MAGNETIC HEAD

• US 3,863,268 A
• Filed: 03/01/1974
• Issued: 01/28/1975
• Est. Priority Date: 08/07/1971
• Status: Expired due to Term

• Current Assignee: Yasuo Ikeda
• Original Assignee: Yasuo Ikeda
• Inventors: Ikeda, Yasuo
• Primary Examiner(s): Eddleman, Alfred H.
• Application Number:
  US05/447,788
• Time in Patent Office: 333 Days
• Field of Search: 360/121,122,126,125,123
• US Class Current: 360/121
• CPC Class Codes: G11B 5/147 with cores being composed of metal sheets, i.e. laminated cores with cores composed of isolated magnetic layers, e.g. sheets in thin films G11B5/31
• CPC Class Codes: G11B 5/193 the pole pieces being ferrite or other magnetic particles G11B5/1871 takes precedence; in thin film G11B5/31
• CPC Class Codes: G11B 5/29 Structure or manufacture of unitary devices formed of plural heads for more than one track G11B5/33, G11B5/49 and subgroups take precedence; in thin film structure G11B5/31

Abstract

A magnetic head having a magnetic core consisting of a U-shaped first core member formed with laminated magnetic alloy plates and second and third magnetic core members formed of ferrite, and a coil wound on the first magnetic core member, in which one end of each of the second and third magnetic core members of the magnetic core is joined to each end face of the first magnetic core member, the second and third magnetic core members extend inwardly to form a magnetic gap between the end faces thereof on the opposite side from the first magnetic core member and the exterior surfaces of the second and third magnetic core members on the side of the magnetic gap serve as a magnetic tape contact surface of the magnetic head. A magnetic head of the above construction in which the both end faces of the first magnetic core member and those of the second and third magnetic core members facing opposite to the former are selected so that the former (or the latter) may be included in the latter (or the former) in terms of shape and area. A multi-element magnetic head consisting of at least two magnetic head elements of the abovementioned construction and a magnetic shield plate interposed there between, in which the magnetic shield plate consists of a first magnetic plate member formed of a magnetic alloy plate and a second magnetic plate member formed of ferrite and the exterior surface of the second magnetic plate member serving as a tape contact surface.

Claims

1. A multi-element magnetic head comprising at least first and second magnetic head elements, and a magnetic shield plate interposed between the first and second magnetic head elements, in which each of the first and second magnetic head elements is made up of a magnetic core consisting of a U-shaped first magnetic core member formed with laminated magnetic alloy plates and second and third magnetic core members formed of ferrite and a coil wound on the first magnetic core member;

one end of each of the second and third magnetic core members of the magnetic core is joined to each end face of the first magnetic core member;

the second and the third magnetic core members extend inwardly to form a magnetic gap between the end faces thereof on the opposite side from the first magnetic core member;

the exterior surfaces of the second and third magnetic core members on the side of the magnetic gap serve as a magnetic tape contact surface;

the magnetic shield plate consisting of a first magnetic plate member formed of a magnetic alloy plate and a second magnetic plate member formed of ferrite and joined to the end face of the first magnetic plate member, the second magnetic plate member being thicker than the first magnetic plate member; and

the end face of the second magnetic plate member on the opposite side from the first magnetic plate member serves as a magnetic tape contact surface corresponding to those of the first and second magnetic head elements.