JPH01189001A - Rotary magnetic head device - Google Patents

Abstract

PURPOSE:To eliminate a transmission line, to obtain a suitability for a wideband signal transmission and, simultaneously, to cause an assembling work to be very easy by causing the conductive layer of a fixed transformer and the conductive layer of a substrate to be in contact by means of a pressing member engaged with a fixed cylinder. CONSTITUTION:A conductive layer 20 with a prescribed winding is provided on a fixed transformer 5 of a rotary magnetic head, and a second conductive layer 21 is provided on a substrate 1 to which the amplifier circuit of reproducing signals from magnetic heads 1a and 1b is mounted. The conductive layers 20 and 21 are made in contact through an elastic member 22 by a pressing member 23 engaged with a fixed cylinder 6, and an electric conduction is executed. Consequently, since the reproducing signals are impressed to the reproduction amplifier circuit in a head device, the transmission line can be widely shortened, a stray capacitance can be decreased, the suitability for the wideband signal transmission can be obtained, and simultaneously, since only the pressing is executed and a soldering is not executed, the assembly can be made very easy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary magnetic head device such as a video tape recorder, and more particularly to a rotary magnetic head device incorporating a substrate on which a reproduction amplification circuit is mounted.

[Conventional technology]

Conventionally, rotary magnetic head devices have been known as Utility Model Application No. 61-1955C15 or Japanese Patent Publication No. 61-15488 as a structure for connection with an external reproducing amplification circuit.

The former discloses a connection structure between a rotary transformer and a reproducing amplifier circuit outside the rotary magnetic head device, and the latter discloses a connection structure between a magnetic head and a rotary transformer.

[Problem to be solved by the invention]

By the way, the above-mentioned conventional technology does not take into account the length of the transmission line, and has the problem of narrowing the signal transmission band. This signal transmission band is limited by the stray capacitance of the transmission line and the inductance of the rotating transformer, and the band becomes narrow due to the stray capacitance. In the latter case, since the transmission line between the magnetic head and the rotating transformer is short, there is no stray capacitance between them, but the capacitance between the rotating transformer and the regenerative amplifier circuit is not considered. Although transmission lines have been widely put into practical use, they have the problem of being long and having a large stray capacitance.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a rotary magnetic head device that eliminates transmission lines, is suitable for wideband signal transmission, is suitable for small diameter and compact structure, and is easy to assemble.

[Means to solve the problem]

In order to achieve the above object, the present invention comprises a rotating cylinder that rotates together with a magnetic head, and a fixed cylinder that guides the magnetic tape on its outer circumferential surface, and that faces a rotating transformer attached to the rotating cylinder. In a rotating magnetic head device in which a fixed transformer is fixed to the fixed cylinder, a first conductive layer connected to the winding of the fixed transformer is disposed on the fixed transformer, and a regenerative amplifier circuit that amplifies the reproduced signal from the magnetic head. A second conductive layer is disposed on a substrate mounted with the fixed transformer, the substrate is housed in the fixed cylinder, and the first and second conductive layers are brought into contact with each other by a pressing member engaged with the fixed cylinder. This configuration allows electrical continuity between the winding and the regenerative amplifier circuit.

[Effect]

Since the present invention is configured as described above, the suppressing member is engaged with the fixed cylinder, and the board on which the regenerative amplifier circuit is mounted is pressed through the elastic member, and the fixed transformer is attached to a predetermined position. Therefore, the first conductive layer provided integrally with the fixed transformer and the second conductive layer provided on the substrate are brought into pressure contact. Thereby, the winding of the fixed transformer and the regenerative amplifier circuit are electrically connected.

Since the reproduction signal from the magnetic head is applied to the reproduction amplifier circuit within the rotating magnetic head device, the transmission line is much shorter than before, and its stray capacitance is also small.
In addition, electrical connections can be made only by pressing, and a rotating magnetic head device can be constructed without the need for soldering, making it easy to work with and having a small diameter since no soldering is required. Can be made small.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a rotating magnetic head device according to the present invention, in which Ia and Ib are magnetic heads, 2 is a rotating cylinder, 3 is a rotating transformer, 4 is a rotating disk, and 5 is a rotating magnetic head device.
is a fixed transformer, 6 is a fixed cylinder, 7 is a motor coil, 8 is a motor magnet, 9 is a regenerative amplifier circuit element, 1o
is a board, 11 is a rotating shaft, 12a, 12b are screws, 15 is a herad paste, 14 is a screw, 15 is a yoke, 16 is a screw, 17 is an FGC frequency generator) magnet, 18 is a coil board, 19 is a connector, 20 .21 is a conductive layer, 22 is an elastic member, 25 is a pressing member, and 2Sa is a hook portion.

The second factor is a main part sectional view showing the relationship between the fixed transformer and the substrate of the rotary magnetic head device according to the present invention, 25.2
6 is a winding, 27.28 is a soldering part, and 29.50 is a conductive layer. Portions corresponding to those in FIG. 1 are given the same reference numerals.

FIG. 5 is an exploded perspective view of a rotating magnetic head device according to the present invention, in which 6a is a vertical hole, 6b is a horizontal hole, 22a, 22b,
22o and 22d are elastic members, and parts corresponding to those in FIG. 1 are given the same reference numerals.

FIG. 4 is a circuit diagram of a rotating magnetic head device according to the present invention, in which 40, 41, 42, 43 are terminals, 44, 47, 4
? 45 and 46 are recording amplifier circuits, 45 and 46 are reproduction amplifier circuits, 48 are switch circuits, 50 are input terminals, 51 are terminals, 52 is a range, and the parts I/cFi corresponding to those in FIG. 1 are given the same symbols. .

In these figures, the rotating magnetic head device includes a rotating section consisting of a rotating cylinder 2 to which the magnetic heads 1 and 1b are attached, and a rotating disk 4 to which a rotating transformer 3 is attached;
It guides the tape (not shown) in each situation and consists of a fixed part consisting of a fixed cylinder 6 to which a fixed transformer 5 is attached, and a motor part consisting of a motor coil 7 and a motor magnet 8. A substrate 1o on which a regenerative amplification circuit element 9 is mounted is arranged between the fixed cylinder 6 and the fixed cylinder 6.

The rotating part rotates around a rotating shaft 11 supported by a fixed cylinder 6, and the rotating disk 4 and rotating cylinder 2 are connected to each other by a screw 12.
The magnetic heads 1a and Ib are fastened to the rotary cylinder 2 with screws 14 via a helad base 13.

For the motor part, connect the motor magnet 8 and yoke 15 with screw 1.
6, and further rotate the FG magnet 17. An FG coil board 18 is attached to the fixed cylinder 6 facing the FG magnet 17, and a rotation control signal FG for the monitor is generated.

The windings (not shown) of the magnetic heads 1a and 1b are connected to the connector 1.
It is connected to the winding (not shown) of the rotary transformer 3 via 9. Further, signals are exchanged between the rotating transformer 3 and the fixed transformer 5 by magnetic coupling. Furthermore, a first conductive layer 20 is arranged on the lower surface of the fixed transformer 5 and connected to the fixed trough 350 winding. Moreover, this first conductive layer 2
A second conductive layer 21 is provided on the substrate 10 on the opposite surface.

A suppressing member 23 is disposed at the bottom of the substrate 100 so as to sandwich a ring-shaped elastic member 22, and the substrate 10 is attached to the fixed cylinder 6.

The relationship between the fixed transformer 6 and the substrate 10 is shown in FIG. In FIG. 2, the windings 25.degree. and 26 correspond to the magnetic heads 1a and 1b, respectively. This winding 2
5 is connected to the first conductive layer 20 at the soldered part 27, and the winding 26 is connected to the opposite first conductive layer 29 and the soldered part 28.
is connected with. On the other hand, a first conductive layer 2 is provided on the substrate 10.
A second electrically conductive layer 21.30, which is opposite to 0.29, is arranged. Furthermore, an elastic member 22 is arranged on the lower surface of the substrate 10, and a suppressing member 23 that pushes up the elastic member 22 is arranged on the lower surface of this elastic member 22.

This pressing member 23 has a structure in which an elastic hook portion 25m is engaged with the fixed cylinder 6. Then, by engaging the pressing member 23 with the fixed cylinder 6), pressure is generated in the elastic member 22, and the first conductive layers 20 and 29 of the fixed transformer 6 and the second conductive layer of the substrate 10 are A pressing force of 21.30 is applied. Note that the elastic member 22. (22a,
22b, 22o.

22d) is the vertical hole 6 of the fixed cylinder 6 as shown in FIG.
a, and insert the hook portion 23a of the pressing member 23 into the vertical hole 6a. Further, the signal line 31 coming out from the board 10 is brought out of the fixed cylinder 6 through the horizontal hole 6b of the fixed cylinder 6.

Next, the circuit configuration of the embodiment configured as described above will be explained with reference to FIG.

In recording mode, transistors Q1-Q4 are turned off, transistors Q2yQs are turned on, and the recording amplifier circuit 44.47
A recording signal is applied to the magnetic heads 1a and 1b. On the other hand, in the reproduction mode, by turning on transistors Qt-Q4 and turning off transistors Q2-Qs, the signal is input to the reproduction amplifier circuits 45 and 46. This output signal is input terminal 5
A switch circuit 48 operated by a head switching signal from 0
C to select.

After further amplification in another regenerative amplification circuit 49, the signal is outputted from a terminal 51. Note that 40, 41, 42, and 43 are terminals, and these terminals 40 to 43 correspond to the conductive layers 20, 21, 29, and 50.

Further, a range 52 indicated by a broken line in FIG. 4 is mounted on the board 10. The required substrate area is approximately 500 mm, whereas when the rotating magnetic head device of this embodiment is applied to, for example, an 8 mm video, the outer circumferential diameter is 40 fins, so the outer diameter of the substrate is 56 and the inner diameter is 56 mm. It can be designed to 205m. Therefore,
Since the substrate area is about 700-, the area 5 shown in FIG.
It is possible to mount 20 circuit elements.

In the above-described embodiment configured in this way, the first conductive layers 20, 29 disposed on the fixed transformer 5 and the second conductive layers 21, 50 disposed on the substrate 10 are arranged in a laminated manner, and their bonding is performed by pressing. Since the structure is such that pressing force is generated by engaging the member 23 with the fixed cylinder 6I/c, the following effects can be obtained.

1. Since the fixed transformer 5 and the board 10 are placed close to each other, stray capacitance can be reduced compared to the conventional device, making it suitable for wideband signal transmission.

2. Since the electrical connection between the fixed transformer 5 and the substrate 10 is made by pressure contact with the suppressing member 23, it is possible to eliminate the soldering work when assembling the rotating magnetic head device, and the substrate 10 can be connected even to a small diameter cylinder such as an 8 mm video camera. can be built-in.

5. First conductive layer 20.29 and second conductive layer 21, 30
Since the pressing force is generated by simply pushing the pressing member 23 into the fixed cylinder 6, there is no need for soldering work, and workability during assembly of the rotary magnetic head device is extremely easy.

FIG. 5 is a sectional view showing another embodiment of the rotary magnetic head device according to the present invention, in which 6o is a rotary transformer, 61 is a fixed transformer, 62 is a suppressing member, 65 is a hook portion, and 64#
The first conductive layer 65 is a second conductive layer, and portions corresponding to those in FIG. 1 are given the same reference numerals.

The feature of the embodiment shown in FIG. 5 is that a cylindrical rotary transformer 60 and a fixed transformer 61 are used to sequentially move the substrate 1o on which the regenerative amplifier circuit element 9 is mounted, the elastic member 22, and the pressing member 62 upward. It is at the point where it is placed.

Further, a second conductive layer 65 is provided on the substrate 10 in contact with the first conductive layer 64 disposed on the fixed transformer 61, and a pressing member 6 is further provided with a hook portion 65 via the elastic member 22.
2 is engaged with the fixed cylinder 6. And the first and second
The pressure force of the conductive layers 64 and 65 is provided by the deformation of the elastic member 22.

In the above-described embodiment configured in this way, in addition to the effects produced by the embodiments shown in FIGS. , Ib can be effectively prevented from occurring.

Incidentally, in each of the above embodiments, the elastic member 22 and the pressing member 25 are explained as separate parts, but the present invention is not limited to this, and they may be formed integrally.

〔Effect of the invention〕

As explained above, according to the present invention, the first conductive layer of the fixed transformer and the second conductive layer of the substrate are brought into contact with each other by the suppressing member engaged with the fixed cylinder, so that the following effects can be obtained. There is.

1. Since the fixed transformer and the board are placed close to each other, stray capacitance can be reduced compared to conventional devices, making it suitable for wideband signal transmission.

Z Electrical connection between the fixed transformer and the board is made by pressure contact using a pressing member, which eliminates the need for soldering when assembling the rotating magnetic head device, making it possible to incorporate the board into small-diameter cylinders such as 8mm video cameras. do.

(5) Since the pressure contact force is generated simply by engaging the suppressing member with the fixed cylinder, there is no need for soldering work, and the workability when assembling the rotating magnetic head device is extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of a rotating magnetic head device according to the present invention, FIG. 2 is a cross-sectional view showing main parts of the device, and FIG.
4 is a circuit diagram of the same device, and FIG. 5 is a sectional view showing another embodiment of the rotary magnetic head device according to the present invention. 2... Rotating cylinder, 3, 60... Rotating transformer, 5.61... Fixed transformer, 6...
... Fixed cylinder, 10 ... Board, 20
, 29, 64...first conductive layer, 21, 30.
65... Second conductive layer, 22... Elastic member, 25... Pressing member.

Claims (1)

[Claims] 1. Consists of a rotating cylinder that rotates together with the magnetic head and a fixed cylinder that guides the magnetic tape on its outer circumferential surface.
In a rotating magnetic head device in which a fixed transformer is fixed to the fixed cylinder opposite to the rotating transformer attached to the rotating cylinder, a first conductive layer connected to the winding of the fixed transformer is disposed on the fixed transformer, and A second conductive layer is disposed on a substrate on which a reproduction amplification circuit for amplifying a reproduction signal from the magnetic head is mounted, and the substrate is built into the fixed cylinder, and the first and second conductive layers are attached to the fixed cylinder. A rotating magnetic head device characterized in that the fixed transformer winding and the regenerative amplifier circuit are electrically connected to each other by a pressing member engaged with the fixed transformer winding.