JP2595665C - - 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 a rotary head to a rotor of a rotary transformer. SUMMARY OF THE INVENTION An elastic contact is provided on one of a rotary drum side and a rotor side of a rotary transformer, and a contacted portion such as a wiring pattern that is in contact with the contact is provided on the other side. When the transformer and the transformer are assembled with each other, the contact is crimped to the contacted portion, and the connection between the head and the rotary transformer in assembling the rotary drum of the VTR is achieved by a contact integrated connector. Things. 2. Description of the Related Art In general, a VTR has 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 rotating 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, a relay board is used, and a 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 a plug pin and a socket of a connector, so that they are connected to each other when assembled. The method of connecting the magnetic head and the rotor of the rotary transformer using the relay board has a disadvantage 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, the digging of the connection method using a connector has 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 Problems The present invention provides a rotating drum on which a plurality of magnetic heads are mounted via corresponding head bases, respectively, and the plurality of magnetic heads are electrically connected to each other by elastic deformation. or comprising a plurality of contacts are arranged in correspondence with the plurality of magnetic heads to be connected
Connecting means continuous in one circumferential direction, positioning means for positioning the connecting means in the circumferential direction, a rotary transformer connected to the connecting means, and provided on a surface of the head base facing the connecting means. Said contact
And a connection pattern to which the child is elastically crimped . 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 elastic deformation, whereby the magnetic head and the rotary transformer are brought into contact. And an electrical connection is achieved. FIG. 4 shows the overall structure of a head drum device according to an embodiment of the present invention. This device comprises a rotating drum 11 having a magnetic head 10 and a coaxial shape below the rotating drum 11. And a fixed drum 12 disposed thereon. 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 connects the magnetic head 10 to the rotor 18 of the rotary transformer 17. 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 connection between the magnetic head 10 provided on the rotary drum 11 and the rotor 18 of the rotary transformer 17 will be described.
Is electrically connected using an elastically deformable contact 16 provided on the terminal plate 15. Contact 1 of terminal plate 15 shown in FIGS. 1 and 3
Reference numeral 6 denotes an L-shaped leaf spring, which is brought into contact with a connection pattern 47 provided on the surface of a head base 45 (see FIGS. 1 and 2) to which the head chip 10 is attached at the tip. Thus, the signal is transmitted, 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 connected to the boss 2
2 on top. The stator 19 of the rotary transformer 17 is attached to the lower fixed drum 12.
And the boss 22 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, it is necessary to connect the magnetic head 10 to the rotor 18 of the rotary transformer 17. 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 has the same phase with the contact 16. Therefore, when both are assembled while being positioned in the circumferential direction by the positioning pins 49 of the terminal plate 15 and the positioning holes 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 via bins 30 and 31 planted in a terminal plate 29 attached to an end of the printed circuit board 28. The tip of the printed circuit board 28 is attached to the lower surface of the lower fixed drum 12. A motor 34 is provided 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. The magnet 37 faces a coil formed on a printed circuit board 38 disposed above the magnet 37. The printed circuit board 38 is fixed to a boss 39 fixed to the upper end of the support shaft 26 via a screw 40. The terminal board 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-described configuration, a magnetic tape is helically wound around the outer peripheral surfaces of the rotating drum 11 and the fixed drum 12, which are arranged coaxially in the vertical direction. 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 a helical scan is performed. Therefore, a 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 on the magnetic tape is read by the magnetic head 10 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 a head base 45, and the head base 45 is
Is supported by the lower surface of the. 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. Further, since no solder is used for the connection between the magnetic head 10 and the rotor 18 of the rotary transformer 17, it can be used even when soldering is impossible. Since the contact pressure of the contact 16 is low, the magnetic head 1
There is no adverse effect on the mounting accuracy of 0. As described above, according to the present invention, a plurality of magnetic heads each correspond to a corresponding head base.
A rotary drum mounted through and circumferentially provided with a plurality of contacts are arranged in correspondence with a plurality of magnetic heads to be connected more and, respectively electrically magnetic head by elastic deformation Connecting means continuous in the direction , and the connecting means
A positioning means for positioning in a circumferential direction, a rotary transformer connected to the connecting means, and a contact provided on a surface of the head base facing the connecting means;
And a connection pattern that is elastically pressed . Therefore, when the rotary drum and the rotary transformer are combined with each other, the contact provided on the connecting means allows the connection pattern of the head base to hold the corresponding magnetic head.
As a result, an electrical connection can be achieved without using solder, so that assembling becomes easy and connection in a narrow space becomes possible. In addition, 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 the plurality of contacts are arranged in the connecting means so as to correspond to the plurality of magnetic heads of the rotating drum, the connection to the plurality of magnetic heads is established by the connecting means having the plurality of contacts. This makes it possible to perform the operations all at once, so that 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, and FIG. FIG. 4 is a vertical sectional view of the assembled head drum device. The names of the main parts in the drawings are as follows. DESCRIPTION OF SYMBOLS 10 ... Magnetic head 11 ... Rotary drum 15 ... Terminal plate 16 ... Contact 17 ... Rotary transformer 18 ... Rotor 45 ... Head base 47 ... Connection pattern (subject 50) Terminal

Claims (1)

[Claims] 1. A rotating drum on which a plurality of magnetic heads are respectively mounted via corresponding head bases; and a plurality of magnetic heads corresponding to the plurality of magnetic heads so as to be electrically connected to the plurality of magnetic heads by being elastically deformed. Do you have multiple contacts arranged ?
Connecting means continuous in one circumferential direction, positioning means for positioning the connecting means in the circumferential direction, a rotary transformer connected to the connecting means, and provided on a surface of the head base facing the connecting means. Said contact
And a connection pattern to which the child is elastically crimped .