JP2543836Y2 - Head mounting mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head mounting mechanism suitable for use in a head such as a tape recorder.

[0002]

2. Description of the Related Art A head such as a tape recorder needs to be arranged so that the head is at a correct position with respect to a magnetic tape (hereinafter referred to as "tape"). That is, it is necessary to adjust the inclination of the head gap with respect to the longitudinal direction of the tape (hereinafter, referred to as “azimuth”) perpendicularly to the tape. If this adjustment is poor, the sound will be poor in clarity with the treble removed, and the phases of the left and right channels will be shifted during stereo recording / playback.

Further, it is necessary to adjust the inclination of the head surface with respect to a direction perpendicular to the surface of the tape (hereinafter referred to as "tilt") so that the head surface is in close contact with the tape. In other words, if the adjustment is poor, the loss of recording / reproducing with respect to the tape increases, and the level difference between the left and right channels occurs during stereo recording / reproducing.

Therefore, a head mounting mechanism capable of adjusting azimuth and tilt has been proposed. FIG. 4 and FIG. 5 show an example thereof, which is applied to a head mounting portion of a tape recorder.

[0005] S is a head mounting mechanism disposed on a mechanical chassis (not shown), and has the following configuration. As shown in FIG. 5, the head plate 1 has a substantially L-shape, and a head 2 is fixed to a central upper surface in the longitudinal direction. One end of the head 2 (see FIGS. 4 and 5)
A tape guide 2a for guiding a tape (not shown) is fixed to the left end (in FIG. 2). As shown in FIG. 4, the head plate 1 is arranged on a head base 6 on a head chassis 7 with a coil spring 8 loosely fitted to the screws 3 to 5 interposed therebetween. That is, the head plate 1
It is always urged upward by the coil spring 8.
The position of the head plate 1 is regulated by the heads of the screws 3 to 5, as shown in FIG. The head base 6 is formed with a spring receiver 8 a for restricting the movement of the coil spring 8.

The head plate 1 is, as shown in FIG.
Three points are supported by three screws 3 to 5. As shown in FIG. 5, the screws 3 to 5 are arranged such that the screws 3 and the screws 4 are opposed to each other with the head 2 interposed therebetween. On the other hand, the screw 4 and the screw 5 are arranged at one end (the left end in FIGS. 4 and 5) of the head plate 1 so as to face each other along the lateral direction of the head plate 1. The azimuth adjustment and the tilt adjustment of the head 2 are performed by appropriately adjusting the three screws 3 to 5.

[0007]

As described above, in the conventional head mounting mechanism S, the tilt slightly changes when the azimuth is adjusted. Also, the azimuth changes slightly during tilt adjustment. Therefore, since the azimuth adjustment and the tilt adjustment need to be adjusted in relation to each other, it is difficult to adjust the position of the head 2.

Therefore, the present invention provides a head mounting mechanism that can easily adjust the head position.

[0009]

According to the present invention, a head base for supporting a head plate on which a head is mounted is provided. The head base is mounted and fixed to a head chassis, and the head base is mounted on the head chassis. The surface side is used as a reference surface, and a bulge of a predetermined length is arranged in a direction perpendicular to the surface of the tape with respect to the head base having the reference surface, and the head plate is supported by supporting the head plate with the bulge. This restricts the inclination of the head with respect to a direction perpendicular to the tape surface.

[0010]

The head base 6 is fixed to the head chassis 7 with the head chassis mounting surface side as a reference surface.
A bulging portion 1 having a predetermined length in a direction orthogonal to the surface of the tape is provided.
Since the head plate 1 and the head 2 cannot be rotated in a direction perpendicular to the tape surface by disposing the head plate 6 on the head base 6 and supporting the head plate 1 with the bulging portion 17, there is no need to perform tilt adjustment. This eliminates the need to perform the tilt adjustment and reduces the labor.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. In these figures, parts corresponding to those in FIGS. 4 and 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The head base 6 is attached and fixed to the head chassis 7 with the head chassis mounting surface side as a reference surface. At substantially the center in the longitudinal direction of the head base 6, a base 9 on which a vibration isolating material described later is mounted is formed. On one end side (the left side in FIGS. 1 and 3) of the head base 6, a support portion 10 slightly higher than the base 9 is formed.
On both sides of the head base 6 (left and right in FIG. 1), a pair of stands 11, 11 is provided upright. The head shield plate 12 is mounted on the stands 11 and
3, 13 attached. In the head shield plate 12, a hole 14 is formed in a portion corresponding to the screw 3 and a nut 21 described later. Further, between the head shield plate 12 and the head 2 and between the base 9 and the head plate 1, a vibration-proof material 1 such as a vibration-proof rubber is provided.
5, 16 are interposed. The vibrations of the motor and the like transmitted to the head 2 are absorbed by the vibration insulators 15 and 16.

As shown in FIG. 1, a bulging portion 17 having a substantially semicircular longitudinal section and a predetermined length is provided at one end edge (right edge in FIG. 1) of the supporting portion 10 to project upward. I have. The height of the bulging portion 17 is set so that tilt adjustment is not required. That is, the inflated portion 17 is formed with high accuracy at a uniform height over the entirety.
Rotates in parallel with the tape surface. As shown in FIG. 2, the bulging portion 17 protrudes in a direction perpendicular to the surface of the tape, that is, in a short direction of the head base 6. In addition, the bulging portion 17 is provided with the tape guide 2 a of the head 2.
Are linearly arranged at the positions corresponding to. This bulge 1
Between the head 7 and the head plate 1, a spacer 18 for adjusting the height of the head 2 is interposed.

The bulging portion 17 side (the left side in FIGS. 1 and 3)
A pair of bolts 19 and 20 for holding the bulging portion 17 side of the head plate 1 are attached to the head chassis 7 in a state where the bolts 19 and 20 are inserted through the head chassis 7 and the head base 6. That is, as shown in FIG. 3, the bolts 19 and 20 are arranged to face each other along the lateral direction of the head plate 1. One end (the lower end in FIGS. 1 and 2) of the bolts 19 and 20 is
It is swaged against the head chassis 7. Screw portions 19a, 20a protruding from head plate 1
1 and 2, a coil spring 8 is loosely fitted, and a nut 21 for applying the urging force of the coil spring 8 to the head plate 1 is screwed. Then, the bulging portion 17 of the head plate 1 is formed by the bolts 19 and 20, the coil spring 8 and the nut 21.
Holding the side. In this case, two bolts 19,
The arrangement of the head plates 20 makes it possible to stably hold the head plate 1 as compared with the case of holding the head plate 1 alone.

On the other hand, the screws 3 screwed to the head base 6 and the head chassis 7 are for adjusting the vertical position of the other end side (the right side in FIG. 1) of the head plate 1, that is, for performing azimuth adjustment. is there. This example is configured as described above, and the rest is configured similarly to the example of FIG.

According to this embodiment, in order to keep the tilt constant,
Since the bulging portion 17 that allows the head 2 to rotate only in the direction parallel to the tape surface is provided on the head base 6 having the reference surface on the head chassis mounting surface side fixed to the head chassis 7, the tilt of the head 2 becomes stable. There is no need to perform tilt adjustment. On the other hand, the azimuth adjustment is performed by adjusting the screw 3. That is, the azimuth is adjusted by pressing the head plate 1 downward with the head of the screw 3 against the upward biasing force of the spring 8 and regulating the vertical position of the other end of the head plate 1. Since the bulging portion 17 for keeping the tilt constant is provided on the head base 6 in which the reference surface on the head chassis mounting surface side is fixed to the head chassis 7, it is not necessary to perform tilt adjustment when adjusting azimuth. Can be easily adjusted. In particular, the bulging portion 17 is linearly formed with a predetermined length along the short direction of the head base 6, that is, a length that can prevent the head plate 1, that is, the head 2, from rotating in a direction perpendicular to the tape surface. Since the projections are provided, the tilt accuracy can be improved as compared with the case where the head plate 1 is supported on a flat surface and the case where the bulging portion 17 is partially arranged.

Since the bulging portion 17 is arranged at a position corresponding to the tape guide 2a of the head 2, the head 2 can be adjusted by the azimuth adjustment even if the bulging portion 1 is located immediately below the tape guide 2a.
7 rotates around the fulcrum. Therefore, since the relative position of the tape guide 2a to the tape hardly changes, the position of the tape guide 2a is stabilized. That is, the tape guide 2a can be disposed at a position where the tape is always smoothly guided.

In this embodiment, the base 9 and the supporting portion 10 are provided on the head base 6 to increase the thickness.
Deformation due to stress during processing or the like can be avoided, and in particular, processing accuracy of the bulging portion 17 can be improved. Further, since the thickness is increased in this manner, the amount of vibration transmitted from a motor (not shown) and other parts can be reduced by the head base 6 as compared with a conventional thin plate-shaped head base. That is, the conventional thin plate-shaped head base itself undulates due to vibration of a motor or the like. On the other hand, in this example, since the head base 6 is thickened, vibration is absorbed by the internal loss of the head base 6 and no undulation is caused. Therefore, since the vibration can be effectively reduced, the generation of the modulation noise due to the vibration of the head 2 can be prevented, and the good sound quality can be obtained.

In the above embodiment, the bulging portion 17 is provided at a position corresponding to the tape guide 2a of the head 2, but the position of the bulging portion 17 is not limited to this. However, if not, the position of the tape guide 2a changes with the azimuth adjustment.

[0020]

According to the invention, the head base having the head chassis mounting surface side as the reference surface is mounted and fixed to the head chassis, and the head base has a bulged portion having a predetermined length in a direction orthogonal to the surface of the tape. Are arranged and the head plate is supported by the bulging portion, so that it is not necessary to perform tilt adjustment and labor can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment.

FIG. 2 is a sectional view taken along line II of FIG. 1;

FIG. 3 is a sectional view taken along line II-II of FIG.

FIG. 4 is a front view of a conventional example.

FIG. 5 is a plan view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head plate 2 Head 2a Tape guide 3 Screw 6 Head base 7 Head chassis 8 Coil spring 17 Swelling part 19, 20 Bolt 21 Nut S Head mounting mechanism

Claims (1)

(57) [Scope of request for utility model registration] A head base for supporting a head plate on which a head is mounted, wherein the head base is mounted and fixed to a head chassis, and a head chassis mounting surface side of the head base is used as a reference surface; A swelling portion of a predetermined length is arranged in a direction orthogonal to the surface of the tape with respect to the head base having a surface, and the swelling portion supports the head plate to support the head in the direction orthogonal to the tape surface. A head mounting mechanism for regulating the inclination of the head.