JPS6216212A - Magnetic head - Google Patents

Abstract

PURPOSE:To decrease the induction noise from the outside and to improve S/N by providing a reproduction circuit and patterns not connected to head windings onto a flexible substrate for a magnetic head. CONSTITUTION:The magnetic head for a flexible disk device consists of a head body 11 provided on a gimbal 10, a read-write winding 8 and erase winding 9 wound thereon and the flexible substrate 1 for connecting the windings to the reproduction circuit. A grounding pattern 3, signal pattern 4, erase pattern 7, head select pattern 6 and waste pattern 5 are provided for the purpose of electrical connection on the substrate 1. The signal pattern 4 is protected against noise by the ground pattern 3 and the waste pattern 5 according to such constitution. The S/N is thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a magnetic head for a magnetic recording device used for magnetic recording of information.

<Summary of the Invention> The present invention solves the problem of inducing noise by adding a pattern that is not connected to the reproduction circuit and the head winding to a flexible substrate that connects the magnetic head and the reproduction circuit in a magnetic head used in a magnetic recording device. <Prior art> A conventional magnetic head has a structure as shown in Fig. FIG. 2 shows a magnetic head used in a 7-flexible disk device. The magnetic head and the reproducing circuit are connected by a flexible substrate 12. Flexible boards are often used because they have the advantage that the head C) can be easily moved from one track to another by using a flexible board for connection. This flexible substrate has a signal pattern 16. i ground pattern 15, head select pattern 17. However, in the conventional flexible substrate having the erase pattern 18, the noise (for example, C
There was a large amount of noise (from RTs, switching power supplies, and motors used in recording devices), which sometimes caused errors when reproducing information.

Therefore, in order to solve these conventional problems, it is an object of the present invention to reduce the amount of induced noise.

<Means for Solving the Problems> In order to solve the above problems, the magnetic head of the present invention has the following features: (1) In a magnetic head for magnetic recording that uses a flexible substrate for connection to a reproduction circuit, the flexible substrate is Having an independent pattern that is not connected to either the reproduction circuit or the head winding is considered to be copying.

(2) The wiring pattern of the flexible board is arranged in the following order: (ground pattern) - (signal pattern) - (pattern not connected to the reproduction circuit or head winding).

<Function> The present invention is capable of reducing externally induced noise by forming an independent pattern (hereinafter referred to as a discarded pattern) on a flexible substrate that is not connected to either the reproduction circuit or the head winding. A magnetic recording device with a good N ratio can be realized.

<Example> An example will be described below with reference to the drawings. FIG. 1 shows an example in which the present invention is applied to a magnetic head for a flexible disk device. A magnetic head for a flexible disk device includes a head body 11. mounted on a gimbal 10. It consists of a read/write winding 8 and an erase winding 9 wound around this, and a flexible base fi[1 that connects the winding to a reproducing circuit. A ground pattern 3, a signal pattern, a 4% erase pattern 7, a head select pattern 6, and a discard pattern 5 are provided on the flexible substrate 1 171t for electrical connection.

With this configuration, the signal pattern 4 is protected from noise by the ground pattern 3 and the sacrificial pattern 5. Compared to the conventional example, there is only one additional pattern, and there is almost no increase in cost. Figure 3 (A) is a conceptual diagram of the electric field when there is no discarded pattern, and Figure 3 (F) is a conceptual diagram of the electric field when there is a discarded pattern. A conceptual diagram of an electric field is shown. According to the flexible substrate configured as described above, the electric field component 13 of the noise is absorbed by the ground pattern 3. If there is no discarded pattern as shown in FIG. 3(A), part of the electric field is used for signals. It invades pattern 4, but if there is a discarded pattern 5 as shown in Fig. 3 (F), the discarded pattern y5Fi is not connected anywhere, so no charge movement occurs and the electric field enters this pattern. As a result, a region 14 is created near the discarded pattern 5 into which electromagnetic fields are difficult to penetrate, making it difficult to induce noise into the signal pattern 4 adjacent to the discarded pattern 5. Mistakes will no longer occur. This effect may be achieved even if the pattern is not configured as shown in FIG. 5(R) or even if the number of discarded patterns 5 is small as shown in FIG. 1.

<Effects of the Invention> As described above, according to the present invention, by providing a pattern that is not connected to the reproducing circuit and the head winding on the flexible substrate of the magnetic head, an area where electromagnetic fields do not enter around the pattern can be created. If a signal pattern is provided in this area, it is possible to reduce the noise that enters the flexible substrate, thereby preventing errors from occurring in the magnetic recording device.

In particular, near 11C and R7, the effect of the present invention is significant because long flexible circuit boards are increasingly used and the amount of induced noise is increasing.

[Brief explanation of drawings]

FIG. 1 is a plan view of the magnetic head. FIG. 2 is a plan view of a conventional magnetic head. FIG. 5 is an explanatory diagram of the principle, and FIG. 3(a) shows a schematic diagram of an electric field without a discarded pattern, and FIG. 3(b) shows a schematic diagram of an electric field with a discarded pattern. 1... 7 lexiple board of the present invention 2... Part of the connector to the reproduction circuit 3... Grounding pattern 4... Signal pattern 5... Disposable pattern 6... Head selection pattern 7...・Erase putter. 8... Read/write winding 9... Erase winding 10... Gimbal 11... Head body 12... Conventional flexible pattern 13... Electric field 14... Area where electromagnetic fields are difficult to penetrate 15...Grounding pattern 16...Signal pattern 17...Head select pattern 18...Erase pattern To Hokan, Triplane January 1st! A 2nd fn1

Claims (2)

[Claims] (1) A magnetic head for magnetic recording using a flexible substrate for connection to a reproduction circuit, characterized in that the flexible substrate has an independent pattern that is not connected to either the reproduction circuit or the head winding. (2) The wiring pattern of the flexible board is arranged in the following order: (ground pattern) - (signal pattern) - (pattern that does not connect the head winding to the reproduction circuit) The magnetic head according to item 1.