Face-like heating device

• US 5,006,696 A
• Filed: 08/07/1989
• Issued: 04/09/1991
• Est. Priority Date: 08/26/1988
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Fujiwara, Hiroto, Uchida, Katsuyuki
• Primary Examiner(s): Envall, Jr., Roy N.
• Application Number:
  US07/390,607
• Time in Patent Office: 610 Days
• Field of Search: 219/548, 219/540, 219/543, 219/552, 219/553, 219/505
• US Class Current: 219/505
• CPC Class Codes: H05B 2203/006 using interdigitated electrodes
• CPC Class Codes: H05B 3/20 Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater H05B3/62, H05B3/68, H05B3/78, H05B3/84 take precedence
• CPC Class Codes: H05B 3/30 on or between metallic plates

Abstract

Disclosed is a face-like heating device using an organic PTC thermistor plate having at least one pair of electrodes formed on one major surface thereof and a soaking plate made of a material having a thickness in the range of 0.1 mm to 0.3 mm and having thermal conductivity of 0.4 cal cm^-1 S^-1 deg^-1 or higher adhered to the other major surface thereof.

Claims

1. A face-like heating device comprising:

a sheet-like organic positive temperature coefficient (PTC) thermistor having two major surfaces,

at least one pair of electrodes formed on one major surface of said organic PTC thermistor, and

a soaking plate adhered to the other major surface of said organic PTC thermistor,

the thickness of said soaking plate being in the range of 0.1 mm to 0.3 mm,

the soaking plate being formed of a material having a thermal conductivity of 0.4 cal cm^-1 s^-1 deg^-1 or higher.

2. The face-like heating device according to claim 1, wherein said thermal conductivity is in the range of 0.40 to 0.55 cal cm^-1 S^-1 deg^-1.

3. The face-like heating device according to claim 1, wherein said soaking plate is made of aluminium.

4. The face-like heating device according to claim 1, wherein said at least one pair of electrodes are interdiqitated comb-shaped electrodes.

5. The face-like heating device according to claim 1, wherein the area of said adhered major surface of said soaking plate is larger than the area of the major surface of the organic PTC thermistor plate which has the soaking plate adhered thereto.