JP2014174192A - Optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device in which an emission end part of a light guide member and an optical conversion member are stably and highly accurately positioned with each other, deviation in quality can be reduced in mass production, and desired optical characteristics can be obtained.SOLUTION: In an optical device 10, position control means 80 includes: optical axis direction control means 81 which controls a relative position in the optical axis 11 direction; radial direction control means 83 which controls the relative position in the radial direction; and inclination direction control means 85 which controls the relative position in the inclination direction.

Description

  The present invention relates to an optical device having a light guide unit and an illumination unit.

  In recent years, various optical devices have been disclosed. As an example of an optical device, the optical device is disposed at a light guide member such as an optical fiber that guides light emitted from a small solid light source, and an output end of the light guide member, and is guided by the light guide member. A light conversion member that changes the wavelength of the emitted light or scatters the light to a desired irradiation pattern or color.

  Such an optical device is disclosed in Patent Document 1, for example. Patent Document 1 describes a wavelength conversion member that functions as a light conversion member, a reflector for efficiently extracting light, a shape of the reflector, and a positional relationship between the wavelength conversion member and the reflector.

In Patent Document 1, when excitation light is emitted from the emission end of the optical fiber and irradiates the wavelength conversion member, illumination light that is light obtained by wavelength conversion of the excitation light by the wavelength conversion member is generated in all directions. And has proposed a structure for efficiently taking out illumination light generated in all directions in a desired direction.
Specifically, the output end of the optical fiber is separated from the wavelength conversion member, and a tapered reflector is disposed around the output end, the wavelength conversion member, and the separated portions. The output end, the reflector, and the wavelength conversion member have a ferrule that holds the optical fiber including the output end, a tapered through hole, and a reflector is disposed on the tapered inner peripheral surface. And a holder. Further, the wavelength conversion member is held inside, and has a taper shape substantially the same as that of the through hole, and the light transmitting member disposed in the through hole so that the side surface of the taper shape is in contact with the inner peripheral surface of the holder. It is arranged.

  When these are assembled, the light transmitting member including the wavelength converting member is disposed in the through-hole, the side surface of the light transmitting member is positioned and abutted on the inner peripheral surface of the holder, and the light transmitting member is fixed by an adhesive or the like. The Thereafter, the ferrule holding the optical fiber is positioned and fixed with respect to the holder so that the emission end portion is in contact with the light transmitting member and is positioned relative to the wavelength conversion member.

JP 2011-123368 A

  In Patent Document 1, the relative positions of the emission end of the optical fiber and the light conversion member are aligned via the light transmission member and the holder. In this case, the portions where the holder and the light transmitting member are in contact with each other are positioned on the inner peripheral surface of the tapered holder and the outer peripheral surface of the tapered light transmitting member. For this reason, in this portion, for example, the holder and the light transmitting member come into contact with each other and get caught, and therefore, a gap is generated between the emission end portion and the light transmitting member, or the light transmitting member with respect to the holder. May be tilted and fixed. As a result, the light conversion member is displaced with respect to the emission end.

  Thus, it is not easy and more stable that the light conversion member is positioned relatively accurately with respect to the emission end of the optical fiber. As a result, when optical devices are mass-produced, the quality varies. When the emission end portion and the light conversion member are displaced relative to each other, the optical device may not obtain the original illumination performance.

  The present invention has been made in view of these circumstances, and the exit end portion of the light guide member and the light conversion member are positioned stably and with high accuracy, and can reduce variation in quality during mass production. An object of the present invention is to provide an optical device capable of obtaining the optical characteristics of

  In order to achieve the object, the present invention has an emission part that emits primary light, a light guide unit that guides the primary light, and a light guide unit that guides the primary light from the emission part. Different from the primary light by being irradiated with the primary light incident from the incident part where the emitted primary light is incident and spaced apart from the incident part and incident from the incident part A generating member that generates secondary light, and an illumination unit that illuminates the observation object using the secondary light as illumination light, and the emitting portion and the incident portion are optically connected to each other. A center of the light emitted by the emitting unit, the holding unit holding the light guide unit and the illumination unit, and a position control unit that controls a relative position between the emitting unit and the generating member. The axial direction is referred to as the optical axis direction and is orthogonal to the optical axis direction. Is referred to as a radial direction, a direction inclined in the optical axis direction is referred to as an inclination direction, and the position control means includes an optical axis direction control means for controlling the relative position in the optical axis direction, and the relative direction in the radial direction. There is provided an optical device comprising: a radial direction control unit that controls a position; and a tilt direction control unit that controls the relative position in the tilt direction.

  According to the present invention, there is provided an optical device in which an emission end portion of a light guide member and a light conversion member are positioned stably and with high accuracy, can reduce variation in quality during mass production, and obtain desired optical characteristics. can do.

FIG. 1A is a diagram showing an optical device according to the first embodiment of the present invention. FIG. 1B is a schematic diagram of an illumination unit including an optical axis direction control unit, a radial direction control unit, and a tilt direction control unit. FIG. 1C is a schematic view of a holding unit including a radial direction control unit and an inclination direction control unit. FIG. 1D is a diagram illustrating a relationship between the taper angle θ1 of the insertion housing portion and the taper angle θ2 of the insertion portion. FIG. 2A is a diagram illustrating a state in which the relative position between the primary light incident portion and the light conversion member in the optical axis direction is controlled, and the illumination unit is accommodated in the accommodation portion. FIG. 2B is a diagram illustrating a state in which the relative position between the primary light incident portion and the light conversion member in the optical axis direction is controlled, and the main body portion is fitted to the main body fitting portion. FIG. 2C is a diagram in which the main body portion is fitted into the main body fitting portion, and the relative positions of the primary light incident portion and the light conversion member in the optical axis direction, the radial direction, and the tilt direction are positioned. FIG. 3 is a diagram illustrating the optical device according to the first modification example of the first embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The first embodiment will be described with reference to FIGS. 1A, 1B, 1C, 1D, 2A, 2B and 2C. In some of the drawings, illustration of members is omitted for clarity of illustration.
Hereinafter, the central axis of the primary light emitted from the primary light emitting portion 21a is referred to as an optical axis 11.
The central axis direction of the primary light is referred to as the optical axis 11 direction. Further, in the direction of the optical axis 11, the optical fiber 21 side is referred to as the rear, and the light conversion member 43 side is referred to as the front.
A direction perpendicular to the direction of the optical axis 11 is referred to as a radial direction.
A direction inclined in the direction of the optical axis 11 is referred to as an inclination direction.

[Optical device 10]
As shown in FIG. 1A, the optical device 10 includes a light guide unit 20 that guides primary light, and secondary light that is different from the primary light based on the primary light guided by the light guide unit 20. An illumination unit 40 that generates and illuminates the observation object with secondary light as illumination light, and a holding unit 60 that holds the light guide unit 20 and the illumination unit 40 are included.

[Light guide unit 20]
In the primary light guided by the light guide unit 20, the primary light is emitted from a light source unit (not shown) such as a semiconductor laser. The primary light is, for example, blue-violet laser light having a wavelength of, for example, around 400 nm.

  As shown in FIG. 1A, the light guide unit 20 includes, for example, an optical fiber 21 that is a light guide member. The optical fiber 21 is disposed at one end portion of the optical fiber 21 (not shown), and is disposed at an incident portion (not shown) into which primary light emitted from the light source portion is incident, and at the other end portion of the optical fiber 21. A primary light emitting portion 21a for emitting light. The primary light emitting portion 21 a is formed as a plane in which the other end portion of the optical fiber 21 is orthogonal to the central axis (direction of the optical axis 11) of the optical fiber 21. An incident part (not shown) is optically connected to the light source part, and the primary light emitting part 21 a is optically connected to the illumination unit 40. The optical fiber 21 guides the primary light from the incident part to the primary light emitting part 21a. The primary light is emitted from the primary light emitting portion 21a at a desired spread angle.

  Such an optical fiber 21 has, for example, flexibility and flexibility, can be bent, and has a cylindrical shape. The optical fiber 21 has an optical characteristic that guides primary light efficiently, and is made of, for example, glass or plastic. The optical fiber 21 is, for example, an optical fiber 21 that is a multimode fiber. For example, the core diameter of the optical fiber 21 is 50 μm, and the numerical aperture NA is 0.2. The optical fiber 21 has an optical characteristic that guides the primary light forward with high efficiency so that the primary light is emitted forward from the primary light emitting portion 21a without a large energy loss. At this time, the emission angle of the primary light is determined by the numerical aperture of the optical fiber 21 and the refractive index of a light transmitting member described later.

  As shown in FIG. 1A, the light guide unit 20 has a jacket that is, for example, a resin coating layer 23 that covers most of the optical fiber 21. The coating layer 23 is disposed from one end of the optical fiber 21 to the other end of the optical fiber 21. Specifically, the coating layer 23 is only disposed up to the vicinity of the guide opening 63 of the holding unit 60 on the other end side, and is inserted into a light guide fitting unit 61 described later of the holding unit 60. Not. For this reason, the other end portion of the optical fiber 21 is exposed from the coating layer 23.

[Lighting unit 40]
As shown in FIGS. 1A and 1B, the illumination unit 40 is optically connected to the primary light emitting unit 21a, guided by the light guide unit 20, and emitted from the primary light emitting unit 21a. The primary light incident part 41 on which light is incident and the primary light incident part 41 are arranged apart from the primary light incident part 41 and irradiated with the primary light incident from the primary light incident part 41. A light conversion member 43 that is a generation member that converts the optical characteristics and generates secondary light as illumination light different from the primary light, and a secondary light emitting unit 45 that emits the secondary light to the outside of the illumination unit 40. And have.
As shown in FIGS. 1A and 1B, the illumination unit 40 has a primary light incident portion 41 and the primary light incident portion 41 and the light conversion so that the primary light and the secondary light are transmitted. A light transmission member 47 is further provided between the member 43 and the light transmission member 47 which is disposed at least partially continuously from the primary light incident portion 41 to the side of the secondary light emitting portion 45. .
These members included in the illumination unit 40 have a concentric shape with the optical axis 11 as a central axis, and are disposed rotationally symmetrically about the optical axis 11.

[Primary light incident part 41]
As shown in FIG. 1A, the primary light incident portion 41 is formed on a part of the rear surface 47a of the light transmitting member 47 with which the primary light emitting portion 21a abuts. More specifically, in the light transmitting member 47, a part of the rear surface 47 a to which the primary light emitting portion 21 a is optically connected is formed as the primary light incident portion 41. The rear surface 47a is a flat surface disposed, for example, at the rearmost side of the light transmission member 47 in the direction of the optical axis 11. The primary light incident portion 41 and the rear surface 47 a are disposed orthogonal to the optical axis 11. The central axis of the primary light incident portion 41 is disposed on the optical axis 11 and is formed on the central axis of the light transmitting member 47. The primary light incident part 41 has substantially the same shape and area as the primary light emitting part 21a. The primary light incident part 41 is smaller than the secondary light emitting part 45.

[Light Conversion Member 43 (Generation Member)]
The light conversion member 43 is, for example, light having a light distribution characteristic different from the light distribution characteristic of the primary light by converting the light distribution characteristic of the primary light as desired without changing the wavelength of the primary light. Generate next light. Thus, the light conversion member 43 is a light distribution conversion member that converts the light distribution characteristic of the primary light as desired, is a generation member that generates secondary light, and functions when irradiated with the primary light. It is an optical member.
The light conversion member 43 may function as a wavelength conversion member that converts the wavelength of the primary light as desired and generates secondary light that is light having a wavelength different from the wavelength of the primary light.

  That is, the light conversion member 43 has at least one of light distribution conversion characteristics such as scattering and wavelength conversion characteristics.

  In the configuration of the light conversion member 43 having the light distribution conversion characteristics, the light conversion member 43 may be formed by a member having a surface on which minute irregularities are disposed, such as a microlens array, or a light distribution. It may be formed by binding a particulate member having conversion characteristics to glass or a transparent resin, or by forming particulate glass having light distribution characteristics directly on a transparent resin at a high pressure. Also good.

  In the configuration of the light conversion member 43 having wavelength conversion characteristics, the light conversion member 43 may be a rigid body such as ceramic. Alternatively, the light conversion member 43 may be formed by binding a particulate member having wavelength conversion characteristics to glass or transparent resin, or the particulate member having wavelength conversion characteristics is directly molded at a high pressure. May be formed.

  When the light conversion member 43 has one of the light distribution conversion characteristic and the wavelength conversion characteristic, the light conversion member 43 has one of the configurations described above.

  When the light conversion member 43 has both the light distribution conversion characteristic and the wavelength conversion characteristic, the light conversion member 43 is a mixture of a particulate member having the light distribution conversion characteristic and a particulate member having the wavelength conversion characteristic. Thus, it is only necessary to have a mixture that is formed into a bind or high pressure. Or the light conversion member 43 should just have the laminated body shape | molded by laminating | stacking one above-mentioned structure on the other structure in the optical axis 11 direction. Furthermore, a particulate member having both the light distribution conversion characteristic and the wavelength conversion characteristic may be formed into a bind or high pressure.

  Thus, the light conversion member 43 includes a light distribution conversion member, a wavelength conversion member, a mixture formed by mixing the light distribution conversion member and the wavelength conversion member, a light distribution conversion member, and a wavelength conversion member. One of the two has at least one of a laminate formed by laminating the other.

  As shown in FIGS. 1A and 1B, the light conversion member 43 is opposed to the primary light emitting portion 21a and further forward of the primary light emitting portion 21a so that substantially all of the primary light is irradiated. It is arranged. The light conversion member 43 is disposed such that the central axis of the light conversion member 43 is disposed on the optical axis 11.

  As shown in FIGS. 1A and 1B, the light conversion member 43 has, for example, a cylindrical shape. For this reason, the light conversion member 43 includes a circular rear surface 43a facing the primary light emitting portion 21a and the primary light incident portion 41, a circular front surface 43b disposed in front of the rear surface 43a, and a rear surface 43a. A curved peripheral surface 43c disposed between the front surface 43b and the front surface 43b. The light conversion member 43 may have a disk shape, for example.

  As shown in FIGS. 1A and 1B, the rear surface 43 a and the front surface 43 b are planes that are disposed orthogonal to the optical axis 11. These central axes are arranged on the optical axis 11 in the rear surface 43a and the front surface 43b.

  As shown in FIG. 1A, the rear surface 43a is disposed away from the primary light emitting portion 21a. More specifically, the rear surface 43a is disposed away from the primary light emitting portion 21a and the primary light incident portion 41 so that the beam spot of the primary light formed on the rear surface 43a is formed smaller than the rear surface 43a. Has been. The rear surface 43a functions as an irradiation surface irradiated with the primary light.

  The peripheral surface 43c is disposed to be separated from a reflection member 67 described later.

  The front surface 43 b is disposed on the same plane as the front surface 47 b of the light transmitting member 47. The front surface 43 b functions as the secondary light emitting unit 45.

  The thickness of the light conversion member 43 and the above-described density are set as desired depending on how much the light conversion member 43 converts the primary light into the secondary light.

[Secondary light emitting unit 45]
As shown in FIGS. 1A and 1B, the secondary light emitting portion 45 functions as the front surface 43 b of the light conversion member 43. The secondary light emitting unit 45 has, for example, a circular shape. The secondary light emitting unit 45 emits secondary light as illumination light.

[Light transmission member 47 (optical axis direction control member)]
As shown in FIGS. 1A and 1B, the light transmitting member 47 is optically connected to the primary light emitting portion 21a, and the primary light incident from which the primary light emitted from the primary light emitting portion 21a enters. It has a rear surface 47a having a portion 41 and a front surface 47b on which a secondary light emitting portion 45 that emits secondary light is disposed. The rear surface 47a including the primary light incident portion 41 and the front surface 47b on which the secondary light emitting portion 45 is disposed are disposed orthogonal to the central axis (optical axis 11) of the light transmitting member 47. It is a plane.

  As shown in FIGS. 1A and 1B, the front surface 47b is larger than the rear surface 47a. In the front surface 47b, the region of the front surface 47b excluding the front surface 43b is disposed on the side of the front surface 43b and has a ring shape.

  Moreover, as shown to FIG. 1A, the rear surface 47a is larger than the primary light emission part 21a. Therefore, when the rear surface 47a comes into contact with the primary light emitting portion 21a, the contact portion, specifically, the portion optically connected to the primary light emitting portion 21a is formed as the primary light incident portion 41. . That is, a part of the rear surface 47 a also serves as the primary light incident part 41, and the light transmission member 47 serves both as the rear surface 47 a and the primary light incident part 41.

  As described above, the light transmitting member 47 is disposed between the primary light incident part 41 and the light conversion member 43 as a generation member in the direction of the optical axis 11 so as to have the primary light incident part 41. Thereby, the light transmission member 47 functions as an optical axis direction control member for controlling the relative position between the primary light emitting portion 21a and the light conversion member 43 in the direction of the optical axis 11 as desired.

  As described above, the light transmitting member 47 is optically connected to the primary light emitting portion 21a and the light converting member 43 in the optical axis 11 direction, and the primary light emitting portion 21a and the light converting member in the optical axis 11 direction. 43 is interposed between the primary light emitting portion 21 a and the light conversion member 43 in the direction of the optical axis 11.

In general, if the primary light is directly converted from the front surface 47b without being converted into the secondary light, there is a risk to the eyes from the viewpoint of eye-safety. Therefore, in the primary light emitted from the primary light emitting portion 21 a at a desired spread angle, at least the high intensity component of the primary light needs to travel directly to the rear surface 43 a of the light conversion member 43. In other words, the beam spot of the primary light becomes smaller than the rear surface 43a of the light conversion member 43, and the entire beam spot needs to be accommodated on the rear surface 43a. The high intensity component described above indicates, for example, a ratio of 99% of the optical energy of the primary light.
For this reason, in the direction of the optical axis 11, the distance from the rear surface 47a having the primary light incident portion 41 to the rear surface 43a needs to be within a desired range. This distance is set by, for example, the numerical aperture of the optical fiber 21, the numerical aperture of the light source unit, the refractive index of the light transmitting member 47, the diameter of the core of the optical fiber 21, the diameter of the light conversion member 43, and the like. The
Thus, in this embodiment, as shown in FIG. 1B, when the primary light emitted from the primary light emitting portion 21a irradiates the light converting member 43, the light transmitting member 47 is The length L1 is such that at least the high-intensity component of the primary light enters the light conversion member 43.

The distance is not close to 0, and the rear surface 43a may not be too close to the rear surface 47a. When the light conversion member 43 generates secondary light, the light conversion member 43 generally generates heat. In general, the density of the primary light immediately after being emitted from the primary light emitting part 21a is very high, and the density of the primary light decreases as the distance from the primary light emitting part 21a increases. For this reason, when the rear surface 43a approaches the rear surface 47a, when the light conversion member 43 generates secondary light, the light conversion member 43 generates a large amount of heat due to the primary light having a very high density, and deteriorates due to a large amount of heat generation. Resulting in. Considering this point, it is important that the intensity distribution of the primary light in the light conversion member 43 does not exceed the heat resistant temperature of the light conversion member 43 when generating the secondary light.
Therefore, in this embodiment, as shown in FIG. 1B, when the primary light is emitted from the primary light emitting portion 21a at a desired spread angle and irradiates the light converting member 43, light conversion is performed in the direction of the optical axis 11. The light transmitting member 47 has a length L1 such that the intensity distribution of the primary light in the member 43 does not exceed the heat resistance temperature of the light conversion member 43 when generating the secondary light.

  Further, as shown in FIGS. 1A and 1B, the light transmitting member 47 has, for example, the central axis of the light converting member 43 and the central axis of the light transmitting member 47 disposed on the optical axis 11, and the light converting member 43. Is separated from the primary light emitting portion 21a, the beam spot of the primary light is smaller than the rear surface 43a of the light converting member 43, the rear surface 43a is disposed parallel to the rear surface 47a in the direction of the optical axis 11, and the front surface 43b is disposed in the same plane as the front surface 47b, and the light transmitting member 47 has the light conversion member 43 so as to cover the front surface 43b and the peripheral surface 43c.

  For this reason, as shown in FIG. 1A and FIG. 1B, the light transmission member 47 has an engagement recess 47 d with which the light conversion member 43 is engaged. The engaging recess 47d is recessed toward the rear with respect to the front surface 47b. The central axis of the engaging recess 47 d is disposed on the central axis of the light transmitting member 47 so that the central axis of the light converting member 43 is disposed on the central axis of the light transmitting member 47. The engagement recess 47d has substantially the same size as the light conversion member 43, and the light conversion member 43 is fitted into the engagement recess 47d. Therefore, the rear surface 43a is installed on the bottom surface of the engaging recess 47d. The length of the engaging recess 47d in the direction of the optical axis 11 (depth of the engaging recess 47d) controls the relative distance between the primary light emitting portion 21a and the rear surface 43a in the direction of the optical axis 11. It becomes.

  In the light transmitting member 47, for example, the central axis of the light converting member 43 and the central axis of the light transmitting member 47 are disposed on the optical axis 11, and the beam spot of the primary light is transmitted from the rear surface 43a of the light converting member 43. The light conversion member 43 is separated from the primary light emitting portion 21a, the rear surface 47a, and the front surface 47b, and the light conversion member 43 is light-transmitted so that the light conversion member 43 is embedded in the light transmission member 47. You may have in the member 47 inside.

  In the light transmitting member 47, the primary light and the secondary light are transmitted. For this reason, the light transmission member 47 is formed of a member through which the primary light emitted from the primary light emitting portion 21a and the secondary light emitted from the light conversion member 43 are transmitted. Such a member is formed of, for example, an optically transparent member having a high transmittance with respect to primary light and secondary light. This member indicates, for example, silicone resin, glass, quartz glass, or the like.

  The light transmission member 47 may be formed of a member that releases heat generated when the light conversion member 43 generates secondary light to the outside. Such a member shows glass, glass-type resin, etc., for example.

  As shown in FIGS. 1A, 2A, 2B, and 2C, the light transmitting member 47 having the light converting member 43 is fixed by the adhesive 48 in the holding portion 60. The adhesive 48 has an optical property of transmitting the primary light and the secondary light, and guides the secondary light to the reflection member 67 described later. Such an adhesive 48 is, for example, a silicone-based adhesive. The adhesive 48 is applied to, for example, an outer peripheral surface of an insertion portion 473 described later and an inner peripheral surface of an insertion storage portion 653 described later.

[Shape of light transmitting member 47]
As shown in FIG. 1A and FIG. 1B, the light transmission member 47 has a shape like an Erlenmeyer flask, for example. Therefore, the light transmitting member 47 has a rear surface 47 a including the primary light incident portion 41, is disposed on a part of the light transmitting member 47, and is disposed behind the light transmitting member 47. It is integrated with the main body portion 471 so as to be coaxially arranged with the portion 471, and is disposed at the other portion of the light transmitting member 47 so as to be optically connected to the light conversion member 43 which is a generation member. And an insertion portion 473 disposed in front of the light transmission member 47.

  The central axis of the main body portion 471 is coaxial with the central axis of the insertion portion 473. The central axis of the main body portion 471 and the central axis of the insertion portion 473 form the central axis of the light transmission member 47. In the direction of the optical axis 11, the main body portion 471 is shorter than the insertion portion 473.

[Main Body 471]
As shown in FIG. 1A and FIG. 1B, the main body portion 471 is fitted into a main body fitting portion 651 described later of the holding portion 60. The main body 471 has, for example, a cylindrical shape.

  As shown in FIGS. 1A and 1B, as described above, the main body 471 has the rear surface 47a including the primary light incident portion 41, so the diameter of the main body 471 is larger than the diameter of the primary light emitting portion 21a. . The diameter of the main body 471 is smaller than the diameter of the light conversion member 43.

[Insert part 473]
As shown in FIG. 1A and FIG. 1B, the insertion portion 473 is inserted into an insertion accommodating portion 653 that is an insertion accommodating portion 653 to be described later of the holding portion 60. The main body portion 471 has a truncated cone shape whose diameter increases from the main body portion 471 toward the light conversion member 43 in the direction of the optical axis 11, in other words, from the rear to the front. The light conversion member 43 is disposed in the insertion portion 473.

  As shown in FIG. 1A and FIG. 1B, the insertion portion 473 functions as a front surface 47b and an upper surface 473a on which the rear surface 47a is exposed and the main body 471 is integrated with the insertion portion 473, It has a lower surface 473b larger than the upper surface 473a and a tapered outer peripheral surface 473c.

The diameter of the upper surface 473a is the same as the diameter of the main body 471.
The lower surface 473b has an engaging recess 47d.
The outer peripheral surface 473c is continuous with the outer peripheral surface of the main body 471.

  As described above, when the light conversion member 43 is embedded in the light transmission member 47, the light conversion member 43 is preferably embedded in the insertion portion 473.

[Holding unit 60]
As shown in FIGS. 1A and 1C, the holding unit 60 connects the light guide unit 20 and the illumination unit 40 so that the primary light emitting unit 21a and the primary light incident unit 41 are optically connected to each other. Hold. The holding part 60 is made of, for example, ceramic, stainless steel, brass, nickel, or the like.

  As shown in FIGS. 1A and 1C, the holding part 60 is disposed at one end of the holding part 60 and a light guide fitting part 61 into which at least the primary light emitting part 21a of the optical fiber 21 is fitted. The light guide fitting portion 61 communicates with the light guide fitting portion 61 so that the optical fiber 21 is inserted into the light guide fitting portion 61. The central axis of the light guide fitting part 61 and the central axis of the guide port part 63 are arranged on the central axis of the holding part 60.

[Light guiding fitting 61]
As shown in FIGS. 1A and 1C, the light guide fitting portion 61 is a hole having, for example, a cylindrical shape into which the optical fiber 21 is fitted, and is a cylindrical hollow portion into which the optical fiber 21 is fitted. The diameter of the light guide fitting portion 61 is substantially the same as or slightly larger than the diameter of the optical fiber 21. The light guide fitting portion 61 positions the optical fiber 21 in the radial direction and the tilt direction. Thus, the light guide fitting portion 61 is disposed so that the holding portion 60 positions and holds the optical fiber 21 including the primary light emitting portion 21a.

[Guide Port 63]
As shown in FIG. 1A, the guide port portion 63 has a truncated cone shape whose diameter is reduced from one end portion of the holding portion 60 toward the light guide fitting portion 61, and is formed as an inclined taper. Has been. Note that the above-described coating layer 23 is only disposed up to the vicinity of the guide port portion 63 and is not inserted into the light guide fitting portion 61. For this reason, the other end portion of the optical fiber 21 is exposed from the coating layer 23.

  An adhesive member 63 a is disposed in the guide opening 63. The bonding member 63 a bonds the other end of the optical fiber 21 including the coating layer 23 to the holding unit 60. The adhesive member 63 a is also disposed on the coating layer 23. The adhesive member 63a is, for example, an adhesive such as silicone or epoxy.

[Accommodating portion 65]
Further, as shown in FIGS. 1A and 1C, the holding unit 60 further includes an accommodating portion 65 that accommodates a light transmitting member 47 that functions as an optical axis direction control member. The accommodating portion 65 is a hole into which the light transmitting member 47 is inserted and fitted, and is a hollow portion into which the light transmitting member 47 is inserted and fitted. The accommodating portion 65 communicates with the light guide fitting portion 61 and is disposed in the same holding portion 60 as the light guide fitting portion 61. That is, the holding unit 60 holds the optical fiber 21 and the illumination unit 40 integrally.

  Specifically, as shown in FIG. 1A and FIG. 1C, the housing portion 65 is fitted with a main body portion 471 of a light transmitting member 47 that is a part of the optical axis direction control member, and is part of the housing portion 65. The main body fitting portion 651 and the insertion portion 473 of the light transmission member 47 which is the other portion of the optical axis direction control member are inserted, and the insertion accommodating portion 653 disposed in the other portion of the accommodating portion 65. And have. The central axis of the accommodating portion 65 is disposed on the central axis of the holding portion 60, and is disposed coaxially with the central axis of the light guide fitting portion 61.

[Body fitting portion 651]
As shown in FIGS. 1A and 1C, the main body fitting portion 651 is disposed behind the housing portion 65, communicates with the light guide fitting portion 61 in the direction of the optical axis 11, and has a cylindrical shape. The main body portion 471 is fitted and smaller than the insertion portion 473. For this reason, the diameter of the main body fitting portion 651 is substantially the same as or slightly larger than the diameter of the main body portion 471. Further, the main body fitting portion 651 is sandwiched between the light guide fitting portion 61 and the insertion housing portion 653 in the direction of the optical axis 11 and communicates with the light guide fitting portion 61 and the insertion housing portion 653. The diameter of the main body fitting portion 651 is larger than the diameter of the light guide fitting portion 61.

  As shown in FIGS. 1A and 1C, the main body fitting portion 651 is fitted with the main body portion 471 so that the primary light emitting portion 21a is optically connected to the primary light incident portion 41. Further, when the light transmitting member 47 is inserted into the accommodating portion 65, the cylindrical main body 471 is fitted to the cylindrical main body so that the central axis of the light conversion member 43 is disposed on the optical axis 11. It fits with the part 651.

[Accommodating portion 653]
As shown in FIGS. 1A and 1C, the insertion housing portion 653 is disposed in front of the housing portion 65 and is larger than the insertion portion 473 and the insertion portion 473 is inserted therein. The insertion accommodating portion 653 has a truncated cone shape whose diameter increases in the direction of the optical axis 11 from the distal end portion of the accommodating portion 65 where the main body fitting portion 651 is disposed toward the proximal end portion of the control accommodating portion 65 indicating the front. Have.

As shown in FIGS. 1A and 1D, the insertion portion 473 is inserted into the insertion portion 473 having a truncated cone shape and the insertion receiving portion 653 having a truncated cone shape larger than the insertion portion 473 and into which the insertion portion 473 is inserted. The taper angle θ1 of the insertion housing portion 653 is inserted so that a gap is formed between the inner circumferential surface of the insertion housing portion 653 and the outer circumferential surface 473c of the insertion portion 473 when inserted into the housing portion 653. The taper angle θ2 of the portion 473 is larger.
The taper angle θ <b> 1 indicates an angle formed between the optical axis 11 and the inner peripheral surface of the insertion housing portion 653, for example.
The taper angle θ2 represents an angle formed between the optical axis 11 and the outer peripheral surface 473c of the insertion portion 473, for example.

  As shown in FIG. 1C, the accommodating portion 65 including the main body fitting portion 651 that is a part as described above and the insertion accommodating portion 653 that is another portion follows the shape of the light transmitting member 47, for example, an Erlenmeyer flask. It has such a shape.

  As shown in FIG. 1A, the main body portion 471 and the main body fitting portion 651 are engaged with each other between the primary light emitting portion 21a and the light conversion member 43 in the radial direction by fitting the main body portion 471 with the main body fitting portion 651. The relative position is positioned, and the main body portion 471 positions the relative position between the primary light emitting portion 21a and the light conversion member 43 in the inclination direction with respect to the main body fitting portion 651. Specifically, the primary light incident portion 41 is fitted by the main body portion 471 and the main body fitting portion 651 so that the primary light emitting portion 21a and the primary light incident portion 41 are optically connected to each other. Are positioned in the radial direction and the tilt direction. Accordingly, the light converting member 43 engaged with the engaging recess 47d of the light transmitting member 47 is also positioned in the radial direction and the inclined direction by the light transmitting member 47 having the primary light incident portion 41. Thus, the primary light emitting part 21a, the light guide fitting part 61, the main body part 471, and the main body fitting part 651 are formed by the primary light emitting part 21a and the light conversion member 43 in the radial direction and the inclination direction. The relative position will be controlled. At the same time, the light conversion member 43 is positioned in the optical axis direction by the light transmitting member 47 functioning as an optical axis direction control member.

  And the light guide fitting part 61, the accommodating part 65, the primary light emitting part 21a, and the primary light incident part 41 so that the primary light emitting part 21a and the primary light incident part 41 are optically connected to each other. And the light transmitting member 47 are arranged coaxially with each other.

[Reflection member 67]
As illustrated in FIG. 1A, the housing portion 65 is disposed on the inner peripheral surface of the insertion housing portion 653 and includes a reflecting member 67 that reflects secondary light. The reflection member 67 is disposed so as to cover the rear surface 43 a and the peripheral surface 43 c of the light conversion member 43 and the peripheral surface 473 c of the insertion portion 473. For this reason, the reflection member 67 is disposed away from the light conversion member 43 by the light transmission member 47. The reflection member 67 reflects the secondary light emitted toward the reflection member 67 from the rear surface 43a and the peripheral surface 43c of the light conversion member 43 toward the front surface 47b that is the front. Thereby, the reflecting member 67 controls the radiation angle of the secondary light.

  As described above, the reflecting member 67 has a high reflectivity with respect to the secondary light so as to reflect the secondary light as much as possible toward the front surface 47b. For example, when the secondary light is visible light, the reflecting member 67 is formed by forming a film of a metal such as gold, silver, or aluminum. Alternatively, the reflecting member 67 may be formed by multilayering a plurality of dielectric films. The reflecting member 67 may be disposed on the entire outer peripheral surface of the light transmitting member 47.

  The surface of the reflecting member 67 is protected by a protective film (not shown). When the reflecting member 67 is formed of a metal such as silver or aluminum, the protective film prevents the metal from being oxidized or sulfided by coming into contact with air and the reflectance of the reflecting member 67 from being lowered. Moreover, since the reflecting member 67 is very thin, the strength of the reflecting member 67 is low. Therefore, the protective film prevents the reflective member 67 from coming into contact with other members and being worn. Such a protective film is formed of, for example, SiO 2 having a high secondary light transmittance and a high mechanical strength.

[Position control means 80]
As shown in FIGS. 1A, 1B, and 1C, the optical device 10 further includes position control means 80 that controls the relative position between the primary light emitting portion 21a and the light conversion member 43 that is a generation member. doing. The position control means 80 includes an optical axis direction control means 81 for controlling the relative position in the optical axis 11 direction, a radial direction control means 83 for controlling the relative position in the radial direction, and an inclination direction control for controlling the relative position in the inclination direction. Means 85.

[Optical axis direction control means 81]
As shown in FIGS. 1A and 1B, the optical axis direction control means 81 is arranged between the primary light incident part 41 and the light conversion member 43 in the optical axis 11 direction so as to have the primary light incident part 41. The light transmission member 47 is provided and functions as an optical axis direction control member for controlling the relative position in the optical axis 11 direction as desired. The light transmitting member 47 controls the relative position as desired by adjusting the length L1 of the light transmitting member 47 between the primary light incident portion 41 and the rear surface 43a in the direction of the optical axis 11, for example.

[Radial direction control means 83 / inclination direction control means 85]
As shown in FIG. 1A, FIG. 1B, and FIG. 1C, the radial direction control means 83 and the inclination direction control means 85 are the primary light emitting part 21a and the light transmission member 47 that functions as an optical axis direction control member. It has a primary light emitting part 21 a, a main body part 471 that is a part of the light transmission member 47, a light guide fitting part 61 and a main body fitting part 651 disposed in the holding part 60.

[Action]
As shown in FIG. 2A, the optical fiber 21 is fitted into the light guide fitting portion 61 so that the primary light emitting portion 21 a is disposed on the same plane as the bottom surface portion of the main body fitting portion 651. As shown in FIG. 1A, the optical fiber 21 is bonded to the holding portion 60 by the adhesive member 63a at the guide port portion 63.

  As shown in FIG. 1B and FIG. 2A, in the light transmissive member 47 having the light conversion member 43, the primary light incident portion 41 in the optical axis 11 direction is determined by the length L1 of the light transmissive member 47 in the optical axis 11 direction. The relative position with respect to the light conversion member 43 is controlled.

As shown in FIG. 2A, when the light transmission member 47 is a rigid body such as glass, the adhesive 48 is applied to the inner peripheral surface of the insertion housing portion 653 in advance. The adhesive 48 is applied so as not to include dust or bubbles. The light transmitting member 47 having the light converting member 43 is accommodated in the accommodating portion 65. At this time, the main body portion 471 is inserted into the accommodating portion 65 as the head of the light transmitting member 47. In the frustoconical insertion housing portion 653, the main body portion 471 is guided by the tapered inner peripheral surface of the insertion housing portion 653 and proceeds to the main body fitting portion 651.
At this time, the main body portion 471 and the insertion portion 473 are smaller than the insertion accommodating portion 653. Further, the taper angle θ1 of the insertion housing portion 653 is larger than the taper angle θ2 of the insertion portion 473. For this reason, when the main body portion 471 proceeds to the main body fitting portion 651 as described above, the tapered outer peripheral surface 473c of the insertion portion 473 is prevented from sliding on the tapered inner peripheral surface of the insertion accommodating portion 653. Is done.

  Then, as shown in FIGS. 2B and 2C, the main body portion 471 is fitted into the main body fitting portion 651 so that the primary light incident portion 41 is optically connected to the primary light emitting portion 21a. The relative position between the primary light emitting portion 21a and the light conversion member 43 in the direction of the optical axis 11 is controlled by the length L1 of the light transmission member 47 in the direction of the optical axis 11 so as to ensure eye-safety.

Further, as shown in FIGS. 2B and 2C, when the primary light emitting portion 21a and the light conversion member 43 are displaced in the radial direction and the inclined direction, that is, when a misalignment occurs, the primary light emitting portion 21a The emitted primary light is displaced from the light transmitting member 47 in the radial direction. Thereby, as described above, the primary light is not converted into the secondary light and is directly emitted from the front surface 47b, and thus has a risk to the eyes from the viewpoint of eye-safety.
However, in the present embodiment, the relative position between the primary light emitting portion 21a and the light conversion member 43 in the radial direction is controlled so that the eye-safe is ensured by fitting the main body portion 471 to the main body fitting portion 651. Is done.
Further, the relative position between the primary light emitting part 21a and the light conversion member 43 in the tilt direction is controlled so that the eye safe is ensured by fitting the main body part 471 to the main body fitting part 651.

  As shown in FIG. 2C, by controlling the relative positions in the radial direction and the inclination direction, the central axis of the primary light emitting portion 21a, the central axis of the primary light incident portion 41, and the primary light incident portion. The central axis of the rear surface 43 a including 41 is arranged coaxially with each other, and these central axes are arranged on the optical axis 11. The light transmitting member 47 is fixed by an adhesive 48.

  As a result, the primary light emitting portion 21a is optically connected to the primary light incident portion 41 stably and with high accuracy. Desired optical characteristics are always obtained, variations in optical characteristics are suppressed, and variations in quality of the optical device 10 are reduced when the optical device 10 is mass-produced.

[effect]
Thus, in the present embodiment, the primary light emitting unit 21a, the primary light incident unit 41, and the light are controlled by the position control unit 80 including the optical axis direction control unit 81, the radial direction control unit 83, and the tilt direction control unit 85. When the conversion member 43 is positioned stably and with high accuracy, the quality variation of the optical device 10 can be reduced when the optical device is mass-produced, and desired optical characteristics can be obtained in the optical device 10.

  In the present embodiment, the relative position in the direction of the optical axis 11 can be controlled as desired by the light transmitting member 47 that functions as the optical axis direction control member of the optical axis direction control means 81. In the present embodiment, since the light transmitting member 47 is interposed between the primary light emitting portion 21a and the light conversion member 43 in the direction of the optical axis 11, the relative position in the direction of the optical axis 11 can be reliably controlled. .

  In this embodiment, the eye-safe can be secured by the length L1 of the light transmission member 47 in the direction of the optical axis 11, and when the light conversion member 43 generates secondary light, the light conversion member 43 is deteriorated by a large amount of heat generation. Can be prevented.

  In the present embodiment, the primary light emitting portion 21 a, the light guide fitting portion 61, the main body portion 471, and the main body fitting portion 651 functioning as the radial direction control means 83 and the inclination direction control means 85, and the radial direction and the inclination. The relative position in the direction can be controlled as desired. In particular, in the present embodiment, the primary light emitting portion 21a is fitted with the light guide fitting portion 61, and the main body portion 471 is fitted with the main body fitting portion 651, so that the relative positions in the radial direction and the inclined direction are changed. Can be positioned.

  Further, in the present embodiment, the relative positions in the radial direction and the inclination direction are stably and highly accurately determined by the main body portion 471 and the insertion portion 473, the main body fitting portion 651, and the insertion housing portion 653 of the light transmitting member 47. Can be positioned.

  In the present embodiment, the cylindrical main body 471 and the cylindrical main body fitting portion 651 can position the relative positions in the radial direction and the inclination direction more stably and with high accuracy.

  In the present embodiment, the main body portion 471, the insertion portion 473, and the main body fitting portion 651 are smaller than the insertion portion 473, and the taper angle θ1 is larger than the taper angle θ2. Thereby, in this embodiment, when the main body portion 471 advances to the main body fitting portion 651, the tapered outer peripheral surface 473c of the insertion portion 473 is prevented from sliding on the tapered inner peripheral surface of the insertion accommodating portion 653. It is possible to prevent the outer peripheral surface 473c and the inner peripheral surface from wearing each other.

  In the present embodiment, the secondary light can be reflected toward the secondary light emitting portion 45 by the reflecting member 67, and the light utilization efficiency can be improved.

  In the present embodiment, the central axis of the light conversion member 43 can be easily disposed on the central axis of the light transmitting member 47 by the engaging recess 47 d.

  The adhesive 48 may be applied after the light transmitting member 47 is accommodated in the accommodating portion 65.

[Modification]
As shown in FIG. 3, in the present modification, the holding unit 60 is divided into a plurality, an adapter unit 601 to which the optical fiber 21 is fixed, a light guide holding unit 603 having a light guide fitting unit 61, Positioning and fixing the light guide holding portion 603 and the housing holding portion 605 so that the housing holding portion 605 having the housing portion 65, the primary light emitting portion 21a and the primary light incident portion 41 are optically connected to each other. And a caulking portion 607.

[Adapter unit 601]
The adapter unit 601 includes a press-fitting hole 601 a into which the end of the light guide holding unit 603 is press-fitted, an insertion hole 601 b through which the optical fiber 21 including the coating layer 23 is inserted, and a guide port similar to the guide port 63. 601c. An adhesive member 63a that fixes the optical fiber 21 including the coating layer 23 to the adapter unit 601 is disposed in the insertion hole 601b including the guide port 601c.

[Light guide holding portion 603]
The light guide holding part 603 is press-fitted into the caulking part 607.

  In the light guide holding part 603, the optical fiber 21 is fitted into the light guide fitting part 61, whereby the light guide holding part 603 holds the optical fiber 21. At this time, the end face of the light guide holding part 603 is disposed on the same plane as the primary light emitting part 21a, the end face and the primary light emitting part 21a are formed as a plane orthogonal to the optical axis 11, and the end face The end surface of the light guide holding part 603 is polished together with the primary light emitting part 21a so that both the primary light emitting part 21a and the primary light emitting part 21a are smooth.

[Accommodating and holding unit 605]
The accommodation holding portion 605 is formed in a stepped shape, and thus has, for example, a convex outer shape. Such an accommodation holding | maintenance part 605 is comprised from the one end part 605a and the one end part 605a, and the other end part 605b larger (thick) than the one end part 605a. The one end 605a and the other end 605b have, for example, a cylindrical shape. In this case, the one end portion 605a is formed as a small diameter portion, and the other end portion 605b is formed as a large diameter portion.

  The main body fitting portion 651 is disposed at one end 605a, and the insertion housing portion 653 is disposed at one end 605a and the other end 605b.

  One end 605 a is press-fitted into the caulking portion 607, and the other end 605 b is disposed outside the caulking portion 607. The diameter of the one end portion 605a is substantially the same as the diameter of the light guide holding portion 603.

  Further, in the housing and holding part 605, the housing and holding part 605 holds the light transmitting member 47 by fitting the main body part 471 with the main body fitting part 651. At this time, the end surface of the one end portion 605a of the housing holding portion 605 is disposed on the same plane as the rear surface 47a including the primary light incident portion 41, and the end surface and the rear surface 47a including the primary light incident portion 41 are the optical axis 11. The end surface of the one end portion 605a of the housing holding portion 605 includes the primary light incident portion 41 so that the end surface and the rear surface 47a including the primary light incident portion 41 are both smooth. Polished together with the rear surface 47a.

[Caulking part 607]
The caulking portion 607 is formed of, for example, a spring material such as zirconia, nickel, or phosphor bronze, and has an elastic force for elastic deformation.

  The end portion of the light guide holding portion 603 and the one end portion 605a of the housing holding portion 605 are the end surface of the one end portion 605a of the housing holding portion 605 where the end surface of the light guide holding portion 603 including the primary light emitting portion 21a includes the rear surface 47a. The primary light emitting portion 21a is press-fitted into the caulking portion 607 and fitted into the caulking portion 607 so that the primary light emitting portion 21a is in optical contact with the primary light incident portion 41.

  Thus, the caulking portion 607 is both a positioning member and a connecting member. The caulking portion 607 is formed so that a part of the cross section of the caulking portion 607 is cut out. Further, the caulking portion 607 is a part of a cross section of the caulking portion 607 in order to weaken the force that the caulking portion 607 clamps the end portion of the light guide holding portion 603 and the one end portion 605a of the housing holding portion 605 in the radial direction during press-fitting. Is formed so as to be cut out. For this reason, for example, the caulking portion 607 is formed as a substantially cylindrical member having a cross-section partially cut away in the axial direction. This cross section is formed in a plane direction orthogonal to the axial direction of the caulking portion 607. Moreover, this cross section is formed in C shape, for example. For this reason, the caulking portion 607 is formed, for example, as a substantially cylindrical shape having a C-shaped cross section continuously in the axial direction. Such a caulking portion 607 is a split sleeve in which a part of a circle is notched. Therefore, the caulking portion 607 has a slit portion (not shown) that is disposed along the axial direction of the caulking portion 607 and penetrates the caulking portion 607 in the axial direction. The slit portion penetrates the caulking portion 607 in the thickness direction of the caulking portion 607.

  A refractive index matching member (not shown) is disposed between the primary light emitting portion 21a and the primary light incident portion 41 in the direction of the optical axis 11. The refractive index matching member is arranged to prevent the optical coupling efficiency from being lowered due to air entering between the primary light emitting part 21a and the primary light incident part 41 in the direction of the optical axis 11 and on the optical path. It is installed. The refractive index of the refractive index matching member approximates the refractive index of the optical fiber 21 and the refractive index of the light transmitting member 47. The refractive index matching member is a liquid such as matching oil or a solid such as silicone resin.

[effect]
As described above, in this modified example, the number of parts is increased, but the light guide holding unit 603, the housing holding unit 605, and the caulking unit 607 have high dimensional accuracy, so that the radial direction is more stable and more accurate. The relative position in the tilt direction can be determined.

  In this modification, the number of parts increases, but each can be processed easily and with high accuracy, the cost per part can be reduced, and the parts can be easily assembled.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Optical device, 11 ... Optical axis, 20 ... Light guide unit, 21 ... Optical fiber, 21a ... Primary light emission part, 40 ... Illumination unit, 41 ... Primary light incident part, 43 ... Light conversion member, 45 ... Primary light emitting part, 47 ... light transmission member, 60 ... holding part, 61 ... light guide fitting part, 65 ... control fitting part, 80 ... position control means, 81 ... optical axis direction control means, 83 ... radial direction Control means, 85: Inclination direction control means, 85: Inclination direction position control means, 471 ... Main body part, 473 ... Insertion part, 651 ... Main body fitting part, 653 ... Insertion housing part

Claims (18)

A light guide unit that has an emission part that emits primary light and guides the primary light;
An incident portion that is guided by the light guide unit and is incident on the primary light emitted from the emission portion; and an incident portion that is disposed apart from the incident portion and that is incident on the incident portion. A generation unit that generates secondary light different from the primary light by being irradiated, and illuminates an observation object as illumination light with the secondary light; and
A holding unit that holds the light guide unit and the illumination unit so that the emitting unit and the incident unit are optically connected to each other;
Position control means for controlling the relative position between the emitting portion and the generating member;
Comprising
The central axis direction of the light emitted from the emission part is referred to as an optical axis direction,
The direction perpendicular to the optical axis direction is referred to as the radial direction,
The direction inclined in the optical axis direction is referred to as the inclination direction,
The position control means includes
Optical axis direction control means for controlling the relative position in the optical axis direction;
Radial control means for controlling the relative position in the radial direction;
A tilt direction control means for controlling the relative position in the tilt direction;
An optical device comprising:   The optical axis direction control means is disposed between the incident portion and the generating member in the optical axis direction so as to have the incident portion, and controls the relative position in the optical axis direction as desired. The optical device according to claim 1, further comprising an optical axis direction control member.   The optical axis direction control member is optically connected to the emitting portion and the generating member in the optical axis direction and is sandwiched between the emitting portion and the generating member in the optical axis direction. The optical device according to claim 2, wherein the optical device is interposed between the optical member and the generation member.   When the primary light emitted from the emission part irradiates the generation member, in the optical axis direction, the optical axis direction control member has at least a high intensity component of the primary light entering the generation member. 4. The optical device according to claim 3, wherein the optical device has a length L1.   When the primary light is emitted from the emission part at a desired spread angle and irradiates the generation member, the optical axis direction control member in the optical axis direction is an intensity of the primary light in the generation member. The optical device according to claim 3, wherein the optical device has a length L1 such that the distribution does not exceed a heat resistant temperature of the generating member when generating the secondary light.   The optical device according to claim 4, wherein the optical axis direction control member includes glass. The radial direction control means and the tilt direction control means are:
The emitting portion of the light guide unit;
A light guide fitting portion disposed in the holding portion, at least to which the emission portion of the light guide unit is fitted;
A part of the optical axis direction control member;
An accommodating portion having a main body fitting portion disposed in the holding portion and into which the part of the optical axis direction control member is fitted;
Have
The light guide fitting portion, the accommodating portion, the emitting portion, the incident portion, and the optical axis direction control member are coaxially arranged so that the emitting portion and the incident portion are optically connected to each other. The optical device according to claim 2, wherein the optical device is provided.   When the part of the optical axis direction control member is fitted to the body fitting portion, the radial direction control means positions the relative position in the radial direction, and the tilt direction control means is in the tilt direction. The optical device according to claim 7, wherein the relative position is positioned. The main body fitting portion is disposed in a part of the housing portion,
The accommodating portion is disposed in the other portion of the accommodating portion, and further includes an insertion accommodating portion communicating with the main body fitting portion in the optical axis direction.
The optical axis direction control member is
A main body portion having the incident portion, disposed in the part of the optical axis direction control member, and fitted into the main body fitting portion;
It is integrated with the main body so as to be disposed coaxially with the main body, and is disposed on the other part of the optical axis direction control member so as to be optically connected to the generating member, An insertion part to be inserted into the insertion housing part;
The optical device according to claim 8, comprising: The main body has a cylindrical shape,
The optical device according to claim 9, wherein the insertion portion has a truncated cone shape whose diameter increases from the main body portion toward the generation member in the optical axis direction. The body fitting portion communicates with the light guide fitting portion and is smaller than the insertion portion,
The optical device according to claim 10, wherein the insertion housing portion is larger than the insertion portion. The body fitting portion has a cylindrical shape,
The insertion housing portion has a truncated cone shape whose diameter increases from a distal end portion of the housing portion where the main body fitting portion is disposed to a proximal end portion of the housing portion in the optical axis direction. The optical device according to claim 11.   The optical device according to claim 12, wherein the housing portion is provided on an inner peripheral surface of the insertion housing portion and includes a reflecting member that reflects the secondary light. The optical axis direction control member is disposed in the insertion portion, and has an engagement recess with which the generation member is engaged.
The central axis of the engaging recess is disposed on the central axis of the optical axis direction control member such that the central axis of the generating member is disposed on the central axis of the optical axis direction control member. The optical device according to claim 13.   When the optical axis direction control member is inserted into the housing portion, the cylindrical main body portion has a cylindrical shape of the housing portion so that the central axis of the generating member is disposed on the optical axis. The optical device according to claim 14, wherein the optical device is fitted with the main body fitting.   The optical device according to claim 15, wherein a diameter of the main body is larger than a diameter of the emitting portion and smaller than a diameter of the generating member. In the frustoconical insertion portion, and the frustoconical insertion receiving portion that is larger than the insertion portion and into which the insertion portion is inserted,
The taper angle θ1 of the insertion housing portion is larger than the taper angle θ2 of the insertion portion so that a gap is formed between the inner circumferential surface of the insertion housing portion and the outer circumferential surface of the insertion portion. The optical device according to claim 15.   The generation member is obtained by mixing a light distribution conversion member that converts light distribution of primary light, a wavelength conversion member that converts the wavelength of primary light, and the light distribution conversion member and the wavelength conversion member. The optical system according to claim 7, comprising at least one of a mixture to be molded, and a laminate formed by laminating one of the light distribution conversion member and the wavelength conversion member on the other. device.

Images