JP2013109140A - Optical fiber coupling device - Google Patents

Abstract

An optical fiber coupling device in which the focal point of a condensing lens and the center point of an end face of an optical fiber do not deviate even when the optical axis of a beam and the central axis of an optical fiber are aligned.
A spherical container 17 having a cavity 18, a spherical holder 12 having a fixing means for holding the end face of an optical fiber introduced into the cavity 18 at the center of the spherical container 17, and a cavity of the spherical holder 12 The condensing lens 35 introduced into 18, the storage case 14 that rotatably supports the spherical holder 12, the upper surface operation lever 43 connected to the spherical holder 12, the side surface operation lever 44, and the rotation of the upper surface operation lever 43. Light provided with a rotation direction restricting mechanism 50 that restricts movement to reciprocating rotation on one plane and a rotation direction restricting mechanism 65 that restricts rotation of the side operation lever 44 to reciprocating rotation on one plane. Fiber coupler 10. The axis of the optical fiber held by the spherical holder 12 is rotated in the tilt direction by reciprocating rotation of the upper surface operation lever 43, and the axis of the optical fiber is rotated in the rotation direction by reciprocating rotation of the side operation lever 44.
[Selection] Figure 1

Description

  The present invention relates to an optical fiber coupling device, and more particularly to an optical fiber coupling device including an optical axis adjusting mechanism that aligns the central axis of an optical fiber and the optical axis of a beam emitted from a light source in a straight line.

When a beam emitted from a light source such as a laser oscillator is transmitted through an optical fiber, the focal point of the beam condensed by the condenser lens is focused on the end face of the optical fiber in order to minimize light coupling loss. Simultaneously with the center point, it is necessary to adjust the optical axis so that the optical axis of the beam and the central axis of the optical fiber are aligned linearly (see Patent Document 1).
JP 4-311906

FIG. 10 is a schematic view illustrating a conventional optical axis adjustment method, in which a beam α irradiated from a light source (not shown) is collected by a condenser lens 35 and exposed to an end face of a ferrule 41 of an optical fiber terminal 40. A state of entering the fiber is depicted.
In this case, the position of the lens holder 16 and the position of the optical fiber terminal 40 are first adjusted so that the focal point F of the condenser lens 35 and the center point C of the optical fiber overlap (FIG. 10A).

Next, by monitoring the amount of light output from the rear end of the optical fiber 70, it is checked whether the optical axis of the beam α and the central axis of the optical fiber are aligned.
If the optical axes are not aligned, the axis of the holder 80 holding the optical fiber terminal 40 is finely adjusted to align both axes (in the figure, the angle of the optical fiber terminal 40 is Although adjustment of the tilt direction to be displaced up and down is shown, in practice, adjustment of the rotation direction to displace the angle of the optical fiber terminal 40 to the left and right is also performed).

However, as shown in FIG. 10 (b), when the angle of the optical fiber terminal 40 is adjusted, the focal point F of the condensing lens 35 and the center point C of the optical fiber are shifted from each other. Need to be performed again.
Therefore, conventionally, it is necessary to repeat the alignment of the focal point F of the condenser lens 35 and the center point C of the optical fiber and the alignment of the optical axis of the beam α and the central axis of the optical fiber, which is extremely inefficient. Work was forced.

  The present invention has been devised to solve the above-described conventional problems, and after the alignment between the focal point of the condenser lens and the center point of the optical fiber is completed, the optical axis of the beam and the center of the optical fiber are completed. An object of the present invention is to provide an optical fiber coupling device in which the focal point of the condensing lens and the center point of the optical fiber are not shifted even when the axis is aligned with the axis.

  In order to achieve the above object, an optical fiber coupling device according to claim 1, wherein a spherical container having a hollow portion therein and an end face of the optical fiber introduced into the hollow portion are held at the center of the spherical container. A spherical holder having a fixing means for carrying out, a light coupling object introduced into the hollow portion of the spherical holder, a case for rotatably supporting the spherical holder, and a first connected to the spherical holder An operation lever, a second operation lever connected to the spherical holder, and a first rotation direction restricting means for limiting the rotation of the first operation lever to a reciprocating rotation on one plane. A second rotation direction restricting means for limiting the rotation of the second operation lever to reciprocal rotation on one plane, and the spherical holder is moved to the spherical holder by the reciprocal rotation of the first operation lever. The optical fiber shaft is held The first optical axis is rotated so that the axis of the optical fiber is rotated in a rotation direction (left-right direction) orthogonal to the tilt direction by reciprocating rotation of the second operation lever. The operation lever, the second operation lever, the first rotation direction restricting means, and the second rotation direction restricting means are arranged.

The first operating lever is for rotating the axis of the optical fiber up and down along the vertical plane with the end thereof as the center, and the first operating lever is rotated by the first rotating direction restricting means. The direction is limited to reciprocating rotation on a plane parallel to the vertical plane. The second operating lever is for rotating the axis of the optical fiber from side to side along the horizontal plane around its end, and the second operating direction is controlled by the second rotating direction restricting means. The moving direction is limited to reciprocating rotation on a plane parallel to the horizontal plane.
Rotation direction restricting means Rotation direction restricting means

  An optical fiber coupling device according to a second aspect is the device according to the first aspect, wherein the first rotation direction restricting means includes a linear guide and a contact piece provided on a side surface of the linear guide. And an urging means for pressing the first operating lever toward the abutting piece, and an adjusting screw whose tip is in contact with the opposite surface of the abutting piece. One operating lever has a structure that reciprocally rotates along the linear guide, and the second rotation direction restricting means includes a linear guide and a contact piece provided on a side surface of the linear guide. And an urging means that presses the second operating lever toward the contact piece portion, and an adjustment screw whose tip is in contact with the opposite surface of the contact piece portion. The operating lever has a structure that reciprocates along the linear guide. It is characterized in.

  According to a third aspect of the present invention, there is provided the optical fiber coupling device according to the second aspect, wherein the first rotation direction restricting means further includes the contact piece and the linear guide. An urging means for pressing the corner portion with the side surface is provided.

  According to a fourth aspect of the present invention, there is provided the optical fiber coupling device according to the second aspect, wherein the first operation lever is further engaged with one surface of the contact piece portion of the first rotation direction regulating means. A concave portion is formed.

  An optical fiber coupling device according to a fifth aspect is the device according to the first to fourth aspects, wherein the fixing means further includes a partition wall for partitioning the cavity of the spherical holder, and an optical fiber insertion formed on the partition wall. It is characterized by comprising a common through hole and a connector for fixing an optical fiber terminal accommodating an optical fiber to the partition wall.

  An optical fiber coupling device according to a sixth aspect is the device according to any one of the first to fifth aspects, wherein the optical coupling object is a condensing lens housed in a lens holder. The focal point is positioned at the center of the spherical holder.

  An optical fiber coupling device according to a seventh aspect is the device according to the sixth aspect, wherein a dust-proof ring made of a material having elasticity is fitted on the outer peripheral surface of the lens holder. Is introduced into the hollow portion of the spherical holder, the outer peripheral surface of the dust-proof ring is in close contact with the inner wall surface of the hollow portion.

According to the optical fiber coupling device of the present invention, the end of the optical fiber is held at the center of the spherical container, and the shaft of the optical fiber is rotated together with the spherical container by the rotation of the first operation lever and the second operation lever. Has a structure that rotates around the end, so that the center point of the end of the optical fiber may deviate from the center point of the spherical container even if the axis of the optical fiber is rotated in the tilt direction or the rotation direction. Absent.
For this reason, it can be effectively avoided that the focal position of the condensing lens once aligned and the center point of the optical fiber are shifted due to optical axis alignment.

  FIG. 1 shows an optical fiber coupling device 10 according to the present invention, which includes a spherical holder 12, a storage case 14 for the spherical holder 12, and a cylindrical lens holder 16.

The spherical holder 12 is mainly composed of a spherical container 17 made of a metal material such as aluminum, and the spherical container 17 is provided with a cylindrical cavity 18.
The hollow portion 18 is partitioned by a disk-shaped partition wall 20, and a through hole 20a for inserting a ferrule of an optical fiber is formed at the center of the partition wall 20.
Further, a connector 22 for attaching an optical fiber terminal is formed on one surface of the partition wall 20.
The partition wall 20 is fixed to a circular flange 23 projecting from the inner surface of the cavity 18 via screws (not shown).

The spherical container 17 has a cylindrical portion 24 formed by cutting a part of a sphere from the viewpoint of space saving and weight reduction, but this is not an essential configuration.
Therefore, it is naturally possible to use a true spherical container 17 that does not have the cylindrical portion 24.

The storage case 14 of the spherical holder 12 includes a pressing member 25, a lid member 26, and a case body 27.
The case body 27 includes an upper surface opening 27a, a front surface opening 27b, and a rear surface opening 27c.

  After the spherical holder 12 is loaded into the case main body 27 from the upper surface opening 27a, the upper surface opening 27a is closed by the pressing member 25 and the lid member 26. Thereafter, the screw 28 inserted into the through hole 26a of the lid member 26 is screwed into the screw hole 27d of the case body 27, whereby the lid member 26 is fixed to the case body 27.

  A plurality of spring accommodating recesses 25a are formed on the upper surface of the pressing member 25, and the lower end side of the compression coil spring 29 is loaded therein. A plurality of spring housing recesses 26b are also formed on the lower surface of the lid member 26, and when the lid member 26 is put on the pressing member 25, the upper end side of the compression coil spring 29 is inserted into each recess 26b. . As a result, the pressing member 25 is always urged toward the spherical container 17 by the repulsive force of each compression coil spring 29.

A spherical receiving portion 31 is formed on the bottom surface of the case body 27 and comes into contact with the spherical portion 30 of the spherical container 17.
A spherical pressing portion 25 b is formed on the lower surface of the pressing member 25 and comes into contact with the spherical portion 30 of the spherical container 17.
In the spherical holder 12, the front opening 18a and the rear opening 18b of the cavity 18 are aligned in a direction in which the front opening 27b and the rear opening 27c of the case body 27 communicate with each other.

A condensing lens 35 is fitted at the tip of the lens holder 16.
The lens holder 16 is supported in the horizontal direction by a stand 36.
A groove 37 is formed along the circumference on the outer peripheral surface of the front end portion of the lens holder 16, and a dustproof ring 38 is fitted into the groove 37. The dust-proof ring 38 is made of elastic silicon rubber or the like.

As shown in FIG. 2, the tip of the lens holder 16 is inserted into the cavity 18 of the spherical holder 12 from the front opening 27 b of the case body 27 and the front opening 18 a of the spherical holder 12.
At this time, the dust-proof ring 38 fitted on the outer peripheral surface of the tip end portion of the lens holder 16 is in close contact with the inner peripheral surface of the hollow portion 18 of the spherical holder 12.

The optical fiber terminal 40 is attached to the connector 22 provided on the partition wall 20 of the spherical holder 12.
As a result, the ferrule 41 protruding from the distal end portion of the optical fiber terminal 40 is inserted into the through hole 20a of the partition wall 20 and led out to the condenser lens 35 side.

At this time, the positions and dimensions of the respective parts (the positions where the partition wall 20 and the connector 22 are attached, the positions of the through holes 20a, so that the center point C of the optical fiber core exposed on the end face of the ferrule 41 matches the center point of the spherical holder 12) The forming position, the protruding amount of the ferrule 41, etc.) are set.
Further, as will be described later, the lens holder 16 is positioned so that the focal position F of the condenser lens 35 exactly coincides with the center point C of the optical fiber.

The upper surface of the spherical holder 12 is provided with a screw hole 42 for fixing the lever. By screwing a screw 43a provided at the tip of the upper surface operation lever 43 into the screw hole 42, the upper surface operation lever 43 is It is fixed to the upper surface of the spherical holder 12.
The rear end portion of the upper surface operation lever 43 is taken out through the opening 25c of the pressing member 25 and the opening 26a of the lid member 26.

  FIG. 3 is a cross-sectional view of the spherical holder 12 observed from the front opening 18a side (for convenience of illustration, the lens holder 16 is omitted). As is clear from this figure, the side of the spherical holder 12 has a lever. A fixing screw hole 42 is provided. Then, the side operation lever 44 is inserted into the side surface of the spherical holder 12 by inserting the screw 44a provided at the tip of the side operation lever 44 from the side opening 27d of the case body 27 and screwing it into the screw hole 42. Fixed.

Here, if the upper surface operation lever 43 is moved in the left-right direction in FIG. 2, the spherical holder 12 is rotated in the tilt direction.
Further, as shown in FIG. 4 which is a top sectional side view, when the side operation lever 44 is moved in the left-right direction in the figure, the spherical holder 12 is rotated in the rotation direction (a direction orthogonal to the tilt direction). .
However, the spherical holder 12 is provided with the spherical portion 30 as described above, and the pressing portion 25b of the pressing member 25 and the receiving portion 31 of the case main body 27 that are in contact with this also have a spherical surface, so in this state, By moving the upper surface operation lever 43 and the side surface operation lever 44, the spherical holder 12 rotates randomly in all directions.
For this reason, a mechanism is provided outside the storage case 14 to regulate the rotation direction of the upper surface operation lever 43 and the side operation lever 44.

FIG. 5A shows, as an example, a rotation direction regulating mechanism 50 of the upper surface operation lever 43, and a case 51, a linear guide 52 disposed in the case 51, and a bottom surface of the case 51. A lever introduction hole 53 provided, a compression coil spring 54 for pressing the upper surface operation lever 43 inserted into the housing 51 from the lever introduction hole 53, a screw hole 55 provided in the wall portion of the housing 51, An adjustment screw 56 screwed into the screw hole 55 and a tension coil spring 57 are provided.
The rotation direction regulating mechanism 50 of the upper surface operation lever 43 is attached to the upper surface of the lid member 26.

The lever introduction hole 53 has a sufficient size so that the upper surface operation lever 43 can reciprocate within a predetermined range.
Further, the linear guide 52 includes a movable portion 59 disposed so as to be able to reciprocate along a linear rail 58, and a contact piece portion 60 projects from a side surface 59a of the movable portion 59. .
Since the tip tip 54 a of the compression coil spring 54 is in contact with the upper surface operation lever 43, the upper surface operation lever 43 is constantly pressed toward the first surface 60 a of the contact piece 60. The tip of the adjustment screw 56 is in contact with the second surface 60 b of the contact piece 60.

As a result, when the adjustment screw 56 is rotated to the right to increase the protruding amount of the tip, the movable portion 59 of the linear guide 52 moves to the right in the figure as shown in FIG. The operation lever 43 is tilted in the same direction.
Further, when the adjustment screw 56 is rotated to the left to reduce the protruding amount of the tip, the upper surface operating lever 43 and the movable portion 59 of the linear guide 52 move in the left direction in the figure due to the repulsive action of the compression coil spring 54. And return to the original position.

  Since the tension coil spring 57 is stretched between the pin 61 connected to the top of the top operation lever 43 and the pin 62 fixed to the bottom surface inside the casing 51, the top operation lever 43 is in contact with the tension coil spring 57. The corner portion between the first surface 60a of the piece portion 60 and the side surface 59a of the movable portion 59 is always urged. As a result, extra play (backlash) does not occur in the upper surface operation lever 43.

FIG. 6A shows a rotation direction regulating mechanism 65 of the side operation lever 44. The casing 51 is the same as described above, the linear guide 52 arranged in the casing 51, and the bottom surface of the casing 51. A lever introduction hole 53 provided in the housing 51, a compression coil spring 54 that presses the side operation lever 44 inserted into the housing 51 from the lever introduction hole 53, and a screw hole 55 provided in the wall portion of the housing 51. And an adjusting screw 56 screwed into the screw hole 55.
The rotation direction regulating mechanism 65 of the side operation lever 44 is attached to the side surface of the case main body 27.

The lever introduction hole 53 has a sufficient size so that the side operation lever 44 can reciprocate within a predetermined range.
Further, the linear guide 52 includes a movable portion 59 disposed so as to be able to reciprocate along a linear rail 58, and a contact piece portion 60 projects from a side surface 59a of the movable portion 59. .
Since the tip tip 54 a of the compression coil spring 54 is in contact with the side operation lever 44, the side operation lever 44 is always pressed toward the first surface 60 a of the contact piece 60. The tip of the adjustment screw 56 is in contact with the second surface 60 b of the contact piece 60.

As a result, when the adjustment screw 56 is rotated to the right to increase the protruding amount of the tip, the movable portion 59 of the linear guide 52 moves to the right in the figure as shown in FIG. The operation lever 44 is tilted in the same direction.
Further, when the adjustment screw 56 is rotated to the left to reduce the protruding amount at the tip, the side operation lever 44 and the movable portion 59 of the linear guide 52 move in the left direction in the figure due to the repulsive action of the compression coil spring 54. And return to the original position.

As described above, as a result of the upper surface operation lever 43 being constantly urged in the constant direction by the tension coil spring 57, the spherical holder 12 itself is also urged in the same direction.
For this reason, the side operation lever 44 is also always urged to the corner between the first surface 60a of the contact piece 60 and the side surface 59a of the movable portion 59, and the tension coil spring 57 is not particularly provided. No extra play occurs on the side operation lever 44.

  As described above, instead of always urging the upper surface operation lever 43 in a constant direction by the tension coil spring 57, the tension coil spring 57 is provided on the side of the rotation direction regulating mechanism 65 of the side operation lever 44, and the side operation lever The same effect can be achieved even if the configuration is such that 44 is always urged in a certain direction.

Hereinafter, a method for adjusting the optical axis in the optical fiber coupler 10 will be described.
First, as shown in FIG. 7A, the focal position F by the condenser lens 35 and the center point C of the optical fiber (= the center point of the spherical holder 12) are aligned.
The coincidence / non-coincidence between the focal position F and the center point C is, for example, that a visible light laser of a fiber checker (not shown) is incident from the rear end of the optical fiber 70 and the visible light emitted from the rear end of the lens holder 16. Whether or not the laser β can pass through a plurality of pinholes on a preset optical path is confirmed.
Then, when the visible light laser β is not emitted from the rear end of the lens holder 16 or when the visible light laser β cannot pass through the pinhole even if emitted, it is determined that the focal position F and the center point C do not match, The position, height, angle and the like of the lens holder 16 are finely adjusted.

Next, the beam α from the light source (not shown) is guided into the lens holder 16 and the amount of light output from the rear end of the optical fiber 70 is measured to calculate the ratio with the amount of light of the input beam α.
If the ratio of the output light quantity is below a predetermined threshold, it is determined that the center axis of the optical fiber does not coincide with the optical axis of the beam, and the adjustment screw 56 of the top operation lever 43 or the side operation lever The 44 adjusting screws 56 are rotated in an arbitrary direction to finely adjust the tilt angle and the rotation angle of the spherical holder 12.
During this time, the amount of light output from the rear end of the optical fiber 70 is observed, and the adjustment is terminated when the amount exceeds the threshold value.

In the case of this optical fiber coupling device 10, the spherical holder 12 that supports the optical fiber terminal 40 basically has a spherical shape, and the center point C of the optical fiber is disposed at the center point of this sphere. 7 (b), even if the orientation of the spherical holder 12 is adjusted and the angle of the optical fiber terminal 40 is displaced, the center point C of the optical fiber is still located at the center of the spherical holder 12, There is no deviation from the focal position F of the optical lens 35.
For this reason, it is not necessary to adjust the position of the focal point F of the condenser lens 35 and the center point C of the optical fiber again.

Further, a dust-proof ring 38 is fitted on the outer peripheral surface of the tip portion of the lens holder 16, and the outer peripheral surface of the dust-proof ring 38 has a structure in close contact with the inner surface of the hollow portion 18 of the spherical holder 12. It is possible to effectively suppress the presence of dust between the condenser lens 35 and the optical fiber. For this reason, for example, it is possible to prevent the occurrence of an accident in which a high-power laser beam is irradiated on the dust to generate high heat.
Thus, by adopting a structure in which the dust-proof ring 38 is attached to the tip of the lens holder 16 and its outer peripheral surface is in close contact with the inner surface of the cavity 18 of the spherical holder 12, the focal length of the condenser lens 35 is extremely high. Even if it is short, it has an advantage that a dustproof space can be formed effectively.

The dust-proof ring 38 is made of an elastic material as described above. The inner diameter of the dust-proof ring 38 is set slightly larger than the diameter of the groove 37 of the lens holder 16, and the thickness of the dust-proof ring 38 is set slightly thinner than the width of the groove 37 of the lens holder 16. Therefore, a slight gap is secured between the dust-proof ring 38 and the groove 37.
For this reason, even if the spherical holder 12 is rotated for adjusting the optical axis, this positional variation can be absorbed well and the contact state with the inner surface of the cavity 18 can be maintained.

  In the above description, the configuration in which play on the top operation lever 43 and the side operation lever 44 is suppressed by constantly urging the top operation lever 43 in a certain direction by the tension coil spring 57 has been described. The method is not limited to this.

For example, as shown in FIG. 8, a V-shaped recess 72 is formed on the first surface 60 a of the contact piece 60, and the upper operation lever 43 is engaged with the recess 72. In this case, since the upper surface operation lever 43 is constantly urged toward the concave portion 72 of the contact piece 60 by the compression coil spring 54, play of the upper surface operation lever 43 can be suppressed without using the tension coil spring 57.
Instead of providing the V-shaped recess 72 on the rotation direction regulating mechanism 50 side of the upper surface operation lever 43, the side operation lever 44 is provided on the rotation direction regulating mechanism 65 side of the side operation lever 44. It may be configured to engage with 72.

In the above, an example in which the pressing portion 25b of the pressing member 25 is formed in a spherical shape and the receiving portion 31 on the bottom surface of the case main body 27 is formed in a spherical shape has been shown, but as shown in FIG. 9, the pressing portion 25b And the receiving part 31 can also be formed in a truncated cone shape.
As a result, the outer surface of the spherical holder 12 comes into line contact with the conical surface instead of the spherical surface, but this does not impair the smoothness of rotation.

It is an exploded view which shows the structure of the optical fiber coupling device based on this invention. It is side surface sectional drawing of an optical fiber coupling device. It is front side sectional drawing of an optical fiber coupling device. It is upper surface side sectional drawing of an optical fiber coupling device. It is sectional drawing which shows the rotation direction control mechanism of an upper surface operation lever. It is sectional drawing which shows the rotation direction control mechanism of a side operation lever. It is explanatory drawing which shows the optical axis adjustment method of an optical fiber coupling device. It is a cross section which shows the other structural example of the rotation direction control mechanism of an upper surface side operation lever. It is an exploded view which shows the other structural example of the optical fiber coupling device based on this invention. It is explanatory drawing which shows the conventional optical axis adjustment method.

10 Optical fiber coupler
12 Spherical holder
14 Storage case
16 Lens holder
17 Spherical container
18 Spherical holder cavity
20 Bulkhead
22 Connector
25 Holding member
25b Pressing part of pressing member
26 Lid member
27 Case body
29 Compression coil spring
31 Receiver
32 Holding part
35 condenser lens
36 Stand
37 groove
38 Dust-proof ring
40 Optical fiber terminal
41 Ferrule
43 Top control lever
44 Side control lever
50 Rotation direction regulating mechanism
52 Linear guide
53 Lever introduction hole
54 Compression coil spring
55 Screw holes
56 Adjustment screw
58 rails
59 Moving parts
60 Contact piece
65 Rotation direction regulating mechanism
70 Optical fiber F Focus point of condensing lens C Center point of optical fiber

Claims (7)

A spherical container having a hollow portion therein, and a spherical holder provided with a fixing means for holding the end of the optical fiber introduced into the hollow portion at the center of the spherical container;
An optical coupling object introduced into the hollow portion of the spherical holder;
A case for rotatably supporting the spherical holder;
A first operating lever connected to the spherical holder;
A second operating lever connected to the spherical holder;
First rotation direction restricting means for limiting the rotation of the first operation lever to reciprocal rotation on one plane;
Second rotation direction restricting means for limiting the rotation of the second operation lever to reciprocal rotation on one plane;
The axis of the optical fiber held by the spherical holder is rotated in the tilt direction by the reciprocating rotation of the first operation lever, and the axis of the optical fiber is rotated in the tilt direction by the reciprocating rotation of the second operation lever. The first operation lever, the second operation lever, the first rotation direction restricting means, and the second rotation direction restricting means are arranged so as to rotate in a rotation direction orthogonal to the rotation direction. An optical fiber coupling device. The first rotation direction regulating means includes a linear guide, an abutting piece provided on a side surface of the linear guide, and an urging means for pressing the first operating lever toward the abutting piece; An adjustment screw whose tip is in contact with the opposite surface of the contact piece, and the rotation of the adjustment screw has a structure in which the first operating lever reciprocates along the linear guide.
The second turning direction restricting means includes a linear guide, an abutting piece provided on a side surface of the linear guide, and an urging means for pressing the second operating lever toward the abutting piece. And an adjusting screw whose tip is in contact with the opposite surface of the abutting piece, and the second operating lever reciprocally rotates along the linear guide by the rotation of the adjusting screw. The optical fiber coupling device according to claim 1.   The said 1st rotation direction control means is provided with the urging means which presses the said 1st operation lever to the corner | angular part of the said contact piece part and the side surface of a linear guide. The optical fiber coupling device described.   3. The optical fiber coupling device according to claim 2, wherein a concave portion for engaging the first operation lever is formed on one surface of the contact piece portion in the first rotation direction regulating means.   The fixing means includes a partition partitioning the hollow portion of the spherical holder, a through hole for inserting an optical fiber formed in the partition, and a connector for fixing an optical fiber terminal accommodating the optical fiber to the partition. The optical fiber coupling device according to any one of claims 1 to 4, wherein The optical coupling object is a condenser lens housed in a lens holder,
6. The optical fiber coupling device according to claim 1, wherein the focal point of the condensing lens is positioned at the center of the spherical holder.   A dustproof ring made of a material having elasticity is fitted on the outer peripheral surface of the lens holder, and when the lens holder is introduced into the hollow portion of the spherical holder, the outer peripheral surface of the dustproof ring is The optical fiber coupling device according to claim 6, wherein the optical fiber coupling device is in close contact with the inner wall surface.

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