JP2019086532A - Projection type video display device - Google Patents

Abstract

To reduce the size of a projection type video display device by reducing the interval between the bundles of rays emitted from a light source with a simple configuration.SOLUTION: A projection type video display device projecting video images comprises a light source unit 31 and an illumination optical unit. The light source unit 31 includes a first bank group 40, a second bank group 41, and a unit for reducing the interval between the bundles of rays. The first bank group 40 and second bank group 41 respectively have laser diodes 88 generating illumination light arranged in an array. The unit for reducing the interval between the bundles of rays has a first mirror group 42, a second mirror group 43, and a prism group 44, and folds back the bundles of rays emitted from the first bank group 40 and second bank group 41 to reduce the interval between the bundles of rays.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a projection-type image display apparatus, and more particularly to a technology effective for miniaturizing a light source unit of the projection-type image display apparatus.

  In recent years, in a projection type image display apparatus for projecting an image on a screen etc., that is, a projector etc., a semiconductor laser of visible light, a so-called laser diode, has been used as a light source. Things are attracting attention.

  In a projector using this type of light source, simply arranging a plurality of light sources such as a laser diode increases the diameter of a bundle of rays of light such as a projection lens provided behind the light sources, resulting in luminance or brightness. There is a risk that it will be lowered.

  Therefore, as a technique for preventing the decrease in brightness or lightness, for example, a plurality of mirrors are provided, and a beam of light from the light source is bent a plurality of times by the mirrors to reduce the distance between light beams. (See, for example, Patent Document 1).

JP, 2011-107723, A

  However, in the technique of Patent Document 1, as described above, a large number of mirrors are used to fold the light beam from the light source a plurality of times. Therefore, the space etc. which arrange | position many mirrors are needed, and there exists a problem that the light source part which consists of these mirrors and a light source will enlarge. As a result, there is a risk that the size reduction of the projection type image display device may be affected.

  An object of the present invention is to provide a technology capable of miniaturizing a projection type image display apparatus by narrowing the distance between light beam bundles emitted from a light source with a simple configuration.

  The above and other objects and novel features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

  The outline of typical ones of the inventions disclosed in the present application will be briefly described as follows.

  That is, a typical projection type image display apparatus includes a light source unit and an illumination optical unit. The light source unit generates illumination light for projection. The illumination optical unit condenses illumination light generated by the light source unit, makes the illumination light uniform.

  In addition, the light source unit includes a first light source group, a second light source group, and a light flux interval reduction unit. In the first light source group and the second light source unit, light emitting elements that generate illumination light are arranged in an array.

  The luminous flux interval reduction section folds the luminous fluxes emitted from the first light source group and the second light source group to narrow the luminous flux interval.

  In particular, the light beam interval reduction unit includes a prism group, a first mirror group, and a second mirror group. The prism group refracts the ray bundle. The first mirror group is provided on the optical axis of the first light source group, reflects the light flux emitted from the first light source group, and narrows the distance between the light fluxes in the first direction.

  The second mirror group is provided on the optical axis of the second light source group, and reflects the light flux emitted from the second light source group to narrow the distance between the light fluxes in the first direction. The prism group narrows an interval between light fluxes reflected by the first mirror group and the second mirror group in a second direction which is a direction orthogonal to the first direction, and emits the light to the illumination optical unit.

  The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows.

  The projection type image display apparatus can be miniaturized.

FIG. 2 is an explanatory drawing showing an example of the configuration of an optical system in a projection type video display according to Embodiment 1; It is explanatory drawing which shows an example of a structure in the illumination optical system which the projection type video display apparatus of FIG. 1 has. It is a general appearance perspective view in the front direction of the light source part which the illumination optical system of FIG. 2 has. It is a general view perspective view in the back direction of the light source part of FIG. It is a side view in the light source part seen from the arrow A direction of FIG. It is a top view in the light source part seen from the arrow B direction of FIG. FIG. 10 is a schematic perspective view in the front direction of a light source unit according to a second embodiment. It is a general | schematic perspective view in the back direction of the light source part of FIG. It is a top view in the light source part seen from the arrow A direction of FIG. It is a side view in the light source part seen from the arrow B direction of FIG. FIG. 18 is a schematic perspective view in the front direction of a light source unit according to a third embodiment. It is a general view perspective view in the back direction of the light source part of FIG. It is a top view in the light source part seen from the arrow A direction of FIG. It is a side view in the light source part seen from the arrow B direction of FIG. FIG. 20 is a schematic perspective view in the front direction of the light source unit according to the fourth embodiment. It is a general | schematic perspective view in the side direction of the light source part of FIG. It is a top view in the light source part seen from the arrow A direction of FIG. It is a side view in the light source part seen from the arrow B direction of FIG. It is a side view in the light source part seen from the arrow C direction of FIG. FIG. 16 is a schematic perspective view showing another example of the light source unit of FIG. 15 in the front direction. FIG. 21 is a schematic perspective view of the light source unit of FIG. 20 in a side direction. FIG. 21 is a top view of the light source unit as viewed in the direction of arrow A in FIG. 20. It is a side view in the light source part seen from the arrow B direction of FIG. FIG. 21 is a side view of the light source unit as viewed in the direction of arrow C in FIG. 20. FIG. 20 is a schematic perspective view in the front direction of the light source unit according to the fifth embodiment. It is a general view perspective view in the back direction of the light source part of FIG. It is a side view in the light source part seen from the arrow A direction of FIG. FIG. 27 is a top view of the light source unit as viewed in the direction of arrow B in FIG. 26. It is a side view in the light source part seen from the arrow C direction of FIG. FIG. 20 is a schematic perspective view in the front direction of the light source unit according to the sixth embodiment. It is a general | schematic perspective view in the back direction of the light source part of FIG. FIG. 31 is a top view of the light source unit as viewed in the direction of arrow A in FIG. 30. It is a side view in the light source part seen from the arrow B direction of FIG. It is a side view in the light source part seen from the arrow C direction of FIG. FIG. 31 is a schematic perspective view showing another example of the light source unit in FIG. 30 in the front direction. It is a general view perspective view in the back direction of the light source part of FIG. It is a top view in the light source part seen from the arrow A direction of FIG. It is a side view in the light source part seen from the arrow B direction of FIG. It is a side view in the light source part seen from the arrow C direction of FIG. It is a general purpose perspective view which shows the other example in the front direction of the light source part of FIG. FIG. 41 is a schematic perspective view of the light source unit of FIG. 40 in the rear direction. FIG. 41 is a top view of the light source unit as viewed in the direction of arrow A in FIG. 40. It is a side view in the light source part seen from the arrow B direction of FIG. It is a side view in the light source part seen from the arrow C direction of FIG. FIG. 21 is a schematic perspective view in the front direction of a light source unit according to a seventh embodiment. It is a general appearance perspective view in the back direction of the light source part of FIG. It is a top view in the light source part seen from the arrow A direction of FIG. It is a side view in the light source part seen from the arrow B direction of FIG. It is a side view in the light source part seen from the arrow C direction of FIG.

  In all the drawings for describing the embodiment, the same reference numeral is attached to the same member in principle, and the repeated description thereof is omitted.

Embodiment 1
Hereinafter, the embodiment will be described in detail.

<Configuration Example of Optical System of Projection-Type Image Display Device>
FIG. 1 is an explanatory view showing an example of the configuration of an optical system in a projection type video display apparatus 10 according to the first embodiment.

  The projection type video display device 10 is a video display device which projects a video on a screen or the like. The projection-type image display device 10 includes an illumination optical system 30, a color separation optical system, a light modulation unit, and a projection optical system.

  As shown in FIG. 1, the color separation optical system is composed of dichroic mirrors 11a and 11b, reflection mirrors 12a, 12b and 12c, and field lenses 13a, 13b and 13c. This color separation optical system separates the illumination light formed by the illumination optical system 30 into three colors of red (R), green (G), and blue (B), and guides each color light to the light modulation section in the subsequent stage. .

  Specifically, first, the dichroic mirror 11a transmits R light and G light among the three colors of R, G, and B, and reflects B light. The dichroic mirror 11a reflects G light and transmits R light among the two colors of R light and G light.

  Next, in this color separation optical system, the B light reflected by the dichroic mirror 11 a passes through the relay lens 14 a and the reflection mirror 12 a and enters the field lens 13 a. The field lens 13a is a lens that adjusts the incident angle.

  The G light transmitted by the dichroic mirror 11a and further reflected by the dichroic mirror 11b is incident on the field lens 13b. The field lens 13 b is a lens that adjusts the incident angle.

  The R light transmitted through the dichroic mirror 11b passes through the relay lens 14b, the reflection mirror 12b, the relay lens 14c, and the reflection mirror 12c, and enters the field lens 13c. The field lens 13c is a lens that adjusts the incident angle.

  The light modulation unit is composed of liquid crystal panels 15a, 15b, 15c, first polarization filters 16a, 16b, 16c, and second polarization filters 17a, 17b, 17c. The liquid crystal panels 15a, 15b, and 15c are illuminated corresponding to the respective color lights emitted from the color separation optical system.

  The first polarizing filters 16a, 16b, 16c are respectively disposed on the incident side of the liquid crystal panels 15a, 15b, 15c. The second polarizing filters 17a, 17b, 17c are respectively disposed on the emission side of the liquid crystal panels 15a, 15b, 15c.

  The B light reflected by the dichroic mirror 11a is incident on the liquid crystal panel 15a through the field lens 14a and the like, and is illuminated. The G light transmitted by the dichroic mirror 11 a and reflected by the dichroic mirror 11 b is incident on the liquid crystal panel 15 b via the field lens 13 b and the like, and is illuminated.

  The R light transmitted by the dichroic mirrors 11a and 11b is incident on the liquid crystal panel 15c through the field lens 13c and the like, and is illuminated. Each liquid crystal panel 15a, 15b, 15c modulates the spatial intensity distribution of the incident illumination light. Further, the light of the three colors which are respectively incident on the liquid crystal panels 15a, 15b and 15c are modulated in accordance with the drive signal or image signal inputted as an electrical signal.

  At this time, the polarization directions of the illumination light incident on the liquid crystal panels 15a, 15b, 15c are adjusted by the first polarizing filters 16a, 16b, 16c, and the liquid crystal panels 15a, 17b, 17c by the second polarizing filters 17a, 17b, 17c. Modulated light of a predetermined polarization direction is extracted from the modulated light emitted from 15b and 15c. Thus, modulated light of each color corresponding to each is formed.

  The cross dichroic prism 18 combines the modulated light from the light modulation device of each color. The projection lens 19 magnifies the image light of the combined light formed through the cross dichroic prism 18 at a desired magnification, and projects a color image on a screen (not shown).

<Configuration example of illumination optical system>
FIG. 2 is an explanatory view showing an example of the configuration of the illumination optical system 30 of the projection type image display device 10 of FIG.

  The illumination optical system 30 has a light source unit 31 and an illumination optical unit. The illumination optical unit includes a condenser lens 32, concave lenses 33, multi lenses 34 and 35, polarization dichroic mirror 36, collimating lenses 37 and 38, collimating lenses 20 and 21, multi lenses 22 and 23, superimposing lens 24, and a fluorescent wheel 25. , And the diffusion plate 26.

  The light source unit 31 generates illumination light for projection. The illumination optical unit is an optical system that condenses the illumination light generated by the light source unit 31, makes the illumination light more uniform, and irradiates the light modulation unit described above. The luminous flux of the illumination light generated by the light source unit 31 is condensed by the condenser lens 32 and then collimated by the concave lens 33. The collimated light enters the polarization dichroic mirror 36 through the multilenses 34 and 35.

  The multi-lenses 34 and 35 are lenses that enhance the uniformity of the illuminance on the fluorescent wheel 25 and the diffusion plate 26 that are the illumination surfaces. The polarization dichroic mirror 36 is a mirror that divides the light going to the fluorescent wheel 25 and the diffusion plate 26.

  The collimating lenses 37 and 38 condense the light from the polarization dichroic mirror 36 and irradiate the fluorescent wheel 25 with the light. When the light is irradiated, the fluorescent wheel 25 emits fluorescent light and reflects it to the collimating lens 37 side. At this time, collimated lenses 37 and 38 collimate fluorescence, which is diverging light.

  The collimating lenses 20 and 21 are lenses that condense light on the diffusion plate 26. The diffusion plate 26 diffuses coherent laser light such as a laser diode 88, which will be described later, which is a light emitting element, for example, to form incoherent light and reflects it to the collimator lens 21 side. The laser beam generated by the laser diode 88 becomes illumination light. The reflected light is collimated by the collimator lenses 20 and 21.

  The multilenses 22 and 23 are lenses for enhancing the uniformity of the illuminance on the liquid crystal panels 15a, 15b and 15c of FIG. The superimposing lens 24 is a lens that converges light and illuminates the irradiated area of the light modulation unit in FIG. 1.

<Example of configuration of light source unit>
FIG. 3 is a schematic perspective view in the front direction of the light source unit 31 of the illumination optical system 30 of FIG. FIG. 4 is a schematic perspective view of the light source unit 31 of FIG. 3 in the rear direction. FIG. 5 is a side view of the light source unit 31 as viewed in the direction of arrow A in FIG. FIG. 6 is a top view of the light source unit 31 as viewed in the direction of arrow B in FIG. Here, the emission side of the illumination light generated by the light source unit 31 is defined as the front.

  The light source unit 31 includes a first bank group 40, a second bank group 41, a first mirror group 42, a second mirror group 43, and a prism group 44, as shown in FIGS. ing. The first light source group, the first bank group 40, has three laser diode banks 45-47. Similarly, the second bank group 41, which is the second light source group, also has three laser diode banks 48-50.

  The first mirror group 42 has three mirrors 51, and the second mirror group 43 also has three mirrors 55 in the same manner. The prism group 44 has rhythms 59-62.

  The laser diode bank 45 is formed of a rectangular solid, and eight laser diodes 88 serving as light sources are arranged in an array on a surface of the rectangular solid. The surface on which the laser diodes 88 in the laser diode bank 45 are arrayed is referred to as an irradiation surface.

  The laser diode 88 is a semiconductor laser and generates light. In this case, as shown in FIG. 3, eight laser diodes 88 are provided with two laser diodes 88 in the column direction which is the second direction, and four lasers in the row direction which is the first direction. A diode 88 is provided. Here, when the column direction is a first direction, the row direction is a second direction.

  The configuration of the laser diode banks 46 and 47 of the first bank group 40 and the configuration of the laser diode banks 48 to 50 of the second bank group 41 are the same as those of the above-described laser bank diodes 45.

  Here, the first bank group 40 and the second bank group 41 are respectively formed of three laser diode banks, and each laser diode bank includes two laser diodes in the column direction and four laser diodes in the row direction. Although 88 is provided, the number of laser diode banks included in the first bank group 40 and the second bank group 41 and the number of matrixes of the laser diodes 88 are not particularly limited. There is also no limitation on the number of laser diodes in the laser diode bank.

  For example, the first bank group 40 and the second bank group 42 may be configured by one laser diode bank, or may be configured by two laser diode banks.

  The first bank group 40 has a structure in which laser diode banks 45 to 47 in which laser diodes 88 are arranged in 2 columns × 4 rows are vertically stacked in FIG. In this example, the laser diode bank 47 is the lowest layer, and the laser diode bank 46 is stacked above the laser bank diodes 47.

  The laser diode bank 45 is stacked above the laser diode bank 46. Therefore, in the entire first bank group 40, six laser diodes 88 are provided in the column direction, and four laser diode banks 46 are provided in the row direction.

  Similarly, the second bank group 41 also has a structure in which laser diode banks 48 to 50 in which laser diodes 88 are arranged in 2 columns × 4 rows are vertically stacked in FIG. The laser diode bank 50 is the lowest layer, and the laser diode bank 49 is stacked above the laser bank diodes 50.

  The laser diode bank 48 is stacked above the laser diode bank 49. Therefore, six laser diodes 88 are provided in the column direction, and four laser diode banks 46 are provided in the row direction, as in the first bank group 40 as a whole of the second bank group 41. It becomes composition.

  The first bank group 40 and the second bank group 41 are arranged to face each other. In other words, the irradiation surfaces of the laser diode banks 45 to 47 and the irradiation surfaces of the laser diode banks 48 to 50 face the same position.

  The four mirrors 51 of the first mirror group 42 and the four mirrors 55 of the second mirror group 43 each have a rectangular shape. The mirrors 51 are arranged at an angle, for example, about 45 °, with respect to the irradiation surface of the laser diode banks 45 to 47. In other words, the laser diode 88 is disposed at an angle of about 45 ° with respect to the optical axis of the laser diode 88.

  The mirrors 51 are sequentially shifted to correspond to each row of the laser diodes 88 included in the first bank group 40, and the mirrors 51 generate the laser diodes 88 disposed in the column direction. The light is reflected and bent by about 90 degrees to be incident on the prisms 59-62.

  As described above, by reflecting the light generated by the laser diode 88 by the mirror 51, the distance between the light fluxes generated by the laser diodes 88 in the row direction can be narrowed.

  As shown in FIG. 6, the distance between the laser diodes 88 in the row direction, that is, the distance between the light beams in the row direction of the laser diodes 88 is the distance L1, but the distance between the light beams after being reflected by the mirror 51 is the distance The distance L2 may be shorter than L1.

  The mirrors 55 are arranged at an angle, for example, about 45 °, with respect to the irradiation surface of the laser diode banks 48 to 50. The mirrors 55 are sequentially shifted so as to correspond to the respective rows of the laser diodes 88 included in the second bank group 41, and the light generated by the laser diodes 88 is reflected by the respective mirrors 55 and 90 The beam is bent approximately and incident on the prisms 59-62.

  As in the case of the mirror 51, by reflecting the light generated by the laser diode 88 by the mirror 55, the distance between the light fluxes generated by the laser diodes 88 in the row direction can be narrowed.

  The light reflected by the mirror 51 and the mirror 55 is incident on the prism group 44 respectively. The prism group 44 is disposed at right angles to the laser diode banks 45-47, 48-50.

  In the prism group 44, as shown in FIG. 5, a prism 60 is provided below the prism 59, and a prism 61 is provided below the prism 60. Below the prism 61, a prism 62 is provided.

  Also, the prisms 59 to 62 are arranged with their positions shifted so that adjacent prisms do not interfere with each other. By this, even if it is a prism etc. with a large volume, the light source part 31 can be miniaturized.

  The light reflected by the mirror 51 and the mirror 55 is incident on the prisms 59 to 62, respectively. The prisms 59 to 62 refract and output the incident light.

  Specifically, in the prism 59, the light generated by the laser diode 88 at the top of the laser diode bank 45 reflected by the mirror 51 and the light generated by the laser diode 88 above the laser diode bank 48 reflected by the mirror 55 are Each is incident.

  In the prism 60, the light generated by the laser diode 88 below the laser diode bank 45 reflected by the mirror 51, the light generated by the laser diode 88 above the laser diode bank 46 reflected by the mirror 51, the mirror 55 reflected The light generated by the laser diode 88 below the laser diode bank 48 and the light generated by the laser diode 88 above the laser diode bank 49 reflected by the mirror 51 are incident.

  The light generated by the laser diode 88 above the laser diode bank 47 reflected by the mirror 51 and the light generated by the laser diode 88 above the laser diode bank 50 reflected by the mirror 55 are incident on the prism 61, respectively.

  The light generated by the laser diode 88 below the laser diode bank 47 reflected by the mirror 51 and the light generated by the laser diode 88 below the laser diode bank 50 reflected by the mirror 55 are incident on the prism 62, respectively. The light generated by the laser diode 88 under the laser diode banks 46 and 49 reflected by the mirror 51 is not incident on any of the prisms.

  The light fluxes incident on the prism group 44 are respectively refracted by the prisms 59 to 62 to narrow the distance between the light fluxes. Specifically, the distance between the light beam bundles in the column direction is narrowed by the prisms 59 to 62.

  For example, as shown in FIG. 5, the distance between the light fluxes in the column direction before entering the prisms 59 and 60 is the distance L3, but the distance between the light fluxes in the column direction refracted by the prisms 59 and 60 is the distance L3. A distance L4 which is a shorter interval can be set. By this, it is possible to narrow the distance between the ray bundles in the column direction.

  Thus, the distance between the ray bundles in the row direction can be reduced by the mirror 51 and the mirror 55, and the distance between the ray bundles in the column direction can be reduced by the prisms 59 to 62. By narrowing the distance between the light beams, the aperture of the condenser lens 32 of FIG. 2 can be reduced.

  As a result, the condenser lens 32 can be miniaturized. Further, by miniaturizing the condenser lens 32, it is possible to reduce the optical path length of the illumination optical system 30 of FIG. 2, and to miniaturize each component of the illumination optical system 30 and the subsequent condenser lens 32. Can. Thus, the illumination optical system 30 can be reduced in size and weight, and the projection type image display device 10 can be reduced in size.

Second Embodiment
FIG. 7 is a schematic perspective view in the front direction of the light source unit 31 according to the second embodiment. FIG. 8 is a schematic perspective view of the light source unit 31 of FIG. 7 in the rear direction. FIG. 9 is a top view of the light source unit 31 as viewed in the direction of arrow A in FIG. FIG. 10 is a side view of the light source unit 31 as viewed in the direction of arrow B in FIG. Here too, the emission side of the illumination light generated by the light source unit 31 is defined as the front.

<Example of configuration of light source unit>
The light source unit 31 is provided in the illumination optical system 30 as in FIG. 2 of the first embodiment. The light source unit 31 shown in FIGS. 7 to 10 differs from the light source unit 31 shown in FIG. 3 to FIG. After narrowing, the distance between ray bundles in the row direction is being further reduced by the mirror.

  The configuration and arrangement of the first bank group 40, the second bank group 41, the first mirror group 42, and the second mirror group 43 are the same as in FIGS. 3 to 6 of the first embodiment. Therefore, the explanation is omitted.

  As shown in FIGS. 7 to 10, in the light source unit 31, the prism group 44 is composed of prisms 59 to 62, and the prism group 44a is composed of prisms 63 to 66.

  On the irradiation surface side of the laser diode banks 45 to 47, the prisms 59 to 62 of the prism group 44 are respectively provided to face the irradiation surfaces. Further, on the irradiation surface side of the laser diode banks 48 to 50, the prisms 63 to 66 of the prism group 44a are respectively provided to face the irradiation surface. The prisms 59 to 62 and the prisms 63 to 66 are arranged at different positions so that adjacent prisms do not interfere with each other.

  As shown in FIG. 10, light generated by the laser diode 88 above the laser diode bank 48 is incident on the prism 59. The light generated by the laser diode 88 below the laser diode bank 48 and the light generated by the laser diode 88 above the laser diode bank 49 are incident on the prism 60, respectively. The light generated by the laser diode 88 below the laser diode bank 49 is not incident on the prism.

  The light generated by the laser diode 88 in the upper portion of the laser diode bank 50 is incident on the prism 61, and the light generated by the laser diode 88 in the lower portion of the laser diode bank 50 is incident on the prism 62.

  The light generated by the laser diode 88 at the top of the laser diode bank 45 is incident on the prism 63. The light generated by the laser diode 88 below the laser diode bank 45 and the light generated by the laser diode 88 above the laser diode bank 46 are incident on the prism 64, respectively. The light generated by the laser diode 88 below the laser diode bank 46 is not incident on the prism.

  The light generated by the laser diode 88 above the laser diode bank 47 is incident on the prism 65. The light generated by the laser diode 88 below the laser diode bank 47 is incident on the prism 66.

  In this case, the light generated by the laser diode 88 is immediately refracted by the prisms 59 to 62 and the prisms 63 to 66, and then reflected by the first mirror group 42 and the second mirror group 43. ing.

  Thus, by passing the prisms 59 to 62 and 63 to 66 before the light is diffused, the prisms 59 to 62 and 63 to 66, that is, the prism groups 44 and 44a can be miniaturized. Thereby, the illumination optical system 30 can be further miniaturized.

Third Embodiment
FIG. 11 is a schematic perspective view in the front direction of the light source unit 31 according to the third embodiment. FIG. 12 is a schematic perspective view in the back direction of the light source unit 31 of FIG. FIG. 13 is a top view of the light source unit 31 as viewed in the direction of arrow A in FIG. FIG. 14 is a side view of the light source unit 31 as viewed in the direction of arrow B in FIG. Here too, the emission side of the illumination light generated by the light source unit 31 is defined as the front.

<Example of configuration of light source unit>
The light source unit 31 is provided in the illumination optical system 30 as in FIG. 2 of the first embodiment. As shown in FIGS. 11 to 14, the light source unit 31 includes a first bank group 40, a second bank group 41, a first mirror group 42, a second mirror group 43, and prism groups 44 and 44a. Have.

  The first bank group 40 and the second bank group 41 have the laser diode banks 45 to 47 and the laser diode banks 48 to 50 as in FIGS. 7 to 10 of the second embodiment.

  In the second embodiment, the laser diode banks 45 to 47 and 48 to 50 are respectively stacked in the vertical direction in FIG. 7, but in the case of the light source unit 31 in the third embodiment, FIG. The laser diode banks 45 to 47 and the laser diode banks 48 to 50 are stacked in the horizontal direction in FIG.

  Therefore, in this case, the laser diode banks 45 to 47 and the laser diode banks 48 to 50 are each provided with four laser diodes 88 in the column direction and two laser diodes 88 in the row direction. Become.

  The prism group 44 is composed of prisms 59 and 60, and the prism group 44a is composed of prisms 64 and 65. The first mirror group 42 is composed of six mirrors 51, and the second mirror group 43 is composed of six mirrors 55.

  The prism group 44 is attached to the irradiation surface side of the laser diode banks 45 to 46, and the long sides of the prisms 59 are arranged to be orthogonal to the long sides of the laser diode banks 45 to 46.

  Below the prism 59, a prism 60 is provided. Also in the prism 60, the long side of the prism 60 is arranged to be orthogonal to the long side of the laser diode banks 45-46.

  The prism group 44a is attached to the irradiation surface of the laser diode banks 48 to 50, and the long sides of the prisms 64 are arranged to be orthogonal to the long sides of the laser diode banks 48 to 50.

  Below the prism 64, a prism 65 is provided. Also in the prism 65, the long side is arranged to be orthogonal to the long side of the laser diode banks 48 to 50, respectively.

  The arrangement of the mirror 51 and the mirror 55 is the same as in FIGS. 4 to 6 of the first embodiment, and an angle of, for example, about 45 ° is provided to the irradiation surface of the laser diode banks 45 to 47 and 48 to 50. Are arranged in a staggered fashion.

  The prisms 59 refract the light of the top two rows of laser diodes 88 of the laser diode banks 45-47 to narrow the spacing of the light bundles. The prism 60 refracts the light from the lower two rows of laser diodes 88 of the laser diode banks 45-47 to narrow the spacing of the light fluxes. This can reduce the number of prisms.

  The prisms 64 refract the light of the top two rows of laser diodes 88 of the laser diode banks 48-50 to narrow the spacing of the light fluxes. The prisms 65 refract the light of the laser diodes 88 in the lower two rows of the laser diode banks 48-50 to narrow the spacing of the light fluxes.

  After the distance between the light beam bundles in the column direction is narrowed by the prisms 59 and 60 and the prisms 64 and 65, the distance between the light beam bundles in the row direction is narrowed by the mirrors 51 and 55, and the light beam is emitted to the condenser lens 32.

  In this case, in addition to the same effect as that of the first embodiment, the prisms 59, 60, 64, 65 can use the same type of prism. As a result, the cost of the light source unit 31 can be reduced.

Embodiment 4
FIG. 15 is a schematic perspective view in the front direction of the light source unit 31 according to the fourth embodiment. FIG. 16 is a schematic perspective view of the light source unit 31 of FIG. 15 in the side direction. FIG. 17 is a top view of the light source unit 31 as viewed in the direction of arrow A in FIG. FIG. 18 is a side view of the light source unit 31 as viewed in the direction of arrow B in FIG. FIG. 19 is a side view of the light source unit 31 as viewed in the direction of arrow C in FIG. Here too, the emission side of the illumination light generated by the light source unit 31 is defined as the front.

<Example of configuration of light source unit>
In the first to third embodiments, the irradiation surface of the first bank group 40 and the irradiation surface of the second bank group 41 are disposed to face each other, but the light source unit 31 of the fourth embodiment is different from the first to third embodiments. For example, the first bank group 40 and the second bank group 41 do not face each other.

  The light source unit 31 shown in FIGS. 15 to 19 includes a first bank group 40, a second bank group 41, a mirror group 80, and prism groups 44 and 44a. The configurations of the first bank group 40 and the second bank group 41 are the same as in FIG. 11, but in the light source unit 31 shown in FIGS. 15 to 19, the second bank above the first bank group 40 The group 41 is laminated.

  That is, in the first bank group 40, laser diode banks 45 to 47 are arranged in the horizontal direction in FIG. 15, and in the second bank group 41, the laser diode banks 48 to 50 are in the horizontal direction in FIG. Each is arranged.

  The second bank group 41 is stacked above the first bank group 40. That is, the laser diode bank 48 is disposed above the laser diode bank 45, and the laser diode bank 49 is disposed above the laser diode bank 46. The laser diode bank 50 is disposed above the laser diode bank 47.

  Further, on the irradiation surface side of the laser diode banks 45 to 47, the prisms 59 and 60 constituting the prism group 44 are provided at different positions so as not to interfere with each other. On the irradiation surface side of the laser diode banks 48 to 50, the prisms 64 to 65 constituting the prism group 44a are provided at different positions so as not to interfere with each other.

  The mirror group 80 is composed of six mirrors 52. The arrangement of the mirrors 52 is the same as that of the first to third embodiments, and is sequentially shifted with an angle of, for example, about 45 ° to the irradiation surface of the laser diode banks 45 to 47, 48 to 50. ing.

  In the prism group 44a, the prism 66 refracts the light of the laser diodes 88 in the upper row of the laser diode banks 48-50 to narrow the spacing of the light fluxes. The prism 65 refracts the light of the two rows of laser diodes 88 of the laser diode banks 48 to 50 to narrow the distance between light fluxes.

  The prisms 64 refract the light of the lower two rows of laser diodes 88 of the laser diode banks 48-50 to narrow the spacing of the light fluxes. The light from the top row of laser diodes 88 of the laser diode banks 45-47 is reflected by the mirror 52 without being incident on the prisms.

  The prism 59 refracts the light of the laser diodes 88 in the second and third rows of the laser diode banks 45 to 47 to narrow the distance between light fluxes. The prism 60 refracts the light of the laser diode 88 in the fourth row of the laser diode banks 45 to 47 to narrow the distance between light fluxes.

  The light beam bundle whose distance in the column direction is narrowed by the prism groups 44 and 44a is reflected by the mirror 52 and bent, so that the distance in the row direction is narrowed and is emitted to the condenser lens 32 of FIG.

  As described above, by forming the first bank group 40 and the second bank group 41 in a stacked structure, the number of prisms can be reduced as compared with the second embodiment. In addition, the diameter of the condenser lens 32 can be reduced, which can contribute to the miniaturization of the condenser lens.

<Another Configuration Example of Light Source Unit>
FIG. 20 is a schematic perspective view showing another example of the light source unit 31 of FIG. 15 in the front direction. FIG. 21 is a schematic perspective view in the side direction of the light source unit 31 of FIG. FIG. 22 is a top view of the light source unit 31 as viewed in the direction of arrow A in FIG. FIG. 23 is a side view of the light source unit 31 as viewed in the direction of arrow B in FIG. FIG. 24 is a side view of the light source unit 31 as viewed in the direction of arrow C in FIG. Here too, the emission side of the illumination light generated by the light source unit 31 is defined as the front.

  The light source unit 31 shown in FIGS. 20 to 24 differs from the light source unit 31 shown in FIGS. 15 to 19 in the number and arrangement of prisms. In this case, the prism group 44 includes prisms 59 to 61, and the prism group 44a includes prisms 64 to 66.

  The configuration and arrangement of the other first bank group 40, second bank group 41, and mirror group 80 in the light source unit 31 are the same as those in FIGS.

  The prism group 44 is disposed to face the irradiation surface of the first bank group 40. In the prism group 44, the prism 59 is disposed to face the irradiation surface of the first bank group 40, and the prism 60 is disposed behind the prism 59. Behind the prism 60, a prism 61 is disposed.

  The prism group 44 a is disposed to face the irradiation surface of the second bank group 41. In the prism group 44 a, the prism 64 is disposed to face the irradiation surface of the second bank group 41, and the prism 65 is disposed behind the prism 64. Behind the prism 65, a prism 66 is disposed.

  The light generated by the laser diode banks 45 to 47 and the laser diodes 88 of the laser diode banks 48 to 50 is refracted by the prisms 59 to 61 and the prisms 64 to 66, and the distance between the light fluxes in the column direction is narrowed.

  The bundle of rays in which the distance in the column direction is narrowed is reflected and bent by the six mirrors 52, so that the distance in the row direction is narrowed and is emitted to the condenser lens 32 of FIG.

  Also by the above, the aperture of the condenser lens 32 can be reduced, which can contribute to the miniaturization of the condenser lens.

  Moreover, since the light source unit 31 shown in FIG. 20 can make the diameter of the light flux incident on the condenser lens 32 smaller than that of the light source unit 31 shown in FIG. 15, the condenser lens 32 can be further miniaturized. It becomes possible.

Fifth Embodiment
FIG. 25 is a schematic perspective view in the front direction of the light source unit 31 according to the fifth embodiment. FIG. 26 is a schematic perspective view of the light source unit 31 of FIG. 25 in the rear direction. FIG. 27 is a side view of the light source unit 31 as viewed in the direction of arrow A in FIG. FIG. 28 is a top view of the light source unit 31 as viewed in the direction of arrow B in FIG. FIG. 29 is a side view of the light source unit 31 as viewed in the direction of arrow C in FIG. Here too, the emission side of the illumination light generated by the light source unit 31 is defined as the front.

<Example of configuration of light source unit>
The light source unit 31 shown in FIGS. 25 to 29 in the fifth embodiment has the same configuration as the light source unit 31 shown in FIG. 11 of the third embodiment, but the first bank group 40 and the second bank The arrangement of group 41 is different.

  In the light source unit 31 of FIG. 11, the irradiation surfaces of the laser diode banks 45 to 47 of the first bank group 40 and the irradiation surfaces of the laser diode banks 48 to 50 of the second bank group 41 face each other in front. It was arranged.

  On the other hand, in the case of the light source unit 31 shown in FIGS. 25 to 29, the first bank group 40 and the second bank group 41 are opposed to each other, but the irradiation surface of the laser diode bank 45 to 47 and the laser diode The positions of the banks 48 to 50 with respect to the irradiation surface are arranged to be shifted in the vertical direction in FIG.

  The configuration and arrangement of the first bank group 40, the second bank group 41, and the prism groups 44 and 44a are the same as in FIG. 11, but the arrangement of the first mirror group 42 and the second mirror group 43 , It is different from FIG.

  The first mirror group 42 has six mirrors 51, and the second mirror group 43 also has six mirrors 55. Then, as the laser diode banks 45 to 47 and the laser diode banks 48 to 50 are vertically displaced in FIG. 25, the mirrors 51 and 55 are also vertically displaced in FIG. Each is arranged.

  The six mirrors 51 of the first mirror group 42 are sequentially shifted so as to correspond to each column direction of the laser diodes 88 in the laser diode banks 45 to 47 of the first bank group 40.

  Further, the six mirrors 55 of the second bank group 41 are sequentially shifted so as to correspond to each column direction of the laser diodes 88 in the laser diode banks 48 to 50 of the second bank group 41.

  As described above, by arranging the mirrors 51 and 55 in a cross shape as shown in FIG. 28 so as to correspond to each row of the laser diodes 88, it is possible to improve the light collection efficiency of the light flux.

  The mirror 55 bends the beam bundle in the row direction of the laser diode banks 48 to 50 whose distance is narrowed by the prisms 64 and 65 and causes the beam bundle to be incident on the condenser lens 32. The mirror 51 bends the beam bundle in the row direction of the laser diode banks 45 to 47 whose distance is narrowed by the prisms 59 and 60 and makes the ray bundle enter the condenser lens 32.

Sixth Embodiment
FIG. 30 is a schematic perspective view in the front direction of the light source unit 31 according to the sixth embodiment. FIG. 31 is a schematic perspective view of the light source unit 31 of FIG. 30 in the rear direction. 32 is a top view of the light source section 31 as viewed in the direction of arrow A in FIG. FIG. 33 is a side view of the light source unit 31 as viewed in the direction of arrow B in FIG. FIG. 34 is a side view of the light source unit 31 as viewed in the direction of arrow C in FIG. Here too, the emission side of the illumination light generated by the light source unit 31 is defined as the front.

<Example of configuration of light source unit>
In the sixth embodiment, in the light source unit 31, the first bank group 40 and the second bank group 41 are arranged in an L shape as viewed from above as shown in FIG. The first bank group 40 and the second bank group 41 each have the same configuration as that of FIG. 25 of the fifth embodiment.

  As described above, in the light source unit 31, as shown in FIGS. 30 to 34, the first bank group 40 and the second bank group 41 are arranged in an L shape. Further, the first bank group 40 and the second bank group 41 are provided vertically offset in FIG.

  The prism group 44 is composed of prisms 90 to 95, and the prism group 44a is composed of prisms 96 to 101. The prism group 44 is provided on the irradiation surface side of the first bank group 40. In the prism group 44, the prism 90 is provided above the irradiation surface of the first bank group 40, and the prism 91 is provided below the prism 90.

  Behind the prisms 90 and 91, prisms 92 and 93 are provided, respectively. A prism 94 is provided behind the prism 92, and a prism 95 is provided behind the prism 93.

  The prism group 44 a is provided on the irradiation surface side of the second bank group 41. In the prism group 44 a, the prism 96 is provided above the irradiation surface of the second bank group 41, and the prism 97 is provided below the prism 96.

  Behind the prisms 96 and 97, prisms 98 and 99 are provided, respectively. A prism 100 is provided behind the prism 98, and a prism 101 is provided behind the prism 99.

  The prism group 44 refracts ray bundles in the row direction in the laser diode banks 45 to 47 to narrow the spacing of the ray bundles. The prism group 44a refracts the ray bundles in the row direction in the laser diode banks 48 to 50 to narrow the distance between the ray bundles.

  A mirror 54 is provided on the irradiation surface side of the first bank group 40. The mirror 54 is disposed at an angle of, for example, 45 ° with respect to the irradiation surface of the first bank group 40. The mirror 54 reflects the light flux emitted from the prisms 90 to 95, bends it about 90 degrees, and makes it enter the condenser lens 32 of FIG.

  As shown in FIG. 30, the prisms 98 to 101 provided on the side of the second bank group 41 refract light beams so as to pass through the upper side of the mirror 54 and to be incident on the condenser lens 32 as it is and to be emitted.

  Thus, by arranging the first bank group 40 and the second bank group 41 in an L shape, for example, the laser diode banks 45 to 47 can be brought close to the laser diode banks 48 to 50. Thereby, the heat dissipation mechanism etc. which are attached to laser diode banks 45-47 and laser diode banks 48-50 can be arranged efficiently.

  For example, when the first bank group 40 and the second bank group 41 are disposed to face each other, the distance between the first bank group 40 and the second bank group 41 is large, and the heat dissipation mechanism In the L-shaped arrangement, the heat dissipation mechanism can be miniaturized.

  As a result, the light source unit 31 can be further miniaturized, which contributes to cost reduction due to the reduction in the number of parts used.

<Other Configuration Example 1 of Light Source Unit>
FIG. 35 is a schematic perspective view showing another example of the light source unit 31 of FIG. 30 in the front direction. FIG. 36 is a schematic perspective view of the light source unit 31 of FIG. 35 in the rear direction. FIG. 37 is a top view of the light source unit 31 as viewed in the direction of arrow A in FIG. FIG. 38 is a side view of the light source unit 31 as viewed in the direction of arrow B in FIG. FIG. 39 is a side view of the light source unit 31 as viewed in the direction of arrow C in FIG. Here too, the emission side of the illumination light generated by the light source unit 31 is defined as the front.

  In the light source unit 31 shown in FIGS. 30 to 34 described above, the first bank group 40 and the second bank group 41 arranged in an L shape are arranged to be shifted in the vertical direction in FIG. 30, respectively. However, in the light source unit 31 shown in FIGS. 35 to 39, the first bank group 40 and the second bank group 41 are arranged without being shifted.

  Furthermore, in the first bank group 40 in FIGS. 30 to 34, the laser diode banks 45 to 47 are stacked in the horizontal direction in FIG. 30, but in the example shown in FIGS. The laser diode banks 45 to 47 of the first bank group 40 are stacked in the vertical direction in FIG. The laser diode banks 48 to 48 of the second bank group 40 are also stacked in the vertical direction in FIG.

  In other words, the laser diode banks 45 to 47 and the laser diode banks 48 to 50 shown in FIGS. 35 to 39 are 90 ° to the laser diode banks 45 to 47 and the laser diode banks 48 to 50 shown in FIGS. It rotates and is stacked vertically. Therefore, the polarization of the light flux is different by 90 °.

  In addition, as shown in FIG. 37, the prisms 90 to 95 constituting the prism group 44 refract ray bundles in the row direction in the laser diode banks 45 to 47 to narrow the distance between the ray bundles, and The light is collected at the central portion of the bank group 40 and incident on the condenser lens 32 of FIG.

  The prisms 96 to 101 constituting the prism group 44a refract ray bundles in the row direction in the laser diode banks 48 to 50 as shown in FIG. The light is collected in a portion out of the central portion of the group 40 and made incident on the condenser lens 32. In the example of FIG. 37, an example is shown in which the light beam bundle is offset from the central portion to the irradiation surface side of the first bank group 40 and collected.

  That is, the prism group 44 a refracts and emits the light beam bundle of the second bank group 41 so as to pass through the right side of the mirror 54 in FIG. 35 and enter the condenser lens 32 as it is.

  Also by this, since the heat dissipation mechanism can be miniaturized, the light source unit 31 can be further miniaturized, which can also contribute to cost reduction due to the reduction of the number of parts used.

Another Configuration Example 2 of the Light Source Unit
FIG. 40 is a schematic perspective view showing another example of the light source unit 31 of FIG. 35 in the front direction. FIG. 41 is a schematic perspective view of the light source unit 31 of FIG. 40 in the rear direction. FIG. 42 is a top view of the light source unit 31 as viewed in the direction of arrow A in FIG. FIG. 43 is a side view of the light source unit 31 as viewed in the direction of arrow B in FIG. FIG. 44 is a side view of the light source unit 31 as viewed in the direction of arrow C in FIG. Here too, the emission side of the illumination light generated by the light source unit 31 is defined as the front.

  The light source unit 31 shown in FIGS. 40 to 44 differs from the light source unit 31 in FIGS. 35 to 39 in the arrangement position of the mirror 54. In the light source unit 31 shown in FIGS. 40 to 44, the first bank group 40 and the prism group 44, and the second bank group 41 and the prism group 44a have the same configuration.

  The first bank group 40, the prism group 44 and the second bank group 41, and the prism group 44a have the same configuration as that of the first bank group 40 and the prism group 44 in FIGS.

  The first bank group 40 and the second bank group 41 are arranged in an L shape as viewed from above as shown in FIG. The polarizations of light beams emitted from the prism group 44 and the prism group 44a are in the same direction.

  In this case, the prisms 96 to 101 constituting the prism group 44a are the same as in FIG. 37, but in the case of FIG. 37, the light flux is offset from the center to the irradiation surface side of the first bank group 40. 42, in the case of FIG. 42, the prism group 44a gathers the light beam offset from the central portion to the side opposite to the irradiation surface side of the first bank group 40 and causes it to be incident on the condenser lens 32.

  That is, in the case of the light source unit 31 of FIGS. 40 to 44, the prism group 44a passes the light flux of the second bank group 41 to the left of the mirror 54 in FIG. It refracts and emits.

  Also by this, since the heat dissipation mechanism can be miniaturized, the light source unit 31 can be further miniaturized, which can also contribute to cost reduction due to the reduction of the number of parts used.

Seventh Embodiment
FIG. 45 is a schematic perspective view in the front direction of the light source unit 31 according to the seventh embodiment. FIG. 46 is a schematic perspective view of the light source unit 31 of FIG. 45 in the rear direction. FIG. 47 is a top view of the light source section 31 as viewed in the direction of arrow A in FIG. FIG. 48 is a side view of the light source section 31 as viewed in the direction of arrow B in FIG. FIG. 49 is a side view of the light source unit 31 as viewed in the direction of arrow C in FIG. Here too, the emission side of the illumination light generated by the light source unit 31 is defined as the front.

<Example of configuration of light source unit>
The light source unit 31 shown in FIGS. 45 to 49 of the seventh embodiment is different from the light source units of FIGS. 35 to 39 in the sixth embodiment in the characteristics of the dichroic mirror 54 and the second bank group 41. It is a laminated structure of the laser diode banks 48-50 which comprise.

  The laser diode banks 48 to 50 shown in FIG. 35 to FIG. 39 are stacked in the vertical direction by rotating 90 degrees with respect to the laser diode banks 48 to 50 shown in FIG. 30 to FIG. Therefore, the polarization of the light flux is different by 90 °.

  The dichroic mirror 54 shown in FIGS. 45 to 49 uses a dichroic mirror having polarization characteristics, that is, a so-called polarization dichroic mirror. The dichroic mirror 54 having the polarization characteristic reflects the light generated from the laser diode banks 45 to 47 of the first bank group 40 as shown in FIG. 47, and from the laser diode banks 48 to 50 of the second bank group 41. The generated light is transmitted.

  Therefore, the light beam bundle in the row direction of the first bank group 40 is refracted and narrowed by the prism group 44, and after being reflected by the dichroic mirror 54, enters the condenser lens 32. Further, the light beam bundle in the row direction of the second bank group 41 is refracted and narrowed by the prism group 44 a, passes through the dichroic mirror 54, and then is incident on the condenser lens 32.

  Instead of the dichroic mirror 54, PBS (Polarizing Beam Splitter) may be used.

  Also by this, since the heat dissipation mechanism can be miniaturized, the light source unit 31 can be further miniaturized, which can also contribute to cost reduction due to the reduction of the number of parts used.

  As mentioned above, although the invention made by the present inventor was concretely explained based on an embodiment, the present invention is not limited to the above-mentioned embodiment, and can be variously changed in the range which does not deviate from the gist. Needless to say.

  The present invention is not limited to the above-described embodiment, but includes various modifications. For example, the above-described embodiments are described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations.

  Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. . In addition, it is possible to add, delete, and replace other configurations in part of the configurations of the respective embodiments.

10 Projection type image display device 11a Dichroic mirror 11b Dichroic mirror 12a Reflection mirror 13a Field lens 13b Field lens 13c Field lens 14a Field lens 15a Liquid crystal panel 15b Liquid crystal panel 15c Liquid crystal panel 16a First polarizing filter 17a Second polarizing filter 18 Cross dichroic prism 19 Projection lens 20 Collimator lens 21 Collimator lens 22 Multi lens 24 Superimposing lens 25 Fluorescent wheel 26 Diffusion plate 30 Illumination optical system 31 Light source unit 32 Condenser lens 33 Concave lens 34 Multi lens 36 Polarization dichroic mirror 37 Collimator lens 40 First bank group 41 Second bank group 42 first mirror group 43 second mirror group 44 prism group 44a prism group 45 to 47 ray Diode bank 48-50 laser diode bank 51 mirror 52 mirror 54 a dichroic mirror 54 mirror 55 mirror 59 to 66 prism 80 mirrors 88 laser diode 90 to 101 prisms

Claims (11)

It is a projection type video display device which projects a video, and
A light source unit that generates illumination light for projection;
An illumination optical unit that condenses illumination light generated by the light source unit, makes the illumination light uniform, and emits the illumination light;
Equipped with
The light source unit is
A first light source group and a second light source group in which light emitting elements generating the illumination light are arranged in an array;
A luminous flux interval reduction unit for folding the luminous flux emitted from the first light source group and the second light source group to narrow the luminous flux interval;
Projection type video display device. In the projection type video display device according to claim 1,
The luminous flux interval reduction unit
A prism group that refracts a ray bundle;
A first mirror group, provided on the optical axis of the first light source group, for reflecting the light flux emitted from the first light source group and narrowing the distance between the light fluxes in a first direction;
A second mirror group provided on the optical axis of the second light source group, and reflecting the light flux emitted from the second light source group to narrow the distance between the light fluxes in the first direction;
Have
The prism group narrows an interval between the light fluxes reflected by the first mirror group and the second mirror group in a second direction which is a direction orthogonal to the first direction and emits the light to the illumination optical unit. A projection type video display device. In the projection type video display device according to claim 2,
The first light source group and the second light source group are provided in such a manner that irradiation surfaces which are surfaces on which the light emitting elements are disposed face each other,
The projection type video display apparatus, wherein the prism group is provided to be perpendicular to the first light source group and the second light source group. In the projection type video display device according to claim 1,
The luminous flux interval reduction unit
A first prism group provided on an optical axis of the first light source group, and refracting a light flux emitted from the first light source group to narrow a distance between the light fluxes in a first direction;
A second prism group provided on an optical axis of the second light source group, and refracting a light flux emitted from the second light source group to narrow a distance between the light fluxes in the first direction;
The light beam bundle emitted from the first prism group and the second prism group is reflected to narrow the distance between the light beam bundles in a second direction which is a direction orthogonal to the first direction, and thereby the illumination optics Mirror group to be emitted to the department,
Projection type video display device. In the projection type video display device according to claim 4,
The projection type video display apparatus, wherein the first light source group and the second light source group are provided in such a manner that irradiation surfaces which are surfaces on which the light emitting elements are disposed face each other. In the projection type video display device according to claim 4,
The projection type video display apparatus, wherein the first light source group and the second light source group are arranged such that the irradiation surfaces, which are the surfaces on which the light emitting elements are arranged, are on the same plane. In the projection type video display device according to claim 4,
The projection type video display apparatus, wherein the first light source group and the second light source group are provided in an L-shaped irradiation surface which is a surface on which the light emitting element is disposed. In the projection type video display device according to claim 7,
The mirror group reflects the light flux emitted from the second prism group, narrows the spacing of the light flux in the second direction which is a direction orthogonal to the first direction, and the illumination optical unit Projection-type image display device that emits light. In the projection type video display device according to claim 7,
The mirror group is a mirror having a polarization characteristic, reflects the light flux emitted from the second prism group and emits the light flux to the illumination optical unit, and the light flux emitted from the second prism group The projection type video display apparatus which permeate | transmits a bundle | flux and radiate | emits it to the said illumination optical part. In the projection type video display device according to claim 7,
In the first light source group, the number of light emitting elements in the row direction is the same as the number of light emitting elements in the column direction that the second light source group has, and the number of light emitting elements in the column direction is the second Are arranged to be the same as the number of light emitting elements in the row direction of the light source group of
The first prism group refracts the light flux emitted from the first light source group, narrows the distance between the light fluxes in a first direction, and emits the light flux to the illumination optical unit.
The second prism group refracts the light flux emitted from the second light source group, narrows the distance between the light fluxes in the second direction which is a direction orthogonal to the first direction, and thus performs the illumination. Projection-type image display device that emits light to the optical unit. The projection type video display apparatus according to any one of claims 2 to 9.
The projection type video display apparatus whose said light emitting element which each of said 1st light source group and said 2nd light source group has is a laser diode.

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