JP2011043703A - Illuminator and projection type image display device using the illuminator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminator capable of yielding bright illuminating light with excellent illumination efficiency. <P>SOLUTION: The illuminator 10A includes a plurality of laser array light sources 11 having a plurality of semiconductor laser elements 11b emitting a laser beam L having nearly single wavelength in a line in a column direction and installed along the column direction of the plurality of semiconductor laser elements 11b, and a dichroic mirror 12DM (or a total reflection mirror 12M) having a plurality of rectangular mirror parts 12a and 12b corresponding to the number of the plurality of laser array light sources 11 and installed in a state where the plurality of rectangular mirror parts 12a and 12b are orthogonally superposed alternately in a row direction perpendicular to the column direction of the laser array light source 11. The illuminator 10A is constituted by opposing the plurality of laser array light sources 11 to positionally differ in the row direction and alternately separate while putting the dichroic mirror 12DM (or the total reflection mirror 12M) in between. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an illumination device capable of illuminating a light modulation element with bright illumination light with good illumination efficiency using a laser array light source in which a plurality of semiconductor laser elements are arranged in a line in one direction, and the illumination The present invention relates to a projection type video display apparatus using the apparatus.

  Conventionally, an illumination device applied to a projection-type image display device that projects image light emitted from a light modulation element such as a liquid crystal panel or a DMD (Digital Micromirror Device) by a projection optical system and projects the light onto a screen is white light. White light sources such as xenon lamps, halogen lamps, and ultra-high pressure mercury lamps are used. White light sources using these lamps have a relatively short lamp life and are difficult to light up instantly. There is a problem in that the sex range is narrow.

  Therefore, in order to solve the above-mentioned problems in the white light source using a lamp, a laser array light source having a long life and capable of instantaneous lighting is used for R (red) light, G (green) light, B There are illumination optical devices and projectors that can emit illumination light having a wide color reproducibility range by combining R, G, and B monochromatic light emitted from laser array light sources for (blue) light ( For example, see Patent Document 1).

9A and 9B are a plan view and side views showing a conventional illumination optical device.
FIG. 10 is a perspective view showing a state in which light is scattered at the X-shaped intersection of the dichroic mirror in the conventional illumination optical apparatus.

  The conventional illumination optical device 100 shown in FIGS. 9A and 9B is disclosed in Patent Document 1, and will be described briefly with reference to Patent Document 1.

  As shown in FIGS. 9A and 9B, in the conventional illumination optical apparatus 100, the laser array light source 101R for R (red) light, the laser array light source 101G for G (green) light, and the B (blue) light The R light Lr, G light Lg, and B light Lb respectively emitted from the laser array light source 101B pass through the optical members 102R, 102G, and 102B to be converted into parallel luminous fluxes, and then the R light Lr, G light Lg, and B light. Lb is incident on a color synthesizing element (hereinafter referred to as a dichroic mirror) 103 in which the dichroic films 103r and 103b intersect in an X shape.

  The R light Lr, G light Lg, and B light Lb are color-combined by the dichroic mirror 103 to become white light Lrgb, and the white light Lrgb is made uniform by the homogenizer 104 and then emitted to the irradiated portion 105 side. Has been.

  In addition, the above-mentioned Patent Document 1 also discloses a projector using a conventional illumination optical device. In this projector, although not shown here, white light emitted from the conventional illumination optical device is not shown. It is described that a light modulator (light valve) is irradiated by a field lens, and image light emitted from the light modulator is enlarged and projected on a screen by a projection lens.

Japanese Patent No. 397356

  By the way, according to the conventional illumination optical device 100, the lamps for the life, the instantaneous lighting, the color reproducibility range, and the like can be obtained by using the laser array light sources 101R, 101G, and 101B for R light, G light, and B light. Although the laser light source 101R, 101G, 101B for R light, G light, and B light has a small laser output and is used for R light, G light in the illumination optical device 100, although it can be improved over the white light source using Since the laser array light sources 101R, 101G, and 101B for B and B light are installed for each of R, G, and B, the brightness of the R light Lr, the G light Lg, and the B light Lb is dark, and the R There is a problem that the brightness of the white light Lrgb obtained by color-combining the light Lr, the G light Lg, and the B light Lb with the dichroic mirror 103 naturally becomes dark.

  Further, as shown in FIG. 10, in the conventional illumination optical apparatus 100, R light Lr, G light Lg, and B light emitted from laser array light sources 101R, 101G, and 101B for R light, G light, and B light. When Lb is incident on the dichroic mirror 103, the R light Lr, G light Lg, and B light Lb are scattered at the X-shaped intersection portion 103x that intersects the dichroic films 103r and 103b in an X shape. There is also a problem that uneven illuminance of the white light Lrgb color-combined by the mirror 103 occurs.

  Accordingly, there is provided an illuminating device using a plurality of semiconductor laser elements, which has good illumination efficiency and can illuminate light modulation elements with bright illumination light without uneven illumination, and a projection type image display device using the illuminating device. The purpose is to do.

1) In order to achieve the above object, an illuminating device according to claim 1 includes a plurality of laser array light sources in which a plurality of semiconductor laser elements are arranged in a line so that substantially single-wavelength laser light is emitted in the same direction. ,
Arranged to correspond to the plurality of laser array light sources, and provided so as to be inclined at a predetermined angle with respect to the longitudinal direction of each light beam of the laser light emitted from the semiconductor laser elements arranged in the row, A plurality of reflecting portions for reflecting the laser light incident on the laser light incident surface;
With
The plurality of laser array light sources are arranged in a direction orthogonal to the direction of arrangement of the semiconductor laser elements,
The plurality of reflecting portions are stacked in a direction orthogonal to the arrangement direction of the semiconductor laser elements, and the light incident on each of the plurality of reflecting portions is approximately the light beam of the laser light reflected by the incident surface. They are arranged in the same direction.

2) In order to achieve the above object, in the illumination device according to claim 2, a plurality of first semiconductor laser elements are arranged in a line so that the first laser light having the first wavelength is emitted in the same direction. A plurality of first laser array light sources;
Predetermined with respect to the longitudinal direction of the respective light beams of the first laser beams emitted from the first semiconductor laser elements arranged in a row and corresponding to the plurality of first laser array light sources A plurality of first reflecting portions that reflect the first laser light incident on the incident surface of the first laser light;
A plurality of second laser array light sources in which a plurality of semiconductor laser elements are arranged in a line so that the second laser light of the second wavelength is emitted in the same direction;
The second laser array light sources are arranged so as to correspond to the plurality of second laser array light sources and are predetermined with respect to the longitudinal direction of the respective light beams of the second laser beams emitted from the second semiconductor laser elements arranged in a row. A plurality of second reflecting portions that reflect the second laser light that is incident on the incident surface of the second laser light;
A plurality of third laser array light sources in which a plurality of semiconductor laser elements are arranged in a line so that the third laser light of the third wavelength is emitted in the same direction;
Predetermined with respect to the longitudinal direction of each of the third laser beams emitted from the third semiconductor laser elements arranged in a row and corresponding to the plurality of third laser array light sources A plurality of third reflecting portions that are provided so as to be inclined at an angle, and that reflect the third laser light on which the incident surface of the third laser light is incident,
With
The first to third laser array light sources are arranged in a direction orthogonal to the direction of arrangement of the first to third semiconductor laser elements,
Each of the reflecting portions is stacked in a direction orthogonal to the arrangement direction of the semiconductor laser elements, and the light incident on each of the reflecting portions is approximately the light flux of each laser beam reflected by the incident surface. The first reflection unit, the second reflection unit, and the third reflection unit are arranged in the same direction, and are located at different positions with respect to the reflection directions of the laser beams in the reflection units. Is arranged.

3) In order to achieve the above object, the illumination device according to claim 3 is the illumination device according to claim 2, wherein the second reflecting portion is a first laser beam having the first wavelength. And the third reflecting portion transmits the first laser beam having the first wavelength and the second laser beam having the second wavelength,
The second reflection unit is disposed on the optical axis of the first laser beam reflected by the first reflection unit, and the first laser beam and the second laser beam reflected by the first reflection unit The third reflection unit is disposed on the optical axis of the second laser beam reflected by the reflection unit.

4) In order to achieve the above object, a projection type video display device according to claim 4 is the illumination device according to any one of claims 1 to 3,
The incident surfaces of the plurality of reflecting portions are orthogonal to each other.

5) In order to achieve the above object, a projection display apparatus according to claim 5 includes: the illumination device according to any one of claims 1 to 4;
Beam intensity uniformizing means for uniformizing and emitting the light intensity distribution of the laser light emitted from the illumination device;
A light modulation element that, when the laser light emitted from the beam intensity uniformizing unit is incident, modulates the incident laser light and emits it as video light; and
A projection lens that projects image light emitted from the light modulation element;
Is provided.

6) In order to achieve the above object, the projection display apparatus according to claim 6 emits the combined light of the first laser light, the second laser light, and the third laser light. The lighting device according to claim 2 or claim 3,
Beam intensity uniformizing means for uniformizing and emitting the light intensity distribution of the combined light emitted from the illumination device;
Color light separating means for separating the combined light emitted from the beam intensity uniformizing means into R light, G light, and B light, respectively, and
When the R light, the G light, and the B light emitted from the color light separating unit are incident, the R light, the G light, and the B light that are incident on the R light are modulated, respectively. , An optical modulation element for R light, an optical modulation element for G light, and an optical modulation element for B light, which are emitted as video light of G light and video light of B light,
A composite image obtained by combining the R light image light, the G light image light, and the B light light emitted from the R light modulation element, the G light modulation element, and the B light modulation element. Image light synthesizing means for emitting light,
A projection lens for projecting the combined image light combined by the image light combining means;
Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, illumination efficiency is favorable using a some semiconductor laser element, and it can irradiate illumination light with no illumination intensity unevenness with respect to a light modulation element.

It is the perspective view which showed the laser array light source used for the illuminating device of Example 1 which concerns on this invention. (A), (b) is the perspective view which showed typically the 1st, 2nd example in the illuminating device of Example 1 which concerns on this invention. It is the perspective view which showed typically the 3rd example in the illuminating device of Example 1 which concerns on this invention. (A), (b) is the perspective view which showed typically the illuminating device of the modifications 1 and 2 which deform | transformed partially the 1st, 2nd example in the illuminating device of Example 1 which concerns on this invention. It is the perspective view which showed typically the illuminating device of the modification 3 which deform | transformed partially the 3rd example in the illuminating device of Example 1 which concerns on this invention. It is the block diagram which showed the 1st example in the projection type video display apparatus of Example 2 which concerns on this invention. It is the block diagram which showed the 2nd example in the projection type video display apparatus of Example 2 which concerns on this invention. It is the block diagram which showed the 3rd example in the projection type video display apparatus of Example 2 which concerns on this invention. (A), (b) is the top view and side view which showed the conventional illumination optical apparatus. In the conventional illumination optical apparatus, it is the perspective view which showed the state from which light scattering arises in the X-shaped intersection part of a dichroic mirror.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an illumination device according to the present invention and a projection type image display device using the illumination device will be described below with reference to FIGS. 1 to 8. It demonstrates in detail in order of an apparatus.

  Before describing the illumination apparatus according to the first embodiment of the present invention, a laser array light source used in the illumination apparatus will be described with reference to FIG.

  As shown in FIG. 1, in the laser array light source 11 used in the illumination apparatus according to the first embodiment of the present invention, a plurality of semiconductor lasers having an emission portion 11b1 that emits the laser light L in the direction of the arrow on the substrate 11a. The elements 11b are arranged in a line along the column direction that is one direction. Accordingly, the laser light L emitted from the laser array light source 11 is directed in the arrow direction in FIG. 1 with the column direction as the longitudinal direction.

  A heat sink 11c having a plurality of fins is bonded onto the plurality of semiconductor laser elements 11b in order to dissipate the heat generated in each semiconductor laser element 11b.

  At this time, the plurality of semiconductor laser elements 11b emit laser light L having a substantially single wavelength, and laser light Lr having a wavelength corresponding to the R (red) light is emitted as the laser light L having a substantially single wavelength. A laser light source 11R for R light, a laser light source Lg for emitting a laser light Lg having a wavelength corresponding to G (green) light, and a laser light Lb for a light source corresponding to a laser array light source 11G for G light, B (blue) light. A light source that emits light will be referred to as a laser array light source 11B for B light and will be described below.

  Next, the illuminating device of Example 1 which concerns on this invention is demonstrated using FIGS.

  As shown in FIGS. 2A and 2B, in the illumination devices 10A and 10B of the first and second examples in the first embodiment, one color of laser light L (Lr, Lg, and Lb) having a substantially single wavelength is used. A plurality of laser array light sources 11 (one of 11R, 11G, and 11B) having a plurality of semiconductor laser elements 11b emitting a laser beam) along a column direction that is one direction, and a plurality of lasers The array light source 11 is horizontally installed along the column direction of the semiconductor laser elements 11b.

  Further, a plurality of rectangular mirror portions {12a, 12b ... first example of FIG. 2 (a)} or {12a-12d ... second example of FIG. 2 (b) corresponding to the number of laser array light sources 11 } And a plurality of rectangular mirror parts (12a, 12b) or (12a to 12m) provided on the dichroic mirror 12DM (or total reflection mirror 12M). 12d) are installed in a state where they are alternately stacked vertically orthogonal to each other along the row direction perpendicular to the column direction of the laser array light source 11.

  At this time, when the dichroic mirror 12DM is used, the dichroic mirror 12DM is formed with a dichroic film having wavelength selectivity, and the laser light L (Lr) emitted from the laser array light source 11 (11R, 11G, 11B). , Lg, Lb) has a function of reflecting light of colors corresponding to Lg, Lb) and transmitting light of other colors. The dichroic mirror 12DM color-synthesizes the R light Lr, G light Lg, and B light Lb respectively emitted from the laser array light sources 11R, 11G, and 11B for R light, G light, and B light, as will be described later. It is used for.

  When the total reflection mirror 12M is used, the total reflection mirror 12M reflects all the color lights of the laser light L (Lr, Lg, Lb) emitted from the laser array light source 11 (11R, 11G, 11B). It has a function to make it. In particular, as will be described later, when the R light Lr, G light Lg, and B light Lb emitted from the laser array light sources 11R, 11G, and 11B for R light, G light, and B light are combined, the first color is used. Or when the R light Lr, G light Lg, and B light Lb are individually applied to the three-plate R light, G light, and B light light modulation elements, respectively. By using it, the cost can be reduced as compared with the case of using the dichroic mirror 12DM.

  Each laser array light source 11 is made to face each other in the row direction with the dichroic mirror 12DM (or total reflection mirror 12M) sandwiched between the laser array light sources 11 and alternately opposed to each other. After the light L (Lr, Lg, Lb) is incident on the corresponding rectangular mirrors (12a, 12b) or (12a to 12d), each laser light L is reflected in the same direction to the light modulation element described later. Is getting the illumination light.

  At this time, the column directions of the plurality of laser array light sources 11 in the illumination devices 10A and 10B of the first and second examples in Embodiment 1 correspond to the column directions of pixels arranged in a matrix in the light modulation elements described later. In addition, the row direction in which a plurality of rectangular mirror portions (12a, 12b) or (12a to 12d) of the dichroic mirror 12DM (or total reflection mirror 12M) are orthogonally stacked is arranged in a matrix in the light modulation element. This corresponds to the row direction of the selected pixel.

  Here, as described above with reference to FIG. 1, the plurality of laser array light sources 11 has the plurality of semiconductor laser elements 11 b sandwiched between the substrate 11 a and the heat sink 11 c. When the directions of the laser beams L emitted from the laser beams are directed in the same direction, they approach each other in the row direction (vertical direction) even if the height of each laser array light source 11 is different due to the presence of the substrate 11a and the heat sink 11c. Can not be installed. Therefore, in the illumination devices 10A and 10B of the first and second examples in the first embodiment, the positions of the plurality of laser array light sources 11 are changed in the row direction with the dichroic mirror 12DM (or the total reflection mirror 12M) interposed therebetween. A plurality of laser array light sources 11 can be installed close to each other in the row direction by being alternately arranged and facing each other. Therefore, the laser array light source 11 can efficiently dissipate heat, has a long life, can be turned on instantaneously, and can obtain bright illumination light with good illumination efficiency.

  Specifically, the illumination device 10A of the first example shown in FIG. 2A is a case where the column directions of the two laser array light sources 11 are installed horizontally.

  In this case, the dichroic mirror 12DM (or the total reflection mirror 12M) has two rectangular mirror portions 12a and 12b corresponding to the two laser array light sources 11, and each of the rectangular mirror portions 12a and 12b. The length in the longitudinal direction is slightly longer than the length in the column direction of the plurality of semiconductor laser elements 11b provided in the laser array light source 11, and the lengths in the short direction of the rectangular mirror portions 12a and 12b have the same dimensions. Is formed.

  Further, the dichroic mirror 12DM (or the total reflection mirror 12M) has two rectangular mirrors that are orthogonal to each other in the X shape at the central portion in the longitudinal direction of the two rectangular mirror portions 12a and 12b and at the X-shaped orthogonal portion 12x. The portions 12a and 12b are stacked vertically along the row direction.

  The laser light L emitted from one laser array light source 11 is in a rectangular shape of one of the dichroic mirrors 12DM (or the total reflection mirror 12M) disposed at 45 ° with respect to the optical axis of the laser light L. The laser light L incident on the mirror portion 12a and emitted from the other laser array light source 11 is dichroic mirror 12DM (or a total reflection mirror) disposed at an inclination of 45 ° with respect to the optical axis of the laser light L. 12M) is incident on the other rectangular mirror portion 12b (perpendicular to the rectangular mirror portion 12a) and is reflected in the same direction by the two rectangular mirror portions 12a and 12b. The laser light L reflected by the rectangular mirror portions 12a and 12b has a large irradiation area of the laser light in the row direction and becomes bright illumination light.

  Further, since the dichroic mirror 12DM (or the total reflection mirror 12M) does not have the X-shaped intersection portion 103x as described in the conventional example, no scattering occurs, and the two rectangular mirror portions 12a and 12b respectively Since the two opposed laser array light sources 11 can be approached even if their positions are different in the row direction, the illumination light has no illuminance unevenness at the upper and lower boundaries.

  Moreover, the illumination device 10B of the second example shown in FIG. 2B is a case where the four laser array light sources 11 are alternately installed in the row direction.

  In this case, the dichroic mirror 12DM (or the total reflection mirror 12M) has four rectangular mirror portions 12a to 12d corresponding to the four laser array light sources 11, and the four rectangular mirror portions 12a to 12d. In the X-shaped orthogonal portions 12x, four rectangular mirror portions 12a to 12d are vertically stacked along the row direction.

  Then, each laser beam L emitted from the four laser array light sources 11 has four dichroic mirrors 12DM (or total reflection mirrors 12M) disposed at 45 ° with respect to the optical axis of each laser beam L. After entering the rectangular mirror portions 12a to 12d, the light is reflected in the same direction by the four rectangular mirror portions 12a to 12d. The laser light L reflected by the four rectangular mirror portions 12a to 12d has a wider irradiation area of the laser light in the row direction, becomes brighter illumination light, and faces the four rectangular mirror portions 12a to 12d. The laser light sources 11 can be brought close to each other by changing the positions of the laser array light sources 11 in the row direction.

  Next, as shown in FIG. 3, the illumination device 10 </ b> C of the third example in the first embodiment uses two R laser array light sources 11 </ b> R using the technical idea of FIG. 2A described above. , Two laser array light sources 11G for G light and two laser array light sources 11B for B light are used. Each of the two laser array light sources 11R, 11G, and 11B for R light, G light, and B light is changed to a dichroic mirror by changing the height of each color laser array light source 11 in the row direction as shown in FIG. 12DM (or total reflection mirror 12M) is placed between them to face each other. The laser array light sources 11R, 11G, and 11B of the respective colors that face each other across the dichroic mirror 12DM (or the total reflection mirror 12M) are installed horizontally with respect to the column direction. Thus, the R light Lr, G light Lg, and B light Lb emitted from the laser array light sources 11R, 11G, and 11B for R light, G light, and B light are used for a total of three R light, G light, B Color synthesis is performed by optical dichroic mirrors 12DM-R, 12DM-G, and 12DM-B. The present invention is not limited to this, and as shown in FIG. 2B, four R, G, and B laser array light sources 11R, 11G, and 11B are installed for each of R, G, and B, as shown in FIG. Is substantially the same.

  That is, in the illuminating device 10C shown in FIG. 3, when the first color light is B light Lb, two B light laser array light sources 11B are opposed to the B light dichroic mirror 12DM-B that reflects the B light Lb. When the second color light is G light Lg, the two G light laser array light sources 11G are opposed to the G light dichroic mirror 12DM-G that reflects the G light Lg and transmits the B light Lb. When the color light of the color is R light Lr, two R light laser array light sources 11R are opposed to R light dichroic mirror 12DM-R that reflects R light Lr and transmits B light Lb and G light Lg. Yes.

  Note that the B light dichroic mirror 12DM-B facing the first color B light laser array light source 11B only needs to reflect the B light Lb, and therefore is replaced with the B light dichroic mirror 12DM-B. The total reflection mirror 12M may be used. In this case, the total reflection mirror 12M can be obtained at a lower cost than the dichroic mirror 12DM-B for B light, and thus the illumination device 10C can be provided at a low cost.

  At this time, a total of three dichroic mirrors 12DM-R, 12DM-G, and 12DM-B for R light, G light, and B light are provided with the same two as described above with reference to FIG. The central portions in the longitudinal direction of the rectangular mirror portions 12a and 12b are alternately stacked in an X shape and stacked vertically along the row direction.

  Specifically, a total of three dichroic mirrors for R light, G light, and B light, 12DM-R, 12DM-G, and 12DM-B are arranged at intervals in the column direction, and for R light and G light. , B light dichroic mirrors 12DM-R, 12DM-G, and 12DM-B are arranged so that the X-shaped orthogonal portions 12x are positioned on the axis K. Further, the upper mirrors 12a of the R light, G light, and B light dichroic mirrors 12DM-R, 12DM-G, and 12DM-B are parallel to each other, and the lower mirrors 12b are parallel to each other. A total of three dichroic mirrors 12DM-R, 12DM-G, and 12DM-B for R light, G light, and B light are installed, and two laser array light sources 11R for R light, G light, and B light, respectively. 11G and 11B are alternately placed opposite to each other at different positions in the row direction across the dichroic mirrors 12DM-R, 12DM-G, and 12DM-B for R light, G light, and B light, respectively. .

  Accordingly, each B light Lb emitted from the two B light laser array light sources 11B is reflected by the B light dichroic mirror 12DM-B (or the total reflection mirror 12M) and then the G light dichroic mirror 12DM-G and R. The G light Lg emitted through the light dichroic mirror 12DM-R and emitted from the two laser array light sources 11G for G light is reflected by the dichroic mirror 12DM-G for G light, and then the dichroic mirror for R light. Since each R light Lr emitted through the 12DM-R and emitted from the two laser array light sources 11R for R light is reflected by the dichroic mirror 12DM-R for R light and then emitted as it is, the R light Lr , G light Lg, and B light Lb are combined into white light Lrgb. It has the illumination light.

  Next, only the differences between the lighting device of the first embodiment and the lighting device of the first embodiment will be described with reference to FIGS. 4A, 4 </ b> B, and 5. explain.

  As shown in FIGS. 4A and 4B, in the illumination devices 10A ′ and 10B ′ of the first and second modifications, a plurality of laser array light sources 11 (one of 11R, 11G, and 11B) are arranged in the column direction. The arranged semiconductor laser elements 11b are arranged so as to be in the column direction of FIG. That is, the installation direction of the laser array light source 11 is changed by 90 ° with respect to the first embodiment.

  Accordingly, a dichroic mirror 12DM (or total reflection) having a plurality of rectangular mirror portions (12a, 12b ... first example) or (12a-12d ... second example) corresponding to the number of laser array light sources 11 is included. A mirror 12M) is prepared. The plurality of rectangular mirror portions (12a to 12b or 12a to 12d) provided in the dichroic mirror 12DM (or the total reflection mirror 12M) are arranged in a row direction orthogonal to the arrangement direction of the semiconductor laser elements 11b of the laser array light source 11. The central portions are alternately stacked in an X-shape orthogonally.

  Then, the plurality of laser array light sources 11 are opposed to each other by alternately changing the positions in the row direction with the dichroic mirror 12DM (or the total reflection mirror 12M) interposed therebetween. Each laser beam L (Lr, Lg, Lb) emitted from each laser array light source 11 is reflected in the same direction after entering the corresponding rectangular mirror (12a, 12b) or (12a-12d). I get the illumination light.

  The illumination device 10A ′ of the first modification shown in FIG. 4A corresponds to the case where the column directions of the two laser array light sources 11 are installed vertically, while the second modification shown in FIG. 4B. The illumination device 10B corresponds to the case where the column directions of the four laser array light sources 11 are installed vertically. Therefore, first, FIG. The substantially same effect as the illumination devices 10A and 10B of the first and second examples described using (b) can be obtained.

  Further, the illumination device 10C ′ of the modified example 3 shown in FIG. 5 uses the technical idea shown in FIG. 4A to provide two R light laser array light sources 11R and two G light laser arrays. A light source 11G and two laser array light sources 11B for B light are used. The two laser array light sources 11R, 11G, and 11B for R light, G light, and B light are respectively changed in the row direction as shown in FIG. 4A, and the dichroic mirror 12DM is changed. (Or the total reflection mirror 12M). The laser array light sources 11R, 11G, and 11B of the respective colors that face each other across the dichroic mirror 12DM (or the total reflection mirror 12M) are installed perpendicular to the column direction. Thus, the R light Lr, G light Lg, and B light Lb emitted from the laser array light sources 11R, 11G, and 11B for R light, G light, and B light are used for a total of three R light, G light, B Color synthesis is performed by optical dichroic mirrors 12DM-R, 12DM-G, and 12DM-B. The present invention is not limited to this, and as shown in FIG. 4 (b), when four R, G, and B laser array light sources 11R, 11G, and 11B are installed for each of R, G, and B, FIG. Is substantially the same.

  Therefore, the illumination device 10 </ b> C ′ according to the third modification can obtain substantially the same effect as the illumination device 10 </ b> C according to the third example described above with reference to FIG. 3.

  In the illumination device 10C ′ of the third modified example, the B light dichroic mirror 12DM-B facing the first color B light laser array light source 11B only needs to reflect the B light Lb. Therefore, the total reflection mirror 12M may be used instead of the dichroic mirror 12DM-B for B light.

  Next, a projection type video display device using the illumination device shown in Embodiment 1 will be described.

  First, the projection type image display apparatus 20 of the first example in Example 2 shown in FIG. 6 includes the illumination device 10C described with reference to FIG. 3 and the light intensity of the white light Lrgb emitted from the illumination device 10C. It comprises beam intensity equalizing means 21 to 23 for equalizing the beam intensity as a distribution, a single plate type light modulation element 24 using a liquid crystal panel or DMD, and a projection lens 25.

  That is, in the projection-type image display device 20 of the first example, R light Lr emitted from each of the two laser array light sources 11R, 11G, and 11B for R light, G light, and B light, for example, in the illumination device 10C. , G light Lg and B light Lb are combined by a total of three dichroic mirrors 12DM-R, 12DM-G, and 12DM-B for R light, G light, and B light to obtain white light Lrgb. The white light Lrgb is made incident on the light tunnel 22 by the condenser lens 21 and the beam intensity of the white light Lrgb is made uniform in the light tunnel 22, and then the white light Lrgb is modulated by the relay lens 23 in a single plate type. The element 24 is irradiated.

  Thereafter, the image light Lrgbe light-modulated and emitted by the single-plate light modulation element 24 is enlarged and projected on the screen 26 by the projection lens 25, so that a bright image with no color unevenness can be displayed on the screen 26. . Also in the first example, as described above, the total reflection mirror 12M may be used for the B light Lb of the first color instead of the dichroic mirror 12DM-B for B light.

  Next, the projection type image display device 30 of the second example in the second embodiment shown in FIG. 7 includes the illumination device 10C described with reference to FIG. 3 and the beam of white light Lrgb emitted from the illumination device 10C. Beam intensity equalizing means 31 to 33 for equalizing the intensity, color light separating means 34 to 38 for separating the white light Lrgb having the uniform beam intensity into R light Lr, G light Lg, and B light Lb, and a liquid crystal panel 3 plate type optical modulators 39R, 39G, 39B for R light, G light, B light and three plate type optical modulators 39R, 39G for R light, G light, B light using DMD, etc. , 39B emitted from the R, G, and B video lights Lre. It comprises image light combining means (hereinafter referred to as a dichroic prism) 40 for combining Lge and Lbe, and a projection lens 41.

  That is, in the projection display apparatus 30 of the second example, the white light Lrgb emitted from the illuminating device 10C is incident on the light tunnel 22 by the condenser lens 21, and the beam intensity of the white light Lrgb is made uniform in the light tunnel 22. The process is the same as that of the projection-type image display device 20 (FIG. 6) of the first example described above. A different point is after the step of separating the white light Lrgb with uniform beam intensity into the R light Lr, the G light Lg, and the B light Lb by the color light separating means 34 to 38, respectively.

  The color light separating means 34 to 38 are dichroic mirrors that reflect the R light Lr in the white light Lrgb having a uniform beam intensity, change the direction by 90 °, and transmit the G light Lg and the B light Lb and travel straight. 34, the R light Lr reflected by the dichroic mirror 34, re-reflected and changed the direction by 90 °, and then irradiates the R light modulation element 39R, and the G light Lg transmitted through the dichroic mirror 34. The dichroic mirror 36 that reflects the G light Lg of the B light Lb and changes the direction by 90 ° and then irradiates the light modulation element 39G for G light and transmits the B light Lb and travels straight, and the dichroic mirror 36 A dichroic mirror (or total reflection mirror) 37 that reflects the transmitted B light Lb and changes the direction by 90 °, and a dichroic mirror (or total reflection mirror) And a total reflection mirror 38 to irradiate the B Hikari Mitsumochi modulation element 39B after the reflected B light Lb is reflected by 90 ° turning again 7.

  The R light Lr, G light Lg, and B light Lb incident on the light modulating elements 39R, 39G, and 39B for R light, G light, and B light are modulated for R light, G light, and B light. The light is modulated by the elements 39R, 39G, and 39B, emitted as R, G, and B image lights Lre, Lge, and Lbe, respectively, and incident on the rectangular dichroic prism 40.

  In the dichroic prism 40, dichroic films 40r and 40b are formed so as to intersect with each other in an X shape, and the R color image light Lre emitted from the R light modulation element 39R is reflected by the dichroic film 40r. The G-color image light Lge emitted from the G light modulation element 39G passes through the dichroic films 40r and 40b and travels straight and is emitted from the B light modulation element 39B. The B-color image light Lbe is reflected by the dichroic film 40b and turned 90 °, and the R-color image light Lre, the G-color image light Lge, and the B-color image light Lbe are color-combined and projected as color image light. The light enters the lens 41.

  Since the color image light is enlarged and projected on the screen 42 by the projection lens 41, a bright color image with no color unevenness can be displayed on the screen 42.

  Next, the projection type image display device 50 of the third example in the embodiment 2 shown in FIG. 8 is provided with the illumination device 10A described with reference to FIG. 2A for each of R, G, and B. Illumination devices 10A-R, 10A-G, and 10A-B for light, G light, and B light, and R light Lr emitted from the three illumination devices 10A-R, 10A-G, and 10A-B, respectively Three beam intensity equalizing means 51 to 53 for equalizing each beam intensity of the G light Lg and B light Lb for each color light, and a three-plate type for R light, G light using a liquid crystal panel, DMD, etc. R light, G color, and B color image light Lre respectively emitted from the B light modulation elements 54R, 54G, and 54B and the R light, G light, and B light modulation elements 54R, 54G, and 54B, respectively. , Lge, and Lbe for image light combining means (hereinafter referred to as dichroic prism) 5 When, and a projection lens 56.

  At this time, in the projection display apparatus 50 of the third embodiment, it is necessary to provide three beam intensity equalizing means 51 to 53 in the optical paths of the R light, G light, and B light. The cost is higher than that of the projection type image display device 30 (FIG. 7).

  That is, in the projection type image display device 50 of the third example, the R light Lr emitted from the plurality of laser array light sources 11R in the illumination device 10A-R for R light is reflected by the total reflection mirror 12M and is used for G light. G light Lg emitted from the plurality of laser array light sources 11G in the illumination devices 10A-G is reflected by the total reflection mirror 12M and emitted from the plurality of laser array light sources 11B in the illumination devices 10A-B for B light. The B light Lb is reflected by the total reflection mirror 12M.

  In the third example, the total reflection mirror 12M is used in each of the three illumination devices 10A-R, 10A-G, and 10A-B. Instead, the R light shown in FIG. There is no problem even if the dichroic mirrors 12DM-R, 12DM-G, and 12DM-B for G, B light, and B light are used, but the total reflection mirror 12M is less expensive.

  Then, a light tunnel for each color light is provided by a condensing lens 51 provided with R light Lr, G light Lg, and B light Lb emitted from the three lighting devices 10A-R, 10A-G, and 10A-B for each color light. 52 is incident. The light intensity is made uniform for each of the R light Lr, the G light Lg, and the B light Lb in the light tunnel 52 for each color light, and then transmitted through a relay lens 53 provided corresponding to the light tunnel 52. The light modulating elements 54R, 54G, and 54B for R light, G light, and B light are respectively irradiated.

  Thereafter, R-color, G-color, and B-color image lights Lre, Lge, and Lbe emitted after being light-modulated by the three-plate R, G, and B light modulators 54R, 54G, and 54B, respectively. Is color-combined by a dichroic prism 55 formed with dichroic films 55r, 55b intersecting in an X shape inside to form color video light. Since the color image light is enlarged and projected on the screen 57 by the projection lens 56, a bright color image without color unevenness can be displayed on the screen 57.

10 ... Illumination device of Example 1,
10A ... Illumination device of the first example in Example 1,
10A ′... Illumination device of Modification 1 obtained by partially modifying the illumination device of the first example described above,
10B ... Illumination device of the second example in Example 1,
10B ′... Illumination device of Modification 2 obtained by partially modifying the illumination device of the second example described above,
10C: the lighting device of the third example in Example 1,
10C '... Illumination device of Modification 3 in which the illumination device of the third example described above is partially deformed,
DESCRIPTION OF SYMBOLS 11 ... Laser array light source, 11a ... Board | substrate, 11b ... Semiconductor laser element,
11b1 ... emitting part, 11c ... heat sink, 11R ... laser array light source for R light,
11G: Laser array light source for G light, 11B: Laser array light source for B light,
12DM ... Dichroic mirror,
12DM-R ... R light dichroic mirror,
12DM-G ... dichroic mirror for G light,
12DM-B ... B light dichroic mirror,
12M ... Total reflection mirror, 12a to 12d ... Rectangular mirror part, 12x ... X-shaped orthogonal part,
20 ... Projection type image display device of the first example in Example 2,
21 to 23: Beam intensity uniformizing means,
21 ... Condensing lens, 22 ... Light tunnel, 23 ... Relay lens,
24 ... Single plate type light modulation element, 25 ... Projection lens, 26 ... Screen,
30 ... Projection-type image display device of the second example in Example 2,
31-33 ... Beam intensity uniformizing means,
31 ... Condensing lens, 32 ... Light tunnel, 33 ... Relay lens,
34 to 38 ... color light separating means, 34 ... dichroic mirror, 35 ... total reflection mirror,
36 ... Dichroic mirror, 37 ... Dichroic mirror (or total reflection mirror),
38 ... Total reflection mirror,
39R, 39G, 39B ... 3-plate type light modulator for R light, G light, B light,
40. Image light combining means (dichroic prism),
41 ... projection lens, 42 ... screen,
50. Projection-type image display device of the third example in Example 2,
51-53 ... Beam intensity uniformizing means,
51 ... Condensing lens, 52 ... Light tunnel, 53 ... Relay lens,
54R, 54G, 54B ... 3-plate type light modulator for R light, G light, B light,
55. Image light combining means (dichroic prism),
56 ... projection lens, 57 ... screen,
K ... optical axis, L ... laser light, Lr ... R light, Lg ... G light, Lb ... B light, Lrgb ... white light,
Lre ... R color image light, Lge ... G color image light, Lbe ... B color image light,
Lrgbe ... Video light.

Claims (6)

A plurality of laser array light sources in which a plurality of semiconductor laser elements are arranged in a row so that substantially single wavelength laser light is emitted in the same direction;
Arranged to correspond to the plurality of laser array light sources, and provided so as to be inclined at a predetermined angle with respect to the longitudinal direction of each light beam of the laser light emitted from the semiconductor laser elements arranged in the row, A plurality of reflecting portions for reflecting the laser light incident on the laser light incident surface;
With
The plurality of laser array light sources are arranged in a direction orthogonal to the direction of arrangement of the semiconductor laser elements,
The plurality of reflecting portions are stacked in a direction orthogonal to the arrangement direction of the semiconductor laser elements, and the light incident on each of the plurality of reflecting portions is approximately the light beam of the laser light reflected by the incident surface. An illuminating device that is arranged in the same direction. A plurality of first laser array light sources in which a plurality of first semiconductor laser elements are arranged in a line so that the first laser light of the first wavelength is emitted in the same direction;
Predetermined with respect to the longitudinal direction of the respective light beams of the first laser beams emitted from the first semiconductor laser elements arranged in a row and corresponding to the plurality of first laser array light sources A plurality of first reflecting portions that reflect the first laser light incident on the incident surface of the first laser light;
A plurality of second laser array light sources in which a plurality of semiconductor laser elements are arranged in a line so that the second laser light of the second wavelength is emitted in the same direction;
The second laser array light sources are arranged so as to correspond to the plurality of second laser array light sources and are predetermined with respect to the longitudinal direction of the respective light beams of the second laser beams emitted from the second semiconductor laser elements arranged in a row. A plurality of second reflecting portions that reflect the second laser light that is incident on the incident surface of the second laser light;
A plurality of third laser array light sources in which a plurality of semiconductor laser elements are arranged in a line so that the third laser light of the third wavelength is emitted in the same direction;
Predetermined with respect to the longitudinal direction of each of the third laser beams emitted from the third semiconductor laser elements arranged in a row and corresponding to the plurality of third laser array light sources A plurality of third reflecting portions that are provided so as to be inclined at an angle, and that reflect the third laser light on which the incident surface of the third laser light is incident,
With
The first to third laser array light sources are arranged in a direction orthogonal to the direction of arrangement of the first to third semiconductor laser elements,
Each of the reflecting portions is stacked in a direction orthogonal to the arrangement direction of the semiconductor laser elements, and the light incident on each of the reflecting portions is approximately the light flux of each laser beam reflected by the incident surface. The first reflection unit, the second reflection unit, and the third reflection unit are arranged in the same direction, and are located at different positions with respect to the reflection directions of the laser beams in the reflection units. It is arrange | positioned to the illuminating device characterized by the above-mentioned. The second reflecting unit transmits the first laser beam having the first wavelength, and the third reflecting unit is configured to transmit the first laser beam having the first wavelength and the second laser beam having the second wavelength. 2 laser light is transmitted,
The second reflection unit is disposed on the optical axis of the first laser beam reflected by the first reflection unit, and the first laser beam and the second laser beam reflected by the first reflection unit The lighting device according to claim 2, wherein the third reflection unit is disposed on an optical axis of the second laser beam reflected by the reflection unit.   The illumination device according to any one of claims 1 to 3, wherein the incident surfaces of the plurality of reflecting portions are orthogonal to each other. The lighting device according to any one of claims 1 to 4,
Beam intensity uniformizing means for uniformizing and emitting the light intensity distribution of the laser light emitted from the illumination device;
A light modulation element that, when the laser light emitted from the beam intensity uniformizing unit is incident, modulates the incident laser light and emits it as video light; and
A projection lens that projects image light emitted from the light modulation element;
A projection-type image display device comprising: The illuminating device according to claim 2 or 3, wherein a combined light of the first laser light, the second laser light, and the third laser light is emitted.
Beam intensity uniformizing means for uniformizing and emitting the light intensity distribution of the combined light emitted from the illumination device;
Color light separating means for separating the combined light emitted from the beam intensity uniformizing means into R light, G light, and B light, respectively, and
When the R light, the G light, and the B light emitted from the color light separating unit are incident, the R light, the G light, and the B light that are incident on the R light are modulated, respectively. , An optical modulation element for R light, an optical modulation element for G light, and an optical modulation element for B light, which are emitted as video light of G light and video light of B light,
A composite image obtained by combining the R light image light, the G light image light, and the B light light emitted from the R light modulation element, the G light modulation element, and the B light modulation element. Image light synthesizing means for emitting light,
A projection lens for projecting the combined image light combined by the image light combining means;
A projection-type image display device comprising:

Images