JPH01235260A - Manufacture of cap for optical element - Google Patents

Abstract

PURPOSE:To obviate the need for pressing glass frit deposited on a cap body, by previously applying glass frit on glass board regions defined on a glass mother board, dividing the glass mother board into individual glass boards and fusion bonding each of the glass boards to the cap body. CONSTITUTION:Glass board regions 11 are defined on a glass mother board 10 and paste-type glass frit 12 is applied on one surface of each region 11 in substantially square pattern corresponding to the configurations of an aperture 7a of a cap body, and the glass frit is baked temporarily. The glass mother board 10 is turned upside down, expanded tape is affixed on the surface coated with the glass frit 12, and the glass mother board 10 is divided along the boundaries of the glass board regions 11. The expanded tape is then stretched so that the glass board 11 is divided into individual units. The glass board unit is put within the cap body 7 with the surface having the glass frit 12 facing down. The assembly is baked so that the glass board 11 is integrally bonded to the periphery of the aperture 7a of the cap body 7 by means of the molten glass frit 9.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing an optical element cap used for sealing a light emitting element or a light receiving element.

<Prior Art> Conventionally, a laser diode l having a structure as shown in FIG. 3 has been known as an example of an optical semiconductor element. This laser diode 1 includes a stem 3 on which a light emitting element 2 is mounted, a cap 4 that protects the light emitting element 2 by sealing it in an inert gas, and a lead connected to an electrode of the light emitting element 2. The terminal 5.6 passes through the stem 3 and is led out. This cap 4 includes a cap body 7 formed in a cylindrical shape having a closed end surface, and a circular glass plate 8 that covers and closes an opening 7a formed on the closed end surface from the inside with a glass frit 9. The laser light emitted from the light emitting element 2 is transmitted through the glass plate 8 and taken out to the outside. Note that the glass Fi, 8 is cut out and formed in advance into a circular shape corresponding to the inner diameter of the cap body 7 from a square glass plate.

By the way, such a cap 4 is manufactured by the following procedure. That is, first, the cap body 7 is arranged with its closed end face facing downward, and then the powdered glass frit 9 is supplied into the interior of the cap body 7 and is laminated around the open end 7a of the closed end face. . Then, a press is inserted into this cap body 7, and after pressing the glass frit 9 to form it flat, the glass frit 9 is pre-fired by preheating treatment. Next, a glass plate 8 is dropped into the inside of the cap body 7 and placed on the glass frit 9, and then heated and fired to melt the glass frit 9, and the glass plate 8 is passed through the glass frit 9 to the cap. The periphery of the opening 7a of the main body 7 and the glass plate 8 are integrally fused.

<Problems to be Solved by the Invention> However, the method for manufacturing the optical element cap has the following problems. That is, when the press is pulled up after pressing the glass frit 9, the glass frit 9 attached thereto may be partially removed, and "chips" may occur in the glass frit 9 after molding. When such a "chip" occurs, the inert gas that should be sealed by the cap 4 becomes "chipped".
It will be leaked to the outside through. Furthermore, since it is necessary to insert a press into each cap body 7 individually to press the glass frit 9, this press operation takes a lot of time and effort, making it difficult to improve manufacturing efficiency. be.

The present invention was devised in view of such conventional problems, and an object of the present invention is to provide a method for manufacturing an optical element cap that can simplify the manufacturing process and improve manufacturing efficiency.

Means for Solving the Problems> In order to solve the above problems, the present invention provides a method for manufacturing an optical element cap in which the inside of an opening formed in a cap body is closed with a glass plate. After setting many areas corresponding to the single glass plate on the mother plate,
A process of applying glass frit on one surface of these and pre-firing it, a process of dividing the glass mother plate along the glass fi 61 area and forming separate glass plates for each unit, and a process of applying glass frit to A cap for an optical device is manufactured by a step of bringing a glass plate into contact with a cap body, and then firing and fusing them together.

According to the above method, a glass frit is applied in advance to the glass plate area set on the glass mother plate, the glass plates are separated into individual glass plates, and then the glass plates are fused to the cap body via the glass frit. Therefore, unlike the conventional example, there is no need to perform a pressing operation to press the glass frit laminated on the cap body. Therefore, the manufacturing process of the optical element cap is simplified, and manufacturing efficiency can be improved.

<Example> Hereinafter, an example of the manufacturing method according to the present invention will be described by applying it to a laser diode as an optical element.

FIG. 1 is a perspective view showing a glass mother plate used in the present invention, and FIG. 2 is a plan view showing a single glass plate from the back side. Note that the structure of the laser diode as a final completed product is the same as that of the conventional example shown in FIG. 2 described above, so a description of the structure will be omitted.

In this example, first, a glass mother plate 10 made of borosilicate glass with anti-reflection coating on both sides as shown in FIG. 1 is prepared, and then on this glass mother plate 10,
A large number of areas are set in the shape of a base grid, each having a size corresponding to the inner diameter of the cap body 7 and corresponding to each of the glass plates 11 which are cut into a substantially square shape. Then, as shown in FIG. 2, a paste-like glass frit 12 is applied onto one surface of each of the glass plate ll areas set on the glass mother plate 10 by means of thick film printing, transfer, etc. to form the cap body 7. After applying the glass frit 12 in a substantially square shape corresponding to the shape of the opening 7a, the glass frit 12 is pre-fired by preheating treatment.

Next, the glass mother plate 10 is turned over and an expanded tape is pasted on the surface on which the glass frith H2 is formed, and the glass mother plate 10 is divided along the fJ region of the glass plate 11. The glass plate 11 is then stretched by stretching the expanded tape. Separate each unit.

Then, each glass plate 11 is removed from the expanding tape and dropped into the cap body 7 with the glass plate region 12 forming surface facing downward, thereby forming a connection between the glass frit 12 and the area around the opening 73 of the cap body 7. bring it into contact.

Further, these are fired by heat treatment, and the periphery of the opening 78 of the cap body 7 and the glass plate 11 are integrally fused via the molten glass frit 9. As a result, the cap 4 is constructed in which the cap body 7 and the glass plate 11 are in close contact with each other, thereby preventing inconveniences such as leakage of the inert gas to be sealed. The cap 4 manufactured in this way is then sent to the plating step after the next cleaning step, but the details of the processing in these steps are well known and will not be explained here.

In addition, in the above description, the shape of the glass plate 11 was explained as a substantially square shape, but if the glass plate is changed from a conventional circular shape to a substantially square shape in this way, it is necessary to take the trouble to shape the glass plate into a circular shape. This has the advantage of saving labor and improving manufacturing efficiency. The shape of the glass plate 11 is not limited to a substantially square shape, but may be any polygonal shape having a size corresponding to the inner diameter of the cap body 7.

Further, an opening 7 formed on the closed end surface of the cap body 7
It goes without saying that the shape of a is not limited to a substantially square shape, and may be circular, for example.Furthermore, in this embodiment, the present invention is applied to a laser diode. Although described above, it goes without saying that the present invention can be applied to other optical elements such as phototransistors.

<Effects of the Invention> As explained above, according to the present invention, after setting a large number of areas corresponding to individual glass plates on a glass base machine,
A process of applying glass frit on one surface of these and pre-firing it, and dividing the glass mother plate along the glass plate area,
A cap for an optical semiconductor element is manufactured by a process of forming separate glass plates for each unit, and a process of bringing the glass plate into contact with the cap body via a glass frit 7, and then baking and fusing them together. Since it is manufactured, like the conventional example,
There is no need to individually perform a press operation to press the laminated glass frit inside each cap body. Therefore, when manufacturing the cap for an optical element, the press work that requires a great deal of effort can be reduced, the manufacturing process can be simplified, and manufacturing efficiency can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 relate to an embodiment of the method of the present invention.
The figure is a perspective view showing a glass mother plate used in the present invention, and FIG. 2 is a plan view showing a single glass plate from the back side. Moreover, FIG. 3 is a sectional view showing the schematic structure of a laser diode as an optical element. The symbol l in the figure is a laser diode (optical device), 4 is a cap (optical device cap), 7 is a cap body, 7
a is the opening, 10 is a glass mother plate, 11 is a glass plate,
12 is a glass frit.

Claims (1)

[Claims] (1) A method for manufacturing an optical device cap in which the inside of an opening formed in a cap body is closed with a glass plate, the method comprising setting a number of regions corresponding to single glass plates on a glass mother plate. After that, a process of applying glass frit on one surface of these and pre-firing it, a process of dividing the glass mother plate along the glass plate area and forming separate glass plates for each unit, and a process of applying glass frit on one surface of the glass plate and pre-firing it. A method for manufacturing a cap for an optical device, which comprises the steps of: bringing a glass plate into contact with a cap body via a glass plate, and then firing and fusing the glass plate integrally.