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. 19, 1996
Filed:
Nov. 01, 1995
Kaoru Kawasaki, Saku, JP;
Akira Saitoh, Saku, JP;
Akihiko Seki, Saku, JP;
Kazuyuki Shimazaki, Saku, JP;
Takahiro Mori, Hino, JP;
Hisato Kato, Hino, JP;
TDK Corporation, Tokyo, JP;
Konica Corporation, Tokyo, JP;
Abstract
This invention concerns a method for producing a magnetic recording medium by passing a magnetic coating material comprising a ferromagnetic powder and a binder resin through an ultrasonic treating device under the operating conditions of 10 to 200 kHz of frequency of oscillation and 10 to 100 .mu.m of amplitude of ultrasonic wave thereby effecting ultrasonic treatment of the magnetic coating material and coating the treated magnetic coating material on a substrate either directly or through an undercoating layer, characterized in that the ultrasonic treating device comprises an ultrasonic treating tank adapted to effect ultrasonic wave treatment of the magnetic coating material by passing the material therethrough, an ultrasonic wave horn inserted into the ultrasonic treating tank and provided with an operating end surface capable of exerting an ultrasonic oscillation on the magnetic coating material, and an ultrasonic wave oscillator connected to a basal part side of the ultrasonic wave horn, an operating depth H defined by the distance from the operating end surface of the ultrasonic wave horn to a bottom wall surface of the ultrasonic treating tank opposed to the operating end surface is set at a magnitude in the range of 2 to 40 mm, and the magnetic coating material to be coated on the substrate is subjected to tile ultrasonic treatment.