WO2014188645A1

WO2014188645A1 - Optical conversion element and light source using same

Info

Publication number: WO2014188645A1
Application number: PCT/JP2014/001692
Authority: WO
Inventors: 森本　廉; 山中　一彦; 琢磨片山
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2013-05-22
Filing date: 2014-03-25
Publication date: 2014-11-27
Also published as: JP2016145848A

Abstract

An optical conversion element (50) according to the present disclosure and equipped with a rotating body (58) having a rotational axis (57), and also equipped with one or more fluorescent light-emitting parts (51R, 51G, 51B) positioned on the surface of the rotating body (58), wherein the fluorescent light-emitting parts (51R, 51G, 51B) are configured so as to be formed along the circumference centered around the rotational axis (57). This configuration makes it possible to make light sources more compact, because a color wheel comprising a large surface area is no longer necessary.

Description

Optical conversion element and light source using the same

The present disclosure relates to an optical conversion element used in a projector such as a commercial projector, a home projector, and a pico projector, a rear projection television, a head-up display, and the like, and a light source including the optical conversion element.

Hereinafter, a conventional light source will be described with reference to FIGS. 30 and 31. FIG.

As shown in FIG. 30, the conventional light source includes a light emitting diode 1001 that emits ultraviolet light and a color wheel 1002. As shown in FIG. 31, the color wheel 1002 has a partitioned area 1004, an area 1005, and an area 1006. A phosphor layer including a red phosphor is disposed in the region 1004, a phosphor layer including a green phosphor is disposed in the region 1005, and a phosphor layer including a blue phosphor is disposed in the region 1006. ing. By rotating the color wheel 1002, the light emitted from the light emitting diode 1001 is sequentially converted into red, green, and blue, and is driven so that white light is emitted when observed on a time average.

JP 2009-252651 A Japanese National Patent Publication No. 11-064789 JP 2012-8409 A JP 2004-341105 A

However, in the above configuration, since the color wheel 1002 is used, there is a problem that it is difficult to reduce the size of the light source.

This disclosure is intended to reduce the size of the optical conversion element and the light source.

In order to solve the above problems, the optical conversion element of the present disclosure includes a rotating body having a rotating shaft and a plurality of fluorescent light emitting units provided on the rotating body. The plurality of fluorescent light emitting units includes a first fluorescent light emitting unit and a second fluorescent light emitting unit. The 1st fluorescence light emission part and the 2nd fluorescence light emission part are arrange | positioned on the circumference centering on a rotating shaft.

This configuration eliminates the need for a color wheel that occupies a large area, thus reducing the size of the light source.

FIG. 1 is a schematic diagram illustrating a configuration of a light source according to the first embodiment of the present disclosure. FIG. 2 is a schematic diagram illustrating a configuration of the optical conversion element according to the first embodiment of the present disclosure. FIG. 3 is a schematic diagram illustrating the configuration and operation of the light source according to the first embodiment of the present disclosure. FIG. 4 is an excitation timing chart of the fluorescent light emitting unit when seven color sources are generated in a time division manner in the light source according to the first embodiment of the present disclosure. FIG. 5A is a diagram illustrating a spectrum of emitted light from an irradiation light source in the light source according to the first embodiment of the present disclosure. FIG. 5B is a diagram illustrating a spectrum of emitted light from the fluorescent light emitting unit in the light source according to the first embodiment of the present disclosure. FIG. 5C is a diagram illustrating a reflection characteristic of the dichroic mirror in the light source according to the first embodiment of the present disclosure. FIG. 5D is a diagram illustrating a spectrum of emitted light from the light source according to the first embodiment of the present disclosure. FIG. 6 is a diagram illustrating chromaticity coordinates of the emitted light of the light source according to the first embodiment of the present disclosure. FIG. 7A is a schematic diagram illustrating a cross section of an optical conversion element according to Modification 1 of the first embodiment of the present disclosure. FIG. 7B is a schematic diagram illustrating a cross section of the optical conversion element according to the first modification of the first embodiment of the present disclosure. FIG. 8A is a schematic diagram illustrating a cross section of an optical conversion element according to Modification 2 of the first embodiment of the present disclosure. FIG. 8B is a schematic diagram illustrating a cross section of the optical conversion element according to Modification 2 of the first embodiment of the present disclosure. FIG. 9A is a schematic diagram illustrating a manufacturing method of Modification 2 of the optical conversion element according to the first embodiment of the present disclosure. FIG. 9B is a schematic diagram illustrating a manufacturing method of Modification 2 of the optical conversion element according to the first embodiment of the present disclosure. FIG. 9C is a schematic diagram illustrating a manufacturing method of Modification 2 of the optical conversion element according to the first embodiment of the present disclosure. FIG. 9D is a schematic diagram illustrating a manufacturing method of Modification 2 of the optical conversion element according to the first embodiment of the present disclosure. FIG. 10A is a schematic diagram illustrating a cross section of an optical conversion element according to Modification 3 of the first embodiment of the present disclosure. FIG. 10B is a schematic diagram illustrating a cross section of an optical conversion element according to Modification 3 of the first embodiment of the present disclosure. FIG. 11 is a schematic diagram illustrating an optical conversion element according to the second embodiment of the present disclosure. FIG. 12 is a schematic diagram illustrating a configuration of a light source according to the second embodiment of the present disclosure. FIG. 13A is a diagram illustrating a spectrum of light emitted from an irradiation light source in a light source according to the second embodiment of the present disclosure. FIG. 13B is a diagram illustrating a spectrum of emitted light from the fluorescent light emitting unit in the light source according to the second embodiment of the present disclosure. FIG. 13C is a diagram illustrating a reflection characteristic of the dichroic mirror in the light source according to the second embodiment of the present disclosure. FIG. 13D is a diagram illustrating a spectrum of emitted light from a light source according to the second embodiment of the present disclosure. FIG. 14 is a diagram illustrating chromaticity coordinates of the emitted light of the light source according to the second embodiment of the present disclosure. FIG. 15 is a schematic cross-sectional view illustrating a configuration of a light source according to Modification 1 of the second embodiment of the present disclosure. FIG. 16 is a schematic diagram illustrating a light source according to Modification 1 of the second embodiment of the present disclosure. FIG. 17 is a schematic diagram illustrating an optical conversion element in a light source according to Modification 1 of the second embodiment of the present disclosure. FIG. 18 is a schematic diagram illustrating a light source according to the third embodiment of the present disclosure. FIG. 19 is a schematic diagram of an optical conversion element in a light source according to the third embodiment of the present disclosure. FIG. 20 is a schematic diagram illustrating a light source according to a modification of the third embodiment of the present disclosure. FIG. 21 is a schematic diagram showing a cross section taken along line 21-21 of FIG. FIG. 22 is a schematic diagram illustrating an optical conversion element and a light source according to the fourth embodiment of the present disclosure. FIG. 23 is a schematic diagram illustrating an optical conversion element and a light source according to a modification of the fourth embodiment of the present disclosure. FIG. 24 is a schematic diagram illustrating a configuration of a light source according to the fifth embodiment of the present disclosure. FIG. 25 is a schematic diagram illustrating an operation of the light source according to the fifth embodiment of the present disclosure. FIG. 26A is a diagram illustrating a spectrum of light emitted from an irradiation light source in a light source according to the fifth embodiment of the present disclosure. FIG. 26B is a diagram showing a spectrum of emitted light from the fluorescent light emitting unit in the light source according to the fifth embodiment of the present disclosure. FIG. 26C is a diagram illustrating a reflection characteristic of a dichroic mirror in a light source according to the fifth embodiment of the present disclosure. FIG. 26D is a diagram illustrating a spectrum of emitted light from a light source according to the fifth embodiment of the present disclosure. FIG. 27 is a diagram illustrating chromaticity coordinates of the emitted light of the light source according to the fifth embodiment of the present disclosure. FIG. 28A is a diagram illustrating a spectrum of emitted light from an irradiation light source in a light source according to a modification of the fifth embodiment of the present disclosure. FIG. 28B is a diagram illustrating a spectrum of light emitted from the fluorescent light emitting unit in the light source according to the modification of the fifth embodiment of the present disclosure. FIG. 28C is a diagram illustrating a reflection characteristic of the dichroic mirror in the light source according to the modification of the fifth embodiment of the present disclosure. FIG. 28D is a diagram illustrating a spectrum of emitted light from a light source according to a modification of the fifth embodiment of the present disclosure. FIG. 29 is a diagram illustrating chromaticity coordinates of outgoing light of a light source according to a modification of the fifth embodiment of the present disclosure. FIG. 30 is a schematic diagram showing the configuration of a conventional light source. FIG. 31 is a schematic diagram showing a configuration of a color wheel in a conventional light source.

Hereinafter, the optical conversion element and the light source of the present disclosure will be described based on the embodiments. Note that each of the embodiments described below shows a preferred specific example of the present disclosure. Numerical values, shapes, materials, arrangement methods and usage forms of components shown in the following embodiments are merely examples, and are not intended to limit the present disclosure. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept of the present disclosure are described as optional constituent elements.

Each figure is a schematic diagram and is not necessarily shown strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the same component.

(First embodiment)
Hereinafter, configurations and effects of the optical conversion element and the light source according to the first embodiment of the present disclosure and modifications thereof will be described with reference to FIGS. 1 to 10A and 10B.

FIG. 1 is a diagram illustrating a configuration of a light source 1 according to the first embodiment of the present disclosure. FIG. 2 is a schematic diagram illustrating a configuration of the optical conversion element 50 used in the light source 1 according to the first embodiment of the present disclosure. FIG. 3 is a diagram illustrating a configuration when the light source 1 according to the first embodiment of the present disclosure is used in the image projection apparatus, and an operation explanatory diagram when emitting red, green, and blue fluorescence from the light source 1. FIG. 4 shows the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emission when the seven color sources are generated in a time division manner in the light source 1 according to the first embodiment of the present disclosure. It is an excitation / light emission timing chart of a part 51B.

(Constitution)
As shown in FIG. 1, the light source 1 according to the present embodiment has an optical conversion element 50. As shown in FIG. 2, the optical conversion element 50 includes a rotating body 58 having a rotating shaft 57 and a plurality of fluorescent light emitting units provided on the rotating body 58. The plurality of fluorescent light emitting units in the present embodiment are a first fluorescent light emitting unit 51R, a second fluorescent light emitting unit 51G, and a third fluorescent light emitting unit 51B. The first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B are arranged on a circumference around the rotation shaft 57.

The light source 1 includes a first irradiation light source 10R, a second irradiation light source 10G, and a third irradiation light source 10B. The first light 75R emitted from the first irradiation light source 10R enters the first fluorescent light emitting unit 51R. The second light 75G emitted from the second irradiation light source 10G enters the second fluorescent light emitting unit 51G. The third light 75B emitted from the third irradiation light source 10B enters the third fluorescent light emitting unit 51B. When the first fluorescent light emitting unit 51R receives the first light 75R, it emits red light. When the second fluorescent light emitting unit 51G receives the second light 75G, it emits green light. When the third fluorescent light emitting unit 51B receives the third light 75B, it emits blue light. These red light, green light, and blue light are mixed to form a mixed color light 100, and the mixed color light 100 is emitted from the light source 1.

With this configuration, the light source 1 can emit the mixed color light 100 without using a color wheel having a large occupied area, and the light source 1 can be downsized.

Hereinafter, more specific configurations including optional configurations that are not essential will be described.

In the present embodiment, the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B are, for example, nitride semiconductor lasers, and mainly emit near ultraviolet light. In the present embodiment, it does not matter whether the wavelength ranges of the first light 75R, the second light 75G, and the third light 75B are equal.

2 has the rotating body 58 as described above, and the diameter of the rotating body 58 is, for example, 5 mm to 20 mm. A specific configuration of the optical conversion element 50 is, for example, on the outer peripheral surface of the rotating body 58 that is a cylindrical aluminum alloy rod, the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting device. The part 51B is arranged. The first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B are arranged on a circumference around the rotation shaft 57.

The first fluorescent light emitting unit 51R includes a red phosphor and a binder in which the red phosphor is mixed. The red phosphor is, for example, La ₂ W ₃ O ₁₂ ((La, Eu, Sm) ₂ W ₂ O ₁₂ phosphor) whose main component is activated Eu and Sm. The binder is an organic transparent material such as dimethyl silicone, or an inorganic transparent material such as low-melting glass.

The second fluorescent light emitting unit 51G includes a green phosphor and a binder in which the green phosphor is mixed. For example, the main component of the green phosphor is Ce-activated Y ₃ (Al, Ga) ₅ O ₁₂ . The binder is an organic transparent material such as dimethyl silicone, or an inorganic transparent material such as low-melting glass.

The 3rd fluorescence light emission part 51B has a blue fluorescent substance and the binder with which this blue fluorescent substance was mixed. For example, the main component of the blue phosphor is Eu-activated Sr ₃ MgSi ₂ O ₈ . The binder is an organic transparent material such as dimethyl silicone, or an inorganic transparent material such as low-melting glass.

The thicknesses of the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B are, for example, 100 μm to 1000 μm, and the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, The width of the third fluorescent light emitting unit 51B is 5 mm to 10 mm.

As shown in FIGS. 1 and 2, a rotating shaft 57 is provided at the center of the rotating body 58, and one end of the rotating shaft 57 is held by a bearing 59. The other end of the rotating shaft 57 is fixed to a connecting portion 56 of a rotating mechanism 55 such as a motor. The rotating mechanism 55 rotates the rotating body 58 around the rotating shaft 57.

More specifically, the light source 1 including the optical conversion element 50 is configured as follows.

As shown in FIG. 1, first, the light source 1 includes a first irradiation light source 10R, a second irradiation light source 10G, and a third irradiation light source 10B. The first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B are, for example, semiconductor lasers having an optical output of 2 watts and a central wavelength of emission wavelength in the range of 380 nm to 430 nm. The first irradiation light source 10 R, the second irradiation light source 10 G, and the third irradiation light source 10 B are disposed on the heat sink 90. In the present embodiment, three first irradiation light sources 10R, three second irradiation light sources 10G, and three third irradiation light sources 10B are arranged.

The mounting surface 90 a of the heat sink 90 is disposed in parallel to the rotation shaft 57 of the optical conversion element 50. The first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B are arranged in a matrix on the mounting surface 90a. Further, the heat radiating fins 90b are formed on the surface of the heat sink 90 opposite to the mounting surface 90a. In order to efficiently exhaust heat generated from the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B into the air, the fan 95 is disposed at a position facing the radiation fin 90b. Yes. And between the 1st irradiation light source 10R, the 2nd irradiation light source 10G, the 3rd irradiation light source 10B, and the optical conversion element 50, the collimating lens 20,

1st relay lens

25R, 25G, 25B,

2nd Relay lenses

27R, 27G, 25B, first dichroic mirror 30R, second dichroic mirror 30G, third dichroic mirror 30B, first condenser lens 40R, second condenser lens 40G, third condenser A lens 40B is disposed. At this time, the collimating lens 20 is arranged in a matrix so as to correspond to each of the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B. The other optical components generate red light, green light, and blue light from the excitation light, and correspond to the positions of the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B. Arranged.

The first light 75R emitted from the first irradiation light source 10R is converted into parallel light by the collimating lens 20, and is further passed through the first relay lens 25R that is a convex lens and the second relay lens 27R that is a concave lens. 1 to the dichroic mirror 30R. As shown in FIG. 5C, the first dichroic mirror 30R is set to transmit light with a wavelength of 380 nm to 600 nm and reflect light with a wavelength of 600 nm to 800 nm, for example. On the main optical axis of the first light 75R, the first dichroic mirror 30R, the first condenser lens 40R, and the first fluorescent light emitting unit 51R are arranged in this order. The first light 75R that has passed through the first dichroic mirror 30R is condensed by the first condenser lens 40R and irradiated onto the first fluorescent light emitting unit 51R. At this time, the main optical axis of the first light 75 R collected by the first condenser lens 40 R is orthogonal to the rotation axis 57 of the optical conversion element 50. Similarly, second light 75G emitted from the second irradiation light source 10G is irradiated onto the second fluorescent light emitting unit 51G via the second condenser lens 40G. The third light 75B emitted from the third irradiation light source 10B is irradiated onto the third fluorescent light emitting unit 51B via the third condenser lens 40B.

When the first fluorescent light emitting portion 51R receives the first light 75R, it emits red light, and when the second fluorescent light emitting portion 51G receives the second light 75G, it emits green light, and the third fluorescent light emitting portion. When 51B receives the third light 75B, it emits blue light.

For example, as shown in FIG. 5C, the second dichroic mirror 30G is set to transmit light having a wavelength of 380 nm to 500 nm and reflect light having a wavelength of 500 nm to 800 nm. Further, the third dichroic mirror 30B is set to transmit light with a wavelength of 380 nm to 430 nm and reflect light with a wavelength of 430 nm to 800 nm, for example.

The first dichroic mirror 30R transmits the first light 75R and reflects the red light from the first fluorescent light emitting unit 51R. The second dichroic mirror 30G transmits the second light 75G and reflects the green light from the second fluorescent light emitting unit 51G. The third dichroic mirror 30B transmits the third light 75B and reflects the blue light from the third fluorescent light emitting unit 51B.

On the other hand, the first dichroic mirror 30R transmits blue light and green light. The second dichroic mirror 30G transmits blue light.

For this reason, the red light reflected by the first dichroic mirror 30R, the green light reflected by the second dichroic mirror 30G, and the blue light reflected by the third dichroic mirror 30B have the same optical axis. The mixed color light 100 is synthesized.

(Operation)
Next, the operation of the light source 1 according to the present embodiment will be described using an image projection apparatus 199 including the light source 1 shown in FIG. The image projection apparatus 199 according to the present embodiment includes an image display element 71, a projection lens 65, and the like at the emission portion of the light source 1, and can project an image.

The light source 1 of the present embodiment emits mixed color light 100. The mixed color light 100 includes a red light 78R having a main emission wavelength in the range of 590 to 660 nm, a green light 78G having a main emission wavelength in the range of 500 to 590 nm, and a blue light 78B having a main emission wavelength of 430 to 500 nm. Are synthesized continuously in time. That is, the mixed color light 100 is, for example, white light generated by periodically emitting red light 78R, green light 78G, and blue light 78B, which are light of three primary colors. One period is, for example, about 8.3 ms (120 Hz) during double-speed scanning.

Next, the operation of the light source 1 will be described. The first light 75R emitted from the first irradiation light source 10R becomes one light flux by the collimating lens 20, the first relay lens 25R, and the second relay lens 27R. For example, the first light 75R has a center wavelength of 405 nm and a total light amount of 18 watts. The first light 75R passes through the first dichroic mirror 30R. The first condenser lens 40R condenses the first light 75R on the first fluorescent light emitting unit 51R, for example, with an area of 1 mm ² or less.

The second light 75G emitted from the second irradiation light source 10G becomes one light flux by the collimating lens 20, the first relay lens 25G, and the second relay lens 27G. For example, the second light 75G has a center wavelength of 405 nm and a total light amount of 18 watts. The second light 75G passes through the second dichroic mirror 30G. The second condenser lens 40G condenses the second light 75G on the second fluorescent light emitting unit 51G with an area of 1 mm ² or less, for example.

The third light 75B emitted from the third irradiation light source 10B becomes one light flux by the collimating lens 20, the first relay lens 25B, and the second relay lens 27B. For example, the third light 75B has a central wavelength of 405 nm and a total light amount of 18 watts. The third light 75B passes through the third dichroic mirror 30B. The third condenser lens 40B condenses the third light 75B on the third fluorescent light emitting unit 51B with an area of 1 mm ² or less, for example.

The first light 75R collected by the first condenser lens 40R is converted into red light 78R having a main emission wavelength in the range of 590 nm to 660 nm by the red phosphor included in the first fluorescent light emitting unit 51R. It is converted and enters the first condenser lens 40R. The red light 78R is a Lambertian light distribution whose radiating angle is omnidirectional, but the light emitting area is 1 mm ² or less. Therefore, the first condenser lens 40R can make the red light 78R substantially parallel light. The red light 78R is incident on the first dichroic mirror 30R, most of which is reflected by the first dichroic mirror 30R, and becomes red light 79R. The red light 79 R is incident on the third relay lens 41.

The second light 75G collected by the second condenser lens 40G is converted into green light 78G having a main emission wavelength in the range of 500 nm to 590 nm by the green phosphor contained in the second fluorescent light emitting unit 51G. After being converted, the light enters the second condenser lens 40G. The green light 78G is a Lambertian light distribution whose radiating angle is omnidirectional, but the light emitting area is 1 mm ² or less. Therefore, the second condenser lens 40G can make the green light 78G substantially parallel light. The green light 78G is incident on the second dichroic mirror 30G, most of which is reflected by the second dichroic mirror 30G, and becomes green light 79G. The green light 79 G enters the third relay lens 41.

The third light 75B collected by the third condenser lens 40B is converted into blue light 78B having a main emission wavelength in the range of 430 nm to 500 nm by the blue phosphor included in the third fluorescent light emitting unit 51B. After being converted, the light enters the third condenser lens 40B. The blue light 78B is a Lambertian light distribution whose radiating angle is omnidirectional, but the light emitting area is 1 mm ² or less. Therefore, the third condenser lens 40B can make the blue light 78B substantially parallel light. The blue light 78B is incident on the third dichroic mirror 30B, most of which is reflected by the third dichroic mirror 30B, and becomes blue light 79B. The blue light 79 B is incident on the third relay lens 41.

In the third relay lens 41, the red light 79R, the green light 79G, and the blue light 79B are superimposed to become the mixed color light 100. The mixed color light 100 is condensed on the end of the rod integrator 42 by the third relay lens 41. The mixed color light 100 is multiple-reflected in the rod integrator 42 and is emitted after the light intensity distribution of the wave front is converted into a rectangle. Thereafter, the fourth relay lens 43 turns the mixed-color light 100 into straight light. The mixed color light 100 is guided by a reflection mirror 45 to a reflective image display element 71 such as DMD (Digital Mirror Device). The mixed light 100 irradiated to the image display element 71 is reflected as signal light 80 on which a two-dimensional video signal is superimposed, and is incident on the projection lens 65. The projection lens 65 turns the signal light 80 into image light 89 that can be projected onto a predetermined screen (not shown), and the image light 89 is emitted from the image projection device 199.

Further, a driving method of the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B for generating the mixed color light 100 will be described. FIG. 4 is a diagram illustrating an excitation / light emission timing chart of the fluorescent light emitting unit when the seven color sources are generated in a time division manner in the light source 1 according to the first embodiment of the present disclosure. In the present embodiment, the emitted light in one cycle is switched in the order of blue, green, red, white, cyan, yellow, and black. First, the third irradiation light source 10B that emits the third light 75B is turned on alone. Next, the second irradiation light source 10G that emits the second light 75G is turned on alone. Thereafter, the first irradiation light source 10R that emits the first light 75R is turned on alone. Next, all of the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B are simultaneously turned on. Thereafter, the second irradiation light source 10G and the third irradiation light source 10B are simultaneously turned on. Next, the first irradiation light source 10R and the second irradiation light source 10G are simultaneously turned on. Thereafter, all of the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B are turned off.

By operating in this way, even when there are only three types of fluorescent light emitting units, the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B, the light source 1 has four or more colors. The mixed color light 100 can be emitted. The effect is that the first light 75R corresponding to the first fluorescent light emitting part 51R, the second light 75G corresponding to the second fluorescent light emitting part 51G, and the third light corresponding to the third fluorescent light emitting part 51B. This is an effect that can be obtained because the light 75B can be irradiated independently, and the emission spectrum can be changed more freely than in the conventional structure.

Subsequently, the spectrum and chromaticity coordinates of the mixed-color light 100 emitted from the light source 1 of the present embodiment will be described with reference to FIGS. 5A, 5B, 5C, 5D, and 6. FIG. FIG. 5A shows emission spectra of the first light 75R, the second light 75G, and the third light 75B emitted from the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B. . FIG. 5B shows emission spectra of the red light 78R, the green light 78G, and the blue light 78B emitted from the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B. FIG. 5C shows the wavelength dependence of the reflectivity of the first dichroic mirror 30R, the second dichroic mirror 30G, and the third dichroic mirror 30B. FIG. 5D shows the emission of red light 79R, green light 79G, and blue light 79B that is reflected from the first dichroic mirror 30R, the second dichroic mirror 30G, and the third dichroic mirror 30B and emitted from the light source 1 to the outside. The spectrum is shown. FIG. 5D also shows white mixed light 100W obtained by mixing red light 79R, green light 79G, and blue light 79B. FIG. 6 shows the chromaticity coordinates of the red light 78R, the green light 78G, the blue light 78B, the red light 79R, the green light 79G, the blue light 79B, and the white mixed light 100W, the sRGB standard, and the black body radiation locus.

The first light 75R, the second light 75G, and the third light 75B having an emission wavelength of 405 nm shown in FIG. 5A are converted into red light 78R, green light 78G, and blue light 78B having the spectrum shown in FIG. 5B. . Then, by using the first dichroic mirror 30R, the second dichroic mirror 30G, and the third dichroic mirror 30B having reflection characteristics as shown in FIG. 5C, red light 79R having a spectrum as shown in FIG. 5D. , Green light 79G, blue light 79B, and white mixed light 100W can be emitted.

Furthermore, by using the first dichroic mirror 30R, the second dichroic mirror 30G, and the third dichroic mirror 30B, the emission spectra of the red light 79R, the green light 79G, and the blue light 79B can be cut into a preferable shape. . For example, the green light 78G radiated from the second fluorescent light emitting unit 51G is short wavelength side (wavelength 500 nm or less) and long wavelength side (wavelength 600 nm or more) by the second dichroic mirror 30G and the first dichroic mirror 30R. Are cut and emitted as green light 79G having a higher green purity. This result can be confirmed from the fact that the chromaticity point of the green light 79G moves to the peripheral side with respect to the chromaticity coordinate shown in FIG. These actions are the same for the blue light 78B and the red light 78R. If the blue light 78B, the component on the long wavelength side (wavelength 500 nm or more) is cut, and if the red light 78R is used, the short wavelength side (wavelength 600 nm). The following components are cut and become blue light 79B and 79R with high color purity and emitted from the light source 1. As a result, as shown in FIG. 6, the mixed color light 100 composed of the red light 79R, the green light 79G, and the blue light 79B substantially covers sRGB. In particular, the red light 79R is light having a much higher color purity than sRGB, and is optimal as a light source for an image projection apparatus. The white mixed light 100W shown in FIGS. 5 and 6 is white light having a correlated color temperature of 6000K, which is formed by the sum of red light 79R, green light 79G, and blue light 79B.

(effect)
According to the configuration of the present disclosure, the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B are used as the irradiation light sources. It can be done independently on a time scale on the order of seconds. For this reason, it is possible to generate the three primary colors of RGB in a time-sharing manner without any problem even at a speed higher than double speed scanning (120 Hz, cycle 8.3 ms).

Further, according to the configuration of the present disclosure, switching of the emission state of the red light 79R, the green light 79G, and the blue light 79B is performed regardless of the rotation speed of the optical conversion element 50, the first irradiation light source 10R, the second irradiation light source. Control can be performed only by switching between the ON state and the OFF state of 10G and the third irradiation light source 10B. Therefore, a mechanism such as controlling the rotation speed of the optical conversion element 50 to a constant rotation speed is unnecessary, and a light source capable of switching the emission color of the mixed color light 100 can be realized by a simple method. . With this configuration, the light source 1 can emit the mixed color light 100 without using a color wheel having a large occupied area, and the light source 1 can be downsized.

In addition, according to the present disclosure, the first fluorescent light emitting unit 51R including the red fluorescent material, the second fluorescent light emitting unit 51G including the green fluorescent material, and the third fluorescent light emitting unit 51B including the blue fluorescent material. Can be rotated by the same rotation mechanism 55. For this reason, it is possible to generate RGB three primary colors with high efficiency and high speed with a compact configuration, and it is possible to provide a high-performance light source 1 without color breakup.

In the above-described configuration, the above-described phosphor is used as the phosphor. For example, blue phosphors include Eu-activated (Ba, Sr) MgAl ₁₀ O ₁₇ phosphors represented by Eu-activated BaMgAl ₁₀ O _{17 and the} like, as well as Eu-activated (Sr, Ca, Ba, Mg) ₁₀ , (PO ₄ ) ₆ _Cl2 phosphor may be used. The green phosphors are Eu-activated β-type SiAlON phosphor, Eu-activated SrSiO ₃ phosphor, Eu-activated SrSi ₂ O ₂ N ₂ phosphor, Eu-activated Ba ₃ Si ₈ O ₁₂ N ₂ phosphor, and Ce-activated CaSc _2. A phosphor in which Ce or Eu is activated, such as an O ₄ phosphor, may be used.

The red phosphor is not limited to Eu and Sm activated La ₂ W ₃ O ₁₂ . The red phosphor includes, for example, at least one of silicon oxide, tungsten oxide, molybdenum oxide, indium oxide, yttrium oxide, zinc oxide, silicon nitride, silicon oxynitride, aluminum oxynitride, and organic polymer. It may be a phosphor contained in the constituent elements of the material. The base material contains a lanthanoid ion element or a metal ion element as an activator. The red phosphors are Eu activated La ₂ O ₂ S phosphor, Eu activated LiW ₂ O ₈ phosphor, Eu and Sm activated LiW ₂ O ₈ phosphor, Eu and Mn activated (Sr, Ba) ₃ MgSi ₂ O ₈ fluorescence Body, Mn activated 3.5MgO · 0.5MgF ₂ · GeO ₂ phosphor, Eu activated YVO ₄ phosphor, Eu activated Y ₂ O ₃ phosphor, Eu activated Y ₂ O ₂ S phosphor, etc. Is preferably a narrow phosphor.

The red phosphor may be a rare earth complex phosphor using a lanthanoid ion element or a metal ion element as an activator. The rare earth complex phosphor has a molecular structure in which, for example, two types of phosphine oxide are coordinated to trivalent europium.

In the present embodiment, a semiconductor laser having a center wavelength of 405 nm is given as an example of the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B, but this is not restrictive. The center wavelengths of the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B can be adjusted in the range of 380 nm to 430 nm according to the absorption spectrum of the phosphor in the optical conversion element 50. In addition, when one irradiation light source includes a plurality of semiconductor lasers having different center wavelengths in the range of 2 nm to 10 nm, the wavelength spectrum width can be widened.

(Modification 1)
Next, a first modification of the optical conversion element according to the first embodiment will be described with reference to FIGS. 7A and 7B. This modification is different from the first embodiment in the configuration of the optical conversion element 50B. For this reason, in this modification, it demonstrates focusing on a different part from 1st Embodiment using the enlarged view of the fluorescence light emission part 51 vicinity. 7A and 7B, the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B in FIG. 7A shows a cross section parallel to the rotation axis of the optical conversion element 50B, and FIG. 7B shows a cross section perpendicular to the rotation axis of the optical conversion element 50B.

In the optical conversion element 50B of this modification, a transparent body 60 is formed on the outer peripheral side of the fluorescent light emitting unit 51 of the optical conversion element 50 of the first embodiment.

Specifically, as shown in FIG. 7B, a substantially cylindrical rotating body 58 is provided on the circumference centering on the rotation shaft 57, and a transparent body is provided on the outer peripheral side of the rotating body 58. 60 is formed. The transparent body 60 is made of, for example, low-melting glass that transmits light having a wavelength of 380 nm to 800 nm.

With this configuration, the wavelength-converted light 78 emitted from the fluorescent light emitting portion 51 in all directions is refracted at the interface between the transparent body 60 and air. As a result, as shown in FIG. 7B, the emission divergence angle of the wavelength-converted light 78 in the plane perpendicular to the rotation shaft 57 can be reduced. Therefore, it becomes possible for the wavelength converted light 78 to enter the first condenser lens 40R, the second condenser lens 40G, and the third condenser lens 40B shown in FIG. 1 more efficiently.

As described above, by using the configuration of this modified example, the emission divergence angle of the wavelength converted light 78 originally emitted by the Lambertian light distribution can be reduced, and the utilization efficiency of the wavelength converted light 78 can be increased.

(Modification 2)
Subsequently, a second modification of the light source conversion element according to the first embodiment will be described with reference to FIGS. 8A and 8B. 8A and 8B are enlarged views of the vicinity of the fluorescent light emitting unit 51 in FIG. 1, FIG. 8A is a cross section parallel to the rotation axis 57 of the optical conversion element 50C, and FIG. A cross section perpendicular to the shaft 57 is shown. As can be seen from a comparison between FIG. 8A and FIG. 7A, in this modification, the cross-sectional shape of the transparent body 60C is different from the cross-sectional shape of the transparent body 60 of the first modification.

As shown in FIG. 8A, the transparent body 60C of this modification has a cross section parallel to the rotation shaft 57 that is convex toward the outer periphery. More specifically, the transparent body 60 C desirably has a parabola (quadratic curve) shape in a cross section parallel to the rotation shaft 57. With this configuration, the wavelength-converted light 78 emitted from the fluorescent light-emitting unit 51 in all directions is refracted at the interface between the transparent body 60C and air. As a result, as shown in FIGS. 8A and 8B, the emission divergence angle of the wavelength-converted light 78 can be reduced on both the plane parallel to the rotation axis 57 and the plane perpendicular to the rotation axis 57. Therefore, the wavelength converted light 78 can enter the first condenser lens 40R, the second condenser lens 40G, and the third condenser lens 40B shown in FIG. 1 more efficiently.

As described above, by using the configuration of this modified example, it is possible to reduce the emission divergence angle of the wavelength-converted light 78 that is originally emitted by the Lambertian light distribution, and to increase the use efficiency of the wavelength-converted light.

Next, a method for manufacturing the transparent body 60C and the optical conversion element 50C in the second modification will be described with reference to FIGS. 9A, 9B, 9C, and 9D. First, as shown in FIG. 9A, for example, low-melting glass 102 is poured into a lens mold 101, and a glass lens 103 having a hollow portion 61 as shown in FIG. 9B is molded. The glass lens 103 has a parabolic shape in a cross section parallel to the rotation shaft 57. Next, as shown in FIG. 9C, a dispersion liquid 104 in which phosphor particles are dispersed in liquid silicone is prepared and set in the syringe of the syringe 105. Furthermore, as shown in FIG. 9D, after inserting the rotating body 58 into the hollow portion 61 of the glass lens 103, the dispersion liquid 104 is inserted into the gap formed between the hollow portion 61 and the rotating body 58 using the syringe 105. Fill. Further, by performing heat treatment at 150 ° C., the fluorescent light emitting part 51 can be formed between the transparent body 60 and the rotating body 58.

With this configuration, the wavelength-converted light 78 emitted from the fluorescent light emitting portion 51 in all directions is refracted at the interface between the transparent body 60C and air. As a result, as shown in FIG. 8B, the emission divergence angle of the wavelength-converted light 78 on the surface perpendicular to the rotation shaft 57 and the surface parallel to the rotation shaft 57 can be reduced. Therefore, the wavelength converted light 78 can enter the first condenser lens 40R, the second condenser lens 40G, and the third condenser lens 40B shown in FIG. 1 more efficiently.

(Modification 3)
Next, a third modification of the light source conversion element according to the first embodiment will be described with reference to FIGS. 10A and 10B. 10A and 10B show enlarged views of the vicinity of the fluorescent light emitting portion of FIG. 1, and FIG. 10A shows a cross section parallel to the rotation axis 57 of the optical conversion element 50D. FIG. 10B shows a cross section perpendicular to the rotation shaft 57 of the optical conversion element 50D. In this modification, an antireflection film 70 made of, for example, a dielectric film is provided on the transparent body 60. The refractive index of the antireflection film 70 is preferably set as shown by the following equation, where n is the refractive index of the transparent body 60.

The film thickness of the antireflection film 70 is preferably set as shown by the following formula.

By using the configuration of this modification, the antireflection film 70 reduces the reflection loss when the excitation light 75 is incident on the transparent body 60, so that the intensity of the wavelength converted light 78 per power of the excitation light 75 is further increased. It becomes possible to raise.

In addition, although the structure which provides the antireflection film 70 on the transparent body 60 was demonstrated in this modification, you may form the antireflection film 70 directly on the fluorescence light emission part 51. FIG. In that case, it is preferable that the refractive index of the antireflection film 70 is set as shown by the following equation, where n2 is the refractive index of the fluorescent light emitting portion 51.

The thickness of the antireflection film 70, if the peak emission wavelength of the fluorescent light-emitting section 51 and the lambda _p, preferably set as shown by the following equation.

In the present modification, the antireflection film 70 has a single layer structure, but may have a multilayer structure.

(Second Embodiment)
Next, an optical conversion element 50E according to the second embodiment will be described with reference to FIG. In the present embodiment, a description will be given focusing on portions of the configuration of the optical conversion element 50E that are different from the first embodiment.

In the optical conversion element 50E of the present embodiment, a cooling mechanism 92 is formed in a part of the rotating body 58.

Specifically, as shown in FIG. 11, a cooling mechanism 92 is provided in the vicinity of the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B. More specifically, for example, blades made of an aluminum alloy or the like are attached as a cooling mechanism 92 to the outer peripheral portion of the rotating body 58 made of an aluminum alloy or the like. A plurality of blades as the cooling mechanism 92 constitutes the propeller fan. When the optical conversion element 50 E is operating, the cooling mechanism 92 rotates together with the rotating body 58, so that the cool air 93 is generated by the rotation of the cooling mechanism 92. The cold air 93 passes through the surfaces of the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B, and the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B. The fluorescent light emitting unit 51B is cooled. Further, a part of the heat generated in the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B is transferred into the air by using the rotating body 58 and the cooling mechanism 92 as a heat dissipation path 94. Heat is dissipated.

By using the configuration of the present disclosure as described above, the heat generated in the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B can be efficiently cooled. It is possible to suppress a decrease in fluorescence intensity due to a temperature rise in the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B.

In the present embodiment, three cooling mechanisms 92 are illustrated, but depending on the degree of heat generation of the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B, the cooling mechanism is shown. The number of 92 may be changed.

(Modification 1)
Subsequently, Modification 1 of the present embodiment will be described with reference to FIGS. In this modification, the configuration of the optical conversion element 50F is different from the configuration described above. In the present modification, the configurations and arrangements of the first dichroic mirror 30R, the second dichroic mirror 30G, and the third dichroic mirror 30B are different from those in the first embodiment. In this modification, the first relay lens and the second relay lens are omitted.

In this modification, the optical conversion element 50F includes a rotating shaft 57 and three rotating bodies 58 provided on the rotating shaft 57. The rotating body 58 is made of, for example, an aluminum alloy. The rotating body 58 is integrally formed with blades as the cooling mechanism 92. Then, the first fluorescent light emitting portion 51R, the second fluorescent light emitting portion 51G, and the third fluorescent light emitting portion 51B are formed on the side surface of the outermost peripheral portion of the rotating body 58. And the transparent body 60F is arrange | positioned on the surface of the 1st fluorescence light emission part 51R, the 2nd fluorescence light emission part 51G, and the 3rd fluorescence light emission part 51B. The cross section of the transparent body 60F is preferably semicircular or parabolic in a cross section parallel to the rotation axis 57.

The first fluorescent light emitting unit 51R includes, for example, a red phosphor whose main component is Eu-activated (Sr, Ca) AlSiN ₃ and a transparent material in which the red phosphor is mixed. The second fluorescent light emitting unit 51G includes, for example, a green phosphor whose main component is Ce-activated Y ₃ (Al, Ga) ₅ O ₁₂ and a transparent material in which the green phosphor is mixed. For example, the third fluorescent light emitting unit 51B includes a blue phosphor whose main component is Eu-activated Sr ₃ MgSi ₂ O ₈ and a transparent material in which the blue phosphor is mixed.

In the light source 1F of the present modification, the third fluorescent light emitting unit 51B that emits blue light 78B, the second fluorescent light emitting unit 51G that emits green light 78G, in order from the side closer to the emitting unit of the mixed color light 100, blue A first fluorescent light emitting portion 51R that emits light 78B is disposed. The third dichroic mirror 30B that emits the blue light 79B, the second dichroic mirror 30G that emits the green light 79G, and the first dichroic that emits the blue light 79B, in order from the side closer to the emission part of the mixed color light 100. A mirror 30R is arranged.

First, the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B emit the first light 75R, the second light 75G, and the third light 75B. The first light 75R, the second light 75G, and the third light 75B are laser light having a center wavelength of 405 nm, for example. The first light 75R, the second light 75G, and the third light 75B pass through the first dichroic mirror 30R, the second dichroic mirror 30G, and the third dichroic mirror 30B, and the first condenser lens. The light is condensed by 40R, the second condenser lens 40G, and the third condenser lens 40B. The first light 75R, the second light 75G, and the third light 75B are the red light 78R and the green light 78G in the first fluorescent light emitting part 51R, the second fluorescent light emitting part 51G, and the third fluorescent light emitting part 51B. , Converted into blue light 78B. The red light 78R, the green light 78G, and the blue light 78B are reflected by the first dichroic mirror 30R, the second dichroic mirror 30G, and the third dichroic mirror 30B, and become red light 79R, green light 79G, and blue light 79B.

FIG. 13A shows emission spectra of the first light 75R, the second light 75G, and the third light 75B. FIG. 13B shows emission spectra of red light 78R, green light 78G, and blue light 78B. FIG. 13C shows the reflection characteristics of the first dichroic mirror 30R, the second dichroic mirror 30G, and the third dichroic mirror 30B. FIG. 13D shows emission spectra of red light 79R, green light 79G, and blue light 79B.

The optical conversion element 50 F includes a rotating shaft 57 and three rotating bodies 58 provided on the rotating shaft 57. A first fluorescent light emitting unit 51R, a second fluorescent light emitting unit 51G, and a third fluorescent light emitting unit 51B are mounted on the outer peripheral side of the three rotating bodies 58. A blade that is a cooling mechanism 92 is formed between the rotating shaft 57 of the rotating body 58 and the outer peripheral portion. The rotating body 58 is made of, for example, an aluminum alloy, and is formed integrally with, for example, a blade. Further, a transparent body 60F having a semicircular cross section is formed on the surface side of the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B. The heat generated in the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B is transmitted to the cooling mechanism 92, and by the rotation of the cooling mechanism 92 accompanying the rotation of the rotating body 58, Heat is discharged from the cooling mechanism 92. Further, the red light 78R, the green light 78G, and the blue light 78B emitted from the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B are emitted as a Lambertian light distribution. However, the directivity in the light distribution direction is improved by the transparent body 60F. The first condenser lens 40R, the second condenser lens 40G, and the third condenser lens 40B turn the red light 78R, the green light 78G, and the blue light 78B into parallel lights. The red light 78R, the green light 78G, and the blue light 78B are reflected by the first dichroic mirror 30R, the second dichroic mirror 30G, and the third dichroic mirror 30B having the reflection characteristics shown in FIG. 13C, and the red light 79R. , Green light 79G and blue light 79B. As shown in FIG. 14, the blue light 78B becomes high-purity blue light 79B from which light having a wavelength of 500 nm or more is cut, and the green light 78G has purity obtained by cutting light having a wavelength of 500 nm or less and light having a wavelength of 590 nm or more. Green light 79G, and red light 78R becomes high-purity red light 79R from which light having a wavelength of 590 nm or less is cut. The red light 79R, the green light 79G, and the blue light 79B are mixed and become the mixed color light 100.

By using the configuration of this modification, the heat generated in the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B can be efficiently exhausted, and the first It is possible to suppress a decrease in fluorescence intensity due to a temperature rise of the fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B. As a result, the light source 1F can be configured with a compact configuration, and the high-mixed color light 100 can be emitted from the light source 1F. Further, by using the first dichroic mirror 30R, the second dichroic mirror 30G, and the third dichroic mirror 30B, high-purity red light 79R, green light 79G, and blue light 79B that are optimal for a display or the like are emitted. be able to.

(Modification 2)
Subsequently, Modification 2 of the present embodiment will be described with reference to FIGS. 15 to 17. In the present modification, the configuration of the optical conversion element 50G constituting the light source 1G is different from the configuration described above.

The optical conversion element 50G of the present modification has a first rotating body 58R provided on the first rotating shaft 57R and a first fluorescent light emitting section 51R provided on the outer periphery of the first rotating body 58R. . Further, the optical conversion element 50G includes a second rotating body 58G provided on the second rotating shaft 57G, and a second fluorescent light emitting section 51G provided on the outer periphery of the second rotating body 58G. Furthermore, the optical conversion element 50G includes a third rotating body 58B provided on the third rotating shaft 57B and a third fluorescent light emitting section 51B provided on the outer periphery of the third rotating body 58B.

The first rotating body 58R, the second rotating body 58G, and the third rotating body 58B are provided with blades as the cooling mechanism 92. The cooling mechanism 92 includes a first rotating shaft 57R and a first fluorescent light emitting unit 51R in the first rotating body 58R, and a second rotating shaft 57G and a second fluorescent light emitting unit in the second rotating body 58G. 51G and between the third rotating shaft 57B and the third fluorescent light emitting unit 51B in the third rotating body 58B. The cooling mechanism 92 rotates with the rotation of the first rotating body 58R, the second rotating body 58G, and the third rotating body 58B.

By using the configuration of this modification, the heat generated in the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B can be efficiently cooled, and the first fluorescent light emitting unit 51G can be efficiently cooled. It is possible to suppress a decrease in fluorescence intensity due to a temperature rise of the light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B. As a result, the light source 1G can be realized with a compact configuration, and the high-luminance mixed color light 100 can be emitted from the light source 1G. In the present modification, the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B are arranged while the thickness of the light source 1G is kept thin as shown in FIG. The size of the first rotating body 58R, the second rotating body 58G, and the third rotating body 58B can be increased. In addition, the size of the cooling mechanism 92 can be increased while keeping the thickness of the light source 1G thin. As a result, it is possible to achieve both high luminance and thinning of the light source 1G.

In the optical conversion element 50G of this modification, as shown in FIG. 17, the first rotating body 58R, the second rotating body 58G, and the third rotating body 58B are configured by three first gears 64A. It is preferable that the adjacent first gears 64A are connected by the second gear 64B. By adopting such a configuration, the number of rotating mechanisms that rotate the first rotating body 58R, the second rotating body 58G, and the third rotating body 58B can be reduced, and a more compact light source 1G is realized. be able to.

In the optical conversion element 50G of this modification, a transparent body may be formed on the surfaces of the first fluorescent light emitting part 51R, the second fluorescent light emitting part 51G, and the third fluorescent light emitting part 51B.

(Third embodiment)
Next, a light source 1H according to the third embodiment will be described with reference to FIGS. The light source 1H of the present embodiment is different from the first embodiment in the configuration of the fluorescent light emitting unit and the irradiation light source of the optical conversion element 50H. Hereinafter, the description will focus on the different parts of the light source 1H and the light source 1.

In the optical conversion element 50H of the present embodiment, the position where the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B are formed on the rotating body 58, and the phosphor excitation. The number of optical axes is different from that of the first embodiment.

Specifically, as shown in FIG. 19, a rotating body 58 having a rotating shaft 57, a first fluorescent light emitting section 51R, a second fluorescent light emitting section 51G, and a third fluorescent light provided on the outer periphery of the rotating body 58. The fluorescent light emitting part 51B. The first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B are arranged on a circumference around the rotation axis 57. In the present embodiment, the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B are arranged on three arcs divided on one circumference. ing.

By using the configuration of the present embodiment, the optical conversion element 50H can be configured more compactly. Furthermore, since the irradiation light source can be composed of only the first irradiation light source 10 and the optical axis of the irradiation light source can be reduced from three axes to one axis, a light source component, specifically a collimating lens, a relay lens, etc. It is possible to achieve significant simplification, downsizing, and energy saving.

In the present embodiment, the first fluorescent light emitting part 51R, the second fluorescent light emitting part 51G, and the third fluorescent light emitting part 51B are configured to be divided into three arcs on one circumference. However, another phosphor such as a yellow phosphor may be added and the light source 1H may have three or more color sources.

(Modification 1)
A modification of the light source according to the third embodiment will be described with reference to FIGS. The light source 1I according to this modification is different from the first embodiment in the configuration of the fluorescent light emitting unit and the irradiation light source of the optical conversion element 50I.

In this modification, the optical conversion element 50I includes a rotating body 58 having a rotating shaft 57. The rotating body 58 has blades as the cooling mechanism 92, and the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B are formed on the outer periphery of the rotating body 58. The

Furthermore, in this modification, the heat sink 90 that fixes the first irradiation light source 10 is thermally connected to the rotating body 58 by a heat transport member 99 that is a heat pipe, for example. Specifically, the cold air 93 sent by the cooling mechanism 92 passes through the surface of the heat transport member 99. With this configuration, the heat generated in the first irradiation light source 10 is transmitted to the heat sink 90 and the heat transport member 99, and the heat generated in the first irradiation light source 10 can be cooled by the cold air 93.

By using the configuration of this modification, the heat generated in the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B can be efficiently cooled. As a result, it is possible to suppress a decrease in fluorescence intensity due to a temperature rise in the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B. Further, the heat generated by the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, the third fluorescent light emitting unit 51B, and the first irradiation light source 10 is cooled by the common cooling mechanism 92.

(Fourth embodiment)
Next, configurations and effects of the light source and the optical conversion element according to the fourth embodiment will be described with reference to FIG. The light source 1J of the present embodiment is different from the first embodiment in the configuration of the optical conversion element and the irradiation light source. For this reason, it demonstrates centering on the different part of both.

The optical conversion element 50J of the present embodiment has a moving mechanism 62 that changes the position of the rotating body 58 in the axial direction of the rotating shaft 57.

The first fluorescent light emitting portion 51R, the second fluorescent light emitting portion 51G, and the third fluorescent light emitting portion 51B are formed adjacent to each other on the outer peripheral surface of the rotating body 58. And the irradiation light source consists of the 1st irradiation light source 10, and the optical axis of an irradiation light source is one.

In the present embodiment, the rotating body 58 is rotated by the rotating mechanism 55 when the optical conversion element 50J is operating. The rotation mechanism 55 is a DC motor, for example. The rotational speed of the rotating body 58 is, for example, 10,000 rpm. Then, the moving mechanism 62 vibrates the rotating body 58 in the axial direction of the rotating shaft 57, for example, at 180 hertz. The excitation light 75 emitted from the first irradiation light source 10 is irradiated to the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B at a constant cycle. As a result, red light 79R whose main emission wavelength is in the range of 590 to 660 nm, green light 79G whose main emission wavelength is in the range of 500 to 590 nm, and blue light 79B whose main emission wavelength is in the range of 430 to 500 nm, Are emitted in a time-sharing manner and become the mixed-color light 100.

By using the configuration of this embodiment, the number of optical axes can be reduced from three to one, and as a result, the light source can be reduced in size and energy can be saved.

In the present embodiment, the fluorescent light emitting units are the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B. However, the fluorescent light emitting unit is a yellow phosphor or the like. It is good also as a structure which has fluorescent substance other than RGB, and the source color of the mixed-color light 100 is four or more.

(Modification)
Next, a modification of the light source according to the fourth embodiment will be described with reference to FIG. The light source 1K according to this modification is different from the above-described configuration in the configuration of the optical conversion element 50K.

The optical conversion element 50K of the present modification includes a columnar rotating body 58 having a rotating shaft 57. A rotating mechanism 55 is connected to the rotating shaft 57 and rotates the rotating body 58. The rotating body 58 has blades as the cooling mechanism 92. On the outer peripheral surface of the rotator 58, a first fluorescent light emitting part 51R, a second fluorescent light emitting part 51G, and a third fluorescent light emitting part 51B are formed adjacent to each other. And the moving mechanism 62 is connected with the rotary body 58 via the piston movable part (not shown). The moving mechanism 62 includes a pin 62a, a connecting rod 62b, a pin 62c, and a motor 62d connected to the piston movable portion. In the moving mechanism 62, the rotational motion in the motor 62d is converted into vertical motion by the connecting rod 62b.

In this modification, the rotating body 58 is rotated by the rotating mechanism 55 when the optical conversion element 50K is operating. The rotational speed of the rotating body 58 is, for example, 10,000 rpm. The moving mechanism 62 vibrates the rotating body 58 in the axial direction of the rotating shaft 57, for example, at 180 hertz. The excitation light 75 emitted from the first irradiation light source 10 is irradiated to the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B at a constant cycle. Red light 79R whose main emission wavelength is in the range of 590 to 660 nm, green light 79G whose main emission wavelength is in the range of 500 to 590 nm, and blue light 79B whose main emission wavelength is in the range of 430 to 500 nm, The light is emitted in a divided manner and becomes mixed color light 100.

By using the optical conversion element 50K of this modification, it is possible to realize the light source 1K that emits the mixed color light 100 with an optical system having a simple configuration.

In addition, by using the configuration of this modification, the heat generated in the first fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B can be efficiently cooled, and the first It is possible to suppress a decrease in fluorescence intensity due to a temperature rise in the fluorescent light emitting unit 51R, the second fluorescent light emitting unit 51G, and the third fluorescent light emitting unit 51B.

Furthermore, in the present modification, the rotating body 58 can be rotated within the formation surface of the rotating body 58, so that the light source 1K can be configured to be very thin.

(Fifth embodiment)
Hereinafter, the configurations and effects of the optical conversion element and the light source according to the fifth embodiment of the present disclosure and the modifications thereof will be described with reference to FIGS. 24, 25, 26 A, 26 B, 26 C, 26 D, and 27. I will explain.

FIG. 24 is a schematic diagram showing a configuration of a light source according to the present embodiment. FIG. 25 is an operation explanatory diagram when the light source according to the present embodiment is used in an image projection apparatus. 26A, FIG. 26B, FIG. 26C, and FIG. 26D show the spectrum of the emitted light from the light source according to this embodiment, and FIG. 27 shows the chromaticity coordinates and the like of the emitted light from the light source according to this embodiment. Show.

(Constitution)
In the light source 1L according to the fifth embodiment of the present disclosure, the third light 75B emitted from the third irradiation light source 10B is blue light, and the main wavelength of the third light 75B is from 430 nm. The range is up to 480 nm. The light source 1L does not include the third fluorescent light emitting unit 51B and the third condenser lens 40B shown in FIG. The light source 1L uses the third light 75B emitted from the third irradiation light source 10B as it is as a blue light source.

A more specific configuration of the light source 1L of the present embodiment will be described below.

As shown in FIG. 24, the light source 1L includes a first irradiation light source 10R, a second irradiation light source 10G, and a third irradiation light source 10B. The first irradiation light source 10R and the second irradiation light source 10G are semiconductor lasers having an optical output of, for example, 2 watts and a central wavelength of the emission wavelength in the range of 380 nm to 430 nm. The third irradiation light source 10B is a semiconductor laser having a central wavelength of emission wavelength in the range from 430 nm to 480 nm.

In FIG. 24, three each of the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B are arranged, but the number is not limited. The first light 75R emitted from the first irradiation light source 10R is red, such as Eu or Sm activated La ₂ W ₃ O ₁₂ phosphor, in the same procedure as described in the first embodiment. The light is condensed on the first fluorescent light emitting portion 51R including the fluorescent material. The second light 75G emitted from the second irradiation light source 10G is, for example, Ce activated (Lu, Y) ₃ (Ga, Al) ₅ O in the same procedure as described in the first embodiment. _The light is condensed on the second fluorescent light emitting unit 51G including a green fluorescent material such as ₁₂ fluorescent materials.

The main optical axes of the first light 75R and the second light 75G collected by the first condenser lens 40R and the second condenser lens 40G are relative to the axial direction of the rotation shaft 57 of the optical conversion element 50L. It is installed so that it is incident vertically. The light emitted from the third irradiation light source 10B becomes parallel light by the collimating lens 20, and further passes through the first relay lens 25B which is a convex lens and the second relay lens 27B which is a concave lens, and the third mirror 31B. Led to.

Here, the third mirror 31B is set to reflect light having a wavelength of 430 to 480 nm, for example. Therefore, after the blue light 76B, which is the third light 75B emitted from the third irradiation light source 10B, is reflected by the third mirror 31B, it is superimposed on the red light 79R and the green light 79G, and the mixed light 100 It becomes.

Further, as shown in FIG. 26C, for example, the second dichroic mirror 30G transmits light having a wavelength of 380 nm to 500 nm and reflects light having a wavelength of 500 nm to 800 nm. For example, the first dichroic mirror 30R transmits light having a wavelength of 380 nm to 600 nm and reflects light having a wavelength of 600 nm to 800 nm.

The third mirror 31B may be a dichroic mirror or a simple reflection mirror as long as it reflects light with a wavelength of 430 nm to 480 nm.

(Operation)
Next, the operation of the light source 1L according to the present embodiment will be described using an image projection device 199 including the light source 1L and an emission spectrum shown in FIGS.

The light source 1L of the present embodiment includes so-called red light 79R having a main emission wavelength in the range of 590 to 660 nm, so-called green light 79G having a main emission wavelength in the range of 500 to 590 nm, and a main emission wavelength of 430 nm. The mixed color light 100 which is output in a time division manner with the blue light 76B in the range of 480 nm is emitted. That is, the mixed-color light 100 is, for example, white light obtained by periodically emitting red light 79R, green light 79G, and blue light 76B, which are light of three primary colors. One cycle is, for example, about 8.3 ms (120 Hz) during double-speed scanning.

Next, the operation of the light source 1L will be described. For example, the first light 75R having a central wavelength of 405 nm and a total light amount of 18 watts emitted from the first irradiation light source 10R becomes one light flux by the collimating lens 20, the first relay lens 25R, and the second relay lens 27R. . The first light 75R passes through the first dichroic mirror 30R and is condensed to an area of 1 mm ² or less in the first fluorescent light emitting unit 51R by the first condenser lens 40R. The condensed first light 75R has a main emission wavelength from 590 nm to 660 nm due to, for example, a red phosphor, which is Eu, Sm activated La ₂ W ₃ O ₁₂ phosphor, included in the first fluorescence emission part 51R. Is converted into red light 78R.

For example, the second light 75G having a center wavelength of 405 nm and a total light amount of 18 watts emitted from the second irradiation light source 10G becomes one light flux by the collimating lens 20, the first relay lens 25G, and the second relay lens 27G. . The second light 75G passes through the second dichroic mirror 30G and is condensed to an area of 1 mm ² or less in the second fluorescent light emitting unit 51G by the second condenser lens 40G. The condensed second light 75G is converted into green light 78G by the green phosphor included in the second fluorescent light emitting unit 51G.

The emission angle of the red light 78R is omnidirectional, and the red light 78R is light emitted by a Lambertian light distribution. However, since the emission region of the red light 78R is a point light source of 1 mm ² or less, the first condenser lens 40R can make the red light 78R substantially parallel light. The red light 78R is incident on the first dichroic mirror 30R. Then, the red light 78R is reflected by the first dichroic mirror 30R, becomes red light 79R, and enters the third relay lens 41.

Similarly, the second condenser lens 40G can make the green light 78G substantially parallel light. The green light 78G is incident on the second dichroic mirror 30G. Then, the green light 78G is reflected by the second dichroic mirror 30G, becomes green light 79G, and enters the third relay lens 41.

The third light 75B emitted from the third irradiation light source 10B becomes one light flux by the collimating lens 20, the first relay lens 25B, and the second relay lens 27B. The third light 75B is reflected by the third mirror 31B and becomes blue light 76B. The blue light 76 B is incident on the third relay lens 41.

The red light 78R, the green light 78G, and the blue light 76B are superimposed in the third relay lens 41 to become the mixed color light 100. The mixed color light 100 is collected by the third relay lens 41 and enters the end of the rod integrator 42. The mixed color light 100 is multiple-reflected in the rod integrator 42, and the light intensity distribution of the wave front is converted into a rectangle. Thereafter, the mixed color light 100 is radiated from the rod integrator 42 and is converted into straight light by the fourth relay lens 43. The mixed color light 100 that has become straight-ahead light is reflected by the reflection mirror 45 and enters a reflective image display element 71 such as a DMD, for example. The mixed color light 100 irradiated to the image display element 71 becomes signal light 80 on which a two-dimensional video signal is superimposed in the image display element 71 and is reflected by the image display element 71. The signal light 80 is converted into video light 89 that can be projected onto a predetermined screen (not shown) by the projection lens 65. Thereafter, the image light 89 is emitted from the image projection device 199.

The above operation will be described with reference to emission spectra shown in FIGS. 26A, 26B, 26C, and 26D. As shown in FIG. 26A, the spectrum of the first light 75R emitted from the first irradiation light source 10R and the spectrum of the second light 75G emitted from the second irradiation light source 10G are the same. The spectrum of the third light 75B emitted from the third irradiation light source 10B is different from the spectrum of the first light 75R and the second light 75G.

FIG. 26B shows the spectrum of red light 78R and green light 78G. The red light 78R is light obtained by converting the wavelength of the first light 75R by the first fluorescent light emitting unit 51R, and the green light 78G is obtained by converting the wavelength of the second light 75G by the second fluorescent light emitting unit 51G. The blue light 78B is light obtained by wavelength conversion of the third light 75B by the third fluorescent light emitting unit 51B.

FIG. 26C is a diagram showing the reflection characteristics of the first dichroic mirror 30R and the second dichroic mirror 30G.

FIG. 26D shows the spectrum of red light 79R, green light 79G, and blue light 76B. The blue light 76B is light that is reflected by the third mirror 31B without wavelength conversion of the third light 75B. The red light 79R is light obtained by reflecting the red light 78R to the first dichroic mirror 30R. As shown in FIG. 27, the color purity of the red light 79R is higher than the color purity of the red light 78R. From this result, it can be seen that the first dichroic mirror 30R extends the color reproduction range of the mixed color light 100. The green light 79G is light obtained by reflecting the green light 78G to the second dichroic mirror 30G. As shown in FIG. 27, the color purity of the green light 79G is higher than the color purity of the green light 78G. From this result, it can be seen that the second dichroic mirror 30G extends the color reproduction range of the mixed-color light 100.

(effect)
According to the configuration of the present disclosure, since the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B are used, there is no problem even at a speed of double speed scanning (120 Hz, cycle 8.3 ms) or more. The light source 1L can emit the three primary colors of RGB in a time division manner. The reason is that the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B can be switched between the on state and the off state on a time scale of nanosecond order. .

In addition, according to this configuration, the first irradiation light source having the excitation wavelength for the first fluorescent light emitting unit 51R, the excitation wavelength of the green phosphor for the second fluorescent light emitting unit 51G, and the wavelength of the blue light 76B, respectively. The irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B can be selected. For this reason, the luminous efficiency of the phosphor can be improved, and a high-luminance light source can be realized.

With this configuration, the light source 1L capable of emitting the RGB three primary colors in a time-sharing manner with high efficiency and high speed can be realized with a compact configuration.

In addition, the fluorescent substance which can be used in this Embodiment is not restricted to the above-mentioned thing. For example, as the green phosphor, Eu activated β-type SiAlON phosphor, Eu activated SrSiO ₃ phosphor, Eu activated SrSi ₂ O ₂ N ₂ phosphor, Eu activated Ba ₃ Si ₈ O ₁₂ N ₂ phosphor, Ce activated A phosphor activated with Ce or Eu, such as a CaSc ₂ O ₄ phosphor, can be used. The red phosphor is not limited to Eu and Sm activated La ₂ W ₃ O ₁₂ . For example, as a red phosphor, one or more of silicon oxide, tungsten oxide, molybdenum oxide, indium oxide, yttrium oxide, zinc oxide, silicon nitride, silicon oxynitride, aluminum oxynitride, and organic polymer is a mother substance. It may be a phosphor contained in the constituent elements of the material. As an activator for the base material, a lanthanoid ion element or a metal ion element is contained. Specific examples of the red phosphor include Eu activated La ₂ O ₂ S phosphor, Eu activated LiW ₂ O ₈ phosphor, Eu and Sm activated LiW ₂ O ₈ phosphor, Eu and Mn activated (Sr, Ba) ₃ MgSi ₂ O ₈ phosphor, Mn activated 3.5 MgO · 0.5 MgF ₂ .GeO ₂ phosphor, Eu activated YVO ₄ phosphor, Eu activated Y ₂ O ₃ phosphor, Eu activated Y ₂ O ₂ S phosphor, etc. It is done. These phosphors are phosphors having a narrow half-width of the fluorescence spectrum, and are effective in the present embodiment. Moreover, the red phosphor may be a rare earth complex phosphor using a lanthanoid ion element or a metal ion element as an activator. Specific examples of red phosphors include rare earth complex phosphors having a molecular structure in which two types of phosphine oxides are coordinated to trivalent europium.

In the present embodiment, a semiconductor laser having a center wavelength of 450 nm is given as an example of the first irradiation light source 10R and the second irradiation light source 10G, but this is not restrictive. For example, the center wavelengths of the first irradiation light source 10R and the second irradiation light source 10G are in the range of 430 nm to 480 nm in accordance with the absorption spectra of the phosphors in the first fluorescent light emitting unit 51R and the second fluorescent light emitting unit 51G. You may adjust with. Alternatively, the first irradiation light source 10R and the second irradiation light source 10G may be configured by combining a plurality of semiconductor lasers. In that case, the wavelength spectrum width can be widened by adopting a configuration in which the center wavelengths of the plurality of semiconductor lasers are different within a range of 2 nm to 10 nm.

In addition, as an example of the first irradiation light source 10R and the second irradiation light source 10G, a semiconductor laser having a center wavelength of 405 nm is mentioned, but this is not restrictive. For example, the center wavelengths of the first irradiation light source 10R and the second irradiation light source 10G are in the range of 380 nm to 430 nm in accordance with the absorption spectra of the phosphors in the first fluorescent light emitting unit 51R and the second fluorescent light emitting unit 51G. You may adjust with. Alternatively, the first irradiation light source 10R and the second irradiation light source 10G may be configured by combining a plurality of semiconductor lasers. In that case, the wavelength spectrum width can be widened by adopting a configuration in which the center wavelengths of the plurality of semiconductor lasers are different within a range of 2 nm to 10 nm.

(Modification)
Subsequently, a modification of the present embodiment will be described with reference to FIGS. 28A, 28B, 28C, 28D, and 29. FIG. In the present modification, the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B are made of the same material, and their emission wavelengths are between 430 nm and 480 nm. In the present modification, the first fluorescent light emitting unit 51R has a phosphor that converts blue light into red light, and the second fluorescent light emitting unit 51G converts blue light into green light. Has a phosphor.

The operation of this modification will be described using the emission spectra shown in FIGS. 28A, 28B, 28C, and 28D.

As shown in FIG. 28A, the first irradiation light source 10R emits the first light 75R. The second irradiation light source 10G emits the second light 75G. The third irradiation light source 10B emits third light 75B. The wavelengths of the first light 75R, the second light 75G, and the third light 75B are equal.

FIG. 28B shows the spectra of red light 78R and green light 78G. The red light 78R is light obtained by converting the wavelength of the first light 75R by the first fluorescent light emitting unit 51R, and the green light 78G is obtained by converting the wavelength of the second light 75G by the second fluorescent light emitting unit 51G. Light. The phosphor included in the first fluorescent light emitting portion 51R is an Eu activated (Sr, Ca) AlSiN ₃ phosphor. The phosphor included in the second fluorescent light emitting unit 51G is Ce-activated (Lu, Y) ₃ (Ga, Al) ₅ O ₁₂ phosphor.

FIG. 28C is a diagram showing the reflection characteristics of the first dichroic mirror 30R and the second dichroic mirror 30G.

FIG. 28D shows the spectrum of red light 79R, green light 79G, and blue light 76B. The blue light 76B is light that is reflected by the third mirror 31B without wavelength conversion of the third light 75B. The red light 79R is light obtained by reflecting the red light 78R to the first dichroic mirror 30R. As shown in FIG. 29, the color purity of the red light 79R is higher than the color purity of the red light 78R. From this result, it can be seen that the first dichroic mirror 30R extends the color reproduction range of the mixed color light 100. The green light 79G is light obtained by reflecting the green light 78G to the second dichroic mirror 30G. As shown in FIG. 29, the color purity of the green light 79G is higher than the color purity of the green light 78G. From this result, it can be seen that the second dichroic mirror 30G extends the color reproduction range of the mixed-color light 100.

In the present modification, the first irradiation light source 10R, the second irradiation light source 10G, and the third irradiation light source 10B can be configured as one type, so that the light source 1L can be realized more easily.

The light source of the present disclosure is a light source that emits light emitted from an irradiation light source after being converted into fluorescence by a plurality of phosphors, and can emit mixed color light without using a color wheel. Therefore, the light source of the present disclosure can be widely used not only for display illumination such as a projector, a rear projection television, and a head-up display, but also for in-vehicle illumination such as a headlight or medical illumination such as an endoscope. it can.

1, 1F, 1G, 1H, 1I, 1J, 1K, 1L Light source 10, 10R First irradiation light source 10G Second irradiation light source 10B Third irradiation light source 20 Collimating lenses 25R, 25G, 25B First relay lens 27R 27G, 27B Second relay lens 30R First dichroic mirror 30G Second dichroic mirror 30B Third dichroic mirror 31B Third mirror 40R First condenser lens 40G Second condenser lens 40B Third Condensing lens 41 Third relay lens 42 Rod integrator 43 Fourth relay lens 45 Reflective mirrors 50, 50B, 50C, 50D, 50E, 50F, 50G, 50H, 50I, 50J, 50K, 50L Optical conversion element 51 Fluorescent light emission Part 51R First fluorescent light emitting part 51G Second fluorescent light emitting 51B 3rd fluorescence light emission part 55 Rotation mechanism 56 Connection part 57 Rotating shaft 57R 1st rotating shaft 57G 2nd rotating shaft 57B 3rd rotating shaft 58 Rotating body 58R 1st rotating body 58G 2nd rotating body 58B Third rotating body 59 Bearing 60, 60C, 60F Transparent body 61 Hollow portion 62 Movement mechanism 64A First gear 64B Second gear 65 Projection lens 70 Antireflection film 71 Image display element 75 Excitation light 75R First light 75G Second light 75B Third light 76B Blue light 78 Wavelength converted light 78R Red light 78G Green light 78B Blue light 79R Red light 79G Green light 79B Blue light 80 Signal light 89 Video light 90 Heat sink 92 Cooling mechanism 95 Fan 99 Heat transport MEMBER 100, 100W MIXED LIGHT 199 IMAGE PROJECTION DEVICE

Claims

A rotating body having a rotation axis;
A plurality of fluorescent light emitting units provided on the rotating body,
The plurality of fluorescent light emitting units includes a first fluorescent light emitting unit and a second fluorescent light emitting unit,
An optical conversion element in which the first fluorescent light emitting unit and the second fluorescent light emitting unit are arranged on a circumference around the rotation axis.
The plurality of fluorescent light emitting units further includes a third fluorescent light emitting unit,
The optical conversion element according to claim 1, wherein the third fluorescent light emitting unit is disposed on a circumference centered on the rotation axis.
The optical conversion element according to claim 1, further comprising a transparent body disposed on the plurality of fluorescent light emitting units.
A rotating mechanism for rotating the rotating body around the rotating shaft;
A cooling mechanism provided on the rotating body,
The optical conversion element according to claim 1.
Further comprising an antireflection film provided on the outermost surface of the rotating body,
The antireflection film prevents reflection of light in a wavelength region from 380 nm to 700 nm;
The optical conversion element according to claim 1.
A moving mechanism for changing the position of the rotating body in the axial direction of the rotating shaft;
The optical conversion element according to claim 1.
The optical conversion element according to claim 1;
A first irradiation light source for irradiating the optical conversion element with first light;
A second irradiation light source for irradiating the optical conversion element with second light;
A third irradiation light source that emits third light;
With
When the first fluorescent light emitting unit receives the first light, it emits red light;
When the second fluorescent light emitting unit receives the second light, it emits green light,
A light source that mixes and emits the red light, the green light, and the third light.
The light source according to claim 7, wherein the third light is blue light.
The first light is incident on the optical conversion element from a direction perpendicular to the axial direction of the rotation axis;
The light source according to claim 7, wherein the second light is incident on the optical conversion element from a direction perpendicular to an axial direction of the rotation axis.
A first dichroic mirror disposed between the first irradiation light source and the optical conversion element;
A second dichroic mirror disposed between the second irradiation light source and the optical conversion element;
The light source according to claim 7, further comprising:
A third mirror for receiving third light from the third irradiation light source;
The first dichroic mirror transmits the first light and reflects the red light;
The second dichroic mirror transmits the second light and reflects the green light;
The light source according to claim 10, wherein the third mirror reflects the third light.
A first condenser lens disposed between the first dichroic mirror and the optical conversion element;
The light source according to claim 10, further comprising: a second condenser lens disposed between the second dichroic mirror and the optical conversion element.
The optical conversion element according to claim 2;
A first irradiation light source for irradiating the optical conversion element with first light;
A second irradiation light source for irradiating the optical conversion element with second light;
A third irradiation light source for irradiating the optical conversion element with third light;
With
When the first fluorescent light emitting unit receives the first light, it emits red light;
When the second fluorescent light emitting unit receives the second light, it emits green light,
When the third fluorescent light emitting unit receives the third light, it emits blue light,
A light source that mixes and emits the red light, the green light, and the blue light.
The first light is incident on the optical conversion element from a direction perpendicular to the axial direction of the rotation axis;
The second light is incident on the optical conversion element from a direction perpendicular to the axial direction of the rotation axis;
The light source according to claim 13, wherein the third light is incident on the optical conversion element from a direction perpendicular to an axial direction of the rotation axis.
A first dichroic mirror disposed between the first irradiation light source and the optical conversion element;
A second dichroic mirror disposed between the second irradiation light source and the optical conversion element;
A third dichroic mirror disposed between the third irradiation light source and the optical conversion element;
The light source according to claim 13, further comprising:
The first dichroic mirror transmits the first light and reflects the red light;
The second dichroic mirror transmits the second light and reflects the green light;
The light source according to claim 15, wherein the third dichroic mirror transmits the third light and reflects the blue light.
A first condenser lens disposed between the first dichroic mirror and the optical conversion element;
A second condenser lens disposed between the second dichroic mirror and the optical conversion element;
A third condenser lens disposed between the third dichroic mirror and the optical conversion element;
The light source according to claim 15, further comprising:
The optical conversion element according to claim 2, wherein the first fluorescent light emitting unit, the second fluorescent light emitting unit, and the third fluorescent light emitting unit are arranged on the same circumference.
The optical conversion element according to claim 18,
A first irradiation light source for irradiating the optical conversion element with first light;
With
When the first fluorescent light emitting unit receives the first light, it emits red light;
When the second fluorescent light emitting unit receives the first light, it emits green light,
When the third fluorescent light emitting unit receives the first light, it emits blue light,
A light source that mixes and emits the red light, the green light, and the blue light.
A dichroic mirror disposed between the first irradiation light source and the optical conversion element;
The first dichroic mirror transmits the first light;
The light source according to claim 19, wherein the first dichroic mirror reflects the red light, the green light, and the blue light.