JP2552268B2 - Magnetic head - Google Patents

Description

The present invention relates to a magnetic head that slides relative to a magnetic recording medium to magnetically record or reproduce information, and more particularly to a front core, a back core and a magnetic head. The present invention relates to a magnetic head that is fitted and fixed to other components and a core holder.

[Prior Art] FIGS. 4 and 5 are an exploded perspective view and a sectional view showing a conventional structure of a full width erasing head of a video tape recorder as this type of magnetic head.

In both figures, reference numeral 1 is a front core, the cross section of which is formed in a substantially U shape, the surface indicated by reference numeral 1a is formed as a magnetic tape sliding surface, and a magnetic gap G is formed in the central portion thereof. There is.

Further, reference numeral 2 is a back core which constitutes a magnetic core together with the front core 1 and has a substantially U-shaped cross section, and a bobbin 3 around which a coil 4 is wound is fitted therein. A terminal 5 to which the terminal of the coil 4 is connected is embedded in the bobbin 3.

Reference numeral 6 is a hollow core holder that holds both cores 1 and 2, and an opening 6a for exposing the magnetic tape sliding surface 1a of the front core 1 is formed on the front side of the core holder. An opening for inserting both cores 1 and 2 on the upper side in the figure
6b is formed.

Further, reference numeral 7 is a magnetic tape sliding surface 1a of the front core 1.
Is a leaf spring for press-contacting and positioning on the front side of the core holding body 6. The leaf spring is bent at the central bending portion 7a and is formed in a dogleg shape.

In such a structure, the cores 1 and 2 are fitted in the core holder 6 downward from the opening 6b as shown in FIG. 5 with their respective rear end faces and front end faces aligned. Further, as shown in FIG. 5, the leaf spring 7 is bent so that the back surface 2a of the back core 2 is
And the inner surface 6c of the core holding body 6 on the back side. The leaf spring 7 presses the back surface 2a of the back core 2 at the bent portion 7a by the spring force to return to the original shape, and the pressing force presses the two cores 1 and 2 together so that the magnetic force of the front core 1 is reduced. The tape sliding surface 1a is pressed against the front side of the core holder 6 and positioned. The cores 1 and 2 are fixed to the core holder 6 by adhesion.

[Problems to be Solved by the Invention] The reason why both cores 1 and 2 are bonded to the core holding body 6 in the above-described structure is that the front core 1 is attached to the core holder 6 only by the pressing of the leaf spring 7 due to an impact such as vibration. This is because the core holder 6 will come out. The front core 1 is easily pulled out because the magnetic tape sliding surface 1a is in a state close to a mirror surface due to grinding and is very slippery.

However, in the structure in which both the cores 1 and 2 are bonded to the core holder 6 as described above, there is a problem in that the number of assembling steps of the magnetic head increases correspondingly and the manufacturing cost increases. In addition, there is a problem that the front core 1 may not be prevented from coming out due to good or bad adhesion.

[Means for Solving the Problems] According to the present invention for solving the above-mentioned problems, according to the present invention, in a magnetic head in which a front core and a back core are fitted and fixed to a core holder, the front core is pressed. The magnetic recording medium sliding surface of the core is pressed against the core holder, and the front core is pressed also in the fitting direction substantially orthogonal to the pressing direction so as not to come off from the core holder. The configuration provided with the configured spring member was adopted.

[Operation] According to such a configuration, the spring member presses the front core to press the sliding surface of the magnetic recording medium against the core holder, and at the same time, to prevent the front core from coming off the core holder. The front core is prevented from slipping out by pressing also in the fitting direction to the core holding body which is substantially orthogonal to the direction, so that it is not necessary to bond the front core to prevent slipping out. The number of parts does not increase, and the number of assembling steps is reduced by the fact that the front core is not required to be bonded, so that the manufacturing cost can be reduced. Also, the front core can be securely prevented from coming out.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS.

First Embodiment FIGS. 1 and 2 are an exploded perspective view and a sectional view for explaining the structure of a full width erasing head of a video tape recorder according to a first embodiment of the present invention. In both figures, the same or corresponding parts as those in FIGS. 4 and 5 of the conventional example are designated by the same reference numerals, and the description of the same parts will be omitted.

As shown in FIGS. 1 and 2, in the magnetic head of this embodiment, the structure of the leaf spring 7 is different from that of the conventional head shown in FIGS. That is, the leaf spring 7 is bent at two bent portions 7a and 7b and is formed into a substantially letter-like shape, and an arcuate curved portion 7c is formed at one end.

The other constituent members of the magnetic head of this embodiment are the same as those of the conventional example.

In such a configuration, the front core 1 and the bobbin 2
As in the case of the conventional example, the back core 2 fitted with is fitted with the rear end face and the front end face thereof into the core holding body 6 through the opening 6b downward as shown in FIG.

In addition, the leaf spring 7 is bent to bend the bent portion 7a as shown in FIG.
The side is inserted between the back surface 2a of the back core 2 and the back side inner surface 6c of the core holding body 6.

Then, the inserted leaf spring 7 presses the back surface 2a of the back core 2a toward the front side of the core holding body 6 at the bent portion 7a by the spring force to return to the original shape, and The upper end surface of the front core 1 in FIG. 2 is pressed at a portion downward in FIG. 2 substantially orthogonal to the pressing direction.

As a result, the cores 1 and 2 are pressed against each other, the magnetic tape sliding surface 1a of the front core 1 is pressed against the front side of the core holder 6, and the front core 1 is moved upward from the core holder 6 in FIG. It is prevented from slipping out and both cores 1, 2
Is fixed.

As described above, according to the present embodiment, the cores 1 and 2 are fixed by the leaf spring 7, and the front core 1 is prevented from slipping out. Therefore, the adhesion for preventing the front core 1 from slipping out is unnecessary. Compared with the conventional example, the number of parts does not increase, and the number of assembling steps is reduced by the amount of adhesion for preventing the front core 1 from coming off, so that the manufacturing cost can be reduced.

Further, according to the present embodiment, the front core 1 can be more reliably prevented from coming off by adhesion than in the case of the conventional example, and the reliability of the head can be improved.

Second Embodiment Next, FIG. 3 is a sectional view for explaining the structure of a full width erasing head of a video tape recorder according to a second embodiment of the present invention.

In the head shown in FIG. 3, the bobbin 3 is used instead of the leaf spring 7 to prevent the front core 1 from slipping out. That is, the bobbin 3 is formed of a material having an appropriate elasticity such as plastic, and has an extension 3a having a piece shape and a tip end bent downward at the upper end in the drawing. The extension 3a elastically presses the front core 1 downward in the figure to prevent the front core 1 from slipping out.

In this way, the constituent elements other than the leaf spring 5 of the magnetic head 7 can be used to prevent the front core 1 from slipping out, and the same effect as described above can be obtained.

[Effects of the Invention] As is apparent from the above description, according to the present invention, in a magnetic head in which a front core and a back core are fitted and fixed in a core holder, the front core is pressed to press the core. A spring member configured to press the sliding surface of the magnetic recording medium against the core holder and to press the front core in the fitting direction substantially orthogonal to the pressing direction so as not to come off from the core holder. Since the structure in which the front core is provided is adopted, it is possible to reliably prevent the front core from coming off and improve the reliability of the head with a structure that can reduce the number of assembling steps and reduce the manufacturing cost.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing the structure of a magnetic head according to a first embodiment of the present invention, FIG. 2 is a sectional view of the same, FIG. 3 is a sectional view of a magnetic head according to a second embodiment, and FIG. 5 and 6 are an exploded perspective view and a sectional view showing the structure of a conventional magnetic head, respectively. 1 ... Front core, 2 ... Back core 3 ... Bobbin, 3a ... Extension part 4 ... Coil, 5 ... Terminal 6 ... Core holder, 7 ... Leaf spring, 7c ... Curved part

Claims (1)

(57) [Claims] 1. A magnetic head in which a front core and a back core are fitted and fixed in a core holder, and the front core is pressed to bring a sliding surface of a magnetic recording medium of the core into pressure contact with the core holder. A magnetic head comprising a spring member configured to press the front core in the fitting direction substantially orthogonal to the pressing direction so as not to come off from the core holder.