Patent Publication Number: US-2022221396-A1

Title: Light source device and optical device

Description:
TECHNICAL FIELD 
     The present invention relates to a light source device and an optical device. 
     BACKGROUND ART 
     There is known an optical measuring device such as an analyzing device or the like which measures optical characteristics of a specimen accommodated in a container (see, e.g., PTL 1 and PTL 2). 
     As a light source of a typical optical measuring device, for example, a halogen lamp or the like is used. In this halogen lamp, a filament performs high temperature light emitting by electrification. The spectrum of light from the filament which has performed high temperature light emitting is determined by the temperature of the filament according to light emission principles of black body radiation. In the halogen lamp, the temperature of the filament can be set to a temperature higher than that in an incandescent lamp, and the halogen lamp has a color-developing light which is bright, close to sunlight, and has a continuous spectrum, and moreover the halogen lamp is suitable as the light source for the optical measuring device. 
     CITATION LIST 
     Patent Literature 
     [PTL 1] Japanese Patent Application Publication No. 2008-2849 
     [PTL 2] Japanese Patent Application Publication No. 2016-40528 
     SUMMARY OF INVENTION 
     Technical Problem 
     However, for example, when a current value of a current to the filament is reduced and the temperature of the filament is set to a low temperature in order to increase the life of the lamp, there may be a case where, in light emitted from the filament in an electrification state, the intensity (light amount) of light in a wavelength band required for optical measurement or the like is insufficient, particularly the intensity of light in a short wavelength band of about 300 nm to 500 nm is insufficient. 
     Incidentally, PTL 2 describes an analyzing device which analyzes an amount of an ingredient contained in a sample by combining light from a halogen lamp and light from an ultraviolet LED light source by a prism including a reflecting part which reflects light in an ultraviolet region, and irradiating the sample with the combined light. However, in the analyzing device described in PTL 2, complicated optical axis adjustment is required for the halogen lamp and the ultraviolet LED light source, etc. For example, in an optical device having a dichroic mirror DM shown in  FIG. 26 , light emitted from a filament  111   z  of a halogen lamp  11   z  is radiated to a sample  91  via a measuring optical system lens LE 1  and the dichroic mirror DM, light emitted from an LED light source  12   z  passes through a lens LE 2 , and is reflected by the dichroic mirror DM which is arranged between the sample  91  and the lens LE 1 , and moreover is radiated to the sample, and light having passed through the sample  91  enters a measurement spectrometer  220   z  via a measuring optical system-side lens LE 3 . That is, in an example shown in  FIG. 26 , complicated optical axis adjustment is required for the dichroic mirror DM, the LED light source  12   z,  the halogen lamp  11   z,  and the lenses LE 1 , LE 2 , and LE 3 . 
     Solution to Problem 
     A light source device of the present invention includes at least the following configuration. 
     A light source device includes a first light source, and 
     a second light source capable of irradiating the first light source with light having a wavelength band narrower than a wavelength band of light by the first light source, wherein 
     the first light source is configured to emit combined light of the light from the first light source and the light from the second light source, which is diffused and reflected on a surface of the first light source, to an irradiated object. 
     In addition, an optical device of the present invention includes the light source device according to the present invention described above, and an optical measuring part which performs optical measurement of an irradiated object by using combined light from the light source device. 
     Advantageous Effects of Invention 
     According to the present invention, it is possible to provide the light source device capable of handling the combined light of the light from the first light source and the narrowband light from the second light source as if the combined light were single light from the first light source with a simple structure of which accuracy is not required. 
     In addition, according to the present invention, it is possible to provide the light source device capable of implementing an increase in the life of the filament, and emitting the combined light of the light from the electrified filament and the light in the desired wavelength band by the semiconductor light source. 
     Further, according to the present invention, it is possible to provide the optical device such as the optical measuring device including the above light source device. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a conceptual view showing a light source device according to an embodiment of the present invention. 
         FIG. 2  is a view showing an example of the light source device according to the embodiment of the present invention. 
         FIG. 3  is a view showing an example of an optical device (optical measuring device) including the light source device according to the embodiment of the present invention. 
         FIG. 4  is a view showing an example of the light source device including a plurality of semiconductor light sources which have different peak wavelengths or different center wavelengths of light. 
         FIG. 5  is a view showing examples of an LED power supply and a halogen lamp power supply controlled by a light source control part of the light source device according to the embodiment of the present invention. 
         FIG. 6  is a view showing an example of temperature change of a spectral distribution of light emitted from a filament lamp (first light source) and an example of a spectral distribution of light emitted from a semiconductor light source (second light source). 
         FIG. 7  is a view showing an example of a spectrum at a color temperature of 3100 K of a halogen lamp and an example of a spectrum at a color temperature of 2850 K of the halogen lamp. 
         FIG. 8  is a view showing an example of a light amount target when LED light and lamp light are superimposed on each other. 
         FIG. 9  is a view showing a specific example of the light source device according to the embodiment of the present invention. 
         FIG. 10( a )  is a view for explaining an example of light from a filament, and is a photograph showing an example of the filament in a high temperature light emitting state. 
         FIG. 10( b )  is a view for explaining an example of light from the filament, and is a photograph showing an example of the filament at the time of non-electrification which is irradiated with LED light. 
         FIG. 10( c )  is a view for explaining an example of light from the filament, and is a photograph showing an example of the filament in the high temperature light emitting state by electrification which is irradiated with the LED light. 
         FIG. 11  is a view showing an example of the spectrum of combined light by the halogen lamp and an LED light source shown in  FIG. 10( c ) . 
         FIG. 12  is a view showing an example of the spectrum of light only from the halogen lamp of a first comparative example shown in  FIG. 10( a ) . 
         FIG. 13  is a view showing an example of the spectrum of combined light when the halogen lamp serving as the first light source is irradiated with LED light having a wavelength of 340 nm. 
         FIG. 14  is a view showing an example of a measurement result of combined light from the light source device which has the halogen lamp, an LED with a wavelength of 340 nm, and an LED with a wavelength of 460 nm. 
         FIG. 15  is an arrangement diagram showing an example of the optical device having the light source device according to the embodiment of the present invention in which surface reflection on a bulb of the filament lamp does not cause stray light. 
         FIG. 16  is a view showing an example of an irradiation range of LED light and an example of a utilization range which is utilized in optical measurement by an optical measuring part (detecting device) in the filament of the filament lamp of the optical device shown in  FIG. 15 . 
         FIG. 17  is a view showing an arrangement example in which surface reflection on the bulb of the filament lamp of a comparative example causes stray light. 
         FIG. 18  is a view showing an example of the optical device having the light source device according to the embodiment of the present invention in which an angle of the filament shown in  FIG. 15  and an angle of the bulb shown in  FIG. 15  are adjusted and stray light is thereby reduced. 
         FIG. 19( a )  is a view showing an example of the light source device according to an embodiment of the present invention, and is a view showing an example of the filament lamp which has a flat coil filament. 
         FIG. 19( b )  is a view showing an example of the light source device according to an embodiment of the present invention, and is a view showing an example of the filament lamp which has a double-ended flat coil. 
         FIG. 19( c )  is a view showing an example of the light source device according to an embodiment of the present invention, and is a view showing an example of the light source device including the filament lamp shown in  FIG. 19( a ) . 
         FIG. 20( a )  is a view showing an example of the light source device according to an embodiment of the present invention, and is a view showing an example of the filament lamp which has a round coil filament. 
         FIG. 20( b )  is a view showing an example of the light source device according to an embodiment of the present invention, and is a view showing an example of the filament lamp having a double-ended round coil. 
         FIG. 20( c )  is a view showing an example of the light source device according to an embodiment of the present invention, and is a view showing an example of the light source device including the filament lamp shown in  FIG. 20( a ) . 
         FIG. 21  is a top view showing an example of the optical device including the light source device according to an embodiment of the present invention. 
         FIG. 22  is a side view showing an example of the optical device including the light source device shown in  FIG. 21 . 
         FIG. 23  is a view showing an example of the light source device which irradiates a white LED with light by a UV wavelength LED, and emits combined light of light reflected on the white LED and light from the white LED. 
         FIG. 24  is a view for explaining synthetic light of the light source device shown in  FIG. 23 . 
         FIG. 25  is a view showing a measurement result of the combined light from the light source device shown in  FIG. 23 . 
         FIG. 26  is a view showing an optical device (conventional art) having a dichroic mirror. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A light source device according to an embodiment of the present invention has a first light source, and a second light source capable of irradiating the first light source with light having a wavelength band narrower than a wavelength band of light by the first light source, wherein the first light source is configured to emit combined light of the light from the first light source and the light from the second light source which is diffused and reflected on a surface of the first light source to an irradiated object. 
     In addition, the optical device according to the present invention has the light source device described above, and an optical measuring part which performs optical measurement of an irradiated object by using combined light from the light source device. 
     Further, the first light source is arranged on an optical axis passing through the irradiated object and the optical measuring part. 
     In addition, a light source device according to an embodiment of the present invention has a first light source including a filament capable of heating and light emitting by electrification, and a second light source capable of irradiating the filament of the first light source with light having a wavelength in a band narrower than a band of a wavelength of light by the heating and light emitting of the first light source. The first light source of the light source device is configured to emit, from the filament, combined light of light from the filament in a state of the heating and light emitting and the light from the second light source which is diffused and reflected on a surface of the filament. 
     Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments of the present invention include contents shown in the drawings, but the embodiments thereof are not limited only to the contents. Note that, in the following description of each drawing, portions common to parts which have been already described are designated by the same reference numerals, and the duplicate description thereof will be partially omitted. 
     First Light Source is Filament Lamp and Second Light Source is Semiconductor Light Source 
       FIG. 1  is a conceptual view showing a light source device  10  according to an embodiment of the present invention.  FIG. 2  is a view showing an example of the light source device  10 . 
     As shown in  FIGS. 1 and 2 , the light source device  10  according to the embodiment of the present invention has a first light source  11  and a second light source  12 . 
     The first light source  11  is, e.g., a filament lamp including a filament  111  capable of heating and light emitting (capable of high temperature light emitting) by electrification. As the first light source  11 , it is possible to use, e.g., a halogen lamp or an incandescent lamp. 
     The filament lamp serving as the first light source  11  has the filament  111  and a hollow bulb  112 , and the filament  111  is accommodated in the bulb  112 . The filament  111  is formed of tungsten or the like, and the bulb  112  is formed of a predetermined material such as light transmitting quartz glass. 
     In the hollow bulb  112 , inert gas such as krypton gas or xenon gas is sealed, and the inert gas contains a very small amount of halogen (iodine, bromine, or the like). 
     In the present embodiment, a halogen lamp is used as the first light source  11 . 
     The wavelength band of light emitted from the halogen lamp in a high temperature light emitting state by electrification is, e.g., about 300 nm to 3000 nm, and the spectrum of the light is a continuous spectrum and shifts such that a peak wavelength is reduced as the temperature of the filament is increased. Specifically, the peak wavelength is about 1160 nm when the filament temperature of the halogen lamp is 2500 K (kelvin), the peak wavelength is about 1070 nm when the filament temperature is 2700 K, and the peak wavelength is about 970 nm when the filament temperature is 3000 K. 
     As the second light source  12 , it is possible to use a semiconductor light source such as, e.g., an LED (Light emitting diode) element, an LD (Laser Diode) element, or an organic EL (OEL: Organic electro-luminescence) element. 
     The second light source  12  is capable of irradiating the filament  111  of the first light source  11  with light having a wavelength in a band narrower than that of a wavelength of light by heating and light emitting of the first light source. 
     In the case where the LED light source is used as the second light source  12 , a peak wavelength or a center wavelength has, e.g., a value in a range of 350 to 730 nm, and a half width is about 20 nm to about 100 nm. In addition, the spectrum width (full width at half maximum) of the wavelength band of light emitted from the organic EL light source serving as the second light source  12  is about 70 nm to 100 nm. 
     The second light source  12  is configured to irradiate the filament  111  of the light source  11  with emitted light. In an example shown in  FIG. 1 , the semiconductor light source serving as the second light source  12  is arranged on a board. 
     In the example shown in  FIG. 1 , a condensing optical system is provided between the filament  111  of the first light source  11  and the second light source  12 . The condensing optical system is configured to condense light emitted from the second light source  12  on whole or a part of the filament  111  of the first light source  11 . The condensing optical system is, e.g., a condensing lens  13  or a reflecting member (mirror). 
     As shown in  FIGS. 1 and 2 , the first light source  11  is configured to emit, at least from the filament  111 , combined light of light from the filament  111  in the state of heating and light emitting (high temperature light emitting state) and light from the second light source  12  which is reflected on the surface of the filament  111 . 
     The filament lamp such as the halogen lamp serving as the first light source  11  shown in  FIG. 2  has the filament  111 , the bulb  112 , and leads  113  ( 113   a,    113   b ). 
     The filament  111  is a single coil or a double coil filament. In addition, one or a plurality of the filaments  111  may be arranged in the bulb  112 . 
     In an example shown in  FIG. 2 , in the hollow bulb  112  which is long in a longitudinal direction, the coil-shaped filament  111  is arranged along the longitudinal direction. 
     Note that an electric wire  111   w  pulled out from one end part of the filament  111  is electrically connected to the lead  113   a  formed into a crank shape, and an electric wire  111   w  pulled out from the other end part is electrically connected to the lead  113   b.    
     The leads  113  electrically connected to the filament  111  are extended to the outside of the bulb  112  via a sealing member (not shown). To each lead  113 , a current for turning on the lamp is supplied. 
     Light emitted from the semiconductor light source serving as the second light source  12  is radiated to whole or a part of the filament  111  of the first light source  11  and is reflected on the surface of the filament  111 , and combined light of the reflection light and light by high temperature light emitting which is emitted from the filament  111  by electrification is emitted toward an irradiated object (a sample or a detecting device functioning as an optical measuring part) from the filament  111 . 
     The reflection light reflected on the filament  111  includes diffuse reflection light and specular reflection light. The reflection light is specified by the shape and surface state of the filament  111 , an angle of incidence of light radiated to the filament  111  from the second light source  12 , and the size of an irradiation region. 
     In the light source device  10  according to the present invention, the shape and surface state of the filament  111 , the angle of incidence of light radiated to the filament  111  from the second light source, and the size of the irradiation region are preferably optimized such that the intensity of the reflection light contributing to the combined light emitted from the filament  111  toward the irradiated object is increased. 
     The length of the filament  111  in the longitudinal direction is set to a predetermined length. 
     In addition, an angle θ formed by a line which is orthogonal to the longitudinal direction of the filament  111  and passes through substantially the center of the filament  111  (an optical axis LA which passes through the first light source  11  (filament) and the irradiated object), and a direction of incidence of light which is emitted from the second light source  12  and becomes incident on the filament  111  is specified so as to fall within an angle range of not less than 0° and not more than 90° and preferably within an angle range of not less than about 20° and not more than 70°. 
     That is, the light source device  10  is configured such that the light from the second light source  12  becomes incident on the filament  111  from the side of the emission of the combined light of the filament  111 . 
     The irradiated object irradiated with the combined light may be arranged on the optical axis, or may also be arranged at a position at which the intensity of a specular reflection light component in the combined light is increased. 
     A direction along the line which is orthogonal to the longitudinal direction of the filament  111  and passes through substantially the center of the filament  111  may be different from the emission direction of the combined light. In addition, the optical axis LA which passes through the first light source  11  (filament) and the irradiated object does not need to be orthogonal to the longitudinal direction of the filament  111 . 
     In addition, as described above, the first light source  11  has the bulb  112  in which the filament  111  is accommodated. The bulb  112  has a first light transmission part  112 Ra (light transmission portion) which transmits light from the second light source  12  arranged outside the bulb  112  into the bulb  112 , and a second light transmission part  112 Rb (light transmission portion) which transmits synthetic light emitted from the filament  111  to the outside of the bulb  112 . 
     Note that, in the bulb  112 , a region other than the first light transmission part  112 Ra and the second light transmission part  112 Rb described above may be a light interrupting part or a light reflecting part, and may also be a light transmission part which transmits light. 
     In addition, the first light transmission part  112 Ra and the second light transmission part  112 Rb described above of the bulb  112  may be provided in separate regions of the bulb  112 , may be provided in the same region, or may also be provided so as to overlap each other. 
     In addition, the first light source  11  may have rotation angle adjusting means capable of adjusting the rotation angle of the filament  111  with a longitudinal axis of the filament lamp used as a rotation axis. That is, in the case where one or a plurality of the filaments  111  having a desired shape such as single coil or double coil filaments are arranged in the bulb  112  of the filament lamp, by optimally adjusting the rotation angle, it is possible to perform adjustment such that light from the semiconductor light source (the second light source  12 ) is reflected by one or a plurality of the filaments  111 , and the intensity of the combined light is thereby increased. 
     Further, incidence angle adjusting means capable of adjusting the angle of incidence of light from the second light source  12  on the filament  111  may be provided in the first light source  11  or the second light source  12 . It is possible to easily adjust the angle of incidence. 
     In addition, light receiving means (a light receiving element or an imaging element) for receiving combined light or light from the first light source  11  or the second light source  12  may be provided and, based on a light reception result of the light receiving means, a light source control part may control the rotation angle adjusting means and the angle adjusting means such that the intensity of the combined light in a predetermined wavelength band is increased. 
     Further, in the light source device  10 , a reflecting member which reflects the above-described diffuse reflection light by the filament  111  toward the irradiated object may be arranged around the filament  111 . That is, as the shape of the reflecting member, it is possible to adopt any shape such as a flat shape or a paraboloid shape. 
       FIG. 3  is a view showing an example of an optical device  100  (optical measuring device) including the light source device  10  according to the embodiment of the present invention. 
     The optical device  100  has the light source device  10 , a filter  211 , a lens  212 , a lens  213 , a lens  214 , a lens  215 , and a detecting device  220  serving as an optical measuring part. 
     In the optical device  100 , after the sample  91  serving as the irradiated object accommodated in a container  92  is irradiated with light (combined light) emitted from the light source device  10  via the filter  211 , the lens  212 , and the lens  213 , light transmitted through the sample  91  enters the detecting device  220  serving as the optical measuring part via the lens  214  and the lens  215  which serve as light guiding optical systems. 
     In the detecting device  220 , light having passed through a pinhole  221  is dispersed by a grating  222  (diffraction grating) which disperses light into lights having individual wavelengths, the lights having the individual wavelengths obtained by dispersion by the grating  222  are received by a light receiving device  223  (a light receiving element or the like), and predetermined optical measurement processing related to the sample is performed by a computer (not shown) serving as an analyzing device based on a signal indicative of a light reception result of the light receiving device  223 . 
     Note that the optical device  100  is not limited to the above embodiment, and any device which uses the combined light from the light source device  10  according to the present invention may be used. 
     Specifically, the light source device  10  shown in  FIG. 3  has the first light source  11 , the second light source  12 , the condensing lens  13  and the reflecting part  14  (mirror) which serve as the optical condensing systems, a light receiving part  15 , a display input part  16 , and a light source control part  18 . 
     The light source control part  18  is a computer including a CPU and a storage part, and collectively controls individual components of the light source device  10 . In addition, the light source control part  18  may have a power supply circuit which supplies power to the first light source  11 , and a power supply circuit which supplies power to the second light source  12 . 
     The light receiving part  15  is, e.g., a light receiving element or an imaging element, and receives light from the filament  111  of the first light source  11  or the second light source  12  for light source adjustment and outputs a signal indicative of a light reception result to the light source control part  18 . 
     The display input part  16  is, e.g., a switch, a button, a touch panel, or a display device, and has functions as an input part and a display part. Note that, with regard to the display input part  16 , the input part and the display part may be provided separately. 
     The light source control part  18  controls the first light source  11  and the second light source  12 . This light source control part  18  performs processing of switching, in response to a signal from the input part, between a first mode for performing control in which a current having a first current value is applied to the filament  111  of the first light source  11  (filament high temperature light emitting state) and the second light source  12  is brought into a non-driving state, and a second mode for performing control in which a current having a second current value which is less than the first current value is applied to the filament  111  of the first light source  11  (filament low temperature light emitting state) and the filament  111  is irradiated with light emitted from the second light source  12 . 
     That is, only light by high temperature light emitting is emitted from the filament  111  in the high temperature light emitting state of the first light source  11  in the first mode, combined light of light by high temperature light emitting of the filament  111  of the first light source  11  and light from the second light source  12  is emitted from the filament  111  in the second mode, and it is possible to provide the light source device  10  capable of easily switching between the first mode and the second mode. 
       FIG. 4  is a view showing an example of the light source device  10  including a plurality of semiconductor light sources having different peak wavelengths or different center wavelengths of light. 
     The second light source  12  shown in  FIG. 4  includes a plurality of the semiconductor light sources capable of emitting lights having different peak wavelengths or different center wavelengths. Specifically, for example, a semiconductor light source  12 A emits light including a wavelength band in which the peak wavelength or the center wavelength is λa [nm], a semiconductor light source  12 B emits light including a wavelength band in which the peak wavelength or the center wavelength is λb [nm], and a semiconductor light source  12 C emits light including a wavelength band in which the peak wavelength or the center wavelength is λc [nm]. 
     Note that, while  FIG. 4  shows an example of three semiconductor light sources, the second light source  12  may include two or more semiconductor light sources. 
     The light source control part  18  performs control such that, among a plurality of the semiconductor light sources, any one or two or more semiconductor light sources are driven and the filament  111  of the first light source  11  is irradiated with lights having different peak wavelengths. 
       FIG. 5  is a view showing examples of an LED power supply  182  (second light source power supply) and a halogen lamp power supply  181  (first light source power supply) which are controlled by the light source control part  18  of the light source device according to the embodiment of the present invention. 
     For example, high stability (temporal stability or the like) is required of the light source device for biochemical analysis. 
     In the halogen lamp serving as the first light source  11 , a resistance value when the halogen lamp is turned on is stabilized, and hence the halogen lamp can emit light having extremely stable intensity in voltage control and current control. This is because a difference between the filament temperature when the halogen lamp is turned on and the ambient temperature of the installed lamp is extremely large and, even when the temperature environment of the device or the like changes to a certain degree, an influence on the filament temperature is extremely small and change of electric characteristics is also small. 
     The LED element serving as the second light source  12  is basically a voltage element and the light emission intensity of the LED element is proportional to a current value, and hence the LED element is subjected to current control. Light emission efficiency is significantly dependent on the temperature of the LED element, and hence it is preferable to perform delicate temperature control or feedback control by sensing light output in order to stabilize the light emission efficiency. 
     That is, the light source device according to the present invention preferably has means for reducing fluctuation over time of the light emission intensity of the LED element serving as the second light source  12  (reduction tool of fluctuation over time). 
     The reduction tool of fluctuation over time may perform drive current control of the LED element and, specifically, as the drive current control, for example, light from the LED element may be detected by a light receiving device (not shown) and feedback control may be performed on the drive current of the LED element such that a detection value of the light receiving device becomes a set value (a specific value or a range). 
     In addition, control means of fluctuation over time may perform element temperature control and, specifically, as the element temperature control, element temperature is controlled such that the temperature of the LED element serving as the second light source becomes a set value (a specific value or a range) by using a thermoelectric element such as, e.g., a Peltier element. 
     Further, the control means of fluctuation over time may further reduce the fluctuation over time of the light emission intensity of the LED element serving as the above-described second light source  12  by combining the drive current control and the element temperature control. 
     Note that, in the optical measuring device, according to predetermined specifications, reaction time is set to 10 minutes, and a difference between absorbance when a reagent is charged and absorbance after a lapse of 10 minutes is measured. Accordingly, the fluctuation of the light emission intensity in the 10 minutes is observed as the fluctuation of the measurement value of the absorbance. The fluctuation of required absorbance of 10{circumflex over ( )}(−4) or less corresponds to the light intensity fluctuation of 2.3×10{circumflex over ( )}(−4) in the vicinity of a transmittance of 100%. 
       FIG. 6  is a view showing an example of temperature change of the spectral distribution of light emitted from the filament lamp (first light source  11 ) in the state of heating and light emitting by electrification, and an example of the spectral distribution of light emitted from the semiconductor light source (second light source  12 ). 
     The wavelength band of light emitted from the halogen lamp in the state of heating and light emitting by electrification is, e.g., about 300 nm to 3000 nm, and  FIG. 6  shows the wavelength region of about 300 nm to about 900 nm. The spectral distribution shifts such that the peak wavelength of light emitted from the halogen lamp is reduced as the temperature of the filament is increased. 
     For example, in an example shown in  FIG. 6 , it is assumed that the wavelength bands required for measurement by the detecting device  220  serving as the optical measuring part are in the vicinities of 900 nm, 730 nm, 600 nm, and 480 nm. 
     In the case where the temperature of the filament  111  of the first light source  11  is set to a low temperature in order to increase the life of the filament  111 , e.g., in the case where the temperature of the filament is reduced from 3200 K to 2600 K, the intensity of the wavelength band required for measurement is reduced, and there is a possibility that adequate optical measurement cannot be performed. 
     In the light source device  10  of the present invention, the filament  111  is irradiated with light having a peak wavelength of 900 nm, 730 nm, 600 nm, or 480 nm which is emitted from the second light source  12  such that the intensity of each wavelength region described above of combined light emitted from the filament  111  becomes the intensity required for the measurement, and the combined light having the intensity of the desired wavelength region is thereby emitted from the filament  111  in the state of heating and light emitting by electrification. 
       FIG. 7  is a view showing an example of a spectrum at a color temperature of 3100 K of the halogen lamp and an example of a spectrum at a color temperature of 2850 K thereof.  FIG. 8  is a view showing an example of a light amount target when LED light and lamp light are superimposed on each other. The light amount target in  FIG. 8  indicates a spectrum region which is insufficient for the halogen lamp used in optical measurement, and a target value to which light intensity is to be increased. 
     In addition, the detecting device  220  serving as the optical measuring part such as a biochemical automatic analyzing device measures intensities of lights having a plurality of wavelengths ranging from ultraviolet light to ultrared light and performs optical measurement such as biochemical analysis, and hence a predetermined light intensity is required at each wavelength. For example, as a specific example, in the case of Clinical Chemistry Analyzer CA-800 (manufactured by FURUNO ELECTRIC CO., LTD.), measurement is performed for 13 wavelengths including wavelengths of 340, 380, 415, 450, 478, 510, 546, 570, 600, 660, 700, 750, and 800 nm (see, e.g., the home page of FURUNO ELECTRIC CO., LTD. https://www.furuno.com/jp/products/ClinicalChemistryAnalyzer/CA-800). In the case of Hitachi Automatic Analyzer 3500 (manufactured by Hitachi Hi-Tech Corporation.), measurement is performed for 12 wavelengths including wavelengths of 340, 405, 450, 480, 505, 546, 570, 600, 660, 700, 750, and 800 nm (see, e.g., the home page of JACLaS Japanese Association of Clinical Laboratory Systems https://jaclas.or.jp/Product/index?id=92126). Note that the detecting device  220  is not limited to the above specific examples. 
     For example, in the case where the color temperature of 3100 K of the halogen lamp is reduced to the color temperature of 2850 K, as shown in  FIGS. 7 and 8 , the light intensity at each wavelength mentioned above is reduced. 
     In the present invention, for example, as shown in  FIG. 8 , it is possible to compensate a shortage of the light intensity at the wavelength of 340 nm by the halogen lamp serving as the first light source (compare the color temperature of 2850 K with the color temperature of 3100 K) with the LED light of the second light source. In addition, the light intensities at other wavelengths may be strengthened by the LED light from the second light source in accordance with a required value. 
     Note that the life of the halogen lamp serving as the first light source is about 1500 hours in the case where the halogen lamp is continuously operated at the color temperature of 3100 K, and the life thereof is about 20000 hours in the case where the color temperature is reduced to the color temperature of 2850 K and the halogen lamp is continuously operated. 
     That is, the light source device according to the present invention can implement, with a simple configuration, an increase in the life of the first light source, and compensate the shortage of the light intensity at the wavelength used in light measurement with light from the second light source when the first light source is driven at a relatively low color temperature. 
     Note that the light source device  10  is not limited to the above-described embodiment, and the light source device  10  may also be configured to emit light having one or a plurality of peak wavelengths from the semiconductor light source serving as the second light source  12  so as to compensate light in a wavelength band required for the measurement. 
       FIG. 9  is a view showing a specific example of the light source device according to the embodiment of the present invention. 
     The inventors of the present application actually fabricated the light source device in order to determine effects by the light source device according to the present invention, as shown in  FIG. 9 . 
     In the example shown in  FIG. 9 , as the second light source  12 , a plurality of LED elements capable of emitting light having a peak wavelength of 460 nm were arranged on a board at substantially regular intervals in a matrix such that an outer shape was formed into a substantially circular shape. 
     The condensing lens  13  is arranged between the filament lamp serving as the first light source  11  and the LED light source (LED elements) serving as the second light source  12 , and the filament of the filament lamp serving as the first light source  11  in the high temperature light emitting state is irradiated with light emitted from the LED light source with the condensing lens  13 . Then, combined light of light emitted from the filament in the high temperature light emitting state and reflection light of light from the LED light source was imaged with an imaging device (not shown). In addition, the combined light was dispersed by a spectral device (not shown), and the intensity at each wavelength (relative intensity) was measured. 
     Note that, for comparison, only a filament lamp (halogen lamp) in the high temperature light emitting state which served as a light source device of a first comparative example was prepared (in a state in which irradiation with the LED light was not performed), and light emitted from the halogen lamp was imaged similarly with an imaging device (not shown). In addition, the light emitted from the halogen lamp was dispersed by a spectral device (not shown), and the intensity at each wavelength (relative intensity) was measured. 
     Further, the filament of the halogen lamp in a non-electrification state was irradiated with light from the LED light source serving as the second light source  12 , and reflection light was imaged similarly with an imaging device (not shown). 
     Emission Image of Light from Filament 
     &lt;First Comparative Example 
     As shown in  FIG. 10( a ) , in the case where the electrified filament is brought into the high temperature light emitting state, light corresponding to the temperature of the filament is emitted from the filament. Note that, in an example shown in  FIG. 10( a ) , the filament is not irradiated with light from the semiconductor light source. 
     Second Comparative Example 
     As shown in  FIG. 10( b ) , in the case where the filament which is not electrified is irradiated with light from the LED light source, the light is reflected on the surface of the filament, and is emitted from the filament. Note that it is preferable to perform setting such that whole or a part of the filament is irradiated with light from the LED light source. 
     Light Source According to Present Invention 
       FIG. 10( c )  is a photograph showing an example of combined light of light which is emitted from the semiconductor light source (LED light source) and radiated to the filament in the high temperature light emitting state by electrification, and is reflected on the filament, and light by high temperature light emitting of the filament. It was possible to determine that the combined light was emitted from the coil-shaped filament. 
       FIG. 11  is a view showing an example of the spectrum of combined light of light by the halogen lamp in the state of heating and light emitting by electrification which serves as the light source device according to the present invention shown in  FIG. 10( c )  and light from the LED light source.  FIG. 12  is a view showing an example of the spectrum of light from the halogen lamp of the first comparative example shown in  FIG. 10( a ) . 
     A solid line in a wavelength region of 380 nm to 780 nm in  FIG. 12  indicates the spectrum of light from the halogen lamp, and a broken line in a wavelength region of 300 nm to 380 nm in  FIG. 12  indicates an estimation curve calculated from a black body radiation model. 
     As shown in  FIG. 11 , it was determined that, in the light source device according to the present invention, the intensity (light amount) in a narrow wavelength band having a peak wavelength of 460 nm from the LED light source serving as the semiconductor light source was added to light by the halogen lamp in the state of heating and light emitting by electrification, and the intensity of the light by the halogen lamp was increased. 
     That is, according to the light source device of the present invention, it is possible to obtain the combined light in the wavelength band required for optical measurement with a simple configuration. 
     The inventors of the present application actually measured the spectrum of light at a color temperature of 3100 K of the halogen lamp serving as the first light source, the spectrum of light at a color temperature of 2850 K thereof, and the spectrum of combined light when the filament of the halogen lamp having the color temperature of the halogen lamp of 2850 K was irradiated with light having a wavelength of 340 nm from the LED light source serving as the second light source, and were able to obtain a measurement result shown in  FIG. 13 . 
     As shown in  FIG. 13 , it was determined that, in the light source device according to the present invention, even in the case where the color temperature of the halogen lamp was set to a relatively low color temperature (the color temperature of 2850 K), by irradiating the first light source with the LED light (the wavelength of 340 nm) from the LED light source serving as the second light source, it was possible to make the light intensity of the combined light at the wavelength of 340 nm to be about the same level as that of the light intensity of the halogen lamp alone (the color temperature of 3100 K). Note that it is possible to easily control the light intensity of the combined light at the above wavelength by appropriately adjusting the intensity of light emitted from the LED light source serving as the second light source with the light source control part. 
     In addition, the inventors of the present application actually measured the spectrum of combined light from the light source device having the halogen lamp serving as the first light source, the LED which emitted light having a wavelength of 340 nm as the second light source, and the LED which emitted light having a wavelength of 460 nm, and were able to obtain a measurement result shown in  FIG. 14 . 
     That is, it was determined that, in the light source device according to the present invention, in the case where the filament of the halogen lamp serving as the first light source was irradiated with each of lights from the LED light sources having different wavelengths of light, the combined light from the surface of the filament of the first light source easily increased the light intensity at each wavelength mentioned above, as shown in  FIG. 14 . 
       FIG. 15  is an arrangement diagram (top view) showing an example of the optical device  100  having the light source device  10  according to the embodiment of the present invention in which surface reflection on the bulb  112  of the filament lamp serving as the first light source  11  does not cause stray light. 
     The optical device  100  shown in  FIG. 15  is configured such that the filament  111  of the first light source  11  is irradiated with light emitted from the semiconductor light source serving as the second light source  12 , the sample  91  serving as the irradiated object is irradiated with combined light of light diffused and reflected on the filament  111  and light by heating and light emitting of the filament  111  via a measuring optical system  2120  (a lens or the like), and light having passed through the sample  91  enters a narrow hole (aperture  220   a ) of the detecting device  220  via a measuring optical system  2140  (a lens or the like). 
       FIG. 16  is a partially enlarged view of the filament  111  and, as shown in  FIG. 16 , an irradiation range AR 12  (region) by LED light from the second light source in the filament  111  of the filament lamp is set to be larger than an effective utilization range AR 220  (region) utilized in optical measurement by the optical measuring part (detecting device  220 ). With this, accuracy is not required of optical adjustment of LED light irradiation to the filament  111 , and the optical adjustment thereof can be performed easily. 
     In addition, in the detecting device  220 , light from the effective utilization range AR 220  of the filament  111  passes through the sample  91  and is used in optical measurement, but a region outside the effective utilization range AR 220  scarcely contributes to the optical measurement. Therefore, an excessively large irradiation range AR 12  is useless for the optical measurement, and hence the second light source  12  is configured to irradiate the same range as or slightly wider than the effective utilization range AR 220  (irradiation range AR 12 ) on the surface of the filament  111  with light. For example, in consideration of a reduction in light amount by an increase in irradiation range and a minute displacement or error of the second light source  12 , it is preferable to irradiate the irradiation range AR 12  of which vertical and horizontal sides are 1.4 times or less as long as those of the effective utilization range AR 220  with light. Specifically, the effective utilization range AR 220  which is a 1-mm square is irradiated by using a 1.4-mm square (irradiation range AR 12 ). Note that, in the above specific example, the size of the irradiation range AR 12  is set based on 1.4 times, but the size thereof may be appropriately set according to a device configuration or the like. 
     In addition, as shown in  FIG. 15 , the second light source  12  is preferably arranged such that part of light emitted from the second light source  12  is reflected on the surface of the bulb  112  of the filament lamp serving as the first light source  11 , but does not enter the measuring optical system  2120 . 
     For example, as in a comparative example shown in  FIG. 17 , if part of light emitted from the second light source  12  is reflected on the surface of the bulb  112  and enters the measuring optical system  2120 , there are cases where the light enters the detecting device  220  as stray light and measurement accuracy is reduced. 
     That is, as shown in, e.g.,  FIG. 15 , the optical device according to the present invention is configured such that the reflection on the bulb surface does not cause stray light, and hence it is possible to perform optical measurement with high accuracy. 
       FIG. 18  is a view showing an example of the optical device having the light source device according to the embodiment of the present invention and, specifically, as compared with the example shown in  FIG. 15 , the angle of the filament  111  and the angle of the surface of the bulb  112  are adjusted and stray light is thereby prevented. 
     Specifically, in the example shown in  FIG. 18 , as compared with the device in  FIG. 15 , the filament  111  and the bulb  112  are arranged such that the angle of the surface of the filament  111  with respect to the optical axis LA passing through the sample  91  serving as a measured object is unchanged, and the angle of the surface of the bulb  112  is increased. The first light source  11  shown in  FIG. 18  can be implemented by, for example, using the filament lamp in which the filament  111  in the bulb  112  is arranged obliquely to the longer axis of the hollow bulb  112  in a substantially cylindrical shape. 
     Next, a description will be given of a specific example of the filament lamp serving as the first light source  11  of the light source device. 
       FIG. 19( a )  is a view showing an example of the filament lamp having a flat coil filament, and  FIG. 19( b )  is a view showing an example of the filament lamp having a double-ended flat coil. 
     In addition,  FIG. 19( c )  is a view showing an example of the light source device including the filament lamp shown in  FIG. 19( a ) . 
     As shown in  FIG. 19( a )  to  FIG. 19( c ) , in the filament lamp serving as the first light source  11 , the filament  111  may be a flat coil. This flat coil filament  111  has a flat surface  111   f  having a substantially rectangular enveloping surface. The filament  111  is preferably arranged such that light from the second light source  12  is reflected on the flat surface  111   f  of the flat coil filament  111  and enters the measuring optical system  2120  (a lens or the like). That is, the filament  111  is preferably arranged such that the intensity of the light from the second light source  12  which is reflected on the flat surface  111   f  of the filament  111  and enters the measuring optical system  2120  (a lens or the like) is maximized. That is, specifically, the reflection is assumed to be direct reflection, and the angle of the flat surface  111   f  of the filament  111  is set. 
       FIG. 20( a )  is a view showing an example of the filament lamp serving as the first light source  11  which has a round coil filament  111 .  FIG. 20( b )  is a view showing an example of the filament lamp having a double-ended round coil as the filament  111 .  FIG. 20( c )  is a view showing an example of the light source device including the filament lamp shown in  FIG. 20( a ) . 
     As shown in  FIGS. 20( a ) to 20( c ) , in the filament lamp serving as the first light source  11 , the filament  111  may be a round coil. 
       FIG. 21  is a top view showing an example of the optical device  100  including the light source device  10  according to an embodiment of the present invention.  FIG. 22  is a side view of the optical device  100  including the light source device  10  shown in  FIG. 21 . 
     The light source device  10  shown in each of  FIGS. 21 and 22  has LED light sources serving as second light sources  12  ( 12   a,    12   b ) arranged to be spaced apart from each other by a predetermined distance in a vertical direction. The filament  111  of the filament lamp serving as the first light source  11  is irradiated with lights having different wavelengths emitted from the second light sources  12   a  and  12   b  via condensing lenses  13  ( 13   a,    13   b ) serving as the condensing optical systems. Combined light of light by heating and light emitting of the filament  111  and light by diffuse reflection of lights from the second light sources  12   a  and  12   b  enters, from the first light source  11 , the irradiated object (sample) and the optical measuring part (detecting device  220 ) via the measuring optical system  2120  (a lens or the like). 
     The second light sources  12  are not limited to the above-described embodiment and, for example, a plurality of semiconductor light sources may also be arranged along the vertical direction. 
     First Light Source is a Semiconductor Light Source Which Emits White Light, and Second Light Source is a Semiconductor Light Source Which Emits Narrowband Light 
     Next, a description will be given of a light source device  10 C of the optical device according to an embodiment of the present invention. 
     In the present embodiment, as shown in  FIG. 23 , a white LED serving as the first light source  11  ( 11 W) which is turned on is irradiated with narrowband light from a UV wavelength LED or the like serving as the second light source  12 , and combined light of light reflected on the first light source  11 W and light by light emission of the first light source  11 W itself which is turned on is emitted to the irradiated object (not shown) and the optical measuring part (detecting device  220 ) via the measuring optical system  2120  (a lens or the like). 
     That is, a light emitting surface of the white LED which is turned on is irradiated with LED light having a UV wavelength, and combined light in which UV scattered light is added to white light is emitted from the first light source  11 W to the irradiated object. 
       FIG. 24  is a view for explaining synthetic light of the light source device  10 C shown in  FIG. 23 . 
     As shown in  FIG. 24 , the white LED serving as the first light source  11 W of the light source device  10 C has, e.g., a blue LED  115  which emits blue light, and a light transmitting sealing member  116  including a plurality of phosphor particles  117  is provided on a light emitting surface side (light emission surface side) of the blue LED  115 . 
     The sealing member  116  is constituted of a light transmitting resin material such as a polymer resin. 
     As the phosphor particle  117 , it is possible to use a yellow phosphor, the yellow phosphor and a red phosphor, and a green phosphor and the red phosphor. 
     The phosphor particle  117  has a substantially spherical shape having an average particle diameter of about 10 μm. Air (refractive index is about 1), the sealing member  116  (refractive index is 1.3 to 1.5), and the phosphor particle  117  have different refractive indices, and a specific amount of light is reflected at their interfaces according to the refractive indices. Depending on an angle of incidence, total reflection occurs at the interface. 
     In the first light source  11 W, when it is turned on, the phosphor particles  117  are irradiated with blue light emitted from the blue LED  115 , the phosphor particles  117  are excited to emit light having a predetermined wavelength such as yellow, red, or green light, and white light is emitted from the first light source  11 W. 
     In addition, the first light source  11 W is irradiated with light from the second light source  12  directly or via the condensing optical system (the condensing lens  13  or the like), and the light from the second light source  12  is diffused and reflected by the phosphor particles  117 . 
     That is, from the first light source  11 W, combined light of light from the second light source  12  which is diffused and reflected by the phosphor particles  117 , light emitted from the blue LED  115 , and light excited by the phosphor particles  117  is emitted. 
     Note that the first light source  11 W may use an LED light source having a wavelength shorter than that of blue instead of the blue LED  115 . 
     In the embodiment described above, while the sealing member  116  includes the plurality of phosphor particles  117 , the present invention is not limited thereto and, for example, the phosphor particles  117  may also be directly applied to the light emitting surface of the blue LED. 
     The inventors of the present application fabricated the light source device having the white LED serving as the first light source  11 W and the UV wavelength LED serving as the second light source  12  which emitted light having a wavelength of 340 nm of the UV wavelength LED, and performed spectrum analysis by receiving combined light emitted from the above light source device with a light receiving device. 
       FIG. 25  is a view showing a measurement result of the combined light from the light source device shown in  FIG. 23 . In  FIG. 25 , the horizontal axis indicates the wavelength, and the vertical axis indicates spectral irradiance. 
     In the combined light, as compared with the spectrum of the white LED alone, the intensity of light is increased in the vicinity of a wavelength of 340 nm. That is, it was possible to observe the combined light of light having the wavelength of 340 nm from the second light source  12  and light of the white LED alone. 
     Thus, as described above, the light source device  10  according to the embodiment of the present invention has the first light source  11  (the filament lamp or the semiconductor light source), and the second light source  12  (the semiconductor light source) capable of irradiating the first light source  11  with light having a wavelength band narrower than the wavelength band of light by the first light source  11 , and the first light source  11  is configured to emit combined light of light from the first light source  11  and light from the second light source  12  which is diffused and reflected on the surface of the first light source  11  to the irradiated object. 
     In addition, the first light source  11  of the light source device is arranged on the optical axis (LA) which passes through the irradiated object. 
     That is, it is possible to provide the light source device capable of emitting combined light of light from the first light source  11  and narrowband light from the second light source  12  to the irradiated object with a simple structure without needing to perform complicated optical axis adjustment. 
     In other words, it is possible to provide the light source device capable of handling the combined light of the light from the first light source and the narrowband light from the second light source as if the combined light were single light from the first light source with the simple structure of which accuracy is not required. 
     In addition, it is possible to provide the optical device including the light source device. 
     In addition, the light source device  10  according to the embodiment of the present invention has the first light source  11  (the filament lamp such as the halogen lamp or the incandescent lamp) which includes the filament  111  capable of heating and light emitting (capable of high temperature light emitting) by electrification, and the second light source  12  (the semiconductor light source such as the LED element, the LD element, or the organic EL element) capable of irradiating the filament  111  of the first light source  11  with light having a wavelength in a band narrower than that of the wavelength of light by heating and light emitting of the first light source. The first light source  11  is configured to emit, at least from the filament  111 , combined light of light from the filament  111  in the state of heating and light emitting (high temperature light emitting state) and light from the second light source  12  which is diffused and reflected on the surface of the filament  111 . 
     The spectrum of the filament lamp is determined by the temperature of the filament  111  according to light emission principles of black body radiation. For example, even in the case where the current value of a current passed through the filament  111  is reduced to be lower than a normal specified value (or a maximum specified value) and, with regard to light from the filament  111  in the state of heating and light emitting by electrification of the first light source  11 , the intensity of light in a desired wavelength region is low (the light amount is small), in the light source device  10  according to the present invention, light in the desired wavelength region emitted from the second light source  12  is reflected on the surface of the filament in the state of heating and light emitting, and combined light of the reflection light and light by high temperature light emitting of the filament  111  can be emitted from the filament  111 , and hence it is possible to provide the light source device  10  capable of emitting light having an associated wave in which light by heating and light emitting of the electrified filament of the first light source  11  is supplemented with the intensity of light in the desired wavelength region by the second light source  12  with a simple configuration. 
     In addition, in the light source device  10  according to the present invention, the filament  111  of the first light source  11  is irradiated with light emitted from the second light source  12 , and combined light of light reflected on the filament  111  and light from the filament  111  in the state of heating and light emitting by electrification is emitted from the filament  111 , and hence, as compared with the light source device (comparative example) which combines LED light and light from the filament with, e.g., a mirror or a dichroic filter which reflects only the LED light, it is not necessary to provide a complicated structure for optical alignment or the like, it is not necessary to perform adjustment such as optical axis alignment, and it is possible to emit the combined light from the filament  111  with a simple configuration. 
     That is, in the light source device  10  according to the present invention, a light emitting position is a single position, i.e., the combined light of emitted light and reflection light is emitted at the position of the filament  111 , and hence a problem associated with, e.g., optical axis displacement caused by a plurality of light sources does not occur. 
     In addition, for example, as a comparative example, in a device which includes a plurality of light sources, combines lights having different wavelengths with a dichroic filter or the like, and emits the combined light, replacement is performed for each wavelength band, and hence there is a possibility that a reduction in intensity may occur in a wavelength region in the vicinity of an interface of lights having different wavelengths (due to the filter). 
     On the other hand, in the light source device  10  according to the present invention, as described above, by irradiating the filament  111  of the first light source  11  with the light from the second light source  12  and causing the light from the second light source  12  to be reflected, the combined light of the reflection light and the light by high temperature light emitting from the first light source  11  is emitted, and hence the intensity of the wavelength region of the combined light is obtained by simple addition of the intensity of the wavelength region of the reflection light and the intensity of the wavelength region of the light from the filament in the high temperature light emission, and, as a result, the reduction in intensity in the above comparative example does not occur. 
     In addition, in the case where the filament lamp such as the halogen lamp or the incandescent lamp is used as the first light source  11 , when the filament temperature is reduced in order to increase the life of the filament lamp, an intensity particularly in a short wavelength band is reduced. The light source device  10  according to the embodiment of the present invention has the above-described second light source  12 , and hence it is possible to compensate the low intensity in the wavelength band. 
     That is, it is possible to meet optical requirements and implement the light source device  10  having a long life with a simple configuration. 
     In addition, the light source device  10  according to the embodiment of the present invention has the condensing optical system (the condensing lens  13  or the reflecting part  14  (mirror)) which is arranged between the filament  111  of the first light source  11  and the second light source  12 , and condenses light emitted from the second light source  12  on whole or a part of the filament  111 . 
     That is, with a simple configuration, it is possible to reliably irradiate the filament  111  with the light emitted from the second light source  12 , and it is possible to obtain desired combined light. 
     Further, the second light source  12  of the light source device  10  according to the embodiment of the present invention is the semiconductor light source capable of emitting light in a desired wavelength region such as the LED light source, the LD light source, or the organic EL light source, and hence it is possible to manufacture the light source device  10  having a simple configuration inexpensively with the filament lamp serving as the first light source  11  and the semiconductor light source serving as the second light source  12 . 
     In addition, in the light source device according to the embodiment of the present invention, the first light source  11  is the semiconductor light source (the semiconductor light source such as the LED light source, the LD light source, or the organic EL light source) which emits white light, and the second light source  12  is the semiconductor light source capable of irradiating the first light source  11  with light having a wavelength band narrower than a wavelength band of light by the first light source  11 , whereby it is possible to manufacture the light source device capable of emitting the combined light in a desired wavelength band with a simple configuration inexpensively. 
     Further, the second light source  12  of the light source device  10  according to the embodiment of the present invention may include a plurality of semiconductor light sources capable of emitting lights having different peak wavelengths or different center wavelengths. 
     That is, the second light source  12  can emit desired combined light from the filament  111  of the first light source  11  by irradiating the filament  111  with light emitted from one or a plurality of semiconductor light sources which emit lights having peak wavelengths or center wavelengths required for, e.g., optical measurement. 
     The optical device  100  according to the embodiment of the present invention has the light source device  10 , and the optical measuring part (detecting device  220 ) which performs optical measurement of the irradiated object by using combined light from the light source device  10 . 
     That is, by setting the intensity of the wavelength band of combined light emitted from the above light source device  10  to the intensity which is sufficient for the optical measurement by the optical measuring part, it is possible to provide the optical device  100  capable of performing the optical measurement with high accuracy with the optical measuring part (detecting device  220 ). 
     In addition, the first light source  11  is preferably arranged on the optical axis (LA) which passes through the irradiated object (measuring object) and the optical measuring part (detecting device  220 ). 
     Note that contribution to an increase in the temperature of the filament  111  obtained by irradiating the filament  111  with light emitted from the semiconductor light source serving as the second light source  12  is zero or very small. 
     Thus, the embodiments of the present invention have been described in detail with reference to the drawings, but the specific configuration is not limited to these embodiments, and design changes and the like made within the scope which does not depart from the gist of the present invention are included in the present invention. 
     In addition, with regard to the embodiments shown in the above individual drawings, the descriptions of the embodiments can be combined as long as there is no inconsistency or problem in the purpose and the configuration. 
     Further, the descriptions of the individual drawings can be embodiments which are independent of each other, and the embodiments of the present invention are not limited to one embodiment made up of a combination of the individual drawings. 
     Note that the life of the semiconductor light source serving as the second light source  12  can be reduced by high heat, and hence heat interrupting means which transmits light from the second light source, and interrupts or reduces heat from the first light source  11  such as, e.g., a light transmitting insulating member or a filter may be provided between the second light source  12  and the first light source  11 . In addition, as the heat interrupting means, a condensing optical system for condensing light from the semiconductor light source on the filament  111 , e.g., a condensing lens or a reflecting member may have an insulation function. 
     In addition, a light guiding member may be provided between the second light source  12  and the first light source  11 , and light emitted from the second light source  12  may be guided to the filament  111  of the first light source  11  by the light guiding member. This light guiding member may be a light guiding plate made of resin or the like, or an optical fiber. 
     Further, the light source device  10  according to the present invention may be configured such that light emitted from the second light source  12  and reflected on the bulb  112  is combined with combined light emitted from the above filament  111 , and the irradiated object is irradiated with the light combined with the combined light. 
     That is, it is possible to increase the intensity of the combined light with a simple configuration. 
     In addition, the light source device  10  according to the present invention may have irradiation region adjusting means capable of adjusting a region of the filament  111  irradiated with light emitted from the second light source  12  by reducing or enlarging the region thereof. The irradiation region adjusting means may be, e.g., one or a plurality of optical lens systems capable of adjusting focal length. 
     Further, the light source device according to the present invention may have a light detecting part which detects the intensity of combined light from the filament of the first light source  11  or the irradiation region, and the light source control part may adjust the irradiation region with the irradiation region adjusting means based on a detection signal from the light detecting part. That is, it is possible to optimally adjust the intensity of the predetermined wavelength region of the combined light. 
     In addition, the light source device  10  according to the present invention may have light transmitting insulating means between the first light source  11  and the second light source  12 . That is, it is possible to prevent thermal degradation of the semiconductor light source serving as the second light source  12  with the insulating means. The function of the insulating means may also be provided in the condensing lens  13  or the reflecting part  14 . 
     REFERENCE SIGNS LIST 
     
         
           10  Light source device 
           11  First light source (filament lamp, semiconductor light source) 
           12  Second light source (semiconductor light sources such as LED light source, LD light source, and organic EL light source) 
           13  Condensing lens (condensing optical system, irradiation region adjusting means) 
           14  Reflecting part 
           15  Light receiving part 
           16  Display input part (display part and input part) 
           18  Light source control part 
           91  Sample (irradiated object) 
           100  Optical device (optical measuring device and the like) 
           111  Filament 
           112  Bulb 
           112 Ra First light transmission part 
           112 Rb Second light transmission part 
           211  Filter 
           212  Lens 
           220  Detecting device (optical measuring part)