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:
Dec. 10, 1991
Filed:
Dec. 29, 1989
Takuzi Yamada, Kanagawa, JP;
Seizi Tsuyuki, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A magnetic tape reel in which transformation of the tape winding surface owing to the heat shrinkage after molding is suppressed, and also transformation of the hub hole owing to the winding tension of the magnetic tape is suppressed. At least a tape winding drum portion is provided with concentric cylindrical portions including an inner cylindrical portion having a hub hole to be engaged with a rotary driving shaft, an intermediate cylindrical portion provided concentrically with and outside the inner cylindrical portion, and an outer cylindrical portion provided concentrically with and further outside the intermediate cylindrical portion so as to form a tape winding surface. The intermediate cylindrical portion and the outer cylindrical portion are connected to each other through a plurality of reinforcing ribs which extend in the radial directions of the reel but which are not present between the inner cylindrical portion and the intermediate cylindrical portion.