JPH043307A - Rotary head device - Google Patents

Abstract

PURPOSE:To easily adjust the attaching height of a magnetic head by providing a head case, an elastic energizing member, and an adjusting screw. CONSTITUTION:The head is attached to the front end of a head base 6, and the head base 6 is attached to a head attaching face 1b of a rotating drum 1 through a supporting means. A flat spring 10 is interposed between the head attaching face 1b and the head base 6 or between the rotating drum 1 and the supporting means. An adjusting screw 12 is arranged on the rotating drum 1 and has the front end brought into contact with the head base 6, and the head base 6 is moved by the moving operation of the adjusting screw 12 to easily adjust the height of a magnetic head 5 attached to the base 6.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a rotary head device used in recording and/or reproducing devices such as video tape recorders, digital audio recorders, and the like.

B0 Summary of the Invention The present invention provides a rotating head device for use in recording and/or reproducing devices such as video tape recorders and digital audio tape recorders, in which a head base having a head chip attached to the tip end is attached to a rotating drum. The drum is supported on a surface via a support means, and the head is attached by interposing an elastic biasing member between the surface and the head base or between the rotating drum and the support means, and the tip portion is brought into contact with the head base. By placing the adjustment screw on the rotating drum,
The height position of the head chip can be adjusted by moving the adjustment screw forward or backward, and the height position of the head chip can be adjusted by an easy operation.

C6 Prior Art Conventionally, recording and/or reproducing devices, such as video tape recorders and digital audio table recorders, write and/or read high-density, high-frequency information signals onto and from magnetic tapes. In this case, a magnetic head, which is a head chip that writes and/or reads information signals to and from the magnetic tape, performs a so-called helical scan (diagonal scan) on the magnetic tape.

In such a recording and/or reproducing apparatus, a rotary head device is used to cause the magnetic head to perform a helical scan on the magnetic tape.

This rotary head device is formed in a cylindrical shape and includes a rotary drum to which the magnetic head is attached and rotated about an axis by a rotary drive device such as a motor. The magnetic head is attached so that the tip side provided with the magnetic gap protrudes from the circumferential surface of the rotating drum by a predetermined minute amount, for example, about 20 to 30 μm.

In the recording and/or reproducing apparatus using this rotary head device, when the recording and/or reproducing mode is set, the magnetic tape is wound around the rotating drum at an angle and is fed, and A rotating drum is rotated. Then, the tip of the magnetic head is brought into sliding contact with the magnetic tape in a direction oblique to the side edge of the magnetic tape, and a helical scan is performed.

Incidentally, a rotary head device used in such a recording and/or reproducing device is provided with a lead as a tape guide portion that positions the magnetic tape wound around the rotary drum at a predetermined position relative to the rotary drum. There is. This lead consists of a protrusion or a protruding pin provided on the fixed part of the rotating head device, and comes into contact with the side edge of the magnetic tape wound around the rotating drum to regulate the position of the magnetic tape. It is done like this.

The magnetic head must be mounted at a height of 1, that is, at a predetermined position in the axial direction of the rotary drum with high precision based on the lead.

If the height position of the magnetic head is not maintained with high accuracy, the magnetic head will not be able to come into sliding contact with a predetermined area on the magnetic tape, and information signals will not be written and/or read accurately. I will not be able to go to In addition, unless the height position of the magnetic tape is maintained with high accuracy, compatibility of the magnetic tape between a plurality of recording and/or reproducing devices cannot be maintained.

In other words, the information signal written on the magnetic tape by one recording and/or reproducing device cannot be read by another recording and/or reproducing device. moreover,
In a rotary head device having multiple magnetic heads,
If the height position of each magnetic head is not maintained with high precision when installing each magnetic head, the sliding locus of each magnetic head on the magnetic tape will not have the predetermined positional relationship, resulting in accurate recording and/or reproduction of information signals. can't do it.

Conventionally, in order to adjust the height position of the magnetic head on the rotating drum, as shown in FIG.
Coarse adjustment is performed by interposing a spacer 104 between the head base 102 that supports the magnetic head 101 and the rotating drum 103, and then fine adjustment screw 10
5, the head base 102 is bent to perform fine adjustment. The fine adjustment screw 105 is inserted into a screw hole 106 provided in the rotating drum 103, and by bringing the tip end into contact with the head base 102, the head base 102 can be adjusted as shown in FIG. arrow a
As shown in , the magnetic head 101 is attached by bending so that the height position changes.

D0 Problem to be Solved by the Invention As described above, there is provided a rotary head device in which the height position of the magnetic head is roughly adjusted by interposing a spacer between the rotary head and the head base. In this case, the mounting height of this magnetic head cannot be easily adjusted.

That is, the spacer 102 is connected to the rotating drum 10.
The magnetic head 101 cannot be mounted or removed unless the head base 102 is removed from the rotating drum 103 and the head base 102 is removed from the rotary drum 103. Therefore, the mounting of the magnetic head 101 requires high Coarse adjustment of the height position must be performed before the rotary head device is assembled, and if the coarse adjustment of the height position is to be performed again, the rotary head device must be disassembled.

Further, in this rotary head device, the height position of the magnetic head can be finely adjusted by bending the head base. Therefore, when the magnetic head 101 is mounted and the height position is finely adjusted, the sliding contact surface with respect to the magnetic tape is inclined with respect to the magnetic tape, and the amount of protrusion from the circumferential surface of the rotary drum 103 increases. If the inclination of the sliding surface of the magnetic head 101 with respect to the magnetic tape changes, or the amount of change in the amount of protrusion of the magnetic head 101 from the circumferential surface of the rotating drum 103 increases, the information on the magnetic tape changes. There are some ways in which signals cannot be written and/or read accurately.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and it is possible to easily adjust the height position of the head chip when mounting the head chip. It is an object of the present invention to provide a rotating head device that can prevent changes in the inclination with respect to a magnetic tape and the amount of protrusion of this head chip from the circumferential surface of a rotating drum.

Means for Solving the E0 Problems In order to solve the above-mentioned problems and achieve the above-mentioned objects, the rotating head device according to the present invention has a head chip attached to the tip side, and the head of the rotating drum is attached to the surface via support means. a head base supported by the head; an elastic biasing member interposed between the head mounting surface and the head base; or an elastic biasing member disposed on the rotary drum; An adjustment screw is provided for bringing the tip end into contact with the head base, and the mounting height of the head chip is adjusted by moving the adjustment screw forward and backward.

F1 Effect In the rotary head device according to the present invention, the head base has a head chip attached to the tip side and the head of the rotary drum is supported by a support means on the surface, and the head base is supported by the surface and the head base. or an elastic biasing member interposed between the rotating drum and the supporting means, and an adjustment screw disposed on the rotating drum that brings the tip end into contact with the head base. , is moved by moving this adjustment screw forward or backward.

By moving this head base, the mounting height of the head chip is adjusted.

G. Examples Specific examples of the present invention will be described below with reference to the drawings.

In the rotary head device according to the present invention, a magnetic tape to be fed is wound around the magnetic tape, and a magnetic head, which is a head chip, performs a so-called helical scan on the magnetic tape, thereby transmitting information signals to the magnetic tape. It is a device for writing and/or reading.

This rotary head device includes a rotary drum 1, as shown in FIGS. 1 and 2. The rotary drum 1 is disposed coaxially with the fixed drum 3, which is fixedly disposed on the chassis 2 of the recording and/or reproducing apparatus in which the rotary head device is used. It is rotatably supported by the fixed drum 3 via a support shaft 4 .

The rotating drum 1 and the fixed drum 3 are made of a metal material such as aluminum and are formed into a cylindrical shape. The rotating drum 1 and the fixed drum 3 have substantially the same outer diameter. Further, the rotating drum 1 is
The spindle 4 is rotated by a rotational drive device such as a motor (not shown).
It is designed to be rotated around this support shaft 4 as shown by arrow R in FIG. The fixed drum 3 is provided with a lead (not shown) that regulates the position of the magnetic tape wound around the rotating drum 1 and the fixed drum 3.

As shown in FIGS. 1 and 2, the rotary drum 1 is provided with a plate-shaped head base 6 on which a magnetic head 5, which is a head chip, is attached. To this place・
The Radbase 6 is connected to the fixed drum 3 of the rotating drum 1.
The head mounting provided on the opposite side is supported against surface 1b.

The head base 6 is supported so that the magnetic head 5 faces outward through a magnetic head protrusion hole 1a provided on the circumferential surface of the rotary drum 1.

The magnetic head 5 has a distal end side provided with a magnetic gap located outwardly from the circumferential surface of the rotating drum 1, for example 20 to
It is supported so as to protrude by a predetermined minute amount of about 30 μm.

Incidentally, the head base 6 is attached to the rotary drum 1 so as to be movable in the direction of the rotation axis of the rotary drum 1, which is indicated by arrow A in FIG.

That is, this head base 6 has a pair of through holes 6a, 6.
a are provided, and these through holes 6a.

A pair of mounting screws 77 serving as supporting means are inserted through the fixing drum 6a from the fixed drum 3 side. For these attachment screws 7.7, the screw heads 7a, 7a are made larger in diameter than the respective through holes 6a, 6a, and the head head 6 is supported by these screw heads 7a, 7a. These mounting screws 77 are further inserted through a pair of insertion holes 8, 8 provided in the rotary drum 1, and have their tips protruded toward the upper surface of the rotary drum 1. For these attachments, a pair of nuts 9, 9 serving as supporting means together with the screws 7.7 are screwed into the ends of the screws 7.7 that protrude from the rotating drum 1. There is. Therefore, the head base 6 has the above-mentioned nuts 9.9.
By rotating each of the above-mentioned attachments with respect to the screw 7.7, these attachments can be adjusted to move in the axial direction of the rotary drum 1 together with the screw 7.7.

A spring 10 serving as an elastic biasing member is interposed between the head base 6 and the rotating drum 1 so as to be sandwiched between the head base 6 and the rotating drum 1. There is. This leaf spring 10 is bent in a wave shape and elastically presses and supports the head base 6. When the head base 6 is moved relative to the rotary drum 1 in the axial direction of the rotary drum, the leaf spring 10 is elastically displaced to follow the head base 6. Further, this plate blade 10 is connected to the rotating drum 1.
It has appropriate rigidity in the direction perpendicular to the axis of the rotary drum 1, and prevents the head base 6 from moving in the direction perpendicular to the axis of the rotary drum 1.

As shown in FIG. 3, a screw hole 11 is provided at a position between the insertion holes 8.8 of the rotary drum l, penetrating from the upper surface side to the lower surface side of the rotary drum 1. There is.

This screw hole 11 has a fine adjustment screw 12 that serves as an adjustment screw.
is screwed in.

This fine adjustment screw 12 is a screw without a screw head,
By being rotated, it is possible to move within the screw hole 11 from the upper surface side to the lower surface side of the rotary drum 1. Further, the fine adjustment screw 12 is mounted at a pitch smaller than that of the screw 7.7. This fine adjustment screw 12 has one end protruding from the screw hole 11 toward the fixed drum 3 side, and has one end in contact with the head 6. Note that the leaf spring 10 , this plate spring lO is the fine adjustment screw 12
A cutout portion 10a is provided to prevent contact with the holder.

In the rotary head device according to the present invention configured as described above, the rotation axis of the rotary drum 1 of the magnetic head 5 is set on the basis of the fixed drum 3, that is, on the basis of the shaft provided on the fixed drum 3. To adjust the axial position, that is, the height position of the magnetic head 5, first move the head base 6 by rotating the pair of nuts 9.9, and perform coarse adjustment. conduct. At this time, even if the head base 6 is moved in the axial direction of the rotary drum 1, it does not tilt due to this movement. In addition, even if the head base 6 is moved in the narrow direction of the rotary drum 1, the magnetic hend 5 does not change the amount of protrusion from the circumferential surface of the rotary drum 1 on the distal end side.

Next, in order to finely adjust the height of the mounting, the fine adjustment screw 12 is rotated to change the pressing force against the head base 6. Then, the head base 6 becomes
The magnetic head 5 is slightly bent to move the magnetic head 5 in the axial direction of the rotary drum 1.

At this time, the head base 6 is attached to the fine adjustment screw 1.
2, each of the attachments is pressed against the intermediate portion of the portion supported by the screws 7.7, so even if it is bent, the magnetic head 5 does not tilt with respect to the magnetic tape. Furthermore, even when the head base 6 is bent by the fine adjustment screw 12, the amount of protrusion of the tip of the magnetic head 5 from the circumferential surface of the rotary drum 1 is not changed.

In addition, when a plurality of magnetic heads are attached to the rotating drum 1, each magnetic head is attached at the same height position by fine adjustment of the height position, so-called bearing. Adjustments can be made.

In the rotary head device according to the present invention, the magnetic tape to be fed is wound around each of the drums 3 at an angle, and the magnetic head 5 is rotated by rotating the rotary drum 1. The magnetic tape is brought into sliding contact with the side edge of the magnetic tape in an inclined direction, thereby performing a so-called helical scan. And this magnetic head 5
Accordingly, information signals are written to and/or read from the magnetic tape.

Note that the rotating head device according to the present invention is not limited to the configuration in which the plate spring 1O serving as an elastic biasing member is interposed between the head base 6 and the rotating drum 1 as in the above-described embodiment. .

That is, in this rotary head device, in supporting the head base 6 with respect to the rotary drum l, a pair of screw holes 6b, 6b are provided in the head base 6, as shown in FIG. For installation, the screws 7.7 are inserted from the upper surface side of the rotary drum l into the respective insertion holes 8.8, and the tips of the screws 7.7 are made to protrude toward the fixed drum 3 side, and the screws 7. Each set screw 7.7
The distal end side may be screwed into the pair of screw holes 6b, 6b. In this case, a pair of wave-shaped plate springs 13.13 serving as elastic biasing members are attached to the rotating drum 1 and the screw heads 7a of the screws 7.7.
, 7a. The fine adjustment screw 12 serving as an adjustment screw is inserted into each of the insertion holes 8, 8.
The head base 6 is screwed into the screw hole 12 provided at a position between the screw holes 6b, and presses a position between the screw holes 6b of the head base 6.

In the rotary head device configured as described above, the height position of the magnetic head 5 attached to the head base 6 can be adjusted by coarse adjustment or fine adjustment by rotating the fine adjustment screw 12. You can do both.

Also in this rotary head device, when the height of the magnetic head '5 is adjusted, the inclination of the magnetic head 5 with respect to the magnetic tape and the angle of the magnetic head 5 from the circumferential surface of the rotary drum 1 are determined. No change in protrusion amount occurs.

H0 Effects of the Invention As described above, in the rotary head device according to the present invention, the head chip is attached to the tip side, and the head attachment of the rotary drum is supported on the surface via the support means.・7D installation is between the surface and the above head base,
Alternatively, the positioning is performed by an elastic biasing member interposed between the rotating drum and the supporting means, and an adjustment screw disposed on the rotating drum and bringing the tip end into contact with the head base. Further, the head base is moved by advancing and retracting the adjusting screw. By moving the head base in this manner, the mounting height of the head chip can be adjusted.

That is, the present invention can provide a rotary head device in which the height position of the head chip can be easily adjusted. Further, the present invention provides a rotation system in which the head chip is mounted so that the inclination of the head chip with respect to the magnetic tape and the amount of protrusion of the head chip from the circumferential surface of the rotating drum do not change by adjusting the height position. A head device can be provided.

[Brief explanation of drawings]

FIG. 1 is a side view showing the configuration of the rotary head device according to the present invention, FIG. 2 is an exploded perspective view showing the configuration of the main parts of the rotary head device, and FIG. 3 is a side view showing the configuration of the rotary head device according to the present invention. FIG. 3 is a plan view showing the configuration of main parts. FIG. 4 is an enlarged front view of the main parts showing another example of the structure of the main parts of the rotary head device. FIG. 5 is a side view showing the configuration of a conventional rotary head device.

Claims (1)

[Scope of Claims] A head base having a head chip attached to the tip side and supported by a head mounting surface of a rotating drum via a support means; an elastic biasing member interposed between the drum and the support means; and an adjustment screw disposed on the rotary drum for bringing a tip end into contact with the head base; A rotating head device that adjusts the mounting height position of the head chip.