JPH04130306A - Optical semiconductor element module - Google Patents

Abstract

PURPOSE:To prevent the optical axis misalignment between a lens and light emitting and receiving elements by engaging and fixing a fiber holder and element package having precision threaded parts in holders to both ends of a lens holder via the precision threaded parts likewise provided a both ends thereof. CONSTITUTION:The precision threaded part 12 for engaging and fixing is provided in the element package 1 and the precision threaded part 10 for engaging and fixing is also provided in one end of the lens holder 3. The element package 1 is mounted and fixed to the lens holder 3 by the engagement of these precision threaded parts 12, 10 with each other. Since the precision threaded parts 10, 12 are previously designed and engineered to be within the permissible error range, the need for the optical axis adjustment between the element package 1 and the lens holder 3 is eliminated at the time of the mounting and fixing. The element package 1 is thus easily mounted and fixed to the lens holder 3 with only the accuracy of the parts.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical semiconductor element module used for optical communication, optical applied measurement, etc. The present invention relates to an optical semiconductor element module in which a fiber holder and an element package are engaged and fixed without the need for optical axis adjustment.

[Prior Art] Conventionally, as an optical semiconductor element module of this type, the one described in Japanese Patent Application Laid-Open No. 1-289904 is known. FIG. 5 shows an optical semiconductor element module constructed in this manner. In this case,
The inside of one end of the element holder 54, which is constructed as a stainless steel cylindrical body and has a ball lens or a rond lens 56 attached thereto, is plated with solder, and the light emitting/receiving element 53 is connected through this solder plated part. is attached and fixed by solder 57. Thereafter, with the axis adjusted between the light emitting/receiving element 53 and the optical fiber 51, the element holder 54 and adjustment ring 55 and the adjustment ring 55 and fiber holder 52 are fixed by welding using a YAG laser. It is now possible to do so.

[Problem M to be solved by the invention] However, in the optical semiconductor element module configured as described above, the configuration is unnecessarily complicated, and this causes various problems in configuration and manufacturing. This causes problems.

That is, the solder material that fixes the emitting/light-receiving element and the element holder flows into the vicinity of the glass window cap of the emitting/light-receiving element, and as a result, the solder flux adheres to the glass window cap of the emitting/light-receiving element. ing. Also, depending on the variation in the plating range in the solder plating part provided inside one end of the element holder, the solder material may penetrate close to the lens, which causes solder flux to adhere within the effective lens diameter. ing. Furthermore, in addition to the above-mentioned problems, since the emitting/light-receiving element and the element holder do not come into direct contact with each other, that is, there is no reference surface for attaching the emitting/light-receiving element to the element holder, the emitting/light-receiving element may tilt. There is a high risk that the lens will be attached to the element holder in the wrong condition, and there is a problem that the optical axis between the lens and the light emitting/receiving element will be misaligned. Yet again.

Since the inside of one end of the element holder needs to be plated with solder, gold, or tin, it is necessary to mask the parts other than those to be plated to prevent plating from being applied. It has become something.

The purpose of the present invention is to simplify the structure, eliminate the need for masking processing, and prevent solder flux from adhering to the glass window cap or lens of the emitting/light-receiving element, as well as preventing solder flux from adhering to the glass window cap or lens between the lens and the emitting/receiving element. An object of the present invention is to provide an optical semiconductor element module in which optical axis deviation can be prevented.

[Means for Solving the Problem] The above object is achieved by engaging and fixing a fiber holder and an element package, which also have precision threads, to the holder through precision threads provided at each end of the lens holder. achieved.

[Function] An optical fiber with a connector attached to the other end and a fiber holder attached to one end, an element package containing an optical semiconductor element as a main component, and a lens attached inside. When the fiber holder and the element package are attached and fixed to both ends of the lens holder, the fiber holder and the element package are engaged and fixed through precision screw portions provided at each end of the lens holder.

Because it is precisely engaged and fixed through the precision screw part, it is suitable for optical coupling between the element package and the optical fiber.

This eliminates the need for optical axis adjustment. In addition, since the engagement and fixation are done without using solder material, even if these engagement and fixation parts are soldered later for the purpose of airtight sealing, solder flux is prevented from entering the inside of the module. It is something.

[Example] The present invention will be explained below with reference to FIGS. 1 to 4.

First, the optical semiconductor element module according to the present invention will be described. FIG. 1 is a cross-sectional view of the overall configuration of an example thereof, as shown in FIG.

The optical semiconductor element module is roughly divided into an element package 1 which has a light emitting/receiving element as its main component, and a lens which has a lens (ball lens or rond lens) 2 accommodated therein by press-fitting or soldering. An optical fiber 5 having a holder 3, a connector (not shown) attached to the other end, and a fiber holder 4 attached to one end.
It is composed of. In this case, the outer part of the element package 1, the lens holder 3, and the fiber holder 4
are made of weldable materials such as stainless steel, Kovar, and electromagnetic soft iron.

Specifically, the light emitting/light receiving elements constituting the element package 1 are laser diodes, light emitting diodes, photodiodes, phototransistors, avalanche photodiodes, etc., and the light emitting/light receiving elements are connected to the outside via package leads 6. It is now possible to do so. In FIG. 1, reference numeral 7 indicates a soldering portion, and reference numeral 9 indicates an optical fiber insertion hole.

FIGS. 2 and 3 also show detailed configurations of the element package and lens holder in that configuration, respectively. As shown in FIG. In addition, a precision threaded portion 10 for engagement and fixation is provided inside one end of the lens holder 3, and the engagement between these precision threaded portions 12 and 10 allows
The element package 1 is attached and fixed to a lens holder 3. Those precision screw parts IQ
, 12 are designed and manufactured in advance within the allowable error range, so when mounting and fixing, there is no need to adjust the optical axis between the element package lens holders 3, and the element package 1 can be easily aligned with the lens using only component precision. Holder 3
It can be attached and fixed to. At the time of mounting and fixing, the flange 1 provided on the element package 1
3 contacts one end surface of the lens holder 3 as a stopper, and if this contact portion is soldered as a soldering portion 7, an airtight seal can be easily achieved. Conventionally, when solder material penetrates inside the module,
Problems such as solder flux adhering to the glass window cap and lens of the light emitting/receiving element have occurred, but with the mounting and fixing structure described above, solder material can be reliably prevented from entering the module. It is something.

Now, the lens holder 3 is also provided with a precision threaded portion 11 at the other end, which is provided for engaging and fixing the fiber holder 4.

Although not shown in detail, the fiber holder 4 side is also provided with precision threaded parts to be engaged with it, and as in the previous case, these precision threaded parts are designed and manufactured in advance within the tolerance range. Therefore, when attaching and fixing, the fiber holder 4 can be easily attached and fixed to the lens holder 3 using only the precision of the parts, without the need for adjusting the optical axis between the fiber holder 4 and the lens holder 8.

When identifying the installation, the end face of the fiber boulder 4 comes into contact with the lens holder 3, but if this contact part is soldered as the soldering part 7, an airtight seal can be easily achieved. It is.

The optical fiber insertion hole 9 drilled in the fiber holder 4 is manufactured so that its coaxiality with the precision screw part provided in the fiber holder 4 is within a pre-designed tolerance range. The optical fiber 5 is fixed into the insertion hole 9 by press fitting.

FIG. 4 shows a partial cross section of another example of the optical semiconductor element module according to the present invention, centering on a fiber holder and a lens holder. As shown in the figure, the substantial configuration and circumstances are almost the same as those shown in FIG. By welding the contact portion as the welding portion 8, hermetic sealing can be easily performed.

[Effects of the Invention] As explained above, according to the present invention, the structure is simple, no masking process is required, and the generation of solder flux is reduced.
It is possible to obtain an optical semiconductor element module in which not only the attachment of the light-receiving element to the glass window cap and the lens is prevented, but also the deviation of the optical axis between the lens and the light-emitting/light-receiving element can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the overall configuration of an example of an optical semiconductor element module according to the present invention, and FIGS. 2 and 3 are views showing details of the element package and lens holder in that configuration, respectively. FIG. 4 is a cross-sectional view showing a partial configuration of another example of the optical semiconductor element module according to the present invention, and FIG. 5 is a diagram showing the configuration of an optical semiconductor element module according to the prior art. DESCRIPTION OF SYMBOLS 1... Element package, 2... Lens, 3... Lens holder, 4... Fiber holder, 5... Optical fiber, 7... Soldering part, 8... Welding part, 10 ，
11.12...Precision screw part. Figure 4! 150

Claims (1)

[Claims] 1. An optical fiber having a connector attached to the other end and a fiber holder attached to one end, an element package including an optical semiconductor element as a main component, the fiber holder, Attach and fix each element package,
An optical semiconductor element module consisting of a lens holder in which a lens is attached and housed, and a fiber holder and an element package are connected to the holder through precision threads provided at each end of the lens holder. No need for optical axis adjustment when optically coupling with optical fiber.
An optical semiconductor element module configured to be engaged and fixed. 2. With the fiber holder and the element package each engaged and fixed to the holder through the precision threaded parts provided at each end of the lens holder, each engagement fixing part is hermetically sealed by soldering or welding. Claim 1
The optical semiconductor element module described above. 3. The optical semiconductor according to claim 1, wherein the optical semiconductor element is a light emitting element or a light receiving element including at least a laser diode, a light emitting diode, a photodiode, a phototransistor, or an avalanche photodiode. element module.