ES230817A1 - Method and head magnetic recorder cancel for the recording or reproduction of magnetic recordings (Machine-translation by Google Translate, not legally binding)
- Google Patents
Method and head magnetic recorder cancel for the recording or reproduction of magnetic recordings (Machine-translation by Google Translate, not legally binding)
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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Publication date
Application filed by Philips Gloeilampenfabrieken NVfiledCriticalPhilips Gloeilampenfabrieken NV
Publication of ES230817A1publicationCriticalpatent/ES230817A1/en
Annular magnetic recording head for the recording or reproduction of magnetic recordings comprising at least two circuit parts of ferromagnetic oxide material between which an effective air gap is formed which is filled with glass that acts as non-magnetic material to protect the effective air gap and that also acts to join together mechanically the two parts of circuit, characterized by the fact that as a non-magnetic material glass is used whose coefficient of expansion at the temperature at which the recording head is used, is the same in whatever possible or for example, it does not differ by more than 5% from the coefficient of expansion of the ferromagnetic material with which the said circuit parts of the head are made. (Machine-translation by Google Translate, not legally binding)
ES0230817A1955-10-041956-09-08Method and head magnetic recorder cancel for the recording or reproduction of magnetic recordings (Machine-translation by Google Translate, not legally binding)
ExpiredES230817A1
(en)
Method and head magnetic recorder cancel for the recording or reproduction of magnetic recordings (Machine-translation by Google Translate, not legally binding)
Method and head magnetic recorder cancel for the recording or reproduction of magnetic recordings (Machine-translation by Google Translate, not legally binding)