JP2000155917A - Rotary head drum device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily attain the multi-channel of a small rotary drum and the exchange of a magnetic head. SOLUTION: A rotary disk is attached to a fixed shaft 7 interfit into a fixed drum 3, and a rotary drum 2 fixed to the upper part of the rotary disk 4 is held so as to be freely rotatable. A plurality of magnetic heads 1 are mounted to the outer peripheral part of the rotary drum 2, and a through-hole 2b is formed in the neighborhood of the magnetic head 1. A relay terminal pig 14 is inserted into a guide 12 as a relay member 15, and press fit into the through- hole 2b. The ultrasonic connection of the lower edge face of the relay terminal pin 14 through a wire 9 with a land part formed at a head base 1e is operated. Thus, a space can be formed in the neighborhood of the through-hole 2b, and each kind of tool can be easily set. Also, at the time of exchanging the magnetic head 1, the head base 1e is removed by pulling the wire 9 without removing the relay member 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head drum device of a digital VTR or DAT which has a high recording density and records and reproduces information at a high data rate, and more particularly to an electrical connection between a magnetic head and a rotary transformer. The present invention relates to a technique for improving a simple connection method.

[0002]

2. Description of the Related Art As represented by a VHS type VTR, a general electrical connection method between a magnetic head and a rotary transformer is to solder a terminal plate of a magnetic head and a tin-plated steel wire, and to form a tin-plated steel wire. Is connected to a rotary transformer integrated with the rotary drum.

FIG. 6 is a sectional view of a conventional rotary head drum device, and FIG. 7 is a perspective view showing a wiring state near a magnetic head. As shown in FIG. 6 and FIG.
A plurality of magnetic heads 1 are arranged on the outer periphery of the head. The rotating drum 2 is a rotating disk 4 on which a magnet is mounted.
It rotates with one. The bearing 6 is fitted into a fixed shaft 7 attached to the solid drum 3, and the rotating disk 4
Is press-fitted into the outer ring of the bearing 6 so as to be rotatable with respect to the fixed shaft 7 of the fixed drum 3.

The magnetic head 1 records or reproduces a signal, and a head core 1 a is attached to a head base 1 e so as to protrude from the outer peripheral portion of the rotary drum 2. The winding 1b is wound around the head core 1a, and the end of the winding 1b is soldered to the relay terminal plate 1c fixed to the lower surface of the head base 1e. In the vicinity of the magnetic head 1, a through hole 2b is formed in parallel with the center axis of the rotary drum 2, and an L-shaped pin 13 held by a guide 12 is inserted into the through hole 2b. The L-shaped pin 13 is usually made of a tin-plated steel wire, is bent into an L-shape on the magnetic head 1 side as shown in FIG. 7, and is soldered to the land 1d of the relay terminal plate 1c. The other end of the L-shaped pin 13 is lifted above the rotary drum 2 as shown in FIG.

[0005]

The other end of the L-shaped pin 13 is soldered to a terminal of a rotor-side coil of a rotary transformer 8 fixed on the upper side of the rotary drum 2. When the diameter of the rotary drum is as large as 62 mm as in the VHS type VTR, the land 1d of the relay terminal plate 1c to be soldered can be enlarged, so that the winding and the L-shaped pins 13 can be easily soldered. Can be done. Also, when the magnetic head 1 is replaced, since the distance between the magnetic heads 1 is large, the L-shaped pin 13 with the above-mentioned guide 12 is easily pulled out from the through hole 2b and a space is provided near the magnetic head 1. Can be made. When the magnetic head 1 is adjusted, the angle of the head is determined, and a chucking jig is attached using this space. In the case of such a large rotary head drum device, the guide 12
There is no problem even if the L-shaped pin 13 held in the above is used.

When the number of magnetic heads 1 of the rotary drum 2 is small, a large land portion 1d of the relay terminal plate 1c can be secured. Further, since the mounting interval of the magnetic head 1 is wide, the head can be easily replaced. However, when the number of magnetic heads increases due to the reduction in the size and weight of the rotating drum device and the increase in the number of recording channels as in recent digital recording / reproducing devices, the space for installing the chucking jig as described above cannot be secured. In addition, there is a problem that a large number of man-hours are required for replacing the head.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a small rotating drum, which is excellent in assemblability of the rotating drum even when the number of magnetic heads is increased. It is another object of the present invention to provide a rotary head drum device capable of easily adjusting and replacing the position of a magnetic head.

[0008]

According to a first aspect of the present invention, there is provided a fixed drum provided with a lead for winding and guiding a magnetic tape and a driving coil for generating a rotating magnetic field. A rotating disk, which is rotatably held coaxially with the center axis of the fixed drum and has a magnet fixed at a position facing the drive coil, and is formed in a cup shape so as to helically scan the magnetic tape during rotation; A rotary drum that rotates integrally with a rotary disk, a rotary transformer that is mounted at a position facing the rotary drum and the fixed drum, and that inputs and outputs signals by electromagnetic coupling, and a head that is formed in the radial direction of the rotary drum A plurality of magnetic heads mounted on a mounting surface; and A rotary head drum device comprising: a plurality of through-holes penetrated through; and a relay member inserted into the through-hole and connecting the winding of the magnetic head and the rotary transformer. A head core on which a winding for recording or reproduction is wound, and a head base attached to the head mounting surface of the rotary drum so as to be finely adjustable, and holding the head core on an upper surface,
A relay terminal plate fixed to a lower surface of the head base and formed with a plurality of lands for connecting windings of the head core and metal wires, wherein the relay member is an insulating member. A guide having a pin hole formed in the axial direction, wherein the length of the guide hole is shorter than the length of the through hole, and the pin hole of the guide is formed so as not to protrude from the head mounting surface. A relay terminal pin connected at one end to the land portion of the relay terminal plate via the metal wire and the other end connected to the rotary transformer. It is characterized by the following.

According to a second aspect of the present invention, in the rotary head drum device of the first aspect, a connection surface of a land formed on the relay terminal plate is formed of gold or aluminum. Is what you do.

According to a third aspect of the present invention, in the rotary head drum device of the first aspect, the connection surface of the relay terminal pin is formed of gold or aluminum.

According to a fourth aspect of the present invention, in the rotary head drum device according to the first aspect, when a land formed on the relay terminal plate and a connection surface of the relay terminal pin are connected by a metal wire, It is characterized by joining by ultrasonic vibration or heating.

According to a fifth aspect of the present invention, there is provided a fixed drum provided with a lead for windingly guiding a magnetic tape and a driving coil for generating a rotating magnetic field, and rotatably held coaxially with the center axis of the fixed drum. A rotating disk having a magnet fixed to a position facing the drive coil, a rotating drum formed in a cup shape so as to helically scan the magnetic tape during rotation, and rotating integrally with the rotating disk,
A rotary transformer mounted at a position facing the rotating drum and the fixed drum, for inputting and outputting signals by electromagnetic coupling, and a plurality of magnetic heads mounted on a head mounting surface formed in a radial direction of the rotating drum. A plurality of through-holes provided in the vicinity of each of the magnetic heads and penetrating from the head mounting surface of the rotary drum to the back surface thereof; and a winding of the magnetic head and the rotary transformer inserted into the through-holes. And a relay member for connection, wherein the magnetic head is attached to a head core on which a recording or reproducing winding is wound and a head mounting surface of the rotary drum so as to be finely adjustable. A head base for holding the head core on the upper surface, and a head core fixed to the lower surface of the head base, A relay terminal plate formed with a plurality of lands for connecting ears, wherein the relay member is press-fitted into the through hole using an insulating member, and has an axial length. A guide shorter than the hole length of the through hole and having a pin hole formed in the axial direction, and a conductive pin-shaped member inserted into the pin hole of the guide so as not to protrude from the head mounting surface, The relay terminal pin is attached so as to protrude from one end face of the guide, the other end protrudes from the other end face of the guide and is connected to the rotor side coil, and a pipe bent into an L-shape. An inner diameter is slightly larger than an outer diameter of the relay terminal pin, one end of the pipe abuts a land portion of the relay terminal plate, and the other end of the pipe has an L-shaped pipe inserted into the relay terminal pin. Features It is intended to.

According to a sixth aspect of the present invention, in the rotary head drum device according to the fifth aspect, one end of the L-shaped pipe whose central portion is pre-filled with solder is brought into contact with a land portion of the relay terminal plate. And the other end of the L-shaped pipe is inserted into the relay terminal pin to melt the filled solder, thereby connecting the winding of the head core and the rotary transformer. It is.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary head drum device according to each embodiment of the present invention will be described below with reference to the drawings. The same parts as those of the conventional rotary head drum device are denoted by the same reference numerals, and the description of the same parts as those of the conventional example will be omitted.

(Embodiment 1) A rotary head drum device according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view showing a configuration of a rotary head drum device according to the first embodiment, and FIG. 2 is a partially enlarged sectional view showing a structure around a magnetic head. FIG. 3 is an enlarged perspective view of the rotary drum device centering on a mounting portion of the magnetic head. On the lower surface of the rotary drum 2 shown in FIG. 2, a head mounting surface 2a that is flat in the radial direction is formed. As shown in FIGS. 1 and 3, a plurality of magnetic heads 1 are mounted near the outer peripheral portion of the head mounting surface 2 a, and the rotating drum 2 and the rotating disk 4 rotate integrally with the fixed drum 3. It is configured.

A fixed shaft 7 is press-fitted into a center hole of the fixed drum 3 located on the lower side of FIG. Two bearings 6 are fitted into the center of the fixed shaft 7. The bearing 6 is a rolling bearing such as a ball bearing, and its outer ring is attached to the center hole of the rotating disk 4 by bonding or shrink fitting. A magnet is fixed to the lower surface of the rotating disk 4, and a printed board having a driving coil for generating a rotating magnetic field is attached to the upper portion of the fixed drum 3.
Then, the rotating disk 4 is rotated by the rotating magnetic field acting between them.

The rotary drum 2 is a cup-shaped drum for helically scanning a magnetic tape. A cylindrical contact surface is formed on the outer peripheral side surface of the rotating drum 2 so as to slide on the magnetic tape. A plurality of magnetic heads 1 are mounted on the lower surface of the rotary drum 2, that is, on the head mounting surface 2a shown on the upper side in FIG. A through hole 2b is provided in the head mounting surface 2a near the magnetic head 1, and the relay member 15 is inserted into the through hole 2b. As shown in FIG. 2, the relay member 15 includes a relay terminal pin 14, a guide 12, and a terminal plate 16. The guide 12 is formed into a cylindrical shape using an insulating member so as to be press-fittable into the through hole 2b, has a length in the axial direction shorter than the length of the through hole 2b, and has a pin hole formed in the axial direction. is there. The relay terminal pin 14 is a conductive rod-shaped member inserted into a pin hole of the guide 12, one end of which is connected to the land of the relay terminal plate 1c via the wire 9, and the other end of which is connected to the rotor side coil. Is what is done.

The relay member 15 can also be manufactured by insert molding using a rod-shaped relay terminal pin 14, a guide 12 made of insulating resin, and a terminal plate 16. The lower end surface of the relay terminal pin 14 and the lower end surface of the guide 12 are flush with each other, and the lower end surface of the relay terminal pin 14 is a land portion 14a for connecting the wire 9 as shown in FIG. ing. The relay member 15 is positioned with respect to the through hole 2b so as to be depressed inward from the head mounting surface 2a.

As shown in FIG. 2, a rotary transformer 8 is provided on a surface facing the rotating drum 2 and the fixed drum 3. Here, when the upper portion of the fixed drum 3 is referred to as an upper drum 3a, a rotor-side coil is provided on an inner peripheral side of a cylindrical portion formed above the rotary drum 2, and a stator-side coil is provided on an outer peripheral side of the upper drum 3a. Have been. The upper end surface of the relay terminal pin 14 is connected to a rotor-side coil of the rotary transformer 8. Then, a recording signal is supplied to the magnetic head 1 or a reproduction signal is extracted from the magnetic head 1 by electromagnetic coupling between the rotor side coil and the stator side coil.

This will be described in more detail with reference to FIG. The relay terminal plate 1c is fixed to the lower surface of the head base 1e, and the winding 1b of the head core 1a is soldered to four lands 1f formed on the relay terminal plate 1c. These lands 1f are connected to lands 1d formed at four corners of the head base 1e. FIG.
In the example shown in (1), the area of the land portion 1d is larger than the land portion 1f.

Since the land portion 14a of the relay terminal pin 14 is buried below the head mounting surface 2a of the magnetic head 1, a position adjusting jig is attached to the head when finely adjusting the mounting position of the magnetic head 1. It can be fixed to the surface 2a. The height of the position adjusting jig is substantially equal to the thickness of the head base 1e.
Since the mounting surface is also formed on the table, the inclination angle of the jig can be kept within a predetermined value.

After the positioning of the magnetic head 1, the land 1
The wire 9 is connected to d and the land 14a. Their lands are plated with aluminum and have a diameter of 100
The connection is made using a μmm aluminum wire 9. As a connection method, the aluminum wire 9 is gripped using a chucking jig, and the wire 9 is connected to the land 1d and the land 14a while applying ultrasonic vibration to the jig.
The connection may be made by applying ultrasonic vibration while heating. In this embodiment, the wire 9 is an aluminum wire, and the land 1d and the land 14a are aluminum-plated. However, the wire 9 may be a gold wire and the land may be gold-plated. Further, a combination of gold and aluminum may be used.

When replacing the magnetic head 1, the wire 9 is peeled off from the land 1d and the land 14a, and the screw fixing the magnetic head 1 to the rotating drum 2 is loosened. In this case, the magnetic head 1 can be easily removed because the wire 9 is thin and there is no need to pull out the relay member 15. In addition, since there is nothing in the space near the magnetic head 1, the mounting restriction of the position adjusting jig for adjusting the angle of the magnetic head 1 and adjusting the amount of protrusion is reduced. Further, since it is not necessary to insert the relay member 15 into the through hole 2b of the rotating drum 2 again after the position of the magnetic head 1 is determined, the number of steps for mounting the magnetic head 1 can be greatly reduced.

(Embodiment 2) Next, a rotary head drum device according to Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 4 is an enlarged perspective view centering on the magnetic head of the rotary head drum device according to the second embodiment.
The rotary head drum device according to the present embodiment is the same as the rotary head drum device according to Embodiment 1 except for the connection with the relay member. Therefore, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted. Further, the sectional structure of the rotary head drum device is basically the same as that shown in FIG.

In the rotary head drum device according to the present embodiment, as shown in FIG. 4, a rotary drum 2 near the magnetic head 1 is provided with a through hole 2b similar to that of the first embodiment. Then, the relay member 20 is mounted in the through hole 2b.
The relay member 20 according to the present embodiment includes a terminal plate 16, a guide 21, a relay terminal pin 22, and an L-shaped pipe 23. The guide 21 uses an insulating member to form the through hole 2b.
It is formed in a cylindrical shape so that it can be press-fitted, and its axial length is shorter than the length of the through hole 2b, and a pin hole is formed in the axial direction. The relay terminal pin 22 is a conductive pin-shaped member inserted into a pin hole of the guide 21, and one end of the relay terminal pin 22 does not protrude from the head mounting surface 2 a of the rotating drum 2 and protrudes from one end surface of the guide 21. It is attached, and the other end protrudes from the other end surface of the guide 21 and is connected to the rotor side coil. The L-shaped pipe 23 is a pipe bent into an L shape, the inner diameter of the pores of the pipe is slightly larger than the outer diameter of the relay terminal pin 22, and one end of the pipe contacts the land 1d of the relay terminal plate. The other end of the pipe is inserted into the relay terminal pin 22. In addition, the relay terminal pin 22, the guide 21, and the terminal plate 16 can also be manufactured using insert molding.

The L-shaped pipe 23 shown in FIG. 5 has an inner diameter of, for example, 0.45 mm and an outer diameter of 0.7 mm. The surface of the L-shaped pipe 23 is plated with solder, tin, or the like, and the pores of the pipe are filled with solder 25 as shown in FIG. The wire diameter of the relay terminal pin 22 is 0.35 m.
m. Land 1d formed on head base 1e
And the relay terminal pin 22 is connected by the arrow A in FIG.
The L-shaped pipe 23 is inserted in the direction of (1), one of them is put on the tip of the relay terminal 22, and the other is brought into contact with the land 1d. Next, as shown in FIG. 5B, the solder 25 is melted by using a soldering iron 26 and soldering is performed to obtain a state shown in FIG. 5C. In particular, when solder is piled on the tip of the relay terminal pin 22, by heating while pressing the hollow portion of the L-shaped pipe 23 against the solder of the relay terminal pin 22,
It is easily soldered. The other end of the L-shaped pipe 22 and the land 1d of the head base 1e may be directly soldered.

By doing so, the only place to be soldered is the L-shaped pipe 23 and no extra space is required, so that high-density mounting of components in the rotary drum 2 can be performed.

[0028]

As described above, according to the first to fourth aspects of the present invention, it is possible to realize a rotary head drum device that can easily adjust the position of the magnetic head and replace the magnetic head.

According to the fifth aspect of the present invention, the density in the rotating drum and the number of channels of the magnetic head can be increased, and the mounting of the magnetic head becomes easy.

According to the sixth aspect of the present invention, the number of connection steps by soldering the magnetic head and the rotary transformer can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of a rotary head drum device according to Embodiment 1 of the present invention.

FIG. 2 is a partially enlarged sectional view showing a structure of a magnetic head portion in the rotary head drum device of the first embodiment.

FIG. 3 is an enlarged perspective view of a main part showing a wiring state near a magnetic head in the rotary head drum device of the first embodiment.

FIG. 4 is an enlarged perspective view of a main part showing a wiring state near a magnetic head in a rotary head drum device according to a second embodiment of the present invention.

FIG. 5 is a conceptual diagram showing a method of connecting relay terminal pins in the rotary head drum device according to the second embodiment.

FIG. 6 is a cross-sectional view showing a configuration example of a conventional rotary head drum device.

FIG. 7 is an enlarged perspective view of a main part showing a wiring state near a magnetic head in a conventional rotary head drum device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 magnetic head 1a head core 1b winding 1c relay terminal plate 1d, 1f, 14a land 1e head base 2 rotating drum 2a head mounting surface 2b through hole 2c cylindrical portion 3 fixed drum 3a upper drum 4 rotating disk 6 bearing 7 fixed shaft Reference Signs List 8 rotary transformer 9 wire 10 screw 11 L-shaped pipe 12, 21 guide 14, 22 relay terminal pin 16 terminal plate 20 relay member 23 L-shaped pin 25 solder 26 soldering iron

Claims (6)

[Claims] A fixed drum provided with a lead for guiding winding of a magnetic tape and a driving coil for generating a rotating magnetic field; a fixed drum rotatably held coaxially with a center axis of the fixed drum;
A rotating disk on which a magnet is fixed at a position facing the drive coil; a rotating drum formed in a cup shape so as to perform helical scanning of the magnetic tape during rotation, and rotating integrally with the rotating disk; A rotary transformer mounted at a position facing the drum, for inputting and outputting signals by electromagnetic coupling; a plurality of magnetic heads mounted on a head mounting surface formed in a radial direction of the rotary drum; A plurality of through holes provided in the vicinity and penetrating from the head mounting surface of the rotary drum to the back surface thereof; and a relay member inserted into the through hole and connecting a winding of the magnetic head and the rotary transformer. Wherein the magnetic head has a winding for recording or reproduction wound therearound. A head core, a head base mounted on the head mounting surface of the rotary drum so as to be finely adjustable, and holding the head core on an upper surface; and a head base fixed to the lower surface of the head base, for connecting windings of the head core and metal wires. And a relay terminal plate having a plurality of lands formed therein. The relay member is press-fitted into the through hole using an insulating member, and has an axial length of the through hole. A guide shorter than the length and having a pin hole formed in the axial direction; and a conductive rod-shaped member inserted into the pin hole of the guide so as not to protrude from the head mounting surface, one end of which is connected to the metal wire. A rotary head drum device, comprising: a relay terminal pin connected to a land of the relay terminal plate and the other end connected to the rotary transformer. 2. The rotary head drum device according to claim 1, wherein a connection surface of a land formed on the relay terminal plate is formed of gold or aluminum. 3. The connection surface of the relay terminal pin is made of gold or aluminum.
The rotary head drum device as described in the above. 4. The method according to claim 1, wherein when connecting a land formed on the relay terminal plate and a connection surface of the relay terminal pin with a metal wire, the connection is performed by ultrasonic vibration or heating. Rotary head drum device. 5. A fixed drum provided with a lead for guiding winding of a magnetic tape and a drive coil for generating a rotating magnetic field; and a rotatably held coaxially with a center axis of the fixed drum;
A rotating disk on which a magnet is fixed at a position facing the drive coil; a rotating drum formed in a cup shape so as to perform helical scanning of the magnetic tape during rotation, and rotating integrally with the rotating disk; A rotary transformer mounted at a position facing the drum, for inputting and outputting signals by electromagnetic coupling; a plurality of magnetic heads mounted on a head mounting surface formed in a radial direction of the rotary drum; A plurality of through holes provided in the vicinity and penetrating from the head mounting surface of the rotary drum to the back surface thereof; and a relay member inserted into the through hole and connecting a winding of the magnetic head and the rotary transformer. Wherein the magnetic head has a winding for recording or reproduction wound therearound. A head core, a head base mounted on the head mounting surface of the rotary drum so as to be finely adjustable, and holding the head core on an upper surface; and a head base fixed to the lower surface of the head base, for connecting windings of the head core and metal wires. And a relay terminal plate having a plurality of lands formed therein. The relay member is press-fitted into the through hole using an insulating member, and has an axial length of the through hole. A guide shorter than the length and having a pin hole formed in the axial direction, and a conductive pin-shaped member inserted into the pin hole of the guide so as not to protrude from the head mounting surface, one end of which is one end face of the guide And a relay terminal pin protruding from the other end surface of the guide and connected to the rotor side coil, and a pipe bent into an L-shape. The inside diameter of the pipe is slightly larger than the outside diameter of the relay terminal pin, one end of the pipe abuts a land portion of the relay terminal plate, and the other end of the pipe is an L-shaped pipe inserted into the relay terminal pin, A rotary head drum device characterized by having: 6. An end of the L-shaped pipe whose central portion is pre-filled with solder is brought into contact with a land of the relay terminal plate and soldered, and the other end of the L-shaped pipe is connected to the relay terminal. 6. The rotary head drum device according to claim 5, wherein the winding of the head core is connected to the rotary transformer by inserting the solder into a pin to melt the filled solder.