JP6512913B2 - Light irradiation device and measurement method of light transmission characteristics - Google Patents

Description

  The present invention relates to a light irradiation apparatus mainly used to investigate the light characteristics of skin and cells. In particular, the present invention provides a light irradiator capable of mixing light from a plurality of light sources and emitting the light from a plurality of emission ends. The present invention also provides a method of measuring light transmission characteristics using a light irradiation device.

  In the cosmetics industry, the effects of UV light on the skin have been considered. Therefore, products that reduce the influence of ultraviolet light have also been developed. On the other hand, little has been done about the influence of the skin on near infrared rays. However, near infrared rays are considered to affect the skin and cells, and experimental studies are required.

  In order to conduct such a study, it is necessary to have a light irradiation device capable of stably reproducing the correct conditions. The light source has fluctuations with respect to intensity and wavelength, and in order to investigate the influence on the skin and cells, it is necessary to be able to detect the presence or absence of the influence of the fluctuation. In addition, with regard to the effect on the skin, it can be expected that the light of a plurality of near infrared regions has different effects.

  There is also a demand to consider the effects of mixed light of infrared and ultraviolet light. Therefore, it is necessary to be able to emit mixed light in which light of a plurality of wavelengths is mixed. Furthermore, in the case of examining the light shielding property to light, it is necessary to irradiate the same light to a plurality of samples. This is to compare samples with and without the light blocking substance.

  In addition, although the light source is biased in intensity, it is desirable that the light irradiated to the sample be free from such intensity bias. This requirement eventually leads to the need to illuminate multiple samples with the same intensity and intensity distribution.

  With respect to such a new demand, as a conventional light irradiation apparatus, the thing of patent document 1 is known. In this method, light from a light source is divided into a plurality of lights using a branching lens, and a plurality of samples can be irradiated with light using an optical fiber.

  Patent Document 2 is a light beam irradiation apparatus suitable for heating for soldering, removal of a thin polyurethane wire coating, heating of a resin, and the like. Here, in order to remove the deviation of the light intensity distribution of the light source, it is a bundle fiber obtained by bundling a plurality of optical fiber strands, and the relative position at the output end of these optical fiber strands is the relative position at the incident end Using randomly arranged bundle fibers.

JP 2011-124374 A Unexamined-Japanese-Patent No. 04-105784

  The light irradiation apparatus of patent document 1 can irradiate several light from one light source. However, the bias of the distribution of the light intensity of the light source can not be suppressed. In addition, since light is branched from the same light source, the intensity of light is reduced at each output end. In addition, since light is split by a split lens, it is not easy to mix lights from a plurality of light sources.

  Even if there is a bias in the light intensity distribution at the entrance end, the bundle fiber disclosed in Patent Document 2 loses the bias at the exit end, and can emit averaged light. However, there is no disclosure or suggestion about mixing lights from a plurality of light sources or emitting the same light from a plurality of emitting ends.

  In particular, even if these conventional techniques are combined, it is not possible to obtain a light irradiation device which mixes light of different wavelengths and emits light from a plurality of emission ends.

  The present invention has been conceived in view of the above problems, and a light irradiation device capable of irradiating uniform light from a plurality of emitting ends and irradiating mixed light in which light of different wavelengths is mixed is provided. provide.

More specifically, the light irradiation device according to the present invention is
The arrangement of the optical fiber strands at the exit end is randomly arranged with respect to the entrance end of the optical fiber strand group obtained by bundling a plurality of optical fiber strands, and two or more of the entrance ends and the measurement target standard samples, a bundle fiber for at least three or more of said exit end is kicked set of light source stabilization guarantee,
A plurality of light source devices for emitting light to the incident end ;
A light sensor device disposed at the emission end;
The difference between the measured value of the dark spectrum in the state where light is not emitted from the light source device at the emission end for the light source stability guarantee and the measured value in the state where light is emitted from the emission end for the light source stability guarantee And a control device .

  The light irradiation device according to the present invention mixes light from a plurality of light source devices with a bundle fiber and emits light from a plurality of emission ends, so there is no need to handle complicated optical systems and it is easy to Installation and replacement of the light source device are possible.

  In addition, by using a plurality of light source devices of the same wavelength, even when a plurality of emitting ends are provided, the light intensity from each emitting end does not decrease. This is more economical than preparing a single high intensity light source device.

  In addition, by using light source devices having different wavelengths, mixed light of a plurality of wavelengths can be emitted. Also, by making the arrangement of the optical fiber strands of the bundle fiber of the input end and the output end random, it is possible to eliminate the bias of the distribution of the light intensity of the light source device at the output end.

  In addition, since it is possible to obtain a plurality of light having the same wavelength and the same intensity and no bias in the distribution of light intensity, it is possible to perform irradiation inspection under the same conditions, and if one emission end is used as a control The fluctuation of the light source device in the inside can be monitored, and a highly reliable inspection becomes possible.

  Further, in the light irradiation device according to the present invention, since the wavelength selection filter is inserted between the light source device and the bundle fiber, light of a desired wavelength can be irradiated. Further, by providing the light source device with a shutter, the light of the light source can be emitted only for a predetermined time.

It is a figure showing composition of a light irradiation device concerning the present invention. It is an enlarged view of the part of the collector of a light source device. It is a figure which shows the structure of a bundle fiber. It is a figure which shows an example of a structure of the light irradiation apparatus in the case of measuring a light transmission characteristic. It is a figure which shows the example of the wavelength characteristic of the light from a light source device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description illustrates one embodiment of the present invention, and may be modified without departing from the spirit of the present invention.

Embodiment 1
FIG. 1 shows the configuration of a light irradiation apparatus according to the present invention. The light irradiation device 1 includes a plurality of light source devices 10 and a bundle fiber 20. A plurality of light source devices 10 can be used. Here, the description will be continued as two (10a and 10b respectively). The light source devices 10 may emit light of the same wavelength or may emit light of different wavelengths.

  The type of the light source device 10 is not particularly limited. Any light source device capable of emitting light of a wavelength to be irradiated may be used. For example, a xenon lamp (xenon arc lamp) can be suitably used. This is because a continuous spectrum can be generated in a wide wavelength range from the ultraviolet region to the infrared region, and thus light of a desired wavelength can be obtained by using the filter 16.

  However, when the wavelength of light to be irradiated is predetermined, an LED (Light Emitting Diode) or a laser capable of generating light of that wavelength may be used. The following description will be made with the case where a xenon lamp is used as the light source device 10 as an example.

  The simple structure of the light source device 10 is shown in FIG. The light source device 10 is provided with a light source 12 and a light collector 14. This is to collect light at the incident end 20 in of the bundle fiber 20. The light emission source 12 is provided with two electrodes 12s and 12t facing each other. The electrodes 12s and 12t are arranged to overlap the optical axis 12a. The approximate center of the electrodes 12s and 12t can be regarded as the light emitting point 12p.

  The condenser 14 is configured of an elliptical mirror surface 14a and a spherical mirror surface 14b extended to the elliptical mirror surface 14a. The light emitting point 12p of the light emitting source 12 is disposed at the first focal point 14aa of the elliptical mirror surface 14a.

  The condenser 14 condenses the light from the light emitting point 12 p at the emission end 10 out so as to have a predetermined incident angle α with respect to the optical axis 12 a. This is because light can not pass through the bundle fiber 20 unless it is made smaller than the maximum incident angle θmax to the optical fiber strand 22 (see FIG. 3) described later.

As shown in FIG. 2, when a xenon lamp is used as the light source device 10 and the electrodes 12s and 12t are arranged to coincide with the optical axis 12a, the light from the light source device 10 is mainly orthogonal to the optical axis Horizontally). Then, the light is reflected by the elliptical mirror 14a. The amount of light on the optical axis 12a is in principle zero. Therefore, the light collector 14 produces a light beam having a large amount of light near the maximum incident angle θmax. A light beam produced by the light emitting point 12 p, the spherical mirror surface 14 b and the elliptical mirror surface 14 a is emitted from the emission end 10 out of the light source device 10. Thus, the combination of the light source 12 and the light collector 14 causes the light emitted from the light source device 10 to have a distribution in intensity.

  An optical filter 16 is disposed between the condenser 14 and the emission end 10 out. This is to attenuate wavelengths other than the desired wavelength light (here, ultraviolet light). In addition, a shutter 18 is provided on the optical axis 12a. The shutter 18 can be suitably used that can be opened and closed by an external control signal. Of course, the manual shutter 18 is not excluded.

  The incident end 20 in of the bundle fiber 20 is disposed at a position further away from the second focal point 14 ab of the elliptical mirror surface 14 a. The incident end 20 in of the bundle fiber 20 is the exit end 10 out of the light source device 10. That is, the exit end 10 out of the light source device 10 is connected to the entrance end 20 in of the bundle fiber 20. The distance L from the second focal point 14ab to the incident end 20in (the outgoing end 10out) may be a distance such that the light condensed by the second focal point 14ab spreads to about the area of the incident end 20in. It is for making light inject into the whole entrance end 20in.

  The bundle fiber 20 is a fiber provided with a plurality of incident ends 20 in and emission ends 10 out. The detailed configuration of the bundle fiber 20 is shown in FIG. The bundle fiber 20 is a collection of a plurality of optical fiber group 24 in which a plurality of optical fiber strands 22 are bundled. The optical fiber 22 is about 200 μm in diameter, and the material is not particularly limited. However, it is desirable that the light intensity loss of the wavelength of the light source used for inspection be small.

  The optical fiber group 24 is a bundle of several hundreds of optical fiber strands 22. The number of optical fiber strands 22 to be bundled here depends on the number of outgoing ends 20 out to be divided. Therefore, several thousands may be bundled. A plurality of the optical fiber group 24 are further bundled to form a bundle fiber 20. The bundled optical fiber group 24 has a mixing / branching portion 26 in the middle of the length direction. In the mixing / branching unit 26, all the optical fiber strands 22 of the optical fiber strand group 24 are mixed and branched into the number of the emission ends 20out.

  The mixing / branching unit 26 may randomly mix the bundle of the optical fiber group 24 and then branch it to the number of the emitting ends 20 out, or branch each optical fiber group 24 to the number of the emitting ends 20 out After that, the optical fiber strands 22 may be mixed so as to be random.

  FIG. 3 exemplifies the case where there are two incident ends (incident end 20ina and 20inb) and three exit ends 20out (emission ends 20outa, 20outb and 20outc). Of course, this is only an example, and the numbers of the incident end 20 in and the emission end 20 out are not limited thereto. The incident ends 20ina and 20inb correspond to the end faces of the optical fiber group 24a and 24b. The incident surfaces at the incident ends 20ina and 20inb are configured by aligning the end faces of the plurality of optical fiber strands 22 constituting the optical fiber strand group 24. The end face of the optical fiber strand 22 at the incident end 20ina is represented by a black circle, and the end face of the optical fiber strand 22 at the incident end 20inb is represented by a white circle.

  In the mixing branch portion 26, the optical fiber strands 22 of the optical fiber strand groups 24a and 24b are mixed and branched into three. At the emitting ends 20outa, 20outb, and 20outc, the other ends of the optical fiber 22 at the incident end 20ina (the end face is a black circle) and the other end of the optical fiber 22 at the incident end 20inb (the white circle at the end face) are randomly arranged.

  Here, “arranged randomly” means that light emitted from any of the emission ends 20 out and light incident from the incidence end 20 ina and light incident from the incidence end 20 inb are uniformly emitted. It means that the optical fiber strand 22 is disposed to such an extent that it can be determined that More specifically, the optical fiber strands 22 (black circles) at the incident end 20ina and the optical fiber strands 22 (white circles) at the incident end 20inb are uniformly disposed at any of the emission ends 20outa, 20outb, and 20outc, and as a result It says the state which can be considered that there is no difference in the intensity of the light irradiated.

  Further, in any emission end 20 out, the number of optical fiber strands 22 near the center of the end face of each incident end 20 in is the same as the number of optical fiber strands 22 in the periphery, and these optical fiber strands 22 It also means that they are uniformly arranged at the end face of the emitting end 20 out. Such an arrangement eliminates bias in the distribution of light intensity at the output end 10 out of each light source device 10, and the light emitted from the output end 20 out of the bundle fiber 20 is uniform light either at the center or the periphery It becomes strength.

  As described above, by arranging the optical fiber strands 22 of the respective optical fiber strands 24, the light emitted from the output end 20out is the light incident from the incident end 20ina and the light input from the incident end 20inb. , Can be injected as well. The light emitted from the output end 20out may be a mixture of the light from the input end 20ina and the light from the input end 20inb.

  In each output end 20out, the optical fiber 22 at the input end 20ina and the optical fiber 22 at the input end 20inb are mixed by the same number. However, the ratio may be changed. That is, the number of optical fiber strands 22 from the incident end 20ina may be larger than the number of optical fiber strands 22 from the incident end 20inb.

  In this case, the number of optical fiber strands 22 disposed at the incident end 20inb may be smaller than the number of optical fiber strands 22 disposed at the incident end 20ina. Further, the number of the optical fiber strands 22 may be equal to the number of the optical fiber strands 22 at the incident end 20 inb at the incidence end 20 inb, and the unnecessary optical fiber strands 22 may be cut at the mixing / branching unit 26. Here, the description will be continued assuming that the number of optical fiber strands 22 at the input end 20ina and the number of optical fiber strands 22 at the input end 20inb at the output end 20out are the same.

  The light emitted from the emission end 20 out configured in this way is output with the same intensity as the light incident from the incident end 20 ina and the light incident from the incident end 20 inb. It is possible to obtain substantially uniform light in which the bias of the intensity distribution is eliminated.

  Referring back to FIG. 1, the light source device 10 and the incident end 20 in of the bundle fiber 20 are respectively connected. The emission ends 20outa, 20outb and 20outc of the bundle fiber 20 are respectively fixed to a stand or the like (not shown). Then, the irradiation target 50 is disposed to face the emission end 20 out.

  Of course, the irradiation object 50 is not limited. For example, it may be a cell to be a test sample. When the irradiation target 50 is to be a cell, the well in which the cell is cultured is placed under the emitting end 20out. In the case of skin, the emitting end 20 out may be directly applied to the skin of the subject or the subject animal, respectively.

  Since there are a plurality of emitting ends 20 out, one can be used for monitoring. That is, it can irradiate, observing what kind of state the light irradiated to the irradiation object 50 is. At this time, since the light emitted from the emission end 20 out can be made equal in intensity, intensity distribution, mixing ratio of frequencies, etc., what kind of light was irradiated to the irradiation object 50 is an irradiation object. It can monitor without disturbing the light irradiation to the object 50 at all.

  In general, such measurement is performed by measuring the light from the light emitting end 20 out with the light sensor device 30 before light irradiation to confirm whether or not predetermined specifications are satisfied, and then light irradiation is performed. However, if such a procedure is taken, even if fluctuation such as intensity occurs in the light source device 10 during actual light irradiation, it can not be known. However, if the same light as the light irradiated to the irradiation target 50 can be monitored during irradiation, it is possible to perform highly reliable light irradiation.

  Therefore, in the light irradiation device 1 according to the present invention, the light sensor device 30 can be disposed at the emission end for this monitoring (provisionally assumed to be the emission end 20 outc). The light sensor device 30 can detect the intensity, the intensity distribution, or the fluctuation of the frequency of the light from the emission end 20outc. Also, a recording device 32 for recording the output of the light sensor device 30 may be connected. The light sensor device 30 includes a light sensor element 30a and a measuring device 30b.

  In addition, as shown in FIG. 1, you may attach an optical sensor apparatus (illustration is abbreviate | omitted) also to the other radiation | emission end 20outa and 20outb. This is to measure the degree of light absorption of the irradiation target 50.

  The light irradiation apparatus 1 according to the present invention may further have a controller 40. Here, as the controller 40, an MPU (Micro Processor Unit) having a clock fast enough for driving can be suitably used. As described above, the light source device 10 is provided with the shutter 18. The controller 40 controls the opening and closing of the shutter 18. The control of the shutters 18 allows the shutters 18 of the plurality of light source devices 10 to be separately controlled.

  More specifically, the controller 40 transmits an instruction signal Csa to the shutter 18a of the light source device 10a, and transmits an instruction signal Csb to the shutter 18b of the light source device 10b. The shutters 18a and 18b are opened and closed by the instruction signals Csa and Csb.

  According to this structure, all the shutters 18a and 18b can be simultaneously opened and closed, or the timings of opening and closing the shutters 18a and 18b of the plurality of light source devices 10 can be shifted by a desired time. The shutter 18 may be provided at the emission end 20 out. However, when the shutter 18 is provided at the emission end 20 out, the size of the emission end 20 out becomes bulky. Of course, the present invention does not exclude that the shutter 18 is provided at the exit end 20 out.

  The controller 40 may also receive the signal Ss from the measuring device 30 b of the light sensor device 30. The signal Ss may be the same as the signal recorded in the recording device 32. The controller 40 constantly monitors the signal Ss from the measuring device 30b, so that it can not be said that the constant light is irradiated because the intensity, the wavelength, etc. of the light being irradiated exceeds a predetermined threshold. If it can be determined, a notification signal to that effect may be output to the outside.

  The operation | movement is demonstrated about the light irradiation apparatus 1 which has the above structure. The light source devices 10a and 10b are powered on before light irradiation. This is to keep the temperature of the light source device 10 constant. It may be said that the light source device 10 is warmed up. When the warm-up of the light source device 10 is completed, the emission end 20 out and the irradiation object 50 are made to face each other. The distance between the emitting end 20 out and the irradiation object 50 is determined in advance according to the purpose of the irradiation. The irradiation time is also determined in advance. The irradiation time may be input to the controller 40.

  When the distance between the emitting end 20 out and the irradiation object 50 is determined, the user issues an instruction to the controller 40. The controller 40 opens the shutter 18 of the light source device 10 at a predetermined timing, and closes the shutter 18 after a predetermined time.

  During this time, the light sensor device 30 monitors the state of the emitted light and records it on the recording device 32. Therefore, it is possible to leave a light irradiation profile such as irradiation time, intensity, intensity distribution, and fluctuation of wavelength of the irradiated light. This profile may be measured at regular intervals, or may be measured continuously while emitting light.

  Further, in order to investigate the light shielding property of the irradiation object 50, pure water may be placed at the emission end 20outc, the irradiation object 50 may be placed at the emission ends 20outa and 20outb, and the illuminance of the transmitted light may be investigated. Pure water and glycerin are suitable as reference samples.

  By using the light source device 10 as a light source device of the same type, reduction in light intensity from one emission end 20 out is suppressed as compared with the case where a plurality of emission ends 20 out are taken out from one light source device 10 be able to.

  For example, by preparing three light source devices 10 and providing three emitting ends 20 out as described above, the light amount from one emitting end 20 out is made the same as the light amount from one light source device 10 be able to. This is far more economical than making one light source device 10 having a triple light emission amount.

  Further, by setting the light source device 10 as a light source device that emits light having different wavelengths, it is possible to irradiate the object 50 with the mixed light in which a plurality of wavelengths are mixed. By this, it is possible to confirm the behavior of the irradiation object 50 when the plurality of wavelengths are irradiated.

Second Embodiment
The structure of the light irradiation apparatus 2 which concerns on FIG. 4 at this Embodiment is shown. The light irradiation device 2 irradiates the light of the specified irradiance to the irradiation objects 50a and 50b, and measures the amount of transmitted light. As compared with the light irradiation device 1 of FIG. 1, the light irradiation device 2 is provided with light sensor devices 34 and 36 independent of the irradiation objects 50 a and 50 b respectively. The light sensor devices 34, 36 are respectively constituted by light sensor elements 34a, 36a and measuring devices 34b, 36b. Further, the light sensor devices 30, 34, 36 are connected to the controller 40. The controller 40 is also connected to a display 40a, an input device 40b such as a keyboard, and a recording device 32. The other configuration is the same as in FIG.

  The measuring devices 30b, 34b and 36b use a polychromator method capable of detecting light of many wavelengths at one time. This is to measure the frequency dependency of the light transmission characteristics of the irradiation targets 50a and 50b. Moreover, what can measure integral light quantity is used. "Irradiance" is radiant energy which flows per unit time with respect to unit area. Therefore, to know the irradiance, it is necessary to be able to measure the integrated light quantity.

  Next, a measurement method using the light irradiation device 2 will be described. The irradiation target 50a is an object to be measured. This may be, for example, a substance or composition that can protect light transmission used in cosmetics etc., or cells can be used. The irradiation target 50b corresponds to a so-called blank. The blank is a single slide glass when the irradiation target 50a is fixed on the slide glass. In the case where the irradiation target 50a is fixed in the solvent in the glass bottom petri dish, it is only the same glass bottom petri dish and the solvent. The blank can be said to be a jig for fixing the irradiation target 50a.

  Also, the blank may be a specific substance. For example, it may be a transparent body such as pure water or glass of a prescribed composition. In this case, the blank is also referred to as a standard sample.

  It is assumed that the light sensor devices 30, 34, 36 have been calibrated in advance for intensity and frequency characteristics using standard light. That is, for the same light, the light sensor devices 30, 34, 36 output the same intensity measurement value and the same frequency characteristic.

  The light source devices 10a and 10b are turned on in advance and warmed up. Next, the integration time is set. The integration time is determined in advance by the irradiation object 50 a and the diameter of the optical fiber used for the bundle fiber 20 used for the light irradiation device 2.

  Next, while the shutters 18a and 18b are closed, the light sensor devices 30, 34 and 36 perform measurement. This is called dark spectrum acquisition. The measurement results of the dark spectrum of the light sensor devices 30, 34, 36 are Pdo, Pdb, Pda. The dark spectrum may be considered as the offset of the measurement system.

  Next, the shutters 18a and 18b are opened and the light sensor devices 30, 34 and 36 perform measurement. At this time, the irradiation targets 50a and 50b have not been installed yet. The measurement results of the light sensor devices 30, 34, 36 at this time are Pfo, Pfb, Pfa.

  If the number of optical fiber strands 22 is the same in the bundle fiber 20, the measured values Pfo, Pfb, Pfa should be the same. However, in actuality, the number of optical fiber strands 22 may be different, or the broken ones may not be the same value. By measuring the measured values Pfo, Pfb and Pfa, the transmission efficiency of each bundle fiber 20 can be corrected later.

  Next, the irradiation targets 50a and 50b are respectively set under the emitting end 20outa and the emitting end 20outb. The irradiation target 50b is a blank. Then, irradiation is performed for a predetermined time, and measurement is performed by the light sensor devices 30, 34, and 36. The measured values at this time are Pto, Ptb and Pta.

  The light irradiation device 2 has two light source devices 10a and 10b. Therefore, light of two wavelength bands can be irradiated. Of course, from the principle of the bundle fiber 20, the light source device 10 may prepare three or more light sources and distribute them to four or more emission ends 20out. In the case of irradiating light of different wavelength bands, the irradiation light is configured by changing the filter 16 of the light source device 10.

  The case where near-infrared light is used as irradiation light is illustrated in FIG. In all the graphs of FIG. 5, the horizontal axis is the wavelength of the irradiation light, and the vertical axis is the irradiation light intensity (arbitrary unit). Here, near infrared light refers to light with a wavelength of 900 nm to 1700 nm. In FIG. 5, the solid line represents the intensity of the irradiated light having passed through the filter 16a, and the dotted line represents the intensity of the irradiated light having passed through the filter 16b. In FIG. 5A, the filters 16a and 16b of the light source devices 10a and 10b are both in the near infrared full band. Thus, the same filters 16a and 16b may be used.

  Further, FIG. 5B shows an example in which irradiation light of a wavelength of 900 nm to 1100 nm is produced by the filter 16a, and irradiation light of a wavelength of 1500 nm to 1700 nm is produced by the filter 16b.

  Further, as shown in FIG. 5C, a case is shown where irradiation light of wavelength 1200 nm ± 20 nm is produced by the filter 16a of the light source device 10a and irradiation light of wavelength 1500 nm ± 20 nm is produced by the filter 16b of the light source device 10b. Thus, the light irradiation device 2 can irradiate the light having the same intensity in the two wavelength bands to the irradiation object 50a and the irradiation object 50b which is a blank. Of course, the characteristics of the filter 16a and the filter 16b may be values other than this value.

  These measured values are recorded on the recording device 32 via the controller 40. These recorded data are processed at least as follows.

<Dark spectrum correction>
The measured values Ptb and Pta are measured by the light sensor device 34 and the light sensor device 36 when the irradiation object 50b and the irradiation object 50a are used. The measured value Ptb is a measured value when the irradiation object 50b is blank. The measurement value Pta is a measurement value when the irradiation object 50a is the measurement object.

  The measured values Pdb and Pda of the light sensor device 34 and the light sensor device 36 are measured values when no light comes in (dark spectrum). Therefore, subtracting the measured value of the dark spectrum from the irradiation objects 50a and 50b is a substantial measured value. That is, the controller 40 calculates the measurement value Ptb-Pdb of the substantially blank light transmission amount and the measurement value Pta-Pda of the light transmission amount of the irradiation object 50a as the correction value of the dark spectrum.

<Evaluation>
These measurement results can be subjected to an arbitrary evaluation process to give an evaluation result. As an example, for the measured value Pta-Pda of the irradiation target 50a and the measured value Ptb-Pdb of the blank, the intensities at the same wavelength are compared, and the difference or the ratio thereof is determined. In addition, integrated measurement values of a predetermined wavelength range may be compared with each other.

The measured value Pto−Pd o (the value obtained by compensating for the dark spectrum component) of the light sensor device 30 ensures the stability of the light source devices 10 a and 10 b during measurement. That is, if one or both of the light source devices 10a and 10b cause output fluctuation during measurement, it can be understood that the light quantity which is usually measured is different from the light quantity. Therefore, it is guaranteed that the measurement is performed while the light source devices 10a and 10b are stable. The information may be added to the evaluation so that the value of the light sensor device 30 does not change during measurement.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used as a light irradiation device using a plurality of light source devices in products such as cosmetics, medical drugs, glasses (coating of lenses), glass, glass building materials, films, clothes, and therapeutic devices.

Reference Signs List 1, 2 light irradiation device 10, 10a, 10b light source device 10 out emission end 12 light source 12a light axis 12p light emitting point 12s, 12t electrode 14 condenser 14a elliptical mirror surface 14aa , 16b filter 18, 18a, 18b shutter 20 bundle fiber 20in, 20ina, 20inb incident end 20out, 20outa, 20outb, 20outc outgoing end 22 optical fiber strand 24, 24a, 24b optical fiber strand group 26 mixing branch 30 optical sensor Device 30a Optical sensor device 30b Measuring device 32 Recording device 34, 36 Optical sensor device 34a, 36a Optical sensor device 34b, 36b Measuring device 40 Controller 40a Display 40b Input device 50 Irradiation object 50a, 50b Irradiation object

Claims (7)

The arrangement of the optical fiber strands at the exit end is randomly arranged with respect to the entrance end of the optical fiber strand group obtained by bundling a plurality of optical fiber strands, and two or more of the entrance ends and the measurement target standard samples, a bundle fiber for at least three or more of said exit end is kicked set of light source stabilization guarantee,
A plurality of light source devices for emitting light to the incident end ;
A light sensor device disposed at the emission end;
The difference between the measured value of the dark spectrum in the state where light is not emitted from the light source device at the emission end for the light source stability guarantee and the measured value in the state where light is emitted from the emission end for the light source stability guarantee light irradiation apparatus, characterized in that it comprises a control device for.   The light irradiation device according to claim 1, wherein a wavelength of light emitted by one of the plurality of light source devices is different from a light wavelength emitted by another light source device. Light irradiation device according to any one of claims 1 or 2, characterized in that a wavelength selective filter positioned between the light emitting points and the incident end of the light source device. The light irradiation device according to any one of claims 1 to 3 , wherein a shutter is disposed between a light emitting point of the light source device and the incident end. The light irradiation device according to claim 4 , further comprising a controller capable of opening and closing the shutter. The light irradiation apparatus according to claim 5 , wherein the controller opens and closes the shutter by a timer. A step of measuring a dark spectrum in a state in which the irradiation light is not emitted from the emission end of the light irradiation device according to claim 1;
Placing said irradiation morphism object and blank exit end of the light irradiation device,
Irradiating the light from the light source device onto the object to be irradiated and the blank through the bundle fiber;
Integrating and measuring the light passing through the object to be irradiated and the blank for each light emitted from the light source device ;
The measuring method of the light transmission characteristic of the irradiation target object which has the process of deducting the measured value of the said dark spectrum from the result of the said integral measurement.