WO2017199368A1

WO2017199368A1 - Light source and detection device

Info

Publication number: WO2017199368A1
Application number: PCT/JP2016/064734
Authority: WO
Inventors: ミイシャオユウ; 及川浩一; 鎌田徹; 田中公敏
Original assignee: 富士通株式会社
Priority date: 2016-05-18
Filing date: 2016-05-18
Publication date: 2017-11-23

Abstract

This light source is provided with: a reflector 12 wherein at least a part of an inner surface that reflects light 50 is a curved surface recessed toward the inner side; a light guide plate 14, which is provided along the inner surface of the reflector 12, said inner surface having the curved surface recessed toward the inner side, and which has, at least in a part of the inner surface and an outer surface, a recessed section and/or a protruding section that scatters the light 50, said light guide plate propagating the light 50; and an irradiation unit that irradiates the light guide plate 14 with the light.

Description

Light source and detection device

This case relates to a light source and a detection device.

It is known to use an integrating sphere to obtain uniform light (for example, Patent Document 1). It is also known to provide a prism sheet having a triangular prism surface on a flat light guide plate (for example, Patent Document 2).

JP 2003-4631 A JP 2003-202273 A

∙ Light can be made uniform by multiple reflections on the inner surface of the integrating sphere. However, the integrating sphere is provided with an aperture for introducing and / or emitting light. For this reason, the uniformity of the light inside the integrating sphere may not be ensured.

The purpose of this light source and detection device is to make the internal light uniform.

At least a part of the inner surface that reflects light is provided along a reflector having a concave curved surface on the inside, and an inner surface having a concave curved surface on the inner side of the reflector, and the light is provided on at least a part of the inner surface and the outer surface. A light source comprising: a light guide plate that has at least one of a concave portion and a convex portion that scatters light and that propagates the light; and an irradiation portion that irradiates the light to the light guide plate.

A detection apparatus comprising the light source for irradiating light to a sample and a detector for detecting the state of the sample is used.

According to the light source and the detection device, the internal light can be made uniform.

FIG. 1A is a cross-sectional view of a light source according to the first embodiment, and FIG. 1B is a front view showing the arrangement of light guide plates and LEDs. FIG. 2 is a cross-sectional view illustrating the reflector and the light guide plate in the first embodiment. FIG. 3 is a cross-sectional view illustrating a reflector 1 and a light guide plate of the first modification of the first embodiment. FIG. 4 is a cross-sectional view illustrating a light source according to the second embodiment. FIG. 5 is a cross-sectional view illustrating a light source according to the first modification of the second embodiment. FIG. 6 is a cross-sectional view illustrating a light source according to a second modification of the second embodiment. FIG. 7 is a cross-sectional view illustrating a light source according to a third modification of the second embodiment. FIG. 8 is a cross-sectional view illustrating a light source according to a fourth modification of the second embodiment. FIG. 9A and FIG. 9B are cross-sectional views illustrating the reflector and the light guide plate in the third embodiment. FIG. 10A and FIG. 10B are cross-sectional views illustrating the reflector and the light guide plate in the first modification of the third embodiment. FIG. 11A and FIG. 11B are cross-sectional views showing a reflector and a light guide plate in Modification 2 of Example 3. FIG. 12A and FIG. 12B are cross-sectional views showing the reflector and the light guide plate in Modifications 3 and 4 of the third embodiment. FIG. 13 is a block diagram of a detection apparatus according to the fourth embodiment. FIG. 14 is a front view showing the arrangement of light guide plates and LEDs in the fifth embodiment. FIG. 15A to FIG. 15C are diagrams showing the spectrum of each LED in Example 5, and FIG. 15D is a diagram showing the spectrum of light irradiated on the sample. 16 (a) to 16 (c) are other diagrams showing the spectrum of each LED in Example 5, and FIG. 16 (d) is a diagram showing the time dependence of the intensity of light irradiated on the sample.

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

FIG. 1A is a cross-sectional view of a light source according to the first embodiment, and FIG. 1B is a front view showing the arrangement of light guide plates and LEDs. FIG. 1B shows the positional relationship among the end face of the reflector 12a, the end face of the light guide plate 14, LEDs (Light Emitting Diode) 16a and 16b, the opening 18b, and the detector 24 as viewed from the front. + Indicates the apex 60 of the hemisphere. FIG. 1A corresponds to the AA cross section of FIG.

1 (a) and 1 (b), the light source 100 includes an integrating sphere 20 and

LEDs

16a and 16b. The integrating sphere 20 is hemispherical and includes a reflector 12 and a light guide plate 14. The reflector 12 includes a reflector 12a having a hemispherical inner surface and a reflector 12b having a planar inner surface. The light guide plate 14 is hemispherical and is provided along the inner surface of the reflector 12a. In the reflector 12a and the light guide plate 14,

openings

18a and 18b are formed at the apex 60 of the hemisphere, respectively. A plurality of LEDs 16a are provided on the end face of the light guide plate 14 in the opening 18b. A plurality of LEDs 16 b are provided on the outer end face of the light guide plate 14. The reflector 12b is provided with an opening 18c at the center. For example, a detector 24 is provided in the opening 18a, and for example, a sample 22 is disposed in the opening 18c.

FIG. 2 is a cross-sectional view showing the reflector and the light guide plate in the first embodiment. As shown in FIG. 2, concave portions 30 are provided on the inner surface 15 a and the outer surface 15 b of the light guide plate 14. The LED 16 emits light 50 a to the end face of the light guide plate 14. The light 50a enters the light guide plate 14 from the end face. The light 50 b propagating through the light guide plate 14 is scattered by the recess 30. A part of the light scattered by the concave portion 30a of the inner surface 15a of the light guide plate 14 is radiated as light 50c into the integrating sphere 20. The light 50 b reflected by the inner surface 15 a propagates in the light guide plate 14. A part of the light 50d scattered by the concave portion 30b of the outer surface 15b of the light guide plate 14 is reflected by the inner surface of the reflector 12a and enters the light guide plate 14 from the outer surface 15b of the light guide plate 14 or is reflected by the outer surface 15b. A part of the light 50 e irradiated from the inside of the integrating sphere 20 to the inner surface 15 a of the light guide plate 14 is reflected and a part of the light 50 e enters the light guide plate 14. In this way, the light 50b propagating through the light guide plate 14 is scattered by the recess 30 and becomes uniform.

Referring back to FIG. 1A, the light that has entered the light guide plate 14 from the

LEDs

16a and 16b becomes light 50 that propagates uniformly inside the integrating sphere 20 as shown in FIG. Thereby, the uniform light 52 is emitted from the opening 18c, and is irradiated to the sample 22, for example. The light 52 has a uniform intensity and / or spectrum of the light 52 regardless of the position of the irradiated surface. The detector 24 provided in the opening 18 a detects the state of the sample 22 by detecting light scattered or emitted from the sample 22.

The

reflectors

12a and 12b are insulators such as a metal whose inner surface is a mirror surface or a resin (for example, foamed polystyrene) having a reflective film applied to the inner surface. The light guide plate 14 is a material that is transparent to light 50 such as resin or glass. The width W, the depth D, and the pitch P of the concave portions 30 formed on the inner surface 15a and the outer surface 15b of the light guide plate 14 are, for example, several hundred nm to several hundred μm. The width W and the depth D are preferably about the wavelength of the light 50b or more. For example, the width W, the depth D, and the pitch P are uniform in the light guide plate 14. The width W, the depth D, and the pitch P are substantially the same in the region 64 near the opening 18b and the far region 62 (region near the LED 16a) of the light guide plate 14, for example. The sample 22 is an object irradiated with uniform light. When the light 50a is white light, the color rendering property is preferably 85 or more, and the color temperature is preferably from 3000K to 7000K.

FIG. 3 is a cross-sectional view showing a reflector and a light guide plate in Modification 1 of Embodiment 1. As shown in FIG. 3, a plurality of convex portions 32 are provided on the inner surface 15 a and the outer surface 15 b of the light guide plate 14. The width W, height H, and pitch P of the protrusions 32 are, for example, several hundred nm to several hundred μm. The width W and height H are preferably about the wavelength of the light 50b or longer.

As in Modification 1 of Example 1, convex portions 32 may be provided on the inner surface 15 a and the outer surface 15 b of the light guide plate 14 instead of the concave portions 30. Both the recessed part 30 and the convex part 32 may be provided.

FIG. 4 is a cross-sectional view showing a light source according to the second embodiment. As shown in FIG. 4, in the light source 101, the integrating sphere 20 is spherical. The reflector 12 has a spherical inner surface. The light guide plate 14 is spherical and is provided along the inner surface of the reflector 12.

Openings

18 a and 18 c are formed in the reflector 12.

Openings

18 b and 18 d are formed in the light guide plate 14. The

openings

18a and 18c are provided symmetrically with respect to the spherical center. The

openings

18a and 18b are formed to be continuous, and the

openings

18c and 18d are formed to be continuous. An LED 16a is disposed on the end face of the light guide plate 14 on the opening 18b side. An LED 16b is disposed on the end face on the opening 18d side of the light guide plate 14a. Other configurations are the same as those of the first embodiment, and the description thereof is omitted. As in the second embodiment, the reflector 12 and the light guide plate 14 may be spherical.

FIG. 5 is a cross-sectional view showing a light source according to Modification 1 of Embodiment 2. As shown in FIG. 5, the light guide plate 14 includes hemispherical

light guide plates

14a and 14b. The

openings

18b and 18d are provided at the apexes of the

light guide plates

14a and 14b, respectively. An LED 16a is disposed on the end face of the opening 18b of the light guide plate 14a. An LED 16b is disposed on the end surface of the light guide plate 14a opposite to the opening 18a. The light guide plate 14b is not provided with LEDs. Other configurations are the same as those of the second embodiment, and the description thereof is omitted.

FIG. 6 is a cross-sectional view illustrating a light source according to a second modification of the second embodiment. As shown in FIG. 6, in the light source 103, an LED 16c is provided on the end surface opposite to the opening 18d of the light guide plate 14b. Other configurations are the same as those of the first modification of the second embodiment, and a description thereof will be omitted.

FIG. 7 is a cross-sectional view showing a light source according to Modification 3 of Embodiment 2. As shown in FIG. 7, in the light source 104, the sample 22 is provided at the center of the integrating sphere 20.

Openings

18c and 18d for the sample 22 are not provided. The light guide plate 14 is spherical. The LED 16 is provided on the end surface of the light guide plate 14 on the opening 18b side. Other configurations are the same as those of the second embodiment, and the description thereof is omitted.

FIG. 8 is a cross-sectional view illustrating a light source according to Modification 4 of Embodiment 2. As shown in FIG. 8, the light source 105 is not provided with the light guide plate 14b. Other configurations are the same as those of the first modification of the second embodiment, and a description thereof will be omitted.

According to the first and second embodiments and the modifications thereof, at least a part of the inner surface 15a of the reflector 12 is a concave curved surface (for example, a curved surface having a positive Gaussian curvature). The reflector 12 reflects light. The light guide plate 14 is provided on the inner side of the reflector 12 along the concave curved inner surface 11a. The light guide plate 14 has a concave portion 30 or a convex portion 32 on the inner surface 15a and the outer surface 15b, and light propagates. The LED 16 irradiates the light guide plate 14 with light. As a result, as shown in FIG. 2, the light propagating through the light guide plate 14 is scattered by the concave portion 30 or the convex portion 32 formed on the inner surface 15 a and the outer surface 15 b and further reflected by the concave curved surface inside the reflector 12. . Thereby, even if the opening 18a is provided in the reflector 12, the light inside the integrating sphere 20 can be made uniform. Therefore, the intensity and / or spectrum of the light 52 irradiated from the opening 18b can be made uniform within the irradiation surface. The inwardly concave curved surface may be at least a part of a spherical surface as in the first and second embodiments and the modifications thereof, for example. In addition, the inwardly concave curved surface may be at least a part of an ellipsoidal surface or a part of a parabolic rotating body.

As in the first embodiment, the inner surface 11a of the reflector 12 may have at least a part of a spherical surface. Thereby, at least a part of the spherical surface can multiplex-reflect light into the integrating sphere 20. Moreover, the light-guide plate 14 should just be provided along the surface of at least one part of a spherical surface. Thereby, the scattered light is irradiated onto the inner surface 11 a having at least a part of the spherical surface of the reflector 12. Therefore, the light inside the integrating sphere can be made uniform. It is sufficient that at least one of the concave portion 30 and the convex portion 32 is provided on at least one of the inner surface 15a and the outer surface 15b of the light guide plate 14.

The LED 16 preferably irradiates the end face of the light guide plate 14 with light. Thereby, light can be introduced into the light guide plate 14. Although the LED 16 has been described as an example of the irradiation unit, the irradiation unit may be other than the LED.

As in Examples 1 and 2, it is preferable that the inner surface of the reflector 12 has at least a hemispherical surface, and the light guide plate 14 is at least hemispherical. Thereby, the reflector 12 can reflect more light in the integrating sphere 20, and the light guide plate 14 can scatter more light. Therefore, the light inside the integrating sphere 20 can be made uniform. The spherical shape may not be a geometric sphere. Further, the hemisphere and the sphere need not be a complete hemisphere and a sphere. For example, the portions for providing the openings 18a to 18d, the LED 16, the sample 22, the detector 24, and / or other components may be omitted from the hemispherical shape and the spherical shape. Further, the hemisphere includes a semi-ellipsoidal shape and a parabolic rotating body shape. The spherical shape includes an ellipsoidal shape.

As in Example 1, the inner surface of the reflector 12 has a hemispherical surface and a flat surface, and the light guide plate 14 is provided along the hemispherical surface. Thus, by using the hemispherical reflector 12, the inside of the integrating sphere 20 becomes symmetric and the light can be made uniform. The plane is preferably a plane passing through the center of the hemisphere.

The reflector 12 has an opening 18c as an exit through which light is emitted in a plane. Thereby, the light source can emit more uniform light. The light at the symmetrical position in the integrating sphere 20 is more uniform. In order to make the light uniform, the structure in the integrating sphere 20 is preferably symmetrical. For this reason, when the exit port is provided on a plane, the exit port preferably includes the center of the plane. When the exit port is provided on the hemispherical surface, the exit port preferably includes the apex of the hemispherical surface. Thereby, more uniform light can be emitted from the emission port.

It is preferable that the opening 18a (first opening) of the reflector 12 is provided at the apex of the hemispherical surface, and the light guide plate 14 has an opening 18b (second opening) connected to the opening 18a of the reflector 12. Thereby, the opening 18 a can be provided at a symmetrical position of the reflector 12 and the light guide plate 14. Therefore, the light can be made more uniform.

As in Example 2 and its modifications, the inner surface of the reflector 12 preferably has a spherical surface, and the light guide plate 14 is preferably provided along at least a hemispherical surface among the spherical surfaces. Since the inner surface of the reflector 12 is a spherical surface, the inside of the integrating sphere 20 is symmetric. Further, since the light guide plate 14 is provided at least along the hemispherical surface, the scattered light can be increased and the light can be made more uniform.

The light guide plate 14 has a hemispherical shape, and the light guide plate 14 has an opening 18b connected to the opening 18a of the reflector 12 at the apex of the hemispherical shape. Thereby, the

openings

18 a and 18 b can be provided at symmetrical positions of the reflector 12 and the light guide plate 14. Therefore, the light can be made more uniform.

FIG. 9A and FIG. 9B are cross-sectional views showing a reflector and a light guide plate in Example 3. FIGS. 9A and 9B are diagrams corresponding to the

regions

62 and 64, respectively, of FIG. As shown in FIG. 9A, the width, depth, and pitch of the recesses 30 in the region 62 are defined as a width W1, a depth D1, and a pitch P1, respectively. As shown in FIG. 9B, the width, depth, and pitch of the recess 30 in the region 64 are defined as width W2, depth D2, and pitch P2, respectively. As shown in FIGS. 9A and 9B, in the

regions

62 and 64, the widths W1 and W2 are substantially the same, and the pitches P1 and P2 are substantially the same. The depth D2 of the region 64 is greater than the depth D1 of the region 62. Other configurations are the same as those of the first embodiment, and the description thereof is omitted. When the convex portion 32 is provided on the light guide plate 14 as in the first modification of the first embodiment, the height of the region 64 is made larger than the height of the region 62.

FIG. 10A and FIG. 10B are cross-sectional views showing a reflector and a light guide plate in Modification 1 of Example 3. FIG. FIG. 10A and FIG. 10B are diagrams corresponding to the

regions

62 and 64, respectively, of FIG. As shown in FIGS. 10A and 10B, in the

regions

62 and 64, the depths D1 and D2 are substantially the same, and the pitches P1 and P2 are substantially the same. The width W2 of the region 64 is larger than the width W1 of the region 62. Other configurations are the same as those of the third embodiment, and the description thereof is omitted.

FIG. 11A and FIG. 11B are cross-sectional views showing a reflector and a light guide plate in Modification 2 of Example 3. FIG. 11A and FIG. 11B are diagrams corresponding to the

regions

62 and 64, respectively, of FIG. As shown in FIGS. 11A and 11B, in the

regions

62 and 64, the widths W1 and W2 are substantially the same, and the depths D1 and D2 are substantially the same. The pitch P2 of the region 64 is smaller than the pitch P1 of the region 62. Other configurations are the same as those of the third embodiment, and the description thereof is omitted.

In Example 1 and its modification, reflection and / or scattering of the light 50 by the reflector 12a and the light guide plate 14 do not occur in the opening 18a. For this reason, the light density decreases in the vicinity of the opening 18a.

As in Example 3 and its modification, the scattering efficiency of the recess 30 in the vicinity region 64 of the opening 18a is higher than the scattering efficiency of the recess 30 in the region 62 far from the vicinity region 64 of the opening 18a. Thereby, scattering of the light 50 by the light guide plate 14 increases in the vicinity region 64 of the opening 18a. Therefore, the light density can be made uniform.

In order to make the scattering efficiency different, the depth D2 of the recess 30 in the region 64 may be made larger than the depth D1 of the recess 30 in the region 62 as in the third embodiment. Further, when the light guide plate 14 is provided with the convex portion 32, the height of the convex portion in the region 64 may be made larger than the height of the convex portion 32 in the region 62.

Further, as another method of making the scattering efficiency different, the concave portion in the region 64 may be made larger than the concave portion in the region 62 as in the first modification of the third embodiment. The same applies to the case where the light guide plate 14 is provided with the convex portion 32. Furthermore, as in the second modification of the third embodiment, the density of the recesses 30 in the region 64 can be made higher than the density of the recesses 30 in the region 62. The same applies to the case where the light guide plate 14 is provided with the convex portion 32.

In the third embodiment and the modification thereof, an example has been described in which at least one of the width, depth or height, and density of at least one of the concave portion 30 and the convex portion 32 is different between the

regions

62 and 64. At least one of the width, the depth or the height, and the density may gradually change from the opening 18a side to the opposite side of the light guide plate 14.

Also in Example 2 and its modification, at least one of the width, depth or height, and density of at least one of the concave portion 30 and the convex portion 32 can be made different between the

regions

62 and 64.

12 (a) and 12 (b) are cross-sectional views showing a reflector and a light guide plate in Modifications 3 and 4 of Example 3. FIG. As shown in FIG. 12A, the particles 34 are dispersed in the light guide plate 14. The particle size of the particle 34 is, for example, several hundred nm to several hundred μm. The material of the particle 34 is a material that reflects and / or reflects the light 50, and for example, a metal particle, an insulator material, or a semiconductor material can be used. As shown in FIG. 12B, the bubbles 36 are dispersed in the light guide plate 14. The particle diameter of the bubbles 36 is, for example, several hundred nm to several hundred μm.

According to Modifications 3 and 4 of Example 3, the light guide plate 14 includes at least one of particles 34 and bubbles 36 that reflect or scatter light. Thereby, the light scattering efficiency in the light guide plate 14 can be increased.

Example 4 is an example of a detection apparatus using Examples 1 to 3 and a modification thereof. FIG. 13 is a block diagram of a detection apparatus according to the fourth embodiment. As illustrated in FIG. 13, the detection device 106 includes a light source 100, a light collecting unit 42, a sensor 44, an LED control unit 46, and a control unit 40. The light source 100 is a light source according to the first embodiment. The condenser 42 collects the light in the integrating sphere 20. The sensor 44 separates the light collected by the light collecting unit 42 or measures the illuminance. If the light in the integrating sphere 20 is uniform, the intensity and / or spectrum of the light collected by the light collecting unit 42 is substantially the same as the light 52 emitted from the light source 100 to the sample 22. The LED control unit 46 controls the light emission intensity and / or the light emission time of the

LEDs

16a and 16b. The control unit 40 is, for example, a computer or a processor, and controls the detector 24, the sensor 44, and the LED control unit 46.

For example, the control unit 40 controls the LED control unit 46 based on the illuminance in the integrating sphere 20 detected by the sensor 44 to control the illuminance in the integrating sphere 20 to a desired illuminance. The control unit 40 controls the LED control unit 46 based on the spectral information of the light in the integrating sphere 20 detected by the sensor 44, and controls the color rendering properties and / or the color temperature in the integrating sphere 20 to desired values. The control unit 40 causes the detector 24 to detect the state of the sample 22 when the illuminance, color rendering properties, and / or color temperature in the integrating sphere 20 reach desired values. For example, the detector 24 takes a picture of the sample 22 using the light 54 emitted by the sample 22 or splits the light 54 emitted by the sample 22.

According to Example 4, the light source 100 irradiates the sample 52 with the light 52. The detector 24 detects the state of the sample 22. Since the light 52 emitted from the light source 100 is uniform, the sample 22 emits uniform light 54. Therefore, the state of the sample 22 can be detected with high accuracy. For example, when the detector 24 captures a photograph of the sample 22, the surface of the sample 22 is irradiated with uniform light, so that a highly accurate photograph can be captured. Embodiments 2 to 4 and modifications thereof may be used in the detection device.

FIG. 14 is a front view showing the arrangement of light guide plates and LEDs in Example 5. As shown in FIG. 14, different types of

LEDs

16x, 16y, and 16z are provided as the

LEDs

16a and 16b. The

LEDs

16x, 16y, and 16z are arranged equally, for example. Other configurations are the same as those of the fourth embodiment, and the description thereof is omitted.

15 (a) to 15 (c) are diagrams showing the spectrum of each LED in Example 5, and FIG. 15 (d) is a diagram showing the spectrum of light irradiated on the sample. FIG. 15A to FIG. 15C are emission spectra of the LEDs 16x to 16z, respectively. As shown in FIGS. 15A to 15C, the emission spectra of the LEDs 16x to 16z are different. In the fourth embodiment, the control unit 40 controls the LED control unit 46 based on the result of the sensor 44. The LED control unit 46 adjusts the intensity of the

LEDs

16x, 16y, and 16z. Thereby, the spectrum of the light 52 irradiated to the sample 22 can be adjusted to a desired spectrum as shown in FIG.

16 (a) to 16 (c) are other diagrams showing the spectrum of each LED in Example 5, and FIG. 16 (d) is a diagram showing the time dependence of the intensity of light irradiated on the sample. FIG. 16A to FIG. 16C are emission spectra of the LEDs 16x to 16z, respectively. As shown in FIGS. 16A to 16C, the LEDs 16x to 16z emit light having

spectra

70x, 70y, and 70z, respectively. The spectra 70x to 70z are different from each other. In the fourth embodiment, the control unit 40 varies the periods during which the LED control unit 46 emits the

LEDs

16x, 16y, and 16z. Thereby, as shown in FIG. 16D, the spectrum of the light 52 irradiated to the sample 22 becomes the spectrum 70x in the period Tx, becomes the spectrum 70y in the period Ty, and becomes the spectrum 70z in the period Tz. Thus, the sample 22 can be irradiated with light 52 having a different spectrum depending on the period.

In Examples 1 to 5 and the modifications thereof, the

lights

50 and 54 are, for example, visible light, ultraviolet light, or infrared light in a narrow sense. In a broader sense, the electromagnetic wave includes X-rays and the like.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. It can be changed.

11 Reflector

inner surface

12, 12a,

12b Reflector

14, 14a, 14b Light guide plate 15a Wave guide plate inner surface 15b Light guide plate

outer surface

16, 16a, 16b, 16x, 16y, 16z LED
18a, 18b, 18c Aperture 20 Integrating sphere 22 Sample 30 Concave part 32 Convex part 34 Particles 36 Bubble 24

Detector

50, 50a-50e, 52, 54 Light

Claims

A reflector that is a concavely curved surface inside at least a part of the inner surface that reflects light;
A light guide plate that is provided along an inner surface having a concave curved surface on the inner side of the reflector, has at least one of a concave portion and a convex portion for scattering the light on at least a part of the inner surface and the outer surface, and propagates the light. When,
An irradiation unit for irradiating the light to the light guide plate;
A light source comprising:
The inner surface of the reflector has at least a hemispherical surface;
The light source according to claim 1, wherein the light guide plate is at least hemispherical.
The light source according to claim 1 or 2, wherein the irradiation unit irradiates the light onto an end surface of the light guide plate.
The inner surface of the reflector has a hemispherical surface and a flat surface,
The light source according to claim 1, wherein the light guide plate is provided along the hemispherical surface.
An inner surface of the reflector has a spherical surface;
The light source according to any one of claims 1 to 3, wherein the light guide plate is provided along at least a hemispherical surface of the spherical surfaces.
6. The light source according to claim 1, wherein the reflector has a first opening, and the light guide plate has a second opening continuous with the first opening.
The light scattering efficiency of at least one of the concave portion and the convex portion in the vicinity region of the second opening is higher than the scattering efficiency of at least one of the concave portion and the convex portion in a region farther from the vicinity region to the second opening. The light source according to claim 6.
The light source according to any one of claims 1 to 7, wherein the light guide plate includes at least one of particles and bubbles that reflect or scatter the light.
The light source according to any one of claims 1 to 8, wherein the irradiation unit includes a plurality of irradiation units having different emission spectra.
The light source according to claim 4, wherein the reflector has an emission port for emitting the light on the plane.
The reflector has a first opening at the apex of the hemispherical surface;
The light source according to claim 4, wherein the light guide plate has a second opening that is continuous with the first opening.
The reflector has a first opening;
The light guide plate is hemispherical,
6. The light source according to claim 5, wherein the light guide plate has a second opening continuous with the first opening at the hemispherical apex.
13. The light source according to claim 12, wherein the reflector has an exit opening that emits the light on the opposite side of the first opening.
The light source according to any one of claims 1 to 13, wherein the sample is irradiated with light;
A detector for detecting the state of the sample;
A detection apparatus comprising: