The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 1992
Filed:
Feb. 28, 1991
Mikko Pesola, Salo, FI;
Nokia Mobile Phones, Ltd., Salo, FI;
Abstract
The invention relates to a cooling construction for cooling a power transistor (4) having a plastic encapsulation, wherein the waste heat produced is conducted away mainly via the collector lead (6), the collector lead being connected to the collector strip (3) on the circuit board. When it is desired to conduct the produced waste heat specifically on the component side of the circuit board (1), it is possible to use a construction according to the invention in which there is placed on the circuit board (1) a highly heat conductive insulation plate (8) which covers the collector strip (3) entirely over part of its length next to the transistor (4), and that to the insulation plate (8) there is fixed a cooling plate (9) to which the thermal energy produced in the transistor is conducted. The insulation plate (8) may in part also extend on top of the plastic encapsulation of the transistor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile