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:
Jul. 13, 1999
Filed:
Jun. 05, 1996
Kazuaki Inoue, Nagano-ken, JP;
Hiroyuki Yamashita, Nagano-ken, JP;
Norio Nakamura, Nagano-ken, JP;
Hiroyuki Yoda, Nagano-ken, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A semiconductor device comprising a low-heat-resistance heat discharging route suitable for small semiconductor devices, such as an IC card, is disclosed. Heat arising from electronic parts is efficiently dispersed to the outside, thereby accomplishing a decrease in size and a heightening of function. In a specific embodiment, a CPU is mounted on a substrate in a position of thermal via holes. A high-heat-conducting material such as semifluid silicone rubber is placed between a CPU mounting face of the substrate and lower panel located on the opposite side of the substrate. The high-heat-conducting material is a filler having the ability to change shape and the property of electrical nonconductivity. A greater part of the heat arising from the CPU is transmitted through the thermal via holes from the CPU mounting face of the substrate to the opposite side, and further to the high-heat-conducting material which conveys the heat to the lower panel. The heat is dispersed from the lower panel surface directly into the atmosphere.