

The invention described in the first claim of the present application will be appended below.
[1] A plurality of light sources each including a light source element that emits laser light and a collimator lens that condenses the light emitted from the light source element are provided, and the degree of condensing of the light flux of the light emitted from the light source is the light source. A light source device, which differs depending on the type.
[2] The light source device according to [1], wherein a radius of curvature of the collimator lens differs depending on the collimator lens.
[3] The light source device according to [1] or [2], wherein the collimator lens has a lens thickness that varies depending on the collimator lens.
[4] The light source device according to any one of [1] to [3], wherein a material of the collimator lens is different depending on the collimator lens.
[5] The light source device according to any one of [1] to [4], wherein a distance between a light source element and a collimator lens in the light source varies depending on the collimator lens.
[6] The light source device according to any one of [1] to [5], wherein each light source element in the plurality of light sources emits light in the same wavelength band.
[7] The microlens array and the condensing lens that superimpose light from the plurality of light sources and condense the superposed light on a surface of a display element that is a predetermined surface. [1] The light source device according to any one of [6].
[8] a light source device;
A display element that forms an optical image by being irradiated with light from the light source device;
A projection-side optical system that projects an optical image formed by the display element onto a screen;
Projector control means having light source control means and display element control means of the light source device, wherein the light source device is the light source device described in any one of [1] to [7]. projector.

DESCRIPTION OF SYMBOLS 10 Projector 11 Top panel 12 Front panel 13 Rear panel 14 Right side panel 15 Left side panel 17 Exhaust hole 18 Intake hole 19 Lens cover 20 Various terminals 21 Input / output connector part 22 Input / output interface 23 Image conversion part 24 Display encoder 25 Video RAM
26 display drive unit 31 image compression / decompression unit 32 memory card 35 Ir reception unit 36 Ir processing unit 37 key / indicator unit 38 control unit 41 light source control circuit 43 cooling fan drive control circuit 45 lens motor 47 audio processing unit 48 speaker 51 display element 60 Light source device 70 Excitation light source unit 71 Excitation light source 73 Collimator lens 75 Reflective mirror group 78 Heat sink 80 Fluorescent light emitting unit 83 Phosphor 85 Condensing lens group 91 Flange unit 93 Cylinder unit 95 Lead wire 100 Light source mounting body 103 Diode holder 105 Lens Holder 107 Diode housing portion 109 Stepped portion 110 Heat sink 120 Red light source device 121 Red light source device 125 Collimator lens 130 Blue light source device 131 Blue light source device 135 Collimator lens 170 Irradiation light System 173 Dichroic mirror 175 Micro lens array 176, 177 Spherical convex portion 178 Condensing lens 179 Micro lens 185 Irradiation mirror 190 Heat sink 220 Projection side optical system 225 Fixed lens group 235 Movable lens group 244 Cooling fan 300 Red light irradiation area 301 Blue Light irradiation area 400, 401, 402, 403 Light image

Claims (7)

A plurality of light sources in which a light source element that emits laser light and a collimator lens that makes light emitted from the light source element substantially parallel light ;
A microlens array and a condenser lens that superimposes the light from the plurality of light sources and condenses the superposed light on the surface of the display element that is a predetermined surface;
With
The light source device characterized in that the light bundle of the light beam emitted from the light source has a different degree of concentration depending on the light source.   The light source device according to claim 1, wherein a radius of curvature of the collimator lens differs depending on the collimator lens.   The light source device according to claim 1, wherein the collimator lens has a lens thickness that varies depending on the collimator lens.   The light source device according to claim 1, wherein a material of the collimator lens is different depending on the collimator lens.   5. The light source device according to claim 1, wherein a distance between the light source element and the collimator lens in the light source is different depending on the collimator lens.   The light source device according to claim 1, wherein each light source element in the plurality of light sources emits light in the same wavelength band. A light source device;
A display element that forms an optical image by being irradiated with light from the light source device;
A projection-side optical system that projects an optical image formed by the display element onto a screen;
A projector control means having a light source control means and a display element control means of the light source device, wherein the light source device is the light source device according to any one of claims 1 to 6 .

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