JP2005181614A - Light guide, multi-wavelength light source device, and analytical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide, a plural wavelength light source device, and an analytical device that can reduce the number of components and easily adjust positions of a plurality of light sources. <P>SOLUTION: The light guide 2 is equipped with a light source holding part 21, which positions and holds a plurality of LEDs 3 respectively; an incidence opening 24, on which lights emitted by the LEDs 3 are made individually incident; and an emission opening 25, which emits the respective lights made incident from the incidence opening 24 to a specified direction, wherein the light source holding part 21, incidence opening 24, and emission opening 25 are an integrated formation member, made of a transparent material. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a light guide that guides light from a plurality of light sources having different wavelengths, a multi-wavelength light source device, and an analyzer.

  In an optical measurement device that measures the characteristics of a measurement object using light, it is necessary to irradiate the measurement object with light of different wavelengths and to incorporate a multi-wavelength light source device that emits light of different wavelengths. Is done.

  For example, a spectrophotometer measures the light intensity value of transmitted light that has passed through a measurement object and the light intensity value of transmitted light that has passed through a solution of a reference concentration for light of a specific wavelength, and compares these values. Thus, the chemical component of the measurement object is analyzed by calculating the absorbance. In this case, since the wavelength of the absorbed light differs depending on the measurement object, light having a plurality of wavelengths is required.

  In addition, for example, a measurement apparatus for clinical examination that measures blood ammonia concentration, blood urea nitrogen concentration, glucose concentration, etc., measures the color concentration in the detection layer of a reagent pad colored by blood and changes thereof. The concentration is measured. In this case, since the wavelength of the light to be used differs depending on the measurement item, light having a plurality of wavelengths is required.

  As the multi-wavelength light source device incorporated in such an optical measuring device, the following three are conceivable. The first multi-wavelength light source device disperses the light from the light source with a variable-angle diffraction grating, adjusts the rotation angle of the diffraction grating, and irradiates the sample with light of a desired wavelength. In the second multi-wavelength light source device, a plurality of filters that transmit a specific wavelength are arranged on a disk, the light from the light source is transmitted through a filter having a desired wavelength by rotating the disk, and the transmitted light is transmitted. Irradiate the sample. The third multi-wavelength light source device has a plurality of light sources having different output wavelengths arranged at a desired angle with respect to the diffraction grating, and outputs the necessary monochromatic light from the exit slit by sequentially emitting the plurality of light sources, The sample is irradiated with the output light (see, for example, Patent Document 1).

  6 is a cross-sectional view showing a configuration of a conventional optical measurement apparatus, FIG. 7 is a view of the conventional optical measurement apparatus shown in FIG. 6 as viewed from below, and FIG. 8 is a multiwavelength shown in FIG. It is the figure which expanded the light source part and exit slit of a light source device.

  The conventional optical measurement apparatus 100 includes a multi-wavelength light source device 110, a lens 105, a diffraction grating 106, and an exit slit 107. The multi-wavelength light source device 110 includes a plurality of light emitting diodes (hereinafter abbreviated as “LEDs”) 102a, 102b, 102c, 102d, 102e, and 102f (hereinafter simply referred to as “LEDs 102”) that emit light of different wavelengths. A holding plate 103 for holding each LED and a mounting member 104 for attaching each LED 102 to the base plate 101 are provided. A mask member 108 having an entrance slit is disposed between the holding plate 103 and the mounting member 104.

Light from the LEDs 102 is regulated by the entrance slit of the mask member 108 provided in each LED 102 and enters the diffraction grating 106 through the lens 105. The light dispersed by the diffraction grating 106 is collected by the lens 105 and enters the exit slit 107.
JP 2000-171299 A

  The first multi-wavelength light source device described above has a problem that a mechanism for driving the diffraction grating is required, and the size of the device increases. Further, the second multi-wavelength light source device has a problem that a mechanism for rotating the disk is required, which increases the size of the device, and it is necessary to prepare a plurality of filters corresponding to each wavelength. Have the problem of cost.

  In the third multiwavelength light source device, as shown in FIG. 8, a holding plate 103 for holding the light emitting diode 102 and a mask member 108 for regulating light from the light emitting diode 102 are required. Further, it is difficult to make the adjacent light emitting diodes 102 larger than the size of the light emitting diodes 102 themselves. When the light emitting diodes 102 are closer to the size of the light emitting diodes 102 themselves, as shown in FIG. This leads to an increase in the number of parts. Further, as shown in FIG. 7, each light emitting diode 102 is fixed in a different position and fixing direction. Therefore, electrical connection is performed by soldering a lead wire to a terminal of each light emitting diode 102. It connects to the control circuit board. Therefore, the electrical connection of each light emitting diode 102 becomes complicated and there is a risk of disconnection.

  The present invention has been made to solve the above problems, and can reduce the number of components and can easily adjust the positions of a plurality of light sources, a multi-wavelength light source device, and an analysis device. Is intended to provide.

  A light guide according to one configuration of the present invention determines a position of each of a plurality of light sources and holds a light source, an incident port for individually incident light emitted from each light source, and an incident from the incident port The light source holding portion, the incident port, and the emission port are integrally formed members made of a transparent material.

  According to this configuration, the position of each of the plurality of light sources is determined and held, the incident port where the light emitted from each light source is individually incident, and the light incident from the incident port are identified. The emission port that emits light in the direction is an integrally formed member made of a transparent material. Therefore, since a plurality of light sources are held by one component, the number of components can be reduced, the positional relationship of the emission ports can be fixed for each light source, and the positions of the plurality of light sources can be easily adjusted. Can do.

  In the above light guide, the light source is a light emitting diode, the light source holding part is substantially the same as the outer shape of the light emitting diode, and there is a gap between the light emitting diode and the light source holding part. It is preferable.

  According to this configuration, the light source is a light emitting diode, the light source holding part is substantially the same shape as the light emitting diode, and a gap is formed between the light emitting diode and the light source holding part. When fixing the light source to the light source holding part, the position of the light emitting diode can be easily adjusted by moving the light emitting diode within the gap.

  In the above light guide, the exit port is disposed at a position conjugate to the exit slit that exits through another optical system, and the shape of the exit port is relative to the shape of the exit slit. It is preferably formed in a conjugated shape.

  According to this configuration, the exit port is disposed at a position that is conjugate to the exit slit that exits through another optical system, and the exit port has a shape that is conjugate to the exit slit shape. Since it is formed, all the light emitted from the exit can be made incident on the exit slit, and the illumination efficiency can be increased.

  In the light guide, it is preferable that the entrance has a lens that forms an image of the light source on the exit.

  According to this configuration, since the entrance has the lens that forms an image of the light source on the exit, the light from the light source can be efficiently emitted from the exit.

  In the light guide, it is preferable that the exit port has a surface formed with a predetermined shape and / or angle for guiding the emitted light beam to another optical system.

  According to this configuration, since the exit port is formed with a predetermined shape and angle for guiding the emitted light beam to another optical system, regardless of the output wavelength of the adjacent light source, the surface of the exit port has By changing the shape and angle, the light source can be arranged close to the size of the light source itself, and there is no need to reflect light from the light source as in the conventional case, and the number of parts can be reduced.

  In the light guide, a reflection surface that changes an angle between an incident optical axis of light incident from the incident port and an output optical axis of light emitted from the output port is formed between the incident port and the output port. In addition, it is preferable that the reflection surface has an angle at which incident light is totally reflected and emitted from the emission port.

  According to this configuration, the angle between the incident optical axis of the light incident from the incident port and the outgoing optical axis of the light output from the output port is changed by the reflection surface further provided between the incident port and the output port. The reflecting surface has an angle at which incident light is totally reflected and emitted from the exit, so that a plurality of light sources can be arranged on the same plane, and the connection between each light source and the control circuit board can be established. It can be done easily.

  In the light guide described above, it is preferable to provide a gap that blocks the light flux from an adjacent light source before the light from the light source reaches the exit from the entrance.

  According to this configuration, since the gap that blocks the light flux from the adjacent light source is provided before the light from the light source reaches the exit port, the stray light of the light from the adjacent light source is reduced. Can be suppressed.

  A multi-wavelength light source device according to another configuration of the present invention includes a plurality of light sources that emit light of different wavelengths, and a light guide that individually guides light from the plurality of light sources, and the light guide includes a plurality of light guides. A light source holding unit that determines and holds each position of the light source, an incident port that individually enters light emitted from each light source, and an exit port that emits each light incident from the incident port in a specific direction, The light source holding part, the entrance and the exit are integrally formed members made of a transparent material.

  According to this configuration, light having different wavelengths is emitted by the plurality of light sources, and light from the plurality of light sources is individually guided by the light guide. The light guide determines the position of each of the plurality of light sources and holds the light source, the incident port where the light emitted from each light source is individually incident, and the light incident from the incident port. The emission port that emits light in the direction is an integrally formed member made of a transparent material. Therefore, since a plurality of light sources are held by one component, the number of components can be reduced, the positional relationship of the emission ports can be fixed for each light source, and the positions of the plurality of light sources can be easily adjusted. Can do.

  An analyzer according to still another configuration of the present invention includes a multi-wavelength light source device including a plurality of light sources that emit light of different wavelengths, and a light guide that individually guides light from the plurality of light sources, and the multi-wavelength A dispersion unit that disperses the light emitted from the light source device; an optical system that irradiates the sample to be measured with the light dispersed by the dispersion unit; a light receiving unit that receives the light transmitted through the sample; An analysis unit for analyzing the sample based on light received by the light receiving unit, the light guide determining and holding each position of a plurality of light sources, and emitting light for each of the light sources The light source holding unit, the incident port, and the emission port are made of a transparent material. The light source holding unit, the incident port, and the emission port are provided with an incident port for individually entering light and an emission port for emitting each light incident from the incident port in a specific direction. A body forming member.

  According to this configuration, light having different wavelengths is emitted by the plurality of light sources, light from the plurality of light sources is individually guided by the light guide, and light emitted from the light guide is dispersed by the dispersion unit. The light dispersed by the optical system is applied to the sample to be measured, the light transmitted through the sample is received by the light receiving unit, and the sample is analyzed by the analyzing unit based on the received light. . The light guide determines the position of each of the plurality of light sources and holds the light source, the incident port where the light emitted from each light source is individually incident, and the light incident from the incident port. The emission port that emits light in the direction is an integrally formed member made of a transparent material. Therefore, since a plurality of light sources are held by one component, the number of components can be reduced, the positional relationship of the emission ports can be fixed for each light source, and the positions of the plurality of light sources can be easily adjusted. Can do.

  According to the first aspect of the present invention, since a plurality of light sources are held by one component, the number of components can be reduced, and the positional relationship of the emission ports can be fixed for each light source. It is possible to easily adjust the position of the light source.

  According to the second aspect of the present invention, when the light emitting diode is fixed to the light source holding portion, the position of the light emitting diode can be easily adjusted by moving the light emitting diode within the gap.

  According to invention of Claim 3, all the light radiate | emitted from the output port can be entered into an output slit, and illumination efficiency can be raised.

  According to invention of Claim 4, the light from a light source can be efficiently radiate | emitted from an output port.

  According to the invention of claim 5, regardless of the output wavelength of the adjacent light source, by changing the angle of the plane of the exit port, it can be arranged close to the size of the light source itself, There is no need to reflect the light from the light source as in the prior art, and the number of components can be reduced.

  According to the invention described in claim 6, a plurality of light sources can be arranged on the same plane, and the connection between each light source and the control circuit board can be easily performed.

  According to invention of Claim 7, the stray light of the light from an adjacent light source can be suppressed.

  According to the invention described in claim 8, since the plurality of light sources are held by one component, the number of components can be reduced, and the positional relationship of the emission ports can be fixed for each light source. It is possible to easily adjust the position of the light source.

  According to the ninth aspect of the present invention, since a plurality of light sources are held by one component, the number of components can be reduced, and the positional relationship of the emission ports can be fixed for each light source. It is possible to easily adjust the position of the light source.

  Embodiments according to the present invention will be described below with reference to the drawings. In addition, about the same structure in each figure, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

(First embodiment)
FIG. 1 is a side sectional view showing an analyzer according to the first embodiment of the present invention, and FIG. 2 is a view of the analyzer shown in FIG. 1 as viewed from below.

  As shown in FIG. 1, the analysis device 10 includes a multi-wavelength light source device 11, a collimator / condensing lens 4, a diffraction grating 5, an exit slit 6, a relay lens 12, a reflection mirror 13, a cell disk 14, a light receiving sensor 15, and an analysis. A portion 16 is provided.

  A multi-wavelength light source device 11 that irradiates a sample to be measured with a plurality of measurement lights having different wavelengths includes a light guide 2 and a plurality of light sources 3.

  The light guide 2 includes a plurality of light source holding units 21, a plurality of light guide units 22, and a fixing unit 23. The light source holding unit 21 determines and holds the position of each of the plurality of light sources 3. Each light guide unit 22 includes an entrance 24, an exit 25, and a reflection surface 26. The incident port 24 makes the light emitted for each light source 3 individually enter. The exit 25 emits each light incident from the entrance 24 in a specific direction. The fixing unit 23 fixes the light guide 2 to the base plate 1 on the upper surface of the analyzer 10. The light source holding part 21, the light guide part 22, and the fixing part 23 are integrally formed members made of a transparent material such as acrylic, for example. The reflecting surface 26 is provided between the entrance 24 and the exit 25 and changes the angle between the incident optical axis of the light incident from the entrance 24 and the outgoing optical axis of the light emitted from the exit 25.

  The exit port 25 is a rectangular (including square) surface for suppressing the diffusion of light in a specific direction with respect to the light emitted from the light source 3 and obtaining a desired wavelength purity. The suppression direction is perpendicular to the groove direction of the diffraction grating 5 on which the light that has passed through the emission port 25 enters. The width of the emission port 25 is determined according to the wavelength so that the light passing through the emission port 25 has a desired half-value width.

  Each light source 3 is arranged on a substantially circular arc in the dispersion direction in the diffraction grating 5 and emits light having an emission wavelength intensity distribution including a wavelength band necessary for measurement. The light source 3 is, for example, a halogen lamp, a light emitting diode (hereinafter abbreviated as “LED”), a semiconductor laser, or the like, an optical fiber that guides light emitted from these, an optical path rod, or the like. In the present embodiment, LEDs that are superior in terms of size, heat generation, lifetime, and cost are used. In the light source 3, the emission wavelength intensity distribution of each light source and the number of light sources are determined in accordance with the number of wavelengths of emitted light required from the specifications of the analyzer 10. In the present embodiment, for example, six light sources 3 are prepared, and each emit light having a different wavelength.

  In addition, as shown in FIG. 2, in each light guide unit 22, the light flux from the adjacent LED 3 until the light from the light source (hereinafter referred to as LED) 3 reaches the exit port 25 from the entrance port 24. Since the space | gap which interrupts | blocks is provided, the stray light of the light from adjacent LED3 can be suppressed.

  The collimator / condenser lens 4 converts the light emitted from the exit port 25 into parallel light, guides it to the diffraction grating 5, and condenses the light (diffracted light) diffracted and reflected by the diffraction grating 5. The diffraction grating 5 is a spectroscopic element having a number of grooves parallel to the surface of the optical material at equal intervals in one direction, and spatially separates light. Instead of the collimator / condensing lens 4 and the diffraction grating 5, a concave diffraction grating having both a lens function for condensing light and a diffraction grating function for dispersing light may be used.

  The exit slit 6 is a rectangular slit for allowing only light having a specific dispersion width to pass through the light collected by the collimator / condenser lens 4 and obtaining a desired wavelength purity.

  The shape of the exit slit 6 is appropriately determined according to the purpose of use of the analyzer (the illumination shape of the measurement object, etc.), and for example, a circle or the like other than the rectangle can be adopted. Further, the exit port 25 is disposed at a conjugate position of the collimator / condenser lens 4 and the diffraction grating 5 with respect to the exit slit 6 that exits through the collimator / collector lens 4 and the diffraction grating 5. The shape is formed to be conjugate with the shape of the exit slit 6. That is, the shape of the exit port 25 is determined mainly according to the shape of the exit slit 6, and for example, a circular shape can be adopted. Thus, the exit port 25 is disposed at a position conjugate to the exit slit 6 that exits through the collimator / condenser lens 4 and the diffraction grating 5, and the shape of the exit port 25 is the shape of the exit slit 6. Therefore, all the light emitted from the emission port 25 can be made incident on the emission slit 6 and the illumination efficiency can be increased.

  The relay lens 12 guides the outgoing light emitted from the outgoing slit 6 to the sample surface to form an image. The cell disk 14 is, for example, a circular thin plate, and is configured to be detachable by being rotated by a rotor. On the concentric circle of the rotation axis of the cell disk 14, a plurality of dish portions 141 on which the sample is placed are provided. The dish part 141 is formed of a transparent member in order to transmit the measurement light. The reflection mirror 13 reflects the light that has passed through the relay lens 12 and irradiates the dish portion 141 of the cell disk 14 on which the sample is placed from below.

  A light receiving sensor 15 is provided above the cell disk 14 at a position facing the plate part 141 of the cell disk 14. The light receiving sensor 15 is composed of a plurality of photoelectric conversion elements arranged in the wavelength direction, receives the transmitted light transmitted through the sample placed on the dish portion 141, and outputs an electrical signal corresponding to the light intensity.

  The analysis unit 16 is configured by, for example, a CPU (Central Processing Unit) and the like, and analyzes components included in the sample based on the amount of light received by the light receiving sensor 15. For example, when the sample is blood, the analysis unit 16 measures the light intensity value of the transmitted light that has passed through the blood and the light intensity value of the transmitted light that has passed through the solution of the reference concentration for light of a specific wavelength. The chemical components of blood are analyzed by calculating the absorbance by comparing the values of. Further, for example, when measuring blood ammonia concentration, blood urea nitrogen concentration, glucose concentration, and the like, the analysis unit 16 determines the color concentration and its change in the detection layer of the reagent pad (dish unit 141) colored by blood. Analyze their concentrations by measuring.

  Here, the light guide 2 will be described in more detail. FIG. 3 is an enlarged cross-sectional view of the light guide and the LED in the first embodiment.

  A convex lens for condensing the light from the LED 3 is formed at the entrance 24. This convex lens has an optical performance for forming a light source image at the exit port 25. Thus, since the entrance 24 has a convex lens that forms an image of the LED 3 on the exit 25, the light from the LED 3 can be efficiently emitted from the exit 25.

  The reflecting surface 26 changes the angle between the incident optical axis of the light incident from the incident port 24 and the outgoing optical axis of the light emitted from the outgoing port 25. That is, the reflecting surface 26 totally reflects the light from the convex lens formed at the entrance port 24 at an angle of about 90 degrees and guides it to the exit port 25. Thus, the LED 3 is arranged on the same plane by changing the angle between the incident optical axis of the light incident from the incident port 24 and the outgoing optical axis of the light emitted from the output port 25 by the reflecting surface 26. The terminals of the plurality of LEDs 3 can be wired on the same planar circuit board. The exit 25 emits the light reflected by the reflecting surface 26 toward the collimator / condenser lens 4.

  FIG. 4 is a view for explaining the shape of the exit opening of the light guide in the first embodiment, and FIG. 4A is a view of the exit opening of the light guide as viewed from the diffraction grating side. 4 (b) is a cross-sectional view of the light guide.

  As shown in FIGS. 4A and 4B, the tip portion of the light guide 2 has a quadrangular pyramid shape, and the emission port 25 is formed in a rectangular shape when viewed from the diffraction grating side. Accordingly, the cross section of the tip portion is trapezoidal. The exit port 25 includes a plane formed with a predetermined shape and / or angle for guiding the emitted light beam to the collimator / condenser lens 4 and the diffraction grating 5 which are other optical systems. This plane serves as an entrance slit of the conventional multi-wavelength light source device. The emission direction is determined by the angle of the rectangular tip flat portion formed at the tip of the light guide 2. The angle of the plane portion is determined based on the refractive index of the material of the light guide 2 in consideration of refraction when the light from the LED 3 exits from the exit 25 into the air. In addition, by forming the plane of the exit port 25 at a predetermined angle, the angle of the plane of the exit port 25 is changed regardless of the output wavelength of the adjacent LED 3, thereby approaching the size of the LED 3 itself or more. Thus, there is no need to reflect light from the LED 3 as in the prior art, and the number of components can be reduced. Further, the tip of the light guide 2 is not limited to a rectangular plane. For example, it is possible to configure the lens to have a spherical or aspheric lens function. Further, by decentering the surface, it is possible to provide both a lens function and an optical path bending function.

  The light source holding part 21 is formed with a cylindrical hole that can accommodate a bullet-shaped LED 3 that is a light source. The light source holding part 21 has a larger hole than the LED 3 so that the light source holding part 21 can be adjusted when positioning the LED 3. The LED 3 is fixed by a photo-curing resin, a thermosetting resin, or the like after the position is adjusted so that light is emitted from the emission port 25 in a predetermined direction. Moreover, the shape of the light source holding part 21 is formed according to the shape of the light source, and is not limited to the cylindrical hole described above.

  The fixing portion 23 is formed with a hole 231 for adjustment and positioning when being fixed to the base plate 1, and further a screw hole 232 for fixing to the base plate 1 is formed (see FIG. 2). ). The light guide 2 and the base plate 1 are fixed with screws through screw holes 232 of the fixing portion 23.

  The plurality of LEDs 3 are arranged on substantially the same plane, and the terminal 31 of each LED 3 is connected to one circuit board 7 by solder 71. The circuit board 7 is fixed to the light guide 2 by a support bar 8. Here, the position adjustment of the LED 3 will be described. First, the light guide 2 and the circuit board 7 are fixed by the support rod 8, and the LED 3 is arranged in the space between the light guide 2 and the circuit board 7. The light source holding part 21 is substantially the same as the outer shape of the LED 3 except for the convex lens shape of the entrance 24, and a gap is formed between the LED 3 and the light source holding part 21. Can move back and forth, left and right, and up and down. The terminal 31 of the LED 3 is fixed and the LED 3 is held by a jig for passing current, and the direction of light emitted from the emission port 25 is detected while causing the LED 3 to emit light by flowing current, and the detected light direction is predetermined. The position of the LED 3 is adjusted by moving the LED 3 in the direction. When the position of the LED 3 is determined in this way, the LED 3 is fixed to the light source holding portion 21 with a photo-curing resin or a thermosetting resin, and the terminal 31 is fixed with the solder 71.

  Next, the operation of the analyzer 10 will be described. As shown in FIG. 3, first, the light from the LED 3 enters a convex lens-shaped entrance 24. The light that has entered the convex lens-shaped entrance 24 is totally reflected by the reflecting surface 26, the optical axis is changed by approximately 90 degrees, and the light is collected at the exit 25. The exit port 25 emits light according to the shape of the exit port 25. The light emitted from the emission port 25 enters the collimator / condenser lens 4. The light incident on the collimator / condenser lens 4 enters the diffraction grating 5 as parallel light. The diffraction grating 5 disperses incident light. The light dispersed by the diffraction grating 5 is incident again on the collimator / condenser lens 4 and is condensed on the exit slit 6 by the collimator / collector lens 4. The light that has passed through the exit slit 6 enters the reflection mirror 13 via the relay lens 12, is reflected by the reflection mirror 13, and forms an image on the dish portion 141 of the cell disk 14. The light receiving sensor 15 detects the transmitted light that has passed through the sample of the dish portion 141, and the analyzing unit 16 analyzes the chemical component contained in the sample based on the light detected by the light receiving sensor 15.

  In this way, light of different wavelengths is emitted by the plurality of LEDs 3, light from the plurality of LEDs 3 is individually guided by the light guide 2, and light emitted from the light guide 2 is dispersed by the diffraction grating 5. Then, the dispersed light is irradiated onto the sample to be measured by the relay lens 12 and the reflection mirror 13, the light transmitted through the sample is received by the light receiving sensor 15, and the light received by the analysis unit 16 is received. Based on the sample is analyzed. Then, the light guide 2 has a light source holding unit 21 in which the positions of the plurality of LEDs 3 are determined and held, an incident port 24 into which light emitted from each LED 3 is individually incident, and each incident from the incident port 24. The light emission port 25 that emits the light in a specific direction is an integrally formed member made of a transparent material. Therefore, since the plurality of LEDs 3 are held by one component, the number of components can be reduced, the positional relationship of the emission ports 25 can be fixed for each LED 3, and the position of the plurality of LEDs 3 can be easily adjusted. be able to.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the first embodiment described above, the optical axis of the light incident on the incident port 24 and the optical axis of the light emitted from the output port 25 have an angle of approximately 90 degrees. The present invention is not particularly limited to this, and the optical axis of the light incident on the incident port 24 and the optical axis of the light emitted from the output port 25 may be the same.

  FIG. 5 is a cross-sectional view showing an example of a light guide according to the second embodiment of the present invention. The light guide 2 ′ illustrated in FIG. 5 includes a plurality of light source holding units 21, a plurality of light guide units 22, and a fixing unit 23. Each light guide unit 22 includes an entrance 24 and an exit 25. The arrangement of the light guides 22 in plan view is the same as that in the first embodiment shown in FIG. 2, and the circuit board 7 is composed of a single flexible board. In addition, since the configuration of the light guide 2 ′ in the second embodiment and the configuration of the light guide 2 in the first embodiment are the same except for the presence or absence of the reflecting surface 26, description thereof is omitted.

  As in the first embodiment, in the light guide 2 ′ in the second embodiment, the light source holding unit 21, the entrance 24 and the exit 25 of the light guide unit 22, and the fixing unit 23 are made of a transparent material. It is integrally formed. As shown in FIG. 5, the light from the LED 3 is condensed on the exit port 25 by a convex lens formed at the entrance port 24, and light corresponding to the shape of the exit port 25 is emitted.

  In this case, it is not necessary to consider the reflection efficiency by the reflection surface 26 as in the first embodiment, and the optical design can be easily performed. Further, since the optical axis of the LED 3 is used as it is rather than bending the optical axis of the LED 3 by approximately 90 degrees, the dimension in the height direction of the device can be shortened.

  Next, a modification of the second embodiment will be described. The arrangement of the light guides 22 in the second embodiment is the same as that in the first embodiment shown in FIG. 2, but the circuit boards 7 are arranged by arranging the light guides 22 in parallel to each other. It can be modified to be composed of a single hard substrate.

  That is, with reference to FIG. 2, in the modification, unlike the case of FIG. 2, the light guide portions 22 are arranged in the direction of the arrows in the drawing and parallel to each other. Then, one circuit board (hard board) 7 is arranged in a direction to form a plane perpendicular to the figure along the broken line 7'-7 'in the figure, and the terminal 31 of each LED 3 is common to this. The circuit board 7 to be fixed is fixed with solder 71.

  In such a case, there are those in which the direction of the light guide unit 22 and the light projection direction are different, but the direction of light is desired by appropriately changing the angle of the surface on which the light emission port 25 is formed at the tip of the light guide unit 22. Can be projected.

  Further, in this case, there may be a difference in the distance between the entrance port 24 and the exit port 25 for each light guide unit 22. In this case, adjustment is made by changing the curvature of the convex lens-shaped portion of the entrance port 24. Can do.

  Furthermore, the distance between adjacent light guides must be extremely narrow, or the light path must be largely bent at the exit port 25, so that desirable performance cannot be obtained. In the case of a light guide part (for example, the uppermost light guide part indicated by symbol A in FIG. 2) that is difficult to arrange in parallel with the part, the light guide part alone is not parallel to the other light guide parts. And can be arranged in the desired direction. As for the light guide part, it becomes difficult to share the circuit board (hard substrate) with other light guide parts, but the other light guide parts share the circuit board, and a circuit is provided for each light guide part. It is much simpler to construct and assemble than to have a substrate.

It is side surface sectional drawing which shows the analyzer in the 1st Embodiment of this invention. It is the figure which looked at the analyzer shown in FIG. 1 from the downward direction. It is sectional drawing to which the light guide and LED in 1st Embodiment were expanded. It is a figure for demonstrating the shape of the exit of a light guide in 1st Embodiment. It is sectional drawing which shows an example of the light guide in the 2nd Embodiment of this invention. It is sectional drawing which shows the structure of the conventional optical measuring device. It is the figure which looked at the conventional optical measuring device shown in Drawing 6 from the lower part. It is the figure which expanded the light source part and exit slit of the multiwavelength light source device shown in FIG.

Explanation of symbols

1 Base plate 2 Light guide 3 Light source (light emitting diode)
DESCRIPTION OF SYMBOLS 4 Collimator and condensing lens 5 Diffraction grating 6 Output slit 7 Circuit board 10 Analyzer 11 Multiwavelength light source device 12 Relay lens 13 Reflection mirror 14 Cell disk 15 Light receiving sensor 16 Analyzer 21 Light source holder 22 Light guide 23 Fixing portion 24 Entrance 25 Exit 26 Reflection surface

Claims (9)

A light source holding unit that determines and holds the position of each of the plurality of light sources;
An entrance for individually entering light emitted from each light source;
An exit for emitting each light incident from the entrance in a specific direction;
The light guide, wherein the light source holding part, the entrance and the exit are integrally formed members made of a transparent material. The light source is a light emitting diode;
The light guide according to claim 1, wherein the light source holding part has substantially the same shape as an outer shape of the light emitting diode, and a gap is provided between the light emitting diode and the light source holding part. The exit is disposed at a position that is conjugate to the exit slit that exits through another optical system,
The light guide according to claim 1, wherein the shape of the exit port is formed in a shape that is conjugate to the shape of the exit slit.   The light guide according to claim 1, wherein the entrance has a lens that forms an image of the light source on the exit.   The light guide according to claim 1, wherein the exit port has a surface formed with a predetermined shape and / or angle for guiding the emitted light beam to another optical system. A reflection surface for changing the angle between the incident optical axis of the light incident from the incident port and the outgoing optical axis of the light emitted from the output port is further provided between the incident port and the output port;
The light guide according to claim 1, wherein the reflecting surface has an angle at which incident light is totally reflected and exits from the exit.   The light guide according to claim 1, wherein a gap for blocking a light beam from an adjacent light source is provided before the light from the light source reaches the exit from the entrance. A plurality of light sources that emit light of different wavelengths,
With a light guide that individually guides light from multiple light sources,
The light guide is
A light source holding unit that determines and holds the position of each of the plurality of light sources;
An entrance for individually entering light emitted from each light source;
An exit for emitting each light incident from the entrance in a specific direction;
The multi-wavelength light source device, wherein the light source holding part, the incident port, and the exit port are integrally formed members made of a transparent material. A multi-wavelength light source device including a plurality of light sources that emit light of different wavelengths, and a light guide that individually guides light from the plurality of light sources,
A dispersion unit for dispersing light emitted from the multi-wavelength light source device;
An optical system for irradiating the sample to be measured with the light dispersed by the dispersion unit;
A light receiving portion for receiving light transmitted through the sample;
An analysis unit for analyzing the sample based on the light received by the light receiving unit,
The light guide is
A light source holding unit that determines and holds the position of each of the plurality of light sources;
An entrance for individually entering light emitted from each light source;
An exit for emitting each light incident from the entrance in a specific direction;
The analyzer characterized in that the light source holding part, the entrance and the exit are integrally formed members made of a transparent material.

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