JP2017156619A - Light source device and projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device that can suppress color unevenness and luminance unevenness of image light, and a projection device including the light source device and capable of projecting image light with suppressed color unevenness and luminance unevenness.SOLUTION: A light source device 60 comprises: a blue laser diode 301 of a blue light source device 300 as a semiconductor light-emitting element; and a light shaping part 320 receiving light from the blue laser diode 301 and shaping and emitting the light. The light shaping part 320 includes a shaping lens (first shaping lens 330, second shaping lens 340) having an incidence plane on which a cylindrical concave shape is formed, and an emission surface on which an axially symmetric shape is formed. The light from the blue laser diode 301 has a section elliptical shape, and the blue laser diode 301 and the shaping lens are arranged so that a longitudinal direction of the section elliptical shape and a longer direction of the cylindrical concave shape coincide with each other.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a light source device and a projection device including the light source device.

  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. In the past, projectors using a high-intensity discharge lamp as the light source have been the mainstream. However, in recent years, projectors using laser diodes as power-saving, long-life, high-intensity semiconductor light-emitting elements have been proposed. Has been made.

  The projector disclosed in Patent Document 1 includes a blue laser diode that emits blue wavelength band light as a light source, a red laser diode that emits red wavelength band light, and a green wavelength band by irradiating the phosphor layer with excitation light. A fluorescent light emitting device that emits light is provided. Light emitted from each color laser diode, which is a semiconductor light emitting element, is applied to the microlens array via a collimator lens, thereby being diffused light having a uniform intensity distribution and guided to the display element. Similarly, the fluorescent light from the fluorescent light emitting device is also guided to the display element through the same microlens array.

JP2013-190591A

  In general, it is known that the cross-sectional shape of light emitted from a laser diode that is a semiconductor light emitting element is an elliptical shape. In the projector disclosed in Patent Document 1, even the laser light transmitted through the microlens array is irradiated to the display element while maintaining the elliptical cross section of the laser light having strong directivity. At this time, there is a case where the laser light is not sufficiently irradiated to the peripheral portion as compared with the central portion of the image forming surface of the display element. As a result, the image light emitted from the display element may cause color unevenness and luminance unevenness between the central portion and the peripheral portion of the screen (screen).

  The present invention provides a light source device that can suppress color unevenness and luminance unevenness of image light, and a projection device that includes this light source device and can project image light with suppressed color unevenness and luminance unevenness. .

  The light source device according to the present invention includes a semiconductor light emitting element and a light shaping unit that shapes and emits light from the semiconductor light emitting element, and the light shaping unit has a cylindrical concave shape. And a light-emitting surface formed with an axisymmetric shape, and the light from the semiconductor light-emitting element has an elliptical cross section, and the semiconductor light-emitting element and the shaping lens Are arranged such that the major axis direction of the elliptical cross section coincides with the longitudinal direction of the cylindrical concave shape.

  A projection apparatus according to the present invention projects the above-described light source apparatus, a display element that is irradiated with light source light from the light source apparatus to form image light, and the image light emitted from the display element onto a screen. It has a side optical system, the said display element, and the projection apparatus control part which controls the said light source device, It is characterized by the above-mentioned.

  According to the present invention, it is possible to provide a light source device in which color unevenness and luminance unevenness are reduced, and a projection device including the light source device.

It is an external appearance perspective view which shows the projector which concerns on embodiment of this invention. It is a figure which shows the functional block of the projection apparatus which concerns on embodiment of this invention. It is a plane schematic diagram which shows the internal structure of the projection apparatus which concerns on embodiment of this invention. It is a perspective view which shows a mode that the laser diode which concerns on embodiment of this invention is radiate | emitting light. It is a schematic diagram which shows a mode that the emitted light from the laser diode which concerns on embodiment of this invention permeate | transmits a light shaping part, (a) is a side view in yz plane, (b) is xz plane. FIG. It is a plane schematic diagram which shows a mode that light is incident on the microlens array which concerns on embodiment of this invention. It is a schematic diagram which shows a mode that the emitted light from the laser diode which concerns on the modification of embodiment of this invention permeate | transmits a light shaping part, (a) is a side view in a yz plane, (b) is x It is a side view in -z plane.

  Embodiments according to the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of the projection apparatus 10. In the present embodiment, left and right in the projection device 10 indicate the left and right direction with respect to the projection direction, and front and rear indicate the screen side direction of the projection device 10 and the front and rear direction with respect to the traveling direction of the light flux.

  As shown in FIG. 1, the projection device 10 has a substantially rectangular parallelepiped shape, and has a projection unit on the side of the front panel 12 that is a side plate in front of the housing of the projection device 10, and the front panel 12. Is provided with a plurality of exhaust holes 17. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

  The upper case 11 of the housing is provided with a key / indicator section 37. The key / indicator section 37 is 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 unit, a display element, a control circuit, etc. are overheated are arranged. Further, the upper case 11 covers up to a part of the upper surface and the left side surface of the housing of the projection device 10, and is configured such that the upper case 11 can be detached from the lower case 16 in the event of a failure or the like.

  In addition, an input / output connector is provided on the rear surface of the housing, which is provided with a D-SUB terminal, an S terminal, an RCA terminal, an audio output terminal, etc. for inputting a USB terminal or an analog RGB video signal on a back plate (not shown). And various terminals such as a power adapter plug are provided. In addition, a plurality of air intake holes are formed in the rear panel of the projector 10.

  Next, the projector control unit of the projector 10 will be described with reference to the functional block diagram of FIG. The projection device control unit 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 projection apparatus 10, and includes a CPU, a ROM that stores operation programs such as various settings fixedly, and a RAM that is used as a work memory. ing.

  By this control means, image signals of various standards input from the input / output connector unit 21 are imaged 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 into a 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 driving unit 26.

  The display driving unit 26 functions as a display element control unit, and drives the display element 51 that is a spatial light modulation element (SOM) at an appropriate frame rate in accordance with the image signal output from the display encoder 24. Is.

  In the projection device 10, the light beam emitted from the light source device 60 is irradiated onto the display element 51 through the optical system, thereby forming an optical image with the reflected light of the display element 51, and the projection-side optical system is The image is projected and displayed on a screen (not shown). 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 encoding, and sequentially written in a memory card 32 that is a detachable recording medium. .

  Further, the image compression / decompression unit 31 reads the image data recorded on the memory card 32 in the reproduction mode, decompresses each image data constituting a series of moving images in units of one frame, and converts the image data into an image conversion Based on the image data that is output to the display encoder 24 via the unit 23 and stored in the memory card 32, a process for enabling display of a moving image or the like is performed.

  Then, the operation signal of the key / indicator unit 37 constituted by the main key and the indicator provided on the upper case 11 of the casing is directly sent to the control unit 38, and the 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 unit, 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 emission of the red light source device, the green light source device, and the blue light source device of the light source device 60 is individually controlled.

  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 based on the temperature detection result. Further, the control unit 38 causes the cooling fan drive control circuit 43 to maintain the rotation of the cooling fan even after the projection apparatus 10 body is turned off by a timer or the like, or depending on the result of temperature detection by the temperature sensor, Control such as turning off the power is also performed.

  Next, the internal structure of the projection apparatus 10 will be described. FIG. 3 is a schematic plan view showing the internal structure of the projection apparatus 10. The projection device 10 includes a light source device 60 in the central portion, and a lens barrel 225 of the projection-side optical system 220 on the left side of the light source device 60. In addition, the projection apparatus 10 includes a display element 51 such as a DMD between the lens barrel 225 and the rear panel 13. The projection device 10 includes a heat sink 191 that cools the display element 51 between the display element 51 and the back panel 13. Further, the projection device 10 includes a main control circuit board below the light source device 60.

  The light source device 60 includes a green light source device 80 that emits green wavelength band light, a red light source device 120 that emits red wavelength band light, a blue light source device 300 that emits blue wavelength band light, and a light guide optical system 140. , Is formed by. The green light source device 80 is formed by the excitation light irradiation device 70 and the fluorescent screen device 100.

  The excitation light irradiation device 70 is disposed in the vicinity of the rear panel 13 at the approximate center in the left-right direction of the projection device 10. The excitation light irradiation device 70 includes a blue laser diode 71 that is two semiconductor light emitting elements. The two blue laser diodes 71 are arranged side by side so that the optical axis is perpendicular to the rear panel 13. A heat sink 81 is disposed between the blue laser diode 71 and the back panel 13. On the optical axis of each blue laser diode 71, a collimator lens 73 for converting each of the blue laser diodes 71 into parallel light is arranged so as to enhance the directivity of the emitted light from each blue laser diode 71. A cooling fan 261 is disposed between the heat sink 81 and the back panel 13. The blue laser diode 71 is cooled by the cooling fan 261 and the heat sink 81.

  The fluorescent plate device 100 is disposed in the vicinity of the front panel 12 on the optical path of the excitation light emitted from the excitation light irradiation device 70. The fluorescent plate device 100 is a fluorescent plate 101 that is a fluorescent wheel arranged so as to be parallel to the front panel 12, that is, orthogonal to the optical axis of the emitted light from the excitation light irradiation device 70, and the fluorescent plate 101 is rotated. A driving motor 110 and a condensing lens group 111 that condenses the light bundle of excitation light emitted from the excitation light irradiation device 70 on the fluorescent plate 101 and condenses the light bundle emitted from the fluorescent plate 101 toward the rear panel 13. And comprising. A cooling fan 261 is disposed between the motor 110 and the front panel 12, and the fluorescent plate device 100 and the like are cooled by the cooling fan 261.

  The fluorescent plate 101 is formed with a fluorescent emission region that receives emission light from the excitation light irradiation device 70 via the condenser lens group 111 as excitation light and emits fluorescent light of green wavelength band. The substrate of the fluorescent plate 101 is a metal substrate made of copper, aluminum, or the like. An annular groove is formed on the surface of the substrate on the side of the excitation light irradiation device 70, and the bottom of the groove is formed by silver evaporation or the like. The mirror is processed, and a green phosphor layer is laid on the mirrored surface.

  When the green phosphor layer of the phosphor plate 101 is irradiated with blue wavelength band light as excitation light from the excitation light irradiation device 70, the green phosphor in the green phosphor layer is excited and green. Green wavelength band light is emitted in all directions from the phosphor. The fluorescent light beam is emitted toward the rear panel 13 and enters the condenser lens group 111.

   The red light source device 120 includes a red light source 121 and a condensing lens group 125 that condenses light emitted from the red light source 121. The red light source 121 is a red light emitting diode that is a semiconductor light emitting element that emits light in a red wavelength band. In the red light source device 120, the optical axis of the red wavelength band light emitted from the red light source 121 of the red light source device 120 is emitted from the optical axis of the blue wavelength band light emitted from the blue light source device 300 and the fluorescent plate 101. Thus, they are arranged so as to intersect the optical axis of green wavelength band light reflected by a first dichroic mirror 141 described later. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the rear panel 13 side of the red light source 121. A cooling fan 261 is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 261 and the heat sink 130.

  The blue light source device 300 is disposed at a substantially central position in the front-rear direction of the projection device 10 in the vicinity of the right panel 14. The blue light source device 300 includes a blue laser diode 301 that is a semiconductor light emitting element, and a light shaping unit 320 that receives light from the blue laser diode 301 and shapes and emits the light. The optical axis of the emitted light from the blue laser diode 301 emitted through the light shaping unit 320 is emitted toward the left panel 15 so as to be parallel to the front panel 12. Therefore, the emitted light from the blue light source device 300 is orthogonal to the emitted light from the excitation light irradiation device 70, the emitted light from the fluorescent plate device 100, and the emitted light from the red light source device 120.

  Here, the light shaping unit 320 is provided with a plurality of shaping lenses in the optical axis direction. Specifically, the first shaping lens 330 is disposed on the emission side of the blue laser diode 301, and the second shaping lens 340 is disposed on the emission side of the first shaping lens 330. Further, a heat sink 190 is disposed on the right panel 14 side of the blue light source device 300.

  Between the cooling fan 261 on the front panel 12 side of the fluorescent plate device 100 and the front panel 12, the position on the front panel 12 side of the cooling fan 261 extends from the front panel 12 side of the heat sink 190 in the vicinity of the right panel 14. A heat sink 135 is disposed. A cooling fan 261 is disposed between the heat sink 135 and the front panel 12 in the vicinity of the right panel 14. The heat sinks 135 and 190 are cooled by the cooling fan 261.

  The light guide optical system 140 includes a condensing lens that condenses the light bundles of the red, green, and blue wavelength bands, and a reflection mirror that converts the optical axes of the light bundles of the respective color wavelength bands into the same optical axis, It consists of a dichroic mirror. Specifically, the optical axis of the blue wavelength band light emitted from the blue light source device 300, the blue wavelength band light emitted from the excitation light irradiation device 70, and the optical axis of the green wavelength band light emitted from the fluorescent plate device 100 And a first dichroic mirror 141 that transmits the blue wavelength band light, reflects the green wavelength band light, and converts the optical axis of the green light by 90 degrees toward the left panel 15 is disposed Has been. By the first dichroic mirror 141, the optical axis of the blue wavelength band light emitted from the blue light source device 300 and the optical axis of the green wavelength band light emitted from the fluorescent plate device 100 are made the same optical axis.

  An optical axis of blue wavelength band light emitted from the blue light source device 300 that passes through the first dichroic mirror 141 and an optical axis of green wavelength band light emitted from the fluorescent plate device 100 reflected by the first dichroic mirror 141 The red wavelength band light and the green wavelength band light are transmitted at a position where the optical axis of the red wavelength band light emitted from the red light source device 120 intersects at right angles, and the red wavelength band light is reflected to reflect this red color. A second dichroic mirror 142 that converts the optical axis of light by 90 degrees in the direction of the left panel 15 is disposed. By the second dichroic mirror 142, the optical axis of the blue wavelength band light emitted from the blue light source device 300, the optical axis of the green wavelength band light emitted from the fluorescent plate device 100, and the red wavelength emitted from the red light source device 120. The optical axis of the band light is the same optical axis.

  A diffusion plate 144 is disposed on the left panel 15 side of the second dichroic mirror 142. Each color wavelength band light is diffused by the diffusion plate 144. A microlens array 145 is disposed on the left panel 15 side of the diffusion plate 144. The microlens array 145 further diffuses each color wavelength band light and superimposes the light transmitted through each microlens array 145 to make the intensity distribution in each wavelength band light uniform.

  The microlens in the present embodiment is a lens in which biconvex lenses having a horizontally long rectangular shape in a plan view are arranged in a lattice shape. A condensing lens 147 is disposed on the left panel 15 side of the microlens array 145. The condensing lens 147 condenses the diffused uniform light transmitted through the microlens array 145 to the effective size of the display element 51. In this way, the light guide optical system 140 is formed by the first dichroic mirror 141, the second dichroic mirror 142, the diffusion plate 144, the microlens array 145, and the condenser lens 147.

  The light source side optical system 170 disposed on the back panel 13 side near the left panel 15 is provided with an optical axis conversion mirror 173 and a condenser lens 174. The condenser lens 174 collects the light emitted from the display element 51 and makes it incident on the lens barrel 225, and thus is also one of the components of the projection-side optical system 220.

  Light emitted from the light source device 60 is emitted to an optical axis conversion mirror 173 disposed in the vicinity of the left panel 15. On the other hand, a condenser lens 174 is provided in front of the display element 51. Therefore, the light source light reflected by the optical axis conversion mirror 173 is effectively applied to the display element 51 by the condenser lens 174.

  The on-light reflected by the display element 51 is emitted to the screen by the projection-side optical system 220 as projection light. The lens barrel 225 of the projection side optical system 220 is a variable focus type lens having a zoom function with a fixed lens group and a movable lens group 235 built in the lens barrel 225. The movable lens group 235 can perform zoom adjustment and focus adjustment using a lens motor as a drive source.

  By configuring the projection device 10 in this manner, when the fluorescent plate 101 that is a fluorescent wheel is rotated and light is emitted from the excitation light irradiation device 70, the red light source device 120, and the blue light source device 300 at different timings, red, green And blue wavelength band lights are incident on the display element 51 via the light guide optical system 140 and the light source side optical system 170, so that the DMD which is the display element 51 of the projection apparatus 10 emits light of each color according to data. By performing time-division display, a color image can be projected on the screen.

  Here, in general, a laser diode has different emission angles in a vertical direction and a horizontal direction with respect to a junction surface of the diode. For this reason, as shown in FIG. 4, it is known that the cross section of the laser light emitted from the laser diode has an elliptical shape (the elliptical cross section P shown in FIG. 4). Here, for the following explanation, the major axis direction of the elliptical cross section P in the emitted light from the blue laser diode 301 of the blue light source device 300 is the x axis, the minor axis direction is the y axis, and the optical axis of the laser beam is It is defined as the z axis.

  According to the definition of each axis, FIG. 3 shows an arrangement in the yz plane. Therefore, the blue laser diode 301 is disposed so that the major axis direction (x-axis direction) of the elliptical cross section P in the laser light emitted from the blue laser diode 301 is perpendicular to the paper surface. In the following description, the description will be made based on the above xyz axis system in accordance with the arrangement of the blue laser diode 301 shown in FIG.

  5A and 5B show the blue laser diode 301 of the blue light source device 300 in which the first dichroic mirror 141 and the second dichroic mirror 142 in the optical path from the light shaping unit 320 to the diffuser 144 in FIG. 3 are omitted. FIG. 6 is a schematic diagram showing a state in which laser light emitted from the light enters a microlens array 145. FIG. 5A shows the yz plane, and FIG. 5B shows the xz plane.

  As shown in FIGS. 5A and 5B, a light shaping unit 320 is disposed on the emission side of the blue laser diode 301. The light shaping unit 320 includes a first shaping lens 330 disposed on the incident side of the light shaping unit 320 (in other words, the emission side of the blue laser diode 301) and the emission side of the light shaping unit 320 (in other words, the first And a second shaping lens 340 disposed on the emission side of the one shaping lens 330. The first shaping lens 330 includes an incident surface 331 on which light is incident on the first shaping lens 330 and an emission surface 335 on which light transmitted through the first shaping lens 330 is emitted. The incident surface 331 is formed with a cylindrical concave shape 332 whose longitudinal direction is the x-axis direction. A spherical shape 336 that is an axially symmetric shape is formed on the emission surface 335.

  Similarly to the first shaping lens 330, the second shaping lens 340 also has a cylindrical concave shape 342 formed on the incident surface 341 and a spherical shape 346 formed on the exit surface 345. In this embodiment, the curvatures of the cylindrical concave shape 332 of the first shaping lens 330 and the cylindrical concave shape 342 of the second shaping lens 340 are different from each other, and the spherical shape of the emission surface 345 of the second shaping lens 340 is formed. 346 has a larger diameter than the spherical shape 336 of the exit surface 335 of the first shaping lens 330.

  Here, the laser light LR emitted from the blue laser diode 301 has an elliptical cross section P as described above, and is arranged such that its major axis direction coincides with the x-axis direction (see FIG. 4). Therefore, the major axis direction of the elliptical cross section P in the blue laser diode 301, the longitudinal direction of the cylindrical concave shape 332 of the first shaping lens 330, and the longitudinal direction of the cylindrical concave shape 342 of the second shaping lens 340 are the x-axis direction. Have been a match. The optical axis of the laser beam LR and the optical axis of the light shaping unit 320 (the first shaping lens 330 and the second shaping lens 340) coincide with each other.

  The laser beam LR emitted from the blue laser diode 301 is incident on the incident surface 331 of the first shaping lens 330 and is emitted from the spherical shape 336 of the emission surface 335. The laser beam LR emitted from the emission surface 335 of the first shaping lens 330 is incident on the incident surface 341 of the second shaping lens 340 and is emitted from the emission surface 345. The laser beam LR emitted from the emission surface 345 passes through the first dichroic mirror 141 and the second dichroic mirror 142 (see FIG. 3), and after the speckle noise is removed by the diffusion plate 144, enters the microlens array 145. To do.

  Here, as shown in FIG. 5A, the minor axis direction (y-axis direction) of the elliptical cross section P in the laser light LR is the incidence surfaces 331 and 341 of the first shaping lens 330 and the second shaping lens 340. The light is sequentially expanded by the cylindrical concave shapes 332 and 342 and is emitted from the emission surface 345 of the second shaping lens 340. The minor axis direction (y-axis direction) of the elliptical cross section P in the laser beam LR emitted from the emission surface 345 is shaped and emitted as light having an effective angle and range with respect to the microlens array 145.

  On the other hand, as shown in FIG. 5B, the major axis direction (x-axis direction) of the elliptical cross section P in the laser light LR is the spherical surfaces of the emission surfaces 335 and 345 of the first shaping lens 330 and the second shaping lens 340. Due to the shapes 336 and 346, the light becomes substantially parallel light and is emitted from the emission surface 345 of the second shaping lens 340.

  As shown in FIG. 6, the laser light LR emitted from the light shaping unit 320 is shaped into a substantially circular laser light LR indicated by a solid line with a cross-sectional elliptical shape P indicated by a two-dot chain line, as shown in FIG. 145 is incident. Therefore, since the number of divisions when the laser beam LR passes through the microlens array 145 can be increased, the illuminance at the central portion and the peripheral portion of the laser beam LR is evenly applied to the display element 51. Therefore, the luminance unevenness of the image light emitted from the display element 51 is suppressed. Furthermore, since the green wavelength band light emitted from the fluorescent plate device 100 and the red wavelength band light emitted from the red light source device 120 are diffused by the diffusion plate 144 and incident on the microlens array 145, the laser light in FIG. It is assumed that the light beam has substantially the same shape as that of the substantially circular light beam of the LR. Therefore, color unevenness in the central portion and the portion other than the central portion in the image light projected on the screen is suppressed.

  In the present embodiment, as shown in FIG. 5A, the major axis direction (x-axis direction) of the laser light LR emitted from the light shaping unit 320 is a predetermined effective angle with respect to the microlens array 145. However, it can be set so as to be approximately parallel light. Further, the emission surfaces 335 and 345 can be formed so that the laser light LR emitted from the light shaping unit 320 has a spread angle of about several degrees in both the x-axis direction and the y-axis direction.

  In addition, the light shaping unit 320 includes two shaping lenses (the first shaping lens 330 and the second shaping lens 340). However, the present invention is not limited to this, and it is sufficient that at least one shaping lens is provided. . However, when there is one shaping lens, the curvature of the cylindrical concave shape on the incident surface of the shaping lens becomes large. Accordingly, since aberration increases and efficiency decreases, it may be necessary to increase the thickness of the shaping lens, or to form it with a glass material having a high refractive index. The light shaping unit 320 can also be formed by combining one or more shaping lenses and another optical device such as one or more condenser lenses.

  In the present embodiment, the spherical surfaces 336 and 346 are formed on the exit surfaces 335 and 345 of the shaping lenses (the first shaping lens 330 and the second shaping lens 340). For example, an aspherical shape may be used. FIG. 7 shows a light shaping unit 420 including a shaping lens 430 in which an aspherical shape 436 is formed on the emission surface 435 instead of the light shaping unit 320 of the present embodiment. The shaping lens 430 is formed with a cylindrical concave shape 432 whose longitudinal direction is the x-axis direction on the incident surface 431 as in the above-described embodiment.

  In this modification, only one shaping lens 430 is disposed in the light shaping unit 420. However, the shaping lens (the first shaping lens 330, the second shaping lens 340), the plano-convex lens, etc. having the spherical shape described above. Can be arranged in combination.

  As described above, according to the embodiment of the present invention, the light source device 60 includes the blue laser diode 301 that is a semiconductor light emitting element, and the blue light source devices 300 and 300 </ b> A including the light shaping units 320 and 420. The light shaping units 320 and 420 include a shaping lens (a first shaping lens 330, a second shaping lens 340, or a shaping lens 430). Cylindrical concave shapes 332, 342, and 432 are formed on the incident surfaces 331, 341, and 431 of the shaping lens. Axisymmetric shapes (spherical shape 336, 346, aspherical shape 436) are formed on the exit surfaces 335, 345, 435 of the shaping lens. In addition, light emitted from the blue laser diode 301 which is a semiconductor light emitting element has an elliptical cross section P. The blue laser diode 301 and the shaping lens (the first shaping lens 330, the second shaping lens 340, or the shaping lens 430) are arranged so as to have the major axis direction of the elliptical cross section P and the cylindrical concave shapes 332, 342, and 432. The

  Thereby, the light having the elliptical cross section P emitted from the blue laser diode 301 can be shaped into a substantially circular shape by the light shaping sections 320 and 420. Then, the emitted light from the blue laser diode 301 having a substantially circular shape can be incident on the microlens array 145. Therefore, the light source light emitted to the display element 51 can be made uniform, and the image light emitted from the display element 51 can reduce the difference in luminance between the central portion and the peripheral portion. Color unevenness and luminance unevenness of the projected image light can be reduced.

  The light shaping unit 320 may include a plurality of shaping lenses (first shaping lens 330 and second shaping lens 340) in the optical axis direction. As a result, the elliptical laser beam emitted from the blue laser diode 301 can be shaped into a substantially circular shape in sequence. Therefore, since the individual shaping lenses can be made thin or formed with a low refractive index, the cost for manufacturing the individual shaping lenses can be reduced.

  In addition, the light shaping units 320 and 420 may be a plano-convex lens into which light from the shaping lens (the first shaping lens 330, the second shaping lens 340, or the shaping lens 430) is incident. As a result, the laser beam can be adjusted in accordance with the optical device in the optical path after the light shaping sections 320 and 420. For example, when the light is incident on the microlens array 145, the light emitted from the light shaping units 320 and 420 can have an effective angle and range with respect to the microlens array 145.

  In addition, spherical shapes 336 and 346 are formed as axially symmetric shapes on the emission surfaces 335 and 345 of the first shaping lens 330 and the second shaping lens 340 of the light shaping unit 320. Thereby, it can reduce the cost concerning manufacture of a shaping lens as a spherical shape which can reduce cost especially among the axially symmetric shapes which are easy to manufacture.

  In addition, an aspherical shape 436 is formed as an axially symmetric shape on the emission surface 435 of the shaping lens 430 of the light shaping unit 420. Thereby, the number of lenses arranged in the light shaping unit 420 can be reduced, and various aberrations of the laser light can be reduced.

  In addition, the light source device 60 can include a microlens array 145 into which light from the light shaping units 320 and 420 is incident. Accordingly, since the microlens array 145 is irradiated with substantially circular light with an expanded irradiation range of the laser light, the laser light can be split through more microlenses. Therefore, the light source device 60 can emit light source light having a uniform intensity distribution.

  In the light source device 60, the blue light source device 300 includes the blue laser diode 301. As a result, with respect to the laser light from the blue laser diode 301, the light source device 60 can be obtained in which the irradiation range can be expanded and the size can be reduced while the cross-sectional shape of the laser light is substantially circular and the emission angle with respect to the optical axis is shaped symmetrically. Can do.

  The projection device 10 is formed by the light source device 60, the display element 51, the projection-side optical system 220, and the projection device control unit. Thereby, since the illuminance distribution can be made uniform with respect to the laser light from the bright blue laser diode 301, it is possible to obtain the projection device 10 capable of reducing the color unevenness and the illuminance unevenness and projecting a clear projection image. it can.

  The embodiment described above is presented as an example, and is 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 semiconductor light emitting device;
A light shaping unit that receives light from the semiconductor light emitting element and shapes and emits the light; and
Have
The light shaping unit has a shaping lens including an incident surface on which a cylindrical concave shape is formed and an emission surface on which an axially symmetric shape is formed,
The light from the semiconductor light emitting element has an elliptical cross section,
The light source device, wherein the semiconductor light emitting element and the shaping lens are arranged such that a major axis direction of the elliptical cross section coincides with a longitudinal direction of the cylindrical concave shape.
[2] The light source device according to [1], wherein the light shaping unit includes a plurality of shaping lenses arranged in an optical axis direction.
[3] The light source device according to [1] or [2], wherein the light shaping unit includes a plano-convex lens into which light from the shaping lens is incident.
[4] The light source device according to any one of [1] to [3], wherein the axially symmetric shape is a spherical shape.
[5] The light source device according to any one of [1] to [4], wherein the axially symmetric shape is an aspherical shape.
[6] The light source device according to any one of [1] to [5], further including a microlens array on which light from the light shaping unit is incident.
[7] The light source device according to any one of [1] to [6], wherein the semiconductor light emitting element is a laser diode.
[8] The light source device according to any one of [1] to [7],
A display element that is irradiated with light source light from the light source device to form image light;
A projection-side optical system that projects the image light emitted from the display element onto a screen;
The display element; and a projector control unit that controls the light source device;
A projection apparatus comprising:

DESCRIPTION OF SYMBOLS 10 Projector 11 Upper case 12 Front panel 13 Rear panel 14 Right panel 15 Left panel 16 Lower case 17 Exhaust hole 21 Input / output connector part 22 Input / output interface 23 Image conversion part 24 Display encoder 25 Video RAM 26 Display drive part 31 Image compression / Expansion unit 32 Memory card 35 Ir receiving 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 Irradiation device 71 Blue laser diode 73 Collimator lens 80 Green light source device 81 Heat sink 100 Fluorescent plate device 101 Fluorescent plate 110 Motor 111 Condensing lens group 120 Red light source device 121 Red light source 125 Condensing lens group 130 Tosync 135 Heat sink 140 Light guide optical system 141 First dichroic mirror 142 Second dichroic mirror 144 Diffuser 145 Micro lens array 147 Condensing lens 170 Light source side optical system 173 Optical axis conversion mirror 174 Condenser lens 190 Heat sink 191 Heat sink 220 Projection side optical System 225 Lens barrel 235 Movable lens group 261 Cooling fan 300 Blue light source device 300A Blue light source device 301 Blue laser diode 320 Light shaping unit 330 First shaping lens 331 Incident surface 332 Cylindrical concave shape 335 Outgoing surface 336 Spherical shape 340 Second shaping Lens 341 Incident surface 342 Cylindrical concave shape 345 Output surface 346 Spherical shape 420 Light shaping unit 430 Shaping lens 431 Incident surface 432 Cylindrical concave Jo 435 exit surface 436 aspheric

Claims (8)

A semiconductor light emitting device;
A light shaping unit that receives light from the semiconductor light emitting element and shapes and emits the light; and
Have
The light shaping unit has a shaping lens including an incident surface on which a cylindrical concave shape is formed and an emission surface on which an axially symmetric shape is formed,
The light from the semiconductor light emitting element has an elliptical cross section,
The light source device, wherein the semiconductor light emitting element and the shaping lens are arranged such that a major axis direction of the elliptical cross section coincides with a longitudinal direction of the cylindrical concave shape.   The light source device according to claim 1, wherein the light shaping unit includes a plurality of shaping lenses arranged in an optical axis direction.   The light source device according to claim 1, wherein the light shaping unit includes a plano-convex lens into which light from the shaping lens is incident.   The light source device according to claim 1, wherein the axially symmetric shape is a spherical shape.   The light source device according to claim 1, wherein the axially symmetric shape is an aspherical shape.   6. The light source device according to claim 1, further comprising a microlens array into which light from the light shaping unit is incident.   The light source device according to claim 1, wherein the semiconductor light emitting element is a laser diode. A light source device according to any one of claims 1 to 7,
A display element that is irradiated with light source light from the light source device to form image light;
A projection-side optical system that projects the image light emitted from the display element onto a screen;
The display element; and a projector control unit that controls the light source device;
A projection apparatus comprising:

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