JP2016096109A - Light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device capable of equalizing an intensity distribution of light to be emitted while preventing deterioration of light use efficiency.SOLUTION: An incidence angle range that is a range of incident angles when light emitted from each light source part enters a transparent material is overlapped with an incidence angle range of light from other light source part in a light source device.SELECTED DRAWING: Figure 14

Description

  The present invention relates to a light source device including a plurality of light source units that emit light.

  2. Description of the Related Art Conventionally, as a light source device including a plurality of light source units that emit light, a light source device including a diffusing element that diffuses light emitted from the light source unit is known in order to make the intensity distribution of the emitted light uniform. (For example, Patent Document 1). According to such a light source device, while the intensity distribution of the emitted light can be made uniform, the light is lost by the diffusing element, so that the light utilization efficiency is lowered.

JP 2008-96777 A

  Therefore, in view of such circumstances, an object of the present invention is to provide a light source device capable of making the intensity distribution of emitted light uniform while suppressing a decrease in light use efficiency.

  The light source device includes a plurality of light source units that emit light, and an optical system that receives the light emitted from the plurality of light source units and emits the light toward the incident surface of the light guide, In the plurality of light source units and the optical system, an incident angle range that is an incident angle range when light emitted from each light source unit is incident on the light guide is an incident angle of light from another light source unit. Configured to overlap the range.

  The light source device includes a plurality of light source units that emit light, and a light guide having an incident surface on which light emitted from the plurality of light source units is incident, and is emitted from each of the light source units. An incident angle range that is an incident angle range when light is incident on the light guide overlaps with an incident angle range of light from other light source units.

  Further, the light source device may be configured such that a range in which the incident angle ranges of the light from each light source unit are overlapped is a range that continues from 0 ° to a predetermined angle.

  In the light source device, in the combined light obtained by combining the light from each light source unit, the incident angle when entering the light guide is divided into a plurality of sections according to size. A configuration in which the light intensity per unit angle of the incident angle is higher as the section is larger.

  In the light source device, the combined light obtained by combining the light from each of the light source units may be configured such that the light intensity increases as the incident angle increases.

  As described above, the light source device according to the present invention has an excellent effect that the intensity distribution of emitted light can be made uniform while suppressing a decrease in light use efficiency.

It is a schematic block diagram of the image projector which has the light source device which concerns on one Embodiment. It is a schematic block diagram of the light source device which concerns on the same embodiment. It is a figure explaining the incident pattern of the light which injects into the optical system which concerns on the embodiment. It is a figure explaining the incident angle of the light in the entrance plane of the light guide which concerns on the embodiment. It is a figure explaining an effect | action when one light injects into a light guide. It is a figure explaining the effect | action, Comprising: It is a figure which shows light intensity distribution with respect to the incident angle which injects into a light guide. It is a figure explaining the effect | action, Comprising: It is a figure which shows light intensity distribution with respect to the output angle radiate | emitted from a light guide. It is a figure explaining an effect | action when two light with which the range of an incident angle does not overlap inject into a light guide. It is a figure explaining the effect | action, Comprising: It is a figure which shows light intensity distribution with respect to the incident angle which injects into a light guide. It is a figure explaining the effect | action, Comprising: It is a figure which shows light intensity distribution with respect to the output angle radiate | emitted from a light guide. It is a figure explaining an effect | action when the two lights with which the range of incident angles partly overlaps inject into the light guide. It is a figure explaining the effect | action, Comprising: It is a figure which shows light intensity distribution with respect to the incident angle which injects into a light guide. It is a figure explaining the effect | action, Comprising: It is a figure which shows light intensity distribution with respect to the output angle radiate | emitted from a light guide. It is a figure which shows light intensity distribution with respect to the incident angle which injects into the light guide which concerns on the said embodiment. It is a figure which shows light intensity distribution with respect to the output angle radiate | emitted from the light guide which concerns on the said embodiment. It is a figure explaining the incident pattern of the light which injects into the optical system which concerns on other embodiment. It is a figure which shows the light intensity distribution with respect to the incident angle which injects into the light guide which concerns on the embodiment.

<First Embodiment>
Hereinafter, a first embodiment of a light source device according to the present invention will be described with reference to FIGS. In each figure (the same applies to FIGS. 16 and 17), the dimensional ratio in the drawing does not necessarily match the actual dimensional ratio.

  As shown in FIG. 1, a light source device 2 according to this embodiment is used in an image projection device (for example, a projector) 1. The image projecting device 1 generates a light image with light from the light source devices 2 (2R, 2G, 2B) that emit light of different colors, respectively (three in the present embodiment) and the light source device 2, And an image projection unit 10 that projects onto the screen 100.

  The light source device 2 includes a first light source device 2R that emits light of a first color (for example, red), a second light source device 2G that emits light of a second color (for example, green), And a third light source device 2B that emits light of three colors (for example, blue). In the present embodiment, the plurality of light source devices 2 emit the first to third color lights toward the image projection unit 10 in a separated state.

  The image projection unit 10 receives the light emitted from each light source device 2 and generates an optical image, and the projection that projects the light image emitted from the image optical system 11 onto the screen 100. An optical system (for example, a projection lens) 12 is provided. Further, the image projection unit 10 includes an image projection main body unit 13 that accommodates the optical systems 11 and 12.

  The image optical system 11 includes a polarization beam splitter 11a that transmits only a predetermined polarization component of the light emitted from the light source device 2, and spatial modulation that converts the light emitted from the polarization beam splitter 11a into an optical image. And an element 11b. In addition, the image optical system 11 includes a dichroic prism 11c that synthesizes the light transmitted through each spatial modulation element 11b, and a reflection mirror 11d that reflects the laser light emitted from the first and third light source devices 2R and 2B. It has.

  In the present embodiment, each spatial modulation element 11b is a transmissive liquid crystal element. Note that the image optical system 11 may include a spatial modulation element 11b that is a reflective liquid crystal element or a digital micromirror device.

  The light source device 2 includes a plurality of light source units 3 that emit light, an optical system 4 that receives light emitted from the plurality of light source units 3, and a plurality of light source units 3 and optical systems 4. And a main body portion 5 for housing the container. Further, the light source device 2 includes a light guide 6 through which light emitted from the optical system 4 enters the incident surface 61. The main body 5 includes a connection portion 51 connected to one end of the light guide 6, and the image projection main body 13 includes a connection 13 a connected to the other end of the light guide 6. I have.

  As shown in FIG. 2, the light guide 6 includes an incident surface 61 on which light is incident and an output surface 62 that emits light. In addition, by fixing one end portion of the light guide 6 to the connection portion 51 of the main body 5, the incident surface 61 of the light guide 6 is in a predetermined position with respect to the plurality of light source units 3 and the optical system 4. Positioned. The light emitted from the plurality of light source units 3 is incident on the incident surface 61 of the light guide 6 via the optical system 4.

  The light source unit 3 includes a semiconductor laser 3a that emits laser light, and a collimator lens 3b that makes light emitted from the semiconductor laser 3a substantially parallel light. In the present embodiment, each light source device 2 includes six light source units 3, which are referred to as first to sixth light source units 31 to 36, respectively. The plurality of light source units 31 to 36 are arranged so that the optical axes L <b> 10 to L <b> 60 of the emitted light are parallel to each other at least when entering the optical system 4.

  FIG. 3 shows the incident positions of the lights L <b> 1 to L <b> 6 with respect to the optical incident surface 41 of the optical system 4. As shown in FIG. 3, the plurality of light source units 31 to 36 are distances W <b> 1 between the positions of the optical axes L <b> 10 to L <b> 60 of the emitted light and the center position P <b> 1 of the optical incident surface 41 on the optical incident surface 41 of the optical system 4. ˜W6 (W1 <W2 <W3 <W4 <W5 <W6) are arranged differently.

In FIG. 3, solid lines L <b> 1 to L <b> 6 indicate light L <b> 1 to L <b> 6 (beam diameter) emitted from the light source units 31 to 36. The outer edges of such lights L1 to L6 (beam diameter) are positions where the light intensity is e ⁻² (= 0.1353) with respect to the maximum value in the beam cross section. In the present embodiment, “light emitted from the light source unit” means that the light intensity of the light emitted from the light source unit 3 is e ⁻² (= 0.1353) or more with respect to the maximum value of the light. The light of the area.

  As shown in FIG. 4, the optical system 4 is a focusing lens that focuses the light L <b> 1 to L <b> 6 emitted from the plurality of light source units 31 to 36 toward the center of the incident surface 61 of the light guide 6. That is, the optical system 4 changes (refracts) the optical axes L10 to L60 of the lights L1 to L6 emitted from the light source units 31 to 36 so as to face the center of the incident surface 61 of the light guide 6. ).

  Here, in the optical incident surface 41 of the optical system 4, the distances W1 to W6 between the incident positions of the optical axes L10 to L60 of the respective lights L1 to L6 and the center position P1 of the optical incident surface 41 are different. Thereby, the incident angles θ10 to θ60 (θ10 <θ20 <θ30 <θ40 <θ50 <θ60) of the optical axes L10 to L60 of the lights L1 to L6 with respect to the incident surface 61 of the light guide 6 are different. Specifically, the light axes L10 to L60 with respect to the incident surface 61 of the light guide 6 are larger for the light beams L1 to L6 having a larger distance W1 to W6 between the incident position of the optical axes L10 to L60 and the center position P1 of the optical incident surface 41. The incident angles θ10 to θ60 are large.

  By the way, since each light L1-L6 has a predetermined area | region (beam diameter), it is the range (henceforth "incident angle range") R1-into the incident angle which injects into the entrance plane 61 of the light guide 6. FIG. R6. For example, FIG. 4 shows details only for the sixth light L6 emitted from the sixth light source unit 36. In FIG. 4, a broken line L61 indicates the innermost part of the sixth light L6, and a broken line L62 indicates the outermost part of the sixth light L6.

  The innermost portion L61 of the sixth light L6 is incident on the incident surface 61 of the light guide 6 at the minimum incident angle θ61, and the outermost portion L62 of the sixth light L6 is at the maximum incident angle θ62. It is incident on the incident surface 61 of the light guide 6. Therefore, the incident angle range R6 when the sixth light L6 is incident on the light guide 6 is changed from the minimum incident angle θ61 to the maximum incident angle θ62 (θ61 ≦ R6 ≦ θ62).

  Although not shown in FIG. 4, the other lights L2 to L5 are the same, and the incident angle ranges R2 to R5 of the lights L2 to L5 are outermost from the minimum incident angles θ21 to θ51 of the innermost portions L21 to L51. The maximum incident angles θ22 to θ52 of the portions L22 to L52 are obtained. Since the first light L1 includes the center position P1 of the optical system 4, the incident angle range R1 of the first light is from 0 ° to the maximum incident angle θ12 of the outermost portion L12 (0 ° ≦ R1 ≦ θ12).

  The configuration of the light source device 2 according to the present embodiment is as described above. Next, before describing the operation of the light source device 2 according to the present embodiment, the operation of the light guide 6 will be described.

  In the present embodiment, the light guide 6 is an optical fiber including a core that is a core, a cladding that is disposed outside the core and has a refractive index lower than that of the core, and a coating that covers the cladding. The light guide 6 is not limited to an optical fiber, and may be, for example, a rod integrator.

  The light guide 6 is configured to propagate light along the axial direction while maintaining the angle at which the light incident on the incident surface 61 travels by totally reflecting light on its side surface. Such an operation will be described with reference to FIGS.

  First, the case where one light L7 is incident on the incident surface 61 of the light guide 6 will be described with reference to FIGS.

  As shown in FIG. 5, the optical axis L70 of the light L7 is incident on the incident surface 61 of the light guide 6 at a predetermined incident angle θ70. The innermost portion L71 of the light L7 is incident on the incident surface 61 at the minimum incident angle θ71, and the outermost portion L72 of the light L7 is incident on the incident surface 61 at the maximum incident angle θ72. Therefore, the incident angle range R7 of the light L7 is from the minimum incident angle θ71 to the maximum incident angle θ72 (θ71 ≦ R7 ≦ θ72).

  The light L7 incident on the incident surface 61 proceeds in the axial direction of the light guide 6 while being uniformly spread in the circumferential direction of the light guide 6 when repeatedly reflected on the side surface of the light guide 6. Therefore, the light L7 incident in a predetermined shape (for example, a shape having a predetermined region such as a circular shape or a rectangular shape) on the incident surface 61 is similar to the cross-sectional shape of the light guide 6 after being emitted from the emission surface 62. It becomes the light of shape. In the present embodiment, since the incident angle range R7 does not include 0 °, it is an annular light, but when the incident angle range includes 0 °, it is a circular light.

  Then, since the incident angle is maintained when the light L7 is reflected by the side surface of the light guide 6, the range of the emission angle of the light L7 emitted from the emission surface 62 (hereinafter referred to as “emission angle range”) is This is the same as the incident angle range R7 (θ71 ≦ R7 ≦ θ72). In FIG. 5, the light L7 is shown to be emitted from the center of the emission surface 62. However, the light L7 is emitted from various positions on the emission surface 62 in the emission angle range R7 which is the same range as the incident angle range R7. ing.

  Here, FIG. 6 shows a light intensity distribution with respect to an incident angle incident on the incident surface 61 (hereinafter, “incident angle light intensity distribution”), and a solid line S7i indicates the light with respect to the incident angle incident on the incident surface 61. The light intensity distribution of L7 is shown. FIG. 7 shows a light intensity distribution with respect to an emission angle emitted from the emission surface 62 (hereinafter also referred to as “emission angle light intensity distribution”), and a solid line S7o indicates the emission angle emitted from the emission surface 62. The light intensity distribution of the light L7 is shown.

  In addition, since the light incident on the incident surface 61 in a predetermined shape becomes an annular shape after being emitted from the emission surface 62, in the emission angle light intensity distribution as shown in FIG. ”And“ incident angle ”only affect the“ position ”and“ direction ”incident on the incident surface 61. That is, if the light intensity at the time of incidence and the incident angle are the same, the emission angle light intensity distribution is the same even if the position and direction of incidence on the incident surface 61 are different.

  Therefore, in the incident angle light intensity distribution of FIG. 6 (the same applies to FIGS. 9, 12, 14, and 17), the light intensity distribution indicates the integrated light intensity for each incident angle. On the other hand, the emission angle light intensity distribution of FIG. 7 (the same applies to FIGS. 10, 13, 15, and 19) is obtained for each emission angle on a predetermined line in order to confirm the uniformity of the entire light. The light intensity is shown. 6 and 7 (FIGS. 9 and 10, FIG. 12 and FIG. 13, FIG. 14 and FIG. 15, FIG. 19 and FIG. 20) are not the same.

  Next, the case where two lights L7 and L8 whose incident angle ranges do not overlap with each other on the incident surface 61 of the light guide 6 will be described with reference to FIGS.

  As shown in FIG. 8, the innermost portions L71 and L81 of the lights L7 and L8 are incident on the incident surface 61 at the minimum incident angles θ71 and θ81, and the outermost portions L72 and L82 of the lights L7 and L8 are the maximum. It is incident on the incident surface 61 at incident angles θ72 and θ82. Accordingly, the incident angle ranges R7 and R8 of the lights L7 and L8 are the minimum incident angles θ71 and θ81 to the maximum incident angles θ72 and θ82 (θ71 ≦ R7 ≦ θ72, θ81 ≦ R8 ≦ θ82). The lights L7 and L8 that are incident on the incident surface 61 in a predetermined shape are emitted from the emission surface 62 in the same emission angle ranges R7 and R8 as the incident angle ranges R7 and R8, and then become annular light.

  At this time, the incident angle ranges R7 and R8 of the two lights L7 and L8 do not overlap. Specifically, the maximum incident angle θ72 of one light L7 is smaller than the minimum incident angle θ81 of the other light L8 (θ71 <θ72 <θ81 <θ82). As a result, as shown in FIG. 9, in the incident angle light intensity distribution, the light intensity distributions S7i and S8i of the two lights L7 and L8 do not overlap and are separated. The light intensities of the two lights L7 and L8 are the same.

  In such a case, as shown in FIG. 10, in the emission angle light intensity distribution, the light intensity distributions S7o and S8o of the two lights L7 and L8 do not overlap and are separated. Thus, when the two lights L7 and L8 that do not overlap the incident angle ranges R7 and R8 are incident, the light intensity distributions S7o and S8o of the two lights L7 and L8 do not overlap in the emission angle light intensity distribution. As a result, a range having no light intensity is formed between the light intensity distributions S7o and S8o of the two lights L7 and L8, so that the light intensity varies.

  As shown in FIG. 9, the two lights L7 and L8 having the same incident light intensity have different light intensities in the emission angle light intensity distribution as shown in FIG. This is because each of the lights L7 and L8 emitted from the emission surface 62 becomes annular light, so that light having a larger incident angle becomes annular light having a larger diameter, and the light is more dispersed. Therefore, as the incident angle increases, the light intensity decreases in the emission angle light intensity distribution.

  Next, a case where two light beams L7 and L9 whose incident angle ranges partially overlap the incident surface 61 of the light guide 6 will be described with reference to FIGS.

  As shown in FIG. 11, the innermost portions L71 and L91 of the lights L7 and L9 are incident on the incident surface 61 at the minimum incident angles θ71 and θ91, and the outermost portions L72 and L92 of the lights L7 and L9 are the maximum. It is incident on the incident surface 61 at incident angles θ72 and θ92. Therefore, the incident angle ranges R7 and R9 of the respective lights L7 and L9 are the minimum incident angles θ71 and θ91 to the maximum incident angles θ72 and θ92 (θ71 ≦ R7 ≦ θ72, θ91 ≦ R9 ≦ θ92). The lights L7 and L9 incident on the incident surface 61 in a predetermined shape are emitted from the emission surface 62 in the same emission angle ranges R7 and R9 as the incident angle ranges R7 and R9, and then become annular light.

  At this time, the incident angle ranges R7 and R9 of the two lights L7 and L9 partially overlap each other. Specifically, the maximum incident angle θ72 of one light L7 is larger than the minimum incident angle θ91 of the other light L9 (θ71 <θ91 <θ72 <θ92). That is, the maximum incident angle θ72 of one light L7 is included in the incident angle range R9 of the other light L9, and the minimum incident angle θ91 of the other light L9 is included in the incident angle range R7 of the one light L7. Yes. Thereby, as shown in FIG. 12, in the incident angle light intensity distribution, the light intensity distributions S7i and S9i of the two lights L7 and L9 partially overlap each other.

  In such a case, as shown in FIG. 13, in the emission angle light intensity distribution, the light intensity distributions S7o and S9o of the two lights L7 and L9 partially overlap each other. As described above, when the two lights L7 and L9 that are incident on the incident angle ranges R7 and R9 are incident, the light intensity distributions S7o and S9o of the two lights L7 and L9 are partially overlapped in the emission angle light intensity distribution. The light intensity distribution S10o obtained by combining the two lights L7 and L9 becomes a light intensity distribution in which the light intensity between the two light intensity distributions S7o and S9o is made uniform.

  Then, the light which injects into the light guide 6 of the light source device 2 which concerns on this embodiment is demonstrated with reference to FIG.

  As shown in FIG. 14, the incident angle ranges R1 to R6 of the lights L1 to L6 emitted from the respective light source units 31 to 36 are the incident angle ranges R1 to R6 of the lights L1 to L6 from the other light source units 31 to 36. It overlaps with. Thereby, in the incident angle light intensity distribution, the light intensity distributions S1i to S6i of the respective lights L1 to L6 partially overlap with the light intensity distributions S1i to S6i of the other lights L1 to L6. Specifically, it is as follows.

  The incident angle range R1 of the first light L1 and the incident angle range R2 of the second light L2 partially overlap each other. The incident angle range R2 of the second light L2 and the incident angle range R3 of the third light L3 partially overlap. The incident angle range R3 of the third light L3 and the incident angle range R4 of the fourth light L4 partially overlap. The incident angle range R4 of the fourth light L4 and the incident angle range R5 of the fifth light L5 partially overlap each other. The incident angle range R5 of the fifth light L5 and the incident angle range R6 of the sixth light L6 partially overlap.

  Of the incident angle ranges R1 to R6 of the light beams L1 to L6 from the light source units 31 to 36, the minimum incident angles θ21, θ31, θ41, θ51, and θ61 and the maximum incident angles θ12, θ22, θ32, θ42, and θ52 Are included in the incident angle ranges R1 to R6 of the lights L1 to L6 from the other light source units 31 to 36, respectively. Specifically, it is as follows. However, among all the incident angle ranges R1 to R6, the smallest minimum incident angle θ11 and the largest maximum incident angle θ62 are excluded.

  The minimum incident angle θ21 of the second light L2 is included in the incident angle range R1 of the first light. The maximum incident angle θ12 of the first light L1 and the minimum incident angle θ31 of the third light L3 are included in the incident angle range R2 of the second light. The maximum incident angle θ22 of the second light L2 and the minimum incident angle θ41 of the fourth light L4 are included in the incident angle range R3 of the third light.

  The maximum incident angle θ32 of the third light L3 and the minimum incident angle θ51 of the fifth light L5 are included in the incident angle range R4 of the fourth light. The maximum incident angle θ42 of the fourth light L4 and the minimum incident angle θ61 of the sixth light L6 are included in the incident angle range R5 of the fifth light. The maximum incident angle θ52 of the fifth light L5 is included in the incident angle range R6 of the sixth light.

  Thereby, the range which overlapped incident angle range R1-R6 of light L1-L6 from each light source part 31-36 is a range which continues from 0 degree to predetermined angle (theta) 62. Specifically, the range is a range from 0 ° to the largest maximum incident angle θ62 among all the incident angle ranges R1 to R6. Thereby, in the incident angle light intensity distribution, the light intensity distribution S10i obtained by synthesizing the light intensity distributions S1i to S6i of the respective lights L1 to L6 has a light intensity distribution continuously having an intensity from 0 ° to the largest maximum incident angle θ62. It has become.

  Moreover, each light source part 31-36 is radiate | emitted light L1-L6 of different light intensity, respectively. Specifically, in the lights L1 to L6 emitted from the light source units 31 to 36, the light intensity increases as the incident angle increases. That is, the light intensity L6 of the sixth light is the highest and the light intensity of the first light L1 is the lowest.

  Thereby, in the light which combined each light L1-L6, light intensity becomes large, so that an incident angle becomes large. Therefore, in the incident angle light intensity distribution, the light intensity distribution S10i obtained by synthesizing the light intensity distributions S1i to S6i of the respective lights L1 to L6 is a light intensity distribution in which the light intensity increases as the incident angle increases.

  Then, when the incident angle when entering the light guide 6 is divided into a plurality of (two in the present embodiment) sections D1 and D2 for each size, the larger the incident angle, the larger the incident angle. The light intensity per unit angle (= total light intensity / incident angle range) is large. That is, the light intensity per unit angle of the incident angle in the range D1 on the larger incident angle side is larger than the light intensity per unit angle of the incident angle in the range D2 on the smaller incident angle side.

  Next, light emitted from the light guide 6 of the light source device 2 according to the present embodiment will be described with reference to FIG.

  First, in the light incident on the light guide 6, the incident angle ranges R1 to R6 of the light L1 to L6 emitted from the light source units 31 to 36 are the light L1 to L6 from the other light source units 31 to 36. Of the incident angle range R1 to R6. Thereby, in the light emitted from the light guide 6, as shown in FIG. 15, the light intensity distributions S1o to S6o of the respective lights L1 to L6 are the other light L1 to L6 in the emission angle light intensity distribution. It overlaps with the light intensity distributions S1o to S6o.

  Moreover, in the light which injects into the light guide 6, the range which overlap | superposed the incident angle range R1-R6 of light L1-L6 from each light source part 31-36 is the range which continues from 0 degree to predetermined angle (theta) 62. FIG. It has become. Thereby, in the light emitted from the light guide 6, the light intensity distribution S10o of the synthesized light in the emission angle light intensity distribution has a light intensity continuously from an emission angle of 0 ° to a predetermined angle θ. The light intensity distribution.

  Further, in the light incident on the light guide 6, the light intensity of the light obtained by combining the lights L1 to L6 increases as the incident angle increases. Thereby, in the light emitted from the light guide 6, the light intensity distribution S10o of the synthesized light in the emission angle light intensity distribution is a light intensity distribution that is a constant light intensity regardless of the emission angle. Yes.

  As described above, the light source device 2 according to the present embodiment receives the light sources 31 to 36 that emit the lights L1 to L6 and the lights L1 to L6 that are emitted from the light sources 31 to 36. And an optical system 4 that emits light L1 to L6 toward the incident surface 61 of the light guide 6. The plurality of light source units 31 to 36 and the optical system 4 are emitted from the respective light source units 31 to 36. Incident angle ranges R1 to R6, which are ranges of incident angles when the light beams L1 to L6 are incident on the light guide 6, are incident angle ranges R1 to R6 of the light beams L1 to L6 from the other light source units 31 to 36. Configured to overlap R6.

  Moreover, the light source device 2 according to the present embodiment has a plurality of light source units 31 to 36 that emit light L1 to L6 and an incident surface on which the light L1 to L6 emitted from the plurality of light source units 31 to 36 is incident. A light guide body 6 having 61, and incident angle ranges R1 to R1 that are ranges of incident angles when the light beams L1 to L6 emitted from the light source units 31 to 36 are incident on the light guide body 6. R6 overlaps with the incident angle ranges R1 to R6 of the lights L1 to L6 from the other light source units 31 to 36.

  According to such a configuration, the incident angle ranges R1 to R6 of the lights L1 to L6 from the respective light source units 31 to 36 overlap with the incident angle ranges R1 to R6 of the lights L1 to L6 from the other light source units 31 to 36. ing. Thereby, in the light intensity distribution with respect to the emission angle emitted from the light guide 6, the light intensity distributions S1o to S6o of the lights L1 to L6 from the light source parts 31 to 36 are the light from the other light source parts 31 to 36, respectively. It overlaps with the light intensity distributions S1o to S6o of L1 to L6. Therefore, the light intensity distribution S10o of the combined light obtained by combining the light from the plurality of light source units 31 to 36 can be made uniform.

  In the light source device 2 according to the present embodiment, the range in which the incident angle ranges R1 to R6 of the lights L1 to L6 from the light source units 31 to 36 are overlapped is a range that continues from 0 ° to a predetermined angle θ62. It becomes.

  According to such a configuration, in the light intensity distribution with respect to the emission angle emitted from the light guide 6, the light intensity distribution S <b> 10 o of the combined light obtained by combining the lights L <b> 1 to L <b> 6 from the plurality of light source units 31 to 36 is Becomes a light intensity distribution having continuous light intensity from 0 ° to a predetermined angle θ62. Thereby, the light intensity distribution S10o of the combined light obtained by combining the light from the plurality of light source units 31 to 36 can be made more uniform.

  In the light source device 2 according to the present embodiment, the combined light obtained by combining the light from each of the light source units 31 to 36 has a plurality of incident angles when entering the light guide 6 for each size. When divided into the sections D1 and D2, the light intensity per unit angle of the incident angle increases as the incident angle increases.

  Here, the light incident on the light guide 6 becomes light having a larger shape as the incident angle becomes larger, and thus the light having a larger shape is dispersed. Therefore, the light having a larger incident angle has a lower light intensity in the light intensity distribution. . Therefore, according to such a configuration, the larger the incident angle, the higher the light intensity per unit angle of the incident angle. Therefore, in the light intensity distribution with respect to the emission angle emitted from the light guide 6, the range where the emission angle is large. It is suppressing that the light intensity of becomes too small. Therefore, the light intensity distribution S10o of the combined light obtained by combining the lights L1 to L6 emitted from the plurality of light source units 31 to 36 can be made more uniform.

  In the light source device 2 according to the present embodiment, the combined light obtained by combining the lights L1 to L6 from the light source units 31 to 36 has higher light intensity as the incident angle increases.

  According to such a configuration, in the combined light obtained by combining the lights L1 to L6 from the light source units 31 to 36, the light intensity increases as the incident angle increases. In the intensity distribution, the light intensity in the range where the emission angle is large is prevented from becoming too small. Therefore, the light intensity distribution S10o of the combined light obtained by combining the lights L1 to L6 emitted from the plurality of light source units 31 to 36 can be made more uniform.

Second Embodiment
Next, a second embodiment of the light source device will be described with reference to FIGS. In FIGS. 16 and 17, the parts denoted by the same reference numerals as those in FIGS. 1 to 15 represent elements having substantially the same configuration or substantially the same function (action) as the first embodiment. The description will not be repeated.

  The light source device 2 according to the present embodiment is different from the light source device 2 according to the first embodiment in that the plurality of light source units 3 emit light L1 to L6 having the same (substantially the same) light intensity. Yes. 16 and 17, the light source unit 3 is not shown, but in the present embodiment, 36 light source units 3 are provided.

  FIG. 16 shows the incident positions of the lights L <b> 1 to L <b> 6 with respect to the optical incident surface 41 of the optical system 4. Since the beam diameters of the lights L1 to L6 are the same (substantially the same), the optical axes of the lights L1 to L6 are the same distance from the center P1 (the position of the broken line in FIG. 16) on the optical incident surface 41. When positioned, the incident angle ranges of the lights L1 to L6 are the same.

  As shown in FIGS. 16 and 17, one light source unit 3 that emits the first light L1 in the incident angle range R1 (θ11 ≦ R1 ≦ R12) is provided, and the incident angle range R2 (θ21 ≦ R2 ≦). Three light sources 3 that emit the second light L2 that is R22) are provided, and five light sources 3 that emit the third light L3 that is in the incident angle range R3 (θ31 ≦ R3 ≦ R32). Seven light source units 3 that emit the fourth light L4 having the incident angle range R4 (θ41 ≦ R4 ≦ R42) are provided, and the fifth light source unit 3 has the incident angle range R5 (θ51 ≦ R5 ≦ R52). Nine light source units 3 that emit light L5 are provided, and eleven light source units 3 that emit sixth light L6 having an incident angle range R6 (θ61 ≦ R6 ≦ R62) are provided.

  Specifically, the light source unit 3 that emits light having a large incident angle is provided in a larger number. Thereby, in the light which combined each light L1-L6, light intensity becomes large, so that an incident angle becomes large. Accordingly, as shown in FIG. 17, in the incident angle light intensity distribution, the light intensity distribution S10i obtained by synthesizing the light intensity distributions S1i to S6i of the respective lights L1 to L6 has a light intensity distribution that increases as the incident angle increases. It has become.

  The light intensity distribution S10i obtained by combining the light intensity distributions S1i to S6i of the lights L1 to L6 according to the present embodiment is combined with the light intensity distributions S1i to S6i of the lights L1 to L6 according to the first embodiment. It is the same as the light intensity distribution S10i (see FIG. 14). Thereby, in the light emitted from the light guide 6, the light intensity distribution S10o of the synthesized light in the emission angle light intensity distribution becomes a light intensity distribution having a constant light intensity regardless of the emission angle ( FIG. 15).

  Note that the light source device is not limited to the configuration of the above-described embodiment, and is not limited to the above-described effects. It goes without saying that the light source device can be variously modified without departing from the gist of the present invention. For example, the configurations and methods of the plurality of embodiments described above may be arbitrarily adopted and combined (the configurations and methods according to one embodiment may be combined with the configurations and methods according to the other embodiments). Further, it is of course possible to arbitrarily select configurations, methods, and the like according to various modifications described below and adopt them in the configurations, methods, and the like according to the above-described embodiments.

  A plurality of light source devices 2 according to the above-described embodiment are provided, and the light source devices 2 emit light toward the image projection unit 10 in a state where the first to third color lights are separated. However, the light source device is not limited to such a configuration. For example, the light source device may be configured to emit light toward the image projection unit 10 in a state where the first to third color lights are combined.

  Moreover, it is the structure that the three light source devices 2 which concern on the said embodiment are provided. However, the light source device is not limited to such a configuration. For example, one, two, or four or more light source devices may be provided.

  In addition, the light source device 2 according to the embodiment is configured to be used in the image projection device 1. However, the light source device is not limited to such a configuration. For example, the light source device may be configured to be used in an exposure device that performs exposure using light, may be configured to be used in an illumination device that emits light (for example, a spotlight), and may be used as an object. The structure used for the heating apparatus heated by irradiating light may be sufficient.

  Further, the light source device 2 according to the above-described embodiment is configured to include the optical system 4. However, the light source device is not limited to such a configuration. For example, the light source device may not include the optical system 4 and may be configured such that light emitted from the light source unit 3 is directly incident on the incident surface 61 of the light guide 6.

  Moreover, the light source device 2 according to the above embodiment has a configuration in which the light guide 6 is configured to be detachable from the main body 5. However, the light source device is not limited to such a configuration. For example, the light source device may be configured such that the light guide 6 is fixed so that it cannot be attached to and detached from the main body 5, for example, is configured integrally with the main body 5.

  DESCRIPTION OF SYMBOLS 1 ... Image projector, 2, 2R, 2G, 2B ... Light source device, 3, 31-36 ... Light source part, 3a ... Semiconductor laser, 3b ... Collimating lens, 4 ... Optical system, 5 ... Main part, 6 ... Light guide Body 10, image projection unit 11, image optical system 11 a polarization beam splitter 11 b spatial modulation element 11 c dichroic prism 11 d reflection mirror 12 projection optical system 13 image projection main body 13 a DESCRIPTION OF SYMBOLS Connection part 41 ... Optical incident surface 51 ... Connection part 61 ... Incident surface 62 ... Output surface 100 ... Screen

Claims (5)

A plurality of light source units that emit light;
The light emitted from the plurality of light source units is incident, and an optical system that emits the light toward the incident surface of the light guide, and
In the plurality of light source units and the optical system, an incident angle range that is an incident angle range when light emitted from each light source unit is incident on the light guide is an incident angle of light from another light source unit. A light source device configured to overlap the range. A plurality of light source units that emit light;
A light guide having an incident surface on which light emitted from the plurality of light source units is incident,
A light source device in which an incident angle range, which is an incident angle range when light emitted from each light source unit is incident on the light guide, overlaps with an incident angle range of light from another light source unit.   3. The light source device according to claim 1, wherein a range in which incident angle ranges of light from the light source units are overlapped is a range that continues from 0 ° to a predetermined angle.   In the combined light obtained by combining the light from each light source unit, when the incident angle when entering the light guide is divided into a plurality of sections according to size, the section with the larger incident angle is incident. The light source device according to claim 1, wherein the light intensity per unit angle of the corner is large. 5. The light source device according to claim 1, wherein the combined light obtained by combining the light from each of the light source units has a higher light intensity as the incident angle increases.

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