JPH0769499B2 - 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 methods for assembling this type of optical element module, there have been methods shown in FIGS. 3 and 4.

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 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. An 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 an optical fiber holder for holding the sleeve, (8) is an optical element holder holding jig, (9) is an optical fiber holder holding jig, (10) Indicates a weld bead.

Next, the operation will be described.

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

Therefore, in assembling the optical element module, first, the optical element holder holding jig (8) and the optical element holder holding jig (8) are arranged so as not to tilt the joint surface of the optical element holder (5) and the optical fiber holder (7) as much as possible. The parallelism of the fiber holding jig (9) is sufficiently managed, and the perpendicularity of the joint between the optical element holder (5) and the optical element holder holding jig (8) and the joint between the optical fiber holder (7). , And the joint between the optical fiber holder (7) and the optical fiber holder holding jig (9) and the joint between the optical element holder (5) are sufficiently controlled. After that, the end face of the optical fiber (4) is aligned with the precision of the submicron in the direction perpendicular to the optical axis to the converging point of the light beam (2) emitted from the optical element (1) and condensed by the lens (3). . further,
From this state, the optical fiber holder holding jig (9) is pressed toward the optical element holder holding jig and the optical element holder (5) is pressed.
Then, the minute inclination generated on the joint surface of the optical fiber holder (7) is removed, and the joint surface is fixed by welding or the like.

In addition, (10) is the weld bead that occurs when it is fixed by welding.

[Problems to be Solved by the Invention]

Since the conventional method of assembling the optical element module is configured as described above, the squareness between the joint surface of the optical element holder (5) and the optical fiber holder (7) and each holding jig is highly accurate. It is necessary to set the parallelism between the holding jigs so that there is no angle as much as possible, and further before welding, the optical fiber holder (7) is used.
Since the light converging point of the light beam (2) and the end face of the optical fiber (4) are displaced by pressing the optical element holder (5) against the optical element holder (5), the parts are expensive and a great amount of assembly time is required. Atsuta

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 Problems]

The optical element module assembling method according to the present invention is provided with an optical element holder or an optical fiber holder in which a bonding surface is provided in each of the optical element holder and the optical fiber holder in a direction orthogonal to the optical axis from the optical element to the optical fiber. One of the two is mounted on a biaxial tilting fine movement table having a center of rotation on the joint surface, and the other is movable in the direction orthogonal to the joint surface, and a fine movement table equipped with means for detecting this movement amount. By holding the joint surfaces in parallel while holding them in contact with each other by controlling the biaxial tilt fine movement table by the movable amount detecting means, they are fixedly assembled by welding or the like.

[Action]

The method for assembling the optical element module according to the present invention is such that the optical fiber holder is pressed against the optical element holder by aligning the joint surfaces of the optical element holder and the optical fiber holder in parallel with a biaxial tilt fine movement table. It is possible to eliminate the positional deviation between the end face of the optical fiber and the optical fiber and to detect the parallelism of the above-mentioned joint surface by the amount of movement in the direction orthogonal to the above-mentioned joint surface of either the optical element holder or the optical fiber holder. It is possible to control, and by aligning the center of rotation of the biaxial tilting fine movement table with the joint surface, the relative displacement of the optical element holder and the optical fiber holder in the direction orthogonal to the optical axis due to the operation of the biaxial tilting fine movement table. Can be prevented.

〔Example〕

 An embodiment of the present invention will be described below.

FIG. 1 is a schematic view showing a state after the alignment of the optical element holder and the optical fiber by the method of assembling the optical element module according to the present invention is completed, and FIG. 2 is the optical element holder and the optical fiber holder 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 the light beam (2), (4) is an optical fiber,
(5) is an optical element holder that holds the optical element (1) and the lens (3), (6) is a ferrule that holds the optical fiber (4), and (7) is a light that passes through the ferrule (6). An optical fiber holder for holding the fiber (4), (8) an optical element holding jig for holding the optical element holder (5),
(9) is an optical fiber holding jig for holding the optical fiber holder (7), (10) is a welding bead, and (11) is rotated to the joining surface of the optical element holder (5) and the optical fiber holder (7). The tilting table A, (12) having a center, is a meter for detecting the amount of movement of the optical fiber holder, and (13) is tilting in a direction perpendicular to the tilting table A (11). It is the tilting fine movement table B that it has.

Next, the operation will be described.

In this method of assembling the optical element module, when the joint surface of the optical element holder (5) and the optical fiber holder (7) is tilted, the tilt of the optical element holder (5) is adjusted by the tilting fine movement table A (11). Then, the optical fiber holder (7) moves in accordance with the amount of inclination of the bonding surface while being in contact with the optical element holder (5) by its own weight. The amount of movement of the optical fiber holder (7) is detected by the meter (12), and the tilt fine movement table A (11) is fixed when the optical fiber holder (7) comes closest to the optical element holder (5). Similarly, the tilting fine movement table B (13) is adjusted in the direction perpendicular to the joint surface.

Then, the optical fiber (4) is placed at the position where the light beam (2) emitted from the optical element (1) is condensed by the lens (3).
The end face of the optical fiber is aligned and held by the optical fiber holding jig (9). After that, 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 ferrule (6), This optical element holder (5) and optical fiber holder (7)
Although the case where the optical element (1) and the lens (3) are held by different holders respectively and the holders are joined, the same effect is obtained. Furthermore, the same effect is 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 fiber holder are aligned in parallel by the biaxial tilt fine movement table,
Since the parallelism of the joint surface is detected by the amount of movement of one of the holders in the direction orthogonal to the joint surface, the center of rotation of the biaxial tilting fine movement table is aligned with the joint surface. Since there is no need to control the squareness between the holding jig and the bonding surface of each of the element holder and the optical fiber holder, the parts are inexpensive, and the assembly method is easy and the assembly time is short.

[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 the alignment of the optical element holder and the optical fiber holder by the conventional optical element module assembling method is completed, 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 jig, and (9) is an optical element. A fiber holding jig, (10) a welding bead, (11), (13) a tilting fine movement table, and (12) a meter. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A method for 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 optical element holder and the optical fiber holder each have a joining surface in the direction orthogonal to the optical axis from the optical element to the optical fiber, and either the optical element holder or the optical fiber holder is the center of rotation on the joining surface. Mounted on a two-axis tilting fine movement table having a movable body, the other side is movable in the direction orthogonal to the joint surface, and is held on a fine movement table equipped with means for detecting this movement amount. A method of assembling an optical element module, characterized in that the biaxial tilting fine movement table is controlled to fix and assemble the joint surfaces in parallel with each other by holding them in contact with each other.