JPH06242352A - Optical fiber module - Google Patents

Abstract

PURPOSE:To make it possible to fix a sleeve to a holder on the barrel part of the sleeve by perforating plural hole parts penetrated from the outer periphery of the sleeve up to its inner periphery on the barrel part of the sleeve and fixing joint parts between the hole parts and the outer periphery of the holder by fillet welding. CONSTITUTION:The sleeve 16 for fixing the holder 12 on a case body 8 is formed like an approximate cylinder and the holder 12 is inserted into a hole opened along the axial direction. Plural hole parts 17 formed by perforating holes penetrated from the outer periphery up to the inner periphery are arranged on the barrel part of the sleeve 16 in the circumferential direction. The holder 12 is fixed to the sleeve 16 by inserting the holder 12 into the sleeve 16, executing the fillet welding of a joint part A between the end part of the sleeve 16 and the outer periphery of the holder 12 by a YAG laser or the like and executing the fillet welding of joint part B between the inner peripheral side edge parts of the sleeve 16 of respective hole parts 17 and the outer periphery of the holder 1..2 by the YAG laser or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an optical fiber module, and more particularly to a holder for holding an optical fiber,
The present invention relates to a structure of a joint portion between the holder and a sleeve that connects a housing that houses the light emitting element or the light receiving element.

[0002]

2. Description of the Related Art Conventionally, as a technique in such a field,
Various devices for optically coupling a light emitting element or a light receiving element and an optical fiber have been proposed and put into practical use. FIG. 2 is a cross-sectional view showing the structure of a conventional optical fiber module composed of a laser diode and an optical fiber.

In the figure, 1 is a laser diode, 2 is a heat sink for mounting the laser diode 1 and radiating heat generated by the laser diode 1, and 3 is the laser diode 1.
LD (laser diode) header to which the heat sink 2 is bonded and 4 are L to which the LD header 3 is attached.
It is a character-shaped support plate. The LD header 3 and the support plate 4 are fixed by soldering in order to improve heat dissipation.

Reference numeral 5 denotes a lens which is mounted in the vicinity of the laser diode 1 and converts the light emitted from the laser diode 1 into parallel beam light.
A lens holder 7 is attached by press-fitting or the like, and 7 is a sleeve for fixing the lens holder 6 to the support plate 4. The horizontal piece of the support plate 4 to which the lens holder 6 is attached has a diameter slightly larger than that of the lens holder 6. After adjusting the optical axes of the laser diode 1 and the lens 5, the lens holder 6 is welded and fixed to the horizontal piece of the support plate 4 by the sleeve 7 with a YAG laser or the like.

The support plate 4 is attached to the inside 8,
It is a case for protecting the laser diode 1, the lens 5 and the like fixed to the support plate 4. Reference numeral 9 is a lens that collects the parallel beam light and couples it with the optical fiber 10, 11 is a ferrule that fixes the optical fiber 10, and 12 is a cylindrical holder that holds the lens 9 and the ferrule 11.

Reference numeral 13 is a sleeve for fixing the holder 12 to the housing 8, and 14 is a step portion formed in the center of the body of the sleeve 13. The thickness is thin. FIG. 3 is an enlarged perspective view of a main part of an optical fiber module showing a conventional joint structure of the holder 12 and the sleeve 13. The holder 12 and the sleeve 13 are formed by inserting the holder 12 into the sleeve 13 and the end portion of the sleeve 13 and the holder 13. Overlap welding in which the joint portion A with the outer peripheral surface of 12 is fillet-welded with a YAG laser or the like, and the step portion 14 is melted with a YAG laser or the like to weld the inner peripheral surface of the step portion 14 and the outer peripheral surface of the sleeve 13. And then fixed.

Hereinafter, the integrated lens 9, optical fiber 10, ferrule 11, holder 12 and sleeve 13 are referred to as a collimator 15. This collimator 15
After adjusting the optical axes of the laser diode 1 and the optical fiber 10, the YAG is attached to the upper part of the housing 8 via the sleeve 13.
It is fixed by welding with a laser.

The conventional optical fiber module is constructed as described above. The light from the laser diode is converted by the lens 5 into parallel beam light, which is condensed by the lens 9 and condensed. The light was irradiated onto the optical fiber 10 and was optically coupled.

[0009]

However, in the above-mentioned conventional optical fiber module, when the holder 12 and the sleeve 13 are fixed, the joint portion A between the end portion of the sleeve 13 and the outer peripheral surface of the holder 12 is formed. Since it is possible to visually confirm the joining state by welding, it is possible to confirm whether or not it is securely fixed by welding. However, the inner peripheral surface of the stepped portion 14 formed on the body portion of the sleeve 13 and the outer peripheral surface of the holder 12 can be confirmed. However, there is a problem in that it is impossible to visually confirm whether or not the joint is securely fixed by welding, because the joint state by welding is not visible.

Further, due to the deviation of the clearance between the inner peripheral surface of the step portion 14 of the sleeve 13 and the outer peripheral surface of the holder 12,
There is a problem that only a part of the holder 12 in the circumferential direction is welded and fixed, and the other part is not welded, and the holder 12 is not reliably welded. As described above, since it is impossible to visually confirm the welding state and the structure may not be surely welded, there is a problem that reliability is lowered due to a shift of the optical axis and deterioration of performance.

The present invention has been made in order to solve such a problem, and makes it possible to visually confirm the welding state between the body of the sleeve and the holder, and securely welds and secures them to have high reliability. An object is to provide an optical fiber module.

[0012]

In order to achieve this object, the present invention provides a cylindrical holder for holding an optical fiber,
A cylindrical sleeve having a hole into which this holder is inserted,
In an optical fiber module containing a light emitting element or a light receiving element, and a housing connected to an optical fiber through the sleeve and a holder, in the body of the sleeve,
A plurality of holes are provided to penetrate from the outer peripheral surface to the inner peripheral surface of the sleeve, and the joint between the hole and the outer peripheral surface of the holder is fixed by welding.

[0013]

According to the present invention having the above-mentioned structure, the holder for holding the optical fiber and the sleeve for fixing the holder to the housing containing the light emitting element or the light receiving element are fixed to the body of the sleeve. This is performed by performing fillet welding at the joint between the provided hole and the outer peripheral surface of the holder.

[0014]

Embodiments Embodiments will be described below with reference to the drawings. FIG. 1 is an enlarged perspective view of a main part of an optical fiber module showing a joint structure of a holder and a sleeve according to an embodiment of the present invention. In the present embodiment, parts having the same configurations as those of the related art will be described with the same numbers.

Reference numeral 8 denotes a housing, in which the laser diode and the light emitted from the laser diode are converted into parallel beam light in the housing 8 as in the conventional optical fiber module described in FIG. A lens to be converted, an LD header for fixing these, a supporting member such as a lens holder and a supporting plate are housed to protect the laser diode and the lens.

Reference numeral 12 denotes a cylindrical holder, in which a lens for converging parallel beam light, an optical fiber, and this optical fiber are provided in the holder, similarly to the conventional optical fiber module described in FIG. The ferrule etc. that holds the is fixed. Reference numeral 16 denotes a sleeve for fixing the holder 12 to the housing 8, which is made of a metal such as Kovar or SUS304 and has a substantially cylindrical shape, and the holder 12 is inserted into a hole formed along the axial direction. 17 is this sleeve 16
A hole portion formed by making a hole penetrating from the outer peripheral surface to the inner peripheral surface in the body portion of the sleeve. A plurality of the hole portions 17 are provided in the body portion of the sleeve 16 in the circumferential direction.

To fix the holder 12 and the sleeve 16 having the above structure, the holder 12 is inserted into the sleeve 16 and the sleeve 1
The joint portion A between the end portion of 6 and the outer peripheral surface of the holder 12 is fillet welded with a YAG laser or the like, and the edge portion of each hole 17 on the inner peripheral surface side of the sleeve 16 and the outer peripheral surface of the holder 12 are joined. The part B is fillet welded with a YAG laser or the like. In this way, the hole portion 17 is provided in the body portion of the sleeve 16, and the hole portion 1
By performing fillet welding on the joint B between the outer peripheral surface of the holder 12 and the holder 12, reliable welding can be performed with the holder 12 at the location where the hole 17 is provided in the circumferential direction also in the body of the sleeve 16. , Hole part 17 and holder 12 by welding
It is possible to visually check the state of joining with the outer peripheral surface of, and it is possible to visually check whether or not they have been completely fixed by welding.

[0018]

As described above, according to the present invention, the body for the sleeve for fixing the holder for holding the optical fiber to the housing accommodating the light emitting element or the light receiving element is provided from the outer peripheral surface of the sleeve. Providing multiple holes that penetrate to the peripheral surface,
The joint between the hole and the outer peripheral surface of the holder is fixed by fillet welding.

As a result, there is an effect that the sleeve and the holder can be securely welded and fixed to each other in the body portion of the sleeve, and high reliability can be obtained. In addition, since the welding state can be visually confirmed, there is an effect that it is possible to easily inspect for a welding crack or a welding defect that causes deterioration of reliability.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of an essential part of an optical fiber module showing a joint structure of a holder and a sleeve according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of a conventional optical fiber module.

FIG. 3 is an enlarged perspective view of a main part of an optical fiber module showing a conventional joint structure of a holder and a sleeve.

[Explanation of symbols]

 12 Holder 16 Sleeve 17 Hole

Claims (1)

[Claims] 1. A cylindrical holder for holding an optical fiber, a cylindrical sleeve having a hole into which the holder is inserted, a light emitting element or a light receiving element, and an optical fiber via the sleeve and the holder. In an optical fiber module provided with a housing to be connected, a plurality of holes penetrating from the outer peripheral surface to the inner peripheral surface of the sleeve are provided in the body of the sleeve, and the hole and the outer peripheral surface of the holder are An optical fiber module in which a joint portion is fixed by welding.