JP2513948Y2 - Rotating head device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head device having a small diameter, and more particularly to a rotary head device in which a rotary transformer and a head can be easily connected.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view showing a conventional rotary head device for VTR or DAT. In the conventional rotary head device 20 shown in FIG. 7, reference numeral 21 is a fixed drum. A bearing 23 is provided in the center of the fixed drum 21 via a sleeve 22.
A shaft 25 is rotatably supported on the shaft. The rotary drum 24 is fixed to the upper end of the shaft 25. The shaft 25 and the rotary drum 24 are fixed by heat fitting or press fitting. A drive unit of a motor is provided in the lower portion of the shaft 25 indicated by M, and the rotary drum 24 is driven together with the shaft 25 by the power of the motor.

FIG. 8 is a schematic exploded sectional view of the rotary drum side (however, the vertical direction is opposite to that of FIG. 7). On the bottom surface (the surface on the fixed drum side) of the rotary drum 24, there is formed a projection 24d centering on the shaft fixing hole 24a for fixing the shaft 25 and projecting in the direction of the fixed drum from the periphery thereof. The surface 24b is formed. Further, a head base plate support surface 24c is formed on the outer periphery of the transformer support surface 24b.

Reference numeral 27 is a head base plate. A thin film substrate 28 is adhered to the surface of the head base plate 27 on the fixed drum side,
Further, the head chip H is adhered and fixed to the same surface. The head chip H and the thin film substrate 28 are electrically connected by solder or the like.

A mounting hole 2 is provided at the center of the head base plate 27.
7a is provided. Fixing screw 2 in this mounting hole 27a
9 is inserted and screwed into the female screw 24f of the rotary drum 24, and the head base plate 27 is fixed to the head base plate support surface 24c of the rotary drum 24. A female screw 24g is formed at a position aligned with the female screw 24f, and an adjusting screw 31 is formed on the female screw 24g.
Is screwed on. As shown in FIG. 7, the tip of the adjusting screw 31 hits the surface of the head base plate 27 opposite to the side where the head chip H is attached, and the head chip H is passed through the head base plate 27.
Abutting against pushing the back of. When the tip of the adjusting screw 31 presses the head base plate 27, the head base plate 27 is deformed and the height of the head chip H is adjusted. The head chip H is exposed from the head window 24e of the rotary drum 24 (see FIG. 7).

Reference numeral 32 is a rotation side transformer. The coil C is wound around the rotation side transformer 32 in a circumferential groove 32c formed in the fixed drum direction. And
The rotation side transformer 32 is directly fixed to the transformer support surface 24b of the rotary drum 24 by adhesion or the like, and the head base plate 27 is attached to the head base plate support surface 24c having a step with the transformer support surface 24b.

Further, as shown in FIG. 8, since the thin film substrate 28 adhered to the head base plate 27 and the rotating side transformer 32 are in a facing state, they are directly connected by the lead wire 33.

Further, as shown in FIG. 7, the fixed drum 21
A transformer supporting surface 21a is also formed on the bottom surface of the concave portion, and a fixed side transformer 36 is adhesively fixed to the transformer supporting surface 21a via a spacer 35 for height adjustment. Also in this fixed side transformer 36, the coil C is wound around the circumferential groove 36c formed on the rotary drum side. Lead wire 37 extending from the fixed transformer 36
(The end of the coil C may be pulled out)
It is led out to the outside from the notch 21b of the fixed drum 21.

[0009]

However, as described above, the connection between the head chip H (the thin film substrate 28 as described above) and the rotary side transformer 32 is individually connected by the lead wires 33 in the facing state. There is. Therefore, the lead wire 3 drawn from the coil of the transformer 32
The thin film substrate 2 on the head base plate 27
Positioning is performed at the connection point (not shown) of 8 and soldering is performed, and the work is complicated. Further, recently, with the miniaturization of the rotary head device, the diameter of the rotary drum 24 has been reduced, and the distance between the head base plate 27 and the rotary side transformer 32 has been reduced. Will be done and the work will be difficult.

Further, in the assembled state, the lead wires 33 are densely pushed between the head base plate 27 and the transformer 32, which may interfere with the subsequent work.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a rotary head device in which a rotary transformer and a head chip can be easily connected.

[0012]

According to the present invention, a fixed drum, a rotary drum that rotates at a coaxial position with the fixed drum, a head supported by the rotary drum, a fixed transformer facing each other, and In the rotary head device provided with a rotary side transformer, the rotary drum
A flexible printed wiring board is fixed to the
The signal line from the head is conducted to the printed wiring board of
Is provided, and the land of the printed wiring board is provided.
The part extending from the rolling drum is inverted and bent,
The rotating side transversal part in which the stripped portion faces the rotating drum.
Attached to the transformer and the lead from the rotating transformer is in front
It is electrically connected to the serial printed circuit board, the rotation-side transformer and said head is characterized in that it is connected through the printed circuit board.

[0013]

In the above means, since the flexible printed wiring board is used to connect the head and the rotating side transformer, for example, the head side and the rotating side transformer side are connected in advance by the flexible printed wiring board, and the flexible printed wiring board is flexible. By folding the printed wiring board and attaching the transformer to the rotary drum, it becomes possible to easily connect the two and to position the transformer and the rotary drum.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a sectional view of a rotary head device according to an embodiment of the present invention, FIG. 2 is a bottom view of a rotary drum as seen from a fixed drum side, FIG. 3 is a plan view showing a flexible printed wiring board, and FIG. 4 is a flexible printed board. FIG. 5 is a plan view showing a connection state of the head chip, the flexible printed wiring board, and the rotation side transformer. Since the rotary head device of this embodiment and the rotary head device 20 shown in FIG. 7 have substantially the same structure, only the essential parts will be described, and the same members will be denoted by the same reference numerals and detailed description thereof will be omitted.

The difference between the rotary head device 1 shown in FIG. 1 and the rotary head device 20 described above is that the rotary side transformer 3 is used.
2 and the head chip H are connected via the flexible printed wiring board 2.

The flexible printed wiring board 2 shown in FIG. 3 is formed of a thin resin sheet which is easily deformed. The flexible wiring board 2 has a hole 3 formed therein. When the printed wiring board 2 is installed on the rotary drum 24 shown in FIG. 2, the transformer supporting surface 24b of the drum and the connecting portions 28a to 28d of the thin film substrate 28 provided on the head base plate 27 (head chip described later). (H is electrically connected to the signal line L), and the fixing screw 29 and the like can be exposed from the hole 3.

On the other surface of the printed wiring board 2,
Wiring patterns 4 to 7 for transmitting signals of the head chip H are formed. It lands 4a to 7a of the end portion of the wiring patterns 4 through 7 is located in the inner edge of the hole 3, when installed on the rotary drum 24, the lands 4 a to 7 a is, the upper head base plate 27 Thin film substrate 28
Adjacent to the connecting portions 28a to 28d of the connecting portions 28a to 28d and the lands 4 a to 7 a is adapted to be soldered.

Other lands 4 of the wiring patterns 4 to 7
b to 7b are formed on the lower edge of the printed wiring board 2 shown in FIG. The end portion of the lead wire 33 extending from the coil provided on the rotating-side transformer 32 has the land 4b.
To 7b.

As shown in FIG. 4, an adhesive member 9 such as a double-sided adhesive tape (a portion indicated by hatched portions) is provided on the back surface of the printed wiring board 2 and adheres to the rotary drum 24 and the rotary side transformer 32. It is possible. As for the adhesion part, the A1 surface on which the adhesion member 9 is provided is shown in FIG.
At, the B1 surface of the rotary drum 24 is bonded, and the A2 surface is similarly bonded to the B2 surface of the rotary drum 24. Also A3
As shown in FIG. 6, the surface is the back surface B of the rotation side transformer 32.
Bonded to 3.

In FIG. 3, reference numeral 8 in the drawing is a balance pattern provided to secure the rotational balance,
For example, solder can be welded to secure the rotation balance. The balance pattern 8 is for balancing the load on the protruding portion indicated by A3 of the printed wiring board 2 and the solder attached to the lands 4b to 7b of the protruding portion.

Next, an example of a method of assembling the rotary head device 1 will be described with reference to FIGS. 5 and 6. As shown in FIG. 5, a portion B3 of the back surface of the printed wiring board 2 is attached to the back surface B3 of the rotation side transformer 32 by an adhesive member 9.
Glue to Then, the lead wire 33 of the coil C wound in the groove 32c of the rotation side transformer 32 is connected to the hole 3 of the transformer.
The lead wire 33 is led out to the back surface from 2a and soldered to the lands 4b to 7b of the printed wiring board 2. After or before the connection between the printed wiring board 2 and the transformer 32, the hole portion 3 of the printed wiring board 2 is fitted into the outer periphery of the protrusion 24d of the rotary drum 24 on which the transformer support surface 24b is formed, The A1 surface and the A2 surface of the printed wiring board 2 are attached to the rotary drum 24 by the adhesive member 9.
Adhere to B1 side and B2 side. At this time, the protrusion 24d
The printed wiring board 2 can be positioned on the side of the rotary drum by fitting the hole 3 into the hole. The portion A4 of the printed wiring board 2 overlaps the thin film substrate 28 on the head base plate 27. Then, the lands 4a to 7a of the printed wiring board 2 and the connecting portions 28a to 28d of the thin film substrate 28 are connected by soldering. As shown in FIG. 2, the head chip H is electrically connected to the wiring patterns 4 to 7 of the printed wiring board 2 via the lead wire L, the pattern of the thin film substrate 28, and the soldering portion.

Then, as shown in FIG. 6, the printed wiring board 2 is bent at a predetermined bending position so that the rear surface of the rotary side transformer 32 is covered with the transformer support surface 24 of the rotary drum 24.
Then, the transformer 32 is brought into contact with b and fixed to the transformer support surface 24b by adhesion or the like. On the other hand, the bearing 23, the shaft 25 and the sleeve 22 are inserted into the fixed drum 21 in an integrated state. Further, the fixed-side transformer 36 is adhered to the transformer supporting surface 21a via the spacer 35. Then, the rotary drum 24 assembled as described above is fixed to the upper portion of the shaft 25 by shrink fitting or the like.
Built in 1.

As described above, by using the printed wiring board 2, the lead wire 33 from the coil of the rotation side transformer 32 is not extended more than necessary, and
Further, the wiring is completed without performing the soldering work in the narrow position, so that the workability is improved. Also, the rotating drum 2
Since the printed wiring board 2 can be positioned on the fourth side, the lands 4a to 7a and the thin film substrate 28 can be positioned.
The positioning with the connecting portions 28a to 28d can be performed at the same time, and the connecting work can be facilitated. As described above in detail, according to the rotary drum device 1 of the above-described embodiment, the rotation side transformer 32 and the head chip H can be easily connected.

[0024]

As described above, in the present invention , as shown in FIG.
Adhere the printed wiring board to the rotating drum as shown, etc.
Fix with and print the signal line from the head
Conducted to the land part of the wiring board, and also printed wiring board
Attach the other part of the
Connect the card to the printed wiring board and print in that state
Bend the wiring board and fix the rotating transformer to the rotating drum.
The rotating drum and the rotating side
You can complete the wiring with the device. In this way, the printed wiring board
The board is fixed to the fixed drum, and the printed wiring board is inverted.
Then, by bending it,
Wiring in a narrow space can be performed easily.
In addition, due to the printed wiring board in this narrow space
The wiring can be intervened efficiently in space .

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary head device according to an embodiment of the present invention.

FIG. 2 is a bottom view of the rotary drum as viewed from the fixed drum side.

FIG. 3 is a plan view showing a flexible printed wiring board.

FIG. 4 is a rear view of the above.

FIG. 5 is a plan view showing a connection state of a head chip, a flexible printed wiring board, and a rotation side transformer.

FIG. 6 is a schematic perspective view showing a connection state of a head chip, a flexible printed wiring board, and a rotating transformer.

FIG. 7 is a cross-sectional view showing a conventional rotary head device.

FIG. 8 is a schematic exploded sectional view of a rotary drum side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary head device 2 flexible printed wiring boards 4 to 7 wiring pattern H head chip 21 fixed drum 24 rotary drum 24b transformer support surface 28 thin film substrate 32 rotary side transformer 36 fixed side transformer

Claims (1)

(57) [Scope of utility model registration request] 1. A rotation provided with a fixed drum, a rotary drum rotating coaxially with the fixed drum, a head supported by the rotary drum, a fixed transformer and a rotary transformer facing each other. In the head device, flexible printed wiring is provided on the rotary drum.
The board is fixed and the head is
The land portion through which the signal line from the
The part of the printed wiring board extending from the rotating drum is reversed
And then the bent part faces the rotating drum.
Attached to the rotation side transformer and
Lead from the sensor is connected to the printed wiring board.
Te, rotating head device, wherein the rotation-side transformer and said head are connected via the printed wiring board.