JPS6355504A - Fixing and supporting structure for optical parts - Google Patents

Abstract

PURPOSE:To prevent the deviation of the optical axis of optical parts due to welding by notching a holding member, to which optical parts which have the optical axis adjusted are inserted and fixed, at both end parts and fixing optical parts to the holding member in a position, where the clearance between optical parts and the holding member is small, by welding. CONSTITUTION:Optical parts 21 are optically adjusted to the optical axis of an incident light P and are temporarily fixed in this position by a holding tool. A supporting plate 23 is slid on a substrate 24 and has a slope 23a tightly matched to the lower face of a holding member 22. After contacting surfaces among the holding member 22, the supporting plate 23, and the substrate 24 are matched to one another, a screw 25 is tightened to fix and integrate the holding member 22 and the supporting plate 23 on the substrate 24. After optical parts 21 are temporarily fixed to the holding member 22 by tightening screws 26 and 26, optical parts are fixed in stepped parts 28, which are formed by notching the holding member 22, by laser spot welding 29, thereby firmly fixing optical parts to the holding member 22.

Description

[Detailed Description of the Invention] Outline This is a fixed support structure for optical components after optical axis adjustment, in which a holding medium, ie, a holding rA' Cut out both ends of 4A in the optical component insertion direction from the end face of the holding member to approximately the center of the fitting hole provided in the holding member, and weld and fix the optical component exposed at this notched portion to the holding member. It is characterized by Since the clearance between the holding member and the optical component at the welded portion can be reduced, optical axis misalignment can be suppressed to a low level.

INDUSTRIAL APPLICATION FIELD The present invention relates to a fixed support structure for optical components after optical axis adjustment. In addition, in Kanmei 111, optical components refer to any IRT3
Refers to an optical component in which an optical element that receives light waves propagating through the medium (air, glass, etc.), or a light receiving optical coupling system element that loosely transmits and prevents the light waves from propagating after receiving the light waves, is arranged and fixed in a hollow rod.

In optical communication equipment, optical equipment, etc., optical multiplexers/demultiplexers,
Optical devices such as optical splitters/combiners, optical directional couplers, optical switches, and optical attenuators are often used. Such optical devices are generally equipped with optical components as described above,
It plays a role as a light receiving section for incident light or a transmitting section for output light.

Such an optical component is often constructed by, for example, a lens and an optical fiber being integrally arranged and fixed in a hollow rod body. However, in reality, the optical axis of the light wave (optical signal) that is incident on this optical component is almost never aligned with the optical axis of this optical component, and there may be some angular deviation or axis deviation. Normally, the light enters with a deviation component. These angular and axial deviations are natural! However, the increase in optical connection loss is a problem, especially in the case of angular misalignment, which has a devastating effect.

Furthermore, when single-mode optical fiber, which has been widely used recently, is used, its core diameter (approximately 10 μm) is much smaller than that of conventionally used multimode optical fiber (approximately 50 μm). , the influence of the angular deviation and axial deviation as described above increases. For this reason, this type of component has its optical axis aligned with the optical axis of the incident light.
It is then fixed and supported. Therefore, as a fixed support structure for this type of optical component, it is desirable that it be a fixed support structure that is easy to adjust and hardly causes angular or axial shift.

BACKGROUND OF THE INVENTION FIGS. 5 to 7 show conventional fixing and supporting structures for optical components. Reference numeral 10 indicates the entire fixing support structure for optical components, 11 is a light-receiving optical component, 12 is a holding member to the right of a fitting hole 13 into which the optical component 11 is inserted and fitted, and 14 is an upper surface formed with an inclined surface. Support plates 15 each indicate a substrate. Yu who adjusted the optical axis of optical component 11, optical component 11
is temporarily held by a holder (not shown). The optical component 11 temporarily held in this way is inserted into the fitting hole 13 of the holding member 12.
After fitting, the support plate 14 is adjusted appropriately and the holding member 12 and the support plate 14 are fixed to the base plate 15 by tightening the screws 16 and 17. Next, the optical component 11 is temporarily fixed by pressing it into the fitting hole 13 of the holding member 12 with the set screw 18, and then the optical component 11 is laser welded 19 on the upper part.
It is fixed to the holding member 12 by.

However, in the conventional fixed support structure for optical components as described above, there is always a clearance between the optical component 11 and the fitting hole 13 of the holding member 12, and this clearance is Since the optical component 11 is fixed to the holding member 12 by welding, the optical component 11 is slightly pulled upward.

Therefore, there was a problem in that the optical axis of the optical component 11 is shifted, and the loss of insertion into the fitting hole provided in the holding member 12 increases.

The present invention has been made in view of these points, and its purpose is to provide a fixing support for optical components that can fix optical components whose optical axes have been adjusted without causing optical axis deviations or angular deviations. It's about providing structure.

Means for Solving the Problems In order to solve the problems of the prior art described above, the present invention, as shown in FIG. 1 and FIG. , holding member 22. [An optical component in which a C notch 28 extends from the end surface to approximately the center of the fitting hole 27 provided in the holding member 22, and the optical component 21 exposed at this notch portion 28 is welded and fixed 29 to the holding member 22. Provides a fixed support structure.

Function: According to the optical component fixing support structure of the present invention as described above, the optical component 11 inserted into the fitting hole 27 and the holding member 22
Since the portion with a small clearance between the two is fixed by welding 29, fluctuations in the optical component due to thermal stress during welding can be suppressed to a small level. Therefore, the holding member 2
Optical component 21 when inserted and fixed into fitting hole 27 of No. 2
The optical axis deviation and flJ can be kept small.

Embodiments The present invention will be explained in detail below based on embodiments shown in the drawings.

1 to 4 show an embodiment of the optical component fixing support structure of the present invention, FIG. 1 is an enlarged view of the main part of the embodiment of the present invention, and FIG. 2 is a front view of FIG. 1. , FIG. 3 is a perspective view of an embodiment of the present invention, and FIG. 4 is a view taken from IV-IVI! of FIG. 3. A cross-sectional view is shown in each case.

In FIGS. 1 to 4, reference numeral 20 indicates the entire fixed support structure for optical components, 21 is a light-receiving optical component, 22 is a holding member, 23 is a support plate whose upper surface is formed as an inclined surface 23a,
24 is the board, 25 and 26 are the tightening parts. As shown in these figures, in this embodiment, a support plate 23 is slidably supported on an optical device board 24 such as an optical multiplexer/demultiplexer, and an inclined surface 23a of the support plate 23 is supported. A holding member 22 is slidably supported thereon;
The optical component 21 is rotatably fitted and held in the support member 22, and screws 25 and 26 are provided for tightening. Tighten the screw 25 with the holding member 22 as shown in Figure 4.
The tightening screws 26 are used to temporarily fix the optical component 21 to the holding member 22.

The holding portion 4422 is provided with a fitting hole 27, and the inner diameter of the fitting hole 27 is slightly larger than the outer diameter of the optical component 21.

Therefore, the optical component 21 is fitted into the fitting hole 27 in a self-turning manner. In addition, the holding member 22 and the support plate 23 are provided with insertion holes 22b and 23b, respectively, which are tightened with 25 screws (see FIG. 4). The inner diameter dimensions of these insertion holes 22b and 23b are formed to be larger than the outer diameter dimension of the screw 25 so as to have a preset play ([! range). Further, the inclined inner skin of the inclined surface 23a of the support plate 23 is also set to have a preset adjustment range. [The holding member 22, the support plate 23, and the substrate 24 are configured to abut each other in surface contact.

Furthermore, both ends of the holding member 22 in the insertion direction of the optical component 21 are cut out from the upper end surface of the holding member 22 to approximately the center of the fitting hole 27, forming a stepped portion 28°28. At this stepped portion 28, the optical component 21 temporarily fixed with the screw 26 is welded by laser spot welding 29 at four locations.
Fixed by

Fixed support of the optical component 21 by the fixed support structure 20 of this embodiment configured as described above is performed in the following manner.

First, loosen the screws 25 and 26 and install the external adjustment mechanism (
(not shown), the optical component 21 is optically adjusted (aligning both optical axes in a straight line) with respect to the optical axis of the incident light P, and a holder (not shown) is used to hold the optical component 21 in this position. Temporarily fix the supporting plate 23 on the substrate 24.
F! The slanted surface 23a of the holding member 22 is perfectly aligned with the lower surface of the holding member 22. At this time, the holding member 22 rotates in the circumferential direction of the optical component 21 according to the sliding movement of the support plate 23, and is moved to align with the inclined surface 23a of the support plate 23. In this way, the holding member 22, the support plate 23
, after the contact surfaces between each of the substrates 24 are aligned with each other,
Fasten the screws 25 and attach the holding member 22 and support plate 23 to the substrate 2.
4 - Immobilize the body.

Thereafter, the optical component 21 is temporarily fixed to the holding member 22 by tightening the screws 26 and 26, and then laser spot welding 29 is performed at the stepped portion 28 formed by cutting out the holding member 22, thereby attaching the optical component 21 to the holding member 22. 22 firmly fixed. In this example, as shown in 1v4,
The optical component 21 is attached to the holding member 22 by spot welding at four locations.
However, the number of spot welding locations is not limited to four, but may be selected as appropriate, such as two locations, one on each side, or six locations, three locations on each side. However, in order to suppress optical axis fluctuations of the optical component 21 due to welding as small as possible, the optical component 21 is fixed to the holding member 22 by spot welding at symmetrical positions on both sides with respect to the central axis of the optical component 21. It is preferable to stay in the room.

As clearly shown in FIG. 2, in this embodiment, the optical component 2 fitted into the fitting hole 27 of the holding member 22 is
1 and the holding member 22, the optical component 2 is covered due to welding.
The optical axis deviation of 1 can be suppressed to a very small value. This can be better understood when compared with the conventional optical component fixed support structure shown in FIG. That is, in the conventional structure shown in FIG. 7, the optical component 11 is fixed to the holding member 12 by spot welding at three locations at the upper end where the clearance is large. Since the optical component 11 is pulled upward and fixed during welding, it is difficult to suppress optical axis fluctuation of the optical component 11 to a small extent with this support structure.

After the fixation of the optical component 21 to the holding member 22 by spot welding 29 is completed, the temporary fixation of the screw 26 is released.

However, the temporary fixing of the screws 26 may be left as is. Further, by releasing the temporary fixation using a holder (not shown), the work of fixing and supporting the optical component 21 is completed.

In the embodiment described above, the holding member 22 and the support plate 23
However, it is fixed to the board 24 with screws 25,
The present invention is not limited to this, and for example, the holding member 22, the support plate 23, and the substrate 24 may be each fixed by welding.

With the fixed support structure of the above-described embodiment, the fluctuation of the optical axis of the optical component can be reduced to 1/10 of the conventional one.

Effects of the Invention As described above, the present invention has a structure in which a holding member for inserting and fixing an optical component whose optical axis has been adjusted is notched at both ends thereof, and the optical component is held in a place where there is a small clearance of 1 m between the optical component and the holding member. Since it is configured to be fixed to the holding member by welding, it is possible to significantly reduce the deviation of the optical axis of the optical component due to welding. Furthermore, since welding work can be performed at the notch, welding workability can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is an enlarged view of the main part of the embodiment of the present invention, Fig. 2 is a front view of Fig. 1, Fig. 3 is a perspective view of the embodiment of the present invention, and Fig. 4 is a cross section taken along the line rV-IV of Fig. 3. 5 is a schematic view of a conventional optical component fixing and supporting structure, FIG. 6 is an enlarged view of the main part of FIG. 5, and FIG. 7 is a front view of FIG. 6. 10.20... Optical component fixing support structure, 11.21.
...Optical component, 12.22...Holding member, 14.23...Support plate, 15.24...Substrate, 16.17.18.25.26...Tightening with screw, 13
．． 27...Fitting hole, 19.29...Suboc]/welding, 28...Step part (notch part). Figure 1 of the personal figure of a private person with the Honshin Ming Ogata begging example Figure 1 U6 Corridor 1 Figure crab side Figure 2 Figure 21: Map of the new government office where the main chain Ming So Chaos is present in Yumuqi Figure 3? q 21: 尤V, mockery 22; Section, i%'i;Ki;;)゛23; Inorai f) Suisei Keimi L Fig. 5 ■ = Optical Night Vulgar Fig. 6

Claims (1)

[Claims] An optical element that receives light waves propagated in any medium;
Alternatively, an optical component (
21) into a fitting hole (2) provided along the optical axis direction.
7) A holding member (22) that is inserted into the holding member (22) and rotatably held therein, the upper surface of which is formed into an inclined surface, and the holding member (22) is slidably supported on the inclined surface. a support plate (23) for adjusting the optical position of the optical component (21); and a substrate (2) that slidably supports the support plate (23) on its upper surface.
4), and the holding member (22) and the support plate (
23), in which both ends of the holding member (22) in the optical component insertion direction are fixed to each other in an integrated manner with the contact portions thereof being in surface contact with each other. A notch (28) is formed from the upper end surface to approximately the center of the fitting hole (27), and the optical component (21) exposed at the notch portion (28) is welded and fixed to the holding member (22). Features a fixed support structure for optical components.