JPH0329264A - One end sealed incandescent lamp - Google Patents

Abstract

PURPOSE:To prevent cloudy matter due to dipping liquid from remaining in the process of forming infrared reflection films in multi-layers by means of a dipping method by specifying the outer shape of a luminous tube. CONSTITUTION:A luminous tube 10 comprises a cone-like part provided with a straight tubular part 11, and a pinch seal part 12 and exhaust tube remaining part 13 at both ends of the straight tubular part 11. The connecting part between the straight tubular part 11 and the cone-like part is formed into a curve surface having a radius of curvature R. The radius of curvature R is set to be 5mm or more. Thus, the outer shape of the connecting part is formed into the smooth curve surface. With this arrangement, in the case of forming the infrared reflection films with the dipping method, since the dipping liquid is dropped while being smoothly slipped, the cloudy matter is never remained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a one-end sealed incandescent light bulb, and more specifically, a general incandescent light bulb in which a multilayer infrared reflective film is provided on the outer surface of an arc tube by a dipping method. The present invention relates to a one-end sealed incandescent light bulb suitable for lighting.

[Conventional technology]

In recent years, in one-end sealed incandescent light bulbs for general lighting, a multilayer infrared reflective film has been provided on the outer surface of the arc tube to cut infrared rays in order to prevent the surrounding temperature from rising. It is being said.

The vapor deposition method and the dipping method are known as methods for forming such a multilayer infrared reflective film, but the dipping method is preferable because the process is simple.

In this dipping method, an arc tube is immersed in a dipping liquid to form a coating film on the outer surface of the arc tube, this coating film is dried and fired to form a baked bottom layer, and this series of steps is repeated multiple times. Repeatedly forming a multilayer infrared reflective film on the outer surface of the arc tube.

[Problem to be solved by the invention]

However, conventionally, when the arc tube is immersed in a dipping liquid with the other end of the arc tube where the remaining exhaust pipe is located first, and then the arc tube is pulled up, the result is as shown in Fig. 2. In the curved part 14 that bends from the straight part 11 of the arc tube 10 toward the remaining part 13 of the exhaust pipe, a liquid pool is formed due to dripping of the dipping liquid, and this becomes cloudy through the subsequent drying and firing process. However, there is a problem in that a large powdery white turbid substance 30A remains. This cloudy substance 30
A has the problem that it peels off during lighting of an incandescent light bulb, and also causes deterioration of the aesthetic appearance, resulting in a reduction in commercial value.

The above problem similarly occurs when the arc tube 10 is immersed in the dipinder liquid with one end side where the pinch seal portion 12 is located first. That is, the same white turbidity as described above remains in the curved portion l5 that bends from the straight tubular portion 11 of the arc tube 10 toward the pinch seal R12.

One possible solution to this problem is to remove the white turbidity using chemicals, but this method has the problem of complicating the process because it increases the number of chemical treatment steps.

The present invention has been made based on the above-mentioned circumstances, and its purpose is to provide a light emitting tube with a beautiful appearance and high commercial value without leaving any cloudy matter caused by the pooling of dipinder liquid on the outer surface of the arc tube. An object of the present invention is to provide an incandescent light bulb with one end sealed.

[Means to solve the problem]

In the present invention, a filament is disposed along the tube axis of an arc tube having a straight tubular portion at the center, a Vinci seal portion at one end, and an exhaust pipe remainder at the other end, and a multilayer film is formed on the outer surface of the arc tube by a dipping method. A one-end sealed incandescent light bulb having an infrared reflecting film having a curved shape that bends from the straight tubular portion of the arc tube toward the pinch seal portion at one end and the remainder of the exhaust pipe at the other end. Minimum radius of curvature R in the part
is 5 mm or more.

[Effect]

Since the minimum radius of curvature R in the curved portion that bends from the straight tubular portion of the arc tube toward the pinch-rule portion at one end and the remaining portion of the exhaust pipe at the other end is 5 mm or more, the curved portion from the straight tubular portion of the arc tube to the one end The part leading to the other end is smooth and has no corners. Therefore, when forming a multilayer infrared reflective film using the dipping method, excess dipping liquid adhering to the outer surface of the arc tube is drained downward. The dipping liquid flows down smoothly, and the dipping liquid does not accumulate on the curved portion, and as a result, no white turbidity remains on the outer surface after drying and baking.

〔Example〕

Examples of the present invention will be described below.

In this embodiment, as shown in FIG. 1, in an arc tube 10 made of quartz glass or the like, from the central straight tubular portion 11 toward the pinch seal portion l2 at one end and the exhaust pipe remainder 13 at the other end. The minimum radius of curvature R of the bent curved portions l4 and l5 is set to 5 mm or more, and this arc tube I
An infrared reflective film 30 having a multilayer structure is formed on the outer surface of the O by a dipping method to construct a one-end sealed incandescent lamp for general lighting with a rating of, for example, IIOV, 80W.

Inside the arc tube 10, there is a filament 4 along the tube axis P.
A pair of metal foils 20 made of molybdenum are embedded in the pinch seal portion 12, and external leads 21 are connected to each of these metal foils 20. 50 is a glass piece for supporting the internal leads.

The multilayer infrared reflective film 30 can be formed, for example, as follows.

For example, starting from the other end of the arc tube 10 where the exhaust pipe remainder 13 is located, the portion of the arc tube 10 excluding the vinyl seal portion l2, that is, the other end and the straight tubular portion 1l, are made of titanium (
The arc tube 10 is then pulled up and the coating film formed on its outer surface is dried and burned to form a high refractive index burnt layer made of titanium oxide. form.

Next, using a dipinder liquid containing silicon (Si), the same operation as above is performed, and a layer made of silicon oxide is formed on the high refractive index burning bottom layer made of titanium oxide formed in the above process. It is formed by laminating fired layers with low refractive index.

By repeating the above steps, a high refractive index layer made of, for example, titanium oxide is formed into four layers, the first layer, the third layer, the fifth layer, and the seventh layer, in order from the arc tube 10 side. , the low refractive index burning bottom layer made of silicon oxide has four layers, the second layer, the fourth layer, the sixth layer, and the eighth layer, and the film thickness of each layer is 250 nm for the first layer to the seventh layer, The eighth layer forms an infrared reflective film 30 having a multilayer structure of 125r+m.

As described above, the minimum radius of curvature R in the curved portions l4 and l5 that bend from the straight tubular portion 11 of the arc tube 10 toward the pinch seal portion l2 on one end side and the remaining exhaust pipe portion l3 on the other end side is 5 mm or more. Therefore, the portions from the straight tubular portion 1l of the arc tube 10 to one end side and the other end side are smooth with no corners, and when forming the multilayer infrared reflective film 30 by the dipping method, the arc tube lO
The excess dipping liquid adhering to the outer surface smoothly flows downward, and there is no pooling of the dipping liquid in the curved parts 14 and 15, and as a result, no white turbidity remains on the outer surface after drying and firing. . Therefore, a one-end sealed incandescent lamp with a beautiful appearance and high commercial value can be obtained.

An embodiment of the present invention has been described above, but in the present invention, the front end of the arc tube 10 when immersed in the dipinder liquid may be on one end side where the pinch rule portion 12 is located. In this case, there is a problem of dipinder liquid pooling in the other curved portion 15 between the Vinci seal portion l2 and the straight tubular portion 11, but even in this curved portion 15, the minimum radius of curvature R is 5++or+ Because of the above, no pooling of dipinder liquid occurs in this curved portion l5, and the same effects as in the above embodiments are exhibited. In this case, it is important to mask the external leads 21 in advance so that the dipinder liquid does not adhere to the external leads 21 protruding from the pinch seal portion 12.

〔Effect of the invention〕

As described above, according to the present invention, there is no white turbidity remaining on the outer surface of the arc tube due to dipinder liquid accumulation, and a one-end sealed incandescent lamp with a beautiful appearance and high commercial value can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory sectional view showing an example of an incandescent light bulb with one end sealed according to the present invention, and FIG. 2 is an explanatory diagram showing problems with the conventional incandescent light bulb with one end sealed. 10... Arc tube 1l... Straight tubular part l
2...Pinch seal part l3...Exhaust pipe remaining part 14
．． 15... Curved portion 20... Gold rl4 foil 2
l...External lead 30...Multi-layered infrared reflective film - Figure 41

Claims (1)

[Claims] (1) A filament is arranged along the tube axis of an arc tube that has a straight tubular part in the center, a pinch seal part at one end, and the remainder of the exhaust pipe at the other end, and a multilayer structure is formed on the outer surface of the arc tube by a dipping method. A one-end sealed incandescent light bulb formed with an infrared reflective film, wherein the curved portion bends from the straight tubular portion of the arc tube toward the pinch seal portion at one end and the remainder of the exhaust pipe at the other end. The minimum radius of curvature R is 5
A one-end sealed incandescent light bulb characterized by having a diameter of mm or more.