JP2016197600A - Light source device and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device and an image display device capable of achieving high luminance while suppressing increase in size of the device.SOLUTION: A light source device includes one or more solid light sources, a first optical system, an emission part and a second optical system. The one or more solid light sources emit light in a predetermined wavelength region. The first optical system has at least one aspherical surface for making luminous fluxes from the one or more solid light sources substantially parallel fluxes. The emission part has one or more luminous bodies for emitting visible light in a longer wavelength region than wavelength of the light by being excited by the light from the one or more solid light sources, and it can emit the light including the light in the predetermined wavelength region and the visible light from the one or more luminous bodies as emission light. The second optical system has at least one concave reflection surface, and it condenses light to the one or more luminous bodies which the emission part has by reflecting the light from the one or more solid light sources which has been made substantially parallel fluxes by the first optical system by the concave reflection surface.SELECTED DRAWING: Figure 2

Description

  The present technology relates to a light source device and an image display device using the light source device.

  Recently, an increasing number of products adopt solid light sources such as LEDs (Light Emitting Diodes) and LDs (Laser Diodes) instead of conventional mercury lamps or xenon lamps as light sources used for projectors for presentations or digital cinema. Yes. A fixed light source such as an LED has a long life and does not require replacement of a conventional lamp, and has an advantage that it is turned on immediately after the power is turned on.

  As such a projector, there is a type in which a solid light source such as an LED is directly used as a light source. On the other hand, there is a type in which a light emitter such as a phosphor that emits light when excited by excitation light is used as a light source. In this case, the solid light source is used as an excitation light source that emits excitation light.

  For example, Patent Document 1 proposes an optical system that condenses a collimated laser light source on a phosphor with a convex lens (see paragraph [0014] FIG. 1 of Patent Document 1). Patent Document 2 proposes an optical system having a stepped mirror and a convex lens. In this optical system, the interval between the light beams from the plurality of light sources is narrowed by the stepped mirror. Then, light is collected on the phosphor by the convex lens (see paragraph [0052] FIG. 1 of Patent Document 2).

  Further, Patent Document 3 proposes an optical system that uses a condensing optical system instead of a convex lens in order to condense light from a plurality of light sources in a small space. This condensing optical system is composed of a small lens assembly in which a plurality of small lenses each having a flat incident surface and an aspherical convex surface are disposed. The incident surface of the condensing optical system is a continuous surface, and the exit surface of the condensing optical system is provided with a step so that the center side thereof is largely retracted along the optical axis of the light source device (Patent Document). 3 paragraph [0038] see FIG. 4 etc.).

JP 2012-8303 A JP 2012-37681 A JP 2012-58638 A

  In the optical system described in Patent Literatures 1-3, when the number of light sources is increased to increase the brightness, the above-described convex lens, stepped mirror, and condensing optical system must be enlarged. As a result, the size of the apparatus is increased.

  For example, in the optical system described in Patent Document 1, a large lens is required when the width of the light beam from the laser light source increases. In addition, it is necessary to dispose a lens at a position away from the laser light source. As a result, the apparatus becomes large in the optical axis direction and the radial direction.

  In the optical system described in Patent Document 2, the interval between the optical axes incident on the convex lens can be narrowed by the step-like mirror. However, the area of the mirror itself must be increased, which increases the size of the apparatus.

  When the condensing optical system described in Patent Document 3 is used, it may be possible to reduce the size compared to the convex lens described in Patent Document 1. However, as the number of light sources increases, it is unavoidable that the area of the incident surface increases, and the apparatus also becomes larger.

  In view of the circumstances as described above, an object of the present technology is to provide a light source device and an image display device that can achieve high luminance while suppressing an increase in size of the device.

In order to achieve the above object, a light source device according to an aspect of the present technology includes one or more solid-state light sources, a first optical system, an emitting unit, and a second optical system.
The one or more solid light sources emit light in a predetermined wavelength region.
The first optical system has at least one aspherical surface that converts a light beam from the one or more solid-state light sources into a substantially parallel light beam.
The emitting portion includes one or more light emitters that are excited by light from the one or more solid light sources to emit visible light having a wavelength longer than the wavelength of the light, and the light in the predetermined wavelength region and the 1 Light including visible light from the above light emitter can be emitted as emitted light.
The second optical system has at least one concave reflecting surface, and reflects the light from the one or more solid light sources that has been made the substantially parallel light beam by the first optical system by the concave reflecting surface. Then, the light is condensed on the one or more light emitters included in the emission part.

  In this light source device, a light beam from one or more solid light sources is made into a substantially parallel light beam by a first optical system having at least one aspherical surface. Then, the substantially parallel light beam is reflected by at least one concave reflecting surface of the second optical system, and is condensed on one or more light emitters of the emitting portion. From the emitting part, light including light in a predetermined wavelength range from the solid light source and visible light from the light emitter is emitted. As described above, the use of the concave reflecting surface for condensing light to the light emitter makes it possible to make the light source device compact. For example, the size of the second optical system can be suppressed even when the number of solid-state light sources is increased to increase the luminance. As a result, it is possible to achieve high brightness while suppressing an increase in size of the apparatus.

The first and second optical systems may each have a focal length that satisfies the following expression.
1 <f2 / f1 <80
f1: Focal length of the first optical system f2: Focal length of the second optical system By setting the focal length of the first optical system and the focal length of the second optical system so as to satisfy the above equation It is possible to suppress the occurrence of deviation in the position of the light condensed by the second optical system.

The at least one concave reflecting surface may be a rotationally symmetric aspherical surface that satisfies the following formula.
-1.5 <Km <-0.5
Km: Conic constant of the concave reflecting surface By setting the concave reflecting surface that is a rotationally symmetric aspherical surface so as to satisfy the above formula, the accuracy of light collection by the second optical system can be improved.

  The at least one concave reflecting surface may be a free-form surface having no rotational symmetry axis.

The second optical system may include an optical member that guides light from the one or more solid light sources reflected by the concave reflecting surface to the light emitter.
By providing such a light source member, the degree of freedom regarding the design of the second optical system can be increased. As a result, the light source device can be reduced in size.

The optical member may have a focal length that satisfies the following formula.
−200 <f2 / fm <200
f2: Focal length of the second optical system fm: Focal length of the optical member By setting the focal length of the optical member so as to satisfy the above formula, the accuracy of light collection by the second optical system is improved. Can do.

The optical member is a lens and may have a focal length that satisfies the following expression.
−100 <fM / fm <100
fM: the focal length of the concave reflecting surface fm: the focal length of the lens By setting the focal length of the lens as the optical member so as to satisfy the above formula, the accuracy of light collection by the second optical system is improved. Can do.

The optical member has a concave reflection surface included in the first optical system as a first concave reflection surface, has a second concave reflection surface different from the first concave reflection surface, and satisfies the following expression: It may have a focal length.
0.5 <fM / fm <50
fM: focal length of the first concave reflecting surface fm: focal length of the optical member By setting the focal length of the optical member having the second concave reflecting surface to satisfy the above formula, the second optical system It is possible to improve the accuracy of light collection.

The optical member may have a convex reflecting surface and have a focal length that satisfies the following formula.
−50 <fM / fm <−0.5
fM: focal length of the concave reflecting surface fm: focal length of the optical member By setting the focal length of the optical member having the convex reflecting surface so as to satisfy the above formula, the accuracy of light collection by the second optical system can be improved. Can be improved.

  The optical member may have a plane reflecting surface that reflects light from the one or more solid light sources reflected by the concave reflecting surface to the light emitter.

The plane reflecting surface is defined by the following equation, assuming that the state parallel to the arrangement surface on which the light emitter is disposed is 0 °, and the rotational direction from the state toward the concave reflecting surface is positive about a predetermined rotation axis. You may arrange | position with the rotation angle which fills.
0 ° <Am <60 °
Am: Rotation angle of the plane reflecting surface By arranging the plane reflecting surface so as to satisfy the above formula, the second optical system can be appropriately downsized.

A plurality of condensing optical systems each including the first and second optical systems may be arranged symmetrically with a predetermined reference axis with respect to the position of the light emitter.
As a result, it is possible to increase the brightness of the light emitted from the light emitting portion.

The second optical system may include an optical member that guides light from the one or more solid light sources reflected by the concave reflecting surface to the light emitter. In this case, the light source device may further include an adjustment mechanism that adjusts the arrangement of the optical members included in each of the condensing optical systems.
By providing such an adjustment mechanism, a plurality of condensing optical systems can be easily arranged.

The emitting portion may include a rotating wheel that rotates about a predetermined rotation axis that includes an arrangement surface on which the light emitter is arranged and extends in a direction perpendicular to the arrangement surface. In this case, the second optical system is configured to emit light from the first optical system at a plurality of positions on the light emitting body arranged on the arrangement surface of the rotating wheel at different distances from the rotation axis. May be condensed.
Thereby, deterioration of the phosphor can be suppressed.

The light source device may further include a third optical system that can change the light beam of the emitted light emitted from the emission unit into a substantially parallel light beam and has a variable focal length.
As a result, it becomes possible to efficiently guide the light emitted from the light emitting portion to an external system or the like.

An image display device according to an embodiment of the present technology includes a light source device, an image generation system, and a projection system.
The light source device includes one or more solid light sources, a first optical system, an emitting unit, and a second optical system.
The one or more solid light sources emit light in a predetermined wavelength region.
The first optical system has at least one aspherical surface that converts a light beam from the one or more solid-state light sources into a substantially parallel light beam.
The emitting portion includes one or more light emitters that are excited by light from the one or more solid light sources to emit visible light having a wavelength longer than the wavelength of the light, and the light in the predetermined wavelength region and the 1 Light including visible light from the above light emitter can be emitted as emitted light.
The second optical system has at least one concave reflecting surface, and reflects the light from the one or more solid light sources that has been made the substantially parallel light beam by the first optical system by the concave reflecting surface. Then, the light is condensed on the one or more light emitters included in the emission part.
The image generation system includes an image generation element and an illumination optical system.
The image generation element generates an image based on the irradiated light.
The illumination optical system irradiates the image generation element with light emitted from the light source device.
The projection system projects an image generated by the image generation element.

  As described above, it is an object of the present technology to provide a light source device and an image display device that can achieve high luminance while suppressing an increase in size of the device.

It is a figure showing an example of schematic structure of a light source device concerning a 1st embodiment of this art. It is a schematic diagram which shows the structural example of the 1st light source part shown in FIG. 1, and the optical path of a laser beam. It is a mimetic diagram showing an example of a reflective member concerning this art. It is a mimetic diagram showing an example of a reflective member concerning this art. It is a figure which shows the structure of the 1st light source part which concerns on 1st Embodiment. It is a figure which shows the structure of the 1st light source part which concerns on 1st Embodiment. It is a figure which shows the number and arrangement position of the several laser light source which concerns on 1st Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 1st Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 1st Embodiment. It is a schematic diagram for demonstrating the shift | offset | difference of a condensing point. It is a figure showing the composition of the 1st light source part concerning a 2nd embodiment of this art. It is a figure which shows the structure of the 1st light source part which concerns on 2nd Embodiment. It is a figure which shows the number and arrangement position of the several laser light source which concerns on 2nd Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 2nd Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 2nd Embodiment. It is a figure which shows the structural example at the time of using two 1st light source parts shown in FIG. It is a figure showing the composition of the 1st light source part concerning a 3rd embodiment of this art. It is a figure which shows the structure of the 1st light source part which concerns on 3rd Embodiment. It is a figure which shows the number and arrangement position of the several laser light source which concerns on 3rd Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 3rd Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 3rd Embodiment. It is a figure showing the composition of the 1st light source part concerning a 4th embodiment of this art. It is a figure which shows the structure of the 1st light source part which concerns on 4th Embodiment. It is a figure which shows the number and arrangement position of the several laser light source which concerns on 4th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 4th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 4th Embodiment. It is a figure which shows the structural example at the time of using two 1st light source parts shown in FIG. It is a figure showing the composition of the 1st light source part concerning a 5th embodiment of this art. It is a figure which shows the structure of the 1st light source part which concerns on 5th Embodiment. It is a figure which shows the number and arrangement position of the several laser light source which concerns on 5th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 5th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 5th Embodiment. It is a figure showing the composition of the 1st light source part concerning a 6th embodiment of this art. It is a figure which shows the structure of the 1st light source part which concerns on 6th Embodiment. It is a figure which shows the number and arrangement position of the several laser light source which concerns on 6th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 6th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 6th Embodiment. It is a figure showing the composition of the 1st light source part concerning a 7th embodiment of this art. It is a figure which shows the structure of the 1st light source part which concerns on 7th Embodiment. It is a figure which shows the number and arrangement position of the several laser light source which concerns on 7th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 7th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 7th Embodiment. It is a figure which shows the structural example at the time of using two 1st light source parts shown in FIG. It is a figure showing the composition of the 1st light source part concerning an 8th embodiment of this art. It is a figure which shows the structure of the 1st light source part which concerns on 8th Embodiment. It is a figure which shows the number and arrangement position of the several laser light source which concerns on 8th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 8th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 8th Embodiment. It is a figure showing the composition of the 1st light source part concerning a 9th embodiment of this art. It is a figure which shows the structure of the 1st light source part which concerns on 9th Embodiment. It is a figure which shows the number and arrangement position of the several laser light source which concerns on 9th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 9th Embodiment. It is a table | surface which shows each data regarding the 1st light source part which concerns on 9th Embodiment. It is a table | surface which shows the data in 1st Embodiment to 9th Embodiment. It is a figure showing the composition of the 1st light source part concerning a 10th embodiment of this art. It is a figure for demonstrating the position of the condensing point which concerns on 10th Embodiment. It is a figure which shows the structure of the light source device which concerns on 11th Embodiment of this technique. It is a typical figure showing an example of composition of a projector as an image display device concerning this art. It is a schematic diagram which shows the other structural example of the projector which concerns on this technique. It is a schematic diagram which shows the other structural example of the projector which concerns on this technique.

  Hereinafter, embodiments according to the present technology will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a diagram illustrating a schematic configuration example of a light source device according to the first embodiment of the present technology. The light source device 100 is for a projector of a type that emits white light by combining light in a blue wavelength region and light in a red wavelength region that is generated from a fluorescent material excited by the laser light and in a green wavelength region. It is a light source device.

  The light source device 100 includes a first light source unit 10 and a second light source unit 50. The first light source unit 10 includes a plurality of laser light sources 5 and a first and a second for condensing the light emitted from the plurality of laser light sources 5 on the phosphor layer 51 included in the second light source unit 50. Optical systems 11 and 12.

  The plurality of laser light sources 5 are blue laser light sources capable of oscillating blue laser light B1 having a peak wavelength of emission intensity within a wavelength range of 400 nm to 500 nm, for example. The plurality of laser light sources 5 correspond to one or more solid light sources that emit light in a predetermined wavelength region. Other light sources such as LEDs may be used as the solid light source. Further, the light in the predetermined wavelength region is not limited to the blue laser light B1.

  The first optical system 11 has at least one aspherical surface that makes the light beams of the blue laser light B1 emitted from the plurality of laser light sources 5 substantially parallel. The second optical system 12 has at least one concave reflecting surface, and reflects the blue laser light B1 from the plurality of laser light sources 5 made into a substantially parallel light beam by the first optical system 11 by the concave reflecting surface. Thus, the light is condensed on one or more phosphors 51 included in the second light source unit 50. The first and second optical systems 11 and 12 will be described in detail later.

  The second light source unit 50 corresponds to an emission unit and includes a phosphor wheel 52. The phosphor wheel 52 includes a disk-shaped substrate 53 that transmits the blue laser light B <b> 1 and a phosphor layer 51 provided on the substrate 53. A motor 54 for driving the phosphor wheel 52 is connected to the center of the substrate 53, and the phosphor wheel 52 has a rotation axis 55 at a normal line passing through the center of the substrate 53, and can rotate around the rotation axis 55. Is provided.

  The phosphor wheel 52 includes a rotation wheel 57 that includes an arrangement surface 56 on which the phosphor layer 51 as a light emitter is arranged and rotates around a predetermined rotation axis extending in a direction perpendicular to the arrangement surface 56. A rotation shaft 55 shown in FIG. 1 corresponds to a predetermined rotation shaft extending in a direction perpendicular to the arrangement surface 56. The phosphor wheel 51 is disposed on the rotating wheel 57 as the phosphor wheel 52.

  The phosphor layer 51 corresponds to one or more light emitters that are excited by light from the plurality of laser light sources 5 and emit visible light having a longer wavelength range than the wavelength of the light. In the present embodiment, the phosphor layer 51 includes a fluorescent material that emits fluorescence when excited by the blue laser light B1 having a center wavelength of about 445 nm. The phosphor layer 51 converts part of the blue laser light B1 emitted from the plurality of laser light sources 5 into light in a wavelength region including the red wavelength region or the green wavelength region (that is, yellow light) and emits the light.

  For example, a YAG (yttrium / aluminum / garnet) phosphor is used as the phosphor contained in the phosphor layer 51. In addition, the kind of fluorescent substance, the wavelength range of the excited light, and the wavelength range of the visible light generated by excitation are not limited.

  In addition, the phosphor layer 51 absorbs a part of the excitation light, and transmits a part of the excitation light, whereby the blue laser light B1 emitted from the plurality of laser light sources 5 can also be emitted. Thereby, the light emitted from the phosphor layer 51 becomes white light due to the color mixture of the blue excitation light and the yellow fluorescence. Thus, in order to transmit a part of excitation light, the fluorescent substance layer 51 may contain the filler particle | grains which are the particulate substances which have a light transmittance, for example.

  As shown in FIG. 1, the phosphor wheel 52 is configured such that, of the two main surfaces of the substrate 53, the main surface 58 on the side where the phosphor layer 51 is not provided is directed to the first light source unit 10 side. Has been placed. The phosphor wheel 52 is disposed so that the focal position of the blue laser light B1 collected by the first light source unit 10 coincides with a predetermined position on the phosphor layer 51.

  When the substrate 53 is rotated by the motor 54, the laser light source 5 irradiates the phosphor layer 51 with excitation light while relatively moving the irradiation position on the phosphor layer 51. As a result, the second light source unit 50 emits the blue laser light B2 that has passed through the phosphor layer 51 and light including green light G2 and red light R2 that are visible light from the phosphor layer 51 as emitted light. . By rotating the phosphor wheel 52, it is possible to avoid deterioration caused by irradiating the same position on the phosphor layer 51 with excitation light for a long time.

  FIG. 2 is a schematic diagram illustrating a configuration example of the first light source unit 10 illustrated in FIG. 1 and an optical path of the laser beam B1. The first light source unit 10 includes a plurality of laser light sources 5 and a plurality of collimator lenses 15 that convert light beams from the laser light sources 5 into substantially parallel light beams. Further, the first light source unit 10 includes a reflecting member 20 that reflects the blue laser light B <b> 1 made into a substantially parallel light beam by the collimator lens 15 to a predetermined condensing point 60 on the phosphor layer 51. The reflecting member 20 has a concave reflecting surface 21, and the blue laser light B 1 is reflected by the concave reflecting surface 21, thereby condensing the blue laser light B 1 on the condensing point 60. As the reflecting member 20, for example, a reflecting mirror is used.

  The collimator lens 15 provided in each laser light source 5 is a rotationally symmetric aspheric lens. The aspheric surfaces of the plurality of collimator lenses 15 correspond to at least one aspheric surface included in the first optical system 11. In the present embodiment, one collimator lens 15 is installed in each laser light source 5, but the present invention is not limited to this. For example, light beams from a predetermined number of laser light sources 5 may be collectively made into a substantially parallel light beam by one aspheric lens. A lens having an aspherical surface that is not rotationally symmetric may be used as long as the light beam from the laser light source 5 can be made into a substantially parallel light beam.

  3 and 4 are schematic diagrams illustrating an example of the reflecting member 20. The reflecting member 20 is included in the second optical system 12 and has a concave reflecting surface 21. The concave reflecting surface 21 may be a rotationally symmetric aspherical surface or a free-form surface having no rotationally symmetric axis. The shape of the concave reflecting surface 21 is appropriately set based on the position of the plurality of laser light sources 5, the position of the condensing point 60, the size of the light beam of the laser beam B1 incident on the concave reflecting surface 21, the incident angle, and the like.

  FIG. 4 is a view of the reflecting member 20 as viewed from the back surface 22 side opposite to the concave reflecting surface 21. FIG. 4 is a cross-sectional view of the reflecting member 20 in a direction substantially orthogonal to each other. As shown in FIG. 4, the reflection member 20 has a substantially rectangular outer shape when viewed from the back surface 22 side (hereinafter, the external shape viewed from the back surface side 22 is simply referred to as an external shape). The reflecting member 20 has a cross-sectional shape along the shape of the concave reflecting surface 21.

  For example, the outer shape of the reflecting member 20 can be changed as appropriate in accordance with the size of the irradiation region of the blue laser light B <b> 1 made into a substantially parallel light beam by the first optical system 11. For example, as shown in FIG. 4, a substantially rectangular reflecting member 20 may be used, or a triangular or other polygonal reflecting member 20 may be used. Thereby, the outer shape of the reflecting member 20 can be appropriately adjusted and reduced as compared with the case where a condensing lens is used to condense light from the plurality of laser light sources 5.

  For example, it is assumed that the blue laser beam B1 is irradiated over the entire concave reflecting surface 21 of the reflecting member 20 shown in FIG. In this case, if the blue laser light B1 is to be collected using a condensing lens, a lens having a size that includes at least the outer shape of the reflecting member 20 (see a broken-line circle G) is required. Moreover, the thickness (refer sectional drawing) of the reflection member 20 can also be made smaller than the case where a condensing lens is used. As a result, the second optical system 12 can be made compact, and an increase in the size of the light source device 100 can be suppressed. It is also clear from the optical system of the telescope that a reflecting surface having a parabolic shape is generally suitable for a small condensing optical system rather than a refractive system using a lens.

  The concave reflecting surface 21 is typically a mirror surface, and the blue laser beam B1 is reflected and condensed by the mirror surface 51 to the phosphor layer 51. The material of the reflection member 20 is not limited, for example, a metal material, glass, etc. are used.

  Hereinafter, a detailed example of the first light source unit 10 will be described. 5 to 9 are diagrams for explaining the embodiment.

  5 and 6 are diagrams showing the configuration of the first light source unit 10. FIG. 6 is a view of the first light source unit 10 shown in FIG. 5 as viewed from the back side of the plurality of laser light sources 5 toward the reflecting member 20.

  As shown in FIGS. 5 and 6, the light beams from the plurality of laser light sources 5 are made into substantially parallel light beams by the collimator lens 15 provided in each laser light source 5. The blue laser light B <b> 1 that has been converted into a substantially parallel light beam is reflected by the concave reflecting surface 21 of the reflecting member 20, thereby being condensed at a predetermined condensing point 60 on the phosphor layer 51.

  FIG. 7 is a diagram showing the number and arrangement positions of a plurality of laser light sources 5. The xyz coordinates shown in FIG. 7 are coordinates corresponding to the xyz coordinates shown in FIG. As shown in FIG. 7, in this embodiment, as the plurality of laser light sources 5, a total of 28 laser light source arrays are arranged in a row along the x-axis direction and seven along the y-axis direction. The number of laser light sources 5 is not limited.

  The distance between the laser light sources 5 in the x-axis direction and the y-axis direction is 11 mm. The beam diameter of the substantially parallel beam laser beam B1 emitted from the collimator lens 15 is 6 mm. Therefore, the blue laser beam B1 having a substantially parallel light beam is irradiated toward the concave reflecting surface 21 within a range of 39 mm in the x-axis direction and 72 mm in the y-axis direction. The origin at which the x axis and the y axis intersect is the optical axis of the second optical system 12.

  8 and 9 are tables showing respective data relating to the first light source unit 10. The object-side NA in the table is the numerical aperture of the collimator lens 15 for the blue laser light B1 from each laser light source 5. The focal length f1 of the first optical system is the focal length of the collimator lens 15 (unit: mm). The focal length f2 of the second optical system is the focal length of the concave reflecting surface 21 of the reflecting member 20 (unit: mm).

  The first optical surface of the first optical system 11 corresponds to the array start surface, and corresponds to the emission surfaces of the 28 laser light sources 5. The surface S1 is a light source side surface of the cover glass 7 that covers the laser light source 5 (see FIG. 5). The surface S2 is the surface on the opposite side of the cover glass 7, that is, the surface on the side from which the laser beam B1 is emitted. The surface S3 is a plane of the collimator lens 15 on the laser light source 5 side. The surface S4 is an aspheric surface of the collimator lens 15, and this surface is the final array surface. The surfaces up to the surface S4 are surfaces included in the first optical system 11.

  The surface S5 is included in the second optical system 12. The surface S5 is the concave reflecting surface 21 of the reflecting member 20. In the present embodiment, the concave reflecting surface 21 is an aspherical surface. The surface S6 is a surface 58 opposite to the arrangement surface 56 on which the phosphor layer 51 is disposed. The surface S6 is set as an eccentric surface that is eccentric with respect to the xy plane composed of the x-axis and the y-axis in FIG. This setting is performed in order that the light at the substantially center of the light beam of the blue laser light B1 reflected by the concave reflecting surface 21 enters the phosphor layer 51 substantially vertically. The second light source surface of the second optical system 12 is the surface of the phosphor layer 51 on the side on which the blue laser light B1 is incident.

  In the table of FIG. 8, the radius of curvature (mm) of each surface, the distance (mm) between the surfaces, and the refractive index n for blue laser light having a wavelength of 445 nm are described. The radius of curvature and the interval are described with positive and negative signs with reference to the z axis shown in the figure. Note that the curvature radius being infinite means that the surface is a plane. The refractive index n is described for the substrate 53 having the cover glass 7, the collimator lens 15, and the mounting surface 56.

  FIG. 9 shows data on the aspheric surfaces of the surfaces S4 and S5 and data on the eccentricity setting of the surface S6. In the present embodiment, an aspheric surface is represented by the following expression. In the equation, c is a curvature, K is a conic constant, and Ai is a correction coefficient.

  The aspheric surface S4 of the collimator lens 15 is represented by substituting the conic constant K and the correction coefficient Ai shown in FIG. 9 into the above formula. Further, the curvature c is obtained from the curvature radius of FIG. The concave reflecting surface S5 is a paraboloid with a conic constant K of -1. The eccentric surface S6 is eccentric by 40 ° in the y-axis clockwise direction and −2.0 mm in the x-axis direction with respect to the xy plane.

Here, the focal length f1 of the first optical system 11 and the focal length f2 of the second optical system 12 were considered. As a result, it is desirable that the focal lengths of the first and second optical systems 11 and 12 satisfy the following conditional expression (1).
1 <f2 / f1 <80 (1)
f1: Focal length of the first optical system f2: Focal length of the second optical system

  Conditional expression (1) appropriately defines the focal length f2 of the second optical system with respect to the focal length f1 of the first optical system. Here, a case where the upper limit is not satisfied in the conditional expression (1), that is, a case where f2 / f1 <80 is not satisfied is considered. In this case, it is assumed that the relative position between the laser light source 5 and the collimator lens 15 is shifted when the first optical system 11 is assembled. Then, the point 60 where the blue laser beam B1 is collected in the second optical system 12 is greatly deviated from the intended point.

  FIG. 10 is a schematic diagram for explaining the deviation of the condensing point 60. In FIG. 10, the first optical system 11 is schematically represented as an optical system having a lens F1 having a focal length f1. Similarly, the second optical system 12 is schematically represented as an optical system having a lens F2 having a focal length f2.

In FIG. 10, Ycol represents a relative deviation between the laser light source 5 and the collimator lens 15. Ycon represents the deviation of the condensing point 60. As shown in FIG. 10, when Ycol occurs, the light beam emitted from the lens F1 is tilted by an angle θ. Using this angle θ, Ycol and Ycon are expressed by the following equations.
Ycol = f1 × tan θ
Ycon = f2 × tan θ

From these two equations, the following equation (A) is established for Ycol and Ycon.
Ycon = (f2 / f1) × Ycol (A)
That is, the deviation of the condensing point 60 in the second optical system 12 is proportional to the ratio of the focal length f2 to the focal length f1. Therefore, if the value of f2 / f1 becomes larger than the upper limit of the conditional expression (1), the deviation of the condensing point 60 is greatly shifted. As a result, for example, when assembly variation or the like occurs in each of the plurality of laser light sources 5, it is difficult to focus the blue laser light B1 from each laser light source 5 on one place.

  On the other hand, when the lower limit of the conditional expression (1) is not satisfied, the second optical system 12 is extremely downsized and the system is not established. From the above consideration, it has been found that when f2 / f1 satisfies the conditional expression (1), the occurrence of the deviation of the condensing point 60 can be suppressed. The lower limit value and the upper limit value of conditional expression (1) are values found as values that define an effective range, but the effective range of f2 / f1 can be changed depending on various conditions, for example. For example, it is conceivable that a smaller range included in the range represented by the conditional expression (1) is established as an effective range. Note that the consideration regarding the conditional expression (1) also applies to an optical system in which a condenser lens is desired.

The concave reflecting surface 21 of the second optical system 12 was also considered. As a result, it is desirable that the concave reflecting surface 21 is composed of a rotationally symmetric aspheric surface and the conic constant satisfies the following conditional expression (2).
-1.5 <Km <-0.5 (2)
Km: Conic constant of the concave reflecting surface

  When the concave reflecting surface 21 formed of a rotationally symmetric aspherical surface does not satisfy the conditional expression (2), the blue laser light B1 from the plurality of laser light sources 5 may be condensed at one condensing point 60. The possibility of becoming difficult was found. In other words, when the conditional expression (2) is satisfied, the blue laser beam B1 can be focused on the intended focusing point 60 with high accuracy.

  As described above, the concave reflecting surface 21 can also be configured by a free curved surface that does not have a rotational symmetry axis.

  As described above, in the light source device 100 according to the present embodiment, the light beams from the plurality of laser light sources 5 are made substantially parallel light beams by the first optical system 11 having at least one aspheric surface. Then, the blue laser beam B <b> 1 having a substantially parallel light beam is reflected by at least one concave reflecting surface 21 included in the second optical system 12 and is condensed on the phosphor layer 51 of the second light source unit 50. From the second light source unit 50, white light including the blue laser light from the laser light source 5 and the visible light of the phosphor layer 51 is emitted. As described above, the concave reflection surface 21 is used for condensing the phosphor layer 51, whereby the light source device 100 can be made compact. For example, even when the number of laser light sources 5 increases to increase the luminance, the size of the second optical system 12 can be suppressed by appropriately setting the shape, the arrangement position, and the like of the concave reflecting surface 21. As a result, it is possible to achieve high brightness while suppressing an increase in size of the light source device 100.

<Second Embodiment>
A light source device according to a second embodiment of the present technology will be described. In the following description, the description of the same components and operations as those of the light source device 100 described in the above embodiment will be omitted or simplified.

  11 to 15 are views for explaining the light source device 200 according to the present embodiment. 11 and 12 are diagrams showing the configuration of the first light source unit 210 according to the present embodiment. FIG. 13 is a diagram showing the number and arrangement positions of a plurality of laser light sources 205. 14 and 15 are tables showing respective data relating to the first light source unit 210.

  As shown in FIGS. 11 and 12, in the present embodiment, the second optical system 212 includes a planar reflecting member 225 having a planar reflecting surface 224. The planar reflecting member 225 corresponds to an optical member that guides light from the plurality of laser light sources 205 reflected by the concave reflecting surface 221 to the phosphor layer 251. The plane reflecting surface 224 of the plane reflecting member 225 reflects the light from the plurality of laser light sources 205 reflected by the concave reflecting surface 221 to the phosphor layer 251. As a result, the blue laser light B <b> 1 emitted from the plurality of laser light sources 205 is condensed at a predetermined condensing point 260 on the phosphor layer 251. FIG. 12 is a view of the first light source unit 210 as viewed obliquely from the back side of the plurality of laser light sources 205.

  As shown in FIG. 13, the present embodiment uses the same 28 laser light source arrays as in the first embodiment. A blue laser beam B1 of a substantially parallel light beam is emitted along the normal direction (z-axis direction) of the surface on which the plurality of laser light sources 205 are arranged. The blue laser beam B1 is reflected by the concave reflecting surface 221 toward the flat reflecting surface 224. And it is condensed on the phosphor layer 251 by being reflected by the plane reflecting surface 224. The arrangement positions of the plurality of laser light sources 205, the reflecting member 220, and the planar reflecting member 225, the shape and angle of each reflecting surface, and the like are set as appropriate within a range where the blue laser light B1 is collected at a predetermined focusing point 260 Is possible.

  In the table of FIG. 14, the focal length f <b> 2 of the second optical system 212 is the focal length of the optical system including the reflecting member 220 and the planar reflecting member 225. However, the focal length of the plane reflecting surface 224 of the plane reflecting member 225 is infinite. Accordingly, the focal length f2 of the second optical system 212 is the focal length of the concave reflecting surface 221.

  Further, S6 set as the eccentric surface is the plane reflecting surface 224 of the plane reflecting member 225. As shown in FIG. 15, the plane reflecting surface 224 is eccentric by 40 ° in the y-axis clockwise direction with respect to the xy plane. The surface S7 is a surface 258 opposite to the arrangement surface 256 on which the phosphor layer 251 is disposed (corresponding to the surface S6 of the first embodiment). In this embodiment, S7 is not rotated but is arranged in parallel with the xy plane and shifted by 14.97 mm in the x-axis direction.

  As described above, the second optical system 212 may include an optical member different from the reflecting member 220. Thereby, the freedom degree regarding the design of the 2nd optical system 212 can be increased, and size reduction of a light source device can be achieved.

In the case where the planar reflecting member 225 is used as the optical member, the arrangement angle of the planar reflecting surface 224 was considered. As a result, a state parallel to the arrangement surface 256 on which the phosphor layer 251 is disposed is defined as 0 °, and a rotational direction from the state toward the concave reflecting surface 221 around a predetermined rotation axis is positive. It is desirable to arrange at a rotation angle satisfying 3).
0 ° <Am <60 ° (3)
Am: rotation angle of the plane reflecting surface

  As shown in FIG. 11, in this embodiment, the state parallel to the xy plane is 0 °. Then, the rotation direction toward the concave reflecting surface 221 is positive with the y axis as the rotation axis. Therefore, it is desirable to arrange the plane reflecting surface 224 at an angle in the range of 0 ° to 60 ° around the y axis.

  Conditional expression (3) can be said to restrict the size reduction of the second optical system 212. It is assumed that the upper limit of conditional expression (3) is not satisfied and the plane reflecting surface 224 is tilted by 60 ° or more about the y axis. In this case, there is a high possibility that the reflected light beam from the concave reflecting surface 221 interferes with the phosphor layer 251. It is assumed that the lower limit of conditional expression (3) is not satisfied and the plane reflecting surface 224 is tilted at an angle of 0 ° or less about the y axis. That is, it is assumed that the lens is tilted from the state parallel to the xy plane to the side opposite to the concave reflecting surface 221. In this case, the distance between the concave reflecting surface 221 and the phosphor layer 251 (the distance in the x-axis direction in FIG. 11) becomes large, and the system becomes large.

  From the above consideration, it has been found that the second optical system can be appropriately downsized when the conditional expression (3) is satisfied. Depending on various conditions, it may be considered that a smaller range included in the range represented by the conditional expression (3) is established as an effective range.

  FIG. 16 is a diagram illustrating a configuration example when two first light source units illustrated in FIG. 11 are used. In the example shown in FIG. 16, the condensing optical system 217 including the first and second optical systems 211 and 212 as one set is disposed at two positions where the axis A passing through the phosphor layer 251 is symmetric. ing. With such a configuration, the number of laser light sources 205 is doubled to 56, and the luminous flux condensed on the phosphor layer 251 increases. As a result, it is possible to increase the brightness of white light emitted from the phosphor layer 251.

  If light from 56 laser light sources 205 is to be collected by a condenser lens, a very large lens is required. However, in this embodiment, the use of two reflecting members 220 having the concave reflecting surface 221 can suppress an increase in size of the apparatus.

  The position of the axis A serving as a reference for defining the arrangement positions of the plurality of condensing optical systems 217 may be set as appropriate. That is, a plurality of condensing optical systems 217 may be arranged with a predetermined reference axis with respect to the position of the phosphor layer 251 as symmetry. An axis A that passes through the condensing point 260 as shown in FIG. 16 may be set as a predetermined reference axis based on the position of the phosphor layer 251. For example, the center of the phosphor wheel 52 shown in FIG. A rotating shaft 55 may be set.

  Note that the plurality of condensing optical systems 217 are not limited to the set of the first and second optical systems 211 and 212 according to the second embodiment. A plurality of sets of the first and second optical systems 11 and 12 described in the first embodiment may be arranged. A plurality of sets of first and second optical systems according to other embodiments to be described later may be arranged as a condensing optical system.

  Note that the configuration shown in FIG. 16 can also be viewed as one first light source unit. That is, 56 laser light sources 205 are set as a plurality of laser light sources. One collimator lens 215 provided in each laser light source 205 constitutes one first optical system. It can also be considered that one second optical system is constituted by a plurality of reflecting members and a plurality of planar reflecting members.

<Third Embodiment>
A light source device according to a third embodiment of the present technology will be described. 17 and 18 are diagrams showing a configuration of the first light source unit 310 according to the present embodiment. FIG. 19 is a diagram showing the number and arrangement positions of a plurality of laser light sources 305. 20 and 21 are tables showing respective data relating to the first light source unit 310.

  As shown in FIGS. 17 and 18, in the present embodiment, the second optical system 312 includes a concave lens 325. The concave lens 325 corresponds to an optical member that guides the light from the plurality of laser light sources 305 reflected by the concave reflecting surface 321 to the phosphor layer 351. By the concave lens 325, the blue laser light B1 reflected by the concave reflecting surface 321 is condensed at a predetermined condensing point 360 on the phosphor layer 351. FIG. 18 is a diagram of the first light source unit 310 as viewed from the back side of the plurality of laser light sources 305 toward the reflecting member 320.

  As shown in FIG. 19, the present embodiment uses 28 laser light source arrays similar to those in the above embodiment. A blue laser beam B1 of a substantially parallel light beam is emitted along the normal direction (z-axis direction) of the surface on which the plurality of laser light sources 305 are arranged. The blue laser beam B1 is reflected toward the concave lens 325 by the concave reflecting surface 321. Then, the concave laser lens 325 focuses the blue laser beam B1 onto the phosphor layer 351.

  The concave lens 325 is arranged between the concave reflecting surface 321 and the phosphor layer 351 along the phosphor layer 351 along the approximate center of the light beam from the concave reflecting surface 321 (in the direction of the arrow M). ing. By disposing the concave lens 325, the condensing point 360 of the reflected light from the concave reflecting surface 321 can be adjusted in the direction of the arrow M. As a result, the degree of freedom regarding the design of the second optical system 312 can be increased, and the light source device can be downsized. The arrangement positions of the plurality of laser light sources 305, the reflecting member 320, and the concave lens 325 can be set as appropriate.

  In the table of FIG. 20, the focal length f2 of the second optical system 312 is the focal length of the optical system including the reflecting member 320 and the concave lens 325. In the present embodiment, the focal length fM of the concave reflecting surface 321 is 57.000, and the focal length fm of the concave lens 325 is −5.814. By arranging these components as shown in FIG. 11, the focal length f2 of the second optical system 312 is 76.685.

  S6 set as an eccentric surface is a flat surface on the back side of the concave lens 325. The surface S6 is decentered by 40 ° in the y-axis clockwise direction and −1.8 mm in the x-axis direction with respect to the xy plane. The surface S7 is the concave surface 324 of the concave lens 325 and has a radius of curvature of -2.800. In the present embodiment, the concave surface 324 of the concave lens 325 is a spherical surface.

When a member having power, in other words, a member having a predetermined focal length is used as the optical member, the focal length is considered. As a result, it is desirable that the focal length of the optical member satisfies the following conditional expression (4).
−200 <f2 / fm <200 (4)
f2: focal length of the second optical system fm: focal length of the optical member

  Conditional expression (4) appropriately defines the focal length of the second optical system 312 and the focal length of the optical member. The second optical system 312 is established regardless of whether an optical member having a positive power or a negative power is used. Therefore, the focal length of the optical member may be a positive value or a negative value. However, if the upper and lower limits of the conditional expression (4) are not satisfied, the absolute value of the power (the absolute value of the focal length of the optical member) is too large, and the blue laser beam B1 is condensed at the intended condensing point 360. Has been found to be difficult. That is, when the conditional expression (4) is satisfied, the blue laser beam B1 can be focused with high accuracy on the intended focusing point.

Further, when the optical member is constituted by a lens, it is desirable that the focal length of the lens satisfies the following conditional expression (5).
−100 <fM / fm <100 (5)
fM: focal length of concave reflecting surface fm: focal length of lens

  Conditional expression (5) appropriately defines the focal length of the concave reflecting surface 321 and the focal length of the lens. In the present embodiment, the concave lens 325 having a negative focal length is used, but a lens having a positive focal length may be used. Similar to the description of conditional expression (4), if the absolute value of the focal length of the lens is too large, the accuracy of light collection may be reduced. Therefore, when the conditional expression (5) is satisfied, the blue laser beam B1 can be condensed with high accuracy at the intended condensing point.

  Depending on various conditions, a smaller range included in the ranges shown in conditional expressions (4) and (5) may be established as an effective range.

<Fourth Embodiment>
A light source device according to a fourth embodiment of the present technology will be described. 22 and 23 are diagrams showing a configuration of the first light source unit 410 according to the present embodiment. FIG. 24 is a diagram showing the number and arrangement positions of a plurality of laser light sources 405. FIG. 25 and FIG. 26 are tables showing respective data regarding the first light source unit 410.

  As shown in FIGS. 22 and 23, the second optical system 412 according to the present embodiment has a concave lens 425 as an optical member, as in the third embodiment. As shown in the table of FIG. 25, the surface S7 which is the concave surface 424 of the concave lens 425 is formed of an aspherical surface. In FIG. 26, data of the aspheric surface of the surface S7 is described.

  Thus, the concave lens 425 having the aspheric concave surface 424 may be used as the light source member. Even in this case, the accuracy of light collection by the second optical system 412 can be improved by satisfying the conditional expressions (4) and (5). In this embodiment, the focal length fM of the concave reflecting surface 421 is 107.681, and the focal length fm of the concave lens 425 is −2.655.

  FIG. 27 is a diagram illustrating a configuration example when two first light source units 410 illustrated in FIG. 22 are used. As shown in FIG. 27, a condensing optical system 417 having the first and second optical systems 411 and 412 as one set is disposed at two positions where the axis A passing through the phosphor layer 451 is symmetrical. ing. As a result, the number of laser light sources 405 can be increased, and the brightness of the emitted white light can be increased.

  The first light source unit 310 according to the third embodiment shown in FIG. 17 is compared with the first light source unit 410 according to the present embodiment. Then, the distance between the plurality of laser light sources 405 and the reflecting member 420 is larger in the first light source unit 410 according to the present embodiment. This is because a concave lens 425 having an aspheric surface is used as the light source member. As a result, it is easy to arrange a plurality of condensing optical systems 417 at positions symmetrical with respect to the axis A. As described above, an optical member included in the second optical system 412 may be appropriately selected for the purpose of arranging the plurality of condensing optical systems 417.

<Fifth Embodiment>
A light source device according to a fifth embodiment of the present technology will be described. 28 and 29 are diagrams showing the configuration of the first light source unit 510 according to the present embodiment. FIG. 30 is a diagram showing the number and arrangement positions of a plurality of laser light sources 505. FIG. 31 and FIG. 32 are tables showing each data regarding the first light source unit 510.

  As shown in FIG. 30, in this embodiment, a total of eight laser light source arrays in which three are arranged in the x-axis and y-axis directions and the centers are vacant are used as the plurality of laser light sources 505. As shown in FIG. 28, a reflecting member 520 having a concave reflecting surface 521 is disposed at a position where the plurality of laser light sources 505 face each other. The reflection member 520 is disposed at a position relatively close to the plurality of laser light sources 505 so as to cover the plurality of laser light sources 505.

  As shown in FIG. 29, a reflecting member 525 having a concave reflecting surface 524 is disposed as an optical member at a vacant position at the approximate center of the eight laser light sources 505. Hereinafter, the reflecting member 520 is referred to as a first reflecting member 520 having a first concave reflecting surface 521. On the other hand, the reflection member 525 as an optical member is referred to as a second reflection member 525 having a second concave reflection surface 524.

  The second reflecting member 525 is disposed so that the second concave reflecting surface 524 faces the first concave reflecting surface 521. An opening 527 is formed substantially at the center of the first concave reflecting surface 521, and a predetermined condensing light on the phosphor layer 551 is located on the other side of the opening 527 (on the opposite side of the first concave reflecting surface 521). Point 560 is set.

  A blue laser beam B1 of a substantially parallel light beam is emitted along the normal direction (z-axis direction) of the surface on which the plurality of laser light sources 505 are arranged. The blue laser beam B1 is reflected toward the second reflecting member 525 by the first concave reflecting surface 521. Then, the blue laser light B 1 is reflected by the second concave reflecting surface 524, and is condensed at the condensing point 560 through the opening 527.

  In the table of FIG. 31, the focal length f2 of the second optical system 512 is the focal length of the optical system including the first and second reflecting members 520 and 525. In the present embodiment, the focal length fM of the first concave reflecting surface 521 is 11.480, and the focal length fm of the second reflecting member 525 is 1.400. By arranging these components as shown in FIG. 28, the focal length f2 of the second optical system 512 is 133.933.

  The surface S6 is the second concave reflecting surface 524 and has a radius of curvature of 2.800. In the present embodiment, the second concave reflecting surface 524 is a spherical surface. As described above, the first light source unit 510 can be downsized by appropriately using the concave reflecting surface 524 as an optical member. As a result, the enlargement of the light source device can be suppressed. It is also advantageous to arrange a plurality of first light source units 510.

When the optical member has the concave reflecting surface 524, it is desirable that the focal length of the optical member satisfies the following conditional expression (6).
0.5 <fM / fm <50 (6)
fM: focal length of the first concave reflecting surface fm: focal length of the optical member (focal length of the second concave reflecting surface)

  Conditional expression (6) appropriately defines the focal lengths of the first and second concave reflecting surfaces 521 and 524. When the upper and lower limits of the conditional expression (6) are not satisfied, the power of the second concave reflecting surface 524 becomes too large, and there is a possibility that the accuracy of light collection is lowered. Therefore, by appropriately setting the focal length so as to satisfy the conditional expression (6), the blue laser light B1 can be condensed with high accuracy at the intended condensing point.

  It is also conceivable that a smaller range included in the range represented by the conditional expression (6) is established as an effective range depending on various conditions.

<Sixth Embodiment>
A light source device according to a sixth embodiment of the present technology will be described. 33 and 34 are diagrams showing the configuration of the first light source unit 610 according to the present embodiment. FIG. 35 is a diagram illustrating the number and arrangement positions of a plurality of laser light sources 605. 36 and 37 are tables showing respective data regarding the first light source unit 610.

  The first light source unit 610 according to the present embodiment has substantially the same configuration as the first light source unit 510 of the fifth embodiment. The main difference from the first light source unit 510 is the number of the plurality of laser light sources 605 and the position of the second reflecting member 625. Accordingly, the data values shown in FIGS. 36 and 37 are also different.

  As shown in FIG. 35, in the present embodiment, a total of twelve laser light source arrays arranged in the x-axis direction and three in the y-axis direction are used as the plurality of laser light sources 605. As shown in FIGS. 33 and 34, the second reflecting member is located at a substantially central position of the twelve laser light sources 605 and closer to the first concave reflecting surface 621 than the plurality of laser light sources 605. 625 is arranged.

  A blue laser beam B1 of a substantially parallel light beam is emitted along the normal direction (z-axis direction) of the surface on which the plurality of laser light sources 605 are arranged. The blue laser beam B1 is reflected toward the second reflecting member 625 by the first concave reflecting surface 621. Then, the blue laser light B 1 is reflected by the second concave reflecting surface 624 and is condensed at the condensing point 660 through the opening 627.

  Even in such a configuration, the accuracy of light collection by the second optical system 612 can be improved by satisfying the conditional expression (6) described above. In this embodiment, the focal length fM is 15.680, and the focal length fm is 1.670.

<Seventh Embodiment>
A light source device according to a seventh embodiment of the present technology will be described. 38 and 39 are diagrams illustrating the configuration of the first light source unit 710 according to the present embodiment. FIG. 40 is a diagram showing the number and arrangement positions of a plurality of laser light sources 705. 41 and 42 are tables showing data regarding the first light source unit 710. FIG.

  Also in the first light source unit 710 according to the present embodiment, the second optical system 712 includes a second reflecting member 725 having a second concave reflecting surface 724 as an optical member. As shown in FIGS. 38 and 39, in the present embodiment, a condensing point 760 on the phosphor layer 751 is located relatively far from the positions of the plurality of laser light sources 705 and the first reflecting member 720 in the x-axis direction. Is set. In order to condense the blue laser beam B1 at the condensing point 760, the second reflecting member 725 is also disposed at a position away from the first reflecting member 720 and the like. As shown in FIG. 40, 28 laser light source arrays are used as the plurality of laser light sources 705.

  Even in such a configuration, the accuracy of light collection by the second optical system 712 can be improved by satisfying the conditional expression (6) described above. In this embodiment, the focal length fM is 55.620, and the focal length fm is 8.378.

  FIG. 43 is a diagram illustrating a configuration example when two first light source units 710 illustrated in FIG. 38 are used. As shown in FIG. 43, a condensing optical system 717 including the first and second optical systems 711 and 712 as one set is disposed at two positions where the axis A passing through the phosphor layer 751 is symmetric. ing. As a result, the number of laser light sources 705 can be increased, and the brightness of the emitted white light can be increased.

  For example, an optimal configuration for arranging a plurality of condensing optical systems 717 can be realized by appropriately setting the position of the second reflecting member 725 and the like. Note that the two second concave reflecting surfaces 724A and 724B shown in FIG. 43 are both spherical. For example, the concave reflecting surface 726 made of one spherical surface may be used in place of the two second concave reflecting surfaces 724A and 724B.

  When one second concave reflecting surface 724 is used for one condensing optical system as in the present embodiment, adjustment for each condensing optical system 717 can be easily performed. Note that an adjustment mechanism that can appropriately adjust the position, the arrangement angle, and the like of each of the plurality of second concave reflecting surfaces 724 may be used. This is not limited to the case where the optical member included in the second optical system 712 is the second reflecting member 725.

  In other words, a plurality of condensing optical systems each including a first optical system and a second optical system including a reflecting member (first reflecting member) and an optical member (second reflecting member) are arranged. Let's say. In this case, an adjustment mechanism that can adjust the positions and arrangement angles of the plurality of optical members may be used. Thereby, a plurality of condensing optical systems can be easily arranged.

  The configuration of the adjustment mechanism is not limited. For example, a holding mechanism that holds the optical member, a guide mechanism that rotates or moves the holding mechanism, and the like may be used as appropriate. The optical member may be adjusted and fixed at an appropriate position by the adjusting mechanism. Further, a configuration in which the position of the optical member can be adjusted during the operation of the light source device using an actuator or the like may be employed.

<Eighth Embodiment>
A light source device according to an eighth embodiment of the present technology will be described. 44 and 45 are diagrams showing a configuration of the first light source unit 810 according to the present embodiment. FIG. 46 is a diagram showing the number and arrangement positions of a plurality of laser light sources 805. 47 and 48 are tables showing respective data relating to the first light source unit 810.

  As shown in FIG. 46, in this embodiment, as a plurality of laser light sources 805, four laser light sources 805 are arranged in the x-axis direction, three are arranged in the y-axis direction, and a total of two laser light sources are free for two centers. An array is used. As shown in FIG. 44, a reflecting member 820 having a concave reflecting surface 821 is disposed at a position where the plurality of laser light sources 805 face each other. The reflection member 820 is disposed at a position relatively close to the plurality of laser light sources 805 so as to cover the plurality of laser light sources 805.

  As shown in FIG. 45, a convex reflecting member 825 having a convex reflecting surface 824 as an optical member is disposed at a vacant position at the approximate center of the ten laser light sources 805. The convex reflection member 825 is disposed at a position closer to the concave reflection surface 821 than the plurality of laser light sources 805.

  The convex reflection member 825 is disposed such that the convex reflection surface 824 faces the concave reflection surface 821. An opening 827 is formed in the approximate center of the concave reflecting surface 821, and a predetermined condensing point 860 on the phosphor layer 851 is set on the other side of the opening 827 (on the opposite side of the concave reflecting surface 821). Yes.

  A blue laser beam B1 of a substantially parallel light beam is emitted along the normal direction (z-axis direction) of the surface on which the plurality of laser light sources 805 are arranged. The blue laser beam B1 is reflected by the concave reflecting surface 821 toward the convex reflecting member 825. Then, the blue laser light B 1 is reflected by the convex reflecting surface 824, and is condensed at the condensing point 860 through the opening 827.

  In the table of FIG. 47, the focal length f2 of the second optical system 812 is the focal length of the optical system including the reflecting member 820 and the convex reflecting member 825. In the present embodiment, the focal length fM of the concave reflecting surface 821 is 11.025, and the focal length fm of the convex reflecting member 825 is −4.285. By arranging these components as shown in FIG. 44, the focal length f2 of the second optical system 812 is 37.494.

  The surface S6 is a convex reflecting surface 824 formed of an aspherical surface. In the table of FIG. 48, data on the aspheric surface of the surface S6 is described. Thus, the first light source unit 810 can be downsized by appropriately using the convex reflection member 825 as the optical member. As a result, the enlargement of the light source device can be suppressed. It is also advantageous to arrange a plurality of first light source units 810.

When the optical member has the convex reflecting surface 824, it is desirable that the focal length of the optical member satisfies the following conditional expression (7).
−50 <fM / fm <−0.5 (7)
fM: focal length of concave reflecting surface fm: focal length of optical member (focal length of convex reflecting surface)

  Conditional expression (7) appropriately defines the focal length of the concave reflecting surface 821 and the focal length of the convex reflecting surface 824. When the upper and lower limits of the conditional expression (7) are not satisfied, the power of the convex reflecting surface 824 becomes too large, and there is a possibility that the accuracy of condensing decreases. Accordingly, by appropriately setting the focal length so as to satisfy the conditional expression (7), the blue laser light B1 can be condensed with high accuracy at the intended condensing point.

  Note that, depending on various conditions, it is conceivable that a smaller range included in the range represented by the conditional expression (7) is established as an effective range.

<Ninth Embodiment>
A light source device according to a ninth embodiment of the present technology will be described. 49 and 50 are diagrams showing a configuration of the first light source unit 910 according to the present embodiment. FIG. 51 is a diagram showing the number and arrangement positions of a plurality of laser light sources 905. 52 and 53 are tables showing respective data relating to the first light source unit 910.

  The first light source unit 910 according to the present embodiment has substantially the same configuration as the first light source unit 810 of the eighth embodiment. The main difference from the first light source unit 810 is the number of the plurality of laser light sources 905. Accordingly, the data values shown in FIGS. 52 and 53 are also different.

  As shown in FIG. 51, in the present embodiment, a total of eight laser light source arrays in which three are arranged in the x-axis and y-axis directions and the centers are vacant are used as the plurality of laser light sources 905. As shown in FIGS. 49 and 50, the convex reflecting member 925 is disposed at a substantially central position of the eight laser light sources 905.

  A blue laser beam B1 of a substantially parallel light beam is emitted along the normal direction (z-axis direction) of the surface on which the plurality of laser light sources 905 are arranged. The blue laser beam B1 is reflected by the first concave reflecting surface 921 toward the convex reflecting member 925. Then, the blue laser light B1 is reflected by the convex reflecting surface 924, and is condensed at the condensing point 960 through the opening.

  Even in such a configuration, the accuracy of light collection by the second optical system 912 can be improved by satisfying the conditional expression (7). In this embodiment, the focal length fM is 7.670, and the focal length fm is −8.278.

  FIG. 54 is a table showing data in the first to ninth embodiments. As shown in the table of FIG. 54, it is understood that conditional expressions (1) to (7) are satisfied in each embodiment.

<Tenth Embodiment>
A light source device according to a tenth embodiment of the present technology will be described. FIG. 55 is a diagram showing a configuration of the first light source unit according to the present embodiment. As shown in FIG. 55, in the present embodiment, four first light source units 1010 are arranged. The first light source unit 1010 includes a condensing optical system 1017 in which the first and second optical systems are groups of 1011 and 1012. Note that the first light source unit 1010 has substantially the same configuration as the first light source unit 910 described in the ninth embodiment.

  The four first light source units 1010 are arranged symmetrically about the origin O of the xy coordinates shown in FIG. Therefore, in this actual child form, the axis extending in the direction perpendicular to the paper surface at the position of the origin O corresponds to a predetermined reference axis. The first light source unit 1010 emits the blue laser beam B1 from the substantially central opening 1027 and condenses it. A condensing point A-D by each first light source unit 1010 is a symmetric position around the origin O of the xy coordinates.

As shown in FIG. 55, the position of the condensing point AD of the first light source member 1010A-D is expressed as follows using the xy coordinate system and the length mm as the coordinate value.
Condensing point A (-17mm, 17mm)
Condensing point B (17mm, 17mm)
Condensing point C (-17mm, -17mm)
Condensing point D (17mm, -17mm)

  The distances from the light collecting points to the origin O are equal to each other. Accordingly, the condensing point A-D is located on the circumference of a circle having a diameter Φ of about 48 mm with the origin O as the center. These four condensing points AD are aligned with predetermined positions of the phosphor layer provided on the phosphor wheel 1052.

  When a plurality of condensing points A-D are set, the phosphor layer becomes high temperature because the blue laser light B1 is condensed at the plurality of points. When the number of condensing points increases, the luminous efficiency of the phosphor layer may be saturated or the phosphor layer may burn. In order to avoid such a situation, the phosphor wheel 1052 is used, and is rotated at a high speed so that the blue laser beam B1 is not continuously irradiated to the same position.

  Here, consider a case where the origin O ′ of the x′y ′ coordinates, which is the central axis of the phosphor wheel 1052 shown in FIG. If it does so, four condensing points AD will be arrange | positioned on the circumference of about 48 mm in diameter centering | focusing on origin O 'among the fluorescent substance layers arrange | positioned at the fluorescent substance wheel 1052. FIG. In this case, even if the phosphor wheel 1052 is rotated at a high speed, the blue laser light B1 is condensed at four condensing points on the circumference. That is, since the blue laser beam B1 is intensively irradiated onto one circumference on the phosphor layer, there is a possibility that phosphor saturation and combustion occur.

  Therefore, in the present embodiment, the origin O ′ is set so as to be shifted from the position of the origin O. Thereby, the condensing points A to D are set at four positions on the phosphor layer arranged on the arrangement surface of the phosphor wheel 1052 at different distances from the origin O ′ that is the position of the rotation axis. .

For example, as shown in FIG. 55, it is assumed that the origin O ′ is shifted from the origin O by (2.5 mm, −1.5 mm) on the xy coordinates. Then, as shown in FIG. 56, the positions of the condensing points AD are set at different distances from the origin O ′. When the phosphor wheel 1052 rotates in this state, each condensing point is set on the circumference of a circle shown below centered on the origin O ′.
Condensing point A Circle C1 with a diameter of 54 mm
Condensing point B Circle C2 with a diameter of 47 mm
Condensing point C Circle C3 with a diameter of 49 mm
Condensing point A Circle C4 with a diameter of 42.5 mm

  Thereby, four condensing points AD can be distributed and set on four circumferences on the phosphor layer. Accordingly, it is possible to prevent the blue laser beam B1 from being intensively irradiated on one circumference. As a result, phosphor saturation and combustion can be prevented. It is assumed that the phosphor layer is arranged on the phosphor wheel 1052 in a range including the four circles C1-C4.

  The method for setting the condensing points at a plurality of different positions from the rotation axis O ′ of the phosphor wheel 1052 is not limited. Typically, as described in the present embodiment, the center O of the circle where the plurality of condensing points AD are arranged on the circumference and the center O ′ of the phosphor wheel 1052 do not coincide with each other. Is done. When considering the xy coordinate system including the center O and the x′y ′ coordinate system including O ′, the displacement amount between the x axis and the x ′ axis does not match the displacement amount between the y axis and the y ′ axis. Is set as follows.

  The phosphor layer may be applied to the entire arrangement surface of the phosphor wheel 1052, or may be independently applied to positions corresponding to the circles C1-C4 formed by the respective condensing points AD. Good.

<Eleventh embodiment>
A light source device according to an eleventh embodiment of the present technology will be described. FIG. 57 is a diagram showing a configuration of the light source device according to the present embodiment. The light source device 1100 according to the present embodiment can change the light beam of the white light W1, which is the emitted light emitted from the second light source unit 1120, into a substantially parallel light beam, and has a variable focal length. System 1130 is included.

  57, the configuration of the first and second light source units 1110 and 1120 is substantially the same as the configuration according to the second embodiment shown in FIG. However, the present invention is not limited to this configuration, and the configurations described in other embodiments may be used as appropriate.

  The third optical system 1030 is an optical system for taking the luminous flux emitted from the second light source unit 1120 into the illumination system 1500 (see FIG. 58). In the example shown in FIG. 57, the axis A passing through the condensing point 1160 is aligned with the optical axis of the third optical system 1030. Light is emitted from the condensing point 1160 of the phosphor layer with approximately Lambertian, and the emitted light beam is converted into a substantially parallel beam by the third optical system 1130 and then emitted to the illumination system 1500.

  As described above, the focal length of the third optical system 1130 is variable. For example, a focus mechanism that moves the third optical system 1130 in the optical axis direction is provided. As a result, the light emitted from the light source from the second light source unit 1120 can be efficiently taken into the illumination system 1500 without deterioration.

  In the present embodiment, a third optical system 1130 is constituted by two lenses 1131 and 1132. However, the configurations of the third optical system 1130 and the focus mechanism are not limited.

  It should be noted that the specific shapes of the respective parts exemplified in the above embodiments and the numerical values shown in the table of FIG. 54 are merely examples of the implementation that is performed when the present technology is carried out. The technical scope is not limited.

<Image display device>
The image display apparatus according to the present embodiment will be described. Here, a projector capable of mounting the light source device described in the above embodiment will be described as an example. FIG. 58 is a schematic diagram showing a configuration example of the projector.

  The projector 2000 includes a light source device 1200 according to the present technology, an illumination system 1500, and a projection system 1700. The illumination system 1500 includes an image generation element 1510 that generates an image based on the irradiated light, and an illumination optical system 1520 that irradiates the image generation element 1510 with light emitted from the light source device 1200. The projection system 1700 projects the image generated by the image generation element 1510.

  As illustrated in FIG. 58, the illumination system 1500 includes an integrator element 1530, a polarization conversion element 1540, and a condenser lens 1550. Integrator element 1530 has a first fly-eye lens 1531 having a plurality of microlenses arranged two-dimensionally, and a second having a plurality of microlenses arranged to correspond to each of the microlenses. The fly eye lens 1532 is included.

  The parallel light incident on the integrator element 1530 from the light source device 1200 is divided into a plurality of light beams by the microlens of the first fly-eye lens 1531 and imaged on the corresponding microlens in the second fly-eye lens 1532. . Each of the micro lenses of the second fly-eye lens 1532 functions as a secondary light source, and irradiates the polarization conversion element 1540 with incident light as a plurality of parallel lights with uniform brightness.

  The integrator element 1530 as a whole has a function of adjusting incident light irradiated from the light source device 1200 to the polarization conversion element 1540 into a uniform luminance distribution.

  The polarization conversion element 1540 has a function of aligning the polarization state of incident light incident through the integrator element 1530 and the like. The polarization conversion element 1540 emits outgoing light including blue laser light B3, green light G3, and red light R3 via, for example, a condenser lens 1550 disposed on the outgoing side of the light source device 1200.

  The illumination optical system 1520 includes dichroic mirrors 1560 and 1570, mirrors 1580, 1590 and 1600, relay lenses 1610 and 1620, field lenses 1630R, 1630G and 1630B, liquid crystal light valves 1510R, 1510G and 1510B as image generation elements, and a dichroic prism 1640. Is included.

  The dichroic mirrors 1560 and 1570 have a property of selectively reflecting color light in a predetermined wavelength range and transmitting light in other wavelength ranges. Referring to FIG. 58, for example, dichroic mirror 1560 selectively reflects red light R3. The dichroic mirror 1570 selectively reflects the green light G3 out of the green light G3 and the blue light B3 transmitted through the dichroic mirror 1560. The remaining blue light B3 passes through the dichroic mirror 1570. Thereby, the light emitted from the light source device 1200 is separated into a plurality of color lights of different colors.

  The separated red light R3 is reflected by the mirror 1580, collimated by passing through the field lens 1630R, and then enters the liquid crystal light valve 1510R for modulating red light. The green light G3 is collimated by passing through the field lens 1630G, and then enters the liquid crystal light valve 1510G for green light modulation. The blue light B3 passes through the relay lens 1610 and is reflected by the mirror 1590, and further passes through the relay lens 1620 and is reflected by the mirror 1600. The blue light B3 reflected by the mirror 1600 is collimated by passing through the field lens 1630B, and then enters the liquid crystal light valve 1510B for modulating blue light.

  The liquid crystal light valves 1510R, 1510G, and 1510B are electrically connected to a signal source (not shown) (for example, a PC) that supplies an image signal including image information. The liquid crystal light valves 1510R, 1510G, and 1510B modulate incident light for each pixel based on the supplied image signals of each color, and generate a red image, a green image, and a blue image, respectively. The modulated light of each color (formed image) enters the dichroic prism 1640 and is synthesized. The dichroic prism 1640 superimposes and synthesizes light of each color incident from three directions and emits the light toward the projection system 1700.

  The projection system 1700 includes a plurality of lenses 1710 and the like, and irradiates a screen (not shown) with light synthesized by the dichroic prism 1640. Thereby, a full-color image is displayed.

  As described in the above embodiments, the light source device 1200 according to the present technology uses the concave reflecting surface to collect the laser beams from the plurality of laser light sources. Thereby, size reduction of a light source device can be achieved. Further, by appropriately arranging an optical member different from the concave reflecting surface in the second optical system, it is possible to give variations to the configuration of the light source member.

  As a result, for example, as shown in FIGS. 59 and 60, the light source device 1200 according to the present embodiment can be appropriately configured so as to be housed in a limited space. In the projector 2100 shown in FIG. 59, a light source device 1200 (second embodiment in FIG. 16) having a small size with respect to the emission direction (length direction) of the emitted light is used. In the projector 2200 shown in FIG. 60, a light source device 1200 (fourth embodiment in FIG. 27) having a small size with respect to a direction (width direction) orthogonal to the emission direction is used. Since the configuration of the light source device can be appropriately set in this way, it is possible to reduce the size of the projector and improve the design of the external shape of the projector.

<Other embodiments>
The present technology is not limited to the embodiments described above, and other various embodiments can be realized.

  For example, an optical element such as a dichroic film may be disposed between the phosphor layer and the first light source unit, typically on the mounting surface of the phosphor wheel or on the opposite surface thereof. Blue laser light incident at an incident angle smaller than a predetermined value is transmitted, and blue laser light incident at an incident angle larger than a predetermined value is reflected. By using such an optical element, it is possible to irradiate the phosphor layer again with at least a part of the blue laser light reflected by the phosphor layer (light having a large incident angle). As a result, the utilization efficiency of the blue laser light can be improved.

  When such an optical element is used, a concave lens as shown in FIG. 17 may be used as appropriate in order to reduce the incident angle of the blue laser light irradiated first. Thereby, it is possible to prevent the blue laser light irradiated first from being reflected by the optical element. As described above, various objects can be achieved by appropriately selecting an optical member such as a lens used in the second optical system.

  The projector shown in FIG. 58 describes an illumination system 1500 configured using a transmissive liquid crystal panel. However, it is possible to configure an illumination system using a reflective liquid crystal panel. A digital micromirror device (DMD) or the like may be used as the image generation element. Furthermore, instead of the dichroic prism 1640, a polarization beam splitter (PBS), a color synthesis prism that synthesizes RGB video signals, a TIR (Total Internal Reflection) prism, or the like may be used.

  In the above, devices other than the projector may be configured as the image display device according to the present technology. Further, the light source device according to the present technology may be used for a device that is not an image display device.

  It is also possible to combine at least two feature portions among the feature portions of each embodiment described above.

In addition, this technique can also take the following structures.
(1) one or more solid-state light sources that emit light in a predetermined wavelength range;
A first optical system having at least one aspherical surface that converts a light beam from the one or more solid-state light sources into a substantially parallel light beam;
One or more light emitters that are excited by light from the one or more solid-state light sources to emit visible light in a wavelength region longer than the wavelength of the light, and from the light in the predetermined wavelength region and the one or more light emitters An emission part capable of emitting light including visible light as emission light;
Reflecting the light from the one or more solid-state light sources that has been converted into the substantially parallel light beam by the first optical system by the concave reflecting surface, and having the at least one concave reflecting surface, A light source device comprising: a second optical system that focuses light on one or more light emitters.
(2) The light source device according to (1),
The first and second optical systems each have a focal length that satisfies the following expression.
1 <f2 / f1 <80
f1: Focal length of the first optical system f2: Focal length of the second optical system (3) The light source device according to (1) or (2),
The at least one concave reflecting surface is a rotationally symmetric aspherical surface that satisfies the following expression.
-1.5 <Km <-0.5
Km: the conic constant of the concave reflecting surface (4), the light source device according to (1) or (2),
The at least one concave reflecting surface is a free-form surface having no rotational symmetry axis.
(5) The light source device according to any one of (1) to (4),
The second optical system includes an optical member that guides light from the one or more solid-state light sources reflected by the concave reflecting surface to the light emitter.
(6) The optical device according to (5),
The optical member has a focal length that satisfies the following expression.
−200 <f2 / fm <200
f2: focal length of the second optical system fm: focal length of the optical member (7) The light source device according to (5) or (6),
The optical member is a lens and has a focal length satisfying the following expression.
−100 <fM / fm <100
fM: focal length of concave reflecting surface fm: focal length of lens (8) The light source device according to (5) or (6),
The optical member has a concave reflection surface included in the first optical system as a first concave reflection surface, has a second concave reflection surface different from the first concave reflection surface, and satisfies the following expression: An optical member having a focal length.
0.5 <fM / fm <50
fM: Focal length of the first concave reflecting surface fm: Focal length of the optical member (9) The light source device according to (5) or (6),
The optical member has a convex reflecting surface and has a focal length satisfying the following expression.
−50 <fM / fm <−0.5
fM: the focal length of the concave reflecting surface fm: the focal length of the optical member (10) The light source device according to (5),
The optical member has a planar reflection surface that reflects light from the one or more solid-state light sources reflected by the concave reflection surface to the light emitter.
(11) The light source device according to (10),
The plane reflecting surface is defined by the following equation, assuming that the state parallel to the arrangement surface on which the light emitter is disposed is 0 °, and the rotational direction from the state toward the concave reflecting surface is positive about a predetermined rotation axis. A light source device arranged at a rotation angle to satisfy.
0 ° <Am <60 °
Am: rotation angle of the plane reflecting surface (12) The light source device according to any one of (1) to (11),
A light source device in which a plurality of condensing optical systems each including the first and second optical systems are arranged symmetrically with a predetermined reference axis with respect to the position of the light emitter.
(13) The light source device according to (12),
The second optical system includes an optical member that guides light from the one or more solid light sources reflected by the concave reflecting surface to the light emitter.
The light source device further includes an adjustment mechanism that adjusts an arrangement of the optical member included in each condensing optical system.
(14) The light source device according to any one of (1) to (13),
The emitting portion includes a rotating wheel that rotates around a predetermined rotation axis that includes an arrangement surface on which the light emitter is arranged and extends in a direction perpendicular to the arrangement surface,
The second optical system condenses the light from the first optical system at a plurality of positions on the light-emitting body arranged on the arrangement surface of the rotating wheel and having different distances from the rotation axis. Let the optical device.
(15) The light source device according to any one of (1) to (14),
A light source device comprising a third optical system capable of making a light beam of the emitted light emitted from the emission unit a substantially parallel light beam and having a variable focal length.

B1 ... Blue laser light G2 ... Green light R2 ... Red light f1 ... Focal distance of the first optical system f2 ... Focal distance of the second optical system fM ... Focal distance of the concave reflecting surface fm ... Focal distance of the optical member Km ... Conic constant of concave reflecting surface Am: rotation angle of flat reflecting surface W1: white light 5, 205, 305, 405, 505, 605, 705, 805, 905 ... laser light source 10, 210, 310, 410, 510, 610, 710, 810, 910, 1110 ... first light source 11, 211, 411, 711 ... first optical system 12, 212, 312, 412, 512, 612, 712, 812, 912 ... second optical system 15 215 ... Collimator lens 20, 220, 320, 420, 520, 720, 820 ... Reflective member 21, 221, 321, 421, 521, 621, 821 , 921... Concave reflection surface 50, 1120... Second light source unit 51, 251, 351, 451, 551, 751, 851... Phosphor layer 52, 1052. DESCRIPTION OF SYMBOLS 1017 ... Condensing optical system 224 ... Planar reflective surface 225 ... Planar reflective member 325 ... Concave lens 425 ... Concave lens 524, 624, 724 ... Second concave reflective surface 525, 625, 725 ... Second reflective member 824, 924 ... Convex reflection surface 825, 925 ... Convex reflection member 1130 ... Third optical system 1500 ... Illumination system 1510 ... Image generation element 1520 ... Illumination optical system 1700 ... Projection system 2000, 2100, 2200 ... Projector

In order to achieve the above object, a light source device according to an embodiment of the present technology includes a plurality of light source units and a light emitter .
Each of the plurality of light source units includes a plurality of solid light sources arranged on the same surface, a first optical system that converts light beams from the plurality of solid light sources into substantially parallel light beams, and the first optical system. And a second optical system having a concave reflecting surface that reflects and collects light that has been converted into a substantially parallel light beam.
The light emitter is excited by light condensed by the second optical system included in each of the plurality of light source units to emit visible light.
The plurality of light source units are arranged symmetrically with respect to a predetermined reference axis with respect to the position of the light emitter.

In this light source device, in each light source unit, light beams from a plurality of solid-state light sources arranged on the same surface by the first optical system are made into substantially parallel light beams. The substantially parallel light flux light is reflected by the concave surface reflection surface that the second optical system Yusuke, is focused on the light emission body. By concave reflecting surface is used for condensing light to the light - emitting body, even if the number of solid-state light source is increased for high brightness if example embodiment, it is possible to suppress the size of the second optical system, each compact light source unit is capable of ing. In the light source device, the plurality of light source units are arranged symmetrically with respect to a predetermined reference axis with respect to the position of the light emitter. As a result, it is possible to achieve high brightness while suppressing an increase in size of the apparatus.

Claims (19)

A light source device that emits light irradiated to an image generation element of an image generation system,
One or more solid-state light sources that emit light in a predetermined wavelength range;
A first optical system having at least one aspherical surface that converts a light beam from the one or more solid-state light sources into a substantially parallel light beam;
One or more light emitters that are excited by light from the one or more solid-state light sources to emit visible light in a wavelength region longer than the wavelength of the light, and from the light in the predetermined wavelength region and the one or more light emitters An emission part capable of emitting light including visible light as emission light;
Reflecting the light from the one or more solid-state light sources that has been converted into the substantially parallel light beam by the first optical system by the concave reflecting surface, and having the at least one concave reflecting surface, A second optical system for focusing on one or more light emitters,
The first and second optical systems each have a focal length that satisfies the following expression.
4.721 <f2 / f1 <80
f1: Focal length of the first optical system f2: Focal length of the second optical system The light source device according to claim 1,
The at least one concave reflecting surface is a rotationally symmetric aspherical surface that satisfies the following expression.
-1.5 <Km <-0.5
Km: Conic constant of the concave reflecting surface The light source device according to claim 1,
The at least one concave reflecting surface is a free-form surface having no rotational symmetry axis. The light source device according to claim 1,
The second optical system includes an optical member that guides light from the one or more solid light sources reflected by the concave reflecting surface to the light emitter. The light source device according to claim 4,
The optical member has a focal length that satisfies the following expression.
−200 <f2 / fm <200
f2: focal length of the second optical system fm: focal length of the optical member The light source device according to claim 4,
The optical member is a lens, and has a focal length that satisfies the following expression.
−100 <fM / fm <100
fM: focal length of concave reflecting surface fm: focal length of lens The light source device according to claim 4,
The optical member has a concave reflection surface included in the first optical system as a first concave reflection surface, has a second concave reflection surface different from the first concave reflection surface, and satisfies the following expression: A light source device having a focal length.
0.5 <fM / fm <50
fM: focal length of first concave reflecting surface fm: focal length of optical member The light source device according to claim 4,
The optical member has a convex reflecting surface, and has a focal length satisfying the following expression.
−50 <fM / fm <−0.5
fM: focal length of concave reflecting surface fm: focal length of optical member The light source device according to claim 4,
The optical member has a planar reflection surface that reflects light from the one or more solid-state light sources reflected by the concave reflection surface to the light emitter. The light source device according to claim 9,
The plane reflecting surface is defined by the following equation, assuming that the state parallel to the arrangement surface on which the light emitter is disposed is 0 °, and the rotational direction from the state toward the concave reflecting surface is positive about a predetermined rotation axis. A light source device arranged at a rotation angle to satisfy.
0 ° <Am <60 °
Am: rotation angle of the plane reflecting surface The light source device according to claim 1,
A light source device in which a plurality of condensing optical systems each including the first and second optical systems are arranged symmetrically with a predetermined reference axis with respect to the position of the light emitter. The light source device according to claim 11,
The second optical system includes an optical member that guides light from the one or more solid light sources reflected by the concave reflecting surface to the light emitter.
The light source device further includes an adjustment mechanism that adjusts an arrangement of the optical member included in each condensing optical system. The light source device according to claim 1,
The emitting portion includes a rotating wheel that rotates around a predetermined rotation axis that includes an arrangement surface on which the light emitter is arranged and extends in a direction perpendicular to the arrangement surface,
The second optical system condenses the light from the first optical system at a plurality of positions on the light-emitting body arranged on the arrangement surface of the rotating wheel and having different distances from the rotation axis. Let the light source device. The light source device according to claim 1, further comprising:
A light source device comprising a third optical system capable of making a light beam of the emitted light emitted from the emission unit a substantially parallel light beam and having a variable focal length. A light source device that emits light irradiated to an image generation element of an image generation system,
One or more solid-state light sources that emit light in a predetermined wavelength range;
A first optical system having at least one aspherical surface that converts a light beam from the one or more solid-state light sources into a substantially parallel light beam;
One or more light emitters that are excited by light from the one or more solid-state light sources to emit visible light in a wavelength region longer than the wavelength of the light, and from the light in the predetermined wavelength region and the one or more light emitters An emission part capable of emitting light including visible light as emission light;
Reflecting the light from the one or more solid-state light sources that has been converted into the substantially parallel light beam by the first optical system by the concave reflecting surface, and having the at least one concave reflecting surface, A second optical system for focusing on one or more light emitters,
The second optical system has an optical member that has a focal length satisfying the following expression and guides light from the one or more solid light sources reflected by the concave reflecting surface to the light emitter.
−200 <f2 / fm <200
f2: focal length of the second optical system fm: focal length of the optical member A light source device that emits light irradiated to an image generation element of an image generation system,
Each light source part
A plurality of solid-state light sources that emit light in a predetermined wavelength range;
A first optical system having at least one aspheric surface that converts light beams from the plurality of solid-state light sources into substantially parallel light beams;
A second optical system having at least one concave reflecting surface and condensing light from the plurality of solid light sources, which has been converted into the substantially parallel light beam by the first optical system, by reflecting the light from the concave reflecting surface. A plurality of light source units having and
A light emitter that emits visible light in a wavelength region longer than the wavelength of the light by being excited by light from the plurality of solid light sources included in each of the plurality of light source units, and an arrangement surface on which the light emitter is disposed. A rotating wheel that rotates about a predetermined rotation axis extending in a direction perpendicular to the arrangement surface, and can emit light including light in the predetermined wavelength region and visible light from the light emitter as outgoing light A light emitting portion; and
In the plurality of light source units, the light reflected by the concave reflecting surface of the second optical system included in each of the plurality of light source units is arranged on the light emitter disposed on the arrangement surface of the rotating wheel. A light source device arranged so as to collect light at a plurality of positions having different distances from the rotation axis. One or more solid-state light sources that emit light in a predetermined wavelength range;
A first optical system having at least one aspherical surface that converts a light beam from the one or more solid-state light sources into a substantially parallel light beam;
One or more light emitters that are excited by light from the one or more solid-state light sources to emit visible light in a wavelength region longer than the wavelength of the light, and from the light in the predetermined wavelength region and the one or more light emitters An emission part capable of emitting light including visible light as emission light;
Reflecting the light from the one or more solid-state light sources that has been converted into the substantially parallel light beam by the first optical system by the concave reflecting surface, and having the at least one concave reflecting surface, A second optical system that focuses light on one or more light emitters, and the first and second optical systems each have a focal length that satisfies the following formula;
An image generation system including an image generation element that generates an image based on the irradiated light, and an illumination optical system that irradiates the image generation element with light emitted from the light source device;
An image display apparatus comprising: a projection system that projects an image generated by the image generation element.
4.721 <f2 / f1 <80
f1: Focal length of the first optical system f2: Focal length of the second optical system One or more solid-state light sources that emit light in a predetermined wavelength range;
A first optical system having at least one aspherical surface that converts a light beam from the one or more solid-state light sources into a substantially parallel light beam;
One or more light emitters that are excited by light from the one or more solid-state light sources to emit visible light in a wavelength region longer than the wavelength of the light, and from the light in the predetermined wavelength region and the one or more light emitters An emission part capable of emitting light including visible light as emission light;
Reflecting the light from the one or more solid-state light sources that has been converted into the substantially parallel light beam by the first optical system by the concave reflecting surface, and having the at least one concave reflecting surface, A second optical system that focuses light on one or more light emitters, and the second optical system has a focal length satisfying the following formula and is reflected by the concave reflecting surface: A light source device having an optical member for guiding light from a light source to the light emitter;
An image generation system including an image generation element that generates an image based on the irradiated light, and an illumination optical system that irradiates the image generation element with light emitted from the light source device;
An image display apparatus comprising: a projection system that projects an image generated by the image generation element.
−200 <f2 / fm <200
f2: focal length of the second optical system fm: focal length of the optical member (A) Each light source unit is
A plurality of solid-state light sources that emit light in a predetermined wavelength range;
A first optical system having at least one aspheric surface that converts light beams from the plurality of solid-state light sources into substantially parallel light beams;
A second optical system having at least one concave reflecting surface and condensing light from the plurality of solid light sources, which has been converted into the substantially parallel light beam by the first optical system, by reflecting the light from the concave reflecting surface. A plurality of light source units having and
A light emitter that emits visible light in a wavelength region longer than the wavelength of the light by being excited by light from the plurality of solid light sources included in each of the plurality of light source units, and an arrangement surface on which the light emitter is disposed. A rotating wheel that rotates about a predetermined rotation axis extending in a direction perpendicular to the arrangement surface, and can emit light including light in the predetermined wavelength region and visible light from the light emitter as outgoing light The light sources are arranged such that the light reflected by the concave reflecting surface of the second optical system of each of the plurality of light sources is arranged on the arrangement surface of the rotating wheel. A light source device disposed so as to collect light at a plurality of positions at different distances from the rotation axis on the light emitter;
(B) an image generation system including an image generation element that generates an image based on irradiated light, and an illumination optical system that irradiates the image generation element with light emitted from the light source device;
(C) An image display apparatus comprising: a projection system that projects an image generated by the image generation element.

Images