JPH0610907U - Optical axis adjustment device for laser light incident on optical fiber - Google Patents

Abstract

(57) [Summary] [Objective] The tilt adjustment mechanism and the XY axis adjustment mechanism are associated with each other in a unique manner so that the optical axis of the laser beam incident on the optical fiber can be easily adjusted. An inner cylindrical body 19 having a spherical concave surface 24 is provided inside the outer cylindrical body 10, and a spherical convex surface 37 matching the spherical concave surface 24 is movably engaged with the inside of the cylindrical body 19. The optical fiber connection tube 31 is provided, and the lens system 50 is provided in the connection tube 31 with its center C aligned with the center c of the connection tube spherical convex surface 37. The XY axis adjustment and the tilt adjustment of the lens system 50 are performed, and the optical axis is adjusted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an optical axis adjustment for aligning the optical axis of laser light with the center of the end face of the optical fiber when the laser light emitted from a laser light source such as a laser output tube is incident on the optical fiber through the lens system. It relates to the device.

[0002]

[Prior art and its problems]

 As is well known, when the laser light emitted from the laser light source is incident on the optical fiber, the optical axis of the laser light is adjusted by tilt adjustment, etc., but in this type of device that has been conventionally proposed, the tilt adjustment mechanism is used. Since no special consideration was given, it was not easy to adjust the optical axis, which required considerable labor and time.

An object of the present invention is to eliminate all of these problems, and it is provided with a tilt adjusting mechanism and an XY axis adjusting mechanism, and these two mechanisms are ideally associated with each other in a unique manner. Therefore, it is an object of the present invention to provide a device for adjusting the optical axis of an incident laser beam on an optical fiber that can easily adjust the optical axis.

[0004]

[Means for solving problems]

 In order to achieve this object, the present invention has an outer cylindrical body on which a laser light source is mounted, a flange portion including two flat surfaces, and a cylindrical portion, and a spherical concave surface is formed on the opening surface on the flange portion side. An inner cylindrical body that is formed and is coaxially arranged in the main body in a state that the flange portion is movably inserted into a recess provided in the inner peripheral diameter direction of the outer cylindrical body; The outer peripheral stepped portion, which has a concentric large-diameter cylindrical portion, a slightly small-diameter cylindrical portion, and a small-diameter cylindrical portion including two partially flat surfaces, and which is formed by the large-diameter cylindrical portion and the small-diameter cylindrical portion A spherical convex surface is formed to fit the spherical concave surface, the spherical convex surface is fitted to the spherical concave surface, and a small diameter cylindrical portion is coaxially arranged inside the inner cylindrical body. The center of the spherical convex surface and the center of the lens system should be aligned within the large-diameter cylindrical portion of the cylinder. And a lens system movably provided in the axial direction, and an optical fiber connecting tube for the laser light source through an adjusting operation of a tilt adjusting screw and an XY axis adjusting screw provided on the outer cylindrical body. The tilt adjustment and the XY axis adjustment are performed so that the optical axis of the laser light emitted from the laser light source and the center of the end face of the optical fiber on which the laser light is incident via the lens system are aligned. It is characterized by a modified configuration.

[0005]

【Example】

 An embodiment will be described with reference to the drawings together with the operation thereof. 1 is a vertical sectional view, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. Has a through hole 14 composed of a concentric large-diameter portion 11 and a small-diameter portion 13 via a step portion 12, and a mounting mount 15, which is screwed to the end portion of the main body 10 on the small-diameter portion side, A laser light emitting tube 18 having a laser light source 17 is attached via a member such as a mounting screw 16.

An inner cylindrical body 19 is coaxially arranged in the through hole 14 of the main body 10. As shown in FIG. 2, the cylindrical body 19 is a substantially inverted T-shape having a flange portion 20 having two flat surfaces 21 and 22 and a cylindrical portion 23 integrally, and its flange portion 20 side. The opening surface has a spherical concave surface 24, and the rear end surface of the cylindrical portion 23 has a spring receiving portion 25. The cylindrical body 19 is movably placed in a concave portion 27 of an annular body 26 having a cylindrical longitudinal cross section, the flange portion 20 of which is engaged with the inner peripheral step portion 12 of the main body 10, and above the cylindrical body 19. A gap 28 is provided between the end surface and the inner peripheral surface of the large-diameter portion 11 of the main body. The annular body 26 is pressed and supported by a leaf spring 29, and the leaf spring 29 is supported by a holding screw 30 which is screwed and fixed in a screw hole of the large diameter portion 11 of the main body.

An optical fiber connecting tube 31 is coaxially arranged in the inner cylindrical body 19. The connecting cylinder 31 integrally has a concentric large-diameter cylindrical portion 32 and a slightly small-diameter cylindrical portion 33, and a small-diameter cylindrical portion 34 including two partially flat surfaces 35 and 36 as shown in FIG. At the same time, the outer peripheral step formed by the large-diameter cylindrical portion 32 and the small-diameter cylindrical portion 34 has a spherical convex surface 37 that matches the spherical concave surface 24 of the inner cylindrical body 19, and the front end portion of the slightly small-diameter cylindrical portion 33. The outer circumference and the outer circumference of the rear end of the small-diameter cylindrical portion 34 have screw portions 38 and 39. The optical fiber connection tube 31 has a small diameter portion 42 extending from the small diameter tubular portion 33 to the large diameter tubular portion 32 and a small diameter portion 42 via the step portion 41 and a small diameter portion 44 via the step portion 43. The through hole 45 is made up of, and the slightly smaller diameter portion 42 has a long hole 46 and the front end inner peripheral surface has a screw portion 47. The spherical convex surface 37 of the connecting cylinder 31 is fitted to the cylindrical spherical concave surface 24, and the small-diameter cylindrical portion 34 is coaxially positioned inside the cylindrical cylindrical portion 23. A spring receiving nut 48 is screwed onto the threaded portion 39 of the small-diameter tubular portion 34 of the connecting tube 31, and a spring 49 is elastically mounted between the nut 48 and the spring receiving portion 25 of the inner cylindrical body 19. The inner cylinder 19 is constantly pressed and held by the spring 49 toward the optical fiber connection side, and the connection cylinder 31 is constantly pressed and held toward the laser light source 17 side, so that the spherical concave surface 24 of the inner cylinder 19 and the connection cylinder 31 are The spherical convex surface 37 is always held in a good spherical contact state.

A lens system 50 is provided on the large-diameter portion 40 of the optical fiber connecting tube 31 via a lens holder 51, and its center C is aligned with the center c of the connecting tube spherical convex surface 37. The lens holder 51 is fixedly supported in the lens holder 51 by a holding nut 53 via a holding cylinder 52, and a spring 54 is mounted between the holding nut 53 and the inner peripheral step portion 43 of the connecting cylinder 31. The spring 54 constantly presses and holds the lens holder 51 toward the optical fiber connection side to prevent backlash.

A focus adjusting ring 56 is screwed to the outside of the slightly small diameter tube portion 33 of the optical fiber connection tube 31 via an intermediate ring 55, and a set nut is attached to the outer peripheral thread portion 38 of the slightly small diameter tube portion 33. 57 is fixed by screwing, and the intermediate ring 55 and the lens holder 51 are connected via a long hole 46 of the optical fiber connecting tube 31 by a retaining pin 58 which also functions as a rotation stopper for the intermediate ring and the lens holder. The lens holder 51 together with the intermediate ring 55 moves back and forth in the direction of the solid line arrow shown in FIG. 1 in the range of the elongated hole 46 by the forward and reverse rotation operations of the focus adjustment ring 56, which causes the lens system 50 to move. The focus adjustment ring 56 and the intermediate ring 55 of the lock screw 59 from the screw hole of the focus adjustment ring 56 after the focus adjustment. The adjustment state is maintained by tightening the screws.

As shown in FIG. 1 and FIG. 2, the screw tips are made to face the flat surfaces 21 and 22 of the flange portion 20 of the inner cylindrical body 19 through the screw holes of the outer cylindrical body 10. Two XY-axis adjusting screws 60, 61 and a spring lock screw 62 with its tip facing the circumferential surface are provided. The lock screw 62 is loosened, and the adjusting screw 60 is rotated to rotate the adjusting screw 60 to the flange portion at its tip. The flat surface 21 is pushed, and the optical fiber connection tube 31 is moved and adjusted integrally with the inner cylindrical body 19 in the Y axis direction within the recess gap 28 of the annular body 26, and the lens system 50 is adjusted in the same direction. At the same time, the flat surface 22 of the flange portion is pushed by the tip of the adjusting screw 61 through rotation, and the lens system 50 is similarly moved and adjusted in the X-axis direction. The lens system 50 is adjusted by these two adjusting screws 60 and 61. Adjustment in the XY axis directions After that, the adjusted state is maintained by tightening the spring lock screw 62.

Further, as shown in FIGS. 1 and 3, the small-diameter cylindrical portion 34 of the optical fiber connection pipe 31 is inserted through the screw holes of the cylindrical portion 23 of the outer cylindrical body 10 and the inner cylindrical body 19. Two tilt adjusting screws 63, 64 with their screw tips facing partially flat surfaces 35, 36 and a spring lock screw 65 with their screw tips facing the circumferential surface are provided. Through loosening and rotation of the tilt adjusting screw 63, a part of the flat surface 35 is pushed in the Y-axis direction by its tip, and in cooperation with this, the optical fiber connection tube 31 contacts the spherical concave surface 24 and the spherical convex surface 37. It is rotated clockwise about the surface as a fulcrum, and a part of the flat surface 36 is pushed in the X-axis direction by the tip of the adjusting screw 64 through the rotation, and the optical fiber connecting tube 31 moves in cooperation with this. Rotate counterclockwise around the spherical contact surface as a fulcrum. The tilting of the lens system 50 is adjusted by rotating these two adjusting screws 63 and 64, and this tilting adjustment state is maintained by tightening the spring lock screw 65.

In the above configuration, the optical fiber 66 is adjustably connected to the inner peripheral threaded portion 47 of the slightly smaller diameter portion 34 of the optical fiber connection tube 31 via the screwed connector 67, and the optical fiber 66 is also connected. A power meter 68 is connected to the end of the. Then, from this state, loosen the focus lock screw 59 and the spring lock screws 62 and 65, and adjust the XY axis adjustment screws 60 and 61, the focus ring 56, and the tilt adjustment screws 63 and 64 to obtain the values of the power meter 68, respectively. Is calculated, and all the screws 60, 61, 63, 64 are adjusted so that the output wattage of the laser light source 17 and the wattage of the power meter 68 match, and when the adjustment is completed, , The focus ring 56 is locked by tightening the lock screw 59, and the inner cylindrical body 19 and the optical fiber connecting tube 31 are locked by tightening the spring lock screws 62 and 63, respectively. The laser light emitted from the laser light source 17 enters the optical fiber 66 through the lens system 50 in a state where the center of the end face of the optical fiber 66 through the lens system 50 coincides.

[0013]

[Effect of device]

 Therefore, according to the present invention, the inner cylindrical body 19 is provided with the spherical concave surface 24, while the optical fiber connecting tube 31 is provided with the spherical convex surface 37 adapted to the spherical concave surface 24. The inner cylindrical body 19 and the optical fiber connection tube 31 are provided in an engaged state with the convex surface 37, and the lens system 50 is provided in the optical fiber connection tube 31 with its lens center aligned with the center of the spherical convex surface 37. Therefore, when the tilt adjustment screws 63 and 64 are used to adjust the tilt, the optical fiber connecting tube 31 smoothly rotates due to its spherical contact, and furthermore, the optical axis of the laser beam and the lens do not shake. The center of the end face of the optical fiber 66 via the system 50 can be matched.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an example of an apparatus according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 10 Outer tubular body 17 Laser light source 19 Inner cylindrical body 20 Flange portion 21, 22 Flat surface 23 Cylindrical portion 24 Spherical concave surface 26 Annular body 27 Recessed portion 31 Optical fiber connection tube 32 Large diameter cylindrical portion 33 Small diameter cylindrical portion 34 Small diameter cylindrical portion 35, 36 Partially flat surface 37 Spherical convex surface 50 Lens system 60, 61 XY axis adjustment screw 62 Spring lock screw 63, 64 Flange adjustment screw 65 Spring lock screw 66 Optical fiber C Lens center c Center of spherical convex surface

Claims (1)

[Scope of utility model registration request] 1. An outer cylindrical body on which a laser light source is mounted, a flange portion including two flat surfaces, and a cylindrical portion, and a spherical concave surface is formed on an opening surface on the flange portion side. An inner cylindrical body coaxially arranged in the outer cylindrical main body coaxially with the inner cylindrical body being movably inserted in a recess provided in the inner peripheral radial direction of the outer cylindrical main body, and a concentric large-diameter cylindrical portion. A spherical convex surface adapted to the spherical concave surface is formed on an outer peripheral step portion having a small diameter cylindrical portion and a small diameter cylindrical portion including two partially flat surfaces and formed by the large diameter cylindrical portion and the small diameter cylindrical portion. An optical fiber connecting tube having the spherical convex surface adapted to the spherical concave surface and having a small diameter cylindrical portion coaxially arranged in the inner cylinder, and a large diameter cylindrical portion of the optical fiber connecting cylinder, and A lens that is movably provided in the axial direction by aligning the center of the spherical convex surface with the center of the lens system. And the XY axis adjustment of the optical fiber connection tube with respect to the laser light source is performed through the adjusting operation of the tilt adjusting screw and the XY axis adjusting screw provided on the outer cylindrical body. To the optical fiber characterized in that the optical axis of the laser light emitted from the laser light source and the center of the end face of the optical fiber on which the laser light is incident through the lens system are aligned. Optical axis adjustment device for incident laser light.