JPS63268116A - Rotary head device - Google Patents

Abstract

PURPOSE:To contrive a low cost by arranging a first core and a first coil at a rotary drum to rotate in a single body with a shaft, arranging a second core and a second coil at a fixed drum not to rotate and constituting a rotary transformer of these. CONSTITUTION:A magnetic flux A to flow from a magnetic gap 53 to a core 51 flows B into a core 92, further, flows C into a core 52 and next, flows D out from the magnetic gap 53. Into a magnetic flux B path, a loop 41 is arranged, into a magnetic flux C path, a loop 42 is arranged, an electromotive force to occur at loops 41 and 42 is added, and the current flows at a coil 32. Since for the coil 32, the extended tip comes to be a coil 13, the current flows at the coil 13 as it does, the corresponding current is outputted from a coil 14 and in the same way, the signal of other coil 33 is outputted from a coil 15. A rotary drum 3 is directly fitted at a shaft 1, a linking part 91 to rotate and move a screw 10 screwed at the drum 3 us elastically deformed and the height position of a head tip 50 is adjusted. Since a linking member 91 is facilitated to deform compared with cores 11 and 92, the distortion to the cores 11 and 92 due to the height adjustment is smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head device suitable for use in a magnetic recording/reproducing device typified by R-DAT.

[Summary of the invention]

In the present invention, a core constituting a rotor of a rotary transformer and a head are coupled by a coupling member, and the coupling member is pressed by a screw to adjust the height position of the head.

[Background technology]

FIG. 9 shows the configuration of a rotary head device of a conventional magnetic recording/reproducing device such as a video tape recorder or R-DAT. In the figure, 1 is a shaft rotated by a motor (not shown), and a flange 2 is fixed thereto. 3 is a rotating drum.

It is fixed to the flange 2 with washers 5 and screws 4. 6 is a head, which is fixed to dime 7. The dime 7 is fixed to the rotating drum 3 together with a dime base plate 19 by screws 8 and washers 9.

Reference numeral 10 denotes a screw, which is screwed onto the rotating drum 3.

By rotating this screw 10 and moving it forward and backward, it is possible to press the dime 7 and adjust the height position of the head 6. The flange 2 has a core 11 with coils 13 and 15.
is fixed with adhesive. Coil 14 facing core 11
．． A core 12 having a diameter of 16 is fixed to a stationary drum 17. The fixed drum 17 is attached to the shaft 1 so as not to rotate integrally therewith. The rotor is made up of core 11 and coil 13.15, and core 12 and coil 14.
．． 16 constitutes a stator, and both constitute a rotary transformer. The head 6 is electrically connected to the coil 13 (or 15) via a dime board 19 or a relay board 18.

FIG. 10 shows the configuration of the head 6. The pair of cores 21 are arranged to face each other so that one end forms a magnetic gap 22 . Further, the other ends 23 of the cores 21 are connected to each other, and the cores 21 form a closed magnetic path. Furthermore, a coil 24 connected to the coil 13 (or 15) is wound around the core 21.

When the shaft 1 is rotated, the rotating drum 3, head 6, core 11, and coils 13 and 15 rotate integrally. Magnetic flux from a magnetic tape (not shown) flows into one core 21 from the magnetic gap 22, flows to the other core 21, and flows out from the magnetic gap 22.

Therefore, an electromotive force is generated in the coil 24, and a signal flows to the coil 13 (or 15). This reproduction signal is output to a circuit (not shown) via the other coil 14 (or 16) constituting the rotary transformer.

Although not shown, there is another opening 180 degrees apart from the head 6.
Two heads are attached, and the reproduction output thereof is similarly supplied to an external circuit via coil 15 (or 13) and coil 16 (or 14).

When recording a signal, current flows through a path opposite to that described above.

[Problem that the invention seeks to solve]

In this way, in the conventional rotating head device, the head 6 is fixed to the dime 7, and the dime 7 is fixed to the rotating drum 3, which not only requires a large number of parts and increases costs, but also requires a large device. There are drawbacks to becoming

Therefore, the present invention realizes reduction in the number of parts, cost reduction, and miniaturization.

[Means for solving problems]

The present invention provides a rotating head device including a rotating drum attached to rotate integrally with respect to a shaft, a first core fixed to the one-rotation drum, and a first coil disposed on the first core. ``A fixed drum attached so as not to rotate integrally with respect to the shaft, a second core fixed to the fixed drum, a second coil disposed on the second core, and one end of which is connected to the second core. The device is characterized by comprising a coupling member fixed to one core, a head fixed to the other end of the coupling member, and a screw for pressing the coupling member.

(Function) A first core is fixed to a rotating drum that rotates integrally with the shaft, and a first coil is disposed on the first core.Also, a fixed drum that does not rotate integrally with the shaft has a second core fixed to it, and a second core to which the second core is fixed.
coils are arranged. A rotary transformer is configured by the first core, the first coil, the second core, and the second coil. One end of the coupling member is fixed to the first core, and a head is fixed to the other end of the coupling member.

The height of the head is adjusted by pressing the coupling member with a screw.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

In the following figures, the same reference numerals are given to the parts corresponding to those in the above case, and detailed description thereof will be omitted.

1 to 3 and 7 show a first embodiment of the present invention. In this embodiment, a core 92 dedicated to the magnetic head is provided as a bridge core in addition to the core 11 of the rotary transformer, and the core 11 and the core 92 are coupled by a coupling member 91 made of a non-magnetic material such as metal or ceramic. . A part of the coil 13 of the rotary transformer is extended as it is to form a coil 32 constituting the magnetic head. Similarly, a coil 33 is formed in the coil 15 of the other channel.

Coils 32, 33 are placed on core 92. Therefore, in this state, the coil 13 as a rotary transformer
．． 15 and coils 32 and 33 serving as magnetic heads are located on substantially the same plane.

Coil 32 (as well as coil 33) has two loops 41, 42 as shown in FIG. The loops 41 and 42 are wound so that when current flows through the coil 32, the magnetic flux output from one loop and the magnetic flux output from the other loop are in opposite directions in the figure. A head chip 50 as shown in FIGS. 4 to 6 is bonded and fixed onto the coils 32 and 33 as shown in FIG. 3.

The head chip 50 is composed of a pair of cores 51 and 52 made of ferrite or other magnetically permeable material.
1.52 are arranged to face each other so that a part thereof constitutes a magnetic gap 53. However, the portions of the cores 51 and 52 other than the magnetic gap 53 are sufficiently separated to prevent magnetic flux from flowing directly between them. In order to more effectively prevent this direct inflow and outflow of magnetic flux, a member 54 made of a non-magnetic material such as glass, metal, ceramic, etc. is filled between the cores 51 and 52 as necessary (fourth
figure). Alternatively, a conductive plate 61 made of metal, foil, conductive paint, etc. is placed on the core 51.52 to reduce upward leakage of magnetic flux due to eddy currents.
Figure 5). Head chip 5o is attached with conductive adhesive 62.
A similar effect can be obtained by adhering and fixing the coil 32 onto the protrusion 31 (FIG. 6).

Therefore, as shown in FIG.
The magnetic flux (A) flowing into the core 51 flows through the core 51.

Magnetic flux flows out from the core 51 and flows into the core 92 (B) @The magnetic flux flows in from the core 92 (B) flows within the core 92, flows out from the joint surface of the core 52, and flows into the core 52 (C),
The magnetic flux (C) flowing into the core 52 flows inside the core 52 and flows out from the magnetic gap 53 (D). The magnetic flux flows out from the core 51 and flows into the core 92 (B). A loop 41 is arranged in the path. Loop 42 is located in the magnetic flux (C) path that exits core 92 and flows into core 52 . Therefore, the electromotive forces generated in the loops 41 and 42 are added, and a current flows through the coil 32. Since the extended end of the coil 32 is the coil 13, the current in the coil 32 flows directly to the coil 13, and a corresponding current is output from the coil 14 forming the rotary transformer.

Similarly, the signal of the coil 33 of the other channel is output from the coil 15.

In the figure, the number of turns of the coils 13, 14, 15, 16, 32, and 33 is 1 turn, but it is of course possible to have 2 turns or more. Further, these coils can be formed using ordinary conductive wires, but since so-called winding work is not required, they can also be formed by printed coils, metallization, sheet metal punching, etc. In the case of the latter three, there is no need for wiring work.

The rotating drum 3 is attached directly to the shaft 1.

Rotate the screw 10 screwed into this rotating drum 3,
When moved back and forth, the coupling member 91 is elastically deformed, and the height position of the head chip 50 is adjusted. The coupling member 91 is the core 11
．． Since it is possible to use a material that is sufficiently deformable compared to 92, the strain on the core 11.92 due to this height adjustment can be reduced.

FIG. 8 shows a second embodiment. In this embodiment, coils 32 and 33 constituting two heads are connected in series, and only one channel (only coil 13) of the coil serves as a rotary transformer.As a result, the current flowing through coil 32 is will also flow. However, in R-DAT, the two rotating heads 180 degrees apart contact the magnetic tape only 90 degrees each, so if one is in use, the other is certainly not in use. Therefore, by time-sharing the input and output of the rotary transformer for one channel, signals can be recorded and reproduced in the same way as in the case of two channels. In this way, the diameter of the rotary transformer and therefore the rotating drum 3
diameter can be made smaller.

The second embodiment is less efficient than the first embodiment.

However, there are practically no problems particularly when recording and reproducing signals digitally, such as with R-DAT.

In the case of the present invention, since the magnetic circuit for the rotary transformer and the magnetic circuit for the magnetic head are separate, core materials suitable for each can be selected, and mutual interference can be eliminated.

The present invention can also be applied to a conventional magnetic head having a structure in which a coil is wound around a core. In this case as well, the number of parts can be reduced compared to the conventional case, the rotary head device can be made more compact, and costs can be reduced.

〔effect〕

As described above, the present invention provides a rotating head device including a rotating drum attached to rotate integrally with respect to a shaft, a first core fixed to the rotating drum, and a first core disposed on the first core. 1 coil, a fixed drum attached so as not to rotate integrally with respect to the shaft,
a second core fixed to a stationary drum; a second coil disposed on the second core; a coupling member having one end fixed to the first core; and a head fixed to the other end of the coupling member. and,
Since a screw for pressing the coupling member is provided, the number of parts can be reduced, and the cost and size can be reduced.

[Brief Description of the Drawings] Fig. 1 is a perspective view of the rotor of the rotating head device of the present invention, Fig. 2 is a perspective view of its coil, Fig. 3 is an assembled perspective view of the head chip and coil, and Fig. 4. is a perspective view of the head chip, FIGS. 5 and 6 are assembled perspective views of the head chip and the conductive member, and FIG. 7 is a sectional view of the rotary head device.
FIG. 8 is a perspective view of a coil of another embodiment, FIG. 9 is a sectional view of a conventional rotary head device, and FIG. 10 is a plan view of the head. 1...Shaft 2...Flange 3...Rotating drum 4...Screw 5...Washer 6...Head 7...Dime 8...Screw 9...Washer 10... Screws 11, 12...Core 13 to 16...Coil 17...Fixed drum 18...Relay board 19...Dime board 21...Core 22...Magnetic gap 23...End part 24a--Coil 32.33...Coil 41.42...Loop 50...Head chip 51.52...Core 53...Magnetic gap 54...Member 61...Conductive plate 62... ...Adhesive 72.73...Loop 91...Joining member 92...Core or above

Claims (1)

[Claims] a rotating drum attached to rotate integrally with respect to the shaft; a first core fixed to the rotating drum; a first coil disposed on the first core; a fixed drum mounted so as not to rotate integrally with the fixed drum, a second core fixed to the fixed drum, a second coil disposed on the second core, and one end of which is connected to the first core. A rotary head device comprising: a coupling member fixed to the coupling member; a head fixed to the other end of the coupling member; and a screw pressing the coupling member.