JP2016057375A - Light source device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device capable of emitting a beam of source light transmitted through a diffuser panel and has a high in-plane uniformity.SOLUTION: A light source device 60 includes: a pair of prisms 155 and 156 that convert the direction of optical axis of a source light transmitted through a diffuser panel; and a light guide unit 150 having a glass rod 157 which allows the source light transmitted through the diffuser panel to transmit therethrough.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a light source device and a projector 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. This projector focuses light emitted from a light source on a micromirror display element called DMD (digital micromirror device) or a liquid crystal plate to display a color image on a screen.

  With the spread of video equipment such as personal computers and DVD players, the use of projectors has expanded from business presentations to home use. Conventionally, in such projectors, those using a high-intensity discharge lamp as the light source have been mainstream, but in recent years, a plurality of semiconductor light emitting devices such as laser diodes have been used as the light source. There have been many developments and proposals of light source devices composed of optical components.

  Then, the present applicant uses a fluorescent plate wheel including a green phosphor layer and a blue laser diode, and provides a diffuser transmission part in the fluorescent plate hole, thereby allowing laser light from the blue laser diode to pass through the diffuser transmission part. By making the diffused blue light, the green phosphor layer is irradiated with the laser light from the blue laser diode to generate green fluorescent light, and the red light is emitted from the light emitting diode by further adding the red light emitting diode, so that the light of the three primary colors is emitted. A light source device that can emit light in a time-sharing manner and a projector (for example, Patent Document 1) including the light source device are proposed.

JP 2013-196946 A

  The blue wavelength band light is condensed after the laser light is once diffused by the diffusion plate, and the optical path of the green wavelength band light that is fluorescent light or the red wavelength band light from the red light emitting diode and the optical path of the blue wavelength band light are collected. The display elements are irradiated so as to match, but there is a difference in in-plane uniformity in each luminous flux between the blue wavelength band light, the green wavelength band light and the red wavelength band light, and the color reproducibility of the projected image is not uniform. There was.

  In particular, the blue wavelength band light transmitted through the diffuser plate is diffused using the diffuser plate and then condensed using a lens. However, due to the coherent nature of the laser light, the display element is compared with the other two colors. In some cases, the in-plane uniformity on the front surface of the film was insufficient.

  An object of the present invention is to improve the above-described problems and improve the in-plane uniformity of light source light transmitted through a diffusion plate.

  The light source device of the present invention includes a light guide unit including a prism that converts an optical axis direction of light source light that has passed through a diffusion plate, and a glass rod that transmits light source light that has passed through the diffusion plate. .

  The projector of the present invention projects the light source device, the display element, a light source side optical system that guides light from the light source device to the display element, and image light emitted from the display element on a screen. A projection-side optical system and projector control means for controlling the light source device and the display element are provided.

  According to the present invention, the in-plane uniformity of the light source light transmitted through the diffusion plate can be improved.

1 is an external perspective view showing a projector according to an embodiment of the invention. It is a figure which shows the functional block of the projector which concerns on embodiment of this invention. 1 is a schematic plan view showing an internal structure of a projector according to an embodiment of the invention. It is a plane schematic diagram of the optical wheel used for the light source device which concerns on embodiment of this invention. It is a schematic diagram which shows the principal part of the light source device which concerns on embodiment of this invention. It is a schematic diagram which shows the principal part of the light source device which concerns on other embodiment of this invention.

  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 10. In the present embodiment, left and right in the projector 10 indicate the left and right direction with respect to the projection direction, and front and rear indicate the screen side direction of the projector 10 and the front and rear direction with respect to the traveling direction of the light beam.

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

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

  In addition, an input / output connector portion provided with a D-SUB terminal, an S terminal, an RCA terminal, an audio output terminal, and the like for inputting a video signal to which a USB terminal or an analog RGB video signal is input to the rear panel is provided on the rear surface of the housing; Various terminals 20 such as a power adapter plug are provided. In addition, a plurality of intake holes are formed in the back panel.

  A plurality of exhaust holes 17 are formed in each of the right side panel, which is a side plate of the casing (not shown), and the left side panel 15, which is the side plate shown in FIG. An intake hole 18 is also formed in a corner near the back panel of the left panel 15.

  Next, projector control means of the projector 10 will be described with reference to the functional block diagram of FIG. The projector control means includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like.

  The control unit 38 controls the operation of each circuit in the projector 10, and includes a CPU, a ROM that stores operation programs such as various settings fixedly, and a RAM that is used as a work memory. Yes.

  Then, the image signals of various standards input from the input / output connector unit 21 by the projector control means are 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 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. The projector 10 irradiates the display element 51 with a light beam emitted from the light source unit 60 via a light source side optical system, which will be described later, thereby forming an optical image with the reflected light of the display element 51, and the projection side. An image is projected and displayed on a screen (not shown) through an optical system. The movable lens group 215 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, an operation signal of a key / indicator unit 37 composed of a main key and an indicator provided on the top panel 11 of the housing is directly sent to the control unit 38, and a key operation signal from the remote controller is received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is output to the control unit 38.

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

  Further, the control unit 38 controls a light source control circuit 41 as a light source control 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 unit 60. Individual control for emitting light in the red, green and blue wavelength bands of the light source unit 60 is performed.

  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. In addition, the control unit 38 causes the cooling fan drive control circuit 43 to keep the cooling fan rotating even after the projector 10 main 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 it off is also performed.

  Next, the internal structure of the projector 10 will be described. FIG. 3 is a schematic plan view showing the internal structure of the projector 10. As shown in FIG. 3, the projector 10 includes a control circuit board 91 in the vicinity of the right panel 14. The control circuit board 91 includes a power circuit block, a light source control block, and the like. In addition, the projector 10 includes a light source unit 60 on the side of the control circuit board 91, that is, at a substantially central portion of the projector 10 housing. Further, the projector 10 includes an optical system unit between the light source unit 60 and the left panel 15.

  The light source unit 60 includes an excitation light irradiation device 70, a fluorescent light emitting device 100, a red light source device 120, a light guide unit 150, and a light guide optical system 140. The excitation light irradiation device 70 is disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the projector 10 housing. The fluorescent light emitting device 100 is disposed in the vicinity of the front panel 12 on the optical axis of the light beam emitted from the excitation light irradiation device 70. The red light source device 120 is disposed between the excitation light irradiation device 70 and the fluorescent light emitting device 100. The light guide unit 150 makes the excitation light transmitted through the optical wheel 101 of the fluorescent light emitting device 100 uniform, and is arranged on the front panel 12 side of the optical wheel 101 so as to be aligned with the fluorescent light emitting device 100.

  The light guide optical system 140 includes an optical axis of excitation light in the blue wavelength band transmitted through the light guide unit 150 and an optical axis of red light in the green wavelength band emitted from the fluorescent light emitting device 100 to the back panel 13 side and red. The light emitted from the light source device 120 is converted so that the optical axes of the light beams are the same, and each color light enters the entrance of the light tunnel 175 that is a predetermined surface.

  The excitation light irradiation device 70 has a light source group 72 composed of a plurality of excitation light sources 71 that are solid-state light emitting elements arranged so that the optical axis is parallel to the back panel 13, and the optical axis of the emitted light from each excitation light source 71 in front. A plurality of reflecting mirror groups 75 that convert 90 degrees in the panel 12 direction, a condensing lens 78 that condenses the light emitted from each excitation light source 71 reflected by the plurality of reflecting mirror groups 75, and the excitation light source 71 and the right panel 14 And the like.

  In the light source group 72, a plurality of excitation light sources 71, which are blue laser emitters, are arranged in a matrix. Further, collimator lenses 73 that convert the light emitted from each excitation light source 71 into parallel light are arranged on the optical axis of each excitation light source 71 so as to enhance the directivity of the emitted light from each excitation light source 71. The plurality of reflecting mirror groups 75 are arranged in a staircase shape, and the cross-sectional area of the light flux emitted from the light source group 72 is reduced in the horizontal direction by narrowing the interval between the light source light beams emitted from the respective excitation light sources 71. And is reflected toward the condenser lens 78.

  A cooling fan 85 is disposed between the heat sink 81 and the back panel 13, and the excitation light source 71 is cooled by the cooling fan 85 and the heat sink 81. Further, a cooling fan 85 is also disposed between the reflection mirror group 75 and the back panel 13, and the reflection mirror group 75 and the condenser lens 78 are cooled by the cooling fan 85.

  The fluorescent light emitting device 100 is arranged so as to be parallel to the front panel 12, that is, to be orthogonal to the optical axis of the emitted light from the excitation light irradiation device 70, and to rotate the optical wheel 101. And a condensing lens group 111 that condenses the light bundle emitted from the excitation light irradiation device 70 onto the optical wheel 101 and condenses the light bundle emitted from the optical wheel 101 toward the rear panel 13. A light guide unit 150 that condenses the blue wavelength band light transmitted from the optical wheel 101 in the direction of the front panel 12 while changing the direction of the light in the direction of the back panel 13.

  As shown in FIG. 4, the optical wheel 101 receives the emitted light from the excitation light irradiation device 70 as excitation light and emits fluorescent light in the green wavelength band, and the excitation light irradiation device 70 emits the fluorescent light. A diffusion transmission region 105 that diffuses and transmits the emitted light is provided in parallel in the circumferential direction.

  The base material in the green fluorescent light emitting region 103 is a metal base material made of copper, aluminum or the like, and the surface on the back panel 13 side of this base material is mirror-processed by silver vapor deposition or the like, and this mirror-processed surface In addition, a green phosphor layer is laid.

  The base material in the diffuse transmission region 105 is a transparent base material having translucency, and is formed into an arc shape, and the surface of this base material is a diffusion plate in which fine irregularities are formed by sandblasting, This diffusion plate is fixed to the metal substrate of the optical wheel 101 to form a diffusion transmission region 105.

  The green fluorescent light emitting region 103 is also formed in an arc shape, and the green fluorescent light emitting region 103 and the diffuse transmission region 105 are combined into an annular shape, and the optical wheel 101 is rotated by the wheel motor 110 so that the excitation light irradiation device 70 By irradiating the green fluorescent light emitting region 103 and the diffuse transmission region 105 with the laser light, the green wavelength band fluorescent light from the green fluorescent light emitting region 103 and the blue wavelength band laser light to be diffused light are emitted from the optical wheel 101. Can be emitted.

  That is, the light emitted from the excitation light irradiating device 70 irradiated on the green phosphor layer of the optical wheel 101 excites the green phosphor in the green phosphor layer, and the light flux emitted from the green phosphor in all directions. The light beam is emitted directly to the back panel 13 side or after being reflected by the surface of the optical wheel 101 and then to the back panel 13 side, and enters the light guide optical system 140 via the condenser lens group 111.

  Moreover, the emitted light from the excitation light irradiation device 70 irradiated to the diffuse transmission region 105 of the optical wheel 101 is diffused by the fine unevenness of the diffusion plate. Then, this diffuse transmitted light is incident on the light guide unit 150. The light guide unit 150 provided on the front panel 12 side of the optical wheel 101 includes a prism rod 151 and an exit lens 159. The prism rod 151 includes a connecting rod 157 that is a rectangular prism-shaped glass rod, and the connecting rod 157. The first prism 155 and the second prism 156 are arranged and joined to both ends of the rod 157.

  Then, the blue wavelength band excitation light transmitted through the optical wheel 101 is made parallel to the front panel 12 by the first prism 155, the optical axis is changed in the direction of the left panel 15, and the back surface by the second prism 156 passes through the inside of the connecting rod 157. The optical axis is changed in the direction of the panel 13 and the light is emitted to the light guide optical system 140 through the emission lens 159 that is a condenser lens. A cooling fan 85 is disposed between the wheel motor 110 and the front panel 12, and the fluorescent light emitting device 100 and the like are cooled by the cooling fan 85.

  The red light source device 120 is a monochromatic light emitting device that includes a red light source 121 disposed so that the optical axis is parallel to the excitation light source 71 and a condenser lens group 125 that condenses the light emitted from the red light source 121. is there. The red light source 121 is a red light emitting diode that emits light in the red wavelength band. The red light source device 120 is arranged such that the light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the optical wheel 101 intersect the optical axis.

  Furthermore, the red light source device 120 includes a heat sink 130 disposed on the right panel 14 side of the red light source 121. A cooling fan 85 is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 85.

  The light guide optical system 140 includes a first dichroic mirror 141, a second dichroic mirror 145, a first condenser lens 143, and a second condenser lens 148, and collects light bundles of red, green, and blue wavelength bands. At the same time, the optical axis direction of the light flux in each color wavelength band is converted to enter the light tunnel 175 of the light source side optical system 170 as the same optical axis.

  Specifically, the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the optical wheel 101 intersect with the red wavelength band light emitted from the red light source device 120. A first dichroic mirror 141 that transmits blue and red wavelength band light, reflects green wavelength band light, and converts the optical axis of the green light by 90 degrees toward the left panel 15 is disposed.

  Also, the optical axis of the red wavelength band light transmitted through the first dichroic mirror 141, the optical axis of the green wavelength band light reflected by the first dichroic mirror 141 so as to coincide with this optical axis, and the light beam emitted from the light guide unit 150. At a position where the optical axis of the blue wavelength band light intersects, the blue wavelength band light is transmitted, the red and green wavelength band lights are reflected, and the optical axes of the red and green light are 90 degrees toward the rear panel 13. A second dichroic mirror 145 that performs degree conversion is disposed.

  A first condenser lens 143 is provided between the first dichroic mirror 141 and the second dichroic mirror 145, and a second condenser is provided between the exit lens 159 of the light guide unit 150 and the second dichroic mirror 145. A lens 148 is disposed.

  In addition, a condensing lens 173 of the light source side optical system 170 that condenses the light source light at the entrance of the light tunnel 175 is disposed in the vicinity of the entrance of the light tunnel 175 of the light source side optical system 170.

  The optical system unit includes an illumination side block disposed on the left side of the excitation light irradiation device 70, an image generation block disposed in the vicinity of the position where the back panel 13 and the left panel 15 intersect, and the light guide optical system 140. And a projection-side block disposed between the left panel 15 and the left-side panel 15, and is configured in a substantially U shape.

  The illumination side block includes a part of the light source side optical system 170 that guides the light source light emitted from the light source unit 60 to the display element 51 provided in the image generation block. As the light source side optical system 170 included in the illumination side block, the light beam emitted from the light source unit 60 is collected and incident on the light tunnel 175 through the light collecting lens 173. The light tunnel 175 in which the light bundle has a uniform intensity distribution, the condensing lens 178 that collects the light emitted from the light tunnel 175, and the optical axis of the light bundle emitted from the light tunnel 175 are in the image generation block direction. There is an optical axis conversion mirror 181 or the like that converts the optical axis to

  As the light source side optical system 170, the image generation block includes a condensing lens 183 that condenses the light source light reflected by the optical axis conversion mirror 181 on the display element 51, and a light beam transmitted through the condensing lens 183 as a display element 51. And an irradiation mirror 185 for irradiating at a predetermined angle. Further, the image generation block includes a DMD serving as the display element 51, and a heat sink 190 for cooling the display element 51 is disposed between the display element 51 and the back panel 13. 51 is cooled. Further, a condensing lens 195 as a projection-side optical system 210 is disposed in the vicinity of the front surface of the display element 51.

  The projection side block has a lens group of the projection side optical system 210 that emits ON light reflected by the display element 51 to the screen. The projection-side optical system 210 includes a fixed lens group 213 built in a fixed lens barrel and a movable lens group 215 built in a movable lens barrel, and is a variable focus lens having a zoom function, and is movable by a lens motor. Zoom adjustment and focus adjustment can be performed by moving the lens group 215.

  By configuring the projector 10 as described above, when the optical wheel 101 is rotated and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at different timings, red, green, and blue wavelength band lights are guided light. Since the light is sequentially incident on the light tunnel 175 via the system 140 and further incident on the display element 51 via the light source side optical system 170, the DMD that is the display element 51 of the projector 10 emits light of each color according to data. By displaying in a divided manner, a color image can be generated on the screen.

  The light guide unit 150 of the projector 10 will be described in detail with reference to FIG. 5 which is an enlarged view of the main part of FIG. As described above, the light guide unit 150 includes the first prism 155, the connecting rod 157, the prism rod 151 including the second prism 156, and the exit lens 159.

  The first prism 155 is configured such that an incident surface of a right-angle prism serving as an incident port 152 is disposed in the immediate vicinity of the optical wheel 101 on the front panel 12 side of the optical wheel 101, and incident light from the incident port 152 is transmitted to the left panel 15. The direction is changed by 90 degrees. The connecting rod 157 is a glass rod disposed in parallel with the front panel 12 and transmits incident light from the incident port 152 of the first prism 155 to the inside thereof. The second prism 156 is a right-angle prism and further changes the direction of the light beam transmitted through the connecting rod 157 by 90 degrees and emits the light from the emission port 153 toward the back panel 13. Then, the emitted light beam enters the second condenser lens 148 of the light guide optical system 140 via the emission lens 159.

  That is, the prism rod 151 guides the laser beam in the blue wavelength band, which is transmitted through the diffusion transmission region 105 of the optical wheel 101 and becomes diffused light, to the connecting rod 157 by the first prism 155, and in the connecting rod 157, The in-plane intensity of the blue wavelength band light is made uniform by reflecting the two diffused light on the wall surface, guided to the second prism 156, and emitted toward the back panel 13 by the second prism 156.

  Thus, the light guide unit 150 improves the in-plane uniformity of the light source light in the blue wavelength band transmitted through the diffuse transmission region 105 by the diffusion plate of the optical wheel 101 by the prism rod 151 and the optical axis of the incident light. The direction can be changed by 180 degrees as outgoing light having an optical axis parallel to the optical axis, and the light can be condensed by the outgoing lens 159 and efficiently incident on the light guide optical system 140.

  In this light source unit 60, the light emitted from the red light source 121 using the red light emitting diode as the red wavelength band light is incident on the light guide optical system 140 via the condenser lens group 125, and the green wavelength band light is obtained. The fluorescent light from the green phosphor layer in the green fluorescent light emitting region 103 is incident on the light guide optical system 140 through the condenser lens group 111.

  Further, in this light source unit 60, the blue wavelength band light having high directivity and coherency and lower in-plane uniformity than other wavelength band lights is an excitation light source that has been transmitted through the diffusion plate serving as the diffuse transmission region 105. The in-plane uniformity of the laser light from 71 is enhanced by the prism rod 151 of the light guide unit 150 and enters the light guide optical system 140 through the output lens 159.

  In addition, as described above, the light guide optical system 140 uses the first dichroic mirror 141 to match the optical axes and emission directions of the red wavelength band light and the green wavelength band light, and the second dichroic mirror 145 further increases the blue wavelength band. The optical axis and the emission direction of the light are matched with the optical axis and the emission direction of the red wavelength band light and the green wavelength band light, and the red wavelength band light and the green wavelength band light are condensed by the first condenser lens 143, The blue wavelength band light is condensed by the second condenser lens 148 and is incident on the light source side optical system 170.

  As described above, the blue wavelength band light has the in-plane uniformity of the light obtained by diffusing the blue laser light with the diffusion plate by the prism rod 151 of the light guide unit 150, and the red wavelength band light and the light by the light guide optical system 140. The light is incident on the light tunnel 175 of the light source side optical system 170 together with the green wavelength band light. The light tunnel 175 can further improve the in-plane uniformity of each wavelength band light, and the light source side optical system 170 including the light tunnel 175 displays red wavelength band light, green wavelength band light, and blue wavelength band light. The element 51 can be irradiated.

  Accordingly, the in-plane uniformity of the laser light that has been converted to diffused light is enhanced by the light guide unit 150, and further, the light tunnel 175 provides high in-plane uniformity of red wavelength band light, green wavelength band light, and blue wavelength band light as display elements. By irradiating 51, it is possible to obtain a projector 10 capable of forming a good projection image with high color reproducibility by using the three primary color lights whose in-plane uniformity is approximate.

  Further, by using laser light, it is easy to obtain high-luminance light source light, and the projector 10 capable of projecting a bright image can be obtained.

  When a plurality of blue laser light emitters are used as the blue wavelength band light, the light guide unit 150 has better in-plane uniformity of the blue wavelength band light combining the optical axes of the plurality of laser lights that are coherent light. can do.

  In the above-described embodiment, as described above, the light guide unit 150 is used to collect blue wavelength band light that is transmitted through the diffuse transmission region 105 of the optical wheel 101 and diffused and emitted in the direction of the front panel 12. The direction is changed by 180 degrees toward the rear panel 13 while shining. Therefore, as compared with the conventional case where a plurality of condensing lenses and a plurality of reflecting mirrors are used and the blue wavelength band light is condensed and the direction is changed by 180 degrees, the number of parts is reduced and the assembly is performed. In addition, it is possible to facilitate the assembly work by aligning the optical axes of the components.

  The light guide unit 150 shown in FIG. 5 includes a prism rod 151 in which a first prism 155 and a second prism 156, which are right-angle prisms, are joined to both ends of a quadrangular prism-shaped connecting rod 157, and an output that is a condenser lens. As shown in FIG. 6, the light guide unit is configured as a light guide unit 150A by one right-angle prism, two glass rods, and a plurality of condenser lenses. It may be.

  The light guide unit 150A includes an L-shaped prism rod 151 in which a first prism 161 and a second rod 162, which are square rod-shaped glass rods, are connected by a reflecting prism 165 which is a right-angle prism so as to be orthogonal to each other. This is composed of a single condenser lens and a reflecting mirror 169.

  That is, one end of the first rod 161 is disposed as an incident port 152 in the immediate vicinity of the optical wheel 101, the second rod 162 is disposed in parallel with the front panel 12, and the end surface of the second rod 162 is defined as an exit port 153. An exit lens 159 whose optical axis is aligned with the optical axis of the second rod 162 and a condensing lens serving as the second exit lens 167 are arranged in the mouth 153, and the prism rod 151 is directed in the direction of the left panel 15 in parallel with the front panel 12. The direction of the 90 ° optical axis is changed by the reflecting mirror 169 toward the rear panel 13.

  Accordingly, the in-plane uniformity of the diffused light transmitted through the diffuse transmission region 105 of the optical wheel 101 by the first rod 161 and the second rod 162 can be improved, as in the light guide unit 150 shown in FIG. .

  Further, since the light guide unit 150A in which the first rod 161 and the second rod 162 are coupled by the reflecting prism 165 uses a plurality of condensing lenses as the exit lens 159 and the second exit lens 167, the exit lens. It is possible to easily approximate the optical characteristics of 159 and the second exit lens 167 with the condensing lens group 111 disposed on the rear panel 13 side of the optical wheel 101.

  When the optical characteristics of the exit lens 159 and the second exit lens 167 are approximated to the condensing lens group 111 disposed on the rear panel 13 side of the optical wheel 101, the prism rod 151A serving as the light source surface of the blue wavelength band light. The light path length from the light exit 153 to the second dichroic mirror 145 through the second condensing lens 148 via the reflecting mirror 169, and the phosphor layer of the green fluorescent light emitting region 103 serving as the light source surface of the green wavelength band light The optical path length from the surface to the second dichroic mirror 145 through the first condenser lens 143 via the first dichroic mirror 141 can be made substantially the same optical path length.

  Therefore, by making the first condenser lens 143 and the second condenser lens 148 have the same characteristics, the in-plane uniformity of the green wavelength band light and the blue wavelength band light emitted from the light source unit 60 is approximated. In addition, it is easy to obtain light that approximates optical characteristics such as light distribution characteristics.

  Although not shown, the second rod 162 may be omitted and the prism rod 151B may be formed by joining the first rod 161 and the reflecting prism 165. In this configuration, the diffused light transmitted through the optical wheel 101 is mixed by internal reflection of the first rod 161, and the light source light transmitted through the optical wheel 101 and emitted in the direction of the front panel 12 is reflected by the reflecting prism 165 to the front. The optical axis is changed in a direction parallel to the panel 12, and the optical axis is changed in the direction of the rear panel 13 by the reflection mirror 169. Then, the light guide unit 150 is configured in which an appropriate condensing lens is disposed between the reflection mirror 169 and the prism rod 151B or on the rear panel 13 side of the reflection mirror 169.

  In the above embodiment, the diffusion plate is disposed on the optical wheel 101, the optical motor 101 is rotated by the wheel motor 110, and the optical light beam 101 is irradiated with the light source light in the blue wavelength band to generate the fluorescent light in the green wavelength band. The laser diffused light of the blue wavelength band is generated, but the green phosphor plate is fixed inside the projector 10 and the green phosphor plate is irradiated with excitation light such as blue light or ultraviolet light to fix the green wavelength. While generating band light, it is good also as blue wavelength band light which permeate | transmits the laser beam from a blue laser light emitter through the fixed type | mold or movable type | mold diffuser plate, and injects into the light guide unit 150. FIG.

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

The invention described in the first claim of the present application will be appended below.
[1] A light source device comprising: a light guide unit having a prism that converts an optical axis direction of light source light that has passed through a diffuser plate; and a glass rod that transmits light source light that has passed through the diffuser plate.
[2] The light source device according to [1], wherein the light guide unit further includes a condensing lens that condenses light transmitted through the glass rod.
[3] The light guide unit has a prism rod in which the prisms are joined to both ends of the glass rod, and the light source light incident on one of the prisms is incident on the other prism via the glass rod. The light source device according to [1] or [2], wherein the direction of the light source light incident on the one prism is changed by 180 degrees and emitted from the other prism.
[4] The light guide unit includes a prism rod in which the glass rod is bonded to at least one surface of the prism, and a reflection mirror, and the direction of the light source light transmitted through the glass rod is adjusted with respect to the optical axis by the prism. By changing the direction by 90 degrees and further changing the direction of the optical axis by 90 degrees with the reflection mirror, the direction of the light source light incident on the glass rod and the direction of light reflected by the reflection mirror are changed to 180 degrees. The light source device according to [1] or [2], wherein the light source device is changed degree.
[5] The light source device according to any one of [1] to [4], wherein the light source light is laser light.
[6] The diffusion plate is provided in a part of an optical wheel in which the phosphor layer is provided in an arc shape, and the phosphor layer and the arc-shaped diffusion plate are formed in an annular shape. The light source device according to any one of [1] to [5].
[7] The light source device according to [6], wherein the phosphor layer is formed of a green light emitting phosphor, and the light source light is a laser beam in a blue wavelength band.
[8] The optical system further includes a light guide optical system that matches the optical axis and emits the fluorescent light from the phosphor layer and the light source light transmitted through the diffusion plate and the light guide unit in the same direction. The light source device according to [6] or [7], wherein the light source device is characterized.
[9] The light source device according to [7] or [8], further including a light emitting element that emits light in a red wavelength band.
[10] The light source device according to any one of [1] to [9];
A display element;
A light source side optical system for guiding light from the light source device to the display element;
A projection-side optical system that projects image light emitted from the display element onto a screen;
Projector control means for controlling the light source device and the display element;
A projector comprising:

DESCRIPTION OF SYMBOLS 10 Projector 11 Top panel 12 Front panel 13 Rear panel 14 Right panel 15 Left panel 17 Exhaust hole 18 Intake hole 19 Lens cover 20 Various terminals 21 Input / output connector part 22 Input / output interface 23 Image conversion part 24 Display encoder 25 Video RAM
26 Display drive unit 31 Image compression / decompression unit 32 Memory card 35 Ir reception unit 36 Ir processing unit 37 Key / indicator unit 38 Control unit 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Audio processing unit 48 Speaker 51 Display Element 60 Light source unit 70 Excitation light irradiation device 71 Excitation light source 72 Light source group 73 Collimator lens 75 Reflective mirror group 78 Condensing lens 81 Heat sink 85 Cooling fan 91 Control circuit board 100 Fluorescent light emitting device 101 Optical wheel 103 Green fluorescent light emitting region 105 Diffuse transmission Area 110 Wheel motor 111 Condensing lens group 120 Red light source device 121 Red light source 125 Condensing lens group 130 Heat sink 140 Light guide optical system 141 First dichroic mirror 143 First condensing lens 145 Second dichroic 148 Second condensing lens 150 Light guiding unit 151, 151A Prism rod 152 Incoming port 153 Outgoing port 155 First prism 156 Second prism 157 Connecting rod 159 Outgoing lens 161 First rod 162 Second rod 165 Reflecting prism 167 Second Output lens 169 Reflection mirror 170 Light source side optical system 173 Condensing lens 175 Light tunnel 178 Condensing lens 181 Optical axis conversion mirror 183 Condensing lens 185 Irradiation mirror 190 Heat sink 195 Condenser lens 210 Projection side optical system 213 Fixed lens group 215 Movable lens group

Claims (10)

  A light source device comprising: a light guide unit having a prism that converts an optical axis direction of light source light transmitted through a diffuser plate; and a glass rod that transmits light source light transmitted through the diffuser plate.   The light source device according to claim 1, wherein the light guide unit further includes a condensing lens that condenses light transmitted through the glass rod.   The light guide unit has a prism rod in which the prisms are bonded to both ends of the glass rod, and the light source light incident on one of the prisms is incident on the other prism via the glass rod, 3. The light source device according to claim 1, wherein the direction of the light source light incident on one prism is changed by 180 degrees and emitted from the other prism.   The light guide unit includes a prism rod in which the glass rod is joined to at least one surface of the prism, and a reflection mirror, and the direction of the light source light transmitted through the glass rod is set to be 90 in the direction of the optical axis. And the direction of the light source incident on the glass rod and the direction of the light reflected by the reflecting mirror are changed by 180 degrees by changing the direction of the optical axis by 90 degrees with the reflecting mirror. The light source device according to claim 1, wherein the light source device is a light source device.   The light source device according to claim 1, wherein the light source light is laser light.   The diffuser plate is provided in a part of an optical wheel in which a phosphor layer is provided in an arc shape, and the phosphor layer and the arc-shaped diffuser plate are in an annular shape. The light source device according to claim 1.   The light source device according to claim 6, wherein the phosphor layer is formed of a green light emitting phosphor, and the light source light is laser light in a blue wavelength band.   The optical system further includes a light guide optical system that matches the optical axis and emits the fluorescent light from the phosphor layer and the light source light transmitted through the diffusion plate and the light guide unit in the same direction. The light source device according to claim 6 or 7.   The light source device according to claim 7, further comprising a light emitting element that emits light in a red wavelength band. A light source device according to any one of claims 1 to 9,
A display element;
A light source side optical system for guiding light from the light source device to the display element;
A projection-side optical system that projects image light emitted from the display element onto a screen;
Projector control means for controlling the light source device and the display element;
A projector comprising:

Images