Film magnetic head and its individual identification method

Abstract

The objective is to provide a thin film magnetic head capable enhancing reading accuracy by avoiding the erroneous detection of identification information and capable of improving the reliability of a head, and its individual indentifying method.In a thin film magnetic head indentified based on a lot number of a plurality of digits given to the particular position of a slider, a check code for error correction which is given to each lot number by a prescribed rule is formed near the lot number. The lot number of the plurality of digits consists of characters or numerals in a plurality of character / numeral groups which are set in association with numeral numbers showing the head indentification information and the check code is selected and set from among a character / numeral group which is usable for this lot number according to the check rule.

Description

technical field [0001] The present invention relates to a thin film magnetic head which is used in a magnetic disk device and the like and has an individual identification mechanism and an individual identification method thereof. Background technique [0002] As is well known, a magnetic head device includes a supporting member made of a leaf spring material or a flexible circuit board, and a magnetic head body mounted on the front end of the supporting member. The main body of the magnetic head is made of alumina·titanium carbide (Al 2 o 3 · A slider made of a ceramic material such as TiC, in which a thin-film element (magnetic head element) is formed on the end surface on the dragging side. The thin-film element has an MR head (read head) that detects a leakage field from a recording medium using the magnetoresistive effect and reads a magnetic signal, and an inductive head (write head) that forms a pattern with a coil or the like. The magnetic head main body is comple...

AI Technical Summary

Problems solved by technology

[0008] However, since the individual identification information is given to the slider during or after the thin film process, there is a possibility that dirt may adhere to the identification information part during the manufacturing process or assembly process.

Identification information is generally read by image processing, but if the identification information part and its surroundings become dirty, the reading accuracy will decrease, resulting in false detection or reading error

If false detection and reading errors of identification information occur, the process information, product type information, batch information, etc. of the magnetic head cannot be grasped, and the reliability of the magnetic head will deteriorate.

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