JP2018141954A - Optical connection member and optical connector - Google Patents

Abstract

An optical connection member and an optical connector that can easily position an end face of a glass optical fiber and a collimator lens without damaging the glass optical fiber while suppressing an increase in cost. A holder 11 having a cylindrical shape, a collimator lens 12 accommodated in an accommodating portion 11c formed at one end of the holder, and an insertion hole 11a formed at the other end of the holder are inserted into an optical fiber 13. An end face of the optical fiber by bringing the collimator lens and / or the adapter into contact with the contact surface formed by providing the recess 11e on the outer periphery in the vicinity of the holder accommodating portion. And the collimator lens. [Selection] Figure 3

Description

  The present invention relates to an optical connection member and an optical connector that are used when light from a light emitting element is condensed and incident on an optical fiber, or light emitted from the optical fiber is condensed on a light receiving element.

  The optical collimator included in the optical connecting member propagates the light emitted from the light source in the optical fiber and emits it in the air as necessary, or enters the light propagating in the air into the optical fiber. used. In such an optical collimator, it is necessary to position the end face of the optical fiber and the collimator lens with high accuracy in order to ensure the light propagation efficiency. Conventionally, there has been proposed an optical collimator that easily positions an optical fiber and a collimator lens while suppressing an increase in cost associated with manufacturing and processing (see, for example, Patent Document 1).

  In the optical collimator described in Patent Document 1, a cylindrical holding member, a collimator lens housed in a housing part formed at one end of the holding member, and an insertion hole formed at the other end of the holding member are inserted. And positioning the optical fiber by bringing the end face of the optical fiber and the collimator lens into contact with a depression formed in the vicinity of the holding portion of the holding member. Since the optical fiber and the collimator lens are positioned with reference to the depressed portion, it is possible to easily position the optical fiber and the collimator lens while suppressing an increase in cost.

JP 2011-227201 A

  By the way, as an optical fiber, a glass optical fiber (GOF: Glass Optical Fiber) and a plastic optical fiber (POF: Plastic Optical Fiber) are widely used. In general, GOF has a smaller core diameter and is less susceptible to bending than POF, but has low transmission loss and is suitable for long-distance high-speed transmission. Conversely, POF has a thicker core diameter and stronger bending than GOF, but has a large transmission loss and is not suitable for long-distance high-speed transmission. These optical fibers are properly used depending on the application.

  The outer diameter of the clad covering the core of a general GOF is set to 125 μm. In the optical collimator, it is required to position the end face of the small-diameter GOF and the collimator lens without requiring complicated work. In addition, the optical collimator is also required to suppress an increase in cost associated with manufacturing and processing.

  The present invention has been made in view of such circumstances, and an optical connection member and an optical connector that can easily position an end face of a small-diameter optical fiber and a lens while suppressing an increase in cost. The purpose is to provide.

  The optical connection member of the present invention is inserted through a holding member having a cylindrical shape, a lens housed in a housing part formed at one end of the holding member, and an insertion hole formed at the other end of the holding member, An adapter for holding one end of the optical fiber, and at least the adapter of the lens and the adapter is applied to an abutment surface formed by providing a depression on the outer periphery in the vicinity of the holding portion of the holding member. The end face of the optical fiber and the lens are positioned in contact with each other.

  According to the optical connection member, since the adapter or the like that holds one end of the optical fiber is brought into contact with the depressed portion (contact surface) formed in the holding member, the end face of the optical fiber and the lens are positioned. The small-diameter optical fiber and the lens can be positioned with reference to the depressed portion. For this reason, it becomes possible to easily position the end face of the small-diameter optical fiber and the lens while suppressing an increase in cost as compared with the case where a configuration for positioning is provided by cutting or the like.

  In the optical connection member, it is preferable that the adapter holds the optical fiber such that a part of the end face of the optical fiber is arranged on the same plane as an end face on the front side in the insertion direction with respect to the holding member. . According to this configuration, since the end face of a part of the optical fiber and the end face on the front side in the insertion direction of the adapter are arranged on the same plane, positioning is performed with reference to the end face on the front side in the insertion direction of the adapter. Since this can be done, the end face of the optical fiber and the lens can be positioned more easily.

  In the optical connection member, it is preferable that the adapter has an end face on the rear side in the insertion direction with respect to the holding member is bonded and fixed to a covering member included in the optical fiber. According to this configuration, since the end face on the rear side in the insertion direction of the adapter is bonded and fixed to the covering member of the optical fiber, it is possible to perform the positioning operation of the optical fiber and the lens in an integrated state with the adapter. Become.

  Furthermore, in the optical connection member, it is preferable that an end surface on the rear side in the insertion direction with respect to the holding member is accommodated inside the holding member while the adapter is in contact with the contact surface. According to this configuration, since the end face on the rear side in the insertion direction of the adapter is housed inside the holding member, the dimensions of the adapter can be reduced, so that the material cost of the adapter can be reduced. In addition, since the connection portion between the adapter and the optical fiber can be protected by the holding member, it is possible to prevent an external impact from being applied to the connection portion.

  In the optical connection member, the adapter may be arranged such that an end surface on the rear side in the insertion direction with respect to the holding member is disposed outside the holding member in a state of being in contact with the contact surface. . According to this configuration, since the end face on the rear side in the insertion direction of the adapter is arranged outside the holding member, it is possible to perform work by grasping a part of the adapter arranged outside the holding member at the time of positioning. Therefore, it is possible to improve the efficiency of positioning work.

  Moreover, the said optical connection member WHEREIN: It is preferable that the said adapter has a small diameter part smaller diameter than a rear side part in a part of the front side of the insertion direction with respect to the said holding member. According to this configuration, since the small-diameter portion is provided on the front side in the insertion direction with respect to the holding member, even when the inner peripheral portion is deformed inward around the contact surface when the recessed portion is provided in the holding member. The adapter can be inserted without being affected by the deformed portion. Thereby, the end surface of the front side of the adapter can be properly brought into contact with the contact surface, and the optical fiber can be accurately positioned.

  Further, in the optical connection member, the holding member has a depression for fixing that presses and fixes the adapter or the optical fiber covering member inserted from the insertion hole in the vicinity of the end on the insertion hole side. It is preferable that a part is formed. According to this configuration, the adapter or the optical fiber covering member is pressed and fixed by the fixing depression, so that no special configuration is required for fixing the optical fiber, and the holding member can be easily configured. Thus, the optical fiber can be fixed.

  Further, in the optical connection member, the angle of the contact surface facing the adapter and the angle of the contact surface facing the lens are different from each other with respect to a plane orthogonal to the insertion direction of the adapter. It is preferable to do. Thus, by setting the angle of the portion facing the lens in the depression and the angle of the portion facing the adapter to be different, it is possible to effectively position the lens and the adapter having different shapes.

  For example, in the optical connection member, the abutting surface facing the adapter is an inclined surface, the angle of the inclined surface with respect to a plane orthogonal to the insertion direction of the adapter is 20 ° or less, and one end surface of the adapter The portion can be brought into contact with the contact surface. Thus, by setting the angle of the contact surface facing the adapter to 20 ° or less with respect to the plane orthogonal to the insertion direction of the adapter, the end surface on the front side in the insertion direction in the adapter holding the optical fiber in the center portion It is possible to make it easy to ensure the positional accuracy of these by bringing them into contact with the contact surface.

  In the optical connecting member, the contact surface facing the lens is an inclined surface, and the angle of the inclined surface with respect to a plane orthogonal to the insertion direction of the adapter is 0 ° or more and 45 ° or less. A part can be brought into contact with the inclined surface. In this case, since it can position in the state which supported a part by the side of the adapter in a lens, it becomes possible to raise the positional accuracy of a lens.

  For example, in the optical connection member, the optical fiber is a glass optical fiber, and the adapter holds at least a core and a clad included in the glass optical fiber. In this case, the glass optical fiber can prevent the core and the clad from being damaged during the positioning operation because the adapter and the core sensitive to the shock are held by the adapter.

  An optical connector according to the present invention includes any one of the above optical connection members. According to the optical connector of the present invention, the effect obtained by the above-described optical connection member can be enjoyed by the optical connector.

  According to the present invention, it is possible to easily position an end face of a small-diameter optical fiber and a lens while suppressing an increase in cost.

It is a sectional side view showing typically the optical connector to which the optical connection member concerning the present invention is connected. It is a side view of the optical collimator concerning a 1st embodiment. It is sectional drawing in AA shown in FIG. It is sectional drawing of the optical collimator at the time of inserting a plastic optical fiber. FIG. 4 is an enlarged view within a two-dot chain line B shown in FIG. 3. It is sectional drawing of the optical collimator which concerns on 2nd Embodiment. It is sectional drawing of the optical collimator which concerns on 3rd Embodiment.

  Hereinafter, a plurality of embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, about the optical connection member which concerns on this invention, it is not limited to embodiment shown below, It can implement in various deformation | transformation within the range of the meaning of the invention. In the following, an optical collimator will be used as an example of the optical connection member according to the present invention. However, the application target of the optical connection member according to the present invention is not limited to the optical collimator, and can be appropriately changed.

  First, an optical connector to which an optical collimator according to the present invention is connected will be described. FIG. 1 is a side sectional view schematically showing an optical connector to which an optical collimator according to the present invention is connected. In FIG. 1, for convenience of explanation, a semiconductor laser chip and an optical connector provided with an optical lens on the optical axis of the semiconductor laser chip will be described as a light source emitted to the optical collimator. It is not limited to these, and can be changed as appropriate.

  As shown in FIG. 1, in an optical connector 100 to which an optical collimator according to the present invention is connected, a semiconductor laser chip 101 is disposed on a mount base 103 of a case 102 and optically on the optical axis of the semiconductor laser chip 101. A semiconductor laser unit 105 having a lens 104 is provided. The optical connector 100 further includes a support member 108 that supports the holder 11 of the optical collimator 10 that has the opening 106 attached to the side surface 102 a of the case 102 and is inserted from the insertion port 107.

  In the semiconductor laser unit 105, laser light emitted from the semiconductor laser chip 101 is converted into parallel light by the optical lens 104 and guided to the opening 106. The parallel light from the optical lens 104 is collected by the collimator lens 12 of the optical collimator 10 and is incident on the optical fiber 13. The incident light is propagated through the optical fiber 13.

  In the optical connector 100 according to the present embodiment, when the optical collimator 10 is inserted to a predetermined position of the support member 108, the optical lens 104 and the collimator lens 12 are aligned, and the laser from the semiconductor laser chip 101 is detected. It is designed so that light can enter the optical fiber 13 appropriately. Hereinafter, the configuration of the optical collimator 10 according to the present embodiment connected to such an optical connector 100 will be described.

(First embodiment)
FIG. 2 is a side view of the optical collimator 10 according to the first embodiment of the present invention. 3 is a cross-sectional view taken along line AA shown in FIG. 2 and 3 show a case where a glass optical fiber (hereinafter referred to as “GOF: Glass Optical Fiber”) is inserted as an example of a small-diameter optical fiber.

  The optical collimator 10 according to the first embodiment selectively holds a general plastic optical fiber (hereinafter referred to as “POF: Plastic Optical Fiber”) and a GOF having a smaller diameter than the POF. Configured to be possible. As will be described in detail later, in the optical collimator 10 according to the present embodiment, the GOF is held in the optical collimator 10 via the adapter 14 (see FIG. 3), while the POF is optically transmitted without the adapter 14 interposed. It is held by the collimator 10.

  As shown in FIGS. 2 and 3, the optical collimator 10 according to the first embodiment includes a holder 11 as a holding member having a generally cylindrical shape, and one end of the holder 11 (shown in FIGS. 2 and 3). The collimator lens 12 as a lens held at the left side end) and the insertion hole 11a provided at the other end of the holder 11 (the right side end shown in FIGS. 2 and 3) is inserted into the GOF 13 And an adapter 14 that holds a part of the adapter 14.

  The holder 11 is formed of a metal material such as a nickel alloy or stainless steel, for example. When stainless steel is used, the holder 11 is preferably formed of austenitic stainless steel, particularly from the viewpoint of workability. As shown in FIG. 3, an opening 11b is provided at the end of the holder 11 on the collimator lens 12 side. A housing portion 11c for housing the collimator lens 12 is provided inside the opening portion 11b. The accommodating portion 11c is provided with a size slightly smaller than the diameter of the collimator lens 12, and is configured such that the collimator lens 12 can be press-fitted.

  In order to prevent damage to the surface of the collimator lens 12, the accommodating portion 11c is provided with a size that allows the entire collimator lens 12 to be accommodated therein. In addition, a through hole 11d having a diameter slightly larger than the outer diameter of the adapter 14 or a POF 15 (see FIG. 5) described later is provided inside the holder 11. The through hole 11d communicates with the insertion hole 11a and is also communicated with the accommodating portion 11c.

  The holder 11 is provided with a plurality of (three in this embodiment) depressed portions 11e formed by pressing from the outer peripheral portion with a tool or the like. These depressed portions 11e are provided between the accommodating portion 11c and the through hole 11d, and are used for positioning the collimator lens 12 and the adapter 14 (or POF 15) as will be described in detail later.

  Furthermore, the holder 11 is provided with a plurality (four in this embodiment) of recessed portions 11f formed by pressing from the outer peripheral portion with a tool or the like. These depressed portions 11 f are provided in the vicinity of the insertion hole 11 a and are used for fixing the GOF 13 (or POF 15) inserted into the holder 11.

  The collimator lens 12 is made of, for example, an optical glass material containing quartz, and is composed of a ball lens having a spherical shape. The collimator lens 12 may be made of an optical plastic material. As shown in FIG. 3, the collimator lens 12 faces the opening portion 106 of the support member 108 from the opening portion 11 b while being accommodated in the housing portion 11 c of the holder 11, while being inserted into the through hole 11 d. It arrange | positions so that it may face the front-end | tip part (front-end surface 141 mentioned later) (refer FIG. 1). In this embodiment, the case where a collimator lens is provided as a lens is described. However, the lens configuration is not limited to the collimator lens 12 and may be a lens that does not have a collimating function. . Further, the shape of the lens may be a shape other than the ball lens (for example, an aspheric lens).

  The adapter 14 is made of, for example, a metal material such as a nickel alloy or stainless steel, or a ceramic material such as zirconia. In particular, the adapter 14 is preferably formed of a metal material from the viewpoint of processing accuracy and manufacturing cost, and from the viewpoint of fixing with a holder 11 described later (see FIG. 6). As shown in FIG. 3, the adapter 14 has a generally cylindrical shape. The outer diameter of the adapter 14 is slightly smaller than the inner diameter of the through hole 11 d of the holder 11. The adapter 14 is inserted into the through hole 11 d from the insertion hole 11 a of the holder 11. The adapter 14 has a front end surface 141 and a rear end surface 142 parallel to a plane orthogonal to the insertion direction on the front side and the rear side in the insertion direction with respect to the holder 11.

  A through hole 143 that penetrates from the front end surface 141 to the rear end surface 142 is formed at the center of the adapter 14. The through hole 143 is provided with a diameter slightly larger than the outer diameter of the core 13a of the GOF 13 described later. The dimension from the front end surface 141 to the rear end surface 142 is configured to be shorter than the through hole 11 d of the holder 11. For this reason, the adapter 14 has the rear end surface 142 accommodated inside the holder 11 in a state where the front end surface 141 is in contact with the contact surface formed on the inner wall of the holder 11 by providing a depressed portion 11e described later. .

  The GOF 13 reinforces the core 13a provided through the center thereof, the clad 13b covering the core 13a, the ultraviolet curable resin layer 13c covering the clad 13b, and the ultraviolet curable resin layer 13c. It is comprised from the reinforcement layer 13d. The core 13a is made of, for example, quartz glass and has an outer diameter of 50 or 62.5 μm. The clad 13b has an outer diameter of 125 μm with the core 13a covered. The ultraviolet curable resin layer 13c has an outer diameter of 250 μm when coated on the clad 13b. By coating the ultraviolet curable resin 13c, the core 13a and the clad 13b are configured to be resistant to bending. The reinforcing layer 13d is made of, for example, an acrylic resin. The reinforcing layer 13 d preferably has an outer diameter that is substantially the same as the outer diameter of the adapter 14. However, the diameter may be smaller or larger than the outer diameter of the adapter 14 on the assumption that the inner core 13a and the clad 13b are protected.

  In addition, the UVF resin layer 13 c and the reinforcing layer 13 d are removed from the GOF 13, and the core 13 a and the clad 13 b are inserted into the through hole 143 of the adapter 14. The GOF 13 is bonded and fixed to the rear end surface 142 at the end surfaces of the ultraviolet curable resin layer 13 c and the reinforcing layer 13 d facing the rear end surface 142 of the adapter 14. The front end surface 131 in the insertion direction of the adapter 14 in the GOF 13 (the core 13 a and the clad 13 b) is disposed on the same plane as the front end surface 141 of the adapter 14. In other words, the adapter 14 holds the GOF 13 so that the end surfaces 131 of the core 13a and the clad 13b are arranged on the same plane as the front end surface 141.

  Further, the GOF 13 is inserted into the through hole 11d through the insertion hole 11a with the adapter 13 holding the core 13a and the clad 13b, so that the tip thereof faces the spherical surface in the vicinity of the collimator lens 12. Fixed in place. In the optical collimator 10 according to the first embodiment, after the adapter 14 is aligned, a recessed portion 11f is provided in a part of the holder 11 in that state, and the reinforcing layer of the GOF 13 is formed on the inner surface of the recessed portion 11f. 13d is clamped and fixed.

  The fixing of the GOF 13 to the holder 11 is not limited to this, and any fixing method can be applied. For example, the GOF 13 may be fixed to the holder 11 with an adhesive applied between the inner peripheral surface of the through hole 11d. When the holder 11 is fixed by the adhesive applied to the inner peripheral surface of the through hole 11d, the above-described depressed portion 11f is not necessarily provided.

  FIG. 4 is a cross-sectional view of the optical collimator 10 when a POF 15 is inserted as an optical fiber. 4 shows a cross-section corresponding to AA shown in FIG. 2, as in FIG. The POF 15 shown in FIG. 4 includes a core 15a provided through the center thereof, a clad 15b that covers the core 15a, and a reinforcing layer 15c that covers and reinforces the clad 15b. On the end face of the POF 15 facing the collimator lens 12, the core 15a, the clad 15b and the reinforcing layer 15c are arranged on the same plane. That is, the core 15a, the clad 15b, and the reinforcing layer 15c are arranged on the end face facing the collimator lens 12. The outer diameter of the reinforcing layer 15 c has substantially the same dimension as the outer diameter of the adapter 14.

  The POF 15 is inserted into the through-hole 11d through the insertion hole 11a, and is fixed in a state where the tip end portion thereof is disposed in the vicinity of the collimator lens 12 so as to face the spherical surface. In this case, the POF 15 is fixed by sandwiching the reinforcing layer 15c of the POF 15 on the inner surface of the depressed portion 11f provided in the vicinity of the insertion hole 11a of the holder 11 as in the case of the GOF 13. The fixing of the POF 15 to the holder 11 is not limited to this, and any fixing method can be applied. For example, the POF 15 may be fixed to the holder 11 with an adhesive applied between the inner peripheral surface of the through hole 11d.

  For example, the POF 15 is composed of a graded index (GI) optical fiber, and is configured such that the refractive index continuously changes in a cross section perpendicular to the fiber axis. The core 15a and the clad 15b are made of, for example, an all-fluorine-substituted optical resin in which H of C—H bond is substituted with F. As described above, the POF 15 is made of a perfluorinated optical resin and is made of a GI type optical fiber, whereby high speed and large capacity communication can be realized.

  In this manner, the optical collimator 10 according to the first embodiment has a configuration capable of selectively holding the GOF 13 or the POF 15, and suppresses an increase in cost when the GOF 13 is inserted into the holder 11. In order to easily position the end face 131 of the GOF 13 (the front end face 131 of the core 13a and the clad 13b) and the collimator lens 12, the depressed portion 11e provided in the holder 11 is used. Specifically, by positioning the collimator lens 12 and a part of the adapter 14 in contact with the contact surface formed by providing the depressed portion 11e in the holder 11, the positioning spacers or the like By eliminating the configuration, it is possible to easily position the collimator lens 12 and the end face 131 of the GOF 13 while suppressing an increase in cost.

  Here, a method of positioning the collimator lens 12 and the adapter 14 in the holder 11 of the optical collimator 10 according to the first embodiment will be described with reference to FIG. FIG. 5 is an enlarged view inside the two-dot chain line B shown in FIG. As shown in FIG. 5, a part of the collimator lens 12 abuts on a portion of the inner surface of the depressed portion 11 e facing the collimator lens 12. On the other hand, a part of the front end surface 141 of the adapter 14 comes into contact with a portion facing the adapter 14. The collimator lens 12 and the end surface of the GOF 13 (the front end surface 13a1 of the core 13a) are respectively positioned at predetermined positions of the holder 11 in such a state of contact.

  As shown in FIG. 5, the depressed portion 11 e is perpendicular to the insertion direction of the GOF 13 (for example, a plane C that is arranged in parallel with the end surface of the GOF 13 shown in FIG. 5 and passes through the center of the depressed portion 11 e). The angle of the portion facing the collimator lens 12 is different from the angle of the portion facing the GOF 13. Such a depressed portion 11e is provided by, for example, pressing using a tapered tool having a different tip shape. By pressing with such a tool, the depression 11e is provided with an asymmetric shape between the shape of the portion facing the collimator lens 12 and the shape of the portion facing the GOF 13 with reference to the central axis at the time of the pressing. It will be. As described above, the collimator lens 12 and the GOF 13 having different shapes can be effectively positioned by setting the angle of the portion facing the collimator lens 12 in the depressed portion 11e and the angle of the portion facing the GOF 13 to be different. Can do.

  Further, in the optical collimator 10 according to the first embodiment, a plurality (three in the present embodiment) of such depressed portions 11 e are provided on the same circumference of the holder 11. The formation of the depressed portion 11e on the same circumference can be considered, for example, by simultaneously pressing the outer circumference of the holder 11 with the tool having the different tip shape described above. By providing the plurality of depressions 11e on the same circumference in this way, the collimator lens 12 and the GOF 13 can be brought into contact with each other at a plurality of positions, so that the collimator lens 12 and the GOF 13 can be positioned with higher accuracy. it can.

Portion facing the collimator lens 12 in the recess 11e constitutes the inclined surface 11e ₁ is a contact surface. The inclined surface 11e ₁ is a plane perpendicular to the insertion direction of the adapter 14 indicated by an arrow in FIG. 5 (for example, parallel to the front end surface 141 of the adapter 14 shown in FIG. 5 and passes through the base end of the depressed portion 11e. angle theta ₁ with respect to the plane D) which is provided so as to be 0 ° to 45 °. In this way, by setting the angle θ ₁ of the inclined surface 11e ₁ on the collimator lens 12 side to 0 ° or more and 45 ° or less with respect to the plane D orthogonal to the insertion direction of the adapter 14, _one of the collimator lens 12 on the GOF 13 side is set. Since it can position in the state which supported the part, the positional accuracy of the collimator lens 12 can be improved.

  Further, the surface of the portion of the depressed portion 11e facing the collimator lens 12 is subjected to cutting processing, press (pressing) processing, grinding processing, and removal processing by energy beam processing, so that the contact surface with the collimator lens 12 is provided. Forming. Thus, the contact surface with the collimator lens 12 is formed by performing removal processing on the surface of the depressed portion 11 e facing the collimator lens 12. Thereby, since the contact surface of the collimator lens 12 in the depression 11e can be smoothed, damage to the collimator lens 12 can be prevented, and the position accuracy of the collimator lens 12 can be further increased. It has become.

Meanwhile, the portion facing the adapter 14 in the recess 11e constitutes the inclined surface 11e ₂ is a contact surface. The inclined surface 11e ₂ is provided such that an angle θ ₂ with respect to a plane orthogonal to the insertion direction of the GOF 13 (for example, a plane E arranged parallel to the end surface of the adapter 14 shown in FIG. 5) is 20 ° or less. . Thus, by providing the angle of the inclined surface 11e ₂ at 20 ° or less with respect to the plane E, the front end surface 141 of the adapter 14 holding the core 13a of the GOF 13 at the center is brought into contact with the inclined surface 11e _2. Thus, it is possible to easily ensure the positional accuracy of these.

Here, an assembling method of the optical collimator 10 according to the first embodiment will be described with reference to FIG. First, the collimator lens 12 is press-fitted into the accommodating portion 11c of the holder 11 provided with the depressed portion 11e. The collimator lens 12 is pushed in until it comes into contact with the inclined surface 11e ₁ (see FIG. 5) of the depressed portion 11e in the housing portion 11c. At this time, the depressed portion 11 f is not provided in the holder 11. Here, the case where the collimator lens 12 is positioned by being brought into contact with the inclined surface 11e ₁ is described. However, the positioning method of the collimator lens 12 is not limited to this. As a method for positioning the collimator lens 12, it is preferable as an embodiment that the collimator lens 12 is positioned by being pushed to a position where the front end face (the left end face shown in FIG. 3) is flush with the tip of the holder 11. . In this case, it is possible to position the collimator lens 12 is omitted contact work with the inclined surface 11e _1.

  Next, the UV curable resin layer 13 c and the reinforcing layer 13 d are removed from the tip of the GOF 13, and the exposed core 13 a and cladding 13 b are inserted into the through hole 143 of the adapter 14. At this time, the core 13a and the clad 13b are inserted into the through hole 143 so that the front end surface (the left side end surface shown in FIG. 3) is arranged on the same plane as the front end surface 141 of the adapter 14. An adhesive is applied to the rear end surface 142 of the adapter 14. In the process of inserting the core 13a and the clad 13b, the end surfaces of the ultraviolet curable resin layer 13c and the reinforcing layer 13d are bonded and fixed to the rear end surface 142 of the adapter 14. Thereby, the adapter 14 will be in the state holding the core 13a and the clad 13b of GOF13.

Then, the adapter 14 holding the GOF 13 is inserted into the through hole 11d through the insertion hole 11a. The adapter 14 is pushed in until the front end surface 141 comes into contact with the inclined surface 11e ₂ (see FIG. 5) of the depressed portion 11e. By pushed until it abuts against the inclined surface 11e _2, positioning of the collimator lens 12 is performed with the end face 131 of the GOF13 (end surface 131 of the core 13a and the cladding 13b).

In a state where the front end face 141 of the adapter 14 is in contact with the inclined surface 11e _2, recess 11f is formed in the holder 11. The depressed portion 11 f bites into the outer peripheral surface of the reinforcing layer 13 d of the GOF 13 and restricts the movement of the GOF 13 from the holder 11. Thereby, the GOF 13 is fixed to the holder 11. In this way, the optical collimator 10 shown in FIG. 3 is completed. In the method of assembling the optical collimator 10 shown in FIG. 3, the depressed portion 11e is provided, the GOF 13 with the adapter 14 is inserted into the cylindrical holder 11 that accommodates the collimator lens 12, and the depressed portion 11f is provided so that the GOF 13 is provided. Fix it. In particular, positioning of the collimator lens 12 and the adapter 14 does not require high-precision cutting or the like, and it is only necessary to insert the collimator lens 12 and the adapter 14 to a predetermined position in the straight pipe-shaped holder 11. Thereby, the collimator lens 12 and the adapter 14 can be positioned easily.

  The assembly order of the optical collimator 10 described above can be changed as appropriate. For example, the step of inserting the collimator lens 12 may be performed after the step of inserting the adapter 14 holding the GOF 13. Here, the case where the GOF 13 is bonded and fixed to the adapter 14 is described. However, the GOF 13 is not necessarily bonded and fixed to the adapter 14 on the assumption that the positional accuracy of the GOF 13 with respect to the adapter 14 is ensured. In this case, the step of bonding the GOF 13 to the adapter 14 can be omitted, and the optical collimator 10 can be assembled more easily.

  As described above, in the optical collimator 10 according to the first embodiment, a part of the collimator lens 12 and a part of the adapter 14 are applied to the inner surface (contact surface) of the depressed portion 11 e provided in the holder 11. Since the contact portion is positioned, the end surface 131 of the small-diameter GOF 13 (the front end surface 131 of the core 13a and the clad 13b) and the collimator lens 12 can be positioned with reference to the depressed portion 11e. Therefore, the end face 131 of the small-diameter GOF 13 (the front end face 131 of the core 13a and the clad 13b) and the collimator lens 12 are suppressed while suppressing an increase in cost compared with the case where a configuration for positioning is provided by cutting or the like. Positioning can be easily performed.

  In particular, the adapter 14 holds the core 13 a and the clad 13 b of the GOF 13. Since the GOF 13 holds the core 13a and the clad 13b that are sensitive to shock by the adapter 14, it can prevent the core 13a and the clad 13b from being damaged during the positioning operation.

  The adapter 14 holds the GOF 13 so that the end face 131 of the GOF 13 (the front end face 131 of the core 13a and the clad 13b) is disposed on the same plane as the front end face 141. Since the end surface 131 of the GOF 13 and the front end surface 141 of the adapter 14 are arranged on the same plane as described above, the GOF 13 can be positioned with reference to the front end surface 141 of the adapter 14, and therefore the end surface 131 of the GOF 13. And the collimator lens 12 can be positioned more easily.

  Further, the rear end surface 142 of the adapter 14 is bonded and fixed to the covering members (the ultraviolet curable resin layer 13c and the reinforcing layer 13d) of the GOF 13. Thereby, it becomes possible to perform the positioning operation between the end face of the GOF 13 and the collimator lens 12 in a state of being integrated with the adapter 14. In the first embodiment, the case where the rear end surface 142 of the adapter 14 is bonded and fixed to the UV curable resin 13c and the reinforcing layer 13d of the GOF 13 is described. However, the UV curable resin 13c and the reinforcing layer 13d are not fixed. Either of them may be bonded and fixed.

Further, the adapter 14 has the rear end surface 142 accommodated inside the holder 11 in a state where the front end surface 141 is pushed to a position where the front end surface 141 contacts the inclined surface 11e ₂ . Thereby, since the dimension of the adapter 14 can be reduced, the material cost of the adapter 14 can be reduced. Further, since the connection portion between the adapter 14 and the GOF 13 can be protected by the holder 11, it is possible to prevent an external impact from being applied to the connection portion.

  In the above description, the collimator lens 12 and the GOF 13 are positioned by bringing a part of the collimator lens 12 and a part of the adapter 14 into contact with the inner surface (contact surface) of the depressed portion 11 e provided in the holder 11. Explains what to do. However, the positioning method of the collimator lens 12 and the GOF 13 is not limited to this and can be changed as appropriate. For example, both the collimator lens 12 and the adapter 14 are not brought into contact with the depressed portion 11e, but only the adapter 14 is brought into contact, and the collimator lens 12 is positioned at the portion of the holder 11 other than the depressed portion 11e. Anyway. However, in this case, it is assumed that the portion for positioning the collimator lens 12 is designed to have a certain positional relationship with the depressed portion 11e. In other words, the optical collimator 10 according to the present invention includes an idea that, of the collimator lens 12 and the adapter 14, only the adapter 14 is brought into contact with the depressed portion 11e.

(Second Embodiment)
In 1st Embodiment, the case where the rear-end surface 142 of the adapter 14 holding GOF13 is accommodated inside the holder 11 is demonstrated. The second embodiment is different from the first embodiment in that the rear end surface of the adapter that holds the GOF 13 is disposed outside the holder 11.

  Hereinafter, the optical collimator 10 according to the second embodiment will be described with reference to FIG. 6, focusing on the differences from the first embodiment. FIG. 6 is a cross-sectional view of the optical collimator 10 according to the second embodiment. 6 shows a cross-section corresponding to AA shown in FIG. 2, as in FIG. In FIG. 6, the same components as those in FIG. 3 are denoted by the same reference numerals, and description thereof is omitted.

  In the optical collimator 10 according to the second embodiment, the adapter 16 has the same configuration as the adapter 14 according to the first embodiment except for the dimension in the insertion direction with respect to the holder 11. That is, the adapter 16 has a generally cylindrical shape, and its outer diameter is slightly smaller than the inner diameter of the through hole 11 d of the holder 11. The adapter 16 has a front end surface 161 and a rear end surface 162 parallel to a plane orthogonal to the insertion direction on the front side and the rear side in the insertion direction with respect to the holder 11.

  A through hole 163 that penetrates from the front end surface 161 to the rear end surface 162 is formed at the center of the adapter 16. The through-hole 163 is provided with a diameter slightly larger than the outer diameter of the cladding 13b of the GOF 13, as with the adapter 14 according to the first embodiment. The dimension from the front end surface 161 to the rear end surface 162 is configured to be longer than the through hole 11 d of the holder 11. For this reason, the rear end surface 162 of the adapter 16 is disposed outside the holder 11 with the front end surface 161 in contact with the inner surface (contact surface) of the depressed portion 11e.

  The positional relationship between the front end surface 161 of the adapter 16 and the end surface 131 of the GOF 13 (the front end surface 131 of the core 13a and the clad 13b) and the manner in which the GOF 13 is fixed to the rear end surface 162 of the adapter 16 are described in the first embodiment. It is the same as that of the adapter 14 which concerns on a form. That is, in the adapter 16, the end face 131 of the GOF 13 (the front end face 131 of the core 13 a and the clad 13 b) is disposed on the same plane as the front end face 161. The GOF 13 is bonded and fixed to the rear end surface 162 at the end surfaces of the ultraviolet curable resin layer 13 c and the reinforcing layer 13 d facing the rear end surface 162 of the adapter 16.

  The GOF 13 is fixed to the holder 11 by sandwiching the outer peripheral surface of the adapter 16 with the inner surface of the depressed portion 11f. That is, the position of the GOF 13 with respect to the holder 11 is indirectly fixed by sandwiching the adapter 16 to which the GOF 13 is bonded and fixed with the inner surface of the depressed portion 11f.

Here, an assembling method of the optical collimator 10 according to the second embodiment will be described with reference to FIG. In the optical collimator 10 according to the second embodiment, first, the collimator lens 12 is press-fitted into the accommodating portion 11c of the holder 11 provided with the depressed portion 11e. The collimator lens 12 is pushed in until it comes into contact with the inclined surface 11e ₁ (see FIG. 5) of the depressed portion 11e in the housing portion 11c. At this time, the depressed portion 11 f is not provided in the holder 11.

  Next, the ultraviolet curable resin layer 13 c and the reinforcing layer 13 d are removed from the tip of the GOF 13, and the exposed core 13 a and cladding 13 b are inserted into the through-hole 163 of the adapter 16. At this time, the core 13 a and the clad 13 b are inserted into the through-hole 163 so that the end surface 131 is disposed on the same plane as the front end surface 161 of the adapter 16. In addition, an adhesive is applied to the rear end surface 162 of the adapter 16. In the process of inserting the core 13a and the clad 13b, the end faces of the ultraviolet curable resin layer 13c and the reinforcing layer 13d are bonded and fixed to the rear end face 162 of the adapter 16. Thereby, the adapter 16 will be in the state which hold | maintained the core 13a and the clad | crud 13b of GOF13.

Then, the adapter 16 holding the GOF 13 is inserted into the through hole 11d through the insertion hole 11a. The adapter 16 is pushed in until the front end surface 161 comes into contact with the inclined surface 11e ₂ (see FIG. 5) of the depressed portion 11e. The end face 131 of the GOF 13 and the collimator lens 12 are positioned by being pushed into contact with the inclined surface 11e ₂ . In the optical collimator 10 according to the second embodiment, when the adapter 16 is inserted into the holder 11, the adapter 16 exposed from the holder 11 is inserted by grasping one end (the right side end shown in FIG. 6). Work can be done.

Then, in a state the front end face 161 of the adapter 16 is in contact with the inclined surface 11e ₂ (see FIG. 5), recess 11f is formed in the holder 11. The depressed portion 11 f bites into the outer peripheral surface of the adapter 16 and restricts the movement of the adapter 16 from the holder 11. Thereby, the GOF 13 is fixed to the holder 11. In this way, the optical collimator 10 shown in FIG. 6 is completed.

  As described above, also in the optical collimator 10 according to the second embodiment, a part of the collimator lens 12 and a part of the adapter 16 are brought into contact with the inner surface (contact surface) of the depressed portion 11 e provided in the holder 11. Since the positioning is performed, the collimator lens 12 can be positioned with respect to the end face 131 (the end face 131 of the core 13a and the clad 13b) of the small-diameter GOF 13 with reference to the depressed portion 11e. For this reason, it becomes possible to easily position the end face 131 of the small-diameter GOF 13 and the collimator lens 12 while suppressing an increase in cost as compared with the case where a configuration for positioning is provided by cutting or the like.

  In particular, in the optical collimator 10 according to the second embodiment, the rear end surface 162 of the adapter 16 is disposed outside the holder 11. Thereby, when the collimator lens 12 and the end face of the GOF 13 (left side end face shown in FIG. 6) are positioned, it is possible to work by gripping a part of the adapter 16 arranged outside the holder 11. It becomes possible to improve work efficiency.

(Third embodiment)
In 1st Embodiment, the case where the adapter 14 has the outer diameter of the same thickness in the front-back direction of the insertion direction with respect to the holder 11 is demonstrated. The third embodiment is different from the first embodiment in that a part of the outer diameter of the adapter is configured to be thinner than the other parts. More specifically, the adapter according to the third embodiment is the first embodiment in that the front side portion in the insertion direction with respect to the holder 11 is configured to have a smaller diameter than the rear side portion. Is different.

  When processing so that the depressed portion 11e greatly enters the inside of the holder 11 as in the first embodiment, a part of the inner peripheral surface of the holder 11 arranged around the depressed portion 11e is May squeeze inward. The range of the protruding portion increases or decreases according to the processing depth of the depressed portion 11e. That is, as the processing depth of the depressed portion 11e is deeper, the portion that protrudes toward the inside of the holder 11 becomes larger, and as the processing depth is shallower, the portion that protrudes toward the inner side of the holder 11 becomes smaller.

If the portion that protrudes toward the inside of the holder 11 is large, a situation may occur in which the outer edge portion of the front end surface 141 of the adapter 14 (for example, the upper end portion of the front end surface 141 shown in FIG. 3) contacts the protruding portion. That is, the front end surface 141 of the adapter 14, reaches the position in contact with the inner peripheral surface of the holder 11 before contact with the inclined surface 11e ₂ is a contact surface, attempts to positioning the original in relation to the inclined surface 11e ₂ Things that cannot be done can occur. In the third embodiment, in order to avoid the occurrence of such a situation, a part of the front side of the adapter is configured to have a smaller diameter than the rear side part.

  Hereinafter, the optical collimator 10 according to the third embodiment will be described with reference to FIG. 7, focusing on the differences from the first embodiment. FIG. 7 is a sectional view of the optical collimator 10 according to the third embodiment. 7 shows a cross-section corresponding to AA shown in FIG. 2 in the same manner as FIG. In FIG. 7, the same components as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

  In the optical collimator 10 according to the third embodiment, the adapter 17 has the same configuration as that of the adapter 14 according to the first embodiment, except that the adapter 17 has a small diameter portion at the front side portion in the insertion direction with respect to the holder 11. Have. That is, the adapter 17 has a generally cylindrical shape, and the outer diameter of the rear side portion thereof is provided slightly smaller than the inner diameter of the through hole 11 d of the holder 11. The adapter 17 has a front end surface 171 and a rear end surface 172 parallel to a plane orthogonal to the insertion direction on the front side and the rear side in the insertion direction with respect to the holder 11.

  A through hole 173 that penetrates from the front end surface 171 to the rear end surface 172 is formed at the center of the adapter 17. The through-hole 173 is provided with a diameter slightly larger than the outer diameter of the cladding 13b of the GOF 13 as with the adapter 14 according to the first embodiment. For example, although the dimension from the front end surface 171 to the rear end surface 172 is configured to be shorter than the through hole 11d of the holder 11, it is not limited to this. The dimension from the front end surface 171 to the rear end surface 172 may be longer than the through hole 11 d of the holder 11.

  A stepped portion 174 is provided near the center of the adapter 17 in the insertion direction with respect to the holder 11. The position of the stepped portion 174 is not limited to the vicinity of the center, and can be changed as appropriate. A large diameter portion 175 is provided on the rear side of the step portion 174, and a small diameter portion 176 is provided on the front side of the step portion 174. The outer diameter of the large diameter portion 175 is configured to be slightly smaller than the inner diameter of the through hole 11 d of the holder 11. The outer diameter of the small diameter portion 176 is configured to be slightly smaller than the outer diameter of the large diameter portion 175. The stepped portion 174 is composed of an inclined surface that connects the large diameter portion 175 and the small diameter portion 176. That is, the stepped portion 174 has a shape in which the outer diameter dimension decreases toward the front side in the insertion direction of the adapter 17 with respect to the holder 11.

The outer peripheral edge of the front end surface 171 of the adapter 17 (small-diameter portion 176) may have an acute edge configuration so that the adapter 17 (small diameter portion 176) can be accurately positioned when contacting the inclined surface 11e ₂ (see FIG. 5) as a contact surface. preferable. Or you may give the edge process which provides an extremely small round edge or taper edge. When the corner round edge is provided, the dimension of the corner R is preferably set to 30 μm or less. For example, the dimension of the corner R of the outer peripheral edge of the front end surface 171 of the small diameter portion 176 is set to 20 μm. By providing such a small square round edge, the positional accuracy of the adapter 17 with respect to the inclined surface 11e ₂ can be improved. Further, it is possible to easily insert the adapter 17 into the holder 11, and it is possible to prevent dust from being generated by scraping a part of the inner peripheral surface of the holder 11.

  In addition, in the optical collimator 10 according to the third embodiment, the case where the processing depth of the depressed portion 11e is reduced in order to reduce the portion protruding toward the inside of the holder 11 around the depressed portion 11e is shown. ing. By reducing the portion protruding toward the inside of the holder 11, it is possible to prevent the adapter 17 from contacting the inner peripheral surface of the holder 11 before a predetermined position.

  Here, an example of the dimension of the principal part of the optical collimator 10 in the third embodiment will be described. For example, the outer diameter of the holder 11 is set to 600 μm (micrometer), and the inner diameter of the holder 11 (through hole 11d) is set to 495 μm. The diameter of the collimator lens 12 is 500 μm.

  For example, the outer diameter of the large diameter portion 175 of the adapter 17 is configured to be 495 μm. The outer diameter of the small diameter portion 176 is preferably set to be 0.5 to 5.0% smaller than the outer diameter of the large diameter portion 175. For example, the outer diameter of the small diameter portion 176 is configured to be 475 μm. In this case, the dimension of the stepped portion 174 is configured to be 10 μm in a direction orthogonal to the insertion direction of the adapter 17 with respect to the holder 11. Although the dimension of the small diameter part 176 in the front-back direction is configured to be 600 μm, for example, it is not limited to this. The dimension of the small diameter portion 176 in the front-rear direction can be changed according to the state of the portion that protrudes to the inside of the holder 11 around the depressed portion 11e.

  Moreover, it is preferable that the inner diameter dimension in the formation location of the recessed part 11e of the holder 11 is set to 1.0%-20.0% smaller diameter than the inner diameter dimension of the through-hole 11d. For example, the inner diameter dimension at the place where the depression 11e is formed is set to 396 to 490 μm. Thus, by deforming in a relatively low range with respect to the inner diameter dimension of the through hole 11d, the range of the portion that protrudes to the inside of the holder 11 around the depressed portion 11e can be reduced.

  The positional relationship between the front end surface 171 of the adapter 17 and the end surface 131 of the GOF 13 (the front end surface 131 of the core 13a and the clad 13b) and the manner in which the GOF 13 is fixed to the rear end surface 172 of the adapter 17 are described in the first embodiment. It is the same as that of the adapter 14 which concerns on a form. That is, in the adapter 17, the end surface 131 of the GOF 13 (the front end surface 131 of the core 13 a and the clad 13 b) is disposed on the same plane as the front end surface 171. The GOF 13 is bonded and fixed to the rear end surface 172 at the end surfaces of the ultraviolet curable resin layer 13 c and the reinforcing layer 13 d facing the rear end surface 172 of the adapter 17. The GOF 13 is fixed to the holder 11 by sandwiching the outer peripheral surface of the reinforcing layer 13d of the GOF 13 with the inner surface of the depressed portion 11f.

Here, an assembling method of the optical collimator 10 according to the third embodiment will be described with reference to FIG. First, the collimator lens 12 is press-fitted into the accommodating portion 11c of the holder 11 provided with the depressed portion 11e. The collimator lens 12 has an inclined surface 11e ₁ of the depressed portion 11e (see FIG. 5) until the front end surface (the left side end surface shown in FIG. 3) of the collimator lens 12 is flush with the tip of the holder 11. ) Until it touches. At this time, the depressed portion 11 f is not provided in the holder 11. The collimator lens 12 may be positioned by contacting the inclined surface 11e _{1 as} in the _first embodiment.

  Next, the ultraviolet curable resin layer 13 c and the reinforcing layer 13 d are removed from the tip of the GOF 13, and the exposed core 13 a and the clad 13 b are inserted into the through hole 173 of the adapter 17. At this time, the core 13 a and the clad 13 b are inserted into the through-hole 173 so that the front end surface (the left side end surface shown in FIG. 7) is arranged on the same plane as the front end surface 171 of the adapter 17. An adhesive is applied to the rear end surface 172 of the adapter 17. In the process of inserting the core 13a and the clad 13b, the end surfaces of the ultraviolet curable resin layer 13c and the reinforcing layer 13d are bonded and fixed to the rear end surface 172 of the adapter 17. Thereby, the adapter 17 will be in the state holding the core 13a and the clad | crud 13b of GOF13.

Then, the adapter 17 holding the GOF 13 is inserted into the through hole 11d through the insertion hole 11a. In the optical collimator 10 according to the third embodiment, it is pushed to the front end face 171 of the adapter 17 in the state holding the GOF13 (front end surface 171 of the small diameter portion 176) abuts against the inclined surface 11e ₂ of the depressed portion 11e . Thereby, the end face 131 of the GOF 13 and the collimator lens 12 are positioned.

  As described above, also in the optical collimator 10 according to the third embodiment, a part of the collimator lens 12 and a part of the adapter 17 are brought into contact with the inner surface (contact surface) of the depressed portion 11 e provided in the holder 11. Since the positioning is performed, the collimator lens 12 can be positioned with respect to the end face 131 (the end face 131 of the core 13a and the clad 13b) of the small-diameter GOF 13 with reference to the depressed portion 11e. For this reason, it becomes possible to easily position the end face 131 of the small-diameter GOF 13 and the collimator lens 12 while suppressing an increase in cost as compared with the case where a configuration for positioning is provided by cutting or the like.

  In particular, in the optical collimator 10 according to the third embodiment, since the small-diameter portion 176 is provided in the front side portion in the insertion direction of the adapter 17 with respect to the holder 11, the depressed portion 11e is accompanied with the processing of the depressed portion 11e. The adapter 17 can be brought into contact with a desired position without being affected by the protruding portion formed around the periphery of the adapter. Thereby, the positional accuracy between the end face 131 of the small-diameter GOF 13 and the collimator lens 12 can be increased.

  In the third embodiment, a configuration is described in which the adapter 17 includes the stepped portion 174 and the small-diameter portion 176 is formed in the front side portion (the front side portion in the insertion direction with respect to the holder 11). However, the formation mode of the small diameter portion 176 is not limited to this, and can be appropriately changed. Any mode can be selected as long as the small-diameter portion 176 can be formed in the front portion of the adapter 17.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the said embodiment, GOF is illustrated and demonstrated as an optical fiber hold | maintained with the holder 11 via the adapter 14 (16). However, the optical fiber held by the holder 11 via the adapter 14 (16) is not limited to the GOF and can be changed as appropriate. For example, a POF having a diameter equivalent to that of the GOF as described above may be a holding target.

  Moreover, in the said embodiment, the case where the core 13a and the clad | crud 13b which GOF13 has in the adapter 14 (16) is inserted and hold | maintained is demonstrated. However, the configuration of the GOF 13 held by the adapter 14 (16) is not limited to this and can be appropriately changed. For example, in addition to the core 13a and the clad 13b, the ultraviolet curable resin 13c may be held by the adapter 14 (16).

10 optical collimator 11 holder 11a insertion hole 11b opening 11c accommodating portion 11d through holes 11e, 11f recess 11e _1, 11e ₂ the inclined surface 12 a collimator lens 13 and 15 optical fibers 13a, 15a core 131 end surfaces 13b, 15b cladding 13c ultraviolet curable Resin layer 13d, 15c Reinforcement layer 14, 16, 17 Adapter 141, 161, 171 Front end surface 142, 162, 172 Rear end surface 143, 163, 173 Through hole 174 Stepped portion 175 Large diameter portion 176 Small diameter portion 100 Optical connector 101 Semiconductor laser Chip 102 Case 103 Mount stand 104 Optical lens 105 Semiconductor laser unit 106 Opening portion 107 Insertion port 108 Support member

Claims (12)

A holding member having a cylindrical shape;
A lens housed in a housing portion formed at one end of the holding member;
An adapter that is inserted from an insertion hole formed at the other end of the holding member and holds one end of the optical fiber;
At least the adapter of the lens and the adapter is brought into contact with an abutment surface formed by providing a depression on the outer periphery in the vicinity of the holding portion of the holding member, and the end surface of the optical fiber and the lens An optical connecting member characterized by positioning.   2. The adapter according to claim 1, wherein the adapter holds the optical fiber such that a part of the end face of the optical fiber is disposed on the same plane as an end face on the front side in the insertion direction with respect to the holding member. The optical connection member as described.   3. The optical connection member according to claim 1, wherein an end face of the adapter in the insertion direction with respect to the holding member is bonded and fixed to a covering member included in the optical fiber.   4. The adapter according to claim 1, wherein an end surface of the adapter in a rear side in an insertion direction with respect to the holding member is accommodated inside the holding member in a state of being in contact with the contact surface. An optical connecting member according to claim 1.   4. The adapter according to claim 1, wherein an end surface of a rear side in an insertion direction with respect to the holding member is disposed outside the holding member in a state where the adapter is in contact with the contact surface. The optical connection member in any one.   The optical adapter according to any one of claims 1 to 5, wherein the adapter has a small-diameter portion having a smaller diameter than a rear-side portion at a part of the front side in the insertion direction with respect to the holding member. .   The holding member is formed with a recessed portion for fixing to press and fix the adapter inserted from the insertion hole or the coating member of the optical fiber in the vicinity of the end on the insertion hole side. The optical connecting member according to any one of claims 1 to 6.   The angle of the contact surface facing the adapter and the angle of the contact surface facing the lens are different from each other with respect to a plane orthogonal to the insertion direction of the adapter. The optical connection member according to claim 7.   The contact surface facing the adapter is an inclined surface, the angle of the inclined surface with respect to a plane perpendicular to the insertion direction of the adapter is 20 ° or less, and a part of the end surface of the adapter is in contact with the contact surface The optical connection member according to claim 1, wherein the optical connection member is formed.   The contact surface facing the lens is an inclined surface, the angle of the inclined surface with respect to a plane perpendicular to the insertion direction of the adapter is 0 ° or more and 45 ° or less, and a part of the lens is contacted with the inclined surface The optical connecting member according to claim 1, wherein the optical connecting member is made.   11. The optical connection according to claim 1, wherein the optical fiber is a glass optical fiber, and the adapter holds at least a core and a clad of the glass optical fiber. Element.   An optical connector comprising the optical connection member according to claim 1.

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