JP2508628Y2 - Rotating head device - Google Patents

Description

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

B. Outline of the Invention The present invention relates to a rotary drum that includes a protrusion that is provided in a cylindrical shape on the peripheral edge side of the head mounting surface side, and a notch formed by notching a part of the protrusion. A fixed drum whose upper end surface on the peripheral edge side has a flat shape, a head base mounted with one side surface facing the head mounting surface of the rotating drum, and one side surface facing the head base A head chip that is attached to the side surface and a part of which faces the outside of the cutout portion, and a relay conductor pattern that is attached to the other side surface of the head base and that is connected by a lead wire from the head chip. The protrusion is formed so that the head chip and the head base do not protrude to the fixed drum side, which facilitates manufacturing and also fixes the fixed drum to the head mounting surface side of the rotary drum. The by reducing the interference between the stationary drum and these rotary drum in the case of providing, in which form enables the thickness of the apparatus.

C. Conventional technology Conventionally, high density, compared to magnetic tape such as video tape recorders and digital audio tape recorders,
In a recording and / or reproducing apparatus for writing and / or reading a high frequency information signal, the magnetic head, which is a head chip for writing and / or reading an information signal on the magnetic tape, is A so-called helical scan (oblique scanning) is performed 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.

As shown in FIG. 4, this rotary head device has a rotary drum 101 formed in a cylindrical shape.
The rotary drum 101 has a support shaft 102 along the central axis.
And a bearing 114 mounted around the spindle 102.
It is rotatably supported by the fixed drum 104 via. The fixed drum 104 is formed in a cylindrical shape having substantially the same outer diameter as the rotating drum 101, and is fixedly arranged on the chassis 103. These rotating drum 101 and fixed drum 1
04 is coaxial with each other.

The rotary drum 101 is rotatably operated around the axis by a rotary drive device such as a motor (not shown) via the support shaft 102.

The magnetic head 106 is attached to the tip side of one side surface side of the head base 105, and the base end side of the one side surface side of the head base 105 is attached to the surface of the rotary drum 101 on the side facing the fixed drum 104. As a result, it is attached to the rotary drum 101. And this magnetic head 106
The front end portion 106a provided with the magnetic gap is projected from the peripheral surface of the rotary drum 101 by a predetermined minute amount of, for example, about 20 to 30 μm. Since the magnetic head 106 is attached to one side surface of the head base 105, a head escape recess 107 is provided in a portion of the rotary drum 101 corresponding to the magnetic head 106.

Further, the head base is provided on the peripheral portion of the upper surface side of the fixed drum 104 facing the rotary drum 101.
A head base escape recess 115 is provided over the entire circumference so as not to contact the 104.

Then, the lead wire 109 pulled out from the magnetic head 106 is inserted through the lead wire through hole 110 provided in the head base 105, and the relay substrate 108 attached to the other side surface side of the head base 105. It is connected to the conductor pattern. The relay board of the relay board 108 is the relay lead wire 111.
Through the rotary side coil 112a of the rotary transformer 112
It is connected to the.

The rotary transformer 112 includes a rotary side coil 112a attached to the rotary drum 101 via a coil support cylinder 113 attached to the fixed drum 104 side of the rotary drum 101, and the rotary drum 112 inside the fixed drum 104. The fixed side coil 11 is housed and closely opposed to the rotating side coil 112a.
It consists of 2b.

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 rotary drum 101 and the fixed drum 104 while being inclined, and is fed, and the rotary drum 101 is also rotated. Then
The tip portion 106a of the magnetic head 106 is brought into sliding contact with the magnetic tape in a direction inclined with respect to the side edge of the magnetic tape, and a helical scan is performed.

Information signals are exchanged between the magnetic head 106 and a signal processing unit of a recording and / or reproducing apparatus (not shown) configured by using the rotary head device via the rotary transformer 112. Recording and / or reproduction of information signals on the magnetic tape is performed.

D. Problem to be Solved by the Invention In the rotary head device configured as described above, the magnetic head 106 is attached to one side surface of the head base 105, and the lead wire 109 from the magnetic head 106 is attached. The relay substrate 108 to which the
Since the head base 105 is attached to the other side surface side, the lead wire through hole 110 for inserting the lead wire 109 is provided in the head base 105 as described above. Providing the lead wire through hole 110 in the head base 105 as described above complicates the production of the head base 105.

Further, in this rotary head device, the lead wire
When connecting 109 to the relay board 108, it is necessary to insert the lead wire 109 into the lead wire through hole 110, so that the work of connecting the lead wire 109 is complicated.

By the way, the peripheral edge of the rotary drum 110 and the peripheral edge of the fixed drum 104 need to be arranged close to each other so as to form a gap equal to or smaller than a predetermined interval. That is, when the distance between the peripheral portions of the drums 101 and 104 becomes wide, the so-called air gap that should be formed between the drums 101 and 104 and the magnetic tape by the rotation of the rotary drum 101 is not well formed, This is because there is a possibility that an accident such as sticking of the magnetic tape to the heads 101 and 104 or winding of the magnetic tape between the drums 101 and 104 may occur. Further, in this rotary head device, it is necessary to provide the fixed base 104 with the head base escape recess 115 in order to prevent interference with the head base 105. Therefore, in this rotary head device, it is necessary to form the peripheral portion of the fixed drum 104 with a small thickness, which makes it difficult to manufacture the fixed drum 104, and the fixed drum 104 is also difficult to manufacture.
It is not possible to improve the durability of the.

Further, in this rotary head device, the head base is placed on the fixed drum 104 side from the rotary drum 101.
Since 105 is in a protruding state, it is difficult to make the device thinner.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and the assembly and manufacturing are facilitated, the durability is good, and the rotation of the device can be reduced. An object is to provide a head device.

E. Means for Solving the Problems In order to solve the above problems and achieve the above objects, a rotary head device according to the present invention is provided with a projecting portion that is provided in a cylindrical shape on the peripheral side of the head mounting surface side, A rotary drum having a notch formed by forming a notch in a part of the protrusion;
A fixed drum whose upper end surface on the peripheral edge side has a flat shape, a head base mounted with one side surface facing the head mounting surface of the rotating drum, and another side surface facing one side surface side of the head base. Head chip that is mounted on the side of the head base and that is partly exposed to the outside of the notch, and a relay conductor pattern that is mounted on the other side surface of the head base and that is connected by a lead wire from the head chip. The protrusion is formed so that the head chip and the head base do not protrude toward the fixed drum.

F. Action In the rotary head device according to the present invention, the head chip is mounted on the other side surface of the head base, which is mounted with one side surface facing the head mounting surface of the rotary drum, and is pulled out from the head chip. Since the relay conductor pattern to which the conductor wire is connected is provided on the other side surface side of the head base, the connection of the lead conductor wire to the relay conductor pattern is facilitated. Further, since the protruding portion is formed so that the head chip and the head base do not protrude toward the fixed drum side, the head base does not protrude from the rotary drum.

G. Embodiment Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings.

In the rotary head device according to the present invention, a magnetic tape to be fed is wound, and a magnetic head serving as a head chip is used to perform so-called helical scanning on the magnetic tape, so that an information signal is transmitted to the magnetic tape. A device for writing and / or reading.

As shown in FIGS. 1 and 2, this rotary head device has a rotary drum 1. This rotating drum 1
On the fixed drum 4 fixedly arranged on the chassis 3 of the recording and / or reproducing apparatus in which this rotary head device is used, it is arranged coaxially with the fixed drum 4 and is supported with respect to the fixed drum 4. It is rotatably supported via a shaft 2. The rotary drum 1 and the fixed drum 4 are formed in a columnar shape from a metal material such as aluminum. The rotary drum 1 and the fixed drum 4 have substantially the same outer diameter. The support shaft 2 is
The fixed drum 4 is supported by bearings 14.

The rotary drum 1 is rotated by a rotary driving device such as a motor (not shown) via the support shaft 2 and the support shaft 2
It is designed to be rotated around.

A head mounting surface is formed on the lower surface side of the rotary drum 1 which faces the fixed drum 4. The head mounting surface is provided in the vicinity of the peripheral edge of the rotary drum 1, and the plate-shaped head base 5 is mounted on the head mounting surface. The head base 5 is attached to the drum 1 by a pair of setscrews 15 and 15 so that one side surface of the head base 5 faces the lower surface of the rotary drum 1 and is brought into contact with the lower surface.

A pair of magnetic heads 6, 6 are attached to a substantially central portion of the head base 5 on the other side surface facing the one side surface side. These magnetic heads 6, 6 have tip portions 6a,
A magnetic gap is formed at 6a. These magnetic heads
The tips 6a and 6a of the rotary drum 1 are protruded outward from the peripheral surface of the rotary drum 1 by a predetermined minute amount of, for example, 20 to 30 μm.

A skirt portion 7 which is a cylindrical protrusion is integrally provided on the peripheral edge of the lower surface of the rotary drum 1 toward the fixed drum 4. This skirt part 7
Is formed as an annular ridge, and the outer surface thereof is flush with the outer peripheral surface of the rotary drum 1. The skirt portion 7 has a portion corresponding to the magnetic heads 6, 6 cut out to form a magnetic head window portion 8 which constitutes a cutout portion.

The lower end of the skirt portion 7 and the upper end of the fixed drum 4 on the peripheral edge side are arranged in close proximity to each other so as to form a gap equal to or smaller than a predetermined gap. That is, when a magnetic tape is wound around each of the drums 1 and 4 and the rotary drum is rotated, a so-called air gap is formed between each of the drums 1 and 4 and the magnetic tape. The magnetic tape is floated above the drums 1 and 4 with a minute gap.

In order to form the rotary drum 1 having such a skirt portion 7 by so-called cutting, first, a cylinder having a height including the skirt portion 7 is formed from the material forming the rotary drum 1. Next, a cutting tool is provided at the height of the head mounting surface to which the head base 5 is mounted, and the portion other than the portion that becomes the skirt portion 7 is cut to be the same surface, leaving only the skirt portion 7 uncut. To Then, the cutting tool is released in the outer peripheral direction of the rotary head 1 without changing the height, whereby a part of the skirt portion 7 is cut out,
The magnetic head window portion 8 is formed.

In this rotary head device, the magnetic heads 6,
Since the 6 and the head base 5 do not project to the fixed drum 4 side more than the lower end of the skirt portion 7, the peripheral upper end surface of the fixed drum 4 is formed to have a flat shape. be able to. Therefore, the manufacturing of the fixed drum 4 is facilitated, and the durability of the fixed drum 4 and the size of the apparatus can be reduced.

On the other side of the head base 5, a pair of relay boards are provided so as to be on both sides of the magnetic heads 6, 6.
9,9 are installed. First and second relay conductor patterns 9a and 9b are provided on one of these relay boards 9,
On the other side, third and fourth relay conductor patterns 9c and 9d are provided. The lead wires 10 and 10 which are lead-out conductive wires drawn out from one of the magnetic heads 6 and 6 are the first
And the second relay conductor patterns 9a and 9b are connected. Further, the lead wires 10 and 10 which are lead-out lead wires drawn out from the other of the magnetic heads 6 and 6 are connected corresponding to the third and fourth relay conductor patterns 9c and 9d.

In this rotary head device, the magnetic heads 6,
Since 6 and each of the relay boards 9 and 9 are mounted on the same side of the head base, the magnetic heads 6 and 6 and the relay conductor patterns 9a, 9b, 9c and 9d Each lead wire 10 can be easily connected.

And, each of the relay conductor patterns 9a, 9b, 9c, 9d,
Each of them is connected to the rotary transformer via the relay lead wire 11.
It is connected to twelve rotating coils 12a.

The rotary transformer 12 is provided inside the fixed drum 4 and the rotary side coil 12a attached to the rotary drum 1 via a coil support cylinder 13 attached to the fixed drum 4 side of the rotary drum 1. The stationary coil 12b is housed and closely fixed to the rotating coil 12a. This rotary transformer 12 includes the coils 12a, 12 described above.
It is configured such that electric signals of a plurality of channels can be exchanged between b.

In the rotary head device according to the present invention constructed as described above, the magnetic tape to be fed is the above-mentioned drums.
The magnetic heads 6 and 6 are slidably wound on the magnetic tapes 1 and 4 in a slanting direction to the side edges of the magnetic tapes by rotating the rotary drum 1 to rotate the magnetic heads 6 and 6. Then, a so-called helical scan is performed. Then, the information signals are written and / or read by the magnetic heads 6 and 6.

As shown in FIG. 3, the rotary head device according to the present invention has a rotary drum 1 having a diameter larger than that of the rotary magnetic head device shown in FIGS. 1 and 2. Good. In this case, the above-mentioned magnetic heads 6, 6
Is attached to the head base 5 so as to project to the outer peripheral side of the rotary drum 1. Further, in this rotary head device, the fixed drum has the same outer diameter as the rotary drum 1 constituting the rotary head device.
A large diameter one is used.

H. Effect of the Invention As described above, in the rotary head device according to the present invention, the head chip is mounted on the other side surface of the head base which is mounted with one side surface facing the head mounting surface of the rotary drum. The relay conductor pattern to which the lead wire from the head chip is connected is provided on the other side surface of the head base. Therefore, in this rotary head device, the connection of the lead wire to the relay conductor pattern is facilitated.

Further, in this rotary head device, the head chip and the head base attached to the rotary drum do not protrude from the rotary drum. Therefore, it is easy to dispose the fixed drum on the side of the rotary drum to which the head base is attached, and since the shape of the fixed drum can be simplified, it is possible to ensure good durability. You can Further, since the head chip and the head base attached to the rotary drum do not project from the rotary drum, the device can be easily thinned.

That is, the present invention can provide a rotary head device which can be easily assembled and manufactured, has good durability, and can be thinned.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of the rotary head device according to the present invention, and FIG. 2 is a horizontal cross-sectional view showing the structure of the rotary head device as seen from the chassis side. FIG. 3 is a cross-sectional view showing another example of the configuration of the rotary head device as seen from the chassis side. FIG. 4 is a vertical sectional view showing the structure of a conventional rotary head device. 1 ... Rotating drum 5 ... Head base 6 ... Magnetic head 9 ... Relay board 9a ... First relay conductor pattern 9b ... Second relay conductor pattern 9c ... Third relay conductor pattern 9d …… 4th relay conductor pattern 10 …… Lead wire

Claims (1)

(57) [Scope of utility model registration request] 1. A rotary drum, comprising: a protrusion projectingly provided in a cylindrical shape on a peripheral edge side of a head mounting surface side; and a cutout portion formed by cutting out a part of the protrusion portion, and a peripheral drum upper side. A fixed drum whose end surface is formed to have a flat shape, a head base mounted with one side surface facing the head mounting surface of the rotary drum, and another side surface side facing the one side surface side of the head base. Attached to the head chip, a part of which faces the outside of the cutout portion, and a relay conductor pattern which is attached to the other side surface side of the head base and is connected by a lead wire from the head chip. The rotary head device according to claim 1, wherein the protrusion is formed so that the head chip and the head base do not protrude toward the fixed drum.