JPH06318647A - Package for optical module and its manufacture - Google Patents

Abstract

PURPOSE:To easily manufacture a package with a sapphire window, for an optical module, to which a sapphire window can be attached so as to be sealed and bonded well at high quality. CONSTITUTION:A package for an optical module is formed in such a way that a light-transmitting window 14 composed mainly of alumina such as sapphire or the like has been sealed and bonded to a window part for a package body. In the package, a window component formed by brazing a metal ring 16 to the light-transmitting window 14 so as to sandwich a titanium ring 18 is sealed and bonded by brazing the metal ring 16 to a brazing face in the window part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical module package in which a light transmitting window is hermetically sealed and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a semiconductor laser device, an optical communication device, etc., an optical module package having a light transmitting window is used. Although this optical module package is formed by a metal holder, the light transmitting window needs to be hermetically sealed to the window portion of the package body, and various sealing methods have been proposed (Japanese Patent Publication No. 63- 47148, JP-A-62-29149
No. 1-214143).

As a light transmitting window used in a package for an optical module, one having alumina as a main component such as sapphire and one having silicon dioxide as a main component such as optical glass are mainly used. It is attached airtight by the wearing method. That is, in the case of a light-transmissive window containing sapphire as a main component, a method of preliminarily metallizing the sealing portion of the light-transmissive window and attaching it to the window of the package body by silver brazing or low melting point brazing Alternatively, there is a method of sealing a titanium member and a silver solder as a sealing member. When sealing a light-transmitting window such as optical glass, a metal oxide film is formed on the surface of the metal frame, and the light-transmitting window is sealed using low melting point glass. There is a method of sealing and a method of fusion using high frequency heating.

[0004]

However, the following problems have been encountered when using a light transmission window containing alumina such as sapphire as a main component. That is, when metallizing the light transmitting window, the metallized metal scatters and the window is contaminated. Since the glass fixing the leads to the package body is softened by the heating during silver brazing, the supporting jig for supporting the leads becomes complicated and the manufacturing cost of the jig increases. Since the package body is protected by plating after sealing the light transmission window, if the package body has a complicated shape, the plating solution may remain and stains may occur on the window, adversely affecting light transmission. give.

Incidentally, when the light transmissive window is sealed by low melting point brazing, there is the above problem, and when the titanium member and the silver solder are used as the sealing member, no metallization is applied and therefore the above problem. Although it does not occur, there are the above problems. The present invention has been made to solve these problems, and an object thereof is to provide a light-transmitting window in a window portion of a package body when a light-transmitting window containing alumina such as sapphire as a main component is used. The present invention aims to provide an optical module package that can be reliably sealed and can be obtained as a non-defective product with no contamination of the light transmission window, and a method for manufacturing the same.

[0006]

The present invention has the following constitution in order to achieve the above object. That is, in a package for an optical module, which is formed by sealing a light transmitting window mainly made of alumina such as sapphire to a window portion of a package body, a window formed by brazing a metal ring with a titanium ring sandwiched in the light transmitting window. The parts are sealed by brazing the metal ring to the brazing surface of the window. Further, in a method for manufacturing an optical module package, which is formed by sealing a light transmitting window mainly made of alumina such as sapphire to a window portion of a package body, a metal ring is brazed with a titanium ring sandwiched in the light transmitting window. Thus, a window component is produced, and the metal ring of the window component is brazed to the brazing surface of the window portion to seal the light transmitting window. Also, after applying the required plating to the window component,
The brazing surface of the window is brazed.

[0007]

The window component is formed by brazing a metal ring on a light transmitting window with a titanium ring sandwiched therebetween. The metal ring of this window component is brazed to the window portion of the package body to allow the package to transmit the light transmitting window. Seal. By sandwiching the titanium ring between the light transmitting window and the metal ring, the metal ring is directly brazed without metalizing the light transmitting window. The window component can be securely attached to the package by brazing the metal ring to the window portion of the package body. By subjecting the window component to necessary plating in advance, it is possible to prevent the light transmitting window from being contaminated in a later step, and it is possible to provide a product having excellent light transmitting characteristics and the like.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 3 shows an embodiment of the optical module package according to the present invention. The optical module package of the embodiment is a box-shaped package body 10
And a pipe portion 12 for attaching a light transmitting window attached to one side surface of the package body 10, a sapphire window 14 sealed as a light transmitting window in the pipe portion 12, and a lead 15 for external connection. There is. The sapphire window 14 is hermetically sealed at its peripheral edge in a storage hole provided in the end surface of the pipe portion 12.

In the optical module package of the embodiment, as a method of sealing the sapphire window 14 to the pipe portion 12,
First, braze the metal ring 16 to the sapphire window 14,
The sapphire window 14 to which the metal ring 16 is brazed is brazed to the pipe portion 12 for sealing. FIG. 2 shows a window component 21 in which the metal ring 16 is brazed to the sapphire window 14. The metal ring 16 is formed in a ring shape from a thin metal plate material according to the outer diameter size of the sapphire window 14. The material of the metal ring 16 is not particularly limited, and an appropriate material such as iron-cobalt-nickel alloy or iron-nickel alloy can be used.

When the metal ring 16 is brazed to the sapphire window 14, the conventional method of silver brazing using a titanium material is used. That is, a titanium ring 18 formed into a ring shape having substantially the same size as the metal ring 16 is prepared, and the titanium ring 18 is sandwiched between the metal ring 16 and the sapphire window 14 and brazed with silver to sapphire the metal ring 16. Brazing to the window 14. The silver brazing using this titanium material uses an active alloying method, and the titanium is diffused into the silver braze as well as into the sapphire window and is strongly bonded to oxygen in the sapphire. It is to be sealed to. Therefore,
With this method, it is not necessary to pre-metallize the sapphire window 14. Thus, the window component 21 in which the metal ring 16 is brazed to the sapphire window 14 by the silver brazing material 20 as shown in FIG. 2 is obtained.

The window part 21 having the metal ring 16 attached thereto is attached to the end face of the pipe portion 12 of the package body 10 by brazing at a temperature lower than that of silver brazing. Apply plating. In addition, as for the package side to which the light transmitting window is attached, the pipe portion 12 and the lead 1 are previously attached to the package body 10.
After attaching 5, the required plating is performed. Then, the window component 21 is brazed to the end face of the pipe portion 12 and sealed. As the brazing material used for brazing in this case, a low melting point brazing material such as gold-germanium, gold-tin, gold-silicon or solder is used.

FIG. 1 shows an enlarged view of the window component 21 brazed to the end face of the pipe portion 12. Since the metal ring 16 is previously brazed with silver on the window component 21, the window component 21 can be reliably sealed to the pipe portion 12 by the brazing material 22 via the metal ring 16. In this way, the sapphire window 14 can be reliably sealed to the window portion 23 of the package body 10. The brazing can be performed by heating on a heater block or by using a tunnel furnace.

In the case of the method of sealing the sapphire window 14 by the above method, since the brazing is performed at a low temperature, the window component 21 and the package body 10 are preliminarily plated and then brazed to obtain a product. can do. Since the window component 21 and the package body 10 can be separately plated in this way, it is not necessary to use a complicated jig for plating, and plating can be performed easily and reliably for each. There are advantages. Further, regarding the window component 21, by performing plating before brazing the pipe portion 12, it is possible to easily wash the plating solution and the like, and solve the problem that the plating solution remains on the sapphire window 14 to cause stains. There is also an advantage that you can.

Further, according to the method of the present embodiment, the titanium ring 18 can be used to eliminate the need for metallizing the sapphire window 14. Therefore, the problem that the metallized metal scatters and stains the sapphire window 14 is solved. There is also an advantage that the light transmittance of the sapphire window 14 is not impaired.

Further, in the optical module package of this embodiment, the metal ring 16 is sandwiched between the sapphire window 14 and the pipe portion 12 and brazed.
Has a cushioning effect between the pipe portion 12 and the sapphire window 14. Therefore, by appropriately selecting the shape, thickness, material and the like of the metal ring 16 according to the material of the package body 10, it is possible to reliably seal the metal ring 16 according to various materials. In this way, various materials can be used as the material of the package, and the range of application of the material of the package can be expanded. Further, the shape of the metal ring 16 is not limited to the circular shape, but can be an appropriate shape,
It is also possible to easily fit the light transmitting window in accordance with the shape of the mounting portion.

The above embodiment is shown as an example of an optical module package having a sapphire window attached, and FIGS. 4 and 5 show other embodiments of the optical module package. The embodiment shown in FIG. 4 is an example in which the mounting block 25 of the light transmitting window is brazed to the package body 10 by silver brazing, and the sapphire window 14 as the light transmitting window is sealed to the window portion of the mounting block 25. In the embodiment shown in FIG. 5, the package body 10 is provided with a window portion to which a light transmission window is attached, and an attachment portion 10a for sealing the light transmission window is provided on the outside of the window portion so that the attachment portion 10a is made of sapphire. This is an example in which the window 14 is sealed.
The method for sealing the sapphire window 14 in each of these embodiments is similar to the method according to the above-described embodiment. First, a window component is prepared by silver brazing the metal ring 16 to the sapphire window 14 through the titanium ring 18, and then forming the window component. Parts are brazed to the mounting block 25 or the mounting portion 10a by using a low melting point brazing material.

Also in the case of these embodiments, the optical module package having the light transmitting window can be easily and surely manufactured similarly to the above embodiments, the light transmitting window is not contaminated, and the light transmitting window is not polluted. It is possible to efficiently produce high-quality products such as having excellent light transmittance. The method of the present invention can be similarly applied to various types of packages such as a can type other than the above embodiment. Further, the manufacturing method according to the present invention can be applied to the manufacture of an optical module package having a light-transmitting window mainly made of alumina, in addition to the pure sapphire.

[0018]

As described above, according to the optical module package and the method of manufacturing the same of the present invention, it is possible to provide an optical module package product excellent in the sealing property of the light transmission window and the light transmission characteristics. In addition to being able to reliably manufacture high quality products, it is also possible to manufacture easily, and so on.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing a mounting portion of a light transmission window of an optical module package.

FIG. 2 is an explanatory diagram showing a configuration of a window component in which a metal ring is attached to a light transmitting window.

FIG. 3 is an explanatory diagram showing a configuration of an embodiment of an optical module package.

FIG. 4 is an explanatory diagram showing the configuration of another embodiment of the optical module package.

FIG. 5 is an explanatory diagram showing the configuration of still another embodiment of the optical module package.

[Explanation of symbols]

 10 Package Main Body 10a Mounting Part 12 Pipe Part 14 Sapphire Window 16 Metal Ring 18 Titanium Ring 20 Silver Brazing Material 21 Window Parts 22 Low Melting Point Brazing Material 23 Window Part 25 Mounting Block

Claims (3)

[Claims] 1. A package for an optical module, which is formed by sealing a light-transmitting window mainly made of alumina such as sapphire to a window portion of a package body, and brazing a metal ring with a titanium ring sandwiched in the light-transmitting window. An optical module package, wherein the window component formed by the above is sealed by brazing the metal ring to the brazing surface of the window portion. 2. A method of manufacturing a package for an optical module, which comprises sealing a light transmitting window mainly made of alumina such as sapphire to a window portion of a package body, wherein a metal ring is sandwiched between the light transmitting window and a titanium ring. A method for manufacturing a package for an optical module, characterized in that a window component is created by brazing, and the metal ring of the window component is brazed to a brazing surface of the window portion to seal a light transmitting window. . 3. After applying the required plating to the window component,
The method for manufacturing an optical module package according to claim 2, wherein brazing is performed on a brazing surface of the window portion.