JPS59189579A - Panel heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet heating element, and more particularly to a circular sheet heating element that generates heat uniformly and is suitable for heating low frequency treatment devices and anti-glare mirrors. Involved. For example, low-frequency therapy devices use a pair of electrodes called conductive elements that are placed in close contact with the skin near areas of the body that are harmful to health or cause pain, and transmit minute upstream waves such as low-frequency pulse waves or sawtooth waves into the interior of the body. It improves blood circulation and improves treatment. The conductive element ('!, used in this treatment device) needs to be attached with a sponge soaked in water in order to reduce the contact resistance when it comes into contact with the body. The sponge part that contains water feels cold,
There were problems especially when using it in winter. In order to improve this corridor, it was necessary to incorporate a heater into the conductor element to heat it, but the temperature range at which the human body feels comfortable is 40 to 40.
3 °C and non-narrow range before, and the total iI of the conductive element
I] had to generate heat uniformly within this narrow temperature range.

This four-point heating element for a low-frequency treatment device that can be heated incorporates a rectangular planar @heating element that has existed in the past and is said to generate heat uniformly.
Naturally, the electronic elements had to be square. However, even if a rectangular planar heating element, which is said to generate heat uniformly, is used, it is not sufficient to heat with high uniformity in a narrow temperature range, such as that required as a heat source for a low-frequency treatment device. I wasn't satisfied.

The present inventors have achieved a circular sheet heating element that heats in a narrow temperature range and with high uniformity by using a circular sheet heating element in which a uniquely shaped heating circuit is arranged. Based on this knowledge, we have completed the planar heating element of the present invention.

That is, in the present invention, circular or circumferential electrodes are arranged at the center portion and the outer peripheral portion of a disk-shaped or hollow disk-shaped insulating substrate, and a constant interval at actual temperature is maintained between the two electrodes. Both row sides of the planar heating element in which a plurality of spiral heating circuits of the same width are formed are coated with an electrical insulating material having water resistance and heat resistance, and conductive wires from both electrodes are covered. are circular planar heating elements that are made to penetrate through the coating layer, respectively.

The insulating substrate of the planar heating element used in the present invention is not limited in percentage as long as it is made of a material that has high electrical insulation, heat resistance, and is resistant to cracking. An insulating board that is commonly commercially available for practical use, such as a ceramic board with a thickness of 1.6 mm or more or a thickness of 250 mm or more.
A mica plate of about 350 μm is preferably used.

Is the shape of the insulating substrate circular? It is a hollow disc with a small circular hole in the center that is concentric with the circle around the outer circle.

The electrodes are formed by pasting metal foil, or by printing or adhering metal powder or paste.

Further, the shape of the heating circuit is made to match n trajectories shown by the following polar coordinate equation, and is sparse in the center and dense in the outer periphery.

That is, 2π r, - person
In the above formula, -L and n are respectively determined by the set resistance value and surface temperature distribution of the planar heating element, but in the present invention, A usually ranges from 1 to 5 and n ranges from about 10 to 50.

The -1 heating circuit is formed, for example, by printing carbon-based conductive ink or metal powder-based conductive ink on an insulating substrate. Screen printing is usually employed as a printing means for forming electrodes and heat generating circuits.

A conductor connection terminal is attached to each electrode in the center portion and the outer peripheral portion. Although there are no particular restrictions on the positions for attaching the conductor connection terminals, it is preferable to place the two terminals as close to each other as possible, since only one portion is required to penetrate the coating layer.

The electric insulator that covers the planar heating element is usually made of glass cloth or the like. , silicone face, silicone-7RTV rubber, BT-resin (Mitsubishi Gas Chemical Exhibition), etc. are impregnated into glass cloth pre-pre-knobs.

A planar heating element element is embedded in this resin-impregnated glass cloth pre-prepared lugs, and a coating layer is formed by heating and pressure molding. At this time, this glass cloth was used to further improve the electrical insulation performance.

A film with good adhesiveness of each repreg is adhered to the outermost surface of the repreg in contact with the surface heating element. Examples of this film include a laminated film of nylon and Surlyn (a product of Chipon Co., Ltd.), a vinylidene chloride film, and a polyester film.

For example, a conductor whose one end is fixed to a conductor connection terminal with solder or the like is forced to pass through the cover layer.This penetrating portion is sealed and insulated using conventional methods to prevent water, moisture, etc. from entering from the N. This sealing and insulation treatment is achieved by filling a synthetic resin cap such as chlorinated polyethylene with a botting resin such as a botting epoxy resin or a botting silicone resin, and then curing the cap. This sealing and insulating treatment can be carried out during the manufacture of the sheet heating element as described above, but it is also useful when incorporating it into a conductive element of a low frequency treatment device or an anti-fog mirror, etc. You can also do it.

The present invention will be explained in more detail with reference to the drawings.

Figures 1 and 2 are a partially cutaway plan view and a partially cutaway bottom view of a circular planar heating element that uses a hollow disc-shaped insulating substrate and has one conductor penetration portion in the covering layer. FIG. 3 shows electrodes 3 and 3 on the center and outer circumferential parts of the surface of the hollow disk-shaped insulating substrate 2, which is shown in A-A' of the planar heating element shown in FIGS. 1 and 2. A plurality of spiral heating circuits 5.4 are arranged at substantially constant intervals between the electrodes 3 and 40 and have substantially equal widths. ...
. . . , 5 are formed to form a planar heating element cord 9. It is said that In this heat generating circuit, in the above general formula, A, x and n are respectively attached to electrodes 3 and 4, and lead wire connection terminals 7 and 8 are added on the same radius. In addition,
The wire connecting terminals 7 and 8 extend toward the other electrode, and their tips are brought close to each other, and conductor wires 9, 9 are connected to the tips.

Both sides of the planar heating element 6 are covered with a laminated layer ILI, 10 of an electrical insulating material, except for the conductor connection terminal portions. A cap 11 is fixed to the surface of the machine layer 10 at the conductor connection terminal portion, and a botting resin 1 is attached to the cap 11.
2 is filled, hardened and molded to seal the conductor connection terminal portion.

FIG. 4 is a plan view of a conductive element of a low frequency treatment device incorporating a sheet heating element using the sheet heating elements shown in FIGS. 1 to 3, and FIG. FIG. 3 is a cross-sectional view taken along line B-B' of the conductive element of the low-frequency treatment device.

A sheet heating element 14, which is similar to the sheet heating element 6 shown in FIGS. 1 to 3 but whose conductor connection terminal portion is not molded, is placed on the surface of the thin metal plate 13 to form a sheet heating element. 1
In the center hole 15 of 4 □-□
A temperature sensor 16 is fitted into N-1. A portion 17 of the thin metal plate 13 is bent, and a low frequency pulse conducting wire 18 is connected to this bent portion 17. A conductive wire is connected to the temperature sensor 16.

The temperature sensor 16 and the central electrode 3 are connected via a terminal 7 and a conductor 20. Electrode 4 on the outer periphery
A conductive wire 21 is connected to the terminal 8 through a terminal 8. Thus, the planar heating element 14, temperature sensor 16, and conductive wires are covered with an intermediate cover 22.

A conducting wire conduit 23 is attached to the intermediate cover 22 so as to pass through the intermediate cover 22 .

The interior of the intermediate cover 22 is filled with a botting resin 24 and cured, and the planar heating element 14, temperature sensor 16, and conductive wires are fixed in predetermined positions. In addition, the conductor wire 18 for low frequency pulse, the conductor wires 19 and 2
1 is housed in a conductive wire consif (231c) and guided outside the conductive element of the low frequency treatment device. The outside of this intermediate cuckoo 22 is further covered with a rubber case 25. However, the back surface of the thin metal plate 13 is exposed.

Although the planar heating element of the present invention is circular or hollow circular, it has extremely high uniformity of heat generation, and is suitably used as a heating part of a temperature element and an anti-fog sharpener.

[Brief explanation of drawings]

1 and 2 are a partially cutaway plan view and a partially cutaway bottom view of an example of the sheet heating element of the present invention, respectively, and FIG.
The figure is a sectional view taken along line A A' of the planar heating element shown in FIGS. 1 and 2. Further, FIG. 4 is a plan view of a conductive element of a low frequency treatment device incorporating the sheet heating element of the present invention as a heating part, and FIG. There is a sectional view taken at B'. In the drawings: 3 Electrodes at the center 4 Electrodes at the outer periphery 10 Covering 1v611 Cap 16 Temperature sensor 17 Bend section 18 Low frequency pulse conductor 19.20 and 21'' conductor 22 Intermediate cover 23 Conduit for conductor 24 Botting holder 25 Comcous Patent Applicant
Representative of Mitsubishi Gas Chemical Corporation

Claims (1)

[Claims] Circular or circumferential electrodes are arranged at the center and outer periphery of a disc-shaped or hollow disc-shaped insulating substrate, respectively,
An electrical insulating material having water resistance and heat resistance on both row sides of the planar heating element, in which a plurality of spiral heating circuits of substantially equal width are formed at substantially constant intervals between the electrodes. A circular planar heating element is heated by the #114i conductor and the conduction from the #114i electric bulk passes through the bonded layer.