Organic positive temperature coefficient thermistor

• US 4,752,762 A
• Filed: 12/27/1985
• Issued: 06/21/1988
• Est. Priority Date: 12/29/1984
• Status: Expired due to Term

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Inano, Mitsumasa, Ohshima, Toshiya
• Primary Examiner(s): Goldberg, E. A.
• Assistant Examiner(s): Lateef, Marvin M.
• Application Number:
  US06/813,706
• Time in Patent Office: 907 Days
• Field of Search: 338/22 R, 338/22 SD, 338/23, 338/224, 338/225, 338/375, 219/505, 29/612
• US Class Current: 338/22.00R
• CPC Class Codes: H01C 1/034 the housing or enclosure being formed as coating or mould without outer sheath H01C1/032 takes precedence
• CPC Class Codes: H01C 7/02 having positive temperature coefficient ceramics C04B
• CPC Class Codes: H01C 7/027 consisting of conducting or semi-conducting material dispersed in a non-conductive organic material

Abstract

A thermistor element having a positive temperature-resistance coefficient. Electrodes are connected to the positive characteristic thermistor element, around which an outer member of an armor material is formed. The armor material is composed of a synthetic resin, in which 60-80 wt. % of an insulating filler consisting of, for example, silica, alumina or the like is mixed.

Claims

1. An organic positive temperature coefficient thermistor, comprising:

an organic positive temperature coefficient thermistor element,

an electrode connected to said organic positive temperature coefficient thermistor element, and

an outer member formed around said organic positive temperature coefficient thermistor element composed of resin containing 60 wt%-80 wt% of an insulating filler.

2. An organic positive temperature coefficient thermistor in accordance with claim 1, wherein said insulating filler is selected from a group including silica, alumina, aluminum hydroxide, talc and calcium carbonate.

3. An organic positive temperature coefficient thermistor in accordance with claim 1, wherein said insulating filler is composed of an inorganic material.

4. An organic positive temperature coefficient thermistor in accordance with claim 1, wherein said resin is an expoxy resin.