JP2595665B2 - Rotating head device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head device, and more particularly to a structure for connecting a magnetic head mounted on the rotary head device and a rotor of a rotary transformer.

SUMMARY OF THE INVENTION An elastic contact is provided on one of a rotating drum side and a rotor side of a rotary transformer, and a contacted portion such as a wiring pattern that contacts the contact is provided on the other side. When the transformer and the transformer are assembled together, the contact is crimped to the contacted part.
The connection between the head and the rotary transformer in assembling the rotary drum of R is achieved by a contact-type integrated connector.

[Conventional technology]

Generally, a VTR includes a rotating drum having a magnetic head and a fixed drum disposed below the rotating drum, and a magnetic tape is helically wound around these drums. When the rotary drum is driven to rotate, the magnetic head mounted on the drum scans over the magnetic tape, thereby achieving a helical scan. The magnetic head is connected to a rotor of a rotary transformer, and the magnetic head transmits and receives signals between the point side and the fixed side via the rotary transformer.

Therefore, according to such a VTR, it is necessary to electrically connect the magnetic head and the rotor of the rotary transformer to each other. Therefore, conventionally, the relay board is used.
The lead wire drawn from the video head is soldered to the relay board. Further, lead wires drawn from the rotary transformer are also soldered to the relay board. As a method not using a relay board, there is a structure using a connector. This structure uses the plug pin and socket of the connector,
When they are assembled, they are connected to each other.

[Problems to be solved by the invention]

The method of connecting the magnetic head and the rotor of the rotary transformer using the relay board has a drawback that the work becomes difficult when the diameter of the rotating drum is reduced. In addition, there is a problem that solder flux and solder balls generated by soldering are easily mixed into the inside of the drum. On the other hand, in the case of the connection method using a connector, there is a drawback that the insertion force is high and a load is applied to a bearing or the like, which has an adverse effect. That is, there is a problem that the magnetic head mounted with high accuracy moves due to such a force and causes a positional shift.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and aims to easily and reliably connect a magnetic head mounted on a rotary drum to a rotor of a rotary transformer even in a small space, and to reduce a contact pressure. It is an object of the present invention to provide a rotary head device in which the head mounting accuracy is reduced so as not to adversely affect the mounting accuracy of the head.

[Means for solving the problem]

According to the present invention, a rotating drum on which a plurality of magnetic heads are mounted is arranged corresponding to the plurality of magnetic heads so as to be electrically connected to the plurality of magnetic heads by being elastically deformed. The present invention relates to a rotary head device including: a connection unit having a plurality of contacts; and a rotary transformer connected to the connection unit.

[Action]

Therefore, when the rotary drum and the rotary transformer are assembled with each other, the contact of the connecting means connected to the rotary transformer comes into contact with the corresponding magnetic head by being elastically deformed. Connection is achieved.

〔Example〕

FIG. 4 shows the overall structure of a head drum device according to an embodiment of the present invention, which device is a magnetic head device.
The rotating drum 11 includes a rotating drum 11 and a stationary drum 12 disposed coaxially below the rotating drum 11. The magnetic head 10 is attached to the tip of the head base 13, and the head base 13 is fixed to the lower surface of the rotating drum 11 by screws 14. The contact 16 attached to the terminal plate 15 is connected to the magnetic head 10 and the rotary transformer.
17 is connected to the rotor 18. The rotary transformer 17 is for transmitting and receiving signals between the rotating side and the fixed side. The rotor 18 is mounted on the head drum 11 side, and the lower stator 19 is mounted on the fixed drum 12 side. And oppose each other via a minute air gap.

Next, the magnetic head provided on the rotating drum 11
The connection between the rotor 10 and the rotor 18 of the rotary transformer 17 will be described.The magnetic head 10 and the rotor 18 are electrically connected using an elastically deformable contact 16 provided on a terminal plate 15. Has become. The contact 16 of the terminal plate 15 shown in FIGS. 1 and 3 is formed of an L-shaped leaf spring, and has a head base 45 (FIGS. 1 and 2) to which the head chip 10 is attached at the tip. The signal is transmitted by making contact with a connection pattern 47 provided on the surface of the reference pattern), and the connection pattern 47 constitutes a contacted portion. With such a structure, when the magnetic head 10 attached to the rotary drum 11 is assembled into the boss 22, it is possible to simultaneously connect the rotary transformer 17 to the rotor 18.

The terminal plate 15 is mounted on the upper surface of the rotor 18 of the rotary transformer 17, and the lead wire of the coil of the rotor 18 is soldered to the terminal 50 of the terminal plate 15. Then, the rotor 18 to which the terminal plate 15 is attached is mounted on the boss 22 connected to the support shaft 26. The stator 19 of the rotary transformer 17 is attached to the lower fixed drum 12, and the rotor 18 and the boss 22 of the rotary transformer 17 are assembled by press fitting. Further, the rotary drum 11 is incorporated into the boss 22 to complete the head drum device as shown in FIG.

When the rotary drum 11 is assembled, the magnetic head
The connection between 10 and the rotor 18 of the total transformer 17 is required. The same number of leaf springs 16 as the magnetic head 10 are arranged on the terminal plate 15 at predetermined positions in the circumferential direction, and the contact portions of the contacts 16 formed of leaf springs are plated with gold. The corresponding connection pattern 47 of the head base 45 is also plated with gold, and this portion 47 makes the contact 16 in phase. Therefore, when both are assembled while being positioned in the circumferential direction by the positioning pin 49 of the terminal plate 15 and the positioning hole 48 of the rotary drum 11, the gap between the rotor 18 and the stator 19 of the rotary transformer 17 becomes constant, The contact 16 having a stroke longer than the gap is elastically deformed, and the elastic restoring force causes the contact 16 to be pressed against the connection pattern 47 constituting the contacted portion of the head base 45 with an appropriate contact pressure. And electrical connection is achieved.

The rotating drum 11 having the magnetic head 10 is mounted on a boss 22 as shown in FIG. The rotating drum 11 is fixed to the boss 22 by screws 23. The boss 22 is rotatably supported on a support shaft 26 by a pair of upper and lower ball bearings 24 and 25. The lower end portion of the support shaft 26 is press-fitted into a hole 27 formed in the center of the fixed drum 12. A flexible printed circuit board 28 is attached to the lower side of the fixed drum 12, and pins 30, which are planted on a terminal plate 29 attached to an end of the printed circuit board 28,
The front end of the printed circuit board 28 via the lower fixed drum 31
It can be attached to the lower surface of 12.

A motor 34 is disposed inside the rotary drum 11, and the rotary drum 11 is driven to rotate by the motor 34. That is, the rotor yoke 35 is fixed to the rotating drum 11 by the screw 36, and the magnet 37 is fixed to the yoke 35. And magnet 37
Is opposed to the coil formed on the printed circuit board 38 disposed on the upper side. Printed board
Numeral 38 is fixed to a boss 39 fixed to the upper end of the support shaft 26 via a screw 40. A terminal plate 42 attached to the tip of the flexible board 41 is fixed to the boss 39, and the coil of the printed board 38 is energized through the flexible board 41. .

In the above configuration, a magnetic tape is helically wound around the outer peripheral surfaces of the rotating drum 11 and the fixed drum 12, which are vertically coaxially arranged. In this state, the rotating drum 11 is rotated by the motor 34. 11 is driven to rotate. Then, the magnetic head 10 supported on the drum 11 via the base 13 scans the surface of the magnetic tape obliquely, and the helical scan is performed. Therefore, the signal supplied from the fixed side via the rotary transformer 17 is applied to the magnetic head 10, and the magnetic head 10 records the signal on the magnetic tape. Alternatively, the signal is read by the magnetic head 10 onto the magnetic tape, and the signal is supplied to the fixed side through the rotary transformer 17. Thus, predetermined recording and / or reproduction is performed.

In such a VTR, the magnetic head 10 is attached to the tip of the head base 45, and the head base 45 is supported on the lower surface of the rotating drum 11 by screws 46. Then, by assembling the rotary drum 11 with the rotary transformer 17, the contact 16 of the terminal plate 15 attached to the upper surface of the rotor 18 of the rotary transformer 17 elastically contacts the connection pattern 47 of the head base 45, Thereby, an electrical connection is achieved. Therefore, assembling of the head drum device becomes very easy, and connection in a narrow space becomes possible. The magnetic head 10 and the rotor 18 of the rotary transformer 17
Since no solder is used for the connection between them, it can be used even when soldering is not possible. Further, since the contact pressure of the contact 16 is low, the mounting accuracy of the magnetic head 10 is not adversely affected.

[Application example]

Although the present invention has been described with reference to one embodiment shown in the drawings, the present invention is not limited to the above embodiment, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, the contacted portion 47 is formed on the head base 45 side supporting the magnetic head 10 and the contact 16 is provided on the terminal plate 15 incorporated in the rotor 18 of the rotary transformer 17. The positional relationship between the contact 16 and the contacted portion 47 may be opposite to each other.

〔The invention's effect〕

As described above, the present invention provides a rotating drum on which a plurality of magnetic heads are mounted, and a plurality of magnetic heads which are arranged so as to be electrically connected to the plurality of magnetic heads by being elastically deformed. The present invention relates to a rotary head device including a connecting means having a plurality of contacts, and a rotary transformer connected to the connecting means.

Therefore, when the rotary drum and the rotary transformer are combined with each other, the contact provided on the connecting means comes into contact with the corresponding magnetic head while being elastically deformed,
As a result, electrical connection can be achieved without using solder, which facilitates assembling and enables connection in a narrow space. Also, by reducing the contact pressure of the contact, the mounting accuracy of the magnetic head is not adversely affected.

In particular, in the present invention, since a plurality of contacts are arranged so as to correspond to a plurality of magnetic heads of the rotating drum, connection to the plurality of magnetic heads can be performed at once using a contact means having a plurality of contacts. In this way, the efficiency of the assembling work becomes extremely high, and the serviceability is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a connection between a magnetic head and a rotary transformer according to an embodiment of the present invention, FIG. 2 is a bottom view of a rotary drum, FIG. 3 is a plan view of a terminal plate, and FIG. It is a longitudinal section of the assembled head drum device. The names of the main parts in the drawings are as follows. 10 Magnetic head 11 Rotary drum 15 Terminal plate 16 Contact 17 Rotary transformer 18 Rotor 45 Head base 47 Connection pattern (contacted part) 50 Terminal

Claims (1)

(57) [Claims] A rotating drum on which a plurality of magnetic heads are mounted; and a plurality of magnetic heads arranged to be electrically connected to the plurality of magnetic heads by being elastically deformed. A rotary head device, comprising: a connecting means having a plurality of contacts; and a rotary transformer connected to the connecting means.