JP2000155919A - Mechanism for supporting magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supporting mechanism for exactly adjusting the angle (azimuth) of a magnetic head and for sufficiently making thin a mechanical deck. SOLUTION: A mount seat 13 for mounting a head main body 12 of a magnetic head 11, and a tape guide part 14, and an adjusting spring part 15 for applying a pressurizing force to an adjusting screw 21 are integrally formed of resin materials having required elasticity and required lubricity. In this case, the adjusting spring part 15 is formed at the head main body mounting face side of the mount seat 13, and any spring member is not interposed between the mount seat 13 and a chassis 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head support mechanism provided in a magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art A magnetic head provided in a magnetic recording / reproducing apparatus such as a tape recorder or the like is electrically or mechanically advanced to record information signals by being brought into contact with a magnetic tape driven to travel. Play the recorded signal. In the magnetic head that operates in this manner, various adjustments to the magnetic tape are performed in the magnetic head support mechanism in order to suppress the output loss in the reproduction frequency characteristic. If an error occurs in the verticality of the gap, a phase shift occurs and the output decreases, so it is necessary to adjust the angle (azimuth) loss.

Since the angle (azimuth) of the magnetic head is adjusted at a contact point at which the magnetic head is fixed to the mechanical deck, the precision of the mechanical deck is also required. Generally, the mechanical deck is incorporated in the entire magnetic recording / reproducing apparatus. This is performed while observing the reproduction output level in the final stage of production. After this adjustment, there must be no change in the attitude of the magnetic gap of the head with respect to the running of the magnetic tape. Therefore, the angle adjustment screw provided in the support mechanism is used to prevent loosening and to reduce rattling errors during fine adjustment. A spring member is mounted. Further, after the adjustment, an adhesive is often applied to prevent permanent loosening.

As a general magnetic head, as shown in FIGS. 6 and 7, a mounting base 3 made of a sheet metal and a tape guide 4 made of a sheet metal are provided on a head body 2 having a metal case of a magnetic head 1 as an exterior. Each is fixed by spot welding.
And, the attachment of this magnetic head 1 to the mechanical deck
A fixing member 6 having one end of a mounting base 3 fixed to the lower surface of the head main body 2 raised to a chassis 5 of a mechanical deck.
The mounting screw 3 is swingably inserted through the other end of the mounting pedestal 3, and a compression coil spring made of a metal material is formed on the lower surface of the mounting pedestal 3. The head body 2 is attached to the chassis 5 via the mounting base 3 by inserting an adjustment spring 9 and screwing a tip end of the adjustment screw 8 into a screw hole 10 formed in the chassis 5. Is configured to be attached to the mechanical deck.

As described above, when the magnetic head 1 is mounted on the mechanical deck, that is, when the head body 2 is mounted on the chassis 5, the fixing screw 7 on one end of the mounting base 3 is mounted.
Is for substantially completely tightening and fixing one end of the mounting base 3 to the fixing member 6 on the chassis 5 side. On the other hand, the adjusting screw 8 at the other end of the mounting base 3 is connected to the magnetic gap g of the head main body 2. The deviation of the perpendicularity of the running direction of the magnetic tape T, that is, the deviation of the head angle (azimuth) causes a phase shift of the signal, and the angle of the head main body 2 is adjusted to suppress a decrease in output. 8 to chassis 5
The tightening pressure at the other end of the mounting pedestal 3 is changed by performing the feed / return operation with respect to the screw hole 10 on the side, and the mounting pedestal 3 is tilted and variable with the one end side fixed portion as a fulcrum. Angle adjustment is performed.

The mounting pedestal 3 is inserted into the adjusting screw 8 and
Spring 9 interposed between the other end of the chassis and the chassis 5
Is for suppressing the loosening of the mounting base 3 with respect to the adjusting screw 8 at the time of fine adjustment of the angle of the head main body 2 by the tightening operation of the adjusting screw 8 and the rattling at the time of the feed / return operation of the adjusting screw 8. Reference numeral 2 denotes a configuration in which the mounting angle is changed while the mounting pedestal 3 always receives the load of the adjusting spring 9 by the adjusting screw 8 so as to be adjusted to an optimum output state.

As described above, the support mechanism of the magnetic head is constituted by the individual components of the mounting base 3, the fixing member 6, the fixing screw 7, the adjusting screw 8, and the adjusting spring 9.

[0008]

By the way, in order to meet the demand for a smaller and thinner magnetic recording / reproducing apparatus such as a tape recorder, it is naturally necessary to make the mechanical deck itself thinner. In this case, reducing the distance from the running magnetic tape to the chassis is one of the major factors for thinning. That is, as shown in FIG. 6, the only difference is to reduce the distance H between the center line a in the running direction of the magnetic tape T and the chassis 5.

However, to reduce the distance H between the center line a of the magnetic tape T and the chassis 5 in this manner also reduces the distance h between the mounting base 3 of the head main body 2 and the chassis 5 and thus adjusts the distance. The mounting length of the spring 9 is reduced.
This results in an increase in the spring constant due to a decrease in the number of turns of the adjusting spring 9, and when adjusting the head main body 2, the adjusting screw 8
When the screw is screwed in the direction of tightening, the adjusting spring 9 is brought into close contact, and depending on the design conditions of the spring, it may exceed the stress limit of the spring material and cause lack of elasticity due to so-called sag. This may cause a change in posture due to the loosening of the adjusting screw 8 after the adjustment of the angle (azimuth) of the head main body 2, causing a problem in quality.

As described above, in the magnetic head provided in the conventional magnetic recording / reproducing apparatus, the support mechanism of the magnetic head 1 includes at least the mounting base 3, the fixing member 6, the fixing screw 7, the adjusting screw 8, The component structure of the adjusting spring 9 is required, and with the thinning of the mechanical deck, conditions such as caution that the elastic force of the adjusting spring 9 decreases when the angle of the head body 2 is adjusted occur. Has led to a decline. In addition, the conditions at the time of the basic design are limited, and high accuracy is required for the control of the force of the spring alone of the adjusting spring 9, which is an element of high cost.

The present invention has been made in view of the above points, and has a simple structure, can sufficiently cope with a reduction in the thickness of a mechanical deck, and has an unstable state such as loosening of an adjusting screw due to a decrease in elastic force of an adjusting spring. An object of the present invention is to provide a support mechanism of a magnetic head from which elements are removed.

[0012]

According to the present invention, a magnetic head provided in a magnetic recording / reproducing apparatus is supported, and an angle of the magnetic head with respect to a magnetic tape is adjusted by an adjusting screw. A support mechanism for a magnetic head, wherein a mounting base for mounting a head body, a tape guide, and an adjusting spring for applying a pressing force to an adjusting screw are formed as an integral structure.

In the above configuration, it is preferable that the adjusting spring is formed on the mounting base on the side of the head body mounting surface.

In the above-mentioned configuration, it is preferable that a frame-shaped holding portion for fitting and holding the head body is formed on the mounting base portion, and a tape guide is formed on the frame-shaped holding portion.

It is preferable that the entire support mechanism is integrally formed of a resin material having required elasticity and required lubricity.

The support mechanism of the magnetic head constructed as described above has a simple structure, reduces the cost, can sufficiently cope with the thinning of the mechanical deck, and can surely prevent the adjustment screws from being loosened.

[0017]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS.

In this embodiment, a tape cassette is used as a magnetic recording medium, and a magnetic head supporting mechanism for reproducing an information signal from a magnetic tape of the tape cassette is used.

In FIG. 1 to FIG. 5, reference numeral 11 denotes a magnetic head, and has a head body 12 having a metal case as an exterior similarly to the magnetic head 1 shown in FIG. 6 and FIG. 12, a magnetic gap g is exposed. The head body 12 of the magnetic head 11
The mounting base 13, the tape guide 14 and the adjustment spring 15 are fixedly held by a resin-molded head holder 16.

That is, the head holder 16 is formed of a resin having required elasticity and lubricity, for example, a polyamide (nylon) resin, and the head body 12 is mounted on the main plate 13 a of the mounting base 13. The frame-shaped holding portion 13b to be fitted and held is formed by rising, and one side of the frame-shaped holding portion 13b is extended forward to extend the tape guide portion 14b.
The adjusting spring portion 15 is thin on one end side of the mounting base portion 13 and rises in a substantially inverted U-shape in the same direction as the frame-shaped holding portion 13b so as to be capable of laterally elastic operation. Have been. An outer side portion 15a of the adjustment spring portion 15 projects a required length from an extension surface of the main plate portion 13a of the mounting base 13,
A fixed end 13c is formed at the end of the outer side 15a in parallel with the main plate 13a, while the other end of the mounting base 13 is extended on the same plane as the main plate 13a to adjust the end. 13d is formed.

The mounting base 13 of the head holder 16
The fixed-side end 13c has a perfect circular through-hole 17a, and the adjustment-side end 13d has an elongated oval through-hole 17b extending in the direction of the adjusting spring portion 15.
On the surface opposite to the molding surface of the frame-shaped holding portion 13a, a substantially V-shaped groove-shaped fulcrum portion 13e is formed in a direction orthogonal to a line connecting the perfect circular through hole 17a and the oblong hole 17b. I have.

The thus formed head holder 16
Is the frame body holding portion 13b of the mounting base 13.
And fixedly held by bonding with an adhesive, for example, an ultraviolet curing adhesive.

On the chassis 18 side of the mechanical deck to which the head body 12 fixed and held on the head holder 16 is attached, the mounting base 13 of the head holder 16 is provided.
Screw holes 19a and 19b are respectively formed corresponding to the perfect circular through hole 17a formed at the fixed side end 13c and the oval through hole 17b formed at the adjustment side end 13d.
a of a required height and a required length with a rounded top corresponding to a substantially V-shaped groove-shaped fulcrum 13e formed on the main plate portion 13a of the mounting pedestal 13 between the a and 19b. A fulcrum 19c on the raised protrusion is formed.

The magnetic head 11 is attached to the chassis 18 of the mechanical deck formed as described above.
This attachment is performed by the fulcrum 13e on the head holder 16 side.
The fixed side end 13 on the head holder 16 side with the fulcrum 19c on the chassis 18
c is brought into contact with the surface of the chassis 18 so that the perfect circular through-hole 17a is overlapped with the one screw hole 19a on the chassis 18 side so as to correspond to the screw hole 19a. To correspond to. In this state, the adjustment-side end portion 13d is opposed from the front surface of the chassis 18 at an interval substantially equal to the height of the fulcrum portion 19c on the chassis 18 side.

Then, the fixing screw 20 is inserted into the perfect circular through hole 17a of the fixed side end portion 13c of the head holder 16 side, and the corresponding screw hole 19a is overlapped with the perfect circular through hole 17a.
Then, the fixed side end 13 c is fixed to the chassis 18 by screwing. In this state, the adjusting screw 21 longer than the fixing screw 20 is inserted into the oval through hole 17b of the adjustment side end 13d of the head holder 16 side, and the adjusting screw 21 is inserted into the screw hole 19b opposed to the oval through hole 17b at an interval. Insert it. In this way,
The head holder 16 has both ends, that is, the mounting base 1.
The magnetic head 11 is attached to the chassis 18 while being fixed to the chassis 18 at the fixed end 13c and the adjustment end 13d.

As described above, when the magnetic head 11 is mounted on the chassis 18, the magnetic gap g of the head main body 12 corresponds to the running position of the magnetic tape T. With the magnetic head 11 mounted, the adjusting screw 2
The head holder 16 is engaged with the fulcrum portion 13e of the mounting base 13 and the fulcrum portion 19c of the chassis 18 by advancing / returning the head 1 to the screw hole 17b on the chassis 18 side. The magnetic head 11 is rotated by the elastic deformation of the adjusting spring portion 15 around the portion, and the posture of the magnetic head 11 changes, that is, the angle (azimuth) is adjusted.

In the adjustment of the angle (azimuth) of the magnetic head 11, the mounting pedestal 13 of the head holder 16 is adjusted by the elastic force of the adjustment spring 15 around the fitting contact portion between the fulcrum portions 13e and 19c. The adjustment-side end 13 d side into which the screw 21 is inserted is elastically rotationally biased in a direction away from the chassis 18. Thereby, the adjustment side end 13
d is firmly in contact with the inside of the head of the adjusting screw 21, and the holder 16, that is, the entire magnetic head 11 is
The angle (azimuth) can be adjusted without rattling between the two.

According to the embodiment of the present invention configured as described above, as shown in FIG. 4, as the thickness of the mechanical deck is reduced, the distance between the surface of the chassis 18 and the center line a in the running direction of the magnetic tape T is changed. Even if the interval dimension H and the interval dimension h between the adjustment side end 13d on the head holder 16 side are limited to a small value, the adjustment spring portion 15 is not configured at the position sandwiched between the adjustment screw 21 and the chassis 18, Since the holder 16 is located on the side where the head main body 12 is mounted, the above-described interval dimensions H and h can be set arbitrarily without being affected by the adjustment spring portion 15.

Therefore, the adjustment spring portion 15 is kept at a height that does not protrude from the cassette half surface when the tape cassette is mounted on the mechanical deck, that is, the height is approximately equal to the height of the head main body 12. Irrespective of the thickness of the mechanical deck, the magnetic head 11 is always kept under the same conditions.
Angle (azimuth) can be adjusted.
The adjustment can be performed without fear of a decrease in the elastic force of the first embodiment, and with almost no need for caution during adjustment.

In this embodiment, the mounting pedestal portion 13, the tape guide portion 14, and the adjusting spring portion 15 for mounting the head body 12 are integrally formed of a resin, for example, a polyamide (nylon) resin as the head holder 16. Therefore, the number of constituent parts can be reduced while reducing the number of manufacturing steps and improving the quality, and the cost can be reduced.

In this embodiment, the head holder 16 and the fulcrum portions 13e and 19c of the chassis 18 can be configured to be opposite to each other. That is, the fulcrum 13e on the head holder 16 side is formed in the same protruding fulcrum as the aforementioned fulcrum fulcrum on the chassis 18 instead of the above-mentioned substantially V-groove fulcrum. 1
The fulcrum portion 19c on the 8-side can be formed in a substantially V-shaped groove shape similar to the above-described substantially V-shaped groove-shaped fulcrum portion on the head holder 16 side, instead of the above-mentioned raised fulcrum fulcrum portion.

The adjusting spring portion 15 on the head holder 16 side is formed of a leaf spring. In forming the head holder 16, the adjusting spring portion 15 is located at the molding portion of the adjusting spring portion 15 and insert-molded. The unit 13 and the tape guide unit 14 can be integrated.

Further, the shape of the adjustment spring portion 15 on the holder side is not limited to a substantially inverted U-shape as shown in the figure, and the adjustment side end 13 d is strongly abutted on the inside of the head of the adjustment screw 21. As described above, any spring shape that can apply an elastic biasing force to the mounting base 13 side may be used.

The embodiment of the present invention has been described above.
The present invention is not limited to this embodiment,
Various changes can be made without departing from the spirit of the present invention. For example, the entire head holder, that is, the mounting base for mounting the head body, the tape guide, and the adjusting spring may be integrally formed of a metal material. In this case, the adjusting spring is mounted on the mounting base, the tape guide. It can be formed of a spring material such as a leaf spring different from the above, and connected to the mounting base portion side.

The present invention is not limited to a tape recorder using a compact tape cassette as a recording medium, but can be applied to various magnetic recording / reproducing apparatuses such as a tape recorder using a micro tape cassette, a tape deck using an open reel tape, and the like. Things.

[0036]

As described above, the support mechanism for the magnetic head according to the present invention has a reduced number of components because the mounting base for mounting the head body, the tape guide and the adjustment spring are integrated. The cost can be reduced.

By forming the adjustment spring portion of the support mechanism on the head body mounting surface side of the mounting pedestal portion, even when the distance between the support mechanism and the chassis is reduced due to the reduction in thickness of the mechanical deck, the adjustment spring portion is provided. Can be configured to have sufficient elasticity, and the loosening of the adjusting screw can be reliably prevented, thereby improving the quality.

Further, the above-mentioned support mechanism is integrally formed of a resin material having a required elasticity and a required lubricity, so that the number of components and the number of manufacturing steps are reduced, thereby reducing the cost. Will be possible.

Since the mounting pedestal portion of the head main body and the adjustment spring portion are integrated, it is possible to eliminate the necessity of caution and confirmation at the time of angle adjustment, thereby reducing the number of adjustment steps and the conventional method. It is possible to reduce the parts management cost required for the adjusting spring.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an example of a support mechanism of a magnetic head according to the present invention.

FIG. 2 is a plan view showing a state where a head main body is attached to the support mechanism shown in FIG. 1;

FIG. 3 is a front view of the support mechanism shown in FIG. 1 in an assembled and fixed state.

4 is a front view showing a relationship between the support mechanism shown in FIG. 3 and a magnetic tape.

FIG. 5 is a front view illustrating an adjustment state of the support mechanism shown in FIG. 3;

FIG. 6 is a front view showing a relationship between a conventional magnetic head support mechanism and a magnetic tape.

FIG. 7 is a front view illustrating an adjustment state of the support mechanism shown in FIG. 6;

[Explanation of symbols]

11 magnetic head, 12 head body, 13 mounting base portion, 13a main plate portion, 13b holding portion, 13
c {fixed end, 13d {adjusted end, 13e}
Fulcrum, 14 tape guide, 15 ° adjustment screw, 1
6mm head holder, 18mm chassis, 20mm fixing screw, 21mm adjusting screw

Claims (4)

[Claims] 1. A magnetic head support mechanism for supporting a magnetic head provided in a magnetic recording / reproducing apparatus and adjusting an angle of the magnetic head with respect to a magnetic tape by an adjusting screw, wherein a mounting base for mounting a head body. And a tape guide section and an adjusting spring section for applying a pressing force to the adjusting screw. 2. The support mechanism for a magnetic head according to claim 1, wherein said adjusting spring portion is formed on a side of a head body mounting surface of said mounting pedestal portion. 3. The magnetic head support mechanism according to claim 1, wherein a frame-shaped holding portion for fitting and holding the head body is formed on the mounting base, and the tape guide is formed on the frame-shaped holding portion. A magnetic head support mechanism, characterized in that: 4. The magnetic head support mechanism according to claim 1, wherein the entire support mechanism is integrally formed of a resin material having a required elasticity and a required lubricity. Support mechanism.