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:
May. 24, 1977
Filed:
Jul. 10, 1975
Alfred M Nelson, Redondo Beach, CA (US);
Cubic Photo Products Division, Los Angeles, CA (US);
Abstract
A head for producing magnetic images of fine detail, including a group of recording elements spaced perpendicular to the movement of a magnetic tape and a power source that passes current pulses through the recording elements to create magnetic fields that magnetize small regions of the tape. Each recording element includes an elongated conductor with a thin nickel layer nearest the magnetic tape and a thick copper layer on the side of the nickel layer opposite the tape, the copper layer having a small gap therein at a predetermined recording location. Accordingly, the center of current flow is normally through a middle portion of the copper which is too far from the magnetic tape for the resulting magnetic field to magnetize the tape, except at the recording location where the current passes through the nickel layer which is close enough to the tape to magnetize it.