JP6245469B2 - Light source unit and projector - Google Patents

Description

The present invention relates to a light source unit having a fluorescent plate that emits light by excitation light, and a projector including the light source unit.

  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. Conventionally, such projectors mainly use a high-intensity discharge lamp as a light source, but in recent years, light-emitting diodes (LEDs), laser emitters, organic ELs, or phosphors as light-emitting elements of light source devices. There have been many developments and proposals using the above.

  For example, red, green, and blue phosphor layers are arranged side by side on the surface of a fluorescent plate made of a translucent disc, and a dichroic filter that transmits ultraviolet light and reflects visible light is disposed on the back surface of the fluorescent plate. There has been proposed a light source device that generates light sources of red, green, and blue wavelength bands by irradiating a phosphor layer with ultraviolet light from the side (Patent Document 1).

  In the previous application, the applicant of the present application has proposed a light source device including a laser emitter as an excitation light source and a fluorescent plate having a phosphor layer formed on a reflection surface (Patent Document 2). ). In this light source device, a laser beam from a laser emitter is irradiated onto a phosphor layer through a microlens array, and emitted from a red light emitting diode or a blue light emitting diode together with green fluorescent light emitted from the phosphor of the phosphor layer. The red light and the blue light are irradiated onto a display element such as a DMD through a macro lens array.

JP 2004-341105 A JP 2011-197597 A

  As described above, it is assumed that the surface density of the light beam is made uniform by the micro lens array, and the phosphor is irradiated with the excitation light by using the micro lens array, and the red light, the green light, and the blue light are also other micro lens arrays. The light source unit that uniformizes the light flux of each primary color light can be made a small light source device, but the number of components of the light source unit increases, and each component of the light source unit incorporated in the projector etc. There has been a drawback that it is difficult to adjust the arrangement of.

  The present invention eliminates such drawbacks, and is a light source device that can be assembled into a light source unit that is easy to assemble, and a small projector including the small light source device. Thus, a projector capable of projecting with high brightness and less unevenness in the projected image is provided.

According to one aspect of the present invention, the light source unit includes an excitation light source for emitting excitation light and a fluorescent material and a microlens array, and the dichroic mirror to the excitation light emission side of the microlens array, a pre-Symbol excitation Okoshiko, the irradiates the incident from one surface passes through the microlens array the phosphor of the microlens array, fluorescent light emitted from the phosphor, the other of the microlens array An optical axis of a light beam of a wavelength band light having a wavelength band different from that of the fluorescent light is incident from a surface and is parallel to the optical axis of the fluorescent light by the dichroic mirror. light beam of a different wavelength band wavelength band is incident on the microlens array from the fluorescent light on the same side, especially that passes through the microlens array To.
According to another aspect of the present invention, the light source unit includes an excitation light source that emits excitation light, a phosphor and a microlens array, and excitation light reflection provided on the excitation light incident side of the microlens array. And the excitation light is incident on one surface of the microlens array through the excitation light reflecting mirror, passes through the microlens array, and is irradiated on the phosphor. The fluorescent light emitted from the microlens array is incident on the other surface of the microlens array and passes through the microlens array.
Furthermore, according to another aspect of the present invention, the light source unit includes an excitation light source that emits excitation light, a phosphor, and a microlens array, and the excitation light is incident from one surface of the microlens array. Then, the fluorescent light transmitted through the microlens array is irradiated onto the phosphor, and the fluorescent light emitted from the phosphor enters from the other surface of the microlens array, passes through the microlens array, and the microlens array. The lens array is configured such that a region where the excitation light is incident is different from a region where the fluorescence light is incident, and the region where the excitation light is incident is different from the region where the fluorescence light is incident. It is characterized by being different.

  The projector according to the present invention includes the light source unit according to the present invention, a display element that generates projection light, a light guide optical system that guides light emitted from the light source unit to the display element, and the display. A projection optical system that guides the projection light generated by the element, and a projector control unit that controls the display element and the light source unit.

  According to the present invention, it is easy to assemble a light source unit, and a light source device that can be a small light source unit, and a compact light source that can project a bright image without luminance unevenness by including the light source unit. And a projector.

1 is an external perspective view showing an example of an embodiment of a projector according to the present invention. It is a figure which shows the example of the functional block of the projector which concerns on this invention. FIG. 2 is a schematic plan view showing an example of an internal structure with an upper case removed of a projector according to the present invention. It is a schematic diagram which shows 1st Example of the light source unit which concerns on this invention. It is the front schematic diagram and cross-sectional schematic diagram of the microlens array used for the light source unit of this invention. It is a schematic diagram which shows 2nd Example of the light source unit which concerns on this invention. It is a schematic diagram which shows 3rd Example of the light source unit which concerns on this invention. It is a schematic diagram which shows 4th Example of the light source unit which concerns on this invention. It is a schematic diagram which shows 5th Example of the light source unit which concerns on this invention.

  Hereinafter, modes for carrying out the present invention will be described. The projector 1 according to the present invention includes a light source unit 60, a display element 51, a projection optical system that projects projection light generated by the display element 51 on a screen, and light emitted from the light source unit 60 to the display element 51. A light guide optical system 170 that emits light and matches the projection light generated by the display element 51 with the optical axis of the projection optical system; and a projector control unit that controls the light source unit 60, the display element 51, and the like.

  The light source unit 60 includes an excitation light irradiation device 70 serving as a green light source device, a fluorescent light emitting device 100 that emits fluorescent light in the green wavelength band in response to light emitted from the excitation light irradiation device 70, and red wavelength band light. A red light source device 120 that emits light, a blue light source device 140 that emits light in the blue wavelength band, and a light source optical system that converts light in each wavelength band of red, green, and blue into optical axes in the same direction and emits them from the light source unit 60 150.

  The light source optical system 150 includes one microlens array 151, an excitation light reflecting mirror that reflects excitation light from one surface of the microlens array 151, and excitation light that has passed through the microlens array 151. Reflected in the direction of the fluorescent light emitting device 100, reflected the fluorescent light emitted from the fluorescent light emitting device 100 so as to enter from the other surface of the microlens array 151, and from the red light source device 120 and the blue light source device 140 A dichroic mirror 155 that transmits the emitted light and enters the microlens array 151 is provided.

  In the microlens array 151, a plurality of microconvex lenses 151a having a shape similar to the shape of the phosphor layer of the fluorescent plate 101 and the display element 51 in the fluorescent light emitting device 100 are arranged in a matrix, and each light beam transmitted through the microconvex lens 151a is transmitted. The bundle is irradiated on the phosphor layer by the condensing lens 110 so that the center position overlaps on the phosphor layer.

  Further, the light emitted from the fluorescent light emitting device 100, the red light source device 120, and the blue light source device 140 also passes through the microlens array 151 to become a rectangular light bundle of each microconvex lens 151a, and each light beam transmitted through the microconvex lens 151a. The bundle is irradiated onto the display element 51 by the condenser lens 172 so that the center position overlaps on the display element 51.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an external perspective view of the projector 1. In the present embodiment, left and right in projector 1 indicate the left and right direction with respect to the projection direction, and front and rear indicate the projection direction of projector 1 and the front and rear direction with respect to the traveling direction of the light beam.

  As shown in FIG. 1, the projector 1 is a small-sized projector 1 having a substantially rectangular parallelepiped shape, and is configured to cover the inside with an upper case 5 and a lower case 6. The front plate 12 formed by fitting the upper case 5 and the lower case 6 positioned in front of the projector housing has a lens barrel 225 disposed substantially at the center and an intake hole 18 in the vicinity of the right plate 15. Is formed.

  Further, a key / indicator portion 37 is provided on the upper plate 11 formed by the upper case 5 of the projector housing. The key / indicator portion 37 has a power switch key and a power indicator for notifying whether the power is on or off. There are arranged keys and indicators such as a projection switch key for switching projection on and off, an overheat indicator for notifying when a light source unit, a display element, a control circuit or the like is overheated. Furthermore, the back plate 13 and the right plate 15 formed by fitting the upper case 5 and the lower case 6 located at the rear or side of the projector housing have a USB terminal, a power adapter plug, a memory card insertion slot, etc. Various terminals are provided.

  Next, projector control means of the projector 1 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 1, and includes a CPU as an arithmetic unit, a ROM that stores operation programs such as various settings in a fixed manner, and a RAM that is used as a work memory. It is comprised by.

  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. Is.

  In the projector 1, the light bundle emitted from the light source unit 60, that is, the light bundle condensed in a predetermined direction by the light source optical system 150 of the light source unit 60 is applied to the display element 51 through the light guide optical system 170. By irradiating, an optical image is formed by the reflected light of the display element 51, and an image is projected and displayed on a screen (not shown) via a projection optical system described later. The movable lens group 235 of the projection optical system is driven by the lens motor 45 for zoom adjustment and focus adjustment.

  The image compression / decompression unit 31 reads the image data recorded on the memory card 32 at the time of reproduction, decompresses individual image data constituting a series of moving images in units of one frame, and outputs the image data to the image conversion unit 23. Through the display encoder 24 and based on the image data stored in the memory card 32, a process for enabling display of a moving image or the like is performed.

  Then, an operation signal from the key / indicator unit 37 provided in the upper case 5 of the housing is directly sent 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.

  The control unit 38 controls a light source control circuit 41 as a light source control means. The light source control circuit 41 includes the excitation light irradiation device 70, the red light source device 120, and the blue light source device 140 of the light source unit 60 so that the light source light of a predetermined wavelength band required at the time of image generation is emitted from the light source unit 60. Control light emission individually. 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 unit 60 and the like, and controls the rotation speed of the cooling fan from the result of the temperature detection.

  Further, the projector control means includes an illuminance sensor 42 as illuminance measurement means for measuring the illuminance of the emitted light from the light source unit 60. Then, the control unit 38 adjusts the voltage applied to each light source of the light source unit 60 based on the information regarding the output of each wavelength band light transmitted from the illuminance sensor 42, and maintains the luminance balance. .

  Next, the internal structure of the projector 1 will be described. FIG. 3 is a schematic plan view showing the internal structure of the projector 1. As shown in FIG. 3, the projector 1 includes a light source unit 60 at the center, and a lens barrel 225 with a projection optical system built in the left side of the light source unit 60. A battery 55 is provided between the two. In addition, the projector 1 includes a display element 51 such as a DMD disposed in parallel with the left side plate 14 in the vicinity of the battery 55 between the lens barrel 225 and the back plate 13. Further, the projector 1 includes a main control circuit board 241 below the light source unit 60, and a power control circuit board 242 between the lens barrel 225 and the battery 55.

  In addition, the projector 1 includes a light guide optical system 170 between the light source unit 60 and the display element 51, and the light emitted from the light source unit 60 is condensed by the condensing lens 172 by the light guide optical system 170 to be a prism. The optical axis of the on-light irradiated to the display element 51 through 175 and reflected by the display element 51 is made coincident with the optical axis of the projection optical system by the prism 175 and emitted toward the projection optical system.

  Between the light source unit 60 and the right side plate 15, a power connector 57, a heat sink 190 for a red light source 121 and a blue light source 141 to be described later, an excitation light source 71 and a fluorescent plate 101 to be described later are arranged in this order from the rear plate 13 side. The heat pipe 130 and the cooling fan 261 that guide the generated heat to the heat sink 190 are provided.

  The light source unit 60 includes the excitation light irradiation device 70 disposed near the lens barrel 225 and near the center of the projector 1 and the fluorescent light emitting device 100 disposed near the center of the projector 1 near the cooling fan 261. The green light source device according to the above, the blue light source device 140 and the red light source device 120 arranged in the vicinity of the power supply connector 57 and in the vicinity of the back plate 13, the back of the excitation light irradiation device 70 and the fluorescent light emitting device 100, In addition, a light source optical system 150 disposed near the back plate 13 between the blue light source device 140 and the red light source device 120 and the light guide optical system 170 is provided.

  The excitation light irradiation device 70 includes two excitation light sources 71 whose optical axes are parallel to the left side plate 14 and emit light in the direction of the back plate 13, and two units arranged on the optical axis of each excitation light source 71. A collimator lens 73. The excitation light source 71 is a blue laser light emitter, and emits a laser beam in a blue wavelength band toward the excitation light reflecting mirror 161 of the light source optical system 150 disposed behind the excitation light irradiation device 70.

  The collimator lens 73 irradiates the light emitted from the excitation light source 71 so as to be slightly diffused as a substantially parallel light beam. Further, the excitation light source 71 is in contact with the heat pipe 130 via the substrate for the excitation light source 71, and is cooled by the heat sink 190 via the heat pipe 130.

  The fluorescent light emitting device 100 includes a fluorescent plate 101 and a condensing lens 110 disposed behind the fluorescent plate 101. The fluorescent plate 101 is a rectangular flat plate whose surface is mirror-finished, and is arranged in parallel with the front plate 12, and a rectangular green phosphor layer is laid on the mirror surface. The green phosphor layer is formed from a binder such as a silicon resin having high heat resistance and high translucency, and a green phosphor uniformly dispersed in the binder.

  The fluorescent plate 101 in which the phosphor layer is laid on the mirror-finished flat plate uses the laser beam emitted from the excitation light source 71 as excitation light, and the fluorescent light in the green wavelength band from the phosphor in the phosphor layer as excitation light. The light exits from the same surface as the incident surface. The green phosphor layer of the fluorescent plate 101 has a similar shape to the display element 51, and the cross-sectional shape of the light beam emitted from the green phosphor layer is similar to the shape of the display element 51.

  The red light source device 120 includes a red light source 121 whose optical axis is parallel to the back plate 13 and a condensing lens 125 disposed on the optical axis of the red light source 121. The red light source 121 is a red light emitting diode, and the light emitted from the red light source 121 is emitted from the red light source device 120 as a light beam limited to a predetermined diffusion range by the condenser lens 125. The red light source 121 is cooled by the heat sink 190.

  The blue light source device 140 includes a blue light source 141 whose optical axis is parallel to the red light source device 120, and a condensing lens 145 disposed on the optical axis of the blue light source 141. The blue light source 141 is a blue light emitting diode, and the light emitted from the blue light source 141 is emitted from the blue light source 141 as a light beam limited to a predetermined diffusion range by the condenser lens 145. The light source 141 is cooled by the heat sink 190.

  The light source optical system 150 includes an excitation light reflecting mirror 161 that reflects the emitted light from the excitation light irradiation device 70 in parallel with the back plate 13 in the direction of the right side plate 15, and the excitation light reflected by the excitation light reflecting mirror 161. And a dichroic mirror 155 that reflects the excitation light transmitted through the microlens array 151 toward the front plate 12, that is, toward the fluorescent light emitting device 100.

  The excitation light reflecting mirror 161 of the light source optical system 150 reflects the blue wavelength band light and transmits the red wavelength band light and the green wavelength band light, and the dichroic mirror 155 has a back surface as shown in FIG. A first dichroic region 156 having a rear half portion on the face plate 13 side as an upper region and a second dichroic region 157 having a front half portion on the front plate 12 side as a lower region are used.

  The first dichroic region 156 that is the upper region is a region that transmits at least the blue wavelength band light and reflects the green wavelength band light, and the second dichroic region 157 that is the lower region transmits the red wavelength band light, The region reflects green wavelength band light and blue wavelength band light that is excitation light.

Then, the first dichroic region 156 is positioned on the optical axis of the blue light source device 140, the second dichroic region 157 is positioned on the optical axis of the red light source device 120, and the blue wavelength band light emitted from the blue light source device 140 is obtained. Is transmitted through the dichroic mirror 155 and the microlens array 151 and is incident on the condenser lens 172 of the light guide optical system 170,
The red wavelength band light emitted from the red light source device 120 is transmitted through the dichroic mirror 155, the microlens array 151, and the excitation light reflecting mirror 161 and is incident on the condenser lens 172 of the light guide optical system 170.

  Further, the green wavelength band light emitted from the fluorescent light emitting device 100 is reflected by the dichroic mirror 155 to be an optical axis parallel to the optical axes of the blue wavelength band light and the red wavelength band light, and is transmitted through the microlens array 151. A part of the green wavelength band light transmitted through the micro lens array 151 is directly transmitted to the condenser lens 172, and another part of the green wavelength band light transmitted through the micro lens array 151 is transmitted through the excitation light reflecting mirror 161. The light enters the condenser lens 172.

  In this way, each primary color light incident on the microlens array 151 from the surface opposite to the incident surface of the excitation light and transmitted through the microlens array 151 is incident on the condensing lens 172, and is collected by the condensing lens 172. The image forming surface of the display element 51 is irradiated so as to overlap the images of the micro convex lenses 151a of the array 151, and is incident on the display element 51 as a light beam having a uniform light density.

  In FIG. 4, the optical axis of the excitation light and each primary color light is displayed, and the laser light that is the excitation light is emitted from the collimator lens 73 in the optical axis direction as a light beam that slightly diffuses. Each primary color light of the red wavelength band light, the green wavelength band light, and the blue wavelength band light is also emitted as a light bundle that slightly diffuses around the optical axis when it is emitted from each condenser lens 125, 110, 145. Is.

  FIG. 5 is a schematic front view and a schematic cross-sectional view of the microlens array 151. As shown in FIGS. 5A and 5B, the microlens array 151 of the excitation light irradiation device 70 includes a plurality of microconvex lenses 151a arranged in a matrix. Each micro-convex lens 151a has a shape substantially similar to the shape of the green phosphor layer of the fluorescent plate 101. The light bundle incident on the microlens array 151 is converted into a plurality of light bundles by each micro convex lens 151a, and the light bundle incident on each micro convex lens 151a is converted into a light beam having a square cross section by each micro convex lens 151a. Will be converted.

  Further, the excitation light converted into a plurality of light beams having a square cross section by the microlens array 151 is condensed by the condenser lens 110 and irradiated on the green phosphor layer of the fluorescent plate 101. Then, each light bundle transmitted through each micro convex lens 151a is condensed by the condensing lens 110 so that the center position thereof is overlapped on the green phosphor layer, and each light beam having a plurality of rectangular cross sections is formed on the entire green phosphor layer. The bundles are overlapped and irradiated.

  Since each light bundle has a cross-sectional shape substantially similar to the shape of the green phosphor layer 102 by the micro convex lens 151a, the green phosphor layer is irradiated with excitation light with a uniform intensity. Can be emitted uniformly.

  In addition, the microlens array 151 in the light source optical system 150 matches the light bundles emitted from the red light source 121, the blue light source 141, and the fluorescent plate 101, which are incident from the surface opposite to the excitation light, to the shape of the display element 51. The light beam is converted into a plurality of rectangular cross-section light beams, and mixed by the microlens array 151 or the condensing lens 172 so that the central positions of the light beam bundles are superimposed on the display element 51. Then, it is converted into a light flux having a uniform intensity distribution.

  The light guide optical system 170 includes a condenser lens 172 and a prism 175. The prism 175 is an R-TIR prism, which serves as a condenser lens for irradiating the display element 51 with light source light, and the light of the projection optical system in which the projection light generated by the display element 51 is housed in the lens barrel 225. It functions as an optical axis conversion device that changes the optical axis so as to coincide with the axis.

  The projection optical system built in the lens barrel 225 includes a fixed lens group and a movable lens group. By controlling the lens motor 45 described above, the lenses in the movable lens group are operated in the optical axis direction. Provides zoom and focus functions.

  The battery 55 is a driving power source for the projector 1 and is a secondary battery that can be charged by connection with a commercial power source. As the battery 55, a secondary battery such as a lithium ion battery or a nickel metal hydride battery can be used. The projector 1 according to the present embodiment can project with the electric power of the battery 55 without connecting an electric cord or the like.

  As described above, in the projector 1 of this embodiment, the excitation light from the excitation light source 71 is disposed from one surface, so that the microlens array 151 is arranged, so that the excitation light with uniform intensity is applied to the phosphor layer of the fluorescent plate 101. Can be irradiated. Therefore, the phosphor can emit light uniformly.

  Then, the red wavelength band light from the red light source device 120, the green wavelength band light from the fluorescent light emitting device 100, and the blue wavelength band light from the blue light source device 140 are incident from the other surface of the microlens array 151, The display element 51 can be irradiated as uniform light source light through the microlens array 151 and the condenser lens 172. Therefore, it is possible to provide the projector 1 capable of high-quality projection without uneven brightness.

  Further, the excitation light reflecting mirror 161 is incident on one side of the microlens array 151 so that the excitation light is incident from one surface of the microlens array 151, and each primary color light is incident from the other surface of the microlens array 151. The dichroic mirror 155 is disposed on the other surface side, and excitation light is collected on the fluorescent plate 101 so that the images of the micro convex lenses 151a formed on the micro lens array 151 by the condenser lens 110 of the fluorescent light emitting device 100 are superimposed. Each primary color light emitted from the light source unit 60 through the microlens array 151 is condensed on the display element 51 by the condenser lens 172 of the light guide optical system 170 so that the images of the microconvex lenses 151a are superimposed. Therefore, the number of components of the light source unit 60 is reduced, the adjustment of the light collection state of the optical system is facilitated, the assembly of the light source unit 60 is facilitated, and the efficiency is improved. It can be set as a high condensing optical system.

  Further, as a second embodiment of the light source unit 60, as shown in FIG. 6, a corrected glass plate 165 is added.

  The modified glass plate 165 is a glass plate made of the same material as the base material of the excitation light reflecting mirror 161 and having the same thickness, and is arranged so as to cover an area where the excitation light reflecting mirror 161 does not overlap the microlens array 151. To do.

  Therefore, among the primary color light that passes through the microlens array 151 and enters the condenser lens 172, blue wavelength band light and green wavelength band light that does not pass through the excitation light reflecting mirror 161 enter the modified glass plate 165 and pass therethrough. By doing so, it can be incident on the condensing lens 172 with the same optical path length as the primary color light transmitted through the excitation light reflecting mirror 161 and incident on the condensing lens 172, and can be condensed on the display element 51.

  For this reason, when the image of each micro convex lens 151a of the micro lens array 151 is formed on the display element 51 via the condenser lens 172, the light transmitted through the excitation light reflecting mirror 161 and the light not transmitted through the excitation light reflecting mirror 161 Therefore, the images can be more accurately matched.

  Further, as a third embodiment of the light source unit 60, as shown in FIG. 7, the excitation light reflecting mirror 161 is omitted.

  In the third embodiment, each primary color light emitted from the red light source device 120, the fluorescent light emitting device 100, and the blue light source device 140 and the excitation light emitted from the excitation light irradiation device 70 are applied to the microlens array 151. The incident range is made different.

  In the light source unit 60, the first dichroic region 156 of the dichroic mirror 155 is a dichroic mirror that reflects green wavelength band light and transmits red wavelength band light and blue wavelength band light, and the second dichroic region 157. As a total reflection mirror or a dichroic mirror that reflects at least the blue wavelength band light used as excitation light.

  Then, the first dichroic region 156 is arranged at the optical axis position of the emitted light from the red light source device 120 and the blue light source device 140, and the second dichroic region 157 is more positive than the positions of the red light source device 120 and the blue light source device 140. The dichroic mirror 155 is arranged so as to be removed in the direction of the face plate 12.

  In the fluorescent light emitting device 100, the optical axis of the condensing lens 110 and the center of the fluorescent plate 101 are shifted to adjust the distance between the condensing lens 110 and the fluorescent plate 101, the combined focal length of the condensing lens 110, and the like. Then, the image of each micro-convex lens 151a is slightly shifted, and the image of the portion of the micro-lens array 151 through which the excitation light is transmitted is projected and irradiated onto the fluorescent plate 101 away from the optical axis position of the condenser lens 110.

  As described above, since the fluorescent plate 101 is shifted, the green wavelength band light emitted from the fluorescent plate 101 is incident on a region of the microlens array 151 different from the incident region of the excitation light. Then, the red wavelength band light from the red light source device 120 and the blue wavelength band light from the blue light source device 140 are placed in a region of the microlens array 151 different from the incident region of the excitation light, and each optical axis is a green wavelength band light. It is incident so as to be parallel to the optical axis.

  In this embodiment, the number of parts of the light source unit 60 can be reduced and the assembly adjustment of the light source unit 60 can be facilitated without using the excitation light reflecting mirror 161.

Further, the light source unit 60 may be the fourth embodiment shown in FIG.
This light source unit 60 is a region in which the primary color light is transmitted through the micro convex lens 151a in the region where the excitation light is transmitted, compared to the micro convex lens 151a in the region where the primary color light is transmitted in the region where the excitation light of the micro lens array 151 is transmitted. The micro convex lens 151a is smaller than the micro convex lens 151a.

  As described above, the micro-lens array 151 is formed with the excitation light region 152 having different characteristics of the micro-lens array 151 by changing the shape of the micro-convex lens 151a between the region where the primary color light is transmitted and the region where the excitation light is transmitted. Is.

  Therefore, in the region of the microlens array 151 that transmits coherent excitation light, the excitation light from the excitation light source 71 is efficiently transmitted to the fluorescent plate 101 by separating the characteristics of the microlens array 151 from those of the region through which primary color light is transmitted. Each of the primary color light that can be uniformly condensed and also includes the red wavelength band light from the red light source device 120, the green wavelength band light from the fluorescent light emitting device 100, and the blue wavelength band light from the blue light source device 140. In addition, the light can be efficiently and uniformly condensed on the display element 51.

  Then, as shown in FIG. 9 as the fifth embodiment, the excitation light region 152 in which the region where the excitation light is transmitted in the microlens array 151 is different from the region where the primary color light is transmitted is different from the region where the characteristics of the microlens array 151 are different. The excitation light reflection mirror 161 is provided on the light guide optical system 170 side of the microlens array 151, and the excitation light reflection mirror 161 has the emission direction of the excitation light emitted from the excitation light source 71 as the direction of the back plate 13. Irradiation.

  As described above, by providing the excitation light reflecting mirror 161, the arrangement of the excitation light irradiation device 70 including the excitation light source 71 in the light source unit 60 is given a degree of freedom, and the combined arrangement of the constituent members of the light source unit 60 is easy. It can be.

  In the first to fifth embodiments as the light source unit 60, the red light source device 120 and the blue light source device 140 are disposed on the right side plate 15 side with respect to the dichroic mirror 155, and the fluorescent light emitting device 100 is disposed on the dichroic mirror 155. Although the fluorescent light emitting device 100 is disposed closer to the front plate 12 side, the transmission and reflection characteristics of the dichroic mirror 155 are reversed, and the fluorescent light emitting device 100 is disposed closer to the right side plate 15 than the dichroic mirror 155, and the red light source The fluorescent light emitting device 100 may be disposed on the front plate 12 side of the device 120 and the blue light source device 140 from the dichroic mirror 155.

  In the above embodiment, the excitation light from the excitation light source 71 is blue wavelength band light, but may be other wavelength band light such as ultraviolet light, and the excitation light reflecting mirror 161 reflects at least the excitation light. If fluorescent light or the like is incident, it is sufficient to transmit visible light or the like.

  Thus, in this embodiment, the excitation light from the excitation light source 71 is irradiated to the fluorescent plate 101 via the microlens array 151, and the fluorescent light from the fluorescent plate 101 is incident from the opposite surface of the same microlens array 151. Since the light is emitted through the microlens array 151, uniform light is emitted to the fluorescent screen 101 by the microlens array 151 with a small number of components, and the display element 51 is easily emitted as uniform light by the microlens array 151. A light source unit 60 capable of emitting light can be easily assembled and optically adjusted, and by using this light source unit 60, a small projector capable of projecting a bright image with little unevenness in luminance is provided. Can do.

  The light source unit 60 that emits the fluorescent light and the other wavelength band light through the microlens array 151 by making the other wavelength band light enter the microlens array 151 in parallel with the fluorescent light using the dichroic mirror 155. The light source device can emit a plurality of light of different colors, and if the fluorescent light is green wavelength band light and the other light is red wavelength band light and blue wavelength band light, the projector 1 or the like A light source device suitable for an image forming apparatus can be obtained.

  Further, if the excitation light is incident on the microlens array 151 using the excitation light reflecting mirror 161, the orientation of the excitation light reflecting mirror 161 can be changed to give flexibility to the arrangement of the excitation light source 71. If the mirror that transmits the fluorescent light is used as the excitation light reflecting mirror 161, it is easy to prevent the excitation light and the fluorescent light from being buffered, and the arrangement of the components of the light source unit 60 can be easily changed. The size reduction of 60 can be further facilitated.

  Furthermore, if the excitation light is blue wavelength band light, the green light-emitting phosphor can be efficiently emitted, the blue wavelength band light is reflected by the excitation light reflecting mirror 161, and the red wavelength band light and the green wavelength band light are reflected. If it is made to transmit, the arrangement | positioning adjustment and size reduction of the structural member of the light source unit 60 can be made easy by preventing the buffering of excitation light and fluorescence light.

  When a part of the fluorescent light is emitted from the light source unit 60 via the excitation light reflection mirror 161, the fluorescent light that does not pass through the excitation light reflection mirror 161 is emitted from the light source unit 60 via the modified glass plate 165. If so, the display element 51 can be irradiated with light source light with higher surface uniformity, and the microlens characteristics of the microlens array 151 can be made different between the excitation light incident area and the fluorescent light incident area of the microlens array 151. For example, the uniform light irradiation to the fluorescent plate 101 and the uniform light irradiation to the display element 51 are further facilitated.

  If the fluorescent plate 101 and the condensing lens 110 are combined as the fluorescent light emitting device 100, it is possible to efficiently irradiate the fluorescent plate 101 with excitation light and irradiate the microlens array 151 with fluorescent light from the fluorescent plate 101. .

  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] having an excitation light source, a phosphor and a microlens array;
Excitation light from the excitation light source is incident from one surface of the microlens array and transmitted through the microlens array to irradiate the phosphor.
A light source unit, wherein the fluorescent light emitted from the phosphor is incident from the other surface of the microlens array, is transmitted through the microlens array, and is emitted.
[2] A dichroic mirror is provided on the excitation light exit side of the microlens array, and the light beam having a wavelength band different from that of the fluorescent light is used as an optical axis parallel to the optical axis of the fluorescent light by the dichroic mirror. The light source unit according to [1], wherein the light source unit is incident on the microlens array from the same side as the fluorescent light and emits the fluorescent light and the wavelength band light having a wavelength band different from that of the fluorescent light.
[3] The fluorescent light emitted from the phosphor is green wavelength band light, and the wavelength band light different from the fluorescent light is red wavelength band light and blue wavelength band light. [2] The light source unit described in the above.
[4] The dichroic mirror includes a lower region that reflects the excitation light from the excitation light source toward the phosphor, and an upper region that transmits the same wavelength band light as the excitation light. The light source unit described in [3]
[5] The microlens array has an excitation light reflecting mirror on the excitation light incident side, and the excitation light from the excitation light source is incident on the microlens array via the excitation light reflecting mirror. The light source unit according to any one of [1] to [4].
[6] The light source unit according to [5], wherein the excitation light reflecting mirror allows a part of the fluorescent light transmitted through the microlens array to be incident and transmitted.
[7] The light source unit according to any one of [1] to [6], wherein the excitation light is light in a blue wavelength band.
[8] The light source unit according to [6], wherein the excitation light reflecting mirror reflects blue wavelength band light and transmits red wavelength band light and green wavelength band light.
[9] A correction glass plate having the same quality and the same thickness as the substrate of the excitation light reflecting mirror, and incident on the excitation light reflecting mirror among the fluorescent light transmitted through the microlens array The light source unit according to [6], wherein the fluorescent light that is not incident is transmitted through the modified glass plate and transmitted together with the fluorescent light that has passed through the excitation light reflecting mirror.
[10] The microlens array is configured such that a region where the excitation light is incident is different from a region where the fluorescence light is incident, and the region where the excitation light is incident and the region where the fluorescence light is incident The light source unit according to any one of [1] to [5], wherein the microlens characteristics are different.
[11] The above-mentioned [1] to [1], wherein the phosphor is provided as a phosphor layer on a mirror-finished flat plate, and includes a fluorescent light emitting device having the flat fluorescent plate and a condenser lens. [10] The light source unit according to any one of [10].
[12] The light source unit according to any one of [1] to [11],
A display element for generating projection light;
A light guide optical system for guiding the emitted light from the light source unit to the display element;
A projection optical system for guiding the projection light generated by the display element;
Projector control means for controlling the display element and the light source unit;
A projector comprising:

DESCRIPTION OF SYMBOLS 1 Projector 5 Upper case 6 Lower case 11 Top plate 12 Front plate 13 Back plate 14 Left side plate 15 Right side plate 18 Intake hole 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 / Expansion Unit 32 Memory Card 37 Key / Indicator Unit 38 Control Unit 41 Light Source Control Circuit 42 Illuminance Sensor 43 Cooling Fan Drive Control Circuit 45 Lens Motor 47 Audio Processing Unit 48 Speaker 51 Display Element 55 Battery 57 Power Connector 60 light source unit 70 excitation light irradiation device 71 excitation light source 73 collimator lens
DESCRIPTION OF SYMBOLS 100 Fluorescence light-emitting device 101 Fluorescent plate 110 Condensing lens 120 Red light source device 121 Red light source 125 Condensing lens 130 Heat pipe 140 Blue light source device 141 Blue light source 145 Condensing lens 150 Light source optical system 151 Micro lens array 151a Micro convex lens 152 For excitation light Area 155 Dichroic mirror 156 First dichroic area 157 Second dichroic area 161 Excitation light reflecting mirror 165 Modified glass plate 170 Light guiding optical system 172 Condensing lens 175 Prism 190 Heat sink 225 Lens barrel 235 Movable lens group 241 Main control circuit board 242 Power supply control circuit board 261 Cooling fan

Claims (14)

An excitation light source that emits excitation light, a phosphor, and a microlens array ;
A dichroic mirror on the excitation light exit side of the microlens array;
Have
Before Ki励 Okoshiko is irradiated to one said phosphor is transmitted through the microlens array is incident from the surface of the microlens array,
The fluorescent light emitted from the phosphor enters from the other surface of the microlens array and passes through the microlens array .
The optical axis of the luminous flux of the wavelength band having a wavelength band different from that of the fluorescent light is parallel to the optical axis of the fluorescent light by the dichroic mirror, and the luminous flux of the wavelength band having a wavelength band different from the fluorescent light is A light source unit that is incident on the microlens array from the same side as the light and passes through the microlens array . Fluorescent light the phosphor emits is green wavelength band, the wavelength band different from that of the fluorescent light according to claim 1, characterized in that the red wavelength band light and blue wavelength band, Light source unit. The dichroic mirror before and lower region for reflecting the Ki励 Okoshiko the phosphor to claim 2, characterized in that they are composed of the upper region which transmits the same wavelength band as the excitation light The light source unit described. The excitation light source unit as set forth in any one of claims 1 to 3, characterized in that the light of the blue wavelength band. The phosphor is laid as a phosphor layer on the mirror-finished flat plate,
A light source unit as set forth in any one of claims 1 to 4, characterized in that it comprises a fluorescent light emitting device having a fluorescent screen comprising the plate and the phosphor layer, and a condenser lens, a. An excitation light source that emits excitation light, a phosphor, and a microlens array;
An excitation light reflecting mirror provided on the incident side of the excitation light of the microlens array;
Have
The excitation light is incident from one surface of the microlens array via the excitation light reflecting mirror, passes through the microlens array, and is irradiated to the phosphor.
Fluorescent light emitted from the phosphor enters from the other surface of the microlens array and passes through the microlens array. The light source unit according to claim 6, wherein the excitation light reflecting mirror allows a part of the fluorescent light transmitted through the microlens array to be incident and transmitted. The light source unit according to claim 6, wherein the excitation light is light in a blue wavelength band. The light source unit according to claim 7, wherein the excitation light reflecting mirror reflects blue wavelength band light and transmits red wavelength band light and green wavelength band light. The fluorescent light that has a modified glass plate that is the same quality and the same thickness as the substrate of the excitation light reflecting mirror, and that is not incident on the excitation light reflecting mirror among the fluorescent light that has passed through the microlens array The light source unit according to claim 7, wherein light is incident on the corrected glass plate to be transmitted, and is emitted together with fluorescent light transmitted through the excitation light reflecting mirror. The phosphor is laid as a phosphor layer on the mirror-finished flat plate,
The light source unit according to any one of claims 6 to 10 , further comprising a fluorescent light emitting device including a fluorescent plate including the flat plate and the phosphor layer, and a condensing lens. An excitation light source that emits excitation light, a phosphor, and a microlens array;
The excitation light is incident from one surface of the microlens array, passes through the microlens array, and is irradiated to the phosphor.
The fluorescent light emitted from the phosphor enters from the other surface of the microlens array and passes through the microlens array.
The microlens array, in the region where the pumping light is incident to the fluorescent light made different from the area to be incident, realm of the excitation light is Ru is incident and said realm fluorescent light Ru is incident, light source unit you characterized in that it different from the microlens properties. The phosphor is laid as a phosphor layer on a mirror-finished flat plate,
The light source unit according to claim 12, comprising a fluorescent light emitting device including a fluorescent plate including the flat plate and the phosphor layer, and a condensing lens. A light source unit according to any one of claims 1 to 13 ,
A display element for generating projection light;
A light guide optical system for guiding the emitted light from the light source unit to the display element;
A projection optical system for guiding the projection light generated by the display element;
Projector control means for controlling the display element and the light source unit;
A projector comprising:

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