JP2008281895A - Light source device, illuminating device, monitoring device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To narrow a beam-to-beam distance formed by a plurality of laser beams by using simple constitution when increasing light quantity by using a light source device which emits the plurality of laser beams. <P>SOLUTION: The beams L1a and L1b are emitted from respective laser array light sources 10a and 10b, are deflected by a deflection prism 50 and emitted to an aperture part 19 as nearly parallel beams L2a and L2b. At such a time, the beam-to-beam distance W2 formed by the beam L2a and the beam L2b is made narrower than the beam-to-beam distance W1 formed by the beam L1a and the beam L1b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light source device, an illumination device, a monitor device, and a projector.

  In a light source device using a laser light source, it is required to increase the brightness of emitted laser light. For this reason, the amount of light may be increased by using a light source device that emits a plurality of laser beams. For example, in the light source device described in Patent Document 1 below, high brightness is realized by deflecting a plurality of laser beams emitted from a plurality of semiconductor lasers using a plurality of deflecting members.

JP 2007-17925 A

  However, when a light source device that emits a plurality of laser beams is used, the distance between the beams formed by the plurality of laser beams may be increased. When the distance between the beams is widened, there is a possibility that the optical system in the optical system using the laser beam emitted from the light source device is enlarged or the utilization efficiency of the laser beam is lowered. Further, in the light source device configured as described in Patent Document 1, a plurality of deflecting members for deflecting a plurality of laser beams are independently arranged, and the adjustment of the deflection direction becomes complicated, and the light source device includes There is a problem that the cost concerned becomes high.

  An object of the present invention is to reduce the distance between beams formed by a plurality of laser beams using a simple configuration when the light amount is increased using a light source device that emits a plurality of laser beams in view of the above-described problems. The purpose is to let you.

  The light source device according to the present invention includes a light source unit that emits a plurality of laser beams, a deflecting unit that has a surface that deflects the emitted laser beams in different directions, and has an integral structure, W1> W2, where W1 is an inter-beam distance formed by a plurality of laser beams incident on the deflecting unit and W2 is an inter-beam distance formed by the deflected laser beams.

  According to the light source device of the present invention, a plurality of laser beams are emitted from the light source unit, and the plurality of laser beams are deflected by the deflection unit having an integral structure. At this time, the inter-beam distance W2 formed by the plurality of deflected laser beams is made narrower than the inter-beam distance W1 formed by the plurality of laser beams incident on the deflecting unit. Since the deflected inter-beam distance W2 is narrowed, it is possible to prevent the inter-beam distance formed by the plurality of laser beams from being increased when the amount of light is increased by emitting the plurality of laser beams from the light source unit. In addition, since the deflection unit has an integrated structure that can be shared for a plurality of laser beams, the light source device can be configured simply and the cost associated with the light source device can be suppressed.

  In the light source device according to the present invention described above, the plurality of laser beams include a first beam and a second beam, the deflection unit includes a prism unit, and the prism unit converts the first beam into the first beam. A first surface that is transmitted into the prism portion, a second surface that internally reflects the first beam transmitted through the first surface at the prism portion, and an internal reflection at the second surface. And a third surface that refracts the first beam from the inside of the prism portion to the outside and reflects the second beam to the outside.

  According to this light source device, in the prism unit constituting the deflecting unit, the first beam is transmitted from the first surface to the inside of the prism unit, internally reflected on the second surface, and refracted on the third surface. And emitted to the outside of the prism portion. In addition, the second beam is emitted after being externally reflected on the third surface. At this time, regarding the inter-beam distance between the first beam and the second beam, the inter-beam distance when emitted from the prism unit is larger than the inter-beam distance when these beams enter the prism unit. Make it narrower. Such an optical function for narrowing the distance between the beams can be realized in the prism portion.

  In the above-described light source device according to the present invention, the plurality of laser beams include a first beam and a second beam, the deflection unit includes a reflection unit, and the reflection unit reflects the first beam. A first surface to be reflected and a second surface to reflect the second beam, wherein the first surface and the second surface are provided with a step. .

  According to this light source device, the first beam is reflected by the first surface and the second beam is reflected by the second surface in the reflecting unit constituting the deflecting unit. At this time, the inter-beam distance between the first beam and the second beam is greater than the inter-beam distance when these beams are incident on the first surface and the second surface. The distance between the beams when reflected on the surface is reduced. Since the first surface and the second surface are arranged with a step, such an optical function for narrowing the inter-beam distance can be realized in the reflecting portion.

  In the light source device according to the present invention described above, the deflected first beam and the deflected second beam are substantially parallel to each other.

  According to this light source device, since the first beam and the second beam are deflected substantially in parallel, the design and arrangement of an optical system using the laser beam emitted from the light source device is facilitated.

  In the light source device according to the present invention described above, the plurality of laser beams incident on the deflection unit include visible light and infrared light, and at least one of the surfaces of the deflection unit that deflects the plurality of laser beams is The visible light is deflected to transmit the infrared light.

  According to this light source device, visible light and infrared light are separated by deflecting visible light and transmitting infrared light in the deflecting unit. Thereby, it is possible to prevent the infrared light at a level causing a safety problem to the human body from leaking from the light source device to the outside.

  The above-described light source device according to the present invention is characterized in that the light source device includes an absorption unit that absorbs the infrared light transmitted by the deflection unit.

  According to this light source device, the transmitted infrared light can be absorbed in the light source device by the absorber. Thereby, it is possible to prevent the infrared light at a level causing a safety problem to the human body from leaking from the light source device to the outside.

  The illumination device according to the present invention includes the above-described light source device.

  According to the illuminating device of the present invention, a plurality of laser beams having a narrow inter-beam distance are emitted from the above-described light source device, so that the illuminating device can be miniaturized and the use efficiency of the laser beam can be improved. Can be high. Furthermore, high-intensity illumination light can be irradiated by using a plurality of laser beams.

  A monitor device according to the present invention includes the above-described light source device and an imaging unit that images a subject irradiated by the light source device.

  According to the monitor device of the present invention, since a plurality of laser beams having a narrow inter-beam distance are emitted from the light source device described above, the monitor device can be reduced in size, and the utilization efficiency of the laser beam can be improved. Can be high. Furthermore, high-intensity illumination light can be irradiated by using a plurality of laser beams.

  A projector according to the present invention includes the above-described light source device and an image forming apparatus that displays an image of a desired size on a display surface using light from the light source device.

  According to the projector of the present invention, since a plurality of laser beams having a narrow inter-beam distance are emitted from the light source device described above, the projector can be miniaturized and the use efficiency of the laser beam can be increased. be able to. Furthermore, a high-luminance image can be projected by using a plurality of laser beams.

(First embodiment)
The light source device according to the first embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of a light source device according to the first embodiment of the present invention. As shown in the figure, a light source device 1 includes a laser array light source 10a, 10b as a light source unit, and a deflection prism as a prism unit that constitutes a deflection unit on the laser beam emission side from the laser array light sources 10a, 10b. 50. Each of the laser array light sources 10a and 10b has the same configuration, and is arranged adjacent to each other vertically in FIG. Each laser array light source 10a, 10b has a laser array 11, a polarization beam splitter 12, a wavelength conversion element 13, and a reflecting mirror 14. In each of the laser array light sources 10 a and 10 b, the substrate 15 on which the laser array 11 is mounted and the Peltier element 16 are attached to the base 17. Moreover, the housing | casing 18 has accommodated each above-mentioned component.

  The laser array 11 is a vertical cavity surface emitting laser array, and emits laser light having an emission wavelength of 1060 nm toward the polarization beam splitter 12. The polarization beam splitter 12 selectively transmits the P-polarized component of the incident laser light. The laser beam that has passed through the polarization beam splitter 12 enters the wavelength conversion element 13. As the laser array 11, for example, a semiconductor laser, a solid-state laser, or the like can be used.

The wavelength conversion element 13 converts the incident laser light into light having a wavelength half that of the fundamental wave (second harmonic). Then, a laser beam including the second harmonic wave after wavelength conversion and the fundamental wave that has passed through the wavelength conversion element 13 without being wavelength-converted is emitted from the wavelength conversion element 13. That is, the laser light emitted from the wavelength conversion element 13 includes a second harmonic having a wavelength of about 530 nm and a fundamental wave having a wavelength of about 1060 nm. Laser light emitted from the wavelength conversion element 13 enters the reflecting mirror 14. The wavelength conversion element 13 is attached to the Peltier element 16, and temperature control of the wavelength conversion element 13 is performed using the Peltier element 16. For example, PPLN (Periodically Poled LiNbO ₃ ) can be used as the wavelength conversion element 13. The PPLN acts as a second harmonic generation (SHG) element that generates a second harmonic having a frequency twice that of the fundamental wave.

The reflecting mirror 14 is a reflecting mirror that selectively reflects light having a wavelength of about 1060 nm. The second harmonic contained in the laser light passes through the reflecting mirror 14 and is emitted as laser light containing almost no fundamental wave. On the other hand, most of the fundamental wave contained in the laser light is reflected by the reflecting mirror 14, passes through the wavelength conversion element 13 and the polarization beam splitter 12, and is returned to the laser array 11. In the laser array 11, the active layer that is the gain medium of the laser array 11 is excited by the returned fundamental wave, and is used as energy for generating laser light. Laser light emitted from the reflecting mirror 14 enters the deflecting prism 50. The reflecting mirror 14 can be formed of, for example, an optical multilayer film in which a plurality of dielectric thin films (such as a TiO ₂ layer and a SiO ₂ layer) that selectively reflect light of a specific wavelength are stacked.

  Here, as shown in FIG. 1, the laser light emitted from the reflecting mirror 14 in the laser array light source 10a is referred to as a beam L1a, and the laser light emitted from the reflecting mirror 14 in the laser array light source 10b is referred to as a beam L1b. The beams L1a and L1b are emitted substantially in parallel with each other.

  The deflecting prism 50 is formed as an integral structure that can be shared by both the laser array light sources 10a and 10b, and reflects incident laser light to deflect it in a direction different from the incident direction. As shown in FIG. 1, in the deflecting prism 50, a surface 51 serving as a first surface facing the incident side of the beam L1a is disposed perpendicular to the optical axis of the beam L1a. The surface 52 as the second surface located on the opposite side of the surface 51 is disposed so as to be inclined with respect to the optical axis of the beam L1a. A surface 53 as a third surface facing the incident side of the beam L1b is disposed to be inclined with respect to the optical axis of the beam L1b. Here, a reflective film is formed on the surfaces 52 and 53. The reflective film transmits laser light incident at an angle less than the critical angle and totally reflects laser light incident at an angle greater than the critical angle. As the reflective film, for example, a metal film made of a metal such as chromium (Cr), a dielectric multilayer film, or the like can be used. The deflection prism 50 can be formed using a member such as glass, for example.

The beam L1a emitted from the reflecting mirror 14 of the laser array light source 10a is incident perpendicularly to the surface 51 from the air, is transmitted from the surface 51 into the deflection prism 50, and is incident on the surface 52. Since the beam L1a is incident on the surface 52 at an angle greater than the critical angle of the reflective film, the beam L1a is internally reflected on the surface 52 and enters the surface 53 from the inside. The beam L1a is refracted at the interface of the surface 53 and is emitted as the beam L2a to the opening 19 of the housing 18.
Further, the beam L1b emitted from the reflecting mirror 14 of the laser array light source 10b is obliquely incident on the surface 53 from the air. Since the beam L1b is incident on the surface 53 at an angle equal to or greater than the critical angle of the reflecting film, the beam L1b is externally reflected on the surface 53 and emitted as the beam L2b to the opening 19 of the housing 18. Each of the beams L2a and L2b is emitted to the opening 19 substantially in parallel with each other.

  As shown in FIG. 1, the distance between the optical axes of the beams L1a and L1b, that is, the distance between the beams formed by the beams L1a and L1b is W1, and the distance between the optical axes of the beams L2a and L2b, That is, the distance between the beams formed by the beams L2a and L2b is W2. In the present embodiment, the shape of the deflecting prism 50, the medium, the inclination angle of each surface, the reflection film, and the like emit the beam L2a and the beam L2b to the opening 19 substantially in parallel, and the inter-beam distance W1> beam. It is comprised so that the relationship of the distance W2 may be satisfy | filled.

  As described above, in the light source device 1 according to the present embodiment, the beams L1a and L1b are emitted from the laser array light sources 10a and 10b. These beams L1a and L1b are deflected by the deflecting prism 50, and emitted as beams L2a and L2b to the opening 19 substantially in parallel. At this time, the beam L 1 a incident on the deflecting prism 50 is internally reflected by the surface 52 and refracted by the surface 53. On the other hand, the beam L1b is externally reflected by the surface 53. Thereby, the inter-beam distance W2 formed by the beams L2a and L2b is narrower than the inter-beam distance W1 formed by the beams L1a and L1b. That is, the distance between the beams formed by the laser beams emitted from the laser array light sources 10a and 10b can be reduced and emitted from the light source device 1.

  In addition, the deflection prism 50 is configured to divide the region where each of the beams L1a and L1b is incident into a surface 51, a surface 52, and a surface 53 of the deflection prism 50. For this reason, the deflecting prism 50 can have an integrated structure that can be shared by the beams L1a and L1b. Thereby, the light source device 1 can be made into a simple structure, and the cost concerning the light source device 1 can be suppressed.

(Second Embodiment)
The light source device according to the second embodiment of the present invention will be described below with reference to the drawings.

  FIG. 2 is a diagram showing a schematic configuration of a light source device according to the second embodiment of the present invention. As shown in the figure, the light source device 2 is different from the light source device 1 of the first embodiment in that the wavelength is selected as a reflection unit constituting the deflection unit on the laser beam emission side from the laser array light sources 10a and 10b. A mirror 60 and an IR absorber 70 as an absorber are provided.

  In the first embodiment, it has been described that the laser light containing almost no fundamental wave is emitted from the reflecting mirrors 14 of the laser array light sources 10a and 10b. However, since the reflecting mirror 14 transmits some fundamental waves, the laser light emitted from the reflecting mirror 14 includes a fundamental wave composed of infrared light in addition to the second harmonic composed of visible light. It will be defeated.

  The wavelength selection mirror 60 is formed as an integral structure that can be shared by both the laser array light sources 10a and 10b, and reflects visible light included in the incident laser light to deflect it in a direction different from the incident direction. On the other hand, infrared light contained in the incident laser light is transmitted. That is, the laser light incident on the wavelength selection mirror 60 is separated into visible light and infrared light. As shown in FIG. 2, the wavelength selection mirror 60 has two surfaces 61 and 62, and each surface is arranged with a step. Each of the surfaces 61 and 62 is disposed so as to be inclined with respect to the optical axes of the beams L1a and L1b. As the surfaces 61 and 62 of the wavelength selection mirror 60, for example, a member such as glass in which a wavelength selection film such as a dielectric multilayer film is formed on the incident side surface can be used.

  The IR absorber 70 absorbs infrared light that has passed through the wavelength selection mirror 60 and entered. As the IR absorber 70, for example, a member that absorbs infrared light, such as a metal member made of black anodized aluminum plate, a molded magnesium die-cast structure, or a titanium frame can be used.

The beam L1a emitted from the reflecting mirror 14 of the laser array light source 10a is incident on the surface 61 of the wavelength selection mirror 60 obliquely from the air. The visible light included in the incident beam L1a is totally reflected on the surface 61 and is emitted as the beam L2a to the opening 19 of the housing 18. On the other hand, the infrared light contained in the beam L1a passes through the surface 61, enters the IR absorber 70, and is absorbed.
The beam L1b emitted from the reflecting mirror 14 of the laser array light source 10b is incident on the surface 62 of the wavelength selection mirror 60 obliquely from the air. The visible light contained in the incident beam L1b is totally reflected at the surface 62 and is emitted as the beam L2b to the opening 19 of the housing 18. On the other hand, the infrared light contained in the beam L1b passes through the surface 62, enters the IR absorber 70, and is absorbed. Each of the beams L2a and L2b is emitted to the opening 19 substantially in parallel with each other.

  As shown in FIG. 2, the inter-beam distance formed by the beams L1a and L1b is W1, and the inter-beam distance formed by the beams L2a and L2b is W2. In the present embodiment, the inclination of the surfaces 61 and 62 of the wavelength selection mirror 60 and the respective steps are such that the beam L2a and the beam L2b are emitted to the opening 19 substantially in parallel, and the inter-beam distance W1> the inter-beam distance W2. It is configured to satisfy the relationship.

  As described above, in the light source device 2 according to the present embodiment, the beams L1a and L1b are emitted from the laser array light sources 10a and 10b. Each of these beams L1a and L1b is deflected by the surfaces 61 and 62 of the wavelength selection mirror 60, and the beams L2a and L2b are emitted to the opening 19 substantially in parallel. At this time, since the surfaces 61 and 62 are arranged with a step, the inter-beam distance W2 formed by the beams L2a and L2b is narrower than the inter-beam distance W1 formed by the beams L1a and L1b. That is, the distance between the beams formed by the laser beams emitted from the laser array light sources 10a and 10b can be reduced and emitted from the light source device 2.

  Further, on the surfaces 61 and 62 of the wavelength selection mirror 60, the visible light and the infrared light included in the beams L1a and L1b are separated, and only the visible light is emitted to the opening 19. On the other hand, infrared light is absorbed by the IR absorber 70. Thereby, it is possible to prevent leakage of infrared light at a level causing a safety problem to the human body from the light source device 2 to the outside.

  In the second embodiment, visible light and infrared light are separated by the wavelength selection mirror 60 and the infrared light is absorbed by the IR absorber 70. However, the present invention is not limited to this, and the light source device 1 of the first embodiment may be configured to absorb visible light and infrared light by separating visible light and infrared light. Specifically, the wavelength selection film as described above is formed on the deflection prism 50 of the light source device 1 in the region where the beam L1a is reflected on the surface 52 and the region where the beam L1b is reflected on the surface 53. . The infrared light transmitted through the deflecting prism 50 is absorbed by providing a member that absorbs infrared light such as an IR absorber. Thereby, it is possible to prevent leakage of infrared light at a level causing a safety problem to the human body from the light source device 1 to the outside.

  In the first embodiment and the second embodiment described above, two beams L1a and L1b are emitted using the two laser array light sources 10a and 10b. However, the number of laser array light sources used in the light source device and the number of emitted laser beams are not limited thereto. For example, two laser beams may be emitted using one laser array light source, or three laser beams may be emitted using three laser array light sources. Here, when three or more laser beams are emitted, each of the laser beams is assigned to be incident on each incident surface of the deflecting prism 50 or the wavelength selection mirror 60. Thereby, the distance between the beams formed by three or more laser beams can be narrowed and emitted from the light source device.

(Third embodiment)
<Lighting device>
Initially, the schematic structure of the illuminating device which concerns on 3rd Embodiment to which this invention is applied is demonstrated.
FIG. 3 is a schematic configuration diagram of an illumination apparatus according to the third embodiment of the present invention. As shown in the figure, the illumination device 300 according to the present embodiment includes a light source device 100 and a diffusion element 310 that diffuses laser light emitted from the light source device 100. The light source device 100 includes laser array light sources 10 a and 10 b and a deflection unit 110. Here, as the laser array light sources 10a and 10b, the laser array light sources 10a and 10b in the first and second embodiments described above can be applied. Further, the deflection unit 110 can apply the deflection prism 50 in the first embodiment or the wavelength selection mirror 60 in the second embodiment.

  According to the illumination device 300 configured as described above, a plurality of laser beams having a small inter-beam distance are emitted from the light source device 100. Thereby, the size of the diffusing element 310 can be reduced, and the lighting device 300 can be reduced in size. Moreover, the emitted illumination light has a high image-forming property, the light use efficiency is high, and a clear illuminance can be obtained. Furthermore, high-intensity illumination light can be irradiated by using a plurality of laser beams.

(Fourth embodiment)
<Monitor device>
Next, a schematic configuration of a monitor device according to a fourth embodiment to which the present invention is applied will be described. FIG. 4 is a schematic configuration diagram of a monitor device according to the fourth embodiment of the present invention. As shown in the figure, the monitor device 400 includes a device main body 410 and an optical transmission unit 420. The apparatus main body 410 includes the light source device 100 according to the third embodiment, a condenser lens 412, and a camera 430 as an imaging unit.

  The light transmission unit 420 includes two light guides 422 and 424 on the light transmitting side and the light receiving side. Each light guide 422, 424 is a bundle of a large number of optical fibers, and can send laser light to a distant place. The light source device 100 is disposed on the incident side of the light guide 422 on the light transmission side, and the diffusion plate 426 is disposed on the emission side thereof. The laser light emitted from the light source device 100 is transmitted to the diffusion plate 426 provided at the tip of the light transmission unit 420 through the light guide 422 and is diffused by the diffusion plate 426 to irradiate the subject.

  An imaging lens 428 is provided at the tip of the light transmission unit 420, and reflected light from the subject can be received by the imaging lens 428. The received reflected light travels through the light guide 424 on the receiving side and is sent to the camera 430 provided in the apparatus main body 410. As a result, an image based on the reflected light obtained by irradiating the subject with the laser light emitted from the light source device can be captured by the camera 430.

  According to the monitor device 400 configured as described above, a plurality of laser beams having a small inter-beam distance are emitted from the light source device 100. Thereby, the size of the condenser lens 412 can be reduced, and the monitor device can be reduced in size. Moreover, the emitted illumination light has a high image-forming property, the light use efficiency is high, and a clear illuminance can be obtained. Further, by using a plurality of laser beams, it is possible to irradiate a subject with illumination light with high brightness.

(Fifth embodiment)
<Projector>
Next, a schematic configuration of a projector according to a fifth embodiment to which the invention is applied will be described.
FIG. 5 is a schematic configuration diagram of a projector according to the fifth embodiment of the invention. In FIG. 5, the casing constituting the projector 500 is omitted for simplification. The projector 500 is a front projection type projector that views light by supplying light to the screen 510 and observing light reflected by the screen 510.

  As shown in FIG. 5, the projector 500 includes a red illumination device 512R that emits red light, a green illumination device 512G that emits green light, and a blue illumination device 512B that emits blue light. Each of the red illumination device 512R, the green illumination device 512G, and the blue illumination device 512B includes a light source device for each color, and the configuration of the illumination device 300 of the above-described third embodiment can be applied to these light source devices.

  The projector 500 includes liquid crystal light valves 514R, 514G, and 514B that modulate the illumination light emitted from the illumination devices 512R, 512G, and 512B of the respective colors according to image signals sent from a personal computer or the like. Further, the projector 500 includes a cross dichroic prism 518 that combines the light emitted from the liquid crystal light valves 514R, 514G, and 514B and guides the light to the projection lens 516. Projector 500 also includes a projection lens 516 that magnifies and projects an image formed by liquid crystal light valves 514 R, 514 G, and 514 B onto screen 510.

  The three color lights modulated by the respective liquid crystal light valves 514R, 514G, and 514B enter the cross dichroic prism 518. This prism is formed by bonding four right-angle prisms, and a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are arranged in a cross shape on the inner surface thereof. These dielectric multilayer films combine the three color lights to form light representing a color image. The combined light hits the image forming apparatus and is projected onto a screen 510 as a display surface by a projection lens 516 as a projection optical system, and an image enlarged to a desired size is displayed.

  According to projector 500 configured as described above, a plurality of laser beams having a small inter-beam distance are emitted from the light source devices for the respective colors included in each of illumination devices 512R, 512G, and 512B. Thereby, each size of the illuminating devices 512R, 512G, and 512B can be reduced, and the projector 500 can be reduced in size. Moreover, the emitted illumination light has a high image-forming property, the light use efficiency is high, and a clear illuminance can be obtained. Further, by using a plurality of laser beams, a high-luminance image can be projected on the screen 510 from the projector 500.

The projector 500 according to the present embodiment is a so-called three-plate type liquid crystal projector. Instead of this, color display is possible with only one light valve by turning on the laser array light source in time division for each color light. A single-plate liquid crystal projector having the above-described configuration may be used.
The projector may be a projector having a scanning unit corresponding to an image forming apparatus that displays an image of a desired size on a display surface by scanning a laser beam from a light source device on a screen. The projector may be a so-called rear projector that supplies light to one surface of the screen and observes an image by observing light emitted from the other surface of the screen. Further, the spatial light modulator is not limited to a transmissive liquid crystal display device, and a reflective liquid crystal display device LCOS (Liquid Crystal On Silicon), DMD (Digital Micromirror Device), GLV (Grating Light Valve) or the like may be used. good.

  As mentioned above, although various embodiment of this invention was described, it cannot be overemphasized that this invention is not limited to such embodiment, and can take a various structure in the range which does not deviate from the meaning.

The figure which shows schematic structure of the light source device which concerns on 1st Embodiment of this invention. The figure which shows schematic structure of the light source device which concerns on 2nd Embodiment of this invention. The schematic block diagram of the illuminating device which concerns on 3rd Embodiment of this invention. The schematic block diagram of the monitor apparatus which concerns on 4th Embodiment of this invention. The schematic block diagram of the projector which concerns on 5th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Light source device, 10a, 10b ... Laser array light source, 11 ... Laser array, 12 ... Polarizing beam splitter, 13 ... Wavelength conversion element, 14 ... Reflector, 15 ... Substrate, 16 ... Peltier element, 17 ... Base, 18 ... Enclosure, 19 ... opening, 50 ... deflection prism, 51, 52, 53, 61, 62 ... surface, 70 ... IR absorber, 100 ... light source device, 110 ... deflection unit, 300 ... illumination device, 310 ... diffusion element, 400: monitor device, 410: device main body, 412: condensing lens, 420: light transmission section, 422: light guide, 422, 424 ... light guide, 424 ... light guide, 426 ... diffusion plate, 428: imaging lens, 430 ... Camera, 500 ... Projector, 510 ... Screen, 512B ... Blue illumination device, 512G ... Green illumination device, 512R ... Red illumination device, 5 4R ... liquid crystal light valve, 516 ... projection lens 518 ... cross dichroic prism, L1a, L1b, L2a, L2b ... beam.

Claims (9)

A light source unit for emitting a plurality of laser beams;
Having a surface for deflecting the plurality of emitted laser beams in different directions, and having a deflecting unit having an integral structure;
W1> W2 where W1 is the distance between the beams formed by the plurality of laser beams incident on the deflecting unit and W2 is the distance between the beams formed by the plurality of deflected laser beams. Light source device. The plurality of laser beams includes a first beam and a second beam,
The deflection unit is a prism unit,
The prism portion has a first surface that transmits the first beam into the prism portion;
A second surface for internally reflecting the first beam transmitted through the first surface at the prism portion;
And a third surface for refracting the first beam internally reflected on the second surface from the inside of the prism portion to the outside and reflecting the second beam to the outside. Item 2. The light source device according to Item 1. The plurality of laser beams includes a first beam and a second beam,
The deflecting unit comprises a reflecting unit,
The reflection unit includes a first surface that reflects the first beam;
A second surface for reflecting the second beam;
The light source device according to claim 1, wherein the first surface and the second surface are disposed with a step.   4. The light source device according to claim 2, wherein the deflected first beam and the deflected second beam are substantially parallel to each other. The plurality of laser beams incident on the deflection unit include visible light and infrared light,
5. The at least one surface of the deflecting unit that deflects the plurality of laser beams deflects the visible light and transmits the infrared light. 6. Light source device.   6. The light source device according to claim 1, further comprising an absorption unit configured to absorb the infrared light transmitted by the deflecting unit.   An illumination device comprising the light source device according to any one of claims 1 to 6. The light source device according to any one of claims 1 to 6,
A monitor device, comprising: an imaging unit that images a subject irradiated by the light source device. The light source device according to any one of claims 1 to 6,
An image forming apparatus that displays an image of a desired size on a display surface using light from the light source device.

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