JP2014207083A - Light source device and image projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device capable of becoming more compact than ever.SOLUTION: A light source device includes a plurality of light source-lens pairs that comprise one light source 2 and one lens 3 arranged in the state of facing the light source. The lens 3 of the light source-lens pair has a shape long in one direction. The plurality of light source-lens pairs are arranged in a predetermined manner so that at least lens sides, along a longitudinal direction, of the lens 3 of each pair can adjoin each other.

Description

  The present invention relates to a light source device and an image projection device.

In an image projection apparatus (also referred to as “projector”), conventionally, an ultra-high pressure mercury lamp or a halogen lamp has been mainly used as a light source.
In recent years, the brightness of semiconductor light sources such as LEDs (Light Emitting Diodes) and LDs (Laser Diodes) has been improved, and projectors using these as light sources are being put into practical use.
The semiconductor light source has a longer life than the ultra-high pressure mercury lamp and the halogen lamp, and has excellent characteristics such as “a wide color reproduction range” as a light source for a projector.

  However, when used as a light source for a projector, the brightness does not reach the above-mentioned lamp when comprehensively evaluated such as input / power consumption, housing size, and necessity of a cooling mechanism.

  That is, some projectors using an ultra-high pressure mercury lamp can project an image having a brightness of 4000 to 5000 lumens or more on a screen.

On the other hand, in a projector using LEDs of three colors of red (R), green (G), and blue (B), the brightness of the image on the screen is about several hundred lumens to about 1,000 lumens.
Even in a projector using “LD, LED, and phosphor hybrid light source”, the brightness of the image on the screen is about 2000 to 3000 lumens.

  In order to eliminate such a lack of brightness, a method is known in which a plurality of semiconductor light sources are used and the emitted light from these is combined with “illumination light having high light intensity” (Patent Documents 1 and 2).

  When a “plurality of semiconductor light sources” is used in the light source device, the light source device tends to be large.

  When using a plurality of semiconductor light sources, it is important to increase the density of the semiconductor light sources in order to avoid an increase in the size of the light source device.

  Further, light emitted from a semiconductor light source is generally converted into a parallel light beam or the like by a collimator lens or the like provided corresponding to each semiconductor light source.

  In order to reduce the size of the light source device, it is important to increase the arrangement density of the collimator lenses and the like in accordance with the increase in the arrangement density of the semiconductor light sources.

  In the light source devices disclosed in Patent Documents 1 and 2, sufficient consideration is not necessarily given to such “higher density of arrangement of collimator lenses and the like”.

  This invention makes it a subject to implement | achieve the light source device which can be made more compact in view of the situation mentioned above.

  The light source device of the present invention has a plurality of light source / lens pairs each composed of one light source and one lens arranged opposite to the light source, and the lenses in the light source / lens pair are long in one direction. The plurality of light source / lens pairs are arranged in a predetermined arrangement so that at least the lens sides along the longitudinal direction of the lenses in each pair are adjacent to each other.

  In the light source device of the present invention, the light source device can be made compact.

It is a figure for demonstrating one Embodiment of a light source device. It is a figure for demonstrating the light source and positive lens in embodiment of FIG. It is a figure for demonstrating the arrangement | positioning state of the some positive lens in embodiment of FIG. It is a figure for demonstrating the example of the positive lens of a shape different from the positive lens of embodiment of FIG. 1, and its arrangement | positioning state. It is a figure for demonstrating another form of implementation of a light source device. It is a figure for demonstrating the other form of implementation of a light source device. It is a figure for demonstrating the further another form of implementation of a light source device. It is a figure for demonstrating the measurement of the illumination intensity distribution of the laser beam radiated | emitted from each light source of the light source device, and was parallel-beam-formed by the positive lens. It is a figure which shows the measurement result of the illumination intensity distribution by simulation. It is a figure which shows the illumination intensity distribution in the measurement position of a comparative example. It is a figure which shows illuminance distribution when the light beam of illuminance distribution of FIG. 9 is condensed on a common condensing part. It is a figure which shows the illuminance distribution of x direction and y direction of the illuminance distribution of FIG. It is a figure which shows illuminance distribution when the light beam of illuminance distribution of FIG. 10 is condensed on a common condensing part. It is a figure which shows the illuminance distribution of x direction and y direction of the illuminance distribution of FIG. It is a figure which shows one Embodiment of the light source device of a multi-primary color. It is a figure for demonstrating one Embodiment of an image projection apparatus.

Hereinafter, embodiments will be described. FIG. 1 is a diagram showing one embodiment of a light source device.
The light source device of FIG. 1 is a “light source device for condensed light flux”.

  In FIG. 1, reference numeral 1 denotes a “holder”, reference numeral 2 denotes a “light source”, reference numeral 3 denotes a “positive lens”, reference numeral 4 denotes a “condensing lens”, and reference numeral 5 denotes a “wheel”.

  The light source 2 is a “semiconductor light source (hereinafter also referred to as“ solid light source ”)”, which is an LD in this example, and is hereinafter referred to as an LD 2.

In the example of this embodiment, the LD 2 emits laser light in a blue region having a wavelength of 440 nm to 445 nm.
The holder 1 is a holder for holding a light source, and the holder 1 holds a plurality of LDs 2. The holder 1 includes a cooling unit (not shown) such as a heat pipe and a cooling fan.

  The positive lens 3 is a “collimator lens” as an optical function, and is provided in one-to-one correspondence with each LD 2, and converts the emitted light from the corresponding LD 2 into a parallel light flux.

  The plurality of positive lenses 3 are fixedly held by the holder 1 by adjusting the positional relationship with the LD 2 by an appropriate fixing means (not shown).

  The individual LD 2 and the positive lens 3 corresponding to each LD 2 constitute a “light source / lens pair”.

  Therefore, a plurality of light source / lens pairs are held by the holder 1.

  In the example of FIG. 1, the light source / lens pair is arranged so that “the light emitting portion of the LD 2 is positioned at the focal point of the positive lens 3 corresponding to this”.

  The light emitting portion of the LD 2 has a rectangular shape, and the center of the rectangular light emitting portion is located on the optical axis of the positive lens 3.

  Accordingly, the plurality of light beams emitted from the plurality of LDs 2 and converted into parallel light beams by the positive lens 3 form a “parallel light beam group parallel to each other”.

  The plurality of parallel light beams are incident on the condensing lens 4 and are condensed and condensed on a “common condensing unit”. This common condensing unit is the focal position of the condensing lens 4.

  The laser light emitted from the LD 2 will be described with reference to FIG.

  FIG. 2C illustrates the state where the LD 2 is viewed from the light emitting side. LD2 is a so-called edge-emitting semiconductor laser, and reference numeral 21 denotes a rectangular light emitting part.

  2A, the direction indicated by the arrow A (referred to as the A direction) corresponds to the short direction of the light emitting unit 21 in FIG.

  In FIG. 2B, the direction indicated by the arrow B (referred to as the B direction) corresponds to the longitudinal direction of the light emitting unit 21 in FIG.

  The laser beam LB emitted from the LD 2 is diverging light that diverges from the center of the light emitting unit 21, but the divergence angle differs between the A direction and the B direction.

  That is, the divergence angle in the A direction of the laser beam LB is larger than the divergence angle in the B direction.

  That is, the laser beam LB emitted from the LD 2 diverges in an “elliptical cone”.

  The laser beam LB is emitted from the entire light emitting unit, and the virtual starting point of divergence in the A direction and the virtual starting point of divergence in the B direction are inside the light emitting unit and the depths thereof are different.

  The light beam cross-sectional shape (far field pattern) of the laser light beam LB that diverges into an elliptical cone is an elliptical shape that is long in the A direction, as shown in FIG.

  The A direction in the cross-sectional shape of the laser light beam LB shown in FIG. 2D is referred to as a “long axis direction”, and the B direction is referred to as a “short axis direction”.

FIG. 2E is a diagram for explaining the shape of the positive lens 3.
The positive lens 3 in the embodiment being described has a shape in which both sides of the lens are cut off symmetrically with respect to a plane including the lens optical axis.

  For this reason, the shape of the positive lens 3 is long in one direction (vertical direction in FIG. 2E). FIG. 2F is a perspective view showing the shape of the positive lens 3.

  Reference numeral 3a in FIG. 2 (f) indicates a “cut section”.

  As shown in FIG. 2E, the positive lens 3 is provided such that the long axis direction in the cross-sectional shape of the laser beam LB incident from the corresponding LD 2 is parallel to the lens longitudinal direction.

  As a method of forming the positive lens 3 shown in FIG. 2E, a method of cutting a circular lens shown by a broken line in FIG. 2 or a method of processing by polishing can be considered.

  Moreover, you may mold using the metal mold | die according to the lens shape of the positive lens 3. FIG.

  FIG. 3 shows an example of the arrangement of a plurality of positive lenses 3.

  A plurality (12 in the figure) of positive lenses 3 are arranged at equal intervals on a circumference of radius: r.

  The plurality of LDs 2 are the same in number as the positive lenses 3 and are arranged at equal intervals on the circumference with the focal point of each positive lens 3 being matched with the center of the light emitting unit.

  The direction of the light emitting portion in each LD 2 is determined so that “the major axis direction of the elliptical shape of the light beam cross section is parallel to the longitudinal direction of the corresponding positive lens 3”, as shown in FIG.

  In FIG. 3, reference numeral 0 is “radius: center of circle of r”. The center 0 is an “arrangement center” of the circumferential arrangement of the plurality of positive lenses 3.

  The plurality of positive lenses 3 are arranged such that lens sides along the longitudinal direction are adjacent to each other.

  As shown in FIG. 1, the laser light emitted from the plurality of LDs 2 and transmitted through the corresponding positive lens 3 becomes a plurality of parallel light beams parallel to each other.

The plurality of parallel light beams are incident on the condensing lens 4 in parallel with the optical axis, and are collected by the condensing lens 4 for each parallel light beam.
The optical axis of the condenser lens 4 passes through the “arrangement center”.

  Each laser beam incident on the condensing lens 4 is a parallel light beam and parallel to the optical axis of the condensing lens 4. Therefore, if the aberration is ignored, the laser light is collected at the focal point of the condensing lens 4.

  That is, the focal position of the condensing lens 4 is a “common condensing part” for a plurality of parallel light beams.

  The wheel 5 is installed in this common light condensing part.

  In the embodiment of FIG. 1, the optical axis of the condenser lens 4 is orthogonal to the wheel 5.

  Since the plurality of LDs 2 are located on the same circumference centered on the optical axis of the condenser lens 4, the “image height” of the image formed by the condenser lens 4 is the same for all the LDs 2.

  For this reason, the aberration amount of the condensed image by the condensing lens 4 becomes the same for all the LDs 2, and the installation position of the wheel 5 can be set to an optimum position including the influence of the aberration.

  In addition, “a lens design that reduces aberrations only at a position where a parallel light beam enters” of the condenser lens 4 is also possible.

  Considering the case of using a plurality of “circular positive lenses” instead of the positive lens 3 in the above embodiment, it is necessary to prevent the adjacent circular positive lenses from mechanically interfering with each other.

  In this case, if twelve positive lenses are arranged in the same manner as in the above embodiment, the radius of the “circumference around which the circular positive lens is arranged” must be larger than the radius of the above embodiment: r. Absent.

That is, the arrangement portion of the light source and the circular positive lens is larger than that in the above embodiment.
And the lens diameter of the condensing lens 4 must be enlarged.

  In this way, the light source device is increased in size.

  In the above-described embodiment, the shape of the positive lens 3 is “long in one direction”, and the arrangement of the positive lenses is set so that the lens sides along the longitudinal direction are adjacent to each other.

  Accordingly, the interval between the adjacent positive lenses 3 can be effectively reduced, the radius r of the circumferential arrangement of the positive lenses 3 can be effectively reduced, and the lens diameter of the condenser lens 4 can also be reduced.

  Therefore, a bright light source device with an increased arrangement density of light sources can be configured compactly.

  In addition, since the longitudinal direction of the positive lens 3 is parallel to the major axis direction of the cross section of the incident laser beam LB, the laser beam LB emitted from the light source can be efficiently captured.

  In the embodiment described above, the positive lens 3 has a “shape obtained by cutting away lens portions on both sides of the optical axis of a circular lens”, and two linear portions along the longitudinal direction are parallel to each other.

  However, the shape of the positive lens is not limited to such a shape.

  FIG. 4A shows another example of the shape of “a positive lens long in one direction”.

  In the positive lens 3A shown in FIG. 4A, two sides along the longitudinal direction (vertical direction in the figure) are non-parallel and “narrow” downward in the figure.

FIG. 4B shows a state in which the positive lens 3A is “circularly arranged”.
As shown in this figure, each of the plurality of positive lenses 3A has a “non-parallel linear shape in which two sides along the longitudinal direction (vertical direction in the figure) narrow toward the arrangement center 0”.

  In such an arrangement of the positive lenses 3A, the interval between the adjacent positive lenses 3A can be made smaller than in the case of the arrangement of the positive lenses 3 in the embodiment.

  Therefore, the radius of the circumference where the positive lens 3A is disposed: r0 can be made smaller than the radius: r in the above embodiment, and the light source device can be further miniaturized.

  In the above, the embodiment in which the light source / lens pair is arranged in a single circumferential shape has been described.

  By arranging the light source / lens pair concentrically in a double or more circumferential shape, the number of light sources to be arranged can be increased and the light intensity of the light source device can be increased.

  5 and 6 are diagrams showing an embodiment of such a configuration.

  The embodiment shown in FIG. 5 is an example in which the same positive lens 3 as that of the embodiment described with reference to FIGS. 1 to 3 is used, and these are arranged in a double circle concentrically.

  The LD, which is an individual light source, is arranged with the light emitting portion aligned with the focal position of the corresponding positive lens 3 and with the long axis direction of the light beam cross section parallel to the longitudinal direction of the positive lens.

  In the example shown in FIG. 5, 24 pairs of “light source / lens pairs of LD 3 and positive lens 3” are arranged concentrically. The radius of the small circumference is r1, and the radius of the large circumference is r2.

  The radius: r1 of the light source / lens pair arranged on the small circumference may be the same as the radius: r in the embodiment described with reference to FIGS.

  As described above, by using twice the light source as in the above-described embodiment, the luminance of the light source device can be increased.

  If the output of each LD is the same, for example, 3.5 W, there are 24 LDs in total, so the output of the entire light source device is 3.5 × 24 = 84 W.

  In the example described above, the positive lenses 3 and 3A have a shape obtained by excising the “portions on both sides of the optical axis” of the circular lens, and the length in the longitudinal direction is equal to the diameter of the circular lens.

  However, the shape of the positive lens is not limited to this.

  That is, the length of the positive lens in the longitudinal direction may be further shortened. 6A and 6B show two examples of such positive lenses.

  In the positive lens 3B shown in FIG. 6A, the vertical direction in the figure is the longitudinal direction, but the lower end portion in the figure is cut and cut in a straight line, and the size in the length direction is “smaller”. "It has become.

  In the positive lens 3C shown in FIG. 6B, the vertical direction in the drawing is the longitudinal direction, but the upper end portion and the lower end portion in the drawing are cut in a straight line and cut off. It's getting smaller.

  FIG. 6C shows an example in which the light source / lens pair is arranged in a double concentric circle, and the inner arrangement on the circumference of radius r is “by the positive lens 3 and the LD. "Light source / lens pair".

  On the circumference of the outer radius r3, a light source / lens pair formed by the LD and the positive lens 3B in FIG. 6A is arranged.

  The positive lens 3 </ b> B in the light source / lens pair arranged on the outer circumference has a smaller length in the longitudinal direction than the positive lens 3.

  Therefore, the radius of the outer circumference: r3 can be made smaller than the radius: r2 (= r) in the case of FIG. 5, and the light source device can be made more compact.

  In the embodiment described above, the LD 2 that is the light source in the light source / lens pair is disposed at the focal position on the optical axis of the positive lens 3 or the like.

However, the positional relationship between the light source and the positive lens is not limited to this case.
The embodiment shown in FIG. 7 is an example of an arrangement in which the positional relationship between the light source 2 and the positive lens 3 is shifted in a direction orthogonal to the optical axis of the positive lens 3.

  As shown in FIG. 7B, when the LD 2 is shifted by “Δ” in the direction orthogonal to the optical axis ax on the focal plane of the positive lens 3, the emission direction of the parallel light beam (laser light) from the positive lens 3 is deflected. .

The deflection angle: θ at this time is based on the focal length f of the positive lens 3 and the above “Δ”.
θ = arctan (Δ / f)
Determined by

  In the example shown in FIG. 7A, the optical axis of the corresponding positive lens is closer to the optical axis AX of the condenser lens 4 with respect to the plurality of LDs 2 arranged on the same circumference. It is shifted.

  For this reason, the laser light deflected by each positive lens 3 enters the condenser lens 4 while approaching the optical axis AX and is condensed.

  In this way, the deflection of the optical path by the positive lens 3 and the condensing by the condensing lens 4 can be used together to shorten the distance from the LD 2 to the “common condensing part” where the wheel is disposed.

  In such a configuration, the lens diameter of the condenser lens 4 can be reduced as compared with the embodiment of FIG. 1 and the like, and the distance from the condenser lens 4 to the “common condenser part” is also short. Become.

  Therefore, the light source device can be configured to be “more compact”.

  In the optical arrangement shown in FIG. 7A, the plurality of parallel light beams incident on the condenser lens 4 are inclined with respect to the optical axis AX.

  For this reason, although the condensing points of the individual parallel light beams are slightly shifted from the optical axis AX, they overlap each other in a minute area region at a position from the condensing lens 4 near the condensing point position.

  Therefore, what is necessary is just to arrange | position a wheel in this micro area position.

  In the embodiment shown in FIG. 7, it goes without saying that the positive lens is not limited to the positive lens 3 shown in FIG. 7, and the positive lenses 3A, 3B, and 3C described above may be used.

  Hereinafter, the distribution of laser light in the embodiment shown in FIG. 5 will be described.

  In FIG. 8, the LD 2 is caused to emit light, and the distribution of the parallel light beam emitted from the positive lens (collimator lens) 3 is measured by a ray tracing simulation at the “measurement position”.

  The light source / lens pair is arranged in a double concentric shape as shown in FIG.

  The result of the simulation is shown in FIG.

  Note that the LD 2 and the positive lens 3 are arranged circumferentially at unequal intervals.

  As shown in FIG. 9, the position of the LD 2 is set so that the major axis direction of the cross-sectional shape of the laser beam emitted from each LD 2 is directed toward the center of the arrangement.

  As a comparative example, FIG. 10 shows a simulation result when the minor axis direction of the cross-sectional shape of the laser beam emitted from the LD 2 is directed toward the arrangement center.

  The software used for the ray tracing simulation is LighTools (64) 7.3.0 (trade name) of Synopsys.Inc.

  In the case of the arrangement of the light source / lens pair shown in FIG. 9, the illuminance distribution in the common condensing part by the condensing lens is shown in FIG.

  In this state, the laser beams emitted from the 21 LDs are condensed on a common condensing unit.

  FIG. 12 shows the illuminance distribution on the cross sections in the x direction and the y direction in this condensed state.

  The illuminance distribution of each cross section in the x and y directions is substantially equal, and a sharp distribution is obtained.

  As a comparative example, FIG. 13 shows the illuminance distribution in the common light condensing part by the condensing lens in the LD arrangement state shown in FIG.

  FIG. 14 shows the illuminance distribution on the cross section in the x and y directions of the illuminance distribution of FIG.

  As can be seen from FIG. 14, the illuminance distribution is “decreased near the center”, indicating that the light collection state is not good.

  The difference in illuminance distribution as shown in FIGS. 12 and 14 due to the difference in the arrangement of the LD is considered to be due to the difference between the meridional and sagittal aberrations of the condenser lens 4.

  FIG. 15 is an explanatory diagram showing one embodiment of a “multi-primary light source device”.

  Since it is explanatory drawing, optical systems, such as a lens, are simplified and shown.

  In FIG. 15, a portion denoted by reference numeral 10 is the light source device for the condensed light beam shown in FIG. 1, and the wheel 5 is disposed in the common light collecting portion.

  In FIG. 1, the wheel 5 orthogonal to the optical axis of the condenser lens 4 is shown, but in the example of FIG. 14, the wheel 5 is inclined with respect to the optical axis of the condenser lens.

  The light source used in the light source device 10 is the aforementioned “LD emitting blue laser light having a wavelength of 440 nm to 445 nm (hereinafter also referred to as“ blue LD ”)”.

  As shown in FIG. 15B, the wheel 5 is provided in a motor 50 and is rotated at a high speed.

  As shown in FIG. 15C, the wheel 5 is divided into three portions 5R, 5G, and 5B. The portion 5B is a reflecting surface that reflects blue light emitted from the light source of the light source device 10.

  The portion 5R is a light shielding portion. The portion 5G is light transmissive.

  The wheel 5 is inclined by 45 degrees with respect to the optical axis of the condensing lens, and as shown in FIG. 15B, the blue laser light from the light source device 10 is reflected by the portion 5B and deflected by 90 degrees.

  The wheel 5 can be formed, for example, by forming a reflective film on the portion 5B of the circular transparent glass plate by vapor deposition or the like and forming a light shielding film on the portion 5R by vapor deposition or the like.

  An antireflection film is preferably formed on the portion 5R.

  When the laser light from the light source device 10 enters the portion 5G of the wheel 5, the laser light passes through the wheel and travels straight. Moreover, when it injects into the part 5B, it will reflect.

  When entering the portion 5R, it is shielded from light.

  A “multi-primary light source device” shown in FIG. 15 includes a light source 20 and a light source 30 that emit light having a wavelength different from that of the light source (blue LD) of the light source device 10 together with the light source device 10 for the condensed light flux.

  In FIG. 15, reference numerals LN1 to LN6 denote lenses, and reference signs DM1 to DM3 denote dichroic mirrors. Reference numeral 40 denotes a “light tunnel”.

  The dichroic mirror DM1 “transmits blue light and reflects green light”. The dichroic mirror DM2 “transmits red light and reflects green light”.

  The dichroic mirror DM3 “transmits blue light and reflects red light and green light”.

  When the plurality of blue LDs of the light source device 10 emit light, the blue laser light from each blue LD is condensed on the wheel 5.

  The blue laser light sequentially enters the portions 5B, 5G, and 5R of the wheel 5.

  The blue laser light incident on the portion 5B is reflected and enters the light tunnel 40 through the lens NL2, the dichroic mirror DM3, and the lens LN6 as laser light LB.

  Since the light reflected by the wheel 5 is divergent, the divergent property of the laser light LB is suppressed by the lens LN2, and further condensed at the entrance of the light tunnel 40 by the lens LN6.

  The blue laser light incident on the portion 5G of the wheel 5 is transmitted and enters the light source 20 through the lens LN1, the dichroic mirror DM1, and the lens LN3 as laser light LB.

  Since the laser beam LB transmitted through the wheel 5 is also divergent, the divergent property is suppressed by the lens LN1 and further condensed on the light source 20 by the lens LN3.

  The light source 20 is a “green phosphor” and is excited by the focused laser beam LB to emit green fluorescence LG.

  The green fluorescence LG is incident on the dichroic mirror DM1 through the lens LN3 and reflected.

  The reflected fluorescence LG is sequentially reflected by DM2 and DM3, and collected at the entrance of the light tunnel 40 by the lens LN6.

  The light source 30 is a red LED that emits red light LR, and emits light at a timing when the blue laser light enters the portion 5R of the wheel 5 and is blocked.

  The red light LR is suppressed in divergence by the lens LN5, passes through the dichroic mirror DM2, is reflected by the dichroic mirror DM3, and enters the lens LN6.

  Then, the light is condensed at the entrance of the light tunnel 40 by the lens LN6.

  In this way, the blue laser light LB, the green fluorescence LG, and the red light LR enter the light tunnel 40 while sequentially switching.

  The illuminance of the laser light LB, the fluorescence LG, and the red light LR sequentially incident on the light tunnel 40 is made uniform by reflection many times inside the light tunnel 40.

  Then, the light of each color emitted from the light tunnel 40 is guided to the light valve of the image projection device, and illuminates the image displayed on the light valve.

  FIG. 16 is a diagram showing an embodiment of an image projection apparatus using the “light source device for multi-primary colors” of FIG. The same parts as those in FIG. 15 are denoted by the same reference numerals as those in FIG.

  As described with reference to FIG. 15, light of each color is sequentially emitted from the light tunnel 40.

  As shown in FIG. 16, the light emitted from the light tunnel 40 passes through the relay lens LL, is sequentially reflected by the two folding mirrors ML1 and ML2, and travels toward the light valve 50.

  The folding mirror ML1 is a plane mirror, and the folding mirror ML2 is a “spherical mirror”.

  The light valve 50 is a DMD (Digital micromirror device), and displays an image by individually controlling the inclination of the two-dimensionally arranged micromirrors.

  The displayed image is a color separation image of three primary colors: R (red), G (green), and B (blue) of a color projection image projected on a screen (not shown).

  These three color separation images are switched in accordance with the timing at which the light bulb 50 is irradiated with the corresponding color light.

  The light of each color reflected by the light valve 50 is enlarged and projected on a screen (not shown) by the projection imaging lens 60.

  When the projected images of the three primary colors: R, G, and B are sequentially switched to light beams on the screen, the observer visually recognizes the enlarged color image.

  The light source device described in the embodiment with reference to FIGS. 1 to 3 is “a light source / lens pair composed of one light source 2 and one positive lens 3 disposed opposite to the light source 2”. Multiple pairs.

  The positive lens 3 in the light source / lens pair has a shape that is long in one direction.

  The plurality of light source / lens pairs are arranged in a predetermined arrangement so that at least the lens sides along the longitudinal direction of the positive lens 3 in each pair are adjacent to each other.

  The light source 3 in each light source / lens pair is a semiconductor light source (LD) that emits light having an elliptical light beam cross-sectional shape.

  The semiconductor light source (LD) is adjusted in position so that the major axis direction (A direction) of the elliptical shape is the longitudinal direction of the positive lens 3 with respect to the positive lens 3 arranged to face the light source.

  The plural pairs of light source / lens pairs are arranged in a single or more circular shape so that the longitudinal direction of the lens is directed toward the arrangement center 0.

  In the embodiment shown in FIG. 4, the positive lens 3 </ b> A in the light source / lens pair has a non-parallel linear shape in which two sides along the longitudinal direction narrow toward the arrangement center 0.

  In the embodiment shown in FIGS. 5 and 6, the plurality of pairs of light source / lens pairs are arranged in a double concentric shape so that the longitudinal direction of the lens is directed toward the arrangement center 0. .

  The positive lenses 3B and 3C of the embodiment shown in FIG. 6 are formed so that the lens length direction is smaller than that of the lenses 3 and 3A.

  In the embodiment of FIG. 7, in each light source / lens pair, the position of the light source 2 is shifted from the optical axis position of the positive lens 3 in a direction away from the longitudinal center 0 of the positive lens 3. .

  In each of the embodiments described above, the positive lenses 3, 3A, 3B, and 3C in each light source / lens pair are collimator lenses.

  Then, it is a “focused light source device” having a condensing lens 4 that condenses a light beam group that has passed through positive lenses of a plurality of light source / lens pairs on a common light condensing unit.

  In addition, the “multi-primary light source device” shown in FIG. 15 includes light sources 20 and 30 that emit light having a wavelength different from that of the light source of the focused light source device 10 together with the focused light source device 10.

  The image projection apparatus shown in FIG. 16 is an image projection apparatus using the multi-primary color light source apparatus shown in FIG.

1 Holder
2 Light source
3 Positive lens
4 condenser lens
5 Wheel

JP 2012-48832 A JP 2012-215633 A

Claims (8)

Having a plurality of light source / lens pairs of one light source and one lens arranged opposite to the light source,
The lens in the light source / lens pair has a long shape in one direction,
The plurality of light source / lens pairs are arranged in a predetermined arrangement so that at least lens sides along the longitudinal direction of the lenses in each pair are adjacent to each other. The light source device according to claim 1,
The light source in each light source / lens pair is a semiconductor light source that emits light having an elliptical light beam cross-sectional shape. The position is adjusted to be in the direction,
The light source device, wherein the plurality of pairs of light source / lens pairs are arranged in a single or more circular shape such that the longitudinal direction of the lens is directed toward the arrangement center. The light source device according to claim 2,
The lens in the light source / lens pair is a non-parallel straight line in which two sides along the longitudinal direction narrow toward the center of the arrangement. The light source device according to claim 2 or 3,
In each light source / lens pair, the light source position is shifted with respect to the optical axis position of the lens in a direction away from the arrangement center in the longitudinal direction of the lens. The light source device according to any one of claims 2 to 4,
A light source device, wherein a lens in each light source / lens pair is a collimator lens. The light source device according to any one of claims 2 to 5,
A light source device for a focused light beam, comprising a condensing lens that condenses a light beam group that has passed through a plurality of light source / lens pairs on a common light condensing unit.   7. A multi-primary light source device comprising: a light source device for a focused light beam according to claim 6; and one or more light sources that emit light having a wavelength different from the light source of the light source device for the focused light beam.   An image projection apparatus using the multi-primary color light source device according to claim 7.

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