JPH0425808Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an infrared light bulb used as a heat source for heating, drying, etc.

[Prior art]

Conventionally, in order to heat efficiently, for example,
Jitsukō 26-2682, Jitsukō 27-1673, Jitsukō 27-
4878, heat-generating light bulbs in which a heating wire such as a nichrome wire is sealed in a vacuum state in a glass bulb are often used.

[Problem that the invention attempts to solve]

However, in the above-mentioned heat-generating light bulb, the heating wire must be wound around a heat-resistant and insulating holding member such as a porcelain mica plate, and then the holding member must be integrated to be supported by a stem. Not only did it have a complicated structure and was difficult to assemble, but it also had the major drawbacks of being vulnerable to vibrations and shocks, and emitting little infrared radiation, which has high radiation efficiency.

This method had the inconvenience of having to vacuum seal the inside of the bulb to a pressure of at least 1×10 ^-2 torr to prevent oxidation of the heating wire.

[Means for solving problems]

In view of the above-mentioned problems of the prior art, the present invention is characterized in that a ceramic heat source having a heat generating resistor embedded in a ceramic body with excellent infrared radiation characteristics is enclosed in a glass bulb.

〔Example〕

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

In FIG. 1, reference numeral 1 indicates an infrared light bulb, a ceramic heat generating source 3 is enclosed in a glass bulb 2 supported by a stem 4, and a lead wire for energizing the ceramic heat generating source 3 is connected to the stem 4. It is connected to the bases 5 and 6 through the inside.

By the way, as shown in FIG. 2, which is a perspective view of the ceramic heat generating source 3 enclosed in the bulb 2 in the middle of the manufacturing process, powder of tungsten, molybdenum, etc. is applied to the outer surface of the ceramic core 3a. After wrapping a raw ceramic sheet 3c with a heating resistor 3a formed by applying conductive paste using a printing method, the raw ceramic sheet 3c is sintered and integrated, and lead wires are attached to the exposed ends of the heating resistor 3b. The ceramic heat generating source 3 is manufactured by brazing (not shown). In addition, as shown in FIG. 3, wires made of a high melting point metal such as tungsten or molybdenum may be embedded between unfired ceramic bodies 3d as heating resistors 3e and sintered into one piece. can.

In this way, for example, the ceramic (raw) constituting at least the surface portion of the ceramic heat source 3
The sheet 3c and the ceramic body 3d are made of a ceramic selected from conventionally known cordierite, mullite, aluminum titanate, β-spodium, zircon, silicon carbide, titania, and the like. Alternatively, in the case of a heating element made of alumina, silicon nitride ceramic, etc., the surface may be coated with a ceramic material having excellent infrared radiation characteristics as described above.

Ceramic materials with such excellent infrared radiation characteristics emit infrared rays with wavelengths of 1 to 10 μm with high heating efficiency when heated to a temperature in the range of 300 to 1000°C.

The ceramic heat source 3 as described above is shown in FIGS. 2 and 3.
The shape is not limited to the cylindrical or prismatic shape shown in the figure, but may be flat or spherical. Also, the heat generating resistors 3b and 3e in the ceramic heat source are buried in the ceramics 3c and 3d, and the outside air is If it is sealed in the bulb 2 without the risk of oxidation because it is in a shut-off state, there are no particular restrictions on the atmosphere inside the bulb 2, but due to thermal expansion, etc., it may be in a slight vacuum state. It is desirable to keep it.

Next, as an embodiment of the present invention, an infrared bulb 1 in which a ceramic heat source 3 made of cordierite ceramic is enclosed in a bulb 2 and an infrared bulb 1 in which a conventional nichrome wire is enclosed as a heat generating element are tested under the same conditions. A piece of black neoprene rubber was placed 80 mm away from the opposite side of the heat generating part, and its temperature rise characteristics were measured. The results are shown in the graph of FIG.

According to this, it was confirmed that the infrared light bulb according to the present invention has a high heating effect, as it can raise the temperature more quickly and to a higher temperature than the conventional one.

[Effect of idea]

As described above, according to the present invention, a ceramic heat generating source having a heat generating resistor embedded in a ceramic material having at least the surface portion made of cordierite, mullite ceramic, etc. having excellent infrared radiation characteristics is enclosed in a bulb. As the number of components is small, the assembly time is drastically reduced, and since the heating resistor is embedded in the ceramic material and is isolated from the outside air, it does not oxidize, and therefore the resistance value changes. Since the amount of heat generated is small, an infrared light bulb with stable heat generation characteristics can be produced. In addition, since there is no need to perform vacuum treatment on the inside of the valve, the manufacturing process that requires large-scale vacuum equipment can be simplified, and since there is no vacuum inside the valve, the risk of valve damage is reduced. It has an effect.

[Brief explanation of the drawing]

FIG. 1 is a side view of an infrared light bulb according to an embodiment of the present invention, and FIGS. 2 and 3 are perspective views in the middle of the manufacturing process of a ceramic heat source constituting an infrared light bulb according to an embodiment of the present invention. FIG. 4 is a graph of the heating temperature characteristics of the infrared light bulb according to the embodiment of the present invention and the conventional infrared light bulb. 1...Infrared light bulb, 2...Bulb, 3...Ceramic heat source.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A ceramic heat generating source made of a high melting point metal such as tungsten or molybdenum is embedded in a ceramic body, and a ceramic heat generating source is encapsulated in a glass bulb, and the above heat generation is An infrared light bulb with a base attached to the bulb to energize the resistor. (2) A request for utility model registration in which at least the surface portion of the ceramic heat source is made of a ceramic with excellent infrared radiation characteristics selected from cordierite, mullite, aluminum titanate, β-spodium, zircon, alumina, titania, etc. The infrared light bulb according to item 1.