JPS6142969A - Structure with photo transmission window - Google Patents

Abstract

PURPOSE:To prevent light loss by eliminating the deposits of glass fragments and the like on the glass surface, and removing light, by a method wherein the peripheral edge of a photo transmission window glass is formed into a fused plane by heating. CONSTITUTION:The peripheral edge of the photo transmission window glass 34 is formed into a fused plane by heating. For example, a glass raw material is fused into a plate glass and coated as required; thereafter, a plurality of pieces are laminated by being solidified with resin. Next, this is cut in prismatic form with a cutter, and then processed in cylindrical form with a lathe. Then, a disk glass 34 is obtained by fusing the resin with an organic flux. This disk glass 34 is placed on the tip of an adsorption rod 36 and held by suction under air pressure. While the adsorption rod 36 is rotated, the top of the burner 40 flame which has been adjusted as fine as possible is put to the processed surface of the disk glass 34; thus, the cleavage surface is formed into a softened fused plane by glass fusion. The disk glass thus formed is used as the photo transmission window glass.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure with a light-transmitting window, and more particularly, the peripheral edge of the light-transmitting window glass disposed on the light passage path is heated to soften and melt. The present invention relates to a structure with a window for light transmission, which can solve the problem of glass pieces peeling off and adhering to the glass surface, which sometimes occurs when glass pieces are peeled off and sticking to the glass surface, and which does not impede the characteristics of semiconductor elements or the like.

In a semiconductor device equipped with a light emitting element and a light receiving element such as a laser diode and a photodiode, as shown in FIG. It's sealed. In order to suppress light loss as much as possible, the light transmitting window glass 10 that allows the light to pass through is required to have a completely clean surface without the slightest amount of dust or the like adhering to it.

A conventional manufacturing method for light transmitting window glass will be explained.

(11 Raw materials are heated and melted to make plate glass.

(2) Various coatings are applied to obtain the required transmittance.

(3) Next, process it into a predetermined shape. This processing method includes the following.

B. Punch out with a press.

Cut with a cutter, diamond cutter, etc.

C. Multiple plates of glass are hardened with resin and laminated, and the laminated glass is cut into cylinders or squares and finished using a lathe.

2. Cut by laser beam.

However, in the case of the processing according to A, B, and C above, since the processing is mechanical processing, the processed surface forms a shell-like interfold surface. In addition, in the case of machining according to the above-mentioned method 2, countless micro-cranks are generated around the machined part. During handling, such as when sealing the light-transmitting window glass 10 with the cap 12 using low-melting glass, the processed surface where such creases or microcracks have occurred may be removed.
Due to contact between pieces of glass, contact with a jig, contact with tweezers, etc., minute pieces of glass fall out between the folds and adhere to the glass surface.

The glass fragments generated here vary from 1 μm to 100 μm, and glass fragments of 30 μm or larger attached to the glass surface can be removed by cleaning, air blowing, etc.
There is no suitable removal method for particles with a diameter of 0 μm or less, which causes a problem of light loss when used as a light-transmitting window glass.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a structure with a light transmission window that is free from adhesion such as glass fragments on the glass surface and can prevent light loss as much as possible. The feature is that in a structure with a light transmitting window such as a semiconductor device equipped with a light emitting element 1 light receiving element, etc. and having a light transmitting window glass on the light passage path, the peripheral edge of the light transmitting window glass is heat-treated. It is located on the molten surface formed by

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows an outline of a semiconductor laser device as an embodiment of the structure with a window for light transmission according to the present invention.

20 is an eyelet (metallic outer ring), 22 is a light-receiving semiconductor element, 24 is a laser element, and 26 is a lead wire.

A cap 28 is fixed to cover the upper surface of the eyelet 20, and hermetically seals the light-receiving semiconductor element 22 and the laser element 24.

A light transmitting window glass 30 is hermetically sealed in the upper opening of the cap 28 with a low melting point glass 32 .

A feature of the present invention is that the peripheral edge of the above-mentioned light-transmitting window glass 30 is formed into a melted surface by heat treatment.

An example of the manufacturing process of the light transmitting window glass 30 is shown below.

First, glass raw materials are melted, formed into sheet glass, coated with a predetermined coating, solidified with resin, and laminated into multiple sheets. Next, this is cut into a prismatic shape using an appropriate cutter, and then processed into a cylindrical shape using a lathe. Next, the resin is dissolved using an organic solvent to obtain a disk-shaped glass 34 as shown in FIG. Since this disk-shaped glass 34 has undergone a mechanical processing process, its processed surface, which is the peripheral edge, is a shell-like interfold surface, which is the same as in the prior art.

Next, the disk-shaped glass 34 is attached to a suction rod 36 shown in FIG.
Place it on the tip. The suction rod 36 suctions and holds the disk-shaped glass 34 using air pressure. Note that 38 is an adsorption band.

Next, while rotating the suction rod 36, the tip of the flame of the burner 40, which has been adjusted to be as fine as possible, is applied to the processed surface of the disk-shaped glass 34, melting the glass and forming a folded surface into a softened and melted surface. . The disk-shaped window glass formed in this way is used as the light transmission window glass 30. Note that the flame of the burner 40 needs to be applied only to the peripheral processed surface in order not to cause distortion on the glass surface. Alternatively, the disk-shaped glass 34 may be fixed and the burner 40 may be rotated by an appropriate mechanism.

It goes without saying that the light-transmitting window glass may have a rectangular shape, for example, instead of a disk shape.

Further, the manufacturing method is not limited to the above, and for example, as the heating means, electric means or other appropriate means may be employed.

Furthermore, although the above description has been made regarding a semiconductor laser device in which the light transmitting window glass 30 is hermetically sealed in the cap 28, the present invention is not limited to this, and for example, a semiconductor laser device in which the light transmitting window glass 30 is incorporated inside the device. The present invention can also be applied to devices in the field of optical communication, etc., in which a light-transmitting window glass is installed at a necessary position.

As described above, according to the structure with a light transmission window according to the present invention,
Because the processed surface of the light-transmitting window glass is heated and formed into a molten surface, there is the problem that glass pieces fall off from the cracked surface or micro-crank part of the processed surface and adhere to the glass surface, as in the past. Since the glass surface can always be kept completely clean, there is no light loss and it is possible to provide a structure with a light transmission window that meets the strict requirements of the industry.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a cap of a semiconductor device, FIG. 2 is a sectional view showing an outline of a semiconductor laser device as an example of a structure with a window for light transmission, FIG. 3 is a perspective view of a disk-shaped glass, and FIG. The figure is an explanatory view of the process of applying burner flame to the processed surface of a disk-shaped glass to soften and melt the surface. DESCRIPTION OF SYMBOLS 10... Window glass for light transmission, 12... Cap, 20... Eyelet 22... Light receiving semiconductor element, 24... Laser element. 26...Lead wire, 28...Cap. 30... Window glass for light transmission, 32... Low melting point glass, 34... Disc shaped glass, 36... Suction rod, 38... Suction pad, 40... Burner.

Claims (1)

[Claims] 1. In a structure with a light-transmitting window such as a semiconductor device that is equipped with a light-emitting element, a light-receiving element, etc. and has a light-transmitting window glass on the light passage path, the peripheral edge of the light-transmitting window glass is heated. A structure with a light transmission window, characterized in that it is formed on a molten surface.