JPS6332234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a microwave heating device in which a ladder portion is formed in the center conductor of a microstrip line. A conventional microwave heating device is formed of a microstrip line 1 as shown in FIG. 1, which will be explained below. In the figure, 2 is a dielectric substrate made of alumina ceramic or the like, and 3 is a grounding plate adhered to the bottom surface of this substrate 2. This grounding plate 3 is made of a conductive material such as silver or copper, and is connected to an outer conductor 5 of a coaxial cable 4 connected to one end of the microstrip line 1 . Reference numeral 6 denotes a center conductor in which a plurality of rectangular slits 7, which are long in the direction perpendicular to the microwave propagation direction, are formed and a ladder portion 8 is formed, which is also made of a conductive material such as silver or copper; It is attached to the upper surface of the substrate 2. This center conductor 6 is connected to the center conductor 9 of the coaxial cable 4. Reference numeral 10 denotes a dummy load connected to the other end of the microstrip line 1 , which consumes the microwaves that have not been completely consumed in the ladder section 8 without reflecting them. In this conventional example, when microwaves are supplied to the microstrip line 1 via the coaxial cable 4 , some of the radio waves leak from the ladder section 8, and a thin film scans on the ladder section 8 in the direction of the chain arrow. The object to be heated 11 is heated. Specifically, it was used for vulcanizing rubber films and fixing toner in electronic copying machines. However, in this conventional example, since the ladder portion 8 is exposed, there is a risk of sparks occurring between the slits 7. Moreover, since the ladder part 8 has unevenness formed on it, when the object to be heated 11 such as a copy paper or a rubber film is slid on the unevenness,
There was also the risk of getting hit and causing a jam. The present invention has been made in view of such conventional difficulties, and as shown in an embodiment shown in FIG. It is characterized in that it is coated with a substance 12 having the following properties. Note that the same parts as those in the conventional example are given the same drawing numbers and the description thereof will be omitted. Examples of the coating material 12 include silicone resin, fluororesin, glass, etc., but are not limited to these materials. Coating with these substances 12 prevents sparks between the slits 7 of the ladder section 8, and furthermore, the upper surface of the ladder section 8 becomes flat, preventing smooth scanning of the heated object 11 such as copy paper. It will not be done.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional example, and FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention. 1 ... Microstrip line, 8... Ladder section,
12...Coating substance.

Claims (1)

[Scope of Claims] 1. A microstrip line in which a ladder portion is formed in the center conductor, the ladder portion being coated with a material having a small tan δ value and a small permittivity, and having insulating properties and heat resistance. Features of microwave heating equipment. 2. The microwave heating device according to claim 1, wherein the coating material is a silicone resin. 3. The microwave heating device according to claim 1, wherein the coating material is a fluororesin. 4. The microwave heating device according to claim 1, wherein the coating material is glass.