WO2005106410A1

WO2005106410A1 - Point light source and optical device comprising same

Info

Publication number: WO2005106410A1
Application number: PCT/JP2005/008153
Authority: WO
Inventors: Harumi Uenoyama; Naokichi Katade; Yasuo Sakaue
Original assignee: Arkray, Inc.
Priority date: 2004-04-30
Filing date: 2005-04-28
Publication date: 2005-11-10

Abstract

[PROBLEMS] To provide a small multicolor light source. [MEANS FOR SOLVING PROBLEMS] A housing (2) has an inner cavity (4) which has a concave inner wall surface with a high reflectance. The housing (2) is provided with one or more light outlets (6) communicating from the inner cavity (4) to the outside. The light outlet (6) has a hole small enough to be regarded as a point light source. A plurality of light-emitting bodies (8) are arranged in the cavity (4) while being directed not to face the light outlet (6) directly. The light-emitting bodies (8) are arranged uniformly in a circle along the inner wall surface in the plane perpendicular to an axis passing through the hole of the light outlet (6).

Description

Specification

Point light source and optical device having the same

Technical field

The present invention relates to a point light source used for various optical devices, and an optical device such as an optical measuring device and a lighting device using the same.

Background art

FIG. 8 shows an example of a light source used in an optical measurement device. As the light source, a light emitting element such as an LED (light emitting diode) or an LD (laser diode) is used in addition to a light source using a filament as a light emitting body.

[0003] (A) shows a light source using a filament as a luminous body. In order to increase the amount of light, a reflecting mirror 52 is disposed behind the filament 50, and the light emitted from the filament 50 forwards. The light collected by the reflector 52 is extracted forward.

[0004] (B) is provided with a light emitting element 54 such as an LED or an LD and a reflecting mirror 56. In this case also, in order to increase the amount of light, the light emitted forward from the light emitting element 54 and the reflecting mirror 56 are used. The light collected at 56 is extracted forward.

[0005] (C) shows an example of a multicolor light source. Three types of LDs and LEDs having different emission wavelengths are arranged as the light emitting elements 58a to 58c, and the light from the light emitting elements 58a to 58c is arranged on the same optical axis in order to arrange the light from the light emitting elements 58a to 58c on the same optical axis. Half mirrors 60a and 60b are provided. The light-emitting element 58b is arranged so that the light emitted from the light-emitting element 58a is reflected by the half mirror 60a and is located on the optical axis of the light, and the light-emitting element 58c is reflected on the half-mirror 60b to be on the same optical axis. It is arranged so that it may come.

[0006] As a measuring device for performing measurement at a plurality of wavelengths, there is a device in which a plurality of LDs having different oscillation wavelengths are respectively arranged toward a sample (see Patent Document 1). However, since the optical axis of each LD force is coincident, the different locations of the sample are measured at the same time.

[0007] Therefore, in order to perform multicolor measurement at the same place on the sample, the target object is illuminated by moving a reflecting mirror that places light from a plurality of light sources having different oscillation wavelengths on one optical axis. There is proposed a device in which the wavelength of light is selected (see Patent Document 2;). FIG. 9 shows an example of another conventional measuring device for performing measurement at a plurality of wavelengths.

(A) is an example of an absorptiometer, in which light from a light source 62 that generates light of multiple wavelengths is split by a diffraction grating 64 and is incident on the sample 20 as incident light of a predetermined wavelength. The light transmitted through the sample 20 is detected by the photodetector 22, and its output is taken into the measuring electrical system 24a to determine the absorbance. The incident wavelength is switched by the rotation of the diffraction grating 64.

(B) uses a filter rotor 66 provided with a plurality of filters having different transmission wavelengths as spectral means. Light from a light source 62 that generates light of multiple wavelengths is converted into light of a predetermined wavelength by a selected filter in a filter rotor 66 and enters the sample 20.

[0010] (C) uses the multicolor light source shown in Fig. 8 (C). When the light emitting elements 58a to 58c are switched and turned on, the wavelength of light transmitted through the sample is switched.

(D) similarly uses a multicolor light source. In this case, light from the light emitting elements 58a to 58e having different emission wavelengths are respectively incident on the optical fibers 70a to 70e by the lenses 68a to 68e and guided to the sample 20. The optical fibers 70a to 70e are combined into one at the light emission side, and enter the same position on the sample 20. In this case as well, the absorbance in multiple colors is measured by switching the lighting of the light emitting elements 58a to 58e.

FIG. 10 shows a conventional spectral colorimeter. The light from the light source 62 enters the integrating sphere 74 together with the light reflected by the reflecting mirror 72. The integrating sphere 74 is provided with a sample 76 and a light outlet 78, and the reflected light from the sample 76 enters the diffraction grating 80 from the light outlet 78, is separated, and is incident on the photodiode array 82. The photodiode array 82 detects multiple wavelengths simultaneously, and the measurement electrical system 84 measures the spectral reflectance.

FIG. 11 shows a multicolor lighting device. As the light source, a multicolor light source shown in FIG. 8 (C) is used, and the light from the object 42 is imaged by the CCD camera 44 when the light emitting elements 58a to 58c are sequentially turned on, and the inspection of the object 42 is performed. And identification is performed.

FIG. 12 shows a traffic light. One light source 90 is provided for each of the red, yellow, and blue signal display sections 43R, 43Y, and 43B, and the traffic of people and vehicles is controlled by turning on each light source 90 sequentially.

Patent Document 1: JP-A-9-105717 Patent Document 2: JP-A-9-173323

Disclosure of the invention

Problems to be solved by the invention

[0014] As a light source of the optical measuring device, a point light source is preferable. In the case of a point light source, if the light from the light source is focused on an object using an optical element such as a lens, a minute area on the object can be illuminated with a large amount of light, and high-sensitivity measurement can be performed. Can do it.

[0015] A light source that collects light with a reflector as shown in Figs. 8 (A) and 8 (B) is not a power point light source that is convenient for increasing the amount of light. If a pinhole filter is provided on the light emission side for a point light source, the light intensity will decrease.

[0016] A first object of the present invention is to provide a point light source capable of obtaining a large amount of light. In order to obtain a polychromatic light source, a spectral unit is required, or a half mirror is required. An optical system such as an optical fiber is required, and the light source becomes large.

[0017] A second object of the present invention is to provide a compact multicolor light source.

A third object of the present invention is to provide an optical device which is compact and can perform measurement and illumination with a large amount of light.

[0018] In an optical device capable of measuring and illuminating at a plurality of wavelengths, as shown in FIG. The ability to monochromatic the light from the generated light source with a spectral element such as a diffraction grating or a filter, or to collect the light from the light-emitting elements that generate light of different wavelengths on a single optical axis using a mirror or optical fiber Alternatively, it is necessary to provide a moving mirror as in the invention described in Patent Document 2. However, such an optical arrangement requires a large space, and the optical device becomes large. A fourth object of the present invention is to provide an optical device capable of performing measurement and illumination at a plurality of wavelengths and suitable for miniaturization.

Means for solving the problem

[0019] A point light source according to the present invention for achieving the first object has a housing having a hollow interior, and an inner wall surface of the hollow having a concave curved surface having a high reflectivity; It is formed as one or more holes communicating from the cavity to the outside, and the size of the holes is small enough to be regarded as a point. A light outlet, and one or more luminous bodies arranged in a direction not directly facing the light outlet in the internal cavity of the housing.

[0020] The expression "light exit small enough to be regarded as a point" means that the point light source of the present invention has a light exit point as a light emitting point, and thus has a size that can be regarded as a point light source. It describes the size of a light exit. Therefore, the size can be changed according to the size of the point light source and the light output intensity required by the use such as a measuring device and a lighting device. As an example, the size of the hole at the light outlet is 0.01 to 2 mm, preferably 0.1 to 1 mm in diameter. It can also be determined according to the size of the internal cavity. For example, the size of the hole at the light exit is 1Z8 or less, preferably 6% or less, of the maximum diameter of the internal cavity. However, the size of the light exit hole is not limited to a uniform one and can be increased beyond the above range as the size allowed by the application increases.

[0021] As the luminous body, a filament, an LED or an LD is suitable. In order to output a mixed light of a predetermined wavelength, it is preferable to arrange a plurality of types of light-emitting bodies having different emission wavelengths using LEDs or LDs!

The point light source according to the present invention for achieving the second object has a light emitting wavelength of an LED or LD as an illuminant so that light of a specific wavelength can be selectively output. A plurality of different types are arranged.

The luminous body is provided integrally with an optical filter corresponding to each emission wavelength.

Alternatively, the luminescence of each luminous energy may be emitted through the respective filters. The light scatterer may be arranged on the inner surface of the housing, in the cavity, or both. As the light scatterer, for example, a sphere or powder of glass or metal can be used.

Depending on the application, an optical element or a light scatterer may be provided outside the housing to adjust the trajectory of the emitted light beam with the vicinity of the light exit as a focal point or an object point.

[0024] One aspect of the optical device of the present invention for achieving the third object is a light source, and light transmitted by the measurement target when the light of the light source power is irradiated on the measurement target. , Reflected and scattered light, and light that detects at least one of fluorescence from the measurement object An optical measuring device comprising a detector and a point light source according to the present invention as a light source.

Another aspect of the optical device of the present invention for achieving the third object is a lighting device for illuminating an object with light having a light source, which is provided with the point light source of the present invention as a light source. is there.

An optical device according to the present invention for achieving the fourth object is the above-mentioned optical measuring device or lighting device, wherein the light source is provided with a plurality of types of light emitters having different emission wavelengths. In a power supply device for emitting light from a light emitter, a light source is a multicolor light source by selectively causing light emitters having different emission wavelengths to emit light at different times.

The invention's effect

[0026] In the point light source of the present invention, the light generated by the luminous power is reflected on the inner wall surface of the cavity, and then the light output is also emitted.

Also, since the inner wall surface has a high reflectance, light attenuation is suppressed, and light from the light emitting element can be effectively extracted.

[0027] Furthermore, since the luminous body is arranged in a direction that does not directly oppose the light exit, the light directly traveling from the luminous body toward the light exit is reflected at least once by the inner wall surface of the concave curved surface. Since the light is diverged or diffused, emitted light having a spatial distribution diverging from one point can be obtained from the light outlet. Also, in the case of an LD with a luminous body having coherence, it is also suitable as a measurement light source in which the coherence is reduced or eliminated by being reflected and diverged or diffused on the inner wall surface of the concave curved surface, and the coherence becomes an obstacle. It becomes.

[0028] In the case where a plurality of types of light emitters having different emission wavelengths are arranged, light having different wavelengths is emitted at different times without differentiating the light if the light is emitted at different times for each wavelength. Will be able to be taken out. In addition, if the light emitters emit light at the same time, light containing light of multiple wavelengths can be extracted. For example, light emission that emits light of three primary colors, R (red), G (green), and B (blue), can be obtained. By providing a body, you can extract white light

[0029] An optical filter corresponding to each emission wavelength is provided integrally with the luminous body, and light emission from each luminous body is emitted through the respective filter. Therefore, even when the light emission wavelength changes due to a temperature change using a light emitting element such as an LED or an LD, it is possible to keep the wavelength of the extracted light constant, including the light exit force.

When a plurality of light emitters having the same emission wavelength are arranged, the amount of light emitted from the point light source can be increased.

[0030] When the internal cavity is filled with a light scatterer, the divergence or diffusion of light in the internal cavity is promoted, the spatial distribution of light emitted from the light exit is further improved, and coherence is improved. It is more effective in eliminating.

[0031] If an optical element for adjusting the trajectory of the emitted light beam with the vicinity of the light exit as a focal point or an object point is arranged outside the housing, the light having this point light source power is extracted as parallel light, or this light is emitted onto the measurement object. An image of a point light source can be formed, and light can be scattered in a desired direction.

[0032] In the optical device of the present invention, if the measuring device is provided with the point light source of the present invention as a light source, measurement can be performed with a large amount of light with a small measuring device, and the S / N (signal-to-noise) ratio can be improved. Measurement can be performed, and if the point light source of the present invention is provided as a light source of the illumination device, bright illumination can be performed with a small illumination device.

In the optical device of the present invention, if a multi-wavelength light source is provided as a light source of the measuring device, multi-wavelength measurement can be performed with a small measuring device. Multi-wavelength illumination can be performed with a small illumination device.

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 schematically shows a point light source according to one embodiment. (A) is a side sectional view, and (B) is a front sectional view.

The housing 2 has a hollow inside, and the inner wall surface of the hollow 4 is a concave curved surface having high reflectance. The shape of the cavity 4 is not particularly limited, but may be a concave curved surface such as a sphere or an oval sphere to which light can be reflected and diverged. In this embodiment, an almost spherical one is exemplified.

The housing 2 is formed with one or a plurality of light outlets 6 communicating from the internal cavity 4 to the outside. Although the number of light outlets 6 is one in the embodiment, a plurality of light outlets 6 may be provided according to the purpose. The size of the hole of the light outlet 6 is small enough to be regarded as a point light source, and is preferably set to a size in the range of 0.01 to 2 mm in diameter. [0036] In the cavity 4, a plurality of luminous bodies 8 arranged in a direction not directly facing the light outlet 6 are arranged. The luminous body 8 may be a filament other than the LED and the LD. When a plurality of types having different emission wavelengths are used, an LED or an LD can be used as the illuminant. The luminous bodies 8 are evenly arranged on the circumference along the inner wall surface in a plane perpendicular to the axis passing through the hole of the light outlet 6.

[0037] FIG. 2 shows the housing 2 in further detail. (A) is a portion 2a provided with the light outlet 6, and (B) is a portion 2b opposed thereto. The housing 2 includes two housing portions 2a and 2b forming a cavity 4, and both the housing portions 2a and 2b are each formed with a hemispherical concave portion. A light outlet 6 is opened at the center of the bottom of the concave portion of the housing part 2a, and a groove 10 for arranging the light emitter along a circumference parallel to the edge of the opening is formed near the opening. Puru. The surface of the concave portion of the housing portion 2a is treated so as to have a high reflectance!

[0038] By joining the two housing portions 2a and 2b to face each other so that the concave portion is on the inside, a housing having a spherical cavity 4 therein is formed. The cavity 4 formed inside the housing by joining the two housing portions 2a and 2b is, for example, a sphere having a diameter of 16 mm.

Both housing portions 2a and 2b can be manufactured by cutting a metal block, or by forming a metal mold product and applying a metal film plating to increase the reflectivity on the concave wall surface. Monkey

[0039] A groove 10 for arranging the luminous body in the internal cavity is formed in the housing portion 2a in the vicinity of the opening of the recess by a plane V perpendicular to an axis 6a passing from the light outlet 6 to the center of the opening of the recess. It is formed along the circumference where the inner wall faces intersect. Light emitting bodies such as LEDs and LDs are evenly arranged along the groove 10 so as to face in a direction opposite to the light outlet 6. When the housing is formed by, for example, metal working, the groove 10 can be formed by, for example, counterboring with a depth of about lmm. Screw holes 12 and through holes 14 for joining and fixing are formed in the housing portions 2a and 2b, respectively.

When a plurality of types of light emitters are arranged, for example, LEDs or LDs of three primary colors of red (R), green (G), and blue (B) can be arranged evenly.

Next, the operation of this embodiment will be described. For example, it is assumed that a plurality of three types of light emitters R, G, and B are respectively arranged. Light emission operation of luminous body 8 for each type At different timings. The light from the luminous body 8 is reflected on the inner wall surface of the cavity 4 and diverges or diffuses, and preferably exits from the light outlet 6 after being reflected in multiples. Light exit 6 force The emitted light is divergent light. By emitting the light emitters of each emission wavelength at different timings, a multicolor light source in which different wavelength light is emitted from the light outlet 6 at different timings is obtained.

Since the light from the light outlet 6 becomes divergent light, an optical element such as a ball lens for making parallel light can be arranged near the light outlet 6. If the focal point of the optical element is arranged near the light exit 6, the outgoing light beam extracted through the optical element can be converted into a parallel light beam.

If the object point of the optical element arranged near the light exit 6 is arranged so as to be near the light exit 6, the image of the light exit 6 can be formed on the object.

If a scatterer is arranged outside near the light exit 6, divergent light can be seen from a direction away from the optical axis force.

Next, some examples of optical measuring devices using this point light source will be described.

FIG. 3 shows an example in which this point light source is used in an absorptiometer. Light from the light source 1 is incident on the measurement cell 20 as parallel light via an appropriate optical element such as a ball lens. Light transmitted through the sample in the measurement cell 20 is detected by the photodetector 22 and detected as an absorbance by the electric measurement system 24a.

The light source 1 is provided with a plurality of LEDs or LDs having different light emission wavelengths. The light sources having different light emission wavelengths are driven at different timings, whereby the wavelength of light incident on the measurement cell 20 is switched. The absorbance at each wavelength is measured. This enables measurement at multiple wavelengths without using a spectroscope, and enables measurement of multiple items.

FIG. 4 shows a reflection photometer or a colorimeter as an example of another measuring device. The light source 1 is placed in the entrance hole of the integrating sphere 26, and the sample 28 is placed at a position facing the entrance hole. A light detector 30 is arranged on a part of the integrating sphere 26 to receive the reflected light from the sample 28. The detection signal of the photodetector 30 is taken into the measurement electrical system 24b, and the reflectance is obtained. In this case as well, the light source 1 can switch and generate light of multiple wavelengths. Light from light source 1 is reflected by sample 28, and after multiple reflections in integrating sphere 26, multiple The reflectance at the wavelength is measured.

A colorimeter objectively measures tristimulus values felt by human eyes, and there are a tristimulus value type and a spectral type, but this example corresponds to a spectral type. The spectral type measures the spectral reflectance of a sample and obtains tristimulus values by numerically applying the spectral characteristics of the light source and the observer given as data to the measured spectral reflectance. Also in this example, even if a spectroscope is not used, the light source 1 generates multi-wavelength light at different timings, so that a spectral colorimeter can be realized.

FIG. 5A shows an example of application to a fluorometer and a Raman scattered light meter. Light from the light source 1 which is arranged at the light entrance of the integrating sphere 26 and can generate multi-wavelength light at different timings is incident on a sample 28 placed in the opening of the integrating sphere 26. Optical power reflected in the integrating sphere 26 and incident on the photodetector system 34 Fluorescent or Raman scattered light is detected. The detection output of the photodetector system 34 is taken into the measurement electrical system 24c, and the intensity of the fluorescent or Raman scattered light is measured.

An example of the photodetector system 34 is shown in FIG. The incident light contains excitation light including fluorescence and Raman scattering light. On the incident side of the photodetector 40, a Noria filter 36 and a bandpass filter 38 are arranged. The Noria filter 36 blocks excitation light and transmits light having a wavelength of fluorescence or Raman scattering light. The band-pass filter 38 has a transmission band for transmitting light having a wavelength of fluorescence or Raman scattered light set according to the substance to be measured. The light from which the excitation light has been removed enters the light detector 40.

In this measuring device, by switching the emission wavelength of the light source 1, light of multiple wavelengths enters the sample 28 at different timings, and fluorescence or Raman scattered light generated from the sample 28 is detected. Also in this case, the light source 1 can generate light of multiple wavelengths at different timings without using a spectroscope, so that measurement of multiple items can be performed.

FIG. 6 shows a multicolor illumination device as another example of the applied optical device.

The object 42 is irradiated with light from the light source 1, and the light from the object 42 is detected by the CCD camera 44. By switching the emission wavelength of the light source 1, multicolor inspection and multicolor identification of the object 42 can be performed. By arranging an optical element such as a ball lens on the light output side of the light source 1, it is possible to change the directivity such that the light irradiated to the object is divergent light or parallel light. FIG. 7 shows a traffic light as another example of the applied optical device. It comprises one signal display section 43 and one light source 1. A light source 1 that can sequentially generate red, yellow, and blue light is used. Light from the light source 1 diverges and irradiates the signal display unit 43, where it is scattered. The light source 1 may have one or more light outlets. In the signal display unit 43, it is preferable to dispose a light scatterer in the signal display unit 43 so that a lateral force that is not only at the front of the signal display unit 43 on the optical axis of the light source 1 can be easily seen.

[0051] In the optical measuring device or the illuminating device, a device that generates a mixed light of a plurality of wavelengths or a device that generates a light of a single wavelength may be used as the light source 1. In that case, even a small optical device can emit strong light.

Here, the results of measuring the directional characteristics of the light source of the embodiment shown in FIG. 1 are shown.

The housing parts 2a and 2b of the housing 2 are manufactured by cutting a metal block, and the internal cavity 4 when the housing parts 2a and 2b are combined to form the housing 2 has a spherical reflector 16 mm in diameter. It has become. The light exit 6 is a cylindrical hole having a diameter of 0.7 mm and a depth of 4 mm. As the luminous body 8, three LEDs of three primary colors of red (R), green (G), and blue (B) were equally arranged by three.

For measurement, as shown in FIG. 13, a CCD camera 100 was used as a measuring element, and a light receiving surface was arranged at a position 70 mm in front of the light outlet 6 of the light source with the light receiving surface facing the light outlet 6. 104 is a lead wire of the CCD camera 100.

The light output distribution in the X direction was measured on the light receiving surface of the CCD camera 100. The LED was illuminated by applying a current of 20 mA per LED and emitted for each color. The results are shown in FIGS. 14A to 14C for each of the three colors. The center of the light exit 6 is the optical axis of the output light, and the point 102 where the optical axis intersects the light receiving surface of the CCD camera 10 is defined as the origin in the X direction, and the distance from the origin is viewed from the light exit 6 through the CCD camera 100. Angle (radiation angle)

[0055] According to this result, for each color, a directional characteristic in which light with a relative light output of 50% converges within a range of ± 20 ° is shown, indicating that the color light can be used as a point light source. Call

This result shows the light intensity distribution in the X direction.The light source has a symmetrical distribution around the optical axis and the structural force of the light source. The direction also has the same relative light output distribution as shown in FIG.

The directional characteristics of the light output shown in FIG. 14 vary depending on the shape and size of the internal cavity 4 and the size and depth of the diameter of the light outlet 6.

Industrial applicability

[0056] The light source of the present invention can be used as a light source for various optical measuring devices and lighting devices for medical use, chemical analysis, environmental measurement, and the like.

Brief Description of Drawings

FIG. 1 schematically shows a point light source according to one embodiment, where (A) is a side sectional view and (B) is a front sectional view.

FIG. 2 is a diagram showing the housing in detail, where (A) is a portion provided with a light outlet, and (B) is a portion facing the light outlet. It is sectional drawing.

FIG. 3 is a schematic configuration diagram showing an absorptiometer as one example of an optical device.

FIG. 4 is a schematic configuration diagram showing a reflection photometer or a colorimeter as another embodiment of the optical device.

FIG. 5A is a schematic configuration diagram showing a fluorimeter or a Raman scattered light meter as still another embodiment of the optical device, and FIG. 5B is an example of a photodetector system in the embodiment. FIG.

FIG. 6 is a schematic configuration diagram showing a multicolor illumination device as still another embodiment of the optical device.

FIG. 7 is a diagram showing a traffic signal as still another embodiment of the optical device, where (A) is a plan view and (B) is a schematic sectional view.

8 (A) to 8 (C) are each a schematic configuration diagram showing a conventional light source.

[FIG. 9] (A) to (D) are each a schematic configuration diagram showing a conventional optical measuring device.

FIG. 10 is a schematic configuration diagram showing a conventional colorimeter.

FIG. 11 is a schematic configuration diagram showing a conventional multicolor illumination device.

FIG. 12 is a diagram showing a conventional traffic signal, where (A) is a plan view and (B) is a schematic cross-sectional view of one signal light.

FIG. 13 is a plan view showing a measuring device for measuring the directional characteristics of the light source according to the embodiment. FIG. 14 is a diagram showing the results of the directional characteristics of the light source according to one embodiment. Explanation of reference numerals

1 Light source

2 housing

4 cavities

6 Light exit

8 luminous body

10 Groove for placing luminous body

20 measuring cell

22 Light detector

24a, 24b, 24c Electric measurement system

26 integrating sphere

28 samples

30 light detector

34 Photodetector system

43 Signal display

44 CCD camera

Claims

The scope of the claims

[1] A housing having a hollow inside, and an inner wall surface of the hollow having a concave curved surface having high reflectivity, and one or more holes communicating with the internal cavity force and the outside in the housing. A light exit so small that the size of the hole can be regarded as a point;

Arranged in a direction not directly facing the light outlet in the internal cavity of the housing

A point light source comprising at least one light emitter.

[2] The point light source according to claim 1, wherein the luminous body is an LED or an LD, and a plurality of types having different emission wavelengths are arranged.

3. The point light source according to claim 2, wherein the luminous body is provided integrally with an optical filter corresponding to each luminous wavelength, and the luminous energy of each luminous body is emitted through each filter.

[4] A light scatterer is disposed on the inner surface of the housing, in the cavity, or both.

V. The point light source according to any one of claims 1 to 3.

[5] The point light source according to any one of claims 1 to 4, wherein an optical element for adjusting the trajectory of the emitted light beam is provided outside the housing with the vicinity of the light exit as a focal point or an object point.

[6] At least one of a light source and transmitted light, reflected light and scattered light of the light by the measurement object when the light of the light source power is applied to the measurement object, and fluorescence from the measurement object. An optical measuring device comprising a light detector for detecting

An optical measuring device comprising the point light source according to claim 1 as the light source.

[7] The light source is provided with a plurality of types of light emitters having different emission wavelengths, and a power supply device for emitting light from the light source selectively emits the light emitters having different emission wavelengths at different times. 7. The optical measurement device according to claim 6, wherein is a multicolor light source.

[8] In a lighting device that illuminates an object with light from a light source,

An illumination device comprising the point light source according to any one of claims 1 to 5 as the light source.

[9] The light source is provided with a plurality of types of light emitters having different emission wavelengths, and the power supply device for emitting the light emitters selectively emits the light emitters having different emission wavelengths at different times. 9. The lighting device according to claim 8, wherein the light source is a multicolor light source.