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:
Sep. 26, 1978
Filed:
Oct. 27, 1977
Tadao Shioyama, Katano, JP;
Minoru Koda, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A guide drum apparatus includes: a stator plate having armature windings fixedly mounted on a surface thereof perpendicular to the axis of a center shaft. Rotary magnets are fixedly supported by the center shaft on a plane perpendicular to the axis of the center shaft and face the armature windings so that the magnetic fluxes from the armature windings cause the rotary magnets to rotate according to the operational principle of a brushless d.c. motor. A stationary hollow cylindrical drum coaxially and rotatably mounts the center shaft. A rotary hollow cylindrical drum coaxially and fixedly mounted on the center shaft and has a rotary head fixedly mounted at an outer peripheral surface thereof. The outer surfaces of the stationary and the rotary drums are arranged on the same cylindrical surface to form a magnetic tape guiding surface, and the hollows of the stationary and the rotary drums form a contiguous bore containing all of the rotary magnets, the armature windings and a rotary transformer therein. This guide drum apparatus can be made compact in size and yet can smoothly rotate the rotary head without disturbing the signals on the magnetic tape.