WO2019193760A1

WO2019193760A1 - Light source device

Info

Publication number: WO2019193760A1
Application number: PCT/JP2018/014791
Authority: WO
Inventors: カールピーターウェルナ; 高橋　幸司
Original assignee: シャープ株式会社
Priority date: 2018-04-06
Filing date: 2018-04-06
Publication date: 2019-10-10

Abstract

A light source device (2) comprises: an excitation light source (11) that emits excitation light (8); a phosphor (3) that has formed therein an excitation region (9) where the phosphor (3) is excited by the excitation light (8) emitted from the excitation light source (11) and white light (10) is diffused therefrom; and a specular reflection member (4) that is formed along the peripheral edge of the excitation region (9) and that reflects the excitation light (8) in a specular manner.

Description

Light source device

The present invention relates to a light source device including a light source that emits excitation light and a phosphor light-emitting unit that is excited by excitation light emitted from the light source and emits light having a color different from that of the excitation light.

In a light source device that emits light of a color different from the excitation light (for example, white) by exciting the phosphor light emitting portion with the excitation light emitted from the excitation light source, the excitation light is excited at the periphery of the excitation region where the phosphor light emitting portion is excited by the excitation light. A configuration is known in which a member that does not contain a phosphor (for example, a “mask” that covers the periphery of the phosphor light-emitting portion) is formed along the periphery of the excitation region so as to obtain a clear contrast (patent) References 1-3). The member that does not include the phosphor formed along the periphery of the excitation region does not necessarily need to be a mask that covers the periphery of the phosphor light emitting portion, and some member that does not include the phosphor is provided on the outermost surface. However, in the present specification, members that do not include a phosphor formed along the periphery of the excitation region are collectively referred to as a “mask”. Therefore, in the present specification, the “mask” includes both a member that covers (masks) the phosphor light-emitting portion and a member that is installed beside the phosphor light-emitting portion.

The masks described in

Patent Documents

1 and 2 absorb excitation light emitted from an excitation light source. The mask described in Patent Document 3 diffusely reflects the excitation light emitted from the excitation light source.

It should be noted that the portion expressed as “color” in this specification can be read as “wavelength”.

International Patent Publication “2017/154807 (published September 14, 2017)” Japanese Patent Publication “JP 2011-181381 (released on September 15, 2011)” International Patent Publication “2017/068765 (April 27, 2017)”

However, the masks that absorb the excitation light described in

Patent Documents

1 and 2 cannot absorb 100% of the excitation light. Therefore, excitation light scattered by the mask is generated. For this reason, there is a problem that the excitation light scattered by the mask is superimposed on white light emitted from the phosphor light emitting section or becomes stray light.

Since the mask described in Patent Document 3 diffuses and reflects the excitation light, the diffused excitation light is superimposed on the light emitted from the phosphor light emitting unit, as in the masks described in

Patent Documents

1 and 2. There is a problem of becoming stray light.

An object of the present invention is to provide a light source device in which stray light caused by diffusion of excitation light is suppressed while obtaining a light source (for example, a white light source) having a clear contrast at the outer edge.

In order to achieve the above object, a light source device according to the present invention includes a light source that emits excitation light and excitation that emits light of a color (for example, white) that is excited by the excitation light emitted from the light source and is different from the excitation light. A phosphor light-emitting unit having a region formed thereon and a mask formed along the periphery of the excitation region to regularly reflect the excitation light.

According to one embodiment of the present invention, it is possible to provide a light source device in which stray light due to diffusion of excitation light is suppressed while obtaining a light source (for example, a white light source) having a clear contrast at the outer edge.

1 is a schematic perspective view of a light source device according to Embodiment 1. FIG. It is a schematic diagram of the said light source device. 6 is a schematic diagram of a light source device according to Embodiment 2. FIG. It is the figure which looked at the said light source device from the direction of arrow A shown by FIG. It is sectional drawing of the light source device which concerns on Embodiment 3. FIG. It is sectional drawing of the light source device which concerns on Embodiment 4. FIG. 10 is a schematic diagram of a light source device according to Embodiment 5. FIG. 10 is a schematic diagram of another light source device according to Embodiment 5. FIG. 10 is a schematic diagram of a light source device according to Embodiment 6. FIG.

(Embodiment 1)
FIG. 1 is a schematic perspective view of a light source device 2 according to the first embodiment. FIG. 2 is a schematic diagram of the light source device 2. The light source device 2 includes an excitation light source 1 (light source) and a wavelength conversion element 5. The excitation light source 1 emits excitation light 8 toward the wavelength conversion element 5. The wavelength conversion element 5 includes a phosphor light emitting unit 3 and a mask 4 (regular reflection member). The phosphor light emitting section 3 is composed of a phosphor that is a substance that emits fluorescence, and is formed by thinning the phosphor. Moreover, the fluorescent substance light emission part 3 is a member containing a fluorescent substance, and may be a member obtained by processing it into plate shape.

The phosphor light emitting unit 3 is excited by the excitation light emitted from the excitation light source 1, and light (fluorescence) having a color different from that of the excitation light is emitted from the phosphor light emitting unit 3. The light (fluorescence) emitted from the phosphor light emitting unit 3 and the excitation light emitted from the excitation light source 1 can be mixed to obtain, for example, white.

The mask 4 is formed on the phosphor light emitting unit 3 and has an opening 16 exposing the surface of the phosphor light emitting unit 3. The surface of the phosphor light emitting portion 3 exposed through the opening 16 corresponds to the excitation region 9.

In the excitation region 9, the phosphor is excited by the excitation light 8 emitted from the excitation light source 1 and white light 10 is emitted. The mask 4 is formed along the periphery of the excitation region 9 and regularly reflects the excitation light 8.

The mask 4 regularly reflects 90% or more of the components of the excitation light 8 irradiated to the mask 4. The excitation region 9 excites the phosphor light emitting unit 3 with the excitation light 8 emitted from the excitation light source 1 and emits white light 10 from the excitation region 9 of the opening 16 bordered by the mask 4 of the phosphor light emitting unit 3. discharge. The phosphor light emitting unit 3 is arranged such that the surface normal of the phosphor light emitting unit 3 is inclined by the incident angle θ1 with respect to the optical axis of the excitation light 8 emitted from the excitation light source 1.

The dimension of the opening 16 formed in the mask 4 is set to a desired white light source dimension (excitation region 9). The excitation light 8 emitted from the excitation light source 1 is incident on the excitation light incident area 13 including the excitation area 9 obliquely at an incident angle θ1 (> 0). The excitation light 8 incident on the excitation region 9 excites the phosphor light emitting unit 3, thereby emitting white light 10. On the other hand, the excitation light 8 incident on the mask 4 disposed in the excitation light incident area 13 outside the excitation area 9 is specularly reflected by the mask 4 in a controlled manner. The excitation light 8 incident on the mask 4 is reflected according to the law of regular reflection in which the incident angle and the reflection angle are equal.

In this specification, “regular reflection” means reflection with the same incident angle and reflection angle.

The shape of the opening 16 formed in the mask 4 may be circular, square, rectangular, or any other shape. The dimension of the opening 16 is preferably smaller than 1 mm.

The cross-sectional shape of the excitation light 8 can be circular, square, rectangular, or any other shape. The shape of the opening 16 of the mask 4 and the cross-sectional shape of the excitation light 8 may be different. The intensity distribution of the excitation light 8 may or may not be uniform in its cross section.

(Embodiment 2)
FIG. 3 is a schematic diagram of a light source device 2A according to the second embodiment. FIG. 4 is a view of the light source device 2A viewed from the direction of the arrow A shown in FIG. The same reference numerals are assigned to the components described in the above-described embodiments, and detailed description thereof will not be repeated.

The light source device 2 described in the first embodiment is a reflective light source device, but the light source device 2A according to the second embodiment is a transmissive light source device. In this specification, as shown in FIG. 2, the reflection-type light source device is a light source device in which the incident surface of the excitation light 8 and the main emission surface of the fluorescence (white light 10) are the same with respect to the phosphor light emitting unit 3. Means. As shown in FIG. 3, the transmissive light source device means a light source device in which the incident surface of the excitation light 8 with respect to the phosphor light emitting unit 3 and the main emission surface of the fluorescence (white light 10) face each other. And

A mask 4 is provided on the phosphor light emitting unit 3. An opening 16 that exposes the excitation region 9 of the phosphor light emitting unit 3 is formed in the mask 4. As shown in FIG. 3, the excitation light 8 enters the phosphor light emitting unit 3 perpendicularly from the mask 4 side. The excitation light 8 that has entered the opening 16 that exposes the excitation region 9 excites the phosphor light emitting unit 3, and the white light 10 is emitted from the phosphor light emitting unit 3 toward the side opposite to the mask 4. On the other hand, the excitation light 8 incident on the mask 4 in the excitation light incident area 13 outside the excitation area 9 is regularly reflected by the mask 4 and returns in a direction opposite to the incident direction.

In both the reflection type light source device and the transmission type light source device, the incident angle θ1 of the excitation light 8 to the phosphor light emitting unit 3 can be any angle between 0 ° and 90 °.

The surface characteristics of the mask 4 are reflective, and most of the power of the excitation light 8 incident on the mask 4 is regularly reflected. In general, surface reflection characteristics exist from perfect mirror-type specular reflection to complete diffuse reflection. That is, specular reflection and diffuse reflection can occur simultaneously on the surface.

Here, when diffuse reflection on the mask 4 outside the excitation region 9 occurs, how much color change the diffuse reflection light of the excitation light 8 gives to the white light emitted from the phosphor light emitting unit 3. It is possible to consider how much diffuse reflection on the mask 4 needs to be suppressed. That is, a necessary ratio can be derived as a regular reflection component of the excitation light 8 at the mask 4.

When the excitation light 8 enters the excitation region 9, the phosphor light emitting unit 3 is excited and white light 10 is emitted from the excitation region 9. Here, the white light 10 is a mixture of the light from which the excitation light 8 is scattered in the excitation region 9 and the fluorescence emitted from the phosphor light emitting unit 3. It is assumed that the excitation light 8 is blue light having a wavelength of 450 nm and the phosphor light emitting unit 3 is Ce: YAG (Yttrium Aluminum Garnet) emitted in a yellow region. The correlated color temperature (CCT) changes according to the ratio between the excitation light 8 having a wavelength of 450 nm and the emission of yellow Ce: YAG.

When it is desired to adjust the correlated color temperature to an intended value, the mixing ratio of the excitation light 8 and fluorescence becomes a problem when the excitation light 8 is scattered on the mask 4. That is, when the excitation light 8 scattered on the mask 4 is present, the scattered excess excitation light 8 is superimposed on the white light 10 having a desired correlated color temperature emitted from the excitation region 9. The color temperature changes, making control difficult. In the present application, the reflective mask 4 according to the present embodiment having specular reflectivity solves the problem that the color temperature changes.

The conditions necessary for regular reflection of the excitation light 8 on the surface of the mask 4 are quantified as follows. This quantification can be performed from the viewpoint of reducing the variation in the color coordinates of the emission color.

In the chromaticity management of light emitting elements such as the phosphor light emitting section 3, the range of color change that cannot be distinguished by human eyes is expressed by MacAdam ellipses. There is an index called “STEP” in the unit indicating the size of the MacAdam ellipse on the chromaticity diagram, and it can be said that the smaller the “STEP” value, the smaller the color variation. The color change in the range of 1 STEP in the McAdam ellipse cannot be identified by the human eye. In manufacturing a light emitting element, the color variation is often managed so as to fall within the range of 3 STEP.

In order to evaluate the influence of regular reflection of the excitation light 8 on the mask 4, it is first necessary to consider the influence of the overlapping region between the excitation light 8 and the mask 4. The overlapping region is a region on the reflection surface of the mask 4 on which the excitation light 8 is incident. For example, when the excitation region 9 having a square shape and the excitation light 8 having a square cross section are used, when the dimension of the excitation region 9 is 500 μm × 500 μm, the sectional size of the excitation light 8 is It is calculated by the dimension of 9 and the dimension which adds the protrusion value from the excitation area 9. This protrusion value is shown below together with an overlap value which is a ratio of the protrusion value in the size of the excitation light 8.

The protrusion value is a small number compared to the dimension of the excitation region 9 of 500 μm × 500 μm. However, as the overlap value increases, the amount of emitted fluorescence decreases proportionally. When the overlap value is 10%, only 90% of the excitation light 8 is used, and 10% means that it does not contribute to wavelength conversion in the phosphor light emitting unit 3. For this reason, it is necessary to consider the manufacturing tolerance for the protrusion value while minimizing the overlap value. The maximum overlap value is realistically 10%.

The above-mentioned overlap value and regular reflectance of the reflecting surface of the mask 4 and the degree of color temperature deviation that diffuse reflection on the mask 4 gives to the chromaticity of the white light 10 emitted from the phosphor light-emitting unit 3 It can be expressed by the number of STEPs.

Here, it is assumed that the power of the excitation light 8 is 5 W and the optical emission efficiency is 250 lm / W. In Table 2, “regular reflectance%” indicates the proportion of the regular reflection component when the excitation light 8 is reflected by the mask 4.

The conclusion will be explained below. When the overlap value is 0%, diffuse reflection at the mask 4 does not occur, so the color temperature of the white light 10 from the phosphor light emitting unit 3 does not change. For this reason, when the overlap value is 0%, the specular reflectance of the mask 4 is not affected and there is no influence of the diffusely reflected light on the mask 4, so the change in the color temperature of the white light 10 from the phosphor light emitting unit 3 is Macadam's. Fits within 1 STEP. When the overlap value is 2%, no change in color temperature is given to the light emission of the white light 10 from the phosphor light emitting unit 3 when the regular reflection is 100%. This is because the excitation light 8 does not scatter at all in the emission direction of the fluorescence from the phosphor light emitting unit 3. If the regular reflectance decreases, the amount of scattering of the excitation light 8 at the mask 4 increases in inverse proportion. At 90% regular reflectance, 10% is scattered. For this reason, the ratio of the excitation light 8 scattered by the mask 4 to the white light 10 obtained by adding the excitation light 8 to the fluorescence from the phosphor light emitting unit 3 is increased, and the excitation light 8 having a wavelength of 450 nm on the chromaticity diagram. Is added, and the light emitted from the phosphor light-emitting unit 3 appears more blueish white. The larger the overlap value, the stronger the color temperature shift caused by the superimposition of the blue excitation light 8 on the color coordinate. For this reason, it is important that the regular reflectance of the mask 4 is higher as the overlap value is larger. If a maximum overlap value of 10% is allowed within 3 STEP of the MacAdam ellipse, the specular reflectance must be 90% or higher.

Strictly speaking, a part of the excitation light 8 incident on the mask 4 is absorbed by the mask 4, and the remainder of the excitation light 8 is reflected (regular reflection or diffuse reflection) by the mask 4. In the above (Table 2), the absorption of the excitation light 8 by the mask 4 is not considered. That is, the regular reflectance of 90% or more means that 90% or more of the remaining excitation light 8 to be reflected is regularly reflected by the mask 4 except for absorption.

(Embodiment 3)
FIG. 5 is a cross-sectional view of the light source device 2B according to the third embodiment. The same reference numerals are assigned to the components described in the above-described embodiments, and detailed description thereof will not be repeated.

The mask 4 may be disposed on the phosphor light emitting unit 3. The phosphor light emitting unit 3 is disposed on the substrate 18. The mask 4 is disposed on the phosphor light emitting unit 3, and an opening 16 that exposes the excitation region 9 of the phosphor light emitting unit 3 is formed in the mask 4.

The substrate 18 is made of a material having thermal conductivity (for example, aluminum) and has a reflective surface facing the phosphor light emitting unit 3.

The phosphor light emitting unit 3 can be made of Ce: YAG. The mask 4 can be made of a metal or an inorganic material. It is very important that the surface of the mask 4 has a high regular reflectance.

The mask 4 shown in FIG. 5 is a member that covers or surrounds the surface of the phosphor light emitting unit 3 by being attached to or adhered to the phosphor light emitting unit 3. It is preferable that the manufacturing process of the phosphor light emitting unit 3 includes a polishing process for flattening the surface, or some flattening process. The excitation light 8 can be incident on the polished phosphor light emitting section 3 at a Brewster angle to improve the incident efficiency.

The light source device 2B shown in FIG. 5 is used as a reflective light source device in which the excitation light 8 enters the excitation region 9 of the phosphor light emitting unit 3 from the mask 4 side.

(Embodiment 4)
FIG. 6 is a cross-sectional view of the light source device 2C according to the fourth embodiment. The same reference numerals are assigned to the components described in the above-described embodiments, and detailed description thereof will not be repeated.

As shown in FIG. 6, the mask 4 is disposed on the substrate 18 so as to surround the phosphor light emitting unit 3 on the substrate 18, and has an opening 19 in which the phosphor light emitting unit 3 is buried. Note that the mask 4 in FIG. 6 does not cover the surface of the phosphor light-emitting unit 3 but is a member placed beside the phosphor light-emitting unit 3. Express.

First, the mask 4 shown in FIG. 6 is attached on, placed on, or adhered to the substrate 18. Thereafter, the phosphor light emitting section 3 is buried in the opening 19 of the mask 4.

The light source device 2C shown in FIG. 6 can be used as a reflective light source device in which the excitation light 8 enters the excitation region 9 of the phosphor light emitting unit 3 from the mask 4 side if the substrate 18 is opaque. On the other hand, if the substrate 18 is transparent, in addition to being used as a reflective light source device, it can also be used as a transmissive light source device in which excitation light 8 enters the excitation region 9 of the phosphor light emitting unit 3 from the substrate 18 side. .

(Embodiment 5)
FIG. 7 is a schematic diagram of a light source device 2D according to the fifth embodiment. The same reference numerals are assigned to the components described in the above-described embodiments, and detailed description thereof will not be repeated.

The light source device 2D further includes an absorbing member 17 that absorbs the excitation light 8 regularly reflected by the mask 4. When the excitation light 8 is regularly reflected by the mask 4, the excitation light 8 leaves the phosphor light emitting unit 3 in a controlled manner. Then, the reflected excitation light 8 is absorbed by the absorbing member 17 disposed at a position away from the phosphor light emitting unit 3.

This absorption can be done in two ways. First, there is a method of absorbing the excitation light 8 only for the purpose of terminating the excitation light 8, and a method of absorbing with a photodetector for the purpose of monitoring the behavior of the excitation light 8. The termination method / utilization method of the excitation light 8 specularly reflected by the mask 4 may be selected depending on the application in which it is mounted.

A mirror may be disposed in front of the absorbing member 17 to change the traveling direction of the excitation light 8 regularly reflected by the mask 4.

FIG. 8 is a schematic diagram of another light source device 2E according to the fifth embodiment. The same reference numerals are assigned to the components described in the above-described embodiments, and detailed description thereof will not be repeated.

The light source device 2E further includes a reflecting member 11 that reflects the excitation light 8 specularly reflected by the mask 4 toward the excitation region 9 of the phosphor light emitting unit 3. When the excitation light 8 is regularly reflected by the mask 4, the excitation light 8 leaves the phosphor light emitting unit 3 in a controlled manner. Then, the reflected excitation light 8 is reflected by the reflecting member 11 and returned onto the excitation region 9 of the phosphor light emitting unit 3 as shown in FIG. In order to improve the light emission efficiency in the phosphor light emitting unit 3, the excitation light 8 specularly reflected by the mask 4 is returned by the reflecting member 11 onto the excitation region 9 of the phosphor light emitting unit 3 and recycled.

The reflection surface of the reflection member 11 may be a flat surface, a curved surface, or a special shape. The reflection member 11 is disposed at a position where the excitation light 8 is reflected on the excitation region 9 of the phosphor light emitting unit 3 and not on the reflection surface of the mask 4.

A mirror may be disposed in front of the reflecting member 11 to change the traveling direction of the reflected excitation light 8.

(Embodiment 6)
FIG. 9 is a schematic diagram of a light source device 2F according to the sixth embodiment. The same reference numerals are assigned to the components described in the above-described embodiments, and detailed description thereof will not be repeated.

The light source device 2F further includes a parabolic member 12 that reflects the white light 10 emitted from the phosphor light emitting unit 3. The light source device 2F can be used for a headlight of an automobile using the excitation light 8 and the phosphor light emitting unit 3. The semiconductor laser diode emits excitation light 8 having a wavelength of about 450 nm, and the excitation light 8 is collected via the focus lens 15 on the excitation region 9 of the phosphor light emitting unit 3 on which the mask 4 is formed. White light 10 emitted from the excitation region 9 is projected far away by a reflective parabolic member 12. The excitation light 8 is regularly reflected toward the absorbing member 17 outside the opening 16 of the mask 4. The opening 16 is a 0.5 mm × 0.5 mm square. The reflective mask 4 is a 1 mm × 1 mm square.

The effect of using the reflective mask 4 is that the excitation light 8 that diffuses and becomes stray light without contributing as the white light 10 is reliably driven out of the parabolic member 12 and safely terminated. For example, when the mask 4 causing scattering reflection is used, the parabolic member 12 picks up and projects the scattered excitation light 8. As a result, a non-uniform color distribution occurs in the projection pattern.

(Summary)
The light source device (2, 2A to 2F) according to the first aspect of the present invention includes a light source (excitation light source 1) that emits excitation light (8) and excitation light (8) emitted from the light source (excitation light source 1). The phosphor light emitting part (3) in which an excitation region (9) from which white light (10) is emitted by being excited by is formed, and the excitation light (8) formed along the periphery of the excitation region (9) And a regular reflection member (mask (4)) having a regular reflection surface.

According to the above configuration, the excitation light incident on the regular reflection member formed along the periphery of the excitation region is regularly reflected by the regular reflection member. For this reason, unlike the prior art in which the excitation light incident on the regular reflection member is scattered and diffused by the regular reflection member, the problem that the excitation light is mixed with white light and becomes stray light is reduced. As a result, it is possible to provide a light source device that obtains white light with a clear outer edge, has no stray light, and is excellent in color uniformity and controllability.

In the light source device (2, 2A to 2F) according to aspect 2 of the present invention, in the aspect 1, the regular reflection member (mask (4)) is 90% of the components of the excitation light (8) reflected. % Or more is preferably specularly reflected.

According to the above configuration, the diffusion component of the reflected excitation light component is reduced as compared with the prior art. For this reason, the stray light based on the diffusion component of excitation light is reduced.

In the light source device (2, 2B to 2F) according to aspect 3 of the present invention, in the aspect 1, the excitation region (9) emits the excitation light (8) mainly from an incident surface of the excitation light. It is preferable to diffusely reflect.

According to the above configuration, white light including a component obtained by diffusing and reflecting excitation light can be obtained.

In the light source device (2A) according to aspect 4 of the present invention, in the aspect 1, it is preferable that the excitation region (9) transmits a part of the excitation light (8).

According to the above configuration, white light that transmits a part of the excitation light can be obtained.

The light source device (2, 2A, 2B, 2D to 2F) according to aspect 5 of the present invention is the above-described aspect 1, wherein the regular reflection member (mask (4)) is disposed on the phosphor light emitting unit (3). Preferably, it has an opening (16) that is disposed and exposes the excitation region (9).

According to the above configuration, the excitation region can be formed with a simple configuration.

In the light source device (2C) according to aspect 6 of the present invention, in the above aspect 1, the regular reflection member (mask (4)) is disposed so as to surround the phosphor light emitting part (3), and the phosphor light emission It is preferable to have an opening (19) in which the part (9) is filled.

According to the above configuration, it can be used as a reflective light source device or a transmissive light source device.

In the light source device (2, 2D to 2F) according to aspect 7 of the present invention, in the above aspect 1, the phosphor light emitting section (3) is perpendicular to the optical axis with respect to the optical axis of the excitation light (8). It is preferable to be disposed around an inclination axis.

According to the above configuration, the incident direction of the excitation light can be made different from the emission direction of the excitation light regularly reflected by the regular reflection member, so that processing at the reflection destination of the excitation light regularly reflected by the regular reflection member can be performed. It becomes easy.

The light source device (2D) according to aspect 8 of the present invention further includes an absorption member (17) that absorbs the excitation light (8) specularly reflected by the regular reflection member (mask (4)) in the above aspect 1. It is preferable.

According to the above configuration, the excitation light regularly reflected by the regular reflection member can be processed so as not to be mixed with white light.

The light source device (2E) according to the ninth aspect of the present invention reflects the excitation light (8) specularly reflected by the regular reflection member (mask (4)) toward the excitation region (9) in the first aspect. It is preferable to further include a reflecting member (11).

According to the above configuration, the excitation light regularly reflected by the regular reflection member can be reflected toward the excitation region and reused as white light.

The light source device (2F) according to aspect 10 of the present invention preferably further includes a parabolic member (12) that reflects the white light (10) emitted from the phosphor light emitting unit (3) in the aspect 1. .

According to the above configuration, it is possible to project the white light emitted from the phosphor light emitting portion in the distance.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

In the specification of the present application, an example of obtaining a white light source by exciting a phosphor light emitting portion emitting yellow fluorescence with blue laser light has been shown. However, the emission color of the phosphor light emitting portion and the color of the laser light (wavelength) ) Is not limited to those illustrated. For example, when a phosphor light emitting section that emits light of any single color such as red, blue, or green is excited by, for example, a laser that emits ultraviolet light, a light source that emits light of a single color can be obtained. It goes without saying that the configuration of the present application can be applied to such a configuration in which the phosphor light emitting section emits light in a single color. The present invention can also be applied to the case where a phosphor light emitting portion that emits white light is excited by a laser that emits ultraviolet light.

1 Excitation light source (light source)
2 Light source device 3 Phosphor light emitting part 4 Mask (regular reflection member)
DESCRIPTION OF SYMBOLS 5 Wavelength conversion element 8 Excitation light 9 Excitation area 10 White light 11 Reflective member 12 Parabolic member 13 Excitation light incident area 15

Focus lens

16, 19 Aperture 17 Absorption member 18 Substrate θ1 Incident angle

Claims

A light source that emits excitation light;
A phosphor light emitting part formed with an excitation region that is excited by excitation light emitted from the light source and emits light of a color different from the excitation light;
A light source device comprising: a regular reflection member formed along a periphery of the excitation region and having a surface that regularly reflects the excitation light.
The light source device according to claim 1, wherein the regular reflection member regularly reflects 90% or more of the components of the excitation light reflected.
The light source device according to claim 1, wherein the excitation region diffusely reflects the excitation light so as to be mainly emitted from an incident surface of the excitation light.
The light source device according to claim 1, wherein the excitation region transmits a part of the excitation light.
The light source device according to claim 1, wherein the regular reflection member is disposed on the phosphor light emitting unit and has an opening exposing the excitation region.
The light source device according to claim 1, wherein the regular reflection member is disposed so as to surround the phosphor light emitting unit, and has an opening in which the phosphor light emitting unit is buried.
The light source device according to claim 1, wherein the phosphor light-emitting unit is arranged to be tilted around an inclination axis perpendicular to the optical axis with respect to an optical axis of the excitation light.
The light source device according to claim 1, further comprising an absorbing member that absorbs excitation light specularly reflected by the specular reflection member.
The light source device according to claim 1, further comprising a reflecting member that reflects the excitation light regularly reflected by the regular reflection member toward the excitation region.
The light source device according to claim 1, further comprising a parabolic member that reflects white light emitted from the phosphor light emitting unit.