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:
Feb. 25, 1997
Filed:
Dec. 13, 1994
Yasuo Mizuno, Katano, JP;
Yoshihiro Hori, Hirakata, JP;
Masaki Ikeda, Hirakata, JP;
Akihiko Yoshida, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A magnetic head of the present invention includes a pair of substrates which are formed of ferrite and sealed with sealing glass, wherein an averaged thermal expansion ratio of the sealing glass in the range of 30.degree. C. to a setting temperature .alpha..sub.Ts (glass) is smaller than an averaged thermal expansion ratio of the substrate in the range of 30.degree. C. to a setting temperature .alpha..sub.Ts (substrate); and a difference between a thermal expansion ratio at a glass transition temperature of the sealing glass and a thermal expansion ratio at a yielding temperature thereof is 2.times.10.sup.-3 or less.