WO2016047222A1 - Light guide component and light source device - Google Patents

Abstract

The purpose of the present invention is to improve the focusing property of a light guide component. A light-focusing light guide device (8) comprises: a first reflecting surface (50) formed into a curved shape extending from an LED package (24) toward an incidence end surface (35) of a light guide (2) along an optical axis (K) to reflect the light from the LED package (24) and thereby focus the reflected light onto the incidence end surface (35); and an optical control element (60) housed at the end part of the first reflecting surface (50) near the incidence end surface (35). The optical control element (60) refracts the light directed and incident onto the reflecting surface at the end part near the incidence end surface (35) and emits the refracted light at an emission angle less than and equal to a prescribed angle.

Description

Light guide component and light source device

The present invention relates to a light guiding technique for guiding the light of a light source to a light receiver.

An endoscope widely used as a device for industrial use generally includes a light guide for guiding illumination light to an observation point, and a light source device for causing the illumination light to be incident on the light guide is known (for example, Patent Document 1 and Patent Document 2).
Also, in recent years, LEDs having a small light emitting point but a large amount of light per unit area have been put to practical use.

JP 2012-105715 A JP, 2011-200380, A

The light source device generally includes a condensing optical system that condenses the light of the light source on the incident surface of the light guide. However, the conventional condensing optical system has low condensing ability on the incident surface of the light guide. Thereby, the utilization efficiency of light emission of LED in a light guide became low, and light emission of LED was not efficiently used as illumination light of an endoscope.

This invention is made in view of the situation mentioned above, and an object of this invention is to provide the light guide component which can improve condensing property, and a light source device.

This specification includes the entire contents of Japanese Patent Application No. 2014-193559 filed on Sep. 24, 2014.
In order to achieve the above object, the present invention has a curved surface shape extending along an optical axis from a light source to a light receiving point, and a reflecting surface that condenses the light of the light source to the light receiving point by reflection; A light control element housed at an end of the reflection surface on the side of the light source, the light control element refracts incident light toward the reflection surface at the end of the light receiving point side, There is provided a light guide component characterized by emitting at an emission angle equal to or less than an angle.

Still further, according to the present invention, in the light guiding component, a first lens body which refracts and focuses light directed to a reflecting surface at an end of the light receiving point side, and the first lens body And a second lens body that makes the outgoing angle of the light incident from the second side be equal to or less than a predetermined angle.

Further, the present invention is characterized in that, in the light guide component, the second lens body having a refractive index larger than that of the first lens body is accommodated in the first lens body.

Further, according to the present invention, in the light guiding component, the reflecting surface has a light emitting surface in which a plurality of light emitting points are gathered. The light emitting point of the light source is a first focus, and the light receiving point is a second focus. It is characterized in that each of the elliptical reflecting surfaces defined in each is overlapped.

In the invention, in the light guiding component, the reflecting surface has a first reflecting surface on the side of the light source on an elliptical reflecting surface having the light source as a first focus and the light receiving point as a second focus. The first reflecting surface reflects the light of the light source to be incident on the light receiving point side of the elliptical reflecting surface, and the light of the light reflected on the light receiving point side of the elliptical reflecting surface due to the incident. It is characterized in that light whose incident angle to the light receiving point is equal to or less than a predetermined angle is incident on the side of the light receiving point of the elliptical reflection surface.

Further, the present invention provides a light source device comprising the light guide component described in any of the above, wherein the light of the light source is incident on the incident end face of the light guide disposed at the light receiving point.

Further, in the present invention, the light guiding component includes the reflecting surface and an optical path combining optical element that combines the optical paths of the reflecting surfaces, and the other reflecting surface is connected to one of the reflecting surfaces, The optical paths of the respective reflecting surfaces are combined by the optical path combining optical element and condensed at the common light receiving point, and two reflecting surfaces are provided with light sources different in wavelength band from each other. Do.

According to the present invention, since the light control element controls the emitted light, the light collecting property at the light receiving point is enhanced.

FIG. 1 is a perspective view showing the configuration of the front side of a light source device according to an embodiment of the present invention. FIG. 2 is a view showing an internal structure of the light source device. FIG. 3 is an explanatory view of an assembled structure of the light source device. FIG. 4 is an exploded perspective view of the built-in component unit. FIG. 5: is a figure which shows typically the structure of the reflective surface with which a condensing light guide is provided. FIG. 6 is an explanatory view of an elliptical reflection surface. FIG. 7 is a schematic view showing the configuration of the light emitting surface of the LED package. FIG. 8 is a cross-sectional view of a plane perpendicular to the central axis of the superimposed ellipsoid. FIG. 9 is a cross-sectional view of a plane including the central axis of the rotating body (first reflection surface). FIG. 10 is a diagram showing the illuminance distribution at the second focal point of the reflecting surface. FIG. 11 is a diagram showing the light distribution characteristic of the reflection surface. FIG. 12 is a cross-sectional view of a condensing light guide. FIG. 13 is an exploded view of the light control element. FIG. 14 is a view showing light distribution characteristics of a reflection surface in which the light control element is provided. FIG. 15 is a cross-sectional view of a condensing light guide according to a modification of the present invention. FIG. 16 is an exploded view of the light control element according to the modification. FIG. 17 is an explanatory view of a first reflection surface according to a modification of the present invention. FIG. 18 is a schematic view of a reflective surface according to a modification of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing the configuration on the front side of the light source device 1 according to the present embodiment, and FIG. 2 is a view showing the internal structure of the light source device 1. In FIG. 2, the upper surface of the light source device 1 is omitted to show the internal structure of the light source device 1.
The light source device 1 causes light to be incident on a light guide 2 (FIG. 2) included in an endoscope used for observation of the inside of a human body, and light incident on the light guide 2 is endoscope by the light guide 2 The light is guided to the observation point of (1) and irradiated as illumination light.

As shown in FIG. 1, the light source device 1 has a substantially rectangular parallelepiped shape, and a vent hole 4 and a mounting hole 5 are provided on the front surface 1A of the light source device 1. The guide 2 is mounted. Legs 6 are provided at four corners of the bottom surface 1B of the light source device 1. Further, as shown in FIG. 2, the rear face 1C of the light source device 1 is provided with an intake hole 11 for sucking in and introducing cooling air inside, and a connector 38 to which a wire such as a power supply line or control line is connected. ing.

The light source device 1 includes a case body 3, and as shown in FIG. 2, the case body 3 includes two light source units 7A and 7B, a condensing light guide 8, a holder unit 9, and a heat dissipating fan. 10 and is stored.
Specifically, in the case body 3, the mounting stage 12 is provided on the side of the front surface 3 </ b> A, and the holder unit 9 is assembled and mounted on the mounting stage 12. Further, in the case body 3, a frame plate 13 extending from the mounting stage 12 to the back surface 3C side is provided, and in the frame plate 13, the light source units 7A and 7B and the condensing light guide 8 are provided. , And the heat radiation fan 10 are assembled.

FIG. 3 is an explanatory view of an assembled structure of the light source device 1.
A unit insertion port 15 is provided on the back of the case body 3 and the built-in component unit 16 is inserted from the unit insertion port 15 and incorporated therein. The built-in component unit 16 is a unit body in which the light source units 7A and 7B, the condensing light guide 8 and the heat dissipating fan 10 are assembled in advance to the frame plate 13. A back panel 17 is assembled to the built-in component unit 16, and the back panel 17 closes the unit insertion opening 15 of the case body 3 to constitute the above-described back surface 1 </ b> C of the light source device 1.

FIG. 4 is an exploded perspective view of the built-in component unit 16.
Guide pieces 18, 18 are provided at both edges of the frame plate 13, and as shown in FIG. 3, guide grooves 19 for guiding the guide pieces 18, 18 are provided inside the case body 3. When the built-in component unit 16 is inserted, the guide pieces 18, 18 are guided along the guide groove 19 so that they are accurately positioned inside the case body 3.
Further, two positioning pins 20 are provided on the front end portion 13B of the frame plate 13, that is, on the contact surface with the mounting stage 12 to which the holder unit 9 is fixed. When the built-in component unit 16 is assembled to the case body 3 by the positioning pins 20, the holder unit 9 fixed in advance in the case body 3 and the condensing light guide 8 of the built-in component unit 16 And positional deviation is prevented. Specifically, when the built-in component unit 16 is inserted into the case body 3, the positioning pins 20 engage with the positioning holes (not shown) of the mounting stage 12 and the light guiding type light guide to the holder unit 9 Container 8 is accurately positioned.

Next, each part of the built-in component unit 16 will be described in detail.
Each of light source unit 7A and light source unit 7B is a unit which constitutes a light source of light source device 1, and light emission wavelengths differ. As shown in FIG. 4, the light source unit 7A includes an LED unit 21A that emits light in a first wavelength band Δλ1, and the light source unit 7B emits a light in a second wavelength band Δλ2 different from the first wavelength band Δλ1. It is equipped with 21B. The first wavelength band Δλ1 and the second wavelength band Δλ2 will be described later.

The LED unit 21A includes an LED package 24A that emits light in a first wavelength band Δλ1, and an LED substrate 23 on which the LED package 24A is mounted. Further, in the LED unit 21B, an LED package 24B that emits light in the second wavelength band Δλ2 is mounted on the LED substrate 23, as in the LED unit 21A.

The LED packages 24A and 24B include a plurality of LED chips 26 (FIG. 7), which are an example of light emitting elements, and a shell-shaped lens body 39 made of resin that covers all the LED chips 26. Each of the LED chips 26 has a square shape in plan view of approximately 1 mm square, and substantially the entire upper surface of each of the LED chips 26 is a light emitting surface 27 (FIG. 7). In the LED packages 24A and 24B, the LED chips 26 are disposed adjacent to each other, and the light emitting surfaces 27 of the adjacent LED chips 26 form one large light emitting surface 29 (FIG. 7). In other words, in the LED packages 24A and 24B, the light emitting surface 27 of each of the LED chips 26 corresponds to a light emitting point. Then, by combining these light emitting points, a light emitting surface 29 which is a light emitting point larger than the light emitting points of the individual LED chips 26 is configured.

Further, as shown in FIG. 4, the light source units 7A and 7B include a heat dissipation unit 22 that dissipates heat generated by the LED units 21A and 21B.
The heat dissipation unit 22 is a unit body formed of a high thermal conductivity material on which the LED substrates 23 of the LED units 21A and 21B are mounted, and includes a plurality of heat dissipation fins 25 integrally.

In the light source units 7A and 7B, the optical axes K of the respective LED packages 24A and 24B are substantially parallel to the upper surface 13A of the frame plate 13 and the optical axes K cross each other at 90 degrees. It is attached almost vertically to the.
In the light source device 1, the light source unit 7 </ b> A is disposed to face the back panel 17, and the suction type heat dissipating fan 10 is provided on the back panel 17. The heat dissipating fan 10 sucks the outside air from the air intake holes 11, and the outside air is blown to the heat dissipating units 22 of the light source units 7A and 7B to be air cooled and discharged to the outside from the vent holes 4 on the front surface 1A of the light source device 1.

The light source units 7A and 7B are controlled to be lit by, for example, an LED drive circuit (not shown) disposed on the back side of the frame plate 13 or the like. In this light source device 1, it is possible to simultaneously turn on two light source units 7A and 7B or to turn on only one of them.

The condensing light guide 8 is a light guiding component that combines the light from the light source units 7A and 7B as light sources and guides the light to the holder unit 9 while condensing the light by reflection, as shown in FIG. It has a substantially rectangular parallelepiped shape, and is fixed to the frame plate 13 by screwing four corners.
As shown in FIG. 4, this condensing type light guide 8 has a pair of plate members 30 and 31 joined vertically, and a reflective metal film is formed on the surface of the joined surfaces of the plate members 30 and 31. A deposited recess is formed. The plate members 30 and 31 are formed of, for example, a resin material using a mold or the like, and the shape of the recess is accurately formed. These recesses constitute a reflecting surface 40 having a light guiding function and a light collecting function by combining the two. A light control element 60 is provided in the reflecting surface 40. The details of the reflective surface 40 and the light control element 60 will be described later.

The condenser type light guide 8 is provided with light source side openings 32 and 33 for taking light into the reflection surface 40 corresponding to the respective arrangement positions of the light source units 7A and 7B, and light reception which is an emission opening on the front surface A side opening 34 is provided, and the holder unit 9 is connected to the light receiving side opening 34.
The lens bodies 39 of the LED packages 24A and 24B are inserted into the light source side openings 32 and 33, and light leakage from the light source side openings 32 and 33 is suppressed.

The holder unit 9 positions and holds the incident end of the light guide 2 with respect to the output end (a second focal point f2 described later) of the condensing light guide 8, as shown in FIG. It is fixed to the mounting stage 12 of the case body 3 in advance and assembled.

FIG. 5: is a figure which shows typically the structure of the reflective surface 40 with which the condensing light guide 8 is provided.
The reflective surface 40 is a condensing optical system that condenses the light emitted by the LED packages 24A and 24B of the light source units 7A and 7B on the incident end surface 35 of the light guide 2. The reflective surface 40 is shaped so as to surround everything from the LED packages 24A and 24B to the vicinity of (in front of) the incident end face 35 of the light guide 2.
Specifically, the reflective surface 40 is vertically connected to the side surface of the first reflective surface 50, which is a long thin cylindrical curved surface extending along the optical axis K to the vicinity of the incident end surface 35. And a second reflecting surface 51 which is a cylindrical curved surface. The LED package 24A is disposed at the end of the first reflection surface 50, and the LED package 24B is disposed at the end of the second reflection surface 51.

The first reflective surface 50 is a cylindrical condensing reflective surface having a central axis L1. In this example, the length along the central axis L1 is approximately 150 mm, and the maximum width in the direction perpendicular to the central axis L1 is The appearance of about 33.8 mm has a curved shape resembling a cigar type or an ellipsoid.
The first reflecting surface 50 is open at both ends on the central axis L1, and is formed as the light source side opening 32 and the light receiving side opening 34, respectively. In the light source side opening 32, the LED package 24A is disposed with the optical axis K aligned with the central axis L1, and the light of the LED package 24A is incident on the first reflection surface 50 from the light source side opening 32. In the light receiving side opening 34, the incident end face 35 of the light guide 2 is disposed at a position separated by a distance W, and on the incident end face 35, the light of the LED package 24A guided while being condensed by the first reflection surface 50. Is incident.
In addition, the distance W provided between the light receiving side opening 34 of the first reflection surface 50 and the incident end face 35 of the light guide 2 can be appropriately set. For example, the position of the light receiving side opening 34 of the first reflection surface 50 may be aligned with the position of the incident end face 35.

The second reflection surface 51 is a condensing reflection surface having a central axis L 2, and an end on the side not connected to the first reflection surface 50 is opened as the light source side opening 33. In the light source side opening 33, the LED package 24B is disposed with the optical axis K aligned with the central axis L2, and light is incident on the second reflection surface 51. The second reflective surface 51 is connected to the side surface of the first reflective surface 50 in a posture in which the central axis L2 perpendicularly intersects with the central axis L1 of the first reflective surface 50.

A dichroic mirror 55 is disposed on the central axis L1 of the first reflection surface 50 at an intersection point M with the central axis L2. The dichroic mirror 55 is an optical path combining optical element which is provided at an incident angle of 45 degrees with respect to each of the central axes L1 and L2 and combines the optical path of the second reflecting surface 51 with the optical path of the first reflecting surface 50. As shown in FIG. 4, the first reflection surface 50 is provided with a mirror insertion groove 43, and the edge of the dichroic mirror 55 is inserted into the mirror insertion groove 43.
Note that, instead of the dichroic mirror 55, another optical path combining optical element such as, for example, a prism or a half mirror can be used.

In the reflecting surface 40, by disposing the dichroic mirror 55 at the intersection point M, the second reflecting surface 51 can be regarded as geometrically optical equivalent (that is, the same structure) as the first reflecting surface 50 when viewed from the intersection point M. Configured as. Therefore, the light incident from the light source side opening 33 of the second reflecting surface 51 is guided while being condensed toward the light receiving side opening 34 of the second reflecting surface 51 in the same manner as the first reflecting surface 50, and a light guide The light is incident on the two incident end faces 35.

As described above, the light of the LED package 24A that emits the first wavelength band Δλ1 and the light of the LED package 24B that emits the second wavelength band Δλ2 are incident on the reflection surface 40. Therefore, either the light of the first wavelength band Δλ1, the light of the second wavelength band Δλ2, or the light of the combined wavelength band of the first and second wavelength bands Δλ1 and Δλ2 is received according to the blinking state of the both. It is incident on the side opening 34.

Here, since the second reflection surface 51 is geometrically equivalent to the first reflection surface 50, the light guiding function, the light collecting function, and the light path of the reflection surface 40 of the light collecting type light guide 8 are as follows. This will be described by the first reflecting surface 50 in FIG.
The first reflection surface 50 is a condensing reflection surface that condenses the light emitted from the light source side opening 32 to the light receiving side opening 34. Generally, it is an ellipse as a reflective optical system that condenses the light of the light emission point to the light reception point A reflective surface is known, and before describing the first reflective surface 50, this elliptical reflective surface will be outlined.

FIG. 6 is an explanatory view of the elliptical reflecting surface 70.
The elliptical reflective surface 70 is a reflective surface that has two focal points of a first focal point f1 and a second focal point f2 and focuses the light emitted from the first focal point f1 to the second focal point f2. Therefore, if the LED package 24A is disposed at the first focal point f1 of the elliptical reflection surface 70 and the incident end face 35 of the light guide 2 is disposed at the second focal point f2, ideally all the light of the LED package 24A is incident The light is collected on the end face 35.

However, as shown in FIG. 5, the light emitting surface 29 of the LED package 24A, which is a light source, is not so small as to be regarded as a point due to the optical design of the first reflecting surface 50. It has a size D1 greater than 27. Therefore, as shown in FIG. 6, the reflected light emitted from the light emitting surface 29 located at the first focal point f1 and reflected by the elliptical reflecting surface 70 toward the second focal point f2 has a size D1 of the light emitting surface 29. By advancing at a corresponding angle γ, a component deviating from the second focal point f2 is generated. If this component is present, a component which does not enter into the range of the aperture diameter D2 (FIG. 5) of the incident end surface 35 of the light guide 2 is generated, resulting in loss and the light utilization efficiency is lowered.

The decrease in utilization efficiency of light is as the numerical aperture NA of the light guide 2 decreases, as the aperture diameter D2 of the incident end surface 35 of the light guide 2 decreases, and as the size D1 of the light emitting surface 29 of the LED package 24A increases. It becomes remarkable.

In general, in the endoscope, as the numerical aperture NA of the light guide 2 is smaller, the directivity of the illumination light is enhanced, so that the light quantity can be collected and irradiated in a narrow range. In this light source device 1, the light guide 2 having a numerical aperture NA of 0.2 to 0.35 (maximum incident angle θmax = Arcsin (NA) = 11.5 ° to 20 °) and an aperture diameter D2 of about 4 mm is used. Both the numerical aperture NA and the aperture diameter D2 are smaller than in a general light guide. Furthermore, in the light source device 1, the size D1 of the light emitting surface 29 of the LED package 24A is approximately 2 to 3 mm, and the light utilization efficiency is significantly reduced unless any measures are taken.

Therefore, in the light collecting type light guide 8, the first reflection surface 50 and the second reflection surface 51 are not the elliptical reflection surface 70, but the light emission surface 29 which is the light emission point of the light source as follows. Even in the case where the size D1 has a size D1, the decrease in the light collecting property is suppressed.

FIG. 7 is a schematic view showing the configuration of the light emitting surface 29 of the LED package 24A.
As described above, the LED package 24A includes the LED chip 26 which is an example of a plurality of (four in the illustrated example) light emitting elements. Each LED chip 26 has a 1 mm square light emitting surface 27 substantially rectangular in plan view, and by arranging the light emitting surfaces 27 adjacent to each other in a grid shape, the appearance 1 of a size of 2 to 3 mm square 1 One light emitting surface 29 is formed. The configuration of the LED package 24B is also the same as that of the LED package 24A except that the emission wavelength band of the LED chip 26 is different.
The plan view shape of the light emitting surface 27 of the LED chip 26 included in the LED package 24A is not limited to a square, and the number of the LED chips 26 and the arrangement of the LED chips 26 It can be suitably changed according to the size.

Here, the size D3 of the light emitting surface 27 of the LED chip 26 included in the LED package 24A is in the following range. That is, the range of the size D3 is a range that can be regarded as one point in optical design, or the utilization efficiency of light when the light emitting surface 27 is disposed at the first focal point f1 of the ordinary elliptical reflecting surface 70 shown in FIG. Is a range that falls within a predetermined value. The utilization efficiency of this light is a value according to the ratio of light incident on the light guide 2 which is an example of a member having incident angle dependency of incident light with respect to outgoing light of the condensing light guide 8 . The lower limit value of the predetermined value of the light utilization efficiency is a limit value that is not considered to be inefficient in terms of product specifications. Thereby, in the optical design of the 1st reflective surface 50 of condensing type light guide 8, the light emitting surface 27 of each LED chip 26 is designed considering it as the light emission point P which is one point.
Therefore, assuming that the LED package 24A includes only one LED chip 26, the light of the LED package 24A can be obtained from the light guide 2 simply by using the elliptical reflection surface 70 shown in FIG. 6 as the first reflection surface 50. The light can be incident on the incident end face 35 with a predetermined light utilization efficiency.
However, the LED package 24A includes a plurality of LED chips 26. Therefore, with the elliptical reflection surface 70 in which the light emitting surface 27 of any one of the LED chips 26 is set to the first focal point f1, sufficient light collecting effect can not be obtained with respect to the other LED chips 26.

Therefore, as shown in FIG. 8, according to the overlapping ellipsoidal surface 80, a decrease in light utilization efficiency is suppressed. The overlapping elliptical surface 80 is a curved surface formed by overlapping a plurality of elliptical reflecting surfaces 70 defined with the light emitting surface 27 (that is, the light emitting point P) as the first focal point f1 for each of the LED chips 26 of the LED package 24A. is there. According to this superimposed ellipsoidal surface 80, the light collecting effect on the second focal point f2 is obtained for all the LED chips 26. As a result, even when the LED package 24A includes the plurality of LED chips 26, light is collected to the second focal point f2, and a decrease in light utilization efficiency is suppressed.
In particular, in the LED package 24A shown in FIG. 7, by arranging the respective LED chips 26 in the following manner, a light collecting action on the second focal point f2 can be obtained equally to all the LED chips 26. It is done. That is, an aspect in which the light emitting surface 27 of each LED chip 26 is disposed along the circumference of a virtual circle set around the center O, in other words, the light emitting surface 27 around the virtually set center O Are arranged at equal intervals. In this aspect of the arrangement, the center O is the center of the light emitting surface 29.

Here, as shown in FIG. 8, since the overlapping elliptical surface 80 is formed by connecting the outlines of the figures obtained by combining the respective elliptical reflecting surfaces 70, the boundary line 81 connecting the respective elliptical reflecting surfaces 70 is in the plane. Have complex shape. In addition to this, this overlapping elliptical surface 80 has anisotropy around the central axis L1 by each of the elliptical reflecting surfaces 70. Therefore, if the respective LED chips 26 of the LED package 24A are not arranged in alignment with the first focal point f1 of each of the elliptical reflecting surfaces 70 of the overlapping elliptical surface 80, the light collecting property is rather reduced, and the overlapping elliptical surface 80 and the LED Alignment of the package 24A is complicated.

Therefore, in the first reflection surface 50, the anisotropy around the central axis L1 is eliminated while suppressing the decrease in the light collecting property as follows.
That is, as shown in FIG. 9, the first reflective surface 50 is an elliptic curve 83 centered on the straight line connecting the center O of the light emitting surface 29 of the LED package 24A and the second focal point f2 (the central axis L1 of the first reflective surface 50). Is in the shape of a rotating body 85 rotated. The elliptic curve 83 is an elliptic curve defined with the light emitting surface 27 (light emitting point P) of any of the LED chips 26 included in the LED package 24A as the first focal point f1 and the incident end surface 35 of the light guide 2 as the second focal point. It is.

In the LED package 24A, as described above, the light emitting surface 27 (light emitting point P) of each LED chip 26 is disposed on a circle centered on the center O (that is, equally spaced around the center O) There is. Thereby, in the rotary body 85 which has rotated the elliptic curve 83, the locus Q (FIG. 7) of the first focal point f1 accompanying the rotation passes the light emitting point P of the light emitting surface 27 of all the LED chips 26. become. That is, similar to the overlapping ellipsoidal surface 80, the rotating body 85 is superposed so as to include all the components of the elliptical reflecting surface 70 defined for each light emitting surface 27 (light emitting point P) of the LED chip 26. I can say that.

Therefore, by setting the shape of the rotating body 85 to the shape of the first reflection surface 50, the decrease in the light collection performance is suppressed even when the LED package 24A includes the plurality of LED chips 26. In addition to this, since the rotating body 85 has a rotating body shape around the central axis L1, there is no anisotropy around the central axis L1, and the central axis L1 of each LED chip 26 of the LED package 24A and the first reflecting surface 50 There is no need for peripheral alignment.

In addition to the first reflection surface 50, the reflection surface 40 of the condensing light guide 8 has the second reflection surface 51 in addition to the first reflection surface 50, and the second reflection surface 51 is also the first reflection surface 50. , And is constituted by the rotating body 85.

FIG. 10 is a view showing the illuminance distribution at the second focal point f2 of the reflecting surface 40. As shown in FIG.
In the case where the first reflecting surface 50 and the second reflecting surface 51 are simple elliptical reflecting surfaces 70, as described above, the collection at the second focal point f2 due to the size D1 of the light emitting surface 29 of the LED package 24A. The light property is degraded, resulting in a distribution as shown by a broken line in FIG.
On the other hand, according to the condensing light guide 8, the first reflection surface 50 and the second reflection surface 51 are configured by the rotating body 85. As a result, as shown in FIG. 10, at the second focal point f2, an illuminance distribution having a peak that is sharpened at the central axis L1 is obtained, and the light collecting property is enhanced, and good light collecting property is obtained.

FIG. 11 is a view showing light distribution characteristics of the reflecting surface 40. As shown in FIG.
In the case where the first reflective surface 50 and the second reflective surface 51 (i.e., the reflective surface 40) are the simple elliptical reflective surface 70, the inventors have found that the half-value angle (2α) of the light distribution characteristic is about 46 It has been found that it becomes a value of ° or more.
On the other hand, it can be seen that the reflecting surface 40 has a half-value angle (2α) of about 26 degrees, and the light collecting property is enhanced compared to the elliptical reflecting surface 70.
The angle used for the half-value angle is an angle (hereinafter, referred to as “emission angle”) α formed by the light axis K and the light ray. In the description of the present embodiment, the outgoing angle α is the same as the incident angle θ to the light guide 2.

Thus, in the light collecting type light guide 8, even when the LED packages 24A and 24B provided with the plurality of LED chips 26 are used as a light source, the light collecting property at the second focal point f2 is good. Maintained. Thus, light can be efficiently incident on the light guide 2 disposed at the second focal point f2.

As described above, since the light distribution characteristic of the reflective surface 40 has a good half-value angle (2α), as shown in FIG. 11, the peak range Wp of the output angle α is approximately within 20 °. However, in this reflection surface 40, the light intensity of the range (hereinafter referred to as "side lobe range") Wa on both sides of the peak range Wp is also relatively large, and many light components having an emission angle α exceeding 20 ° are also emitted. It is understood that it is included.
As described above, the light source device 1 is used as a light source of the light guide 2 having a numerical aperture NA of 0.2 to 0.35 (maximum incident angle θmax = Arcsin (NA) = 11.5 ° to 20 °). Therefore, in the illuminance distribution at the second focal point f2, even if the central axis L1 has a sharp peak, if the light contained in the peak contains a light component having an emission angle α exceeding 20 °, the light Even if the component is incident on the light guide 2, it is lost without being guided.

Therefore, in the light source device 1, when the light collecting type light guide 8 includes the light control element 60 in the end portion on the light emission side of the reflection surface 40, the light intensity in the side lobe range Wa is reduced. ing.

FIG. 12 is a cross-sectional view of the condensing light guide 8. In the drawing, a cross section of the condensing light guide 8 cut to include the optical axis K of the reflective surface 40 is shown together with the LED packages 24A and 24B.
The light control element 60 is a transmissive optical element through which light directed to the light receiving side opening 34 in the reflective surface 40 is transmitted, and the end of the reflective surface 40 on the side of the second focal point f2 which is a light receiving point (hereinafter The light receiving point side end portion is referred to as “48”.
The light control element 60 directs the reflecting surface 40 at the light receiving point side end 48 and controls the light component H1 incident on the light control element 60 by refraction to control the second focal point at an emission angle α of a predetermined angle or less. It has a function to direct f2. In the light source device 1, the predetermined angle of the emission angle α is the maximum incident angle θmax.
More specifically, in the general elliptical reflection surface 70, the incident angle θ at which the reflected light is incident on the second focal point f2 is such that the light is reflected at a point away from the first focal point f1, ie, a point closer to the second focal point f2. It becomes so large that it reflects.

The reflecting surface 40 is formed on the basis of a plurality of elliptical reflecting surfaces 70 although not completely coincident with the elliptical reflecting surface 70. Therefore, also on this reflecting surface 40, the incident angle θ of the reflected light becomes larger as it is reflected at a point closer to the second focus f2, and the predetermined range of the predetermined range Y at the end on the second focus f2 side The light reflected by Y exceeds the maximum incident angle θmax.
Therefore, the light control element 60 controls the directivity direction of the light component H1 directed to the predetermined range Y inside the reflective surface 40, and makes the light incident on the second focal point f2 at the maximum incident angle θmax or less. Thereby, in the light distribution characteristic, the light intensity in the peak range Pw is enhanced and the light intensity in the side lobe range Wa is reduced, so that the loss in the light guide 2 can be suppressed and the efficiency can be enhanced.

FIG. 13 is an exploded view of the light control element 60. FIG.
The light control element 60 includes a first lens body 61 and a second lens body 62 as shown in FIG. The first lens body 61 refracts the light component H1 in a direction that prevents the light component H1 from entering the reflecting surface 40 at the light receiving point side end 48, and the second lens body 62 emits the light emitted from the first lens body 61. The angle α is made smaller than the maximum incident angle θmax by refraction.

More specifically, the first lens body 61 is a transmission-type optical element having a function of condensing incident light, has a substantially conical barrel 61C, and has one end face as a convex incident surface 61A. The other end surface which is formed and reduced in diameter is formed as the emission surface 61B. As shown in FIG. 13, the entrance surface 61A is disposed in accordance with the entrance position Ya where light enters the predetermined range Y, and the exit surface 61B is in front of the second focal point f2 (more precisely, the light receiving side opening 34 And the second lens body 62 is disposed at a position spaced apart to the extent that the arrangement space of the second lens body 62 is secured. The body 61 </ b> C is formed to engage with the reflective surface 40, and the first lens body 61 is fitted and fixed to the reflective surface 40.

The incident surface 61A is incident on the reflecting surface 40 of the predetermined range Y with respect to the optical axis K, that is, the light component (corresponding to the light component H1) at an angle incident on the circumferential surface of the body 61C. It is formed in the curved surface which gives refraction of a refraction angle which condenses to.
Furthermore, the curved surface of the incident surface 61A is a refracting component given to the light component H1 with respect to the light component of an angle not incident on the circumferential surface of the body 61C, that is, the light component H2 (FIG. 12) pointing to the second focal point F1 It is also a curved surface that gives less refraction than the corners.
The exit surface 61B is a surface connecting the first lens body 61 and the second lens body 62, and the entrance surface 62A of the second lens body 62 is fitted without any gap.

The second lens body 62 is a transmission type optical element having a function of condensing the light incident from the first lens body 61 at the second focal point f2, and a drum lens is used for the second lens body 62. .
The second lens body 62 has an incident surface 62 A and an exit surface 62 B formed as convex surfaces, and has a refractive index n 2 larger than the refractive index n 1 of the first lens body 61.
The second lens body 62 has an optical function of condensing the emitted light at the second focal point f2 without the emission angle α of the emitted light exceeding the maximum incident angle θmax. This optical function is realized by the setting of the curvature of the convex surface of the entrance surface 62A and the exit surface 62B and the refractive index n2.

According to the light control element 60, in the first lens body 61, the light component H1 is condensed by refraction, whereby the incidence on the body portion 61C is suppressed, and the second lens body 62 is combined with the other light components H2. It is incident. Then, in the second lens body 62, the light components H1 and H2 are focused on the second focal point f2 and once the output angle α is collected without exceeding the maximum incident angle θmax (̃20 ° in this embodiment) The Rukoto.
Further, since the light control element 60 is provided in the light receiving side opening 34 of the condensing light guide 8 and the light control element 60 collects light at the second focal point f2, the condensing property at the second focal point f2 is enhanced. Be

FIG. 14 is a view showing light distribution characteristics of the reflective surface 40 (that is, the condensing light guide 8) in which the light control element 60 is installed.
As apparent from the comparison between FIG. 14 and FIG. 11, the light distribution characteristic in the case where the light control element 60 is provided on the inner side of the reflection surface 40 is a side lobe compared to the case where the light control element 60 is not provided. The light intensity in the range Wa is largely suppressed. In addition to this, when the light control element 60 is provided inside the reflective surface 40, the light intensity is collected in the peak range Wp in which the emission angle α is in the range of 20 ° or less.

And as above-mentioned, in this condensing type light guide 8, even when it is a case where LED package 24A, 24B provided with several LED chips 26 is used for a light source, it is condensing in the 2nd focus f2 Good maintainability. Thereby, light is collected and incident on the light guide 2 disposed at the second focal point f2, and the incident light guides the light guide 2 without loss.

In the light source device 1, as described above, each of the LED packages 24A and 24B has different wavelength bands of emitted light, and the LED package 24A emits light in the first wavelength band Δλ1 and the LED package 24B has a second wavelength It emits light in the band Δλ2.
The first wavelength band Δλ1 and the second wavelength band Δλ2 are determined in accordance with the purpose of use of the light source device 1 and the like. The light source device 1 is determined based on the use of the endoscope and the material of the light guide 2. Specifically, a wavelength band of 700 nm or less (visible light of near infrared wavelength) is set to the first wavelength band Δλ1, and a wavelength band of 700 nm or more (near infrared wavelength or more) is set to the second wavelength band Δλ2. A wavelength band is set. Note that the first wavelength band Δλ1 and the second wavelength band Δλ2 may not be partially overlapping bands, that is, not completely separated bands.

The LED package 24A that emits light in the first wavelength band Δλ1 is configured by arranging a total of four LED chips 26 in a grid shape as shown in FIG. These LED chips 26 are a chip emitting red light (R), a chip emitting green light (G), a chip emitting blue light (B), and a chip emitting white light. As described above, by combining the LED chips 26 with different emission colors, it is possible to easily obtain light of a desired wavelength band.
On the other hand, the LED package 24B that emits light in the second wavelength band Δλ2 is configured by arranging four LED chips 26 that emit the same near-infrared light (IR) in a lattice as shown in FIG. . Thus, by combining the LED chips 26 of the same emission color, the light output can be easily enhanced.

And, even if each of the LED packages 24A, 24B has a large light emitting surface 29 by having each of the LED packages 24A, 24B have a plurality of LED chips 26, the following condensing light guide 8 is used to An effect like that is obtained. That is, the condensing property which condenses the light radiate | emitted from each light emission surface 29 of LED package 24A, 24B on the 2nd focus f2 is maintained favorably. In addition to this, the incident efficiency to the light guide 2 is well maintained. By these effects, it is possible to suppress the loss when light is incident on the light guide 2 and guided.

According to this embodiment described above, the following effects are achieved.
In the present embodiment, the light control element 60 housed at the light receiving point side end 48 of the reflecting surface 40 of the light collecting type light guide 8 is directed to the reflecting surface 40 of the light receiving point side end 48 to be incident. The incoming light component H1 is refracted and emitted at an emission angle α equal to or less than a predetermined angle.
As a result, in the light distribution characteristic, it is possible to obtain high light collection performance in which the light intensity is collected in the peak range Pw and the light intensity in the side lobe range Wa is greatly reduced.
Note that the predetermined angle of the output angle α is set based on the application of the light source device 1. In the light source device 1, it is set based on the maximum incident angle θmax of the light guide 2.
Further, the light control element 60 may be provided entirely in the reflecting surface 40, or a part of the emitting end may be exposed from the light receiving point side end 48 of the reflecting surface 40.

Further, in the present embodiment, the light control element 60 is configured to include the first lens body 61 and the second lens body 62. The first lens body 61 is a lens portion having an optical function of refracting and condensing the light component H1 directed to the reflection surface 40 of the light receiving point side end portion 48. The second lens body 62 is a lens portion having an optical function of making the emission angle α of the light condensed by the first lens body 61 equal to or less than a predetermined angle.
According to this configuration, the reflection of the light component H1 directed to the reflection surface 40 of the light receiving point side end portion 48 is reliably suppressed by the first lens body 61. Further, the emission angle α of the emitted light is accurately controlled by the second lens body 62 and is suppressed to a predetermined angle or less.
That is, according to the light control element 60, the suppression of the reflection of the light component H1 and the control of the emission angle α of the emitted light are performed accurately.

Further, in the present embodiment, the reflecting surface 40 (the first reflecting surface 50) of the condensing light guide 8 is formed by superposing a plurality of elliptical reflecting surfaces 70.
Specifically, the LED package 24A, which is a light source, has a light emitting surface 29 which is designed to be regarded as one light emitting point in optical design by a set of the light emitting surfaces 27 of the plurality of LED chips 26.
The elliptical reflecting surface 70 sets the light emitting surface 27 (light emitting point P) of the LED chip 26 included in the light emitting surface 29 of the LED package 24A as the first focal point f1, and the incident end face 35 of the light guide 2 as the light receiving point as the second focal point f2. And each of the light emitting surfaces 27 is defined.
The reflecting surface 40 is formed by superposing the elliptical reflecting surfaces 70 of the individual light emitting surfaces 27 to form the reflecting surface 40, so that the light collecting effect on the second focal point f2 can be obtained for all the LED chips 26. . Thereby, even in the case where the LED package 24A includes the plurality of LED chips 26, high light collection performance is maintained, and a decrease in light utilization efficiency is suppressed.

In particular, in the LED package 24A of the present embodiment, the LED chips 26 are arranged along the circumference of a circle centered on the center O, and in the reflection surface 40, the respective LEDs arranged along the circumference An elliptical reflective surface 70 is defined corresponding to the chip 26. Thereby, on the reflective surface 40 of the condensing light guide 8, the condensing action to the second focal point f 2 can be obtained equally to all the LED chips 26.

Further, in the present embodiment, the reflecting surface 40 of the condensing light guide 8 has the function of superposing each of the elliptical reflecting surfaces 70 as follows.
That is, the reflecting surface 40 is a rotating body 85 formed by rotating an elliptic curve 83 around a straight line connecting the second focus f2 and the center O of the arrangement of the LED chips 26 provided as the light source and the LED package 26A. I assume. The elliptic curve 83 is a curve which is defined with the LED chip 26 as the first focal point f1 and the incident end face 35 of the light guide 2 as the light receiving point as the second focal point f2. The rotating body 85 of the elliptic curve 83 includes all components of the elliptical reflection surface 70 defined for each light emitting surface 27 of the LED chip 26.
Therefore, by using the rotating body 85 as the reflective surface 40, the decrease in the light collection performance can be suppressed even when the LED package 24A includes the plurality of LED chips 26. In addition to this, since the rotating body 85 has a rotating body shape around the central axis L1, there is no anisotropy around the central axis L1, and the central axis L1 of each LED chip 26 of the LED package 24A and the first reflecting surface 50 It can eliminate the need for alignment around it.

Further, in the present embodiment, the reflecting surface 40 is configured to include the dichroic mirror 55 that combines the optical paths of the first reflecting surface 50 and the second reflecting surface 51. In this configuration, the second reflection surface 51 is connected to the first reflection surface 50, and the respective light paths of the first reflection surface 50 and the second reflection surface 51 are combined by the dichroic mirror 55, and the light guide is a common light receiving point. The light is condensed on the incident end face 35 of FIG.
As a result, the light sources disposed on the first reflection surface 50 and the second reflection surface 51 can be easily combined and efficiently incident on the light guide 2.

In particular, in the light source device 1 of the present embodiment, since the emission wavelengths of the light sources disposed on the first reflection surface 50 and the second reflection surface 51 are made different, the wavelength of the light incident on the light guide 2 is used It can be selected according to

The embodiment described above is merely an example of the present invention, and any modification and application can be made without departing from the spirit of the present invention.

The structure of the light control element according to the present invention is such that the light component H1 is refracted so as to block the light incident on the reflection surface 40 of the light receiving point side end 48, and the emission angle α of the emitted light is a predetermined angle or less The light control element 60 is not limited to the above-described light control element 60 as long as it has an optical function to be set.

FIG. 15 is a cross-sectional view of a condensing light guide 108 according to this modification. FIG. 16 is an exploded view of the light control element 160 according to this modification. In FIG. 15, a cross section of the condensing light guide 108 cut to include the optical axis K of the reflection surface 40 is shown together with the LED packages 24A and 24B.
The condensing light guide 108 of this modification is different from the light control element 60 in the structure of the light control element 160, and the other parts are the same as the condensing light guide 8.

The light control element 160 has a first lens body 161 that refracts the light component H1 in a direction that prevents the light component H1 from entering the reflection surface 40 of the light receiving point side end 48, and an emission angle of the outgoing light of the first lens body 161 and a second lens body 162 for adjusting α.
The first lens body 161 is a transmission type optical element having a function of condensing incident light, and has a substantially conical barrel 161C that is curved according to the reflecting surface 40 and engaged with the reflecting surface 40. One end face is formed as a convex incident surface 161A. The incident surface 161A is formed in a convex surface having different curvatures at the central portion 161A1 including the optical axis K and the peripheral portion 161A2. In the first lens body 161, the central portion 161A1 has a curvature larger than that of the peripheral portion 161A2.
As described above, when the incident surface 161A has two curvatures, control for giving refraction to each of the light component H1 and the other light components H2 is performed accurately.

The focal point of the incident surface 161A is set on the optical axis K in the body portion 161C in both the central portion 161A1 and the peripheral portion 161A2. The body portion 161C is provided with an insertion hole 161D which is recessed along the optical axis K from the end surface on the opposite side of the incident surface 161A. The second lens body 162 is inserted into the insertion hole D without a gap (without an air layer), whereby the second lens body 162 is disposed along the optical axis K in the first lens body 161. As a result, the light control element 160 is integrated.
By integrating the light control element 160 in this manner, positional deviation of the first lens body 161 and the second lens body 162 is prevented, and assembly of the light source device 1 and the condensing light guide 108 is easy. Become.

The second lens body 162 is a transmissive optical element having a function of emitting the light incident from the first lens body 161 from the emission surface 162B of a predetermined luminous flux diameter Dr. Specifically, a substantially conical lens is used for the second lens body 162, the outer peripheral surface is formed as the incident surface 162A, and the bottom surface is formed as the output surface 162B having the diameter of the light beam diameter Dr. And a refractive index n2 smaller than the refractive index n1. The luminous flux diameter Dr is set based on the irradiation range at the light receiving point, and is set based on the diameter of the incident end face 35 of the light guide 2 in the condensing light guide.

A light incident surface 162A of the second lens body 162 is a curved surface (a tapered surface, a radiation surface that gives a refraction that makes the light output surface 162B the incident light from the first lens body 161 and the emission angle α becomes a predetermined angle or less). It is formed in an object plane or an elliptical surface).
Therefore, from the exit surface 162B of the second lens body 162, the exit angle α is equal to or less than the predetermined angle, and the exit light of the predetermined light flux diameter Dr is emitted.
Thus, according to the light collecting type light guide 108, light can be collected within the range of the incident end face 35 of the light guide 2 and light can be emitted without loss in the light guide 2.

For example, in the embodiment described above, in the LED packages 24A and 24B provided with a plurality of LED chips 26 arranged on a circle, another LED chip 26 may be arranged inside the LED chips 26.

For example, instead of the LED packages 24A and 24B including the plurality of LED chips 26, as shown in FIG. 17, a COB-type LED 124 (COB: Chip on Board) may be used. The COB type LED 124 is an example of a surface emitting light source (surface light source) in which a large number of light emitting surfaces 129 are formed by closely arranging a large number of LEDs.
In this case, the shape of the first reflection surface 150 is a shape of the rotating body 185 obtained by rotating an elliptic curve around a straight line connecting the center O of the light emitting surface 129 and the second focal point f2. The elliptic curve is a curved surface that has a first focus f1 at a position off the center O of the light emission surface 129 and the second end f2 of the light guide 2 as a light reception point. It is. At this time, it is preferable that the position of the first focal point f1 on the light emitting surface 129 be a midpoint between the center O of the light emitting surface 129 and the outer edge 129A.

In the embodiment described above, the light emitting element is not limited to the LED, and may be another semiconductor type element.

In the embodiment described above, although the light of the two LED packages 24A and 24B is combined by the dichroic mirror 55, the present invention is not limited to this. That is, for example, in place of the dichroic mirror 55, a dichroic prism may be used to combine three or more lights. In addition, the reflection surface 40 may be configured by only the first reflection surface 50 without providing the second reflection surface 51 on the reflection surface 40.

Also, for example, in the above-described embodiment, the reflective surface 40 may be an elliptical reflective surface 70 if the size of the light source does not impair the light collecting property.
When the reflecting surface 40 is an elliptical reflecting surface 70, the following reflecting surface may be provided on the side of the light emitting point (first focal point f1). That is, this reflective surface reflects the light of the light source toward the reflective surface 40 on the side of the light receiving point (the second focal point f2), and the predetermined incident on the light receiving point by the reflection on the reflective surface 40 on the side of the light receiving point. It is a curved reflective surface that obtains light directed at an angle. The technology disclosed in Japanese Patent Application No. 2012-232292 can be used for this reflective surface.

FIG. 18 is a schematic view of a reflective surface 140 according to the present modification.
As shown in FIG. 18, the reflecting surface 40 is a complex elliptical mirror in which a hyperbolic reflecting surface 140A is provided in a reflecting area Rc on the side of the first focal point f1 in the elliptical reflecting surface 70.
The hyperbolic reflecting surface 140A reflects the reflected light (primary reflected light) obtained by reflecting the light of the light source on the side of the second focal point f2 of the elliptical reflecting surface 70 (secondary reflected light), and makes the second focal point f2 predetermined. It is a reflective surface which obtains the reflected light directed at the angle of and has a hyperboloid shape.
Specifically, the hyperbolic reflecting surface 140 A causes the reflected light (primary reflected light) to be incident on the reflecting surface of the light receiving point side end 48 of the elliptical reflecting surface 70. In addition, when the hyperbolic reflecting surface 140A is reflected by the reflecting surface of the light receiving point side end portion 48, it is contained in the incident end surface 35 of the light guide 2 and is incident on the incident end surface 35 at the maximum incident angle θmax or less. Light (primary reflected light) is incident on the reflection surface of the light receiving point side end 48.
Thereby, the reflected light (primary reflected light) in the reflection area Rc is reflected by the reflection on the elliptical reflection surface 70 and directed to an angle smaller than the maximum incident angle θmax and within the range of the aperture diameter D2 of the light guide 2 It becomes. Therefore, much of the reflected light in the reflection area Rc can be made incident on the light guide 2, and the utilization efficiency of light emission of the LED packages 24, 24B can be enhanced.
Furthermore, by providing the light control elements 60 and 160 inside the light receiving point side end portion 48 of the reflecting surface 14, light can be efficiently incident on the light guide 2 and can be guided without loss.
The curved surface of the hyperbolic reflecting surface 140A can be obtained by optical design as appropriate based on the size of the range of the portion corresponding to the light receiving point side end portion 48 of the elliptical reflecting surface 70, the curvature, and the like.

1 light source device 7A, 7B light source unit 8, 108 light collecting type light guide (light guide component)
24A, 24B LED package (light source)
26 LED chip 27 Light emitting surface (light emitting point)
29 light emitting surface of light source 129 light emitting surface of surface emitting light source 32, 33 light source side opening 34 light receiving side opening 35 incident end face 40, 140 reflecting surface 48 light receiving point side end 50, 150 first reflecting surface (reflection surface)
51 second reflecting surface 55 dichroic mirror (optical path combining optical element)
60, 160 light control element 61, 161 first lens body 62, 162 second lens body 70 elliptical reflecting surface 80 overlapping elliptical surface 81 boundary line 83 elliptic curve 85, 185 rotating body f1 first focal point f2 second focal point K optical axis L1, L2 Center axis M Intersection O Center of arrangement P Light emitting point Y Predetermined range Ya Approach position Wa Side lobe range Wp Peak range θmax Maximum angle of incidence

Claims (7)

1. A reflective surface extending along the optical axis from the light source to the light receiving point, and reflecting the light of the light source onto the light receiving point by reflection;
   A light control element housed at an end of the reflecting surface on the side of the light receiving point;
   The light control element is
   A light guide component comprising: a reflection surface at an end portion on the side of the light receiving point, refracting incident light, and emitting the light at an emission angle equal to or less than a predetermined angle.
2. The light control element is
   A first lens body that refracts and focuses light directed to a reflection surface at an end on the side of the light receiving point;
   A second lens body for setting an outgoing angle of light incident from the first lens body to a predetermined angle or less;
   The light guide component according to claim 1, comprising:
3. The light guide component according to claim 2, wherein the second lens body having a refractive index larger than that of the first lens body is accommodated in the first lens body.
4. The reflective surface is
   The light emitting point of the light source having a light emitting surface in which a plurality of light emitting points are gathered is a first focal point, and the light receiving point is a second focal point, and each of elliptical reflecting surfaces defined for each light emitting point is superimposed. The light guiding component according to any one of claims 1 to 3, characterized in that
5. The reflective surface has a first reflective surface on the side of the light source of an elliptical reflective surface having the light source as a first focus and the light receiving point as a second focus,
   The first reflection surface is
   The light of the light source is reflected to be incident on the side of the light receiving point of the elliptical reflection surface, and the incident angle to the light receiving point of the light reflected on the side of the light reception point of the elliptical reflection surface by the incident is predetermined The light guiding component according to any one of claims 1 to 3, wherein light having an angle equal to or less than the angle of is incident on the side of the light receiving point of the elliptical reflection surface.
6. A light guiding component according to any one of claims 1 to 5, comprising:
   A light source device characterized in that the light of the light source is made incident on an incident end face of a light guide disposed at the light receiving point.
7. The light guiding component is
   Said reflective surface,
   An optical path combining optical element that combines the optical paths of the respective reflecting surfaces,
   The other reflecting surface is connected to one of the reflecting surfaces, and the optical paths of the reflecting surfaces are combined by the optical path combining optical element and collected at a common light receiving point. The light source device according to claim 6, wherein the light source devices have different wavelength bands.
   

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