JP6682258B2 - Light source device and projection device including the same - Google Patents

Description

The present invention emits a plurality of light beams each having a peak at a wavelength different from each other from a plurality of light source units, superimposes the plurality of light beams by a light combining unit including an optical element, and combines the combined light beams. It relates to a light source device and projection equipment provided therewith emits.

  As a light source device, a plurality of light beams having peaks at mutually different wavelengths are emitted from a plurality of light source units such as a laser light source unit, and the plurality of light beams are superposed by a light combining unit including an optical element such as a dichroic mirror. A light source device that emits a combined light beam that has been superimposed is conventionally known (see, for example, Patent Document 1). For example, a plurality of brightness-modulated light beams are superimposed and scanned on a projection target such as a screen. The present invention can be applied to an optical scanning type projection device (projector).

JP, 2010-8545, A

  In such a conventional light source device, it is required to improve the brightness of emitted light, but there is a limit to increase the light intensity (luminance) of the light source unit itself, and the light combining unit and the aperture member are limited. To improve the light utilization efficiency by reducing the light amount loss (eg, angle error, light reflectance, position error, light amount loss due to light transmittance, etc.) in optical systems such as (especially optical elements such as dichroic mirrors) The issue is how to do it. This will be specifically described below with reference to FIGS. 10 to 12.

  FIG. 10 is a schematic configuration diagram showing a general configuration in which a plurality of light beams Lr, Lg, and Lb having peaks at wavelengths different from each other in the light source device 10X in the conventional projection device 100X are overlapped via the light combining unit 120X. Is.

  The light source device 10X illustrated in FIG. 10 includes a plurality of light source units 10r, 10g, and 10b (three laser beams in this example) that emit a plurality of light beams Lr, Lg, and Lb having peaks at different wavelengths, respectively. In this example, three laser light source units) and a light combining unit 120X (a dichroic mirror in this example) for overlapping the plurality of light beams Lr, Lg, Lb are provided, and the light combining unit 120X allows the plurality of light beams Lr, Lg. , Lb are superimposed to emit a combined light beam Lmix.

  In the example illustrated in FIG. 10, the plurality of light beams include a red light beam Lr having a peak at a red (R) wavelength, a green light beam Lg having a peak at a green (G) wavelength, and a blue ( There are three light beams including the blue light beam Lb having a peak at the wavelength of B).

  The optical elements forming the light combining section 120X reflect the first dichroic mirror 121X that reflects light in the blue wavelength range and the light in the green wavelength range, while light in other wavelength ranges (in this example, A second dichroic mirror 122X that transmits light of a blue wavelength) and a second dichroic mirror 122X that transmits light of a red wavelength range while reflecting light of other wavelength ranges (lights of blue and green wavelengths in this example). It is a three dichroic mirror 123X.

  The light source device 10X is configured to reflect the blue light beam Lb traveling in a predetermined traveling direction by the first dichroic mirror 121X.

  In addition, the light source device 10X transmits the blue light beam Lb from the first dichroic mirror 121X by the second dichroic mirror 122X, while converting the green light beam Lg traveling in a predetermined traveling direction into a blue light beam Lb. It is designed to reflect so that they overlap.

  Further, the light source device 10X transmits the red light beam Lr traveling in the predetermined traveling direction by the third dichroic mirror 123X, while transmitting the green light beam Lg and the blue light beam Lb from the second dichroic mirror 122X. The red light beam Lr is reflected so as to overlap it.

  Thus, the first dichroic mirror 121X, the second dichroic mirror 122X, and the third dichroic mirror 123X superimpose the plurality of light beams Lr, Lg, Lb emitted from the plurality of light source units 10r, 10g, 10b, respectively, to form a combined light beam. The beam is Lmix.

  Further, the light source device 10X shapes the combined light beam Lmix, which is emitted from the light source units 10r, 10g, and 10b and overlapped by the light combining unit 120X (in this example, a dichroic mirror), into a beam diameter of a predetermined size by the aperture member 13. Then, the shaped combined light beam Lmix is reflected by the reflection mirror section 14.

  The projection apparatus 100X including the light source device 10X emits a plurality of light beams Lr, Lg, Lb emitted from the light source units 10r, 10g, 10b in the light source device 10X based on an image signal from an external device (not shown). Luminance modulation is performed, and the combined light beam Lmix is overlapped by the light combining unit 120X, the combined light beam Lmix is emitted toward the scanning device 20, and the combined light beam Lmix scanned by the scanning device 20 is corrected on the projection target SC such as a screen. Project through the lens 30. Then, the projection device 100X causes a person to visually recognize an image displayed on the projection target SC by the light reflected by the projection target SC or the light transmitted through the projection target SC.

  By the way, in the light source device 10X shown in FIG. 10, a light amount loss (for example, an angular error, etc.) in an optical system (especially an optical element such as a dichroic mirror) such as the light combining section 120X (specifically, a dichroic mirror) and the aperture member 13 is provided. The light utilization efficiency decreases due to the light reflectance, the position error, the light amount loss due to the light transmittance, and the like.

  FIG. 11 shows an angular error and a positional error in the first dichroic mirror 121X, the second dichroic mirror 122X, and the third dichroic mirror 123X on which the plurality of light beams Lr, Lg, Lb are incident in the light source device 10X shown in FIG. FIG. 6 is a schematic side view schematically showing a combined light beam Lmix which passes through an opening 13a in the aperture member 13 in the case where there is little or no such error. FIG. 11A shows the overall configuration, and FIG. 11B shows the opening 13a portion of the aperture member 13 in an enlarged manner.

  FIG. 12 shows an angular error and a positional error in the first dichroic mirror 121X, the second dichroic mirror 122X, and the third dichroic mirror 123X on which the plurality of light beams Lr, Lg, Lb are incident in the light source device 10X shown in FIG. 7 is a schematic side view schematically showing a combined light beam Lmix passing through an opening 13a in the aperture member 13 in the case where there is an error such as. FIG. 12A shows the entire structure, and FIG. 12B shows the opening 13a portion of the aperture member 13 in an enlarged manner.

  11 and 12, the graphs αr, αg, and αb show the power distributions of the red, green, and blue light beams Lr, Lg, and Lb that have passed through the opening 13a in the aperture member 13, respectively.

  In shaping the combined light beam Lmix in which the plurality of light beams Lr, Lg, and Lb are superposed at the opening 13a in the aperture member 13 into a beam diameter of a predetermined size, the optical axes of the plurality of light beams Lr, Lg, and Lb are By locating the center at the center or substantially the center of the opening 13a in the aperture member 13 (see FIG. 11), the loss of the light quantity can be reduced to the maximum or substantially the maximum, and the light utilization efficiency can be improved accordingly. However, it is difficult to avoid an error such as an angle error or a position error of an optical element (specifically, a dichroic mirror) on which the light beams Lr, Lg, and Lb are incident. Therefore, usually, the centers of the optical axes of the plurality of light beams Lr, Lg, and Lb are often not located at the center or substantially the center of the opening 13a in the aperture member 13 (see FIG. 12). Lr, Lg, and Lb are blocked by the opening 13a, so that the amount of the light beam passing through the opening 13a is reduced, and the loss of the light amount is increased accordingly, thereby reducing the light utilization efficiency.

  That is, in the conventional light source device 10X, the larger the number of optical elements forming the light combining unit 120X, the larger the error such as the angle error and the position error, and the larger the light amount loss, and the lower the light use efficiency. Invite.

  However, in a configuration in which the number of optical elements (specifically, color synthesizing mirrors) forming the light synthesizing unit is equal to the number of a plurality of light source units as in the configuration described in Patent Document 1, the light amount loss should be taken into consideration. However, the light utilization efficiency is reduced accordingly.

Therefore, the present invention can reduce the light amount loss (for example, the light amount loss due to the angle error, the light reflectance, the position error, the light transmittance, etc.) as compared with the conventional configuration, thereby improving the light utilization efficiency. and to provide a projection equipment with a light source device and it can.

The present invention, in order to solve the above problems, provides the following light source device and projection equipment.
(1) Light Source Device A light source device according to the present invention includes a plurality of light source units that respectively emit a plurality of light beams having peaks at different wavelengths, and a light combining unit that includes an optical element that superimposes the plurality of light beams. A light source device that emits a combined light beam in which the plurality of light beams are overlapped, wherein the number of the optical elements forming the light combining unit is smaller than the number of the plurality of light source units. And a plurality of groups of light sources including the plurality of light sources and the light combining section, and a combining element that combines a plurality of the combined light beams emitted from the plurality of groups of light sources. The plurality of light source groups are two light source groups, and in each of the two light source groups, the plurality of light source units emit the plurality of light beams, and the light combining unit includes ,Before The first dichroic mirror that transmits one light beam of the plurality of light beams while reflecting the other light beam, and the first dichroic mirror that transmits another light beam of the first dichroic mirror. And a second dichroic mirror that reflects the other light beam, and the combined light beam emitted from one of the two light source groups is a P-polarized component and an S-polarized component. Of the P-polarized light component and the S-polarized light component, the combined light beam emitted from the other light source group has the other polarized light component. Is a polarization beam splitter which transmits one of the polarization components emitted from the one light source group and reflects the other polarization component emitted from the other light source group. And wherein the door.
(2) Projection Device The projection device according to the present invention is characterized by including the light source device according to the present invention .

In the present invention, among the plurality of light beams, smaller than the number of the optical elements smallest light beam number spectral luminous efficiency of the optical element is incident to spectral luminous efficiency is the most size have light beams incident A mode configured as described above can be exemplified.

In the present invention, the plurality of the light beam, the number of the optical element for reflecting the spectral luminous efficiency is the largest light beam relative luminosity maximum light beam, the optical element you reflecting other light beam It is possible to exemplify a mode in which the number is smaller than the number.

In the present invention, can be exemplified embodiments relative luminous efficiency of the plurality of light beams are configured with a reduced number of optical elements you reflecting the light beam and according to large.

  In the present invention, an aspect in which the light combining unit includes the optical element that transmits a light beam having a higher relative luminous efficiency among the incident light beams and reflects a light beam having a lower relative luminous efficiency. Can be illustrated.

In the present invention, in each of the light source groups, the number of the optical elements on which the relative luminous efficiency maximum light beam, which is the light beam having the largest relative luminous efficiency among the plurality of light beams, is incident is set to one. The aspect which is set as the structure can be illustrated.

  In the present invention, the light source unit includes a plurality of light sources that respectively emit the plurality of light beams, and a plurality of collimator lenses that respectively enter the light beams from the plurality of light sources, and the plurality of light sources, In each case, it is possible to exemplify a mode in which a light emitting element and a package that houses the light emitting element are provided, and the collimator lens is arranged so as to be close to the package in the light source so as not to contact the package.

In the present invention, the plurality of light source units, a red light source unit for emitting a red light beam having a peak at a red wavelength, and a green light source unit for emitting a green light beam having a peak at a green wavelength. , and a blue light source unit that emits blue light beam having a peak in the blue wavelength, the first dichroic mirror over, while transmitting the red light beam from the red light source portion, the blue reflects the blue light beam from the use light source unit, the second dichroic mirror, while transmitting the green light beam from the green light source unit, the red light beam from the first dichroic mirror and It can be exemplified state like you reflects the blue light beam.

In projecting the shadow device engaging Ru in the present invention, the light source device wherein the synthetic light beam incident to the first scan while scanning at a predetermined first scan angle determined in advance in a predetermined first predetermined scanning direction from A scanning device having a scanning mirror that scans at a second scanning angle that is smaller than the first scanning angle in a second scanning direction that is orthogonal or substantially orthogonal to the direction, and combines the combined light with the scanning mirror in the scanning device. A mode in which the beam is incident from the second scanning direction can be exemplified.

  According to the present invention, the light amount loss (for example, the light amount loss due to the angle error, the light reflectance, the position error, the light transmittance, and the like) can be reduced as compared with the conventional configuration, and thus the light utilization efficiency can be improved. It will be possible.

FIG. 1 is a schematic configuration diagram schematically showing a schematic configuration of a projection device including a light source device according to an embodiment of the present invention. FIG. 4A is a schematic cross-sectional view for explaining that the light utilization efficiency of a light beam decreases as the focal length of a collimator lens increases, and FIG. It is a figure which shows the state which the beam is injecting into the aperture in an aperture member, and (b) shows the state which the synthetic | combination light beam in the case where the focal distance of a collimator lens is comparatively short injects into the aperture in an aperture member. FIG. 3 is a schematic cross-sectional view schematically showing a state in which the centers of the optical axes of a plurality of light beams forming the combined light beam are adjusted with the aperture member as a reference. 3 is a schematic cross-sectional view schematically showing a state in which the centers of the optical axes of a plurality of light beams forming the combined light beam are adjusted with reference to the projection target. It is a schematic block diagram which shows typically the schematic structure of the projection apparatus provided with the light source device provided with a plurality of light source groups and a synthetic | combination element. It is a schematic perspective view which shows that the aspect ratio of the image projected on a to-be-projected body from a projection apparatus becomes a long ratio long in a horizontal direction. 3A is a schematic cross-sectional view schematically showing a state in which a combined light beam is made incident on a scanning mirror in a scanning device from a first scanning direction, and FIG. 7A is a combined light incident on the scanning mirror in a first scanning direction. It is a figure which shows the beam diameter of a beam, and (b) is a figure which shows the incident angle and the 1st scanning angle with respect to the scanning mirror of a synthetic | combination light beam. 3A is a schematic cross-sectional view schematically showing a state in which a combined light beam is made incident on a scanning mirror in a scanning device from a second scanning direction, and FIG. 6A is a combined light incident on the scanning mirror in a second scanning direction. It is a figure which shows the beam diameter of a beam, and (b) is a figure which shows the incident angle with respect to the scanning mirror of a synthetic | combination light beam, and a 2nd scanning angle. It is a graph showing the relative luminous efficiency with respect to the wavelength of light. It is a schematic block diagram which shows the general structure which overlaps the some light beam which has a peak in a mutually different wavelength in the light source device in the conventional projection apparatus via a photosynthesis part. In the light source device shown in FIG. 10, an aperture member when the first dichroic mirror, the second dichroic mirror, and the third dichroic mirror on which a plurality of light beams are incident have no or almost no error such as an angular error or a positional error. 2A is a schematic side view schematically showing a combined light beam passing through the aperture in FIG. 2A, FIG. 2A is a diagram showing the overall configuration, and FIG. 2B is an enlarged view showing an aperture portion in an aperture member. Is. In the light source device shown in FIG. 10, the opening in the aperture member when the first dichroic mirror, the second dichroic mirror, and the third dichroic mirror on which a plurality of light beams are incident has an error such as an angular error or a positional error It is a schematic side view which shows the synthetic | combination light beam which passes typically, (a) is a figure which shows the whole structure, (b) is a figure which expands and shows the opening part in an aperture member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Projector]
FIG. 1 is a schematic configuration diagram schematically showing a schematic configuration of a projection device 100 including a light source device 10 according to an embodiment of the present invention.

  The projection device 100 shown in FIG. 1 is a light scanning type projection device (projector), and includes a light source device 10, a scanning device 20 (MEMS in this example), and a correction lens 30.

  The light source device 10 emits a plurality (2 or 3 or more) of light beams Lg, Lr, Lb (three laser beams in this example) having peaks at wavelengths different from each other. ) Light source units 10g, 10r, 10b (three laser light source units in this example) and a light combining unit 120 including an optical element (a dichroic mirror in this example) for superposing a plurality of light beams Lg, Lr, Lb. It is configured to emit a combined light beam Lmix in which a plurality of light beams Lg, Lr, and Lb are superposed. That is, the optical system 10 a in the light source device 10 includes the light combining unit 120.

  In the example shown in FIG. 1, a plurality of light beams are divided into a green light beam Lg having a peak at a green (G) wavelength (530 nm in this example) and a red (R) wavelength (640 nm in this example). The red light beam Lr having a peak and the blue light beam Lb having a peak at the wavelength of blue (B) (450 nm in this example) are three light beams. That is, the three light source units 10g, 10r, and 10b respectively emit the green light beam Lg, the red light beam Lr, and the blue light beam Lb according to the video signal input from the external device 200. As the plurality of light source units 10g, 10r, 10b, conventionally known light source units can be used, and detailed description thereof will be omitted here.

  The scanning device 20 is a mirror driving device including a scanning mirror 21 and an actuator 22 such as a piezoelectric element that swings the scanning mirror 21. The projection device 100 emits the combined light beam Lmix from the light source device 10 toward the scanning mirror 21 in the scanning device 20.

  In this example, the scanning device 20 is a MEMS (Micro Electro Mechanical Systems). A conventionally known scanning device can be used as the scanning device 20, and a detailed description thereof will be omitted here.

  In the light source device 10, the number of optical elements (dichroic mirrors in this example) forming the light combining section 120 is smaller than the number of light source sections 10g, 10r, 10b (three in this example) (this example). Then, the number is two).

  Specifically, the optical element that constitutes the light combining unit 120 is a first dichroic mirror 121 that reflects light in the blue wavelength range and transmits light in other wavelength ranges (red wavelength light in this example). The second dichroic mirror 122 transmits light in the green wavelength range and reflects light in the other wavelength ranges (in this example, red and blue wavelengths).

  The light source device 10 causes the first dichroic mirror 121 to reflect (in this example, a right angle or a substantially right angle) the blue light beam Lb that travels in a predetermined traveling direction, while it also travels in a predetermined traveling direction (blue in this example). The red light beam Lr traveling in a direction orthogonal or substantially orthogonal to the traveling direction of the light beam Lb is transmitted so as to overlap the blue light beam Lb.

  Further, the light source device 10 causes the second dichroic mirror 122 to reflect the red light beam Lr and the blue light beam Lb from the first dichroic mirror 121 (in this example, a right angle or a substantially right angle) while The green light beam Lg traveling in the traveling direction (in this example, the direction orthogonal or substantially orthogonal to the traveling direction of the red light beam Lr and the direction parallel or substantially parallel to the traveling direction of the blue light beam Lb) is converted into the red light. The beam Lr and the blue light beam Lb are transmitted so as to overlap with each other.

  Thus, the first dichroic mirror 121 and the second dichroic mirror 122 combine the plurality of light beams Lg, Lr, Lb respectively emitted from the plurality of light source units 10g, 10r, 10b into a combined light beam Lmix.

  The light source device 10 further includes an aperture member 13. That is, the optical system 10a further includes the aperture member 13. The aperture member 13 has an opening 13a for shaping the combined light beam Lmix obtained by superposing a plurality of light beams Lg, Lr, Lb into a beam diameter of a predetermined size. A conventionally known aperture member can be used as the aperture member 13, and detailed description thereof is omitted here.

  The light source device 10 further includes a reflection mirror section 14. That is, the optical system 10a further includes the reflection mirror section 14. The reflection mirror section 14 reflects the combined light beam Lmix shaped into a beam diameter of a predetermined size by the opening 13 a in the aperture member 13 toward the scanning device 20.

  The scanning device 20 scans the combined light beam Lmix from the light source device 10 and projects it onto the projection target SC.

  The external device 200 may be provided integrally with the projection device 100. Further, in the projection device 100, the projection target SC may be housed in one housing.

[First Embodiment]
In the conventional configuration, the number of optical elements (three) forming the light combining unit is equal to the number of light source units (three), but according to the present embodiment, the light combining unit 120 is formed. Since the number of optical elements (dichroic mirrors in this example) is smaller than the number of light source sections 10g, 10r, 10b (three in this example) (two in this example), The number of optical elements (two in this example) forming the light combining unit 120 can be made smaller than the conventional configuration (three). Therefore, the light amount loss (for example, the light amount loss due to the angle error, the light reflectance, the position error, the light transmittance, etc.) can be reduced, and the light utilization efficiency can be improved.

(First embodiment-1)
In the projection device 100 including the light source device 10, the brightness modulation of the plurality of light beams Lg, Lr, and Lb emitted from the light source parts 10g, 10r, and 10b in the light source device 10 is performed based on the image signal from the external device 200. For example, pulse width modulation or power modulation) is performed and the combined light beam Lmix that is superimposed by the light source device 10 is emitted toward the scanning device 20, and the combined light beam Lmix scanned by the scanning device 20 is projected onto a projection object SC such as a screen. The image is projected on the correction lens 30. Then, the projection device 100 causes a person to visually recognize an image displayed on the projection target SC by the light reflected by the projection target SC or the light transmitted through the projection target SC.

  By the way, it is known that when humans receive visible light from their eyes (retina), how they perceive brightness varies depending on the wavelength. expressed.

  That is, the relative luminous efficiency is also referred to as spectral luminous efficiency, and when the light energy is the same, the sense of brightness (sensitivity) of light at the wavelength (generally 555 nm) at which a person feels the brightest is 1, It refers to the relative brightness of other light. FIG. 9 is a graph showing the relative luminous efficiency with respect to the wavelength of light.

  As shown in FIG. 9, for example, a relative ratio of red (R) (peak wavelength 640 nm in the illustrated example), green (G) (peak wavelength 530 nm in the illustrated example), and blue (B) (peak wavelength 450 nm in the illustrated example) The sensitivity is green (G)> red (R)> blue (B), and the sense of brightness of light is relatively easy to be perceived in green. Hard to see. Therefore, since humans perceive light having a wavelength (color) having a high relative luminous efficiency as bright, it is desired to improve light utilization efficiency for light having a wavelength (color) having a large relative luminous efficiency.

  In this respect, the light source device 10 is incident on the maximum luminous efficiency light beam (specifically, the green light beam Lg) which is the light beam having the highest relative luminous efficiency among the plurality of light beams Lg, Lr, Lb. The number of optical elements (dichroic mirrors in this example) to be set is the same as the number of optical elements (dichroic mirrors in this example) that are incident on other light beams (specifically, the red light beam Lr and the blue light beam Lb). It is configured to be less than the number.

  In the present embodiment, the green light beam Lg enters the dichroic mirror once (in this example, enters the second dichroic mirror 122). The red light beam Lr enters the dichroic mirror twice (in this example, the first dichroic mirror 121 and the second dichroic mirror 122 enter once). The blue light beam Lb is incident on the dichroic mirror twice (in this example, the first dichroic mirror 121 and the second dichroic mirror 122 are incident once, respectively).

  With this configuration, the light utilization efficiency of the light beam with the maximum relative luminous efficiency (specifically, the green light beam Lg) is higher than that of the other light beams (specifically, the red light beam Lr and the blue light beam Lb). Therefore, the light projected on the projection target SC such as a screen can be made brighter by a person.

(First embodiment-2)
The light source device 10 is an optical element that is incident on the light beams Lg, Lr, Lb as the relative luminous efficiency of the plurality of light beams Lg, Lr, Lb increases (specifically, in the order of blue, red, and green). It is configured to reduce the number of.

  In the present embodiment, as described above, the green light beam Lg enters the dichroic mirror once. The red light beam Lr enters the dichroic mirror twice. Further, the blue light beam Lb enters the dichroic mirror twice. The blue light beam Lb may enter the dichroic mirror more than the red light beam Lr.

  With such a configuration, the light utilization efficiency can be increased as the relative luminosity increases, and thus the light projected on the projection target SC according to the luminosity can be made brighter by a person.

(First embodiment-3)
By the way, in the optical element (the dichroic mirror in this example) that reflects the light beams Lg, Lr, Lb, if the light reflectance decreases, the loss of the light amount increases, and the light utilization efficiency decreases accordingly. Further, in the optical element (the dichroic mirror in this example) that reflects the light beams Lg, Lr, Lb, the light utilization efficiency is lowered in the aperture 13a of the aperture member 13 due to an error such as an angle error. Therefore, considering the reflection of the light beams Lg, Lr, and Lb to the optical element, the light utilization efficiency of the light beam having the maximum relative luminous efficiency (specifically, the green light beam Lg) is compared with that of other light beams (specifically, Is desired to be improved over the red light beam Lr and the blue light beam Lb).

  In this regard, the light source device 10 sets the number of optical elements (dichroic mirrors in this example) reflected by the maximum luminous efficiency light beam (specifically, the green light beam Lg) to other light beams (specifically, Is configured to have a smaller number of optical elements (dichroic mirrors in this example) that are reflected by the red light beam Lr and the blue light beam Lb.

  In the present embodiment, the green light beam Lg does not substantially reflect from the dichroic mirror (the second dichroic mirror 122 in this example). The red light beam Lr is reflected once by the dichroic mirror (in this example, by the second dichroic mirror 122). The blue light beam Lb is reflected twice by the dichroic mirror (in this example, the first dichroic mirror 121 and the second dichroic mirror 122 are reflected). The red light beam Lr may be reflected by the dichroic mirror as many times as the blue light beam Lb.

  With this configuration, the light utilization efficiency of the light beam with the maximum relative luminous efficiency (specifically, the green light beam Lg) is higher than that of the other light beams (specifically, the red light beam Lr and the blue light beam Lb). Therefore, the light projected on the projection target SC can be made brighter by a person.

(First embodiment-4)
The light source device 10 is an optical element that is reflected by the light beams Lg, Lr, Lb as the relative luminous efficiency of the plurality of light beams Lg, Lr, Lb increases (specifically, in the order of blue, red, and green). (In this example, the number of dichroic mirrors) is reduced.

  In the present embodiment, as described above, the green light beam Lg does not substantially reflect on the dichroic mirror. The red light beam Lr is reflected by the dichroic mirror once. The blue light beam Lb is reflected twice by the dichroic mirror.

  With such a configuration, the light utilization efficiency can be increased as the relative luminosity increases, and thus the light projected on the projection target SC according to the luminosity can be made brighter by a person.

(First embodiment-5)
By the way, a loss due to reflection (for example, an angle error or a loss due to light reflectance) is usually larger than a loss due to transmission (for example, a position error or a loss due to light transmittance). Therefore, it is desired to eliminate the loss due to the reflection of the optical element having the higher relative visibility.

  In this regard, in the light source device 10, the light combining unit 120 transmits an optical beam having a higher relative luminosity factor among the incident light beams, and reflects an optical beam having a lower relative luminosity factor ( In this example, the first dichroic mirror 121 and the second dichroic mirror 122) are included.

  In the present embodiment, the dichroic mirror (the first dichroic mirror 121 in this example) transmits the red light beam Lr, which has a higher relative visibility, while transmitting the blue light beam Lb, which has a lower relative visibility. reflect. Further, the dichroic mirror (the second dichroic mirror 122 in this example) transmits the green light beam Lg having the higher relative luminosity, while transmitting the red light beam Lr and the blue light beam having the lower luminosity. Reflect Lb.

  With such a configuration, it is possible to eliminate the loss due to the reflection of the optical element having the higher relative visibility in the optical element, and thus it is possible to improve the light utilization efficiency of the light beam having the higher relative visibility, and accordingly, the projection target is increased. The light projected on the body SC can be made brighter for a person.

(First Embodiment-6)
The light source device 10 is configured such that the number of optical elements (dichroic mirrors in this example) that are incident on the light beam having the maximum relative luminous efficiency (specifically, the green light beam Lg) is one.

  Specifically, in the light source device 10, the maximum relative luminous efficiency light beam (specifically, the green light beam Lg) is transmitted only to the second dichroic mirror 122 of the first dichroic mirror 121 and the second dichroic mirror 122. Incident.

  With such a configuration, the light utilization efficiency of the light beam having the maximum relative luminous efficiency (specifically, the green light beam Lg) can be further improved, and the light projected on the projection target SC can be made brighter by the person. be able to.

(First Embodiment-7)
By the way, as described above, the loss due to reflection (for example, the angle error or the loss due to the light reflectance) is usually larger than the loss due to the transmission (for example, the position error or the loss due to the light transmittance). Therefore, it is desirable to eliminate the loss due to reflection with respect to the light beam having the maximum relative visibility in the optical element.

  In this respect, the light source device 10 is configured to pass the light beam with the maximum relative luminous efficiency (specifically, the green light beam Lg) through one optical element (the second dichroic mirror 122 in this example).

  Specifically, in the light source device 10, the light beam with the maximum relative luminous efficiency (specifically, the green light beam Lg) passes through the second dichroic mirror 122 and then enters the aperture member 13.

  With such a configuration, it is possible to eliminate a loss due to reflection (for example, an angle error or a loss due to a light reflectance, especially a loss due to an angle error) with respect to a light beam having a maximum relative visibility in the optical element. The light utilization efficiency for the light beam can be improved, and the light projected on the projection target SC can be made brighter by a person.

[Second Embodiment]
The light source device 10 includes a plurality of light source units 10g, 10r, and 10b that emit a plurality of light beams Lg, Lr, and Lb, respectively, and a plurality of light sources 11g, 11r, and 11b. It is provided with a plurality of collimator lenses 15g, 15r, 15b which respectively enter the light beams Lg, Lr, Lb.

  Each of the plurality of light sources 11g, 11r, 11b includes a light emitting element 11g1, 11r1, 11b1 (specifically, a laser diode) and a package 11g2, 11r2, 11b2 (in this example, a box that stores the light emitting element 11g1, 11r1, 11b1). It is provided with a mold or can-shaped package, a so-called CAN package. The light sources 11g, 11r, 11b are of the same type except that the emitted light beams have different colors.

  The collimator lens 15g converts the green light beam Lg emitted from the light source 11g into parallel light or substantially parallel light. The collimator lens 15r converts the red light beam Lr emitted from the light source 11r into parallel light or substantially parallel light. The collimator lens 15b converts the blue light beam Lb emitted from the light source 11b into parallel light or substantially parallel light. The collimator lenses 15g, 15r, 15b are of the same type.

  By the way, as the beam diameter of the combined light beam Lmix in which the light beams Lg, Lb, and Lr are superposed becomes larger than the size (specifically, the diameter) of the opening 13a in the aperture member 13, the light beams Lg, Lb, and Lr become larger. This leads to a decrease in light utilization efficiency. On the other hand, the longer the focal length of the collimator lenses 15g, 15r, 15b, the larger the beam diameter of the combined light beam Lmix in which the light beams Lg, Lb, Lr are superposed. That is, the longer the focal length of the collimator lenses 15g, 15r, 15b, the lower the light use efficiency of the light beams Lg, Lb, Lr.

  FIG. 2 is a schematic cross-sectional view for explaining that the light use efficiency of the light beams Lg, Lb, Lr decreases as the focal lengths Fg, Fr, Fb of the collimator lenses 15g, 15r, 15b increase. FIG. 2A shows a state in which the combined light beam Lmix is incident on the opening 13a of the aperture member 13 when the focal lengths Fg, Fr, Fb of the collimator lenses 15g, 15r, 15b are relatively long. . FIG. 2B shows a state in which the combined light beam Lmix is incident on the opening 13a of the aperture member 13 when the focal lengths Fg, Fr, Fb of the collimator lenses 15g, 15r, 15b are relatively short. .

  2A and 2B, the light sources 11g, 11r, 11b, the light beams Lg, Lb, Lr, and the collimator lenses 15g, 15r, 15b have substantially the same configuration, They are shown together in one. Further, in FIGS. 2A and 2B, the first dichroic mirror 121 and the second dichroic mirror 122 are not shown. The graphs α1 and α2 respectively show the power distribution of the combined light beam Lmix that has passed through the aperture 13a in the aperture member 13, and the shaded portions β1 and β2 are respectively blocked by the aperture 13a in the aperture member 13. The power range is shown.

  The beam diameters of the light beams Lg, Lb, Lr depend on the spread of the light beams Lg, Lb, Lr from the light sources 11g, 11r, 11b and the long and short focal lengths Fg, Fb, Fr of the collimator lenses 15g, 15r, 15b. Change.

  That is, as shown in FIG. 2A, the longer the focal lengths Fg, Fb, Fr of the collimator lenses 15g, 15r, 15b, the larger the beam diameters of the light beams Lg, Lb, Lr. Then, the power region β1 blocked by the opening 13a in the aperture member 13 increases, that is, the region where the power of the power distribution α1 of the combined light beam Lmix is large is limited, and the light utilization efficiency of the light beams Lg, Lb, Lr is correspondingly increased. descend.

  In other words, as shown in FIG. 2B, the shorter the focal lengths Fg, Fb, Fr of the collimator lenses 15g, 15r, 15b, the smaller the beam diameters of the light beams Lg, Lb, Lr. Then, the power region β2 blocked by the opening 13a in the aperture member 13 is reduced, that is, the region in which the power of the power distribution α2 of the combined light beam Lmix is large can be used more, and the light utilization of the light beams Lg, Lb, and Lr is accordingly increased. Efficiency is improved.

  Therefore, the focal lengths Fg, Fb, Fr of the collimator lenses 15g, 15r, 15b are made as short as possible, whereby the beam diameter γ of the combined light beam Lmix in which the light beams Lg, Lb, Lr are superposed is changed to the aperture member. It is desired to improve the light use efficiency of the light beams Lg, Lb, Lr by making the size δ of the opening 13a in 13 as close as possible.

In this regard, in the light source device 10, the collimator lenses 15g, 15r, 15b are close to the packages 11g2, 11r2, 11b2 in the light sources 11g, 11r, 11b so as not to come in contact with each other (that is, predetermined from the packages 11g2, 11r2, 11b2. 2 are arranged at predetermined intervals Dg, Dr, Db (see FIG. 2B). In this example, the collimator lenses 15g, 15r, 15b are fixed to the housing 10h (see FIG. 1) of the light source device 10 with an adhesive. Here, the collimator lenses 15g, 15r, 15b are package 11g2, 11r2, 11b2. The distances Dg, Dr, Db (see FIG. 2B) between the collimator lenses 15g, 15r, 15b and the packages 11g2, 11r2, 11b2 are set to be as close as possible to the collimator lenses due to variations in parts. The distance can be set to a predetermined distance (for example, about 0.5 mm) in consideration of the deterioration of the positional accuracy due to the contact between the lenses 15g, 15r, 15b and the packages 11g2, 11r2, 11b2. In this example, the focal lengths Fg, Fb, Fr of the collimator lenses 15g, 15r, 15b are set to about 1.7 mm.

  With such a configuration, the focal lengths Fg, Fb, Fr of the collimator lenses 15g, 15r, 15b can be made as short as possible, and thus the beam diameter γ of the combined light beam Lmix can be made smaller than that of the aperture 13a of the aperture member 13. The size δ can be brought as close as possible, and the light utilization efficiency of the light beams Lg, Lb, Lr can be improved accordingly.

[Third Embodiment]
By the way, the farther the center of the optical axis of the light beams Lg, Lb, Lr forming the combined light beam Lmix from the center of the opening 13a in the aperture member 13, the lower the light utilization efficiency of the light beams Lg, Lb, Lr. Therefore, all of the centers of the optical axes of the plurality of light beams Lg, Lb, Lr are located at the center or substantially the center of the opening 13a in the aperture member 13, and the projection target SC is maintained in that state. Is desired. However, in reality, the positional deviations of the light sources 11g, 11r, and 11b, the positional deviations of the optical elements (the first dichroic mirror 121 and the second dichroic mirror 122 in this example), and the optical elements (the first dichroic mirror 121 and the second dichroic mirror 121 in this example). The light beams Lg, Lb, and Lr have angles to some extent due to factors such as deterioration in component accuracy such as an angle deviation of the dichroic mirror 122) and mounting errors, which causes the following disadvantages.

  FIG. 3 is a schematic cross-sectional view showing a state in which the centers of the optical axes of the plurality of light beams Lg, Lb, and Lr that form the combined light beam Lmix are adjusted with the aperture member 13 as a reference.

  As shown in FIG. 3, the plurality of light beams Lg, Lb, Lr forming the combined light beam Lmix are adjusted so that the centers of the optical axes are all located at the center or substantially the center of the opening 13a in the aperture member 13. However, on the projection target SC, the centers of the optical axes of the plurality of light beams Lg, Lb, and Lr are deviated. That is, when the plurality of light beams Lg, Lb, Lr are adjusted so that the centers of the optical axes thereof coincide with or substantially coincide with the center of the opening 13a in the aperture member 13, the deviation of the optical axes on the projection target SC is large. Will be.

  On the other hand, from the viewpoint of improving the image quality of the image projected on the projection target SC, the optical axes of the plurality of light beams Lg, Lb, Lr forming the combined light beam Lmix coincide with each other on the projection target SC. Alternatively, it is desirable to adjust so that they substantially match. Then, this time, the centers of the optical axes of the plurality of light beams Lg, Lb, Lr are deviated from the center of the opening 13a in the aperture member 13, and the light use efficiency of the light beams Lg, Lb, Lr is reduced. Invite. Therefore, it is desired to improve the light use efficiency of the light beams Lg, Lb, Lr in a state where the centers of the optical axes of the plurality of light beams Lg, Lb, Lr are matched or substantially matched on the projection target SC.

  In this regard, in the light source device 10, first, any one of the plurality of light beams Lg, Lb, Lr (in this example, the green light beam Lg) is used as a reference light beam. The center of the shaft is located at the center or substantially the center of the opening 13a in the aperture member 13 (preferably located at the center or substantially the center of the opening 13a and parallel or substantially parallel to the penetrating direction of the opening 13a). )adjust. Next, the optical axes of the other light beams (in this example, the red light beam Lr and the blue light beam Lb) on the projection target SC onto which the combined light beam Lmix is projected match or are substantially equal to the optical axes of the reference light beams. Adjust to match. Then, the reference light beam is a light beam having the maximum relative luminous efficiency (specifically, the green light beam Lg) from the viewpoint of improving the light utilization efficiency with respect to light having a wavelength (color) having a large relative luminous efficiency.

  FIG. 4 is a schematic cross-sectional view showing a state in which the centers of the optical axes of the plurality of light beams Lg, Lb, and Lr that form the combined light beam Lmix are adjusted with reference to the projection target SC.

  As shown in FIG. 4, the plurality of light beams Lg, Lb, and Lr that form the combined light beam Lmix are positioned in such a manner that the centers of the optical axes of the light beams Lmix, Lb, and Lr are aligned or substantially aligned on the projection target SC. One of the light beams Lg, Lb, and Lr (green light beam Lg in this example) is used as a reference light beam, and the center of the optical axis is aligned with or substantially located at the center of the opening 13a in the aperture member 13. Therefore, even if the centers of the other light beams (in this example, the red light beam Lr and the blue light beam Lb) deviate from the center of the opening 13a in the aperture member 13, the light beams of all the light beams Lg, Lb, Lr are emitted. The light utilization efficiency of the light beams Lg, Lb, and Lr can be improved rather than the center of the axis being displaced from the center of the opening 13a in the aperture member 13. Then, from the viewpoint of improving the light utilization efficiency with respect to light having a wavelength (color) having a high relative luminous efficiency, the reference light beam is set to a light beam having a maximum relative luminous efficiency (specifically, a green light beam Lg). That is, it is possible to make a person feel the light projected onto the projection target SC brightly.

  In addition, the configuration of the first embodiment-6, that is, the configuration in which the light beam with the maximum relative luminous efficiency (specifically, the green light beam Lg) is passed through one optical element (the second dichroic mirror 122 in this example). In this case, the reference light beam can be used as the light beam with the maximum relative luminous efficiency (specifically, the green light beam Lg), and the optical axis of the light beam with the maximum relative luminous efficiency can be easily aligned.

[Fourth Embodiment]
In the light source device 10, the optical elements (the first dichroic mirror 121 and the second dichroic mirror 122 in this example) forming the light combining unit 120 utilize the difference in the wavelength range of the plurality of light beams Lg, Lb, Lr. The light beams Lg, Lb, and Lr are superposed on each other.

  With such a configuration, the plurality of light beams Lg, Lb, Lr can be superposed with a simple configuration.

(Fourth Embodiment-1)
In the light source device 10, the plurality of light source units includes a green light source unit 10g for emitting a green light beam Lg having a peak at a green wavelength and a red light beam Lr for emitting a red light beam Lr having a peak at a red wavelength. It includes a light source unit 10r and a blue light source unit 10b that emits a blue light beam Lb having a peak at a blue wavelength.

  The light combining unit 120 transmits the red light beam Lr from the red light source unit 10r, while reflecting the blue light beam Lb from the blue light source unit 10b, and from the green light source unit 10g. And a second dichroic mirror 122 that reflects the red light beam Lr and the blue light beam Lb from the first dichroic mirror 121 while transmitting the green light beam Lg.

  Specifically, the green light source unit 10g and the blue light source unit 10b are arranged in parallel along the traveling direction of the red light beam Lr from the red light source unit 10r.

  According to such a configuration, an existing general-purpose member such as a dichroic mirror can be used, which allows the number of optical elements (the first dichroic mirror 121 and the second dichroic mirror 122 in this example) forming the light combining unit 120 to be plural. It is possible to easily and easily realize a configuration in which the number of light sources is smaller than the number of light source units (in this example, the green light source unit 10g, the red light source unit 10r, and the blue light source unit 10b).

  It should be noted that the first reflection mirror 141 and the second reflection mirror 142, which are not described in FIG. 1, will be described later.

[Fifth Embodiment]
By the way, since there is a limit to increase the light intensity (luminance) of the light source units 10g, 10r, and 10b themselves, a light source that emits light beams of the same color or substantially the same color having peaks at the same or substantially the same wavelength. Using a plurality of parts (for example, a plurality of green light source parts 10g to 10g, a plurality of red light source parts 10r to 10r, and a plurality of blue light source parts 10b to 10b), light beams Lg and Lr of the same color or substantially the same color. , Lb by superimposing a plurality of superimposed light beams of the same color or substantially the same color (Lg, Lr, Lb) to (Lg, Lr, Lb) on the projection target SC. Illuminance is improved. Therefore, a plurality of light source units (for example, a plurality of green light source units 10g to 10g, a plurality of red light source units 10r to 10r, which emit light beams of the same color or substantially the same color that have peaks at the same or substantially the same wavelength, It is desired to improve the illuminance of projection light when a plurality of combined light beams Lmix to Lmix of the same color or substantially the same color, which are superimposed by using the plurality of light sources for blue 10b to 10b), are projected onto the projection object SC. .

  In this respect, the light source device 10 includes a plurality of light source groups 110g, 10r, 10b and a light combining section 120 (the first dichroic mirror 121 and the second dichroic mirror 122 in this example) as one group. ˜110 (n) (n is an integer of 2 or more, n = 2 in this example), and a plurality of combined light beams Lmix (1) emitted from the plurality of light source groups 110 (1) to 110 (n), respectively. ) To Lmix (n) are superimposed on each other, and the combining element 16 (see FIG. 5) is provided. That is, the optical system 10a further includes the combining element 16.

  FIG. 5 is a schematic configuration diagram schematically showing a schematic configuration of a projection apparatus 100 including a light source device 10 including a plurality of light source groups 110 (1) to 110 (n) and a combining element 16.

  5, components that are substantially the same as the components of the projection device 100 shown in FIG. 1 are given the same reference numerals, and descriptions thereof will be omitted.

  The light source device 10 shown in FIG. 5 includes a plurality of light source groups 110 (1) and 110 (2).

  In the light source group 110 (1), the number of optical elements (dichroic mirrors in this example) forming the light combining unit 120 (1) is equal to the number of light source units 10r (1), 10g (1), and 10b (1) ( The number is three (three in this example) (two in this example). Similarly, in the light source group 110 (2), the number of optical elements (dichroic mirrors in this example) forming the light combining section 120 (2) is set to be a plurality of light source sections 10r (2), 10g (2), 10b (2). ) (3 in this example) (two in this example).

  Specifically, in the light source device 10 shown in FIG. 5, in the configuration shown in FIG. 1, the light source units 10g, 10r, 10b, the first dichroic mirror 121, the second dichroic mirror 122, and the light beams Lg, Lr, Lb are arranged in a light source group. In 110 (1), the light source units 10g (1), 10r (1), 10b (1), the first dichroic mirror 121 (1), the second dichroic mirror 122 (1) and the light beams Lg (1), Lr ( 1) and Lb (1), in the light source group 110 (2), the light source units 10g (2), 10r (2), 10b (2), the first dichroic mirror 121 (2), and the second dichroic mirror 122 (2). ) And light beams Lg (2), Lr (2), and Lb (2).

  Then, the combining element 16 combines the plurality of combined light beams Lmix (1) and Lmix (2) respectively emitted from the plurality of light source groups 110 (1) to 110 (n) to form a combined light beam Lmix. , The combined light beam Lmix is incident on the aperture member 13.

  According to this configuration, a plurality of light source units (for example, a plurality of green light source units 10g (1) to 10g (n), a plurality of light source units for emitting light beams of the same color or substantially the same color having peaks at the same or substantially the same wavelength) are emitted. Red light source units 10r (1) to 10r (n), and a plurality of blue light source units 10b (1) to 10b (n)) are used to synthesize light beams Lmix (1) to Lmix (of the same color or substantially the same color. By superimposing a plurality of n), it is possible to improve the illuminance of the projection light when the combined synthetic light beam Lmix is projected onto the projection target SC.

(Fifth Embodiment-1)
In the light source device 10 shown in FIG. 5, the combining element 16 polarizes the plurality of combined light beams Lmix (1) to Lmix (n) emitted from the plurality of light source groups 110 (1) to 110 (n), respectively. A plurality of combined light beams Lmix (1) to Lmix (n) respectively emitted from the plurality of light source groups 110 (1) to 110 (n) are superposed by utilizing the difference in the components.

  Specifically, the light beams Lg (1), Lr (1), Lb (1) emitted from the light source units 10g (1), 10r (1), 10b (1) of the light source group 110 (1), and the light source group The polarization components are different from the light beams Lg (2), Lr (2), Lb (2) emitted from the light source units 10g (2), 10g (2), 10b (2) of 110 (2). .

  With such a configuration, the plurality of combined light beams Lmix (1) to Lmix (n) can be superposed with a simple configuration.

(Fifth Embodiment-2)
In the light source device 10 shown in FIG. 5, the plurality of light source groups 110 (1) to 110 (n) are two light source groups 110 (1) and 110 (2).

  In one of the two light source groups 110 (1) and 110 (2), one light source group 110 (1) has a plurality of light source units having substantially the same configuration as the green light source unit 10g shown in FIG. Light source section 10g (1), red light source section 10r (1) having substantially the same configuration as red light source section 10r shown in FIG. 1, and blue light source section 10b having substantially the same configuration as shown in FIG. The light combining unit 120 (1) includes a first blue light source unit 10b (1), and the first dichroic mirror 121 (1) having substantially the same configuration as the first dichroic mirror 121 shown in FIG. The second dichroic mirror 122 shown in FIG. 1 and the second dichroic mirror 122 (1) having substantially the same configuration are included.

  In the other light source group 110 (2) of the two light source groups 110 (1), 110 (2), the plurality of light source units have substantially the same configuration as the green light source unit 10g shown in FIG. Light source section 10g (2), red light source section 10r (2) having substantially the same configuration as red light source section 10r shown in FIG. 1, and blue light source section 10b having substantially the same configuration as shown in FIG. The light combining unit 120 (2) includes a first dichroic mirror 121 (2) having substantially the same configuration as the first dichroic mirror 121 shown in FIG. The second dichroic mirror 122 shown in FIG. 1 and a second dichroic mirror 122 (2) having substantially the same configuration are included.

  Then, the combined light beam Lmix (1) emitted from one light source group 110 (1) has one of the polarization components (P polarization component in this example) of the P polarization component and the S polarization component. ing. The combined light beam Lmix (2) emitted from the other light source group 110 (2) has the other polarization component (S polarization component in this example) of the P polarization component and the S polarization component. .

  Specifically, the light beams Lg (1), Lr (1), Lb (1) of the P-polarized component are emitted from the light sources 11g (1), 11r (1), 11b (1) of the light source group 110 (1). Then, the light beams Lg (2), Lr (2), Lb (2) of the S polarization component are emitted from the light sources 11g (2), 11r (2), 11b (2) of the light source group 110 (2).

  Then, the synthesizing element 16 transmits one of the polarized light components (P polarized light component in this example) emitted from the one light source group 110 (1), and emits from the other light source group 110 (2). It is a polarization beam splitter that reflects the other polarization component (S polarization component in this example). Here, the P-polarized component means a polarized component of light in which an electric field oscillates in the incident surface, and the S-polarized component means a polarized component of light in which an electric field oscillates perpendicularly to the incident surface.

  The light source device 10 shown in FIG. 5 transmits a combined light beam Lmix (1) having a P-modulated component traveling in a predetermined traveling direction from one light source group 110 (1) by a polarization beam splitter acting as a synthesizing element 16. On the other hand, the other light source group 110 (2) advances in a predetermined traveling direction (in this example, a direction orthogonal or substantially orthogonal to the combined light beam Lmix (1) from the one light source group 110 (1)) and advances to S. The combined light beam Lmix (2) having the modulation component is reflected so as to overlap the combined light beam Lmix (1) from the one light source group 110 (1).

  Thus, the polarization beam splitter acting as the combining element 16 superimposes a plurality of combined light beams Lmix (1) and Lmix (2) emitted from the two light source groups 110 (1) and 110 (2), respectively. The combined light beam Lmix is used.

  Specifically, in the two light source groups 110 (1) and 110 (2), the light beams with the maximum relative luminous efficiency (green light beams Lg and Lg in this example) are transmitted through the second dichroic mirrors 122 and 122. , Enters the aperture member 13 via the combining element 16.

  The combined light beam Lmix (1) emitted from one light source group 110 (1) has an S-polarized component, and the combined light beam Lmix (2) emitted from the other light source group 110 (2) is , P polarization component, and the combining element 16 may be a polarization beam splitter that transmits the S polarization component while reflecting the P polarization component.

  According to this configuration, an existing general-purpose member such as a polarization beam splitter can be used, which allows the combined light beams Lmix (1) and Lmix (2) from the plurality of light source groups 110 (1) and 110 (2). It is possible to easily and easily realize a structure in which the two are overlapped.

[Sixth Embodiment]
By the way, the aspect ratio of the image projected from the projection device 100 onto the projection target SC is usually a long ratio that is long in the horizontal direction (for example, the aspect ratio = 16: 9).

  FIG. 6 is a schematic perspective view showing that the aspect ratio of the image projected from the projection device 100 onto the projection target SC is a long ratio that is long in the horizontal direction.

  As shown in FIG. 6, since the aspect ratio of the image projected from the projection device 100 onto the projection target SC is usually a long ratio which is long in the horizontal direction, the scanning device 20 moves from the light source device 10 to the horizontal direction. Of the combined light beam Lmix and is scanned at a predetermined first scanning angle θx in a predetermined first scanning direction X (specifically, in the horizontal direction) while being orthogonal to the first scanning direction X. Alternatively, the scanning mirror 21 scans at a second scanning angle θy smaller than the first scanning angle θx in a substantially orthogonal second scanning direction Y (specifically, a vertical direction). That is, the scanning mirror 21 swings around the axis line along the second scanning direction Y when scanning in the first scanning direction X, and moves in the first scanning direction X when scanning in the second scanning direction Y. It swings around the axis along the line.

  Then, the scanning device 20 needs to be configured on the premise that the combined light beam Lmix does not protrude from the scanning mirror 21 from the viewpoint of avoiding the disturbance of the image projected on the projection target SC.

  Then, as the incident angle φ with respect to the scanning mirror 21 (see FIGS. 7B and 8B) is larger, the beam diameter γ of the combined light beam Lmix incident on the scanning mirror 21 (FIGS. 7A and 7B). 8 (a)), that is, the size δ (see 2) of the opening 13a (see FIGS. 1 to 5) in the aperture member 13 needs to be reduced. On the other hand, the smaller the size δ of the opening 13a in the aperture member 13, the lower the light utilization efficiency of the combined light beam Lmix. Therefore, it is desired to improve the light utilization efficiency of the combined light beam Lmix as much as possible in a state where the combined light beam Lmix does not protrude from the scanning mirror 21.

  FIG. 7 is a schematic cross-sectional view schematically showing a state in which the combined light beam Lmix is incident on the scanning mirror 21 in the scanning device 20 from the first scanning direction X. FIG. 7A shows the beam diameter γ of the combined light beam Lmix incident on the scanning mirror 21 in the first scanning direction X, and FIG. 7B shows the combined light beam Lmix incident on the scanning mirror 21. The angle φ and the first scanning angle θx are shown.

  As shown in FIG. 7, when the combined light beam Lmix is made incident on the scanning mirror 21 in the first scanning direction X, the first scanning angle θx becomes relatively large (see FIG. 6), so the scanning mirror 21 When the combined light beam Lmix is incident from the outside of the scanning region, the incident angle φ of the combined light beam Lmix to the scanning mirror 21 inevitably becomes large (see FIG. 7B), and accordingly, the incident light enters the scanning mirror 21. The beam diameter γ (see FIG. 7A) of the combined light beam Lmix to be generated needs to be reduced, that is, the size δ of the opening 13a in the aperture member 13 needs to be reduced, and thus, the size of the combined light beam Lmix is reduced. This leads to a decrease in light utilization efficiency.

  In this regard, in the present embodiment, the light source device 10 is configured to make the combined light beam Lmix enter the scanning mirror 21 in the scanning device 20 from the second scanning direction Y.

  Specifically, the reflection mirror section 14 includes a first reflection mirror 141 and a second reflection mirror 142. The first reflection mirror 141 is provided on the optical path of the combined light beam Lmix from the aperture member 13. The second reflection mirror 142 is provided on one side or the other side of the second scanning direction Y with respect to the scanning mirror 21. Then, the first reflection mirror 141 reflects the combined light beam Lmix from the aperture member 13 and makes it enter the second reflection mirror. The second reflection mirror 142 reflects the combined light beam Lmix from the first reflection mirror 141 to make it enter from one side or the other side of the scanning mirror 21 in the second scanning direction Y.

  FIG. 8 is a schematic cross section schematically showing a state in which the combined light beam Lmix is incident on the scanning mirror 21 in the scanning device 20 from the second scanning direction Y. FIG. 8A shows the beam diameter γ of the combined light beam Lmix incident on the scanning mirror 21 in the second scanning direction Y, and FIG. 8B shows the combined light beam Lmix incident on the scanning mirror 21. The angle φ and the second scanning angle θy are shown.

  As shown in FIG. 8, when the combined light beam Lmix is made incident on the scanning mirror 21 in the second scanning direction Y, the second scanning angle θy becomes relatively small (see FIG. 6), and therefore the scanning mirror 21. The incident angle φ of the combined light beam Lmix to the scanning mirror 21 can be reduced even when the combined light beam Lmix is incident from the outside of the scanning region (see FIG. 8B). The beam diameter γ of the incident combined light beam Lmix (see FIG. 8A) can be increased, that is, the size δ of the opening 13a in the aperture member 13 can be increased, and thus the combined light beam Lmix can be increased. The light utilization efficiency of can be improved.

  The present invention is not limited to the embodiment described above, and can be implemented in various other forms. Therefore, the embodiment is merely an example in all respects and should not be limitedly interpreted. The scope of the present invention is indicated by the scope of claims and is not bound by the text of the specification. Further, all modifications and changes belonging to the equivalent range of the claims are within the scope of the present invention.

10 Light Source Device 10a Optical System 10b Blue Light Source 10g Green Light Source 10r Red Light Source 11b Blue Light Source 11b1 Light Emitting Element 11b2 Package 11g Green Light Source 11g1 Light Emitting Element 11g2 Package 11r Red Light Source 11r1 Light Emitting Element 11r2 Package 13 Aperture Member 13a Opening 14 Reflection mirror part 15b Collimator lens 15g Collimator lens 15r Collimator lens 16 Synthetic element (polarization beam splitter)
20 scanning device 21 scanning mirror 22 actuator 30 correction lens 100 projection device 110 light source group 120 light combining unit 121 first dichroic mirror 122 second dichroic mirror 141 first reflection mirror 142 second reflection mirror 200 external device Db distance Dg distance Dr distance Fb Focal length Fg Focal length Fr Focal length Lb Blue light beam Lg Green light beam Lr Red light beam Lmix Combined light beam SC Projected object X First scanning direction Y Second scanning direction α1 Power distribution α2 Power distribution β1 Power region β2 Power region γ Beam diameter δ Aperture size θx First scanning angle θy Second scanning angle φ Incident angle

Claims (10)

A plurality of light source units respectively emitting a plurality of light beams having peaks at mutually different wavelengths, and a light combining unit including an optical element that superimposes the plurality of light beams are provided, and the plurality of light beams are superposed. A light source device for emitting a combined light beam,
It is configured such that the number of the optical elements forming the light combining unit is smaller than the number of the plurality of light source units,
A plurality of light source groups including the plurality of light source sections and the light combining section as a group, and a combining element that combines a plurality of the combined light beams emitted from the plurality of light source groups,
The plurality of light source groups is two light source groups,
In each of the two groups of light sources, the plurality of light source units respectively emit the plurality of light beams, and the light combining unit transmits one light beam of the plurality of light beams. A first dichroic mirror that reflects another light beam, and a second dichroic mirror that transmits the other light beam while reflecting the one light beam and the other light beam from the first dichroic mirror Including,
The combined light beam emitted from one light source group of the two light source groups has one polarization component of the P polarization component and the S polarization component, and is emitted from the other light source group. The combined light beam having the other polarization component of the P polarization component and the S polarization component,
The combining element is a polarization beam splitter that transmits any one of the polarization components emitted from the one light source group and reflects the other polarization component emitted from the other light source group. A light source device characterized by the above. The light source device according to claim 1, wherein
Among the plurality of light beams, the number of the optical elements on which the light beam with the largest relative luminous efficiency is incident is made smaller than the number of the optical elements on which the light beam with the smallest relative luminous efficiency is incident. A light source device characterized in that The light source device according to claim 1 or 2, wherein
Of the plurality of light beams, the number of the optical elements that reflect the light beam having the largest relative luminous efficiency, which is the light beam having the largest relative luminous efficiency, is smaller than the number of the optical elements that reflect other light beams. A light source device having the above structure. The light source device according to claim 3,
A light source device having a configuration in which the number of the optical elements that reflect the light beams is reduced as the relative luminous efficiency of the plurality of light beams increases. The light source device according to any one of claims 1 to 4,
The light combining unit includes the optical element that transmits a light beam having a higher relative luminosity factor among the incident light beams and reflects a light beam having a lower luminosity factor. Light source device. The light source device according to any one of claims 1 to 5,
In each of the light source groups, the number of the optical elements to which the light beam with the maximum relative luminous efficiency, which is the light beam with the highest relative luminous efficiency among the plurality of light beams, is incident, is set to one. A light source device characterized in that It is a light source device as described in any one of Claim 1 to Claim 6,
The light source unit includes a plurality of light sources that respectively emit the plurality of light beams, and a plurality of collimator lenses that respectively enter the light beams from the plurality of light sources,
Each of the plurality of light sources includes a light emitting element and a package that houses the light emitting element,
The light source device, wherein the collimator lens is arranged so as to be close to the package in the light source so as not to come into contact with the package. The light source device according to any one of claims 1 to 7,
The plurality of light source units are a red light source unit that emits a red light beam having a red wavelength peak, a green light source unit that emits a green light beam having a green wavelength peak, and a blue wavelength. And a blue light source that emits a blue light beam having a peak at,
The first dichroic mirror transmits the red light beam from the red light source unit while reflecting the blue light beam from the blue light source unit, and the second dichroic mirror is used for the green light beam unit. A light source device, which transmits a green light beam from a light source unit and reflects the red light beam and the blue light beam from the first dichroic mirror.   A projection device comprising the light source device according to claim 1. The projection device according to claim 9,
A second beam which is orthogonal or substantially orthogonal to the first scanning direction while being incident with the combined light beam from the light source device and scanning the beam in a predetermined first scanning direction in a predetermined first scanning angle. A scanning device having a scanning mirror for scanning at a second scanning angle smaller than the first scanning angle in the scanning direction;
A projection apparatus configured to cause the combined light beam to enter the scanning mirror in the scanning apparatus from the second scanning direction.

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