JPH0816732B2 - Optical element module assembly method - Google Patents

Description

The present invention relates to a method for assembling an optical element module.

[Conventional technology]

Conventionally, as a method of assembling this kind of optical element module,
There were those shown in FIG. 3 and FIG.

FIG. 3 is a schematic view showing a state after the alignment of the optical element holder and the optical fiber holder by the conventional method for assembling the optical element module is completed, and FIG. 4 shows the optical element holder and the optical fiber holder which are joined by welding or the like. It is a schematic diagram showing the latter state. In the figure, (1) is an optical element, (2) is a light beam emitted from the optical element (1), (3) is a lens for condensing this light beam (2), and (4) is an external device. Optical fiber for interface, (5) is an optical element holder for holding the optical element (1) and the lens (3), (6)
Is a sleeve for holding the optical fiber (4), (7) is a fiber holder for holding the sleeve (6), (8)
Is an optical element holder holding metal fitting, and (9) is an optical fiber holding metal fitting attached to the fine movement table, which is movable in the optical axis direction. (10) indicates a weld bead.

 Next, the operation will be described.

The light beam (2) emitted from the optical element (1) is collected by the lens (3) and then coupled to the optical fiber (4) to be transmitted to an external device. Further, in order to obtain a good coupling efficiency, the end face of the optical fiber (4) is set to the above with respect to the converging point of the light beam (2) condensed by the lens (3) emitted from the optical element (1). Optical element (1) to optical fiber (4)
It was necessary to align and fix with sub-micron accuracy in the direction orthogonal to the optical axis to.

Therefore, in assembling this optical element module, first, the optical element holder holding metal fitting (8) and the optical fiber holder (8) are arranged so as not to tilt the joint surface between the optical element holder (5) and the optical fiber holder (7) as much as possible. The parallelism of the holding metal fitting (9) is sufficiently controlled, and the parallelism of the joint portion of the optical element holder (5) with the optical element holder holding metal fitting (8) and the joint portion with the optical fiber holder (7), and the light The squareness of the joint between the fiber holder (7) and the optical fiber holder holding metal fitting (9) and the joint between the optical element holder (5) are sufficiently controlled. After that, the lens (3) is emitted from the optical element (1).
The end face of the optical fiber (4) is aligned with the sub-micron accuracy in the direction perpendicular to the optical axis to the converging point of the light beam (2) condensed in (1). Further, from that state, the optical fiber holding metal fitting (9) is pressed in the optical axis direction, that is, toward the optical element holder holding metal (8), and a minute amount generated on the joint surface of the optical element holder (5) and the optical fiber holder (7). Remove the inclination and fix the joint surface by welding. In addition, (10)
Is a weld bead generated when fixed by welding.

[Problems to be Solved by the Invention]

Since the conventional method of assembling the module of the optical element is configured as described above, the parallelism between the joint surface of the optical element volta (5) and the optical fiber holder (7) and each holding jig, and The squareness must be processed with high accuracy, the parallelism between the holding jigs must be set so that the angle is as small as possible, and the optical fiber holder (7) must be set before the welding. There is a problem in that the components are expensive and require a great amount of assembly time, such as displacement of the focal point of the light beam (2) and the end face of the optical fiber (4) due to pressing against the element holder (5). .

The present invention has been made in order to solve the above problems, and an object thereof is to obtain an assembling method of an optical element module in which parts are inexpensive and assembling time is short.

[Means for solving the problem]

An optical element module assembling method according to the present invention is provided with an optical element holder or an optical fiber holder by providing a bonding surface in each of the optical element holder and the optical fiber holder in a direction orthogonal to an optical axis from the optical element to the optical fiber. A two-axis gimbal jig having two rotation center axes, one of which is orthogonal to each other in a plane parallel to the joint surface, and a brake that can be fixed to the rotation center axis at an arbitrary angle. The other side is held on a fine movement table which is movable in a direction orthogonal to the joint surface, and the joint surface is held parallel and held by the two-axis gimbal jig and fixedly assembled by welding or the like. It was done so.

[Action]

In the method of assembling the optical element module according to the present invention, the joint surfaces of the optical element holder and the optical fiber holder are aligned in parallel by a biaxial gimbal jig, and in that state, a brake provided on the rotary shaft of the biaxial gimbal jig is actuated. By holding the optical element holder while maintaining the parallelism of the joint surface with high accuracy, the parallelism and the squareness between the joint surface of the optical element holder and the optical fiber holder and each holder can be improved. The parallelism of the joint surfaces can be adjusted without high-precision processing, and the parallelism setting between the holding jigs is unnecessary.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described.

FIG. 1 is a schematic view showing a state after the alignment of the optical element holder and the optical fiber holder by the method for assembling the optical element module according to the present invention is completed, and FIG. 2 is joining the optical element holder and the optical fiber holder by welding or the like. It is the schematic which shows the state after doing. In the figure, (1) is an optical element, (2) is a light beam emitted from the optical element (1), (3) is a lens for condensing the light beam (2), (4) is an optical fiber, ( 5) is an optical element holder for holding the optical element (1) and the lens (3), (6) is a ferrule for holding the optical fiber (4), and (7) is an optical fiber via the ferrule (6). An optical fiber holder for holding (4),
(8) is an optical element holder holding jig which holds the optical element holder (5), (9) is an optical fiber holding jig which is provided on the fine movement table and holds the optical fiber holder (7),
It can be moved in the direction of the optical axis by a fine movement table.
(10) is a weld bead, (11) is the optical element holder (5)
A biaxial gimbal jig (12a) and (12b) having two orthogonal rotation center axes in a plane parallel to the joint surface between the light and the fiber holder (7) is the biaxial gimbal jig (11). Is a brake provided at each rotation center.

 Next, the operation will be described.

In this method of assembling the optical element module, when the joint surface between the optical element holder (5) and the optical fiber holder (7) is tilted, the optical fiber holder (7) is pressed against the optical element holder (5) to allow biaxial movement. The gimbal jig (11) removes the inclination of the joint surface, and in this state the brake (12
By operating a) and (12b), the rotary shaft of the biaxial gimbal jig (11) is fixed.

After that, the light beam (2) emitted from the optical element (1)
The optical fiber holding metal fitting (9) aligns and holds the end face of the optical fiber (4) at the position where the light is focused by the lens (3). Then, the joint surface of the optical element holder (5) and the optical fiber holder (7) is fixed by welding or the like.

In the above embodiment, the optical element (1) and the lens (3) are held by the optical element holder (5), the optical fiber (4) is held by the optical fiber holder (7) via the Ferni (6), The case where the optical element holder (5) and the optical fiber holder (7) are joined has been described, but the optical element (1)
The same effect can be obtained when the lens and the lens (3) are held by different holders and the holders are joined together. Furthermore, the same effect can be obtained when the optical element (1) is directly coupled to the optical fiber (4).

Further, in the above-described embodiment, the light emitting element is described as an example of the optical element (1), but a light receiving element also has the same effect.

〔The invention's effect〕

As described above, according to the present invention, the joint surfaces of the optical element holder and the optical file holder are aligned in parallel by the biaxial gimbal jig, and in that state, the brake provided on the rotary shaft of the biaxial gimbal jig is operated. Since the optical element holder can be held while maintaining the parallelism of the joint surface with high accuracy, the parallelism between the holding jigs of the optical element holder and the optical fiber holder and the joint surface, In addition, there is no need to control the squareness, the cost of parts is low, and there is an effect that an assembly method that is easy to assemble and requires less assembly time can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic view showing a state after completion of alignment of an optical element holder and an optical fiber holder by an optical element module assembling method according to an embodiment of the present invention, and FIG. 2 shows the optical element holder and the optical fiber holder. FIG. 3 is a schematic diagram showing a state after joining by welding or the like, FIG. 3 is a schematic diagram showing a state after completion of alignment between the optical element holder and the optical fiber holder by the conventional optical element module assembling method, and FIG. It is a schematic diagram showing the state after joining an optical element holder and an optical fiber holder by welding etc. In the figure, (1) is an optical element, (2) is a light beam,
(3) is a lens, (4) is an optical fiber, (5) is an optical element holder, (6) is a ferrule, (7) is an optical fiber holder, (8) is an optical element holding fitting, and (9) is an optical fiber holding Metal fittings, (10) is a welding bead, (11) is a biaxial gimbal jig, and (12a) and (12b) are brakes. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A method of assembling an optical element module, comprising an optical element, an optical element holder for holding the optical element, and an optical fiber holder for holding an optical fiber for interfacing with an external device as main components. The element holder and the optical fiber holder are each provided with a joint surface in a direction orthogonal to the optical axis from the optical element to the optical fiber.
Or, one of the optical fiber holders has two rotation center axes orthogonal to each other in a plane parallel to the above-mentioned joining surface,
Furthermore, this rotation center axis is mounted on a biaxial gimbal jig equipped with a brake that can be fixed at an arbitrary angle, and the other is held on a fine movement table that is movable in the direction orthogonal to the joint surface.
A method for assembling an optical element module, wherein the biaxial gimbal jig holds the joint surfaces in parallel and abuts them in a fixed state by welding or the like.